three.js/build/three.js

(function (global, factory) {
	typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
	typeof define === 'function' && define.amd ? define(['exports'], factory) :
	(global = global || self, factory(global.THREE = {}));
}(this, (function (exports) { 'use strict';

	// Polyfills

	if ( Number.EPSILON === undefined ) {

		Number.EPSILON = Math.pow( 2, - 52 );

	}

	if ( Number.isInteger === undefined ) {

		// Missing in IE
		// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isInteger

		Number.isInteger = function ( value ) {

			return typeof value === 'number' && isFinite( value ) && Math.floor( value ) === value;

		};

	}

	//

	if ( Math.sign === undefined ) {

		// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/sign

		Math.sign = function ( x ) {

			return ( x < 0 ) ? - 1 : ( x > 0 ) ? 1 : + x;

		};

	}

	if ( 'name' in Function.prototype === false ) {

		// Missing in IE
		// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name

		Object.defineProperty( Function.prototype, 'name', {

			get: function () {

				return this.toString().match( /^\s*function\s*([^\(\s]*)/ )[ 1 ];

			}

		} );

	}

	if ( Object.assign === undefined ) {

		// Missing in IE
		// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign

		Object.assign = function ( target ) {

			if ( target === undefined || target === null ) {

				throw new TypeError( 'Cannot convert undefined or null to object' );

			}

			var output = Object( target );

			for ( var index = 1; index < arguments.length; index ++ ) {

				var source = arguments[ index ];

				if ( source !== undefined && source !== null ) {

					for ( var nextKey in source ) {

						if ( Object.prototype.hasOwnProperty.call( source, nextKey ) ) {

							output[ nextKey ] = source[ nextKey ];

						}

					}

				}

			}

			return output;

		};

	}

	var REVISION = '114dev';
	var MOUSE = { LEFT: 0, MIDDLE: 1, RIGHT: 2, ROTATE: 0, DOLLY: 1, PAN: 2 };
	var TOUCH = { ROTATE: 0, PAN: 1, DOLLY_PAN: 2, DOLLY_ROTATE: 3 };
	var CullFaceNone = 0;
	var CullFaceBack = 1;
	var CullFaceFront = 2;
	var CullFaceFrontBack = 3;
	var FrontFaceDirectionCW = 0;
	var FrontFaceDirectionCCW = 1;
	var BasicShadowMap = 0;
	var PCFShadowMap = 1;
	var PCFSoftShadowMap = 2;
	var VSMShadowMap = 3;
	var FrontSide = 0;
	var BackSide = 1;
	var DoubleSide = 2;
	var FlatShading = 1;
	var SmoothShading = 2;
	var NoBlending = 0;
	var NormalBlending = 1;
	var AdditiveBlending = 2;
	var SubtractiveBlending = 3;
	var MultiplyBlending = 4;
	var CustomBlending = 5;
	var AddEquation = 100;
	var SubtractEquation = 101;
	var ReverseSubtractEquation = 102;
	var MinEquation = 103;
	var MaxEquation = 104;
	var ZeroFactor = 200;
	var OneFactor = 201;
	var SrcColorFactor = 202;
	var OneMinusSrcColorFactor = 203;
	var SrcAlphaFactor = 204;
	var OneMinusSrcAlphaFactor = 205;
	var DstAlphaFactor = 206;
	var OneMinusDstAlphaFactor = 207;
	var DstColorFactor = 208;
	var OneMinusDstColorFactor = 209;
	var SrcAlphaSaturateFactor = 210;
	var NeverDepth = 0;
	var AlwaysDepth = 1;
	var LessDepth = 2;
	var LessEqualDepth = 3;
	var EqualDepth = 4;
	var GreaterEqualDepth = 5;
	var GreaterDepth = 6;
	var NotEqualDepth = 7;
	var MultiplyOperation = 0;
	var MixOperation = 1;
	var AddOperation = 2;
	var NoToneMapping = 0;
	var LinearToneMapping = 1;
	var ReinhardToneMapping = 2;
	var Uncharted2ToneMapping = 3;
	var CineonToneMapping = 4;
	var ACESFilmicToneMapping = 5;

	var UVMapping = 300;
	var CubeReflectionMapping = 301;
	var CubeRefractionMapping = 302;
	var EquirectangularReflectionMapping = 303;
	var EquirectangularRefractionMapping = 304;
	var SphericalReflectionMapping = 305;
	var CubeUVReflectionMapping = 306;
	var CubeUVRefractionMapping = 307;
	var RepeatWrapping = 1000;
	var ClampToEdgeWrapping = 1001;
	var MirroredRepeatWrapping = 1002;
	var NearestFilter = 1003;
	var NearestMipmapNearestFilter = 1004;
	var NearestMipMapNearestFilter = 1004;
	var NearestMipmapLinearFilter = 1005;
	var NearestMipMapLinearFilter = 1005;
	var LinearFilter = 1006;
	var LinearMipmapNearestFilter = 1007;
	var LinearMipMapNearestFilter = 1007;
	var LinearMipmapLinearFilter = 1008;
	var LinearMipMapLinearFilter = 1008;
	var UnsignedByteType = 1009;
	var ByteType = 1010;
	var ShortType = 1011;
	var UnsignedShortType = 1012;
	var IntType = 1013;
	var UnsignedIntType = 1014;
	var FloatType = 1015;
	var HalfFloatType = 1016;
	var UnsignedShort4444Type = 1017;
	var UnsignedShort5551Type = 1018;
	var UnsignedShort565Type = 1019;
	var UnsignedInt248Type = 1020;
	var AlphaFormat = 1021;
	var RGBFormat = 1022;
	var RGBAFormat = 1023;
	var LuminanceFormat = 1024;
	var LuminanceAlphaFormat = 1025;
	var RGBEFormat = RGBAFormat;
	var DepthFormat = 1026;
	var DepthStencilFormat = 1027;
	var RedFormat = 1028;
	var RedIntegerFormat = 1029;
	var RGFormat = 1030;
	var RGIntegerFormat = 1031;
	var RGBIntegerFormat = 1032;
	var RGBAIntegerFormat = 1033;

	var RGB_S3TC_DXT1_Format = 33776;
	var RGBA_S3TC_DXT1_Format = 33777;
	var RGBA_S3TC_DXT3_Format = 33778;
	var RGBA_S3TC_DXT5_Format = 33779;
	var RGB_PVRTC_4BPPV1_Format = 35840;
	var RGB_PVRTC_2BPPV1_Format = 35841;
	var RGBA_PVRTC_4BPPV1_Format = 35842;
	var RGBA_PVRTC_2BPPV1_Format = 35843;
	var RGB_ETC1_Format = 36196;
	var RGB_ETC2_Format = 37492;
	var RGBA_ETC2_EAC_Format = 37496;
	var RGBA_ASTC_4x4_Format = 37808;
	var RGBA_ASTC_5x4_Format = 37809;
	var RGBA_ASTC_5x5_Format = 37810;
	var RGBA_ASTC_6x5_Format = 37811;
	var RGBA_ASTC_6x6_Format = 37812;
	var RGBA_ASTC_8x5_Format = 37813;
	var RGBA_ASTC_8x6_Format = 37814;
	var RGBA_ASTC_8x8_Format = 37815;
	var RGBA_ASTC_10x5_Format = 37816;
	var RGBA_ASTC_10x6_Format = 37817;
	var RGBA_ASTC_10x8_Format = 37818;
	var RGBA_ASTC_10x10_Format = 37819;
	var RGBA_ASTC_12x10_Format = 37820;
	var RGBA_ASTC_12x12_Format = 37821;
	var LoopOnce = 2200;
	var LoopRepeat = 2201;
	var LoopPingPong = 2202;
	var InterpolateDiscrete = 2300;
	var InterpolateLinear = 2301;
	var InterpolateSmooth = 2302;
	var ZeroCurvatureEnding = 2400;
	var ZeroSlopeEnding = 2401;
	var WrapAroundEnding = 2402;
	var TrianglesDrawMode = 0;
	var TriangleStripDrawMode = 1;
	var TriangleFanDrawMode = 2;
	var LinearEncoding = 3000;
	var sRGBEncoding = 3001;
	var GammaEncoding = 3007;
	var RGBEEncoding = 3002;
	var LogLuvEncoding = 3003;
	var RGBM7Encoding = 3004;
	var RGBM16Encoding = 3005;
	var RGBDEncoding = 3006;
	var BasicDepthPacking = 3200;
	var RGBADepthPacking = 3201;
	var TangentSpaceNormalMap = 0;
	var ObjectSpaceNormalMap = 1;

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

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

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

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

	function EventDispatcher() {}

	Object.assign( EventDispatcher.prototype, {

		addEventListener: function ( type, listener ) {

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

			var listeners = this._listeners;

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

				listeners[ type ] = [];

			}

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

				listeners[ type ].push( listener );

			}

		},

		hasEventListener: function ( type, listener ) {

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

			var listeners = this._listeners;

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

		},

		removeEventListener: function ( type, listener ) {

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

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

			if ( listenerArray !== undefined ) {

				var index = listenerArray.indexOf( listener );

				if ( index !== - 1 ) {

					listenerArray.splice( index, 1 );

				}

			}

		},

		dispatchEvent: function ( event ) {

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

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

			if ( listenerArray !== undefined ) {

				event.target = this;

				var array = listenerArray.slice( 0 );

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

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

				}

			}

		}

	} );

	/**
	 * @author alteredq / http://alteredqualia.com/
	 * @author mrdoob / http://mrdoob.com/
	 * @author WestLangley / http://github.com/WestLangley
	 * @author thezwap
	 */

	var _lut = [];

	for ( var i = 0; i < 256; i ++ ) {

		_lut[ i ] = ( i < 16 ? '0' : '' ) + ( i ).toString( 16 );

	}

	var MathUtils = {

		DEG2RAD: Math.PI / 180,
		RAD2DEG: 180 / Math.PI,

		generateUUID: function () {

			// http://stackoverflow.com/questions/105034/how-to-create-a-guid-uuid-in-javascript/21963136#21963136

			var d0 = Math.random() * 0xffffffff | 0;
			var d1 = Math.random() * 0xffffffff | 0;
			var d2 = Math.random() * 0xffffffff | 0;
			var d3 = Math.random() * 0xffffffff | 0;
			var 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 ];

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

		},

		clamp: function ( value, min, max ) {

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

		},

		// compute euclidian modulo of m % n
		// https://en.wikipedia.org/wiki/Modulo_operation

		euclideanModulo: function ( n, m ) {

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

		},

		// Linear mapping from range <a1, a2> to range <b1, b2>

		mapLinear: function ( x, a1, a2, b1, b2 ) {

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

		},

		// https://en.wikipedia.org/wiki/Linear_interpolation

		lerp: function ( x, y, t ) {

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

		},

		// http://en.wikipedia.org/wiki/Smoothstep

		smoothstep: function ( x, min, max ) {

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

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

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

		},

		smootherstep: function ( 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

		randInt: function ( low, high ) {

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

		},

		// Random float from <low, high> interval

		randFloat: function ( low, high ) {

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

		},

		// Random float from <-range/2, range/2> interval

		randFloatSpread: function ( range ) {

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

		},

		degToRad: function ( degrees ) {

			return degrees * MathUtils.DEG2RAD;

		},

		radToDeg: function ( radians ) {

			return radians * MathUtils.RAD2DEG;

		},

		isPowerOfTwo: function ( value ) {

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

		},

		ceilPowerOfTwo: function ( value ) {

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

		},

		floorPowerOfTwo: function ( value ) {

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

		},

		setQuaternionFromProperEuler: function ( 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

			var cos = Math.cos;
			var sin = Math.sin;

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

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

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

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

			if ( order === 'XYX' ) {

				q.set( c2 * s13, s2 * c1_3, s2 * s1_3, c2 * c13 );

			} else if ( order === 'YZY' ) {

				q.set( s2 * s1_3, c2 * s13, s2 * c1_3, c2 * c13 );

			} else if ( order === 'ZXZ' ) {

				q.set( s2 * c1_3, s2 * s1_3, c2 * s13, c2 * c13 );

			} else if ( order === 'XZX' ) {

				q.set( c2 * s13, s2 * s3_1, s2 * c3_1, c2 * c13 );

			} else if ( order === 'YXY' ) {

				q.set( s2 * c3_1, c2 * s13, s2 * s3_1, c2 * c13 );

			} else if ( order === 'ZYZ' ) {

				q.set( s2 * s3_1, s2 * c3_1, c2 * s13, c2 * c13 );

			} else {

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

			}

		}

	};

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author philogb / http://blog.thejit.org/
	 * @author egraether / http://egraether.com/
	 * @author zz85 / http://www.lab4games.net/zz85/blog
	 */

	function Vector2( x, y ) {

		this.x = x || 0;
		this.y = y || 0;

	}

	Object.defineProperties( Vector2.prototype, {

		"width": {

			get: function () {

				return this.x;

			},

			set: function ( value ) {

				this.x = value;

			}

		},

		"height": {

			get: function () {

				return this.y;

			},

			set: function ( value ) {

				this.y = value;

			}

		}

	} );

	Object.assign( Vector2.prototype, {

		isVector2: true,

		set: function ( x, y ) {

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

			return this;

		},

		setScalar: function ( scalar ) {

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

			return this;

		},

		setX: function ( x ) {

			this.x = x;

			return this;

		},

		setY: function ( y ) {

			this.y = y;

			return this;

		},

		setComponent: function ( 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: function ( index ) {

			switch ( index ) {

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

			}

		},

		clone: function () {

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

		},

		copy: function ( v ) {

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

			return this;

		},

		add: function ( v, w ) {

			if ( w !== undefined ) {

				console.warn( 'THREE.Vector2: .add() now only accepts one argument. Use .addVectors( a, b ) instead.' );
				return this.addVectors( v, w );

			}

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

			return this;

		},

		addScalar: function ( s ) {

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

			return this;

		},

		addVectors: function ( a, b ) {

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

			return this;

		},

		addScaledVector: function ( v, s ) {

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

			return this;

		},

		sub: function ( v, w ) {

			if ( w !== undefined ) {

				console.warn( 'THREE.Vector2: .sub() now only accepts one argument. Use .subVectors( a, b ) instead.' );
				return this.subVectors( v, w );

			}

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

			return this;

		},

		subScalar: function ( s ) {

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

			return this;

		},

		subVectors: function ( a, b ) {

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

			return this;

		},

		multiply: function ( v ) {

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

			return this;

		},

		multiplyScalar: function ( scalar ) {

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

			return this;

		},

		divide: function ( v ) {

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

			return this;

		},

		divideScalar: function ( scalar ) {

			return this.multiplyScalar( 1 / scalar );

		},

		applyMatrix3: function ( m ) {

			var x = this.x, y = this.y;
			var 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: function ( v ) {

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

			return this;

		},

		max: function ( v ) {

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

			return this;

		},

		clamp: function ( 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: function ( 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: function ( min, max ) {

			var length = this.length();

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

		},

		floor: function () {

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

			return this;

		},

		ceil: function () {

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

			return this;

		},

		round: function () {

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

			return this;

		},

		roundToZero: function () {

			this.x = ( this.x < 0 ) ? Math.ceil( this.x ) : Math.floor( this.x );
			this.y = ( this.y < 0 ) ? Math.ceil( this.y ) : Math.floor( this.y );

			return this;

		},

		negate: function () {

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

			return this;

		},

		dot: function ( v ) {

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

		},

		cross: function ( v ) {

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

		},

		lengthSq: function () {

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

		},

		length: function () {

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

		},

		manhattanLength: function () {

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

		},

		normalize: function () {

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

		},

		angle: function () {

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

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

			return angle;

		},

		distanceTo: function ( v ) {

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

		},

		distanceToSquared: function ( v ) {

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

		},

		manhattanDistanceTo: function ( v ) {

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

		},

		setLength: function ( length ) {

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

		},

		lerp: function ( v, alpha ) {

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

			return this;

		},

		lerpVectors: function ( v1, v2, alpha ) {

			return this.subVectors( v2, v1 ).multiplyScalar( alpha ).add( v1 );

		},

		equals: function ( v ) {

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

		},

		fromArray: function ( array, offset ) {

			if ( offset === undefined ) { offset = 0; }

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

			return this;

		},

		toArray: function ( array, offset ) {

			if ( array === undefined ) { array = []; }
			if ( offset === undefined ) { offset = 0; }

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

			return array;

		},

		fromBufferAttribute: function ( attribute, index, offset ) {

			if ( offset !== undefined ) {

				console.warn( 'THREE.Vector2: offset has been removed from .fromBufferAttribute().' );

			}

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

			return this;

		},

		rotateAround: function ( center, angle ) {

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

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

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

			return this;

		}

	} );

	/**
	 * @author alteredq / http://alteredqualia.com/
	 * @author WestLangley / http://github.com/WestLangley
	 * @author bhouston / http://clara.io
	 * @author tschw
	 */

	function Matrix3() {

		this.elements = [

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

		];

		if ( arguments.length > 0 ) {

			console.error( 'THREE.Matrix3: the constructor no longer reads arguments. use .set() instead.' );

		}

	}

	Object.assign( Matrix3.prototype, {

		isMatrix3: true,

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

			var 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: function () {

			this.set(

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

			);

			return this;

		},

		clone: function () {

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

		},

		copy: function ( m ) {

			var te = this.elements;
			var 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: function ( xAxis, yAxis, zAxis ) {

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

			return this;

		},

		setFromMatrix4: function ( m ) {

			var 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: function ( m ) {

			return this.multiplyMatrices( this, m );

		},

		premultiply: function ( m ) {

			return this.multiplyMatrices( m, this );

		},

		multiplyMatrices: function ( a, b ) {

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

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

			var b11 = be[ 0 ], b12 = be[ 3 ], b13 = be[ 6 ];
			var b21 = be[ 1 ], b22 = be[ 4 ], b23 = be[ 7 ];
			var 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: function ( s ) {

			var 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: function () {

			var te = this.elements;

			var 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;

		},

		getInverse: function ( matrix, throwOnDegenerate ) {

			if ( matrix && matrix.isMatrix4 ) {

				console.error( "THREE.Matrix3: .getInverse() no longer takes a Matrix4 argument." );

			}

			var me = matrix.elements,
				te = this.elements,

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

				var msg = "THREE.Matrix3: .getInverse() can't invert matrix, determinant is 0";

				if ( throwOnDegenerate === true ) {

					throw new Error( msg );

				} else {

					console.warn( msg );

				}

				return this.identity();

			}

			var 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: function () {

			var tmp, 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: function ( matrix4 ) {

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

		},

		transposeIntoArray: function ( r ) {

			var 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: function ( tx, ty, sx, sy, rotation, cx, cy ) {

			var c = Math.cos( rotation );
			var 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
			);

		},

		scale: function ( sx, sy ) {

			var te = this.elements;

			te[ 0 ] *= sx; te[ 3 ] *= sx; te[ 6 ] *= sx;
			te[ 1 ] *= sy; te[ 4 ] *= sy; te[ 7 ] *= sy;

			return this;

		},

		rotate: function ( theta ) {

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

			var te = this.elements;

			var a11 = te[ 0 ], a12 = te[ 3 ], a13 = te[ 6 ];
			var a21 = te[ 1 ], a22 = te[ 4 ], a23 = te[ 7 ];

			te[ 0 ] = c * a11 + s * a21;
			te[ 3 ] = c * a12 + s * a22;
			te[ 6 ] = c * a13 + s * a23;

			te[ 1 ] = - s * a11 + c * a21;
			te[ 4 ] = - s * a12 + c * a22;
			te[ 7 ] = - s * a13 + c * a23;

			return this;

		},

		translate: function ( tx, ty ) {

			var te = this.elements;

			te[ 0 ] += tx * te[ 2 ]; te[ 3 ] += tx * te[ 5 ]; te[ 6 ] += tx * te[ 8 ];
			te[ 1 ] += ty * te[ 2 ]; te[ 4 ] += ty * te[ 5 ]; te[ 7 ] += ty * te[ 8 ];

			return this;

		},

		equals: function ( matrix ) {

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

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

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

			}

			return true;

		},

		fromArray: function ( array, offset ) {

			if ( offset === undefined ) { offset = 0; }

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

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

			}

			return this;

		},

		toArray: function ( array, offset ) {

			if ( array === undefined ) { array = []; }
			if ( offset === undefined ) { offset = 0; }

			var 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;

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author alteredq / http://alteredqualia.com/
	 * @author szimek / https://github.com/szimek/
	 */

	var _canvas;

	var ImageUtils = {

		getDataURL: function ( image ) {

			var canvas;

			if ( typeof HTMLCanvasElement == 'undefined' ) {

				return image.src;

			} else if ( image instanceof HTMLCanvasElement ) {

				canvas = image;

			} else {

				if ( _canvas === undefined ) { _canvas = document.createElementNS( 'http://www.w3.org/1999/xhtml', 'canvas' ); }

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

				var 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 ) {

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

			} else {

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

			}

		}

	};

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author alteredq / http://alteredqualia.com/
	 * @author szimek / https://github.com/szimek/
	 */

	var textureId = 0;

	function Texture( image, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy, encoding ) {

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

		this.uuid = MathUtils.generateUUID();

		this.name = '';

		this.image = image !== undefined ? image : Texture.DEFAULT_IMAGE;
		this.mipmaps = [];

		this.mapping = mapping !== undefined ? mapping : Texture.DEFAULT_MAPPING;

		this.wrapS = wrapS !== undefined ? wrapS : ClampToEdgeWrapping;
		this.wrapT = wrapT !== undefined ? wrapT : ClampToEdgeWrapping;

		this.magFilter = magFilter !== undefined ? magFilter : LinearFilter;
		this.minFilter = minFilter !== undefined ? minFilter : LinearMipmapLinearFilter;

		this.anisotropy = anisotropy !== undefined ? anisotropy : 1;

		this.format = format !== undefined ? format : RGBAFormat;
		this.internalFormat = null;
		this.type = type !== undefined ? type : UnsignedByteType;

		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)

		// Values of encoding !== THREE.LinearEncoding only supported on map, envMap and emissiveMap.
		//
		// Also changing the encoding after already used by a Material will not automatically make the Material
		// update. You need to explicitly call Material.needsUpdate to trigger it to recompile.
		this.encoding = encoding !== undefined ? encoding : LinearEncoding;

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

	}

	Texture.DEFAULT_IMAGE = undefined;
	Texture.DEFAULT_MAPPING = UVMapping;

	Texture.prototype = Object.assign( Object.create( EventDispatcher.prototype ), {

		constructor: Texture,

		isTexture: true,

		updateMatrix: function () {

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

		},

		clone: function () {

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

		},

		copy: function ( source ) {

			this.name = source.name;

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

			this.mapping = source.mapping;

			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.encoding = source.encoding;

			return this;

		},

		toJSON: function ( meta ) {

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

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

				return meta.textures[ this.uuid ];

			}

			var output = {

				metadata: {
					version: 4.5,
					type: 'Texture',
					generator: 'Texture.toJSON'
				},

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

				mapping: this.mapping,

				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,
				type: this.type,
				encoding: this.encoding,

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

				flipY: this.flipY,

				premultiplyAlpha: this.premultiplyAlpha,
				unpackAlignment: this.unpackAlignment

			};

			if ( this.image !== undefined ) {

				// TODO: Move to THREE.Image

				var image = this.image;

				if ( image.uuid === undefined ) {

					image.uuid = MathUtils.generateUUID(); // UGH

				}

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

					var url;

					if ( Array.isArray( image ) ) {

						// process array of images e.g. CubeTexture

						url = [];

						for ( var i = 0, l = image.length; i < l; i ++ ) {

							url.push( ImageUtils.getDataURL( image[ i ] ) );

						}

					} else {

						// process single image

						url = ImageUtils.getDataURL( image );

					}

					meta.images[ image.uuid ] = {
						uuid: image.uuid,
						url: url
					};

				}

				output.image = image.uuid;

			}

			if ( ! isRootObject ) {

				meta.textures[ this.uuid ] = output;

			}

			return output;

		},

		dispose: function () {

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

		},

		transformUv: function ( 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;

		}

	} );

	Object.defineProperty( Texture.prototype, "needsUpdate", {

		set: function ( value ) {

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

		}

	} );

	/**
	 * @author supereggbert / http://www.paulbrunt.co.uk/
	 * @author philogb / http://blog.thejit.org/
	 * @author mikael emtinger / http://gomo.se/
	 * @author egraether / http://egraether.com/
	 * @author WestLangley / http://github.com/WestLangley
	 */

	function Vector4( x, y, z, w ) {

		this.x = x || 0;
		this.y = y || 0;
		this.z = z || 0;
		this.w = ( w !== undefined ) ? w : 1;

	}

	Object.defineProperties( Vector4.prototype, {

		"width": {

			get: function () {

				return this.z;

			},

			set: function ( value ) {

				this.z = value;

			}

		},

		"height": {

			get: function () {

				return this.w;

			},

			set: function ( value ) {

				this.w = value;

			}

		}

	} );

	Object.assign( Vector4.prototype, {

		isVector4: true,

		set: function ( x, y, z, w ) {

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

			return this;

		},

		setScalar: function ( scalar ) {

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

			return this;

		},

		setX: function ( x ) {

			this.x = x;

			return this;

		},

		setY: function ( y ) {

			this.y = y;

			return this;

		},

		setZ: function ( z ) {

			this.z = z;

			return this;

		},

		setW: function ( w ) {

			this.w = w;

			return this;

		},

		setComponent: function ( 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: function ( 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: function () {

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

		},

		copy: function ( v ) {

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

			return this;

		},

		add: function ( v, w ) {

			if ( w !== undefined ) {

				console.warn( 'THREE.Vector4: .add() now only accepts one argument. Use .addVectors( a, b ) instead.' );
				return this.addVectors( v, w );

			}

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

			return this;

		},

		addScalar: function ( s ) {

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

			return this;

		},

		addVectors: function ( 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: function ( 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: function ( v, w ) {

			if ( w !== undefined ) {

				console.warn( 'THREE.Vector4: .sub() now only accepts one argument. Use .subVectors( a, b ) instead.' );
				return this.subVectors( v, w );

			}

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

			return this;

		},

		subScalar: function ( s ) {

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

			return this;

		},

		subVectors: function ( 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;

		},

		multiplyScalar: function ( scalar ) {

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

			return this;

		},

		applyMatrix4: function ( m ) {

			var x = this.x, y = this.y, z = this.z, w = this.w;
			var 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: function ( scalar ) {

			return this.multiplyScalar( 1 / scalar );

		},

		setAxisAngleFromQuaternion: function ( 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 );

			var 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: function ( 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)

			var angle, x, y, z,		// variables for result
				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;

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

			var 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;

		},

		min: function ( 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: function ( 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: function ( 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: function ( 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: function ( min, max ) {

			var length = this.length();

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

		},

		floor: function () {

			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: function () {

			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: function () {

			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: function () {

			this.x = ( this.x < 0 ) ? Math.ceil( this.x ) : Math.floor( this.x );
			this.y = ( this.y < 0 ) ? Math.ceil( this.y ) : Math.floor( this.y );
			this.z = ( this.z < 0 ) ? Math.ceil( this.z ) : Math.floor( this.z );
			this.w = ( this.w < 0 ) ? Math.ceil( this.w ) : Math.floor( this.w );

			return this;

		},

		negate: function () {

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

			return this;

		},

		dot: function ( v ) {

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

		},

		lengthSq: function () {

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

		},

		length: function () {

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

		},

		manhattanLength: function () {

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

		},

		normalize: function () {

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

		},

		setLength: function ( length ) {

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

		},

		lerp: function ( 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: function ( v1, v2, alpha ) {

			return this.subVectors( v2, v1 ).multiplyScalar( alpha ).add( v1 );

		},

		equals: function ( v ) {

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

		},

		fromArray: function ( array, offset ) {

			if ( offset === undefined ) { offset = 0; }

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

			return this;

		},

		toArray: function ( array, offset ) {

			if ( array === undefined ) { array = []; }
			if ( offset === undefined ) { offset = 0; }

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

			return array;

		},

		fromBufferAttribute: function ( attribute, index, offset ) {

			if ( offset !== undefined ) {

				console.warn( 'THREE.Vector4: offset has been removed from .fromBufferAttribute().' );

			}

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

			return this;

		}

	} );

	/**
	 * @author szimek / https://github.com/szimek/
	 * @author alteredq / http://alteredqualia.com/
	 * @author Marius Kintel / https://github.com/kintel
	 */

	/*
	 In options, we can specify:
	 * Texture parameters for an auto-generated target texture
	 * depthBuffer/stencilBuffer: Booleans to indicate if we should generate these buffers
	*/
	function WebGLRenderTarget( width, height, options ) {

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

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

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

		options = options || {};

		this.texture = new Texture( undefined, options.mapping, options.wrapS, options.wrapT, options.magFilter, options.minFilter, options.format, options.type, options.anisotropy, options.encoding );

		this.texture.image = {};
		this.texture.image.width = width;
		this.texture.image.height = height;

		this.texture.generateMipmaps = options.generateMipmaps !== undefined ? options.generateMipmaps : false;
		this.texture.minFilter = options.minFilter !== undefined ? options.minFilter : LinearFilter;

		this.depthBuffer = options.depthBuffer !== undefined ? options.depthBuffer : true;
		this.stencilBuffer = options.stencilBuffer !== undefined ? options.stencilBuffer : true;
		this.depthTexture = options.depthTexture !== undefined ? options.depthTexture : null;

	}

	WebGLRenderTarget.prototype = Object.assign( Object.create( EventDispatcher.prototype ), {

		constructor: WebGLRenderTarget,

		isWebGLRenderTarget: true,

		setSize: function ( width, height ) {

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

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

				this.texture.image.width = width;
				this.texture.image.height = height;

				this.dispose();

			}

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

		},

		clone: function () {

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

		},

		copy: function ( source ) {

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

			this.viewport.copy( source.viewport );

			this.texture = source.texture.clone();

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

			return this;

		},

		dispose: function () {

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

		}

	} );

	/**
	 * @author Mugen87 / https://github.com/Mugen87
	 * @author Matt DesLauriers / @mattdesl
	 */

	function WebGLMultisampleRenderTarget( width, height, options ) {

		WebGLRenderTarget.call( this, width, height, options );

		this.samples = 4;

	}

	WebGLMultisampleRenderTarget.prototype = Object.assign( Object.create( WebGLRenderTarget.prototype ), {

		constructor: WebGLMultisampleRenderTarget,

		isWebGLMultisampleRenderTarget: true,

		copy: function ( source ) {

			WebGLRenderTarget.prototype.copy.call( this, source );

			this.samples = source.samples;

			return this;

		}

	} );

	/**
	 * @author mikael emtinger / http://gomo.se/
	 * @author alteredq / http://alteredqualia.com/
	 * @author WestLangley / http://github.com/WestLangley
	 * @author bhouston / http://clara.io
	 */

	function Quaternion( x, y, z, w ) {

		this._x = x || 0;
		this._y = y || 0;
		this._z = z || 0;
		this._w = ( w !== undefined ) ? w : 1;

	}

	Object.assign( Quaternion, {

		slerp: function ( qa, qb, qm, t ) {

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

		},

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

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

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

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

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

				var s = 1 - t,

					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 ) {

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

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

				}

				var 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 ) {

					var 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;

		}

	} );

	Object.defineProperties( Quaternion.prototype, {

		x: {

			get: function () {

				return this._x;

			},

			set: function ( value ) {

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

			}

		},

		y: {

			get: function () {

				return this._y;

			},

			set: function ( value ) {

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

			}

		},

		z: {

			get: function () {

				return this._z;

			},

			set: function ( value ) {

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

			}

		},

		w: {

			get: function () {

				return this._w;

			},

			set: function ( value ) {

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

			}

		}

	} );

	Object.assign( Quaternion.prototype, {

		isQuaternion: true,

		set: function ( x, y, z, w ) {

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

			this._onChangeCallback();

			return this;

		},

		clone: function () {

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

		},

		copy: function ( quaternion ) {

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

			this._onChangeCallback();

			return this;

		},

		setFromEuler: function ( euler, update ) {

			if ( ! ( euler && euler.isEuler ) ) {

				throw new Error( 'THREE.Quaternion: .setFromEuler() now expects an Euler rotation rather than a Vector3 and order.' );

			}

			var 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

			var cos = Math.cos;
			var sin = Math.sin;

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

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

			if ( order === '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;

			} else if ( order === '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;

			} else if ( order === '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;

			} else if ( order === '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;

			} else if ( order === '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;

			} else if ( order === '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;

			}

			if ( update !== false ) { this._onChangeCallback(); }

			return this;

		},

		setFromAxisAngle: function ( axis, angle ) {

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

			// assumes axis is normalized

			var 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: function ( 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)

			var 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,
				s;

			if ( trace > 0 ) {

				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 ) {

				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 ) {

				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 {

				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: function ( vFrom, vTo ) {

			// assumes direction vectors vFrom and vTo are normalized

			var EPS = 0.000001;

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

			if ( r < EPS ) {

				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: function ( q ) {

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

		},

		rotateTowards: function ( q, step ) {

			var angle = this.angleTo( q );

			if ( angle === 0 ) { return this; }

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

			this.slerp( q, t );

			return this;

		},

		inverse: function () {

			// quaternion is assumed to have unit length

			return this.conjugate();

		},

		conjugate: function () {

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

			this._onChangeCallback();

			return this;

		},

		dot: function ( v ) {

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

		},

		lengthSq: function () {

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

		},

		length: function () {

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

		},

		normalize: function () {

			var 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: function ( q, p ) {

			if ( p !== undefined ) {

				console.warn( 'THREE.Quaternion: .multiply() now only accepts one argument. Use .multiplyQuaternions( a, b ) instead.' );
				return this.multiplyQuaternions( q, p );

			}

			return this.multiplyQuaternions( this, q );

		},

		premultiply: function ( q ) {

			return this.multiplyQuaternions( q, this );

		},

		multiplyQuaternions: function ( a, b ) {

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

			var qax = a._x, qay = a._y, qaz = a._z, qaw = a._w;
			var 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: function ( qb, t ) {

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

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

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

			var 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;

			}

			var sqrSinHalfTheta = 1.0 - cosHalfTheta * cosHalfTheta;

			if ( sqrSinHalfTheta <= Number.EPSILON ) {

				var 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();
				this._onChangeCallback();

				return this;

			}

			var sinHalfTheta = Math.sqrt( sqrSinHalfTheta );
			var halfTheta = Math.atan2( sinHalfTheta, cosHalfTheta );
			var 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;

		},

		equals: function ( quaternion ) {

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

		},

		fromArray: function ( array, offset ) {

			if ( offset === undefined ) { 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: function ( array, offset ) {

			if ( array === undefined ) { array = []; }
			if ( offset === undefined ) { offset = 0; }

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

			return array;

		},

		_onChange: function ( callback ) {

			this._onChangeCallback = callback;

			return this;

		},

		_onChangeCallback: function () {}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author kile / http://kile.stravaganza.org/
	 * @author philogb / http://blog.thejit.org/
	 * @author mikael emtinger / http://gomo.se/
	 * @author egraether / http://egraether.com/
	 * @author WestLangley / http://github.com/WestLangley
	 */

	var _vector = new Vector3();
	var _quaternion = new Quaternion();

	function Vector3( x, y, z ) {

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

	}

	Object.assign( Vector3.prototype, {

		isVector3: true,

		set: function ( x, y, z ) {

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

			return this;

		},

		setScalar: function ( scalar ) {

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

			return this;

		},

		setX: function ( x ) {

			this.x = x;

			return this;

		},

		setY: function ( y ) {

			this.y = y;

			return this;

		},

		setZ: function ( z ) {

			this.z = z;

			return this;

		},

		setComponent: function ( 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: function ( 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: function () {

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

		},

		copy: function ( v ) {

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

			return this;

		},

		add: function ( v, w ) {

			if ( w !== undefined ) {

				console.warn( 'THREE.Vector3: .add() now only accepts one argument. Use .addVectors( a, b ) instead.' );
				return this.addVectors( v, w );

			}

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

			return this;

		},

		addScalar: function ( s ) {

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

			return this;

		},

		addVectors: function ( a, b ) {

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

			return this;

		},

		addScaledVector: function ( v, s ) {

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

			return this;

		},

		sub: function ( v, w ) {

			if ( w !== undefined ) {

				console.warn( 'THREE.Vector3: .sub() now only accepts one argument. Use .subVectors( a, b ) instead.' );
				return this.subVectors( v, w );

			}

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

			return this;

		},

		subScalar: function ( s ) {

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

			return this;

