three.js/build/three.webgpu.js

/**
 * @license
 * Copyright 2010-2024 Three.js Authors
 * SPDX-License-Identifier: MIT
 */
const REVISION = '167dev';

const MOUSE = { LEFT: 0, MIDDLE: 1, RIGHT: 2, ROTATE: 0, DOLLY: 1, PAN: 2 };
const TOUCH = { ROTATE: 0, PAN: 1, DOLLY_PAN: 2, DOLLY_ROTATE: 3 };
const CullFaceNone = 0;
const CullFaceBack = 1;
const CullFaceFront = 2;
const CullFaceFrontBack = 3;
const BasicShadowMap = 0;
const PCFShadowMap = 1;
const PCFSoftShadowMap = 2;
const VSMShadowMap = 3;
const FrontSide = 0;
const BackSide = 1;
const DoubleSide = 2;
const NoBlending = 0;
const NormalBlending = 1;
const AdditiveBlending = 2;
const SubtractiveBlending = 3;
const MultiplyBlending = 4;
const CustomBlending = 5;
const AddEquation = 100;
const SubtractEquation = 101;
const ReverseSubtractEquation = 102;
const MinEquation = 103;
const MaxEquation = 104;
const ZeroFactor = 200;
const OneFactor = 201;
const SrcColorFactor = 202;
const OneMinusSrcColorFactor = 203;
const SrcAlphaFactor = 204;
const OneMinusSrcAlphaFactor = 205;
const DstAlphaFactor = 206;
const OneMinusDstAlphaFactor = 207;
const DstColorFactor = 208;
const OneMinusDstColorFactor = 209;
const SrcAlphaSaturateFactor = 210;
const ConstantColorFactor = 211;
const OneMinusConstantColorFactor = 212;
const ConstantAlphaFactor = 213;
const OneMinusConstantAlphaFactor = 214;
const NeverDepth = 0;
const AlwaysDepth = 1;
const LessDepth = 2;
const LessEqualDepth = 3;
const EqualDepth = 4;
const GreaterEqualDepth = 5;
const GreaterDepth = 6;
const NotEqualDepth = 7;
const MultiplyOperation = 0;
const MixOperation = 1;
const AddOperation = 2;
const NoToneMapping = 0;
const LinearToneMapping = 1;
const ReinhardToneMapping = 2;
const CineonToneMapping = 3;
const ACESFilmicToneMapping = 4;
const CustomToneMapping = 5;
const AgXToneMapping = 6;
const NeutralToneMapping = 7;
const AttachedBindMode = 'attached';
const DetachedBindMode = 'detached';

const UVMapping = 300;
const CubeReflectionMapping = 301;
const CubeRefractionMapping = 302;
const EquirectangularReflectionMapping = 303;
const EquirectangularRefractionMapping = 304;
const CubeUVReflectionMapping = 306;
const RepeatWrapping = 1000;
const ClampToEdgeWrapping = 1001;
const MirroredRepeatWrapping = 1002;
const NearestFilter = 1003;
const NearestMipmapNearestFilter = 1004;
const NearestMipMapNearestFilter = 1004;
const NearestMipmapLinearFilter = 1005;
const NearestMipMapLinearFilter = 1005;
const LinearFilter = 1006;
const LinearMipmapNearestFilter = 1007;
const LinearMipMapNearestFilter = 1007;
const LinearMipmapLinearFilter = 1008;
const LinearMipMapLinearFilter = 1008;
const UnsignedByteType = 1009;
const ByteType = 1010;
const ShortType = 1011;
const UnsignedShortType = 1012;
const IntType = 1013;
const UnsignedIntType = 1014;
const FloatType = 1015;
const HalfFloatType = 1016;
const UnsignedShort4444Type = 1017;
const UnsignedShort5551Type = 1018;
const UnsignedInt248Type = 1020;
const UnsignedInt5999Type = 35902;
const AlphaFormat = 1021;
const RGBFormat = 1022;
const RGBAFormat = 1023;
const LuminanceFormat = 1024;
const LuminanceAlphaFormat = 1025;
const DepthFormat = 1026;
const DepthStencilFormat = 1027;
const RedFormat = 1028;
const RedIntegerFormat = 1029;
const RGFormat = 1030;
const RGIntegerFormat = 1031;
const RGBIntegerFormat = 1032;
const RGBAIntegerFormat = 1033;

const RGB_S3TC_DXT1_Format = 33776;
const RGBA_S3TC_DXT1_Format = 33777;
const RGBA_S3TC_DXT3_Format = 33778;
const RGBA_S3TC_DXT5_Format = 33779;
const RGB_PVRTC_4BPPV1_Format = 35840;
const RGB_PVRTC_2BPPV1_Format = 35841;
const RGBA_PVRTC_4BPPV1_Format = 35842;
const RGBA_PVRTC_2BPPV1_Format = 35843;
const RGB_ETC1_Format = 36196;
const RGB_ETC2_Format = 37492;
const RGBA_ETC2_EAC_Format = 37496;
const RGBA_ASTC_4x4_Format = 37808;
const RGBA_ASTC_5x4_Format = 37809;
const RGBA_ASTC_5x5_Format = 37810;
const RGBA_ASTC_6x5_Format = 37811;
const RGBA_ASTC_6x6_Format = 37812;
const RGBA_ASTC_8x5_Format = 37813;
const RGBA_ASTC_8x6_Format = 37814;
const RGBA_ASTC_8x8_Format = 37815;
const RGBA_ASTC_10x5_Format = 37816;
const RGBA_ASTC_10x6_Format = 37817;
const RGBA_ASTC_10x8_Format = 37818;
const RGBA_ASTC_10x10_Format = 37819;
const RGBA_ASTC_12x10_Format = 37820;
const RGBA_ASTC_12x12_Format = 37821;
const RGBA_BPTC_Format = 36492;
const RGB_BPTC_SIGNED_Format = 36494;
const RGB_BPTC_UNSIGNED_Format = 36495;
const RED_RGTC1_Format = 36283;
const SIGNED_RED_RGTC1_Format = 36284;
const RED_GREEN_RGTC2_Format = 36285;
const SIGNED_RED_GREEN_RGTC2_Format = 36286;
const LoopOnce = 2200;
const LoopRepeat = 2201;
const LoopPingPong = 2202;
const InterpolateDiscrete = 2300;
const InterpolateLinear = 2301;
const InterpolateSmooth = 2302;
const ZeroCurvatureEnding = 2400;
const ZeroSlopeEnding = 2401;
const WrapAroundEnding = 2402;
const NormalAnimationBlendMode = 2500;
const AdditiveAnimationBlendMode = 2501;
const TrianglesDrawMode = 0;
const TriangleStripDrawMode = 1;
const TriangleFanDrawMode = 2;
const BasicDepthPacking = 3200;
const RGBADepthPacking = 3201;
const RGBDepthPacking = 3202;
const RGDepthPacking = 3203;
const TangentSpaceNormalMap = 0;
const ObjectSpaceNormalMap = 1;

// Color space string identifiers, matching CSS Color Module Level 4 and WebGPU names where available.
const NoColorSpace = '';
const SRGBColorSpace = 'srgb';
const LinearSRGBColorSpace = 'srgb-linear';
const DisplayP3ColorSpace = 'display-p3';
const LinearDisplayP3ColorSpace = 'display-p3-linear';

const LinearTransfer = 'linear';
const SRGBTransfer = 'srgb';

const Rec709Primaries = 'rec709';
const P3Primaries = 'p3';

const ZeroStencilOp = 0;
const KeepStencilOp = 7680;
const ReplaceStencilOp = 7681;
const IncrementStencilOp = 7682;
const DecrementStencilOp = 7683;
const IncrementWrapStencilOp = 34055;
const DecrementWrapStencilOp = 34056;
const InvertStencilOp = 5386;

const NeverStencilFunc = 512;
const LessStencilFunc = 513;
const EqualStencilFunc = 514;
const LessEqualStencilFunc = 515;
const GreaterStencilFunc = 516;
const NotEqualStencilFunc = 517;
const GreaterEqualStencilFunc = 518;
const AlwaysStencilFunc = 519;

const NeverCompare = 512;
const LessCompare = 513;
const EqualCompare = 514;
const LessEqualCompare = 515;
const GreaterCompare = 516;
const NotEqualCompare = 517;
const GreaterEqualCompare = 518;
const AlwaysCompare = 519;

const StaticDrawUsage = 35044;
const DynamicDrawUsage = 35048;
const StreamDrawUsage = 35040;
const StaticReadUsage = 35045;
const DynamicReadUsage = 35049;
const StreamReadUsage = 35041;
const StaticCopyUsage = 35046;
const DynamicCopyUsage = 35050;
const StreamCopyUsage = 35042;

const GLSL1 = '100';
const GLSL3 = '300 es';

const WebGLCoordinateSystem = 2000;
const WebGPUCoordinateSystem = 2001;

/**
 * https://github.com/mrdoob/eventdispatcher.js/
 */

class EventDispatcher {

	addEventListener( type, listener ) {

		if ( this._listeners === undefined ) this._listeners = {};

		const listeners = this._listeners;

		if ( listeners[ type ] === undefined ) {

			listeners[ type ] = [];

		}

		if ( listeners[ type ].indexOf( listener ) === - 1 ) {

			listeners[ type ].push( listener );

		}

	}

	hasEventListener( type, listener ) {

		if ( this._listeners === undefined ) return false;

		const listeners = this._listeners;

		return listeners[ type ] !== undefined && listeners[ type ].indexOf( listener ) !== - 1;

	}

	removeEventListener( type, listener ) {

		if ( this._listeners === undefined ) return;

		const listeners = this._listeners;
		const listenerArray = listeners[ type ];

		if ( listenerArray !== undefined ) {

			const index = listenerArray.indexOf( listener );

			if ( index !== - 1 ) {

				listenerArray.splice( index, 1 );

			}

		}

	}

	dispatchEvent( event ) {

		if ( this._listeners === undefined ) return;

		const listeners = this._listeners;
		const listenerArray = listeners[ event.type ];

		if ( listenerArray !== undefined ) {

			event.target = this;

			// Make a copy, in case listeners are removed while iterating.
			const array = listenerArray.slice( 0 );

			for ( let i = 0, l = array.length; i < l; i ++ ) {

				array[ i ].call( this, event );

			}

			event.target = null;

		}

	}

}

const _lut = [ '00', '01', '02', '03', '04', '05', '06', '07', '08', '09', '0a', '0b', '0c', '0d', '0e', '0f', '10', '11', '12', '13', '14', '15', '16', '17', '18', '19', '1a', '1b', '1c', '1d', '1e', '1f', '20', '21', '22', '23', '24', '25', '26', '27', '28', '29', '2a', '2b', '2c', '2d', '2e', '2f', '30', '31', '32', '33', '34', '35', '36', '37', '38', '39', '3a', '3b', '3c', '3d', '3e', '3f', '40', '41', '42', '43', '44', '45', '46', '47', '48', '49', '4a', '4b', '4c', '4d', '4e', '4f', '50', '51', '52', '53', '54', '55', '56', '57', '58', '59', '5a', '5b', '5c', '5d', '5e', '5f', '60', '61', '62', '63', '64', '65', '66', '67', '68', '69', '6a', '6b', '6c', '6d', '6e', '6f', '70', '71', '72', '73', '74', '75', '76', '77', '78', '79', '7a', '7b', '7c', '7d', '7e', '7f', '80', '81', '82', '83', '84', '85', '86', '87', '88', '89', '8a', '8b', '8c', '8d', '8e', '8f', '90', '91', '92', '93', '94', '95', '96', '97', '98', '99', '9a', '9b', '9c', '9d', '9e', '9f', 'a0', 'a1', 'a2', 'a3', 'a4', 'a5', 'a6', 'a7', 'a8', 'a9', 'aa', 'ab', 'ac', 'ad', 'ae', 'af', 'b0', 'b1', 'b2', 'b3', 'b4', 'b5', 'b6', 'b7', 'b8', 'b9', 'ba', 'bb', 'bc', 'bd', 'be', 'bf', 'c0', 'c1', 'c2', 'c3', 'c4', 'c5', 'c6', 'c7', 'c8', 'c9', 'ca', 'cb', 'cc', 'cd', 'ce', 'cf', 'd0', 'd1', 'd2', 'd3', 'd4', 'd5', 'd6', 'd7', 'd8', 'd9', 'da', 'db', 'dc', 'dd', 'de', 'df', 'e0', 'e1', 'e2', 'e3', 'e4', 'e5', 'e6', 'e7', 'e8', 'e9', 'ea', 'eb', 'ec', 'ed', 'ee', 'ef', 'f0', 'f1', 'f2', 'f3', 'f4', 'f5', 'f6', 'f7', 'f8', 'f9', 'fa', 'fb', 'fc', 'fd', 'fe', 'ff' ];

let _seed = 1234567;


const DEG2RAD = Math.PI / 180;
const RAD2DEG = 180 / Math.PI;

// http://stackoverflow.com/questions/105034/how-to-create-a-guid-uuid-in-javascript/21963136#21963136
function generateUUID() {

	const d0 = Math.random() * 0xffffffff | 0;
	const d1 = Math.random() * 0xffffffff | 0;
	const d2 = Math.random() * 0xffffffff | 0;
	const d3 = Math.random() * 0xffffffff | 0;
	const uuid = _lut[ d0 & 0xff ] + _lut[ d0 >> 8 & 0xff ] + _lut[ d0 >> 16 & 0xff ] + _lut[ d0 >> 24 & 0xff ] + '-' +
			_lut[ d1 & 0xff ] + _lut[ d1 >> 8 & 0xff ] + '-' + _lut[ d1 >> 16 & 0x0f | 0x40 ] + _lut[ d1 >> 24 & 0xff ] + '-' +
			_lut[ d2 & 0x3f | 0x80 ] + _lut[ d2 >> 8 & 0xff ] + '-' + _lut[ d2 >> 16 & 0xff ] + _lut[ d2 >> 24 & 0xff ] +
			_lut[ d3 & 0xff ] + _lut[ d3 >> 8 & 0xff ] + _lut[ d3 >> 16 & 0xff ] + _lut[ d3 >> 24 & 0xff ];

	// .toLowerCase() here flattens concatenated strings to save heap memory space.
	return uuid.toLowerCase();

}

function clamp$1( value, min, max ) {

	return Math.max( min, Math.min( max, value ) );

}

// compute euclidean modulo of m % n
// https://en.wikipedia.org/wiki/Modulo_operation
function euclideanModulo( n, m ) {

	return ( ( n % m ) + m ) % m;

}

// Linear mapping from range <a1, a2> to range <b1, b2>
function mapLinear( x, a1, a2, b1, b2 ) {

	return b1 + ( x - a1 ) * ( b2 - b1 ) / ( a2 - a1 );

}

// https://www.gamedev.net/tutorials/programming/general-and-gameplay-programming/inverse-lerp-a-super-useful-yet-often-overlooked-function-r5230/
function inverseLerp( x, y, value ) {

	if ( x !== y ) {

		return ( value - x ) / ( y - x );

	} else {

		return 0;

	}

}

// https://en.wikipedia.org/wiki/Linear_interpolation
function lerp( x, y, t ) {

	return ( 1 - t ) * x + t * y;

}

// http://www.rorydriscoll.com/2016/03/07/frame-rate-independent-damping-using-lerp/
function damp( x, y, lambda, dt ) {

	return lerp( x, y, 1 - Math.exp( - lambda * dt ) );

}

// https://www.desmos.com/calculator/vcsjnyz7x4
function pingpong( x, length = 1 ) {

	return length - Math.abs( euclideanModulo( x, length * 2 ) - length );

}

// http://en.wikipedia.org/wiki/Smoothstep
function smoothstep$1( x, min, max ) {

	if ( x <= min ) return 0;
	if ( x >= max ) return 1;

	x = ( x - min ) / ( max - min );

	return x * x * ( 3 - 2 * x );

}

function smootherstep( x, min, max ) {

	if ( x <= min ) return 0;
	if ( x >= max ) return 1;

	x = ( x - min ) / ( max - min );

	return x * x * x * ( x * ( x * 6 - 15 ) + 10 );

}

// Random integer from <low, high> interval
function randInt( low, high ) {

	return low + Math.floor( Math.random() * ( high - low + 1 ) );

}

// Random float from <low, high> interval
function randFloat( low, high ) {

	return low + Math.random() * ( high - low );

}

// Random float from <-range/2, range/2> interval
function randFloatSpread( range ) {

	return range * ( 0.5 - Math.random() );

}

// Deterministic pseudo-random float in the interval [ 0, 1 ]
function seededRandom( s ) {

	if ( s !== undefined ) _seed = s;

	// Mulberry32 generator

	let t = _seed += 0x6D2B79F5;

	t = Math.imul( t ^ t >>> 15, t | 1 );

	t ^= t + Math.imul( t ^ t >>> 7, t | 61 );

	return ( ( t ^ t >>> 14 ) >>> 0 ) / 4294967296;

}

function degToRad( degrees ) {

	return degrees * DEG2RAD;

}

function radToDeg( radians ) {

	return radians * RAD2DEG;

}

function isPowerOfTwo( value ) {

	return ( value & ( value - 1 ) ) === 0 && value !== 0;

}

function ceilPowerOfTwo( value ) {

	return Math.pow( 2, Math.ceil( Math.log( value ) / Math.LN2 ) );

}

function floorPowerOfTwo( value ) {

	return Math.pow( 2, Math.floor( Math.log( value ) / Math.LN2 ) );

}

function setQuaternionFromProperEuler( q, a, b, c, order ) {

	// Intrinsic Proper Euler Angles - see https://en.wikipedia.org/wiki/Euler_angles

	// rotations are applied to the axes in the order specified by 'order'
	// rotation by angle 'a' is applied first, then by angle 'b', then by angle 'c'
	// angles are in radians

	const cos = Math.cos;
	const sin = Math.sin;

	const c2 = cos( b / 2 );
	const s2 = sin( b / 2 );

	const c13 = cos( ( a + c ) / 2 );
	const s13 = sin( ( a + c ) / 2 );

	const c1_3 = cos( ( a - c ) / 2 );
	const s1_3 = sin( ( a - c ) / 2 );

	const c3_1 = cos( ( c - a ) / 2 );
	const s3_1 = sin( ( c - a ) / 2 );

	switch ( order ) {

		case 'XYX':
			q.set( c2 * s13, s2 * c1_3, s2 * s1_3, c2 * c13 );
			break;

		case 'YZY':
			q.set( s2 * s1_3, c2 * s13, s2 * c1_3, c2 * c13 );
			break;

		case 'ZXZ':
			q.set( s2 * c1_3, s2 * s1_3, c2 * s13, c2 * c13 );
			break;

		case 'XZX':
			q.set( c2 * s13, s2 * s3_1, s2 * c3_1, c2 * c13 );
			break;

		case 'YXY':
			q.set( s2 * c3_1, c2 * s13, s2 * s3_1, c2 * c13 );
			break;

		case 'ZYZ':
			q.set( s2 * s3_1, s2 * c3_1, c2 * s13, c2 * c13 );
			break;

		default:
			console.warn( 'THREE.MathUtils: .setQuaternionFromProperEuler() encountered an unknown order: ' + order );

	}

}

function denormalize( value, array ) {

	switch ( array.constructor ) {

		case Float32Array:

			return value;

		case Uint32Array:

			return value / 4294967295.0;

		case Uint16Array:

			return value / 65535.0;

		case Uint8Array:

			return value / 255.0;

		case Int32Array:

			return Math.max( value / 2147483647.0, - 1.0 );

		case Int16Array:

			return Math.max( value / 32767.0, - 1.0 );

		case Int8Array:

			return Math.max( value / 127.0, - 1.0 );

		default:

			throw new Error( 'Invalid component type.' );

	}

}

function normalize$1( value, array ) {

	switch ( array.constructor ) {

		case Float32Array:

			return value;

		case Uint32Array:

			return Math.round( value * 4294967295.0 );

		case Uint16Array:

			return Math.round( value * 65535.0 );

		case Uint8Array:

			return Math.round( value * 255.0 );

		case Int32Array:

			return Math.round( value * 2147483647.0 );

		case Int16Array:

			return Math.round( value * 32767.0 );

		case Int8Array:

			return Math.round( value * 127.0 );

		default:

			throw new Error( 'Invalid component type.' );

	}

}

const MathUtils = {
	DEG2RAD: DEG2RAD,
	RAD2DEG: RAD2DEG,
	generateUUID: generateUUID,
	clamp: clamp$1,
	euclideanModulo: euclideanModulo,
	mapLinear: mapLinear,
	inverseLerp: inverseLerp,
	lerp: lerp,
	damp: damp,
	pingpong: pingpong,
	smoothstep: smoothstep$1,
	smootherstep: smootherstep,
	randInt: randInt,
	randFloat: randFloat,
	randFloatSpread: randFloatSpread,
	seededRandom: seededRandom,
	degToRad: degToRad,
	radToDeg: radToDeg,
	isPowerOfTwo: isPowerOfTwo,
	ceilPowerOfTwo: ceilPowerOfTwo,
	floorPowerOfTwo: floorPowerOfTwo,
	setQuaternionFromProperEuler: setQuaternionFromProperEuler,
	normalize: normalize$1,
	denormalize: denormalize
};

class Vector2 {

	constructor( x = 0, y = 0 ) {

		Vector2.prototype.isVector2 = true;

		this.x = x;
		this.y = y;

	}

	get width() {

		return this.x;

	}

	set width( value ) {

		this.x = value;

	}

	get height() {

		return this.y;

	}

	set height( value ) {

		this.y = value;

	}

	set( x, y ) {

		this.x = x;
		this.y = y;

		return this;

	}

	setScalar( scalar ) {

		this.x = scalar;
		this.y = scalar;

		return this;

	}

	setX( x ) {

		this.x = x;

		return this;

	}

	setY( y ) {

		this.y = y;

		return this;

	}

	setComponent( index, value ) {

		switch ( index ) {

			case 0: this.x = value; break;
			case 1: this.y = value; break;
			default: throw new Error( 'index is out of range: ' + index );

		}

		return this;

	}

	getComponent( index ) {

		switch ( index ) {

			case 0: return this.x;
			case 1: return this.y;
			default: throw new Error( 'index is out of range: ' + index );

		}

	}

	clone() {

		return new this.constructor( this.x, this.y );

	}

	copy( v ) {

		this.x = v.x;
		this.y = v.y;

		return this;

	}

	add( v ) {

		this.x += v.x;
		this.y += v.y;

		return this;

	}

	addScalar( s ) {

		this.x += s;
		this.y += s;

		return this;

	}

	addVectors( a, b ) {

		this.x = a.x + b.x;
		this.y = a.y + b.y;

		return this;

	}

	addScaledVector( v, s ) {

		this.x += v.x * s;
		this.y += v.y * s;

		return this;

	}

	sub( v ) {

		this.x -= v.x;
		this.y -= v.y;

		return this;

	}

	subScalar( s ) {

		this.x -= s;
		this.y -= s;

		return this;

	}

	subVectors( a, b ) {

		this.x = a.x - b.x;
		this.y = a.y - b.y;

		return this;

	}

	multiply( v ) {

		this.x *= v.x;
		this.y *= v.y;

		return this;

	}

	multiplyScalar( scalar ) {

		this.x *= scalar;
		this.y *= scalar;

		return this;

	}

	divide( v ) {

		this.x /= v.x;
		this.y /= v.y;

		return this;

	}

	divideScalar( scalar ) {

		return this.multiplyScalar( 1 / scalar );

	}

	applyMatrix3( m ) {

		const x = this.x, y = this.y;
		const e = m.elements;

		this.x = e[ 0 ] * x + e[ 3 ] * y + e[ 6 ];
		this.y = e[ 1 ] * x + e[ 4 ] * y + e[ 7 ];

		return this;

	}

	min( v ) {

		this.x = Math.min( this.x, v.x );
		this.y = Math.min( this.y, v.y );

		return this;

	}

	max( v ) {

		this.x = Math.max( this.x, v.x );
		this.y = Math.max( this.y, v.y );

		return this;

	}

	clamp( min, max ) {

		// assumes min < max, componentwise

		this.x = Math.max( min.x, Math.min( max.x, this.x ) );
		this.y = Math.max( min.y, Math.min( max.y, this.y ) );

		return this;

	}

	clampScalar( minVal, maxVal ) {

		this.x = Math.max( minVal, Math.min( maxVal, this.x ) );
		this.y = Math.max( minVal, Math.min( maxVal, this.y ) );

		return this;

	}

	clampLength( min, max ) {

		const length = this.length();

		return this.divideScalar( length || 1 ).multiplyScalar( Math.max( min, Math.min( max, length ) ) );

	}

	floor() {

		this.x = Math.floor( this.x );
		this.y = Math.floor( this.y );

		return this;

	}

	ceil() {

		this.x = Math.ceil( this.x );
		this.y = Math.ceil( this.y );

		return this;

	}

	round() {

		this.x = Math.round( this.x );
		this.y = Math.round( this.y );

		return this;

	}

	roundToZero() {

		this.x = Math.trunc( this.x );
		this.y = Math.trunc( this.y );

		return this;

	}

	negate() {

		this.x = - this.x;
		this.y = - this.y;

		return this;

	}

	dot( v ) {

		return this.x * v.x + this.y * v.y;

	}

	cross( v ) {

		return this.x * v.y - this.y * v.x;

	}

	lengthSq() {

		return this.x * this.x + this.y * this.y;

	}

	length() {

		return Math.sqrt( this.x * this.x + this.y * this.y );

	}

	manhattanLength() {

		return Math.abs( this.x ) + Math.abs( this.y );

	}

	normalize() {

		return this.divideScalar( this.length() || 1 );

	}

	angle() {

		// computes the angle in radians with respect to the positive x-axis

		const angle = Math.atan2( - this.y, - this.x ) + Math.PI;

		return angle;

	}

	angleTo( v ) {

		const denominator = Math.sqrt( this.lengthSq() * v.lengthSq() );

		if ( denominator === 0 ) return Math.PI / 2;

		const theta = this.dot( v ) / denominator;

		// clamp, to handle numerical problems

		return Math.acos( clamp$1( theta, - 1, 1 ) );

	}

	distanceTo( v ) {

		return Math.sqrt( this.distanceToSquared( v ) );

	}

	distanceToSquared( v ) {

		const dx = this.x - v.x, dy = this.y - v.y;
		return dx * dx + dy * dy;

	}

	manhattanDistanceTo( v ) {

		return Math.abs( this.x - v.x ) + Math.abs( this.y - v.y );

	}

	setLength( length ) {

		return this.normalize().multiplyScalar( length );

	}

	lerp( v, alpha ) {

		this.x += ( v.x - this.x ) * alpha;
		this.y += ( v.y - this.y ) * alpha;

		return this;

	}

	lerpVectors( v1, v2, alpha ) {

		this.x = v1.x + ( v2.x - v1.x ) * alpha;
		this.y = v1.y + ( v2.y - v1.y ) * alpha;

		return this;

	}

	equals( v ) {

		return ( ( v.x === this.x ) && ( v.y === this.y ) );

	}

	fromArray( array, offset = 0 ) {

		this.x = array[ offset ];
		this.y = array[ offset + 1 ];

		return this;

	}

	toArray( array = [], offset = 0 ) {

		array[ offset ] = this.x;
		array[ offset + 1 ] = this.y;

		return array;

	}

	fromBufferAttribute( attribute, index ) {

		this.x = attribute.getX( index );
		this.y = attribute.getY( index );

		return this;

	}

	rotateAround( center, angle ) {

		const c = Math.cos( angle ), s = Math.sin( angle );

		const x = this.x - center.x;
		const y = this.y - center.y;

		this.x = x * c - y * s + center.x;
		this.y = x * s + y * c + center.y;

		return this;

	}

	random() {

		this.x = Math.random();
		this.y = Math.random();

		return this;

	}

	*[ Symbol.iterator ]() {

		yield this.x;
		yield this.y;

	}

}

class Matrix3 {

	constructor( n11, n12, n13, n21, n22, n23, n31, n32, n33 ) {

		Matrix3.prototype.isMatrix3 = true;

		this.elements = [

			1, 0, 0,
			0, 1, 0,
			0, 0, 1

		];

		if ( n11 !== undefined ) {

			this.set( n11, n12, n13, n21, n22, n23, n31, n32, n33 );

		}

	}

	set( n11, n12, n13, n21, n22, n23, n31, n32, n33 ) {

		const te = this.elements;

		te[ 0 ] = n11; te[ 1 ] = n21; te[ 2 ] = n31;
		te[ 3 ] = n12; te[ 4 ] = n22; te[ 5 ] = n32;
		te[ 6 ] = n13; te[ 7 ] = n23; te[ 8 ] = n33;

		return this;

	}

	identity() {

		this.set(

			1, 0, 0,
			0, 1, 0,
			0, 0, 1

		);

		return this;

	}

	copy( m ) {

		const te = this.elements;
		const me = m.elements;

		te[ 0 ] = me[ 0 ]; te[ 1 ] = me[ 1 ]; te[ 2 ] = me[ 2 ];
		te[ 3 ] = me[ 3 ]; te[ 4 ] = me[ 4 ]; te[ 5 ] = me[ 5 ];
		te[ 6 ] = me[ 6 ]; te[ 7 ] = me[ 7 ]; te[ 8 ] = me[ 8 ];

		return this;

	}

	extractBasis( xAxis, yAxis, zAxis ) {

		xAxis.setFromMatrix3Column( this, 0 );
		yAxis.setFromMatrix3Column( this, 1 );
		zAxis.setFromMatrix3Column( this, 2 );

		return this;

	}

	setFromMatrix4( m ) {

		const me = m.elements;

		this.set(

			me[ 0 ], me[ 4 ], me[ 8 ],
			me[ 1 ], me[ 5 ], me[ 9 ],
			me[ 2 ], me[ 6 ], me[ 10 ]

		);

		return this;

	}

	multiply( m ) {

		return this.multiplyMatrices( this, m );

	}

	premultiply( m ) {

		return this.multiplyMatrices( m, this );

	}

	multiplyMatrices( a, b ) {

		const ae = a.elements;
		const be = b.elements;
		const te = this.elements;

		const a11 = ae[ 0 ], a12 = ae[ 3 ], a13 = ae[ 6 ];
		const a21 = ae[ 1 ], a22 = ae[ 4 ], a23 = ae[ 7 ];
		const a31 = ae[ 2 ], a32 = ae[ 5 ], a33 = ae[ 8 ];

		const b11 = be[ 0 ], b12 = be[ 3 ], b13 = be[ 6 ];
		const b21 = be[ 1 ], b22 = be[ 4 ], b23 = be[ 7 ];
		const b31 = be[ 2 ], b32 = be[ 5 ], b33 = be[ 8 ];

		te[ 0 ] = a11 * b11 + a12 * b21 + a13 * b31;
		te[ 3 ] = a11 * b12 + a12 * b22 + a13 * b32;
		te[ 6 ] = a11 * b13 + a12 * b23 + a13 * b33;

		te[ 1 ] = a21 * b11 + a22 * b21 + a23 * b31;
		te[ 4 ] = a21 * b12 + a22 * b22 + a23 * b32;
		te[ 7 ] = a21 * b13 + a22 * b23 + a23 * b33;

		te[ 2 ] = a31 * b11 + a32 * b21 + a33 * b31;
		te[ 5 ] = a31 * b12 + a32 * b22 + a33 * b32;
		te[ 8 ] = a31 * b13 + a32 * b23 + a33 * b33;

		return this;

	}

	multiplyScalar( s ) {

		const te = this.elements;

		te[ 0 ] *= s; te[ 3 ] *= s; te[ 6 ] *= s;
		te[ 1 ] *= s; te[ 4 ] *= s; te[ 7 ] *= s;
		te[ 2 ] *= s; te[ 5 ] *= s; te[ 8 ] *= s;

		return this;

	}

	determinant() {

		const te = this.elements;

		const a = te[ 0 ], b = te[ 1 ], c = te[ 2 ],
			d = te[ 3 ], e = te[ 4 ], f = te[ 5 ],
			g = te[ 6 ], h = te[ 7 ], i = te[ 8 ];

		return a * e * i - a * f * h - b * d * i + b * f * g + c * d * h - c * e * g;

	}

	invert() {

		const te = this.elements,

			n11 = te[ 0 ], n21 = te[ 1 ], n31 = te[ 2 ],
			n12 = te[ 3 ], n22 = te[ 4 ], n32 = te[ 5 ],
			n13 = te[ 6 ], n23 = te[ 7 ], n33 = te[ 8 ],

			t11 = n33 * n22 - n32 * n23,
			t12 = n32 * n13 - n33 * n12,
			t13 = n23 * n12 - n22 * n13,

			det = n11 * t11 + n21 * t12 + n31 * t13;

		if ( det === 0 ) return this.set( 0, 0, 0, 0, 0, 0, 0, 0, 0 );

		const detInv = 1 / det;

		te[ 0 ] = t11 * detInv;
		te[ 1 ] = ( n31 * n23 - n33 * n21 ) * detInv;
		te[ 2 ] = ( n32 * n21 - n31 * n22 ) * detInv;

		te[ 3 ] = t12 * detInv;
		te[ 4 ] = ( n33 * n11 - n31 * n13 ) * detInv;
		te[ 5 ] = ( n31 * n12 - n32 * n11 ) * detInv;

		te[ 6 ] = t13 * detInv;
		te[ 7 ] = ( n21 * n13 - n23 * n11 ) * detInv;
		te[ 8 ] = ( n22 * n11 - n21 * n12 ) * detInv;

		return this;

	}

	transpose() {

		let tmp;
		const m = this.elements;

		tmp = m[ 1 ]; m[ 1 ] = m[ 3 ]; m[ 3 ] = tmp;
		tmp = m[ 2 ]; m[ 2 ] = m[ 6 ]; m[ 6 ] = tmp;
		tmp = m[ 5 ]; m[ 5 ] = m[ 7 ]; m[ 7 ] = tmp;

		return this;

	}

	getNormalMatrix( matrix4 ) {

		return this.setFromMatrix4( matrix4 ).invert().transpose();

	}

	transposeIntoArray( r ) {

		const m = this.elements;

		r[ 0 ] = m[ 0 ];
		r[ 1 ] = m[ 3 ];
		r[ 2 ] = m[ 6 ];
		r[ 3 ] = m[ 1 ];
		r[ 4 ] = m[ 4 ];
		r[ 5 ] = m[ 7 ];
		r[ 6 ] = m[ 2 ];
		r[ 7 ] = m[ 5 ];
		r[ 8 ] = m[ 8 ];

		return this;

	}

	setUvTransform( tx, ty, sx, sy, rotation, cx, cy ) {

		const c = Math.cos( rotation );
		const s = Math.sin( rotation );

		this.set(
			sx * c, sx * s, - sx * ( c * cx + s * cy ) + cx + tx,
			- sy * s, sy * c, - sy * ( - s * cx + c * cy ) + cy + ty,
			0, 0, 1
		);

		return this;

	}

	//

	scale( sx, sy ) {

		this.premultiply( _m3.makeScale( sx, sy ) );

		return this;

	}

	rotate( theta ) {

		this.premultiply( _m3.makeRotation( - theta ) );

		return this;

	}

	translate( tx, ty ) {

		this.premultiply( _m3.makeTranslation( tx, ty ) );

		return this;

	}

	// for 2D Transforms

	makeTranslation( x, y ) {

		if ( x.isVector2 ) {

			this.set(

				1, 0, x.x,
				0, 1, x.y,
				0, 0, 1

			);

		} else {

			this.set(

				1, 0, x,
				0, 1, y,
				0, 0, 1

			);

		}

		return this;

	}

	makeRotation( theta ) {

		// counterclockwise

		const c = Math.cos( theta );
		const s = Math.sin( theta );

		this.set(

			c, - s, 0,
			s, c, 0,
			0, 0, 1

		);

		return this;

	}

	makeScale( x, y ) {

		this.set(

			x, 0, 0,
			0, y, 0,
			0, 0, 1

		);

		return this;

	}

	//

	equals( matrix ) {

		const te = this.elements;
		const me = matrix.elements;

		for ( let i = 0; i < 9; i ++ ) {

			if ( te[ i ] !== me[ i ] ) return false;

		}

		return true;

	}

	fromArray( array, offset = 0 ) {

		for ( let i = 0; i < 9; i ++ ) {

			this.elements[ i ] = array[ i + offset ];

		}

		return this;

	}

	toArray( array = [], offset = 0 ) {

		const te = this.elements;

		array[ offset ] = te[ 0 ];
		array[ offset + 1 ] = te[ 1 ];
		array[ offset + 2 ] = te[ 2 ];

		array[ offset + 3 ] = te[ 3 ];
		array[ offset + 4 ] = te[ 4 ];
		array[ offset + 5 ] = te[ 5 ];

		array[ offset + 6 ] = te[ 6 ];
		array[ offset + 7 ] = te[ 7 ];
		array[ offset + 8 ] = te[ 8 ];

		return array;

	}

	clone() {

		return new this.constructor().fromArray( this.elements );

	}

}

const _m3 = /*@__PURE__*/ new Matrix3();

function arrayNeedsUint32$1( array ) {

	// assumes larger values usually on last

	for ( let i = array.length - 1; i >= 0; -- i ) {

		if ( array[ i ] >= 65535 ) return true; // account for PRIMITIVE_RESTART_FIXED_INDEX, #24565

	}

	return false;

}

const TYPED_ARRAYS = {
	Int8Array: Int8Array,
	Uint8Array: Uint8Array,
	Uint8ClampedArray: Uint8ClampedArray,
	Int16Array: Int16Array,
	Uint16Array: Uint16Array,
	Int32Array: Int32Array,
	Uint32Array: Uint32Array,
	Float32Array: Float32Array,
	Float64Array: Float64Array
};

function getTypedArray( type, buffer ) {

	return new TYPED_ARRAYS[ type ]( buffer );

}

function createElementNS( name ) {

	return document.createElementNS( 'http://www.w3.org/1999/xhtml', name );

}

function createCanvasElement() {

	const canvas = createElementNS( 'canvas' );
	canvas.style.display = 'block';
	return canvas;

}

const _cache$1 = {};

function warnOnce( message ) {

	if ( message in _cache$1 ) return;

	_cache$1[ message ] = true;

	console.warn( message );

}

/**
 * Matrices converting P3 <-> Rec. 709 primaries, without gamut mapping
 * or clipping. Based on W3C specifications for sRGB and Display P3,
 * and ICC specifications for the D50 connection space. Values in/out
 * are _linear_ sRGB and _linear_ Display P3.
 *
 * Note that both sRGB and Display P3 use the sRGB transfer functions.
 *
 * Reference:
 * - http://www.russellcottrell.com/photo/matrixCalculator.htm
 */

const LINEAR_SRGB_TO_LINEAR_DISPLAY_P3 = /*@__PURE__*/ new Matrix3().set(
	0.8224621, 0.177538, 0.0,
	0.0331941, 0.9668058, 0.0,
	0.0170827, 0.0723974, 0.9105199,
);

const LINEAR_DISPLAY_P3_TO_LINEAR_SRGB = /*@__PURE__*/ new Matrix3().set(
	1.2249401, - 0.2249404, 0.0,
	- 0.0420569, 1.0420571, 0.0,
	- 0.0196376, - 0.0786361, 1.0982735
);

/**
 * Defines supported color spaces by transfer function and primaries,
 * and provides conversions to/from the Linear-sRGB reference space.
 */
const COLOR_SPACES = {
	[ LinearSRGBColorSpace ]: {
		transfer: LinearTransfer,
		primaries: Rec709Primaries,
		toReference: ( color ) => color,
		fromReference: ( color ) => color,
	},
	[ SRGBColorSpace ]: {
		transfer: SRGBTransfer,
		primaries: Rec709Primaries,
		toReference: ( color ) => color.convertSRGBToLinear(),
		fromReference: ( color ) => color.convertLinearToSRGB(),
	},
	[ LinearDisplayP3ColorSpace ]: {
		transfer: LinearTransfer,
		primaries: P3Primaries,
		toReference: ( color ) => color.applyMatrix3( LINEAR_DISPLAY_P3_TO_LINEAR_SRGB ),
		fromReference: ( color ) => color.applyMatrix3( LINEAR_SRGB_TO_LINEAR_DISPLAY_P3 ),
	},
	[ DisplayP3ColorSpace ]: {
		transfer: SRGBTransfer,
		primaries: P3Primaries,
		toReference: ( color ) => color.convertSRGBToLinear().applyMatrix3( LINEAR_DISPLAY_P3_TO_LINEAR_SRGB ),
		fromReference: ( color ) => color.applyMatrix3( LINEAR_SRGB_TO_LINEAR_DISPLAY_P3 ).convertLinearToSRGB(),
	},
};

const SUPPORTED_WORKING_COLOR_SPACES = new Set( [ LinearSRGBColorSpace, LinearDisplayP3ColorSpace ] );

const ColorManagement = {

	enabled: true,

	_workingColorSpace: LinearSRGBColorSpace,

	get workingColorSpace() {

		return this._workingColorSpace;

	},

	set workingColorSpace( colorSpace ) {

		if ( ! SUPPORTED_WORKING_COLOR_SPACES.has( colorSpace ) ) {

			throw new Error( `Unsupported working color space, "${ colorSpace }".` );

		}

		this._workingColorSpace = colorSpace;

	},

	convert: function ( color, sourceColorSpace, targetColorSpace ) {

		if ( this.enabled === false || sourceColorSpace === targetColorSpace || ! sourceColorSpace || ! targetColorSpace ) {

			return color;

		}

		const sourceToReference = COLOR_SPACES[ sourceColorSpace ].toReference;
		const targetFromReference = COLOR_SPACES[ targetColorSpace ].fromReference;

		return targetFromReference( sourceToReference( color ) );

	},

	fromWorkingColorSpace: function ( color, targetColorSpace ) {

		return this.convert( color, this._workingColorSpace, targetColorSpace );

	},

	toWorkingColorSpace: function ( color, sourceColorSpace ) {

		return this.convert( color, sourceColorSpace, this._workingColorSpace );

	},

	getPrimaries: function ( colorSpace ) {

		return COLOR_SPACES[ colorSpace ].primaries;

	},

	getTransfer: function ( colorSpace ) {

		if ( colorSpace === NoColorSpace ) return LinearTransfer;

		return COLOR_SPACES[ colorSpace ].transfer;

	},

};


function SRGBToLinear( c ) {

	return ( c < 0.04045 ) ? c * 0.0773993808 : Math.pow( c * 0.9478672986 + 0.0521327014, 2.4 );

}

function LinearToSRGB( c ) {

	return ( c < 0.0031308 ) ? c * 12.92 : 1.055 * ( Math.pow( c, 0.41666 ) ) - 0.055;

}

let _canvas;

class ImageUtils {

	static getDataURL( image ) {

		if ( /^data:/i.test( image.src ) ) {

			return image.src;

		}

		if ( typeof HTMLCanvasElement === 'undefined' ) {

			return image.src;

		}

		let canvas;

		if ( image instanceof HTMLCanvasElement ) {

			canvas = image;

		} else {

			if ( _canvas === undefined ) _canvas = createElementNS( 'canvas' );

			_canvas.width = image.width;
			_canvas.height = image.height;

			const context = _canvas.getContext( '2d' );

			if ( image instanceof ImageData ) {

				context.putImageData( image, 0, 0 );

			} else {

				context.drawImage( image, 0, 0, image.width, image.height );

			}

			canvas = _canvas;

		}

		if ( canvas.width > 2048 || canvas.height > 2048 ) {

			console.warn( 'THREE.ImageUtils.getDataURL: Image converted to jpg for performance reasons', image );

			return canvas.toDataURL( 'image/jpeg', 0.6 );

		} else {

			return canvas.toDataURL( 'image/png' );

		}

	}

	static sRGBToLinear( image ) {

		if ( ( typeof HTMLImageElement !== 'undefined' && image instanceof HTMLImageElement ) ||
			( typeof HTMLCanvasElement !== 'undefined' && image instanceof HTMLCanvasElement ) ||
			( typeof ImageBitmap !== 'undefined' && image instanceof ImageBitmap ) ) {

			const canvas = createElementNS( 'canvas' );

			canvas.width = image.width;
			canvas.height = image.height;

			const context = canvas.getContext( '2d' );
			context.drawImage( image, 0, 0, image.width, image.height );

			const imageData = context.getImageData( 0, 0, image.width, image.height );
			const data = imageData.data;

			for ( let i = 0; i < data.length; i ++ ) {

				data[ i ] = SRGBToLinear( data[ i ] / 255 ) * 255;

			}

			context.putImageData( imageData, 0, 0 );

			return canvas;

		} else if ( image.data ) {

			const data = image.data.slice( 0 );

			for ( let i = 0; i < data.length; i ++ ) {

				if ( data instanceof Uint8Array || data instanceof Uint8ClampedArray ) {

					data[ i ] = Math.floor( SRGBToLinear( data[ i ] / 255 ) * 255 );

				} else {

					// assuming float

					data[ i ] = SRGBToLinear( data[ i ] );

				}

			}

			return {
				data: data,
				width: image.width,
				height: image.height
			};

		} else {

			console.warn( 'THREE.ImageUtils.sRGBToLinear(): Unsupported image type. No color space conversion applied.' );
			return image;

		}

	}

}

let _sourceId = 0;

class Source {

	constructor( data = null ) {

		this.isSource = true;

		Object.defineProperty( this, 'id', { value: _sourceId ++ } );

		this.uuid = generateUUID();

		this.data = data;
		this.dataReady = true;

		this.version = 0;

	}

	set needsUpdate( value ) {

		if ( value === true ) this.version ++;

	}

	toJSON( meta ) {

		const isRootObject = ( meta === undefined || typeof meta === 'string' );

		if ( ! isRootObject && meta.images[ this.uuid ] !== undefined ) {

			return meta.images[ this.uuid ];

		}

		const output = {
			uuid: this.uuid,
			url: ''
		};

		const data = this.data;

		if ( data !== null ) {

			let url;

			if ( Array.isArray( data ) ) {

				// cube texture

				url = [];

				for ( let i = 0, l = data.length; i < l; i ++ ) {

					if ( data[ i ].isDataTexture ) {

						url.push( serializeImage( data[ i ].image ) );

					} else {

						url.push( serializeImage( data[ i ] ) );

					}

				}

			} else {

				// texture

				url = serializeImage( data );

			}

			output.url = url;

		}

		if ( ! isRootObject ) {

			meta.images[ this.uuid ] = output;

		}

		return output;

	}

}

function serializeImage( image ) {

	if ( ( typeof HTMLImageElement !== 'undefined' && image instanceof HTMLImageElement ) ||
		( typeof HTMLCanvasElement !== 'undefined' && image instanceof HTMLCanvasElement ) ||
		( typeof ImageBitmap !== 'undefined' && image instanceof ImageBitmap ) ) {

		// default images

		return ImageUtils.getDataURL( image );

	} else {

		if ( image.data ) {

			// images of DataTexture

			return {
				data: Array.from( image.data ),
				width: image.width,
				height: image.height,
				type: image.data.constructor.name
			};

		} else {

			console.warn( 'THREE.Texture: Unable to serialize Texture.' );
			return {};

		}

	}

}

let _textureId = 0;

class Texture extends EventDispatcher {

	constructor( image = Texture.DEFAULT_IMAGE, mapping = Texture.DEFAULT_MAPPING, wrapS = ClampToEdgeWrapping, wrapT = ClampToEdgeWrapping, magFilter = LinearFilter, minFilter = LinearMipmapLinearFilter, format = RGBAFormat, type = UnsignedByteType, anisotropy = Texture.DEFAULT_ANISOTROPY, colorSpace = NoColorSpace ) {

		super();

		this.isTexture = true;

		Object.defineProperty( this, 'id', { value: _textureId ++ } );

		this.uuid = generateUUID();

		this.name = '';

		this.source = new Source( image );
		this.mipmaps = [];

		this.mapping = mapping;
		this.channel = 0;

		this.wrapS = wrapS;
		this.wrapT = wrapT;

		this.magFilter = magFilter;
		this.minFilter = minFilter;

		this.anisotropy = anisotropy;

		this.format = format;
		this.internalFormat = null;
		this.type = type;

		this.offset = new Vector2( 0, 0 );
		this.repeat = new Vector2( 1, 1 );
		this.center = new Vector2( 0, 0 );
		this.rotation = 0;

		this.matrixAutoUpdate = true;
		this.matrix = new Matrix3();

		this.generateMipmaps = true;
		this.premultiplyAlpha = false;
		this.flipY = true;
		this.unpackAlignment = 4;	// valid values: 1, 2, 4, 8 (see http://www.khronos.org/opengles/sdk/docs/man/xhtml/glPixelStorei.xml)

		this.colorSpace = colorSpace;

		this.userData = {};

		this.version = 0;
		this.onUpdate = null;

		this.isRenderTargetTexture = false; // indicates whether a texture belongs to a render target or not
		this.pmremVersion = 0; // indicates whether this texture should be processed by PMREMGenerator or not (only relevant for render target textures)

	}

	get image() {

		return this.source.data;

	}

	set image( value = null ) {

		this.source.data = value;

	}

	updateMatrix() {

		this.matrix.setUvTransform( this.offset.x, this.offset.y, this.repeat.x, this.repeat.y, this.rotation, this.center.x, this.center.y );

	}

	clone() {

		return new this.constructor().copy( this );

	}

	copy( source ) {

		this.name = source.name;

		this.source = source.source;
		this.mipmaps = source.mipmaps.slice( 0 );

		this.mapping = source.mapping;
		this.channel = source.channel;

		this.wrapS = source.wrapS;
		this.wrapT = source.wrapT;

		this.magFilter = source.magFilter;
		this.minFilter = source.minFilter;

		this.anisotropy = source.anisotropy;

		this.format = source.format;
		this.internalFormat = source.internalFormat;
		this.type = source.type;

		this.offset.copy( source.offset );
		this.repeat.copy( source.repeat );
		this.center.copy( source.center );
		this.rotation = source.rotation;

		this.matrixAutoUpdate = source.matrixAutoUpdate;
		this.matrix.copy( source.matrix );

		this.generateMipmaps = source.generateMipmaps;
		this.premultiplyAlpha = source.premultiplyAlpha;
		this.flipY = source.flipY;
		this.unpackAlignment = source.unpackAlignment;
		this.colorSpace = source.colorSpace;

		this.userData = JSON.parse( JSON.stringify( source.userData ) );

		this.needsUpdate = true;

		return this;

	}

	toJSON( meta ) {

		const isRootObject = ( meta === undefined || typeof meta === 'string' );

		if ( ! isRootObject && meta.textures[ this.uuid ] !== undefined ) {

			return meta.textures[ this.uuid ];

		}

		const output = {

			metadata: {
				version: 4.6,
				type: 'Texture',
				generator: 'Texture.toJSON'
			},

			uuid: this.uuid,
			name: this.name,

			image: this.source.toJSON( meta ).uuid,

			mapping: this.mapping,
			channel: this.channel,

			repeat: [ this.repeat.x, this.repeat.y ],
			offset: [ this.offset.x, this.offset.y ],
			center: [ this.center.x, this.center.y ],
			rotation: this.rotation,

			wrap: [ this.wrapS, this.wrapT ],

			format: this.format,
			internalFormat: this.internalFormat,
			type: this.type,
			colorSpace: this.colorSpace,

			minFilter: this.minFilter,
			magFilter: this.magFilter,
			anisotropy: this.anisotropy,

			flipY: this.flipY,

			generateMipmaps: this.generateMipmaps,
			premultiplyAlpha: this.premultiplyAlpha,
			unpackAlignment: this.unpackAlignment

		};

		if ( Object.keys( this.userData ).length > 0 ) output.userData = this.userData;

		if ( ! isRootObject ) {

			meta.textures[ this.uuid ] = output;

		}

		return output;

	}

	dispose() {

		this.dispatchEvent( { type: 'dispose' } );

	}

	transformUv( uv ) {

		if ( this.mapping !== UVMapping ) return uv;

		uv.applyMatrix3( this.matrix );

		if ( uv.x < 0 || uv.x > 1 ) {

			switch ( this.wrapS ) {

				case RepeatWrapping:

					uv.x = uv.x - Math.floor( uv.x );
					break;

				case ClampToEdgeWrapping:

					uv.x = uv.x < 0 ? 0 : 1;
					break;

				case MirroredRepeatWrapping:

					if ( Math.abs( Math.floor( uv.x ) % 2 ) === 1 ) {

						uv.x = Math.ceil( uv.x ) - uv.x;

					} else {

						uv.x = uv.x - Math.floor( uv.x );

					}

					break;

			}

		}

		if ( uv.y < 0 || uv.y > 1 ) {

			switch ( this.wrapT ) {

				case RepeatWrapping:

					uv.y = uv.y - Math.floor( uv.y );
					break;

				case ClampToEdgeWrapping:

					uv.y = uv.y < 0 ? 0 : 1;
					break;

				case MirroredRepeatWrapping:

					if ( Math.abs( Math.floor( uv.y ) % 2 ) === 1 ) {

						uv.y = Math.ceil( uv.y ) - uv.y;

					} else {

						uv.y = uv.y - Math.floor( uv.y );

					}

					break;

			}

		}

		if ( this.flipY ) {

			uv.y = 1 - uv.y;

		}

		return uv;

	}

	set needsUpdate( value ) {

		if ( value === true ) {

			this.version ++;
			this.source.needsUpdate = true;

		}

	}

	set needsPMREMUpdate( value ) {

		if ( value === true ) {

			this.pmremVersion ++;

		}

	}

}

Texture.DEFAULT_IMAGE = null;
Texture.DEFAULT_MAPPING = UVMapping;
Texture.DEFAULT_ANISOTROPY = 1;

class Vector4 {

	constructor( x = 0, y = 0, z = 0, w = 1 ) {

		Vector4.prototype.isVector4 = true;

		this.x = x;
		this.y = y;
		this.z = z;
		this.w = w;

	}

	get width() {

		return this.z;

	}

	set width( value ) {

		this.z = value;

	}

	get height() {

		return this.w;

	}

	set height( value ) {

		this.w = value;

	}

	set( x, y, z, w ) {

		this.x = x;
		this.y = y;
		this.z = z;
		this.w = w;

		return this;

	}

	setScalar( scalar ) {

		this.x = scalar;
		this.y = scalar;
		this.z = scalar;
		this.w = scalar;

		return this;

	}

	setX( x ) {

		this.x = x;

		return this;

	}

	setY( y ) {

		this.y = y;

		return this;

	}

	setZ( z ) {

		this.z = z;

		return this;

	}

	setW( w ) {

		this.w = w;

		return this;

	}

	setComponent( index, value ) {

		switch ( index ) {

			case 0: this.x = value; break;
			case 1: this.y = value; break;
			case 2: this.z = value; break;
			case 3: this.w = value; break;
			default: throw new Error( 'index is out of range: ' + index );

		}

		return this;

	}

	getComponent( index ) {

		switch ( index ) {

			case 0: return this.x;
			case 1: return this.y;
			case 2: return this.z;
			case 3: return this.w;
			default: throw new Error( 'index is out of range: ' + index );

		}

	}

	clone() {

		return new this.constructor( this.x, this.y, this.z, this.w );

	}

	copy( v ) {

		this.x = v.x;
		this.y = v.y;
		this.z = v.z;
		this.w = ( v.w !== undefined ) ? v.w : 1;

		return this;

	}

	add( v ) {

		this.x += v.x;
		this.y += v.y;
		this.z += v.z;
		this.w += v.w;

		return this;

	}

	addScalar( s ) {

		this.x += s;
		this.y += s;
		this.z += s;
		this.w += s;

		return this;

	}

	addVectors( a, b ) {

		this.x = a.x + b.x;
		this.y = a.y + b.y;
		this.z = a.z + b.z;
		this.w = a.w + b.w;

		return this;

	}

	addScaledVector( v, s ) {

		this.x += v.x * s;
		this.y += v.y * s;
		this.z += v.z * s;
		this.w += v.w * s;

		return this;

	}

	sub( v ) {

		this.x -= v.x;
		this.y -= v.y;
		this.z -= v.z;
		this.w -= v.w;

		return this;

	}

	subScalar( s ) {

		this.x -= s;
		this.y -= s;
		this.z -= s;
		this.w -= s;

		return this;

	}

	subVectors( a, b ) {

		this.x = a.x - b.x;
		this.y = a.y - b.y;
		this.z = a.z - b.z;
		this.w = a.w - b.w;

		return this;

	}

	multiply( v ) {

		this.x *= v.x;
		this.y *= v.y;
		this.z *= v.z;
		this.w *= v.w;

		return this;

	}

	multiplyScalar( scalar ) {

		this.x *= scalar;
		this.y *= scalar;
		this.z *= scalar;
		this.w *= scalar;

		return this;

	}

	applyMatrix4( m ) {

		const x = this.x, y = this.y, z = this.z, w = this.w;
		const e = m.elements;

		this.x = e[ 0 ] * x + e[ 4 ] * y + e[ 8 ] * z + e[ 12 ] * w;
		this.y = e[ 1 ] * x + e[ 5 ] * y + e[ 9 ] * z + e[ 13 ] * w;
		this.z = e[ 2 ] * x + e[ 6 ] * y + e[ 10 ] * z + e[ 14 ] * w;
		this.w = e[ 3 ] * x + e[ 7 ] * y + e[ 11 ] * z + e[ 15 ] * w;

		return this;

	}

	divideScalar( scalar ) {

		return this.multiplyScalar( 1 / scalar );

	}

	setAxisAngleFromQuaternion( q ) {

		// http://www.euclideanspace.com/maths/geometry/rotations/conversions/quaternionToAngle/index.htm

		// q is assumed to be normalized

		this.w = 2 * Math.acos( q.w );

		const s = Math.sqrt( 1 - q.w * q.w );

		if ( s < 0.0001 ) {

			this.x = 1;
			this.y = 0;
			this.z = 0;

		} else {

			this.x = q.x / s;
			this.y = q.y / s;
			this.z = q.z / s;

		}

		return this;

	}

	setAxisAngleFromRotationMatrix( m ) {

		// http://www.euclideanspace.com/maths/geometry/rotations/conversions/matrixToAngle/index.htm

		// assumes the upper 3x3 of m is a pure rotation matrix (i.e, unscaled)

		let angle, x, y, z; // variables for result
		const epsilon = 0.01,		// margin to allow for rounding errors
			epsilon2 = 0.1,		// margin to distinguish between 0 and 180 degrees

			te = m.elements,

			m11 = te[ 0 ], m12 = te[ 4 ], m13 = te[ 8 ],
			m21 = te[ 1 ], m22 = te[ 5 ], m23 = te[ 9 ],
			m31 = te[ 2 ], m32 = te[ 6 ], m33 = te[ 10 ];

		if ( ( Math.abs( m12 - m21 ) < epsilon ) &&
		     ( Math.abs( m13 - m31 ) < epsilon ) &&
		     ( Math.abs( m23 - m32 ) < epsilon ) ) {

			// singularity found
			// first check for identity matrix which must have +1 for all terms
			// in leading diagonal and zero in other terms

			if ( ( Math.abs( m12 + m21 ) < epsilon2 ) &&
			     ( Math.abs( m13 + m31 ) < epsilon2 ) &&
			     ( Math.abs( m23 + m32 ) < epsilon2 ) &&
			     ( Math.abs( m11 + m22 + m33 - 3 ) < epsilon2 ) ) {

				// this singularity is identity matrix so angle = 0

				this.set( 1, 0, 0, 0 );

				return this; // zero angle, arbitrary axis

			}

			// otherwise this singularity is angle = 180

			angle = Math.PI;

			const xx = ( m11 + 1 ) / 2;
			const yy = ( m22 + 1 ) / 2;
			const zz = ( m33 + 1 ) / 2;
			const xy = ( m12 + m21 ) / 4;
			const xz = ( m13 + m31 ) / 4;
			const yz = ( m23 + m32 ) / 4;

			if ( ( xx > yy ) && ( xx > zz ) ) {

				// m11 is the largest diagonal term

				if ( xx < epsilon ) {

					x = 0;
					y = 0.707106781;
					z = 0.707106781;

				} else {

					x = Math.sqrt( xx );
					y = xy / x;
					z = xz / x;

				}

			} else if ( yy > zz ) {

				// m22 is the largest diagonal term

				if ( yy < epsilon ) {

					x = 0.707106781;
					y = 0;
					z = 0.707106781;

				} else {

					y = Math.sqrt( yy );
					x = xy / y;
					z = yz / y;

				}

			} else {

				// m33 is the largest diagonal term so base result on this

				if ( zz < epsilon ) {

					x = 0.707106781;
					y = 0.707106781;
					z = 0;

				} else {

					z = Math.sqrt( zz );
					x = xz / z;
					y = yz / z;

				}

			}

			this.set( x, y, z, angle );

			return this; // return 180 deg rotation

		}

		// as we have reached here there are no singularities so we can handle normally

		let s = Math.sqrt( ( m32 - m23 ) * ( m32 - m23 ) +
			( m13 - m31 ) * ( m13 - m31 ) +
			( m21 - m12 ) * ( m21 - m12 ) ); // used to normalize

		if ( Math.abs( s ) < 0.001 ) s = 1;

		// prevent divide by zero, should not happen if matrix is orthogonal and should be
		// caught by singularity test above, but I've left it in just in case

		this.x = ( m32 - m23 ) / s;
		this.y = ( m13 - m31 ) / s;
		this.z = ( m21 - m12 ) / s;
		this.w = Math.acos( ( m11 + m22 + m33 - 1 ) / 2 );

		return this;

	}

	setFromMatrixPosition( m ) {

		const e = m.elements;

		this.x = e[ 12 ];
		this.y = e[ 13 ];
		this.z = e[ 14 ];
		this.w = e[ 15 ];

		return this;

	}

	min( v ) {

		this.x = Math.min( this.x, v.x );
		this.y = Math.min( this.y, v.y );
		this.z = Math.min( this.z, v.z );
		this.w = Math.min( this.w, v.w );

		return this;

	}

	max( v ) {

		this.x = Math.max( this.x, v.x );
		this.y = Math.max( this.y, v.y );
		this.z = Math.max( this.z, v.z );
		this.w = Math.max( this.w, v.w );

		return this;

	}

	clamp( min, max ) {

		// assumes min < max, componentwise

		this.x = Math.max( min.x, Math.min( max.x, this.x ) );
		this.y = Math.max( min.y, Math.min( max.y, this.y ) );
		this.z = Math.max( min.z, Math.min( max.z, this.z ) );
		this.w = Math.max( min.w, Math.min( max.w, this.w ) );

		return this;

	}

	clampScalar( minVal, maxVal ) {

		this.x = Math.max( minVal, Math.min( maxVal, this.x ) );
		this.y = Math.max( minVal, Math.min( maxVal, this.y ) );
		this.z = Math.max( minVal, Math.min( maxVal, this.z ) );
		this.w = Math.max( minVal, Math.min( maxVal, this.w ) );

		return this;

	}

	clampLength( min, max ) {

		const length = this.length();

		return this.divideScalar( length || 1 ).multiplyScalar( Math.max( min, Math.min( max, length ) ) );

	}

	floor() {

		this.x = Math.floor( this.x );
		this.y = Math.floor( this.y );
		this.z = Math.floor( this.z );
		this.w = Math.floor( this.w );

		return this;

	}

	ceil() {

		this.x = Math.ceil( this.x );
		this.y = Math.ceil( this.y );
		this.z = Math.ceil( this.z );
		this.w = Math.ceil( this.w );

		return this;

	}

	round() {

		this.x = Math.round( this.x );
		this.y = Math.round( this.y );
		this.z = Math.round( this.z );
		this.w = Math.round( this.w );

		return this;

	}

	roundToZero() {

		this.x = Math.trunc( this.x );
		this.y = Math.trunc( this.y );
		this.z = Math.trunc( this.z );
		this.w = Math.trunc( this.w );

		return this;

	}

	negate() {

		this.x = - this.x;
		this.y = - this.y;
		this.z = - this.z;
		this.w = - this.w;

		return this;

	}

	dot( v ) {

		return this.x * v.x + this.y * v.y + this.z * v.z + this.w * v.w;

	}

	lengthSq() {

		return this.x * this.x + this.y * this.y + this.z * this.z + this.w * this.w;

	}

	length() {

		return Math.sqrt( this.x * this.x + this.y * this.y + this.z * this.z + this.w * this.w );

	}

	manhattanLength() {

		return Math.abs( this.x ) + Math.abs( this.y ) + Math.abs( this.z ) + Math.abs( this.w );

	}

	normalize() {

		return this.divideScalar( this.length() || 1 );

	}

	setLength( length ) {

		return this.normalize().multiplyScalar( length );

	}

	lerp( v, alpha ) {

		this.x += ( v.x - this.x ) * alpha;
		this.y += ( v.y - this.y ) * alpha;
		this.z += ( v.z - this.z ) * alpha;
		this.w += ( v.w - this.w ) * alpha;

		return this;

	}

	lerpVectors( v1, v2, alpha ) {

		this.x = v1.x + ( v2.x - v1.x ) * alpha;
		this.y = v1.y + ( v2.y - v1.y ) * alpha;
		this.z = v1.z + ( v2.z - v1.z ) * alpha;
		this.w = v1.w + ( v2.w - v1.w ) * alpha;

		return this;

	}

	equals( v ) {

		return ( ( v.x === this.x ) && ( v.y === this.y ) && ( v.z === this.z ) && ( v.w === this.w ) );

	}

	fromArray( array, offset = 0 ) {

		this.x = array[ offset ];
		this.y = array[ offset + 1 ];
		this.z = array[ offset + 2 ];
		this.w = array[ offset + 3 ];

		return this;

	}

	toArray( array = [], offset = 0 ) {

		array[ offset ] = this.x;
		array[ offset + 1 ] = this.y;
		array[ offset + 2 ] = this.z;
		array[ offset + 3 ] = this.w;

		return array;

	}

	fromBufferAttribute( attribute, index ) {

		this.x = attribute.getX( index );
		this.y = attribute.getY( index );
		this.z = attribute.getZ( index );
		this.w = attribute.getW( index );

		return this;

	}

	random() {

		this.x = Math.random();
		this.y = Math.random();
		this.z = Math.random();
		this.w = Math.random();

		return this;

	}

	*[ Symbol.iterator ]() {

		yield this.x;
		yield this.y;
		yield this.z;
		yield this.w;

	}

}

/*
 In options, we can specify:
 * Texture parameters for an auto-generated target texture
 * depthBuffer/stencilBuffer: Booleans to indicate if we should generate these buffers
*/
class RenderTarget extends EventDispatcher {

	constructor( width = 1, height = 1, options = {} ) {

		super();

		this.isRenderTarget = true;

		this.width = width;
		this.height = height;
		this.depth = 1;

		this.scissor = new Vector4( 0, 0, width, height );
		this.scissorTest = false;

		this.viewport = new Vector4( 0, 0, width, height );

		const image = { width: width, height: height, depth: 1 };

		options = Object.assign( {
			generateMipmaps: false,
			internalFormat: null,
			minFilter: LinearFilter,
			depthBuffer: true,
			stencilBuffer: false,
			resolveDepthBuffer: true,
			resolveStencilBuffer: true,
			depthTexture: null,
			samples: 0,
			count: 1
		}, options );

		const texture = new Texture( image, options.mapping, options.wrapS, options.wrapT, options.magFilter, options.minFilter, options.format, options.type, options.anisotropy, options.colorSpace );

		texture.flipY = false;
		texture.generateMipmaps = options.generateMipmaps;
		texture.internalFormat = options.internalFormat;

		this.textures = [];

		const count = options.count;
		for ( let i = 0; i < count; i ++ ) {

			this.textures[ i ] = texture.clone();
			this.textures[ i ].isRenderTargetTexture = true;

		}

		this.depthBuffer = options.depthBuffer;
		this.stencilBuffer = options.stencilBuffer;

		this.resolveDepthBuffer = options.resolveDepthBuffer;
		this.resolveStencilBuffer = options.resolveStencilBuffer;

		this.depthTexture = options.depthTexture;

		this.samples = options.samples;

	}

	get texture() {

		return this.textures[ 0 ];

	}

	set texture( value ) {

		this.textures[ 0 ] = value;

	}

	setSize( width, height, depth = 1 ) {

		if ( this.width !== width || this.height !== height || this.depth !== depth ) {

			this.width = width;
			this.height = height;
			this.depth = depth;

			for ( let i = 0, il = this.textures.length; i < il; i ++ ) {

				this.textures[ i ].image.width = width;
				this.textures[ i ].image.height = height;
				this.textures[ i ].image.depth = depth;

			}

			this.dispose();

		}

		this.viewport.set( 0, 0, width, height );
		this.scissor.set( 0, 0, width, height );

	}

	clone() {

		return new this.constructor().copy( this );

	}

	copy( source ) {

		this.width = source.width;
		this.height = source.height;
		this.depth = source.depth;

		this.scissor.copy( source.scissor );
		this.scissorTest = source.scissorTest;

		this.viewport.copy( source.viewport );

		this.textures.length = 0;

		for ( let i = 0, il = source.textures.length; i < il; i ++ ) {

			this.textures[ i ] = source.textures[ i ].clone();
			this.textures[ i ].isRenderTargetTexture = true;

		}

		// ensure image object is not shared, see #20328

		const image = Object.assign( {}, source.texture.image );
		this.texture.source = new Source( image );

		this.depthBuffer = source.depthBuffer;
		this.stencilBuffer = source.stencilBuffer;

		this.resolveDepthBuffer = source.resolveDepthBuffer;
		this.resolveStencilBuffer = source.resolveStencilBuffer;

		if ( source.depthTexture !== null ) this.depthTexture = source.depthTexture.clone();

		this.samples = source.samples;

		return this;

	}

	dispose() {

		this.dispatchEvent( { type: 'dispose' } );

	}

}

class WebGLRenderTarget extends RenderTarget {

	constructor( width = 1, height = 1, options = {} ) {

		super( width, height, options );

		this.isWebGLRenderTarget = true;

	}

}

class DataArrayTexture extends Texture {

	constructor( data = null, width = 1, height = 1, depth = 1 ) {

		super( null );

		this.isDataArrayTexture = true;

		this.image = { data, width, height, depth };

		this.magFilter = NearestFilter;
		this.minFilter = NearestFilter;

		this.wrapR = ClampToEdgeWrapping;

		this.generateMipmaps = false;
		this.flipY = false;
		this.unpackAlignment = 1;

		this.layerUpdates = new Set();

	}

	addLayerUpdate( layerIndex ) {

		this.layerUpdates.add( layerIndex );

	}

	clearLayerUpdates() {

		this.layerUpdates.clear();

	}

}

class WebGLArrayRenderTarget extends WebGLRenderTarget {

	constructor( width = 1, height = 1, depth = 1, options = {} ) {

		super( width, height, options );

		this.isWebGLArrayRenderTarget = true;

		this.depth = depth;

		this.texture = new DataArrayTexture( null, width, height, depth );

		this.texture.isRenderTargetTexture = true;

	}

}

class Data3DTexture extends Texture {

	constructor( data = null, width = 1, height = 1, depth = 1 ) {

		// We're going to add .setXXX() methods for setting properties later.
		// Users can still set in DataTexture3D directly.
		//
		//	const texture = new THREE.DataTexture3D( data, width, height, depth );
		// 	texture.anisotropy = 16;
		//
		// See #14839

		super( null );

		this.isData3DTexture = true;

		this.image = { data, width, height, depth };

		this.magFilter = NearestFilter;
		this.minFilter = NearestFilter;

		this.wrapR = ClampToEdgeWrapping;

		this.generateMipmaps = false;
		this.flipY = false;
		this.unpackAlignment = 1;

	}

}

class WebGL3DRenderTarget extends WebGLRenderTarget {

	constructor( width = 1, height = 1, depth = 1, options = {} ) {

		super( width, height, options );

		this.isWebGL3DRenderTarget = true;

		this.depth = depth;

		this.texture = new Data3DTexture( null, width, height, depth );

		this.texture.isRenderTargetTexture = true;

	}

}

class Quaternion {

	constructor( x = 0, y = 0, z = 0, w = 1 ) {

		this.isQuaternion = true;

		this._x = x;
		this._y = y;
		this._z = z;
		this._w = w;

	}

	static slerpFlat( dst, dstOffset, src0, srcOffset0, src1, srcOffset1, t ) {

		// fuzz-free, array-based Quaternion SLERP operation

		let x0 = src0[ srcOffset0 + 0 ],
			y0 = src0[ srcOffset0 + 1 ],
			z0 = src0[ srcOffset0 + 2 ],
			w0 = src0[ srcOffset0 + 3 ];

		const x1 = src1[ srcOffset1 + 0 ],
			y1 = src1[ srcOffset1 + 1 ],
			z1 = src1[ srcOffset1 + 2 ],
			w1 = src1[ srcOffset1 + 3 ];

		if ( t === 0 ) {

			dst[ dstOffset + 0 ] = x0;
			dst[ dstOffset + 1 ] = y0;
			dst[ dstOffset + 2 ] = z0;
			dst[ dstOffset + 3 ] = w0;
			return;

		}

		if ( t === 1 ) {

			dst[ dstOffset + 0 ] = x1;
			dst[ dstOffset + 1 ] = y1;
			dst[ dstOffset + 2 ] = z1;
			dst[ dstOffset + 3 ] = w1;
			return;

		}

		if ( w0 !== w1 || x0 !== x1 || y0 !== y1 || z0 !== z1 ) {

			let s = 1 - t;
			const cos = x0 * x1 + y0 * y1 + z0 * z1 + w0 * w1,
				dir = ( cos >= 0 ? 1 : - 1 ),
				sqrSin = 1 - cos * cos;

			// Skip the Slerp for tiny steps to avoid numeric problems:
			if ( sqrSin > Number.EPSILON ) {

				const sin = Math.sqrt( sqrSin ),
					len = Math.atan2( sin, cos * dir );

				s = Math.sin( s * len ) / sin;
				t = Math.sin( t * len ) / sin;

			}

			const tDir = t * dir;

			x0 = x0 * s + x1 * tDir;
			y0 = y0 * s + y1 * tDir;
			z0 = z0 * s + z1 * tDir;
			w0 = w0 * s + w1 * tDir;

			// Normalize in case we just did a lerp:
			if ( s === 1 - t ) {

				const f = 1 / Math.sqrt( x0 * x0 + y0 * y0 + z0 * z0 + w0 * w0 );

				x0 *= f;
				y0 *= f;
				z0 *= f;
				w0 *= f;

			}

		}

		dst[ dstOffset ] = x0;
		dst[ dstOffset + 1 ] = y0;
		dst[ dstOffset + 2 ] = z0;
		dst[ dstOffset + 3 ] = w0;

	}

	static multiplyQuaternionsFlat( dst, dstOffset, src0, srcOffset0, src1, srcOffset1 ) {

		const x0 = src0[ srcOffset0 ];
		const y0 = src0[ srcOffset0 + 1 ];
		const z0 = src0[ srcOffset0 + 2 ];
		const w0 = src0[ srcOffset0 + 3 ];

		const x1 = src1[ srcOffset1 ];
		const y1 = src1[ srcOffset1 + 1 ];
		const z1 = src1[ srcOffset1 + 2 ];
		const w1 = src1[ srcOffset1 + 3 ];

		dst[ dstOffset ] = x0 * w1 + w0 * x1 + y0 * z1 - z0 * y1;
		dst[ dstOffset + 1 ] = y0 * w1 + w0 * y1 + z0 * x1 - x0 * z1;
		dst[ dstOffset + 2 ] = z0 * w1 + w0 * z1 + x0 * y1 - y0 * x1;
		dst[ dstOffset + 3 ] = w0 * w1 - x0 * x1 - y0 * y1 - z0 * z1;

		return dst;

	}

	get x() {

		return this._x;

	}

	set x( value ) {

		this._x = value;
		this._onChangeCallback();

	}

	get y() {

		return this._y;

	}

	set y( value ) {

		this._y = value;
		this._onChangeCallback();

	}

	get z() {

		return this._z;

	}

	set z( value ) {

		this._z = value;
		this._onChangeCallback();

	}

	get w() {

		return this._w;

	}

	set w( value ) {

		this._w = value;
		this._onChangeCallback();

	}

	set( x, y, z, w ) {

		this._x = x;
		this._y = y;
		this._z = z;
		this._w = w;

		this._onChangeCallback();

		return this;

	}

	clone() {

		return new this.constructor( this._x, this._y, this._z, this._w );

	}

	copy( quaternion ) {

		this._x = quaternion.x;
		this._y = quaternion.y;
		this._z = quaternion.z;
		this._w = quaternion.w;

		this._onChangeCallback();

		return this;

	}

	setFromEuler( euler, update = true ) {

		const x = euler._x, y = euler._y, z = euler._z, order = euler._order;

		// http://www.mathworks.com/matlabcentral/fileexchange/
		// 	20696-function-to-convert-between-dcm-euler-angles-quaternions-and-euler-vectors/
		//	content/SpinCalc.m

		const cos = Math.cos;
		const sin = Math.sin;

		const c1 = cos( x / 2 );
		const c2 = cos( y / 2 );
		const c3 = cos( z / 2 );

		const s1 = sin( x / 2 );
		const s2 = sin( y / 2 );
		const s3 = sin( z / 2 );

		switch ( order ) {

			case 'XYZ':
				this._x = s1 * c2 * c3 + c1 * s2 * s3;
				this._y = c1 * s2 * c3 - s1 * c2 * s3;
				this._z = c1 * c2 * s3 + s1 * s2 * c3;
				this._w = c1 * c2 * c3 - s1 * s2 * s3;
				break;

			case 'YXZ':
				this._x = s1 * c2 * c3 + c1 * s2 * s3;
				this._y = c1 * s2 * c3 - s1 * c2 * s3;
				this._z = c1 * c2 * s3 - s1 * s2 * c3;
				this._w = c1 * c2 * c3 + s1 * s2 * s3;
				break;

			case 'ZXY':
				this._x = s1 * c2 * c3 - c1 * s2 * s3;
				this._y = c1 * s2 * c3 + s1 * c2 * s3;
				this._z = c1 * c2 * s3 + s1 * s2 * c3;
				this._w = c1 * c2 * c3 - s1 * s2 * s3;
				break;

			case 'ZYX':
				this._x = s1 * c2 * c3 - c1 * s2 * s3;
				this._y = c1 * s2 * c3 + s1 * c2 * s3;
				this._z = c1 * c2 * s3 - s1 * s2 * c3;
				this._w = c1 * c2 * c3 + s1 * s2 * s3;
				break;

			case 'YZX':
				this._x = s1 * c2 * c3 + c1 * s2 * s3;
				this._y = c1 * s2 * c3 + s1 * c2 * s3;
				this._z = c1 * c2 * s3 - s1 * s2 * c3;
				this._w = c1 * c2 * c3 - s1 * s2 * s3;
				break;

			case 'XZY':
				this._x = s1 * c2 * c3 - c1 * s2 * s3;
				this._y = c1 * s2 * c3 - s1 * c2 * s3;
				this._z = c1 * c2 * s3 + s1 * s2 * c3;
				this._w = c1 * c2 * c3 + s1 * s2 * s3;
				break;

			default:
				console.warn( 'THREE.Quaternion: .setFromEuler() encountered an unknown order: ' + order );

		}

		if ( update === true ) this._onChangeCallback();

		return this;

	}

	setFromAxisAngle( axis, angle ) {

		// http://www.euclideanspace.com/maths/geometry/rotations/conversions/angleToQuaternion/index.htm

		// assumes axis is normalized

		const halfAngle = angle / 2, s = Math.sin( halfAngle );

		this._x = axis.x * s;
		this._y = axis.y * s;
		this._z = axis.z * s;
		this._w = Math.cos( halfAngle );

		this._onChangeCallback();

		return this;

	}

	setFromRotationMatrix( m ) {

		// http://www.euclideanspace.com/maths/geometry/rotations/conversions/matrixToQuaternion/index.htm

		// assumes the upper 3x3 of m is a pure rotation matrix (i.e, unscaled)

		const te = m.elements,

			m11 = te[ 0 ], m12 = te[ 4 ], m13 = te[ 8 ],
			m21 = te[ 1 ], m22 = te[ 5 ], m23 = te[ 9 ],
			m31 = te[ 2 ], m32 = te[ 6 ], m33 = te[ 10 ],

			trace = m11 + m22 + m33;

		if ( trace > 0 ) {

			const s = 0.5 / Math.sqrt( trace + 1.0 );

			this._w = 0.25 / s;
			this._x = ( m32 - m23 ) * s;
			this._y = ( m13 - m31 ) * s;
			this._z = ( m21 - m12 ) * s;

		} else if ( m11 > m22 && m11 > m33 ) {

			const s = 2.0 * Math.sqrt( 1.0 + m11 - m22 - m33 );

			this._w = ( m32 - m23 ) / s;
			this._x = 0.25 * s;
			this._y = ( m12 + m21 ) / s;
			this._z = ( m13 + m31 ) / s;

		} else if ( m22 > m33 ) {

			const s = 2.0 * Math.sqrt( 1.0 + m22 - m11 - m33 );

			this._w = ( m13 - m31 ) / s;
			this._x = ( m12 + m21 ) / s;
			this._y = 0.25 * s;
			this._z = ( m23 + m32 ) / s;

		} else {

			const s = 2.0 * Math.sqrt( 1.0 + m33 - m11 - m22 );

			this._w = ( m21 - m12 ) / s;
			this._x = ( m13 + m31 ) / s;
			this._y = ( m23 + m32 ) / s;
			this._z = 0.25 * s;

		}

		this._onChangeCallback();

		return this;

	}

	setFromUnitVectors( vFrom, vTo ) {

		// assumes direction vectors vFrom and vTo are normalized

		let r = vFrom.dot( vTo ) + 1;

		if ( r < Number.EPSILON ) {

			// vFrom and vTo point in opposite directions

			r = 0;

			if ( Math.abs( vFrom.x ) > Math.abs( vFrom.z ) ) {

				this._x = - vFrom.y;
				this._y = vFrom.x;
				this._z = 0;
				this._w = r;

			} else {

				this._x = 0;
				this._y = - vFrom.z;
				this._z = vFrom.y;
				this._w = r;

			}

		} else {

			// crossVectors( vFrom, vTo ); // inlined to avoid cyclic dependency on Vector3

			this._x = vFrom.y * vTo.z - vFrom.z * vTo.y;
			this._y = vFrom.z * vTo.x - vFrom.x * vTo.z;
			this._z = vFrom.x * vTo.y - vFrom.y * vTo.x;
			this._w = r;

		}

		return this.normalize();

	}

	angleTo( q ) {

		return 2 * Math.acos( Math.abs( clamp$1( this.dot( q ), - 1, 1 ) ) );

	}

	rotateTowards( q, step ) {

		const angle = this.angleTo( q );

		if ( angle === 0 ) return this;

		const t = Math.min( 1, step / angle );

		this.slerp( q, t );

		return this;

	}

	identity() {

		return this.set( 0, 0, 0, 1 );

	}

	invert() {

		// quaternion is assumed to have unit length

		return this.conjugate();

	}

	conjugate() {

		this._x *= - 1;
		this._y *= - 1;
		this._z *= - 1;

		this._onChangeCallback();

		return this;

	}

	dot( v ) {

		return this._x * v._x + this._y * v._y + this._z * v._z + this._w * v._w;

	}

	lengthSq() {

		return this._x * this._x + this._y * this._y + this._z * this._z + this._w * this._w;

	}

	length() {

		return Math.sqrt( this._x * this._x + this._y * this._y + this._z * this._z + this._w * this._w );

	}

	normalize() {

		let l = this.length();

		if ( l === 0 ) {

			this._x = 0;
			this._y = 0;
			this._z = 0;
			this._w = 1;

		} else {

			l = 1 / l;

			this._x = this._x * l;
			this._y = this._y * l;
			this._z = this._z * l;
			this._w = this._w * l;

		}

		this._onChangeCallback();

		return this;

	}

	multiply( q ) {

		return this.multiplyQuaternions( this, q );

	}

	premultiply( q ) {

		return this.multiplyQuaternions( q, this );

	}

	multiplyQuaternions( a, b ) {

		// from http://www.euclideanspace.com/maths/algebra/realNormedAlgebra/quaternions/code/index.htm

		const qax = a._x, qay = a._y, qaz = a._z, qaw = a._w;
		const qbx = b._x, qby = b._y, qbz = b._z, qbw = b._w;

		this._x = qax * qbw + qaw * qbx + qay * qbz - qaz * qby;
		this._y = qay * qbw + qaw * qby + qaz * qbx - qax * qbz;
		this._z = qaz * qbw + qaw * qbz + qax * qby - qay * qbx;
		this._w = qaw * qbw - qax * qbx - qay * qby - qaz * qbz;

		this._onChangeCallback();

		return this;

	}

	slerp( qb, t ) {

		if ( t === 0 ) return this;
		if ( t === 1 ) return this.copy( qb );

		const x = this._x, y = this._y, z = this._z, w = this._w;

		// http://www.euclideanspace.com/maths/algebra/realNormedAlgebra/quaternions/slerp/

		let cosHalfTheta = w * qb._w + x * qb._x + y * qb._y + z * qb._z;

		if ( cosHalfTheta < 0 ) {

			this._w = - qb._w;
			this._x = - qb._x;
			this._y = - qb._y;
			this._z = - qb._z;

			cosHalfTheta = - cosHalfTheta;

		} else {

			this.copy( qb );

		}

		if ( cosHalfTheta >= 1.0 ) {

			this._w = w;
			this._x = x;
			this._y = y;
			this._z = z;

			return this;

		}

		const sqrSinHalfTheta = 1.0 - cosHalfTheta * cosHalfTheta;

		if ( sqrSinHalfTheta <= Number.EPSILON ) {

			const s = 1 - t;
			this._w = s * w + t * this._w;
			this._x = s * x + t * this._x;
			this._y = s * y + t * this._y;
			this._z = s * z + t * this._z;

			this.normalize(); // normalize calls _onChangeCallback()

			return this;

		}

		const sinHalfTheta = Math.sqrt( sqrSinHalfTheta );
		const halfTheta = Math.atan2( sinHalfTheta, cosHalfTheta );
		const ratioA = Math.sin( ( 1 - t ) * halfTheta ) / sinHalfTheta,
			ratioB = Math.sin( t * halfTheta ) / sinHalfTheta;

		this._w = ( w * ratioA + this._w * ratioB );
		this._x = ( x * ratioA + this._x * ratioB );
		this._y = ( y * ratioA + this._y * ratioB );
		this._z = ( z * ratioA + this._z * ratioB );

		this._onChangeCallback();

		return this;

	}

	slerpQuaternions( qa, qb, t ) {

		return this.copy( qa ).slerp( qb, t );

	}

	random() {

		// sets this quaternion to a uniform random unit quaternnion

		// Ken Shoemake
		// Uniform random rotations
		// D. Kirk, editor, Graphics Gems III, pages 124-132. Academic Press, New York, 1992.

		const theta1 = 2 * Math.PI * Math.random();
		const theta2 = 2 * Math.PI * Math.random();

		const x0 = Math.random();
		const r1 = Math.sqrt( 1 - x0 );
		const r2 = Math.sqrt( x0 );

		return this.set(
			r1 * Math.sin( theta1 ),
			r1 * Math.cos( theta1 ),
			r2 * Math.sin( theta2 ),
			r2 * Math.cos( theta2 ),
		);

	}

	equals( quaternion ) {

		return ( quaternion._x === this._x ) && ( quaternion._y === this._y ) && ( quaternion._z === this._z ) && ( quaternion._w === this._w );

	}

	fromArray( array, offset = 0 ) {

		this._x = array[ offset ];
		this._y = array[ offset + 1 ];
		this._z = array[ offset + 2 ];
		this._w = array[ offset + 3 ];

		this._onChangeCallback();

		return this;

	}

	toArray( array = [], offset = 0 ) {

		array[ offset ] = this._x;
		array[ offset + 1 ] = this._y;
		array[ offset + 2 ] = this._z;
		array[ offset + 3 ] = this._w;

		return array;

	}

	fromBufferAttribute( attribute, index ) {

		this._x = attribute.getX( index );
		this._y = attribute.getY( index );
		this._z = attribute.getZ( index );
		this._w = attribute.getW( index );

		this._onChangeCallback();

		return this;

	}

	toJSON() {

		return this.toArray();

	}

	_onChange( callback ) {

		this._onChangeCallback = callback;

		return this;

	}

	_onChangeCallback() {}

	*[ Symbol.iterator ]() {

		yield this._x;
		yield this._y;
		yield this._z;
		yield this._w;

	}

}

class Vector3 {

	constructor( x = 0, y = 0, z = 0 ) {

		Vector3.prototype.isVector3 = true;

		this.x = x;
		this.y = y;
		this.z = z;

	}

	set( x, y, z ) {

		if ( z === undefined ) z = this.z; // sprite.scale.set(x,y)

		this.x = x;
		this.y = y;
		this.z = z;

		return this;

	}

	setScalar( scalar ) {

		this.x = scalar;
		this.y = scalar;
		this.z = scalar;

		return this;

	}

	setX( x ) {

		this.x = x;

		return this;

	}

	setY( y ) {

		this.y = y;

		return this;

	}

	setZ( z ) {

		this.z = z;

		return this;

	}

	setComponent( index, value ) {

		switch ( index ) {

			case 0: this.x = value; break;
			case 1: this.y = value; break;
			case 2: this.z = value; break;
			default: throw new Error( 'index is out of range: ' + index );

		}

		return this;

	}

	getComponent( index ) {

		switch ( index ) {

			case 0: return this.x;
			case 1: return this.y;
			case 2: return this.z;
			default: throw new Error( 'index is out of range: ' + index );

		}

	}

	clone() {

		return new this.constructor( this.x, this.y, this.z );

	}

	copy( v ) {

		this.x = v.x;
		this.y = v.y;
		this.z = v.z;

		return this;

	}

	add( v ) {

		this.x += v.x;
		this.y += v.y;
		this.z += v.z;

		return this;

	}

	addScalar( s ) {

		this.x += s;
		this.y += s;
		this.z += s;

		return this;

	}

	addVectors( a, b ) {

		this.x = a.x + b.x;
		this.y = a.y + b.y;
		this.z = a.z + b.z;

		return this;

	}

	addScaledVector( v, s ) {

		this.x += v.x * s;
		this.y += v.y * s;
		this.z += v.z * s;

		return this;

	}

	sub( v ) {

		this.x -= v.x;
		this.y -= v.y;
		this.z -= v.z;

		return this;

	}

	subScalar( s ) {

		this.x -= s;
		this.y -= s;
		this.z -= s;

		return this;

	}

	subVectors( a, b ) {

		this.x = a.x - b.x;
		this.y = a.y - b.y;
		this.z = a.z - b.z;

		return this;

	}

	multiply( v ) {

		this.x *= v.x;
		this.y *= v.y;
		this.z *= v.z;

		return this;

	}

	multiplyScalar( scalar ) {

		this.x *= scalar;
		this.y *= scalar;
		this.z *= scalar;

		return this;

	}

	multiplyVectors( a, b ) {

		this.x = a.x * b.x;
		this.y = a.y * b.y;
		this.z = a.z * b.z;

		return this;

	}

	applyEuler( euler ) {

		return this.applyQuaternion( _quaternion$4.setFromEuler( euler ) );

	}

	applyAxisAngle( axis, angle ) {

		return this.applyQuaternion( _quaternion$4.setFromAxisAngle( axis, angle ) );

	}

	applyMatrix3( m ) {

		const x = this.x, y = this.y, z = this.z;
		const e = m.elements;

		this.x = e[ 0 ] * x + e[ 3 ] * y + e[ 6 ] * z;
		this.y = e[ 1 ] * x + e[ 4 ] * y + e[ 7 ] * z;
		this.z = e[ 2 ] * x + e[ 5 ] * y + e[ 8 ] * z;

		return this;

	}

	applyNormalMatrix( m ) {

		return this.applyMatrix3( m ).normalize();

	}

	applyMatrix4( m ) {

		const x = this.x, y = this.y, z = this.z;
		const e = m.elements;

		const w = 1 / ( e[ 3 ] * x + e[ 7 ] * y + e[ 11 ] * z + e[ 15 ] );

		this.x = ( e[ 0 ] * x + e[ 4 ] * y + e[ 8 ] * z + e[ 12 ] ) * w;
		this.y = ( e[ 1 ] * x + e[ 5 ] * y + e[ 9 ] * z + e[ 13 ] ) * w;
		this.z = ( e[ 2 ] * x + e[ 6 ] * y + e[ 10 ] * z + e[ 14 ] ) * w;

		return this;

	}

	applyQuaternion( q ) {

		// quaternion q is assumed to have unit length

		const vx = this.x, vy = this.y, vz = this.z;
		const qx = q.x, qy = q.y, qz = q.z, qw = q.w;

		// t = 2 * cross( q.xyz, v );
		const tx = 2 * ( qy * vz - qz * vy );
		const ty = 2 * ( qz * vx - qx * vz );
		const tz = 2 * ( qx * vy - qy * vx );

		// v + q.w * t + cross( q.xyz, t );
		this.x = vx + qw * tx + qy * tz - qz * ty;
		this.y = vy + qw * ty + qz * tx - qx * tz;
		this.z = vz + qw * tz + qx * ty - qy * tx;

		return this;

	}

	project( camera ) {

		return this.applyMatrix4( camera.matrixWorldInverse ).applyMatrix4( camera.projectionMatrix );

	}

	unproject( camera ) {

		return this.applyMatrix4( camera.projectionMatrixInverse ).applyMatrix4( camera.matrixWorld );

	}

	transformDirection( m ) {

		// input: THREE.Matrix4 affine matrix
		// vector interpreted as a direction

		const x = this.x, y = this.y, z = this.z;
		const e = m.elements;

		this.x = e[ 0 ] * x + e[ 4 ] * y + e[ 8 ] * z;
		this.y = e[ 1 ] * x + e[ 5 ] * y + e[ 9 ] * z;
		this.z = e[ 2 ] * x + e[ 6 ] * y + e[ 10 ] * z;

		return this.normalize();

	}

	divide( v ) {

		this.x /= v.x;
		this.y /= v.y;
		this.z /= v.z;

		return this;

	}

	divideScalar( scalar ) {

		return this.multiplyScalar( 1 / scalar );

	}

	min( v ) {

		this.x = Math.min( this.x, v.x );
		this.y = Math.min( this.y, v.y );
		this.z = Math.min( this.z, v.z );

		return this;

	}

	max( v ) {

		this.x = Math.max( this.x, v.x );
		this.y = Math.max( this.y, v.y );
		this.z = Math.max( this.z, v.z );

		return this;

	}

	clamp( min, max ) {

		// assumes min < max, componentwise

		this.x = Math.max( min.x, Math.min( max.x, this.x ) );
		this.y = Math.max( min.y, Math.min( max.y, this.y ) );
		this.z = Math.max( min.z, Math.min( max.z, this.z ) );

		return this;

	}

	clampScalar( minVal, maxVal ) {

		this.x = Math.max( minVal, Math.min( maxVal, this.x ) );
		this.y = Math.max( minVal, Math.min( maxVal, this.y ) );
		this.z = Math.max( minVal, Math.min( maxVal, this.z ) );

		return this;

	}

	clampLength( min, max ) {

		const length = this.length();

		return this.divideScalar( length || 1 ).multiplyScalar( Math.max( min, Math.min( max, length ) ) );

	}

	floor() {

		this.x = Math.floor( this.x );
		this.y = Math.floor( this.y );
		this.z = Math.floor( this.z );

		return this;

	}

	ceil() {

		this.x = Math.ceil( this.x );
		this.y = Math.ceil( this.y );
		this.z = Math.ceil( this.z );

		return this;

	}

	round() {

		this.x = Math.round( this.x );
		this.y = Math.round( this.y );
		this.z = Math.round( this.z );

		return this;

	}

	roundToZero() {

		this.x = Math.trunc( this.x );
		this.y = Math.trunc( this.y );
		this.z = Math.trunc( this.z );

		return this;

	}

	negate() {

		this.x = - this.x;
		this.y = - this.y;
		this.z = - this.z;

		return this;

	}

	dot( v ) {

		return this.x * v.x + this.y * v.y + this.z * v.z;

	}

	// TODO lengthSquared?

	lengthSq() {

		return this.x * this.x + this.y * this.y + this.z * this.z;

	}

	length() {

		return Math.sqrt( this.x * this.x + this.y * this.y + this.z * this.z );

	}

	manhattanLength() {

		return Math.abs( this.x ) + Math.abs( this.y ) + Math.abs( this.z );

	}

	normalize() {

		return this.divideScalar( this.length() || 1 );

	}

	setLength( length ) {

		return this.normalize().multiplyScalar( length );

	}

	lerp( v, alpha ) {

		this.x += ( v.x - this.x ) * alpha;
		this.y += ( v.y - this.y ) * alpha;
		this.z += ( v.z - this.z ) * alpha;

		return this;

	}

	lerpVectors( v1, v2, alpha ) {

		this.x = v1.x + ( v2.x - v1.x ) * alpha;
		this.y = v1.y + ( v2.y - v1.y ) * alpha;
		this.z = v1.z + ( v2.z - v1.z ) * alpha;

		return this;

	}

	cross( v ) {

		return this.crossVectors( this, v );

	}

	crossVectors( a, b ) {

		const ax = a.x, ay = a.y, az = a.z;
		const bx = b.x, by = b.y, bz = b.z;

		this.x = ay * bz - az * by;
		this.y = az * bx - ax * bz;
		this.z = ax * by - ay * bx;

		return this;

	}

	projectOnVector( v ) {

		const denominator = v.lengthSq();

		if ( denominator === 0 ) return this.set( 0, 0, 0 );

		const scalar = v.dot( this ) / denominator;

		return this.copy( v ).multiplyScalar( scalar );

	}

	projectOnPlane( planeNormal ) {

		_vector$c.copy( this ).projectOnVector( planeNormal );

		return this.sub( _vector$c );

	}

	reflect( normal ) {

		// reflect incident vector off plane orthogonal to normal
		// normal is assumed to have unit length

		return this.sub( _vector$c.copy( normal ).multiplyScalar( 2 * this.dot( normal ) ) );

	}

	angleTo( v ) {

		const denominator = Math.sqrt( this.lengthSq() * v.lengthSq() );

		if ( denominator === 0 ) return Math.PI / 2;

		const theta = this.dot( v ) / denominator;

		// clamp, to handle numerical problems

		return Math.acos( clamp$1( theta, - 1, 1 ) );

	}

	distanceTo( v ) {

		return Math.sqrt( this.distanceToSquared( v ) );

	}

	distanceToSquared( v ) {

		const dx = this.x - v.x, dy = this.y - v.y, dz = this.z - v.z;

		return dx * dx + dy * dy + dz * dz;

	}

	manhattanDistanceTo( v ) {

		return Math.abs( this.x - v.x ) + Math.abs( this.y - v.y ) + Math.abs( this.z - v.z );

	}

	setFromSpherical( s ) {

		return this.setFromSphericalCoords( s.radius, s.phi, s.theta );

	}

	setFromSphericalCoords( radius, phi, theta ) {

		const sinPhiRadius = Math.sin( phi ) * radius;

		this.x = sinPhiRadius * Math.sin( theta );
		this.y = Math.cos( phi ) * radius;
		this.z = sinPhiRadius * Math.cos( theta );

		return this;

	}

	setFromCylindrical( c ) {

		return this.setFromCylindricalCoords( c.radius, c.theta, c.y );

	}

	setFromCylindricalCoords( radius, theta, y ) {

		this.x = radius * Math.sin( theta );
		this.y = y;
		this.z = radius * Math.cos( theta );

		return this;

	}

	setFromMatrixPosition( m ) {

		const e = m.elements;

		this.x = e[ 12 ];
		this.y = e[ 13 ];
		this.z = e[ 14 ];

		return this;

	}

	setFromMatrixScale( m ) {

		const sx = this.setFromMatrixColumn( m, 0 ).length();
		const sy = this.setFromMatrixColumn( m, 1 ).length();
		const sz = this.setFromMatrixColumn( m, 2 ).length();

		this.x = sx;
		this.y = sy;
		this.z = sz;

		return this;

	}

	setFromMatrixColumn( m, index ) {

		return this.fromArray( m.elements, index * 4 );

	}

	setFromMatrix3Column( m, index ) {

		return this.fromArray( m.elements, index * 3 );

	}

	setFromEuler( e ) {

		this.x = e._x;
		this.y = e._y;
		this.z = e._z;

		return this;

	}

	setFromColor( c ) {

		this.x = c.r;
		this.y = c.g;
		this.z = c.b;

		return this;

	}

	equals( v ) {

		return ( ( v.x === this.x ) && ( v.y === this.y ) && ( v.z === this.z ) );

	}

	fromArray( array, offset = 0 ) {

		this.x = array[ offset ];
		this.y = array[ offset + 1 ];
		this.z = array[ offset + 2 ];

		return this;

	}

	toArray( array = [], offset = 0 ) {

		array[ offset ] = this.x;
		array[ offset + 1 ] = this.y;
		array[ offset + 2 ] = this.z;

		return array;

	}

	fromBufferAttribute( attribute, index ) {

		this.x = attribute.getX( index );
		this.y = attribute.getY( index );
		this.z = attribute.getZ( index );

		return this;

	}

	random() {

		this.x = Math.random();
		this.y = Math.random();
		this.z = Math.random();

		return this;

	}

	randomDirection() {

		// https://mathworld.wolfram.com/SpherePointPicking.html

		const theta = Math.random() * Math.PI * 2;
		const u = Math.random() * 2 - 1;
		const c = Math.sqrt( 1 - u * u );

		this.x = c * Math.cos( theta );
		this.y = u;
		this.z = c * Math.sin( theta );

		return this;

	}

	*[ Symbol.iterator ]() {

		yield this.x;
		yield this.y;
		yield this.z;

	}

}

const _vector$c = /*@__PURE__*/ new Vector3();
const _quaternion$4 = /*@__PURE__*/ new Quaternion();

class Box3 {

	constructor( min = new Vector3( + Infinity, + Infinity, + Infinity ), max = new Vector3( - Infinity, - Infinity, - Infinity ) ) {

		this.isBox3 = true;

		this.min = min;
		this.max = max;

	}

	set( min, max ) {

		this.min.copy( min );
		this.max.copy( max );

		return this;

	}

	setFromArray( array ) {

		this.makeEmpty();

		for ( let i = 0, il = array.length; i < il; i += 3 ) {

			this.expandByPoint( _vector$b.fromArray( array, i ) );

		}

		return this;

	}

	setFromBufferAttribute( attribute ) {

		this.makeEmpty();

		for ( let i = 0, il = attribute.count; i < il; i ++ ) {

			this.expandByPoint( _vector$b.fromBufferAttribute( attribute, i ) );

		}

		return this;

	}

	setFromPoints( points ) {

		this.makeEmpty();

		for ( let i = 0, il = points.length; i < il; i ++ ) {

			this.expandByPoint( points[ i ] );

		}

		return this;

	}

	setFromCenterAndSize( center, size ) {

		const halfSize = _vector$b.copy( size ).multiplyScalar( 0.5 );

		this.min.copy( center ).sub( halfSize );
		this.max.copy( center ).add( halfSize );

		return this;

	}

	setFromObject( object, precise = false ) {

		this.makeEmpty();

		return this.expandByObject( object, precise );

	}

	clone() {

		return new this.constructor().copy( this );

	}

	copy( box ) {

		this.min.copy( box.min );
		this.max.copy( box.max );

		return this;

	}

	makeEmpty() {

		this.min.x = this.min.y = this.min.z = + Infinity;
		this.max.x = this.max.y = this.max.z = - Infinity;

		return this;

	}

	isEmpty() {

		// this is a more robust check for empty than ( volume <= 0 ) because volume can get positive with two negative axes

		return ( this.max.x < this.min.x ) || ( this.max.y < this.min.y ) || ( this.max.z < this.min.z );

	}

	getCenter( target ) {

		return this.isEmpty() ? target.set( 0, 0, 0 ) : target.addVectors( this.min, this.max ).multiplyScalar( 0.5 );

	}

	getSize( target ) {

		return this.isEmpty() ? target.set( 0, 0, 0 ) : target.subVectors( this.max, this.min );

	}

	expandByPoint( point ) {

		this.min.min( point );
		this.max.max( point );

		return this;

	}

	expandByVector( vector ) {

		this.min.sub( vector );
		this.max.add( vector );

		return this;

	}

	expandByScalar( scalar ) {

		this.min.addScalar( - scalar );
		this.max.addScalar( scalar );

		return this;

	}

	expandByObject( object, precise = false ) {

		// Computes the world-axis-aligned bounding box of an object (including its children),
		// accounting for both the object's, and children's, world transforms

		object.updateWorldMatrix( false, false );

		const geometry = object.geometry;

		if ( geometry !== undefined ) {

			const positionAttribute = geometry.getAttribute( 'position' );

			// precise AABB computation based on vertex data requires at least a position attribute.
			// instancing isn't supported so far and uses the normal (conservative) code path.

			if ( precise === true && positionAttribute !== undefined && object.isInstancedMesh !== true ) {

				for ( let i = 0, l = positionAttribute.count; i < l; i ++ ) {

					if ( object.isMesh === true ) {

						object.getVertexPosition( i, _vector$b );

					} else {

						_vector$b.fromBufferAttribute( positionAttribute, i );

					}

					_vector$b.applyMatrix4( object.matrixWorld );
					this.expandByPoint( _vector$b );

				}

			} else {

				if ( object.boundingBox !== undefined ) {

					// object-level bounding box

					if ( object.boundingBox === null ) {

						object.computeBoundingBox();

					}

					_box$4.copy( object.boundingBox );


				} else {

					// geometry-level bounding box

					if ( geometry.boundingBox === null ) {

						geometry.computeBoundingBox();

					}

					_box$4.copy( geometry.boundingBox );

				}

				_box$4.applyMatrix4( object.matrixWorld );

				this.union( _box$4 );

			}

		}

		const children = object.children;

		for ( let i = 0, l = children.length; i < l; i ++ ) {

			this.expandByObject( children[ i ], precise );

		}

		return this;

	}

	containsPoint( point ) {

		return point.x < this.min.x || point.x > this.max.x ||
			point.y < this.min.y || point.y > this.max.y ||
			point.z < this.min.z || point.z > this.max.z ? false : true;

	}

	containsBox( box ) {

		return this.min.x <= box.min.x && box.max.x <= this.max.x &&
			this.min.y <= box.min.y && box.max.y <= this.max.y &&
			this.min.z <= box.min.z && box.max.z <= this.max.z;

	}

	getParameter( point, target ) {

		// This can potentially have a divide by zero if the box
		// has a size dimension of 0.

		return target.set(
			( point.x - this.min.x ) / ( this.max.x - this.min.x ),
			( point.y - this.min.y ) / ( this.max.y - this.min.y ),
			( point.z - this.min.z ) / ( this.max.z - this.min.z )
		);

	}

	intersectsBox( box ) {

		// using 6 splitting planes to rule out intersections.
		return box.max.x < this.min.x || box.min.x > this.max.x ||
			box.max.y < this.min.y || box.min.y > this.max.y ||
			box.max.z < this.min.z || box.min.z > this.max.z ? false : true;

	}

	intersectsSphere( sphere ) {

		// Find the point on the AABB closest to the sphere center.
		this.clampPoint( sphere.center, _vector$b );

		// If that point is inside the sphere, the AABB and sphere intersect.
		return _vector$b.distanceToSquared( sphere.center ) <= ( sphere.radius * sphere.radius );

	}

	intersectsPlane( plane ) {

		// We compute the minimum and maximum dot product values. If those values
		// are on the same side (back or front) of the plane, then there is no intersection.

		let min, max;

		if ( plane.normal.x > 0 ) {

			min = plane.normal.x * this.min.x;
			max = plane.normal.x * this.max.x;

		} else {

			min = plane.normal.x * this.max.x;
			max = plane.normal.x * this.min.x;

		}

		if ( plane.normal.y > 0 ) {

			min += plane.normal.y * this.min.y;
			max += plane.normal.y * this.max.y;

		} else {

			min += plane.normal.y * this.max.y;
			max += plane.normal.y * this.min.y;

		}

		if ( plane.normal.z > 0 ) {

			min += plane.normal.z * this.min.z;
			max += plane.normal.z * this.max.z;

		} else {

			min += plane.normal.z * this.max.z;
			max += plane.normal.z * this.min.z;

		}

		return ( min <= - plane.constant && max >= - plane.constant );

	}

	intersectsTriangle( triangle ) {

		if ( this.isEmpty() ) {

			return false;

		}

		// compute box center and extents
		this.getCenter( _center );
		_extents.subVectors( this.max, _center );

		// translate triangle to aabb origin
		_v0$2.subVectors( triangle.a, _center );
		_v1$7.subVectors( triangle.b, _center );
		_v2$4.subVectors( triangle.c, _center );

		// compute edge vectors for triangle
		_f0.subVectors( _v1$7, _v0$2 );
		_f1.subVectors( _v2$4, _v1$7 );
		_f2.subVectors( _v0$2, _v2$4 );

		// test against axes that are given by cross product combinations of the edges of the triangle and the edges of the aabb
		// make an axis testing of each of the 3 sides of the aabb against each of the 3 sides of the triangle = 9 axis of separation
		// axis_ij = u_i x f_j (u0, u1, u2 = face normals of aabb = x,y,z axes vectors since aabb is axis aligned)
		let axes = [
			0, - _f0.z, _f0.y, 0, - _f1.z, _f1.y, 0, - _f2.z, _f2.y,
			_f0.z, 0, - _f0.x, _f1.z, 0, - _f1.x, _f2.z, 0, - _f2.x,
			- _f0.y, _f0.x, 0, - _f1.y, _f1.x, 0, - _f2.y, _f2.x, 0
		];
		if ( ! satForAxes( axes, _v0$2, _v1$7, _v2$4, _extents ) ) {

			return false;

		}

		// test 3 face normals from the aabb
		axes = [ 1, 0, 0, 0, 1, 0, 0, 0, 1 ];
		if ( ! satForAxes( axes, _v0$2, _v1$7, _v2$4, _extents ) ) {

			return false;

		}

		// finally testing the face normal of the triangle
		// use already existing triangle edge vectors here
		_triangleNormal.crossVectors( _f0, _f1 );
		axes = [ _triangleNormal.x, _triangleNormal.y, _triangleNormal.z ];

		return satForAxes( axes, _v0$2, _v1$7, _v2$4, _extents );

	}

	clampPoint( point, target ) {

		return target.copy( point ).clamp( this.min, this.max );

	}

	distanceToPoint( point ) {

		return this.clampPoint( point, _vector$b ).distanceTo( point );

	}

	getBoundingSphere( target ) {

		if ( this.isEmpty() ) {

			target.makeEmpty();

		} else {

			this.getCenter( target.center );

			target.radius = this.getSize( _vector$b ).length() * 0.5;

		}

		return target;

	}

	intersect( box ) {

		this.min.max( box.min );
		this.max.min( box.max );

		// ensure that if there is no overlap, the result is fully empty, not slightly empty with non-inf/+inf values that will cause subsequence intersects to erroneously return valid values.
		if ( this.isEmpty() ) this.makeEmpty();

		return this;

	}

	union( box ) {

		this.min.min( box.min );
		this.max.max( box.max );

		return this;

	}

	applyMatrix4( matrix ) {

		// transform of empty box is an empty box.
		if ( this.isEmpty() ) return this;

		// NOTE: I am using a binary pattern to specify all 2^3 combinations below
		_points[ 0 ].set( this.min.x, this.min.y, this.min.z ).applyMatrix4( matrix ); // 000
		_points[ 1 ].set( this.min.x, this.min.y, this.max.z ).applyMatrix4( matrix ); // 001
		_points[ 2 ].set( this.min.x, this.max.y, this.min.z ).applyMatrix4( matrix ); // 010
		_points[ 3 ].set( this.min.x, this.max.y, this.max.z ).applyMatrix4( matrix ); // 011
		_points[ 4 ].set( this.max.x, this.min.y, this.min.z ).applyMatrix4( matrix ); // 100
		_points[ 5 ].set( this.max.x, this.min.y, this.max.z ).applyMatrix4( matrix ); // 101
		_points[ 6 ].set( this.max.x, this.max.y, this.min.z ).applyMatrix4( matrix ); // 110
		_points[ 7 ].set( this.max.x, this.max.y, this.max.z ).applyMatrix4( matrix ); // 111

		this.setFromPoints( _points );

		return this;

	}

	translate( offset ) {

		this.min.add( offset );
		this.max.add( offset );

		return this;

	}

	equals( box ) {

		return box.min.equals( this.min ) && box.max.equals( this.max );

	}

}

const _points = [
	/*@__PURE__*/ new Vector3(),
	/*@__PURE__*/ new Vector3(),
	/*@__PURE__*/ new Vector3(),
	/*@__PURE__*/ new Vector3(),
	/*@__PURE__*/ new Vector3(),
	/*@__PURE__*/ new Vector3(),
	/*@__PURE__*/ new Vector3(),
	/*@__PURE__*/ new Vector3()
];

const _vector$b = /*@__PURE__*/ new Vector3();

const _box$4 = /*@__PURE__*/ new Box3();

// triangle centered vertices

const _v0$2 = /*@__PURE__*/ new Vector3();
const _v1$7 = /*@__PURE__*/ new Vector3();
const _v2$4 = /*@__PURE__*/ new Vector3();

// triangle edge vectors

const _f0 = /*@__PURE__*/ new Vector3();
const _f1 = /*@__PURE__*/ new Vector3();
const _f2 = /*@__PURE__*/ new Vector3();

const _center = /*@__PURE__*/ new Vector3();
const _extents = /*@__PURE__*/ new Vector3();
const _triangleNormal = /*@__PURE__*/ new Vector3();
const _testAxis = /*@__PURE__*/ new Vector3();

function satForAxes( axes, v0, v1, v2, extents ) {

	for ( let i = 0, j = axes.length - 3; i <= j; i += 3 ) {

		_testAxis.fromArray( axes, i );
		// project the aabb onto the separating axis
		const r = extents.x * Math.abs( _testAxis.x ) + extents.y * Math.abs( _testAxis.y ) + extents.z * Math.abs( _testAxis.z );
		// project all 3 vertices of the triangle onto the separating axis
		const p0 = v0.dot( _testAxis );
		const p1 = v1.dot( _testAxis );
		const p2 = v2.dot( _testAxis );
		// actual test, basically see if either of the most extreme of the triangle points intersects r
		if ( Math.max( - Math.max( p0, p1, p2 ), Math.min( p0, p1, p2 ) ) > r ) {

			// points of the projected triangle are outside the projected half-length of the aabb
			// the axis is separating and we can exit
			return false;

		}

	}

	return true;

}

const _box$3 = /*@__PURE__*/ new Box3();
const _v1$6 = /*@__PURE__*/ new Vector3();
const _v2$3 = /*@__PURE__*/ new Vector3();

class Sphere {

	constructor( center = new Vector3(), radius = - 1 ) {

		this.isSphere = true;

		this.center = center;
		this.radius = radius;

	}

	set( center, radius ) {

		this.center.copy( center );
		this.radius = radius;

		return this;

	}

	setFromPoints( points, optionalCenter ) {

		const center = this.center;

		if ( optionalCenter !== undefined ) {

			center.copy( optionalCenter );

		} else {

			_box$3.setFromPoints( points ).getCenter( center );

		}

		let maxRadiusSq = 0;

		for ( let i = 0, il = points.length; i < il; i ++ ) {

			maxRadiusSq = Math.max( maxRadiusSq, center.distanceToSquared( points[ i ] ) );

		}

		this.radius = Math.sqrt( maxRadiusSq );

		return this;

	}

	copy( sphere ) {

		this.center.copy( sphere.center );
		this.radius = sphere.radius;

		return this;

	}

	isEmpty() {

		return ( this.radius < 0 );

	}

	makeEmpty() {

		this.center.set( 0, 0, 0 );
		this.radius = - 1;

		return this;

	}

	containsPoint( point ) {

		return ( point.distanceToSquared( this.center ) <= ( this.radius * this.radius ) );

	}

	distanceToPoint( point ) {

		return ( point.distanceTo( this.center ) - this.radius );

	}

	intersectsSphere( sphere ) {

		const radiusSum = this.radius + sphere.radius;

		return sphere.center.distanceToSquared( this.center ) <= ( radiusSum * radiusSum );

	}

	intersectsBox( box ) {

		return box.intersectsSphere( this );

	}

	intersectsPlane( plane ) {

		return Math.abs( plane.distanceToPoint( this.center ) ) <= this.radius;

	}

	clampPoint( point, target ) {

		const deltaLengthSq = this.center.distanceToSquared( point );

		target.copy( point );

		if ( deltaLengthSq > ( this.radius * this.radius ) ) {

			target.sub( this.center ).normalize();
			target.multiplyScalar( this.radius ).add( this.center );

		}

		return target;

	}

	getBoundingBox( target ) {

		if ( this.isEmpty() ) {

			// Empty sphere produces empty bounding box
			target.makeEmpty();
			return target;

		}

		target.set( this.center, this.center );
		target.expandByScalar( this.radius );

		return target;

	}

	applyMatrix4( matrix ) {

		this.center.applyMatrix4( matrix );
		this.radius = this.radius * matrix.getMaxScaleOnAxis();

		return this;

	}

	translate( offset ) {

		this.center.add( offset );

		return this;

	}

	expandByPoint( point ) {

		if ( this.isEmpty() ) {

			this.center.copy( point );

			this.radius = 0;

			return this;

		}

		_v1$6.subVectors( point, this.center );

		const lengthSq = _v1$6.lengthSq();

		if ( lengthSq > ( this.radius * this.radius ) ) {

			// calculate the minimal sphere

			const length = Math.sqrt( lengthSq );

			const delta = ( length - this.radius ) * 0.5;

			this.center.addScaledVector( _v1$6, delta / length );

			this.radius += delta;

		}

		return this;

	}

	union( sphere ) {

		if ( sphere.isEmpty() ) {

			return this;

		}

		if ( this.isEmpty() ) {

			this.copy( sphere );

			return this;

		}

		if ( this.center.equals( sphere.center ) === true ) {

			 this.radius = Math.max( this.radius, sphere.radius );

		} else {

			_v2$3.subVectors( sphere.center, this.center ).setLength( sphere.radius );

			this.expandByPoint( _v1$6.copy( sphere.center ).add( _v2$3 ) );

			this.expandByPoint( _v1$6.copy( sphere.center ).sub( _v2$3 ) );

		}

		return this;

	}

	equals( sphere ) {

		return sphere.center.equals( this.center ) && ( sphere.radius === this.radius );

	}

	clone() {

		return new this.constructor().copy( this );

	}

}

const _vector$a = /*@__PURE__*/ new Vector3();
const _segCenter = /*@__PURE__*/ new Vector3();
const _segDir = /*@__PURE__*/ new Vector3();
const _diff = /*@__PURE__*/ new Vector3();

const _edge1 = /*@__PURE__*/ new Vector3();
const _edge2 = /*@__PURE__*/ new Vector3();
const _normal$2 = /*@__PURE__*/ new Vector3();

class Ray {

	constructor( origin = new Vector3(), direction = new Vector3( 0, 0, - 1 ) ) {

		this.origin = origin;
		this.direction = direction;

	}

	set( origin, direction ) {

		this.origin.copy( origin );
		this.direction.copy( direction );

		return this;

	}

	copy( ray ) {

		this.origin.copy( ray.origin );
		this.direction.copy( ray.direction );

		return this;

	}

	at( t, target ) {

		return target.copy( this.origin ).addScaledVector( this.direction, t );

	}

	lookAt( v ) {

		this.direction.copy( v ).sub( this.origin ).normalize();

		return this;

	}

	recast( t ) {

		this.origin.copy( this.at( t, _vector$a ) );

		return this;

	}

	closestPointToPoint( point, target ) {

		target.subVectors( point, this.origin );

		const directionDistance = target.dot( this.direction );

		if ( directionDistance < 0 ) {

			return target.copy( this.origin );

		}

		return target.copy( this.origin ).addScaledVector( this.direction, directionDistance );

	}

	distanceToPoint( point ) {

		return Math.sqrt( this.distanceSqToPoint( point ) );

	}

	distanceSqToPoint( point ) {

		const directionDistance = _vector$a.subVectors( point, this.origin ).dot( this.direction );

		// point behind the ray

		if ( directionDistance < 0 ) {

			return this.origin.distanceToSquared( point );

		}

		_vector$a.copy( this.origin ).addScaledVector( this.direction, directionDistance );

		return _vector$a.distanceToSquared( point );

	}

	distanceSqToSegment( v0, v1, optionalPointOnRay, optionalPointOnSegment ) {

		// from https://github.com/pmjoniak/GeometricTools/blob/master/GTEngine/Include/Mathematics/GteDistRaySegment.h
		// It returns the min distance between the ray and the segment
		// defined by v0 and v1
		// It can also set two optional targets :
		// - The closest point on the ray
		// - The closest point on the segment

		_segCenter.copy( v0 ).add( v1 ).multiplyScalar( 0.5 );
		_segDir.copy( v1 ).sub( v0 ).normalize();
		_diff.copy( this.origin ).sub( _segCenter );

		const segExtent = v0.distanceTo( v1 ) * 0.5;
		const a01 = - this.direction.dot( _segDir );
		const b0 = _diff.dot( this.direction );
		const b1 = - _diff.dot( _segDir );
		const c = _diff.lengthSq();
		const det = Math.abs( 1 - a01 * a01 );
		let s0, s1, sqrDist, extDet;

		if ( det > 0 ) {

			// The ray and segment are not parallel.

			s0 = a01 * b1 - b0;
			s1 = a01 * b0 - b1;
			extDet = segExtent * det;

			if ( s0 >= 0 ) {

				if ( s1 >= - extDet ) {

					if ( s1 <= extDet ) {

						// region 0
						// Minimum at interior points of ray and segment.

						const invDet = 1 / det;
						s0 *= invDet;
						s1 *= invDet;
						sqrDist = s0 * ( s0 + a01 * s1 + 2 * b0 ) + s1 * ( a01 * s0 + s1 + 2 * b1 ) + c;

					} else {

						// region 1

						s1 = segExtent;
						s0 = Math.max( 0, - ( a01 * s1 + b0 ) );
						sqrDist = - s0 * s0 + s1 * ( s1 + 2 * b1 ) + c;

					}

				} else {

					// region 5

					s1 = - segExtent;
					s0 = Math.max( 0, - ( a01 * s1 + b0 ) );
					sqrDist = - s0 * s0 + s1 * ( s1 + 2 * b1 ) + c;

				}

			} else {

				if ( s1 <= - extDet ) {

					// region 4

					s0 = Math.max( 0, - ( - a01 * segExtent + b0 ) );
					s1 = ( s0 > 0 ) ? - segExtent : Math.min( Math.max( - segExtent, - b1 ), segExtent );
					sqrDist = - s0 * s0 + s1 * ( s1 + 2 * b1 ) + c;

				} else if ( s1 <= extDet ) {

					// region 3

					s0 = 0;
					s1 = Math.min( Math.max( - segExtent, - b1 ), segExtent );
					sqrDist = s1 * ( s1 + 2 * b1 ) + c;

				} else {

					// region 2

					s0 = Math.max( 0, - ( a01 * segExtent + b0 ) );
					s1 = ( s0 > 0 ) ? segExtent : Math.min( Math.max( - segExtent, - b1 ), segExtent );
					sqrDist = - s0 * s0 + s1 * ( s1 + 2 * b1 ) + c;

				}

			}

		} else {

			// Ray and segment are parallel.

			s1 = ( a01 > 0 ) ? - segExtent : segExtent;
			s0 = Math.max( 0, - ( a01 * s1 + b0 ) );
			sqrDist = - s0 * s0 + s1 * ( s1 + 2 * b1 ) + c;

		}

		if ( optionalPointOnRay ) {

			optionalPointOnRay.copy( this.origin ).addScaledVector( this.direction, s0 );

		}

		if ( optionalPointOnSegment ) {

			optionalPointOnSegment.copy( _segCenter ).addScaledVector( _segDir, s1 );

		}

		return sqrDist;

	}

	intersectSphere( sphere, target ) {

		_vector$a.subVectors( sphere.center, this.origin );
		const tca = _vector$a.dot( this.direction );
		const d2 = _vector$a.dot( _vector$a ) - tca * tca;
		const radius2 = sphere.radius * sphere.radius;

		if ( d2 > radius2 ) return null;

		const thc = Math.sqrt( radius2 - d2 );

		// t0 = first intersect point - entrance on front of sphere
		const t0 = tca - thc;

		// t1 = second intersect point - exit point on back of sphere
		const t1 = tca + thc;

		// test to see if t1 is behind the ray - if so, return null
		if ( t1 < 0 ) return null;

		// test to see if t0 is behind the ray:
		// if it is, the ray is inside the sphere, so return the second exit point scaled by t1,
		// in order to always return an intersect point that is in front of the ray.
		if ( t0 < 0 ) return this.at( t1, target );

		// else t0 is in front of the ray, so return the first collision point scaled by t0
		return this.at( t0, target );

	}

	intersectsSphere( sphere ) {

		return this.distanceSqToPoint( sphere.center ) <= ( sphere.radius * sphere.radius );

	}

	distanceToPlane( plane ) {

		const denominator = plane.normal.dot( this.direction );

		if ( denominator === 0 ) {

			// line is coplanar, return origin
			if ( plane.distanceToPoint( this.origin ) === 0 ) {

				return 0;

			}

			// Null is preferable to undefined since undefined means.... it is undefined

			return null;

		}

		const t = - ( this.origin.dot( plane.normal ) + plane.constant ) / denominator;

		// Return if the ray never intersects the plane

		return t >= 0 ? t : null;

	}

	intersectPlane( plane, target ) {

		const t = this.distanceToPlane( plane );

		if ( t === null ) {

			return null;

		}

		return this.at( t, target );

	}

	intersectsPlane( plane ) {

		// check if the ray lies on the plane first

		const distToPoint = plane.distanceToPoint( this.origin );

		if ( distToPoint === 0 ) {

			return true;

		}

		const denominator = plane.normal.dot( this.direction );

		if ( denominator * distToPoint < 0 ) {

			return true;

		}

		// ray origin is behind the plane (and is pointing behind it)

		return false;

	}

	intersectBox( box, target ) {

		let tmin, tmax, tymin, tymax, tzmin, tzmax;

		const invdirx = 1 / this.direction.x,
			invdiry = 1 / this.direction.y,
			invdirz = 1 / this.direction.z;

		const origin = this.origin;

		if ( invdirx >= 0 ) {

			tmin = ( box.min.x - origin.x ) * invdirx;
			tmax = ( box.max.x - origin.x ) * invdirx;

		} else {

			tmin = ( box.max.x - origin.x ) * invdirx;
			tmax = ( box.min.x - origin.x ) * invdirx;

		}

		if ( invdiry >= 0 ) {

			tymin = ( box.min.y - origin.y ) * invdiry;
			tymax = ( box.max.y - origin.y ) * invdiry;

		} else {

			tymin = ( box.max.y - origin.y ) * invdiry;
			tymax = ( box.min.y - origin.y ) * invdiry;

		}

		if ( ( tmin > tymax ) || ( tymin > tmax ) ) return null;

		if ( tymin > tmin || isNaN( tmin ) ) tmin = tymin;

		if ( tymax < tmax || isNaN( tmax ) ) tmax = tymax;

		if ( invdirz >= 0 ) {

			tzmin = ( box.min.z - origin.z ) * invdirz;
			tzmax = ( box.max.z - origin.z ) * invdirz;

		} else {

			tzmin = ( box.max.z - origin.z ) * invdirz;
			tzmax = ( box.min.z - origin.z ) * invdirz;

		}

		if ( ( tmin > tzmax ) || ( tzmin > tmax ) ) return null;

		if ( tzmin > tmin || tmin !== tmin ) tmin = tzmin;

		if ( tzmax < tmax || tmax !== tmax ) tmax = tzmax;

		//return point closest to the ray (positive side)

		if ( tmax < 0 ) return null;

		return this.at( tmin >= 0 ? tmin : tmax, target );

	}

	intersectsBox( box ) {

		return this.intersectBox( box, _vector$a ) !== null;

	}

	intersectTriangle( a, b, c, backfaceCulling, target ) {

		// Compute the offset origin, edges, and normal.

		// from https://github.com/pmjoniak/GeometricTools/blob/master/GTEngine/Include/Mathematics/GteIntrRay3Triangle3.h

		_edge1.subVectors( b, a );
		_edge2.subVectors( c, a );
		_normal$2.crossVectors( _edge1, _edge2 );

		// Solve Q + t*D = b1*E1 + b2*E2 (Q = kDiff, D = ray direction,
		// E1 = kEdge1, E2 = kEdge2, N = Cross(E1,E2)) by
		//   |Dot(D,N)|*b1 = sign(Dot(D,N))*Dot(D,Cross(Q,E2))
		//   |Dot(D,N)|*b2 = sign(Dot(D,N))*Dot(D,Cross(E1,Q))
		//   |Dot(D,N)|*t = -sign(Dot(D,N))*Dot(Q,N)
		let DdN = this.direction.dot( _normal$2 );
		let sign;

		if ( DdN > 0 ) {

			if ( backfaceCulling ) return null;
			sign = 1;

		} else if ( DdN < 0 ) {

			sign = - 1;
			DdN = - DdN;

		} else {

			return null;

		}

		_diff.subVectors( this.origin, a );
		const DdQxE2 = sign * this.direction.dot( _edge2.crossVectors( _diff, _edge2 ) );

		// b1 < 0, no intersection
		if ( DdQxE2 < 0 ) {

			return null;

		}

		const DdE1xQ = sign * this.direction.dot( _edge1.cross( _diff ) );

		// b2 < 0, no intersection
		if ( DdE1xQ < 0 ) {

			return null;

		}

		// b1+b2 > 1, no intersection
		if ( DdQxE2 + DdE1xQ > DdN ) {

			return null;

		}

		// Line intersects triangle, check if ray does.
		const QdN = - sign * _diff.dot( _normal$2 );

		// t < 0, no intersection
		if ( QdN < 0 ) {

			return null;

		}

		// Ray intersects triangle.
		return this.at( QdN / DdN, target );

	}

	applyMatrix4( matrix4 ) {

		this.origin.applyMatrix4( matrix4 );
		this.direction.transformDirection( matrix4 );

		return this;

	}

	equals( ray ) {

		return ray.origin.equals( this.origin ) && ray.direction.equals( this.direction );

	}

	clone() {

		return new this.constructor().copy( this );

	}

}

class Matrix4 {

	constructor( n11, n12, n13, n14, n21, n22, n23, n24, n31, n32, n33, n34, n41, n42, n43, n44 ) {

		Matrix4.prototype.isMatrix4 = true;

		this.elements = [

			1, 0, 0, 0,
			0, 1, 0, 0,
			0, 0, 1, 0,
			0, 0, 0, 1

		];

		if ( n11 !== undefined ) {

			this.set( n11, n12, n13, n14, n21, n22, n23, n24, n31, n32, n33, n34, n41, n42, n43, n44 );

		}

	}

	set( n11, n12, n13, n14, n21, n22, n23, n24, n31, n32, n33, n34, n41, n42, n43, n44 ) {

		const te = this.elements;

		te[ 0 ] = n11; te[ 4 ] = n12; te[ 8 ] = n13; te[ 12 ] = n14;
		te[ 1 ] = n21; te[ 5 ] = n22; te[ 9 ] = n23; te[ 13 ] = n24;
		te[ 2 ] = n31; te[ 6 ] = n32; te[ 10 ] = n33; te[ 14 ] = n34;
		te[ 3 ] = n41; te[ 7 ] = n42; te[ 11 ] = n43; te[ 15 ] = n44;

		return this;

	}

	identity() {

		this.set(

			1, 0, 0, 0,
			0, 1, 0, 0,
			0, 0, 1, 0,
			0, 0, 0, 1

		);

		return this;

	}

	clone() {

		return new Matrix4().fromArray( this.elements );

	}

	copy( m ) {

		const te = this.elements;
		const me = m.elements;

		te[ 0 ] = me[ 0 ]; te[ 1 ] = me[ 1 ]; te[ 2 ] = me[ 2 ]; te[ 3 ] = me[ 3 ];
		te[ 4 ] = me[ 4 ]; te[ 5 ] = me[ 5 ]; te[ 6 ] = me[ 6 ]; te[ 7 ] = me[ 7 ];
		te[ 8 ] = me[ 8 ]; te[ 9 ] = me[ 9 ]; te[ 10 ] = me[ 10 ]; te[ 11 ] = me[ 11 ];
		te[ 12 ] = me[ 12 ]; te[ 13 ] = me[ 13 ]; te[ 14 ] = me[ 14 ]; te[ 15 ] = me[ 15 ];

		return this;

	}

	copyPosition( m ) {

		const te = this.elements, me = m.elements;

		te[ 12 ] = me[ 12 ];
		te[ 13 ] = me[ 13 ];
		te[ 14 ] = me[ 14 ];

		return this;

	}

	setFromMatrix3( m ) {

		const me = m.elements;

		this.set(

			me[ 0 ], me[ 3 ], me[ 6 ], 0,
			me[ 1 ], me[ 4 ], me[ 7 ], 0,
			me[ 2 ], me[ 5 ], me[ 8 ], 0,
			0, 0, 0, 1

		);

		return this;

	}

	extractBasis( xAxis, yAxis, zAxis ) {

		xAxis.setFromMatrixColumn( this, 0 );
		yAxis.setFromMatrixColumn( this, 1 );
		zAxis.setFromMatrixColumn( this, 2 );

		return this;

	}

	makeBasis( xAxis, yAxis, zAxis ) {

		this.set(
			xAxis.x, yAxis.x, zAxis.x, 0,
			xAxis.y, yAxis.y, zAxis.y, 0,
			xAxis.z, yAxis.z, zAxis.z, 0,
			0, 0, 0, 1
		);

		return this;

	}

	extractRotation( m ) {

		// this method does not support reflection matrices

		const te = this.elements;
		const me = m.elements;

		const scaleX = 1 / _v1$5.setFromMatrixColumn( m, 0 ).length();
		const scaleY = 1 / _v1$5.setFromMatrixColumn( m, 1 ).length();
		const scaleZ = 1 / _v1$5.setFromMatrixColumn( m, 2 ).length();

		te[ 0 ] = me[ 0 ] * scaleX;
		te[ 1 ] = me[ 1 ] * scaleX;
		te[ 2 ] = me[ 2 ] * scaleX;
		te[ 3 ] = 0;

		te[ 4 ] = me[ 4 ] * scaleY;
		te[ 5 ] = me[ 5 ] * scaleY;
		te[ 6 ] = me[ 6 ] * scaleY;
		te[ 7 ] = 0;

		te[ 8 ] = me[ 8 ] * scaleZ;
		te[ 9 ] = me[ 9 ] * scaleZ;
		te[ 10 ] = me[ 10 ] * scaleZ;
		te[ 11 ] = 0;

		te[ 12 ] = 0;
		te[ 13 ] = 0;
		te[ 14 ] = 0;
		te[ 15 ] = 1;

		return this;

	}

	makeRotationFromEuler( euler ) {

		const te = this.elements;

		const x = euler.x, y = euler.y, z = euler.z;
		const a = Math.cos( x ), b = Math.sin( x );
		const c = Math.cos( y ), d = Math.sin( y );
		const e = Math.cos( z ), f = Math.sin( z );

		if ( euler.order === 'XYZ' ) {

			const ae = a * e, af = a * f, be = b * e, bf = b * f;

			te[ 0 ] = c * e;
			te[ 4 ] = - c * f;
			te[ 8 ] = d;

			te[ 1 ] = af + be * d;
			te[ 5 ] = ae - bf * d;
			te[ 9 ] = - b * c;

			te[ 2 ] = bf - ae * d;
			te[ 6 ] = be + af * d;
			te[ 10 ] = a * c;

		} else if ( euler.order === 'YXZ' ) {

			const ce = c * e, cf = c * f, de = d * e, df = d * f;

			te[ 0 ] = ce + df * b;
			te[ 4 ] = de * b - cf;
			te[ 8 ] = a * d;

			te[ 1 ] = a * f;
			te[ 5 ] = a * e;
			te[ 9 ] = - b;

			te[ 2 ] = cf * b - de;
			te[ 6 ] = df + ce * b;
			te[ 10 ] = a * c;

		} else if ( euler.order === 'ZXY' ) {

			const ce = c * e, cf = c * f, de = d * e, df = d * f;

			te[ 0 ] = ce - df * b;
			te[ 4 ] = - a * f;
			te[ 8 ] = de + cf * b;

			te[ 1 ] = cf + de * b;
			te[ 5 ] = a * e;
			te[ 9 ] = df - ce * b;

			te[ 2 ] = - a * d;
			te[ 6 ] = b;
			te[ 10 ] = a * c;

		} else if ( euler.order === 'ZYX' ) {

			const ae = a * e, af = a * f, be = b * e, bf = b * f;

			te[ 0 ] = c * e;
			te[ 4 ] = be * d - af;
			te[ 8 ] = ae * d + bf;

			te[ 1 ] = c * f;
			te[ 5 ] = bf * d + ae;
			te[ 9 ] = af * d - be;

			te[ 2 ] = - d;
			te[ 6 ] = b * c;
			te[ 10 ] = a * c;

		} else if ( euler.order === 'YZX' ) {

			const ac = a * c, ad = a * d, bc = b * c, bd = b * d;

			te[ 0 ] = c * e;
			te[ 4 ] = bd - ac * f;
			te[ 8 ] = bc * f + ad;

			te[ 1 ] = f;
			te[ 5 ] = a * e;
			te[ 9 ] = - b * e;

			te[ 2 ] = - d * e;
			te[ 6 ] = ad * f + bc;
			te[ 10 ] = ac - bd * f;

		} else if ( euler.order === 'XZY' ) {

			const ac = a * c, ad = a * d, bc = b * c, bd = b * d;

			te[ 0 ] = c * e;
			te[ 4 ] = - f;
			te[ 8 ] = d * e;

			te[ 1 ] = ac * f + bd;
			te[ 5 ] = a * e;
			te[ 9 ] = ad * f - bc;

			te[ 2 ] = bc * f - ad;
			te[ 6 ] = b * e;
			te[ 10 ] = bd * f + ac;

		}

		// bottom row
		te[ 3 ] = 0;
		te[ 7 ] = 0;
		te[ 11 ] = 0;

		// last column
		te[ 12 ] = 0;
		te[ 13 ] = 0;
		te[ 14 ] = 0;
		te[ 15 ] = 1;

		return this;

	}

	makeRotationFromQuaternion( q ) {

		return this.compose( _zero, q, _one );

	}

	lookAt( eye, target, up ) {

		const te = this.elements;

		_z.subVectors( eye, target );

		if ( _z.lengthSq() === 0 ) {

			// eye and target are in the same position

			_z.z = 1;

		}

		_z.normalize();
		_x.crossVectors( up, _z );

		if ( _x.lengthSq() === 0 ) {

			// up and z are parallel

			if ( Math.abs( up.z ) === 1 ) {

				_z.x += 0.0001;

			} else {

				_z.z += 0.0001;

			}

			_z.normalize();
			_x.crossVectors( up, _z );

		}

		_x.normalize();
		_y.crossVectors( _z, _x );

		te[ 0 ] = _x.x; te[ 4 ] = _y.x; te[ 8 ] = _z.x;
		te[ 1 ] = _x.y; te[ 5 ] = _y.y; te[ 9 ] = _z.y;
		te[ 2 ] = _x.z; te[ 6 ] = _y.z; te[ 10 ] = _z.z;

		return this;

	}

	multiply( m ) {

		return this.multiplyMatrices( this, m );

	}

	premultiply( m ) {

		return this.multiplyMatrices( m, this );

	}

	multiplyMatrices( a, b ) {

		const ae = a.elements;
		const be = b.elements;
		const te = this.elements;

		const a11 = ae[ 0 ], a12 = ae[ 4 ], a13 = ae[ 8 ], a14 = ae[ 12 ];
		const a21 = ae[ 1 ], a22 = ae[ 5 ], a23 = ae[ 9 ], a24 = ae[ 13 ];
		const a31 = ae[ 2 ], a32 = ae[ 6 ], a33 = ae[ 10 ], a34 = ae[ 14 ];
		const a41 = ae[ 3 ], a42 = ae[ 7 ], a43 = ae[ 11 ], a44 = ae[ 15 ];

		const b11 = be[ 0 ], b12 = be[ 4 ], b13 = be[ 8 ], b14 = be[ 12 ];
		const b21 = be[ 1 ], b22 = be[ 5 ], b23 = be[ 9 ], b24 = be[ 13 ];
		const b31 = be[ 2 ], b32 = be[ 6 ], b33 = be[ 10 ], b34 = be[ 14 ];
		const b41 = be[ 3 ], b42 = be[ 7 ], b43 = be[ 11 ], b44 = be[ 15 ];

		te[ 0 ] = a11 * b11 + a12 * b21 + a13 * b31 + a14 * b41;
		te[ 4 ] = a11 * b12 + a12 * b22 + a13 * b32 + a14 * b42;
		te[ 8 ] = a11 * b13 + a12 * b23 + a13 * b33 + a14 * b43;
		te[ 12 ] = a11 * b14 + a12 * b24 + a13 * b34 + a14 * b44;

		te[ 1 ] = a21 * b11 + a22 * b21 + a23 * b31 + a24 * b41;
		te[ 5 ] = a21 * b12 + a22 * b22 + a23 * b32 + a24 * b42;
		te[ 9 ] = a21 * b13 + a22 * b23 + a23 * b33 + a24 * b43;
		te[ 13 ] = a21 * b14 + a22 * b24 + a23 * b34 + a24 * b44;

		te[ 2 ] = a31 * b11 + a32 * b21 + a33 * b31 + a34 * b41;
		te[ 6 ] = a31 * b12 + a32 * b22 + a33 * b32 + a34 * b42;
		te[ 10 ] = a31 * b13 + a32 * b23 + a33 * b33 + a34 * b43;
		te[ 14 ] = a31 * b14 + a32 * b24 + a33 * b34 + a34 * b44;

		te[ 3 ] = a41 * b11 + a42 * b21 + a43 * b31 + a44 * b41;
		te[ 7 ] = a41 * b12 + a42 * b22 + a43 * b32 + a44 * b42;
		te[ 11 ] = a41 * b13 + a42 * b23 + a43 * b33 + a44 * b43;
		te[ 15 ] = a41 * b14 + a42 * b24 + a43 * b34 + a44 * b44;

		return this;

	}

	multiplyScalar( s ) {

		const te = this.elements;

		te[ 0 ] *= s; te[ 4 ] *= s; te[ 8 ] *= s; te[ 12 ] *= s;
		te[ 1 ] *= s; te[ 5 ] *= s; te[ 9 ] *= s; te[ 13 ] *= s;
		te[ 2 ] *= s; te[ 6 ] *= s; te[ 10 ] *= s; te[ 14 ] *= s;
		te[ 3 ] *= s; te[ 7 ] *= s; te[ 11 ] *= s; te[ 15 ] *= s;

		return this;

	}

	determinant() {

		const te = this.elements;

		const n11 = te[ 0 ], n12 = te[ 4 ], n13 = te[ 8 ], n14 = te[ 12 ];
		const n21 = te[ 1 ], n22 = te[ 5 ], n23 = te[ 9 ], n24 = te[ 13 ];
		const n31 = te[ 2 ], n32 = te[ 6 ], n33 = te[ 10 ], n34 = te[ 14 ];
		const n41 = te[ 3 ], n42 = te[ 7 ], n43 = te[ 11 ], n44 = te[ 15 ];

		//TODO: make this more efficient
		//( based on http://www.euclideanspace.com/maths/algebra/matrix/functions/inverse/fourD/index.htm )

		return (
			n41 * (
				+ n14 * n23 * n32
				 - n13 * n24 * n32
				 - n14 * n22 * n33
				 + n12 * n24 * n33
				 + n13 * n22 * n34
				 - n12 * n23 * n34
			) +
			n42 * (
				+ n11 * n23 * n34
				 - n11 * n24 * n33
				 + n14 * n21 * n33
				 - n13 * n21 * n34
				 + n13 * n24 * n31
				 - n14 * n23 * n31
			) +
			n43 * (
				+ n11 * n24 * n32
				 - n11 * n22 * n34
				 - n14 * n21 * n32
				 + n12 * n21 * n34
				 + n14 * n22 * n31
				 - n12 * n24 * n31
			) +
			n44 * (
				- n13 * n22 * n31
				 - n11 * n23 * n32
				 + n11 * n22 * n33
				 + n13 * n21 * n32
				 - n12 * n21 * n33
				 + n12 * n23 * n31
			)

		);

	}

	transpose() {

		const te = this.elements;
		let tmp;

		tmp = te[ 1 ]; te[ 1 ] = te[ 4 ]; te[ 4 ] = tmp;
		tmp = te[ 2 ]; te[ 2 ] = te[ 8 ]; te[ 8 ] = tmp;
		tmp = te[ 6 ]; te[ 6 ] = te[ 9 ]; te[ 9 ] = tmp;

		tmp = te[ 3 ]; te[ 3 ] = te[ 12 ]; te[ 12 ] = tmp;
		tmp = te[ 7 ]; te[ 7 ] = te[ 13 ]; te[ 13 ] = tmp;
		tmp = te[ 11 ]; te[ 11 ] = te[ 14 ]; te[ 14 ] = tmp;

		return this;

	}

	setPosition( x, y, z ) {

		const te = this.elements;

		if ( x.isVector3 ) {

			te[ 12 ] = x.x;
			te[ 13 ] = x.y;
			te[ 14 ] = x.z;

		} else {

			te[ 12 ] = x;
			te[ 13 ] = y;
			te[ 14 ] = z;

		}

		return this;

	}

	invert() {

		// based on http://www.euclideanspace.com/maths/algebra/matrix/functions/inverse/fourD/index.htm
		const te = this.elements,

			n11 = te[ 0 ], n21 = te[ 1 ], n31 = te[ 2 ], n41 = te[ 3 ],
			n12 = te[ 4 ], n22 = te[ 5 ], n32 = te[ 6 ], n42 = te[ 7 ],
			n13 = te[ 8 ], n23 = te[ 9 ], n33 = te[ 10 ], n43 = te[ 11 ],
			n14 = te[ 12 ], n24 = te[ 13 ], n34 = te[ 14 ], n44 = te[ 15 ],

			t11 = n23 * n34 * n42 - n24 * n33 * n42 + n24 * n32 * n43 - n22 * n34 * n43 - n23 * n32 * n44 + n22 * n33 * n44,
			t12 = n14 * n33 * n42 - n13 * n34 * n42 - n14 * n32 * n43 + n12 * n34 * n43 + n13 * n32 * n44 - n12 * n33 * n44,
			t13 = n13 * n24 * n42 - n14 * n23 * n42 + n14 * n22 * n43 - n12 * n24 * n43 - n13 * n22 * n44 + n12 * n23 * n44,
			t14 = n14 * n23 * n32 - n13 * n24 * n32 - n14 * n22 * n33 + n12 * n24 * n33 + n13 * n22 * n34 - n12 * n23 * n34;

		const det = n11 * t11 + n21 * t12 + n31 * t13 + n41 * t14;

		if ( det === 0 ) return this.set( 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 );

		const detInv = 1 / det;

		te[ 0 ] = t11 * detInv;
		te[ 1 ] = ( n24 * n33 * n41 - n23 * n34 * n41 - n24 * n31 * n43 + n21 * n34 * n43 + n23 * n31 * n44 - n21 * n33 * n44 ) * detInv;
		te[ 2 ] = ( n22 * n34 * n41 - n24 * n32 * n41 + n24 * n31 * n42 - n21 * n34 * n42 - n22 * n31 * n44 + n21 * n32 * n44 ) * detInv;
		te[ 3 ] = ( n23 * n32 * n41 - n22 * n33 * n41 - n23 * n31 * n42 + n21 * n33 * n42 + n22 * n31 * n43 - n21 * n32 * n43 ) * detInv;

		te[ 4 ] = t12 * detInv;
		te[ 5 ] = ( n13 * n34 * n41 - n14 * n33 * n41 + n14 * n31 * n43 - n11 * n34 * n43 - n13 * n31 * n44 + n11 * n33 * n44 ) * detInv;
		te[ 6 ] = ( n14 * n32 * n41 - n12 * n34 * n41 - n14 * n31 * n42 + n11 * n34 * n42 + n12 * n31 * n44 - n11 * n32 * n44 ) * detInv;
		te[ 7 ] = ( n12 * n33 * n41 - n13 * n32 * n41 + n13 * n31 * n42 - n11 * n33 * n42 - n12 * n31 * n43 + n11 * n32 * n43 ) * detInv;

		te[ 8 ] = t13 * detInv;
		te[ 9 ] = ( n14 * n23 * n41 - n13 * n24 * n41 - n14 * n21 * n43 + n11 * n24 * n43 + n13 * n21 * n44 - n11 * n23 * n44 ) * detInv;
		te[ 10 ] = ( n12 * n24 * n41 - n14 * n22 * n41 + n14 * n21 * n42 - n11 * n24 * n42 - n12 * n21 * n44 + n11 * n22 * n44 ) * detInv;
		te[ 11 ] = ( n13 * n22 * n41 - n12 * n23 * n41 - n13 * n21 * n42 + n11 * n23 * n42 + n12 * n21 * n43 - n11 * n22 * n43 ) * detInv;

		te[ 12 ] = t14 * detInv;
		te[ 13 ] = ( n13 * n24 * n31 - n14 * n23 * n31 + n14 * n21 * n33 - n11 * n24 * n33 - n13 * n21 * n34 + n11 * n23 * n34 ) * detInv;
		te[ 14 ] = ( n14 * n22 * n31 - n12 * n24 * n31 - n14 * n21 * n32 + n11 * n24 * n32 + n12 * n21 * n34 - n11 * n22 * n34 ) * detInv;
		te[ 15 ] = ( n12 * n23 * n31 - n13 * n22 * n31 + n13 * n21 * n32 - n11 * n23 * n32 - n12 * n21 * n33 + n11 * n22 * n33 ) * detInv;

		return this;

	}

	scale( v ) {

		const te = this.elements;
		const x = v.x, y = v.y, z = v.z;

		te[ 0 ] *= x; te[ 4 ] *= y; te[ 8 ] *= z;
		te[ 1 ] *= x; te[ 5 ] *= y; te[ 9 ] *= z;
		te[ 2 ] *= x; te[ 6 ] *= y; te[ 10 ] *= z;
		te[ 3 ] *= x; te[ 7 ] *= y; te[ 11 ] *= z;

		return this;

	}

	getMaxScaleOnAxis() {

		const te = this.elements;

		const scaleXSq = te[ 0 ] * te[ 0 ] + te[ 1 ] * te[ 1 ] + te[ 2 ] * te[ 2 ];
		const scaleYSq = te[ 4 ] * te[ 4 ] + te[ 5 ] * te[ 5 ] + te[ 6 ] * te[ 6 ];
		const scaleZSq = te[ 8 ] * te[ 8 ] + te[ 9 ] * te[ 9 ] + te[ 10 ] * te[ 10 ];

		return Math.sqrt( Math.max( scaleXSq, scaleYSq, scaleZSq ) );

	}

	makeTranslation( x, y, z ) {

		if ( x.isVector3 ) {

			this.set(

				1, 0, 0, x.x,
				0, 1, 0, x.y,
				0, 0, 1, x.z,
				0, 0, 0, 1

			);

		} else {

			this.set(

				1, 0, 0, x,
				0, 1, 0, y,
				0, 0, 1, z,
				0, 0, 0, 1

			);

		}

		return this;

	}

	makeRotationX( theta ) {

		const c = Math.cos( theta ), s = Math.sin( theta );

		this.set(

			1, 0, 0, 0,
			0, c, - s, 0,
			0, s, c, 0,
			0, 0, 0, 1

		);

		return this;

	}

	makeRotationY( theta ) {

		const c = Math.cos( theta ), s = Math.sin( theta );

		this.set(

			 c, 0, s, 0,
			 0, 1, 0, 0,
			- s, 0, c, 0,
			 0, 0, 0, 1

		);

		return this;

	}

	makeRotationZ( theta ) {

		const c = Math.cos( theta ), s = Math.sin( theta );

		this.set(

			c, - s, 0, 0,
			s, c, 0, 0,
			0, 0, 1, 0,
			0, 0, 0, 1

		);

		return this;

	}

	makeRotationAxis( axis, angle ) {

		// Based on http://www.gamedev.net/reference/articles/article1199.asp

		const c = Math.cos( angle );
		const s = Math.sin( angle );
		const t = 1 - c;
		const x = axis.x, y = axis.y, z = axis.z;
		const tx = t * x, ty = t * y;

		this.set(

			tx * x + c, tx * y - s * z, tx * z + s * y, 0,
			tx * y + s * z, ty * y + c, ty * z - s * x, 0,
			tx * z - s * y, ty * z + s * x, t * z * z + c, 0,
			0, 0, 0, 1

		);

		return this;

	}

	makeScale( x, y, z ) {

		this.set(

			x, 0, 0, 0,
			0, y, 0, 0,
			0, 0, z, 0,
			0, 0, 0, 1

		);

		return this;

	}

	makeShear( xy, xz, yx, yz, zx, zy ) {

		this.set(

			1, yx, zx, 0,
			xy, 1, zy, 0,
			xz, yz, 1, 0,
			0, 0, 0, 1

		);

		return this;

	}

	compose( position, quaternion, scale ) {

		const te = this.elements;

		const x = quaternion._x, y = quaternion._y, z = quaternion._z, w = quaternion._w;
		const x2 = x + x,	y2 = y + y, z2 = z + z;
		const xx = x * x2, xy = x * y2, xz = x * z2;
		const yy = y * y2, yz = y * z2, zz = z * z2;
		const wx = w * x2, wy = w * y2, wz = w * z2;

		const sx = scale.x, sy = scale.y, sz = scale.z;

		te[ 0 ] = ( 1 - ( yy + zz ) ) * sx;
		te[ 1 ] = ( xy + wz ) * sx;
		te[ 2 ] = ( xz - wy ) * sx;
		te[ 3 ] = 0;

		te[ 4 ] = ( xy - wz ) * sy;
		te[ 5 ] = ( 1 - ( xx + zz ) ) * sy;
		te[ 6 ] = ( yz + wx ) * sy;
		te[ 7 ] = 0;

		te[ 8 ] = ( xz + wy ) * sz;
		te[ 9 ] = ( yz - wx ) * sz;
		te[ 10 ] = ( 1 - ( xx + yy ) ) * sz;
		te[ 11 ] = 0;

		te[ 12 ] = position.x;
		te[ 13 ] = position.y;
		te[ 14 ] = position.z;
		te[ 15 ] = 1;

		return this;

	}

	decompose( position, quaternion, scale ) {

		const te = this.elements;

		let sx = _v1$5.set( te[ 0 ], te[ 1 ], te[ 2 ] ).length();
		const sy = _v1$5.set( te[ 4 ], te[ 5 ], te[ 6 ] ).length();
		const sz = _v1$5.set( te[ 8 ], te[ 9 ], te[ 10 ] ).length();

		// if determine is negative, we need to invert one scale
		const det = this.determinant();
		if ( det < 0 ) sx = - sx;

		position.x = te[ 12 ];
		position.y = te[ 13 ];
		position.z = te[ 14 ];

		// scale the rotation part
		_m1$2.copy( this );

		const invSX = 1 / sx;
		const invSY = 1 / sy;
		const invSZ = 1 / sz;

		_m1$2.elements[ 0 ] *= invSX;
		_m1$2.elements[ 1 ] *= invSX;
		_m1$2.elements[ 2 ] *= invSX;

		_m1$2.elements[ 4 ] *= invSY;
		_m1$2.elements[ 5 ] *= invSY;
		_m1$2.elements[ 6 ] *= invSY;

		_m1$2.elements[ 8 ] *= invSZ;
		_m1$2.elements[ 9 ] *= invSZ;
		_m1$2.elements[ 10 ] *= invSZ;

		quaternion.setFromRotationMatrix( _m1$2 );

		scale.x = sx;
		scale.y = sy;
		scale.z = sz;

		return this;

	}

	makePerspective( left, right, top, bottom, near, far, coordinateSystem = WebGLCoordinateSystem ) {

		const te = this.elements;
		const x = 2 * near / ( right - left );
		const y = 2 * near / ( top - bottom );

		const a = ( right + left ) / ( right - left );
		const b = ( top + bottom ) / ( top - bottom );

		let c, d;

		if ( coordinateSystem === WebGLCoordinateSystem ) {

			c = - ( far + near ) / ( far - near );
			d = ( - 2 * far * near ) / ( far - near );

		} else if ( coordinateSystem === WebGPUCoordinateSystem ) {

			c = - far / ( far - near );
			d = ( - far * near ) / ( far - near );

		} else {

			throw new Error( 'THREE.Matrix4.makePerspective(): Invalid coordinate system: ' + coordinateSystem );

		}

		te[ 0 ] = x;	te[ 4 ] = 0;	te[ 8 ] = a; 	te[ 12 ] = 0;
		te[ 1 ] = 0;	te[ 5 ] = y;	te[ 9 ] = b; 	te[ 13 ] = 0;
		te[ 2 ] = 0;	te[ 6 ] = 0;	te[ 10 ] = c; 	te[ 14 ] = d;
		te[ 3 ] = 0;	te[ 7 ] = 0;	te[ 11 ] = - 1;	te[ 15 ] = 0;

		return this;

	}

	makeOrthographic( left, right, top, bottom, near, far, coordinateSystem = WebGLCoordinateSystem ) {

		const te = this.elements;
		const w = 1.0 / ( right - left );
		const h = 1.0 / ( top - bottom );
		const p = 1.0 / ( far - near );

		const x = ( right + left ) * w;
		const y = ( top + bottom ) * h;

		let z, zInv;

		if ( coordinateSystem === WebGLCoordinateSystem ) {

			z = ( far + near ) * p;
			zInv = - 2 * p;

		} else if ( coordinateSystem === WebGPUCoordinateSystem ) {

			z = near * p;
			zInv = - 1 * p;

		} else {

			throw new Error( 'THREE.Matrix4.makeOrthographic(): Invalid coordinate system: ' + coordinateSystem );

		}

		te[ 0 ] = 2 * w;	te[ 4 ] = 0;		te[ 8 ] = 0; 		te[ 12 ] = - x;
		te[ 1 ] = 0; 		te[ 5 ] = 2 * h;	te[ 9 ] = 0; 		te[ 13 ] = - y;
		te[ 2 ] = 0; 		te[ 6 ] = 0;		te[ 10 ] = zInv;	te[ 14 ] = - z;
		te[ 3 ] = 0; 		te[ 7 ] = 0;		te[ 11 ] = 0;		te[ 15 ] = 1;

		return this;

	}

	equals( matrix ) {

		const te = this.elements;
		const me = matrix.elements;

		for ( let i = 0; i < 16; i ++ ) {

			if ( te[ i ] !== me[ i ] ) return false;

		}

		return true;

	}

	fromArray( array, offset = 0 ) {

		for ( let i = 0; i < 16; i ++ ) {

			this.elements[ i ] = array[ i + offset ];

		}

		return this;

	}

	toArray( array = [], offset = 0 ) {

		const te = this.elements;

		array[ offset ] = te[ 0 ];
		array[ offset + 1 ] = te[ 1 ];
		array[ offset + 2 ] = te[ 2 ];
		array[ offset + 3 ] = te[ 3 ];

		array[ offset + 4 ] = te[ 4 ];
		array[ offset + 5 ] = te[ 5 ];
		array[ offset + 6 ] = te[ 6 ];
		array[ offset + 7 ] = te[ 7 ];

		array[ offset + 8 ] = te[ 8 ];
		array[ offset + 9 ] = te[ 9 ];
		array[ offset + 10 ] = te[ 10 ];
		array[ offset + 11 ] = te[ 11 ];

		array[ offset + 12 ] = te[ 12 ];
		array[ offset + 13 ] = te[ 13 ];
		array[ offset + 14 ] = te[ 14 ];
		array[ offset + 15 ] = te[ 15 ];

		return array;

	}

}

const _v1$5 = /*@__PURE__*/ new Vector3();
const _m1$2 = /*@__PURE__*/ new Matrix4();
const _zero = /*@__PURE__*/ new Vector3( 0, 0, 0 );
const _one = /*@__PURE__*/ new Vector3( 1, 1, 1 );
const _x = /*@__PURE__*/ new Vector3();
const _y = /*@__PURE__*/ new Vector3();
const _z = /*@__PURE__*/ new Vector3();

const _matrix$2 = /*@__PURE__*/ new Matrix4();
const _quaternion$3 = /*@__PURE__*/ new Quaternion();

class Euler {

	constructor( x = 0, y = 0, z = 0, order = Euler.DEFAULT_ORDER ) {

		this.isEuler = true;

		this._x = x;
		this._y = y;
		this._z = z;
		this._order = order;

	}

	get x() {

		return this._x;

	}

	set x( value ) {

		this._x = value;
		this._onChangeCallback();

	}

	get y() {

		return this._y;

	}

	set y( value ) {

		this._y = value;
		this._onChangeCallback();

	}

	get z() {

		return this._z;

	}

	set z( value ) {

		this._z = value;
		this._onChangeCallback();

	}

	get order() {

		return this._order;

	}

	set order( value ) {

		this._order = value;
		this._onChangeCallback();

	}

	set( x, y, z, order = this._order ) {

		this._x = x;
		this._y = y;
		this._z = z;
		this._order = order;

		this._onChangeCallback();

		return this;

	}

	clone() {

		return new this.constructor( this._x, this._y, this._z, this._order );

	}

	copy( euler ) {

		this._x = euler._x;
		this._y = euler._y;
		this._z = euler._z;
		this._order = euler._order;

		this._onChangeCallback();

		return this;

	}

	setFromRotationMatrix( m, order = this._order, update = true ) {

		// assumes the upper 3x3 of m is a pure rotation matrix (i.e, unscaled)

		const te = m.elements;
		const m11 = te[ 0 ], m12 = te[ 4 ], m13 = te[ 8 ];
		const m21 = te[ 1 ], m22 = te[ 5 ], m23 = te[ 9 ];
		const m31 = te[ 2 ], m32 = te[ 6 ], m33 = te[ 10 ];

		switch ( order ) {

			case 'XYZ':

				this._y = Math.asin( clamp$1( m13, - 1, 1 ) );

				if ( Math.abs( m13 ) < 0.9999999 ) {

					this._x = Math.atan2( - m23, m33 );
					this._z = Math.atan2( - m12, m11 );

				} else {

					this._x = Math.atan2( m32, m22 );
					this._z = 0;

				}

				break;

			case 'YXZ':

				this._x = Math.asin( - clamp$1( m23, - 1, 1 ) );

				if ( Math.abs( m23 ) < 0.9999999 ) {

					this._y = Math.atan2( m13, m33 );
					this._z = Math.atan2( m21, m22 );

				} else {

					this._y = Math.atan2( - m31, m11 );
					this._z = 0;

				}

				break;

			case 'ZXY':

				this._x = Math.asin( clamp$1( m32, - 1, 1 ) );

				if ( Math.abs( m32 ) < 0.9999999 ) {

					this._y = Math.atan2( - m31, m33 );
					this._z = Math.atan2( - m12, m22 );

				} else {

					this._y = 0;
					this._z = Math.atan2( m21, m11 );

				}

				break;

			case 'ZYX':

				this._y = Math.asin( - clamp$1( m31, - 1, 1 ) );

				if ( Math.abs( m31 ) < 0.9999999 ) {

					this._x = Math.atan2( m32, m33 );
					this._z = Math.atan2( m21, m11 );

				} else {

					this._x = 0;
					this._z = Math.atan2( - m12, m22 );

				}

				break;

			case 'YZX':

				this._z = Math.asin( clamp$1( m21, - 1, 1 ) );

				if ( Math.abs( m21 ) < 0.9999999 ) {

					this._x = Math.atan2( - m23, m22 );
					this._y = Math.atan2( - m31, m11 );

				} else {

					this._x = 0;
					this._y = Math.atan2( m13, m33 );

				}

				break;

			case 'XZY':

				this._z = Math.asin( - clamp$1( m12, - 1, 1 ) );

				if ( Math.abs( m12 ) < 0.9999999 ) {

					this._x = Math.atan2( m32, m22 );
					this._y = Math.atan2( m13, m11 );

				} else {

					this._x = Math.atan2( - m23, m33 );
					this._y = 0;

				}

				break;

			default:

				console.warn( 'THREE.Euler: .setFromRotationMatrix() encountered an unknown order: ' + order );

		}

		this._order = order;

		if ( update === true ) this._onChangeCallback();

		return this;

	}

	setFromQuaternion( q, order, update ) {

		_matrix$2.makeRotationFromQuaternion( q );

		return this.setFromRotationMatrix( _matrix$2, order, update );

	}

	setFromVector3( v, order = this._order ) {

		return this.set( v.x, v.y, v.z, order );

	}

	reorder( newOrder ) {

		// WARNING: this discards revolution information -bhouston

		_quaternion$3.setFromEuler( this );

		return this.setFromQuaternion( _quaternion$3, newOrder );

	}

	equals( euler ) {

		return ( euler._x === this._x ) && ( euler._y === this._y ) && ( euler._z === this._z ) && ( euler._order === this._order );

	}

	fromArray( array ) {

		this._x = array[ 0 ];
		this._y = array[ 1 ];
		this._z = array[ 2 ];
		if ( array[ 3 ] !== undefined ) this._order = array[ 3 ];

		this._onChangeCallback();

		return this;

	}

	toArray( array = [], offset = 0 ) {

		array[ offset ] = this._x;
		array[ offset + 1 ] = this._y;
		array[ offset + 2 ] = this._z;
		array[ offset + 3 ] = this._order;

		return array;

	}

	_onChange( callback ) {

		this._onChangeCallback = callback;

		return this;

	}

	_onChangeCallback() {}

	*[ Symbol.iterator ]() {

		yield this._x;
		yield this._y;
		yield this._z;
		yield this._order;

	}

}

Euler.DEFAULT_ORDER = 'XYZ';

class Layers {

	constructor() {

		this.mask = 1 | 0;

	}

	set( channel ) {

		this.mask = ( 1 << channel | 0 ) >>> 0;

	}

	enable( channel ) {

		this.mask |= 1 << channel | 0;

	}

	enableAll() {

		this.mask = 0xffffffff | 0;

	}

	toggle( channel ) {

		this.mask ^= 1 << channel | 0;

	}

	disable( channel ) {

		this.mask &= ~ ( 1 << channel | 0 );

	}

	disableAll() {

		this.mask = 0;

	}

	test( layers ) {

		return ( this.mask & layers.mask ) !== 0;

	}

	isEnabled( channel ) {

		return ( this.mask & ( 1 << channel | 0 ) ) !== 0;

	}

}

let _object3DId = 0;

const _v1$4 = /*@__PURE__*/ new Vector3();
const _q1 = /*@__PURE__*/ new Quaternion();
const _m1$1 = /*@__PURE__*/ new Matrix4();
const _target$1 = /*@__PURE__*/ new Vector3();

const _position$3 = /*@__PURE__*/ new Vector3();
const _scale$2 = /*@__PURE__*/ new Vector3();
const _quaternion$2 = /*@__PURE__*/ new Quaternion();

const _xAxis = /*@__PURE__*/ new Vector3( 1, 0, 0 );
const _yAxis = /*@__PURE__*/ new Vector3( 0, 1, 0 );
const _zAxis = /*@__PURE__*/ new Vector3( 0, 0, 1 );

const _addedEvent = { type: 'added' };
const _removedEvent = { type: 'removed' };

const _childaddedEvent = { type: 'childadded', child: null };
const _childremovedEvent = { type: 'childremoved', child: null };

class Object3D extends EventDispatcher {

	constructor() {

		super();

		this.isObject3D = true;

		Object.defineProperty( this, 'id', { value: _object3DId ++ } );

		this.uuid = generateUUID();

		this.name = '';
		this.type = 'Object3D';

		this.parent = null;
		this.children = [];

		this.up = Object3D.DEFAULT_UP.clone();

		const position = new Vector3();
		const rotation = new Euler();
		const quaternion = new Quaternion();
		const scale = new Vector3( 1, 1, 1 );

		function onRotationChange() {

			quaternion.setFromEuler( rotation, false );

		}

		function onQuaternionChange() {

			rotation.setFromQuaternion( quaternion, undefined, false );

		}

		rotation._onChange( onRotationChange );
		quaternion._onChange( onQuaternionChange );

		Object.defineProperties( this, {
			position: {
				configurable: true,
				enumerable: true,
				value: position
			},
			rotation: {
				configurable: true,
				enumerable: true,
				value: rotation
			},
			quaternion: {
				configurable: true,
				enumerable: true,
				value: quaternion
			},
			scale: {
				configurable: true,
				enumerable: true,
				value: scale
			},
			modelViewMatrix: {
				value: new Matrix4()
			},
			normalMatrix: {
				value: new Matrix3()
			}
		} );

		this.matrix = new Matrix4();
		this.matrixWorld = new Matrix4();

		this.matrixAutoUpdate = Object3D.DEFAULT_MATRIX_AUTO_UPDATE;

		this.matrixWorldAutoUpdate = Object3D.DEFAULT_MATRIX_WORLD_AUTO_UPDATE; // checked by the renderer
		this.matrixWorldNeedsUpdate = false;

		this.layers = new Layers();
		this.visible = true;

		this.castShadow = false;
		this.receiveShadow = false;

		this.frustumCulled = true;
		this.renderOrder = 0;

		this.animations = [];

		this.userData = {};

	}

	onBeforeShadow( /* renderer, object, camera, shadowCamera, geometry, depthMaterial, group */ ) {}

	onAfterShadow( /* renderer, object, camera, shadowCamera, geometry, depthMaterial, group */ ) {}

	onBeforeRender( /* renderer, scene, camera, geometry, material, group */ ) {}

	onAfterRender( /* renderer, scene, camera, geometry, material, group */ ) {}

	applyMatrix4( matrix ) {

		if ( this.matrixAutoUpdate ) this.updateMatrix();

		this.matrix.premultiply( matrix );

		this.matrix.decompose( this.position, this.quaternion, this.scale );

	}

	applyQuaternion( q ) {

		this.quaternion.premultiply( q );

		return this;

	}

	setRotationFromAxisAngle( axis, angle ) {

		// assumes axis is normalized

		this.quaternion.setFromAxisAngle( axis, angle );

	}

	setRotationFromEuler( euler ) {

		this.quaternion.setFromEuler( euler, true );

	}

	setRotationFromMatrix( m ) {

		// assumes the upper 3x3 of m is a pure rotation matrix (i.e, unscaled)

		this.quaternion.setFromRotationMatrix( m );

	}

	setRotationFromQuaternion( q ) {

		// assumes q is normalized

		this.quaternion.copy( q );

	}

	rotateOnAxis( axis, angle ) {

		// rotate object on axis in object space
		// axis is assumed to be normalized

		_q1.setFromAxisAngle( axis, angle );

		this.quaternion.multiply( _q1 );

		return this;

	}

	rotateOnWorldAxis( axis, angle ) {

		// rotate object on axis in world space
		// axis is assumed to be normalized
		// method assumes no rotated parent

		_q1.setFromAxisAngle( axis, angle );

		this.quaternion.premultiply( _q1 );

		return this;

	}

	rotateX( angle ) {

		return this.rotateOnAxis( _xAxis, angle );

	}

	rotateY( angle ) {

		return this.rotateOnAxis( _yAxis, angle );

	}

	rotateZ( angle ) {

		return this.rotateOnAxis( _zAxis, angle );

	}

	translateOnAxis( axis, distance ) {

		// translate object by distance along axis in object space
		// axis is assumed to be normalized

		_v1$4.copy( axis ).applyQuaternion( this.quaternion );

		this.position.add( _v1$4.multiplyScalar( distance ) );

		return this;

	}

	translateX( distance ) {

		return this.translateOnAxis( _xAxis, distance );

	}

	translateY( distance ) {

		return this.translateOnAxis( _yAxis, distance );

	}

	translateZ( distance ) {

		return this.translateOnAxis( _zAxis, distance );

	}

	localToWorld( vector ) {

		this.updateWorldMatrix( true, false );

		return vector.applyMatrix4( this.matrixWorld );

	}

	worldToLocal( vector ) {

		this.updateWorldMatrix( true, false );

		return vector.applyMatrix4( _m1$1.copy( this.matrixWorld ).invert() );

	}

	lookAt( x, y, z ) {

		// This method does not support objects having non-uniformly-scaled parent(s)

		if ( x.isVector3 ) {

			_target$1.copy( x );

		} else {

			_target$1.set( x, y, z );

		}

		const parent = this.parent;

		this.updateWorldMatrix( true, false );

		_position$3.setFromMatrixPosition( this.matrixWorld );

		if ( this.isCamera || this.isLight ) {

			_m1$1.lookAt( _position$3, _target$1, this.up );

		} else {

			_m1$1.lookAt( _target$1, _position$3, this.up );

		}

		this.quaternion.setFromRotationMatrix( _m1$1 );

		if ( parent ) {

			_m1$1.extractRotation( parent.matrixWorld );
			_q1.setFromRotationMatrix( _m1$1 );
			this.quaternion.premultiply( _q1.invert() );

		}

	}

	add( object ) {

		if ( arguments.length > 1 ) {

			for ( let i = 0; i < arguments.length; i ++ ) {

				this.add( arguments[ i ] );

			}

			return this;

		}

		if ( object === this ) {

			console.error( 'THREE.Object3D.add: object can\'t be added as a child of itself.', object );
			return this;

		}

		if ( object && object.isObject3D ) {

			object.removeFromParent();
			object.parent = this;
			this.children.push( object );

			object.dispatchEvent( _addedEvent );

			_childaddedEvent.child = object;
			this.dispatchEvent( _childaddedEvent );
			_childaddedEvent.child = null;

		} else {

			console.error( 'THREE.Object3D.add: object not an instance of THREE.Object3D.', object );

		}

		return this;

	}

	remove( object ) {

		if ( arguments.length > 1 ) {

			for ( let i = 0; i < arguments.length; i ++ ) {

				this.remove( arguments[ i ] );

			}

			return this;

		}

		const index = this.children.indexOf( object );

		if ( index !== - 1 ) {

			object.parent = null;
			this.children.splice( index, 1 );

			object.dispatchEvent( _removedEvent );

			_childremovedEvent.child = object;
			this.dispatchEvent( _childremovedEvent );
			_childremovedEvent.child = null;

		}

		return this;

	}

	removeFromParent() {

		const parent = this.parent;

		if ( parent !== null ) {

			parent.remove( this );

		}

		return this;

	}

	clear() {

		return this.remove( ... this.children );

	}

	attach( object ) {

		// adds object as a child of this, while maintaining the object's world transform

		// Note: This method does not support scene graphs having non-uniformly-scaled nodes(s)

		this.updateWorldMatrix( true, false );

		_m1$1.copy( this.matrixWorld ).invert();

		if ( object.parent !== null ) {

			object.parent.updateWorldMatrix( true, false );

			_m1$1.multiply( object.parent.matrixWorld );

		}

		object.applyMatrix4( _m1$1 );

		object.removeFromParent();
		object.parent = this;
		this.children.push( object );

		object.updateWorldMatrix( false, true );

		object.dispatchEvent( _addedEvent );

		_childaddedEvent.child = object;
		this.dispatchEvent( _childaddedEvent );
		_childaddedEvent.child = null;

		return this;

	}

	getObjectById( id ) {

		return this.getObjectByProperty( 'id', id );

	}

	getObjectByName( name ) {

		return this.getObjectByProperty( 'name', name );

	}

	getObjectByProperty( name, value ) {

		if ( this[ name ] === value ) return this;

		for ( let i = 0, l = this.children.length; i < l; i ++ ) {

			const child = this.children[ i ];
			const object = child.getObjectByProperty( name, value );

			if ( object !== undefined ) {

				return object;

			}

		}

		return undefined;

	}

	getObjectsByProperty( name, value, result = [] ) {

		if ( this[ name ] === value ) result.push( this );

		const children = this.children;

		for ( let i = 0, l = children.length; i < l; i ++ ) {

			children[ i ].getObjectsByProperty( name, value, result );

		}

		return result;

	}

	getWorldPosition( target ) {

		this.updateWorldMatrix( true, false );

		return target.setFromMatrixPosition( this.matrixWorld );

	}

	getWorldQuaternion( target ) {

		this.updateWorldMatrix( true, false );

		this.matrixWorld.decompose( _position$3, target, _scale$2 );

		return target;

	}

	getWorldScale( target ) {

		this.updateWorldMatrix( true, false );

		this.matrixWorld.decompose( _position$3, _quaternion$2, target );

		return target;

	}

	getWorldDirection( target ) {

		this.updateWorldMatrix( true, false );

		const e = this.matrixWorld.elements;

		return target.set( e[ 8 ], e[ 9 ], e[ 10 ] ).normalize();

	}

	raycast( /* raycaster, intersects */ ) {}

	traverse( callback ) {

		callback( this );

		const children = this.children;

		for ( let i = 0, l = children.length; i < l; i ++ ) {

			children[ i ].traverse( callback );

		}

	}

	traverseVisible( callback ) {

		if ( this.visible === false ) return;

		callback( this );

		const children = this.children;

		for ( let i = 0, l = children.length; i < l; i ++ ) {

			children[ i ].traverseVisible( callback );

		}

	}

	traverseAncestors( callback ) {

		const parent = this.parent;

		if ( parent !== null ) {

			callback( parent );

			parent.traverseAncestors( callback );

		}

	}

	updateMatrix() {

		this.matrix.compose( this.position, this.quaternion, this.scale );

		this.matrixWorldNeedsUpdate = true;

	}

	updateMatrixWorld( force ) {

		if ( this.matrixAutoUpdate ) this.updateMatrix();

		if ( this.matrixWorldNeedsUpdate || force ) {

			if ( this.matrixWorldAutoUpdate === true ) {

				if ( this.parent === null ) {

					this.matrixWorld.copy( this.matrix );

				} else {

					this.matrixWorld.multiplyMatrices( this.parent.matrixWorld, this.matrix );

				}

			}

			this.matrixWorldNeedsUpdate = false;

			force = true;

		}

		// make sure descendants are updated if required

		const children = this.children;

		for ( let i = 0, l = children.length; i < l; i ++ ) {

			const child = children[ i ];

			child.updateMatrixWorld( force );

		}

	}

	updateWorldMatrix( updateParents, updateChildren ) {

		const parent = this.parent;

		if ( updateParents === true && parent !== null ) {

			parent.updateWorldMatrix( true, false );

		}

		if ( this.matrixAutoUpdate ) this.updateMatrix();

		if ( this.matrixWorldAutoUpdate === true ) {

			if ( this.parent === null ) {

				this.matrixWorld.copy( this.matrix );

			} else {

				this.matrixWorld.multiplyMatrices( this.parent.matrixWorld, this.matrix );

			}

		}

		// make sure descendants are updated

		if ( updateChildren === true ) {

			const children = this.children;

			for ( let i = 0, l = children.length; i < l; i ++ ) {

				const child = children[ i ];

				child.updateWorldMatrix( false, true );

			}

		}

	}

	toJSON( meta ) {

		// meta is a string when called from JSON.stringify
		const isRootObject = ( meta === undefined || typeof meta === 'string' );

		const output = {};

		// meta is a hash used to collect geometries, materials.
		// not providing it implies that this is the root object
		// being serialized.
		if ( isRootObject ) {

			// initialize meta obj
			meta = {
				geometries: {},
				materials: {},
				textures: {},
				images: {},
				shapes: {},
				skeletons: {},
				animations: {},
				nodes: {}
			};

			output.metadata = {
				version: 4.6,
				type: 'Object',
				generator: 'Object3D.toJSON'
			};

		}

		// standard Object3D serialization

		const object = {};

		object.uuid = this.uuid;
		object.type = this.type;

		if ( this.name !== '' ) object.name = this.name;
		if ( this.castShadow === true ) object.castShadow = true;
		if ( this.receiveShadow === true ) object.receiveShadow = true;
		if ( this.visible === false ) object.visible = false;
		if ( this.frustumCulled === false ) object.frustumCulled = false;
		if ( this.renderOrder !== 0 ) object.renderOrder = this.renderOrder;
		if ( Object.keys( this.userData ).length > 0 ) object.userData = this.userData;

		object.layers = this.layers.mask;
		object.matrix = this.matrix.toArray();
		object.up = this.up.toArray();

		if ( this.matrixAutoUpdate === false ) object.matrixAutoUpdate = false;

		// object specific properties

		if ( this.isInstancedMesh ) {

			object.type = 'InstancedMesh';
			object.count = this.count;
			object.instanceMatrix = this.instanceMatrix.toJSON();
			if ( this.instanceColor !== null ) object.instanceColor = this.instanceColor.toJSON();

		}

		if ( this.isBatchedMesh ) {

			object.type = 'BatchedMesh';
			object.perObjectFrustumCulled = this.perObjectFrustumCulled;
			object.sortObjects = this.sortObjects;

			object.drawRanges = this._drawRanges;
			object.reservedRanges = this._reservedRanges;

			object.visibility = this._visibility;
			object.active = this._active;
			object.bounds = this._bounds.map( bound => ( {
				boxInitialized: bound.boxInitialized,
				boxMin: bound.box.min.toArray(),
				boxMax: bound.box.max.toArray(),

				sphereInitialized: bound.sphereInitialized,
				sphereRadius: bound.sphere.radius,
				sphereCenter: bound.sphere.center.toArray()
			} ) );

			object.maxInstanceCount = this._maxInstanceCount;
			object.maxVertexCount = this._maxVertexCount;
			object.maxIndexCount = this._maxIndexCount;

			object.geometryInitialized = this._geometryInitialized;
			object.geometryCount = this._geometryCount;

			object.matricesTexture = this._matricesTexture.toJSON( meta );

			if ( this._colorsTexture !== null ) object.colorsTexture = this._colorsTexture.toJSON( meta );

			if ( this.boundingSphere !== null ) {

				object.boundingSphere = {
					center: object.boundingSphere.center.toArray(),
					radius: object.boundingSphere.radius
				};

			}

			if ( this.boundingBox !== null ) {

				object.boundingBox = {
					min: object.boundingBox.min.toArray(),
					max: object.boundingBox.max.toArray()
				};

			}

		}

		//

		function serialize( library, element ) {

			if ( library[ element.uuid ] === undefined ) {

				library[ element.uuid ] = element.toJSON( meta );

			}

			return element.uuid;

		}

		if ( this.isScene ) {

			if ( this.background ) {

				if ( this.background.isColor ) {

					object.background = this.background.toJSON();

				} else if ( this.background.isTexture ) {

					object.background = this.background.toJSON( meta ).uuid;

				}

			}

			if ( this.environment && this.environment.isTexture && this.environment.isRenderTargetTexture !== true ) {

				object.environment = this.environment.toJSON( meta ).uuid;

			}

		} else if ( this.isMesh || this.isLine || this.isPoints ) {

			object.geometry = serialize( meta.geometries, this.geometry );

			const parameters = this.geometry.parameters;

			if ( parameters !== undefined && parameters.shapes !== undefined ) {

				const shapes = parameters.shapes;

				if ( Array.isArray( shapes ) ) {

					for ( let i = 0, l = shapes.length; i < l; i ++ ) {

						const shape = shapes[ i ];

						serialize( meta.shapes, shape );

					}

				} else {

					serialize( meta.shapes, shapes );

				}

			}

		}

		if ( this.isSkinnedMesh ) {

			object.bindMode = this.bindMode;
			object.bindMatrix = this.bindMatrix.toArray();

			if ( this.skeleton !== undefined ) {

				serialize( meta.skeletons, this.skeleton );

				object.skeleton = this.skeleton.uuid;

			}

		}

		if ( this.material !== undefined ) {

			if ( Array.isArray( this.material ) ) {

				const uuids = [];

				for ( let i = 0, l = this.material.length; i < l; i ++ ) {

					uuids.push( serialize( meta.materials, this.material[ i ] ) );

				}

				object.material = uuids;

			} else {

				object.material = serialize( meta.materials, this.material );

			}

		}

		//

		if ( this.children.length > 0 ) {

			object.children = [];

			for ( let i = 0; i < this.children.length; i ++ ) {

				object.children.push( this.children[ i ].toJSON( meta ).object );

			}

		}

		//

		if ( this.animations.length > 0 ) {

			object.animations = [];

			for ( let i = 0; i < this.animations.length; i ++ ) {

				const animation = this.animations[ i ];

				object.animations.push( serialize( meta.animations, animation ) );

			}

		}

		if ( isRootObject ) {

			const geometries = extractFromCache( meta.geometries );
			const materials = extractFromCache( meta.materials );
			const textures = extractFromCache( meta.textures );
			const images = extractFromCache( meta.images );
			const shapes = extractFromCache( meta.shapes );
			const skeletons = extractFromCache( meta.skeletons );
			const animations = extractFromCache( meta.animations );
			const nodes = extractFromCache( meta.nodes );

			if ( geometries.length > 0 ) output.geometries = geometries;
			if ( materials.length > 0 ) output.materials = materials;
			if ( textures.length > 0 ) output.textures = textures;
			if ( images.length > 0 ) output.images = images;
			if ( shapes.length > 0 ) output.shapes = shapes;
			if ( skeletons.length > 0 ) output.skeletons = skeletons;
			if ( animations.length > 0 ) output.animations = animations;
			if ( nodes.length > 0 ) output.nodes = nodes;

		}

		output.object = object;

		return output;

		// extract data from the cache hash
		// remove metadata on each item
		// and return as array
		function extractFromCache( cache ) {

			const values = [];
			for ( const key in cache ) {

				const data = cache[ key ];
				delete data.metadata;
				values.push( data );

			}

			return values;

		}

	}

	clone( recursive ) {

		return new this.constructor().copy( this, recursive );

	}

	copy( source, recursive = true ) {

		this.name = source.name;

		this.up.copy( source.up );

		this.position.copy( source.position );
		this.rotation.order = source.rotation.order;
		this.quaternion.copy( source.quaternion );
		this.scale.copy( source.scale );

		this.matrix.copy( source.matrix );
		this.matrixWorld.copy( source.matrixWorld );

		this.matrixAutoUpdate = source.matrixAutoUpdate;

		this.matrixWorldAutoUpdate = source.matrixWorldAutoUpdate;
		this.matrixWorldNeedsUpdate = source.matrixWorldNeedsUpdate;

		this.layers.mask = source.layers.mask;
		this.visible = source.visible;

		this.castShadow = source.castShadow;
		this.receiveShadow = source.receiveShadow;

		this.frustumCulled = source.frustumCulled;
		this.renderOrder = source.renderOrder;

		this.animations = source.animations.slice();

		this.userData = JSON.parse( JSON.stringify( source.userData ) );

		if ( recursive === true ) {

			for ( let i = 0; i < source.children.length; i ++ ) {

				const child = source.children[ i ];
				this.add( child.clone() );

			}

		}

		return this;

	}

}

Object3D.DEFAULT_UP = /*@__PURE__*/ new Vector3( 0, 1, 0 );
Object3D.DEFAULT_MATRIX_AUTO_UPDATE = true;
Object3D.DEFAULT_MATRIX_WORLD_AUTO_UPDATE = true;

const _v0$1 = /*@__PURE__*/ new Vector3();
const _v1$3 = /*@__PURE__*/ new Vector3();
const _v2$2 = /*@__PURE__*/ new Vector3();
const _v3$2 = /*@__PURE__*/ new Vector3();

const _vab = /*@__PURE__*/ new Vector3();
const _vac = /*@__PURE__*/ new Vector3();
const _vbc = /*@__PURE__*/ new Vector3();
const _vap = /*@__PURE__*/ new Vector3();
const _vbp = /*@__PURE__*/ new Vector3();
const _vcp = /*@__PURE__*/ new Vector3();

class Triangle {

	constructor( a = new Vector3(), b = new Vector3(), c = new Vector3() ) {

		this.a = a;
		this.b = b;
		this.c = c;

	}

	static getNormal( a, b, c, target ) {

		target.subVectors( c, b );
		_v0$1.subVectors( a, b );
		target.cross( _v0$1 );

		const targetLengthSq = target.lengthSq();
		if ( targetLengthSq > 0 ) {

			return target.multiplyScalar( 1 / Math.sqrt( targetLengthSq ) );

		}

		return target.set( 0, 0, 0 );

	}

	// static/instance method to calculate barycentric coordinates
	// based on: http://www.blackpawn.com/texts/pointinpoly/default.html
	static getBarycoord( point, a, b, c, target ) {

		_v0$1.subVectors( c, a );
		_v1$3.subVectors( b, a );
		_v2$2.subVectors( point, a );

		const dot00 = _v0$1.dot( _v0$1 );
		const dot01 = _v0$1.dot( _v1$3 );
		const dot02 = _v0$1.dot( _v2$2 );
		const dot11 = _v1$3.dot( _v1$3 );
		const dot12 = _v1$3.dot( _v2$2 );

		const denom = ( dot00 * dot11 - dot01 * dot01 );

		// collinear or singular triangle
		if ( denom === 0 ) {

			target.set( 0, 0, 0 );
			return null;

		}

		const invDenom = 1 / denom;
		const u = ( dot11 * dot02 - dot01 * dot12 ) * invDenom;
		const v = ( dot00 * dot12 - dot01 * dot02 ) * invDenom;

		// barycentric coordinates must always sum to 1
		return target.set( 1 - u - v, v, u );

	}

	static containsPoint( point, a, b, c ) {

		// if the triangle is degenerate then we can't contain a point
		if ( this.getBarycoord( point, a, b, c, _v3$2 ) === null ) {

			return false;

		}

		return ( _v3$2.x >= 0 ) && ( _v3$2.y >= 0 ) && ( ( _v3$2.x + _v3$2.y ) <= 1 );

	}

	static getInterpolation( point, p1, p2, p3, v1, v2, v3, target ) {

		if ( this.getBarycoord( point, p1, p2, p3, _v3$2 ) === null ) {

			target.x = 0;
			target.y = 0;
			if ( 'z' in target ) target.z = 0;
			if ( 'w' in target ) target.w = 0;
			return null;

		}

		target.setScalar( 0 );
		target.addScaledVector( v1, _v3$2.x );
		target.addScaledVector( v2, _v3$2.y );
		target.addScaledVector( v3, _v3$2.z );

		return target;

	}

	static isFrontFacing( a, b, c, direction ) {

		_v0$1.subVectors( c, b );
		_v1$3.subVectors( a, b );

		// strictly front facing
		return ( _v0$1.cross( _v1$3 ).dot( direction ) < 0 ) ? true : false;

	}

	set( a, b, c ) {

		this.a.copy( a );
		this.b.copy( b );
		this.c.copy( c );

		return this;

	}

	setFromPointsAndIndices( points, i0, i1, i2 ) {

		this.a.copy( points[ i0 ] );
		this.b.copy( points[ i1 ] );
		this.c.copy( points[ i2 ] );

		return this;

	}

	setFromAttributeAndIndices( attribute, i0, i1, i2 ) {

		this.a.fromBufferAttribute( attribute, i0 );
		this.b.fromBufferAttribute( attribute, i1 );
		this.c.fromBufferAttribute( attribute, i2 );

		return this;

	}

	clone() {

		return new this.constructor().copy( this );

	}

	copy( triangle ) {

		this.a.copy( triangle.a );
		this.b.copy( triangle.b );
		this.c.copy( triangle.c );

		return this;

	}

	getArea() {

		_v0$1.subVectors( this.c, this.b );
		_v1$3.subVectors( this.a, this.b );

		return _v0$1.cross( _v1$3 ).length() * 0.5;

	}

	getMidpoint( target ) {

		return target.addVectors( this.a, this.b ).add( this.c ).multiplyScalar( 1 / 3 );

	}

	getNormal( target ) {

		return Triangle.getNormal( this.a, this.b, this.c, target );

	}

	getPlane( target ) {

		return target.setFromCoplanarPoints( this.a, this.b, this.c );

	}

	getBarycoord( point, target ) {

		return Triangle.getBarycoord( point, this.a, this.b, this.c, target );

	}

	getInterpolation( point, v1, v2, v3, target ) {

		return Triangle.getInterpolation( point, this.a, this.b, this.c, v1, v2, v3, target );

	}

	containsPoint( point ) {

		return Triangle.containsPoint( point, this.a, this.b, this.c );

	}

	isFrontFacing( direction ) {

		return Triangle.isFrontFacing( this.a, this.b, this.c, direction );

	}

	intersectsBox( box ) {

		return box.intersectsTriangle( this );

	}

	closestPointToPoint( p, target ) {

		const a = this.a, b = this.b, c = this.c;
		let v, w;

		// algorithm thanks to Real-Time Collision Detection by Christer Ericson,
		// published by Morgan Kaufmann Publishers, (c) 2005 Elsevier Inc.,
		// under the accompanying license; see chapter 5.1.5 for detailed explanation.
		// basically, we're distinguishing which of the voronoi regions of the triangle
		// the point lies in with the minimum amount of redundant computation.