		},

		subVectors: function ( a, b ) {

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

			return this;

		},

		multiply: function ( v, w ) {

			if ( w !== undefined ) {

				console.warn( 'THREE.Vector3: .multiply() now only accepts one argument. Use .multiplyVectors( a, b ) instead.' );
				return this.multiplyVectors( v, w );

			}

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

			return this;

		},

		multiplyScalar: function ( scalar ) {

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

			return this;

		},

		multiplyVectors: function ( a, b ) {

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

			return this;

		},

		applyEuler: function ( euler ) {

			if ( ! ( euler && euler.isEuler ) ) {

				console.error( 'THREE.Vector3: .applyEuler() now expects an Euler rotation rather than a Vector3 and order.' );

			}

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

		},

		applyAxisAngle: function ( axis, angle ) {

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

		},

		applyMatrix3: function ( m ) {

			var x = this.x, y = this.y, z = this.z;
			var 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: function ( m ) {

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

		},

		applyMatrix4: function ( m ) {

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

			var 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: function ( q ) {

			var x = this.x, y = this.y, z = this.z;
			var qx = q.x, qy = q.y, qz = q.z, qw = q.w;

			// calculate quat * vector

			var ix = qw * x + qy * z - qz * y;
			var iy = qw * y + qz * x - qx * z;
			var iz = qw * z + qx * y - qy * x;
			var iw = - qx * x - qy * y - qz * z;

			// calculate result * inverse quat

			this.x = ix * qw + iw * - qx + iy * - qz - iz * - qy;
			this.y = iy * qw + iw * - qy + iz * - qx - ix * - qz;
			this.z = iz * qw + iw * - qz + ix * - qy - iy * - qx;

			return this;

		},

		project: function ( camera ) {

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

		},

		unproject: function ( camera ) {

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

		},

		transformDirection: function ( m ) {

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

			var x = this.x, y = this.y, z = this.z;
			var 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: function ( v ) {

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

			return this;

		},

		divideScalar: function ( scalar ) {

			return this.multiplyScalar( 1 / scalar );

		},

		min: function ( 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: function ( 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: function ( 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: function ( 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: function ( min, max ) {

			var length = this.length();

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

		},

		floor: function () {

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

			return this;

		},

		ceil: function () {

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

			return this;

		},

		round: function () {

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

			return this;

		},

		roundToZero: function () {

			this.x = ( this.x < 0 ) ? Math.ceil( this.x ) : Math.floor( this.x );
			this.y = ( this.y < 0 ) ? Math.ceil( this.y ) : Math.floor( this.y );
			this.z = ( this.z < 0 ) ? Math.ceil( this.z ) : Math.floor( this.z );

			return this;

		},

		negate: function () {

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

			return this;

		},

		dot: function ( v ) {

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

		},

		// TODO lengthSquared?

		lengthSq: function () {

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

		},

		length: function () {

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

		},

		manhattanLength: function () {

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

		},

		normalize: function () {

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

		},

		setLength: function ( length ) {

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

		},

		lerp: function ( 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: function ( v1, v2, alpha ) {

			return this.subVectors( v2, v1 ).multiplyScalar( alpha ).add( v1 );

		},

		cross: function ( v, w ) {

			if ( w !== undefined ) {

				console.warn( 'THREE.Vector3: .cross() now only accepts one argument. Use .crossVectors( a, b ) instead.' );
				return this.crossVectors( v, w );

			}

			return this.crossVectors( this, v );

		},

		crossVectors: function ( a, b ) {

			var ax = a.x, ay = a.y, az = a.z;
			var 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: function ( v ) {

			var denominator = v.lengthSq();

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

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

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

		},

		projectOnPlane: function ( planeNormal ) {

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

			return this.sub( _vector );

		},

		reflect: function ( normal ) {

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

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

		},

		angleTo: function ( v ) {

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

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

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

			// clamp, to handle numerical problems

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

		},

		distanceTo: function ( v ) {

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

		},

		distanceToSquared: function ( v ) {

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

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

		},

		manhattanDistanceTo: function ( v ) {

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

		},

		setFromSpherical: function ( s ) {

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

		},

		setFromSphericalCoords: function ( radius, phi, theta ) {

			var 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: function ( c ) {

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

		},

		setFromCylindricalCoords: function ( radius, theta, y ) {

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

			return this;

		},

		setFromMatrixPosition: function ( m ) {

			var e = m.elements;

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

			return this;

		},

		setFromMatrixScale: function ( m ) {

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

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

			return this;

		},

		setFromMatrixColumn: function ( m, index ) {

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

		},

		setFromMatrix3Column: function ( m, index ) {

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

		},

		equals: function ( v ) {

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

		},

		fromArray: function ( array, offset ) {

			if ( offset === undefined ) { offset = 0; }

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

			return this;

		},

		toArray: function ( array, offset ) {

			if ( array === undefined ) { array = []; }
			if ( offset === undefined ) { offset = 0; }

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

			return array;

		},

		fromBufferAttribute: function ( attribute, index, offset ) {

			if ( offset !== undefined ) {

				console.warn( 'THREE.Vector3: offset has been removed from .fromBufferAttribute().' );

			}

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

			return this;

		}

	} );

	var _v1 = new Vector3();
	var _m1 = new Matrix4();
	var _zero = new Vector3( 0, 0, 0 );
	var _one = new Vector3( 1, 1, 1 );
	var _x = new Vector3();
	var _y = new Vector3();
	var _z = new Vector3();

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author supereggbert / http://www.paulbrunt.co.uk/
	 * @author philogb / http://blog.thejit.org/
	 * @author jordi_ros / http://plattsoft.com
	 * @author D1plo1d / http://github.com/D1plo1d
	 * @author alteredq / http://alteredqualia.com/
	 * @author mikael emtinger / http://gomo.se/
	 * @author timknip / http://www.floorplanner.com/
	 * @author bhouston / http://clara.io
	 * @author WestLangley / http://github.com/WestLangley
	 */

	function Matrix4() {

		this.elements = [

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

		];

		if ( arguments.length > 0 ) {

			console.error( 'THREE.Matrix4: the constructor no longer reads arguments. use .set() instead.' );

		}

	}

	Object.assign( Matrix4.prototype, {

		isMatrix4: true,

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

			var 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: function () {

			this.set(

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

			);

			return this;

		},

		clone: function () {

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

		},

		copy: function ( m ) {

			var te = this.elements;
			var 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: function ( m ) {

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

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

			return this;

		},

		extractBasis: function ( xAxis, yAxis, zAxis ) {

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

			return this;

		},

		makeBasis: function ( 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: function ( m ) {

			// this method does not support reflection matrices

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

			var scaleX = 1 / _v1.setFromMatrixColumn( m, 0 ).length();
			var scaleY = 1 / _v1.setFromMatrixColumn( m, 1 ).length();
			var scaleZ = 1 / _v1.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: function ( euler ) {

			if ( ! ( euler && euler.isEuler ) ) {

				console.error( 'THREE.Matrix4: .makeRotationFromEuler() now expects a Euler rotation rather than a Vector3 and order.' );

			}

			var te = this.elements;

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

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

				var 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' ) {

				var 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' ) {

				var 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' ) {

				var 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' ) {

				var 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' ) {

				var 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: function ( q ) {

			return this.compose( _zero, q, _one );

		},

		lookAt: function ( eye, target, up ) {

			var 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: function ( m, n ) {

			if ( n !== undefined ) {

				console.warn( 'THREE.Matrix4: .multiply() now only accepts one argument. Use .multiplyMatrices( a, b ) instead.' );
				return this.multiplyMatrices( m, n );

			}

			return this.multiplyMatrices( this, m );

		},

		premultiply: function ( m ) {

			return this.multiplyMatrices( m, this );

		},

		multiplyMatrices: function ( a, b ) {

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

			var a11 = ae[ 0 ], a12 = ae[ 4 ], a13 = ae[ 8 ], a14 = ae[ 12 ];
			var a21 = ae[ 1 ], a22 = ae[ 5 ], a23 = ae[ 9 ], a24 = ae[ 13 ];
			var a31 = ae[ 2 ], a32 = ae[ 6 ], a33 = ae[ 10 ], a34 = ae[ 14 ];
			var a41 = ae[ 3 ], a42 = ae[ 7 ], a43 = ae[ 11 ], a44 = ae[ 15 ];

			var b11 = be[ 0 ], b12 = be[ 4 ], b13 = be[ 8 ], b14 = be[ 12 ];
			var b21 = be[ 1 ], b22 = be[ 5 ], b23 = be[ 9 ], b24 = be[ 13 ];
			var b31 = be[ 2 ], b32 = be[ 6 ], b33 = be[ 10 ], b34 = be[ 14 ];
			var 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: function ( s ) {

			var 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: function () {

			var te = this.elements;

			var n11 = te[ 0 ], n12 = te[ 4 ], n13 = te[ 8 ], n14 = te[ 12 ];
			var n21 = te[ 1 ], n22 = te[ 5 ], n23 = te[ 9 ], n24 = te[ 13 ];
			var n31 = te[ 2 ], n32 = te[ 6 ], n33 = te[ 10 ], n34 = te[ 14 ];
			var 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: function () {

			var te = this.elements;
			var 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: function ( x, y, z ) {

			var 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;

		},

		getInverse: function ( m, throwOnDegenerate ) {

			// based on http://www.euclideanspace.com/maths/algebra/matrix/functions/inverse/fourD/index.htm
			var te = this.elements,
				me = m.elements,

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

			var det = n11 * t11 + n21 * t12 + n31 * t13 + n41 * t14;

			if ( det === 0 ) {

				var msg = "THREE.Matrix4: .getInverse() can't invert matrix, determinant is 0";

				if ( throwOnDegenerate === true ) {

					throw new Error( msg );

				} else {

					console.warn( msg );

				}

				return this.identity();

			}

			var 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: function ( v ) {

			var te = this.elements;
			var 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: function () {

			var te = this.elements;

			var scaleXSq = te[ 0 ] * te[ 0 ] + te[ 1 ] * te[ 1 ] + te[ 2 ] * te[ 2 ];
			var scaleYSq = te[ 4 ] * te[ 4 ] + te[ 5 ] * te[ 5 ] + te[ 6 ] * te[ 6 ];
			var scaleZSq = te[ 8 ] * te[ 8 ] + te[ 9 ] * te[ 9 ] + te[ 10 ] * te[ 10 ];

			return Math.sqrt( Math.max( scaleXSq, scaleYSq, scaleZSq ) );

		},

		makeTranslation: function ( x, y, z ) {

			this.set(

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

			);

			return this;

		},

		makeRotationX: function ( theta ) {

			var 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: function ( theta ) {

			var 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: function ( theta ) {

			var 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: function ( axis, angle ) {

			// Based on http://www.gamedev.net/reference/articles/article1199.asp

			var c = Math.cos( angle );
			var s = Math.sin( angle );
			var t = 1 - c;
			var x = axis.x, y = axis.y, z = axis.z;
			var 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: function ( x, y, z ) {

			this.set(

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

			);

			return this;

		},

		makeShear: function ( x, y, z ) {

			this.set(

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

			);

			return this;

		},

		compose: function ( position, quaternion, scale ) {

			var te = this.elements;

			var x = quaternion._x, y = quaternion._y, z = quaternion._z, w = quaternion._w;
			var x2 = x + x,	y2 = y + y, z2 = z + z;
			var xx = x * x2, xy = x * y2, xz = x * z2;
			var yy = y * y2, yz = y * z2, zz = z * z2;
			var wx = w * x2, wy = w * y2, wz = w * z2;

			var 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: function ( position, quaternion, scale ) {

			var te = this.elements;

			var sx = _v1.set( te[ 0 ], te[ 1 ], te[ 2 ] ).length();
			var sy = _v1.set( te[ 4 ], te[ 5 ], te[ 6 ] ).length();
			var sz = _v1.set( te[ 8 ], te[ 9 ], te[ 10 ] ).length();

			// if determine is negative, we need to invert one scale
			var 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.copy( this );

			var invSX = 1 / sx;
			var invSY = 1 / sy;
			var invSZ = 1 / sz;

			_m1.elements[ 0 ] *= invSX;
			_m1.elements[ 1 ] *= invSX;
			_m1.elements[ 2 ] *= invSX;

			_m1.elements[ 4 ] *= invSY;
			_m1.elements[ 5 ] *= invSY;
			_m1.elements[ 6 ] *= invSY;

			_m1.elements[ 8 ] *= invSZ;
			_m1.elements[ 9 ] *= invSZ;
			_m1.elements[ 10 ] *= invSZ;

			quaternion.setFromRotationMatrix( _m1 );

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

			return this;

		},

		makePerspective: function ( left, right, top, bottom, near, far ) {

			if ( far === undefined ) {

				console.warn( 'THREE.Matrix4: .makePerspective() has been redefined and has a new signature. Please check the docs.' );

			}

			var te = this.elements;
			var x = 2 * near / ( right - left );
			var y = 2 * near / ( top - bottom );

			var a = ( right + left ) / ( right - left );
			var b = ( top + bottom ) / ( top - bottom );
			var c = - ( far + near ) / ( far - near );
			var d = - 2 * far * near / ( far - near );

			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: function ( left, right, top, bottom, near, far ) {

			var te = this.elements;
			var w = 1.0 / ( right - left );
			var h = 1.0 / ( top - bottom );
			var p = 1.0 / ( far - near );

			var x = ( right + left ) * w;
			var y = ( top + bottom ) * h;
			var z = ( far + near ) * p;

			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 ] = - 2 * p;	te[ 14 ] = - z;
			te[ 3 ] = 0;	te[ 7 ] = 0;	te[ 11 ] = 0;	te[ 15 ] = 1;

			return this;

		},

		equals: function ( matrix ) {

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

			for ( var i = 0; i < 16; i ++ ) {

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

			}

			return true;

		},

		fromArray: function ( array, offset ) {

			if ( offset === undefined ) { offset = 0; }

			for ( var i = 0; i < 16; i ++ ) {

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

			}

			return this;

		},

		toArray: function ( array, offset ) {

			if ( array === undefined ) { array = []; }
			if ( offset === undefined ) { offset = 0; }

			var 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;

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author WestLangley / http://github.com/WestLangley
	 * @author bhouston / http://clara.io
	 */

	var _matrix = new Matrix4();
	var _quaternion$1 = new Quaternion();

	function Euler( x, y, z, order ) {

		this._x = x || 0;
		this._y = y || 0;
		this._z = z || 0;
		this._order = order || Euler.DefaultOrder;

	}

	Euler.RotationOrders = [ 'XYZ', 'YZX', 'ZXY', 'XZY', 'YXZ', 'ZYX' ];

	Euler.DefaultOrder = 'XYZ';

	Object.defineProperties( Euler.prototype, {

		x: {

			get: function () {

				return this._x;

			},

			set: function ( value ) {

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

			}

		},

		y: {

			get: function () {

				return this._y;

			},

			set: function ( value ) {

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

			}

		},

		z: {

			get: function () {

				return this._z;

			},

			set: function ( value ) {

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

			}

		},

		order: {

			get: function () {

				return this._order;

			},

			set: function ( value ) {

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

			}

		}

	} );

	Object.assign( Euler.prototype, {

		isEuler: true,

		set: function ( x, y, z, order ) {

			this._x = x;
			this._y = y;
			this._z = z;
			this._order = order || this._order;

			this._onChangeCallback();

			return this;

		},

		clone: function () {

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

		},

		copy: function ( euler ) {

			this._x = euler._x;
			this._y = euler._y;
			this._z = euler._z;
			this._order = euler._order;

			this._onChangeCallback();

			return this;

		},

		setFromRotationMatrix: function ( m, order, update ) {

			var clamp = MathUtils.clamp;

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

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

			order = order || this._order;

			if ( order === 'XYZ' ) {

				this._y = Math.asin( clamp( 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;

				}

			} else if ( order === 'YXZ' ) {

				this._x = Math.asin( - clamp( 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;

				}

			} else if ( order === 'ZXY' ) {

				this._x = Math.asin( clamp( 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 );

				}

			} else if ( order === 'ZYX' ) {

				this._y = Math.asin( - clamp( 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 );

				}

			} else if ( order === 'YZX' ) {

				this._z = Math.asin( clamp( 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 );

				}

			} else if ( order === 'XZY' ) {

				this._z = Math.asin( - clamp( 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;

				}

			} else {

				console.warn( 'THREE.Euler: .setFromRotationMatrix() given unsupported order: ' + order );

			}

			this._order = order;

			if ( update !== false ) { this._onChangeCallback(); }

			return this;

		},

		setFromQuaternion: function ( q, order, update ) {

			_matrix.makeRotationFromQuaternion( q );

			return this.setFromRotationMatrix( _matrix, order, update );

		},

		setFromVector3: function ( v, order ) {

			return this.set( v.x, v.y, v.z, order || this._order );

		},

		reorder: function ( newOrder ) {

			// WARNING: this discards revolution information -bhouston

			_quaternion$1.setFromEuler( this );

			return this.setFromQuaternion( _quaternion$1, newOrder );

		},

		equals: function ( euler ) {

			return ( euler._x === this._x ) && ( euler._y === this._y ) && ( euler._z === this._z ) && ( euler._order === this._order );

		},

		fromArray: function ( 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: function ( array, offset ) {

			if ( array === undefined ) { array = []; }
			if ( offset === undefined ) { offset = 0; }

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

			return array;

		},

		toVector3: function ( optionalResult ) {

			if ( optionalResult ) {

				return optionalResult.set( this._x, this._y, this._z );

			} else {

				return new Vector3( this._x, this._y, this._z );

			}

		},

		_onChange: function ( callback ) {

			this._onChangeCallback = callback;

			return this;

		},

		_onChangeCallback: function () {}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function Layers() {

		this.mask = 1 | 0;

	}

	Object.assign( Layers.prototype, {

		set: function ( channel ) {

			this.mask = 1 << channel | 0;

		},

		enable: function ( channel ) {

			this.mask |= 1 << channel | 0;

		},

		enableAll: function () {

			this.mask = 0xffffffff | 0;

		},

		toggle: function ( channel ) {

			this.mask ^= 1 << channel | 0;

		},

		disable: function ( channel ) {

			this.mask &= ~ ( 1 << channel | 0 );

		},

		disableAll: function () {

			this.mask = 0;

		},

		test: function ( layers ) {

			return ( this.mask & layers.mask ) !== 0;

		}

	} );

	var _object3DId = 0;

	var _v1$1 = new Vector3();
	var _q1 = new Quaternion();
	var _m1$1 = new Matrix4();
	var _target = new Vector3();

	var _position = new Vector3();
	var _scale = new Vector3();
	var _quaternion$2 = new Quaternion();

	var _xAxis = new Vector3( 1, 0, 0 );
	var _yAxis = new Vector3( 0, 1, 0 );
	var _zAxis = new Vector3( 0, 0, 1 );

	var _addedEvent = { type: 'added' };
	var _removedEvent = { type: 'removed' };

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author mikael emtinger / http://gomo.se/
	 * @author alteredq / http://alteredqualia.com/
	 * @author WestLangley / http://github.com/WestLangley
	 * @author elephantatwork / www.elephantatwork.ch
	 */

	function Object3D() {

		Object.defineProperty( this, 'id', { value: _object3DId ++ } );

		this.uuid = MathUtils.generateUUID();

		this.name = '';
		this.type = 'Object3D';

		this.parent = null;
		this.children = [];

		this.up = Object3D.DefaultUp.clone();

		var position = new Vector3();
		var rotation = new Euler();
		var quaternion = new Quaternion();
		var 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.DefaultMatrixAutoUpdate;
		this.matrixWorldNeedsUpdate = false;

		this.layers = new Layers();
		this.visible = true;

		this.castShadow = false;
		this.receiveShadow = false;

		this.frustumCulled = true;
		this.renderOrder = 0;

		this.userData = {};

	}

	Object3D.DefaultUp = new Vector3( 0, 1, 0 );
	Object3D.DefaultMatrixAutoUpdate = true;

	Object3D.prototype = Object.assign( Object.create( EventDispatcher.prototype ), {

		constructor: Object3D,

		isObject3D: true,

		onBeforeRender: function () {},
		onAfterRender: function () {},

		applyMatrix4: function ( matrix ) {

			if ( this.matrixAutoUpdate ) { this.updateMatrix(); }

			this.matrix.premultiply( matrix );

			this.matrix.decompose( this.position, this.quaternion, this.scale );

		},

		applyQuaternion: function ( q ) {

			this.quaternion.premultiply( q );

			return this;

		},

		setRotationFromAxisAngle: function ( axis, angle ) {

			// assumes axis is normalized

			this.quaternion.setFromAxisAngle( axis, angle );

		},

		setRotationFromEuler: function ( euler ) {

			this.quaternion.setFromEuler( euler, true );

		},

		setRotationFromMatrix: function ( m ) {

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

			this.quaternion.setFromRotationMatrix( m );

		},

		setRotationFromQuaternion: function ( q ) {

			// assumes q is normalized

			this.quaternion.copy( q );

		},

		rotateOnAxis: function ( 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: function ( 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: function ( angle ) {

			return this.rotateOnAxis( _xAxis, angle );

		},

		rotateY: function ( angle ) {

			return this.rotateOnAxis( _yAxis, angle );

		},

		rotateZ: function ( angle ) {

			return this.rotateOnAxis( _zAxis, angle );

		},

		translateOnAxis: function ( axis, distance ) {

			// translate object by distance along axis in object space
			// axis is assumed to be normalized

			_v1$1.copy( axis ).applyQuaternion( this.quaternion );

			this.position.add( _v1$1.multiplyScalar( distance ) );

			return this;

		},

		translateX: function ( distance ) {

			return this.translateOnAxis( _xAxis, distance );

		},

		translateY: function ( distance ) {

			return this.translateOnAxis( _yAxis, distance );

		},

		translateZ: function ( distance ) {

			return this.translateOnAxis( _zAxis, distance );

		},

		localToWorld: function ( vector ) {

			return vector.applyMatrix4( this.matrixWorld );

		},

		worldToLocal: function ( vector ) {

			return vector.applyMatrix4( _m1$1.getInverse( this.matrixWorld ) );

		},

		lookAt: function ( x, y, z ) {

			// This method does not support objects having non-uniformly-scaled parent(s)

			if ( x.isVector3 ) {

				_target.copy( x );

			} else {

				_target.set( x, y, z );

			}

			var parent = this.parent;

			this.updateWorldMatrix( true, false );

			_position.setFromMatrixPosition( this.matrixWorld );

			if ( this.isCamera || this.isLight ) {

				_m1$1.lookAt( _position, _target, this.up );

			} else {

				_m1$1.lookAt( _target, _position, this.up );

			}

			this.quaternion.setFromRotationMatrix( _m1$1 );

			if ( parent ) {

				_m1$1.extractRotation( parent.matrixWorld );
				_q1.setFromRotationMatrix( _m1$1 );
				this.quaternion.premultiply( _q1.inverse() );

			}

		},

		add: function ( object ) {

			if ( arguments.length > 1 ) {

				for ( var 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 ) ) {

				if ( object.parent !== null ) {

					object.parent.remove( object );

				}

				object.parent = this;
				this.children.push( object );

				object.dispatchEvent( _addedEvent );

			} else {

				console.error( "THREE.Object3D.add: object not an instance of THREE.Object3D.", object );

			}

			return this;

		},

		remove: function ( object ) {

			if ( arguments.length > 1 ) {

				for ( var i = 0; i < arguments.length; i ++ ) {

					this.remove( arguments[ i ] );

				}

				return this;

			}

			var index = this.children.indexOf( object );

			if ( index !== - 1 ) {

				object.parent = null;
				this.children.splice( index, 1 );

				object.dispatchEvent( _removedEvent );

			}

			return this;

		},

		attach: function ( object ) {

			// adds object as a child of this, while maintaining the object's world transform

			this.updateWorldMatrix( true, false );

			_m1$1.getInverse( this.matrixWorld );

			if ( object.parent !== null ) {

				object.parent.updateWorldMatrix( true, false );

				_m1$1.multiply( object.parent.matrixWorld );

			}

			object.applyMatrix4( _m1$1 );

			object.updateWorldMatrix( false, false );

			this.add( object );

			return this;

		},

		getObjectById: function ( id ) {

			return this.getObjectByProperty( 'id', id );

		},

		getObjectByName: function ( name ) {

			return this.getObjectByProperty( 'name', name );

		},

		getObjectByProperty: function ( name, value ) {

			if ( this[ name ] === value ) { return this; }

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

				var child = this.children[ i ];
				var object = child.getObjectByProperty( name, value );

				if ( object !== undefined ) {

					return object;

				}

			}

			return undefined;

		},

		getWorldPosition: function ( target ) {

			if ( target === undefined ) {

				console.warn( 'THREE.Object3D: .getWorldPosition() target is now required' );
				target = new Vector3();

			}

			this.updateMatrixWorld( true );

			return target.setFromMatrixPosition( this.matrixWorld );

		},

		getWorldQuaternion: function ( target ) {

			if ( target === undefined ) {

				console.warn( 'THREE.Object3D: .getWorldQuaternion() target is now required' );
				target = new Quaternion();

			}

			this.updateMatrixWorld( true );

			this.matrixWorld.decompose( _position, target, _scale );

			return target;

		},

		getWorldScale: function ( target ) {

			if ( target === undefined ) {

				console.warn( 'THREE.Object3D: .getWorldScale() target is now required' );
				target = new Vector3();

			}

			this.updateMatrixWorld( true );

			this.matrixWorld.decompose( _position, _quaternion$2, target );

			return target;

		},

		getWorldDirection: function ( target ) {

			if ( target === undefined ) {

				console.warn( 'THREE.Object3D: .getWorldDirection() target is now required' );
				target = new Vector3();

			}

			this.updateMatrixWorld( true );

			var e = this.matrixWorld.elements;

			return target.set( e[ 8 ], e[ 9 ], e[ 10 ] ).normalize();

		},

		raycast: function () {},

		traverse: function ( callback ) {

			callback( this );

			var children = this.children;

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

				children[ i ].traverse( callback );

			}

		},

		traverseVisible: function ( callback ) {

			if ( this.visible === false ) { return; }

			callback( this );

			var children = this.children;

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

				children[ i ].traverseVisible( callback );

			}

		},

		traverseAncestors: function ( callback ) {

			var parent = this.parent;

			if ( parent !== null ) {

				callback( parent );

				parent.traverseAncestors( callback );

			}

		},

		updateMatrix: function () {

			this.matrix.compose( this.position, this.quaternion, this.scale );

			this.matrixWorldNeedsUpdate = true;

		},

		updateMatrixWorld: function ( force ) {

			if ( this.matrixAutoUpdate ) { this.updateMatrix(); }

			if ( this.matrixWorldNeedsUpdate || force ) {

				if ( this.parent === null ) {

					this.matrixWorld.copy( this.matrix );

				} else {

					this.matrixWorld.multiplyMatrices( this.parent.matrixWorld, this.matrix );

				}

				this.matrixWorldNeedsUpdate = false;

				force = true;

			}

			// update children

			var children = this.children;

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

				children[ i ].updateMatrixWorld( force );

			}

		},

		updateWorldMatrix: function ( updateParents, updateChildren ) {

			var parent = this.parent;

			if ( updateParents === true && parent !== null ) {

				parent.updateWorldMatrix( true, false );

			}

			if ( this.matrixAutoUpdate ) { this.updateMatrix(); }

			if ( this.parent === null ) {

				this.matrixWorld.copy( this.matrix );

			} else {

				this.matrixWorld.multiplyMatrices( this.parent.matrixWorld, this.matrix );

			}

			// update children

			if ( updateChildren === true ) {

				var children = this.children;

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

					children[ i ].updateWorldMatrix( false, true );

				}

			}

		},

		toJSON: function ( meta ) {

			// meta is a string when called from JSON.stringify
			var isRootObject = ( meta === undefined || typeof meta === 'string' );

			var 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: {}
				};

				output.metadata = {
					version: 4.5,
					type: 'Object',
					generator: 'Object3D.toJSON'
				};

			}

			// standard Object3D serialization

			var 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 ( JSON.stringify( this.userData ) !== '{}' ) { object.userData = this.userData; }

			object.layers = this.layers.mask;
			object.matrix = this.matrix.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();

			}

			//

			function serialize( library, element ) {

				if ( library[ element.uuid ] === undefined ) {

					library[ element.uuid ] = element.toJSON( meta );

				}

				return element.uuid;

			}

			if ( this.isMesh || this.isLine || this.isPoints ) {

				object.geometry = serialize( meta.geometries, this.geometry );

				var parameters = this.geometry.parameters;

				if ( parameters !== undefined && parameters.shapes !== undefined ) {

					var shapes = parameters.shapes;

					if ( Array.isArray( shapes ) ) {

						for ( var i = 0, l = shapes.length; i < l; i ++ ) {

							var shape = shapes[ i ];

							serialize( meta.shapes, shape );

						}

					} else {

						serialize( meta.shapes, shapes );

					}

				}

			}

			if ( this.material !== undefined ) {

				if ( Array.isArray( this.material ) ) {

					var uuids = [];

					for ( var 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 ( var i = 0; i < this.children.length; i ++ ) {

					object.children.push( this.children[ i ].toJSON( meta ).object );

				}

			}

			if ( isRootObject ) {

				var geometries = extractFromCache( meta.geometries );
				var materials = extractFromCache( meta.materials );
				var textures = extractFromCache( meta.textures );
				var images = extractFromCache( meta.images );
				var shapes = extractFromCache( meta.shapes );

				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; }

			}

			output.object = object;

			return output;

			// extract data from the cache hash
			// remove metadata on each item
			// and return as array
			function extractFromCache( cache ) {

				var values = [];
				for ( var key in cache ) {

					var data = cache[ key ];
					delete data.metadata;
					values.push( data );

				}
				return values;

			}

		},

		clone: function ( recursive ) {

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

		},

		copy: function ( source, recursive ) {

			if ( recursive === undefined ) { recursive = true; }

			this.name = source.name;

			this.up.copy( source.up );

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

			if ( recursive === true ) {

				for ( var i = 0; i < source.children.length; i ++ ) {

					var child = source.children[ i ];
					this.add( child.clone() );

				}

			}

			return this;

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function Scene() {

		Object3D.call( this );

		this.type = 'Scene';

		this.background = null;
		this.environment = null;
		this.fog = null;

		this.overrideMaterial = null;

		this.autoUpdate = true; // checked by the renderer

		if ( typeof __THREE_DEVTOOLS__ !== 'undefined' ) {

			__THREE_DEVTOOLS__.dispatchEvent( new CustomEvent( 'observe', { detail: this } ) ); // eslint-disable-line no-undef

		}

	}

	Scene.prototype = Object.assign( Object.create( Object3D.prototype ), {

		constructor: Scene,

		isScene: true,

		copy: function ( source, recursive ) {

			Object3D.prototype.copy.call( this, 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(); }

			if ( source.overrideMaterial !== null ) { this.overrideMaterial = source.overrideMaterial.clone(); }

			this.autoUpdate = source.autoUpdate;
			this.matrixAutoUpdate = source.matrixAutoUpdate;

			return this;

		},

		toJSON: function ( meta ) {

			var data = Object3D.prototype.toJSON.call( this, meta );

			if ( this.background !== null ) { data.object.background = this.background.toJSON( meta ); }
			if ( this.environment !== null ) { data.object.environment = this.environment.toJSON( meta ); }
			if ( this.fog !== null ) { data.object.fog = this.fog.toJSON(); }

			return data;

		},

		dispose: function () {

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

		}

	} );

	var _points = [
		new Vector3(),
		new Vector3(),
		new Vector3(),
		new Vector3(),
		new Vector3(),
		new Vector3(),
		new Vector3(),
		new Vector3()
	];

	var _vector$1 = new Vector3();

	var _box = new Box3();

	// triangle centered vertices

	var _v0 = new Vector3();
	var _v1$2 = new Vector3();
	var _v2 = new Vector3();

	// triangle edge vectors

	var _f0 = new Vector3();
	var _f1 = new Vector3();
	var _f2 = new Vector3();

	var _center = new Vector3();
	var _extents = new Vector3();
	var _triangleNormal = new Vector3();
	var _testAxis = new Vector3();

	/**
	 * @author bhouston / http://clara.io
	 * @author WestLangley / http://github.com/WestLangley
	 */

	function Box3( min, max ) {

		this.min = ( min !== undefined ) ? min : new Vector3( + Infinity, + Infinity, + Infinity );
		this.max = ( max !== undefined ) ? max : new Vector3( - Infinity, - Infinity, - Infinity );

	}


	Object.assign( Box3.prototype, {

		isBox3: true,

		set: function ( min, max ) {

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

			return this;

		},

		setFromArray: function ( array ) {

			var minX = + Infinity;
			var minY = + Infinity;
			var minZ = + Infinity;

			var maxX = - Infinity;
			var maxY = - Infinity;
			var maxZ = - Infinity;

			for ( var i = 0, l = array.length; i < l; i += 3 ) {

				var x = array[ i ];
				var y = array[ i + 1 ];
				var z = array[ i + 2 ];

				if ( x < minX ) { minX = x; }
				if ( y < minY ) { minY = y; }
				if ( z < minZ ) { minZ = z; }

				if ( x > maxX ) { maxX = x; }
				if ( y > maxY ) { maxY = y; }
				if ( z > maxZ ) { maxZ = z; }

			}

			this.min.set( minX, minY, minZ );
			this.max.set( maxX, maxY, maxZ );

			return this;

		},

		setFromBufferAttribute: function ( attribute ) {

			var minX = + Infinity;
			var minY = + Infinity;
			var minZ = + Infinity;

			var maxX = - Infinity;
			var maxY = - Infinity;
			var maxZ = - Infinity;

			for ( var i = 0, l = attribute.count; i < l; i ++ ) {

				var x = attribute.getX( i );
				var y = attribute.getY( i );
				var z = attribute.getZ( i );

				if ( x < minX ) { minX = x; }
				if ( y < minY ) { minY = y; }
				if ( z < minZ ) { minZ = z; }

				if ( x > maxX ) { maxX = x; }
				if ( y > maxY ) { maxY = y; }
				if ( z > maxZ ) { maxZ = z; }

			}

			this.min.set( minX, minY, minZ );
			this.max.set( maxX, maxY, maxZ );

			return this;

		},

		setFromPoints: function ( points ) {

			this.makeEmpty();

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

				this.expandByPoint( points[ i ] );

			}

			return this;

		},

		setFromCenterAndSize: function ( center, size ) {

			var halfSize = _vector$1.copy( size ).multiplyScalar( 0.5 );

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

			return this;

		},

		setFromObject: function ( object ) {

			this.makeEmpty();

			return this.expandByObject( object );

		},

		clone: function () {

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

		},

		copy: function ( box ) {

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

			return this;

		},

		makeEmpty: function () {

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

			return this;

		},

		isEmpty: function () {

			// 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: function ( target ) {

			if ( target === undefined ) {

				console.warn( 'THREE.Box3: .getCenter() target is now required' );
				target = new Vector3();

			}

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

		},

		getSize: function ( target ) {

			if ( target === undefined ) {

				console.warn( 'THREE.Box3: .getSize() target is now required' );
				target = new Vector3();

			}

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

		},

		expandByPoint: function ( point ) {

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

			return this;

		},

		expandByVector: function ( vector ) {

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

			return this;

		},

		expandByScalar: function ( scalar ) {

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

			return this;

		},

		expandByObject: function ( object ) {

			// 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 );

			var geometry = object.geometry;

			if ( geometry !== undefined ) {

				if ( geometry.boundingBox === null ) {

					geometry.computeBoundingBox();

				}

				_box.copy( geometry.boundingBox );
				_box.applyMatrix4( object.matrixWorld );

				this.expandByPoint( _box.min );
				this.expandByPoint( _box.max );

			}

			var children = object.children;

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

				this.expandByObject( children[ i ] );

			}

			return this;

		},

		containsPoint: function ( 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: function ( 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: function ( point, target ) {

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

			if ( target === undefined ) {

				console.warn( 'THREE.Box3: .getParameter() target is now required' );
				target = new Vector3();

			}

			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: function ( 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: function ( sphere ) {

			// Find the point on the AABB closest to the sphere center.
			this.clampPoint( sphere.center, _vector$1 );

			// If that point is inside the sphere, the AABB and sphere intersect.
			return _vector$1.distanceToSquared( sphere.center ) <= ( sphere.radius * sphere.radius );

		},

		intersectsPlane: function ( 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.

			var 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: function ( 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.subVectors( triangle.a, _center );
			_v1$2.subVectors( triangle.b, _center );
			_v2.subVectors( triangle.c, _center );