		_vab.subVectors( b, a );
		_vac.subVectors( c, a );
		_vap.subVectors( p, a );
		const d1 = _vab.dot( _vap );
		const d2 = _vac.dot( _vap );
		if ( d1 <= 0 && d2 <= 0 ) {

			// vertex region of A; barycentric coords (1, 0, 0)
			return target.copy( a );

		}

		_vbp.subVectors( p, b );
		const d3 = _vab.dot( _vbp );
		const d4 = _vac.dot( _vbp );
		if ( d3 >= 0 && d4 <= d3 ) {

			// vertex region of B; barycentric coords (0, 1, 0)
			return target.copy( b );

		}

		const vc = d1 * d4 - d3 * d2;
		if ( vc <= 0 && d1 >= 0 && d3 <= 0 ) {

			v = d1 / ( d1 - d3 );
			// edge region of AB; barycentric coords (1-v, v, 0)
			return target.copy( a ).addScaledVector( _vab, v );

		}

		_vcp.subVectors( p, c );
		const d5 = _vab.dot( _vcp );
		const d6 = _vac.dot( _vcp );
		if ( d6 >= 0 && d5 <= d6 ) {

			// vertex region of C; barycentric coords (0, 0, 1)
			return target.copy( c );

		}

		const vb = d5 * d2 - d1 * d6;
		if ( vb <= 0 && d2 >= 0 && d6 <= 0 ) {

			w = d2 / ( d2 - d6 );
			// edge region of AC; barycentric coords (1-w, 0, w)
			return target.copy( a ).addScaledVector( _vac, w );

		}

		const va = d3 * d6 - d5 * d4;
		if ( va <= 0 && ( d4 - d3 ) >= 0 && ( d5 - d6 ) >= 0 ) {

			_vbc.subVectors( c, b );
			w = ( d4 - d3 ) / ( ( d4 - d3 ) + ( d5 - d6 ) );
			// edge region of BC; barycentric coords (0, 1-w, w)
			return target.copy( b ).addScaledVector( _vbc, w ); // edge region of BC

		}

		// face region
		const denom = 1 / ( va + vb + vc );
		// u = va * denom
		v = vb * denom;
		w = vc * denom;

		return target.copy( a ).addScaledVector( _vab, v ).addScaledVector( _vac, w );

	}

	equals( triangle ) {

		return triangle.a.equals( this.a ) && triangle.b.equals( this.b ) && triangle.c.equals( this.c );

	}

}

const _colorKeywords = { 'aliceblue': 0xF0F8FF, 'antiquewhite': 0xFAEBD7, 'aqua': 0x00FFFF, 'aquamarine': 0x7FFFD4, 'azure': 0xF0FFFF,
	'beige': 0xF5F5DC, 'bisque': 0xFFE4C4, 'black': 0x000000, 'blanchedalmond': 0xFFEBCD, 'blue': 0x0000FF, 'blueviolet': 0x8A2BE2,
	'brown': 0xA52A2A, 'burlywood': 0xDEB887, 'cadetblue': 0x5F9EA0, 'chartreuse': 0x7FFF00, 'chocolate': 0xD2691E, 'coral': 0xFF7F50,
	'cornflowerblue': 0x6495ED, 'cornsilk': 0xFFF8DC, 'crimson': 0xDC143C, 'cyan': 0x00FFFF, 'darkblue': 0x00008B, 'darkcyan': 0x008B8B,
	'darkgoldenrod': 0xB8860B, 'darkgray': 0xA9A9A9, 'darkgreen': 0x006400, 'darkgrey': 0xA9A9A9, 'darkkhaki': 0xBDB76B, 'darkmagenta': 0x8B008B,
	'darkolivegreen': 0x556B2F, 'darkorange': 0xFF8C00, 'darkorchid': 0x9932CC, 'darkred': 0x8B0000, 'darksalmon': 0xE9967A, 'darkseagreen': 0x8FBC8F,
	'darkslateblue': 0x483D8B, 'darkslategray': 0x2F4F4F, 'darkslategrey': 0x2F4F4F, 'darkturquoise': 0x00CED1, 'darkviolet': 0x9400D3,
	'deeppink': 0xFF1493, 'deepskyblue': 0x00BFFF, 'dimgray': 0x696969, 'dimgrey': 0x696969, 'dodgerblue': 0x1E90FF, 'firebrick': 0xB22222,
	'floralwhite': 0xFFFAF0, 'forestgreen': 0x228B22, 'fuchsia': 0xFF00FF, 'gainsboro': 0xDCDCDC, 'ghostwhite': 0xF8F8FF, 'gold': 0xFFD700,
	'goldenrod': 0xDAA520, 'gray': 0x808080, 'green': 0x008000, 'greenyellow': 0xADFF2F, 'grey': 0x808080, 'honeydew': 0xF0FFF0, 'hotpink': 0xFF69B4,
	'indianred': 0xCD5C5C, 'indigo': 0x4B0082, 'ivory': 0xFFFFF0, 'khaki': 0xF0E68C, 'lavender': 0xE6E6FA, 'lavenderblush': 0xFFF0F5, 'lawngreen': 0x7CFC00,
	'lemonchiffon': 0xFFFACD, 'lightblue': 0xADD8E6, 'lightcoral': 0xF08080, 'lightcyan': 0xE0FFFF, 'lightgoldenrodyellow': 0xFAFAD2, 'lightgray': 0xD3D3D3,
	'lightgreen': 0x90EE90, 'lightgrey': 0xD3D3D3, 'lightpink': 0xFFB6C1, 'lightsalmon': 0xFFA07A, 'lightseagreen': 0x20B2AA, 'lightskyblue': 0x87CEFA,
	'lightslategray': 0x778899, 'lightslategrey': 0x778899, 'lightsteelblue': 0xB0C4DE, 'lightyellow': 0xFFFFE0, 'lime': 0x00FF00, 'limegreen': 0x32CD32,
	'linen': 0xFAF0E6, 'magenta': 0xFF00FF, 'maroon': 0x800000, 'mediumaquamarine': 0x66CDAA, 'mediumblue': 0x0000CD, 'mediumorchid': 0xBA55D3,
	'mediumpurple': 0x9370DB, 'mediumseagreen': 0x3CB371, 'mediumslateblue': 0x7B68EE, 'mediumspringgreen': 0x00FA9A, 'mediumturquoise': 0x48D1CC,
	'mediumvioletred': 0xC71585, 'midnightblue': 0x191970, 'mintcream': 0xF5FFFA, 'mistyrose': 0xFFE4E1, 'moccasin': 0xFFE4B5, 'navajowhite': 0xFFDEAD,
	'navy': 0x000080, 'oldlace': 0xFDF5E6, 'olive': 0x808000, 'olivedrab': 0x6B8E23, 'orange': 0xFFA500, 'orangered': 0xFF4500, 'orchid': 0xDA70D6,
	'palegoldenrod': 0xEEE8AA, 'palegreen': 0x98FB98, 'paleturquoise': 0xAFEEEE, 'palevioletred': 0xDB7093, 'papayawhip': 0xFFEFD5, 'peachpuff': 0xFFDAB9,
	'peru': 0xCD853F, 'pink': 0xFFC0CB, 'plum': 0xDDA0DD, 'powderblue': 0xB0E0E6, 'purple': 0x800080, 'rebeccapurple': 0x663399, 'red': 0xFF0000, 'rosybrown': 0xBC8F8F,
	'royalblue': 0x4169E1, 'saddlebrown': 0x8B4513, 'salmon': 0xFA8072, 'sandybrown': 0xF4A460, 'seagreen': 0x2E8B57, 'seashell': 0xFFF5EE,
	'sienna': 0xA0522D, 'silver': 0xC0C0C0, 'skyblue': 0x87CEEB, 'slateblue': 0x6A5ACD, 'slategray': 0x708090, 'slategrey': 0x708090, 'snow': 0xFFFAFA,
	'springgreen': 0x00FF7F, 'steelblue': 0x4682B4, 'tan': 0xD2B48C, 'teal': 0x008080, 'thistle': 0xD8BFD8, 'tomato': 0xFF6347, 'turquoise': 0x40E0D0,
	'violet': 0xEE82EE, 'wheat': 0xF5DEB3, 'white': 0xFFFFFF, 'whitesmoke': 0xF5F5F5, 'yellow': 0xFFFF00, 'yellowgreen': 0x9ACD32 };

const _hslA = { h: 0, s: 0, l: 0 };
const _hslB = { h: 0, s: 0, l: 0 };

function hue2rgb( p, q, t ) {

	if ( t < 0 ) t += 1;
	if ( t > 1 ) t -= 1;
	if ( t < 1 / 6 ) return p + ( q - p ) * 6 * t;
	if ( t < 1 / 2 ) return q;
	if ( t < 2 / 3 ) return p + ( q - p ) * 6 * ( 2 / 3 - t );
	return p;

}

class Color {

	constructor( r, g, b ) {

		this.isColor = true;

		this.r = 1;
		this.g = 1;
		this.b = 1;

		return this.set( r, g, b );

	}

	set( r, g, b ) {

		if ( g === undefined && b === undefined ) {

			// r is THREE.Color, hex or string

			const value = r;

			if ( value && value.isColor ) {

				this.copy( value );

			} else if ( typeof value === 'number' ) {

				this.setHex( value );

			} else if ( typeof value === 'string' ) {

				this.setStyle( value );

			}

		} else {

			this.setRGB( r, g, b );

		}

		return this;

	}

	setScalar( scalar ) {

		this.r = scalar;
		this.g = scalar;
		this.b = scalar;

		return this;

	}

	setHex( hex, colorSpace = SRGBColorSpace ) {

		hex = Math.floor( hex );

		this.r = ( hex >> 16 & 255 ) / 255;
		this.g = ( hex >> 8 & 255 ) / 255;
		this.b = ( hex & 255 ) / 255;

		ColorManagement.toWorkingColorSpace( this, colorSpace );

		return this;

	}

	setRGB( r, g, b, colorSpace = ColorManagement.workingColorSpace ) {

		this.r = r;
		this.g = g;
		this.b = b;

		ColorManagement.toWorkingColorSpace( this, colorSpace );

		return this;

	}

	setHSL( h, s, l, colorSpace = ColorManagement.workingColorSpace ) {

		// h,s,l ranges are in 0.0 - 1.0
		h = euclideanModulo( h, 1 );
		s = clamp$1( s, 0, 1 );
		l = clamp$1( l, 0, 1 );

		if ( s === 0 ) {

			this.r = this.g = this.b = l;

		} else {

			const p = l <= 0.5 ? l * ( 1 + s ) : l + s - ( l * s );
			const q = ( 2 * l ) - p;

			this.r = hue2rgb( q, p, h + 1 / 3 );
			this.g = hue2rgb( q, p, h );
			this.b = hue2rgb( q, p, h - 1 / 3 );

		}

		ColorManagement.toWorkingColorSpace( this, colorSpace );

		return this;

	}

	setStyle( style, colorSpace = SRGBColorSpace ) {

		function handleAlpha( string ) {

			if ( string === undefined ) return;

			if ( parseFloat( string ) < 1 ) {

				console.warn( 'THREE.Color: Alpha component of ' + style + ' will be ignored.' );

			}

		}


		let m;

		if ( m = /^(\w+)\(([^\)]*)\)/.exec( style ) ) {

			// rgb / hsl

			let color;
			const name = m[ 1 ];
			const components = m[ 2 ];

			switch ( name ) {

				case 'rgb':
				case 'rgba':

					if ( color = /^\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*(?:,\s*(\d*\.?\d+)\s*)?$/.exec( components ) ) {

						// rgb(255,0,0) rgba(255,0,0,0.5)

						handleAlpha( color[ 4 ] );

						return this.setRGB(
							Math.min( 255, parseInt( color[ 1 ], 10 ) ) / 255,
							Math.min( 255, parseInt( color[ 2 ], 10 ) ) / 255,
							Math.min( 255, parseInt( color[ 3 ], 10 ) ) / 255,
							colorSpace
						);

					}

					if ( color = /^\s*(\d+)\%\s*,\s*(\d+)\%\s*,\s*(\d+)\%\s*(?:,\s*(\d*\.?\d+)\s*)?$/.exec( components ) ) {

						// rgb(100%,0%,0%) rgba(100%,0%,0%,0.5)

						handleAlpha( color[ 4 ] );

						return this.setRGB(
							Math.min( 100, parseInt( color[ 1 ], 10 ) ) / 100,
							Math.min( 100, parseInt( color[ 2 ], 10 ) ) / 100,
							Math.min( 100, parseInt( color[ 3 ], 10 ) ) / 100,
							colorSpace
						);

					}

					break;

				case 'hsl':
				case 'hsla':

					if ( color = /^\s*(\d*\.?\d+)\s*,\s*(\d*\.?\d+)\%\s*,\s*(\d*\.?\d+)\%\s*(?:,\s*(\d*\.?\d+)\s*)?$/.exec( components ) ) {

						// hsl(120,50%,50%) hsla(120,50%,50%,0.5)

						handleAlpha( color[ 4 ] );

						return this.setHSL(
							parseFloat( color[ 1 ] ) / 360,
							parseFloat( color[ 2 ] ) / 100,
							parseFloat( color[ 3 ] ) / 100,
							colorSpace
						);

					}

					break;

				default:

					console.warn( 'THREE.Color: Unknown color model ' + style );

			}

		} else if ( m = /^\#([A-Fa-f\d]+)$/.exec( style ) ) {

			// hex color

			const hex = m[ 1 ];
			const size = hex.length;

			if ( size === 3 ) {

				// #ff0
				return this.setRGB(
					parseInt( hex.charAt( 0 ), 16 ) / 15,
					parseInt( hex.charAt( 1 ), 16 ) / 15,
					parseInt( hex.charAt( 2 ), 16 ) / 15,
					colorSpace
				);

			} else if ( size === 6 ) {

				// #ff0000
				return this.setHex( parseInt( hex, 16 ), colorSpace );

			} else {

				console.warn( 'THREE.Color: Invalid hex color ' + style );

			}

		} else if ( style && style.length > 0 ) {

			return this.setColorName( style, colorSpace );

		}

		return this;

	}

	setColorName( style, colorSpace = SRGBColorSpace ) {

		// color keywords
		const hex = _colorKeywords[ style.toLowerCase() ];

		if ( hex !== undefined ) {

			// red
			this.setHex( hex, colorSpace );

		} else {

			// unknown color
			console.warn( 'THREE.Color: Unknown color ' + style );

		}

		return this;

	}

	clone() {

		return new this.constructor( this.r, this.g, this.b );

	}

	copy( color ) {

		this.r = color.r;
		this.g = color.g;
		this.b = color.b;

		return this;

	}

	copySRGBToLinear( color ) {

		this.r = SRGBToLinear( color.r );
		this.g = SRGBToLinear( color.g );
		this.b = SRGBToLinear( color.b );

		return this;

	}

	copyLinearToSRGB( color ) {

		this.r = LinearToSRGB( color.r );
		this.g = LinearToSRGB( color.g );
		this.b = LinearToSRGB( color.b );

		return this;

	}

	convertSRGBToLinear() {

		this.copySRGBToLinear( this );

		return this;

	}

	convertLinearToSRGB() {

		this.copyLinearToSRGB( this );

		return this;

	}

	getHex( colorSpace = SRGBColorSpace ) {

		ColorManagement.fromWorkingColorSpace( _color.copy( this ), colorSpace );

		return Math.round( clamp$1( _color.r * 255, 0, 255 ) ) * 65536 + Math.round( clamp$1( _color.g * 255, 0, 255 ) ) * 256 + Math.round( clamp$1( _color.b * 255, 0, 255 ) );

	}

	getHexString( colorSpace = SRGBColorSpace ) {

		return ( '000000' + this.getHex( colorSpace ).toString( 16 ) ).slice( - 6 );

	}

	getHSL( target, colorSpace = ColorManagement.workingColorSpace ) {

		// h,s,l ranges are in 0.0 - 1.0

		ColorManagement.fromWorkingColorSpace( _color.copy( this ), colorSpace );

		const r = _color.r, g = _color.g, b = _color.b;

		const max = Math.max( r, g, b );
		const min = Math.min( r, g, b );

		let hue, saturation;
		const lightness = ( min + max ) / 2.0;

		if ( min === max ) {

			hue = 0;
			saturation = 0;

		} else {

			const delta = max - min;

			saturation = lightness <= 0.5 ? delta / ( max + min ) : delta / ( 2 - max - min );

			switch ( max ) {

				case r: hue = ( g - b ) / delta + ( g < b ? 6 : 0 ); break;
				case g: hue = ( b - r ) / delta + 2; break;
				case b: hue = ( r - g ) / delta + 4; break;

			}

			hue /= 6;

		}

		target.h = hue;
		target.s = saturation;
		target.l = lightness;

		return target;

	}

	getRGB( target, colorSpace = ColorManagement.workingColorSpace ) {

		ColorManagement.fromWorkingColorSpace( _color.copy( this ), colorSpace );

		target.r = _color.r;
		target.g = _color.g;
		target.b = _color.b;

		return target;

	}

	getStyle( colorSpace = SRGBColorSpace ) {

		ColorManagement.fromWorkingColorSpace( _color.copy( this ), colorSpace );

		const r = _color.r, g = _color.g, b = _color.b;

		if ( colorSpace !== SRGBColorSpace ) {

			// Requires CSS Color Module Level 4 (https://www.w3.org/TR/css-color-4/).
			return `color(${ colorSpace } ${ r.toFixed( 3 ) } ${ g.toFixed( 3 ) } ${ b.toFixed( 3 ) })`;

		}

		return `rgb(${ Math.round( r * 255 ) },${ Math.round( g * 255 ) },${ Math.round( b * 255 ) })`;

	}

	offsetHSL( h, s, l ) {

		this.getHSL( _hslA );

		return this.setHSL( _hslA.h + h, _hslA.s + s, _hslA.l + l );

	}

	add( color ) {

		this.r += color.r;
		this.g += color.g;
		this.b += color.b;

		return this;

	}

	addColors( color1, color2 ) {

		this.r = color1.r + color2.r;
		this.g = color1.g + color2.g;
		this.b = color1.b + color2.b;

		return this;

	}

	addScalar( s ) {

		this.r += s;
		this.g += s;
		this.b += s;

		return this;

	}

	sub( color ) {

		this.r = Math.max( 0, this.r - color.r );
		this.g = Math.max( 0, this.g - color.g );
		this.b = Math.max( 0, this.b - color.b );

		return this;

	}

	multiply( color ) {

		this.r *= color.r;
		this.g *= color.g;
		this.b *= color.b;

		return this;

	}

	multiplyScalar( s ) {

		this.r *= s;
		this.g *= s;
		this.b *= s;

		return this;

	}

	lerp( color, alpha ) {

		this.r += ( color.r - this.r ) * alpha;
		this.g += ( color.g - this.g ) * alpha;
		this.b += ( color.b - this.b ) * alpha;

		return this;

	}

	lerpColors( color1, color2, alpha ) {

		this.r = color1.r + ( color2.r - color1.r ) * alpha;
		this.g = color1.g + ( color2.g - color1.g ) * alpha;
		this.b = color1.b + ( color2.b - color1.b ) * alpha;

		return this;

	}

	lerpHSL( color, alpha ) {

		this.getHSL( _hslA );
		color.getHSL( _hslB );

		const h = lerp( _hslA.h, _hslB.h, alpha );
		const s = lerp( _hslA.s, _hslB.s, alpha );
		const l = lerp( _hslA.l, _hslB.l, alpha );

		this.setHSL( h, s, l );

		return this;

	}

	setFromVector3( v ) {

		this.r = v.x;
		this.g = v.y;
		this.b = v.z;

		return this;

	}

	applyMatrix3( m ) {

		const r = this.r, g = this.g, b = this.b;
		const e = m.elements;

		this.r = e[ 0 ] * r + e[ 3 ] * g + e[ 6 ] * b;
		this.g = e[ 1 ] * r + e[ 4 ] * g + e[ 7 ] * b;
		this.b = e[ 2 ] * r + e[ 5 ] * g + e[ 8 ] * b;

		return this;

	}

	equals( c ) {

		return ( c.r === this.r ) && ( c.g === this.g ) && ( c.b === this.b );

	}

	fromArray( array, offset = 0 ) {

		this.r = array[ offset ];
		this.g = array[ offset + 1 ];
		this.b = array[ offset + 2 ];

		return this;

	}

	toArray( array = [], offset = 0 ) {

		array[ offset ] = this.r;
		array[ offset + 1 ] = this.g;
		array[ offset + 2 ] = this.b;

		return array;

	}

	fromBufferAttribute( attribute, index ) {

		this.r = attribute.getX( index );
		this.g = attribute.getY( index );
		this.b = attribute.getZ( index );

		return this;

	}

	toJSON() {

		return this.getHex();

	}

	*[ Symbol.iterator ]() {

		yield this.r;
		yield this.g;
		yield this.b;

	}

}

const _color = /*@__PURE__*/ new Color();

Color.NAMES = _colorKeywords;

let _materialId = 0;

class Material extends EventDispatcher {

	constructor() {

		super();

		this.isMaterial = true;

		Object.defineProperty( this, 'id', { value: _materialId ++ } );

		this.uuid = generateUUID();

		this.name = '';
		this.type = 'Material';

		this.blending = NormalBlending;
		this.side = FrontSide;
		this.vertexColors = false;

		this.opacity = 1;
		this.transparent = false;
		this.alphaHash = false;

		this.blendSrc = SrcAlphaFactor;
		this.blendDst = OneMinusSrcAlphaFactor;
		this.blendEquation = AddEquation;
		this.blendSrcAlpha = null;
		this.blendDstAlpha = null;
		this.blendEquationAlpha = null;
		this.blendColor = new Color( 0, 0, 0 );
		this.blendAlpha = 0;

		this.depthFunc = LessEqualDepth;
		this.depthTest = true;
		this.depthWrite = true;

		this.stencilWriteMask = 0xff;
		this.stencilFunc = AlwaysStencilFunc;
		this.stencilRef = 0;
		this.stencilFuncMask = 0xff;
		this.stencilFail = KeepStencilOp;
		this.stencilZFail = KeepStencilOp;
		this.stencilZPass = KeepStencilOp;
		this.stencilWrite = false;

		this.clippingPlanes = null;
		this.clipIntersection = false;
		this.clipShadows = false;

		this.shadowSide = null;

		this.colorWrite = true;

		this.precision = null; // override the renderer's default precision for this material

		this.polygonOffset = false;
		this.polygonOffsetFactor = 0;
		this.polygonOffsetUnits = 0;

		this.dithering = false;

		this.alphaToCoverage = false;
		this.premultipliedAlpha = false;
		this.forceSinglePass = false;

		this.visible = true;

		this.toneMapped = true;

		this.userData = {};

		this.version = 0;

		this._alphaTest = 0;

	}

	get alphaTest() {

		return this._alphaTest;

	}

	set alphaTest( value ) {

		if ( this._alphaTest > 0 !== value > 0 ) {

			this.version ++;

		}

		this._alphaTest = value;

	}

	onBeforeCompile( /* shaderobject, renderer */ ) {}

	customProgramCacheKey() {

		return this.onBeforeCompile.toString();

	}

	setValues( values ) {

		if ( values === undefined ) return;

		for ( const key in values ) {

			const newValue = values[ key ];

			if ( newValue === undefined ) {

				console.warn( `THREE.Material: parameter '${ key }' has value of undefined.` );
				continue;

			}

			const currentValue = this[ key ];

			if ( currentValue === undefined ) {

				console.warn( `THREE.Material: '${ key }' is not a property of THREE.${ this.type }.` );
				continue;

			}

			if ( currentValue && currentValue.isColor ) {

				currentValue.set( newValue );

			} else if ( ( currentValue && currentValue.isVector3 ) && ( newValue && newValue.isVector3 ) ) {

				currentValue.copy( newValue );

			} else {

				this[ key ] = newValue;

			}

		}

	}

	toJSON( meta ) {

		const isRootObject = ( meta === undefined || typeof meta === 'string' );

		if ( isRootObject ) {

			meta = {
				textures: {},
				images: {}
			};

		}

		const data = {
			metadata: {
				version: 4.6,
				type: 'Material',
				generator: 'Material.toJSON'
			}
		};

		// standard Material serialization
		data.uuid = this.uuid;
		data.type = this.type;

		if ( this.name !== '' ) data.name = this.name;

		if ( this.color && this.color.isColor ) data.color = this.color.getHex();

		if ( this.roughness !== undefined ) data.roughness = this.roughness;
		if ( this.metalness !== undefined ) data.metalness = this.metalness;

		if ( this.sheen !== undefined ) data.sheen = this.sheen;
		if ( this.sheenColor && this.sheenColor.isColor ) data.sheenColor = this.sheenColor.getHex();
		if ( this.sheenRoughness !== undefined ) data.sheenRoughness = this.sheenRoughness;
		if ( this.emissive && this.emissive.isColor ) data.emissive = this.emissive.getHex();
		if ( this.emissiveIntensity !== undefined && this.emissiveIntensity !== 1 ) data.emissiveIntensity = this.emissiveIntensity;

		if ( this.specular && this.specular.isColor ) data.specular = this.specular.getHex();
		if ( this.specularIntensity !== undefined ) data.specularIntensity = this.specularIntensity;
		if ( this.specularColor && this.specularColor.isColor ) data.specularColor = this.specularColor.getHex();
		if ( this.shininess !== undefined ) data.shininess = this.shininess;
		if ( this.clearcoat !== undefined ) data.clearcoat = this.clearcoat;
		if ( this.clearcoatRoughness !== undefined ) data.clearcoatRoughness = this.clearcoatRoughness;

		if ( this.clearcoatMap && this.clearcoatMap.isTexture ) {

			data.clearcoatMap = this.clearcoatMap.toJSON( meta ).uuid;

		}

		if ( this.clearcoatRoughnessMap && this.clearcoatRoughnessMap.isTexture ) {

			data.clearcoatRoughnessMap = this.clearcoatRoughnessMap.toJSON( meta ).uuid;

		}

		if ( this.clearcoatNormalMap && this.clearcoatNormalMap.isTexture ) {

			data.clearcoatNormalMap = this.clearcoatNormalMap.toJSON( meta ).uuid;
			data.clearcoatNormalScale = this.clearcoatNormalScale.toArray();

		}

		if ( this.dispersion !== undefined ) data.dispersion = this.dispersion;

		if ( this.iridescence !== undefined ) data.iridescence = this.iridescence;
		if ( this.iridescenceIOR !== undefined ) data.iridescenceIOR = this.iridescenceIOR;
		if ( this.iridescenceThicknessRange !== undefined ) data.iridescenceThicknessRange = this.iridescenceThicknessRange;

		if ( this.iridescenceMap && this.iridescenceMap.isTexture ) {

			data.iridescenceMap = this.iridescenceMap.toJSON( meta ).uuid;

		}

		if ( this.iridescenceThicknessMap && this.iridescenceThicknessMap.isTexture ) {

			data.iridescenceThicknessMap = this.iridescenceThicknessMap.toJSON( meta ).uuid;

		}

		if ( this.anisotropy !== undefined ) data.anisotropy = this.anisotropy;
		if ( this.anisotropyRotation !== undefined ) data.anisotropyRotation = this.anisotropyRotation;

		if ( this.anisotropyMap && this.anisotropyMap.isTexture ) {

			data.anisotropyMap = this.anisotropyMap.toJSON( meta ).uuid;

		}

		if ( this.map && this.map.isTexture ) data.map = this.map.toJSON( meta ).uuid;
		if ( this.matcap && this.matcap.isTexture ) data.matcap = this.matcap.toJSON( meta ).uuid;
		if ( this.alphaMap && this.alphaMap.isTexture ) data.alphaMap = this.alphaMap.toJSON( meta ).uuid;

		if ( this.lightMap && this.lightMap.isTexture ) {

			data.lightMap = this.lightMap.toJSON( meta ).uuid;
			data.lightMapIntensity = this.lightMapIntensity;

		}

		if ( this.aoMap && this.aoMap.isTexture ) {

			data.aoMap = this.aoMap.toJSON( meta ).uuid;
			data.aoMapIntensity = this.aoMapIntensity;

		}

		if ( this.bumpMap && this.bumpMap.isTexture ) {

			data.bumpMap = this.bumpMap.toJSON( meta ).uuid;
			data.bumpScale = this.bumpScale;

		}

		if ( this.normalMap && this.normalMap.isTexture ) {

			data.normalMap = this.normalMap.toJSON( meta ).uuid;
			data.normalMapType = this.normalMapType;
			data.normalScale = this.normalScale.toArray();

		}

		if ( this.displacementMap && this.displacementMap.isTexture ) {

			data.displacementMap = this.displacementMap.toJSON( meta ).uuid;
			data.displacementScale = this.displacementScale;
			data.displacementBias = this.displacementBias;

		}

		if ( this.roughnessMap && this.roughnessMap.isTexture ) data.roughnessMap = this.roughnessMap.toJSON( meta ).uuid;
		if ( this.metalnessMap && this.metalnessMap.isTexture ) data.metalnessMap = this.metalnessMap.toJSON( meta ).uuid;

		if ( this.emissiveMap && this.emissiveMap.isTexture ) data.emissiveMap = this.emissiveMap.toJSON( meta ).uuid;
		if ( this.specularMap && this.specularMap.isTexture ) data.specularMap = this.specularMap.toJSON( meta ).uuid;
		if ( this.specularIntensityMap && this.specularIntensityMap.isTexture ) data.specularIntensityMap = this.specularIntensityMap.toJSON( meta ).uuid;
		if ( this.specularColorMap && this.specularColorMap.isTexture ) data.specularColorMap = this.specularColorMap.toJSON( meta ).uuid;

		if ( this.envMap && this.envMap.isTexture ) {

			data.envMap = this.envMap.toJSON( meta ).uuid;

			if ( this.combine !== undefined ) data.combine = this.combine;

		}

		if ( this.envMapRotation !== undefined ) data.envMapRotation = this.envMapRotation.toArray();
		if ( this.envMapIntensity !== undefined ) data.envMapIntensity = this.envMapIntensity;
		if ( this.reflectivity !== undefined ) data.reflectivity = this.reflectivity;
		if ( this.refractionRatio !== undefined ) data.refractionRatio = this.refractionRatio;

		if ( this.gradientMap && this.gradientMap.isTexture ) {

			data.gradientMap = this.gradientMap.toJSON( meta ).uuid;

		}

		if ( this.transmission !== undefined ) data.transmission = this.transmission;
		if ( this.transmissionMap && this.transmissionMap.isTexture ) data.transmissionMap = this.transmissionMap.toJSON( meta ).uuid;
		if ( this.thickness !== undefined ) data.thickness = this.thickness;
		if ( this.thicknessMap && this.thicknessMap.isTexture ) data.thicknessMap = this.thicknessMap.toJSON( meta ).uuid;
		if ( this.attenuationDistance !== undefined && this.attenuationDistance !== Infinity ) data.attenuationDistance = this.attenuationDistance;
		if ( this.attenuationColor !== undefined ) data.attenuationColor = this.attenuationColor.getHex();

		if ( this.size !== undefined ) data.size = this.size;
		if ( this.shadowSide !== null ) data.shadowSide = this.shadowSide;
		if ( this.sizeAttenuation !== undefined ) data.sizeAttenuation = this.sizeAttenuation;

		if ( this.blending !== NormalBlending ) data.blending = this.blending;
		if ( this.side !== FrontSide ) data.side = this.side;
		if ( this.vertexColors === true ) data.vertexColors = true;

		if ( this.opacity < 1 ) data.opacity = this.opacity;
		if ( this.transparent === true ) data.transparent = true;

		if ( this.blendSrc !== SrcAlphaFactor ) data.blendSrc = this.blendSrc;
		if ( this.blendDst !== OneMinusSrcAlphaFactor ) data.blendDst = this.blendDst;
		if ( this.blendEquation !== AddEquation ) data.blendEquation = this.blendEquation;
		if ( this.blendSrcAlpha !== null ) data.blendSrcAlpha = this.blendSrcAlpha;
		if ( this.blendDstAlpha !== null ) data.blendDstAlpha = this.blendDstAlpha;
		if ( this.blendEquationAlpha !== null ) data.blendEquationAlpha = this.blendEquationAlpha;
		if ( this.blendColor && this.blendColor.isColor ) data.blendColor = this.blendColor.getHex();
		if ( this.blendAlpha !== 0 ) data.blendAlpha = this.blendAlpha;

		if ( this.depthFunc !== LessEqualDepth ) data.depthFunc = this.depthFunc;
		if ( this.depthTest === false ) data.depthTest = this.depthTest;
		if ( this.depthWrite === false ) data.depthWrite = this.depthWrite;
		if ( this.colorWrite === false ) data.colorWrite = this.colorWrite;

		if ( this.stencilWriteMask !== 0xff ) data.stencilWriteMask = this.stencilWriteMask;
		if ( this.stencilFunc !== AlwaysStencilFunc ) data.stencilFunc = this.stencilFunc;
		if ( this.stencilRef !== 0 ) data.stencilRef = this.stencilRef;
		if ( this.stencilFuncMask !== 0xff ) data.stencilFuncMask = this.stencilFuncMask;
		if ( this.stencilFail !== KeepStencilOp ) data.stencilFail = this.stencilFail;
		if ( this.stencilZFail !== KeepStencilOp ) data.stencilZFail = this.stencilZFail;
		if ( this.stencilZPass !== KeepStencilOp ) data.stencilZPass = this.stencilZPass;
		if ( this.stencilWrite === true ) data.stencilWrite = this.stencilWrite;

		// rotation (SpriteMaterial)
		if ( this.rotation !== undefined && this.rotation !== 0 ) data.rotation = this.rotation;

		if ( this.polygonOffset === true ) data.polygonOffset = true;
		if ( this.polygonOffsetFactor !== 0 ) data.polygonOffsetFactor = this.polygonOffsetFactor;
		if ( this.polygonOffsetUnits !== 0 ) data.polygonOffsetUnits = this.polygonOffsetUnits;

		if ( this.linewidth !== undefined && this.linewidth !== 1 ) data.linewidth = this.linewidth;
		if ( this.dashSize !== undefined ) data.dashSize = this.dashSize;
		if ( this.gapSize !== undefined ) data.gapSize = this.gapSize;
		if ( this.scale !== undefined ) data.scale = this.scale;

		if ( this.dithering === true ) data.dithering = true;

		if ( this.alphaTest > 0 ) data.alphaTest = this.alphaTest;
		if ( this.alphaHash === true ) data.alphaHash = true;
		if ( this.alphaToCoverage === true ) data.alphaToCoverage = true;
		if ( this.premultipliedAlpha === true ) data.premultipliedAlpha = true;
		if ( this.forceSinglePass === true ) data.forceSinglePass = true;

		if ( this.wireframe === true ) data.wireframe = true;
		if ( this.wireframeLinewidth > 1 ) data.wireframeLinewidth = this.wireframeLinewidth;
		if ( this.wireframeLinecap !== 'round' ) data.wireframeLinecap = this.wireframeLinecap;
		if ( this.wireframeLinejoin !== 'round' ) data.wireframeLinejoin = this.wireframeLinejoin;

		if ( this.flatShading === true ) data.flatShading = true;

		if ( this.visible === false ) data.visible = false;

		if ( this.toneMapped === false ) data.toneMapped = false;

		if ( this.fog === false ) data.fog = false;

		if ( Object.keys( this.userData ).length > 0 ) data.userData = this.userData;

		// TODO: Copied from Object3D.toJSON

		function extractFromCache( cache ) {

			const values = [];

			for ( const key in cache ) {

				const data = cache[ key ];
				delete data.metadata;
				values.push( data );

			}

			return values;

		}

		if ( isRootObject ) {

			const textures = extractFromCache( meta.textures );
			const images = extractFromCache( meta.images );

			if ( textures.length > 0 ) data.textures = textures;
			if ( images.length > 0 ) data.images = images;

		}

		return data;

	}

	clone() {

		return new this.constructor().copy( this );

	}

	copy( source ) {

		this.name = source.name;

		this.blending = source.blending;
		this.side = source.side;
		this.vertexColors = source.vertexColors;

		this.opacity = source.opacity;
		this.transparent = source.transparent;

		this.blendSrc = source.blendSrc;
		this.blendDst = source.blendDst;
		this.blendEquation = source.blendEquation;
		this.blendSrcAlpha = source.blendSrcAlpha;
		this.blendDstAlpha = source.blendDstAlpha;
		this.blendEquationAlpha = source.blendEquationAlpha;
		this.blendColor.copy( source.blendColor );
		this.blendAlpha = source.blendAlpha;

		this.depthFunc = source.depthFunc;
		this.depthTest = source.depthTest;
		this.depthWrite = source.depthWrite;

		this.stencilWriteMask = source.stencilWriteMask;
		this.stencilFunc = source.stencilFunc;
		this.stencilRef = source.stencilRef;
		this.stencilFuncMask = source.stencilFuncMask;
		this.stencilFail = source.stencilFail;
		this.stencilZFail = source.stencilZFail;
		this.stencilZPass = source.stencilZPass;
		this.stencilWrite = source.stencilWrite;

		const srcPlanes = source.clippingPlanes;
		let dstPlanes = null;

		if ( srcPlanes !== null ) {

			const n = srcPlanes.length;
			dstPlanes = new Array( n );

			for ( let i = 0; i !== n; ++ i ) {

				dstPlanes[ i ] = srcPlanes[ i ].clone();

			}

		}

		this.clippingPlanes = dstPlanes;
		this.clipIntersection = source.clipIntersection;
		this.clipShadows = source.clipShadows;

		this.shadowSide = source.shadowSide;

		this.colorWrite = source.colorWrite;

		this.precision = source.precision;

		this.polygonOffset = source.polygonOffset;
		this.polygonOffsetFactor = source.polygonOffsetFactor;
		this.polygonOffsetUnits = source.polygonOffsetUnits;

		this.dithering = source.dithering;

		this.alphaTest = source.alphaTest;
		this.alphaHash = source.alphaHash;
		this.alphaToCoverage = source.alphaToCoverage;
		this.premultipliedAlpha = source.premultipliedAlpha;
		this.forceSinglePass = source.forceSinglePass;

		this.visible = source.visible;

		this.toneMapped = source.toneMapped;

		this.userData = JSON.parse( JSON.stringify( source.userData ) );

		return this;

	}

	dispose() {

		this.dispatchEvent( { type: 'dispose' } );

	}

	set needsUpdate( value ) {

		if ( value === true ) this.version ++;

	}

	onBuild( /* shaderobject, renderer */ ) {

		console.warn( 'Material: onBuild() has been removed.' ); // @deprecated, r166

	}

	onBeforeRender( /* renderer, scene, camera, geometry, object, group */ ) {

		console.warn( 'Material: onBeforeRender() has been removed.' ); // @deprecated, r166

	}


}

class MeshBasicMaterial extends Material {

	constructor( parameters ) {

		super();

		this.isMeshBasicMaterial = true;

		this.type = 'MeshBasicMaterial';

		this.color = new Color( 0xffffff ); // emissive

		this.map = null;

		this.lightMap = null;
		this.lightMapIntensity = 1.0;

		this.aoMap = null;
		this.aoMapIntensity = 1.0;

		this.specularMap = null;

		this.alphaMap = null;

		this.envMap = null;
		this.envMapRotation = new Euler();
		this.combine = MultiplyOperation;
		this.reflectivity = 1;
		this.refractionRatio = 0.98;

		this.wireframe = false;
		this.wireframeLinewidth = 1;
		this.wireframeLinecap = 'round';
		this.wireframeLinejoin = 'round';

		this.fog = true;

		this.setValues( parameters );

	}

	copy( source ) {

		super.copy( source );

		this.color.copy( source.color );

		this.map = source.map;

		this.lightMap = source.lightMap;
		this.lightMapIntensity = source.lightMapIntensity;

		this.aoMap = source.aoMap;
		this.aoMapIntensity = source.aoMapIntensity;

		this.specularMap = source.specularMap;

		this.alphaMap = source.alphaMap;

		this.envMap = source.envMap;
		this.envMapRotation.copy( source.envMapRotation );
		this.combine = source.combine;
		this.reflectivity = source.reflectivity;
		this.refractionRatio = source.refractionRatio;

		this.wireframe = source.wireframe;
		this.wireframeLinewidth = source.wireframeLinewidth;
		this.wireframeLinecap = source.wireframeLinecap;
		this.wireframeLinejoin = source.wireframeLinejoin;

		this.fog = source.fog;

		return this;

	}

}

// Fast Half Float Conversions, http://www.fox-toolkit.org/ftp/fasthalffloatconversion.pdf

const _tables = /*@__PURE__*/ _generateTables();

function _generateTables() {

	// float32 to float16 helpers

	const buffer = new ArrayBuffer( 4 );
	const floatView = new Float32Array( buffer );
	const uint32View = new Uint32Array( buffer );

	const baseTable = new Uint32Array( 512 );
	const shiftTable = new Uint32Array( 512 );

	for ( let i = 0; i < 256; ++ i ) {

		const e = i - 127;

		// very small number (0, -0)

		if ( e < - 27 ) {

			baseTable[ i ] = 0x0000;
			baseTable[ i | 0x100 ] = 0x8000;
			shiftTable[ i ] = 24;
			shiftTable[ i | 0x100 ] = 24;

			// small number (denorm)

		} else if ( e < - 14 ) {

			baseTable[ i ] = 0x0400 >> ( - e - 14 );
			baseTable[ i | 0x100 ] = ( 0x0400 >> ( - e - 14 ) ) | 0x8000;
			shiftTable[ i ] = - e - 1;
			shiftTable[ i | 0x100 ] = - e - 1;

			// normal number

		} else if ( e <= 15 ) {

			baseTable[ i ] = ( e + 15 ) << 10;
			baseTable[ i | 0x100 ] = ( ( e + 15 ) << 10 ) | 0x8000;
			shiftTable[ i ] = 13;
			shiftTable[ i | 0x100 ] = 13;

			// large number (Infinity, -Infinity)

		} else if ( e < 128 ) {

			baseTable[ i ] = 0x7c00;
			baseTable[ i | 0x100 ] = 0xfc00;
			shiftTable[ i ] = 24;
			shiftTable[ i | 0x100 ] = 24;

			// stay (NaN, Infinity, -Infinity)

		} else {

			baseTable[ i ] = 0x7c00;
			baseTable[ i | 0x100 ] = 0xfc00;
			shiftTable[ i ] = 13;
			shiftTable[ i | 0x100 ] = 13;

		}

	}

	// float16 to float32 helpers

	const mantissaTable = new Uint32Array( 2048 );
	const exponentTable = new Uint32Array( 64 );
	const offsetTable = new Uint32Array( 64 );

	for ( let i = 1; i < 1024; ++ i ) {

		let m = i << 13; // zero pad mantissa bits
		let e = 0; // zero exponent

		// normalized
		while ( ( m & 0x00800000 ) === 0 ) {

			m <<= 1;
			e -= 0x00800000; // decrement exponent

		}

		m &= ~ 0x00800000; // clear leading 1 bit
		e += 0x38800000; // adjust bias

		mantissaTable[ i ] = m | e;

	}

	for ( let i = 1024; i < 2048; ++ i ) {

		mantissaTable[ i ] = 0x38000000 + ( ( i - 1024 ) << 13 );

	}

	for ( let i = 1; i < 31; ++ i ) {

		exponentTable[ i ] = i << 23;

	}

	exponentTable[ 31 ] = 0x47800000;
	exponentTable[ 32 ] = 0x80000000;

	for ( let i = 33; i < 63; ++ i ) {

		exponentTable[ i ] = 0x80000000 + ( ( i - 32 ) << 23 );

	}

	exponentTable[ 63 ] = 0xc7800000;

	for ( let i = 1; i < 64; ++ i ) {

		if ( i !== 32 ) {

			offsetTable[ i ] = 1024;

		}

	}

	return {
		floatView: floatView,
		uint32View: uint32View,
		baseTable: baseTable,
		shiftTable: shiftTable,
		mantissaTable: mantissaTable,
		exponentTable: exponentTable,
		offsetTable: offsetTable
	};

}

// float32 to float16

function toHalfFloat( val ) {

	if ( Math.abs( val ) > 65504 ) console.warn( 'THREE.DataUtils.toHalfFloat(): Value out of range.' );

	val = clamp$1( val, - 65504, 65504 );

	_tables.floatView[ 0 ] = val;
	const f = _tables.uint32View[ 0 ];
	const e = ( f >> 23 ) & 0x1ff;
	return _tables.baseTable[ e ] + ( ( f & 0x007fffff ) >> _tables.shiftTable[ e ] );

}

// float16 to float32

function fromHalfFloat( val ) {

	const m = val >> 10;
	_tables.uint32View[ 0 ] = _tables.mantissaTable[ _tables.offsetTable[ m ] + ( val & 0x3ff ) ] + _tables.exponentTable[ m ];
	return _tables.floatView[ 0 ];

}

const DataUtils = {
	toHalfFloat: toHalfFloat,
	fromHalfFloat: fromHalfFloat,
};

const _vector$9 = /*@__PURE__*/ new Vector3();
const _vector2$1 = /*@__PURE__*/ new Vector2();

class BufferAttribute {

	constructor( array, itemSize, normalized = false ) {

		if ( Array.isArray( array ) ) {

			throw new TypeError( 'THREE.BufferAttribute: array should be a Typed Array.' );

		}

		this.isBufferAttribute = true;

		this.name = '';

		this.array = array;
		this.itemSize = itemSize;
		this.count = array !== undefined ? array.length / itemSize : 0;
		this.normalized = normalized;

		this.usage = StaticDrawUsage;
		this._updateRange = { offset: 0, count: - 1 };
		this.updateRanges = [];
		this.gpuType = FloatType;

		this.version = 0;

	}

	onUploadCallback() {}

	set needsUpdate( value ) {

		if ( value === true ) this.version ++;

	}

	get updateRange() {

		warnOnce( 'THREE.BufferAttribute: updateRange() is deprecated and will be removed in r169. Use addUpdateRange() instead.' ); // @deprecated, r159
		return this._updateRange;

	}

	setUsage( value ) {

		this.usage = value;

		return this;

	}

	addUpdateRange( start, count ) {

		this.updateRanges.push( { start, count } );

	}

	clearUpdateRanges() {

		this.updateRanges.length = 0;

	}

	copy( source ) {

		this.name = source.name;
		this.array = new source.array.constructor( source.array );
		this.itemSize = source.itemSize;
		this.count = source.count;
		this.normalized = source.normalized;

		this.usage = source.usage;
		this.gpuType = source.gpuType;

		return this;

	}

	copyAt( index1, attribute, index2 ) {

		index1 *= this.itemSize;
		index2 *= attribute.itemSize;

		for ( let i = 0, l = this.itemSize; i < l; i ++ ) {

			this.array[ index1 + i ] = attribute.array[ index2 + i ];

		}

		return this;

	}

	copyArray( array ) {

		this.array.set( array );

		return this;

	}

	applyMatrix3( m ) {

		if ( this.itemSize === 2 ) {

			for ( let i = 0, l = this.count; i < l; i ++ ) {

				_vector2$1.fromBufferAttribute( this, i );
				_vector2$1.applyMatrix3( m );

				this.setXY( i, _vector2$1.x, _vector2$1.y );

			}

		} else if ( this.itemSize === 3 ) {

			for ( let i = 0, l = this.count; i < l; i ++ ) {

				_vector$9.fromBufferAttribute( this, i );
				_vector$9.applyMatrix3( m );

				this.setXYZ( i, _vector$9.x, _vector$9.y, _vector$9.z );

			}

		}

		return this;

	}

	applyMatrix4( m ) {

		for ( let i = 0, l = this.count; i < l; i ++ ) {

			_vector$9.fromBufferAttribute( this, i );

			_vector$9.applyMatrix4( m );

			this.setXYZ( i, _vector$9.x, _vector$9.y, _vector$9.z );

		}

		return this;

	}

	applyNormalMatrix( m ) {

		for ( let i = 0, l = this.count; i < l; i ++ ) {

			_vector$9.fromBufferAttribute( this, i );

			_vector$9.applyNormalMatrix( m );

			this.setXYZ( i, _vector$9.x, _vector$9.y, _vector$9.z );

		}

		return this;

	}

	transformDirection( m ) {

		for ( let i = 0, l = this.count; i < l; i ++ ) {

			_vector$9.fromBufferAttribute( this, i );

			_vector$9.transformDirection( m );

			this.setXYZ( i, _vector$9.x, _vector$9.y, _vector$9.z );

		}

		return this;

	}

	set( value, offset = 0 ) {

		// Matching BufferAttribute constructor, do not normalize the array.
		this.array.set( value, offset );

		return this;

	}

	getComponent( index, component ) {

		let value = this.array[ index * this.itemSize + component ];

		if ( this.normalized ) value = denormalize( value, this.array );

		return value;

	}

	setComponent( index, component, value ) {

		if ( this.normalized ) value = normalize$1( value, this.array );

		this.array[ index * this.itemSize + component ] = value;

		return this;

	}

	getX( index ) {

		let x = this.array[ index * this.itemSize ];

		if ( this.normalized ) x = denormalize( x, this.array );

		return x;

	}

	setX( index, x ) {

		if ( this.normalized ) x = normalize$1( x, this.array );

		this.array[ index * this.itemSize ] = x;

		return this;

	}

	getY( index ) {

		let y = this.array[ index * this.itemSize + 1 ];

		if ( this.normalized ) y = denormalize( y, this.array );

		return y;

	}

	setY( index, y ) {

		if ( this.normalized ) y = normalize$1( y, this.array );

		this.array[ index * this.itemSize + 1 ] = y;

		return this;

	}

	getZ( index ) {

		let z = this.array[ index * this.itemSize + 2 ];

		if ( this.normalized ) z = denormalize( z, this.array );

		return z;

	}

	setZ( index, z ) {

		if ( this.normalized ) z = normalize$1( z, this.array );

		this.array[ index * this.itemSize + 2 ] = z;

		return this;

	}

	getW( index ) {

		let w = this.array[ index * this.itemSize + 3 ];

		if ( this.normalized ) w = denormalize( w, this.array );

		return w;

	}

	setW( index, w ) {

		if ( this.normalized ) w = normalize$1( w, this.array );

		this.array[ index * this.itemSize + 3 ] = w;

		return this;

	}

	setXY( index, x, y ) {

		index *= this.itemSize;

		if ( this.normalized ) {

			x = normalize$1( x, this.array );
			y = normalize$1( y, this.array );

		}

		this.array[ index + 0 ] = x;
		this.array[ index + 1 ] = y;

		return this;

	}

	setXYZ( index, x, y, z ) {

		index *= this.itemSize;

		if ( this.normalized ) {

			x = normalize$1( x, this.array );
			y = normalize$1( y, this.array );
			z = normalize$1( z, this.array );

		}

		this.array[ index + 0 ] = x;
		this.array[ index + 1 ] = y;
		this.array[ index + 2 ] = z;

		return this;

	}

	setXYZW( index, x, y, z, w ) {

		index *= this.itemSize;

		if ( this.normalized ) {

			x = normalize$1( x, this.array );
			y = normalize$1( y, this.array );
			z = normalize$1( z, this.array );
			w = normalize$1( w, this.array );

		}

		this.array[ index + 0 ] = x;
		this.array[ index + 1 ] = y;
		this.array[ index + 2 ] = z;
		this.array[ index + 3 ] = w;

		return this;

	}

	onUpload( callback ) {

		this.onUploadCallback = callback;

		return this;

	}

	clone() {

		return new this.constructor( this.array, this.itemSize ).copy( this );

	}

	toJSON() {

		const data = {
			itemSize: this.itemSize,
			type: this.array.constructor.name,
			array: Array.from( this.array ),
			normalized: this.normalized
		};

		if ( this.name !== '' ) data.name = this.name;
		if ( this.usage !== StaticDrawUsage ) data.usage = this.usage;

		return data;

	}

}

//

class Int8BufferAttribute extends BufferAttribute {

	constructor( array, itemSize, normalized ) {

		super( new Int8Array( array ), itemSize, normalized );

	}

}

class Uint8BufferAttribute extends BufferAttribute {

	constructor( array, itemSize, normalized ) {

		super( new Uint8Array( array ), itemSize, normalized );

	}

}

class Uint8ClampedBufferAttribute extends BufferAttribute {

	constructor( array, itemSize, normalized ) {

		super( new Uint8ClampedArray( array ), itemSize, normalized );

	}

}

class Int16BufferAttribute extends BufferAttribute {

	constructor( array, itemSize, normalized ) {

		super( new Int16Array( array ), itemSize, normalized );

	}

}

class Uint16BufferAttribute extends BufferAttribute {

	constructor( array, itemSize, normalized ) {

		super( new Uint16Array( array ), itemSize, normalized );

	}

}

class Int32BufferAttribute extends BufferAttribute {

	constructor( array, itemSize, normalized ) {

		super( new Int32Array( array ), itemSize, normalized );

	}

}

class Uint32BufferAttribute extends BufferAttribute {

	constructor( array, itemSize, normalized ) {

		super( new Uint32Array( array ), itemSize, normalized );

	}

}

class Float16BufferAttribute extends BufferAttribute {

	constructor( array, itemSize, normalized ) {

		super( new Uint16Array( array ), itemSize, normalized );

		this.isFloat16BufferAttribute = true;

	}

	getX( index ) {

		let x = fromHalfFloat( this.array[ index * this.itemSize ] );

		if ( this.normalized ) x = denormalize( x, this.array );

		return x;

	}

	setX( index, x ) {

		if ( this.normalized ) x = normalize$1( x, this.array );

		this.array[ index * this.itemSize ] = toHalfFloat( x );

		return this;

	}

	getY( index ) {

		let y = fromHalfFloat( this.array[ index * this.itemSize + 1 ] );

		if ( this.normalized ) y = denormalize( y, this.array );

		return y;

	}

	setY( index, y ) {

		if ( this.normalized ) y = normalize$1( y, this.array );

		this.array[ index * this.itemSize + 1 ] = toHalfFloat( y );

		return this;

	}

	getZ( index ) {

		let z = fromHalfFloat( this.array[ index * this.itemSize + 2 ] );

		if ( this.normalized ) z = denormalize( z, this.array );

		return z;

	}

	setZ( index, z ) {

		if ( this.normalized ) z = normalize$1( z, this.array );

		this.array[ index * this.itemSize + 2 ] = toHalfFloat( z );

		return this;

	}

	getW( index ) {

		let w = fromHalfFloat( this.array[ index * this.itemSize + 3 ] );

		if ( this.normalized ) w = denormalize( w, this.array );

		return w;

	}

	setW( index, w ) {

		if ( this.normalized ) w = normalize$1( w, this.array );

		this.array[ index * this.itemSize + 3 ] = toHalfFloat( w );

		return this;

	}

	setXY( index, x, y ) {

		index *= this.itemSize;

		if ( this.normalized ) {

			x = normalize$1( x, this.array );
			y = normalize$1( y, this.array );

		}

		this.array[ index + 0 ] = toHalfFloat( x );
		this.array[ index + 1 ] = toHalfFloat( y );

		return this;

	}

	setXYZ( index, x, y, z ) {

		index *= this.itemSize;

		if ( this.normalized ) {

			x = normalize$1( x, this.array );
			y = normalize$1( y, this.array );
			z = normalize$1( z, this.array );

		}

		this.array[ index + 0 ] = toHalfFloat( x );
		this.array[ index + 1 ] = toHalfFloat( y );
		this.array[ index + 2 ] = toHalfFloat( z );

		return this;

	}

	setXYZW( index, x, y, z, w ) {

		index *= this.itemSize;

		if ( this.normalized ) {

			x = normalize$1( x, this.array );
			y = normalize$1( y, this.array );
			z = normalize$1( z, this.array );
			w = normalize$1( w, this.array );

		}

		this.array[ index + 0 ] = toHalfFloat( x );
		this.array[ index + 1 ] = toHalfFloat( y );
		this.array[ index + 2 ] = toHalfFloat( z );
		this.array[ index + 3 ] = toHalfFloat( w );

		return this;

	}

}


class Float32BufferAttribute extends BufferAttribute {

	constructor( array, itemSize, normalized ) {

		super( new Float32Array( array ), itemSize, normalized );

	}

}

let _id$6 = 0;

const _m1 = /*@__PURE__*/ new Matrix4();
const _obj = /*@__PURE__*/ new Object3D();
const _offset = /*@__PURE__*/ new Vector3();
const _box$2 = /*@__PURE__*/ new Box3();
const _boxMorphTargets = /*@__PURE__*/ new Box3();
const _vector$8 = /*@__PURE__*/ new Vector3();

class BufferGeometry extends EventDispatcher {

	constructor() {

		super();

		this.isBufferGeometry = true;

		Object.defineProperty( this, 'id', { value: _id$6 ++ } );

		this.uuid = generateUUID();

		this.name = '';
		this.type = 'BufferGeometry';

		this.index = null;
		this.attributes = {};

		this.morphAttributes = {};
		this.morphTargetsRelative = false;

		this.groups = [];

		this.boundingBox = null;
		this.boundingSphere = null;

		this.drawRange = { start: 0, count: Infinity };

		this.userData = {};

	}

	getIndex() {

		return this.index;

	}

	setIndex( index ) {

		if ( Array.isArray( index ) ) {

			this.index = new ( arrayNeedsUint32$1( index ) ? Uint32BufferAttribute : Uint16BufferAttribute )( index, 1 );

		} else {

			this.index = index;

		}

		return this;

	}

	getAttribute( name ) {

		return this.attributes[ name ];

	}

	setAttribute( name, attribute ) {

		this.attributes[ name ] = attribute;

		return this;

	}

	deleteAttribute( name ) {

		delete this.attributes[ name ];

		return this;

	}

	hasAttribute( name ) {

		return this.attributes[ name ] !== undefined;

	}

	addGroup( start, count, materialIndex = 0 ) {

		this.groups.push( {

			start: start,
			count: count,
			materialIndex: materialIndex

		} );

	}

	clearGroups() {

		this.groups = [];

	}

	setDrawRange( start, count ) {

		this.drawRange.start = start;
		this.drawRange.count = count;

	}

	applyMatrix4( matrix ) {

		const position = this.attributes.position;

		if ( position !== undefined ) {

			position.applyMatrix4( matrix );

			position.needsUpdate = true;

		}

		const normal = this.attributes.normal;

		if ( normal !== undefined ) {

			const normalMatrix = new Matrix3().getNormalMatrix( matrix );

			normal.applyNormalMatrix( normalMatrix );

			normal.needsUpdate = true;

		}

		const tangent = this.attributes.tangent;

		if ( tangent !== undefined ) {

			tangent.transformDirection( matrix );

			tangent.needsUpdate = true;

		}

		if ( this.boundingBox !== null ) {

			this.computeBoundingBox();

		}

		if ( this.boundingSphere !== null ) {

			this.computeBoundingSphere();

		}

		return this;

	}

	applyQuaternion( q ) {

		_m1.makeRotationFromQuaternion( q );

		this.applyMatrix4( _m1 );

		return this;

	}

	rotateX( angle ) {

		// rotate geometry around world x-axis

		_m1.makeRotationX( angle );

		this.applyMatrix4( _m1 );

		return this;

	}

	rotateY( angle ) {

		// rotate geometry around world y-axis

		_m1.makeRotationY( angle );

		this.applyMatrix4( _m1 );

		return this;

	}

	rotateZ( angle ) {

		// rotate geometry around world z-axis

		_m1.makeRotationZ( angle );

		this.applyMatrix4( _m1 );

		return this;

	}

	translate( x, y, z ) {

		// translate geometry

		_m1.makeTranslation( x, y, z );

		this.applyMatrix4( _m1 );

		return this;

	}

	scale( x, y, z ) {

		// scale geometry

		_m1.makeScale( x, y, z );

		this.applyMatrix4( _m1 );

		return this;

	}

	lookAt( vector ) {

		_obj.lookAt( vector );

		_obj.updateMatrix();

		this.applyMatrix4( _obj.matrix );

		return this;

	}

	center() {

		this.computeBoundingBox();

		this.boundingBox.getCenter( _offset ).negate();

		this.translate( _offset.x, _offset.y, _offset.z );

		return this;

	}

	setFromPoints( points ) {

		const position = [];

		for ( let i = 0, l = points.length; i < l; i ++ ) {

			const point = points[ i ];
			position.push( point.x, point.y, point.z || 0 );

		}

		this.setAttribute( 'position', new Float32BufferAttribute( position, 3 ) );

		return this;

	}

	computeBoundingBox() {

		if ( this.boundingBox === null ) {

			this.boundingBox = new Box3();

		}

		const position = this.attributes.position;
		const morphAttributesPosition = this.morphAttributes.position;

		if ( position && position.isGLBufferAttribute ) {

			console.error( 'THREE.BufferGeometry.computeBoundingBox(): GLBufferAttribute requires a manual bounding box.', this );

			this.boundingBox.set(
				new Vector3( - Infinity, - Infinity, - Infinity ),
				new Vector3( + Infinity, + Infinity, + Infinity )
			);

			return;

		}

		if ( position !== undefined ) {

			this.boundingBox.setFromBufferAttribute( position );

			// process morph attributes if present

			if ( morphAttributesPosition ) {

				for ( let i = 0, il = morphAttributesPosition.length; i < il; i ++ ) {

					const morphAttribute = morphAttributesPosition[ i ];
					_box$2.setFromBufferAttribute( morphAttribute );

					if ( this.morphTargetsRelative ) {

						_vector$8.addVectors( this.boundingBox.min, _box$2.min );
						this.boundingBox.expandByPoint( _vector$8 );

						_vector$8.addVectors( this.boundingBox.max, _box$2.max );
						this.boundingBox.expandByPoint( _vector$8 );

					} else {

						this.boundingBox.expandByPoint( _box$2.min );
						this.boundingBox.expandByPoint( _box$2.max );

					}

				}

			}

		} else {

			this.boundingBox.makeEmpty();

		}

		if ( isNaN( this.boundingBox.min.x ) || isNaN( this.boundingBox.min.y ) || isNaN( this.boundingBox.min.z ) ) {

			console.error( 'THREE.BufferGeometry.computeBoundingBox(): Computed min/max have NaN values. The "position" attribute is likely to have NaN values.', this );

		}

	}

	computeBoundingSphere() {

		if ( this.boundingSphere === null ) {

			this.boundingSphere = new Sphere();

		}

		const position = this.attributes.position;
		const morphAttributesPosition = this.morphAttributes.position;

		if ( position && position.isGLBufferAttribute ) {

			console.error( 'THREE.BufferGeometry.computeBoundingSphere(): GLBufferAttribute requires a manual bounding sphere.', this );

			this.boundingSphere.set( new Vector3(), Infinity );

			return;

		}

		if ( position ) {

			// first, find the center of the bounding sphere

			const center = this.boundingSphere.center;

			_box$2.setFromBufferAttribute( position );

			// process morph attributes if present

			if ( morphAttributesPosition ) {

				for ( let i = 0, il = morphAttributesPosition.length; i < il; i ++ ) {

					const morphAttribute = morphAttributesPosition[ i ];
					_boxMorphTargets.setFromBufferAttribute( morphAttribute );

					if ( this.morphTargetsRelative ) {

						_vector$8.addVectors( _box$2.min, _boxMorphTargets.min );
						_box$2.expandByPoint( _vector$8 );

						_vector$8.addVectors( _box$2.max, _boxMorphTargets.max );
						_box$2.expandByPoint( _vector$8 );

					} else {

						_box$2.expandByPoint( _boxMorphTargets.min );
						_box$2.expandByPoint( _boxMorphTargets.max );

					}

				}

			}

			_box$2.getCenter( center );

			// second, try to find a boundingSphere with a radius smaller than the
			// boundingSphere of the boundingBox: sqrt(3) smaller in the best case

			let maxRadiusSq = 0;

			for ( let i = 0, il = position.count; i < il; i ++ ) {

				_vector$8.fromBufferAttribute( position, i );

				maxRadiusSq = Math.max( maxRadiusSq, center.distanceToSquared( _vector$8 ) );

			}

			// process morph attributes if present

			if ( morphAttributesPosition ) {

				for ( let i = 0, il = morphAttributesPosition.length; i < il; i ++ ) {

					const morphAttribute = morphAttributesPosition[ i ];
					const morphTargetsRelative = this.morphTargetsRelative;

					for ( let j = 0, jl = morphAttribute.count; j < jl; j ++ ) {

						_vector$8.fromBufferAttribute( morphAttribute, j );

						if ( morphTargetsRelative ) {

							_offset.fromBufferAttribute( position, j );
							_vector$8.add( _offset );

						}

						maxRadiusSq = Math.max( maxRadiusSq, center.distanceToSquared( _vector$8 ) );

					}

				}

			}

			this.boundingSphere.radius = Math.sqrt( maxRadiusSq );

			if ( isNaN( this.boundingSphere.radius ) ) {

				console.error( 'THREE.BufferGeometry.computeBoundingSphere(): Computed radius is NaN. The "position" attribute is likely to have NaN values.', this );

			}

		}

	}

	computeTangents() {

		const index = this.index;
		const attributes = this.attributes;

		// based on http://www.terathon.com/code/tangent.html
		// (per vertex tangents)

		if ( index === null ||
			 attributes.position === undefined ||
			 attributes.normal === undefined ||
			 attributes.uv === undefined ) {

			console.error( 'THREE.BufferGeometry: .computeTangents() failed. Missing required attributes (index, position, normal or uv)' );
			return;

		}

		const positionAttribute = attributes.position;
		const normalAttribute = attributes.normal;
		const uvAttribute = attributes.uv;

		if ( this.hasAttribute( 'tangent' ) === false ) {

			this.setAttribute( 'tangent', new BufferAttribute( new Float32Array( 4 * positionAttribute.count ), 4 ) );

		}

		const tangentAttribute = this.getAttribute( 'tangent' );

		const tan1 = [], tan2 = [];

		for ( let i = 0; i < positionAttribute.count; i ++ ) {

			tan1[ i ] = new Vector3();
			tan2[ i ] = new Vector3();

		}

		const vA = new Vector3(),
			vB = new Vector3(),
			vC = new Vector3(),

			uvA = new Vector2(),
			uvB = new Vector2(),
			uvC = new Vector2(),

			sdir = new Vector3(),
			tdir = new Vector3();

		function handleTriangle( a, b, c ) {

			vA.fromBufferAttribute( positionAttribute, a );
			vB.fromBufferAttribute( positionAttribute, b );
			vC.fromBufferAttribute( positionAttribute, c );

			uvA.fromBufferAttribute( uvAttribute, a );
			uvB.fromBufferAttribute( uvAttribute, b );
			uvC.fromBufferAttribute( uvAttribute, c );

			vB.sub( vA );
			vC.sub( vA );

			uvB.sub( uvA );
			uvC.sub( uvA );

			const r = 1.0 / ( uvB.x * uvC.y - uvC.x * uvB.y );

			// silently ignore degenerate uv triangles having coincident or colinear vertices

			if ( ! isFinite( r ) ) return;

			sdir.copy( vB ).multiplyScalar( uvC.y ).addScaledVector( vC, - uvB.y ).multiplyScalar( r );
			tdir.copy( vC ).multiplyScalar( uvB.x ).addScaledVector( vB, - uvC.x ).multiplyScalar( r );

			tan1[ a ].add( sdir );
			tan1[ b ].add( sdir );
			tan1[ c ].add( sdir );

			tan2[ a ].add( tdir );
			tan2[ b ].add( tdir );
			tan2[ c ].add( tdir );

		}

		let groups = this.groups;

		if ( groups.length === 0 ) {

			groups = [ {
				start: 0,
				count: index.count
			} ];

		}

		for ( let i = 0, il = groups.length; i < il; ++ i ) {

			const group = groups[ i ];

			const start = group.start;
			const count = group.count;

			for ( let j = start, jl = start + count; j < jl; j += 3 ) {

				handleTriangle(
					index.getX( j + 0 ),
					index.getX( j + 1 ),
					index.getX( j + 2 )
				);

			}

		}

		const tmp = new Vector3(), tmp2 = new Vector3();
		const n = new Vector3(), n2 = new Vector3();

		function handleVertex( v ) {

			n.fromBufferAttribute( normalAttribute, v );
			n2.copy( n );

			const t = tan1[ v ];

			// Gram-Schmidt orthogonalize

			tmp.copy( t );
			tmp.sub( n.multiplyScalar( n.dot( t ) ) ).normalize();

			// Calculate handedness

			tmp2.crossVectors( n2, t );
			const test = tmp2.dot( tan2[ v ] );
			const w = ( test < 0.0 ) ? - 1.0 : 1.0;

			tangentAttribute.setXYZW( v, tmp.x, tmp.y, tmp.z, w );

		}

		for ( let i = 0, il = groups.length; i < il; ++ i ) {

			const group = groups[ i ];

			const start = group.start;
			const count = group.count;

			for ( let j = start, jl = start + count; j < jl; j += 3 ) {

				handleVertex( index.getX( j + 0 ) );
				handleVertex( index.getX( j + 1 ) );
				handleVertex( index.getX( j + 2 ) );

			}

		}

	}

	computeVertexNormals() {

		const index = this.index;
		const positionAttribute = this.getAttribute( 'position' );

		if ( positionAttribute !== undefined ) {

			let normalAttribute = this.getAttribute( 'normal' );

			if ( normalAttribute === undefined ) {

				normalAttribute = new BufferAttribute( new Float32Array( positionAttribute.count * 3 ), 3 );
				this.setAttribute( 'normal', normalAttribute );

			} else {

				// reset existing normals to zero

				for ( let i = 0, il = normalAttribute.count; i < il; i ++ ) {

					normalAttribute.setXYZ( i, 0, 0, 0 );

				}

			}

			const pA = new Vector3(), pB = new Vector3(), pC = new Vector3();
			const nA = new Vector3(), nB = new Vector3(), nC = new Vector3();
			const cb = new Vector3(), ab = new Vector3();

			// indexed elements

			if ( index ) {

				for ( let i = 0, il = index.count; i < il; i += 3 ) {

					const vA = index.getX( i + 0 );
					const vB = index.getX( i + 1 );
					const vC = index.getX( i + 2 );

					pA.fromBufferAttribute( positionAttribute, vA );
					pB.fromBufferAttribute( positionAttribute, vB );
					pC.fromBufferAttribute( positionAttribute, vC );

					cb.subVectors( pC, pB );
					ab.subVectors( pA, pB );
					cb.cross( ab );

					nA.fromBufferAttribute( normalAttribute, vA );
					nB.fromBufferAttribute( normalAttribute, vB );
					nC.fromBufferAttribute( normalAttribute, vC );

					nA.add( cb );
					nB.add( cb );
					nC.add( cb );

					normalAttribute.setXYZ( vA, nA.x, nA.y, nA.z );
					normalAttribute.setXYZ( vB, nB.x, nB.y, nB.z );
					normalAttribute.setXYZ( vC, nC.x, nC.y, nC.z );

				}

			} else {

				// non-indexed elements (unconnected triangle soup)

				for ( let i = 0, il = positionAttribute.count; i < il; i += 3 ) {

					pA.fromBufferAttribute( positionAttribute, i + 0 );
					pB.fromBufferAttribute( positionAttribute, i + 1 );
					pC.fromBufferAttribute( positionAttribute, i + 2 );

					cb.subVectors( pC, pB );
					ab.subVectors( pA, pB );
					cb.cross( ab );

					normalAttribute.setXYZ( i + 0, cb.x, cb.y, cb.z );
					normalAttribute.setXYZ( i + 1, cb.x, cb.y, cb.z );
					normalAttribute.setXYZ( i + 2, cb.x, cb.y, cb.z );

				}

			}

			this.normalizeNormals();

			normalAttribute.needsUpdate = true;

		}

	}

	normalizeNormals() {

		const normals = this.attributes.normal;

		for ( let i = 0, il = normals.count; i < il; i ++ ) {

			_vector$8.fromBufferAttribute( normals, i );

			_vector$8.normalize();

			normals.setXYZ( i, _vector$8.x, _vector$8.y, _vector$8.z );

		}

	}

	toNonIndexed() {

		function convertBufferAttribute( attribute, indices ) {

			const array = attribute.array;
			const itemSize = attribute.itemSize;
			const normalized = attribute.normalized;

			const array2 = new array.constructor( indices.length * itemSize );

			let index = 0, index2 = 0;

			for ( let i = 0, l = indices.length; i < l; i ++ ) {

				if ( attribute.isInterleavedBufferAttribute ) {

					index = indices[ i ] * attribute.data.stride + attribute.offset;

				} else {

					index = indices[ i ] * itemSize;

				}

				for ( let j = 0; j < itemSize; j ++ ) {

					array2[ index2 ++ ] = array[ index ++ ];

				}

			}

			return new BufferAttribute( array2, itemSize, normalized );

		}

		//

		if ( this.index === null ) {

			console.warn( 'THREE.BufferGeometry.toNonIndexed(): BufferGeometry is already non-indexed.' );
			return this;

		}

		const geometry2 = new BufferGeometry();

		const indices = this.index.array;
		const attributes = this.attributes;

		// attributes

		for ( const name in attributes ) {

			const attribute = attributes[ name ];

			const newAttribute = convertBufferAttribute( attribute, indices );

			geometry2.setAttribute( name, newAttribute );

		}

		// morph attributes

		const morphAttributes = this.morphAttributes;

		for ( const name in morphAttributes ) {

			const morphArray = [];
			const morphAttribute = morphAttributes[ name ]; // morphAttribute: array of Float32BufferAttributes

			for ( let i = 0, il = morphAttribute.length; i < il; i ++ ) {

				const attribute = morphAttribute[ i ];

				const newAttribute = convertBufferAttribute( attribute, indices );

				morphArray.push( newAttribute );

			}

			geometry2.morphAttributes[ name ] = morphArray;

		}

		geometry2.morphTargetsRelative = this.morphTargetsRelative;

		// groups

		const groups = this.groups;

		for ( let i = 0, l = groups.length; i < l; i ++ ) {

			const group = groups[ i ];
			geometry2.addGroup( group.start, group.count, group.materialIndex );

		}

		return geometry2;

	}

	toJSON() {

		const data = {
			metadata: {
				version: 4.6,
				type: 'BufferGeometry',
				generator: 'BufferGeometry.toJSON'
			}
		};

		// standard BufferGeometry serialization

		data.uuid = this.uuid;
		data.type = this.type;
		if ( this.name !== '' ) data.name = this.name;
		if ( Object.keys( this.userData ).length > 0 ) data.userData = this.userData;

		if ( this.parameters !== undefined ) {

			const parameters = this.parameters;

			for ( const key in parameters ) {

				if ( parameters[ key ] !== undefined ) data[ key ] = parameters[ key ];

			}

			return data;

		}

		// for simplicity the code assumes attributes are not shared across geometries, see #15811

		data.data = { attributes: {} };

		const index = this.index;

		if ( index !== null ) {

			data.data.index = {
				type: index.array.constructor.name,
				array: Array.prototype.slice.call( index.array )
			};

		}

		const attributes = this.attributes;

		for ( const key in attributes ) {

			const attribute = attributes[ key ];

			data.data.attributes[ key ] = attribute.toJSON( data.data );

		}

		const morphAttributes = {};
		let hasMorphAttributes = false;

		for ( const key in this.morphAttributes ) {

			const attributeArray = this.morphAttributes[ key ];

			const array = [];

			for ( let i = 0, il = attributeArray.length; i < il; i ++ ) {

				const attribute = attributeArray[ i ];

				array.push( attribute.toJSON( data.data ) );

			}

			if ( array.length > 0 ) {

				morphAttributes[ key ] = array;

				hasMorphAttributes = true;

			}

		}

		if ( hasMorphAttributes ) {

			data.data.morphAttributes = morphAttributes;
			data.data.morphTargetsRelative = this.morphTargetsRelative;

		}

		const groups = this.groups;

		if ( groups.length > 0 ) {

			data.data.groups = JSON.parse( JSON.stringify( groups ) );

		}

		const boundingSphere = this.boundingSphere;

		if ( boundingSphere !== null ) {

			data.data.boundingSphere = {
				center: boundingSphere.center.toArray(),
				radius: boundingSphere.radius
			};

		}

		return data;

	}

	clone() {

		return new this.constructor().copy( this );

	}

	copy( source ) {

		// reset

		this.index = null;
		this.attributes = {};
		this.morphAttributes = {};
		this.groups = [];
		this.boundingBox = null;
		this.boundingSphere = null;

		// used for storing cloned, shared data

		const data = {};

		// name

		this.name = source.name;

		// index

		const index = source.index;

		if ( index !== null ) {

			this.setIndex( index.clone( data ) );

		}

		// attributes

		const attributes = source.attributes;

		for ( const name in attributes ) {

			const attribute = attributes[ name ];
			this.setAttribute( name, attribute.clone( data ) );

		}

		// morph attributes

		const morphAttributes = source.morphAttributes;

		for ( const name in morphAttributes ) {

			const array = [];
			const morphAttribute = morphAttributes[ name ]; // morphAttribute: array of Float32BufferAttributes

			for ( let i = 0, l = morphAttribute.length; i < l; i ++ ) {

				array.push( morphAttribute[ i ].clone( data ) );

			}

			this.morphAttributes[ name ] = array;

		}

		this.morphTargetsRelative = source.morphTargetsRelative;

		// groups

		const groups = source.groups;

		for ( let i = 0, l = groups.length; i < l; i ++ ) {

			const group = groups[ i ];
			this.addGroup( group.start, group.count, group.materialIndex );

		}

		// bounding box

		const boundingBox = source.boundingBox;

		if ( boundingBox !== null ) {

			this.boundingBox = boundingBox.clone();

		}

		// bounding sphere

		const boundingSphere = source.boundingSphere;

		if ( boundingSphere !== null ) {

			this.boundingSphere = boundingSphere.clone();

		}

		// draw range

		this.drawRange.start = source.drawRange.start;
		this.drawRange.count = source.drawRange.count;

		// user data

		this.userData = source.userData;

		return this;

	}

	dispose() {

		this.dispatchEvent( { type: 'dispose' } );

	}

}

const _inverseMatrix$3 = /*@__PURE__*/ new Matrix4();
const _ray$3 = /*@__PURE__*/ new Ray();
const _sphere$6 = /*@__PURE__*/ new Sphere();
const _sphereHitAt = /*@__PURE__*/ new Vector3();

const _vA$1 = /*@__PURE__*/ new Vector3();
const _vB$1 = /*@__PURE__*/ new Vector3();
const _vC$1 = /*@__PURE__*/ new Vector3();

const _tempA = /*@__PURE__*/ new Vector3();
const _morphA = /*@__PURE__*/ new Vector3();

const _uvA$1 = /*@__PURE__*/ new Vector2();
const _uvB$1 = /*@__PURE__*/ new Vector2();
const _uvC$1 = /*@__PURE__*/ new Vector2();

const _normalA = /*@__PURE__*/ new Vector3();
const _normalB = /*@__PURE__*/ new Vector3();
const _normalC = /*@__PURE__*/ new Vector3();

const _intersectionPoint = /*@__PURE__*/ new Vector3();
const _intersectionPointWorld = /*@__PURE__*/ new Vector3();

class Mesh extends Object3D {

	constructor( geometry = new BufferGeometry(), material = new MeshBasicMaterial() ) {

		super();

		this.isMesh = true;

		this.type = 'Mesh';

		this.geometry = geometry;
		this.material = material;

		this.updateMorphTargets();

	}

	copy( source, recursive ) {

		super.copy( source, recursive );

		if ( source.morphTargetInfluences !== undefined ) {

			this.morphTargetInfluences = source.morphTargetInfluences.slice();

		}

		if ( source.morphTargetDictionary !== undefined ) {

			this.morphTargetDictionary = Object.assign( {}, source.morphTargetDictionary );

		}

		this.material = Array.isArray( source.material ) ? source.material.slice() : source.material;
		this.geometry = source.geometry;

		return this;

	}

	updateMorphTargets() {

		const geometry = this.geometry;

		const morphAttributes = geometry.morphAttributes;
		const keys = Object.keys( morphAttributes );

		if ( keys.length > 0 ) {

			const morphAttribute = morphAttributes[ keys[ 0 ] ];

			if ( morphAttribute !== undefined ) {

				this.morphTargetInfluences = [];
				this.morphTargetDictionary = {};

				for ( let m = 0, ml = morphAttribute.length; m < ml; m ++ ) {

					const name = morphAttribute[ m ].name || String( m );

					this.morphTargetInfluences.push( 0 );
					this.morphTargetDictionary[ name ] = m;

				}

			}

		}

	}

	getVertexPosition( index, target ) {

		const geometry = this.geometry;
		const position = geometry.attributes.position;
		const morphPosition = geometry.morphAttributes.position;
		const morphTargetsRelative = geometry.morphTargetsRelative;

		target.fromBufferAttribute( position, index );

		const morphInfluences = this.morphTargetInfluences;

		if ( morphPosition && morphInfluences ) {

			_morphA.set( 0, 0, 0 );

			for ( let i = 0, il = morphPosition.length; i < il; i ++ ) {

				const influence = morphInfluences[ i ];
				const morphAttribute = morphPosition[ i ];

				if ( influence === 0 ) continue;

				_tempA.fromBufferAttribute( morphAttribute, index );

				if ( morphTargetsRelative ) {

					_morphA.addScaledVector( _tempA, influence );

				} else {

					_morphA.addScaledVector( _tempA.sub( target ), influence );

				}

			}

			target.add( _morphA );

		}

		return target;

	}

	raycast( raycaster, intersects ) {

		const geometry = this.geometry;
		const material = this.material;
		const matrixWorld = this.matrixWorld;

		if ( material === undefined ) return;

		// test with bounding sphere in world space

		if ( geometry.boundingSphere === null ) geometry.computeBoundingSphere();

		_sphere$6.copy( geometry.boundingSphere );
		_sphere$6.applyMatrix4( matrixWorld );

		// check distance from ray origin to bounding sphere

		_ray$3.copy( raycaster.ray ).recast( raycaster.near );

		if ( _sphere$6.containsPoint( _ray$3.origin ) === false ) {

			if ( _ray$3.intersectSphere( _sphere$6, _sphereHitAt ) === null ) return;

			if ( _ray$3.origin.distanceToSquared( _sphereHitAt ) > ( raycaster.far - raycaster.near ) ** 2 ) return;

		}

		// convert ray to local space of mesh

		_inverseMatrix$3.copy( matrixWorld ).invert();
		_ray$3.copy( raycaster.ray ).applyMatrix4( _inverseMatrix$3 );

		// test with bounding box in local space

		if ( geometry.boundingBox !== null ) {

			if ( _ray$3.intersectsBox( geometry.boundingBox ) === false ) return;

		}

		// test for intersections with geometry

		this._computeIntersections( raycaster, intersects, _ray$3 );

	}

	_computeIntersections( raycaster, intersects, rayLocalSpace ) {

		let intersection;

		const geometry = this.geometry;
		const material = this.material;

		const index = geometry.index;
		const position = geometry.attributes.position;
		const uv = geometry.attributes.uv;
		const uv1 = geometry.attributes.uv1;
		const normal = geometry.attributes.normal;
		const groups = geometry.groups;
		const drawRange = geometry.drawRange;

		if ( index !== null ) {

			// indexed buffer geometry

			if ( Array.isArray( material ) ) {

				for ( let i = 0, il = groups.length; i < il; i ++ ) {

					const group = groups[ i ];
					const groupMaterial = material[ group.materialIndex ];

					const start = Math.max( group.start, drawRange.start );
					const end = Math.min( index.count, Math.min( ( group.start + group.count ), ( drawRange.start + drawRange.count ) ) );

					for ( let j = start, jl = end; j < jl; j += 3 ) {

						const a = index.getX( j );
						const b = index.getX( j + 1 );
						const c = index.getX( j + 2 );

						intersection = checkGeometryIntersection( this, groupMaterial, raycaster, rayLocalSpace, uv, uv1, normal, a, b, c );

						if ( intersection ) {

							intersection.faceIndex = Math.floor( j / 3 ); // triangle number in indexed buffer semantics
							intersection.face.materialIndex = group.materialIndex;
							intersects.push( intersection );

						}

					}

				}

			} else {

				const start = Math.max( 0, drawRange.start );
				const end = Math.min( index.count, ( drawRange.start + drawRange.count ) );

				for ( let i = start, il = end; i < il; i += 3 ) {

					const a = index.getX( i );
					const b = index.getX( i + 1 );
					const c = index.getX( i + 2 );

					intersection = checkGeometryIntersection( this, material, raycaster, rayLocalSpace, uv, uv1, normal, a, b, c );

					if ( intersection ) {

						intersection.faceIndex = Math.floor( i / 3 ); // triangle number in indexed buffer semantics
						intersects.push( intersection );

					}

				}

			}

		} else if ( position !== undefined ) {

			// non-indexed buffer geometry

			if ( Array.isArray( material ) ) {

				for ( let i = 0, il = groups.length; i < il; i ++ ) {

					const group = groups[ i ];
					const groupMaterial = material[ group.materialIndex ];

					const start = Math.max( group.start, drawRange.start );
					const end = Math.min( position.count, Math.min( ( group.start + group.count ), ( drawRange.start + drawRange.count ) ) );

					for ( let j = start, jl = end; j < jl; j += 3 ) {

						const a = j;
						const b = j + 1;
						const c = j + 2;

						intersection = checkGeometryIntersection( this, groupMaterial, raycaster, rayLocalSpace, uv, uv1, normal, a, b, c );

						if ( intersection ) {

							intersection.faceIndex = Math.floor( j / 3 ); // triangle number in non-indexed buffer semantics
							intersection.face.materialIndex = group.materialIndex;
							intersects.push( intersection );

						}

					}

				}

			} else {

				const start = Math.max( 0, drawRange.start );
				const end = Math.min( position.count, ( drawRange.start + drawRange.count ) );

				for ( let i = start, il = end; i < il; i += 3 ) {

					const a = i;
					const b = i + 1;
					const c = i + 2;

					intersection = checkGeometryIntersection( this, material, raycaster, rayLocalSpace, uv, uv1, normal, a, b, c );

					if ( intersection ) {

						intersection.faceIndex = Math.floor( i / 3 ); // triangle number in non-indexed buffer semantics
						intersects.push( intersection );

					}

				}

			}

		}

	}

}

function checkIntersection$1( object, material, raycaster, ray, pA, pB, pC, point ) {

	let intersect;

	if ( material.side === BackSide ) {

		intersect = ray.intersectTriangle( pC, pB, pA, true, point );

	} else {

		intersect = ray.intersectTriangle( pA, pB, pC, ( material.side === FrontSide ), point );

	}

	if ( intersect === null ) return null;

	_intersectionPointWorld.copy( point );
	_intersectionPointWorld.applyMatrix4( object.matrixWorld );

	const distance = raycaster.ray.origin.distanceTo( _intersectionPointWorld );

	if ( distance < raycaster.near || distance > raycaster.far ) return null;

	return {
		distance: distance,
		point: _intersectionPointWorld.clone(),
		object: object
	};

}

function checkGeometryIntersection( object, material, raycaster, ray, uv, uv1, normal, a, b, c ) {

	object.getVertexPosition( a, _vA$1 );
	object.getVertexPosition( b, _vB$1 );
	object.getVertexPosition( c, _vC$1 );

	const intersection = checkIntersection$1( object, material, raycaster, ray, _vA$1, _vB$1, _vC$1, _intersectionPoint );

	if ( intersection ) {

		if ( uv ) {

			_uvA$1.fromBufferAttribute( uv, a );
			_uvB$1.fromBufferAttribute( uv, b );
			_uvC$1.fromBufferAttribute( uv, c );

			intersection.uv = Triangle.getInterpolation( _intersectionPoint, _vA$1, _vB$1, _vC$1, _uvA$1, _uvB$1, _uvC$1, new Vector2() );

		}

		if ( uv1 ) {

			_uvA$1.fromBufferAttribute( uv1, a );
			_uvB$1.fromBufferAttribute( uv1, b );
			_uvC$1.fromBufferAttribute( uv1, c );

			intersection.uv1 = Triangle.getInterpolation( _intersectionPoint, _vA$1, _vB$1, _vC$1, _uvA$1, _uvB$1, _uvC$1, new Vector2() );

		}

		if ( normal ) {

			_normalA.fromBufferAttribute( normal, a );
			_normalB.fromBufferAttribute( normal, b );
			_normalC.fromBufferAttribute( normal, c );

			intersection.normal = Triangle.getInterpolation( _intersectionPoint, _vA$1, _vB$1, _vC$1, _normalA, _normalB, _normalC, new Vector3() );

			if ( intersection.normal.dot( ray.direction ) > 0 ) {

				intersection.normal.multiplyScalar( - 1 );

			}

		}

		const face = {
			a: a,
			b: b,
			c: c,
			normal: new Vector3(),
			materialIndex: 0
		};

		Triangle.getNormal( _vA$1, _vB$1, _vC$1, face.normal );

		intersection.face = face;

	}

	return intersection;

}

class BoxGeometry extends BufferGeometry {

	constructor( width = 1, height = 1, depth = 1, widthSegments = 1, heightSegments = 1, depthSegments = 1 ) {

		super();

		this.type = 'BoxGeometry';

		this.parameters = {
			width: width,
			height: height,
			depth: depth,
			widthSegments: widthSegments,
			heightSegments: heightSegments,
			depthSegments: depthSegments
		};

		const scope = this;

		// segments

		widthSegments = Math.floor( widthSegments );
		heightSegments = Math.floor( heightSegments );
		depthSegments = Math.floor( depthSegments );

		// buffers

		const indices = [];
		const vertices = [];
		const normals = [];
		const uvs = [];

		// helper variables

		let numberOfVertices = 0;
		let groupStart = 0;

		// build each side of the box geometry

		buildPlane( 'z', 'y', 'x', - 1, - 1, depth, height, width, depthSegments, heightSegments, 0 ); // px
		buildPlane( 'z', 'y', 'x', 1, - 1, depth, height, - width, depthSegments, heightSegments, 1 ); // nx
		buildPlane( 'x', 'z', 'y', 1, 1, width, depth, height, widthSegments, depthSegments, 2 ); // py
		buildPlane( 'x', 'z', 'y', 1, - 1, width, depth, - height, widthSegments, depthSegments, 3 ); // ny
		buildPlane( 'x', 'y', 'z', 1, - 1, width, height, depth, widthSegments, heightSegments, 4 ); // pz
		buildPlane( 'x', 'y', 'z', - 1, - 1, width, height, - depth, widthSegments, heightSegments, 5 ); // nz

		// build geometry

		this.setIndex( indices );
		this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
		this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );
		this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );

		function buildPlane( u, v, w, udir, vdir, width, height, depth, gridX, gridY, materialIndex ) {

			const segmentWidth = width / gridX;
			const segmentHeight = height / gridY;

			const widthHalf = width / 2;
			const heightHalf = height / 2;
			const depthHalf = depth / 2;

			const gridX1 = gridX + 1;
			const gridY1 = gridY + 1;

			let vertexCounter = 0;
			let groupCount = 0;

			const vector = new Vector3();

			// generate vertices, normals and uvs

			for ( let iy = 0; iy < gridY1; iy ++ ) {

				const y = iy * segmentHeight - heightHalf;

				for ( let ix = 0; ix < gridX1; ix ++ ) {

					const x = ix * segmentWidth - widthHalf;

					// set values to correct vector component

					vector[ u ] = x * udir;
					vector[ v ] = y * vdir;
					vector[ w ] = depthHalf;

					// now apply vector to vertex buffer

					vertices.push( vector.x, vector.y, vector.z );

					// set values to correct vector component

					vector[ u ] = 0;
					vector[ v ] = 0;
					vector[ w ] = depth > 0 ? 1 : - 1;

					// now apply vector to normal buffer

					normals.push( vector.x, vector.y, vector.z );

					// uvs

					uvs.push( ix / gridX );
					uvs.push( 1 - ( iy / gridY ) );

					// counters

					vertexCounter += 1;

				}

			}

			// indices

			// 1. you need three indices to draw a single face
			// 2. a single segment consists of two faces
			// 3. so we need to generate six (2*3) indices per segment

			for ( let iy = 0; iy < gridY; iy ++ ) {

				for ( let ix = 0; ix < gridX; ix ++ ) {

					const a = numberOfVertices + ix + gridX1 * iy;
					const b = numberOfVertices + ix + gridX1 * ( iy + 1 );
					const c = numberOfVertices + ( ix + 1 ) + gridX1 * ( iy + 1 );
					const d = numberOfVertices + ( ix + 1 ) + gridX1 * iy;

					// faces

					indices.push( a, b, d );
					indices.push( b, c, d );

					// increase counter

					groupCount += 6;

				}

			}

			// add a group to the geometry. this will ensure multi material support

			scope.addGroup( groupStart, groupCount, materialIndex );

			// calculate new start value for groups

			groupStart += groupCount;

			// update total number of vertices

			numberOfVertices += vertexCounter;

		}

	}

	copy( source ) {

		super.copy( source );

		this.parameters = Object.assign( {}, source.parameters );

		return this;

	}

	static fromJSON( data ) {

		return new BoxGeometry( data.width, data.height, data.depth, data.widthSegments, data.heightSegments, data.depthSegments );

	}

}

/**
 * Uniform Utilities
 */

function cloneUniforms( src ) {

	const dst = {};

	for ( const u in src ) {

		dst[ u ] = {};

		for ( const p in src[ u ] ) {

			const property = src[ u ][ p ];

			if ( property && ( property.isColor ||
				property.isMatrix3 || property.isMatrix4 ||
				property.isVector2 || property.isVector3 || property.isVector4 ||
				property.isTexture || property.isQuaternion ) ) {

				if ( property.isRenderTargetTexture ) {

					console.warn( 'UniformsUtils: Textures of render targets cannot be cloned via cloneUniforms() or mergeUniforms().' );
					dst[ u ][ p ] = null;

				} else {

					dst[ u ][ p ] = property.clone();

				}

			} else if ( Array.isArray( property ) ) {

				dst[ u ][ p ] = property.slice();

			} else {

				dst[ u ][ p ] = property;

			}

		}

	}

	return dst;

}

function cloneUniformsGroups( src ) {

	const dst = [];

	for ( let u = 0; u < src.length; u ++ ) {

		dst.push( src[ u ].clone() );

	}

	return dst;

}

var default_vertex = /* glsl */`
void main() {
	gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
}
`;

var default_fragment = /* glsl */`
void main() {
	gl_FragColor = vec4( 1.0, 0.0, 0.0, 1.0 );
}
`;

class ShaderMaterial extends Material {

	constructor( parameters ) {

		super();

		this.isShaderMaterial = true;

		this.type = 'ShaderMaterial';

		this.defines = {};
		this.uniforms = {};
		this.uniformsGroups = [];

		this.vertexShader = default_vertex;
		this.fragmentShader = default_fragment;

		this.linewidth = 1;

		this.wireframe = false;
		this.wireframeLinewidth = 1;

		this.fog = false; // set to use scene fog
		this.lights = false; // set to use scene lights
		this.clipping = false; // set to use user-defined clipping planes

		this.forceSinglePass = true;

		this.extensions = {
			clipCullDistance: false, // set to use vertex shader clipping
			multiDraw: false // set to use vertex shader multi_draw / enable gl_DrawID
		};

		// When rendered geometry doesn't include these attributes but the material does,
		// use these default values in WebGL. This avoids errors when buffer data is missing.
		this.defaultAttributeValues = {
			'color': [ 1, 1, 1 ],
			'uv': [ 0, 0 ],
			'uv1': [ 0, 0 ]
		};

		this.index0AttributeName = undefined;
		this.uniformsNeedUpdate = false;

		this.glslVersion = null;

		if ( parameters !== undefined ) {

			this.setValues( parameters );

		}

	}

	copy( source ) {

		super.copy( source );

		this.fragmentShader = source.fragmentShader;
		this.vertexShader = source.vertexShader;

		this.uniforms = cloneUniforms( source.uniforms );
		this.uniformsGroups = cloneUniformsGroups( source.uniformsGroups );

		this.defines = Object.assign( {}, source.defines );

		this.wireframe = source.wireframe;
		this.wireframeLinewidth = source.wireframeLinewidth;

		this.fog = source.fog;
		this.lights = source.lights;
		this.clipping = source.clipping;

		this.extensions = Object.assign( {}, source.extensions );

		this.glslVersion = source.glslVersion;

		return this;

	}

	toJSON( meta ) {

		const data = super.toJSON( meta );

		data.glslVersion = this.glslVersion;
		data.uniforms = {};

		for ( const name in this.uniforms ) {

			const uniform = this.uniforms[ name ];
			const value = uniform.value;

			if ( value && value.isTexture ) {

				data.uniforms[ name ] = {
					type: 't',
					value: value.toJSON( meta ).uuid
				};

			} else if ( value && value.isColor ) {

				data.uniforms[ name ] = {
					type: 'c',
					value: value.getHex()
				};

			} else if ( value && value.isVector2 ) {

				data.uniforms[ name ] = {
					type: 'v2',
					value: value.toArray()
				};

			} else if ( value && value.isVector3 ) {

				data.uniforms[ name ] = {
					type: 'v3',
					value: value.toArray()
				};

			} else if ( value && value.isVector4 ) {

				data.uniforms[ name ] = {
					type: 'v4',
					value: value.toArray()
				};

			} else if ( value && value.isMatrix3 ) {

				data.uniforms[ name ] = {
					type: 'm3',
					value: value.toArray()
				};

			} else if ( value && value.isMatrix4 ) {

				data.uniforms[ name ] = {
					type: 'm4',
					value: value.toArray()
				};

			} else {

				data.uniforms[ name ] = {
					value: value
				};

				// note: the array variants v2v, v3v, v4v, m4v and tv are not supported so far

			}

		}

		if ( Object.keys( this.defines ).length > 0 ) data.defines = this.defines;

		data.vertexShader = this.vertexShader;
		data.fragmentShader = this.fragmentShader;

		data.lights = this.lights;
		data.clipping = this.clipping;

		const extensions = {};

		for ( const key in this.extensions ) {

			if ( this.extensions[ key ] === true ) extensions[ key ] = true;

		}

		if ( Object.keys( extensions ).length > 0 ) data.extensions = extensions;

		return data;

	}

}

class Camera extends Object3D {

	constructor() {

		super();

		this.isCamera = true;

		this.type = 'Camera';

		this.matrixWorldInverse = new Matrix4();

		this.projectionMatrix = new Matrix4();
		this.projectionMatrixInverse = new Matrix4();

		this.coordinateSystem = WebGLCoordinateSystem;

	}

	copy( source, recursive ) {

		super.copy( source, recursive );

		this.matrixWorldInverse.copy( source.matrixWorldInverse );

		this.projectionMatrix.copy( source.projectionMatrix );
		this.projectionMatrixInverse.copy( source.projectionMatrixInverse );

		this.coordinateSystem = source.coordinateSystem;

		return this;

	}

	getWorldDirection( target ) {

		return super.getWorldDirection( target ).negate();

	}

	updateMatrixWorld( force ) {

		super.updateMatrixWorld( force );

		this.matrixWorldInverse.copy( this.matrixWorld ).invert();

	}

	updateWorldMatrix( updateParents, updateChildren ) {

		super.updateWorldMatrix( updateParents, updateChildren );

		this.matrixWorldInverse.copy( this.matrixWorld ).invert();

	}

	clone() {

		return new this.constructor().copy( this );

	}

}

const _v3$1 = /*@__PURE__*/ new Vector3();
const _minTarget = /*@__PURE__*/ new Vector2();
const _maxTarget = /*@__PURE__*/ new Vector2();


class PerspectiveCamera extends Camera {

	constructor( fov = 50, aspect = 1, near = 0.1, far = 2000 ) {

		super();

		this.isPerspectiveCamera = true;

		this.type = 'PerspectiveCamera';

		this.fov = fov;
		this.zoom = 1;

		this.near = near;
		this.far = far;
		this.focus = 10;

		this.aspect = aspect;
		this.view = null;

		this.filmGauge = 35;	// width of the film (default in millimeters)
		this.filmOffset = 0;	// horizontal film offset (same unit as gauge)

		this.updateProjectionMatrix();

	}

	copy( source, recursive ) {

		super.copy( source, recursive );

		this.fov = source.fov;
		this.zoom = source.zoom;

		this.near = source.near;
		this.far = source.far;
		this.focus = source.focus;

		this.aspect = source.aspect;
		this.view = source.view === null ? null : Object.assign( {}, source.view );

		this.filmGauge = source.filmGauge;
		this.filmOffset = source.filmOffset;

		return this;

	}

	/**
	 * Sets the FOV by focal length in respect to the current .filmGauge.
	 *
	 * The default film gauge is 35, so that the focal length can be specified for
	 * a 35mm (full frame) camera.
	 *
	 * Values for focal length and film gauge must have the same unit.
	 */
	setFocalLength( focalLength ) {

		/** see {@link http://www.bobatkins.com/photography/technical/field_of_view.html} */
		const vExtentSlope = 0.5 * this.getFilmHeight() / focalLength;

		this.fov = RAD2DEG * 2 * Math.atan( vExtentSlope );
		this.updateProjectionMatrix();

	}

	/**
	 * Calculates the focal length from the current .fov and .filmGauge.
	 */
	getFocalLength() {

		const vExtentSlope = Math.tan( DEG2RAD * 0.5 * this.fov );

		return 0.5 * this.getFilmHeight() / vExtentSlope;

	}

	getEffectiveFOV() {

		return RAD2DEG * 2 * Math.atan(
			Math.tan( DEG2RAD * 0.5 * this.fov ) / this.zoom );

	}

	getFilmWidth() {

		// film not completely covered in portrait format (aspect < 1)
		return this.filmGauge * Math.min( this.aspect, 1 );

	}

	getFilmHeight() {

		// film not completely covered in landscape format (aspect > 1)
		return this.filmGauge / Math.max( this.aspect, 1 );

	}

	/**
	 * Computes the 2D bounds of the camera's viewable rectangle at a given distance along the viewing direction.
	 * Sets minTarget and maxTarget to the coordinates of the lower-left and upper-right corners of the view rectangle.
	 */
	getViewBounds( distance, minTarget, maxTarget ) {

		_v3$1.set( - 1, - 1, 0.5 ).applyMatrix4( this.projectionMatrixInverse );

		minTarget.set( _v3$1.x, _v3$1.y ).multiplyScalar( - distance / _v3$1.z );

		_v3$1.set( 1, 1, 0.5 ).applyMatrix4( this.projectionMatrixInverse );

		maxTarget.set( _v3$1.x, _v3$1.y ).multiplyScalar( - distance / _v3$1.z );

	}

	/**
	 * Computes the width and height of the camera's viewable rectangle at a given distance along the viewing direction.
	 * Copies the result into the target Vector2, where x is width and y is height.
	 */
	getViewSize( distance, target ) {

		this.getViewBounds( distance, _minTarget, _maxTarget );

		return target.subVectors( _maxTarget, _minTarget );

	}

	/**
	 * Sets an offset in a larger frustum. This is useful for multi-window or
	 * multi-monitor/multi-machine setups.
	 *
	 * For example, if you have 3x2 monitors and each monitor is 1920x1080 and
	 * the monitors are in grid like this
	 *
	 *   +---+---+---+
	 *   | A | B | C |
	 *   +---+---+---+
	 *   | D | E | F |
	 *   +---+---+---+
	 *
	 * then for each monitor you would call it like this
	 *
	 *   const w = 1920;
	 *   const h = 1080;
	 *   const fullWidth = w * 3;
	 *   const fullHeight = h * 2;
	 *
	 *   --A--
	 *   camera.setViewOffset( fullWidth, fullHeight, w * 0, h * 0, w, h );
	 *   --B--
	 *   camera.setViewOffset( fullWidth, fullHeight, w * 1, h * 0, w, h );
	 *   --C--
	 *   camera.setViewOffset( fullWidth, fullHeight, w * 2, h * 0, w, h );
	 *   --D--
	 *   camera.setViewOffset( fullWidth, fullHeight, w * 0, h * 1, w, h );
	 *   --E--
	 *   camera.setViewOffset( fullWidth, fullHeight, w * 1, h * 1, w, h );
	 *   --F--
	 *   camera.setViewOffset( fullWidth, fullHeight, w * 2, h * 1, w, h );
	 *
	 *   Note there is no reason monitors have to be the same size or in a grid.
	 */
	setViewOffset( fullWidth, fullHeight, x, y, width, height ) {

		this.aspect = fullWidth / fullHeight;

		if ( this.view === null ) {

			this.view = {
				enabled: true,
				fullWidth: 1,
				fullHeight: 1,
				offsetX: 0,
				offsetY: 0,
				width: 1,
				height: 1
			};

		}

		this.view.enabled = true;
		this.view.fullWidth = fullWidth;
		this.view.fullHeight = fullHeight;
		this.view.offsetX = x;
		this.view.offsetY = y;
		this.view.width = width;
		this.view.height = height;

		this.updateProjectionMatrix();

	}

	clearViewOffset() {

		if ( this.view !== null ) {

			this.view.enabled = false;

		}

		this.updateProjectionMatrix();

	}

	updateProjectionMatrix() {

		const near = this.near;
		let top = near * Math.tan( DEG2RAD * 0.5 * this.fov ) / this.zoom;
		let height = 2 * top;
		let width = this.aspect * height;
		let left = - 0.5 * width;
		const view = this.view;

		if ( this.view !== null && this.view.enabled ) {

			const fullWidth = view.fullWidth,
				fullHeight = view.fullHeight;

			left += view.offsetX * width / fullWidth;
			top -= view.offsetY * height / fullHeight;
			width *= view.width / fullWidth;
			height *= view.height / fullHeight;

		}

		const skew = this.filmOffset;
		if ( skew !== 0 ) left += near * skew / this.getFilmWidth();

		this.projectionMatrix.makePerspective( left, left + width, top, top - height, near, this.far, this.coordinateSystem );

		this.projectionMatrixInverse.copy( this.projectionMatrix ).invert();

	}

	toJSON( meta ) {

		const data = super.toJSON( meta );

		data.object.fov = this.fov;
		data.object.zoom = this.zoom;

		data.object.near = this.near;
		data.object.far = this.far;
		data.object.focus = this.focus;

		data.object.aspect = this.aspect;

		if ( this.view !== null ) data.object.view = Object.assign( {}, this.view );

		data.object.filmGauge = this.filmGauge;
		data.object.filmOffset = this.filmOffset;

		return data;

	}

}

const fov = - 90; // negative fov is not an error
const aspect = 1;

class CubeCamera extends Object3D {

	constructor( near, far, renderTarget ) {

		super();

		this.type = 'CubeCamera';

		this.renderTarget = renderTarget;
		this.coordinateSystem = null;
		this.activeMipmapLevel = 0;

		const cameraPX = new PerspectiveCamera( fov, aspect, near, far );
		cameraPX.layers = this.layers;
		this.add( cameraPX );

		const cameraNX = new PerspectiveCamera( fov, aspect, near, far );
		cameraNX.layers = this.layers;
		this.add( cameraNX );

		const cameraPY = new PerspectiveCamera( fov, aspect, near, far );
		cameraPY.layers = this.layers;
		this.add( cameraPY );

		const cameraNY = new PerspectiveCamera( fov, aspect, near, far );
		cameraNY.layers = this.layers;
		this.add( cameraNY );

		const cameraPZ = new PerspectiveCamera( fov, aspect, near, far );
		cameraPZ.layers = this.layers;
		this.add( cameraPZ );

		const cameraNZ = new PerspectiveCamera( fov, aspect, near, far );
		cameraNZ.layers = this.layers;
		this.add( cameraNZ );

	}

	updateCoordinateSystem() {

		const coordinateSystem = this.coordinateSystem;

		const cameras = this.children.concat();

		const [ cameraPX, cameraNX, cameraPY, cameraNY, cameraPZ, cameraNZ ] = cameras;

		for ( const camera of cameras ) this.remove( camera );

		if ( coordinateSystem === WebGLCoordinateSystem ) {

			cameraPX.up.set( 0, 1, 0 );
			cameraPX.lookAt( 1, 0, 0 );

			cameraNX.up.set( 0, 1, 0 );
			cameraNX.lookAt( - 1, 0, 0 );

			cameraPY.up.set( 0, 0, - 1 );
			cameraPY.lookAt( 0, 1, 0 );

			cameraNY.up.set( 0, 0, 1 );
			cameraNY.lookAt( 0, - 1, 0 );

			cameraPZ.up.set( 0, 1, 0 );
			cameraPZ.lookAt( 0, 0, 1 );

			cameraNZ.up.set( 0, 1, 0 );
			cameraNZ.lookAt( 0, 0, - 1 );

		} else if ( coordinateSystem === WebGPUCoordinateSystem ) {

			cameraPX.up.set( 0, - 1, 0 );
			cameraPX.lookAt( - 1, 0, 0 );

			cameraNX.up.set( 0, - 1, 0 );
			cameraNX.lookAt( 1, 0, 0 );

			cameraPY.up.set( 0, 0, 1 );
			cameraPY.lookAt( 0, 1, 0 );

			cameraNY.up.set( 0, 0, - 1 );
			cameraNY.lookAt( 0, - 1, 0 );

			cameraPZ.up.set( 0, - 1, 0 );
			cameraPZ.lookAt( 0, 0, 1 );

			cameraNZ.up.set( 0, - 1, 0 );
			cameraNZ.lookAt( 0, 0, - 1 );

		} else {

			throw new Error( 'THREE.CubeCamera.updateCoordinateSystem(): Invalid coordinate system: ' + coordinateSystem );

		}

		for ( const camera of cameras ) {

			this.add( camera );

			camera.updateMatrixWorld();

		}

	}

	update( renderer, scene ) {

		if ( this.parent === null ) this.updateMatrixWorld();

		const { renderTarget, activeMipmapLevel } = this;

		if ( this.coordinateSystem !== renderer.coordinateSystem ) {

			this.coordinateSystem = renderer.coordinateSystem;

			this.updateCoordinateSystem();

		}

		const [ cameraPX, cameraNX, cameraPY, cameraNY, cameraPZ, cameraNZ ] = this.children;

		const currentRenderTarget = renderer.getRenderTarget();
		const currentActiveCubeFace = renderer.getActiveCubeFace();
		const currentActiveMipmapLevel = renderer.getActiveMipmapLevel();

		const currentXrEnabled = renderer.xr.enabled;

		renderer.xr.enabled = false;

		const generateMipmaps = renderTarget.texture.generateMipmaps;

		renderTarget.texture.generateMipmaps = false;

		renderer.setRenderTarget( renderTarget, 0, activeMipmapLevel );
		renderer.render( scene, cameraPX );

		renderer.setRenderTarget( renderTarget, 1, activeMipmapLevel );
		renderer.render( scene, cameraNX );

		renderer.setRenderTarget( renderTarget, 2, activeMipmapLevel );
		renderer.render( scene, cameraPY );

		renderer.setRenderTarget( renderTarget, 3, activeMipmapLevel );
		renderer.render( scene, cameraNY );

		renderer.setRenderTarget( renderTarget, 4, activeMipmapLevel );
		renderer.render( scene, cameraPZ );

		// mipmaps are generated during the last call of render()
		// at this point, all sides of the cube render target are defined

		renderTarget.texture.generateMipmaps = generateMipmaps;

		renderer.setRenderTarget( renderTarget, 5, activeMipmapLevel );
		renderer.render( scene, cameraNZ );

		renderer.setRenderTarget( currentRenderTarget, currentActiveCubeFace, currentActiveMipmapLevel );

		renderer.xr.enabled = currentXrEnabled;

		renderTarget.texture.needsPMREMUpdate = true;

	}

}

class CubeTexture extends Texture {

	constructor( images, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy, colorSpace ) {

		images = images !== undefined ? images : [];
		mapping = mapping !== undefined ? mapping : CubeReflectionMapping;

		super( images, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy, colorSpace );

		this.isCubeTexture = true;

		this.flipY = false;

	}

	get images() {

		return this.image;

	}

	set images( value ) {

		this.image = value;

	}

}

class WebGLCubeRenderTarget extends WebGLRenderTarget {

	constructor( size = 1, options = {} ) {

		super( size, size, options );

		this.isWebGLCubeRenderTarget = true;

		const image = { width: size, height: size, depth: 1 };
		const images = [ image, image, image, image, image, image ];

		this.texture = new CubeTexture( images, options.mapping, options.wrapS, options.wrapT, options.magFilter, options.minFilter, options.format, options.type, options.anisotropy, options.colorSpace );

		// By convention -- likely based on the RenderMan spec from the 1990's -- cube maps are specified by WebGL (and three.js)
		// in a coordinate system in which positive-x is to the right when looking up the positive-z axis -- in other words,
		// in a left-handed coordinate system. By continuing this convention, preexisting cube maps continued to render correctly.

		// three.js uses a right-handed coordinate system. So environment maps used in three.js appear to have px and nx swapped
		// and the flag isRenderTargetTexture controls this conversion. The flip is not required when using WebGLCubeRenderTarget.texture
		// as a cube texture (this is detected when isRenderTargetTexture is set to true for cube textures).

		this.texture.isRenderTargetTexture = true;

		this.texture.generateMipmaps = options.generateMipmaps !== undefined ? options.generateMipmaps : false;
		this.texture.minFilter = options.minFilter !== undefined ? options.minFilter : LinearFilter;

	}

	fromEquirectangularTexture( renderer, texture ) {

		this.texture.type = texture.type;
		this.texture.colorSpace = texture.colorSpace;

		this.texture.generateMipmaps = texture.generateMipmaps;
		this.texture.minFilter = texture.minFilter;
		this.texture.magFilter = texture.magFilter;

		const shader = {

			uniforms: {
				tEquirect: { value: null },
			},

			vertexShader: /* glsl */`

				varying vec3 vWorldDirection;

				vec3 transformDirection( in vec3 dir, in mat4 matrix ) {

					return normalize( ( matrix * vec4( dir, 0.0 ) ).xyz );

				}

				void main() {

					vWorldDirection = transformDirection( position, modelMatrix );

					#include <begin_vertex>
					#include <project_vertex>

				}
			`,

			fragmentShader: /* glsl */`

				uniform sampler2D tEquirect;

				varying vec3 vWorldDirection;

				#include <common>

				void main() {

					vec3 direction = normalize( vWorldDirection );

					vec2 sampleUV = equirectUv( direction );

					gl_FragColor = texture2D( tEquirect, sampleUV );

				}
			`
		};

		const geometry = new BoxGeometry( 5, 5, 5 );

		const material = new ShaderMaterial( {

			name: 'CubemapFromEquirect',

			uniforms: cloneUniforms( shader.uniforms ),
			vertexShader: shader.vertexShader,
			fragmentShader: shader.fragmentShader,
			side: BackSide,
			blending: NoBlending

		} );

		material.uniforms.tEquirect.value = texture;

		const mesh = new Mesh( geometry, material );

		const currentMinFilter = texture.minFilter;

		// Avoid blurred poles
		if ( texture.minFilter === LinearMipmapLinearFilter ) texture.minFilter = LinearFilter;

		const camera = new CubeCamera( 1, 10, this );
		camera.update( renderer, mesh );

		texture.minFilter = currentMinFilter;

		mesh.geometry.dispose();
		mesh.material.dispose();

		return this;

	}

	clear( renderer, color, depth, stencil ) {

		const currentRenderTarget = renderer.getRenderTarget();

		for ( let i = 0; i < 6; i ++ ) {

			renderer.setRenderTarget( this, i );

			renderer.clear( color, depth, stencil );

		}

		renderer.setRenderTarget( currentRenderTarget );

	}

}

class FogExp2 {

	constructor( color, density = 0.00025 ) {

		this.isFogExp2 = true;

		this.name = '';

		this.color = new Color( color );
		this.density = density;

	}

	clone() {

		return new FogExp2( this.color, this.density );

	}

	toJSON( /* meta */ ) {

		return {
			type: 'FogExp2',
			name: this.name,
			color: this.color.getHex(),
			density: this.density
		};

	}

}

class Fog {

	constructor( color, near = 1, far = 1000 ) {

		this.isFog = true;

		this.name = '';

		this.color = new Color( color );

		this.near = near;
		this.far = far;

	}

	clone() {

		return new Fog( this.color, this.near, this.far );

	}

	toJSON( /* meta */ ) {

		return {
			type: 'Fog',
			name: this.name,
			color: this.color.getHex(),
			near: this.near,
			far: this.far
		};

	}

}

class Scene extends Object3D {

	constructor() {

		super();

		this.isScene = true;

		this.type = 'Scene';

		this.background = null;
		this.environment = null;
		this.fog = null;

		this.backgroundBlurriness = 0;
		this.backgroundIntensity = 1;
		this.backgroundRotation = new Euler();

		this.environmentIntensity = 1;
		this.environmentRotation = new Euler();

		this.overrideMaterial = null;

		if ( typeof __THREE_DEVTOOLS__ !== 'undefined' ) {

			__THREE_DEVTOOLS__.dispatchEvent( new CustomEvent( 'observe', { detail: this } ) );

		}

	}

	copy( source, recursive ) {

		super.copy( source, recursive );

		if ( source.background !== null ) this.background = source.background.clone();
		if ( source.environment !== null ) this.environment = source.environment.clone();
		if ( source.fog !== null ) this.fog = source.fog.clone();

		this.backgroundBlurriness = source.backgroundBlurriness;
		this.backgroundIntensity = source.backgroundIntensity;
		this.backgroundRotation.copy( source.backgroundRotation );

		this.environmentIntensity = source.environmentIntensity;
		this.environmentRotation.copy( source.environmentRotation );

		if ( source.overrideMaterial !== null ) this.overrideMaterial = source.overrideMaterial.clone();

		this.matrixAutoUpdate = source.matrixAutoUpdate;

		return this;

	}

	toJSON( meta ) {

		const data = super.toJSON( meta );

		if ( this.fog !== null ) data.object.fog = this.fog.toJSON();

		if ( this.backgroundBlurriness > 0 ) data.object.backgroundBlurriness = this.backgroundBlurriness;
		if ( this.backgroundIntensity !== 1 ) data.object.backgroundIntensity = this.backgroundIntensity;
		data.object.backgroundRotation = this.backgroundRotation.toArray();

		if ( this.environmentIntensity !== 1 ) data.object.environmentIntensity = this.environmentIntensity;
		data.object.environmentRotation = this.environmentRotation.toArray();

		return data;

	}

}

class InterleavedBuffer {

	constructor( array, stride ) {

		this.isInterleavedBuffer = true;

		this.array = array;
		this.stride = stride;
		this.count = array !== undefined ? array.length / stride : 0;

		this.usage = StaticDrawUsage;
		this._updateRange = { offset: 0, count: - 1 };
		this.updateRanges = [];

		this.version = 0;

		this.uuid = generateUUID();

	}

	onUploadCallback() {}

	set needsUpdate( value ) {

		if ( value === true ) this.version ++;

	}

	get updateRange() {

		warnOnce( 'THREE.InterleavedBuffer: updateRange() is deprecated and will be removed in r169. Use addUpdateRange() instead.' ); // @deprecated, r159
		return this._updateRange;

	}

	setUsage( value ) {

		this.usage = value;

		return this;

	}

	addUpdateRange( start, count ) {

		this.updateRanges.push( { start, count } );

	}

	clearUpdateRanges() {

		this.updateRanges.length = 0;

	}

	copy( source ) {

		this.array = new source.array.constructor( source.array );
		this.count = source.count;
		this.stride = source.stride;
		this.usage = source.usage;

		return this;

	}

	copyAt( index1, attribute, index2 ) {

		index1 *= this.stride;
		index2 *= attribute.stride;

		for ( let i = 0, l = this.stride; i < l; i ++ ) {

			this.array[ index1 + i ] = attribute.array[ index2 + i ];

		}

		return this;

	}

	set( value, offset = 0 ) {

		this.array.set( value, offset );

		return this;

	}

	clone( data ) {

		if ( data.arrayBuffers === undefined ) {

			data.arrayBuffers = {};

		}

		if ( this.array.buffer._uuid === undefined ) {

			this.array.buffer._uuid = generateUUID();

		}

		if ( data.arrayBuffers[ this.array.buffer._uuid ] === undefined ) {

			data.arrayBuffers[ this.array.buffer._uuid ] = this.array.slice( 0 ).buffer;

		}

		const array = new this.array.constructor( data.arrayBuffers[ this.array.buffer._uuid ] );

		const ib = new this.constructor( array, this.stride );
		ib.setUsage( this.usage );

		return ib;

	}

	onUpload( callback ) {

		this.onUploadCallback = callback;

		return this;

	}

	toJSON( data ) {

		if ( data.arrayBuffers === undefined ) {

			data.arrayBuffers = {};

		}

		// generate UUID for array buffer if necessary

		if ( this.array.buffer._uuid === undefined ) {

			this.array.buffer._uuid = generateUUID();

		}

		if ( data.arrayBuffers[ this.array.buffer._uuid ] === undefined ) {

			data.arrayBuffers[ this.array.buffer._uuid ] = Array.from( new Uint32Array( this.array.buffer ) );

		}

		//

		return {
			uuid: this.uuid,
			buffer: this.array.buffer._uuid,
			type: this.array.constructor.name,
			stride: this.stride
		};

	}

}

const _vector$7 = /*@__PURE__*/ new Vector3();

class InterleavedBufferAttribute {

	constructor( interleavedBuffer, itemSize, offset, normalized = false ) {

		this.isInterleavedBufferAttribute = true;

		this.name = '';

		this.data = interleavedBuffer;
		this.itemSize = itemSize;
		this.offset = offset;

		this.normalized = normalized;

	}

	get count() {

		return this.data.count;

	}

	get array() {

		return this.data.array;

	}

	set needsUpdate( value ) {

		this.data.needsUpdate = value;

	}

	applyMatrix4( m ) {

		for ( let i = 0, l = this.data.count; i < l; i ++ ) {

			_vector$7.fromBufferAttribute( this, i );

			_vector$7.applyMatrix4( m );

			this.setXYZ( i, _vector$7.x, _vector$7.y, _vector$7.z );

		}

		return this;

	}

	applyNormalMatrix( m ) {

		for ( let i = 0, l = this.count; i < l; i ++ ) {

			_vector$7.fromBufferAttribute( this, i );

			_vector$7.applyNormalMatrix( m );

			this.setXYZ( i, _vector$7.x, _vector$7.y, _vector$7.z );

		}

		return this;

	}

	transformDirection( m ) {

		for ( let i = 0, l = this.count; i < l; i ++ ) {

			_vector$7.fromBufferAttribute( this, i );

			_vector$7.transformDirection( m );

			this.setXYZ( i, _vector$7.x, _vector$7.y, _vector$7.z );

		}

		return this;

	}

	getComponent( index, component ) {

		let value = this.array[ index * this.data.stride + this.offset + component ];

		if ( this.normalized ) value = denormalize( value, this.array );

		return value;

	}

	setComponent( index, component, value ) {

		if ( this.normalized ) value = normalize$1( value, this.array );

		this.data.array[ index * this.data.stride + this.offset + component ] = value;

		return this;

	}

	setX( index, x ) {

		if ( this.normalized ) x = normalize$1( x, this.array );

		this.data.array[ index * this.data.stride + this.offset ] = x;

		return this;

	}

	setY( index, y ) {

		if ( this.normalized ) y = normalize$1( y, this.array );

		this.data.array[ index * this.data.stride + this.offset + 1 ] = y;

		return this;

	}

	setZ( index, z ) {

		if ( this.normalized ) z = normalize$1( z, this.array );

		this.data.array[ index * this.data.stride + this.offset + 2 ] = z;

		return this;

	}

	setW( index, w ) {

		if ( this.normalized ) w = normalize$1( w, this.array );

		this.data.array[ index * this.data.stride + this.offset + 3 ] = w;

		return this;

	}

	getX( index ) {

		let x = this.data.array[ index * this.data.stride + this.offset ];

		if ( this.normalized ) x = denormalize( x, this.array );

		return x;

	}

	getY( index ) {

		let y = this.data.array[ index * this.data.stride + this.offset + 1 ];

		if ( this.normalized ) y = denormalize( y, this.array );

		return y;

	}

	getZ( index ) {

		let z = this.data.array[ index * this.data.stride + this.offset + 2 ];

		if ( this.normalized ) z = denormalize( z, this.array );

		return z;

	}

	getW( index ) {

		let w = this.data.array[ index * this.data.stride + this.offset + 3 ];

		if ( this.normalized ) w = denormalize( w, this.array );

		return w;

	}

	setXY( index, x, y ) {

		index = index * this.data.stride + this.offset;

		if ( this.normalized ) {

			x = normalize$1( x, this.array );
			y = normalize$1( y, this.array );

		}

		this.data.array[ index + 0 ] = x;
		this.data.array[ index + 1 ] = y;

		return this;

	}

	setXYZ( index, x, y, z ) {

		index = index * this.data.stride + this.offset;

		if ( this.normalized ) {

			x = normalize$1( x, this.array );
			y = normalize$1( y, this.array );
			z = normalize$1( z, this.array );

		}

		this.data.array[ index + 0 ] = x;
		this.data.array[ index + 1 ] = y;
		this.data.array[ index + 2 ] = z;

		return this;

	}

	setXYZW( index, x, y, z, w ) {

		index = index * this.data.stride + this.offset;

		if ( this.normalized ) {

			x = normalize$1( x, this.array );
			y = normalize$1( y, this.array );
			z = normalize$1( z, this.array );
			w = normalize$1( w, this.array );

		}

		this.data.array[ index + 0 ] = x;
		this.data.array[ index + 1 ] = y;
		this.data.array[ index + 2 ] = z;
		this.data.array[ index + 3 ] = w;

		return this;

	}

	clone( data ) {

		if ( data === undefined ) {

			console.log( 'THREE.InterleavedBufferAttribute.clone(): Cloning an interleaved buffer attribute will de-interleave buffer data.' );

			const array = [];

			for ( let i = 0; i < this.count; i ++ ) {

				const index = i * this.data.stride + this.offset;

				for ( let j = 0; j < this.itemSize; j ++ ) {

					array.push( this.data.array[ index + j ] );

				}

			}

			return new BufferAttribute( new this.array.constructor( array ), this.itemSize, this.normalized );

		} else {

			if ( data.interleavedBuffers === undefined ) {

				data.interleavedBuffers = {};

			}

			if ( data.interleavedBuffers[ this.data.uuid ] === undefined ) {

				data.interleavedBuffers[ this.data.uuid ] = this.data.clone( data );

			}

			return new InterleavedBufferAttribute( data.interleavedBuffers[ this.data.uuid ], this.itemSize, this.offset, this.normalized );

		}

	}

	toJSON( data ) {

		if ( data === undefined ) {

			console.log( 'THREE.InterleavedBufferAttribute.toJSON(): Serializing an interleaved buffer attribute will de-interleave buffer data.' );

			const array = [];

			for ( let i = 0; i < this.count; i ++ ) {

				const index = i * this.data.stride + this.offset;

				for ( let j = 0; j < this.itemSize; j ++ ) {

					array.push( this.data.array[ index + j ] );

				}

			}

			// de-interleave data and save it as an ordinary buffer attribute for now

			return {
				itemSize: this.itemSize,
				type: this.array.constructor.name,
				array: array,
				normalized: this.normalized
			};

		} else {

			// save as true interleaved attribute

			if ( data.interleavedBuffers === undefined ) {

				data.interleavedBuffers = {};

			}

			if ( data.interleavedBuffers[ this.data.uuid ] === undefined ) {

				data.interleavedBuffers[ this.data.uuid ] = this.data.toJSON( data );

			}

			return {
				isInterleavedBufferAttribute: true,
				itemSize: this.itemSize,
				data: this.data.uuid,
				offset: this.offset,
				normalized: this.normalized
			};

		}

	}

}

class SpriteMaterial extends Material {

	constructor( parameters ) {

		super();

		this.isSpriteMaterial = true;

		this.type = 'SpriteMaterial';

		this.color = new Color( 0xffffff );

		this.map = null;

		this.alphaMap = null;

		this.rotation = 0;

		this.sizeAttenuation = true;

		this.transparent = true;

		this.fog = true;

		this.setValues( parameters );

	}

	copy( source ) {

		super.copy( source );

		this.color.copy( source.color );

		this.map = source.map;

		this.alphaMap = source.alphaMap;

		this.rotation = source.rotation;

		this.sizeAttenuation = source.sizeAttenuation;

		this.fog = source.fog;

		return this;

	}

}

let _geometry$1;

const _intersectPoint = /*@__PURE__*/ new Vector3();
const _worldScale = /*@__PURE__*/ new Vector3();
const _mvPosition = /*@__PURE__*/ new Vector3();

const _alignedPosition = /*@__PURE__*/ new Vector2();
const _rotatedPosition = /*@__PURE__*/ new Vector2();
const _viewWorldMatrix = /*@__PURE__*/ new Matrix4();

const _vA = /*@__PURE__*/ new Vector3();
const _vB = /*@__PURE__*/ new Vector3();
const _vC = /*@__PURE__*/ new Vector3();

const _uvA = /*@__PURE__*/ new Vector2();
const _uvB = /*@__PURE__*/ new Vector2();
const _uvC = /*@__PURE__*/ new Vector2();

class Sprite extends Object3D {

	constructor( material = new SpriteMaterial() ) {

		super();

		this.isSprite = true;

		this.type = 'Sprite';

		if ( _geometry$1 === undefined ) {

			_geometry$1 = new BufferGeometry();

			const float32Array = new Float32Array( [
				- 0.5, - 0.5, 0, 0, 0,
				0.5, - 0.5, 0, 1, 0,
				0.5, 0.5, 0, 1, 1,
				- 0.5, 0.5, 0, 0, 1
			] );

			const interleavedBuffer = new InterleavedBuffer( float32Array, 5 );

			_geometry$1.setIndex( [ 0, 1, 2,	0, 2, 3 ] );
			_geometry$1.setAttribute( 'position', new InterleavedBufferAttribute( interleavedBuffer, 3, 0, false ) );
			_geometry$1.setAttribute( 'uv', new InterleavedBufferAttribute( interleavedBuffer, 2, 3, false ) );

		}

		this.geometry = _geometry$1;
		this.material = material;

		this.center = new Vector2( 0.5, 0.5 );

	}

	raycast( raycaster, intersects ) {

		if ( raycaster.camera === null ) {

			console.error( 'THREE.Sprite: "Raycaster.camera" needs to be set in order to raycast against sprites.' );

		}

		_worldScale.setFromMatrixScale( this.matrixWorld );

		_viewWorldMatrix.copy( raycaster.camera.matrixWorld );
		this.modelViewMatrix.multiplyMatrices( raycaster.camera.matrixWorldInverse, this.matrixWorld );

		_mvPosition.setFromMatrixPosition( this.modelViewMatrix );

		if ( raycaster.camera.isPerspectiveCamera && this.material.sizeAttenuation === false ) {

			_worldScale.multiplyScalar( - _mvPosition.z );

		}

		const rotation = this.material.rotation;
		let sin, cos;

		if ( rotation !== 0 ) {

			cos = Math.cos( rotation );
			sin = Math.sin( rotation );

		}

		const center = this.center;

		transformVertex( _vA.set( - 0.5, - 0.5, 0 ), _mvPosition, center, _worldScale, sin, cos );
		transformVertex( _vB.set( 0.5, - 0.5, 0 ), _mvPosition, center, _worldScale, sin, cos );
		transformVertex( _vC.set( 0.5, 0.5, 0 ), _mvPosition, center, _worldScale, sin, cos );

		_uvA.set( 0, 0 );
		_uvB.set( 1, 0 );
		_uvC.set( 1, 1 );

		// check first triangle
		let intersect = raycaster.ray.intersectTriangle( _vA, _vB, _vC, false, _intersectPoint );

		if ( intersect === null ) {

			// check second triangle
			transformVertex( _vB.set( - 0.5, 0.5, 0 ), _mvPosition, center, _worldScale, sin, cos );
			_uvB.set( 0, 1 );

			intersect = raycaster.ray.intersectTriangle( _vA, _vC, _vB, false, _intersectPoint );
			if ( intersect === null ) {

				return;

			}

		}

		const distance = raycaster.ray.origin.distanceTo( _intersectPoint );

		if ( distance < raycaster.near || distance > raycaster.far ) return;

		intersects.push( {

			distance: distance,
			point: _intersectPoint.clone(),
			uv: Triangle.getInterpolation( _intersectPoint, _vA, _vB, _vC, _uvA, _uvB, _uvC, new Vector2() ),
			face: null,
			object: this

		} );

	}

	copy( source, recursive ) {

		super.copy( source, recursive );

		if ( source.center !== undefined ) this.center.copy( source.center );

		this.material = source.material;

		return this;

	}

}

function transformVertex( vertexPosition, mvPosition, center, scale, sin, cos ) {

	// compute position in camera space
	_alignedPosition.subVectors( vertexPosition, center ).addScalar( 0.5 ).multiply( scale );

	// to check if rotation is not zero
	if ( sin !== undefined ) {

		_rotatedPosition.x = ( cos * _alignedPosition.x ) - ( sin * _alignedPosition.y );
		_rotatedPosition.y = ( sin * _alignedPosition.x ) + ( cos * _alignedPosition.y );

	} else {

		_rotatedPosition.copy( _alignedPosition );

	}


	vertexPosition.copy( mvPosition );
	vertexPosition.x += _rotatedPosition.x;
	vertexPosition.y += _rotatedPosition.y;

	// transform to world space
	vertexPosition.applyMatrix4( _viewWorldMatrix );

}

const _v1$2 = /*@__PURE__*/ new Vector3();
const _v2$1 = /*@__PURE__*/ new Vector3();

class LOD extends Object3D {

	constructor() {

		super();

		this._currentLevel = 0;

		this.type = 'LOD';

		Object.defineProperties( this, {
			levels: {
				enumerable: true,
				value: []
			},
			isLOD: {
				value: true,
			}
		} );

		this.autoUpdate = true;

	}

	copy( source ) {

		super.copy( source, false );

		const levels = source.levels;

		for ( let i = 0, l = levels.length; i < l; i ++ ) {

			const level = levels[ i ];

			this.addLevel( level.object.clone(), level.distance, level.hysteresis );

		}

		this.autoUpdate = source.autoUpdate;

		return this;

	}

	addLevel( object, distance = 0, hysteresis = 0 ) {

		distance = Math.abs( distance );

		const levels = this.levels;

		let l;

		for ( l = 0; l < levels.length; l ++ ) {

			if ( distance < levels[ l ].distance ) {

				break;

			}

		}

		levels.splice( l, 0, { distance: distance, hysteresis: hysteresis, object: object } );

		this.add( object );

		return this;

	}

	getCurrentLevel() {

		return this._currentLevel;

	}



	getObjectForDistance( distance ) {

		const levels = this.levels;

		if ( levels.length > 0 ) {

			let i, l;

			for ( i = 1, l = levels.length; i < l; i ++ ) {

				let levelDistance = levels[ i ].distance;

				if ( levels[ i ].object.visible ) {

					levelDistance -= levelDistance * levels[ i ].hysteresis;

				}

				if ( distance < levelDistance ) {

					break;

				}

			}

			return levels[ i - 1 ].object;

		}

		return null;

	}

	raycast( raycaster, intersects ) {

		const levels = this.levels;

		if ( levels.length > 0 ) {

			_v1$2.setFromMatrixPosition( this.matrixWorld );

			const distance = raycaster.ray.origin.distanceTo( _v1$2 );

			this.getObjectForDistance( distance ).raycast( raycaster, intersects );

		}

	}

	update( camera ) {

		const levels = this.levels;

		if ( levels.length > 1 ) {

			_v1$2.setFromMatrixPosition( camera.matrixWorld );
			_v2$1.setFromMatrixPosition( this.matrixWorld );

			const distance = _v1$2.distanceTo( _v2$1 ) / camera.zoom;

			levels[ 0 ].object.visible = true;

			let i, l;

			for ( i = 1, l = levels.length; i < l; i ++ ) {

				let levelDistance = levels[ i ].distance;

				if ( levels[ i ].object.visible ) {

					levelDistance -= levelDistance * levels[ i ].hysteresis;

				}

				if ( distance >= levelDistance ) {

					levels[ i - 1 ].object.visible = false;
					levels[ i ].object.visible = true;

				} else {

					break;

				}

			}

			this._currentLevel = i - 1;

			for ( ; i < l; i ++ ) {

				levels[ i ].object.visible = false;

			}

		}

	}

	toJSON( meta ) {

		const data = super.toJSON( meta );

		if ( this.autoUpdate === false ) data.object.autoUpdate = false;

		data.object.levels = [];

		const levels = this.levels;

		for ( let i = 0, l = levels.length; i < l; i ++ ) {

			const level = levels[ i ];

			data.object.levels.push( {
				object: level.object.uuid,
				distance: level.distance,
				hysteresis: level.hysteresis
			} );

		}

		return data;

	}

}

const _basePosition = /*@__PURE__*/ new Vector3();

const _skinIndex = /*@__PURE__*/ new Vector4();
const _skinWeight = /*@__PURE__*/ new Vector4();

const _vector3$1 = /*@__PURE__*/ new Vector3();
const _matrix4 = /*@__PURE__*/ new Matrix4();
const _vertex = /*@__PURE__*/ new Vector3();

const _sphere$5 = /*@__PURE__*/ new Sphere();
const _inverseMatrix$2 = /*@__PURE__*/ new Matrix4();
const _ray$2 = /*@__PURE__*/ new Ray();

class SkinnedMesh extends Mesh {

	constructor( geometry, material ) {

		super( geometry, material );

		this.isSkinnedMesh = true;

		this.type = 'SkinnedMesh';

		this.bindMode = AttachedBindMode;
		this.bindMatrix = new Matrix4();
		this.bindMatrixInverse = new Matrix4();

		this.boundingBox = null;
		this.boundingSphere = null;

	}

	computeBoundingBox() {

		const geometry = this.geometry;

		if ( this.boundingBox === null ) {

			this.boundingBox = new Box3();

		}

		this.boundingBox.makeEmpty();

		const positionAttribute = geometry.getAttribute( 'position' );

		for ( let i = 0; i < positionAttribute.count; i ++ ) {

			this.getVertexPosition( i, _vertex );
			this.boundingBox.expandByPoint( _vertex );

		}

	}

	computeBoundingSphere() {

		const geometry = this.geometry;

		if ( this.boundingSphere === null ) {

			this.boundingSphere = new Sphere();

		}

		this.boundingSphere.makeEmpty();

		const positionAttribute = geometry.getAttribute( 'position' );

		for ( let i = 0; i < positionAttribute.count; i ++ ) {

			this.getVertexPosition( i, _vertex );
			this.boundingSphere.expandByPoint( _vertex );

		}

	}

	copy( source, recursive ) {

		super.copy( source, recursive );

		this.bindMode = source.bindMode;
		this.bindMatrix.copy( source.bindMatrix );
		this.bindMatrixInverse.copy( source.bindMatrixInverse );

		this.skeleton = source.skeleton;

		if ( source.boundingBox !== null ) this.boundingBox = source.boundingBox.clone();
		if ( source.boundingSphere !== null ) this.boundingSphere = source.boundingSphere.clone();

		return this;

	}

	raycast( raycaster, intersects ) {

		const material = this.material;
		const matrixWorld = this.matrixWorld;

		if ( material === undefined ) return;

		// test with bounding sphere in world space

		if ( this.boundingSphere === null ) this.computeBoundingSphere();

		_sphere$5.copy( this.boundingSphere );
		_sphere$5.applyMatrix4( matrixWorld );

		if ( raycaster.ray.intersectsSphere( _sphere$5 ) === false ) return;

		// convert ray to local space of skinned mesh

		_inverseMatrix$2.copy( matrixWorld ).invert();
		_ray$2.copy( raycaster.ray ).applyMatrix4( _inverseMatrix$2 );

		// test with bounding box in local space

		if ( this.boundingBox !== null ) {

			if ( _ray$2.intersectsBox( this.boundingBox ) === false ) return;

		}

		// test for intersections with geometry

		this._computeIntersections( raycaster, intersects, _ray$2 );

	}

	getVertexPosition( index, target ) {

		super.getVertexPosition( index, target );

		this.applyBoneTransform( index, target );

		return target;

	}

	bind( skeleton, bindMatrix ) {

		this.skeleton = skeleton;

		if ( bindMatrix === undefined ) {

			this.updateMatrixWorld( true );

			this.skeleton.calculateInverses();

			bindMatrix = this.matrixWorld;

		}

		this.bindMatrix.copy( bindMatrix );
		this.bindMatrixInverse.copy( bindMatrix ).invert();

	}

	pose() {

		this.skeleton.pose();

	}

	normalizeSkinWeights() {

		const vector = new Vector4();

		const skinWeight = this.geometry.attributes.skinWeight;

		for ( let i = 0, l = skinWeight.count; i < l; i ++ ) {

			vector.fromBufferAttribute( skinWeight, i );

			const scale = 1.0 / vector.manhattanLength();

			if ( scale !== Infinity ) {

				vector.multiplyScalar( scale );

			} else {

				vector.set( 1, 0, 0, 0 ); // do something reasonable

			}

			skinWeight.setXYZW( i, vector.x, vector.y, vector.z, vector.w );

		}

	}

	updateMatrixWorld( force ) {

		super.updateMatrixWorld( force );

		if ( this.bindMode === AttachedBindMode ) {

			this.bindMatrixInverse.copy( this.matrixWorld ).invert();

		} else if ( this.bindMode === DetachedBindMode ) {

			this.bindMatrixInverse.copy( this.bindMatrix ).invert();

		} else {

			console.warn( 'THREE.SkinnedMesh: Unrecognized bindMode: ' + this.bindMode );

		}

	}

	applyBoneTransform( index, vector ) {

		const skeleton = this.skeleton;
		const geometry = this.geometry;

		_skinIndex.fromBufferAttribute( geometry.attributes.skinIndex, index );
		_skinWeight.fromBufferAttribute( geometry.attributes.skinWeight, index );

		_basePosition.copy( vector ).applyMatrix4( this.bindMatrix );

		vector.set( 0, 0, 0 );

		for ( let i = 0; i < 4; i ++ ) {

			const weight = _skinWeight.getComponent( i );

			if ( weight !== 0 ) {

				const boneIndex = _skinIndex.getComponent( i );

				_matrix4.multiplyMatrices( skeleton.bones[ boneIndex ].matrixWorld, skeleton.boneInverses[ boneIndex ] );

				vector.addScaledVector( _vector3$1.copy( _basePosition ).applyMatrix4( _matrix4 ), weight );

			}

		}

		return vector.applyMatrix4( this.bindMatrixInverse );

	}

}

class Bone extends Object3D {

	constructor() {

		super();

		this.isBone = true;

		this.type = 'Bone';

	}

}

class DataTexture extends Texture {

	constructor( data = null, width = 1, height = 1, format, type, mapping, wrapS, wrapT, magFilter = NearestFilter, minFilter = NearestFilter, anisotropy, colorSpace ) {

		super( null, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy, colorSpace );

		this.isDataTexture = true;

		this.image = { data: data, width: width, height: height };

		this.generateMipmaps = false;
		this.flipY = false;
		this.unpackAlignment = 1;

	}

}

const _offsetMatrix = /*@__PURE__*/ new Matrix4();
const _identityMatrix$1 = /*@__PURE__*/ new Matrix4();

class Skeleton {

	constructor( bones = [], boneInverses = [] ) {

		this.uuid = generateUUID();

		this.bones = bones.slice( 0 );
		this.boneInverses = boneInverses;
		this.boneMatrices = null;

		this.boneTexture = null;

		this.init();

	}

	init() {

		const bones = this.bones;
		const boneInverses = this.boneInverses;

		this.boneMatrices = new Float32Array( bones.length * 16 );

		// calculate inverse bone matrices if necessary

		if ( boneInverses.length === 0 ) {

			this.calculateInverses();

		} else {

			// handle special case

			if ( bones.length !== boneInverses.length ) {

				console.warn( 'THREE.Skeleton: Number of inverse bone matrices does not match amount of bones.' );

				this.boneInverses = [];

				for ( let i = 0, il = this.bones.length; i < il; i ++ ) {

					this.boneInverses.push( new Matrix4() );

				}

			}

		}

	}

	calculateInverses() {

		this.boneInverses.length = 0;

		for ( let i = 0, il = this.bones.length; i < il; i ++ ) {

			const inverse = new Matrix4();

			if ( this.bones[ i ] ) {

				inverse.copy( this.bones[ i ].matrixWorld ).invert();

			}

			this.boneInverses.push( inverse );

		}

	}

	pose() {

		// recover the bind-time world matrices

		for ( let i = 0, il = this.bones.length; i < il; i ++ ) {

			const bone = this.bones[ i ];

			if ( bone ) {

				bone.matrixWorld.copy( this.boneInverses[ i ] ).invert();

			}

		}

		// compute the local matrices, positions, rotations and scales

		for ( let i = 0, il = this.bones.length; i < il; i ++ ) {

			const bone = this.bones[ i ];

			if ( bone ) {

				if ( bone.parent && bone.parent.isBone ) {

					bone.matrix.copy( bone.parent.matrixWorld ).invert();
					bone.matrix.multiply( bone.matrixWorld );

				} else {

					bone.matrix.copy( bone.matrixWorld );

				}

				bone.matrix.decompose( bone.position, bone.quaternion, bone.scale );

			}

		}

	}

	update() {

		const bones = this.bones;
		const boneInverses = this.boneInverses;
		const boneMatrices = this.boneMatrices;
		const boneTexture = this.boneTexture;

		// flatten bone matrices to array

		for ( let i = 0, il = bones.length; i < il; i ++ ) {

			// compute the offset between the current and the original transform

			const matrix = bones[ i ] ? bones[ i ].matrixWorld : _identityMatrix$1;

			_offsetMatrix.multiplyMatrices( matrix, boneInverses[ i ] );
			_offsetMatrix.toArray( boneMatrices, i * 16 );

		}

		if ( boneTexture !== null ) {

			boneTexture.needsUpdate = true;

		}

	}

	clone() {

		return new Skeleton( this.bones, this.boneInverses );

	}

	computeBoneTexture() {

		// layout (1 matrix = 4 pixels)
		//      RGBA RGBA RGBA RGBA (=> column1, column2, column3, column4)
		//  with  8x8  pixel texture max   16 bones * 4 pixels =  (8 * 8)
		//       16x16 pixel texture max   64 bones * 4 pixels = (16 * 16)
		//       32x32 pixel texture max  256 bones * 4 pixels = (32 * 32)
		//       64x64 pixel texture max 1024 bones * 4 pixels = (64 * 64)

		let size = Math.sqrt( this.bones.length * 4 ); // 4 pixels needed for 1 matrix
		size = Math.ceil( size / 4 ) * 4;
		size = Math.max( size, 4 );

		const boneMatrices = new Float32Array( size * size * 4 ); // 4 floats per RGBA pixel
		boneMatrices.set( this.boneMatrices ); // copy current values

		const boneTexture = new DataTexture( boneMatrices, size, size, RGBAFormat, FloatType );
		boneTexture.needsUpdate = true;

		this.boneMatrices = boneMatrices;
		this.boneTexture = boneTexture;

		return this;

	}

	getBoneByName( name ) {

		for ( let i = 0, il = this.bones.length; i < il; i ++ ) {

			const bone = this.bones[ i ];

			if ( bone.name === name ) {

				return bone;

			}

		}

		return undefined;

	}

	dispose( ) {

		if ( this.boneTexture !== null ) {

			this.boneTexture.dispose();

			this.boneTexture = null;

		}

	}

	fromJSON( json, bones ) {

		this.uuid = json.uuid;

		for ( let i = 0, l = json.bones.length; i < l; i ++ ) {

			const uuid = json.bones[ i ];
			let bone = bones[ uuid ];

			if ( bone === undefined ) {

				console.warn( 'THREE.Skeleton: No bone found with UUID:', uuid );
				bone = new Bone();

			}

			this.bones.push( bone );
			this.boneInverses.push( new Matrix4().fromArray( json.boneInverses[ i ] ) );

		}

		this.init();

		return this;

	}

	toJSON() {

		const data = {
			metadata: {
				version: 4.6,
				type: 'Skeleton',
				generator: 'Skeleton.toJSON'
			},
			bones: [],
			boneInverses: []
		};

		data.uuid = this.uuid;

		const bones = this.bones;
		const boneInverses = this.boneInverses;

		for ( let i = 0, l = bones.length; i < l; i ++ ) {

			const bone = bones[ i ];
			data.bones.push( bone.uuid );

			const boneInverse = boneInverses[ i ];
			data.boneInverses.push( boneInverse.toArray() );

		}

		return data;

	}

}

class InstancedBufferAttribute extends BufferAttribute {

	constructor( array, itemSize, normalized, meshPerAttribute = 1 ) {

		super( array, itemSize, normalized );

		this.isInstancedBufferAttribute = true;

		this.meshPerAttribute = meshPerAttribute;

	}

	copy( source ) {

		super.copy( source );

		this.meshPerAttribute = source.meshPerAttribute;

		return this;

	}

	toJSON() {

		const data = super.toJSON();

		data.meshPerAttribute = this.meshPerAttribute;

		data.isInstancedBufferAttribute = true;

		return data;

	}

}

const _instanceLocalMatrix = /*@__PURE__*/ new Matrix4();
const _instanceWorldMatrix = /*@__PURE__*/ new Matrix4();

const _instanceIntersects = [];

const _box3 = /*@__PURE__*/ new Box3();
const _identity = /*@__PURE__*/ new Matrix4();
const _mesh$1 = /*@__PURE__*/ new Mesh();
const _sphere$4 = /*@__PURE__*/ new Sphere();

class InstancedMesh extends Mesh {

	constructor( geometry, material, count ) {

		super( geometry, material );

		this.isInstancedMesh = true;

		this.instanceMatrix = new InstancedBufferAttribute( new Float32Array( count * 16 ), 16 );
		this.instanceColor = null;
		this.morphTexture = null;

		this.count = count;

		this.boundingBox = null;
		this.boundingSphere = null;

		for ( let i = 0; i < count; i ++ ) {

			this.setMatrixAt( i, _identity );

		}

	}

	computeBoundingBox() {

		const geometry = this.geometry;
		const count = this.count;

		if ( this.boundingBox === null ) {

			this.boundingBox = new Box3();

		}

		if ( geometry.boundingBox === null ) {

			geometry.computeBoundingBox();

		}

		this.boundingBox.makeEmpty();

		for ( let i = 0; i < count; i ++ ) {

			this.getMatrixAt( i, _instanceLocalMatrix );

			_box3.copy( geometry.boundingBox ).applyMatrix4( _instanceLocalMatrix );

			this.boundingBox.union( _box3 );

		}

	}

	computeBoundingSphere() {

		const geometry = this.geometry;
		const count = this.count;

		if ( this.boundingSphere === null ) {

			this.boundingSphere = new Sphere();

		}

		if ( geometry.boundingSphere === null ) {

			geometry.computeBoundingSphere();

		}

		this.boundingSphere.makeEmpty();

		for ( let i = 0; i < count; i ++ ) {

			this.getMatrixAt( i, _instanceLocalMatrix );

			_sphere$4.copy( geometry.boundingSphere ).applyMatrix4( _instanceLocalMatrix );

			this.boundingSphere.union( _sphere$4 );

		}

	}

	copy( source, recursive ) {

		super.copy( source, recursive );

		this.instanceMatrix.copy( source.instanceMatrix );

		if ( source.morphTexture !== null ) this.morphTexture = source.morphTexture.clone();
		if ( source.instanceColor !== null ) this.instanceColor = source.instanceColor.clone();

		this.count = source.count;

		if ( source.boundingBox !== null ) this.boundingBox = source.boundingBox.clone();
		if ( source.boundingSphere !== null ) this.boundingSphere = source.boundingSphere.clone();

		return this;

	}

	getColorAt( index, color ) {

		color.fromArray( this.instanceColor.array, index * 3 );

	}

	getMatrixAt( index, matrix ) {

		matrix.fromArray( this.instanceMatrix.array, index * 16 );

	}

	getMorphAt( index, object ) {

		const objectInfluences = object.morphTargetInfluences;

		const array = this.morphTexture.source.data.data;

		const len = objectInfluences.length + 1; // All influences + the baseInfluenceSum

		const dataIndex = index * len + 1; // Skip the baseInfluenceSum at the beginning

		for ( let i = 0; i < objectInfluences.length; i ++ ) {

			objectInfluences[ i ] = array[ dataIndex + i ];

		}

	}

	raycast( raycaster, intersects ) {

		const matrixWorld = this.matrixWorld;
		const raycastTimes = this.count;

		_mesh$1.geometry = this.geometry;
		_mesh$1.material = this.material;

		if ( _mesh$1.material === undefined ) return;

		// test with bounding sphere first

		if ( this.boundingSphere === null ) this.computeBoundingSphere();

		_sphere$4.copy( this.boundingSphere );
		_sphere$4.applyMatrix4( matrixWorld );

		if ( raycaster.ray.intersectsSphere( _sphere$4 ) === false ) return;

		// now test each instance

		for ( let instanceId = 0; instanceId < raycastTimes; instanceId ++ ) {

			// calculate the world matrix for each instance

			this.getMatrixAt( instanceId, _instanceLocalMatrix );

			_instanceWorldMatrix.multiplyMatrices( matrixWorld, _instanceLocalMatrix );

			// the mesh represents this single instance

			_mesh$1.matrixWorld = _instanceWorldMatrix;

			_mesh$1.raycast( raycaster, _instanceIntersects );

			// process the result of raycast

			for ( let i = 0, l = _instanceIntersects.length; i < l; i ++ ) {

				const intersect = _instanceIntersects[ i ];
				intersect.instanceId = instanceId;
				intersect.object = this;
				intersects.push( intersect );

			}

			_instanceIntersects.length = 0;

		}

	}

	setColorAt( index, color ) {

		if ( this.instanceColor === null ) {

			this.instanceColor = new InstancedBufferAttribute( new Float32Array( this.instanceMatrix.count * 3 ), 3 );

		}

		color.toArray( this.instanceColor.array, index * 3 );

	}

	setMatrixAt( index, matrix ) {

		matrix.toArray( this.instanceMatrix.array, index * 16 );

	}

	setMorphAt( index, object ) {

		const objectInfluences = object.morphTargetInfluences;

		const len = objectInfluences.length + 1; // morphBaseInfluence + all influences

		if ( this.morphTexture === null ) {

			this.morphTexture = new DataTexture( new Float32Array( len * this.count ), len, this.count, RedFormat, FloatType );

		}

		const array = this.morphTexture.source.data.data;

		let morphInfluencesSum = 0;

		for ( let i = 0; i < objectInfluences.length; i ++ ) {

			morphInfluencesSum += objectInfluences[ i ];

		}

		const morphBaseInfluence = this.geometry.morphTargetsRelative ? 1 : 1 - morphInfluencesSum;

		const dataIndex = len * index;

		array[ dataIndex ] = morphBaseInfluence;

		array.set( objectInfluences, dataIndex + 1 );

	}

	updateMorphTargets() {

	}

	dispose() {

		this.dispatchEvent( { type: 'dispose' } );

		if ( this.morphTexture !== null ) {

			this.morphTexture.dispose();
			this.morphTexture = null;

		}

		return this;

	}

}

const _vector1 = /*@__PURE__*/ new Vector3();
const _vector2 = /*@__PURE__*/ new Vector3();
const _normalMatrix = /*@__PURE__*/ new Matrix3();

class Plane {

	constructor( normal = new Vector3( 1, 0, 0 ), constant = 0 ) {

		this.isPlane = true;

		// normal is assumed to be normalized

		this.normal = normal;
		this.constant = constant;

	}

	set( normal, constant ) {

		this.normal.copy( normal );
		this.constant = constant;

		return this;

	}

	setComponents( x, y, z, w ) {

		this.normal.set( x, y, z );
		this.constant = w;

		return this;

	}

	setFromNormalAndCoplanarPoint( normal, point ) {

		this.normal.copy( normal );
		this.constant = - point.dot( this.normal );

		return this;

	}

	setFromCoplanarPoints( a, b, c ) {

		const normal = _vector1.subVectors( c, b ).cross( _vector2.subVectors( a, b ) ).normalize();

		// Q: should an error be thrown if normal is zero (e.g. degenerate plane)?

		this.setFromNormalAndCoplanarPoint( normal, a );

		return this;

	}

	copy( plane ) {

		this.normal.copy( plane.normal );
		this.constant = plane.constant;

		return this;

	}

	normalize() {

		// Note: will lead to a divide by zero if the plane is invalid.

		const inverseNormalLength = 1.0 / this.normal.length();
		this.normal.multiplyScalar( inverseNormalLength );
		this.constant *= inverseNormalLength;

		return this;

	}

	negate() {

		this.constant *= - 1;
		this.normal.negate();

		return this;

	}

	distanceToPoint( point ) {

		return this.normal.dot( point ) + this.constant;

	}

	distanceToSphere( sphere ) {

		return this.distanceToPoint( sphere.center ) - sphere.radius;

	}

	projectPoint( point, target ) {

		return target.copy( point ).addScaledVector( this.normal, - this.distanceToPoint( point ) );

	}

	intersectLine( line, target ) {

		const direction = line.delta( _vector1 );

		const denominator = this.normal.dot( direction );

		if ( denominator === 0 ) {

			// line is coplanar, return origin
			if ( this.distanceToPoint( line.start ) === 0 ) {

				return target.copy( line.start );

			}

			// Unsure if this is the correct method to handle this case.
			return null;

		}

		const t = - ( line.start.dot( this.normal ) + this.constant ) / denominator;

		if ( t < 0 || t > 1 ) {

			return null;

		}

		return target.copy( line.start ).addScaledVector( direction, t );

	}

	intersectsLine( line ) {

		// Note: this tests if a line intersects the plane, not whether it (or its end-points) are coplanar with it.

		const startSign = this.distanceToPoint( line.start );
		const endSign = this.distanceToPoint( line.end );

		return ( startSign < 0 && endSign > 0 ) || ( endSign < 0 && startSign > 0 );

	}

	intersectsBox( box ) {

		return box.intersectsPlane( this );

	}

	intersectsSphere( sphere ) {

		return sphere.intersectsPlane( this );

	}

	coplanarPoint( target ) {

		return target.copy( this.normal ).multiplyScalar( - this.constant );

	}

	applyMatrix4( matrix, optionalNormalMatrix ) {

		const normalMatrix = optionalNormalMatrix || _normalMatrix.getNormalMatrix( matrix );

		const referencePoint = this.coplanarPoint( _vector1 ).applyMatrix4( matrix );

		const normal = this.normal.applyMatrix3( normalMatrix ).normalize();

		this.constant = - referencePoint.dot( normal );

		return this;

	}

	translate( offset ) {

		this.constant -= offset.dot( this.normal );

		return this;

	}

	equals( plane ) {

		return plane.normal.equals( this.normal ) && ( plane.constant === this.constant );

	}

	clone() {

		return new this.constructor().copy( this );

	}

}

const _sphere$3 = /*@__PURE__*/ new Sphere();
const _vector$6 = /*@__PURE__*/ new Vector3();

class Frustum {

	constructor( p0 = new Plane(), p1 = new Plane(), p2 = new Plane(), p3 = new Plane(), p4 = new Plane(), p5 = new Plane() ) {

		this.planes = [ p0, p1, p2, p3, p4, p5 ];

	}

	set( p0, p1, p2, p3, p4, p5 ) {

		const planes = this.planes;

		planes[ 0 ].copy( p0 );
		planes[ 1 ].copy( p1 );
		planes[ 2 ].copy( p2 );
		planes[ 3 ].copy( p3 );
		planes[ 4 ].copy( p4 );
		planes[ 5 ].copy( p5 );

		return this;

	}

	copy( frustum ) {

		const planes = this.planes;

		for ( let i = 0; i < 6; i ++ ) {

			planes[ i ].copy( frustum.planes[ i ] );

		}

		return this;

	}

	setFromProjectionMatrix( m, coordinateSystem = WebGLCoordinateSystem ) {

		const planes = this.planes;
		const me = m.elements;
		const me0 = me[ 0 ], me1 = me[ 1 ], me2 = me[ 2 ], me3 = me[ 3 ];
		const me4 = me[ 4 ], me5 = me[ 5 ], me6 = me[ 6 ], me7 = me[ 7 ];
		const me8 = me[ 8 ], me9 = me[ 9 ], me10 = me[ 10 ], me11 = me[ 11 ];
		const me12 = me[ 12 ], me13 = me[ 13 ], me14 = me[ 14 ], me15 = me[ 15 ];

		planes[ 0 ].setComponents( me3 - me0, me7 - me4, me11 - me8, me15 - me12 ).normalize();
		planes[ 1 ].setComponents( me3 + me0, me7 + me4, me11 + me8, me15 + me12 ).normalize();
		planes[ 2 ].setComponents( me3 + me1, me7 + me5, me11 + me9, me15 + me13 ).normalize();
		planes[ 3 ].setComponents( me3 - me1, me7 - me5, me11 - me9, me15 - me13 ).normalize();
		planes[ 4 ].setComponents( me3 - me2, me7 - me6, me11 - me10, me15 - me14 ).normalize();

		if ( coordinateSystem === WebGLCoordinateSystem ) {

			planes[ 5 ].setComponents( me3 + me2, me7 + me6, me11 + me10, me15 + me14 ).normalize();

		} else if ( coordinateSystem === WebGPUCoordinateSystem ) {

			planes[ 5 ].setComponents( me2, me6, me10, me14 ).normalize();

		} else {

			throw new Error( 'THREE.Frustum.setFromProjectionMatrix(): Invalid coordinate system: ' + coordinateSystem );

		}

		return this;

	}

	intersectsObject( object ) {

		if ( object.boundingSphere !== undefined ) {

			if ( object.boundingSphere === null ) object.computeBoundingSphere();

			_sphere$3.copy( object.boundingSphere ).applyMatrix4( object.matrixWorld );

		} else {

			const geometry = object.geometry;

			if ( geometry.boundingSphere === null ) geometry.computeBoundingSphere();

			_sphere$3.copy( geometry.boundingSphere ).applyMatrix4( object.matrixWorld );

		}

		return this.intersectsSphere( _sphere$3 );

	}

	intersectsSprite( sprite ) {

		_sphere$3.center.set( 0, 0, 0 );
		_sphere$3.radius = 0.7071067811865476;
		_sphere$3.applyMatrix4( sprite.matrixWorld );

		return this.intersectsSphere( _sphere$3 );

	}

	intersectsSphere( sphere ) {

		const planes = this.planes;
		const center = sphere.center;
		const negRadius = - sphere.radius;

		for ( let i = 0; i < 6; i ++ ) {

			const distance = planes[ i ].distanceToPoint( center );

			if ( distance < negRadius ) {

				return false;

			}

		}

		return true;

	}

	intersectsBox( box ) {

		const planes = this.planes;

		for ( let i = 0; i < 6; i ++ ) {

			const plane = planes[ i ];

			// corner at max distance

			_vector$6.x = plane.normal.x > 0 ? box.max.x : box.min.x;
			_vector$6.y = plane.normal.y > 0 ? box.max.y : box.min.y;
			_vector$6.z = plane.normal.z > 0 ? box.max.z : box.min.z;

			if ( plane.distanceToPoint( _vector$6 ) < 0 ) {

				return false;

			}

		}

		return true;

	}

	containsPoint( point ) {

		const planes = this.planes;

		for ( let i = 0; i < 6; i ++ ) {

			if ( planes[ i ].distanceToPoint( point ) < 0 ) {

				return false;

			}

		}

		return true;

	}

	clone() {

		return new this.constructor().copy( this );

	}

}

function sortOpaque( a, b ) {

	return a.z - b.z;

}

function sortTransparent( a, b ) {

	return b.z - a.z;

}

class MultiDrawRenderList {

	constructor() {

		this.index = 0;
		this.pool = [];
		this.list = [];

	}

	push( drawRange, z, index ) {

		const pool = this.pool;
		const list = this.list;
		if ( this.index >= pool.length ) {

			pool.push( {

				start: - 1,
				count: - 1,
				z: - 1,
				index: - 1,

			} );

		}

		const item = pool[ this.index ];
		list.push( item );
		this.index ++;

		item.start = drawRange.start;
		item.count = drawRange.count;
		item.z = z;
		item.index = index;

	}

	reset() {

		this.list.length = 0;
		this.index = 0;

	}

}

const _matrix$1 = /*@__PURE__*/ new Matrix4();
const _invMatrixWorld = /*@__PURE__*/ new Matrix4();
const _identityMatrix = /*@__PURE__*/ new Matrix4();
const _whiteColor = /*@__PURE__*/ new Color( 1, 1, 1 );
const _projScreenMatrix$3 = /*@__PURE__*/ new Matrix4();
const _frustum$1 = /*@__PURE__*/ new Frustum();
const _box$1 = /*@__PURE__*/ new Box3();
const _sphere$2 = /*@__PURE__*/ new Sphere();
const _vector$5 = /*@__PURE__*/ new Vector3();
const _forward = /*@__PURE__*/ new Vector3();
const _temp = /*@__PURE__*/ new Vector3();
const _renderList = /*@__PURE__*/ new MultiDrawRenderList();
const _mesh = /*@__PURE__*/ new Mesh();
const _batchIntersects = [];

// @TODO: SkinnedMesh support?
// @TODO: geometry.groups support?
// @TODO: geometry.drawRange support?
// @TODO: geometry.morphAttributes support?
// @TODO: Support uniform parameter per geometry
// @TODO: Add an "optimize" function to pack geometry and remove data gaps

// copies data from attribute "src" into "target" starting at "targetOffset"
function copyAttributeData( src, target, targetOffset = 0 ) {

	const itemSize = target.itemSize;
	if ( src.isInterleavedBufferAttribute || src.array.constructor !== target.array.constructor ) {

		// use the component getters and setters if the array data cannot
		// be copied directly
		const vertexCount = src.count;
		for ( let i = 0; i < vertexCount; i ++ ) {

			for ( let c = 0; c < itemSize; c ++ ) {

				target.setComponent( i + targetOffset, c, src.getComponent( i, c ) );

			}

		}

	} else {

		// faster copy approach using typed array set function
		target.array.set( src.array, targetOffset * itemSize );

	}

	target.needsUpdate = true;

}

class BatchedMesh extends Mesh {

	get maxInstanceCount() {

		return this._maxInstanceCount;

	}

	constructor( maxInstanceCount, maxVertexCount, maxIndexCount = maxVertexCount * 2, material ) {

		super( new BufferGeometry(), material );

		this.isBatchedMesh = true;
		this.perObjectFrustumCulled = true;
		this.sortObjects = true;
		this.boundingBox = null;
		this.boundingSphere = null;
		this.customSort = null;

		// stores visible, active, and geometry id per object
		this._drawInfo = [];

		// geometry information
		this._drawRanges = [];
		this._reservedRanges = [];
		this._bounds = [];

		this._maxInstanceCount = maxInstanceCount;
		this._maxVertexCount = maxVertexCount;
		this._maxIndexCount = maxIndexCount;

		this._geometryInitialized = false;
		this._geometryCount = 0;
		this._multiDrawCounts = new Int32Array( maxInstanceCount );
		this._multiDrawStarts = new Int32Array( maxInstanceCount );
		this._multiDrawCount = 0;
		this._multiDrawInstances = null;
		this._visibilityChanged = true;

		// Local matrix per geometry by using data texture
		this._matricesTexture = null;
		this._indirectTexture = null;
		this._colorsTexture = null;

		this._initMatricesTexture();
		this._initIndirectTexture();

	}

	_initMatricesTexture() {

		// layout (1 matrix = 4 pixels)
		//      RGBA RGBA RGBA RGBA (=> column1, column2, column3, column4)
		//  with  8x8  pixel texture max   16 matrices * 4 pixels =  (8 * 8)
		//       16x16 pixel texture max   64 matrices * 4 pixels = (16 * 16)
		//       32x32 pixel texture max  256 matrices * 4 pixels = (32 * 32)
		//       64x64 pixel texture max 1024 matrices * 4 pixels = (64 * 64)

		let size = Math.sqrt( this._maxInstanceCount * 4 ); // 4 pixels needed for 1 matrix
		size = Math.ceil( size / 4 ) * 4;
		size = Math.max( size, 4 );

		const matricesArray = new Float32Array( size * size * 4 ); // 4 floats per RGBA pixel
		const matricesTexture = new DataTexture( matricesArray, size, size, RGBAFormat, FloatType );

		this._matricesTexture = matricesTexture;

	}

	_initIndirectTexture() {

		let size = Math.sqrt( this._maxInstanceCount );
		size = Math.ceil( size );

		const indirectArray = new Uint32Array( size * size );
		const indirectTexture = new DataTexture( indirectArray, size, size, RedIntegerFormat, UnsignedIntType );

		this._indirectTexture = indirectTexture;

	}

	_initColorsTexture() {

		let size = Math.sqrt( this._maxIndexCount );
		size = Math.ceil( size );

		// 4 floats per RGBA pixel initialized to white
		const colorsArray = new Float32Array( size * size * 4 ).fill( 1 );
		const colorsTexture = new DataTexture( colorsArray, size, size, RGBAFormat, FloatType );
		colorsTexture.colorSpace = ColorManagement.workingColorSpace;

		this._colorsTexture = colorsTexture;

	}

	_initializeGeometry( reference ) {

		const geometry = this.geometry;
		const maxVertexCount = this._maxVertexCount;
		const maxIndexCount = this._maxIndexCount;
		if ( this._geometryInitialized === false ) {

			for ( const attributeName in reference.attributes ) {

				const srcAttribute = reference.getAttribute( attributeName );
				const { array, itemSize, normalized } = srcAttribute;

				const dstArray = new array.constructor( maxVertexCount * itemSize );
				const dstAttribute = new BufferAttribute( dstArray, itemSize, normalized );

				geometry.setAttribute( attributeName, dstAttribute );

			}

			if ( reference.getIndex() !== null ) {

				// Reserve last u16 index for primitive restart.
				const indexArray = maxVertexCount > 65535
					? new Uint32Array( maxIndexCount )
					: new Uint16Array( maxIndexCount );

				geometry.setIndex( new BufferAttribute( indexArray, 1 ) );

			}

			this._geometryInitialized = true;

		}

	}

	// Make sure the geometry is compatible with the existing combined geometry attributes
	_validateGeometry( geometry ) {

		// check to ensure the geometries are using consistent attributes and indices
		const batchGeometry = this.geometry;
		if ( Boolean( geometry.getIndex() ) !== Boolean( batchGeometry.getIndex() ) ) {

			throw new Error( 'BatchedMesh: All geometries must consistently have "index".' );

		}

		for ( const attributeName in batchGeometry.attributes ) {

			if ( ! geometry.hasAttribute( attributeName ) ) {

				throw new Error( `BatchedMesh: Added geometry missing "${ attributeName }". All geometries must have consistent attributes.` );

			}

			const srcAttribute = geometry.getAttribute( attributeName );
			const dstAttribute = batchGeometry.getAttribute( attributeName );
			if ( srcAttribute.itemSize !== dstAttribute.itemSize || srcAttribute.normalized !== dstAttribute.normalized ) {

				throw new Error( 'BatchedMesh: All attributes must have a consistent itemSize and normalized value.' );

			}

		}

	}

	setCustomSort( func ) {

		this.customSort = func;
		return this;

	}

	computeBoundingBox() {

		if ( this.boundingBox === null ) {

			this.boundingBox = new Box3();

		}

		const geometryCount = this._geometryCount;
		const boundingBox = this.boundingBox;
		const drawInfo = this._drawInfo;

		boundingBox.makeEmpty();
		for ( let i = 0; i < geometryCount; i ++ ) {

			if ( drawInfo[ i ].active === false ) continue;

			const geometryId = drawInfo[ i ].geometryIndex;
			this.getMatrixAt( i, _matrix$1 );
			this.getBoundingBoxAt( geometryId, _box$1 ).applyMatrix4( _matrix$1 );
			boundingBox.union( _box$1 );

		}

	}

	computeBoundingSphere() {

		if ( this.boundingSphere === null ) {

			this.boundingSphere = new Sphere();

		}

		const boundingSphere = this.boundingSphere;
		const drawInfo = this._drawInfo;

		boundingSphere.makeEmpty();
		for ( let i = 0, l = drawInfo.length; i < l; i ++ ) {

			if ( drawInfo[ i ].active === false ) continue;

			const geometryId = drawInfo[ i ].geometryIndex;
			this.getMatrixAt( i, _matrix$1 );
			this.getBoundingSphereAt( geometryId, _sphere$2 ).applyMatrix4( _matrix$1 );
			boundingSphere.union( _sphere$2 );

		}

	}

	addInstance( geometryId ) {

		// ensure we're not over geometry
		if ( this._drawInfo.length >= this._maxInstanceCount ) {

			throw new Error( 'BatchedMesh: Maximum item count reached.' );

		}

		this._drawInfo.push( {

			visible: true,
			active: true,
			geometryIndex: geometryId,

		} );

		// initialize the matrix
		const drawId = this._drawInfo.length - 1;
		const matricesTexture = this._matricesTexture;
		const matricesArray = matricesTexture.image.data;
		_identityMatrix.toArray( matricesArray, drawId * 16 );
		matricesTexture.needsUpdate = true;

		const colorsTexture = this._colorsTexture;
		if ( colorsTexture ) {

			_whiteColor.toArray( colorsTexture.image.data, drawId * 4 );
			colorsTexture.needsUpdate = true;

		}

		return drawId;

	}

	addGeometry( geometry, vertexCount = - 1, indexCount = - 1 ) {

		this._initializeGeometry( geometry );

		this._validateGeometry( geometry );

		// ensure we're not over geometry
		if ( this._drawInfo.length >= this._maxInstanceCount ) {

			throw new Error( 'BatchedMesh: Maximum item count reached.' );

		}

		// get the necessary range fo the geometry
		const reservedRange = {
			vertexStart: - 1,
			vertexCount: - 1,
			indexStart: - 1,
			indexCount: - 1,
		};

		let lastRange = null;
		const reservedRanges = this._reservedRanges;
		const drawRanges = this._drawRanges;
		const bounds = this._bounds;
		if ( this._geometryCount !== 0 ) {

			lastRange = reservedRanges[ reservedRanges.length - 1 ];

		}

		if ( vertexCount === - 1 ) {

			reservedRange.vertexCount = geometry.getAttribute( 'position' ).count;

		} else {

			reservedRange.vertexCount = vertexCount;

		}

		if ( lastRange === null ) {

			reservedRange.vertexStart = 0;

		} else {

			reservedRange.vertexStart = lastRange.vertexStart + lastRange.vertexCount;

		}

		const index = geometry.getIndex();
		const hasIndex = index !== null;
		if ( hasIndex ) {

			if ( indexCount	=== - 1 ) {

				reservedRange.indexCount = index.count;

			} else {

				reservedRange.indexCount = indexCount;

			}

			if ( lastRange === null ) {

				reservedRange.indexStart = 0;

			} else {

				reservedRange.indexStart = lastRange.indexStart + lastRange.indexCount;

			}

		}

		if (
			reservedRange.indexStart !== - 1 &&
			reservedRange.indexStart + reservedRange.indexCount > this._maxIndexCount ||
			reservedRange.vertexStart + reservedRange.vertexCount > this._maxVertexCount
		) {

			throw new Error( 'BatchedMesh: Reserved space request exceeds the maximum buffer size.' );

		}

		// update id
		const geometryId = this._geometryCount;
		this._geometryCount ++;

		// add the reserved range and draw range objects
		reservedRanges.push( reservedRange );
		drawRanges.push( {
			start: hasIndex ? reservedRange.indexStart : reservedRange.vertexStart,
			count: - 1
		} );
		bounds.push( {
			boxInitialized: false,
			box: new Box3(),

			sphereInitialized: false,
			sphere: new Sphere()
		} );

		// update the geometry
		this.setGeometryAt( geometryId, geometry );

		return geometryId;

	}

	setGeometryAt( geometryId, geometry ) {

		if ( geometryId >= this._geometryCount ) {

			throw new Error( 'BatchedMesh: Maximum geometry count reached.' );

		}

		this._validateGeometry( geometry );

		const batchGeometry = this.geometry;
		const hasIndex = batchGeometry.getIndex() !== null;
		const dstIndex = batchGeometry.getIndex();
		const srcIndex = geometry.getIndex();
		const reservedRange = this._reservedRanges[ geometryId ];
		if (
			hasIndex &&
			srcIndex.count > reservedRange.indexCount ||
			geometry.attributes.position.count > reservedRange.vertexCount
		) {

			throw new Error( 'BatchedMesh: Reserved space not large enough for provided geometry.' );

		}

		// copy geometry over
		const vertexStart = reservedRange.vertexStart;
		const vertexCount = reservedRange.vertexCount;
		for ( const attributeName in batchGeometry.attributes ) {

			// copy attribute data
			const srcAttribute = geometry.getAttribute( attributeName );
			const dstAttribute = batchGeometry.getAttribute( attributeName );
			copyAttributeData( srcAttribute, dstAttribute, vertexStart );

			// fill the rest in with zeroes
			const itemSize = srcAttribute.itemSize;
			for ( let i = srcAttribute.count, l = vertexCount; i < l; i ++ ) {

				const index = vertexStart + i;
				for ( let c = 0; c < itemSize; c ++ ) {

					dstAttribute.setComponent( index, c, 0 );

				}

			}

			dstAttribute.needsUpdate = true;
			dstAttribute.addUpdateRange( vertexStart * itemSize, vertexCount * itemSize );

		}

		// copy index
		if ( hasIndex ) {

			const indexStart = reservedRange.indexStart;

			// copy index data over
			for ( let i = 0; i < srcIndex.count; i ++ ) {

				dstIndex.setX( indexStart + i, vertexStart + srcIndex.getX( i ) );

			}

			// fill the rest in with zeroes
			for ( let i = srcIndex.count, l = reservedRange.indexCount; i < l; i ++ ) {

				dstIndex.setX( indexStart + i, vertexStart );

			}

			dstIndex.needsUpdate = true;
			dstIndex.addUpdateRange( indexStart, reservedRange.indexCount );

		}

		// store the bounding boxes
		const bound = this._bounds[ geometryId ];
		if ( geometry.boundingBox !== null ) {

			bound.box.copy( geometry.boundingBox );
			bound.boxInitialized = true;

		} else {

			bound.boxInitialized = false;

		}

		if ( geometry.boundingSphere !== null ) {

			bound.sphere.copy( geometry.boundingSphere );
			bound.sphereInitialized = true;

		} else {

			bound.sphereInitialized = false;

		}

		// set drawRange count
		const drawRange = this._drawRanges[ geometryId ];
		const posAttr = geometry.getAttribute( 'position' );
		drawRange.count = hasIndex ? srcIndex.count : posAttr.count;
		this._visibilityChanged = true;

		return geometryId;

	}

	/*
	deleteGeometry( geometryId ) {

		// TODO: delete geometry and associated instances

	}
	*/

	/*
	deleteInstance( instanceId ) {

		// Note: User needs to call optimize() afterward to pack the data.

		const drawInfo = this._drawInfo;
		if ( instanceId >= drawInfo.length || drawInfo[ instanceId ].active === false ) {

			return this;

		}

		drawInfo[ instanceId ].active = false;
		this._visibilityChanged = true;

		return this;

	}
	*/

	// get bounding box and compute it if it doesn't exist
	getBoundingBoxAt( geometryId, target ) {

		if ( geometryId >= this._geometryCount ) {

			return null;

		}

		// compute bounding box
		const bound = this._bounds[ geometryId ];
		const box = bound.box;
		const geometry = this.geometry;
		if ( bound.boxInitialized === false ) {

			box.makeEmpty();

			const index = geometry.index;
			const position = geometry.attributes.position;
			const drawRange = this._drawRanges[ geometryId ];
			for ( let i = drawRange.start, l = drawRange.start + drawRange.count; i < l; i ++ ) {

				let iv = i;
				if ( index ) {

					iv = index.getX( iv );

				}

				box.expandByPoint( _vector$5.fromBufferAttribute( position, iv ) );

			}

			bound.boxInitialized = true;

		}

		target.copy( box );
		return target;

	}

	// get bounding sphere and compute it if it doesn't exist
	getBoundingSphereAt( geometryId, target ) {

		if ( geometryId >= this._geometryCount ) {

			return null;

		}

		// compute bounding sphere
		const bound = this._bounds[ geometryId ];
		const sphere = bound.sphere;
		const geometry = this.geometry;
		if ( bound.sphereInitialized === false ) {

			sphere.makeEmpty();

			this.getBoundingBoxAt( geometryId, _box$1 );
			_box$1.getCenter( sphere.center );

			const index = geometry.index;
			const position = geometry.attributes.position;
			const drawRange = this._drawRanges[ geometryId ];

			let maxRadiusSq = 0;
			for ( let i = drawRange.start, l = drawRange.start + drawRange.count; i < l; i ++ ) {

				let iv = i;
				if ( index ) {

					iv = index.getX( iv );

				}

				_vector$5.fromBufferAttribute( position, iv );
				maxRadiusSq = Math.max( maxRadiusSq, sphere.center.distanceToSquared( _vector$5 ) );

			}

			sphere.radius = Math.sqrt( maxRadiusSq );
			bound.sphereInitialized = true;

		}

		target.copy( sphere );
		return target;

	}

	setMatrixAt( instanceId, matrix ) {

		// @TODO: Map geometryId to index of the arrays because
		//        optimize() can make geometryId mismatch the index

		const drawInfo = this._drawInfo;
		const matricesTexture = this._matricesTexture;
		const matricesArray = this._matricesTexture.image.data;
		if ( instanceId >= drawInfo.length || drawInfo[ instanceId ].active === false ) {

			return this;

		}

		matrix.toArray( matricesArray, instanceId * 16 );
		matricesTexture.needsUpdate = true;

		return this;

	}

	getMatrixAt( instanceId, matrix ) {

		const drawInfo = this._drawInfo;
		const matricesArray = this._matricesTexture.image.data;
		if ( instanceId >= drawInfo.length || drawInfo[ instanceId ].active === false ) {

			return null;

		}

		return matrix.fromArray( matricesArray, instanceId * 16 );

	}

	setColorAt( instanceId, color ) {

		if ( this._colorsTexture === null ) {

			this._initColorsTexture();

		}

		// @TODO: Map id to index of the arrays because
		//        optimize() can make id mismatch the index

		const colorsTexture = this._colorsTexture;
		const colorsArray = this._colorsTexture.image.data;
		const drawInfo = this._drawInfo;
		if ( instanceId >= drawInfo.length || drawInfo[ instanceId ].active === false ) {

			return this;

		}

		color.toArray( colorsArray, instanceId * 4 );
		colorsTexture.needsUpdate = true;

		return this;

	}

	getColorAt( instanceId, color ) {

		const colorsArray = this._colorsTexture.image.data;
		const drawInfo = this._drawInfo;
		if ( instanceId >= drawInfo.length || drawInfo[ instanceId ].active === false ) {

			return null;

		}

		return color.fromArray( colorsArray, instanceId * 4 );

	}

	setVisibleAt( instanceId, value ) {

		// if the geometry is out of range, not active, or visibility state
		// does not change then return early
		const drawInfo = this._drawInfo;
		if (
			instanceId >= drawInfo.length ||
			drawInfo[ instanceId ].active === false ||
			drawInfo[ instanceId ].visible === value
		) {

			return this;

		}

		drawInfo[ instanceId ].visible = value;
		this._visibilityChanged = true;

		return this;

	}

	getVisibleAt( instanceId ) {

		// return early if the geometry is out of range or not active
		const drawInfo = this._drawInfo;
		if ( instanceId >= drawInfo.length || drawInfo[ instanceId ].active === false ) {

			return false;

		}

		return drawInfo[ instanceId ].visible;

	}

	raycast( raycaster, intersects ) {

		const drawInfo = this._drawInfo;
		const drawRanges = this._drawRanges;
		const matrixWorld = this.matrixWorld;
		const batchGeometry = this.geometry;

		// iterate over each geometry
		_mesh.material = this.material;
		_mesh.geometry.index = batchGeometry.index;
		_mesh.geometry.attributes = batchGeometry.attributes;
		if ( _mesh.geometry.boundingBox === null ) {

			_mesh.geometry.boundingBox = new Box3();

		}

		if ( _mesh.geometry.boundingSphere === null ) {

			_mesh.geometry.boundingSphere = new Sphere();

		}

		for ( let i = 0, l = drawInfo.length; i < l; i ++ ) {

			if ( ! drawInfo[ i ].visible || ! drawInfo[ i ].active ) {

				continue;

			}

			const geometryId = drawInfo[ i ].geometryIndex;
			const drawRange = drawRanges[ geometryId ];
			_mesh.geometry.setDrawRange( drawRange.start, drawRange.count );

			// ge the intersects
			this.getMatrixAt( i, _mesh.matrixWorld ).premultiply( matrixWorld );
			this.getBoundingBoxAt( geometryId, _mesh.geometry.boundingBox );
			this.getBoundingSphereAt( geometryId, _mesh.geometry.boundingSphere );
			_mesh.raycast( raycaster, _batchIntersects );

			// add batch id to the intersects
			for ( let j = 0, l = _batchIntersects.length; j < l; j ++ ) {

				const intersect = _batchIntersects[ j ];
				intersect.object = this;
				intersect.batchId = i;
				intersects.push( intersect );

			}

			_batchIntersects.length = 0;

		}

		_mesh.material = null;
		_mesh.geometry.index = null;
		_mesh.geometry.attributes = {};
		_mesh.geometry.setDrawRange( 0, Infinity );

	}

	copy( source ) {

		super.copy( source );

		this.geometry = source.geometry.clone();
		this.perObjectFrustumCulled = source.perObjectFrustumCulled;
		this.sortObjects = source.sortObjects;
		this.boundingBox = source.boundingBox !== null ? source.boundingBox.clone() : null;
		this.boundingSphere = source.boundingSphere !== null ? source.boundingSphere.clone() : null;

		this._drawRanges = source._drawRanges.map( range => ( { ...range } ) );
		this._reservedRanges = source._reservedRanges.map( range => ( { ...range } ) );

		this._drawInfo = source._drawInfo.map( inf => ( { ...inf } ) );
		this._bounds = source._bounds.map( bound => ( {
			boxInitialized: bound.boxInitialized,
			box: bound.box.clone(),

			sphereInitialized: bound.sphereInitialized,
			sphere: bound.sphere.clone()
		} ) );

		this._maxInstanceCount = source._maxInstanceCount;
		this._maxVertexCount = source._maxVertexCount;
		this._maxIndexCount = source._maxIndexCount;

		this._geometryInitialized = source._geometryInitialized;
		this._geometryCount = source._geometryCount;
		this._multiDrawCounts = source._multiDrawCounts.slice();
		this._multiDrawStarts = source._multiDrawStarts.slice();

		this._matricesTexture = source._matricesTexture.clone();
		this._matricesTexture.image.data = this._matricesTexture.image.data.slice();

		if ( this._colorsTexture !== null ) {

			this._colorsTexture = source._colorsTexture.clone();
			this._colorsTexture.image.data = this._colorsTexture.image.data.slice();

		}

		return this;

	}

	dispose() {

		// Assuming the geometry is not shared with other meshes
		this.geometry.dispose();

		this._matricesTexture.dispose();
		this._matricesTexture = null;

		this._indirectTexture.dispose();
		this._indirectTexture = null;

		if ( this._colorsTexture !== null ) {

			this._colorsTexture.dispose();
			this._colorsTexture = null;

		}

		return this;

	}

	onBeforeRender( renderer, scene, camera, geometry, material/*, _group*/ ) {

		// if visibility has not changed and frustum culling and object sorting is not required
		// then skip iterating over all items
		if ( ! this._visibilityChanged && ! this.perObjectFrustumCulled && ! this.sortObjects ) {

			return;

		}

		// the indexed version of the multi draw function requires specifying the start
		// offset in bytes.
		const index = geometry.getIndex();
		const bytesPerElement = index === null ? 1 : index.array.BYTES_PER_ELEMENT;

		const drawInfo = this._drawInfo;
		const multiDrawStarts = this._multiDrawStarts;
		const multiDrawCounts = this._multiDrawCounts;
		const drawRanges = this._drawRanges;
		const perObjectFrustumCulled = this.perObjectFrustumCulled;
		const indirectTexture = this._indirectTexture;
		const indirectArray = indirectTexture.image.data;

		// prepare the frustum in the local frame
		if ( perObjectFrustumCulled ) {

			_projScreenMatrix$3
				.multiplyMatrices( camera.projectionMatrix, camera.matrixWorldInverse )
				.multiply( this.matrixWorld );
			_frustum$1.setFromProjectionMatrix(
				_projScreenMatrix$3,
				renderer.coordinateSystem
			);

		}

		let count = 0;
		if ( this.sortObjects ) {

			// get the camera position in the local frame
			_invMatrixWorld.copy( this.matrixWorld ).invert();
			_vector$5.setFromMatrixPosition( camera.matrixWorld ).applyMatrix4( _invMatrixWorld );
			_forward.set( 0, 0, - 1 ).transformDirection( camera.matrixWorld ).transformDirection( _invMatrixWorld );

			for ( let i = 0, l = drawInfo.length; i < l; i ++ ) {

				if ( drawInfo[ i ].visible && drawInfo[ i ].active ) {

					const geometryId = drawInfo[ i ].geometryIndex;

					// get the bounds in world space
					this.getMatrixAt( i, _matrix$1 );
					this.getBoundingSphereAt( geometryId, _sphere$2 ).applyMatrix4( _matrix$1 );

					// determine whether the batched geometry is within the frustum
					let culled = false;
					if ( perObjectFrustumCulled ) {

						culled = ! _frustum$1.intersectsSphere( _sphere$2 );

					}

					if ( ! culled ) {

						// get the distance from camera used for sorting
						const z = _temp.subVectors( _sphere$2.center, _vector$5 ).dot( _forward );
						_renderList.push( drawRanges[ geometryId ], z, i );

					}

				}

			}

			// Sort the draw ranges and prep for rendering
			const list = _renderList.list;
			const customSort = this.customSort;
			if ( customSort === null ) {

				list.sort( material.transparent ? sortTransparent : sortOpaque );

			} else {

				customSort.call( this, list, camera );

			}

			for ( let i = 0, l = list.length; i < l; i ++ ) {

				const item = list[ i ];
				multiDrawStarts[ count ] = item.start * bytesPerElement;
				multiDrawCounts[ count ] = item.count;
				indirectArray[ count ] = item.index;
				count ++;

			}

			_renderList.reset();

		} else {

			for ( let i = 0, l = drawInfo.length; i < l; i ++ ) {

				if ( drawInfo[ i ].visible && drawInfo[ i ].active ) {

					const geometryId = drawInfo[ i ].geometryIndex;

					// determine whether the batched geometry is within the frustum
					let culled = false;
					if ( perObjectFrustumCulled ) {

						// get the bounds in world space
						this.getMatrixAt( i, _matrix$1 );
						this.getBoundingSphereAt( geometryId, _sphere$2 ).applyMatrix4( _matrix$1 );
						culled = ! _frustum$1.intersectsSphere( _sphere$2 );

					}

					if ( ! culled ) {

						const range = drawRanges[ geometryId ];
						multiDrawStarts[ count ] = range.start * bytesPerElement;
						multiDrawCounts[ count ] = range.count;
						indirectArray[ count ] = i;
						count ++;

					}

				}

			}

		}

		indirectTexture.needsUpdate = true;
		this._multiDrawCount = count;
		this._visibilityChanged = false;

	}

	onBeforeShadow( renderer, object, camera, shadowCamera, geometry, depthMaterial/* , group */ ) {

		this.onBeforeRender( renderer, null, shadowCamera, geometry, depthMaterial );

	}

}

class LineBasicMaterial extends Material {

	constructor( parameters ) {

		super();

		this.isLineBasicMaterial = true;

		this.type = 'LineBasicMaterial';

		this.color = new Color( 0xffffff );

		this.map = null;

		this.linewidth = 1;
		this.linecap = 'round';
		this.linejoin = 'round';

		this.fog = true;

		this.setValues( parameters );

	}


	copy( source ) {

		super.copy( source );

		this.color.copy( source.color );

		this.map = source.map;

		this.linewidth = source.linewidth;
		this.linecap = source.linecap;
		this.linejoin = source.linejoin;

		this.fog = source.fog;

		return this;

	}

}

const _vStart = /*@__PURE__*/ new Vector3();
const _vEnd = /*@__PURE__*/ new Vector3();

const _inverseMatrix$1 = /*@__PURE__*/ new Matrix4();
const _ray$1 = /*@__PURE__*/ new Ray();
const _sphere$1 = /*@__PURE__*/ new Sphere();

const _intersectPointOnRay = /*@__PURE__*/ new Vector3();
const _intersectPointOnSegment = /*@__PURE__*/ new Vector3();

class Line extends Object3D {

	constructor( geometry = new BufferGeometry(), material = new LineBasicMaterial() ) {

		super();

		this.isLine = true;

		this.type = 'Line';

		this.geometry = geometry;
		this.material = material;

		this.updateMorphTargets();

	}

	copy( source, recursive ) {

		super.copy( source, recursive );

		this.material = Array.isArray( source.material ) ? source.material.slice() : source.material;
		this.geometry = source.geometry;

		return this;

	}

	computeLineDistances() {

		const geometry = this.geometry;

		// we assume non-indexed geometry

		if ( geometry.index === null ) {

			const positionAttribute = geometry.attributes.position;
			const lineDistances = [ 0 ];

			for ( let i = 1, l = positionAttribute.count; i < l; i ++ ) {

				_vStart.fromBufferAttribute( positionAttribute, i - 1 );
				_vEnd.fromBufferAttribute( positionAttribute, i );

				lineDistances[ i ] = lineDistances[ i - 1 ];
				lineDistances[ i ] += _vStart.distanceTo( _vEnd );

			}

			geometry.setAttribute( 'lineDistance', new Float32BufferAttribute( lineDistances, 1 ) );

		} else {

			console.warn( 'THREE.Line.computeLineDistances(): Computation only possible with non-indexed BufferGeometry.' );

		}

		return this;

	}

	raycast( raycaster, intersects ) {

		const geometry = this.geometry;
		const matrixWorld = this.matrixWorld;
		const threshold = raycaster.params.Line.threshold;
		const drawRange = geometry.drawRange;

		// Checking boundingSphere distance to ray

		if ( geometry.boundingSphere === null ) geometry.computeBoundingSphere();

		_sphere$1.copy( geometry.boundingSphere );
		_sphere$1.applyMatrix4( matrixWorld );
		_sphere$1.radius += threshold;

		if ( raycaster.ray.intersectsSphere( _sphere$1 ) === false ) return;

		//

		_inverseMatrix$1.copy( matrixWorld ).invert();
		_ray$1.copy( raycaster.ray ).applyMatrix4( _inverseMatrix$1 );

		const localThreshold = threshold / ( ( this.scale.x + this.scale.y + this.scale.z ) / 3 );
		const localThresholdSq = localThreshold * localThreshold;

		const step = this.isLineSegments ? 2 : 1;

		const index = geometry.index;
		const attributes = geometry.attributes;
		const positionAttribute = attributes.position;

		if ( index !== null ) {

			const start = Math.max( 0, drawRange.start );
			const end = Math.min( index.count, ( drawRange.start + drawRange.count ) );

			for ( let i = start, l = end - 1; i < l; i += step ) {

				const a = index.getX( i );
				const b = index.getX( i + 1 );

				const intersect = checkIntersection( this, raycaster, _ray$1, localThresholdSq, a, b );

				if ( intersect ) {

					intersects.push( intersect );

				}

			}

			if ( this.isLineLoop ) {

				const a = index.getX( end - 1 );
				const b = index.getX( start );

				const intersect = checkIntersection( this, raycaster, _ray$1, localThresholdSq, a, b );

				if ( intersect ) {

					intersects.push( intersect );

				}

			}

		} else {

			const start = Math.max( 0, drawRange.start );
			const end = Math.min( positionAttribute.count, ( drawRange.start + drawRange.count ) );

			for ( let i = start, l = end - 1; i < l; i += step ) {

				const intersect = checkIntersection( this, raycaster, _ray$1, localThresholdSq, i, i + 1 );

				if ( intersect ) {

					intersects.push( intersect );

				}

			}

			if ( this.isLineLoop ) {

				const intersect = checkIntersection( this, raycaster, _ray$1, localThresholdSq, end - 1, start );

				if ( intersect ) {

					intersects.push( intersect );

				}

			}

		}

	}

	updateMorphTargets() {

		const geometry = this.geometry;

		const morphAttributes = geometry.morphAttributes;
		const keys = Object.keys( morphAttributes );

		if ( keys.length > 0 ) {

			const morphAttribute = morphAttributes[ keys[ 0 ] ];

			if ( morphAttribute !== undefined ) {

				this.morphTargetInfluences = [];
				this.morphTargetDictionary = {};

				for ( let m = 0, ml = morphAttribute.length; m < ml; m ++ ) {

					const name = morphAttribute[ m ].name || String( m );

					this.morphTargetInfluences.push( 0 );
					this.morphTargetDictionary[ name ] = m;

				}

			}

		}

	}

}

function checkIntersection( object, raycaster, ray, thresholdSq, a, b ) {

	const positionAttribute = object.geometry.attributes.position;

	_vStart.fromBufferAttribute( positionAttribute, a );
	_vEnd.fromBufferAttribute( positionAttribute, b );

	const distSq = ray.distanceSqToSegment( _vStart, _vEnd, _intersectPointOnRay, _intersectPointOnSegment );

	if ( distSq > thresholdSq ) return;

	_intersectPointOnRay.applyMatrix4( object.matrixWorld ); // Move back to world space for distance calculation

	const distance = raycaster.ray.origin.distanceTo( _intersectPointOnRay );

	if ( distance < raycaster.near || distance > raycaster.far ) return;

	return {

		distance: distance,
		// What do we want? intersection point on the ray or on the segment??
		// point: raycaster.ray.at( distance ),
		point: _intersectPointOnSegment.clone().applyMatrix4( object.matrixWorld ),
		index: a,
		face: null,
		faceIndex: null,
		object: object

	};

}

const _start = /*@__PURE__*/ new Vector3();
const _end = /*@__PURE__*/ new Vector3();

class LineSegments extends Line {

	constructor( geometry, material ) {

		super( geometry, material );

		this.isLineSegments = true;

		this.type = 'LineSegments';

	}

	computeLineDistances() {

		const geometry = this.geometry;

		// we assume non-indexed geometry

		if ( geometry.index === null ) {

			const positionAttribute = geometry.attributes.position;
			const lineDistances = [];

			for ( let i = 0, l = positionAttribute.count; i < l; i += 2 ) {

				_start.fromBufferAttribute( positionAttribute, i );
				_end.fromBufferAttribute( positionAttribute, i + 1 );

				lineDistances[ i ] = ( i === 0 ) ? 0 : lineDistances[ i - 1 ];
				lineDistances[ i + 1 ] = lineDistances[ i ] + _start.distanceTo( _end );

			}

			geometry.setAttribute( 'lineDistance', new Float32BufferAttribute( lineDistances, 1 ) );

		} else {

			console.warn( 'THREE.LineSegments.computeLineDistances(): Computation only possible with non-indexed BufferGeometry.' );

		}

		return this;

	}

}

class LineLoop extends Line {

	constructor( geometry, material ) {

		super( geometry, material );

		this.isLineLoop = true;

		this.type = 'LineLoop';

	}

}

class PointsMaterial extends Material {

	constructor( parameters ) {

		super();

		this.isPointsMaterial = true;

		this.type = 'PointsMaterial';

		this.color = new Color( 0xffffff );

		this.map = null;

		this.alphaMap = null;

		this.size = 1;
		this.sizeAttenuation = true;

		this.fog = true;

		this.setValues( parameters );

	}

	copy( source ) {

		super.copy( source );

		this.color.copy( source.color );

		this.map = source.map;

		this.alphaMap = source.alphaMap;

		this.size = source.size;
		this.sizeAttenuation = source.sizeAttenuation;

		this.fog = source.fog;

		return this;

	}

}

const _inverseMatrix = /*@__PURE__*/ new Matrix4();
const _ray = /*@__PURE__*/ new Ray();
const _sphere = /*@__PURE__*/ new Sphere();
const _position$2 = /*@__PURE__*/ new Vector3();

class Points extends Object3D {

	constructor( geometry = new BufferGeometry(), material = new PointsMaterial() ) {

		super();

		this.isPoints = true;

		this.type = 'Points';

		this.geometry = geometry;
		this.material = material;

		this.updateMorphTargets();

	}

	copy( source, recursive ) {

		super.copy( source, recursive );

		this.material = Array.isArray( source.material ) ? source.material.slice() : source.material;
		this.geometry = source.geometry;

		return this;

	}

	raycast( raycaster, intersects ) {

		const geometry = this.geometry;
		const matrixWorld = this.matrixWorld;
		const threshold = raycaster.params.Points.threshold;
		const drawRange = geometry.drawRange;

		// Checking boundingSphere distance to ray

		if ( geometry.boundingSphere === null ) geometry.computeBoundingSphere();

		_sphere.copy( geometry.boundingSphere );
		_sphere.applyMatrix4( matrixWorld );
		_sphere.radius += threshold;

		if ( raycaster.ray.intersectsSphere( _sphere ) === false ) return;

		//

		_inverseMatrix.copy( matrixWorld ).invert();
		_ray.copy( raycaster.ray ).applyMatrix4( _inverseMatrix );

		const localThreshold = threshold / ( ( this.scale.x + this.scale.y + this.scale.z ) / 3 );
		const localThresholdSq = localThreshold * localThreshold;

		const index = geometry.index;
		const attributes = geometry.attributes;
		const positionAttribute = attributes.position;

		if ( index !== null ) {

			const start = Math.max( 0, drawRange.start );
			const end = Math.min( index.count, ( drawRange.start + drawRange.count ) );

			for ( let i = start, il = end; i < il; i ++ ) {

				const a = index.getX( i );

				_position$2.fromBufferAttribute( positionAttribute, a );

				testPoint( _position$2, a, localThresholdSq, matrixWorld, raycaster, intersects, this );

			}

		} else {

			const start = Math.max( 0, drawRange.start );
			const end = Math.min( positionAttribute.count, ( drawRange.start + drawRange.count ) );

			for ( let i = start, l = end; i < l; i ++ ) {

				_position$2.fromBufferAttribute( positionAttribute, i );

				testPoint( _position$2, i, localThresholdSq, matrixWorld, raycaster, intersects, this );

			}

		}

	}

	updateMorphTargets() {

		const geometry = this.geometry;

		const morphAttributes = geometry.morphAttributes;
		const keys = Object.keys( morphAttributes );

		if ( keys.length > 0 ) {

			const morphAttribute = morphAttributes[ keys[ 0 ] ];

			if ( morphAttribute !== undefined ) {

				this.morphTargetInfluences = [];
				this.morphTargetDictionary = {};

				for ( let m = 0, ml = morphAttribute.length; m < ml; m ++ ) {

					const name = morphAttribute[ m ].name || String( m );

					this.morphTargetInfluences.push( 0 );
					this.morphTargetDictionary[ name ] = m;

				}

			}

		}

	}

}

function testPoint( point, index, localThresholdSq, matrixWorld, raycaster, intersects, object ) {

	const rayPointDistanceSq = _ray.distanceSqToPoint( point );

	if ( rayPointDistanceSq < localThresholdSq ) {

		const intersectPoint = new Vector3();

		_ray.closestPointToPoint( point, intersectPoint );
		intersectPoint.applyMatrix4( matrixWorld );

		const distance = raycaster.ray.origin.distanceTo( intersectPoint );

		if ( distance < raycaster.near || distance > raycaster.far ) return;

		intersects.push( {

			distance: distance,
			distanceToRay: Math.sqrt( rayPointDistanceSq ),
			point: intersectPoint,
			index: index,
			face: null,
			object: object

		} );

	}

}

class Group extends Object3D {

	constructor() {

		super();

		this.isGroup = true;

		this.type = 'Group';

	}

}

class VideoTexture extends Texture {

	constructor( video, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy ) {

		super( video, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy );

		this.isVideoTexture = true;

		this.minFilter = minFilter !== undefined ? minFilter : LinearFilter;
		this.magFilter = magFilter !== undefined ? magFilter : LinearFilter;

		this.generateMipmaps = false;

		const scope = this;

		function updateVideo() {

			scope.needsUpdate = true;
			video.requestVideoFrameCallback( updateVideo );

		}

		if ( 'requestVideoFrameCallback' in video ) {

			video.requestVideoFrameCallback( updateVideo );

		}

	}

	clone() {

		return new this.constructor( this.image ).copy( this );

	}

	update() {

		const video = this.image;
		const hasVideoFrameCallback = 'requestVideoFrameCallback' in video;

		if ( hasVideoFrameCallback === false && video.readyState >= video.HAVE_CURRENT_DATA ) {

			this.needsUpdate = true;

		}

	}

}

class FramebufferTexture extends Texture {

	constructor( width, height ) {

		super( { width, height } );

		this.isFramebufferTexture = true;

		this.magFilter = NearestFilter;
		this.minFilter = NearestFilter;

		this.generateMipmaps = false;

		this.needsUpdate = true;

	}

}

class CompressedTexture extends Texture {

	constructor( mipmaps, width, height, format, type, mapping, wrapS, wrapT, magFilter, minFilter, anisotropy, colorSpace ) {

		super( null, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy, colorSpace );

		this.isCompressedTexture = true;

		this.image = { width: width, height: height };
		this.mipmaps = mipmaps;

		// no flipping for cube textures
		// (also flipping doesn't work for compressed textures )

		this.flipY = false;

		// can't generate mipmaps for compressed textures
		// mips must be embedded in DDS files

		this.generateMipmaps = false;

	}

}

class CompressedArrayTexture extends CompressedTexture {

	constructor( mipmaps, width, height, depth, format, type ) {

		super( mipmaps, width, height, format, type );

		this.isCompressedArrayTexture = true;
		this.image.depth = depth;
		this.wrapR = ClampToEdgeWrapping;

		this.layerUpdates = new Set();

	}

	addLayerUpdate( layerIndex ) {

		this.layerUpdates.add( layerIndex );

	}

	clearLayerUpdates() {

		this.layerUpdates.clear();

	}

}

class CompressedCubeTexture extends CompressedTexture {

	constructor( images, format, type ) {

		super( undefined, images[ 0 ].width, images[ 0 ].height, format, type, CubeReflectionMapping );

		this.isCompressedCubeTexture = true;
		this.isCubeTexture = true;

		this.image = images;

	}

}

class CanvasTexture extends Texture {

	constructor( canvas, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy ) {

		super( canvas, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy );

		this.isCanvasTexture = true;

		this.needsUpdate = true;

	}

}

class DepthTexture extends Texture {

	constructor( width, height, type, mapping, wrapS, wrapT, magFilter, minFilter, anisotropy, format = DepthFormat ) {

		if ( format !== DepthFormat && format !== DepthStencilFormat ) {

			throw new Error( 'DepthTexture format must be either THREE.DepthFormat or THREE.DepthStencilFormat' );

		}

		if ( type === undefined && format === DepthFormat ) type = UnsignedIntType;
		if ( type === undefined && format === DepthStencilFormat ) type = UnsignedInt248Type;

		super( null, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy );

		this.isDepthTexture = true;

		this.image = { width: width, height: height };

		this.magFilter = magFilter !== undefined ? magFilter : NearestFilter;
		this.minFilter = minFilter !== undefined ? minFilter : NearestFilter;

		this.flipY = false;
		this.generateMipmaps = false;

		this.compareFunction = null;

	}


	copy( source ) {

		super.copy( source );

		this.compareFunction = source.compareFunction;

		return this;

	}

	toJSON( meta ) {

		const data = super.toJSON( meta );

		if ( this.compareFunction !== null ) data.compareFunction = this.compareFunction;

		return data;

	}

}

/**
 * Extensible curve object.
 *
 * Some common of curve methods:
 * .getPoint( t, optionalTarget ), .getTangent( t, optionalTarget )
 * .getPointAt( u, optionalTarget ), .getTangentAt( u, optionalTarget )
 * .getPoints(), .getSpacedPoints()
 * .getLength()
 * .updateArcLengths()
 *
 * This following curves inherit from THREE.Curve:
 *
 * -- 2D curves --
 * THREE.ArcCurve
 * THREE.CubicBezierCurve
 * THREE.EllipseCurve
 * THREE.LineCurve
 * THREE.QuadraticBezierCurve
 * THREE.SplineCurve
 *
 * -- 3D curves --
 * THREE.CatmullRomCurve3
 * THREE.CubicBezierCurve3
 * THREE.LineCurve3
 * THREE.QuadraticBezierCurve3
 *
 * A series of curves can be represented as a THREE.CurvePath.
 *
 **/

class Curve {

	constructor() {

		this.type = 'Curve';

		this.arcLengthDivisions = 200;

	}

	// Virtual base class method to overwrite and implement in subclasses
	//	- t [0 .. 1]

	getPoint( /* t, optionalTarget */ ) {

		console.warn( 'THREE.Curve: .getPoint() not implemented.' );
		return null;

	}

	// Get point at relative position in curve according to arc length
	// - u [0 .. 1]

	getPointAt( u, optionalTarget ) {

		const t = this.getUtoTmapping( u );
		return this.getPoint( t, optionalTarget );

	}

	// Get sequence of points using getPoint( t )

	getPoints( divisions = 5 ) {

		const points = [];

		for ( let d = 0; d <= divisions; d ++ ) {

			points.push( this.getPoint( d / divisions ) );

		}

		return points;

	}

	// Get sequence of points using getPointAt( u )

	getSpacedPoints( divisions = 5 ) {

		const points = [];

		for ( let d = 0; d <= divisions; d ++ ) {

			points.push( this.getPointAt( d / divisions ) );

		}

		return points;

	}

	// Get total curve arc length

	getLength() {

		const lengths = this.getLengths();
		return lengths[ lengths.length - 1 ];

	}

	// Get list of cumulative segment lengths

	getLengths( divisions = this.arcLengthDivisions ) {

		if ( this.cacheArcLengths &&
			( this.cacheArcLengths.length === divisions + 1 ) &&
			! this.needsUpdate ) {

			return this.cacheArcLengths;

		}

		this.needsUpdate = false;

		const cache = [];
		let current, last = this.getPoint( 0 );
		let sum = 0;

		cache.push( 0 );

		for ( let p = 1; p <= divisions; p ++ ) {

			current = this.getPoint( p / divisions );
			sum += current.distanceTo( last );
			cache.push( sum );
			last = current;

		}

		this.cacheArcLengths = cache;

		return cache; // { sums: cache, sum: sum }; Sum is in the last element.

	}

	updateArcLengths() {

		this.needsUpdate = true;
		this.getLengths();

	}

	// Given u ( 0 .. 1 ), get a t to find p. This gives you points which are equidistant

	getUtoTmapping( u, distance ) {

		const arcLengths = this.getLengths();

		let i = 0;
		const il = arcLengths.length;

		let targetArcLength; // The targeted u distance value to get

		if ( distance ) {

			targetArcLength = distance;

		} else {

			targetArcLength = u * arcLengths[ il - 1 ];

		}

		// binary search for the index with largest value smaller than target u distance

		let low = 0, high = il - 1, comparison;

		while ( low <= high ) {

			i = Math.floor( low + ( high - low ) / 2 ); // less likely to overflow, though probably not issue here, JS doesn't really have integers, all numbers are floats

			comparison = arcLengths[ i ] - targetArcLength;

			if ( comparison < 0 ) {

				low = i + 1;

			} else if ( comparison > 0 ) {

				high = i - 1;

			} else {

				high = i;
				break;

				// DONE

			}

		}

		i = high;

		if ( arcLengths[ i ] === targetArcLength ) {

			return i / ( il - 1 );

		}

		// we could get finer grain at lengths, or use simple interpolation between two points

		const lengthBefore = arcLengths[ i ];
		const lengthAfter = arcLengths[ i + 1 ];

		const segmentLength = lengthAfter - lengthBefore;

		// determine where we are between the 'before' and 'after' points

		const segmentFraction = ( targetArcLength - lengthBefore ) / segmentLength;

		// add that fractional amount to t

		const t = ( i + segmentFraction ) / ( il - 1 );

		return t;

	}

	// Returns a unit vector tangent at t
	// In case any sub curve does not implement its tangent derivation,
	// 2 points a small delta apart will be used to find its gradient
	// which seems to give a reasonable approximation

	getTangent( t, optionalTarget ) {

		const delta = 0.0001;
		let t1 = t - delta;
		let t2 = t + delta;

		// Capping in case of danger

		if ( t1 < 0 ) t1 = 0;
		if ( t2 > 1 ) t2 = 1;

		const pt1 = this.getPoint( t1 );
		const pt2 = this.getPoint( t2 );

		const tangent = optionalTarget || ( ( pt1.isVector2 ) ? new Vector2() : new Vector3() );

		tangent.copy( pt2 ).sub( pt1 ).normalize();

		return tangent;

	}

	getTangentAt( u, optionalTarget ) {

		const t = this.getUtoTmapping( u );
		return this.getTangent( t, optionalTarget );

	}

	computeFrenetFrames( segments, closed ) {

		// see http://www.cs.indiana.edu/pub/techreports/TR425.pdf

		const normal = new Vector3();

		const tangents = [];
		const normals = [];
		const binormals = [];

		const vec = new Vector3();
		const mat = new Matrix4();

		// compute the tangent vectors for each segment on the curve

		for ( let i = 0; i <= segments; i ++ ) {

			const u = i / segments;

			tangents[ i ] = this.getTangentAt( u, new Vector3() );

		}

		// select an initial normal vector perpendicular to the first tangent vector,
		// and in the direction of the minimum tangent xyz component

		normals[ 0 ] = new Vector3();
		binormals[ 0 ] = new Vector3();
		let min = Number.MAX_VALUE;
		const tx = Math.abs( tangents[ 0 ].x );
		const ty = Math.abs( tangents[ 0 ].y );
		const tz = Math.abs( tangents[ 0 ].z );

		if ( tx <= min ) {

			min = tx;
			normal.set( 1, 0, 0 );

		}

		if ( ty <= min ) {

			min = ty;
			normal.set( 0, 1, 0 );

		}

		if ( tz <= min ) {

			normal.set( 0, 0, 1 );

		}

		vec.crossVectors( tangents[ 0 ], normal ).normalize();

		normals[ 0 ].crossVectors( tangents[ 0 ], vec );
		binormals[ 0 ].crossVectors( tangents[ 0 ], normals[ 0 ] );


		// compute the slowly-varying normal and binormal vectors for each segment on the curve

		for ( let i = 1; i <= segments; i ++ ) {

			normals[ i ] = normals[ i - 1 ].clone();

			binormals[ i ] = binormals[ i - 1 ].clone();

			vec.crossVectors( tangents[ i - 1 ], tangents[ i ] );

			if ( vec.length() > Number.EPSILON ) {

				vec.normalize();

				const theta = Math.acos( clamp$1( tangents[ i - 1 ].dot( tangents[ i ] ), - 1, 1 ) ); // clamp for floating pt errors

				normals[ i ].applyMatrix4( mat.makeRotationAxis( vec, theta ) );

			}

			binormals[ i ].crossVectors( tangents[ i ], normals[ i ] );

		}

		// if the curve is closed, postprocess the vectors so the first and last normal vectors are the same

		if ( closed === true ) {

			let theta = Math.acos( clamp$1( normals[ 0 ].dot( normals[ segments ] ), - 1, 1 ) );
			theta /= segments;

			if ( tangents[ 0 ].dot( vec.crossVectors( normals[ 0 ], normals[ segments ] ) ) > 0 ) {

				theta = - theta;

			}

			for ( let i = 1; i <= segments; i ++ ) {

				// twist a little...
				normals[ i ].applyMatrix4( mat.makeRotationAxis( tangents[ i ], theta * i ) );
				binormals[ i ].crossVectors( tangents[ i ], normals[ i ] );

			}

		}

		return {
			tangents: tangents,
			normals: normals,
			binormals: binormals
		};

	}

	clone() {

		return new this.constructor().copy( this );

	}

	copy( source ) {

		this.arcLengthDivisions = source.arcLengthDivisions;

		return this;

	}

	toJSON() {

		const data = {
			metadata: {
				version: 4.6,
				type: 'Curve',
				generator: 'Curve.toJSON'
			}
		};

		data.arcLengthDivisions = this.arcLengthDivisions;
		data.type = this.type;

		return data;

	}

	fromJSON( json ) {

		this.arcLengthDivisions = json.arcLengthDivisions;

		return this;

	}

}

class EllipseCurve extends Curve {

	constructor( aX = 0, aY = 0, xRadius = 1, yRadius = 1, aStartAngle = 0, aEndAngle = Math.PI * 2, aClockwise = false, aRotation = 0 ) {

		super();

		this.isEllipseCurve = true;

		this.type = 'EllipseCurve';

		this.aX = aX;
		this.aY = aY;

		this.xRadius = xRadius;
		this.yRadius = yRadius;

		this.aStartAngle = aStartAngle;
		this.aEndAngle = aEndAngle;

		this.aClockwise = aClockwise;

		this.aRotation = aRotation;

	}

	getPoint( t, optionalTarget = new Vector2() ) {

		const point = optionalTarget;

		const twoPi = Math.PI * 2;
		let deltaAngle = this.aEndAngle - this.aStartAngle;
		const samePoints = Math.abs( deltaAngle ) < Number.EPSILON;

		// ensures that deltaAngle is 0 .. 2 PI
		while ( deltaAngle < 0 ) deltaAngle += twoPi;
		while ( deltaAngle > twoPi ) deltaAngle -= twoPi;

		if ( deltaAngle < Number.EPSILON ) {

			if ( samePoints ) {

				deltaAngle = 0;

			} else {

				deltaAngle = twoPi;

			}

		}

		if ( this.aClockwise === true && ! samePoints ) {

			if ( deltaAngle === twoPi ) {

				deltaAngle = - twoPi;

			} else {

				deltaAngle = deltaAngle - twoPi;

			}

		}

		const angle = this.aStartAngle + t * deltaAngle;
		let x = this.aX + this.xRadius * Math.cos( angle );
		let y = this.aY + this.yRadius * Math.sin( angle );

		if ( this.aRotation !== 0 ) {

			const cos = Math.cos( this.aRotation );
			const sin = Math.sin( this.aRotation );

			const tx = x - this.aX;
			const ty = y - this.aY;

			// Rotate the point about the center of the ellipse.
			x = tx * cos - ty * sin + this.aX;
			y = tx * sin + ty * cos + this.aY;

		}

		return point.set( x, y );

	}

	copy( source ) {

		super.copy( source );

		this.aX = source.aX;
		this.aY = source.aY;

		this.xRadius = source.xRadius;
		this.yRadius = source.yRadius;

		this.aStartAngle = source.aStartAngle;
		this.aEndAngle = source.aEndAngle;

		this.aClockwise = source.aClockwise;

		this.aRotation = source.aRotation;

		return this;

	}

	toJSON() {

		const data = super.toJSON();

		data.aX = this.aX;
		data.aY = this.aY;

		data.xRadius = this.xRadius;
		data.yRadius = this.yRadius;

		data.aStartAngle = this.aStartAngle;
		data.aEndAngle = this.aEndAngle;

		data.aClockwise = this.aClockwise;

		data.aRotation = this.aRotation;

		return data;

	}

	fromJSON( json ) {

		super.fromJSON( json );

		this.aX = json.aX;
		this.aY = json.aY;

		this.xRadius = json.xRadius;
		this.yRadius = json.yRadius;

		this.aStartAngle = json.aStartAngle;
		this.aEndAngle = json.aEndAngle;

		this.aClockwise = json.aClockwise;

		this.aRotation = json.aRotation;

		return this;

	}

}

class ArcCurve extends EllipseCurve {

	constructor( aX, aY, aRadius, aStartAngle, aEndAngle, aClockwise ) {

		super( aX, aY, aRadius, aRadius, aStartAngle, aEndAngle, aClockwise );

		this.isArcCurve = true;

		this.type = 'ArcCurve';

	}

}

/**
 * Centripetal CatmullRom Curve - which is useful for avoiding
 * cusps and self-intersections in non-uniform catmull rom curves.
 * http://www.cemyuksel.com/research/catmullrom_param/catmullrom.pdf
 *
 * curve.type accepts centripetal(default), chordal and catmullrom
 * curve.tension is used for catmullrom which defaults to 0.5
 */


/*
Based on an optimized c++ solution in
 - http://stackoverflow.com/questions/9489736/catmull-rom-curve-with-no-cusps-and-no-self-intersections/
 - http://ideone.com/NoEbVM

This CubicPoly class could be used for reusing some variables and calculations,
but for three.js curve use, it could be possible inlined and flatten into a single function call
which can be placed in CurveUtils.
*/

function CubicPoly() {

	let c0 = 0, c1 = 0, c2 = 0, c3 = 0;

	/*
	 * Compute coefficients for a cubic polynomial
	 *   p(s) = c0 + c1*s + c2*s^2 + c3*s^3
	 * such that
	 *   p(0) = x0, p(1) = x1
	 *  and
	 *   p'(0) = t0, p'(1) = t1.
	 */
	function init( x0, x1, t0, t1 ) {

		c0 = x0;
		c1 = t0;
		c2 = - 3 * x0 + 3 * x1 - 2 * t0 - t1;
		c3 = 2 * x0 - 2 * x1 + t0 + t1;

	}

	return {

		initCatmullRom: function ( x0, x1, x2, x3, tension ) {

			init( x1, x2, tension * ( x2 - x0 ), tension * ( x3 - x1 ) );

		},

		initNonuniformCatmullRom: function ( x0, x1, x2, x3, dt0, dt1, dt2 ) {

			// compute tangents when parameterized in [t1,t2]
			let t1 = ( x1 - x0 ) / dt0 - ( x2 - x0 ) / ( dt0 + dt1 ) + ( x2 - x1 ) / dt1;
			let t2 = ( x2 - x1 ) / dt1 - ( x3 - x1 ) / ( dt1 + dt2 ) + ( x3 - x2 ) / dt2;

			// rescale tangents for parametrization in [0,1]
			t1 *= dt1;
			t2 *= dt1;

			init( x1, x2, t1, t2 );

		},

		calc: function ( t ) {

			const t2 = t * t;
			const t3 = t2 * t;
			return c0 + c1 * t + c2 * t2 + c3 * t3;

		}

	};

}

//

const tmp = /*@__PURE__*/ new Vector3();
const px = /*@__PURE__*/ new CubicPoly();
const py = /*@__PURE__*/ new CubicPoly();
const pz = /*@__PURE__*/ new CubicPoly();

class CatmullRomCurve3 extends Curve {

	constructor( points = [], closed = false, curveType = 'centripetal', tension = 0.5 ) {

		super();

		this.isCatmullRomCurve3 = true;

		this.type = 'CatmullRomCurve3';

		this.points = points;
		this.closed = closed;
		this.curveType = curveType;
		this.tension = tension;

	}

	getPoint( t, optionalTarget = new Vector3() ) {

		const point = optionalTarget;

		const points = this.points;
		const l = points.length;

		const p = ( l - ( this.closed ? 0 : 1 ) ) * t;
		let intPoint = Math.floor( p );
		let weight = p - intPoint;

		if ( this.closed ) {

			intPoint += intPoint > 0 ? 0 : ( Math.floor( Math.abs( intPoint ) / l ) + 1 ) * l;

		} else if ( weight === 0 && intPoint === l - 1 ) {

			intPoint = l - 2;
			weight = 1;

		}

		let p0, p3; // 4 points (p1 & p2 defined below)

		if ( this.closed || intPoint > 0 ) {

			p0 = points[ ( intPoint - 1 ) % l ];

		} else {

			// extrapolate first point
			tmp.subVectors( points[ 0 ], points[ 1 ] ).add( points[ 0 ] );
			p0 = tmp;

		}

		const p1 = points[ intPoint % l ];
		const p2 = points[ ( intPoint + 1 ) % l ];

		if ( this.closed || intPoint + 2 < l ) {

			p3 = points[ ( intPoint + 2 ) % l ];

		} else {

			// extrapolate last point
			tmp.subVectors( points[ l - 1 ], points[ l - 2 ] ).add( points[ l - 1 ] );
			p3 = tmp;

		}

		if ( this.curveType === 'centripetal' || this.curveType === 'chordal' ) {

			// init Centripetal / Chordal Catmull-Rom
			const pow = this.curveType === 'chordal' ? 0.5 : 0.25;
			let dt0 = Math.pow( p0.distanceToSquared( p1 ), pow );
			let dt1 = Math.pow( p1.distanceToSquared( p2 ), pow );
			let dt2 = Math.pow( p2.distanceToSquared( p3 ), pow );

			// safety check for repeated points
			if ( dt1 < 1e-4 ) dt1 = 1.0;
			if ( dt0 < 1e-4 ) dt0 = dt1;
			if ( dt2 < 1e-4 ) dt2 = dt1;

			px.initNonuniformCatmullRom( p0.x, p1.x, p2.x, p3.x, dt0, dt1, dt2 );
			py.initNonuniformCatmullRom( p0.y, p1.y, p2.y, p3.y, dt0, dt1, dt2 );
			pz.initNonuniformCatmullRom( p0.z, p1.z, p2.z, p3.z, dt0, dt1, dt2 );

		} else if ( this.curveType === 'catmullrom' ) {

			px.initCatmullRom( p0.x, p1.x, p2.x, p3.x, this.tension );
			py.initCatmullRom( p0.y, p1.y, p2.y, p3.y, this.tension );
			pz.initCatmullRom( p0.z, p1.z, p2.z, p3.z, this.tension );

		}

		point.set(
			px.calc( weight ),
			py.calc( weight ),
			pz.calc( weight )
		);

		return point;

	}

	copy( source ) {

		super.copy( source );

		this.points = [];

		for ( let i = 0, l = source.points.length; i < l; i ++ ) {

			const point = source.points[ i ];

			this.points.push( point.clone() );

		}

		this.closed = source.closed;
		this.curveType = source.curveType;
		this.tension = source.tension;

		return this;

	}

	toJSON() {

		const data = super.toJSON();

		data.points = [];

		for ( let i = 0, l = this.points.length; i < l; i ++ ) {

			const point = this.points[ i ];
			data.points.push( point.toArray() );

		}

		data.closed = this.closed;
		data.curveType = this.curveType;
		data.tension = this.tension;

		return data;

	}

	fromJSON( json ) {

		super.fromJSON( json );

		this.points = [];

		for ( let i = 0, l = json.points.length; i < l; i ++ ) {

			const point = json.points[ i ];
			this.points.push( new Vector3().fromArray( point ) );

		}

		this.closed = json.closed;
		this.curveType = json.curveType;
		this.tension = json.tension;

		return this;

	}

}

/**
 * Bezier Curves formulas obtained from
 * https://en.wikipedia.org/wiki/B%C3%A9zier_curve
 */

function CatmullRom( t, p0, p1, p2, p3 ) {

	const v0 = ( p2 - p0 ) * 0.5;
	const v1 = ( p3 - p1 ) * 0.5;
	const t2 = t * t;
	const t3 = t * t2;
	return ( 2 * p1 - 2 * p2 + v0 + v1 ) * t3 + ( - 3 * p1 + 3 * p2 - 2 * v0 - v1 ) * t2 + v0 * t + p1;

}

//

function QuadraticBezierP0( t, p ) {

	const k = 1 - t;
	return k * k * p;

}

function QuadraticBezierP1( t, p ) {

	return 2 * ( 1 - t ) * t * p;

}

function QuadraticBezierP2( t, p ) {

	return t * t * p;

}

function QuadraticBezier( t, p0, p1, p2 ) {

	return QuadraticBezierP0( t, p0 ) + QuadraticBezierP1( t, p1 ) +
		QuadraticBezierP2( t, p2 );

}

//

function CubicBezierP0( t, p ) {

	const k = 1 - t;
	return k * k * k * p;

}

function CubicBezierP1( t, p ) {

	const k = 1 - t;
	return 3 * k * k * t * p;

}

function CubicBezierP2( t, p ) {

	return 3 * ( 1 - t ) * t * t * p;

}

function CubicBezierP3( t, p ) {

	return t * t * t * p;

}

function CubicBezier( t, p0, p1, p2, p3 ) {

	return CubicBezierP0( t, p0 ) + CubicBezierP1( t, p1 ) + CubicBezierP2( t, p2 ) +
		CubicBezierP3( t, p3 );

}

class CubicBezierCurve extends Curve {

	constructor( v0 = new Vector2(), v1 = new Vector2(), v2 = new Vector2(), v3 = new Vector2() ) {

		super();

		this.isCubicBezierCurve = true;

		this.type = 'CubicBezierCurve';

		this.v0 = v0;
		this.v1 = v1;
		this.v2 = v2;
		this.v3 = v3;

	}

	getPoint( t, optionalTarget = new Vector2() ) {

		const point = optionalTarget;

		const v0 = this.v0, v1 = this.v1, v2 = this.v2, v3 = this.v3;

		point.set(
			CubicBezier( t, v0.x, v1.x, v2.x, v3.x ),
			CubicBezier( t, v0.y, v1.y, v2.y, v3.y )
		);

		return point;

	}

	copy( source ) {

		super.copy( source );

		this.v0.copy( source.v0 );
		this.v1.copy( source.v1 );
		this.v2.copy( source.v2 );
		this.v3.copy( source.v3 );

		return this;

	}

	toJSON() {

		const data = super.toJSON();

		data.v0 = this.v0.toArray();
		data.v1 = this.v1.toArray();
		data.v2 = this.v2.toArray();
		data.v3 = this.v3.toArray();

		return data;

	}

	fromJSON( json ) {

		super.fromJSON( json );

		this.v0.fromArray( json.v0 );
		this.v1.fromArray( json.v1 );
		this.v2.fromArray( json.v2 );
		this.v3.fromArray( json.v3 );

		return this;

	}

}

class CubicBezierCurve3 extends Curve {

	constructor( v0 = new Vector3(), v1 = new Vector3(), v2 = new Vector3(), v3 = new Vector3() ) {

		super();

		this.isCubicBezierCurve3 = true;

		this.type = 'CubicBezierCurve3';

		this.v0 = v0;
		this.v1 = v1;
		this.v2 = v2;
		this.v3 = v3;

	}

	getPoint( t, optionalTarget = new Vector3() ) {

		const point = optionalTarget;

		const v0 = this.v0, v1 = this.v1, v2 = this.v2, v3 = this.v3;

		point.set(
			CubicBezier( t, v0.x, v1.x, v2.x, v3.x ),
			CubicBezier( t, v0.y, v1.y, v2.y, v3.y ),
			CubicBezier( t, v0.z, v1.z, v2.z, v3.z )
		);

		return point;

	}

	copy( source ) {

		super.copy( source );

		this.v0.copy( source.v0 );
		this.v1.copy( source.v1 );
		this.v2.copy( source.v2 );
		this.v3.copy( source.v3 );

		return this;

	}

	toJSON() {

		const data = super.toJSON();

		data.v0 = this.v0.toArray();
		data.v1 = this.v1.toArray();
		data.v2 = this.v2.toArray();
		data.v3 = this.v3.toArray();

		return data;

	}

	fromJSON( json ) {

		super.fromJSON( json );

		this.v0.fromArray( json.v0 );
		this.v1.fromArray( json.v1 );
		this.v2.fromArray( json.v2 );
		this.v3.fromArray( json.v3 );

		return this;

	}

}

class LineCurve extends Curve {

	constructor( v1 = new Vector2(), v2 = new Vector2() ) {

		super();

		this.isLineCurve = true;

		this.type = 'LineCurve';

		this.v1 = v1;
		this.v2 = v2;

	}

	getPoint( t, optionalTarget = new Vector2() ) {

		const point = optionalTarget;

		if ( t === 1 ) {

			point.copy( this.v2 );

		} else {

			point.copy( this.v2 ).sub( this.v1 );
			point.multiplyScalar( t ).add( this.v1 );

		}

		return point;

	}

	// Line curve is linear, so we can overwrite default getPointAt
	getPointAt( u, optionalTarget ) {

		return this.getPoint( u, optionalTarget );

	}

	getTangent( t, optionalTarget = new Vector2() ) {

		return optionalTarget.subVectors( this.v2, this.v1 ).normalize();

	}

	getTangentAt( u, optionalTarget ) {

		return this.getTangent( u, optionalTarget );

	}

	copy( source ) {

		super.copy( source );

		this.v1.copy( source.v1 );
		this.v2.copy( source.v2 );

		return this;

	}

	toJSON() {

		const data = super.toJSON();

		data.v1 = this.v1.toArray();
		data.v2 = this.v2.toArray();

		return data;

	}

	fromJSON( json ) {

		super.fromJSON( json );

		this.v1.fromArray( json.v1 );
		this.v2.fromArray( json.v2 );

		return this;

	}

}

class LineCurve3 extends Curve {

	constructor( v1 = new Vector3(), v2 = new Vector3() ) {

		super();

		this.isLineCurve3 = true;

		this.type = 'LineCurve3';

		this.v1 = v1;
		this.v2 = v2;

	}

	getPoint( t, optionalTarget = new Vector3() ) {

		const point = optionalTarget;

		if ( t === 1 ) {

			point.copy( this.v2 );

		} else {

			point.copy( this.v2 ).sub( this.v1 );
			point.multiplyScalar( t ).add( this.v1 );

		}

		return point;

	}

	// Line curve is linear, so we can overwrite default getPointAt
	getPointAt( u, optionalTarget ) {

		return this.getPoint( u, optionalTarget );

	}

	getTangent( t, optionalTarget = new Vector3() ) {

		return optionalTarget.subVectors( this.v2, this.v1 ).normalize();

	}

	getTangentAt( u, optionalTarget ) {

		return this.getTangent( u, optionalTarget );

	}

	copy( source ) {

		super.copy( source );

		this.v1.copy( source.v1 );
		this.v2.copy( source.v2 );

		return this;

	}

	toJSON() {

		const data = super.toJSON();

		data.v1 = this.v1.toArray();
		data.v2 = this.v2.toArray();

		return data;

	}

	fromJSON( json ) {

		super.fromJSON( json );

		this.v1.fromArray( json.v1 );
		this.v2.fromArray( json.v2 );

		return this;

	}

}

class QuadraticBezierCurve extends Curve {

	constructor( v0 = new Vector2(), v1 = new Vector2(), v2 = new Vector2() ) {

		super();

		this.isQuadraticBezierCurve = true;

		this.type = 'QuadraticBezierCurve';

		this.v0 = v0;
		this.v1 = v1;
		this.v2 = v2;

	}

	getPoint( t, optionalTarget = new Vector2() ) {

		const point = optionalTarget;

		const v0 = this.v0, v1 = this.v1, v2 = this.v2;

		point.set(
			QuadraticBezier( t, v0.x, v1.x, v2.x ),
			QuadraticBezier( t, v0.y, v1.y, v2.y )
		);

		return point;

	}

	copy( source ) {

		super.copy( source );

		this.v0.copy( source.v0 );
		this.v1.copy( source.v1 );
		this.v2.copy( source.v2 );

		return this;

	}

	toJSON() {

		const data = super.toJSON();

		data.v0 = this.v0.toArray();
		data.v1 = this.v1.toArray();
		data.v2 = this.v2.toArray();

		return data;

	}

	fromJSON( json ) {

		super.fromJSON( json );

		this.v0.fromArray( json.v0 );
		this.v1.fromArray( json.v1 );
		this.v2.fromArray( json.v2 );

		return this;

	}

}

class QuadraticBezierCurve3 extends Curve {

	constructor( v0 = new Vector3(), v1 = new Vector3(), v2 = new Vector3() ) {

		super();

		this.isQuadraticBezierCurve3 = true;

		this.type = 'QuadraticBezierCurve3';

		this.v0 = v0;
		this.v1 = v1;
		this.v2 = v2;

	}

	getPoint( t, optionalTarget = new Vector3() ) {

		const point = optionalTarget;

		const v0 = this.v0, v1 = this.v1, v2 = this.v2;

		point.set(
			QuadraticBezier( t, v0.x, v1.x, v2.x ),
			QuadraticBezier( t, v0.y, v1.y, v2.y ),
			QuadraticBezier( t, v0.z, v1.z, v2.z )
		);

		return point;

	}

	copy( source ) {

		super.copy( source );

		this.v0.copy( source.v0 );
		this.v1.copy( source.v1 );
		this.v2.copy( source.v2 );

		return this;

	}

	toJSON() {

		const data = super.toJSON();

		data.v0 = this.v0.toArray();
		data.v1 = this.v1.toArray();
		data.v2 = this.v2.toArray();

		return data;

	}

	fromJSON( json ) {

		super.fromJSON( json );

		this.v0.fromArray( json.v0 );
		this.v1.fromArray( json.v1 );
		this.v2.fromArray( json.v2 );

		return this;

	}

}

class SplineCurve extends Curve {

	constructor( points = [] ) {

		super();

		this.isSplineCurve = true;

		this.type = 'SplineCurve';

		this.points = points;

	}

	getPoint( t, optionalTarget = new Vector2() ) {

		const point = optionalTarget;

		const points = this.points;
		const p = ( points.length - 1 ) * t;

		const intPoint = Math.floor( p );
		const weight = p - intPoint;

		const p0 = points[ intPoint === 0 ? intPoint : intPoint - 1 ];
		const p1 = points[ intPoint ];
		const p2 = points[ intPoint > points.length - 2 ? points.length - 1 : intPoint + 1 ];
		const p3 = points[ intPoint > points.length - 3 ? points.length - 1 : intPoint + 2 ];

		point.set(
			CatmullRom( weight, p0.x, p1.x, p2.x, p3.x ),
			CatmullRom( weight, p0.y, p1.y, p2.y, p3.y )
		);

		return point;

	}

	copy( source ) {

		super.copy( source );

		this.points = [];

		for ( let i = 0, l = source.points.length; i < l; i ++ ) {

			const point = source.points[ i ];

			this.points.push( point.clone() );

		}

		return this;

	}

	toJSON() {

		const data = super.toJSON();

		data.points = [];

		for ( let i = 0, l = this.points.length; i < l; i ++ ) {

			const point = this.points[ i ];
			data.points.push( point.toArray() );

		}

		return data;

	}

	fromJSON( json ) {

		super.fromJSON( json );

		this.points = [];

		for ( let i = 0, l = json.points.length; i < l; i ++ ) {

			const point = json.points[ i ];
			this.points.push( new Vector2().fromArray( point ) );

		}

		return this;

	}

}

var Curves = /*#__PURE__*/Object.freeze({
	__proto__: null,
	ArcCurve: ArcCurve,
	CatmullRomCurve3: CatmullRomCurve3,
	CubicBezierCurve: CubicBezierCurve,
	CubicBezierCurve3: CubicBezierCurve3,
	EllipseCurve: EllipseCurve,
	LineCurve: LineCurve,
	LineCurve3: LineCurve3,
	QuadraticBezierCurve: QuadraticBezierCurve,
	QuadraticBezierCurve3: QuadraticBezierCurve3,
	SplineCurve: SplineCurve
});

/**************************************************************
 *	Curved Path - a curve path is simply a array of connected
 *  curves, but retains the api of a curve
 **************************************************************/

class CurvePath extends Curve {

	constructor() {

		super();

		this.type = 'CurvePath';

		this.curves = [];
		this.autoClose = false; // Automatically closes the path

	}

	add( curve ) {

		this.curves.push( curve );

	}

	closePath() {

		// Add a line curve if start and end of lines are not connected
		const startPoint = this.curves[ 0 ].getPoint( 0 );
		const endPoint = this.curves[ this.curves.length - 1 ].getPoint( 1 );

		if ( ! startPoint.equals( endPoint ) ) {

			const lineType = ( startPoint.isVector2 === true ) ? 'LineCurve' : 'LineCurve3';
			this.curves.push( new Curves[ lineType ]( endPoint, startPoint ) );

		}

		return this;

	}

	// To get accurate point with reference to
	// entire path distance at time t,
	// following has to be done:

	// 1. Length of each sub path have to be known
	// 2. Locate and identify type of curve
	// 3. Get t for the curve
	// 4. Return curve.getPointAt(t')

	getPoint( t, optionalTarget ) {

		const d = t * this.getLength();
		const curveLengths = this.getCurveLengths();
		let i = 0;

		// To think about boundaries points.

		while ( i < curveLengths.length ) {

			if ( curveLengths[ i ] >= d ) {

				const diff = curveLengths[ i ] - d;
				const curve = this.curves[ i ];

				const segmentLength = curve.getLength();
				const u = segmentLength === 0 ? 0 : 1 - diff / segmentLength;

				return curve.getPointAt( u, optionalTarget );

			}

			i ++;

		}

		return null;

		// loop where sum != 0, sum > d , sum+1 <d

	}

	// We cannot use the default THREE.Curve getPoint() with getLength() because in
	// THREE.Curve, getLength() depends on getPoint() but in THREE.CurvePath
	// getPoint() depends on getLength

	getLength() {

		const lens = this.getCurveLengths();
		return lens[ lens.length - 1 ];

	}

	// cacheLengths must be recalculated.
	updateArcLengths() {

		this.needsUpdate = true;
		this.cacheLengths = null;
		this.getCurveLengths();

	}

	// Compute lengths and cache them
	// We cannot overwrite getLengths() because UtoT mapping uses it.

	getCurveLengths() {

		// We use cache values if curves and cache array are same length

		if ( this.cacheLengths && this.cacheLengths.length === this.curves.length ) {

			return this.cacheLengths;

		}

		// Get length of sub-curve
		// Push sums into cached array

		const lengths = [];
		let sums = 0;

		for ( let i = 0, l = this.curves.length; i < l; i ++ ) {

			sums += this.curves[ i ].getLength();
			lengths.push( sums );

		}

		this.cacheLengths = lengths;

		return lengths;

	}

	getSpacedPoints( divisions = 40 ) {

		const points = [];

		for ( let i = 0; i <= divisions; i ++ ) {

			points.push( this.getPoint( i / divisions ) );

		}

		if ( this.autoClose ) {

			points.push( points[ 0 ] );

		}

		return points;

	}

	getPoints( divisions = 12 ) {

		const points = [];
		let last;

		for ( let i = 0, curves = this.curves; i < curves.length; i ++ ) {

			const curve = curves[ i ];
			const resolution = curve.isEllipseCurve ? divisions * 2
				: ( curve.isLineCurve || curve.isLineCurve3 ) ? 1
					: curve.isSplineCurve ? divisions * curve.points.length
						: divisions;

			const pts = curve.getPoints( resolution );

			for ( let j = 0; j < pts.length; j ++ ) {

				const point = pts[ j ];

				if ( last && last.equals( point ) ) continue; // ensures no consecutive points are duplicates

				points.push( point );
				last = point;

			}

		}

		if ( this.autoClose && points.length > 1 && ! points[ points.length - 1 ].equals( points[ 0 ] ) ) {

			points.push( points[ 0 ] );

		}

		return points;

	}

	copy( source ) {

		super.copy( source );

		this.curves = [];

		for ( let i = 0, l = source.curves.length; i < l; i ++ ) {

			const curve = source.curves[ i ];

			this.curves.push( curve.clone() );

		}

		this.autoClose = source.autoClose;

		return this;

	}

	toJSON() {

		const data = super.toJSON();

		data.autoClose = this.autoClose;
		data.curves = [];

		for ( let i = 0, l = this.curves.length; i < l; i ++ ) {

			const curve = this.curves[ i ];
			data.curves.push( curve.toJSON() );

		}

		return data;

	}

	fromJSON( json ) {

		super.fromJSON( json );

		this.autoClose = json.autoClose;
		this.curves = [];

		for ( let i = 0, l = json.curves.length; i < l; i ++ ) {

			const curve = json.curves[ i ];
			this.curves.push( new Curves[ curve.type ]().fromJSON( curve ) );

		}

		return this;

	}

}

class Path extends CurvePath {

	constructor( points ) {

		super();

		this.type = 'Path';

		this.currentPoint = new Vector2();

		if ( points ) {

			this.setFromPoints( points );

		}

	}

	setFromPoints( points ) {

		this.moveTo( points[ 0 ].x, points[ 0 ].y );

		for ( let i = 1, l = points.length; i < l; i ++ ) {

			this.lineTo( points[ i ].x, points[ i ].y );

		}

		return this;

	}

	moveTo( x, y ) {

		this.currentPoint.set( x, y ); // TODO consider referencing vectors instead of copying?

		return this;

	}

	lineTo( x, y ) {

		const curve = new LineCurve( this.currentPoint.clone(), new Vector2( x, y ) );
		this.curves.push( curve );

		this.currentPoint.set( x, y );

		return this;

	}

	quadraticCurveTo( aCPx, aCPy, aX, aY ) {

		const curve = new QuadraticBezierCurve(
			this.currentPoint.clone(),
			new Vector2( aCPx, aCPy ),
			new Vector2( aX, aY )
		);

		this.curves.push( curve );

		this.currentPoint.set( aX, aY );

		return this;

	}

	bezierCurveTo( aCP1x, aCP1y, aCP2x, aCP2y, aX, aY ) {

		const curve = new CubicBezierCurve(
			this.currentPoint.clone(),
			new Vector2( aCP1x, aCP1y ),
			new Vector2( aCP2x, aCP2y ),
			new Vector2( aX, aY )
		);

		this.curves.push( curve );

		this.currentPoint.set( aX, aY );

		return this;

	}

	splineThru( pts /*Array of Vector*/ ) {

		const npts = [ this.currentPoint.clone() ].concat( pts );

		const curve = new SplineCurve( npts );
		this.curves.push( curve );

		this.currentPoint.copy( pts[ pts.length - 1 ] );

		return this;

	}

	arc( aX, aY, aRadius, aStartAngle, aEndAngle, aClockwise ) {

		const x0 = this.currentPoint.x;
		const y0 = this.currentPoint.y;

		this.absarc( aX + x0, aY + y0, aRadius,
			aStartAngle, aEndAngle, aClockwise );

		return this;

	}

	absarc( aX, aY, aRadius, aStartAngle, aEndAngle, aClockwise ) {

		this.absellipse( aX, aY, aRadius, aRadius, aStartAngle, aEndAngle, aClockwise );

		return this;

	}

	ellipse( aX, aY, xRadius, yRadius, aStartAngle, aEndAngle, aClockwise, aRotation ) {

		const x0 = this.currentPoint.x;
		const y0 = this.currentPoint.y;

		this.absellipse( aX + x0, aY + y0, xRadius, yRadius, aStartAngle, aEndAngle, aClockwise, aRotation );

		return this;

	}

	absellipse( aX, aY, xRadius, yRadius, aStartAngle, aEndAngle, aClockwise, aRotation ) {

		const curve = new EllipseCurve( aX, aY, xRadius, yRadius, aStartAngle, aEndAngle, aClockwise, aRotation );

		if ( this.curves.length > 0 ) {

			// if a previous curve is present, attempt to join
			const firstPoint = curve.getPoint( 0 );

			if ( ! firstPoint.equals( this.currentPoint ) ) {

				this.lineTo( firstPoint.x, firstPoint.y );

			}

		}

		this.curves.push( curve );

		const lastPoint = curve.getPoint( 1 );
		this.currentPoint.copy( lastPoint );

		return this;

	}

	copy( source ) {

		super.copy( source );

		this.currentPoint.copy( source.currentPoint );

		return this;

	}

	toJSON() {

		const data = super.toJSON();

		data.currentPoint = this.currentPoint.toArray();

		return data;

	}

	fromJSON( json ) {

		super.fromJSON( json );

		this.currentPoint.fromArray( json.currentPoint );

		return this;

	}

}

class LatheGeometry extends BufferGeometry {

	constructor( points = [ new Vector2( 0, - 0.5 ), new Vector2( 0.5, 0 ), new Vector2( 0, 0.5 ) ], segments = 12, phiStart = 0, phiLength = Math.PI * 2 ) {

		super();

		this.type = 'LatheGeometry';

		this.parameters = {
			points: points,
			segments: segments,
			phiStart: phiStart,
			phiLength: phiLength
		};

		segments = Math.floor( segments );

		// clamp phiLength so it's in range of [ 0, 2PI ]

		phiLength = clamp$1( phiLength, 0, Math.PI * 2 );

		// buffers

		const indices = [];
		const vertices = [];
		const uvs = [];
		const initNormals = [];
		const normals = [];

		// helper variables

		const inverseSegments = 1.0 / segments;
		const vertex = new Vector3();
		const uv = new Vector2();
		const normal = new Vector3();
		const curNormal = new Vector3();
		const prevNormal = new Vector3();
		let dx = 0;
		let dy = 0;

		// pre-compute normals for initial "meridian"

		for ( let j = 0; j <= ( points.length - 1 ); j ++ ) {

			switch ( j ) {

				case 0:				// special handling for 1st vertex on path

					dx = points[ j + 1 ].x - points[ j ].x;
					dy = points[ j + 1 ].y - points[ j ].y;

					normal.x = dy * 1.0;
					normal.y = - dx;
					normal.z = dy * 0.0;

					prevNormal.copy( normal );

					normal.normalize();

					initNormals.push( normal.x, normal.y, normal.z );

					break;

				case ( points.length - 1 ):	// special handling for last Vertex on path

					initNormals.push( prevNormal.x, prevNormal.y, prevNormal.z );

					break;

				default:			// default handling for all vertices in between

					dx = points[ j + 1 ].x - points[ j ].x;
					dy = points[ j + 1 ].y - points[ j ].y;

					normal.x = dy * 1.0;
					normal.y = - dx;
					normal.z = dy * 0.0;

					curNormal.copy( normal );

					normal.x += prevNormal.x;
					normal.y += prevNormal.y;
					normal.z += prevNormal.z;

					normal.normalize();

					initNormals.push( normal.x, normal.y, normal.z );

					prevNormal.copy( curNormal );

			}

		}

		// generate vertices, uvs and normals

		for ( let i = 0; i <= segments; i ++ ) {

			const phi = phiStart + i * inverseSegments * phiLength;

			const sin = Math.sin( phi );
			const cos = Math.cos( phi );

			for ( let j = 0; j <= ( points.length - 1 ); j ++ ) {

				// vertex

				vertex.x = points[ j ].x * sin;
				vertex.y = points[ j ].y;
				vertex.z = points[ j ].x * cos;

				vertices.push( vertex.x, vertex.y, vertex.z );

				// uv

				uv.x = i / segments;
				uv.y = j / ( points.length - 1 );

				uvs.push( uv.x, uv.y );

				// normal

				const x = initNormals[ 3 * j + 0 ] * sin;
				const y = initNormals[ 3 * j + 1 ];
				const z = initNormals[ 3 * j + 0 ] * cos;

				normals.push( x, y, z );

			}

		}

		// indices

		for ( let i = 0; i < segments; i ++ ) {

			for ( let j = 0; j < ( points.length - 1 ); j ++ ) {

				const base = j + i * points.length;

				const a = base;
				const b = base + points.length;
				const c = base + points.length + 1;
				const d = base + 1;

				// faces

				indices.push( a, b, d );
				indices.push( c, d, b );

			}

		}

		// build geometry

		this.setIndex( indices );
		this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
		this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );
		this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );

	}

	copy( source ) {

		super.copy( source );

		this.parameters = Object.assign( {}, source.parameters );

		return this;

	}

	static fromJSON( data ) {

		return new LatheGeometry( data.points, data.segments, data.phiStart, data.phiLength );

	}

}

class CapsuleGeometry extends LatheGeometry {

	constructor( radius = 1, length = 1, capSegments = 4, radialSegments = 8 ) {

		const path = new Path();
		path.absarc( 0, - length / 2, radius, Math.PI * 1.5, 0 );
		path.absarc( 0, length / 2, radius, 0, Math.PI * 0.5 );

		super( path.getPoints( capSegments ), radialSegments );

		this.type = 'CapsuleGeometry';

		this.parameters = {
			radius: radius,
			length: length,
			capSegments: capSegments,
			radialSegments: radialSegments,
		};

	}

	static fromJSON( data ) {

		return new CapsuleGeometry( data.radius, data.length, data.capSegments, data.radialSegments );

	}

}

class CircleGeometry extends BufferGeometry {

	constructor( radius = 1, segments = 32, thetaStart = 0, thetaLength = Math.PI * 2 ) {

		super();

		this.type = 'CircleGeometry';

		this.parameters = {
			radius: radius,
			segments: segments,
			thetaStart: thetaStart,
			thetaLength: thetaLength
		};

		segments = Math.max( 3, segments );

		// buffers

		const indices = [];
		const vertices = [];
		const normals = [];
		const uvs = [];

		// helper variables

		const vertex = new Vector3();
		const uv = new Vector2();

		// center point

		vertices.push( 0, 0, 0 );
		normals.push( 0, 0, 1 );
		uvs.push( 0.5, 0.5 );

		for ( let s = 0, i = 3; s <= segments; s ++, i += 3 ) {

			const segment = thetaStart + s / segments * thetaLength;

			// vertex

			vertex.x = radius * Math.cos( segment );
			vertex.y = radius * Math.sin( segment );

			vertices.push( vertex.x, vertex.y, vertex.z );

			// normal

			normals.push( 0, 0, 1 );

			// uvs

			uv.x = ( vertices[ i ] / radius + 1 ) / 2;
			uv.y = ( vertices[ i + 1 ] / radius + 1 ) / 2;

			uvs.push( uv.x, uv.y );

		}

		// indices

		for ( let i = 1; i <= segments; i ++ ) {

			indices.push( i, i + 1, 0 );

		}

		// build geometry

		this.setIndex( indices );
		this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
		this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );
		this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );

	}

	copy( source ) {

		super.copy( source );

		this.parameters = Object.assign( {}, source.parameters );

		return this;

	}

	static fromJSON( data ) {

		return new CircleGeometry( data.radius, data.segments, data.thetaStart, data.thetaLength );

	}

}

class CylinderGeometry extends BufferGeometry {

	constructor( radiusTop = 1, radiusBottom = 1, height = 1, radialSegments = 32, heightSegments = 1, openEnded = false, thetaStart = 0, thetaLength = Math.PI * 2 ) {

		super();

		this.type = 'CylinderGeometry';

		this.parameters = {
			radiusTop: radiusTop,
			radiusBottom: radiusBottom,
			height: height,
			radialSegments: radialSegments,
			heightSegments: heightSegments,
			openEnded: openEnded,
			thetaStart: thetaStart,
			thetaLength: thetaLength
		};

		const scope = this;

		radialSegments = Math.floor( radialSegments );
		heightSegments = Math.floor( heightSegments );

		// buffers

		const indices = [];
		const vertices = [];
		const normals = [];
		const uvs = [];

		// helper variables

		let index = 0;
		const indexArray = [];
		const halfHeight = height / 2;
		let groupStart = 0;

		// generate geometry

		generateTorso();

		if ( openEnded === false ) {

			if ( radiusTop > 0 ) generateCap( true );
			if ( radiusBottom > 0 ) generateCap( false );