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

			// 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)
			var 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, _v1$2, _v2, _extents ) ) {

				return false;

			}

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

		},

		clampPoint: function ( point, target ) {

			if ( target === undefined ) {

				console.warn( 'THREE.Box3: .clampPoint() target is now required' );
				target = new Vector3();

			}

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

		},

		distanceToPoint: function ( point ) {

			var clampedPoint = _vector$1.copy( point ).clamp( this.min, this.max );

			return clampedPoint.sub( point ).length();

		},

		getBoundingSphere: function ( target ) {

			if ( target === undefined ) {

				console.error( 'THREE.Box3: .getBoundingSphere() target is now required' );
				//target = new Sphere(); // removed to avoid cyclic dependency

			}

			this.getCenter( target.center );

			target.radius = this.getSize( _vector$1 ).length() * 0.5;

			return target;

		},

		intersect: function ( 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: function ( box ) {

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

			return this;

		},

		applyMatrix4: function ( 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: function ( offset ) {

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

			return this;

		},

		equals: function ( box ) {

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

		}

	} );

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

		var i, j;

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

			_testAxis.fromArray( axes, i );
			// project the aabb onto the seperating axis
			var 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 seperating axis
			var p0 = v0.dot( _testAxis );
			var p1 = v1.dot( _testAxis );
			var 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 seperating and we can exit
				return false;

			}

		}

		return true;

	}

	var _box$1 = new Box3();

	/**
	 * @author bhouston / http://clara.io
	 * @author mrdoob / http://mrdoob.com/
	 */

	function Sphere( center, radius ) {

		this.center = ( center !== undefined ) ? center : new Vector3();
		this.radius = ( radius !== undefined ) ? radius : 0;

	}

	Object.assign( Sphere.prototype, {

		set: function ( center, radius ) {

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

			return this;

		},

		setFromPoints: function ( points, optionalCenter ) {

			var center = this.center;

			if ( optionalCenter !== undefined ) {

				center.copy( optionalCenter );

			} else {

				_box$1.setFromPoints( points ).getCenter( center );

			}

			var maxRadiusSq = 0;

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

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

			}

			this.radius = Math.sqrt( maxRadiusSq );

			return this;

		},

		clone: function () {

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

		},

		copy: function ( sphere ) {

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

			return this;

		},

		empty: function () {

			return ( this.radius <= 0 );

		},

		containsPoint: function ( point ) {

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

		},

		distanceToPoint: function ( point ) {

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

		},

		intersectsSphere: function ( sphere ) {

			var radiusSum = this.radius + sphere.radius;

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

		},

		intersectsBox: function ( box ) {

			return box.intersectsSphere( this );

		},

		intersectsPlane: function ( plane ) {

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

		},

		clampPoint: function ( point, target ) {

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

			if ( target === undefined ) {

				console.warn( 'THREE.Sphere: .clampPoint() target is now required' );
				target = new Vector3();

			}

			target.copy( point );

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

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

			}

			return target;

		},

		getBoundingBox: function ( target ) {

			if ( target === undefined ) {

				console.warn( 'THREE.Sphere: .getBoundingBox() target is now required' );
				target = new Box3();

			}

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

			return target;

		},

		applyMatrix4: function ( matrix ) {

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

			return this;

		},

		translate: function ( offset ) {

			this.center.add( offset );

			return this;

		},

		equals: function ( sphere ) {

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

		}

	} );

	var _vector$2 = new Vector3();
	var _segCenter = new Vector3();
	var _segDir = new Vector3();
	var _diff = new Vector3();

	var _edge1 = new Vector3();
	var _edge2 = new Vector3();
	var _normal = new Vector3();

	/**
	 * @author bhouston / http://clara.io
	 */

	function Ray( origin, direction ) {

		this.origin = ( origin !== undefined ) ? origin : new Vector3();
		this.direction = ( direction !== undefined ) ? direction : new Vector3( 0, 0, - 1 );

	}

	Object.assign( Ray.prototype, {

		set: function ( origin, direction ) {

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

			return this;

		},

		clone: function () {

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

		},

		copy: function ( ray ) {

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

			return this;

		},

		at: function ( t, target ) {

			if ( target === undefined ) {

				console.warn( 'THREE.Ray: .at() target is now required' );
				target = new Vector3();

			}

			return target.copy( this.direction ).multiplyScalar( t ).add( this.origin );

		},

		lookAt: function ( v ) {

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

			return this;

		},

		recast: function ( t ) {

			this.origin.copy( this.at( t, _vector$2 ) );

			return this;

		},

		closestPointToPoint: function ( point, target ) {

			if ( target === undefined ) {

				console.warn( 'THREE.Ray: .closestPointToPoint() target is now required' );
				target = new Vector3();

			}

			target.subVectors( point, this.origin );

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

			if ( directionDistance < 0 ) {

				return target.copy( this.origin );

			}

			return target.copy( this.direction ).multiplyScalar( directionDistance ).add( this.origin );

		},

		distanceToPoint: function ( point ) {

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

		},

		distanceSqToPoint: function ( point ) {

			var directionDistance = _vector$2.subVectors( point, this.origin ).dot( this.direction );

			// point behind the ray

			if ( directionDistance < 0 ) {

				return this.origin.distanceToSquared( point );

			}

			_vector$2.copy( this.direction ).multiplyScalar( directionDistance ).add( this.origin );

			return _vector$2.distanceToSquared( point );

		},

		distanceSqToSegment: function ( v0, v1, optionalPointOnRay, optionalPointOnSegment ) {

			// from http://www.geometrictools.com/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 );

			var segExtent = v0.distanceTo( v1 ) * 0.5;
			var a01 = - this.direction.dot( _segDir );
			var b0 = _diff.dot( this.direction );
			var b1 = - _diff.dot( _segDir );
			var c = _diff.lengthSq();
			var det = Math.abs( 1 - a01 * a01 );
			var 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.

							var 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.direction ).multiplyScalar( s0 ).add( this.origin );

			}

			if ( optionalPointOnSegment ) {

				optionalPointOnSegment.copy( _segDir ).multiplyScalar( s1 ).add( _segCenter );

			}

			return sqrDist;

		},

		intersectSphere: function ( sphere, target ) {

			_vector$2.subVectors( sphere.center, this.origin );
			var tca = _vector$2.dot( this.direction );
			var d2 = _vector$2.dot( _vector$2 ) - tca * tca;
			var radius2 = sphere.radius * sphere.radius;

			if ( d2 > radius2 ) { return null; }

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

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

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

			// test to see if both t0 and t1 are behind the ray - if so, return null
			if ( t0 < 0 && 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: function ( sphere ) {

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

		},

		distanceToPlane: function ( plane ) {

			var 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;

			}

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

			// Return if the ray never intersects the plane

			return t >= 0 ? t : null;

		},

		intersectPlane: function ( plane, target ) {

			var t = this.distanceToPlane( plane );

			if ( t === null ) {

				return null;

			}

			return this.at( t, target );

		},

		intersectsPlane: function ( plane ) {

			// check if the ray lies on the plane first

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

			if ( distToPoint === 0 ) {

				return true;

			}

			var 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: function ( box, target ) {

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

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

			var 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; }

			// These lines also handle the case where tmin or tmax is NaN
			// (result of 0 * Infinity). x !== x returns true if x is NaN

			if ( tymin > tmin || tmin !== tmin ) { tmin = tymin; }

			if ( tymax < tmax || tmax !== 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: function ( box ) {

			return this.intersectBox( box, _vector$2 ) !== null;

		},

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

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

			// from http://www.geometrictools.com/GTEngine/Include/Mathematics/GteIntrRay3Triangle3.h

			_edge1.subVectors( b, a );
			_edge2.subVectors( c, a );
			_normal.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)
			var DdN = this.direction.dot( _normal );
			var 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 );
			var DdQxE2 = sign * this.direction.dot( _edge2.crossVectors( _diff, _edge2 ) );

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

				return null;

			}

			var 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.
			var QdN = - sign * _diff.dot( _normal );

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

				return null;

			}

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

		},

		applyMatrix4: function ( matrix4 ) {

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

			return this;

		},

		equals: function ( ray ) {

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

		}

	} );

	/**
	 * @author bhouston / http://clara.io
	 */

	var _vector1 = new Vector3();
	var _vector2 = new Vector3();
	var _normalMatrix = new Matrix3();

	function Plane( normal, constant ) {

		// normal is assumed to be normalized

		this.normal = ( normal !== undefined ) ? normal : new Vector3( 1, 0, 0 );
		this.constant = ( constant !== undefined ) ? constant : 0;

	}

	Object.assign( Plane.prototype, {

		isPlane: true,

		set: function ( normal, constant ) {

			this.normal.copy( normal );
			this.constant = constant;

			return this;

		},

		setComponents: function ( x, y, z, w ) {

			this.normal.set( x, y, z );
			this.constant = w;

			return this;

		},

		setFromNormalAndCoplanarPoint: function ( normal, point ) {

			this.normal.copy( normal );
			this.constant = - point.dot( this.normal );

			return this;

		},

		setFromCoplanarPoints: function ( a, b, c ) {

			var 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;

		},

		clone: function () {

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

		},

		copy: function ( plane ) {

			this.normal.copy( plane.normal );
			this.constant = plane.constant;

			return this;

		},

		normalize: function () {

			// Note: will lead to a divide by zero if the plane is invalid.

			var inverseNormalLength = 1.0 / this.normal.length();
			this.normal.multiplyScalar( inverseNormalLength );
			this.constant *= inverseNormalLength;

			return this;

		},

		negate: function () {

			this.constant *= - 1;
			this.normal.negate();

			return this;

		},

		distanceToPoint: function ( point ) {

			return this.normal.dot( point ) + this.constant;

		},

		distanceToSphere: function ( sphere ) {

			return this.distanceToPoint( sphere.center ) - sphere.radius;

		},

		projectPoint: function ( point, target ) {

			if ( target === undefined ) {

				console.warn( 'THREE.Plane: .projectPoint() target is now required' );
				target = new Vector3();

			}

			return target.copy( this.normal ).multiplyScalar( - this.distanceToPoint( point ) ).add( point );

		},

		intersectLine: function ( line, target ) {

			if ( target === undefined ) {

				console.warn( 'THREE.Plane: .intersectLine() target is now required' );
				target = new Vector3();

			}

			var direction = line.delta( _vector1 );

			var 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 undefined;

			}

			var t = - ( line.start.dot( this.normal ) + this.constant ) / denominator;

			if ( t < 0 || t > 1 ) {

				return undefined;

			}

			return target.copy( direction ).multiplyScalar( t ).add( line.start );

		},

		intersectsLine: function ( line ) {

			// Note: this tests if a line intersects the plane, not whether it (or its end-points) are coplanar with it.

			var startSign = this.distanceToPoint( line.start );
			var endSign = this.distanceToPoint( line.end );

			return ( startSign < 0 && endSign > 0 ) || ( endSign < 0 && startSign > 0 );

		},

		intersectsBox: function ( box ) {

			return box.intersectsPlane( this );

		},

		intersectsSphere: function ( sphere ) {

			return sphere.intersectsPlane( this );

		},

		coplanarPoint: function ( target ) {

			if ( target === undefined ) {

				console.warn( 'THREE.Plane: .coplanarPoint() target is now required' );
				target = new Vector3();

			}

			return target.copy( this.normal ).multiplyScalar( - this.constant );

		},

		applyMatrix4: function ( matrix, optionalNormalMatrix ) {

			var normalMatrix = optionalNormalMatrix || _normalMatrix.getNormalMatrix( matrix );

			var referencePoint = this.coplanarPoint( _vector1 ).applyMatrix4( matrix );

			var normal = this.normal.applyMatrix3( normalMatrix ).normalize();

			this.constant = - referencePoint.dot( normal );

			return this;

		},

		translate: function ( offset ) {

			this.constant -= offset.dot( this.normal );

			return this;

		},

		equals: function ( plane ) {

			return plane.normal.equals( this.normal ) && ( plane.constant === this.constant );

		}

	} );

	/**
	 * @author bhouston / http://clara.io
	 * @author mrdoob / http://mrdoob.com/
	 */

	var _v0$1 = new Vector3();
	var _v1$3 = new Vector3();
	var _v2$1 = new Vector3();
	var _v3 = new Vector3();

	var _vab = new Vector3();
	var _vac = new Vector3();
	var _vbc = new Vector3();
	var _vap = new Vector3();
	var _vbp = new Vector3();
	var _vcp = new Vector3();

	function Triangle( a, b, c ) {

		this.a = ( a !== undefined ) ? a : new Vector3();
		this.b = ( b !== undefined ) ? b : new Vector3();
		this.c = ( c !== undefined ) ? c : new Vector3();

	}

	Object.assign( Triangle, {

		getNormal: function ( a, b, c, target ) {

			if ( target === undefined ) {

				console.warn( 'THREE.Triangle: .getNormal() target is now required' );
				target = new Vector3();

			}

			target.subVectors( c, b );
			_v0$1.subVectors( a, b );
			target.cross( _v0$1 );

			var 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
		getBarycoord: function ( point, a, b, c, target ) {

			_v0$1.subVectors( c, a );
			_v1$3.subVectors( b, a );
			_v2$1.subVectors( point, a );

			var dot00 = _v0$1.dot( _v0$1 );
			var dot01 = _v0$1.dot( _v1$3 );
			var dot02 = _v0$1.dot( _v2$1 );
			var dot11 = _v1$3.dot( _v1$3 );
			var dot12 = _v1$3.dot( _v2$1 );

			var denom = ( dot00 * dot11 - dot01 * dot01 );

			if ( target === undefined ) {

				console.warn( 'THREE.Triangle: .getBarycoord() target is now required' );
				target = new Vector3();

			}

			// collinear or singular triangle
			if ( denom === 0 ) {

				// arbitrary location outside of triangle?
				// not sure if this is the best idea, maybe should be returning undefined
				return target.set( - 2, - 1, - 1 );

			}

			var invDenom = 1 / denom;
			var u = ( dot11 * dot02 - dot01 * dot12 ) * invDenom;
			var v = ( dot00 * dot12 - dot01 * dot02 ) * invDenom;

			// barycentric coordinates must always sum to 1
			return target.set( 1 - u - v, v, u );

		},

		containsPoint: function ( point, a, b, c ) {

			Triangle.getBarycoord( point, a, b, c, _v3 );

			return ( _v3.x >= 0 ) && ( _v3.y >= 0 ) && ( ( _v3.x + _v3.y ) <= 1 );

		},

		getUV: function ( point, p1, p2, p3, uv1, uv2, uv3, target ) {

			this.getBarycoord( point, p1, p2, p3, _v3 );

			target.set( 0, 0 );
			target.addScaledVector( uv1, _v3.x );
			target.addScaledVector( uv2, _v3.y );
			target.addScaledVector( uv3, _v3.z );

			return target;

		},

		isFrontFacing: function ( 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;

		}

	} );

	Object.assign( Triangle.prototype, {

		set: function ( a, b, c ) {

			this.a.copy( a );
			this.b.copy( b );
			this.c.copy( c );

			return this;

		},

		setFromPointsAndIndices: function ( points, i0, i1, i2 ) {

			this.a.copy( points[ i0 ] );
			this.b.copy( points[ i1 ] );
			this.c.copy( points[ i2 ] );

			return this;

		},

		clone: function () {

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

		},

		copy: function ( triangle ) {

			this.a.copy( triangle.a );
			this.b.copy( triangle.b );
			this.c.copy( triangle.c );

			return this;

		},

		getArea: function () {

			_v0$1.subVectors( this.c, this.b );
			_v1$3.subVectors( this.a, this.b );

			return _v0$1.cross( _v1$3 ).length() * 0.5;

		},

		getMidpoint: function ( target ) {

			if ( target === undefined ) {

				console.warn( 'THREE.Triangle: .getMidpoint() target is now required' );
				target = new Vector3();

			}

			return target.addVectors( this.a, this.b ).add( this.c ).multiplyScalar( 1 / 3 );

		},

		getNormal: function ( target ) {

			return Triangle.getNormal( this.a, this.b, this.c, target );

		},

		getPlane: function ( target ) {

			if ( target === undefined ) {

				console.warn( 'THREE.Triangle: .getPlane() target is now required' );
				target = new Plane();

			}

			return target.setFromCoplanarPoints( this.a, this.b, this.c );

		},

		getBarycoord: function ( point, target ) {

			return Triangle.getBarycoord( point, this.a, this.b, this.c, target );

		},

		getUV: function ( point, uv1, uv2, uv3, target ) {

			return Triangle.getUV( point, this.a, this.b, this.c, uv1, uv2, uv3, target );

		},

		containsPoint: function ( point ) {

			return Triangle.containsPoint( point, this.a, this.b, this.c );

		},

		isFrontFacing: function ( direction ) {

			return Triangle.isFrontFacing( this.a, this.b, this.c, direction );

		},

		intersectsBox: function ( box ) {

			return box.intersectsTriangle( this );

		},

		closestPointToPoint: function ( p, target ) {

			if ( target === undefined ) {

				console.warn( 'THREE.Triangle: .closestPointToPoint() target is now required' );
				target = new Vector3();

			}

			var a = this.a, b = this.b, c = this.c;
			var 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 );
			var d1 = _vab.dot( _vap );
			var 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 );
			var d3 = _vab.dot( _vbp );
			var d4 = _vac.dot( _vbp );
			if ( d3 >= 0 && d4 <= d3 ) {

				// vertex region of B; barycentric coords (0, 1, 0)
				return target.copy( b );

			}

			var 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 );
			var d5 = _vab.dot( _vcp );
			var d6 = _vac.dot( _vcp );
			if ( d6 >= 0 && d5 <= d6 ) {

				// vertex region of C; barycentric coords (0, 0, 1)
				return target.copy( c );

			}

			var 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 );

			}

			var 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
			var 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: function ( triangle ) {

			return triangle.a.equals( this.a ) && triangle.b.equals( this.b ) && triangle.c.equals( this.c );

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	var _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 };

	var _hslA = { h: 0, s: 0, l: 0 };
	var _hslB = { h: 0, s: 0, l: 0 };

	function Color( r, g, b ) {

		if ( g === undefined && b === undefined ) {

			// r is THREE.Color, hex or string
			return this.set( r );

		}

		return this.setRGB( r, g, b );

	}

	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;

	}

	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;

	}

	Object.assign( Color.prototype, {

		isColor: true,

		r: 1, g: 1, b: 1,

		set: function ( value ) {

			if ( value && value.isColor ) {

				this.copy( value );

			} else if ( typeof value === 'number' ) {

				this.setHex( value );

			} else if ( typeof value === 'string' ) {

				this.setStyle( value );

			}

			return this;

		},

		setScalar: function ( scalar ) {

			this.r = scalar;
			this.g = scalar;
			this.b = scalar;

			return this;

		},

		setHex: function ( hex ) {

			hex = Math.floor( hex );

			this.r = ( hex >> 16 & 255 ) / 255;
			this.g = ( hex >> 8 & 255 ) / 255;
			this.b = ( hex & 255 ) / 255;

			return this;

		},

		setRGB: function ( r, g, b ) {

			this.r = r;
			this.g = g;
			this.b = b;

			return this;

		},

		setHSL: function ( h, s, l ) {

			// h,s,l ranges are in 0.0 - 1.0
			h = MathUtils.euclideanModulo( h, 1 );
			s = MathUtils.clamp( s, 0, 1 );
			l = MathUtils.clamp( l, 0, 1 );

			if ( s === 0 ) {

				this.r = this.g = this.b = l;

			} else {

				var p = l <= 0.5 ? l * ( 1 + s ) : l + s - ( l * s );
				var 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 );

			}

			return this;

		},

		setStyle: function ( style ) {

			function handleAlpha( string ) {

				if ( string === undefined ) { return; }

				if ( parseFloat( string ) < 1 ) {

					console.warn( 'THREE.Color: Alpha component of ' + style + ' will be ignored.' );

				}

			}


			var m;

			if ( m = /^((?:rgb|hsl)a?)\(\s*([^\)]*)\)/.exec( style ) ) {

				// rgb / hsl

				var color;
				var name = m[ 1 ];
				var components = m[ 2 ];

				switch ( name ) {

					case 'rgb':
					case 'rgba':

						if ( color = /^(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*(,\s*([0-9]*\.?[0-9]+)\s*)?$/.exec( components ) ) {

							// rgb(255,0,0) rgba(255,0,0,0.5)
							this.r = Math.min( 255, parseInt( color[ 1 ], 10 ) ) / 255;
							this.g = Math.min( 255, parseInt( color[ 2 ], 10 ) ) / 255;
							this.b = Math.min( 255, parseInt( color[ 3 ], 10 ) ) / 255;

							handleAlpha( color[ 5 ] );

							return this;

						}

						if ( color = /^(\d+)\%\s*,\s*(\d+)\%\s*,\s*(\d+)\%\s*(,\s*([0-9]*\.?[0-9]+)\s*)?$/.exec( components ) ) {

							// rgb(100%,0%,0%) rgba(100%,0%,0%,0.5)
							this.r = Math.min( 100, parseInt( color[ 1 ], 10 ) ) / 100;
							this.g = Math.min( 100, parseInt( color[ 2 ], 10 ) ) / 100;
							this.b = Math.min( 100, parseInt( color[ 3 ], 10 ) ) / 100;

							handleAlpha( color[ 5 ] );

							return this;

						}

						break;

					case 'hsl':
					case 'hsla':

						if ( color = /^([0-9]*\.?[0-9]+)\s*,\s*(\d+)\%\s*,\s*(\d+)\%\s*(,\s*([0-9]*\.?[0-9]+)\s*)?$/.exec( components ) ) {

							// hsl(120,50%,50%) hsla(120,50%,50%,0.5)
							var h = parseFloat( color[ 1 ] ) / 360;
							var s = parseInt( color[ 2 ], 10 ) / 100;
							var l = parseInt( color[ 3 ], 10 ) / 100;

							handleAlpha( color[ 5 ] );

							return this.setHSL( h, s, l );

						}

						break;

				}

			} else if ( m = /^\#([A-Fa-f0-9]+)$/.exec( style ) ) {

				// hex color

				var hex = m[ 1 ];
				var size = hex.length;

				if ( size === 3 ) {

					// #ff0
					this.r = parseInt( hex.charAt( 0 ) + hex.charAt( 0 ), 16 ) / 255;
					this.g = parseInt( hex.charAt( 1 ) + hex.charAt( 1 ), 16 ) / 255;
					this.b = parseInt( hex.charAt( 2 ) + hex.charAt( 2 ), 16 ) / 255;

					return this;

				} else if ( size === 6 ) {

					// #ff0000
					this.r = parseInt( hex.charAt( 0 ) + hex.charAt( 1 ), 16 ) / 255;
					this.g = parseInt( hex.charAt( 2 ) + hex.charAt( 3 ), 16 ) / 255;
					this.b = parseInt( hex.charAt( 4 ) + hex.charAt( 5 ), 16 ) / 255;

					return this;

				}

			}

			if ( style && style.length > 0 ) {

				return this.setColorName( style );

			}

			return this;

		},

		setColorName: function ( style ) {

			// color keywords
			var hex = _colorKeywords[ style ];

			if ( hex !== undefined ) {

				// red
				this.setHex( hex );

			} else {

				// unknown color
				console.warn( 'THREE.Color: Unknown color ' + style );

			}

			return this;

		},

		clone: function () {

			return new this.constructor( this.r, this.g, this.b );

		},

		copy: function ( color ) {

			this.r = color.r;
			this.g = color.g;
			this.b = color.b;

			return this;

		},

		copyGammaToLinear: function ( color, gammaFactor ) {

			if ( gammaFactor === undefined ) { gammaFactor = 2.0; }

			this.r = Math.pow( color.r, gammaFactor );
			this.g = Math.pow( color.g, gammaFactor );
			this.b = Math.pow( color.b, gammaFactor );

			return this;

		},

		copyLinearToGamma: function ( color, gammaFactor ) {

			if ( gammaFactor === undefined ) { gammaFactor = 2.0; }

			var safeInverse = ( gammaFactor > 0 ) ? ( 1.0 / gammaFactor ) : 1.0;

			this.r = Math.pow( color.r, safeInverse );
			this.g = Math.pow( color.g, safeInverse );
			this.b = Math.pow( color.b, safeInverse );

			return this;

		},

		convertGammaToLinear: function ( gammaFactor ) {

			this.copyGammaToLinear( this, gammaFactor );

			return this;

		},

		convertLinearToGamma: function ( gammaFactor ) {

			this.copyLinearToGamma( this, gammaFactor );

			return this;

		},

		copySRGBToLinear: function ( color ) {

			this.r = SRGBToLinear( color.r );
			this.g = SRGBToLinear( color.g );
			this.b = SRGBToLinear( color.b );

			return this;

		},

		copyLinearToSRGB: function ( color ) {

			this.r = LinearToSRGB( color.r );
			this.g = LinearToSRGB( color.g );
			this.b = LinearToSRGB( color.b );

			return this;

		},

		convertSRGBToLinear: function () {

			this.copySRGBToLinear( this );

			return this;

		},

		convertLinearToSRGB: function () {

			this.copyLinearToSRGB( this );

			return this;

		},

		getHex: function () {

			return ( this.r * 255 ) << 16 ^ ( this.g * 255 ) << 8 ^ ( this.b * 255 ) << 0;

		},

		getHexString: function () {

			return ( '000000' + this.getHex().toString( 16 ) ).slice( - 6 );

		},

		getHSL: function ( target ) {

			// h,s,l ranges are in 0.0 - 1.0

			if ( target === undefined ) {

				console.warn( 'THREE.Color: .getHSL() target is now required' );
				target = { h: 0, s: 0, l: 0 };

			}

			var r = this.r, g = this.g, b = this.b;

			var max = Math.max( r, g, b );
			var min = Math.min( r, g, b );

			var hue, saturation;
			var lightness = ( min + max ) / 2.0;

			if ( min === max ) {

				hue = 0;
				saturation = 0;

			} else {

				var 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;

		},

		getStyle: function () {

			return 'rgb(' + ( ( this.r * 255 ) | 0 ) + ',' + ( ( this.g * 255 ) | 0 ) + ',' + ( ( this.b * 255 ) | 0 ) + ')';

		},

		offsetHSL: function ( h, s, l ) {

			this.getHSL( _hslA );

			_hslA.h += h; _hslA.s += s; _hslA.l += l;

			this.setHSL( _hslA.h, _hslA.s, _hslA.l );

			return this;

		},

		add: function ( color ) {

			this.r += color.r;
			this.g += color.g;
			this.b += color.b;

			return this;

		},

		addColors: function ( color1, color2 ) {

			this.r = color1.r + color2.r;
			this.g = color1.g + color2.g;
			this.b = color1.b + color2.b;

			return this;

		},

		addScalar: function ( s ) {

			this.r += s;
			this.g += s;
			this.b += s;

			return this;

		},

		sub: function ( 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: function ( color ) {

			this.r *= color.r;
			this.g *= color.g;
			this.b *= color.b;

			return this;

		},

		multiplyScalar: function ( s ) {

			this.r *= s;
			this.g *= s;
			this.b *= s;

			return this;

		},

		lerp: function ( 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;

		},

		lerpHSL: function ( color, alpha ) {

			this.getHSL( _hslA );
			color.getHSL( _hslB );

			var h = MathUtils.lerp( _hslA.h, _hslB.h, alpha );
			var s = MathUtils.lerp( _hslA.s, _hslB.s, alpha );
			var l = MathUtils.lerp( _hslA.l, _hslB.l, alpha );

			this.setHSL( h, s, l );

			return this;

		},

		equals: function ( c ) {

			return ( c.r === this.r ) && ( c.g === this.g ) && ( c.b === this.b );

		},

		fromArray: function ( array, offset ) {

			if ( offset === undefined ) { offset = 0; }

			this.r = array[ offset ];
			this.g = array[ offset + 1 ];
			this.b = array[ offset + 2 ];

			return this;

		},

		toArray: function ( array, offset ) {

			if ( array === undefined ) { array = []; }
			if ( offset === undefined ) { offset = 0; }

			array[ offset ] = this.r;
			array[ offset + 1 ] = this.g;
			array[ offset + 2 ] = this.b;

			return array;

		},

		toJSON: function () {

			return this.getHex();

		}

	} );

	Color.NAMES = _colorKeywords;

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author alteredq / http://alteredqualia.com/
	 */

	function Face3( a, b, c, normal, color, materialIndex ) {

		this.a = a;
		this.b = b;
		this.c = c;

		this.normal = ( normal && normal.isVector3 ) ? normal : new Vector3();
		this.vertexNormals = Array.isArray( normal ) ? normal : [];

		this.color = ( color && color.isColor ) ? color : new Color();
		this.vertexColors = Array.isArray( color ) ? color : [];

		this.materialIndex = materialIndex !== undefined ? materialIndex : 0;

	}

	Object.assign( Face3.prototype, {

		clone: function () {

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

		},

		copy: function ( source ) {

			this.a = source.a;
			this.b = source.b;
			this.c = source.c;

			this.normal.copy( source.normal );
			this.color.copy( source.color );

			this.materialIndex = source.materialIndex;

			for ( var i = 0, il = source.vertexNormals.length; i < il; i ++ ) {

				this.vertexNormals[ i ] = source.vertexNormals[ i ].clone();

			}

			for ( var i = 0, il = source.vertexColors.length; i < il; i ++ ) {

				this.vertexColors[ i ] = source.vertexColors[ i ].clone();

			}

			return this;

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author alteredq / http://alteredqualia.com/
	 */

	var materialId = 0;

	function Material() {

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

		this.uuid = MathUtils.generateUUID();

		this.name = '';
		this.type = 'Material';

		this.fog = true;

		this.blending = NormalBlending;
		this.side = FrontSide;
		this.flatShading = false;
		this.vertexColors = false;

		this.opacity = 1;
		this.transparent = false;

		this.blendSrc = SrcAlphaFactor;
		this.blendDst = OneMinusSrcAlphaFactor;
		this.blendEquation = AddEquation;
		this.blendSrcAlpha = null;
		this.blendDstAlpha = null;
		this.blendEquationAlpha = null;

		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.alphaTest = 0;
		this.premultipliedAlpha = false;

		this.visible = true;

		this.toneMapped = true;

		this.userData = {};

		this.version = 0;

	}

	Material.prototype = Object.assign( Object.create( EventDispatcher.prototype ), {

		constructor: Material,

		isMaterial: true,

		onBeforeCompile: function () {},

		setValues: function ( values ) {

			if ( values === undefined ) { return; }

			for ( var key in values ) {

				var newValue = values[ key ];

				if ( newValue === undefined ) {

					console.warn( "THREE.Material: '" + key + "' parameter is undefined." );
					continue;

				}

				// for backward compatability if shading is set in the constructor
				if ( key === 'shading' ) {

					console.warn( 'THREE.' + this.type + ': .shading has been removed. Use the boolean .flatShading instead.' );
					this.flatShading = ( newValue === FlatShading ) ? true : false;
					continue;

				}

				var currentValue = this[ key ];

				if ( currentValue === undefined ) {

					console.warn( "THREE." + this.type + ": '" + key + "' is not a property of this material." );
					continue;

				}

				if ( currentValue && currentValue.isColor ) {

					currentValue.set( newValue );

				} else if ( ( currentValue && currentValue.isVector3 ) && ( newValue && newValue.isVector3 ) ) {

					currentValue.copy( newValue );

				} else {

					this[ key ] = newValue;

				}

			}

		},

		toJSON: function ( meta ) {

			var isRoot = ( meta === undefined || typeof meta === 'string' );

			if ( isRoot ) {

				meta = {
					textures: {},
					images: {}
				};

			}

			var data = {
				metadata: {
					version: 4.5,
					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 && this.sheen.isColor ) { data.sheen = this.sheen.getHex(); }
			if ( this.emissive && this.emissive.isColor ) { data.emissive = this.emissive.getHex(); }
			if ( this.emissiveIntensity && this.emissiveIntensity !== 1 ) { data.emissiveIntensity = this.emissiveIntensity; }

			if ( this.specular && this.specular.isColor ) { data.specular = this.specular.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.clearcoatNormalMap && this.clearcoatNormalMap.isTexture ) {

				data.clearcoatNormalMap = this.clearcoatNormalMap.toJSON( meta ).uuid;
				data.clearcoatNormalScale = this.clearcoatNormalScale.toArray();

			}

			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; }

			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.envMap && this.envMap.isTexture ) {

				data.envMap = this.envMap.toJSON( meta ).uuid;
				data.reflectivity = this.reflectivity; // Scale behind envMap
				data.refractionRatio = this.refractionRatio;

				if ( this.combine !== undefined ) { data.combine = this.combine; }
				if ( this.envMapIntensity !== undefined ) { data.envMapIntensity = this.envMapIntensity; }

			}

			if ( this.gradientMap && this.gradientMap.isTexture ) {

				data.gradientMap = this.gradientMap.toJSON( meta ).uuid;

			}

			if ( this.size !== undefined ) { data.size = this.size; }
			if ( this.sizeAttenuation !== undefined ) { data.sizeAttenuation = this.sizeAttenuation; }

			if ( this.blending !== NormalBlending ) { data.blending = this.blending; }
			if ( this.flatShading === true ) { data.flatShading = this.flatShading; }
			if ( this.side !== FrontSide ) { data.side = this.side; }
			if ( this.vertexColors ) { data.vertexColors = true; }

			if ( this.opacity < 1 ) { data.opacity = this.opacity; }
			if ( this.transparent === true ) { data.transparent = this.transparent; }

			data.depthFunc = this.depthFunc;
			data.depthTest = this.depthTest;
			data.depthWrite = this.depthWrite;

			data.stencilWrite = this.stencilWrite;
			data.stencilWriteMask = this.stencilWriteMask;
			data.stencilFunc = this.stencilFunc;
			data.stencilRef = this.stencilRef;
			data.stencilFuncMask = this.stencilFuncMask;
			data.stencilFail = this.stencilFail;
			data.stencilZFail = this.stencilZFail;
			data.stencilZPass = this.stencilZPass;

			// rotation (SpriteMaterial)
			if ( this.rotation && 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 && 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.premultipliedAlpha === true ) { data.premultipliedAlpha = this.premultipliedAlpha; }

			if ( this.wireframe === true ) { data.wireframe = this.wireframe; }
			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.morphTargets === true ) { data.morphTargets = true; }
			if ( this.morphNormals === true ) { data.morphNormals = true; }
			if ( this.skinning === true ) { data.skinning = true; }

			if ( this.visible === false ) { data.visible = false; }

			if ( this.toneMapped === false ) { data.toneMapped = false; }

			if ( JSON.stringify( this.userData ) !== '{}' ) { data.userData = this.userData; }

			// TODO: Copied from Object3D.toJSON

			function extractFromCache( cache ) {

				var values = [];

				for ( var key in cache ) {

					var data = cache[ key ];
					delete data.metadata;
					values.push( data );

				}

				return values;

			}

			if ( isRoot ) {

				var textures = extractFromCache( meta.textures );
				var images = extractFromCache( meta.images );

				if ( textures.length > 0 ) { data.textures = textures; }
				if ( images.length > 0 ) { data.images = images; }

			}

			return data;

		},

		clone: function () {

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

		},

		copy: function ( source ) {

			this.name = source.name;

			this.fog = source.fog;

			this.blending = source.blending;
			this.side = source.side;
			this.flatShading = source.flatShading;
			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.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;

			var srcPlanes = source.clippingPlanes,
				dstPlanes = null;

			if ( srcPlanes !== null ) {

				var n = srcPlanes.length;
				dstPlanes = new Array( n );

				for ( var 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.premultipliedAlpha = source.premultipliedAlpha;

			this.visible = source.visible;

			this.toneMapped = source.toneMapped;

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

			return this;

		},

		dispose: function () {

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

		}

	} );

	Object.defineProperty( Material.prototype, 'needsUpdate', {

		set: function ( value ) {

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

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author alteredq / http://alteredqualia.com/
	 *
	 * parameters = {
	 *  color: <hex>,
	 *  opacity: <float>,
	 *  map: new THREE.Texture( <Image> ),
	 *
	 *  lightMap: new THREE.Texture( <Image> ),
	 *  lightMapIntensity: <float>
	 *
	 *  aoMap: new THREE.Texture( <Image> ),
	 *  aoMapIntensity: <float>
	 *
	 *  specularMap: new THREE.Texture( <Image> ),
	 *
	 *  alphaMap: new THREE.Texture( <Image> ),
	 *
	 *  envMap: new THREE.CubeTexture( [posx, negx, posy, negy, posz, negz] ),
	 *  combine: THREE.Multiply,
	 *  reflectivity: <float>,
	 *  refractionRatio: <float>,
	 *
	 *  depthTest: <bool>,
	 *  depthWrite: <bool>,
	 *
	 *  wireframe: <boolean>,
	 *  wireframeLinewidth: <float>,
	 *
	 *  skinning: <bool>,
	 *  morphTargets: <bool>
	 * }
	 */

	function MeshBasicMaterial( parameters ) {

		Material.call( this );