		}

		// build geometry

		this.setIndex( indices );
		this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
		this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );
		this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );

		function generateTorso() {

			const normal = new Vector3();
			const vertex = new Vector3();

			let groupCount = 0;

			// this will be used to calculate the normal
			const slope = ( radiusBottom - radiusTop ) / height;

			// generate vertices, normals and uvs

			for ( let y = 0; y <= heightSegments; y ++ ) {

				const indexRow = [];

				const v = y / heightSegments;

				// calculate the radius of the current row

				const radius = v * ( radiusBottom - radiusTop ) + radiusTop;

				for ( let x = 0; x <= radialSegments; x ++ ) {

					const u = x / radialSegments;

					const theta = u * thetaLength + thetaStart;

					const sinTheta = Math.sin( theta );
					const cosTheta = Math.cos( theta );

					// vertex

					vertex.x = radius * sinTheta;
					vertex.y = - v * height + halfHeight;
					vertex.z = radius * cosTheta;
					vertices.push( vertex.x, vertex.y, vertex.z );

					// normal

					normal.set( sinTheta, slope, cosTheta ).normalize();
					normals.push( normal.x, normal.y, normal.z );

					// uv

					uvs.push( u, 1 - v );

					// save index of vertex in respective row

					indexRow.push( index ++ );

				}

				// now save vertices of the row in our index array

				indexArray.push( indexRow );

			}

			// generate indices

			for ( let x = 0; x < radialSegments; x ++ ) {

				for ( let y = 0; y < heightSegments; y ++ ) {

					// we use the index array to access the correct indices

					const a = indexArray[ y ][ x ];
					const b = indexArray[ y + 1 ][ x ];
					const c = indexArray[ y + 1 ][ x + 1 ];
					const d = indexArray[ y ][ x + 1 ];

					// faces

					indices.push( a, b, d );
					indices.push( b, c, d );

					// update group counter

					groupCount += 6;

				}

			}

			// add a group to the geometry. this will ensure multi material support

			scope.addGroup( groupStart, groupCount, 0 );

			// calculate new start value for groups

			groupStart += groupCount;

		}

		function generateCap( top ) {

			// save the index of the first center vertex
			const centerIndexStart = index;

			const uv = new Vector2();
			const vertex = new Vector3();

			let groupCount = 0;

			const radius = ( top === true ) ? radiusTop : radiusBottom;
			const sign = ( top === true ) ? 1 : - 1;

			// first we generate the center vertex data of the cap.
			// because the geometry needs one set of uvs per face,
			// we must generate a center vertex per face/segment

			for ( let x = 1; x <= radialSegments; x ++ ) {

				// vertex

				vertices.push( 0, halfHeight * sign, 0 );

				// normal

				normals.push( 0, sign, 0 );

				// uv

				uvs.push( 0.5, 0.5 );

				// increase index

				index ++;

			}

			// save the index of the last center vertex
			const centerIndexEnd = index;

			// now we generate the surrounding vertices, normals and uvs

			for ( let x = 0; x <= radialSegments; x ++ ) {

				const u = x / radialSegments;
				const theta = u * thetaLength + thetaStart;

				const cosTheta = Math.cos( theta );
				const sinTheta = Math.sin( theta );

				// vertex

				vertex.x = radius * sinTheta;
				vertex.y = halfHeight * sign;
				vertex.z = radius * cosTheta;
				vertices.push( vertex.x, vertex.y, vertex.z );

				// normal

				normals.push( 0, sign, 0 );

				// uv

				uv.x = ( cosTheta * 0.5 ) + 0.5;
				uv.y = ( sinTheta * 0.5 * sign ) + 0.5;
				uvs.push( uv.x, uv.y );

				// increase index

				index ++;

			}

			// generate indices

			for ( let x = 0; x < radialSegments; x ++ ) {

				const c = centerIndexStart + x;
				const i = centerIndexEnd + x;

				if ( top === true ) {

					// face top

					indices.push( i, i + 1, c );

				} else {

					// face bottom

					indices.push( i + 1, i, c );

				}

				groupCount += 3;

			}

			// add a group to the geometry. this will ensure multi material support

			scope.addGroup( groupStart, groupCount, top === true ? 1 : 2 );

			// calculate new start value for groups

			groupStart += groupCount;

		}

	}

	copy( source ) {

		super.copy( source );

		this.parameters = Object.assign( {}, source.parameters );

		return this;

	}

	static fromJSON( data ) {

		return new CylinderGeometry( data.radiusTop, data.radiusBottom, data.height, data.radialSegments, data.heightSegments, data.openEnded, data.thetaStart, data.thetaLength );

	}

}

class ConeGeometry extends CylinderGeometry {

	constructor( radius = 1, height = 1, radialSegments = 32, heightSegments = 1, openEnded = false, thetaStart = 0, thetaLength = Math.PI * 2 ) {

		super( 0, radius, height, radialSegments, heightSegments, openEnded, thetaStart, thetaLength );

		this.type = 'ConeGeometry';

		this.parameters = {
			radius: radius,
			height: height,
			radialSegments: radialSegments,
			heightSegments: heightSegments,
			openEnded: openEnded,
			thetaStart: thetaStart,
			thetaLength: thetaLength
		};

	}

	static fromJSON( data ) {

		return new ConeGeometry( data.radius, data.height, data.radialSegments, data.heightSegments, data.openEnded, data.thetaStart, data.thetaLength );

	}

}

class PolyhedronGeometry extends BufferGeometry {

	constructor( vertices = [], indices = [], radius = 1, detail = 0 ) {

		super();

		this.type = 'PolyhedronGeometry';

		this.parameters = {
			vertices: vertices,
			indices: indices,
			radius: radius,
			detail: detail
		};

		// default buffer data

		const vertexBuffer = [];
		const uvBuffer = [];

		// the subdivision creates the vertex buffer data

		subdivide( detail );

		// all vertices should lie on a conceptual sphere with a given radius

		applyRadius( radius );

		// finally, create the uv data

		generateUVs();

		// build non-indexed geometry

		this.setAttribute( 'position', new Float32BufferAttribute( vertexBuffer, 3 ) );
		this.setAttribute( 'normal', new Float32BufferAttribute( vertexBuffer.slice(), 3 ) );
		this.setAttribute( 'uv', new Float32BufferAttribute( uvBuffer, 2 ) );

		if ( detail === 0 ) {

			this.computeVertexNormals(); // flat normals

		} else {

			this.normalizeNormals(); // smooth normals

		}

		// helper functions

		function subdivide( detail ) {

			const a = new Vector3();
			const b = new Vector3();
			const c = new Vector3();

			// iterate over all faces and apply a subdivision with the given detail value

			for ( let i = 0; i < indices.length; i += 3 ) {

				// get the vertices of the face

				getVertexByIndex( indices[ i + 0 ], a );
				getVertexByIndex( indices[ i + 1 ], b );
				getVertexByIndex( indices[ i + 2 ], c );

				// perform subdivision

				subdivideFace( a, b, c, detail );

			}

		}

		function subdivideFace( a, b, c, detail ) {

			const cols = detail + 1;

			// we use this multidimensional array as a data structure for creating the subdivision

			const v = [];

			// construct all of the vertices for this subdivision

			for ( let i = 0; i <= cols; i ++ ) {

				v[ i ] = [];

				const aj = a.clone().lerp( c, i / cols );
				const bj = b.clone().lerp( c, i / cols );

				const rows = cols - i;

				for ( let j = 0; j <= rows; j ++ ) {

					if ( j === 0 && i === cols ) {

						v[ i ][ j ] = aj;

					} else {

						v[ i ][ j ] = aj.clone().lerp( bj, j / rows );

					}

				}

			}

			// construct all of the faces

			for ( let i = 0; i < cols; i ++ ) {

				for ( let j = 0; j < 2 * ( cols - i ) - 1; j ++ ) {

					const k = Math.floor( j / 2 );

					if ( j % 2 === 0 ) {

						pushVertex( v[ i ][ k + 1 ] );
						pushVertex( v[ i + 1 ][ k ] );
						pushVertex( v[ i ][ k ] );

					} else {

						pushVertex( v[ i ][ k + 1 ] );
						pushVertex( v[ i + 1 ][ k + 1 ] );
						pushVertex( v[ i + 1 ][ k ] );

					}

				}

			}

		}

		function applyRadius( radius ) {

			const vertex = new Vector3();

			// iterate over the entire buffer and apply the radius to each vertex

			for ( let i = 0; i < vertexBuffer.length; i += 3 ) {

				vertex.x = vertexBuffer[ i + 0 ];
				vertex.y = vertexBuffer[ i + 1 ];
				vertex.z = vertexBuffer[ i + 2 ];

				vertex.normalize().multiplyScalar( radius );

				vertexBuffer[ i + 0 ] = vertex.x;
				vertexBuffer[ i + 1 ] = vertex.y;
				vertexBuffer[ i + 2 ] = vertex.z;

			}

		}

		function generateUVs() {

			const vertex = new Vector3();

			for ( let i = 0; i < vertexBuffer.length; i += 3 ) {

				vertex.x = vertexBuffer[ i + 0 ];
				vertex.y = vertexBuffer[ i + 1 ];
				vertex.z = vertexBuffer[ i + 2 ];

				const u = azimuth( vertex ) / 2 / Math.PI + 0.5;
				const v = inclination( vertex ) / Math.PI + 0.5;
				uvBuffer.push( u, 1 - v );

			}

			correctUVs();

			correctSeam();

		}

		function correctSeam() {

			// handle case when face straddles the seam, see #3269

			for ( let i = 0; i < uvBuffer.length; i += 6 ) {

				// uv data of a single face

				const x0 = uvBuffer[ i + 0 ];
				const x1 = uvBuffer[ i + 2 ];
				const x2 = uvBuffer[ i + 4 ];

				const max = Math.max( x0, x1, x2 );
				const min = Math.min( x0, x1, x2 );

				// 0.9 is somewhat arbitrary

				if ( max > 0.9 && min < 0.1 ) {

					if ( x0 < 0.2 ) uvBuffer[ i + 0 ] += 1;
					if ( x1 < 0.2 ) uvBuffer[ i + 2 ] += 1;
					if ( x2 < 0.2 ) uvBuffer[ i + 4 ] += 1;

				}

			}

		}

		function pushVertex( vertex ) {

			vertexBuffer.push( vertex.x, vertex.y, vertex.z );

		}

		function getVertexByIndex( index, vertex ) {

			const stride = index * 3;

			vertex.x = vertices[ stride + 0 ];
			vertex.y = vertices[ stride + 1 ];
			vertex.z = vertices[ stride + 2 ];

		}

		function correctUVs() {

			const a = new Vector3();
			const b = new Vector3();
			const c = new Vector3();

			const centroid = new Vector3();

			const uvA = new Vector2();
			const uvB = new Vector2();
			const uvC = new Vector2();

			for ( let i = 0, j = 0; i < vertexBuffer.length; i += 9, j += 6 ) {

				a.set( vertexBuffer[ i + 0 ], vertexBuffer[ i + 1 ], vertexBuffer[ i + 2 ] );
				b.set( vertexBuffer[ i + 3 ], vertexBuffer[ i + 4 ], vertexBuffer[ i + 5 ] );
				c.set( vertexBuffer[ i + 6 ], vertexBuffer[ i + 7 ], vertexBuffer[ i + 8 ] );

				uvA.set( uvBuffer[ j + 0 ], uvBuffer[ j + 1 ] );
				uvB.set( uvBuffer[ j + 2 ], uvBuffer[ j + 3 ] );
				uvC.set( uvBuffer[ j + 4 ], uvBuffer[ j + 5 ] );

				centroid.copy( a ).add( b ).add( c ).divideScalar( 3 );

				const azi = azimuth( centroid );

				correctUV( uvA, j + 0, a, azi );
				correctUV( uvB, j + 2, b, azi );
				correctUV( uvC, j + 4, c, azi );

			}

		}

		function correctUV( uv, stride, vector, azimuth ) {

			if ( ( azimuth < 0 ) && ( uv.x === 1 ) ) {

				uvBuffer[ stride ] = uv.x - 1;

			}

			if ( ( vector.x === 0 ) && ( vector.z === 0 ) ) {

				uvBuffer[ stride ] = azimuth / 2 / Math.PI + 0.5;

			}

		}

		// Angle around the Y axis, counter-clockwise when looking from above.

		function azimuth( vector ) {

			return Math.atan2( vector.z, - vector.x );

		}


		// Angle above the XZ plane.

		function inclination( vector ) {

			return Math.atan2( - vector.y, Math.sqrt( ( vector.x * vector.x ) + ( vector.z * vector.z ) ) );

		}

	}

	copy( source ) {

		super.copy( source );

		this.parameters = Object.assign( {}, source.parameters );

		return this;

	}

	static fromJSON( data ) {

		return new PolyhedronGeometry( data.vertices, data.indices, data.radius, data.details );

	}

}

class DodecahedronGeometry extends PolyhedronGeometry {

	constructor( radius = 1, detail = 0 ) {

		const t = ( 1 + Math.sqrt( 5 ) ) / 2;
		const r = 1 / t;

		const vertices = [

			// (±1, ±1, ±1)
			- 1, - 1, - 1,	- 1, - 1, 1,
			- 1, 1, - 1, - 1, 1, 1,
			1, - 1, - 1, 1, - 1, 1,
			1, 1, - 1, 1, 1, 1,

			// (0, ±1/φ, ±φ)
			0, - r, - t, 0, - r, t,
			0, r, - t, 0, r, t,

			// (±1/φ, ±φ, 0)
			- r, - t, 0, - r, t, 0,
			r, - t, 0, r, t, 0,

			// (±φ, 0, ±1/φ)
			- t, 0, - r, t, 0, - r,
			- t, 0, r, t, 0, r
		];

		const indices = [
			3, 11, 7, 	3, 7, 15, 	3, 15, 13,
			7, 19, 17, 	7, 17, 6, 	7, 6, 15,
			17, 4, 8, 	17, 8, 10, 	17, 10, 6,
			8, 0, 16, 	8, 16, 2, 	8, 2, 10,
			0, 12, 1, 	0, 1, 18, 	0, 18, 16,
			6, 10, 2, 	6, 2, 13, 	6, 13, 15,
			2, 16, 18, 	2, 18, 3, 	2, 3, 13,
			18, 1, 9, 	18, 9, 11, 	18, 11, 3,
			4, 14, 12, 	4, 12, 0, 	4, 0, 8,
			11, 9, 5, 	11, 5, 19, 	11, 19, 7,
			19, 5, 14, 	19, 14, 4, 	19, 4, 17,
			1, 12, 14, 	1, 14, 5, 	1, 5, 9
		];

		super( vertices, indices, radius, detail );

		this.type = 'DodecahedronGeometry';

		this.parameters = {
			radius: radius,
			detail: detail
		};

	}

	static fromJSON( data ) {

		return new DodecahedronGeometry( data.radius, data.detail );

	}

}

const _v0 = /*@__PURE__*/ new Vector3();
const _v1$1 = /*@__PURE__*/ new Vector3();
const _normal$1 = /*@__PURE__*/ new Vector3();
const _triangle = /*@__PURE__*/ new Triangle();

class EdgesGeometry extends BufferGeometry {

	constructor( geometry = null, thresholdAngle = 1 ) {

		super();

		this.type = 'EdgesGeometry';

		this.parameters = {
			geometry: geometry,
			thresholdAngle: thresholdAngle
		};

		if ( geometry !== null ) {

			const precisionPoints = 4;
			const precision = Math.pow( 10, precisionPoints );
			const thresholdDot = Math.cos( DEG2RAD * thresholdAngle );

			const indexAttr = geometry.getIndex();
			const positionAttr = geometry.getAttribute( 'position' );
			const indexCount = indexAttr ? indexAttr.count : positionAttr.count;

			const indexArr = [ 0, 0, 0 ];
			const vertKeys = [ 'a', 'b', 'c' ];
			const hashes = new Array( 3 );

			const edgeData = {};
			const vertices = [];
			for ( let i = 0; i < indexCount; i += 3 ) {

				if ( indexAttr ) {

					indexArr[ 0 ] = indexAttr.getX( i );
					indexArr[ 1 ] = indexAttr.getX( i + 1 );
					indexArr[ 2 ] = indexAttr.getX( i + 2 );

				} else {

					indexArr[ 0 ] = i;
					indexArr[ 1 ] = i + 1;
					indexArr[ 2 ] = i + 2;

				}

				const { a, b, c } = _triangle;
				a.fromBufferAttribute( positionAttr, indexArr[ 0 ] );
				b.fromBufferAttribute( positionAttr, indexArr[ 1 ] );
				c.fromBufferAttribute( positionAttr, indexArr[ 2 ] );
				_triangle.getNormal( _normal$1 );

				// create hashes for the edge from the vertices
				hashes[ 0 ] = `${ Math.round( a.x * precision ) },${ Math.round( a.y * precision ) },${ Math.round( a.z * precision ) }`;
				hashes[ 1 ] = `${ Math.round( b.x * precision ) },${ Math.round( b.y * precision ) },${ Math.round( b.z * precision ) }`;
				hashes[ 2 ] = `${ Math.round( c.x * precision ) },${ Math.round( c.y * precision ) },${ Math.round( c.z * precision ) }`;

				// skip degenerate triangles
				if ( hashes[ 0 ] === hashes[ 1 ] || hashes[ 1 ] === hashes[ 2 ] || hashes[ 2 ] === hashes[ 0 ] ) {

					continue;

				}

				// iterate over every edge
				for ( let j = 0; j < 3; j ++ ) {

					// get the first and next vertex making up the edge
					const jNext = ( j + 1 ) % 3;
					const vecHash0 = hashes[ j ];
					const vecHash1 = hashes[ jNext ];
					const v0 = _triangle[ vertKeys[ j ] ];
					const v1 = _triangle[ vertKeys[ jNext ] ];

					const hash = `${ vecHash0 }_${ vecHash1 }`;
					const reverseHash = `${ vecHash1 }_${ vecHash0 }`;

					if ( reverseHash in edgeData && edgeData[ reverseHash ] ) {

						// if we found a sibling edge add it into the vertex array if
						// it meets the angle threshold and delete the edge from the map.
						if ( _normal$1.dot( edgeData[ reverseHash ].normal ) <= thresholdDot ) {

							vertices.push( v0.x, v0.y, v0.z );
							vertices.push( v1.x, v1.y, v1.z );

						}

						edgeData[ reverseHash ] = null;

					} else if ( ! ( hash in edgeData ) ) {

						// if we've already got an edge here then skip adding a new one
						edgeData[ hash ] = {

							index0: indexArr[ j ],
							index1: indexArr[ jNext ],
							normal: _normal$1.clone(),

						};

					}

				}

			}

			// iterate over all remaining, unmatched edges and add them to the vertex array
			for ( const key in edgeData ) {

				if ( edgeData[ key ] ) {

					const { index0, index1 } = edgeData[ key ];
					_v0.fromBufferAttribute( positionAttr, index0 );
					_v1$1.fromBufferAttribute( positionAttr, index1 );

					vertices.push( _v0.x, _v0.y, _v0.z );
					vertices.push( _v1$1.x, _v1$1.y, _v1$1.z );

				}

			}

			this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );

		}

	}

	copy( source ) {

		super.copy( source );

		this.parameters = Object.assign( {}, source.parameters );

		return this;

	}

}

class Shape extends Path {

	constructor( points ) {

		super( points );

		this.uuid = generateUUID();

		this.type = 'Shape';

		this.holes = [];

	}

	getPointsHoles( divisions ) {

		const holesPts = [];

		for ( let i = 0, l = this.holes.length; i < l; i ++ ) {

			holesPts[ i ] = this.holes[ i ].getPoints( divisions );

		}

		return holesPts;

	}

	// get points of shape and holes (keypoints based on segments parameter)

	extractPoints( divisions ) {

		return {

			shape: this.getPoints( divisions ),
			holes: this.getPointsHoles( divisions )

		};

	}

	copy( source ) {

		super.copy( source );

		this.holes = [];

		for ( let i = 0, l = source.holes.length; i < l; i ++ ) {

			const hole = source.holes[ i ];

			this.holes.push( hole.clone() );

		}

		return this;

	}

	toJSON() {

		const data = super.toJSON();

		data.uuid = this.uuid;
		data.holes = [];

		for ( let i = 0, l = this.holes.length; i < l; i ++ ) {

			const hole = this.holes[ i ];
			data.holes.push( hole.toJSON() );

		}

		return data;

	}

	fromJSON( json ) {

		super.fromJSON( json );

		this.uuid = json.uuid;
		this.holes = [];

		for ( let i = 0, l = json.holes.length; i < l; i ++ ) {

			const hole = json.holes[ i ];
			this.holes.push( new Path().fromJSON( hole ) );

		}

		return this;

	}

}

/**
 * Port from https://github.com/mapbox/earcut (v2.2.4)
 */

const Earcut = {

	triangulate: function ( data, holeIndices, dim = 2 ) {

		const hasHoles = holeIndices && holeIndices.length;
		const outerLen = hasHoles ? holeIndices[ 0 ] * dim : data.length;
		let outerNode = linkedList( data, 0, outerLen, dim, true );
		const triangles = [];

		if ( ! outerNode || outerNode.next === outerNode.prev ) return triangles;

		let minX, minY, maxX, maxY, x, y, invSize;

		if ( hasHoles ) outerNode = eliminateHoles( data, holeIndices, outerNode, dim );

		// if the shape is not too simple, we'll use z-order curve hash later; calculate polygon bbox
		if ( data.length > 80 * dim ) {

			minX = maxX = data[ 0 ];
			minY = maxY = data[ 1 ];

			for ( let i = dim; i < outerLen; i += dim ) {

				x = data[ i ];
				y = data[ i + 1 ];
				if ( x < minX ) minX = x;
				if ( y < minY ) minY = y;
				if ( x > maxX ) maxX = x;
				if ( y > maxY ) maxY = y;

			}

			// minX, minY and invSize are later used to transform coords into integers for z-order calculation
			invSize = Math.max( maxX - minX, maxY - minY );
			invSize = invSize !== 0 ? 32767 / invSize : 0;

		}

		earcutLinked( outerNode, triangles, dim, minX, minY, invSize, 0 );

		return triangles;

	}

};

// create a circular doubly linked list from polygon points in the specified winding order
function linkedList( data, start, end, dim, clockwise ) {

	let i, last;

	if ( clockwise === ( signedArea( data, start, end, dim ) > 0 ) ) {

		for ( i = start; i < end; i += dim ) last = insertNode( i, data[ i ], data[ i + 1 ], last );

	} else {

		for ( i = end - dim; i >= start; i -= dim ) last = insertNode( i, data[ i ], data[ i + 1 ], last );

	}

	if ( last && equals$1( last, last.next ) ) {

		removeNode( last );
		last = last.next;

	}

	return last;

}

// eliminate colinear or duplicate points
function filterPoints( start, end ) {

	if ( ! start ) return start;
	if ( ! end ) end = start;

	let p = start,
		again;
	do {

		again = false;

		if ( ! p.steiner && ( equals$1( p, p.next ) || area( p.prev, p, p.next ) === 0 ) ) {

			removeNode( p );
			p = end = p.prev;
			if ( p === p.next ) break;
			again = true;

		} else {

			p = p.next;

		}

	} while ( again || p !== end );

	return end;

}

// main ear slicing loop which triangulates a polygon (given as a linked list)
function earcutLinked( ear, triangles, dim, minX, minY, invSize, pass ) {

	if ( ! ear ) return;

	// interlink polygon nodes in z-order
	if ( ! pass && invSize ) indexCurve( ear, minX, minY, invSize );

	let stop = ear,
		prev, next;

	// iterate through ears, slicing them one by one
	while ( ear.prev !== ear.next ) {

		prev = ear.prev;
		next = ear.next;

		if ( invSize ? isEarHashed( ear, minX, minY, invSize ) : isEar( ear ) ) {

			// cut off the triangle
			triangles.push( prev.i / dim | 0 );
			triangles.push( ear.i / dim | 0 );
			triangles.push( next.i / dim | 0 );

			removeNode( ear );

			// skipping the next vertex leads to less sliver triangles
			ear = next.next;
			stop = next.next;

			continue;

		}

		ear = next;

		// if we looped through the whole remaining polygon and can't find any more ears
		if ( ear === stop ) {

			// try filtering points and slicing again
			if ( ! pass ) {

				earcutLinked( filterPoints( ear ), triangles, dim, minX, minY, invSize, 1 );

				// if this didn't work, try curing all small self-intersections locally

			} else if ( pass === 1 ) {

				ear = cureLocalIntersections( filterPoints( ear ), triangles, dim );
				earcutLinked( ear, triangles, dim, minX, minY, invSize, 2 );

				// as a last resort, try splitting the remaining polygon into two

			} else if ( pass === 2 ) {

				splitEarcut( ear, triangles, dim, minX, minY, invSize );

			}

			break;

		}

	}

}

// check whether a polygon node forms a valid ear with adjacent nodes
function isEar( ear ) {

	const a = ear.prev,
		b = ear,
		c = ear.next;

	if ( area( a, b, c ) >= 0 ) return false; // reflex, can't be an ear

	// now make sure we don't have other points inside the potential ear
	const ax = a.x, bx = b.x, cx = c.x, ay = a.y, by = b.y, cy = c.y;

	// triangle bbox; min & max are calculated like this for speed
	const x0 = ax < bx ? ( ax < cx ? ax : cx ) : ( bx < cx ? bx : cx ),
		y0 = ay < by ? ( ay < cy ? ay : cy ) : ( by < cy ? by : cy ),
		x1 = ax > bx ? ( ax > cx ? ax : cx ) : ( bx > cx ? bx : cx ),
		y1 = ay > by ? ( ay > cy ? ay : cy ) : ( by > cy ? by : cy );

	let p = c.next;
	while ( p !== a ) {

		if ( p.x >= x0 && p.x <= x1 && p.y >= y0 && p.y <= y1 &&
			pointInTriangle( ax, ay, bx, by, cx, cy, p.x, p.y ) &&
			area( p.prev, p, p.next ) >= 0 ) return false;
		p = p.next;

	}

	return true;

}

function isEarHashed( ear, minX, minY, invSize ) {

	const a = ear.prev,
		b = ear,
		c = ear.next;

	if ( area( a, b, c ) >= 0 ) return false; // reflex, can't be an ear

	const ax = a.x, bx = b.x, cx = c.x, ay = a.y, by = b.y, cy = c.y;

	// triangle bbox; min & max are calculated like this for speed
	const x0 = ax < bx ? ( ax < cx ? ax : cx ) : ( bx < cx ? bx : cx ),
		y0 = ay < by ? ( ay < cy ? ay : cy ) : ( by < cy ? by : cy ),
		x1 = ax > bx ? ( ax > cx ? ax : cx ) : ( bx > cx ? bx : cx ),
		y1 = ay > by ? ( ay > cy ? ay : cy ) : ( by > cy ? by : cy );

	// z-order range for the current triangle bbox;
	const minZ = zOrder( x0, y0, minX, minY, invSize ),
		maxZ = zOrder( x1, y1, minX, minY, invSize );

	let p = ear.prevZ,
		n = ear.nextZ;

	// look for points inside the triangle in both directions
	while ( p && p.z >= minZ && n && n.z <= maxZ ) {

		if ( p.x >= x0 && p.x <= x1 && p.y >= y0 && p.y <= y1 && p !== a && p !== c &&
			pointInTriangle( ax, ay, bx, by, cx, cy, p.x, p.y ) && area( p.prev, p, p.next ) >= 0 ) return false;
		p = p.prevZ;

		if ( n.x >= x0 && n.x <= x1 && n.y >= y0 && n.y <= y1 && n !== a && n !== c &&
			pointInTriangle( ax, ay, bx, by, cx, cy, n.x, n.y ) && area( n.prev, n, n.next ) >= 0 ) return false;
		n = n.nextZ;

	}

	// look for remaining points in decreasing z-order
	while ( p && p.z >= minZ ) {

		if ( p.x >= x0 && p.x <= x1 && p.y >= y0 && p.y <= y1 && p !== a && p !== c &&
			pointInTriangle( ax, ay, bx, by, cx, cy, p.x, p.y ) && area( p.prev, p, p.next ) >= 0 ) return false;
		p = p.prevZ;

	}

	// look for remaining points in increasing z-order
	while ( n && n.z <= maxZ ) {

		if ( n.x >= x0 && n.x <= x1 && n.y >= y0 && n.y <= y1 && n !== a && n !== c &&
			pointInTriangle( ax, ay, bx, by, cx, cy, n.x, n.y ) && area( n.prev, n, n.next ) >= 0 ) return false;
		n = n.nextZ;

	}

	return true;

}

// go through all polygon nodes and cure small local self-intersections
function cureLocalIntersections( start, triangles, dim ) {

	let p = start;
	do {

		const a = p.prev,
			b = p.next.next;

		if ( ! equals$1( a, b ) && intersects( a, p, p.next, b ) && locallyInside( a, b ) && locallyInside( b, a ) ) {

			triangles.push( a.i / dim | 0 );
			triangles.push( p.i / dim | 0 );
			triangles.push( b.i / dim | 0 );

			// remove two nodes involved
			removeNode( p );
			removeNode( p.next );

			p = start = b;

		}

		p = p.next;

	} while ( p !== start );

	return filterPoints( p );

}

// try splitting polygon into two and triangulate them independently
function splitEarcut( start, triangles, dim, minX, minY, invSize ) {

	// look for a valid diagonal that divides the polygon into two
	let a = start;
	do {

		let b = a.next.next;
		while ( b !== a.prev ) {

			if ( a.i !== b.i && isValidDiagonal( a, b ) ) {

				// split the polygon in two by the diagonal
				let c = splitPolygon( a, b );

				// filter colinear points around the cuts
				a = filterPoints( a, a.next );
				c = filterPoints( c, c.next );

				// run earcut on each half
				earcutLinked( a, triangles, dim, minX, minY, invSize, 0 );
				earcutLinked( c, triangles, dim, minX, minY, invSize, 0 );
				return;

			}

			b = b.next;

		}

		a = a.next;

	} while ( a !== start );

}

// link every hole into the outer loop, producing a single-ring polygon without holes
function eliminateHoles( data, holeIndices, outerNode, dim ) {

	const queue = [];
	let i, len, start, end, list;

	for ( i = 0, len = holeIndices.length; i < len; i ++ ) {

		start = holeIndices[ i ] * dim;
		end = i < len - 1 ? holeIndices[ i + 1 ] * dim : data.length;
		list = linkedList( data, start, end, dim, false );
		if ( list === list.next ) list.steiner = true;
		queue.push( getLeftmost( list ) );

	}

	queue.sort( compareX );

	// process holes from left to right
	for ( i = 0; i < queue.length; i ++ ) {

		outerNode = eliminateHole( queue[ i ], outerNode );

	}

	return outerNode;

}

function compareX( a, b ) {

	return a.x - b.x;

}

// find a bridge between vertices that connects hole with an outer ring and link it
function eliminateHole( hole, outerNode ) {

	const bridge = findHoleBridge( hole, outerNode );
	if ( ! bridge ) {

		return outerNode;

	}

	const bridgeReverse = splitPolygon( bridge, hole );

	// filter collinear points around the cuts
	filterPoints( bridgeReverse, bridgeReverse.next );
	return filterPoints( bridge, bridge.next );

}

// David Eberly's algorithm for finding a bridge between hole and outer polygon
function findHoleBridge( hole, outerNode ) {

	let p = outerNode,
		qx = - Infinity,
		m;

	const hx = hole.x, hy = hole.y;

	// find a segment intersected by a ray from the hole's leftmost point to the left;
	// segment's endpoint with lesser x will be potential connection point
	do {

		if ( hy <= p.y && hy >= p.next.y && p.next.y !== p.y ) {

			const x = p.x + ( hy - p.y ) * ( p.next.x - p.x ) / ( p.next.y - p.y );
			if ( x <= hx && x > qx ) {

				qx = x;
				m = p.x < p.next.x ? p : p.next;
				if ( x === hx ) return m; // hole touches outer segment; pick leftmost endpoint

			}

		}

		p = p.next;

	} while ( p !== outerNode );

	if ( ! m ) return null;

	// look for points inside the triangle of hole point, segment intersection and endpoint;
	// if there are no points found, we have a valid connection;
	// otherwise choose the point of the minimum angle with the ray as connection point

	const stop = m,
		mx = m.x,
		my = m.y;
	let tanMin = Infinity, tan;

	p = m;

	do {

		if ( hx >= p.x && p.x >= mx && hx !== p.x &&
				pointInTriangle( hy < my ? hx : qx, hy, mx, my, hy < my ? qx : hx, hy, p.x, p.y ) ) {

			tan = Math.abs( hy - p.y ) / ( hx - p.x ); // tangential

			if ( locallyInside( p, hole ) && ( tan < tanMin || ( tan === tanMin && ( p.x > m.x || ( p.x === m.x && sectorContainsSector( m, p ) ) ) ) ) ) {

				m = p;
				tanMin = tan;

			}

		}

		p = p.next;

	} while ( p !== stop );

	return m;

}

// whether sector in vertex m contains sector in vertex p in the same coordinates
function sectorContainsSector( m, p ) {

	return area( m.prev, m, p.prev ) < 0 && area( p.next, m, m.next ) < 0;

}

// interlink polygon nodes in z-order
function indexCurve( start, minX, minY, invSize ) {

	let p = start;
	do {

		if ( p.z === 0 ) p.z = zOrder( p.x, p.y, minX, minY, invSize );
		p.prevZ = p.prev;
		p.nextZ = p.next;
		p = p.next;

	} while ( p !== start );

	p.prevZ.nextZ = null;
	p.prevZ = null;

	sortLinked( p );

}

// Simon Tatham's linked list merge sort algorithm
// http://www.chiark.greenend.org.uk/~sgtatham/algorithms/listsort.html
function sortLinked( list ) {

	let i, p, q, e, tail, numMerges, pSize, qSize,
		inSize = 1;

	do {

		p = list;
		list = null;
		tail = null;
		numMerges = 0;

		while ( p ) {

			numMerges ++;
			q = p;
			pSize = 0;
			for ( i = 0; i < inSize; i ++ ) {

				pSize ++;
				q = q.nextZ;
				if ( ! q ) break;

			}

			qSize = inSize;

			while ( pSize > 0 || ( qSize > 0 && q ) ) {

				if ( pSize !== 0 && ( qSize === 0 || ! q || p.z <= q.z ) ) {

					e = p;
					p = p.nextZ;
					pSize --;

				} else {

					e = q;
					q = q.nextZ;
					qSize --;

				}

				if ( tail ) tail.nextZ = e;
				else list = e;

				e.prevZ = tail;
				tail = e;

			}

			p = q;

		}

		tail.nextZ = null;
		inSize *= 2;

	} while ( numMerges > 1 );

	return list;

}

// z-order of a point given coords and inverse of the longer side of data bbox
function zOrder( x, y, minX, minY, invSize ) {

	// coords are transformed into non-negative 15-bit integer range
	x = ( x - minX ) * invSize | 0;
	y = ( y - minY ) * invSize | 0;

	x = ( x | ( x << 8 ) ) & 0x00FF00FF;
	x = ( x | ( x << 4 ) ) & 0x0F0F0F0F;
	x = ( x | ( x << 2 ) ) & 0x33333333;
	x = ( x | ( x << 1 ) ) & 0x55555555;

	y = ( y | ( y << 8 ) ) & 0x00FF00FF;
	y = ( y | ( y << 4 ) ) & 0x0F0F0F0F;
	y = ( y | ( y << 2 ) ) & 0x33333333;
	y = ( y | ( y << 1 ) ) & 0x55555555;

	return x | ( y << 1 );

}

// find the leftmost node of a polygon ring
function getLeftmost( start ) {

	let p = start,
		leftmost = start;
	do {

		if ( p.x < leftmost.x || ( p.x === leftmost.x && p.y < leftmost.y ) ) leftmost = p;
		p = p.next;

	} while ( p !== start );

	return leftmost;

}

// check if a point lies within a convex triangle
function pointInTriangle( ax, ay, bx, by, cx, cy, px, py ) {

	return ( cx - px ) * ( ay - py ) >= ( ax - px ) * ( cy - py ) &&
           ( ax - px ) * ( by - py ) >= ( bx - px ) * ( ay - py ) &&
           ( bx - px ) * ( cy - py ) >= ( cx - px ) * ( by - py );

}

// check if a diagonal between two polygon nodes is valid (lies in polygon interior)
function isValidDiagonal( a, b ) {

	return a.next.i !== b.i && a.prev.i !== b.i && ! intersectsPolygon( a, b ) && // dones't intersect other edges
           ( locallyInside( a, b ) && locallyInside( b, a ) && middleInside( a, b ) && // locally visible
            ( area( a.prev, a, b.prev ) || area( a, b.prev, b ) ) || // does not create opposite-facing sectors
            equals$1( a, b ) && area( a.prev, a, a.next ) > 0 && area( b.prev, b, b.next ) > 0 ); // special zero-length case

}

// signed area of a triangle
function area( p, q, r ) {

	return ( q.y - p.y ) * ( r.x - q.x ) - ( q.x - p.x ) * ( r.y - q.y );

}

// check if two points are equal
function equals$1( p1, p2 ) {

	return p1.x === p2.x && p1.y === p2.y;

}

// check if two segments intersect
function intersects( p1, q1, p2, q2 ) {

	const o1 = sign$1( area( p1, q1, p2 ) );
	const o2 = sign$1( area( p1, q1, q2 ) );
	const o3 = sign$1( area( p2, q2, p1 ) );
	const o4 = sign$1( area( p2, q2, q1 ) );

	if ( o1 !== o2 && o3 !== o4 ) return true; // general case

	if ( o1 === 0 && onSegment( p1, p2, q1 ) ) return true; // p1, q1 and p2 are collinear and p2 lies on p1q1
	if ( o2 === 0 && onSegment( p1, q2, q1 ) ) return true; // p1, q1 and q2 are collinear and q2 lies on p1q1
	if ( o3 === 0 && onSegment( p2, p1, q2 ) ) return true; // p2, q2 and p1 are collinear and p1 lies on p2q2
	if ( o4 === 0 && onSegment( p2, q1, q2 ) ) return true; // p2, q2 and q1 are collinear and q1 lies on p2q2

	return false;

}

// for collinear points p, q, r, check if point q lies on segment pr
function onSegment( p, q, r ) {

	return q.x <= Math.max( p.x, r.x ) && q.x >= Math.min( p.x, r.x ) && q.y <= Math.max( p.y, r.y ) && q.y >= Math.min( p.y, r.y );

}

function sign$1( num ) {

	return num > 0 ? 1 : num < 0 ? - 1 : 0;

}

// check if a polygon diagonal intersects any polygon segments
function intersectsPolygon( a, b ) {

	let p = a;
	do {

		if ( p.i !== a.i && p.next.i !== a.i && p.i !== b.i && p.next.i !== b.i &&
			intersects( p, p.next, a, b ) ) return true;
		p = p.next;

	} while ( p !== a );

	return false;

}

// check if a polygon diagonal is locally inside the polygon
function locallyInside( a, b ) {

	return area( a.prev, a, a.next ) < 0 ?
		area( a, b, a.next ) >= 0 && area( a, a.prev, b ) >= 0 :
		area( a, b, a.prev ) < 0 || area( a, a.next, b ) < 0;

}

// check if the middle point of a polygon diagonal is inside the polygon
function middleInside( a, b ) {

	let p = a,
		inside = false;
	const px = ( a.x + b.x ) / 2,
		py = ( a.y + b.y ) / 2;
	do {

		if ( ( ( p.y > py ) !== ( p.next.y > py ) ) && p.next.y !== p.y &&
			( px < ( p.next.x - p.x ) * ( py - p.y ) / ( p.next.y - p.y ) + p.x ) )
			inside = ! inside;
		p = p.next;

	} while ( p !== a );

	return inside;

}

// link two polygon vertices with a bridge; if the vertices belong to the same ring, it splits polygon into two;
// if one belongs to the outer ring and another to a hole, it merges it into a single ring
function splitPolygon( a, b ) {

	const a2 = new Node$1( a.i, a.x, a.y ),
		b2 = new Node$1( b.i, b.x, b.y ),
		an = a.next,
		bp = b.prev;

	a.next = b;
	b.prev = a;

	a2.next = an;
	an.prev = a2;

	b2.next = a2;
	a2.prev = b2;

	bp.next = b2;
	b2.prev = bp;

	return b2;

}

// create a node and optionally link it with previous one (in a circular doubly linked list)
function insertNode( i, x, y, last ) {

	const p = new Node$1( i, x, y );

	if ( ! last ) {

		p.prev = p;
		p.next = p;

	} else {

		p.next = last.next;
		p.prev = last;
		last.next.prev = p;
		last.next = p;

	}

	return p;

}

function removeNode( p ) {

	p.next.prev = p.prev;
	p.prev.next = p.next;

	if ( p.prevZ ) p.prevZ.nextZ = p.nextZ;
	if ( p.nextZ ) p.nextZ.prevZ = p.prevZ;

}

function Node$1( i, x, y ) {

	// vertex index in coordinates array
	this.i = i;

	// vertex coordinates
	this.x = x;
	this.y = y;

	// previous and next vertex nodes in a polygon ring
	this.prev = null;
	this.next = null;

	// z-order curve value
	this.z = 0;

	// previous and next nodes in z-order
	this.prevZ = null;
	this.nextZ = null;

	// indicates whether this is a steiner point
	this.steiner = false;

}

function signedArea( data, start, end, dim ) {

	let sum = 0;
	for ( let i = start, j = end - dim; i < end; i += dim ) {

		sum += ( data[ j ] - data[ i ] ) * ( data[ i + 1 ] + data[ j + 1 ] );
		j = i;

	}

	return sum;

}

class ShapeUtils {

	// calculate area of the contour polygon

	static area( contour ) {

		const n = contour.length;
		let a = 0.0;

		for ( let p = n - 1, q = 0; q < n; p = q ++ ) {

			a += contour[ p ].x * contour[ q ].y - contour[ q ].x * contour[ p ].y;

		}

		return a * 0.5;

	}

	static isClockWise( pts ) {

		return ShapeUtils.area( pts ) < 0;

	}

	static triangulateShape( contour, holes ) {

		const vertices = []; // flat array of vertices like [ x0,y0, x1,y1, x2,y2, ... ]
		const holeIndices = []; // array of hole indices
		const faces = []; // final array of vertex indices like [ [ a,b,d ], [ b,c,d ] ]

		removeDupEndPts( contour );
		addContour( vertices, contour );

		//

		let holeIndex = contour.length;

		holes.forEach( removeDupEndPts );

		for ( let i = 0; i < holes.length; i ++ ) {

			holeIndices.push( holeIndex );
			holeIndex += holes[ i ].length;
			addContour( vertices, holes[ i ] );

		}

		//

		const triangles = Earcut.triangulate( vertices, holeIndices );

		//

		for ( let i = 0; i < triangles.length; i += 3 ) {

			faces.push( triangles.slice( i, i + 3 ) );

		}

		return faces;

	}

}

function removeDupEndPts( points ) {

	const l = points.length;

	if ( l > 2 && points[ l - 1 ].equals( points[ 0 ] ) ) {

		points.pop();

	}

}

function addContour( vertices, contour ) {

	for ( let i = 0; i < contour.length; i ++ ) {

		vertices.push( contour[ i ].x );
		vertices.push( contour[ i ].y );

	}

}

/**
 * Creates extruded geometry from a path shape.
 *
 * parameters = {
 *
 *  curveSegments: <int>, // number of points on the curves
 *  steps: <int>, // number of points for z-side extrusions / used for subdividing segments of extrude spline too
 *  depth: <float>, // Depth to extrude the shape
 *
 *  bevelEnabled: <bool>, // turn on bevel
 *  bevelThickness: <float>, // how deep into the original shape bevel goes
 *  bevelSize: <float>, // how far from shape outline (including bevelOffset) is bevel
 *  bevelOffset: <float>, // how far from shape outline does bevel start
 *  bevelSegments: <int>, // number of bevel layers
 *
 *  extrudePath: <THREE.Curve> // curve to extrude shape along
 *
 *  UVGenerator: <Object> // object that provides UV generator functions
 *
 * }
 */


class ExtrudeGeometry extends BufferGeometry {

	constructor( shapes = new Shape( [ new Vector2( 0.5, 0.5 ), new Vector2( - 0.5, 0.5 ), new Vector2( - 0.5, - 0.5 ), new Vector2( 0.5, - 0.5 ) ] ), options = {} ) {

		super();

		this.type = 'ExtrudeGeometry';

		this.parameters = {
			shapes: shapes,
			options: options
		};

		shapes = Array.isArray( shapes ) ? shapes : [ shapes ];

		const scope = this;

		const verticesArray = [];
		const uvArray = [];

		for ( let i = 0, l = shapes.length; i < l; i ++ ) {

			const shape = shapes[ i ];
			addShape( shape );

		}

		// build geometry

		this.setAttribute( 'position', new Float32BufferAttribute( verticesArray, 3 ) );
		this.setAttribute( 'uv', new Float32BufferAttribute( uvArray, 2 ) );

		this.computeVertexNormals();

		// functions

		function addShape( shape ) {

			const placeholder = [];

			// options

			const curveSegments = options.curveSegments !== undefined ? options.curveSegments : 12;
			const steps = options.steps !== undefined ? options.steps : 1;
			const depth = options.depth !== undefined ? options.depth : 1;

			let bevelEnabled = options.bevelEnabled !== undefined ? options.bevelEnabled : true;
			let bevelThickness = options.bevelThickness !== undefined ? options.bevelThickness : 0.2;
			let bevelSize = options.bevelSize !== undefined ? options.bevelSize : bevelThickness - 0.1;
			let bevelOffset = options.bevelOffset !== undefined ? options.bevelOffset : 0;
			let bevelSegments = options.bevelSegments !== undefined ? options.bevelSegments : 3;

			const extrudePath = options.extrudePath;

			const uvgen = options.UVGenerator !== undefined ? options.UVGenerator : WorldUVGenerator;

			//

			let extrudePts, extrudeByPath = false;
			let splineTube, binormal, normal, position2;

			if ( extrudePath ) {

				extrudePts = extrudePath.getSpacedPoints( steps );

				extrudeByPath = true;
				bevelEnabled = false; // bevels not supported for path extrusion

				// SETUP TNB variables

				// TODO1 - have a .isClosed in spline?

				splineTube = extrudePath.computeFrenetFrames( steps, false );

				// console.log(splineTube, 'splineTube', splineTube.normals.length, 'steps', steps, 'extrudePts', extrudePts.length);

				binormal = new Vector3();
				normal = new Vector3();
				position2 = new Vector3();

			}

			// Safeguards if bevels are not enabled

			if ( ! bevelEnabled ) {

				bevelSegments = 0;
				bevelThickness = 0;
				bevelSize = 0;
				bevelOffset = 0;

			}

			// Variables initialization

			const shapePoints = shape.extractPoints( curveSegments );

			let vertices = shapePoints.shape;
			const holes = shapePoints.holes;

			const reverse = ! ShapeUtils.isClockWise( vertices );

			if ( reverse ) {

				vertices = vertices.reverse();

				// Maybe we should also check if holes are in the opposite direction, just to be safe ...

				for ( let h = 0, hl = holes.length; h < hl; h ++ ) {

					const ahole = holes[ h ];

					if ( ShapeUtils.isClockWise( ahole ) ) {

						holes[ h ] = ahole.reverse();

					}

				}

			}


			const faces = ShapeUtils.triangulateShape( vertices, holes );

			/* Vertices */

			const contour = vertices; // vertices has all points but contour has only points of circumference

			for ( let h = 0, hl = holes.length; h < hl; h ++ ) {

				const ahole = holes[ h ];

				vertices = vertices.concat( ahole );

			}


			function scalePt2( pt, vec, size ) {

				if ( ! vec ) console.error( 'THREE.ExtrudeGeometry: vec does not exist' );

				return pt.clone().addScaledVector( vec, size );

			}

			const vlen = vertices.length, flen = faces.length;


			// Find directions for point movement


			function getBevelVec( inPt, inPrev, inNext ) {

				// computes for inPt the corresponding point inPt' on a new contour
				//   shifted by 1 unit (length of normalized vector) to the left
				// if we walk along contour clockwise, this new contour is outside the old one
				//
				// inPt' is the intersection of the two lines parallel to the two
				//  adjacent edges of inPt at a distance of 1 unit on the left side.

				let v_trans_x, v_trans_y, shrink_by; // resulting translation vector for inPt

				// good reading for geometry algorithms (here: line-line intersection)
				// http://geomalgorithms.com/a05-_intersect-1.html

				const v_prev_x = inPt.x - inPrev.x,
					v_prev_y = inPt.y - inPrev.y;
				const v_next_x = inNext.x - inPt.x,
					v_next_y = inNext.y - inPt.y;

				const v_prev_lensq = ( v_prev_x * v_prev_x + v_prev_y * v_prev_y );

				// check for collinear edges
				const collinear0 = ( v_prev_x * v_next_y - v_prev_y * v_next_x );

				if ( Math.abs( collinear0 ) > Number.EPSILON ) {

					// not collinear

					// length of vectors for normalizing

					const v_prev_len = Math.sqrt( v_prev_lensq );
					const v_next_len = Math.sqrt( v_next_x * v_next_x + v_next_y * v_next_y );

					// shift adjacent points by unit vectors to the left

					const ptPrevShift_x = ( inPrev.x - v_prev_y / v_prev_len );
					const ptPrevShift_y = ( inPrev.y + v_prev_x / v_prev_len );

					const ptNextShift_x = ( inNext.x - v_next_y / v_next_len );
					const ptNextShift_y = ( inNext.y + v_next_x / v_next_len );

					// scaling factor for v_prev to intersection point

					const sf = ( ( ptNextShift_x - ptPrevShift_x ) * v_next_y -
							( ptNextShift_y - ptPrevShift_y ) * v_next_x ) /
						( v_prev_x * v_next_y - v_prev_y * v_next_x );

					// vector from inPt to intersection point

					v_trans_x = ( ptPrevShift_x + v_prev_x * sf - inPt.x );
					v_trans_y = ( ptPrevShift_y + v_prev_y * sf - inPt.y );

					// Don't normalize!, otherwise sharp corners become ugly
					//  but prevent crazy spikes
					const v_trans_lensq = ( v_trans_x * v_trans_x + v_trans_y * v_trans_y );
					if ( v_trans_lensq <= 2 ) {

						return new Vector2( v_trans_x, v_trans_y );

					} else {

						shrink_by = Math.sqrt( v_trans_lensq / 2 );

					}

				} else {

					// handle special case of collinear edges

					let direction_eq = false; // assumes: opposite

					if ( v_prev_x > Number.EPSILON ) {

						if ( v_next_x > Number.EPSILON ) {

							direction_eq = true;

						}

					} else {

						if ( v_prev_x < - Number.EPSILON ) {

							if ( v_next_x < - Number.EPSILON ) {

								direction_eq = true;

							}

						} else {

							if ( Math.sign( v_prev_y ) === Math.sign( v_next_y ) ) {

								direction_eq = true;

							}

						}

					}

					if ( direction_eq ) {

						// console.log("Warning: lines are a straight sequence");
						v_trans_x = - v_prev_y;
						v_trans_y = v_prev_x;
						shrink_by = Math.sqrt( v_prev_lensq );

					} else {

						// console.log("Warning: lines are a straight spike");
						v_trans_x = v_prev_x;
						v_trans_y = v_prev_y;
						shrink_by = Math.sqrt( v_prev_lensq / 2 );

					}

				}

				return new Vector2( v_trans_x / shrink_by, v_trans_y / shrink_by );

			}


			const contourMovements = [];

			for ( let i = 0, il = contour.length, j = il - 1, k = i + 1; i < il; i ++, j ++, k ++ ) {

				if ( j === il ) j = 0;
				if ( k === il ) k = 0;

				//  (j)---(i)---(k)
				// console.log('i,j,k', i, j , k)

				contourMovements[ i ] = getBevelVec( contour[ i ], contour[ j ], contour[ k ] );

			}

			const holesMovements = [];
			let oneHoleMovements, verticesMovements = contourMovements.concat();

			for ( let h = 0, hl = holes.length; h < hl; h ++ ) {

				const ahole = holes[ h ];

				oneHoleMovements = [];

				for ( let i = 0, il = ahole.length, j = il - 1, k = i + 1; i < il; i ++, j ++, k ++ ) {

					if ( j === il ) j = 0;
					if ( k === il ) k = 0;

					//  (j)---(i)---(k)
					oneHoleMovements[ i ] = getBevelVec( ahole[ i ], ahole[ j ], ahole[ k ] );

				}

				holesMovements.push( oneHoleMovements );
				verticesMovements = verticesMovements.concat( oneHoleMovements );

			}


			// Loop bevelSegments, 1 for the front, 1 for the back

			for ( let b = 0; b < bevelSegments; b ++ ) {

				//for ( b = bevelSegments; b > 0; b -- ) {

				const t = b / bevelSegments;
				const z = bevelThickness * Math.cos( t * Math.PI / 2 );
				const bs = bevelSize * Math.sin( t * Math.PI / 2 ) + bevelOffset;

				// contract shape

				for ( let i = 0, il = contour.length; i < il; i ++ ) {

					const vert = scalePt2( contour[ i ], contourMovements[ i ], bs );

					v( vert.x, vert.y, - z );

				}

				// expand holes

				for ( let h = 0, hl = holes.length; h < hl; h ++ ) {

					const ahole = holes[ h ];
					oneHoleMovements = holesMovements[ h ];

					for ( let i = 0, il = ahole.length; i < il; i ++ ) {

						const vert = scalePt2( ahole[ i ], oneHoleMovements[ i ], bs );

						v( vert.x, vert.y, - z );

					}

				}

			}

			const bs = bevelSize + bevelOffset;

			// Back facing vertices

			for ( let i = 0; i < vlen; i ++ ) {

				const vert = bevelEnabled ? scalePt2( vertices[ i ], verticesMovements[ i ], bs ) : vertices[ i ];

				if ( ! extrudeByPath ) {

					v( vert.x, vert.y, 0 );

				} else {

					// v( vert.x, vert.y + extrudePts[ 0 ].y, extrudePts[ 0 ].x );

					normal.copy( splineTube.normals[ 0 ] ).multiplyScalar( vert.x );
					binormal.copy( splineTube.binormals[ 0 ] ).multiplyScalar( vert.y );

					position2.copy( extrudePts[ 0 ] ).add( normal ).add( binormal );

					v( position2.x, position2.y, position2.z );

				}

			}

			// Add stepped vertices...
			// Including front facing vertices

			for ( let s = 1; s <= steps; s ++ ) {

				for ( let i = 0; i < vlen; i ++ ) {

					const vert = bevelEnabled ? scalePt2( vertices[ i ], verticesMovements[ i ], bs ) : vertices[ i ];

					if ( ! extrudeByPath ) {

						v( vert.x, vert.y, depth / steps * s );

					} else {

						// v( vert.x, vert.y + extrudePts[ s - 1 ].y, extrudePts[ s - 1 ].x );

						normal.copy( splineTube.normals[ s ] ).multiplyScalar( vert.x );
						binormal.copy( splineTube.binormals[ s ] ).multiplyScalar( vert.y );

						position2.copy( extrudePts[ s ] ).add( normal ).add( binormal );

						v( position2.x, position2.y, position2.z );

					}

				}

			}


			// Add bevel segments planes

			//for ( b = 1; b <= bevelSegments; b ++ ) {
			for ( let b = bevelSegments - 1; b >= 0; b -- ) {

				const t = b / bevelSegments;
				const z = bevelThickness * Math.cos( t * Math.PI / 2 );
				const bs = bevelSize * Math.sin( t * Math.PI / 2 ) + bevelOffset;

				// contract shape

				for ( let i = 0, il = contour.length; i < il; i ++ ) {

					const vert = scalePt2( contour[ i ], contourMovements[ i ], bs );
					v( vert.x, vert.y, depth + z );

				}

				// expand holes

				for ( let h = 0, hl = holes.length; h < hl; h ++ ) {

					const ahole = holes[ h ];
					oneHoleMovements = holesMovements[ h ];

					for ( let i = 0, il = ahole.length; i < il; i ++ ) {

						const vert = scalePt2( ahole[ i ], oneHoleMovements[ i ], bs );

						if ( ! extrudeByPath ) {

							v( vert.x, vert.y, depth + z );

						} else {

							v( vert.x, vert.y + extrudePts[ steps - 1 ].y, extrudePts[ steps - 1 ].x + z );

						}

					}

				}

			}

			/* Faces */

			// Top and bottom faces

			buildLidFaces();

			// Sides faces

			buildSideFaces();


			/////  Internal functions

			function buildLidFaces() {

				const start = verticesArray.length / 3;

				if ( bevelEnabled ) {

					let layer = 0; // steps + 1
					let offset = vlen * layer;

					// Bottom faces

					for ( let i = 0; i < flen; i ++ ) {

						const face = faces[ i ];
						f3( face[ 2 ] + offset, face[ 1 ] + offset, face[ 0 ] + offset );

					}

					layer = steps + bevelSegments * 2;
					offset = vlen * layer;

					// Top faces

					for ( let i = 0; i < flen; i ++ ) {

						const face = faces[ i ];
						f3( face[ 0 ] + offset, face[ 1 ] + offset, face[ 2 ] + offset );

					}

				} else {

					// Bottom faces

					for ( let i = 0; i < flen; i ++ ) {

						const face = faces[ i ];
						f3( face[ 2 ], face[ 1 ], face[ 0 ] );

					}

					// Top faces

					for ( let i = 0; i < flen; i ++ ) {

						const face = faces[ i ];
						f3( face[ 0 ] + vlen * steps, face[ 1 ] + vlen * steps, face[ 2 ] + vlen * steps );

					}

				}

				scope.addGroup( start, verticesArray.length / 3 - start, 0 );

			}

			// Create faces for the z-sides of the shape

			function buildSideFaces() {

				const start = verticesArray.length / 3;
				let layeroffset = 0;
				sidewalls( contour, layeroffset );
				layeroffset += contour.length;

				for ( let h = 0, hl = holes.length; h < hl; h ++ ) {

					const ahole = holes[ h ];
					sidewalls( ahole, layeroffset );

					//, true
					layeroffset += ahole.length;

				}


				scope.addGroup( start, verticesArray.length / 3 - start, 1 );


			}

			function sidewalls( contour, layeroffset ) {

				let i = contour.length;

				while ( -- i >= 0 ) {

					const j = i;
					let k = i - 1;
					if ( k < 0 ) k = contour.length - 1;

					//console.log('b', i,j, i-1, k,vertices.length);

					for ( let s = 0, sl = ( steps + bevelSegments * 2 ); s < sl; s ++ ) {

						const slen1 = vlen * s;
						const slen2 = vlen * ( s + 1 );

						const a = layeroffset + j + slen1,
							b = layeroffset + k + slen1,
							c = layeroffset + k + slen2,
							d = layeroffset + j + slen2;

						f4( a, b, c, d );

					}

				}

			}

			function v( x, y, z ) {

				placeholder.push( x );
				placeholder.push( y );
				placeholder.push( z );

			}


			function f3( a, b, c ) {

				addVertex( a );
				addVertex( b );
				addVertex( c );

				const nextIndex = verticesArray.length / 3;
				const uvs = uvgen.generateTopUV( scope, verticesArray, nextIndex - 3, nextIndex - 2, nextIndex - 1 );

				addUV( uvs[ 0 ] );
				addUV( uvs[ 1 ] );
				addUV( uvs[ 2 ] );

			}

			function f4( a, b, c, d ) {

				addVertex( a );
				addVertex( b );
				addVertex( d );

				addVertex( b );
				addVertex( c );
				addVertex( d );


				const nextIndex = verticesArray.length / 3;
				const uvs = uvgen.generateSideWallUV( scope, verticesArray, nextIndex - 6, nextIndex - 3, nextIndex - 2, nextIndex - 1 );

				addUV( uvs[ 0 ] );
				addUV( uvs[ 1 ] );
				addUV( uvs[ 3 ] );

				addUV( uvs[ 1 ] );
				addUV( uvs[ 2 ] );
				addUV( uvs[ 3 ] );

			}

			function addVertex( index ) {

				verticesArray.push( placeholder[ index * 3 + 0 ] );
				verticesArray.push( placeholder[ index * 3 + 1 ] );
				verticesArray.push( placeholder[ index * 3 + 2 ] );

			}


			function addUV( vector2 ) {

				uvArray.push( vector2.x );
				uvArray.push( vector2.y );

			}

		}

	}

	copy( source ) {

		super.copy( source );

		this.parameters = Object.assign( {}, source.parameters );

		return this;

	}

	toJSON() {

		const data = super.toJSON();

		const shapes = this.parameters.shapes;
		const options = this.parameters.options;

		return toJSON$1( shapes, options, data );

	}

	static fromJSON( data, shapes ) {

		const geometryShapes = [];

		for ( let j = 0, jl = data.shapes.length; j < jl; j ++ ) {

			const shape = shapes[ data.shapes[ j ] ];

			geometryShapes.push( shape );

		}

		const extrudePath = data.options.extrudePath;

		if ( extrudePath !== undefined ) {

			data.options.extrudePath = new Curves[ extrudePath.type ]().fromJSON( extrudePath );

		}

		return new ExtrudeGeometry( geometryShapes, data.options );

	}

}

const WorldUVGenerator = {

	generateTopUV: function ( geometry, vertices, indexA, indexB, indexC ) {

		const a_x = vertices[ indexA * 3 ];
		const a_y = vertices[ indexA * 3 + 1 ];
		const b_x = vertices[ indexB * 3 ];
		const b_y = vertices[ indexB * 3 + 1 ];
		const c_x = vertices[ indexC * 3 ];
		const c_y = vertices[ indexC * 3 + 1 ];

		return [
			new Vector2( a_x, a_y ),
			new Vector2( b_x, b_y ),
			new Vector2( c_x, c_y )
		];

	},

	generateSideWallUV: function ( geometry, vertices, indexA, indexB, indexC, indexD ) {

		const a_x = vertices[ indexA * 3 ];
		const a_y = vertices[ indexA * 3 + 1 ];
		const a_z = vertices[ indexA * 3 + 2 ];
		const b_x = vertices[ indexB * 3 ];
		const b_y = vertices[ indexB * 3 + 1 ];
		const b_z = vertices[ indexB * 3 + 2 ];
		const c_x = vertices[ indexC * 3 ];
		const c_y = vertices[ indexC * 3 + 1 ];
		const c_z = vertices[ indexC * 3 + 2 ];
		const d_x = vertices[ indexD * 3 ];
		const d_y = vertices[ indexD * 3 + 1 ];
		const d_z = vertices[ indexD * 3 + 2 ];

		if ( Math.abs( a_y - b_y ) < Math.abs( a_x - b_x ) ) {

			return [
				new Vector2( a_x, 1 - a_z ),
				new Vector2( b_x, 1 - b_z ),
				new Vector2( c_x, 1 - c_z ),
				new Vector2( d_x, 1 - d_z )
			];

		} else {

			return [
				new Vector2( a_y, 1 - a_z ),
				new Vector2( b_y, 1 - b_z ),
				new Vector2( c_y, 1 - c_z ),
				new Vector2( d_y, 1 - d_z )
			];

		}

	}

};

function toJSON$1( shapes, options, data ) {

	data.shapes = [];

	if ( Array.isArray( shapes ) ) {

		for ( let i = 0, l = shapes.length; i < l; i ++ ) {

			const shape = shapes[ i ];

			data.shapes.push( shape.uuid );

		}

	} else {

		data.shapes.push( shapes.uuid );

	}

	data.options = Object.assign( {}, options );

	if ( options.extrudePath !== undefined ) data.options.extrudePath = options.extrudePath.toJSON();

	return data;

}

class IcosahedronGeometry extends PolyhedronGeometry {

	constructor( radius = 1, detail = 0 ) {

		const t = ( 1 + Math.sqrt( 5 ) ) / 2;

		const vertices = [
			- 1, t, 0, 	1, t, 0, 	- 1, - t, 0, 	1, - t, 0,
			0, - 1, t, 	0, 1, t,	0, - 1, - t, 	0, 1, - t,
			t, 0, - 1, 	t, 0, 1, 	- t, 0, - 1, 	- t, 0, 1
		];

		const indices = [
			0, 11, 5, 	0, 5, 1, 	0, 1, 7, 	0, 7, 10, 	0, 10, 11,
			1, 5, 9, 	5, 11, 4,	11, 10, 2,	10, 7, 6,	7, 1, 8,
			3, 9, 4, 	3, 4, 2,	3, 2, 6,	3, 6, 8,	3, 8, 9,
			4, 9, 5, 	2, 4, 11,	6, 2, 10,	8, 6, 7,	9, 8, 1
		];

		super( vertices, indices, radius, detail );

		this.type = 'IcosahedronGeometry';

		this.parameters = {
			radius: radius,
			detail: detail
		};

	}

	static fromJSON( data ) {

		return new IcosahedronGeometry( data.radius, data.detail );

	}

}

class OctahedronGeometry extends PolyhedronGeometry {

	constructor( radius = 1, detail = 0 ) {

		const vertices = [
			1, 0, 0, 	- 1, 0, 0,	0, 1, 0,
			0, - 1, 0, 	0, 0, 1,	0, 0, - 1
		];

		const indices = [
			0, 2, 4,	0, 4, 3,	0, 3, 5,
			0, 5, 2,	1, 2, 5,	1, 5, 3,
			1, 3, 4,	1, 4, 2
		];

		super( vertices, indices, radius, detail );

		this.type = 'OctahedronGeometry';

		this.parameters = {
			radius: radius,
			detail: detail
		};

	}

	static fromJSON( data ) {

		return new OctahedronGeometry( data.radius, data.detail );

	}

}

class PlaneGeometry extends BufferGeometry {

	constructor( width = 1, height = 1, widthSegments = 1, heightSegments = 1 ) {

		super();

		this.type = 'PlaneGeometry';

		this.parameters = {
			width: width,
			height: height,
			widthSegments: widthSegments,
			heightSegments: heightSegments
		};

		const width_half = width / 2;
		const height_half = height / 2;

		const gridX = Math.floor( widthSegments );
		const gridY = Math.floor( heightSegments );

		const gridX1 = gridX + 1;
		const gridY1 = gridY + 1;

		const segment_width = width / gridX;
		const segment_height = height / gridY;

		//

		const indices = [];
		const vertices = [];
		const normals = [];
		const uvs = [];

		for ( let iy = 0; iy < gridY1; iy ++ ) {

			const y = iy * segment_height - height_half;

			for ( let ix = 0; ix < gridX1; ix ++ ) {

				const x = ix * segment_width - width_half;

				vertices.push( x, - y, 0 );

				normals.push( 0, 0, 1 );

				uvs.push( ix / gridX );
				uvs.push( 1 - ( iy / gridY ) );

			}

		}

		for ( let iy = 0; iy < gridY; iy ++ ) {

			for ( let ix = 0; ix < gridX; ix ++ ) {

				const a = ix + gridX1 * iy;
				const b = ix + gridX1 * ( iy + 1 );
				const c = ( ix + 1 ) + gridX1 * ( iy + 1 );
				const d = ( ix + 1 ) + gridX1 * iy;

				indices.push( a, b, d );
				indices.push( b, c, d );

			}

		}

		this.setIndex( indices );
		this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
		this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );
		this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );

	}

	copy( source ) {

		super.copy( source );

		this.parameters = Object.assign( {}, source.parameters );

		return this;

	}

	static fromJSON( data ) {

		return new PlaneGeometry( data.width, data.height, data.widthSegments, data.heightSegments );

	}

}

class RingGeometry extends BufferGeometry {

	constructor( innerRadius = 0.5, outerRadius = 1, thetaSegments = 32, phiSegments = 1, thetaStart = 0, thetaLength = Math.PI * 2 ) {

		super();

		this.type = 'RingGeometry';

		this.parameters = {
			innerRadius: innerRadius,
			outerRadius: outerRadius,
			thetaSegments: thetaSegments,
			phiSegments: phiSegments,
			thetaStart: thetaStart,
			thetaLength: thetaLength
		};

		thetaSegments = Math.max( 3, thetaSegments );
		phiSegments = Math.max( 1, phiSegments );

		// buffers

		const indices = [];
		const vertices = [];
		const normals = [];
		const uvs = [];

		// some helper variables

		let radius = innerRadius;
		const radiusStep = ( ( outerRadius - innerRadius ) / phiSegments );
		const vertex = new Vector3();
		const uv = new Vector2();

		// generate vertices, normals and uvs

		for ( let j = 0; j <= phiSegments; j ++ ) {

			for ( let i = 0; i <= thetaSegments; i ++ ) {

				// values are generate from the inside of the ring to the outside

				const segment = thetaStart + i / thetaSegments * thetaLength;

				// vertex

				vertex.x = radius * Math.cos( segment );
				vertex.y = radius * Math.sin( segment );

				vertices.push( vertex.x, vertex.y, vertex.z );

				// normal

				normals.push( 0, 0, 1 );

				// uv

				uv.x = ( vertex.x / outerRadius + 1 ) / 2;
				uv.y = ( vertex.y / outerRadius + 1 ) / 2;

				uvs.push( uv.x, uv.y );

			}

			// increase the radius for next row of vertices

			radius += radiusStep;

		}

		// indices

		for ( let j = 0; j < phiSegments; j ++ ) {

			const thetaSegmentLevel = j * ( thetaSegments + 1 );

			for ( let i = 0; i < thetaSegments; i ++ ) {

				const segment = i + thetaSegmentLevel;

				const a = segment;
				const b = segment + thetaSegments + 1;
				const c = segment + thetaSegments + 2;
				const d = segment + 1;

				// faces

				indices.push( a, b, d );
				indices.push( b, c, d );

			}

		}

		// build geometry

		this.setIndex( indices );
		this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
		this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );
		this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );

	}

	copy( source ) {

		super.copy( source );

		this.parameters = Object.assign( {}, source.parameters );

		return this;

	}

	static fromJSON( data ) {

		return new RingGeometry( data.innerRadius, data.outerRadius, data.thetaSegments, data.phiSegments, data.thetaStart, data.thetaLength );

	}

}

class ShapeGeometry extends BufferGeometry {

	constructor( shapes = new Shape( [ new Vector2( 0, 0.5 ), new Vector2( - 0.5, - 0.5 ), new Vector2( 0.5, - 0.5 ) ] ), curveSegments = 12 ) {

		super();

		this.type = 'ShapeGeometry';

		this.parameters = {
			shapes: shapes,
			curveSegments: curveSegments
		};

		// buffers

		const indices = [];
		const vertices = [];
		const normals = [];
		const uvs = [];

		// helper variables

		let groupStart = 0;
		let groupCount = 0;

		// allow single and array values for "shapes" parameter

		if ( Array.isArray( shapes ) === false ) {

			addShape( shapes );

		} else {

			for ( let i = 0; i < shapes.length; i ++ ) {

				addShape( shapes[ i ] );

				this.addGroup( groupStart, groupCount, i ); // enables MultiMaterial support

				groupStart += groupCount;
				groupCount = 0;

			}

		}

		// build geometry

		this.setIndex( indices );
		this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
		this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );
		this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );


		// helper functions

		function addShape( shape ) {

			const indexOffset = vertices.length / 3;
			const points = shape.extractPoints( curveSegments );

			let shapeVertices = points.shape;
			const shapeHoles = points.holes;

			// check direction of vertices

			if ( ShapeUtils.isClockWise( shapeVertices ) === false ) {

				shapeVertices = shapeVertices.reverse();

			}

			for ( let i = 0, l = shapeHoles.length; i < l; i ++ ) {

				const shapeHole = shapeHoles[ i ];

				if ( ShapeUtils.isClockWise( shapeHole ) === true ) {

					shapeHoles[ i ] = shapeHole.reverse();

				}

			}

			const faces = ShapeUtils.triangulateShape( shapeVertices, shapeHoles );

			// join vertices of inner and outer paths to a single array

			for ( let i = 0, l = shapeHoles.length; i < l; i ++ ) {

				const shapeHole = shapeHoles[ i ];
				shapeVertices = shapeVertices.concat( shapeHole );

			}

			// vertices, normals, uvs

			for ( let i = 0, l = shapeVertices.length; i < l; i ++ ) {

				const vertex = shapeVertices[ i ];

				vertices.push( vertex.x, vertex.y, 0 );
				normals.push( 0, 0, 1 );
				uvs.push( vertex.x, vertex.y ); // world uvs

			}

			// indices

			for ( let i = 0, l = faces.length; i < l; i ++ ) {

				const face = faces[ i ];

				const a = face[ 0 ] + indexOffset;
				const b = face[ 1 ] + indexOffset;
				const c = face[ 2 ] + indexOffset;

				indices.push( a, b, c );
				groupCount += 3;

			}

		}

	}

	copy( source ) {

		super.copy( source );

		this.parameters = Object.assign( {}, source.parameters );

		return this;

	}

	toJSON() {

		const data = super.toJSON();

		const shapes = this.parameters.shapes;

		return toJSON( shapes, data );

	}

	static fromJSON( data, shapes ) {

		const geometryShapes = [];

		for ( let j = 0, jl = data.shapes.length; j < jl; j ++ ) {

			const shape = shapes[ data.shapes[ j ] ];

			geometryShapes.push( shape );

		}

		return new ShapeGeometry( geometryShapes, data.curveSegments );

	}

}

function toJSON( shapes, data ) {

	data.shapes = [];

	if ( Array.isArray( shapes ) ) {

		for ( let i = 0, l = shapes.length; i < l; i ++ ) {

			const shape = shapes[ i ];

			data.shapes.push( shape.uuid );

		}

	} else {

		data.shapes.push( shapes.uuid );

	}

	return data;

}

class SphereGeometry extends BufferGeometry {

	constructor( radius = 1, widthSegments = 32, heightSegments = 16, phiStart = 0, phiLength = Math.PI * 2, thetaStart = 0, thetaLength = Math.PI ) {

		super();

		this.type = 'SphereGeometry';

		this.parameters = {
			radius: radius,
			widthSegments: widthSegments,
			heightSegments: heightSegments,
			phiStart: phiStart,
			phiLength: phiLength,
			thetaStart: thetaStart,
			thetaLength: thetaLength
		};

		widthSegments = Math.max( 3, Math.floor( widthSegments ) );
		heightSegments = Math.max( 2, Math.floor( heightSegments ) );

		const thetaEnd = Math.min( thetaStart + thetaLength, Math.PI );

		let index = 0;
		const grid = [];

		const vertex = new Vector3();
		const normal = new Vector3();

		// buffers

		const indices = [];
		const vertices = [];
		const normals = [];
		const uvs = [];

		// generate vertices, normals and uvs

		for ( let iy = 0; iy <= heightSegments; iy ++ ) {

			const verticesRow = [];

			const v = iy / heightSegments;

			// special case for the poles

			let uOffset = 0;

			if ( iy === 0 && thetaStart === 0 ) {

				uOffset = 0.5 / widthSegments;

			} else if ( iy === heightSegments && thetaEnd === Math.PI ) {

				uOffset = - 0.5 / widthSegments;

			}

			for ( let ix = 0; ix <= widthSegments; ix ++ ) {

				const u = ix / widthSegments;

				// vertex

				vertex.x = - radius * Math.cos( phiStart + u * phiLength ) * Math.sin( thetaStart + v * thetaLength );
				vertex.y = radius * Math.cos( thetaStart + v * thetaLength );
				vertex.z = radius * Math.sin( phiStart + u * phiLength ) * Math.sin( thetaStart + v * thetaLength );

				vertices.push( vertex.x, vertex.y, vertex.z );

				// normal

				normal.copy( vertex ).normalize();
				normals.push( normal.x, normal.y, normal.z );

				// uv

				uvs.push( u + uOffset, 1 - v );

				verticesRow.push( index ++ );

			}

			grid.push( verticesRow );

		}

		// indices

		for ( let iy = 0; iy < heightSegments; iy ++ ) {

			for ( let ix = 0; ix < widthSegments; ix ++ ) {

				const a = grid[ iy ][ ix + 1 ];
				const b = grid[ iy ][ ix ];
				const c = grid[ iy + 1 ][ ix ];
				const d = grid[ iy + 1 ][ ix + 1 ];

				if ( iy !== 0 || thetaStart > 0 ) indices.push( a, b, d );
				if ( iy !== heightSegments - 1 || thetaEnd < Math.PI ) indices.push( b, c, d );

			}

		}

		// build geometry

		this.setIndex( indices );
		this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
		this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );
		this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );

	}

	copy( source ) {

		super.copy( source );

		this.parameters = Object.assign( {}, source.parameters );

		return this;

	}

	static fromJSON( data ) {

		return new SphereGeometry( data.radius, data.widthSegments, data.heightSegments, data.phiStart, data.phiLength, data.thetaStart, data.thetaLength );

	}

}

class TetrahedronGeometry extends PolyhedronGeometry {

	constructor( radius = 1, detail = 0 ) {

		const vertices = [
			1, 1, 1, 	- 1, - 1, 1, 	- 1, 1, - 1, 	1, - 1, - 1
		];

		const indices = [
			2, 1, 0, 	0, 3, 2,	1, 3, 0,	2, 3, 1
		];

		super( vertices, indices, radius, detail );

		this.type = 'TetrahedronGeometry';

		this.parameters = {
			radius: radius,
			detail: detail
		};

	}

	static fromJSON( data ) {

		return new TetrahedronGeometry( data.radius, data.detail );

	}

}

class TorusGeometry extends BufferGeometry {

	constructor( radius = 1, tube = 0.4, radialSegments = 12, tubularSegments = 48, arc = Math.PI * 2 ) {

		super();

		this.type = 'TorusGeometry';

		this.parameters = {
			radius: radius,
			tube: tube,
			radialSegments: radialSegments,
			tubularSegments: tubularSegments,
			arc: arc
		};

		radialSegments = Math.floor( radialSegments );
		tubularSegments = Math.floor( tubularSegments );

		// buffers

		const indices = [];
		const vertices = [];
		const normals = [];
		const uvs = [];

		// helper variables

		const center = new Vector3();
		const vertex = new Vector3();
		const normal = new Vector3();

		// generate vertices, normals and uvs

		for ( let j = 0; j <= radialSegments; j ++ ) {

			for ( let i = 0; i <= tubularSegments; i ++ ) {

				const u = i / tubularSegments * arc;
				const v = j / radialSegments * Math.PI * 2;

				// vertex

				vertex.x = ( radius + tube * Math.cos( v ) ) * Math.cos( u );
				vertex.y = ( radius + tube * Math.cos( v ) ) * Math.sin( u );
				vertex.z = tube * Math.sin( v );

				vertices.push( vertex.x, vertex.y, vertex.z );

				// normal

				center.x = radius * Math.cos( u );
				center.y = radius * Math.sin( u );
				normal.subVectors( vertex, center ).normalize();

				normals.push( normal.x, normal.y, normal.z );

				// uv

				uvs.push( i / tubularSegments );
				uvs.push( j / radialSegments );

			}

		}

		// generate indices

		for ( let j = 1; j <= radialSegments; j ++ ) {

			for ( let i = 1; i <= tubularSegments; i ++ ) {

				// indices

				const a = ( tubularSegments + 1 ) * j + i - 1;
				const b = ( tubularSegments + 1 ) * ( j - 1 ) + i - 1;
				const c = ( tubularSegments + 1 ) * ( j - 1 ) + i;
				const d = ( tubularSegments + 1 ) * j + i;

				// faces

				indices.push( a, b, d );
				indices.push( b, c, d );

			}

		}

		// build geometry

		this.setIndex( indices );
		this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
		this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );
		this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );

	}

	copy( source ) {

		super.copy( source );

		this.parameters = Object.assign( {}, source.parameters );

		return this;

	}

	static fromJSON( data ) {

		return new TorusGeometry( data.radius, data.tube, data.radialSegments, data.tubularSegments, data.arc );

	}

}

class TorusKnotGeometry extends BufferGeometry {

	constructor( radius = 1, tube = 0.4, tubularSegments = 64, radialSegments = 8, p = 2, q = 3 ) {

		super();

		this.type = 'TorusKnotGeometry';

		this.parameters = {
			radius: radius,
			tube: tube,
			tubularSegments: tubularSegments,
			radialSegments: radialSegments,
			p: p,
			q: q
		};

		tubularSegments = Math.floor( tubularSegments );
		radialSegments = Math.floor( radialSegments );

		// buffers

		const indices = [];
		const vertices = [];
		const normals = [];
		const uvs = [];

		// helper variables

		const vertex = new Vector3();
		const normal = new Vector3();

		const P1 = new Vector3();
		const P2 = new Vector3();

		const B = new Vector3();
		const T = new Vector3();
		const N = new Vector3();

		// generate vertices, normals and uvs

		for ( let i = 0; i <= tubularSegments; ++ i ) {

			// the radian "u" is used to calculate the position on the torus curve of the current tubular segment

			const u = i / tubularSegments * p * Math.PI * 2;

			// now we calculate two points. P1 is our current position on the curve, P2 is a little farther ahead.
			// these points are used to create a special "coordinate space", which is necessary to calculate the correct vertex positions

			calculatePositionOnCurve( u, p, q, radius, P1 );
			calculatePositionOnCurve( u + 0.01, p, q, radius, P2 );

			// calculate orthonormal basis

			T.subVectors( P2, P1 );
			N.addVectors( P2, P1 );
			B.crossVectors( T, N );
			N.crossVectors( B, T );

			// normalize B, N. T can be ignored, we don't use it

			B.normalize();
			N.normalize();

			for ( let j = 0; j <= radialSegments; ++ j ) {

				// now calculate the vertices. they are nothing more than an extrusion of the torus curve.
				// because we extrude a shape in the xy-plane, there is no need to calculate a z-value.

				const v = j / radialSegments * Math.PI * 2;
				const cx = - tube * Math.cos( v );
				const cy = tube * Math.sin( v );

				// now calculate the final vertex position.
				// first we orient the extrusion with our basis vectors, then we add it to the current position on the curve

				vertex.x = P1.x + ( cx * N.x + cy * B.x );
				vertex.y = P1.y + ( cx * N.y + cy * B.y );
				vertex.z = P1.z + ( cx * N.z + cy * B.z );

				vertices.push( vertex.x, vertex.y, vertex.z );

				// normal (P1 is always the center/origin of the extrusion, thus we can use it to calculate the normal)

				normal.subVectors( vertex, P1 ).normalize();

				normals.push( normal.x, normal.y, normal.z );

				// uv

				uvs.push( i / tubularSegments );
				uvs.push( j / radialSegments );

			}

		}

		// generate indices

		for ( let j = 1; j <= tubularSegments; j ++ ) {

			for ( let i = 1; i <= radialSegments; i ++ ) {

				// indices

				const a = ( radialSegments + 1 ) * ( j - 1 ) + ( i - 1 );
				const b = ( radialSegments + 1 ) * j + ( i - 1 );
				const c = ( radialSegments + 1 ) * j + i;
				const d = ( radialSegments + 1 ) * ( j - 1 ) + i;

				// faces

				indices.push( a, b, d );
				indices.push( b, c, d );

			}

		}

		// build geometry

		this.setIndex( indices );
		this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
		this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );
		this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );

		// this function calculates the current position on the torus curve

		function calculatePositionOnCurve( u, p, q, radius, position ) {

			const cu = Math.cos( u );
			const su = Math.sin( u );
			const quOverP = q / p * u;
			const cs = Math.cos( quOverP );

			position.x = radius * ( 2 + cs ) * 0.5 * cu;
			position.y = radius * ( 2 + cs ) * su * 0.5;
			position.z = radius * Math.sin( quOverP ) * 0.5;

		}

	}

	copy( source ) {

		super.copy( source );

		this.parameters = Object.assign( {}, source.parameters );

		return this;

	}

	static fromJSON( data ) {

		return new TorusKnotGeometry( data.radius, data.tube, data.tubularSegments, data.radialSegments, data.p, data.q );

	}

}

class TubeGeometry extends BufferGeometry {

	constructor( path = new QuadraticBezierCurve3( new Vector3( - 1, - 1, 0 ), new Vector3( - 1, 1, 0 ), new Vector3( 1, 1, 0 ) ), tubularSegments = 64, radius = 1, radialSegments = 8, closed = false ) {

		super();

		this.type = 'TubeGeometry';

		this.parameters = {
			path: path,
			tubularSegments: tubularSegments,
			radius: radius,
			radialSegments: radialSegments,
			closed: closed
		};

		const frames = path.computeFrenetFrames( tubularSegments, closed );

		// expose internals

		this.tangents = frames.tangents;
		this.normals = frames.normals;
		this.binormals = frames.binormals;

		// helper variables

		const vertex = new Vector3();
		const normal = new Vector3();
		const uv = new Vector2();
		let P = new Vector3();

		// buffer

		const vertices = [];
		const normals = [];
		const uvs = [];
		const indices = [];

		// create buffer data

		generateBufferData();

		// build geometry

		this.setIndex( indices );
		this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
		this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );
		this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );

		// functions

		function generateBufferData() {

			for ( let i = 0; i < tubularSegments; i ++ ) {

				generateSegment( i );

			}

			// if the geometry is not closed, generate the last row of vertices and normals
			// at the regular position on the given path
			//
			// if the geometry is closed, duplicate the first row of vertices and normals (uvs will differ)

			generateSegment( ( closed === false ) ? tubularSegments : 0 );

			// uvs are generated in a separate function.
			// this makes it easy compute correct values for closed geometries

			generateUVs();

			// finally create faces

			generateIndices();

		}

		function generateSegment( i ) {

			// we use getPointAt to sample evenly distributed points from the given path

			P = path.getPointAt( i / tubularSegments, P );

			// retrieve corresponding normal and binormal

			const N = frames.normals[ i ];
			const B = frames.binormals[ i ];

			// generate normals and vertices for the current segment

			for ( let j = 0; j <= radialSegments; j ++ ) {

				const v = j / radialSegments * Math.PI * 2;

				const sin = Math.sin( v );
				const cos = - Math.cos( v );

				// normal

				normal.x = ( cos * N.x + sin * B.x );
				normal.y = ( cos * N.y + sin * B.y );
				normal.z = ( cos * N.z + sin * B.z );
				normal.normalize();

				normals.push( normal.x, normal.y, normal.z );

				// vertex

				vertex.x = P.x + radius * normal.x;
				vertex.y = P.y + radius * normal.y;
				vertex.z = P.z + radius * normal.z;

				vertices.push( vertex.x, vertex.y, vertex.z );

			}

		}

		function generateIndices() {

			for ( let j = 1; j <= tubularSegments; j ++ ) {

				for ( let i = 1; i <= radialSegments; i ++ ) {

					const a = ( radialSegments + 1 ) * ( j - 1 ) + ( i - 1 );
					const b = ( radialSegments + 1 ) * j + ( i - 1 );
					const c = ( radialSegments + 1 ) * j + i;
					const d = ( radialSegments + 1 ) * ( j - 1 ) + i;

					// faces

					indices.push( a, b, d );
					indices.push( b, c, d );

				}

			}

		}

		function generateUVs() {

			for ( let i = 0; i <= tubularSegments; i ++ ) {

				for ( let j = 0; j <= radialSegments; j ++ ) {

					uv.x = i / tubularSegments;
					uv.y = j / radialSegments;

					uvs.push( uv.x, uv.y );

				}

			}

		}

	}

	copy( source ) {

		super.copy( source );

		this.parameters = Object.assign( {}, source.parameters );

		return this;

	}

	toJSON() {

		const data = super.toJSON();

		data.path = this.parameters.path.toJSON();

		return data;

	}

	static fromJSON( data ) {

		// This only works for built-in curves (e.g. CatmullRomCurve3).
		// User defined curves or instances of CurvePath will not be deserialized.
		return new TubeGeometry(
			new Curves[ data.path.type ]().fromJSON( data.path ),
			data.tubularSegments,
			data.radius,
			data.radialSegments,
			data.closed
		);

	}

}

class WireframeGeometry extends BufferGeometry {

	constructor( geometry = null ) {

		super();

		this.type = 'WireframeGeometry';

		this.parameters = {
			geometry: geometry
		};

		if ( geometry !== null ) {

			// buffer

			const vertices = [];
			const edges = new Set();

			// helper variables

			const start = new Vector3();
			const end = new Vector3();

			if ( geometry.index !== null ) {

				// indexed BufferGeometry

				const position = geometry.attributes.position;
				const indices = geometry.index;
				let groups = geometry.groups;

				if ( groups.length === 0 ) {

					groups = [ { start: 0, count: indices.count, materialIndex: 0 } ];

				}

				// create a data structure that contains all edges without duplicates

				for ( let o = 0, ol = groups.length; o < ol; ++ o ) {

					const group = groups[ o ];

					const groupStart = group.start;
					const groupCount = group.count;

					for ( let i = groupStart, l = ( groupStart + groupCount ); i < l; i += 3 ) {

						for ( let j = 0; j < 3; j ++ ) {

							const index1 = indices.getX( i + j );
							const index2 = indices.getX( i + ( j + 1 ) % 3 );

							start.fromBufferAttribute( position, index1 );
							end.fromBufferAttribute( position, index2 );

							if ( isUniqueEdge( start, end, edges ) === true ) {

								vertices.push( start.x, start.y, start.z );
								vertices.push( end.x, end.y, end.z );

							}

						}

					}

				}

			} else {

				// non-indexed BufferGeometry

				const position = geometry.attributes.position;

				for ( let i = 0, l = ( position.count / 3 ); i < l; i ++ ) {

					for ( let j = 0; j < 3; j ++ ) {

						// three edges per triangle, an edge is represented as (index1, index2)
						// e.g. the first triangle has the following edges: (0,1),(1,2),(2,0)

						const index1 = 3 * i + j;
						const index2 = 3 * i + ( ( j + 1 ) % 3 );

						start.fromBufferAttribute( position, index1 );
						end.fromBufferAttribute( position, index2 );

						if ( isUniqueEdge( start, end, edges ) === true ) {

							vertices.push( start.x, start.y, start.z );
							vertices.push( end.x, end.y, end.z );

						}

					}

				}

			}

			// build geometry

			this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );

		}

	}

	copy( source ) {

		super.copy( source );

		this.parameters = Object.assign( {}, source.parameters );

		return this;

	}

}

function isUniqueEdge( start, end, edges ) {

	const hash1 = `${start.x},${start.y},${start.z}-${end.x},${end.y},${end.z}`;
	const hash2 = `${end.x},${end.y},${end.z}-${start.x},${start.y},${start.z}`; // coincident edge

	if ( edges.has( hash1 ) === true || edges.has( hash2 ) === true ) {

		return false;

	} else {

		edges.add( hash1 );
		edges.add( hash2 );
		return true;

	}

}

var Geometries$1 = /*#__PURE__*/Object.freeze({
	__proto__: null,
	BoxGeometry: BoxGeometry,
	CapsuleGeometry: CapsuleGeometry,
	CircleGeometry: CircleGeometry,
	ConeGeometry: ConeGeometry,
	CylinderGeometry: CylinderGeometry,
	DodecahedronGeometry: DodecahedronGeometry,
	EdgesGeometry: EdgesGeometry,
	ExtrudeGeometry: ExtrudeGeometry,
	IcosahedronGeometry: IcosahedronGeometry,
	LatheGeometry: LatheGeometry,
	OctahedronGeometry: OctahedronGeometry,
	PlaneGeometry: PlaneGeometry,
	PolyhedronGeometry: PolyhedronGeometry,
	RingGeometry: RingGeometry,
	ShapeGeometry: ShapeGeometry,
	SphereGeometry: SphereGeometry,
	TetrahedronGeometry: TetrahedronGeometry,
	TorusGeometry: TorusGeometry,
	TorusKnotGeometry: TorusKnotGeometry,
	TubeGeometry: TubeGeometry,
	WireframeGeometry: WireframeGeometry
});

class ShadowMaterial extends Material {

	constructor( parameters ) {

		super();

		this.isShadowMaterial = true;

		this.type = 'ShadowMaterial';

		this.color = new Color( 0x000000 );
		this.transparent = true;

		this.fog = true;

		this.setValues( parameters );

	}

	copy( source ) {

		super.copy( source );

		this.color.copy( source.color );

		this.fog = source.fog;

		return this;

	}

}

class RawShaderMaterial extends ShaderMaterial {

	constructor( parameters ) {

		super( parameters );

		this.isRawShaderMaterial = true;

		this.type = 'RawShaderMaterial';

	}

}

class MeshStandardMaterial extends Material {

	constructor( parameters ) {

		super();

		this.isMeshStandardMaterial = true;

		this.defines = { 'STANDARD': '' };

		this.type = 'MeshStandardMaterial';

		this.color = new Color( 0xffffff ); // diffuse
		this.roughness = 1.0;
		this.metalness = 0.0;

		this.map = null;

		this.lightMap = null;
		this.lightMapIntensity = 1.0;

		this.aoMap = null;
		this.aoMapIntensity = 1.0;

		this.emissive = new Color( 0x000000 );
		this.emissiveIntensity = 1.0;
		this.emissiveMap = null;

		this.bumpMap = null;
		this.bumpScale = 1;

		this.normalMap = null;
		this.normalMapType = TangentSpaceNormalMap;
		this.normalScale = new Vector2( 1, 1 );

		this.displacementMap = null;
		this.displacementScale = 1;
		this.displacementBias = 0;

		this.roughnessMap = null;

		this.metalnessMap = null;

		this.alphaMap = null;

		this.envMap = null;
		this.envMapRotation = new Euler();
		this.envMapIntensity = 1.0;

		this.wireframe = false;
		this.wireframeLinewidth = 1;
		this.wireframeLinecap = 'round';
		this.wireframeLinejoin = 'round';

		this.flatShading = false;

		this.fog = true;

		this.setValues( parameters );

	}

	copy( source ) {

		super.copy( source );

		this.defines = { 'STANDARD': '' };

		this.color.copy( source.color );
		this.roughness = source.roughness;
		this.metalness = source.metalness;

		this.map = source.map;

		this.lightMap = source.lightMap;
		this.lightMapIntensity = source.lightMapIntensity;

		this.aoMap = source.aoMap;
		this.aoMapIntensity = source.aoMapIntensity;

		this.emissive.copy( source.emissive );
		this.emissiveMap = source.emissiveMap;
		this.emissiveIntensity = source.emissiveIntensity;

		this.bumpMap = source.bumpMap;
		this.bumpScale = source.bumpScale;

		this.normalMap = source.normalMap;
		this.normalMapType = source.normalMapType;
		this.normalScale.copy( source.normalScale );

		this.displacementMap = source.displacementMap;
		this.displacementScale = source.displacementScale;
		this.displacementBias = source.displacementBias;

		this.roughnessMap = source.roughnessMap;

		this.metalnessMap = source.metalnessMap;

		this.alphaMap = source.alphaMap;

		this.envMap = source.envMap;
		this.envMapRotation.copy( source.envMapRotation );
		this.envMapIntensity = source.envMapIntensity;

		this.wireframe = source.wireframe;
		this.wireframeLinewidth = source.wireframeLinewidth;
		this.wireframeLinecap = source.wireframeLinecap;
		this.wireframeLinejoin = source.wireframeLinejoin;

		this.flatShading = source.flatShading;

		this.fog = source.fog;

		return this;

	}

}

class MeshPhysicalMaterial extends MeshStandardMaterial {

	constructor( parameters ) {

		super();

		this.isMeshPhysicalMaterial = true;

		this.defines = {

			'STANDARD': '',
			'PHYSICAL': ''

		};

		this.type = 'MeshPhysicalMaterial';

		this.anisotropyRotation = 0;
		this.anisotropyMap = null;

		this.clearcoatMap = null;
		this.clearcoatRoughness = 0.0;
		this.clearcoatRoughnessMap = null;
		this.clearcoatNormalScale = new Vector2( 1, 1 );
		this.clearcoatNormalMap = null;

		this.ior = 1.5;

		Object.defineProperty( this, 'reflectivity', {
			get: function () {

				return ( clamp$1( 2.5 * ( this.ior - 1 ) / ( this.ior + 1 ), 0, 1 ) );

			},
			set: function ( reflectivity ) {

				this.ior = ( 1 + 0.4 * reflectivity ) / ( 1 - 0.4 * reflectivity );

			}
		} );

		this.iridescenceMap = null;
		this.iridescenceIOR = 1.3;
		this.iridescenceThicknessRange = [ 100, 400 ];
		this.iridescenceThicknessMap = null;

		this.sheenColor = new Color( 0x000000 );
		this.sheenColorMap = null;
		this.sheenRoughness = 1.0;
		this.sheenRoughnessMap = null;

		this.transmissionMap = null;

		this.thickness = 0;
		this.thicknessMap = null;
		this.attenuationDistance = Infinity;
		this.attenuationColor = new Color( 1, 1, 1 );

		this.specularIntensity = 1.0;
		this.specularIntensityMap = null;
		this.specularColor = new Color( 1, 1, 1 );
		this.specularColorMap = null;

		this._anisotropy = 0;
		this._clearcoat = 0;
		this._dispersion = 0;
		this._iridescence = 0;
		this._sheen = 0.0;
		this._transmission = 0;

		this.setValues( parameters );

	}

	get anisotropy() {

		return this._anisotropy;

	}

	set anisotropy( value ) {

		if ( this._anisotropy > 0 !== value > 0 ) {

			this.version ++;

		}

		this._anisotropy = value;

	}

	get clearcoat() {

		return this._clearcoat;

	}

	set clearcoat( value ) {

		if ( this._clearcoat > 0 !== value > 0 ) {

			this.version ++;

		}

		this._clearcoat = value;

	}

	get iridescence() {

		return this._iridescence;

	}

	set iridescence( value ) {

		if ( this._iridescence > 0 !== value > 0 ) {

			this.version ++;

		}

		this._iridescence = value;

	}

	get dispersion() {

		return this._dispersion;

	}

	set dispersion( value ) {

		if ( this._dispersion > 0 !== value > 0 ) {

			this.version ++;

		}

		this._dispersion = value;

	}

	get sheen() {

		return this._sheen;

	}

	set sheen( value ) {

		if ( this._sheen > 0 !== value > 0 ) {

			this.version ++;

		}

		this._sheen = value;

	}

	get transmission() {

		return this._transmission;

	}

	set transmission( value ) {

		if ( this._transmission > 0 !== value > 0 ) {

			this.version ++;

		}

		this._transmission = value;

	}

	copy( source ) {

		super.copy( source );

		this.defines = {

			'STANDARD': '',
			'PHYSICAL': ''

		};

		this.anisotropy = source.anisotropy;
		this.anisotropyRotation = source.anisotropyRotation;
		this.anisotropyMap = source.anisotropyMap;

		this.clearcoat = source.clearcoat;
		this.clearcoatMap = source.clearcoatMap;
		this.clearcoatRoughness = source.clearcoatRoughness;
		this.clearcoatRoughnessMap = source.clearcoatRoughnessMap;
		this.clearcoatNormalMap = source.clearcoatNormalMap;
		this.clearcoatNormalScale.copy( source.clearcoatNormalScale );

		this.dispersion = source.dispersion;
		this.ior = source.ior;

		this.iridescence = source.iridescence;
		this.iridescenceMap = source.iridescenceMap;
		this.iridescenceIOR = source.iridescenceIOR;
		this.iridescenceThicknessRange = [ ...source.iridescenceThicknessRange ];
		this.iridescenceThicknessMap = source.iridescenceThicknessMap;

		this.sheen = source.sheen;
		this.sheenColor.copy( source.sheenColor );
		this.sheenColorMap = source.sheenColorMap;
		this.sheenRoughness = source.sheenRoughness;
		this.sheenRoughnessMap = source.sheenRoughnessMap;

		this.transmission = source.transmission;
		this.transmissionMap = source.transmissionMap;

		this.thickness = source.thickness;
		this.thicknessMap = source.thicknessMap;
		this.attenuationDistance = source.attenuationDistance;
		this.attenuationColor.copy( source.attenuationColor );

		this.specularIntensity = source.specularIntensity;
		this.specularIntensityMap = source.specularIntensityMap;
		this.specularColor.copy( source.specularColor );
		this.specularColorMap = source.specularColorMap;

		return this;

	}

}

class MeshPhongMaterial extends Material {

	constructor( parameters ) {

		super();

		this.isMeshPhongMaterial = true;

		this.type = 'MeshPhongMaterial';

		this.color = new Color( 0xffffff ); // diffuse
		this.specular = new Color( 0x111111 );
		this.shininess = 30;

		this.map = null;

		this.lightMap = null;
		this.lightMapIntensity = 1.0;

		this.aoMap = null;
		this.aoMapIntensity = 1.0;

		this.emissive = new Color( 0x000000 );
		this.emissiveIntensity = 1.0;
		this.emissiveMap = null;

		this.bumpMap = null;
		this.bumpScale = 1;

		this.normalMap = null;
		this.normalMapType = TangentSpaceNormalMap;
		this.normalScale = new Vector2( 1, 1 );

		this.displacementMap = null;
		this.displacementScale = 1;
		this.displacementBias = 0;

		this.specularMap = null;

		this.alphaMap = null;

		this.envMap = null;
		this.envMapRotation = new Euler();
		this.combine = MultiplyOperation;
		this.reflectivity = 1;
		this.refractionRatio = 0.98;

		this.wireframe = false;
		this.wireframeLinewidth = 1;
		this.wireframeLinecap = 'round';
		this.wireframeLinejoin = 'round';

		this.flatShading = false;

		this.fog = true;

		this.setValues( parameters );

	}

	copy( source ) {

		super.copy( source );

		this.color.copy( source.color );
		this.specular.copy( source.specular );
		this.shininess = source.shininess;

		this.map = source.map;

		this.lightMap = source.lightMap;
		this.lightMapIntensity = source.lightMapIntensity;

		this.aoMap = source.aoMap;
		this.aoMapIntensity = source.aoMapIntensity;

		this.emissive.copy( source.emissive );
		this.emissiveMap = source.emissiveMap;
		this.emissiveIntensity = source.emissiveIntensity;

		this.bumpMap = source.bumpMap;
		this.bumpScale = source.bumpScale;

		this.normalMap = source.normalMap;
		this.normalMapType = source.normalMapType;
		this.normalScale.copy( source.normalScale );

		this.displacementMap = source.displacementMap;
		this.displacementScale = source.displacementScale;
		this.displacementBias = source.displacementBias;

		this.specularMap = source.specularMap;

		this.alphaMap = source.alphaMap;

		this.envMap = source.envMap;
		this.envMapRotation.copy( source.envMapRotation );
		this.combine = source.combine;
		this.reflectivity = source.reflectivity;
		this.refractionRatio = source.refractionRatio;

		this.wireframe = source.wireframe;
		this.wireframeLinewidth = source.wireframeLinewidth;
		this.wireframeLinecap = source.wireframeLinecap;
		this.wireframeLinejoin = source.wireframeLinejoin;

		this.flatShading = source.flatShading;

		this.fog = source.fog;

		return this;

	}

}

class MeshToonMaterial extends Material {

	constructor( parameters ) {

		super();

		this.isMeshToonMaterial = true;

		this.defines = { 'TOON': '' };

		this.type = 'MeshToonMaterial';

		this.color = new Color( 0xffffff );

		this.map = null;
		this.gradientMap = null;

		this.lightMap = null;
		this.lightMapIntensity = 1.0;

		this.aoMap = null;
		this.aoMapIntensity = 1.0;

		this.emissive = new Color( 0x000000 );
		this.emissiveIntensity = 1.0;
		this.emissiveMap = null;

		this.bumpMap = null;
		this.bumpScale = 1;

		this.normalMap = null;
		this.normalMapType = TangentSpaceNormalMap;
		this.normalScale = new Vector2( 1, 1 );

		this.displacementMap = null;
		this.displacementScale = 1;
		this.displacementBias = 0;

		this.alphaMap = null;

		this.wireframe = false;
		this.wireframeLinewidth = 1;
		this.wireframeLinecap = 'round';
		this.wireframeLinejoin = 'round';

		this.fog = true;

		this.setValues( parameters );

	}

	copy( source ) {

		super.copy( source );

		this.color.copy( source.color );

		this.map = source.map;
		this.gradientMap = source.gradientMap;

		this.lightMap = source.lightMap;
		this.lightMapIntensity = source.lightMapIntensity;

		this.aoMap = source.aoMap;
		this.aoMapIntensity = source.aoMapIntensity;

		this.emissive.copy( source.emissive );
		this.emissiveMap = source.emissiveMap;
		this.emissiveIntensity = source.emissiveIntensity;

		this.bumpMap = source.bumpMap;
		this.bumpScale = source.bumpScale;

		this.normalMap = source.normalMap;
		this.normalMapType = source.normalMapType;
		this.normalScale.copy( source.normalScale );

		this.displacementMap = source.displacementMap;
		this.displacementScale = source.displacementScale;
		this.displacementBias = source.displacementBias;

		this.alphaMap = source.alphaMap;

		this.wireframe = source.wireframe;
		this.wireframeLinewidth = source.wireframeLinewidth;
		this.wireframeLinecap = source.wireframeLinecap;
		this.wireframeLinejoin = source.wireframeLinejoin;

		this.fog = source.fog;

		return this;

	}

}

class MeshNormalMaterial extends Material {

	constructor( parameters ) {

		super();

		this.isMeshNormalMaterial = true;

		this.type = 'MeshNormalMaterial';

		this.bumpMap = null;
		this.bumpScale = 1;

		this.normalMap = null;
		this.normalMapType = TangentSpaceNormalMap;
		this.normalScale = new Vector2( 1, 1 );

		this.displacementMap = null;
		this.displacementScale = 1;
		this.displacementBias = 0;

		this.wireframe = false;
		this.wireframeLinewidth = 1;

		this.flatShading = false;

		this.setValues( parameters );

	}

	copy( source ) {

		super.copy( source );

		this.bumpMap = source.bumpMap;
		this.bumpScale = source.bumpScale;

		this.normalMap = source.normalMap;
		this.normalMapType = source.normalMapType;
		this.normalScale.copy( source.normalScale );

		this.displacementMap = source.displacementMap;
		this.displacementScale = source.displacementScale;
		this.displacementBias = source.displacementBias;

		this.wireframe = source.wireframe;
		this.wireframeLinewidth = source.wireframeLinewidth;

		this.flatShading = source.flatShading;

		return this;

	}

}

class MeshLambertMaterial extends Material {

	constructor( parameters ) {

		super();

		this.isMeshLambertMaterial = true;

		this.type = 'MeshLambertMaterial';

		this.color = new Color( 0xffffff ); // diffuse

		this.map = null;

		this.lightMap = null;
		this.lightMapIntensity = 1.0;

		this.aoMap = null;
		this.aoMapIntensity = 1.0;

		this.emissive = new Color( 0x000000 );
		this.emissiveIntensity = 1.0;
		this.emissiveMap = null;

		this.bumpMap = null;
		this.bumpScale = 1;

		this.normalMap = null;
		this.normalMapType = TangentSpaceNormalMap;
		this.normalScale = new Vector2( 1, 1 );

		this.displacementMap = null;
		this.displacementScale = 1;
		this.displacementBias = 0;

		this.specularMap = null;

		this.alphaMap = null;

		this.envMap = null;
		this.envMapRotation = new Euler();
		this.combine = MultiplyOperation;
		this.reflectivity = 1;
		this.refractionRatio = 0.98;

		this.wireframe = false;
		this.wireframeLinewidth = 1;
		this.wireframeLinecap = 'round';
		this.wireframeLinejoin = 'round';

		this.flatShading = false;

		this.fog = true;

		this.setValues( parameters );

	}

	copy( source ) {

		super.copy( source );

		this.color.copy( source.color );

		this.map = source.map;

		this.lightMap = source.lightMap;
		this.lightMapIntensity = source.lightMapIntensity;

		this.aoMap = source.aoMap;
		this.aoMapIntensity = source.aoMapIntensity;

		this.emissive.copy( source.emissive );
		this.emissiveMap = source.emissiveMap;
		this.emissiveIntensity = source.emissiveIntensity;

		this.bumpMap = source.bumpMap;
		this.bumpScale = source.bumpScale;

		this.normalMap = source.normalMap;
		this.normalMapType = source.normalMapType;
		this.normalScale.copy( source.normalScale );

		this.displacementMap = source.displacementMap;
		this.displacementScale = source.displacementScale;
		this.displacementBias = source.displacementBias;

		this.specularMap = source.specularMap;

		this.alphaMap = source.alphaMap;

		this.envMap = source.envMap;
		this.envMapRotation.copy( source.envMapRotation );
		this.combine = source.combine;
		this.reflectivity = source.reflectivity;
		this.refractionRatio = source.refractionRatio;

		this.wireframe = source.wireframe;
		this.wireframeLinewidth = source.wireframeLinewidth;
		this.wireframeLinecap = source.wireframeLinecap;
		this.wireframeLinejoin = source.wireframeLinejoin;

		this.flatShading = source.flatShading;

		this.fog = source.fog;

		return this;

	}

}

class MeshDepthMaterial extends Material {

	constructor( parameters ) {

		super();

		this.isMeshDepthMaterial = true;

		this.type = 'MeshDepthMaterial';

		this.depthPacking = BasicDepthPacking;

		this.map = null;

		this.alphaMap = null;

		this.displacementMap = null;
		this.displacementScale = 1;
		this.displacementBias = 0;

		this.wireframe = false;
		this.wireframeLinewidth = 1;

		this.setValues( parameters );

	}

	copy( source ) {

		super.copy( source );

		this.depthPacking = source.depthPacking;

		this.map = source.map;

		this.alphaMap = source.alphaMap;

		this.displacementMap = source.displacementMap;
		this.displacementScale = source.displacementScale;
		this.displacementBias = source.displacementBias;

		this.wireframe = source.wireframe;
		this.wireframeLinewidth = source.wireframeLinewidth;

		return this;

	}

}

class MeshDistanceMaterial extends Material {

	constructor( parameters ) {

		super();

		this.isMeshDistanceMaterial = true;

		this.type = 'MeshDistanceMaterial';

		this.map = null;

		this.alphaMap = null;

		this.displacementMap = null;
		this.displacementScale = 1;
		this.displacementBias = 0;

		this.setValues( parameters );

	}

	copy( source ) {

		super.copy( source );

		this.map = source.map;

		this.alphaMap = source.alphaMap;

		this.displacementMap = source.displacementMap;
		this.displacementScale = source.displacementScale;
		this.displacementBias = source.displacementBias;

		return this;

	}

}

class MeshMatcapMaterial extends Material {

	constructor( parameters ) {

		super();

		this.isMeshMatcapMaterial = true;

		this.defines = { 'MATCAP': '' };

		this.type = 'MeshMatcapMaterial';

		this.color = new Color( 0xffffff ); // diffuse

		this.matcap = null;

		this.map = null;

		this.bumpMap = null;
		this.bumpScale = 1;

		this.normalMap = null;
		this.normalMapType = TangentSpaceNormalMap;
		this.normalScale = new Vector2( 1, 1 );

		this.displacementMap = null;
		this.displacementScale = 1;
		this.displacementBias = 0;

		this.alphaMap = null;

		this.flatShading = false;

		this.fog = true;

		this.setValues( parameters );

	}


	copy( source ) {

		super.copy( source );

		this.defines = { 'MATCAP': '' };

		this.color.copy( source.color );

		this.matcap = source.matcap;

		this.map = source.map;

		this.bumpMap = source.bumpMap;
		this.bumpScale = source.bumpScale;

		this.normalMap = source.normalMap;
		this.normalMapType = source.normalMapType;
		this.normalScale.copy( source.normalScale );

		this.displacementMap = source.displacementMap;
		this.displacementScale = source.displacementScale;
		this.displacementBias = source.displacementBias;

		this.alphaMap = source.alphaMap;

		this.flatShading = source.flatShading;

		this.fog = source.fog;

		return this;

	}

}

class LineDashedMaterial extends LineBasicMaterial {

	constructor( parameters ) {

		super();

		this.isLineDashedMaterial = true;

		this.type = 'LineDashedMaterial';

		this.scale = 1;
		this.dashSize = 3;
		this.gapSize = 1;

		this.setValues( parameters );

	}

	copy( source ) {

		super.copy( source );

		this.scale = source.scale;
		this.dashSize = source.dashSize;
		this.gapSize = source.gapSize;

		return this;

	}

}

// converts an array to a specific type
function convertArray( array, type, forceClone ) {

	if ( ! array || // let 'undefined' and 'null' pass
		! forceClone && array.constructor === type ) return array;

	if ( typeof type.BYTES_PER_ELEMENT === 'number' ) {

		return new type( array ); // create typed array

	}

	return Array.prototype.slice.call( array ); // create Array

}

function isTypedArray( object ) {

	return ArrayBuffer.isView( object ) &&
		! ( object instanceof DataView );

}

// returns an array by which times and values can be sorted
function getKeyframeOrder( times ) {

	function compareTime( i, j ) {

		return times[ i ] - times[ j ];

	}

	const n = times.length;
	const result = new Array( n );
	for ( let i = 0; i !== n; ++ i ) result[ i ] = i;

	result.sort( compareTime );

	return result;

}

// uses the array previously returned by 'getKeyframeOrder' to sort data
function sortedArray( values, stride, order ) {

	const nValues = values.length;
	const result = new values.constructor( nValues );

	for ( let i = 0, dstOffset = 0; dstOffset !== nValues; ++ i ) {

		const srcOffset = order[ i ] * stride;

		for ( let j = 0; j !== stride; ++ j ) {

			result[ dstOffset ++ ] = values[ srcOffset + j ];

		}

	}

	return result;

}

// function for parsing AOS keyframe formats
function flattenJSON( jsonKeys, times, values, valuePropertyName ) {

	let i = 1, key = jsonKeys[ 0 ];

	while ( key !== undefined && key[ valuePropertyName ] === undefined ) {

		key = jsonKeys[ i ++ ];

	}

	if ( key === undefined ) return; // no data

	let value = key[ valuePropertyName ];
	if ( value === undefined ) return; // no data

	if ( Array.isArray( value ) ) {

		do {

			value = key[ valuePropertyName ];

			if ( value !== undefined ) {

				times.push( key.time );
				values.push.apply( values, value ); // push all elements

			}

			key = jsonKeys[ i ++ ];

		} while ( key !== undefined );

	} else if ( value.toArray !== undefined ) {

		// ...assume THREE.Math-ish

		do {

			value = key[ valuePropertyName ];

			if ( value !== undefined ) {

				times.push( key.time );
				value.toArray( values, values.length );

			}

			key = jsonKeys[ i ++ ];

		} while ( key !== undefined );

	} else {

		// otherwise push as-is

		do {

			value = key[ valuePropertyName ];

			if ( value !== undefined ) {

				times.push( key.time );
				values.push( value );

			}

			key = jsonKeys[ i ++ ];

		} while ( key !== undefined );

	}

}

function subclip( sourceClip, name, startFrame, endFrame, fps = 30 ) {

	const clip = sourceClip.clone();

	clip.name = name;

	const tracks = [];

	for ( let i = 0; i < clip.tracks.length; ++ i ) {

		const track = clip.tracks[ i ];
		const valueSize = track.getValueSize();

		const times = [];
		const values = [];

		for ( let j = 0; j < track.times.length; ++ j ) {

			const frame = track.times[ j ] * fps;

			if ( frame < startFrame || frame >= endFrame ) continue;

			times.push( track.times[ j ] );

			for ( let k = 0; k < valueSize; ++ k ) {

				values.push( track.values[ j * valueSize + k ] );

			}

		}

		if ( times.length === 0 ) continue;

		track.times = convertArray( times, track.times.constructor );
		track.values = convertArray( values, track.values.constructor );

		tracks.push( track );

	}

	clip.tracks = tracks;

	// find minimum .times value across all tracks in the trimmed clip

	let minStartTime = Infinity;

	for ( let i = 0; i < clip.tracks.length; ++ i ) {

		if ( minStartTime > clip.tracks[ i ].times[ 0 ] ) {

			minStartTime = clip.tracks[ i ].times[ 0 ];

		}

	}

	// shift all tracks such that clip begins at t=0

	for ( let i = 0; i < clip.tracks.length; ++ i ) {

		clip.tracks[ i ].shift( - 1 * minStartTime );

	}

	clip.resetDuration();

	return clip;

}

function makeClipAdditive( targetClip, referenceFrame = 0, referenceClip = targetClip, fps = 30 ) {

	if ( fps <= 0 ) fps = 30;

	const numTracks = referenceClip.tracks.length;
	const referenceTime = referenceFrame / fps;

	// Make each track's values relative to the values at the reference frame
	for ( let i = 0; i < numTracks; ++ i ) {

		const referenceTrack = referenceClip.tracks[ i ];
		const referenceTrackType = referenceTrack.ValueTypeName;

		// Skip this track if it's non-numeric
		if ( referenceTrackType === 'bool' || referenceTrackType === 'string' ) continue;

		// Find the track in the target clip whose name and type matches the reference track
		const targetTrack = targetClip.tracks.find( function ( track ) {

			return track.name === referenceTrack.name
				&& track.ValueTypeName === referenceTrackType;

		} );

		if ( targetTrack === undefined ) continue;

		let referenceOffset = 0;
		const referenceValueSize = referenceTrack.getValueSize();

		if ( referenceTrack.createInterpolant.isInterpolantFactoryMethodGLTFCubicSpline ) {

			referenceOffset = referenceValueSize / 3;

		}

		let targetOffset = 0;
		const targetValueSize = targetTrack.getValueSize();

		if ( targetTrack.createInterpolant.isInterpolantFactoryMethodGLTFCubicSpline ) {

			targetOffset = targetValueSize / 3;

		}

		const lastIndex = referenceTrack.times.length - 1;
		let referenceValue;

		// Find the value to subtract out of the track
		if ( referenceTime <= referenceTrack.times[ 0 ] ) {

			// Reference frame is earlier than the first keyframe, so just use the first keyframe
			const startIndex = referenceOffset;
			const endIndex = referenceValueSize - referenceOffset;
			referenceValue = referenceTrack.values.slice( startIndex, endIndex );

		} else if ( referenceTime >= referenceTrack.times[ lastIndex ] ) {

			// Reference frame is after the last keyframe, so just use the last keyframe
			const startIndex = lastIndex * referenceValueSize + referenceOffset;
			const endIndex = startIndex + referenceValueSize - referenceOffset;
			referenceValue = referenceTrack.values.slice( startIndex, endIndex );

		} else {

			// Interpolate to the reference value
			const interpolant = referenceTrack.createInterpolant();
			const startIndex = referenceOffset;
			const endIndex = referenceValueSize - referenceOffset;
			interpolant.evaluate( referenceTime );
			referenceValue = interpolant.resultBuffer.slice( startIndex, endIndex );

		}

		// Conjugate the quaternion
		if ( referenceTrackType === 'quaternion' ) {

			const referenceQuat = new Quaternion().fromArray( referenceValue ).normalize().conjugate();
			referenceQuat.toArray( referenceValue );

		}

		// Subtract the reference value from all of the track values

		const numTimes = targetTrack.times.length;
		for ( let j = 0; j < numTimes; ++ j ) {

			const valueStart = j * targetValueSize + targetOffset;

			if ( referenceTrackType === 'quaternion' ) {

				// Multiply the conjugate for quaternion track types
				Quaternion.multiplyQuaternionsFlat(
					targetTrack.values,
					valueStart,
					referenceValue,
					0,
					targetTrack.values,
					valueStart
				);

			} else {

				const valueEnd = targetValueSize - targetOffset * 2;

				// Subtract each value for all other numeric track types
				for ( let k = 0; k < valueEnd; ++ k ) {

					targetTrack.values[ valueStart + k ] -= referenceValue[ k ];

				}

			}

		}

	}

	targetClip.blendMode = AdditiveAnimationBlendMode;

	return targetClip;

}

const AnimationUtils = {
	convertArray: convertArray,
	isTypedArray: isTypedArray,
	getKeyframeOrder: getKeyframeOrder,
	sortedArray: sortedArray,
	flattenJSON: flattenJSON,
	subclip: subclip,
	makeClipAdditive: makeClipAdditive
};

/**
 * Abstract base class of interpolants over parametric samples.
 *
 * The parameter domain is one dimensional, typically the time or a path
 * along a curve defined by the data.
 *
 * The sample values can have any dimensionality and derived classes may
 * apply special interpretations to the data.
 *
 * This class provides the interval seek in a Template Method, deferring
 * the actual interpolation to derived classes.
 *
 * Time complexity is O(1) for linear access crossing at most two points
 * and O(log N) for random access, where N is the number of positions.
 *
 * References:
 *
 * 		http://www.oodesign.com/template-method-pattern.html
 *
 */

class Interpolant {

	constructor( parameterPositions, sampleValues, sampleSize, resultBuffer ) {

		this.parameterPositions = parameterPositions;
		this._cachedIndex = 0;

		this.resultBuffer = resultBuffer !== undefined ?
			resultBuffer : new sampleValues.constructor( sampleSize );
		this.sampleValues = sampleValues;
		this.valueSize = sampleSize;

		this.settings = null;
		this.DefaultSettings_ = {};

	}

	evaluate( t ) {

		const pp = this.parameterPositions;
		let i1 = this._cachedIndex,
			t1 = pp[ i1 ],
			t0 = pp[ i1 - 1 ];

		validate_interval: {

			seek: {

				let right;

				linear_scan: {

					//- See http://jsperf.com/comparison-to-undefined/3
					//- slower code:
					//-
					//- 				if ( t >= t1 || t1 === undefined ) {
					forward_scan: if ( ! ( t < t1 ) ) {

						for ( let giveUpAt = i1 + 2; ; ) {

							if ( t1 === undefined ) {

								if ( t < t0 ) break forward_scan;

								// after end

								i1 = pp.length;
								this._cachedIndex = i1;
								return this.copySampleValue_( i1 - 1 );

							}

							if ( i1 === giveUpAt ) break; // this loop

							t0 = t1;
							t1 = pp[ ++ i1 ];

							if ( t < t1 ) {

								// we have arrived at the sought interval
								break seek;

							}

						}

						// prepare binary search on the right side of the index
						right = pp.length;
						break linear_scan;

					}

					//- slower code:
					//-					if ( t < t0 || t0 === undefined ) {
					if ( ! ( t >= t0 ) ) {

						// looping?

						const t1global = pp[ 1 ];

						if ( t < t1global ) {

							i1 = 2; // + 1, using the scan for the details
							t0 = t1global;

						}

						// linear reverse scan

						for ( let giveUpAt = i1 - 2; ; ) {

							if ( t0 === undefined ) {

								// before start

								this._cachedIndex = 0;
								return this.copySampleValue_( 0 );

							}

							if ( i1 === giveUpAt ) break; // this loop

							t1 = t0;
							t0 = pp[ -- i1 - 1 ];

							if ( t >= t0 ) {

								// we have arrived at the sought interval
								break seek;

							}

						}

						// prepare binary search on the left side of the index
						right = i1;
						i1 = 0;
						break linear_scan;

					}

					// the interval is valid

					break validate_interval;

				} // linear scan

				// binary search

				while ( i1 < right ) {

					const mid = ( i1 + right ) >>> 1;

					if ( t < pp[ mid ] ) {

						right = mid;

					} else {

						i1 = mid + 1;

					}

				}

				t1 = pp[ i1 ];
				t0 = pp[ i1 - 1 ];

				// check boundary cases, again

				if ( t0 === undefined ) {

					this._cachedIndex = 0;
					return this.copySampleValue_( 0 );

				}

				if ( t1 === undefined ) {

					i1 = pp.length;
					this._cachedIndex = i1;
					return this.copySampleValue_( i1 - 1 );

				}

			} // seek

			this._cachedIndex = i1;

			this.intervalChanged_( i1, t0, t1 );

		} // validate_interval

		return this.interpolate_( i1, t0, t, t1 );

	}

	getSettings_() {

		return this.settings || this.DefaultSettings_;

	}

	copySampleValue_( index ) {

		// copies a sample value to the result buffer

		const result = this.resultBuffer,
			values = this.sampleValues,
			stride = this.valueSize,
			offset = index * stride;

		for ( let i = 0; i !== stride; ++ i ) {

			result[ i ] = values[ offset + i ];

		}

		return result;

	}

	// Template methods for derived classes:

	interpolate_( /* i1, t0, t, t1 */ ) {

		throw new Error( 'call to abstract method' );
		// implementations shall return this.resultBuffer

	}

	intervalChanged_( /* i1, t0, t1 */ ) {

		// empty

	}

}

/**
 * Fast and simple cubic spline interpolant.
 *
 * It was derived from a Hermitian construction setting the first derivative
 * at each sample position to the linear slope between neighboring positions
 * over their parameter interval.
 */

class CubicInterpolant extends Interpolant {

	constructor( parameterPositions, sampleValues, sampleSize, resultBuffer ) {

		super( parameterPositions, sampleValues, sampleSize, resultBuffer );

		this._weightPrev = - 0;
		this._offsetPrev = - 0;
		this._weightNext = - 0;
		this._offsetNext = - 0;

		this.DefaultSettings_ = {

			endingStart: ZeroCurvatureEnding,
			endingEnd: ZeroCurvatureEnding

		};

	}

	intervalChanged_( i1, t0, t1 ) {

		const pp = this.parameterPositions;
		let iPrev = i1 - 2,
			iNext = i1 + 1,

			tPrev = pp[ iPrev ],
			tNext = pp[ iNext ];

		if ( tPrev === undefined ) {

			switch ( this.getSettings_().endingStart ) {

				case ZeroSlopeEnding:

					// f'(t0) = 0
					iPrev = i1;
					tPrev = 2 * t0 - t1;

					break;

				case WrapAroundEnding:

					// use the other end of the curve
					iPrev = pp.length - 2;
					tPrev = t0 + pp[ iPrev ] - pp[ iPrev + 1 ];

					break;

				default: // ZeroCurvatureEnding

					// f''(t0) = 0 a.k.a. Natural Spline
					iPrev = i1;
					tPrev = t1;

			}

		}

		if ( tNext === undefined ) {

			switch ( this.getSettings_().endingEnd ) {

				case ZeroSlopeEnding:

					// f'(tN) = 0
					iNext = i1;
					tNext = 2 * t1 - t0;

					break;

				case WrapAroundEnding:

					// use the other end of the curve
					iNext = 1;
					tNext = t1 + pp[ 1 ] - pp[ 0 ];

					break;

				default: // ZeroCurvatureEnding

					// f''(tN) = 0, a.k.a. Natural Spline
					iNext = i1 - 1;
					tNext = t0;

			}

		}

		const halfDt = ( t1 - t0 ) * 0.5,
			stride = this.valueSize;

		this._weightPrev = halfDt / ( t0 - tPrev );
		this._weightNext = halfDt / ( tNext - t1 );
		this._offsetPrev = iPrev * stride;
		this._offsetNext = iNext * stride;

	}

	interpolate_( i1, t0, t, t1 ) {

		const result = this.resultBuffer,
			values = this.sampleValues,
			stride = this.valueSize,

			o1 = i1 * stride,		o0 = o1 - stride,
			oP = this._offsetPrev, 	oN = this._offsetNext,
			wP = this._weightPrev,	wN = this._weightNext,

			p = ( t - t0 ) / ( t1 - t0 ),
			pp = p * p,
			ppp = pp * p;

		// evaluate polynomials

		const sP = - wP * ppp + 2 * wP * pp - wP * p;
		const s0 = ( 1 + wP ) * ppp + ( - 1.5 - 2 * wP ) * pp + ( - 0.5 + wP ) * p + 1;
		const s1 = ( - 1 - wN ) * ppp + ( 1.5 + wN ) * pp + 0.5 * p;
		const sN = wN * ppp - wN * pp;

		// combine data linearly

		for ( let i = 0; i !== stride; ++ i ) {

			result[ i ] =
					sP * values[ oP + i ] +
					s0 * values[ o0 + i ] +
					s1 * values[ o1 + i ] +
					sN * values[ oN + i ];

		}

		return result;

	}

}

class LinearInterpolant extends Interpolant {

	constructor( parameterPositions, sampleValues, sampleSize, resultBuffer ) {

		super( parameterPositions, sampleValues, sampleSize, resultBuffer );

	}

	interpolate_( i1, t0, t, t1 ) {

		const result = this.resultBuffer,
			values = this.sampleValues,
			stride = this.valueSize,

			offset1 = i1 * stride,
			offset0 = offset1 - stride,

			weight1 = ( t - t0 ) / ( t1 - t0 ),
			weight0 = 1 - weight1;

		for ( let i = 0; i !== stride; ++ i ) {

			result[ i ] =
					values[ offset0 + i ] * weight0 +
					values[ offset1 + i ] * weight1;

		}

		return result;

	}

}

/**
 *
 * Interpolant that evaluates to the sample value at the position preceding
 * the parameter.
 */

class DiscreteInterpolant extends Interpolant {

	constructor( parameterPositions, sampleValues, sampleSize, resultBuffer ) {

		super( parameterPositions, sampleValues, sampleSize, resultBuffer );

	}

	interpolate_( i1 /*, t0, t, t1 */ ) {

		return this.copySampleValue_( i1 - 1 );

	}

}

class KeyframeTrack {

	constructor( name, times, values, interpolation ) {

		if ( name === undefined ) throw new Error( 'THREE.KeyframeTrack: track name is undefined' );
		if ( times === undefined || times.length === 0 ) throw new Error( 'THREE.KeyframeTrack: no keyframes in track named ' + name );

		this.name = name;

		this.times = convertArray( times, this.TimeBufferType );
		this.values = convertArray( values, this.ValueBufferType );

		this.setInterpolation( interpolation || this.DefaultInterpolation );

	}

	// Serialization (in static context, because of constructor invocation
	// and automatic invocation of .toJSON):

	static toJSON( track ) {

		const trackType = track.constructor;

		let json;

		// derived classes can define a static toJSON method
		if ( trackType.toJSON !== this.toJSON ) {

			json = trackType.toJSON( track );

		} else {

			// by default, we assume the data can be serialized as-is
			json = {

				'name': track.name,
				'times': convertArray( track.times, Array ),
				'values': convertArray( track.values, Array )

			};

			const interpolation = track.getInterpolation();

			if ( interpolation !== track.DefaultInterpolation ) {

				json.interpolation = interpolation;

			}

		}

		json.type = track.ValueTypeName; // mandatory

		return json;

	}

	InterpolantFactoryMethodDiscrete( result ) {

		return new DiscreteInterpolant( this.times, this.values, this.getValueSize(), result );

	}

	InterpolantFactoryMethodLinear( result ) {

		return new LinearInterpolant( this.times, this.values, this.getValueSize(), result );

	}

	InterpolantFactoryMethodSmooth( result ) {

		return new CubicInterpolant( this.times, this.values, this.getValueSize(), result );

	}

	setInterpolation( interpolation ) {

		let factoryMethod;

		switch ( interpolation ) {

			case InterpolateDiscrete:

				factoryMethod = this.InterpolantFactoryMethodDiscrete;

				break;

			case InterpolateLinear:

				factoryMethod = this.InterpolantFactoryMethodLinear;

				break;

			case InterpolateSmooth:

				factoryMethod = this.InterpolantFactoryMethodSmooth;

				break;

		}

		if ( factoryMethod === undefined ) {

			const message = 'unsupported interpolation for ' +
				this.ValueTypeName + ' keyframe track named ' + this.name;

			if ( this.createInterpolant === undefined ) {

				// fall back to default, unless the default itself is messed up
				if ( interpolation !== this.DefaultInterpolation ) {

					this.setInterpolation( this.DefaultInterpolation );

				} else {

					throw new Error( message ); // fatal, in this case

				}

			}

			console.warn( 'THREE.KeyframeTrack:', message );
			return this;

		}

		this.createInterpolant = factoryMethod;

		return this;

	}

	getInterpolation() {

		switch ( this.createInterpolant ) {

			case this.InterpolantFactoryMethodDiscrete:

				return InterpolateDiscrete;

			case this.InterpolantFactoryMethodLinear:

				return InterpolateLinear;

			case this.InterpolantFactoryMethodSmooth:

				return InterpolateSmooth;

		}

	}

	getValueSize() {

		return this.values.length / this.times.length;

	}

	// move all keyframes either forwards or backwards in time
	shift( timeOffset ) {

		if ( timeOffset !== 0.0 ) {

			const times = this.times;

			for ( let i = 0, n = times.length; i !== n; ++ i ) {

				times[ i ] += timeOffset;

			}

		}

		return this;

	}

	// scale all keyframe times by a factor (useful for frame <-> seconds conversions)
	scale( timeScale ) {

		if ( timeScale !== 1.0 ) {

			const times = this.times;

			for ( let i = 0, n = times.length; i !== n; ++ i ) {

				times[ i ] *= timeScale;

			}

		}

		return this;

	}

	// removes keyframes before and after animation without changing any values within the range [startTime, endTime].
	// IMPORTANT: We do not shift around keys to the start of the track time, because for interpolated keys this will change their values
	trim( startTime, endTime ) {

		const times = this.times,
			nKeys = times.length;

		let from = 0,
			to = nKeys - 1;

		while ( from !== nKeys && times[ from ] < startTime ) {

			++ from;

		}

		while ( to !== - 1 && times[ to ] > endTime ) {

			-- to;

		}

		++ to; // inclusive -> exclusive bound

		if ( from !== 0 || to !== nKeys ) {

			// empty tracks are forbidden, so keep at least one keyframe
			if ( from >= to ) {

				to = Math.max( to, 1 );
				from = to - 1;

			}

			const stride = this.getValueSize();
			this.times = times.slice( from, to );
			this.values = this.values.slice( from * stride, to * stride );

		}

		return this;

	}

	// ensure we do not get a GarbageInGarbageOut situation, make sure tracks are at least minimally viable
	validate() {

		let valid = true;

		const valueSize = this.getValueSize();
		if ( valueSize - Math.floor( valueSize ) !== 0 ) {

			console.error( 'THREE.KeyframeTrack: Invalid value size in track.', this );
			valid = false;

		}

		const times = this.times,
			values = this.values,

			nKeys = times.length;

		if ( nKeys === 0 ) {

			console.error( 'THREE.KeyframeTrack: Track is empty.', this );
			valid = false;

		}

		let prevTime = null;

		for ( let i = 0; i !== nKeys; i ++ ) {

			const currTime = times[ i ];

			if ( typeof currTime === 'number' && isNaN( currTime ) ) {

				console.error( 'THREE.KeyframeTrack: Time is not a valid number.', this, i, currTime );
				valid = false;
				break;

			}

			if ( prevTime !== null && prevTime > currTime ) {

				console.error( 'THREE.KeyframeTrack: Out of order keys.', this, i, currTime, prevTime );
				valid = false;
				break;

			}

			prevTime = currTime;

		}

		if ( values !== undefined ) {

			if ( isTypedArray( values ) ) {

				for ( let i = 0, n = values.length; i !== n; ++ i ) {

					const value = values[ i ];

					if ( isNaN( value ) ) {

						console.error( 'THREE.KeyframeTrack: Value is not a valid number.', this, i, value );
						valid = false;
						break;

					}

				}

			}

		}

		return valid;

	}

	// removes equivalent sequential keys as common in morph target sequences
	// (0,0,0,0,1,1,1,0,0,0,0,0,0,0) --> (0,0,1,1,0,0)
	optimize() {

		// times or values may be shared with other tracks, so overwriting is unsafe
		const times = this.times.slice(),
			values = this.values.slice(),
			stride = this.getValueSize(),

			smoothInterpolation = this.getInterpolation() === InterpolateSmooth,

			lastIndex = times.length - 1;

		let writeIndex = 1;

		for ( let i = 1; i < lastIndex; ++ i ) {

			let keep = false;

			const time = times[ i ];
			const timeNext = times[ i + 1 ];

			// remove adjacent keyframes scheduled at the same time

			if ( time !== timeNext && ( i !== 1 || time !== times[ 0 ] ) ) {

				if ( ! smoothInterpolation ) {

					// remove unnecessary keyframes same as their neighbors

					const offset = i * stride,
						offsetP = offset - stride,
						offsetN = offset + stride;

					for ( let j = 0; j !== stride; ++ j ) {

						const value = values[ offset + j ];

						if ( value !== values[ offsetP + j ] ||
							value !== values[ offsetN + j ] ) {

							keep = true;
							break;

						}

					}

				} else {

					keep = true;

				}

			}

			// in-place compaction

			if ( keep ) {

				if ( i !== writeIndex ) {

					times[ writeIndex ] = times[ i ];

					const readOffset = i * stride,
						writeOffset = writeIndex * stride;

					for ( let j = 0; j !== stride; ++ j ) {

						values[ writeOffset + j ] = values[ readOffset + j ];

					}

				}

				++ writeIndex;

			}

		}

		// flush last keyframe (compaction looks ahead)

		if ( lastIndex > 0 ) {

			times[ writeIndex ] = times[ lastIndex ];

			for ( let readOffset = lastIndex * stride, writeOffset = writeIndex * stride, j = 0; j !== stride; ++ j ) {

				values[ writeOffset + j ] = values[ readOffset + j ];

			}

			++ writeIndex;

		}

		if ( writeIndex !== times.length ) {

			this.times = times.slice( 0, writeIndex );
			this.values = values.slice( 0, writeIndex * stride );

		} else {

			this.times = times;
			this.values = values;

		}

		return this;

	}

	clone() {

		const times = this.times.slice();
		const values = this.values.slice();

		const TypedKeyframeTrack = this.constructor;
		const track = new TypedKeyframeTrack( this.name, times, values );

		// Interpolant argument to constructor is not saved, so copy the factory method directly.
		track.createInterpolant = this.createInterpolant;

		return track;

	}

}

KeyframeTrack.prototype.TimeBufferType = Float32Array;
KeyframeTrack.prototype.ValueBufferType = Float32Array;
KeyframeTrack.prototype.DefaultInterpolation = InterpolateLinear;

/**
 * A Track of Boolean keyframe values.
 */
class BooleanKeyframeTrack extends KeyframeTrack {

	// No interpolation parameter because only InterpolateDiscrete is valid.
	constructor( name, times, values ) {

		super( name, times, values );

	}

}

BooleanKeyframeTrack.prototype.ValueTypeName = 'bool';
BooleanKeyframeTrack.prototype.ValueBufferType = Array;
BooleanKeyframeTrack.prototype.DefaultInterpolation = InterpolateDiscrete;
BooleanKeyframeTrack.prototype.InterpolantFactoryMethodLinear = undefined;
BooleanKeyframeTrack.prototype.InterpolantFactoryMethodSmooth = undefined;

/**
 * A Track of keyframe values that represent color.
 */
class ColorKeyframeTrack extends KeyframeTrack {}

ColorKeyframeTrack.prototype.ValueTypeName = 'color';

/**
 * A Track of numeric keyframe values.
 */
class NumberKeyframeTrack extends KeyframeTrack {}

NumberKeyframeTrack.prototype.ValueTypeName = 'number';

/**
 * Spherical linear unit quaternion interpolant.
 */

class QuaternionLinearInterpolant extends Interpolant {

	constructor( parameterPositions, sampleValues, sampleSize, resultBuffer ) {

		super( parameterPositions, sampleValues, sampleSize, resultBuffer );

	}

	interpolate_( i1, t0, t, t1 ) {

		const result = this.resultBuffer,
			values = this.sampleValues,
			stride = this.valueSize,

			alpha = ( t - t0 ) / ( t1 - t0 );

		let offset = i1 * stride;

		for ( let end = offset + stride; offset !== end; offset += 4 ) {

			Quaternion.slerpFlat( result, 0, values, offset - stride, values, offset, alpha );

		}

		return result;

	}

}

/**
 * A Track of quaternion keyframe values.
 */
class QuaternionKeyframeTrack extends KeyframeTrack {

	InterpolantFactoryMethodLinear( result ) {

		return new QuaternionLinearInterpolant( this.times, this.values, this.getValueSize(), result );

	}

}

QuaternionKeyframeTrack.prototype.ValueTypeName = 'quaternion';
// ValueBufferType is inherited
// DefaultInterpolation is inherited;
QuaternionKeyframeTrack.prototype.InterpolantFactoryMethodSmooth = undefined;

/**
 * A Track that interpolates Strings
 */
class StringKeyframeTrack extends KeyframeTrack {

	// No interpolation parameter because only InterpolateDiscrete is valid.
	constructor( name, times, values ) {

		super( name, times, values );

	}

}

StringKeyframeTrack.prototype.ValueTypeName = 'string';
StringKeyframeTrack.prototype.ValueBufferType = Array;
StringKeyframeTrack.prototype.DefaultInterpolation = InterpolateDiscrete;
StringKeyframeTrack.prototype.InterpolantFactoryMethodLinear = undefined;
StringKeyframeTrack.prototype.InterpolantFactoryMethodSmooth = undefined;

/**
 * A Track of vectored keyframe values.
 */
class VectorKeyframeTrack extends KeyframeTrack {}

VectorKeyframeTrack.prototype.ValueTypeName = 'vector';

class AnimationClip {

	constructor( name = '', duration = - 1, tracks = [], blendMode = NormalAnimationBlendMode ) {

		this.name = name;
		this.tracks = tracks;
		this.duration = duration;
		this.blendMode = blendMode;

		this.uuid = generateUUID();

		// this means it should figure out its duration by scanning the tracks
		if ( this.duration < 0 ) {

			this.resetDuration();

		}

	}


	static parse( json ) {

		const tracks = [],
			jsonTracks = json.tracks,
			frameTime = 1.0 / ( json.fps || 1.0 );

		for ( let i = 0, n = jsonTracks.length; i !== n; ++ i ) {

			tracks.push( parseKeyframeTrack( jsonTracks[ i ] ).scale( frameTime ) );

		}

		const clip = new this( json.name, json.duration, tracks, json.blendMode );
		clip.uuid = json.uuid;

		return clip;

	}

	static toJSON( clip ) {

		const tracks = [],
			clipTracks = clip.tracks;

		const json = {

			'name': clip.name,
			'duration': clip.duration,
			'tracks': tracks,
			'uuid': clip.uuid,
			'blendMode': clip.blendMode

		};

		for ( let i = 0, n = clipTracks.length; i !== n; ++ i ) {

			tracks.push( KeyframeTrack.toJSON( clipTracks[ i ] ) );

		}

		return json;

	}

	static CreateFromMorphTargetSequence( name, morphTargetSequence, fps, noLoop ) {

		const numMorphTargets = morphTargetSequence.length;
		const tracks = [];

		for ( let i = 0; i < numMorphTargets; i ++ ) {

			let times = [];
			let values = [];

			times.push(
				( i + numMorphTargets - 1 ) % numMorphTargets,
				i,
				( i + 1 ) % numMorphTargets );

			values.push( 0, 1, 0 );

			const order = getKeyframeOrder( times );
			times = sortedArray( times, 1, order );
			values = sortedArray( values, 1, order );

			// if there is a key at the first frame, duplicate it as the
			// last frame as well for perfect loop.
			if ( ! noLoop && times[ 0 ] === 0 ) {

				times.push( numMorphTargets );
				values.push( values[ 0 ] );

			}

			tracks.push(
				new NumberKeyframeTrack(
					'.morphTargetInfluences[' + morphTargetSequence[ i ].name + ']',
					times, values
				).scale( 1.0 / fps ) );

		}

		return new this( name, - 1, tracks );

	}

	static findByName( objectOrClipArray, name ) {

		let clipArray = objectOrClipArray;

		if ( ! Array.isArray( objectOrClipArray ) ) {

			const o = objectOrClipArray;
			clipArray = o.geometry && o.geometry.animations || o.animations;

		}

		for ( let i = 0; i < clipArray.length; i ++ ) {

			if ( clipArray[ i ].name === name ) {

				return clipArray[ i ];

			}

		}

		return null;

	}

	static CreateClipsFromMorphTargetSequences( morphTargets, fps, noLoop ) {

		const animationToMorphTargets = {};

		// tested with https://regex101.com/ on trick sequences
		// such flamingo_flyA_003, flamingo_run1_003, crdeath0059
		const pattern = /^([\w-]*?)([\d]+)$/;

		// sort morph target names into animation groups based
		// patterns like Walk_001, Walk_002, Run_001, Run_002
		for ( let i = 0, il = morphTargets.length; i < il; i ++ ) {

			const morphTarget = morphTargets[ i ];
			const parts = morphTarget.name.match( pattern );

			if ( parts && parts.length > 1 ) {

				const name = parts[ 1 ];

				let animationMorphTargets = animationToMorphTargets[ name ];

				if ( ! animationMorphTargets ) {

					animationToMorphTargets[ name ] = animationMorphTargets = [];

				}

				animationMorphTargets.push( morphTarget );

			}

		}

		const clips = [];

		for ( const name in animationToMorphTargets ) {

			clips.push( this.CreateFromMorphTargetSequence( name, animationToMorphTargets[ name ], fps, noLoop ) );

		}

		return clips;

	}

	// parse the animation.hierarchy format
	static parseAnimation( animation, bones ) {

		if ( ! animation ) {

			console.error( 'THREE.AnimationClip: No animation in JSONLoader data.' );
			return null;

		}

		const addNonemptyTrack = function ( trackType, trackName, animationKeys, propertyName, destTracks ) {

			// only return track if there are actually keys.
			if ( animationKeys.length !== 0 ) {

				const times = [];
				const values = [];

				flattenJSON( animationKeys, times, values, propertyName );

				// empty keys are filtered out, so check again
				if ( times.length !== 0 ) {

					destTracks.push( new trackType( trackName, times, values ) );

				}

			}

		};

		const tracks = [];

		const clipName = animation.name || 'default';
		const fps = animation.fps || 30;
		const blendMode = animation.blendMode;

		// automatic length determination in AnimationClip.
		let duration = animation.length || - 1;

		const hierarchyTracks = animation.hierarchy || [];

		for ( let h = 0; h < hierarchyTracks.length; h ++ ) {

			const animationKeys = hierarchyTracks[ h ].keys;

			// skip empty tracks
			if ( ! animationKeys || animationKeys.length === 0 ) continue;

			// process morph targets
			if ( animationKeys[ 0 ].morphTargets ) {

				// figure out all morph targets used in this track
				const morphTargetNames = {};

				let k;

				for ( k = 0; k < animationKeys.length; k ++ ) {

					if ( animationKeys[ k ].morphTargets ) {

						for ( let m = 0; m < animationKeys[ k ].morphTargets.length; m ++ ) {

							morphTargetNames[ animationKeys[ k ].morphTargets[ m ] ] = - 1;

						}

					}

				}

				// create a track for each morph target with all zero
				// morphTargetInfluences except for the keys in which
				// the morphTarget is named.
				for ( const morphTargetName in morphTargetNames ) {

					const times = [];
					const values = [];

					for ( let m = 0; m !== animationKeys[ k ].morphTargets.length; ++ m ) {

						const animationKey = animationKeys[ k ];

						times.push( animationKey.time );
						values.push( ( animationKey.morphTarget === morphTargetName ) ? 1 : 0 );

					}

					tracks.push( new NumberKeyframeTrack( '.morphTargetInfluence[' + morphTargetName + ']', times, values ) );

				}

				duration = morphTargetNames.length * fps;

			} else {

				// ...assume skeletal animation

				const boneName = '.bones[' + bones[ h ].name + ']';

				addNonemptyTrack(
					VectorKeyframeTrack, boneName + '.position',
					animationKeys, 'pos', tracks );

				addNonemptyTrack(
					QuaternionKeyframeTrack, boneName + '.quaternion',
					animationKeys, 'rot', tracks );

				addNonemptyTrack(
					VectorKeyframeTrack, boneName + '.scale',
					animationKeys, 'scl', tracks );

			}

		}

		if ( tracks.length === 0 ) {

			return null;

		}

		const clip = new this( clipName, duration, tracks, blendMode );

		return clip;

	}

	resetDuration() {

		const tracks = this.tracks;
		let duration = 0;

		for ( let i = 0, n = tracks.length; i !== n; ++ i ) {

			const track = this.tracks[ i ];

			duration = Math.max( duration, track.times[ track.times.length - 1 ] );

		}

		this.duration = duration;

		return this;

	}

	trim() {

		for ( let i = 0; i < this.tracks.length; i ++ ) {

			this.tracks[ i ].trim( 0, this.duration );

		}

		return this;

	}

	validate() {

		let valid = true;

		for ( let i = 0; i < this.tracks.length; i ++ ) {

			valid = valid && this.tracks[ i ].validate();

		}

		return valid;

	}

	optimize() {

		for ( let i = 0; i < this.tracks.length; i ++ ) {

			this.tracks[ i ].optimize();

		}

		return this;

	}

	clone() {

		const tracks = [];

		for ( let i = 0; i < this.tracks.length; i ++ ) {

			tracks.push( this.tracks[ i ].clone() );

		}

		return new this.constructor( this.name, this.duration, tracks, this.blendMode );

	}

	toJSON() {

		return this.constructor.toJSON( this );

	}

}

function getTrackTypeForValueTypeName( typeName ) {

	switch ( typeName.toLowerCase() ) {

		case 'scalar':
		case 'double':
		case 'float':
		case 'number':
		case 'integer':

			return NumberKeyframeTrack;

		case 'vector':
		case 'vector2':
		case 'vector3':
		case 'vector4':

			return VectorKeyframeTrack;

		case 'color':

			return ColorKeyframeTrack;

		case 'quaternion':

			return QuaternionKeyframeTrack;

		case 'bool':
		case 'boolean':

			return BooleanKeyframeTrack;

		case 'string':

			return StringKeyframeTrack;

	}

	throw new Error( 'THREE.KeyframeTrack: Unsupported typeName: ' + typeName );

}

function parseKeyframeTrack( json ) {

	if ( json.type === undefined ) {

		throw new Error( 'THREE.KeyframeTrack: track type undefined, can not parse' );

	}

	const trackType = getTrackTypeForValueTypeName( json.type );

	if ( json.times === undefined ) {

		const times = [], values = [];

		flattenJSON( json.keys, times, values, 'value' );

		json.times = times;
		json.values = values;

	}

	// derived classes can define a static parse method
	if ( trackType.parse !== undefined ) {

		return trackType.parse( json );

	} else {

		// by default, we assume a constructor compatible with the base
		return new trackType( json.name, json.times, json.values, json.interpolation );

	}

}

const Cache = {

	enabled: false,

	files: {},

	add: function ( key, file ) {

		if ( this.enabled === false ) return;

		// console.log( 'THREE.Cache', 'Adding key:', key );

		this.files[ key ] = file;

	},

	get: function ( key ) {

		if ( this.enabled === false ) return;

		// console.log( 'THREE.Cache', 'Checking key:', key );

		return this.files[ key ];

	},

	remove: function ( key ) {

		delete this.files[ key ];

	},

	clear: function () {

		this.files = {};

	}

};

class LoadingManager {

	constructor( onLoad, onProgress, onError ) {

		const scope = this;

		let isLoading = false;
		let itemsLoaded = 0;
		let itemsTotal = 0;
		let urlModifier = undefined;
		const handlers = [];

		// Refer to #5689 for the reason why we don't set .onStart
		// in the constructor

		this.onStart = undefined;
		this.onLoad = onLoad;
		this.onProgress = onProgress;
		this.onError = onError;

		this.itemStart = function ( url ) {

			itemsTotal ++;

			if ( isLoading === false ) {

				if ( scope.onStart !== undefined ) {

					scope.onStart( url, itemsLoaded, itemsTotal );

				}

			}

			isLoading = true;

		};

		this.itemEnd = function ( url ) {

			itemsLoaded ++;

			if ( scope.onProgress !== undefined ) {

				scope.onProgress( url, itemsLoaded, itemsTotal );

			}

			if ( itemsLoaded === itemsTotal ) {

				isLoading = false;

				if ( scope.onLoad !== undefined ) {

					scope.onLoad();

				}

			}

		};

		this.itemError = function ( url ) {

			if ( scope.onError !== undefined ) {

				scope.onError( url );

			}

		};

		this.resolveURL = function ( url ) {

			if ( urlModifier ) {

				return urlModifier( url );

			}

			return url;

		};

		this.setURLModifier = function ( transform ) {

			urlModifier = transform;

			return this;

		};

		this.addHandler = function ( regex, loader ) {

			handlers.push( regex, loader );

			return this;

		};

		this.removeHandler = function ( regex ) {

			const index = handlers.indexOf( regex );

			if ( index !== - 1 ) {

				handlers.splice( index, 2 );

			}

			return this;

		};

		this.getHandler = function ( file ) {

			for ( let i = 0, l = handlers.length; i < l; i += 2 ) {

				const regex = handlers[ i ];
				const loader = handlers[ i + 1 ];

				if ( regex.global ) regex.lastIndex = 0; // see #17920

				if ( regex.test( file ) ) {

					return loader;

				}

			}

			return null;

		};

	}

}

const DefaultLoadingManager = /*@__PURE__*/ new LoadingManager();

class Loader {

	constructor( manager ) {

		this.manager = ( manager !== undefined ) ? manager : DefaultLoadingManager;

		this.crossOrigin = 'anonymous';
		this.withCredentials = false;
		this.path = '';
		this.resourcePath = '';
		this.requestHeader = {};

	}

	load( /* url, onLoad, onProgress, onError */ ) {}

	loadAsync( url, onProgress ) {

		const scope = this;

		return new Promise( function ( resolve, reject ) {

			scope.load( url, resolve, onProgress, reject );

		} );

	}

	parse( /* data */ ) {}

	setCrossOrigin( crossOrigin ) {

		this.crossOrigin = crossOrigin;
		return this;

	}

	setWithCredentials( value ) {

		this.withCredentials = value;
		return this;

	}

	setPath( path ) {

		this.path = path;
		return this;

	}

	setResourcePath( resourcePath ) {

		this.resourcePath = resourcePath;
		return this;

	}

	setRequestHeader( requestHeader ) {

		this.requestHeader = requestHeader;
		return this;

	}

}

Loader.DEFAULT_MATERIAL_NAME = '__DEFAULT';

const loading = {};

class HttpError extends Error {

	constructor( message, response ) {

		super( message );
		this.response = response;

	}

}

class FileLoader extends Loader {

	constructor( manager ) {

		super( manager );

	}

	load( url, onLoad, onProgress, onError ) {

		if ( url === undefined ) url = '';

		if ( this.path !== undefined ) url = this.path + url;

		url = this.manager.resolveURL( url );

		const cached = Cache.get( url );

		if ( cached !== undefined ) {

			this.manager.itemStart( url );

			setTimeout( () => {

				if ( onLoad ) onLoad( cached );

				this.manager.itemEnd( url );

			}, 0 );

			return cached;

		}

		// Check if request is duplicate

		if ( loading[ url ] !== undefined ) {

			loading[ url ].push( {

				onLoad: onLoad,
				onProgress: onProgress,
				onError: onError

			} );

			return;

		}

		// Initialise array for duplicate requests
		loading[ url ] = [];

		loading[ url ].push( {
			onLoad: onLoad,
			onProgress: onProgress,
			onError: onError,
		} );

		// create request
		const req = new Request( url, {
			headers: new Headers( this.requestHeader ),
			credentials: this.withCredentials ? 'include' : 'same-origin',
			// An abort controller could be added within a future PR
		} );

		// record states ( avoid data race )
		const mimeType = this.mimeType;
		const responseType = this.responseType;

		// start the fetch
		fetch( req )
			.then( response => {

				if ( response.status === 200 || response.status === 0 ) {

					// Some browsers return HTTP Status 0 when using non-http protocol
					// e.g. 'file://' or 'data://'. Handle as success.

					if ( response.status === 0 ) {

						console.warn( 'THREE.FileLoader: HTTP Status 0 received.' );

					}

					// Workaround: Checking if response.body === undefined for Alipay browser #23548

					if ( typeof ReadableStream === 'undefined' || response.body === undefined || response.body.getReader === undefined ) {

						return response;

					}

					const callbacks = loading[ url ];
					const reader = response.body.getReader();

					// Nginx needs X-File-Size check
					// https://serverfault.com/questions/482875/why-does-nginx-remove-content-length-header-for-chunked-content
					const contentLength = response.headers.get( 'X-File-Size' ) || response.headers.get( 'Content-Length' );
					const total = contentLength ? parseInt( contentLength ) : 0;
					const lengthComputable = total !== 0;
					let loaded = 0;

					// periodically read data into the new stream tracking while download progress
					const stream = new ReadableStream( {
						start( controller ) {

							readData();

							function readData() {

								reader.read().then( ( { done, value } ) => {

									if ( done ) {

										controller.close();

									} else {

										loaded += value.byteLength;

										const event = new ProgressEvent( 'progress', { lengthComputable, loaded, total } );
										for ( let i = 0, il = callbacks.length; i < il; i ++ ) {

											const callback = callbacks[ i ];
											if ( callback.onProgress ) callback.onProgress( event );

										}

										controller.enqueue( value );
										readData();

									}

								}, ( e ) => {

									controller.error( e );

								} );

							}

						}

					} );

					return new Response( stream );

				} else {

					throw new HttpError( `fetch for "${response.url}" responded with ${response.status}: ${response.statusText}`, response );

				}

			} )
			.then( response => {

				switch ( responseType ) {

					case 'arraybuffer':

						return response.arrayBuffer();

					case 'blob':

						return response.blob();

					case 'document':

						return response.text()
							.then( text => {

								const parser = new DOMParser();
								return parser.parseFromString( text, mimeType );

							} );

					case 'json':

						return response.json();

					default:

						if ( mimeType === undefined ) {

							return response.text();

						} else {

							// sniff encoding
							const re = /charset="?([^;"\s]*)"?/i;
							const exec = re.exec( mimeType );
							const label = exec && exec[ 1 ] ? exec[ 1 ].toLowerCase() : undefined;
							const decoder = new TextDecoder( label );
							return response.arrayBuffer().then( ab => decoder.decode( ab ) );

						}

				}

			} )
			.then( data => {

				// Add to cache only on HTTP success, so that we do not cache
				// error response bodies as proper responses to requests.
				Cache.add( url, data );

				const callbacks = loading[ url ];
				delete loading[ url ];

				for ( let i = 0, il = callbacks.length; i < il; i ++ ) {

					const callback = callbacks[ i ];
					if ( callback.onLoad ) callback.onLoad( data );

				}

			} )
			.catch( err => {

				// Abort errors and other errors are handled the same

				const callbacks = loading[ url ];

				if ( callbacks === undefined ) {

					// When onLoad was called and url was deleted in `loading`
					this.manager.itemError( url );
					throw err;

				}

				delete loading[ url ];

				for ( let i = 0, il = callbacks.length; i < il; i ++ ) {

					const callback = callbacks[ i ];
					if ( callback.onError ) callback.onError( err );

				}

				this.manager.itemError( url );

			} )
			.finally( () => {

				this.manager.itemEnd( url );

			} );

		this.manager.itemStart( url );

	}

	setResponseType( value ) {

		this.responseType = value;
		return this;

	}

	setMimeType( value ) {

		this.mimeType = value;
		return this;

	}

}

class AnimationLoader extends Loader {

	constructor( manager ) {

		super( manager );

	}

	load( url, onLoad, onProgress, onError ) {

		const scope = this;

		const loader = new FileLoader( this.manager );
		loader.setPath( this.path );
		loader.setRequestHeader( this.requestHeader );
		loader.setWithCredentials( this.withCredentials );
		loader.load( url, function ( text ) {

			try {

				onLoad( scope.parse( JSON.parse( text ) ) );

			} catch ( e ) {

				if ( onError ) {

					onError( e );

				} else {

					console.error( e );

				}

				scope.manager.itemError( url );

			}

		}, onProgress, onError );

	}

	parse( json ) {

		const animations = [];

		for ( let i = 0; i < json.length; i ++ ) {

			const clip = AnimationClip.parse( json[ i ] );

			animations.push( clip );

		}

		return animations;

	}

}

/**
 * Abstract Base class to block based textures loader (dds, pvr, ...)
 *
 * Sub classes have to implement the parse() method which will be used in load().
 */

class CompressedTextureLoader extends Loader {

	constructor( manager ) {

		super( manager );

	}

	load( url, onLoad, onProgress, onError ) {

		const scope = this;

		const images = [];

		const texture = new CompressedTexture();

		const loader = new FileLoader( this.manager );
		loader.setPath( this.path );
		loader.setResponseType( 'arraybuffer' );
		loader.setRequestHeader( this.requestHeader );
		loader.setWithCredentials( scope.withCredentials );

		let loaded = 0;

		function loadTexture( i ) {

			loader.load( url[ i ], function ( buffer ) {

				const texDatas = scope.parse( buffer, true );

				images[ i ] = {
					width: texDatas.width,
					height: texDatas.height,
					format: texDatas.format,
					mipmaps: texDatas.mipmaps
				};

				loaded += 1;

				if ( loaded === 6 ) {

					if ( texDatas.mipmapCount === 1 ) texture.minFilter = LinearFilter;

					texture.image = images;
					texture.format = texDatas.format;
					texture.needsUpdate = true;

					if ( onLoad ) onLoad( texture );

				}

			}, onProgress, onError );

		}

		if ( Array.isArray( url ) ) {

			for ( let i = 0, il = url.length; i < il; ++ i ) {

				loadTexture( i );

			}

		} else {

			// compressed cubemap texture stored in a single DDS file

			loader.load( url, function ( buffer ) {

				const texDatas = scope.parse( buffer, true );

				if ( texDatas.isCubemap ) {

					const faces = texDatas.mipmaps.length / texDatas.mipmapCount;

					for ( let f = 0; f < faces; f ++ ) {

						images[ f ] = { mipmaps: [] };

						for ( let i = 0; i < texDatas.mipmapCount; i ++ ) {

							images[ f ].mipmaps.push( texDatas.mipmaps[ f * texDatas.mipmapCount + i ] );
							images[ f ].format = texDatas.format;
							images[ f ].width = texDatas.width;
							images[ f ].height = texDatas.height;

						}

					}

					texture.image = images;

				} else {

					texture.image.width = texDatas.width;
					texture.image.height = texDatas.height;
					texture.mipmaps = texDatas.mipmaps;

				}

				if ( texDatas.mipmapCount === 1 ) {

					texture.minFilter = LinearFilter;

				}

				texture.format = texDatas.format;
				texture.needsUpdate = true;

				if ( onLoad ) onLoad( texture );

			}, onProgress, onError );

		}

		return texture;

	}

}

class ImageLoader extends Loader {

	constructor( manager ) {

		super( manager );

	}

	load( url, onLoad, onProgress, onError ) {

		if ( this.path !== undefined ) url = this.path + url;

		url = this.manager.resolveURL( url );

		const scope = this;

		const cached = Cache.get( url );

		if ( cached !== undefined ) {

			scope.manager.itemStart( url );

			setTimeout( function () {

				if ( onLoad ) onLoad( cached );

				scope.manager.itemEnd( url );

			}, 0 );

			return cached;

		}

		const image = createElementNS( 'img' );

		function onImageLoad() {

			removeEventListeners();

			Cache.add( url, this );

			if ( onLoad ) onLoad( this );

			scope.manager.itemEnd( url );

		}

		function onImageError( event ) {

			removeEventListeners();

			if ( onError ) onError( event );

			scope.manager.itemError( url );
			scope.manager.itemEnd( url );

		}

		function removeEventListeners() {

			image.removeEventListener( 'load', onImageLoad, false );
			image.removeEventListener( 'error', onImageError, false );

		}

		image.addEventListener( 'load', onImageLoad, false );
		image.addEventListener( 'error', onImageError, false );

		if ( url.slice( 0, 5 ) !== 'data:' ) {

			if ( this.crossOrigin !== undefined ) image.crossOrigin = this.crossOrigin;

		}

		scope.manager.itemStart( url );

		image.src = url;

		return image;

	}

}

class CubeTextureLoader extends Loader {

	constructor( manager ) {

		super( manager );

	}

	load( urls, onLoad, onProgress, onError ) {

		const texture = new CubeTexture();
		texture.colorSpace = SRGBColorSpace;

		const loader = new ImageLoader( this.manager );
		loader.setCrossOrigin( this.crossOrigin );
		loader.setPath( this.path );

		let loaded = 0;

		function loadTexture( i ) {

			loader.load( urls[ i ], function ( image ) {

				texture.images[ i ] = image;

				loaded ++;

				if ( loaded === 6 ) {

					texture.needsUpdate = true;

					if ( onLoad ) onLoad( texture );

				}

			}, undefined, onError );

		}

		for ( let i = 0; i < urls.length; ++ i ) {

			loadTexture( i );

		}

		return texture;

	}

}

/**
 * Abstract Base class to load generic binary textures formats (rgbe, hdr, ...)
 *
 * Sub classes have to implement the parse() method which will be used in load().
 */

class DataTextureLoader extends Loader {

	constructor( manager ) {

		super( manager );

	}

	load( url, onLoad, onProgress, onError ) {

		const scope = this;

		const texture = new DataTexture();

		const loader = new FileLoader( this.manager );
		loader.setResponseType( 'arraybuffer' );
		loader.setRequestHeader( this.requestHeader );
		loader.setPath( this.path );
		loader.setWithCredentials( scope.withCredentials );
		loader.load( url, function ( buffer ) {

			let texData;

			try {

				texData = scope.parse( buffer );

			} catch ( error ) {

				if ( onError !== undefined ) {

					onError( error );

				} else {

					console.error( error );
					return;

				}

			}

			if ( texData.image !== undefined ) {

				texture.image = texData.image;

			} else if ( texData.data !== undefined ) {

				texture.image.width = texData.width;
				texture.image.height = texData.height;
				texture.image.data = texData.data;

			}

			texture.wrapS = texData.wrapS !== undefined ? texData.wrapS : ClampToEdgeWrapping;
			texture.wrapT = texData.wrapT !== undefined ? texData.wrapT : ClampToEdgeWrapping;

			texture.magFilter = texData.magFilter !== undefined ? texData.magFilter : LinearFilter;
			texture.minFilter = texData.minFilter !== undefined ? texData.minFilter : LinearFilter;

			texture.anisotropy = texData.anisotropy !== undefined ? texData.anisotropy : 1;

			if ( texData.colorSpace !== undefined ) {

				texture.colorSpace = texData.colorSpace;

			}

			if ( texData.flipY !== undefined ) {

				texture.flipY = texData.flipY;

			}

			if ( texData.format !== undefined ) {

				texture.format = texData.format;

			}

			if ( texData.type !== undefined ) {

				texture.type = texData.type;

			}

			if ( texData.mipmaps !== undefined ) {

				texture.mipmaps = texData.mipmaps;
				texture.minFilter = LinearMipmapLinearFilter; // presumably...

			}

			if ( texData.mipmapCount === 1 ) {

				texture.minFilter = LinearFilter;

			}

			if ( texData.generateMipmaps !== undefined ) {

				texture.generateMipmaps = texData.generateMipmaps;

			}

			texture.needsUpdate = true;

			if ( onLoad ) onLoad( texture, texData );

		}, onProgress, onError );


		return texture;

	}

}

class TextureLoader extends Loader {

	constructor( manager ) {

		super( manager );

	}

	load( url, onLoad, onProgress, onError ) {

		const texture = new Texture();

		const loader = new ImageLoader( this.manager );
		loader.setCrossOrigin( this.crossOrigin );
		loader.setPath( this.path );

		loader.load( url, function ( image ) {

			texture.image = image;
			texture.needsUpdate = true;

			if ( onLoad !== undefined ) {

				onLoad( texture );

			}

		}, onProgress, onError );

		return texture;

	}

}

class Light extends Object3D {

	constructor( color, intensity = 1 ) {

		super();

		this.isLight = true;

		this.type = 'Light';

		this.color = new Color( color );
		this.intensity = intensity;

	}

	dispose() {

		// Empty here in base class; some subclasses override.

	}

	copy( source, recursive ) {

		super.copy( source, recursive );

		this.color.copy( source.color );
		this.intensity = source.intensity;

		return this;

	}

	toJSON( meta ) {

		const data = super.toJSON( meta );

		data.object.color = this.color.getHex();
		data.object.intensity = this.intensity;

		if ( this.groundColor !== undefined ) data.object.groundColor = this.groundColor.getHex();

		if ( this.distance !== undefined ) data.object.distance = this.distance;
		if ( this.angle !== undefined ) data.object.angle = this.angle;
		if ( this.decay !== undefined ) data.object.decay = this.decay;
		if ( this.penumbra !== undefined ) data.object.penumbra = this.penumbra;

		if ( this.shadow !== undefined ) data.object.shadow = this.shadow.toJSON();
		if ( this.target !== undefined ) data.object.target = this.target.uuid;

		return data;

	}

}

class HemisphereLight extends Light {

	constructor( skyColor, groundColor, intensity ) {

		super( skyColor, intensity );

		this.isHemisphereLight = true;

		this.type = 'HemisphereLight';

		this.position.copy( Object3D.DEFAULT_UP );
		this.updateMatrix();

		this.groundColor = new Color( groundColor );

	}

	copy( source, recursive ) {

		super.copy( source, recursive );

		this.groundColor.copy( source.groundColor );

		return this;

	}

}

const _projScreenMatrix$2 = /*@__PURE__*/ new Matrix4();
const _lightPositionWorld$1 = /*@__PURE__*/ new Vector3();
const _lookTarget$1 = /*@__PURE__*/ new Vector3();

class LightShadow {

	constructor( camera ) {

		this.camera = camera;

		this.intensity = 1;

		this.bias = 0;
		this.normalBias = 0;
		this.radius = 1;
		this.blurSamples = 8;

		this.mapSize = new Vector2( 512, 512 );

		this.map = null;
		this.mapPass = null;
		this.matrix = new Matrix4();

		this.autoUpdate = true;
		this.needsUpdate = false;

		this._frustum = new Frustum();
		this._frameExtents = new Vector2( 1, 1 );

		this._viewportCount = 1;

		this._viewports = [

			new Vector4( 0, 0, 1, 1 )

		];

	}

	getViewportCount() {

		return this._viewportCount;

	}

	getFrustum() {

		return this._frustum;

	}

	updateMatrices( light ) {

		const shadowCamera = this.camera;
		const shadowMatrix = this.matrix;

		_lightPositionWorld$1.setFromMatrixPosition( light.matrixWorld );
		shadowCamera.position.copy( _lightPositionWorld$1 );

		_lookTarget$1.setFromMatrixPosition( light.target.matrixWorld );
		shadowCamera.lookAt( _lookTarget$1 );
		shadowCamera.updateMatrixWorld();

		_projScreenMatrix$2.multiplyMatrices( shadowCamera.projectionMatrix, shadowCamera.matrixWorldInverse );
		this._frustum.setFromProjectionMatrix( _projScreenMatrix$2 );

		shadowMatrix.set(
			0.5, 0.0, 0.0, 0.5,
			0.0, 0.5, 0.0, 0.5,
			0.0, 0.0, 0.5, 0.5,
			0.0, 0.0, 0.0, 1.0
		);

		shadowMatrix.multiply( _projScreenMatrix$2 );

	}

	getViewport( viewportIndex ) {

		return this._viewports[ viewportIndex ];

	}

	getFrameExtents() {

		return this._frameExtents;

	}

	dispose() {

		if ( this.map ) {

			this.map.dispose();

		}

		if ( this.mapPass ) {

			this.mapPass.dispose();

		}

	}

	copy( source ) {

		this.camera = source.camera.clone();

		this.intensity = source.intensity;

		this.bias = source.bias;
		this.radius = source.radius;

		this.mapSize.copy( source.mapSize );

		return this;

	}

	clone() {

		return new this.constructor().copy( this );

	}

	toJSON() {

		const object = {};

		if ( this.intensity !== 1 ) object.intensity = this.intensity;
		if ( this.bias !== 0 ) object.bias = this.bias;
		if ( this.normalBias !== 0 ) object.normalBias = this.normalBias;
		if ( this.radius !== 1 ) object.radius = this.radius;
		if ( this.mapSize.x !== 512 || this.mapSize.y !== 512 ) object.mapSize = this.mapSize.toArray();

		object.camera = this.camera.toJSON( false ).object;
		delete object.camera.matrix;

		return object;

	}

}

class SpotLightShadow extends LightShadow {

	constructor() {

		super( new PerspectiveCamera( 50, 1, 0.5, 500 ) );

		this.isSpotLightShadow = true;

		this.focus = 1;

	}

	updateMatrices( light ) {

		const camera = this.camera;

		const fov = RAD2DEG * 2 * light.angle * this.focus;
		const aspect = this.mapSize.width / this.mapSize.height;
		const far = light.distance || camera.far;

		if ( fov !== camera.fov || aspect !== camera.aspect || far !== camera.far ) {

			camera.fov = fov;
			camera.aspect = aspect;
			camera.far = far;
			camera.updateProjectionMatrix();

		}

		super.updateMatrices( light );

	}

	copy( source ) {

		super.copy( source );

		this.focus = source.focus;

		return this;

	}

}

class SpotLight extends Light {

	constructor( color, intensity, distance = 0, angle = Math.PI / 3, penumbra = 0, decay = 2 ) {

		super( color, intensity );

		this.isSpotLight = true;

		this.type = 'SpotLight';

		this.position.copy( Object3D.DEFAULT_UP );
		this.updateMatrix();

		this.target = new Object3D();

		this.distance = distance;
		this.angle = angle;
		this.penumbra = penumbra;
		this.decay = decay;

		this.map = null;

		this.shadow = new SpotLightShadow();

	}

	get power() {

		// compute the light's luminous power (in lumens) from its intensity (in candela)
		// by convention for a spotlight, luminous power (lm) = π * luminous intensity (cd)
		return this.intensity * Math.PI;

	}

	set power( power ) {

		// set the light's intensity (in candela) from the desired luminous power (in lumens)
		this.intensity = power / Math.PI;

	}

	dispose() {

		this.shadow.dispose();

	}

	copy( source, recursive ) {

		super.copy( source, recursive );

		this.distance = source.distance;
		this.angle = source.angle;
		this.penumbra = source.penumbra;
		this.decay = source.decay;

		this.target = source.target.clone();

		this.shadow = source.shadow.clone();

		return this;

	}

}

const _projScreenMatrix$1 = /*@__PURE__*/ new Matrix4();
const _lightPositionWorld = /*@__PURE__*/ new Vector3();
const _lookTarget = /*@__PURE__*/ new Vector3();

class PointLightShadow extends LightShadow {

	constructor() {

		super( new PerspectiveCamera( 90, 1, 0.5, 500 ) );

		this.isPointLightShadow = true;

		this._frameExtents = new Vector2( 4, 2 );

		this._viewportCount = 6;

		this._viewports = [
			// These viewports map a cube-map onto a 2D texture with the
			// following orientation:
			//
			//  xzXZ
			//   y Y
			//
			// X - Positive x direction
			// x - Negative x direction
			// Y - Positive y direction
			// y - Negative y direction
			// Z - Positive z direction
			// z - Negative z direction

			// positive X
			new Vector4( 2, 1, 1, 1 ),
			// negative X
			new Vector4( 0, 1, 1, 1 ),
			// positive Z
			new Vector4( 3, 1, 1, 1 ),
			// negative Z
			new Vector4( 1, 1, 1, 1 ),
			// positive Y
			new Vector4( 3, 0, 1, 1 ),
			// negative Y
			new Vector4( 1, 0, 1, 1 )
		];

		this._cubeDirections = [
			new Vector3( 1, 0, 0 ), new Vector3( - 1, 0, 0 ), new Vector3( 0, 0, 1 ),
			new Vector3( 0, 0, - 1 ), new Vector3( 0, 1, 0 ), new Vector3( 0, - 1, 0 )
		];

		this._cubeUps = [
			new Vector3( 0, 1, 0 ), new Vector3( 0, 1, 0 ), new Vector3( 0, 1, 0 ),
			new Vector3( 0, 1, 0 ), new Vector3( 0, 0, 1 ),	new Vector3( 0, 0, - 1 )
		];

	}

	updateMatrices( light, viewportIndex = 0 ) {

		const camera = this.camera;
		const shadowMatrix = this.matrix;

		const far = light.distance || camera.far;

		if ( far !== camera.far ) {

			camera.far = far;
			camera.updateProjectionMatrix();

		}

		_lightPositionWorld.setFromMatrixPosition( light.matrixWorld );
		camera.position.copy( _lightPositionWorld );

		_lookTarget.copy( camera.position );
		_lookTarget.add( this._cubeDirections[ viewportIndex ] );
		camera.up.copy( this._cubeUps[ viewportIndex ] );
		camera.lookAt( _lookTarget );
		camera.updateMatrixWorld();

		shadowMatrix.makeTranslation( - _lightPositionWorld.x, - _lightPositionWorld.y, - _lightPositionWorld.z );

		_projScreenMatrix$1.multiplyMatrices( camera.projectionMatrix, camera.matrixWorldInverse );
		this._frustum.setFromProjectionMatrix( _projScreenMatrix$1 );

	}

}

class PointLight extends Light {

	constructor( color, intensity, distance = 0, decay = 2 ) {

		super( color, intensity );

		this.isPointLight = true;

		this.type = 'PointLight';

		this.distance = distance;
		this.decay = decay;

		this.shadow = new PointLightShadow();

	}

	get power() {

		// compute the light's luminous power (in lumens) from its intensity (in candela)
		// for an isotropic light source, luminous power (lm) = 4 π luminous intensity (cd)
		return this.intensity * 4 * Math.PI;

	}

	set power( power ) {

		// set the light's intensity (in candela) from the desired luminous power (in lumens)
		this.intensity = power / ( 4 * Math.PI );

	}

	dispose() {

		this.shadow.dispose();

	}

	copy( source, recursive ) {

		super.copy( source, recursive );

		this.distance = source.distance;
		this.decay = source.decay;

		this.shadow = source.shadow.clone();

		return this;

	}

}

class OrthographicCamera extends Camera {

	constructor( left = - 1, right = 1, top = 1, bottom = - 1, near = 0.1, far = 2000 ) {

		super();

		this.isOrthographicCamera = true;

		this.type = 'OrthographicCamera';

		this.zoom = 1;
		this.view = null;

		this.left = left;
		this.right = right;
		this.top = top;
		this.bottom = bottom;

		this.near = near;
		this.far = far;

		this.updateProjectionMatrix();

	}

	copy( source, recursive ) {

		super.copy( source, recursive );

		this.left = source.left;
		this.right = source.right;
		this.top = source.top;
		this.bottom = source.bottom;
		this.near = source.near;
		this.far = source.far;

		this.zoom = source.zoom;
		this.view = source.view === null ? null : Object.assign( {}, source.view );

		return this;

	}

	setViewOffset( fullWidth, fullHeight, x, y, width, height ) {

		if ( this.view === null ) {

			this.view = {
				enabled: true,
				fullWidth: 1,
				fullHeight: 1,
				offsetX: 0,
				offsetY: 0,
				width: 1,
				height: 1
			};

		}

		this.view.enabled = true;
		this.view.fullWidth = fullWidth;
		this.view.fullHeight = fullHeight;
		this.view.offsetX = x;
		this.view.offsetY = y;
		this.view.width = width;
		this.view.height = height;

		this.updateProjectionMatrix();

	}

	clearViewOffset() {

		if ( this.view !== null ) {

			this.view.enabled = false;

		}

		this.updateProjectionMatrix();

	}

	updateProjectionMatrix() {

		const dx = ( this.right - this.left ) / ( 2 * this.zoom );
		const dy = ( this.top - this.bottom ) / ( 2 * this.zoom );
		const cx = ( this.right + this.left ) / 2;
		const cy = ( this.top + this.bottom ) / 2;

		let left = cx - dx;
		let right = cx + dx;
		let top = cy + dy;
		let bottom = cy - dy;

		if ( this.view !== null && this.view.enabled ) {

			const scaleW = ( this.right - this.left ) / this.view.fullWidth / this.zoom;
			const scaleH = ( this.top - this.bottom ) / this.view.fullHeight / this.zoom;

			left += scaleW * this.view.offsetX;
			right = left + scaleW * this.view.width;
			top -= scaleH * this.view.offsetY;
			bottom = top - scaleH * this.view.height;

		}

		this.projectionMatrix.makeOrthographic( left, right, top, bottom, this.near, this.far, this.coordinateSystem );

		this.projectionMatrixInverse.copy( this.projectionMatrix ).invert();

	}

	toJSON( meta ) {

		const data = super.toJSON( meta );

		data.object.zoom = this.zoom;
		data.object.left = this.left;
		data.object.right = this.right;
		data.object.top = this.top;
		data.object.bottom = this.bottom;
		data.object.near = this.near;
		data.object.far = this.far;

		if ( this.view !== null ) data.object.view = Object.assign( {}, this.view );

		return data;

	}

}

class DirectionalLightShadow extends LightShadow {

	constructor() {

		super( new OrthographicCamera( - 5, 5, 5, - 5, 0.5, 500 ) );

		this.isDirectionalLightShadow = true;

	}

}

class DirectionalLight extends Light {

	constructor( color, intensity ) {

		super( color, intensity );

		this.isDirectionalLight = true;

		this.type = 'DirectionalLight';

		this.position.copy( Object3D.DEFAULT_UP );
		this.updateMatrix();

		this.target = new Object3D();

		this.shadow = new DirectionalLightShadow();

	}

	dispose() {

		this.shadow.dispose();

	}

	copy( source ) {

		super.copy( source );

		this.target = source.target.clone();
		this.shadow = source.shadow.clone();

		return this;

	}

}

class AmbientLight extends Light {

	constructor( color, intensity ) {

		super( color, intensity );

		this.isAmbientLight = true;

		this.type = 'AmbientLight';

	}

}

class RectAreaLight extends Light {

	constructor( color, intensity, width = 10, height = 10 ) {

		super( color, intensity );

		this.isRectAreaLight = true;

		this.type = 'RectAreaLight';

		this.width = width;
		this.height = height;

	}

	get power() {

		// compute the light's luminous power (in lumens) from its intensity (in nits)
		return this.intensity * this.width * this.height * Math.PI;

	}

	set power( power ) {

		// set the light's intensity (in nits) from the desired luminous power (in lumens)
		this.intensity = power / ( this.width * this.height * Math.PI );

	}

	copy( source ) {

		super.copy( source );

		this.width = source.width;
		this.height = source.height;

		return this;

	}

	toJSON( meta ) {

		const data = super.toJSON( meta );

		data.object.width = this.width;
		data.object.height = this.height;

		return data;

	}

}

/**
 * Primary reference:
 *   https://graphics.stanford.edu/papers/envmap/envmap.pdf
 *
 * Secondary reference:
 *   https://www.ppsloan.org/publications/StupidSH36.pdf
 */

// 3-band SH defined by 9 coefficients

class SphericalHarmonics3 {

	constructor() {

		this.isSphericalHarmonics3 = true;

		this.coefficients = [];

		for ( let i = 0; i < 9; i ++ ) {

			this.coefficients.push( new Vector3() );

		}

	}

	set( coefficients ) {

		for ( let i = 0; i < 9; i ++ ) {

			this.coefficients[ i ].copy( coefficients[ i ] );

		}

		return this;

	}

	zero() {

		for ( let i = 0; i < 9; i ++ ) {

			this.coefficients[ i ].set( 0, 0, 0 );

		}

		return this;

	}

	// get the radiance in the direction of the normal
	// target is a Vector3
	getAt( normal, target ) {

		// normal is assumed to be unit length

		const x = normal.x, y = normal.y, z = normal.z;

		const coeff = this.coefficients;

		// band 0
		target.copy( coeff[ 0 ] ).multiplyScalar( 0.282095 );

		// band 1
		target.addScaledVector( coeff[ 1 ], 0.488603 * y );
		target.addScaledVector( coeff[ 2 ], 0.488603 * z );
		target.addScaledVector( coeff[ 3 ], 0.488603 * x );

		// band 2
		target.addScaledVector( coeff[ 4 ], 1.092548 * ( x * y ) );
		target.addScaledVector( coeff[ 5 ], 1.092548 * ( y * z ) );
		target.addScaledVector( coeff[ 6 ], 0.315392 * ( 3.0 * z * z - 1.0 ) );
		target.addScaledVector( coeff[ 7 ], 1.092548 * ( x * z ) );
		target.addScaledVector( coeff[ 8 ], 0.546274 * ( x * x - y * y ) );

		return target;

	}

	// get the irradiance (radiance convolved with cosine lobe) in the direction of the normal
	// target is a Vector3
	// https://graphics.stanford.edu/papers/envmap/envmap.pdf
	getIrradianceAt( normal, target ) {

		// normal is assumed to be unit length

		const x = normal.x, y = normal.y, z = normal.z;

		const coeff = this.coefficients;

		// band 0
		target.copy( coeff[ 0 ] ).multiplyScalar( 0.886227 ); // π * 0.282095

		// band 1
		target.addScaledVector( coeff[ 1 ], 2.0 * 0.511664 * y ); // ( 2 * π / 3 ) * 0.488603
		target.addScaledVector( coeff[ 2 ], 2.0 * 0.511664 * z );
		target.addScaledVector( coeff[ 3 ], 2.0 * 0.511664 * x );

		// band 2
		target.addScaledVector( coeff[ 4 ], 2.0 * 0.429043 * x * y ); // ( π / 4 ) * 1.092548
		target.addScaledVector( coeff[ 5 ], 2.0 * 0.429043 * y * z );
		target.addScaledVector( coeff[ 6 ], 0.743125 * z * z - 0.247708 ); // ( π / 4 ) * 0.315392 * 3
		target.addScaledVector( coeff[ 7 ], 2.0 * 0.429043 * x * z );
		target.addScaledVector( coeff[ 8 ], 0.429043 * ( x * x - y * y ) ); // ( π / 4 ) * 0.546274

		return target;

	}

	add( sh ) {

		for ( let i = 0; i < 9; i ++ ) {

			this.coefficients[ i ].add( sh.coefficients[ i ] );

		}

		return this;

	}

	addScaledSH( sh, s ) {

		for ( let i = 0; i < 9; i ++ ) {

			this.coefficients[ i ].addScaledVector( sh.coefficients[ i ], s );

		}

		return this;

	}

	scale( s ) {

		for ( let i = 0; i < 9; i ++ ) {

			this.coefficients[ i ].multiplyScalar( s );

		}

		return this;

	}

	lerp( sh, alpha ) {

		for ( let i = 0; i < 9; i ++ ) {

			this.coefficients[ i ].lerp( sh.coefficients[ i ], alpha );

		}

		return this;

	}

	equals( sh ) {

		for ( let i = 0; i < 9; i ++ ) {

			if ( ! this.coefficients[ i ].equals( sh.coefficients[ i ] ) ) {

				return false;

			}

		}

		return true;

	}

	copy( sh ) {

		return this.set( sh.coefficients );

	}

	clone() {

		return new this.constructor().copy( this );

	}

	fromArray( array, offset = 0 ) {

		const coefficients = this.coefficients;

		for ( let i = 0; i < 9; i ++ ) {

			coefficients[ i ].fromArray( array, offset + ( i * 3 ) );

		}

		return this;

	}

	toArray( array = [], offset = 0 ) {

		const coefficients = this.coefficients;

		for ( let i = 0; i < 9; i ++ ) {

			coefficients[ i ].toArray( array, offset + ( i * 3 ) );

		}

		return array;

	}

	// evaluate the basis functions
	// shBasis is an Array[ 9 ]
	static getBasisAt( normal, shBasis ) {

		// normal is assumed to be unit length

		const x = normal.x, y = normal.y, z = normal.z;

		// band 0
		shBasis[ 0 ] = 0.282095;

		// band 1
		shBasis[ 1 ] = 0.488603 * y;
		shBasis[ 2 ] = 0.488603 * z;
		shBasis[ 3 ] = 0.488603 * x;

		// band 2
		shBasis[ 4 ] = 1.092548 * x * y;
		shBasis[ 5 ] = 1.092548 * y * z;
		shBasis[ 6 ] = 0.315392 * ( 3 * z * z - 1 );
		shBasis[ 7 ] = 1.092548 * x * z;
		shBasis[ 8 ] = 0.546274 * ( x * x - y * y );

	}

}

class LightProbe extends Light {

	constructor( sh = new SphericalHarmonics3(), intensity = 1 ) {

		super( undefined, intensity );

		this.isLightProbe = true;

		this.sh = sh;

	}

	copy( source ) {

		super.copy( source );

		this.sh.copy( source.sh );

		return this;

	}

	fromJSON( json ) {

		this.intensity = json.intensity; // TODO: Move this bit to Light.fromJSON();
		this.sh.fromArray( json.sh );

		return this;

	}

	toJSON( meta ) {

		const data = super.toJSON( meta );

		data.object.sh = this.sh.toArray();

		return data;

	}

}

class MaterialLoader extends Loader {

	constructor( manager ) {

		super( manager );
		this.textures = {};

	}

	load( url, onLoad, onProgress, onError ) {

		const scope = this;

		const loader = new FileLoader( scope.manager );
		loader.setPath( scope.path );
		loader.setRequestHeader( scope.requestHeader );
		loader.setWithCredentials( scope.withCredentials );
		loader.load( url, function ( text ) {

			try {

				onLoad( scope.parse( JSON.parse( text ) ) );

			} catch ( e ) {

				if ( onError ) {

					onError( e );

				} else {

					console.error( e );

				}

				scope.manager.itemError( url );

			}

		}, onProgress, onError );

	}

	parse( json ) {

		const textures = this.textures;

		function getTexture( name ) {

			if ( textures[ name ] === undefined ) {

				console.warn( 'THREE.MaterialLoader: Undefined texture', name );

			}

			return textures[ name ];

		}

		const material = MaterialLoader.createMaterialFromType( json.type );

		if ( json.uuid !== undefined ) material.uuid = json.uuid;
		if ( json.name !== undefined ) material.name = json.name;
		if ( json.color !== undefined && material.color !== undefined ) material.color.setHex( json.color );
		if ( json.roughness !== undefined ) material.roughness = json.roughness;
		if ( json.metalness !== undefined ) material.metalness = json.metalness;
		if ( json.sheen !== undefined ) material.sheen = json.sheen;
		if ( json.sheenColor !== undefined ) material.sheenColor = new Color().setHex( json.sheenColor );
		if ( json.sheenRoughness !== undefined ) material.sheenRoughness = json.sheenRoughness;
		if ( json.emissive !== undefined && material.emissive !== undefined ) material.emissive.setHex( json.emissive );
		if ( json.specular !== undefined && material.specular !== undefined ) material.specular.setHex( json.specular );
		if ( json.specularIntensity !== undefined ) material.specularIntensity = json.specularIntensity;
		if ( json.specularColor !== undefined && material.specularColor !== undefined ) material.specularColor.setHex( json.specularColor );
		if ( json.shininess !== undefined ) material.shininess = json.shininess;
		if ( json.clearcoat !== undefined ) material.clearcoat = json.clearcoat;
		if ( json.clearcoatRoughness !== undefined ) material.clearcoatRoughness = json.clearcoatRoughness;
		if ( json.dispersion !== undefined ) material.dispersion = json.dispersion;
		if ( json.iridescence !== undefined ) material.iridescence = json.iridescence;
		if ( json.iridescenceIOR !== undefined ) material.iridescenceIOR = json.iridescenceIOR;
		if ( json.iridescenceThicknessRange !== undefined ) material.iridescenceThicknessRange = json.iridescenceThicknessRange;
		if ( json.transmission !== undefined ) material.transmission = json.transmission;
		if ( json.thickness !== undefined ) material.thickness = json.thickness;
		if ( json.attenuationDistance !== undefined ) material.attenuationDistance = json.attenuationDistance;
		if ( json.attenuationColor !== undefined && material.attenuationColor !== undefined ) material.attenuationColor.setHex( json.attenuationColor );
		if ( json.anisotropy !== undefined ) material.anisotropy = json.anisotropy;
		if ( json.anisotropyRotation !== undefined ) material.anisotropyRotation = json.anisotropyRotation;
		if ( json.fog !== undefined ) material.fog = json.fog;
		if ( json.flatShading !== undefined ) material.flatShading = json.flatShading;
		if ( json.blending !== undefined ) material.blending = json.blending;
		if ( json.combine !== undefined ) material.combine = json.combine;
		if ( json.side !== undefined ) material.side = json.side;
		if ( json.shadowSide !== undefined ) material.shadowSide = json.shadowSide;
		if ( json.opacity !== undefined ) material.opacity = json.opacity;
		if ( json.transparent !== undefined ) material.transparent = json.transparent;
		if ( json.alphaTest !== undefined ) material.alphaTest = json.alphaTest;
		if ( json.alphaHash !== undefined ) material.alphaHash = json.alphaHash;
		if ( json.depthFunc !== undefined ) material.depthFunc = json.depthFunc;
		if ( json.depthTest !== undefined ) material.depthTest = json.depthTest;
		if ( json.depthWrite !== undefined ) material.depthWrite = json.depthWrite;
		if ( json.colorWrite !== undefined ) material.colorWrite = json.colorWrite;
		if ( json.blendSrc !== undefined ) material.blendSrc = json.blendSrc;
		if ( json.blendDst !== undefined ) material.blendDst = json.blendDst;
		if ( json.blendEquation !== undefined ) material.blendEquation = json.blendEquation;
		if ( json.blendSrcAlpha !== undefined ) material.blendSrcAlpha = json.blendSrcAlpha;
		if ( json.blendDstAlpha !== undefined ) material.blendDstAlpha = json.blendDstAlpha;
		if ( json.blendEquationAlpha !== undefined ) material.blendEquationAlpha = json.blendEquationAlpha;
		if ( json.blendColor !== undefined && material.blendColor !== undefined ) material.blendColor.setHex( json.blendColor );
		if ( json.blendAlpha !== undefined ) material.blendAlpha = json.blendAlpha;
		if ( json.stencilWriteMask !== undefined ) material.stencilWriteMask = json.stencilWriteMask;
		if ( json.stencilFunc !== undefined ) material.stencilFunc = json.stencilFunc;
		if ( json.stencilRef !== undefined ) material.stencilRef = json.stencilRef;
		if ( json.stencilFuncMask !== undefined ) material.stencilFuncMask = json.stencilFuncMask;
		if ( json.stencilFail !== undefined ) material.stencilFail = json.stencilFail;
		if ( json.stencilZFail !== undefined ) material.stencilZFail = json.stencilZFail;
		if ( json.stencilZPass !== undefined ) material.stencilZPass = json.stencilZPass;
		if ( json.stencilWrite !== undefined ) material.stencilWrite = json.stencilWrite;

		if ( json.wireframe !== undefined ) material.wireframe = json.wireframe;
		if ( json.wireframeLinewidth !== undefined ) material.wireframeLinewidth = json.wireframeLinewidth;
		if ( json.wireframeLinecap !== undefined ) material.wireframeLinecap = json.wireframeLinecap;
		if ( json.wireframeLinejoin !== undefined ) material.wireframeLinejoin = json.wireframeLinejoin;

		if ( json.rotation !== undefined ) material.rotation = json.rotation;

		if ( json.linewidth !== undefined ) material.linewidth = json.linewidth;
		if ( json.dashSize !== undefined ) material.dashSize = json.dashSize;
		if ( json.gapSize !== undefined ) material.gapSize = json.gapSize;
		if ( json.scale !== undefined ) material.scale = json.scale;

		if ( json.polygonOffset !== undefined ) material.polygonOffset = json.polygonOffset;
		if ( json.polygonOffsetFactor !== undefined ) material.polygonOffsetFactor = json.polygonOffsetFactor;
		if ( json.polygonOffsetUnits !== undefined ) material.polygonOffsetUnits = json.polygonOffsetUnits;

		if ( json.dithering !== undefined ) material.dithering = json.dithering;

		if ( json.alphaToCoverage !== undefined ) material.alphaToCoverage = json.alphaToCoverage;
		if ( json.premultipliedAlpha !== undefined ) material.premultipliedAlpha = json.premultipliedAlpha;
		if ( json.forceSinglePass !== undefined ) material.forceSinglePass = json.forceSinglePass;

		if ( json.visible !== undefined ) material.visible = json.visible;

		if ( json.toneMapped !== undefined ) material.toneMapped = json.toneMapped;

		if ( json.userData !== undefined ) material.userData = json.userData;

		if ( json.vertexColors !== undefined ) {

			if ( typeof json.vertexColors === 'number' ) {

				material.vertexColors = ( json.vertexColors > 0 ) ? true : false;

			} else {

				material.vertexColors = json.vertexColors;

			}

		}

		// Shader Material

		if ( json.uniforms !== undefined ) {

			for ( const name in json.uniforms ) {

				const uniform = json.uniforms[ name ];

				material.uniforms[ name ] = {};

				switch ( uniform.type ) {

					case 't':
						material.uniforms[ name ].value = getTexture( uniform.value );
						break;

					case 'c':
						material.uniforms[ name ].value = new Color().setHex( uniform.value );
						break;

					case 'v2':
						material.uniforms[ name ].value = new Vector2().fromArray( uniform.value );
						break;

					case 'v3':
						material.uniforms[ name ].value = new Vector3().fromArray( uniform.value );
						break;

					case 'v4':
						material.uniforms[ name ].value = new Vector4().fromArray( uniform.value );
						break;

					case 'm3':
						material.uniforms[ name ].value = new Matrix3().fromArray( uniform.value );
						break;

					case 'm4':
						material.uniforms[ name ].value = new Matrix4().fromArray( uniform.value );
						break;

					default:
						material.uniforms[ name ].value = uniform.value;

				}

			}

		}

		if ( json.defines !== undefined ) material.defines = json.defines;
		if ( json.vertexShader !== undefined ) material.vertexShader = json.vertexShader;
		if ( json.fragmentShader !== undefined ) material.fragmentShader = json.fragmentShader;
		if ( json.glslVersion !== undefined ) material.glslVersion = json.glslVersion;

		if ( json.extensions !== undefined ) {

			for ( const key in json.extensions ) {

				material.extensions[ key ] = json.extensions[ key ];

			}

		}

		if ( json.lights !== undefined ) material.lights = json.lights;
		if ( json.clipping !== undefined ) material.clipping = json.clipping;

		// for PointsMaterial

		if ( json.size !== undefined ) material.size = json.size;
		if ( json.sizeAttenuation !== undefined ) material.sizeAttenuation = json.sizeAttenuation;

		// maps

		if ( json.map !== undefined ) material.map = getTexture( json.map );
		if ( json.matcap !== undefined ) material.matcap = getTexture( json.matcap );

		if ( json.alphaMap !== undefined ) material.alphaMap = getTexture( json.alphaMap );

		if ( json.bumpMap !== undefined ) material.bumpMap = getTexture( json.bumpMap );
		if ( json.bumpScale !== undefined ) material.bumpScale = json.bumpScale;

		if ( json.normalMap !== undefined ) material.normalMap = getTexture( json.normalMap );
		if ( json.normalMapType !== undefined ) material.normalMapType = json.normalMapType;
		if ( json.normalScale !== undefined ) {

			let normalScale = json.normalScale;

			if ( Array.isArray( normalScale ) === false ) {

				// Blender exporter used to export a scalar. See #7459

				normalScale = [ normalScale, normalScale ];

			}

			material.normalScale = new Vector2().fromArray( normalScale );

		}

		if ( json.displacementMap !== undefined ) material.displacementMap = getTexture( json.displacementMap );
		if ( json.displacementScale !== undefined ) material.displacementScale = json.displacementScale;
		if ( json.displacementBias !== undefined ) material.displacementBias = json.displacementBias;

		if ( json.roughnessMap !== undefined ) material.roughnessMap = getTexture( json.roughnessMap );
		if ( json.metalnessMap !== undefined ) material.metalnessMap = getTexture( json.metalnessMap );

		if ( json.emissiveMap !== undefined ) material.emissiveMap = getTexture( json.emissiveMap );
		if ( json.emissiveIntensity !== undefined ) material.emissiveIntensity = json.emissiveIntensity;

		if ( json.specularMap !== undefined ) material.specularMap = getTexture( json.specularMap );
		if ( json.specularIntensityMap !== undefined ) material.specularIntensityMap = getTexture( json.specularIntensityMap );
		if ( json.specularColorMap !== undefined ) material.specularColorMap = getTexture( json.specularColorMap );

		if ( json.envMap !== undefined ) material.envMap = getTexture( json.envMap );
		if ( json.envMapRotation !== undefined ) material.envMapRotation.fromArray( json.envMapRotation );
		if ( json.envMapIntensity !== undefined ) material.envMapIntensity = json.envMapIntensity;

		if ( json.reflectivity !== undefined ) material.reflectivity = json.reflectivity;
		if ( json.refractionRatio !== undefined ) material.refractionRatio = json.refractionRatio;

		if ( json.lightMap !== undefined ) material.lightMap = getTexture( json.lightMap );
		if ( json.lightMapIntensity !== undefined ) material.lightMapIntensity = json.lightMapIntensity;

		if ( json.aoMap !== undefined ) material.aoMap = getTexture( json.aoMap );
		if ( json.aoMapIntensity !== undefined ) material.aoMapIntensity = json.aoMapIntensity;

		if ( json.gradientMap !== undefined ) material.gradientMap = getTexture( json.gradientMap );

		if ( json.clearcoatMap !== undefined ) material.clearcoatMap = getTexture( json.clearcoatMap );
		if ( json.clearcoatRoughnessMap !== undefined ) material.clearcoatRoughnessMap = getTexture( json.clearcoatRoughnessMap );
		if ( json.clearcoatNormalMap !== undefined ) material.clearcoatNormalMap = getTexture( json.clearcoatNormalMap );
		if ( json.clearcoatNormalScale !== undefined ) material.clearcoatNormalScale = new Vector2().fromArray( json.clearcoatNormalScale );

		if ( json.iridescenceMap !== undefined ) material.iridescenceMap = getTexture( json.iridescenceMap );
		if ( json.iridescenceThicknessMap !== undefined ) material.iridescenceThicknessMap = getTexture( json.iridescenceThicknessMap );

		if ( json.transmissionMap !== undefined ) material.transmissionMap = getTexture( json.transmissionMap );
		if ( json.thicknessMap !== undefined ) material.thicknessMap = getTexture( json.thicknessMap );

		if ( json.anisotropyMap !== undefined ) material.anisotropyMap = getTexture( json.anisotropyMap );

		if ( json.sheenColorMap !== undefined ) material.sheenColorMap = getTexture( json.sheenColorMap );
		if ( json.sheenRoughnessMap !== undefined ) material.sheenRoughnessMap = getTexture( json.sheenRoughnessMap );

		return material;

	}

	setTextures( value ) {

		this.textures = value;
		return this;

	}

	static createMaterialFromType( type ) {

		const materialLib = {
			ShadowMaterial,
			SpriteMaterial,
			RawShaderMaterial,
			ShaderMaterial,
			PointsMaterial,
			MeshPhysicalMaterial,
			MeshStandardMaterial,
			MeshPhongMaterial,
			MeshToonMaterial,
			MeshNormalMaterial,
			MeshLambertMaterial,
			MeshDepthMaterial,
			MeshDistanceMaterial,
			MeshBasicMaterial,
			MeshMatcapMaterial,
			LineDashedMaterial,
			LineBasicMaterial,
			Material
		};

		return new materialLib[ type ]();

	}

}

class LoaderUtils {

	static decodeText( array ) { // @deprecated, r165

		console.warn( 'THREE.LoaderUtils: decodeText() has been deprecated with r165 and will be removed with r175. Use TextDecoder instead.' );

		if ( typeof TextDecoder !== 'undefined' ) {

			return new TextDecoder().decode( array );

		}

		// Avoid the String.fromCharCode.apply(null, array) shortcut, which
		// throws a "maximum call stack size exceeded" error for large arrays.

		let s = '';

		for ( let i = 0, il = array.length; i < il; i ++ ) {

			// Implicitly assumes little-endian.
			s += String.fromCharCode( array[ i ] );

		}

		try {

			// merges multi-byte utf-8 characters.

			return decodeURIComponent( escape( s ) );

		} catch ( e ) { // see #16358

			return s;

		}

	}

	static extractUrlBase( url ) {

		const index = url.lastIndexOf( '/' );

		if ( index === - 1 ) return './';

		return url.slice( 0, index + 1 );

	}

	static resolveURL( url, path ) {

		// Invalid URL
		if ( typeof url !== 'string' || url === '' ) return '';

		// Host Relative URL
		if ( /^https?:\/\//i.test( path ) && /^\//.test( url ) ) {

			path = path.replace( /(^https?:\/\/[^\/]+).*/i, '$1' );

		}

		// Absolute URL http://,https://,//
		if ( /^(https?:)?\/\//i.test( url ) ) return url;

		// Data URI
		if ( /^data:.*,.*$/i.test( url ) ) return url;

		// Blob URL
		if ( /^blob:.*$/i.test( url ) ) return url;

		// Relative URL
		return path + url;

	}

}

class InstancedBufferGeometry extends BufferGeometry {

	constructor() {

		super();

		this.isInstancedBufferGeometry = true;

		this.type = 'InstancedBufferGeometry';
		this.instanceCount = Infinity;

	}

	copy( source ) {

		super.copy( source );

		this.instanceCount = source.instanceCount;

		return this;

	}

	toJSON() {

		const data = super.toJSON();

		data.instanceCount = this.instanceCount;

		data.isInstancedBufferGeometry = true;

		return data;

	}

}

class BufferGeometryLoader extends Loader {

	constructor( manager ) {

		super( manager );

	}

	load( url, onLoad, onProgress, onError ) {

		const scope = this;

		const loader = new FileLoader( scope.manager );
		loader.setPath( scope.path );
		loader.setRequestHeader( scope.requestHeader );
		loader.setWithCredentials( scope.withCredentials );
		loader.load( url, function ( text ) {

			try {

				onLoad( scope.parse( JSON.parse( text ) ) );

			} catch ( e ) {

				if ( onError ) {

					onError( e );

				} else {

					console.error( e );

				}

				scope.manager.itemError( url );

			}

		}, onProgress, onError );

	}

	parse( json ) {

		const interleavedBufferMap = {};
		const arrayBufferMap = {};

		function getInterleavedBuffer( json, uuid ) {

			if ( interleavedBufferMap[ uuid ] !== undefined ) return interleavedBufferMap[ uuid ];

			const interleavedBuffers = json.interleavedBuffers;
			const interleavedBuffer = interleavedBuffers[ uuid ];

			const buffer = getArrayBuffer( json, interleavedBuffer.buffer );

			const array = getTypedArray( interleavedBuffer.type, buffer );
			const ib = new InterleavedBuffer( array, interleavedBuffer.stride );
			ib.uuid = interleavedBuffer.uuid;

			interleavedBufferMap[ uuid ] = ib;

			return ib;

		}

		function getArrayBuffer( json, uuid ) {

			if ( arrayBufferMap[ uuid ] !== undefined ) return arrayBufferMap[ uuid ];

			const arrayBuffers = json.arrayBuffers;
			const arrayBuffer = arrayBuffers[ uuid ];

			const ab = new Uint32Array( arrayBuffer ).buffer;

			arrayBufferMap[ uuid ] = ab;

			return ab;

		}

		const geometry = json.isInstancedBufferGeometry ? new InstancedBufferGeometry() : new BufferGeometry();

		const index = json.data.index;

		if ( index !== undefined ) {

			const typedArray = getTypedArray( index.type, index.array );
			geometry.setIndex( new BufferAttribute( typedArray, 1 ) );

		}

		const attributes = json.data.attributes;

		for ( const key in attributes ) {

			const attribute = attributes[ key ];
			let bufferAttribute;

			if ( attribute.isInterleavedBufferAttribute ) {

				const interleavedBuffer = getInterleavedBuffer( json.data, attribute.data );
				bufferAttribute = new InterleavedBufferAttribute( interleavedBuffer, attribute.itemSize, attribute.offset, attribute.normalized );

			} else {

				const typedArray = getTypedArray( attribute.type, attribute.array );
				const bufferAttributeConstr = attribute.isInstancedBufferAttribute ? InstancedBufferAttribute : BufferAttribute;
				bufferAttribute = new bufferAttributeConstr( typedArray, attribute.itemSize, attribute.normalized );

			}

			if ( attribute.name !== undefined ) bufferAttribute.name = attribute.name;
			if ( attribute.usage !== undefined ) bufferAttribute.setUsage( attribute.usage );

			geometry.setAttribute( key, bufferAttribute );

		}

		const morphAttributes = json.data.morphAttributes;

		if ( morphAttributes ) {

			for ( const key in morphAttributes ) {

				const attributeArray = morphAttributes[ key ];

				const array = [];

				for ( let i = 0, il = attributeArray.length; i < il; i ++ ) {

					const attribute = attributeArray[ i ];
					let bufferAttribute;

					if ( attribute.isInterleavedBufferAttribute ) {

						const interleavedBuffer = getInterleavedBuffer( json.data, attribute.data );
						bufferAttribute = new InterleavedBufferAttribute( interleavedBuffer, attribute.itemSize, attribute.offset, attribute.normalized );

					} else {

						const typedArray = getTypedArray( attribute.type, attribute.array );
						bufferAttribute = new BufferAttribute( typedArray, attribute.itemSize, attribute.normalized );

					}

					if ( attribute.name !== undefined ) bufferAttribute.name = attribute.name;
					array.push( bufferAttribute );

				}

				geometry.morphAttributes[ key ] = array;

			}

		}

		const morphTargetsRelative = json.data.morphTargetsRelative;

		if ( morphTargetsRelative ) {

			geometry.morphTargetsRelative = true;

		}

		const groups = json.data.groups || json.data.drawcalls || json.data.offsets;

		if ( groups !== undefined ) {

			for ( let i = 0, n = groups.length; i !== n; ++ i ) {

				const group = groups[ i ];

				geometry.addGroup( group.start, group.count, group.materialIndex );

			}

		}

		const boundingSphere = json.data.boundingSphere;

		if ( boundingSphere !== undefined ) {

			const center = new Vector3();

			if ( boundingSphere.center !== undefined ) {

				center.fromArray( boundingSphere.center );

			}

			geometry.boundingSphere = new Sphere( center, boundingSphere.radius );

		}

		if ( json.name ) geometry.name = json.name;
		if ( json.userData ) geometry.userData = json.userData;

		return geometry;

	}

}

class ObjectLoader extends Loader {

	constructor( manager ) {

		super( manager );

	}

	load( url, onLoad, onProgress, onError ) {

		const scope = this;

		const path = ( this.path === '' ) ? LoaderUtils.extractUrlBase( url ) : this.path;
		this.resourcePath = this.resourcePath || path;

		const loader = new FileLoader( this.manager );
		loader.setPath( this.path );
		loader.setRequestHeader( this.requestHeader );
		loader.setWithCredentials( this.withCredentials );
		loader.load( url, function ( text ) {

			let json = null;

			try {

				json = JSON.parse( text );

			} catch ( error ) {

				if ( onError !== undefined ) onError( error );

				console.error( 'THREE:ObjectLoader: Can\'t parse ' + url + '.', error.message );

				return;

			}

			const metadata = json.metadata;

			if ( metadata === undefined || metadata.type === undefined || metadata.type.toLowerCase() === 'geometry' ) {

				if ( onError !== undefined ) onError( new Error( 'THREE.ObjectLoader: Can\'t load ' + url ) );

				console.error( 'THREE.ObjectLoader: Can\'t load ' + url );
				return;

			}

			scope.parse( json, onLoad );

		}, onProgress, onError );

	}

	async loadAsync( url, onProgress ) {

		const scope = this;

		const path = ( this.path === '' ) ? LoaderUtils.extractUrlBase( url ) : this.path;
		this.resourcePath = this.resourcePath || path;

		const loader = new FileLoader( this.manager );
		loader.setPath( this.path );
		loader.setRequestHeader( this.requestHeader );
		loader.setWithCredentials( this.withCredentials );

		const text = await loader.loadAsync( url, onProgress );

		const json = JSON.parse( text );

		const metadata = json.metadata;

		if ( metadata === undefined || metadata.type === undefined || metadata.type.toLowerCase() === 'geometry' ) {

			throw new Error( 'THREE.ObjectLoader: Can\'t load ' + url );

		}

		return await scope.parseAsync( json );

	}

	parse( json, onLoad ) {

		const animations = this.parseAnimations( json.animations );
		const shapes = this.parseShapes( json.shapes );
		const geometries = this.parseGeometries( json.geometries, shapes );

		const images = this.parseImages( json.images, function () {

			if ( onLoad !== undefined ) onLoad( object );

		} );

		const textures = this.parseTextures( json.textures, images );
		const materials = this.parseMaterials( json.materials, textures );

		const object = this.parseObject( json.object, geometries, materials, textures, animations );
		const skeletons = this.parseSkeletons( json.skeletons, object );

		this.bindSkeletons( object, skeletons );
		this.bindLightTargets( object );

		//

		if ( onLoad !== undefined ) {

			let hasImages = false;

			for ( const uuid in images ) {

				if ( images[ uuid ].data instanceof HTMLImageElement ) {

					hasImages = true;
					break;

				}

			}

			if ( hasImages === false ) onLoad( object );

		}

		return object;

	}

	async parseAsync( json ) {

		const animations = this.parseAnimations( json.animations );
		const shapes = this.parseShapes( json.shapes );
		const geometries = this.parseGeometries( json.geometries, shapes );

		const images = await this.parseImagesAsync( json.images );

		const textures = this.parseTextures( json.textures, images );
		const materials = this.parseMaterials( json.materials, textures );

		const object = this.parseObject( json.object, geometries, materials, textures, animations );
		const skeletons = this.parseSkeletons( json.skeletons, object );

		this.bindSkeletons( object, skeletons );
		this.bindLightTargets( object );

		return object;

	}

	parseShapes( json ) {

		const shapes = {};

		if ( json !== undefined ) {

			for ( let i = 0, l = json.length; i < l; i ++ ) {

				const shape = new Shape().fromJSON( json[ i ] );

				shapes[ shape.uuid ] = shape;

			}

		}

		return shapes;

	}

	parseSkeletons( json, object ) {

		const skeletons = {};
		const bones = {};

		// generate bone lookup table

		object.traverse( function ( child ) {

			if ( child.isBone ) bones[ child.uuid ] = child;

		} );

		// create skeletons

		if ( json !== undefined ) {

			for ( let i = 0, l = json.length; i < l; i ++ ) {

				const skeleton = new Skeleton().fromJSON( json[ i ], bones );

				skeletons[ skeleton.uuid ] = skeleton;

			}

		}

		return skeletons;

	}

	parseGeometries( json, shapes ) {

		const geometries = {};

		if ( json !== undefined ) {

			const bufferGeometryLoader = new BufferGeometryLoader();

			for ( let i = 0, l = json.length; i < l; i ++ ) {

				let geometry;
				const data = json[ i ];

				switch ( data.type ) {

					case 'BufferGeometry':
					case 'InstancedBufferGeometry':

						geometry = bufferGeometryLoader.parse( data );
						break;

					default:

						if ( data.type in Geometries$1 ) {

							geometry = Geometries$1[ data.type ].fromJSON( data, shapes );

						} else {

							console.warn( `THREE.ObjectLoader: Unsupported geometry type "${ data.type }"` );

						}

				}

				geometry.uuid = data.uuid;

				if ( data.name !== undefined ) geometry.name = data.name;
				if ( data.userData !== undefined ) geometry.userData = data.userData;

				geometries[ data.uuid ] = geometry;

			}

		}

		return geometries;

	}

	parseMaterials( json, textures ) {

		const cache = {}; // MultiMaterial
		const materials = {};

		if ( json !== undefined ) {

			const loader = new MaterialLoader();
			loader.setTextures( textures );

			for ( let i = 0, l = json.length; i < l; i ++ ) {

				const data = json[ i ];

				if ( cache[ data.uuid ] === undefined ) {

					cache[ data.uuid ] = loader.parse( data );

				}

				materials[ data.uuid ] = cache[ data.uuid ];

			}

		}

		return materials;

	}

	parseAnimations( json ) {

		const animations = {};

		if ( json !== undefined ) {

			for ( let i = 0; i < json.length; i ++ ) {

				const data = json[ i ];

				const clip = AnimationClip.parse( data );

				animations[ clip.uuid ] = clip;

			}

		}

		return animations;

	}

	parseImages( json, onLoad ) {

		const scope = this;
		const images = {};

		let loader;

		function loadImage( url ) {

			scope.manager.itemStart( url );

			return loader.load( url, function () {

				scope.manager.itemEnd( url );

			}, undefined, function () {

				scope.manager.itemError( url );
				scope.manager.itemEnd( url );

			} );

		}

		function deserializeImage( image ) {

			if ( typeof image === 'string' ) {

				const url = image;

				const path = /^(\/\/)|([a-z]+:(\/\/)?)/i.test( url ) ? url : scope.resourcePath + url;

				return loadImage( path );

			} else {

				if ( image.data ) {

					return {
						data: getTypedArray( image.type, image.data ),
						width: image.width,
						height: image.height
					};

				} else {

					return null;

				}

			}

		}

		if ( json !== undefined && json.length > 0 ) {

			const manager = new LoadingManager( onLoad );

			loader = new ImageLoader( manager );
			loader.setCrossOrigin( this.crossOrigin );

			for ( let i = 0, il = json.length; i < il; i ++ ) {

				const image = json[ i ];
				const url = image.url;

				if ( Array.isArray( url ) ) {

					// load array of images e.g CubeTexture

					const imageArray = [];

					for ( let j = 0, jl = url.length; j < jl; j ++ ) {

						const currentUrl = url[ j ];

						const deserializedImage = deserializeImage( currentUrl );

						if ( deserializedImage !== null ) {

							if ( deserializedImage instanceof HTMLImageElement ) {

								imageArray.push( deserializedImage );

							} else {

								// special case: handle array of data textures for cube textures

								imageArray.push( new DataTexture( deserializedImage.data, deserializedImage.width, deserializedImage.height ) );

							}

						}

					}

					images[ image.uuid ] = new Source( imageArray );

				} else {

					// load single image

					const deserializedImage = deserializeImage( image.url );
					images[ image.uuid ] = new Source( deserializedImage );


				}

			}

		}

		return images;

	}

	async parseImagesAsync( json ) {

		const scope = this;
		const images = {};

		let loader;

		async function deserializeImage( image ) {

			if ( typeof image === 'string' ) {

				const url = image;

				const path = /^(\/\/)|([a-z]+:(\/\/)?)/i.test( url ) ? url : scope.resourcePath + url;

				return await loader.loadAsync( path );

			} else {

				if ( image.data ) {

					return {
						data: getTypedArray( image.type, image.data ),
						width: image.width,
						height: image.height
					};

				} else {

					return null;

				}

			}

		}

		if ( json !== undefined && json.length > 0 ) {

			loader = new ImageLoader( this.manager );
			loader.setCrossOrigin( this.crossOrigin );

			for ( let i = 0, il = json.length; i < il; i ++ ) {

				const image = json[ i ];
				const url = image.url;

				if ( Array.isArray( url ) ) {

					// load array of images e.g CubeTexture

					const imageArray = [];

					for ( let j = 0, jl = url.length; j < jl; j ++ ) {

						const currentUrl = url[ j ];

						const deserializedImage = await deserializeImage( currentUrl );

						if ( deserializedImage !== null ) {

							if ( deserializedImage instanceof HTMLImageElement ) {

								imageArray.push( deserializedImage );

							} else {

								// special case: handle array of data textures for cube textures

								imageArray.push( new DataTexture( deserializedImage.data, deserializedImage.width, deserializedImage.height ) );

							}

						}

					}

					images[ image.uuid ] = new Source( imageArray );

				} else {

					// load single image

					const deserializedImage = await deserializeImage( image.url );
					images[ image.uuid ] = new Source( deserializedImage );

				}

			}

		}

		return images;

	}

	parseTextures( json, images ) {

		function parseConstant( value, type ) {

			if ( typeof value === 'number' ) return value;

			console.warn( 'THREE.ObjectLoader.parseTexture: Constant should be in numeric form.', value );

			return type[ value ];

		}

		const textures = {};

		if ( json !== undefined ) {

			for ( let i = 0, l = json.length; i < l; i ++ ) {

				const data = json[ i ];

				if ( data.image === undefined ) {

					console.warn( 'THREE.ObjectLoader: No "image" specified for', data.uuid );

				}

				if ( images[ data.image ] === undefined ) {

					console.warn( 'THREE.ObjectLoader: Undefined image', data.image );

				}

				const source = images[ data.image ];
				const image = source.data;

				let texture;

				if ( Array.isArray( image ) ) {

					texture = new CubeTexture();

					if ( image.length === 6 ) texture.needsUpdate = true;

				} else {

					if ( image && image.data ) {

						texture = new DataTexture();

					} else {

						texture = new Texture();

					}

					if ( image ) texture.needsUpdate = true; // textures can have undefined image data

				}

				texture.source = source;

				texture.uuid = data.uuid;

				if ( data.name !== undefined ) texture.name = data.name;

				if ( data.mapping !== undefined ) texture.mapping = parseConstant( data.mapping, TEXTURE_MAPPING );
				if ( data.channel !== undefined ) texture.channel = data.channel;

				if ( data.offset !== undefined ) texture.offset.fromArray( data.offset );
				if ( data.repeat !== undefined ) texture.repeat.fromArray( data.repeat );
				if ( data.center !== undefined ) texture.center.fromArray( data.center );
				if ( data.rotation !== undefined ) texture.rotation = data.rotation;

				if ( data.wrap !== undefined ) {

					texture.wrapS = parseConstant( data.wrap[ 0 ], TEXTURE_WRAPPING );
					texture.wrapT = parseConstant( data.wrap[ 1 ], TEXTURE_WRAPPING );

				}

				if ( data.format !== undefined ) texture.format = data.format;
				if ( data.internalFormat !== undefined ) texture.internalFormat = data.internalFormat;
				if ( data.type !== undefined ) texture.type = data.type;
				if ( data.colorSpace !== undefined ) texture.colorSpace = data.colorSpace;

				if ( data.minFilter !== undefined ) texture.minFilter = parseConstant( data.minFilter, TEXTURE_FILTER );
				if ( data.magFilter !== undefined ) texture.magFilter = parseConstant( data.magFilter, TEXTURE_FILTER );
				if ( data.anisotropy !== undefined ) texture.anisotropy = data.anisotropy;

				if ( data.flipY !== undefined ) texture.flipY = data.flipY;

				if ( data.generateMipmaps !== undefined ) texture.generateMipmaps = data.generateMipmaps;
				if ( data.premultiplyAlpha !== undefined ) texture.premultiplyAlpha = data.premultiplyAlpha;
				if ( data.unpackAlignment !== undefined ) texture.unpackAlignment = data.unpackAlignment;
				if ( data.compareFunction !== undefined ) texture.compareFunction = data.compareFunction;

				if ( data.userData !== undefined ) texture.userData = data.userData;

				textures[ data.uuid ] = texture;

			}

		}

		return textures;

	}

	parseObject( data, geometries, materials, textures, animations ) {

		let object;

		function getGeometry( name ) {

			if ( geometries[ name ] === undefined ) {

				console.warn( 'THREE.ObjectLoader: Undefined geometry', name );

			}

			return geometries[ name ];

		}

		function getMaterial( name ) {

			if ( name === undefined ) return undefined;

			if ( Array.isArray( name ) ) {

				const array = [];

				for ( let i = 0, l = name.length; i < l; i ++ ) {

					const uuid = name[ i ];

					if ( materials[ uuid ] === undefined ) {

						console.warn( 'THREE.ObjectLoader: Undefined material', uuid );

					}

					array.push( materials[ uuid ] );

				}

				return array;

			}

			if ( materials[ name ] === undefined ) {

				console.warn( 'THREE.ObjectLoader: Undefined material', name );

			}

			return materials[ name ];

		}

		function getTexture( uuid ) {

			if ( textures[ uuid ] === undefined ) {

				console.warn( 'THREE.ObjectLoader: Undefined texture', uuid );

			}

			return textures[ uuid ];

		}

		let geometry, material;

		switch ( data.type ) {

			case 'Scene':

				object = new Scene();

				if ( data.background !== undefined ) {

					if ( Number.isInteger( data.background ) ) {

						object.background = new Color( data.background );

					} else {

						object.background = getTexture( data.background );

					}

				}

				if ( data.environment !== undefined ) {

					object.environment = getTexture( data.environment );