		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.combine = MultiplyOperation;
		this.reflectivity = 1;
		this.refractionRatio = 0.98;

		this.wireframe = false;
		this.wireframeLinewidth = 1;
		this.wireframeLinecap = 'round';
		this.wireframeLinejoin = 'round';

		this.skinning = false;
		this.morphTargets = false;

		this.setValues( parameters );

	}

	MeshBasicMaterial.prototype = Object.create( Material.prototype );
	MeshBasicMaterial.prototype.constructor = MeshBasicMaterial;

	MeshBasicMaterial.prototype.isMeshBasicMaterial = true;

	MeshBasicMaterial.prototype.copy = function ( source ) {

		Material.prototype.copy.call( this, 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.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.skinning = source.skinning;
		this.morphTargets = source.morphTargets;

		return this;

	};

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	var _vector$3 = new Vector3();

	function BufferAttribute( array, itemSize, normalized ) {

		if ( Array.isArray( array ) ) {

			throw new TypeError( 'THREE.BufferAttribute: array should be a Typed Array.' );

		}

		this.name = '';

		this.array = array;
		this.itemSize = itemSize;
		this.count = array !== undefined ? array.length / itemSize : 0;
		this.normalized = normalized === true;

		this.usage = StaticDrawUsage;
		this.updateRange = { offset: 0, count: - 1 };

		this.version = 0;

	}

	Object.defineProperty( BufferAttribute.prototype, 'needsUpdate', {

		set: function ( value ) {

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

		}

	} );

	Object.assign( BufferAttribute.prototype, {

		isBufferAttribute: true,

		onUploadCallback: function () {},

		setUsage: function ( value ) {

			this.usage = value;

			return this;

		},

		copy: function ( 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;

			return this;

		},

		copyAt: function ( index1, attribute, index2 ) {

			index1 *= this.itemSize;
			index2 *= attribute.itemSize;

			for ( var i = 0, l = this.itemSize; i < l; i ++ ) {

				this.array[ index1 + i ] = attribute.array[ index2 + i ];

			}

			return this;

		},

		copyArray: function ( array ) {

			this.array.set( array );

			return this;

		},

		copyColorsArray: function ( colors ) {

			var array = this.array, offset = 0;

			for ( var i = 0, l = colors.length; i < l; i ++ ) {

				var color = colors[ i ];

				if ( color === undefined ) {

					console.warn( 'THREE.BufferAttribute.copyColorsArray(): color is undefined', i );
					color = new Color();

				}

				array[ offset ++ ] = color.r;
				array[ offset ++ ] = color.g;
				array[ offset ++ ] = color.b;

			}

			return this;

		},

		copyVector2sArray: function ( vectors ) {

			var array = this.array, offset = 0;

			for ( var i = 0, l = vectors.length; i < l; i ++ ) {

				var vector = vectors[ i ];

				if ( vector === undefined ) {

					console.warn( 'THREE.BufferAttribute.copyVector2sArray(): vector is undefined', i );
					vector = new Vector2();

				}

				array[ offset ++ ] = vector.x;
				array[ offset ++ ] = vector.y;

			}

			return this;

		},

		copyVector3sArray: function ( vectors ) {

			var array = this.array, offset = 0;

			for ( var i = 0, l = vectors.length; i < l; i ++ ) {

				var vector = vectors[ i ];

				if ( vector === undefined ) {

					console.warn( 'THREE.BufferAttribute.copyVector3sArray(): vector is undefined', i );
					vector = new Vector3();

				}

				array[ offset ++ ] = vector.x;
				array[ offset ++ ] = vector.y;
				array[ offset ++ ] = vector.z;

			}

			return this;

		},

		copyVector4sArray: function ( vectors ) {

			var array = this.array, offset = 0;

			for ( var i = 0, l = vectors.length; i < l; i ++ ) {

				var vector = vectors[ i ];

				if ( vector === undefined ) {

					console.warn( 'THREE.BufferAttribute.copyVector4sArray(): vector is undefined', i );
					vector = new Vector4();

				}

				array[ offset ++ ] = vector.x;
				array[ offset ++ ] = vector.y;
				array[ offset ++ ] = vector.z;
				array[ offset ++ ] = vector.w;

			}

			return this;

		},

		applyMatrix3: function ( m ) {

			for ( var i = 0, l = this.count; i < l; i ++ ) {

				_vector$3.x = this.getX( i );
				_vector$3.y = this.getY( i );
				_vector$3.z = this.getZ( i );

				_vector$3.applyMatrix3( m );

				this.setXYZ( i, _vector$3.x, _vector$3.y, _vector$3.z );

			}

			return this;

		},

		applyMatrix4: function ( m ) {

			for ( var i = 0, l = this.count; i < l; i ++ ) {

				_vector$3.x = this.getX( i );
				_vector$3.y = this.getY( i );
				_vector$3.z = this.getZ( i );

				_vector$3.applyMatrix4( m );

				this.setXYZ( i, _vector$3.x, _vector$3.y, _vector$3.z );

			}

			return this;

		},

		applyNormalMatrix: function ( m ) {

			for ( var i = 0, l = this.count; i < l; i ++ ) {

				_vector$3.x = this.getX( i );
				_vector$3.y = this.getY( i );
				_vector$3.z = this.getZ( i );

				_vector$3.applyNormalMatrix( m );

				this.setXYZ( i, _vector$3.x, _vector$3.y, _vector$3.z );

			}

			return this;

		},

		transformDirection: function ( m ) {

			for ( var i = 0, l = this.count; i < l; i ++ ) {

				_vector$3.x = this.getX( i );
				_vector$3.y = this.getY( i );
				_vector$3.z = this.getZ( i );

				_vector$3.transformDirection( m );

				this.setXYZ( i, _vector$3.x, _vector$3.y, _vector$3.z );

			}

			return this;

		},

		set: function ( value, offset ) {

			if ( offset === undefined ) { offset = 0; }

			this.array.set( value, offset );

			return this;

		},

		getX: function ( index ) {

			return this.array[ index * this.itemSize ];

		},

		setX: function ( index, x ) {

			this.array[ index * this.itemSize ] = x;

			return this;

		},

		getY: function ( index ) {

			return this.array[ index * this.itemSize + 1 ];

		},

		setY: function ( index, y ) {

			this.array[ index * this.itemSize + 1 ] = y;

			return this;

		},

		getZ: function ( index ) {

			return this.array[ index * this.itemSize + 2 ];

		},

		setZ: function ( index, z ) {

			this.array[ index * this.itemSize + 2 ] = z;

			return this;

		},

		getW: function ( index ) {

			return this.array[ index * this.itemSize + 3 ];

		},

		setW: function ( index, w ) {

			this.array[ index * this.itemSize + 3 ] = w;

			return this;

		},

		setXY: function ( index, x, y ) {

			index *= this.itemSize;

			this.array[ index + 0 ] = x;
			this.array[ index + 1 ] = y;

			return this;

		},

		setXYZ: function ( index, x, y, z ) {

			index *= this.itemSize;

			this.array[ index + 0 ] = x;
			this.array[ index + 1 ] = y;
			this.array[ index + 2 ] = z;

			return this;

		},

		setXYZW: function ( index, x, y, z, w ) {

			index *= this.itemSize;

			this.array[ index + 0 ] = x;
			this.array[ index + 1 ] = y;
			this.array[ index + 2 ] = z;
			this.array[ index + 3 ] = w;

			return this;

		},

		onUpload: function ( callback ) {

			this.onUploadCallback = callback;

			return this;

		},

		clone: function () {

			return new this.constructor( this.array, this.itemSize ).copy( this );

		},

		toJSON: function () {

			return {
				itemSize: this.itemSize,
				type: this.array.constructor.name,
				array: Array.prototype.slice.call( this.array ),
				normalized: this.normalized
			};

		}

	} );

	//

	function Int8BufferAttribute( array, itemSize, normalized ) {

		BufferAttribute.call( this, new Int8Array( array ), itemSize, normalized );

	}

	Int8BufferAttribute.prototype = Object.create( BufferAttribute.prototype );
	Int8BufferAttribute.prototype.constructor = Int8BufferAttribute;


	function Uint8BufferAttribute( array, itemSize, normalized ) {

		BufferAttribute.call( this, new Uint8Array( array ), itemSize, normalized );

	}

	Uint8BufferAttribute.prototype = Object.create( BufferAttribute.prototype );
	Uint8BufferAttribute.prototype.constructor = Uint8BufferAttribute;


	function Uint8ClampedBufferAttribute( array, itemSize, normalized ) {

		BufferAttribute.call( this, new Uint8ClampedArray( array ), itemSize, normalized );

	}

	Uint8ClampedBufferAttribute.prototype = Object.create( BufferAttribute.prototype );
	Uint8ClampedBufferAttribute.prototype.constructor = Uint8ClampedBufferAttribute;


	function Int16BufferAttribute( array, itemSize, normalized ) {

		BufferAttribute.call( this, new Int16Array( array ), itemSize, normalized );

	}

	Int16BufferAttribute.prototype = Object.create( BufferAttribute.prototype );
	Int16BufferAttribute.prototype.constructor = Int16BufferAttribute;


	function Uint16BufferAttribute( array, itemSize, normalized ) {

		BufferAttribute.call( this, new Uint16Array( array ), itemSize, normalized );

	}

	Uint16BufferAttribute.prototype = Object.create( BufferAttribute.prototype );
	Uint16BufferAttribute.prototype.constructor = Uint16BufferAttribute;


	function Int32BufferAttribute( array, itemSize, normalized ) {

		BufferAttribute.call( this, new Int32Array( array ), itemSize, normalized );

	}

	Int32BufferAttribute.prototype = Object.create( BufferAttribute.prototype );
	Int32BufferAttribute.prototype.constructor = Int32BufferAttribute;


	function Uint32BufferAttribute( array, itemSize, normalized ) {

		BufferAttribute.call( this, new Uint32Array( array ), itemSize, normalized );

	}

	Uint32BufferAttribute.prototype = Object.create( BufferAttribute.prototype );
	Uint32BufferAttribute.prototype.constructor = Uint32BufferAttribute;


	function Float32BufferAttribute( array, itemSize, normalized ) {

		BufferAttribute.call( this, new Float32Array( array ), itemSize, normalized );

	}

	Float32BufferAttribute.prototype = Object.create( BufferAttribute.prototype );
	Float32BufferAttribute.prototype.constructor = Float32BufferAttribute;


	function Float64BufferAttribute( array, itemSize, normalized ) {

		BufferAttribute.call( this, new Float64Array( array ), itemSize, normalized );

	}

	Float64BufferAttribute.prototype = Object.create( BufferAttribute.prototype );
	Float64BufferAttribute.prototype.constructor = Float64BufferAttribute;

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function DirectGeometry() {

		this.vertices = [];
		this.normals = [];
		this.colors = [];
		this.uvs = [];
		this.uvs2 = [];

		this.groups = [];

		this.morphTargets = {};

		this.skinWeights = [];
		this.skinIndices = [];

		// this.lineDistances = [];

		this.boundingBox = null;
		this.boundingSphere = null;

		// update flags

		this.verticesNeedUpdate = false;
		this.normalsNeedUpdate = false;
		this.colorsNeedUpdate = false;
		this.uvsNeedUpdate = false;
		this.groupsNeedUpdate = false;

	}

	Object.assign( DirectGeometry.prototype, {

		computeGroups: function ( geometry ) {

			var group;
			var groups = [];
			var materialIndex = undefined;

			var faces = geometry.faces;

			for ( var i = 0; i < faces.length; i ++ ) {

				var face = faces[ i ];

				// materials

				if ( face.materialIndex !== materialIndex ) {

					materialIndex = face.materialIndex;

					if ( group !== undefined ) {

						group.count = ( i * 3 ) - group.start;
						groups.push( group );

					}

					group = {
						start: i * 3,
						materialIndex: materialIndex
					};

				}

			}

			if ( group !== undefined ) {

				group.count = ( i * 3 ) - group.start;
				groups.push( group );

			}

			this.groups = groups;

		},

		fromGeometry: function ( geometry ) {

			var faces = geometry.faces;
			var vertices = geometry.vertices;
			var faceVertexUvs = geometry.faceVertexUvs;

			var hasFaceVertexUv = faceVertexUvs[ 0 ] && faceVertexUvs[ 0 ].length > 0;
			var hasFaceVertexUv2 = faceVertexUvs[ 1 ] && faceVertexUvs[ 1 ].length > 0;

			// morphs

			var morphTargets = geometry.morphTargets;
			var morphTargetsLength = morphTargets.length;

			var morphTargetsPosition;

			if ( morphTargetsLength > 0 ) {

				morphTargetsPosition = [];

				for ( var i = 0; i < morphTargetsLength; i ++ ) {

					morphTargetsPosition[ i ] = {
						name: morphTargets[ i ].name,
					 	data: []
					};

				}

				this.morphTargets.position = morphTargetsPosition;

			}

			var morphNormals = geometry.morphNormals;
			var morphNormalsLength = morphNormals.length;

			var morphTargetsNormal;

			if ( morphNormalsLength > 0 ) {

				morphTargetsNormal = [];

				for ( var i = 0; i < morphNormalsLength; i ++ ) {

					morphTargetsNormal[ i ] = {
						name: morphNormals[ i ].name,
					 	data: []
					};

				}

				this.morphTargets.normal = morphTargetsNormal;

			}

			// skins

			var skinIndices = geometry.skinIndices;
			var skinWeights = geometry.skinWeights;

			var hasSkinIndices = skinIndices.length === vertices.length;
			var hasSkinWeights = skinWeights.length === vertices.length;

			//

			if ( vertices.length > 0 && faces.length === 0 ) {

				console.error( 'THREE.DirectGeometry: Faceless geometries are not supported.' );

			}

			for ( var i = 0; i < faces.length; i ++ ) {

				var face = faces[ i ];

				this.vertices.push( vertices[ face.a ], vertices[ face.b ], vertices[ face.c ] );

				var vertexNormals = face.vertexNormals;

				if ( vertexNormals.length === 3 ) {

					this.normals.push( vertexNormals[ 0 ], vertexNormals[ 1 ], vertexNormals[ 2 ] );

				} else {

					var normal = face.normal;

					this.normals.push( normal, normal, normal );

				}

				var vertexColors = face.vertexColors;

				if ( vertexColors.length === 3 ) {

					this.colors.push( vertexColors[ 0 ], vertexColors[ 1 ], vertexColors[ 2 ] );

				} else {

					var color = face.color;

					this.colors.push( color, color, color );

				}

				if ( hasFaceVertexUv === true ) {

					var vertexUvs = faceVertexUvs[ 0 ][ i ];

					if ( vertexUvs !== undefined ) {

						this.uvs.push( vertexUvs[ 0 ], vertexUvs[ 1 ], vertexUvs[ 2 ] );

					} else {

						console.warn( 'THREE.DirectGeometry.fromGeometry(): Undefined vertexUv ', i );

						this.uvs.push( new Vector2(), new Vector2(), new Vector2() );

					}

				}

				if ( hasFaceVertexUv2 === true ) {

					var vertexUvs = faceVertexUvs[ 1 ][ i ];

					if ( vertexUvs !== undefined ) {

						this.uvs2.push( vertexUvs[ 0 ], vertexUvs[ 1 ], vertexUvs[ 2 ] );

					} else {

						console.warn( 'THREE.DirectGeometry.fromGeometry(): Undefined vertexUv2 ', i );

						this.uvs2.push( new Vector2(), new Vector2(), new Vector2() );

					}

				}

				// morphs

				for ( var j = 0; j < morphTargetsLength; j ++ ) {

					var morphTarget = morphTargets[ j ].vertices;

					morphTargetsPosition[ j ].data.push( morphTarget[ face.a ], morphTarget[ face.b ], morphTarget[ face.c ] );

				}

				for ( var j = 0; j < morphNormalsLength; j ++ ) {

					var morphNormal = morphNormals[ j ].vertexNormals[ i ];

					morphTargetsNormal[ j ].data.push( morphNormal.a, morphNormal.b, morphNormal.c );

				}

				// skins

				if ( hasSkinIndices ) {

					this.skinIndices.push( skinIndices[ face.a ], skinIndices[ face.b ], skinIndices[ face.c ] );

				}

				if ( hasSkinWeights ) {

					this.skinWeights.push( skinWeights[ face.a ], skinWeights[ face.b ], skinWeights[ face.c ] );

				}

			}

			this.computeGroups( geometry );

			this.verticesNeedUpdate = geometry.verticesNeedUpdate;
			this.normalsNeedUpdate = geometry.normalsNeedUpdate;
			this.colorsNeedUpdate = geometry.colorsNeedUpdate;
			this.uvsNeedUpdate = geometry.uvsNeedUpdate;
			this.groupsNeedUpdate = geometry.groupsNeedUpdate;

			if ( geometry.boundingSphere !== null ) {

				this.boundingSphere = geometry.boundingSphere.clone();

			}

			if ( geometry.boundingBox !== null ) {

				this.boundingBox = geometry.boundingBox.clone();

			}

			return this;

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function arrayMax( array ) {

		if ( array.length === 0 ) { return - Infinity; }

		var max = array[ 0 ];

		for ( var i = 1, l = array.length; i < l; ++ i ) {

			if ( array[ i ] > max ) { max = array[ i ]; }

		}

		return max;

	}

	/**
	 * @author alteredq / http://alteredqualia.com/
	 * @author mrdoob / http://mrdoob.com/
	 */

	var _bufferGeometryId = 1; // BufferGeometry uses odd numbers as Id

	var _m1$2 = new Matrix4();
	var _obj = new Object3D();
	var _offset = new Vector3();
	var _box$2 = new Box3();
	var _boxMorphTargets = new Box3();
	var _vector$4 = new Vector3();

	function BufferGeometry() {

		Object.defineProperty( this, 'id', { value: _bufferGeometryId += 2 } );

		this.uuid = MathUtils.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 = {};

	}

	BufferGeometry.prototype = Object.assign( Object.create( EventDispatcher.prototype ), {

		constructor: BufferGeometry,

		isBufferGeometry: true,

		getIndex: function () {

			return this.index;

		},

		setIndex: function ( index ) {

			if ( Array.isArray( index ) ) {

				this.index = new ( arrayMax( index ) > 65535 ? Uint32BufferAttribute : Uint16BufferAttribute )( index, 1 );

			} else {

				this.index = index;

			}

		},

		getAttribute: function ( name ) {

			return this.attributes[ name ];

		},

		setAttribute: function ( name, attribute ) {

			this.attributes[ name ] = attribute;

			return this;

		},

		deleteAttribute: function ( name ) {

			delete this.attributes[ name ];

			return this;

		},

		addGroup: function ( start, count, materialIndex ) {

			this.groups.push( {

				start: start,
				count: count,
				materialIndex: materialIndex !== undefined ? materialIndex : 0

			} );

		},

		clearGroups: function () {

			this.groups = [];

		},

		setDrawRange: function ( start, count ) {

			this.drawRange.start = start;
			this.drawRange.count = count;

		},

		applyMatrix4: function ( matrix ) {

			var position = this.attributes.position;

			if ( position !== undefined ) {

				position.applyMatrix4( matrix );

				position.needsUpdate = true;

			}

			var normal = this.attributes.normal;

			if ( normal !== undefined ) {

				var normalMatrix = new Matrix3().getNormalMatrix( matrix );

				normal.applyNormalMatrix( normalMatrix );

				normal.needsUpdate = true;

			}

			var 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;

		},

		rotateX: function ( angle ) {

			// rotate geometry around world x-axis

			_m1$2.makeRotationX( angle );

			this.applyMatrix4( _m1$2 );

			return this;

		},

		rotateY: function ( angle ) {

			// rotate geometry around world y-axis

			_m1$2.makeRotationY( angle );

			this.applyMatrix4( _m1$2 );

			return this;

		},

		rotateZ: function ( angle ) {

			// rotate geometry around world z-axis

			_m1$2.makeRotationZ( angle );

			this.applyMatrix4( _m1$2 );

			return this;

		},

		translate: function ( x, y, z ) {

			// translate geometry

			_m1$2.makeTranslation( x, y, z );

			this.applyMatrix4( _m1$2 );

			return this;

		},

		scale: function ( x, y, z ) {

			// scale geometry

			_m1$2.makeScale( x, y, z );

			this.applyMatrix4( _m1$2 );

			return this;

		},

		lookAt: function ( vector ) {

			_obj.lookAt( vector );

			_obj.updateMatrix();

			this.applyMatrix4( _obj.matrix );

			return this;

		},

		center: function () {

			this.computeBoundingBox();

			this.boundingBox.getCenter( _offset ).negate();

			this.translate( _offset.x, _offset.y, _offset.z );

			return this;

		},

		setFromObject: function ( object ) {

			// console.log( 'THREE.BufferGeometry.setFromObject(). Converting', object, this );

			var geometry = object.geometry;

			if ( object.isPoints || object.isLine ) {

				var positions = new Float32BufferAttribute( geometry.vertices.length * 3, 3 );
				var colors = new Float32BufferAttribute( geometry.colors.length * 3, 3 );

				this.setAttribute( 'position', positions.copyVector3sArray( geometry.vertices ) );
				this.setAttribute( 'color', colors.copyColorsArray( geometry.colors ) );

				if ( geometry.lineDistances && geometry.lineDistances.length === geometry.vertices.length ) {

					var lineDistances = new Float32BufferAttribute( geometry.lineDistances.length, 1 );

					this.setAttribute( 'lineDistance', lineDistances.copyArray( geometry.lineDistances ) );

				}

				if ( geometry.boundingSphere !== null ) {

					this.boundingSphere = geometry.boundingSphere.clone();

				}

				if ( geometry.boundingBox !== null ) {

					this.boundingBox = geometry.boundingBox.clone();

				}

			} else if ( object.isMesh ) {

				if ( geometry && geometry.isGeometry ) {

					this.fromGeometry( geometry );

				}

			}

			return this;

		},

		setFromPoints: function ( points ) {

			var position = [];

			for ( var i = 0, l = points.length; i < l; i ++ ) {

				var point = points[ i ];
				position.push( point.x, point.y, point.z || 0 );

			}

			this.setAttribute( 'position', new Float32BufferAttribute( position, 3 ) );

			return this;

		},

		updateFromObject: function ( object ) {

			var geometry = object.geometry;

			if ( object.isMesh ) {

				var direct = geometry.__directGeometry;

				if ( geometry.elementsNeedUpdate === true ) {

					direct = undefined;
					geometry.elementsNeedUpdate = false;

				}

				if ( direct === undefined ) {

					return this.fromGeometry( geometry );

				}

				direct.verticesNeedUpdate = geometry.verticesNeedUpdate;
				direct.normalsNeedUpdate = geometry.normalsNeedUpdate;
				direct.colorsNeedUpdate = geometry.colorsNeedUpdate;
				direct.uvsNeedUpdate = geometry.uvsNeedUpdate;
				direct.groupsNeedUpdate = geometry.groupsNeedUpdate;

				geometry.verticesNeedUpdate = false;
				geometry.normalsNeedUpdate = false;
				geometry.colorsNeedUpdate = false;
				geometry.uvsNeedUpdate = false;
				geometry.groupsNeedUpdate = false;

				geometry = direct;

			}

			var attribute;

			if ( geometry.verticesNeedUpdate === true ) {

				attribute = this.attributes.position;

				if ( attribute !== undefined ) {

					attribute.copyVector3sArray( geometry.vertices );
					attribute.needsUpdate = true;

				}

				geometry.verticesNeedUpdate = false;

			}

			if ( geometry.normalsNeedUpdate === true ) {

				attribute = this.attributes.normal;

				if ( attribute !== undefined ) {

					attribute.copyVector3sArray( geometry.normals );
					attribute.needsUpdate = true;

				}

				geometry.normalsNeedUpdate = false;

			}

			if ( geometry.colorsNeedUpdate === true ) {

				attribute = this.attributes.color;

				if ( attribute !== undefined ) {

					attribute.copyColorsArray( geometry.colors );
					attribute.needsUpdate = true;

				}

				geometry.colorsNeedUpdate = false;

			}

			if ( geometry.uvsNeedUpdate ) {

				attribute = this.attributes.uv;

				if ( attribute !== undefined ) {

					attribute.copyVector2sArray( geometry.uvs );
					attribute.needsUpdate = true;

				}

				geometry.uvsNeedUpdate = false;

			}

			if ( geometry.lineDistancesNeedUpdate ) {

				attribute = this.attributes.lineDistance;

				if ( attribute !== undefined ) {

					attribute.copyArray( geometry.lineDistances );
					attribute.needsUpdate = true;

				}

				geometry.lineDistancesNeedUpdate = false;

			}

			if ( geometry.groupsNeedUpdate ) {

				geometry.computeGroups( object.geometry );
				this.groups = geometry.groups;

				geometry.groupsNeedUpdate = false;

			}

			return this;

		},

		fromGeometry: function ( geometry ) {

			geometry.__directGeometry = new DirectGeometry().fromGeometry( geometry );

			return this.fromDirectGeometry( geometry.__directGeometry );

		},

		fromDirectGeometry: function ( geometry ) {

			var positions = new Float32Array( geometry.vertices.length * 3 );
			this.setAttribute( 'position', new BufferAttribute( positions, 3 ).copyVector3sArray( geometry.vertices ) );

			if ( geometry.normals.length > 0 ) {

				var normals = new Float32Array( geometry.normals.length * 3 );
				this.setAttribute( 'normal', new BufferAttribute( normals, 3 ).copyVector3sArray( geometry.normals ) );

			}

			if ( geometry.colors.length > 0 ) {

				var colors = new Float32Array( geometry.colors.length * 3 );
				this.setAttribute( 'color', new BufferAttribute( colors, 3 ).copyColorsArray( geometry.colors ) );

			}

			if ( geometry.uvs.length > 0 ) {

				var uvs = new Float32Array( geometry.uvs.length * 2 );
				this.setAttribute( 'uv', new BufferAttribute( uvs, 2 ).copyVector2sArray( geometry.uvs ) );

			}

			if ( geometry.uvs2.length > 0 ) {

				var uvs2 = new Float32Array( geometry.uvs2.length * 2 );
				this.setAttribute( 'uv2', new BufferAttribute( uvs2, 2 ).copyVector2sArray( geometry.uvs2 ) );

			}

			// groups

			this.groups = geometry.groups;

			// morphs

			for ( var name in geometry.morphTargets ) {

				var array = [];
				var morphTargets = geometry.morphTargets[ name ];

				for ( var i = 0, l = morphTargets.length; i < l; i ++ ) {

					var morphTarget = morphTargets[ i ];

					var attribute = new Float32BufferAttribute( morphTarget.data.length * 3, 3 );
					attribute.name = morphTarget.name;

					array.push( attribute.copyVector3sArray( morphTarget.data ) );

				}

				this.morphAttributes[ name ] = array;

			}

			// skinning

			if ( geometry.skinIndices.length > 0 ) {

				var skinIndices = new Float32BufferAttribute( geometry.skinIndices.length * 4, 4 );
				this.setAttribute( 'skinIndex', skinIndices.copyVector4sArray( geometry.skinIndices ) );

			}

			if ( geometry.skinWeights.length > 0 ) {

				var skinWeights = new Float32BufferAttribute( geometry.skinWeights.length * 4, 4 );
				this.setAttribute( 'skinWeight', skinWeights.copyVector4sArray( geometry.skinWeights ) );

			}

			//

			if ( geometry.boundingSphere !== null ) {

				this.boundingSphere = geometry.boundingSphere.clone();

			}

			if ( geometry.boundingBox !== null ) {

				this.boundingBox = geometry.boundingBox.clone();

			}

			return this;

		},

		computeBoundingBox: function () {

			if ( this.boundingBox === null ) {

				this.boundingBox = new Box3();

			}

			var position = this.attributes.position;
			var morphAttributesPosition = this.morphAttributes.position;

			if ( position !== undefined ) {

				this.boundingBox.setFromBufferAttribute( position );

				// process morph attributes if present

				if ( morphAttributesPosition ) {

					for ( var i = 0, il = morphAttributesPosition.length; i < il; i ++ ) {

						var morphAttribute = morphAttributesPosition[ i ];
						_box$2.setFromBufferAttribute( morphAttribute );

						if ( this.morphTargetsRelative ) {

							_vector$4.addVectors( this.boundingBox.min, _box$2.min );
							this.boundingBox.expandByPoint( _vector$4 );

							_vector$4.addVectors( this.boundingBox.max, _box$2.max );
							this.boundingBox.expandByPoint( _vector$4 );

						} 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: function () {

			if ( this.boundingSphere === null ) {

				this.boundingSphere = new Sphere();

			}

			var position = this.attributes.position;
			var morphAttributesPosition = this.morphAttributes.position;

			if ( position ) {

				// first, find the center of the bounding sphere

				var center = this.boundingSphere.center;

				_box$2.setFromBufferAttribute( position );

				// process morph attributes if present

				if ( morphAttributesPosition ) {

					for ( var i = 0, il = morphAttributesPosition.length; i < il; i ++ ) {

						var morphAttribute = morphAttributesPosition[ i ];
						_boxMorphTargets.setFromBufferAttribute( morphAttribute );

						if ( this.morphTargetsRelative ) {

							_vector$4.addVectors( _box$2.min, _boxMorphTargets.min );
							_box$2.expandByPoint( _vector$4 );

							_vector$4.addVectors( _box$2.max, _boxMorphTargets.max );
							_box$2.expandByPoint( _vector$4 );

						} 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

				var maxRadiusSq = 0;

				for ( var i = 0, il = position.count; i < il; i ++ ) {

					_vector$4.fromBufferAttribute( position, i );

					maxRadiusSq = Math.max( maxRadiusSq, center.distanceToSquared( _vector$4 ) );

				}

				// process morph attributes if present

				if ( morphAttributesPosition ) {

					for ( var i = 0, il = morphAttributesPosition.length; i < il; i ++ ) {

						var morphAttribute = morphAttributesPosition[ i ];
						var morphTargetsRelative = this.morphTargetsRelative;

						for ( var j = 0, jl = morphAttribute.count; j < jl; j ++ ) {

							_vector$4.fromBufferAttribute( morphAttribute, j );

							if ( morphTargetsRelative ) {

								_offset.fromBufferAttribute( position, j );
								_vector$4.add( _offset );

							}

							maxRadiusSq = Math.max( maxRadiusSq, center.distanceToSquared( _vector$4 ) );

						}

					}

				}

				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 );

				}

			}

		},

		computeFaceNormals: function () {

			// backwards compatibility

		},

		computeVertexNormals: function () {

			var index = this.index;
			var attributes = this.attributes;

			if ( attributes.position ) {

				var positions = attributes.position.array;

				if ( attributes.normal === undefined ) {

					this.setAttribute( 'normal', new BufferAttribute( new Float32Array( positions.length ), 3 ) );

				} else {

					// reset existing normals to zero

					var array = attributes.normal.array;

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

						array[ i ] = 0;

					}

				}

				var normals = attributes.normal.array;

				var vA, vB, vC;
				var pA = new Vector3(), pB = new Vector3(), pC = new Vector3();
				var cb = new Vector3(), ab = new Vector3();

				// indexed elements

				if ( index ) {

					var indices = index.array;

					for ( var i = 0, il = index.count; i < il; i += 3 ) {

						vA = indices[ i + 0 ] * 3;
						vB = indices[ i + 1 ] * 3;
						vC = indices[ i + 2 ] * 3;

						pA.fromArray( positions, vA );
						pB.fromArray( positions, vB );
						pC.fromArray( positions, vC );

						cb.subVectors( pC, pB );
						ab.subVectors( pA, pB );
						cb.cross( ab );

						normals[ vA ] += cb.x;
						normals[ vA + 1 ] += cb.y;
						normals[ vA + 2 ] += cb.z;

						normals[ vB ] += cb.x;
						normals[ vB + 1 ] += cb.y;
						normals[ vB + 2 ] += cb.z;

						normals[ vC ] += cb.x;
						normals[ vC + 1 ] += cb.y;
						normals[ vC + 2 ] += cb.z;

					}

				} else {

					// non-indexed elements (unconnected triangle soup)

					for ( var i = 0, il = positions.length; i < il; i += 9 ) {

						pA.fromArray( positions, i );
						pB.fromArray( positions, i + 3 );
						pC.fromArray( positions, i + 6 );

						cb.subVectors( pC, pB );
						ab.subVectors( pA, pB );
						cb.cross( ab );

						normals[ i ] = cb.x;
						normals[ i + 1 ] = cb.y;
						normals[ i + 2 ] = cb.z;

						normals[ i + 3 ] = cb.x;
						normals[ i + 4 ] = cb.y;
						normals[ i + 5 ] = cb.z;

						normals[ i + 6 ] = cb.x;
						normals[ i + 7 ] = cb.y;
						normals[ i + 8 ] = cb.z;

					}

				}

				this.normalizeNormals();

				attributes.normal.needsUpdate = true;

			}

		},

		merge: function ( geometry, offset ) {

			if ( ! ( geometry && geometry.isBufferGeometry ) ) {

				console.error( 'THREE.BufferGeometry.merge(): geometry not an instance of THREE.BufferGeometry.', geometry );
				return;

			}

			if ( offset === undefined ) {

				offset = 0;

				console.warn(
					'THREE.BufferGeometry.merge(): Overwriting original geometry, starting at offset=0. '
					+ 'Use BufferGeometryUtils.mergeBufferGeometries() for lossless merge.'
				);

			}

			var attributes = this.attributes;

			for ( var key in attributes ) {

				if ( geometry.attributes[ key ] === undefined ) { continue; }

				var attribute1 = attributes[ key ];
				var attributeArray1 = attribute1.array;

				var attribute2 = geometry.attributes[ key ];
				var attributeArray2 = attribute2.array;

				var attributeOffset = attribute2.itemSize * offset;
				var length = Math.min( attributeArray2.length, attributeArray1.length - attributeOffset );

				for ( var i = 0, j = attributeOffset; i < length; i ++, j ++ ) {

					attributeArray1[ j ] = attributeArray2[ i ];

				}

			}

			return this;

		},

		normalizeNormals: function () {

			var normals = this.attributes.normal;

			for ( var i = 0, il = normals.count; i < il; i ++ ) {

				_vector$4.x = normals.getX( i );
				_vector$4.y = normals.getY( i );
				_vector$4.z = normals.getZ( i );

				_vector$4.normalize();

				normals.setXYZ( i, _vector$4.x, _vector$4.y, _vector$4.z );

			}

		},

		toNonIndexed: function () {

			function convertBufferAttribute( attribute, indices ) {

				var array = attribute.array;
				var itemSize = attribute.itemSize;

				var array2 = new array.constructor( indices.length * itemSize );

				var index = 0, index2 = 0;

				for ( var i = 0, l = indices.length; i < l; i ++ ) {

					index = indices[ i ] * itemSize;

					for ( var j = 0; j < itemSize; j ++ ) {

						array2[ index2 ++ ] = array[ index ++ ];

					}

				}

				return new BufferAttribute( array2, itemSize );

			}

			//

			if ( this.index === null ) {

				console.warn( 'THREE.BufferGeometry.toNonIndexed(): Geometry is already non-indexed.' );
				return this;

			}

			var geometry2 = new BufferGeometry();

			var indices = this.index.array;
			var attributes = this.attributes;

			// attributes

			for ( var name in attributes ) {

				var attribute = attributes[ name ];

				var newAttribute = convertBufferAttribute( attribute, indices );

				geometry2.setAttribute( name, newAttribute );

			}

			// morph attributes

			var morphAttributes = this.morphAttributes;

			for ( name in morphAttributes ) {

				var morphArray = [];
				var morphAttribute = morphAttributes[ name ]; // morphAttribute: array of Float32BufferAttributes

				for ( var i = 0, il = morphAttribute.length; i < il; i ++ ) {

					var attribute = morphAttribute[ i ];

					var newAttribute = convertBufferAttribute( attribute, indices );

					morphArray.push( newAttribute );

				}

				geometry2.morphAttributes[ name ] = morphArray;