				}

				if ( data.fog !== undefined ) {

					if ( data.fog.type === 'Fog' ) {

						object.fog = new Fog( data.fog.color, data.fog.near, data.fog.far );

					} else if ( data.fog.type === 'FogExp2' ) {

						object.fog = new FogExp2( data.fog.color, data.fog.density );

					}

					if ( data.fog.name !== '' ) {

						object.fog.name = data.fog.name;

					}

				}

				if ( data.backgroundBlurriness !== undefined ) object.backgroundBlurriness = data.backgroundBlurriness;
				if ( data.backgroundIntensity !== undefined ) object.backgroundIntensity = data.backgroundIntensity;
				if ( data.backgroundRotation !== undefined ) object.backgroundRotation.fromArray( data.backgroundRotation );

				if ( data.environmentIntensity !== undefined ) object.environmentIntensity = data.environmentIntensity;
				if ( data.environmentRotation !== undefined ) object.environmentRotation.fromArray( data.environmentRotation );

				break;

			case 'PerspectiveCamera':

				object = new PerspectiveCamera( data.fov, data.aspect, data.near, data.far );

				if ( data.focus !== undefined ) object.focus = data.focus;
				if ( data.zoom !== undefined ) object.zoom = data.zoom;
				if ( data.filmGauge !== undefined ) object.filmGauge = data.filmGauge;
				if ( data.filmOffset !== undefined ) object.filmOffset = data.filmOffset;
				if ( data.view !== undefined ) object.view = Object.assign( {}, data.view );

				break;

			case 'OrthographicCamera':

				object = new OrthographicCamera( data.left, data.right, data.top, data.bottom, data.near, data.far );

				if ( data.zoom !== undefined ) object.zoom = data.zoom;
				if ( data.view !== undefined ) object.view = Object.assign( {}, data.view );

				break;

			case 'AmbientLight':

				object = new AmbientLight( data.color, data.intensity );

				break;

			case 'DirectionalLight':

				object = new DirectionalLight( data.color, data.intensity );
				object.target = data.target || '';

				break;

			case 'PointLight':

				object = new PointLight( data.color, data.intensity, data.distance, data.decay );

				break;

			case 'RectAreaLight':

				object = new RectAreaLight( data.color, data.intensity, data.width, data.height );

				break;

			case 'SpotLight':

				object = new SpotLight( data.color, data.intensity, data.distance, data.angle, data.penumbra, data.decay );
				object.target = data.target || '';

				break;

			case 'HemisphereLight':

				object = new HemisphereLight( data.color, data.groundColor, data.intensity );

				break;

			case 'LightProbe':

				object = new LightProbe().fromJSON( data );

				break;

			case 'SkinnedMesh':

				geometry = getGeometry( data.geometry );
			 	material = getMaterial( data.material );

				object = new SkinnedMesh( geometry, material );

				if ( data.bindMode !== undefined ) object.bindMode = data.bindMode;
				if ( data.bindMatrix !== undefined ) object.bindMatrix.fromArray( data.bindMatrix );
				if ( data.skeleton !== undefined ) object.skeleton = data.skeleton;

				break;

			case 'Mesh':

				geometry = getGeometry( data.geometry );
				material = getMaterial( data.material );

				object = new Mesh( geometry, material );

				break;

			case 'InstancedMesh':

				geometry = getGeometry( data.geometry );
				material = getMaterial( data.material );
				const count = data.count;
				const instanceMatrix = data.instanceMatrix;
				const instanceColor = data.instanceColor;

				object = new InstancedMesh( geometry, material, count );
				object.instanceMatrix = new InstancedBufferAttribute( new Float32Array( instanceMatrix.array ), 16 );
				if ( instanceColor !== undefined ) object.instanceColor = new InstancedBufferAttribute( new Float32Array( instanceColor.array ), instanceColor.itemSize );

				break;

			case 'BatchedMesh':

				geometry = getGeometry( data.geometry );
				material = getMaterial( data.material );

				object = new BatchedMesh( data.maxInstanceCount, data.maxVertexCount, data.maxIndexCount, material );
				object.geometry = geometry;
				object.perObjectFrustumCulled = data.perObjectFrustumCulled;
				object.sortObjects = data.sortObjects;

				object._drawRanges = data.drawRanges;
				object._reservedRanges = data.reservedRanges;

				object._visibility = data.visibility;
				object._active = data.active;
				object._bounds = data.bounds.map( bound => {

					const box = new Box3();
					box.min.fromArray( bound.boxMin );
					box.max.fromArray( bound.boxMax );

					const sphere = new Sphere();
					sphere.radius = bound.sphereRadius;
					sphere.center.fromArray( bound.sphereCenter );

					return {
						boxInitialized: bound.boxInitialized,
						box: box,

						sphereInitialized: bound.sphereInitialized,
						sphere: sphere
					};

				} );

				object._maxInstanceCount = data.maxInstanceCount;
				object._maxVertexCount = data.maxVertexCount;
				object._maxIndexCount = data.maxIndexCount;

				object._geometryInitialized = data.geometryInitialized;
				object._geometryCount = data.geometryCount;

				object._matricesTexture = getTexture( data.matricesTexture.uuid );
				if ( data.colorsTexture !== undefined ) object._colorsTexture = getTexture( data.colorsTexture.uuid );

				break;

			case 'LOD':

				object = new LOD();

				break;

			case 'Line':

				object = new Line( getGeometry( data.geometry ), getMaterial( data.material ) );

				break;

			case 'LineLoop':

				object = new LineLoop( getGeometry( data.geometry ), getMaterial( data.material ) );

				break;

			case 'LineSegments':

				object = new LineSegments( getGeometry( data.geometry ), getMaterial( data.material ) );

				break;

			case 'PointCloud':
			case 'Points':

				object = new Points( getGeometry( data.geometry ), getMaterial( data.material ) );

				break;

			case 'Sprite':

				object = new Sprite( getMaterial( data.material ) );

				break;

			case 'Group':

				object = new Group();

				break;

			case 'Bone':

				object = new Bone();

				break;

			default:

				object = new Object3D();

		}

		object.uuid = data.uuid;

		if ( data.name !== undefined ) object.name = data.name;

		if ( data.matrix !== undefined ) {

			object.matrix.fromArray( data.matrix );

			if ( data.matrixAutoUpdate !== undefined ) object.matrixAutoUpdate = data.matrixAutoUpdate;
			if ( object.matrixAutoUpdate ) object.matrix.decompose( object.position, object.quaternion, object.scale );

		} else {

			if ( data.position !== undefined ) object.position.fromArray( data.position );
			if ( data.rotation !== undefined ) object.rotation.fromArray( data.rotation );
			if ( data.quaternion !== undefined ) object.quaternion.fromArray( data.quaternion );
			if ( data.scale !== undefined ) object.scale.fromArray( data.scale );

		}

		if ( data.up !== undefined ) object.up.fromArray( data.up );

		if ( data.castShadow !== undefined ) object.castShadow = data.castShadow;
		if ( data.receiveShadow !== undefined ) object.receiveShadow = data.receiveShadow;

		if ( data.shadow ) {

			if ( data.shadow.intensity !== undefined ) object.shadow.intensity = data.shadow.intensity;
			if ( data.shadow.bias !== undefined ) object.shadow.bias = data.shadow.bias;
			if ( data.shadow.normalBias !== undefined ) object.shadow.normalBias = data.shadow.normalBias;
			if ( data.shadow.radius !== undefined ) object.shadow.radius = data.shadow.radius;
			if ( data.shadow.mapSize !== undefined ) object.shadow.mapSize.fromArray( data.shadow.mapSize );
			if ( data.shadow.camera !== undefined ) object.shadow.camera = this.parseObject( data.shadow.camera );

		}

		if ( data.visible !== undefined ) object.visible = data.visible;
		if ( data.frustumCulled !== undefined ) object.frustumCulled = data.frustumCulled;
		if ( data.renderOrder !== undefined ) object.renderOrder = data.renderOrder;
		if ( data.userData !== undefined ) object.userData = data.userData;
		if ( data.layers !== undefined ) object.layers.mask = data.layers;

		if ( data.children !== undefined ) {

			const children = data.children;

			for ( let i = 0; i < children.length; i ++ ) {

				object.add( this.parseObject( children[ i ], geometries, materials, textures, animations ) );

			}

		}

		if ( data.animations !== undefined ) {

			const objectAnimations = data.animations;

			for ( let i = 0; i < objectAnimations.length; i ++ ) {

				const uuid = objectAnimations[ i ];

				object.animations.push( animations[ uuid ] );

			}

		}

		if ( data.type === 'LOD' ) {

			if ( data.autoUpdate !== undefined ) object.autoUpdate = data.autoUpdate;

			const levels = data.levels;

			for ( let l = 0; l < levels.length; l ++ ) {

				const level = levels[ l ];
				const child = object.getObjectByProperty( 'uuid', level.object );

				if ( child !== undefined ) {

					object.addLevel( child, level.distance, level.hysteresis );

				}

			}

		}

		return object;

	}

	bindSkeletons( object, skeletons ) {

		if ( Object.keys( skeletons ).length === 0 ) return;

		object.traverse( function ( child ) {

			if ( child.isSkinnedMesh === true && child.skeleton !== undefined ) {

				const skeleton = skeletons[ child.skeleton ];

				if ( skeleton === undefined ) {

					console.warn( 'THREE.ObjectLoader: No skeleton found with UUID:', child.skeleton );

				} else {

					child.bind( skeleton, child.bindMatrix );

				}

			}

		} );

	}

	bindLightTargets( object ) {

		object.traverse( function ( child ) {

			if ( child.isDirectionalLight || child.isSpotLight ) {

				const uuid = child.target;

				const target = object.getObjectByProperty( 'uuid', uuid );

				if ( target !== undefined ) {

					child.target = target;

				} else {

					child.target = new Object3D();

				}

			}

		} );

	}

}

const TEXTURE_MAPPING = {
	UVMapping: UVMapping,
	CubeReflectionMapping: CubeReflectionMapping,
	CubeRefractionMapping: CubeRefractionMapping,
	EquirectangularReflectionMapping: EquirectangularReflectionMapping,
	EquirectangularRefractionMapping: EquirectangularRefractionMapping,
	CubeUVReflectionMapping: CubeUVReflectionMapping
};

const TEXTURE_WRAPPING = {
	RepeatWrapping: RepeatWrapping,
	ClampToEdgeWrapping: ClampToEdgeWrapping,
	MirroredRepeatWrapping: MirroredRepeatWrapping
};

const TEXTURE_FILTER = {
	NearestFilter: NearestFilter,
	NearestMipmapNearestFilter: NearestMipmapNearestFilter,
	NearestMipmapLinearFilter: NearestMipmapLinearFilter,
	LinearFilter: LinearFilter,
	LinearMipmapNearestFilter: LinearMipmapNearestFilter,
	LinearMipmapLinearFilter: LinearMipmapLinearFilter
};

class ImageBitmapLoader extends Loader {

	constructor( manager ) {

		super( manager );

		this.isImageBitmapLoader = true;

		if ( typeof createImageBitmap === 'undefined' ) {

			console.warn( 'THREE.ImageBitmapLoader: createImageBitmap() not supported.' );

		}

		if ( typeof fetch === 'undefined' ) {

			console.warn( 'THREE.ImageBitmapLoader: fetch() not supported.' );

		}

		this.options = { premultiplyAlpha: 'none' };

	}

	setOptions( options ) {

		this.options = options;

		return this;

	}

	load( url, onLoad, onProgress, onError ) {

		if ( url === undefined ) url = '';

		if ( this.path !== undefined ) url = this.path + url;

		url = this.manager.resolveURL( url );

		const scope = this;

		const cached = Cache.get( url );

		if ( cached !== undefined ) {

			scope.manager.itemStart( url );

			// If cached is a promise, wait for it to resolve
			if ( cached.then ) {

				cached.then( imageBitmap => {

					if ( onLoad ) onLoad( imageBitmap );

					scope.manager.itemEnd( url );

				} ).catch( e => {

					if ( onError ) onError( e );

				} );
				return;

			}

			// If cached is not a promise (i.e., it's already an imageBitmap)
			setTimeout( function () {

				if ( onLoad ) onLoad( cached );

				scope.manager.itemEnd( url );

			}, 0 );

			return cached;

		}

		const fetchOptions = {};
		fetchOptions.credentials = ( this.crossOrigin === 'anonymous' ) ? 'same-origin' : 'include';
		fetchOptions.headers = this.requestHeader;

		const promise = fetch( url, fetchOptions ).then( function ( res ) {

			return res.blob();

		} ).then( function ( blob ) {

			return createImageBitmap( blob, Object.assign( scope.options, { colorSpaceConversion: 'none' } ) );

		} ).then( function ( imageBitmap ) {

			Cache.add( url, imageBitmap );

			if ( onLoad ) onLoad( imageBitmap );

			scope.manager.itemEnd( url );

			return imageBitmap;

		} ).catch( function ( e ) {

			if ( onError ) onError( e );

			Cache.remove( url );

			scope.manager.itemError( url );
			scope.manager.itemEnd( url );

		} );

		Cache.add( url, promise );
		scope.manager.itemStart( url );

	}

}

let _context;

class AudioContext {

	static getContext() {

		if ( _context === undefined ) {

			_context = new ( window.AudioContext || window.webkitAudioContext )();

		}

		return _context;

	}

	static setContext( value ) {

		_context = value;

	}

}

class AudioLoader extends Loader {

	constructor( manager ) {

		super( manager );

	}

	load( url, onLoad, onProgress, onError ) {

		const scope = this;

		const loader = new FileLoader( this.manager );
		loader.setResponseType( 'arraybuffer' );
		loader.setPath( this.path );
		loader.setRequestHeader( this.requestHeader );
		loader.setWithCredentials( this.withCredentials );
		loader.load( url, function ( buffer ) {

			try {

				// Create a copy of the buffer. The `decodeAudioData` method
				// detaches the buffer when complete, preventing reuse.
				const bufferCopy = buffer.slice( 0 );

				const context = AudioContext.getContext();
				context.decodeAudioData( bufferCopy, function ( audioBuffer ) {

					onLoad( audioBuffer );

				} ).catch( handleError );

			} catch ( e ) {

				handleError( e );

			}

		}, onProgress, onError );

		function handleError( e ) {

			if ( onError ) {

				onError( e );

			} else {

				console.error( e );

			}

			scope.manager.itemError( url );

		}

	}

}

const _eyeRight = /*@__PURE__*/ new Matrix4();
const _eyeLeft = /*@__PURE__*/ new Matrix4();
const _projectionMatrix = /*@__PURE__*/ new Matrix4();

class StereoCamera {

	constructor() {

		this.type = 'StereoCamera';

		this.aspect = 1;

		this.eyeSep = 0.064;

		this.cameraL = new PerspectiveCamera();
		this.cameraL.layers.enable( 1 );
		this.cameraL.matrixAutoUpdate = false;

		this.cameraR = new PerspectiveCamera();
		this.cameraR.layers.enable( 2 );
		this.cameraR.matrixAutoUpdate = false;

		this._cache = {
			focus: null,
			fov: null,
			aspect: null,
			near: null,
			far: null,
			zoom: null,
			eyeSep: null
		};

	}

	update( camera ) {

		const cache = this._cache;

		const needsUpdate = cache.focus !== camera.focus || cache.fov !== camera.fov ||
			cache.aspect !== camera.aspect * this.aspect || cache.near !== camera.near ||
			cache.far !== camera.far || cache.zoom !== camera.zoom || cache.eyeSep !== this.eyeSep;

		if ( needsUpdate ) {

			cache.focus = camera.focus;
			cache.fov = camera.fov;
			cache.aspect = camera.aspect * this.aspect;
			cache.near = camera.near;
			cache.far = camera.far;
			cache.zoom = camera.zoom;
			cache.eyeSep = this.eyeSep;

			// Off-axis stereoscopic effect based on
			// http://paulbourke.net/stereographics/stereorender/

			_projectionMatrix.copy( camera.projectionMatrix );
			const eyeSepHalf = cache.eyeSep / 2;
			const eyeSepOnProjection = eyeSepHalf * cache.near / cache.focus;
			const ymax = ( cache.near * Math.tan( DEG2RAD * cache.fov * 0.5 ) ) / cache.zoom;
			let xmin, xmax;

			// translate xOffset

			_eyeLeft.elements[ 12 ] = - eyeSepHalf;
			_eyeRight.elements[ 12 ] = eyeSepHalf;

			// for left eye

			xmin = - ymax * cache.aspect + eyeSepOnProjection;
			xmax = ymax * cache.aspect + eyeSepOnProjection;

			_projectionMatrix.elements[ 0 ] = 2 * cache.near / ( xmax - xmin );
			_projectionMatrix.elements[ 8 ] = ( xmax + xmin ) / ( xmax - xmin );

			this.cameraL.projectionMatrix.copy( _projectionMatrix );

			// for right eye

			xmin = - ymax * cache.aspect - eyeSepOnProjection;
			xmax = ymax * cache.aspect - eyeSepOnProjection;

			_projectionMatrix.elements[ 0 ] = 2 * cache.near / ( xmax - xmin );
			_projectionMatrix.elements[ 8 ] = ( xmax + xmin ) / ( xmax - xmin );

			this.cameraR.projectionMatrix.copy( _projectionMatrix );

		}

		this.cameraL.matrixWorld.copy( camera.matrixWorld ).multiply( _eyeLeft );
		this.cameraR.matrixWorld.copy( camera.matrixWorld ).multiply( _eyeRight );

	}

}

class ArrayCamera extends PerspectiveCamera {

	constructor( array = [] ) {

		super();

		this.isArrayCamera = true;

		this.cameras = array;

	}

}

class Clock {

	constructor( autoStart = true ) {

		this.autoStart = autoStart;

		this.startTime = 0;
		this.oldTime = 0;
		this.elapsedTime = 0;

		this.running = false;

	}

	start() {

		this.startTime = now();

		this.oldTime = this.startTime;
		this.elapsedTime = 0;
		this.running = true;

	}

	stop() {

		this.getElapsedTime();
		this.running = false;
		this.autoStart = false;

	}

	getElapsedTime() {

		this.getDelta();
		return this.elapsedTime;

	}

	getDelta() {

		let diff = 0;

		if ( this.autoStart && ! this.running ) {

			this.start();
			return 0;

		}

		if ( this.running ) {

			const newTime = now();

			diff = ( newTime - this.oldTime ) / 1000;
			this.oldTime = newTime;

			this.elapsedTime += diff;

		}

		return diff;

	}

}

function now() {

	return ( typeof performance === 'undefined' ? Date : performance ).now(); // see #10732

}

const _position$1 = /*@__PURE__*/ new Vector3();
const _quaternion$1 = /*@__PURE__*/ new Quaternion();
const _scale$1 = /*@__PURE__*/ new Vector3();
const _orientation$1 = /*@__PURE__*/ new Vector3();

class AudioListener extends Object3D {

	constructor() {

		super();

		this.type = 'AudioListener';

		this.context = AudioContext.getContext();

		this.gain = this.context.createGain();
		this.gain.connect( this.context.destination );

		this.filter = null;

		this.timeDelta = 0;

		// private

		this._clock = new Clock();

	}

	getInput() {

		return this.gain;

	}

	removeFilter() {

		if ( this.filter !== null ) {

			this.gain.disconnect( this.filter );
			this.filter.disconnect( this.context.destination );
			this.gain.connect( this.context.destination );
			this.filter = null;

		}

		return this;

	}

	getFilter() {

		return this.filter;

	}

	setFilter( value ) {

		if ( this.filter !== null ) {

			this.gain.disconnect( this.filter );
			this.filter.disconnect( this.context.destination );

		} else {

			this.gain.disconnect( this.context.destination );

		}

		this.filter = value;
		this.gain.connect( this.filter );
		this.filter.connect( this.context.destination );

		return this;

	}

	getMasterVolume() {

		return this.gain.gain.value;

	}

	setMasterVolume( value ) {

		this.gain.gain.setTargetAtTime( value, this.context.currentTime, 0.01 );

		return this;

	}

	updateMatrixWorld( force ) {

		super.updateMatrixWorld( force );

		const listener = this.context.listener;
		const up = this.up;

		this.timeDelta = this._clock.getDelta();

		this.matrixWorld.decompose( _position$1, _quaternion$1, _scale$1 );

		_orientation$1.set( 0, 0, - 1 ).applyQuaternion( _quaternion$1 );

		if ( listener.positionX ) {

			// code path for Chrome (see #14393)

			const endTime = this.context.currentTime + this.timeDelta;

			listener.positionX.linearRampToValueAtTime( _position$1.x, endTime );
			listener.positionY.linearRampToValueAtTime( _position$1.y, endTime );
			listener.positionZ.linearRampToValueAtTime( _position$1.z, endTime );
			listener.forwardX.linearRampToValueAtTime( _orientation$1.x, endTime );
			listener.forwardY.linearRampToValueAtTime( _orientation$1.y, endTime );
			listener.forwardZ.linearRampToValueAtTime( _orientation$1.z, endTime );
			listener.upX.linearRampToValueAtTime( up.x, endTime );
			listener.upY.linearRampToValueAtTime( up.y, endTime );
			listener.upZ.linearRampToValueAtTime( up.z, endTime );

		} else {

			listener.setPosition( _position$1.x, _position$1.y, _position$1.z );
			listener.setOrientation( _orientation$1.x, _orientation$1.y, _orientation$1.z, up.x, up.y, up.z );

		}

	}

}

class Audio extends Object3D {

	constructor( listener ) {

		super();

		this.type = 'Audio';

		this.listener = listener;
		this.context = listener.context;

		this.gain = this.context.createGain();
		this.gain.connect( listener.getInput() );

		this.autoplay = false;

		this.buffer = null;
		this.detune = 0;
		this.loop = false;
		this.loopStart = 0;
		this.loopEnd = 0;
		this.offset = 0;
		this.duration = undefined;
		this.playbackRate = 1;
		this.isPlaying = false;
		this.hasPlaybackControl = true;
		this.source = null;
		this.sourceType = 'empty';

		this._startedAt = 0;
		this._progress = 0;
		this._connected = false;

		this.filters = [];

	}

	getOutput() {

		return this.gain;

	}

	setNodeSource( audioNode ) {

		this.hasPlaybackControl = false;
		this.sourceType = 'audioNode';
		this.source = audioNode;
		this.connect();

		return this;

	}

	setMediaElementSource( mediaElement ) {

		this.hasPlaybackControl = false;
		this.sourceType = 'mediaNode';
		this.source = this.context.createMediaElementSource( mediaElement );
		this.connect();

		return this;

	}

	setMediaStreamSource( mediaStream ) {

		this.hasPlaybackControl = false;
		this.sourceType = 'mediaStreamNode';
		this.source = this.context.createMediaStreamSource( mediaStream );
		this.connect();

		return this;

	}

	setBuffer( audioBuffer ) {

		this.buffer = audioBuffer;
		this.sourceType = 'buffer';

		if ( this.autoplay ) this.play();

		return this;

	}

	play( delay = 0 ) {

		if ( this.isPlaying === true ) {

			console.warn( 'THREE.Audio: Audio is already playing.' );
			return;

		}

		if ( this.hasPlaybackControl === false ) {

			console.warn( 'THREE.Audio: this Audio has no playback control.' );
			return;

		}

		this._startedAt = this.context.currentTime + delay;

		const source = this.context.createBufferSource();
		source.buffer = this.buffer;
		source.loop = this.loop;
		source.loopStart = this.loopStart;
		source.loopEnd = this.loopEnd;
		source.onended = this.onEnded.bind( this );
		source.start( this._startedAt, this._progress + this.offset, this.duration );

		this.isPlaying = true;

		this.source = source;

		this.setDetune( this.detune );
		this.setPlaybackRate( this.playbackRate );

		return this.connect();

	}

	pause() {

		if ( this.hasPlaybackControl === false ) {

			console.warn( 'THREE.Audio: this Audio has no playback control.' );
			return;

		}

		if ( this.isPlaying === true ) {

			// update current progress

			this._progress += Math.max( this.context.currentTime - this._startedAt, 0 ) * this.playbackRate;

			if ( this.loop === true ) {

				// ensure _progress does not exceed duration with looped audios

				this._progress = this._progress % ( this.duration || this.buffer.duration );

			}

			this.source.stop();
			this.source.onended = null;

			this.isPlaying = false;

		}

		return this;

	}

	stop() {

		if ( this.hasPlaybackControl === false ) {

			console.warn( 'THREE.Audio: this Audio has no playback control.' );
			return;

		}

		this._progress = 0;

		if ( this.source !== null ) {

			this.source.stop();
			this.source.onended = null;

		}

		this.isPlaying = false;

		return this;

	}

	connect() {

		if ( this.filters.length > 0 ) {

			this.source.connect( this.filters[ 0 ] );

			for ( let i = 1, l = this.filters.length; i < l; i ++ ) {

				this.filters[ i - 1 ].connect( this.filters[ i ] );

			}

			this.filters[ this.filters.length - 1 ].connect( this.getOutput() );

		} else {

			this.source.connect( this.getOutput() );

		}

		this._connected = true;

		return this;

	}

	disconnect() {

		if ( this._connected === false ) {

			return;

		}

		if ( this.filters.length > 0 ) {

			this.source.disconnect( this.filters[ 0 ] );

			for ( let i = 1, l = this.filters.length; i < l; i ++ ) {

				this.filters[ i - 1 ].disconnect( this.filters[ i ] );

			}

			this.filters[ this.filters.length - 1 ].disconnect( this.getOutput() );

		} else {

			this.source.disconnect( this.getOutput() );

		}

		this._connected = false;

		return this;

	}

	getFilters() {

		return this.filters;

	}

	setFilters( value ) {

		if ( ! value ) value = [];

		if ( this._connected === true ) {

			this.disconnect();
			this.filters = value.slice();
			this.connect();

		} else {

			this.filters = value.slice();

		}

		return this;

	}

	setDetune( value ) {

		this.detune = value;

		if ( this.isPlaying === true && this.source.detune !== undefined ) {

			this.source.detune.setTargetAtTime( this.detune, this.context.currentTime, 0.01 );

		}

		return this;

	}

	getDetune() {

		return this.detune;

	}

	getFilter() {

		return this.getFilters()[ 0 ];

	}

	setFilter( filter ) {

		return this.setFilters( filter ? [ filter ] : [] );

	}

	setPlaybackRate( value ) {

		if ( this.hasPlaybackControl === false ) {

			console.warn( 'THREE.Audio: this Audio has no playback control.' );
			return;

		}

		this.playbackRate = value;

		if ( this.isPlaying === true ) {

			this.source.playbackRate.setTargetAtTime( this.playbackRate, this.context.currentTime, 0.01 );

		}

		return this;

	}

	getPlaybackRate() {

		return this.playbackRate;

	}

	onEnded() {

		this.isPlaying = false;

	}

	getLoop() {

		if ( this.hasPlaybackControl === false ) {

			console.warn( 'THREE.Audio: this Audio has no playback control.' );
			return false;

		}

		return this.loop;

	}

	setLoop( value ) {

		if ( this.hasPlaybackControl === false ) {

			console.warn( 'THREE.Audio: this Audio has no playback control.' );
			return;

		}

		this.loop = value;

		if ( this.isPlaying === true ) {

			this.source.loop = this.loop;

		}

		return this;

	}

	setLoopStart( value ) {

		this.loopStart = value;

		return this;

	}

	setLoopEnd( value ) {

		this.loopEnd = value;

		return this;

	}

	getVolume() {

		return this.gain.gain.value;

	}

	setVolume( value ) {

		this.gain.gain.setTargetAtTime( value, this.context.currentTime, 0.01 );

		return this;

	}

}

const _position = /*@__PURE__*/ new Vector3();
const _quaternion = /*@__PURE__*/ new Quaternion();
const _scale = /*@__PURE__*/ new Vector3();
const _orientation = /*@__PURE__*/ new Vector3();

class PositionalAudio extends Audio {

	constructor( listener ) {

		super( listener );

		this.panner = this.context.createPanner();
		this.panner.panningModel = 'HRTF';
		this.panner.connect( this.gain );

	}

	connect() {

		super.connect();

		this.panner.connect( this.gain );

	}

	disconnect() {

		super.disconnect();

		this.panner.disconnect( this.gain );

	}

	getOutput() {

		return this.panner;

	}

	getRefDistance() {

		return this.panner.refDistance;

	}

	setRefDistance( value ) {

		this.panner.refDistance = value;

		return this;

	}

	getRolloffFactor() {

		return this.panner.rolloffFactor;

	}

	setRolloffFactor( value ) {

		this.panner.rolloffFactor = value;

		return this;

	}

	getDistanceModel() {

		return this.panner.distanceModel;

	}

	setDistanceModel( value ) {

		this.panner.distanceModel = value;

		return this;

	}

	getMaxDistance() {

		return this.panner.maxDistance;

	}

	setMaxDistance( value ) {

		this.panner.maxDistance = value;

		return this;

	}

	setDirectionalCone( coneInnerAngle, coneOuterAngle, coneOuterGain ) {

		this.panner.coneInnerAngle = coneInnerAngle;
		this.panner.coneOuterAngle = coneOuterAngle;
		this.panner.coneOuterGain = coneOuterGain;

		return this;

	}

	updateMatrixWorld( force ) {

		super.updateMatrixWorld( force );

		if ( this.hasPlaybackControl === true && this.isPlaying === false ) return;

		this.matrixWorld.decompose( _position, _quaternion, _scale );

		_orientation.set( 0, 0, 1 ).applyQuaternion( _quaternion );

		const panner = this.panner;

		if ( panner.positionX ) {

			// code path for Chrome and Firefox (see #14393)

			const endTime = this.context.currentTime + this.listener.timeDelta;

			panner.positionX.linearRampToValueAtTime( _position.x, endTime );
			panner.positionY.linearRampToValueAtTime( _position.y, endTime );
			panner.positionZ.linearRampToValueAtTime( _position.z, endTime );
			panner.orientationX.linearRampToValueAtTime( _orientation.x, endTime );
			panner.orientationY.linearRampToValueAtTime( _orientation.y, endTime );
			panner.orientationZ.linearRampToValueAtTime( _orientation.z, endTime );

		} else {

			panner.setPosition( _position.x, _position.y, _position.z );
			panner.setOrientation( _orientation.x, _orientation.y, _orientation.z );

		}

	}

}

class AudioAnalyser {

	constructor( audio, fftSize = 2048 ) {

		this.analyser = audio.context.createAnalyser();
		this.analyser.fftSize = fftSize;

		this.data = new Uint8Array( this.analyser.frequencyBinCount );

		audio.getOutput().connect( this.analyser );

	}


	getFrequencyData() {

		this.analyser.getByteFrequencyData( this.data );

		return this.data;

	}

	getAverageFrequency() {

		let value = 0;
		const data = this.getFrequencyData();

		for ( let i = 0; i < data.length; i ++ ) {

			value += data[ i ];

		}

		return value / data.length;

	}

}

class PropertyMixer {

	constructor( binding, typeName, valueSize ) {

		this.binding = binding;
		this.valueSize = valueSize;

		let mixFunction,
			mixFunctionAdditive,
			setIdentity;

		// buffer layout: [ incoming | accu0 | accu1 | orig | addAccu | (optional work) ]
		//
		// interpolators can use .buffer as their .result
		// the data then goes to 'incoming'
		//
		// 'accu0' and 'accu1' are used frame-interleaved for
		// the cumulative result and are compared to detect
		// changes
		//
		// 'orig' stores the original state of the property
		//
		// 'add' is used for additive cumulative results
		//
		// 'work' is optional and is only present for quaternion types. It is used
		// to store intermediate quaternion multiplication results

		switch ( typeName ) {

			case 'quaternion':
				mixFunction = this._slerp;
				mixFunctionAdditive = this._slerpAdditive;
				setIdentity = this._setAdditiveIdentityQuaternion;

				this.buffer = new Float64Array( valueSize * 6 );
				this._workIndex = 5;
				break;

			case 'string':
			case 'bool':
				mixFunction = this._select;

				// Use the regular mix function and for additive on these types,
				// additive is not relevant for non-numeric types
				mixFunctionAdditive = this._select;

				setIdentity = this._setAdditiveIdentityOther;

				this.buffer = new Array( valueSize * 5 );
				break;

			default:
				mixFunction = this._lerp;
				mixFunctionAdditive = this._lerpAdditive;
				setIdentity = this._setAdditiveIdentityNumeric;

				this.buffer = new Float64Array( valueSize * 5 );

		}

		this._mixBufferRegion = mixFunction;
		this._mixBufferRegionAdditive = mixFunctionAdditive;
		this._setIdentity = setIdentity;
		this._origIndex = 3;
		this._addIndex = 4;

		this.cumulativeWeight = 0;
		this.cumulativeWeightAdditive = 0;

		this.useCount = 0;
		this.referenceCount = 0;

	}

	// accumulate data in the 'incoming' region into 'accu<i>'
	accumulate( accuIndex, weight ) {

		// note: happily accumulating nothing when weight = 0, the caller knows
		// the weight and shouldn't have made the call in the first place

		const buffer = this.buffer,
			stride = this.valueSize,
			offset = accuIndex * stride + stride;

		let currentWeight = this.cumulativeWeight;

		if ( currentWeight === 0 ) {

			// accuN := incoming * weight

			for ( let i = 0; i !== stride; ++ i ) {

				buffer[ offset + i ] = buffer[ i ];

			}

			currentWeight = weight;

		} else {

			// accuN := accuN + incoming * weight

			currentWeight += weight;
			const mix = weight / currentWeight;
			this._mixBufferRegion( buffer, offset, 0, mix, stride );

		}

		this.cumulativeWeight = currentWeight;

	}

	// accumulate data in the 'incoming' region into 'add'
	accumulateAdditive( weight ) {

		const buffer = this.buffer,
			stride = this.valueSize,
			offset = stride * this._addIndex;

		if ( this.cumulativeWeightAdditive === 0 ) {

			// add = identity

			this._setIdentity();

		}

		// add := add + incoming * weight

		this._mixBufferRegionAdditive( buffer, offset, 0, weight, stride );
		this.cumulativeWeightAdditive += weight;

	}

	// apply the state of 'accu<i>' to the binding when accus differ
	apply( accuIndex ) {

		const stride = this.valueSize,
			buffer = this.buffer,
			offset = accuIndex * stride + stride,

			weight = this.cumulativeWeight,
			weightAdditive = this.cumulativeWeightAdditive,

			binding = this.binding;

		this.cumulativeWeight = 0;
		this.cumulativeWeightAdditive = 0;

		if ( weight < 1 ) {

			// accuN := accuN + original * ( 1 - cumulativeWeight )

			const originalValueOffset = stride * this._origIndex;

			this._mixBufferRegion(
				buffer, offset, originalValueOffset, 1 - weight, stride );

		}

		if ( weightAdditive > 0 ) {

			// accuN := accuN + additive accuN

			this._mixBufferRegionAdditive( buffer, offset, this._addIndex * stride, 1, stride );

		}

		for ( let i = stride, e = stride + stride; i !== e; ++ i ) {

			if ( buffer[ i ] !== buffer[ i + stride ] ) {

				// value has changed -> update scene graph

				binding.setValue( buffer, offset );
				break;

			}

		}

	}

	// remember the state of the bound property and copy it to both accus
	saveOriginalState() {

		const binding = this.binding;

		const buffer = this.buffer,
			stride = this.valueSize,

			originalValueOffset = stride * this._origIndex;

		binding.getValue( buffer, originalValueOffset );

		// accu[0..1] := orig -- initially detect changes against the original
		for ( let i = stride, e = originalValueOffset; i !== e; ++ i ) {

			buffer[ i ] = buffer[ originalValueOffset + ( i % stride ) ];

		}

		// Add to identity for additive
		this._setIdentity();

		this.cumulativeWeight = 0;
		this.cumulativeWeightAdditive = 0;

	}

	// apply the state previously taken via 'saveOriginalState' to the binding
	restoreOriginalState() {

		const originalValueOffset = this.valueSize * 3;
		this.binding.setValue( this.buffer, originalValueOffset );

	}

	_setAdditiveIdentityNumeric() {

		const startIndex = this._addIndex * this.valueSize;
		const endIndex = startIndex + this.valueSize;

		for ( let i = startIndex; i < endIndex; i ++ ) {

			this.buffer[ i ] = 0;

		}

	}

	_setAdditiveIdentityQuaternion() {

		this._setAdditiveIdentityNumeric();
		this.buffer[ this._addIndex * this.valueSize + 3 ] = 1;

	}

	_setAdditiveIdentityOther() {

		const startIndex = this._origIndex * this.valueSize;
		const targetIndex = this._addIndex * this.valueSize;

		for ( let i = 0; i < this.valueSize; i ++ ) {

			this.buffer[ targetIndex + i ] = this.buffer[ startIndex + i ];

		}

	}


	// mix functions

	_select( buffer, dstOffset, srcOffset, t, stride ) {

		if ( t >= 0.5 ) {

			for ( let i = 0; i !== stride; ++ i ) {

				buffer[ dstOffset + i ] = buffer[ srcOffset + i ];

			}

		}

	}

	_slerp( buffer, dstOffset, srcOffset, t ) {

		Quaternion.slerpFlat( buffer, dstOffset, buffer, dstOffset, buffer, srcOffset, t );

	}

	_slerpAdditive( buffer, dstOffset, srcOffset, t, stride ) {

		const workOffset = this._workIndex * stride;

		// Store result in intermediate buffer offset
		Quaternion.multiplyQuaternionsFlat( buffer, workOffset, buffer, dstOffset, buffer, srcOffset );

		// Slerp to the intermediate result
		Quaternion.slerpFlat( buffer, dstOffset, buffer, dstOffset, buffer, workOffset, t );

	}

	_lerp( buffer, dstOffset, srcOffset, t, stride ) {

		const s = 1 - t;

		for ( let i = 0; i !== stride; ++ i ) {

			const j = dstOffset + i;

			buffer[ j ] = buffer[ j ] * s + buffer[ srcOffset + i ] * t;

		}

	}

	_lerpAdditive( buffer, dstOffset, srcOffset, t, stride ) {

		for ( let i = 0; i !== stride; ++ i ) {

			const j = dstOffset + i;

			buffer[ j ] = buffer[ j ] + buffer[ srcOffset + i ] * t;

		}

	}

}

// Characters [].:/ are reserved for track binding syntax.
const _RESERVED_CHARS_RE = '\\[\\]\\.:\\/';
const _reservedRe = new RegExp( '[' + _RESERVED_CHARS_RE + ']', 'g' );

// Attempts to allow node names from any language. ES5's `\w` regexp matches
// only latin characters, and the unicode \p{L} is not yet supported. So
// instead, we exclude reserved characters and match everything else.
const _wordChar = '[^' + _RESERVED_CHARS_RE + ']';
const _wordCharOrDot = '[^' + _RESERVED_CHARS_RE.replace( '\\.', '' ) + ']';

// Parent directories, delimited by '/' or ':'. Currently unused, but must
// be matched to parse the rest of the track name.
const _directoryRe = /*@__PURE__*/ /((?:WC+[\/:])*)/.source.replace( 'WC', _wordChar );

// Target node. May contain word characters (a-zA-Z0-9_) and '.' or '-'.
const _nodeRe = /*@__PURE__*/ /(WCOD+)?/.source.replace( 'WCOD', _wordCharOrDot );

// Object on target node, and accessor. May not contain reserved
// characters. Accessor may contain any character except closing bracket.
const _objectRe = /*@__PURE__*/ /(?:\.(WC+)(?:\[(.+)\])?)?/.source.replace( 'WC', _wordChar );

// Property and accessor. May not contain reserved characters. Accessor may
// contain any non-bracket characters.
const _propertyRe = /*@__PURE__*/ /\.(WC+)(?:\[(.+)\])?/.source.replace( 'WC', _wordChar );

const _trackRe = new RegExp( ''
	+ '^'
	+ _directoryRe
	+ _nodeRe
	+ _objectRe
	+ _propertyRe
	+ '$'
);

const _supportedObjectNames = [ 'material', 'materials', 'bones', 'map' ];

class Composite {

	constructor( targetGroup, path, optionalParsedPath ) {

		const parsedPath = optionalParsedPath || PropertyBinding.parseTrackName( path );

		this._targetGroup = targetGroup;
		this._bindings = targetGroup.subscribe_( path, parsedPath );

	}

	getValue( array, offset ) {

		this.bind(); // bind all binding

		const firstValidIndex = this._targetGroup.nCachedObjects_,
			binding = this._bindings[ firstValidIndex ];

		// and only call .getValue on the first
		if ( binding !== undefined ) binding.getValue( array, offset );

	}

	setValue( array, offset ) {

		const bindings = this._bindings;

		for ( let i = this._targetGroup.nCachedObjects_, n = bindings.length; i !== n; ++ i ) {

			bindings[ i ].setValue( array, offset );

		}

	}

	bind() {

		const bindings = this._bindings;

		for ( let i = this._targetGroup.nCachedObjects_, n = bindings.length; i !== n; ++ i ) {

			bindings[ i ].bind();

		}

	}

	unbind() {

		const bindings = this._bindings;

		for ( let i = this._targetGroup.nCachedObjects_, n = bindings.length; i !== n; ++ i ) {

			bindings[ i ].unbind();

		}

	}

}

// Note: This class uses a State pattern on a per-method basis:
// 'bind' sets 'this.getValue' / 'setValue' and shadows the
// prototype version of these methods with one that represents
// the bound state. When the property is not found, the methods
// become no-ops.
class PropertyBinding {

	constructor( rootNode, path, parsedPath ) {

		this.path = path;
		this.parsedPath = parsedPath || PropertyBinding.parseTrackName( path );

		this.node = PropertyBinding.findNode( rootNode, this.parsedPath.nodeName );

		this.rootNode = rootNode;

		// initial state of these methods that calls 'bind'
		this.getValue = this._getValue_unbound;
		this.setValue = this._setValue_unbound;

	}


	static create( root, path, parsedPath ) {

		if ( ! ( root && root.isAnimationObjectGroup ) ) {

			return new PropertyBinding( root, path, parsedPath );

		} else {

			return new PropertyBinding.Composite( root, path, parsedPath );

		}

	}

	/**
	 * Replaces spaces with underscores and removes unsupported characters from
	 * node names, to ensure compatibility with parseTrackName().
	 *
	 * @param {string} name Node name to be sanitized.
	 * @return {string}
	 */
	static sanitizeNodeName( name ) {

		return name.replace( /\s/g, '_' ).replace( _reservedRe, '' );

	}

	static parseTrackName( trackName ) {

		const matches = _trackRe.exec( trackName );

		if ( matches === null ) {

			throw new Error( 'PropertyBinding: Cannot parse trackName: ' + trackName );

		}

		const results = {
			// directoryName: matches[ 1 ], // (tschw) currently unused
			nodeName: matches[ 2 ],
			objectName: matches[ 3 ],
			objectIndex: matches[ 4 ],
			propertyName: matches[ 5 ], // required
			propertyIndex: matches[ 6 ]
		};

		const lastDot = results.nodeName && results.nodeName.lastIndexOf( '.' );

		if ( lastDot !== undefined && lastDot !== - 1 ) {

			const objectName = results.nodeName.substring( lastDot + 1 );

			// Object names must be checked against an allowlist. Otherwise, there
			// is no way to parse 'foo.bar.baz': 'baz' must be a property, but
			// 'bar' could be the objectName, or part of a nodeName (which can
			// include '.' characters).
			if ( _supportedObjectNames.indexOf( objectName ) !== - 1 ) {

				results.nodeName = results.nodeName.substring( 0, lastDot );
				results.objectName = objectName;

			}

		}

		if ( results.propertyName === null || results.propertyName.length === 0 ) {

			throw new Error( 'PropertyBinding: can not parse propertyName from trackName: ' + trackName );

		}

		return results;

	}

	static findNode( root, nodeName ) {

		if ( nodeName === undefined || nodeName === '' || nodeName === '.' || nodeName === - 1 || nodeName === root.name || nodeName === root.uuid ) {

			return root;

		}

		// search into skeleton bones.
		if ( root.skeleton ) {

			const bone = root.skeleton.getBoneByName( nodeName );

			if ( bone !== undefined ) {

				return bone;

			}

		}

		// search into node subtree.
		if ( root.children ) {

			const searchNodeSubtree = function ( children ) {

				for ( let i = 0; i < children.length; i ++ ) {

					const childNode = children[ i ];

					if ( childNode.name === nodeName || childNode.uuid === nodeName ) {

						return childNode;

					}

					const result = searchNodeSubtree( childNode.children );

					if ( result ) return result;

				}

				return null;

			};

			const subTreeNode = searchNodeSubtree( root.children );

			if ( subTreeNode ) {

				return subTreeNode;

			}

		}

		return null;

	}

	// these are used to "bind" a nonexistent property
	_getValue_unavailable() {}
	_setValue_unavailable() {}

	// Getters

	_getValue_direct( buffer, offset ) {

		buffer[ offset ] = this.targetObject[ this.propertyName ];

	}

	_getValue_array( buffer, offset ) {

		const source = this.resolvedProperty;

		for ( let i = 0, n = source.length; i !== n; ++ i ) {

			buffer[ offset ++ ] = source[ i ];

		}

	}

	_getValue_arrayElement( buffer, offset ) {

		buffer[ offset ] = this.resolvedProperty[ this.propertyIndex ];

	}

	_getValue_toArray( buffer, offset ) {

		this.resolvedProperty.toArray( buffer, offset );

	}

	// Direct

	_setValue_direct( buffer, offset ) {

		this.targetObject[ this.propertyName ] = buffer[ offset ];

	}

	_setValue_direct_setNeedsUpdate( buffer, offset ) {

		this.targetObject[ this.propertyName ] = buffer[ offset ];
		this.targetObject.needsUpdate = true;

	}

	_setValue_direct_setMatrixWorldNeedsUpdate( buffer, offset ) {

		this.targetObject[ this.propertyName ] = buffer[ offset ];
		this.targetObject.matrixWorldNeedsUpdate = true;

	}

	// EntireArray

	_setValue_array( buffer, offset ) {

		const dest = this.resolvedProperty;

		for ( let i = 0, n = dest.length; i !== n; ++ i ) {

			dest[ i ] = buffer[ offset ++ ];

		}

	}

	_setValue_array_setNeedsUpdate( buffer, offset ) {

		const dest = this.resolvedProperty;

		for ( let i = 0, n = dest.length; i !== n; ++ i ) {

			dest[ i ] = buffer[ offset ++ ];

		}

		this.targetObject.needsUpdate = true;

	}

	_setValue_array_setMatrixWorldNeedsUpdate( buffer, offset ) {

		const dest = this.resolvedProperty;

		for ( let i = 0, n = dest.length; i !== n; ++ i ) {

			dest[ i ] = buffer[ offset ++ ];

		}

		this.targetObject.matrixWorldNeedsUpdate = true;

	}

	// ArrayElement

	_setValue_arrayElement( buffer, offset ) {

		this.resolvedProperty[ this.propertyIndex ] = buffer[ offset ];

	}

	_setValue_arrayElement_setNeedsUpdate( buffer, offset ) {

		this.resolvedProperty[ this.propertyIndex ] = buffer[ offset ];
		this.targetObject.needsUpdate = true;

	}

	_setValue_arrayElement_setMatrixWorldNeedsUpdate( buffer, offset ) {

		this.resolvedProperty[ this.propertyIndex ] = buffer[ offset ];
		this.targetObject.matrixWorldNeedsUpdate = true;

	}

	// HasToFromArray

	_setValue_fromArray( buffer, offset ) {

		this.resolvedProperty.fromArray( buffer, offset );

	}

	_setValue_fromArray_setNeedsUpdate( buffer, offset ) {

		this.resolvedProperty.fromArray( buffer, offset );
		this.targetObject.needsUpdate = true;

	}

	_setValue_fromArray_setMatrixWorldNeedsUpdate( buffer, offset ) {

		this.resolvedProperty.fromArray( buffer, offset );
		this.targetObject.matrixWorldNeedsUpdate = true;

	}

	_getValue_unbound( targetArray, offset ) {

		this.bind();
		this.getValue( targetArray, offset );

	}

	_setValue_unbound( sourceArray, offset ) {

		this.bind();
		this.setValue( sourceArray, offset );

	}

	// create getter / setter pair for a property in the scene graph
	bind() {

		let targetObject = this.node;
		const parsedPath = this.parsedPath;

		const objectName = parsedPath.objectName;
		const propertyName = parsedPath.propertyName;
		let propertyIndex = parsedPath.propertyIndex;

		if ( ! targetObject ) {

			targetObject = PropertyBinding.findNode( this.rootNode, parsedPath.nodeName );

			this.node = targetObject;

		}

		// set fail state so we can just 'return' on error
		this.getValue = this._getValue_unavailable;
		this.setValue = this._setValue_unavailable;

		// ensure there is a value node
		if ( ! targetObject ) {

			console.warn( 'THREE.PropertyBinding: No target node found for track: ' + this.path + '.' );
			return;

		}

		if ( objectName ) {

			let objectIndex = parsedPath.objectIndex;

			// special cases were we need to reach deeper into the hierarchy to get the face materials....
			switch ( objectName ) {

				case 'materials':

					if ( ! targetObject.material ) {

						console.error( 'THREE.PropertyBinding: Can not bind to material as node does not have a material.', this );
						return;

					}

					if ( ! targetObject.material.materials ) {

						console.error( 'THREE.PropertyBinding: Can not bind to material.materials as node.material does not have a materials array.', this );
						return;

					}

					targetObject = targetObject.material.materials;

					break;

				case 'bones':

					if ( ! targetObject.skeleton ) {

						console.error( 'THREE.PropertyBinding: Can not bind to bones as node does not have a skeleton.', this );
						return;

					}

					// potential future optimization: skip this if propertyIndex is already an integer
					// and convert the integer string to a true integer.

					targetObject = targetObject.skeleton.bones;

					// support resolving morphTarget names into indices.
					for ( let i = 0; i < targetObject.length; i ++ ) {

						if ( targetObject[ i ].name === objectIndex ) {

							objectIndex = i;
							break;

						}

					}

					break;

				case 'map':

					if ( 'map' in targetObject ) {

						targetObject = targetObject.map;
						break;

					}

					if ( ! targetObject.material ) {

						console.error( 'THREE.PropertyBinding: Can not bind to material as node does not have a material.', this );
						return;

					}

					if ( ! targetObject.material.map ) {

						console.error( 'THREE.PropertyBinding: Can not bind to material.map as node.material does not have a map.', this );
						return;

					}

					targetObject = targetObject.material.map;
					break;

				default:

					if ( targetObject[ objectName ] === undefined ) {

						console.error( 'THREE.PropertyBinding: Can not bind to objectName of node undefined.', this );
						return;

					}

					targetObject = targetObject[ objectName ];

			}


			if ( objectIndex !== undefined ) {

				if ( targetObject[ objectIndex ] === undefined ) {

					console.error( 'THREE.PropertyBinding: Trying to bind to objectIndex of objectName, but is undefined.', this, targetObject );
					return;

				}

				targetObject = targetObject[ objectIndex ];

			}

		}

		// resolve property
		const nodeProperty = targetObject[ propertyName ];

		if ( nodeProperty === undefined ) {

			const nodeName = parsedPath.nodeName;

			console.error( 'THREE.PropertyBinding: Trying to update property for track: ' + nodeName +
				'.' + propertyName + ' but it wasn\'t found.', targetObject );
			return;

		}

		// determine versioning scheme
		let versioning = this.Versioning.None;

		this.targetObject = targetObject;

		if ( targetObject.needsUpdate !== undefined ) { // material

			versioning = this.Versioning.NeedsUpdate;

		} else if ( targetObject.matrixWorldNeedsUpdate !== undefined ) { // node transform

			versioning = this.Versioning.MatrixWorldNeedsUpdate;

		}

		// determine how the property gets bound
		let bindingType = this.BindingType.Direct;

		if ( propertyIndex !== undefined ) {

			// access a sub element of the property array (only primitives are supported right now)

			if ( propertyName === 'morphTargetInfluences' ) {

				// potential optimization, skip this if propertyIndex is already an integer, and convert the integer string to a true integer.

				// support resolving morphTarget names into indices.
				if ( ! targetObject.geometry ) {

					console.error( 'THREE.PropertyBinding: Can not bind to morphTargetInfluences because node does not have a geometry.', this );
					return;

				}

				if ( ! targetObject.geometry.morphAttributes ) {

					console.error( 'THREE.PropertyBinding: Can not bind to morphTargetInfluences because node does not have a geometry.morphAttributes.', this );
					return;

				}

				if ( targetObject.morphTargetDictionary[ propertyIndex ] !== undefined ) {

					propertyIndex = targetObject.morphTargetDictionary[ propertyIndex ];

				}

			}

			bindingType = this.BindingType.ArrayElement;

			this.resolvedProperty = nodeProperty;
			this.propertyIndex = propertyIndex;

		} else if ( nodeProperty.fromArray !== undefined && nodeProperty.toArray !== undefined ) {

			// must use copy for Object3D.Euler/Quaternion

			bindingType = this.BindingType.HasFromToArray;

			this.resolvedProperty = nodeProperty;

		} else if ( Array.isArray( nodeProperty ) ) {

			bindingType = this.BindingType.EntireArray;

			this.resolvedProperty = nodeProperty;

		} else {

			this.propertyName = propertyName;

		}

		// select getter / setter
		this.getValue = this.GetterByBindingType[ bindingType ];
		this.setValue = this.SetterByBindingTypeAndVersioning[ bindingType ][ versioning ];

	}

	unbind() {

		this.node = null;

		// back to the prototype version of getValue / setValue
		// note: avoiding to mutate the shape of 'this' via 'delete'
		this.getValue = this._getValue_unbound;
		this.setValue = this._setValue_unbound;

	}

}

PropertyBinding.Composite = Composite;

PropertyBinding.prototype.BindingType = {
	Direct: 0,
	EntireArray: 1,
	ArrayElement: 2,
	HasFromToArray: 3
};

PropertyBinding.prototype.Versioning = {
	None: 0,
	NeedsUpdate: 1,
	MatrixWorldNeedsUpdate: 2
};

PropertyBinding.prototype.GetterByBindingType = [

	PropertyBinding.prototype._getValue_direct,
	PropertyBinding.prototype._getValue_array,
	PropertyBinding.prototype._getValue_arrayElement,
	PropertyBinding.prototype._getValue_toArray,

];

PropertyBinding.prototype.SetterByBindingTypeAndVersioning = [

	[
		// Direct
		PropertyBinding.prototype._setValue_direct,
		PropertyBinding.prototype._setValue_direct_setNeedsUpdate,
		PropertyBinding.prototype._setValue_direct_setMatrixWorldNeedsUpdate,

	], [

		// EntireArray

		PropertyBinding.prototype._setValue_array,
		PropertyBinding.prototype._setValue_array_setNeedsUpdate,
		PropertyBinding.prototype._setValue_array_setMatrixWorldNeedsUpdate,

	], [

		// ArrayElement
		PropertyBinding.prototype._setValue_arrayElement,
		PropertyBinding.prototype._setValue_arrayElement_setNeedsUpdate,
		PropertyBinding.prototype._setValue_arrayElement_setMatrixWorldNeedsUpdate,

	], [

		// HasToFromArray
		PropertyBinding.prototype._setValue_fromArray,
		PropertyBinding.prototype._setValue_fromArray_setNeedsUpdate,
		PropertyBinding.prototype._setValue_fromArray_setMatrixWorldNeedsUpdate,

	]

];

/**
 *
 * A group of objects that receives a shared animation state.
 *
 * Usage:
 *
 *  - Add objects you would otherwise pass as 'root' to the
 *    constructor or the .clipAction method of AnimationMixer.
 *
 *  - Instead pass this object as 'root'.
 *
 *  - You can also add and remove objects later when the mixer
 *    is running.
 *
 * Note:
 *
 *    Objects of this class appear as one object to the mixer,
 *    so cache control of the individual objects must be done
 *    on the group.
 *
 * Limitation:
 *
 *  - The animated properties must be compatible among the
 *    all objects in the group.
 *
 *  - A single property can either be controlled through a
 *    target group or directly, but not both.
 */

class AnimationObjectGroup {

	constructor() {

		this.isAnimationObjectGroup = true;

		this.uuid = generateUUID();

		// cached objects followed by the active ones
		this._objects = Array.prototype.slice.call( arguments );

		this.nCachedObjects_ = 0; // threshold
		// note: read by PropertyBinding.Composite

		const indices = {};
		this._indicesByUUID = indices; // for bookkeeping

		for ( let i = 0, n = arguments.length; i !== n; ++ i ) {

			indices[ arguments[ i ].uuid ] = i;

		}

		this._paths = []; // inside: string
		this._parsedPaths = []; // inside: { we don't care, here }
		this._bindings = []; // inside: Array< PropertyBinding >
		this._bindingsIndicesByPath = {}; // inside: indices in these arrays

		const scope = this;

		this.stats = {

			objects: {
				get total() {

					return scope._objects.length;

				},
				get inUse() {

					return this.total - scope.nCachedObjects_;

				}
			},
			get bindingsPerObject() {

				return scope._bindings.length;

			}

		};

	}

	add() {

		const objects = this._objects,
			indicesByUUID = this._indicesByUUID,
			paths = this._paths,
			parsedPaths = this._parsedPaths,
			bindings = this._bindings,
			nBindings = bindings.length;

		let knownObject = undefined,
			nObjects = objects.length,
			nCachedObjects = this.nCachedObjects_;

		for ( let i = 0, n = arguments.length; i !== n; ++ i ) {

			const object = arguments[ i ],
				uuid = object.uuid;
			let index = indicesByUUID[ uuid ];

			if ( index === undefined ) {

				// unknown object -> add it to the ACTIVE region

				index = nObjects ++;
				indicesByUUID[ uuid ] = index;
				objects.push( object );

				// accounting is done, now do the same for all bindings

				for ( let j = 0, m = nBindings; j !== m; ++ j ) {

					bindings[ j ].push( new PropertyBinding( object, paths[ j ], parsedPaths[ j ] ) );

				}

			} else if ( index < nCachedObjects ) {

				knownObject = objects[ index ];

				// move existing object to the ACTIVE region

				const firstActiveIndex = -- nCachedObjects,
					lastCachedObject = objects[ firstActiveIndex ];

				indicesByUUID[ lastCachedObject.uuid ] = index;
				objects[ index ] = lastCachedObject;

				indicesByUUID[ uuid ] = firstActiveIndex;
				objects[ firstActiveIndex ] = object;

				// accounting is done, now do the same for all bindings

				for ( let j = 0, m = nBindings; j !== m; ++ j ) {

					const bindingsForPath = bindings[ j ],
						lastCached = bindingsForPath[ firstActiveIndex ];

					let binding = bindingsForPath[ index ];

					bindingsForPath[ index ] = lastCached;

					if ( binding === undefined ) {

						// since we do not bother to create new bindings
						// for objects that are cached, the binding may
						// or may not exist

						binding = new PropertyBinding( object, paths[ j ], parsedPaths[ j ] );

					}

					bindingsForPath[ firstActiveIndex ] = binding;

				}

			} else if ( objects[ index ] !== knownObject ) {

				console.error( 'THREE.AnimationObjectGroup: Different objects with the same UUID ' +
					'detected. Clean the caches or recreate your infrastructure when reloading scenes.' );

			} // else the object is already where we want it to be

		} // for arguments

		this.nCachedObjects_ = nCachedObjects;

	}

	remove() {

		const objects = this._objects,
			indicesByUUID = this._indicesByUUID,
			bindings = this._bindings,
			nBindings = bindings.length;

		let nCachedObjects = this.nCachedObjects_;

		for ( let i = 0, n = arguments.length; i !== n; ++ i ) {

			const object = arguments[ i ],
				uuid = object.uuid,
				index = indicesByUUID[ uuid ];

			if ( index !== undefined && index >= nCachedObjects ) {

				// move existing object into the CACHED region

				const lastCachedIndex = nCachedObjects ++,
					firstActiveObject = objects[ lastCachedIndex ];

				indicesByUUID[ firstActiveObject.uuid ] = index;
				objects[ index ] = firstActiveObject;

				indicesByUUID[ uuid ] = lastCachedIndex;
				objects[ lastCachedIndex ] = object;

				// accounting is done, now do the same for all bindings

				for ( let j = 0, m = nBindings; j !== m; ++ j ) {

					const bindingsForPath = bindings[ j ],
						firstActive = bindingsForPath[ lastCachedIndex ],
						binding = bindingsForPath[ index ];

					bindingsForPath[ index ] = firstActive;
					bindingsForPath[ lastCachedIndex ] = binding;

				}

			}

		} // for arguments

		this.nCachedObjects_ = nCachedObjects;

	}

	// remove & forget
	uncache() {

		const objects = this._objects,
			indicesByUUID = this._indicesByUUID,
			bindings = this._bindings,
			nBindings = bindings.length;

		let nCachedObjects = this.nCachedObjects_,
			nObjects = objects.length;

		for ( let i = 0, n = arguments.length; i !== n; ++ i ) {

			const object = arguments[ i ],
				uuid = object.uuid,
				index = indicesByUUID[ uuid ];

			if ( index !== undefined ) {

				delete indicesByUUID[ uuid ];

				if ( index < nCachedObjects ) {

					// object is cached, shrink the CACHED region

					const firstActiveIndex = -- nCachedObjects,
						lastCachedObject = objects[ firstActiveIndex ],
						lastIndex = -- nObjects,
						lastObject = objects[ lastIndex ];

					// last cached object takes this object's place
					indicesByUUID[ lastCachedObject.uuid ] = index;
					objects[ index ] = lastCachedObject;

					// last object goes to the activated slot and pop
					indicesByUUID[ lastObject.uuid ] = firstActiveIndex;
					objects[ firstActiveIndex ] = lastObject;
					objects.pop();

					// accounting is done, now do the same for all bindings

					for ( let j = 0, m = nBindings; j !== m; ++ j ) {

						const bindingsForPath = bindings[ j ],
							lastCached = bindingsForPath[ firstActiveIndex ],
							last = bindingsForPath[ lastIndex ];

						bindingsForPath[ index ] = lastCached;
						bindingsForPath[ firstActiveIndex ] = last;
						bindingsForPath.pop();

					}

				} else {

					// object is active, just swap with the last and pop

					const lastIndex = -- nObjects,
						lastObject = objects[ lastIndex ];

					if ( lastIndex > 0 ) {

						indicesByUUID[ lastObject.uuid ] = index;

					}

					objects[ index ] = lastObject;
					objects.pop();

					// accounting is done, now do the same for all bindings

					for ( let j = 0, m = nBindings; j !== m; ++ j ) {

						const bindingsForPath = bindings[ j ];

						bindingsForPath[ index ] = bindingsForPath[ lastIndex ];
						bindingsForPath.pop();

					}

				} // cached or active

			} // if object is known

		} // for arguments

		this.nCachedObjects_ = nCachedObjects;

	}

	// Internal interface used by befriended PropertyBinding.Composite:

	subscribe_( path, parsedPath ) {

		// returns an array of bindings for the given path that is changed
		// according to the contained objects in the group

		const indicesByPath = this._bindingsIndicesByPath;
		let index = indicesByPath[ path ];
		const bindings = this._bindings;

		if ( index !== undefined ) return bindings[ index ];

		const paths = this._paths,
			parsedPaths = this._parsedPaths,
			objects = this._objects,
			nObjects = objects.length,
			nCachedObjects = this.nCachedObjects_,
			bindingsForPath = new Array( nObjects );

		index = bindings.length;

		indicesByPath[ path ] = index;

		paths.push( path );
		parsedPaths.push( parsedPath );
		bindings.push( bindingsForPath );

		for ( let i = nCachedObjects, n = objects.length; i !== n; ++ i ) {

			const object = objects[ i ];
			bindingsForPath[ i ] = new PropertyBinding( object, path, parsedPath );

		}

		return bindingsForPath;

	}

	unsubscribe_( path ) {

		// tells the group to forget about a property path and no longer
		// update the array previously obtained with 'subscribe_'

		const indicesByPath = this._bindingsIndicesByPath,
			index = indicesByPath[ path ];

		if ( index !== undefined ) {

			const paths = this._paths,
				parsedPaths = this._parsedPaths,
				bindings = this._bindings,
				lastBindingsIndex = bindings.length - 1,
				lastBindings = bindings[ lastBindingsIndex ],
				lastBindingsPath = path[ lastBindingsIndex ];

			indicesByPath[ lastBindingsPath ] = index;

			bindings[ index ] = lastBindings;
			bindings.pop();

			parsedPaths[ index ] = parsedPaths[ lastBindingsIndex ];
			parsedPaths.pop();

			paths[ index ] = paths[ lastBindingsIndex ];
			paths.pop();

		}

	}

}

class AnimationAction {

	constructor( mixer, clip, localRoot = null, blendMode = clip.blendMode ) {

		this._mixer = mixer;
		this._clip = clip;
		this._localRoot = localRoot;
		this.blendMode = blendMode;

		const tracks = clip.tracks,
			nTracks = tracks.length,
			interpolants = new Array( nTracks );

		const interpolantSettings = {
			endingStart: ZeroCurvatureEnding,
			endingEnd: ZeroCurvatureEnding
		};

		for ( let i = 0; i !== nTracks; ++ i ) {

			const interpolant = tracks[ i ].createInterpolant( null );
			interpolants[ i ] = interpolant;
			interpolant.settings = interpolantSettings;

		}

		this._interpolantSettings = interpolantSettings;

		this._interpolants = interpolants; // bound by the mixer

		// inside: PropertyMixer (managed by the mixer)
		this._propertyBindings = new Array( nTracks );

		this._cacheIndex = null; // for the memory manager
		this._byClipCacheIndex = null; // for the memory manager

		this._timeScaleInterpolant = null;
		this._weightInterpolant = null;

		this.loop = LoopRepeat;
		this._loopCount = - 1;

		// global mixer time when the action is to be started
		// it's set back to 'null' upon start of the action
		this._startTime = null;

		// scaled local time of the action
		// gets clamped or wrapped to 0..clip.duration according to loop
		this.time = 0;

		this.timeScale = 1;
		this._effectiveTimeScale = 1;

		this.weight = 1;
		this._effectiveWeight = 1;

		this.repetitions = Infinity; // no. of repetitions when looping

		this.paused = false; // true -> zero effective time scale
		this.enabled = true; // false -> zero effective weight

		this.clampWhenFinished = false;// keep feeding the last frame?

		this.zeroSlopeAtStart = true;// for smooth interpolation w/o separate
		this.zeroSlopeAtEnd = true;// clips for start, loop and end

	}

	// State & Scheduling

	play() {

		this._mixer._activateAction( this );

		return this;

	}

	stop() {

		this._mixer._deactivateAction( this );

		return this.reset();

	}

	reset() {

		this.paused = false;
		this.enabled = true;

		this.time = 0; // restart clip
		this._loopCount = - 1;// forget previous loops
		this._startTime = null;// forget scheduling

		return this.stopFading().stopWarping();

	}

	isRunning() {

		return this.enabled && ! this.paused && this.timeScale !== 0 &&
			this._startTime === null && this._mixer._isActiveAction( this );

	}

	// return true when play has been called
	isScheduled() {

		return this._mixer._isActiveAction( this );

	}

	startAt( time ) {

		this._startTime = time;

		return this;

	}

	setLoop( mode, repetitions ) {

		this.loop = mode;
		this.repetitions = repetitions;

		return this;

	}

	// Weight

	// set the weight stopping any scheduled fading
	// although .enabled = false yields an effective weight of zero, this
	// method does *not* change .enabled, because it would be confusing
	setEffectiveWeight( weight ) {

		this.weight = weight;

		// note: same logic as when updated at runtime
		this._effectiveWeight = this.enabled ? weight : 0;

		return this.stopFading();

	}

	// return the weight considering fading and .enabled
	getEffectiveWeight() {

		return this._effectiveWeight;

	}

	fadeIn( duration ) {

		return this._scheduleFading( duration, 0, 1 );

	}

	fadeOut( duration ) {

		return this._scheduleFading( duration, 1, 0 );

	}

	crossFadeFrom( fadeOutAction, duration, warp ) {

		fadeOutAction.fadeOut( duration );
		this.fadeIn( duration );

		if ( warp ) {

			const fadeInDuration = this._clip.duration,
				fadeOutDuration = fadeOutAction._clip.duration,

				startEndRatio = fadeOutDuration / fadeInDuration,
				endStartRatio = fadeInDuration / fadeOutDuration;

			fadeOutAction.warp( 1.0, startEndRatio, duration );
			this.warp( endStartRatio, 1.0, duration );

		}

		return this;

	}

	crossFadeTo( fadeInAction, duration, warp ) {

		return fadeInAction.crossFadeFrom( this, duration, warp );

	}

	stopFading() {

		const weightInterpolant = this._weightInterpolant;

		if ( weightInterpolant !== null ) {

			this._weightInterpolant = null;
			this._mixer._takeBackControlInterpolant( weightInterpolant );

		}

		return this;

	}

	// Time Scale Control

	// set the time scale stopping any scheduled warping
	// although .paused = true yields an effective time scale of zero, this
	// method does *not* change .paused, because it would be confusing
	setEffectiveTimeScale( timeScale ) {

		this.timeScale = timeScale;
		this._effectiveTimeScale = this.paused ? 0 : timeScale;

		return this.stopWarping();

	}

	// return the time scale considering warping and .paused
	getEffectiveTimeScale() {

		return this._effectiveTimeScale;

	}

	setDuration( duration ) {

		this.timeScale = this._clip.duration / duration;

		return this.stopWarping();

	}

	syncWith( action ) {

		this.time = action.time;
		this.timeScale = action.timeScale;

		return this.stopWarping();

	}

	halt( duration ) {

		return this.warp( this._effectiveTimeScale, 0, duration );

	}

	warp( startTimeScale, endTimeScale, duration ) {

		const mixer = this._mixer,
			now = mixer.time,
			timeScale = this.timeScale;

		let interpolant = this._timeScaleInterpolant;

		if ( interpolant === null ) {

			interpolant = mixer._lendControlInterpolant();
			this._timeScaleInterpolant = interpolant;

		}

		const times = interpolant.parameterPositions,
			values = interpolant.sampleValues;

		times[ 0 ] = now;
		times[ 1 ] = now + duration;

		values[ 0 ] = startTimeScale / timeScale;
		values[ 1 ] = endTimeScale / timeScale;

		return this;

	}

	stopWarping() {

		const timeScaleInterpolant = this._timeScaleInterpolant;

		if ( timeScaleInterpolant !== null ) {

			this._timeScaleInterpolant = null;
			this._mixer._takeBackControlInterpolant( timeScaleInterpolant );

		}

		return this;

	}

	// Object Accessors

	getMixer() {

		return this._mixer;

	}

	getClip() {

		return this._clip;

	}

	getRoot() {

		return this._localRoot || this._mixer._root;

	}

	// Interna

	_update( time, deltaTime, timeDirection, accuIndex ) {

		// called by the mixer

		if ( ! this.enabled ) {

			// call ._updateWeight() to update ._effectiveWeight

			this._updateWeight( time );
			return;

		}

		const startTime = this._startTime;

		if ( startTime !== null ) {

			// check for scheduled start of action

			const timeRunning = ( time - startTime ) * timeDirection;
			if ( timeRunning < 0 || timeDirection === 0 ) {

				deltaTime = 0;

			} else {


				this._startTime = null; // unschedule
				deltaTime = timeDirection * timeRunning;

			}

		}

		// apply time scale and advance time

		deltaTime *= this._updateTimeScale( time );
		const clipTime = this._updateTime( deltaTime );

		// note: _updateTime may disable the action resulting in
		// an effective weight of 0

		const weight = this._updateWeight( time );

		if ( weight > 0 ) {

			const interpolants = this._interpolants;
			const propertyMixers = this._propertyBindings;

			switch ( this.blendMode ) {

				case AdditiveAnimationBlendMode:

					for ( let j = 0, m = interpolants.length; j !== m; ++ j ) {

						interpolants[ j ].evaluate( clipTime );
						propertyMixers[ j ].accumulateAdditive( weight );

					}

					break;

				case NormalAnimationBlendMode:
				default:

					for ( let j = 0, m = interpolants.length; j !== m; ++ j ) {

						interpolants[ j ].evaluate( clipTime );
						propertyMixers[ j ].accumulate( accuIndex, weight );

					}

			}

		}

	}

	_updateWeight( time ) {

		let weight = 0;

		if ( this.enabled ) {

			weight = this.weight;
			const interpolant = this._weightInterpolant;

			if ( interpolant !== null ) {

				const interpolantValue = interpolant.evaluate( time )[ 0 ];

				weight *= interpolantValue;

				if ( time > interpolant.parameterPositions[ 1 ] ) {

					this.stopFading();

					if ( interpolantValue === 0 ) {

						// faded out, disable
						this.enabled = false;

					}

				}

			}

		}

		this._effectiveWeight = weight;
		return weight;

	}

	_updateTimeScale( time ) {

		let timeScale = 0;

		if ( ! this.paused ) {

			timeScale = this.timeScale;

			const interpolant = this._timeScaleInterpolant;

			if ( interpolant !== null ) {

				const interpolantValue = interpolant.evaluate( time )[ 0 ];

				timeScale *= interpolantValue;

				if ( time > interpolant.parameterPositions[ 1 ] ) {

					this.stopWarping();

					if ( timeScale === 0 ) {

						// motion has halted, pause
						this.paused = true;

					} else {

						// warp done - apply final time scale
						this.timeScale = timeScale;

					}

				}

			}

		}

		this._effectiveTimeScale = timeScale;
		return timeScale;

	}

	_updateTime( deltaTime ) {

		const duration = this._clip.duration;
		const loop = this.loop;

		let time = this.time + deltaTime;
		let loopCount = this._loopCount;

		const pingPong = ( loop === LoopPingPong );

		if ( deltaTime === 0 ) {

			if ( loopCount === - 1 ) return time;

			return ( pingPong && ( loopCount & 1 ) === 1 ) ? duration - time : time;

		}

		if ( loop === LoopOnce ) {

			if ( loopCount === - 1 ) {

				// just started

				this._loopCount = 0;
				this._setEndings( true, true, false );

			}

			handle_stop: {

				if ( time >= duration ) {

					time = duration;

				} else if ( time < 0 ) {

					time = 0;

				} else {

					this.time = time;

					break handle_stop;

				}

				if ( this.clampWhenFinished ) this.paused = true;
				else this.enabled = false;

				this.time = time;

				this._mixer.dispatchEvent( {
					type: 'finished', action: this,
					direction: deltaTime < 0 ? - 1 : 1
				} );

			}

		} else { // repetitive Repeat or PingPong

			if ( loopCount === - 1 ) {

				// just started

				if ( deltaTime >= 0 ) {

					loopCount = 0;

					this._setEndings( true, this.repetitions === 0, pingPong );

				} else {

					// when looping in reverse direction, the initial
					// transition through zero counts as a repetition,
					// so leave loopCount at -1

					this._setEndings( this.repetitions === 0, true, pingPong );

				}

			}

			if ( time >= duration || time < 0 ) {

				// wrap around

				const loopDelta = Math.floor( time / duration ); // signed
				time -= duration * loopDelta;

				loopCount += Math.abs( loopDelta );

				const pending = this.repetitions - loopCount;

				if ( pending <= 0 ) {

					// have to stop (switch state, clamp time, fire event)

					if ( this.clampWhenFinished ) this.paused = true;
					else this.enabled = false;

					time = deltaTime > 0 ? duration : 0;

					this.time = time;

					this._mixer.dispatchEvent( {
						type: 'finished', action: this,
						direction: deltaTime > 0 ? 1 : - 1
					} );

				} else {

					// keep running

					if ( pending === 1 ) {

						// entering the last round

						const atStart = deltaTime < 0;
						this._setEndings( atStart, ! atStart, pingPong );

					} else {

						this._setEndings( false, false, pingPong );

					}

					this._loopCount = loopCount;

					this.time = time;

					this._mixer.dispatchEvent( {
						type: 'loop', action: this, loopDelta: loopDelta
					} );

				}

			} else {

				this.time = time;

			}

			if ( pingPong && ( loopCount & 1 ) === 1 ) {

				// invert time for the "pong round"

				return duration - time;

			}

		}

		return time;

	}

	_setEndings( atStart, atEnd, pingPong ) {

		const settings = this._interpolantSettings;

		if ( pingPong ) {

			settings.endingStart = ZeroSlopeEnding;
			settings.endingEnd = ZeroSlopeEnding;

		} else {

			// assuming for LoopOnce atStart == atEnd == true

			if ( atStart ) {

				settings.endingStart = this.zeroSlopeAtStart ? ZeroSlopeEnding : ZeroCurvatureEnding;

			} else {

				settings.endingStart = WrapAroundEnding;

			}

			if ( atEnd ) {

				settings.endingEnd = this.zeroSlopeAtEnd ? ZeroSlopeEnding : ZeroCurvatureEnding;

			} else {

				settings.endingEnd 	 = WrapAroundEnding;

			}

		}

	}

	_scheduleFading( duration, weightNow, weightThen ) {

		const mixer = this._mixer, now = mixer.time;
		let interpolant = this._weightInterpolant;

		if ( interpolant === null ) {

			interpolant = mixer._lendControlInterpolant();
			this._weightInterpolant = interpolant;

		}

		const times = interpolant.parameterPositions,
			values = interpolant.sampleValues;

		times[ 0 ] = now;
		values[ 0 ] = weightNow;
		times[ 1 ] = now + duration;
		values[ 1 ] = weightThen;

		return this;

	}

}

const _controlInterpolantsResultBuffer = new Float32Array( 1 );


class AnimationMixer extends EventDispatcher {

	constructor( root ) {

		super();

		this._root = root;
		this._initMemoryManager();
		this._accuIndex = 0;
		this.time = 0;
		this.timeScale = 1.0;

	}

	_bindAction( action, prototypeAction ) {

		const root = action._localRoot || this._root,
			tracks = action._clip.tracks,
			nTracks = tracks.length,
			bindings = action._propertyBindings,
			interpolants = action._interpolants,
			rootUuid = root.uuid,
			bindingsByRoot = this._bindingsByRootAndName;

		let bindingsByName = bindingsByRoot[ rootUuid ];

		if ( bindingsByName === undefined ) {

			bindingsByName = {};
			bindingsByRoot[ rootUuid ] = bindingsByName;

		}

		for ( let i = 0; i !== nTracks; ++ i ) {

			const track = tracks[ i ],
				trackName = track.name;

			let binding = bindingsByName[ trackName ];

			if ( binding !== undefined ) {

				++ binding.referenceCount;
				bindings[ i ] = binding;

			} else {

				binding = bindings[ i ];

				if ( binding !== undefined ) {

					// existing binding, make sure the cache knows

					if ( binding._cacheIndex === null ) {

						++ binding.referenceCount;
						this._addInactiveBinding( binding, rootUuid, trackName );

					}

					continue;

				}

				const path = prototypeAction && prototypeAction.
					_propertyBindings[ i ].binding.parsedPath;

				binding = new PropertyMixer(
					PropertyBinding.create( root, trackName, path ),
					track.ValueTypeName, track.getValueSize() );

				++ binding.referenceCount;
				this._addInactiveBinding( binding, rootUuid, trackName );

				bindings[ i ] = binding;

			}

			interpolants[ i ].resultBuffer = binding.buffer;

		}

	}

	_activateAction( action ) {

		if ( ! this._isActiveAction( action ) ) {

			if ( action._cacheIndex === null ) {

				// this action has been forgotten by the cache, but the user
				// appears to be still using it -> rebind

				const rootUuid = ( action._localRoot || this._root ).uuid,
					clipUuid = action._clip.uuid,
					actionsForClip = this._actionsByClip[ clipUuid ];

				this._bindAction( action,
					actionsForClip && actionsForClip.knownActions[ 0 ] );

				this._addInactiveAction( action, clipUuid, rootUuid );

			}

			const bindings = action._propertyBindings;

			// increment reference counts / sort out state
			for ( let i = 0, n = bindings.length; i !== n; ++ i ) {

				const binding = bindings[ i ];

				if ( binding.useCount ++ === 0 ) {

					this._lendBinding( binding );
					binding.saveOriginalState();

				}

			}

			this._lendAction( action );

		}

	}

	_deactivateAction( action ) {

		if ( this._isActiveAction( action ) ) {

			const bindings = action._propertyBindings;

			// decrement reference counts / sort out state
			for ( let i = 0, n = bindings.length; i !== n; ++ i ) {

				const binding = bindings[ i ];

				if ( -- binding.useCount === 0 ) {

					binding.restoreOriginalState();
					this._takeBackBinding( binding );

				}

			}

			this._takeBackAction( action );

		}

	}

	// Memory manager

	_initMemoryManager() {

		this._actions = []; // 'nActiveActions' followed by inactive ones
		this._nActiveActions = 0;

		this._actionsByClip = {};
		// inside:
		// {
		// 	knownActions: Array< AnimationAction > - used as prototypes
		// 	actionByRoot: AnimationAction - lookup
		// }


		this._bindings = []; // 'nActiveBindings' followed by inactive ones
		this._nActiveBindings = 0;

		this._bindingsByRootAndName = {}; // inside: Map< name, PropertyMixer >


		this._controlInterpolants = []; // same game as above
		this._nActiveControlInterpolants = 0;

		const scope = this;

		this.stats = {

			actions: {
				get total() {

					return scope._actions.length;

				},
				get inUse() {

					return scope._nActiveActions;

				}
			},
			bindings: {
				get total() {

					return scope._bindings.length;

				},
				get inUse() {

					return scope._nActiveBindings;

				}
			},
			controlInterpolants: {
				get total() {

					return scope._controlInterpolants.length;

				},
				get inUse() {

					return scope._nActiveControlInterpolants;

				}
			}

		};

	}

	// Memory management for AnimationAction objects

	_isActiveAction( action ) {

		const index = action._cacheIndex;
		return index !== null && index < this._nActiveActions;

	}

	_addInactiveAction( action, clipUuid, rootUuid ) {

		const actions = this._actions,
			actionsByClip = this._actionsByClip;

		let actionsForClip = actionsByClip[ clipUuid ];

		if ( actionsForClip === undefined ) {

			actionsForClip = {

				knownActions: [ action ],
				actionByRoot: {}

			};

			action._byClipCacheIndex = 0;

			actionsByClip[ clipUuid ] = actionsForClip;

		} else {

			const knownActions = actionsForClip.knownActions;

			action._byClipCacheIndex = knownActions.length;
			knownActions.push( action );

		}

		action._cacheIndex = actions.length;
		actions.push( action );

		actionsForClip.actionByRoot[ rootUuid ] = action;

	}

	_removeInactiveAction( action ) {

		const actions = this._actions,
			lastInactiveAction = actions[ actions.length - 1 ],
			cacheIndex = action._cacheIndex;

		lastInactiveAction._cacheIndex = cacheIndex;
		actions[ cacheIndex ] = lastInactiveAction;
		actions.pop();

		action._cacheIndex = null;


		const clipUuid = action._clip.uuid,
			actionsByClip = this._actionsByClip,
			actionsForClip = actionsByClip[ clipUuid ],
			knownActionsForClip = actionsForClip.knownActions,

			lastKnownAction =
				knownActionsForClip[ knownActionsForClip.length - 1 ],

			byClipCacheIndex = action._byClipCacheIndex;

		lastKnownAction._byClipCacheIndex = byClipCacheIndex;
		knownActionsForClip[ byClipCacheIndex ] = lastKnownAction;
		knownActionsForClip.pop();

		action._byClipCacheIndex = null;


		const actionByRoot = actionsForClip.actionByRoot,
			rootUuid = ( action._localRoot || this._root ).uuid;

		delete actionByRoot[ rootUuid ];

		if ( knownActionsForClip.length === 0 ) {

			delete actionsByClip[ clipUuid ];

		}

		this._removeInactiveBindingsForAction( action );

	}

	_removeInactiveBindingsForAction( action ) {

		const bindings = action._propertyBindings;

		for ( let i = 0, n = bindings.length; i !== n; ++ i ) {

			const binding = bindings[ i ];

			if ( -- binding.referenceCount === 0 ) {

				this._removeInactiveBinding( binding );

			}

		}

	}

	_lendAction( action ) {

		// [ active actions |  inactive actions  ]
		// [  active actions >| inactive actions ]
		//                 s        a
		//                  <-swap->
		//                 a        s

		const actions = this._actions,
			prevIndex = action._cacheIndex,

			lastActiveIndex = this._nActiveActions ++,

			firstInactiveAction = actions[ lastActiveIndex ];

		action._cacheIndex = lastActiveIndex;
		actions[ lastActiveIndex ] = action;

		firstInactiveAction._cacheIndex = prevIndex;
		actions[ prevIndex ] = firstInactiveAction;

	}

	_takeBackAction( action ) {

		// [  active actions  | inactive actions ]
		// [ active actions |< inactive actions  ]
		//        a        s
		//         <-swap->
		//        s        a

		const actions = this._actions,
			prevIndex = action._cacheIndex,

			firstInactiveIndex = -- this._nActiveActions,

			lastActiveAction = actions[ firstInactiveIndex ];

		action._cacheIndex = firstInactiveIndex;
		actions[ firstInactiveIndex ] = action;

		lastActiveAction._cacheIndex = prevIndex;
		actions[ prevIndex ] = lastActiveAction;

	}

	// Memory management for PropertyMixer objects

	_addInactiveBinding( binding, rootUuid, trackName ) {

		const bindingsByRoot = this._bindingsByRootAndName,
			bindings = this._bindings;

		let bindingByName = bindingsByRoot[ rootUuid ];

		if ( bindingByName === undefined ) {

			bindingByName = {};
			bindingsByRoot[ rootUuid ] = bindingByName;

		}

		bindingByName[ trackName ] = binding;

		binding._cacheIndex = bindings.length;
		bindings.push( binding );

	}

	_removeInactiveBinding( binding ) {

		const bindings = this._bindings,
			propBinding = binding.binding,
			rootUuid = propBinding.rootNode.uuid,
			trackName = propBinding.path,
			bindingsByRoot = this._bindingsByRootAndName,
			bindingByName = bindingsByRoot[ rootUuid ],

			lastInactiveBinding = bindings[ bindings.length - 1 ],
			cacheIndex = binding._cacheIndex;

		lastInactiveBinding._cacheIndex = cacheIndex;
		bindings[ cacheIndex ] = lastInactiveBinding;
		bindings.pop();

		delete bindingByName[ trackName ];

		if ( Object.keys( bindingByName ).length === 0 ) {

			delete bindingsByRoot[ rootUuid ];

		}

	}

	_lendBinding( binding ) {

		const bindings = this._bindings,
			prevIndex = binding._cacheIndex,

			lastActiveIndex = this._nActiveBindings ++,

			firstInactiveBinding = bindings[ lastActiveIndex ];

		binding._cacheIndex = lastActiveIndex;
		bindings[ lastActiveIndex ] = binding;

		firstInactiveBinding._cacheIndex = prevIndex;
		bindings[ prevIndex ] = firstInactiveBinding;

	}

	_takeBackBinding( binding ) {

		const bindings = this._bindings,
			prevIndex = binding._cacheIndex,

			firstInactiveIndex = -- this._nActiveBindings,

			lastActiveBinding = bindings[ firstInactiveIndex ];

		binding._cacheIndex = firstInactiveIndex;
		bindings[ firstInactiveIndex ] = binding;

		lastActiveBinding._cacheIndex = prevIndex;
		bindings[ prevIndex ] = lastActiveBinding;

	}


	// Memory management of Interpolants for weight and time scale

	_lendControlInterpolant() {

		const interpolants = this._controlInterpolants,
			lastActiveIndex = this._nActiveControlInterpolants ++;

		let interpolant = interpolants[ lastActiveIndex ];

		if ( interpolant === undefined ) {

			interpolant = new LinearInterpolant(
				new Float32Array( 2 ), new Float32Array( 2 ),
				1, _controlInterpolantsResultBuffer );

			interpolant.__cacheIndex = lastActiveIndex;
			interpolants[ lastActiveIndex ] = interpolant;

		}

		return interpolant;

	}

	_takeBackControlInterpolant( interpolant ) {

		const interpolants = this._controlInterpolants,
			prevIndex = interpolant.__cacheIndex,

			firstInactiveIndex = -- this._nActiveControlInterpolants,

			lastActiveInterpolant = interpolants[ firstInactiveIndex ];

		interpolant.__cacheIndex = firstInactiveIndex;
		interpolants[ firstInactiveIndex ] = interpolant;

		lastActiveInterpolant.__cacheIndex = prevIndex;
		interpolants[ prevIndex ] = lastActiveInterpolant;

	}

	// return an action for a clip optionally using a custom root target
	// object (this method allocates a lot of dynamic memory in case a
	// previously unknown clip/root combination is specified)
	clipAction( clip, optionalRoot, blendMode ) {

		const root = optionalRoot || this._root,
			rootUuid = root.uuid;

		let clipObject = typeof clip === 'string' ? AnimationClip.findByName( root, clip ) : clip;

		const clipUuid = clipObject !== null ? clipObject.uuid : clip;

		const actionsForClip = this._actionsByClip[ clipUuid ];
		let prototypeAction = null;

		if ( blendMode === undefined ) {

			if ( clipObject !== null ) {

				blendMode = clipObject.blendMode;

			} else {

				blendMode = NormalAnimationBlendMode;

			}

		}

		if ( actionsForClip !== undefined ) {

			const existingAction = actionsForClip.actionByRoot[ rootUuid ];

			if ( existingAction !== undefined && existingAction.blendMode === blendMode ) {

				return existingAction;

			}

			// we know the clip, so we don't have to parse all
			// the bindings again but can just copy
			prototypeAction = actionsForClip.knownActions[ 0 ];

			// also, take the clip from the prototype action
			if ( clipObject === null )
				clipObject = prototypeAction._clip;

		}

		// clip must be known when specified via string
		if ( clipObject === null ) return null;

		// allocate all resources required to run it
		const newAction = new AnimationAction( this, clipObject, optionalRoot, blendMode );

		this._bindAction( newAction, prototypeAction );

		// and make the action known to the memory manager
		this._addInactiveAction( newAction, clipUuid, rootUuid );

		return newAction;

	}

	// get an existing action
	existingAction( clip, optionalRoot ) {

		const root = optionalRoot || this._root,
			rootUuid = root.uuid,

			clipObject = typeof clip === 'string' ?
				AnimationClip.findByName( root, clip ) : clip,

			clipUuid = clipObject ? clipObject.uuid : clip,

			actionsForClip = this._actionsByClip[ clipUuid ];

		if ( actionsForClip !== undefined ) {

			return actionsForClip.actionByRoot[ rootUuid ] || null;

		}

		return null;

	}

	// deactivates all previously scheduled actions
	stopAllAction() {

		const actions = this._actions,
			nActions = this._nActiveActions;

		for ( let i = nActions - 1; i >= 0; -- i ) {

			actions[ i ].stop();

		}

		return this;

	}

	// advance the time and update apply the animation
	update( deltaTime ) {

		deltaTime *= this.timeScale;

		const actions = this._actions,
			nActions = this._nActiveActions,

			time = this.time += deltaTime,
			timeDirection = Math.sign( deltaTime ),

			accuIndex = this._accuIndex ^= 1;

		// run active actions

		for ( let i = 0; i !== nActions; ++ i ) {

			const action = actions[ i ];

			action._update( time, deltaTime, timeDirection, accuIndex );

		}

		// update scene graph

		const bindings = this._bindings,
			nBindings = this._nActiveBindings;

		for ( let i = 0; i !== nBindings; ++ i ) {

			bindings[ i ].apply( accuIndex );

		}

		return this;

	}

	// Allows you to seek to a specific time in an animation.
	setTime( timeInSeconds ) {

		this.time = 0; // Zero out time attribute for AnimationMixer object;
		for ( let i = 0; i < this._actions.length; i ++ ) {

			this._actions[ i ].time = 0; // Zero out time attribute for all associated AnimationAction objects.

		}

		return this.update( timeInSeconds ); // Update used to set exact time. Returns "this" AnimationMixer object.

	}

	// return this mixer's root target object
	getRoot() {

		return this._root;

	}

	// free all resources specific to a particular clip
	uncacheClip( clip ) {

		const actions = this._actions,
			clipUuid = clip.uuid,
			actionsByClip = this._actionsByClip,
			actionsForClip = actionsByClip[ clipUuid ];

		if ( actionsForClip !== undefined ) {

			// note: just calling _removeInactiveAction would mess up the
			// iteration state and also require updating the state we can
			// just throw away

			const actionsToRemove = actionsForClip.knownActions;

			for ( let i = 0, n = actionsToRemove.length; i !== n; ++ i ) {

				const action = actionsToRemove[ i ];

				this._deactivateAction( action );

				const cacheIndex = action._cacheIndex,
					lastInactiveAction = actions[ actions.length - 1 ];

				action._cacheIndex = null;
				action._byClipCacheIndex = null;

				lastInactiveAction._cacheIndex = cacheIndex;
				actions[ cacheIndex ] = lastInactiveAction;
				actions.pop();

				this._removeInactiveBindingsForAction( action );

			}

			delete actionsByClip[ clipUuid ];

		}

	}

	// free all resources specific to a particular root target object
	uncacheRoot( root ) {

		const rootUuid = root.uuid,
			actionsByClip = this._actionsByClip;

		for ( const clipUuid in actionsByClip ) {

			const actionByRoot = actionsByClip[ clipUuid ].actionByRoot,
				action = actionByRoot[ rootUuid ];

			if ( action !== undefined ) {

				this._deactivateAction( action );
				this._removeInactiveAction( action );

			}

		}

		const bindingsByRoot = this._bindingsByRootAndName,
			bindingByName = bindingsByRoot[ rootUuid ];

		if ( bindingByName !== undefined ) {

			for ( const trackName in bindingByName ) {

				const binding = bindingByName[ trackName ];
				binding.restoreOriginalState();
				this._removeInactiveBinding( binding );

			}

		}

	}

	// remove a targeted clip from the cache
	uncacheAction( clip, optionalRoot ) {

		const action = this.existingAction( clip, optionalRoot );

		if ( action !== null ) {

			this._deactivateAction( action );
			this._removeInactiveAction( action );

		}

	}

}

let Uniform$1 = class Uniform {

	constructor( value ) {

		this.value = value;

	}

	clone() {

		return new Uniform( this.value.clone === undefined ? this.value : this.value.clone() );

	}

};

let _id$5 = 0;

let UniformsGroup$1 = class UniformsGroup extends EventDispatcher {

	constructor() {

		super();

		this.isUniformsGroup = true;

		Object.defineProperty( this, 'id', { value: _id$5 ++ } );

		this.name = '';

		this.usage = StaticDrawUsage;
		this.uniforms = [];

	}

	add( uniform ) {

		this.uniforms.push( uniform );

		return this;

	}

	remove( uniform ) {

		const index = this.uniforms.indexOf( uniform );

		if ( index !== - 1 ) this.uniforms.splice( index, 1 );

		return this;

	}

	setName( name ) {

		this.name = name;

		return this;

	}

	setUsage( value ) {

		this.usage = value;

		return this;

	}

	dispose() {

		this.dispatchEvent( { type: 'dispose' } );

		return this;

	}

	copy( source ) {

		this.name = source.name;
		this.usage = source.usage;

		const uniformsSource = source.uniforms;

		this.uniforms.length = 0;

		for ( let i = 0, l = uniformsSource.length; i < l; i ++ ) {

			const uniforms = Array.isArray( uniformsSource[ i ] ) ? uniformsSource[ i ] : [ uniformsSource[ i ] ];

			for ( let j = 0; j < uniforms.length; j ++ ) {

				this.uniforms.push( uniforms[ j ].clone() );

			}

		}

		return this;

	}

	clone() {

		return new this.constructor().copy( this );

	}

};

class InstancedInterleavedBuffer extends InterleavedBuffer {

	constructor( array, stride, meshPerAttribute = 1 ) {

		super( array, stride );

		this.isInstancedInterleavedBuffer = true;

		this.meshPerAttribute = meshPerAttribute;

	}

	copy( source ) {

		super.copy( source );

		this.meshPerAttribute = source.meshPerAttribute;

		return this;

	}

	clone( data ) {

		const ib = super.clone( data );

		ib.meshPerAttribute = this.meshPerAttribute;

		return ib;

	}

	toJSON( data ) {

		const json = super.toJSON( data );

		json.isInstancedInterleavedBuffer = true;
		json.meshPerAttribute = this.meshPerAttribute;

		return json;

	}

}

class GLBufferAttribute {

	constructor( buffer, type, itemSize, elementSize, count ) {

		this.isGLBufferAttribute = true;

		this.name = '';

		this.buffer = buffer;
		this.type = type;
		this.itemSize = itemSize;
		this.elementSize = elementSize;
		this.count = count;

		this.version = 0;

	}

	set needsUpdate( value ) {

		if ( value === true ) this.version ++;

	}

	setBuffer( buffer ) {

		this.buffer = buffer;

		return this;

	}

	setType( type, elementSize ) {

		this.type = type;
		this.elementSize = elementSize;

		return this;

	}

	setItemSize( itemSize ) {

		this.itemSize = itemSize;

		return this;

	}

	setCount( count ) {

		this.count = count;

		return this;

	}

}

const _matrix = /*@__PURE__*/ new Matrix4();

class Raycaster {

	constructor( origin, direction, near = 0, far = Infinity ) {

		this.ray = new Ray( origin, direction );
		// direction is assumed to be normalized (for accurate distance calculations)

		this.near = near;
		this.far = far;
		this.camera = null;
		this.layers = new Layers();

		this.params = {
			Mesh: {},
			Line: { threshold: 1 },
			LOD: {},
			Points: { threshold: 1 },
			Sprite: {}
		};

	}

	set( origin, direction ) {

		// direction is assumed to be normalized (for accurate distance calculations)

		this.ray.set( origin, direction );

	}

	setFromCamera( coords, camera ) {

		if ( camera.isPerspectiveCamera ) {

			this.ray.origin.setFromMatrixPosition( camera.matrixWorld );
			this.ray.direction.set( coords.x, coords.y, 0.5 ).unproject( camera ).sub( this.ray.origin ).normalize();
			this.camera = camera;

		} else if ( camera.isOrthographicCamera ) {

			this.ray.origin.set( coords.x, coords.y, ( camera.near + camera.far ) / ( camera.near - camera.far ) ).unproject( camera ); // set origin in plane of camera
			this.ray.direction.set( 0, 0, - 1 ).transformDirection( camera.matrixWorld );
			this.camera = camera;

		} else {

			console.error( 'THREE.Raycaster: Unsupported camera type: ' + camera.type );

		}

	}

	setFromXRController( controller ) {

		_matrix.identity().extractRotation( controller.matrixWorld );

		this.ray.origin.setFromMatrixPosition( controller.matrixWorld );
		this.ray.direction.set( 0, 0, - 1 ).applyMatrix4( _matrix );

		return this;

	}

	intersectObject( object, recursive = true, intersects = [] ) {

		intersect( object, this, intersects, recursive );

		intersects.sort( ascSort );

		return intersects;

	}

	intersectObjects( objects, recursive = true, intersects = [] ) {

		for ( let i = 0, l = objects.length; i < l; i ++ ) {

			intersect( objects[ i ], this, intersects, recursive );

		}

		intersects.sort( ascSort );

		return intersects;

	}

}

function ascSort( a, b ) {

	return a.distance - b.distance;

}

function intersect( object, raycaster, intersects, recursive ) {

	let propagate = true;

	if ( object.layers.test( raycaster.layers ) ) {

		const result = object.raycast( raycaster, intersects );

		if ( result === false ) propagate = false;

	}

	if ( propagate === true && recursive === true ) {

		const children = object.children;

		for ( let i = 0, l = children.length; i < l; i ++ ) {

			intersect( children[ i ], raycaster, intersects, true );

		}

	}

}

/**
 * Ref: https://en.wikipedia.org/wiki/Spherical_coordinate_system
 *
 * phi (the polar angle) is measured from the positive y-axis. The positive y-axis is up.
 * theta (the azimuthal angle) is measured from the positive z-axis.
 */
class Spherical {

	constructor( radius = 1, phi = 0, theta = 0 ) {

		this.radius = radius;
		this.phi = phi; // polar angle
		this.theta = theta; // azimuthal angle

		return this;

	}

	set( radius, phi, theta ) {

		this.radius = radius;
		this.phi = phi;
		this.theta = theta;

		return this;

	}

	copy( other ) {

		this.radius = other.radius;
		this.phi = other.phi;
		this.theta = other.theta;

		return this;

	}

	// restrict phi to be between EPS and PI-EPS
	makeSafe() {

		const EPS = 0.000001;
		this.phi = Math.max( EPS, Math.min( Math.PI - EPS, this.phi ) );

		return this;

	}

	setFromVector3( v ) {

		return this.setFromCartesianCoords( v.x, v.y, v.z );

	}

	setFromCartesianCoords( x, y, z ) {

		this.radius = Math.sqrt( x * x + y * y + z * z );

		if ( this.radius === 0 ) {

			this.theta = 0;
			this.phi = 0;

		} else {

			this.theta = Math.atan2( x, z );
			this.phi = Math.acos( clamp$1( y / this.radius, - 1, 1 ) );

		}

		return this;

	}

	clone() {

		return new this.constructor().copy( this );

	}

}

/**
 * Ref: https://en.wikipedia.org/wiki/Cylindrical_coordinate_system
 */

class Cylindrical {

	constructor( radius = 1, theta = 0, y = 0 ) {

		this.radius = radius; // distance from the origin to a point in the x-z plane
		this.theta = theta; // counterclockwise angle in the x-z plane measured in radians from the positive z-axis
		this.y = y; // height above the x-z plane

		return this;

	}

	set( radius, theta, y ) {

		this.radius = radius;
		this.theta = theta;
		this.y = y;

		return this;

	}

	copy( other ) {

		this.radius = other.radius;
		this.theta = other.theta;
		this.y = other.y;

		return this;

	}

	setFromVector3( v ) {

		return this.setFromCartesianCoords( v.x, v.y, v.z );

	}

	setFromCartesianCoords( x, y, z ) {

		this.radius = Math.sqrt( x * x + z * z );
		this.theta = Math.atan2( x, z );
		this.y = y;

		return this;

	}

	clone() {

		return new this.constructor().copy( this );

	}

}

const _vector$4 = /*@__PURE__*/ new Vector2();

class Box2 {

	constructor( min = new Vector2( + Infinity, + Infinity ), max = new Vector2( - Infinity, - Infinity ) ) {

		this.isBox2 = true;

		this.min = min;
		this.max = max;

	}

	set( min, max ) {

		this.min.copy( min );
		this.max.copy( max );

		return this;

	}

	setFromPoints( points ) {

		this.makeEmpty();

		for ( let i = 0, il = points.length; i < il; i ++ ) {

			this.expandByPoint( points[ i ] );

		}

		return this;

	}

	setFromCenterAndSize( center, size ) {

		const halfSize = _vector$4.copy( size ).multiplyScalar( 0.5 );
		this.min.copy( center ).sub( halfSize );
		this.max.copy( center ).add( halfSize );

		return this;

	}

	clone() {

		return new this.constructor().copy( this );

	}

	copy( box ) {

		this.min.copy( box.min );
		this.max.copy( box.max );

		return this;

	}

	makeEmpty() {

		this.min.x = this.min.y = + Infinity;
		this.max.x = this.max.y = - Infinity;

		return this;

	}

	isEmpty() {

		// this is a more robust check for empty than ( volume <= 0 ) because volume can get positive with two negative axes

		return ( this.max.x < this.min.x ) || ( this.max.y < this.min.y );

	}

	getCenter( target ) {

		return this.isEmpty() ? target.set( 0, 0 ) : target.addVectors( this.min, this.max ).multiplyScalar( 0.5 );

	}

	getSize( target ) {

		return this.isEmpty() ? target.set( 0, 0 ) : target.subVectors( this.max, this.min );

	}

	expandByPoint( point ) {

		this.min.min( point );
		this.max.max( point );

		return this;

	}

	expandByVector( vector ) {

		this.min.sub( vector );
		this.max.add( vector );

		return this;

	}

	expandByScalar( scalar ) {

		this.min.addScalar( - scalar );
		this.max.addScalar( scalar );

		return this;

	}

	containsPoint( point ) {

		return point.x < this.min.x || point.x > this.max.x ||
			point.y < this.min.y || point.y > this.max.y ? false : true;

	}

	containsBox( box ) {

		return this.min.x <= box.min.x && box.max.x <= this.max.x &&
			this.min.y <= box.min.y && box.max.y <= this.max.y;

	}

	getParameter( point, target ) {

		// This can potentially have a divide by zero if the box
		// has a size dimension of 0.

		return target.set(
			( point.x - this.min.x ) / ( this.max.x - this.min.x ),
			( point.y - this.min.y ) / ( this.max.y - this.min.y )
		);

	}

	intersectsBox( box ) {

		// using 4 splitting planes to rule out intersections

		return box.max.x < this.min.x || box.min.x > this.max.x ||
			box.max.y < this.min.y || box.min.y > this.max.y ? false : true;

	}

	clampPoint( point, target ) {

		return target.copy( point ).clamp( this.min, this.max );

	}

	distanceToPoint( point ) {

		return this.clampPoint( point, _vector$4 ).distanceTo( point );

	}

	intersect( box ) {

		this.min.max( box.min );
		this.max.min( box.max );

		if ( this.isEmpty() ) this.makeEmpty();

		return this;

	}

	union( box ) {

		this.min.min( box.min );
		this.max.max( box.max );

		return this;

	}

	translate( offset ) {

		this.min.add( offset );
		this.max.add( offset );

		return this;

	}

	equals( box ) {

		return box.min.equals( this.min ) && box.max.equals( this.max );

	}

}

const _startP = /*@__PURE__*/ new Vector3();
const _startEnd = /*@__PURE__*/ new Vector3();

class Line3 {

	constructor( start = new Vector3(), end = new Vector3() ) {

		this.start = start;
		this.end = end;

	}

	set( start, end ) {

		this.start.copy( start );
		this.end.copy( end );

		return this;

	}

	copy( line ) {

		this.start.copy( line.start );
		this.end.copy( line.end );

		return this;

	}

	getCenter( target ) {

		return target.addVectors( this.start, this.end ).multiplyScalar( 0.5 );

	}

	delta( target ) {

		return target.subVectors( this.end, this.start );

	}

	distanceSq() {

		return this.start.distanceToSquared( this.end );

	}

	distance() {

		return this.start.distanceTo( this.end );

	}

	at( t, target ) {

		return this.delta( target ).multiplyScalar( t ).add( this.start );

	}

	closestPointToPointParameter( point, clampToLine ) {

		_startP.subVectors( point, this.start );
		_startEnd.subVectors( this.end, this.start );

		const startEnd2 = _startEnd.dot( _startEnd );
		const startEnd_startP = _startEnd.dot( _startP );

		let t = startEnd_startP / startEnd2;

		if ( clampToLine ) {

			t = clamp$1( t, 0, 1 );

		}

		return t;

	}

	closestPointToPoint( point, clampToLine, target ) {

		const t = this.closestPointToPointParameter( point, clampToLine );

		return this.delta( target ).multiplyScalar( t ).add( this.start );

	}

	applyMatrix4( matrix ) {

		this.start.applyMatrix4( matrix );
		this.end.applyMatrix4( matrix );

		return this;

	}

	equals( line ) {

		return line.start.equals( this.start ) && line.end.equals( this.end );

	}

	clone() {

		return new this.constructor().copy( this );

	}

}

const _vector$3 = /*@__PURE__*/ new Vector3();

class SpotLightHelper extends Object3D {

	constructor( light, color ) {

		super();

		this.light = light;

		this.matrixAutoUpdate = false;

		this.color = color;

		this.type = 'SpotLightHelper';

		const geometry = new BufferGeometry();

		const positions = [
			0, 0, 0, 	0, 0, 1,
			0, 0, 0, 	1, 0, 1,
			0, 0, 0,	- 1, 0, 1,
			0, 0, 0, 	0, 1, 1,
			0, 0, 0, 	0, - 1, 1
		];

		for ( let i = 0, j = 1, l = 32; i < l; i ++, j ++ ) {

			const p1 = ( i / l ) * Math.PI * 2;
			const p2 = ( j / l ) * Math.PI * 2;

			positions.push(
				Math.cos( p1 ), Math.sin( p1 ), 1,
				Math.cos( p2 ), Math.sin( p2 ), 1
			);

		}

		geometry.setAttribute( 'position', new Float32BufferAttribute( positions, 3 ) );

		const material = new LineBasicMaterial( { fog: false, toneMapped: false } );

		this.cone = new LineSegments( geometry, material );
		this.add( this.cone );

		this.update();

	}

	dispose() {

		this.cone.geometry.dispose();
		this.cone.material.dispose();

	}

	update() {

		this.light.updateWorldMatrix( true, false );
		this.light.target.updateWorldMatrix( true, false );

		// update the local matrix based on the parent and light target transforms
		if ( this.parent ) {

			this.parent.updateWorldMatrix( true );

			this.matrix
				.copy( this.parent.matrixWorld )
				.invert()
				.multiply( this.light.matrixWorld );

		} else {

			this.matrix.copy( this.light.matrixWorld );

		}

		this.matrixWorld.copy( this.light.matrixWorld );

		const coneLength = this.light.distance ? this.light.distance : 1000;
		const coneWidth = coneLength * Math.tan( this.light.angle );

		this.cone.scale.set( coneWidth, coneWidth, coneLength );

		_vector$3.setFromMatrixPosition( this.light.target.matrixWorld );

		this.cone.lookAt( _vector$3 );

		if ( this.color !== undefined ) {

			this.cone.material.color.set( this.color );

		} else {

			this.cone.material.color.copy( this.light.color );

		}

	}

}

const _vector$2 = /*@__PURE__*/ new Vector3();
const _boneMatrix = /*@__PURE__*/ new Matrix4();
const _matrixWorldInv = /*@__PURE__*/ new Matrix4();


class SkeletonHelper extends LineSegments {

	constructor( object ) {

		const bones = getBoneList( object );

		const geometry = new BufferGeometry();

		const vertices = [];
		const colors = [];

		const color1 = new Color( 0, 0, 1 );
		const color2 = new Color( 0, 1, 0 );

		for ( let i = 0; i < bones.length; i ++ ) {

			const bone = bones[ i ];

			if ( bone.parent && bone.parent.isBone ) {

				vertices.push( 0, 0, 0 );
				vertices.push( 0, 0, 0 );
				colors.push( color1.r, color1.g, color1.b );
				colors.push( color2.r, color2.g, color2.b );

			}

		}

		geometry.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
		geometry.setAttribute( 'color', new Float32BufferAttribute( colors, 3 ) );

		const material = new LineBasicMaterial( { vertexColors: true, depthTest: false, depthWrite: false, toneMapped: false, transparent: true } );

		super( geometry, material );

		this.isSkeletonHelper = true;

		this.type = 'SkeletonHelper';

		this.root = object;
		this.bones = bones;

		this.matrix = object.matrixWorld;
		this.matrixAutoUpdate = false;

	}

	updateMatrixWorld( force ) {

		const bones = this.bones;

		const geometry = this.geometry;
		const position = geometry.getAttribute( 'position' );

		_matrixWorldInv.copy( this.root.matrixWorld ).invert();

		for ( let i = 0, j = 0; i < bones.length; i ++ ) {

			const bone = bones[ i ];

			if ( bone.parent && bone.parent.isBone ) {

				_boneMatrix.multiplyMatrices( _matrixWorldInv, bone.matrixWorld );
				_vector$2.setFromMatrixPosition( _boneMatrix );
				position.setXYZ( j, _vector$2.x, _vector$2.y, _vector$2.z );

				_boneMatrix.multiplyMatrices( _matrixWorldInv, bone.parent.matrixWorld );
				_vector$2.setFromMatrixPosition( _boneMatrix );
				position.setXYZ( j + 1, _vector$2.x, _vector$2.y, _vector$2.z );

				j += 2;

			}

		}

		geometry.getAttribute( 'position' ).needsUpdate = true;

		super.updateMatrixWorld( force );

	}

	dispose() {

		this.geometry.dispose();
		this.material.dispose();

	}

}


function getBoneList( object ) {

	const boneList = [];

	if ( object.isBone === true ) {

		boneList.push( object );

	}

	for ( let i = 0; i < object.children.length; i ++ ) {

		boneList.push.apply( boneList, getBoneList( object.children[ i ] ) );

	}

	return boneList;

}

class PointLightHelper extends Mesh {

	constructor( light, sphereSize, color ) {

		const geometry = new SphereGeometry( sphereSize, 4, 2 );
		const material = new MeshBasicMaterial( { wireframe: true, fog: false, toneMapped: false } );

		super( geometry, material );

		this.light = light;

		this.color = color;

		this.type = 'PointLightHelper';

		this.matrix = this.light.matrixWorld;
		this.matrixAutoUpdate = false;

		this.update();


		/*
	// TODO: delete this comment?
	const distanceGeometry = new THREE.IcosahedronGeometry( 1, 2 );
	const distanceMaterial = new THREE.MeshBasicMaterial( { color: hexColor, fog: false, wireframe: true, opacity: 0.1, transparent: true } );

	this.lightSphere = new THREE.Mesh( bulbGeometry, bulbMaterial );
	this.lightDistance = new THREE.Mesh( distanceGeometry, distanceMaterial );

	const d = light.distance;

	if ( d === 0.0 ) {

		this.lightDistance.visible = false;

	} else {

		this.lightDistance.scale.set( d, d, d );

	}

	this.add( this.lightDistance );
	*/

	}

	dispose() {

		this.geometry.dispose();
		this.material.dispose();

	}

	update() {

		this.light.updateWorldMatrix( true, false );

		if ( this.color !== undefined ) {

			this.material.color.set( this.color );

		} else {

			this.material.color.copy( this.light.color );

		}

		/*
		const d = this.light.distance;

		if ( d === 0.0 ) {

			this.lightDistance.visible = false;

		} else {

			this.lightDistance.visible = true;
			this.lightDistance.scale.set( d, d, d );

		}
		*/

	}

}

const _vector$1 = /*@__PURE__*/ new Vector3();
const _color1 = /*@__PURE__*/ new Color();
const _color2 = /*@__PURE__*/ new Color();

class HemisphereLightHelper extends Object3D {

	constructor( light, size, color ) {

		super();

		this.light = light;

		this.matrix = light.matrixWorld;
		this.matrixAutoUpdate = false;

		this.color = color;

		this.type = 'HemisphereLightHelper';

		const geometry = new OctahedronGeometry( size );
		geometry.rotateY( Math.PI * 0.5 );

		this.material = new MeshBasicMaterial( { wireframe: true, fog: false, toneMapped: false } );
		if ( this.color === undefined ) this.material.vertexColors = true;

		const position = geometry.getAttribute( 'position' );
		const colors = new Float32Array( position.count * 3 );

		geometry.setAttribute( 'color', new BufferAttribute( colors, 3 ) );

		this.add( new Mesh( geometry, this.material ) );

		this.update();

	}

	dispose() {

		this.children[ 0 ].geometry.dispose();
		this.children[ 0 ].material.dispose();

	}

	update() {

		const mesh = this.children[ 0 ];

		if ( this.color !== undefined ) {

			this.material.color.set( this.color );

		} else {

			const colors = mesh.geometry.getAttribute( 'color' );

			_color1.copy( this.light.color );
			_color2.copy( this.light.groundColor );

			for ( let i = 0, l = colors.count; i < l; i ++ ) {

				const color = ( i < ( l / 2 ) ) ? _color1 : _color2;

				colors.setXYZ( i, color.r, color.g, color.b );

			}

			colors.needsUpdate = true;

		}

		this.light.updateWorldMatrix( true, false );

		mesh.lookAt( _vector$1.setFromMatrixPosition( this.light.matrixWorld ).negate() );

	}

}

class GridHelper extends LineSegments {

	constructor( size = 10, divisions = 10, color1 = 0x444444, color2 = 0x888888 ) {

		color1 = new Color( color1 );
		color2 = new Color( color2 );

		const center = divisions / 2;
		const step = size / divisions;
		const halfSize = size / 2;

		const vertices = [], colors = [];

		for ( let i = 0, j = 0, k = - halfSize; i <= divisions; i ++, k += step ) {

			vertices.push( - halfSize, 0, k, halfSize, 0, k );
			vertices.push( k, 0, - halfSize, k, 0, halfSize );

			const color = i === center ? color1 : color2;

			color.toArray( colors, j ); j += 3;
			color.toArray( colors, j ); j += 3;
			color.toArray( colors, j ); j += 3;
			color.toArray( colors, j ); j += 3;

		}

		const geometry = new BufferGeometry();
		geometry.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
		geometry.setAttribute( 'color', new Float32BufferAttribute( colors, 3 ) );

		const material = new LineBasicMaterial( { vertexColors: true, toneMapped: false } );

		super( geometry, material );

		this.type = 'GridHelper';

	}

	dispose() {

		this.geometry.dispose();
		this.material.dispose();

	}

}

class PolarGridHelper extends LineSegments {

	constructor( radius = 10, sectors = 16, rings = 8, divisions = 64, color1 = 0x444444, color2 = 0x888888 ) {

		color1 = new Color( color1 );
		color2 = new Color( color2 );

		const vertices = [];
		const colors = [];

		// create the sectors

		if ( sectors > 1 ) {

			for ( let i = 0; i < sectors; i ++ ) {

				const v = ( i / sectors ) * ( Math.PI * 2 );

				const x = Math.sin( v ) * radius;
				const z = Math.cos( v ) * radius;

				vertices.push( 0, 0, 0 );
				vertices.push( x, 0, z );

				const color = ( i & 1 ) ? color1 : color2;

				colors.push( color.r, color.g, color.b );
				colors.push( color.r, color.g, color.b );

			}

		}

		// create the rings

		for ( let i = 0; i < rings; i ++ ) {

			const color = ( i & 1 ) ? color1 : color2;

			const r = radius - ( radius / rings * i );

			for ( let j = 0; j < divisions; j ++ ) {

				// first vertex

				let v = ( j / divisions ) * ( Math.PI * 2 );

				let x = Math.sin( v ) * r;
				let z = Math.cos( v ) * r;

				vertices.push( x, 0, z );
				colors.push( color.r, color.g, color.b );

				// second vertex

				v = ( ( j + 1 ) / divisions ) * ( Math.PI * 2 );

				x = Math.sin( v ) * r;
				z = Math.cos( v ) * r;

				vertices.push( x, 0, z );
				colors.push( color.r, color.g, color.b );

			}

		}

		const geometry = new BufferGeometry();
		geometry.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
		geometry.setAttribute( 'color', new Float32BufferAttribute( colors, 3 ) );

		const material = new LineBasicMaterial( { vertexColors: true, toneMapped: false } );

		super( geometry, material );

		this.type = 'PolarGridHelper';

	}

	dispose() {

		this.geometry.dispose();
		this.material.dispose();

	}

}

const _v1 = /*@__PURE__*/ new Vector3();
const _v2 = /*@__PURE__*/ new Vector3();
const _v3 = /*@__PURE__*/ new Vector3();

class DirectionalLightHelper extends Object3D {

	constructor( light, size, color ) {

		super();

		this.light = light;

		this.matrix = light.matrixWorld;
		this.matrixAutoUpdate = false;

		this.color = color;

		this.type = 'DirectionalLightHelper';

		if ( size === undefined ) size = 1;

		let geometry = new BufferGeometry();
		geometry.setAttribute( 'position', new Float32BufferAttribute( [
			- size, size, 0,
			size, size, 0,
			size, - size, 0,
			- size, - size, 0,
			- size, size, 0
		], 3 ) );

		const material = new LineBasicMaterial( { fog: false, toneMapped: false } );

		this.lightPlane = new Line( geometry, material );
		this.add( this.lightPlane );

		geometry = new BufferGeometry();
		geometry.setAttribute( 'position', new Float32BufferAttribute( [ 0, 0, 0, 0, 0, 1 ], 3 ) );

		this.targetLine = new Line( geometry, material );
		this.add( this.targetLine );

		this.update();

	}

	dispose() {

		this.lightPlane.geometry.dispose();
		this.lightPlane.material.dispose();
		this.targetLine.geometry.dispose();
		this.targetLine.material.dispose();

	}

	update() {

		this.light.updateWorldMatrix( true, false );
		this.light.target.updateWorldMatrix( true, false );

		_v1.setFromMatrixPosition( this.light.matrixWorld );
		_v2.setFromMatrixPosition( this.light.target.matrixWorld );
		_v3.subVectors( _v2, _v1 );

		this.lightPlane.lookAt( _v2 );

		if ( this.color !== undefined ) {

			this.lightPlane.material.color.set( this.color );
			this.targetLine.material.color.set( this.color );

		} else {

			this.lightPlane.material.color.copy( this.light.color );
			this.targetLine.material.color.copy( this.light.color );

		}

		this.targetLine.lookAt( _v2 );
		this.targetLine.scale.z = _v3.length();

	}

}

const _vector = /*@__PURE__*/ new Vector3();
const _camera$1 = /*@__PURE__*/ new Camera();

/**
 *	- shows frustum, line of sight and up of the camera
 *	- suitable for fast updates
 * 	- based on frustum visualization in lightgl.js shadowmap example
 *		https://github.com/evanw/lightgl.js/blob/master/tests/shadowmap.html
 */

class CameraHelper extends LineSegments {

	constructor( camera ) {

		const geometry = new BufferGeometry();
		const material = new LineBasicMaterial( { color: 0xffffff, vertexColors: true, toneMapped: false } );

		const vertices = [];
		const colors = [];

		const pointMap = {};

		// near

		addLine( 'n1', 'n2' );
		addLine( 'n2', 'n4' );
		addLine( 'n4', 'n3' );
		addLine( 'n3', 'n1' );

		// far

		addLine( 'f1', 'f2' );
		addLine( 'f2', 'f4' );
		addLine( 'f4', 'f3' );
		addLine( 'f3', 'f1' );

		// sides

		addLine( 'n1', 'f1' );
		addLine( 'n2', 'f2' );
		addLine( 'n3', 'f3' );
		addLine( 'n4', 'f4' );

		// cone

		addLine( 'p', 'n1' );
		addLine( 'p', 'n2' );
		addLine( 'p', 'n3' );
		addLine( 'p', 'n4' );

		// up

		addLine( 'u1', 'u2' );
		addLine( 'u2', 'u3' );
		addLine( 'u3', 'u1' );

		// target

		addLine( 'c', 't' );
		addLine( 'p', 'c' );

		// cross

		addLine( 'cn1', 'cn2' );
		addLine( 'cn3', 'cn4' );

		addLine( 'cf1', 'cf2' );
		addLine( 'cf3', 'cf4' );

		function addLine( a, b ) {

			addPoint( a );
			addPoint( b );

		}

		function addPoint( id ) {

			vertices.push( 0, 0, 0 );
			colors.push( 0, 0, 0 );

			if ( pointMap[ id ] === undefined ) {

				pointMap[ id ] = [];

			}

			pointMap[ id ].push( ( vertices.length / 3 ) - 1 );

		}

		geometry.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
		geometry.setAttribute( 'color', new Float32BufferAttribute( colors, 3 ) );

		super( geometry, material );

		this.type = 'CameraHelper';

		this.camera = camera;
		if ( this.camera.updateProjectionMatrix ) this.camera.updateProjectionMatrix();

		this.matrix = camera.matrixWorld;
		this.matrixAutoUpdate = false;

		this.pointMap = pointMap;

		this.update();

		// colors

		const colorFrustum = new Color( 0xffaa00 );
		const colorCone = new Color( 0xff0000 );
		const colorUp = new Color( 0x00aaff );
		const colorTarget = new Color( 0xffffff );
		const colorCross = new Color( 0x333333 );

		this.setColors( colorFrustum, colorCone, colorUp, colorTarget, colorCross );

	}

	setColors( frustum, cone, up, target, cross ) {

		const geometry = this.geometry;

		const colorAttribute = geometry.getAttribute( 'color' );

		// near

		colorAttribute.setXYZ( 0, frustum.r, frustum.g, frustum.b ); colorAttribute.setXYZ( 1, frustum.r, frustum.g, frustum.b ); // n1, n2
		colorAttribute.setXYZ( 2, frustum.r, frustum.g, frustum.b ); colorAttribute.setXYZ( 3, frustum.r, frustum.g, frustum.b ); // n2, n4
		colorAttribute.setXYZ( 4, frustum.r, frustum.g, frustum.b ); colorAttribute.setXYZ( 5, frustum.r, frustum.g, frustum.b ); // n4, n3
		colorAttribute.setXYZ( 6, frustum.r, frustum.g, frustum.b ); colorAttribute.setXYZ( 7, frustum.r, frustum.g, frustum.b ); // n3, n1

		// far

		colorAttribute.setXYZ( 8, frustum.r, frustum.g, frustum.b ); colorAttribute.setXYZ( 9, frustum.r, frustum.g, frustum.b ); // f1, f2
		colorAttribute.setXYZ( 10, frustum.r, frustum.g, frustum.b ); colorAttribute.setXYZ( 11, frustum.r, frustum.g, frustum.b ); // f2, f4
		colorAttribute.setXYZ( 12, frustum.r, frustum.g, frustum.b ); colorAttribute.setXYZ( 13, frustum.r, frustum.g, frustum.b ); // f4, f3
		colorAttribute.setXYZ( 14, frustum.r, frustum.g, frustum.b ); colorAttribute.setXYZ( 15, frustum.r, frustum.g, frustum.b ); // f3, f1

		// sides

		colorAttribute.setXYZ( 16, frustum.r, frustum.g, frustum.b ); colorAttribute.setXYZ( 17, frustum.r, frustum.g, frustum.b ); // n1, f1
		colorAttribute.setXYZ( 18, frustum.r, frustum.g, frustum.b ); colorAttribute.setXYZ( 19, frustum.r, frustum.g, frustum.b ); // n2, f2
		colorAttribute.setXYZ( 20, frustum.r, frustum.g, frustum.b ); colorAttribute.setXYZ( 21, frustum.r, frustum.g, frustum.b ); // n3, f3
		colorAttribute.setXYZ( 22, frustum.r, frustum.g, frustum.b ); colorAttribute.setXYZ( 23, frustum.r, frustum.g, frustum.b ); // n4, f4

		// cone

		colorAttribute.setXYZ( 24, cone.r, cone.g, cone.b ); colorAttribute.setXYZ( 25, cone.r, cone.g, cone.b ); // p, n1
		colorAttribute.setXYZ( 26, cone.r, cone.g, cone.b ); colorAttribute.setXYZ( 27, cone.r, cone.g, cone.b ); // p, n2
		colorAttribute.setXYZ( 28, cone.r, cone.g, cone.b ); colorAttribute.setXYZ( 29, cone.r, cone.g, cone.b ); // p, n3
		colorAttribute.setXYZ( 30, cone.r, cone.g, cone.b ); colorAttribute.setXYZ( 31, cone.r, cone.g, cone.b ); // p, n4

		// up

		colorAttribute.setXYZ( 32, up.r, up.g, up.b ); colorAttribute.setXYZ( 33, up.r, up.g, up.b ); // u1, u2
		colorAttribute.setXYZ( 34, up.r, up.g, up.b ); colorAttribute.setXYZ( 35, up.r, up.g, up.b ); // u2, u3
		colorAttribute.setXYZ( 36, up.r, up.g, up.b ); colorAttribute.setXYZ( 37, up.r, up.g, up.b ); // u3, u1

		// target

		colorAttribute.setXYZ( 38, target.r, target.g, target.b ); colorAttribute.setXYZ( 39, target.r, target.g, target.b ); // c, t
		colorAttribute.setXYZ( 40, cross.r, cross.g, cross.b ); colorAttribute.setXYZ( 41, cross.r, cross.g, cross.b ); // p, c

		// cross

		colorAttribute.setXYZ( 42, cross.r, cross.g, cross.b ); colorAttribute.setXYZ( 43, cross.r, cross.g, cross.b ); // cn1, cn2
		colorAttribute.setXYZ( 44, cross.r, cross.g, cross.b ); colorAttribute.setXYZ( 45, cross.r, cross.g, cross.b ); // cn3, cn4

		colorAttribute.setXYZ( 46, cross.r, cross.g, cross.b ); colorAttribute.setXYZ( 47, cross.r, cross.g, cross.b ); // cf1, cf2
		colorAttribute.setXYZ( 48, cross.r, cross.g, cross.b ); colorAttribute.setXYZ( 49, cross.r, cross.g, cross.b ); // cf3, cf4

		colorAttribute.needsUpdate = true;

	}

	update() {

		const geometry = this.geometry;
		const pointMap = this.pointMap;

		const w = 1, h = 1;

		// we need just camera projection matrix inverse
		// world matrix must be identity

		_camera$1.projectionMatrixInverse.copy( this.camera.projectionMatrixInverse );

		// center / target

		setPoint( 'c', pointMap, geometry, _camera$1, 0, 0, - 1 );
		setPoint( 't', pointMap, geometry, _camera$1, 0, 0, 1 );

		// near

		setPoint( 'n1', pointMap, geometry, _camera$1, - w, - h, - 1 );
		setPoint( 'n2', pointMap, geometry, _camera$1, w, - h, - 1 );
		setPoint( 'n3', pointMap, geometry, _camera$1, - w, h, - 1 );
		setPoint( 'n4', pointMap, geometry, _camera$1, w, h, - 1 );

		// far

		setPoint( 'f1', pointMap, geometry, _camera$1, - w, - h, 1 );
		setPoint( 'f2', pointMap, geometry, _camera$1, w, - h, 1 );
		setPoint( 'f3', pointMap, geometry, _camera$1, - w, h, 1 );
		setPoint( 'f4', pointMap, geometry, _camera$1, w, h, 1 );

		// up

		setPoint( 'u1', pointMap, geometry, _camera$1, w * 0.7, h * 1.1, - 1 );
		setPoint( 'u2', pointMap, geometry, _camera$1, - w * 0.7, h * 1.1, - 1 );
		setPoint( 'u3', pointMap, geometry, _camera$1, 0, h * 2, - 1 );

		// cross

		setPoint( 'cf1', pointMap, geometry, _camera$1, - w, 0, 1 );
		setPoint( 'cf2', pointMap, geometry, _camera$1, w, 0, 1 );
		setPoint( 'cf3', pointMap, geometry, _camera$1, 0, - h, 1 );
		setPoint( 'cf4', pointMap, geometry, _camera$1, 0, h, 1 );

		setPoint( 'cn1', pointMap, geometry, _camera$1, - w, 0, - 1 );
		setPoint( 'cn2', pointMap, geometry, _camera$1, w, 0, - 1 );
		setPoint( 'cn3', pointMap, geometry, _camera$1, 0, - h, - 1 );
		setPoint( 'cn4', pointMap, geometry, _camera$1, 0, h, - 1 );

		geometry.getAttribute( 'position' ).needsUpdate = true;

	}

	dispose() {

		this.geometry.dispose();
		this.material.dispose();

	}

}


function setPoint( point, pointMap, geometry, camera, x, y, z ) {

	_vector.set( x, y, z ).unproject( camera );

	const points = pointMap[ point ];

	if ( points !== undefined ) {

		const position = geometry.getAttribute( 'position' );

		for ( let i = 0, l = points.length; i < l; i ++ ) {

			position.setXYZ( points[ i ], _vector.x, _vector.y, _vector.z );

		}

	}

}

const _box = /*@__PURE__*/ new Box3();

class BoxHelper extends LineSegments {

	constructor( object, color = 0xffff00 ) {

		const indices = new Uint16Array( [ 0, 1, 1, 2, 2, 3, 3, 0, 4, 5, 5, 6, 6, 7, 7, 4, 0, 4, 1, 5, 2, 6, 3, 7 ] );
		const positions = new Float32Array( 8 * 3 );

		const geometry = new BufferGeometry();
		geometry.setIndex( new BufferAttribute( indices, 1 ) );
		geometry.setAttribute( 'position', new BufferAttribute( positions, 3 ) );

		super( geometry, new LineBasicMaterial( { color: color, toneMapped: false } ) );

		this.object = object;
		this.type = 'BoxHelper';

		this.matrixAutoUpdate = false;

		this.update();

	}

	update( object ) {

		if ( object !== undefined ) {

			console.warn( 'THREE.BoxHelper: .update() has no longer arguments.' );

		}

		if ( this.object !== undefined ) {

			_box.setFromObject( this.object );

		}

		if ( _box.isEmpty() ) return;

		const min = _box.min;
		const max = _box.max;

		/*
			5____4
		1/___0/|
		| 6__|_7
		2/___3/

		0: max.x, max.y, max.z
		1: min.x, max.y, max.z
		2: min.x, min.y, max.z
		3: max.x, min.y, max.z
		4: max.x, max.y, min.z
		5: min.x, max.y, min.z
		6: min.x, min.y, min.z
		7: max.x, min.y, min.z
		*/

		const position = this.geometry.attributes.position;
		const array = position.array;

		array[ 0 ] = max.x; array[ 1 ] = max.y; array[ 2 ] = max.z;
		array[ 3 ] = min.x; array[ 4 ] = max.y; array[ 5 ] = max.z;
		array[ 6 ] = min.x; array[ 7 ] = min.y; array[ 8 ] = max.z;
		array[ 9 ] = max.x; array[ 10 ] = min.y; array[ 11 ] = max.z;
		array[ 12 ] = max.x; array[ 13 ] = max.y; array[ 14 ] = min.z;
		array[ 15 ] = min.x; array[ 16 ] = max.y; array[ 17 ] = min.z;
		array[ 18 ] = min.x; array[ 19 ] = min.y; array[ 20 ] = min.z;
		array[ 21 ] = max.x; array[ 22 ] = min.y; array[ 23 ] = min.z;

		position.needsUpdate = true;

		this.geometry.computeBoundingSphere();

	}

	setFromObject( object ) {

		this.object = object;
		this.update();

		return this;

	}

	copy( source, recursive ) {

		super.copy( source, recursive );

		this.object = source.object;

		return this;

	}

	dispose() {

		this.geometry.dispose();
		this.material.dispose();

	}

}

class Box3Helper extends LineSegments {

	constructor( box, color = 0xffff00 ) {

		const indices = new Uint16Array( [ 0, 1, 1, 2, 2, 3, 3, 0, 4, 5, 5, 6, 6, 7, 7, 4, 0, 4, 1, 5, 2, 6, 3, 7 ] );

		const positions = [ 1, 1, 1, - 1, 1, 1, - 1, - 1, 1, 1, - 1, 1, 1, 1, - 1, - 1, 1, - 1, - 1, - 1, - 1, 1, - 1, - 1 ];

		const geometry = new BufferGeometry();

		geometry.setIndex( new BufferAttribute( indices, 1 ) );

		geometry.setAttribute( 'position', new Float32BufferAttribute( positions, 3 ) );

		super( geometry, new LineBasicMaterial( { color: color, toneMapped: false } ) );

		this.box = box;

		this.type = 'Box3Helper';

		this.geometry.computeBoundingSphere();

	}

	updateMatrixWorld( force ) {

		const box = this.box;

		if ( box.isEmpty() ) return;

		box.getCenter( this.position );

		box.getSize( this.scale );

		this.scale.multiplyScalar( 0.5 );

		super.updateMatrixWorld( force );

	}

	dispose() {

		this.geometry.dispose();
		this.material.dispose();

	}

}

class PlaneHelper extends Line {

	constructor( plane, size = 1, hex = 0xffff00 ) {

		const color = hex;

		const positions = [ 1, - 1, 0, - 1, 1, 0, - 1, - 1, 0, 1, 1, 0, - 1, 1, 0, - 1, - 1, 0, 1, - 1, 0, 1, 1, 0 ];

		const geometry = new BufferGeometry();
		geometry.setAttribute( 'position', new Float32BufferAttribute( positions, 3 ) );
		geometry.computeBoundingSphere();

		super( geometry, new LineBasicMaterial( { color: color, toneMapped: false } ) );

		this.type = 'PlaneHelper';

		this.plane = plane;

		this.size = size;

		const positions2 = [ 1, 1, 0, - 1, 1, 0, - 1, - 1, 0, 1, 1, 0, - 1, - 1, 0, 1, - 1, 0 ];

		const geometry2 = new BufferGeometry();
		geometry2.setAttribute( 'position', new Float32BufferAttribute( positions2, 3 ) );
		geometry2.computeBoundingSphere();

		this.add( new Mesh( geometry2, new MeshBasicMaterial( { color: color, opacity: 0.2, transparent: true, depthWrite: false, toneMapped: false } ) ) );

	}

	updateMatrixWorld( force ) {

		this.position.set( 0, 0, 0 );

		this.scale.set( 0.5 * this.size, 0.5 * this.size, 1 );

		this.lookAt( this.plane.normal );

		this.translateZ( - this.plane.constant );

		super.updateMatrixWorld( force );

	}

	dispose() {

		this.geometry.dispose();
		this.material.dispose();
		this.children[ 0 ].geometry.dispose();
		this.children[ 0 ].material.dispose();

	}

}

const _axis = /*@__PURE__*/ new Vector3();
let _lineGeometry, _coneGeometry;

class ArrowHelper extends Object3D {

	// dir is assumed to be normalized

	constructor( dir = new Vector3( 0, 0, 1 ), origin = new Vector3( 0, 0, 0 ), length = 1, color = 0xffff00, headLength = length * 0.2, headWidth = headLength * 0.2 ) {

		super();

		this.type = 'ArrowHelper';

		if ( _lineGeometry === undefined ) {

			_lineGeometry = new BufferGeometry();
			_lineGeometry.setAttribute( 'position', new Float32BufferAttribute( [ 0, 0, 0, 0, 1, 0 ], 3 ) );

			_coneGeometry = new CylinderGeometry( 0, 0.5, 1, 5, 1 );
			_coneGeometry.translate( 0, - 0.5, 0 );

		}

		this.position.copy( origin );

		this.line = new Line( _lineGeometry, new LineBasicMaterial( { color: color, toneMapped: false } ) );
		this.line.matrixAutoUpdate = false;
		this.add( this.line );

		this.cone = new Mesh( _coneGeometry, new MeshBasicMaterial( { color: color, toneMapped: false } ) );
		this.cone.matrixAutoUpdate = false;
		this.add( this.cone );

		this.setDirection( dir );
		this.setLength( length, headLength, headWidth );

	}

	setDirection( dir ) {

		// dir is assumed to be normalized

		if ( dir.y > 0.99999 ) {

			this.quaternion.set( 0, 0, 0, 1 );

		} else if ( dir.y < - 0.99999 ) {

			this.quaternion.set( 1, 0, 0, 0 );

		} else {

			_axis.set( dir.z, 0, - dir.x ).normalize();

			const radians = Math.acos( dir.y );

			this.quaternion.setFromAxisAngle( _axis, radians );

		}

	}

	setLength( length, headLength = length * 0.2, headWidth = headLength * 0.2 ) {

		this.line.scale.set( 1, Math.max( 0.0001, length - headLength ), 1 ); // see #17458
		this.line.updateMatrix();

		this.cone.scale.set( headWidth, headLength, headWidth );
		this.cone.position.y = length;
		this.cone.updateMatrix();

	}

	setColor( color ) {

		this.line.material.color.set( color );
		this.cone.material.color.set( color );

	}

	copy( source ) {

		super.copy( source, false );

		this.line.copy( source.line );
		this.cone.copy( source.cone );

		return this;

	}

	dispose() {

		this.line.geometry.dispose();
		this.line.material.dispose();
		this.cone.geometry.dispose();
		this.cone.material.dispose();

	}

}

class AxesHelper extends LineSegments {

	constructor( size = 1 ) {

		const vertices = [
			0, 0, 0,	size, 0, 0,
			0, 0, 0,	0, size, 0,
			0, 0, 0,	0, 0, size
		];

		const colors = [
			1, 0, 0,	1, 0.6, 0,
			0, 1, 0,	0.6, 1, 0,
			0, 0, 1,	0, 0.6, 1
		];

		const geometry = new BufferGeometry();
		geometry.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
		geometry.setAttribute( 'color', new Float32BufferAttribute( colors, 3 ) );

		const material = new LineBasicMaterial( { vertexColors: true, toneMapped: false } );

		super( geometry, material );

		this.type = 'AxesHelper';

	}

	setColors( xAxisColor, yAxisColor, zAxisColor ) {

		const color = new Color();
		const array = this.geometry.attributes.color.array;

		color.set( xAxisColor );
		color.toArray( array, 0 );
		color.toArray( array, 3 );

		color.set( yAxisColor );
		color.toArray( array, 6 );
		color.toArray( array, 9 );

		color.set( zAxisColor );
		color.toArray( array, 12 );
		color.toArray( array, 15 );

		this.geometry.attributes.color.needsUpdate = true;

		return this;

	}

	dispose() {

		this.geometry.dispose();
		this.material.dispose();

	}

}

class ShapePath {

	constructor() {

		this.type = 'ShapePath';

		this.color = new Color();

		this.subPaths = [];
		this.currentPath = null;

	}

	moveTo( x, y ) {

		this.currentPath = new Path();
		this.subPaths.push( this.currentPath );
		this.currentPath.moveTo( x, y );

		return this;

	}

	lineTo( x, y ) {

		this.currentPath.lineTo( x, y );

		return this;

	}

	quadraticCurveTo( aCPx, aCPy, aX, aY ) {

		this.currentPath.quadraticCurveTo( aCPx, aCPy, aX, aY );

		return this;

	}

	bezierCurveTo( aCP1x, aCP1y, aCP2x, aCP2y, aX, aY ) {

		this.currentPath.bezierCurveTo( aCP1x, aCP1y, aCP2x, aCP2y, aX, aY );

		return this;

	}

	splineThru( pts ) {

		this.currentPath.splineThru( pts );

		return this;

	}

	toShapes( isCCW ) {

		function toShapesNoHoles( inSubpaths ) {

			const shapes = [];

			for ( let i = 0, l = inSubpaths.length; i < l; i ++ ) {

				const tmpPath = inSubpaths[ i ];

				const tmpShape = new Shape();
				tmpShape.curves = tmpPath.curves;

				shapes.push( tmpShape );

			}

			return shapes;

		}

		function isPointInsidePolygon( inPt, inPolygon ) {

			const polyLen = inPolygon.length;

			// inPt on polygon contour => immediate success    or
			// toggling of inside/outside at every single! intersection point of an edge
			//  with the horizontal line through inPt, left of inPt
			//  not counting lowerY endpoints of edges and whole edges on that line
			let inside = false;
			for ( let p = polyLen - 1, q = 0; q < polyLen; p = q ++ ) {

				let edgeLowPt = inPolygon[ p ];
				let edgeHighPt = inPolygon[ q ];

				let edgeDx = edgeHighPt.x - edgeLowPt.x;
				let edgeDy = edgeHighPt.y - edgeLowPt.y;

				if ( Math.abs( edgeDy ) > Number.EPSILON ) {

					// not parallel
					if ( edgeDy < 0 ) {

						edgeLowPt = inPolygon[ q ]; edgeDx = - edgeDx;
						edgeHighPt = inPolygon[ p ]; edgeDy = - edgeDy;

					}

					if ( ( inPt.y < edgeLowPt.y ) || ( inPt.y > edgeHighPt.y ) ) 		continue;

					if ( inPt.y === edgeLowPt.y ) {

						if ( inPt.x === edgeLowPt.x )		return	true;		// inPt is on contour ?
						// continue;				// no intersection or edgeLowPt => doesn't count !!!

					} else {

						const perpEdge = edgeDy * ( inPt.x - edgeLowPt.x ) - edgeDx * ( inPt.y - edgeLowPt.y );
						if ( perpEdge === 0 )				return	true;		// inPt is on contour ?
						if ( perpEdge < 0 ) 				continue;
						inside = ! inside;		// true intersection left of inPt

					}

				} else {

					// parallel or collinear
					if ( inPt.y !== edgeLowPt.y ) 		continue;			// parallel
					// edge lies on the same horizontal line as inPt
					if ( ( ( edgeHighPt.x <= inPt.x ) && ( inPt.x <= edgeLowPt.x ) ) ||
						 ( ( edgeLowPt.x <= inPt.x ) && ( inPt.x <= edgeHighPt.x ) ) )		return	true;	// inPt: Point on contour !
					// continue;

				}

			}

			return	inside;

		}

		const isClockWise = ShapeUtils.isClockWise;

		const subPaths = this.subPaths;
		if ( subPaths.length === 0 ) return [];

		let solid, tmpPath, tmpShape;
		const shapes = [];

		if ( subPaths.length === 1 ) {

			tmpPath = subPaths[ 0 ];
			tmpShape = new Shape();
			tmpShape.curves = tmpPath.curves;
			shapes.push( tmpShape );
			return shapes;

		}

		let holesFirst = ! isClockWise( subPaths[ 0 ].getPoints() );
		holesFirst = isCCW ? ! holesFirst : holesFirst;

		// console.log("Holes first", holesFirst);

		const betterShapeHoles = [];
		const newShapes = [];
		let newShapeHoles = [];
		let mainIdx = 0;
		let tmpPoints;

		newShapes[ mainIdx ] = undefined;
		newShapeHoles[ mainIdx ] = [];

		for ( let i = 0, l = subPaths.length; i < l; i ++ ) {

			tmpPath = subPaths[ i ];
			tmpPoints = tmpPath.getPoints();
			solid = isClockWise( tmpPoints );
			solid = isCCW ? ! solid : solid;

			if ( solid ) {

				if ( ( ! holesFirst ) && ( newShapes[ mainIdx ] ) )	mainIdx ++;

				newShapes[ mainIdx ] = { s: new Shape(), p: tmpPoints };
				newShapes[ mainIdx ].s.curves = tmpPath.curves;

				if ( holesFirst )	mainIdx ++;
				newShapeHoles[ mainIdx ] = [];

				//console.log('cw', i);

			} else {

				newShapeHoles[ mainIdx ].push( { h: tmpPath, p: tmpPoints[ 0 ] } );

				//console.log('ccw', i);

			}

		}

		// only Holes? -> probably all Shapes with wrong orientation
		if ( ! newShapes[ 0 ] )	return	toShapesNoHoles( subPaths );


		if ( newShapes.length > 1 ) {

			let ambiguous = false;
			let toChange = 0;

			for ( let sIdx = 0, sLen = newShapes.length; sIdx < sLen; sIdx ++ ) {

				betterShapeHoles[ sIdx ] = [];

			}

			for ( let sIdx = 0, sLen = newShapes.length; sIdx < sLen; sIdx ++ ) {

				const sho = newShapeHoles[ sIdx ];

				for ( let hIdx = 0; hIdx < sho.length; hIdx ++ ) {

					const ho = sho[ hIdx ];
					let hole_unassigned = true;

					for ( let s2Idx = 0; s2Idx < newShapes.length; s2Idx ++ ) {

						if ( isPointInsidePolygon( ho.p, newShapes[ s2Idx ].p ) ) {

							if ( sIdx !== s2Idx )	toChange ++;

							if ( hole_unassigned ) {

								hole_unassigned = false;
								betterShapeHoles[ s2Idx ].push( ho );

							} else {

								ambiguous = true;

							}

						}

					}

					if ( hole_unassigned ) {

						betterShapeHoles[ sIdx ].push( ho );

					}

				}

			}

			if ( toChange > 0 && ambiguous === false ) {

				newShapeHoles = betterShapeHoles;

			}

		}

		let tmpHoles;

		for ( let i = 0, il = newShapes.length; i < il; i ++ ) {

			tmpShape = newShapes[ i ].s;
			shapes.push( tmpShape );
			tmpHoles = newShapeHoles[ i ];

			for ( let j = 0, jl = tmpHoles.length; j < jl; j ++ ) {

				tmpShape.holes.push( tmpHoles[ j ].h );

			}

		}

		//console.log("shape", shapes);

		return shapes;

	}

}

class WebGLMultipleRenderTargets extends WebGLRenderTarget { // @deprecated, r162

	constructor( width = 1, height = 1, count = 1, options = {} ) {

		console.warn( 'THREE.WebGLMultipleRenderTargets has been deprecated and will be removed in r172. Use THREE.WebGLRenderTarget and set the "count" parameter to enable MRT.' );

		super( width, height, { ...options, count } );

		this.isWebGLMultipleRenderTargets = true;

	}

	get texture() {

		return this.textures;

	}

}

if ( self.GPUShaderStage === undefined ) {

	self.GPUShaderStage = { VERTEX: 1, FRAGMENT: 2, COMPUTE: 4 };

}

// statics

let isAvailable = navigator.gpu !== undefined;


if ( typeof window !== 'undefined' && isAvailable ) {

	isAvailable = await navigator.gpu.requestAdapter();

}

class WebGPU {

	static isAvailable() {

		return Boolean( isAvailable );

	}

	static getStaticAdapter() {

		return isAvailable;

	}

	static getErrorMessage() {

		const message = 'Your browser does not support <a href="https://gpuweb.github.io/gpuweb/" style="color:blue">WebGPU</a> yet';

		const element = document.createElement( 'div' );
		element.id = 'webgpumessage';
		element.style.fontFamily = 'monospace';
		element.style.fontSize = '13px';
		element.style.fontWeight = 'normal';
		element.style.textAlign = 'center';
		element.style.background = '#fff';
		element.style.color = '#000';
		element.style.padding = '1.5em';
		element.style.maxWidth = '400px';
		element.style.margin = '5em auto 0';

		element.innerHTML = message;

		return element;

	}

}

class Animation {

	constructor( nodes, info ) {

		this.nodes = nodes;
		this.info = info;

		this.animationLoop = null;
		this.requestId = null;

		this._init();

	}

	_init() {

		const update = ( time, frame ) => {

			this.requestId = self.requestAnimationFrame( update );

			if ( this.info.autoReset === true ) this.info.reset();

			this.nodes.nodeFrame.update();

			this.info.frame = this.nodes.nodeFrame.frameId;

			if ( this.animationLoop !== null ) this.animationLoop( time, frame );

		};

		update();

	}

	dispose() {

		self.cancelAnimationFrame( this.requestId );
		this.requestId = null;

	}

	setAnimationLoop( callback ) {

		this.animationLoop = callback;

	}

}

class ChainMap {

	constructor() {

		this.weakMap = new WeakMap();

	}

	get( keys ) {

		let map = this.weakMap;

		for ( let i = 0; i < keys.length; i ++ ) {

			map = map.get( keys[ i ] );

			if ( map === undefined ) return undefined;

		}

		return map.get( keys[ keys.length - 1 ] );

	}

	set( keys, value ) {

		let map = this.weakMap;

		for ( let i = 0; i < keys.length; i ++ ) {

			const key = keys[ i ];

			if ( map.has( key ) === false ) map.set( key, new WeakMap() );

			map = map.get( key );

		}

		return map.set( keys[ keys.length - 1 ], value );

	}

	delete( keys ) {

		let map = this.weakMap;

		for ( let i = 0; i < keys.length; i ++ ) {

			map = map.get( keys[ i ] );

			if ( map === undefined ) return false;

		}

		return map.delete( keys[ keys.length - 1 ] );

	}

}

const _plane = new Plane();

let _clippingContextVersion = 0;

class ClippingContext {

	constructor() {

		this.version = ++ _clippingContextVersion;

		this.globalClippingCount = 0;

		this.localClippingCount = 0;
		this.localClippingEnabled = false;
		this.localClipIntersection = false;

		this.planes = [];

		this.parentVersion = 0;
		this.viewNormalMatrix = new Matrix3();

	}

	projectPlanes( source, offset ) {

		const l = source.length;
		const planes = this.planes;

		for ( let i = 0; i < l; i ++ ) {

			_plane.copy( source[ i ] ).applyMatrix4( this.viewMatrix, this.viewNormalMatrix );

			const v = planes[ offset + i ];
			const normal = _plane.normal;

			v.x = - normal.x;
			v.y = - normal.y;
			v.z = - normal.z;
			v.w = _plane.constant;

		}

	}

	updateGlobal( renderer, camera ) {

		const rendererClippingPlanes = renderer.clippingPlanes;
		this.viewMatrix = camera.matrixWorldInverse;

		this.viewNormalMatrix.getNormalMatrix( this.viewMatrix );

		let update = false;

		if ( Array.isArray( rendererClippingPlanes ) && rendererClippingPlanes.length !== 0 ) {

			const l = rendererClippingPlanes.length;

			if ( l !== this.globalClippingCount ) {

				const planes = [];

				for ( let i = 0; i < l; i ++ ) {

					planes.push( new Vector4() );

				}

				this.globalClippingCount = l;
				this.planes = planes;

				update = true;

			}

			this.projectPlanes( rendererClippingPlanes, 0 );

		} else if ( this.globalClippingCount !== 0 ) {

			this.globalClippingCount = 0;
			this.planes = [];
			update = true;

		}

		if ( renderer.localClippingEnabled !== this.localClippingEnabled ) {

			this.localClippingEnabled = renderer.localClippingEnabled;
			update = true;

		}

		if ( update ) this.version = _clippingContextVersion ++;

	}

	update( parent, material ) {

		let update = false;

		if ( this !== parent && parent.version !== this.parentVersion ) {

			this.globalClippingCount = material.isShadowNodeMaterial ? 0 : parent.globalClippingCount;
			this.localClippingEnabled = parent.localClippingEnabled;
			this.planes = Array.from( parent.planes );
			this.parentVersion = parent.version;
			this.viewMatrix = parent.viewMatrix;
			this.viewNormalMatrix = parent.viewNormalMatrix;

			update = true;

		}

		if ( this.localClippingEnabled ) {

			const localClippingPlanes = material.clippingPlanes;

			if ( ( Array.isArray( localClippingPlanes ) && localClippingPlanes.length !== 0 ) ) {

				const l = localClippingPlanes.length;
				const planes = this.planes;
				const offset = this.globalClippingCount;

				if ( update || l !== this.localClippingCount ) {

					planes.length = offset + l;

					for ( let i = 0; i < l; i ++ ) {

						planes[ offset + i ] = new Vector4();

					}

					this.localClippingCount = l;
					update = true;

				}

				this.projectPlanes( localClippingPlanes, offset );


			} else if ( this.localClippingCount !== 0 ) {

				this.localClippingCount = 0;
				update = true;

			}

			if ( this.localClipIntersection !== material.clipIntersection ) {

				this.localClipIntersection = material.clipIntersection;
				update = true;

			}

		}

		if ( update ) this.version = _clippingContextVersion ++;

	}

}

let id$4 = 0;

function getKeys( obj ) {

	const keys = Object.keys( obj );

	let proto = Object.getPrototypeOf( obj );

	while ( proto ) {

		const descriptors = Object.getOwnPropertyDescriptors( proto );

		for ( const key in descriptors ) {

			if ( descriptors[ key ] !== undefined ) {

				const descriptor = descriptors[ key ];

				if ( descriptor && typeof descriptor.get === 'function' ) {

					keys.push( key );

				}

			}

		}

		proto = Object.getPrototypeOf( proto );

	}

	return keys;

}

class RenderObject {

	constructor( nodes, geometries, renderer, object, material, scene, camera, lightsNode, renderContext ) {

		this._nodes = nodes;
		this._geometries = geometries;

		this.id = id$4 ++;

		this.renderer = renderer;
		this.object = object;
		this.material = material;
		this.scene = scene;
		this.camera = camera;
		this.lightsNode = lightsNode;
		this.context = renderContext;

		this.geometry = object.geometry;
		this.version = material.version;

		this.drawRange = null;

		this.attributes = null;
		this.pipeline = null;
		this.vertexBuffers = null;

		this.updateClipping( renderContext.clippingContext );

		this.clippingContextVersion = this.clippingContext.version;

		this.initialNodesCacheKey = this.getNodesCacheKey();
		this.initialCacheKey = this.getCacheKey();

		this._nodeBuilderState = null;
		this._bindings = null;

		this.onDispose = null;

		this.isRenderObject = true;

		this.onMaterialDispose = () => {

			this.dispose();

		};

		this.material.addEventListener( 'dispose', this.onMaterialDispose );

	}

	updateClipping( parent ) {

		const material = this.material;

		let clippingContext = this.clippingContext;

		if ( Array.isArray( material.clippingPlanes ) ) {

			if ( clippingContext === parent || ! clippingContext ) {

				clippingContext = new ClippingContext();
				this.clippingContext = clippingContext;

			}

			clippingContext.update( parent, material );

		} else if ( this.clippingContext !== parent ) {

			this.clippingContext = parent;

		}

	}

	get clippingNeedsUpdate() {

		if ( this.clippingContext.version === this.clippingContextVersion ) return false;

		this.clippingContextVersion = this.clippingContext.version;

		return true;

	}

	getNodeBuilderState() {

		return this._nodeBuilderState || ( this._nodeBuilderState = this._nodes.getForRender( this ) );

	}

	getBindings() {

		return this._bindings || ( this._bindings = this.getNodeBuilderState().createBindings() );

	}

	getIndex() {

		return this._geometries.getIndex( this );

	}

	getChainArray() {

		return [ this.object, this.material, this.context, this.lightsNode ];

	}

	getAttributes() {

		if ( this.attributes !== null ) return this.attributes;

		const nodeAttributes = this.getNodeBuilderState().nodeAttributes;
		const geometry = this.geometry;

		const attributes = [];
		const vertexBuffers = new Set();

		for ( const nodeAttribute of nodeAttributes ) {

			const attribute = nodeAttribute.node && nodeAttribute.node.attribute ? nodeAttribute.node.attribute : geometry.getAttribute( nodeAttribute.name );

			if ( attribute === undefined ) continue;

			attributes.push( attribute );

			const bufferAttribute = attribute.isInterleavedBufferAttribute ? attribute.data : attribute;
			vertexBuffers.add( bufferAttribute );

		}

		this.attributes = attributes;
		this.vertexBuffers = Array.from( vertexBuffers.values() );

		return attributes;

	}

	getVertexBuffers() {

		if ( this.vertexBuffers === null ) this.getAttributes();

		return this.vertexBuffers;

	}

	getMaterialCacheKey() {

		const { object, material } = this;

		let cacheKey = material.customProgramCacheKey();

		for ( const property of getKeys( material ) ) {

			if ( /^(is[A-Z]|_)|^(visible|version|uuid|name|opacity|userData)$/.test( property ) ) continue;

			let value = material[ property ];

			if ( value !== null ) {

				const type = typeof value;

				if ( type === 'number' ) value = value !== 0 ? '1' : '0'; // Convert to on/off, important for clearcoat, transmission, etc
				else if ( type === 'object' ) value = '{}';

			}

			cacheKey += /*property + ':' +*/ value + ',';

		}

		cacheKey += this.clippingContextVersion + ',';

		if ( object.skeleton ) {

			cacheKey += object.skeleton.bones.length + ',';

		}

		if ( object.morphTargetInfluences ) {

			cacheKey += object.morphTargetInfluences.length + ',';

		}

		if ( object.isBatchedMesh ) {

			cacheKey += object._matricesTexture.uuid + ',';

			if ( object._colorsTexture !== null ) {

				cacheKey += object._colorsTexture.uuid + ',';

			}

		}

		if ( object.count > 1 ) {

			cacheKey += object.count + ',';

		}

		return cacheKey;

	}

	get needsUpdate() {

		return this.initialNodesCacheKey !== this.getNodesCacheKey() || this.clippingNeedsUpdate;

	}

	getNodesCacheKey() {

		// Environment Nodes Cache Key

		return this._nodes.getCacheKey( this.scene, this.lightsNode );

	}

	getCacheKey() {

		return this.getMaterialCacheKey() + ',' + this.getNodesCacheKey();

	}

	dispose() {

		this.material.removeEventListener( 'dispose', this.onMaterialDispose );

		this.onDispose();

	}

}

class RenderObjects {

	constructor( renderer, nodes, geometries, pipelines, bindings, info ) {

		this.renderer = renderer;
		this.nodes = nodes;
		this.geometries = geometries;
		this.pipelines = pipelines;
		this.bindings = bindings;
		this.info = info;

		this.chainMaps = {};

	}

	get( object, material, scene, camera, lightsNode, renderContext, passId ) {

		const chainMap = this.getChainMap( passId );
		const chainArray = [ object, material, renderContext, lightsNode ];

		let renderObject = chainMap.get( chainArray );

		if ( renderObject === undefined ) {

			renderObject = this.createRenderObject( this.nodes, this.geometries, this.renderer, object, material, scene, camera, lightsNode, renderContext, passId );

			chainMap.set( chainArray, renderObject );

		} else {

			renderObject.updateClipping( renderContext.clippingContext );

			if ( renderObject.version !== material.version || renderObject.needsUpdate ) {

				if ( renderObject.initialCacheKey !== renderObject.getCacheKey() ) {

					renderObject.dispose();

					renderObject = this.get( object, material, scene, camera, lightsNode, renderContext, passId );

				} else {

					renderObject.version = material.version;

				}

			}

		}

		return renderObject;

	}

	getChainMap( passId = 'default' ) {

		return this.chainMaps[ passId ] || ( this.chainMaps[ passId ] = new ChainMap() );

	}

	dispose() {

		this.chainMaps = {};

	}

	createRenderObject( nodes, geometries, renderer, object, material, scene, camera, lightsNode, renderContext, passId ) {

		const chainMap = this.getChainMap( passId );

		const renderObject = new RenderObject( nodes, geometries, renderer, object, material, scene, camera, lightsNode, renderContext );

		renderObject.onDispose = () => {

			this.pipelines.delete( renderObject );
			this.bindings.delete( renderObject );
			this.nodes.delete( renderObject );

			chainMap.delete( renderObject.getChainArray() );

		};

		return renderObject;

	}


}

class DataMap {

	constructor() {

		this.data = new WeakMap();

	}

	get( object ) {

		let map = this.data.get( object );

		if ( map === undefined ) {

			map = {};
			this.data.set( object, map );

		}

		return map;

	}

	delete( object ) {

		let map;

		if ( this.data.has( object ) ) {

			map = this.data.get( object );

			this.data.delete( object );

		}

		return map;

	}

	has( object ) {

		return this.data.has( object );

	}

	dispose() {

		this.data = new WeakMap();

	}

}

const AttributeType = {
	VERTEX: 1,
	INDEX: 2,
	STORAGE: 4
};

// size of a chunk in bytes (STD140 layout)

const GPU_CHUNK_BYTES = 16;

// @TODO: Move to src/constants.js

const BlendColorFactor = 211;
const OneMinusBlendColorFactor = 212;

class Attributes extends DataMap {

	constructor( backend ) {

		super();

		this.backend = backend;

	}

	delete( attribute ) {

		const attributeData = super.delete( attribute );

		if ( attributeData !== undefined ) {

			this.backend.destroyAttribute( attribute );

		}

		return attributeData;

	}

	update( attribute, type ) {

		const data = this.get( attribute );

		if ( data.version === undefined ) {

			if ( type === AttributeType.VERTEX ) {

				this.backend.createAttribute( attribute );

			} else if ( type === AttributeType.INDEX ) {

				this.backend.createIndexAttribute( attribute );

			} else if ( type === AttributeType.STORAGE ) {

				this.backend.createStorageAttribute( attribute );

			}

			data.version = this._getBufferAttribute( attribute ).version;

		} else {

			const bufferAttribute = this._getBufferAttribute( attribute );

			if ( data.version < bufferAttribute.version || bufferAttribute.usage === DynamicDrawUsage ) {

				this.backend.updateAttribute( attribute );

				data.version = bufferAttribute.version;

			}

		}

	}

	_getBufferAttribute( attribute ) {

		if ( attribute.isInterleavedBufferAttribute ) attribute = attribute.data;

		return attribute;

	}

}

function arrayNeedsUint32( array ) {

	// assumes larger values usually on last

	for ( let i = array.length - 1; i >= 0; -- i ) {

		if ( array[ i ] >= 65535 ) return true; // account for PRIMITIVE_RESTART_FIXED_INDEX, #24565

	}

	return false;

}

function getWireframeVersion( geometry ) {

	return ( geometry.index !== null ) ? geometry.index.version : geometry.attributes.position.version;

}

function getWireframeIndex( geometry ) {

	const indices = [];

	const geometryIndex = geometry.index;
	const geometryPosition = geometry.attributes.position;

	if ( geometryIndex !== null ) {

		const array = geometryIndex.array;

		for ( let i = 0, l = array.length; i < l; i += 3 ) {

			const a = array[ i + 0 ];
			const b = array[ i + 1 ];
			const c = array[ i + 2 ];

			indices.push( a, b, b, c, c, a );

		}

	} else {

		const array = geometryPosition.array;

		for ( let i = 0, l = ( array.length / 3 ) - 1; i < l; i += 3 ) {

			const a = i + 0;
			const b = i + 1;
			const c = i + 2;

			indices.push( a, b, b, c, c, a );

		}

	}

	const attribute = new ( arrayNeedsUint32( indices ) ? Uint32BufferAttribute : Uint16BufferAttribute )( indices, 1 );
	attribute.version = getWireframeVersion( geometry );

	return attribute;

}

class Geometries extends DataMap {

	constructor( attributes, info ) {

		super();

		this.attributes = attributes;
		this.info = info;

		this.wireframes = new WeakMap();

		this.attributeCall = new WeakMap();

	}

	has( renderObject ) {

		const geometry = renderObject.geometry;

		return super.has( geometry ) && this.get( geometry ).initialized === true;

	}

	updateForRender( renderObject ) {

		if ( this.has( renderObject ) === false ) this.initGeometry( renderObject );

		this.updateAttributes( renderObject );

	}

	initGeometry( renderObject ) {

		const geometry = renderObject.geometry;
		const geometryData = this.get( geometry );

		geometryData.initialized = true;

		this.info.memory.geometries ++;

		const onDispose = () => {

			this.info.memory.geometries --;

			const index = geometry.index;
			const geometryAttributes = renderObject.getAttributes();

			if ( index !== null ) {

				this.attributes.delete( index );

			}

			for ( const geometryAttribute of geometryAttributes ) {

				this.attributes.delete( geometryAttribute );

			}

			const wireframeAttribute = this.wireframes.get( geometry );

			if ( wireframeAttribute !== undefined ) {

				this.attributes.delete( wireframeAttribute );

			}

			geometry.removeEventListener( 'dispose', onDispose );

		};

		geometry.addEventListener( 'dispose', onDispose );

	}

	updateAttributes( renderObject ) {

		const attributes = renderObject.getAttributes();

		for ( const attribute of attributes ) {

			if ( attribute.isStorageBufferAttribute || attribute.isStorageInstancedBufferAttribute ) {

				this.updateAttribute( attribute, AttributeType.STORAGE );

			} else {

				this.updateAttribute( attribute, AttributeType.VERTEX );

			}

		}

		const index = this.getIndex( renderObject );

		if ( index !== null ) {

			this.updateAttribute( index, AttributeType.INDEX );

		}

	}

	updateAttribute( attribute, type ) {

		const callId = this.info.render.calls;

		if ( ! attribute.isInterleavedBufferAttribute ) {

			if ( this.attributeCall.get( attribute ) !== callId ) {

				this.attributes.update( attribute, type );

				this.attributeCall.set( attribute, callId );

			}

		} else {

			if ( this.attributeCall.get( attribute ) === undefined ) {

				this.attributes.update( attribute, type );

				this.attributeCall.set( attribute, callId );

			} else if ( this.attributeCall.get( attribute.data ) !== callId ) {

				this.attributes.update( attribute, type );

				this.attributeCall.set( attribute.data, callId );

				this.attributeCall.set( attribute, callId );

			}

		}

	}

	getIndex( renderObject ) {

		const { geometry, material } = renderObject;

		let index = geometry.index;

		if ( material.wireframe === true ) {

			const wireframes = this.wireframes;

			let wireframeAttribute = wireframes.get( geometry );

			if ( wireframeAttribute === undefined ) {

				wireframeAttribute = getWireframeIndex( geometry );

				wireframes.set( geometry, wireframeAttribute );

			} else if ( wireframeAttribute.version !== getWireframeVersion( geometry ) ) {

				this.attributes.delete( wireframeAttribute );

				wireframeAttribute = getWireframeIndex( geometry );

				wireframes.set( geometry, wireframeAttribute );

			}

			index = wireframeAttribute;

		}

		return index;

	}

}

class Info {

	constructor() {

		this.autoReset = true;

		this.frame = 0;
		this.calls = 0;

		this.render = {
			calls: 0,
			frameCalls: 0,
			drawCalls: 0,
			triangles: 0,
			points: 0,
			lines: 0,
			timestamp: 0,
			previousFrameCalls: 0,
			timestampCalls: 0
		};

		this.compute = {
			calls: 0,
			frameCalls: 0,
			timestamp: 0,
			previousFrameCalls: 0,
			timestampCalls: 0
		};

		this.memory = {
			geometries: 0,
			textures: 0
		};

	}

	update( object, count, instanceCount ) {

		this.render.drawCalls ++;

		if ( object.isMesh || object.isSprite ) {

			this.render.triangles += instanceCount * ( count / 3 );

		} else if ( object.isPoints ) {

			this.render.points += instanceCount * count;

		} else if ( object.isLineSegments ) {

			this.render.lines += instanceCount * ( count / 2 );

		} else if ( object.isLine ) {

			this.render.lines += instanceCount * ( count - 1 );

		} else {

			console.error( 'THREE.WebGPUInfo: Unknown object type.' );

		}

	}

	updateTimestamp( type, time ) {

		if ( this[ type ].timestampCalls === 0 ) {

			this[ type ].timestamp = 0;

		}


		this[ type ].timestamp += time;

		this[ type ].timestampCalls ++;


		if ( this[ type ].timestampCalls >= this[ type ].previousFrameCalls ) {

			this[ type ].timestampCalls = 0;

		}


	}

	reset() {

		const previousRenderFrameCalls = this.render.frameCalls;
		this.render.previousFrameCalls = previousRenderFrameCalls;

		const previousComputeFrameCalls = this.compute.frameCalls;
		this.compute.previousFrameCalls = previousComputeFrameCalls;


		this.render.drawCalls = 0;
		this.render.frameCalls = 0;
		this.compute.frameCalls = 0;

		this.render.triangles = 0;
		this.render.points = 0;
		this.render.lines = 0;


	}

	dispose() {

		this.reset();

		this.calls = 0;

		this.render.calls = 0;
		this.compute.calls = 0;

		this.render.timestamp = 0;
		this.compute.timestamp = 0;
		this.memory.geometries = 0;
		this.memory.textures = 0;

	}

}

class Pipeline {

	constructor( cacheKey ) {

		this.cacheKey = cacheKey;

		this.usedTimes = 0;

	}

}

class RenderPipeline extends Pipeline {

	constructor( cacheKey, vertexProgram, fragmentProgram ) {

		super( cacheKey );

		this.vertexProgram = vertexProgram;
		this.fragmentProgram = fragmentProgram;

	}

}

class ComputePipeline extends Pipeline {

	constructor( cacheKey, computeProgram ) {

		super( cacheKey );

		this.computeProgram = computeProgram;

		this.isComputePipeline = true;

	}

}

let _id$4 = 0;

class ProgrammableStage {

	constructor( code, type, transforms = null, attributes = null ) {

		this.id = _id$4 ++;

		this.code = code;
		this.stage = type;
		this.transforms = transforms;
		this.attributes = attributes;

		this.usedTimes = 0;

	}

}

class Pipelines extends DataMap {

	constructor( backend, nodes ) {

		super();

		this.backend = backend;
		this.nodes = nodes;

		this.bindings = null; // set by the bindings

		this.caches = new Map();
		this.programs = {
			vertex: new Map(),
			fragment: new Map(),
			compute: new Map()
		};

	}

	getForCompute( computeNode, bindings ) {

		const { backend } = this;

		const data = this.get( computeNode );

		if ( this._needsComputeUpdate( computeNode ) ) {

			const previousPipeline = data.pipeline;

			if ( previousPipeline ) {

				previousPipeline.usedTimes --;
				previousPipeline.computeProgram.usedTimes --;

			}

			// get shader

			const nodeBuilderState = this.nodes.getForCompute( computeNode );

			// programmable stage

			let stageCompute = this.programs.compute.get( nodeBuilderState.computeShader );

			if ( stageCompute === undefined ) {

				if ( previousPipeline && previousPipeline.computeProgram.usedTimes === 0 ) this._releaseProgram( previousPipeline.computeProgram );

				stageCompute = new ProgrammableStage( nodeBuilderState.computeShader, 'compute', nodeBuilderState.transforms, nodeBuilderState.nodeAttributes );
				this.programs.compute.set( nodeBuilderState.computeShader, stageCompute );

				backend.createProgram( stageCompute );

			}

			// determine compute pipeline

			const cacheKey = this._getComputeCacheKey( computeNode, stageCompute );

			let pipeline = this.caches.get( cacheKey );

			if ( pipeline === undefined ) {

				if ( previousPipeline && previousPipeline.usedTimes === 0 ) this._releasePipeline( previousPipeline );

				pipeline = this._getComputePipeline( computeNode, stageCompute, cacheKey, bindings );

			}

			// keep track of all used times

			pipeline.usedTimes ++;
			stageCompute.usedTimes ++;

			//

			data.version = computeNode.version;
			data.pipeline = pipeline;

		}

		return data.pipeline;

	}

	getForRender( renderObject, promises = null ) {

		const { backend } = this;

		const data = this.get( renderObject );

		if ( this._needsRenderUpdate( renderObject ) ) {

			const previousPipeline = data.pipeline;

			if ( previousPipeline ) {

				previousPipeline.usedTimes --;
				previousPipeline.vertexProgram.usedTimes --;
				previousPipeline.fragmentProgram.usedTimes --;

			}

			// get shader

			const nodeBuilderState = renderObject.getNodeBuilderState();

			// programmable stages

			let stageVertex = this.programs.vertex.get( nodeBuilderState.vertexShader );

			if ( stageVertex === undefined ) {

				if ( previousPipeline && previousPipeline.vertexProgram.usedTimes === 0 ) this._releaseProgram( previousPipeline.vertexProgram );

				stageVertex = new ProgrammableStage( nodeBuilderState.vertexShader, 'vertex' );
				this.programs.vertex.set( nodeBuilderState.vertexShader, stageVertex );

				backend.createProgram( stageVertex );

			}

			let stageFragment = this.programs.fragment.get( nodeBuilderState.fragmentShader );

			if ( stageFragment === undefined ) {

				if ( previousPipeline && previousPipeline.fragmentProgram.usedTimes === 0 ) this._releaseProgram( previousPipeline.fragmentProgram );

				stageFragment = new ProgrammableStage( nodeBuilderState.fragmentShader, 'fragment' );
				this.programs.fragment.set( nodeBuilderState.fragmentShader, stageFragment );

				backend.createProgram( stageFragment );

			}

			// determine render pipeline

			const cacheKey = this._getRenderCacheKey( renderObject, stageVertex, stageFragment );

			let pipeline = this.caches.get( cacheKey );

			if ( pipeline === undefined ) {

				if ( previousPipeline && previousPipeline.usedTimes === 0 ) this._releasePipeline( previousPipeline );

				pipeline = this._getRenderPipeline( renderObject, stageVertex, stageFragment, cacheKey, promises );

			} else {

				renderObject.pipeline = pipeline;

			}

			// keep track of all used times

			pipeline.usedTimes ++;
			stageVertex.usedTimes ++;
			stageFragment.usedTimes ++;

			//

			data.pipeline = pipeline;

		}

		return data.pipeline;

	}

	delete( object ) {

		const pipeline = this.get( object ).pipeline;

		if ( pipeline ) {

			// pipeline

			pipeline.usedTimes --;

			if ( pipeline.usedTimes === 0 ) this._releasePipeline( pipeline );

			// programs

			if ( pipeline.isComputePipeline ) {

				pipeline.computeProgram.usedTimes --;

				if ( pipeline.computeProgram.usedTimes === 0 ) this._releaseProgram( pipeline.computeProgram );

			} else {

				pipeline.fragmentProgram.usedTimes --;
				pipeline.vertexProgram.usedTimes --;

				if ( pipeline.vertexProgram.usedTimes === 0 ) this._releaseProgram( pipeline.vertexProgram );
				if ( pipeline.fragmentProgram.usedTimes === 0 ) this._releaseProgram( pipeline.fragmentProgram );

			}

		}

		return super.delete( object );

	}

	dispose() {

		super.dispose();

		this.caches = new Map();
		this.programs = {
			vertex: new Map(),
			fragment: new Map(),
			compute: new Map()
		};

	}

	updateForRender( renderObject ) {

		this.getForRender( renderObject );

	}

	_getComputePipeline( computeNode, stageCompute, cacheKey, bindings ) {

		// check for existing pipeline

		cacheKey = cacheKey || this._getComputeCacheKey( computeNode, stageCompute );

		let pipeline = this.caches.get( cacheKey );

		if ( pipeline === undefined ) {

			pipeline = new ComputePipeline( cacheKey, stageCompute );

			this.caches.set( cacheKey, pipeline );

			this.backend.createComputePipeline( pipeline, bindings );

		}

		return pipeline;

	}

	_getRenderPipeline( renderObject, stageVertex, stageFragment, cacheKey, promises ) {

		// check for existing pipeline

		cacheKey = cacheKey || this._getRenderCacheKey( renderObject, stageVertex, stageFragment );

		let pipeline = this.caches.get( cacheKey );

		if ( pipeline === undefined ) {

			pipeline = new RenderPipeline( cacheKey, stageVertex, stageFragment );

			this.caches.set( cacheKey, pipeline );

			renderObject.pipeline = pipeline;

			this.backend.createRenderPipeline( renderObject, promises );

		}

		return pipeline;

	}

	_getComputeCacheKey( computeNode, stageCompute ) {

		return computeNode.id + ',' + stageCompute.id;

	}

	_getRenderCacheKey( renderObject, stageVertex, stageFragment ) {

		return stageVertex.id + ',' + stageFragment.id + ',' + this.backend.getRenderCacheKey( renderObject );

	}

	_releasePipeline( pipeline ) {

		this.caches.delete( pipeline.cacheKey );

	}

	_releaseProgram( program ) {

		const code = program.code;
		const stage = program.stage;

		this.programs[ stage ].delete( code );

	}

	_needsComputeUpdate( computeNode ) {

		const data = this.get( computeNode );

		return data.pipeline === undefined || data.version !== computeNode.version;

	}

	_needsRenderUpdate( renderObject ) {

		const data = this.get( renderObject );

		return data.pipeline === undefined || this.backend.needsRenderUpdate( renderObject );

	}

}

class Bindings extends DataMap {

	constructor( backend, nodes, textures, attributes, pipelines, info ) {

		super();

		this.backend = backend;
		this.textures = textures;
		this.pipelines = pipelines;
		this.attributes = attributes;
		this.nodes = nodes;
		this.info = info;

		this.pipelines.bindings = this; // assign bindings to pipelines

	}

	getForRender( renderObject ) {

		const bindings = renderObject.getBindings();

		for ( const bindGroup of bindings ) {

			const groupData = this.get( bindGroup );

			if ( groupData.bindGroup === undefined ) {

				// each object defines an array of bindings (ubos, textures, samplers etc.)

				this._init( bindGroup );

				this.backend.createBindings( bindGroup, bindings );

				groupData.bindGroup = bindGroup;

			}

		}

		return bindings;

	}

	getForCompute( computeNode ) {

		const bindings = this.nodes.getForCompute( computeNode ).bindings;

		for ( const bindGroup of bindings ) {

			const groupData = this.get( bindGroup );

			if ( groupData.bindGroup === undefined ) {

				this._init( bindGroup );

				this.backend.createBindings( bindGroup, bindings );

				groupData.bindGroup = bindGroup;

			}

		}

		return bindings;

	}

	updateForCompute( computeNode ) {

		this._updateBindings( computeNode, this.getForCompute( computeNode ) );

	}

	updateForRender( renderObject ) {

		this._updateBindings( renderObject, this.getForRender( renderObject ) );

	}

	_updateBindings( object, bindings ) {

		for ( const bindGroup of bindings ) {

			this._update( object, bindGroup, bindings );

		}

	}

	_init( bindGroup ) {

		for ( const binding of bindGroup.bindings ) {

			if ( binding.isSampledTexture ) {

				this.textures.updateTexture( binding.texture );

			} else if ( binding.isStorageBuffer ) {

				const attribute = binding.attribute;

				this.attributes.update( attribute, AttributeType.STORAGE );

			}

		}

	}

	_update( object, bindGroup, bindings ) {

		const { backend } = this;

		let needsBindingsUpdate = false;

		// iterate over all bindings and check if buffer updates or a new binding group is required

		for ( const binding of bindGroup.bindings ) {

			if ( binding.isNodeUniformsGroup ) {

				const updated = this.nodes.updateGroup( binding );

				if ( ! updated ) continue;

			}

			if ( binding.isUniformBuffer ) {

				const updated = binding.update();

				if ( updated ) {

					backend.updateBinding( binding );

				}

			} else if ( binding.isSampler ) {

				binding.update();

			} else if ( binding.isSampledTexture ) {

				const texture = binding.texture;

				if ( binding.needsBindingsUpdate ) needsBindingsUpdate = true;

				const updated = binding.update();

				if ( updated ) {

					this.textures.updateTexture( binding.texture );

				}

				const textureData = backend.get( binding.texture );

				if ( backend.isWebGPUBackend === true && textureData.texture === undefined && textureData.externalTexture === undefined ) {

					// TODO: Remove this once we found why updated === false isn't bound to a texture in the WebGPU backend
					console.error( 'Bindings._update: binding should be available:', binding, updated, binding.texture, binding.textureNode.value );

					this.textures.updateTexture( binding.texture );
					needsBindingsUpdate = true;

				}

				if ( texture.isStorageTexture === true ) {

					const textureData = this.get( texture );

					if ( binding.store === true ) {

						textureData.needsMipmap = true;

					} else if ( texture.generateMipmaps === true && this.textures.needsMipmaps( texture ) && textureData.needsMipmap === true ) {

						this.backend.generateMipmaps( texture );

						textureData.needsMipmap = false;

					}

				}

			}

		}

		if ( needsBindingsUpdate === true ) {

			const pipeline = this.pipelines.getForRender( object );

			this.backend.updateBindings( bindGroup, bindings, pipeline );

		}

	}

}

const NodeShaderStage = {
	VERTEX: 'vertex',
	FRAGMENT: 'fragment'
};

const NodeUpdateType = {
	NONE: 'none',
	FRAME: 'frame',
	RENDER: 'render',
	OBJECT: 'object'
};

const NodeType = {
	BOOLEAN: 'bool',
	INTEGER: 'int',
	FLOAT: 'float',
	VECTOR2: 'vec2',
	VECTOR3: 'vec3',
	VECTOR4: 'vec4',
	MATRIX2: 'mat2',
	MATRIX3: 'mat3',
	MATRIX4: 'mat4'
};

const defaultShaderStages = [ 'fragment', 'vertex' ];
const defaultBuildStages = [ 'setup', 'analyze', 'generate' ];
const shaderStages = [ ...defaultShaderStages, 'compute' ];
const vectorComponents = [ 'x', 'y', 'z', 'w' ];

function getCacheKey( object, force = false ) {

	let cacheKey = '{';

	if ( object.isNode === true ) {

		cacheKey += object.id;

	}

	for ( const { property, childNode } of getNodeChildren( object ) ) {

		cacheKey += ',' + property.slice( 0, - 4 ) + ':' + childNode.getCacheKey( force );

	}

	cacheKey += '}';

	return cacheKey;

}

function* getNodeChildren( node, toJSON = false ) {

	for ( const property in node ) {

		// Ignore private properties.
		if ( property.startsWith( '_' ) === true ) continue;

		const object = node[ property ];

		if ( Array.isArray( object ) === true ) {

			for ( let i = 0; i < object.length; i ++ ) {

				const child = object[ i ];

				if ( child && ( child.isNode === true || toJSON && typeof child.toJSON === 'function' ) ) {

					yield { property, index: i, childNode: child };

				}

			}

		} else if ( object && object.isNode === true ) {

			yield { property, childNode: object };

		} else if ( typeof object === 'object' ) {

			for ( const subProperty in object ) {

				const child = object[ subProperty ];

				if ( child && ( child.isNode === true || toJSON && typeof child.toJSON === 'function' ) ) {

					yield { property, index: subProperty, childNode: child };

				}

			}

		}

	}

}

function getValueType( value ) {

	if ( value === undefined || value === null ) return null;

	const typeOf = typeof value;

	if ( value.isNode === true ) {

		return 'node';

	} else if ( typeOf === 'number' ) {

		return 'float';

	} else if ( typeOf === 'boolean' ) {

		return 'bool';

	} else if ( typeOf === 'string' ) {

		return 'string';

	} else if ( typeOf === 'function' ) {

		return 'shader';

	} else if ( value.isVector2 === true ) {

		return 'vec2';

	} else if ( value.isVector3 === true ) {

		return 'vec3';

	} else if ( value.isVector4 === true ) {

		return 'vec4';

	} else if ( value.isMatrix3 === true ) {

		return 'mat3';

	} else if ( value.isMatrix4 === true ) {

		return 'mat4';

	} else if ( value.isColor === true ) {

		return 'color';

	} else if ( value instanceof ArrayBuffer ) {

		return 'ArrayBuffer';

	}

	return null;

}

function getValueFromType( type, ...params ) {

	const last4 = type ? type.slice( - 4 ) : undefined;

	if ( params.length === 1 ) { // ensure same behaviour as in NodeBuilder.format()

		if ( last4 === 'vec2' ) params = [ params[ 0 ], params[ 0 ] ];
		else if ( last4 === 'vec3' ) params = [ params[ 0 ], params[ 0 ], params[ 0 ] ];
		else if ( last4 === 'vec4' ) params = [ params[ 0 ], params[ 0 ], params[ 0 ], params[ 0 ] ];

	}

	if ( type === 'color' ) {

		return new Color( ...params );

	} else if ( last4 === 'vec2' ) {

		return new Vector2( ...params );

	} else if ( last4 === 'vec3' ) {

		return new Vector3( ...params );

	} else if ( last4 === 'vec4' ) {

		return new Vector4( ...params );

	} else if ( last4 === 'mat3' ) {

		return new Matrix3( ...params );

	} else if ( last4 === 'mat4' ) {

		return new Matrix4( ...params );

	} else if ( type === 'bool' ) {

		return params[ 0 ] || false;

	} else if ( ( type === 'float' ) || ( type === 'int' ) || ( type === 'uint' ) ) {

		return params[ 0 ] || 0;

	} else if ( type === 'string' ) {

		return params[ 0 ] || '';

	} else if ( type === 'ArrayBuffer' ) {

		return base64ToArrayBuffer( params[ 0 ] );

	}

	return null;

}

function arrayBufferToBase64( arrayBuffer ) {

	let chars = '';

	const array = new Uint8Array( arrayBuffer );

	for ( let i = 0; i < array.length; i ++ ) {

		chars += String.fromCharCode( array[ i ] );

	}

	return btoa( chars );

}

function base64ToArrayBuffer( base64 ) {

	return Uint8Array.from( atob( base64 ), c => c.charCodeAt( 0 ) ).buffer;

}

var NodeUtils = /*#__PURE__*/Object.freeze({
	__proto__: null,
	arrayBufferToBase64: arrayBufferToBase64,
	base64ToArrayBuffer: base64ToArrayBuffer,
	getCacheKey: getCacheKey,
	getNodeChildren: getNodeChildren,
	getValueFromType: getValueFromType,
	getValueType: getValueType
});

const NodeClasses = new Map();

let _nodeId = 0;

class Node extends EventDispatcher {

	constructor( nodeType = null ) {

		super();

		this.nodeType = nodeType;

		this.updateType = NodeUpdateType.NONE;
		this.updateBeforeType = NodeUpdateType.NONE;
		this.updateAfterType = NodeUpdateType.NONE;

		this.uuid = MathUtils.generateUUID();

		this.version = 0;

		this._cacheKey = null;
		this._cacheKeyVersion = 0;

		this.global = false;

		this.isNode = true;

		Object.defineProperty( this, 'id', { value: _nodeId ++ } );

	}

	set needsUpdate( value ) {

		if ( value === true ) {

			this.version ++;

		}

	}

	get type() {

		return this.constructor.type;

	}

	onUpdate( callback, updateType ) {

		this.updateType = updateType;
		this.update = callback.bind( this.getSelf() );

		return this;

	}

	onFrameUpdate( callback ) {

		return this.onUpdate( callback, NodeUpdateType.FRAME );

	}

	onRenderUpdate( callback ) {

		return this.onUpdate( callback, NodeUpdateType.RENDER );

	}

	onObjectUpdate( callback ) {

		return this.onUpdate( callback, NodeUpdateType.OBJECT );

	}

	onReference( callback ) {

		this.updateReference = callback.bind( this.getSelf() );

		return this;

	}

	getSelf() {

		// Returns non-node object.

		return this.self || this;

	}

	updateReference( /*state*/ ) {

		return this;

	}

	isGlobal( /*builder*/ ) {

		return this.global;

	}

	* getChildren() {

		for ( const { childNode } of getNodeChildren( this ) ) {

			yield childNode;

		}

	}

	dispose() {

		this.dispatchEvent( { type: 'dispose' } );

	}

	traverse( callback ) {

		callback( this );

		for ( const childNode of this.getChildren() ) {

			childNode.traverse( callback );

		}

	}

	getCacheKey( force = false ) {

		force = force || this.version !== this._cacheKeyVersion;

		if ( force === true || this._cacheKey === null ) {

			this._cacheKey = getCacheKey( this, force );
			this._cacheKeyVersion = this.version;

		}

		return this._cacheKey;

	}

	getHash( /*builder*/ ) {

		return this.uuid;

	}

	getUpdateType() {

		return this.updateType;

	}

	getUpdateBeforeType() {

		return this.updateBeforeType;

	}

	getUpdateAfterType() {

		return this.updateAfterType;

	}

	getElementType( builder ) {

		const type = this.getNodeType( builder );
		const elementType = builder.getElementType( type );

		return elementType;

	}

	getNodeType( builder ) {

		const nodeProperties = builder.getNodeProperties( this );

		if ( nodeProperties.outputNode ) {

			return nodeProperties.outputNode.getNodeType( builder );

		}

		return this.nodeType;

	}

	getShared( builder ) {

		const hash = this.getHash( builder );
		const nodeFromHash = builder.getNodeFromHash( hash );

		return nodeFromHash || this;

	}

	setup( builder ) {

		const nodeProperties = builder.getNodeProperties( this );

		let index = 0;

		for ( const childNode of this.getChildren() ) {

			nodeProperties[ 'node' + index ++ ] = childNode;

		}

		// return a outputNode if exists
		return null;

	}

	construct( builder ) { // @deprecated, r157

		console.warn( 'THREE.Node: construct() is deprecated. Use setup() instead.' );

		return this.setup( builder );

	}

	increaseUsage( builder ) {

		const nodeData = builder.getDataFromNode( this );
		nodeData.usageCount = nodeData.usageCount === undefined ? 1 : nodeData.usageCount + 1;

		return nodeData.usageCount;

	}

	analyze( builder ) {

		const usageCount = this.increaseUsage( builder );

		if ( usageCount === 1 ) {

			// node flow children

			const nodeProperties = builder.getNodeProperties( this );

			for ( const childNode of Object.values( nodeProperties ) ) {

				if ( childNode && childNode.isNode === true ) {

					childNode.build( builder );

				}

			}

		}

	}

	generate( builder, output ) {

		const { outputNode } = builder.getNodeProperties( this );

		if ( outputNode && outputNode.isNode === true ) {

			return outputNode.build( builder, output );

		}

	}

	updateBefore( /*frame*/ ) {

		console.warn( 'Abstract function.' );

	}

	updateAfter( /*frame*/ ) {

		console.warn( 'Abstract function.' );

	}

	update( /*frame*/ ) {

		console.warn( 'Abstract function.' );

	}

	build( builder, output = null ) {

		const refNode = this.getShared( builder );

		if ( this !== refNode ) {

			return refNode.build( builder, output );

		}

		builder.addNode( this );
		builder.addChain( this );

		/* Build stages expected results:
			- "setup"		-> Node
			- "analyze"		-> null
			- "generate"	-> String
		*/
		let result = null;

		const buildStage = builder.getBuildStage();

		if ( buildStage === 'setup' ) {

			this.updateReference( builder );

			const properties = builder.getNodeProperties( this );

			if ( properties.initialized !== true ) {

				const stackNodesBeforeSetup = builder.stack.nodes.length;

				properties.initialized = true;
				properties.outputNode = this.setup( builder );

				if ( properties.outputNode !== null && builder.stack.nodes.length !== stackNodesBeforeSetup ) {

					properties.outputNode = builder.stack;

				}

				for ( const childNode of Object.values( properties ) ) {

					if ( childNode && childNode.isNode === true ) {

						childNode.build( builder );

					}

				}

			}

		} else if ( buildStage === 'analyze' ) {

			this.analyze( builder );

		} else if ( buildStage === 'generate' ) {

			const isGenerateOnce = this.generate.length === 1;

			if ( isGenerateOnce ) {

				const type = this.getNodeType( builder );
				const nodeData = builder.getDataFromNode( this );

				result = nodeData.snippet;

				if ( result === undefined ) {

					result = this.generate( builder ) || '';

					nodeData.snippet = result;

				}

				result = builder.format( result, type, output );

			} else {

				result = this.generate( builder, output ) || '';

			}

		}

		builder.removeChain( this );

		return result;

	}

	getSerializeChildren() {

		return getNodeChildren( this );

	}

	serialize( json ) {

		const nodeChildren = this.getSerializeChildren();

		const inputNodes = {};

		for ( const { property, index, childNode } of nodeChildren ) {

			if ( index !== undefined ) {

				if ( inputNodes[ property ] === undefined ) {

					inputNodes[ property ] = Number.isInteger( index ) ? [] : {};

				}

				inputNodes[ property ][ index ] = childNode.toJSON( json.meta ).uuid;

			} else {

				inputNodes[ property ] = childNode.toJSON( json.meta ).uuid;

			}

		}

		if ( Object.keys( inputNodes ).length > 0 ) {

			json.inputNodes = inputNodes;

		}

	}

	deserialize( json ) {

		if ( json.inputNodes !== undefined ) {

			const nodes = json.meta.nodes;

			for ( const property in json.inputNodes ) {

				if ( Array.isArray( json.inputNodes[ property ] ) ) {

					const inputArray = [];

					for ( const uuid of json.inputNodes[ property ] ) {

						inputArray.push( nodes[ uuid ] );

					}

					this[ property ] = inputArray;

				} else if ( typeof json.inputNodes[ property ] === 'object' ) {

					const inputObject = {};

					for ( const subProperty in json.inputNodes[ property ] ) {

						const uuid = json.inputNodes[ property ][ subProperty ];

						inputObject[ subProperty ] = nodes[ uuid ];

					}

					this[ property ] = inputObject;

				} else {

					const uuid = json.inputNodes[ property ];

					this[ property ] = nodes[ uuid ];

				}

			}

		}

	}

	toJSON( meta ) {

		const { uuid, type } = this;
		const isRoot = ( meta === undefined || typeof meta === 'string' );

		if ( isRoot ) {

			meta = {
				textures: {},
				images: {},
				nodes: {}
			};

		}

		// serialize

		let data = meta.nodes[ uuid ];

		if ( data === undefined ) {

			data = {
				uuid,
				type,
				meta,
				metadata: {
					version: 4.6,
					type: 'Node',
					generator: 'Node.toJSON'
				}
			};

			if ( isRoot !== true ) meta.nodes[ data.uuid ] = data;

			this.serialize( data );

			delete data.meta;

		}

		// TODO: Copied from Object3D.toJSON

		function extractFromCache( cache ) {

			const values = [];

			for ( const key in cache ) {

				const data = cache[ key ];
				delete data.metadata;
				values.push( data );

			}

			return values;

		}

		if ( isRoot ) {

			const textures = extractFromCache( meta.textures );
			const images = extractFromCache( meta.images );
			const nodes = extractFromCache( meta.nodes );

			if ( textures.length > 0 ) data.textures = textures;
			if ( images.length > 0 ) data.images = images;
			if ( nodes.length > 0 ) data.nodes = nodes;

		}

		return data;

	}

}

function addNodeClass( type, nodeClass ) {

	if ( typeof nodeClass !== 'function' || ! type ) throw new Error( `Node class ${ type } is not a class` );
	if ( NodeClasses.has( type ) ) {

		console.warn( `Redefinition of node class ${ type }` );
		return;

	}

	NodeClasses.set( type, nodeClass );
	nodeClass.type = type;

}

function createNodeFromType( type ) {

	const Class = NodeClasses.get( type );

	if ( Class !== undefined ) {

		return new Class();

	}

}

class TempNode extends Node {

	constructor( type ) {

		super( type );

		this.isTempNode = true;

	}

	hasDependencies( builder ) {

		return builder.getDataFromNode( this ).usageCount > 1;

	}

	build( builder, output ) {

		const buildStage = builder.getBuildStage();

		if ( buildStage === 'generate' ) {

			const type = builder.getVectorType( this.getNodeType( builder, output ) );
			const nodeData = builder.getDataFromNode( this );

			if ( nodeData.propertyName !== undefined ) {

				return builder.format( nodeData.propertyName, type, output );

			} else if ( type !== 'void' && output !== 'void' && this.hasDependencies( builder ) ) {

				const snippet = super.build( builder, type );

				const nodeVar = builder.getVarFromNode( this, null, type );
				const propertyName = builder.getPropertyName( nodeVar );

				builder.addLineFlowCode( `${propertyName} = ${snippet}` );

				nodeData.snippet = snippet;
				nodeData.propertyName = propertyName;

				return builder.format( nodeData.propertyName, type, output );

			}

		}

		return super.build( builder, output );

	}

}

addNodeClass( 'TempNode', TempNode );

class ArrayElementNode extends Node { // @TODO: If extending from TempNode it breaks webgpu_compute

	constructor( node, indexNode ) {

		super();

		this.node = node;
		this.indexNode = indexNode;

		this.isArrayElementNode = true;

	}

	getNodeType( builder ) {

		return this.node.getElementType( builder );

	}

	generate( builder ) {

		const nodeSnippet = this.node.build( builder );
		const indexSnippet = this.indexNode.build( builder, 'uint' );

		return `${nodeSnippet}[ ${indexSnippet} ]`;

	}

}

addNodeClass( 'ArrayElementNode', ArrayElementNode );

class ConvertNode extends Node {

	constructor( node, convertTo ) {

		super();

		this.node = node;
		this.convertTo = convertTo;

	}

	getNodeType( builder ) {

		const requestType = this.node.getNodeType( builder );

		let convertTo = null;

		for ( const overloadingType of this.convertTo.split( '|' ) ) {

			if ( convertTo === null || builder.getTypeLength( requestType ) === builder.getTypeLength( overloadingType ) ) {

				convertTo = overloadingType;

			}

		}

		return convertTo;

	}

	serialize( data ) {

		super.serialize( data );

		data.convertTo = this.convertTo;

	}

	deserialize( data ) {

		super.deserialize( data );

		this.convertTo = data.convertTo;

	}

	generate( builder, output ) {

		const node = this.node;
		const type = this.getNodeType( builder );

		const snippet = node.build( builder, type );

		return builder.format( snippet, type, output );

	}

}

addNodeClass( 'ConvertNode', ConvertNode );

class JoinNode extends TempNode {

	constructor( nodes = [], nodeType = null ) {

		super( nodeType );

		this.nodes = nodes;

	}

	getNodeType( builder ) {

		if ( this.nodeType !== null ) {

			return builder.getVectorType( this.nodeType );

		}

		return builder.getTypeFromLength( this.nodes.reduce( ( count, cur ) => count + builder.getTypeLength( cur.getNodeType( builder ) ), 0 ) );

	}

	generate( builder, output ) {

		const type = this.getNodeType( builder );
		const nodes = this.nodes;

		const primitiveType = builder.getComponentType( type );

		const snippetValues = [];

		for ( const input of nodes ) {

			let inputSnippet = input.build( builder );

			const inputPrimitiveType = builder.getComponentType( input.getNodeType( builder ) );

			if ( inputPrimitiveType !== primitiveType ) {

				inputSnippet = builder.format( inputSnippet, inputPrimitiveType, primitiveType );

			}

			snippetValues.push( inputSnippet );

		}

		const snippet = `${ builder.getType( type ) }( ${ snippetValues.join( ', ' ) } )`;

		return builder.format( snippet, type, output );

	}

}

addNodeClass( 'JoinNode', JoinNode );

const stringVectorComponents = vectorComponents.join( '' );

class SplitNode extends Node {

	constructor( node, components = 'x' ) {

		super();

		this.node = node;
		this.components = components;

		this.isSplitNode = true;

	}

	getVectorLength() {

		let vectorLength = this.components.length;

		for ( const c of this.components ) {

			vectorLength = Math.max( vectorComponents.indexOf( c ) + 1, vectorLength );

		}

		return vectorLength;

	}

	getComponentType( builder ) {

		return builder.getComponentType( this.node.getNodeType( builder ) );

	}

	getNodeType( builder ) {

		return builder.getTypeFromLength( this.components.length, this.getComponentType( builder ) );

	}

	generate( builder, output ) {

		const node = this.node;
		const nodeTypeLength = builder.getTypeLength( node.getNodeType( builder ) );

		let snippet = null;

		if ( nodeTypeLength > 1 ) {

			let type = null;

			const componentsLength = this.getVectorLength();

			if ( componentsLength >= nodeTypeLength ) {

				// needed expand the input node

				type = builder.getTypeFromLength( this.getVectorLength(), this.getComponentType( builder ) );

			}

			const nodeSnippet = node.build( builder, type );

			if ( this.components.length === nodeTypeLength && this.components === stringVectorComponents.slice( 0, this.components.length ) ) {

				// unnecessary swizzle

				snippet = builder.format( nodeSnippet, type, output );

			} else {

				snippet = builder.format( `${nodeSnippet}.${this.components}`, this.getNodeType( builder ), output );

			}

		} else {

			// ignore .components if .node returns float/integer

			snippet = node.build( builder, output );

		}

		return snippet;

	}

	serialize( data ) {

		super.serialize( data );

		data.components = this.components;

	}

	deserialize( data ) {

		super.deserialize( data );

		this.components = data.components;

	}

}

addNodeClass( 'SplitNode', SplitNode );

class SetNode extends TempNode {

	constructor( sourceNode, components, targetNode ) {

		super();

		this.sourceNode = sourceNode;
		this.components = components;
		this.targetNode = targetNode;

	}

	getNodeType( builder ) {

		return this.sourceNode.getNodeType( builder );

	}

	generate( builder ) {

		const { sourceNode, components, targetNode } = this;

		const sourceType = this.getNodeType( builder );
		const targetType = builder.getTypeFromLength( components.length );

		const targetSnippet = targetNode.build( builder, targetType );
		const sourceSnippet = sourceNode.build( builder, sourceType );

		const length = builder.getTypeLength( sourceType );
		const snippetValues = [];

		for ( let i = 0; i < length; i ++ ) {

			const component = vectorComponents[ i ];

			if ( component === components[ 0 ] ) {

				snippetValues.push( targetSnippet );

				i += components.length - 1;

			} else {

				snippetValues.push( sourceSnippet + '.' + component );

			}

		}

		return `${ builder.getType( sourceType ) }( ${ snippetValues.join( ', ' ) } )`;

	}

}

addNodeClass( 'SetNode', SetNode );

class InputNode extends Node {

	constructor( value, nodeType = null ) {

		super( nodeType );

		this.isInputNode = true;

		this.value = value;
		this.precision = null;

	}

	getNodeType( /*builder*/ ) {

		if ( this.nodeType === null ) {

			return getValueType( this.value );

		}

		return this.nodeType;

	}

	getInputType( builder ) {

		return this.getNodeType( builder );

	}

	setPrecision( precision ) {

		this.precision = precision;

		return this;

	}

	serialize( data ) {

		super.serialize( data );

		data.value = this.value;

		if ( this.value && this.value.toArray ) data.value = this.value.toArray();

		data.valueType = getValueType( this.value );
		data.nodeType = this.nodeType;

		if ( data.valueType === 'ArrayBuffer' ) data.value = arrayBufferToBase64( data.value );

		data.precision = this.precision;

	}

	deserialize( data ) {

		super.deserialize( data );

		this.nodeType = data.nodeType;
		this.value = Array.isArray( data.value ) ? getValueFromType( data.valueType, ...data.value ) : data.value;

		this.precision = data.precision || null;

		if ( this.value && this.value.fromArray ) this.value = this.value.fromArray( data.value );

	}

	generate( /*builder, output*/ ) {

		console.warn( 'Abstract function.' );

	}

}

addNodeClass( 'InputNode', InputNode );

class ConstNode extends InputNode {

	constructor( value, nodeType = null ) {

		super( value, nodeType );

		this.isConstNode = true;

	}

	generateConst( builder ) {

		return builder.generateConst( this.getNodeType( builder ), this.value );

	}

	generate( builder, output ) {

		const type = this.getNodeType( builder );

		return builder.format( this.generateConst( builder ), type, output );

	}

}

addNodeClass( 'ConstNode', ConstNode );

//

let currentStack = null;

const NodeElements = new Map(); // @TODO: Currently only a few nodes are added, probably also add others

function addNodeElement( name, nodeElement ) {

	if ( NodeElements.has( name ) ) {

		console.warn( `Redefinition of node element ${ name }` );
		return;

	}

	if ( typeof nodeElement !== 'function' ) throw new Error( `Node element ${ name } is not a function` );

	NodeElements.set( name, nodeElement );

}

const parseSwizzle = ( props ) => props.replace( /r|s/g, 'x' ).replace( /g|t/g, 'y' ).replace( /b|p/g, 'z' ).replace( /a|q/g, 'w' );

const shaderNodeHandler = {

	setup( NodeClosure, params ) {

		const inputs = params.shift();

		return NodeClosure( nodeObjects( inputs ), ...params );

	},

	get( node, prop, nodeObj ) {

		if ( typeof prop === 'string' && node[ prop ] === undefined ) {

			if ( node.isStackNode !== true && prop === 'assign' ) {

				return ( ...params ) => {

					currentStack.assign( nodeObj, ...params );

					return nodeObj;

				};

			} else if ( NodeElements.has( prop ) ) {

				const nodeElement = NodeElements.get( prop );

				return node.isStackNode ? ( ...params ) => nodeObj.add( nodeElement( ...params ) ) : ( ...params ) => nodeElement( nodeObj, ...params );

			} else if ( prop === 'self' ) {

				return node;

			} else if ( prop.endsWith( 'Assign' ) && NodeElements.has( prop.slice( 0, prop.length - 'Assign'.length ) ) ) {

				const nodeElement = NodeElements.get( prop.slice( 0, prop.length - 'Assign'.length ) );

				return node.isStackNode ? ( ...params ) => nodeObj.assign( params[ 0 ], nodeElement( ...params ) ) : ( ...params ) => nodeObj.assign( nodeElement( nodeObj, ...params ) );

			} else if ( /^[xyzwrgbastpq]{1,4}$/.test( prop ) === true ) {

				// accessing properties ( swizzle )

				prop = parseSwizzle( prop );

				return nodeObject( new SplitNode( nodeObj, prop ) );

			} else if ( /^set[XYZWRGBASTPQ]{1,4}$/.test( prop ) === true ) {

				// set properties ( swizzle )

				prop = parseSwizzle( prop.slice( 3 ).toLowerCase() );

				// sort to xyzw sequence

				prop = prop.split( '' ).sort().join( '' );

				return ( value ) => nodeObject( new SetNode( node, prop, value ) );

			} else if ( prop === 'width' || prop === 'height' || prop === 'depth' ) {

				// accessing property

				if ( prop === 'width' ) prop = 'x';
				else if ( prop === 'height' ) prop = 'y';
				else if ( prop === 'depth' ) prop = 'z';

				return nodeObject( new SplitNode( node, prop ) );

			} else if ( /^\d+$/.test( prop ) === true ) {

				// accessing array

				return nodeObject( new ArrayElementNode( nodeObj, new ConstNode( Number( prop ), 'uint' ) ) );

			}

		}

		return Reflect.get( node, prop, nodeObj );

	},

	set( node, prop, value, nodeObj ) {

		if ( typeof prop === 'string' && node[ prop ] === undefined ) {

			// setting properties

			if ( /^[xyzwrgbastpq]{1,4}$/.test( prop ) === true || prop === 'width' || prop === 'height' || prop === 'depth' || /^\d+$/.test( prop ) === true ) {

				nodeObj[ prop ].assign( value );

				return true;

			}

		}

		return Reflect.set( node, prop, value, nodeObj );

	}

};

const nodeObjectsCacheMap = new WeakMap();
const nodeBuilderFunctionsCacheMap = new WeakMap();

const ShaderNodeObject = function ( obj, altType = null ) {

	const type = getValueType( obj );

	if ( type === 'node' ) {

		let nodeObject = nodeObjectsCacheMap.get( obj );

		if ( nodeObject === undefined ) {

			nodeObject = new Proxy( obj, shaderNodeHandler );

			nodeObjectsCacheMap.set( obj, nodeObject );
			nodeObjectsCacheMap.set( nodeObject, nodeObject );

		}

		return nodeObject;

	} else if ( ( altType === null && ( type === 'float' || type === 'boolean' ) ) || ( type && type !== 'shader' && type !== 'string' ) ) {

		return nodeObject( getConstNode( obj, altType ) );

	} else if ( type === 'shader' ) {

		return tslFn( obj );

	}

	return obj;

};

const ShaderNodeObjects = function ( objects, altType = null ) {

	for ( const name in objects ) {

		objects[ name ] = nodeObject( objects[ name ], altType );

	}

	return objects;

};

const ShaderNodeArray = function ( array, altType = null ) {

	const len = array.length;

	for ( let i = 0; i < len; i ++ ) {

		array[ i ] = nodeObject( array[ i ], altType );

	}

	return array;

};

const ShaderNodeProxy = function ( NodeClass, scope = null, factor = null, settings = null ) {

	const assignNode = ( node ) => nodeObject( settings !== null ? Object.assign( node, settings ) : node );

	if ( scope === null ) {

		return ( ...params ) => {

			return assignNode( new NodeClass( ...nodeArray( params ) ) );

		};

	} else if ( factor !== null ) {

		factor = nodeObject( factor );

		return ( ...params ) => {

			return assignNode( new NodeClass( scope, ...nodeArray( params ), factor ) );

		};

	} else {

		return ( ...params ) => {

			return assignNode( new NodeClass( scope, ...nodeArray( params ) ) );

		};

	}

};

const ShaderNodeImmutable = function ( NodeClass, ...params ) {

	return nodeObject( new NodeClass( ...nodeArray( params ) ) );

};

class ShaderCallNodeInternal extends Node {

	constructor( shaderNode, inputNodes ) {

		super();

		this.shaderNode = shaderNode;
		this.inputNodes = inputNodes;

	}

	getNodeType( builder ) {

		const properties = builder.getNodeProperties( this );

		if ( properties.outputNode === null ) {

			properties.outputNode = this.setupOutput( builder );

		}

		return properties.outputNode.getNodeType( builder );

	}

	call( builder ) {

		const { shaderNode, inputNodes } = this;

		if ( shaderNode.layout ) {

			let functionNodesCacheMap = nodeBuilderFunctionsCacheMap.get( builder.constructor );

			if ( functionNodesCacheMap === undefined ) {

				functionNodesCacheMap = new WeakMap();

				nodeBuilderFunctionsCacheMap.set( builder.constructor, functionNodesCacheMap );

			}

			let functionNode = functionNodesCacheMap.get( shaderNode );

			if ( functionNode === undefined ) {

				functionNode = nodeObject( builder.buildFunctionNode( shaderNode ) );

				functionNodesCacheMap.set( shaderNode, functionNode );

			}

			if ( builder.currentFunctionNode !== null ) {

				builder.currentFunctionNode.includes.push( functionNode );

			}

			return nodeObject( functionNode.call( inputNodes ) );

		}

		const jsFunc = shaderNode.jsFunc;
		const outputNode = inputNodes !== null ? jsFunc( inputNodes, builder.stack, builder ) : jsFunc( builder.stack, builder );

		return nodeObject( outputNode );

	}

	setup( builder ) {

		const { outputNode } = builder.getNodeProperties( this );

		return outputNode || this.setupOutput( builder );

	}

	setupOutput( builder ) {

		builder.addStack();

		builder.stack.outputNode = this.call( builder );

		return builder.removeStack();

	}

	generate( builder, output ) {

		const { outputNode } = builder.getNodeProperties( this );

		if ( outputNode === null ) {

			// TSL: It's recommended to use `tslFn` in setup() pass.

			return this.call( builder ).build( builder, output );

		}

		return super.generate( builder, output );

	}

}

class ShaderNodeInternal extends Node {

	constructor( jsFunc ) {

		super();

		this.jsFunc = jsFunc;
		this.layout = null;

		this.global = true;

	}

	get isArrayInput() {

		return /^\((\s+)?\[/.test( this.jsFunc.toString() );

	}

	setLayout( layout ) {

		this.layout = layout;

		return this;

	}

	call( inputs = null ) {

		nodeObjects( inputs );

		return nodeObject( new ShaderCallNodeInternal( this, inputs ) );

	}

	setup() {

		return this.call();

	}

}

const bools = [ false, true ];
const uints = [ 0, 1, 2, 3 ];
const ints = [ - 1, - 2 ];
const floats = [ 0.5, 1.5, 1 / 3, 1e-6, 1e6, Math.PI, Math.PI * 2, 1 / Math.PI, 2 / Math.PI, 1 / ( Math.PI * 2 ), Math.PI / 2 ];

const boolsCacheMap = new Map();
for ( const bool of bools ) boolsCacheMap.set( bool, new ConstNode( bool ) );

const uintsCacheMap = new Map();
for ( const uint of uints ) uintsCacheMap.set( uint, new ConstNode( uint, 'uint' ) );

const intsCacheMap = new Map( [ ...uintsCacheMap ].map( el => new ConstNode( el.value, 'int' ) ) );
for ( const int of ints ) intsCacheMap.set( int, new ConstNode( int, 'int' ) );

const floatsCacheMap = new Map( [ ...intsCacheMap ].map( el => new ConstNode( el.value ) ) );
for ( const float of floats ) floatsCacheMap.set( float, new ConstNode( float ) );
for ( const float of floats ) floatsCacheMap.set( - float, new ConstNode( - float ) );

const cacheMaps = { bool: boolsCacheMap, uint: uintsCacheMap, ints: intsCacheMap, float: floatsCacheMap };

const constNodesCacheMap = new Map( [ ...boolsCacheMap, ...floatsCacheMap ] );

const getConstNode = ( value, type ) => {

	if ( constNodesCacheMap.has( value ) ) {

		return constNodesCacheMap.get( value );

	} else if ( value.isNode === true ) {

		return value;

	} else {

		return new ConstNode( value, type );

	}

};

const safeGetNodeType = ( node ) => {

	try {

		return node.getNodeType();

	} catch ( _ ) {

		return undefined;

	}

};

const ConvertType = function ( type, cacheMap = null ) {

	return ( ...params ) => {

		if ( params.length === 0 || ( ! [ 'bool', 'float', 'int', 'uint' ].includes( type ) && params.every( param => typeof param !== 'object' ) ) ) {

			params = [ getValueFromType( type, ...params ) ];

		}

		if ( params.length === 1 && cacheMap !== null && cacheMap.has( params[ 0 ] ) ) {

			return nodeObject( cacheMap.get( params[ 0 ] ) );

		}

		if ( params.length === 1 ) {

			const node = getConstNode( params[ 0 ], type );
			if ( safeGetNodeType( node ) === type ) return nodeObject( node );
			return nodeObject( new ConvertNode( node, type ) );

		}

		const nodes = params.map( param => getConstNode( param ) );
		return nodeObject( new JoinNode( nodes, type ) );

	};

};

// exports

const defined = ( value ) => value && value.value;

// utils

const getConstNodeType = ( value ) => ( value !== undefined && value !== null ) ? ( value.nodeType || value.convertTo || ( typeof value === 'string' ? value : null ) ) : null;

// shader node base

function ShaderNode( jsFunc ) {

	return new Proxy( new ShaderNodeInternal( jsFunc ), shaderNodeHandler );

}

const nodeObject = ( val, altType = null ) => /* new */ ShaderNodeObject( val, altType );
const nodeObjects = ( val, altType = null ) => new ShaderNodeObjects( val, altType );
const nodeArray = ( val, altType = null ) => new ShaderNodeArray( val, altType );
const nodeProxy = ( ...params ) => new ShaderNodeProxy( ...params );
const nodeImmutable = ( ...params ) => new ShaderNodeImmutable( ...params );

const tslFn = ( jsFunc ) => {

	const shaderNode = new ShaderNode( jsFunc );

	const fn = ( ...params ) => {

		let inputs;

		nodeObjects( params );

		if ( params[ 0 ] && params[ 0 ].isNode ) {

			inputs = [ ...params ];

		} else {

			inputs = params[ 0 ];

		}

		return shaderNode.call( inputs );

	};

	fn.shaderNode = shaderNode;
	fn.setLayout = ( layout ) => {

		shaderNode.setLayout( layout );

		return fn;

	};

	return fn;

};

addNodeClass( 'ShaderNode', ShaderNode );

//

addNodeElement( 'toGlobal', ( node ) => {

	node.global = true;

	return node;

} );

//

const setCurrentStack = ( stack ) => {

	currentStack = stack;

};

const getCurrentStack = () => currentStack;

const If = ( ...params ) => currentStack.if( ...params );

function append( node ) {

	if ( currentStack ) currentStack.add( node );

	return node;

}

addNodeElement( 'append', append );

// types
// @TODO: Maybe export from ConstNode.js?

const color = new ConvertType( 'color' );

const float = new ConvertType( 'float', cacheMaps.float );
const int = new ConvertType( 'int', cacheMaps.ints );
const uint = new ConvertType( 'uint', cacheMaps.uint );
const bool = new ConvertType( 'bool', cacheMaps.bool );

const vec2 = new ConvertType( 'vec2' );
const ivec2 = new ConvertType( 'ivec2' );
const uvec2 = new ConvertType( 'uvec2' );
const bvec2 = new ConvertType( 'bvec2' );

const vec3 = new ConvertType( 'vec3' );
const ivec3 = new ConvertType( 'ivec3' );
const uvec3 = new ConvertType( 'uvec3' );
const bvec3 = new ConvertType( 'bvec3' );

const vec4 = new ConvertType( 'vec4' );
const ivec4 = new ConvertType( 'ivec4' );
const uvec4 = new ConvertType( 'uvec4' );
const bvec4 = new ConvertType( 'bvec4' );

const mat2 = new ConvertType( 'mat2' );
const imat2 = new ConvertType( 'imat2' );
const umat2 = new ConvertType( 'umat2' );
const bmat2 = new ConvertType( 'bmat2' );

const mat3 = new ConvertType( 'mat3' );
const imat3 = new ConvertType( 'imat3' );
const umat3 = new ConvertType( 'umat3' );
const bmat3 = new ConvertType( 'bmat3' );

const mat4 = new ConvertType( 'mat4' );
const imat4 = new ConvertType( 'imat4' );
const umat4 = new ConvertType( 'umat4' );
const bmat4 = new ConvertType( 'bmat4' );

const string = ( value = '' ) => nodeObject( new ConstNode( value, 'string' ) );
const arrayBuffer = ( value ) => nodeObject( new ConstNode( value, 'ArrayBuffer' ) );

addNodeElement( 'toColor', color );
addNodeElement( 'toFloat', float );
addNodeElement( 'toInt', int );
addNodeElement( 'toUint', uint );
addNodeElement( 'toBool', bool );
addNodeElement( 'toVec2', vec2 );
addNodeElement( 'toIvec2', ivec2 );
addNodeElement( 'toUvec2', uvec2 );
addNodeElement( 'toBvec2', bvec2 );
addNodeElement( 'toVec3', vec3 );
addNodeElement( 'toIvec3', ivec3 );
addNodeElement( 'toUvec3', uvec3 );
addNodeElement( 'toBvec3', bvec3 );
addNodeElement( 'toVec4', vec4 );
addNodeElement( 'toIvec4', ivec4 );
addNodeElement( 'toUvec4', uvec4 );
addNodeElement( 'toBvec4', bvec4 );
addNodeElement( 'toMat2', mat2 );
addNodeElement( 'toImat2', imat2 );
addNodeElement( 'toUmat2', umat2 );
addNodeElement( 'toBmat2', bmat2 );
addNodeElement( 'toMat3', mat3 );
addNodeElement( 'toImat3', imat3 );
addNodeElement( 'toUmat3', umat3 );
addNodeElement( 'toBmat3', bmat3 );
addNodeElement( 'toMat4', mat4 );
addNodeElement( 'toImat4', imat4 );
addNodeElement( 'toUmat4', umat4 );
addNodeElement( 'toBmat4', bmat4 );

// basic nodes
// HACK - we cannot export them from the corresponding files because of the cyclic dependency
const element = nodeProxy( ArrayElementNode );
const convert = ( node, types ) => nodeObject( new ConvertNode( nodeObject( node ), types ) );
const split = ( node, channels ) => nodeObject( new SplitNode( nodeObject( node ), channels ) );

addNodeElement( 'element', element );
addNodeElement( 'convert', convert );

class AssignNode extends TempNode {

	constructor( targetNode, sourceNode ) {

		super();

		this.targetNode = targetNode;
		this.sourceNode = sourceNode;

	}

	hasDependencies() {

		return false;

	}

	getNodeType( builder, output ) {

		return output !== 'void' ? this.targetNode.getNodeType( builder ) : 'void';

	}

	needsSplitAssign( builder ) {

		const { targetNode } = this;

		if ( builder.isAvailable( 'swizzleAssign' ) === false && targetNode.isSplitNode && targetNode.components.length > 1 ) {

			const targetLength = builder.getTypeLength( targetNode.node.getNodeType( builder ) );
			const assignDiferentVector = vectorComponents.join( '' ).slice( 0, targetLength ) !== targetNode.components;

			return assignDiferentVector;

		}

		return false;

	}

	generate( builder, output ) {

		const { targetNode, sourceNode } = this;

		const needsSplitAssign = this.needsSplitAssign( builder );

		const targetType = targetNode.getNodeType( builder );

		const target = targetNode.context( { assign: true } ).build( builder );
		const source = sourceNode.build( builder, targetType );

		const sourceType = sourceNode.getNodeType( builder );

		const nodeData = builder.getDataFromNode( this );

		//

		let snippet;

		if ( nodeData.initialized === true ) {

			if ( output !== 'void' ) {

				snippet = target;

			}

		} else if ( needsSplitAssign ) {

			const sourceVar = builder.getVarFromNode( this, null, targetType );
			const sourceProperty = builder.getPropertyName( sourceVar );

			builder.addLineFlowCode( `${ sourceProperty } = ${ source }` );

			const targetRoot = targetNode.node.context( { assign: true } ).build( builder );

			for ( let i = 0; i < targetNode.components.length; i ++ ) {

				const component = targetNode.components[ i ];

				builder.addLineFlowCode( `${ targetRoot }.${ component } = ${ sourceProperty }[ ${ i } ]` );

			}

			if ( output !== 'void' ) {

				snippet = target;

			}

		} else {

			snippet = `${ target } = ${ source }`;

			if ( output === 'void' || sourceType === 'void' ) {

				builder.addLineFlowCode( snippet );

				if ( output !== 'void' ) {

					snippet = target;

				}

			}

		}

		nodeData.initialized = true;

		return builder.format( snippet, targetType, output );

	}

}

const assign = nodeProxy( AssignNode );

addNodeClass( 'AssignNode', AssignNode );

addNodeElement( 'assign', assign );

class VaryingNode extends Node {

	constructor( node, name = null ) {

		super();

		this.node = node;
		this.name = name;

		this.isVaryingNode = true;

	}

	isGlobal() {

		return true;

	}

	getHash( builder ) {

		return this.name || super.getHash( builder );

	}

	getNodeType( builder ) {

		// VaryingNode is auto type

		return this.node.getNodeType( builder );

	}

	setupVarying( builder ) {

		const properties = builder.getNodeProperties( this );

		let varying = properties.varying;

		if ( varying === undefined ) {

			const name = this.name;
			const type = this.getNodeType( builder );

			properties.varying = varying = builder.getVaryingFromNode( this, name, type );
			properties.node = this.node;

		}

		// this property can be used to check if the varying can be optimized for a variable
		varying.needsInterpolation || ( varying.needsInterpolation = ( builder.shaderStage === 'fragment' ) );

		return varying;

	}

	setup( builder ) {

		this.setupVarying( builder );

	}

	analyze( builder ) {

		this.setupVarying( builder );

		return this.node.analyze( builder );

	}

	generate( builder ) {

		const properties = builder.getNodeProperties( this );
		const varying = this.setupVarying( builder );

		if ( properties.propertyName === undefined ) {

			const type = this.getNodeType( builder );
			const propertyName = builder.getPropertyName( varying, NodeShaderStage.VERTEX );

			// force node run in vertex stage
			builder.flowNodeFromShaderStage( NodeShaderStage.VERTEX, this.node, type, propertyName );

			properties.propertyName = propertyName;

		}

		return builder.getPropertyName( varying );

	}

}

const varying = nodeProxy( VaryingNode );

addNodeElement( 'varying', varying );

addNodeClass( 'VaryingNode', VaryingNode );

class AttributeNode extends Node {

	constructor( attributeName, nodeType = null, defaultNode = null ) {

		super( nodeType );

		this.defaultNode = defaultNode;

		this.global = true;

		this._attributeName = attributeName;

	}

	getHash( builder ) {

		return this.getAttributeName( builder );

	}

	getNodeType( builder ) {

		let nodeType = super.getNodeType( builder );

		if ( nodeType === null ) {

			const attributeName = this.getAttributeName( builder );

			if ( builder.hasGeometryAttribute( attributeName ) ) {

				const attribute = builder.geometry.getAttribute( attributeName );

				nodeType = builder.getTypeFromAttribute( attribute );

			} else {

				nodeType = 'float';

			}

		}

		return nodeType;

	}

	setAttributeName( attributeName ) {

		this._attributeName = attributeName;

		return this;

	}

	getAttributeName( /*builder*/ ) {

		return this._attributeName;

	}

	generate( builder ) {

		const attributeName = this.getAttributeName( builder );
		const nodeType = this.getNodeType( builder );
		const geometryAttribute = builder.hasGeometryAttribute( attributeName );

		if ( geometryAttribute === true ) {

			const attribute = builder.geometry.getAttribute( attributeName );
			const attributeType = builder.getTypeFromAttribute( attribute );

			const nodeAttribute = builder.getAttribute( attributeName, attributeType );

			if ( builder.shaderStage === 'vertex' ) {

				return builder.format( nodeAttribute.name, attributeType, nodeType );

			} else {

				const nodeVarying = varying( this );

				return nodeVarying.build( builder, nodeType );

			}

		} else {

			console.warn( `AttributeNode: Vertex attribute "${ attributeName }" not found on geometry.` );

			const { defaultNode } = this;

			if ( defaultNode !== null ) {

				return defaultNode.build( builder, nodeType );

			} else {

				return builder.generateConst( nodeType );

			}

		}

	}

}

const attribute = ( name, nodeType, defaultNode ) => nodeObject( new AttributeNode( name, nodeType, nodeObject( defaultNode ) ) );

addNodeClass( 'AttributeNode', AttributeNode );

class BypassNode extends Node {

	constructor( returnNode, callNode ) {

		super();

		this.isBypassNode = true;

		this.outputNode = returnNode;
		this.callNode = callNode;

	}

	getNodeType( builder ) {

		return this.outputNode.getNodeType( builder );

	}

	generate( builder ) {

		const snippet = this.callNode.build( builder, 'void' );

		if ( snippet !== '' ) {

			builder.addLineFlowCode( snippet );

		}

		return this.outputNode.build( builder );

	}

}

const bypass = nodeProxy( BypassNode );

addNodeElement( 'bypass', bypass );

addNodeClass( 'BypassNode', BypassNode );

class CacheNode extends Node {

	constructor( node, parent = true ) {

		super();

		this.node = node;
		this.parent = parent;

		this.isCacheNode = true;

	}

	getNodeType( builder ) {

		return this.node.getNodeType( builder );

	}

	build( builder, ...params ) {

		const previousCache = builder.getCache();
		const cache = builder.getCacheFromNode( this, parent );

		builder.setCache( cache );

		const data = this.node.build( builder, ...params );

		builder.setCache( previousCache );

		return data;

	}

}

const cache = ( node, ...params ) => nodeObject( new CacheNode( nodeObject( node ), ...params ) );

addNodeElement( 'cache', cache );

addNodeClass( 'CacheNode', CacheNode );

class ContextNode extends Node {

	constructor( node, context = {} ) {

		super();

		this.isContextNode = true;

		this.node = node;
		this.context = context;

	}

	getNodeType( builder ) {

		return this.node.getNodeType( builder );

	}

	analyze( builder ) {

		this.node.build( builder );

	}

	setup( builder ) {

		const previousContext = builder.getContext();

		builder.setContext( { ...builder.context, ...this.context } );

		const node = this.node.build( builder );

		builder.setContext( previousContext );

		return node;

	}

	generate( builder, output ) {

		const previousContext = builder.getContext();

		builder.setContext( { ...builder.context, ...this.context } );

		const snippet = this.node.build( builder, output );

		builder.setContext( previousContext );

		return snippet;

	}

}

const context = nodeProxy( ContextNode );
const label = ( node, name ) => context( node, { label: name } );

addNodeElement( 'context', context );
addNodeElement( 'label', label );

addNodeClass( 'ContextNode', ContextNode );

class IndexNode extends Node {

	constructor( scope ) {

		super( 'uint' );

		this.scope = scope;

		this.isInstanceIndexNode = true;

	}

	generate( builder ) {

		const nodeType = this.getNodeType( builder );
		const scope = this.scope;

		let propertyName;

		if ( scope === IndexNode.VERTEX ) {

			propertyName = builder.getVertexIndex();

		} else if ( scope === IndexNode.INSTANCE ) {

			propertyName = builder.getInstanceIndex();

		} else if ( scope === IndexNode.DRAW ) {

			propertyName = builder.getDrawIndex();

		} else {

			throw new Error( 'THREE.IndexNode: Unknown scope: ' + scope );

		}

		let output;

		if ( builder.shaderStage === 'vertex' || builder.shaderStage === 'compute' ) {

			output = propertyName;

		} else {

			const nodeVarying = varying( this );

			output = nodeVarying.build( builder, nodeType );

		}

		return output;

	}

}

IndexNode.VERTEX = 'vertex';
IndexNode.INSTANCE = 'instance';
IndexNode.DRAW = 'draw';

const vertexIndex = nodeImmutable( IndexNode, IndexNode.VERTEX );
const instanceIndex = nodeImmutable( IndexNode, IndexNode.INSTANCE );
const drawIndex = nodeImmutable( IndexNode, IndexNode.DRAW );

addNodeClass( 'IndexNode', IndexNode );

class LightingModel {

	start( /*input, stack, builder*/ ) { }

	finish( /*input, stack, builder*/ ) { }

	direct( /*input, stack, builder*/ ) { }

	directRectArea( /*input, stack, builder*/ ) {}

	indirectDiffuse( /*input, stack, builder*/ ) { }

	indirectSpecular( /*input, stack, builder*/ ) { }

	ambientOcclusion( /*input, stack, builder*/ ) { }

}

class VarNode extends Node {

	constructor( node, name = null ) {

		super();

		this.node = node;
		this.name = name;

		this.global = true;

		this.isVarNode = true;

	}

	getHash( builder ) {

		return this.name || super.getHash( builder );

	}

	getNodeType( builder ) {

		return this.node.getNodeType( builder );

	}

	generate( builder ) {

		const { node, name } = this;

		const nodeVar = builder.getVarFromNode( this, name, builder.getVectorType( this.getNodeType( builder ) ) );

		const propertyName = builder.getPropertyName( nodeVar );

		const snippet = node.build( builder, nodeVar.type );

		builder.addLineFlowCode( `${propertyName} = ${snippet}` );

		return propertyName;

	}

}

const temp = nodeProxy( VarNode );

addNodeElement( 'temp', temp ); // @TODO: Will be removed in the future
addNodeElement( 'toVar', ( ...params ) => temp( ...params ).append() );

addNodeClass( 'VarNode', VarNode );

class NodeAttribute {

	constructor( name, type, node = null ) {

		this.isNodeAttribute = true;

		this.name = name;
		this.type = type;
		this.node = node;

	}

}

class NodeUniform {

	constructor( name, type, node ) {

		this.isNodeUniform = true;

		this.name = name;
		this.type = type;
		this.node = node.getSelf();

	}

	get value() {

		return this.node.value;

	}

	set value( val ) {

		this.node.value = val;

	}

	get id() {

		return this.node.id;

	}

	get groupNode() {

		return this.node.groupNode;

	}

}

class NodeVar {

	constructor( name, type ) {

		this.isNodeVar = true;

		this.name = name;
		this.type = type;

	}

}

class NodeVarying extends NodeVar {

	constructor( name, type ) {

		super( name, type );

		this.needsInterpolation = false;

		this.isNodeVarying = true;

	}

}

class NodeCode {

	constructor( name, type, code = '' ) {

		this.name = name;
		this.type = type;
		this.code = code;

		Object.defineProperty( this, 'isNodeCode', { value: true } );

	}

}

class NodeKeywords {

	constructor() {

		this.keywords = [];
		this.nodes = {};
		this.keywordsCallback = {};

	}

	getNode( name ) {

		let node = this.nodes[ name ];

		if ( node === undefined && this.keywordsCallback[ name ] !== undefined ) {

			node = this.keywordsCallback[ name ]( name );

			this.nodes[ name ] = node;

		}

		return node;

	}

	addKeyword( name, callback ) {

		this.keywords.push( name );
		this.keywordsCallback[ name ] = callback;

		return this;

	}

	parse( code ) {

		const keywordNames = this.keywords;

		const regExp = new RegExp( `\\b${keywordNames.join( '\\b|\\b' )}\\b`, 'g' );

		const codeKeywords = code.match( regExp );

		const keywordNodes = [];

		if ( codeKeywords !== null ) {

			for ( const keyword of codeKeywords ) {

				const node = this.getNode( keyword );

				if ( node !== undefined && keywordNodes.indexOf( node ) === - 1 ) {

					keywordNodes.push( node );

				}

			}

		}

		return keywordNodes;

	}

	include( builder, code ) {

		const keywordNodes = this.parse( code );

		for ( const keywordNode of keywordNodes ) {

			keywordNode.build( builder );

		}

	}

}

let id$3 = 0;

class NodeCache {

	constructor( parent = null ) {

		this.id = id$3 ++;
		this.nodesData = new WeakMap();

		this.parent = parent;

	}

	getData( node ) {

		let data = this.nodesData.get( node );

		if ( data === undefined && this.parent !== null ) {

			data = this.parent.getData( node );

		}

		return data;

	}

	setData( node, data ) {

		this.nodesData.set( node, data );

	}

}

class PropertyNode extends Node {

	constructor( nodeType, name = null, varying = false ) {

		super( nodeType );

		this.name = name;
		this.varying = varying;

		this.isPropertyNode = true;

	}

	getHash( builder ) {

		return this.name || super.getHash( builder );

	}

	isGlobal( /*builder*/ ) {

		return true;

	}

	generate( builder ) {

		let nodeVar;

		if ( this.varying === true ) {

			nodeVar = builder.getVaryingFromNode( this, this.name );
			nodeVar.needsInterpolation = true;

		} else {

			nodeVar = builder.getVarFromNode( this, this.name );

		}

		return builder.getPropertyName( nodeVar );

	}

}

const property = ( type, name ) => nodeObject( new PropertyNode( type, name ) );
const varyingProperty = ( type, name ) => nodeObject( new PropertyNode( type, name, true ) );

const diffuseColor = nodeImmutable( PropertyNode, 'vec4', 'DiffuseColor' );
const roughness = nodeImmutable( PropertyNode, 'float', 'Roughness' );
const metalness = nodeImmutable( PropertyNode, 'float', 'Metalness' );
const clearcoat = nodeImmutable( PropertyNode, 'float', 'Clearcoat' );
const clearcoatRoughness = nodeImmutable( PropertyNode, 'float', 'ClearcoatRoughness' );
const sheen = nodeImmutable( PropertyNode, 'vec3', 'Sheen' );
const sheenRoughness = nodeImmutable( PropertyNode, 'float', 'SheenRoughness' );
const iridescence = nodeImmutable( PropertyNode, 'float', 'Iridescence' );
const iridescenceIOR = nodeImmutable( PropertyNode, 'float', 'IridescenceIOR' );
const iridescenceThickness = nodeImmutable( PropertyNode, 'float', 'IridescenceThickness' );
const alphaT = nodeImmutable( PropertyNode, 'float', 'AlphaT' );
const anisotropy = nodeImmutable( PropertyNode, 'float', 'Anisotropy' );
const anisotropyT = nodeImmutable( PropertyNode, 'vec3', 'AnisotropyT' );
const anisotropyB = nodeImmutable( PropertyNode, 'vec3', 'AnisotropyB' );
const specularColor = nodeImmutable( PropertyNode, 'color', 'SpecularColor' );
const specularF90 = nodeImmutable( PropertyNode, 'float', 'SpecularF90' );
const shininess = nodeImmutable( PropertyNode, 'float', 'Shininess' );
const output = nodeImmutable( PropertyNode, 'vec4', 'Output' );
const dashSize = nodeImmutable( PropertyNode, 'float', 'dashSize' );
const gapSize = nodeImmutable( PropertyNode, 'float', 'gapSize' );
const pointWidth = nodeImmutable( PropertyNode, 'float', 'pointWidth' );
const ior = nodeImmutable( PropertyNode, 'float', 'IOR' );
const transmission = nodeImmutable( PropertyNode, 'float', 'Transmission' );
const thickness = nodeImmutable( PropertyNode, 'float', 'Thickness' );
const attenuationDistance = nodeImmutable( PropertyNode, 'float', 'AttenuationDistance' );
const attenuationColor = nodeImmutable( PropertyNode, 'color', 'AttenuationColor' );
const dispersion = nodeImmutable( PropertyNode, 'float', 'Dispersion' );

addNodeClass( 'PropertyNode', PropertyNode );

class ParameterNode extends PropertyNode {

	constructor( nodeType, name = null ) {

		super( nodeType, name );

		this.isParameterNode = true;

	}

	getHash() {

		return this.uuid;

	}

	generate() {

		return this.name;

	}

}

const parameter = ( type, name ) => nodeObject( new ParameterNode( type, name ) );

addNodeClass( 'ParameterNode', ParameterNode );

class CodeNode extends Node {

	constructor( code = '', includes = [], language = '' ) {

		super( 'code' );

		this.isCodeNode = true;

		this.code = code;
		this.language = language;

		this.includes = includes;

	}

	isGlobal() {

		return true;

	}

	setIncludes( includes ) {

		this.includes = includes;

		return this;

	}

	getIncludes( /*builder*/ ) {

		return this.includes;

	}

	generate( builder ) {

		const includes = this.getIncludes( builder );

		for ( const include of includes ) {

			include.build( builder );

		}

		const nodeCode = builder.getCodeFromNode( this, this.getNodeType( builder ) );
		nodeCode.code = this.code;

		return nodeCode.code;

	}

	serialize( data ) {

		super.serialize( data );

		data.code = this.code;
		data.language = this.language;

	}

	deserialize( data ) {

		super.deserialize( data );

		this.code = data.code;
		this.language = data.language;

	}

}

const code = nodeProxy( CodeNode );

const js = ( src, includes ) => code( src, includes, 'js' );
const wgsl = ( src, includes ) => code( src, includes, 'wgsl' );
const glsl = ( src, includes ) => code( src, includes, 'glsl' );

addNodeClass( 'CodeNode', CodeNode );

class FunctionNode extends CodeNode {

	constructor( code = '', includes = [], language = '' ) {

		super( code, includes, language );

		this.keywords = {};

	}

	getNodeType( builder ) {

		return this.getNodeFunction( builder ).type;

	}

	getInputs( builder ) {

		return this.getNodeFunction( builder ).inputs;

	}

	getNodeFunction( builder ) {

		const nodeData = builder.getDataFromNode( this );

		let nodeFunction = nodeData.nodeFunction;

		if ( nodeFunction === undefined ) {

			nodeFunction = builder.parser.parseFunction( this.code );

			nodeData.nodeFunction = nodeFunction;

		}

		return nodeFunction;

	}

	generate( builder, output ) {

		super.generate( builder );

		const nodeFunction = this.getNodeFunction( builder );

		const name = nodeFunction.name;
		const type = nodeFunction.type;

		const nodeCode = builder.getCodeFromNode( this, type );

		if ( name !== '' ) {

			// use a custom property name

			nodeCode.name = name;

		}

		const propertyName = builder.getPropertyName( nodeCode );

		let code = this.getNodeFunction( builder ).getCode( propertyName );

		const keywords = this.keywords;
		const keywordsProperties = Object.keys( keywords );

		if ( keywordsProperties.length > 0 ) {

			for ( const property of keywordsProperties ) {

				const propertyRegExp = new RegExp( `\\b${property}\\b`, 'g' );
				const nodeProperty = keywords[ property ].build( builder, 'property' );

				code = code.replace( propertyRegExp, nodeProperty );

			}

		}

		nodeCode.code = code + '\n';

		if ( output === 'property' ) {

			return propertyName;

		} else {

			return builder.format( `${ propertyName }()`, type, output );

		}

	}

}

const nativeFn = ( code, includes = [], language = '' ) => {

	for ( let i = 0; i < includes.length; i ++ ) {

		const include = includes[ i ];

		// TSL Function: glslFn, wgslFn

		if ( typeof include === 'function' ) {

			includes[ i ] = include.functionNode;

		}

	}

	const functionNode = nodeObject( new FunctionNode( code, includes, language ) );

	const fn = ( ...params ) => functionNode.call( ...params );
	fn.functionNode = functionNode;

	return fn;

};

const glslFn = ( code, includes ) => nativeFn( code, includes, 'glsl' );
const wgslFn = ( code, includes ) => nativeFn( code, includes, 'wgsl' );

addNodeClass( 'FunctionNode', FunctionNode );

class UniformGroupNode extends Node {

	constructor( name, shared = false ) {

		super( 'string' );

		this.name = name;
		this.version = 0;

		this.shared = shared;

		this.isUniformGroup = true;

	}

	set needsUpdate( value ) {

		if ( value === true ) this.version ++;

	}

}

const uniformGroup = ( name ) => new UniformGroupNode( name );
const sharedUniformGroup = ( name ) => new UniformGroupNode( name, true );

const frameGroup = sharedUniformGroup( 'frame' );
const renderGroup = sharedUniformGroup( 'render' );
const objectGroup = uniformGroup( 'object' );

addNodeClass( 'UniformGroupNode', UniformGroupNode );

class UniformNode extends InputNode {

	constructor( value, nodeType = null ) {

		super( value, nodeType );

		this.isUniformNode = true;

		this.name = '';
		this.groupNode = objectGroup;

	}

	label( name ) {

		this.name = name;

		return this;

	}

	setGroup( group ) {

		this.groupNode = group;

		return this;

	}

	getGroup() {

		return this.groupNode;

	}

	getUniformHash( builder ) {

		return this.getHash( builder );

	}

	onUpdate( callback, updateType ) {

		const self = this.getSelf();

		callback = callback.bind( self );

		return super.onUpdate( ( frame ) => {

			const value = callback( frame, self );

			if ( value !== undefined ) {

				this.value = value;

			}

	 	}, updateType );

	}

	generate( builder, output ) {

		const type = this.getNodeType( builder );

		const hash = this.getUniformHash( builder );

		let sharedNode = builder.getNodeFromHash( hash );

		if ( sharedNode === undefined ) {

			builder.setHashNode( this, hash );

			sharedNode = this;

		}

		const sharedNodeType = sharedNode.getInputType( builder );

		const nodeUniform = builder.getUniformFromNode( sharedNode, sharedNodeType, builder.shaderStage, this.name || builder.context.label );
		const propertyName = builder.getPropertyName( nodeUniform );

		if ( builder.context.label !== undefined ) delete builder.context.label;

		return builder.format( propertyName, type, output );

	}

}

const uniform = ( arg1, arg2 ) => {

	const nodeType = getConstNodeType( arg2 || arg1 );

	// @TODO: get ConstNode from .traverse() in the future
	const value = ( arg1 && arg1.isNode === true ) ? ( arg1.node && arg1.node.value ) || arg1.value : arg1;

	return nodeObject( new UniformNode( value, nodeType ) );

};

addNodeClass( 'UniformNode', UniformNode );

const uv = ( index ) => attribute( 'uv' + ( index > 0 ? index : '' ), 'vec2' );

class TextureSizeNode extends Node {

	constructor( textureNode, levelNode = null ) {

		super( 'uvec2' );

		this.isTextureSizeNode = true;

		this.textureNode = textureNode;
		this.levelNode = levelNode;

	}

	generate( builder, output ) {

		const textureProperty = this.textureNode.build( builder, 'property' );
		const levelNode = this.levelNode.build( builder, 'int' );

		return builder.format( `${ builder.getMethod( 'textureDimensions' ) }( ${ textureProperty }, ${ levelNode } )`, this.getNodeType( builder ), output );

	}

}

const textureSize = nodeProxy( TextureSizeNode );

addNodeElement( 'textureSize', textureSize );

addNodeClass( 'TextureSizeNode', TextureSizeNode );

class OperatorNode extends TempNode {

	constructor( op, aNode, bNode, ...params ) {

		super();

		if ( params.length > 0 ) {

			let finalOp = new OperatorNode( op, aNode, bNode );

			for ( let i = 0; i < params.length - 1; i ++ ) {

				finalOp = new OperatorNode( op, finalOp, params[ i ] );

			}

			aNode = finalOp;
			bNode = params[ params.length - 1 ];

		}

		this.op = op;
		this.aNode = aNode;
		this.bNode = bNode;

	}

	getNodeType( builder, output ) {

		const op = this.op;

		const aNode = this.aNode;
		const bNode = this.bNode;

		const typeA = aNode.getNodeType( builder );
		const typeB = typeof bNode !== 'undefined' ? bNode.getNodeType( builder ) : null;

		if ( typeA === 'void' || typeB === 'void' ) {

			return 'void';

		} else if ( op === '%' ) {

			return typeA;

		} else if ( op === '~' || op === '&' || op === '|' || op === '^' || op === '>>' || op === '<<' ) {

			return builder.getIntegerType( typeA );

		} else if ( op === '!' || op === '==' || op === '&&' || op === '||' || op === '^^' ) {

			return 'bool';

		} else if ( op === '<' || op === '>' || op === '<=' || op === '>=' ) {

			const typeLength = output ? builder.getTypeLength( output ) : Math.max( builder.getTypeLength( typeA ), builder.getTypeLength( typeB ) );

			return typeLength > 1 ? `bvec${ typeLength }` : 'bool';

		} else {

			if ( typeA === 'float' && builder.isMatrix( typeB ) ) {

				return typeB;

			} else if ( builder.isMatrix( typeA ) && builder.isVector( typeB ) ) {

				// matrix x vector

				return builder.getVectorFromMatrix( typeA );

			} else if ( builder.isVector( typeA ) && builder.isMatrix( typeB ) ) {

				// vector x matrix

				return builder.getVectorFromMatrix( typeB );

			} else if ( builder.getTypeLength( typeB ) > builder.getTypeLength( typeA ) ) {

				// anytype x anytype: use the greater length vector

				return typeB;

			}

			return typeA;

		}

	}

	generate( builder, output ) {

		const op = this.op;

		const aNode = this.aNode;
		const bNode = this.bNode;

		const type = this.getNodeType( builder, output );

		let typeA = null;
		let typeB = null;

		if ( type !== 'void' ) {

			typeA = aNode.getNodeType( builder );
			typeB = typeof bNode !== 'undefined' ? bNode.getNodeType( builder ) : null;

			if ( op === '<' || op === '>' || op === '<=' || op === '>=' || op === '==' ) {

				if ( builder.isVector( typeA ) ) {

					typeB = typeA;

				} else {

					typeA = typeB = 'float';

				}

			} else if ( op === '>>' || op === '<<' ) {

				typeA = type;
				typeB = builder.changeComponentType( typeB, 'uint' );

			} else if ( builder.isMatrix( typeA ) && builder.isVector( typeB ) ) {

				// matrix x vector

				typeB = builder.getVectorFromMatrix( typeA );

			} else if ( builder.isVector( typeA ) && builder.isMatrix( typeB ) ) {

				// vector x matrix

				typeA = builder.getVectorFromMatrix( typeB );

			} else {

				// anytype x anytype

				typeA = typeB = type;

			}

		} else {

			typeA = typeB = type;

		}

		const a = aNode.build( builder, typeA );
		const b = typeof bNode !== 'undefined' ? bNode.build( builder, typeB ) : null;

		const outputLength = builder.getTypeLength( output );
		const fnOpSnippet = builder.getFunctionOperator( op );

		if ( output !== 'void' ) {

			if ( op === '<' && outputLength > 1 ) {

				return builder.format( `${ builder.getMethod( 'lessThan' ) }( ${ a }, ${ b } )`, type, output );

			} else if ( op === '<=' && outputLength > 1 ) {

				return builder.format( `${ builder.getMethod( 'lessThanEqual' ) }( ${ a }, ${ b } )`, type, output );

			} else if ( op === '>' && outputLength > 1 ) {

				return builder.format( `${ builder.getMethod( 'greaterThan' ) }( ${ a }, ${ b } )`, type, output );

			} else if ( op === '>=' && outputLength > 1 ) {

				return builder.format( `${ builder.getMethod( 'greaterThanEqual' ) }( ${ a }, ${ b } )`, type, output );

			} else if ( op === '!' || op === '~' ) {

				return builder.format( `(${op}${a})`, typeA, output );

			} else if ( fnOpSnippet ) {

				return builder.format( `${ fnOpSnippet }( ${ a }, ${ b } )`, type, output );

			} else {

				return builder.format( `( ${ a } ${ op } ${ b } )`, type, output );

			}

		} else if ( typeA !== 'void' ) {

			if ( fnOpSnippet ) {

				return builder.format( `${ fnOpSnippet }( ${ a }, ${ b } )`, type, output );

			} else {

				return builder.format( `${ a } ${ op } ${ b }`, type, output );

			}

		}

	}

	serialize( data ) {

		super.serialize( data );

		data.op = this.op;

	}

	deserialize( data ) {

		super.deserialize( data );

		this.op = data.op;

	}

}

const add = nodeProxy( OperatorNode, '+' );
const sub = nodeProxy( OperatorNode, '-' );
const mul = nodeProxy( OperatorNode, '*' );
const div = nodeProxy( OperatorNode, '/' );
const remainder = nodeProxy( OperatorNode, '%' );
const equal = nodeProxy( OperatorNode, '==' );
const notEqual = nodeProxy( OperatorNode, '!=' );
const lessThan = nodeProxy( OperatorNode, '<' );
const greaterThan = nodeProxy( OperatorNode, '>' );
const lessThanEqual = nodeProxy( OperatorNode, '<=' );
const greaterThanEqual = nodeProxy( OperatorNode, '>=' );
const and = nodeProxy( OperatorNode, '&&' );
const or = nodeProxy( OperatorNode, '||' );
const not = nodeProxy( OperatorNode, '!' );
const xor = nodeProxy( OperatorNode, '^^' );
const bitAnd = nodeProxy( OperatorNode, '&' );
const bitNot = nodeProxy( OperatorNode, '~' );
const bitOr = nodeProxy( OperatorNode, '|' );
const bitXor = nodeProxy( OperatorNode, '^' );
const shiftLeft = nodeProxy( OperatorNode, '<<' );
const shiftRight = nodeProxy( OperatorNode, '>>' );

addNodeElement( 'add', add );
addNodeElement( 'sub', sub );
addNodeElement( 'mul', mul );
addNodeElement( 'div', div );
addNodeElement( 'remainder', remainder );
addNodeElement( 'equal', equal );
addNodeElement( 'notEqual', notEqual );
addNodeElement( 'lessThan', lessThan );
addNodeElement( 'greaterThan', greaterThan );
addNodeElement( 'lessThanEqual', lessThanEqual );
addNodeElement( 'greaterThanEqual', greaterThanEqual );
addNodeElement( 'and', and );
addNodeElement( 'or', or );
addNodeElement( 'not', not );
addNodeElement( 'xor', xor );
addNodeElement( 'bitAnd', bitAnd );
addNodeElement( 'bitNot', bitNot );
addNodeElement( 'bitOr', bitOr );
addNodeElement( 'bitXor', bitXor );
addNodeElement( 'shiftLeft', shiftLeft );
addNodeElement( 'shiftRight', shiftRight );

addNodeClass( 'OperatorNode', OperatorNode );

class MathNode extends TempNode {

	constructor( method, aNode, bNode = null, cNode = null ) {

		super();

		this.method = method;

		this.aNode = aNode;
		this.bNode = bNode;
		this.cNode = cNode;

	}

	getInputType( builder ) {

		const aType = this.aNode.getNodeType( builder );
		const bType = this.bNode ? this.bNode.getNodeType( builder ) : null;
		const cType = this.cNode ? this.cNode.getNodeType( builder ) : null;

		const aLen = builder.isMatrix( aType ) ? 0 : builder.getTypeLength( aType );
		const bLen = builder.isMatrix( bType ) ? 0 : builder.getTypeLength( bType );
		const cLen = builder.isMatrix( cType ) ? 0 : builder.getTypeLength( cType );

		if ( aLen > bLen && aLen > cLen ) {

			return aType;

		} else if ( bLen > cLen ) {

			return bType;

		} else if ( cLen > aLen ) {

			return cType;

		}

		return aType;

	}

	getNodeType( builder ) {

		const method = this.method;

		if ( method === MathNode.LENGTH || method === MathNode.DISTANCE || method === MathNode.DOT ) {

			return 'float';

		} else if ( method === MathNode.CROSS ) {

			return 'vec3';

		} else if ( method === MathNode.ALL ) {

			return 'bool';

		} else if ( method === MathNode.EQUALS ) {

			return builder.changeComponentType( this.aNode.getNodeType( builder ), 'bool' );

		} else if ( method === MathNode.MOD ) {

			return this.aNode.getNodeType( builder );

		} else {

			return this.getInputType( builder );

		}

	}

	generate( builder, output ) {

		const method = this.method;

		const type = this.getNodeType( builder );
		const inputType = this.getInputType( builder );

		const a = this.aNode;
		const b = this.bNode;
		const c = this.cNode;

		const isWebGL = builder.renderer.isWebGLRenderer === true;

		if ( method === MathNode.TRANSFORM_DIRECTION ) {

			// dir can be either a direction vector or a normal vector
			// upper-left 3x3 of matrix is assumed to be orthogonal

			let tA = a;
			let tB = b;

			if ( builder.isMatrix( tA.getNodeType( builder ) ) ) {

				tB = vec4( vec3( tB ), 0.0 );

			} else {

				tA = vec4( vec3( tA ), 0.0 );

			}

			const mulNode = mul( tA, tB ).xyz;

			return normalize( mulNode ).build( builder, output );

		} else if ( method === MathNode.NEGATE ) {

			return builder.format( '( - ' + a.build( builder, inputType ) + ' )', type, output );

		} else if ( method === MathNode.ONE_MINUS ) {

			return sub( 1.0, a ).build( builder, output );

		} else if ( method === MathNode.RECIPROCAL ) {

			return div( 1.0, a ).build( builder, output );

		} else if ( method === MathNode.DIFFERENCE ) {

			return abs( sub( a, b ) ).build( builder, output );

		} else {

			const params = [];

			if ( method === MathNode.CROSS || method === MathNode.MOD ) {

				params.push(
					a.build( builder, type ),
					b.build( builder, type )
				);

			} else if ( method === MathNode.STEP ) {

				params.push(
					a.build( builder, builder.getTypeLength( a.getNodeType( builder ) ) === 1 ? 'float' : inputType ),
					b.build( builder, inputType )
				);

			} else if ( ( isWebGL && ( method === MathNode.MIN || method === MathNode.MAX ) ) || method === MathNode.MOD ) {

				params.push(
					a.build( builder, inputType ),
					b.build( builder, builder.getTypeLength( b.getNodeType( builder ) ) === 1 ? 'float' : inputType )
				);

			} else if ( method === MathNode.REFRACT ) {

				params.push(
					a.build( builder, inputType ),
					b.build( builder, inputType ),
					c.build( builder, 'float' )
				);

			} else if ( method === MathNode.MIX ) {

				params.push(
					a.build( builder, inputType ),
					b.build( builder, inputType ),
					c.build( builder, builder.getTypeLength( c.getNodeType( builder ) ) === 1 ? 'float' : inputType )
				);

			} else {

				params.push( a.build( builder, inputType ) );
				if ( b !== null ) params.push( b.build( builder, inputType ) );
				if ( c !== null ) params.push( c.build( builder, inputType ) );

			}

			return builder.format( `${ builder.getMethod( method, type ) }( ${params.join( ', ' )} )`, type, output );

		}

	}

	serialize( data ) {

		super.serialize( data );

		data.method = this.method;

	}

	deserialize( data ) {

		super.deserialize( data );

		this.method = data.method;

	}

}

// 1 input

MathNode.ALL = 'all';
MathNode.ANY = 'any';
MathNode.EQUALS = 'equals';

MathNode.RADIANS = 'radians';
MathNode.DEGREES = 'degrees';
MathNode.EXP = 'exp';
MathNode.EXP2 = 'exp2';
MathNode.LOG = 'log';
MathNode.LOG2 = 'log2';
MathNode.SQRT = 'sqrt';
MathNode.INVERSE_SQRT = 'inversesqrt';
MathNode.FLOOR = 'floor';
MathNode.CEIL = 'ceil';
MathNode.NORMALIZE = 'normalize';
MathNode.FRACT = 'fract';
MathNode.SIN = 'sin';
MathNode.COS = 'cos';
MathNode.TAN = 'tan';
MathNode.ASIN = 'asin';
MathNode.ACOS = 'acos';
MathNode.ATAN = 'atan';
MathNode.ABS = 'abs';
MathNode.SIGN = 'sign';
MathNode.LENGTH = 'length';
MathNode.NEGATE = 'negate';
MathNode.ONE_MINUS = 'oneMinus';
MathNode.DFDX = 'dFdx';
MathNode.DFDY = 'dFdy';
MathNode.ROUND = 'round';
MathNode.RECIPROCAL = 'reciprocal';
MathNode.TRUNC = 'trunc';
MathNode.FWIDTH = 'fwidth';
MathNode.BITCAST = 'bitcast';
MathNode.TRANSPOSE = 'transpose';

// 2 inputs

MathNode.ATAN2 = 'atan2';
MathNode.MIN = 'min';
MathNode.MAX = 'max';
MathNode.MOD = 'mod';
MathNode.STEP = 'step';
MathNode.REFLECT = 'reflect';
MathNode.DISTANCE = 'distance';
MathNode.DIFFERENCE = 'difference';
MathNode.DOT = 'dot';
MathNode.CROSS = 'cross';
MathNode.POW = 'pow';
MathNode.TRANSFORM_DIRECTION = 'transformDirection';

// 3 inputs

MathNode.MIX = 'mix';
MathNode.CLAMP = 'clamp';
MathNode.REFRACT = 'refract';
MathNode.SMOOTHSTEP = 'smoothstep';
MathNode.FACEFORWARD = 'faceforward';

const EPSILON = float( 1e-6 );
const INFINITY = float( 1e6 );
const PI = float( Math.PI );
const PI2 = float( Math.PI * 2 );

const all = nodeProxy( MathNode, MathNode.ALL );
const any = nodeProxy( MathNode, MathNode.ANY );
const equals = nodeProxy( MathNode, MathNode.EQUALS );

const radians = nodeProxy( MathNode, MathNode.RADIANS );
const degrees = nodeProxy( MathNode, MathNode.DEGREES );
const exp = nodeProxy( MathNode, MathNode.EXP );
const exp2 = nodeProxy( MathNode, MathNode.EXP2 );
const log = nodeProxy( MathNode, MathNode.LOG );
const log2 = nodeProxy( MathNode, MathNode.LOG2 );
const sqrt = nodeProxy( MathNode, MathNode.SQRT );
const inverseSqrt = nodeProxy( MathNode, MathNode.INVERSE_SQRT );
const floor = nodeProxy( MathNode, MathNode.FLOOR );
const ceil = nodeProxy( MathNode, MathNode.CEIL );
const normalize = nodeProxy( MathNode, MathNode.NORMALIZE );
const fract = nodeProxy( MathNode, MathNode.FRACT );
const sin = nodeProxy( MathNode, MathNode.SIN );
const cos = nodeProxy( MathNode, MathNode.COS );
const tan = nodeProxy( MathNode, MathNode.TAN );
const asin = nodeProxy( MathNode, MathNode.ASIN );
const acos = nodeProxy( MathNode, MathNode.ACOS );
const atan = nodeProxy( MathNode, MathNode.ATAN );
const abs = nodeProxy( MathNode, MathNode.ABS );
const sign = nodeProxy( MathNode, MathNode.SIGN );
const length = nodeProxy( MathNode, MathNode.LENGTH );
const negate = nodeProxy( MathNode, MathNode.NEGATE );
const oneMinus = nodeProxy( MathNode, MathNode.ONE_MINUS );
const dFdx = nodeProxy( MathNode, MathNode.DFDX );
const dFdy = nodeProxy( MathNode, MathNode.DFDY );
const round = nodeProxy( MathNode, MathNode.ROUND );
const reciprocal = nodeProxy( MathNode, MathNode.RECIPROCAL );
const trunc = nodeProxy( MathNode, MathNode.TRUNC );
const fwidth = nodeProxy( MathNode, MathNode.FWIDTH );
const bitcast = nodeProxy( MathNode, MathNode.BITCAST );
const transpose = nodeProxy( MathNode, MathNode.TRANSPOSE );

const atan2 = nodeProxy( MathNode, MathNode.ATAN2 );
const min$1 = nodeProxy( MathNode, MathNode.MIN );
const max$1 = nodeProxy( MathNode, MathNode.MAX );
const mod = nodeProxy( MathNode, MathNode.MOD );
const step = nodeProxy( MathNode, MathNode.STEP );
const reflect = nodeProxy( MathNode, MathNode.REFLECT );
const distance = nodeProxy( MathNode, MathNode.DISTANCE );
const difference = nodeProxy( MathNode, MathNode.DIFFERENCE );
const dot = nodeProxy( MathNode, MathNode.DOT );
const cross = nodeProxy( MathNode, MathNode.CROSS );
const pow = nodeProxy( MathNode, MathNode.POW );
const pow2 = nodeProxy( MathNode, MathNode.POW, 2 );
const pow3 = nodeProxy( MathNode, MathNode.POW, 3 );
const pow4 = nodeProxy( MathNode, MathNode.POW, 4 );
const transformDirection = nodeProxy( MathNode, MathNode.TRANSFORM_DIRECTION );

const cbrt = ( a ) => mul( sign( a ), pow( abs( a ), 1.0 / 3.0 ) );
const lengthSq = ( a ) => dot( a, a );
const mix = nodeProxy( MathNode, MathNode.MIX );
const clamp = ( value, low = 0, high = 1 ) => nodeObject( new MathNode( MathNode.CLAMP, nodeObject( value ), nodeObject( low ), nodeObject( high ) ) );
const saturate = ( value ) => clamp( value );
const refract = nodeProxy( MathNode, MathNode.REFRACT );
const smoothstep = nodeProxy( MathNode, MathNode.SMOOTHSTEP );
const faceForward = nodeProxy( MathNode, MathNode.FACEFORWARD );

const rand = tslFn( ( [ uv ] ) => {

	const a = 12.9898, b = 78.233, c = 43758.5453;
	const dt = dot( uv.xy, vec2( a, b ) ), sn = mod( dt, PI );

	return fract( sin( sn ).mul( c ) );

} );

const mixElement = ( t, e1, e2 ) => mix( e1, e2, t );
const smoothstepElement = ( x, low, high ) => smoothstep( low, high, x );

addNodeElement( 'all', all );
addNodeElement( 'any', any );
addNodeElement( 'equals', equals );

addNodeElement( 'radians', radians );
addNodeElement( 'degrees', degrees );
addNodeElement( 'exp', exp );
addNodeElement( 'exp2', exp2 );
addNodeElement( 'log', log );
addNodeElement( 'log2', log2 );
addNodeElement( 'sqrt', sqrt );
addNodeElement( 'inverseSqrt', inverseSqrt );
addNodeElement( 'floor', floor );
addNodeElement( 'ceil', ceil );
addNodeElement( 'normalize', normalize );
addNodeElement( 'fract', fract );
addNodeElement( 'sin', sin );
addNodeElement( 'cos', cos );
addNodeElement( 'tan', tan );
addNodeElement( 'asin', asin );
addNodeElement( 'acos', acos );
addNodeElement( 'atan', atan );
addNodeElement( 'abs', abs );
addNodeElement( 'sign', sign );
addNodeElement( 'length', length );
addNodeElement( 'lengthSq', lengthSq );
addNodeElement( 'negate', negate );
addNodeElement( 'oneMinus', oneMinus );
addNodeElement( 'dFdx', dFdx );
addNodeElement( 'dFdy', dFdy );
addNodeElement( 'round', round );
addNodeElement( 'reciprocal', reciprocal );
addNodeElement( 'trunc', trunc );
addNodeElement( 'fwidth', fwidth );
addNodeElement( 'atan2', atan2 );
addNodeElement( 'min', min$1 );
addNodeElement( 'max', max$1 );
addNodeElement( 'mod', mod );
addNodeElement( 'step', step );
addNodeElement( 'reflect', reflect );
addNodeElement( 'distance', distance );
addNodeElement( 'dot', dot );
addNodeElement( 'cross', cross );
addNodeElement( 'pow', pow );
addNodeElement( 'pow2', pow2 );
addNodeElement( 'pow3', pow3 );
addNodeElement( 'pow4', pow4 );
addNodeElement( 'transformDirection', transformDirection );
addNodeElement( 'mix', mixElement );
addNodeElement( 'clamp', clamp );
addNodeElement( 'refract', refract );
addNodeElement( 'smoothstep', smoothstepElement );
addNodeElement( 'faceForward', faceForward );
addNodeElement( 'difference', difference );
addNodeElement( 'saturate', saturate );
addNodeElement( 'cbrt', cbrt );
addNodeElement( 'transpose', transpose );
addNodeElement( 'rand', rand );

addNodeClass( 'MathNode', MathNode );

const sRGBToLinearShader = tslFn( ( inputs ) => {

	const { value } = inputs;
	const { rgb } = value;

	const a = rgb.mul( 0.9478672986 ).add( 0.0521327014 ).pow( 2.4 );
	const b = rgb.mul( 0.0773993808 );
	const factor = rgb.lessThanEqual( 0.04045 );

	const rgbResult = mix( a, b, factor );

	return vec4( rgbResult, value.a );

} );

const LinearTosRGBShader = tslFn( ( inputs ) => {

	const { value } = inputs;
	const { rgb } = value;

	const a = rgb.pow( 0.41666 ).mul( 1.055 ).sub( 0.055 );
	const b = rgb.mul( 12.92 );
	const factor = rgb.lessThanEqual( 0.0031308 );

	const rgbResult = mix( a, b, factor );

	return vec4( rgbResult, value.a );

} );

const getColorSpaceMethod = ( colorSpace ) => {

	let method = null;

	if ( colorSpace === LinearSRGBColorSpace ) {

		method = 'Linear';

	} else if ( colorSpace === SRGBColorSpace ) {

		method = 'sRGB';

	}

	return method;

};

const getMethod = ( source, target ) => {

	return getColorSpaceMethod( source ) + 'To' + getColorSpaceMethod( target );

};

class ColorSpaceNode extends TempNode {

	constructor( method, node ) {

		super( 'vec4' );

		this.method = method;
		this.node = node;

	}

	setup() {

		const { method, node } = this;

		if ( method === ColorSpaceNode.LINEAR_TO_LINEAR )
			return node;

		return Methods[ method ]( { value: node } );

	}

}

ColorSpaceNode.LINEAR_TO_LINEAR = 'LinearToLinear';
ColorSpaceNode.LINEAR_TO_sRGB = 'LinearTosRGB';
ColorSpaceNode.sRGB_TO_LINEAR = 'sRGBToLinear';

const Methods = {
	[ ColorSpaceNode.LINEAR_TO_sRGB ]: LinearTosRGBShader,
	[ ColorSpaceNode.sRGB_TO_LINEAR ]: sRGBToLinearShader
};

const linearToColorSpace = ( node, colorSpace ) => nodeObject( new ColorSpaceNode( getMethod( LinearSRGBColorSpace, colorSpace ), nodeObject( node ) ) );
const colorSpaceToLinear = ( node, colorSpace ) => nodeObject( new ColorSpaceNode( getMethod( colorSpace, LinearSRGBColorSpace ), nodeObject( node ) ) );

const linearTosRGB = nodeProxy( ColorSpaceNode, ColorSpaceNode.LINEAR_TO_sRGB );
const sRGBToLinear = nodeProxy( ColorSpaceNode, ColorSpaceNode.sRGB_TO_LINEAR );

addNodeElement( 'linearTosRGB', linearTosRGB );
addNodeElement( 'sRGBToLinear', sRGBToLinear );
addNodeElement( 'linearToColorSpace', linearToColorSpace );
addNodeElement( 'colorSpaceToLinear', colorSpaceToLinear );

addNodeClass( 'ColorSpaceNode', ColorSpaceNode );

class ExpressionNode extends Node {

	constructor( snippet = '', nodeType = 'void' ) {

		super( nodeType );

		this.snippet = snippet;

	}

	generate( builder, output ) {

		const type = this.getNodeType( builder );
		const snippet = this.snippet;

		if ( type === 'void' ) {

			builder.addLineFlowCode( snippet );

		} else {

			return builder.format( `( ${ snippet } )`, type, output );

		}

	}

}

const expression = nodeProxy( ExpressionNode );

addNodeClass( 'ExpressionNode', ExpressionNode );

class MaxMipLevelNode extends UniformNode {

	constructor( textureNode ) {

		super( 0 );

		this._textureNode = textureNode;

		this.updateType = NodeUpdateType.FRAME;

	}

	get textureNode() {

		return this._textureNode;

	}

	get texture() {

		return this._textureNode.value;

	}

	update() {

		const texture = this.texture;
		const images = texture.images;
		const image = ( images && images.length > 0 ) ? ( ( images[ 0 ] && images[ 0 ].image ) || images[ 0 ] ) : texture.image;

		if ( image && image.width !== undefined ) {

			const { width, height } = image;

			this.value = Math.log2( Math.max( width, height ) );

		}

	}

}

const maxMipLevel = nodeProxy( MaxMipLevelNode );

addNodeClass( 'MaxMipLevelNode', MaxMipLevelNode );

class TextureNode extends UniformNode {

	constructor( value, uvNode = null, levelNode = null, biasNode = null ) {

		super( value );

		this.isTextureNode = true;

		this.uvNode = uvNode;
		this.levelNode = levelNode;
		this.biasNode = biasNode;
		this.compareNode = null;
		this.depthNode = null;
		this.gradNode = null;

		this.sampler = true;
		this.updateMatrix = false;
		this.updateType = NodeUpdateType.NONE;

		this.referenceNode = null;

		this._value = value;
		this._matrixUniform = null;

		this.setUpdateMatrix( uvNode === null );

	}

	set value( value ) {

		if ( this.referenceNode ) {

			this.referenceNode.value = value;

		} else {

			this._value = value;

		}

	}

	get value() {

		return this.referenceNode ? this.referenceNode.value : this._value;

	}

	getUniformHash( /*builder*/ ) {

		return this.value.uuid;

	}

	getNodeType( /*builder*/ ) {

		if ( this.value.isDepthTexture === true ) return 'float';

		if ( this.value.type === UnsignedIntType ) {

			return 'uvec4';

		} else if ( this.value.type === IntType ) {

			return 'ivec4';

		}

		return 'vec4';

	}

	getInputType( /*builder*/ ) {

		return 'texture';

	}

	getDefaultUV() {

		return uv( this.value.channel );

	}

	updateReference( /*state*/ ) {

		return this.value;

	}

	getTransformedUV( uvNode ) {

		if ( this._matrixUniform === null ) this._matrixUniform = uniform( this.value.matrix );

		return this._matrixUniform.mul( vec3( uvNode, 1 ) ).xy;


	}

	setUpdateMatrix( value ) {

		this.updateMatrix = value;
		this.updateType = value ? NodeUpdateType.FRAME : NodeUpdateType.NONE;

		return this;

	}

	setupUV( builder, uvNode ) {

		const texture = this.value;

		if ( builder.isFlipY() && ( texture.isRenderTargetTexture === true || texture.isFramebufferTexture === true || texture.isDepthTexture === true ) ) {

			uvNode = uvNode.setY( uvNode.y.oneMinus() );

		}

		return uvNode;

	}

	setup( builder ) {

		const properties = builder.getNodeProperties( this );
		properties.referenceNode = this.referenceNode;

		//

		let uvNode = this.uvNode;

		if ( ( uvNode === null || builder.context.forceUVContext === true ) && builder.context.getUV ) {

			uvNode = builder.context.getUV( this );

		}

		if ( ! uvNode ) uvNode = this.getDefaultUV();

		if ( this.updateMatrix === true ) {

			uvNode = this.getTransformedUV( uvNode );

		}

		uvNode = this.setupUV( builder, uvNode );

		//

		let levelNode = this.levelNode;

		if ( levelNode === null && builder.context.getTextureLevel ) {

			levelNode = builder.context.getTextureLevel( this );

		}

		//

		properties.uvNode = uvNode;
		properties.levelNode = levelNode;
		properties.biasNode = this.biasNode;
		properties.compareNode = this.compareNode;
		properties.gradNode = this.gradNode;
		properties.depthNode = this.depthNode;

	}

	generateUV( builder, uvNode ) {

		return uvNode.build( builder, this.sampler === true ? 'vec2' : 'ivec2' );

	}

	generateSnippet( builder, textureProperty, uvSnippet, levelSnippet, biasSnippet, depthSnippet, compareSnippet, gradSnippet ) {

		const texture = this.value;

		let snippet;

		if ( levelSnippet ) {

			snippet = builder.generateTextureLevel( texture, textureProperty, uvSnippet, levelSnippet, depthSnippet );

		} else if ( biasSnippet ) {

			snippet = builder.generateTextureBias( texture, textureProperty, uvSnippet, biasSnippet, depthSnippet );

		} else if ( gradSnippet ) {

			snippet = builder.generateTextureGrad( texture, textureProperty, uvSnippet, gradSnippet, depthSnippet );

		} else if ( compareSnippet ) {

			snippet = builder.generateTextureCompare( texture, textureProperty, uvSnippet, compareSnippet, depthSnippet );

		} else if ( this.sampler === false ) {

			snippet = builder.generateTextureLoad( texture, textureProperty, uvSnippet, depthSnippet );

		} else {

			snippet = builder.generateTexture( texture, textureProperty, uvSnippet, depthSnippet );

		}

		return snippet;

	}

	generate( builder, output ) {

		const properties = builder.getNodeProperties( this );

		const texture = this.value;

		if ( ! texture || texture.isTexture !== true ) {

			throw new Error( 'TextureNode: Need a three.js texture.' );

		}

		const textureProperty = super.generate( builder, 'property' );

		if ( output === 'sampler' ) {

			return textureProperty + '_sampler';

		} else if ( builder.isReference( output ) ) {

			return textureProperty;

		} else {

			const nodeData = builder.getDataFromNode( this );

			let propertyName = nodeData.propertyName;

			if ( propertyName === undefined ) {

				const { uvNode, levelNode, biasNode, compareNode, depthNode, gradNode } = properties;

				const uvSnippet = this.generateUV( builder, uvNode );
				const levelSnippet = levelNode ? levelNode.build( builder, 'float' ) : null;
				const biasSnippet = biasNode ? biasNode.build( builder, 'float' ) : null;
				const depthSnippet = depthNode ? depthNode.build( builder, 'int' ) : null;
				const compareSnippet = compareNode ? compareNode.build( builder, 'float' ) : null;
				const gradSnippet = gradNode ? [ gradNode[ 0 ].build( builder, 'vec2' ), gradNode[ 1 ].build( builder, 'vec2' ) ] : null;

				const nodeVar = builder.getVarFromNode( this );

				propertyName = builder.getPropertyName( nodeVar );

				const snippet = this.generateSnippet( builder, textureProperty, uvSnippet, levelSnippet, biasSnippet, depthSnippet, compareSnippet, gradSnippet );

				builder.addLineFlowCode( `${propertyName} = ${snippet}` );

				nodeData.snippet = snippet;
				nodeData.propertyName = propertyName;

			}

			let snippet = propertyName;
			const nodeType = this.getNodeType( builder );

			if ( builder.needsColorSpaceToLinear( texture ) ) {

				snippet = colorSpaceToLinear( expression( snippet, nodeType ), texture.colorSpace ).setup( builder ).build( builder, nodeType );

			}

			return builder.format( snippet, nodeType, output );

		}

	}

	setSampler( value ) {

		this.sampler = value;

		return this;

	}

	getSampler() {

		return this.sampler;

	}

	// @TODO: Move to TSL

	uv( uvNode ) {

		const textureNode = this.clone();
		textureNode.uvNode = nodeObject( uvNode );
		textureNode.referenceNode = this;

		return nodeObject( textureNode );

	}

	blur( amountNode ) {

		const textureNode = this.clone();
		textureNode.biasNode = nodeObject( amountNode ).mul( maxMipLevel( textureNode ) );
		textureNode.referenceNode = this;

		return nodeObject( textureNode );

	}

	level( levelNode ) {

		const textureNode = this.clone();
		textureNode.levelNode = nodeObject( levelNode );
		textureNode.referenceNode = this;

		return nodeObject( textureNode );

	}

	size( levelNode ) {

		return textureSize( this, levelNode );

	}

	bias( biasNode ) {

		const textureNode = this.clone();
		textureNode.biasNode = nodeObject( biasNode );
		textureNode.referenceNode = this;

		return nodeObject( textureNode );

	}

	compare( compareNode ) {

		const textureNode = this.clone();
		textureNode.compareNode = nodeObject( compareNode );
		textureNode.referenceNode = this;

		return nodeObject( textureNode );

	}

	grad( gradNodeX, gradNodeY ) {

		const textureNode = this.clone();
		textureNode.gradNode = [ nodeObject( gradNodeX ), nodeObject( gradNodeY ) ];

		textureNode.referenceNode = this;

		return nodeObject( textureNode );

	}

	depth( depthNode ) {

		const textureNode = this.clone();
		textureNode.depthNode = nodeObject( depthNode );
		textureNode.referenceNode = this;

		return nodeObject( textureNode );

	}

	// --

	serialize( data ) {

		super.serialize( data );

		data.value = this.value.toJSON( data.meta ).uuid;

	}

	deserialize( data ) {

		super.deserialize( data );

		this.value = data.meta.textures[ data.value ];

	}

	update() {

		const texture = this.value;
		const matrixUniform = this._matrixUniform;

		if ( matrixUniform !== null ) matrixUniform.value = texture.matrix;

		if ( texture.matrixAutoUpdate === true ) {

			texture.updateMatrix();

		}

	}

	clone() {

		const newNode = new this.constructor( this.value, this.uvNode, this.levelNode, this.biasNode );
		newNode.sampler = this.sampler;

		return newNode;

	}

}

const texture = nodeProxy( TextureNode );
const textureLoad = ( ...params ) => texture( ...params ).setSampler( false );

//export const textureLevel = ( value, uv, level ) => texture( value, uv ).level( level );

const sampler = ( aTexture ) => ( aTexture.isNode === true ? aTexture : texture( aTexture ) ).convert( 'sampler' );

addNodeElement( 'texture', texture );
//addNodeElement( 'textureLevel', textureLevel );

addNodeClass( 'TextureNode', TextureNode );

class BufferNode extends UniformNode {

	constructor( value, bufferType, bufferCount = 0 ) {

		super( value, bufferType );

		this.isBufferNode = true;

		this.bufferType = bufferType;
		this.bufferCount = bufferCount;

	}

	getElementType( builder ) {

		return this.getNodeType( builder );

	}

	getInputType( /*builder*/ ) {

		return 'buffer';

	}

}

const buffer = ( value, type, count ) => nodeObject( new BufferNode( value, type, count ) );

addNodeClass( 'BufferNode', BufferNode );

class UniformsElementNode extends ArrayElementNode {

	constructor( arrayBuffer, indexNode ) {

		super( arrayBuffer, indexNode );

		this.isArrayBufferElementNode = true;

	}

	getNodeType( builder ) {

		return this.node.getElementType( builder );

	}

	generate( builder ) {

		const snippet = super.generate( builder );
		const type = this.getNodeType();

		return builder.format( snippet, 'vec4', type );

	}

}

class UniformsNode extends BufferNode {

	constructor( value, elementType = null ) {

		super( null, 'vec4' );

		this.array = value;
		this.elementType = elementType;

		this._elementType = null;
		this._elementLength = 0;

		this.updateType = NodeUpdateType.RENDER;

		this.isArrayBufferNode = true;

	}

	getElementType() {

		return this.elementType || this._elementType;

	}

	getElementLength() {

		return this._elementLength;

	}

	update( /*frame*/ ) {

		const { array, value } = this;

		const elementLength = this.getElementLength();
		const elementType = this.getElementType();

		if ( elementLength === 1 ) {

			for ( let i = 0; i < array.length; i ++ ) {

				const index = i * 4;

				value[ index ] = array[ i ];

			}

		} else if ( elementType === 'color' ) {

			for ( let i = 0; i < array.length; i ++ ) {

				const index = i * 4;
				const vector = array[ i ];

				value[ index ] = vector.r;
				value[ index + 1 ] = vector.g;
				value[ index + 2 ] = vector.b || 0;
				//value[ index + 3 ] = vector.a || 0;

			}

		} else {

			for ( let i = 0; i < array.length; i ++ ) {

				const index = i * 4;
				const vector = array[ i ];

				value[ index ] = vector.x;
				value[ index + 1 ] = vector.y;
				value[ index + 2 ] = vector.z || 0;
				value[ index + 3 ] = vector.w || 0;

			}

		}

	}

	setup( builder ) {

		const length = this.array.length;

		this._elementType = this.elementType === null ? getValueType( this.array[ 0 ] ) : this.elementType;
		this._elementLength = builder.getTypeLength( this._elementType );

		let arrayType = Float32Array;

		if ( this._elementType.charAt( 0 ) === 'i' ) arrayType = Int32Array;
		else if ( this._elementType.charAt( 0 ) === 'u' ) arrayType = Uint32Array;

		this.value = new arrayType( length * 4 );
		this.bufferCount = length;
		this.bufferType = builder.changeComponentType( 'vec4', builder.getComponentType( this._elementType ) );

		return super.setup( builder );

	}

	element( indexNode ) {

		return nodeObject( new UniformsElementNode( this, nodeObject( indexNode ) ) );

	}

}

const uniforms = ( values, nodeType ) => nodeObject( new UniformsNode( values, nodeType ) );

addNodeClass( 'UniformsNode', UniformsNode );

class ReferenceElementNode extends ArrayElementNode {

	constructor( referenceNode, indexNode ) {

		super( referenceNode, indexNode );

		this.referenceNode = referenceNode;

		this.isReferenceElementNode = true;

	}

	getNodeType() {

		return this.referenceNode.uniformType;

	}

	generate( builder ) {

		const snippet = super.generate( builder );
		const arrayType = this.referenceNode.getNodeType();
		const elementType = this.getNodeType();

		return builder.format( snippet, arrayType, elementType );

	}

}

class ReferenceNode extends Node {

	constructor( property, uniformType, object = null, count = null ) {

		super();

		this.property = property;
		this.uniformType = uniformType;
		this.object = object;
		this.count = count;

		this.properties = property.split( '.' );
		this.reference = null;
		this.node = null;

		this.updateType = NodeUpdateType.OBJECT;

	}

	element( indexNode ) {

		return nodeObject( new ReferenceElementNode( this, nodeObject( indexNode ) ) );

	}

	setNodeType( uniformType ) {

		let node = null;

		if ( this.count !== null ) {

			node = buffer( null, uniformType, this.count );

		} else if ( Array.isArray( this.getValueFromReference() ) ) {

			node = uniforms( null, uniformType );

		} else if ( uniformType === 'texture' ) {

			node = texture( null );

		} else {

			node = uniform( null, uniformType );

		}

		this.node = node;

	}

	getNodeType( builder ) {

		if ( this.node === null ) {

			this.updateValue();

		}

		return this.node.getNodeType( builder );

	}

	getValueFromReference( object = this.reference ) {

		const { properties } = this;

		let value = object[ properties[ 0 ] ];

		for ( let i = 1; i < properties.length; i ++ ) {

			value = value[ properties[ i ] ];

		}

		return value;

	}

	updateReference( state ) {

		this.reference = this.object !== null ? this.object : state.object;

		return this.reference;

	}

	setup() {

		this.updateValue();

		return this.node;

	}

	update( /*frame*/ ) {

		this.updateValue();

	}

	updateValue() {

		if ( this.node === null ) this.setNodeType( this.uniformType );

		const value = this.getValueFromReference();

		if ( Array.isArray( value ) ) {

			this.node.array = value;

		} else {

			this.node.value = value;

		}

	}

}

const reference = ( name, type, object ) => nodeObject( new ReferenceNode( name, type, object ) );
const referenceBuffer = ( name, type, count, object ) => nodeObject( new ReferenceNode( name, type, object, count ) );

addNodeClass( 'ReferenceNode', ReferenceNode );

class MaterialReferenceNode extends ReferenceNode {

	constructor( property, inputType, material = null ) {

		super( property, inputType, material );

		this.material = material;

		//this.updateType = NodeUpdateType.RENDER;

	}

	/*setNodeType( node ) {

		super.setNodeType( node );

		this.node.groupNode = renderGroup;

	}*/

	updateReference( state ) {

		this.reference = this.material !== null ? this.material : state.material;

		return this.reference;

	}

}

const materialReference = ( name, type, material ) => nodeObject( new MaterialReferenceNode( name, type, material ) );

addNodeClass( 'MaterialReferenceNode', MaterialReferenceNode );

const cameraGroup = /*#__PURE__*/ sharedUniformGroup( 'camera' ).onRenderUpdate( () => {

	cameraGroup.needsUpdate = true;

} );

const cameraNear = /*#__PURE__*/ uniform( 'float' ).label( 'cameraNear' ).setGroup( cameraGroup ).onRenderUpdate( ( { camera } ) => camera.near );
const cameraFar = /*#__PURE__*/ uniform( 'float' ).label( 'cameraFar' ).setGroup( cameraGroup ).onRenderUpdate( ( { camera } ) => camera.far );
const cameraLogDepth = /*#__PURE__*/ uniform( 'float' ).label( 'cameraLogDepth' ).setGroup( cameraGroup ).onRenderUpdate( ( { camera } ) => 2.0 / ( Math.log( camera.far + 1.0 ) / Math.LN2 ) );
const cameraProjectionMatrix = /*#__PURE__*/ uniform( 'mat4' ).label( 'cameraProjectionMatrix' ).setGroup( cameraGroup ).onRenderUpdate( ( { camera } ) => camera.projectionMatrix );
const cameraProjectionMatrixInverse = /*#__PURE__*/ uniform( 'mat4' ).label( 'cameraProjectionMatrixInverse' ).setGroup( cameraGroup ).onRenderUpdate( ( { camera } ) => camera.projectionMatrixInverse );
const cameraViewMatrix = /*#__PURE__*/ uniform( 'mat4' ).label( 'cameraViewMatrix' ).setGroup( cameraGroup ).onRenderUpdate( ( { camera } ) => camera.matrixWorldInverse );
const cameraWorldMatrix = /*#__PURE__*/ uniform( 'mat4' ).label( 'cameraWorldMatrix' ).setGroup( cameraGroup ).onRenderUpdate( ( { camera } ) => camera.matrixWorld );
const cameraNormalMatrix = /*#__PURE__*/ uniform( 'mat3' ).label( 'cameraNormalMatrix' ).setGroup( cameraGroup ).onRenderUpdate( ( { camera } ) => camera.normalMatrix );
const cameraPosition = /*#__PURE__*/ uniform( new Vector3() ).label( 'cameraPosition' ).setGroup( cameraGroup ).onRenderUpdate( ( { camera }, self ) => self.value.setFromMatrixPosition( camera.matrixWorld ) );

class Object3DNode extends Node {

	constructor( scope = Object3DNode.VIEW_MATRIX, object3d = null ) {

		super();

		this.scope = scope;
		this.object3d = object3d;

		this.updateType = NodeUpdateType.OBJECT;

		this._uniformNode = new UniformNode( null );

	}

	getNodeType() {

		const scope = this.scope;

		if ( scope === Object3DNode.WORLD_MATRIX || scope === Object3DNode.VIEW_MATRIX ) {

			return 'mat4';

		} else if ( scope === Object3DNode.NORMAL_MATRIX ) {

			return 'mat3';

		} else if ( scope === Object3DNode.POSITION || scope === Object3DNode.VIEW_POSITION || scope === Object3DNode.DIRECTION || scope === Object3DNode.SCALE ) {

			return 'vec3';

		}

	}

	update( frame ) {

		const object = this.object3d;
		const uniformNode = this._uniformNode;
		const scope = this.scope;

		if ( scope === Object3DNode.VIEW_MATRIX ) {

			uniformNode.value = object.modelViewMatrix;

		} else if ( scope === Object3DNode.NORMAL_MATRIX ) {

			uniformNode.value = object.normalMatrix;

		} else if ( scope === Object3DNode.WORLD_MATRIX ) {

			uniformNode.value = object.matrixWorld;

		} else if ( scope === Object3DNode.POSITION ) {

			uniformNode.value = uniformNode.value || new Vector3();

			uniformNode.value.setFromMatrixPosition( object.matrixWorld );

		} else if ( scope === Object3DNode.SCALE ) {

			uniformNode.value = uniformNode.value || new Vector3();

			uniformNode.value.setFromMatrixScale( object.matrixWorld );

		} else if ( scope === Object3DNode.DIRECTION ) {

			uniformNode.value = uniformNode.value || new Vector3();

			object.getWorldDirection( uniformNode.value );

		} else if ( scope === Object3DNode.VIEW_POSITION ) {

			const camera = frame.camera;

			uniformNode.value = uniformNode.value || new Vector3();
			uniformNode.value.setFromMatrixPosition( object.matrixWorld );

			uniformNode.value.applyMatrix4( camera.matrixWorldInverse );

		}

	}

	generate( builder ) {

		const scope = this.scope;

		if ( scope === Object3DNode.WORLD_MATRIX || scope === Object3DNode.VIEW_MATRIX ) {

			this._uniformNode.nodeType = 'mat4';

		} else if ( scope === Object3DNode.NORMAL_MATRIX ) {

			this._uniformNode.nodeType = 'mat3';

		} else if ( scope === Object3DNode.POSITION || scope === Object3DNode.VIEW_POSITION || scope === Object3DNode.DIRECTION || scope === Object3DNode.SCALE ) {

			this._uniformNode.nodeType = 'vec3';

		}

		return this._uniformNode.build( builder );

	}

	serialize( data ) {

		super.serialize( data );

		data.scope = this.scope;

	}

	deserialize( data ) {

		super.deserialize( data );

		this.scope = data.scope;

	}

}

Object3DNode.VIEW_MATRIX = 'viewMatrix';
Object3DNode.NORMAL_MATRIX = 'normalMatrix';
Object3DNode.WORLD_MATRIX = 'worldMatrix';
Object3DNode.POSITION = 'position';
Object3DNode.SCALE = 'scale';
Object3DNode.VIEW_POSITION = 'viewPosition';
Object3DNode.DIRECTION = 'direction';

const objectDirection = nodeProxy( Object3DNode, Object3DNode.DIRECTION );
const objectViewMatrix = nodeProxy( Object3DNode, Object3DNode.VIEW_MATRIX );
const objectNormalMatrix = nodeProxy( Object3DNode, Object3DNode.NORMAL_MATRIX );
const objectWorldMatrix = nodeProxy( Object3DNode, Object3DNode.WORLD_MATRIX );
const objectPosition = nodeProxy( Object3DNode, Object3DNode.POSITION );
const objectScale = nodeProxy( Object3DNode, Object3DNode.SCALE );
const objectViewPosition = nodeProxy( Object3DNode, Object3DNode.VIEW_POSITION );

addNodeClass( 'Object3DNode', Object3DNode );

class ModelNode extends Object3DNode {

	constructor( scope = ModelNode.VIEW_MATRIX ) {

		super( scope );

	}

	update( frame ) {

		this.object3d = frame.object;

		super.update( frame );

	}

}

const modelDirection = nodeImmutable( ModelNode, ModelNode.DIRECTION );
const modelViewMatrix = nodeImmutable( ModelNode, ModelNode.VIEW_MATRIX ).label( 'modelViewMatrix' ).temp( 'ModelViewMatrix' );
const modelNormalMatrix = nodeImmutable( ModelNode, ModelNode.NORMAL_MATRIX );
const modelWorldMatrix = nodeImmutable( ModelNode, ModelNode.WORLD_MATRIX );
const modelPosition = nodeImmutable( ModelNode, ModelNode.POSITION );
const modelScale = nodeImmutable( ModelNode, ModelNode.SCALE );
const modelViewPosition = nodeImmutable( ModelNode, ModelNode.VIEW_POSITION );
const modelWorldMatrixInverse = uniform( new Matrix4() ).onObjectUpdate( ( { object }, self ) => self.value.copy( object.matrixWorld ).invert() );

addNodeClass( 'ModelNode', ModelNode );

const normalGeometry = /*#__PURE__*/ attribute( 'normal', 'vec3', vec3( 0, 1, 0 ) );
const normalLocal = /*#__PURE__*/ normalGeometry.toVar( 'normalLocal' );
const normalView = /*#__PURE__*/ varying( modelNormalMatrix.mul( normalLocal ), 'v_normalView' ).normalize().toVar( 'normalView' );
const normalWorld = /*#__PURE__*/ varying( normalView.transformDirection( cameraViewMatrix ), 'v_normalWorld' ).normalize().toVar( 'transformedNormalWorld' );
const transformedNormalView = /*#__PURE__*/ property( 'vec3', 'transformedNormalView' );
const transformedNormalWorld = /*#__PURE__*/ transformedNormalView.transformDirection( cameraViewMatrix ).normalize().toVar( 'transformedNormalWorld' );
const transformedClearcoatNormalView = /*#__PURE__*/ property( 'vec3', 'transformedClearcoatNormalView' );

const _propertyCache = new Map();

class MaterialNode extends Node {

	constructor( scope ) {

		super();

		this.scope = scope;

	}

	getCache( property, type ) {

		let node = _propertyCache.get( property );

		if ( node === undefined ) {

			node = materialReference( property, type );

			_propertyCache.set( property, node );

		}

		return node;

	}

	getFloat( property ) {

		return this.getCache( property, 'float' );

	}

	getColor( property ) {

		return this.getCache( property, 'color' );

	}

	getTexture( property ) {

		return this.getCache( property === 'map' ? 'map' : property + 'Map', 'texture' );

	}

	setup( builder ) {

		const material = builder.context.material;
		const scope = this.scope;

		let node = null;

		if ( scope === MaterialNode.COLOR ) {

			const colorNode = this.getColor( scope );

			if ( material.map && material.map.isTexture === true ) {

				node = colorNode.mul( this.getTexture( 'map' ) );

			} else {

				node = colorNode;

			}

		} else if ( scope === MaterialNode.OPACITY ) {

			const opacityNode = this.getFloat( scope );

			if ( material.alphaMap && material.alphaMap.isTexture === true ) {

				node = opacityNode.mul( this.getTexture( 'alpha' ) );

			} else {

				node = opacityNode;

			}

		} else if ( scope === MaterialNode.SPECULAR_STRENGTH ) {

			if ( material.specularMap && material.specularMap.isTexture === true ) {

				node = this.getTexture( 'specular' ).r;

			} else {

				node = float( 1 );

			}

		} else if ( scope === MaterialNode.SPECULAR_INTENSITY ) {

			const specularIntensity = this.getFloat( scope );

			if ( material.specularMap ) {

				node = specularIntensity.mul( this.getTexture( scope ).a );

			} else {

				node = specularIntensity;

			}

		} else if ( scope === MaterialNode.SPECULAR_COLOR ) {

			const specularColorNode = this.getColor( scope );

			if ( material.specularColorMap && material.specularColorMap.isTexture === true ) {

				node = specularColorNode.mul( this.getTexture( scope ).rgb );

			} else {

				node = specularColorNode;

			}

		} else if ( scope === MaterialNode.ROUGHNESS ) { // TODO: cleanup similar branches

			const roughnessNode = this.getFloat( scope );

			if ( material.roughnessMap && material.roughnessMap.isTexture === true ) {

				node = roughnessNode.mul( this.getTexture( scope ).g );

			} else {

				node = roughnessNode;

			}

		} else if ( scope === MaterialNode.METALNESS ) {

			const metalnessNode = this.getFloat( scope );

			if ( material.metalnessMap && material.metalnessMap.isTexture === true ) {

				node = metalnessNode.mul( this.getTexture( scope ).b );

			} else {

				node = metalnessNode;

			}

		} else if ( scope === MaterialNode.EMISSIVE ) {

			const emissiveNode = this.getColor( scope );

			if ( material.emissiveMap && material.emissiveMap.isTexture === true ) {

				node = emissiveNode.mul( this.getTexture( scope ) );

			} else {

				node = emissiveNode;

			}

		} else if ( scope === MaterialNode.NORMAL ) {

			if ( material.normalMap ) {

				node = this.getTexture( 'normal' ).normalMap( this.getCache( 'normalScale', 'vec2' ) );

			} else if ( material.bumpMap ) {

				node = this.getTexture( 'bump' ).r.bumpMap( this.getFloat( 'bumpScale' ) );

			} else {

				node = normalView;

			}

		} else if ( scope === MaterialNode.CLEARCOAT ) {

			const clearcoatNode = this.getFloat( scope );

			if ( material.clearcoatMap && material.clearcoatMap.isTexture === true ) {

				node = clearcoatNode.mul( this.getTexture( scope ).r );

			} else {

				node = clearcoatNode;

			}

		} else if ( scope === MaterialNode.CLEARCOAT_ROUGHNESS ) {

			const clearcoatRoughnessNode = this.getFloat( scope );

			if ( material.clearcoatRoughnessMap && material.clearcoatRoughnessMap.isTexture === true ) {

				node = clearcoatRoughnessNode.mul( this.getTexture( scope ).r );

			} else {

				node = clearcoatRoughnessNode;

			}

		} else if ( scope === MaterialNode.CLEARCOAT_NORMAL ) {

			if ( material.clearcoatNormalMap ) {

				node = this.getTexture( scope ).normalMap( this.getCache( scope + 'Scale', 'vec2' ) );

			} else {

				node = normalView;

			}

		} else if ( scope === MaterialNode.SHEEN ) {

			const sheenNode = this.getColor( 'sheenColor' ).mul( this.getFloat( 'sheen' ) ); // Move this mul() to CPU

			if ( material.sheenColorMap && material.sheenColorMap.isTexture === true ) {

				node = sheenNode.mul( this.getTexture( 'sheenColor' ).rgb );

			} else {

				node = sheenNode;

			}

		} else if ( scope === MaterialNode.SHEEN_ROUGHNESS ) {

			const sheenRoughnessNode = this.getFloat( scope );

			if ( material.sheenRoughnessMap && material.sheenRoughnessMap.isTexture === true ) {

				node = sheenRoughnessNode.mul( this.getTexture( scope ).a );

			} else {

				node = sheenRoughnessNode;

			}

			node = node.clamp( 0.07, 1.0 );

		} else if ( scope === MaterialNode.ANISOTROPY ) {

			if ( material.anisotropyMap && material.anisotropyMap.isTexture === true ) {

				const anisotropyPolar = this.getTexture( scope );
				const anisotropyMat = mat2( materialAnisotropyVector.x, materialAnisotropyVector.y, materialAnisotropyVector.y.negate(), materialAnisotropyVector.x );

				node = anisotropyMat.mul( anisotropyPolar.rg.mul( 2.0 ).sub( vec2( 1.0 ) ).normalize().mul( anisotropyPolar.b ) );

			} else {

				node = materialAnisotropyVector;

			}

		} else if ( scope === MaterialNode.IRIDESCENCE_THICKNESS ) {

			const iridescenceThicknessMaximum = reference( '1', 'float', material.iridescenceThicknessRange );

			if ( material.iridescenceThicknessMap ) {

				const iridescenceThicknessMinimum = reference( '0', 'float', material.iridescenceThicknessRange );

				node = iridescenceThicknessMaximum.sub( iridescenceThicknessMinimum ).mul( this.getTexture( scope ).g ).add( iridescenceThicknessMinimum );

			} else {

				node = iridescenceThicknessMaximum;

			}

		} else if ( scope === MaterialNode.TRANSMISSION ) {

			const transmissionNode = this.getFloat( scope );

			if ( material.transmissionMap ) {

				node = transmissionNode.mul( this.getTexture( scope ).r );

			} else {

				node = transmissionNode;

			}

		} else if ( scope === MaterialNode.THICKNESS ) {

			const thicknessNode = this.getFloat( scope );

			if ( material.thicknessMap ) {

				node = thicknessNode.mul( this.getTexture( scope ).g );

			} else {

				node = thicknessNode;

			}

		} else if ( scope === MaterialNode.IOR ) {

			node = this.getFloat( scope );

		} else {

			const outputType = this.getNodeType( builder );

			node = this.getCache( scope, outputType );

		}

		return node;

	}

}

MaterialNode.ALPHA_TEST = 'alphaTest';
MaterialNode.COLOR = 'color';
MaterialNode.OPACITY = 'opacity';
MaterialNode.SHININESS = 'shininess';
MaterialNode.SPECULAR = 'specular';
MaterialNode.SPECULAR_STRENGTH = 'specularStrength';
MaterialNode.SPECULAR_INTENSITY = 'specularIntensity';
MaterialNode.SPECULAR_COLOR = 'specularColor';
MaterialNode.REFLECTIVITY = 'reflectivity';
MaterialNode.ROUGHNESS = 'roughness';
MaterialNode.METALNESS = 'metalness';
MaterialNode.NORMAL = 'normal';
MaterialNode.CLEARCOAT = 'clearcoat';
MaterialNode.CLEARCOAT_ROUGHNESS = 'clearcoatRoughness';
MaterialNode.CLEARCOAT_NORMAL = 'clearcoatNormal';
MaterialNode.EMISSIVE = 'emissive';
MaterialNode.ROTATION = 'rotation';
MaterialNode.SHEEN = 'sheen';
MaterialNode.SHEEN_ROUGHNESS = 'sheenRoughness';
MaterialNode.ANISOTROPY = 'anisotropy';
MaterialNode.IRIDESCENCE = 'iridescence';
MaterialNode.IRIDESCENCE_IOR = 'iridescenceIOR';
MaterialNode.IRIDESCENCE_THICKNESS = 'iridescenceThickness';
MaterialNode.IOR = 'ior';
MaterialNode.TRANSMISSION = 'transmission';
MaterialNode.THICKNESS = 'thickness';
MaterialNode.ATTENUATION_DISTANCE = 'attenuationDistance';
MaterialNode.ATTENUATION_COLOR = 'attenuationColor';
MaterialNode.LINE_SCALE = 'scale';
MaterialNode.LINE_DASH_SIZE = 'dashSize';
MaterialNode.LINE_GAP_SIZE = 'gapSize';
MaterialNode.LINE_WIDTH = 'linewidth';
MaterialNode.LINE_DASH_OFFSET = 'dashOffset';
MaterialNode.POINT_WIDTH = 'pointWidth';
MaterialNode.DISPERSION = 'dispersion';

const materialAlphaTest = nodeImmutable( MaterialNode, MaterialNode.ALPHA_TEST );
const materialColor = nodeImmutable( MaterialNode, MaterialNode.COLOR );
const materialShininess = nodeImmutable( MaterialNode, MaterialNode.SHININESS );
const materialEmissive = nodeImmutable( MaterialNode, MaterialNode.EMISSIVE );
const materialOpacity = nodeImmutable( MaterialNode, MaterialNode.OPACITY );
const materialSpecular = nodeImmutable( MaterialNode, MaterialNode.SPECULAR );

const materialSpecularIntensity = nodeImmutable( MaterialNode, MaterialNode.SPECULAR_INTENSITY );
const materialSpecularColor = nodeImmutable( MaterialNode, MaterialNode.SPECULAR_COLOR );

const materialSpecularStrength = nodeImmutable( MaterialNode, MaterialNode.SPECULAR_STRENGTH );
const materialReflectivity = nodeImmutable( MaterialNode, MaterialNode.REFLECTIVITY );
const materialRoughness = nodeImmutable( MaterialNode, MaterialNode.ROUGHNESS );
const materialMetalness = nodeImmutable( MaterialNode, MaterialNode.METALNESS );
const materialNormal = nodeImmutable( MaterialNode, MaterialNode.NORMAL );
const materialClearcoat = nodeImmutable( MaterialNode, MaterialNode.CLEARCOAT );
const materialClearcoatRoughness = nodeImmutable( MaterialNode, MaterialNode.CLEARCOAT_ROUGHNESS );
const materialClearcoatNormal = nodeImmutable( MaterialNode, MaterialNode.CLEARCOAT_NORMAL );
const materialRotation = nodeImmutable( MaterialNode, MaterialNode.ROTATION );
const materialSheen = nodeImmutable( MaterialNode, MaterialNode.SHEEN );
const materialSheenRoughness = nodeImmutable( MaterialNode, MaterialNode.SHEEN_ROUGHNESS );
const materialAnisotropy = nodeImmutable( MaterialNode, MaterialNode.ANISOTROPY );
const materialIridescence = nodeImmutable( MaterialNode, MaterialNode.IRIDESCENCE );
const materialIridescenceIOR = nodeImmutable( MaterialNode, MaterialNode.IRIDESCENCE_IOR );
const materialIridescenceThickness = nodeImmutable( MaterialNode, MaterialNode.IRIDESCENCE_THICKNESS );
const materialTransmission = nodeImmutable( MaterialNode, MaterialNode.TRANSMISSION );
const materialThickness = nodeImmutable( MaterialNode, MaterialNode.THICKNESS );
const materialIOR = nodeImmutable( MaterialNode, MaterialNode.IOR );
const materialAttenuationDistance = nodeImmutable( MaterialNode, MaterialNode.ATTENUATION_DISTANCE );
const materialAttenuationColor = nodeImmutable( MaterialNode, MaterialNode.ATTENUATION_COLOR );
const materialLineScale = nodeImmutable( MaterialNode, MaterialNode.LINE_SCALE );
const materialLineDashSize = nodeImmutable( MaterialNode, MaterialNode.LINE_DASH_SIZE );
const materialLineGapSize = nodeImmutable( MaterialNode, MaterialNode.LINE_GAP_SIZE );
const materialLineWidth = nodeImmutable( MaterialNode, MaterialNode.LINE_WIDTH );
const materialLineDashOffset = nodeImmutable( MaterialNode, MaterialNode.LINE_DASH_OFFSET );
const materialPointWidth = nodeImmutable( MaterialNode, MaterialNode.POINT_WIDTH );
const materialDispersion = nodeImmutable( MaterialNode, MaterialNode.DISPERSION );
const materialAnisotropyVector = uniform( new Vector2() ).onReference( function ( frame ) {

	return frame.material;

} ).onRenderUpdate( function ( { material } ) {

	this.value.set( material.anisotropy * Math.cos( material.anisotropyRotation ), material.anisotropy * Math.sin( material.anisotropyRotation ) );

} );

addNodeClass( 'MaterialNode', MaterialNode );

const positionGeometry = /*#__PURE__*/ attribute( 'position', 'vec3' );
const positionLocal = /*#__PURE__*/ positionGeometry.toVar( 'positionLocal' );
const positionWorld = /*#__PURE__*/ varying( modelWorldMatrix.mul( positionLocal ).xyz, 'v_positionWorld' );
const positionWorldDirection = /*#__PURE__*/ varying( positionLocal.transformDirection( modelWorldMatrix ), 'v_positionWorldDirection' ).normalize().toVar( 'positionWorldDirection' );
const positionView = /*#__PURE__*/ varying( modelViewMatrix.mul( positionLocal ).xyz, 'v_positionView' );
const positionViewDirection = /*#__PURE__*/ varying( positionView.negate(), 'v_positionViewDirection' ).normalize().toVar( 'positionViewDirection' );

class ModelViewProjectionNode extends TempNode {

	constructor( positionNode = null ) {

		super( 'vec4' );

		this.positionNode = positionNode;

	}

	setup( builder ) {

		if ( builder.shaderStage === 'fragment' ) {

			return varying( builder.context.mvp );

		}

		const position = this.positionNode || positionLocal;

		return cameraProjectionMatrix.mul( modelViewMatrix ).mul( position );

	}

}

const modelViewProjection = nodeProxy( ModelViewProjectionNode );

addNodeClass( 'ModelViewProjectionNode', ModelViewProjectionNode );

class BufferAttributeNode extends InputNode {

	constructor( value, bufferType = null, bufferStride = 0, bufferOffset = 0 ) {

		super( value, bufferType );

		this.isBufferNode = true;

		this.bufferType = bufferType;
		this.bufferStride = bufferStride;
		this.bufferOffset = bufferOffset;

		this.usage = StaticDrawUsage;
		this.instanced = false;

		this.attribute = null;

		this.global = true;

		if ( value && value.isBufferAttribute === true ) {

			this.attribute = value;
			this.usage = value.usage;
			this.instanced = value.isInstancedBufferAttribute;

		}

	}

	getHash( builder ) {

		if ( this.bufferStride === 0 && this.bufferOffset === 0 ) {

			let bufferData = builder.globalCache.getData( this.value );

			if ( bufferData === undefined ) {

				bufferData = {
					node: this
				};

				builder.globalCache.setData( this.value, bufferData );

			}

			return bufferData.node.uuid;

		}

		return this.uuid;

	}

	getNodeType( builder ) {

		if ( this.bufferType === null ) {

			this.bufferType = builder.getTypeFromAttribute( this.attribute );

		}

		return this.bufferType;

	}

	setup( builder ) {

		if ( this.attribute !== null ) return;

		const type = this.getNodeType( builder );
		const array = this.value;
		const itemSize = builder.getTypeLength( type );
		const stride = this.bufferStride || itemSize;
		const offset = this.bufferOffset;

		const buffer = array.isInterleavedBuffer === true ? array : new InterleavedBuffer( array, stride );
		const bufferAttribute = new InterleavedBufferAttribute( buffer, itemSize, offset );

		buffer.setUsage( this.usage );

		this.attribute = bufferAttribute;
		this.attribute.isInstancedBufferAttribute = this.instanced; // @TODO: Add a possible: InstancedInterleavedBufferAttribute

	}

	generate( builder ) {

		const nodeType = this.getNodeType( builder );

		const nodeAttribute = builder.getBufferAttributeFromNode( this, nodeType );
		const propertyName = builder.getPropertyName( nodeAttribute );

		let output = null;

		if ( builder.shaderStage === 'vertex' || builder.shaderStage === 'compute' ) {

			this.name = propertyName;

			output = propertyName;

		} else {

			const nodeVarying = varying( this );

			output = nodeVarying.build( builder, nodeType );

		}

		return output;

	}

	getInputType( /*builder*/ ) {

		return 'bufferAttribute';

	}

	setUsage( value ) {

		this.usage = value;

		if ( this.attribute && this.attribute.isBufferAttribute === true ) {

			this.attribute.usage = value;

		}

		return this;

	}

	setInstanced( value ) {

		this.instanced = value;

		return this;

	}

}

const bufferAttribute = ( array, type, stride, offset ) => nodeObject( new BufferAttributeNode( array, type, stride, offset ) );
const dynamicBufferAttribute = ( array, type, stride, offset ) => bufferAttribute( array, type, stride, offset ).setUsage( DynamicDrawUsage );

const instancedBufferAttribute = ( array, type, stride, offset ) => bufferAttribute( array, type, stride, offset ).setInstanced( true );
const instancedDynamicBufferAttribute = ( array, type, stride, offset ) => dynamicBufferAttribute( array, type, stride, offset ).setInstanced( true );

addNodeElement( 'toAttribute', ( bufferNode ) => bufferAttribute( bufferNode.value ) );

addNodeClass( 'BufferAttributeNode', BufferAttributeNode );

class InstanceNode extends Node {

	constructor( instanceMesh ) {

		super( 'void' );

		this.instanceMesh = instanceMesh;

		this.instanceMatrixNode = null;

		this.instanceColorNode = null;

		this.updateType = NodeUpdateType.FRAME;

		this.buffer = null;
		this.bufferColor = null;

	}

	setup( /*builder*/ ) {

		let instanceMatrixNode = this.instanceMatrixNode;

		const instanceMesh = this.instanceMesh;

		if ( instanceMatrixNode === null ) {

			const instanceAttribute = instanceMesh.instanceMatrix;
			const buffer = new InstancedInterleavedBuffer( instanceAttribute.array, 16, 1 );

			this.buffer = buffer;
			const bufferFn = instanceAttribute.usage === DynamicDrawUsage ? instancedDynamicBufferAttribute : instancedBufferAttribute;

			const instanceBuffers = [
				// F.Signature -> bufferAttribute( array, type, stride, offset )
				bufferFn( buffer, 'vec4', 16, 0 ),
				bufferFn( buffer, 'vec4', 16, 4 ),
				bufferFn( buffer, 'vec4', 16, 8 ),
				bufferFn( buffer, 'vec4', 16, 12 )
			];

			instanceMatrixNode = mat4( ...instanceBuffers );

			this.instanceMatrixNode = instanceMatrixNode;

		}

		const instanceColorAttribute = instanceMesh.instanceColor;

		if ( instanceColorAttribute && this.instanceColorNode === null ) {

			const buffer = new InstancedBufferAttribute( instanceColorAttribute.array, 3 );
			const bufferFn = instanceColorAttribute.usage === DynamicDrawUsage ? instancedDynamicBufferAttribute : instancedBufferAttribute;

			this.bufferColor = buffer;
			this.instanceColorNode = vec3( bufferFn( buffer, 'vec3', 3, 0 ) );

		}

		// POSITION

		const instancePosition = instanceMatrixNode.mul( positionLocal ).xyz;

		// NORMAL

		const m = mat3( instanceMatrixNode[ 0 ].xyz, instanceMatrixNode[ 1 ].xyz, instanceMatrixNode[ 2 ].xyz );

		const transformedNormal = normalLocal.div( vec3( m[ 0 ].dot( m[ 0 ] ), m[ 1 ].dot( m[ 1 ] ), m[ 2 ].dot( m[ 2 ] ) ) );

		const instanceNormal = m.mul( transformedNormal ).xyz;

		// ASSIGNS

		positionLocal.assign( instancePosition );
		normalLocal.assign( instanceNormal );

		// COLOR

		if ( this.instanceColorNode !== null ) {

			varyingProperty( 'vec3', 'vInstanceColor' ).assign( this.instanceColorNode );

		}

	}

	update( /*frame*/ ) {

		if ( this.instanceMesh.instanceMatrix.usage !== DynamicDrawUsage && this.instanceMesh.instanceMatrix.version !== this.buffer.version ) {

			this.buffer.version = this.instanceMesh.instanceMatrix.version;

		}

		if ( this.instanceMesh.instanceColor && this.instanceMesh.instanceColor.usage !== DynamicDrawUsage && this.instanceMesh.instanceColor.version !== this.bufferColor.version ) {

			this.bufferColor.version = this.instanceMesh.instanceColor.version;

		}

	}

}

const instance = nodeProxy( InstanceNode );

addNodeClass( 'InstanceNode', InstanceNode );

const tangentGeometry = /*#__PURE__*/ tslFn( ( stack, builder ) => {

	if ( builder.geometry.hasAttribute( 'tangent' ) === false ) {

		builder.geometry.computeTangents();

	}

	return attribute( 'tangent', 'vec4' );

} )();

const tangentLocal = /*#__PURE__*/ tangentGeometry.xyz.toVar( 'tangentLocal' );
const tangentView = /*#__PURE__*/ varying( modelViewMatrix.mul( vec4( tangentLocal, 0 ) ).xyz, 'v_tangentView' ).normalize().toVar( 'tangentView' );
const tangentWorld = /*#__PURE__*/ varying( tangentView.transformDirection( cameraViewMatrix ), 'v_tangentWorld' ).normalize().toVar( 'tangentWorld' );
const transformedTangentView = /*#__PURE__*/ tangentView.toVar( 'transformedTangentView' );
const transformedTangentWorld = /*#__PURE__*/ transformedTangentView.transformDirection( cameraViewMatrix ).normalize().toVar( 'transformedTangentWorld' );

class BatchNode extends Node {

	constructor( batchMesh ) {

		super( 'void' );

		this.batchMesh = batchMesh;


		this.instanceColorNode = null;

		this.batchingIdNode = null;

	}

	setup( builder ) {

		// POSITION

		if ( this.batchingIdNode === null ) {

			if ( builder.getDrawIndex() === null ) {

				this.batchingIdNode = instanceIndex;

			} else {

				this.batchingIdNode = drawIndex;

			}

		}

		const getIndirectIndex = tslFn( ( [ id ] ) => {

			const size = textureSize( textureLoad( this.batchMesh._indirectTexture ), 0 );
			const x = int( id ).remainder( int( size ) );
			const y = int( id ).div( int( size ) );
			return textureLoad( this.batchMesh._indirectTexture, ivec2( x, y ) ).x;

		} ).setLayout( {
			name: 'getIndirectIndex',
			type: 'uint',
			inputs: [
				{ name: 'id', type: 'int' }
			]
		} );

		const matriceTexture = this.batchMesh._matricesTexture;

		const size = textureSize( textureLoad( matriceTexture ), 0 );
		const j = float( getIndirectIndex( int( this.batchingIdNode ) ) ).mul( 4 ).toVar();

		const x = int( j.mod( size ) );
		const y = int( j ).div( int( size ) );
		const batchingMatrix = mat4(
			textureLoad( matriceTexture, ivec2( x, y ) ),
			textureLoad( matriceTexture, ivec2( x.add( 1 ), y ) ),
			textureLoad( matriceTexture, ivec2( x.add( 2 ), y ) ),
			textureLoad( matriceTexture, ivec2( x.add( 3 ), y ) )
		);

		const bm = mat3(
			batchingMatrix[ 0 ].xyz,
			batchingMatrix[ 1 ].xyz,
			batchingMatrix[ 2 ].xyz
		 );

		positionLocal.assign( batchingMatrix.mul( positionLocal ) );

		const transformedNormal = normalLocal.div( vec3( bm[ 0 ].dot( bm[ 0 ] ), bm[ 1 ].dot( bm[ 1 ] ), bm[ 2 ].dot( bm[ 2 ] ) ) );

		const batchingNormal = bm.mul( transformedNormal ).xyz;

		normalLocal.assign( batchingNormal );

		if ( builder.hasGeometryAttribute( 'tangent' ) ) {

			tangentLocal.mulAssign( bm );

		}

	}

}

const batch = nodeProxy( BatchNode );

addNodeClass( 'batch', BatchNode );

class SkinningNode extends Node {

	constructor( skinnedMesh, useReference = false ) {

		super( 'void' );

		this.skinnedMesh = skinnedMesh;
		this.useReference = useReference;

		this.updateType = NodeUpdateType.OBJECT;

		//

		this.skinIndexNode = attribute( 'skinIndex', 'uvec4' );
		this.skinWeightNode = attribute( 'skinWeight', 'vec4' );

		let bindMatrixNode, bindMatrixInverseNode, boneMatricesNode;

		if ( useReference ) {

			bindMatrixNode = reference( 'bindMatrix', 'mat4' );
			bindMatrixInverseNode = reference( 'bindMatrixInverse', 'mat4' );
			boneMatricesNode = referenceBuffer( 'skeleton.boneMatrices', 'mat4', skinnedMesh.skeleton.bones.length );

		} else {

			bindMatrixNode = uniform( skinnedMesh.bindMatrix, 'mat4' );
			bindMatrixInverseNode = uniform( skinnedMesh.bindMatrixInverse, 'mat4' );
			boneMatricesNode = buffer( skinnedMesh.skeleton.boneMatrices, 'mat4', skinnedMesh.skeleton.bones.length );

		}

		this.bindMatrixNode = bindMatrixNode;
		this.bindMatrixInverseNode = bindMatrixInverseNode;
		this.boneMatricesNode = boneMatricesNode;

	}

	setup( builder ) {

		const { skinIndexNode, skinWeightNode, bindMatrixNode, bindMatrixInverseNode, boneMatricesNode } = this;

		const boneMatX = boneMatricesNode.element( skinIndexNode.x );
		const boneMatY = boneMatricesNode.element( skinIndexNode.y );
		const boneMatZ = boneMatricesNode.element( skinIndexNode.z );
		const boneMatW = boneMatricesNode.element( skinIndexNode.w );

		// POSITION

		const skinVertex = bindMatrixNode.mul( positionLocal );

		const skinned = add(
			boneMatX.mul( skinWeightNode.x ).mul( skinVertex ),
			boneMatY.mul( skinWeightNode.y ).mul( skinVertex ),
			boneMatZ.mul( skinWeightNode.z ).mul( skinVertex ),
			boneMatW.mul( skinWeightNode.w ).mul( skinVertex )
		);

		const skinPosition = bindMatrixInverseNode.mul( skinned ).xyz;

		// NORMAL

		let skinMatrix = add(
			skinWeightNode.x.mul( boneMatX ),
			skinWeightNode.y.mul( boneMatY ),
			skinWeightNode.z.mul( boneMatZ ),
			skinWeightNode.w.mul( boneMatW )
		);

		skinMatrix = bindMatrixInverseNode.mul( skinMatrix ).mul( bindMatrixNode );

		const skinNormal = skinMatrix.transformDirection( normalLocal ).xyz;

		// ASSIGNS

		positionLocal.assign( skinPosition );
		normalLocal.assign( skinNormal );

		if ( builder.hasGeometryAttribute( 'tangent' ) ) {

			tangentLocal.assign( skinNormal );

		}

	}

	generate( builder, output ) {

		if ( output !== 'void' ) {

			return positionLocal.build( builder, output );

		}

	}

	update( frame ) {

		const object = this.useReference ? frame.object : this.skinnedMesh;

		object.skeleton.update();

	}

}

const skinning = ( skinnedMesh ) => nodeObject( new SkinningNode( skinnedMesh ) );
const skinningReference = ( skinnedMesh ) => nodeObject( new SkinningNode( skinnedMesh, true ) );

addNodeClass( 'SkinningNode', SkinningNode );

class LoopNode extends Node {

	constructor( params = [] ) {

		super();

		this.params = params;

	}

	getVarName( index ) {

		return String.fromCharCode( 'i'.charCodeAt() + index );

	}

	getProperties( builder ) {

		const properties = builder.getNodeProperties( this );

		if ( properties.stackNode !== undefined ) return properties;

		//

		const inputs = {};

		for ( let i = 0, l = this.params.length - 1; i < l; i ++ ) {

			const param = this.params[ i ];

			const name = ( param.isNode !== true && param.name ) || this.getVarName( i );
			const type = ( param.isNode !== true && param.type ) || 'int';

			inputs[ name ] = expression( name, type );

		}

		const stack = builder.addStack(); // TODO: cache() it

		properties.returnsNode = this.params[ this.params.length - 1 ]( inputs, stack, builder );
		properties.stackNode = stack;

		builder.removeStack();

		return properties;

	}

	getNodeType( builder ) {

		const { returnsNode } = this.getProperties( builder );

		return returnsNode ? returnsNode.getNodeType( builder ) : 'void';

	}

	setup( builder ) {

		// setup properties

		this.getProperties( builder );

	}

	generate( builder ) {

		const properties = this.getProperties( builder );

		const params = this.params;
		const stackNode = properties.stackNode;

		for ( let i = 0, l = params.length - 1; i < l; i ++ ) {

			const param = params[ i ];

			let start = null, end = null, name = null, type = null, condition = null, update = null;

			if ( param.isNode ) {

				type = 'int';
				name = this.getVarName( i );
				start = '0';
				end = param.build( builder, type );
				condition = '<';

			} else {

				type = param.type || 'int';
				name = param.name || this.getVarName( i );
				start = param.start;
				end = param.end;
				condition = param.condition;
				update = param.update;

				if ( typeof start === 'number' ) start = start.toString();
				else if ( start && start.isNode ) start = start.build( builder, type );

				if ( typeof end === 'number' ) end = end.toString();
				else if ( end && end.isNode ) end = end.build( builder, type );

				if ( start !== undefined && end === undefined ) {

					start = start + ' - 1';
					end = '0';
					condition = '>=';

				} else if ( end !== undefined && start === undefined ) {

					start = '0';
					condition = '<';

				}

				if ( condition === undefined ) {

					if ( Number( start ) > Number( end ) ) {

						condition = '>=';

					} else {

						condition = '<';

					}

				}

			}

			const internalParam = { start, end, condition };

			//

			const startSnippet = internalParam.start;
			const endSnippet = internalParam.end;

			let declarationSnippet = '';
			let conditionalSnippet = '';
			let updateSnippet = '';

			if ( ! update ) {

				if ( type === 'int' || type === 'uint' ) {

					if ( condition.includes( '<' ) ) update = '++';
					else update = '--';

				} else {

					if ( condition.includes( '<' ) ) update = '+= 1.';
					else update = '-= 1.';

				}

			}

			declarationSnippet += builder.getVar( type, name ) + ' = ' + startSnippet;

			conditionalSnippet += name + ' ' + condition + ' ' + endSnippet;
			updateSnippet += name + ' ' + update;

			const forSnippet = `for ( ${ declarationSnippet }; ${ conditionalSnippet }; ${ updateSnippet } )`;

			builder.addFlowCode( ( i === 0 ? '\n' : '' ) + builder.tab + forSnippet + ' {\n\n' ).addFlowTab();

		}

		const stackSnippet = stackNode.build( builder, 'void' );

		const returnsSnippet = properties.returnsNode ? properties.returnsNode.build( builder ) : '';

		builder.removeFlowTab().addFlowCode( '\n' + builder.tab + stackSnippet );

		for ( let i = 0, l = this.params.length - 1; i < l; i ++ ) {

			builder.addFlowCode( ( i === 0 ? '' : builder.tab ) + '}\n\n' ).removeFlowTab();

		}

		builder.addFlowTab();

		return returnsSnippet;

	}

}

const loop = ( ...params ) => nodeObject( new LoopNode( nodeArray( params, 'int' ) ) ).append();
const Continue = () => expression( 'continue' ).append();
const Break = () => expression( 'break' ).append();

addNodeElement( 'loop', ( returns, ...params ) => bypass( returns, loop( ...params ) ) );

addNodeClass( 'LoopNode', LoopNode );

const morphTextures = new WeakMap();
const morphVec4 = new Vector4();

const getMorph = tslFn( ( { bufferMap, influence, stride, width, depth, offset } ) => {

	const texelIndex = int( vertexIndex ).mul( stride ).add( offset );

	const y = texelIndex.div( width );
	const x = texelIndex.sub( y.mul( width ) );

	const bufferAttrib = textureLoad( bufferMap, ivec2( x, y ) ).depth( depth );

	return bufferAttrib.mul( influence );

} );

function getEntry( geometry ) {

	const hasMorphPosition = geometry.morphAttributes.position !== undefined;
	const hasMorphNormals = geometry.morphAttributes.normal !== undefined;
	const hasMorphColors = geometry.morphAttributes.color !== undefined;

	// instead of using attributes, the WebGL 2 code path encodes morph targets
	// into an array of data textures. Each layer represents a single morph target.

	const morphAttribute = geometry.morphAttributes.position || geometry.morphAttributes.normal || geometry.morphAttributes.color;
	const morphTargetsCount = ( morphAttribute !== undefined ) ? morphAttribute.length : 0;

	let entry = morphTextures.get( geometry );

	if ( entry === undefined || entry.count !== morphTargetsCount ) {

		if ( entry !== undefined ) entry.texture.dispose();

		const morphTargets = geometry.morphAttributes.position || [];
		const morphNormals = geometry.morphAttributes.normal || [];
		const morphColors = geometry.morphAttributes.color || [];

		let vertexDataCount = 0;

		if ( hasMorphPosition === true ) vertexDataCount = 1;
		if ( hasMorphNormals === true ) vertexDataCount = 2;
		if ( hasMorphColors === true ) vertexDataCount = 3;

		let width = geometry.attributes.position.count * vertexDataCount;
		let height = 1;

		const maxTextureSize = 4096; // @TODO: Use 'capabilities.maxTextureSize'

		if ( width > maxTextureSize ) {

			height = Math.ceil( width / maxTextureSize );
			width = maxTextureSize;

		}

		const buffer = new Float32Array( width * height * 4 * morphTargetsCount );

		const bufferTexture = new DataArrayTexture( buffer, width, height, morphTargetsCount );
		bufferTexture.type = FloatType;
		bufferTexture.needsUpdate = true;

		// fill buffer

		const vertexDataStride = vertexDataCount * 4;

		for ( let i = 0; i < morphTargetsCount; i ++ ) {

			const morphTarget = morphTargets[ i ];
			const morphNormal = morphNormals[ i ];
			const morphColor = morphColors[ i ];

			const offset = width * height * 4 * i;

			for ( let j = 0; j < morphTarget.count; j ++ ) {

				const stride = j * vertexDataStride;

				if ( hasMorphPosition === true ) {

					morphVec4.fromBufferAttribute( morphTarget, j );

					buffer[ offset + stride + 0 ] = morphVec4.x;
					buffer[ offset + stride + 1 ] = morphVec4.y;
					buffer[ offset + stride + 2 ] = morphVec4.z;
					buffer[ offset + stride + 3 ] = 0;

				}

				if ( hasMorphNormals === true ) {

					morphVec4.fromBufferAttribute( morphNormal, j );

					buffer[ offset + stride + 4 ] = morphVec4.x;
					buffer[ offset + stride + 5 ] = morphVec4.y;
					buffer[ offset + stride + 6 ] = morphVec4.z;
					buffer[ offset + stride + 7 ] = 0;

				}

				if ( hasMorphColors === true ) {

					morphVec4.fromBufferAttribute( morphColor, j );

					buffer[ offset + stride + 8 ] = morphVec4.x;
					buffer[ offset + stride + 9 ] = morphVec4.y;
					buffer[ offset + stride + 10 ] = morphVec4.z;
					buffer[ offset + stride + 11 ] = ( morphColor.itemSize === 4 ) ? morphVec4.w : 1;

				}

			}

		}

		entry = {
			count: morphTargetsCount,
			texture: bufferTexture,
			stride: vertexDataCount,
			size: new Vector2( width, height )
		};

		morphTextures.set( geometry, entry );

		function disposeTexture() {

			bufferTexture.dispose();

			morphTextures.delete( geometry );

			geometry.removeEventListener( 'dispose', disposeTexture );

		}

		geometry.addEventListener( 'dispose', disposeTexture );

	}

	return entry;

}


class MorphNode extends Node {

	constructor( mesh ) {

		super( 'void' );

		this.mesh = mesh;
		this.morphBaseInfluence = uniform( 1 );

		this.updateType = NodeUpdateType.OBJECT;

	}

	setup( builder ) {

		const { geometry } = builder;

		const hasMorphPosition = geometry.morphAttributes.position !== undefined;
		const hasMorphNormals = geometry.morphAttributes.normal !== undefined;

		const morphAttribute = geometry.morphAttributes.position || geometry.morphAttributes.normal || geometry.morphAttributes.color;
		const morphTargetsCount = ( morphAttribute !== undefined ) ? morphAttribute.length : 0;

		// nodes

		const { texture: bufferMap, stride, size } = getEntry( geometry );

		if ( hasMorphPosition === true ) positionLocal.mulAssign( this.morphBaseInfluence );
		if ( hasMorphNormals === true ) normalLocal.mulAssign( this.morphBaseInfluence );

		const width = int( size.width );

		loop( morphTargetsCount, ( { i } ) => {

			const influence = float( 0 ).toVar();

			if ( this.mesh.count > 1 && ( this.mesh.morphTexture !== null && this.mesh.morphTexture !== undefined ) ) {

				influence.assign( textureLoad( this.mesh.morphTexture, ivec2( int( i ).add( 1 ), int( instanceIndex ) ) ).r );

			} else {

				influence.assign( reference( 'morphTargetInfluences', 'float' ).element( i ).toVar() );

			}

			if ( hasMorphPosition === true ) {

				positionLocal.addAssign( getMorph( {
					bufferMap,
					influence,
					stride,
					width,
					depth: i,
					offset: int( 0 )
				} ) );

			}

			if ( hasMorphNormals === true ) {

				normalLocal.addAssign( getMorph( {
					bufferMap,
					influence,
					stride,
					width,
					depth: i,
					offset: int( 1 )
				} ) );

			}

		} );

	}

	update() {

		const morphBaseInfluence = this.morphBaseInfluence;

		if ( this.mesh.geometry.morphTargetsRelative ) {

			morphBaseInfluence.value = 1;

		} else {

			morphBaseInfluence.value = 1 - this.mesh.morphTargetInfluences.reduce( ( a, b ) => a + b, 0 );

		}

	}

}

const morphReference = nodeProxy( MorphNode );

addNodeClass( 'MorphNode', MorphNode );

const reflectView = /*#__PURE__*/ positionViewDirection.negate().reflect( transformedNormalView );
const reflectVector = /*#__PURE__*/ reflectView.transformDirection( cameraViewMatrix ).toVar( 'reflectVector' );

class CubeTextureNode extends TextureNode {

	constructor( value, uvNode = null, levelNode = null, biasNode = null ) {

		super( value, uvNode, levelNode, biasNode );

		this.isCubeTextureNode = true;

	}

	getInputType( /*builder*/ ) {

		return 'cubeTexture';

	}

	getDefaultUV() {

		return reflectVector;

	}

	setUpdateMatrix( /*updateMatrix*/ ) { } // Ignore .updateMatrix for CubeTextureNode

	setupUV( builder, uvNode ) {

		const texture = this.value;

		if ( builder.renderer.coordinateSystem === WebGPUCoordinateSystem || ! texture.isRenderTargetTexture ) {

			return vec3( uvNode.x.negate(), uvNode.yz );

		} else {

			return uvNode;

		}

	}

	generateUV( builder, cubeUV ) {

		return cubeUV.build( builder, 'vec3' );

	}

}

const cubeTexture = nodeProxy( CubeTextureNode );

addNodeElement( 'cubeTexture', cubeTexture );

addNodeClass( 'CubeTextureNode', CubeTextureNode );

class LightingNode extends Node {

	constructor() {

		super( 'vec3' );

		this.isLightingNode = true;

	}

	generate( /*builder*/ ) {

		console.warn( 'Abstract function.' );

	}

}

addNodeClass( 'LightingNode', LightingNode );

let overrideMaterial = null;

class AnalyticLightNode extends LightingNode {

	constructor( light = null ) {

		super();

		this.updateType = NodeUpdateType.FRAME;

		this.light = light;

		this.rtt = null;
		this.shadowNode = null;
		this.shadowMaskNode = null;

		this.color = new Color();
		this._defaultColorNode = uniform( this.color );

		this.colorNode = this._defaultColorNode;

		this.isAnalyticLightNode = true;

	}

	getCacheKey() {

		return super.getCacheKey() + '-' + ( this.light.id + '-' + ( this.light.castShadow ? '1' : '0' ) );

	}

	getHash() {

		return this.light.uuid;

	}

	setupShadow( builder ) {

		const { object } = builder;

		if ( object.receiveShadow === false ) return;

		let shadowNode = this.shadowNode;

		if ( shadowNode === null ) {

			if ( overrideMaterial === null ) {

				overrideMaterial = builder.createNodeMaterial();
				overrideMaterial.fragmentNode = vec4( 0, 0, 0, 1 );
				overrideMaterial.isShadowNodeMaterial = true; // Use to avoid other overrideMaterial override material.fragmentNode unintentionally when using material.shadowNode

			}

			const shadow = this.light.shadow;
			const rtt = builder.createRenderTarget( shadow.mapSize.width, shadow.mapSize.height );

			const depthTexture = new DepthTexture();
			depthTexture.minFilter = NearestFilter;
			depthTexture.magFilter = NearestFilter;
			depthTexture.image.width = shadow.mapSize.width;
			depthTexture.image.height = shadow.mapSize.height;
			depthTexture.compareFunction = LessCompare;

			rtt.depthTexture = depthTexture;

			shadow.camera.updateProjectionMatrix();

			//

			const shadowIntensity = reference( 'intensity', 'float', shadow );
			const bias = reference( 'bias', 'float', shadow );
			const normalBias = reference( 'normalBias', 'float', shadow );

			const position = object.material.shadowPositionNode || positionWorld;

			let shadowCoord = uniform( shadow.matrix ).mul( position.add( normalWorld.mul( normalBias ) ) );
			shadowCoord = shadowCoord.xyz.div( shadowCoord.w );

			const frustumTest = shadowCoord.x.greaterThanEqual( 0 )
				.and( shadowCoord.x.lessThanEqual( 1 ) )
				.and( shadowCoord.y.greaterThanEqual( 0 ) )
				.and( shadowCoord.y.lessThanEqual( 1 ) )
				.and( shadowCoord.z.lessThanEqual( 1 ) );

			let coordZ = shadowCoord.z.add( bias );

			if ( builder.renderer.coordinateSystem === WebGPUCoordinateSystem ) {

				coordZ = coordZ.mul( 2 ).sub( 1 ); // WebGPU: Convertion [ 0, 1 ] to [ - 1, 1 ]

			}

			shadowCoord = vec3(
				shadowCoord.x,
				shadowCoord.y.oneMinus(), // follow webgpu standards
				coordZ
			);

			const textureCompare = ( depthTexture, shadowCoord, compare ) => texture( depthTexture, shadowCoord ).compare( compare );
			//const textureCompare = ( depthTexture, shadowCoord, compare ) => compare.step( texture( depthTexture, shadowCoord ) );

			// BasicShadowMap

			shadowNode = textureCompare( depthTexture, shadowCoord.xy, shadowCoord.z );

			// PCFShadowMap
			/*
			const mapSize = reference( 'mapSize', 'vec2', shadow );
			const radius = reference( 'radius', 'float', shadow );

			const texelSize = vec2( 1 ).div( mapSize );
			const dx0 = texelSize.x.negate().mul( radius );
			const dy0 = texelSize.y.negate().mul( radius );
			const dx1 = texelSize.x.mul( radius );
			const dy1 = texelSize.y.mul( radius );
			const dx2 = dx0.mul( 2 );
			const dy2 = dy0.mul( 2 );
			const dx3 = dx1.mul( 2 );
			const dy3 = dy1.mul( 2 );

			shadowNode = add(
				textureCompare( depthTexture, shadowCoord.xy.add( vec2( dx0, dy0 ) ), shadowCoord.z ),
				textureCompare( depthTexture, shadowCoord.xy.add( vec2( 0, dy0 ) ), shadowCoord.z ),
				textureCompare( depthTexture, shadowCoord.xy.add( vec2( dx1, dy0 ) ), shadowCoord.z ),
				textureCompare( depthTexture, shadowCoord.xy.add( vec2( dx2, dy2 ) ), shadowCoord.z ),
				textureCompare( depthTexture, shadowCoord.xy.add( vec2( 0, dy2 ) ), shadowCoord.z ),
				textureCompare( depthTexture, shadowCoord.xy.add( vec2( dx3, dy2 ) ), shadowCoord.z ),
				textureCompare( depthTexture, shadowCoord.xy.add( vec2( dx0, 0 ) ), shadowCoord.z ),
				textureCompare( depthTexture, shadowCoord.xy.add( vec2( dx2, 0 ) ), shadowCoord.z ),
				textureCompare( depthTexture, shadowCoord.xy, shadowCoord.z ),
				textureCompare( depthTexture, shadowCoord.xy.add( vec2( dx3, 0 ) ), shadowCoord.z ),
				textureCompare( depthTexture, shadowCoord.xy.add( vec2( dx1, 0 ) ), shadowCoord.z ),
				textureCompare( depthTexture, shadowCoord.xy.add( vec2( dx2, dy3 ) ), shadowCoord.z ),
				textureCompare( depthTexture, shadowCoord.xy.add( vec2( 0, dy3 ) ), shadowCoord.z ),
				textureCompare( depthTexture, shadowCoord.xy.add( vec2( dx3, dy3 ) ), shadowCoord.z ),
				textureCompare( depthTexture, shadowCoord.xy.add( vec2( dx0, dy1 ) ), shadowCoord.z ),
				textureCompare( depthTexture, shadowCoord.xy.add( vec2( 0, dy1 ) ), shadowCoord.z ),
				textureCompare( depthTexture, shadowCoord.xy.add( vec2( dx1, dy1 ) ), shadowCoord.z )
			).mul( 1 / 17 );
			 */
			//

			const shadowColor = texture( rtt.texture, shadowCoord );
			const shadowMaskNode = frustumTest.mix( 1, shadowNode.mix( shadowColor.a.mix( 1, shadowColor ), 1 ) );

			this.rtt = rtt;
			this.colorNode = this.colorNode.mul( mix( 1, shadowMaskNode, shadowIntensity ) );

			this.shadowNode = shadowNode;
			this.shadowMaskNode = shadowMaskNode;

			//

			this.updateBeforeType = NodeUpdateType.RENDER;

		}

	}

	setup( builder ) {

		if ( this.light.castShadow ) this.setupShadow( builder );
		else if ( this.shadowNode !== null ) this.disposeShadow();

	}

	updateShadow( frame ) {

		const { rtt, light } = this;
		const { renderer, scene, camera } = frame;

		const currentOverrideMaterial = scene.overrideMaterial;

		scene.overrideMaterial = overrideMaterial;

		rtt.setSize( light.shadow.mapSize.width, light.shadow.mapSize.height );

		light.shadow.updateMatrices( light );
		light.shadow.camera.layers.mask = camera.layers.mask;

		const currentToneMapping = renderer.toneMapping;
		const currentRenderTarget = renderer.getRenderTarget();
		const currentRenderObjectFunction = renderer.getRenderObjectFunction();

		renderer.setRenderObjectFunction( ( object, ...params ) => {

			if ( object.castShadow === true ) {

				renderer.renderObject( object, ...params );

			}

		} );

		renderer.setRenderTarget( rtt );
		renderer.toneMapping = NoToneMapping;

		renderer.render( scene, light.shadow.camera );

		renderer.setRenderTarget( currentRenderTarget );
		renderer.setRenderObjectFunction( currentRenderObjectFunction );

		renderer.toneMapping = currentToneMapping;

		scene.overrideMaterial = currentOverrideMaterial;

	}

	disposeShadow() {

		this.rtt.dispose();

		this.shadowNode = null;
		this.shadowMaskNode = null;
		this.rtt = null;

		this.colorNode = this._defaultColorNode;

	}

	updateBefore( frame ) {

		const { light } = this;

		if ( light.castShadow ) this.updateShadow( frame );

	}

	update( /*frame*/ ) {

		const { light } = this;

		this.color.copy( light.color ).multiplyScalar( light.intensity );

	}

}

addNodeClass( 'AnalyticLightNode', AnalyticLightNode );

const LightNodes = new WeakMap();

const sortLights = ( lights ) => {

	return lights.sort( ( a, b ) => a.id - b.id );

};

class LightsNode extends Node {

	constructor( lightNodes = [] ) {

		super( 'vec3' );

		this.totalDiffuseNode = vec3().temp( 'totalDiffuse' );
		this.totalSpecularNode = vec3().temp( 'totalSpecular' );

		this.outgoingLightNode = vec3().temp( 'outgoingLight' );

		this.lightNodes = lightNodes;

		this._hash = null;

	}

	get hasLight() {

		return this.lightNodes.length > 0;

	}

	getHash() {

		if ( this._hash === null ) {

			const hash = [];

			for ( const lightNode of this.lightNodes ) {

				hash.push( lightNode.getHash() );

			}

			this._hash = 'lights-' + hash.join( ',' );

		}

		return this._hash;

	}

	analyze( builder ) {

		const properties = builder.getDataFromNode( this );

		for ( const node of properties.nodes ) {

			node.build( builder );

		}

	}

	setup( builder ) {

		const context = builder.context;
		const lightingModel = context.lightingModel;

		let outgoingLightNode = this.outgoingLightNode;

		if ( lightingModel ) {

			const { lightNodes, totalDiffuseNode, totalSpecularNode } = this;

			context.outgoingLight = outgoingLightNode;

			const stack = builder.addStack();

			//

			const properties = builder.getDataFromNode( this );
			properties.nodes = stack.nodes;

			//

			lightingModel.start( context, stack, builder );

			// lights

			for ( const lightNode of lightNodes ) {

				lightNode.build( builder );

			}

			//

			lightingModel.indirectDiffuse( context, stack, builder );
			lightingModel.indirectSpecular( context, stack, builder );
			lightingModel.ambientOcclusion( context, stack, builder );

			//

			const { backdrop, backdropAlpha } = context;
			const { directDiffuse, directSpecular, indirectDiffuse, indirectSpecular } = context.reflectedLight;

			let totalDiffuse = directDiffuse.add( indirectDiffuse );

			if ( backdrop !== null ) {

				if ( backdropAlpha !== null ) {

					totalDiffuse = vec3( backdropAlpha.mix( totalDiffuse, backdrop ) );

				} else {

					totalDiffuse = vec3( backdrop );

				}

				context.material.transparent = true;

			}

			totalDiffuseNode.assign( totalDiffuse );
			totalSpecularNode.assign( directSpecular.add( indirectSpecular ) );

			outgoingLightNode.assign( totalDiffuseNode.add( totalSpecularNode ) );

			//

			lightingModel.finish( context, stack, builder );

			//

			outgoingLightNode = outgoingLightNode.bypass( builder.removeStack() );

		}

		return outgoingLightNode;

	}

	_getLightNodeById( id ) {

		for ( const lightNode of this.lightNodes ) {

			if ( lightNode.isAnalyticLightNode && lightNode.light.id === id ) {

				return lightNode;

			}

		}

		return null;

	}

	fromLights( lights = [] ) {

		const lightNodes = [];

		lights = sortLights( lights );

		for ( const light of lights ) {

			let lightNode = this._getLightNodeById( light.id );

			if ( lightNode === null ) {

				const lightClass = light.constructor;
				const lightNodeClass = LightNodes.has( lightClass ) ? LightNodes.get( lightClass ) : AnalyticLightNode;

				lightNode = nodeObject( new lightNodeClass( light ) );

			}

			lightNodes.push( lightNode );

		}

		this.lightNodes = lightNodes;
		this._hash = null;

		return this;

	}

}

const lights = ( lights ) => nodeObject( new LightsNode().fromLights( lights ) );
const lightsNode = nodeProxy( LightsNode );

function addLightNode( lightClass, lightNodeClass ) {

	if ( LightNodes.has( lightClass ) ) {

		console.warn( `Redefinition of light node ${ lightNodeClass.type }` );
		return;

	}

	if ( typeof lightClass !== 'function' ) throw new Error( `Light ${ lightClass.name } is not a class` );
	if ( typeof lightNodeClass !== 'function' || ! lightNodeClass.type ) throw new Error( `Light node ${ lightNodeClass.type } is not a class` );

	LightNodes.set( lightClass, lightNodeClass );

}

class AONode extends LightingNode {

	constructor( aoNode = null ) {

		super();

		this.aoNode = aoNode;

	}

	setup( builder ) {

		const aoIntensity = 1;
		const aoNode = this.aoNode.x.sub( 1.0 ).mul( aoIntensity ).add( 1.0 );

		builder.context.ambientOcclusion.mulAssign( aoNode );

	}

}

addNodeClass( 'AONode', AONode );

class LightingContextNode extends ContextNode {

	constructor( node, lightingModel = null, backdropNode = null, backdropAlphaNode = null ) {

		super( node );

		this.lightingModel = lightingModel;
		this.backdropNode = backdropNode;
		this.backdropAlphaNode = backdropAlphaNode;

		this._context = null;

	}

	getContext() {

		const { backdropNode, backdropAlphaNode } = this;

		const directDiffuse = vec3().temp( 'directDiffuse' ),
			directSpecular = vec3().temp( 'directSpecular' ),
			indirectDiffuse = vec3().temp( 'indirectDiffuse' ),
			indirectSpecular = vec3().temp( 'indirectSpecular' );

		const reflectedLight = {
			directDiffuse,
			directSpecular,
			indirectDiffuse,
			indirectSpecular
		};

		const context = {
			radiance: vec3().temp( 'radiance' ),
			irradiance: vec3().temp( 'irradiance' ),
			iblIrradiance: vec3().temp( 'iblIrradiance' ),
			ambientOcclusion: float( 1 ).temp( 'ambientOcclusion' ),
			reflectedLight,
			backdrop: backdropNode,
			backdropAlpha: backdropAlphaNode
		};

		return context;

	}

	setup( builder ) {

		this.context = this._context || ( this._context = this.getContext() );
		this.context.lightingModel = this.lightingModel || builder.context.lightingModel;

		return super.setup( builder );

	}

}

const lightingContext = nodeProxy( LightingContextNode );

addNodeElement( 'lightingContext', lightingContext );

addNodeClass( 'LightingContextNode', LightingContextNode );

class IrradianceNode extends LightingNode {

	constructor( node ) {

		super();

		this.node = node;

	}

	setup( builder ) {

		builder.context.irradiance.addAssign( this.node );

	}

}

addNodeClass( 'IrradianceNode', IrradianceNode );

let resolution, viewportResult;

class ViewportNode extends Node {

	constructor( scope ) {

		super();

		this.scope = scope;

		this.isViewportNode = true;

	}

	getNodeType() {

		if ( this.scope === ViewportNode.VIEWPORT ) return 'vec4';
		else if ( this.scope === ViewportNode.COORDINATE ) return 'vec3';
		else return 'vec2';

	}

	getUpdateType() {

		let updateType = NodeUpdateType.NONE;

		if ( this.scope === ViewportNode.RESOLUTION || this.scope === ViewportNode.VIEWPORT ) {

			updateType = NodeUpdateType.RENDER;

		}

		this.updateType = updateType;

		return updateType;

	}

	update( { renderer } ) {

		if ( this.scope === ViewportNode.VIEWPORT ) {

			renderer.getViewport( viewportResult );

		} else {

			renderer.getDrawingBufferSize( resolution );

		}

	}

	setup( /*builder*/ ) {

		const scope = this.scope;

		let output = null;

		if ( scope === ViewportNode.RESOLUTION ) {

			output = uniform( resolution || ( resolution = new Vector2() ) );

		} else if ( scope === ViewportNode.VIEWPORT ) {

			output = uniform( viewportResult || ( viewportResult = new Vector4() ) );

		} else {

			output = viewportCoordinate.div( viewportResolution );

			let outX = output.x;
			let outY = output.y;

			if ( /bottom/i.test( scope ) ) outY = outY.oneMinus();
			if ( /right/i.test( scope ) ) outX = outX.oneMinus();

			output = vec2( outX, outY );

		}

		return output;

	}

	generate( builder ) {

		if ( this.scope === ViewportNode.COORDINATE ) {

			let coord = builder.getFragCoord();

			if ( builder.isFlipY() ) {

				// follow webgpu standards

				const resolution = builder.getNodeProperties( viewportResolution ).outputNode.build( builder );

				coord = `${ builder.getType( 'vec3' ) }( ${ coord }.x, ${ resolution }.y - ${ coord }.y, ${ coord }.z )`;

			}

			return coord;

		}

		return super.generate( builder );

	}

}

ViewportNode.COORDINATE = 'coordinate';
ViewportNode.RESOLUTION = 'resolution';
ViewportNode.VIEWPORT = 'viewport';
ViewportNode.TOP_LEFT = 'topLeft';
ViewportNode.BOTTOM_LEFT = 'bottomLeft';
ViewportNode.TOP_RIGHT = 'topRight';
ViewportNode.BOTTOM_RIGHT = 'bottomRight';

const viewportCoordinate = nodeImmutable( ViewportNode, ViewportNode.COORDINATE );
const viewportResolution = nodeImmutable( ViewportNode, ViewportNode.RESOLUTION );
const viewport = nodeImmutable( ViewportNode, ViewportNode.VIEWPORT );
const viewportTopLeft = nodeImmutable( ViewportNode, ViewportNode.TOP_LEFT );
const viewportBottomLeft = nodeImmutable( ViewportNode, ViewportNode.BOTTOM_LEFT );
const viewportTopRight = nodeImmutable( ViewportNode, ViewportNode.TOP_RIGHT );
const viewportBottomRight = nodeImmutable( ViewportNode, ViewportNode.BOTTOM_RIGHT );

addNodeClass( 'ViewportNode', ViewportNode );

const _size$5 = new Vector2();

class ViewportTextureNode extends TextureNode {

	constructor( uvNode = viewportTopLeft, levelNode = null, framebufferTexture = null ) {

		if ( framebufferTexture === null ) {

			framebufferTexture = new FramebufferTexture();
			framebufferTexture.minFilter = LinearMipmapLinearFilter;

		}

		super( framebufferTexture, uvNode, levelNode );

		this.generateMipmaps = false;

		this.isOutputTextureNode = true;

		this.updateBeforeType = NodeUpdateType.FRAME;

	}

	updateBefore( frame ) {

		const renderer = frame.renderer;
		renderer.getDrawingBufferSize( _size$5 );

		//

		const framebufferTexture = this.value;

		if ( framebufferTexture.image.width !== _size$5.width || framebufferTexture.image.height !== _size$5.height ) {

			framebufferTexture.image.width = _size$5.width;
			framebufferTexture.image.height = _size$5.height;
			framebufferTexture.needsUpdate = true;

		}

		//

		const currentGenerateMipmaps = framebufferTexture.generateMipmaps;
		framebufferTexture.generateMipmaps = this.generateMipmaps;

		renderer.copyFramebufferToTexture( framebufferTexture );

		framebufferTexture.generateMipmaps = currentGenerateMipmaps;

	}

	clone() {

		const viewportTextureNode = new this.constructor( this.uvNode, this.levelNode, this.value );
		viewportTextureNode.generateMipmaps = this.generateMipmaps;

		return viewportTextureNode;

	}

}

const viewportTexture = nodeProxy( ViewportTextureNode );
const viewportMipTexture = nodeProxy( ViewportTextureNode, null, null, { generateMipmaps: true } );

addNodeElement( 'viewportTexture', viewportTexture );
addNodeElement( 'viewportMipTexture', viewportMipTexture );

addNodeClass( 'ViewportTextureNode', ViewportTextureNode );

let sharedDepthbuffer = null;

class ViewportDepthTextureNode extends ViewportTextureNode {

	constructor( uvNode = viewportTopLeft, levelNode = null ) {

		if ( sharedDepthbuffer === null ) {

			sharedDepthbuffer = new DepthTexture();

		}

		super( uvNode, levelNode, sharedDepthbuffer );

	}

}

const viewportDepthTexture = nodeProxy( ViewportDepthTextureNode );

addNodeElement( 'viewportDepthTexture', viewportDepthTexture );

addNodeClass( 'ViewportDepthTextureNode', ViewportDepthTextureNode );

class ViewportDepthNode extends Node {

	constructor( scope, valueNode = null ) {

		super( 'float' );

		this.scope = scope;
		this.valueNode = valueNode;

		this.isViewportDepthNode = true;

	}

	generate( builder ) {

		const { scope } = this;

		if ( scope === ViewportDepthNode.DEPTH ) {

			return builder.getFragDepth();

		}

		return super.generate( builder );

	}

	setup( { camera } ) {

		const { scope } = this;
		const texture = this.valueNode;

		let node = null;

		if ( scope === ViewportDepthNode.DEPTH ) {

			if ( texture !== null ) {

 				node = depthBase().assign( texture );

			} else {

				if ( camera.isPerspectiveCamera ) {

					node = viewZToPerspectiveDepth( positionView.z, cameraNear, cameraFar );

				} else {

					node = viewZToOrthographicDepth( positionView.z, cameraNear, cameraFar );

				}

			}

		} else if ( scope === ViewportDepthNode.LINEAR_DEPTH ) {

			if ( texture !== null ) {

				if ( camera.isPerspectiveCamera ) {

					const viewZ = perspectiveDepthToViewZ( texture, cameraNear, cameraFar );

					node = viewZToOrthographicDepth( viewZ, cameraNear, cameraFar );

				} else {

					node = texture;

				}

			} else {

				node = viewZToOrthographicDepth( positionView.z, cameraNear, cameraFar );

			}

		}

		return node;

	}

}

// NOTE: viewZ, the z-coordinate in camera space, is negative for points in front of the camera

// -near maps to 0; -far maps to 1
const viewZToOrthographicDepth = ( viewZ, near, far ) => viewZ.add( near ).div( near.sub( far ) );

// maps orthographic depth in [ 0, 1 ] to viewZ
const orthographicDepthToViewZ = ( depth, near, far ) => near.sub( far ).mul( depth ).sub( near );

// NOTE: https://twitter.com/gonnavis/status/1377183786949959682

// -near maps to 0; -far maps to 1
const viewZToPerspectiveDepth = ( viewZ, near, far ) => near.add( viewZ ).mul( far ).div( far.sub( near ).mul( viewZ ) );

// maps perspective depth in [ 0, 1 ] to viewZ
const perspectiveDepthToViewZ = ( depth, near, far ) => near.mul( far ).div( far.sub( near ).mul( depth ).sub( far ) );

ViewportDepthNode.DEPTH = 'depth';
ViewportDepthNode.LINEAR_DEPTH = 'linearDepth';

const depthBase = nodeProxy( ViewportDepthNode, ViewportDepthNode.DEPTH );

const depth = nodeImmutable( ViewportDepthNode, ViewportDepthNode.DEPTH );
const linearDepth = nodeProxy( ViewportDepthNode, ViewportDepthNode.LINEAR_DEPTH );
const viewportLinearDepth = linearDepth( viewportDepthTexture() );

depth.assign = ( value ) => depthBase( value );

addNodeClass( 'ViewportDepthNode', ViewportDepthNode );

class ClippingNode extends Node {

	constructor( scope = ClippingNode.DEFAULT ) {

		super();

		this.scope = scope;

	}

	setup( builder ) {

		super.setup( builder );

		const clippingContext = builder.clippingContext;
		const { localClipIntersection, localClippingCount, globalClippingCount } = clippingContext;

		const numClippingPlanes = globalClippingCount + localClippingCount;
		const numUnionClippingPlanes = localClipIntersection ? numClippingPlanes - localClippingCount : numClippingPlanes;

		if ( this.scope === ClippingNode.ALPHA_TO_COVERAGE ) {

			return this.setupAlphaToCoverage( clippingContext.planes, numClippingPlanes, numUnionClippingPlanes );

		} else {

			return this.setupDefault( clippingContext.planes, numClippingPlanes, numUnionClippingPlanes );

		}

	}

	setupAlphaToCoverage( planes, numClippingPlanes, numUnionClippingPlanes ) {

		return tslFn( () => {

			const clippingPlanes = uniforms( planes );

			const distanceToPlane = property( 'float', 'distanceToPlane' );
			const distanceGradient = property( 'float', 'distanceToGradient' );

			const clipOpacity = property( 'float', 'clipOpacity' );

			clipOpacity.assign( 1 );

			let plane;

			loop( numUnionClippingPlanes, ( { i } ) => {

				plane = clippingPlanes.element( i );

				distanceToPlane.assign( positionView.dot( plane.xyz ).negate().add( plane.w ) );
				distanceGradient.assign( distanceToPlane.fwidth().div( 2.0 ) );

				clipOpacity.mulAssign( smoothstep( distanceGradient.negate(), distanceGradient, distanceToPlane ) );

				clipOpacity.equal( 0.0 ).discard();

			} );

			if ( numUnionClippingPlanes < numClippingPlanes ) {

				const unionClipOpacity = property( 'float', 'unionclipOpacity' );

				unionClipOpacity.assign( 1 );

				loop( { start: numUnionClippingPlanes, end: numClippingPlanes }, ( { i } ) => {

					plane = clippingPlanes.element( i );

					distanceToPlane.assign( positionView.dot( plane.xyz ).negate().add( plane.w ) );
					distanceGradient.assign( distanceToPlane.fwidth().div( 2.0 ) );

					unionClipOpacity.mulAssign( smoothstep( distanceGradient.negate(), distanceGradient, distanceToPlane ).oneMinus() );

				} );

				clipOpacity.mulAssign( unionClipOpacity.oneMinus() );

			}

			diffuseColor.a.mulAssign( clipOpacity );

			diffuseColor.a.equal( 0.0 ).discard();

		} )();

	}

	setupDefault( planes, numClippingPlanes, numUnionClippingPlanes ) {

		return tslFn( () => {

			const clippingPlanes = uniforms( planes );

			let plane;

			loop( numUnionClippingPlanes, ( { i } ) => {

				plane = clippingPlanes.element( i );
				positionView.dot( plane.xyz ).greaterThan( plane.w ).discard();

			} );

			if ( numUnionClippingPlanes < numClippingPlanes ) {

				const clipped = property( 'bool', 'clipped' );

				clipped.assign( true );

				loop( { start: numUnionClippingPlanes, end: numClippingPlanes }, ( { i } ) => {

					plane = clippingPlanes.element( i );
					clipped.assign( positionView.dot( plane.xyz ).greaterThan( plane.w ).and( clipped ) );

				} );

				clipped.discard();

			}

		} )();

	}

}

ClippingNode.ALPHA_TO_COVERAGE = 'alphaToCoverage';
ClippingNode.DEFAULT = 'default';

const clipping = () => nodeObject( new ClippingNode() );

const clippingAlpha = () => nodeObject( new ClippingNode( ClippingNode.ALPHA_TO_COVERAGE ) );

class FrontFacingNode extends Node {

	constructor() {

		super( 'bool' );

		this.isFrontFacingNode = true;

	}

	generate( builder ) {

		const { renderer, material } = builder;

		if ( renderer.coordinateSystem === WebGLCoordinateSystem ) {

			if ( material.side === BackSide ) {

				return 'false';

			}

		}

		return builder.getFrontFacing();

	}

}

const frontFacing = nodeImmutable( FrontFacingNode );
const faceDirection = float( frontFacing ).mul( 2.0 ).sub( 1.0 );

addNodeClass( 'FrontFacingNode', FrontFacingNode );

const NodeMaterials = new Map();

class NodeMaterial extends Material {

	constructor() {

		super();

		this.isNodeMaterial = true;

		this.type = this.constructor.type;

		this.forceSinglePass = false;

		this.fog = true;
		this.lights = true;
		this.normals = true;

		this.lightsNode = null;
		this.envNode = null;
		this.aoNode = null;

		this.colorNode = null;
		this.normalNode = null;
		this.opacityNode = null;
		this.backdropNode = null;
		this.backdropAlphaNode = null;
		this.alphaTestNode = null;

		this.positionNode = null;

		this.depthNode = null;
		this.shadowNode = null;
		this.shadowPositionNode = null;

		this.outputNode = null;

		this.fragmentNode = null;
		this.vertexNode = null;

	}

	customProgramCacheKey() {

		return this.type + getCacheKey( this );

	}

	build( builder ) {

		this.setup( builder );

	}

	setup( builder ) {

		// < VERTEX STAGE >

		builder.addStack();

		builder.stack.outputNode = this.vertexNode || this.setupPosition( builder );

		builder.addFlow( 'vertex', builder.removeStack() );

		// < FRAGMENT STAGE >

		builder.addStack();

		let resultNode;

		const clippingNode = this.setupClipping( builder );

		if ( this.depthWrite === true ) this.setupDepth( builder );

		if ( this.fragmentNode === null ) {

			if ( this.normals === true ) this.setupNormal( builder );

			this.setupDiffuseColor( builder );
			this.setupVariants( builder );

			const outgoingLightNode = this.setupLighting( builder );

			if ( clippingNode !== null ) builder.stack.add( clippingNode );

			// force unsigned floats - useful for RenderTargets

			const basicOutput = vec4( outgoingLightNode, diffuseColor.a ).max( 0 );

			resultNode = this.setupOutput( builder, basicOutput );

			// OUTPUT NODE

			output.assign( resultNode );

			//

			if ( this.outputNode !== null ) resultNode = this.outputNode;

		} else {

			let fragmentNode = this.fragmentNode;

			if ( fragmentNode.isOutputStructNode !== true ) {

				fragmentNode = vec4( fragmentNode );

			}

			resultNode = this.setupOutput( builder, fragmentNode );

		}

		builder.stack.outputNode = resultNode;

		builder.addFlow( 'fragment', builder.removeStack() );

	}

	setupClipping( builder ) {

		if ( builder.clippingContext === null ) return null;

		const { globalClippingCount, localClippingCount } = builder.clippingContext;

		let result = null;

		if ( globalClippingCount || localClippingCount ) {

			if ( this.alphaToCoverage ) {

				// to be added to flow when the color/alpha value has been determined
				result = clippingAlpha();

			} else {

				builder.stack.add( clipping() );

			}

		}

		return result;

	}

	setupDepth( builder ) {

		const { renderer } = builder;

		// Depth

		let depthNode = this.depthNode;

		if ( depthNode === null && renderer.logarithmicDepthBuffer === true ) {

			const fragDepth = modelViewProjection().w.add( 1 );

			depthNode = fragDepth.log2().mul( cameraLogDepth ).mul( 0.5 );

		}

		if ( depthNode !== null ) {

			depth.assign( depthNode ).append();

		}

	}

	setupPosition( builder ) {

		const { object } = builder;
		const geometry = object.geometry;

		builder.addStack();

		// Vertex

		if ( geometry.morphAttributes.position || geometry.morphAttributes.normal || geometry.morphAttributes.color ) {

			morphReference( object ).append();

		}

		if ( object.isSkinnedMesh === true ) {

			skinningReference( object ).append();

		}

		if ( this.displacementMap ) {

			const displacementMap = materialReference( 'displacementMap', 'texture' );
			const displacementScale = materialReference( 'displacementScale', 'float' );
			const displacementBias = materialReference( 'displacementBias', 'float' );

			positionLocal.addAssign( normalLocal.normalize().mul( ( displacementMap.x.mul( displacementScale ).add( displacementBias ) ) ) );

		}

		if ( object.isBatchedMesh ) {

			batch( object ).append();

		}

		if ( ( object.instanceMatrix && object.instanceMatrix.isInstancedBufferAttribute === true ) ) {

			instance( object ).append();

		}

		if ( this.positionNode !== null ) {

			positionLocal.assign( this.positionNode );

		}

		const mvp = modelViewProjection();

		builder.context.vertex = builder.removeStack();
		builder.context.mvp = mvp;

		return mvp;

	}

	setupDiffuseColor( { object, geometry } ) {

		let colorNode = this.colorNode ? vec4( this.colorNode ) : materialColor;

		// VERTEX COLORS

		if ( this.vertexColors === true && geometry.hasAttribute( 'color' ) ) {

			colorNode = vec4( colorNode.xyz.mul( attribute( 'color', 'vec3' ) ), colorNode.a );

		}

		// Instanced colors

		if ( object.instanceColor ) {

			const instanceColor = varyingProperty( 'vec3', 'vInstanceColor' );

			colorNode = instanceColor.mul( colorNode );

		}

		// COLOR

		diffuseColor.assign( colorNode );

		// OPACITY

		const opacityNode = this.opacityNode ? float( this.opacityNode ) : materialOpacity;
		diffuseColor.a.assign( diffuseColor.a.mul( opacityNode ) );

		// ALPHA TEST

		if ( this.alphaTestNode !== null || this.alphaTest > 0 ) {

			const alphaTestNode = this.alphaTestNode !== null ? float( this.alphaTestNode ) : materialAlphaTest;

			diffuseColor.a.lessThanEqual( alphaTestNode ).discard();

		}

		if ( this.transparent === false && this.blending === NormalBlending && this.alphaToCoverage === false ) {

			diffuseColor.a.assign( 1.0 );

		}

	}

	setupVariants( /*builder*/ ) {

		// Interface function.

	}

	setupNormal() {

		// NORMAL VIEW

		if ( this.flatShading === true ) {

			const normalNode = positionView.dFdx().cross( positionView.dFdy() ).normalize();

			transformedNormalView.assign( normalNode.mul( faceDirection ) );

		} else {

			const normalNode = this.normalNode ? vec3( this.normalNode ) : materialNormal;

			transformedNormalView.assign( normalNode.mul( faceDirection ) );

		}

	}

	setupEnvironment( builder ) {

		let node = null;

		if ( this.envNode ) {

			node = this.envNode;

		} else if ( this.envMap ) {

			node = this.envMap.isCubeTexture ? cubeTexture( this.envMap ) : texture( this.envMap );

		} else if ( builder.environmentNode ) {

			node = builder.environmentNode;

		}

		return node;

	}

	setupLights( builder ) {

		const materialLightsNode = [];

		//

		const envNode = this.setupEnvironment( builder );

		if ( envNode && envNode.isLightingNode ) {

			materialLightsNode.push( envNode );

		}

		if ( builder.material.lightMap ) {

			materialLightsNode.push( new IrradianceNode( materialReference( 'lightMap', 'texture' ) ) );

		}

		if ( this.aoNode !== null || builder.material.aoMap ) {

			const aoNode = this.aoNode !== null ? this.aoNode : texture( builder.material.aoMap );

			materialLightsNode.push( new AONode( aoNode ) );

		}

		let lightsN = this.lightsNode || builder.lightsNode;

		if ( materialLightsNode.length > 0 ) {

			lightsN = lightsNode( [ ...lightsN.lightNodes, ...materialLightsNode ] );

		}

		return lightsN;

	}

	setupLightingModel( /*builder*/ ) {

		// Interface function.

	}

	setupLighting( builder ) {

		const { material } = builder;
		const { backdropNode, backdropAlphaNode, emissiveNode } = this;

		// OUTGOING LIGHT

		const lights = this.lights === true || this.lightsNode !== null;

		const lightsNode = lights ? this.setupLights( builder ) : null;

		let outgoingLightNode = diffuseColor.rgb;

		if ( lightsNode && lightsNode.hasLight !== false ) {

			const lightingModel = this.setupLightingModel( builder );

			outgoingLightNode = lightingContext( lightsNode, lightingModel, backdropNode, backdropAlphaNode );

		} else if ( backdropNode !== null ) {

			outgoingLightNode = vec3( backdropAlphaNode !== null ? mix( outgoingLightNode, backdropNode, backdropAlphaNode ) : backdropNode );

		}

		// EMISSIVE

		if ( ( emissiveNode && emissiveNode.isNode === true ) || ( material.emissive && material.emissive.isColor === true ) ) {

			outgoingLightNode = outgoingLightNode.add( vec3( emissiveNode ? emissiveNode : materialEmissive ) );

		}

		return outgoingLightNode;

	}

	setupOutput( builder, outputNode ) {

		// FOG

		if ( this.fog === true ) {

			const fogNode = builder.fogNode;

			if ( fogNode ) outputNode = vec4( fogNode.mix( outputNode.rgb, fogNode.colorNode ), outputNode.a );

		}

		return outputNode;

	}

	setDefaultValues( material ) {

		// This approach is to reuse the native refreshUniforms*
		// and turn available the use of features like transmission and environment in core

		for ( const property in material ) {

			const value = material[ property ];

			if ( this[ property ] === undefined ) {

				this[ property ] = value;

				if ( value && value.clone ) this[ property ] = value.clone();

			}

		}

		const descriptors = Object.getOwnPropertyDescriptors( material.constructor.prototype );

		for ( const key in descriptors ) {

			if ( Object.getOwnPropertyDescriptor( this.constructor.prototype, key ) === undefined &&
			     descriptors[ key ].get !== undefined ) {

				Object.defineProperty( this.constructor.prototype, key, descriptors[ key ] );

			}

		}

	}

	toJSON( meta ) {

		const isRoot = ( meta === undefined || typeof meta === 'string' );

		if ( isRoot ) {

			meta = {
				textures: {},
				images: {},
				nodes: {}
			};

		}

		const data = Material.prototype.toJSON.call( this, meta );
		const nodeChildren = getNodeChildren( this );

		data.inputNodes = {};

		for ( const { property, childNode } of nodeChildren ) {

			data.inputNodes[ property ] = childNode.toJSON( meta ).uuid;

		}

		// TODO: Copied from Object3D.toJSON

		function extractFromCache( cache ) {

			const values = [];

			for ( const key in cache ) {

				const data = cache[ key ];
				delete data.metadata;
				values.push( data );

			}

			return values;

		}

		if ( isRoot ) {

			const textures = extractFromCache( meta.textures );
			const images = extractFromCache( meta.images );
			const nodes = extractFromCache( meta.nodes );

			if ( textures.length > 0 ) data.textures = textures;
			if ( images.length > 0 ) data.images = images;
			if ( nodes.length > 0 ) data.nodes = nodes;

		}

		return data;

	}

	copy( source ) {

		this.lightsNode = source.lightsNode;
		this.envNode = source.envNode;

		this.colorNode = source.colorNode;
		this.normalNode = source.normalNode;
		this.opacityNode = source.opacityNode;
		this.backdropNode = source.backdropNode;
		this.backdropAlphaNode = source.backdropAlphaNode;
		this.alphaTestNode = source.alphaTestNode;

		this.positionNode = source.positionNode;

		this.depthNode = source.depthNode;
		this.shadowNode = source.shadowNode;
		this.shadowPositionNode = source.shadowPositionNode;

		this.outputNode = source.outputNode;

		this.fragmentNode = source.fragmentNode;
		this.vertexNode = source.vertexNode;

		return super.copy( source );

	}

	static fromMaterial( material ) {

		if ( material.isNodeMaterial === true ) { // is already a node material

			return material;

		}

		const type = material.type.replace( 'Material', 'NodeMaterial' );

		const nodeMaterial = createNodeMaterialFromType( type );

		if ( nodeMaterial === undefined ) {

			throw new Error( `NodeMaterial: Material "${ material.type }" is not compatible.` );

		}

		for ( const key in material ) {

			nodeMaterial[ key ] = material[ key ];

		}

		return nodeMaterial;

	}

}

function addNodeMaterial( type, nodeMaterial ) {

	if ( typeof nodeMaterial !== 'function' || ! type ) throw new Error( `Node material ${ type } is not a class` );
	if ( NodeMaterials.has( type ) ) {

		console.warn( `Redefinition of node material ${ type }` );
		return;

	}

	NodeMaterials.set( type, nodeMaterial );
	nodeMaterial.type = type;

}

function createNodeMaterialFromType( type ) {

	const Material = NodeMaterials.get( type );

	if ( Material !== undefined ) {

		return new Material();

	}

}

addNodeMaterial( 'NodeMaterial', NodeMaterial );

class Uniform {

	constructor( name, value ) {

		this.name = name;
		this.value = value;

		this.boundary = 0; // used to build the uniform buffer according to the STD140 layout
		this.itemSize = 0;

		this.offset = 0; // this property is set by WebGPUUniformsGroup and marks the start position in the uniform buffer

	}

	setValue( value ) {

		this.value = value;

	}

	getValue() {

		return this.value;

	}

}

class NumberUniform extends Uniform {

	constructor( name, value = 0 ) {

		super( name, value );

		this.isNumberUniform = true;

		this.boundary = 4;
		this.itemSize = 1;

	}

}

class Vector2Uniform extends Uniform {

	constructor( name, value = new Vector2() ) {

		super( name, value );

		this.isVector2Uniform = true;

		this.boundary = 8;
		this.itemSize = 2;

	}

}

class Vector3Uniform extends Uniform {

	constructor( name, value = new Vector3() ) {

		super( name, value );

		this.isVector3Uniform = true;

		this.boundary = 16;
		this.itemSize = 3;

	}

}

class Vector4Uniform extends Uniform {

	constructor( name, value = new Vector4() ) {

		super( name, value );

		this.isVector4Uniform = true;

		this.boundary = 16;
		this.itemSize = 4;

	}

}

class ColorUniform extends Uniform {

	constructor( name, value = new Color() ) {

		super( name, value );

		this.isColorUniform = true;

		this.boundary = 16;
		this.itemSize = 3;

	}

}

class Matrix3Uniform extends Uniform {

	constructor( name, value = new Matrix3() ) {

		super( name, value );

		this.isMatrix3Uniform = true;

		this.boundary = 48;
		this.itemSize = 12;

	}

}

class Matrix4Uniform extends Uniform {

	constructor( name, value = new Matrix4() ) {

		super( name, value );

		this.isMatrix4Uniform = true;

		this.boundary = 64;
		this.itemSize = 16;

	}

}

class NumberNodeUniform extends NumberUniform {

	constructor( nodeUniform ) {

		super( nodeUniform.name, nodeUniform.value );

		this.nodeUniform = nodeUniform;

	}

	getValue() {

		return this.nodeUniform.value;

	}

}

class Vector2NodeUniform extends Vector2Uniform {

	constructor( nodeUniform ) {

		super( nodeUniform.name, nodeUniform.value );

		this.nodeUniform = nodeUniform;

	}

	getValue() {

		return this.nodeUniform.value;

	}

}

class Vector3NodeUniform extends Vector3Uniform {

	constructor( nodeUniform ) {

		super( nodeUniform.name, nodeUniform.value );

		this.nodeUniform = nodeUniform;

	}

	getValue() {

		return this.nodeUniform.value;

	}

}

class Vector4NodeUniform extends Vector4Uniform {

	constructor( nodeUniform ) {

		super( nodeUniform.name, nodeUniform.value );

		this.nodeUniform = nodeUniform;

	}

	getValue() {

		return this.nodeUniform.value;

	}

}

class ColorNodeUniform extends ColorUniform {

	constructor( nodeUniform ) {

		super( nodeUniform.name, nodeUniform.value );

		this.nodeUniform = nodeUniform;

	}

	getValue() {

		return this.nodeUniform.value;

	}

}

class Matrix3NodeUniform extends Matrix3Uniform {

	constructor( nodeUniform ) {

		super( nodeUniform.name, nodeUniform.value );

		this.nodeUniform = nodeUniform;

	}

	getValue() {

		return this.nodeUniform.value;

	}

}

class Matrix4NodeUniform extends Matrix4Uniform {

	constructor( nodeUniform ) {

		super( nodeUniform.name, nodeUniform.value );

		this.nodeUniform = nodeUniform;

	}

	getValue() {

		return this.nodeUniform.value;

	}

}

class CondNode extends Node {

	constructor( condNode, ifNode, elseNode = null ) {

		super();

		this.condNode = condNode;

		this.ifNode = ifNode;
		this.elseNode = elseNode;

	}

	getNodeType( builder ) {

		const ifType = this.ifNode.getNodeType( builder );

		if ( this.elseNode !== null ) {

			const elseType = this.elseNode.getNodeType( builder );

			if ( builder.getTypeLength( elseType ) > builder.getTypeLength( ifType ) ) {

				return elseType;

			}

		}

		return ifType;

	}

	setup( builder ) {

		const properties = builder.getNodeProperties( this );
		properties.condNode = this.condNode.cache();
		properties.ifNode = this.ifNode.cache();
		properties.elseNode = this.elseNode ? this.elseNode.cache() : null;

	}

	generate( builder, output ) {

		const type = this.getNodeType( builder );

		const nodeData = builder.getDataFromNode( this );

		if ( nodeData.nodeProperty !== undefined ) {

			return nodeData.nodeProperty;

		}

		const { condNode, ifNode, elseNode } = builder.getNodeProperties( this );

		const needsOutput = output !== 'void';
		const nodeProperty = needsOutput ? property( type ).build( builder ) : '';

		nodeData.nodeProperty = nodeProperty;

		const nodeSnippet = condNode.build( builder, 'bool' );

		builder.addFlowCode( `\n${ builder.tab }if ( ${ nodeSnippet } ) {\n\n` ).addFlowTab();

		let ifSnippet = ifNode.build( builder, type );

		if ( ifSnippet ) {

			if ( needsOutput ) {

				ifSnippet = nodeProperty + ' = ' + ifSnippet + ';';

			} else {

				ifSnippet = 'return ' + ifSnippet + ';';

			}

		}

		builder.removeFlowTab().addFlowCode( builder.tab + '\t' + ifSnippet + '\n\n' + builder.tab + '}' );

		if ( elseNode !== null ) {

			builder.addFlowCode( ' else {\n\n' ).addFlowTab();

			let elseSnippet = elseNode.build( builder, type );

			if ( elseSnippet ) {

				if ( needsOutput ) {

					elseSnippet = nodeProperty + ' = ' + elseSnippet + ';';

				} else {

					elseSnippet = 'return ' + elseSnippet + ';';

				}

			}

			builder.removeFlowTab().addFlowCode( builder.tab + '\t' + elseSnippet + '\n\n' + builder.tab + '}\n\n' );

		} else {

			builder.addFlowCode( '\n\n' );

		}

		return builder.format( nodeProperty, type, output );

	}

}

const cond = nodeProxy( CondNode );

addNodeElement( 'cond', cond );

addNodeClass( 'CondNode', CondNode );

class StackNode extends Node {

	constructor( parent = null ) {

		super();

		this.nodes = [];
		this.outputNode = null;

		this.parent = parent;

		this._currentCond = null;

		this.isStackNode = true;

	}

	getNodeType( builder ) {

		return this.outputNode ? this.outputNode.getNodeType( builder ) : 'void';

	}

	add( node ) {

		this.nodes.push( node );

		return this;

	}

	if( boolNode, method ) {

		const methodNode = new ShaderNode( method );
		this._currentCond = cond( boolNode, methodNode );

		return this.add( this._currentCond );

	}

	elseif( boolNode, method ) {

		const methodNode = new ShaderNode( method );
		const ifNode = cond( boolNode, methodNode );

		this._currentCond.elseNode = ifNode;
		this._currentCond = ifNode;

		return this;

	}

	else( method ) {

		this._currentCond.elseNode = new ShaderNode( method );

		return this;

	}

	build( builder, ...params ) {

		const previousStack = getCurrentStack();

		setCurrentStack( this );

		for ( const node of this.nodes ) {

			node.build( builder, 'void' );

		}

		setCurrentStack( previousStack );

		return this.outputNode ? this.outputNode.build( builder, ...params ) : super.build( builder, ...params );

	}

}

const stack = nodeProxy( StackNode );

addNodeClass( 'StackNode', StackNode );

class EquirectUVNode extends TempNode {

	constructor( dirNode = positionWorldDirection ) {

		super( 'vec2' );

		this.dirNode = dirNode;

	}

	setup() {

		const dir = this.dirNode;

		const u = dir.z.atan2( dir.x ).mul( 1 / ( Math.PI * 2 ) ).add( 0.5 );
		const v = dir.y.clamp( - 1.0, 1.0 ).asin().mul( 1 / Math.PI ).add( 0.5 );

		return vec2( u, v );

	}

}

const equirectUV = nodeProxy( EquirectUVNode );

addNodeClass( 'EquirectUVNode', EquirectUVNode );

// @TODO: Consider rename WebGLCubeRenderTarget to just CubeRenderTarget

class CubeRenderTarget extends WebGLCubeRenderTarget {

	constructor( size = 1, options = {} ) {

		super( size, options );

		this.isCubeRenderTarget = true;

	}

	fromEquirectangularTexture( renderer, texture$1 ) {

		const currentMinFilter = texture$1.minFilter;
		const currentGenerateMipmaps = texture$1.generateMipmaps;

		texture$1.generateMipmaps = true;

		this.texture.type = texture$1.type;
		this.texture.colorSpace = texture$1.colorSpace;

		this.texture.generateMipmaps = texture$1.generateMipmaps;
		this.texture.minFilter = texture$1.minFilter;
		this.texture.magFilter = texture$1.magFilter;

		const geometry = new BoxGeometry( 5, 5, 5 );

		const uvNode = equirectUV( positionWorldDirection );

		const material = createNodeMaterialFromType( 'MeshBasicNodeMaterial' );
		material.colorNode = texture( texture$1, uvNode, 0 );
		material.side = BackSide;
		material.blending = NoBlending;

		const mesh = new Mesh( geometry, material );

		const scene = new Scene();
		scene.add( mesh );

		// Avoid blurred poles
		if ( texture$1.minFilter === LinearMipmapLinearFilter ) texture$1.minFilter = LinearFilter;

		const camera = new CubeCamera( 1, 10, this );
		camera.update( renderer, scene );

		texture$1.minFilter = currentMinFilter;
		texture$1.currentGenerateMipmaps = currentGenerateMipmaps;

		mesh.geometry.dispose();
		mesh.material.dispose();

		return this;

	}

}

// These defines must match with PMREMGenerator

const cubeUV_r0 = float( 1.0 );
const cubeUV_m0 = float( - 2.0 );
const cubeUV_r1 = float( 0.8 );
const cubeUV_m1 = float( - 1.0 );
const cubeUV_r4 = float( 0.4 );
const cubeUV_m4 = float( 2.0 );
const cubeUV_r5 = float( 0.305 );
const cubeUV_m5 = float( 3.0 );
const cubeUV_r6 = float( 0.21 );
const cubeUV_m6 = float( 4.0 );

const cubeUV_minMipLevel = float( 4.0 );
const cubeUV_minTileSize = float( 16.0 );

// These shader functions convert between the UV coordinates of a single face of
// a cubemap, the 0-5 integer index of a cube face, and the direction vector for
// sampling a textureCube (not generally normalized ).

const getFace = tslFn( ( [ direction ] ) => {

	const absDirection = vec3( abs( direction ) ).toVar();
	const face = float( - 1.0 ).toVar();

	If( absDirection.x.greaterThan( absDirection.z ), () => {

		If( absDirection.x.greaterThan( absDirection.y ), () => {

			face.assign( cond( direction.x.greaterThan( 0.0 ), 0.0, 3.0 ) );

		} ).else( () => {

			face.assign( cond( direction.y.greaterThan( 0.0 ), 1.0, 4.0 ) );

		} );

	} ).else( () => {

		If( absDirection.z.greaterThan( absDirection.y ), () => {

			face.assign( cond( direction.z.greaterThan( 0.0 ), 2.0, 5.0 ) );

		} ).else( () => {

			face.assign( cond( direction.y.greaterThan( 0.0 ), 1.0, 4.0 ) );

		} );

	} );

	return face;

} ).setLayout( {
	name: 'getFace',
	type: 'float',
	inputs: [
		{ name: 'direction', type: 'vec3' }
	]
} );

// RH coordinate system; PMREM face-indexing convention
const getUV = tslFn( ( [ direction, face ] ) => {

	const uv = vec2().toVar();

	If( face.equal( 0.0 ), () => {

		uv.assign( vec2( direction.z, direction.y ).div( abs( direction.x ) ) ); // pos x

	} ).elseif( face.equal( 1.0 ), () => {

		uv.assign( vec2( direction.x.negate(), direction.z.negate() ).div( abs( direction.y ) ) ); // pos y

	} ).elseif( face.equal( 2.0 ), () => {

		uv.assign( vec2( direction.x.negate(), direction.y ).div( abs( direction.z ) ) ); // pos z

	} ).elseif( face.equal( 3.0 ), () => {

		uv.assign( vec2( direction.z.negate(), direction.y ).div( abs( direction.x ) ) ); // neg x

	} ).elseif( face.equal( 4.0 ), () => {

		uv.assign( vec2( direction.x.negate(), direction.z ).div( abs( direction.y ) ) ); // neg y

	} ).else( () => {

		uv.assign( vec2( direction.x, direction.y ).div( abs( direction.z ) ) ); // neg z

	} );

	return mul( 0.5, uv.add( 1.0 ) );

} ).setLayout( {
	name: 'getUV',
	type: 'vec2',
	inputs: [
		{ name: 'direction', type: 'vec3' },
		{ name: 'face', type: 'float' }
	]
} );

const roughnessToMip = tslFn( ( [ roughness ] ) => {

	const mip = float( 0.0 ).toVar();

	If( roughness.greaterThanEqual( cubeUV_r1 ), () => {

		mip.assign( cubeUV_r0.sub( roughness ).mul( cubeUV_m1.sub( cubeUV_m0 ) ).div( cubeUV_r0.sub( cubeUV_r1 ) ).add( cubeUV_m0 ) );

	} ).elseif( roughness.greaterThanEqual( cubeUV_r4 ), () => {

		mip.assign( cubeUV_r1.sub( roughness ).mul( cubeUV_m4.sub( cubeUV_m1 ) ).div( cubeUV_r1.sub( cubeUV_r4 ) ).add( cubeUV_m1 ) );

	} ).elseif( roughness.greaterThanEqual( cubeUV_r5 ), () => {

		mip.assign( cubeUV_r4.sub( roughness ).mul( cubeUV_m5.sub( cubeUV_m4 ) ).div( cubeUV_r4.sub( cubeUV_r5 ) ).add( cubeUV_m4 ) );

	} ).elseif( roughness.greaterThanEqual( cubeUV_r6 ), () => {

		mip.assign( cubeUV_r5.sub( roughness ).mul( cubeUV_m6.sub( cubeUV_m5 ) ).div( cubeUV_r5.sub( cubeUV_r6 ) ).add( cubeUV_m5 ) );

	} ).else( () => {

		mip.assign( float( - 2.0 ).mul( log2( mul( 1.16, roughness ) ) ) ); // 1.16 = 1.79^0.25

	} );

	return mip;

} ).setLayout( {
	name: 'roughnessToMip',
	type: 'float',
	inputs: [
		{ name: 'roughness', type: 'float' }
	]
} );

// RH coordinate system; PMREM face-indexing convention
const getDirection = tslFn( ( [ uv_immutable, face ] ) => {

	const uv = uv_immutable.toVar();
	uv.assign( mul( 2.0, uv ).sub( 1.0 ) );
	const direction = vec3( uv, 1.0 ).toVar();

	If( face.equal( 0.0 ), () => {

		direction.assign( direction.zyx ); // ( 1, v, u ) pos x

	} ).elseif( face.equal( 1.0 ), () => {

		direction.assign( direction.xzy );
		direction.xz.mulAssign( - 1.0 ); // ( -u, 1, -v ) pos y

	} ).elseif( face.equal( 2.0 ), () => {

		direction.x.mulAssign( - 1.0 ); // ( -u, v, 1 ) pos z

	} ).elseif( face.equal( 3.0 ), () => {

		direction.assign( direction.zyx );
		direction.xz.mulAssign( - 1.0 ); // ( -1, v, -u ) neg x

	} ).elseif( face.equal( 4.0 ), () => {

		direction.assign( direction.xzy );
		direction.xy.mulAssign( - 1.0 ); // ( -u, -1, v ) neg y

	} ).elseif( face.equal( 5.0 ), () => {

		direction.z.mulAssign( - 1.0 ); // ( u, v, -1 ) neg zS

	} );

	return direction;

} ).setLayout( {
	name: 'getDirection',
	type: 'vec3',
	inputs: [
		{ name: 'uv', type: 'vec2' },
		{ name: 'face', type: 'float' }
	]
} );

//

const textureCubeUV = tslFn( ( [ envMap, sampleDir_immutable, roughness_immutable, CUBEUV_TEXEL_WIDTH, CUBEUV_TEXEL_HEIGHT, CUBEUV_MAX_MIP ] ) => {

	const roughness = float( roughness_immutable );
	const sampleDir = vec3( sampleDir_immutable );

	const mip = clamp( roughnessToMip( roughness ), cubeUV_m0, CUBEUV_MAX_MIP );
	const mipF = fract( mip );
	const mipInt = floor( mip );
	const color0 = vec3( bilinearCubeUV( envMap, sampleDir, mipInt, CUBEUV_TEXEL_WIDTH, CUBEUV_TEXEL_HEIGHT, CUBEUV_MAX_MIP ) ).toVar();

	If( mipF.notEqual( 0.0 ), () => {

		const color1 = vec3( bilinearCubeUV( envMap, sampleDir, mipInt.add( 1.0 ), CUBEUV_TEXEL_WIDTH, CUBEUV_TEXEL_HEIGHT, CUBEUV_MAX_MIP ) ).toVar();

		color0.assign( mix( color0, color1, mipF ) );

	} );

	return color0;

} );

const bilinearCubeUV = tslFn( ( [ envMap, direction_immutable, mipInt_immutable, CUBEUV_TEXEL_WIDTH, CUBEUV_TEXEL_HEIGHT, CUBEUV_MAX_MIP ] ) => {

	const mipInt = float( mipInt_immutable ).toVar();
	const direction = vec3( direction_immutable );
	const face = float( getFace( direction ) ).toVar();
	const filterInt = float( max$1( cubeUV_minMipLevel.sub( mipInt ), 0.0 ) ).toVar();
	mipInt.assign( max$1( mipInt, cubeUV_minMipLevel ) );
	const faceSize = float( exp2( mipInt ) ).toVar();
	const uv = vec2( getUV( direction, face ).mul( faceSize.sub( 2.0 ) ).add( 1.0 ) ).toVar();

	If( face.greaterThan( 2.0 ), () => {

		uv.y.addAssign( faceSize );
		face.subAssign( 3.0 );

	} );

	uv.x.addAssign( face.mul( faceSize ) );
	uv.x.addAssign( filterInt.mul( mul( 3.0, cubeUV_minTileSize ) ) );
	uv.y.addAssign( mul( 4.0, exp2( CUBEUV_MAX_MIP ).sub( faceSize ) ) );
	uv.x.mulAssign( CUBEUV_TEXEL_WIDTH );
	uv.y.mulAssign( CUBEUV_TEXEL_HEIGHT );

	return envMap.uv( uv ).grad( vec2(), vec2() ); // disable anisotropic filtering

} );

const getSample = tslFn( ( { envMap, mipInt, outputDirection, theta, axis, CUBEUV_TEXEL_WIDTH, CUBEUV_TEXEL_HEIGHT, CUBEUV_MAX_MIP } ) => {

	const cosTheta = cos( theta );

	// Rodrigues' axis-angle rotation
	const sampleDirection = outputDirection.mul( cosTheta )
		.add( axis.cross( outputDirection ).mul( sin( theta ) ) )
		.add( axis.mul( axis.dot( outputDirection ).mul( cosTheta.oneMinus() ) ) );

	return bilinearCubeUV( envMap, sampleDirection, mipInt, CUBEUV_TEXEL_WIDTH, CUBEUV_TEXEL_HEIGHT, CUBEUV_MAX_MIP );

} );

const blur = tslFn( ( { n, latitudinal, poleAxis, outputDirection, weights, samples, dTheta, mipInt, envMap, CUBEUV_TEXEL_WIDTH, CUBEUV_TEXEL_HEIGHT, CUBEUV_MAX_MIP } ) => {

	const axis = vec3( cond( latitudinal, poleAxis, cross( poleAxis, outputDirection ) ) ).toVar();

	If( all( axis.equals( vec3( 0.0 ) ) ), () => {

		axis.assign( vec3( outputDirection.z, 0.0, outputDirection.x.negate() ) );

	} );

	axis.assign( normalize( axis ) );

	const gl_FragColor = vec3().toVar();
	gl_FragColor.addAssign( weights.element( int( 0 ) ).mul( getSample( { theta: 0.0, axis, outputDirection, mipInt, envMap, CUBEUV_TEXEL_WIDTH, CUBEUV_TEXEL_HEIGHT, CUBEUV_MAX_MIP } ) ) );

	loop( { start: int( 1 ), end: n }, ( { i } ) => {

		If( i.greaterThanEqual( samples ), () => {

			Break();

		} );

		const theta = float( dTheta.mul( float( i ) ) ).toVar();
		gl_FragColor.addAssign( weights.element( i ).mul( getSample( { theta: theta.mul( - 1.0 ), axis, outputDirection, mipInt, envMap, CUBEUV_TEXEL_WIDTH, CUBEUV_TEXEL_HEIGHT, CUBEUV_MAX_MIP } ) ) );
		gl_FragColor.addAssign( weights.element( i ).mul( getSample( { theta, axis, outputDirection, mipInt, envMap, CUBEUV_TEXEL_WIDTH, CUBEUV_TEXEL_HEIGHT, CUBEUV_MAX_MIP } ) ) );

	} );

	return vec4( gl_FragColor, 1 );

} );

const LOD_MIN = 4;

// The standard deviations (radians) associated with the extra mips. These are
// chosen to approximate a Trowbridge-Reitz distribution function times the
// geometric shadowing function. These sigma values squared must match the
// variance #defines in cube_uv_reflection_fragment.glsl.js.
const EXTRA_LOD_SIGMA = [ 0.125, 0.215, 0.35, 0.446, 0.526, 0.582 ];

// The maximum length of the blur for loop. Smaller sigmas will use fewer
// samples and exit early, but not recompile the shader.
const MAX_SAMPLES = 20;

const _flatCamera = /*@__PURE__*/ new OrthographicCamera( - 1, 1, 1, - 1, 0, 1 );
const _cubeCamera = /*@__PURE__*/ new PerspectiveCamera( 90, 1 );
const _clearColor$1 = /*@__PURE__*/ new Color();
let _oldTarget = null;
let _oldActiveCubeFace = 0;
let _oldActiveMipmapLevel = 0;

// Golden Ratio
const PHI = ( 1 + Math.sqrt( 5 ) ) / 2;
const INV_PHI = 1 / PHI;

// Vertices of a dodecahedron (except the opposites, which represent the
// same axis), used as axis directions evenly spread on a sphere.
const _axisDirections = [
	/*@__PURE__*/ new Vector3( - PHI, INV_PHI, 0 ),
	/*@__PURE__*/ new Vector3( PHI, INV_PHI, 0 ),
	/*@__PURE__*/ new Vector3( - INV_PHI, 0, PHI ),
	/*@__PURE__*/ new Vector3( INV_PHI, 0, PHI ),
	/*@__PURE__*/ new Vector3( 0, PHI, - INV_PHI ),
	/*@__PURE__*/ new Vector3( 0, PHI, INV_PHI ),
	/*@__PURE__*/ new Vector3( - 1, 1, - 1 ),
	/*@__PURE__*/ new Vector3( 1, 1, - 1 ),
	/*@__PURE__*/ new Vector3( - 1, 1, 1 ),
	/*@__PURE__*/ new Vector3( 1, 1, 1 )
];

//

// WebGPU Face indices
const _faceLib = [
	3, 1, 5,
	0, 4, 2
];

const direction = getDirection( uv(), attribute( 'faceIndex' ) ).normalize();
const outputDirection = vec3( direction.x, direction.y.negate(), direction.z );

/**
 * This class generates a Prefiltered, Mipmapped Radiance Environment Map
 * (PMREM) from a cubeMap environment texture. This allows different levels of
 * blur to be quickly accessed based on material roughness. It is packed into a
 * special CubeUV format that allows us to perform custom interpolation so that
 * we can support nonlinear formats such as RGBE. Unlike a traditional mipmap
 * chain, it only goes down to the LOD_MIN level (above), and then creates extra
 * even more filtered 'mips' at the same LOD_MIN resolution, associated with
 * higher roughness levels. In this way we maintain resolution to smoothly
 * interpolate diffuse lighting while limiting sampling computation.
 *
 * Paper: Fast, Accurate Image-Based Lighting
 * https://drive.google.com/file/d/15y8r_UpKlU9SvV4ILb0C3qCPecS8pvLz/view
*/

class PMREMGenerator {

	constructor( renderer ) {

		this._renderer = renderer;
		this._pingPongRenderTarget = null;

		this._lodMax = 0;
		this._cubeSize = 0;
		this._lodPlanes = [];
		this._sizeLods = [];
		this._sigmas = [];
		this._lodMeshes = [];

		this._blurMaterial = null;
		this._cubemapMaterial = null;
		this._equirectMaterial = null;
		this._backgroundBox = null;

	}

	/**
	 * Generates a PMREM from a supplied Scene, which can be faster than using an
	 * image if networking bandwidth is low. Optional sigma specifies a blur radius
	 * in radians to be applied to the scene before PMREM generation. Optional near
	 * and far planes ensure the scene is rendered in its entirety (the cubeCamera
	 * is placed at the origin).
	 */
	fromScene( scene, sigma = 0, near = 0.1, far = 100 ) {

		_oldTarget = this._renderer.getRenderTarget();
		_oldActiveCubeFace = this._renderer.getActiveCubeFace();
		_oldActiveMipmapLevel = this._renderer.getActiveMipmapLevel();

		this._setSize( 256 );

		const cubeUVRenderTarget = this._allocateTargets();
		cubeUVRenderTarget.depthBuffer = true;

		this._sceneToCubeUV( scene, near, far, cubeUVRenderTarget );

		if ( sigma > 0 ) {

			this._blur( cubeUVRenderTarget, 0, 0, sigma );

		}

		this._applyPMREM( cubeUVRenderTarget );

		this._cleanup( cubeUVRenderTarget );

		return cubeUVRenderTarget;

	}

	/**
	 * Generates a PMREM from an equirectangular texture, which can be either LDR
	 * or HDR. The ideal input image size is 1k (1024 x 512),
	 * as this matches best with the 256 x 256 cubemap output.
	 */
	fromEquirectangular( equirectangular, renderTarget = null ) {

		return this._fromTexture( equirectangular, renderTarget );

	}

	/**
	 * Generates a PMREM from an cubemap texture, which can be either LDR
	 * or HDR. The ideal input cube size is 256 x 256,
	 * as this matches best with the 256 x 256 cubemap output.
	 */
	fromCubemap( cubemap, renderTarget = null ) {

		return this._fromTexture( cubemap, renderTarget );

	}

	/**
	 * Pre-compiles the cubemap shader. You can get faster start-up by invoking this method during
	 * your texture's network fetch for increased concurrency.
	 */
	compileCubemapShader() {

		if ( this._cubemapMaterial === null ) {

			this._cubemapMaterial = _getCubemapMaterial();
			this._compileMaterial( this._cubemapMaterial );

		}

	}

	/**
	 * Pre-compiles the equirectangular shader. You can get faster start-up by invoking this method during
	 * your texture's network fetch for increased concurrency.
	 */
	compileEquirectangularShader() {

		if ( this._equirectMaterial === null ) {

			this._equirectMaterial = _getEquirectMaterial();
			this._compileMaterial( this._equirectMaterial );

		}

	}

	/**
	 * Disposes of the PMREMGenerator's internal memory. Note that PMREMGenerator is a static class,
	 * so you should not need more than one PMREMGenerator object. If you do, calling dispose() on
	 * one of them will cause any others to also become unusable.
	 */
	dispose() {

		this._dispose();

		if ( this._cubemapMaterial !== null ) this._cubemapMaterial.dispose();
		if ( this._equirectMaterial !== null ) this._equirectMaterial.dispose();
		if ( this._backgroundBox !== null ) {

			this._backgroundBox.geometry.dispose();
			this._backgroundBox.material.dispose();

		}

	}

	// private interface

	_setSize( cubeSize ) {

		this._lodMax = Math.floor( Math.log2( cubeSize ) );
		this._cubeSize = Math.pow( 2, this._lodMax );

	}

	_dispose() {

		if ( this._blurMaterial !== null ) this._blurMaterial.dispose();

		if ( this._pingPongRenderTarget !== null ) this._pingPongRenderTarget.dispose();

		for ( let i = 0; i < this._lodPlanes.length; i ++ ) {

			this._lodPlanes[ i ].dispose();

		}

	}

	_cleanup( outputTarget ) {

		this._renderer.setRenderTarget( _oldTarget, _oldActiveCubeFace, _oldActiveMipmapLevel );
		outputTarget.scissorTest = false;
		_setViewport( outputTarget, 0, 0, outputTarget.width, outputTarget.height );

	}

	_fromTexture( texture, renderTarget ) {

		if ( texture.mapping === CubeReflectionMapping || texture.mapping === CubeRefractionMapping ) {

			this._setSize( texture.image.length === 0 ? 16 : ( texture.image[ 0 ].width || texture.image[ 0 ].image.width ) );

		} else { // Equirectangular

			this._setSize( texture.image.width / 4 );

		}

		_oldTarget = this._renderer.getRenderTarget();
		_oldActiveCubeFace = this._renderer.getActiveCubeFace();
		_oldActiveMipmapLevel = this._renderer.getActiveMipmapLevel();

		const cubeUVRenderTarget = renderTarget || this._allocateTargets();
		this._textureToCubeUV( texture, cubeUVRenderTarget );
		this._applyPMREM( cubeUVRenderTarget );
		this._cleanup( cubeUVRenderTarget );

		return cubeUVRenderTarget;

	}

	_allocateTargets() {

		const width = 3 * Math.max( this._cubeSize, 16 * 7 );
		const height = 4 * this._cubeSize;

		const params = {
			magFilter: LinearFilter,
			minFilter: LinearFilter,
			generateMipmaps: false,
			type: HalfFloatType,
			format: RGBAFormat,
			colorSpace: LinearSRGBColorSpace,
			//depthBuffer: false
		};

		const cubeUVRenderTarget = _createRenderTarget( width, height, params );

		if ( this._pingPongRenderTarget === null || this._pingPongRenderTarget.width !== width || this._pingPongRenderTarget.height !== height ) {

			if ( this._pingPongRenderTarget !== null ) {

				this._dispose();

			}

			this._pingPongRenderTarget = _createRenderTarget( width, height, params );

			const { _lodMax } = this;
			( { sizeLods: this._sizeLods, lodPlanes: this._lodPlanes, sigmas: this._sigmas, lodMeshes: this._lodMeshes } = _createPlanes( _lodMax ) );

			this._blurMaterial = _getBlurShader( _lodMax, width, height );

		}

		return cubeUVRenderTarget;

	}

	_compileMaterial( material ) {

		const tmpMesh = this._lodMeshes[ 0 ];
		tmpMesh.material = material;

		this._renderer.compile( tmpMesh, _flatCamera );

	}

	_sceneToCubeUV( scene, near, far, cubeUVRenderTarget ) {

		const cubeCamera = _cubeCamera;
		cubeCamera.near = near;
		cubeCamera.far = far;

		// px, py, pz, nx, ny, nz
		const upSign = [ - 1, 1, - 1, - 1, - 1, - 1 ];
		const forwardSign = [ 1, 1, 1, - 1, - 1, - 1 ];

		const renderer = this._renderer;

		const originalAutoClear = renderer.autoClear;

		renderer.getClearColor( _clearColor$1 );

		renderer.autoClear = false;

		let backgroundBox = this._backgroundBox;

		if ( backgroundBox === null ) {

			const backgroundMaterial = new MeshBasicMaterial( {
				name: 'PMREM.Background',
				side: BackSide,
				depthWrite: false,
				depthTest: false
			} );

			backgroundBox = new Mesh( new BoxGeometry(), backgroundMaterial );

		}

		let useSolidColor = false;
		const background = scene.background;

		if ( background ) {

			if ( background.isColor ) {

				backgroundBox.material.color.copy( background );
				scene.background = null;
				useSolidColor = true;

			}

		} else {

			backgroundBox.material.color.copy( _clearColor$1 );
			useSolidColor = true;

		}

		renderer.setRenderTarget( cubeUVRenderTarget );

		renderer.clear();

		if ( useSolidColor ) {

			renderer.render( backgroundBox, cubeCamera );

		}

		for ( let i = 0; i < 6; i ++ ) {

			const col = i % 3;

			if ( col === 0 ) {

				cubeCamera.up.set( 0, upSign[ i ], 0 );
				cubeCamera.lookAt( forwardSign[ i ], 0, 0 );

			} else if ( col === 1 ) {

				cubeCamera.up.set( 0, 0, upSign[ i ] );
				cubeCamera.lookAt( 0, forwardSign[ i ], 0 );

			} else {

				cubeCamera.up.set( 0, upSign[ i ], 0 );
				cubeCamera.lookAt( 0, 0, forwardSign[ i ] );

			}

			const size = this._cubeSize;

			_setViewport( cubeUVRenderTarget, col * size, i > 2 ? size : 0, size, size );

			renderer.render( scene, cubeCamera );

		}

		renderer.autoClear = originalAutoClear;
		scene.background = background;

	}

	_textureToCubeUV( texture, cubeUVRenderTarget ) {

		const renderer = this._renderer;

		const isCubeTexture = ( texture.mapping === CubeReflectionMapping || texture.mapping === CubeRefractionMapping );

		if ( isCubeTexture ) {

			if ( this._cubemapMaterial === null ) {

				this._cubemapMaterial = _getCubemapMaterial( texture );

			}

		} else {

			if ( this._equirectMaterial === null ) {

				this._equirectMaterial = _getEquirectMaterial( texture );

			}

		}

		const material = isCubeTexture ? this._cubemapMaterial : this._equirectMaterial;
		material.fragmentNode.value = texture;

		const mesh = this._lodMeshes[ 0 ];
		mesh.material = material;

		const size = this._cubeSize;

		_setViewport( cubeUVRenderTarget, 0, 0, 3 * size, 2 * size );

		renderer.setRenderTarget( cubeUVRenderTarget );
		renderer.render( mesh, _flatCamera );

	}

	_applyPMREM( cubeUVRenderTarget ) {

		const renderer = this._renderer;
		const autoClear = renderer.autoClear;
		renderer.autoClear = false;
		const n = this._lodPlanes.length;

		for ( let i = 1; i < n; i ++ ) {

			const sigma = Math.sqrt( this._sigmas[ i ] * this._sigmas[ i ] - this._sigmas[ i - 1 ] * this._sigmas[ i - 1 ] );

			const poleAxis = _axisDirections[ ( n - i - 1 ) % _axisDirections.length ];

			this._blur( cubeUVRenderTarget, i - 1, i, sigma, poleAxis );

		}

		renderer.autoClear = autoClear;

	}

	/**
	 * This is a two-pass Gaussian blur for a cubemap. Normally this is done
	 * vertically and horizontally, but this breaks down on a cube. Here we apply
	 * the blur latitudinally (around the poles), and then longitudinally (towards
	 * the poles) to approximate the orthogonally-separable blur. It is least
	 * accurate at the poles, but still does a decent job.
	 */
	_blur( cubeUVRenderTarget, lodIn, lodOut, sigma, poleAxis ) {

		const pingPongRenderTarget = this._pingPongRenderTarget;

		this._halfBlur(
			cubeUVRenderTarget,
			pingPongRenderTarget,
			lodIn,
			lodOut,
			sigma,
			'latitudinal',
			poleAxis );

		this._halfBlur(
			pingPongRenderTarget,
			cubeUVRenderTarget,
			lodOut,
			lodOut,
			sigma,
			'longitudinal',
			poleAxis );

	}

	_halfBlur( targetIn, targetOut, lodIn, lodOut, sigmaRadians, direction, poleAxis ) {

		const renderer = this._renderer;
		const blurMaterial = this._blurMaterial;

		if ( direction !== 'latitudinal' && direction !== 'longitudinal' ) {

			console.error( 'blur direction must be either latitudinal or longitudinal!' );

		}

		// Number of standard deviations at which to cut off the discrete approximation.
		const STANDARD_DEVIATIONS = 3;

		const blurMesh = this._lodMeshes[ lodOut ];
		blurMesh.material = blurMaterial;

		const blurUniforms = blurMaterial.uniforms;

		const pixels = this._sizeLods[ lodIn ] - 1;
		const radiansPerPixel = isFinite( sigmaRadians ) ? Math.PI / ( 2 * pixels ) : 2 * Math.PI / ( 2 * MAX_SAMPLES - 1 );
		const sigmaPixels = sigmaRadians / radiansPerPixel;
		const samples = isFinite( sigmaRadians ) ? 1 + Math.floor( STANDARD_DEVIATIONS * sigmaPixels ) : MAX_SAMPLES;

		if ( samples > MAX_SAMPLES ) {

			console.warn( `sigmaRadians, ${
				sigmaRadians}, is too large and will clip, as it requested ${
				samples} samples when the maximum is set to ${MAX_SAMPLES}` );

		}

		const weights = [];
		let sum = 0;

		for ( let i = 0; i < MAX_SAMPLES; ++ i ) {

			const x = i / sigmaPixels;
			const weight = Math.exp( - x * x / 2 );
			weights.push( weight );

			if ( i === 0 ) {

				sum += weight;

			} else if ( i < samples ) {

				sum += 2 * weight;

			}

		}

		for ( let i = 0; i < weights.length; i ++ ) {

			weights[ i ] = weights[ i ] / sum;

		}

		targetIn.texture.frame = ( targetIn.texture.frame || 0 ) + 1;

		blurUniforms.envMap.value = targetIn.texture;
		blurUniforms.samples.value = samples;
		blurUniforms.weights.array = weights;
		blurUniforms.latitudinal.value = direction === 'latitudinal' ? 1 : 0;

		if ( poleAxis ) {

			blurUniforms.poleAxis.value = poleAxis;

		}

		const { _lodMax } = this;
		blurUniforms.dTheta.value = radiansPerPixel;
		blurUniforms.mipInt.value = _lodMax - lodIn;

		const outputSize = this._sizeLods[ lodOut ];
		const x = 3 * outputSize * ( lodOut > _lodMax - LOD_MIN ? lodOut - _lodMax + LOD_MIN : 0 );
		const y = 4 * ( this._cubeSize - outputSize );

		_setViewport( targetOut, x, y, 3 * outputSize, 2 * outputSize );
		renderer.setRenderTarget( targetOut );
		renderer.render( blurMesh, _flatCamera );

	}

}

function _createPlanes( lodMax ) {

	const lodPlanes = [];
	const sizeLods = [];
	const sigmas = [];
	const lodMeshes = [];

	let lod = lodMax;

	const totalLods = lodMax - LOD_MIN + 1 + EXTRA_LOD_SIGMA.length;

	for ( let i = 0; i < totalLods; i ++ ) {

		const sizeLod = Math.pow( 2, lod );
		sizeLods.push( sizeLod );
		let sigma = 1.0 / sizeLod;

		if ( i > lodMax - LOD_MIN ) {

			sigma = EXTRA_LOD_SIGMA[ i - lodMax + LOD_MIN - 1 ];

		} else if ( i === 0 ) {

			sigma = 0;

		}

		sigmas.push( sigma );

		const texelSize = 1.0 / ( sizeLod - 2 );
		const min = - texelSize;
		const max = 1 + texelSize;
		const uv1 = [ min, min, max, min, max, max, min, min, max, max, min, max ];

		const cubeFaces = 6;
		const vertices = 6;
		const positionSize = 3;
		const uvSize = 2;
		const faceIndexSize = 1;

		const position = new Float32Array( positionSize * vertices * cubeFaces );
		const uv = new Float32Array( uvSize * vertices * cubeFaces );
		const faceIndex = new Float32Array( faceIndexSize * vertices * cubeFaces );

		for ( let face = 0; face < cubeFaces; face ++ ) {

			const x = ( face % 3 ) * 2 / 3 - 1;
			const y = face > 2 ? 0 : - 1;
			const coordinates = [
				x, y, 0,
				x + 2 / 3, y, 0,
				x + 2 / 3, y + 1, 0,
				x, y, 0,
				x + 2 / 3, y + 1, 0,
				x, y + 1, 0
			];

			const faceIdx = _faceLib[ face ];
			position.set( coordinates, positionSize * vertices * faceIdx );
			uv.set( uv1, uvSize * vertices * faceIdx );
			const fill = [ faceIdx, faceIdx, faceIdx, faceIdx, faceIdx, faceIdx ];
			faceIndex.set( fill, faceIndexSize * vertices * faceIdx );

		}

		const planes = new BufferGeometry();
		planes.setAttribute( 'position', new BufferAttribute( position, positionSize ) );
		planes.setAttribute( 'uv', new BufferAttribute( uv, uvSize ) );
		planes.setAttribute( 'faceIndex', new BufferAttribute( faceIndex, faceIndexSize ) );
		lodPlanes.push( planes );
		lodMeshes.push( new Mesh( planes, null ) );

		if ( lod > LOD_MIN ) {

			lod --;

		}

	}

	return { lodPlanes, sizeLods, sigmas, lodMeshes };

}

function _createRenderTarget( width, height, params ) {

	const cubeUVRenderTarget = new RenderTarget( width, height, params );
	cubeUVRenderTarget.texture.mapping = CubeUVReflectionMapping;
	cubeUVRenderTarget.texture.name = 'PMREM.cubeUv';
	cubeUVRenderTarget.texture.isPMREMTexture = true;
	cubeUVRenderTarget.scissorTest = true;
	return cubeUVRenderTarget;

}

function _setViewport( target, x, y, width, height ) {

	const viewY = target.height - height - y;

	target.viewport.set( x, viewY, width, height );
	target.scissor.set( x, viewY, width, height );

}

function _getMaterial() {

	const material = new NodeMaterial();
	material.depthTest = false;
	material.depthWrite = false;
	material.blending = NoBlending;

	return material;

}

function _getBlurShader( lodMax, width, height ) {

	const weights = uniforms( new Array( MAX_SAMPLES ).fill( 0 ) );
	const poleAxis = uniform( new Vector3( 0, 1, 0 ) );
	const dTheta = uniform( 0 );
	const n = float( MAX_SAMPLES );
	const latitudinal = uniform( 0 ); // false, bool
	const samples = uniform( 1 ); // int
	const envMap = texture( null );
	const mipInt = uniform( 0 ); // int
	const CUBEUV_TEXEL_WIDTH = float( 1 / width );
	const CUBEUV_TEXEL_HEIGHT = float( 1 / height );
	const CUBEUV_MAX_MIP = float( lodMax );

	const materialUniforms = {
		n,
		latitudinal,
		weights,
		poleAxis,
		outputDirection,
		dTheta,
		samples,
		envMap,
		mipInt,
		CUBEUV_TEXEL_WIDTH,
		CUBEUV_TEXEL_HEIGHT,
		CUBEUV_MAX_MIP
	};

	const material = _getMaterial();
	material.uniforms = materialUniforms; // TODO: Move to outside of the material
	material.fragmentNode = blur( { ...materialUniforms, latitudinal: latitudinal.equal( 1 ) } );

	return material;

}

function _getCubemapMaterial( envTexture ) {

	const material = _getMaterial();
	material.fragmentNode = cubeTexture( envTexture, outputDirection );

	return material;

}

function _getEquirectMaterial( envTexture ) {

	const material = _getMaterial();
	material.fragmentNode = texture( envTexture, equirectUV( outputDirection ), 0 );

	return material;

}

let _id$3 = 0;

class BindGroup {

	constructor( name = '', bindings = [] ) {

		this.name = name;
		this.bindings = bindings;

		this.id = _id$3 ++;

	}

}

const rendererCache = new WeakMap();

const typeFromLength = new Map( [
	[ 2, 'vec2' ],
	[ 3, 'vec3' ],
	[ 4, 'vec4' ],
	[ 9, 'mat3' ],
	[ 16, 'mat4' ]
] );

const typeFromArray = new Map( [
	[ Int8Array, 'int' ],
	[ Int16Array, 'int' ],
	[ Int32Array, 'int' ],
	[ Uint8Array, 'uint' ],
	[ Uint16Array, 'uint' ],
	[ Uint32Array, 'uint' ],
	[ Float32Array, 'float' ]
] );

const toFloat = ( value ) => {

	value = Number( value );

	return value + ( value % 1 ? '' : '.0' );

};

class NodeBuilder {

	constructor( object, renderer, parser ) {

		this.object = object;
		this.material = ( object && object.material ) || null;
		this.geometry = ( object && object.geometry ) || null;
		this.renderer = renderer;
		this.parser = parser;
		this.scene = null;
		this.camera = null;

		this.nodes = [];
		this.updateNodes = [];
		this.updateBeforeNodes = [];
		this.updateAfterNodes = [];
		this.hashNodes = {};

		this.lightsNode = null;
		this.environmentNode = null;
		this.fogNode = null;

		this.clippingContext = null;

		this.vertexShader = null;
		this.fragmentShader = null;
		this.computeShader = null;

		this.flowNodes = { vertex: [], fragment: [], compute: [] };
		this.flowCode = { vertex: '', fragment: '', compute: '' };
		this.uniforms = { vertex: [], fragment: [], compute: [], index: 0 };
		this.structs = { vertex: [], fragment: [], compute: [], index: 0 };
		this.bindings = { vertex: {}, fragment: {}, compute: {} };
		this.bindingsIndexes = {};
		this.bindGroups = null;
		this.attributes = [];
		this.bufferAttributes = [];
		this.varyings = [];
		this.codes = {};
		this.vars = {};
		this.flow = { code: '' };
		this.chaining = [];
		this.stack = stack();
		this.stacks = [];
		this.tab = '\t';

		this.instanceBindGroups = true;

		this.currentFunctionNode = null;

		this.context = {
			keywords: new NodeKeywords(),
			material: this.material
		};

		this.cache = new NodeCache();
		this.globalCache = this.cache;

		this.flowsData = new WeakMap();

		this.shaderStage = null;
		this.buildStage = null;

	}

	getBingGroupsCache() {

		let bindGroupsCache = rendererCache.get( this.renderer );

		if ( bindGroupsCache === undefined ) {

			bindGroupsCache = new ChainMap();

			rendererCache.set( this.renderer, bindGroupsCache );

		}

		return bindGroupsCache;

	}

	createRenderTarget( width, height, options ) {

		return new RenderTarget( width, height, options );

	}

	createCubeRenderTarget( size, options ) {

		return new CubeRenderTarget( size, options );

	}

	createPMREMGenerator() {

		// TODO: Move Materials.js to outside of the Nodes.js in order to remove this function and improve tree-shaking support

		return new PMREMGenerator( this.renderer );

	}

	includes( node ) {

		return this.nodes.includes( node );

	}

	_getBindGroup( groupName, bindings ) {

		const bindGroupsCache = this.getBingGroupsCache();

		//

		const bindingsArray = [];

		let sharedGroup = true;

		for ( const binding of bindings ) {

			bindingsArray.push( binding );

			sharedGroup = sharedGroup && binding.groupNode.shared !== true;

		}

		//

		let bindGroup;

		if ( sharedGroup ) {

			bindGroup = bindGroupsCache.get( bindingsArray );

			if ( bindGroup === undefined ) {

				bindGroup = new BindGroup( groupName, bindingsArray );
				bindGroupsCache.set( bindingsArray, bindGroup );

			}

		} else {

			bindGroup = new BindGroup( groupName, bindingsArray );

		}

		return bindGroup;

	}

	getBindGroupArray( groupName, shaderStage ) {

		const bindings = this.bindings[ shaderStage ];

		let bindGroup = bindings[ groupName ];

		if ( bindGroup === undefined ) {

			if ( this.bindingsIndexes[ groupName ] === undefined ) {

				this.bindingsIndexes[ groupName ] = { binding: 0, group: Object.keys( this.bindingsIndexes ).length };

			}

			bindings[ groupName ] = bindGroup = [];

		}

		return bindGroup;

	}

	getBindings() {

		let bindingsGroups = this.bindGroups;

		if ( bindingsGroups === null ) {

			const groups = {};
			const bindings = this.bindings;

			for ( const shaderStage of shaderStages ) {

				for ( const groupName in bindings[ shaderStage ] ) {

					const uniforms = bindings[ shaderStage ][ groupName ];

					const groupUniforms = groups[ groupName ] || ( groups[ groupName ] = [] );
					groupUniforms.push( ...uniforms );

				}

			}

			bindingsGroups = [];

			for ( const groupName in groups ) {

				const group = groups[ groupName ];

				const bindingsGroup = this._getBindGroup( groupName, group );

				bindingsGroups.push( bindingsGroup );

			}

			this.bindGroups = bindingsGroups;

		}

		return bindingsGroups;

	}

	setHashNode( node, hash ) {

		this.hashNodes[ hash ] = node;

	}

	addNode( node ) {

		if ( this.nodes.includes( node ) === false ) {

			this.nodes.push( node );

			this.setHashNode( node, node.getHash( this ) );

		}

	}

	buildUpdateNodes() {

		for ( const node of this.nodes ) {

			const updateType = node.getUpdateType();
			const updateBeforeType = node.getUpdateBeforeType();
			const updateAfterType = node.getUpdateAfterType();

			if ( updateType !== NodeUpdateType.NONE ) {

				this.updateNodes.push( node.getSelf() );

			}

			if ( updateBeforeType !== NodeUpdateType.NONE ) {

				this.updateBeforeNodes.push( node );

			}

			if ( updateAfterType !== NodeUpdateType.NONE ) {

				this.updateAfterNodes.push( node );

			}

		}

	}

	get currentNode() {

		return this.chaining[ this.chaining.length - 1 ];

	}

	isFilteredTexture( texture ) {

		return ( texture.magFilter === LinearFilter || texture.magFilter === LinearMipmapNearestFilter || texture.magFilter === NearestMipmapLinearFilter || texture.magFilter === LinearMipmapLinearFilter ||
			texture.minFilter === LinearFilter || texture.minFilter === LinearMipmapNearestFilter || texture.minFilter === NearestMipmapLinearFilter || texture.minFilter === LinearMipmapLinearFilter );

	}

	addChain( node ) {

		/*
		if ( this.chaining.indexOf( node ) !== - 1 ) {

			console.warn( 'Recursive node: ', node );

		}
		*/

		this.chaining.push( node );

	}

	removeChain( node ) {

		const lastChain = this.chaining.pop();

		if ( lastChain !== node ) {

			throw new Error( 'NodeBuilder: Invalid node chaining!' );

		}

	}

	getMethod( method ) {

		return method;

	}

	getNodeFromHash( hash ) {

		return this.hashNodes[ hash ];

	}

	addFlow( shaderStage, node ) {

		this.flowNodes[ shaderStage ].push( node );

		return node;

	}

	setContext( context ) {

		this.context = context;

	}

	getContext() {

		return this.context;

	}

	getSharedContext() {

		({ ...this.context });

		return this.context;

	}

	setCache( cache ) {

		this.cache = cache;

	}

	getCache() {

		return this.cache;

	}

	getCacheFromNode( node, parent = true ) {

		const data = this.getDataFromNode( node );
		if ( data.cache === undefined ) data.cache = new NodeCache( parent ? this.getCache() : null );

		return data.cache;

	}

	isAvailable( /*name*/ ) {

		return false;

	}

	getVertexIndex() {

		console.warn( 'Abstract function.' );

	}

	getInstanceIndex() {

		console.warn( 'Abstract function.' );

	}

	getDrawIndex() {

		console.warn( 'Abstract function.' );

	}

	getFrontFacing() {

		console.warn( 'Abstract function.' );

	}

	getFragCoord() {

		console.warn( 'Abstract function.' );

	}

	isFlipY() {

		return false;

	}

	generateTexture( /* texture, textureProperty, uvSnippet */ ) {

		console.warn( 'Abstract function.' );

	}

	generateTextureLod( /* texture, textureProperty, uvSnippet, levelSnippet */ ) {

		console.warn( 'Abstract function.' );

	}

	generateConst( type, value = null ) {

		if ( value === null ) {

			if ( type === 'float' || type === 'int' || type === 'uint' ) value = 0;
			else if ( type === 'bool' ) value = false;
			else if ( type === 'color' ) value = new Color();
			else if ( type === 'vec2' ) value = new Vector2();
			else if ( type === 'vec3' ) value = new Vector3();
			else if ( type === 'vec4' ) value = new Vector4();

		}

		if ( type === 'float' ) return toFloat( value );
		if ( type === 'int' ) return `${ Math.round( value ) }`;
		if ( type === 'uint' ) return value >= 0 ? `${ Math.round( value ) }u` : '0u';
		if ( type === 'bool' ) return value ? 'true' : 'false';
		if ( type === 'color' ) return `${ this.getType( 'vec3' ) }( ${ toFloat( value.r ) }, ${ toFloat( value.g ) }, ${ toFloat( value.b ) } )`;

		const typeLength = this.getTypeLength( type );

		const componentType = this.getComponentType( type );

		const generateConst = value => this.generateConst( componentType, value );

		if ( typeLength === 2 ) {

			return `${ this.getType( type ) }( ${ generateConst( value.x ) }, ${ generateConst( value.y ) } )`;

		} else if ( typeLength === 3 ) {

			return `${ this.getType( type ) }( ${ generateConst( value.x ) }, ${ generateConst( value.y ) }, ${ generateConst( value.z ) } )`;

		} else if ( typeLength === 4 ) {

			return `${ this.getType( type ) }( ${ generateConst( value.x ) }, ${ generateConst( value.y ) }, ${ generateConst( value.z ) }, ${ generateConst( value.w ) } )`;

		} else if ( typeLength > 4 && value && ( value.isMatrix3 || value.isMatrix4 ) ) {

			return `${ this.getType( type ) }( ${ value.elements.map( generateConst ).join( ', ' ) } )`;

		} else if ( typeLength > 4 ) {

			return `${ this.getType( type ) }()`;

		}

		throw new Error( `NodeBuilder: Type '${type}' not found in generate constant attempt.` );

	}

	getType( type ) {

		if ( type === 'color' ) return 'vec3';

		return type;

	}

	hasGeometryAttribute( name ) {

		return this.geometry && this.geometry.getAttribute( name ) !== undefined;

	}

	getAttribute( name, type ) {

		const attributes = this.attributes;

		// find attribute

		for ( const attribute of attributes ) {

			if ( attribute.name === name ) {

				return attribute;

			}

		}

		// create a new if no exist

		const attribute = new NodeAttribute( name, type );

		attributes.push( attribute );

		return attribute;

	}

	getPropertyName( node/*, shaderStage*/ ) {

		return node.name;

	}

	isVector( type ) {

		return /vec\d/.test( type );

	}

	isMatrix( type ) {

		return /mat\d/.test( type );

	}

	isReference( type ) {

		return type === 'void' || type === 'property' || type === 'sampler' || type === 'texture' || type === 'cubeTexture' || type === 'storageTexture' || type === 'depthTexture' || type === 'texture3D';

	}

	needsColorSpaceToLinear( /*texture*/ ) {

		return false;

	}

	getComponentTypeFromTexture( texture ) {

		const type = texture.type;

		if ( texture.isDataTexture ) {

			if ( type === IntType ) return 'int';
			if ( type === UnsignedIntType ) return 'uint';

		}

		return 'float';

	}

	getElementType( type ) {

		if ( type === 'mat2' ) return 'vec2';
		if ( type === 'mat3' ) return 'vec3';
		if ( type === 'mat4' ) return 'vec4';

		return this.getComponentType( type );

	}

	getComponentType( type ) {

		type = this.getVectorType( type );

		if ( type === 'float' || type === 'bool' || type === 'int' || type === 'uint' ) return type;

		const componentType = /(b|i|u|)(vec|mat)([2-4])/.exec( type );

		if ( componentType === null ) return null;

		if ( componentType[ 1 ] === 'b' ) return 'bool';
		if ( componentType[ 1 ] === 'i' ) return 'int';
		if ( componentType[ 1 ] === 'u' ) return 'uint';

		return 'float';

	}

	getVectorType( type ) {

		if ( type === 'color' ) return 'vec3';
		if ( type === 'texture' || type === 'cubeTexture' || type === 'storageTexture' || type === 'texture3D' ) return 'vec4';

		return type;

	}

	getTypeFromLength( length, componentType = 'float' ) {

		if ( length === 1 ) return componentType;

		const baseType = typeFromLength.get( length );
		const prefix = componentType === 'float' ? '' : componentType[ 0 ];

		return prefix + baseType;

	}

	getTypeFromArray( array ) {

		return typeFromArray.get( array.constructor );

	}

	getTypeFromAttribute( attribute ) {

		let dataAttribute = attribute;

		if ( attribute.isInterleavedBufferAttribute ) dataAttribute = attribute.data;

		const array = dataAttribute.array;
		const itemSize = attribute.itemSize;
		const normalized = attribute.normalized;

		let arrayType;

		if ( ! ( attribute instanceof Float16BufferAttribute ) && normalized !== true ) {

			arrayType = this.getTypeFromArray( array );

		}

		return this.getTypeFromLength( itemSize, arrayType );

	}

	getTypeLength( type ) {

		const vecType = this.getVectorType( type );
		const vecNum = /vec([2-4])/.exec( vecType );

		if ( vecNum !== null ) return Number( vecNum[ 1 ] );
		if ( vecType === 'float' || vecType === 'bool' || vecType === 'int' || vecType === 'uint' ) return 1;
		if ( /mat2/.test( type ) === true ) return 4;
		if ( /mat3/.test( type ) === true ) return 9;
		if ( /mat4/.test( type ) === true ) return 16;

		return 0;

	}

	getVectorFromMatrix( type ) {

		return type.replace( 'mat', 'vec' );

	}

	changeComponentType( type, newComponentType ) {

		return this.getTypeFromLength( this.getTypeLength( type ), newComponentType );

	}

	getIntegerType( type ) {

		const componentType = this.getComponentType( type );

		if ( componentType === 'int' || componentType === 'uint' ) return type;

		return this.changeComponentType( type, 'int' );

	}

	addStack() {

		this.stack = stack( this.stack );

		this.stacks.push( getCurrentStack() || this.stack );
		setCurrentStack( this.stack );

		return this.stack;

	}

	removeStack() {

		const lastStack = this.stack;
		this.stack = lastStack.parent;

		setCurrentStack( this.stacks.pop() );

		return lastStack;

	}

	getDataFromNode( node, shaderStage = this.shaderStage, cache = null ) {

		cache = cache === null ? ( node.isGlobal( this ) ? this.globalCache : this.cache ) : cache;

		let nodeData = cache.getData( node );

		if ( nodeData === undefined ) {

			nodeData = {};

			cache.setData( node, nodeData );

		}

		if ( nodeData[ shaderStage ] === undefined ) nodeData[ shaderStage ] = {};

		return nodeData[ shaderStage ];

	}

	getNodeProperties( node, shaderStage = 'any' ) {

		const nodeData = this.getDataFromNode( node, shaderStage );

		return nodeData.properties || ( nodeData.properties = { outputNode: null } );

	}

	getBufferAttributeFromNode( node, type ) {

		const nodeData = this.getDataFromNode( node );

		let bufferAttribute = nodeData.bufferAttribute;

		if ( bufferAttribute === undefined ) {

			const index = this.uniforms.index ++;

			bufferAttribute = new NodeAttribute( 'nodeAttribute' + index, type, node );

			this.bufferAttributes.push( bufferAttribute );

			nodeData.bufferAttribute = bufferAttribute;

		}

		return bufferAttribute;

	}

	getStructTypeFromNode( node, shaderStage = this.shaderStage ) {

		const nodeData = this.getDataFromNode( node, shaderStage );

		if ( nodeData.structType === undefined ) {

			const index = this.structs.index ++;

			node.name = `StructType${ index }`;
			this.structs[ shaderStage ].push( node );

			nodeData.structType = node;

		}

		return node;

	}

	getUniformFromNode( node, type, shaderStage = this.shaderStage, name = null ) {

		const nodeData = this.getDataFromNode( node, shaderStage, this.globalCache );

		let nodeUniform = nodeData.uniform;

		if ( nodeUniform === undefined ) {

			const index = this.uniforms.index ++;

			nodeUniform = new NodeUniform( name || ( 'nodeUniform' + index ), type, node );

			this.uniforms[ shaderStage ].push( nodeUniform );

			nodeData.uniform = nodeUniform;

		}

		return nodeUniform;

	}

	getVarFromNode( node, name = null, type = node.getNodeType( this ), shaderStage = this.shaderStage ) {

		const nodeData = this.getDataFromNode( node, shaderStage );

		let nodeVar = nodeData.variable;

		if ( nodeVar === undefined ) {

			const vars = this.vars[ shaderStage ] || ( this.vars[ shaderStage ] = [] );

			if ( name === null ) name = 'nodeVar' + vars.length;

			nodeVar = new NodeVar( name, type );

			vars.push( nodeVar );

			nodeData.variable = nodeVar;

		}

		return nodeVar;

	}

	getVaryingFromNode( node, name = null, type = node.getNodeType( this ) ) {

		const nodeData = this.getDataFromNode( node, 'any' );

		let nodeVarying = nodeData.varying;

		if ( nodeVarying === undefined ) {

			const varyings = this.varyings;
			const index = varyings.length;

			if ( name === null ) name = 'nodeVarying' + index;

			nodeVarying = new NodeVarying( name, type );

			varyings.push( nodeVarying );

			nodeData.varying = nodeVarying;

		}

		return nodeVarying;

	}

	getCodeFromNode( node, type, shaderStage = this.shaderStage ) {

		const nodeData = this.getDataFromNode( node );

		let nodeCode = nodeData.code;

		if ( nodeCode === undefined ) {

			const codes = this.codes[ shaderStage ] || ( this.codes[ shaderStage ] = [] );
			const index = codes.length;

			nodeCode = new NodeCode( 'nodeCode' + index, type );

			codes.push( nodeCode );

			nodeData.code = nodeCode;

		}

		return nodeCode;

	}

	addLineFlowCode( code ) {

		if ( code === '' ) return this;

		code = this.tab + code;

		if ( ! /;\s*$/.test( code ) ) {

			code = code + ';\n';

		}

		this.flow.code += code;

		return this;

	}

	addFlowCode( code ) {

		this.flow.code += code;

		return this;

	}

	addFlowTab() {

		this.tab += '\t';

		return this;

	}

	removeFlowTab() {

		this.tab = this.tab.slice( 0, - 1 );

		return this;

	}

	getFlowData( node/*, shaderStage*/ ) {

		return this.flowsData.get( node );

	}

	flowNode( node ) {

		const output = node.getNodeType( this );

		const flowData = this.flowChildNode( node, output );

		this.flowsData.set( node, flowData );

		return flowData;

	}

	buildFunctionNode( shaderNode ) {

		const fn = new FunctionNode();

		const previous = this.currentFunctionNode;

		this.currentFunctionNode = fn;

		fn.code = this.buildFunctionCode( shaderNode );

		this.currentFunctionNode = previous;

		return fn;

	}

	flowShaderNode( shaderNode ) {

		const layout = shaderNode.layout;

		let inputs;

		if ( shaderNode.isArrayInput ) {

			inputs = [];

			for ( const input of layout.inputs ) {

				inputs.push( new ParameterNode( input.type, input.name ) );

			}

		} else {

			inputs = {};

			for ( const input of layout.inputs ) {

				inputs[ input.name ] = new ParameterNode( input.type, input.name );

			}

		}

		//

		shaderNode.layout = null;

		const callNode = shaderNode.call( inputs );
		const flowData = this.flowStagesNode( callNode, layout.type );

		shaderNode.layout = layout;

		return flowData;

	}

	flowStagesNode( node, output = null ) {

		const previousFlow = this.flow;
		const previousVars = this.vars;
		const previousCache = this.cache;
		const previousBuildStage = this.buildStage;
		const previousStack = this.stack;

		const flow = {
			code: ''
		};

		this.flow = flow;
		this.vars = {};
		this.cache = new NodeCache();
		this.stack = stack();

		for ( const buildStage of defaultBuildStages ) {

			this.setBuildStage( buildStage );

			flow.result = node.build( this, output );

		}

		flow.vars = this.getVars( this.shaderStage );

		this.flow = previousFlow;
		this.vars = previousVars;
		this.cache = previousCache;
		this.stack = previousStack;

		this.setBuildStage( previousBuildStage );

		return flow;

	}

	getFunctionOperator() {

		return null;

	}

	flowChildNode( node, output = null ) {

		const previousFlow = this.flow;

		const flow = {
			code: ''
		};

		this.flow = flow;

		flow.result = node.build( this, output );

		this.flow = previousFlow;

		return flow;

	}

	flowNodeFromShaderStage( shaderStage, node, output = null, propertyName = null ) {

		const previousShaderStage = this.shaderStage;

		this.setShaderStage( shaderStage );

		const flowData = this.flowChildNode( node, output );

		if ( propertyName !== null ) {

			flowData.code += `${ this.tab + propertyName } = ${ flowData.result };\n`;

		}

		this.flowCode[ shaderStage ] = this.flowCode[ shaderStage ] + flowData.code;

		this.setShaderStage( previousShaderStage );

		return flowData;

	}

	getAttributesArray() {

		return this.attributes.concat( this.bufferAttributes );

	}

	getAttributes( /*shaderStage*/ ) {

		console.warn( 'Abstract function.' );

	}

	getVaryings( /*shaderStage*/ ) {

		console.warn( 'Abstract function.' );

	}

	getVar( type, name ) {

		return `${ this.getType( type ) } ${ name }`;

	}

	getVars( shaderStage ) {

		let snippet = '';

		const vars = this.vars[ shaderStage ];

		if ( vars !== undefined ) {

			for ( const variable of vars ) {

				snippet += `${ this.getVar( variable.type, variable.name ) }; `;

			}

		}

		return snippet;

	}

	getUniforms( /*shaderStage*/ ) {

		console.warn( 'Abstract function.' );

	}

	getCodes( shaderStage ) {

		const codes = this.codes[ shaderStage ];

		let code = '';

		if ( codes !== undefined ) {

			for ( const nodeCode of codes ) {

				code += nodeCode.code + '\n';

			}

		}

		return code;

	}

	getHash() {

		return this.vertexShader + this.fragmentShader + this.computeShader;

	}

	setShaderStage( shaderStage ) {

		this.shaderStage = shaderStage;

	}

	getShaderStage() {

		return this.shaderStage;

	}

	setBuildStage( buildStage ) {

		this.buildStage = buildStage;

	}

	getBuildStage() {

		return this.buildStage;

	}

	buildCode() {

		console.warn( 'Abstract function.' );

	}

	build() {

		const { object, material } = this;


		if ( material !== null ) {

			NodeMaterial.fromMaterial( material ).build( this );

		} else {

			this.addFlow( 'compute', object );

		}

		// setup() -> stage 1: create possible new nodes and returns an output reference node
		// analyze()   -> stage 2: analyze nodes to possible optimization and validation
		// generate()  -> stage 3: generate shader

		for ( const buildStage of defaultBuildStages ) {

			this.setBuildStage( buildStage );

			if ( this.context.vertex && this.context.vertex.isNode ) {

				this.flowNodeFromShaderStage( 'vertex', this.context.vertex );

			}

			for ( const shaderStage of shaderStages ) {

				this.setShaderStage( shaderStage );

				const flowNodes = this.flowNodes[ shaderStage ];

				for ( const node of flowNodes ) {

					if ( buildStage === 'generate' ) {

						this.flowNode( node );

					} else {

						node.build( this );

					}

				}

			}

		}

		this.setBuildStage( null );
		this.setShaderStage( null );

		// stage 4: build code for a specific output

		this.buildCode();
		this.buildUpdateNodes();

		return this;

	}

	getNodeUniform( uniformNode, type ) {

		if ( type === 'float' || type === 'int' || type === 'uint' ) return new NumberNodeUniform( uniformNode );
		if ( type === 'vec2' || type === 'ivec2' || type === 'uvec2' ) return new Vector2NodeUniform( uniformNode );
		if ( type === 'vec3' || type === 'ivec3' || type === 'uvec3' ) return new Vector3NodeUniform( uniformNode );
		if ( type === 'vec4' || type === 'ivec4' || type === 'uvec4' ) return new Vector4NodeUniform( uniformNode );
		if ( type === 'color' ) return new ColorNodeUniform( uniformNode );
		if ( type === 'mat3' ) return new Matrix3NodeUniform( uniformNode );
		if ( type === 'mat4' ) return new Matrix4NodeUniform( uniformNode );

		throw new Error( `Uniform "${type}" not declared.` );

	}

	createNodeMaterial( type = 'NodeMaterial' ) {

		// TODO: Move Materials.js to outside of the Nodes.js in order to remove this function and improve tree-shaking support

		return createNodeMaterialFromType( type );

	}

	format( snippet, fromType, toType ) {

		fromType = this.getVectorType( fromType );
		toType = this.getVectorType( toType );

		if ( fromType === toType || toType === null || this.isReference( toType ) ) {

			return snippet;

		}

		const fromTypeLength = this.getTypeLength( fromType );
		const toTypeLength = this.getTypeLength( toType );

		if ( fromTypeLength > 4 ) { // fromType is matrix-like

			// @TODO: ignore for now

			return snippet;

		}

		if ( toTypeLength > 4 || toTypeLength === 0 ) { // toType is matrix-like or unknown

			// @TODO: ignore for now

			return snippet;

		}

		if ( fromTypeLength === toTypeLength ) {

			return `${ this.getType( toType ) }( ${ snippet } )`;

		}

		if ( fromTypeLength > toTypeLength ) {

			return this.format( `${ snippet }.${ 'xyz'.slice( 0, toTypeLength ) }`, this.getTypeFromLength( toTypeLength, this.getComponentType( fromType ) ), toType );

		}

		if ( toTypeLength === 4 && fromTypeLength > 1 ) { // toType is vec4-like

			return `${ this.getType( toType ) }( ${ this.format( snippet, fromType, 'vec3' ) }, 1.0 )`;

		}

		if ( fromTypeLength === 2 ) { // fromType is vec2-like and toType is vec3-like

			return `${ this.getType( toType ) }( ${ this.format( snippet, fromType, 'vec2' ) }, 0.0 )`;

		}

		if ( fromTypeLength === 1 && toTypeLength > 1 && fromType !== this.getComponentType( toType ) ) { // fromType is float-like

			// convert a number value to vector type, e.g:
			// vec3( 1u ) -> vec3( float( 1u ) )

			snippet = `${ this.getType( this.getComponentType( toType ) ) }( ${ snippet } )`;

		}

		return `${ this.getType( toType ) }( ${ snippet } )`; // fromType is float-like

	}

	getSignature() {

		return `// Three.js r${ REVISION } - Node System\n`;

	}

}

class NodeFrame {

	constructor() {

		this.time = 0;
		this.deltaTime = 0;

		this.frameId = 0;
		this.renderId = 0;

		this.startTime = null;

		this.updateMap = new WeakMap();
		this.updateBeforeMap = new WeakMap();
		this.updateAfterMap = new WeakMap();

		this.renderer = null;
		this.material = null;
		this.camera = null;
		this.object = null;
		this.scene = null;

	}

	_getMaps( referenceMap, nodeRef ) {

		let maps = referenceMap.get( nodeRef );

		if ( maps === undefined ) {

			maps = {
				renderMap: new WeakMap(),
				frameMap: new WeakMap()
			};

			referenceMap.set( nodeRef, maps );

		}

		return maps;

	}

	updateBeforeNode( node ) {

		const updateType = node.getUpdateBeforeType();
		const reference = node.updateReference( this );

		if ( updateType === NodeUpdateType.FRAME ) {

			const { frameMap } = this._getMaps( this.updateBeforeMap, reference );

			if ( frameMap.get( reference ) !== this.frameId ) {

				if ( node.updateBefore( this ) !== false ) {

					frameMap.set( reference, this.frameId );

				}

			}

		} else if ( updateType === NodeUpdateType.RENDER ) {

			const { renderMap } = this._getMaps( this.updateBeforeMap, reference );

			if ( renderMap.get( reference ) !== this.renderId ) {

				if ( node.updateBefore( this ) !== false ) {

					renderMap.set( reference, this.renderId );

				}

			}

		} else if ( updateType === NodeUpdateType.OBJECT ) {

			node.updateBefore( this );

		}

	}

	updateAfterNode( node ) {

		const updateType = node.getUpdateAfterType();
		const reference = node.updateReference( this );

		if ( updateType === NodeUpdateType.FRAME ) {

			const { frameMap } = this._getMaps( this.updateAfterMap, reference );

			if ( frameMap.get( reference ) !== this.frameId ) {

				if ( node.updateAfter( this ) !== false ) {

					frameMap.set( reference, this.frameId );

				}

			}

		} else if ( updateType === NodeUpdateType.RENDER ) {

			const { renderMap } = this._getMaps( this.updateAfterMap, reference );

			if ( renderMap.get( reference ) !== this.renderId ) {

				if ( node.updateAfter( this ) !== false ) {

					renderMap.set( reference, this.renderId );

				}

			}

		} else if ( updateType === NodeUpdateType.OBJECT ) {

			node.updateAfter( this );