			}

			geometry2.morphTargetsRelative = this.morphTargetsRelative;

			// groups

			var groups = this.groups;

			for ( var i = 0, l = groups.length; i < l; i ++ ) {

				var group = groups[ i ];
				geometry2.addGroup( group.start, group.count, group.materialIndex );

			}

			return geometry2;

		},

		toJSON: function () {

			var data = {
				metadata: {
					version: 4.5,
					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 ) {

				var parameters = this.parameters;

				for ( var key in parameters ) {

					if ( parameters[ key ] !== undefined ) { data[ key ] = parameters[ key ]; }

				}

				return data;

			}

			data.data = { attributes: {} };

			var index = this.index;

			if ( index !== null ) {

				data.data.index = {
					type: index.array.constructor.name,
					array: Array.prototype.slice.call( index.array )
				};

			}

			var attributes = this.attributes;

			for ( var key in attributes ) {

				var attribute = attributes[ key ];

				var attributeData = attribute.toJSON();

				if ( attribute.name !== '' ) { attributeData.name = attribute.name; }

				data.data.attributes[ key ] = attributeData;

			}

			var morphAttributes = {};
			var hasMorphAttributes = false;

			for ( var key in this.morphAttributes ) {

				var attributeArray = this.morphAttributes[ key ];

				var array = [];

				for ( var i = 0, il = attributeArray.length; i < il; i ++ ) {

					var attribute = attributeArray[ i ];

					var attributeData = attribute.toJSON();

					if ( attribute.name !== '' ) { attributeData.name = attribute.name; }

					array.push( attributeData );

				}

				if ( array.length > 0 ) {

					morphAttributes[ key ] = array;

					hasMorphAttributes = true;

				}

			}

			if ( hasMorphAttributes ) {

				data.data.morphAttributes = morphAttributes;
				data.data.morphTargetsRelative = this.morphTargetsRelative;

			}

			var groups = this.groups;

			if ( groups.length > 0 ) {

				data.data.groups = JSON.parse( JSON.stringify( groups ) );

			}

			var boundingSphere = this.boundingSphere;

			if ( boundingSphere !== null ) {

				data.data.boundingSphere = {
					center: boundingSphere.center.toArray(),
					radius: boundingSphere.radius
				};

			}

			return data;

		},

		clone: function () {

			/*
			 // Handle primitives

			 var parameters = this.parameters;

			 if ( parameters !== undefined ) {

			 var values = [];

			 for ( var key in parameters ) {

			 values.push( parameters[ key ] );

			 }

			 var geometry = Object.create( this.constructor.prototype );
			 this.constructor.apply( geometry, values );
			 return geometry;

			 }

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

			return new BufferGeometry().copy( this );

		},

		copy: function ( source ) {

			var name, i, l;

			// reset

			this.index = null;
			this.attributes = {};
			this.morphAttributes = {};
			this.groups = [];
			this.boundingBox = null;
			this.boundingSphere = null;

			// name

			this.name = source.name;

			// index

			var index = source.index;

			if ( index !== null ) {

				this.setIndex( index.clone() );

			}

			// attributes

			var attributes = source.attributes;

			for ( name in attributes ) {

				var attribute = attributes[ name ];
				this.setAttribute( name, attribute.clone() );

			}

			// morph attributes

			var morphAttributes = source.morphAttributes;

			for ( name in morphAttributes ) {

				var array = [];
				var morphAttribute = morphAttributes[ name ]; // morphAttribute: array of Float32BufferAttributes

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

					array.push( morphAttribute[ i ].clone() );

				}

				this.morphAttributes[ name ] = array;

			}

			this.morphTargetsRelative = source.morphTargetsRelative;

			// groups

			var groups = source.groups;

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

				var group = groups[ i ];
				this.addGroup( group.start, group.count, group.materialIndex );

			}

			// bounding box

			var boundingBox = source.boundingBox;

			if ( boundingBox !== null ) {

				this.boundingBox = boundingBox.clone();

			}

			// bounding sphere

			var 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: function () {

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

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author alteredq / http://alteredqualia.com/
	 * @author mikael emtinger / http://gomo.se/
	 * @author jonobr1 / http://jonobr1.com/
	 */

	var _inverseMatrix = new Matrix4();
	var _ray = new Ray();
	var _sphere = new Sphere();

	var _vA = new Vector3();
	var _vB = new Vector3();
	var _vC = new Vector3();

	var _tempA = new Vector3();
	var _tempB = new Vector3();
	var _tempC = new Vector3();

	var _morphA = new Vector3();
	var _morphB = new Vector3();
	var _morphC = new Vector3();

	var _uvA = new Vector2();
	var _uvB = new Vector2();
	var _uvC = new Vector2();

	var _intersectionPoint = new Vector3();
	var _intersectionPointWorld = new Vector3();

	function Mesh( geometry, material ) {

		Object3D.call( this );

		this.type = 'Mesh';

		this.geometry = geometry !== undefined ? geometry : new BufferGeometry();
		this.material = material !== undefined ? material : new MeshBasicMaterial();

		this.updateMorphTargets();

	}

	Mesh.prototype = Object.assign( Object.create( Object3D.prototype ), {

		constructor: Mesh,

		isMesh: true,

		copy: function ( source ) {

			Object3D.prototype.copy.call( this, source );

			if ( source.morphTargetInfluences !== undefined ) {

				this.morphTargetInfluences = source.morphTargetInfluences.slice();

			}

			if ( source.morphTargetDictionary !== undefined ) {

				this.morphTargetDictionary = Object.assign( {}, source.morphTargetDictionary );

			}

			return this;

		},

		updateMorphTargets: function () {

			var geometry = this.geometry;
			var m, ml, name;

			if ( geometry.isBufferGeometry ) {

				var morphAttributes = geometry.morphAttributes;
				var keys = Object.keys( morphAttributes );

				if ( keys.length > 0 ) {

					var morphAttribute = morphAttributes[ keys[ 0 ] ];

					if ( morphAttribute !== undefined ) {

						this.morphTargetInfluences = [];
						this.morphTargetDictionary = {};

						for ( m = 0, ml = morphAttribute.length; m < ml; m ++ ) {

							name = morphAttribute[ m ].name || String( m );

							this.morphTargetInfluences.push( 0 );
							this.morphTargetDictionary[ name ] = m;

						}

					}

				}

			} else {

				var morphTargets = geometry.morphTargets;

				if ( morphTargets !== undefined && morphTargets.length > 0 ) {

					console.error( 'THREE.Mesh.updateMorphTargets() no longer supports THREE.Geometry. Use THREE.BufferGeometry instead.' );

				}

			}

		},

		raycast: function ( raycaster, intersects ) {

			var geometry = this.geometry;
			var material = this.material;
			var matrixWorld = this.matrixWorld;

			if ( material === undefined ) { return; }

			// Checking boundingSphere distance to ray

			if ( geometry.boundingSphere === null ) { geometry.computeBoundingSphere(); }

			_sphere.copy( geometry.boundingSphere );
			_sphere.applyMatrix4( matrixWorld );

			if ( raycaster.ray.intersectsSphere( _sphere ) === false ) { return; }

			//

			_inverseMatrix.getInverse( matrixWorld );
			_ray.copy( raycaster.ray ).applyMatrix4( _inverseMatrix );

			// Check boundingBox before continuing

			if ( geometry.boundingBox !== null ) {

				if ( _ray.intersectsBox( geometry.boundingBox ) === false ) { return; }

			}

			var intersection;

			if ( geometry.isBufferGeometry ) {

				var a, b, c;
				var index = geometry.index;
				var position = geometry.attributes.position;
				var morphPosition = geometry.morphAttributes.position;
				var morphTargetsRelative = geometry.morphTargetsRelative;
				var uv = geometry.attributes.uv;
				var uv2 = geometry.attributes.uv2;
				var groups = geometry.groups;
				var drawRange = geometry.drawRange;
				var i, j, il, jl;
				var group, groupMaterial;
				var start, end;

				if ( index !== null ) {

					// indexed buffer geometry

					if ( Array.isArray( material ) ) {

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

							group = groups[ i ];
							groupMaterial = material[ group.materialIndex ];

							start = Math.max( group.start, drawRange.start );
							end = Math.min( ( group.start + group.count ), ( drawRange.start + drawRange.count ) );

							for ( j = start, jl = end; j < jl; j += 3 ) {

								a = index.getX( j );
								b = index.getX( j + 1 );
								c = index.getX( j + 2 );

								intersection = checkBufferGeometryIntersection( this, groupMaterial, raycaster, _ray, position, morphPosition, morphTargetsRelative, uv, uv2, 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 {

						start = Math.max( 0, drawRange.start );
						end = Math.min( index.count, ( drawRange.start + drawRange.count ) );

						for ( i = start, il = end; i < il; i += 3 ) {

							a = index.getX( i );
							b = index.getX( i + 1 );
							c = index.getX( i + 2 );

							intersection = checkBufferGeometryIntersection( this, material, raycaster, _ray, position, morphPosition, morphTargetsRelative, uv, uv2, 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 ( i = 0, il = groups.length; i < il; i ++ ) {

							group = groups[ i ];
							groupMaterial = material[ group.materialIndex ];

							start = Math.max( group.start, drawRange.start );
							end = Math.min( ( group.start + group.count ), ( drawRange.start + drawRange.count ) );

							for ( j = start, jl = end; j < jl; j += 3 ) {

								a = j;
								b = j + 1;
								c = j + 2;

								intersection = checkBufferGeometryIntersection( this, groupMaterial, raycaster, _ray, position, morphPosition, morphTargetsRelative, uv, uv2, 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 {

						start = Math.max( 0, drawRange.start );
						end = Math.min( position.count, ( drawRange.start + drawRange.count ) );

						for ( i = start, il = end; i < il; i += 3 ) {

							a = i;
							b = i + 1;
							c = i + 2;

							intersection = checkBufferGeometryIntersection( this, material, raycaster, _ray, position, morphPosition, morphTargetsRelative, uv, uv2, a, b, c );

							if ( intersection ) {

								intersection.faceIndex = Math.floor( i / 3 ); // triangle number in non-indexed buffer semantics
								intersects.push( intersection );

							}

						}

					}

				}

			} else if ( geometry.isGeometry ) {

				var fvA, fvB, fvC;
				var isMultiMaterial = Array.isArray( material );

				var vertices = geometry.vertices;
				var faces = geometry.faces;
				var uvs;

				var faceVertexUvs = geometry.faceVertexUvs[ 0 ];
				if ( faceVertexUvs.length > 0 ) { uvs = faceVertexUvs; }

				for ( var f = 0, fl = faces.length; f < fl; f ++ ) {

					var face = faces[ f ];
					var faceMaterial = isMultiMaterial ? material[ face.materialIndex ] : material;

					if ( faceMaterial === undefined ) { continue; }

					fvA = vertices[ face.a ];
					fvB = vertices[ face.b ];
					fvC = vertices[ face.c ];

					intersection = checkIntersection( this, faceMaterial, raycaster, _ray, fvA, fvB, fvC, _intersectionPoint );

					if ( intersection ) {

						if ( uvs && uvs[ f ] ) {

							var uvs_f = uvs[ f ];
							_uvA.copy( uvs_f[ 0 ] );
							_uvB.copy( uvs_f[ 1 ] );
							_uvC.copy( uvs_f[ 2 ] );

							intersection.uv = Triangle.getUV( _intersectionPoint, fvA, fvB, fvC, _uvA, _uvB, _uvC, new Vector2() );

						}

						intersection.face = face;
						intersection.faceIndex = f;
						intersects.push( intersection );

					}

				}

			}

		},

		clone: function () {

			return new this.constructor( this.geometry, this.material ).copy( this );

		}

	} );

	function checkIntersection( object, material, raycaster, ray, pA, pB, pC, point ) {

		var intersect;

		if ( material.side === BackSide ) {

			intersect = ray.intersectTriangle( pC, pB, pA, true, point );

		} else {

			intersect = ray.intersectTriangle( pA, pB, pC, material.side !== DoubleSide, point );

		}

		if ( intersect === null ) { return null; }

		_intersectionPointWorld.copy( point );
		_intersectionPointWorld.applyMatrix4( object.matrixWorld );

		var distance = raycaster.ray.origin.distanceTo( _intersectionPointWorld );

		if ( distance < raycaster.near || distance > raycaster.far ) { return null; }

		return {
			distance: distance,
			point: _intersectionPointWorld.clone(),
			object: object
		};

	}

	function checkBufferGeometryIntersection( object, material, raycaster, ray, position, morphPosition, morphTargetsRelative, uv, uv2, a, b, c ) {

		_vA.fromBufferAttribute( position, a );
		_vB.fromBufferAttribute( position, b );
		_vC.fromBufferAttribute( position, c );

		var morphInfluences = object.morphTargetInfluences;

		if ( material.morphTargets && morphPosition && morphInfluences ) {

			_morphA.set( 0, 0, 0 );
			_morphB.set( 0, 0, 0 );
			_morphC.set( 0, 0, 0 );

			for ( var i = 0, il = morphPosition.length; i < il; i ++ ) {

				var influence = morphInfluences[ i ];
				var morphAttribute = morphPosition[ i ];

				if ( influence === 0 ) { continue; }

				_tempA.fromBufferAttribute( morphAttribute, a );
				_tempB.fromBufferAttribute( morphAttribute, b );
				_tempC.fromBufferAttribute( morphAttribute, c );

				if ( morphTargetsRelative ) {

					_morphA.addScaledVector( _tempA, influence );
					_morphB.addScaledVector( _tempB, influence );
					_morphC.addScaledVector( _tempC, influence );

				} else {

					_morphA.addScaledVector( _tempA.sub( _vA ), influence );
					_morphB.addScaledVector( _tempB.sub( _vB ), influence );
					_morphC.addScaledVector( _tempC.sub( _vC ), influence );

				}

			}

			_vA.add( _morphA );
			_vB.add( _morphB );
			_vC.add( _morphC );

		}

		var intersection = checkIntersection( object, material, raycaster, ray, _vA, _vB, _vC, _intersectionPoint );

		if ( intersection ) {

			if ( uv ) {

				_uvA.fromBufferAttribute( uv, a );
				_uvB.fromBufferAttribute( uv, b );
				_uvC.fromBufferAttribute( uv, c );

				intersection.uv = Triangle.getUV( _intersectionPoint, _vA, _vB, _vC, _uvA, _uvB, _uvC, new Vector2() );

			}

			if ( uv2 ) {

				_uvA.fromBufferAttribute( uv2, a );
				_uvB.fromBufferAttribute( uv2, b );
				_uvC.fromBufferAttribute( uv2, c );

				intersection.uv2 = Triangle.getUV( _intersectionPoint, _vA, _vB, _vC, _uvA, _uvB, _uvC, new Vector2() );

			}

			var face = new Face3( a, b, c );
			Triangle.getNormal( _vA, _vB, _vC, face.normal );

			intersection.face = face;

		}

		return intersection;

	}

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author kile / http://kile.stravaganza.org/
	 * @author alteredq / http://alteredqualia.com/
	 * @author mikael emtinger / http://gomo.se/
	 * @author zz85 / http://www.lab4games.net/zz85/blog
	 * @author bhouston / http://clara.io
	 */

	var _geometryId = 0; // Geometry uses even numbers as Id
	var _m1$3 = new Matrix4();
	var _obj$1 = new Object3D();
	var _offset$1 = new Vector3();

	function Geometry() {

		Object.defineProperty( this, 'id', { value: _geometryId += 2 } );

		this.uuid = MathUtils.generateUUID();

		this.name = '';
		this.type = 'Geometry';

		this.vertices = [];
		this.colors = [];
		this.faces = [];
		this.faceVertexUvs = [[]];

		this.morphTargets = [];
		this.morphNormals = [];

		this.skinWeights = [];
		this.skinIndices = [];

		this.lineDistances = [];

		this.boundingBox = null;
		this.boundingSphere = null;

		// update flags

		this.elementsNeedUpdate = false;
		this.verticesNeedUpdate = false;
		this.uvsNeedUpdate = false;
		this.normalsNeedUpdate = false;
		this.colorsNeedUpdate = false;
		this.lineDistancesNeedUpdate = false;
		this.groupsNeedUpdate = false;

	}

	Geometry.prototype = Object.assign( Object.create( EventDispatcher.prototype ), {

		constructor: Geometry,

		isGeometry: true,

		applyMatrix4: function ( matrix ) {

			var normalMatrix = new Matrix3().getNormalMatrix( matrix );

			for ( var i = 0, il = this.vertices.length; i < il; i ++ ) {

				var vertex = this.vertices[ i ];
				vertex.applyMatrix4( matrix );

			}

			for ( var i = 0, il = this.faces.length; i < il; i ++ ) {

				var face = this.faces[ i ];
				face.normal.applyMatrix3( normalMatrix ).normalize();

				for ( var j = 0, jl = face.vertexNormals.length; j < jl; j ++ ) {

					face.vertexNormals[ j ].applyMatrix3( normalMatrix ).normalize();

				}

			}

			if ( this.boundingBox !== null ) {

				this.computeBoundingBox();

			}

			if ( this.boundingSphere !== null ) {

				this.computeBoundingSphere();

			}

			this.verticesNeedUpdate = true;
			this.normalsNeedUpdate = true;

			return this;

		},

		rotateX: function ( angle ) {

			// rotate geometry around world x-axis

			_m1$3.makeRotationX( angle );

			this.applyMatrix4( _m1$3 );

			return this;

		},

		rotateY: function ( angle ) {

			// rotate geometry around world y-axis

			_m1$3.makeRotationY( angle );

			this.applyMatrix4( _m1$3 );

			return this;

		},

		rotateZ: function ( angle ) {

			// rotate geometry around world z-axis

			_m1$3.makeRotationZ( angle );

			this.applyMatrix4( _m1$3 );

			return this;

		},

		translate: function ( x, y, z ) {

			// translate geometry

			_m1$3.makeTranslation( x, y, z );

			this.applyMatrix4( _m1$3 );

			return this;

		},

		scale: function ( x, y, z ) {

			// scale geometry

			_m1$3.makeScale( x, y, z );

			this.applyMatrix4( _m1$3 );

			return this;

		},

		lookAt: function ( vector ) {

			_obj$1.lookAt( vector );

			_obj$1.updateMatrix();

			this.applyMatrix4( _obj$1.matrix );

			return this;

		},

		fromBufferGeometry: function ( geometry ) {

			var scope = this;

			var indices = geometry.index !== null ? geometry.index.array : undefined;
			var attributes = geometry.attributes;

			if ( attributes.position === undefined ) {

				console.error( 'THREE.Geometry.fromBufferGeometry(): Position attribute required for conversion.' );
				return this;

			}

			var positions = attributes.position.array;
			var normals = attributes.normal !== undefined ? attributes.normal.array : undefined;
			var colors = attributes.color !== undefined ? attributes.color.array : undefined;
			var uvs = attributes.uv !== undefined ? attributes.uv.array : undefined;
			var uvs2 = attributes.uv2 !== undefined ? attributes.uv2.array : undefined;

			if ( uvs2 !== undefined ) { this.faceVertexUvs[ 1 ] = []; }

			for ( var i = 0; i < positions.length; i += 3 ) {

				scope.vertices.push( new Vector3().fromArray( positions, i ) );

				if ( colors !== undefined ) {

					scope.colors.push( new Color().fromArray( colors, i ) );

				}

			}

			function addFace( a, b, c, materialIndex ) {

				var vertexColors = ( colors === undefined ) ? [] : [
					scope.colors[ a ].clone(),
					scope.colors[ b ].clone(),
					scope.colors[ c ].clone() ];

				var vertexNormals = ( normals === undefined ) ? [] : [
					new Vector3().fromArray( normals, a * 3 ),
					new Vector3().fromArray( normals, b * 3 ),
					new Vector3().fromArray( normals, c * 3 )
				];

				var face = new Face3( a, b, c, vertexNormals, vertexColors, materialIndex );

				scope.faces.push( face );

				if ( uvs !== undefined ) {

					scope.faceVertexUvs[ 0 ].push( [
						new Vector2().fromArray( uvs, a * 2 ),
						new Vector2().fromArray( uvs, b * 2 ),
						new Vector2().fromArray( uvs, c * 2 )
					] );

				}

				if ( uvs2 !== undefined ) {

					scope.faceVertexUvs[ 1 ].push( [
						new Vector2().fromArray( uvs2, a * 2 ),
						new Vector2().fromArray( uvs2, b * 2 ),
						new Vector2().fromArray( uvs2, c * 2 )
					] );

				}

			}

			var groups = geometry.groups;

			if ( groups.length > 0 ) {

				for ( var i = 0; i < groups.length; i ++ ) {

					var group = groups[ i ];

					var start = group.start;
					var count = group.count;

					for ( var j = start, jl = start + count; j < jl; j += 3 ) {

						if ( indices !== undefined ) {

							addFace( indices[ j ], indices[ j + 1 ], indices[ j + 2 ], group.materialIndex );

						} else {

							addFace( j, j + 1, j + 2, group.materialIndex );

						}

					}

				}

			} else {

				if ( indices !== undefined ) {

					for ( var i = 0; i < indices.length; i += 3 ) {

						addFace( indices[ i ], indices[ i + 1 ], indices[ i + 2 ] );

					}

				} else {

					for ( var i = 0; i < positions.length / 3; i += 3 ) {

						addFace( i, i + 1, i + 2 );

					}

				}

			}

			this.computeFaceNormals();

			if ( geometry.boundingBox !== null ) {

				this.boundingBox = geometry.boundingBox.clone();

			}

			if ( geometry.boundingSphere !== null ) {

				this.boundingSphere = geometry.boundingSphere.clone();

			}

			return this;

		},

		center: function () {

			this.computeBoundingBox();

			this.boundingBox.getCenter( _offset$1 ).negate();

			this.translate( _offset$1.x, _offset$1.y, _offset$1.z );

			return this;

		},

		normalize: function () {

			this.computeBoundingSphere();

			var center = this.boundingSphere.center;
			var radius = this.boundingSphere.radius;

			var s = radius === 0 ? 1 : 1.0 / radius;

			var matrix = new Matrix4();
			matrix.set(
				s, 0, 0, - s * center.x,
				0, s, 0, - s * center.y,
				0, 0, s, - s * center.z,
				0, 0, 0, 1
			);

			this.applyMatrix4( matrix );

			return this;

		},

		computeFaceNormals: function () {

			var cb = new Vector3(), ab = new Vector3();

			for ( var f = 0, fl = this.faces.length; f < fl; f ++ ) {

				var face = this.faces[ f ];

				var vA = this.vertices[ face.a ];
				var vB = this.vertices[ face.b ];
				var vC = this.vertices[ face.c ];

				cb.subVectors( vC, vB );
				ab.subVectors( vA, vB );
				cb.cross( ab );

				cb.normalize();

				face.normal.copy( cb );

			}

		},

		computeVertexNormals: function ( areaWeighted ) {

			if ( areaWeighted === undefined ) { areaWeighted = true; }

			var v, vl, f, fl, face, vertices;

			vertices = new Array( this.vertices.length );

			for ( v = 0, vl = this.vertices.length; v < vl; v ++ ) {

				vertices[ v ] = new Vector3();

			}

			if ( areaWeighted ) {

				// vertex normals weighted by triangle areas
				// http://www.iquilezles.org/www/articles/normals/normals.htm

				var vA, vB, vC;
				var cb = new Vector3(), ab = new Vector3();

				for ( f = 0, fl = this.faces.length; f < fl; f ++ ) {

					face = this.faces[ f ];

					vA = this.vertices[ face.a ];
					vB = this.vertices[ face.b ];
					vC = this.vertices[ face.c ];

					cb.subVectors( vC, vB );
					ab.subVectors( vA, vB );
					cb.cross( ab );

					vertices[ face.a ].add( cb );
					vertices[ face.b ].add( cb );
					vertices[ face.c ].add( cb );

				}

			} else {

				this.computeFaceNormals();

				for ( f = 0, fl = this.faces.length; f < fl; f ++ ) {

					face = this.faces[ f ];

					vertices[ face.a ].add( face.normal );
					vertices[ face.b ].add( face.normal );
					vertices[ face.c ].add( face.normal );

				}

			}

			for ( v = 0, vl = this.vertices.length; v < vl; v ++ ) {

				vertices[ v ].normalize();

			}

			for ( f = 0, fl = this.faces.length; f < fl; f ++ ) {

				face = this.faces[ f ];

				var vertexNormals = face.vertexNormals;

				if ( vertexNormals.length === 3 ) {

					vertexNormals[ 0 ].copy( vertices[ face.a ] );
					vertexNormals[ 1 ].copy( vertices[ face.b ] );
					vertexNormals[ 2 ].copy( vertices[ face.c ] );

				} else {

					vertexNormals[ 0 ] = vertices[ face.a ].clone();
					vertexNormals[ 1 ] = vertices[ face.b ].clone();
					vertexNormals[ 2 ] = vertices[ face.c ].clone();

				}

			}

			if ( this.faces.length > 0 ) {

				this.normalsNeedUpdate = true;

			}

		},

		computeFlatVertexNormals: function () {

			var f, fl, face;

			this.computeFaceNormals();

			for ( f = 0, fl = this.faces.length; f < fl; f ++ ) {

				face = this.faces[ f ];

				var vertexNormals = face.vertexNormals;

				if ( vertexNormals.length === 3 ) {

					vertexNormals[ 0 ].copy( face.normal );
					vertexNormals[ 1 ].copy( face.normal );
					vertexNormals[ 2 ].copy( face.normal );

				} else {

					vertexNormals[ 0 ] = face.normal.clone();
					vertexNormals[ 1 ] = face.normal.clone();
					vertexNormals[ 2 ] = face.normal.clone();

				}

			}

			if ( this.faces.length > 0 ) {

				this.normalsNeedUpdate = true;

			}

		},

		computeMorphNormals: function () {

			var i, il, f, fl, face;

			// save original normals
			// - create temp variables on first access
			//   otherwise just copy (for faster repeated calls)

			for ( f = 0, fl = this.faces.length; f < fl; f ++ ) {

				face = this.faces[ f ];

				if ( ! face.__originalFaceNormal ) {

					face.__originalFaceNormal = face.normal.clone();

				} else {

					face.__originalFaceNormal.copy( face.normal );

				}

				if ( ! face.__originalVertexNormals ) { face.__originalVertexNormals = []; }

				for ( i = 0, il = face.vertexNormals.length; i < il; i ++ ) {

					if ( ! face.__originalVertexNormals[ i ] ) {

						face.__originalVertexNormals[ i ] = face.vertexNormals[ i ].clone();

					} else {

						face.__originalVertexNormals[ i ].copy( face.vertexNormals[ i ] );

					}

				}

			}

			// use temp geometry to compute face and vertex normals for each morph

			var tmpGeo = new Geometry();
			tmpGeo.faces = this.faces;

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

				// create on first access

				if ( ! this.morphNormals[ i ] ) {

					this.morphNormals[ i ] = {};
					this.morphNormals[ i ].faceNormals = [];
					this.morphNormals[ i ].vertexNormals = [];

					var dstNormalsFace = this.morphNormals[ i ].faceNormals;
					var dstNormalsVertex = this.morphNormals[ i ].vertexNormals;

					var faceNormal, vertexNormals;

					for ( f = 0, fl = this.faces.length; f < fl; f ++ ) {

						faceNormal = new Vector3();
						vertexNormals = { a: new Vector3(), b: new Vector3(), c: new Vector3() };

						dstNormalsFace.push( faceNormal );
						dstNormalsVertex.push( vertexNormals );

					}

				}

				var morphNormals = this.morphNormals[ i ];

				// set vertices to morph target

				tmpGeo.vertices = this.morphTargets[ i ].vertices;

				// compute morph normals

				tmpGeo.computeFaceNormals();
				tmpGeo.computeVertexNormals();

				// store morph normals

				var faceNormal, vertexNormals;

				for ( f = 0, fl = this.faces.length; f < fl; f ++ ) {

					face = this.faces[ f ];

					faceNormal = morphNormals.faceNormals[ f ];
					vertexNormals = morphNormals.vertexNormals[ f ];

					faceNormal.copy( face.normal );

					vertexNormals.a.copy( face.vertexNormals[ 0 ] );
					vertexNormals.b.copy( face.vertexNormals[ 1 ] );
					vertexNormals.c.copy( face.vertexNormals[ 2 ] );

				}

			}

			// restore original normals

			for ( f = 0, fl = this.faces.length; f < fl; f ++ ) {

				face = this.faces[ f ];

				face.normal = face.__originalFaceNormal;
				face.vertexNormals = face.__originalVertexNormals;

			}

		},

		computeBoundingBox: function () {

			if ( this.boundingBox === null ) {

				this.boundingBox = new Box3();

			}

			this.boundingBox.setFromPoints( this.vertices );

		},

		computeBoundingSphere: function () {

			if ( this.boundingSphere === null ) {

				this.boundingSphere = new Sphere();

			}

			this.boundingSphere.setFromPoints( this.vertices );

		},

		merge: function ( geometry, matrix, materialIndexOffset ) {

			if ( ! ( geometry && geometry.isGeometry ) ) {

				console.error( 'THREE.Geometry.merge(): geometry not an instance of THREE.Geometry.', geometry );
				return;

			}

			var normalMatrix,
				vertexOffset = this.vertices.length,
				vertices1 = this.vertices,
				vertices2 = geometry.vertices,
				faces1 = this.faces,
				faces2 = geometry.faces,
				colors1 = this.colors,
				colors2 = geometry.colors;

			if ( materialIndexOffset === undefined ) { materialIndexOffset = 0; }

			if ( matrix !== undefined ) {

				normalMatrix = new Matrix3().getNormalMatrix( matrix );

			}

			// vertices

			for ( var i = 0, il = vertices2.length; i < il; i ++ ) {

				var vertex = vertices2[ i ];

				var vertexCopy = vertex.clone();

				if ( matrix !== undefined ) { vertexCopy.applyMatrix4( matrix ); }

				vertices1.push( vertexCopy );

			}

			// colors

			for ( var i = 0, il = colors2.length; i < il; i ++ ) {

				colors1.push( colors2[ i ].clone() );

			}

			// faces

			for ( i = 0, il = faces2.length; i < il; i ++ ) {

				var face = faces2[ i ], faceCopy, normal, color,
					faceVertexNormals = face.vertexNormals,
					faceVertexColors = face.vertexColors;

				faceCopy = new Face3( face.a + vertexOffset, face.b + vertexOffset, face.c + vertexOffset );
				faceCopy.normal.copy( face.normal );

				if ( normalMatrix !== undefined ) {

					faceCopy.normal.applyMatrix3( normalMatrix ).normalize();

				}

				for ( var j = 0, jl = faceVertexNormals.length; j < jl; j ++ ) {

					normal = faceVertexNormals[ j ].clone();

					if ( normalMatrix !== undefined ) {

						normal.applyMatrix3( normalMatrix ).normalize();

					}

					faceCopy.vertexNormals.push( normal );

				}

				faceCopy.color.copy( face.color );

				for ( var j = 0, jl = faceVertexColors.length; j < jl; j ++ ) {

					color = faceVertexColors[ j ];
					faceCopy.vertexColors.push( color.clone() );

				}

				faceCopy.materialIndex = face.materialIndex + materialIndexOffset;

				faces1.push( faceCopy );

			}

			// uvs

			for ( var i = 0, il = geometry.faceVertexUvs.length; i < il; i ++ ) {

				var faceVertexUvs2 = geometry.faceVertexUvs[ i ];

				if ( this.faceVertexUvs[ i ] === undefined ) { this.faceVertexUvs[ i ] = []; }

				for ( var j = 0, jl = faceVertexUvs2.length; j < jl; j ++ ) {

					var uvs2 = faceVertexUvs2[ j ], uvsCopy = [];

					for ( var k = 0, kl = uvs2.length; k < kl; k ++ ) {

						uvsCopy.push( uvs2[ k ].clone() );

					}

					this.faceVertexUvs[ i ].push( uvsCopy );

				}

			}

		},

		mergeMesh: function ( mesh ) {

			if ( ! ( mesh && mesh.isMesh ) ) {

				console.error( 'THREE.Geometry.mergeMesh(): mesh not an instance of THREE.Mesh.', mesh );
				return;

			}

			if ( mesh.matrixAutoUpdate ) { mesh.updateMatrix(); }

			this.merge( mesh.geometry, mesh.matrix );

		},

		/*
		 * Checks for duplicate vertices with hashmap.
		 * Duplicated vertices are removed
		 * and faces' vertices are updated.
		 */

		mergeVertices: function () {

			var verticesMap = {}; // Hashmap for looking up vertices by position coordinates (and making sure they are unique)
			var unique = [], changes = [];

			var v, key;
			var precisionPoints = 4; // number of decimal points, e.g. 4 for epsilon of 0.0001
			var precision = Math.pow( 10, precisionPoints );
			var i, il, face;
			var indices, j, jl;

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

				v = this.vertices[ i ];
				key = Math.round( v.x * precision ) + '_' + Math.round( v.y * precision ) + '_' + Math.round( v.z * precision );

				if ( verticesMap[ key ] === undefined ) {

					verticesMap[ key ] = i;
					unique.push( this.vertices[ i ] );
					changes[ i ] = unique.length - 1;

				} else {

					//console.log('Duplicate vertex found. ', i, ' could be using ', verticesMap[key]);
					changes[ i ] = changes[ verticesMap[ key ] ];

				}

			}


			// if faces are completely degenerate after merging vertices, we
			// have to remove them from the geometry.
			var faceIndicesToRemove = [];

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

				face = this.faces[ i ];

				face.a = changes[ face.a ];
				face.b = changes[ face.b ];
				face.c = changes[ face.c ];

				indices = [ face.a, face.b, face.c ];

				// if any duplicate vertices are found in a Face3
				// we have to remove the face as nothing can be saved
				for ( var n = 0; n < 3; n ++ ) {

					if ( indices[ n ] === indices[ ( n + 1 ) % 3 ] ) {

						faceIndicesToRemove.push( i );
						break;

					}

				}

			}

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

				var idx = faceIndicesToRemove[ i ];

				this.faces.splice( idx, 1 );

				for ( j = 0, jl = this.faceVertexUvs.length; j < jl; j ++ ) {

					this.faceVertexUvs[ j ].splice( idx, 1 );

				}

			}

			// Use unique set of vertices

			var diff = this.vertices.length - unique.length;
			this.vertices = unique;
			return diff;

		},

		setFromPoints: function ( points ) {

			this.vertices = [];

			for ( var i = 0, l = points.length; i < l; i ++ ) {

				var point = points[ i ];
				this.vertices.push( new Vector3( point.x, point.y, point.z || 0 ) );

			}

			return this;

		},

		sortFacesByMaterialIndex: function () {

			var faces = this.faces;
			var length = faces.length;

			// tag faces

			for ( var i = 0; i < length; i ++ ) {

				faces[ i ]._id = i;

			}

			// sort faces

			function materialIndexSort( a, b ) {

				return a.materialIndex - b.materialIndex;

			}

			faces.sort( materialIndexSort );

			// sort uvs

			var uvs1 = this.faceVertexUvs[ 0 ];
			var uvs2 = this.faceVertexUvs[ 1 ];

			var newUvs1, newUvs2;

			if ( uvs1 && uvs1.length === length ) { newUvs1 = []; }
			if ( uvs2 && uvs2.length === length ) { newUvs2 = []; }

			for ( var i = 0; i < length; i ++ ) {

				var id = faces[ i ]._id;

				if ( newUvs1 ) { newUvs1.push( uvs1[ id ] ); }
				if ( newUvs2 ) { newUvs2.push( uvs2[ id ] ); }

			}

			if ( newUvs1 ) { this.faceVertexUvs[ 0 ] = newUvs1; }
			if ( newUvs2 ) { this.faceVertexUvs[ 1 ] = newUvs2; }

		},

		toJSON: function () {

			var data = {
				metadata: {
					version: 4.5,
					type: 'Geometry',
					generator: 'Geometry.toJSON'
				}
			};

			// standard Geometry serialization

			data.uuid = this.uuid;
			data.type = this.type;
			if ( this.name !== '' ) { data.name = this.name; }

			if ( this.parameters !== undefined ) {

				var parameters = this.parameters;

				for ( var key in parameters ) {

					if ( parameters[ key ] !== undefined ) { data[ key ] = parameters[ key ]; }

				}

				return data;

			}

			var vertices = [];

			for ( var i = 0; i < this.vertices.length; i ++ ) {

				var vertex = this.vertices[ i ];
				vertices.push( vertex.x, vertex.y, vertex.z );