		}

	}

	updateNode( node ) {

		const updateType = node.getUpdateType();
		const reference = node.updateReference( this );

		if ( updateType === NodeUpdateType.FRAME ) {

			const { frameMap } = this._getMaps( this.updateMap, reference );

			if ( frameMap.get( reference ) !== this.frameId ) {

				if ( node.update( this ) !== false ) {

					frameMap.set( reference, this.frameId );

				}

			}

		} else if ( updateType === NodeUpdateType.RENDER ) {

			const { renderMap } = this._getMaps( this.updateMap, reference );

			if ( renderMap.get( reference ) !== this.renderId ) {

				if ( node.update( this ) !== false ) {

					renderMap.set( reference, this.renderId );

				}

			}

		} else if ( updateType === NodeUpdateType.OBJECT ) {

			node.update( this );

		}

	}

	update() {

		this.frameId ++;

		if ( this.lastTime === undefined ) this.lastTime = performance.now();

		this.deltaTime = ( performance.now() - this.lastTime ) / 1000;

		this.lastTime = performance.now();

		this.time += this.deltaTime;

	}

}

class NodeFunctionInput {

	constructor( type, name, count = null, qualifier = '', isConst = false ) {

		this.type = type;
		this.name = name;
		this.count = count;
		this.qualifier = qualifier;
		this.isConst = isConst;

	}

}

NodeFunctionInput.isNodeFunctionInput = true;

class StructTypeNode extends Node {

	constructor( types ) {

		super();

		this.types = types;
		this.isStructTypeNode = true;

	}

	getMemberTypes() {

		return this.types;

	}

}

addNodeClass( 'StructTypeNode', StructTypeNode );

class OutputStructNode extends Node {

	constructor( ...members ) {

		super();

		this.members = members;

		this.isOutputStructNode = true;

	}

	setup( builder ) {

		super.setup( builder );

		const members = this.members;
		const types = [];

		for ( let i = 0; i < members.length; i ++ ) {

			types.push( members[ i ].getNodeType( builder ) );

		}

		this.nodeType = builder.getStructTypeFromNode( new StructTypeNode( types ) ).name;

	}

	generate( builder, output ) {

		const propertyName = builder.getOutputStructName();
		const members = this.members;

		const structPrefix = propertyName !== '' ? propertyName + '.' : '';

		for ( let i = 0; i < members.length; i ++ ) {

			const snippet = members[ i ].build( builder, output );

			builder.addLineFlowCode( `${ structPrefix }m${ i } = ${ snippet }` );

		}

		return propertyName;

	}

}

const outputStruct = nodeProxy( OutputStructNode );

addNodeClass( 'OutputStructNode', OutputStructNode );

class HashNode extends Node {

	constructor( seedNode ) {

		super();

		this.seedNode = seedNode;

	}

	setup( /*builder*/ ) {

		// Taken from https://www.shadertoy.com/view/XlGcRh, originally from pcg-random.org

		const state = this.seedNode.toUint().mul( 747796405 ).add( 2891336453 );
		const word = state.shiftRight( state.shiftRight( 28 ).add( 4 ) ).bitXor( state ).mul( 277803737 );
		const result = word.shiftRight( 22 ).bitXor( word );

		return result.toFloat().mul( 1 / 2 ** 32 ); // Convert to range [0, 1)

	}

}

const hash = nodeProxy( HashNode );

addNodeElement( 'hash', hash );

addNodeClass( 'HashNode', HashNode );

// remapping functions https://iquilezles.org/articles/functions/
const parabola = ( x, k ) => pow( mul( 4.0, x.mul( sub( 1.0, x ) ) ), k );
const gain = ( x, k ) => x.lessThan( 0.5 ) ? parabola( x.mul( 2.0 ), k ).div( 2.0 ) : sub( 1.0, parabola( mul( sub( 1.0, x ), 2.0 ), k ).div( 2.0 ) );
const pcurve = ( x, a, b ) => pow( div( pow( x, a ), add( pow( x, a ), pow( sub( 1.0, x ), b ) ) ), 1.0 / a );
const sinc = ( x, k ) => sin( PI.mul( k.mul( x ).sub( 1.0 ) ) ).div( PI.mul( k.mul( x ).sub( 1.0 ) ) );


addNodeElement( 'parabola', parabola );
addNodeElement( 'gain', gain );
addNodeElement( 'pcurve', pcurve );
addNodeElement( 'sinc', sinc );

// https://github.com/cabbibo/glsl-tri-noise-3d


const tri = tslFn( ( [ x ] ) => {

	return x.fract().sub( .5 ).abs();

} );

const tri3 = tslFn( ( [ p ] ) => {

	return vec3( tri( p.z.add( tri( p.y.mul( 1. ) ) ) ), tri( p.z.add( tri( p.x.mul( 1. ) ) ) ), tri( p.y.add( tri( p.x.mul( 1. ) ) ) ) );

} );

const triNoise3D = tslFn( ( [ p_immutable, spd, time ] ) => {

	const p = vec3( p_immutable ).toVar();
	const z = float( 1.4 ).toVar();
	const rz = float( 0.0 ).toVar();
	const bp = vec3( p ).toVar();

	loop( { start: float( 0.0 ), end: float( 3.0 ), type: 'float', condition: '<=' }, () => {

		const dg = vec3( tri3( bp.mul( 2.0 ) ) ).toVar();
		p.addAssign( dg.add( time.mul( float( 0.1 ).mul( spd ) ) ) );
		bp.mulAssign( 1.8 );
		z.mulAssign( 1.5 );
		p.mulAssign( 1.2 );

		const t = float( tri( p.z.add( tri( p.x.add( tri( p.y ) ) ) ) ) ).toVar();
		rz.addAssign( t.div( z ) );
		bp.addAssign( 0.14 );

	} );

	return rz;

} );

// layouts

tri.setLayout( {
	name: 'tri',
	type: 'float',
	inputs: [
		{ name: 'x', type: 'float' }
	]
} );

tri3.setLayout( {
	name: 'tri3',
	type: 'vec3',
	inputs: [
		{ name: 'p', type: 'vec3' }
	]
} );

triNoise3D.setLayout( {
	name: 'triNoise3D',
	type: 'float',
	inputs: [
		{ name: 'p', type: 'vec3' },
		{ name: 'spd', type: 'float' },
		{ name: 'time', type: 'float' }
	]
} );

let discardExpression;

class DiscardNode extends CondNode {

	constructor( condNode ) {

		discardExpression = discardExpression || expression( 'discard' );

		super( condNode, discardExpression );

	}

}

const inlineDiscard = nodeProxy( DiscardNode );
const discard = ( condNode ) => inlineDiscard( condNode ).append();
const Return = () => expression( 'return' ).append();

addNodeElement( 'discard', discard ); // @TODO: Check... this cause a little confusing using in chaining

addNodeClass( 'DiscardNode', DiscardNode );

class FunctionOverloadingNode extends Node {

	constructor( functionNodes = [], ...parametersNodes ) {

		super();

		this.functionNodes = functionNodes;
		this.parametersNodes = parametersNodes;

		this._candidateFnCall = null;

		this.global = true;

	}

	getNodeType() {

		return this.functionNodes[ 0 ].shaderNode.layout.type;

	}

	setup( builder ) {

		const params = this.parametersNodes;

		let candidateFnCall = this._candidateFnCall;

		if ( candidateFnCall === null ) {

			let candidateFn = null;
			let candidateScore = - 1;

			for ( const functionNode of this.functionNodes ) {

				const shaderNode = functionNode.shaderNode;
				const layout = shaderNode.layout;

				if ( layout === null ) {

					throw new Error( 'FunctionOverloadingNode: FunctionNode must be a layout.' );

				}

				const inputs = layout.inputs;

				if ( params.length === inputs.length ) {

					let score = 0;

					for ( let i = 0; i < params.length; i ++ ) {

						const param = params[ i ];
						const input = inputs[ i ];

						if ( param.getNodeType( builder ) === input.type ) {

							score ++;

						} else {

							score = 0;

						}

					}

					if ( score > candidateScore ) {

						candidateFn = functionNode;
						candidateScore = score;

					}

				}

			}

			this._candidateFnCall = candidateFnCall = candidateFn( ...params );

		}

		return candidateFnCall;

	}

}

const overloadingBaseFn = nodeProxy( FunctionOverloadingNode );

const overloadingFn = ( functionNodes ) => ( ...params ) => overloadingBaseFn( functionNodes, ...params );

addNodeClass( 'FunctionOverloadingNode', FunctionOverloadingNode );

class MatcapUVNode extends TempNode {

	constructor() {

		super( 'vec2' );

	}

	setup() {

		const x = vec3( positionViewDirection.z, 0, positionViewDirection.x.negate() ).normalize();
		const y = positionViewDirection.cross( x );

		return vec2( x.dot( transformedNormalView ), y.dot( transformedNormalView ) ).mul( 0.495 ).add( 0.5 ); // 0.495 to remove artifacts caused by undersized matcap disks

	}

}

const matcapUV = nodeImmutable( MatcapUVNode );

addNodeClass( 'MatcapUVNode', MatcapUVNode );

class TimerNode extends UniformNode {

	constructor( scope = TimerNode.LOCAL, scale = 1, value = 0 ) {

		super( value );

		this.scope = scope;
		this.scale = scale;

		this.updateType = NodeUpdateType.FRAME;

	}
	/*
	@TODO:
	getNodeType( builder ) {

		const scope = this.scope;

		if ( scope === TimerNode.FRAME ) {

			return 'uint';

		}

		return 'float';

	}
*/
	update( frame ) {

		const scope = this.scope;
		const scale = this.scale;

		if ( scope === TimerNode.LOCAL ) {

			this.value += frame.deltaTime * scale;

		} else if ( scope === TimerNode.DELTA ) {

			this.value = frame.deltaTime * scale;

		} else if ( scope === TimerNode.FRAME ) {

			this.value = frame.frameId;

		} else {

			// global

			this.value = frame.time * scale;

		}

	}

	serialize( data ) {

		super.serialize( data );

		data.scope = this.scope;
		data.scale = this.scale;

	}

	deserialize( data ) {

		super.deserialize( data );

		this.scope = data.scope;
		this.scale = data.scale;

	}

}

TimerNode.LOCAL = 'local';
TimerNode.GLOBAL = 'global';
TimerNode.DELTA = 'delta';
TimerNode.FRAME = 'frame';

// @TODO: add support to use node in timeScale
const timerLocal = ( timeScale, value = 0 ) => nodeObject( new TimerNode( TimerNode.LOCAL, timeScale, value ) );
const timerGlobal = ( timeScale, value = 0 ) => nodeObject( new TimerNode( TimerNode.GLOBAL, timeScale, value ) );
const timerDelta = ( timeScale, value = 0 ) => nodeObject( new TimerNode( TimerNode.DELTA, timeScale, value ) );
const frameId = nodeImmutable( TimerNode, TimerNode.FRAME ).toUint();

addNodeClass( 'TimerNode', TimerNode );

class OscNode extends Node {

	constructor( method = OscNode.SINE, timeNode = timerLocal() ) {

		super();

		this.method = method;
		this.timeNode = timeNode;

	}

	getNodeType( builder ) {

		return this.timeNode.getNodeType( builder );

	}

	setup() {

		const method = this.method;
		const timeNode = nodeObject( this.timeNode );

		let outputNode = null;

		if ( method === OscNode.SINE ) {

			outputNode = timeNode.add( 0.75 ).mul( Math.PI * 2 ).sin().mul( 0.5 ).add( 0.5 );

		} else if ( method === OscNode.SQUARE ) {

			outputNode = timeNode.fract().round();

		} else if ( method === OscNode.TRIANGLE ) {

			outputNode = timeNode.add( 0.5 ).fract().mul( 2 ).sub( 1 ).abs();

		} else if ( method === OscNode.SAWTOOTH ) {

			outputNode = timeNode.fract();

		}

		return outputNode;

	}

	serialize( data ) {

		super.serialize( data );

		data.method = this.method;

	}

	deserialize( data ) {

		super.deserialize( data );

		this.method = data.method;

	}

}

OscNode.SINE = 'sine';
OscNode.SQUARE = 'square';
OscNode.TRIANGLE = 'triangle';
OscNode.SAWTOOTH = 'sawtooth';

const oscSine = nodeProxy( OscNode, OscNode.SINE );
const oscSquare = nodeProxy( OscNode, OscNode.SQUARE );
const oscTriangle = nodeProxy( OscNode, OscNode.TRIANGLE );
const oscSawtooth = nodeProxy( OscNode, OscNode.SAWTOOTH );

addNodeClass( 'OscNode', OscNode );

class PackingNode extends TempNode {

	constructor( scope, node ) {

		super();

		this.scope = scope;
		this.node = node;

	}

	getNodeType( builder ) {

		return this.node.getNodeType( builder );

	}

	setup() {

		const { scope, node } = this;

		let result = null;

		if ( scope === PackingNode.DIRECTION_TO_COLOR ) {

			result = node.mul( 0.5 ).add( 0.5 );

		} else if ( scope === PackingNode.COLOR_TO_DIRECTION ) {

			result = node.mul( 2.0 ).sub( 1 );

		}

		return result;

	}

}

PackingNode.DIRECTION_TO_COLOR = 'directionToColor';
PackingNode.COLOR_TO_DIRECTION = 'colorToDirection';

const directionToColor = nodeProxy( PackingNode, PackingNode.DIRECTION_TO_COLOR );
const colorToDirection = nodeProxy( PackingNode, PackingNode.COLOR_TO_DIRECTION );

addNodeElement( 'directionToColor', directionToColor );
addNodeElement( 'colorToDirection', colorToDirection );

addNodeClass( 'PackingNode', PackingNode );

class RemapNode extends Node {

	constructor( node, inLowNode, inHighNode, outLowNode = float( 0 ), outHighNode = float( 1 ) ) {

		super();

		this.node = node;
		this.inLowNode = inLowNode;
		this.inHighNode = inHighNode;
		this.outLowNode = outLowNode;
		this.outHighNode = outHighNode;

		this.doClamp = true;

	}

	setup() {

		const { node, inLowNode, inHighNode, outLowNode, outHighNode, doClamp } = this;

		let t = node.sub( inLowNode ).div( inHighNode.sub( inLowNode ) );

		if ( doClamp === true ) t = t.clamp();

		return t.mul( outHighNode.sub( outLowNode ) ).add( outLowNode );

	}

}

const remap = nodeProxy( RemapNode, null, null, { doClamp: false } );
const remapClamp = nodeProxy( RemapNode );

addNodeElement( 'remap', remap );
addNodeElement( 'remapClamp', remapClamp );

addNodeClass( 'RemapNode', RemapNode );

class RotateUVNode extends TempNode {

	constructor( uvNode, rotationNode, centerNode = vec2( 0.5 ) ) {

		super( 'vec2' );

		this.uvNode = uvNode;
		this.rotationNode = rotationNode;
		this.centerNode = centerNode;

	}

	setup() {

		const { uvNode, rotationNode, centerNode } = this;

		const vector = uvNode.sub( centerNode );

		return vector.rotate( rotationNode ).add( centerNode );

	}

}

const rotateUV = nodeProxy( RotateUVNode );

addNodeElement( 'rotateUV', rotateUV );

addNodeClass( 'RotateUVNode', RotateUVNode );

class RotateNode extends TempNode {

	constructor( positionNode, rotationNode ) {

		super();

		this.positionNode = positionNode;
		this.rotationNode = rotationNode;

	}

	getNodeType( builder ) {

		return this.positionNode.getNodeType( builder );

	}

	setup( builder ) {

		const { rotationNode, positionNode } = this;

		const nodeType = this.getNodeType( builder );

		if ( nodeType === 'vec2' ) {

			const cosAngle = rotationNode.cos();
			const sinAngle = rotationNode.sin();

			const rotationMatrix = mat2(
				cosAngle, sinAngle,
				sinAngle.negate(), cosAngle
			);

			return rotationMatrix.mul( positionNode );

		} else {

			const rotation = rotationNode;
			const rotationXMatrix = mat4( vec4( 1.0, 0.0, 0.0, 0.0 ), vec4( 0.0, cos( rotation.x ), sin( rotation.x ).negate(), 0.0 ), vec4( 0.0, sin( rotation.x ), cos( rotation.x ), 0.0 ), vec4( 0.0, 0.0, 0.0, 1.0 ) );
			const rotationYMatrix = mat4( vec4( cos( rotation.y ), 0.0, sin( rotation.y ), 0.0 ), vec4( 0.0, 1.0, 0.0, 0.0 ), vec4( sin( rotation.y ).negate(), 0.0, cos( rotation.y ), 0.0 ), vec4( 0.0, 0.0, 0.0, 1.0 ) );
			const rotationZMatrix = mat4( vec4( cos( rotation.z ), sin( rotation.z ).negate(), 0.0, 0.0 ), vec4( sin( rotation.z ), cos( rotation.z ), 0.0, 0.0 ), vec4( 0.0, 0.0, 1.0, 0.0 ), vec4( 0.0, 0.0, 0.0, 1.0 ) );

			return rotationXMatrix.mul( rotationYMatrix ).mul( rotationZMatrix ).mul( vec4( positionNode, 1.0 ) ).xyz;

		}

	}

}

const rotate = nodeProxy( RotateNode );

addNodeElement( 'rotate', rotate );

addNodeClass( 'RotateNode', RotateNode );

class SpriteSheetUVNode extends Node {

	constructor( countNode, uvNode = uv(), frameNode = float( 0 ) ) {

		super( 'vec2' );

		this.countNode = countNode;
		this.uvNode = uvNode;
		this.frameNode = frameNode;

	}

	setup() {

		const { frameNode, uvNode, countNode } = this;

		const { width, height } = countNode;

		const frameNum = frameNode.mod( width.mul( height ) ).floor();

		const column = frameNum.mod( width );
		const row = height.sub( frameNum.add( 1 ).div( width ).ceil() );

		const scale = countNode.reciprocal();
		const uvFrameOffset = vec2( column, row );

		return uvNode.add( uvFrameOffset ).mul( scale );

	}

}

const spritesheetUV = nodeProxy( SpriteSheetUVNode );

addNodeClass( 'SpriteSheetUVNode', SpriteSheetUVNode );

class StorageArrayElementNode extends ArrayElementNode {

	constructor( storageBufferNode, indexNode ) {

		super( storageBufferNode, indexNode );

		this.isStorageArrayElementNode = true;

	}

	set storageBufferNode( value ) {

		this.node = value;

	}

	get storageBufferNode() {

		return this.node;

	}

	setup( builder ) {

		if ( builder.isAvailable( 'storageBuffer' ) === false ) {

			if ( ! this.node.instanceIndex && this.node.bufferObject === true ) {

				builder.setupPBO( this.node );

			}

		}

		return super.setup( builder );

	}

	generate( builder, output ) {

		let snippet;

		const isAssignContext = builder.context.assign;

		//

		if ( builder.isAvailable( 'storageBuffer' ) === false ) {

			const { node } = this;

			if ( ! node.instanceIndex && this.node.bufferObject === true && isAssignContext !== true ) {

				snippet = builder.generatePBO( this );

			} else {

				snippet = node.build( builder );

			}

		} else {

			snippet = super.generate( builder );

		}

		if ( isAssignContext !== true ) {

			const type = this.getNodeType( builder );

			snippet = builder.format( snippet, type, output );

		}

		return snippet;

	}

}

const storageElement = nodeProxy( StorageArrayElementNode );

addNodeElement( 'storageElement', storageElement );

addNodeClass( 'StorageArrayElementNode', StorageArrayElementNode );

class TriplanarTexturesNode extends Node {

	constructor( textureXNode, textureYNode = null, textureZNode = null, scaleNode = float( 1 ), positionNode = positionLocal, normalNode = normalLocal ) {

		super( 'vec4' );

		this.textureXNode = textureXNode;
		this.textureYNode = textureYNode;
		this.textureZNode = textureZNode;

		this.scaleNode = scaleNode;

		this.positionNode = positionNode;
		this.normalNode = normalNode;

	}

	setup() {

		const { textureXNode, textureYNode, textureZNode, scaleNode, positionNode, normalNode } = this;

		// Ref: https://github.com/keijiro/StandardTriplanar

		// Blending factor of triplanar mapping
		let bf = normalNode.abs().normalize();
		bf = bf.div( bf.dot( vec3( 1.0 ) ) );

		// Triplanar mapping
		const tx = positionNode.yz.mul( scaleNode );
		const ty = positionNode.zx.mul( scaleNode );
		const tz = positionNode.xy.mul( scaleNode );

		// Base color
		const textureX = textureXNode.value;
		const textureY = textureYNode !== null ? textureYNode.value : textureX;
		const textureZ = textureZNode !== null ? textureZNode.value : textureX;

		const cx = texture( textureX, tx ).mul( bf.x );
		const cy = texture( textureY, ty ).mul( bf.y );
		const cz = texture( textureZ, tz ).mul( bf.z );

		return add( cx, cy, cz );

	}

}

const triplanarTextures = nodeProxy( TriplanarTexturesNode );
const triplanarTexture = ( ...params ) => triplanarTextures( ...params );

addNodeElement( 'triplanarTexture', triplanarTexture );

addNodeClass( 'TriplanarTexturesNode', TriplanarTexturesNode );

const _reflectorPlane = new Plane();
const _normal = new Vector3();
const _reflectorWorldPosition = new Vector3();
const _cameraWorldPosition = new Vector3();
const _rotationMatrix = new Matrix4();
const _lookAtPosition = new Vector3( 0, 0, - 1 );
const clipPlane = new Vector4();

const _view = new Vector3();
const _target = new Vector3();
const _q = new Vector4();

const _size$4 = new Vector2();

const _defaultRT = new RenderTarget();
const _defaultUV = vec2( viewportTopLeft.x.oneMinus(), viewportTopLeft.y );

let _inReflector = false;

class ReflectorNode extends TextureNode {

	constructor( parameters = {} ) {

		super( _defaultRT.texture, _defaultUV );

		const {
			target = new Object3D(),
			resolution = 1,
			generateMipmaps = false,
			bounces = true
		} = parameters;

		//

		this.target = target;
		this.resolution = resolution;
		this.generateMipmaps = generateMipmaps;
		this.bounces = bounces;

		this.updateBeforeType = bounces ? NodeUpdateType.RENDER : NodeUpdateType.FRAME;

		this.virtualCameras = new WeakMap();
		this.renderTargets = new WeakMap();


	}

	_updateResolution( renderTarget, renderer ) {

		const resolution = this.resolution;

		renderer.getDrawingBufferSize( _size$4 );

		renderTarget.setSize( Math.round( _size$4.width * resolution ), Math.round( _size$4.height * resolution ) );

	}

	setup( builder ) {

		this._updateResolution( _defaultRT, builder.renderer );

		return super.setup( builder );

	}

	getTextureNode() {

		return this.textureNode;

	}

	getVirtualCamera( camera ) {

		let virtualCamera = this.virtualCameras.get( camera );

		if ( virtualCamera === undefined ) {

			virtualCamera = camera.clone();

			this.virtualCameras.set( camera, virtualCamera );

		}

		return virtualCamera;

	}

	getRenderTarget( camera ) {

		let renderTarget = this.renderTargets.get( camera );

		if ( renderTarget === undefined ) {

			renderTarget = new RenderTarget( 0, 0, { type: HalfFloatType } );

			if ( this.generateMipmaps === true ) {

			    renderTarget.texture.minFilter = LinearMipMapLinearFilter;
			    renderTarget.texture.generateMipmaps = true;

			}

			this.renderTargets.set( camera, renderTarget );

		}

		return renderTarget;

	}

	updateBefore( frame ) {

		if ( this.bounces === false && _inReflector ) return false;

		_inReflector = true;

		const { scene, camera, renderer, material } = frame;
		const { target } = this;

		const virtualCamera = this.getVirtualCamera( camera );
		const renderTarget = this.getRenderTarget( virtualCamera );

		renderer.getDrawingBufferSize( _size$4 );

		this._updateResolution( renderTarget, renderer );

		//

		_reflectorWorldPosition.setFromMatrixPosition( target.matrixWorld );
		_cameraWorldPosition.setFromMatrixPosition( camera.matrixWorld );

		_rotationMatrix.extractRotation( target.matrixWorld );

		_normal.set( 0, 0, 1 );
		_normal.applyMatrix4( _rotationMatrix );

		_view.subVectors( _reflectorWorldPosition, _cameraWorldPosition );

		// Avoid rendering when reflector is facing away

		if ( _view.dot( _normal ) > 0 ) return;

		_view.reflect( _normal ).negate();
		_view.add( _reflectorWorldPosition );

		_rotationMatrix.extractRotation( camera.matrixWorld );

		_lookAtPosition.set( 0, 0, - 1 );
		_lookAtPosition.applyMatrix4( _rotationMatrix );
		_lookAtPosition.add( _cameraWorldPosition );

		_target.subVectors( _reflectorWorldPosition, _lookAtPosition );
		_target.reflect( _normal ).negate();
		_target.add( _reflectorWorldPosition );

		//

		virtualCamera.coordinateSystem = camera.coordinateSystem;
		virtualCamera.position.copy( _view );
		virtualCamera.up.set( 0, 1, 0 );
		virtualCamera.up.applyMatrix4( _rotationMatrix );
		virtualCamera.up.reflect( _normal );
		virtualCamera.lookAt( _target );

		virtualCamera.near = camera.near;
		virtualCamera.far = camera.far;

		virtualCamera.updateMatrixWorld();
		virtualCamera.projectionMatrix.copy( camera.projectionMatrix );

		// Now update projection matrix with new clip plane, implementing code from: http://www.terathon.com/code/oblique.html
		// Paper explaining this technique: http://www.terathon.com/lengyel/Lengyel-Oblique.pdf
		_reflectorPlane.setFromNormalAndCoplanarPoint( _normal, _reflectorWorldPosition );
		_reflectorPlane.applyMatrix4( virtualCamera.matrixWorldInverse );

		clipPlane.set( _reflectorPlane.normal.x, _reflectorPlane.normal.y, _reflectorPlane.normal.z, _reflectorPlane.constant );

		const projectionMatrix = virtualCamera.projectionMatrix;

		_q.x = ( Math.sign( clipPlane.x ) + projectionMatrix.elements[ 8 ] ) / projectionMatrix.elements[ 0 ];
		_q.y = ( Math.sign( clipPlane.y ) + projectionMatrix.elements[ 9 ] ) / projectionMatrix.elements[ 5 ];
		_q.z = - 1.0;
		_q.w = ( 1.0 + projectionMatrix.elements[ 10 ] ) / projectionMatrix.elements[ 14 ];

		// Calculate the scaled plane vector
		clipPlane.multiplyScalar( 1.0 / clipPlane.dot( _q ) );

		const clipBias = 0;

		// Replacing the third row of the projection matrix
		projectionMatrix.elements[ 2 ] = clipPlane.x;
		projectionMatrix.elements[ 6 ] = clipPlane.y;
		projectionMatrix.elements[ 10 ] = clipPlane.z - clipBias;
		projectionMatrix.elements[ 14 ] = clipPlane.w;

		//

		this.value = renderTarget.texture;

		material.visible = false;

		const currentRenderTarget = renderer.getRenderTarget();

		renderer.setRenderTarget( renderTarget );

		renderer.render( scene, virtualCamera );

		renderer.setRenderTarget( currentRenderTarget );

		material.visible = true;

		_inReflector = false;

	}

}

const reflector = ( parameters ) => nodeObject( new ReflectorNode( parameters ) );

// Helper for passes that need to fill the viewport with a single quad.

const _camera = new OrthographicCamera( - 1, 1, 1, - 1, 0, 1 );

// https://github.com/mrdoob/three.js/pull/21358

class QuadGeometry extends BufferGeometry {

	constructor( flipY = false ) {

		super();

		const uv = flipY === false ? [ 0, - 1, 0, 1, 2, 1 ] : [ 0, 2, 0, 0, 2, 0 ];

		this.setAttribute( 'position', new Float32BufferAttribute( [ - 1, 3, 0, - 1, - 1, 0, 3, - 1, 0 ], 3 ) );
		this.setAttribute( 'uv', new Float32BufferAttribute( uv, 2 ) );

	}

}

const _geometry = new QuadGeometry();

class QuadMesh extends Mesh {

	constructor( material = null ) {

		super( _geometry, material );

		this.camera = _camera;

	}

	renderAsync( renderer ) {

		return renderer.renderAsync( this, _camera );

	}

	render( renderer ) {

		renderer.render( this, _camera );

	}

}

const _size$3 = new Vector2();

class RTTNode extends TextureNode {

	constructor( node, width = null, height = null, options = { type: HalfFloatType } ) {

		const renderTarget = new RenderTarget( width, height, options );

		super( renderTarget.texture, uv() );

		this.node = node;
		this.width = width;
		this.height = height;

		this.renderTarget = renderTarget;

		this.textureNeedsUpdate = true;
		this.autoUpdate = true;

		this.updateMap = new WeakMap();

		this._rttNode = null;
		this._quadMesh = new QuadMesh( new NodeMaterial() );

		this.updateBeforeType = NodeUpdateType.RENDER;

	}

	get autoSize() {

		return this.width === null;

	}

	setup( builder ) {

		this._rttNode = this.node.context( builder.getSharedContext() );
		this._quadMesh.material.needsUpdate = true;

		return super.setup( builder );

	}

	setSize( width, height ) {

		this.width = width;
		this.height = height;

		const effectiveWidth = width * this.pixelRatio;
		const effectiveHeight = height * this.pixelRatio;

		this.renderTarget.setSize( effectiveWidth, effectiveHeight );

		this.textureNeedsUpdate = true;

	}

	setPixelRatio( pixelRatio ) {

		this.pixelRatio = pixelRatio;

		this.setSize( this.width, this.height );

	}

	updateBefore( { renderer } ) {

		if ( this.textureNeedsUpdate === false && this.autoUpdate === false ) return;

		this.textureNeedsUpdate = false;

		//

		if ( this.autoSize === true ) {

			this.pixelRatio = renderer.getPixelRatio();

			const size = renderer.getSize( _size$3 );

			this.setSize( size.width, size.height );

		}

		//

		this._quadMesh.material.fragmentNode = this._rttNode;

		//

		const currentRenderTarget = renderer.getRenderTarget();

		renderer.setRenderTarget( this.renderTarget );

		this._quadMesh.render( renderer );

		renderer.setRenderTarget( currentRenderTarget );

	}

	clone() {

		const newNode = new TextureNode( this.value, this.uvNode, this.levelNode );
		newNode.sampler = this.sampler;
		newNode.referenceNode = this;

		return newNode;

	}

}

const rtt = ( node, ...params ) => nodeObject( new RTTNode( nodeObject( node ), ...params ) );

addNodeElement( 'toTexture', ( node, ...params ) => node.isTextureNode ? node : rtt( node, ...params ) );

addNodeClass( 'RTTNode', RTTNode );

const getBitangent = ( crossNormalTangent ) => crossNormalTangent.mul( tangentGeometry.w ).xyz;

const bitangentGeometry = /*#__PURE__*/ varying( getBitangent( normalGeometry.cross( tangentGeometry ) ), 'v_bitangentGeometry' ).normalize().toVar( 'bitangentGeometry' );
const bitangentLocal = /*#__PURE__*/ varying( getBitangent( normalLocal.cross( tangentLocal ) ), 'v_bitangentLocal' ).normalize().toVar( 'bitangentLocal' );
const bitangentView = /*#__PURE__*/ varying( getBitangent( normalView.cross( tangentView ) ), 'v_bitangentView' ).normalize().toVar( 'bitangentView' );
const bitangentWorld = /*#__PURE__*/ varying( getBitangent( normalWorld.cross( tangentWorld ) ), 'v_bitangentWorld' ).normalize().toVar( 'bitangentWorld' );
const transformedBitangentView = /*#__PURE__*/ getBitangent( transformedNormalView.cross( transformedTangentView ) ).normalize().toVar( 'transformedBitangentView' );
const transformedBitangentWorld = /*#__PURE__*/ transformedBitangentView.transformDirection( cameraViewMatrix ).normalize().toVar( 'transformedBitangentWorld' );

const TBNViewMatrix = mat3( tangentView, bitangentView, normalView );

const parallaxDirection = positionViewDirection.mul( TBNViewMatrix )/*.normalize()*/;
const parallaxUV = ( uv, scale ) => uv.sub( parallaxDirection.mul( scale ) );

const transformedBentNormalView = ( () => {

	// https://google.github.io/filament/Filament.md.html#lighting/imagebasedlights/anisotropy

	let bentNormal = anisotropyB.cross( positionViewDirection );
	bentNormal = bentNormal.cross( anisotropyB ).normalize();
	bentNormal = mix( bentNormal, transformedNormalView, anisotropy.mul( roughness.oneMinus() ).oneMinus().pow2().pow2() ).normalize();

	return bentNormal;


} )();

class VertexColorNode extends AttributeNode {

	constructor( index = 0 ) {

		super( null, 'vec4' );

		this.isVertexColorNode = true;

		this.index = index;

	}

	getAttributeName( /*builder*/ ) {

		const index = this.index;

		return 'color' + ( index > 0 ? index : '' );

	}

	generate( builder ) {

		const attributeName = this.getAttributeName( builder );
		const geometryAttribute = builder.hasGeometryAttribute( attributeName );

		let result;

		if ( geometryAttribute === true ) {

			result = super.generate( builder );

		} else {

			// Vertex color fallback should be white
			result = builder.generateConst( this.nodeType, new Vector4( 1, 1, 1, 1 ) );

		}

		return result;

	}

	serialize( data ) {

		super.serialize( data );

		data.index = this.index;

	}

	deserialize( data ) {

		super.deserialize( data );

		this.index = data.index;

	}

}

const vertexColor = ( ...params ) => nodeObject( new VertexColorNode( ...params ) );

addNodeClass( 'VertexColorNode', VertexColorNode );

class RendererReferenceNode extends ReferenceNode {

	constructor( property, inputType, renderer = null ) {

		super( property, inputType, renderer );

		this.renderer = renderer;

	}

	updateReference( state ) {

		this.reference = this.renderer !== null ? this.renderer : state.renderer;

		return this.reference;

	}

}

const rendererReference = ( name, type, renderer ) => nodeObject( new RendererReferenceNode( name, type, renderer ) );

addNodeClass( 'RendererReferenceNode', RendererReferenceNode );

// Mipped Bicubic Texture Filtering by N8
// https://www.shadertoy.com/view/Dl2SDW

const bC = 1.0 / 6.0;

const w0 = ( a ) => mul( bC, mul( a, mul( a, a.negate().add( 3.0 ) ).sub( 3.0 ) ).add( 1.0 ) );

const w1 = ( a ) => mul( bC, mul( a, mul( a, mul( 3.0, a ).sub( 6.0 ) ) ).add( 4.0 ) );

const w2 = ( a ) => mul( bC, mul( a, mul( a, mul( - 3.0, a ).add( 3.0 ) ).add( 3.0 ) ).add( 1.0 ) );

const w3 = ( a ) => mul( bC, pow( a, 3 ) );

const g0 = ( a ) => w0( a ).add( w1( a ) );

const g1 = ( a ) => w2( a ).add( w3( a ) );

// h0 and h1 are the two offset functions
const h0 = ( a ) => add( - 1.0, w1( a ).div( w0( a ).add( w1( a ) ) ) );

const h1 = ( a ) => add( 1.0, w3( a ).div( w2( a ).add( w3( a ) ) ) );

const bicubic = ( textureNode, texelSize, lod ) => {

	const uv = textureNode.uvNode;
	const uvScaled = mul( uv, texelSize.zw ).add( 0.5 );

	const iuv = floor( uvScaled );
	const fuv = fract( uvScaled );

	const g0x = g0( fuv.x );
	const g1x = g1( fuv.x );
	const h0x = h0( fuv.x );
	const h1x = h1( fuv.x );
	const h0y = h0( fuv.y );
	const h1y = h1( fuv.y );

	const p0 = vec2( iuv.x.add( h0x ), iuv.y.add( h0y ) ).sub( 0.5 ).mul( texelSize.xy );
	const p1 = vec2( iuv.x.add( h1x ), iuv.y.add( h0y ) ).sub( 0.5 ).mul( texelSize.xy );
	const p2 = vec2( iuv.x.add( h0x ), iuv.y.add( h1y ) ).sub( 0.5 ).mul( texelSize.xy );
	const p3 = vec2( iuv.x.add( h1x ), iuv.y.add( h1y ) ).sub( 0.5 ).mul( texelSize.xy );

	const a = g0( fuv.y ).mul( add( g0x.mul( textureNode.uv( p0 ).level( lod ) ), g1x.mul( textureNode.uv( p1 ).level( lod ) ) ) );
	const b = g1( fuv.y ).mul( add( g0x.mul( textureNode.uv( p2 ).level( lod ) ), g1x.mul( textureNode.uv( p3 ).level( lod ) ) ) );

	return a.add( b );

};

const textureBicubicMethod = ( textureNode, lodNode ) => {

	const fLodSize = vec2( textureNode.size( int( lodNode ) ) );
	const cLodSize = vec2( textureNode.size( int( lodNode.add( 1.0 ) ) ) );
	const fLodSizeInv = div( 1.0, fLodSize );
	const cLodSizeInv = div( 1.0, cLodSize );
	const fSample = bicubic( textureNode, vec4( fLodSizeInv, fLodSize ), floor( lodNode ) );
	const cSample = bicubic( textureNode, vec4( cLodSizeInv, cLodSize ), ceil( lodNode ) );

	return fract( lodNode ).mix( fSample, cSample );

};

class TextureBicubicNode extends TempNode {

	constructor( textureNode, blurNode = float( 3 ) ) {

		super( 'vec4' );

		this.textureNode = textureNode;
		this.blurNode = blurNode;

	}

	setup() {

		return textureBicubicMethod( this.textureNode, this.blurNode );

	}

}

const textureBicubic = nodeProxy( TextureBicubicNode );

addNodeElement( 'bicubic', textureBicubic );

addNodeClass( 'TextureBicubicNode', TextureBicubicNode );

class PointUVNode extends Node {

	constructor() {

		super( 'vec2' );

		this.isPointUVNode = true;

	}

	generate( /*builder*/ ) {

		return 'vec2( gl_PointCoord.x, 1.0 - gl_PointCoord.y )';

	}

}

const pointUV = nodeImmutable( PointUVNode );

addNodeClass( 'PointUVNode', PointUVNode );

class SceneNode extends Node {

	constructor( scope = SceneNode.BACKGROUND_BLURRINESS, scene = null ) {

		super();

		this.scope = scope;
		this.scene = scene;

	}

	setup( builder ) {

		const scope = this.scope;
		const scene = this.scene !== null ? this.scene : builder.scene;

		let output;

		if ( scope === SceneNode.BACKGROUND_BLURRINESS ) {

			output = reference( 'backgroundBlurriness', 'float', scene );

		} else if ( scope === SceneNode.BACKGROUND_INTENSITY ) {

			output = reference( 'backgroundIntensity', 'float', scene );

		} else {

			console.error( 'THREE.SceneNode: Unknown scope:', scope );

		}

		return output;

	}

}

SceneNode.BACKGROUND_BLURRINESS = 'backgroundBlurriness';
SceneNode.BACKGROUND_INTENSITY = 'backgroundIntensity';

const backgroundBlurriness = nodeImmutable( SceneNode, SceneNode.BACKGROUND_BLURRINESS );
const backgroundIntensity = nodeImmutable( SceneNode, SceneNode.BACKGROUND_INTENSITY );

addNodeClass( 'SceneNode', SceneNode );

const GPUPrimitiveTopology = {
	PointList: 'point-list',
	LineList: 'line-list',
	LineStrip: 'line-strip',
	TriangleList: 'triangle-list',
	TriangleStrip: 'triangle-strip',
};

const GPUCompareFunction = {
	Never: 'never',
	Less: 'less',
	Equal: 'equal',
	LessEqual: 'less-equal',
	Greater: 'greater',
	NotEqual: 'not-equal',
	GreaterEqual: 'greater-equal',
	Always: 'always'
};

const GPUStoreOp = {
	Store: 'store',
	Discard: 'discard'
};

const GPULoadOp = {
	Load: 'load',
	Clear: 'clear'
};

const GPUFrontFace = {
	CCW: 'ccw',
	CW: 'cw'
};

const GPUCullMode = {
	None: 'none',
	Front: 'front',
	Back: 'back'
};

const GPUIndexFormat = {
	Uint16: 'uint16',
	Uint32: 'uint32'
};

const GPUTextureFormat = {

	// 8-bit formats

	R8Unorm: 'r8unorm',
	R8Snorm: 'r8snorm',
	R8Uint: 'r8uint',
	R8Sint: 'r8sint',

	// 16-bit formats

	R16Uint: 'r16uint',
	R16Sint: 'r16sint',
	R16Float: 'r16float',
	RG8Unorm: 'rg8unorm',
	RG8Snorm: 'rg8snorm',
	RG8Uint: 'rg8uint',
	RG8Sint: 'rg8sint',

	// 32-bit formats

	R32Uint: 'r32uint',
	R32Sint: 'r32sint',
	R32Float: 'r32float',
	RG16Uint: 'rg16uint',
	RG16Sint: 'rg16sint',
	RG16Float: 'rg16float',
	RGBA8Unorm: 'rgba8unorm',
	RGBA8UnormSRGB: 'rgba8unorm-srgb',
	RGBA8Snorm: 'rgba8snorm',
	RGBA8Uint: 'rgba8uint',
	RGBA8Sint: 'rgba8sint',
	BGRA8Unorm: 'bgra8unorm',
	BGRA8UnormSRGB: 'bgra8unorm-srgb',
	// Packed 32-bit formats
	RGB9E5UFloat: 'rgb9e5ufloat',
	RGB10A2Unorm: 'rgb10a2unorm',
	RG11B10uFloat: 'rgb10a2unorm',

	// 64-bit formats

	RG32Uint: 'rg32uint',
	RG32Sint: 'rg32sint',
	RG32Float: 'rg32float',
	RGBA16Uint: 'rgba16uint',
	RGBA16Sint: 'rgba16sint',
	RGBA16Float: 'rgba16float',

	// 128-bit formats

	RGBA32Uint: 'rgba32uint',
	RGBA32Sint: 'rgba32sint',
	RGBA32Float: 'rgba32float',

	// Depth and stencil formats

	Stencil8: 'stencil8',
	Depth16Unorm: 'depth16unorm',
	Depth24Plus: 'depth24plus',
	Depth24PlusStencil8: 'depth24plus-stencil8',
	Depth32Float: 'depth32float',

	// 'depth32float-stencil8' extension

	Depth32FloatStencil8: 'depth32float-stencil8',

	// BC compressed formats usable if 'texture-compression-bc' is both
	// supported by the device/user agent and enabled in requestDevice.

	BC1RGBAUnorm: 'bc1-rgba-unorm',
	BC1RGBAUnormSRGB: 'bc1-rgba-unorm-srgb',
	BC2RGBAUnorm: 'bc2-rgba-unorm',
	BC2RGBAUnormSRGB: 'bc2-rgba-unorm-srgb',
	BC3RGBAUnorm: 'bc3-rgba-unorm',
	BC3RGBAUnormSRGB: 'bc3-rgba-unorm-srgb',
	BC4RUnorm: 'bc4-r-unorm',
	BC4RSnorm: 'bc4-r-snorm',
	BC5RGUnorm: 'bc5-rg-unorm',
	BC5RGSnorm: 'bc5-rg-snorm',
	BC6HRGBUFloat: 'bc6h-rgb-ufloat',
	BC6HRGBFloat: 'bc6h-rgb-float',
	BC7RGBAUnorm: 'bc7-rgba-unorm',
	BC7RGBAUnormSRGB: 'bc7-rgba-srgb',

	// ETC2 compressed formats usable if 'texture-compression-etc2' is both
	// supported by the device/user agent and enabled in requestDevice.

	ETC2RGB8Unorm: 'etc2-rgb8unorm',
	ETC2RGB8UnormSRGB: 'etc2-rgb8unorm-srgb',
	ETC2RGB8A1Unorm: 'etc2-rgb8a1unorm',
	ETC2RGB8A1UnormSRGB: 'etc2-rgb8a1unorm-srgb',
	ETC2RGBA8Unorm: 'etc2-rgba8unorm',
	ETC2RGBA8UnormSRGB: 'etc2-rgba8unorm-srgb',
	EACR11Unorm: 'eac-r11unorm',
	EACR11Snorm: 'eac-r11snorm',
	EACRG11Unorm: 'eac-rg11unorm',
	EACRG11Snorm: 'eac-rg11snorm',

	// ASTC compressed formats usable if 'texture-compression-astc' is both
	// supported by the device/user agent and enabled in requestDevice.

	ASTC4x4Unorm: 'astc-4x4-unorm',
	ASTC4x4UnormSRGB: 'astc-4x4-unorm-srgb',
	ASTC5x4Unorm: 'astc-5x4-unorm',
	ASTC5x4UnormSRGB: 'astc-5x4-unorm-srgb',
	ASTC5x5Unorm: 'astc-5x5-unorm',
	ASTC5x5UnormSRGB: 'astc-5x5-unorm-srgb',
	ASTC6x5Unorm: 'astc-6x5-unorm',
	ASTC6x5UnormSRGB: 'astc-6x5-unorm-srgb',
	ASTC6x6Unorm: 'astc-6x6-unorm',
	ASTC6x6UnormSRGB: 'astc-6x6-unorm-srgb',
	ASTC8x5Unorm: 'astc-8x5-unorm',
	ASTC8x5UnormSRGB: 'astc-8x5-unorm-srgb',
	ASTC8x6Unorm: 'astc-8x6-unorm',
	ASTC8x6UnormSRGB: 'astc-8x6-unorm-srgb',
	ASTC8x8Unorm: 'astc-8x8-unorm',
	ASTC8x8UnormSRGB: 'astc-8x8-unorm-srgb',
	ASTC10x5Unorm: 'astc-10x5-unorm',
	ASTC10x5UnormSRGB: 'astc-10x5-unorm-srgb',
	ASTC10x6Unorm: 'astc-10x6-unorm',
	ASTC10x6UnormSRGB: 'astc-10x6-unorm-srgb',
	ASTC10x8Unorm: 'astc-10x8-unorm',
	ASTC10x8UnormSRGB: 'astc-10x8-unorm-srgb',
	ASTC10x10Unorm: 'astc-10x10-unorm',
	ASTC10x10UnormSRGB: 'astc-10x10-unorm-srgb',
	ASTC12x10Unorm: 'astc-12x10-unorm',
	ASTC12x10UnormSRGB: 'astc-12x10-unorm-srgb',
	ASTC12x12Unorm: 'astc-12x12-unorm',
	ASTC12x12UnormSRGB: 'astc-12x12-unorm-srgb',

};

const GPUAddressMode = {
	ClampToEdge: 'clamp-to-edge',
	Repeat: 'repeat',
	MirrorRepeat: 'mirror-repeat'
};

const GPUFilterMode = {
	Linear: 'linear',
	Nearest: 'nearest'
};

const GPUBlendFactor = {
	Zero: 'zero',
	One: 'one',
	Src: 'src',
	OneMinusSrc: 'one-minus-src',
	SrcAlpha: 'src-alpha',
	OneMinusSrcAlpha: 'one-minus-src-alpha',
	Dst: 'dst',
	OneMinusDstColor: 'one-minus-dst',
	DstAlpha: 'dst-alpha',
	OneMinusDstAlpha: 'one-minus-dst-alpha',
	SrcAlphaSaturated: 'src-alpha-saturated',
	Constant: 'constant',
	OneMinusConstant: 'one-minus-constant'
};

const GPUBlendOperation = {
	Add: 'add',
	Subtract: 'subtract',
	ReverseSubtract: 'reverse-subtract',
	Min: 'min',
	Max: 'max'
};

const GPUColorWriteFlags = {
	None: 0,
	Red: 0x1,
	Green: 0x2,
	Blue: 0x4,
	Alpha: 0x8,
	All: 0xF
};

const GPUStencilOperation = {
	Keep: 'keep',
	Zero: 'zero',
	Replace: 'replace',
	Invert: 'invert',
	IncrementClamp: 'increment-clamp',
	DecrementClamp: 'decrement-clamp',
	IncrementWrap: 'increment-wrap',
	DecrementWrap: 'decrement-wrap'
};

const GPUBufferBindingType = {
	Uniform: 'uniform',
	Storage: 'storage',
	ReadOnlyStorage: 'read-only-storage'
};

const GPUStorageTextureAccess = {
	WriteOnly: 'write-only',
	ReadOnly: 'read-only',
	ReadWrite: 'read-write',
};

const GPUTextureSampleType = {
	Float: 'float',
	UnfilterableFloat: 'unfilterable-float',
	Depth: 'depth',
	SInt: 'sint',
	UInt: 'uint'
};

const GPUTextureDimension = {
	OneD: '1d',
	TwoD: '2d',
	ThreeD: '3d'
};

const GPUTextureViewDimension = {
	OneD: '1d',
	TwoD: '2d',
	TwoDArray: '2d-array',
	Cube: 'cube',
	CubeArray: 'cube-array',
	ThreeD: '3d'
};

const GPUTextureAspect = {
	All: 'all',
	StencilOnly: 'stencil-only',
	DepthOnly: 'depth-only'
};

const GPUInputStepMode = {
	Vertex: 'vertex',
	Instance: 'instance'
};

const GPUFeatureName = {
	DepthClipControl: 'depth-clip-control',
	Depth32FloatStencil8: 'depth32float-stencil8',
	TextureCompressionBC: 'texture-compression-bc',
	TextureCompressionETC2: 'texture-compression-etc2',
	TextureCompressionASTC: 'texture-compression-astc',
	TimestampQuery: 'timestamp-query',
	IndirectFirstInstance: 'indirect-first-instance',
	ShaderF16: 'shader-f16',
	RG11B10UFloat: 'rg11b10ufloat-renderable',
	BGRA8UNormStorage: 'bgra8unorm-storage',
	Float32Filterable: 'float32-filterable'
};

class StorageBufferNode extends BufferNode {

	constructor( value, bufferType, bufferCount = 0 ) {

		super( value, bufferType, bufferCount );

		this.isStorageBufferNode = true;

		this.access = GPUBufferBindingType.Storage;

		this.bufferObject = false;
		this.bufferCount = bufferCount;

		this._attribute = null;
		this._varying = null;

		this.global = true;

		if ( value.isStorageBufferAttribute !== true && value.isStorageInstancedBufferAttribute !== true ) {

			// TOOD: Improve it, possibly adding a new property to the BufferAttribute to identify it as a storage buffer read-only attribute in Renderer

			if ( value.isInstancedBufferAttribute ) value.isStorageInstancedBufferAttribute = true;
			else value.isStorageBufferAttribute = true;

		}

	}

	getHash( builder ) {

		if ( this.bufferCount === 0 ) {

			let bufferData = builder.globalCache.getData( this.value );

			if ( bufferData === undefined ) {

				bufferData = {
					node: this
				};

				builder.globalCache.setData( this.value, bufferData );

			}

			return bufferData.node.uuid;

		}

		return this.uuid;

	}

	getInputType( /*builder*/ ) {

		return 'storageBuffer';

	}

	element( indexNode ) {

		return storageElement( this, indexNode );

	}

	setBufferObject( value ) {

		this.bufferObject = value;

		return this;

	}

	setAccess( value ) {

		this.access = value;

		return this;

	}

	toReadOnly() {

		return this.setAccess( GPUBufferBindingType.ReadOnlyStorage );

	}

	generate( builder ) {

		if ( builder.isAvailable( 'storageBuffer' ) ) {

			return super.generate( builder );

		}

		const nodeType = this.getNodeType( builder );

		if ( this._attribute === null ) {

			this._attribute = bufferAttribute( this.value );
			this._varying = varying( this._attribute );

		}


		const output = this._varying.build( builder, nodeType );

		builder.registerTransform( output, this._attribute );

		return output;

	}

}

// Read-Write Storage
const storage = ( value, type, count ) => nodeObject( new StorageBufferNode( value, type, count ) );
const storageObject = ( value, type, count ) => nodeObject( new StorageBufferNode( value, type, count ).setBufferObject( true ) );

addNodeClass( 'StorageBufferNode', StorageBufferNode );

class StorageTextureNode extends TextureNode {

	constructor( value, uvNode, storeNode = null ) {

		super( value, uvNode );

		this.storeNode = storeNode;

		this.isStorageTextureNode = true;

		this.access = GPUStorageTextureAccess.WriteOnly;

	}

	getInputType( /*builder*/ ) {

		return 'storageTexture';

	}

	setup( builder ) {

		super.setup( builder );

		const properties = builder.getNodeProperties( this );
		properties.storeNode = this.storeNode;

	}

	setAccess( value ) {

		this.access = value;
		return this;

	}

	generate( builder, output ) {

		let snippet;

		if ( this.storeNode !== null ) {

			snippet = this.generateStore( builder );

		} else {

			snippet = super.generate( builder, output );

		}

		return snippet;

	}

	toReadOnly() {

		return this.setAccess( GPUStorageTextureAccess.ReadOnly );

	}

	toWriteOnly() {

		return this.setAccess( GPUStorageTextureAccess.WriteOnly );

	}

	generateStore( builder ) {

		const properties = builder.getNodeProperties( this );

		const { uvNode, storeNode } = properties;

		const textureProperty = super.generate( builder, 'property' );
		const uvSnippet = uvNode.build( builder, 'uvec2' );
		const storeSnippet = storeNode.build( builder, 'vec4' );

		const snippet = builder.generateTextureStore( builder, textureProperty, uvSnippet, storeSnippet );

		builder.addLineFlowCode( snippet );

	}

}

const storageTexture = nodeProxy( StorageTextureNode );

const textureStore = ( value, uvNode, storeNode ) => {

	const node = storageTexture( value, uvNode, storeNode );

	if ( storeNode !== null ) node.append();

	return node;

};

addNodeClass( 'StorageTextureNode', StorageTextureNode );

const normal = tslFn( ( { texture, uv } ) => {

	const epsilon = 0.0001;

	const ret = vec3().temp();

	If( uv.x.lessThan( epsilon ), () => {

		ret.assign( vec3( 1, 0, 0 ) );

	} ).elseif( uv.y.lessThan( epsilon ), () => {

		ret.assign( vec3( 0, 1, 0 ) );

	} ).elseif( uv.z.lessThan( epsilon ), () => {

		ret.assign( vec3( 0, 0, 1 ) );

	} ).elseif( uv.x.greaterThan( 1 - epsilon ), () => {

		ret.assign( vec3( - 1, 0, 0 ) );

	} ).elseif( uv.y.greaterThan( 1 - epsilon ), () => {

		ret.assign( vec3( 0, - 1, 0 ) );

	} ).elseif( uv.z.greaterThan( 1 - epsilon ), () => {

		ret.assign( vec3( 0, 0, - 1 ) );

	} ).else( () => {

		const step = 0.01;

		const x = texture.uv( uv.add( vec3( - step, 0.0, 0.0 ) ) ).r.sub( texture.uv( uv.add( vec3( step, 0.0, 0.0 ) ) ).r );
		const y = texture.uv( uv.add( vec3( 0.0, - step, 0.0 ) ) ).r.sub( texture.uv( uv.add( vec3( 0.0, step, 0.0 ) ) ).r );
		const z = texture.uv( uv.add( vec3( 0.0, 0.0, - step ) ) ).r.sub( texture.uv( uv.add( vec3( 0.0, 0.0, step ) ) ).r );

		ret.assign( vec3( x, y, z ) );

	} );

	return ret.normalize();

} );


class Texture3DNode extends TextureNode {

	constructor( value, uvNode = null, levelNode = null ) {

		super( value, uvNode, levelNode );

		this.isTexture3DNode = true;

	}

	getInputType( /*builder*/ ) {

		return 'texture3D';

	}

	getDefaultUV() {

		return vec3( 0.5, 0.5, 0.5 );

	}

	setUpdateMatrix( /*updateMatrix*/ ) { } // Ignore .updateMatrix for 3d TextureNode

	setupUV( builder, uvNode ) {

		return uvNode;

	}

	generateUV( builder, uvNode ) {

		return uvNode.build( builder, 'vec3' );

	}

	normal( uvNode ) {

		return normal( { texture: this, uv: uvNode } );

	}

}

const texture3D = nodeProxy( Texture3DNode );

addNodeClass( 'Texture3DNode', Texture3DNode );

class UserDataNode extends ReferenceNode {

	constructor( property, inputType, userData = null ) {

		super( property, inputType, userData );

		this.userData = userData;

	}

	update( frame ) {

		this.reference = this.userData !== null ? this.userData : frame.object.userData;

		super.update( frame );

	}

}

const userData = ( name, inputType, userData ) => nodeObject( new UserDataNode( name, inputType, userData ) );

addNodeClass( 'UserDataNode', UserDataNode );

const BurnNode = tslFn( ( { base, blend } ) => {

	const fn = ( c ) => blend[ c ].lessThan( EPSILON ).cond( blend[ c ], base[ c ].oneMinus().div( blend[ c ] ).oneMinus().max( 0 ) );

	return vec3( fn( 'x' ), fn( 'y' ), fn( 'z' ) );

} ).setLayout( {
	name: 'burnColor',
	type: 'vec3',
	inputs: [
		{ name: 'base', type: 'vec3' },
		{ name: 'blend', type: 'vec3' }
	]
} );

const DodgeNode = tslFn( ( { base, blend } ) => {

	const fn = ( c ) => blend[ c ].equal( 1.0 ).cond( blend[ c ], base[ c ].div( blend[ c ].oneMinus() ).max( 0 ) );

	return vec3( fn( 'x' ), fn( 'y' ), fn( 'z' ) );

} ).setLayout( {
	name: 'dodgeColor',
	type: 'vec3',
	inputs: [
		{ name: 'base', type: 'vec3' },
		{ name: 'blend', type: 'vec3' }
	]
} );

const ScreenNode = tslFn( ( { base, blend } ) => {

	const fn = ( c ) => base[ c ].oneMinus().mul( blend[ c ].oneMinus() ).oneMinus();

	return vec3( fn( 'x' ), fn( 'y' ), fn( 'z' ) );

} ).setLayout( {
	name: 'screenColor',
	type: 'vec3',
	inputs: [
		{ name: 'base', type: 'vec3' },
		{ name: 'blend', type: 'vec3' }
	]
} );

const OverlayNode = tslFn( ( { base, blend } ) => {

	const fn = ( c ) => base[ c ].lessThan( 0.5 ).cond( base[ c ].mul( blend[ c ], 2.0 ), base[ c ].oneMinus().mul( blend[ c ].oneMinus() ).oneMinus() );
	//const fn = ( c ) => mix( base[ c ].oneMinus().mul( blend[ c ].oneMinus() ).oneMinus(), base[ c ].mul( blend[ c ], 2.0 ), step( base[ c ], 0.5 ) );

	return vec3( fn( 'x' ), fn( 'y' ), fn( 'z' ) );

} ).setLayout( {
	name: 'overlayColor',
	type: 'vec3',
	inputs: [
		{ name: 'base', type: 'vec3' },
		{ name: 'blend', type: 'vec3' }
	]
} );

class BlendModeNode extends TempNode {

	constructor( blendMode, baseNode, blendNode ) {

		super();

		this.blendMode = blendMode;

		this.baseNode = baseNode;
		this.blendNode = blendNode;

	}

	setup() {

		const { blendMode, baseNode, blendNode } = this;
		const params = { base: baseNode, blend: blendNode };

		let outputNode = null;

		if ( blendMode === BlendModeNode.BURN ) {

			outputNode = BurnNode( params );

		} else if ( blendMode === BlendModeNode.DODGE ) {

			outputNode = DodgeNode( params );

		} else if ( blendMode === BlendModeNode.SCREEN ) {

			outputNode = ScreenNode( params );

		} else if ( blendMode === BlendModeNode.OVERLAY ) {

			outputNode = OverlayNode( params );

		}

		return outputNode;

	}

}

BlendModeNode.BURN = 'burn';
BlendModeNode.DODGE = 'dodge';
BlendModeNode.SCREEN = 'screen';
BlendModeNode.OVERLAY = 'overlay';

const burn = nodeProxy( BlendModeNode, BlendModeNode.BURN );
const dodge = nodeProxy( BlendModeNode, BlendModeNode.DODGE );
const overlay = nodeProxy( BlendModeNode, BlendModeNode.OVERLAY );
const screen = nodeProxy( BlendModeNode, BlendModeNode.SCREEN );

addNodeElement( 'burn', burn );
addNodeElement( 'dodge', dodge );
addNodeElement( 'overlay', overlay );
addNodeElement( 'screen', screen );

addNodeClass( 'BlendModeNode', BlendModeNode );

// Bump Mapping Unparametrized Surfaces on the GPU by Morten S. Mikkelsen
// https://mmikk.github.io/papers3d/mm_sfgrad_bump.pdf

const dHdxy_fwd = tslFn( ( { textureNode, bumpScale } ) => {

	// It's used to preserve the same TextureNode instance
	const sampleTexture = ( callback ) => textureNode.cache().context( { getUV: ( texNode ) => callback( texNode.uvNode || uv() ), forceUVContext: true } );

	const Hll = float( sampleTexture( ( uvNode ) => uvNode ) );

	return vec2(
		float( sampleTexture( ( uvNode ) => uvNode.add( uvNode.dFdx() ) ) ).sub( Hll ),
		float( sampleTexture( ( uvNode ) => uvNode.add( uvNode.dFdy() ) ) ).sub( Hll )
	).mul( bumpScale );

} );

// Evaluate the derivative of the height w.r.t. screen-space using forward differencing (listing 2)

const perturbNormalArb = tslFn( ( inputs ) => {

	const { surf_pos, surf_norm, dHdxy } = inputs;

	// normalize is done to ensure that the bump map looks the same regardless of the texture's scale
	const vSigmaX = surf_pos.dFdx().normalize();
	const vSigmaY = surf_pos.dFdy().normalize();
	const vN = surf_norm; // normalized

	const R1 = vSigmaY.cross( vN );
	const R2 = vN.cross( vSigmaX );

	const fDet = vSigmaX.dot( R1 ).mul( faceDirection );

	const vGrad = fDet.sign().mul( dHdxy.x.mul( R1 ).add( dHdxy.y.mul( R2 ) ) );

	return fDet.abs().mul( surf_norm ).sub( vGrad ).normalize();

} );

class BumpMapNode extends TempNode {

	constructor( textureNode, scaleNode = null ) {

		super( 'vec3' );

		this.textureNode = textureNode;
		this.scaleNode = scaleNode;

	}

	setup() {

		const bumpScale = this.scaleNode !== null ? this.scaleNode : 1;
		const dHdxy = dHdxy_fwd( { textureNode: this.textureNode, bumpScale } );

		return perturbNormalArb( {
			surf_pos: positionView,
			surf_norm: normalView,
			dHdxy
		} );

	}

}

const bumpMap = nodeProxy( BumpMapNode );

addNodeElement( 'bumpMap', bumpMap );

addNodeClass( 'BumpMapNode', BumpMapNode );

const saturationNode = tslFn( ( { color, adjustment } ) => {

	return adjustment.mix( luminance( color.rgb ), color.rgb );

} );

const vibranceNode = tslFn( ( { color, adjustment } ) => {

	const average = add( color.r, color.g, color.b ).div( 3.0 );

	const mx = color.r.max( color.g.max( color.b ) );
	const amt = mx.sub( average ).mul( adjustment ).mul( - 3.0 );

	return mix( color.rgb, mx, amt );

} );

const hueNode = tslFn( ( { color, adjustment } ) => {

	const k = vec3( 0.57735, 0.57735, 0.57735 );

	const cosAngle = adjustment.cos();

	return vec3( color.rgb.mul( cosAngle ).add( k.cross( color.rgb ).mul( adjustment.sin() ).add( k.mul( dot( k, color.rgb ).mul( cosAngle.oneMinus() ) ) ) ) );

} );

class ColorAdjustmentNode extends TempNode {

	constructor( method, colorNode, adjustmentNode = float( 1 ) ) {

		super( 'vec3' );

		this.method = method;

		this.colorNode = colorNode;
		this.adjustmentNode = adjustmentNode;

	}

	setup() {

		const { method, colorNode, adjustmentNode } = this;

		const callParams = { color: colorNode, adjustment: adjustmentNode };

		let outputNode = null;

		if ( method === ColorAdjustmentNode.SATURATION ) {

			outputNode = saturationNode( callParams );

		} else if ( method === ColorAdjustmentNode.VIBRANCE ) {

			outputNode = vibranceNode( callParams );

		} else if ( method === ColorAdjustmentNode.HUE ) {

			outputNode = hueNode( callParams );

		} else {

			console.error( `${ this.type }: Method "${ this.method }" not supported!` );

		}

		return outputNode;

	}

}

ColorAdjustmentNode.SATURATION = 'saturation';
ColorAdjustmentNode.VIBRANCE = 'vibrance';
ColorAdjustmentNode.HUE = 'hue';

const saturation = nodeProxy( ColorAdjustmentNode, ColorAdjustmentNode.SATURATION );
const vibrance = nodeProxy( ColorAdjustmentNode, ColorAdjustmentNode.VIBRANCE );
const hue = nodeProxy( ColorAdjustmentNode, ColorAdjustmentNode.HUE );

const lumaCoeffs = vec3( 0.2125, 0.7154, 0.0721 );
const luminance = ( color, luma = lumaCoeffs ) => dot( color, luma );

const threshold = ( color, threshold ) => mix( vec3( 0.0 ), color, luminance( color ).sub( threshold ).max( 0 ) );

addNodeElement( 'saturation', saturation );
addNodeElement( 'vibrance', vibrance );
addNodeElement( 'hue', hue );
addNodeElement( 'threshold', threshold );

addNodeClass( 'ColorAdjustmentNode', ColorAdjustmentNode );

// Normal Mapping Without Precomputed Tangents
// http://www.thetenthplanet.de/archives/1180

const perturbNormal2Arb = tslFn( ( inputs ) => {

	const { eye_pos, surf_norm, mapN, uv } = inputs;

	const q0 = eye_pos.dFdx();
	const q1 = eye_pos.dFdy();
	const st0 = uv.dFdx();
	const st1 = uv.dFdy();

	const N = surf_norm; // normalized

	const q1perp = q1.cross( N );
	const q0perp = N.cross( q0 );

	const T = q1perp.mul( st0.x ).add( q0perp.mul( st1.x ) );
	const B = q1perp.mul( st0.y ).add( q0perp.mul( st1.y ) );

	const det = T.dot( T ).max( B.dot( B ) );
	const scale = faceDirection.mul( det.inverseSqrt() );

	return add( T.mul( mapN.x, scale ), B.mul( mapN.y, scale ), N.mul( mapN.z ) ).normalize();

} );

class NormalMapNode extends TempNode {

	constructor( node, scaleNode = null ) {

		super( 'vec3' );

		this.node = node;
		this.scaleNode = scaleNode;

		this.normalMapType = TangentSpaceNormalMap;

	}

	setup( builder ) {

		const { normalMapType, scaleNode } = this;

		let normalMap = this.node.mul( 2.0 ).sub( 1.0 );

		if ( scaleNode !== null ) {

			normalMap = vec3( normalMap.xy.mul( scaleNode ), normalMap.z );

		}

		let outputNode = null;

		if ( normalMapType === ObjectSpaceNormalMap ) {

			outputNode = modelNormalMatrix.mul( normalMap ).normalize();

		} else if ( normalMapType === TangentSpaceNormalMap ) {

			const tangent = builder.hasGeometryAttribute( 'tangent' );

			if ( tangent === true ) {

				outputNode = TBNViewMatrix.mul( normalMap ).normalize();

			} else {

				outputNode = perturbNormal2Arb( {
					eye_pos: positionView,
					surf_norm: normalView,
					mapN: normalMap,
					uv: uv()
				} );

			}

		}

		return outputNode;

	}

}

const normalMap = nodeProxy( NormalMapNode );

addNodeElement( 'normalMap', normalMap );

addNodeClass( 'NormalMapNode', NormalMapNode );

class PosterizeNode extends TempNode {

	constructor( sourceNode, stepsNode ) {

		super();

		this.sourceNode = sourceNode;
		this.stepsNode = stepsNode;

	}

	setup() {

		const { sourceNode, stepsNode } = this;

		return sourceNode.mul( stepsNode ).floor().div( stepsNode );

	}

}

const posterize = nodeProxy( PosterizeNode );

addNodeElement( 'posterize', posterize );

addNodeClass( 'PosterizeNode', PosterizeNode );

// exposure only
const LinearToneMappingNode = tslFn( ( { color, exposure } ) => {

	return color.mul( exposure ).clamp();

} );

// source: https://www.cs.utah.edu/docs/techreports/2002/pdf/UUCS-02-001.pdf
const ReinhardToneMappingNode = tslFn( ( { color, exposure } ) => {

	color = color.mul( exposure );

	return color.div( color.add( 1.0 ) ).clamp();

} );

// source: http://filmicworlds.com/blog/filmic-tonemapping-operators/
const OptimizedCineonToneMappingNode = tslFn( ( { color, exposure } ) => {

	// optimized filmic operator by Jim Hejl and Richard Burgess-Dawson
	color = color.mul( exposure );
	color = color.sub( 0.004 ).max( 0.0 );

	const a = color.mul( color.mul( 6.2 ).add( 0.5 ) );
	const b = color.mul( color.mul( 6.2 ).add( 1.7 ) ).add( 0.06 );

	return a.div( b ).pow( 2.2 );

} );

// source: https://github.com/selfshadow/ltc_code/blob/master/webgl/shaders/ltc/ltc_blit.fs
const RRTAndODTFit = tslFn( ( { color } ) => {

	const a = color.mul( color.add( 0.0245786 ) ).sub( 0.000090537 );
	const b = color.mul( color.add( 0.4329510 ).mul( 0.983729 ) ).add( 0.238081 );

	return a.div( b );

} );

// source: https://github.com/selfshadow/ltc_code/blob/master/webgl/shaders/ltc/ltc_blit.fs
const ACESFilmicToneMappingNode = tslFn( ( { color, exposure } ) => {

	// sRGB => XYZ => D65_2_D60 => AP1 => RRT_SAT
	const ACESInputMat = mat3(
		0.59719, 0.35458, 0.04823,
		0.07600, 0.90834, 0.01566,
		0.02840, 0.13383, 0.83777
	);

	// ODT_SAT => XYZ => D60_2_D65 => sRGB
	const ACESOutputMat = mat3(
		1.60475, - 0.53108, - 0.07367,
		- 0.10208, 1.10813, - 0.00605,
		- 0.00327, - 0.07276, 1.07602
	);

	color = color.mul( exposure ).div( 0.6 );

	color = ACESInputMat.mul( color );

	// Apply RRT and ODT
	color = RRTAndODTFit( { color } );

	color = ACESOutputMat.mul( color );

	// Clamp to [0, 1]
	return color.clamp();

} );



const LINEAR_REC2020_TO_LINEAR_SRGB = mat3( vec3( 1.6605, - 0.1246, - 0.0182 ), vec3( - 0.5876, 1.1329, - 0.1006 ), vec3( - 0.0728, - 0.0083, 1.1187 ) );
const LINEAR_SRGB_TO_LINEAR_REC2020 = mat3( vec3( 0.6274, 0.0691, 0.0164 ), vec3( 0.3293, 0.9195, 0.0880 ), vec3( 0.0433, 0.0113, 0.8956 ) );

const agxDefaultContrastApprox = tslFn( ( [ x_immutable ] ) => {

	const x = vec3( x_immutable ).toVar();
	const x2 = vec3( x.mul( x ) ).toVar();
	const x4 = vec3( x2.mul( x2 ) ).toVar();

	return float( 15.5 ).mul( x4.mul( x2 ) ).sub( mul( 40.14, x4.mul( x ) ) ).add( mul( 31.96, x4 ).sub( mul( 6.868, x2.mul( x ) ) ).add( mul( 0.4298, x2 ).add( mul( 0.1191, x ).sub( 0.00232 ) ) ) );

} );

const AGXToneMappingNode = tslFn( ( { color, exposure } ) => {

	const colortone = vec3( color ).toVar();
	const AgXInsetMatrix = mat3( vec3( 0.856627153315983, 0.137318972929847, 0.11189821299995 ), vec3( 0.0951212405381588, 0.761241990602591, 0.0767994186031903 ), vec3( 0.0482516061458583, 0.101439036467562, 0.811302368396859 ) );
	const AgXOutsetMatrix = mat3( vec3( 1.1271005818144368, - 0.1413297634984383, - 0.14132976349843826 ), vec3( - 0.11060664309660323, 1.157823702216272, - 0.11060664309660294 ), vec3( - 0.016493938717834573, - 0.016493938717834257, 1.2519364065950405 ) );
	const AgxMinEv = float( - 12.47393 );
	const AgxMaxEv = float( 4.026069 );
	colortone.mulAssign( exposure );
	colortone.assign( LINEAR_SRGB_TO_LINEAR_REC2020.mul( colortone ) );
	colortone.assign( AgXInsetMatrix.mul( colortone ) );
	colortone.assign( max$1( colortone, 1e-10 ) );
	colortone.assign( log2( colortone ) );
	colortone.assign( colortone.sub( AgxMinEv ).div( AgxMaxEv.sub( AgxMinEv ) ) );
	colortone.assign( clamp( colortone, 0.0, 1.0 ) );
	colortone.assign( agxDefaultContrastApprox( colortone ) );
	colortone.assign( AgXOutsetMatrix.mul( colortone ) );
	colortone.assign( pow( max$1( vec3( 0.0 ), colortone ), vec3( 2.2 ) ) );
	colortone.assign( LINEAR_REC2020_TO_LINEAR_SRGB.mul( colortone ) );
	colortone.assign( clamp( colortone, 0.0, 1.0 ) );

	return colortone;

} );

// https://modelviewer.dev/examples/tone-mapping

const NeutralToneMappingNode = tslFn( ( { color, exposure } ) => {

	const StartCompression = float( 0.8 - 0.04 );
	const Desaturation = float( 0.15 );

	color = color.mul( exposure );

	const x = min$1( color.r, min$1( color.g, color.b ) );
	const offset = cond( x.lessThan( 0.08 ), x.sub( mul( 6.25, x.mul( x ) ) ), 0.04 );

	color.subAssign( offset );

	const peak = max$1( color.r, max$1( color.g, color.b ) );

	If( peak.lessThan( StartCompression ), () => {

		return color;

	} );

	const d = sub( 1, StartCompression );
	const newPeak = sub( 1, d.mul( d ).div( peak.add( d.sub( StartCompression ) ) ) );
	color.mulAssign( newPeak.div( peak ) );
	const g = sub( 1, div( 1, Desaturation.mul( peak.sub( newPeak ) ).add( 1 ) ) );

	return mix( color, vec3( newPeak ), g );

} ).setLayout( {
	name: 'NeutralToneMapping',
	type: 'vec3',
	inputs: [
		{ name: 'color', type: 'vec3' },
		{ name: 'exposure', type: 'float' }
	]
} );

const toneMappingLib = {
	[ LinearToneMapping ]: LinearToneMappingNode,
	[ ReinhardToneMapping ]: ReinhardToneMappingNode,
	[ CineonToneMapping ]: OptimizedCineonToneMappingNode,
	[ ACESFilmicToneMapping ]: ACESFilmicToneMappingNode,
	[ AgXToneMapping ]: AGXToneMappingNode,
	[ NeutralToneMapping ]: NeutralToneMappingNode
};

class ToneMappingNode extends TempNode {

	constructor( toneMapping = NoToneMapping, exposureNode = toneMappingExposure, colorNode = null ) {

		super( 'vec3' );

		this.toneMapping = toneMapping;

		this.exposureNode = exposureNode;
		this.colorNode = colorNode;

	}

	getCacheKey() {

		let cacheKey = super.getCacheKey();
		cacheKey = '{toneMapping:' + this.toneMapping + ',nodes:' + cacheKey + '}';

		return cacheKey;

	}

	setup( builder ) {

		const colorNode = this.colorNode || builder.context.color;
		const toneMapping = this.toneMapping;

		if ( toneMapping === NoToneMapping ) return colorNode;

		const toneMappingParams = { exposure: this.exposureNode, color: colorNode };
		const toneMappingNode = toneMappingLib[ toneMapping ];

		let outputNode = null;

		if ( toneMappingNode ) {

			outputNode = toneMappingNode( toneMappingParams );

		} else {

			console.error( 'ToneMappingNode: Unsupported Tone Mapping configuration.', toneMapping );

			outputNode = colorNode;

		}

		return outputNode;

	}

}

const toneMapping = ( mapping, exposure, color ) => nodeObject( new ToneMappingNode( mapping, nodeObject( exposure ), nodeObject( color ) ) );
const toneMappingExposure = rendererReference( 'toneMappingExposure', 'float' );

addNodeElement( 'toneMapping', ( color, mapping, exposure ) => toneMapping( mapping, exposure, color ) );

addNodeClass( 'ToneMappingNode', ToneMappingNode );

let _sharedFramebuffer = null;

class ViewportSharedTextureNode extends ViewportTextureNode {

	constructor( uvNode = viewportTopLeft, levelNode = null ) {

		if ( _sharedFramebuffer === null ) {

			_sharedFramebuffer = new FramebufferTexture();

		}

		super( uvNode, levelNode, _sharedFramebuffer );

	}

	updateReference() {

		return this;

	}

}

const viewportSharedTexture = nodeProxy( ViewportSharedTextureNode );

addNodeElement( 'viewportSharedTexture', viewportSharedTexture );

addNodeClass( 'ViewportSharedTextureNode', ViewportSharedTextureNode );

const _size$2 = new Vector2();

class PassTextureNode extends TextureNode {

	constructor( passNode, texture ) {

		super( texture );

		this.passNode = passNode;

		this.setUpdateMatrix( false );

	}

	setup( builder ) {

		this.passNode.build( builder );

		return super.setup( builder );

	}

	clone() {

		return new this.constructor( this.passNode, this.value );

	}

}

class PassNode extends TempNode {

	constructor( scope, scene, camera, options = {} ) {

		super( 'vec4' );

		this.scope = scope;
		this.scene = scene;
		this.camera = camera;
		this.options = options;

		this._pixelRatio = 1;
		this._width = 1;
		this._height = 1;

		const depthTexture = new DepthTexture();
		depthTexture.isRenderTargetTexture = true;
		//depthTexture.type = FloatType;
		depthTexture.name = 'PostProcessingDepth';

		const renderTarget = new RenderTarget( this._width * this._pixelRatio, this._height * this._pixelRatio, { type: HalfFloatType, ...options } );
		renderTarget.texture.name = 'PostProcessing';
		renderTarget.depthTexture = depthTexture;

		this.renderTarget = renderTarget;

		this.updateBeforeType = NodeUpdateType.FRAME;

		this._textureNode = nodeObject( new PassTextureNode( this, renderTarget.texture ) );
		this._depthTextureNode = nodeObject( new PassTextureNode( this, depthTexture ) );

		this._linearDepthNode = null;
		this._viewZNode = null;
		this._cameraNear = uniform( 0 );
		this._cameraFar = uniform( 0 );

		this.isPassNode = true;

	}

	isGlobal() {

		return true;

	}

	getTextureNode() {

		return this._textureNode;

	}

	getTextureDepthNode() {

		return this._depthTextureNode;

	}

	getViewZNode() {

		if ( this._viewZNode === null ) {

			const cameraNear = this._cameraNear;
			const cameraFar = this._cameraFar;

			this._viewZNode = perspectiveDepthToViewZ( this._depthTextureNode, cameraNear, cameraFar );

		}

		return this._viewZNode;

	}

	getLinearDepthNode() {

		if ( this._linearDepthNode === null ) {

			const cameraNear = this._cameraNear;
			const cameraFar = this._cameraFar;

			// TODO: just if ( builder.camera.isPerspectiveCamera )

			this._linearDepthNode = viewZToOrthographicDepth( this.getViewZNode(), cameraNear, cameraFar );

		}

		return this._linearDepthNode;

	}

	setup( { renderer } ) {

		this.renderTarget.samples = this.options.samples === undefined ? renderer.samples : this.options.samples;

		// Disable MSAA for WebGL backend for now
		if ( renderer.backend.isWebGLBackend === true ) {

			this.renderTarget.samples = 0;

		}

		this.renderTarget.depthTexture.isMultisampleRenderTargetTexture = this.renderTarget.samples > 1;

		return this.scope === PassNode.COLOR ? this.getTextureNode() : this.getLinearDepthNode();

	}

	updateBefore( frame ) {

		const { renderer } = frame;
		const { scene, camera } = this;

		this._pixelRatio = renderer.getPixelRatio();

		const size = renderer.getSize( _size$2 );

		this.setSize( size.width, size.height );

		const currentRenderTarget = renderer.getRenderTarget();

		this._cameraNear.value = camera.near;
		this._cameraFar.value = camera.far;

		renderer.setRenderTarget( this.renderTarget );

		renderer.render( scene, camera );

		renderer.setRenderTarget( currentRenderTarget );

	}

	setSize( width, height ) {

		this._width = width;
		this._height = height;

		const effectiveWidth = this._width * this._pixelRatio;
		const effectiveHeight = this._height * this._pixelRatio;

		this.renderTarget.setSize( effectiveWidth, effectiveHeight );

	}

	setPixelRatio( pixelRatio ) {

		this._pixelRatio = pixelRatio;

		this.setSize( this._width, this._height );

	}

	dispose() {

		this.renderTarget.dispose();

	}


}

PassNode.COLOR = 'color';
PassNode.DEPTH = 'depth';

const pass = ( scene, camera, options ) => nodeObject( new PassNode( PassNode.COLOR, scene, camera, options ) );
const texturePass = ( pass, texture ) => nodeObject( new PassTextureNode( pass, texture ) );
const depthPass = ( scene, camera ) => nodeObject( new PassNode( PassNode.DEPTH, scene, camera ) );

addNodeClass( 'PassNode', PassNode );

// WebGPU: The use of a single QuadMesh for both gaussian blur passes results in a single RenderObject with a SampledTexture binding that
// alternates between source textures and triggers creation of new BindGroups and BindGroupLayouts every frame.

const quadMesh1 = new QuadMesh();
const quadMesh2 = new QuadMesh();

class GaussianBlurNode extends TempNode {

	constructor( textureNode, directionNode = null, sigma = 2 ) {

		super( 'vec4' );

		this.textureNode = textureNode;
		this.directionNode = directionNode;
		this.sigma = sigma;

		this._invSize = uniform( new Vector2() );
		this._passDirection = uniform( new Vector2() );

		this._horizontalRT = new RenderTarget();
		this._horizontalRT.texture.name = 'GaussianBlurNode.horizontal';
		this._verticalRT = new RenderTarget();
		this._verticalRT.texture.name = 'GaussianBlurNode.vertical';

		this._textureNode = texturePass( this, this._verticalRT.texture );

		this.updateBeforeType = NodeUpdateType.RENDER;

		this.resolution = new Vector2( 1, 1 );

	}

	setSize( width, height ) {

		width = Math.max( Math.round( width * this.resolution.x ), 1 );
		height = Math.max( Math.round( height * this.resolution.y ), 1 );

		this._invSize.value.set( 1 / width, 1 / height );
		this._horizontalRT.setSize( width, height );
		this._verticalRT.setSize( width, height );

	}

	updateBefore( frame ) {

		const { renderer } = frame;

		const textureNode = this.textureNode;
		const map = textureNode.value;

		const currentRenderTarget = renderer.getRenderTarget();
		const currentTexture = textureNode.value;

		quadMesh1.material = this._material;
		quadMesh2.material = this._material;

		this.setSize( map.image.width, map.image.height );

		const textureType = map.type;

		this._horizontalRT.texture.type = textureType;
		this._verticalRT.texture.type = textureType;

		// horizontal

		renderer.setRenderTarget( this._horizontalRT );

		this._passDirection.value.set( 1, 0 );

		quadMesh1.render( renderer );

		// vertical

		textureNode.value = this._horizontalRT.texture;
		renderer.setRenderTarget( this._verticalRT );

		this._passDirection.value.set( 0, 1 );

		quadMesh2.render( renderer );

		// restore

		renderer.setRenderTarget( currentRenderTarget );
		textureNode.value = currentTexture;

	}

	getTextureNode() {

		return this._textureNode;

	}

	setup( builder ) {

		const textureNode = this.textureNode;

		if ( textureNode.isTextureNode !== true ) {

			console.error( 'GaussianBlurNode requires a TextureNode.' );

			return vec4();

		}

		//

		const uvNode = textureNode.uvNode || uv();
		const directionNode = vec2( this.directionNode || 1 );

		const sampleTexture = ( uv ) => textureNode.uv( uv );

		const blur = tslFn( () => {

			const kernelSize = 3 + ( 2 * this.sigma );
			const gaussianCoefficients = this._getCoefficients( kernelSize );

			const invSize = this._invSize;
			const direction = directionNode.mul( this._passDirection );

			const weightSum = float( gaussianCoefficients[ 0 ] ).toVar();
			const diffuseSum = vec4( sampleTexture( uvNode ).mul( weightSum ) ).toVar();

			for ( let i = 1; i < kernelSize; i ++ ) {

				const x = float( i );
				const w = float( gaussianCoefficients[ i ] );

				const uvOffset = vec2( direction.mul( invSize.mul( x ) ) ).toVar();

				const sample1 = vec4( sampleTexture( uvNode.add( uvOffset ) ) );
				const sample2 = vec4( sampleTexture( uvNode.sub( uvOffset ) ) );

				diffuseSum.addAssign( sample1.add( sample2 ).mul( w ) );
				weightSum.addAssign( mul( 2.0, w ) );

			}

			return diffuseSum.div( weightSum );

		} );

		//

		const material = this._material || ( this._material = builder.createNodeMaterial() );
		material.fragmentNode = blur().context( builder.getSharedContext() );
		material.needsUpdate = true;

		//

		const properties = builder.getNodeProperties( this );
		properties.textureNode = textureNode;

		//

		return this._textureNode;

	}

	_getCoefficients( kernelRadius ) {

		const coefficients = [];

		for ( let i = 0; i < kernelRadius; i ++ ) {

			coefficients.push( 0.39894 * Math.exp( - 0.5 * i * i / ( kernelRadius * kernelRadius ) ) / kernelRadius );

		}

		return coefficients;

	}

}

const gaussianBlur = ( node, directionNode, sigma ) => nodeObject( new GaussianBlurNode( nodeObject( node ).toTexture(), directionNode, sigma ) );

addNodeElement( 'gaussianBlur', gaussianBlur );

const _size$1 = new Vector2();

const quadMeshComp = new QuadMesh();

class AfterImageNode extends TempNode {

	constructor( textureNode, damp = 0.96 ) {

		super( textureNode );

		this.textureNode = textureNode;
		this.textureNodeOld = texture();
		this.damp = uniform( damp );

		this._compRT = new RenderTarget();
		this._compRT.texture.name = 'AfterImageNode.comp';

		this._oldRT = new RenderTarget();
		this._oldRT.texture.name = 'AfterImageNode.old';

		this._textureNode = texturePass( this, this._compRT.texture );

		this.updateBeforeType = NodeUpdateType.RENDER;

	}

	getTextureNode() {

		return this._textureNode;

	}

	setSize( width, height ) {

		this._compRT.setSize( width, height );
		this._oldRT.setSize( width, height );

	}

	updateBefore( frame ) {

		const { renderer } = frame;

		const textureNode = this.textureNode;
		const map = textureNode.value;

		const textureType = map.type;

		this._compRT.texture.type = textureType;
		this._oldRT.texture.type = textureType;

		renderer.getDrawingBufferSize( _size$1 );

		this.setSize( _size$1.x, _size$1.y );

		const currentRenderTarget = renderer.getRenderTarget();
		const currentTexture = textureNode.value;

		this.textureNodeOld.value = this._oldRT.texture;

		// comp
		renderer.setRenderTarget( this._compRT );
		quadMeshComp.render( renderer );

		// Swap the textures
		const temp = this._oldRT;
		this._oldRT = this._compRT;
		this._compRT = temp;

		renderer.setRenderTarget( currentRenderTarget );
		textureNode.value = currentTexture;

	}

	setup( builder ) {

		const textureNode = this.textureNode;
		const textureNodeOld = this.textureNodeOld;

		//

		const uvNode = textureNode.uvNode || uv();

		textureNodeOld.uvNode = uvNode;

		const sampleTexture = ( uv ) => textureNode.uv( uv );

		const when_gt = tslFn( ( [ x_immutable, y_immutable ] ) => {

			const y = float( y_immutable ).toVar();
			const x = vec4( x_immutable ).toVar();

			return max$1( sign( x.sub( y ) ), 0.0 );

		} );

		const afterImg = tslFn( () => {

			const texelOld = vec4( textureNodeOld );
			const texelNew = vec4( sampleTexture( uvNode ) );

			texelOld.mulAssign( this.damp.mul( when_gt( texelOld, 0.1 ) ) );
			return max$1( texelNew, texelOld );

		} );

		//

		const materialComposed = this._materialComposed || ( this._materialComposed = builder.createNodeMaterial() );
		materialComposed.fragmentNode = afterImg();

		quadMeshComp.material = materialComposed;

		//

		const properties = builder.getNodeProperties( this );
		properties.textureNode = textureNode;

		//

		return this._textureNode;

	}

}

const afterImage = ( node, damp ) => nodeObject( new AfterImageNode( nodeObject( node ).toTexture(), damp ) );

addNodeElement( 'afterImage', afterImage );

const quadMesh$1 = new QuadMesh();

class AnamorphicNode extends TempNode {

	constructor( textureNode, tresholdNode, scaleNode, samples ) {

		super( 'vec4' );

		this.textureNode = textureNode;
		this.tresholdNode = tresholdNode;
		this.scaleNode = scaleNode;
		this.colorNode = vec3( 0.1, 0.0, 1.0 );
		this.samples = samples;
		this.resolution = new Vector2( 1, 1 );

		this._renderTarget = new RenderTarget();
		this._renderTarget.texture.name = 'anamorphic';

		this._invSize = uniform( new Vector2() );

		this._textureNode = texturePass( this, this._renderTarget.texture );

		this.updateBeforeType = NodeUpdateType.RENDER;

	}

	getTextureNode() {

		return this._textureNode;

	}

	setSize( width, height ) {

		this._invSize.value.set( 1 / width, 1 / height );

		width = Math.max( Math.round( width * this.resolution.x ), 1 );
		height = Math.max( Math.round( height * this.resolution.y ), 1 );

		this._renderTarget.setSize( width, height );

	}

	updateBefore( frame ) {

		const { renderer } = frame;

		const textureNode = this.textureNode;
		const map = textureNode.value;

		this._renderTarget.texture.type = map.type;

		const currentRenderTarget = renderer.getRenderTarget();
		const currentTexture = textureNode.value;

		quadMesh$1.material = this._material;

		this.setSize( map.image.width, map.image.height );

		// render

		renderer.setRenderTarget( this._renderTarget );

		quadMesh$1.render( renderer );

		// restore

		renderer.setRenderTarget( currentRenderTarget );
		textureNode.value = currentTexture;

	}

	setup( builder ) {

		const textureNode = this.textureNode;
		const uvNode = textureNode.uvNode || uv();

		const sampleTexture = ( uv ) => textureNode.uv( uv );

		const anamorph = tslFn( () => {

			const samples = this.samples;
			const halfSamples = Math.floor( samples / 2 );

			const total = vec3( 0 ).toVar();

			loop( { start: - halfSamples, end: halfSamples }, ( { i } ) => {

				const softness = float( i ).abs().div( halfSamples ).oneMinus();

				const uv = vec2( uvNode.x.add( this._invSize.x.mul( i ).mul( this.scaleNode ) ), uvNode.y );
				const color = sampleTexture( uv );
				const pass = threshold( color, this.tresholdNode ).mul( softness );

				total.addAssign( pass );

			} );

			return total.mul( this.colorNode );

		} );

		//

		const material = this._material || ( this._material = builder.createNodeMaterial() );
		material.fragmentNode = anamorph();

		//

		const properties = builder.getNodeProperties( this );
		properties.textureNode = textureNode;

		//

		return this._textureNode;

	}

}

const anamorphic = ( node, threshold = .9, scale = 3, samples = 32 ) => nodeObject( new AnamorphicNode( nodeObject( node ).toTexture(), nodeObject( threshold ), nodeObject( scale ), samples ) );

addNodeElement( 'anamorphic', anamorphic );

class SobelOperatorNode extends TempNode {

	constructor( textureNode ) {

		super();

		this.textureNode = textureNode;

		this.updateBeforeType = NodeUpdateType.RENDER;

		this._invSize = uniform( new Vector2() );

	}

	updateBefore() {

		const map = this.textureNode.value;

		this._invSize.value.set( 1 / map.image.width, 1 / map.image.height );

	}

	setup() {

		const { textureNode } = this;

		const uvNode = textureNode.uvNode || uv();

		const sampleTexture = ( uv ) => textureNode.uv( uv );

		const sobel = tslFn( () => {

			// Sobel Edge Detection (see https://youtu.be/uihBwtPIBxM)

			const texel = this._invSize;

			// kernel definition (in glsl matrices are filled in column-major order)

			const Gx = mat3( - 1, - 2, - 1, 0, 0, 0, 1, 2, 1 ); // x direction kernel
			const Gy = mat3( - 1, 0, 1, - 2, 0, 2, - 1, 0, 1 ); // y direction kernel

			// fetch the 3x3 neighbourhood of a fragment

			// first column

			const tx0y0 = luminance( sampleTexture( uvNode.add( texel.mul( vec2( - 1, - 1 ) ) ) ).xyz );
			const tx0y1 = luminance( sampleTexture( uvNode.add( texel.mul( vec2( - 1, 0 ) ) ) ).xyz );
			const tx0y2 = luminance( sampleTexture( uvNode.add( texel.mul( vec2( - 1, 1 ) ) ) ).xyz );

			// second column

			const tx1y0 = luminance( sampleTexture( uvNode.add( texel.mul( vec2( 0, - 1 ) ) ) ).xyz );
			const tx1y1 = luminance( sampleTexture( uvNode.add( texel.mul( vec2( 0, 0 ) ) ) ).xyz );
			const tx1y2 = luminance( sampleTexture( uvNode.add( texel.mul( vec2( 0, 1 ) ) ) ).xyz );

			// third column

			const tx2y0 = luminance( sampleTexture( uvNode.add( texel.mul( vec2( 1, - 1 ) ) ) ).xyz );
			const tx2y1 = luminance( sampleTexture( uvNode.add( texel.mul( vec2( 1, 0 ) ) ) ).xyz );
			const tx2y2 = luminance( sampleTexture( uvNode.add( texel.mul( vec2( 1, 1 ) ) ) ).xyz );

			// gradient value in x direction

			const valueGx = add(
				Gx[ 0 ][ 0 ].mul( tx0y0 ),
				Gx[ 1 ][ 0 ].mul( tx1y0 ),
				Gx[ 2 ][ 0 ].mul( tx2y0 ),
				Gx[ 0 ][ 1 ].mul( tx0y1 ),
				Gx[ 1 ][ 1 ].mul( tx1y1 ),
				Gx[ 2 ][ 1 ].mul( tx2y1 ),
				Gx[ 0 ][ 2 ].mul( tx0y2 ),
				Gx[ 1 ][ 2 ].mul( tx1y2 ),
				Gx[ 2 ][ 2 ].mul( tx2y2 )
			);


			// gradient value in y direction

			const valueGy = add(
				Gy[ 0 ][ 0 ].mul( tx0y0 ),
				Gy[ 1 ][ 0 ].mul( tx1y0 ),
				Gy[ 2 ][ 0 ].mul( tx2y0 ),
				Gy[ 0 ][ 1 ].mul( tx0y1 ),
				Gy[ 1 ][ 1 ].mul( tx1y1 ),
				Gy[ 2 ][ 1 ].mul( tx2y1 ),
				Gy[ 0 ][ 2 ].mul( tx0y2 ),
				Gy[ 1 ][ 2 ].mul( tx1y2 ),
				Gy[ 2 ][ 2 ].mul( tx2y2 )
			);

			// magnitute of the total gradient

			const G = valueGx.mul( valueGx ).add( valueGy.mul( valueGy ) ).sqrt();

			return vec4( vec3( G ), 1 );

		} );

		const outputNode = sobel();

		return outputNode;

	}

}

const sobel = ( node ) => nodeObject( new SobelOperatorNode( nodeObject( node ).toTexture() ) );

addNodeElement( 'sobel', sobel );

class DepthOfFieldNode extends TempNode {

	constructor( textureNode, viewZNode, focusNode, apertureNode, maxblurNode ) {

		super();

		this.textureNode = textureNode;
		this.viewZNode = viewZNode;

		this.focusNode = focusNode;
		this.apertureNode = apertureNode;
		this.maxblurNode = maxblurNode;

		this._aspect = uniform( 0 );

		this.updateBeforeType = NodeUpdateType.RENDER;

	}

	updateBefore() {

		const map = this.textureNode.value;

		this._aspect.value = map.image.width / map.image.height;

	}

	setup() {

		const textureNode = this.textureNode;
		const uvNode = textureNode.uvNode || uv();

		const sampleTexture = ( uv ) => textureNode.uv( uv );

		const dof = tslFn( () => {

			const aspectcorrect = vec2( 1.0, this._aspect );

			const factor = this.focusNode.add( this.viewZNode );

			const dofblur = vec2( clamp( factor.mul( this.apertureNode ), this.maxblurNode.negate(), this.maxblurNode ) );

			const dofblur9 = dofblur.mul( 0.9 );
			const dofblur7 = dofblur.mul( 0.7 );
			const dofblur4 = dofblur.mul( 0.4 );

			let col = vec4( 0.0 );

			col = col.add( sampleTexture( uvNode ) );

			col = col.add( sampleTexture( uvNode.add( vec2( 0.0, 0.4 ).mul( aspectcorrect ).mul( dofblur ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( 0.15, 0.37 ).mul( aspectcorrect ).mul( dofblur ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( 0.29, 0.29 ).mul( aspectcorrect ).mul( dofblur ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( - 0.37, 0.15 ).mul( aspectcorrect ).mul( dofblur ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( 0.40, 0.0 ).mul( aspectcorrect ).mul( dofblur ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( 0.37, - 0.15 ).mul( aspectcorrect ).mul( dofblur ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( 0.29, - 0.29 ).mul( aspectcorrect ).mul( dofblur ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( - 0.15, - 0.37 ).mul( aspectcorrect ).mul( dofblur ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( 0.0, - 0.4 ).mul( aspectcorrect ).mul( dofblur ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( - 0.15, 0.37 ).mul( aspectcorrect ).mul( dofblur ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( - 0.29, 0.29 ).mul( aspectcorrect ).mul( dofblur ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( 0.37, 0.15 ).mul( aspectcorrect ).mul( dofblur ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( - 0.4, 0.0 ).mul( aspectcorrect ).mul( dofblur ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( - 0.37, - 0.15 ).mul( aspectcorrect ).mul( dofblur ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( - 0.29, - 0.29 ).mul( aspectcorrect ).mul( dofblur ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( 0.15, - 0.37 ).mul( aspectcorrect ).mul( dofblur ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( 0.15, 0.37 ).mul( aspectcorrect ).mul( dofblur9 ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( - 0.37, 0.15 ).mul( aspectcorrect ).mul( dofblur9 ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( 0.37, - 0.15 ).mul( aspectcorrect ).mul( dofblur9 ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( - 0.15, - 0.37 ).mul( aspectcorrect ).mul( dofblur9 ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( - 0.15, 0.37 ).mul( aspectcorrect ).mul( dofblur9 ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( 0.37, 0.15 ).mul( aspectcorrect ).mul( dofblur9 ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( - 0.37, - 0.15 ).mul( aspectcorrect ).mul( dofblur9 ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( 0.15, - 0.37 ).mul( aspectcorrect ).mul( dofblur9 ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( 0.29, 0.29 ).mul( aspectcorrect ).mul( dofblur7 ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( 0.40, 0.0 ).mul( aspectcorrect ).mul( dofblur7 ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( 0.29, - 0.29 ).mul( aspectcorrect ).mul( dofblur7 ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( 0.0, - 0.4 ).mul( aspectcorrect ).mul( dofblur7 ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( - 0.29, 0.29 ).mul( aspectcorrect ).mul( dofblur7 ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( - 0.4, 0.0 ).mul( aspectcorrect ).mul( dofblur7 ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( - 0.29, - 0.29 ).mul( aspectcorrect ).mul( dofblur7 ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( 0.0, 0.4 ).mul( aspectcorrect ).mul( dofblur7 ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( 0.29, 0.29 ).mul( aspectcorrect ).mul( dofblur4 ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( 0.4, 0.0 ).mul( aspectcorrect ).mul( dofblur4 ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( 0.29, - 0.29 ).mul( aspectcorrect ).mul( dofblur4 ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( 0.0, - 0.4 ).mul( aspectcorrect ).mul( dofblur4 ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( - 0.29, 0.29 ).mul( aspectcorrect ).mul( dofblur4 ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( - 0.4, 0.0 ).mul( aspectcorrect ).mul( dofblur4 ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( - 0.29, - 0.29 ).mul( aspectcorrect ).mul( dofblur4 ) ) ) );
			col = col.add( sampleTexture( uvNode.add( vec2( 0.0, 0.4 ).mul( aspectcorrect ).mul( dofblur4 ) ) ) );

			col = col.div( 41 );
			col.a = 1;

			return vec4( col );


		} );

		const outputNode = dof();

		return outputNode;

	}

}

const dof = ( node, viewZNode, focus = 1, aperture = 0.025, maxblur = 1 ) => nodeObject( new DepthOfFieldNode( nodeObject( node ).toTexture(), nodeObject( viewZNode ), nodeObject( focus ), nodeObject( aperture ), nodeObject( maxblur ) ) );

addNodeElement( 'dof', dof );

class DotScreenNode extends TempNode {

	constructor( inputNode, center = new Vector2( 0.5, 0.5 ), angle = 1.57, scale = 1 ) {

		super( 'vec4' );

		this.inputNode = inputNode;
		this.center = uniform( center );
		this.angle = uniform( angle );
		this.scale = uniform( scale );

		this._size = uniform( new Vector2() );

		this.updateBeforeType = NodeUpdateType.RENDER;

	}

	updateBefore() {

		const map = this.inputNode.value;

		this._size.value.set( map.image.width, map.image.height );

	}

	setup() {

		const inputNode = this.inputNode;

		const pattern = tslFn( () => {

			const s = sin( this.angle );
			const c = cos( this.angle );

			const tex = uv().mul( this._size ).sub( this.center );
			const point = vec2( c.mul( tex.x ).sub( s.mul( tex.y ) ), s.mul( tex.x ).add( c.mul( tex.y ) ) ).mul( this.scale );

			return sin( point.x ).mul( sin( point.y ) ).mul( 4 );

		} );

		const dotScreen = tslFn( () => {

			const color = inputNode;

			const average = add( color.r, color.g, color.b ).div( 3 );

			return vec4( vec3( average.mul( 10 ).sub( 5 ).add( pattern() ) ), color.a );

		} );

		const outputNode = dotScreen();

		return outputNode;

	}

}

const dotScreen = ( node, center, angle, scale ) => nodeObject( new DotScreenNode( nodeObject( node ), center, angle, scale ) );

addNodeElement( 'dotScreen', dotScreen );

class RGBShiftNode extends TempNode {

	constructor( textureNode, amount = 0.005, angle = 0 ) {

		super( 'vec4' );

		this.textureNode = textureNode;
		this.amount = uniform( amount );
		this.angle = uniform( angle );

	}

	setup() {

		const { textureNode } = this;

		const uvNode = textureNode.uvNode || uv();

		const sampleTexture = ( uv ) => textureNode.uv( uv );

		const rgbShift = tslFn( () => {

			const offset = vec2( cos( this.angle ), sin( this.angle ) ).mul( this.amount );
			const cr = sampleTexture( uvNode.add( offset ) );
			const cga = sampleTexture( uvNode );
			const cb = sampleTexture( uvNode.sub( offset ) );

			return vec4( cr.r, cga.g, cb.b, cga.a );

		} );

		return rgbShift();

	}

}

const rgbShift = ( node, amount, angle ) => nodeObject( new RGBShiftNode( nodeObject( node ).toTexture(), amount, angle ) );

addNodeElement( 'rgbShift', rgbShift );

class FilmNode extends TempNode {

	constructor( inputNode, intensityNode = null, uvNode = null ) {

		super();

		this.inputNode = inputNode;
		this.intensityNode = intensityNode;
		this.uvNode = uvNode;

	}

	setup() {

		const uvNode = this.uvNode || uv();

		const film = tslFn( () => {

			const base = this.inputNode.rgb;
			const noise = rand( fract( uvNode.add( timerLocal() ) ) );

			let color = base.add( base.mul( clamp( noise.add( 0.1 ), 0, 1 ) ) );

			if ( this.intensityNode !== null ) {

				color = mix( base, color, this.intensityNode );

			}

			return vec4( color, this.inputNode.a );

		} );

		const outputNode = film();

		return outputNode;

	}

}

const film = nodeProxy( FilmNode );

addNodeElement( 'film', film );

class Lut3DNode extends TempNode {

	constructor( inputNode, lutNode, size, intensityNode ) {

		super();

		this.inputNode = inputNode;
		this.lutNode = lutNode;
		this.size = uniform( size );
		this.intensityNode = intensityNode;

	}

	setup() {

		const { inputNode, lutNode } = this;

		const sampleLut = ( uv ) => lutNode.uv( uv );

		const lut3D = tslFn( () => {

			const base = inputNode;

			// pull the sample in by half a pixel so the sample begins at the center of the edge pixels.

			const pixelWidth = float( 1.0 ).div( this.size );
			const halfPixelWidth = float( 0.5 ).div( this.size );
			const uvw = vec3( halfPixelWidth ).add( base.rgb.mul( float( 1.0 ).sub( pixelWidth ) ) );

			const lutValue = vec4( sampleLut( uvw ).rgb, base.a );

			return vec4( mix( base, lutValue, this.intensityNode ) );

		} );

		const outputNode = lut3D();

		return outputNode;

	}

}

const lut3D = ( node, lut, size, intensity ) => nodeObject( new Lut3DNode( nodeObject( node ), nodeObject( lut ), size, nodeObject( intensity ) ) );

addNodeElement( 'lut3D', lut3D );

class RenderOutputNode extends TempNode {

	constructor( colorNode, toneMapping, outputColorSpace ) {

		super( 'vec4' );

		this.colorNode = colorNode;
		this.toneMapping = toneMapping;
		this.outputColorSpace = outputColorSpace;

		this.isRenderOutput = true;

	}

	setup( { context } ) {

		let outputNode = this.colorNode || context.color;

		// tone mapping

		const toneMapping = this.toneMapping !== null ? this.toneMapping : context.toneMapping;
		const outputColorSpace = this.outputColorSpace !== null ? this.outputColorSpace : context.outputColorSpace;

		if ( toneMapping !== NoToneMapping ) {

			outputNode = outputNode.toneMapping( toneMapping );

		}

		// output color space

		if ( outputColorSpace === SRGBColorSpace ) {

			outputNode = outputNode.linearToColorSpace( outputColorSpace );

		}

		return outputNode;

	}

}

const renderOutput = ( color, toneMapping = null, outputColorSpace = null ) => nodeObject( new RenderOutputNode( nodeObject( color ), toneMapping, outputColorSpace ) );

addNodeElement( 'renderOutput', renderOutput );

addNodeClass( 'RenderOutputNode', RenderOutputNode );

class FunctionCallNode extends TempNode {

	constructor( functionNode = null, parameters = {} ) {

		super();

		this.functionNode = functionNode;
		this.parameters = parameters;

	}

	setParameters( parameters ) {

		this.parameters = parameters;

		return this;

	}

	getParameters() {

		return this.parameters;

	}

	getNodeType( builder ) {

		return this.functionNode.getNodeType( builder );

	}

	generate( builder ) {

		const params = [];

		const functionNode = this.functionNode;

		const inputs = functionNode.getInputs( builder );
		const parameters = this.parameters;

		if ( Array.isArray( parameters ) ) {

			for ( let i = 0; i < parameters.length; i ++ ) {

				const inputNode = inputs[ i ];
				const node = parameters[ i ];

				params.push( node.build( builder, inputNode.type ) );

			}

		} else {

			for ( const inputNode of inputs ) {

				const node = parameters[ inputNode.name ];

				if ( node !== undefined ) {

					params.push( node.build( builder, inputNode.type ) );

				} else {

					throw new Error( `FunctionCallNode: Input '${inputNode.name}' not found in FunctionNode.` );

				}

			}

		}

		const functionName = functionNode.build( builder, 'property' );

		return `${functionName}( ${params.join( ', ' )} )`;

	}

}

const call = ( func, ...params ) => {

	params = params.length > 1 || ( params[ 0 ] && params[ 0 ].isNode === true ) ? nodeArray( params ) : nodeObjects( params[ 0 ] );

	return nodeObject( new FunctionCallNode( nodeObject( func ), params ) );

};

addNodeElement( 'call', call );

addNodeClass( 'FunctionCallNode', FunctionCallNode );

class ScriptableValueNode extends Node {

	constructor( value = null ) {

		super();

		this._value = value;
		this._cache = null;

		this.inputType = null;
		this.outpuType = null;

		this.events = new EventDispatcher();

		this.isScriptableValueNode = true;

	}

	get isScriptableOutputNode() {

		return this.outputType !== null;

	}

	set value( val ) {

		if ( this._value === val ) return;

		if ( this._cache && this.inputType === 'URL' && this.value.value instanceof ArrayBuffer ) {

			URL.revokeObjectURL( this._cache );

			this._cache = null;

		}

		this._value = val;

		this.events.dispatchEvent( { type: 'change' } );

		this.refresh();

	}

	get value() {

		return this._value;

	}

	refresh() {

		this.events.dispatchEvent( { type: 'refresh' } );

	}

	getValue() {

		const value = this.value;

		if ( value && this._cache === null && this.inputType === 'URL' && value.value instanceof ArrayBuffer ) {

			this._cache = URL.createObjectURL( new Blob( [ value.value ] ) );

		} else if ( value && value.value !== null && value.value !== undefined && (
			( ( this.inputType === 'URL' || this.inputType === 'String' ) && typeof value.value === 'string' ) ||
			( this.inputType === 'Number' && typeof value.value === 'number' ) ||
			( this.inputType === 'Vector2' && value.value.isVector2 ) ||
			( this.inputType === 'Vector3' && value.value.isVector3 ) ||
			( this.inputType === 'Vector4' && value.value.isVector4 ) ||
			( this.inputType === 'Color' && value.value.isColor ) ||
			( this.inputType === 'Matrix3' && value.value.isMatrix3 ) ||
			( this.inputType === 'Matrix4' && value.value.isMatrix4 )
		) ) {

			return value.value;

		}

		return this._cache || value;

	}

	getNodeType( builder ) {

		return this.value && this.value.isNode ? this.value.getNodeType( builder ) : 'float';

	}

	setup() {

		return this.value && this.value.isNode ? this.value : float();

	}

	serialize( data ) {

		super.serialize( data );

		if ( this.value !== null ) {

			if ( this.inputType === 'ArrayBuffer' ) {

				data.value = arrayBufferToBase64( this.value );

			} else {

				data.value = this.value ? this.value.toJSON( data.meta ).uuid : null;

			}

		} else {

			data.value = null;

		}

		data.inputType = this.inputType;
		data.outputType = this.outputType;

	}

	deserialize( data ) {

		super.deserialize( data );

		let value = null;

		if ( data.value !== null ) {

			if ( data.inputType === 'ArrayBuffer' ) {

				value = base64ToArrayBuffer( data.value );

			} else if ( data.inputType === 'Texture' ) {

				value = data.meta.textures[ data.value ];

			} else {

				value = data.meta.nodes[ data.value ] || null;

			}

		}

		this.value = value;

		this.inputType = data.inputType;
		this.outputType = data.outputType;

	}

}

const scriptableValue = nodeProxy( ScriptableValueNode );

addNodeElement( 'scriptableValue', scriptableValue );

addNodeClass( 'ScriptableValueNode', ScriptableValueNode );

class Resources extends Map {

	get( key, callback = null, ...params ) {

		if ( this.has( key ) ) return super.get( key );

		if ( callback !== null ) {

			const value = callback( ...params );
			this.set( key, value );
			return value;

		}

	}

}

class Parameters {

	constructor( scriptableNode ) {

		this.scriptableNode = scriptableNode;

	}

	get parameters() {

		return this.scriptableNode.parameters;

	}

	get layout() {

		return this.scriptableNode.getLayout();

	}

	getInputLayout( id ) {

		return this.scriptableNode.getInputLayout( id );

	}

	get( name ) {

		const param = this.parameters[ name ];
		const value = param ? param.getValue() : null;

		return value;

	}

}

const global = new Resources();

class ScriptableNode extends Node {

	constructor( codeNode = null, parameters = {} ) {

		super();

		this.codeNode = codeNode;
		this.parameters = parameters;

		this._local = new Resources();
		this._output = scriptableValue();
		this._outputs = {};
		this._source = this.source;
		this._method = null;
		this._object = null;
		this._value = null;
		this._needsOutputUpdate = true;

		this.onRefresh = this.onRefresh.bind( this );

		this.isScriptableNode = true;

	}

	get source() {

		return this.codeNode ? this.codeNode.code : '';

	}

	setLocal( name, value ) {

		return this._local.set( name, value );

	}

	getLocal( name ) {

		return this._local.get( name );

	}

	onRefresh() {

		this._refresh();

	}

	getInputLayout( id ) {

		for ( const element of this.getLayout() ) {

			if ( element.inputType && ( element.id === id || element.name === id ) ) {

				return element;

			}

		}

	}

	getOutputLayout( id ) {

		for ( const element of this.getLayout() ) {

			if ( element.outputType && ( element.id === id || element.name === id ) ) {

				return element;

			}

		}

	}

	setOutput( name, value ) {

		const outputs = this._outputs;

		if ( outputs[ name ] === undefined ) {

			outputs[ name ] = scriptableValue( value );

		} else {

			outputs[ name ].value = value;

		}

		return this;

	}

	getOutput( name ) {

		return this._outputs[ name ];

	}

	getParameter( name ) {

		return this.parameters[ name ];

	}

	setParameter( name, value ) {

		const parameters = this.parameters;

		if ( value && value.isScriptableNode ) {

			this.deleteParameter( name );

			parameters[ name ] = value;
			parameters[ name ].getDefaultOutput().events.addEventListener( 'refresh', this.onRefresh );

		} else if ( value && value.isScriptableValueNode ) {

			this.deleteParameter( name );

			parameters[ name ] = value;
			parameters[ name ].events.addEventListener( 'refresh', this.onRefresh );

		} else if ( parameters[ name ] === undefined ) {

			parameters[ name ] = scriptableValue( value );
			parameters[ name ].events.addEventListener( 'refresh', this.onRefresh );

		} else {

			parameters[ name ].value = value;

		}

		return this;

	}

	getValue() {

		return this.getDefaultOutput().getValue();

	}

	deleteParameter( name ) {

		let valueNode = this.parameters[ name ];

		if ( valueNode ) {

			if ( valueNode.isScriptableNode ) valueNode = valueNode.getDefaultOutput();

			valueNode.events.removeEventListener( 'refresh', this.onRefresh );

		}

		return this;

	}

	clearParameters() {

		for ( const name of Object.keys( this.parameters ) ) {

			this.deleteParameter( name );

		}

		this.needsUpdate = true;

		return this;

	}

	call( name, ...params ) {

		const object = this.getObject();
		const method = object[ name ];

		if ( typeof method === 'function' ) {

			return method( ...params );

		}

	}

	async callAsync( name, ...params ) {

		const object = this.getObject();
		const method = object[ name ];

		if ( typeof method === 'function' ) {

			return method.constructor.name === 'AsyncFunction' ? await method( ...params ) : method( ...params );

		}

	}

	getNodeType( builder ) {

		return this.getDefaultOutputNode().getNodeType( builder );

	}

	refresh( output = null ) {

		if ( output !== null ) {

			this.getOutput( output ).refresh();

		} else {

			this._refresh();

		}

	}

	getObject() {

		if ( this.needsUpdate ) this.dispose();
		if ( this._object !== null ) return this._object;

		//

		const refresh = () => this.refresh();
		const setOutput = ( id, value ) => this.setOutput( id, value );

		const parameters = new Parameters( this );

		const THREE = global.get( 'THREE' );
		const TSL = global.get( 'TSL' );

		const method = this.getMethod( this.codeNode );
		const params = [ parameters, this._local, global, refresh, setOutput, THREE, TSL ];

		this._object = method( ...params );

		const layout = this._object.layout;

		if ( layout ) {

			if ( layout.cache === false ) {

				this._local.clear();

			}

			// default output
			this._output.outputType = layout.outputType || null;

			if ( Array.isArray( layout.elements ) ) {

				for ( const element of layout.elements ) {

					const id = element.id || element.name;

					if ( element.inputType ) {

						if ( this.getParameter( id ) === undefined ) this.setParameter( id, null );

						this.getParameter( id ).inputType = element.inputType;

					}

					if ( element.outputType ) {

						if ( this.getOutput( id ) === undefined ) this.setOutput( id, null );

						this.getOutput( id ).outputType = element.outputType;

					}

				}

			}

		}

		return this._object;

	}

	deserialize( data ) {

		super.deserialize( data );

		for ( const name in this.parameters ) {

			let valueNode = this.parameters[ name ];

			if ( valueNode.isScriptableNode ) valueNode = valueNode.getDefaultOutput();

			valueNode.events.addEventListener( 'refresh', this.onRefresh );

		}

	}

	getLayout() {

		return this.getObject().layout;

	}

	getDefaultOutputNode() {

		const output = this.getDefaultOutput().value;

		if ( output && output.isNode ) {

			return output;

		}

		return float();

	}

	getDefaultOutput()	{

		return this._exec()._output;

	}

	getMethod() {

		if ( this.needsUpdate ) this.dispose();
		if ( this._method !== null ) return this._method;

		//

		const parametersProps = [ 'parameters', 'local', 'global', 'refresh', 'setOutput', 'THREE', 'TSL' ];
		const interfaceProps = [ 'layout', 'init', 'main', 'dispose' ];

		const properties = interfaceProps.join( ', ' );
		const declarations = 'var ' + properties + '; var output = {};\n';
		const returns = '\nreturn { ...output, ' + properties + ' };';

		const code = declarations + this.codeNode.code + returns;

		//

		this._method = new Function( ...parametersProps, code );

		return this._method;

	}

	dispose() {

		if ( this._method === null ) return;

		if ( this._object && typeof this._object.dispose === 'function' ) {

			this._object.dispose();

		}

		this._method = null;
		this._object = null;
		this._source = null;
		this._value = null;
		this._needsOutputUpdate = true;
		this._output.value = null;
		this._outputs = {};

	}

	setup() {

		return this.getDefaultOutputNode();

	}

	set needsUpdate( value ) {

		if ( value === true ) this.dispose();

	}

	get needsUpdate() {

		return this.source !== this._source;

	}

	_exec()	{

		if ( this.codeNode === null ) return this;

		if ( this._needsOutputUpdate === true ) {

			this._value = this.call( 'main' );

			this._needsOutputUpdate = false;

		}

		this._output.value = this._value;

		return this;

	}

	_refresh() {

		this.needsUpdate = true;

		this._exec();

		this._output.refresh();

	}

}

const scriptable = nodeProxy( ScriptableNode );

addNodeElement( 'scriptable', scriptable );

addNodeClass( 'ScriptableNode', ScriptableNode );

class FogNode extends Node {

	constructor( colorNode, factorNode ) {

		super( 'float' );

		this.isFogNode = true;

		this.colorNode = colorNode;
		this.factorNode = factorNode;

	}

	getViewZNode( builder ) {

		let viewZ;

		const getViewZ = builder.context.getViewZ;

		if ( getViewZ !== undefined ) {

			viewZ = getViewZ( this );

		}

		return ( viewZ || positionView.z ).negate();

	}

	setup() {

		return this.factorNode;

	}

}

const fog = nodeProxy( FogNode );

addNodeElement( 'fog', fog );

addNodeClass( 'FogNode', FogNode );

class FogRangeNode extends FogNode {

	constructor( colorNode, nearNode, farNode ) {

		super( colorNode );

		this.isFogRangeNode = true;

		this.nearNode = nearNode;
		this.farNode = farNode;

	}

	setup( builder ) {

		const viewZ = this.getViewZNode( builder );

		return smoothstep( this.nearNode, this.farNode, viewZ );

	}

}

const rangeFog = nodeProxy( FogRangeNode );

addNodeElement( 'rangeFog', rangeFog );

addNodeClass( 'FogRangeNode', FogRangeNode );

class FogExp2Node extends FogNode {

	constructor( colorNode, densityNode ) {

		super( colorNode );

		this.isFogExp2Node = true;

		this.densityNode = densityNode;

	}

	setup( builder ) {

		const viewZ = this.getViewZNode( builder );
		const density = this.densityNode;

		return density.mul( density, viewZ, viewZ ).negate().exp().oneMinus();

	}

}

const densityFog = nodeProxy( FogExp2Node );

addNodeElement( 'densityFog', densityFog );

addNodeClass( 'FogExp2Node', FogExp2Node );

let min = null;
let max = null;

class RangeNode extends Node {

	constructor( minNode = float(), maxNode = float() ) {

		super();

		this.minNode = minNode;
		this.maxNode = maxNode;

	}

	getVectorLength( builder ) {

		const minLength = builder.getTypeLength( getValueType( this.minNode.value ) );
		const maxLength = builder.getTypeLength( getValueType( this.maxNode.value ) );

		return minLength > maxLength ? minLength : maxLength;

	}

	getNodeType( builder ) {

		return builder.object.count > 1 ? builder.getTypeFromLength( this.getVectorLength( builder ) ) : 'float';

	}

	setup( builder ) {

		const object = builder.object;

		let output = null;

		if ( object.count > 1 ) {

			const minValue = this.minNode.value;
			const maxValue = this.maxNode.value;

			const minLength = builder.getTypeLength( getValueType( minValue ) );
			const maxLength = builder.getTypeLength( getValueType( maxValue ) );

			min = min || new Vector4();
			max = max || new Vector4();

			min.setScalar( 0 );
			max.setScalar( 0 );

			if ( minLength === 1 ) min.setScalar( minValue );
			else if ( minValue.isColor ) min.set( minValue.r, minValue.g, minValue.b );
			else min.set( minValue.x, minValue.y, minValue.z || 0, minValue.w || 0 );

			if ( maxLength === 1 ) max.setScalar( maxValue );
			else if ( maxValue.isColor ) max.set( maxValue.r, maxValue.g, maxValue.b );
			else max.set( maxValue.x, maxValue.y, maxValue.z || 0, maxValue.w || 0 );

			const stride = 4;

			const length = stride * object.count;
			const array = new Float32Array( length );

			for ( let i = 0; i < length; i ++ ) {

				const index = i % stride;

				const minElementValue = min.getComponent( index );
				const maxElementValue = max.getComponent( index );

				array[ i ] = MathUtils.lerp( minElementValue, maxElementValue, Math.random() );

			}

			const nodeType = this.getNodeType( builder );

			if ( object.count <= 4096 ) {

				output = buffer( array, 'vec4', object.count ).element( instanceIndex ).convert( nodeType );

			} else {

				// TODO: Improve anonymous buffer attribute creation removing this part
				const bufferAttribute = new InstancedBufferAttribute( array, 4 );
				builder.geometry.setAttribute( '__range' + this.id, bufferAttribute );

				output = instancedBufferAttribute( bufferAttribute ).convert( nodeType );

			}

		} else {

			output = float( 0 );

		}

		return output;

	}

}

const range = nodeProxy( RangeNode );

addNodeClass( 'RangeNode', RangeNode );

class ComputeNode extends Node {

	constructor( computeNode, count, workgroupSize = [ 64 ] ) {

		super( 'void' );

		this.isComputeNode = true;

		this.computeNode = computeNode;

		this.count = count;
		this.workgroupSize = workgroupSize;
		this.dispatchCount = 0;

		this.version = 1;
		this.updateBeforeType = NodeUpdateType.OBJECT;

		this.updateDispatchCount();

	}

	dispose() {

		this.dispatchEvent( { type: 'dispose' } );

	}

	set needsUpdate( value ) {

		if ( value === true ) this.version ++;

	}

	updateDispatchCount() {

		const { count, workgroupSize } = this;

		let size = workgroupSize[ 0 ];

		for ( let i = 1; i < workgroupSize.length; i ++ )
			size *= workgroupSize[ i ];

		this.dispatchCount = Math.ceil( count / size );

	}

	onInit() { }

	updateBefore( { renderer } ) {

		renderer.compute( this );

	}

	generate( builder ) {

		const { shaderStage } = builder;

		if ( shaderStage === 'compute' ) {

			const snippet = this.computeNode.build( builder, 'void' );

			if ( snippet !== '' ) {

				builder.addLineFlowCode( snippet );

			}

		}

	}

}

const compute = ( node, count, workgroupSize ) => nodeObject( new ComputeNode( nodeObject( node ), count, workgroupSize ) );

addNodeElement( 'compute', compute );

addNodeClass( 'ComputeNode', ComputeNode );

class LightNode extends Node {

	constructor( scope = LightNode.TARGET_DIRECTION, light = null ) {

		super();

		this.scope = scope;
		this.light = light;

	}

	setup() {

		const { scope, light } = this;

		let output = null;

		if ( scope === LightNode.TARGET_DIRECTION ) {

			output = cameraViewMatrix.transformDirection( objectPosition( light ).sub( objectPosition( light.target ) ) );

		}

		return output;

	}

	serialize( data ) {

		super.serialize( data );

		data.scope = this.scope;

	}

	deserialize( data ) {

		super.deserialize( data );

		this.scope = data.scope;

	}

}

LightNode.TARGET_DIRECTION = 'targetDirection';

const lightTargetDirection = nodeProxy( LightNode, LightNode.TARGET_DIRECTION );

addNodeClass( 'LightNode', LightNode );

const getDistanceAttenuation = tslFn( ( inputs ) => {

	const { lightDistance, cutoffDistance, decayExponent } = inputs;

	// based upon Frostbite 3 Moving to Physically-based Rendering
	// page 32, equation 26: E[window1]
	// https://seblagarde.files.wordpress.com/2015/07/course_notes_moving_frostbite_to_pbr_v32.pdf
	const distanceFalloff = lightDistance.pow( decayExponent ).max( 0.01 ).reciprocal();

	return cutoffDistance.greaterThan( 0 ).cond(
		distanceFalloff.mul( lightDistance.div( cutoffDistance ).pow4().oneMinus().clamp().pow2() ),
		distanceFalloff
	);

} ); // validated

class PointLightNode extends AnalyticLightNode {

	constructor( light = null ) {

		super( light );

		this.cutoffDistanceNode = uniform( 0 );
		this.decayExponentNode = uniform( 0 );

	}

	update( frame ) {

		const { light } = this;

		super.update( frame );

		this.cutoffDistanceNode.value = light.distance;
		this.decayExponentNode.value = light.decay;

	}

	setup( builder ) {

		const { colorNode, cutoffDistanceNode, decayExponentNode, light } = this;

		const lightingModel = builder.context.lightingModel;

		const lVector = objectViewPosition( light ).sub( positionView ); // @TODO: Add it into LightNode

		const lightDirection = lVector.normalize();
		const lightDistance = lVector.length();

		const lightAttenuation = getDistanceAttenuation( {
			lightDistance,
			cutoffDistance: cutoffDistanceNode,
			decayExponent: decayExponentNode
		} );

		const lightColor = colorNode.mul( lightAttenuation );

		const reflectedLight = builder.context.reflectedLight;

		lightingModel.direct( {
			lightDirection,
			lightColor,
			reflectedLight,
			shadowMask: this.shadowMaskNode
		}, builder.stack, builder );

	}

}

addNodeClass( 'PointLightNode', PointLightNode );

addLightNode( PointLight, PointLightNode );

class DirectionalLightNode extends AnalyticLightNode {

	constructor( light = null ) {

		super( light );

	}

	setup( builder ) {

		super.setup( builder );

		const lightingModel = builder.context.lightingModel;

		const lightColor = this.colorNode;
		const lightDirection = lightTargetDirection( this.light );
		const reflectedLight = builder.context.reflectedLight;

		lightingModel.direct( {
			lightDirection,
			lightColor,
			reflectedLight,
			shadowMask: this.shadowMaskNode
		}, builder.stack, builder );

	}

}

addNodeClass( 'DirectionalLightNode', DirectionalLightNode );

addLightNode( DirectionalLight, DirectionalLightNode );

const _matrix41 = new Matrix4();
const _matrix42 = new Matrix4();

let ltcLib = null;

class RectAreaLightNode extends AnalyticLightNode {

	constructor( light = null ) {

		super( light );

		this.halfHeight = uniform( new Vector3() );
		this.halfWidth = uniform( new Vector3() );

	}

	update( frame ) {

		super.update( frame );

		const { light } = this;

		const viewMatrix = frame.camera.matrixWorldInverse;

		_matrix42.identity();
		_matrix41.copy( light.matrixWorld );
		_matrix41.premultiply( viewMatrix );
		_matrix42.extractRotation( _matrix41 );

		this.halfWidth.value.set( light.width * 0.5, 0.0, 0.0 );
		this.halfHeight.value.set( 0.0, light.height * 0.5, 0.0 );

		this.halfWidth.value.applyMatrix4( _matrix42 );
		this.halfHeight.value.applyMatrix4( _matrix42 );

	}

	setup( builder ) {

		super.setup( builder );

		let ltc_1, ltc_2;

		if ( builder.isAvailable( 'float32Filterable' ) ) {

			ltc_1 = texture( ltcLib.LTC_FLOAT_1 );
			ltc_2 = texture( ltcLib.LTC_FLOAT_2 );

		} else {

			ltc_1 = texture( ltcLib.LTC_HALF_1 );
			ltc_2 = texture( ltcLib.LTC_HALF_2 );

		}

		const { colorNode, light } = this;
		const lightingModel = builder.context.lightingModel;

		const lightPosition = objectViewPosition( light );
		const reflectedLight = builder.context.reflectedLight;

		lightingModel.directRectArea( {
			lightColor: colorNode,
			lightPosition,
			halfWidth: this.halfWidth,
			halfHeight: this.halfHeight,
			reflectedLight,
			ltc_1,
			ltc_2
		}, builder.stack, builder );

	}

	static setLTC( ltc ) {

		ltcLib = ltc;

	}

}

addNodeClass( 'RectAreaLightNode', RectAreaLightNode );

addLightNode( RectAreaLight, RectAreaLightNode );

class SpotLightNode extends AnalyticLightNode {

	constructor( light = null ) {

		super( light );

		this.coneCosNode = uniform( 0 );
		this.penumbraCosNode = uniform( 0 );

		this.cutoffDistanceNode = uniform( 0 );
		this.decayExponentNode = uniform( 0 );

	}

	update( frame ) {

		super.update( frame );

		const { light } = this;

		this.coneCosNode.value = Math.cos( light.angle );
		this.penumbraCosNode.value = Math.cos( light.angle * ( 1 - light.penumbra ) );

		this.cutoffDistanceNode.value = light.distance;
		this.decayExponentNode.value = light.decay;

	}

	getSpotAttenuation( angleCosine ) {

		const { coneCosNode, penumbraCosNode } = this;

		return smoothstep( coneCosNode, penumbraCosNode, angleCosine );

	}

	setup( builder ) {

		super.setup( builder );

		const lightingModel = builder.context.lightingModel;

		const { colorNode, cutoffDistanceNode, decayExponentNode, light } = this;

		const lVector = objectViewPosition( light ).sub( positionView ); // @TODO: Add it into LightNode

		const lightDirection = lVector.normalize();
		const angleCos = lightDirection.dot( lightTargetDirection( light ) );
		const spotAttenuation = this.getSpotAttenuation( angleCos );

		const lightDistance = lVector.length();

		const lightAttenuation = getDistanceAttenuation( {
			lightDistance,
			cutoffDistance: cutoffDistanceNode,
			decayExponent: decayExponentNode
		} );

		const lightColor = colorNode.mul( spotAttenuation ).mul( lightAttenuation );

		const reflectedLight = builder.context.reflectedLight;

		lightingModel.direct( {
			lightDirection,
			lightColor,
			reflectedLight,
			shadowMask: this.shadowMaskNode
		}, builder.stack, builder );

	}

}

addNodeClass( 'SpotLightNode', SpotLightNode );

addLightNode( SpotLight, SpotLightNode );

class IESSpotLight extends SpotLight {

	constructor( color, intensity, distance, angle, penumbra, decay ) {

		super( color, intensity, distance, angle, penumbra, decay );

		this.iesMap = null;

	}

	copy( source, recursive ) {

		super.copy( source, recursive );

		this.iesMap = source.iesMap;

		return this;

	}

}

class IESSpotLightNode extends SpotLightNode {

	getSpotAttenuation( angleCosine ) {

		const iesMap = this.light.iesMap;

		let spotAttenuation = null;

		if ( iesMap && iesMap.isTexture === true ) {

			const angle = angleCosine.acos().mul( 1.0 / Math.PI );

			spotAttenuation = texture( iesMap, vec2( angle, 0 ), 0 ).r;

		} else {

			spotAttenuation = super.getSpotAttenuation( angleCosine );

		}

		return spotAttenuation;

	}

}

addNodeClass( 'IESSpotLightNode', IESSpotLightNode );

addLightNode( IESSpotLight, IESSpotLightNode );

class AmbientLightNode extends AnalyticLightNode {

	constructor( light = null ) {

		super( light );

	}

	setup( { context } ) {

		context.irradiance.addAssign( this.colorNode );

	}

}

addNodeClass( 'AmbientLightNode', AmbientLightNode );

addLightNode( AmbientLight, AmbientLightNode );

class HemisphereLightNode extends AnalyticLightNode {

	constructor( light = null ) {

		super( light );

		this.lightPositionNode = objectPosition( light );
		this.lightDirectionNode = this.lightPositionNode.normalize();

		this.groundColorNode = uniform( new Color() );

	}

	update( frame ) {

		const { light } = this;

		super.update( frame );

		this.lightPositionNode.object3d = light;

		this.groundColorNode.value.copy( light.groundColor ).multiplyScalar( light.intensity );

	}

	setup( builder ) {

		const { colorNode, groundColorNode, lightDirectionNode } = this;

		const dotNL = normalView.dot( lightDirectionNode );
		const hemiDiffuseWeight = dotNL.mul( 0.5 ).add( 0.5 );

		const irradiance = mix( groundColorNode, colorNode, hemiDiffuseWeight );

		builder.context.irradiance.addAssign( irradiance );

	}

}

addNodeClass( 'HemisphereLightNode', HemisphereLightNode );

addLightNode( HemisphereLight, HemisphereLightNode );

let _generator = null;

const _cache = new WeakMap();

function _generateCubeUVSize( imageHeight ) {

	const maxMip = Math.log2( imageHeight ) - 2;

	const texelHeight = 1.0 / imageHeight;

	const texelWidth = 1.0 / ( 3 * Math.max( Math.pow( 2, maxMip ), 7 * 16 ) );

	return { texelWidth, texelHeight, maxMip };

}

function _getPMREMFromTexture( texture ) {

	let cacheTexture = _cache.get( texture );

	const pmremVersion = cacheTexture !== undefined ? cacheTexture.pmremVersion : - 1;

	if ( pmremVersion !== texture.pmremVersion ) {

		if ( texture.isCubeTexture ) {

			if ( texture.source.data.some( ( texture ) => texture === undefined ) ) {

				throw new Error( 'PMREMNode: Undefined texture in CubeTexture. Use onLoad callback or async loader' );

			}

			cacheTexture = _generator.fromCubemap( texture, cacheTexture );

		} else {

			if ( texture.image === undefined ) {

				throw new Error( 'PMREMNode: Undefined image in Texture. Use onLoad callback or async loader' );

			}

			cacheTexture = _generator.fromEquirectangular( texture, cacheTexture );

		}

		cacheTexture.pmremVersion = texture.pmremVersion;

		_cache.set( texture, cacheTexture );

	}

	return cacheTexture.texture;

}

class PMREMNode extends TempNode {

	constructor( value, uvNode = null, levelNode = null ) {

		super( 'vec3' );

		this._value = value;
		this._pmrem = null;

		this.uvNode = uvNode;
		this.levelNode = levelNode;

		this._generator = null;
		this._texture = texture( null );
		this._width = uniform( 0 );
		this._height = uniform( 0 );
		this._maxMip = uniform( 0 );

		this.updateBeforeType = NodeUpdateType.RENDER;

	}

	set value( value ) {

		this._value = value;
		this._pmrem = null;

	}

	get value() {

		return this._value;

	}

	updateFromTexture( texture ) {

		const cubeUVSize = _generateCubeUVSize( texture.image.height );

		this._texture.value = texture;
		this._width.value = cubeUVSize.texelWidth;
		this._height.value = cubeUVSize.texelHeight;
		this._maxMip.value = cubeUVSize.maxMip;

	}

	updateBefore() {

		let pmrem = this._pmrem;

		const pmremVersion = pmrem ? pmrem.pmremVersion : - 1;
		const texture = this._value;

		if ( pmremVersion !== texture.pmremVersion ) {

			if ( texture.isPMREMTexture === true ) {

				pmrem = texture;

			} else {

				pmrem = _getPMREMFromTexture( texture );

			}

			this._pmrem = pmrem;

			this.updateFromTexture( pmrem );

		}

	}

	setup( builder ) {

		if ( _generator === null ) {

			_generator = builder.createPMREMGenerator();

		}

		//

		this.updateBefore( builder );

		//

		let uvNode = this.uvNode;

		if ( uvNode === null && builder.context.getUV ) {

			uvNode = builder.context.getUV( this );

		}

		//

		const texture = this.value;

		if ( builder.renderer.coordinateSystem === WebGLCoordinateSystem && texture.isPMREMTexture !== true && texture.isRenderTargetTexture === true ) {

			uvNode = vec3( uvNode.x.negate(), uvNode.yz );

		}

		//

		let levelNode = this.levelNode;

		if ( levelNode === null && builder.context.getTextureLevel ) {

			levelNode = builder.context.getTextureLevel( this );

		}

		//

		return textureCubeUV( this._texture, uvNode, levelNode, this._width, this._height, this._maxMip );

	}

}

const pmremTexture = nodeProxy( PMREMNode );

addNodeClass( 'PMREMNode', PMREMNode );

const envNodeCache = new WeakMap();

class EnvironmentNode extends LightingNode {

	constructor( envNode = null ) {

		super();

		this.envNode = envNode;

	}

	setup( builder ) {

		let envNode = this.envNode;

		if ( envNode.isTextureNode ) {

			let cacheEnvNode = envNodeCache.get( envNode.value );

			if ( cacheEnvNode === undefined ) {

				cacheEnvNode = pmremTexture( envNode.value );

				envNodeCache.set( envNode.value, cacheEnvNode );

			}

			envNode	= cacheEnvNode;

		}

		//

		const { material } = builder;

		const envMap = material.envMap;
		const intensity = envMap ? reference( 'envMapIntensity', 'float', builder.material ) : reference( 'environmentIntensity', 'float', builder.scene ); // @TODO: Add materialEnvIntensity in MaterialNode

		const useAnisotropy = material.useAnisotropy === true || material.anisotropy > 0;
		const radianceNormalView = useAnisotropy ? transformedBentNormalView : transformedNormalView;

		const radiance = context( envNode, createRadianceContext( roughness, radianceNormalView ) ).mul( intensity );
		const irradiance = context( envNode, createIrradianceContext( transformedNormalWorld ) ).mul( Math.PI ).mul( intensity );

		const isolateRadiance = cache( radiance );
		const isolateIrradiance = cache( irradiance );

		//

		builder.context.radiance.addAssign( isolateRadiance );

		builder.context.iblIrradiance.addAssign( isolateIrradiance );

		//

		const clearcoatRadiance = builder.context.lightingModel.clearcoatRadiance;

		if ( clearcoatRadiance ) {

			const clearcoatRadianceContext = context( envNode, createRadianceContext( clearcoatRoughness, transformedClearcoatNormalView ) ).mul( intensity );
			const isolateClearcoatRadiance = cache( clearcoatRadianceContext );

			clearcoatRadiance.addAssign( isolateClearcoatRadiance );

		}

	}

}

const createRadianceContext = ( roughnessNode, normalViewNode ) => {

	let reflectVec = null;

	return {
		getUV: () => {

			if ( reflectVec === null ) {

				reflectVec = positionViewDirection.negate().reflect( normalViewNode );

				// Mixing the reflection with the normal is more accurate and keeps rough objects from gathering light from behind their tangent plane.
				reflectVec = roughnessNode.mul( roughnessNode ).mix( reflectVec, normalViewNode ).normalize();

				reflectVec = reflectVec.transformDirection( cameraViewMatrix );

			}

			return reflectVec;

		},
		getTextureLevel: () => {

			return roughnessNode;

		}
	};

};

const createIrradianceContext = ( normalWorldNode ) => {

	return {
		getUV: () => {

			return normalWorldNode;

		},
		getTextureLevel: () => {

			return float( 1.0 );

		}
	};

};

addNodeClass( 'EnvironmentNode', EnvironmentNode );

class BasicEnvironmentNode extends LightingNode {

	constructor( envNode = null ) {

		super();

		this.envNode = envNode;

	}

	setup( builder ) {

		// environment property is used in the finish() method of BasicLightingModel

		builder.context.environment = this.envNode;

	}

}

addNodeClass( 'BasicEnvironmentNode', BasicEnvironmentNode );

const checkerShaderNode = tslFn( ( inputs ) => {

	const uv = inputs.uv.mul( 2.0 );

	const cx = uv.x.floor();
	const cy = uv.y.floor();
	const result = cx.add( cy ).mod( 2.0 );

	return result.sign();

} );

class CheckerNode extends TempNode {

	constructor( uvNode = uv() ) {

		super( 'float' );

		this.uvNode = uvNode;

	}

	setup() {

		return checkerShaderNode( { uv: this.uvNode } );

	}

}

const checker = nodeProxy( CheckerNode );

addNodeElement( 'checker', checker );

addNodeClass( 'CheckerNode', CheckerNode );

class NodeLoader extends Loader {

	constructor( manager ) {

		super( manager );

		this.textures = {};

	}

	load( url, onLoad, onProgress, onError ) {

		const loader = new FileLoader( this.manager );
		loader.setPath( this.path );
		loader.setRequestHeader( this.requestHeader );
		loader.setWithCredentials( this.withCredentials );
		loader.load( url, ( text ) => {

			try {

				onLoad( this.parse( JSON.parse( text ) ) );

			} catch ( e ) {

				if ( onError ) {

					onError( e );

				} else {

					console.error( e );

				}

				this.manager.itemError( url );

			}

		}, onProgress, onError );

	}

	parseNodes( json ) {

		const nodes = {};

		if ( json !== undefined ) {

			for ( const nodeJSON of json ) {

				const { uuid, type } = nodeJSON;

				nodes[ uuid ] = nodeObject( createNodeFromType( type ) ); // @TODO: Maybe nodeObjectify the node in createNodeFromType?
				nodes[ uuid ].uuid = uuid;

			}

			const meta = { nodes, textures: this.textures };

			for ( const nodeJSON of json ) {

				nodeJSON.meta = meta;

				const node = nodes[ nodeJSON.uuid ];
				node.deserialize( nodeJSON );

				delete nodeJSON.meta;

			}

		}

		return nodes;

	}

	parse( json ) {

		const node = nodeObject( createNodeFromType( json.type ) );
		node.uuid = json.uuid;

		const nodes = this.parseNodes( json.nodes );
		const meta = { nodes, textures: this.textures };

		json.meta = meta;

		node.deserialize( json );

		delete json.meta;

		return node;

	}

	setTextures( value ) {

		this.textures = value;
		return this;

	}

}

const defaultValues$e = new PointsMaterial();

class InstancedPointsNodeMaterial extends NodeMaterial {

	constructor( params = {} ) {

		super();

		this.normals = false;

		this.lights = false;

		this.useAlphaToCoverage = true;

		this.useColor = params.vertexColors;

		this.pointWidth = 1;

		this.pointColorNode = null;

		this.setDefaultValues( defaultValues$e );

		this.setupShaders();

		this.setValues( params );

	}

	setupShaders() {

		const useAlphaToCoverage = this.alphaToCoverage;
		const useColor = this.useColor;

		this.vertexNode = tslFn( () => {

			//vUv = uv;
			varying( vec2(), 'vUv' ).assign( uv() ); // @TODO: Analyze other way to do this

			const instancePosition = attribute( 'instancePosition' );

			// camera space
			const mvPos = property( 'vec4', 'mvPos' );
			mvPos.assign( modelViewMatrix.mul( vec4( instancePosition, 1.0 ) ) );

			const aspect = viewport.z.div( viewport.w );

			// clip space
			const clipPos = cameraProjectionMatrix.mul( mvPos );

			// offset in ndc space
			const offset = property( 'vec2', 'offset' );
			offset.assign( positionGeometry.xy );
			offset.assign( offset.mul( materialPointWidth ) );
			offset.assign( offset.div( viewport.z ) );
			offset.y.assign( offset.y.mul( aspect ) );

			// back to clip space
			offset.assign( offset.mul( clipPos.w ) );

			//clipPos.xy += offset;
			clipPos.assign( clipPos.add( vec4( offset, 0, 0 ) ) );

			return clipPos;

			//vec4 mvPosition = mvPos; // this was used for somethihng...

		} )();

		this.fragmentNode = tslFn( () => {

			const vUv = varying( vec2(), 'vUv' );

			// force assignment into correct place in flow
			const alpha = property( 'float', 'alpha' );
			alpha.assign( 1 );

			const a = vUv.x;
			const b = vUv.y;

			const len2 = a.mul( a ).add( b.mul( b ) );

			if ( useAlphaToCoverage ) {

				// force assignment out of following 'if' statement - to avoid uniform control flow errors
				const dlen = property( 'float', 'dlen' );
				dlen.assign( len2.fwidth() );

				alpha.assign( smoothstep( dlen.oneMinus(), dlen.add( 1 ), len2 ).oneMinus() );

			} else {

				len2.greaterThan( 1.0 ).discard();

			}

			let pointColorNode;

			if ( this.pointColorNode ) {

				pointColorNode = this.pointColorNode;

			} else {

				if ( useColor ) {

					const instanceColor = attribute( 'instanceColor' );

					pointColorNode = instanceColor.mul( materialColor );

				} else {

					pointColorNode = materialColor;

				}

			}

			return vec4( pointColorNode, alpha );

		} )();

		this.needsUpdate = true;

	}

	get alphaToCoverage() {

		return this.useAlphaToCoverage;

	}

	set alphaToCoverage( value ) {

		if ( this.useAlphaToCoverage !== value ) {

			this.useAlphaToCoverage = value;
			this.setupShaders();

		}

	}

}

addNodeMaterial( 'InstancedPointsNodeMaterial', InstancedPointsNodeMaterial );

const defaultValues$d = new LineBasicMaterial();

class LineBasicNodeMaterial extends NodeMaterial {

	constructor( parameters ) {

		super();

		this.isLineBasicNodeMaterial = true;

		this.lights = false;
		this.normals = false;

		this.setDefaultValues( defaultValues$d );

		this.setValues( parameters );

	}

}

addNodeMaterial( 'LineBasicNodeMaterial', LineBasicNodeMaterial );

const defaultValues$c = new LineDashedMaterial();

class LineDashedNodeMaterial extends NodeMaterial {

	constructor( parameters ) {

		super();

		this.isLineDashedNodeMaterial = true;

		this.lights = false;
		this.normals = false;

		this.setDefaultValues( defaultValues$c );

		this.offsetNode = null;
		this.dashScaleNode = null;
		this.dashSizeNode = null;
		this.gapSizeNode = null;

		this.setValues( parameters );

	}

	setupVariants() {

		const offsetNode = this.offsetNode;
		const dashScaleNode = this.dashScaleNode ? float( this.dashScaleNode ) : materialLineScale;
		const dashSizeNode = this.dashSizeNode ? float( this.dashSizeNode ) : materialLineDashSize;
		const gapSizeNode = this.dashSizeNode ? float( this.dashGapNode ) : materialLineGapSize;

		dashSize.assign( dashSizeNode );
		gapSize.assign( gapSizeNode );

		const vLineDistance = varying( attribute( 'lineDistance' ).mul( dashScaleNode ) );
		const vLineDistanceOffset = offsetNode ? vLineDistance.add( offsetNode ) : vLineDistance;

		vLineDistanceOffset.mod( dashSize.add( gapSize ) ).greaterThan( dashSize ).discard();

	}

}

addNodeMaterial( 'LineDashedNodeMaterial', LineDashedNodeMaterial );

const defaultValues$b = new LineDashedMaterial();

class Line2NodeMaterial extends NodeMaterial {

	constructor( params = {} ) {

		super();

		this.normals = false;
		this.lights = false;

		this.setDefaultValues( defaultValues$b );

		this.useAlphaToCoverage = true;
		this.useColor = params.vertexColors;
		this.useDash = params.dashed;
		this.useWorldUnits = false;

		this.dashOffset = 0;
		this.lineWidth = 1;

		this.lineColorNode = null;

		this.offsetNode = null;
		this.dashScaleNode = null;
		this.dashSizeNode = null;
		this.gapSizeNode = null;

		this.setValues( params );

	}

	setup( builder ) {

		this.setupShaders();

		super.setup( builder );

	}

	setupShaders() {

		const useAlphaToCoverage = this.alphaToCoverage;
		const useColor = this.useColor;
		const useDash = this.dashed;
		const useWorldUnits = this.worldUnits;

		const trimSegment = tslFn( ( { start, end } ) => {

			const a = cameraProjectionMatrix.element( 2 ).element( 2 ); // 3nd entry in 3th column
			const b = cameraProjectionMatrix.element( 3 ).element( 2 ); // 3nd entry in 4th column
			const nearEstimate = b.mul( - 0.5 ).div( a );

			const alpha = nearEstimate.sub( start.z ).div( end.z.sub( start.z ) );

			return vec4( mix( start.xyz, end.xyz, alpha ), end.w );

		} );

		this.vertexNode = tslFn( () => {

			varyingProperty( 'vec2', 'vUv' ).assign( uv() );

			const instanceStart = attribute( 'instanceStart' );
			const instanceEnd = attribute( 'instanceEnd' );

			// camera space

			const start = property( 'vec4', 'start' );
			const end = property( 'vec4', 'end' );

			start.assign( modelViewMatrix.mul( vec4( instanceStart, 1.0 ) ) ); // force assignment into correct place in flow
			end.assign( modelViewMatrix.mul( vec4( instanceEnd, 1.0 ) ) );

			if ( useWorldUnits ) {

				varyingProperty( 'vec3', 'worldStart' ).assign( start.xyz );
				varyingProperty( 'vec3', 'worldEnd' ).assign( end.xyz );

			}

			const aspect = viewport.z.div( viewport.w );

			// special case for perspective projection, and segments that terminate either in, or behind, the camera plane
			// clearly the gpu firmware has a way of addressing this issue when projecting into ndc space
			// but we need to perform ndc-space calculations in the shader, so we must address this issue directly
			// perhaps there is a more elegant solution -- WestLangley

			const perspective = cameraProjectionMatrix.element( 2 ).element( 3 ).equal( - 1.0 ); // 4th entry in the 3rd column

			If( perspective, () => {

				If( start.z.lessThan( 0.0 ).and( end.z.greaterThan( 0.0 ) ), () => {

					end.assign( trimSegment( { start: start, end: end } ) );

				} ).elseif( end.z.lessThan( 0.0 ).and( start.z.greaterThanEqual( 0.0 ) ), () => {

					start.assign( trimSegment( { start: end, end: start } ) );

			 	} );

			} );

			// clip space
			const clipStart = cameraProjectionMatrix.mul( start );
			const clipEnd = cameraProjectionMatrix.mul( end );

			// ndc space
			const ndcStart = clipStart.xyz.div( clipStart.w );
			const ndcEnd = clipEnd.xyz.div( clipEnd.w );

			// direction
			const dir = ndcEnd.xy.sub( ndcStart.xy ).temp();

			// account for clip-space aspect ratio
			dir.x.assign( dir.x.mul( aspect ) );
			dir.assign( dir.normalize() );

			const clip = temp( vec4() );

			if ( useWorldUnits ) {

				// get the offset direction as perpendicular to the view vector

				const worldDir = end.xyz.sub( start.xyz ).normalize();
				const tmpFwd = mix( start.xyz, end.xyz, 0.5 ).normalize();
				const worldUp = worldDir.cross( tmpFwd ).normalize();
				const worldFwd = worldDir.cross( worldUp );

				const worldPos = varyingProperty( 'vec4', 'worldPos' );

				worldPos.assign( positionGeometry.y.lessThan( 0.5 ).cond( start, end ) );

				// height offset
				const hw = materialLineWidth.mul( 0.5 );
				worldPos.addAssign( vec4( positionGeometry.x.lessThan( 0.0 ).cond( worldUp.mul( hw ), worldUp.mul( hw ).negate() ), 0 ) );

				// don't extend the line if we're rendering dashes because we
				// won't be rendering the endcaps
				if ( ! useDash ) {

					// cap extension
					worldPos.addAssign( vec4( positionGeometry.y.lessThan( 0.5 ).cond( worldDir.mul( hw ).negate(), worldDir.mul( hw ) ), 0 ) );

					// add width to the box
					worldPos.addAssign( vec4( worldFwd.mul( hw ), 0 ) );

					// endcaps
					If( positionGeometry.y.greaterThan( 1.0 ).or( positionGeometry.y.lessThan( 0.0 ) ), () => {

						worldPos.subAssign( vec4( worldFwd.mul( 2.0 ).mul( hw ), 0 ) );

					} );

				}

				// project the worldpos
				clip.assign( cameraProjectionMatrix.mul( worldPos ) );

				// shift the depth of the projected points so the line
				// segments overlap neatly
				const clipPose = temp( vec3() );

				clipPose.assign( positionGeometry.y.lessThan( 0.5 ).cond( ndcStart, ndcEnd ) );
				clip.z.assign( clipPose.z.mul( clip.w ) );

			} else {

				const offset = property( 'vec2', 'offset' );

				offset.assign( vec2( dir.y, dir.x.negate() ) );

				// undo aspect ratio adjustment
				dir.x.assign( dir.x.div( aspect ) );
				offset.x.assign( offset.x.div( aspect ) );

				// sign flip
				offset.assign( positionGeometry.x.lessThan( 0.0 ).cond( offset.negate(), offset ) );

				// endcaps
				If( positionGeometry.y.lessThan( 0.0 ), () => {

					offset.assign( offset.sub( dir ) );

				} ).elseif( positionGeometry.y.greaterThan( 1.0 ), () => {

					offset.assign( offset.add( dir ) );

				} );

				// adjust for linewidth
				offset.assign( offset.mul( materialLineWidth ) );

				// adjust for clip-space to screen-space conversion // maybe resolution should be based on viewport ...
				offset.assign( offset.div( viewport.w ) );

				// select end
				clip.assign( positionGeometry.y.lessThan( 0.5 ).cond( clipStart, clipEnd ) );

				// back to clip space
				offset.assign( offset.mul( clip.w ) );

				clip.assign( clip.add( vec4( offset, 0, 0 ) ) );

			}

			return clip;

		} )();

		const closestLineToLine = tslFn( ( { p1, p2, p3, p4 } ) => {

			const p13 = p1.sub( p3 );
			const p43 = p4.sub( p3 );

			const p21 = p2.sub( p1 );

			const d1343 = p13.dot( p43 );
			const d4321 = p43.dot( p21 );
			const d1321 = p13.dot( p21 );
			const d4343 = p43.dot( p43 );
			const d2121 = p21.dot( p21 );

			const denom = d2121.mul( d4343 ).sub( d4321.mul( d4321 ) );
			const numer = d1343.mul( d4321 ).sub( d1321.mul( d4343 ) );

			const mua = numer.div( denom ).clamp();
			const mub = d1343.add( d4321.mul( mua ) ).div( d4343 ).clamp();

			return vec2( mua, mub );

		} );

		this.fragmentNode = tslFn( () => {

			const vUv = varyingProperty( 'vec2', 'vUv' );

			if ( useDash ) {

				const offsetNode = this.offsetNode ? float( this.offsetNodeNode ) : materialLineDashOffset;
				const dashScaleNode = this.dashScaleNode ? float( this.dashScaleNode ) : materialLineScale;
				const dashSizeNode = this.dashSizeNode ? float( this.dashSizeNode ) : materialLineDashSize;
				const gapSizeNode = this.dashSizeNode ? float( this.dashGapNode ) : materialLineGapSize;

				dashSize.assign( dashSizeNode );
				gapSize.assign( gapSizeNode );

				const instanceDistanceStart = attribute( 'instanceDistanceStart' );
				const instanceDistanceEnd = attribute( 'instanceDistanceEnd' );

				const lineDistance = positionGeometry.y.lessThan( 0.5 ).cond( dashScaleNode.mul( instanceDistanceStart ), materialLineScale.mul( instanceDistanceEnd ) );

				const vLineDistance = varying( lineDistance.add( materialLineDashOffset ) );
				const vLineDistanceOffset = offsetNode ? vLineDistance.add( offsetNode ) : vLineDistance;

				vUv.y.lessThan( - 1.0 ).or( vUv.y.greaterThan( 1.0 ) ).discard(); // discard endcaps
				vLineDistanceOffset.mod( dashSize.add( gapSize ) ).greaterThan( dashSize ).discard(); // todo - FIX

			}

			 // force assignment into correct place in flow
			const alpha = property( 'float', 'alpha' );
			alpha.assign( 1 );

			if ( useWorldUnits ) {

				const worldStart = varyingProperty( 'vec3', 'worldStart' );
				const worldEnd = varyingProperty( 'vec3', 'worldEnd' );

				// Find the closest points on the view ray and the line segment
				const rayEnd = varyingProperty( 'vec4', 'worldPos' ).xyz.normalize().mul( 1e5 );
				const lineDir = worldEnd.sub( worldStart );
				const params = closestLineToLine( { p1: worldStart, p2: worldEnd, p3: vec3( 0.0, 0.0, 0.0 ), p4: rayEnd } );

				const p1 = worldStart.add( lineDir.mul( params.x ) );
				const p2 = rayEnd.mul( params.y );
				const delta = p1.sub( p2 );
				const len = delta.length();
				const norm = len.div( materialLineWidth );

				if ( ! useDash ) {

					if ( useAlphaToCoverage ) {

						const dnorm = norm.fwidth();
						alpha.assign( smoothstep( dnorm.negate().add( 0.5 ), dnorm.add( 0.5 ), norm ).oneMinus() );

					} else {

						norm.greaterThan( 0.5 ).discard();

					}

				}

			} else {

				// round endcaps

				if ( useAlphaToCoverage ) {

					const a = vUv.x;
					const b = vUv.y.greaterThan( 0.0 ).cond( vUv.y.sub( 1.0 ), vUv.y.add( 1.0 ) );

					const len2 = a.mul( a ).add( b.mul( b ) );

					// force assignment out of following 'if' statement - to avoid uniform control flow errors
					const dlen = property( 'float', 'dlen' );
					dlen.assign( len2.fwidth() );

					If( vUv.y.abs().greaterThan( 1.0 ), () => {

						alpha.assign( smoothstep( dlen.oneMinus(), dlen.add( 1 ), len2 ).oneMinus() );

					} );

				} else {

					If( vUv.y.abs().greaterThan( 1.0 ), () => {

						const a = vUv.x;
						const b = vUv.y.greaterThan( 0.0 ).cond( vUv.y.sub( 1.0 ), vUv.y.add( 1.0 ) );
						const len2 = a.mul( a ).add( b.mul( b ) );

						len2.greaterThan( 1.0 ).discard();

					} );

				}

			}

			let lineColorNode;

			if ( this.lineColorNode ) {

				lineColorNode = this.lineColorNode;

			} else {

				if ( useColor ) {

					const instanceColorStart = attribute( 'instanceColorStart' );
					const instanceColorEnd = attribute( 'instanceColorEnd' );

					const instanceColor = positionGeometry.y.lessThan( 0.5 ).cond( instanceColorStart, instanceColorEnd );

					lineColorNode = instanceColor.mul( materialColor );

				} else {

					lineColorNode = materialColor;

				}

			}

			return vec4( lineColorNode, alpha );

		} )();

	}


	get worldUnits() {

		return this.useWorldUnits;

	}

	set worldUnits( value ) {

		if ( this.useWorldUnits !== value ) {

			this.useWorldUnits = value;
			this.needsUpdate = true;

		}

	}


	get dashed() {

		return this.useDash;

	}

	set dashed( value ) {

		if ( this.useDash !== value ) {

			this.useDash = value;
			this.needsUpdate = true;

		}

	}


	get alphaToCoverage() {

		return this.useAlphaToCoverage;

	}

	set alphaToCoverage( value ) {

		if ( this.useAlphaToCoverage !== value ) {

			this.useAlphaToCoverage = value;
			this.needsUpdate = true;

		}

	}

}

addNodeMaterial( 'Line2NodeMaterial', Line2NodeMaterial );

const defaultValues$a = new MeshNormalMaterial();

class MeshNormalNodeMaterial extends NodeMaterial {

	constructor( parameters ) {

		super();

		this.lights = false;

		this.isMeshNormalNodeMaterial = true;

		this.setDefaultValues( defaultValues$a );

		this.setValues( parameters );

	}

	setupDiffuseColor() {

		const opacityNode = this.opacityNode ? float( this.opacityNode ) : materialOpacity;

		diffuseColor.assign( vec4( directionToColor( transformedNormalView ), opacityNode ) );

	}

}

addNodeMaterial( 'MeshNormalNodeMaterial', MeshNormalNodeMaterial );

class BasicLightingModel extends LightingModel {

	constructor() {

		super();

	}

	indirectDiffuse( { reflectedLight } ) {

		reflectedLight.indirectDiffuse.assign( diffuseColor.rgb );

	}

	finish( context, stack, builder ) {

		const material = builder.material;
		const outgoingLight = context.outgoingLight;
		const envNode = builder.context.environment;

		if ( envNode ) {

			switch ( material.combine ) {

				case MultiplyOperation:
					outgoingLight.rgb.assign( mix( outgoingLight.rgb, outgoingLight.rgb.mul( envNode.rgb ), materialSpecularStrength.mul( materialReflectivity ) ) );
					break;

				case MixOperation:
					outgoingLight.rgb.assign( mix( outgoingLight.rgb, envNode.rgb, materialSpecularStrength.mul( materialReflectivity ) ) );
					break;

				case AddOperation:
					outgoingLight.rgb.addAssign( envNode.rgb.mul( materialSpecularStrength.mul( materialReflectivity ) ) );
					break;

				default:
					console.warn( 'THREE.BasicLightingModel: Unsupported .combine value:', material.combine );
					break;

			}

		}

	}

}

const defaultValues$9 = new MeshBasicMaterial();

class MeshBasicNodeMaterial extends NodeMaterial {

	constructor( parameters ) {

		super();

		this.isMeshBasicNodeMaterial = true;

		this.lights = true;
		//this.normals = false; @TODO: normals usage by context

		this.setDefaultValues( defaultValues$9 );

		this.setValues( parameters );

	}

	setupEnvironment( builder ) {

		const envNode = super.setupEnvironment( builder );

		return envNode ? new BasicEnvironmentNode( envNode ) : null;

	}

	setupLightingModel() {

		return new BasicLightingModel();

	}

}

addNodeMaterial( 'MeshBasicNodeMaterial', MeshBasicNodeMaterial );

const F_Schlick = tslFn( ( { f0, f90, dotVH } ) => {

	// Original approximation by Christophe Schlick '94
	// float fresnel = pow( 1.0 - dotVH, 5.0 );

	// Optimized variant (presented by Epic at SIGGRAPH '13)
	// https://cdn2.unrealengine.com/Resources/files/2013SiggraphPresentationsNotes-26915738.pdf
	const fresnel = dotVH.mul( - 5.55473 ).sub( 6.98316 ).mul( dotVH ).exp2();

	return f0.mul( fresnel.oneMinus() ).add( f90.mul( fresnel ) );

} ); // validated

const BRDF_Lambert = tslFn( ( inputs ) => {

	return inputs.diffuseColor.mul( 1 / Math.PI ); // punctual light

} ); // validated

const G_BlinnPhong_Implicit = () => float( 0.25 );

const D_BlinnPhong = tslFn( ( { dotNH } ) => {

	return shininess.mul( float( 0.5 ) ).add( 1.0 ).mul( float( 1 / Math.PI ) ).mul( dotNH.pow( shininess ) );

} );

const BRDF_BlinnPhong = tslFn( ( { lightDirection } ) => {

	const halfDir = lightDirection.add( positionViewDirection ).normalize();

	const dotNH = transformedNormalView.dot( halfDir ).clamp();
	const dotVH = positionViewDirection.dot( halfDir ).clamp();

	const F = F_Schlick( { f0: specularColor, f90: 1.0, dotVH } );
	const G = G_BlinnPhong_Implicit();
	const D = D_BlinnPhong( { dotNH } );

	return F.mul( G ).mul( D );

} );

class PhongLightingModel extends BasicLightingModel {

	constructor( specular = true ) {

		super();

		this.specular = specular;

	}

	direct( { lightDirection, lightColor, reflectedLight } ) {

		const dotNL = transformedNormalView.dot( lightDirection ).clamp();
		const irradiance = dotNL.mul( lightColor );

		reflectedLight.directDiffuse.addAssign( irradiance.mul( BRDF_Lambert( { diffuseColor: diffuseColor.rgb } ) ) );

		if ( this.specular === true ) {

			reflectedLight.directSpecular.addAssign( irradiance.mul( BRDF_BlinnPhong( { lightDirection } ) ).mul( materialSpecularStrength ) );

		}

	}

	indirectDiffuse( { irradiance, reflectedLight } ) {

		reflectedLight.indirectDiffuse.addAssign( irradiance.mul( BRDF_Lambert( { diffuseColor } ) ) );

	}

}

const defaultValues$8 = new MeshLambertMaterial();

class MeshLambertNodeMaterial extends NodeMaterial {

	constructor( parameters ) {

		super();

		this.isMeshLambertNodeMaterial = true;

		this.lights = true;

		this.setDefaultValues( defaultValues$8 );

		this.setValues( parameters );

	}

	setupLightingModel( /*builder*/ ) {

		return new PhongLightingModel( false ); // ( specular ) -> force lambert

	}

}

addNodeMaterial( 'MeshLambertNodeMaterial', MeshLambertNodeMaterial );

const defaultValues$7 = new MeshPhongMaterial();

class MeshPhongNodeMaterial extends NodeMaterial {

	constructor( parameters ) {

		super();

		this.isMeshPhongNodeMaterial = true;

		this.lights = true;

		this.shininessNode = null;
		this.specularNode = null;

		this.setDefaultValues( defaultValues$7 );

		this.setValues( parameters );

	}

	setupLightingModel( /*builder*/ ) {

		return new PhongLightingModel();

	}

	setupVariants() {

		// SHININESS

		const shininessNode = ( this.shininessNode ? float( this.shininessNode ) : materialShininess ).max( 1e-4 ); // to prevent pow( 0.0, 0.0 )

		shininess.assign( shininessNode );

		// SPECULAR COLOR

		const specularNode = this.specularNode || materialSpecular;

		specularColor.assign( specularNode );

	}

	copy( source ) {

		this.shininessNode = source.shininessNode;
		this.specularNode = source.specularNode;

		return super.copy( source );

	}

}

addNodeMaterial( 'MeshPhongNodeMaterial', MeshPhongNodeMaterial );

const getGeometryRoughness = tslFn( () => {

	const dxy = normalGeometry.dFdx().abs().max( normalGeometry.dFdy().abs() );
	const geometryRoughness = dxy.x.max( dxy.y ).max( dxy.z );

	return geometryRoughness;

} );

const getRoughness = tslFn( ( inputs ) => {

	const { roughness } = inputs;

	const geometryRoughness = getGeometryRoughness();

	let roughnessFactor = roughness.max( 0.0525 ); // 0.0525 corresponds to the base mip of a 256 cubemap.
	roughnessFactor = roughnessFactor.add( geometryRoughness );
	roughnessFactor = roughnessFactor.min( 1.0 );

	return roughnessFactor;

} );

// Moving Frostbite to Physically Based Rendering 3.0 - page 12, listing 2
// https://seblagarde.files.wordpress.com/2015/07/course_notes_moving_frostbite_to_pbr_v32.pdf
const V_GGX_SmithCorrelated = tslFn( ( { alpha, dotNL, dotNV } ) => {

	const a2 = alpha.pow2();

	const gv = dotNL.mul( a2.add( a2.oneMinus().mul( dotNV.pow2() ) ).sqrt() );
	const gl = dotNV.mul( a2.add( a2.oneMinus().mul( dotNL.pow2() ) ).sqrt() );

	return div( 0.5, gv.add( gl ).max( EPSILON ) );

} ).setLayout( {
	name: 'V_GGX_SmithCorrelated',
	type: 'float',
	inputs: [
		{ name: 'alpha', type: 'float' },
		{ name: 'dotNL', type: 'float' },
		{ name: 'dotNV', type: 'float' }
	]
} ); // validated

// https://google.github.io/filament/Filament.md.html#materialsystem/anisotropicmodel/anisotropicspecularbrdf

const V_GGX_SmithCorrelated_Anisotropic = tslFn( ( { alphaT, alphaB, dotTV, dotBV, dotTL, dotBL, dotNV, dotNL } ) => {

	const gv = dotNL.mul( vec3( alphaT.mul( dotTV ), alphaB.mul( dotBV ), dotNV ).length() );
	const gl = dotNV.mul( vec3( alphaT.mul( dotTL ), alphaB.mul( dotBL ), dotNL ).length() );
	const v = div( 0.5, gv.add( gl ) );

	return v.saturate();

} ).setLayout( {
	name: 'V_GGX_SmithCorrelated_Anisotropic',
	type: 'float',
	inputs: [
		{ name: 'alphaT', type: 'float', qualifier: 'in' },
		{ name: 'alphaB', type: 'float', qualifier: 'in' },
		{ name: 'dotTV', type: 'float', qualifier: 'in' },
		{ name: 'dotBV', type: 'float', qualifier: 'in' },
		{ name: 'dotTL', type: 'float', qualifier: 'in' },
		{ name: 'dotBL', type: 'float', qualifier: 'in' },
		{ name: 'dotNV', type: 'float', qualifier: 'in' },
		{ name: 'dotNL', type: 'float', qualifier: 'in' }
	]
} );

// Microfacet Models for Refraction through Rough Surfaces - equation (33)
// http://graphicrants.blogspot.com/2013/08/specular-brdf-reference.html
// alpha is "roughness squared" in Disney’s reparameterization
const D_GGX = tslFn( ( { alpha, dotNH } ) => {

	const a2 = alpha.pow2();

	const denom = dotNH.pow2().mul( a2.oneMinus() ).oneMinus(); // avoid alpha = 0 with dotNH = 1

	return a2.div( denom.pow2() ).mul( 1 / Math.PI );

} ).setLayout( {
	name: 'D_GGX',
	type: 'float',
	inputs: [
		{ name: 'alpha', type: 'float' },
		{ name: 'dotNH', type: 'float' }
	]
} ); // validated

const RECIPROCAL_PI = float( 1 / Math.PI );

// https://google.github.io/filament/Filament.md.html#materialsystem/anisotropicmodel/anisotropicspecularbrdf

const D_GGX_Anisotropic = tslFn( ( { alphaT, alphaB, dotNH, dotTH, dotBH } ) => {

	const a2 = alphaT.mul( alphaB );
	const v = vec3( alphaB.mul( dotTH ), alphaT.mul( dotBH ), a2.mul( dotNH ) );
	const v2 = v.dot( v );
	const w2 = a2.div( v2 );

	return RECIPROCAL_PI.mul( a2.mul( w2.pow2() ) );

} ).setLayout( {
	name: 'D_GGX_Anisotropic',
	type: 'float',
	inputs: [
		{ name: 'alphaT', type: 'float', qualifier: 'in' },
		{ name: 'alphaB', type: 'float', qualifier: 'in' },
		{ name: 'dotNH', type: 'float', qualifier: 'in' },
		{ name: 'dotTH', type: 'float', qualifier: 'in' },
		{ name: 'dotBH', type: 'float', qualifier: 'in' }
	]
} );

// GGX Distribution, Schlick Fresnel, GGX_SmithCorrelated Visibility
const BRDF_GGX = tslFn( ( inputs ) => {

	const { lightDirection, f0, f90, roughness, f, USE_IRIDESCENCE, USE_ANISOTROPY } = inputs;

	const normalView = inputs.normalView || transformedNormalView;

	const alpha = roughness.pow2(); // UE4's roughness

	const halfDir = lightDirection.add( positionViewDirection ).normalize();

	const dotNL = normalView.dot( lightDirection ).clamp();
	const dotNV = normalView.dot( positionViewDirection ).clamp(); // @ TODO: Move to core dotNV
	const dotNH = normalView.dot( halfDir ).clamp();
	const dotVH = positionViewDirection.dot( halfDir ).clamp();

	let F = F_Schlick( { f0, f90, dotVH } );
	let V, D;

	if ( defined( USE_IRIDESCENCE ) ) {

		F = iridescence.mix( F, f );

	}

	if ( defined( USE_ANISOTROPY ) ) {

		const dotTL = anisotropyT.dot( lightDirection );
		const dotTV = anisotropyT.dot( positionViewDirection );
		const dotTH = anisotropyT.dot( halfDir );
		const dotBL = anisotropyB.dot( lightDirection );
		const dotBV = anisotropyB.dot( positionViewDirection );
		const dotBH = anisotropyB.dot( halfDir );

		V = V_GGX_SmithCorrelated_Anisotropic( { alphaT, alphaB: alpha, dotTV, dotBV, dotTL, dotBL, dotNV, dotNL } );
		D = D_GGX_Anisotropic( { alphaT, alphaB: alpha, dotNH, dotTH, dotBH } );

	} else {

		V = V_GGX_SmithCorrelated( { alpha, dotNL, dotNV } );
		D = D_GGX( { alpha, dotNH } );

	}

	return F.mul( V ).mul( D );

} ); // validated

// Analytical approximation of the DFG LUT, one half of the
// split-sum approximation used in indirect specular lighting.
// via 'environmentBRDF' from "Physically Based Shading on Mobile"
// https://www.unrealengine.com/blog/physically-based-shading-on-mobile
const DFGApprox = tslFn( ( { roughness, dotNV } ) => {

	const c0 = vec4( - 1, - 0.0275, - 0.572, 0.022 );

	const c1 = vec4( 1, 0.0425, 1.04, - 0.04 );

	const r = roughness.mul( c0 ).add( c1 );

	const a004 = r.x.mul( r.x ).min( dotNV.mul( - 9.28 ).exp2() ).mul( r.x ).add( r.y );

	const fab = vec2( - 1.04, 1.04 ).mul( a004 ).add( r.zw );

	return fab;

} ).setLayout( {
	name: 'DFGApprox',
	type: 'vec2',
	inputs: [
		{ name: 'roughness', type: 'float' },
		{ name: 'dotNV', type: 'vec3' }
	]
} );

const EnvironmentBRDF = tslFn( ( inputs ) => {

	const { dotNV, specularColor, specularF90, roughness } = inputs;

	const fab = DFGApprox( { dotNV, roughness } );
	return specularColor.mul( fab.x ).add( specularF90.mul( fab.y ) );

} );

const Schlick_to_F0 = tslFn( ( { f, f90, dotVH } ) => {

	const x = dotVH.oneMinus().saturate();
	const x2 = x.mul( x );
	const x5 = x.mul( x2, x2 ).clamp( 0, .9999 );

	return f.sub( vec3( f90 ).mul( x5 ) ).div( x5.oneMinus() );

} ).setLayout( {
	name: 'Schlick_to_F0',
	type: 'vec3',
	inputs: [
		{ name: 'f', type: 'vec3' },
		{ name: 'f90', type: 'float' },
		{ name: 'dotVH', type: 'float' }
	]
} );

// https://github.com/google/filament/blob/master/shaders/src/brdf.fs
const D_Charlie = tslFn( ( { roughness, dotNH } ) => {

	const alpha = roughness.pow2();

	// Estevez and Kulla 2017, "Production Friendly Microfacet Sheen BRDF"
	const invAlpha = float( 1.0 ).div( alpha );
	const cos2h = dotNH.pow2();
	const sin2h = cos2h.oneMinus().max( 0.0078125 ); // 2^(-14/2), so sin2h^2 > 0 in fp16

	return float( 2.0 ).add( invAlpha ).mul( sin2h.pow( invAlpha.mul( 0.5 ) ) ).div( 2.0 * Math.PI );

} ).setLayout( {
	name: 'D_Charlie',
	type: 'float',
	inputs: [
		{ name: 'roughness', type: 'float' },
		{ name: 'dotNH', type: 'float' }
	]
} );

// https://github.com/google/filament/blob/master/shaders/src/brdf.fs
const V_Neubelt = tslFn( ( { dotNV, dotNL } ) => {

	// Neubelt and Pettineo 2013, "Crafting a Next-gen Material Pipeline for The Order: 1886"
	return float( 1.0 ).div( float( 4.0 ).mul( dotNL.add( dotNV ).sub( dotNL.mul( dotNV ) ) ) );

} ).setLayout( {
	name: 'V_Neubelt',
	type: 'float',
	inputs: [
		{ name: 'dotNV', type: 'float' },
		{ name: 'dotNL', type: 'float' }
	]
} );

const BRDF_Sheen = tslFn( ( { lightDirection } ) => {

	const halfDir = lightDirection.add( positionViewDirection ).normalize();

	const dotNL = transformedNormalView.dot( lightDirection ).clamp();
	const dotNV = transformedNormalView.dot( positionViewDirection ).clamp();
	const dotNH = transformedNormalView.dot( halfDir ).clamp();

	const D = D_Charlie( { roughness: sheenRoughness, dotNH } );
	const V = V_Neubelt( { dotNV, dotNL } );

	return sheen.mul( D ).mul( V );

} );

// Rect Area Light

// Real-Time Polygonal-Light Shading with Linearly Transformed Cosines
// by Eric Heitz, Jonathan Dupuy, Stephen Hill and David Neubelt
// code: https://github.com/selfshadow/ltc_code/

const LTC_Uv = tslFn( ( { N, V, roughness } ) => {

	const LUT_SIZE = 64.0;
	const LUT_SCALE = ( LUT_SIZE - 1.0 ) / LUT_SIZE;
	const LUT_BIAS = 0.5 / LUT_SIZE;

	const dotNV = N.dot( V ).saturate();

	// texture parameterized by sqrt( GGX alpha ) and sqrt( 1 - cos( theta ) )
	const uv = vec2( roughness, dotNV.oneMinus().sqrt() );

	uv.assign( uv.mul( LUT_SCALE ).add( LUT_BIAS ) );

	return uv;

} ).setLayout( {
	name: 'LTC_Uv',
	type: 'vec2',
	inputs: [
		{ name: 'N', type: 'vec3' },
		{ name: 'V', type: 'vec3' },
		{ name: 'roughness', type: 'float' }
	]
} );

const LTC_ClippedSphereFormFactor = tslFn( ( { f } ) => {

	// Real-Time Area Lighting: a Journey from Research to Production (p.102)
	// An approximation of the form factor of a horizon-clipped rectangle.

	const l = f.length();

	return max$1( l.mul( l ).add( f.z ).div( l.add( 1.0 ) ), 0 );

} ).setLayout( {
	name: 'LTC_ClippedSphereFormFactor',
	type: 'float',
	inputs: [
		{ name: 'f', type: 'vec3' }
	]
} );

const LTC_EdgeVectorFormFactor = tslFn( ( { v1, v2 } ) => {

	const x = v1.dot( v2 );
	const y = x.abs().toVar();

	// rational polynomial approximation to theta / sin( theta ) / 2PI
	const a = y.mul( 0.0145206 ).add( 0.4965155 ).mul( y ).add( 0.8543985 ).toVar();
	const b = y.add( 4.1616724 ).mul( y ).add( 3.4175940 ).toVar();
	const v = a.div( b );

	const theta_sintheta = x.greaterThan( 0.0 ).cond( v, max$1( x.mul( x ).oneMinus(), 1e-7 ).inverseSqrt().mul( 0.5 ).sub( v ) );

	return v1.cross( v2 ).mul( theta_sintheta );

} ).setLayout( {
	name: 'LTC_EdgeVectorFormFactor',
	type: 'vec3',
	inputs: [
		{ name: 'v1', type: 'vec3' },
		{ name: 'v2', type: 'vec3' }
	]
} );

const LTC_Evaluate = tslFn( ( { N, V, P, mInv, p0, p1, p2, p3 } ) => {

	// bail if point is on back side of plane of light
	// assumes ccw winding order of light vertices
	const v1 = p1.sub( p0 ).toVar();
	const v2 = p3.sub( p0 ).toVar();

	const lightNormal = v1.cross( v2 );
	const result = vec3().toVar();

	If( lightNormal.dot( P.sub( p0 ) ).greaterThanEqual( 0.0 ), () => {

		// construct orthonormal basis around N
		const T1 = V.sub( N.mul( V.dot( N ) ) ).normalize();
		const T2 = N.cross( T1 ).negate(); // negated from paper; possibly due to a different handedness of world coordinate system

		// compute transform
		const mat = mInv.mul( mat3( T1, T2, N ).transpose() ).toVar();

		// transform rect
		// & project rect onto sphere
		const coords0 = mat.mul( p0.sub( P ) ).normalize().toVar();
		const coords1 = mat.mul( p1.sub( P ) ).normalize().toVar();
		const coords2 = mat.mul( p2.sub( P ) ).normalize().toVar();
		const coords3 = mat.mul( p3.sub( P ) ).normalize().toVar();

		// calculate vector form factor
		const vectorFormFactor = vec3( 0 ).toVar();
		vectorFormFactor.addAssign( LTC_EdgeVectorFormFactor( { v1: coords0, v2: coords1 } ) );
		vectorFormFactor.addAssign( LTC_EdgeVectorFormFactor( { v1: coords1, v2: coords2 } ) );
		vectorFormFactor.addAssign( LTC_EdgeVectorFormFactor( { v1: coords2, v2: coords3 } ) );
		vectorFormFactor.addAssign( LTC_EdgeVectorFormFactor( { v1: coords3, v2: coords0 } ) );

		// adjust for horizon clipping
		result.assign( vec3( LTC_ClippedSphereFormFactor( { f: vectorFormFactor } ) ) );

	} );

	return result;

} ).setLayout( {
	name: 'LTC_Evaluate',
	type: 'vec3',
	inputs: [
		{ name: 'N', type: 'vec3' },
		{ name: 'V', type: 'vec3' },
		{ name: 'P', type: 'vec3' },
		{ name: 'mInv', type: 'mat3' },
		{ name: 'p0', type: 'vec3' },
		{ name: 'p1', type: 'vec3' },
		{ name: 'p2', type: 'vec3' },
		{ name: 'p3', type: 'vec3' }
	]
} );

//
// Transmission
//

const getVolumeTransmissionRay = tslFn( ( [ n, v, thickness, ior, modelMatrix ] ) => {

	// Direction of refracted light.
	const refractionVector = vec3( refract( v.negate(), normalize( n ), div( 1.0, ior ) ) );

	// Compute rotation-independant scaling of the model matrix.
	const modelScale = vec3(
		length( modelMatrix[ 0 ].xyz ),
		length( modelMatrix[ 1 ].xyz ),
		length( modelMatrix[ 2 ].xyz )
	);

	// The thickness is specified in local space.
	return normalize( refractionVector ).mul( thickness.mul( modelScale ) );

} ).setLayout( {
	name: 'getVolumeTransmissionRay',
	type: 'vec3',
	inputs: [
		{ name: 'n', type: 'vec3' },
		{ name: 'v', type: 'vec3' },
		{ name: 'thickness', type: 'float' },
		{ name: 'ior', type: 'float' },
		{ name: 'modelMatrix', type: 'mat4' }
	]
} );

const applyIorToRoughness = tslFn( ( [ roughness, ior ] ) => {

	// Scale roughness with IOR so that an IOR of 1.0 results in no microfacet refraction and
	// an IOR of 1.5 results in the default amount of microfacet refraction.
	return roughness.mul( clamp( ior.mul( 2.0 ).sub( 2.0 ), 0.0, 1.0 ) );

} ).setLayout( {
	name: 'applyIorToRoughness',
	type: 'float',
	inputs: [
		{ name: 'roughness', type: 'float' },
		{ name: 'ior', type: 'float' }
	]
} );

const singleViewportMipTexture = viewportMipTexture();

const getTransmissionSample = tslFn( ( [ fragCoord, roughness, ior ] ) => {

	const transmissionSample = singleViewportMipTexture.uv( fragCoord );
	//const transmissionSample = viewportMipTexture( fragCoord );

	const lod = log2( float( viewportResolution.x ) ).mul( applyIorToRoughness( roughness, ior ) );

	return transmissionSample.bicubic( lod );

} );

const volumeAttenuation = tslFn( ( [ transmissionDistance, attenuationColor, attenuationDistance ] ) => {

	If( attenuationDistance.notEqual( 0 ), () => {

		// Compute light attenuation using Beer's law.
		const attenuationCoefficient = log( attenuationColor ).negate().div( attenuationDistance );
		const transmittance = exp( attenuationCoefficient.negate().mul( transmissionDistance ) );

		return transmittance;

	} );

	// Attenuation distance is +∞, i.e. the transmitted color is not attenuated at all.
	return vec3( 1.0 );

} ).setLayout( {
	name: 'volumeAttenuation',
	type: 'vec3',
	inputs: [
		{ name: 'transmissionDistance', type: 'float' },
		{ name: 'attenuationColor', type: 'vec3' },
		{ name: 'attenuationDistance', type: 'float' }
	]
} );

const getIBLVolumeRefraction = tslFn( ( [ n, v, roughness, diffuseColor, specularColor, specularF90, position, modelMatrix, viewMatrix, projMatrix, ior, thickness, attenuationColor, attenuationDistance, dispersion ] ) => {

	let transmittedLight, transmittance;

	if ( dispersion ) {

		transmittedLight = vec4().toVar();
		transmittance = vec3().toVar();

		const halfSpread = ior.sub( 1.0 ).mul( dispersion.mul( 0.025 ) );
		const iors = vec3( ior.sub( halfSpread ), ior, ior.add( halfSpread ) );

		loop( { start: 0, end: 3 }, ( { i } ) => {

			const ior = iors.element( i );

			const transmissionRay = getVolumeTransmissionRay( n, v, thickness, ior, modelMatrix );
			const refractedRayExit = position.add( transmissionRay );

			// Project refracted vector on the framebuffer, while mapping to normalized device coordinates.
			const ndcPos = projMatrix.mul( viewMatrix.mul( vec4( refractedRayExit, 1.0 ) ) );
			const refractionCoords = vec2( ndcPos.xy.div( ndcPos.w ) ).toVar();
			refractionCoords.addAssign( 1.0 );
			refractionCoords.divAssign( 2.0 );
			refractionCoords.assign( vec2( refractionCoords.x, refractionCoords.y.oneMinus() ) ); // webgpu

			// Sample framebuffer to get pixel the refracted ray hits.
			const transmissionSample = getTransmissionSample( refractionCoords, roughness, ior );

			transmittedLight.element( i ).assign( transmissionSample.element( i ) );
			transmittedLight.a.addAssign( transmissionSample.a );

			transmittance.element( i ).assign( diffuseColor.element( i ).mul( volumeAttenuation( length( transmissionRay ), attenuationColor, attenuationDistance ).element( i ) ) );

		} );

		transmittedLight.a.divAssign( 3.0 );

	} else {

		const transmissionRay = getVolumeTransmissionRay( n, v, thickness, ior, modelMatrix );
		const refractedRayExit = position.add( transmissionRay );

		// Project refracted vector on the framebuffer, while mapping to normalized device coordinates.
		const ndcPos = projMatrix.mul( viewMatrix.mul( vec4( refractedRayExit, 1.0 ) ) );
		const refractionCoords = vec2( ndcPos.xy.div( ndcPos.w ) ).toVar();
		refractionCoords.addAssign( 1.0 );
		refractionCoords.divAssign( 2.0 );
		refractionCoords.assign( vec2( refractionCoords.x, refractionCoords.y.oneMinus() ) ); // webgpu

		// Sample framebuffer to get pixel the refracted ray hits.
		transmittedLight = getTransmissionSample( refractionCoords, roughness, ior );
		transmittance = diffuseColor.mul( volumeAttenuation( length( transmissionRay ), attenuationColor, attenuationDistance ) );

	}

	const attenuatedColor = transmittance.rgb.mul( transmittedLight.rgb );
	const dotNV = n.dot( v ).clamp();

	// Get the specular component.
	const F = vec3( EnvironmentBRDF( { // n, v, specularColor, specularF90, roughness
		dotNV,
		specularColor,
		specularF90,
		roughness
	} ) );

	// As less light is transmitted, the opacity should be increased. This simple approximation does a decent job
	// of modulating a CSS background, and has no effect when the buffer is opaque, due to a solid object or clear color.
	const transmittanceFactor = transmittance.r.add( transmittance.g, transmittance.b ).div( 3.0 );

	return vec4( F.oneMinus().mul( attenuatedColor ), transmittedLight.a.oneMinus().mul( transmittanceFactor ).oneMinus() );

} );

//
// Iridescence
//

// XYZ to linear-sRGB color space
const XYZ_TO_REC709 = mat3(
	3.2404542, - 0.9692660, 0.0556434,
	- 1.5371385, 1.8760108, - 0.2040259,
	- 0.4985314, 0.0415560, 1.0572252
);

// Assume air interface for top
// Note: We don't handle the case fresnel0 == 1
const Fresnel0ToIor = ( fresnel0 ) => {

	const sqrtF0 = fresnel0.sqrt();
	return vec3( 1.0 ).add( sqrtF0 ).div( vec3( 1.0 ).sub( sqrtF0 ) );

};

// ior is a value between 1.0 and 3.0. 1.0 is air interface
const IorToFresnel0 = ( transmittedIor, incidentIor ) => {

	return transmittedIor.sub( incidentIor ).div( transmittedIor.add( incidentIor ) ).pow2();

};

// Fresnel equations for dielectric/dielectric interfaces.
// Ref: https://belcour.github.io/blog/research/2017/05/01/brdf-thin-film.html
// Evaluation XYZ sensitivity curves in Fourier space
const evalSensitivity = ( OPD, shift ) => {

	const phase = OPD.mul( 2.0 * Math.PI * 1.0e-9 );
	const val = vec3( 5.4856e-13, 4.4201e-13, 5.2481e-13 );
	const pos = vec3( 1.6810e+06, 1.7953e+06, 2.2084e+06 );
	const VAR = vec3( 4.3278e+09, 9.3046e+09, 6.6121e+09 );

	const x = float( 9.7470e-14 * Math.sqrt( 2.0 * Math.PI * 4.5282e+09 ) ).mul( phase.mul( 2.2399e+06 ).add( shift.x ).cos() ).mul( phase.pow2().mul( - 4.5282e+09 ).exp() );

	let xyz = val.mul( VAR.mul( 2.0 * Math.PI ).sqrt() ).mul( pos.mul( phase ).add( shift ).cos() ).mul( phase.pow2().negate().mul( VAR ).exp() );
	xyz = vec3( xyz.x.add( x ), xyz.y, xyz.z ).div( 1.0685e-7 );

	const rgb = XYZ_TO_REC709.mul( xyz );

	return rgb;

};

const evalIridescence = tslFn( ( { outsideIOR, eta2, cosTheta1, thinFilmThickness, baseF0 } ) => {

	// Force iridescenceIOR -> outsideIOR when thinFilmThickness -> 0.0
	const iridescenceIOR = mix( outsideIOR, eta2, smoothstep( 0.0, 0.03, thinFilmThickness ) );
	// Evaluate the cosTheta on the base layer (Snell law)
	const sinTheta2Sq = outsideIOR.div( iridescenceIOR ).pow2().mul( float( 1 ).sub( cosTheta1.pow2() ) );

	// Handle TIR:
	const cosTheta2Sq = float( 1 ).sub( sinTheta2Sq );
	/*if ( cosTheta2Sq < 0.0 ) {

			return vec3( 1.0 );

	}*/

	const cosTheta2 = cosTheta2Sq.sqrt();

	// First interface
	const R0 = IorToFresnel0( iridescenceIOR, outsideIOR );
	const R12 = F_Schlick( { f0: R0, f90: 1.0, dotVH: cosTheta1 } );
	//const R21 = R12;
	const T121 = R12.oneMinus();
	const phi12 = iridescenceIOR.lessThan( outsideIOR ).cond( Math.PI, 0.0 );
	const phi21 = float( Math.PI ).sub( phi12 );

	// Second interface
	const baseIOR = Fresnel0ToIor( baseF0.clamp( 0.0, 0.9999 ) ); // guard against 1.0
	const R1 = IorToFresnel0( baseIOR, iridescenceIOR.toVec3() );
	const R23 = F_Schlick( { f0: R1, f90: 1.0, dotVH: cosTheta2 } );
	const phi23 = vec3(
		baseIOR.x.lessThan( iridescenceIOR ).cond( Math.PI, 0.0 ),
		baseIOR.y.lessThan( iridescenceIOR ).cond( Math.PI, 0.0 ),
		baseIOR.z.lessThan( iridescenceIOR ).cond( Math.PI, 0.0 )
	);

	// Phase shift
	const OPD = iridescenceIOR.mul( thinFilmThickness, cosTheta2, 2.0 );
	const phi = vec3( phi21 ).add( phi23 );

	// Compound terms
	const R123 = R12.mul( R23 ).clamp( 1e-5, 0.9999 );
	const r123 = R123.sqrt();
	const Rs = T121.pow2().mul( R23 ).div( vec3( 1.0 ).sub( R123 ) );

	// Reflectance term for m = 0 (DC term amplitude)
	const C0 = R12.add( Rs );
	let I = C0;

	// Reflectance term for m > 0 (pairs of diracs)
	let Cm = Rs.sub( T121 );
	for ( let m = 1; m <= 2; ++ m ) {

		Cm = Cm.mul( r123 );
		const Sm = evalSensitivity( float( m ).mul( OPD ), float( m ).mul( phi ) ).mul( 2.0 );
		I = I.add( Cm.mul( Sm ) );

	}

	// Since out of gamut colors might be produced, negative color values are clamped to 0.
	return I.max( vec3( 0.0 ) );

} ).setLayout( {
	name: 'evalIridescence',
	type: 'vec3',
	inputs: [
		{ name: 'outsideIOR', type: 'float' },
		{ name: 'eta2', type: 'float' },
		{ name: 'cosTheta1', type: 'float' },
		{ name: 'thinFilmThickness', type: 'float' },
		{ name: 'baseF0', type: 'vec3' }
	]
} );

//
//	Sheen
//

// This is a curve-fit approxmation to the "Charlie sheen" BRDF integrated over the hemisphere from
// Estevez and Kulla 2017, "Production Friendly Microfacet Sheen BRDF". The analysis can be found
// in the Sheen section of https://drive.google.com/file/d/1T0D1VSyR4AllqIJTQAraEIzjlb5h4FKH/view?usp=sharing
const IBLSheenBRDF = tslFn( ( { normal, viewDir, roughness } ) => {

	const dotNV = normal.dot( viewDir ).saturate();

	const r2 = roughness.pow2();

	const a = cond(
		roughness.lessThan( 0.25 ),
		float( - 339.2 ).mul( r2 ).add( float( 161.4 ).mul( roughness ) ).sub( 25.9 ),
		float( - 8.48 ).mul( r2 ).add( float( 14.3 ).mul( roughness ) ).sub( 9.95 )
	);

	const b = cond(
		roughness.lessThan( 0.25 ),
		float( 44.0 ).mul( r2 ).sub( float( 23.7 ).mul( roughness ) ).add( 3.26 ),
		float( 1.97 ).mul( r2 ).sub( float( 3.27 ).mul( roughness ) ).add( 0.72 )
	);

	const DG = cond( roughness.lessThan( 0.25 ), 0.0, float( 0.1 ).mul( roughness ).sub( 0.025 ) ).add( a.mul( dotNV ).add( b ).exp() );

	return DG.mul( 1.0 / Math.PI ).saturate();

} );

const clearcoatF0 = vec3( 0.04 );
const clearcoatF90 = float( 1 );

//

class PhysicalLightingModel extends LightingModel {

	constructor( clearcoat = false, sheen = false, iridescence = false, anisotropy = false, transmission = false, dispersion = false ) {

		super();

		this.clearcoat = clearcoat;
		this.sheen = sheen;
		this.iridescence = iridescence;
		this.anisotropy = anisotropy;
		this.transmission = transmission;
		this.dispersion = dispersion;

		this.clearcoatRadiance = null;
		this.clearcoatSpecularDirect = null;
		this.clearcoatSpecularIndirect = null;
		this.sheenSpecularDirect = null;
		this.sheenSpecularIndirect = null;
		this.iridescenceFresnel = null;
		this.iridescenceF0 = null;

	}

	start( context ) {

		if ( this.clearcoat === true ) {

			this.clearcoatRadiance = vec3().temp( 'clearcoatRadiance' );
			this.clearcoatSpecularDirect = vec3().temp( 'clearcoatSpecularDirect' );
			this.clearcoatSpecularIndirect = vec3().temp( 'clearcoatSpecularIndirect' );

		}

		if ( this.sheen === true ) {

			this.sheenSpecularDirect = vec3().temp( 'sheenSpecularDirect' );
			this.sheenSpecularIndirect = vec3().temp( 'sheenSpecularIndirect' );

		}

		if ( this.iridescence === true ) {

			const dotNVi = transformedNormalView.dot( positionViewDirection ).clamp();

			this.iridescenceFresnel = evalIridescence( {
				outsideIOR: float( 1.0 ),
				eta2: iridescenceIOR,
				cosTheta1: dotNVi,
				thinFilmThickness: iridescenceThickness,
				baseF0: specularColor
			} );

			this.iridescenceF0 = Schlick_to_F0( { f: this.iridescenceFresnel, f90: 1.0, dotVH: dotNVi } );

		}

		if ( this.transmission === true ) {

			const position = positionWorld;
			const v = cameraPosition.sub( positionWorld ).normalize(); // TODO: Create Node for this, same issue in MaterialX
			const n = transformedNormalWorld;

			context.backdrop = getIBLVolumeRefraction(
				n,
				v,
				roughness,
				diffuseColor,
				specularColor,
				specularF90, // specularF90
				position, // positionWorld
				modelWorldMatrix, // modelMatrix
				cameraViewMatrix, // viewMatrix
				cameraProjectionMatrix, // projMatrix
				ior,
				thickness,
				attenuationColor,
				attenuationDistance,
				this.dispersion ? dispersion : null
			);

			context.backdropAlpha = transmission;

			diffuseColor.a.mulAssign( mix( 1, context.backdrop.a, transmission ) );

		}

	}

	// Fdez-Agüera's "Multiple-Scattering Microfacet Model for Real-Time Image Based Lighting"
	// Approximates multiscattering in order to preserve energy.
	// http://www.jcgt.org/published/0008/01/03/

	computeMultiscattering( singleScatter, multiScatter, specularF90 ) {

		const dotNV = transformedNormalView.dot( positionViewDirection ).clamp(); // @ TODO: Move to core dotNV

		const fab = DFGApprox( { roughness, dotNV } );

		const Fr = this.iridescenceF0 ? iridescence.mix( specularColor, this.iridescenceF0 ) : specularColor;

		const FssEss = Fr.mul( fab.x ).add( specularF90.mul( fab.y ) );

		const Ess = fab.x.add( fab.y );
		const Ems = Ess.oneMinus();

		const Favg = specularColor.add( specularColor.oneMinus().mul( 0.047619 ) ); // 1/21
		const Fms = FssEss.mul( Favg ).div( Ems.mul( Favg ).oneMinus() );

		singleScatter.addAssign( FssEss );
		multiScatter.addAssign( Fms.mul( Ems ) );

	}

	direct( { lightDirection, lightColor, reflectedLight } ) {

		const dotNL = transformedNormalView.dot( lightDirection ).clamp();
		const irradiance = dotNL.mul( lightColor );

		if ( this.sheen === true ) {

			this.sheenSpecularDirect.addAssign( irradiance.mul( BRDF_Sheen( { lightDirection } ) ) );

		}

		if ( this.clearcoat === true ) {

			const dotNLcc = transformedClearcoatNormalView.dot( lightDirection ).clamp();
			const ccIrradiance = dotNLcc.mul( lightColor );

			this.clearcoatSpecularDirect.addAssign( ccIrradiance.mul( BRDF_GGX( { lightDirection, f0: clearcoatF0, f90: clearcoatF90, roughness: clearcoatRoughness, normalView: transformedClearcoatNormalView } ) ) );

		}

		reflectedLight.directDiffuse.addAssign( irradiance.mul( BRDF_Lambert( { diffuseColor: diffuseColor.rgb } ) ) );

		reflectedLight.directSpecular.addAssign( irradiance.mul( BRDF_GGX( { lightDirection, f0: specularColor, f90: 1, roughness, iridescence: this.iridescence, f: this.iridescenceFresnel, USE_IRIDESCENCE: this.iridescence, USE_ANISOTROPY: this.anisotropy } ) ) );

	}

	directRectArea( { lightColor, lightPosition, halfWidth, halfHeight, reflectedLight, ltc_1, ltc_2 } ) {

		const p0 = lightPosition.add( halfWidth ).sub( halfHeight ); // counterclockwise; light shines in local neg z direction
		const p1 = lightPosition.sub( halfWidth ).sub( halfHeight );
		const p2 = lightPosition.sub( halfWidth ).add( halfHeight );
		const p3 = lightPosition.add( halfWidth ).add( halfHeight );

		const N = transformedNormalView;
		const V = positionViewDirection;
		const P = positionView.toVar();

		const uv = LTC_Uv( { N, V, roughness } );

		const t1 = ltc_1.uv( uv ).toVar();
		const t2 = ltc_2.uv( uv ).toVar();

		const mInv = mat3(
			vec3( t1.x, 0, t1.y ),
			vec3( 0, 1, 0 ),
			vec3( t1.z, 0, t1.w )
		).toVar();

		// LTC Fresnel Approximation by Stephen Hill
		// http://blog.selfshadow.com/publications/s2016-advances/s2016_ltc_fresnel.pdf
		const fresnel = specularColor.mul( t2.x ).add( specularColor.oneMinus().mul( t2.y ) ).toVar();

		reflectedLight.directSpecular.addAssign( lightColor.mul( fresnel ).mul( LTC_Evaluate( { N, V, P, mInv, p0, p1, p2, p3 } ) ) );

		reflectedLight.directDiffuse.addAssign( lightColor.mul( diffuseColor ).mul( LTC_Evaluate( { N, V, P, mInv: mat3( 1, 0, 0, 0, 1, 0, 0, 0, 1 ), p0, p1, p2, p3 } ) ) );

	}

	indirectDiffuse( { irradiance, reflectedLight } ) {

		reflectedLight.indirectDiffuse.addAssign( irradiance.mul( BRDF_Lambert( { diffuseColor } ) ) );

	}

	indirectSpecular( { radiance, iblIrradiance, reflectedLight } ) {

		if ( this.sheen === true ) {

			this.sheenSpecularIndirect.addAssign( iblIrradiance.mul(
				sheen,
				IBLSheenBRDF( {
					normal: transformedNormalView,
					viewDir: positionViewDirection,
					roughness: sheenRoughness
				} )
			) );

		}

		if ( this.clearcoat === true ) {

			const dotNVcc = transformedClearcoatNormalView.dot( positionViewDirection ).clamp();

			const clearcoatEnv = EnvironmentBRDF( {
				dotNV: dotNVcc,
				specularColor: clearcoatF0,
				specularF90: clearcoatF90,
				roughness: clearcoatRoughness
			} );

			this.clearcoatSpecularIndirect.addAssign( this.clearcoatRadiance.mul( clearcoatEnv ) );

		}

		// Both indirect specular and indirect diffuse light accumulate here

		const singleScattering = vec3().temp( 'singleScattering' );
		const multiScattering = vec3().temp( 'multiScattering' );
		const cosineWeightedIrradiance = iblIrradiance.mul( 1 / Math.PI );

		this.computeMultiscattering( singleScattering, multiScattering, specularF90 );

		const totalScattering = singleScattering.add( multiScattering );

		const diffuse = diffuseColor.mul( totalScattering.r.max( totalScattering.g ).max( totalScattering.b ).oneMinus() );

		reflectedLight.indirectSpecular.addAssign( radiance.mul( singleScattering ) );
		reflectedLight.indirectSpecular.addAssign( multiScattering.mul( cosineWeightedIrradiance ) );

		reflectedLight.indirectDiffuse.addAssign( diffuse.mul( cosineWeightedIrradiance ) );

	}

	ambientOcclusion( { ambientOcclusion, reflectedLight } ) {

		const dotNV = transformedNormalView.dot( positionViewDirection ).clamp(); // @ TODO: Move to core dotNV

		const aoNV = dotNV.add( ambientOcclusion );
		const aoExp = roughness.mul( - 16.0 ).oneMinus().negate().exp2();

		const aoNode = ambientOcclusion.sub( aoNV.pow( aoExp ).oneMinus() ).clamp();

		if ( this.clearcoat === true ) {

			this.clearcoatSpecularIndirect.mulAssign( ambientOcclusion );

		}

		if ( this.sheen === true ) {

			this.sheenSpecularIndirect.mulAssign( ambientOcclusion );

		}

		reflectedLight.indirectDiffuse.mulAssign( ambientOcclusion );
		reflectedLight.indirectSpecular.mulAssign( aoNode );

	}

	finish( context ) {

		const { outgoingLight } = context;

		if ( this.clearcoat === true ) {

			const dotNVcc = transformedClearcoatNormalView.dot( positionViewDirection ).clamp();

			const Fcc = F_Schlick( {
				dotVH: dotNVcc,
				f0: clearcoatF0,
				f90: clearcoatF90
			} );

			const clearcoatLight = outgoingLight.mul( clearcoat.mul( Fcc ).oneMinus() ).add( this.clearcoatSpecularDirect.add( this.clearcoatSpecularIndirect ).mul( clearcoat ) );

			outgoingLight.assign( clearcoatLight );

		}

		if ( this.sheen === true ) {

			const sheenEnergyComp = sheen.r.max( sheen.g ).max( sheen.b ).mul( 0.157 ).oneMinus();
			const sheenLight = outgoingLight.mul( sheenEnergyComp ).add( this.sheenSpecularDirect, this.sheenSpecularIndirect );

			outgoingLight.assign( sheenLight );

		}

	}

}

const defaultValues$6 = new MeshStandardMaterial();

class MeshStandardNodeMaterial extends NodeMaterial {

	constructor( parameters ) {

		super();

		this.isMeshStandardNodeMaterial = true;

		this.emissiveNode = null;

		this.metalnessNode = null;
		this.roughnessNode = null;

		this.setDefaultValues( defaultValues$6 );

		this.setValues( parameters );

	}

	setupEnvironment( builder ) {

		const envNode = super.setupEnvironment( builder );

		return envNode ? new EnvironmentNode( envNode ) : null;

	}

	setupLightingModel( /*builder*/ ) {

		return new PhysicalLightingModel();

	}

	setupSpecular() {

		const specularColorNode = mix( vec3( 0.04 ), diffuseColor.rgb, metalness );

		specularColor.assign( specularColorNode );
		specularF90.assign( 1.0 );

	}

	setupVariants() {

		// METALNESS

		const metalnessNode = this.metalnessNode ? float( this.metalnessNode ) : materialMetalness;

		metalness.assign( metalnessNode );

		// ROUGHNESS

		let roughnessNode = this.roughnessNode ? float( this.roughnessNode ) : materialRoughness;
		roughnessNode = getRoughness( { roughness: roughnessNode } );

		roughness.assign( roughnessNode );

		// SPECULAR COLOR

		this.setupSpecular();

		// DIFFUSE COLOR

		diffuseColor.assign( vec4( diffuseColor.rgb.mul( metalnessNode.oneMinus() ), diffuseColor.a ) );

	}

	copy( source ) {

		this.emissiveNode = source.emissiveNode;

		this.metalnessNode = source.metalnessNode;
		this.roughnessNode = source.roughnessNode;

		return super.copy( source );

	}

}

addNodeMaterial( 'MeshStandardNodeMaterial', MeshStandardNodeMaterial );

const defaultValues$5 = new MeshPhysicalMaterial();

class MeshPhysicalNodeMaterial extends MeshStandardNodeMaterial {

	constructor( parameters ) {

		super();

		this.isMeshPhysicalNodeMaterial = true;

		this.clearcoatNode = null;
		this.clearcoatRoughnessNode = null;
		this.clearcoatNormalNode = null;

		this.sheenNode = null;
		this.sheenRoughnessNode = null;

		this.iridescenceNode = null;
		this.iridescenceIORNode = null;
		this.iridescenceThicknessNode = null;

		this.specularIntensityNode = null;
		this.specularColorNode = null;

		this.iorNode = null;
		this.transmissionNode = null;
		this.thicknessNode = null;
		this.attenuationDistanceNode = null;
		this.attenuationColorNode = null;
		this.dispersionNode = null;

		this.anisotropyNode = null;

		this.setDefaultValues( defaultValues$5 );

		this.setValues( parameters );

	}

	get useClearcoat() {

		return this.clearcoat > 0 || this.clearcoatNode !== null;

	}

	get useIridescence() {

		return this.iridescence > 0 || this.iridescenceNode !== null;

	}

	get useSheen() {

		return this.sheen > 0 || this.sheenNode !== null;

	}

	get useAnisotropy() {

		return this.anisotropy > 0 || this.anisotropyNode !== null;

	}

	get useTransmission() {

		return this.transmission > 0 || this.transmissionNode !== null;

	}

	get useDispersion() {

		return this.dispersion > 0 || this.dispersionNode !== null;

	}

	setupSpecular() {

		const iorNode = this.iorNode ? float( this.iorNode ) : materialIOR;

		ior.assign( iorNode );
		specularColor.assign( mix( min$1( pow2( ior.sub( 1.0 ).div( ior.add( 1.0 ) ) ).mul( materialSpecularColor ), vec3( 1.0 ) ).mul( materialSpecularIntensity ), diffuseColor.rgb, metalness ) );
		specularF90.assign( mix( materialSpecularIntensity, 1.0, metalness ) );

	}

	setupLightingModel( /*builder*/ ) {

		return new PhysicalLightingModel( this.useClearcoat, this.useSheen, this.useIridescence, this.useAnisotropy, this.useTransmission, this.useDispersion );

	}

	setupVariants( builder ) {

		super.setupVariants( builder );

		// CLEARCOAT

		if ( this.useClearcoat ) {

			const clearcoatNode = this.clearcoatNode ? float( this.clearcoatNode ) : materialClearcoat;
			const clearcoatRoughnessNode = this.clearcoatRoughnessNode ? float( this.clearcoatRoughnessNode ) : materialClearcoatRoughness;

			clearcoat.assign( clearcoatNode );
			clearcoatRoughness.assign( getRoughness( { roughness: clearcoatRoughnessNode } ) );

		}

		// SHEEN

		if ( this.useSheen ) {

			const sheenNode = this.sheenNode ? vec3( this.sheenNode ) : materialSheen;
			const sheenRoughnessNode = this.sheenRoughnessNode ? float( this.sheenRoughnessNode ) : materialSheenRoughness;

			sheen.assign( sheenNode );
			sheenRoughness.assign( sheenRoughnessNode );

		}

		// IRIDESCENCE

		if ( this.useIridescence ) {

			const iridescenceNode = this.iridescenceNode ? float( this.iridescenceNode ) : materialIridescence;
			const iridescenceIORNode = this.iridescenceIORNode ? float( this.iridescenceIORNode ) : materialIridescenceIOR;
			const iridescenceThicknessNode = this.iridescenceThicknessNode ? float( this.iridescenceThicknessNode ) : materialIridescenceThickness;

			iridescence.assign( iridescenceNode );
			iridescenceIOR.assign( iridescenceIORNode );
			iridescenceThickness.assign( iridescenceThicknessNode );

		}

		// ANISOTROPY

		if ( this.useAnisotropy ) {

			const anisotropyV = ( this.anisotropyNode ? vec2( this.anisotropyNode ) : materialAnisotropy ).toVar();

			anisotropy.assign( anisotropyV.length() );

			If( anisotropy.equal( 0.0 ), () => {

				anisotropyV.assign( vec2( 1.0, 0.0 ) );

			} ).else( () => {

				anisotropyV.divAssign( vec2( anisotropy ) );
				anisotropy.assign( anisotropy.saturate() );

			} );

			// Roughness along the anisotropy bitangent is the material roughness, while the tangent roughness increases with anisotropy.
			alphaT.assign( anisotropy.pow2().mix( roughness.pow2(), 1.0 ) );

			anisotropyT.assign( TBNViewMatrix[ 0 ].mul( anisotropyV.x ).add( TBNViewMatrix[ 1 ].mul( anisotropyV.y ) ) );
			anisotropyB.assign( TBNViewMatrix[ 1 ].mul( anisotropyV.x ).sub( TBNViewMatrix[ 0 ].mul( anisotropyV.y ) ) );

		}

		// TRANSMISSION

		if ( this.useTransmission ) {

			const transmissionNode = this.transmissionNode ? float( this.transmissionNode ) : materialTransmission;
			const thicknessNode = this.thicknessNode ? float( this.thicknessNode ) : materialThickness;
			const attenuationDistanceNode = this.attenuationDistanceNode ? float( this.attenuationDistanceNode ) : materialAttenuationDistance;
			const attenuationColorNode = this.attenuationColorNode ? vec3( this.attenuationColorNode ) : materialAttenuationColor;

			transmission.assign( transmissionNode );
			thickness.assign( thicknessNode );
			attenuationDistance.assign( attenuationDistanceNode );
			attenuationColor.assign( attenuationColorNode );

			if ( this.useDispersion ) {

				const dispersionNode = this.dispersionNode ? float( this.dispersionNode ) : materialDispersion;

				dispersion.assign( dispersionNode );

			}

		}

	}

	setupNormal( builder ) {

		super.setupNormal( builder );

		// CLEARCOAT NORMAL

		const clearcoatNormalNode = this.clearcoatNormalNode ? vec3( this.clearcoatNormalNode ) : materialClearcoatNormal;

		transformedClearcoatNormalView.assign( clearcoatNormalNode );

	}

	copy( source ) {

		this.clearcoatNode = source.clearcoatNode;
		this.clearcoatRoughnessNode = source.clearcoatRoughnessNode;
		this.clearcoatNormalNode = source.clearcoatNormalNode;

		this.sheenNode = source.sheenNode;
		this.sheenRoughnessNode = source.sheenRoughnessNode;

		this.iridescenceNode = source.iridescenceNode;
		this.iridescenceIORNode = source.iridescenceIORNode;
		this.iridescenceThicknessNode = source.iridescenceThicknessNode;

		this.specularIntensityNode = source.specularIntensityNode;
		this.specularColorNode = source.specularColorNode;

		this.transmissionNode = source.transmissionNode;
		this.thicknessNode = source.thicknessNode;
		this.attenuationDistanceNode = source.attenuationDistanceNode;
		this.attenuationColorNode = source.attenuationColorNode;
		this.dispersionNode = source.dispersionNode;

		this.anisotropyNode = source.anisotropyNode;

		return super.copy( source );

	}

}

addNodeMaterial( 'MeshPhysicalNodeMaterial', MeshPhysicalNodeMaterial );

class SSSLightingModel extends PhysicalLightingModel {

	constructor( useClearcoat, useSheen, useIridescence, useSSS ) {

		super( useClearcoat, useSheen, useIridescence );

		this.useSSS = useSSS;

	}

	direct( { lightDirection, lightColor, reflectedLight }, stack, builder ) {

		if ( this.useSSS === true ) {

			const material = builder.material;

			const { thicknessColorNode, thicknessDistortionNode, thicknessAmbientNode, thicknessAttenuationNode, thicknessPowerNode, thicknessScaleNode } = material;

			const scatteringHalf = lightDirection.add( transformedNormalView.mul( thicknessDistortionNode ) ).normalize();
			const scatteringDot = float( positionViewDirection.dot( scatteringHalf.negate() ).saturate().pow( thicknessPowerNode ).mul( thicknessScaleNode ) );
			const scatteringIllu = vec3( scatteringDot.add( thicknessAmbientNode ).mul( thicknessColorNode ) );

			reflectedLight.directDiffuse.addAssign( scatteringIllu.mul( thicknessAttenuationNode.mul( lightColor ) ) );

		}

		super.direct( { lightDirection, lightColor, reflectedLight }, stack, builder );

	}

}

class MeshSSSNodeMaterial extends MeshPhysicalNodeMaterial {

	constructor( parameters ) {

		super( parameters );

		this.thicknessColorNode = null;
		this.thicknessDistortionNode = float( 0.1 );
		this.thicknessAmbientNode = float( 0.0 );
		this.thicknessAttenuationNode = float( .1 );
		this.thicknessPowerNode = float( 2.0 );
		this.thicknessScaleNode = float( 10.0 );

	}

	get useSSS() {

		return this.thicknessColorNode !== null;

	}

	setupLightingModel( /*builder*/ ) {

		return new SSSLightingModel( this.useClearcoat, this.useSheen, this.useIridescence, this.useSSS );

	}

	copy( source ) {

		this.thicknessColorNode = source.thicknessColorNode;
		this.thicknessDistortionNode = source.thicknessDistortionNode;
		this.thicknessAmbientNode = source.thicknessAmbientNode;
		this.thicknessAttenuationNode = source.thicknessAttenuationNode;
		this.thicknessPowerNode = source.thicknessPowerNode;
		this.thicknessScaleNode = source.thicknessScaleNode;

		return super.copy( source );

	}

}

addNodeMaterial( 'MeshSSSNodeMaterial', MeshSSSNodeMaterial );

const getGradientIrradiance = tslFn( ( { normal, lightDirection, builder } ) => {

	// dotNL will be from -1.0 to 1.0
	const dotNL = normal.dot( lightDirection );
	const coord = vec2( dotNL.mul( 0.5 ).add( 0.5 ), 0.0 );

	if ( builder.material.gradientMap ) {

		const gradientMap = materialReference( 'gradientMap', 'texture' ).context( { getUV: () => coord } );

		return vec3( gradientMap.r );

	} else {

		const fw = coord.fwidth().mul( 0.5 );

		return mix( vec3( 0.7 ), vec3( 1.0 ), smoothstep( float( 0.7 ).sub( fw.x ), float( 0.7 ).add( fw.x ), coord.x ) );

	}

} );

class ToonLightingModel extends LightingModel {

	direct( { lightDirection, lightColor, reflectedLight }, stack, builder ) {

		const irradiance = getGradientIrradiance( { normal: normalGeometry, lightDirection, builder } ).mul( lightColor );

		reflectedLight.directDiffuse.addAssign( irradiance.mul( BRDF_Lambert( { diffuseColor: diffuseColor.rgb } ) ) );

	}

	indirectDiffuse( { irradiance, reflectedLight } ) {

		reflectedLight.indirectDiffuse.addAssign( irradiance.mul( BRDF_Lambert( { diffuseColor } ) ) );

	}

}

const defaultValues$4 = new MeshToonMaterial();

class MeshToonNodeMaterial extends NodeMaterial {

	constructor( parameters ) {

		super();

		this.isMeshToonNodeMaterial = true;

		this.lights = true;

		this.setDefaultValues( defaultValues$4 );

		this.setValues( parameters );

	}

	setupLightingModel( /*builder*/ ) {

		return new ToonLightingModel();

	}

}

addNodeMaterial( 'MeshToonNodeMaterial', MeshToonNodeMaterial );

const defaultValues$3 = new MeshMatcapMaterial();

class MeshMatcapNodeMaterial extends NodeMaterial {

	constructor( parameters ) {

		super();

		this.lights = false;

		this.isMeshMatcapNodeMaterial = true;

		this.setDefaultValues( defaultValues$3 );

		this.setValues( parameters );

	}

	setupVariants( builder ) {

		const uv = matcapUV;

		let matcapColor;

		if ( builder.material.matcap ) {

			matcapColor = materialReference( 'matcap', 'texture' ).context( { getUV: () => uv } );

		} else {

			matcapColor = vec3( mix( 0.2, 0.8, uv.y ) ); // default if matcap is missing

		}

		diffuseColor.rgb.mulAssign( matcapColor.rgb );

	}

}

addNodeMaterial( 'MeshMatcapNodeMaterial', MeshMatcapNodeMaterial );

const defaultValues$2 = new PointsMaterial();

class PointsNodeMaterial extends NodeMaterial {

	constructor( parameters ) {

		super();

		this.isPointsNodeMaterial = true;

		this.lights = false;
		this.normals = false;
		this.transparent = true;

		this.sizeNode = null;

		this.setDefaultValues( defaultValues$2 );

		this.setValues( parameters );

	}

	copy( source ) {

		this.sizeNode = source.sizeNode;

		return super.copy( source );

	}

}

addNodeMaterial( 'PointsNodeMaterial', PointsNodeMaterial );

const defaultValues$1 = new SpriteMaterial();

class SpriteNodeMaterial extends NodeMaterial {

	constructor( parameters ) {

		super();

		this.isSpriteNodeMaterial = true;

		this.lights = false;
		this.normals = false;

		this.positionNode = null;
		this.rotationNode = null;
		this.scaleNode = null;

		this.setDefaultValues( defaultValues$1 );

		this.setValues( parameters );

	}

	setupPosition( { object, context } ) {

		// < VERTEX STAGE >

		const { positionNode, rotationNode, scaleNode } = this;

		const vertex = positionLocal;

		let mvPosition = modelViewMatrix.mul( vec3( positionNode || 0 ) );

		let scale = vec2( modelWorldMatrix[ 0 ].xyz.length(), modelWorldMatrix[ 1 ].xyz.length() );

		if ( scaleNode !== null ) {

			scale = scale.mul( scaleNode );

		}

		let alignedPosition = vertex.xy;

		if ( object.center && object.center.isVector2 === true ) {

			alignedPosition = alignedPosition.sub( uniform( object.center ).sub( 0.5 ) );

		}

		alignedPosition = alignedPosition.mul( scale );

		const rotation = float( rotationNode || materialRotation );

		const rotatedPosition = alignedPosition.rotate( rotation );

		mvPosition = vec4( mvPosition.xy.add( rotatedPosition ), mvPosition.zw );

		const modelViewProjection = cameraProjectionMatrix.mul( mvPosition );

		context.vertex = vertex;

		return modelViewProjection;

	}

	copy( source ) {

		this.positionNode = source.positionNode;
		this.rotationNode = source.rotationNode;
		this.scaleNode = source.scaleNode;

		return super.copy( source );

	}

}

addNodeMaterial( 'SpriteNodeMaterial', SpriteNodeMaterial );

class ShadowMaskModel extends LightingModel {

	constructor() {

		super();

		this.shadowNode = float( 1 ).toVar( 'shadowMask' );

	}

	direct( { shadowMask } ) {

		this.shadowNode.mulAssign( shadowMask );

	}

	finish( context ) {

		diffuseColor.a.mulAssign( this.shadowNode.oneMinus() );

		context.outgoingLight.rgb.assign( diffuseColor.rgb ); // TODO: Optimize LightsNode to avoid this assignment

	}

}

const defaultValues = new ShadowMaterial();

class ShadowNodeMaterial extends NodeMaterial {

	constructor( parameters ) {

		super();

		this.isShadowNodeMaterial = true;

		this.lights = true;

		this.setDefaultValues( defaultValues );

		this.setValues( parameters );

	}

	setupLightingModel( /*builder*/ ) {

		return new ShadowMaskModel();

	}

}

addNodeMaterial( 'ShadowNodeMaterial', ShadowNodeMaterial );

class VolumeNodeMaterial extends NodeMaterial {

	constructor( params = {} ) {

		super();

		this.normals = false;
		this.lights = false;
		this.isVolumeNodeMaterial = true;
		this.testNode = null;

		this.setValues( params );

	}

	setup( builder ) {

		const map = texture3D( this.map, null, 0 );

		const hitBox = tslFn( ( { orig, dir } ) => {

			const box_min = vec3( - 0.5 );
			const box_max = vec3( 0.5 );

			const inv_dir = dir.reciprocal();

			const tmin_tmp = box_min.sub( orig ).mul( inv_dir );
			const tmax_tmp = box_max.sub( orig ).mul( inv_dir );

			const tmin = min$1( tmin_tmp, tmax_tmp );
			const tmax = max$1( tmin_tmp, tmax_tmp );

			const t0 = max$1( tmin.x, max$1( tmin.y, tmin.z ) );
			const t1 = min$1( tmax.x, min$1( tmax.y, tmax.z ) );

			return vec2( t0, t1 );

		} );

		this.fragmentNode = tslFn( () => {

			const vOrigin = varying( vec3( modelWorldMatrixInverse.mul( vec4( cameraPosition, 1.0 ) ) ) );
			const vDirection = varying( positionGeometry.sub( vOrigin ) );

			const rayDir = vDirection.normalize();
			const bounds = property( 'vec2', 'bounds' ).assign( hitBox( { orig: vOrigin, dir: rayDir } ) );

			bounds.x.greaterThan( bounds.y ).discard();

			bounds.assign( vec2( max$1( bounds.x, 0.0 ), bounds.y ) );

			const p = property( 'vec3', 'p' ).assign( vOrigin.add( bounds.x.mul( rayDir ) ) );
			const inc = property( 'vec3', 'inc' ).assign( vec3( rayDir.abs().reciprocal() ) );
			const delta = property( 'float', 'delta' ).assign( min$1( inc.x, min$1( inc.y, inc.z ) ) );

			delta.divAssign( materialReference( 'steps', 'float' ) );

			const ac = property( 'vec4', 'ac' ).assign( vec4( materialReference( 'base', 'color' ), 0.0 ) );

			loop( { type: 'float', start: bounds.x, end: bounds.y, update: '+= delta' }, () => {

				const d = property( 'float', 'd' ).assign( map.uv( p.add( 0.5 ) ).r );

				if ( this.testNode !== null ) {

					this.testNode( { map: map, mapValue: d, probe: p, finalColor: ac } ).append();

				} else {

					// default to show surface of mesh
					ac.a.assign( 1 );
					Break();

				}

				p.addAssign( rayDir.mul( delta ) );

			} );

			ac.a.equal( 0 ).discard();

			return vec4( ac );

		} )();

		super.setup( builder );

	}

}

addNodeMaterial( 'VolumeNodeMaterial', VolumeNodeMaterial );

const superFromTypeFunction = MaterialLoader.createMaterialFromType;

MaterialLoader.createMaterialFromType = function ( type ) {

	const material = createNodeMaterialFromType( type );

	if ( material !== undefined ) {

		return material;

	}

	return superFromTypeFunction.call( this, type );

};

class NodeMaterialLoader extends MaterialLoader {

	constructor( manager ) {

		super( manager );

		this.nodes = {};

	}

	parse( json ) {

		const material = super.parse( json );

		const nodes = this.nodes;
		const inputNodes = json.inputNodes;

		for ( const property in inputNodes ) {

			const uuid = inputNodes[ property ];

			material[ property ] = nodes[ uuid ];

		}

		return material;

	}

	setNodes( value ) {

		this.nodes = value;

		return this;

	}

}

class NodeObjectLoader extends ObjectLoader {

	constructor( manager ) {

		super( manager );

		this._nodesJSON = null;

	}

	parse( json, onLoad ) {

		this._nodesJSON = json.nodes;

		const data = super.parse( json, onLoad );

		this._nodesJSON = null; // dispose

		return data;

	}

	parseNodes( json, textures ) {

		if ( json !== undefined ) {

			const loader = new NodeLoader();
			loader.setTextures( textures );

			return loader.parseNodes( json );

		}

		return {};

	}

	parseMaterials( json, textures ) {

		const materials = {};

		if ( json !== undefined ) {

			const nodes = this.parseNodes( this._nodesJSON, textures );

			const loader = new NodeMaterialLoader();
			loader.setTextures( textures );
			loader.setNodes( nodes );

			for ( let i = 0, l = json.length; i < l; i ++ ) {

				const data = json[ i ];

				materials[ data.uuid ] = loader.parse( data );

			}

		}

		return materials;

	}

}

class NodeParser {

	parseFunction( /*source*/ ) {

		console.warn( 'Abstract function.' );

	}

}

class NodeFunction {

	constructor( type, inputs, name = '', precision = '' ) {

		this.type = type;
		this.inputs = inputs;
		this.name = name;
		this.precision = precision;

	}

	getCode( /*name = this.name*/ ) {

		console.warn( 'Abstract function.' );

	}

}

NodeFunction.isNodeFunction = true;

const declarationRegexp$1 = /^\s*(highp|mediump|lowp)?\s*([a-z_0-9]+)\s*([a-z_0-9]+)?\s*\(([\s\S]*?)\)/i;
const propertiesRegexp$1 = /[a-z_0-9]+/ig;

const pragmaMain = '#pragma main';

const parse$1 = ( source ) => {

	source = source.trim();

	const pragmaMainIndex = source.indexOf( pragmaMain );

	const mainCode = pragmaMainIndex !== - 1 ? source.slice( pragmaMainIndex + pragmaMain.length ) : source;

	const declaration = mainCode.match( declarationRegexp$1 );

	if ( declaration !== null && declaration.length === 5 ) {

		// tokenizer

		const inputsCode = declaration[ 4 ];
		const propsMatches = [];

		let nameMatch = null;

		while ( ( nameMatch = propertiesRegexp$1.exec( inputsCode ) ) !== null ) {

			propsMatches.push( nameMatch );

		}

		// parser

		const inputs = [];

		let i = 0;

		while ( i < propsMatches.length ) {

			const isConst = propsMatches[ i ][ 0 ] === 'const';

			if ( isConst === true ) {

				i ++;

			}

			let qualifier = propsMatches[ i ][ 0 ];

			if ( qualifier === 'in' || qualifier === 'out' || qualifier === 'inout' ) {

				i ++;

			} else {

				qualifier = '';

			}

			const type = propsMatches[ i ++ ][ 0 ];

			let count = Number.parseInt( propsMatches[ i ][ 0 ] );

			if ( Number.isNaN( count ) === false ) i ++;
			else count = null;

			const name = propsMatches[ i ++ ][ 0 ];

			inputs.push( new NodeFunctionInput( type, name, count, qualifier, isConst ) );

		}

		//

		const blockCode = mainCode.substring( declaration[ 0 ].length );

		const name = declaration[ 3 ] !== undefined ? declaration[ 3 ] : '';
		const type = declaration[ 2 ];

		const precision = declaration[ 1 ] !== undefined ? declaration[ 1 ] : '';

		const headerCode = pragmaMainIndex !== - 1 ? source.slice( 0, pragmaMainIndex ) : '';

		return {
			type,
			inputs,
			name,
			precision,
			inputsCode,
			blockCode,
			headerCode
		};

	} else {

		throw new Error( 'FunctionNode: Function is not a GLSL code.' );

	}

};

class GLSLNodeFunction extends NodeFunction {

	constructor( source ) {

		const { type, inputs, name, precision, inputsCode, blockCode, headerCode } = parse$1( source );

		super( type, inputs, name, precision );

		this.inputsCode = inputsCode;
		this.blockCode = blockCode;
		this.headerCode = headerCode;

	}

	getCode( name = this.name ) {

		let code;

		const blockCode = this.blockCode;

		if ( blockCode !== '' ) {

			const { type, inputsCode, headerCode, precision } = this;

			let declarationCode = `${ type } ${ name } ( ${ inputsCode.trim() } )`;

			if ( precision !== '' ) {

				declarationCode = `${ precision } ${ declarationCode }`;

			}

			code = headerCode + declarationCode + blockCode;

		} else {

			// interface function

			code = '';

		}

		return code;

	}

}

class GLSLNodeParser extends NodeParser {

	parseFunction( source ) {

		return new GLSLNodeFunction( source );

	}

}

// Three.js Transpiler
// https://raw.githubusercontent.com/AcademySoftwareFoundation/MaterialX/main/libraries/stdlib/genglsl/lib/mx_noise.glsl



const mx_select = /*#__PURE__*/ tslFn( ( [ b_immutable, t_immutable, f_immutable ] ) => {

	const f = float( f_immutable ).toVar();
	const t = float( t_immutable ).toVar();
	const b = bool( b_immutable ).toVar();

	return cond( b, t, f );

} ).setLayout( {
	name: 'mx_select',
	type: 'float',
	inputs: [
		{ name: 'b', type: 'bool' },
		{ name: 't', type: 'float' },
		{ name: 'f', type: 'float' }
	]
} );

const mx_negate_if = /*#__PURE__*/ tslFn( ( [ val_immutable, b_immutable ] ) => {

	const b = bool( b_immutable ).toVar();
	const val = float( val_immutable ).toVar();

	return cond( b, val.negate(), val );

} ).setLayout( {
	name: 'mx_negate_if',
	type: 'float',
	inputs: [
		{ name: 'val', type: 'float' },
		{ name: 'b', type: 'bool' }
	]
} );

const mx_floor = /*#__PURE__*/ tslFn( ( [ x_immutable ] ) => {

	const x = float( x_immutable ).toVar();

	return int( floor( x ) );

} ).setLayout( {
	name: 'mx_floor',
	type: 'int',
	inputs: [
		{ name: 'x', type: 'float' }
	]
} );

const mx_floorfrac = /*#__PURE__*/ tslFn( ( [ x_immutable, i ] ) => {

	const x = float( x_immutable ).toVar();
	i.assign( mx_floor( x ) );

	return x.sub( float( i ) );

} );

const mx_bilerp_0 = /*#__PURE__*/ tslFn( ( [ v0_immutable, v1_immutable, v2_immutable, v3_immutable, s_immutable, t_immutable ] ) => {

	const t = float( t_immutable ).toVar();
	const s = float( s_immutable ).toVar();
	const v3 = float( v3_immutable ).toVar();
	const v2 = float( v2_immutable ).toVar();
	const v1 = float( v1_immutable ).toVar();
	const v0 = float( v0_immutable ).toVar();
	const s1 = float( sub( 1.0, s ) ).toVar();

	return sub( 1.0, t ).mul( v0.mul( s1 ).add( v1.mul( s ) ) ).add( t.mul( v2.mul( s1 ).add( v3.mul( s ) ) ) );

} ).setLayout( {
	name: 'mx_bilerp_0',
	type: 'float',
	inputs: [
		{ name: 'v0', type: 'float' },
		{ name: 'v1', type: 'float' },
		{ name: 'v2', type: 'float' },
		{ name: 'v3', type: 'float' },
		{ name: 's', type: 'float' },
		{ name: 't', type: 'float' }
	]
} );

const mx_bilerp_1 = /*#__PURE__*/ tslFn( ( [ v0_immutable, v1_immutable, v2_immutable, v3_immutable, s_immutable, t_immutable ] ) => {

	const t = float( t_immutable ).toVar();
	const s = float( s_immutable ).toVar();
	const v3 = vec3( v3_immutable ).toVar();
	const v2 = vec3( v2_immutable ).toVar();
	const v1 = vec3( v1_immutable ).toVar();
	const v0 = vec3( v0_immutable ).toVar();
	const s1 = float( sub( 1.0, s ) ).toVar();

	return sub( 1.0, t ).mul( v0.mul( s1 ).add( v1.mul( s ) ) ).add( t.mul( v2.mul( s1 ).add( v3.mul( s ) ) ) );

} ).setLayout( {
	name: 'mx_bilerp_1',
	type: 'vec3',
	inputs: [
		{ name: 'v0', type: 'vec3' },
		{ name: 'v1', type: 'vec3' },
		{ name: 'v2', type: 'vec3' },
		{ name: 'v3', type: 'vec3' },
		{ name: 's', type: 'float' },
		{ name: 't', type: 'float' }
	]
} );

const mx_bilerp = /*#__PURE__*/ overloadingFn( [ mx_bilerp_0, mx_bilerp_1 ] );

const mx_trilerp_0 = /*#__PURE__*/ tslFn( ( [ v0_immutable, v1_immutable, v2_immutable, v3_immutable, v4_immutable, v5_immutable, v6_immutable, v7_immutable, s_immutable, t_immutable, r_immutable ] ) => {

	const r = float( r_immutable ).toVar();
	const t = float( t_immutable ).toVar();
	const s = float( s_immutable ).toVar();
	const v7 = float( v7_immutable ).toVar();
	const v6 = float( v6_immutable ).toVar();
	const v5 = float( v5_immutable ).toVar();
	const v4 = float( v4_immutable ).toVar();
	const v3 = float( v3_immutable ).toVar();
	const v2 = float( v2_immutable ).toVar();
	const v1 = float( v1_immutable ).toVar();
	const v0 = float( v0_immutable ).toVar();
	const s1 = float( sub( 1.0, s ) ).toVar();
	const t1 = float( sub( 1.0, t ) ).toVar();
	const r1 = float( sub( 1.0, r ) ).toVar();

	return r1.mul( t1.mul( v0.mul( s1 ).add( v1.mul( s ) ) ).add( t.mul( v2.mul( s1 ).add( v3.mul( s ) ) ) ) ).add( r.mul( t1.mul( v4.mul( s1 ).add( v5.mul( s ) ) ).add( t.mul( v6.mul( s1 ).add( v7.mul( s ) ) ) ) ) );

} ).setLayout( {
	name: 'mx_trilerp_0',
	type: 'float',
	inputs: [
		{ name: 'v0', type: 'float' },
		{ name: 'v1', type: 'float' },
		{ name: 'v2', type: 'float' },
		{ name: 'v3', type: 'float' },
		{ name: 'v4', type: 'float' },
		{ name: 'v5', type: 'float' },
		{ name: 'v6', type: 'float' },
		{ name: 'v7', type: 'float' },
		{ name: 's', type: 'float' },
		{ name: 't', type: 'float' },
		{ name: 'r', type: 'float' }
	]
} );

const mx_trilerp_1 = /*#__PURE__*/ tslFn( ( [ v0_immutable, v1_immutable, v2_immutable, v3_immutable, v4_immutable, v5_immutable, v6_immutable, v7_immutable, s_immutable, t_immutable, r_immutable ] ) => {

	const r = float( r_immutable ).toVar();
	const t = float( t_immutable ).toVar();
	const s = float( s_immutable ).toVar();
	const v7 = vec3( v7_immutable ).toVar();
	const v6 = vec3( v6_immutable ).toVar();
	const v5 = vec3( v5_immutable ).toVar();
	const v4 = vec3( v4_immutable ).toVar();
	const v3 = vec3( v3_immutable ).toVar();
	const v2 = vec3( v2_immutable ).toVar();
	const v1 = vec3( v1_immutable ).toVar();
	const v0 = vec3( v0_immutable ).toVar();
	const s1 = float( sub( 1.0, s ) ).toVar();
	const t1 = float( sub( 1.0, t ) ).toVar();
	const r1 = float( sub( 1.0, r ) ).toVar();

	return r1.mul( t1.mul( v0.mul( s1 ).add( v1.mul( s ) ) ).add( t.mul( v2.mul( s1 ).add( v3.mul( s ) ) ) ) ).add( r.mul( t1.mul( v4.mul( s1 ).add( v5.mul( s ) ) ).add( t.mul( v6.mul( s1 ).add( v7.mul( s ) ) ) ) ) );

} ).setLayout( {
	name: 'mx_trilerp_1',
	type: 'vec3',
	inputs: [
		{ name: 'v0', type: 'vec3' },
		{ name: 'v1', type: 'vec3' },
		{ name: 'v2', type: 'vec3' },
		{ name: 'v3', type: 'vec3' },
		{ name: 'v4', type: 'vec3' },
		{ name: 'v5', type: 'vec3' },
		{ name: 'v6', type: 'vec3' },
		{ name: 'v7', type: 'vec3' },
		{ name: 's', type: 'float' },
		{ name: 't', type: 'float' },
		{ name: 'r', type: 'float' }
	]
} );

const mx_trilerp = /*#__PURE__*/ overloadingFn( [ mx_trilerp_0, mx_trilerp_1 ] );

const mx_gradient_float_0 = /*#__PURE__*/ tslFn( ( [ hash_immutable, x_immutable, y_immutable ] ) => {

	const y = float( y_immutable ).toVar();
	const x = float( x_immutable ).toVar();
	const hash = uint( hash_immutable ).toVar();
	const h = uint( hash.bitAnd( uint( 7 ) ) ).toVar();
	const u = float( mx_select( h.lessThan( uint( 4 ) ), x, y ) ).toVar();
	const v = float( mul( 2.0, mx_select( h.lessThan( uint( 4 ) ), y, x ) ) ).toVar();

	return mx_negate_if( u, bool( h.bitAnd( uint( 1 ) ) ) ).add( mx_negate_if( v, bool( h.bitAnd( uint( 2 ) ) ) ) );

} ).setLayout( {
	name: 'mx_gradient_float_0',
	type: 'float',
	inputs: [
		{ name: 'hash', type: 'uint' },
		{ name: 'x', type: 'float' },
		{ name: 'y', type: 'float' }
	]
} );

const mx_gradient_float_1 = /*#__PURE__*/ tslFn( ( [ hash_immutable, x_immutable, y_immutable, z_immutable ] ) => {

	const z = float( z_immutable ).toVar();
	const y = float( y_immutable ).toVar();
	const x = float( x_immutable ).toVar();
	const hash = uint( hash_immutable ).toVar();
	const h = uint( hash.bitAnd( uint( 15 ) ) ).toVar();
	const u = float( mx_select( h.lessThan( uint( 8 ) ), x, y ) ).toVar();
	const v = float( mx_select( h.lessThan( uint( 4 ) ), y, mx_select( h.equal( uint( 12 ) ).or( h.equal( uint( 14 ) ) ), x, z ) ) ).toVar();

	return mx_negate_if( u, bool( h.bitAnd( uint( 1 ) ) ) ).add( mx_negate_if( v, bool( h.bitAnd( uint( 2 ) ) ) ) );

} ).setLayout( {
	name: 'mx_gradient_float_1',
	type: 'float',
	inputs: [
		{ name: 'hash', type: 'uint' },
		{ name: 'x', type: 'float' },
		{ name: 'y', type: 'float' },
		{ name: 'z', type: 'float' }
	]
} );

const mx_gradient_float = /*#__PURE__*/ overloadingFn( [ mx_gradient_float_0, mx_gradient_float_1 ] );

const mx_gradient_vec3_0 = /*#__PURE__*/ tslFn( ( [ hash_immutable, x_immutable, y_immutable ] ) => {

	const y = float( y_immutable ).toVar();
	const x = float( x_immutable ).toVar();
	const hash = uvec3( hash_immutable ).toVar();

	return vec3( mx_gradient_float( hash.x, x, y ), mx_gradient_float( hash.y, x, y ), mx_gradient_float( hash.z, x, y ) );

} ).setLayout( {
	name: 'mx_gradient_vec3_0',
	type: 'vec3',
	inputs: [
		{ name: 'hash', type: 'uvec3' },
		{ name: 'x', type: 'float' },
		{ name: 'y', type: 'float' }
	]
} );

const mx_gradient_vec3_1 = /*#__PURE__*/ tslFn( ( [ hash_immutable, x_immutable, y_immutable, z_immutable ] ) => {

	const z = float( z_immutable ).toVar();
	const y = float( y_immutable ).toVar();
	const x = float( x_immutable ).toVar();
	const hash = uvec3( hash_immutable ).toVar();

	return vec3( mx_gradient_float( hash.x, x, y, z ), mx_gradient_float( hash.y, x, y, z ), mx_gradient_float( hash.z, x, y, z ) );

} ).setLayout( {
	name: 'mx_gradient_vec3_1',
	type: 'vec3',
	inputs: [
		{ name: 'hash', type: 'uvec3' },
		{ name: 'x', type: 'float' },
		{ name: 'y', type: 'float' },
		{ name: 'z', type: 'float' }
	]
} );

const mx_gradient_vec3 = /*#__PURE__*/ overloadingFn( [ mx_gradient_vec3_0, mx_gradient_vec3_1 ] );

const mx_gradient_scale2d_0 = /*#__PURE__*/ tslFn( ( [ v_immutable ] ) => {

	const v = float( v_immutable ).toVar();

	return mul( 0.6616, v );

} ).setLayout( {
	name: 'mx_gradient_scale2d_0',
	type: 'float',
	inputs: [
		{ name: 'v', type: 'float' }
	]
} );

const mx_gradient_scale3d_0 = /*#__PURE__*/ tslFn( ( [ v_immutable ] ) => {

	const v = float( v_immutable ).toVar();

	return mul( 0.9820, v );

} ).setLayout( {
	name: 'mx_gradient_scale3d_0',
	type: 'float',
	inputs: [
		{ name: 'v', type: 'float' }
	]
} );

const mx_gradient_scale2d_1 = /*#__PURE__*/ tslFn( ( [ v_immutable ] ) => {

	const v = vec3( v_immutable ).toVar();

	return mul( 0.6616, v );

} ).setLayout( {
	name: 'mx_gradient_scale2d_1',
	type: 'vec3',
	inputs: [
		{ name: 'v', type: 'vec3' }
	]
} );

const mx_gradient_scale2d = /*#__PURE__*/ overloadingFn( [ mx_gradient_scale2d_0, mx_gradient_scale2d_1 ] );

const mx_gradient_scale3d_1 = /*#__PURE__*/ tslFn( ( [ v_immutable ] ) => {

	const v = vec3( v_immutable ).toVar();

	return mul( 0.9820, v );

} ).setLayout( {
	name: 'mx_gradient_scale3d_1',
	type: 'vec3',
	inputs: [
		{ name: 'v', type: 'vec3' }
	]
} );

const mx_gradient_scale3d = /*#__PURE__*/ overloadingFn( [ mx_gradient_scale3d_0, mx_gradient_scale3d_1 ] );

const mx_rotl32 = /*#__PURE__*/ tslFn( ( [ x_immutable, k_immutable ] ) => {

	const k = int( k_immutable ).toVar();
	const x = uint( x_immutable ).toVar();

	return x.shiftLeft( k ).bitOr( x.shiftRight( int( 32 ).sub( k ) ) );

} ).setLayout( {
	name: 'mx_rotl32',
	type: 'uint',
	inputs: [
		{ name: 'x', type: 'uint' },
		{ name: 'k', type: 'int' }
	]
} );

const mx_bjmix = /*#__PURE__*/ tslFn( ( [ a, b, c ] ) => {

	a.subAssign( c );
	a.bitXorAssign( mx_rotl32( c, int( 4 ) ) );
	c.addAssign( b );
	b.subAssign( a );
	b.bitXorAssign( mx_rotl32( a, int( 6 ) ) );
	a.addAssign( c );
	c.subAssign( b );
	c.bitXorAssign( mx_rotl32( b, int( 8 ) ) );
	b.addAssign( a );
	a.subAssign( c );
	a.bitXorAssign( mx_rotl32( c, int( 16 ) ) );
	c.addAssign( b );
	b.subAssign( a );
	b.bitXorAssign( mx_rotl32( a, int( 19 ) ) );
	a.addAssign( c );
	c.subAssign( b );
	c.bitXorAssign( mx_rotl32( b, int( 4 ) ) );
	b.addAssign( a );

} );

const mx_bjfinal = /*#__PURE__*/ tslFn( ( [ a_immutable, b_immutable, c_immutable ] ) => {

	const c = uint( c_immutable ).toVar();
	const b = uint( b_immutable ).toVar();
	const a = uint( a_immutable ).toVar();
	c.bitXorAssign( b );
	c.subAssign( mx_rotl32( b, int( 14 ) ) );
	a.bitXorAssign( c );
	a.subAssign( mx_rotl32( c, int( 11 ) ) );
	b.bitXorAssign( a );
	b.subAssign( mx_rotl32( a, int( 25 ) ) );
	c.bitXorAssign( b );
	c.subAssign( mx_rotl32( b, int( 16 ) ) );
	a.bitXorAssign( c );
	a.subAssign( mx_rotl32( c, int( 4 ) ) );
	b.bitXorAssign( a );
	b.subAssign( mx_rotl32( a, int( 14 ) ) );
	c.bitXorAssign( b );
	c.subAssign( mx_rotl32( b, int( 24 ) ) );

	return c;

} ).setLayout( {
	name: 'mx_bjfinal',
	type: 'uint',
	inputs: [
		{ name: 'a', type: 'uint' },
		{ name: 'b', type: 'uint' },
		{ name: 'c', type: 'uint' }
	]
} );

const mx_bits_to_01 = /*#__PURE__*/ tslFn( ( [ bits_immutable ] ) => {

	const bits = uint( bits_immutable ).toVar();

	return float( bits ).div( float( uint( int( 0xffffffff ) ) ) );

} ).setLayout( {
	name: 'mx_bits_to_01',
	type: 'float',
	inputs: [
		{ name: 'bits', type: 'uint' }
	]
} );

const mx_fade = /*#__PURE__*/ tslFn( ( [ t_immutable ] ) => {

	const t = float( t_immutable ).toVar();

	return t.mul( t ).mul( t ).mul( t.mul( t.mul( 6.0 ).sub( 15.0 ) ).add( 10.0 ) );

} ).setLayout( {
	name: 'mx_fade',
	type: 'float',
	inputs: [
		{ name: 't', type: 'float' }
	]
} );

const mx_hash_int_0 = /*#__PURE__*/ tslFn( ( [ x_immutable ] ) => {

	const x = int( x_immutable ).toVar();
	const len = uint( uint( 1 ) ).toVar();
	const seed = uint( uint( int( 0xdeadbeef ) ).add( len.shiftLeft( uint( 2 ) ) ).add( uint( 13 ) ) ).toVar();

	return mx_bjfinal( seed.add( uint( x ) ), seed, seed );

} ).setLayout( {
	name: 'mx_hash_int_0',
	type: 'uint',
	inputs: [
		{ name: 'x', type: 'int' }
	]
} );

const mx_hash_int_1 = /*#__PURE__*/ tslFn( ( [ x_immutable, y_immutable ] ) => {

	const y = int( y_immutable ).toVar();
	const x = int( x_immutable ).toVar();
	const len = uint( uint( 2 ) ).toVar();
	const a = uint().toVar(), b = uint().toVar(), c = uint().toVar();
	a.assign( b.assign( c.assign( uint( int( 0xdeadbeef ) ).add( len.shiftLeft( uint( 2 ) ) ).add( uint( 13 ) ) ) ) );
	a.addAssign( uint( x ) );
	b.addAssign( uint( y ) );

	return mx_bjfinal( a, b, c );

} ).setLayout( {
	name: 'mx_hash_int_1',
	type: 'uint',
	inputs: [
		{ name: 'x', type: 'int' },
		{ name: 'y', type: 'int' }
	]
} );

const mx_hash_int_2 = /*#__PURE__*/ tslFn( ( [ x_immutable, y_immutable, z_immutable ] ) => {

	const z = int( z_immutable ).toVar();
	const y = int( y_immutable ).toVar();
	const x = int( x_immutable ).toVar();
	const len = uint( uint( 3 ) ).toVar();
	const a = uint().toVar(), b = uint().toVar(), c = uint().toVar();
	a.assign( b.assign( c.assign( uint( int( 0xdeadbeef ) ).add( len.shiftLeft( uint( 2 ) ) ).add( uint( 13 ) ) ) ) );
	a.addAssign( uint( x ) );
	b.addAssign( uint( y ) );
	c.addAssign( uint( z ) );

	return mx_bjfinal( a, b, c );

} ).setLayout( {
	name: 'mx_hash_int_2',
	type: 'uint',
	inputs: [
		{ name: 'x', type: 'int' },
		{ name: 'y', type: 'int' },
		{ name: 'z', type: 'int' }
	]
} );

const mx_hash_int_3 = /*#__PURE__*/ tslFn( ( [ x_immutable, y_immutable, z_immutable, xx_immutable ] ) => {

	const xx = int( xx_immutable ).toVar();
	const z = int( z_immutable ).toVar();
	const y = int( y_immutable ).toVar();
	const x = int( x_immutable ).toVar();
	const len = uint( uint( 4 ) ).toVar();
	const a = uint().toVar(), b = uint().toVar(), c = uint().toVar();
	a.assign( b.assign( c.assign( uint( int( 0xdeadbeef ) ).add( len.shiftLeft( uint( 2 ) ) ).add( uint( 13 ) ) ) ) );
	a.addAssign( uint( x ) );
	b.addAssign( uint( y ) );
	c.addAssign( uint( z ) );
	mx_bjmix( a, b, c );
	a.addAssign( uint( xx ) );

	return mx_bjfinal( a, b, c );

} ).setLayout( {
	name: 'mx_hash_int_3',
	type: 'uint',
	inputs: [
		{ name: 'x', type: 'int' },
		{ name: 'y', type: 'int' },
		{ name: 'z', type: 'int' },
		{ name: 'xx', type: 'int' }
	]
} );

const mx_hash_int_4 = /*#__PURE__*/ tslFn( ( [ x_immutable, y_immutable, z_immutable, xx_immutable, yy_immutable ] ) => {

	const yy = int( yy_immutable ).toVar();
	const xx = int( xx_immutable ).toVar();
	const z = int( z_immutable ).toVar();
	const y = int( y_immutable ).toVar();
	const x = int( x_immutable ).toVar();
	const len = uint( uint( 5 ) ).toVar();
	const a = uint().toVar(), b = uint().toVar(), c = uint().toVar();
	a.assign( b.assign( c.assign( uint( int( 0xdeadbeef ) ).add( len.shiftLeft( uint( 2 ) ) ).add( uint( 13 ) ) ) ) );
	a.addAssign( uint( x ) );
	b.addAssign( uint( y ) );
	c.addAssign( uint( z ) );
	mx_bjmix( a, b, c );
	a.addAssign( uint( xx ) );
	b.addAssign( uint( yy ) );

	return mx_bjfinal( a, b, c );

} ).setLayout( {
	name: 'mx_hash_int_4',
	type: 'uint',
	inputs: [
		{ name: 'x', type: 'int' },
		{ name: 'y', type: 'int' },
		{ name: 'z', type: 'int' },
		{ name: 'xx', type: 'int' },
		{ name: 'yy', type: 'int' }
	]
} );

const mx_hash_int = /*#__PURE__*/ overloadingFn( [ mx_hash_int_0, mx_hash_int_1, mx_hash_int_2, mx_hash_int_3, mx_hash_int_4 ] );

const mx_hash_vec3_0 = /*#__PURE__*/ tslFn( ( [ x_immutable, y_immutable ] ) => {

	const y = int( y_immutable ).toVar();
	const x = int( x_immutable ).toVar();
	const h = uint( mx_hash_int( x, y ) ).toVar();
	const result = uvec3().toVar();
	result.x.assign( h.bitAnd( int( 0xFF ) ) );
	result.y.assign( h.shiftRight( int( 8 ) ).bitAnd( int( 0xFF ) ) );
	result.z.assign( h.shiftRight( int( 16 ) ).bitAnd( int( 0xFF ) ) );

	return result;

} ).setLayout( {
	name: 'mx_hash_vec3_0',
	type: 'uvec3',
	inputs: [
		{ name: 'x', type: 'int' },
		{ name: 'y', type: 'int' }
	]
} );

const mx_hash_vec3_1 = /*#__PURE__*/ tslFn( ( [ x_immutable, y_immutable, z_immutable ] ) => {

	const z = int( z_immutable ).toVar();
	const y = int( y_immutable ).toVar();
	const x = int( x_immutable ).toVar();
	const h = uint( mx_hash_int( x, y, z ) ).toVar();
	const result = uvec3().toVar();
	result.x.assign( h.bitAnd( int( 0xFF ) ) );
	result.y.assign( h.shiftRight( int( 8 ) ).bitAnd( int( 0xFF ) ) );
	result.z.assign( h.shiftRight( int( 16 ) ).bitAnd( int( 0xFF ) ) );

	return result;

} ).setLayout( {
	name: 'mx_hash_vec3_1',
	type: 'uvec3',
	inputs: [
		{ name: 'x', type: 'int' },
		{ name: 'y', type: 'int' },
		{ name: 'z', type: 'int' }
	]
} );

const mx_hash_vec3 = /*#__PURE__*/ overloadingFn( [ mx_hash_vec3_0, mx_hash_vec3_1 ] );

const mx_perlin_noise_float_0 = /*#__PURE__*/ tslFn( ( [ p_immutable ] ) => {

	const p = vec2( p_immutable ).toVar();
	const X = int().toVar(), Y = int().toVar();
	const fx = float( mx_floorfrac( p.x, X ) ).toVar();
	const fy = float( mx_floorfrac( p.y, Y ) ).toVar();
	const u = float( mx_fade( fx ) ).toVar();
	const v = float( mx_fade( fy ) ).toVar();
	const result = float( mx_bilerp( mx_gradient_float( mx_hash_int( X, Y ), fx, fy ), mx_gradient_float( mx_hash_int( X.add( int( 1 ) ), Y ), fx.sub( 1.0 ), fy ), mx_gradient_float( mx_hash_int( X, Y.add( int( 1 ) ) ), fx, fy.sub( 1.0 ) ), mx_gradient_float( mx_hash_int( X.add( int( 1 ) ), Y.add( int( 1 ) ) ), fx.sub( 1.0 ), fy.sub( 1.0 ) ), u, v ) ).toVar();

	return mx_gradient_scale2d( result );

} ).setLayout( {
	name: 'mx_perlin_noise_float_0',
	type: 'float',
	inputs: [
		{ name: 'p', type: 'vec2' }
	]
} );

const mx_perlin_noise_float_1 = /*#__PURE__*/ tslFn( ( [ p_immutable ] ) => {

	const p = vec3( p_immutable ).toVar();
	const X = int().toVar(), Y = int().toVar(), Z = int().toVar();
	const fx = float( mx_floorfrac( p.x, X ) ).toVar();
	const fy = float( mx_floorfrac( p.y, Y ) ).toVar();
	const fz = float( mx_floorfrac( p.z, Z ) ).toVar();
	const u = float( mx_fade( fx ) ).toVar();
	const v = float( mx_fade( fy ) ).toVar();
	const w = float( mx_fade( fz ) ).toVar();
	const result = float( mx_trilerp( mx_gradient_float( mx_hash_int( X, Y, Z ), fx, fy, fz ), mx_gradient_float( mx_hash_int( X.add( int( 1 ) ), Y, Z ), fx.sub( 1.0 ), fy, fz ), mx_gradient_float( mx_hash_int( X, Y.add( int( 1 ) ), Z ), fx, fy.sub( 1.0 ), fz ), mx_gradient_float( mx_hash_int( X.add( int( 1 ) ), Y.add( int( 1 ) ), Z ), fx.sub( 1.0 ), fy.sub( 1.0 ), fz ), mx_gradient_float( mx_hash_int( X, Y, Z.add( int( 1 ) ) ), fx, fy, fz.sub( 1.0 ) ), mx_gradient_float( mx_hash_int( X.add( int( 1 ) ), Y, Z.add( int( 1 ) ) ), fx.sub( 1.0 ), fy, fz.sub( 1.0 ) ), mx_gradient_float( mx_hash_int( X, Y.add( int( 1 ) ), Z.add( int( 1 ) ) ), fx, fy.sub( 1.0 ), fz.sub( 1.0 ) ), mx_gradient_float( mx_hash_int( X.add( int( 1 ) ), Y.add( int( 1 ) ), Z.add( int( 1 ) ) ), fx.sub( 1.0 ), fy.sub( 1.0 ), fz.sub( 1.0 ) ), u, v, w ) ).toVar();

	return mx_gradient_scale3d( result );

} ).setLayout( {
	name: 'mx_perlin_noise_float_1',
	type: 'float',
	inputs: [
		{ name: 'p', type: 'vec3' }
	]
} );

const mx_perlin_noise_float = /*#__PURE__*/ overloadingFn( [ mx_perlin_noise_float_0, mx_perlin_noise_float_1 ] );

const mx_perlin_noise_vec3_0 = /*#__PURE__*/ tslFn( ( [ p_immutable ] ) => {

	const p = vec2( p_immutable ).toVar();
	const X = int().toVar(), Y = int().toVar();
	const fx = float( mx_floorfrac( p.x, X ) ).toVar();
	const fy = float( mx_floorfrac( p.y, Y ) ).toVar();
	const u = float( mx_fade( fx ) ).toVar();
	const v = float( mx_fade( fy ) ).toVar();
	const result = vec3( mx_bilerp( mx_gradient_vec3( mx_hash_vec3( X, Y ), fx, fy ), mx_gradient_vec3( mx_hash_vec3( X.add( int( 1 ) ), Y ), fx.sub( 1.0 ), fy ), mx_gradient_vec3( mx_hash_vec3( X, Y.add( int( 1 ) ) ), fx, fy.sub( 1.0 ) ), mx_gradient_vec3( mx_hash_vec3( X.add( int( 1 ) ), Y.add( int( 1 ) ) ), fx.sub( 1.0 ), fy.sub( 1.0 ) ), u, v ) ).toVar();

	return mx_gradient_scale2d( result );

} ).setLayout( {
	name: 'mx_perlin_noise_vec3_0',
	type: 'vec3',
	inputs: [
		{ name: 'p', type: 'vec2' }
	]
} );

const mx_perlin_noise_vec3_1 = /*#__PURE__*/ tslFn( ( [ p_immutable ] ) => {

	const p = vec3( p_immutable ).toVar();
	const X = int().toVar(), Y = int().toVar(), Z = int().toVar();
	const fx = float( mx_floorfrac( p.x, X ) ).toVar();
	const fy = float( mx_floorfrac( p.y, Y ) ).toVar();
	const fz = float( mx_floorfrac( p.z, Z ) ).toVar();
	const u = float( mx_fade( fx ) ).toVar();
	const v = float( mx_fade( fy ) ).toVar();
	const w = float( mx_fade( fz ) ).toVar();
	const result = vec3( mx_trilerp( mx_gradient_vec3( mx_hash_vec3( X, Y, Z ), fx, fy, fz ), mx_gradient_vec3( mx_hash_vec3( X.add( int( 1 ) ), Y, Z ), fx.sub( 1.0 ), fy, fz ), mx_gradient_vec3( mx_hash_vec3( X, Y.add( int( 1 ) ), Z ), fx, fy.sub( 1.0 ), fz ), mx_gradient_vec3( mx_hash_vec3( X.add( int( 1 ) ), Y.add( int( 1 ) ), Z ), fx.sub( 1.0 ), fy.sub( 1.0 ), fz ), mx_gradient_vec3( mx_hash_vec3( X, Y, Z.add( int( 1 ) ) ), fx, fy, fz.sub( 1.0 ) ), mx_gradient_vec3( mx_hash_vec3( X.add( int( 1 ) ), Y, Z.add( int( 1 ) ) ), fx.sub( 1.0 ), fy, fz.sub( 1.0 ) ), mx_gradient_vec3( mx_hash_vec3( X, Y.add( int( 1 ) ), Z.add( int( 1 ) ) ), fx, fy.sub( 1.0 ), fz.sub( 1.0 ) ), mx_gradient_vec3( mx_hash_vec3( X.add( int( 1 ) ), Y.add( int( 1 ) ), Z.add( int( 1 ) ) ), fx.sub( 1.0 ), fy.sub( 1.0 ), fz.sub( 1.0 ) ), u, v, w ) ).toVar();

	return mx_gradient_scale3d( result );

} ).setLayout( {
	name: 'mx_perlin_noise_vec3_1',
	type: 'vec3',
	inputs: [
		{ name: 'p', type: 'vec3' }
	]
} );

const mx_perlin_noise_vec3 = /*#__PURE__*/ overloadingFn( [ mx_perlin_noise_vec3_0, mx_perlin_noise_vec3_1 ] );

const mx_cell_noise_float_0 = /*#__PURE__*/ tslFn( ( [ p_immutable ] ) => {

	const p = float( p_immutable ).toVar();
	const ix = int( mx_floor( p ) ).toVar();

	return mx_bits_to_01( mx_hash_int( ix ) );

} ).setLayout( {
	name: 'mx_cell_noise_float_0',
	type: 'float',
	inputs: [
		{ name: 'p', type: 'float' }
	]
} );

const mx_cell_noise_float_1 = /*#__PURE__*/ tslFn( ( [ p_immutable ] ) => {

	const p = vec2( p_immutable ).toVar();
	const ix = int( mx_floor( p.x ) ).toVar();
	const iy = int( mx_floor( p.y ) ).toVar();

	return mx_bits_to_01( mx_hash_int( ix, iy ) );

} ).setLayout( {
	name: 'mx_cell_noise_float_1',
	type: 'float',
	inputs: [
		{ name: 'p', type: 'vec2' }
	]
} );

const mx_cell_noise_float_2 = /*#__PURE__*/ tslFn( ( [ p_immutable ] ) => {

	const p = vec3( p_immutable ).toVar();
	const ix = int( mx_floor( p.x ) ).toVar();
	const iy = int( mx_floor( p.y ) ).toVar();
	const iz = int( mx_floor( p.z ) ).toVar();

	return mx_bits_to_01( mx_hash_int( ix, iy, iz ) );

} ).setLayout( {
	name: 'mx_cell_noise_float_2',
	type: 'float',
	inputs: [
		{ name: 'p', type: 'vec3' }
	]
} );

const mx_cell_noise_float_3 = /*#__PURE__*/ tslFn( ( [ p_immutable ] ) => {

	const p = vec4( p_immutable ).toVar();
	const ix = int( mx_floor( p.x ) ).toVar();
	const iy = int( mx_floor( p.y ) ).toVar();
	const iz = int( mx_floor( p.z ) ).toVar();
	const iw = int( mx_floor( p.w ) ).toVar();

	return mx_bits_to_01( mx_hash_int( ix, iy, iz, iw ) );

} ).setLayout( {
	name: 'mx_cell_noise_float_3',
	type: 'float',
	inputs: [
		{ name: 'p', type: 'vec4' }
	]
} );

const mx_cell_noise_float$1 = /*#__PURE__*/ overloadingFn( [ mx_cell_noise_float_0, mx_cell_noise_float_1, mx_cell_noise_float_2, mx_cell_noise_float_3 ] );

const mx_cell_noise_vec3_0 = /*#__PURE__*/ tslFn( ( [ p_immutable ] ) => {

	const p = float( p_immutable ).toVar();
	const ix = int( mx_floor( p ) ).toVar();

	return vec3( mx_bits_to_01( mx_hash_int( ix, int( 0 ) ) ), mx_bits_to_01( mx_hash_int( ix, int( 1 ) ) ), mx_bits_to_01( mx_hash_int( ix, int( 2 ) ) ) );

} ).setLayout( {
	name: 'mx_cell_noise_vec3_0',
	type: 'vec3',
	inputs: [
		{ name: 'p', type: 'float' }
	]
} );

const mx_cell_noise_vec3_1 = /*#__PURE__*/ tslFn( ( [ p_immutable ] ) => {

	const p = vec2( p_immutable ).toVar();
	const ix = int( mx_floor( p.x ) ).toVar();
	const iy = int( mx_floor( p.y ) ).toVar();

	return vec3( mx_bits_to_01( mx_hash_int( ix, iy, int( 0 ) ) ), mx_bits_to_01( mx_hash_int( ix, iy, int( 1 ) ) ), mx_bits_to_01( mx_hash_int( ix, iy, int( 2 ) ) ) );

} ).setLayout( {
	name: 'mx_cell_noise_vec3_1',
	type: 'vec3',
	inputs: [
		{ name: 'p', type: 'vec2' }
	]
} );

const mx_cell_noise_vec3_2 = /*#__PURE__*/ tslFn( ( [ p_immutable ] ) => {

	const p = vec3( p_immutable ).toVar();
	const ix = int( mx_floor( p.x ) ).toVar();
	const iy = int( mx_floor( p.y ) ).toVar();
	const iz = int( mx_floor( p.z ) ).toVar();

	return vec3( mx_bits_to_01( mx_hash_int( ix, iy, iz, int( 0 ) ) ), mx_bits_to_01( mx_hash_int( ix, iy, iz, int( 1 ) ) ), mx_bits_to_01( mx_hash_int( ix, iy, iz, int( 2 ) ) ) );

} ).setLayout( {
	name: 'mx_cell_noise_vec3_2',
	type: 'vec3',
	inputs: [
		{ name: 'p', type: 'vec3' }
	]
} );

const mx_cell_noise_vec3_3 = /*#__PURE__*/ tslFn( ( [ p_immutable ] ) => {

	const p = vec4( p_immutable ).toVar();
	const ix = int( mx_floor( p.x ) ).toVar();
	const iy = int( mx_floor( p.y ) ).toVar();
	const iz = int( mx_floor( p.z ) ).toVar();
	const iw = int( mx_floor( p.w ) ).toVar();

	return vec3( mx_bits_to_01( mx_hash_int( ix, iy, iz, iw, int( 0 ) ) ), mx_bits_to_01( mx_hash_int( ix, iy, iz, iw, int( 1 ) ) ), mx_bits_to_01( mx_hash_int( ix, iy, iz, iw, int( 2 ) ) ) );

} ).setLayout( {
	name: 'mx_cell_noise_vec3_3',
	type: 'vec3',
	inputs: [
		{ name: 'p', type: 'vec4' }
	]
} );

const mx_cell_noise_vec3 = /*#__PURE__*/ overloadingFn( [ mx_cell_noise_vec3_0, mx_cell_noise_vec3_1, mx_cell_noise_vec3_2, mx_cell_noise_vec3_3 ] );

const mx_fractal_noise_float$1 = /*#__PURE__*/ tslFn( ( [ p_immutable, octaves_immutable, lacunarity_immutable, diminish_immutable ] ) => {

	const diminish = float( diminish_immutable ).toVar();
	const lacunarity = float( lacunarity_immutable ).toVar();
	const octaves = int( octaves_immutable ).toVar();
	const p = vec3( p_immutable ).toVar();
	const result = float( 0.0 ).toVar();
	const amplitude = float( 1.0 ).toVar();

	loop( octaves, () => {

		result.addAssign( amplitude.mul( mx_perlin_noise_float( p ) ) );
		amplitude.mulAssign( diminish );
		p.mulAssign( lacunarity );

	} );

	return result;

} ).setLayout( {
	name: 'mx_fractal_noise_float',
	type: 'float',
	inputs: [
		{ name: 'p', type: 'vec3' },
		{ name: 'octaves', type: 'int' },
		{ name: 'lacunarity', type: 'float' },
		{ name: 'diminish', type: 'float' }
	]
} );

const mx_fractal_noise_vec3$1 = /*#__PURE__*/ tslFn( ( [ p_immutable, octaves_immutable, lacunarity_immutable, diminish_immutable ] ) => {

	const diminish = float( diminish_immutable ).toVar();
	const lacunarity = float( lacunarity_immutable ).toVar();
	const octaves = int( octaves_immutable ).toVar();
	const p = vec3( p_immutable ).toVar();
	const result = vec3( 0.0 ).toVar();
	const amplitude = float( 1.0 ).toVar();

	loop( octaves, () => {

		result.addAssign( amplitude.mul( mx_perlin_noise_vec3( p ) ) );
		amplitude.mulAssign( diminish );
		p.mulAssign( lacunarity );

	} );

	return result;

} ).setLayout( {
	name: 'mx_fractal_noise_vec3',
	type: 'vec3',
	inputs: [
		{ name: 'p', type: 'vec3' },
		{ name: 'octaves', type: 'int' },
		{ name: 'lacunarity', type: 'float' },
		{ name: 'diminish', type: 'float' }
	]
} );

const mx_fractal_noise_vec2$1 = /*#__PURE__*/ tslFn( ( [ p_immutable, octaves_immutable, lacunarity_immutable, diminish_immutable ] ) => {

	const diminish = float( diminish_immutable ).toVar();
	const lacunarity = float( lacunarity_immutable ).toVar();
	const octaves = int( octaves_immutable ).toVar();
	const p = vec3( p_immutable ).toVar();

	return vec2( mx_fractal_noise_float$1( p, octaves, lacunarity, diminish ), mx_fractal_noise_float$1( p.add( vec3( int( 19 ), int( 193 ), int( 17 ) ) ), octaves, lacunarity, diminish ) );

} ).setLayout( {
	name: 'mx_fractal_noise_vec2',
	type: 'vec2',
	inputs: [
		{ name: 'p', type: 'vec3' },
		{ name: 'octaves', type: 'int' },
		{ name: 'lacunarity', type: 'float' },
		{ name: 'diminish', type: 'float' }
	]
} );

const mx_fractal_noise_vec4$1 = /*#__PURE__*/ tslFn( ( [ p_immutable, octaves_immutable, lacunarity_immutable, diminish_immutable ] ) => {

	const diminish = float( diminish_immutable ).toVar();
	const lacunarity = float( lacunarity_immutable ).toVar();
	const octaves = int( octaves_immutable ).toVar();
	const p = vec3( p_immutable ).toVar();
	const c = vec3( mx_fractal_noise_vec3$1( p, octaves, lacunarity, diminish ) ).toVar();
	const f = float( mx_fractal_noise_float$1( p.add( vec3( int( 19 ), int( 193 ), int( 17 ) ) ), octaves, lacunarity, diminish ) ).toVar();

	return vec4( c, f );

} ).setLayout( {
	name: 'mx_fractal_noise_vec4',
	type: 'vec4',
	inputs: [
		{ name: 'p', type: 'vec3' },
		{ name: 'octaves', type: 'int' },
		{ name: 'lacunarity', type: 'float' },
		{ name: 'diminish', type: 'float' }
	]
} );

const mx_worley_distance_0 = /*#__PURE__*/ tslFn( ( [ p_immutable, x_immutable, y_immutable, xoff_immutable, yoff_immutable, jitter_immutable, metric_immutable ] ) => {

	const metric = int( metric_immutable ).toVar();
	const jitter = float( jitter_immutable ).toVar();
	const yoff = int( yoff_immutable ).toVar();
	const xoff = int( xoff_immutable ).toVar();
	const y = int( y_immutable ).toVar();
	const x = int( x_immutable ).toVar();
	const p = vec2( p_immutable ).toVar();
	const tmp = vec3( mx_cell_noise_vec3( vec2( x.add( xoff ), y.add( yoff ) ) ) ).toVar();
	const off = vec2( tmp.x, tmp.y ).toVar();
	off.subAssign( 0.5 );
	off.mulAssign( jitter );
	off.addAssign( 0.5 );
	const cellpos = vec2( vec2( float( x ), float( y ) ).add( off ) ).toVar();
	const diff = vec2( cellpos.sub( p ) ).toVar();

	If( metric.equal( int( 2 ) ), () => {

		return abs( diff.x ).add( abs( diff.y ) );

	} );

	If( metric.equal( int( 3 ) ), () => {

		return max$1( abs( diff.x ), abs( diff.y ) );

	} );

	return dot( diff, diff );

} ).setLayout( {
	name: 'mx_worley_distance_0',
	type: 'float',
	inputs: [
		{ name: 'p', type: 'vec2' },
		{ name: 'x', type: 'int' },
		{ name: 'y', type: 'int' },
		{ name: 'xoff', type: 'int' },
		{ name: 'yoff', type: 'int' },
		{ name: 'jitter', type: 'float' },
		{ name: 'metric', type: 'int' }
	]
} );

const mx_worley_distance_1 = /*#__PURE__*/ tslFn( ( [ p_immutable, x_immutable, y_immutable, z_immutable, xoff_immutable, yoff_immutable, zoff_immutable, jitter_immutable, metric_immutable ] ) => {

	const metric = int( metric_immutable ).toVar();
	const jitter = float( jitter_immutable ).toVar();
	const zoff = int( zoff_immutable ).toVar();
	const yoff = int( yoff_immutable ).toVar();
	const xoff = int( xoff_immutable ).toVar();
	const z = int( z_immutable ).toVar();
	const y = int( y_immutable ).toVar();
	const x = int( x_immutable ).toVar();
	const p = vec3( p_immutable ).toVar();
	const off = vec3( mx_cell_noise_vec3( vec3( x.add( xoff ), y.add( yoff ), z.add( zoff ) ) ) ).toVar();
	off.subAssign( 0.5 );
	off.mulAssign( jitter );
	off.addAssign( 0.5 );
	const cellpos = vec3( vec3( float( x ), float( y ), float( z ) ).add( off ) ).toVar();
	const diff = vec3( cellpos.sub( p ) ).toVar();

	If( metric.equal( int( 2 ) ), () => {

		return abs( diff.x ).add( abs( diff.y ) ).add( abs( diff.z ) );

	} );

	If( metric.equal( int( 3 ) ), () => {

		return max$1( max$1( abs( diff.x ), abs( diff.y ) ), abs( diff.z ) );

	} );

	return dot( diff, diff );

} ).setLayout( {
	name: 'mx_worley_distance_1',
	type: 'float',
	inputs: [
		{ name: 'p', type: 'vec3' },
		{ name: 'x', type: 'int' },
		{ name: 'y', type: 'int' },
		{ name: 'z', type: 'int' },
		{ name: 'xoff', type: 'int' },
		{ name: 'yoff', type: 'int' },
		{ name: 'zoff', type: 'int' },
		{ name: 'jitter', type: 'float' },
		{ name: 'metric', type: 'int' }
	]
} );

const mx_worley_distance = /*#__PURE__*/ overloadingFn( [ mx_worley_distance_0, mx_worley_distance_1 ] );

const mx_worley_noise_float_0 = /*#__PURE__*/ tslFn( ( [ p_immutable, jitter_immutable, metric_immutable ] ) => {

	const metric = int( metric_immutable ).toVar();
	const jitter = float( jitter_immutable ).toVar();
	const p = vec2( p_immutable ).toVar();
	const X = int().toVar(), Y = int().toVar();
	const localpos = vec2( mx_floorfrac( p.x, X ), mx_floorfrac( p.y, Y ) ).toVar();
	const sqdist = float( 1e6 ).toVar();

	loop( { start: - 1, end: int( 1 ), name: 'x', condition: '<=' }, ( { x } ) => {

		loop( { start: - 1, end: int( 1 ), name: 'y', condition: '<=' }, ( { y } ) => {

			const dist = float( mx_worley_distance( localpos, x, y, X, Y, jitter, metric ) ).toVar();
			sqdist.assign( min$1( sqdist, dist ) );

		} );

	} );

	If( metric.equal( int( 0 ) ), () => {

		sqdist.assign( sqrt( sqdist ) );

	} );

	return sqdist;

} ).setLayout( {
	name: 'mx_worley_noise_float_0',
	type: 'float',
	inputs: [
		{ name: 'p', type: 'vec2' },
		{ name: 'jitter', type: 'float' },
		{ name: 'metric', type: 'int' }
	]
} );

const mx_worley_noise_vec2_0 = /*#__PURE__*/ tslFn( ( [ p_immutable, jitter_immutable, metric_immutable ] ) => {

	const metric = int( metric_immutable ).toVar();
	const jitter = float( jitter_immutable ).toVar();
	const p = vec2( p_immutable ).toVar();
	const X = int().toVar(), Y = int().toVar();
	const localpos = vec2( mx_floorfrac( p.x, X ), mx_floorfrac( p.y, Y ) ).toVar();
	const sqdist = vec2( 1e6, 1e6 ).toVar();

	loop( { start: - 1, end: int( 1 ), name: 'x', condition: '<=' }, ( { x } ) => {

		loop( { start: - 1, end: int( 1 ), name: 'y', condition: '<=' }, ( { y } ) => {

			const dist = float( mx_worley_distance( localpos, x, y, X, Y, jitter, metric ) ).toVar();

			If( dist.lessThan( sqdist.x ), () => {

				sqdist.y.assign( sqdist.x );
				sqdist.x.assign( dist );

			} ).elseif( dist.lessThan( sqdist.y ), () => {

				sqdist.y.assign( dist );

			} );

		} );

	} );

	If( metric.equal( int( 0 ) ), () => {

		sqdist.assign( sqrt( sqdist ) );

	} );

	return sqdist;

} ).setLayout( {
	name: 'mx_worley_noise_vec2_0',
	type: 'vec2',
	inputs: [
		{ name: 'p', type: 'vec2' },
		{ name: 'jitter', type: 'float' },
		{ name: 'metric', type: 'int' }
	]
} );

const mx_worley_noise_vec3_0 = /*#__PURE__*/ tslFn( ( [ p_immutable, jitter_immutable, metric_immutable ] ) => {

	const metric = int( metric_immutable ).toVar();
	const jitter = float( jitter_immutable ).toVar();
	const p = vec2( p_immutable ).toVar();
	const X = int().toVar(), Y = int().toVar();
	const localpos = vec2( mx_floorfrac( p.x, X ), mx_floorfrac( p.y, Y ) ).toVar();
	const sqdist = vec3( 1e6, 1e6, 1e6 ).toVar();

	loop( { start: - 1, end: int( 1 ), name: 'x', condition: '<=' }, ( { x } ) => {

		loop( { start: - 1, end: int( 1 ), name: 'y', condition: '<=' }, ( { y } ) => {

			const dist = float( mx_worley_distance( localpos, x, y, X, Y, jitter, metric ) ).toVar();

			If( dist.lessThan( sqdist.x ), () => {

				sqdist.z.assign( sqdist.y );
				sqdist.y.assign( sqdist.x );
				sqdist.x.assign( dist );

			} ).elseif( dist.lessThan( sqdist.y ), () => {

				sqdist.z.assign( sqdist.y );
				sqdist.y.assign( dist );

			} ).elseif( dist.lessThan( sqdist.z ), () => {

				sqdist.z.assign( dist );

			} );

		} );

	} );

	If( metric.equal( int( 0 ) ), () => {

		sqdist.assign( sqrt( sqdist ) );

	} );

	return sqdist;

} ).setLayout( {
	name: 'mx_worley_noise_vec3_0',
	type: 'vec3',
	inputs: [
		{ name: 'p', type: 'vec2' },
		{ name: 'jitter', type: 'float' },
		{ name: 'metric', type: 'int' }
	]
} );

const mx_worley_noise_float_1 = /*#__PURE__*/ tslFn( ( [ p_immutable, jitter_immutable, metric_immutable ] ) => {

	const metric = int( metric_immutable ).toVar();
	const jitter = float( jitter_immutable ).toVar();
	const p = vec3( p_immutable ).toVar();
	const X = int().toVar(), Y = int().toVar(), Z = int().toVar();
	const localpos = vec3( mx_floorfrac( p.x, X ), mx_floorfrac( p.y, Y ), mx_floorfrac( p.z, Z ) ).toVar();
	const sqdist = float( 1e6 ).toVar();

	loop( { start: - 1, end: int( 1 ), name: 'x', condition: '<=' }, ( { x } ) => {

		loop( { start: - 1, end: int( 1 ), name: 'y', condition: '<=' }, ( { y } ) => {

			loop( { start: - 1, end: int( 1 ), name: 'z', condition: '<=' }, ( { z } ) => {

				const dist = float( mx_worley_distance( localpos, x, y, z, X, Y, Z, jitter, metric ) ).toVar();
				sqdist.assign( min$1( sqdist, dist ) );

			} );

		} );

	} );

	If( metric.equal( int( 0 ) ), () => {

		sqdist.assign( sqrt( sqdist ) );

	} );

	return sqdist;

} ).setLayout( {
	name: 'mx_worley_noise_float_1',
	type: 'float',
	inputs: [
		{ name: 'p', type: 'vec3' },
		{ name: 'jitter', type: 'float' },
		{ name: 'metric', type: 'int' }
	]
} );

const mx_worley_noise_float$1 = /*#__PURE__*/ overloadingFn( [ mx_worley_noise_float_0, mx_worley_noise_float_1 ] );

const mx_worley_noise_vec2_1 = /*#__PURE__*/ tslFn( ( [ p_immutable, jitter_immutable, metric_immutable ] ) => {

	const metric = int( metric_immutable ).toVar();
	const jitter = float( jitter_immutable ).toVar();
	const p = vec3( p_immutable ).toVar();
	const X = int().toVar(), Y = int().toVar(), Z = int().toVar();
	const localpos = vec3( mx_floorfrac( p.x, X ), mx_floorfrac( p.y, Y ), mx_floorfrac( p.z, Z ) ).toVar();
	const sqdist = vec2( 1e6, 1e6 ).toVar();

	loop( { start: - 1, end: int( 1 ), name: 'x', condition: '<=' }, ( { x } ) => {

		loop( { start: - 1, end: int( 1 ), name: 'y', condition: '<=' }, ( { y } ) => {

			loop( { start: - 1, end: int( 1 ), name: 'z', condition: '<=' }, ( { z } ) => {

				const dist = float( mx_worley_distance( localpos, x, y, z, X, Y, Z, jitter, metric ) ).toVar();

				If( dist.lessThan( sqdist.x ), () => {

					sqdist.y.assign( sqdist.x );
					sqdist.x.assign( dist );

				} ).elseif( dist.lessThan( sqdist.y ), () => {

					sqdist.y.assign( dist );

				} );

			} );

		} );

	} );

	If( metric.equal( int( 0 ) ), () => {

		sqdist.assign( sqrt( sqdist ) );

	} );

	return sqdist;

} ).setLayout( {
	name: 'mx_worley_noise_vec2_1',
	type: 'vec2',
	inputs: [
		{ name: 'p', type: 'vec3' },
		{ name: 'jitter', type: 'float' },
		{ name: 'metric', type: 'int' }
	]
} );

const mx_worley_noise_vec2$1 = /*#__PURE__*/ overloadingFn( [ mx_worley_noise_vec2_0, mx_worley_noise_vec2_1 ] );

const mx_worley_noise_vec3_1 = /*#__PURE__*/ tslFn( ( [ p_immutable, jitter_immutable, metric_immutable ] ) => {

	const metric = int( metric_immutable ).toVar();
	const jitter = float( jitter_immutable ).toVar();
	const p = vec3( p_immutable ).toVar();
	const X = int().toVar(), Y = int().toVar(), Z = int().toVar();
	const localpos = vec3( mx_floorfrac( p.x, X ), mx_floorfrac( p.y, Y ), mx_floorfrac( p.z, Z ) ).toVar();
	const sqdist = vec3( 1e6, 1e6, 1e6 ).toVar();

	loop( { start: - 1, end: int( 1 ), name: 'x', condition: '<=' }, ( { x } ) => {

		loop( { start: - 1, end: int( 1 ), name: 'y', condition: '<=' }, ( { y } ) => {

			loop( { start: - 1, end: int( 1 ), name: 'z', condition: '<=' }, ( { z } ) => {

				const dist = float( mx_worley_distance( localpos, x, y, z, X, Y, Z, jitter, metric ) ).toVar();

				If( dist.lessThan( sqdist.x ), () => {

					sqdist.z.assign( sqdist.y );
					sqdist.y.assign( sqdist.x );
					sqdist.x.assign( dist );

				} ).elseif( dist.lessThan( sqdist.y ), () => {

					sqdist.z.assign( sqdist.y );
					sqdist.y.assign( dist );

				} ).elseif( dist.lessThan( sqdist.z ), () => {

					sqdist.z.assign( dist );

				} );

			} );

		} );

	} );

	If( metric.equal( int( 0 ) ), () => {

		sqdist.assign( sqrt( sqdist ) );

	} );

	return sqdist;

} ).setLayout( {
	name: 'mx_worley_noise_vec3_1',
	type: 'vec3',
	inputs: [
		{ name: 'p', type: 'vec3' },
		{ name: 'jitter', type: 'float' },
		{ name: 'metric', type: 'int' }
	]
} );

const mx_worley_noise_vec3$1 = /*#__PURE__*/ overloadingFn( [ mx_worley_noise_vec3_0, mx_worley_noise_vec3_1 ] );

// Three.js Transpiler
// https://github.com/AcademySoftwareFoundation/MaterialX/blob/main/libraries/stdlib/genglsl/lib/mx_hsv.glsl


const mx_hsvtorgb = /*#__PURE__*/ tslFn( ( [ hsv_immutable ] ) => {

	const hsv = vec3( hsv_immutable ).toVar();
	const h = float( hsv.x ).toVar();
	const s = float( hsv.y ).toVar();
	const v = float( hsv.z ).toVar();

	If( s.lessThan( 0.0001 ), () => {

		return vec3( v, v, v );

	} ).else( () => {

		h.assign( mul( 6.0, h.sub( floor( h ) ) ) );
		const hi = int( trunc( h ) ).toVar();
		const f = float( h.sub( float( hi ) ) ).toVar();
		const p = float( v.mul( sub( 1.0, s ) ) ).toVar();
		const q = float( v.mul( sub( 1.0, s.mul( f ) ) ) ).toVar();
		const t = float( v.mul( sub( 1.0, s.mul( sub( 1.0, f ) ) ) ) ).toVar();

		If( hi.equal( int( 0 ) ), () => {

			return vec3( v, t, p );

		} ).elseif( hi.equal( int( 1 ) ), () => {

			return vec3( q, v, p );

		} ).elseif( hi.equal( int( 2 ) ), () => {

			return vec3( p, v, t );

		} ).elseif( hi.equal( int( 3 ) ), () => {

			return vec3( p, q, v );

		} ).elseif( hi.equal( int( 4 ) ), () => {

			return vec3( t, p, v );

		} );

		return vec3( v, p, q );

	} );

} ).setLayout( {
	name: 'mx_hsvtorgb',
	type: 'vec3',
	inputs: [
		{ name: 'hsv', type: 'vec3' }
	]
} );

const mx_rgbtohsv = /*#__PURE__*/ tslFn( ( [ c_immutable ] ) => {

	const c = vec3( c_immutable ).toVar();
	const r = float( c.x ).toVar();
	const g = float( c.y ).toVar();
	const b = float( c.z ).toVar();
	const mincomp = float( min$1( r, min$1( g, b ) ) ).toVar();
	const maxcomp = float( max$1( r, max$1( g, b ) ) ).toVar();
	const delta = float( maxcomp.sub( mincomp ) ).toVar();
	const h = float().toVar(), s = float().toVar(), v = float().toVar();
	v.assign( maxcomp );

	If( maxcomp.greaterThan( 0.0 ), () => {

		s.assign( delta.div( maxcomp ) );

	} ).else( () => {

		s.assign( 0.0 );

	} );

	If( s.lessThanEqual( 0.0 ), () => {

		h.assign( 0.0 );

	} ).else( () => {

		If( r.greaterThanEqual( maxcomp ), () => {

			h.assign( g.sub( b ).div( delta ) );

		} ).elseif( g.greaterThanEqual( maxcomp ), () => {

			h.assign( add( 2.0, b.sub( r ).div( delta ) ) );

		} ).else( () => {

			h.assign( add( 4.0, r.sub( g ).div( delta ) ) );

		} );

		h.mulAssign( 1.0 / 6.0 );

		If( h.lessThan( 0.0 ), () => {

			h.addAssign( 1.0 );

		} );

	} );

	return vec3( h, s, v );

} ).setLayout( {
	name: 'mx_rgbtohsv',
	type: 'vec3',
	inputs: [
		{ name: 'c', type: 'vec3' }
	]
} );

// Three.js Transpiler
// https://github.com/AcademySoftwareFoundation/MaterialX/blob/main/libraries/stdlib/genglsl/lib/mx_transform_color.glsl


const mx_srgb_texture_to_lin_rec709 = /*#__PURE__*/ tslFn( ( [ color_immutable ] ) => {

	const color = vec3( color_immutable ).toVar();
	const isAbove = bvec3( greaterThan( color, vec3( 0.04045 ) ) ).toVar();
	const linSeg = vec3( color.div( 12.92 ) ).toVar();
	const powSeg = vec3( pow( max$1( color.add( vec3( 0.055 ) ), vec3( 0.0 ) ).div( 1.055 ), vec3( 2.4 ) ) ).toVar();

	return mix( linSeg, powSeg, isAbove );

} ).setLayout( {
	name: 'mx_srgb_texture_to_lin_rec709',
	type: 'vec3',
	inputs: [
		{ name: 'color', type: 'vec3' }
	]
} );

const mx_aastep = ( threshold, value ) => {

	threshold = float( threshold );
	value = float( value );

	const afwidth = vec2( value.dFdx(), value.dFdy() ).length().mul( 0.70710678118654757 );

	return smoothstep( threshold.sub( afwidth ), threshold.add( afwidth ), value );

};

const _ramp = ( a, b, uv, p ) => mix( a, b, uv[ p ].clamp() );
const mx_ramplr = ( valuel, valuer, texcoord = uv() ) => _ramp( valuel, valuer, texcoord, 'x' );
const mx_ramptb = ( valuet, valueb, texcoord = uv() ) => _ramp( valuet, valueb, texcoord, 'y' );

const _split = ( a, b, center, uv, p ) => mix( a, b, mx_aastep( center, uv[ p ] ) );
const mx_splitlr = ( valuel, valuer, center, texcoord = uv() ) => _split( valuel, valuer, center, texcoord, 'x' );
const mx_splittb = ( valuet, valueb, center, texcoord = uv() ) => _split( valuet, valueb, center, texcoord, 'y' );

const mx_transform_uv = ( uv_scale = 1, uv_offset = 0, uv_geo = uv() ) => uv_geo.mul( uv_scale ).add( uv_offset );

const mx_safepower = ( in1, in2 = 1 ) => {

	in1 = float( in1 );

	return in1.abs().pow( in2 ).mul( in1.sign() );

};

const mx_contrast = ( input, amount = 1, pivot = .5 ) => float( input ).sub( pivot ).mul( amount ).add( pivot );

const mx_noise_float = ( texcoord = uv(), amplitude = 1, pivot = 0 ) => mx_perlin_noise_float( texcoord.convert( 'vec2|vec3' ) ).mul( amplitude ).add( pivot );
//export const mx_noise_vec2 = ( texcoord = uv(), amplitude = 1, pivot = 0 ) => mx_perlin_noise_vec3( texcoord.convert( 'vec2|vec3' ) ).mul( amplitude ).add( pivot );
const mx_noise_vec3 = ( texcoord = uv(), amplitude = 1, pivot = 0 ) => mx_perlin_noise_vec3( texcoord.convert( 'vec2|vec3' ) ).mul( amplitude ).add( pivot );
const mx_noise_vec4 = ( texcoord = uv(), amplitude = 1, pivot = 0 ) => {

	texcoord = texcoord.convert( 'vec2|vec3' ); // overloading type

	const noise_vec4 = vec4( mx_perlin_noise_vec3( texcoord ), mx_perlin_noise_float( texcoord.add( vec2( 19, 73 ) ) ) );

	return noise_vec4.mul( amplitude ).add( pivot );

};

const mx_worley_noise_float = ( texcoord = uv(), jitter = 1 ) => mx_worley_noise_float$1( texcoord.convert( 'vec2|vec3' ), jitter, int( 1 ) );
const mx_worley_noise_vec2 = ( texcoord = uv(), jitter = 1 ) => mx_worley_noise_vec2$1( texcoord.convert( 'vec2|vec3' ), jitter, int( 1 ) );
const mx_worley_noise_vec3 = ( texcoord = uv(), jitter = 1 ) => mx_worley_noise_vec3$1( texcoord.convert( 'vec2|vec3' ), jitter, int( 1 ) );

const mx_cell_noise_float = ( texcoord = uv() ) => mx_cell_noise_float$1( texcoord.convert( 'vec2|vec3' ) );

const mx_fractal_noise_float = ( position = uv(), octaves = 3, lacunarity = 2, diminish = .5, amplitude = 1 ) => mx_fractal_noise_float$1( position, int( octaves ), lacunarity, diminish ).mul( amplitude );
const mx_fractal_noise_vec2 = ( position = uv(), octaves = 3, lacunarity = 2, diminish = .5, amplitude = 1 ) => mx_fractal_noise_vec2$1( position, int( octaves ), lacunarity, diminish ).mul( amplitude );
const mx_fractal_noise_vec3 = ( position = uv(), octaves = 3, lacunarity = 2, diminish = .5, amplitude = 1 ) => mx_fractal_noise_vec3$1( position, int( octaves ), lacunarity, diminish ).mul( amplitude );
const mx_fractal_noise_vec4 = ( position = uv(), octaves = 3, lacunarity = 2, diminish = .5, amplitude = 1 ) => mx_fractal_noise_vec4$1( position, int( octaves ), lacunarity, diminish ).mul( amplitude );

function painterSortStable( a, b ) {

	if ( a.groupOrder !== b.groupOrder ) {

		return a.groupOrder - b.groupOrder;

	} else if ( a.renderOrder !== b.renderOrder ) {

		return a.renderOrder - b.renderOrder;

	} else if ( a.material.id !== b.material.id ) {

		return a.material.id - b.material.id;

	} else if ( a.z !== b.z ) {

		return a.z - b.z;

	} else {

		return a.id - b.id;

	}

}

function reversePainterSortStable( a, b ) {

	if ( a.groupOrder !== b.groupOrder ) {

		return a.groupOrder - b.groupOrder;

	} else if ( a.renderOrder !== b.renderOrder ) {

		return a.renderOrder - b.renderOrder;

	} else if ( a.z !== b.z ) {

		return b.z - a.z;

	} else {

		return a.id - b.id;

	}

}

class RenderList {

	constructor() {

		this.renderItems = [];
		this.renderItemsIndex = 0;

		this.opaque = [];
		this.transparent = [];
		this.bundles = [];

		this.lightsNode = new LightsNode( [] );
		this.lightsArray = [];

		this.occlusionQueryCount = 0;

	}

	begin() {

		this.renderItemsIndex = 0;

		this.opaque.length = 0;
		this.transparent.length = 0;
		this.bundles.length = 0;

		this.lightsArray.length = 0;

		this.occlusionQueryCount = 0;

		return this;

	}

	getNextRenderItem( object, geometry, material, groupOrder, z, group ) {

		let renderItem = this.renderItems[ this.renderItemsIndex ];

		if ( renderItem === undefined ) {

			renderItem = {
				id: object.id,
				object: object,
				geometry: geometry,
				material: material,
				groupOrder: groupOrder,
				renderOrder: object.renderOrder,
				z: z,
				group: group
			};

			this.renderItems[ this.renderItemsIndex ] = renderItem;

		} else {

			renderItem.id = object.id;
			renderItem.object = object;
			renderItem.geometry = geometry;
			renderItem.material = material;
			renderItem.groupOrder = groupOrder;
			renderItem.renderOrder = object.renderOrder;
			renderItem.z = z;
			renderItem.group = group;

		}

		this.renderItemsIndex ++;

		return renderItem;

	}

	push( object, geometry, material, groupOrder, z, group ) {

		const renderItem = this.getNextRenderItem( object, geometry, material, groupOrder, z, group );

		if ( object.occlusionTest === true ) this.occlusionQueryCount ++;

		( material.transparent === true || material.transmission > 0 ? this.transparent : this.opaque ).push( renderItem );

	}

	unshift( object, geometry, material, groupOrder, z, group ) {

		const renderItem = this.getNextRenderItem( object, geometry, material, groupOrder, z, group );

		( material.transparent === true ? this.transparent : this.opaque ).unshift( renderItem );

	}

	pushBundle( group ) {

		this.bundles.push( group );

	}

	pushLight( light ) {

		this.lightsArray.push( light );

	}

	getLightsNode() {

		return this.lightsNode.fromLights( this.lightsArray );

	}

	sort( customOpaqueSort, customTransparentSort ) {

		if ( this.opaque.length > 1 ) this.opaque.sort( customOpaqueSort || painterSortStable );
		if ( this.transparent.length > 1 ) this.transparent.sort( customTransparentSort || reversePainterSortStable );

	}

	finish() {

		// update lights

		this.lightsNode.fromLights( this.lightsArray );

		// Clear references from inactive renderItems in the list

		for ( let i = this.renderItemsIndex, il = this.renderItems.length; i < il; i ++ ) {

			const renderItem = this.renderItems[ i ];

			if ( renderItem.id === null ) break;

			renderItem.id = null;
			renderItem.object = null;
			renderItem.geometry = null;
			renderItem.material = null;
			renderItem.groupOrder = null;
			renderItem.renderOrder = null;
			renderItem.z = null;
			renderItem.group = null;

		}

	}

}

class RenderLists {

	constructor() {

		this.lists = new ChainMap();

	}

	get( scene, camera ) {

		const lists = this.lists;
		const keys = [ scene, camera ];

		let list = lists.get( keys );

		if ( list === undefined ) {

			list = new RenderList();
			lists.set( keys, list );

		}

		return list;

	}

	dispose() {

		this.lists = new ChainMap();

	}

}

let id$2 = 0;

class RenderContext {

	constructor() {

		this.id = id$2 ++;

		this.color = true;
		this.clearColor = true;
		this.clearColorValue = { r: 0, g: 0, b: 0, a: 1 };

		this.depth = true;
		this.clearDepth = true;
		this.clearDepthValue = 1;

		this.stencil = false;
		this.clearStencil = true;
		this.clearStencilValue = 1;

		this.viewport = false;
		this.viewportValue = new Vector4();

		this.scissor = false;
		this.scissorValue = new Vector4();

		this.textures = null;
		this.depthTexture = null;
		this.activeCubeFace = 0;
		this.sampleCount = 1;

		this.width = 0;
		this.height = 0;

		this.isRenderContext = true;

	}

}

class RenderContexts {

	constructor() {

		this.chainMaps = {};

	}

	get( scene, camera, renderTarget = null ) {

		const chainKey = [ scene, camera ];

		let attachmentState;

		if ( renderTarget === null ) {

			attachmentState = 'default';

		} else {

			const format = renderTarget.texture.format;
			const count = renderTarget.count;

			attachmentState = `${ count }:${ format }:${ renderTarget.samples }:${ renderTarget.depthBuffer }:${ renderTarget.stencilBuffer }`;

		}

		const chainMap = this.getChainMap( attachmentState );

		let renderState = chainMap.get( chainKey );

		if ( renderState === undefined ) {

			renderState = new RenderContext();

			chainMap.set( chainKey, renderState );

		}

		if ( renderTarget !== null ) renderState.sampleCount = renderTarget.samples === 0 ? 1 : renderTarget.samples;

		return renderState;

	}

	getChainMap( attachmentState ) {

		return this.chainMaps[ attachmentState ] || ( this.chainMaps[ attachmentState ] = new ChainMap() );

	}

	dispose() {

		this.chainMaps = {};

	}

}

const _size = new Vector3();

class Textures extends DataMap {

	constructor( renderer, backend, info ) {

		super();

		this.renderer = renderer;
		this.backend = backend;
		this.info = info;

	}

	updateRenderTarget( renderTarget, activeMipmapLevel = 0 ) {

		const renderTargetData = this.get( renderTarget );

		const sampleCount = renderTarget.samples === 0 ? 1 : renderTarget.samples;
		const depthTextureMips = renderTargetData.depthTextureMips || ( renderTargetData.depthTextureMips = {} );

		const texture = renderTarget.texture;
		const textures = renderTarget.textures;

		const size = this.getSize( texture );

		const mipWidth = size.width >> activeMipmapLevel;
		const mipHeight = size.height >> activeMipmapLevel;

		let depthTexture = renderTarget.depthTexture || depthTextureMips[ activeMipmapLevel ];
		let textureNeedsUpdate = false;

		if ( depthTexture === undefined ) {

			depthTexture = new DepthTexture();
			depthTexture.format = renderTarget.stencilBuffer ? DepthStencilFormat : DepthFormat;
			depthTexture.type = renderTarget.stencilBuffer ? UnsignedInt248Type : UnsignedIntType; // FloatType
			depthTexture.image.width = mipWidth;
			depthTexture.image.height = mipHeight;

			depthTextureMips[ activeMipmapLevel ] = depthTexture;

		}

		if ( renderTargetData.width !== size.width || size.height !== renderTargetData.height ) {

			textureNeedsUpdate = true;
			depthTexture.needsUpdate = true;

			depthTexture.image.width = mipWidth;
			depthTexture.image.height = mipHeight;

		}

		renderTargetData.width = size.width;
		renderTargetData.height = size.height;
		renderTargetData.textures = textures;
		renderTargetData.depthTexture = depthTexture;
		renderTargetData.depth = renderTarget.depthBuffer;
		renderTargetData.stencil = renderTarget.stencilBuffer;
		renderTargetData.renderTarget = renderTarget;

		if ( renderTargetData.sampleCount !== sampleCount ) {

			textureNeedsUpdate = true;
			depthTexture.needsUpdate = true;

			renderTargetData.sampleCount = sampleCount;

		}

		//

		const options = { sampleCount };

		for ( let i = 0; i < textures.length; i ++ ) {

			const texture = textures[ i ];

			if ( textureNeedsUpdate ) texture.needsUpdate = true;

			this.updateTexture( texture, options );

		}

		this.updateTexture( depthTexture, options );

		// dispose handler

		if ( renderTargetData.initialized !== true ) {

			renderTargetData.initialized = true;

			// dispose

			const onDispose = () => {

				renderTarget.removeEventListener( 'dispose', onDispose );

				if ( textures !== undefined ) {

					for ( let i = 0; i < textures.length; i ++ ) {

						this._destroyTexture( textures[ i ] );

					}

				} else {

					this._destroyTexture( texture );

				}

				this._destroyTexture( depthTexture );

			};

			renderTarget.addEventListener( 'dispose', onDispose );

		}

	}

	updateTexture( texture, options = {} ) {

		const textureData = this.get( texture );
		if ( textureData.initialized === true && textureData.version === texture.version ) return;

		const isRenderTarget = texture.isRenderTargetTexture || texture.isDepthTexture || texture.isFramebufferTexture;
		const backend = this.backend;

		if ( isRenderTarget && textureData.initialized === true ) {

			// it's an update

			backend.destroySampler( texture );
			backend.destroyTexture( texture );

		}

		//

		if ( texture.isFramebufferTexture ) {

			const renderer = this.renderer;
			const renderTarget = renderer.getRenderTarget();

			if ( renderTarget ) {

				texture.type = renderTarget.texture.type;

			} else {

				texture.type = UnsignedByteType;

			}

		}

		//

		const { width, height, depth } = this.getSize( texture );

		options.width = width;
		options.height = height;
		options.depth = depth;
		options.needsMipmaps = this.needsMipmaps( texture );
		options.levels = options.needsMipmaps ? this.getMipLevels( texture, width, height ) : 1;

		//

		if ( isRenderTarget || texture.isStorageTexture === true ) {

			backend.createSampler( texture );
			backend.createTexture( texture, options );

		} else {

			const needsCreate = textureData.initialized !== true;

			if ( needsCreate ) backend.createSampler( texture );

			if ( texture.version > 0 ) {

				const image = texture.image;

				if ( image === undefined ) {

					console.warn( 'THREE.Renderer: Texture marked for update but image is undefined.' );

				} else if ( image.complete === false ) {

					console.warn( 'THREE.Renderer: Texture marked for update but image is incomplete.' );

				} else {

					if ( texture.images ) {

						const images = [];

						for ( const image of texture.images ) {

							images.push( image );

						}

						options.images = images;

					} else {

						options.image = image;

					}

					if ( textureData.isDefaultTexture === undefined || textureData.isDefaultTexture === true ) {

						backend.createTexture( texture, options );

						textureData.isDefaultTexture = false;

					}

					if ( texture.source.dataReady === true ) backend.updateTexture( texture, options );

					if ( options.needsMipmaps && texture.mipmaps.length === 0 ) backend.generateMipmaps( texture );

				}

			} else {

				// async update

				backend.createDefaultTexture( texture );

				textureData.isDefaultTexture = true;

			}

		}

		// dispose handler

		if ( textureData.initialized !== true ) {

			textureData.initialized = true;

			//

			this.info.memory.textures ++;

			// dispose

			const onDispose = () => {

				texture.removeEventListener( 'dispose', onDispose );

				this._destroyTexture( texture );

				this.info.memory.textures --;

			};

			texture.addEventListener( 'dispose', onDispose );

		}

		//

		textureData.version = texture.version;

	}

	getSize( texture, target = _size ) {

		let image = texture.images ? texture.images[ 0 ] : texture.image;

		if ( image ) {

			if ( image.image !== undefined ) image = image.image;

			target.width = image.width;
			target.height = image.height;
			target.depth = texture.isCubeTexture ? 6 : ( image.depth || 1 );

		} else {

			target.width = target.height = target.depth = 1;

		}

		return target;

	}

	getMipLevels( texture, width, height ) {

		let mipLevelCount;

		if ( texture.isCompressedTexture ) {

			mipLevelCount = texture.mipmaps.length;

		} else {

			mipLevelCount = Math.floor( Math.log2( Math.max( width, height ) ) ) + 1;

		}

		return mipLevelCount;

	}

	needsMipmaps( texture ) {

		if ( this.isEnvironmentTexture( texture ) ) return true;

		return ( texture.isCompressedTexture === true ) || ( ( texture.minFilter !== NearestFilter ) && ( texture.minFilter !== LinearFilter ) );

	}

	isEnvironmentTexture( texture ) {

		const mapping = texture.mapping;

		return ( mapping === EquirectangularReflectionMapping || mapping === EquirectangularRefractionMapping ) || ( mapping === CubeReflectionMapping || mapping === CubeRefractionMapping );

	}

	_destroyTexture( texture ) {

		this.backend.destroySampler( texture );
		this.backend.destroyTexture( texture );

		this.delete( texture );

	}

}

class Color4 extends Color {

	constructor( r, g, b, a = 1 ) {

		super( r, g, b );

		this.a = a;

	}

	set( r, g, b, a = 1 ) {

		this.a = a;

		return super.set( r, g, b );

	}

	copy( color ) {

		if ( color.a !== undefined ) this.a = color.a;

		return super.copy( color );

	}

	clone() {

		return new this.constructor( this.r, this.g, this.b, this.a );

	}

}

const _clearColor = new Color4();

class Background extends DataMap {

	constructor( renderer, nodes ) {

		super();

		this.renderer = renderer;
		this.nodes = nodes;

	}

	update( scene, renderList, renderContext ) {

		const renderer = this.renderer;
		const background = this.nodes.getBackgroundNode( scene ) || scene.background;

		let forceClear = false;

		if ( background === null ) {

			// no background settings, use clear color configuration from the renderer

			renderer._clearColor.getRGB( _clearColor, LinearSRGBColorSpace );
			_clearColor.a = renderer._clearColor.a;

		} else if ( background.isColor === true ) {

			// background is an opaque color

			background.getRGB( _clearColor, LinearSRGBColorSpace );
			_clearColor.a = 1;

			forceClear = true;

		} else if ( background.isNode === true ) {

			const sceneData = this.get( scene );
			const backgroundNode = background;

			_clearColor.copy( renderer._clearColor );

			let backgroundMesh = sceneData.backgroundMesh;

			if ( backgroundMesh === undefined ) {

				const backgroundMeshNode = context( vec4( backgroundNode ).mul( backgroundIntensity ), {
					// @TODO: Add Texture2D support using node context
					getUV: () => normalWorld,
					getTextureLevel: () => backgroundBlurriness
				} );

				let viewProj = modelViewProjection();
				viewProj = viewProj.setZ( viewProj.w );

				const nodeMaterial = new NodeMaterial();
				nodeMaterial.side = BackSide;
				nodeMaterial.depthTest = false;
				nodeMaterial.depthWrite = false;
				nodeMaterial.fog = false;
				nodeMaterial.vertexNode = viewProj;
				nodeMaterial.fragmentNode = backgroundMeshNode;

				sceneData.backgroundMeshNode = backgroundMeshNode;
				sceneData.backgroundMesh = backgroundMesh = new Mesh( new SphereGeometry( 1, 32, 32 ), nodeMaterial );
				backgroundMesh.frustumCulled = false;

				backgroundMesh.onBeforeRender = function ( renderer, scene, camera ) {

					this.matrixWorld.copyPosition( camera.matrixWorld );

				};

			}

			const backgroundCacheKey = backgroundNode.getCacheKey();

			if ( sceneData.backgroundCacheKey !== backgroundCacheKey ) {

				sceneData.backgroundMeshNode.node = vec4( backgroundNode ).mul( backgroundIntensity );

				backgroundMesh.material.needsUpdate = true;

				sceneData.backgroundCacheKey = backgroundCacheKey;

			}

			renderList.unshift( backgroundMesh, backgroundMesh.geometry, backgroundMesh.material, 0, 0, null );

		} else {

			console.error( 'THREE.Renderer: Unsupported background configuration.', background );

		}

		//

		if ( renderer.autoClear === true || forceClear === true ) {

			_clearColor.multiplyScalar( _clearColor.a );

			const clearColorValue = renderContext.clearColorValue;

			clearColorValue.r = _clearColor.r;
			clearColorValue.g = _clearColor.g;
			clearColorValue.b = _clearColor.b;
			clearColorValue.a = _clearColor.a;

			renderContext.depthClearValue = renderer._clearDepth;
			renderContext.stencilClearValue = renderer._clearStencil;

			renderContext.clearColor = renderer.autoClearColor === true;
			renderContext.clearDepth = renderer.autoClearDepth === true;
			renderContext.clearStencil = renderer.autoClearStencil === true;

		} else {

			renderContext.clearColor = false;
			renderContext.clearDepth = false;
			renderContext.clearStencil = false;

		}

	}

}

class NodeBuilderState {

	constructor( vertexShader, fragmentShader, computeShader, nodeAttributes, bindings, updateNodes, updateBeforeNodes, updateAfterNodes, instanceBindGroups = true, transforms = [] ) {

		this.vertexShader = vertexShader;
		this.fragmentShader = fragmentShader;
		this.computeShader = computeShader;
		this.transforms = transforms;

		this.nodeAttributes = nodeAttributes;
		this.bindings = bindings;

		this.updateNodes = updateNodes;
		this.updateBeforeNodes = updateBeforeNodes;
		this.updateAfterNodes = updateAfterNodes;

		this.instanceBindGroups = instanceBindGroups;

		this.usedTimes = 0;

	}

	createBindings() {

		const bindings = [];

		for ( const instanceGroup of this.bindings ) {

			const shared = this.instanceBindGroups && instanceGroup.bindings[ 0 ].groupNode.shared;

			if ( shared !== true ) {

				const bindingsGroup = new BindGroup( instanceGroup.name );
				bindings.push( bindingsGroup );

				for ( const instanceBinding of instanceGroup.bindings ) {

					bindingsGroup.bindings.push( instanceBinding.clone() );

				}

			} else {

				bindings.push( instanceGroup );

			}

		}

		return bindings;

	}

}

const outputNodeMap = new WeakMap();

class Nodes extends DataMap {

	constructor( renderer, backend ) {

		super();

		this.renderer = renderer;
		this.backend = backend;
		this.nodeFrame = new NodeFrame();
		this.nodeBuilderCache = new Map();
		this.callHashCache = new ChainMap();
		this.groupsData = new ChainMap();

	}

	updateGroup( nodeUniformsGroup ) {

		const groupNode = nodeUniformsGroup.groupNode;
		const name = groupNode.name;

		// objectGroup is every updated

		if ( name === objectGroup.name ) return true;

		// renderGroup is updated once per render/compute call

		if ( name === renderGroup.name ) {

			const uniformsGroupData = this.get( nodeUniformsGroup );
			const renderId = this.nodeFrame.renderId;

			if ( uniformsGroupData.renderId !== renderId ) {

				uniformsGroupData.renderId = renderId;

				return true;

			}

			return false;

		}

		// frameGroup is updated once per frame

		if ( name === frameGroup.name ) {

			const uniformsGroupData = this.get( nodeUniformsGroup );
			const frameId = this.nodeFrame.frameId;

			if ( uniformsGroupData.frameId !== frameId ) {

				uniformsGroupData.frameId = frameId;

				return true;

			}

			return false;

		}

		// other groups are updated just when groupNode.needsUpdate is true

		const groupChain = [ groupNode, nodeUniformsGroup ];

		let groupData = this.groupsData.get( groupChain );
		if ( groupData === undefined ) this.groupsData.set( groupChain, groupData = {} );

		if ( groupData.version !== groupNode.version ) {

			groupData.version = groupNode.version;

			return true;

		}

		return false;

	}

	getForRenderCacheKey( renderObject ) {

		return renderObject.initialCacheKey;

	}

	getForRender( renderObject ) {

		const renderObjectData = this.get( renderObject );

		let nodeBuilderState = renderObjectData.nodeBuilderState;

		if ( nodeBuilderState === undefined ) {

			const { nodeBuilderCache } = this;

			const cacheKey = this.getForRenderCacheKey( renderObject );

			nodeBuilderState = nodeBuilderCache.get( cacheKey );

			if ( nodeBuilderState === undefined ) {

				const nodeBuilder = this.backend.createNodeBuilder( renderObject.object, this.renderer );
				nodeBuilder.scene = renderObject.scene;
				nodeBuilder.material = renderObject.material;
				nodeBuilder.camera = renderObject.camera;
				nodeBuilder.context.material = renderObject.material;
				nodeBuilder.lightsNode = renderObject.lightsNode;
				nodeBuilder.environmentNode = this.getEnvironmentNode( renderObject.scene );
				nodeBuilder.fogNode = this.getFogNode( renderObject.scene );
				nodeBuilder.clippingContext = renderObject.clippingContext;
				nodeBuilder.build();

				nodeBuilderState = this._createNodeBuilderState( nodeBuilder );

				nodeBuilderCache.set( cacheKey, nodeBuilderState );

			}

			nodeBuilderState.usedTimes ++;

			renderObjectData.nodeBuilderState = nodeBuilderState;

		}

		return nodeBuilderState;

	}

	delete( object ) {

		if ( object.isRenderObject ) {

			const nodeBuilderState = this.get( object ).nodeBuilderState;
			nodeBuilderState.usedTimes --;

			if ( nodeBuilderState.usedTimes === 0 ) {

				this.nodeBuilderCache.delete( this.getForRenderCacheKey( object ) );

			}

		}

		return super.delete( object );

	}

	getForCompute( computeNode ) {

		const computeData = this.get( computeNode );

		let nodeBuilderState = computeData.nodeBuilderState;

		if ( nodeBuilderState === undefined ) {

			const nodeBuilder = this.backend.createNodeBuilder( computeNode, this.renderer );
			nodeBuilder.build();

			nodeBuilderState = this._createNodeBuilderState( nodeBuilder );

			computeData.nodeBuilderState = nodeBuilderState;

		}

		return nodeBuilderState;

	}

	_createNodeBuilderState( nodeBuilder ) {

		return new NodeBuilderState(
			nodeBuilder.vertexShader,
			nodeBuilder.fragmentShader,
			nodeBuilder.computeShader,
			nodeBuilder.getAttributesArray(),
			nodeBuilder.getBindings(),
			nodeBuilder.updateNodes,
			nodeBuilder.updateBeforeNodes,
			nodeBuilder.updateAfterNodes,
			nodeBuilder.instanceBindGroups,
			nodeBuilder.transforms
		);

	}

	getEnvironmentNode( scene ) {

		return scene.environmentNode || this.get( scene ).environmentNode || null;

	}

	getBackgroundNode( scene ) {

		return scene.backgroundNode || this.get( scene ).backgroundNode || null;

	}

	getFogNode( scene ) {

		return scene.fogNode || this.get( scene ).fogNode || null;

	}

	getCacheKey( scene, lightsNode ) {

		const chain = [ scene, lightsNode ];
		const callId = this.renderer.info.calls;

		let cacheKeyData = this.callHashCache.get( chain );

		if ( cacheKeyData === undefined || cacheKeyData.callId !== callId ) {

			const environmentNode = this.getEnvironmentNode( scene );
			const fogNode = this.getFogNode( scene );

			const cacheKey = [];

			if ( lightsNode ) cacheKey.push( lightsNode.getCacheKey() );
			if ( environmentNode ) cacheKey.push( environmentNode.getCacheKey() );
			if ( fogNode ) cacheKey.push( fogNode.getCacheKey() );

			cacheKeyData = {
				callId,
				cacheKey: cacheKey.join( ',' )
			};

			this.callHashCache.set( chain, cacheKeyData );

		}

		return cacheKeyData.cacheKey;

	}

	updateScene( scene ) {

		this.updateEnvironment( scene );
		this.updateFog( scene );
		this.updateBackground( scene );

	}

	get isToneMappingState() {

		return this.renderer.getRenderTarget() ? false : true;

	}

	updateBackground( scene ) {

		const sceneData = this.get( scene );
		const background = scene.background;

		if ( background ) {

			if ( sceneData.background !== background ) {

				let backgroundNode = null;

				if ( background.isCubeTexture === true || ( background.mapping === EquirectangularReflectionMapping || background.mapping === EquirectangularRefractionMapping ) ) {

					backgroundNode = pmremTexture( background, normalWorld );

				} else if ( background.isTexture === true ) {

					backgroundNode = texture( background, viewportBottomLeft ).setUpdateMatrix( true );

				} else if ( background.isColor !== true ) {

					console.error( 'WebGPUNodes: Unsupported background configuration.', background );

				}

				sceneData.backgroundNode = backgroundNode;
				sceneData.background = background;

			}

		} else if ( sceneData.backgroundNode ) {

			delete sceneData.backgroundNode;
			delete sceneData.background;

		}

	}

	updateFog( scene ) {

		const sceneData = this.get( scene );
		const fog = scene.fog;

		if ( fog ) {

			if ( sceneData.fog !== fog ) {

				let fogNode = null;

				if ( fog.isFogExp2 ) {

					fogNode = densityFog( reference( 'color', 'color', fog ), reference( 'density', 'float', fog ) );

				} else if ( fog.isFog ) {

					fogNode = rangeFog( reference( 'color', 'color', fog ), reference( 'near', 'float', fog ), reference( 'far', 'float', fog ) );

				} else {

					console.error( 'WebGPUNodes: Unsupported fog configuration.', fog );

				}

				sceneData.fogNode = fogNode;
				sceneData.fog = fog;

			}

		} else {

			delete sceneData.fogNode;
			delete sceneData.fog;

		}

	}

	updateEnvironment( scene ) {

		const sceneData = this.get( scene );
		const environment = scene.environment;

		if ( environment ) {

			if ( sceneData.environment !== environment ) {

				let environmentNode = null;

				if ( environment.isCubeTexture === true ) {

					environmentNode = cubeTexture( environment );

				} else if ( environment.isTexture === true ) {

					environmentNode = texture( environment );

				} else {

					console.error( 'Nodes: Unsupported environment configuration.', environment );

				}

				sceneData.environmentNode = environmentNode;
				sceneData.environment = environment;

			}

		} else if ( sceneData.environmentNode ) {

			delete sceneData.environmentNode;
			delete sceneData.environment;

		}

	}

	getNodeFrame( renderer = this.renderer, scene = null, object = null, camera = null, material = null ) {

		const nodeFrame = this.nodeFrame;
		nodeFrame.renderer = renderer;
		nodeFrame.scene = scene;
		nodeFrame.object = object;
		nodeFrame.camera = camera;
		nodeFrame.material = material;

		return nodeFrame;

	}

	getNodeFrameForRender( renderObject ) {

		return this.getNodeFrame( renderObject.renderer, renderObject.scene, renderObject.object, renderObject.camera, renderObject.material );

	}

	getOutputCacheKey() {

		const renderer = this.renderer;

		return renderer.toneMapping + ',' + renderer.currentColorSpace;

	}

	hasOutputChange( outputTarget ) {

		const cacheKey = outputNodeMap.get( outputTarget );

		return cacheKey !== this.getOutputCacheKey();

	}

	getOutputNode( outputTexture ) {

		const renderer = this.renderer;
		const cacheKey = this.getOutputCacheKey();

		const output = texture( outputTexture, viewportTopLeft ).renderOutput( renderer.toneMapping, renderer.currentColorSpace );

		outputNodeMap.set( outputTexture, cacheKey );

		return output;

	}

	updateBefore( renderObject ) {

		const nodeFrame = this.getNodeFrameForRender( renderObject );
		const nodeBuilder = renderObject.getNodeBuilderState();

		for ( const node of nodeBuilder.updateBeforeNodes ) {

			nodeFrame.updateBeforeNode( node );

		}

	}

	updateAfter( renderObject ) {

		const nodeFrame = this.getNodeFrameForRender( renderObject );
		const nodeBuilder = renderObject.getNodeBuilderState();

		for ( const node of nodeBuilder.updateAfterNodes ) {

			nodeFrame.updateAfterNode( node );

		}

	}

	updateForCompute( computeNode ) {

		const nodeFrame = this.getNodeFrame();
		const nodeBuilder = this.getForCompute( computeNode );

		for ( const node of nodeBuilder.updateNodes ) {

			nodeFrame.updateNode( node );

		}

	}

	updateForRender( renderObject ) {

		const nodeFrame = this.getNodeFrameForRender( renderObject );
		const nodeBuilder = renderObject.getNodeBuilderState();

		for ( const node of nodeBuilder.updateNodes ) {

			nodeFrame.updateNode( node );

		}

	}

	dispose() {

		super.dispose();

		this.nodeFrame = new NodeFrame();
		this.nodeBuilderCache = new Map();

	}

}

class RenderBundle {

	constructor( scene, camera ) {

		this.scene = scene;
		this.camera = camera;

	}

	clone() {

		return Object.assign( new this.constructor(), this );

	}

}

class RenderBundles {

	constructor() {

		this.lists = new ChainMap();

	}

	get( scene, camera ) {

		const lists = this.lists;
		const keys = [ scene, camera ];

		let list = lists.get( keys );

		if ( list === undefined ) {

			list = new RenderBundle( scene, camera );
			lists.set( keys, list );

		}

		return list;

	}

	dispose() {

		this.lists = new ChainMap();

	}

}

const _scene = new Scene();
const _drawingBufferSize = new Vector2();
const _screen = new Vector4();
const _frustum = new Frustum();
const _projScreenMatrix = new Matrix4();
const _vector3 = new Vector3();

class Renderer {

	constructor( backend, parameters = {} ) {

		this.isRenderer = true;

		//

		const {
			logarithmicDepthBuffer = false,
			alpha = true,
			antialias = false,
			samples = 0
		} = parameters;

		// public
		this.domElement = backend.getDomElement();

		this.backend = backend;

		this.samples = samples || ( antialias === true ) ? 4 : 0;

		this.autoClear = true;
		this.autoClearColor = true;
		this.autoClearDepth = true;
		this.autoClearStencil = true;

		this.alpha = alpha;

		this.logarithmicDepthBuffer = logarithmicDepthBuffer;

		this.outputColorSpace = SRGBColorSpace;

		this.toneMapping = NoToneMapping;
		this.toneMappingExposure = 1.0;

		this.sortObjects = true;

		this.depth = true;
		this.stencil = false;

		this.clippingPlanes = [];

		this.info = new Info();

		// internals

		this._pixelRatio = 1;
		this._width = this.domElement.width;
		this._height = this.domElement.height;

		this._viewport = new Vector4( 0, 0, this._width, this._height );
		this._scissor = new Vector4( 0, 0, this._width, this._height );
		this._scissorTest = false;

		this._attributes = null;
		this._geometries = null;
		this._nodes = null;
		this._animation = null;
		this._bindings = null;
		this._objects = null;
		this._pipelines = null;
		this._bundles = null;
		this._renderLists = null;
		this._renderContexts = null;
		this._textures = null;
		this._background = null;

		this._quad = new QuadMesh( new NodeMaterial() );

		this._currentRenderContext = null;

		this._opaqueSort = null;
		this._transparentSort = null;

		this._frameBufferTarget = null;

		const alphaClear = this.alpha === true ? 0 : 1;

		this._clearColor = new Color4( 0, 0, 0, alphaClear );
		this._clearDepth = 1;
		this._clearStencil = 0;

		this._renderTarget = null;
		this._activeCubeFace = 0;
		this._activeMipmapLevel = 0;

		this._renderObjectFunction = null;
		this._currentRenderObjectFunction = null;
		this._currentRenderBundle = null;

		this._handleObjectFunction = this._renderObjectDirect;

		this._initialized = false;
		this._initPromise = null;

		this._compilationPromises = null;

		// backwards compatibility

		this.shadowMap = {
			enabled: false,
			type: null
		};

		this.xr = {
			enabled: false
		};

		this.debug = {
			checkShaderErrors: true,
			onShaderError: null
		};

	}

	async init() {

		if ( this._initialized ) {

			throw new Error( 'Renderer: Backend has already been initialized.' );

		}

		if ( this._initPromise !== null ) {

			return this._initPromise;

		}

		this._initPromise = new Promise( async ( resolve, reject ) => {

			const backend = this.backend;

			try {

				await backend.init( this );

			} catch ( error ) {

				reject( error );
				return;

			}

			this._nodes = new Nodes( this, backend );
			this._animation = new Animation( this._nodes, this.info );
			this._attributes = new Attributes( backend );
			this._background = new Background( this, this._nodes );
			this._geometries = new Geometries( this._attributes, this.info );
			this._textures = new Textures( this, backend, this.info );
			this._pipelines = new Pipelines( backend, this._nodes );
			this._bindings = new Bindings( backend, this._nodes, this._textures, this._attributes, this._pipelines, this.info );
			this._objects = new RenderObjects( this, this._nodes, this._geometries, this._pipelines, this._bindings, this.info );
			this._renderLists = new RenderLists();
			this._bundles = new RenderBundles();
			this._renderContexts = new RenderContexts();

			//

			this._initialized = true;

			resolve();

		} );

		return this._initPromise;

	}

	get coordinateSystem() {

		return this.backend.coordinateSystem;

	}

	async compileAsync( scene, camera, targetScene = null ) {

		if ( this._initialized === false ) await this.init();

		// preserve render tree

		const nodeFrame = this._nodes.nodeFrame;

		const previousRenderId = nodeFrame.renderId;
		const previousRenderContext = this._currentRenderContext;
		const previousRenderObjectFunction = this._currentRenderObjectFunction;
		const previousCompilationPromises = this._compilationPromises;

		//

		const sceneRef = ( scene.isScene === true ) ? scene : _scene;

		if ( targetScene === null ) targetScene = scene;

		const renderTarget = this._renderTarget;
		const renderContext = this._renderContexts.get( targetScene, camera, renderTarget );
		const activeMipmapLevel = this._activeMipmapLevel;

		const compilationPromises = [];

		this._currentRenderContext = renderContext;
		this._currentRenderObjectFunction = this.renderObject;

		this._handleObjectFunction = this._createObjectPipeline;

		this._compilationPromises = compilationPromises;

		nodeFrame.renderId ++;

		//

		nodeFrame.update();

		//

		renderContext.depth = this.depth;
		renderContext.stencil = this.stencil;

		if ( ! renderContext.clippingContext ) renderContext.clippingContext = new ClippingContext();
		renderContext.clippingContext.updateGlobal( this, camera );

		//

		sceneRef.onBeforeRender( this, scene, camera, renderTarget );

		//

		const renderList = this._renderLists.get( scene, camera );
		renderList.begin();

		this._projectObject( scene, camera, 0, renderList );

		// include lights from target scene
		if ( targetScene !== scene ) {

			targetScene.traverseVisible( function ( object ) {

				if ( object.isLight && object.layers.test( camera.layers ) ) {

					renderList.pushLight( object );

				}

			} );

		}

		renderList.finish();

		//

		if ( renderTarget !== null ) {

			this._textures.updateRenderTarget( renderTarget, activeMipmapLevel );

			const renderTargetData = this._textures.get( renderTarget );

			renderContext.textures = renderTargetData.textures;
			renderContext.depthTexture = renderTargetData.depthTexture;

		} else {

			renderContext.textures = null;
			renderContext.depthTexture = null;

		}

		//

		this._nodes.updateScene( sceneRef );

		//

		this._background.update( sceneRef, renderList, renderContext );

		// process render lists

		const opaqueObjects = renderList.opaque;
		const transparentObjects = renderList.transparent;
		const lightsNode = renderList.lightsNode;

		if ( opaqueObjects.length > 0 ) this._renderObjects( opaqueObjects, camera, sceneRef, lightsNode );
		if ( transparentObjects.length > 0 ) this._renderObjects( transparentObjects, camera, sceneRef, lightsNode );

		// restore render tree

		nodeFrame.renderId = previousRenderId;

		this._currentRenderContext = previousRenderContext;
		this._currentRenderObjectFunction = previousRenderObjectFunction;
		this._compilationPromises = previousCompilationPromises;

		this._handleObjectFunction = this._renderObjectDirect;

		// wait for all promises setup by backends awaiting compilation/linking/pipeline creation to complete

		await Promise.all( compilationPromises );

	}

	async renderAsync( scene, camera ) {

		if ( this._initialized === false ) await this.init();

		const renderContext = this._renderScene( scene, camera );

		await this.backend.resolveTimestampAsync( renderContext, 'render' );

	}

	_renderBundle( bundle, sceneRef, lightsNode ) {

		const { object, camera, renderList } = bundle;

		const renderContext = this._currentRenderContext;
		const renderContextData = this.backend.get( renderContext );

		//

		const renderBundle = this._bundles.get( object, camera );

		const renderBundleData = this.backend.get( renderBundle );
		if ( renderBundleData.renderContexts === undefined ) renderBundleData.renderContexts = new Set();

		//

		const renderBundleNeedsUpdate = renderBundleData.renderContexts.has( renderContext ) === false || object.needsUpdate === true;

		renderBundleData.renderContexts.add( renderContext );

		if ( renderBundleNeedsUpdate ) {

			if ( renderContextData.renderObjects === undefined || object.needsUpdate === true ) {

				const nodeFrame = this._nodes.nodeFrame;

				renderContextData.renderObjects = [];
				renderContextData.renderBundles = [];
				renderContextData.scene = sceneRef;
				renderContextData.camera = camera;
				renderContextData.renderId = nodeFrame.renderId;

				renderContextData.registerBundlesPhase = true;

			}

			this._currentRenderBundle = renderBundle;

			const opaqueObjects = renderList.opaque;

			if ( opaqueObjects.length > 0 ) this._renderObjects( opaqueObjects, camera, sceneRef, lightsNode );

			this._currentRenderBundle = null;

			//

			object.needsUpdate = false;

		} else {

			const renderContext = this._currentRenderContext;
			const renderContextData = this.backend.get( renderContext );

			for ( let i = 0, l = renderContextData.renderObjects.length; i < l; i ++ ) {

				const renderObject = renderContextData.renderObjects[ i ];

				this._nodes.updateBefore( renderObject );

				//

				renderObject.object.modelViewMatrix.multiplyMatrices( camera.matrixWorldInverse, renderObject.object.matrixWorld );
				renderObject.object.normalMatrix.getNormalMatrix( renderObject.object.modelViewMatrix );

				this._nodes.updateForRender( renderObject );
				this._bindings.updateForRender( renderObject );

				this.backend.draw( renderObject, this.info );

				this._nodes.updateAfter( renderObject );

			}

		}

	}

	render( scene, camera ) {

		if ( this._initialized === false ) {

			console.warn( 'THREE.Renderer: .render() called before the backend is initialized. Try using .renderAsync() instead.' );

			return this.renderAsync( scene, camera );

		}

		this._renderScene( scene, camera );

	}

	_getFrameBufferTarget() {

		const { currentColorSpace } = this;

		const useToneMapping = this._renderTarget === null && ( this.toneMapping !== NoToneMapping );
		const useColorSpace = currentColorSpace !== LinearSRGBColorSpace && currentColorSpace !== NoColorSpace;

		if ( useToneMapping === false && useColorSpace === false ) return null;

		const { width, height } = this.getDrawingBufferSize( _drawingBufferSize );
		const { depth, stencil } = this;

		let frameBufferTarget = this._frameBufferTarget;

		if ( frameBufferTarget === null ) {

			frameBufferTarget = new RenderTarget( width, height, {
				depthBuffer: depth,
				stencilBuffer: stencil,
				type: HalfFloatType, // FloatType
				format: RGBAFormat,
				colorSpace: LinearSRGBColorSpace,
				generateMipmaps: false,
				minFilter: LinearFilter,
				magFilter: LinearFilter,
				samples: this.samples
			} );

			frameBufferTarget.isPostProcessingRenderTarget = true;

			this._frameBufferTarget = frameBufferTarget;

		}

		frameBufferTarget.depthBuffer = depth;
		frameBufferTarget.stencilBuffer = stencil;
		frameBufferTarget.setSize( width, height );
		frameBufferTarget.viewport.copy( this._viewport );
		frameBufferTarget.scissor.copy( this._scissor );
		frameBufferTarget.viewport.multiplyScalar( this._pixelRatio );
		frameBufferTarget.scissor.multiplyScalar( this._pixelRatio );
		frameBufferTarget.scissorTest = this._scissorTest;

		return frameBufferTarget;

	}

	_renderScene( scene, camera, useFrameBufferTarget = true ) {

		const frameBufferTarget = useFrameBufferTarget ? this._getFrameBufferTarget() : null;

		// preserve render tree

		const nodeFrame = this._nodes.nodeFrame;

		const previousRenderId = nodeFrame.renderId;
		const previousRenderContext = this._currentRenderContext;
		const previousRenderObjectFunction = this._currentRenderObjectFunction;

		//

		const sceneRef = ( scene.isScene === true ) ? scene : _scene;

		const outputRenderTarget = this._renderTarget;

		const activeCubeFace = this._activeCubeFace;
		const activeMipmapLevel = this._activeMipmapLevel;

		//

		let renderTarget;

		if ( frameBufferTarget !== null ) {

			renderTarget = frameBufferTarget;

			this.setRenderTarget( renderTarget );

		} else {

			renderTarget = outputRenderTarget;

		}

		//

		const renderContext = this._renderContexts.get( scene, camera, renderTarget );

		this._currentRenderContext = renderContext;
		this._currentRenderObjectFunction = this._renderObjectFunction || this.renderObject;

		//

		this.info.calls ++;
		this.info.render.calls ++;
		this.info.render.frameCalls ++;

		nodeFrame.renderId = this.info.calls;

		//

		const coordinateSystem = this.coordinateSystem;

		if ( camera.coordinateSystem !== coordinateSystem ) {

			camera.coordinateSystem = coordinateSystem;

			camera.updateProjectionMatrix();

		}

		//

		if ( scene.matrixWorldAutoUpdate === true ) scene.updateMatrixWorld();

		if ( camera.parent === null && camera.matrixWorldAutoUpdate === true ) camera.updateMatrixWorld();

		//

		let viewport = this._viewport;
		let scissor = this._scissor;
		let pixelRatio = this._pixelRatio;

		if ( renderTarget !== null ) {

			viewport = renderTarget.viewport;
			scissor = renderTarget.scissor;
			pixelRatio = 1;

		}

		this.getDrawingBufferSize( _drawingBufferSize );

		_screen.set( 0, 0, _drawingBufferSize.width, _drawingBufferSize.height );

		const minDepth = ( viewport.minDepth === undefined ) ? 0 : viewport.minDepth;
		const maxDepth = ( viewport.maxDepth === undefined ) ? 1 : viewport.maxDepth;

		renderContext.viewportValue.copy( viewport ).multiplyScalar( pixelRatio ).floor();
		renderContext.viewportValue.width >>= activeMipmapLevel;
		renderContext.viewportValue.height >>= activeMipmapLevel;
		renderContext.viewportValue.minDepth = minDepth;
		renderContext.viewportValue.maxDepth = maxDepth;
		renderContext.viewport = renderContext.viewportValue.equals( _screen ) === false;

		renderContext.scissorValue.copy( scissor ).multiplyScalar( pixelRatio ).floor();
		renderContext.scissor = this._scissorTest && renderContext.scissorValue.equals( _screen ) === false;
		renderContext.scissorValue.width >>= activeMipmapLevel;
		renderContext.scissorValue.height >>= activeMipmapLevel;

		if ( ! renderContext.clippingContext ) renderContext.clippingContext = new ClippingContext();
		renderContext.clippingContext.updateGlobal( this, camera );

		//

		sceneRef.onBeforeRender( this, scene, camera, renderTarget );

		//

		_projScreenMatrix.multiplyMatrices( camera.projectionMatrix, camera.matrixWorldInverse );
		_frustum.setFromProjectionMatrix( _projScreenMatrix, coordinateSystem );

		const renderList = this._renderLists.get( scene, camera );
		renderList.begin();

		this._projectObject( scene, camera, 0, renderList );

		renderList.finish();

		if ( this.sortObjects === true ) {

			renderList.sort( this._opaqueSort, this._transparentSort );

		}

		//

		if ( renderTarget !== null ) {

			this._textures.updateRenderTarget( renderTarget, activeMipmapLevel );

			const renderTargetData = this._textures.get( renderTarget );

			renderContext.textures = renderTargetData.textures;
			renderContext.depthTexture = renderTargetData.depthTexture;
			renderContext.width = renderTargetData.width;
			renderContext.height = renderTargetData.height;
			renderContext.renderTarget = renderTarget;
			renderContext.depth = renderTarget.depthBuffer;
			renderContext.stencil = renderTarget.stencilBuffer;

		} else {

			renderContext.textures = null;
			renderContext.depthTexture = null;
			renderContext.width = this.domElement.width;
			renderContext.height = this.domElement.height;
			renderContext.depth = this.depth;
			renderContext.stencil = this.stencil;

		}

		renderContext.width >>= activeMipmapLevel;
		renderContext.height >>= activeMipmapLevel;
		renderContext.activeCubeFace = activeCubeFace;
		renderContext.activeMipmapLevel = activeMipmapLevel;
		renderContext.occlusionQueryCount = renderList.occlusionQueryCount;

		//

		this._nodes.updateScene( sceneRef );

		//

		this._background.update( sceneRef, renderList, renderContext );

		//

		this.backend.beginRender( renderContext );

		// process render lists

		const opaqueObjects = renderList.opaque;
		const transparentObjects = renderList.transparent;
		const bundles = renderList.bundles;
		const lightsNode = renderList.lightsNode;

		if ( bundles.length > 0 ) this._renderBundles( bundles, sceneRef, lightsNode );
		if ( opaqueObjects.length > 0 ) this._renderObjects( opaqueObjects, camera, sceneRef, lightsNode );
		if ( transparentObjects.length > 0 ) this._renderObjects( transparentObjects, camera, sceneRef, lightsNode );

		// finish render pass

		this.backend.finishRender( renderContext );

		// restore render tree

		nodeFrame.renderId = previousRenderId;

		this._currentRenderContext = previousRenderContext;
		this._currentRenderObjectFunction = previousRenderObjectFunction;

		//

		if ( frameBufferTarget !== null ) {

			this.setRenderTarget( outputRenderTarget, activeCubeFace, activeMipmapLevel );

			const quad = this._quad;

			if ( this._nodes.hasOutputChange( renderTarget.texture ) ) {

				quad.material.fragmentNode = this._nodes.getOutputNode( renderTarget.texture );
				quad.material.needsUpdate = true;

			}

			this._renderScene( quad, quad.camera, false );

		}

		//

		sceneRef.onAfterRender( this, scene, camera, renderTarget );

		//

		return renderContext;

	}

	getMaxAnisotropy() {

		return this.backend.getMaxAnisotropy();

	}

	getActiveCubeFace() {

		return this._activeCubeFace;

	}

	getActiveMipmapLevel() {

		return this._activeMipmapLevel;

	}

	async setAnimationLoop( callback ) {

		if ( this._initialized === false ) await this.init();

		this._animation.setAnimationLoop( callback );

	}

	async getArrayBufferAsync( attribute ) {

		return await this.backend.getArrayBufferAsync( attribute );

	}

	getContext() {

		return this.backend.getContext();

	}

	getPixelRatio() {

		return this._pixelRatio;

	}

	getDrawingBufferSize( target ) {

		return target.set( this._width * this._pixelRatio, this._height * this._pixelRatio ).floor();

	}

	getSize( target ) {

		return target.set( this._width, this._height );

	}

	setPixelRatio( value = 1 ) {

		this._pixelRatio = value;

		this.setSize( this._width, this._height, false );

	}

	setDrawingBufferSize( width, height, pixelRatio ) {

		this._width = width;
		this._height = height;

		this._pixelRatio = pixelRatio;

		this.domElement.width = Math.floor( width * pixelRatio );
		this.domElement.height = Math.floor( height * pixelRatio );

		this.setViewport( 0, 0, width, height );

		if ( this._initialized ) this.backend.updateSize();

	}

	setSize( width, height, updateStyle = true ) {

		this._width = width;
		this._height = height;

		this.domElement.width = Math.floor( width * this._pixelRatio );
		this.domElement.height = Math.floor( height * this._pixelRatio );

		if ( updateStyle === true ) {

			this.domElement.style.width = width + 'px';
			this.domElement.style.height = height + 'px';

		}

		this.setViewport( 0, 0, width, height );

		if ( this._initialized ) this.backend.updateSize();

	}

	setOpaqueSort( method ) {

		this._opaqueSort = method;

	}

	setTransparentSort( method ) {

		this._transparentSort = method;

	}

	getScissor( target ) {

		const scissor = this._scissor;

		target.x = scissor.x;
		target.y = scissor.y;
		target.width = scissor.width;
		target.height = scissor.height;

		return target;

	}

	setScissor( x, y, width, height ) {

		const scissor = this._scissor;

		if ( x.isVector4 ) {

			scissor.copy( x );

		} else {

			scissor.set( x, y, width, height );

		}

	}

	getScissorTest() {

		return this._scissorTest;

	}

	setScissorTest( boolean ) {

		this._scissorTest = boolean;

		this.backend.setScissorTest( boolean );

	}

	getViewport( target ) {

		return target.copy( this._viewport );

	}

	setViewport( x, y, width, height, minDepth = 0, maxDepth = 1 ) {

		const viewport = this._viewport;

		if ( x.isVector4 ) {

			viewport.copy( x );

		} else {

			viewport.set( x, y, width, height );

		}

		viewport.minDepth = minDepth;
		viewport.maxDepth = maxDepth;

	}

	getClearColor( target ) {

		return target.copy( this._clearColor );

	}

	setClearColor( color, alpha = 1 ) {

		this._clearColor.set( color );
		this._clearColor.a = alpha;

	}

	getClearAlpha() {

		return this._clearColor.a;

	}

	setClearAlpha( alpha ) {

		this._clearColor.a = alpha;

	}

	getClearDepth() {

		return this._clearDepth;

	}

	setClearDepth( depth ) {

		this._clearDepth = depth;

	}

	getClearStencil() {

		return this._clearStencil;

	}

	setClearStencil( stencil ) {

		this._clearStencil = stencil;

	}

	isOccluded( object ) {

		const renderContext = this._currentRenderContext;

		return renderContext && this.backend.isOccluded( renderContext, object );

	}

	clear( color = true, depth = true, stencil = true ) {

		if ( this._initialized === false ) {

			console.warn( 'THREE.Renderer: .clear() called before the backend is initialized. Try using .clearAsync() instead.' );

			return this.clearAsync( color, depth, stencil );

		}

		const renderTarget = this._renderTarget || this._getFrameBufferTarget();

		let renderTargetData = null;

		if ( renderTarget !== null ) {

			this._textures.updateRenderTarget( renderTarget );

			renderTargetData = this._textures.get( renderTarget );

		}

		this.backend.clear( color, depth, stencil, renderTargetData );

		if ( renderTarget !== null && this._renderTarget === null ) {

			// If a color space transform or tone mapping is required,
			// the clear operation clears the intermediate renderTarget texture, but does not update the screen canvas.

			const quad = this._quad;

			if ( this._nodes.hasOutputChange( renderTarget.texture ) ) {

				quad.material.fragmentNode = this._nodes.getOutputNode( renderTarget.texture );
				quad.material.needsUpdate = true;

			}

			this._renderScene( quad, quad.camera, false );

		}

	}

	clearColor() {

		return this.clear( true, false, false );

	}

	clearDepth() {

		return this.clear( false, true, false );

	}

	clearStencil() {

		return this.clear( false, false, true );

	}

	async clearAsync( color = true, depth = true, stencil = true ) {

		if ( this._initialized === false ) await this.init();

		this.clear( color, depth, stencil );

	}

	clearColorAsync() {

		return this.clearAsync( true, false, false );

	}

	clearDepthAsync() {

		return this.clearAsync( false, true, false );

	}

	clearStencilAsync() {

		return this.clearAsync( false, false, true );

	}

	get currentColorSpace() {

		const renderTarget = this._renderTarget;

		if ( renderTarget !== null ) {

			const texture = renderTarget.texture;

			return ( Array.isArray( texture ) ? texture[ 0 ] : texture ).colorSpace;

		}

		return this.outputColorSpace;

	}

	dispose() {

		this.info.dispose();

		this._animation.dispose();
		this._objects.dispose();
		this._pipelines.dispose();
		this._nodes.dispose();
		this._bindings.dispose();
		this._renderLists.dispose();
		this._renderContexts.dispose();
		this._textures.dispose();

		this.setRenderTarget( null );
		this.setAnimationLoop( null );

	}

	setRenderTarget( renderTarget, activeCubeFace = 0, activeMipmapLevel = 0 ) {

		this._renderTarget = renderTarget;
		this._activeCubeFace = activeCubeFace;
		this._activeMipmapLevel = activeMipmapLevel;

	}

	getRenderTarget() {

		return this._renderTarget;

	}

	setRenderObjectFunction( renderObjectFunction ) {

		this._renderObjectFunction = renderObjectFunction;

	}

	getRenderObjectFunction() {

		return this._renderObjectFunction;

	}

	async computeAsync( computeNodes ) {

		if ( this._initialized === false ) await this.init();

		const nodeFrame = this._nodes.nodeFrame;

		const previousRenderId = nodeFrame.renderId;

		//

		this.info.calls ++;
		this.info.compute.calls ++;
		this.info.compute.frameCalls ++;

		nodeFrame.renderId = this.info.calls;

		//

		const backend = this.backend;
		const pipelines = this._pipelines;
		const bindings = this._bindings;
		const nodes = this._nodes;

		const computeList = Array.isArray( computeNodes ) ? computeNodes : [ computeNodes ];

		if ( computeList[ 0 ] === undefined || computeList[ 0 ].isComputeNode !== true ) {

			throw new Error( 'THREE.Renderer: .compute() expects a ComputeNode.' );

		}

		backend.beginCompute( computeNodes );

		for ( const computeNode of computeList ) {

			// onInit

			if ( pipelines.has( computeNode ) === false ) {

				const dispose = () => {

					computeNode.removeEventListener( 'dispose', dispose );

					pipelines.delete( computeNode );
					bindings.delete( computeNode );
					nodes.delete( computeNode );

				};

				computeNode.addEventListener( 'dispose', dispose );

				//

				computeNode.onInit( { renderer: this } );

			}

			nodes.updateForCompute( computeNode );
			bindings.updateForCompute( computeNode );

			const computeBindings = bindings.getForCompute( computeNode );
			const computePipeline = pipelines.getForCompute( computeNode, computeBindings );

			backend.compute( computeNodes, computeNode, computeBindings, computePipeline );

		}

		backend.finishCompute( computeNodes );

		await this.backend.resolveTimestampAsync( computeNodes, 'compute' );

		//

		nodeFrame.renderId = previousRenderId;

	}

	async hasFeatureAsync( name ) {

		if ( this._initialized === false ) await this.init();

		return this.backend.hasFeature( name );

	}

	hasFeature( name ) {

		if ( this._initialized === false ) {

			console.warn( 'THREE.Renderer: .hasFeature() called before the backend is initialized. Try using .hasFeatureAsync() instead.' );

			return false;

		}

		return this.backend.hasFeature( name );

	}

	copyFramebufferToTexture( framebufferTexture ) {

		const renderContext = this._currentRenderContext;

		this._textures.updateTexture( framebufferTexture );

		this.backend.copyFramebufferToTexture( framebufferTexture, renderContext );

	}

	copyTextureToTexture( srcTexture, dstTexture, srcRegion = null, dstPosition = null, level = 0 ) {

		this._textures.updateTexture( srcTexture );
		this._textures.updateTexture( dstTexture );

		this.backend.copyTextureToTexture( srcTexture, dstTexture, srcRegion, dstPosition, level );

	}


	readRenderTargetPixelsAsync( renderTarget, x, y, width, height, index = 0 ) {

		return this.backend.copyTextureToBuffer( renderTarget.textures[ index ], x, y, width, height );

	}

	_projectObject( object, camera, groupOrder, renderList ) {

		if ( object.visible === false ) return;

		const visible = object.layers.test( camera.layers );

		if ( visible ) {

			if ( object.isGroup ) {

				groupOrder = object.renderOrder;

			} else if ( object.isLOD ) {

				if ( object.autoUpdate === true ) object.update( camera );

			} else if ( object.isLight ) {

				renderList.pushLight( object );

			} else if ( object.isSprite ) {

				if ( ! object.frustumCulled || _frustum.intersectsSprite( object ) ) {

					if ( this.sortObjects === true ) {

						_vector3.setFromMatrixPosition( object.matrixWorld ).applyMatrix4( _projScreenMatrix );

					}

					const geometry = object.geometry;
					const material = object.material;

					if ( material.visible ) {

						renderList.push( object, geometry, material, groupOrder, _vector3.z, null );

					}

				}

			} else if ( object.isLineLoop ) {

				console.error( 'THREE.Renderer: Objects of type THREE.LineLoop are not supported. Please use THREE.Line or THREE.LineSegments.' );

			} else if ( object.isMesh || object.isLine || object.isPoints ) {

				if ( ! object.frustumCulled || _frustum.intersectsObject( object ) ) {

					const geometry = object.geometry;
					const material = object.material;

					if ( this.sortObjects === true ) {

						if ( geometry.boundingSphere === null ) geometry.computeBoundingSphere();

						_vector3
							.copy( geometry.boundingSphere.center )
							.applyMatrix4( object.matrixWorld )
							.applyMatrix4( _projScreenMatrix );

					}

					if ( Array.isArray( material ) ) {

						const groups = geometry.groups;

						for ( let i = 0, l = groups.length; i < l; i ++ ) {

							const group = groups[ i ];
							const groupMaterial = material[ group.materialIndex ];

							if ( groupMaterial && groupMaterial.visible ) {

								renderList.push( object, geometry, groupMaterial, groupOrder, _vector3.z, group );

							}

						}

					} else if ( material.visible ) {

						renderList.push( object, geometry, material, groupOrder, _vector3.z, null );

					}

				}

			}

		}

		if ( object.static === true ) {

			const baseRenderList = renderList;

			// replace render list
			renderList = this._renderLists.get( object, camera );

			renderList.begin();

			baseRenderList.pushBundle( {
				object,
				camera,
				renderList,
			} );

			renderList.finish();

		}

		const children = object.children;

		for ( let i = 0, l = children.length; i < l; i ++ ) {

			this._projectObject( children[ i ], camera, groupOrder, renderList );

		}

	}

	_renderBundles( bundles, sceneRef, lightsNode ) {

		for ( const bundle of bundles ) {

			this._renderBundle( bundle, sceneRef, lightsNode );

		}

	}

	_renderObjects( renderList, camera, scene, lightsNode ) {

		// process renderable objects

		for ( let i = 0, il = renderList.length; i < il; i ++ ) {

			const renderItem = renderList[ i ];

			// @TODO: Add support for multiple materials per object. This will require to extract
			// the material from the renderItem object and pass it with its group data to renderObject().

			const { object, geometry, material, group } = renderItem;

			if ( camera.isArrayCamera ) {

				const cameras = camera.cameras;

				for ( let j = 0, jl = cameras.length; j < jl; j ++ ) {

					const camera2 = cameras[ j ];

					if ( object.layers.test( camera2.layers ) ) {

						const vp = camera2.viewport;
						const minDepth = ( vp.minDepth === undefined ) ? 0 : vp.minDepth;
						const maxDepth = ( vp.maxDepth === undefined ) ? 1 : vp.maxDepth;

						const viewportValue = this._currentRenderContext.viewportValue;
						viewportValue.copy( vp ).multiplyScalar( this._pixelRatio ).floor();
						viewportValue.minDepth = minDepth;
						viewportValue.maxDepth = maxDepth;

						this.backend.updateViewport( this._currentRenderContext );

						this._currentRenderObjectFunction( object, scene, camera2, geometry, material, group, lightsNode );

					}

				}

			} else {

				this._currentRenderObjectFunction( object, scene, camera, geometry, material, group, lightsNode );

			}

		}

	}

	renderObject( object, scene, camera, geometry, material, group, lightsNode ) {

		let overridePositionNode;
		let overrideFragmentNode;
		let overrideDepthNode;

		//

		object.onBeforeRender( this, scene, camera, geometry, material, group );

		//

		if ( scene.overrideMaterial !== null ) {

			const overrideMaterial = scene.overrideMaterial;

			if ( material.positionNode && material.positionNode.isNode ) {

				overridePositionNode = overrideMaterial.positionNode;
				overrideMaterial.positionNode = material.positionNode;

			}

			if ( overrideMaterial.isShadowNodeMaterial ) {

				overrideMaterial.side = material.shadowSide === null ? material.side : material.shadowSide;

				if ( material.depthNode && material.depthNode.isNode ) {

					overrideDepthNode = overrideMaterial.depthNode;
					overrideMaterial.depthNode = material.depthNode;

				}


				if ( material.shadowNode && material.shadowNode.isNode ) {

					overrideFragmentNode = overrideMaterial.fragmentNode;
					overrideMaterial.fragmentNode = material.shadowNode;

				}

				if ( this.localClippingEnabled ) {

					if ( material.clipShadows ) {

						if ( overrideMaterial.clippingPlanes !== material.clippingPlanes ) {

							overrideMaterial.clippingPlanes = material.clippingPlanes;
							overrideMaterial.needsUpdate = true;

						}

						if ( overrideMaterial.clipIntersection !== material.clipIntersection ) {

							overrideMaterial.clipIntersection = material.clipIntersection;

						}

					} else if ( Array.isArray( overrideMaterial.clippingPlanes ) ) {

						overrideMaterial.clippingPlanes = null;
						overrideMaterial.needsUpdate = true;

					}

				}

			}

			material = overrideMaterial;

		}

		//

		if ( material.transparent === true && material.side === DoubleSide && material.forceSinglePass === false ) {

			material.side = BackSide;
			this._handleObjectFunction( object, material, scene, camera, lightsNode, group, 'backSide' ); // create backSide pass id

			material.side = FrontSide;
			this._handleObjectFunction( object, material, scene, camera, lightsNode, group ); // use default pass id

			material.side = DoubleSide;

		} else {

			this._handleObjectFunction( object, material, scene, camera, lightsNode, group );

		}

		//

		if ( overridePositionNode !== undefined ) {

			scene.overrideMaterial.positionNode = overridePositionNode;

		}

		if ( overrideDepthNode !== undefined ) {

			scene.overrideMaterial.depthNode = overrideDepthNode;

		}

		if ( overrideFragmentNode !== undefined ) {

			scene.overrideMaterial.fragmentNode = overrideFragmentNode;

		}

		//

		object.onAfterRender( this, scene, camera, geometry, material, group );

	}

	_renderObjectDirect( object, material, scene, camera, lightsNode, group, passId ) {

		const renderObject = this._objects.get( object, material, scene, camera, lightsNode, this._currentRenderContext, passId );
		renderObject.drawRange = group || object.geometry.drawRange;

		//

		this._nodes.updateBefore( renderObject );

		//

		object.modelViewMatrix.multiplyMatrices( camera.matrixWorldInverse, object.matrixWorld );
		object.normalMatrix.getNormalMatrix( object.modelViewMatrix );

		//

		this._nodes.updateForRender( renderObject );
		this._geometries.updateForRender( renderObject );
		this._bindings.updateForRender( renderObject );
		this._pipelines.updateForRender( renderObject );

		//

		if ( this._currentRenderBundle !== null && this._currentRenderBundle.needsUpdate === true ) {

			const renderObjectData = this.backend.get( renderObject );

			renderObjectData.bundleEncoder = undefined;
			renderObjectData.lastPipelineGPU = undefined;

		}

		this.backend.draw( renderObject, this.info );

		if ( this._currentRenderBundle !== null ) {

			const renderContextData = this.backend.get( this._currentRenderContext );

			renderContextData.renderObjects.push( renderObject );

		}

		this._nodes.updateAfter( renderObject );

	}

	_createObjectPipeline( object, material, scene, camera, lightsNode, passId ) {

		const renderObject = this._objects.get( object, material, scene, camera, lightsNode, this._currentRenderContext, passId );

		//

		this._nodes.updateBefore( renderObject );

		//

		this._nodes.updateForRender( renderObject );
		this._geometries.updateForRender( renderObject );
		this._bindings.updateForRender( renderObject );

		this._pipelines.getForRender( renderObject, this._compilationPromises );

		this._nodes.updateAfter( renderObject );

	}

	get compute() {

		return this.computeAsync;

	}

	get compile() {

		return this.compileAsync;

	}

}

class Binding {

	constructor( name = '' ) {

		this.name = name;

		this.visibility = 0;

	}

	setVisibility( visibility ) {

		this.visibility |= visibility;

	}

	clone() {

		return Object.assign( new this.constructor(), this );

	}

}

function getFloatLength( floatLength ) {

	// ensure chunk size alignment (STD140 layout)

	return floatLength + ( ( GPU_CHUNK_BYTES - ( floatLength % GPU_CHUNK_BYTES ) ) % GPU_CHUNK_BYTES );

}

class Buffer extends Binding {

	constructor( name, buffer = null ) {

		super( name );

		this.isBuffer = true;

		this.bytesPerElement = Float32Array.BYTES_PER_ELEMENT;

		this._buffer = buffer;

	}

	get byteLength() {

		return getFloatLength( this._buffer.byteLength );

	}

	get buffer() {

		return this._buffer;

	}

	update() {

		return true;

	}

}

class UniformBuffer extends Buffer {

	constructor( name, buffer = null ) {

		super( name, buffer );

		this.isUniformBuffer = true;

	}

}

let _id$2 = 0;

class NodeUniformBuffer extends UniformBuffer {

	constructor( nodeUniform, groupNode ) {

		super( 'UniformBuffer_' + _id$2 ++, nodeUniform ? nodeUniform.value : null );

		this.nodeUniform = nodeUniform;
		this.groupNode = groupNode;

	}

	get buffer() {

		return this.nodeUniform.value;

	}

}

class UniformsGroup extends UniformBuffer {

	constructor( name ) {

		super( name );

		this.isUniformsGroup = true;

		this._values = null;

		// the order of uniforms in this array must match the order of uniforms in the shader

		this.uniforms = [];

	}

	addUniform( uniform ) {

		this.uniforms.push( uniform );

		return this;

	}

	removeUniform( uniform ) {

		const index = this.uniforms.indexOf( uniform );

		if ( index !== - 1 ) {

			this.uniforms.splice( index, 1 );

		}

		return this;

	}

	get values() {

		if ( this._values === null ) {

			this._values = Array.from( this.buffer );

		}

		return this._values;

	}

	get buffer() {

		let buffer = this._buffer;

		if ( buffer === null ) {

			const byteLength = this.byteLength;

			buffer = new Float32Array( new ArrayBuffer( byteLength ) );

			this._buffer = buffer;

		}

		return buffer;

	}

	get byteLength() {

		let offset = 0; // global buffer offset in bytes

		for ( let i = 0, l = this.uniforms.length; i < l; i ++ ) {

			const uniform = this.uniforms[ i ];

			const { boundary, itemSize } = uniform;

			// offset within a single chunk in bytes

			const chunkOffset = offset % GPU_CHUNK_BYTES;
			const remainingSizeInChunk = GPU_CHUNK_BYTES - chunkOffset;

			// conformance tests

			if ( chunkOffset !== 0 && ( remainingSizeInChunk - boundary ) < 0 ) {

				// check for chunk overflow

				offset += ( GPU_CHUNK_BYTES - chunkOffset );

			} else if ( chunkOffset % boundary !== 0 ) {

				// check for correct alignment

				offset += ( chunkOffset % boundary );

			}

			uniform.offset = ( offset / this.bytesPerElement );

			offset += ( itemSize * this.bytesPerElement );

		}

		return Math.ceil( offset / GPU_CHUNK_BYTES ) * GPU_CHUNK_BYTES;

	}

	update() {

		let updated = false;

		for ( const uniform of this.uniforms ) {

			if ( this.updateByType( uniform ) === true ) {

				updated = true;

			}

		}

		return updated;

	}

	updateByType( uniform ) {

		if ( uniform.isNumberUniform ) return this.updateNumber( uniform );
		if ( uniform.isVector2Uniform ) return this.updateVector2( uniform );
		if ( uniform.isVector3Uniform ) return this.updateVector3( uniform );
		if ( uniform.isVector4Uniform ) return this.updateVector4( uniform );
		if ( uniform.isColorUniform ) return this.updateColor( uniform );
		if ( uniform.isMatrix3Uniform ) return this.updateMatrix3( uniform );
		if ( uniform.isMatrix4Uniform ) return this.updateMatrix4( uniform );

		console.error( 'THREE.WebGPUUniformsGroup: Unsupported uniform type.', uniform );

	}

	updateNumber( uniform ) {

		let updated = false;

		const a = this.values;
		const v = uniform.getValue();
		const offset = uniform.offset;

		if ( a[ offset ] !== v ) {

			const b = this.buffer;

			b[ offset ] = a[ offset ] = v;
			updated = true;

		}

		return updated;

	}

	updateVector2( uniform ) {

		let updated = false;

		const a = this.values;
		const v = uniform.getValue();
		const offset = uniform.offset;

		if ( a[ offset + 0 ] !== v.x || a[ offset + 1 ] !== v.y ) {

			const b = this.buffer;

			b[ offset + 0 ] = a[ offset + 0 ] = v.x;
			b[ offset + 1 ] = a[ offset + 1 ] = v.y;

			updated = true;

		}

		return updated;

	}

	updateVector3( uniform ) {

		let updated = false;

		const a = this.values;
		const v = uniform.getValue();
		const offset = uniform.offset;

		if ( a[ offset + 0 ] !== v.x || a[ offset + 1 ] !== v.y || a[ offset + 2 ] !== v.z ) {

			const b = this.buffer;

			b[ offset + 0 ] = a[ offset + 0 ] = v.x;
			b[ offset + 1 ] = a[ offset + 1 ] = v.y;
			b[ offset + 2 ] = a[ offset + 2 ] = v.z;

			updated = true;

		}

		return updated;

	}

	updateVector4( uniform ) {

		let updated = false;

		const a = this.values;
		const v = uniform.getValue();
		const offset = uniform.offset;

		if ( a[ offset + 0 ] !== v.x || a[ offset + 1 ] !== v.y || a[ offset + 2 ] !== v.z || a[ offset + 4 ] !== v.w ) {

			const b = this.buffer;

			b[ offset + 0 ] = a[ offset + 0 ] = v.x;
			b[ offset + 1 ] = a[ offset + 1 ] = v.y;
			b[ offset + 2 ] = a[ offset + 2 ] = v.z;
			b[ offset + 3 ] = a[ offset + 3 ] = v.w;

			updated = true;

		}

		return updated;

	}

	updateColor( uniform ) {

		let updated = false;

		const a = this.values;
		const c = uniform.getValue();
		const offset = uniform.offset;

		if ( a[ offset + 0 ] !== c.r || a[ offset + 1 ] !== c.g || a[ offset + 2 ] !== c.b ) {

			const b = this.buffer;

			b[ offset + 0 ] = a[ offset + 0 ] = c.r;
			b[ offset + 1 ] = a[ offset + 1 ] = c.g;
			b[ offset + 2 ] = a[ offset + 2 ] = c.b;

			updated = true;

		}

		return updated;

	}

	updateMatrix3( uniform ) {

		let updated = false;

		const a = this.values;
		const e = uniform.getValue().elements;
		const offset = uniform.offset;

		if ( a[ offset + 0 ] !== e[ 0 ] || a[ offset + 1 ] !== e[ 1 ] || a[ offset + 2 ] !== e[ 2 ] ||
			a[ offset + 4 ] !== e[ 3 ] || a[ offset + 5 ] !== e[ 4 ] || a[ offset + 6 ] !== e[ 5 ] ||
			a[ offset + 8 ] !== e[ 6 ] || a[ offset + 9 ] !== e[ 7 ] || a[ offset + 10 ] !== e[ 8 ] ) {

			const b = this.buffer;

			b[ offset + 0 ] = a[ offset + 0 ] = e[ 0 ];
			b[ offset + 1 ] = a[ offset + 1 ] = e[ 1 ];
			b[ offset + 2 ] = a[ offset + 2 ] = e[ 2 ];
			b[ offset + 4 ] = a[ offset + 4 ] = e[ 3 ];
			b[ offset + 5 ] = a[ offset + 5 ] = e[ 4 ];
			b[ offset + 6 ] = a[ offset + 6 ] = e[ 5 ];
			b[ offset + 8 ] = a[ offset + 8 ] = e[ 6 ];
			b[ offset + 9 ] = a[ offset + 9 ] = e[ 7 ];
			b[ offset + 10 ] = a[ offset + 10 ] = e[ 8 ];

			updated = true;

		}

		return updated;

	}

	updateMatrix4( uniform ) {

		let updated = false;

		const a = this.values;
		const e = uniform.getValue().elements;
		const offset = uniform.offset;

		if ( arraysEqual( a, e, offset ) === false ) {

			const b = this.buffer;
			b.set( e, offset );
			setArray( a, e, offset );
			updated = true;

		}

		return updated;

	}

}

function setArray( a, b, offset ) {

	for ( let i = 0, l = b.length; i < l; i ++ ) {

		a[ offset + i ] = b[ i ];

	}

}

function arraysEqual( a, b, offset ) {

	for ( let i = 0, l = b.length; i < l; i ++ ) {

		if ( a[ offset + i ] !== b[ i ] ) return false;

	}

	return true;

}

let id$1 = 0;

class NodeUniformsGroup extends UniformsGroup {

	constructor( name, groupNode ) {

		super( name );

		this.id = id$1 ++;
		this.groupNode = groupNode;

		this.isNodeUniformsGroup = true;

	}

	getNodes() {

		const nodes = [];

		for ( const uniform of this.uniforms ) {

			const node = uniform.nodeUniform.node;

			if ( ! node ) throw new Error( 'NodeUniformsGroup: Uniform has no node.' );

			nodes.push( node );

		}

		return nodes;

	}

}

let id = 0;

class SampledTexture extends Binding {

	constructor( name, texture ) {

		super( name );

		this.id = id ++;

		this.texture = texture;
		this.version = texture ? texture.version : 0;
		this.store = false;

		this.isSampledTexture = true;

	}

	get needsBindingsUpdate() {

		const { texture, version } = this;

		return texture.isVideoTexture ? true : version !== texture.version; // @TODO: version === 0 && texture.version > 0 ( add it just to External Textures like PNG,JPG )

	}

	update() {

		const { texture, version } = this;

		if ( version !== texture.version ) {

			this.version = texture.version;

			return true;

		}

		return false;

	}

}

class NodeSampledTexture extends SampledTexture {

	constructor( name, textureNode, groupNode, access = null ) {

		super( name, textureNode ? textureNode.value : null );

		this.textureNode = textureNode;
		this.groupNode = groupNode;

		this.access = access;

	}

	get needsBindingsUpdate() {

		return this.textureNode.value !== this.texture || super.needsBindingsUpdate;

	}

	update() {

		const { textureNode } = this;

		if ( this.texture !== textureNode.value ) {

			this.texture = textureNode.value;

			return true;

		}

		return super.update();

	}

}

class NodeSampledCubeTexture extends NodeSampledTexture {

	constructor( name, textureNode, groupNode, access ) {

		super( name, textureNode, groupNode, access );

		this.isSampledCubeTexture = true;

	}

}

class NodeSampledTexture3D extends NodeSampledTexture {

	constructor( name, textureNode, groupNode, access ) {

		super( name, textureNode, groupNode, access );

		this.isSampledTexture3D = true;

	}

}

const glslMethods = {
	[ MathNode.ATAN2 ]: 'atan',
	textureDimensions: 'textureSize',
	equals: 'equal'
};

const precisionLib = {
	low: 'lowp',
	medium: 'mediump',
	high: 'highp'
};

const supports$1 = {
	swizzleAssign: true,
	storageBuffer: false
};

const defaultPrecisions = `
precision highp float;
precision highp int;
precision highp sampler2D;
precision highp sampler3D;
precision highp samplerCube;
precision highp sampler2DArray;

precision highp usampler2D;
precision highp usampler3D;
precision highp usamplerCube;
precision highp usampler2DArray;

precision highp isampler2D;
precision highp isampler3D;
precision highp isamplerCube;
precision highp isampler2DArray;

precision lowp sampler2DShadow;
`;

class GLSLNodeBuilder extends NodeBuilder {

	constructor( object, renderer ) {

		super( object, renderer, new GLSLNodeParser() );

		this.uniformGroups = {};
		this.transforms = [];

		this.instanceBindGroups = false;

	}

	getMethod( method ) {

		return glslMethods[ method ] || method;

	}

	getOutputStructName() {

		return '';

	}

	buildFunctionCode( shaderNode ) {

		const layout = shaderNode.layout;
		const flowData = this.flowShaderNode( shaderNode );

		const parameters = [];

		for ( const input of layout.inputs ) {

			parameters.push( this.getType( input.type ) + ' ' + input.name );

		}

		//

		const code = `${ this.getType( layout.type ) } ${ layout.name }( ${ parameters.join( ', ' ) } ) {

	${ flowData.vars }

${ flowData.code }
	return ${ flowData.result };

}`;

		//

		return code;

	}

	setupPBO( storageBufferNode ) {

		const attribute = storageBufferNode.value;

		if ( attribute.pbo === undefined ) {

			const originalArray = attribute.array;
			const numElements = attribute.count * attribute.itemSize;

			const { itemSize } = attribute;

			const isInteger = attribute.array.constructor.name.toLowerCase().includes( 'int' );

			let format = isInteger ? RedIntegerFormat : RedFormat;


			if ( itemSize === 2 ) {

				format = isInteger ? RGIntegerFormat : RGFormat;

			} else if ( itemSize === 3 ) {

				format = isInteger ? RGBIntegerFormat : RGBFormat;

			} else if ( itemSize === 4 ) {

				format = isInteger ? RGBAIntegerFormat : RGBAFormat;

			}

			const typeMap = {
				Float32Array: FloatType,
				Uint8Array: UnsignedByteType,
				Uint16Array: UnsignedShortType,
				Uint32Array: UnsignedIntType,
				Int8Array: ByteType,
				Int16Array: ShortType,
				Int32Array: IntType,
				Uint8ClampedArray: UnsignedByteType,
			};

			const width = Math.pow( 2, Math.ceil( Math.log2( Math.sqrt( numElements / itemSize ) ) ) );
			let height = Math.ceil( ( numElements / itemSize ) / width );
			if ( width * height * itemSize < numElements ) height ++; // Ensure enough space

			const newSize = width * height * itemSize;

			const newArray = new originalArray.constructor( newSize );

			newArray.set( originalArray, 0 );

			attribute.array = newArray;

			const pboTexture = new DataTexture( attribute.array, width, height, format, typeMap[ attribute.array.constructor.name ] || FloatType );
			pboTexture.needsUpdate = true;
			pboTexture.isPBOTexture = true;

			const pbo = new TextureNode( pboTexture, null, null );
			pbo.setPrecision( 'high' );

			attribute.pboNode = pbo;
			attribute.pbo = pbo.value;

			this.getUniformFromNode( attribute.pboNode, 'texture', this.shaderStage, this.context.label );

		}

	}

	getPropertyName( node, shaderStage = this.shaderStage ) {

		if ( node.isNodeUniform && node.node.isTextureNode !== true && node.node.isBufferNode !== true ) {

			return shaderStage.charAt( 0 ) + '_' + node.name;

		}

		return super.getPropertyName( node, shaderStage );

	}

	generatePBO( storageArrayElementNode ) {

		const { node, indexNode } = storageArrayElementNode;
		const attribute = node.value;

		if ( this.renderer.backend.has( attribute ) ) {

			const attributeData = this.renderer.backend.get( attribute );
			attributeData.pbo = attribute.pbo;

		}


		const nodeUniform = this.getUniformFromNode( attribute.pboNode, 'texture', this.shaderStage, this.context.label );
		const textureName = this.getPropertyName( nodeUniform );

		indexNode.increaseUsage( this ); // force cache generate to be used as index in x,y
		const indexSnippet = indexNode.build( this, 'uint' );

		const elementNodeData = this.getDataFromNode( storageArrayElementNode );

		let propertyName = elementNodeData.propertyName;

		if ( propertyName === undefined ) {

			// property element

			const nodeVar = this.getVarFromNode( storageArrayElementNode );

			propertyName = this.getPropertyName( nodeVar );

			// property size

			const bufferNodeData = this.getDataFromNode( node );

			let propertySizeName = bufferNodeData.propertySizeName;

			if ( propertySizeName === undefined ) {

				propertySizeName = propertyName + 'Size';

				this.getVarFromNode( node, propertySizeName, 'uint' );

				this.addLineFlowCode( `${ propertySizeName } = uint( textureSize( ${ textureName }, 0 ).x )` );

				bufferNodeData.propertySizeName = propertySizeName;

			}

			//

			const { itemSize } = attribute;

			const channel = '.' + vectorComponents.join( '' ).slice( 0, itemSize );
			const uvSnippet = `ivec2(${indexSnippet} % ${ propertySizeName }, ${indexSnippet} / ${ propertySizeName })`;

			const snippet = this.generateTextureLoad( null, textureName, uvSnippet, null, '0' );

			//


			let prefix = 'vec4';

			if ( attribute.pbo.type === UnsignedIntType ) {

				prefix = 'uvec4';

			} else if ( attribute.pbo.type === IntType ) {

				prefix = 'ivec4';

			}

			this.addLineFlowCode( `${ propertyName } = ${prefix}(${ snippet })${channel}` );

			elementNodeData.propertyName = propertyName;

		}

		return propertyName;

	}

	generateTextureLoad( texture, textureProperty, uvIndexSnippet, depthSnippet, levelSnippet = '0' ) {

		if ( depthSnippet ) {

			return `texelFetch( ${ textureProperty }, ivec3( ${ uvIndexSnippet }, ${ depthSnippet } ), ${ levelSnippet } )`;

		} else {

			return `texelFetch( ${ textureProperty }, ${ uvIndexSnippet }, ${ levelSnippet } )`;

		}

	}

	generateTexture( texture, textureProperty, uvSnippet, depthSnippet ) {

		if ( texture.isDepthTexture ) {

			return `texture( ${ textureProperty }, ${ uvSnippet } ).x`;

		} else {

			if ( depthSnippet ) uvSnippet = `vec3( ${ uvSnippet }, ${ depthSnippet } )`;

			return `texture( ${ textureProperty }, ${ uvSnippet } )`;

		}

	}

	generateTextureLevel( texture, textureProperty, uvSnippet, levelSnippet ) {

		return `textureLod( ${ textureProperty }, ${ uvSnippet }, ${ levelSnippet } )`;

	}

	generateTextureBias( texture, textureProperty, uvSnippet, biasSnippet ) {

		return `texture( ${ textureProperty }, ${ uvSnippet }, ${ biasSnippet } )`;

	}

	generateTextureGrad( texture, textureProperty, uvSnippet, gradSnippet ) {

		return `textureGrad( ${ textureProperty }, ${ uvSnippet }, ${ gradSnippet[ 0 ] }, ${ gradSnippet[ 1 ] } )`;

	}

	generateTextureCompare( texture, textureProperty, uvSnippet, compareSnippet, depthSnippet, shaderStage = this.shaderStage ) {

		if ( shaderStage === 'fragment' ) {

			return `texture( ${ textureProperty }, vec3( ${ uvSnippet }, ${ compareSnippet } ) )`;

		} else {

			console.error( `WebGPURenderer: THREE.DepthTexture.compareFunction() does not support ${ shaderStage } shader.` );

		}

	}

	getVars( shaderStage ) {

		const snippets = [];

		const vars = this.vars[ shaderStage ];

		if ( vars !== undefined ) {

			for ( const variable of vars ) {

				snippets.push( `${ this.getVar( variable.type, variable.name ) };` );

			}

		}

		return snippets.join( '\n\t' );

	}

	getUniforms( shaderStage ) {

		const uniforms = this.uniforms[ shaderStage ];

		const bindingSnippets = [];
		const uniformGroups = {};

		for ( const uniform of uniforms ) {

			let snippet = null;
			let group = false;

			if ( uniform.type === 'texture' ) {

				const texture = uniform.node.value;

				let typePrefix = '';

				if ( texture.isDataTexture === true ) {


					if ( texture.type === UnsignedIntType ) {

						typePrefix = 'u';

					} else if ( texture.type === IntType ) {

						typePrefix = 'i';

					}

				}

				if ( texture.compareFunction ) {

					snippet = `sampler2DShadow ${ uniform.name };`;

				} else if ( texture.isDataArrayTexture === true ) {

					snippet = `${typePrefix}sampler2DArray ${ uniform.name };`;

				} else {

					snippet = `${typePrefix}sampler2D ${ uniform.name };`;

				}

			} else if ( uniform.type === 'cubeTexture' ) {

				snippet = `samplerCube ${ uniform.name };`;

			} else if ( uniform.type === 'texture3D' ) {

				snippet = `sampler3D ${ uniform.name };`;

			} else if ( uniform.type === 'buffer' ) {

				const bufferNode = uniform.node;
				const bufferType = this.getType( bufferNode.bufferType );
				const bufferCount = bufferNode.bufferCount;

				const bufferCountSnippet = bufferCount > 0 ? bufferCount : '';
				snippet = `${bufferNode.name} {\n\t${ bufferType } ${ uniform.name }[${ bufferCountSnippet }];\n};\n`;

			} else {

				const vectorType = this.getVectorType( uniform.type );

				snippet = `${ vectorType } ${ this.getPropertyName( uniform, shaderStage ) };`;

				group = true;

			}

			const precision = uniform.node.precision;

			if ( precision !== null ) {

				snippet = precisionLib[ precision ] + ' ' + snippet;

			}

			if ( group ) {

				snippet = '\t' + snippet;

				const groupName = uniform.groupNode.name;
				const groupSnippets = uniformGroups[ groupName ] || ( uniformGroups[ groupName ] = [] );

				groupSnippets.push( snippet );

			} else {

				snippet = 'uniform ' + snippet;

				bindingSnippets.push( snippet );

			}

		}

		let output = '';

		for ( const name in uniformGroups ) {

			const groupSnippets = uniformGroups[ name ];

			output += this._getGLSLUniformStruct( shaderStage + '_' + name, groupSnippets.join( '\n' ) ) + '\n';

		}

		output += bindingSnippets.join( '\n' );

		return output;

	}

	getTypeFromAttribute( attribute ) {

		let nodeType = super.getTypeFromAttribute( attribute );

		if ( /^[iu]/.test( nodeType ) && attribute.gpuType !== IntType ) {

			let dataAttribute = attribute;

			if ( attribute.isInterleavedBufferAttribute ) dataAttribute = attribute.data;

			const array = dataAttribute.array;

			if ( ( array instanceof Uint32Array || array instanceof Int32Array || array instanceof Uint16Array || array instanceof Int16Array ) === false ) {

				nodeType = nodeType.slice( 1 );

			}

		}

		return nodeType;

	}

	getAttributes( shaderStage ) {

		let snippet = '';

		if ( shaderStage === 'vertex' || shaderStage === 'compute' ) {

			const attributes = this.getAttributesArray();

			let location = 0;

			for ( const attribute of attributes ) {

				snippet += `layout( location = ${ location ++ } ) in ${ attribute.type } ${ attribute.name };\n`;

			}

		}

		return snippet;

	}

	getStructMembers( struct ) {

		const snippets = [];
		const members = struct.getMemberTypes();

		for ( let i = 0; i < members.length; i ++ ) {

			const member = members[ i ];
			snippets.push( `layout( location = ${i} ) out ${ member} m${i};` );

		}

		return snippets.join( '\n' );

	}

	getStructs( shaderStage ) {

		const snippets = [];
		const structs = this.structs[ shaderStage ];

		if ( structs.length === 0 ) {

			return 'layout( location = 0 ) out vec4 fragColor;\n';

		}

		for ( let index = 0, length = structs.length; index < length; index ++ ) {

			const struct = structs[ index ];

			let snippet = '\n';
			snippet += this.getStructMembers( struct );
			snippet += '\n';

			snippets.push( snippet );

		}

		return snippets.join( '\n\n' );

	}

	getVaryings( shaderStage ) {

		let snippet = '';

		const varyings = this.varyings;

		if ( shaderStage === 'vertex' || shaderStage === 'compute' ) {

			for ( const varying of varyings ) {

				if ( shaderStage === 'compute' ) varying.needsInterpolation = true;
				const type = varying.type;
				const flat = type.includes( 'int' ) || type.includes( 'uv' ) || type.includes( 'iv' ) ? 'flat ' : '';

				snippet += `${flat}${varying.needsInterpolation ? 'out' : '/*out*/'} ${type} ${varying.name};\n`;

			}

		} else if ( shaderStage === 'fragment' ) {

			for ( const varying of varyings ) {

				if ( varying.needsInterpolation ) {

					const type = varying.type;
					const flat = type.includes( 'int' ) || type.includes( 'uv' ) || type.includes( 'iv' ) ? 'flat ' : '';

					snippet += `${flat}in ${type} ${varying.name};\n`;

				}

			}

		}

		return snippet;

	}

	getVertexIndex() {

		return 'uint( gl_VertexID )';

	}

	getInstanceIndex() {

		return 'uint( gl_InstanceID )';

	}

	getDrawIndex() {

		const extensions = this.renderer.backend.extensions;

		if ( extensions.has( 'WEBGL_multi_draw' ) ) {

			return 'uint( gl_DrawID )';

		}

		return null;

	}

	getFrontFacing() {

		return 'gl_FrontFacing';

	}

	getFragCoord() {

		return 'gl_FragCoord';

	}

	getFragDepth() {

		return 'gl_FragDepth';

	}

	getExtensions( shaderStage ) {

		let extensions = '';

		if ( shaderStage === 'vertex' ) {

			const ext = this.renderer.backend.extensions;
			const isBatchedMesh = this.object.isBatchedMesh;

			if ( isBatchedMesh && ext.has( 'WEBGL_multi_draw' ) ) {

				extensions += '#extension GL_ANGLE_multi_draw : require\n';

			}

		}

		return extensions;

	}

	isAvailable( name ) {

		let result = supports$1[ name ];

		if ( result === undefined ) {

			if ( name === 'float32Filterable' ) {

				const extensions = this.renderer.backend.extensions;

				if ( extensions.has( 'OES_texture_float_linear' ) ) {

					extensions.get( 'OES_texture_float_linear' );
					result = true;

				} else {

					result = false;

				}

			}

			supports$1[ name ] = result;

		}

		return result;

	}

	isFlipY() {

		return true;

	}

	registerTransform( varyingName, attributeNode ) {

		this.transforms.push( { varyingName, attributeNode } );

	}

	getTransforms( /* shaderStage  */ ) {

		const transforms = this.transforms;

		let snippet = '';

		for ( let i = 0; i < transforms.length; i ++ ) {

			const transform = transforms[ i ];

			const attributeName = this.getPropertyName( transform.attributeNode );

			snippet += `${ transform.varyingName } = ${ attributeName };\n\t`;

		}

		return snippet;

	}

	_getGLSLUniformStruct( name, vars ) {

		return `
layout( std140 ) uniform ${name} {
${vars}
};`;

	}

	_getGLSLVertexCode( shaderData ) {

		return `#version 300 es

// extensions 
${shaderData.extensions}

// precision
${ defaultPrecisions }

// uniforms
${shaderData.uniforms}

// varyings
${shaderData.varyings}

// attributes
${shaderData.attributes}

// codes
${shaderData.codes}

void main() {

	// vars
	${shaderData.vars}

	// transforms
	${shaderData.transforms}

	// flow
	${shaderData.flow}

	gl_PointSize = 1.0;

}
`;

	}

	_getGLSLFragmentCode( shaderData ) {

		return `#version 300 es

${ this.getSignature() }

// precision
${ defaultPrecisions }

// uniforms
${shaderData.uniforms}

// varyings
${shaderData.varyings}

// codes
${shaderData.codes}

${shaderData.structs}

void main() {

	// vars
	${shaderData.vars}

	// flow
	${shaderData.flow}

}
`;

	}

	buildCode() {

		const shadersData = this.material !== null ? { fragment: {}, vertex: {} } : { compute: {} };

		for ( const shaderStage in shadersData ) {

			let flow = '// code\n\n';
			flow += this.flowCode[ shaderStage ];

			const flowNodes = this.flowNodes[ shaderStage ];
			const mainNode = flowNodes[ flowNodes.length - 1 ];

			for ( const node of flowNodes ) {

				const flowSlotData = this.getFlowData( node/*, shaderStage*/ );
				const slotName = node.name;

				if ( slotName ) {

					if ( flow.length > 0 ) flow += '\n';

					flow += `\t// flow -> ${ slotName }\n\t`;

				}

				flow += `${ flowSlotData.code }\n\t`;

				if ( node === mainNode && shaderStage !== 'compute' ) {

					flow += '// result\n\t';

					if ( shaderStage === 'vertex' ) {

						flow += 'gl_Position = ';
						flow += `${ flowSlotData.result };`;

					} else if ( shaderStage === 'fragment' ) {

						if ( ! node.outputNode.isOutputStructNode ) {

							flow += 'fragColor = ';
							flow += `${ flowSlotData.result };`;

						}

					}

				}

			}

			const stageData = shadersData[ shaderStage ];

			stageData.extensions = this.getExtensions( shaderStage );
			stageData.uniforms = this.getUniforms( shaderStage );
			stageData.attributes = this.getAttributes( shaderStage );
			stageData.varyings = this.getVaryings( shaderStage );
			stageData.vars = this.getVars( shaderStage );
			stageData.structs = this.getStructs( shaderStage );
			stageData.codes = this.getCodes( shaderStage );
			stageData.transforms = this.getTransforms( shaderStage );
			stageData.flow = flow;

		}

		if ( this.material !== null ) {

			this.vertexShader = this._getGLSLVertexCode( shadersData.vertex );
			this.fragmentShader = this._getGLSLFragmentCode( shadersData.fragment );

		} else {

			this.computeShader = this._getGLSLVertexCode( shadersData.compute );

		}

	}

	getUniformFromNode( node, type, shaderStage, name = null ) {

		const uniformNode = super.getUniformFromNode( node, type, shaderStage, name );
		const nodeData = this.getDataFromNode( node, shaderStage, this.globalCache );

		let uniformGPU = nodeData.uniformGPU;

		if ( uniformGPU === undefined ) {

			const group = node.groupNode;
			const groupName = group.name;

			const bindings = this.getBindGroupArray( groupName, shaderStage );

			if ( type === 'texture' ) {

				uniformGPU = new NodeSampledTexture( uniformNode.name, uniformNode.node, group );
				bindings.push( uniformGPU );

			} else if ( type === 'cubeTexture' ) {

				uniformGPU = new NodeSampledCubeTexture( uniformNode.name, uniformNode.node, group );
				bindings.push( uniformGPU );

			} else if ( type === 'texture3D' ) {

				uniformGPU = new NodeSampledTexture3D( uniformNode.name, uniformNode.node, group );
				bindings.push( uniformGPU );

			} else if ( type === 'buffer' ) {

				node.name = `NodeBuffer_${ node.id }`;
				uniformNode.name = `buffer${ node.id }`;

				const buffer = new NodeUniformBuffer( node, group );
				buffer.name = node.name;

				bindings.push( buffer );

				uniformGPU = buffer;

			} else {

				const uniformsStage = this.uniformGroups[ shaderStage ] || ( this.uniformGroups[ shaderStage ] = {} );

				let uniformsGroup = uniformsStage[ groupName ];

				if ( uniformsGroup === undefined ) {

					uniformsGroup = new NodeUniformsGroup( shaderStage + '_' + groupName, group );
					//uniformsGroup.setVisibility( gpuShaderStageLib[ shaderStage ] );

					uniformsStage[ groupName ] = uniformsGroup;

					bindings.push( uniformsGroup );

				}

				uniformGPU = this.getNodeUniform( uniformNode, type );

				uniformsGroup.addUniform( uniformGPU );

			}

			nodeData.uniformGPU = uniformGPU;

		}

		return uniformNode;

	}

}

let vector2 = null;
let vector4 = null;
let color4 = null;

class Backend {

	constructor( parameters = {} ) {

		this.parameters = Object.assign( {}, parameters );
		this.data = new WeakMap();
		this.renderer = null;
		this.domElement = null;

	}

	async init( renderer ) {

		this.renderer = renderer;

	}

	// render context

	begin( /*renderContext*/ ) { }

	finish( /*renderContext*/ ) { }

	// render object

	draw( /*renderObject, info*/ ) { }

	// program

	createProgram( /*program*/ ) { }

	destroyProgram( /*program*/ ) { }

	// bindings

	createBindings( /*renderObject*/ ) { }

	updateBindings( /*renderObject*/ ) { }

	// pipeline

	createRenderPipeline( /*renderObject*/ ) { }

	createComputePipeline( /*computeNode, pipeline*/ ) { }

	destroyPipeline( /*pipeline*/ ) { }

	// cache key

	needsRenderUpdate( /*renderObject*/ ) { } // return Boolean ( fast test )

	getRenderCacheKey( /*renderObject*/ ) { } // return String

	// node builder

	createNodeBuilder( /*renderObject*/ ) { } // return NodeBuilder (ADD IT)

	// textures

	createSampler( /*texture*/ ) { }

	createDefaultTexture( /*texture*/ ) { }

	createTexture( /*texture*/ ) { }

	copyTextureToBuffer( /*texture, x, y, width, height*/ ) {}

	// attributes

	createAttribute( /*attribute*/ ) { }

	createIndexAttribute( /*attribute*/ ) { }

	updateAttribute( /*attribute*/ ) { }

	destroyAttribute( /*attribute*/ ) { }

	// canvas

	getContext() { }

	updateSize() { }

	// utils

	resolveTimestampAsync( /*renderContext, type*/ ) { }

	hasFeatureAsync( /*name*/ ) { } // return Boolean

	hasFeature( /*name*/ ) { } // return Boolean

	getInstanceCount( renderObject ) {

		const { object, geometry } = renderObject;

		return geometry.isInstancedBufferGeometry ? geometry.instanceCount : ( object.count > 1 ? object.count : 1 );

	}

	getDrawingBufferSize() {

		vector2 = vector2 || new Vector2();

		return this.renderer.getDrawingBufferSize( vector2 );

	}

	getScissor() {

		vector4 = vector4 || new Vector4();

		return this.renderer.getScissor( vector4 );

	}

	setScissorTest( /*boolean*/ ) { }

	getClearColor() {

		const renderer = this.renderer;

		color4 = color4 || new Color4();

		renderer.getClearColor( color4 );

		color4.getRGB( color4, this.renderer.currentColorSpace );

		return color4;

	}

	getDomElement() {

		let domElement = this.domElement;

		if ( domElement === null ) {

			domElement = ( this.parameters.canvas !== undefined ) ? this.parameters.canvas : createCanvasElement();

			// OffscreenCanvas does not have setAttribute, see #22811
			if ( 'setAttribute' in domElement ) domElement.setAttribute( 'data-engine', `three.js r${REVISION} webgpu` );

			this.domElement = domElement;

		}

		return domElement;

	}

	// resource properties

	set( object, value ) {

		this.data.set( object, value );

	}

	get( object ) {

		let map = this.data.get( object );

		if ( map === undefined ) {

			map = {};
			this.data.set( object, map );

		}

		return map;

	}

	has( object ) {

		return this.data.has( object );

	}

	delete( object ) {

		this.data.delete( object );

	}

}

let _id$1 = 0;

class DualAttributeData {

	constructor( attributeData, dualBuffer ) {

		this.buffers = [ attributeData.bufferGPU, dualBuffer ];
		this.type = attributeData.type;
		this.bufferType = attributeData.bufferType;
		this.pbo = attributeData.pbo;
		this.byteLength = attributeData.byteLength;
		this.bytesPerElement = attributeData.BYTES_PER_ELEMENT;
		this.version = attributeData.version;
		this.isInteger = attributeData.isInteger;
		this.activeBufferIndex = 0;
		this.baseId = attributeData.id;

	}


	get id() {

		return `${ this.baseId }|${ this.activeBufferIndex }`;

	}

	get bufferGPU() {

		return this.buffers[ this.activeBufferIndex ];

	}

	get transformBuffer() {

		return this.buffers[ this.activeBufferIndex ^ 1 ];

	}

	switchBuffers() {

		this.activeBufferIndex ^= 1;

	}

}

class WebGLAttributeUtils {

	constructor( backend ) {

		this.backend = backend;

	}

	createAttribute( attribute, bufferType ) {

		const backend = this.backend;
		const { gl } = backend;

		const array = attribute.array;
		const usage = attribute.usage || gl.STATIC_DRAW;

		const bufferAttribute = attribute.isInterleavedBufferAttribute ? attribute.data : attribute;
		const bufferData = backend.get( bufferAttribute );

		let bufferGPU = bufferData.bufferGPU;

		if ( bufferGPU === undefined ) {

			bufferGPU = this._createBuffer( gl, bufferType, array, usage );

			bufferData.bufferGPU = bufferGPU;
			bufferData.bufferType = bufferType;
			bufferData.version = bufferAttribute.version;

		}

		//attribute.onUploadCallback();

		let type;

		if ( array instanceof Float32Array ) {

			type = gl.FLOAT;

		} else if ( array instanceof Uint16Array ) {

			if ( attribute.isFloat16BufferAttribute ) {

				type = gl.HALF_FLOAT;

			} else {

				type = gl.UNSIGNED_SHORT;

			}

		} else if ( array instanceof Int16Array ) {

			type = gl.SHORT;

		} else if ( array instanceof Uint32Array ) {

			type = gl.UNSIGNED_INT;

		} else if ( array instanceof Int32Array ) {

			type = gl.INT;

		} else if ( array instanceof Int8Array ) {

			type = gl.BYTE;

		} else if ( array instanceof Uint8Array ) {

			type = gl.UNSIGNED_BYTE;

		} else if ( array instanceof Uint8ClampedArray ) {

			type = gl.UNSIGNED_BYTE;

		} else {

			throw new Error( 'THREE.WebGLBackend: Unsupported buffer data format: ' + array );

		}

		let attributeData = {
			bufferGPU,
			bufferType,
			type,
			byteLength: array.byteLength,
			bytesPerElement: array.BYTES_PER_ELEMENT,
			version: attribute.version,
			pbo: attribute.pbo,
			isInteger: type === gl.INT || type === gl.UNSIGNED_INT || type === gl.UNSIGNED_SHORT || attribute.gpuType === IntType,
			id: _id$1 ++
		};

		if ( attribute.isStorageBufferAttribute || attribute.isStorageInstancedBufferAttribute ) {

			// create buffer for tranform feedback use
			const bufferGPUDual = this._createBuffer( gl, bufferType, array, usage );
			attributeData = new DualAttributeData( attributeData, bufferGPUDual );

		}

		backend.set( attribute, attributeData );

	}

	updateAttribute( attribute ) {

		const backend = this.backend;
		const { gl } = backend;

		const array = attribute.array;
		const bufferAttribute = attribute.isInterleavedBufferAttribute ? attribute.data : attribute;
		const bufferData = backend.get( bufferAttribute );
		const bufferType = bufferData.bufferType;
		const updateRanges = attribute.isInterleavedBufferAttribute ? attribute.data.updateRanges : attribute.updateRanges;

		gl.bindBuffer( bufferType, bufferData.bufferGPU );

		if ( updateRanges.length === 0 ) {

			// Not using update ranges

			gl.bufferSubData( bufferType, 0, array );

		} else {

			for ( let i = 0, l = updateRanges.length; i < l; i ++ ) {

				const range = updateRanges[ i ];
				gl.bufferSubData( bufferType, range.start * array.BYTES_PER_ELEMENT,
					array, range.start, range.count );

			}

			bufferAttribute.clearUpdateRanges();

		}

		gl.bindBuffer( bufferType, null );

		bufferData.version = bufferAttribute.version;

	}

	destroyAttribute( attribute ) {

		const backend = this.backend;
		const { gl } = backend;

		if ( attribute.isInterleavedBufferAttribute ) {

			backend.delete( attribute.data );

		}

		const attributeData = backend.get( attribute );

		gl.deleteBuffer( attributeData.bufferGPU );

		backend.delete( attribute );

	}

	async getArrayBufferAsync( attribute ) {

		const backend = this.backend;
		const { gl } = backend;

		const bufferAttribute = attribute.isInterleavedBufferAttribute ? attribute.data : attribute;
		const { bufferGPU } = backend.get( bufferAttribute );

		const array = attribute.array;
		const byteLength = array.byteLength;

		gl.bindBuffer( gl.COPY_READ_BUFFER, bufferGPU );

		const writeBuffer = gl.createBuffer();

		gl.bindBuffer( gl.COPY_WRITE_BUFFER, writeBuffer );
		gl.bufferData( gl.COPY_WRITE_BUFFER, byteLength, gl.STREAM_READ );

		gl.copyBufferSubData( gl.COPY_READ_BUFFER, gl.COPY_WRITE_BUFFER, 0, 0, byteLength );

		await backend.utils._clientWaitAsync();

		const dstBuffer = new attribute.array.constructor( array.length );

		gl.getBufferSubData( gl.COPY_WRITE_BUFFER, 0, dstBuffer );

		gl.deleteBuffer( writeBuffer );

		return dstBuffer.buffer;

	}

	_createBuffer( gl, bufferType, array, usage ) {

		const bufferGPU = gl.createBuffer();

		gl.bindBuffer( bufferType, bufferGPU );
		gl.bufferData( bufferType, array, usage );
		gl.bindBuffer( bufferType, null );

		return bufferGPU;

	}

}

let initialized$1 = false, equationToGL, factorToGL;

class WebGLState {

	constructor( backend ) {

		this.backend = backend;

		this.gl = this.backend.gl;

		this.enabled = {};
		this.currentFlipSided = null;
		this.currentCullFace = null;
		this.currentProgram = null;
		this.currentBlendingEnabled = false;
		this.currentBlending = null;
		this.currentBlendSrc = null;
		this.currentBlendDst = null;
		this.currentBlendSrcAlpha = null;
		this.currentBlendDstAlpha = null;
		this.currentPremultipledAlpha = null;
		this.currentPolygonOffsetFactor = null;
		this.currentPolygonOffsetUnits = null;
		this.currentColorMask = null;
		this.currentDepthFunc = null;
		this.currentDepthMask = null;
		this.currentStencilFunc = null;
		this.currentStencilRef = null;
		this.currentStencilFuncMask = null;
		this.currentStencilFail = null;
		this.currentStencilZFail = null;
		this.currentStencilZPass = null;
		this.currentStencilMask = null;
		this.currentLineWidth = null;

		this.currentBoundFramebuffers = {};
		this.currentDrawbuffers = new WeakMap();

		this.maxTextures = this.gl.getParameter( this.gl.MAX_TEXTURE_IMAGE_UNITS );
		this.currentTextureSlot = null;
		this.currentBoundTextures = {};

		if ( initialized$1 === false ) {

			this._init( this.gl );

			initialized$1 = true;

		}

	}

	_init( gl ) {

		// Store only WebGL constants here.

		equationToGL = {
			[ AddEquation ]: gl.FUNC_ADD,
			[ SubtractEquation ]: gl.FUNC_SUBTRACT,
			[ ReverseSubtractEquation ]: gl.FUNC_REVERSE_SUBTRACT
		};

		factorToGL = {
			[ ZeroFactor ]: gl.ZERO,
			[ OneFactor ]: gl.ONE,
			[ SrcColorFactor ]: gl.SRC_COLOR,
			[ SrcAlphaFactor ]: gl.SRC_ALPHA,
			[ SrcAlphaSaturateFactor ]: gl.SRC_ALPHA_SATURATE,
			[ DstColorFactor ]: gl.DST_COLOR,
			[ DstAlphaFactor ]: gl.DST_ALPHA,
			[ OneMinusSrcColorFactor ]: gl.ONE_MINUS_SRC_COLOR,
			[ OneMinusSrcAlphaFactor ]: gl.ONE_MINUS_SRC_ALPHA,
			[ OneMinusDstColorFactor ]: gl.ONE_MINUS_DST_COLOR,
			[ OneMinusDstAlphaFactor ]: gl.ONE_MINUS_DST_ALPHA
		};

	}

	enable( id ) {

		const { enabled } = this;

		if ( enabled[ id ] !== true ) {

			this.gl.enable( id );
			enabled[ id ] = true;

		}

	}

	disable( id ) {

		const { enabled } = this;

		if ( enabled[ id ] !== false ) {

			this.gl.disable( id );
			enabled[ id ] = false;

		}

	}

	setFlipSided( flipSided ) {

		if ( this.currentFlipSided !== flipSided ) {

			const { gl } = this;

			if ( flipSided ) {

				gl.frontFace( gl.CW );

			} else {

				gl.frontFace( gl.CCW );

			}

			this.currentFlipSided = flipSided;

		}

	}

	setCullFace( cullFace ) {

		const { gl } = this;

		if ( cullFace !== CullFaceNone ) {

			this.enable( gl.CULL_FACE );

			if ( cullFace !== this.currentCullFace ) {

				if ( cullFace === CullFaceBack ) {

					gl.cullFace( gl.BACK );

				} else if ( cullFace === CullFaceFront ) {

					gl.cullFace( gl.FRONT );

				} else {

					gl.cullFace( gl.FRONT_AND_BACK );

				}

			}

		} else {

			this.disable( gl.CULL_FACE );

		}

		this.currentCullFace = cullFace;

	}

	setLineWidth( width ) {

		const { currentLineWidth, gl } = this;

		if ( width !== currentLineWidth ) {

			gl.lineWidth( width );

			this.currentLineWidth = width;

		}

	}


	setBlending( blending, blendEquation, blendSrc, blendDst, blendEquationAlpha, blendSrcAlpha, blendDstAlpha, premultipliedAlpha ) {

		const { gl } = this;

		if ( blending === NoBlending ) {

			if ( this.currentBlendingEnabled === true ) {

				this.disable( gl.BLEND );
				this.currentBlendingEnabled = false;

			}

			return;

		}

		if ( this.currentBlendingEnabled === false ) {

			this.enable( gl.BLEND );
			this.currentBlendingEnabled = true;

		}

		if ( blending !== CustomBlending ) {

			if ( blending !== this.currentBlending || premultipliedAlpha !== this.currentPremultipledAlpha ) {

				if ( this.currentBlendEquation !== AddEquation || this.currentBlendEquationAlpha !== AddEquation ) {

					gl.blendEquation( gl.FUNC_ADD );

					this.currentBlendEquation = AddEquation;
					this.currentBlendEquationAlpha = AddEquation;

				}

				if ( premultipliedAlpha ) {

					switch ( blending ) {

						case NormalBlending:
							gl.blendFuncSeparate( gl.ONE, gl.ONE_MINUS_SRC_ALPHA, gl.ONE, gl.ONE_MINUS_SRC_ALPHA );
							break;

						case AdditiveBlending:
							gl.blendFunc( gl.ONE, gl.ONE );
							break;

						case SubtractiveBlending:
							gl.blendFuncSeparate( gl.ZERO, gl.ONE_MINUS_SRC_COLOR, gl.ZERO, gl.ONE );
							break;

						case MultiplyBlending:
							gl.blendFuncSeparate( gl.ZERO, gl.SRC_COLOR, gl.ZERO, gl.SRC_ALPHA );
							break;

						default:
							console.error( 'THREE.WebGLState: Invalid blending: ', blending );
							break;

					}

				} else {

					switch ( blending ) {

						case NormalBlending:
							gl.blendFuncSeparate( gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA, gl.ONE, gl.ONE_MINUS_SRC_ALPHA );
							break;

						case AdditiveBlending:
							gl.blendFunc( gl.SRC_ALPHA, gl.ONE );
							break;

						case SubtractiveBlending:
							gl.blendFuncSeparate( gl.ZERO, gl.ONE_MINUS_SRC_COLOR, gl.ZERO, gl.ONE );
							break;

						case MultiplyBlending:
							gl.blendFunc( gl.ZERO, gl.SRC_COLOR );
							break;

						default:
							console.error( 'THREE.WebGLState: Invalid blending: ', blending );
							break;

					}

				}

				this.currentBlendSrc = null;
				this.currentBlendDst = null;
				this.currentBlendSrcAlpha = null;
				this.currentBlendDstAlpha = null;

				this.currentBlending = blending;
				this.currentPremultipledAlpha = premultipliedAlpha;

			}

			return;

		}

		// custom blending

		blendEquationAlpha = blendEquationAlpha || blendEquation;
		blendSrcAlpha = blendSrcAlpha || blendSrc;
		blendDstAlpha = blendDstAlpha || blendDst;

		if ( blendEquation !== this.currentBlendEquation || blendEquationAlpha !== this.currentBlendEquationAlpha ) {

			gl.blendEquationSeparate( equationToGL[ blendEquation ], equationToGL[ blendEquationAlpha ] );

			this.currentBlendEquation = blendEquation;
			this.currentBlendEquationAlpha = blendEquationAlpha;

		}

		if ( blendSrc !== this.currentBlendSrc || blendDst !== this.currentBlendDst || blendSrcAlpha !== this.currentBlendSrcAlpha || blendDstAlpha !== this.currentBlendDstAlpha ) {

			gl.blendFuncSeparate( factorToGL[ blendSrc ], factorToGL[ blendDst ], factorToGL[ blendSrcAlpha ], factorToGL[ blendDstAlpha ] );

			this.currentBlendSrc = blendSrc;
			this.currentBlendDst = blendDst;
			this.currentBlendSrcAlpha = blendSrcAlpha;
			this.currentBlendDstAlpha = blendDstAlpha;

		}

		this.currentBlending = blending;
		this.currentPremultipledAlpha = false;

	}

	setColorMask( colorMask ) {

		if ( this.currentColorMask !== colorMask ) {

			this.gl.colorMask( colorMask, colorMask, colorMask, colorMask );
			this.currentColorMask = colorMask;

		}

	}

	setDepthTest( depthTest ) {

		const { gl } = this;

		if ( depthTest ) {

			this.enable( gl.DEPTH_TEST );

		} else {

			this.disable( gl.DEPTH_TEST );

		}

	}

	setDepthMask( depthMask ) {

		if ( this.currentDepthMask !== depthMask ) {

			this.gl.depthMask( depthMask );
			this.currentDepthMask = depthMask;

		}

	}

	setDepthFunc( depthFunc ) {

		if ( this.currentDepthFunc !== depthFunc ) {

			const { gl } = this;

			switch ( depthFunc ) {

				case NeverDepth:

					gl.depthFunc( gl.NEVER );
					break;

				case AlwaysDepth:

					gl.depthFunc( gl.ALWAYS );
					break;

				case LessDepth:

					gl.depthFunc( gl.LESS );
					break;

				case LessEqualDepth:

					gl.depthFunc( gl.LEQUAL );
					break;

				case EqualDepth:

					gl.depthFunc( gl.EQUAL );
					break;

				case GreaterEqualDepth:

					gl.depthFunc( gl.GEQUAL );
					break;

				case GreaterDepth:

					gl.depthFunc( gl.GREATER );
					break;

				case NotEqualDepth:

					gl.depthFunc( gl.NOTEQUAL );
					break;

				default:

					gl.depthFunc( gl.LEQUAL );

			}

			this.currentDepthFunc = depthFunc;

		}

	}

	setStencilTest( stencilTest ) {

		const { gl } = this;

		if ( stencilTest ) {

			this.enable( gl.STENCIL_TEST );

		} else {

			this.disable( gl.STENCIL_TEST );

		}

	}

	setStencilMask( stencilMask ) {

		if ( this.currentStencilMask !== stencilMask ) {

			this.gl.stencilMask( stencilMask );
			this.currentStencilMask = stencilMask;

		}

	}

	setStencilFunc( stencilFunc, stencilRef, stencilMask ) {

		if ( this.currentStencilFunc !== stencilFunc ||
			 this.currentStencilRef !== stencilRef ||
			 this.currentStencilFuncMask !== stencilMask ) {

			this.gl.stencilFunc( stencilFunc, stencilRef, stencilMask );

			this.currentStencilFunc = stencilFunc;
			this.currentStencilRef = stencilRef;
			this.currentStencilFuncMask = stencilMask;

		}

	}

	setStencilOp( stencilFail, stencilZFail, stencilZPass ) {

		if ( this.currentStencilFail !== stencilFail ||
			 this.currentStencilZFail !== stencilZFail ||
			 this.currentStencilZPass !== stencilZPass ) {

			this.gl.stencilOp( stencilFail, stencilZFail, stencilZPass );

			this.currentStencilFail = stencilFail;
			this.currentStencilZFail = stencilZFail;
			this.currentStencilZPass = stencilZPass;

		}

	}

	setMaterial( material, frontFaceCW ) {

		const { gl } = this;

		material.side === DoubleSide
			? this.disable( gl.CULL_FACE )
			: this.enable( gl.CULL_FACE );

		let flipSided = ( material.side === BackSide );
		if ( frontFaceCW ) flipSided = ! flipSided;

		this.setFlipSided( flipSided );

		( material.blending === NormalBlending && material.transparent === false )
			? this.setBlending( NoBlending )
			: this.setBlending( material.blending, material.blendEquation, material.blendSrc, material.blendDst, material.blendEquationAlpha, material.blendSrcAlpha, material.blendDstAlpha, material.premultipliedAlpha );

		this.setDepthFunc( material.depthFunc );
		this.setDepthTest( material.depthTest );
		this.setDepthMask( material.depthWrite );
		this.setColorMask( material.colorWrite );

		const stencilWrite = material.stencilWrite;
		this.setStencilTest( stencilWrite );
		if ( stencilWrite ) {

			this.setStencilMask( material.stencilWriteMask );
			this.setStencilFunc( material.stencilFunc, material.stencilRef, material.stencilFuncMask );
			this.setStencilOp( material.stencilFail, material.stencilZFail, material.stencilZPass );

		}

		this.setPolygonOffset( material.polygonOffset, material.polygonOffsetFactor, material.polygonOffsetUnits );

		material.alphaToCoverage === true
			? this.enable( gl.SAMPLE_ALPHA_TO_COVERAGE )
			: this.disable( gl.SAMPLE_ALPHA_TO_COVERAGE );

	}

	setPolygonOffset( polygonOffset, factor, units ) {

		const { gl } = this;

		if ( polygonOffset ) {

			this.enable( gl.POLYGON_OFFSET_FILL );

			if ( this.currentPolygonOffsetFactor !== factor || this.currentPolygonOffsetUnits !== units ) {

				gl.polygonOffset( factor, units );

				this.currentPolygonOffsetFactor = factor;
				this.currentPolygonOffsetUnits = units;

			}

		} else {

			this.disable( gl.POLYGON_OFFSET_FILL );

		}

	}

	useProgram( program ) {

		if ( this.currentProgram !== program ) {

			this.gl.useProgram( program );

			this.currentProgram = program;

			return true;

		}

		return false;

	}

	// framebuffer


	bindFramebuffer( target, framebuffer ) {

		const { gl, currentBoundFramebuffers } = this;

		if ( currentBoundFramebuffers[ target ] !== framebuffer ) {

			gl.bindFramebuffer( target, framebuffer );

			currentBoundFramebuffers[ target ] = framebuffer;

			// gl.DRAW_FRAMEBUFFER is equivalent to gl.FRAMEBUFFER

			if ( target === gl.DRAW_FRAMEBUFFER ) {

				currentBoundFramebuffers[ gl.FRAMEBUFFER ] = framebuffer;

			}

			if ( target === gl.FRAMEBUFFER ) {

				currentBoundFramebuffers[ gl.DRAW_FRAMEBUFFER ] = framebuffer;

			}

			return true;

		}

		return false;

	}

	drawBuffers( renderContext, framebuffer ) {

		const { gl } = this;

		let drawBuffers = [];

		let needsUpdate = false;

		if ( renderContext.textures !== null ) {

			drawBuffers = this.currentDrawbuffers.get( framebuffer );

			if ( drawBuffers === undefined ) {

				drawBuffers = [];
				this.currentDrawbuffers.set( framebuffer, drawBuffers );

			}


			const textures = renderContext.textures;

			if ( drawBuffers.length !== textures.length || drawBuffers[ 0 ] !== gl.COLOR_ATTACHMENT0 ) {

				for ( let i = 0, il = textures.length; i < il; i ++ ) {

					drawBuffers[ i ] = gl.COLOR_ATTACHMENT0 + i;

				}

				drawBuffers.length = textures.length;

				needsUpdate = true;

			}


		} else {

			if ( drawBuffers[ 0 ] !== gl.BACK ) {

				drawBuffers[ 0 ] = gl.BACK;

				needsUpdate = true;

			}

		}

		if ( needsUpdate ) {

			gl.drawBuffers( drawBuffers );

		}


	}


	// texture

	activeTexture( webglSlot ) {

		const { gl, currentTextureSlot, maxTextures } = this;

		if ( webglSlot === undefined ) webglSlot = gl.TEXTURE0 + maxTextures - 1;

		if ( currentTextureSlot !== webglSlot ) {

			gl.activeTexture( webglSlot );
			this.currentTextureSlot = webglSlot;

		}

	}

	bindTexture( webglType, webglTexture, webglSlot ) {

		const { gl, currentTextureSlot, currentBoundTextures, maxTextures } = this;

		if ( webglSlot === undefined ) {

			if ( currentTextureSlot === null ) {

				webglSlot = gl.TEXTURE0 + maxTextures - 1;

			} else {

				webglSlot = currentTextureSlot;

			}

		}

		let boundTexture = currentBoundTextures[ webglSlot ];

		if ( boundTexture === undefined ) {

			boundTexture = { type: undefined, texture: undefined };
			currentBoundTextures[ webglSlot ] = boundTexture;

		}

		if ( boundTexture.type !== webglType || boundTexture.texture !== webglTexture ) {

			if ( currentTextureSlot !== webglSlot ) {

				gl.activeTexture( webglSlot );
				this.currentTextureSlot = webglSlot;

			}

			gl.bindTexture( webglType, webglTexture );

			boundTexture.type = webglType;
			boundTexture.texture = webglTexture;


		}


	}

	unbindTexture() {

		const { gl, currentTextureSlot, currentBoundTextures } = this;

		const boundTexture = currentBoundTextures[ currentTextureSlot ];

		if ( boundTexture !== undefined && boundTexture.type !== undefined ) {

			gl.bindTexture( boundTexture.type, null );

			boundTexture.type = undefined;
			boundTexture.texture = undefined;

		}

	}

}

class WebGLUtils {

	constructor( backend ) {

		this.backend = backend;

		this.gl = this.backend.gl;
		this.extensions = backend.extensions;

	}

	convert( p, colorSpace = NoColorSpace ) {

		const { gl, extensions } = this;

		let extension;

		if ( p === UnsignedByteType ) return gl.UNSIGNED_BYTE;
		if ( p === UnsignedShort4444Type ) return gl.UNSIGNED_SHORT_4_4_4_4;
		if ( p === UnsignedShort5551Type ) return gl.UNSIGNED_SHORT_5_5_5_1;
		if ( p === UnsignedInt5999Type ) return gl.UNSIGNED_INT_5_9_9_9_REV;

		if ( p === ByteType ) return gl.BYTE;
		if ( p === ShortType ) return gl.SHORT;
		if ( p === UnsignedShortType ) return gl.UNSIGNED_SHORT;
		if ( p === IntType ) return gl.INT;
		if ( p === UnsignedIntType ) return gl.UNSIGNED_INT;
		if ( p === FloatType ) return gl.FLOAT;

		if ( p === HalfFloatType ) {

			return gl.HALF_FLOAT;

		}

		if ( p === AlphaFormat ) return gl.ALPHA;
		if ( p === RGBFormat ) return gl.RGB;
		if ( p === RGBAFormat ) return gl.RGBA;
		if ( p === LuminanceFormat ) return gl.LUMINANCE;
		if ( p === LuminanceAlphaFormat ) return gl.LUMINANCE_ALPHA;
		if ( p === DepthFormat ) return gl.DEPTH_COMPONENT;
		if ( p === DepthStencilFormat ) return gl.DEPTH_STENCIL;

		// WebGL2 formats.

		if ( p === RedFormat ) return gl.RED;
		if ( p === RedIntegerFormat ) return gl.RED_INTEGER;
		if ( p === RGFormat ) return gl.RG;
		if ( p === RGIntegerFormat ) return gl.RG_INTEGER;
		if ( p === RGBAIntegerFormat ) return gl.RGBA_INTEGER;

		// S3TC

		if ( p === RGB_S3TC_DXT1_Format || p === RGBA_S3TC_DXT1_Format || p === RGBA_S3TC_DXT3_Format || p === RGBA_S3TC_DXT5_Format ) {

			if ( colorSpace === SRGBColorSpace ) {

				extension = extensions.get( 'WEBGL_compressed_texture_s3tc_srgb' );

				if ( extension !== null ) {

					if ( p === RGB_S3TC_DXT1_Format ) return extension.COMPRESSED_SRGB_S3TC_DXT1_EXT;
					if ( p === RGBA_S3TC_DXT1_Format ) return extension.COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT;
					if ( p === RGBA_S3TC_DXT3_Format ) return extension.COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT;
					if ( p === RGBA_S3TC_DXT5_Format ) return extension.COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT;

				} else {

					return null;

				}

			} else {

				extension = extensions.get( 'WEBGL_compressed_texture_s3tc' );

				if ( extension !== null ) {

					if ( p === RGB_S3TC_DXT1_Format ) return extension.COMPRESSED_RGB_S3TC_DXT1_EXT;
					if ( p === RGBA_S3TC_DXT1_Format ) return extension.COMPRESSED_RGBA_S3TC_DXT1_EXT;
					if ( p === RGBA_S3TC_DXT3_Format ) return extension.COMPRESSED_RGBA_S3TC_DXT3_EXT;
					if ( p === RGBA_S3TC_DXT5_Format ) return extension.COMPRESSED_RGBA_S3TC_DXT5_EXT;

				} else {

					return null;

				}

			}

		}

		// PVRTC

		if ( p === RGB_PVRTC_4BPPV1_Format || p === RGB_PVRTC_2BPPV1_Format || p === RGBA_PVRTC_4BPPV1_Format || p === RGBA_PVRTC_2BPPV1_Format ) {

			extension = extensions.get( 'WEBGL_compressed_texture_pvrtc' );

			if ( extension !== null ) {

				if ( p === RGB_PVRTC_4BPPV1_Format ) return extension.COMPRESSED_RGB_PVRTC_4BPPV1_IMG;
				if ( p === RGB_PVRTC_2BPPV1_Format ) return extension.COMPRESSED_RGB_PVRTC_2BPPV1_IMG;
				if ( p === RGBA_PVRTC_4BPPV1_Format ) return extension.COMPRESSED_RGBA_PVRTC_4BPPV1_IMG;
				if ( p === RGBA_PVRTC_2BPPV1_Format ) return extension.COMPRESSED_RGBA_PVRTC_2BPPV1_IMG;

			} else {

				return null;

			}

		}

		// ETC

		if ( p === RGB_ETC1_Format || p === RGB_ETC2_Format || p === RGBA_ETC2_EAC_Format ) {

			extension = extensions.get( 'WEBGL_compressed_texture_etc' );

			if ( extension !== null ) {

				if ( p === RGB_ETC1_Format || p === RGB_ETC2_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB8_ETC2 : extension.COMPRESSED_RGB8_ETC2;
				if ( p === RGBA_ETC2_EAC_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB8_ALPHA8_ETC2_EAC : extension.COMPRESSED_RGBA8_ETC2_EAC;

			} else {

				return null;

			}

		}

		// ASTC

		if ( p === RGBA_ASTC_4x4_Format || p === RGBA_ASTC_5x4_Format || p === RGBA_ASTC_5x5_Format ||
			p === RGBA_ASTC_6x5_Format || p === RGBA_ASTC_6x6_Format || p === RGBA_ASTC_8x5_Format ||
			p === RGBA_ASTC_8x6_Format || p === RGBA_ASTC_8x8_Format || p === RGBA_ASTC_10x5_Format ||
			p === RGBA_ASTC_10x6_Format || p === RGBA_ASTC_10x8_Format || p === RGBA_ASTC_10x10_Format ||
			p === RGBA_ASTC_12x10_Format || p === RGBA_ASTC_12x12_Format ) {

			extension = extensions.get( 'WEBGL_compressed_texture_astc' );

			if ( extension !== null ) {

				if ( p === RGBA_ASTC_4x4_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR : extension.COMPRESSED_RGBA_ASTC_4x4_KHR;
				if ( p === RGBA_ASTC_5x4_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_5x4_KHR : extension.COMPRESSED_RGBA_ASTC_5x4_KHR;
				if ( p === RGBA_ASTC_5x5_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_5x5_KHR : extension.COMPRESSED_RGBA_ASTC_5x5_KHR;
				if ( p === RGBA_ASTC_6x5_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_6x5_KHR : extension.COMPRESSED_RGBA_ASTC_6x5_KHR;
				if ( p === RGBA_ASTC_6x6_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_6x6_KHR : extension.COMPRESSED_RGBA_ASTC_6x6_KHR;
				if ( p === RGBA_ASTC_8x5_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_8x5_KHR : extension.COMPRESSED_RGBA_ASTC_8x5_KHR;
				if ( p === RGBA_ASTC_8x6_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_8x6_KHR : extension.COMPRESSED_RGBA_ASTC_8x6_KHR;
				if ( p === RGBA_ASTC_8x8_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHR : extension.COMPRESSED_RGBA_ASTC_8x8_KHR;
				if ( p === RGBA_ASTC_10x5_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_10x5_KHR : extension.COMPRESSED_RGBA_ASTC_10x5_KHR;
				if ( p === RGBA_ASTC_10x6_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHR : extension.COMPRESSED_RGBA_ASTC_10x6_KHR;
				if ( p === RGBA_ASTC_10x8_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_10x8_KHR : extension.COMPRESSED_RGBA_ASTC_10x8_KHR;
				if ( p === RGBA_ASTC_10x10_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_10x10_KHR : extension.COMPRESSED_RGBA_ASTC_10x10_KHR;
				if ( p === RGBA_ASTC_12x10_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_12x10_KHR : extension.COMPRESSED_RGBA_ASTC_12x10_KHR;
				if ( p === RGBA_ASTC_12x12_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_12x12_KHR : extension.COMPRESSED_RGBA_ASTC_12x12_KHR;

			} else {

				return null;

			}

		}

		// BPTC

		if ( p === RGBA_BPTC_Format ) {

			extension = extensions.get( 'EXT_texture_compression_bptc' );

			if ( extension !== null ) {

				if ( p === RGBA_BPTC_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB_ALPHA_BPTC_UNORM_EXT : extension.COMPRESSED_RGBA_BPTC_UNORM_EXT;

			} else {

				return null;

			}

		}

		// RGTC

		if ( p === RED_RGTC1_Format || p === SIGNED_RED_RGTC1_Format || p === RED_GREEN_RGTC2_Format || p === SIGNED_RED_GREEN_RGTC2_Format ) {

			extension = extensions.get( 'EXT_texture_compression_rgtc' );

			if ( extension !== null ) {

				if ( p === RGBA_BPTC_Format ) return extension.COMPRESSED_RED_RGTC1_EXT;
				if ( p === SIGNED_RED_RGTC1_Format ) return extension.COMPRESSED_SIGNED_RED_RGTC1_EXT;
				if ( p === RED_GREEN_RGTC2_Format ) return extension.COMPRESSED_RED_GREEN_RGTC2_EXT;
				if ( p === SIGNED_RED_GREEN_RGTC2_Format ) return extension.COMPRESSED_SIGNED_RED_GREEN_RGTC2_EXT;

			} else {

				return null;

			}

		}

		//

		if ( p === UnsignedInt248Type ) {

			return gl.UNSIGNED_INT_24_8;

		}

		// if "p" can't be resolved, assume the user defines a WebGL constant as a string (fallback/workaround for packed RGB formats)

		return ( gl[ p ] !== undefined ) ? gl[ p ] : null;

	}

	_clientWaitAsync() {

		const { gl } = this;

		const sync = gl.fenceSync( gl.SYNC_GPU_COMMANDS_COMPLETE, 0 );

		gl.flush();

		return new Promise( ( resolve, reject ) => {

			function test() {

				const res = gl.clientWaitSync( sync, gl.SYNC_FLUSH_COMMANDS_BIT, 0 );

				if ( res === gl.WAIT_FAILED ) {

					gl.deleteSync( sync );

					reject();
					return;

				}

				if ( res === gl.TIMEOUT_EXPIRED ) {

					requestAnimationFrame( test );
					return;

				}

				gl.deleteSync( sync );

				resolve();

			}

			test();

		} );

	}

}

let initialized = false, wrappingToGL, filterToGL, compareToGL;

class WebGLTextureUtils {

	constructor( backend ) {

		this.backend = backend;

		this.gl = backend.gl;
		this.extensions = backend.extensions;
		this.defaultTextures = {};

		if ( initialized === false ) {

			this._init( this.gl );

			initialized = true;

		}

	}

	_init( gl ) {

		// Store only WebGL constants here.

		wrappingToGL = {
			[ RepeatWrapping ]: gl.REPEAT,
			[ ClampToEdgeWrapping ]: gl.CLAMP_TO_EDGE,
			[ MirroredRepeatWrapping ]: gl.MIRRORED_REPEAT
		};

		filterToGL = {
			[ NearestFilter ]: gl.NEAREST,
			[ NearestMipmapNearestFilter ]: gl.NEAREST_MIPMAP_NEAREST,
			[ NearestMipmapLinearFilter ]: gl.NEAREST_MIPMAP_LINEAR,

			[ LinearFilter ]: gl.LINEAR,
			[ LinearMipmapNearestFilter ]: gl.LINEAR_MIPMAP_NEAREST,
			[ LinearMipmapLinearFilter ]: gl.LINEAR_MIPMAP_LINEAR
		};

		compareToGL = {
			[ NeverCompare ]: gl.NEVER,
			[ AlwaysCompare ]: gl.ALWAYS,
			[ LessCompare ]: gl.LESS,
			[ LessEqualCompare ]: gl.LEQUAL,
			[ EqualCompare ]: gl.EQUAL,
			[ GreaterEqualCompare ]: gl.GEQUAL,
			[ GreaterCompare ]: gl.GREATER,
			[ NotEqualCompare ]: gl.NOTEQUAL
		};

	}

	filterFallback( f ) {

		const { gl } = this;

		if ( f === NearestFilter || f === NearestMipmapNearestFilter || f === NearestMipmapLinearFilter ) {

			return gl.NEAREST;

		}

		return gl.LINEAR;

	}

	getGLTextureType( texture ) {

		const { gl } = this;

		let glTextureType;

		if ( texture.isCubeTexture === true ) {

			glTextureType = gl.TEXTURE_CUBE_MAP;

		} else if ( texture.isDataArrayTexture === true ) {

			glTextureType = gl.TEXTURE_2D_ARRAY;

		} else if ( texture.isData3DTexture === true ) {

			glTextureType = gl.TEXTURE_3D;

		} else {

			glTextureType = gl.TEXTURE_2D;


		}

		return glTextureType;

	}

	getInternalFormat( internalFormatName, glFormat, glType, colorSpace, forceLinearTransfer = false ) {

		const { gl, extensions } = this;

		if ( internalFormatName !== null ) {

			if ( gl[ internalFormatName ] !== undefined ) return gl[ internalFormatName ];

			console.warn( 'THREE.WebGLRenderer: Attempt to use non-existing WebGL internal format \'' + internalFormatName + '\'' );

		}

		let internalFormat = glFormat;

		if ( glFormat === gl.RED ) {

			if ( glType === gl.FLOAT ) internalFormat = gl.R32F;
			if ( glType === gl.HALF_FLOAT ) internalFormat = gl.R16F;
			if ( glType === gl.UNSIGNED_BYTE ) internalFormat = gl.R8;
			if ( glType === gl.UNSIGNED_SHORT ) internalFormat = gl.R16;
			if ( glType === gl.UNSIGNED_INT ) internalFormat = gl.R32UI;
			if ( glType === gl.BYTE ) internalFormat = gl.R8I;
			if ( glType === gl.SHORT ) internalFormat = gl.R16I;
			if ( glType === gl.INT ) internalFormat = gl.R32I;

		}

		if ( glFormat === gl.RED_INTEGER ) {

			if ( glType === gl.UNSIGNED_BYTE ) internalFormat = gl.R8UI;
			if ( glType === gl.UNSIGNED_SHORT ) internalFormat = gl.R16UI;
			if ( glType === gl.UNSIGNED_INT ) internalFormat = gl.R32UI;
			if ( glType === gl.BYTE ) internalFormat = gl.R8I;
			if ( glType === gl.SHORT ) internalFormat = gl.R16I;
			if ( glType === gl.INT ) internalFormat = gl.R32I;

		}

		if ( glFormat === gl.RG ) {

			if ( glType === gl.FLOAT ) internalFormat = gl.RG32F;
			if ( glType === gl.HALF_FLOAT ) internalFormat = gl.RG16F;
			if ( glType === gl.UNSIGNED_BYTE ) internalFormat = gl.RG8;
			if ( glType === gl.UNSIGNED_SHORT ) internalFormat = gl.RG16;
			if ( glType === gl.UNSIGNED_INT ) internalFormat = gl.RG32UI;
			if ( glType === gl.BYTE ) internalFormat = gl.RG8I;
			if ( glType === gl.SHORT ) internalFormat = gl.RG16I;
			if ( glType === gl.INT ) internalFormat = gl.RG32I;

		}

		if ( glFormat === gl.RG_INTEGER ) {

			if ( glType === gl.UNSIGNED_BYTE ) internalFormat = gl.RG8UI;
			if ( glType === gl.UNSIGNED_SHORT ) internalFormat = gl.RG16UI;
			if ( glType === gl.UNSIGNED_INT ) internalFormat = gl.RG32UI;
			if ( glType === gl.BYTE ) internalFormat = gl.RG8I;
			if ( glType === gl.SHORT ) internalFormat = gl.RG16I;
			if ( glType === gl.INT ) internalFormat = gl.RG32I;

		}

		if ( glFormat === gl.RGB ) {

			if ( glType === gl.FLOAT ) internalFormat = gl.RGB32F;
			if ( glType === gl.HALF_FLOAT ) internalFormat = gl.RGB16F;
			if ( glType === gl.UNSIGNED_BYTE ) internalFormat = gl.RGB8;
			if ( glType === gl.UNSIGNED_SHORT ) internalFormat = gl.RGB16;
			if ( glType === gl.UNSIGNED_INT ) internalFormat = gl.RGB32UI;
			if ( glType === gl.BYTE ) internalFormat = gl.RGB8I;
			if ( glType === gl.SHORT ) internalFormat = gl.RGB16I;
			if ( glType === gl.INT ) internalFormat = gl.RGB32I;
			if ( glType === gl.UNSIGNED_BYTE ) internalFormat = ( colorSpace === SRGBColorSpace && forceLinearTransfer === false ) ? gl.SRGB8 : gl.RGB8;
			if ( glType === gl.UNSIGNED_SHORT_5_6_5 ) internalFormat = gl.RGB565;
			if ( glType === gl.UNSIGNED_SHORT_5_5_5_1 ) internalFormat = gl.RGB5_A1;
			if ( glType === gl.UNSIGNED_SHORT_4_4_4_4 ) internalFormat = gl.RGB4;
			if ( glType === gl.UNSIGNED_INT_5_9_9_9_REV ) internalFormat = gl.RGB9_E5;

		}

		if ( glFormat === gl.RGB_INTEGER ) {

			if ( glType === gl.UNSIGNED_BYTE ) internalFormat = gl.RGB8UI;
			if ( glType === gl.UNSIGNED_SHORT ) internalFormat = gl.RGB16UI;
			if ( glType === gl.UNSIGNED_INT ) internalFormat = gl.RGB32UI;
			if ( glType === gl.BYTE ) internalFormat = gl.RGB8I;
			if ( glType === gl.SHORT ) internalFormat = gl.RGB16I;
			if ( glType === gl.INT ) internalFormat = gl.RGB32I;

		}

		if ( glFormat === gl.RGBA ) {

			if ( glType === gl.FLOAT ) internalFormat = gl.RGBA32F;
			if ( glType === gl.HALF_FLOAT ) internalFormat = gl.RGBA16F;
			if ( glType === gl.UNSIGNED_BYTE ) internalFormat = gl.RGBA8;
			if ( glType === gl.UNSIGNED_SHORT ) internalFormat = gl.RGBA16;
			if ( glType === gl.UNSIGNED_INT ) internalFormat = gl.RGBA32UI;
			if ( glType === gl.BYTE ) internalFormat = gl.RGBA8I;
			if ( glType === gl.SHORT ) internalFormat = gl.RGBA16I;
			if ( glType === gl.INT ) internalFormat = gl.RGBA32I;
			if ( glType === gl.UNSIGNED_BYTE ) internalFormat = ( colorSpace === SRGBColorSpace && forceLinearTransfer === false ) ? gl.SRGB8_ALPHA8 : gl.RGBA8;
			if ( glType === gl.UNSIGNED_SHORT_4_4_4_4 ) internalFormat = gl.RGBA4;
			if ( glType === gl.UNSIGNED_SHORT_5_5_5_1 ) internalFormat = gl.RGB5_A1;

		}

		if ( glFormat === gl.RGBA_INTEGER ) {

			if ( glType === gl.UNSIGNED_BYTE ) internalFormat = gl.RGBA8UI;
			if ( glType === gl.UNSIGNED_SHORT ) internalFormat = gl.RGBA16UI;
			if ( glType === gl.UNSIGNED_INT ) internalFormat = gl.RGBA32UI;
			if ( glType === gl.BYTE ) internalFormat = gl.RGBA8I;
			if ( glType === gl.SHORT ) internalFormat = gl.RGBA16I;
			if ( glType === gl.INT ) internalFormat = gl.RGBA32I;

		}

		if ( glFormat === gl.DEPTH_COMPONENT ) {

			if ( glType === gl.UNSIGNED_INT ) internalFormat = gl.DEPTH24_STENCIL8;
			if ( glType === gl.FLOAT ) internalFormat = gl.DEPTH_COMPONENT32F;

		}

		if ( glFormat === gl.DEPTH_STENCIL ) {

			if ( glType === gl.UNSIGNED_INT_24_8 ) internalFormat = gl.DEPTH24_STENCIL8;

		}

		if ( internalFormat === gl.R16F || internalFormat === gl.R32F ||
			internalFormat === gl.RG16F || internalFormat === gl.RG32F ||
			internalFormat === gl.RGBA16F || internalFormat === gl.RGBA32F ) {

			extensions.get( 'EXT_color_buffer_float' );

		}

		return internalFormat;

	}

	setTextureParameters( textureType, texture ) {

		const { gl, extensions, backend } = this;

		const { currentAnisotropy } = backend.get( texture );

		gl.texParameteri( textureType, gl.TEXTURE_WRAP_S, wrappingToGL[ texture.wrapS ] );
		gl.texParameteri( textureType, gl.TEXTURE_WRAP_T, wrappingToGL[ texture.wrapT ] );

		if ( textureType === gl.TEXTURE_3D || textureType === gl.TEXTURE_2D_ARRAY ) {

			gl.texParameteri( textureType, gl.TEXTURE_WRAP_R, wrappingToGL[ texture.wrapR ] );

		}

		gl.texParameteri( textureType, gl.TEXTURE_MAG_FILTER, filterToGL[ texture.magFilter ] );


		// follow WebGPU backend mapping for texture filtering
		const minFilter = ! texture.isVideoTexture && texture.minFilter === LinearFilter ? LinearMipmapLinearFilter : texture.minFilter;

		gl.texParameteri( textureType, gl.TEXTURE_MIN_FILTER, filterToGL[ minFilter ] );

		if ( texture.compareFunction ) {

			gl.texParameteri( textureType, gl.TEXTURE_COMPARE_MODE, gl.COMPARE_REF_TO_TEXTURE );
			gl.texParameteri( textureType, gl.TEXTURE_COMPARE_FUNC, compareToGL[ texture.compareFunction ] );

		}

		if ( extensions.has( 'EXT_texture_filter_anisotropic' ) === true ) {

			if ( texture.magFilter === NearestFilter ) return;
			if ( texture.minFilter !== NearestMipmapLinearFilter && texture.minFilter !== LinearMipmapLinearFilter ) return;
			if ( texture.type === FloatType && extensions.has( 'OES_texture_float_linear' ) === false ) return; // verify extension for WebGL 1 and WebGL 2

			if ( texture.anisotropy > 1 || currentAnisotropy !== texture.anisotropy ) {

				const extension = extensions.get( 'EXT_texture_filter_anisotropic' );
				gl.texParameterf( textureType, extension.TEXTURE_MAX_ANISOTROPY_EXT, Math.min( texture.anisotropy, backend.getMaxAnisotropy() ) );
				backend.get( texture ).currentAnisotropy = texture.anisotropy;

			}

		}

	}

	createDefaultTexture( texture ) {

		const { gl, backend, defaultTextures } = this;


		const glTextureType = this.getGLTextureType( texture );

		let textureGPU = defaultTextures[ glTextureType ];

		if ( textureGPU === undefined ) {

			textureGPU = gl.createTexture();

			backend.state.bindTexture( glTextureType, textureGPU );
			gl.texParameteri( glTextureType, gl.TEXTURE_MIN_FILTER, gl.NEAREST );
			gl.texParameteri( glTextureType, gl.TEXTURE_MAG_FILTER, gl.NEAREST );

			// gl.texImage2D( glTextureType, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE, data );

			defaultTextures[ glTextureType ] = textureGPU;

		}

		backend.set( texture, {
			textureGPU,
			glTextureType,
			isDefault: true
		} );

	}

	createTexture( texture, options ) {

		const { gl, backend } = this;
		const { levels, width, height, depth } = options;

		const glFormat = backend.utils.convert( texture.format, texture.colorSpace );
		const glType = backend.utils.convert( texture.type );
		const glInternalFormat = this.getInternalFormat( texture.internalFormat, glFormat, glType, texture.colorSpace, texture.isVideoTexture );

		const textureGPU = gl.createTexture();
		const glTextureType = this.getGLTextureType( texture );

		backend.state.bindTexture( glTextureType, textureGPU );

		gl.pixelStorei( gl.UNPACK_FLIP_Y_WEBGL, texture.flipY );
		gl.pixelStorei( gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, texture.premultiplyAlpha );
		gl.pixelStorei( gl.UNPACK_ALIGNMENT, texture.unpackAlignment );
		gl.pixelStorei( gl.UNPACK_COLORSPACE_CONVERSION_WEBGL, gl.NONE );

		this.setTextureParameters( glTextureType, texture );

		if ( texture.isDataArrayTexture ) {

			gl.texStorage3D( gl.TEXTURE_2D_ARRAY, levels, glInternalFormat, width, height, depth );

		} else if ( texture.isData3DTexture ) {

			gl.texStorage3D( gl.TEXTURE_3D, levels, glInternalFormat, width, height, depth );

		} else if ( ! texture.isVideoTexture ) {

			gl.texStorage2D( glTextureType, levels, glInternalFormat, width, height );

		}

		backend.set( texture, {
			textureGPU,
			glTextureType,
			glFormat,
			glType,
			glInternalFormat
		} );

	}

	copyBufferToTexture( buffer, texture ) {

		const { gl, backend } = this;

		const { textureGPU, glTextureType, glFormat, glType } = backend.get( texture );

		const { width, height } = texture.source.data;

		gl.bindBuffer( gl.PIXEL_UNPACK_BUFFER, buffer );

		backend.state.bindTexture( glTextureType, textureGPU );

		gl.pixelStorei( gl.UNPACK_FLIP_Y_WEBGL, false );
		gl.pixelStorei( gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, false );
		gl.texSubImage2D( glTextureType, 0, 0, 0, width, height, glFormat, glType, 0 );

		gl.bindBuffer( gl.PIXEL_UNPACK_BUFFER, null );

		backend.state.unbindTexture();
		// debug
		// const framebuffer = gl.createFramebuffer();
		// gl.bindFramebuffer( gl.FRAMEBUFFER, framebuffer );
		// gl.framebufferTexture2D( gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, glTextureType, textureGPU, 0 );

		// const readout = new Float32Array( width * height * 4 );

		// const altFormat = gl.getParameter( gl.IMPLEMENTATION_COLOR_READ_FORMAT );
		// const altType = gl.getParameter( gl.IMPLEMENTATION_COLOR_READ_TYPE );

		// gl.readPixels( 0, 0, width, height, altFormat, altType, readout );
		// gl.bindFramebuffer( gl.FRAMEBUFFER, null );
		// console.log( readout );

	}

	updateTexture( texture, options ) {

		const { gl } = this;
		const { width, height } = options;
		const { textureGPU, glTextureType, glFormat, glType, glInternalFormat } = this.backend.get( texture );

		if ( texture.isRenderTargetTexture || ( textureGPU === undefined /* unsupported texture format */ ) )
			return;

		const getImage = ( source ) => {

			if ( source.isDataTexture ) {

				return source.image.data;

			} else if ( source instanceof ImageBitmap || source instanceof OffscreenCanvas || source instanceof HTMLImageElement || source instanceof HTMLCanvasElement ) {

				return source;

			}

			return source.data;

		};

		this.backend.state.bindTexture( glTextureType, textureGPU );

		if ( texture.isCompressedTexture ) {

			const mipmaps = texture.mipmaps;

			for ( let i = 0; i < mipmaps.length; i ++ ) {

				const mipmap = mipmaps[ i ];

				if ( texture.isCompressedArrayTexture ) {

					const image = options.image;

					if ( texture.format !== gl.RGBA ) {

						if ( glFormat !== null ) {

							gl.compressedTexSubImage3D( gl.TEXTURE_2D_ARRAY, i, 0, 0, 0, mipmap.width, mipmap.height, image.depth, glFormat, mipmap.data, 0, 0 );


						} else {

							console.warn( 'THREE.WebGLRenderer: Attempt to load unsupported compressed texture format in .uploadTexture()' );

						}

					} else {

						gl.texSubImage3D( gl.TEXTURE_2D_ARRAY, i, 0, 0, 0, mipmap.width, mipmap.height, image.depth, glFormat, glType, mipmap.data );

					}

				} else {

					if ( glFormat !== null ) {

						gl.compressedTexSubImage2D( gl.TEXTURE_2D, i, 0, 0, mipmap.width, mipmap.height, glFormat, mipmap.data );

					} else {

						console.warn( 'Unsupported compressed texture format' );

					}

				}

			}

		} else if ( texture.isCubeTexture ) {

			const images = options.images;

			for ( let i = 0; i < 6; i ++ ) {

				const image = getImage( images[ i ] );

				gl.texSubImage2D( gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, 0, 0, width, height, glFormat, glType, image );

			}

		} else if ( texture.isDataArrayTexture ) {

			const image = options.image;

			gl.texSubImage3D( gl.TEXTURE_2D_ARRAY, 0, 0, 0, 0, image.width, image.height, image.depth, glFormat, glType, image.data );

		} else if ( texture.isData3DTexture ) {

			const image = options.image;

			gl.texSubImage3D( gl.TEXTURE_3D, 0, 0, 0, 0, image.width, image.height, image.depth, glFormat, glType, image.data );

		} else if ( texture.isVideoTexture ) {

			texture.update();

			gl.texImage2D( glTextureType, 0, glInternalFormat, glFormat, glType, options.image );


		} else {

			const image = getImage( options.image );

			gl.texSubImage2D( glTextureType, 0, 0, 0, width, height, glFormat, glType, image );

		}

	}

	generateMipmaps( texture ) {

		const { gl, backend } = this;
		const { textureGPU, glTextureType } = backend.get( texture );

		backend.state.bindTexture( glTextureType, textureGPU );
		gl.generateMipmap( glTextureType );

	}

	deallocateRenderBuffers( renderTarget ) {


		const { gl, backend } = this;