			}

			var faces = [];
			var normals = [];
			var normalsHash = {};
			var colors = [];
			var colorsHash = {};
			var uvs = [];
			var uvsHash = {};

			for ( var i = 0; i < this.faces.length; i ++ ) {

				var face = this.faces[ i ];

				var hasMaterial = true;
				var hasFaceUv = false; // deprecated
				var hasFaceVertexUv = this.faceVertexUvs[ 0 ][ i ] !== undefined;
				var hasFaceNormal = face.normal.length() > 0;
				var hasFaceVertexNormal = face.vertexNormals.length > 0;
				var hasFaceColor = face.color.r !== 1 || face.color.g !== 1 || face.color.b !== 1;
				var hasFaceVertexColor = face.vertexColors.length > 0;

				var faceType = 0;

				faceType = setBit( faceType, 0, 0 ); // isQuad
				faceType = setBit( faceType, 1, hasMaterial );
				faceType = setBit( faceType, 2, hasFaceUv );
				faceType = setBit( faceType, 3, hasFaceVertexUv );
				faceType = setBit( faceType, 4, hasFaceNormal );
				faceType = setBit( faceType, 5, hasFaceVertexNormal );
				faceType = setBit( faceType, 6, hasFaceColor );
				faceType = setBit( faceType, 7, hasFaceVertexColor );

				faces.push( faceType );
				faces.push( face.a, face.b, face.c );
				faces.push( face.materialIndex );

				if ( hasFaceVertexUv ) {

					var faceVertexUvs = this.faceVertexUvs[ 0 ][ i ];

					faces.push(
						getUvIndex( faceVertexUvs[ 0 ] ),
						getUvIndex( faceVertexUvs[ 1 ] ),
						getUvIndex( faceVertexUvs[ 2 ] )
					);

				}

				if ( hasFaceNormal ) {

					faces.push( getNormalIndex( face.normal ) );

				}

				if ( hasFaceVertexNormal ) {

					var vertexNormals = face.vertexNormals;

					faces.push(
						getNormalIndex( vertexNormals[ 0 ] ),
						getNormalIndex( vertexNormals[ 1 ] ),
						getNormalIndex( vertexNormals[ 2 ] )
					);

				}

				if ( hasFaceColor ) {

					faces.push( getColorIndex( face.color ) );

				}

				if ( hasFaceVertexColor ) {

					var vertexColors = face.vertexColors;

					faces.push(
						getColorIndex( vertexColors[ 0 ] ),
						getColorIndex( vertexColors[ 1 ] ),
						getColorIndex( vertexColors[ 2 ] )
					);

				}

			}

			function setBit( value, position, enabled ) {

				return enabled ? value | ( 1 << position ) : value & ( ~ ( 1 << position ) );

			}

			function getNormalIndex( normal ) {

				var hash = normal.x.toString() + normal.y.toString() + normal.z.toString();

				if ( normalsHash[ hash ] !== undefined ) {

					return normalsHash[ hash ];

				}

				normalsHash[ hash ] = normals.length / 3;
				normals.push( normal.x, normal.y, normal.z );

				return normalsHash[ hash ];

			}

			function getColorIndex( color ) {

				var hash = color.r.toString() + color.g.toString() + color.b.toString();

				if ( colorsHash[ hash ] !== undefined ) {

					return colorsHash[ hash ];

				}

				colorsHash[ hash ] = colors.length;
				colors.push( color.getHex() );

				return colorsHash[ hash ];

			}

			function getUvIndex( uv ) {

				var hash = uv.x.toString() + uv.y.toString();

				if ( uvsHash[ hash ] !== undefined ) {

					return uvsHash[ hash ];

				}

				uvsHash[ hash ] = uvs.length / 2;
				uvs.push( uv.x, uv.y );

				return uvsHash[ hash ];

			}

			data.data = {};

			data.data.vertices = vertices;
			data.data.normals = normals;
			if ( colors.length > 0 ) { data.data.colors = colors; }
			if ( uvs.length > 0 ) { data.data.uvs = [ uvs ]; } // temporal backward compatibility
			data.data.faces = faces;

			return data;

		},

		clone: function () {

			/*
			 // Handle primitives

			 var parameters = this.parameters;

			 if ( parameters !== undefined ) {

			 var values = [];

			 for ( var key in parameters ) {

			 values.push( parameters[ key ] );

			 }

			 var geometry = Object.create( this.constructor.prototype );
			 this.constructor.apply( geometry, values );
			 return geometry;

			 }

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

			return new Geometry().copy( this );

		},

		copy: function ( source ) {

			var i, il, j, jl, k, kl;

			// reset

			this.vertices = [];
			this.colors = [];
			this.faces = [];
			this.faceVertexUvs = [[]];
			this.morphTargets = [];
			this.morphNormals = [];
			this.skinWeights = [];
			this.skinIndices = [];
			this.lineDistances = [];
			this.boundingBox = null;
			this.boundingSphere = null;

			// name

			this.name = source.name;

			// vertices

			var vertices = source.vertices;

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

				this.vertices.push( vertices[ i ].clone() );

			}

			// colors

			var colors = source.colors;

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

				this.colors.push( colors[ i ].clone() );

			}

			// faces

			var faces = source.faces;

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

				this.faces.push( faces[ i ].clone() );

			}

			// face vertex uvs

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

				var faceVertexUvs = source.faceVertexUvs[ i ];

				if ( this.faceVertexUvs[ i ] === undefined ) {

					this.faceVertexUvs[ i ] = [];

				}

				for ( j = 0, jl = faceVertexUvs.length; j < jl; j ++ ) {

					var uvs = faceVertexUvs[ j ], uvsCopy = [];

					for ( k = 0, kl = uvs.length; k < kl; k ++ ) {

						var uv = uvs[ k ];

						uvsCopy.push( uv.clone() );

					}

					this.faceVertexUvs[ i ].push( uvsCopy );

				}

			}

			// morph targets

			var morphTargets = source.morphTargets;

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

				var morphTarget = {};
				morphTarget.name = morphTargets[ i ].name;

				// vertices

				if ( morphTargets[ i ].vertices !== undefined ) {

					morphTarget.vertices = [];

					for ( j = 0, jl = morphTargets[ i ].vertices.length; j < jl; j ++ ) {

						morphTarget.vertices.push( morphTargets[ i ].vertices[ j ].clone() );

					}

				}

				// normals

				if ( morphTargets[ i ].normals !== undefined ) {

					morphTarget.normals = [];

					for ( j = 0, jl = morphTargets[ i ].normals.length; j < jl; j ++ ) {

						morphTarget.normals.push( morphTargets[ i ].normals[ j ].clone() );

					}

				}

				this.morphTargets.push( morphTarget );

			}

			// morph normals

			var morphNormals = source.morphNormals;

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

				var morphNormal = {};

				// vertex normals

				if ( morphNormals[ i ].vertexNormals !== undefined ) {

					morphNormal.vertexNormals = [];

					for ( j = 0, jl = morphNormals[ i ].vertexNormals.length; j < jl; j ++ ) {

						var srcVertexNormal = morphNormals[ i ].vertexNormals[ j ];
						var destVertexNormal = {};

						destVertexNormal.a = srcVertexNormal.a.clone();
						destVertexNormal.b = srcVertexNormal.b.clone();
						destVertexNormal.c = srcVertexNormal.c.clone();

						morphNormal.vertexNormals.push( destVertexNormal );

					}

				}

				// face normals

				if ( morphNormals[ i ].faceNormals !== undefined ) {

					morphNormal.faceNormals = [];

					for ( j = 0, jl = morphNormals[ i ].faceNormals.length; j < jl; j ++ ) {

						morphNormal.faceNormals.push( morphNormals[ i ].faceNormals[ j ].clone() );

					}

				}

				this.morphNormals.push( morphNormal );

			}

			// skin weights

			var skinWeights = source.skinWeights;

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

				this.skinWeights.push( skinWeights[ i ].clone() );

			}

			// skin indices

			var skinIndices = source.skinIndices;

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

				this.skinIndices.push( skinIndices[ i ].clone() );

			}

			// line distances

			var lineDistances = source.lineDistances;

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

				this.lineDistances.push( lineDistances[ i ] );

			}

			// bounding box

			var boundingBox = source.boundingBox;

			if ( boundingBox !== null ) {

				this.boundingBox = boundingBox.clone();

			}

			// bounding sphere

			var boundingSphere = source.boundingSphere;

			if ( boundingSphere !== null ) {

				this.boundingSphere = boundingSphere.clone();

			}

			// update flags

			this.elementsNeedUpdate = source.elementsNeedUpdate;
			this.verticesNeedUpdate = source.verticesNeedUpdate;
			this.uvsNeedUpdate = source.uvsNeedUpdate;
			this.normalsNeedUpdate = source.normalsNeedUpdate;
			this.colorsNeedUpdate = source.colorsNeedUpdate;
			this.lineDistancesNeedUpdate = source.lineDistancesNeedUpdate;
			this.groupsNeedUpdate = source.groupsNeedUpdate;

			return this;

		},

		dispose: function () {

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

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author Mugen87 / https://github.com/Mugen87
	 */

	// BoxGeometry

	var BoxGeometry = /*@__PURE__*/(function (Geometry) {
		function BoxGeometry( width, height, depth, widthSegments, heightSegments, depthSegments ) {

			Geometry.call(this);

			this.type = 'BoxGeometry';

			this.parameters = {
				width: width,
				height: height,
				depth: depth,
				widthSegments: widthSegments,
				heightSegments: heightSegments,
				depthSegments: depthSegments
			};

			this.fromBufferGeometry( new BoxBufferGeometry( width, height, depth, widthSegments, heightSegments, depthSegments ) );
			this.mergeVertices();

		}

		if ( Geometry ) BoxGeometry.__proto__ = Geometry;
		BoxGeometry.prototype = Object.create( Geometry && Geometry.prototype );
		BoxGeometry.prototype.constructor = BoxGeometry;

		return BoxGeometry;
	}(Geometry));

	// BoxBufferGeometry

	var BoxBufferGeometry = /*@__PURE__*/(function (BufferGeometry) {
		function BoxBufferGeometry( width, height, depth, widthSegments, heightSegments, depthSegments ) {

			BufferGeometry.call(this);

			this.type = 'BoxBufferGeometry';

			this.parameters = {
				width: width,
				height: height,
				depth: depth,
				widthSegments: widthSegments,
				heightSegments: heightSegments,
				depthSegments: depthSegments
			};

			var scope = this;

			width = width || 1;
			height = height || 1;
			depth = depth || 1;

			// segments

			widthSegments = Math.floor( widthSegments ) || 1;
			heightSegments = Math.floor( heightSegments ) || 1;
			depthSegments = Math.floor( depthSegments ) || 1;

			// buffers

			var indices = [];
			var vertices = [];
			var normals = [];
			var uvs = [];

			// helper variables

			var numberOfVertices = 0;
			var 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 ) {

				var segmentWidth = width / gridX;
				var segmentHeight = height / gridY;

				var widthHalf = width / 2;
				var heightHalf = height / 2;
				var depthHalf = depth / 2;

				var gridX1 = gridX + 1;
				var gridY1 = gridY + 1;

				var vertexCounter = 0;
				var groupCount = 0;

				var ix, iy;

				var vector = new Vector3();

				// generate vertices, normals and uvs

				for ( iy = 0; iy < gridY1; iy ++ ) {

					var y = iy * segmentHeight - heightHalf;

					for ( ix = 0; ix < gridX1; ix ++ ) {

						var 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 ( iy = 0; iy < gridY; iy ++ ) {

					for ( ix = 0; ix < gridX; ix ++ ) {

						var a = numberOfVertices + ix + gridX1 * iy;
						var b = numberOfVertices + ix + gridX1 * ( iy + 1 );
						var c = numberOfVertices + ( ix + 1 ) + gridX1 * ( iy + 1 );
						var 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;

			}

		}

		if ( BufferGeometry ) BoxBufferGeometry.__proto__ = BufferGeometry;
		BoxBufferGeometry.prototype = Object.create( BufferGeometry && BufferGeometry.prototype );
		BoxBufferGeometry.prototype.constructor = BoxBufferGeometry;

		return BoxBufferGeometry;
	}(BufferGeometry));

	/**
	 * Uniform Utilities
	 */

	function cloneUniforms( src ) {

		var dst = {};

		for ( var u in src ) {

			dst[ u ] = {};

			for ( var p in src[ u ] ) {

				var property = src[ u ][ p ];

				if ( property && ( property.isColor ||
					property.isMatrix3 || property.isMatrix4 ||
					property.isVector2 || property.isVector3 || property.isVector4 ||
					property.isTexture ) ) {

					dst[ u ][ p ] = property.clone();

				} else if ( Array.isArray( property ) ) {

					dst[ u ][ p ] = property.slice();

				} else {

					dst[ u ][ p ] = property;

				}

			}

		}

		return dst;

	}

	function mergeUniforms( uniforms ) {

		var merged = {};

		for ( var u = 0; u < uniforms.length; u ++ ) {

			var tmp = cloneUniforms( uniforms[ u ] );

			for ( var p in tmp ) {

				merged[ p ] = tmp[ p ];

			}

		}

		return merged;

	}

	// Legacy

	var UniformsUtils = { clone: cloneUniforms, merge: mergeUniforms };

	var default_vertex = "void main() {\n\tgl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );\n}";

	var default_fragment = "void main() {\n\tgl_FragColor = vec4( 1.0, 0.0, 0.0, 1.0 );\n}";

	/**
	 * @author alteredq / http://alteredqualia.com/
	 *
	 * parameters = {
	 *  defines: { "label" : "value" },
	 *  uniforms: { "parameter1": { value: 1.0 }, "parameter2": { value2: 2 } },
	 *
	 *  fragmentShader: <string>,
	 *  vertexShader: <string>,
	 *
	 *  wireframe: <boolean>,
	 *  wireframeLinewidth: <float>,
	 *
	 *  lights: <bool>,
	 *
	 *  skinning: <bool>,
	 *  morphTargets: <bool>,
	 *  morphNormals: <bool>
	 * }
	 */

	function ShaderMaterial( parameters ) {

		Material.call( this );

		this.type = 'ShaderMaterial';

		this.defines = {};
		this.uniforms = {};

		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.skinning = false; // set to use skinning attribute streams
		this.morphTargets = false; // set to use morph targets
		this.morphNormals = false; // set to use morph normals

		this.extensions = {
			derivatives: false, // set to use derivatives
			fragDepth: false, // set to use fragment depth values
			drawBuffers: false, // set to use draw buffers
			shaderTextureLOD: false // set to use shader texture LOD
		};

		// 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 ],
			'uv2': [ 0, 0 ]
		};

		this.index0AttributeName = undefined;
		this.uniformsNeedUpdate = false;

		if ( parameters !== undefined ) {

			if ( parameters.attributes !== undefined ) {

				console.error( 'THREE.ShaderMaterial: attributes should now be defined in THREE.BufferGeometry instead.' );

			}

			this.setValues( parameters );

		}

	}

	ShaderMaterial.prototype = Object.create( Material.prototype );
	ShaderMaterial.prototype.constructor = ShaderMaterial;

	ShaderMaterial.prototype.isShaderMaterial = true;

	ShaderMaterial.prototype.copy = function ( source ) {

		Material.prototype.copy.call( this, source );

		this.fragmentShader = source.fragmentShader;
		this.vertexShader = source.vertexShader;

		this.uniforms = cloneUniforms( source.uniforms );

		this.defines = Object.assign( {}, source.defines );

		this.wireframe = source.wireframe;
		this.wireframeLinewidth = source.wireframeLinewidth;

		this.lights = source.lights;
		this.clipping = source.clipping;

		this.skinning = source.skinning;

		this.morphTargets = source.morphTargets;
		this.morphNormals = source.morphNormals;

		this.extensions = source.extensions;

		return this;

	};

	ShaderMaterial.prototype.toJSON = function ( meta ) {

		var data = Material.prototype.toJSON.call( this, meta );

		data.uniforms = {};

		for ( var name in this.uniforms ) {

			var uniform = this.uniforms[ name ];
			var 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;

		var extensions = {};

		for ( var key in this.extensions ) {

			if ( this.extensions[ key ] === true ) { extensions[ key ] = true; }

		}

		if ( Object.keys( extensions ).length > 0 ) { data.extensions = extensions; }

		return data;

	};

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author mikael emtinger / http://gomo.se/
	 * @author WestLangley / http://github.com/WestLangley
	*/

	function Camera() {

		Object3D.call( this );

		this.type = 'Camera';

		this.matrixWorldInverse = new Matrix4();

		this.projectionMatrix = new Matrix4();
		this.projectionMatrixInverse = new Matrix4();

	}

	Camera.prototype = Object.assign( Object.create( Object3D.prototype ), {

		constructor: Camera,

		isCamera: true,

		copy: function ( source, recursive ) {

			Object3D.prototype.copy.call( this, source, recursive );

			this.matrixWorldInverse.copy( source.matrixWorldInverse );

			this.projectionMatrix.copy( source.projectionMatrix );
			this.projectionMatrixInverse.copy( source.projectionMatrixInverse );

			return this;

		},

		getWorldDirection: function ( target ) {

			if ( target === undefined ) {

				console.warn( 'THREE.Camera: .getWorldDirection() target is now required' );
				target = new Vector3();

			}

			this.updateMatrixWorld( true );

			var e = this.matrixWorld.elements;

			return target.set( - e[ 8 ], - e[ 9 ], - e[ 10 ] ).normalize();

		},

		updateMatrixWorld: function ( force ) {

			Object3D.prototype.updateMatrixWorld.call( this, force );

			this.matrixWorldInverse.getInverse( this.matrixWorld );

		},

		updateWorldMatrix: function ( updateParents, updateChildren ) {

			Object3D.prototype.updateWorldMatrix.call( this, updateParents, updateChildren );

			this.matrixWorldInverse.getInverse( this.matrixWorld );

		},

		clone: function () {

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

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author greggman / http://games.greggman.com/
	 * @author zz85 / http://www.lab4games.net/zz85/blog
	 * @author tschw
	 */

	function PerspectiveCamera( fov, aspect, near, far ) {

		Camera.call( this );

		this.type = 'PerspectiveCamera';

		this.fov = fov !== undefined ? fov : 50;
		this.zoom = 1;

		this.near = near !== undefined ? near : 0.1;
		this.far = far !== undefined ? far : 2000;
		this.focus = 10;

		this.aspect = aspect !== undefined ? aspect : 1;
		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();

	}

	PerspectiveCamera.prototype = Object.assign( Object.create( Camera.prototype ), {

		constructor: PerspectiveCamera,

		isPerspectiveCamera: true,

		copy: function ( source, recursive ) {

			Camera.prototype.copy.call( this, 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: function ( focalLength ) {

			// see http://www.bobatkins.com/photography/technical/field_of_view.html
			var vExtentSlope = 0.5 * this.getFilmHeight() / focalLength;

			this.fov = MathUtils.RAD2DEG * 2 * Math.atan( vExtentSlope );
			this.updateProjectionMatrix();

		},

		/**
		 * Calculates the focal length from the current .fov and .filmGauge.
		 */
		getFocalLength: function () {

			var vExtentSlope = Math.tan( MathUtils.DEG2RAD * 0.5 * this.fov );

			return 0.5 * this.getFilmHeight() / vExtentSlope;

		},

		getEffectiveFOV: function () {

			return MathUtils.RAD2DEG * 2 * Math.atan(
				Math.tan( MathUtils.DEG2RAD * 0.5 * this.fov ) / this.zoom );

		},

		getFilmWidth: function () {

			// film not completely covered in portrait format (aspect < 1)
			return this.filmGauge * Math.min( this.aspect, 1 );

		},

		getFilmHeight: function () {

			// film not completely covered in landscape format (aspect > 1)
			return this.filmGauge / Math.max( this.aspect, 1 );

		},

		/**
		 * 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
		 *
		 *   var w = 1920;
		 *   var h = 1080;
		 *   var fullWidth = w * 3;
		 *   var 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: function ( 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: function () {

			if ( this.view !== null ) {

				this.view.enabled = false;

			}

			this.updateProjectionMatrix();

		},

		updateProjectionMatrix: function () {

			var near = this.near,
				top = near * Math.tan( MathUtils.DEG2RAD * 0.5 * this.fov ) / this.zoom,
				height = 2 * top,
				width = this.aspect * height,
				left = - 0.5 * width,
				view = this.view;

			if ( this.view !== null && this.view.enabled ) {

				var fullWidth = view.fullWidth,
					fullHeight = view.fullHeight;

				left += view.offsetX * width / fullWidth;
				top -= view.offsetY * height / fullHeight;
				width *= view.width / fullWidth;
				height *= view.height / fullHeight;

			}

			var skew = this.filmOffset;
			if ( skew !== 0 ) { left += near * skew / this.getFilmWidth(); }

			this.projectionMatrix.makePerspective( left, left + width, top, top - height, near, this.far );

			this.projectionMatrixInverse.getInverse( this.projectionMatrix );

		},

		toJSON: function ( meta ) {

			var data = Object3D.prototype.toJSON.call( this, 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;

		}

	} );

	/**
	 * Camera for rendering cube maps
	 *	- renders scene into axis-aligned cube
	 *
	 * @author alteredq / http://alteredqualia.com/
	 */

	var fov = 90, aspect = 1;

	function CubeCamera( near, far, cubeResolution, options ) {

		Object3D.call( this );

		this.type = 'CubeCamera';

		var cameraPX = new PerspectiveCamera( fov, aspect, near, far );
		cameraPX.up.set( 0, - 1, 0 );
		cameraPX.lookAt( new Vector3( 1, 0, 0 ) );
		this.add( cameraPX );

		var cameraNX = new PerspectiveCamera( fov, aspect, near, far );
		cameraNX.up.set( 0, - 1, 0 );
		cameraNX.lookAt( new Vector3( - 1, 0, 0 ) );
		this.add( cameraNX );

		var cameraPY = new PerspectiveCamera( fov, aspect, near, far );
		cameraPY.up.set( 0, 0, 1 );
		cameraPY.lookAt( new Vector3( 0, 1, 0 ) );
		this.add( cameraPY );

		var cameraNY = new PerspectiveCamera( fov, aspect, near, far );
		cameraNY.up.set( 0, 0, - 1 );
		cameraNY.lookAt( new Vector3( 0, - 1, 0 ) );
		this.add( cameraNY );

		var cameraPZ = new PerspectiveCamera( fov, aspect, near, far );
		cameraPZ.up.set( 0, - 1, 0 );
		cameraPZ.lookAt( new Vector3( 0, 0, 1 ) );
		this.add( cameraPZ );

		var cameraNZ = new PerspectiveCamera( fov, aspect, near, far );
		cameraNZ.up.set( 0, - 1, 0 );
		cameraNZ.lookAt( new Vector3( 0, 0, - 1 ) );
		this.add( cameraNZ );

		options = options || { format: RGBFormat, magFilter: LinearFilter, minFilter: LinearFilter };

		this.renderTarget = new WebGLCubeRenderTarget( cubeResolution, options );
		this.renderTarget.texture.name = "CubeCamera";

		this.update = function ( renderer, scene ) {

			if ( this.parent === null ) { this.updateMatrixWorld(); }

			var currentRenderTarget = renderer.getRenderTarget();

			var renderTarget = this.renderTarget;
			var generateMipmaps = renderTarget.texture.generateMipmaps;

			renderTarget.texture.generateMipmaps = false;

			renderer.setRenderTarget( renderTarget, 0 );
			renderer.render( scene, cameraPX );

			renderer.setRenderTarget( renderTarget, 1 );
			renderer.render( scene, cameraNX );

			renderer.setRenderTarget( renderTarget, 2 );
			renderer.render( scene, cameraPY );

			renderer.setRenderTarget( renderTarget, 3 );
			renderer.render( scene, cameraNY );

			renderer.setRenderTarget( renderTarget, 4 );
			renderer.render( scene, cameraPZ );

			renderTarget.texture.generateMipmaps = generateMipmaps;

			renderer.setRenderTarget( renderTarget, 5 );
			renderer.render( scene, cameraNZ );

			renderer.setRenderTarget( currentRenderTarget );

		};

		this.clear = function ( renderer, color, depth, stencil ) {

			var currentRenderTarget = renderer.getRenderTarget();

			var renderTarget = this.renderTarget;

			for ( var i = 0; i < 6; i ++ ) {

				renderer.setRenderTarget( renderTarget, i );

				renderer.clear( color, depth, stencil );

			}

			renderer.setRenderTarget( currentRenderTarget );

		};

	}

	CubeCamera.prototype = Object.create( Object3D.prototype );
	CubeCamera.prototype.constructor = CubeCamera;

	/**
	 * @author alteredq / http://alteredqualia.com
	 * @author WestLangley / http://github.com/WestLangley
	 */

	function WebGLCubeRenderTarget( size, options, dummy ) {

		if ( Number.isInteger( options ) ) {

			console.warn( 'THREE.WebGLCubeRenderTarget: constructor signature is now WebGLCubeRenderTarget( size, options )' );

			options = dummy;

		}

		WebGLRenderTarget.call( this, size, size, options );

	}

	WebGLCubeRenderTarget.prototype = Object.create( WebGLRenderTarget.prototype );
	WebGLCubeRenderTarget.prototype.constructor = WebGLCubeRenderTarget;

	WebGLCubeRenderTarget.prototype.isWebGLCubeRenderTarget = true;

	WebGLCubeRenderTarget.prototype.fromEquirectangularTexture = function ( renderer, texture ) {

		this.texture.type = texture.type;
		this.texture.format = texture.format;
		this.texture.encoding = texture.encoding;

		var scene = new Scene();

		var shader = {

			uniforms: {
				tEquirect: { value: null },
			},

			vertexShader: [

				"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>",

				"}"

			].join( '\n' ),

			fragmentShader: [

				"uniform sampler2D tEquirect;",

				"varying vec3 vWorldDirection;",

				"#define RECIPROCAL_PI 0.31830988618",
				"#define RECIPROCAL_PI2 0.15915494",

				"void main() {",

				"	vec3 direction = normalize( vWorldDirection );",

				"	vec2 sampleUV;",

				"	sampleUV.y = asin( clamp( direction.y, - 1.0, 1.0 ) ) * RECIPROCAL_PI + 0.5;",

				"	sampleUV.x = atan( direction.z, direction.x ) * RECIPROCAL_PI2 + 0.5;",

				"	gl_FragColor = texture2D( tEquirect, sampleUV );",

				"}"

			].join( '\n' ),
		};

		var material = new ShaderMaterial( {

			type: 'CubemapFromEquirect',

			uniforms: cloneUniforms( shader.uniforms ),
			vertexShader: shader.vertexShader,
			fragmentShader: shader.fragmentShader,
			side: BackSide,
			blending: NoBlending

		} );

		material.uniforms.tEquirect.value = texture;

		var mesh = new Mesh( new BoxBufferGeometry( 5, 5, 5 ), material );

		scene.add( mesh );

		var camera = new CubeCamera( 1, 10, 1 );

		camera.renderTarget = this;
		camera.renderTarget.texture.name = 'CubeCameraTexture';

		camera.update( renderer, scene );

		mesh.geometry.dispose();
		mesh.material.dispose();

		return this;

	};

	/**
	 * @author alteredq / http://alteredqualia.com/
	 */

	function DataTexture( data, width, height, format, type, mapping, wrapS, wrapT, magFilter, minFilter, anisotropy, encoding ) {

		Texture.call( this, null, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy, encoding );

		this.image = { data: data || null, width: width || 1, height: height || 1 };

		this.magFilter = magFilter !== undefined ? magFilter : NearestFilter;
		this.minFilter = minFilter !== undefined ? minFilter : NearestFilter;

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

		this.needsUpdate = true;

	}

	DataTexture.prototype = Object.create( Texture.prototype );
	DataTexture.prototype.constructor = DataTexture;

	DataTexture.prototype.isDataTexture = true;

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author alteredq / http://alteredqualia.com/
	 * @author bhouston / http://clara.io
	 */

	var _sphere$1 = new Sphere();
	var _vector$5 = new Vector3();

	function Frustum( p0, p1, p2, p3, p4, p5 ) {

		this.planes = [

			( p0 !== undefined ) ? p0 : new Plane(),
			( p1 !== undefined ) ? p1 : new Plane(),
			( p2 !== undefined ) ? p2 : new Plane(),
			( p3 !== undefined ) ? p3 : new Plane(),
			( p4 !== undefined ) ? p4 : new Plane(),
			( p5 !== undefined ) ? p5 : new Plane()

		];

	}

	Object.assign( Frustum.prototype, {

		set: function ( p0, p1, p2, p3, p4, p5 ) {

			var 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;

		},

		clone: function () {

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

		},

		copy: function ( frustum ) {

			var planes = this.planes;

			for ( var i = 0; i < 6; i ++ ) {

				planes[ i ].copy( frustum.planes[ i ] );

			}

			return this;

		},

		setFromProjectionMatrix: function ( m ) {

			var planes = this.planes;
			var me = m.elements;
			var me0 = me[ 0 ], me1 = me[ 1 ], me2 = me[ 2 ], me3 = me[ 3 ];
			var me4 = me[ 4 ], me5 = me[ 5 ], me6 = me[ 6 ], me7 = me[ 7 ];
			var me8 = me[ 8 ], me9 = me[ 9 ], me10 = me[ 10 ], me11 = me[ 11 ];
			var 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();
			planes[ 5 ].setComponents( me3 + me2, me7 + me6, me11 + me10, me15 + me14 ).normalize();

			return this;

		},

		intersectsObject: function ( object ) {

			var geometry = object.geometry;

			if ( geometry.boundingSphere === null ) { geometry.computeBoundingSphere(); }

			_sphere$1.copy( geometry.boundingSphere ).applyMatrix4( object.matrixWorld );

			return this.intersectsSphere( _sphere$1 );

		},

		intersectsSprite: function ( sprite ) {

			_sphere$1.center.set( 0, 0, 0 );
			_sphere$1.radius = 0.7071067811865476;
			_sphere$1.applyMatrix4( sprite.matrixWorld );

			return this.intersectsSphere( _sphere$1 );

		},

		intersectsSphere: function ( sphere ) {

			var planes = this.planes;
			var center = sphere.center;
			var negRadius = - sphere.radius;

			for ( var i = 0; i < 6; i ++ ) {

				var distance = planes[ i ].distanceToPoint( center );

				if ( distance < negRadius ) {

					return false;

				}

			}

			return true;

		},

		intersectsBox: function ( box ) {

			var planes = this.planes;

			for ( var i = 0; i < 6; i ++ ) {

				var plane = planes[ i ];

				// corner at max distance

				_vector$5.x = plane.normal.x > 0 ? box.max.x : box.min.x;
				_vector$5.y = plane.normal.y > 0 ? box.max.y : box.min.y;
				_vector$5.z = plane.normal.z > 0 ? box.max.z : box.min.z;

				if ( plane.distanceToPoint( _vector$5 ) < 0 ) {

					return false;

				}

			}

			return true;

		},

		containsPoint: function ( point ) {

			var planes = this.planes;

			for ( var i = 0; i < 6; i ++ ) {

				if ( planes[ i ].distanceToPoint( point ) < 0 ) {

					return false;

				}

			}

			return true;

		}

	} );

	/**
	 * Uniforms library for shared webgl shaders
	 */

	var UniformsLib = {

		common: {

			diffuse: { value: new Color( 0xeeeeee ) },
			opacity: { value: 1.0 },

			map: { value: null },
			uvTransform: { value: new Matrix3() },
			uv2Transform: { value: new Matrix3() },

			alphaMap: { value: null },

		},

		specularmap: {

			specularMap: { value: null },

		},

		envmap: {

			envMap: { value: null },
			flipEnvMap: { value: - 1 },
			reflectivity: { value: 1.0 },
			refractionRatio: { value: 0.98 },
			maxMipLevel: { value: 0 }

		},

		aomap: {

			aoMap: { value: null },
			aoMapIntensity: { value: 1 }

		},

		lightmap: {

			lightMap: { value: null },
			lightMapIntensity: { value: 1 }

		},

		emissivemap: {

			emissiveMap: { value: null }

		},

		bumpmap: {

			bumpMap: { value: null },
			bumpScale: { value: 1 }

		},

		normalmap: {

			normalMap: { value: null },
			normalScale: { value: new Vector2( 1, 1 ) }

		},

		displacementmap: {

			displacementMap: { value: null },
			displacementScale: { value: 1 },
			displacementBias: { value: 0 }

		},

		roughnessmap: {

			roughnessMap: { value: null }

		},

		metalnessmap: {

			metalnessMap: { value: null }

		},

		gradientmap: {

			gradientMap: { value: null }

		},

		fog: {

			fogDensity: { value: 0.00025 },
			fogNear: { value: 1 },
			fogFar: { value: 2000 },
			fogColor: { value: new Color( 0xffffff ) }

		},

		lights: {

			ambientLightColor: { value: [] },

			lightProbe: { value: [] },

			directionalLights: { value: [], properties: {
				direction: {},
				color: {}
			} },

			directionalLightShadows: { value: [], properties: {
				shadowBias: {},
				shadowRadius: {},
				shadowMapSize: {}
			} },

			directionalShadowMap: { value: [] },
			directionalShadowMatrix: { value: [] },

			spotLights: { value: [], properties: {
				color: {},
				position: {},
				direction: {},
				distance: {},
				coneCos: {},
				penumbraCos: {},
				decay: {}
			} },

			spotLightShadows: { value: [], properties: {
				shadowBias: {},
				shadowRadius: {},
				shadowMapSize: {}
			} },

			spotShadowMap: { value: [] },
			spotShadowMatrix: { value: [] },

			pointLights: { value: [], properties: {
				color: {},
				position: {},
				decay: {},
				distance: {}
			} },

			pointLightShadows: { value: [], properties: {
				shadowBias: {},
				shadowRadius: {},
				shadowMapSize: {},
				shadowCameraNear: {},
				shadowCameraFar: {}
			} },

			pointShadowMap: { value: [] },
			pointShadowMatrix: { value: [] },

			hemisphereLights: { value: [], properties: {
				direction: {},
				skyColor: {},
				groundColor: {}
			} },

			// TODO (abelnation): RectAreaLight BRDF data needs to be moved from example to main src
			rectAreaLights: { value: [], properties: {
				color: {},
				position: {},
				width: {},
				height: {}
			} }

		},

		points: {

			diffuse: { value: new Color( 0xeeeeee ) },
			opacity: { value: 1.0 },
			size: { value: 1.0 },
			scale: { value: 1.0 },
			map: { value: null },
			alphaMap: { value: null },
			uvTransform: { value: new Matrix3() }

		},

		sprite: {

			diffuse: { value: new Color( 0xeeeeee ) },
			opacity: { value: 1.0 },
			center: { value: new Vector2( 0.5, 0.5 ) },
			rotation: { value: 0.0 },
			map: { value: null },
			alphaMap: { value: null },
			uvTransform: { value: new Matrix3() }

		}

	};

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function WebGLAnimation() {

		var context = null;
		var isAnimating = false;
		var animationLoop = null;

		function onAnimationFrame( time, frame ) {

			if ( isAnimating === false ) { return; }

			animationLoop( time, frame );

			context.requestAnimationFrame( onAnimationFrame );

		}

		return {

			start: function () {

				if ( isAnimating === true ) { return; }
				if ( animationLoop === null ) { return; }

				context.requestAnimationFrame( onAnimationFrame );

				isAnimating = true;

			},

			stop: function () {

				isAnimating = false;

			},

			setAnimationLoop: function ( callback ) {

				animationLoop = callback;

			},

			setContext: function ( value ) {

				context = value;

			}

		};

	}

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function WebGLAttributes( gl, capabilities ) {

		var isWebGL2 = capabilities.isWebGL2;

		var buffers = new WeakMap();

		function createBuffer( attribute, bufferType ) {

			var array = attribute.array;
			var usage = attribute.usage;

			var buffer = gl.createBuffer();

			gl.bindBuffer( bufferType, buffer );
			gl.bufferData( bufferType, array, usage );

			attribute.onUploadCallback();

			var type = 5126;

			if ( array instanceof Float32Array ) {

				type = 5126;

			} else if ( array instanceof Float64Array ) {

				console.warn( 'THREE.WebGLAttributes: Unsupported data buffer format: Float64Array.' );

			} else if ( array instanceof Uint16Array ) {

				type = 5123;

			} else if ( array instanceof Int16Array ) {

				type = 5122;

			} else if ( array instanceof Uint32Array ) {

				type = 5125;

			} else if ( array instanceof Int32Array ) {

				type = 5124;

			} else if ( array instanceof Int8Array ) {

				type = 5120;

			} else if ( array instanceof Uint8Array ) {

				type = 5121;

			}

			return {
				buffer: buffer,
				type: type,
				bytesPerElement: array.BYTES_PER_ELEMENT,
				version: attribute.version
			};

		}

		function updateBuffer( buffer, attribute, bufferType ) {

			var array = attribute.array;
			var updateRange = attribute.updateRange;

			gl.bindBuffer( bufferType, buffer );

			if ( updateRange.count === - 1 ) {

				// Not using update ranges

				gl.bufferSubData( bufferType, 0, array );

			} else {

				if ( isWebGL2 ) {

					gl.bufferSubData( bufferType, updateRange.offset * array.BYTES_PER_ELEMENT,
						array, updateRange.offset, updateRange.count );

				} else {

					gl.bufferSubData( bufferType, updateRange.offset * array.BYTES_PER_ELEMENT,
						array.subarray( updateRange.offset, updateRange.offset + updateRange.count ) );

				}

				updateRange.count = - 1; // reset range

			}

		}

		//

		function get( attribute ) {

			if ( attribute.isInterleavedBufferAttribute ) { attribute = attribute.data; }

			return buffers.get( attribute );

		}

		function remove( attribute ) {

			if ( attribute.isInterleavedBufferAttribute ) { attribute = attribute.data; }

			var data = buffers.get( attribute );

			if ( data ) {

				gl.deleteBuffer( data.buffer );

				buffers.delete( attribute );

			}

		}

		function update( attribute, bufferType ) {

			if ( attribute.isInterleavedBufferAttribute ) { attribute = attribute.data; }

			var data = buffers.get( attribute );

			if ( data === undefined ) {

				buffers.set( attribute, createBuffer( attribute, bufferType ) );

			} else if ( data.version < attribute.version ) {

				updateBuffer( data.buffer, attribute, bufferType );

				data.version = attribute.version;

			}

		}

		return {

			get: get,
			remove: remove,
			update: update

		};

	}

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author Mugen87 / https://github.com/Mugen87
	 */

	// PlaneGeometry

	function PlaneGeometry( width, height, widthSegments, heightSegments ) {

		Geometry.call( this );

		this.type = 'PlaneGeometry';

		this.parameters = {
			width: width,
			height: height,
			widthSegments: widthSegments,
			heightSegments: heightSegments
		};

		this.fromBufferGeometry( new PlaneBufferGeometry( width, height, widthSegments, heightSegments ) );
		this.mergeVertices();

	}

	PlaneGeometry.prototype = Object.create( Geometry.prototype );
	PlaneGeometry.prototype.constructor = PlaneGeometry;

	// PlaneBufferGeometry

	function PlaneBufferGeometry( width, height, widthSegments, heightSegments ) {

		BufferGeometry.call( this );

		this.type = 'PlaneBufferGeometry';

		this.parameters = {
			width: width,
			height: height,
			widthSegments: widthSegments,
			heightSegments: heightSegments
		};

		width = width || 1;
		height = height || 1;

		var width_half = width / 2;
		var height_half = height / 2;

		var gridX = Math.floor( widthSegments ) || 1;
		var gridY = Math.floor( heightSegments ) || 1;

		var gridX1 = gridX + 1;
		var gridY1 = gridY + 1;

		var segment_width = width / gridX;
		var segment_height = height / gridY;

		var ix, iy;

		// buffers

		var indices = [];
		var vertices = [];
		var normals = [];
		var uvs = [];

		// generate vertices, normals and uvs

		for ( iy = 0; iy < gridY1; iy ++ ) {

			var y = iy * segment_height - height_half;

			for ( ix = 0; ix < gridX1; ix ++ ) {

				var 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 ) );

			}

		}

		// indices

		for ( iy = 0; iy < gridY; iy ++ ) {

			for ( ix = 0; ix < gridX; ix ++ ) {

				var a = ix + gridX1 * iy;
				var b = ix + gridX1 * ( iy + 1 );
				var c = ( ix + 1 ) + gridX1 * ( iy + 1 );
				var d = ( ix + 1 ) + gridX1 * iy;

				// 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 ) );

	}

	PlaneBufferGeometry.prototype = Object.create( BufferGeometry.prototype );
	PlaneBufferGeometry.prototype.constructor = PlaneBufferGeometry;

	var alphamap_fragment = "#ifdef USE_ALPHAMAP\n\tdiffuseColor.a *= texture2D( alphaMap, vUv ).g;\n#endif";

	var alphamap_pars_fragment = "#ifdef USE_ALPHAMAP\n\tuniform sampler2D alphaMap;\n#endif";

	var alphatest_fragment = "#ifdef ALPHATEST\n\tif ( diffuseColor.a < ALPHATEST ) discard;\n#endif";

	var aomap_fragment = "#ifdef USE_AOMAP\n\tfloat ambientOcclusion = ( texture2D( aoMap, vUv2 ).r - 1.0 ) * aoMapIntensity + 1.0;\n\treflectedLight.indirectDiffuse *= ambientOcclusion;\n\t#if defined( USE_ENVMAP ) && defined( STANDARD )\n\t\tfloat dotNV = saturate( dot( geometry.normal, geometry.viewDir ) );\n\t\treflectedLight.indirectSpecular *= computeSpecularOcclusion( dotNV, ambientOcclusion, material.specularRoughness );\n\t#endif\n#endif";

	var aomap_pars_fragment = "#ifdef USE_AOMAP\n\tuniform sampler2D aoMap;\n\tuniform float aoMapIntensity;\n#endif";

	var begin_vertex = "vec3 transformed = vec3( position );";

	var beginnormal_vertex = "vec3 objectNormal = vec3( normal );\n#ifdef USE_TANGENT\n\tvec3 objectTangent = vec3( tangent.xyz );\n#endif";

	var bsdfs = "vec2 integrateSpecularBRDF( const in float dotNV, const in float roughness ) {\n\tconst vec4 c0 = vec4( - 1, - 0.0275, - 0.572, 0.022 );\n\tconst vec4 c1 = vec4( 1, 0.0425, 1.04, - 0.04 );\n\tvec4 r = roughness * c0 + c1;\n\tfloat a004 = min( r.x * r.x, exp2( - 9.28 * dotNV ) ) * r.x + r.y;\n\treturn vec2( -1.04, 1.04 ) * a004 + r.zw;\n}\nfloat punctualLightIntensityToIrradianceFactor( const in float lightDistance, const in float cutoffDistance, const in float decayExponent ) {\n#if defined ( PHYSICALLY_CORRECT_LIGHTS )\n\tfloat distanceFalloff = 1.0 / max( pow( lightDistance, decayExponent ), 0.01 );\n\tif( cutoffDistance > 0.0 ) {\n\t\tdistanceFalloff *= pow2( saturate( 1.0 - pow4( lightDistance / cutoffDistance ) ) );\n\t}\n\treturn distanceFalloff;\n#else\n\tif( cutoffDistance > 0.0 && decayExponent > 0.0 ) {\n\t\treturn pow( saturate( -lightDistance / cutoffDistance + 1.0 ), decayExponent );\n\t}\n\treturn 1.0;\n#endif\n}\nvec3 BRDF_Diffuse_Lambert( const in vec3 diffuseColor ) {\n\treturn RECIPROCAL_PI * diffuseColor;\n}\nvec3 F_Schlick( const in vec3 specularColor, const in float dotLH ) {\n\tfloat fresnel = exp2( ( -5.55473 * dotLH - 6.98316 ) * dotLH );\n\treturn ( 1.0 - specularColor ) * fresnel + specularColor;\n}\nvec3 F_Schlick_RoughnessDependent( const in vec3 F0, const in float dotNV, const in float roughness ) {\n\tfloat fresnel = exp2( ( -5.55473 * dotNV - 6.98316 ) * dotNV );\n\tvec3 Fr = max( vec3( 1.0 - roughness ), F0 ) - F0;\n\treturn Fr * fresnel + F0;\n}\nfloat G_GGX_Smith( const in float alpha, const in float dotNL, const in float dotNV ) {\n\tfloat a2 = pow2( alpha );\n\tfloat gl = dotNL + sqrt( a2 + ( 1.0 - a2 ) * pow2( dotNL ) );\n\tfloat gv = dotNV + sqrt( a2 + ( 1.0 - a2 ) * pow2( dotNV ) );\n\treturn 1.0 / ( gl * gv );\n}\nfloat G_GGX_SmithCorrelated( const in float alpha, const in float dotNL, const in float dotNV ) {\n\tfloat a2 = pow2( alpha );\n\tfloat gv = dotNL * sqrt( a2 + ( 1.0 - a2 ) * pow2( dotNV ) );\n\tfloat gl = dotNV * sqrt( a2 + ( 1.0 - a2 ) * pow2( dotNL ) );\n\treturn 0.5 / max( gv + gl, EPSILON );\n}\nfloat D_GGX( const in float alpha, const in float dotNH ) {\n\tfloat a2 = pow2( alpha );\n\tfloat denom = pow2( dotNH ) * ( a2 - 1.0 ) + 1.0;\n\treturn RECIPROCAL_PI * a2 / pow2( denom );\n}\nvec3 BRDF_Specular_GGX( const in IncidentLight incidentLight, const in vec3 viewDir, const in vec3 normal, const in vec3 specularColor, const in float roughness ) {\n\tfloat alpha = pow2( roughness );\n\tvec3 halfDir = normalize( incidentLight.direction + viewDir );\n\tfloat dotNL = saturate( dot( normal, incidentLight.direction ) );\n\tfloat dotNV = saturate( dot( normal, viewDir ) );\n\tfloat dotNH = saturate( dot( normal, halfDir ) );\n\tfloat dotLH = saturate( dot( incidentLight.direction, halfDir ) );\n\tvec3 F = F_Schlick( specularColor, dotLH );\n\tfloat G = G_GGX_SmithCorrelated( alpha, dotNL, dotNV );\n\tfloat D = D_GGX( alpha, dotNH );\n\treturn F * ( G * D );\n}\nvec2 LTC_Uv( const in vec3 N, const in vec3 V, const in float roughness ) {\n\tconst float LUT_SIZE  = 64.0;\n\tconst float LUT_SCALE = ( LUT_SIZE - 1.0 ) / LUT_SIZE;\n\tconst float LUT_BIAS  = 0.5 / LUT_SIZE;\n\tfloat dotNV = saturate( dot( N, V ) );\n\tvec2 uv = vec2( roughness, sqrt( 1.0 - dotNV ) );\n\tuv = uv * LUT_SCALE + LUT_BIAS;\n\treturn uv;\n}\nfloat LTC_ClippedSphereFormFactor( const in vec3 f ) {\n\tfloat l = length( f );\n\treturn max( ( l * l + f.z ) / ( l + 1.0 ), 0.0 );\n}\nvec3 LTC_EdgeVectorFormFactor( const in vec3 v1, const in vec3 v2 ) {\n\tfloat x = dot( v1, v2 );\n\tfloat y = abs( x );\n\tfloat a = 0.8543985 + ( 0.4965155 + 0.0145206 * y ) * y;\n\tfloat b = 3.4175940 + ( 4.1616724 + y ) * y;\n\tfloat v = a / b;\n\tfloat theta_sintheta = ( x > 0.0 ) ? v : 0.5 * inversesqrt( max( 1.0 - x * x, 1e-7 ) ) - v;\n\treturn cross( v1, v2 ) * theta_sintheta;\n}\nvec3 LTC_Evaluate( const in vec3 N, const in vec3 V, const in vec3 P, const in mat3 mInv, const in vec3 rectCoords[ 4 ] ) {\n\tvec3 v1 = rectCoords[ 1 ] - rectCoords[ 0 ];\n\tvec3 v2 = rectCoords[ 3 ] - rectCoords[ 0 ];\n\tvec3 lightNormal = cross( v1, v2 );\n\tif( dot( lightNormal, P - rectCoords[ 0 ] ) < 0.0 ) return vec3( 0.0 );\n\tvec3 T1, T2;\n\tT1 = normalize( V - N * dot( V, N ) );\n\tT2 = - cross( N, T1 );\n\tmat3 mat = mInv * transposeMat3( mat3( T1, T2, N ) );\n\tvec3 coords[ 4 ];\n\tcoords[ 0 ] = mat * ( rectCoords[ 0 ] - P );\n\tcoords[ 1 ] = mat * ( rectCoords[ 1 ] - P );\n\tcoords[ 2 ] = mat * ( rectCoords[ 2 ] - P );\n\tcoords[ 3 ] = mat * ( rectCoords[ 3 ] - P );\n\tcoords[ 0 ] = normalize( coords[ 0 ] );\n\tcoords[ 1 ] = normalize( coords[ 1 ] );\n\tcoords[ 2 ] = normalize( coords[ 2 ] );\n\tcoords[ 3 ] = normalize( coords[ 3 ] );\n\tvec3 vectorFormFactor = vec3( 0.0 );\n\tvectorFormFactor += LTC_EdgeVectorFormFactor( coords[ 0 ], coords[ 1 ] );\n\tvectorFormFactor += LTC_EdgeVectorFormFactor( coords[ 1 ], coords[ 2 ] );\n\tvectorFormFactor += LTC_EdgeVectorFormFactor( coords[ 2 ], coords[ 3 ] );\n\tvectorFormFactor += LTC_EdgeVectorFormFactor( coords[ 3 ], coords[ 0 ] );\n\tfloat result = LTC_ClippedSphereFormFactor( vectorFormFactor );\n\treturn vec3( result );\n}\nvec3 BRDF_Specular_GGX_Environment( const in vec3 viewDir, const in vec3 normal, const in vec3 specularColor, const in float roughness ) {\n\tfloat dotNV = saturate( dot( normal, viewDir ) );\n\tvec2 brdf = integrateSpecularBRDF( dotNV, roughness );\n\treturn specularColor * brdf.x + brdf.y;\n}\nvoid BRDF_Specular_Multiscattering_Environment( const in GeometricContext geometry, const in vec3 specularColor, const in float roughness, inout vec3 singleScatter, inout vec3 multiScatter ) {\n\tfloat dotNV = saturate( dot( geometry.normal, geometry.viewDir ) );\n\tvec3 F = F_Schlick_RoughnessDependent( specularColor, dotNV, roughness );\n\tvec2 brdf = integrateSpecularBRDF( dotNV, roughness );\n\tvec3 FssEss = F * brdf.x + brdf.y;\n\tfloat Ess = brdf.x + brdf.y;\n\tfloat Ems = 1.0 - Ess;\n\tvec3 Favg = specularColor + ( 1.0 - specularColor ) * 0.047619;\tvec3 Fms = FssEss * Favg / ( 1.0 - Ems * Favg );\n\tsingleScatter += FssEss;\n\tmultiScatter += Fms * Ems;\n}\nfloat G_BlinnPhong_Implicit( ) {\n\treturn 0.25;\n}\nfloat D_BlinnPhong( const in float shininess, const in float dotNH ) {\n\treturn RECIPROCAL_PI * ( shininess * 0.5 + 1.0 ) * pow( dotNH, shininess );\n}\nvec3 BRDF_Specular_BlinnPhong( const in IncidentLight incidentLight, const in GeometricContext geometry, const in vec3 specularColor, const in float shininess ) {\n\tvec3 halfDir = normalize( incidentLight.direction + geometry.viewDir );\n\tfloat dotNH = saturate( dot( geometry.normal, halfDir ) );\n\tfloat dotLH = saturate( dot( incidentLight.direction, halfDir ) );\n\tvec3 F = F_Schlick( specularColor, dotLH );\n\tfloat G = G_BlinnPhong_Implicit( );\n\tfloat D = D_BlinnPhong( shininess, dotNH );\n\treturn F * ( G * D );\n}\nfloat GGXRoughnessToBlinnExponent( const in float ggxRoughness ) {\n\treturn ( 2.0 / pow2( ggxRoughness + 0.0001 ) - 2.0 );\n}\nfloat BlinnExponentToGGXRoughness( const in float blinnExponent ) {\n\treturn sqrt( 2.0 / ( blinnExponent + 2.0 ) );\n}\n#if defined( USE_SHEEN )\nfloat D_Charlie(float roughness, float NoH) {\n\tfloat invAlpha  = 1.0 / roughness;\n\tfloat cos2h = NoH * NoH;\n\tfloat sin2h = max(1.0 - cos2h, 0.0078125);\treturn (2.0 + invAlpha) * pow(sin2h, invAlpha * 0.5) / (2.0 * PI);\n}\nfloat V_Neubelt(float NoV, float NoL) {\n\treturn saturate(1.0 / (4.0 * (NoL + NoV - NoL * NoV)));\n}\nvec3 BRDF_Specular_Sheen( const in float roughness, const in vec3 L, const in GeometricContext geometry, vec3 specularColor ) {\n\tvec3 N = geometry.normal;\n\tvec3 V = geometry.viewDir;\n\tvec3 H = normalize( V + L );\n\tfloat dotNH = saturate( dot( N, H ) );\n\treturn specularColor * D_Charlie( roughness, dotNH ) * V_Neubelt( dot(N, V), dot(N, L) );\n}\n#endif";

	var bumpmap_pars_fragment = "#ifdef USE_BUMPMAP\n\tuniform sampler2D bumpMap;\n\tuniform float bumpScale;\n\tvec2 dHdxy_fwd() {\n\t\tvec2 dSTdx = dFdx( vUv );\n\t\tvec2 dSTdy = dFdy( vUv );\n\t\tfloat Hll = bumpScale * texture2D( bumpMap, vUv ).x;\n\t\tfloat dBx = bumpScale * texture2D( bumpMap, vUv + dSTdx ).x - Hll;\n\t\tfloat dBy = bumpScale * texture2D( bumpMap, vUv + dSTdy ).x - Hll;\n\t\treturn vec2( dBx, dBy );\n\t}\n\tvec3 perturbNormalArb( vec3 surf_pos, vec3 surf_norm, vec2 dHdxy ) {\n\t\tvec3 vSigmaX = vec3( dFdx( surf_pos.x ), dFdx( surf_pos.y ), dFdx( surf_pos.z ) );\n\t\tvec3 vSigmaY = vec3( dFdy( surf_pos.x ), dFdy( surf_pos.y ), dFdy( surf_pos.z ) );\n\t\tvec3 vN = surf_norm;\n\t\tvec3 R1 = cross( vSigmaY, vN );\n\t\tvec3 R2 = cross( vN, vSigmaX );\n\t\tfloat fDet = dot( vSigmaX, R1 );\n\t\tfDet *= ( float( gl_FrontFacing ) * 2.0 - 1.0 );\n\t\tvec3 vGrad = sign( fDet ) * ( dHdxy.x * R1 + dHdxy.y * R2 );\n\t\treturn normalize( abs( fDet ) * surf_norm - vGrad );\n\t}\n#endif";

	var clipping_planes_fragment = "#if NUM_CLIPPING_PLANES > 0\n\tvec4 plane;\n\t#pragma unroll_loop\n\tfor ( int i = 0; i < UNION_CLIPPING_PLANES; i ++ ) {\n\t\tplane = clippingPlanes[ i ];\n\t\tif ( dot( vViewPosition, plane.xyz ) > plane.w ) discard;\n\t}\n\t#if UNION_CLIPPING_PLANES < NUM_CLIPPING_PLANES\n\t\tbool clipped = true;\n\t\t#pragma unroll_loop\n\t\tfor ( int i = UNION_CLIPPING_PLANES; i < NUM_CLIPPING_PLANES; i ++ ) {\n\t\t\tplane = clippingPlanes[ i ];\n\t\t\tclipped = ( dot( vViewPosition, plane.xyz ) > plane.w ) && clipped;\n\t\t}\n\t\tif ( clipped ) discard;\n\t#endif\n#endif";

	var clipping_planes_pars_fragment = "#if NUM_CLIPPING_PLANES > 0\n\t#if ! defined( STANDARD ) && ! defined( PHONG ) && ! defined( MATCAP ) && ! defined( TOON )\n\t\tvarying vec3 vViewPosition;\n\t#endif\n\tuniform vec4 clippingPlanes[ NUM_CLIPPING_PLANES ];\n#endif";

	var clipping_planes_pars_vertex = "#if NUM_CLIPPING_PLANES > 0 && ! defined( STANDARD ) && ! defined( PHONG ) && ! defined( MATCAP ) && ! defined( TOON )\n\tvarying vec3 vViewPosition;\n#endif";

	var clipping_planes_vertex = "#if NUM_CLIPPING_PLANES > 0 && ! defined( STANDARD ) && ! defined( PHONG ) && ! defined( MATCAP ) && ! defined( TOON )\n\tvViewPosition = - mvPosition.xyz;\n#endif";

	var color_fragment = "#ifdef USE_COLOR\n\tdiffuseColor.rgb *= vColor;\n#endif";

	var color_pars_fragment = "#ifdef USE_COLOR\n\tvarying vec3 vColor;\n#endif";

	var color_pars_vertex = "#ifdef USE_COLOR\n\tvarying vec3 vColor;\n#endif";

	var color_vertex = "#ifdef USE_COLOR\n\tvColor.xyz = color.xyz;\n#endif";

	var common = "#define PI 3.14159265359\n#define PI2 6.28318530718\n#define PI_HALF 1.5707963267949\n#define RECIPROCAL_PI 0.31830988618\n#define RECIPROCAL_PI2 0.15915494\n#define LOG2 1.442695\n#define EPSILON 1e-6\n#ifndef saturate\n#define saturate(a) clamp( a, 0.0, 1.0 )\n#endif\n#define whiteComplement(a) ( 1.0 - saturate( a ) )\nfloat pow2( const in float x ) { return x*x; }\nfloat pow3( const in float x ) { return x*x*x; }\nfloat pow4( const in float x ) { float x2 = x*x; return x2*x2; }\nfloat average( const in vec3 color ) { return dot( color, vec3( 0.3333 ) ); }\nhighp float rand( const in vec2 uv ) {\n\tconst highp float a = 12.9898, b = 78.233, c = 43758.5453;\n\thighp float dt = dot( uv.xy, vec2( a,b ) ), sn = mod( dt, PI );\n\treturn fract(sin(sn) * c);\n}\n#ifdef HIGH_PRECISION\n\tfloat precisionSafeLength( vec3 v ) { return length( v ); }\n#else\n\tfloat max3( vec3 v ) { return max( max( v.x, v.y ), v.z ); }\n\tfloat precisionSafeLength( vec3 v ) {\n\t\tfloat maxComponent = max3( abs( v ) );\n\t\treturn length( v / maxComponent ) * maxComponent;\n\t}\n#endif\nstruct IncidentLight {\n\tvec3 color;\n\tvec3 direction;\n\tbool visible;\n};\nstruct ReflectedLight {\n\tvec3 directDiffuse;\n\tvec3 directSpecular;\n\tvec3 indirectDiffuse;\n\tvec3 indirectSpecular;\n};\nstruct GeometricContext {\n\tvec3 position;\n\tvec3 normal;\n\tvec3 viewDir;\n#ifdef CLEARCOAT\n\tvec3 clearcoatNormal;\n#endif\n};\nvec3 transformDirection( in vec3 dir, in mat4 matrix ) {\n\treturn normalize( ( matrix * vec4( dir, 0.0 ) ).xyz );\n}\nvec3 inverseTransformDirection( in vec3 dir, in mat4 matrix ) {\n\treturn normalize( ( vec4( dir, 0.0 ) * matrix ).xyz );\n}\nvec3 projectOnPlane(in vec3 point, in vec3 pointOnPlane, in vec3 planeNormal ) {\n\tfloat distance = dot( planeNormal, point - pointOnPlane );\n\treturn - distance * planeNormal + point;\n}\nfloat sideOfPlane( in vec3 point, in vec3 pointOnPlane, in vec3 planeNormal ) {\n\treturn sign( dot( point - pointOnPlane, planeNormal ) );\n}\nvec3 linePlaneIntersect( in vec3 pointOnLine, in vec3 lineDirection, in vec3 pointOnPlane, in vec3 planeNormal ) {\n\treturn lineDirection * ( dot( planeNormal, pointOnPlane - pointOnLine ) / dot( planeNormal, lineDirection ) ) + pointOnLine;\n}\nmat3 transposeMat3( const in mat3 m ) {\n\tmat3 tmp;\n\ttmp[ 0 ] = vec3( m[ 0 ].x, m[ 1 ].x, m[ 2 ].x );\n\ttmp[ 1 ] = vec3( m[ 0 ].y, m[ 1 ].y, m[ 2 ].y );\n\ttmp[ 2 ] = vec3( m[ 0 ].z, m[ 1 ].z, m[ 2 ].z );\n\treturn tmp;\n}\nfloat linearToRelativeLuminance( const in vec3 color ) {\n\tvec3 weights = vec3( 0.2126, 0.7152, 0.0722 );\n\treturn dot( weights, color.rgb );\n}\nbool isPerspectiveMatrix( mat4 m ) {\n  return m[ 2 ][ 3 ] == - 1.0;\n}";

	var cube_uv_reflection_fragment = "#ifdef ENVMAP_TYPE_CUBE_UV\n#define cubeUV_maxMipLevel 8.0\n#define cubeUV_minMipLevel 4.0\n#define cubeUV_maxTileSize 256.0\n#define cubeUV_minTileSize 16.0\nfloat getFace(vec3 direction) {\n    vec3 absDirection = abs(direction);\n    float face = -1.0;\n    if (absDirection.x > absDirection.z) {\n      if (absDirection.x > absDirection.y)\n        face = direction.x > 0.0 ? 0.0 : 3.0;\n      else\n        face = direction.y > 0.0 ? 1.0 : 4.0;\n    } else {\n      if (absDirection.z > absDirection.y)\n        face = direction.z > 0.0 ? 2.0 : 5.0;\n      else\n        face = direction.y > 0.0 ? 1.0 : 4.0;\n    }\n    return face;\n}\nvec2 getUV(vec3 direction, float face) {\n    vec2 uv;\n    if (face == 0.0) {\n      uv = vec2(-direction.z, direction.y) / abs(direction.x);\n    } else if (face == 1.0) {\n      uv = vec2(direction.x, -direction.z) / abs(direction.y);\n    } else if (face == 2.0) {\n      uv = direction.xy / abs(direction.z);\n    } else if (face == 3.0) {\n      uv = vec2(direction.z, direction.y) / abs(direction.x);\n    } else if (face == 4.0) {\n      uv = direction.xz / abs(direction.y);\n    } else {\n      uv = vec2(-direction.x, direction.y) / abs(direction.z);\n    }\n    return 0.5 * (uv + 1.0);\n}\nvec3 bilinearCubeUV(sampler2D envMap, vec3 direction, float mipInt) {\n  float face = getFace(direction);\n  float filterInt = max(cubeUV_minMipLevel - mipInt, 0.0);\n  mipInt = max(mipInt, cubeUV_minMipLevel);\n  float faceSize = exp2(mipInt);\n  float texelSize = 1.0 / (3.0 * cubeUV_maxTileSize);\n  vec2 uv = getUV(direction, face) * (faceSize - 1.0);\n  vec2 f = fract(uv);\n  uv += 0.5 - f;\n  if (face > 2.0) {\n    uv.y += faceSize;\n    face -= 3.0;\n  }\n  uv.x += face * faceSize;\n  if(mipInt < cubeUV_maxMipLevel){\n    uv.y += 2.0 * cubeUV_maxTileSize;\n  }\n  uv.y += filterInt * 2.0 * cubeUV_minTileSize;\n  uv.x += 3.0 * max(0.0, cubeUV_maxTileSize - 2.0 * faceSize);\n  uv *= texelSize;\n  vec3 tl = envMapTexelToLinear(texture2D(envMap, uv)).rgb;\n  uv.x += texelSize;\n  vec3 tr = envMapTexelToLinear(texture2D(envMap, uv)).rgb;\n  uv.y += texelSize;\n  vec3 br = envMapTexelToLinear(texture2D(envMap, uv)).rgb;\n  uv.x -= texelSize;\n  vec3 bl = envMapTexelToLinear(texture2D(envMap, uv)).rgb;\n  vec3 tm = mix(tl, tr, f.x);\n  vec3 bm = mix(bl, br, f.x);\n  return mix(tm, bm, f.y);\n}\n#define r0 1.0\n#define v0 0.339\n#define m0 -2.0\n#define r1 0.8\n#define v1 0.276\n#define m1 -1.0\n#define r4 0.4\n#define v4 0.046\n#define m4 2.0\n#define r5 0.305\n#define v5 0.016\n#define m5 3.0\n#define r6 0.21\n#define v6 0.0038\n#define m6 4.0\nfloat roughnessToMip(float roughness) {\n  float mip = 0.0;\n  if (roughness >= r1) {\n    mip = (r0 - roughness) * (m1 - m0) / (r0 - r1) + m0;\n  } else if (roughness >= r4) {\n    mip = (r1 - roughness) * (m4 - m1) / (r1 - r4) + m1;\n  } else if (roughness >= r5) {\n    mip = (r4 - roughness) * (m5 - m4) / (r4 - r5) + m4;\n  } else if (roughness >= r6) {\n    mip = (r5 - roughness) * (m6 - m5) / (r5 - r6) + m5;\n  } else {\n    mip = -2.0 * log2(1.16 * roughness);  }\n  return mip;\n}\nvec4 textureCubeUV(sampler2D envMap, vec3 sampleDir, float roughness) {\n  float mip = clamp(roughnessToMip(roughness), m0, cubeUV_maxMipLevel);\n  float mipF = fract(mip);\n  float mipInt = floor(mip);\n  vec3 color0 = bilinearCubeUV(envMap, sampleDir, mipInt);\n  if (mipF == 0.0) {\n    return vec4(color0, 1.0);\n  } else {\n    vec3 color1 = bilinearCubeUV(envMap, sampleDir, mipInt + 1.0);\n    return vec4(mix(color0, color1, mipF), 1.0);\n  }\n}\n#endif";

	var defaultnormal_vertex = "vec3 transformedNormal = objectNormal;\n#ifdef USE_INSTANCING\n\tmat3 m = mat3( instanceMatrix );\n\ttransformedNormal /= vec3( dot( m[ 0 ], m[ 0 ] ), dot( m[ 1 ], m[ 1 ] ), dot( m[ 2 ], m[ 2 ] ) );\n\ttransformedNormal = m * transformedNormal;\n#endif\ntransformedNormal = normalMatrix * transformedNormal;\n#ifdef FLIP_SIDED\n\ttransformedNormal = - transformedNormal;\n#endif\n#ifdef USE_TANGENT\n\tvec3 transformedTangent = ( modelViewMatrix * vec4( objectTangent, 0.0 ) ).xyz;\n\t#ifdef FLIP_SIDED\n\t\ttransformedTangent = - transformedTangent;\n\t#endif\n#endif";

	var displacementmap_pars_vertex = "#ifdef USE_DISPLACEMENTMAP\n\tuniform sampler2D displacementMap;\n\tuniform float displacementScale;\n\tuniform float displacementBias;\n#endif";

	var displacementmap_vertex = "#ifdef USE_DISPLACEMENTMAP\n\ttransformed += normalize( objectNormal ) * ( texture2D( displacementMap, vUv ).x * displacementScale + displacementBias );\n#endif";

	var emissivemap_fragment = "#ifdef USE_EMISSIVEMAP\n\tvec4 emissiveColor = texture2D( emissiveMap, vUv );\n\temissiveColor.rgb = emissiveMapTexelToLinear( emissiveColor ).rgb;\n\ttotalEmissiveRadiance *= emissiveColor.rgb;\n#endif";

	var emissivemap_pars_fragment = "#ifdef USE_EMISSIVEMAP\n\tuniform sampler2D emissiveMap;\n#endif";

	var encodings_fragment = "gl_FragColor = linearToOutputTexel( gl_FragColor );";

	var encodings_pars_fragment = "\nvec4 LinearToLinear( in vec4 value ) {\n\treturn value;\n}\nvec4 GammaToLinear( in vec4 value, in float gammaFactor ) {\n\treturn vec4( pow( value.rgb, vec3( gammaFactor ) ), value.a );\n}\nvec4 LinearToGamma( in vec4 value, in float gammaFactor ) {\n\treturn vec4( pow( value.rgb, vec3( 1.0 / gammaFactor ) ), value.a );\n}\nvec4 sRGBToLinear( in vec4 value ) {\n\treturn vec4( mix( pow( value.rgb * 0.9478672986 + vec3( 0.0521327014 ), vec3( 2.4 ) ), value.rgb * 0.0773993808, vec3( lessThanEqual( value.rgb, vec3( 0.04045 ) ) ) ), value.a );\n}\nvec4 LinearTosRGB( in vec4 value ) {\n\treturn vec4( mix( pow( value.rgb, vec3( 0.41666 ) ) * 1.055 - vec3( 0.055 ), value.rgb * 12.92, vec3( lessThanEqual( value.rgb, vec3( 0.0031308 ) ) ) ), value.a );\n}\nvec4 RGBEToLinear( in vec4 value ) {\n\treturn vec4( value.rgb * exp2( value.a * 255.0 - 128.0 ), 1.0 );\n}\nvec4 LinearToRGBE( in vec4 value ) {\n\tfloat maxComponent = max( max( value.r, value.g ), value.b );\n\tfloat fExp = clamp( ceil( log2( maxComponent ) ), -128.0, 127.0 );\n\treturn vec4( value.rgb / exp2( fExp ), ( fExp + 128.0 ) / 255.0 );\n}\nvec4 RGBMToLinear( in vec4 value, in float maxRange ) {\n\treturn vec4( value.rgb * value.a * maxRange, 1.0 );\n}\nvec4 LinearToRGBM( in vec4 value, in float maxRange ) {\n\tfloat maxRGB = max( value.r, max( value.g, value.b ) );\n\tfloat M = clamp( maxRGB / maxRange, 0.0, 1.0 );\n\tM = ceil( M * 255.0 ) / 255.0;\n\treturn vec4( value.rgb / ( M * maxRange ), M );\n}\nvec4 RGBDToLinear( in vec4 value, in float maxRange ) {\n\treturn vec4( value.rgb * ( ( maxRange / 255.0 ) / value.a ), 1.0 );\n}\nvec4 LinearToRGBD( in vec4 value, in float maxRange ) {\n\tfloat maxRGB = max( value.r, max( value.g, value.b ) );\n\tfloat D = max( maxRange / maxRGB, 1.0 );\n\tD = clamp( floor( D ) / 255.0, 0.0, 1.0 );\n\treturn vec4( value.rgb * ( D * ( 255.0 / maxRange ) ), D );\n}\nconst mat3 cLogLuvM = mat3( 0.2209, 0.3390, 0.4184, 0.1138, 0.6780, 0.7319, 0.0102, 0.1130, 0.2969 );\nvec4 LinearToLogLuv( in vec4 value )  {\n\tvec3 Xp_Y_XYZp = cLogLuvM * value.rgb;\n\tXp_Y_XYZp = max( Xp_Y_XYZp, vec3( 1e-6, 1e-6, 1e-6 ) );\n\tvec4 vResult;\n\tvResult.xy = Xp_Y_XYZp.xy / Xp_Y_XYZp.z;\n\tfloat Le = 2.0 * log2(Xp_Y_XYZp.y) + 127.0;\n\tvResult.w = fract( Le );\n\tvResult.z = ( Le - ( floor( vResult.w * 255.0 ) ) / 255.0 ) / 255.0;\n\treturn vResult;\n}\nconst mat3 cLogLuvInverseM = mat3( 6.0014, -2.7008, -1.7996, -1.3320, 3.1029, -5.7721, 0.3008, -1.0882, 5.6268 );\nvec4 LogLuvToLinear( in vec4 value ) {\n\tfloat Le = value.z * 255.0 + value.w;\n\tvec3 Xp_Y_XYZp;\n\tXp_Y_XYZp.y = exp2( ( Le - 127.0 ) / 2.0 );\n\tXp_Y_XYZp.z = Xp_Y_XYZp.y / value.y;\n\tXp_Y_XYZp.x = value.x * Xp_Y_XYZp.z;\n\tvec3 vRGB = cLogLuvInverseM * Xp_Y_XYZp.rgb;\n\treturn vec4( max( vRGB, 0.0 ), 1.0 );\n}";