		// remove framebuffer reference
		if ( renderTarget ) {

			const renderContextData = backend.get( renderTarget );

			renderContextData.renderBufferStorageSetup = undefined;

			if ( renderContextData.framebuffer ) {

				gl.deleteFramebuffer( renderContextData.framebuffer );
				renderContextData.framebuffer = undefined;

			}

			if ( renderContextData.depthRenderbuffer ) {

				gl.deleteRenderbuffer( renderContextData.depthRenderbuffer );
				renderContextData.depthRenderbuffer = undefined;

			}

			if ( renderContextData.stencilRenderbuffer ) {

				gl.deleteRenderbuffer( renderContextData.stencilRenderbuffer );
				renderContextData.stencilRenderbuffer = undefined;

			}

			if ( renderContextData.msaaFrameBuffer ) {

				gl.deleteFramebuffer( renderContextData.msaaFrameBuffer );
				renderContextData.msaaFrameBuffer = undefined;

			}

			if ( renderContextData.msaaRenderbuffers ) {

				for ( let i = 0; i < renderContextData.msaaRenderbuffers.length; i ++ ) {

					gl.deleteRenderbuffer( renderContextData.msaaRenderbuffers[ i ] );

				}

				renderContextData.msaaRenderbuffers = undefined;

			}

		}

	}

	destroyTexture( texture ) {

		const { gl, backend } = this;
		const { textureGPU, renderTarget } = backend.get( texture );

		this.deallocateRenderBuffers( renderTarget );
		gl.deleteTexture( textureGPU );

		backend.delete( texture );

	}

	copyTextureToTexture( srcTexture, dstTexture, srcRegion = null, dstPosition = null, level = 0 ) {

		const { gl, backend } = this;
		const { state } = this.backend;

		const { textureGPU: dstTextureGPU, glTextureType, glType, glFormat } = backend.get( dstTexture );


		let width, height, minX, minY;
		let dstX, dstY;
		if ( srcRegion !== null ) {

			width = srcRegion.max.x - srcRegion.min.x;
			height = srcRegion.max.y - srcRegion.min.y;
			minX = srcRegion.min.x;
			minY = srcRegion.min.y;

		} else {

			width = srcTexture.image.width;
			height = srcTexture.image.height;
			minX = 0;
			minY = 0;

		}

		if ( dstPosition !== null ) {

			dstX = dstPosition.x;
			dstY = dstPosition.y;

		} else {

			dstX = 0;
			dstY = 0;

		}

		state.bindTexture( glTextureType, dstTextureGPU );

		// As another texture upload may have changed pixelStorei
		// parameters, make sure they are correct for the dstTexture
		gl.pixelStorei( gl.UNPACK_ALIGNMENT, dstTexture.unpackAlignment );
		gl.pixelStorei( gl.UNPACK_FLIP_Y_WEBGL, dstTexture.flipY );
		gl.pixelStorei( gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, dstTexture.premultiplyAlpha );
		gl.pixelStorei( gl.UNPACK_ALIGNMENT, dstTexture.unpackAlignment );

		const currentUnpackRowLen = gl.getParameter( gl.UNPACK_ROW_LENGTH );
		const currentUnpackImageHeight = gl.getParameter( gl.UNPACK_IMAGE_HEIGHT );
		const currentUnpackSkipPixels = gl.getParameter( gl.UNPACK_SKIP_PIXELS );
		const currentUnpackSkipRows = gl.getParameter( gl.UNPACK_SKIP_ROWS );
		const currentUnpackSkipImages = gl.getParameter( gl.UNPACK_SKIP_IMAGES );

		const image = srcTexture.isCompressedTexture ? srcTexture.mipmaps[ level ] : srcTexture.image;

		gl.pixelStorei( gl.UNPACK_ROW_LENGTH, image.width );
		gl.pixelStorei( gl.UNPACK_IMAGE_HEIGHT, image.height );
		gl.pixelStorei( gl.UNPACK_SKIP_PIXELS, minX );
		gl.pixelStorei( gl.UNPACK_SKIP_ROWS, minY );


		if ( srcTexture.isDataTexture ) {

			gl.texSubImage2D( gl.TEXTURE_2D, level, dstX, dstY, width, height, glFormat, glType, image.data );

		} else {

			if ( srcTexture.isCompressedTexture ) {

				gl.compressedTexSubImage2D( gl.TEXTURE_2D, level, dstX, dstY, image.width, image.height, glFormat, image.data );

			} else {

				gl.texSubImage2D( gl.TEXTURE_2D, level, dstX, dstY, width, height, glFormat, glType, image );

			}

		}

		gl.pixelStorei( gl.UNPACK_ROW_LENGTH, currentUnpackRowLen );
		gl.pixelStorei( gl.UNPACK_IMAGE_HEIGHT, currentUnpackImageHeight );
		gl.pixelStorei( gl.UNPACK_SKIP_PIXELS, currentUnpackSkipPixels );
		gl.pixelStorei( gl.UNPACK_SKIP_ROWS, currentUnpackSkipRows );
		gl.pixelStorei( gl.UNPACK_SKIP_IMAGES, currentUnpackSkipImages );

		// Generate mipmaps only when copying level 0
		if ( level === 0 && dstTexture.generateMipmaps ) gl.generateMipmap( gl.TEXTURE_2D );

		state.unbindTexture();

	}

	copyFramebufferToTexture( texture, renderContext ) {

		const { gl } = this;
		const { state } = this.backend;

		const { textureGPU } = this.backend.get( texture );

		const width = texture.image.width;
		const height = texture.image.height;

		const requireDrawFrameBuffer = texture.isDepthTexture === true || ( renderContext.renderTarget && renderContext.renderTarget.samples > 0 );

		if ( requireDrawFrameBuffer ) {

			let mask;
			let attachment;

			if ( texture.isDepthTexture === true ) {

				mask = gl.DEPTH_BUFFER_BIT;
				attachment = gl.DEPTH_ATTACHMENT;

				if ( renderContext.stencil ) {

					mask |= gl.STENCIL_BUFFER_BIT;

				}

			} else {

				mask = gl.COLOR_BUFFER_BIT;
				attachment = gl.COLOR_ATTACHMENT0;

			}

			const fb = gl.createFramebuffer();
			state.bindFramebuffer( gl.DRAW_FRAMEBUFFER, fb );

			gl.framebufferTexture2D( gl.DRAW_FRAMEBUFFER, attachment, gl.TEXTURE_2D, textureGPU, 0 );

			gl.blitFramebuffer( 0, 0, width, height, 0, 0, width, height, mask, gl.NEAREST );

			gl.deleteFramebuffer( fb );

		} else {

			state.bindTexture( gl.TEXTURE_2D, textureGPU );
			gl.copyTexSubImage2D( gl.TEXTURE_2D, 0, 0, 0, 0, 0, width, height );

			state.unbindTexture();

		}

		if ( texture.generateMipmaps ) this.generateMipmaps( texture );

		this.backend._setFramebuffer( renderContext );

	}

	// Setup storage for internal depth/stencil buffers and bind to correct framebuffer
	setupRenderBufferStorage( renderbuffer, renderContext ) {

		const { gl } = this;
		const renderTarget = renderContext.renderTarget;

		const { samples, depthTexture, depthBuffer, stencilBuffer, width, height } = renderTarget;

		gl.bindRenderbuffer( gl.RENDERBUFFER, renderbuffer );

		if ( depthBuffer && ! stencilBuffer ) {

			let glInternalFormat = gl.DEPTH_COMPONENT24;

			if ( samples > 0 ) {

				if ( depthTexture && depthTexture.isDepthTexture ) {

					if ( depthTexture.type === gl.FLOAT ) {

						glInternalFormat = gl.DEPTH_COMPONENT32F;

					}

				}

				gl.renderbufferStorageMultisample( gl.RENDERBUFFER, samples, glInternalFormat, width, height );

			} else {

				gl.renderbufferStorage( gl.RENDERBUFFER, glInternalFormat, width, height );

			}

			gl.framebufferRenderbuffer( gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT, gl.RENDERBUFFER, renderbuffer );

		} else if ( depthBuffer && stencilBuffer ) {

			if ( samples > 0 ) {

				gl.renderbufferStorageMultisample( gl.RENDERBUFFER, samples, gl.DEPTH24_STENCIL8, width, height );

			} else {

				gl.renderbufferStorage( gl.RENDERBUFFER, gl.DEPTH_STENCIL, width, height );

			}


			gl.framebufferRenderbuffer( gl.FRAMEBUFFER, gl.DEPTH_STENCIL_ATTACHMENT, gl.RENDERBUFFER, renderbuffer );

		}

	}

	async copyTextureToBuffer( texture, x, y, width, height ) {

		const { backend, gl } = this;

		const { textureGPU, glFormat, glType } = this.backend.get( texture );

		const fb = gl.createFramebuffer();

		gl.bindFramebuffer( gl.READ_FRAMEBUFFER, fb );
		gl.framebufferTexture2D( gl.READ_FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, textureGPU, 0 );

		const typedArrayType = this._getTypedArrayType( glType );
		const bytesPerTexel = this._getBytesPerTexel( glFormat );

		const elementCount = width * height;
		const byteLength = elementCount * bytesPerTexel;

		const buffer = gl.createBuffer();

		gl.bindBuffer( gl.PIXEL_PACK_BUFFER, buffer );
		gl.bufferData( gl.PIXEL_PACK_BUFFER, byteLength, gl.STREAM_READ );
		gl.readPixels( x, y, width, height, glFormat, glType, 0 );
		gl.bindBuffer( gl.PIXEL_PACK_BUFFER, null );

		await backend.utils._clientWaitAsync();

		const dstBuffer = new typedArrayType( byteLength / typedArrayType.BYTES_PER_ELEMENT );

		gl.bindBuffer( gl.PIXEL_PACK_BUFFER, buffer );
		gl.getBufferSubData( gl.PIXEL_PACK_BUFFER, 0, dstBuffer );
		gl.bindBuffer( gl.PIXEL_PACK_BUFFER, null );

		gl.deleteFramebuffer( fb );

		return dstBuffer;

	}

	_getTypedArrayType( glType ) {

		const { gl } = this;

		if ( glType === gl.UNSIGNED_BYTE ) return Uint8Array;

		if ( glType === gl.UNSIGNED_SHORT_4_4_4_4 ) return Uint16Array;
		if ( glType === gl.UNSIGNED_SHORT_5_5_5_1 ) return Uint16Array;
		if ( glType === gl.UNSIGNED_SHORT_5_6_5 ) return Uint16Array;
		if ( glType === gl.UNSIGNED_SHORT ) return Uint16Array;
		if ( glType === gl.UNSIGNED_INT ) return Uint32Array;

		if ( glType === gl.FLOAT ) return Float32Array;

		throw new Error( `Unsupported WebGL type: ${glType}` );

	}

	_getBytesPerTexel( glFormat ) {

		const { gl } = this;

		if ( glFormat === gl.RGBA ) return 4;
		if ( glFormat === gl.RGB ) return 3;
		if ( glFormat === gl.ALPHA ) return 1;

	}

}

class WebGLExtensions {

	constructor( backend ) {

		this.backend = backend;

		this.gl = this.backend.gl;
		this.availableExtensions = this.gl.getSupportedExtensions();

		this.extensions = {};

	}

	get( name ) {

		let extension = this.extensions[ name ];

		if ( extension === undefined ) {

			extension = this.gl.getExtension( name );

			this.extensions[ name ] = extension;

		}

		return extension;

	}

	has( name ) {

		return this.availableExtensions.includes( name );

	}

}

class WebGLCapabilities {

	constructor( backend ) {

		this.backend = backend;

		this.maxAnisotropy = null;

	}

	getMaxAnisotropy() {

		if ( this.maxAnisotropy !== null ) return this.maxAnisotropy;

		const gl = this.backend.gl;
		const extensions = this.backend.extensions;

		if ( extensions.has( 'EXT_texture_filter_anisotropic' ) === true ) {

			const extension = extensions.get( 'EXT_texture_filter_anisotropic' );

			this.maxAnisotropy = gl.getParameter( extension.MAX_TEXTURE_MAX_ANISOTROPY_EXT );

		} else {

			this.maxAnisotropy = 0;

		}

		return this.maxAnisotropy;

	}

}

const GLFeatureName = {

	'WEBGL_multi_draw': 'WEBGL_multi_draw',
	'WEBGL_compressed_texture_astc': 'texture-compression-astc',
	'WEBGL_compressed_texture_etc': 'texture-compression-etc2',
	'WEBGL_compressed_texture_etc1': 'texture-compression-etc1',
	'WEBGL_compressed_texture_pvrtc': 'texture-compression-pvrtc',
	'WEBKIT_WEBGL_compressed_texture_pvrtc': 'texture-compression-pvrtc',
	'WEBGL_compressed_texture_s3tc': 'texture-compression-bc',
	'EXT_texture_compression_bptc': 'texture-compression-bptc',
	'EXT_disjoint_timer_query_webgl2': 'timestamp-query',

};

class WebGLBufferRenderer {

	constructor( backend ) {

		this.gl = backend.gl;
		this.extensions = backend.extensions;
		this.info = backend.renderer.info;
		this.mode = null;
		this.index = 0;
		this.type = null;
		this.object = null;

	}

	render( start, count ) {

		const { gl, mode, object, type, info, index } = this;

		if ( index !== 0 ) {

			gl.drawElements( mode, count, type, start );

		} else {

			gl.drawArrays( mode, start, count );

		}

		info.update( object, count, mode, 1 );

	}

	renderInstances( start, count, primcount ) {

		const { gl, mode, type, index, object, info } = this;

		if ( primcount === 0 ) return;

		if ( index !== 0 ) {

			gl.drawElementsInstanced( mode, count, type, start, primcount );

		} else {

			gl.drawArraysInstanced( mode, start, count, primcount );

		}

		info.update( object, count, mode, primcount );

	}

	renderMultiDraw( starts, counts, drawCount ) {

		const { extensions, mode, object, info } = this;

		if ( drawCount === 0 ) return;

		const extension = extensions.get( 'WEBGL_multi_draw' );

		if ( extension === null ) {

			for ( let i = 0; i < drawCount; i ++ ) {

				this.render( starts[ i ], counts[ i ] );

			}

		} else {

			if ( this.index !== 0 ) {

				extension.multiDrawElementsWEBGL( mode, counts, 0, this.type, starts, 0, drawCount );

			} else {

				extension.multiDrawArraysWEBGL( mode, starts, 0, counts, 0, drawCount );

			}

			let elementCount = 0;
			for ( let i = 0; i < drawCount; i ++ ) {

				elementCount += counts[ i ];

			}

			info.update( object, elementCount, mode, 1 );

		}

	}

	renderMultiDrawInstances( starts, counts, drawCount, primcount ) {

		const { extensions, mode, object, info } = this;

		if ( drawCount === 0 ) return;

		const extension = extensions.get( 'WEBGL_multi_draw' );

		if ( extension === null ) {

			for ( let i = 0; i < drawCount; i ++ ) {

				this.renderInstances( starts[ i ], counts[ i ], primcount[ i ] );

			}

		} else {

			if ( this.index !== 0 ) {

				extension.multiDrawElementsInstancedWEBGL( mode, counts, 0, this.type, starts, 0, primcount, 0, drawCount );

			} else {

				extension.multiDrawArraysInstancedWEBGL( mode, starts, 0, counts, 0, primcount, 0, drawCount );

			}

			let elementCount = 0;

			for ( let i = 0; i < drawCount; i ++ ) {

				elementCount += counts[ i ];

			}

			for ( let i = 0; i < primcount.length; i ++ ) {

				info.update( object, elementCount, mode, primcount[ i ] );

			}

		}

	}

	//

}

//

class WebGLBackend extends Backend {

	constructor( parameters = {} ) {

		super( parameters );

		this.isWebGLBackend = true;

	}

	init( renderer ) {

		super.init( renderer );

		//

		const parameters = this.parameters;

		const glContext = ( parameters.context !== undefined ) ? parameters.context : renderer.domElement.getContext( 'webgl2' );

		this.gl = glContext;

		this.extensions = new WebGLExtensions( this );
		this.capabilities = new WebGLCapabilities( this );
		this.attributeUtils = new WebGLAttributeUtils( this );
		this.textureUtils = new WebGLTextureUtils( this );
		this.bufferRenderer = new WebGLBufferRenderer( this );

		this.state = new WebGLState( this );
		this.utils = new WebGLUtils( this );

		this.vaoCache = {};
		this.transformFeedbackCache = {};
		this.discard = false;
		this.trackTimestamp = ( parameters.trackTimestamp === true );

		this.extensions.get( 'EXT_color_buffer_float' );
		this.extensions.get( 'WEBGL_multi_draw' );

		this.disjoint = this.extensions.get( 'EXT_disjoint_timer_query_webgl2' );
		this.parallel = this.extensions.get( 'KHR_parallel_shader_compile' );
		this._currentContext = null;

	}

	get coordinateSystem() {

		return WebGLCoordinateSystem;

	}

	async getArrayBufferAsync( attribute ) {

		return await this.attributeUtils.getArrayBufferAsync( attribute );

	}


	initTimestampQuery( renderContext ) {

		if ( ! this.disjoint || ! this.trackTimestamp ) return;

		const renderContextData = this.get( renderContext );

		if ( this.queryRunning ) {

		  if ( ! renderContextData.queryQueue ) renderContextData.queryQueue = [];
		  renderContextData.queryQueue.push( renderContext );
		  return;

		}

		if ( renderContextData.activeQuery ) {

		  this.gl.endQuery( this.disjoint.TIME_ELAPSED_EXT );
		  renderContextData.activeQuery = null;

		}

		renderContextData.activeQuery = this.gl.createQuery();

		if ( renderContextData.activeQuery !== null ) {

		  this.gl.beginQuery( this.disjoint.TIME_ELAPSED_EXT, renderContextData.activeQuery );
		  this.queryRunning = true;

		}

	}

	// timestamp utils

	prepareTimestampBuffer( renderContext ) {

		if ( ! this.disjoint || ! this.trackTimestamp ) return;

		const renderContextData = this.get( renderContext );

		if ( renderContextData.activeQuery ) {

		  this.gl.endQuery( this.disjoint.TIME_ELAPSED_EXT );

		  if ( ! renderContextData.gpuQueries ) renderContextData.gpuQueries = [];
		  renderContextData.gpuQueries.push( { query: renderContextData.activeQuery } );
		  renderContextData.activeQuery = null;
		  this.queryRunning = false;

		  if ( renderContextData.queryQueue && renderContextData.queryQueue.length > 0 ) {

				const nextRenderContext = renderContextData.queryQueue.shift();
				this.initTimestampQuery( nextRenderContext );

			}

		}

	}

	  async resolveTimestampAsync( renderContext, type = 'render' ) {

		if ( ! this.disjoint || ! this.trackTimestamp ) return;

		const renderContextData = this.get( renderContext );

		if ( ! renderContextData.gpuQueries ) renderContextData.gpuQueries = [];

		for ( let i = 0; i < renderContextData.gpuQueries.length; i ++ ) {

		  const queryInfo = renderContextData.gpuQueries[ i ];
		  const available = this.gl.getQueryParameter( queryInfo.query, this.gl.QUERY_RESULT_AVAILABLE );
		  const disjoint = this.gl.getParameter( this.disjoint.GPU_DISJOINT_EXT );

		  if ( available && ! disjoint ) {

				const elapsed = this.gl.getQueryParameter( queryInfo.query, this.gl.QUERY_RESULT );
				const duration = Number( elapsed ) / 1000000; // Convert nanoseconds to milliseconds
				this.gl.deleteQuery( queryInfo.query );
				renderContextData.gpuQueries.splice( i, 1 ); // Remove the processed query
				i --;
				this.renderer.info.updateTimestamp( type, duration );

			}

		}

	}

	getContext() {

		return this.gl;

	}

	beginRender( renderContext ) {

		const { gl } = this;
		const renderContextData = this.get( renderContext );

		//

		//

		this.initTimestampQuery( renderContext );

		renderContextData.previousContext = this._currentContext;
		this._currentContext = renderContext;

		this._setFramebuffer( renderContext );

		this.clear( renderContext.clearColor, renderContext.clearDepth, renderContext.clearStencil, renderContext, false );

		//
		if ( renderContext.viewport ) {

			this.updateViewport( renderContext );

		} else {

			gl.viewport( 0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight );

		}

		if ( renderContext.scissor ) {

			const { x, y, width, height } = renderContext.scissorValue;

			gl.scissor( x, y, width, height );

		}

		const occlusionQueryCount = renderContext.occlusionQueryCount;

		if ( occlusionQueryCount > 0 ) {

			// Get a reference to the array of objects with queries. The renderContextData property
			// can be changed by another render pass before the async reading of all previous queries complete
			renderContextData.currentOcclusionQueries = renderContextData.occlusionQueries;
			renderContextData.currentOcclusionQueryObjects = renderContextData.occlusionQueryObjects;

			renderContextData.lastOcclusionObject = null;
			renderContextData.occlusionQueries = new Array( occlusionQueryCount );
			renderContextData.occlusionQueryObjects = new Array( occlusionQueryCount );
			renderContextData.occlusionQueryIndex = 0;

		}

	}

	finishRender( renderContext ) {

		const { gl, state } = this;
		const renderContextData = this.get( renderContext );
		const previousContext = renderContextData.previousContext;

		const textures = renderContext.textures;

		if ( textures !== null ) {

			for ( let i = 0; i < textures.length; i ++ ) {

				const texture = textures[ i ];

				if ( texture.generateMipmaps ) {

					this.generateMipmaps( texture );

				}

			}

		}

		this._currentContext = previousContext;


		if ( renderContext.textures !== null && renderContext.renderTarget ) {

			const renderTargetContextData = this.get( renderContext.renderTarget );

			const { samples } = renderContext.renderTarget;
			const fb = renderTargetContextData.framebuffer;

			const mask = gl.COLOR_BUFFER_BIT;

			if ( samples > 0 ) {

				const msaaFrameBuffer = renderTargetContextData.msaaFrameBuffer;

				const textures = renderContext.textures;

				state.bindFramebuffer( gl.READ_FRAMEBUFFER, msaaFrameBuffer );
				state.bindFramebuffer( gl.DRAW_FRAMEBUFFER, fb );

				for ( let i = 0; i < textures.length; i ++ ) {

					// TODO Add support for MRT

					gl.blitFramebuffer( 0, 0, renderContext.width, renderContext.height, 0, 0, renderContext.width, renderContext.height, mask, gl.NEAREST );

					gl.invalidateFramebuffer( gl.READ_FRAMEBUFFER, renderTargetContextData.invalidationArray );

				}

			}


		}

		if ( previousContext !== null ) {

			this._setFramebuffer( previousContext );

			if ( previousContext.viewport ) {

				this.updateViewport( previousContext );

			} else {

				const gl = this.gl;

				gl.viewport( 0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight );

			}

		}

		const occlusionQueryCount = renderContext.occlusionQueryCount;

		if ( occlusionQueryCount > 0 ) {

			const renderContextData = this.get( renderContext );

			if ( occlusionQueryCount > renderContextData.occlusionQueryIndex ) {

				const { gl } = this;

				gl.endQuery( gl.ANY_SAMPLES_PASSED );

			}

			this.resolveOccludedAsync( renderContext );

		}

		this.prepareTimestampBuffer( renderContext );

	}

	resolveOccludedAsync( renderContext ) {

		const renderContextData = this.get( renderContext );

		// handle occlusion query results

		const { currentOcclusionQueries, currentOcclusionQueryObjects } = renderContextData;

		if ( currentOcclusionQueries && currentOcclusionQueryObjects ) {

			const occluded = new WeakSet();
			const { gl } = this;

			renderContextData.currentOcclusionQueryObjects = null;
			renderContextData.currentOcclusionQueries = null;

			const check = () => {

				let completed = 0;

				// check all queries and requeue as appropriate
				for ( let i = 0; i < currentOcclusionQueries.length; i ++ ) {

					const query = currentOcclusionQueries[ i ];

					if ( query === null ) continue;

					if ( gl.getQueryParameter( query, gl.QUERY_RESULT_AVAILABLE ) ) {

						if ( gl.getQueryParameter( query, gl.QUERY_RESULT ) > 0 ) occluded.add( currentOcclusionQueryObjects[ i ] );

						currentOcclusionQueries[ i ] = null;
						gl.deleteQuery( query );

						completed ++;

					}

				}

				if ( completed < currentOcclusionQueries.length ) {

					requestAnimationFrame( check );

				} else {

					renderContextData.occluded = occluded;

				}

			};

			check();

		}

	}

	isOccluded( renderContext, object ) {

		const renderContextData = this.get( renderContext );

		return renderContextData.occluded && renderContextData.occluded.has( object );

	}

	updateViewport( renderContext ) {

		const gl = this.gl;
		const { x, y, width, height } = renderContext.viewportValue;

		gl.viewport( x, y, width, height );

	}

	setScissorTest( boolean ) {

		const gl = this.gl;

		if ( boolean ) {

			gl.enable( gl.SCISSOR_TEST );

		} else {

			gl.disable( gl.SCISSOR_TEST );

		}

	}

	clear( color, depth, stencil, descriptor = null, setFrameBuffer = true ) {

		const { gl } = this;

		if ( descriptor === null ) {

			descriptor = {
				textures: null,
				clearColorValue: this.getClearColor()
			};

		}

		//

		let clear = 0;

		if ( color ) clear |= gl.COLOR_BUFFER_BIT;
		if ( depth ) clear |= gl.DEPTH_BUFFER_BIT;
		if ( stencil ) clear |= gl.STENCIL_BUFFER_BIT;

		if ( clear !== 0 ) {

			const clearColor = descriptor.clearColorValue || this.getClearColor();

			if ( depth ) this.state.setDepthMask( true );

			if ( descriptor.textures === null ) {

				gl.clearColor( clearColor.r, clearColor.g, clearColor.b, clearColor.a );
				gl.clear( clear );

			} else {

				if ( setFrameBuffer ) this._setFramebuffer( descriptor );

				if ( color ) {

					for ( let i = 0; i < descriptor.textures.length; i ++ ) {

						gl.clearBufferfv( gl.COLOR, i, [ clearColor.r, clearColor.g, clearColor.b, clearColor.a ] );

					}

				}

				if ( depth && stencil ) {

					gl.clearBufferfi( gl.DEPTH_STENCIL, 0, 1, 0 );

				} else if ( depth ) {

					gl.clearBufferfv( gl.DEPTH, 0, [ 1.0 ] );

				} else if ( stencil ) {

					gl.clearBufferiv( gl.STENCIL, 0, [ 0 ] );

				}

			}

		}

	}

	beginCompute( computeGroup ) {

		const gl = this.gl;

		gl.bindFramebuffer( gl.FRAMEBUFFER, null );
		this.initTimestampQuery( computeGroup );

	}

	compute( computeGroup, computeNode, bindings, pipeline ) {

		const gl = this.gl;

		if ( ! this.discard ) {

			// required here to handle async behaviour of render.compute()
			gl.enable( gl.RASTERIZER_DISCARD );
			this.discard = true;

		}

		const { programGPU, transformBuffers, attributes } = this.get( pipeline );

		const vaoKey = this._getVaoKey( null, attributes );

		const vaoGPU = this.vaoCache[ vaoKey ];

		if ( vaoGPU === undefined ) {

			this._createVao( null, attributes );

		} else {

			gl.bindVertexArray( vaoGPU );

		}

		gl.useProgram( programGPU );

		this._bindUniforms( bindings );

		const transformFeedbackGPU = this._getTransformFeedback( transformBuffers );

		gl.bindTransformFeedback( gl.TRANSFORM_FEEDBACK, transformFeedbackGPU );
		gl.beginTransformFeedback( gl.POINTS );

		if ( attributes[ 0 ].isStorageInstancedBufferAttribute ) {

			gl.drawArraysInstanced( gl.POINTS, 0, 1, computeNode.count );

		} else {

			gl.drawArrays( gl.POINTS, 0, computeNode.count );

		}

		gl.endTransformFeedback();
		gl.bindTransformFeedback( gl.TRANSFORM_FEEDBACK, null );

		// switch active buffers

		for ( let i = 0; i < transformBuffers.length; i ++ ) {

			const dualAttributeData = transformBuffers[ i ];

			if ( dualAttributeData.pbo ) {

				this.textureUtils.copyBufferToTexture( dualAttributeData.transformBuffer, dualAttributeData.pbo );

			}

			dualAttributeData.switchBuffers();


		}

	}

	finishCompute( computeGroup ) {

		const gl = this.gl;

		this.discard = false;

		gl.disable( gl.RASTERIZER_DISCARD );

		this.prepareTimestampBuffer( computeGroup );

	}

	draw( renderObject/*, info*/ ) {

		const { object, pipeline, material, context } = renderObject;
		const { programGPU } = this.get( pipeline );

		const { gl, state } = this;

		const contextData = this.get( context );

		//

		this._bindUniforms( renderObject.getBindings() );

		const frontFaceCW = ( object.isMesh && object.matrixWorld.determinant() < 0 );

		state.setMaterial( material, frontFaceCW );

		gl.useProgram( programGPU );

		//

		let vaoGPU = renderObject.staticVao;

		if ( vaoGPU === undefined ) {

			const vaoKey = this._getVaoKey( renderObject.getIndex(), renderObject.getAttributes() );

			vaoGPU = this.vaoCache[ vaoKey ];

			if ( vaoGPU === undefined ) {

				let staticVao;

				( { vaoGPU, staticVao } = this._createVao( renderObject.getIndex(), renderObject.getAttributes() ) );

				if ( staticVao ) renderObject.staticVao = vaoGPU;

			}

		}

		gl.bindVertexArray( vaoGPU );

		//

		const index = renderObject.getIndex();

		const geometry = renderObject.geometry;
		const drawRange = renderObject.drawRange;
		const firstVertex = drawRange.start;

		//

		const lastObject = contextData.lastOcclusionObject;

		if ( lastObject !== object && lastObject !== undefined ) {

			if ( lastObject !== null && lastObject.occlusionTest === true ) {

				gl.endQuery( gl.ANY_SAMPLES_PASSED );

				contextData.occlusionQueryIndex ++;

			}

			if ( object.occlusionTest === true ) {

				const query = gl.createQuery();

				gl.beginQuery( gl.ANY_SAMPLES_PASSED, query );

				contextData.occlusionQueries[ contextData.occlusionQueryIndex ] = query;
				contextData.occlusionQueryObjects[ contextData.occlusionQueryIndex ] = object;

			}

			contextData.lastOcclusionObject = object;

		}

		//

		const renderer = this.bufferRenderer;

		if ( object.isPoints ) renderer.mode = gl.POINTS;
		else if ( object.isLineSegments ) renderer.mode = gl.LINES;
		else if ( object.isLine ) renderer.mode = gl.LINE_STRIP;
		else if ( object.isLineLoop ) renderer.mode = gl.LINE_LOOP;
		else {

			if ( material.wireframe === true ) {

				state.setLineWidth( material.wireframeLinewidth * this.renderer.getPixelRatio() );
				renderer.mode = gl.LINES;

			} else {

				renderer.mode = gl.TRIANGLES;

			}

		}

		//


		let count;

		renderer.object = object;

		if ( index !== null ) {

			const indexData = this.get( index );
			const indexCount = ( drawRange.count !== Infinity ) ? drawRange.count : index.count;

			renderer.index = index.count;
			renderer.type = indexData.type;

			count = indexCount;

		} else {

			renderer.index = 0;

			const vertexCount = ( drawRange.count !== Infinity ) ? drawRange.count : geometry.attributes.position.count;

			count = vertexCount;

		}

		const instanceCount = this.getInstanceCount( renderObject );

		if ( object.isBatchedMesh ) {

			if ( object._multiDrawInstances !== null ) {

				renderer.renderMultiDrawInstances( object._multiDrawStarts, object._multiDrawCounts, object._multiDrawCount, object._multiDrawInstances );

			} else if ( ! this.hasFeature( 'WEBGL_multi_draw' ) ) {

				warnOnce( 'THREE.WebGLRenderer: WEBGL_multi_draw not supported.' );

			} else {

				renderer.renderMultiDraw( object._multiDrawStarts, object._multiDrawCounts, object._multiDrawCount );

			}

		} else if ( instanceCount > 1 ) {

			renderer.renderInstances( firstVertex, count, instanceCount );

		} else {

			renderer.render( firstVertex, count );

		}
		//

		gl.bindVertexArray( null );

	}

	needsRenderUpdate( /*renderObject*/ ) {

		return false;

	}

	getRenderCacheKey( renderObject ) {

		return renderObject.id;

	}

	// textures

	createDefaultTexture( texture ) {

		this.textureUtils.createDefaultTexture( texture );

	}

	createTexture( texture, options ) {

		this.textureUtils.createTexture( texture, options );

	}

	updateTexture( texture, options ) {

		this.textureUtils.updateTexture( texture, options );

	}

	generateMipmaps( texture ) {

		this.textureUtils.generateMipmaps( texture );

	}


	destroyTexture( texture ) {

		this.textureUtils.destroyTexture( texture );

	}

	copyTextureToBuffer( texture, x, y, width, height ) {

		return this.textureUtils.copyTextureToBuffer( texture, x, y, width, height );

	}

	createSampler( /*texture*/ ) {

		//console.warn( 'Abstract class.' );

	}

	destroySampler() {}

	// node builder

	createNodeBuilder( object, renderer ) {

		return new GLSLNodeBuilder( object, renderer );

	}

	// program

	createProgram( program ) {

		const gl = this.gl;
		const { stage, code } = program;

		const shader = stage === 'fragment' ? gl.createShader( gl.FRAGMENT_SHADER ) : gl.createShader( gl.VERTEX_SHADER );

		gl.shaderSource( shader, code );
		gl.compileShader( shader );

		this.set( program, {
			shaderGPU: shader
		} );

	}

	destroyProgram( /*program*/ ) {

		console.warn( 'Abstract class.' );

	}

	createRenderPipeline( renderObject, promises ) {

		const gl = this.gl;
		const pipeline = renderObject.pipeline;

		// Program

		const { fragmentProgram, vertexProgram } = pipeline;

		const programGPU = gl.createProgram();

		const fragmentShader = this.get( fragmentProgram ).shaderGPU;
		const vertexShader = this.get( vertexProgram ).shaderGPU;

		gl.attachShader( programGPU, fragmentShader );
		gl.attachShader( programGPU, vertexShader );
		gl.linkProgram( programGPU );

		this.set( pipeline, {
			programGPU,
			fragmentShader,
			vertexShader
		} );

		if ( promises !== null && this.parallel ) {

			const p = new Promise( ( resolve /*, reject*/ ) => {

				const parallel = this.parallel;
				const checkStatus = () => {

					if ( gl.getProgramParameter( programGPU, parallel.COMPLETION_STATUS_KHR ) ) {

						this._completeCompile( renderObject, pipeline );
						resolve();

					} else {

						requestAnimationFrame( checkStatus );

					}

				};

				checkStatus();

			} );

			promises.push( p );

			return;

		}

		this._completeCompile( renderObject, pipeline );

	}

	_handleSource( string, errorLine ) {

		const lines = string.split( '\n' );
		const lines2 = [];

		const from = Math.max( errorLine - 6, 0 );
		const to = Math.min( errorLine + 6, lines.length );

		for ( let i = from; i < to; i ++ ) {

			const line = i + 1;
			lines2.push( `${line === errorLine ? '>' : ' '} ${line}: ${lines[ i ]}` );

		}

		return lines2.join( '\n' );

	}

	_getShaderErrors( gl, shader, type ) {

		const status = gl.getShaderParameter( shader, gl.COMPILE_STATUS );
		const errors = gl.getShaderInfoLog( shader ).trim();

		if ( status && errors === '' ) return '';

		const errorMatches = /ERROR: 0:(\d+)/.exec( errors );
		if ( errorMatches ) {

			const errorLine = parseInt( errorMatches[ 1 ] );
			return type.toUpperCase() + '\n\n' + errors + '\n\n' + this._handleSource( gl.getShaderSource( shader ), errorLine );

		} else {

			return errors;

		}

	}

	_logProgramError( programGPU, glFragmentShader, glVertexShader ) {

		if ( this.renderer.debug.checkShaderErrors ) {

			const gl = this.gl;

			const programLog = gl.getProgramInfoLog( programGPU ).trim();

			if ( gl.getProgramParameter( programGPU, gl.LINK_STATUS ) === false ) {


				if ( typeof this.renderer.debug.onShaderError === 'function' ) {

					this.renderer.debug.onShaderError( gl, programGPU, glVertexShader, glFragmentShader );

				} else {

					// default error reporting

					const vertexErrors = this._getShaderErrors( gl, glVertexShader, 'vertex' );
					const fragmentErrors = this._getShaderErrors( gl, glFragmentShader, 'fragment' );

					console.error(
						'THREE.WebGLProgram: Shader Error ' + gl.getError() + ' - ' +
						'VALIDATE_STATUS ' + gl.getProgramParameter( programGPU, gl.VALIDATE_STATUS ) + '\n\n' +
						'Program Info Log: ' + programLog + '\n' +
						vertexErrors + '\n' +
						fragmentErrors
					);

				}

			} else if ( programLog !== '' ) {

				console.warn( 'THREE.WebGLProgram: Program Info Log:', programLog );

			}

		}

	}

	_completeCompile( renderObject, pipeline ) {

		const gl = this.gl;
		const pipelineData = this.get( pipeline );
		const { programGPU, fragmentShader, vertexShader } = pipelineData;

		if ( gl.getProgramParameter( programGPU, gl.LINK_STATUS ) === false ) {

			this._logProgramError( programGPU, fragmentShader, vertexShader );

		}

		gl.useProgram( programGPU );

		// Bindings

		const bindings = renderObject.getBindings();

		this._setupBindings( bindings, programGPU );

		//

		this.set( pipeline, {
			programGPU
		} );

	}

	createComputePipeline( computePipeline, bindings ) {

		const gl = this.gl;

		// Program

		const fragmentProgram = {
			stage: 'fragment',
			code: '#version 300 es\nprecision highp float;\nvoid main() {}'
		};

		this.createProgram( fragmentProgram );

		const { computeProgram } = computePipeline;

		const programGPU = gl.createProgram();

		const fragmentShader = this.get( fragmentProgram ).shaderGPU;
		const vertexShader = this.get( computeProgram ).shaderGPU;

		const transforms = computeProgram.transforms;

		const transformVaryingNames = [];
		const transformAttributeNodes = [];

		for ( let i = 0; i < transforms.length; i ++ ) {

			const transform = transforms[ i ];

			transformVaryingNames.push( transform.varyingName );
			transformAttributeNodes.push( transform.attributeNode );

		}

		gl.attachShader( programGPU, fragmentShader );
		gl.attachShader( programGPU, vertexShader );

		gl.transformFeedbackVaryings(
			programGPU,
			transformVaryingNames,
			gl.SEPARATE_ATTRIBS
		);

		gl.linkProgram( programGPU );

		if ( gl.getProgramParameter( programGPU, gl.LINK_STATUS ) === false ) {

			this._logProgramError( programGPU, fragmentShader, vertexShader );


		}

		gl.useProgram( programGPU );

		// Bindings

		this.createBindings( null, bindings );

		this._setupBindings( bindings, programGPU );

		const attributeNodes = computeProgram.attributes;
		const attributes = [];
		const transformBuffers = [];

		for ( let i = 0; i < attributeNodes.length; i ++ ) {

			const attribute = attributeNodes[ i ].node.attribute;

			attributes.push( attribute );

			if ( ! this.has( attribute ) ) this.attributeUtils.createAttribute( attribute, gl.ARRAY_BUFFER );

		}

		for ( let i = 0; i < transformAttributeNodes.length; i ++ ) {

			const attribute = transformAttributeNodes[ i ].attribute;

			if ( ! this.has( attribute ) ) this.attributeUtils.createAttribute( attribute, gl.ARRAY_BUFFER );

			const attributeData = this.get( attribute );

			transformBuffers.push( attributeData );

		}

		//

		this.set( computePipeline, {
			programGPU,
			transformBuffers,
			attributes
		} );

	}

	createBindings( bindGroup, bindings ) {

		this.updateBindings( bindGroup, bindings );

	}

	updateBindings( bindGroup, bindings ) {

		const { gl } = this;

		let groupIndex = 0;
		let textureIndex = 0;

		for ( const bindGroup of bindings ) {

			for ( const binding of bindGroup.bindings ) {

				if ( binding.isUniformsGroup || binding.isUniformBuffer ) {

					const bufferGPU = gl.createBuffer();
					const data = binding.buffer;

					gl.bindBuffer( gl.UNIFORM_BUFFER, bufferGPU );
					gl.bufferData( gl.UNIFORM_BUFFER, data, gl.DYNAMIC_DRAW );
					gl.bindBufferBase( gl.UNIFORM_BUFFER, groupIndex, bufferGPU );

					this.set( binding, {
						index: groupIndex ++,
						bufferGPU
					} );

				} else if ( binding.isSampledTexture ) {

					const { textureGPU, glTextureType } = this.get( binding.texture );

					this.set( binding, {
						index: textureIndex ++,
						textureGPU,
						glTextureType
					} );

				}

			}

		}

	}

	updateBinding( binding ) {

		const gl = this.gl;

		if ( binding.isUniformsGroup || binding.isUniformBuffer ) {

			const bindingData = this.get( binding );
			const bufferGPU = bindingData.bufferGPU;
			const data = binding.buffer;

			gl.bindBuffer( gl.UNIFORM_BUFFER, bufferGPU );
			gl.bufferData( gl.UNIFORM_BUFFER, data, gl.DYNAMIC_DRAW );

		}

	}

	// attributes

	createIndexAttribute( attribute ) {

		const gl = this.gl;

		this.attributeUtils.createAttribute( attribute, gl.ELEMENT_ARRAY_BUFFER );

	}

	createAttribute( attribute ) {

		if ( this.has( attribute ) ) return;

		const gl = this.gl;

		this.attributeUtils.createAttribute( attribute, gl.ARRAY_BUFFER );

	}

	createStorageAttribute( attribute ) {

		if ( this.has( attribute ) ) return;

		const gl = this.gl;

		this.attributeUtils.createAttribute( attribute, gl.ARRAY_BUFFER );

	}

	updateAttribute( attribute ) {

		this.attributeUtils.updateAttribute( attribute );

	}

	destroyAttribute( attribute ) {

		this.attributeUtils.destroyAttribute( attribute );

	}

	updateSize() {

		//console.warn( 'Abstract class.' );

	}

	hasFeature( name ) {

		const keysMatching = Object.keys( GLFeatureName ).filter( key => GLFeatureName[ key ] === name );

		const extensions = this.extensions;

		for ( let i = 0; i < keysMatching.length; i ++ ) {

			if ( extensions.has( keysMatching[ i ] ) ) return true;

		}

		return false;

	}


	getMaxAnisotropy() {

		return this.capabilities.getMaxAnisotropy();

	}

	copyTextureToTexture( position, srcTexture, dstTexture, level ) {

		this.textureUtils.copyTextureToTexture( position, srcTexture, dstTexture, level );

	}

	copyFramebufferToTexture( texture, renderContext ) {

		this.textureUtils.copyFramebufferToTexture( texture, renderContext );

	}

	_setFramebuffer( renderContext ) {

		const { gl, state } = this;

		let currentFrameBuffer = null;

		if ( renderContext.textures !== null ) {

			const renderTarget = renderContext.renderTarget;
			const renderTargetContextData = this.get( renderTarget );
			const { samples, depthBuffer, stencilBuffer } = renderTarget;
			const cubeFace = this.renderer._activeCubeFace;
			const isCube = renderTarget.isWebGLCubeRenderTarget === true;

			let msaaFb = renderTargetContextData.msaaFrameBuffer;
			let depthRenderbuffer = renderTargetContextData.depthRenderbuffer;

			let fb;

			if ( isCube ) {

				if ( renderTargetContextData.cubeFramebuffers === undefined ) {

					renderTargetContextData.cubeFramebuffers = [];

				}

				fb = renderTargetContextData.cubeFramebuffers[ cubeFace ];

			} else {

				fb = renderTargetContextData.framebuffer;

			}

			if ( fb === undefined ) {

				fb = gl.createFramebuffer();

				state.bindFramebuffer( gl.FRAMEBUFFER, fb );

				const textures = renderContext.textures;

				if ( isCube ) {

					renderTargetContextData.cubeFramebuffers[ cubeFace ] = fb;
					const { textureGPU } = this.get( textures[ 0 ] );

					gl.framebufferTexture2D( gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_CUBE_MAP_POSITIVE_X + cubeFace, textureGPU, 0 );

				} else {

					for ( let i = 0; i < textures.length; i ++ ) {

						const texture = textures[ i ];
						const textureData = this.get( texture );
						textureData.renderTarget = renderContext.renderTarget;

						const attachment = gl.COLOR_ATTACHMENT0 + i;

						gl.framebufferTexture2D( gl.FRAMEBUFFER, attachment, gl.TEXTURE_2D, textureData.textureGPU, 0 );

					}

					renderTargetContextData.framebuffer = fb;

					state.drawBuffers( renderContext, fb );

				}

				if ( renderContext.depthTexture !== null ) {

					const textureData = this.get( renderContext.depthTexture );
					const depthStyle = stencilBuffer ? gl.DEPTH_STENCIL_ATTACHMENT : gl.DEPTH_ATTACHMENT;

					gl.framebufferTexture2D( gl.FRAMEBUFFER, depthStyle, gl.TEXTURE_2D, textureData.textureGPU, 0 );

				}

			}

			if ( samples > 0 ) {

				if ( msaaFb === undefined ) {

					const invalidationArray = [];

					msaaFb = gl.createFramebuffer();

					state.bindFramebuffer( gl.FRAMEBUFFER, msaaFb );

					const msaaRenderbuffers = [];

					const textures = renderContext.textures;

					for ( let i = 0; i < textures.length; i ++ ) {


						msaaRenderbuffers[ i ] = gl.createRenderbuffer();

						gl.bindRenderbuffer( gl.RENDERBUFFER, msaaRenderbuffers[ i ] );

						invalidationArray.push( gl.COLOR_ATTACHMENT0 + i );

						if ( depthBuffer ) {

							const depthStyle = stencilBuffer ? gl.DEPTH_STENCIL_ATTACHMENT : gl.DEPTH_ATTACHMENT;
							invalidationArray.push( depthStyle );

						}

						const texture = renderContext.textures[ i ];
						const textureData = this.get( texture );

						gl.renderbufferStorageMultisample( gl.RENDERBUFFER, samples, textureData.glInternalFormat, renderContext.width, renderContext.height );
						gl.framebufferRenderbuffer( gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0 + i, gl.RENDERBUFFER, msaaRenderbuffers[ i ] );


					}

					renderTargetContextData.msaaFrameBuffer = msaaFb;
					renderTargetContextData.msaaRenderbuffers = msaaRenderbuffers;

					if ( depthRenderbuffer === undefined ) {

						depthRenderbuffer = gl.createRenderbuffer();
						this.textureUtils.setupRenderBufferStorage( depthRenderbuffer, renderContext );

						renderTargetContextData.depthRenderbuffer = depthRenderbuffer;

						const depthStyle = stencilBuffer ? gl.DEPTH_STENCIL_ATTACHMENT : gl.DEPTH_ATTACHMENT;
						invalidationArray.push( depthStyle );

					}

					renderTargetContextData.invalidationArray = invalidationArray;

				}

				currentFrameBuffer = renderTargetContextData.msaaFrameBuffer;

			} else {

				currentFrameBuffer = fb;

			}

		}

		state.bindFramebuffer( gl.FRAMEBUFFER, currentFrameBuffer );

	}


	_getVaoKey( index, attributes ) {

		let key = [];

		if ( index !== null ) {

			const indexData = this.get( index );

			key += ':' + indexData.id;

		}

		for ( let i = 0; i < attributes.length; i ++ ) {

			const attributeData = this.get( attributes[ i ] );

			key += ':' + attributeData.id;

		}

		return key;

	}

	_createVao( index, attributes ) {

		const { gl } = this;

		const vaoGPU = gl.createVertexArray();
		let key = '';

		let staticVao = true;

		gl.bindVertexArray( vaoGPU );

		if ( index !== null ) {

			const indexData = this.get( index );

			gl.bindBuffer( gl.ELEMENT_ARRAY_BUFFER, indexData.bufferGPU );

			key += ':' + indexData.id;

		}

		for ( let i = 0; i < attributes.length; i ++ ) {

			const attribute = attributes[ i ];
			const attributeData = this.get( attribute );

			key += ':' + attributeData.id;

			gl.bindBuffer( gl.ARRAY_BUFFER, attributeData.bufferGPU );
			gl.enableVertexAttribArray( i );

			if ( attribute.isStorageBufferAttribute || attribute.isStorageInstancedBufferAttribute ) staticVao = false;

			let stride, offset;

			if ( attribute.isInterleavedBufferAttribute === true ) {

				stride = attribute.data.stride * attributeData.bytesPerElement;
				offset = attribute.offset * attributeData.bytesPerElement;

			} else {

				stride = 0;
				offset = 0;

			}

			if ( attributeData.isInteger ) {

				gl.vertexAttribIPointer( i, attribute.itemSize, attributeData.type, stride, offset );

			} else {

				gl.vertexAttribPointer( i, attribute.itemSize, attributeData.type, attribute.normalized, stride, offset );

			}

			if ( attribute.isInstancedBufferAttribute && ! attribute.isInterleavedBufferAttribute ) {

				gl.vertexAttribDivisor( i, attribute.meshPerAttribute );

			} else if ( attribute.isInterleavedBufferAttribute && attribute.data.isInstancedInterleavedBuffer ) {

				gl.vertexAttribDivisor( i, attribute.data.meshPerAttribute );

			}

		}

		gl.bindBuffer( gl.ARRAY_BUFFER, null );

		this.vaoCache[ key ] = vaoGPU;

		return { vaoGPU, staticVao };

	}

	_getTransformFeedback( transformBuffers ) {

		let key = '';

		for ( let i = 0; i < transformBuffers.length; i ++ ) {

			key += ':' + transformBuffers[ i ].id;

		}

		let transformFeedbackGPU = this.transformFeedbackCache[ key ];

		if ( transformFeedbackGPU !== undefined ) {

			return transformFeedbackGPU;

		}

		const gl = this.gl;

		transformFeedbackGPU = gl.createTransformFeedback();

		gl.bindTransformFeedback( gl.TRANSFORM_FEEDBACK, transformFeedbackGPU );

		for ( let i = 0; i < transformBuffers.length; i ++ ) {

			const attributeData = transformBuffers[ i ];

			gl.bindBufferBase( gl.TRANSFORM_FEEDBACK_BUFFER, i, attributeData.transformBuffer );

		}

		gl.bindTransformFeedback( gl.TRANSFORM_FEEDBACK, null );

		this.transformFeedbackCache[ key ] = transformFeedbackGPU;

		return transformFeedbackGPU;

	}


	_setupBindings( bindings, programGPU ) {

		const gl = this.gl;

		for ( const bindGroup of bindings ) {

			for ( const binding of bindGroup.bindings ) {

				const bindingData = this.get( binding );
				const index = bindingData.index;

				if ( binding.isUniformsGroup || binding.isUniformBuffer ) {

					const location = gl.getUniformBlockIndex( programGPU, binding.name );
					gl.uniformBlockBinding( programGPU, location, index );

				} else if ( binding.isSampledTexture ) {

					const location = gl.getUniformLocation( programGPU, binding.name );
					gl.uniform1i( location, index );

				}

			}

		}

	}

	_bindUniforms( bindings ) {

		const { gl, state } = this;

		for ( const bindGroup of bindings ) {

			for ( const binding of bindGroup.bindings ) {

				const bindingData = this.get( binding );
				const index = bindingData.index;

				if ( binding.isUniformsGroup || binding.isUniformBuffer ) {

					gl.bindBufferBase( gl.UNIFORM_BUFFER, index, bindingData.bufferGPU );

				} else if ( binding.isSampledTexture ) {

					state.bindTexture( bindingData.glTextureType, bindingData.textureGPU, gl.TEXTURE0 + index );

				}

			}

		}

	}

}

class Sampler extends Binding {

	constructor( name, texture ) {

		super( name );

		this.texture = texture;
		this.version = texture ? texture.version : 0;

		this.isSampler = true;

	}

}

class NodeSampler extends Sampler {

	constructor( name, textureNode, groupNode ) {

		super( name, textureNode ? textureNode.value : null );

		this.textureNode = textureNode;
		this.groupNode = groupNode;

	}

	update() {

		this.texture = this.textureNode.value;

	}

}

class StorageBuffer extends Buffer {

	constructor( name, attribute ) {

		super( name, attribute ? attribute.array : null );

		this.attribute = attribute;

		this.isStorageBuffer = true;

	}

}

let _id = 0;

class NodeStorageBuffer extends StorageBuffer {

	constructor( nodeUniform, groupNode ) {

		super( 'StorageBuffer_' + _id ++, nodeUniform ? nodeUniform.value : null );

		this.nodeUniform = nodeUniform;
		this.access = nodeUniform ? nodeUniform.access : GPUBufferBindingType.Storage;
		this.groupNode = groupNode;


	}

	get buffer() {

		return this.nodeUniform.value;

	}

}

class WebGPUTexturePassUtils {

	constructor( device ) {

		this.device = device;

		const mipmapVertexSource = `
struct VarysStruct {
	@builtin( position ) Position: vec4<f32>,
	@location( 0 ) vTex : vec2<f32>
};

@vertex
fn main( @builtin( vertex_index ) vertexIndex : u32 ) -> VarysStruct {

	var Varys : VarysStruct;

	var pos = array< vec2<f32>, 4 >(
		vec2<f32>( -1.0,  1.0 ),
		vec2<f32>(  1.0,  1.0 ),
		vec2<f32>( -1.0, -1.0 ),
		vec2<f32>(  1.0, -1.0 )
	);

	var tex = array< vec2<f32>, 4 >(
		vec2<f32>( 0.0, 0.0 ),
		vec2<f32>( 1.0, 0.0 ),
		vec2<f32>( 0.0, 1.0 ),
		vec2<f32>( 1.0, 1.0 )
	);

	Varys.vTex = tex[ vertexIndex ];
	Varys.Position = vec4<f32>( pos[ vertexIndex ], 0.0, 1.0 );

	return Varys;

}
`;

		const mipmapFragmentSource = `
@group( 0 ) @binding( 0 )
var imgSampler : sampler;

@group( 0 ) @binding( 1 )
var img : texture_2d<f32>;

@fragment
fn main( @location( 0 ) vTex : vec2<f32> ) -> @location( 0 ) vec4<f32> {

	return textureSample( img, imgSampler, vTex );

}
`;

		const flipYFragmentSource = `
@group( 0 ) @binding( 0 )
var imgSampler : sampler;

@group( 0 ) @binding( 1 )
var img : texture_2d<f32>;

@fragment
fn main( @location( 0 ) vTex : vec2<f32> ) -> @location( 0 ) vec4<f32> {

	return textureSample( img, imgSampler, vec2( vTex.x, 1.0 - vTex.y ) );

}
`;
		this.mipmapSampler = device.createSampler( { minFilter: GPUFilterMode.Linear } );
		this.flipYSampler = device.createSampler( { minFilter: GPUFilterMode.Nearest } ); //@TODO?: Consider using textureLoad()

		// We'll need a new pipeline for every texture format used.
		this.transferPipelines = {};
		this.flipYPipelines = {};

		this.mipmapVertexShaderModule = device.createShaderModule( {
			label: 'mipmapVertex',
			code: mipmapVertexSource
		} );

		this.mipmapFragmentShaderModule = device.createShaderModule( {
			label: 'mipmapFragment',
			code: mipmapFragmentSource
		} );

		this.flipYFragmentShaderModule = device.createShaderModule( {
			label: 'flipYFragment',
			code: flipYFragmentSource
		} );

	}

	getTransferPipeline( format ) {

		let pipeline = this.transferPipelines[ format ];

		if ( pipeline === undefined ) {

			pipeline = this.device.createRenderPipeline( {
				vertex: {
					module: this.mipmapVertexShaderModule,
					entryPoint: 'main'
				},
				fragment: {
					module: this.mipmapFragmentShaderModule,
					entryPoint: 'main',
					targets: [ { format } ]
				},
				primitive: {
					topology: GPUPrimitiveTopology.TriangleStrip,
					stripIndexFormat: GPUIndexFormat.Uint32
				},
				layout: 'auto'
			} );

			this.transferPipelines[ format ] = pipeline;

		}

		return pipeline;

	}

	getFlipYPipeline( format ) {

		let pipeline = this.flipYPipelines[ format ];

		if ( pipeline === undefined ) {

			pipeline = this.device.createRenderPipeline( {
				vertex: {
					module: this.mipmapVertexShaderModule,
					entryPoint: 'main'
				},
				fragment: {
					module: this.flipYFragmentShaderModule,
					entryPoint: 'main',
					targets: [ { format } ]
				},
				primitive: {
					topology: GPUPrimitiveTopology.TriangleStrip,
					stripIndexFormat: GPUIndexFormat.Uint32
				},
				layout: 'auto'
			} );

			this.flipYPipelines[ format ] = pipeline;

		}

		return pipeline;

	}

	flipY( textureGPU, textureGPUDescriptor, baseArrayLayer = 0 ) {

		const format = textureGPUDescriptor.format;
		const { width, height } = textureGPUDescriptor.size;

		const transferPipeline = this.getTransferPipeline( format );
		const flipYPipeline = this.getFlipYPipeline( format );

		const tempTexture = this.device.createTexture( {
			size: { width, height, depthOrArrayLayers: 1 },
			format,
			usage: GPUTextureUsage.RENDER_ATTACHMENT | GPUTextureUsage.TEXTURE_BINDING
		} );

		const srcView = textureGPU.createView( {
			baseMipLevel: 0,
			mipLevelCount: 1,
			dimension: GPUTextureViewDimension.TwoD,
			baseArrayLayer
		} );

		const dstView = tempTexture.createView( {
			baseMipLevel: 0,
			mipLevelCount: 1,
			dimension: GPUTextureViewDimension.TwoD,
			baseArrayLayer: 0
		} );

		const commandEncoder = this.device.createCommandEncoder( {} );

		const pass = ( pipeline, sourceView, destinationView ) => {

			const bindGroupLayout = pipeline.getBindGroupLayout( 0 ); // @TODO: Consider making this static.

			const bindGroup = this.device.createBindGroup( {
				layout: bindGroupLayout,
				entries: [ {
					binding: 0,
					resource: this.flipYSampler
				}, {
					binding: 1,
					resource: sourceView
				} ]
			} );

			const passEncoder = commandEncoder.beginRenderPass( {
				colorAttachments: [ {
					view: destinationView,
					loadOp: GPULoadOp.Clear,
					storeOp: GPUStoreOp.Store,
					clearValue: [ 0, 0, 0, 0 ]
				} ]
			} );

			passEncoder.setPipeline( pipeline );
			passEncoder.setBindGroup( 0, bindGroup );
			passEncoder.draw( 4, 1, 0, 0 );
			passEncoder.end();

		};

		pass( transferPipeline, srcView, dstView );
		pass( flipYPipeline, dstView, srcView );

		this.device.queue.submit( [ commandEncoder.finish() ] );

		tempTexture.destroy();

	}

	generateMipmaps( textureGPU, textureGPUDescriptor, baseArrayLayer = 0 ) {

		const pipeline = this.getTransferPipeline( textureGPUDescriptor.format );

		const commandEncoder = this.device.createCommandEncoder( {} );
		const bindGroupLayout = pipeline.getBindGroupLayout( 0 ); // @TODO: Consider making this static.

		let srcView = textureGPU.createView( {
			baseMipLevel: 0,
			mipLevelCount: 1,
			dimension: GPUTextureViewDimension.TwoD,
			baseArrayLayer
		} );

		for ( let i = 1; i < textureGPUDescriptor.mipLevelCount; i ++ ) {

			const bindGroup = this.device.createBindGroup( {
				layout: bindGroupLayout,
				entries: [ {
					binding: 0,
					resource: this.mipmapSampler
				}, {
					binding: 1,
					resource: srcView
				} ]
			} );

			const dstView = textureGPU.createView( {
				baseMipLevel: i,
				mipLevelCount: 1,
				dimension: GPUTextureViewDimension.TwoD,
				baseArrayLayer
			} );

			const passEncoder = commandEncoder.beginRenderPass( {
				colorAttachments: [ {
					view: dstView,
					loadOp: GPULoadOp.Clear,
					storeOp: GPUStoreOp.Store,
					clearValue: [ 0, 0, 0, 0 ]
				} ]
			} );

			passEncoder.setPipeline( pipeline );
			passEncoder.setBindGroup( 0, bindGroup );
			passEncoder.draw( 4, 1, 0, 0 );
			passEncoder.end();

			srcView = dstView;

		}

		this.device.queue.submit( [ commandEncoder.finish() ] );

	}

}

const _compareToWebGPU = {
	[ NeverCompare ]: 'never',
	[ LessCompare ]: 'less',
	[ EqualCompare ]: 'equal',
	[ LessEqualCompare ]: 'less-equal',
	[ GreaterCompare ]: 'greater',
	[ GreaterEqualCompare ]: 'greater-equal',
	[ AlwaysCompare ]: 'always',
	[ NotEqualCompare ]: 'not-equal'
};

const _flipMap = [ 0, 1, 3, 2, 4, 5 ];

class WebGPUTextureUtils {

	constructor( backend ) {

		this.backend = backend;

		this._passUtils = null;

		this.defaultTexture = {};
		this.defaultCubeTexture = {};

		this.colorBuffer = null;

		this.depthTexture = new DepthTexture();
		this.depthTexture.name = 'depthBuffer';

	}

	createSampler( texture ) {

		const backend = this.backend;
		const device = backend.device;

		const textureGPU = backend.get( texture );

		const samplerDescriptorGPU = {
			addressModeU: this._convertAddressMode( texture.wrapS ),
			addressModeV: this._convertAddressMode( texture.wrapT ),
			addressModeW: this._convertAddressMode( texture.wrapR ),
			magFilter: this._convertFilterMode( texture.magFilter ),
			minFilter: this._convertFilterMode( texture.minFilter ),
			mipmapFilter: this._convertFilterMode( texture.minFilter ),
			maxAnisotropy: texture.anisotropy
		};

		if ( texture.isDepthTexture && texture.compareFunction !== null ) {

			samplerDescriptorGPU.compare = _compareToWebGPU[ texture.compareFunction ];

		}

		textureGPU.sampler = device.createSampler( samplerDescriptorGPU );

	}

	createDefaultTexture( texture ) {

		let textureGPU;

		const format = getFormat( texture );

		if ( texture.isCubeTexture ) {

			textureGPU = this._getDefaultCubeTextureGPU( format );

		} else {

			textureGPU = this._getDefaultTextureGPU( format );

		}

		this.backend.get( texture ).texture = textureGPU;

	}

	createTexture( texture, options = {} ) {

		const backend = this.backend;
		const textureData = backend.get( texture );

		if ( textureData.initialized ) {

			throw new Error( 'WebGPUTextureUtils: Texture already initialized.' );

		}

		if ( options.needsMipmaps === undefined ) options.needsMipmaps = false;
		if ( options.levels === undefined ) options.levels = 1;
		if ( options.depth === undefined ) options.depth = 1;

		const { width, height, depth, levels } = options;

		const dimension = this._getDimension( texture );
		const format = texture.internalFormat || options.format || getFormat( texture, backend.device );

		let sampleCount = options.sampleCount !== undefined ? options.sampleCount : 1;

		sampleCount = backend.utils.getSampleCount( sampleCount );

		const primarySampleCount = texture.isRenderTargetTexture && ! texture.isMultisampleRenderTargetTexture ? 1 : sampleCount;

		let usage = GPUTextureUsage.TEXTURE_BINDING | GPUTextureUsage.COPY_DST | GPUTextureUsage.COPY_SRC;

		if ( texture.isStorageTexture === true ) {

			usage |= GPUTextureUsage.STORAGE_BINDING;

		}

		if ( texture.isCompressedTexture !== true ) {

			usage |= GPUTextureUsage.RENDER_ATTACHMENT;

		}

		const textureDescriptorGPU = {
			label: texture.name,
			size: {
				width: width,
				height: height,
				depthOrArrayLayers: depth,
			},
			mipLevelCount: levels,
			sampleCount: primarySampleCount,
			dimension: dimension,
			format: format,
			usage: usage
		};

		// texture creation

		if ( texture.isVideoTexture ) {

			const video = texture.source.data;
			const videoFrame = new VideoFrame( video );

			textureDescriptorGPU.size.width = videoFrame.displayWidth;
			textureDescriptorGPU.size.height = videoFrame.displayHeight;

			videoFrame.close();

			textureData.externalTexture = video;

		} else {

			if ( format === undefined ) {

				console.warn( 'WebGPURenderer: Texture format not supported.' );

				return this.createDefaultTexture( texture );

			}

			textureData.texture = backend.device.createTexture( textureDescriptorGPU );

		}

		if ( texture.isRenderTargetTexture && sampleCount > 1 && ! texture.isMultisampleRenderTargetTexture ) {

			const msaaTextureDescriptorGPU = Object.assign( {}, textureDescriptorGPU );

			msaaTextureDescriptorGPU.label = msaaTextureDescriptorGPU.label + '-msaa';
			msaaTextureDescriptorGPU.sampleCount = sampleCount;

			textureData.msaaTexture = backend.device.createTexture( msaaTextureDescriptorGPU );

		}

		textureData.initialized = true;

		textureData.textureDescriptorGPU = textureDescriptorGPU;

	}

	destroyTexture( texture ) {

		const backend = this.backend;
		const textureData = backend.get( texture );

		textureData.texture.destroy();

		if ( textureData.msaaTexture !== undefined ) textureData.msaaTexture.destroy();

		backend.delete( texture );

	}

	destroySampler( texture ) {

		const backend = this.backend;
		const textureData = backend.get( texture );

		delete textureData.sampler;

	}

	generateMipmaps( texture ) {

		const textureData = this.backend.get( texture );

		if ( texture.isCubeTexture ) {

			for ( let i = 0; i < 6; i ++ ) {

				this._generateMipmaps( textureData.texture, textureData.textureDescriptorGPU, i );

			}

		} else {

			this._generateMipmaps( textureData.texture, textureData.textureDescriptorGPU );

		}

	}

	getColorBuffer() {

		if ( this.colorBuffer ) this.colorBuffer.destroy();

		const backend = this.backend;
		const { width, height } = backend.getDrawingBufferSize();

		this.colorBuffer = backend.device.createTexture( {
			label: 'colorBuffer',
			size: {
				width: width,
				height: height,
				depthOrArrayLayers: 1
			},
			sampleCount: backend.utils.getSampleCount( backend.renderer.samples ),
			format: GPUTextureFormat.BGRA8Unorm,
			usage: GPUTextureUsage.RENDER_ATTACHMENT | GPUTextureUsage.COPY_SRC
		} );

		return this.colorBuffer;

	}

	getDepthBuffer( depth = true, stencil = false ) {

		const backend = this.backend;
		const { width, height } = backend.getDrawingBufferSize();

		const depthTexture = this.depthTexture;
		const depthTextureGPU = backend.get( depthTexture ).texture;

		let format, type;

		if ( stencil ) {

			format = DepthStencilFormat;
			type = UnsignedInt248Type;

		} else if ( depth ) {

			format = DepthFormat;
			type = UnsignedIntType;

		}

		if ( depthTextureGPU !== undefined ) {

			if ( depthTexture.image.width === width && depthTexture.image.height === height && depthTexture.format === format && depthTexture.type === type ) {

				return depthTextureGPU;

			}

			this.destroyTexture( depthTexture );

		}

		depthTexture.name = 'depthBuffer';
		depthTexture.format = format;
		depthTexture.type = type;
		depthTexture.image.width = width;
		depthTexture.image.height = height;

		this.createTexture( depthTexture, { sampleCount: backend.utils.getSampleCount( backend.renderer.samples ), width, height } );

		return backend.get( depthTexture ).texture;

	}

	updateTexture( texture, options ) {

		const textureData = this.backend.get( texture );

		const { textureDescriptorGPU } = textureData;

		if ( texture.isRenderTargetTexture || ( textureDescriptorGPU === undefined /* unsupported texture format */ ) )
			return;

		// transfer texture data

		if ( texture.isDataTexture ) {

			this._copyBufferToTexture( options.image, textureData.texture, textureDescriptorGPU, 0, texture.flipY );

		} else if ( texture.isDataArrayTexture || texture.isData3DTexture ) {

			for ( let i = 0; i < options.image.depth; i ++ ) {

				this._copyBufferToTexture( options.image, textureData.texture, textureDescriptorGPU, i, texture.flipY, i );

			}

		} else if ( texture.isCompressedTexture ) {

			this._copyCompressedBufferToTexture( texture.mipmaps, textureData.texture, textureDescriptorGPU );

		} else if ( texture.isCubeTexture ) {

			this._copyCubeMapToTexture( options.images, textureData.texture, textureDescriptorGPU, texture.flipY );

		} else if ( texture.isVideoTexture ) {

			const video = texture.source.data;

			textureData.externalTexture = video;

		} else {

			this._copyImageToTexture( options.image, textureData.texture, textureDescriptorGPU, 0, texture.flipY );

		}

		//

		textureData.version = texture.version;

		if ( texture.onUpdate ) texture.onUpdate( texture );

	}

	async copyTextureToBuffer( texture, x, y, width, height ) {

		const device = this.backend.device;

		const textureData = this.backend.get( texture );
		const textureGPU = textureData.texture;
		const format = textureData.textureDescriptorGPU.format;
		const bytesPerTexel = this._getBytesPerTexel( format );

		let bytesPerRow = width * bytesPerTexel;
		bytesPerRow = Math.ceil( bytesPerRow / 256 ) * 256; // Align to 256 bytes

		const readBuffer = device.createBuffer(
			{
				size: width * height * bytesPerTexel,
				usage: GPUBufferUsage.COPY_DST | GPUBufferUsage.MAP_READ
			}
		);

		const encoder = device.createCommandEncoder();

		encoder.copyTextureToBuffer(
			{
				texture: textureGPU,
				origin: { x, y },
			},
			{
				buffer: readBuffer,
				bytesPerRow: bytesPerRow
			},
			{
				width: width,
				height: height
			}

		);

		const typedArrayType = this._getTypedArrayType( format );

		device.queue.submit( [ encoder.finish() ] );

		await readBuffer.mapAsync( GPUMapMode.READ );

		const buffer = readBuffer.getMappedRange();

		return new typedArrayType( buffer );

	}

	_isEnvironmentTexture( texture ) {

		const mapping = texture.mapping;

		return ( mapping === EquirectangularReflectionMapping || mapping === EquirectangularRefractionMapping ) || ( mapping === CubeReflectionMapping || mapping === CubeRefractionMapping );

	}

	_getDefaultTextureGPU( format ) {

		let defaultTexture = this.defaultTexture[ format ];

		if ( defaultTexture === undefined ) {

			const texture = new Texture();
			texture.minFilter = NearestFilter;
			texture.magFilter = NearestFilter;

			this.createTexture( texture, { width: 1, height: 1, format } );

			this.defaultTexture[ format ] = defaultTexture = texture;

		}

		return this.backend.get( defaultTexture ).texture;

	}

	_getDefaultCubeTextureGPU( format ) {

		let defaultCubeTexture = this.defaultTexture[ format ];

		if ( defaultCubeTexture === undefined ) {

			const texture = new CubeTexture();
			texture.minFilter = NearestFilter;
			texture.magFilter = NearestFilter;

			this.createTexture( texture, { width: 1, height: 1, depth: 6 } );

			this.defaultCubeTexture[ format ] = defaultCubeTexture = texture;

		}

		return this.backend.get( defaultCubeTexture ).texture;

	}

	_copyCubeMapToTexture( images, textureGPU, textureDescriptorGPU, flipY ) {

		for ( let i = 0; i < 6; i ++ ) {

			const image = images[ i ];

			const flipIndex = flipY === true ? _flipMap[ i ] : i;

			if ( image.isDataTexture ) {

				this._copyBufferToTexture( image.image, textureGPU, textureDescriptorGPU, flipIndex, flipY );

			} else {

				this._copyImageToTexture( image, textureGPU, textureDescriptorGPU, flipIndex, flipY );

			}

		}

	}

	_copyImageToTexture( image, textureGPU, textureDescriptorGPU, originDepth, flipY ) {

		const device = this.backend.device;

		device.queue.copyExternalImageToTexture(
			{
				source: image
			}, {
				texture: textureGPU,
				mipLevel: 0,
				origin: { x: 0, y: 0, z: originDepth }
			}, {
				width: image.width,
				height: image.height,
				depthOrArrayLayers: 1
			}
		);

		if ( flipY === true ) {

			this._flipY( textureGPU, textureDescriptorGPU, originDepth );

		}

	}

	_getPassUtils() {

		let passUtils = this._passUtils;

		if ( passUtils === null ) {

			this._passUtils = passUtils = new WebGPUTexturePassUtils( this.backend.device );

		}

		return passUtils;

	}

	_generateMipmaps( textureGPU, textureDescriptorGPU, baseArrayLayer = 0 ) {

		this._getPassUtils().generateMipmaps( textureGPU, textureDescriptorGPU, baseArrayLayer );

	}

	_flipY( textureGPU, textureDescriptorGPU, originDepth = 0 ) {

		this._getPassUtils().flipY( textureGPU, textureDescriptorGPU, originDepth );

	}

	_copyBufferToTexture( image, textureGPU, textureDescriptorGPU, originDepth, flipY, depth = 0 ) {

		// @TODO: Consider to use GPUCommandEncoder.copyBufferToTexture()
		// @TODO: Consider to support valid buffer layouts with other formats like RGB

		const device = this.backend.device;

		const data = image.data;

		const bytesPerTexel = this._getBytesPerTexel( textureDescriptorGPU.format );
		const bytesPerRow = image.width * bytesPerTexel;

		device.queue.writeTexture(
			{
				texture: textureGPU,
				mipLevel: 0,
				origin: { x: 0, y: 0, z: originDepth }
			},
			data,
			{
				offset: image.width * image.height * bytesPerTexel * depth,
				bytesPerRow
			},
			{
				width: image.width,
				height: image.height,
				depthOrArrayLayers: 1
			} );

		if ( flipY === true ) {

			this._flipY( textureGPU, textureDescriptorGPU, originDepth );

		}

	}

	_copyCompressedBufferToTexture( mipmaps, textureGPU, textureDescriptorGPU ) {

		// @TODO: Consider to use GPUCommandEncoder.copyBufferToTexture()

		const device = this.backend.device;

		const blockData = this._getBlockData( textureDescriptorGPU.format );

		for ( let i = 0; i < mipmaps.length; i ++ ) {

			const mipmap = mipmaps[ i ];

			const width = mipmap.width;
			const height = mipmap.height;

			const bytesPerRow = Math.ceil( width / blockData.width ) * blockData.byteLength;

			device.queue.writeTexture(
				{
					texture: textureGPU,
					mipLevel: i
				},
				mipmap.data,
				{
					offset: 0,
					bytesPerRow
				},
				{
					width: Math.ceil( width / blockData.width ) * blockData.width,
					height: Math.ceil( height / blockData.width ) * blockData.width,
					depthOrArrayLayers: 1
				}
			);

		}

	}

	_getBlockData( format ) {

		// this method is only relevant for compressed texture formats

		if ( format === GPUTextureFormat.BC1RGBAUnorm || format === GPUTextureFormat.BC1RGBAUnormSRGB ) return { byteLength: 8, width: 4, height: 4 }; // DXT1
		if ( format === GPUTextureFormat.BC2RGBAUnorm || format === GPUTextureFormat.BC2RGBAUnormSRGB ) return { byteLength: 16, width: 4, height: 4 }; // DXT3
		if ( format === GPUTextureFormat.BC3RGBAUnorm || format === GPUTextureFormat.BC3RGBAUnormSRGB ) return { byteLength: 16, width: 4, height: 4 }; // DXT5
		if ( format === GPUTextureFormat.BC4RUnorm || format === GPUTextureFormat.BC4RSNorm ) return { byteLength: 8, width: 4, height: 4 }; // RGTC1
		if ( format === GPUTextureFormat.BC5RGUnorm || format === GPUTextureFormat.BC5RGSnorm ) return { byteLength: 16, width: 4, height: 4 }; // RGTC2
		if ( format === GPUTextureFormat.BC6HRGBUFloat || format === GPUTextureFormat.BC6HRGBFloat ) return { byteLength: 16, width: 4, height: 4 }; // BPTC (float)
		if ( format === GPUTextureFormat.BC7RGBAUnorm || format === GPUTextureFormat.BC7RGBAUnormSRGB ) return { byteLength: 16, width: 4, height: 4 }; // BPTC (unorm)

		if ( format === GPUTextureFormat.ETC2RGB8Unorm || format === GPUTextureFormat.ETC2RGB8UnormSRGB ) return { byteLength: 8, width: 4, height: 4 };
		if ( format === GPUTextureFormat.ETC2RGB8A1Unorm || format === GPUTextureFormat.ETC2RGB8A1UnormSRGB ) return { byteLength: 8, width: 4, height: 4 };
		if ( format === GPUTextureFormat.ETC2RGBA8Unorm || format === GPUTextureFormat.ETC2RGBA8UnormSRGB ) return { byteLength: 16, width: 4, height: 4 };
		if ( format === GPUTextureFormat.EACR11Unorm ) return { byteLength: 8, width: 4, height: 4 };
		if ( format === GPUTextureFormat.EACR11Snorm ) return { byteLength: 8, width: 4, height: 4 };
		if ( format === GPUTextureFormat.EACRG11Unorm ) return { byteLength: 16, width: 4, height: 4 };
		if ( format === GPUTextureFormat.EACRG11Snorm ) return { byteLength: 16, width: 4, height: 4 };

		if ( format === GPUTextureFormat.ASTC4x4Unorm || format === GPUTextureFormat.ASTC4x4UnormSRGB ) return { byteLength: 16, width: 4, height: 4 };
		if ( format === GPUTextureFormat.ASTC5x4Unorm || format === GPUTextureFormat.ASTC5x4UnormSRGB ) return { byteLength: 16, width: 5, height: 4 };
		if ( format === GPUTextureFormat.ASTC5x5Unorm || format === GPUTextureFormat.ASTC5x5UnormSRGB ) return { byteLength: 16, width: 5, height: 5 };
		if ( format === GPUTextureFormat.ASTC6x5Unorm || format === GPUTextureFormat.ASTC6x5UnormSRGB ) return { byteLength: 16, width: 6, height: 5 };
		if ( format === GPUTextureFormat.ASTC6x6Unorm || format === GPUTextureFormat.ASTC6x6UnormSRGB ) return { byteLength: 16, width: 6, height: 6 };
		if ( format === GPUTextureFormat.ASTC8x5Unorm || format === GPUTextureFormat.ASTC8x5UnormSRGB ) return { byteLength: 16, width: 8, height: 5 };
		if ( format === GPUTextureFormat.ASTC8x6Unorm || format === GPUTextureFormat.ASTC8x6UnormSRGB ) return { byteLength: 16, width: 8, height: 6 };
		if ( format === GPUTextureFormat.ASTC8x8Unorm || format === GPUTextureFormat.ASTC8x8UnormSRGB ) return { byteLength: 16, width: 8, height: 8 };
		if ( format === GPUTextureFormat.ASTC10x5Unorm || format === GPUTextureFormat.ASTC10x5UnormSRGB ) return { byteLength: 16, width: 10, height: 5 };
		if ( format === GPUTextureFormat.ASTC10x6Unorm || format === GPUTextureFormat.ASTC10x6UnormSRGB ) return { byteLength: 16, width: 10, height: 6 };
		if ( format === GPUTextureFormat.ASTC10x8Unorm || format === GPUTextureFormat.ASTC10x8UnormSRGB ) return { byteLength: 16, width: 10, height: 8 };
		if ( format === GPUTextureFormat.ASTC10x10Unorm || format === GPUTextureFormat.ASTC10x10UnormSRGB ) return { byteLength: 16, width: 10, height: 10 };
		if ( format === GPUTextureFormat.ASTC12x10Unorm || format === GPUTextureFormat.ASTC12x10UnormSRGB ) return { byteLength: 16, width: 12, height: 10 };
		if ( format === GPUTextureFormat.ASTC12x12Unorm || format === GPUTextureFormat.ASTC12x12UnormSRGB ) return { byteLength: 16, width: 12, height: 12 };

	}

	_convertAddressMode( value ) {

		let addressMode = GPUAddressMode.ClampToEdge;

		if ( value === RepeatWrapping ) {

			addressMode = GPUAddressMode.Repeat;

		} else if ( value === MirroredRepeatWrapping ) {

			addressMode = GPUAddressMode.MirrorRepeat;

		}

		return addressMode;

	}

	_convertFilterMode( value ) {

		let filterMode = GPUFilterMode.Linear;

		if ( value === NearestFilter || value === NearestMipmapNearestFilter || value === NearestMipmapLinearFilter ) {

			filterMode = GPUFilterMode.Nearest;

		}

		return filterMode;

	}

	_getBytesPerTexel( format ) {

		// 8-bit formats
		if ( format === GPUTextureFormat.R8Unorm ||
			format === GPUTextureFormat.R8Snorm ||
			format === GPUTextureFormat.R8Uint ||
			format === GPUTextureFormat.R8Sint ) return 1;

		// 16-bit formats
		if ( format === GPUTextureFormat.R16Uint ||
			format === GPUTextureFormat.R16Sint ||
			format === GPUTextureFormat.R16Float ||
			format === GPUTextureFormat.RG8Unorm ||
			format === GPUTextureFormat.RG8Snorm ||
			format === GPUTextureFormat.RG8Uint ||
			format === GPUTextureFormat.RG8Sint ) return 2;

		// 32-bit formats
		if ( format === GPUTextureFormat.R32Uint ||
			format === GPUTextureFormat.R32Sint ||
			format === GPUTextureFormat.R32Float ||
			format === GPUTextureFormat.RG16Uint ||
			format === GPUTextureFormat.RG16Sint ||
			format === GPUTextureFormat.RG16Float ||
			format === GPUTextureFormat.RGBA8Unorm ||
			format === GPUTextureFormat.RGBA8UnormSRGB ||
			format === GPUTextureFormat.RGBA8Snorm ||
			format === GPUTextureFormat.RGBA8Uint ||
			format === GPUTextureFormat.RGBA8Sint ||
			format === GPUTextureFormat.BGRA8Unorm ||
			format === GPUTextureFormat.BGRA8UnormSRGB ||
			// Packed 32-bit formats
			format === GPUTextureFormat.RGB9E5UFloat ||
			format === GPUTextureFormat.RGB10A2Unorm ||
			format === GPUTextureFormat.RG11B10UFloat ||
			format === GPUTextureFormat.Depth32Float ||
			format === GPUTextureFormat.Depth24Plus ||
			format === GPUTextureFormat.Depth24PlusStencil8 ||
			format === GPUTextureFormat.Depth32FloatStencil8 ) return 4;

		// 64-bit formats
		if ( format === GPUTextureFormat.RG32Uint ||
			format === GPUTextureFormat.RG32Sint ||
			format === GPUTextureFormat.RG32Float ||
			format === GPUTextureFormat.RGBA16Uint ||
			format === GPUTextureFormat.RGBA16Sint ||
			format === GPUTextureFormat.RGBA16Float ) return 8;

		// 128-bit formats
		if ( format === GPUTextureFormat.RGBA32Uint ||
			format === GPUTextureFormat.RGBA32Sint ||
			format === GPUTextureFormat.RGBA32Float ) return 16;


	}

	_getTypedArrayType( format ) {

		if ( format === GPUTextureFormat.R8Uint ) return Uint8Array;
		if ( format === GPUTextureFormat.R8Sint ) return Int8Array;
		if ( format === GPUTextureFormat.R8Unorm ) return Uint8Array;
		if ( format === GPUTextureFormat.R8Snorm ) return Int8Array;
		if ( format === GPUTextureFormat.RG8Uint ) return Uint8Array;
		if ( format === GPUTextureFormat.RG8Sint ) return Int8Array;
		if ( format === GPUTextureFormat.RG8Unorm ) return Uint8Array;
		if ( format === GPUTextureFormat.RG8Snorm ) return Int8Array;
		if ( format === GPUTextureFormat.RGBA8Uint ) return Uint8Array;
		if ( format === GPUTextureFormat.RGBA8Sint ) return Int8Array;
		if ( format === GPUTextureFormat.RGBA8Unorm ) return Uint8Array;
		if ( format === GPUTextureFormat.RGBA8Snorm ) return Int8Array;


		if ( format === GPUTextureFormat.R16Uint ) return Uint16Array;
		if ( format === GPUTextureFormat.R16Sint ) return Int16Array;
		if ( format === GPUTextureFormat.RG16Uint ) return Uint16Array;
		if ( format === GPUTextureFormat.RG16Sint ) return Int16Array;
		if ( format === GPUTextureFormat.RGBA16Uint ) return Uint16Array;
		if ( format === GPUTextureFormat.RGBA16Sint ) return Int16Array;
		if ( format === GPUTextureFormat.R16Float ) return Float32Array;
		if ( format === GPUTextureFormat.RG16Float ) return Float32Array;
		if ( format === GPUTextureFormat.RGBA16Float ) return Float32Array;


		if ( format === GPUTextureFormat.R32Uint ) return Uint32Array;
		if ( format === GPUTextureFormat.R32Sint ) return Int32Array;
		if ( format === GPUTextureFormat.R32Float ) return Float32Array;
		if ( format === GPUTextureFormat.RG32Uint ) return Uint32Array;
		if ( format === GPUTextureFormat.RG32Sint ) return Int32Array;
		if ( format === GPUTextureFormat.RG32Float ) return Float32Array;
		if ( format === GPUTextureFormat.RGBA32Uint ) return Uint32Array;
		if ( format === GPUTextureFormat.RGBA32Sint ) return Int32Array;
		if ( format === GPUTextureFormat.RGBA32Float ) return Float32Array;

		if ( format === GPUTextureFormat.BGRA8Unorm ) return Uint8Array;
		if ( format === GPUTextureFormat.BGRA8UnormSRGB ) return Uint8Array;
		if ( format === GPUTextureFormat.RGB10A2Unorm ) return Uint32Array;
		if ( format === GPUTextureFormat.RGB9E5UFloat ) return Uint32Array;
		if ( format === GPUTextureFormat.RG11B10UFloat ) return Uint32Array;

		if ( format === GPUTextureFormat.Depth32Float ) return Float32Array;
		if ( format === GPUTextureFormat.Depth24Plus ) return Uint32Array;
		if ( format === GPUTextureFormat.Depth24PlusStencil8 ) return Uint32Array;
		if ( format === GPUTextureFormat.Depth32FloatStencil8 ) return Float32Array;

	}

	_getDimension( texture ) {

		let dimension;

		if ( texture.isData3DTexture ) {

			dimension = GPUTextureDimension.ThreeD;

		} else {

			dimension = GPUTextureDimension.TwoD;

		}

		return dimension;

	}

}

function getFormat( texture, device = null ) {

	const format = texture.format;
	const type = texture.type;
	const colorSpace = texture.colorSpace;

	let formatGPU;

	if ( texture.isFramebufferTexture === true && texture.type === UnsignedByteType ) {

		formatGPU = GPUTextureFormat.BGRA8Unorm;

	} else if ( texture.isCompressedTexture === true ) {

		switch ( format ) {

			case RGBA_S3TC_DXT1_Format:
				formatGPU = ( colorSpace === SRGBColorSpace ) ? GPUTextureFormat.BC1RGBAUnormSRGB : GPUTextureFormat.BC1RGBAUnorm;
				break;

			case RGBA_S3TC_DXT3_Format:
				formatGPU = ( colorSpace === SRGBColorSpace ) ? GPUTextureFormat.BC2RGBAUnormSRGB : GPUTextureFormat.BC2RGBAUnorm;
				break;

			case RGBA_S3TC_DXT5_Format:
				formatGPU = ( colorSpace === SRGBColorSpace ) ? GPUTextureFormat.BC3RGBAUnormSRGB : GPUTextureFormat.BC3RGBAUnorm;
				break;

			case RGB_ETC2_Format:
				formatGPU = ( colorSpace === SRGBColorSpace ) ? GPUTextureFormat.ETC2RGB8UnormSRGB : GPUTextureFormat.ETC2RGB8Unorm;
				break;

			case RGBA_ETC2_EAC_Format:
				formatGPU = ( colorSpace === SRGBColorSpace ) ? GPUTextureFormat.ETC2RGBA8UnormSRGB : GPUTextureFormat.ETC2RGBA8Unorm;
				break;

			case RGBA_ASTC_4x4_Format:
				formatGPU = ( colorSpace === SRGBColorSpace ) ? GPUTextureFormat.ASTC4x4UnormSRGB : GPUTextureFormat.ASTC4x4Unorm;
				break;

			case RGBA_ASTC_5x4_Format:
				formatGPU = ( colorSpace === SRGBColorSpace ) ? GPUTextureFormat.ASTC5x4UnormSRGB : GPUTextureFormat.ASTC5x4Unorm;
				break;

			case RGBA_ASTC_5x5_Format:
				formatGPU = ( colorSpace === SRGBColorSpace ) ? GPUTextureFormat.ASTC5x5UnormSRGB : GPUTextureFormat.ASTC5x5Unorm;
				break;

			case RGBA_ASTC_6x5_Format:
				formatGPU = ( colorSpace === SRGBColorSpace ) ? GPUTextureFormat.ASTC6x5UnormSRGB : GPUTextureFormat.ASTC6x5Unorm;
				break;

			case RGBA_ASTC_6x6_Format:
				formatGPU = ( colorSpace === SRGBColorSpace ) ? GPUTextureFormat.ASTC6x6UnormSRGB : GPUTextureFormat.ASTC6x6Unorm;
				break;

			case RGBA_ASTC_8x5_Format:
				formatGPU = ( colorSpace === SRGBColorSpace ) ? GPUTextureFormat.ASTC8x5UnormSRGB : GPUTextureFormat.ASTC8x5Unorm;
				break;

			case RGBA_ASTC_8x6_Format:
				formatGPU = ( colorSpace === SRGBColorSpace ) ? GPUTextureFormat.ASTC8x6UnormSRGB : GPUTextureFormat.ASTC8x6Unorm;
				break;

			case RGBA_ASTC_8x8_Format:
				formatGPU = ( colorSpace === SRGBColorSpace ) ? GPUTextureFormat.ASTC8x8UnormSRGB : GPUTextureFormat.ASTC8x8Unorm;
				break;

			case RGBA_ASTC_10x5_Format:
				formatGPU = ( colorSpace === SRGBColorSpace ) ? GPUTextureFormat.ASTC10x5UnormSRGB : GPUTextureFormat.ASTC10x5Unorm;
				break;

			case RGBA_ASTC_10x6_Format:
				formatGPU = ( colorSpace === SRGBColorSpace ) ? GPUTextureFormat.ASTC10x6UnormSRGB : GPUTextureFormat.ASTC10x6Unorm;
				break;

			case RGBA_ASTC_10x8_Format:
				formatGPU = ( colorSpace === SRGBColorSpace ) ? GPUTextureFormat.ASTC10x8UnormSRGB : GPUTextureFormat.ASTC10x8Unorm;
				break;

			case RGBA_ASTC_10x10_Format:
				formatGPU = ( colorSpace === SRGBColorSpace ) ? GPUTextureFormat.ASTC10x10UnormSRGB : GPUTextureFormat.ASTC10x10Unorm;
				break;

			case RGBA_ASTC_12x10_Format:
				formatGPU = ( colorSpace === SRGBColorSpace ) ? GPUTextureFormat.ASTC12x10UnormSRGB : GPUTextureFormat.ASTC12x10Unorm;
				break;

			case RGBA_ASTC_12x12_Format:
				formatGPU = ( colorSpace === SRGBColorSpace ) ? GPUTextureFormat.ASTC12x12UnormSRGB : GPUTextureFormat.ASTC12x12Unorm;
				break;

			default:
				console.error( 'WebGPURenderer: Unsupported texture format.', format );

		}

	} else {

		switch ( format ) {

			case RGBAFormat:

				switch ( type ) {

					case ByteType:
						formatGPU = GPUTextureFormat.RGBA8Snorm;
						break;

					case ShortType:
						formatGPU = GPUTextureFormat.RGBA16Sint;
						break;

					case UnsignedShortType:
						formatGPU = GPUTextureFormat.RGBA16Uint;
						break;
					case UnsignedIntType:
						formatGPU = GPUTextureFormat.RGBA32Uint;
						break;

					case IntType:
						formatGPU = GPUTextureFormat.RGBA32Sint;
						break;

					case UnsignedByteType:
						formatGPU = ( colorSpace === SRGBColorSpace ) ? GPUTextureFormat.RGBA8UnormSRGB : GPUTextureFormat.RGBA8Unorm;
						break;

					case HalfFloatType:
						formatGPU = GPUTextureFormat.RGBA16Float;
						break;

					case FloatType:
						formatGPU = GPUTextureFormat.RGBA32Float;
						break;

					default:
						console.error( 'WebGPURenderer: Unsupported texture type with RGBAFormat.', type );

				}

				break;

			case RGBFormat:

				switch ( type ) {

					case UnsignedInt5999Type:
						formatGPU = GPUTextureFormat.RGB9E5UFloat;
						break;

					default:
						console.error( 'WebGPURenderer: Unsupported texture type with RGBFormat.', type );

				}

				break;

			case RedFormat:

				switch ( type ) {

					case ByteType:
						formatGPU = GPUTextureFormat.R8Snorm;
						break;

					case ShortType:
						formatGPU = GPUTextureFormat.R16Sint;
						break;

					case UnsignedShortType:
						formatGPU = GPUTextureFormat.R16Uint;
						break;

					case UnsignedIntType:
						formatGPU = GPUTextureFormat.R32Uint;
						break;

					case IntType:
						formatGPU = GPUTextureFormat.R32Sint;
						break;

					case UnsignedByteType:
						formatGPU = GPUTextureFormat.R8Unorm;
						break;

					case HalfFloatType:
						formatGPU = GPUTextureFormat.R16Float;
						break;

					case FloatType:
						formatGPU = GPUTextureFormat.R32Float;
						break;

					default:
						console.error( 'WebGPURenderer: Unsupported texture type with RedFormat.', type );

				}

				break;

			case RGFormat:

				switch ( type ) {

					case ByteType:
						formatGPU = GPUTextureFormat.RG8Snorm;
						break;

					case ShortType:
						formatGPU = GPUTextureFormat.RG16Sint;
						break;

					case UnsignedShortType:
						formatGPU = GPUTextureFormat.RG16Uint;
						break;

					case UnsignedIntType:
						formatGPU = GPUTextureFormat.RG32Uint;
						break;

					case IntType:
						formatGPU = GPUTextureFormat.RG32Sint;
						break;

					case UnsignedByteType:
						formatGPU = GPUTextureFormat.RG8Unorm;
						break;

					case HalfFloatType:
						formatGPU = GPUTextureFormat.RG16Float;
						break;

					case FloatType:
						formatGPU = GPUTextureFormat.RG32Float;
						break;

					default:
						console.error( 'WebGPURenderer: Unsupported texture type with RGFormat.', type );

				}

				break;

			case DepthFormat:

				switch ( type ) {

					case UnsignedShortType:
						formatGPU = GPUTextureFormat.Depth16Unorm;
						break;

					case UnsignedIntType:
						formatGPU = GPUTextureFormat.Depth24Plus;
						break;

					case FloatType:
						formatGPU = GPUTextureFormat.Depth32Float;
						break;

					default:
						console.error( 'WebGPURenderer: Unsupported texture type with DepthFormat.', type );

				}

				break;

			case DepthStencilFormat:

				switch ( type ) {

					case UnsignedInt248Type:
						formatGPU = GPUTextureFormat.Depth24PlusStencil8;
						break;

					case FloatType:

						if ( device && device.features.has( GPUFeatureName.Depth32FloatStencil8 ) === false ) {

							console.error( 'WebGPURenderer: Depth textures with DepthStencilFormat + FloatType can only be used with the "depth32float-stencil8" GPU feature.' );

						}

						formatGPU = GPUTextureFormat.Depth32FloatStencil8;

						break;

					default:
						console.error( 'WebGPURenderer: Unsupported texture type with DepthStencilFormat.', type );

				}

				break;

			case RedIntegerFormat:

				switch ( type ) {

					case IntType:
						formatGPU = GPUTextureFormat.R32Sint;
						break;

					case UnsignedIntType:
						formatGPU = GPUTextureFormat.R32Uint;
						break;

					default:
						console.error( 'WebGPURenderer: Unsupported texture type with RedIntegerFormat.', type );

				}

				break;

			case RGIntegerFormat:

				switch ( type ) {

					case IntType:
						formatGPU = GPUTextureFormat.RG32Sint;
						break;

					case UnsignedIntType:
						formatGPU = GPUTextureFormat.RG32Uint;
						break;

					default:
						console.error( 'WebGPURenderer: Unsupported texture type with RGIntegerFormat.', type );

				}

				break;

			case RGBAIntegerFormat:

				switch ( type ) {

					case IntType:
						formatGPU = GPUTextureFormat.RGBA32Sint;
						break;

					case UnsignedIntType:
						formatGPU = GPUTextureFormat.RGBA32Uint;
						break;

					default:
						console.error( 'WebGPURenderer: Unsupported texture type with RGBAIntegerFormat.', type );

				}

				break;

			default:
				console.error( 'WebGPURenderer: Unsupported texture format.', format );

		}

	}

	return formatGPU;

}

const declarationRegexp = /^[fn]*\s*([a-z_0-9]+)?\s*\(([\s\S]*?)\)\s*[\-\>]*\s*([a-z_0-9]+(?:<[\s\S]+?>)?)/i;
const propertiesRegexp = /([a-z_0-9]+)\s*:\s*([a-z_0-9]+(?:<[\s\S]+?>)?)/ig;

const wgslTypeLib$1 = {
	'f32': 'float',
	'i32': 'int',
	'u32': 'uint',
	'bool': 'bool',

	'vec2<f32>': 'vec2',
 	'vec2<i32>': 'ivec2',
 	'vec2<u32>': 'uvec2',
 	'vec2<bool>': 'bvec2',

	'vec2f': 'vec2',
	'vec2i': 'ivec2',
	'vec2u': 'uvec2',
	'vec2b': 'bvec2',

	'vec3<f32>': 'vec3',
	'vec3<i32>': 'ivec3',
	'vec3<u32>': 'uvec3',
	'vec3<bool>': 'bvec3',

	'vec3f': 'vec3',
	'vec3i': 'ivec3',
	'vec3u': 'uvec3',
	'vec3b': 'bvec3',

	'vec4<f32>': 'vec4',
	'vec4<i32>': 'ivec4',
	'vec4<u32>': 'uvec4',
	'vec4<bool>': 'bvec4',

	'vec4f': 'vec4',
	'vec4i': 'ivec4',
	'vec4u': 'uvec4',
	'vec4b': 'bvec4',

	'mat2x2<f32>': 'mat2',
	'mat2x2f': 'mat2',

	'mat3x3<f32>': 'mat3',
	'mat3x3f': 'mat3',

	'mat4x4<f32>': 'mat4',
	'mat4x4f': 'mat4',

	'sampler': 'sampler',
	'texture_2d': 'texture',
	'texture_cube': 'cubeTexture',
	'texture_depth_2d': 'depthTexture',
	'texture_storage_2d': 'storageTexture',
	'texture_3d': 'texture3D'

};

const parse = ( source ) => {

	source = source.trim();

	const declaration = source.match( declarationRegexp );

	if ( declaration !== null && declaration.length === 4 ) {

		const inputsCode = declaration[ 2 ];
		const propsMatches = [];
		let match = null;

		while ( ( match = propertiesRegexp.exec( inputsCode ) ) !== null ) {

			propsMatches.push( { name: match[ 1 ], type: match[ 2 ] } );

		}

		// Process matches to correctly pair names and types
		const inputs = [];
		for ( let i = 0; i < propsMatches.length; i ++ ) {

			const { name, type } = propsMatches[ i ];

			let resolvedType = type;

			if ( resolvedType.startsWith( 'texture' ) ) {

				resolvedType = type.split( '<' )[ 0 ];

			}

			resolvedType = wgslTypeLib$1[ resolvedType ] || resolvedType;

			inputs.push( new NodeFunctionInput( resolvedType, name ) );

		}

		const blockCode = source.substring( declaration[ 0 ].length );
		const outputType = declaration[ 3 ] || 'void';

		const name = declaration[ 1 ] !== undefined ? declaration[ 1 ] : '';
		const type = wgslTypeLib$1[ outputType ] || outputType;

		return {
			type,
			inputs,
			name,
			inputsCode,
			blockCode,
			outputType
		};

	} else {

		throw new Error( 'FunctionNode: Function is not a WGSL code.' );

	}

};

class WGSLNodeFunction extends NodeFunction {

	constructor( source ) {

		const { type, inputs, name, inputsCode, blockCode, outputType } = parse( source );

		super( type, inputs, name );

		this.inputsCode = inputsCode;
		this.blockCode = blockCode;
		this.outputType = outputType;

	}

	getCode( name = this.name ) {

		const outputType = this.outputType !== 'void' ? '-> ' + this.outputType : '';

		return `fn ${ name } ( ${ this.inputsCode.trim() } ) ${ outputType }` + this.blockCode;

	}

}

class WGSLNodeParser extends NodeParser {

	parseFunction( source ) {

		return new WGSLNodeFunction( source );

	}

}

// GPUShaderStage is not defined in browsers not supporting WebGPU
const GPUShaderStage = self.GPUShaderStage;

const gpuShaderStageLib = {
	'vertex': GPUShaderStage ? GPUShaderStage.VERTEX : 1,
	'fragment': GPUShaderStage ? GPUShaderStage.FRAGMENT : 2,
	'compute': GPUShaderStage ? GPUShaderStage.COMPUTE : 4
};

const supports = {
	instance: true,
	swizzleAssign: false,
	storageBuffer: true
};

const wgslFnOpLib = {
	'^^': 'threejs_xor'
};

const wgslTypeLib = {
	float: 'f32',
	int: 'i32',
	uint: 'u32',
	bool: 'bool',
	color: 'vec3<f32>',

	vec2: 'vec2<f32>',
	ivec2: 'vec2<i32>',
	uvec2: 'vec2<u32>',
	bvec2: 'vec2<bool>',

	vec3: 'vec3<f32>',
	ivec3: 'vec3<i32>',
	uvec3: 'vec3<u32>',
	bvec3: 'vec3<bool>',

	vec4: 'vec4<f32>',
	ivec4: 'vec4<i32>',
	uvec4: 'vec4<u32>',
	bvec4: 'vec4<bool>',

	mat2: 'mat2x2<f32>',
	imat2: 'mat2x2<i32>',
	umat2: 'mat2x2<u32>',
	bmat2: 'mat2x2<bool>',

	mat3: 'mat3x3<f32>',
	imat3: 'mat3x3<i32>',
	umat3: 'mat3x3<u32>',
	bmat3: 'mat3x3<bool>',

	mat4: 'mat4x4<f32>',
	imat4: 'mat4x4<i32>',
	umat4: 'mat4x4<u32>',
	bmat4: 'mat4x4<bool>'
};

const wgslMethods = {
	dFdx: 'dpdx',
	dFdy: '- dpdy',
	mod_float: 'threejs_mod_float',
	mod_vec2: 'threejs_mod_vec2',
	mod_vec3: 'threejs_mod_vec3',
	mod_vec4: 'threejs_mod_vec4',
	equals_bool: 'threejs_equals_bool',
	equals_bvec2: 'threejs_equals_bvec2',
	equals_bvec3: 'threejs_equals_bvec3',
	equals_bvec4: 'threejs_equals_bvec4',
	lessThanEqual: 'threejs_lessThanEqual',
	greaterThan: 'threejs_greaterThan',
	inversesqrt: 'inverseSqrt',
	bitcast: 'bitcast<f32>'
};

const wgslPolyfill = {
	threejs_xor: new CodeNode( `
fn threejs_xor( a : bool, b : bool ) -> bool {

	return ( a || b ) && !( a && b );

}
` ),
	lessThanEqual: new CodeNode( `
fn threejs_lessThanEqual( a : vec3<f32>, b : vec3<f32> ) -> vec3<bool> {

	return vec3<bool>( a.x <= b.x, a.y <= b.y, a.z <= b.z );

}
` ),
	greaterThan: new CodeNode( `
fn threejs_greaterThan( a : vec3<f32>, b : vec3<f32> ) -> vec3<bool> {

	return vec3<bool>( a.x > b.x, a.y > b.y, a.z > b.z );

}
` ),
	mod_float: new CodeNode( 'fn threejs_mod_float( x : f32, y : f32 ) -> f32 { return x - y * floor( x / y ); }' ),
	mod_vec2: new CodeNode( 'fn threejs_mod_vec2( x : vec2f, y : vec2f ) -> vec2f { return x - y * floor( x / y ); }' ),
	mod_vec3: new CodeNode( 'fn threejs_mod_vec3( x : vec3f, y : vec3f ) -> vec3f { return x - y * floor( x / y ); }' ),
	mod_vec4: new CodeNode( 'fn threejs_mod_vec4( x : vec4f, y : vec4f ) -> vec4f { return x - y * floor( x / y ); }' ),
	equals_bool: new CodeNode( 'fn threejs_equals_bool( a : bool, b : bool ) -> bool { return a == b; }' ),
	equals_bvec2: new CodeNode( 'fn threejs_equals_bvec2( a : vec2f, b : vec2f ) -> vec2<bool> { return vec2<bool>( a.x == b.x, a.y == b.y ); }' ),
	equals_bvec3: new CodeNode( 'fn threejs_equals_bvec3( a : vec3f, b : vec3f ) -> vec3<bool> { return vec3<bool>( a.x == b.x, a.y == b.y, a.z == b.z ); }' ),
	equals_bvec4: new CodeNode( 'fn threejs_equals_bvec4( a : vec4f, b : vec4f ) -> vec4<bool> { return vec4<bool>( a.x == b.x, a.y == b.y, a.z == b.z, a.w == b.w ); }' ),
	repeatWrapping: new CodeNode( `
fn threejs_repeatWrapping( uv : vec2<f32>, dimension : vec2<u32> ) -> vec2<u32> {

	let uvScaled = vec2<u32>( uv * vec2<f32>( dimension ) );

	return ( ( uvScaled % dimension ) + dimension ) % dimension;

}
` ),
	biquadraticTexture: new CodeNode( `
fn threejs_biquadraticTexture( map : texture_2d<f32>, coord : vec2f, level : i32 ) -> vec4f {

	let res = vec2f( textureDimensions( map, level ) );

	let uvScaled = coord * res;
	let uvWrapping = ( ( uvScaled % res ) + res ) % res;

	// https://www.shadertoy.com/view/WtyXRy

	let uv = uvWrapping - 0.5;
	let iuv = floor( uv );
	let f = fract( uv );

	let rg1 = textureLoad( map, vec2i( iuv + vec2( 0.5, 0.5 ) ), level );
	let rg2 = textureLoad( map, vec2i( iuv + vec2( 1.5, 0.5 ) ), level );
	let rg3 = textureLoad( map, vec2i( iuv + vec2( 0.5, 1.5 ) ), level );
	let rg4 = textureLoad( map, vec2i( iuv + vec2( 1.5, 1.5 ) ), level );

	return mix( mix( rg1, rg2, f.x ), mix( rg3, rg4, f.x ), f.y );

}
` )
};

class WGSLNodeBuilder extends NodeBuilder {

	constructor( object, renderer ) {

		super( object, renderer, new WGSLNodeParser() );

		this.uniformGroups = {};

		this.builtins = {};

	}

	needsColorSpaceToLinear( texture ) {

		return texture.isVideoTexture === true && texture.colorSpace !== NoColorSpace;

	}

	_generateTextureSample( texture, textureProperty, uvSnippet, depthSnippet, shaderStage = this.shaderStage ) {

		if ( shaderStage === 'fragment' ) {

			if ( depthSnippet ) {

				return `textureSample( ${ textureProperty }, ${ textureProperty }_sampler, ${ uvSnippet }, ${ depthSnippet } )`;

			} else {

				return `textureSample( ${ textureProperty }, ${ textureProperty }_sampler, ${ uvSnippet } )`;

			}

		} else if ( this.isFilteredTexture( texture ) ) {

			return this.generateFilteredTexture( texture, textureProperty, uvSnippet );

		} else {

			return this.generateTextureLod( texture, textureProperty, uvSnippet, '0' );

		}

	}

	_generateVideoSample( textureProperty, uvSnippet, shaderStage = this.shaderStage ) {

		if ( shaderStage === 'fragment' ) {

			return `textureSampleBaseClampToEdge( ${ textureProperty }, ${ textureProperty }_sampler, vec2<f32>( ${ uvSnippet }.x, 1.0 - ${ uvSnippet }.y ) )`;

		} else {

			console.error( `WebGPURenderer: THREE.VideoTexture does not support ${ shaderStage } shader.` );

		}

	}

	_generateTextureSampleLevel( texture, textureProperty, uvSnippet, levelSnippet, depthSnippet, shaderStage = this.shaderStage ) {

		if ( shaderStage === 'fragment' && this.isUnfilterable( texture ) === false ) {

			return `textureSampleLevel( ${ textureProperty }, ${ textureProperty }_sampler, ${ uvSnippet }, ${ levelSnippet } )`;

		} else if ( this.isFilteredTexture( texture ) ) {

			return this.generateFilteredTexture( texture, textureProperty, uvSnippet, levelSnippet );

		} else {

			return this.generateTextureLod( texture, textureProperty, uvSnippet, levelSnippet );

		}

	}

	generateFilteredTexture( texture, textureProperty, uvSnippet, levelSnippet = '0' ) {

		this._include( 'biquadraticTexture' );

		return `threejs_biquadraticTexture( ${ textureProperty }, ${ uvSnippet }, i32( ${ levelSnippet } ) )`;

	}

	generateTextureLod( texture, textureProperty, uvSnippet, levelSnippet = '0' ) {

		this._include( 'repeatWrapping' );

		const dimension = texture.isMultisampleRenderTargetTexture === true ? `textureDimensions( ${ textureProperty } )` : `textureDimensions( ${ textureProperty }, 0 )`;

		return `textureLoad( ${ textureProperty }, threejs_repeatWrapping( ${ uvSnippet }, ${ dimension } ), i32( ${ levelSnippet } ) )`;

	}

	generateTextureLoad( texture, textureProperty, uvIndexSnippet, depthSnippet, levelSnippet = '0u' ) {

		if ( depthSnippet ) {

			return `textureLoad( ${ textureProperty }, ${ uvIndexSnippet }, ${ depthSnippet }, ${ levelSnippet } )`;

		} else {

			return `textureLoad( ${ textureProperty }, ${ uvIndexSnippet }, ${ levelSnippet } )`;

		}

	}

	generateTextureStore( texture, textureProperty, uvIndexSnippet, valueSnippet ) {

		return `textureStore( ${ textureProperty }, ${ uvIndexSnippet }, ${ valueSnippet } )`;

	}

	isUnfilterable( texture ) {

		return this.getComponentTypeFromTexture( texture ) !== 'float' || ( texture.isDataTexture === true && texture.type === FloatType ) || texture.isMultisampleRenderTargetTexture === true;

	}

	generateTexture( texture, textureProperty, uvSnippet, depthSnippet, shaderStage = this.shaderStage ) {

		let snippet = null;

		if ( texture.isVideoTexture === true ) {

			snippet = this._generateVideoSample( textureProperty, uvSnippet, shaderStage );

		} else if ( this.isUnfilterable( texture ) ) {

			snippet = this.generateTextureLod( texture, textureProperty, uvSnippet, '0', depthSnippet, shaderStage );

		} else {

			snippet = this._generateTextureSample( texture, textureProperty, uvSnippet, depthSnippet, shaderStage );

		}

		return snippet;

	}

	generateTextureGrad( texture, textureProperty, uvSnippet, gradSnippet, depthSnippet, shaderStage = this.shaderStage ) {

		if ( shaderStage === 'fragment' ) {

			// TODO handle i32 or u32 --> uvSnippet, array_index: A, ddx, ddy
			return `textureSampleGrad( ${ textureProperty }, ${ textureProperty }_sampler, ${ uvSnippet },  ${ gradSnippet[ 0 ] }, ${ gradSnippet[ 1 ] } )`;

		} else {

			console.error( `WebGPURenderer: THREE.TextureNode.gradient() does not support ${ shaderStage } shader.` );

		}

	}

	generateTextureCompare( texture, textureProperty, uvSnippet, compareSnippet, depthSnippet, shaderStage = this.shaderStage ) {

		if ( shaderStage === 'fragment' ) {

			return `textureSampleCompare( ${ textureProperty }, ${ textureProperty }_sampler, ${ uvSnippet }, ${ compareSnippet } )`;

		} else {

			console.error( `WebGPURenderer: THREE.DepthTexture.compareFunction() does not support ${ shaderStage } shader.` );

		}

	}

	generateTextureLevel( texture, textureProperty, uvSnippet, levelSnippet, depthSnippet, shaderStage = this.shaderStage ) {

		let snippet = null;

		if ( texture.isVideoTexture === true ) {

			snippet = this._generateVideoSample( textureProperty, uvSnippet, shaderStage );

		} else {

			snippet = this._generateTextureSampleLevel( texture, textureProperty, uvSnippet, levelSnippet, depthSnippet, shaderStage );

		}

		return snippet;

	}

	generateTextureBias( texture, textureProperty, uvSnippet, biasSnippet, depthSnippet, shaderStage = this.shaderStage ) {

		if ( shaderStage === 'fragment' ) {

			return `textureSampleBias( ${ textureProperty }, ${ textureProperty }_sampler, ${ uvSnippet }, ${ biasSnippet } )`;

		} else {

			console.error( `WebGPURenderer: THREE.TextureNode.biasNode does not support ${ shaderStage } shader.` );

		}

	}

	getPropertyName( node, shaderStage = this.shaderStage ) {

		if ( node.isNodeVarying === true && node.needsInterpolation === true ) {

			if ( shaderStage === 'vertex' ) {

				return `varyings.${ node.name }`;

			}

		} else if ( node.isNodeUniform === true ) {

			const name = node.name;
			const type = node.type;

			if ( type === 'texture' || type === 'cubeTexture' || type === 'storageTexture' || type === 'texture3D' ) {

				return name;

			} else if ( type === 'buffer' || type === 'storageBuffer' ) {

				return `NodeBuffer_${ node.id }.${name}`;

			} else {

				return node.groupNode.name + '.' + name;

			}

		}

		return super.getPropertyName( node );

	}

	getOutputStructName() {

		return 'output';

	}

	_getUniformGroupCount( shaderStage ) {

		return Object.keys( this.uniforms[ shaderStage ] ).length;

	}

	getFunctionOperator( op ) {

		const fnOp = wgslFnOpLib[ op ];

		if ( fnOp !== undefined ) {

			this._include( fnOp );

			return fnOp;

		}

		return null;

	}

	getStorageAccess( node ) {

		if ( node.isStorageTextureNode ) {

			switch ( node.access ) {

				case GPUStorageTextureAccess.ReadOnly:

					return 'read';

				case GPUStorageTextureAccess.WriteOnly:

					return 'write';

				default:

					return 'read_write';

			}

		} else {

			switch ( node.access ) {

				case GPUBufferBindingType.Storage:

					return 'read_write';


				case GPUBufferBindingType.ReadOnlyStorage:

					return 'read';

				default:

					return 'write';

			}

		}

	}

	getUniformFromNode( node, type, shaderStage, name = null ) {

		const uniformNode = super.getUniformFromNode( node, type, shaderStage, name );
		const nodeData = this.getDataFromNode( node, shaderStage, this.globalCache );

		if ( nodeData.uniformGPU === undefined ) {

			let uniformGPU;

			const group = node.groupNode;
			const groupName = group.name;

			const bindings = this.getBindGroupArray( groupName, shaderStage );

			if ( type === 'texture' || type === 'cubeTexture' || type === 'storageTexture' || type === 'texture3D' ) {

				let texture = null;

				if ( type === 'texture' || type === 'storageTexture' ) {

					texture = new NodeSampledTexture( uniformNode.name, uniformNode.node, group, node.access ? node.access : null );

				} else if ( type === 'cubeTexture' ) {

					texture = new NodeSampledCubeTexture( uniformNode.name, uniformNode.node, group, node.access ? node.access : null );

				} else if ( type === 'texture3D' ) {

					texture = new NodeSampledTexture3D( uniformNode.name, uniformNode.node, group, node.access ? node.access : null );

				}

				texture.store = node.isStorageTextureNode === true;
				texture.setVisibility( gpuShaderStageLib[ shaderStage ] );

				if ( shaderStage === 'fragment' && this.isUnfilterable( node.value ) === false && texture.store === false ) {

					const sampler = new NodeSampler( `${uniformNode.name}_sampler`, uniformNode.node, group );
					sampler.setVisibility( gpuShaderStageLib[ shaderStage ] );

					bindings.push( sampler, texture );

					uniformGPU = [ sampler, texture ];

				} else {

					bindings.push( texture );

					uniformGPU = [ texture ];

				}

			} else if ( type === 'buffer' || type === 'storageBuffer' ) {

				const bufferClass = type === 'storageBuffer' ? NodeStorageBuffer : NodeUniformBuffer;
				const buffer = new bufferClass( node, group );
				buffer.setVisibility( gpuShaderStageLib[ shaderStage ] );

				bindings.push( buffer );

				uniformGPU = buffer;

			} else {

				const uniformsStage = this.uniformGroups[ shaderStage ] || ( this.uniformGroups[ shaderStage ] = {} );

				let uniformsGroup = uniformsStage[ groupName ];

				if ( uniformsGroup === undefined ) {

					uniformsGroup = new NodeUniformsGroup( groupName, group );
					uniformsGroup.setVisibility( gpuShaderStageLib[ shaderStage ] );

					uniformsStage[ groupName ] = uniformsGroup;

					bindings.push( uniformsGroup );

				}

				uniformGPU = this.getNodeUniform( uniformNode, type );

				uniformsGroup.addUniform( uniformGPU );

			}

			nodeData.uniformGPU = uniformGPU;

		}

		return uniformNode;

	}

	getBuiltin( name, property, type, shaderStage = this.shaderStage ) {

		const map = this.builtins[ shaderStage ] || ( this.builtins[ shaderStage ] = new Map() );

		if ( map.has( name ) === false ) {

			map.set( name, {
				name,
				property,
				type
			} );

		}

		return property;

	}

	getVertexIndex() {

		if ( this.shaderStage === 'vertex' ) {

			return this.getBuiltin( 'vertex_index', 'vertexIndex', 'u32', 'attribute' );

		}

		return 'vertexIndex';

	}

	buildFunctionCode( shaderNode ) {

		const layout = shaderNode.layout;
		const flowData = this.flowShaderNode( shaderNode );

		const parameters = [];

		for ( const input of layout.inputs ) {

			parameters.push( input.name + ' : ' + this.getType( input.type ) );

		}

		//

		const code = `fn ${ layout.name }( ${ parameters.join( ', ' ) } ) -> ${ this.getType( layout.type ) } {
${ flowData.vars }
${ flowData.code }
	return ${ flowData.result };

}`;

		//

		return code;

	}

	getInstanceIndex() {

		if ( this.shaderStage === 'vertex' ) {

			return this.getBuiltin( 'instance_index', 'instanceIndex', 'u32', 'attribute' );

		}

		return 'instanceIndex';

	}

	getDrawIndex() {

		return null;

	}

	getFrontFacing() {

		return this.getBuiltin( 'front_facing', 'isFront', 'bool' );

	}

	getFragCoord() {

		return this.getBuiltin( 'position', 'fragCoord', 'vec4<f32>' ) + '.xyz';

	}

	getFragDepth() {

		return 'output.' + this.getBuiltin( 'frag_depth', 'depth', 'f32', 'output' );

	}

	isFlipY() {

		return false;

	}

	getBuiltins( shaderStage ) {

		const snippets = [];
		const builtins = this.builtins[ shaderStage ];

		if ( builtins !== undefined ) {

			for ( const { name, property, type } of builtins.values() ) {

				snippets.push( `@builtin( ${name} ) ${property} : ${type}` );

			}

		}

		return snippets.join( ',\n\t' );

	}

	getAttributes( shaderStage ) {

		const snippets = [];

		if ( shaderStage === 'compute' ) {

			this.getBuiltin( 'global_invocation_id', 'id', 'vec3<u32>', 'attribute' );

		}

		if ( shaderStage === 'vertex' || shaderStage === 'compute' ) {

			const builtins = this.getBuiltins( 'attribute' );

			if ( builtins ) snippets.push( builtins );

			const attributes = this.getAttributesArray();

			for ( let index = 0, length = attributes.length; index < length; index ++ ) {

				const attribute = attributes[ index ];
				const name = attribute.name;
				const type = this.getType( attribute.type );

				snippets.push( `@location( ${index} ) ${ name } : ${ type }` );

			}

		}

		return snippets.join( ',\n\t' );

	}

	getStructMembers( struct ) {

		const snippets = [];
		const members = struct.getMemberTypes();

		for ( let i = 0; i < members.length; i ++ ) {

			const member = members[ i ];
			snippets.push( `\t@location( ${i} ) m${i} : ${ member }<f32>` );

		}

		const builtins = this.getBuiltins( 'output' );

		if ( builtins ) snippets.push( builtins );

		return snippets.join( ',\n' );

	}

	getStructs( shaderStage ) {

		const snippets = [];
		const structs = this.structs[ shaderStage ];

		for ( let index = 0, length = structs.length; index < length; index ++ ) {

			const struct = structs[ index ];
			const name = struct.name;

			let snippet = `\struct ${ name } {\n`;
			snippet += this.getStructMembers( struct );
			snippet += '\n}';


			snippets.push( snippet );

			snippets.push( `\nvar<private> output : ${ name };\n\n` );

		}

		return snippets.join( '\n\n' );

	}

	getVar( type, name ) {

		return `var ${ name } : ${ this.getType( type ) }`;

	}

	getVars( shaderStage ) {

		const snippets = [];
		const vars = this.vars[ shaderStage ];

		if ( vars !== undefined ) {

			for ( const variable of vars ) {

				snippets.push( `\t${ this.getVar( variable.type, variable.name ) };` );

			}

		}

		return `\n${ snippets.join( '\n' ) }\n`;

	}

	getVaryings( shaderStage ) {

		const snippets = [];

		if ( shaderStage === 'vertex' ) {

			this.getBuiltin( 'position', 'Vertex', 'vec4<f32>', 'vertex' );

		}

		if ( shaderStage === 'vertex' || shaderStage === 'fragment' ) {

			const varyings = this.varyings;
			const vars = this.vars[ shaderStage ];

			for ( let index = 0; index < varyings.length; index ++ ) {

				const varying = varyings[ index ];

				if ( varying.needsInterpolation ) {

					let attributesSnippet = `@location( ${index} )`;

					if ( /^(int|uint|ivec|uvec)/.test( varying.type ) ) {

						attributesSnippet += ' @interpolate( flat )';


					}

					snippets.push( `${ attributesSnippet } ${ varying.name } : ${ this.getType( varying.type ) }` );

				} else if ( shaderStage === 'vertex' && vars.includes( varying ) === false ) {

					vars.push( varying );

				}

			}

		}

		const builtins = this.getBuiltins( shaderStage );

		if ( builtins ) snippets.push( builtins );

		const code = snippets.join( ',\n\t' );

		return shaderStage === 'vertex' ? this._getWGSLStruct( 'VaryingsStruct', '\t' + code ) : code;

	}

	getUniforms( shaderStage ) {

		const uniforms = this.uniforms[ shaderStage ];

		const bindingSnippets = [];
		const bufferSnippets = [];
		const structSnippets = [];
		const uniformGroups = {};

		for ( const uniform of uniforms ) {

			const groundName = uniform.groupNode.name;
			const uniformIndexes = this.bindingsIndexes[ groundName ];

			if ( uniform.type === 'texture' || uniform.type === 'cubeTexture' || uniform.type === 'storageTexture' || uniform.type === 'texture3D' ) {

				const texture = uniform.node.value;

				if ( shaderStage === 'fragment' && this.isUnfilterable( texture ) === false && uniform.node.isStorageTextureNode !== true ) {

					if ( texture.isDepthTexture === true && texture.compareFunction !== null ) {

						bindingSnippets.push( `@binding( ${ uniformIndexes.binding ++ } ) @group( ${ uniformIndexes.group } ) var ${ uniform.name }_sampler : sampler_comparison;` );

					} else {

						bindingSnippets.push( `@binding( ${ uniformIndexes.binding ++ } ) @group( ${ uniformIndexes.group } ) var ${ uniform.name }_sampler : sampler;` );

					}

				}

				let textureType;

				let multisampled = '';

				if ( texture.isMultisampleRenderTargetTexture === true ) {

					multisampled = '_multisampled';

				}

				if ( texture.isCubeTexture === true ) {

					textureType = 'texture_cube<f32>';

				} else if ( texture.isDataArrayTexture === true ) {

					textureType = 'texture_2d_array<f32>';

				} else if ( texture.isDepthTexture === true ) {

					textureType = `texture_depth${multisampled}_2d`;

				} else if ( texture.isVideoTexture === true ) {

					textureType = 'texture_external';

				} else if ( texture.isData3DTexture === true ) {

					textureType = 'texture_3d<f32>';

				} else if ( uniform.node.isStorageTextureNode === true ) {

					const format = getFormat( texture );
					const access = this.getStorageAccess( uniform.node );

					textureType = `texture_storage_2d<${ format }, ${ access }>`;

				} else {

					const componentPrefix = this.getComponentTypeFromTexture( texture ).charAt( 0 );

					textureType = `texture${multisampled}_2d<${ componentPrefix }32>`;

				}

				bindingSnippets.push( `@binding( ${ uniformIndexes.binding ++ } ) @group( ${ uniformIndexes.group } ) var ${ uniform.name } : ${ textureType };` );

			} else if ( uniform.type === 'buffer' || uniform.type === 'storageBuffer' ) {

				const bufferNode = uniform.node;
				const bufferType = this.getType( bufferNode.bufferType );
				const bufferCount = bufferNode.bufferCount;

				const bufferCountSnippet = bufferCount > 0 ? ', ' + bufferCount : '';
				const bufferSnippet = `\t${ uniform.name } : array< ${ bufferType }${ bufferCountSnippet } >\n`;
				const bufferAccessMode = bufferNode.isStorageBufferNode ? `storage, ${ this.getStorageAccess( bufferNode ) }` : 'uniform';

				bufferSnippets.push( this._getWGSLStructBinding( 'NodeBuffer_' + bufferNode.id, bufferSnippet, bufferAccessMode, uniformIndexes.binding ++, uniformIndexes.group ) );

			} else {

				const vectorType = this.getType( this.getVectorType( uniform.type ) );
				const groupName = uniform.groupNode.name;

				const group = uniformGroups[ groupName ] || ( uniformGroups[ groupName ] = {
					index: uniformIndexes.binding ++,
					id: uniformIndexes.group,
					snippets: []
				} );

				group.snippets.push( `\t${ uniform.name } : ${ vectorType }` );

			}

		}

		for ( const name in uniformGroups ) {

			const group = uniformGroups[ name ];

			structSnippets.push( this._getWGSLStructBinding( name, group.snippets.join( ',\n' ), 'uniform', group.index, group.id ) );

		}

		let code = bindingSnippets.join( '\n' );
		code += bufferSnippets.join( '\n' );
		code += structSnippets.join( '\n' );

		return code;

	}

	buildCode() {

		const shadersData = this.material !== null ? { fragment: {}, vertex: {} } : { compute: {} };

		for ( const shaderStage in shadersData ) {

			const stageData = shadersData[ shaderStage ];
			stageData.uniforms = this.getUniforms( shaderStage );
			stageData.attributes = this.getAttributes( shaderStage );
			stageData.varyings = this.getVaryings( shaderStage );
			stageData.structs = this.getStructs( shaderStage );
			stageData.vars = this.getVars( shaderStage );
			stageData.codes = this.getCodes( shaderStage );

			//

			let flow = '// code\n\n';
			flow += this.flowCode[ shaderStage ];

			const flowNodes = this.flowNodes[ shaderStage ];
			const mainNode = flowNodes[ flowNodes.length - 1 ];

			const outputNode = mainNode.outputNode;
			const isOutputStruct = ( outputNode !== undefined && outputNode.isOutputStructNode === true );

			for ( const node of flowNodes ) {

				const flowSlotData = this.getFlowData( node/*, shaderStage*/ );
				const slotName = node.name;

				if ( slotName ) {

					if ( flow.length > 0 ) flow += '\n';

					flow += `\t// flow -> ${ slotName }\n\t`;

				}

				flow += `${ flowSlotData.code }\n\t`;

				if ( node === mainNode && shaderStage !== 'compute' ) {

					flow += '// result\n\n\t';

					if ( shaderStage === 'vertex' ) {

						flow += `varyings.Vertex = ${ flowSlotData.result };`;

					} else if ( shaderStage === 'fragment' ) {

						if ( isOutputStruct ) {

							stageData.returnType = outputNode.nodeType;

							flow += `return ${ flowSlotData.result };`;

						} else {

							let structSnippet = '\t@location(0) color: vec4<f32>';

							const builtins = this.getBuiltins( 'output' );

							if ( builtins ) structSnippet += ',\n\t' + builtins;

							stageData.returnType = 'OutputStruct';
							stageData.structs += this._getWGSLStruct( 'OutputStruct', structSnippet );
							stageData.structs += '\nvar<private> output : OutputStruct;\n\n';

							flow += `output.color = ${ flowSlotData.result };\n\n\treturn output;`;

						}

					}

				}

			}

			stageData.flow = flow;


		}

		if ( this.material !== null ) {

			this.vertexShader = this._getWGSLVertexCode( shadersData.vertex );
			this.fragmentShader = this._getWGSLFragmentCode( shadersData.fragment );

		} else {

			this.computeShader = this._getWGSLComputeCode( shadersData.compute, ( this.object.workgroupSize || [ 64 ] ).join( ', ' ) );

		}

	}

	getMethod( method, output = null ) {

		let wgslMethod;

		if ( output !== null ) {

			wgslMethod = this._getWGSLMethod( method + '_' + output );

		}

		if ( wgslMethod === undefined ) {

			wgslMethod = this._getWGSLMethod( method );

		}

		return wgslMethod || method;

	}

	getType( type ) {

		return wgslTypeLib[ type ] || type;

	}

	isAvailable( name ) {

		let result = supports[ name ];

		if ( result === undefined ) {

			if ( name === 'float32Filterable' ) {

				result = this.renderer.hasFeature( 'float32-filterable' );

			}

			supports[ name ] = result;

		}

		return result;

	}

	_getWGSLMethod( method ) {

		if ( wgslPolyfill[ method ] !== undefined ) {

			this._include( method );

		}

		return wgslMethods[ method ];

	}

	_include( name ) {

		const codeNode = wgslPolyfill[ name ];
		codeNode.build( this );

		if ( this.currentFunctionNode !== null ) {

			this.currentFunctionNode.includes.push( codeNode );

		}

		return codeNode;

	}

	_getWGSLVertexCode( shaderData ) {

		return `${ this.getSignature() }

// uniforms
${shaderData.uniforms}

// varyings
${shaderData.varyings}
var<private> varyings : VaryingsStruct;

// codes
${shaderData.codes}

@vertex
fn main( ${shaderData.attributes} ) -> VaryingsStruct {

	// vars
	${shaderData.vars}

	// flow
	${shaderData.flow}

	return varyings;

}
`;

	}

	_getWGSLFragmentCode( shaderData ) {

		return `${ this.getSignature() }

// uniforms
${shaderData.uniforms}

// structs
${shaderData.structs}

// codes
${shaderData.codes}

@fragment
fn main( ${shaderData.varyings} ) -> ${shaderData.returnType} {

	// vars
	${shaderData.vars}

	// flow
	${shaderData.flow}

}
`;

	}

	_getWGSLComputeCode( shaderData, workgroupSize ) {

		return `${ this.getSignature() }
// system
var<private> instanceIndex : u32;

// uniforms
${shaderData.uniforms}

// codes
${shaderData.codes}

@compute @workgroup_size( ${workgroupSize} )
fn main( ${shaderData.attributes} ) {

	// system
	instanceIndex = id.x;

	// vars
	${shaderData.vars}

	// flow
	${shaderData.flow}

}
`;

	}

	_getWGSLStruct( name, vars ) {

		return `
struct ${name} {
${vars}
};`;

	}

	_getWGSLStructBinding( name, vars, access, binding = 0, group = 0 ) {

		const structName = name + 'Struct';
		const structSnippet = this._getWGSLStruct( structName, vars );

		return `${structSnippet}
@binding( ${binding} ) @group( ${group} )
var<${access}> ${name} : ${structName};`;

	}

}

class WebGPUUtils {

	constructor( backend ) {

		this.backend = backend;

	}

	getCurrentDepthStencilFormat( renderContext ) {

		let format;

		if ( renderContext.depthTexture !== null ) {

			format = this.getTextureFormatGPU( renderContext.depthTexture );

		} else if ( renderContext.depth && renderContext.stencil ) {

			format = GPUTextureFormat.Depth24PlusStencil8;

		} else if ( renderContext.depth ) {

			format = GPUTextureFormat.Depth24Plus;

		}

		return format;

	}

	getTextureFormatGPU( texture ) {

		return this.backend.get( texture ).texture.format;

	}

	getCurrentColorFormat( renderContext ) {

		let format;

		if ( renderContext.textures !== null ) {

			format = this.getTextureFormatGPU( renderContext.textures[ 0 ] );


		} else {

			format = GPUTextureFormat.BGRA8Unorm; // default context format

		}

		return format;

	}

	getCurrentColorSpace( renderContext ) {

		if ( renderContext.textures !== null ) {

			return renderContext.textures[ 0 ].colorSpace;

		}

		return this.backend.renderer.outputColorSpace;

	}

	getPrimitiveTopology( object, material ) {

		if ( object.isPoints ) return GPUPrimitiveTopology.PointList;
		else if ( object.isLineSegments || ( object.isMesh && material.wireframe === true ) ) return GPUPrimitiveTopology.LineList;
		else if ( object.isLine ) return GPUPrimitiveTopology.LineStrip;
		else if ( object.isMesh ) return GPUPrimitiveTopology.TriangleList;

	}

	getSampleCount( sampleCount ) {

		let count = 1;

		if ( sampleCount > 1 ) {

			// WebGPU only supports power-of-two sample counts and 2 is not a valid value
			count = Math.pow( 2, Math.floor( Math.log2( sampleCount ) ) );

			if ( count === 2 ) {

				count = 4;

			}

		}

		return count;

	}

	getSampleCountRenderContext( renderContext ) {

		if ( renderContext.textures !== null ) {

			return this.getSampleCount( renderContext.sampleCount );

		}

		return this.getSampleCount( this.backend.renderer.samples );

	}

}

const typedArraysToVertexFormatPrefix = new Map( [
	[ Int8Array, [ 'sint8', 'snorm8' ]],
	[ Uint8Array, [ 'uint8', 'unorm8' ]],
	[ Int16Array, [ 'sint16', 'snorm16' ]],
	[ Uint16Array, [ 'uint16', 'unorm16' ]],
	[ Int32Array, [ 'sint32', 'snorm32' ]],
	[ Uint32Array, [ 'uint32', 'unorm32' ]],
	[ Float32Array, [ 'float32', ]],
] );

const typedAttributeToVertexFormatPrefix = new Map( [
	[ Float16BufferAttribute, [ 'float16', ]],
] );

const typeArraysToVertexFormatPrefixForItemSize1 = new Map( [
	[ Int32Array, 'sint32' ],
	[ Int16Array, 'sint32' ], // patch for INT16
	[ Uint32Array, 'uint32' ],
	[ Uint16Array, 'uint32' ], // patch for UINT16
	[ Float32Array, 'float32' ]
] );

class WebGPUAttributeUtils {

	constructor( backend ) {

		this.backend = backend;

	}

	createAttribute( attribute, usage ) {

		const bufferAttribute = this._getBufferAttribute( attribute );

		const backend = this.backend;
		const bufferData = backend.get( bufferAttribute );

		let buffer = bufferData.buffer;

		if ( buffer === undefined ) {

			const device = backend.device;

			let array = bufferAttribute.array;

			// patch for INT16 and UINT16
			if ( attribute.normalized === false && ( array.constructor === Int16Array || array.constructor === Uint16Array ) ) {

				const tempArray = new Uint32Array( array.length );
				for ( let i = 0; i < array.length; i ++ ) {

					tempArray[ i ] = array[ i ];

				}

				array = tempArray;

			}

			bufferAttribute.array = array;

			if ( ( bufferAttribute.isStorageBufferAttribute || bufferAttribute.isStorageInstancedBufferAttribute ) && bufferAttribute.itemSize === 3 ) {

				array = new array.constructor( bufferAttribute.count * 4 );

				for ( let i = 0; i < bufferAttribute.count; i ++ ) {

					array.set( bufferAttribute.array.subarray( i * 3, i * 3 + 3 ), i * 4 );

				}

				// Update BufferAttribute
				bufferAttribute.itemSize = 4;
				bufferAttribute.array = array;

			}

			const size = array.byteLength + ( ( 4 - ( array.byteLength % 4 ) ) % 4 ); // ensure 4 byte alignment, see #20441

			buffer = device.createBuffer( {
				label: bufferAttribute.name,
				size: size,
				usage: usage,
				mappedAtCreation: true
			} );

			new array.constructor( buffer.getMappedRange() ).set( array );

			buffer.unmap();

			bufferData.buffer = buffer;

		}

	}

	updateAttribute( attribute ) {

		const bufferAttribute = this._getBufferAttribute( attribute );

		const backend = this.backend;
		const device = backend.device;

		const buffer = backend.get( bufferAttribute ).buffer;

		const array = bufferAttribute.array;
		const updateRanges = bufferAttribute.updateRanges;

		if ( updateRanges.length === 0 ) {

			// Not using update ranges

			device.queue.writeBuffer(
				buffer,
				0,
				array,
				0
			);

		} else {

			for ( let i = 0, l = updateRanges.length; i < l; i ++ ) {

				const range = updateRanges[ i ];
				device.queue.writeBuffer(
					buffer,
					0,
					array,
					range.start * array.BYTES_PER_ELEMENT,
					range.count * array.BYTES_PER_ELEMENT
				);

			}

			bufferAttribute.clearUpdateRanges();

		}

	}

	createShaderVertexBuffers( renderObject ) {

		const attributes = renderObject.getAttributes();
		const vertexBuffers = new Map();

		for ( let slot = 0; slot < attributes.length; slot ++ ) {

			const geometryAttribute = attributes[ slot ];
			const bytesPerElement = geometryAttribute.array.BYTES_PER_ELEMENT;
			const bufferAttribute = this._getBufferAttribute( geometryAttribute );

			let vertexBufferLayout = vertexBuffers.get( bufferAttribute );

			if ( vertexBufferLayout === undefined ) {

				let arrayStride, stepMode;

				if ( geometryAttribute.isInterleavedBufferAttribute === true ) {

					arrayStride = geometryAttribute.data.stride * bytesPerElement;
					stepMode = geometryAttribute.data.isInstancedInterleavedBuffer ? GPUInputStepMode.Instance : GPUInputStepMode.Vertex;

				} else {

					arrayStride = geometryAttribute.itemSize * bytesPerElement;
					stepMode = geometryAttribute.isInstancedBufferAttribute ? GPUInputStepMode.Instance : GPUInputStepMode.Vertex;

				}

				// patch for INT16 and UINT16
				if ( geometryAttribute.normalized === false && ( geometryAttribute.array.constructor === Int16Array || geometryAttribute.array.constructor === Uint16Array ) ) {

					arrayStride = 4;

				}

				vertexBufferLayout = {
					arrayStride,
					attributes: [],
					stepMode
				};

				vertexBuffers.set( bufferAttribute, vertexBufferLayout );

			}

			const format = this._getVertexFormat( geometryAttribute );
			const offset = ( geometryAttribute.isInterleavedBufferAttribute === true ) ? geometryAttribute.offset * bytesPerElement : 0;

			vertexBufferLayout.attributes.push( {
				shaderLocation: slot,
				offset,
				format
			} );

		}

		return Array.from( vertexBuffers.values() );

	}

	destroyAttribute( attribute ) {

		const backend = this.backend;
		const data = backend.get( this._getBufferAttribute( attribute ) );

		data.buffer.destroy();

		backend.delete( attribute );

	}

	async getArrayBufferAsync( attribute ) {

		const backend = this.backend;
		const device = backend.device;

		const data = backend.get( this._getBufferAttribute( attribute ) );

		const bufferGPU = data.buffer;
		const size = bufferGPU.size;

		let readBufferGPU = data.readBuffer;
		let needsUnmap = true;

		if ( readBufferGPU === undefined ) {

			readBufferGPU = device.createBuffer( {
				label: attribute.name,
				size,
				usage: GPUBufferUsage.COPY_DST | GPUBufferUsage.MAP_READ
			} );

			needsUnmap = false;

			data.readBuffer = readBufferGPU;

		}

		const cmdEncoder = device.createCommandEncoder( {} );

		cmdEncoder.copyBufferToBuffer(
			bufferGPU,
			0,
			readBufferGPU,
			0,
			size
		);

		if ( needsUnmap ) readBufferGPU.unmap();

		const gpuCommands = cmdEncoder.finish();
		device.queue.submit( [ gpuCommands ] );

		await readBufferGPU.mapAsync( GPUMapMode.READ );

		const arrayBuffer = readBufferGPU.getMappedRange();

		return arrayBuffer;

	}

	_getVertexFormat( geometryAttribute ) {

		const { itemSize, normalized } = geometryAttribute;
		const ArrayType = geometryAttribute.array.constructor;
		const AttributeType = geometryAttribute.constructor;

		let format;

		if ( itemSize == 1 ) {

			format = typeArraysToVertexFormatPrefixForItemSize1.get( ArrayType );

		} else {

			const prefixOptions = typedAttributeToVertexFormatPrefix.get( AttributeType ) || typedArraysToVertexFormatPrefix.get( ArrayType );
			const prefix = prefixOptions[ normalized ? 1 : 0 ];

			if ( prefix ) {

				const bytesPerUnit = ArrayType.BYTES_PER_ELEMENT * itemSize;
				const paddedBytesPerUnit = Math.floor( ( bytesPerUnit + 3 ) / 4 ) * 4;
				const paddedItemSize = paddedBytesPerUnit / ArrayType.BYTES_PER_ELEMENT;

				if ( paddedItemSize % 1 ) {

					throw new Error( 'THREE.WebGPUAttributeUtils: Bad vertex format item size.' );

				}

				format = `${prefix}x${paddedItemSize}`;

			}

		}

		if ( ! format ) {

			console.error( 'THREE.WebGPUAttributeUtils: Vertex format not supported yet.' );

		}

		return format;

	}

	_getBufferAttribute( attribute ) {

		if ( attribute.isInterleavedBufferAttribute ) attribute = attribute.data;

		return attribute;

	}

}

class WebGPUBindingUtils {

	constructor( backend ) {

		this.backend = backend;

	}

	createBindingsLayout( bindGroup ) {

		const backend = this.backend;
		const device = backend.device;

		const entries = [];

		let index = 0;

		for ( const binding of bindGroup.bindings ) {

			const bindingGPU = {
				binding: index ++,
				visibility: binding.visibility
			};

			if ( binding.isUniformBuffer || binding.isStorageBuffer ) {

				const buffer = {}; // GPUBufferBindingLayout

				if ( binding.isStorageBuffer ) {

					buffer.type = binding.access;

				}

				bindingGPU.buffer = buffer;

			} else if ( binding.isSampler ) {

				const sampler = {}; // GPUSamplerBindingLayout

				if ( binding.texture.isDepthTexture ) {

					if ( binding.texture.compareFunction !== null ) {

						sampler.type = 'comparison';

					}

				}

				bindingGPU.sampler = sampler;

			} else if ( binding.isSampledTexture && binding.texture.isVideoTexture ) {

				bindingGPU.externalTexture = {}; // GPUExternalTextureBindingLayout

			} else if ( binding.isSampledTexture && binding.store ) {

				const format = this.backend.get( binding.texture ).texture.format;
				const access = binding.access;

				bindingGPU.storageTexture = { format, access }; // GPUStorageTextureBindingLayout

			} else if ( binding.isSampledTexture ) {

				const texture = {}; // GPUTextureBindingLayout

				if ( binding.texture.isMultisampleRenderTargetTexture === true ) {

					texture.multisampled = true;

				}

				if ( binding.texture.isDepthTexture ) {

					texture.sampleType = GPUTextureSampleType.Depth;

				} else if ( binding.texture.isDataTexture ) {

					const type = binding.texture.type;

					if ( type === IntType ) {

						texture.sampleType = GPUTextureSampleType.SInt;

					} else if ( type === UnsignedIntType ) {

						texture.sampleType = GPUTextureSampleType.UInt;

					} else if ( type === FloatType ) {

						// @TODO: Add support for this soon: backend.hasFeature( 'float32-filterable' )

						texture.sampleType = GPUTextureSampleType.UnfilterableFloat;

					}

				}

				if ( binding.isSampledCubeTexture ) {

					texture.viewDimension = GPUTextureViewDimension.Cube;

				} else if ( binding.texture.isDataArrayTexture ) {

					texture.viewDimension = GPUTextureViewDimension.TwoDArray;

				} else if ( binding.isSampledTexture3D ) {

					texture.viewDimension = GPUTextureViewDimension.ThreeD;

				}

				bindingGPU.texture = texture;

			} else {

				console.error( `WebGPUBindingUtils: Unsupported binding "${ binding }".` );

			}

			entries.push( bindingGPU );

		}

		return device.createBindGroupLayout( { entries } );

	}

	createBindings( bindGroup ) {

		const backend = this.backend;
		const bindingsData = backend.get( bindGroup );

		// setup (static) binding layout and (dynamic) binding group

		const bindLayoutGPU = this.createBindingsLayout( bindGroup );
		const bindGroupGPU = this.createBindGroup( bindGroup, bindLayoutGPU );

		bindingsData.layout = bindLayoutGPU;
		bindingsData.group = bindGroupGPU;

	}

	updateBinding( binding ) {

		const backend = this.backend;
		const device = backend.device;

		const buffer = binding.buffer;
		const bufferGPU = backend.get( binding ).buffer;

		device.queue.writeBuffer( bufferGPU, 0, buffer, 0 );

	}

	createBindGroup( bindGroup, layoutGPU ) {

		const backend = this.backend;
		const device = backend.device;

		let bindingPoint = 0;
		const entriesGPU = [];

		for ( const binding of bindGroup.bindings ) {

			if ( binding.isUniformBuffer ) {

				const bindingData = backend.get( binding );

				if ( bindingData.buffer === undefined ) {

					const byteLength = binding.byteLength;

					const usage = GPUBufferUsage.UNIFORM | GPUBufferUsage.COPY_DST;

					const bufferGPU = device.createBuffer( {
						label: 'bindingBuffer_' + binding.name,
						size: byteLength,
						usage: usage
					} );

					bindingData.buffer = bufferGPU;

				}

				entriesGPU.push( { binding: bindingPoint, resource: { buffer: bindingData.buffer } } );

			} else if ( binding.isStorageBuffer ) {

				const bindingData = backend.get( binding );

				if ( bindingData.buffer === undefined ) {

					const attribute = binding.attribute;
					//const usage = GPUBufferUsage.STORAGE | GPUBufferUsage.VERTEX | /*GPUBufferUsage.COPY_SRC |*/ GPUBufferUsage.COPY_DST;

					//backend.attributeUtils.createAttribute( attribute, usage ); // @TODO: Move it to universal renderer

					bindingData.buffer = backend.get( attribute ).buffer;

				}

				entriesGPU.push( { binding: bindingPoint, resource: { buffer: bindingData.buffer } } );

			} else if ( binding.isSampler ) {

				const textureGPU = backend.get( binding.texture );

				entriesGPU.push( { binding: bindingPoint, resource: textureGPU.sampler } );

			} else if ( binding.isSampledTexture ) {

				const textureData = backend.get( binding.texture );

				let dimensionViewGPU;

				if ( binding.isSampledCubeTexture ) {

					dimensionViewGPU = GPUTextureViewDimension.Cube;

				} else if ( binding.isSampledTexture3D ) {

					dimensionViewGPU = GPUTextureViewDimension.ThreeD;

				} else if ( binding.texture.isDataArrayTexture ) {

					dimensionViewGPU = GPUTextureViewDimension.TwoDArray;

				} else {

					dimensionViewGPU = GPUTextureViewDimension.TwoD;

				}

				let resourceGPU;

				if ( textureData.externalTexture !== undefined ) {

					resourceGPU = device.importExternalTexture( { source: textureData.externalTexture } );

				} else {

					const aspectGPU = GPUTextureAspect.All;

					resourceGPU = textureData.texture.createView( { aspect: aspectGPU, dimension: dimensionViewGPU, mipLevelCount: binding.store ? 1 : textureData.mipLevelCount } );

				}

				entriesGPU.push( { binding: bindingPoint, resource: resourceGPU } );

			}

			bindingPoint ++;

		}

		return device.createBindGroup( {
			label: 'bindGroup_' + bindGroup.name,
			layout: layoutGPU,
			entries: entriesGPU
		} );

	}

}

class WebGPUPipelineUtils {

	constructor( backend ) {

		this.backend = backend;

	}

	_getSampleCount( renderObjectContext ) {

		return this.backend.utils.getSampleCountRenderContext( renderObjectContext );

	}

	createRenderPipeline( renderObject, promises ) {

		const { object, material, geometry, pipeline } = renderObject;
		const { vertexProgram, fragmentProgram } = pipeline;

		const backend = this.backend;
		const device = backend.device;
		const utils = backend.utils;

		const pipelineData = backend.get( pipeline );

		// bind group layouts

		const bindGroupLayouts = [];

		for ( const bindGroup of renderObject.getBindings() ) {

			const bindingsData = backend.get( bindGroup );

			bindGroupLayouts.push( bindingsData.layout );

		}

		// vertex buffers

		const vertexBuffers = backend.attributeUtils.createShaderVertexBuffers( renderObject );

		// blending

		let blending;

		if ( material.transparent === true && material.blending !== NoBlending ) {

			blending = this._getBlending( material );

		}

		// stencil

		let stencilFront = {};

		if ( material.stencilWrite === true ) {

			stencilFront = {
				compare: this._getStencilCompare( material ),
				failOp: this._getStencilOperation( material.stencilFail ),
				depthFailOp: this._getStencilOperation( material.stencilZFail ),
				passOp: this._getStencilOperation( material.stencilZPass )
			};

		}

		const colorWriteMask = this._getColorWriteMask( material );

		const targets = [];

		if ( renderObject.context.textures !== null ) {

			const textures = renderObject.context.textures;

			for ( let i = 0; i < textures.length; i ++ ) {

				const colorFormat = utils.getTextureFormatGPU( textures[ i ] );

				targets.push( {
					format: colorFormat,
					blend: blending,
					writeMask: colorWriteMask
				} );

			}

		} else {

			const colorFormat = utils.getCurrentColorFormat( renderObject.context );

			targets.push( {
				format: colorFormat,
				blend: blending,
				writeMask: colorWriteMask
			} );

		}

		const vertexModule = backend.get( vertexProgram ).module;
		const fragmentModule = backend.get( fragmentProgram ).module;

		const primitiveState = this._getPrimitiveState( object, geometry, material );
		const depthCompare = this._getDepthCompare( material );
		const depthStencilFormat = utils.getCurrentDepthStencilFormat( renderObject.context );

		const sampleCount = this._getSampleCount( renderObject.context );

		const pipelineDescriptor = {
			label: 'renderPipeline',
			vertex: Object.assign( {}, vertexModule, { buffers: vertexBuffers } ),
			fragment: Object.assign( {}, fragmentModule, { targets } ),
			primitive: primitiveState,
			depthStencil: {
				format: depthStencilFormat,
				depthWriteEnabled: material.depthWrite,
				depthCompare: depthCompare,
				stencilFront: stencilFront,
				stencilBack: {}, // three.js does not provide an API to configure the back function (gl.stencilFuncSeparate() was never used)
				stencilReadMask: material.stencilFuncMask,
				stencilWriteMask: material.stencilWriteMask
			},
			multisample: {
				count: sampleCount,
				alphaToCoverageEnabled: material.alphaToCoverage
			},
			layout: device.createPipelineLayout( {
				bindGroupLayouts
			} )
		};

		if ( promises === null ) {

			pipelineData.pipeline = device.createRenderPipeline( pipelineDescriptor );

		} else {

			const p = new Promise( ( resolve /*, reject*/ ) => {

				device.createRenderPipelineAsync( pipelineDescriptor ).then( pipeline => {

					pipelineData.pipeline = pipeline;
					resolve();

				} );

			} );

			promises.push( p );

		}

	}

	createBundleEncoder( renderContext, renderObject ) {

		const backend = this.backend;
		const { utils, device } = backend;

		const renderContextData = backend.get( renderContext );
		const renderObjectData = backend.get( renderObject );

		const depthStencilFormat = utils.getCurrentDepthStencilFormat( renderContext );
		const colorFormat = utils.getCurrentColorFormat( renderContext );
		const sampleCount = this._getSampleCount( renderObject.context );

		const descriptor = {
			label: 'renderBundleEncoder',
			colorFormats: [ colorFormat ],
			depthStencilFormat,
			sampleCount
		};

		const bundleEncoder = device.createRenderBundleEncoder( descriptor );

		renderObjectData.bundleEncoder = bundleEncoder;
		renderContextData.currentSets = { attributes: {} };
		renderContextData._renderBundleViewport = renderContext.width + '_' + renderContext.height;

		return bundleEncoder;

	}

	createComputePipeline( pipeline, bindings ) {

		const backend = this.backend;
		const device = backend.device;

		const computeProgram = backend.get( pipeline.computeProgram ).module;

		const pipelineGPU = backend.get( pipeline );

		// bind group layouts

		const bindGroupLayouts = [];

		for ( const bindingsGroup of bindings ) {

			const bindingsData = backend.get( bindingsGroup );

			bindGroupLayouts.push( bindingsData.layout );

		}

		pipelineGPU.pipeline = device.createComputePipeline( {
			compute: computeProgram,
			layout: device.createPipelineLayout( {
				bindGroupLayouts
			} )
		} );

	}

	_getBlending( material ) {

		let color, alpha;

		const blending = material.blending;
		const blendSrc = material.blendSrc;
		const blendDst = material.blendDst;
		const blendEquation = material.blendEquation;


		if ( blending === CustomBlending ) {

			const blendSrcAlpha = material.blendSrcAlpha !== null ? material.blendSrcAlpha : blendSrc;
			const blendDstAlpha = material.blendDstAlpha !== null ? material.blendDstAlpha : blendDst;
			const blendEquationAlpha = material.blendEquationAlpha !== null ? material.blendEquationAlpha : blendEquation;

			color = {
				srcFactor: this._getBlendFactor( blendSrc ),
				dstFactor: this._getBlendFactor( blendDst ),
				operation: this._getBlendOperation( blendEquation )
			};

			alpha = {
				srcFactor: this._getBlendFactor( blendSrcAlpha ),
				dstFactor: this._getBlendFactor( blendDstAlpha ),
				operation: this._getBlendOperation( blendEquationAlpha )
			};

		} else {

			const premultipliedAlpha = material.premultipliedAlpha;

			const setBlend = ( srcRGB, dstRGB, srcAlpha, dstAlpha ) => {

				color = {
					srcFactor: srcRGB,
					dstFactor: dstRGB,
					operation: GPUBlendOperation.Add
				};

				alpha = {
					srcFactor: srcAlpha,
					dstFactor: dstAlpha,
					operation: GPUBlendOperation.Add
				};

			};

			if ( premultipliedAlpha ) {

				switch ( blending ) {

					case NormalBlending:
						setBlend( GPUBlendFactor.SrcAlpha, GPUBlendFactor.OneMinusSrcAlpha, GPUBlendFactor.One, GPUBlendFactor.OneMinusSrcAlpha );
						break;

					case AdditiveBlending:
						setBlend( GPUBlendFactor.SrcAlpha, GPUBlendFactor.One, GPUBlendFactor.One, GPUBlendFactor.One );
						break;

					case SubtractiveBlending:
						setBlend( GPUBlendFactor.Zero, GPUBlendFactor.OneMinusSrc, GPUBlendFactor.Zero, GPUBlendFactor.One );
						break;

					case MultiplyBlending:
						setBlend( GPUBlendFactor.Zero, GPUBlendFactor.Src, GPUBlendFactor.Zero, GPUBlendFactor.SrcAlpha );
						break;

				}

			} else {

				switch ( blending ) {

					case NormalBlending:
						setBlend( GPUBlendFactor.SrcAlpha, GPUBlendFactor.OneMinusSrcAlpha, GPUBlendFactor.One, GPUBlendFactor.OneMinusSrcAlpha );
						break;

					case AdditiveBlending:
						setBlend( GPUBlendFactor.SrcAlpha, GPUBlendFactor.One, GPUBlendFactor.SrcAlpha, GPUBlendFactor.One );
						break;

					case SubtractiveBlending:
						setBlend( GPUBlendFactor.Zero, GPUBlendFactor.OneMinusSrc, GPUBlendFactor.Zero, GPUBlendFactor.One );
						break;

					case MultiplyBlending:
						setBlend( GPUBlendFactor.Zero, GPUBlendFactor.Src, GPUBlendFactor.Zero, GPUBlendFactor.Src );
						break;

				}

			}

		}

		if ( color !== undefined && alpha !== undefined ) {

			return { color, alpha };

		} else {

			console.error( 'THREE.WebGPURenderer: Invalid blending: ', blending );

		}

	}

	_getBlendFactor( blend ) {

		let blendFactor;

		switch ( blend ) {

			case ZeroFactor:
				blendFactor = GPUBlendFactor.Zero;
				break;

			case OneFactor:
				blendFactor = GPUBlendFactor.One;
				break;

			case SrcColorFactor:
				blendFactor = GPUBlendFactor.Src;
				break;

			case OneMinusSrcColorFactor:
				blendFactor = GPUBlendFactor.OneMinusSrc;
				break;

			case SrcAlphaFactor:
				blendFactor = GPUBlendFactor.SrcAlpha;
				break;

			case OneMinusSrcAlphaFactor:
				blendFactor = GPUBlendFactor.OneMinusSrcAlpha;
				break;

			case DstColorFactor:
				blendFactor = GPUBlendFactor.Dst;
				break;

			case OneMinusDstColorFactor:
				blendFactor = GPUBlendFactor.OneMinusDstColor;
				break;

			case DstAlphaFactor:
				blendFactor = GPUBlendFactor.DstAlpha;
				break;

			case OneMinusDstAlphaFactor:
				blendFactor = GPUBlendFactor.OneMinusDstAlpha;
				break;

			case SrcAlphaSaturateFactor:
				blendFactor = GPUBlendFactor.SrcAlphaSaturated;
				break;

			case BlendColorFactor:
				blendFactor = GPUBlendFactor.Constant;
				break;

			case OneMinusBlendColorFactor:
				blendFactor = GPUBlendFactor.OneMinusConstant;
				break;

			default:
				console.error( 'THREE.WebGPURenderer: Blend factor not supported.', blend );

		}

		return blendFactor;

	}

	_getStencilCompare( material ) {

		let stencilCompare;

		const stencilFunc = material.stencilFunc;

		switch ( stencilFunc ) {

			case NeverStencilFunc:
				stencilCompare = GPUCompareFunction.Never;
				break;

			case AlwaysStencilFunc:
				stencilCompare = GPUCompareFunction.Always;
				break;

			case LessStencilFunc:
				stencilCompare = GPUCompareFunction.Less;
				break;

			case LessEqualStencilFunc:
				stencilCompare = GPUCompareFunction.LessEqual;
				break;

			case EqualStencilFunc:
				stencilCompare = GPUCompareFunction.Equal;
				break;

			case GreaterEqualStencilFunc:
				stencilCompare = GPUCompareFunction.GreaterEqual;
				break;

			case GreaterStencilFunc:
				stencilCompare = GPUCompareFunction.Greater;
				break;

			case NotEqualStencilFunc:
				stencilCompare = GPUCompareFunction.NotEqual;
				break;

			default:
				console.error( 'THREE.WebGPURenderer: Invalid stencil function.', stencilFunc );

		}

		return stencilCompare;

	}

	_getStencilOperation( op ) {

		let stencilOperation;

		switch ( op ) {

			case KeepStencilOp:
				stencilOperation = GPUStencilOperation.Keep;
				break;

			case ZeroStencilOp:
				stencilOperation = GPUStencilOperation.Zero;
				break;

			case ReplaceStencilOp:
				stencilOperation = GPUStencilOperation.Replace;
				break;

			case InvertStencilOp:
				stencilOperation = GPUStencilOperation.Invert;
				break;

			case IncrementStencilOp:
				stencilOperation = GPUStencilOperation.IncrementClamp;
				break;

			case DecrementStencilOp:
				stencilOperation = GPUStencilOperation.DecrementClamp;
				break;

			case IncrementWrapStencilOp:
				stencilOperation = GPUStencilOperation.IncrementWrap;
				break;

			case DecrementWrapStencilOp:
				stencilOperation = GPUStencilOperation.DecrementWrap;
				break;

			default:
				console.error( 'THREE.WebGPURenderer: Invalid stencil operation.', stencilOperation );

		}

		return stencilOperation;

	}

	_getBlendOperation( blendEquation ) {

		let blendOperation;

		switch ( blendEquation ) {

			case AddEquation:
				blendOperation = GPUBlendOperation.Add;
				break;

			case SubtractEquation:
				blendOperation = GPUBlendOperation.Subtract;
				break;

			case ReverseSubtractEquation:
				blendOperation = GPUBlendOperation.ReverseSubtract;
				break;

			case MinEquation:
				blendOperation = GPUBlendOperation.Min;
				break;

			case MaxEquation:
				blendOperation = GPUBlendOperation.Max;
				break;

			default:
				console.error( 'THREE.WebGPUPipelineUtils: Blend equation not supported.', blendEquation );

		}

		return blendOperation;

	}

	_getPrimitiveState( object, geometry, material ) {

		const descriptor = {};
		const utils = this.backend.utils;

		descriptor.topology = utils.getPrimitiveTopology( object, material );

		if ( geometry.index !== null && object.isLine === true && object.isLineSegments !== true ) {

			descriptor.stripIndexFormat = ( geometry.index.array instanceof Uint16Array ) ? GPUIndexFormat.Uint16 : GPUIndexFormat.Uint32;

		}

		switch ( material.side ) {

			case FrontSide:
				descriptor.frontFace = GPUFrontFace.CCW;
				descriptor.cullMode = GPUCullMode.Back;
				break;

			case BackSide:
				descriptor.frontFace = GPUFrontFace.CCW;
				descriptor.cullMode = GPUCullMode.Front;
				break;

			case DoubleSide:
				descriptor.frontFace = GPUFrontFace.CCW;
				descriptor.cullMode = GPUCullMode.None;
				break;

			default:
				console.error( 'THREE.WebGPUPipelineUtils: Unknown material.side value.', material.side );
				break;

		}

		return descriptor;

	}

	_getColorWriteMask( material ) {

		return ( material.colorWrite === true ) ? GPUColorWriteFlags.All : GPUColorWriteFlags.None;

	}

	_getDepthCompare( material ) {

		let depthCompare;

		if ( material.depthTest === false ) {

			depthCompare = GPUCompareFunction.Always;

		} else {

			const depthFunc = material.depthFunc;

			switch ( depthFunc ) {

				case NeverDepth:
					depthCompare = GPUCompareFunction.Never;
					break;

				case AlwaysDepth:
					depthCompare = GPUCompareFunction.Always;
					break;

				case LessDepth:
					depthCompare = GPUCompareFunction.Less;
					break;

				case LessEqualDepth:
					depthCompare = GPUCompareFunction.LessEqual;
					break;

				case EqualDepth:
					depthCompare = GPUCompareFunction.Equal;
					break;

				case GreaterEqualDepth:
					depthCompare = GPUCompareFunction.GreaterEqual;
					break;

				case GreaterDepth:
					depthCompare = GPUCompareFunction.Greater;
					break;

				case NotEqualDepth:
					depthCompare = GPUCompareFunction.NotEqual;
					break;

				default:
					console.error( 'THREE.WebGPUPipelineUtils: Invalid depth function.', depthFunc );

			}

		}

		return depthCompare;

	}

}

/*// debugger tools
import 'https://greggman.github.io/webgpu-avoid-redundant-state-setting/webgpu-check-redundant-state-setting.js';
//*/


//

class WebGPUBackend extends Backend {

	constructor( parameters = {} ) {

		super( parameters );

		this.isWebGPUBackend = true;

		// some parameters require default values other than "undefined"
		this.parameters.alpha = ( parameters.alpha === undefined ) ? true : parameters.alpha;

		this.parameters.requiredLimits = ( parameters.requiredLimits === undefined ) ? {} : parameters.requiredLimits;

		this.trackTimestamp = ( parameters.trackTimestamp === true );

		this.device = null;
		this.context = null;
		this.colorBuffer = null;
		this.defaultRenderPassdescriptor = null;

		this.utils = new WebGPUUtils( this );
		this.attributeUtils = new WebGPUAttributeUtils( this );
		this.bindingUtils = new WebGPUBindingUtils( this );
		this.pipelineUtils = new WebGPUPipelineUtils( this );
		this.textureUtils = new WebGPUTextureUtils( this );
		this.occludedResolveCache = new Map();

	}

	async init( renderer ) {

		await super.init( renderer );

		//

		const parameters = this.parameters;

		// create the device if it is not passed with parameters

		let device;

		if ( parameters.device === undefined ) {

			const adapterOptions = {
				powerPreference: parameters.powerPreference
			};

			const adapter = await navigator.gpu.requestAdapter( adapterOptions );

			if ( adapter === null ) {

				throw new Error( 'WebGPUBackend: Unable to create WebGPU adapter.' );

			}

			// feature support

			const features = Object.values( GPUFeatureName );

			const supportedFeatures = [];

			for ( const name of features ) {

				if ( adapter.features.has( name ) ) {

					supportedFeatures.push( name );

				}

			}

			const deviceDescriptor = {
				requiredFeatures: supportedFeatures,
				requiredLimits: parameters.requiredLimits
			};

			device = await adapter.requestDevice( deviceDescriptor );

		} else {

			device = parameters.device;

		}

		const context = ( parameters.context !== undefined ) ? parameters.context : renderer.domElement.getContext( 'webgpu' );

		this.device = device;
		this.context = context;

		const alphaMode = parameters.alpha ? 'premultiplied' : 'opaque';

		this.context.configure( {
			device: this.device,
			format: GPUTextureFormat.BGRA8Unorm,
			usage: GPUTextureUsage.RENDER_ATTACHMENT | GPUTextureUsage.COPY_SRC,
			alphaMode: alphaMode
		} );

		this.updateSize();

	}

	get coordinateSystem() {

		return WebGPUCoordinateSystem;

	}

	async getArrayBufferAsync( attribute ) {

		return await this.attributeUtils.getArrayBufferAsync( attribute );

	}

	getContext() {

		return this.context;

	}

	_getDefaultRenderPassDescriptor() {

		let descriptor = this.defaultRenderPassdescriptor;

		if ( descriptor === null ) {

			const renderer = this.renderer;

			descriptor = {
				colorAttachments: [ {
					view: null
				} ],
				depthStencilAttachment: {
					view: this.textureUtils.getDepthBuffer( renderer.depth, renderer.stencil ).createView()
				}
			};

			const colorAttachment = descriptor.colorAttachments[ 0 ];

			if ( this.renderer.samples > 0 ) {

				colorAttachment.view = this.colorBuffer.createView();

			} else {

				colorAttachment.resolveTarget = undefined;

			}

			this.defaultRenderPassdescriptor = descriptor;

		}

		const colorAttachment = descriptor.colorAttachments[ 0 ];

		if ( this.renderer.samples > 0 ) {

			colorAttachment.resolveTarget = this.context.getCurrentTexture().createView();

		} else {

			colorAttachment.view = this.context.getCurrentTexture().createView();

		}

		return descriptor;

	}

	_getRenderPassDescriptor( renderContext ) {

		const renderTarget = renderContext.renderTarget;
		const renderTargetData = this.get( renderTarget );

		let descriptors = renderTargetData.descriptors;

		if ( descriptors === undefined ) {

			descriptors = [];

			renderTargetData.descriptors = descriptors;

		}

		if ( renderTargetData.width !== renderTarget.width ||
			renderTargetData.height !== renderTarget.height ||
			renderTargetData.activeMipmapLevel !== renderTarget.activeMipmapLevel ||
			renderTargetData.samples !== renderTarget.samples
		) {

			descriptors.length = 0;

		}

		let descriptor = descriptors[ renderContext.activeCubeFace ];

		if ( descriptor === undefined ) {

			const textures = renderContext.textures;
			const colorAttachments = [];

			for ( let i = 0; i < textures.length; i ++ ) {

				const textureData = this.get( textures[ i ] );

				const textureView = textureData.texture.createView( {
					baseMipLevel: renderContext.activeMipmapLevel,
					mipLevelCount: 1,
					baseArrayLayer: renderContext.activeCubeFace,
					dimension: GPUTextureViewDimension.TwoD
				} );

				let view, resolveTarget;

				if ( textureData.msaaTexture !== undefined ) {

					view = textureData.msaaTexture.createView();
					resolveTarget = textureView;

				} else {

					view = textureView;
					resolveTarget = undefined;

				}

				colorAttachments.push( {
					view,
					resolveTarget,
					loadOp: GPULoadOp.Load,
					storeOp: GPUStoreOp.Store
				} );

			}

			const depthTextureData = this.get( renderContext.depthTexture );

			const depthStencilAttachment = {
				view: depthTextureData.texture.createView()
			};

			descriptor = {
				colorAttachments,
				depthStencilAttachment
			};

			descriptors[ renderContext.activeCubeFace ] = descriptor;

			renderTargetData.width = renderTarget.width;
			renderTargetData.height = renderTarget.height;
			renderTargetData.samples = renderTarget.samples;
			renderTargetData.activeMipmapLevel = renderTarget.activeMipmapLevel;

		}

		return descriptor;

	}

	beginRender( renderContext ) {

		const renderContextData = this.get( renderContext );

		const device = this.device;
		const occlusionQueryCount = renderContext.occlusionQueryCount;

		let occlusionQuerySet;

		if ( occlusionQueryCount > 0 ) {

			if ( renderContextData.currentOcclusionQuerySet ) renderContextData.currentOcclusionQuerySet.destroy();
			if ( renderContextData.currentOcclusionQueryBuffer ) renderContextData.currentOcclusionQueryBuffer.destroy();

			// Get a reference to the array of objects with queries. The renderContextData property
			// can be changed by another render pass before the buffer.mapAsyc() completes.
			renderContextData.currentOcclusionQuerySet = renderContextData.occlusionQuerySet;
			renderContextData.currentOcclusionQueryBuffer = renderContextData.occlusionQueryBuffer;
			renderContextData.currentOcclusionQueryObjects = renderContextData.occlusionQueryObjects;

			//

			occlusionQuerySet = device.createQuerySet( { type: 'occlusion', count: occlusionQueryCount } );

			renderContextData.occlusionQuerySet = occlusionQuerySet;
			renderContextData.occlusionQueryIndex = 0;
			renderContextData.occlusionQueryObjects = new Array( occlusionQueryCount );

			renderContextData.lastOcclusionObject = null;

		}

		let descriptor;

		if ( renderContext.textures === null ) {

			descriptor = this._getDefaultRenderPassDescriptor();

		} else {

			descriptor = this._getRenderPassDescriptor( renderContext );

		}

		this.initTimestampQuery( renderContext, descriptor );

		descriptor.occlusionQuerySet = occlusionQuerySet;

		const depthStencilAttachment = descriptor.depthStencilAttachment;

		if ( renderContext.textures !== null ) {

			const colorAttachments = descriptor.colorAttachments;

			for ( let i = 0; i < colorAttachments.length; i ++ ) {

				const colorAttachment = colorAttachments[ i ];

				if ( renderContext.clearColor ) {

					colorAttachment.clearValue = renderContext.clearColorValue;
					colorAttachment.loadOp = GPULoadOp.Clear;
					colorAttachment.storeOp = GPUStoreOp.Store;

				} else {

					colorAttachment.loadOp = GPULoadOp.Load;
					colorAttachment.storeOp = GPUStoreOp.Store;

				}

			}

		} else {

			const colorAttachment = descriptor.colorAttachments[ 0 ];

			if ( renderContext.clearColor ) {

				colorAttachment.clearValue = renderContext.clearColorValue;
				colorAttachment.loadOp = GPULoadOp.Clear;
				colorAttachment.storeOp = GPUStoreOp.Store;

			} else {

				colorAttachment.loadOp = GPULoadOp.Load;
				colorAttachment.storeOp = GPUStoreOp.Store;

			}

		}

		//

		if ( renderContext.depth ) {

			if ( renderContext.clearDepth ) {

				depthStencilAttachment.depthClearValue = renderContext.clearDepthValue;
				depthStencilAttachment.depthLoadOp = GPULoadOp.Clear;
				depthStencilAttachment.depthStoreOp = GPUStoreOp.Store;

			} else {

				depthStencilAttachment.depthLoadOp = GPULoadOp.Load;
				depthStencilAttachment.depthStoreOp = GPUStoreOp.Store;

			}

		}

		if ( renderContext.stencil ) {

			if ( renderContext.clearStencil ) {

				depthStencilAttachment.stencilClearValue = renderContext.clearStencilValue;
				depthStencilAttachment.stencilLoadOp = GPULoadOp.Clear;
				depthStencilAttachment.stencilStoreOp = GPUStoreOp.Store;

			} else {

				depthStencilAttachment.stencilLoadOp = GPULoadOp.Load;
				depthStencilAttachment.stencilStoreOp = GPUStoreOp.Store;

			}

		}

		//

		const encoder = device.createCommandEncoder( { label: 'renderContext_' + renderContext.id } );
		const currentPass = encoder.beginRenderPass( descriptor );

		//

		renderContextData.descriptor = descriptor;
		renderContextData.encoder = encoder;
		renderContextData.currentPass = currentPass;
		renderContextData.currentSets = { attributes: {} };

		//

		if ( renderContext.viewport ) {

			this.updateViewport( renderContext );

		}

		if ( renderContext.scissor ) {

			const { x, y, width, height } = renderContext.scissorValue;

			currentPass.setScissorRect( x, renderContext.height - height - y, width, height );

		}

	}

	finishRender( renderContext ) {

		const renderContextData = this.get( renderContext );
		const occlusionQueryCount = renderContext.occlusionQueryCount;

		if ( renderContextData.renderBundles !== undefined && renderContextData.renderBundles.length > 0 ) {

			renderContextData.registerBundlesPhase = false;
			renderContextData.currentPass.executeBundles( renderContextData.renderBundles );

		}

		if ( occlusionQueryCount > renderContextData.occlusionQueryIndex ) {

			renderContextData.currentPass.endOcclusionQuery();

		}

		renderContextData.currentPass.end();

		if ( occlusionQueryCount > 0 ) {

			const bufferSize = occlusionQueryCount * 8; // 8 byte entries for query results

			//

			let queryResolveBuffer = this.occludedResolveCache.get( bufferSize );

			if ( queryResolveBuffer === undefined ) {

				queryResolveBuffer = this.device.createBuffer(
					{
						size: bufferSize,
						usage: GPUBufferUsage.QUERY_RESOLVE | GPUBufferUsage.COPY_SRC
					}
				);

				this.occludedResolveCache.set( bufferSize, queryResolveBuffer );

			}

			//

			const readBuffer = this.device.createBuffer(
				{
					size: bufferSize,
					usage: GPUBufferUsage.COPY_DST | GPUBufferUsage.MAP_READ
				}
			);

			// two buffers required here - WebGPU doesn't allow usage of QUERY_RESOLVE & MAP_READ to be combined
			renderContextData.encoder.resolveQuerySet( renderContextData.occlusionQuerySet, 0, occlusionQueryCount, queryResolveBuffer, 0 );
			renderContextData.encoder.copyBufferToBuffer( queryResolveBuffer, 0, readBuffer, 0, bufferSize );

			renderContextData.occlusionQueryBuffer = readBuffer;

			//

			this.resolveOccludedAsync( renderContext );

		}

		this.prepareTimestampBuffer( renderContext, renderContextData.encoder );

		this.device.queue.submit( [ renderContextData.encoder.finish() ] );


		//

		if ( renderContext.textures !== null ) {

			const textures = renderContext.textures;

			for ( let i = 0; i < textures.length; i ++ ) {

				const texture = textures[ i ];

				if ( texture.generateMipmaps === true ) {

					this.textureUtils.generateMipmaps( texture );

				}

			}

		}

	}

	isOccluded( renderContext, object ) {

		const renderContextData = this.get( renderContext );

		return renderContextData.occluded && renderContextData.occluded.has( object );

	}

	async resolveOccludedAsync( renderContext ) {

		const renderContextData = this.get( renderContext );

		// handle occlusion query results

		const { currentOcclusionQueryBuffer, currentOcclusionQueryObjects } = renderContextData;

		if ( currentOcclusionQueryBuffer && currentOcclusionQueryObjects ) {

			const occluded = new WeakSet();

			renderContextData.currentOcclusionQueryObjects = null;
			renderContextData.currentOcclusionQueryBuffer = null;

			await currentOcclusionQueryBuffer.mapAsync( GPUMapMode.READ );

			const buffer = currentOcclusionQueryBuffer.getMappedRange();
			const results = new BigUint64Array( buffer );

			for ( let i = 0; i < currentOcclusionQueryObjects.length; i ++ ) {

				if ( results[ i ] !== BigInt( 0 ) ) {

					occluded.add( currentOcclusionQueryObjects[ i ] );

				}

			}

			currentOcclusionQueryBuffer.destroy();

			renderContextData.occluded = occluded;

		}

	}

	updateViewport( renderContext ) {

		const { currentPass } = this.get( renderContext );
		const { x, y, width, height, minDepth, maxDepth } = renderContext.viewportValue;

		currentPass.setViewport( x, renderContext.height - height - y, width, height, minDepth, maxDepth );

	}

	clear( color, depth, stencil, renderTargetData = null ) {

		const device = this.device;
		const renderer = this.renderer;

		let colorAttachments = [];

		let depthStencilAttachment;
		let clearValue;

		let supportsDepth;
		let supportsStencil;

		if ( color ) {

			const clearColor = this.getClearColor();

			clearValue = { r: clearColor.r, g: clearColor.g, b: clearColor.b, a: clearColor.a };

		}

		if ( renderTargetData === null ) {

			supportsDepth = renderer.depth;
			supportsStencil = renderer.stencil;

			const descriptor = this._getDefaultRenderPassDescriptor();

			if ( color ) {

				colorAttachments = descriptor.colorAttachments;

				const colorAttachment = colorAttachments[ 0 ];

				colorAttachment.clearValue = clearValue;
				colorAttachment.loadOp = GPULoadOp.Clear;
				colorAttachment.storeOp = GPUStoreOp.Store;

			}

			if ( supportsDepth || supportsStencil ) {

				depthStencilAttachment = descriptor.depthStencilAttachment;

			}

		} else {

			supportsDepth = renderTargetData.depth;
			supportsStencil = renderTargetData.stencil;

			if ( color ) {

				for ( const texture of renderTargetData.textures ) {

					const textureData = this.get( texture );
					const textureView = textureData.texture.createView();

					let view, resolveTarget;

					if ( textureData.msaaTexture !== undefined ) {

						view = textureData.msaaTexture.createView();
						resolveTarget = textureView;

					} else {

						view = textureView;
						resolveTarget = undefined;

					}

					colorAttachments.push( {
						view,
						resolveTarget,
						clearValue,
						loadOp: GPULoadOp.Clear,
						storeOp: GPUStoreOp.Store
					} );

				}

			}

			if ( supportsDepth || supportsStencil ) {

				const depthTextureData = this.get( renderTargetData.depthTexture );

				depthStencilAttachment = {
					view: depthTextureData.texture.createView()
				};

			}

		}

		//

		if ( supportsDepth ) {

			if ( depth ) {

				depthStencilAttachment.depthLoadOp = GPULoadOp.Clear;
				depthStencilAttachment.depthClearValue = renderer.getClearDepth();
				depthStencilAttachment.depthStoreOp = GPUStoreOp.Store;

			} else {

				depthStencilAttachment.depthLoadOp = GPULoadOp.Load;
				depthStencilAttachment.depthStoreOp = GPUStoreOp.Store;

			}

		}

		//

		if ( supportsStencil ) {

			if ( stencil ) {

				depthStencilAttachment.stencilLoadOp = GPULoadOp.Clear;
				depthStencilAttachment.stencilClearValue = renderer.getClearStencil();
				depthStencilAttachment.stencilStoreOp = GPUStoreOp.Store;

			} else {

				depthStencilAttachment.stencilLoadOp = GPULoadOp.Load;
				depthStencilAttachment.stencilStoreOp = GPUStoreOp.Store;

			}

		}

		//

		const encoder = device.createCommandEncoder( {} );
		const currentPass = encoder.beginRenderPass( {
			colorAttachments,
			depthStencilAttachment
		} );

		currentPass.end();

		device.queue.submit( [ encoder.finish() ] );

	}

	// compute

	beginCompute( computeGroup ) {

		const groupGPU = this.get( computeGroup );


		const descriptor = {};

		this.initTimestampQuery( computeGroup, descriptor );

		groupGPU.cmdEncoderGPU = this.device.createCommandEncoder();

		groupGPU.passEncoderGPU = groupGPU.cmdEncoderGPU.beginComputePass( descriptor );

	}

	compute( computeGroup, computeNode, bindings, pipeline ) {

		const { passEncoderGPU } = this.get( computeGroup );

		// pipeline

		const pipelineGPU = this.get( pipeline ).pipeline;
		passEncoderGPU.setPipeline( pipelineGPU );

		// bind groups

		for ( let i = 0, l = bindings.length; i < l; i ++ ) {

			const bindGroup = bindings[ i ];
			const bindingsData = this.get( bindGroup );

			passEncoderGPU.setBindGroup( i, bindingsData.group );

		}

		passEncoderGPU.dispatchWorkgroups( computeNode.dispatchCount );

	}

	finishCompute( computeGroup ) {

		const groupData = this.get( computeGroup );

		groupData.passEncoderGPU.end();

		this.prepareTimestampBuffer( computeGroup, groupData.cmdEncoderGPU );

		this.device.queue.submit( [ groupData.cmdEncoderGPU.finish() ] );

	}

	// render object

	draw( renderObject, info ) {

		const { object, geometry, context, pipeline } = renderObject;

		const bindings = renderObject.getBindings();
		const contextData = this.get( context );
		const pipelineGPU = this.get( pipeline ).pipeline;
		const currentSets = contextData.currentSets;

		const renderObjectData = this.get( renderObject );

		const { bundleEncoder, renderBundle, lastPipelineGPU } = renderObjectData;

		const renderContextData = this.get( context );

		if ( renderContextData.registerBundlesPhase === true && bundleEncoder !== undefined && lastPipelineGPU === pipelineGPU ) {

			renderContextData.renderBundles.push( renderBundle );
			return;

		}

		const passEncoderGPU = this.renderer._currentRenderBundle ? this.createBundleEncoder( context, renderObject ) : contextData.currentPass;

		// pipeline

		if ( currentSets.pipeline !== pipelineGPU ) {

			passEncoderGPU.setPipeline( pipelineGPU );

			currentSets.pipeline = pipelineGPU;

		}

		// bind groups

		for ( let i = 0, l = bindings.length; i < l; i ++ ) {

			const bindGroup = bindings[ i ];
			const bindingsData = this.get( bindGroup );

			passEncoderGPU.setBindGroup( i, bindingsData.group );

		}

		// attributes

		const index = renderObject.getIndex();

		const hasIndex = ( index !== null );

		// index

		if ( hasIndex === true ) {

			if ( currentSets.index !== index ) {

				const buffer = this.get( index ).buffer;
				const indexFormat = ( index.array instanceof Uint16Array ) ? GPUIndexFormat.Uint16 : GPUIndexFormat.Uint32;

				passEncoderGPU.setIndexBuffer( buffer, indexFormat );

				currentSets.index = index;

			}

		}

		// vertex buffers

		const vertexBuffers = renderObject.getVertexBuffers();

		for ( let i = 0, l = vertexBuffers.length; i < l; i ++ ) {

			const vertexBuffer = vertexBuffers[ i ];

			if ( currentSets.attributes[ i ] !== vertexBuffer ) {

				const buffer = this.get( vertexBuffer ).buffer;
				passEncoderGPU.setVertexBuffer( i, buffer );

				currentSets.attributes[ i ] = vertexBuffer;

			}

		}

		// occlusion queries - handle multiple consecutive draw calls for an object

		if ( contextData.occlusionQuerySet !== undefined ) {

			const lastObject = contextData.lastOcclusionObject;

			if ( lastObject !== object ) {

				if ( lastObject !== null && lastObject.occlusionTest === true ) {

					passEncoderGPU.endOcclusionQuery();
					contextData.occlusionQueryIndex ++;

				}

				if ( object.occlusionTest === true ) {

					passEncoderGPU.beginOcclusionQuery( contextData.occlusionQueryIndex );
					contextData.occlusionQueryObjects[ contextData.occlusionQueryIndex ] = object;

				}

				contextData.lastOcclusionObject = object;

			}

		}

		// draw

		const drawRange = renderObject.drawRange;
		const firstVertex = drawRange.start;

		const instanceCount = this.getInstanceCount( renderObject );
		if ( instanceCount === 0 ) return;

		if ( object.isBatchedMesh === true ) {

			const starts = object._multiDrawStarts;
			const counts = object._multiDrawCounts;
			const drawCount = object._multiDrawCount;
			const drawInstances = object._multiDrawInstances;

			const bytesPerElement = index.bytesPerElement || 1;

			for ( let i = 0; i < drawCount; i ++ ) {

				const count = drawInstances ? drawInstances[ i ] : 1;
				const firstInstance = count > 1 ? 0 : i;

				passEncoderGPU.drawIndexed( counts[ i ] / bytesPerElement, count, starts[ i ] / 4, 0, firstInstance );

			}

		} else if ( hasIndex === true ) {

			const indexCount = ( drawRange.count !== Infinity ) ? drawRange.count : index.count;

			passEncoderGPU.drawIndexed( indexCount, instanceCount, firstVertex, 0, 0 );

			info.update( object, indexCount, instanceCount );

		} else {

			const positionAttribute = geometry.attributes.position;
			const vertexCount = ( drawRange.count !== Infinity ) ? drawRange.count : positionAttribute.count;

			passEncoderGPU.draw( vertexCount, instanceCount, firstVertex, 0 );

			info.update( object, vertexCount, instanceCount );

		}

		if ( this.renderer._currentRenderBundle ) {

			const renderBundle = passEncoderGPU.finish();
			renderObjectData.lastPipelineGPU = pipelineGPU;
			renderObjectData.renderBundle = renderBundle;
			renderObjectData.bundleEncoder = passEncoderGPU;

		}

	}

	// cache key

	needsRenderUpdate( renderObject ) {

		const data = this.get( renderObject );

		const { object, material } = renderObject;

		const utils = this.utils;

		const sampleCount = utils.getSampleCountRenderContext( renderObject.context );
		const colorSpace = utils.getCurrentColorSpace( renderObject.context );
		const colorFormat = utils.getCurrentColorFormat( renderObject.context );
		const depthStencilFormat = utils.getCurrentDepthStencilFormat( renderObject.context );
		const primitiveTopology = utils.getPrimitiveTopology( object, material );

		let needsUpdate = false;

		if ( data.material !== material || data.materialVersion !== material.version ||
			data.transparent !== material.transparent || data.blending !== material.blending || data.premultipliedAlpha !== material.premultipliedAlpha ||
			data.blendSrc !== material.blendSrc || data.blendDst !== material.blendDst || data.blendEquation !== material.blendEquation ||
			data.blendSrcAlpha !== material.blendSrcAlpha || data.blendDstAlpha !== material.blendDstAlpha || data.blendEquationAlpha !== material.blendEquationAlpha ||
			data.colorWrite !== material.colorWrite || data.depthWrite !== material.depthWrite || data.depthTest !== material.depthTest || data.depthFunc !== material.depthFunc ||
			data.stencilWrite !== material.stencilWrite || data.stencilFunc !== material.stencilFunc ||
			data.stencilFail !== material.stencilFail || data.stencilZFail !== material.stencilZFail || data.stencilZPass !== material.stencilZPass ||
			data.stencilFuncMask !== material.stencilFuncMask || data.stencilWriteMask !== material.stencilWriteMask ||
			data.side !== material.side || data.alphaToCoverage !== material.alphaToCoverage ||
			data.sampleCount !== sampleCount || data.colorSpace !== colorSpace ||
			data.colorFormat !== colorFormat || data.depthStencilFormat !== depthStencilFormat ||
			data.primitiveTopology !== primitiveTopology ||
			data.clippingContextVersion !== renderObject.clippingContextVersion
		) {

			data.material = material; data.materialVersion = material.version;
			data.transparent = material.transparent; data.blending = material.blending; data.premultipliedAlpha = material.premultipliedAlpha;
			data.blendSrc = material.blendSrc; data.blendDst = material.blendDst; data.blendEquation = material.blendEquation;
			data.blendSrcAlpha = material.blendSrcAlpha; data.blendDstAlpha = material.blendDstAlpha; data.blendEquationAlpha = material.blendEquationAlpha;
			data.colorWrite = material.colorWrite;
			data.depthWrite = material.depthWrite; data.depthTest = material.depthTest; data.depthFunc = material.depthFunc;
			data.stencilWrite = material.stencilWrite; data.stencilFunc = material.stencilFunc;
			data.stencilFail = material.stencilFail; data.stencilZFail = material.stencilZFail; data.stencilZPass = material.stencilZPass;
			data.stencilFuncMask = material.stencilFuncMask; data.stencilWriteMask = material.stencilWriteMask;
			data.side = material.side; data.alphaToCoverage = material.alphaToCoverage;
			data.sampleCount = sampleCount;
			data.colorSpace = colorSpace;
			data.colorFormat = colorFormat;
			data.depthStencilFormat = depthStencilFormat;
			data.primitiveTopology = primitiveTopology;
			data.clippingContextVersion = renderObject.clippingContextVersion;

			needsUpdate = true;

		}

		return needsUpdate;

	}

	getRenderCacheKey( renderObject ) {

		const { object, material } = renderObject;

		const utils = this.utils;
		const renderContext = renderObject.context;

		return [
			material.transparent, material.blending, material.premultipliedAlpha,
			material.blendSrc, material.blendDst, material.blendEquation,
			material.blendSrcAlpha, material.blendDstAlpha, material.blendEquationAlpha,
			material.colorWrite,
			material.depthWrite, material.depthTest, material.depthFunc,
			material.stencilWrite, material.stencilFunc,
			material.stencilFail, material.stencilZFail, material.stencilZPass,
			material.stencilFuncMask, material.stencilWriteMask,
			material.side,
			utils.getSampleCountRenderContext( renderContext ),
			utils.getCurrentColorSpace( renderContext ), utils.getCurrentColorFormat( renderContext ), utils.getCurrentDepthStencilFormat( renderContext ),
			utils.getPrimitiveTopology( object, material ),
			renderObject.clippingContextVersion
		].join();

	}

	// textures

	createSampler( texture ) {

		this.textureUtils.createSampler( texture );

	}

	destroySampler( texture ) {

		this.textureUtils.destroySampler( texture );

	}

	createDefaultTexture( texture ) {

		this.textureUtils.createDefaultTexture( texture );

	}

	createTexture( texture, options ) {

		this.textureUtils.createTexture( texture, options );

	}

	updateTexture( texture, options ) {

		this.textureUtils.updateTexture( texture, options );

	}

	generateMipmaps( texture ) {

		this.textureUtils.generateMipmaps( texture );

	}

	destroyTexture( texture ) {

		this.textureUtils.destroyTexture( texture );

	}

	copyTextureToBuffer( texture, x, y, width, height ) {

		return this.textureUtils.copyTextureToBuffer( texture, x, y, width, height );

	}


	initTimestampQuery( renderContext, descriptor ) {

		if ( ! this.hasFeature( GPUFeatureName.TimestampQuery ) || ! this.trackTimestamp ) return;

		const renderContextData = this.get( renderContext );

		if ( ! renderContextData.timeStampQuerySet ) {

			// Create a GPUQuerySet which holds 2 timestamp query results: one for the
			// beginning and one for the end of compute pass execution.
			const timeStampQuerySet = this.device.createQuerySet( { type: 'timestamp', count: 2 } );

			const timestampWrites = {
				querySet: timeStampQuerySet,
				beginningOfPassWriteIndex: 0, // Write timestamp in index 0 when pass begins.
				endOfPassWriteIndex: 1, // Write timestamp in index 1 when pass ends.
			};

			Object.assign( descriptor, {
				timestampWrites,
			} );

			renderContextData.timeStampQuerySet = timeStampQuerySet;

		}

	}

	// timestamp utils

	prepareTimestampBuffer( renderContext, encoder ) {

		if ( ! this.hasFeature( GPUFeatureName.TimestampQuery ) || ! this.trackTimestamp ) return;

		const renderContextData = this.get( renderContext );

		const size = 2 * BigInt64Array.BYTES_PER_ELEMENT;

		if ( renderContextData.currentTimestampQueryBuffers === undefined ) {

			renderContextData.currentTimestampQueryBuffers = {
				resolveBuffer: this.device.createBuffer( {
					label: 'timestamp resolve buffer',
					size: size,
					usage: GPUBufferUsage.QUERY_RESOLVE | GPUBufferUsage.COPY_SRC,
				} ),
				resultBuffer: this.device.createBuffer( {
					label: 'timestamp result buffer',
					size: size,
					usage: GPUBufferUsage.COPY_DST | GPUBufferUsage.MAP_READ,
				} ),
				isMappingPending: false,
			};

		}

		const { resolveBuffer, resultBuffer, isMappingPending } = renderContextData.currentTimestampQueryBuffers;

		if ( isMappingPending === true ) return;

		encoder.resolveQuerySet( renderContextData.timeStampQuerySet, 0, 2, resolveBuffer, 0 );
		encoder.copyBufferToBuffer( resolveBuffer, 0, resultBuffer, 0, size );

	}

	async resolveTimestampAsync( renderContext, type = 'render' ) {

		if ( ! this.hasFeature( GPUFeatureName.TimestampQuery ) || ! this.trackTimestamp ) return;

		const renderContextData = this.get( renderContext );

		if ( renderContextData.currentTimestampQueryBuffers === undefined ) return;

		const { resultBuffer, isMappingPending } = renderContextData.currentTimestampQueryBuffers;

		if ( isMappingPending === true ) return;

		renderContextData.currentTimestampQueryBuffers.isMappingPending = true;

		resultBuffer.mapAsync( GPUMapMode.READ ).then( () => {

			const times = new BigUint64Array( resultBuffer.getMappedRange() );
			const duration = Number( times[ 1 ] - times[ 0 ] ) / 1000000;


			this.renderer.info.updateTimestamp( type, duration );

			resultBuffer.unmap();

			renderContextData.currentTimestampQueryBuffers.isMappingPending = false;

		} );

	}

	// node builder

	createNodeBuilder( object, renderer ) {

		return new WGSLNodeBuilder( object, renderer );

	}

	// program

	createProgram( program ) {

		const programGPU = this.get( program );

		programGPU.module = {
			module: this.device.createShaderModule( { code: program.code, label: program.stage } ),
			entryPoint: 'main'
		};

	}

	destroyProgram( program ) {

		this.delete( program );

	}

	// pipelines

	createRenderPipeline( renderObject, promises ) {

		this.pipelineUtils.createRenderPipeline( renderObject, promises );

	}

	createComputePipeline( computePipeline, bindings ) {

		this.pipelineUtils.createComputePipeline( computePipeline, bindings );

	}

	createBundleEncoder( renderContext, renderObject ) {

		return this.pipelineUtils.createBundleEncoder( renderContext, renderObject );

	}

	// bindings

	createBindings( bindGroup ) {

		this.bindingUtils.createBindings( bindGroup );

	}

	updateBindings( bindGroup ) {

		this.bindingUtils.createBindings( bindGroup );

	}

	updateBinding( binding ) {

		this.bindingUtils.updateBinding( binding );

	}

	// attributes

	createIndexAttribute( attribute ) {

		this.attributeUtils.createAttribute( attribute, GPUBufferUsage.INDEX | GPUBufferUsage.COPY_SRC | GPUBufferUsage.COPY_DST );

	}

	createAttribute( attribute ) {

		this.attributeUtils.createAttribute( attribute, GPUBufferUsage.VERTEX | GPUBufferUsage.COPY_SRC | GPUBufferUsage.COPY_DST );

	}

	createStorageAttribute( attribute ) {

		this.attributeUtils.createAttribute( attribute, GPUBufferUsage.STORAGE | GPUBufferUsage.VERTEX | GPUBufferUsage.COPY_SRC | GPUBufferUsage.COPY_DST );

	}

	updateAttribute( attribute ) {

		this.attributeUtils.updateAttribute( attribute );

	}

	destroyAttribute( attribute ) {

		this.attributeUtils.destroyAttribute( attribute );

	}

	// canvas

	updateSize() {

		this.colorBuffer = this.textureUtils.getColorBuffer();
		this.defaultRenderPassdescriptor = null;

	}

	// utils public

	getMaxAnisotropy() {

		return 16;

	}

	hasFeature( name ) {

		return this.device.features.has( name );

	}

	copyTextureToTexture( srcTexture, dstTexture, srcRegion = null, dstPosition = null, level = 0 ) {

		let dstX = 0;
		let dstY = 0;

		let srcX = 0;
		let srcY = 0;

		let srcWidth = srcTexture.image.width;
		let srcHeight = srcTexture.image.height;

		if ( srcRegion !== null ) {

			srcX = srcRegion.x;
			srcY = srcRegion.y;
			srcWidth = srcRegion.width;
			srcHeight = srcRegion.height;

		}

		if ( dstPosition !== null ) {

			dstX = dstPosition.x;
			dstY = dstPosition.y;

		}

		const encoder = this.device.createCommandEncoder( { label: 'copyTextureToTexture_' + srcTexture.id + '_' + dstTexture.id } );

		const sourceGPU = this.get( srcTexture ).texture;
		const destinationGPU = this.get( dstTexture ).texture;

		encoder.copyTextureToTexture(
			{
				texture: sourceGPU,
				mipLevel: level,
				origin: { x: srcX, y: srcY, z: 0 }
			},
			{
				texture: destinationGPU,
				mipLevel: level,
				origin: { x: dstX, y: dstY, z: 0 }
			},
			[
				srcWidth,
				srcHeight
			]
		);

		this.device.queue.submit( [ encoder.finish() ] );

	}

	copyFramebufferToTexture( texture, renderContext ) {

		const renderContextData = this.get( renderContext );

		const { encoder, descriptor } = renderContextData;

		let sourceGPU = null;

		if ( renderContext.renderTarget ) {

			if ( texture.isDepthTexture ) {

				sourceGPU = this.get( renderContext.depthTexture ).texture;

			} else {

				sourceGPU = this.get( renderContext.textures[ 0 ] ).texture;

			}

		} else {

			if ( texture.isDepthTexture ) {

				sourceGPU = this.textureUtils.getDepthBuffer( renderContext.depth, renderContext.stencil );

			} else {

				sourceGPU = this.context.getCurrentTexture();

			}

		}

		const destinationGPU = this.get( texture ).texture;

		if ( sourceGPU.format !== destinationGPU.format ) {

			console.error( 'WebGPUBackend: copyFramebufferToTexture: Source and destination formats do not match.', sourceGPU.format, destinationGPU.format );

			return;

		}

		renderContextData.currentPass.end();

		encoder.copyTextureToTexture(
			{
				texture: sourceGPU,
				origin: { x: 0, y: 0, z: 0 }
			},
			{
				texture: destinationGPU
			},
			[
				texture.image.width,
				texture.image.height
			]
		);

		if ( texture.generateMipmaps ) this.textureUtils.generateMipmaps( texture );

		descriptor.colorAttachments[ 0 ].loadOp = GPULoadOp.Load;
		if ( renderContext.depth ) descriptor.depthStencilAttachment.depthLoadOp = GPULoadOp.Load;
		if ( renderContext.stencil ) descriptor.depthStencilAttachment.stencilLoadOp = GPULoadOp.Load;

		renderContextData.currentPass = encoder.beginRenderPass( descriptor );
		renderContextData.currentSets = { attributes: {} };

	}

}

/*
const debugHandler = {

	get: function ( target, name ) {

		// Add |update
		if ( /^(create|destroy)/.test( name ) ) console.log( 'WebGPUBackend.' + name );

		return target[ name ];

	}

};
*/
class WebGPURenderer extends Renderer {

	constructor( parameters = {} ) {

		let BackendClass;

		if ( parameters.forceWebGL ) {

			BackendClass = WebGLBackend;

		} else if ( WebGPU.isAvailable() ) {

			BackendClass = WebGPUBackend;

		} else {

			BackendClass = WebGLBackend;

			console.warn( 'THREE.WebGPURenderer: WebGPU is not available, running under WebGL2 backend.' );

		}

		const backend = new BackendClass( parameters );

		//super( new Proxy( backend, debugHandler ) );
		super( backend, parameters );

		this.isWebGPURenderer = true;

	}

}

const quadMesh = new QuadMesh( new NodeMaterial() );

class PostProcessing {

	constructor( renderer, outputNode = vec4( 0, 0, 1, 1 ) ) {

		this.renderer = renderer;
		this.outputNode = outputNode;

		this.outputColorTransform = true;

		this.needsUpdate = true;

	}

	render() {

		this.update();

		const renderer = this.renderer;

		const toneMapping = renderer.toneMapping;
		const outputColorSpace = renderer.outputColorSpace;

		renderer.toneMapping = NoToneMapping;
		renderer.outputColorSpace = LinearSRGBColorSpace;

		//

		quadMesh.render( this.renderer );

		//

		renderer.toneMapping = toneMapping;
		renderer.outputColorSpace = outputColorSpace;

	}

	update() {

		if ( this.needsUpdate === true ) {

			const renderer = this.renderer;

			const toneMapping = renderer.toneMapping;
			const outputColorSpace = renderer.outputColorSpace;

			quadMesh.material.fragmentNode = this.outputColorTransform === true ? renderOutput( this.outputNode, toneMapping, outputColorSpace ) : this.outputNode.context( { toneMapping, outputColorSpace } );
			quadMesh.material.needsUpdate = true;

			this.needsUpdate = false;

		}

	}

	async renderAsync() {

		this.update();

		const renderer = this.renderer;

		const toneMapping = renderer.toneMapping;
		const outputColorSpace = renderer.outputColorSpace;

		renderer.toneMapping = NoToneMapping;
		renderer.outputColorSpace = LinearSRGBColorSpace;

		//

		await quadMesh.renderAsync( this.renderer );

		//

		renderer.toneMapping = toneMapping;
		renderer.outputColorSpace = outputColorSpace;

	}

}

class StorageTexture extends Texture {

	constructor( width = 1, height = 1 ) {

		super();

		this.image = { width, height };

		this.magFilter = LinearFilter;
		this.minFilter = LinearFilter;

		this.isStorageTexture = true;

	}

}

class StorageBufferAttribute extends BufferAttribute {

	constructor( array, itemSize, typeClass = Float32Array ) {

		if ( ArrayBuffer.isView( array ) === false ) array = new typeClass( array * itemSize );

		super( array, itemSize );

		this.isStorageBufferAttribute = true;

	}

}

class StorageInstancedBufferAttribute extends InstancedBufferAttribute {

	constructor( array, itemSize, typeClass = Float32Array ) {

		if ( ArrayBuffer.isView( array ) === false ) array = new typeClass( array * itemSize );

		super( array, itemSize );

		this.isStorageInstancedBufferAttribute = true;

	}

}

if ( typeof __THREE_DEVTOOLS__ !== 'undefined' ) {

	__THREE_DEVTOOLS__.dispatchEvent( new CustomEvent( 'register', { detail: {
		revision: REVISION,
	} } ) );

}

if ( typeof window !== 'undefined' ) {

	if ( window.__THREE__ ) {

		console.warn( 'WARNING: Multiple instances of Three.js being imported.' );

	} else {

		window.__THREE__ = REVISION;

	}

}

export { ACESFilmicToneMapping, AONode, AddEquation, AddOperation, AdditiveAnimationBlendMode, AdditiveBlending, AfterImageNode, AgXToneMapping, AlphaFormat, AlwaysCompare, AlwaysDepth, AlwaysStencilFunc, AmbientLight, AmbientLightNode, AnalyticLightNode, AnamorphicNode, AnimationAction, AnimationClip, AnimationLoader, AnimationMixer, AnimationObjectGroup, AnimationUtils, ArcCurve, ArrayCamera, ArrayElementNode, ArrowHelper, AssignNode, AttachedBindMode, AttributeNode, Audio, AudioAnalyser, AudioContext, AudioListener, AudioLoader, AxesHelper, BRDF_GGX, BRDF_Lambert, BackSide, BasicDepthPacking, BasicEnvironmentNode, BasicShadowMap, BatchNode, BatchedMesh, BlendModeNode, Bone, BooleanKeyframeTrack, Box2, Box3, Box3Helper, BoxGeometry, BoxHelper, Break, BufferAttribute, BufferAttributeNode, BufferGeometry, BufferGeometryLoader, BufferNode, BumpMapNode, BypassNode, ByteType, Cache, CacheNode, Camera, CameraHelper, CanvasTexture, CapsuleGeometry, CatmullRomCurve3, CheckerNode, CineonToneMapping, CircleGeometry, ClampToEdgeWrapping, Clock, CodeNode, Color, ColorAdjustmentNode, ColorKeyframeTrack, ColorManagement, ColorSpaceNode, CompressedArrayTexture, CompressedCubeTexture, CompressedTexture, CompressedTextureLoader, ComputeNode, CondNode, ConeGeometry, ConstNode, ConstantAlphaFactor, ConstantColorFactor, ContextNode, Continue, ConvertNode, CubeCamera, CubeReflectionMapping, CubeRefractionMapping, CubeTexture, CubeTextureLoader, CubeTextureNode, CubeUVReflectionMapping, CubicBezierCurve, CubicBezierCurve3, CubicInterpolant, CullFaceBack, CullFaceFront, CullFaceFrontBack, CullFaceNone, Curve, CurvePath, CustomBlending, CustomToneMapping, CylinderGeometry, Cylindrical, DFGApprox, D_GGX, Data3DTexture, DataArrayTexture, DataTexture, DataTextureLoader, DataUtils, DecrementStencilOp, DecrementWrapStencilOp, DefaultLoadingManager, DepthFormat, DepthOfFieldNode, DepthStencilFormat, DepthTexture, DetachedBindMode, DirectionalLight, DirectionalLightHelper, DirectionalLightNode, DiscardNode, DiscreteInterpolant, DisplayP3ColorSpace, DodecahedronGeometry, DotScreenNode, DoubleSide, DstAlphaFactor, DstColorFactor, DynamicCopyUsage, DynamicDrawUsage, DynamicReadUsage, EPSILON, EdgesGeometry, EllipseCurve, EnvironmentNode, EqualCompare, EqualDepth, EqualStencilFunc, EquirectUVNode, EquirectangularReflectionMapping, EquirectangularRefractionMapping, Euler, EventDispatcher, ExpressionNode, ExtrudeGeometry, F_Schlick, FileLoader, FilmNode, Float16BufferAttribute, Float32BufferAttribute, FloatType, Fog, FogExp2, FogExp2Node, FogNode, FogRangeNode, FramebufferTexture, FrontFacingNode, FrontSide, Frustum, FunctionCallNode, FunctionNode, FunctionOverloadingNode, GLBufferAttribute, GLSL1, GLSL3, GLSLNodeParser, GaussianBlurNode, GreaterCompare, GreaterDepth, GreaterEqualCompare, GreaterEqualDepth, GreaterEqualStencilFunc, GreaterStencilFunc, GridHelper, Group, HalfFloatType, HashNode, HemisphereLight, HemisphereLightHelper, HemisphereLightNode, IESSpotLight, IESSpotLightNode, INFINITY, IcosahedronGeometry, If, ImageBitmapLoader, ImageLoader, ImageUtils, IncrementStencilOp, IncrementWrapStencilOp, IndexNode, InstanceNode, InstancedBufferAttribute, InstancedBufferGeometry, InstancedInterleavedBuffer, InstancedMesh, InstancedPointsNodeMaterial, Int16BufferAttribute, Int32BufferAttribute, Int8BufferAttribute, IntType, InterleavedBuffer, InterleavedBufferAttribute, Interpolant, InterpolateDiscrete, InterpolateLinear, InterpolateSmooth, InvertStencilOp, IrradianceNode, JoinNode, KeepStencilOp, KeyframeTrack, LOD, LatheGeometry, Layers, LessCompare, LessDepth, LessEqualCompare, LessEqualDepth, LessEqualStencilFunc, LessStencilFunc, Light, LightNode, LightProbe, LightingContextNode, LightingModel, LightingNode, LightsNode, Line, Line2NodeMaterial, Line3, LineBasicMaterial, LineBasicNodeMaterial, LineCurve, LineCurve3, LineDashedMaterial, LineDashedNodeMaterial, LineLoop, LineSegments, LinearDisplayP3ColorSpace, LinearFilter, LinearInterpolant, LinearMipMapLinearFilter, LinearMipMapNearestFilter, LinearMipmapLinearFilter, LinearMipmapNearestFilter, LinearSRGBColorSpace, LinearToneMapping, LinearTransfer, Loader, LoaderUtils, LoadingManager, LoopNode, LoopOnce, LoopPingPong, LoopRepeat, LuminanceAlphaFormat, LuminanceFormat, Lut3DNode, MOUSE, MatcapUVNode, Material, MaterialLoader, MaterialNode, MaterialReferenceNode, MathNode, MathUtils, Matrix3, Matrix4, MaxEquation, MaxMipLevelNode, Mesh, MeshBasicMaterial, MeshBasicNodeMaterial, MeshDepthMaterial, MeshDistanceMaterial, MeshLambertMaterial, MeshLambertNodeMaterial, MeshMatcapMaterial, MeshMatcapNodeMaterial, MeshNormalMaterial, MeshNormalNodeMaterial, MeshPhongMaterial, MeshPhongNodeMaterial, MeshPhysicalMaterial, MeshPhysicalNodeMaterial, MeshSSSNodeMaterial, MeshStandardMaterial, MeshStandardNodeMaterial, MeshToonMaterial, MeshToonNodeMaterial, MinEquation, MirroredRepeatWrapping, MixOperation, ModelNode, ModelViewProjectionNode, MorphNode, MultiplyBlending, MultiplyOperation, NearestFilter, NearestMipMapLinearFilter, NearestMipMapNearestFilter, NearestMipmapLinearFilter, NearestMipmapNearestFilter, NeutralToneMapping, NeverCompare, NeverDepth, NeverStencilFunc, NoBlending, NoColorSpace, NoToneMapping, Node, NodeAttribute, NodeBuilder, NodeCache, NodeCode, NodeFrame, NodeFunctionInput, NodeKeywords, NodeLoader, NodeMaterial, NodeMaterialLoader, NodeObjectLoader, NodeShaderStage, NodeType, NodeUniform, NodeUpdateType, NodeUtils, NodeVar, NodeVarying, NormalAnimationBlendMode, NormalBlending, NormalMapNode, NotEqualCompare, NotEqualDepth, NotEqualStencilFunc, NumberKeyframeTrack, Object3D, Object3DNode, ObjectLoader, ObjectSpaceNormalMap, OctahedronGeometry, OneFactor, OneMinusConstantAlphaFactor, OneMinusConstantColorFactor, OneMinusDstAlphaFactor, OneMinusDstColorFactor, OneMinusSrcAlphaFactor, OneMinusSrcColorFactor, OperatorNode, OrthographicCamera, OscNode, OutputStructNode, P3Primaries, PCFShadowMap, PCFSoftShadowMap, PI, PI2, PMREMGenerator, PMREMNode, PackingNode, ParameterNode, PassNode, Path, PerspectiveCamera, PhongLightingModel, PhysicalLightingModel, Plane, PlaneGeometry, PlaneHelper, PointLight, PointLightHelper, PointLightNode, PointUVNode, Points, PointsMaterial, PointsNodeMaterial, PolarGridHelper, PolyhedronGeometry, PositionalAudio, PostProcessing, PosterizeNode, PropertyBinding, PropertyMixer, PropertyNode, QuadMesh, QuadraticBezierCurve, QuadraticBezierCurve3, Quaternion, QuaternionKeyframeTrack, QuaternionLinearInterpolant, RED_GREEN_RGTC2_Format, RED_RGTC1_Format, REVISION, RGBADepthPacking, RGBAFormat, RGBAIntegerFormat, RGBA_ASTC_10x10_Format, RGBA_ASTC_10x5_Format, RGBA_ASTC_10x6_Format, RGBA_ASTC_10x8_Format, RGBA_ASTC_12x10_Format, RGBA_ASTC_12x12_Format, RGBA_ASTC_4x4_Format, RGBA_ASTC_5x4_Format, RGBA_ASTC_5x5_Format, RGBA_ASTC_6x5_Format, RGBA_ASTC_6x6_Format, RGBA_ASTC_8x5_Format, RGBA_ASTC_8x6_Format, RGBA_ASTC_8x8_Format, RGBA_BPTC_Format, RGBA_ETC2_EAC_Format, RGBA_PVRTC_2BPPV1_Format, RGBA_PVRTC_4BPPV1_Format, RGBA_S3TC_DXT1_Format, RGBA_S3TC_DXT3_Format, RGBA_S3TC_DXT5_Format, RGBDepthPacking, RGBFormat, RGBIntegerFormat, RGBShiftNode, RGB_BPTC_SIGNED_Format, RGB_BPTC_UNSIGNED_Format, RGB_ETC1_Format, RGB_ETC2_Format, RGB_PVRTC_2BPPV1_Format, RGB_PVRTC_4BPPV1_Format, RGB_S3TC_DXT1_Format, RGDepthPacking, RGFormat, RGIntegerFormat, RTTNode, RangeNode, RawShaderMaterial, Ray, Raycaster, Rec709Primaries, RectAreaLight, RectAreaLightNode, RedFormat, RedIntegerFormat, ReferenceNode, ReflectorNode, ReinhardToneMapping, RemapNode, RenderOutputNode, RenderTarget, RendererReferenceNode, RepeatWrapping, ReplaceStencilOp, Return, ReverseSubtractEquation, RingGeometry, RotateNode, RotateUVNode, SIGNED_RED_GREEN_RGTC2_Format, SIGNED_RED_RGTC1_Format, SRGBColorSpace, SRGBTransfer, Scene, SceneNode, Schlick_to_F0, ScriptableNode, ScriptableValueNode, SetNode, ShaderMaterial, ShaderNode, ShadowMaterial, ShadowNodeMaterial, Shape, ShapeGeometry, ShapePath, ShapeUtils, ShortType, Skeleton, SkeletonHelper, SkinnedMesh, SkinningNode, SobelOperatorNode, Source, Sphere, SphereGeometry, Spherical, SphericalHarmonics3, SplineCurve, SplitNode, SpotLight, SpotLightHelper, SpotLightNode, Sprite, SpriteMaterial, SpriteNodeMaterial, SpriteSheetUVNode, SrcAlphaFactor, SrcAlphaSaturateFactor, SrcColorFactor, StackNode, StaticCopyUsage, StaticDrawUsage, StaticReadUsage, StereoCamera, StorageArrayElementNode, StorageBufferAttribute, StorageBufferNode, StorageInstancedBufferAttribute, StorageTexture, StorageTextureNode, StreamCopyUsage, StreamDrawUsage, StreamReadUsage, StringKeyframeTrack, SubtractEquation, SubtractiveBlending, TBNViewMatrix, TOUCH, TangentSpaceNormalMap, TempNode, TetrahedronGeometry, Texture, Texture3DNode, TextureBicubicNode, TextureLoader, TextureNode, TextureSizeNode, TimerNode, ToneMappingNode, TorusGeometry, TorusKnotGeometry, Triangle, TriangleFanDrawMode, TriangleStripDrawMode, TrianglesDrawMode, TriplanarTexturesNode, TubeGeometry, UVMapping, Uint16BufferAttribute, Uint32BufferAttribute, Uint8BufferAttribute, Uint8ClampedBufferAttribute, Uniform$1 as Uniform, UniformGroupNode, UniformNode, UniformsGroup$1 as UniformsGroup, UniformsNode, UnsignedByteType, UnsignedInt248Type, UnsignedInt5999Type, UnsignedIntType, UnsignedShort4444Type, UnsignedShort5551Type, UnsignedShortType, UserDataNode, VSMShadowMap, V_GGX_SmithCorrelated, VarNode, VaryingNode, Vector2, Vector3, Vector4, VectorKeyframeTrack, VertexColorNode, VideoTexture, ViewportDepthNode, ViewportDepthTextureNode, ViewportNode, ViewportSharedTextureNode, ViewportTextureNode, VolumeNodeMaterial, WebGL3DRenderTarget, WebGLArrayRenderTarget, WebGLCoordinateSystem, WebGLCubeRenderTarget, WebGLMultipleRenderTargets, WebGLRenderTarget, WebGPUCoordinateSystem, WebGPURenderer, WireframeGeometry, WrapAroundEnding, ZeroCurvatureEnding, ZeroFactor, ZeroSlopeEnding, ZeroStencilOp, abs, acos, add, addLightNode, addNodeClass, addNodeElement, addNodeMaterial, afterImage, all, alphaT, anamorphic, and, anisotropy, anisotropyB, anisotropyT, any, append, arrayBuffer, asin, assign, atan, atan2, attribute, backgroundBlurriness, backgroundIntensity, batch, bitAnd, bitNot, bitOr, bitXor, bitangentGeometry, bitangentLocal, bitangentView, bitangentWorld, bitcast, blur, bmat2, bmat3, bmat4, bool, buffer, bufferAttribute, bumpMap, burn, bvec2, bvec3, bvec4, bypass, cache, call, cameraFar, cameraLogDepth, cameraNear, cameraNormalMatrix, cameraPosition, cameraProjectionMatrix, cameraProjectionMatrixInverse, cameraViewMatrix, cameraWorldMatrix, cbrt, ceil, checker, clamp, clearcoat, clearcoatRoughness, code, color, colorSpaceToLinear, colorToDirection, compute, cond, context, convert, cos, createCanvasElement, createNodeFromType, createNodeMaterialFromType, cross, cubeTexture, dFdx, dFdy, dashSize, defaultBuildStages, defaultShaderStages, defined, degrees, densityFog, depth, depthPass, difference, diffuseColor, directionToColor, discard, distance, div, dodge, dof, dot, dotScreen, drawIndex, dynamicBufferAttribute, element, equal, equals, equirectUV, exp, exp2, expression, faceDirection, faceForward, film, float, floor, fog, fract, frameGroup, frameId, frontFacing, fwidth, gain, gapSize, gaussianBlur, getConstNodeType, getCurrentStack, getDirection, getDistanceAttenuation, getGeometryRoughness, getRoughness, global, glsl, glslFn, greaterThan, greaterThanEqual, hash, hue, imat2, imat3, imat4, instance, instanceIndex, instancedBufferAttribute, instancedDynamicBufferAttribute, int, inverseSqrt, iridescence, iridescenceIOR, iridescenceThickness, ivec2, ivec3, ivec4, js, label, length, lengthSq, lessThan, lessThanEqual, lightTargetDirection, lightingContext, lights, lightsNode, linearDepth, linearToColorSpace, linearTosRGB, log, log2, loop, lumaCoeffs, luminance, lut3D, mat2, mat3, mat4, matcapUV, materialAlphaTest, materialAnisotropy, materialAnisotropyVector, materialClearcoat, materialClearcoatNormal, materialClearcoatRoughness, materialColor, materialDispersion, materialEmissive, materialIridescence, materialIridescenceIOR, materialIridescenceThickness, materialLineDashOffset, materialLineDashSize, materialLineGapSize, materialLineScale, materialLineWidth, materialMetalness, materialNormal, materialOpacity, materialPointWidth, materialReference, materialReflectivity, materialRotation, materialRoughness, materialSheen, materialSheenRoughness, materialShininess, materialSpecular, materialSpecularStrength, max$1 as max, maxMipLevel, metalness, min$1 as min, mix, mod, modelDirection, modelNormalMatrix, modelPosition, modelScale, modelViewMatrix, modelViewPosition, modelViewProjection, modelWorldMatrix, modelWorldMatrixInverse, morphReference, mul, mx_aastep, mx_cell_noise_float, mx_contrast, mx_fractal_noise_float, mx_fractal_noise_vec2, mx_fractal_noise_vec3, mx_fractal_noise_vec4, mx_hsvtorgb, mx_noise_float, mx_noise_vec3, mx_noise_vec4, mx_ramplr, mx_ramptb, mx_rgbtohsv, mx_safepower, mx_splitlr, mx_splittb, mx_srgb_texture_to_lin_rec709, mx_transform_uv, mx_worley_noise_float, mx_worley_noise_vec2, mx_worley_noise_vec3, negate, nodeArray, nodeImmutable, nodeObject, nodeObjects, nodeProxy, normalGeometry, normalLocal, normalMap, normalView, normalWorld, normalize, not, objectDirection, objectGroup, objectNormalMatrix, objectPosition, objectScale, objectViewMatrix, objectViewPosition, objectWorldMatrix, oneMinus, or, orthographicDepthToViewZ, oscSawtooth, oscSine, oscSquare, oscTriangle, output, outputStruct, overlay, overloadingFn, parabola, parallaxDirection, parallaxUV, parameter, pass, pcurve, perspectiveDepthToViewZ, pmremTexture, pointUV, pointWidth, positionGeometry, positionLocal, positionView, positionViewDirection, positionWorld, positionWorldDirection, posterize, pow, pow2, pow3, pow4, property, radians, rand, range, rangeFog, reciprocal, reference, referenceBuffer, reflect, reflectVector, reflectView, reflector, refract, remainder, remap, remapClamp, renderGroup, renderOutput, rendererReference, rgbShift, rotate, rotateUV, roughness, round, rtt, sRGBToLinear, sampler, saturate, saturation, screen, scriptable, scriptableValue, setCurrentStack, shaderStages, sheen, sheenRoughness, shiftLeft, shiftRight, shininess, sign, sin, sinc, skinning, skinningReference, smoothstep, sobel, specularColor, split, spritesheetUV, sqrt, stack, step, storage, storageObject, storageTexture, string, sub, tan, tangentGeometry, tangentLocal, tangentView, tangentWorld, temp, texture, texture3D, textureBicubic, textureCubeUV, textureLoad, texturePass, textureSize, textureStore, threshold, timerDelta, timerGlobal, timerLocal, toneMapping, transformDirection, transformedBentNormalView, transformedBitangentView, transformedBitangentWorld, transformedClearcoatNormalView, transformedNormalView, transformedNormalWorld, transformedTangentView, transformedTangentWorld, transpose, triNoise3D, triplanarTexture, triplanarTextures, trunc, tslFn, uint, umat2, umat3, umat4, uniform, uniformGroup, uniforms, userData, uv, uvec2, uvec3, uvec4, varying, varyingProperty, vec2, vec3, vec4, vectorComponents, vertexColor, vertexIndex, vibrance, viewZToOrthographicDepth, viewZToPerspectiveDepth, viewport, viewportBottomLeft, viewportBottomRight, viewportCoordinate, viewportDepthTexture, viewportLinearDepth, viewportMipTexture, viewportResolution, viewportSharedTexture, viewportTexture, viewportTopLeft, viewportTopRight, wgsl, wgslFn, xor };