	var envmap_fragment = "#ifdef USE_ENVMAP\n\t#ifdef ENV_WORLDPOS\n\t\tvec3 cameraToFrag;\n\t\t\n\t\tif ( isOrthographic ) {\n\t\t\tcameraToFrag = normalize( vec3( - viewMatrix[ 0 ][ 2 ], - viewMatrix[ 1 ][ 2 ], - viewMatrix[ 2 ][ 2 ] ) );\n\t\t}  else {\n\t\t\tcameraToFrag = normalize( vWorldPosition - cameraPosition );\n\t\t}\n\t\tvec3 worldNormal = inverseTransformDirection( normal, viewMatrix );\n\t\t#ifdef ENVMAP_MODE_REFLECTION\n\t\t\tvec3 reflectVec = reflect( cameraToFrag, worldNormal );\n\t\t#else\n\t\t\tvec3 reflectVec = refract( cameraToFrag, worldNormal, refractionRatio );\n\t\t#endif\n\t#else\n\t\tvec3 reflectVec = vReflect;\n\t#endif\n\t#ifdef ENVMAP_TYPE_CUBE\n\t\tvec4 envColor = textureCube( envMap, vec3( flipEnvMap * reflectVec.x, reflectVec.yz ) );\n\t#elif defined( ENVMAP_TYPE_CUBE_UV )\n\t\tvec4 envColor = textureCubeUV( envMap, reflectVec, 0.0 );\n\t#elif defined( ENVMAP_TYPE_EQUIREC )\n\t\tvec2 sampleUV;\n\t\treflectVec = normalize( reflectVec );\n\t\tsampleUV.y = asin( clamp( reflectVec.y, - 1.0, 1.0 ) ) * RECIPROCAL_PI + 0.5;\n\t\tsampleUV.x = atan( reflectVec.z, reflectVec.x ) * RECIPROCAL_PI2 + 0.5;\n\t\tvec4 envColor = texture2D( envMap, sampleUV );\n\t#elif defined( ENVMAP_TYPE_SPHERE )\n\t\treflectVec = normalize( reflectVec );\n\t\tvec3 reflectView = normalize( ( viewMatrix * vec4( reflectVec, 0.0 ) ).xyz + vec3( 0.0, 0.0, 1.0 ) );\n\t\tvec4 envColor = texture2D( envMap, reflectView.xy * 0.5 + 0.5 );\n\t#else\n\t\tvec4 envColor = vec4( 0.0 );\n\t#endif\n\t#ifndef ENVMAP_TYPE_CUBE_UV\n\t\tenvColor = envMapTexelToLinear( envColor );\n\t#endif\n\t#ifdef ENVMAP_BLENDING_MULTIPLY\n\t\toutgoingLight = mix( outgoingLight, outgoingLight * envColor.xyz, specularStrength * reflectivity );\n\t#elif defined( ENVMAP_BLENDING_MIX )\n\t\toutgoingLight = mix( outgoingLight, envColor.xyz, specularStrength * reflectivity );\n\t#elif defined( ENVMAP_BLENDING_ADD )\n\t\toutgoingLight += envColor.xyz * specularStrength * reflectivity;\n\t#endif\n#endif";

	var envmap_common_pars_fragment = "#ifdef USE_ENVMAP\n\tuniform float envMapIntensity;\n\tuniform float flipEnvMap;\n\tuniform int maxMipLevel;\n\t#ifdef ENVMAP_TYPE_CUBE\n\t\tuniform samplerCube envMap;\n\t#else\n\t\tuniform sampler2D envMap;\n\t#endif\n\t\n#endif";

	var envmap_pars_fragment = "#ifdef USE_ENVMAP\n\tuniform float reflectivity;\n\t#if defined( USE_BUMPMAP ) || defined( USE_NORMALMAP ) || defined( PHONG )\n\t\t#define ENV_WORLDPOS\n\t#endif\n\t#ifdef ENV_WORLDPOS\n\t\tvarying vec3 vWorldPosition;\n\t\tuniform float refractionRatio;\n\t#else\n\t\tvarying vec3 vReflect;\n\t#endif\n#endif";

	var envmap_pars_vertex = "#ifdef USE_ENVMAP\n\t#if defined( USE_BUMPMAP ) || defined( USE_NORMALMAP ) ||defined( PHONG )\n\t\t#define ENV_WORLDPOS\n\t#endif\n\t#ifdef ENV_WORLDPOS\n\t\t\n\t\tvarying vec3 vWorldPosition;\n\t#else\n\t\tvarying vec3 vReflect;\n\t\tuniform float refractionRatio;\n\t#endif\n#endif";

	var envmap_vertex = "#ifdef USE_ENVMAP\n\t#ifdef ENV_WORLDPOS\n\t\tvWorldPosition = worldPosition.xyz;\n\t#else\n\t\tvec3 cameraToVertex;\n\t\tif ( isOrthographic ) { \n\t\t\tcameraToVertex = normalize( vec3( - viewMatrix[ 0 ][ 2 ], - viewMatrix[ 1 ][ 2 ], - viewMatrix[ 2 ][ 2 ] ) );\n\t\t} else {\n\t\t\tcameraToVertex = normalize( worldPosition.xyz - cameraPosition );\n\t\t}\n\t\tvec3 worldNormal = inverseTransformDirection( transformedNormal, viewMatrix );\n\t\t#ifdef ENVMAP_MODE_REFLECTION\n\t\t\tvReflect = reflect( cameraToVertex, worldNormal );\n\t\t#else\n\t\t\tvReflect = refract( cameraToVertex, worldNormal, refractionRatio );\n\t\t#endif\n\t#endif\n#endif";

	var fog_vertex = "#ifdef USE_FOG\n\tfogDepth = -mvPosition.z;\n#endif";

	var fog_pars_vertex = "#ifdef USE_FOG\n\tvarying float fogDepth;\n#endif";

	var fog_fragment = "#ifdef USE_FOG\n\t#ifdef FOG_EXP2\n\t\tfloat fogFactor = 1.0 - exp( - fogDensity * fogDensity * fogDepth * fogDepth );\n\t#else\n\t\tfloat fogFactor = smoothstep( fogNear, fogFar, fogDepth );\n\t#endif\n\tgl_FragColor.rgb = mix( gl_FragColor.rgb, fogColor, fogFactor );\n#endif";

	var fog_pars_fragment = "#ifdef USE_FOG\n\tuniform vec3 fogColor;\n\tvarying float fogDepth;\n\t#ifdef FOG_EXP2\n\t\tuniform float fogDensity;\n\t#else\n\t\tuniform float fogNear;\n\t\tuniform float fogFar;\n\t#endif\n#endif";

	var gradientmap_pars_fragment = "#ifdef USE_GRADIENTMAP\n\tuniform sampler2D gradientMap;\n#endif\nvec3 getGradientIrradiance( vec3 normal, vec3 lightDirection ) {\n\tfloat dotNL = dot( normal, lightDirection );\n\tvec2 coord = vec2( dotNL * 0.5 + 0.5, 0.0 );\n\t#ifdef USE_GRADIENTMAP\n\t\treturn texture2D( gradientMap, coord ).rgb;\n\t#else\n\t\treturn ( coord.x < 0.7 ) ? vec3( 0.7 ) : vec3( 1.0 );\n\t#endif\n}";

	var lightmap_fragment = "#ifdef USE_LIGHTMAP\n\tvec4 lightMapTexel= texture2D( lightMap, vUv2 );\n\treflectedLight.indirectDiffuse += PI * lightMapTexelToLinear( lightMapTexel ).rgb * lightMapIntensity;\n#endif";

	var lightmap_pars_fragment = "#ifdef USE_LIGHTMAP\n\tuniform sampler2D lightMap;\n\tuniform float lightMapIntensity;\n#endif";

	var lights_lambert_vertex = "vec3 diffuse = vec3( 1.0 );\nGeometricContext geometry;\ngeometry.position = mvPosition.xyz;\ngeometry.normal = normalize( transformedNormal );\ngeometry.viewDir = ( isOrthographic ) ? vec3( 0, 0, 1 ) : normalize( -mvPosition.xyz );\nGeometricContext backGeometry;\nbackGeometry.position = geometry.position;\nbackGeometry.normal = -geometry.normal;\nbackGeometry.viewDir = geometry.viewDir;\nvLightFront = vec3( 0.0 );\nvIndirectFront = vec3( 0.0 );\n#ifdef DOUBLE_SIDED\n\tvLightBack = vec3( 0.0 );\n\tvIndirectBack = vec3( 0.0 );\n#endif\nIncidentLight directLight;\nfloat dotNL;\nvec3 directLightColor_Diffuse;\n#if NUM_POINT_LIGHTS > 0\n\t#pragma unroll_loop\n\tfor ( int i = 0; i < NUM_POINT_LIGHTS; i ++ ) {\n\t\tgetPointDirectLightIrradiance( pointLights[ i ], geometry, directLight );\n\t\tdotNL = dot( geometry.normal, directLight.direction );\n\t\tdirectLightColor_Diffuse = PI * directLight.color;\n\t\tvLightFront += saturate( dotNL ) * directLightColor_Diffuse;\n\t\t#ifdef DOUBLE_SIDED\n\t\t\tvLightBack += saturate( -dotNL ) * directLightColor_Diffuse;\n\t\t#endif\n\t}\n#endif\n#if NUM_SPOT_LIGHTS > 0\n\t#pragma unroll_loop\n\tfor ( int i = 0; i < NUM_SPOT_LIGHTS; i ++ ) {\n\t\tgetSpotDirectLightIrradiance( spotLights[ i ], geometry, directLight );\n\t\tdotNL = dot( geometry.normal, directLight.direction );\n\t\tdirectLightColor_Diffuse = PI * directLight.color;\n\t\tvLightFront += saturate( dotNL ) * directLightColor_Diffuse;\n\t\t#ifdef DOUBLE_SIDED\n\t\t\tvLightBack += saturate( -dotNL ) * directLightColor_Diffuse;\n\t\t#endif\n\t}\n#endif\n#if NUM_DIR_LIGHTS > 0\n\t#pragma unroll_loop\n\tfor ( int i = 0; i < NUM_DIR_LIGHTS; i ++ ) {\n\t\tgetDirectionalDirectLightIrradiance( directionalLights[ i ], geometry, directLight );\n\t\tdotNL = dot( geometry.normal, directLight.direction );\n\t\tdirectLightColor_Diffuse = PI * directLight.color;\n\t\tvLightFront += saturate( dotNL ) * directLightColor_Diffuse;\n\t\t#ifdef DOUBLE_SIDED\n\t\t\tvLightBack += saturate( -dotNL ) * directLightColor_Diffuse;\n\t\t#endif\n\t}\n#endif\n#if NUM_HEMI_LIGHTS > 0\n\t#pragma unroll_loop\n\tfor ( int i = 0; i < NUM_HEMI_LIGHTS; i ++ ) {\n\t\tvIndirectFront += getHemisphereLightIrradiance( hemisphereLights[ i ], geometry );\n\t\t#ifdef DOUBLE_SIDED\n\t\t\tvIndirectBack += getHemisphereLightIrradiance( hemisphereLights[ i ], backGeometry );\n\t\t#endif\n\t}\n#endif";

	var lights_pars_begin = "uniform bool receiveShadow;\nuniform vec3 ambientLightColor;\nuniform vec3 lightProbe[ 9 ];\nvec3 shGetIrradianceAt( in vec3 normal, in vec3 shCoefficients[ 9 ] ) {\n\tfloat x = normal.x, y = normal.y, z = normal.z;\n\tvec3 result = shCoefficients[ 0 ] * 0.886227;\n\tresult += shCoefficients[ 1 ] * 2.0 * 0.511664 * y;\n\tresult += shCoefficients[ 2 ] * 2.0 * 0.511664 * z;\n\tresult += shCoefficients[ 3 ] * 2.0 * 0.511664 * x;\n\tresult += shCoefficients[ 4 ] * 2.0 * 0.429043 * x * y;\n\tresult += shCoefficients[ 5 ] * 2.0 * 0.429043 * y * z;\n\tresult += shCoefficients[ 6 ] * ( 0.743125 * z * z - 0.247708 );\n\tresult += shCoefficients[ 7 ] * 2.0 * 0.429043 * x * z;\n\tresult += shCoefficients[ 8 ] * 0.429043 * ( x * x - y * y );\n\treturn result;\n}\nvec3 getLightProbeIrradiance( const in vec3 lightProbe[ 9 ], const in GeometricContext geometry ) {\n\tvec3 worldNormal = inverseTransformDirection( geometry.normal, viewMatrix );\n\tvec3 irradiance = shGetIrradianceAt( worldNormal, lightProbe );\n\treturn irradiance;\n}\nvec3 getAmbientLightIrradiance( const in vec3 ambientLightColor ) {\n\tvec3 irradiance = ambientLightColor;\n\t#ifndef PHYSICALLY_CORRECT_LIGHTS\n\t\tirradiance *= PI;\n\t#endif\n\treturn irradiance;\n}\n#if NUM_DIR_LIGHTS > 0\n\tstruct DirectionalLight {\n\t\tvec3 direction;\n\t\tvec3 color;\n\t};\n\tuniform DirectionalLight directionalLights[ NUM_DIR_LIGHTS ];\n\t#if defined( USE_SHADOWMAP ) && NUM_DIR_LIGHT_SHADOWS > 0\n\t\tstruct DirectionalLightShadow {\n\t\t\tfloat shadowBias;\n\t\t\tfloat shadowRadius;\n\t\t\tvec2 shadowMapSize;\n\t\t};\n\t\tuniform DirectionalLightShadow directionalLightShadows[ NUM_DIR_LIGHT_SHADOWS ];\n\t#endif\n\tvoid getDirectionalDirectLightIrradiance( const in DirectionalLight directionalLight, const in GeometricContext geometry, out IncidentLight directLight ) {\n\t\tdirectLight.color = directionalLight.color;\n\t\tdirectLight.direction = directionalLight.direction;\n\t\tdirectLight.visible = true;\n\t}\n#endif\n#if NUM_POINT_LIGHTS > 0\n\tstruct PointLight {\n\t\tvec3 position;\n\t\tvec3 color;\n\t\tfloat distance;\n\t\tfloat decay;\n\t};\n\tuniform PointLight pointLights[ NUM_POINT_LIGHTS ];\n\t#if defined( USE_SHADOWMAP ) && NUM_POINT_LIGHT_SHADOWS > 0\n\t\tstruct PointLightShadow {\n\t\t\tfloat shadowBias;\n\t\t\tfloat shadowRadius;\n\t\t\tvec2 shadowMapSize;\n\t\t\tfloat shadowCameraNear;\n\t\t\tfloat shadowCameraFar;\n\t\t};\n\t\tuniform PointLightShadow pointLightShadows[ NUM_POINT_LIGHT_SHADOWS ];\n\t#endif\n\tvoid getPointDirectLightIrradiance( const in PointLight pointLight, const in GeometricContext geometry, out IncidentLight directLight ) {\n\t\tvec3 lVector = pointLight.position - geometry.position;\n\t\tdirectLight.direction = normalize( lVector );\n\t\tfloat lightDistance = length( lVector );\n\t\tdirectLight.color = pointLight.color;\n\t\tdirectLight.color *= punctualLightIntensityToIrradianceFactor( lightDistance, pointLight.distance, pointLight.decay );\n\t\tdirectLight.visible = ( directLight.color != vec3( 0.0 ) );\n\t}\n#endif\n#if NUM_SPOT_LIGHTS > 0\n\tstruct SpotLight {\n\t\tvec3 position;\n\t\tvec3 direction;\n\t\tvec3 color;\n\t\tfloat distance;\n\t\tfloat decay;\n\t\tfloat coneCos;\n\t\tfloat penumbraCos;\n\t};\n\tuniform SpotLight spotLights[ NUM_SPOT_LIGHTS ];\n\t#if defined( USE_SHADOWMAP ) && NUM_SPOT_LIGHT_SHADOWS > 0\n\t\tstruct SpotLightShadow {\n\t\t\tfloat shadowBias;\n\t\t\tfloat shadowRadius;\n\t\t\tvec2 shadowMapSize;\n\t\t};\n\t\tuniform SpotLightShadow spotLightShadows[ NUM_SPOT_LIGHT_SHADOWS ];\n\t#endif\n\tvoid getSpotDirectLightIrradiance( const in SpotLight spotLight, const in GeometricContext geometry, out IncidentLight directLight  ) {\n\t\tvec3 lVector = spotLight.position - geometry.position;\n\t\tdirectLight.direction = normalize( lVector );\n\t\tfloat lightDistance = length( lVector );\n\t\tfloat angleCos = dot( directLight.direction, spotLight.direction );\n\t\tif ( angleCos > spotLight.coneCos ) {\n\t\t\tfloat spotEffect = smoothstep( spotLight.coneCos, spotLight.penumbraCos, angleCos );\n\t\t\tdirectLight.color = spotLight.color;\n\t\t\tdirectLight.color *= spotEffect * punctualLightIntensityToIrradianceFactor( lightDistance, spotLight.distance, spotLight.decay );\n\t\t\tdirectLight.visible = true;\n\t\t} else {\n\t\t\tdirectLight.color = vec3( 0.0 );\n\t\t\tdirectLight.visible = false;\n\t\t}\n\t}\n#endif\n#if NUM_RECT_AREA_LIGHTS > 0\n\tstruct RectAreaLight {\n\t\tvec3 color;\n\t\tvec3 position;\n\t\tvec3 halfWidth;\n\t\tvec3 halfHeight;\n\t};\n\tuniform sampler2D ltc_1;\tuniform sampler2D ltc_2;\n\tuniform RectAreaLight rectAreaLights[ NUM_RECT_AREA_LIGHTS ];\n#endif\n#if NUM_HEMI_LIGHTS > 0\n\tstruct HemisphereLight {\n\t\tvec3 direction;\n\t\tvec3 skyColor;\n\t\tvec3 groundColor;\n\t};\n\tuniform HemisphereLight hemisphereLights[ NUM_HEMI_LIGHTS ];\n\tvec3 getHemisphereLightIrradiance( const in HemisphereLight hemiLight, const in GeometricContext geometry ) {\n\t\tfloat dotNL = dot( geometry.normal, hemiLight.direction );\n\t\tfloat hemiDiffuseWeight = 0.5 * dotNL + 0.5;\n\t\tvec3 irradiance = mix( hemiLight.groundColor, hemiLight.skyColor, hemiDiffuseWeight );\n\t\t#ifndef PHYSICALLY_CORRECT_LIGHTS\n\t\t\tirradiance *= PI;\n\t\t#endif\n\t\treturn irradiance;\n\t}\n#endif";

	var envmap_physical_pars_fragment = "#if defined( USE_ENVMAP )\n\t#ifdef ENVMAP_MODE_REFRACTION\n\t\tuniform float refractionRatio;\n\t#endif\n\tvec3 getLightProbeIndirectIrradiance( const in GeometricContext geometry, const in int maxMIPLevel ) {\n\t\tvec3 worldNormal = inverseTransformDirection( geometry.normal, viewMatrix );\n\t\t#ifdef ENVMAP_TYPE_CUBE\n\t\t\tvec3 queryVec = vec3( flipEnvMap * worldNormal.x, worldNormal.yz );\n\t\t\t#ifdef TEXTURE_LOD_EXT\n\t\t\t\tvec4 envMapColor = textureCubeLodEXT( envMap, queryVec, float( maxMIPLevel ) );\n\t\t\t#else\n\t\t\t\tvec4 envMapColor = textureCube( envMap, queryVec, float( maxMIPLevel ) );\n\t\t\t#endif\n\t\t\tenvMapColor.rgb = envMapTexelToLinear( envMapColor ).rgb;\n\t\t#elif defined( ENVMAP_TYPE_CUBE_UV )\n\t\t\tvec4 envMapColor = textureCubeUV( envMap, worldNormal, 1.0 );\n\t\t#else\n\t\t\tvec4 envMapColor = vec4( 0.0 );\n\t\t#endif\n\t\treturn PI * envMapColor.rgb * envMapIntensity;\n\t}\n\tfloat getSpecularMIPLevel( const in float roughness, const in int maxMIPLevel ) {\n\t\tfloat maxMIPLevelScalar = float( maxMIPLevel );\n\t\tfloat sigma = PI * roughness * roughness / ( 1.0 + roughness );\n\t\tfloat desiredMIPLevel = maxMIPLevelScalar + log2( sigma );\n\t\treturn clamp( desiredMIPLevel, 0.0, maxMIPLevelScalar );\n\t}\n\tvec3 getLightProbeIndirectRadiance( const in vec3 viewDir, const in vec3 normal, const in float roughness, const in int maxMIPLevel ) {\n\t\t#ifdef ENVMAP_MODE_REFLECTION\n\t\t  vec3 reflectVec = reflect( -viewDir, normal );\n\t\t  reflectVec = normalize( mix( reflectVec, normal, roughness * roughness) );\n\t\t#else\n\t\t  vec3 reflectVec = refract( -viewDir, normal, refractionRatio );\n\t\t#endif\n\t\treflectVec = inverseTransformDirection( reflectVec, viewMatrix );\n\t\tfloat specularMIPLevel = getSpecularMIPLevel( roughness, maxMIPLevel );\n\t\t#ifdef ENVMAP_TYPE_CUBE\n\t\t\tvec3 queryReflectVec = vec3( flipEnvMap * reflectVec.x, reflectVec.yz );\n\t\t\t#ifdef TEXTURE_LOD_EXT\n\t\t\t\tvec4 envMapColor = textureCubeLodEXT( envMap, queryReflectVec, specularMIPLevel );\n\t\t\t#else\n\t\t\t\tvec4 envMapColor = textureCube( envMap, queryReflectVec, specularMIPLevel );\n\t\t\t#endif\n\t\t\tenvMapColor.rgb = envMapTexelToLinear( envMapColor ).rgb;\n\t\t#elif defined( ENVMAP_TYPE_CUBE_UV )\n\t\t\tvec4 envMapColor = textureCubeUV( envMap, reflectVec, roughness );\n\t\t#elif defined( ENVMAP_TYPE_EQUIREC )\n\t\t\tvec2 sampleUV;\n\t\t\tsampleUV.y = asin( clamp( reflectVec.y, - 1.0, 1.0 ) ) * RECIPROCAL_PI + 0.5;\n\t\t\tsampleUV.x = atan( reflectVec.z, reflectVec.x ) * RECIPROCAL_PI2 + 0.5;\n\t\t\t#ifdef TEXTURE_LOD_EXT\n\t\t\t\tvec4 envMapColor = texture2DLodEXT( envMap, sampleUV, specularMIPLevel );\n\t\t\t#else\n\t\t\t\tvec4 envMapColor = texture2D( envMap, sampleUV, specularMIPLevel );\n\t\t\t#endif\n\t\t\tenvMapColor.rgb = envMapTexelToLinear( envMapColor ).rgb;\n\t\t#elif defined( ENVMAP_TYPE_SPHERE )\n\t\t\tvec3 reflectView = normalize( ( viewMatrix * vec4( reflectVec, 0.0 ) ).xyz + vec3( 0.0,0.0,1.0 ) );\n\t\t\t#ifdef TEXTURE_LOD_EXT\n\t\t\t\tvec4 envMapColor = texture2DLodEXT( envMap, reflectView.xy * 0.5 + 0.5, specularMIPLevel );\n\t\t\t#else\n\t\t\t\tvec4 envMapColor = texture2D( envMap, reflectView.xy * 0.5 + 0.5, specularMIPLevel );\n\t\t\t#endif\n\t\t\tenvMapColor.rgb = envMapTexelToLinear( envMapColor ).rgb;\n\t\t#endif\n\t\treturn envMapColor.rgb * envMapIntensity;\n\t}\n#endif";

	var lights_toon_fragment = "ToonMaterial material;\nmaterial.diffuseColor = diffuseColor.rgb;\nmaterial.specularColor = specular;\nmaterial.specularShininess = shininess;\nmaterial.specularStrength = specularStrength;";

	var lights_toon_pars_fragment = "varying vec3 vViewPosition;\n#ifndef FLAT_SHADED\n\tvarying vec3 vNormal;\n#endif\nstruct ToonMaterial {\n\tvec3\tdiffuseColor;\n\tvec3\tspecularColor;\n\tfloat\tspecularShininess;\n\tfloat\tspecularStrength;\n};\nvoid RE_Direct_Toon( const in IncidentLight directLight, const in GeometricContext geometry, const in ToonMaterial material, inout ReflectedLight reflectedLight ) {\n\tvec3 irradiance = getGradientIrradiance( geometry.normal, directLight.direction ) * directLight.color;\n\t#ifndef PHYSICALLY_CORRECT_LIGHTS\n\t\tirradiance *= PI;\n\t#endif\n\treflectedLight.directDiffuse += irradiance * BRDF_Diffuse_Lambert( material.diffuseColor );\n\treflectedLight.directSpecular += irradiance * BRDF_Specular_BlinnPhong( directLight, geometry, material.specularColor, material.specularShininess ) * material.specularStrength;\n}\nvoid RE_IndirectDiffuse_Toon( const in vec3 irradiance, const in GeometricContext geometry, const in ToonMaterial material, inout ReflectedLight reflectedLight ) {\n\treflectedLight.indirectDiffuse += irradiance * BRDF_Diffuse_Lambert( material.diffuseColor );\n}\n#define RE_Direct\t\t\t\tRE_Direct_Toon\n#define RE_IndirectDiffuse\t\tRE_IndirectDiffuse_Toon\n#define Material_LightProbeLOD( material )\t(0)";

	var lights_phong_fragment = "BlinnPhongMaterial material;\nmaterial.diffuseColor = diffuseColor.rgb;\nmaterial.specularColor = specular;\nmaterial.specularShininess = shininess;\nmaterial.specularStrength = specularStrength;";

	var lights_phong_pars_fragment = "varying vec3 vViewPosition;\n#ifndef FLAT_SHADED\n\tvarying vec3 vNormal;\n#endif\nstruct BlinnPhongMaterial {\n\tvec3\tdiffuseColor;\n\tvec3\tspecularColor;\n\tfloat\tspecularShininess;\n\tfloat\tspecularStrength;\n};\nvoid RE_Direct_BlinnPhong( const in IncidentLight directLight, const in GeometricContext geometry, const in BlinnPhongMaterial material, inout ReflectedLight reflectedLight ) {\n\tfloat dotNL = saturate( dot( geometry.normal, directLight.direction ) );\n\tvec3 irradiance = dotNL * directLight.color;\n\t#ifndef PHYSICALLY_CORRECT_LIGHTS\n\t\tirradiance *= PI;\n\t#endif\n\treflectedLight.directDiffuse += irradiance * BRDF_Diffuse_Lambert( material.diffuseColor );\n\treflectedLight.directSpecular += irradiance * BRDF_Specular_BlinnPhong( directLight, geometry, material.specularColor, material.specularShininess ) * material.specularStrength;\n}\nvoid RE_IndirectDiffuse_BlinnPhong( const in vec3 irradiance, const in GeometricContext geometry, const in BlinnPhongMaterial material, inout ReflectedLight reflectedLight ) {\n\treflectedLight.indirectDiffuse += irradiance * BRDF_Diffuse_Lambert( material.diffuseColor );\n}\n#define RE_Direct\t\t\t\tRE_Direct_BlinnPhong\n#define RE_IndirectDiffuse\t\tRE_IndirectDiffuse_BlinnPhong\n#define Material_LightProbeLOD( material )\t(0)";

	var lights_physical_fragment = "PhysicalMaterial material;\nmaterial.diffuseColor = diffuseColor.rgb * ( 1.0 - metalnessFactor );\nvec3 dxy = max( abs( dFdx( geometryNormal ) ), abs( dFdy( geometryNormal ) ) );\nfloat geometryRoughness = max( max( dxy.x, dxy.y ), dxy.z );\nmaterial.specularRoughness = max( roughnessFactor, 0.0525 );material.specularRoughness += geometryRoughness;\nmaterial.specularRoughness = min( material.specularRoughness, 1.0 );\n#ifdef REFLECTIVITY\n\tmaterial.specularColor = mix( vec3( MAXIMUM_SPECULAR_COEFFICIENT * pow2( reflectivity ) ), diffuseColor.rgb, metalnessFactor );\n#else\n\tmaterial.specularColor = mix( vec3( DEFAULT_SPECULAR_COEFFICIENT ), diffuseColor.rgb, metalnessFactor );\n#endif\n#ifdef CLEARCOAT\n\tmaterial.clearcoat = saturate( clearcoat );\tmaterial.clearcoatRoughness = max( clearcoatRoughness, 0.0525 );\n\tmaterial.clearcoatRoughness += geometryRoughness;\n\tmaterial.clearcoatRoughness = min( material.clearcoatRoughness, 1.0 );\n#endif\n#ifdef USE_SHEEN\n\tmaterial.sheenColor = sheen;\n#endif";

	var lights_physical_pars_fragment = "struct PhysicalMaterial {\n\tvec3\tdiffuseColor;\n\tfloat\tspecularRoughness;\n\tvec3\tspecularColor;\n#ifdef CLEARCOAT\n\tfloat clearcoat;\n\tfloat clearcoatRoughness;\n#endif\n#ifdef USE_SHEEN\n\tvec3 sheenColor;\n#endif\n};\n#define MAXIMUM_SPECULAR_COEFFICIENT 0.16\n#define DEFAULT_SPECULAR_COEFFICIENT 0.04\nfloat clearcoatDHRApprox( const in float roughness, const in float dotNL ) {\n\treturn DEFAULT_SPECULAR_COEFFICIENT + ( 1.0 - DEFAULT_SPECULAR_COEFFICIENT ) * ( pow( 1.0 - dotNL, 5.0 ) * pow( 1.0 - roughness, 2.0 ) );\n}\n#if NUM_RECT_AREA_LIGHTS > 0\n\tvoid RE_Direct_RectArea_Physical( const in RectAreaLight rectAreaLight, const in GeometricContext geometry, const in PhysicalMaterial material, inout ReflectedLight reflectedLight ) {\n\t\tvec3 normal = geometry.normal;\n\t\tvec3 viewDir = geometry.viewDir;\n\t\tvec3 position = geometry.position;\n\t\tvec3 lightPos = rectAreaLight.position;\n\t\tvec3 halfWidth = rectAreaLight.halfWidth;\n\t\tvec3 halfHeight = rectAreaLight.halfHeight;\n\t\tvec3 lightColor = rectAreaLight.color;\n\t\tfloat roughness = material.specularRoughness;\n\t\tvec3 rectCoords[ 4 ];\n\t\trectCoords[ 0 ] = lightPos + halfWidth - halfHeight;\t\trectCoords[ 1 ] = lightPos - halfWidth - halfHeight;\n\t\trectCoords[ 2 ] = lightPos - halfWidth + halfHeight;\n\t\trectCoords[ 3 ] = lightPos + halfWidth + halfHeight;\n\t\tvec2 uv = LTC_Uv( normal, viewDir, roughness );\n\t\tvec4 t1 = texture2D( ltc_1, uv );\n\t\tvec4 t2 = texture2D( ltc_2, uv );\n\t\tmat3 mInv = mat3(\n\t\t\tvec3( t1.x, 0, t1.y ),\n\t\t\tvec3(    0, 1,    0 ),\n\t\t\tvec3( t1.z, 0, t1.w )\n\t\t);\n\t\tvec3 fresnel = ( material.specularColor * t2.x + ( vec3( 1.0 ) - material.specularColor ) * t2.y );\n\t\treflectedLight.directSpecular += lightColor * fresnel * LTC_Evaluate( normal, viewDir, position, mInv, rectCoords );\n\t\treflectedLight.directDiffuse += lightColor * material.diffuseColor * LTC_Evaluate( normal, viewDir, position, mat3( 1.0 ), rectCoords );\n\t}\n#endif\nvoid RE_Direct_Physical( const in IncidentLight directLight, const in GeometricContext geometry, const in PhysicalMaterial material, inout ReflectedLight reflectedLight ) {\n\tfloat dotNL = saturate( dot( geometry.normal, directLight.direction ) );\n\tvec3 irradiance = dotNL * directLight.color;\n\t#ifndef PHYSICALLY_CORRECT_LIGHTS\n\t\tirradiance *= PI;\n\t#endif\n\t#ifdef CLEARCOAT\n\t\tfloat ccDotNL = saturate( dot( geometry.clearcoatNormal, directLight.direction ) );\n\t\tvec3 ccIrradiance = ccDotNL * directLight.color;\n\t\t#ifndef PHYSICALLY_CORRECT_LIGHTS\n\t\t\tccIrradiance *= PI;\n\t\t#endif\n\t\tfloat clearcoatDHR = material.clearcoat * clearcoatDHRApprox( material.clearcoatRoughness, ccDotNL );\n\t\treflectedLight.directSpecular += ccIrradiance * material.clearcoat * BRDF_Specular_GGX( directLight, geometry.viewDir, geometry.clearcoatNormal, vec3( DEFAULT_SPECULAR_COEFFICIENT ), material.clearcoatRoughness );\n\t#else\n\t\tfloat clearcoatDHR = 0.0;\n\t#endif\n\t#ifdef USE_SHEEN\n\t\treflectedLight.directSpecular += ( 1.0 - clearcoatDHR ) * irradiance * BRDF_Specular_Sheen(\n\t\t\tmaterial.specularRoughness,\n\t\t\tdirectLight.direction,\n\t\t\tgeometry,\n\t\t\tmaterial.sheenColor\n\t\t);\n\t#else\n\t\treflectedLight.directSpecular += ( 1.0 - clearcoatDHR ) * irradiance * BRDF_Specular_GGX( directLight, geometry.viewDir, geometry.normal, material.specularColor, material.specularRoughness);\n\t#endif\n\treflectedLight.directDiffuse += ( 1.0 - clearcoatDHR ) * irradiance * BRDF_Diffuse_Lambert( material.diffuseColor );\n}\nvoid RE_IndirectDiffuse_Physical( const in vec3 irradiance, const in GeometricContext geometry, const in PhysicalMaterial material, inout ReflectedLight reflectedLight ) {\n\treflectedLight.indirectDiffuse += irradiance * BRDF_Diffuse_Lambert( material.diffuseColor );\n}\nvoid RE_IndirectSpecular_Physical( const in vec3 radiance, const in vec3 irradiance, const in vec3 clearcoatRadiance, const in GeometricContext geometry, const in PhysicalMaterial material, inout ReflectedLight reflectedLight) {\n\t#ifdef CLEARCOAT\n\t\tfloat ccDotNV = saturate( dot( geometry.clearcoatNormal, geometry.viewDir ) );\n\t\treflectedLight.indirectSpecular += clearcoatRadiance * material.clearcoat * BRDF_Specular_GGX_Environment( geometry.viewDir, geometry.clearcoatNormal, vec3( DEFAULT_SPECULAR_COEFFICIENT ), material.clearcoatRoughness );\n\t\tfloat ccDotNL = ccDotNV;\n\t\tfloat clearcoatDHR = material.clearcoat * clearcoatDHRApprox( material.clearcoatRoughness, ccDotNL );\n\t#else\n\t\tfloat clearcoatDHR = 0.0;\n\t#endif\n\tfloat clearcoatInv = 1.0 - clearcoatDHR;\n\tvec3 singleScattering = vec3( 0.0 );\n\tvec3 multiScattering = vec3( 0.0 );\n\tvec3 cosineWeightedIrradiance = irradiance * RECIPROCAL_PI;\n\tBRDF_Specular_Multiscattering_Environment( geometry, material.specularColor, material.specularRoughness, singleScattering, multiScattering );\n\tvec3 diffuse = material.diffuseColor * ( 1.0 - ( singleScattering + multiScattering ) );\n\treflectedLight.indirectSpecular += clearcoatInv * radiance * singleScattering;\n\treflectedLight.indirectSpecular += multiScattering * cosineWeightedIrradiance;\n\treflectedLight.indirectDiffuse += diffuse * cosineWeightedIrradiance;\n}\n#define RE_Direct\t\t\t\tRE_Direct_Physical\n#define RE_Direct_RectArea\t\tRE_Direct_RectArea_Physical\n#define RE_IndirectDiffuse\t\tRE_IndirectDiffuse_Physical\n#define RE_IndirectSpecular\t\tRE_IndirectSpecular_Physical\nfloat computeSpecularOcclusion( const in float dotNV, const in float ambientOcclusion, const in float roughness ) {\n\treturn saturate( pow( dotNV + ambientOcclusion, exp2( - 16.0 * roughness - 1.0 ) ) - 1.0 + ambientOcclusion );\n}";

	var lights_fragment_begin = "\nGeometricContext geometry;\ngeometry.position = - vViewPosition;\ngeometry.normal = normal;\ngeometry.viewDir = ( isOrthographic ) ? vec3( 0, 0, 1 ) : normalize( vViewPosition );\n#ifdef CLEARCOAT\n\tgeometry.clearcoatNormal = clearcoatNormal;\n#endif\nIncidentLight directLight;\n#if ( NUM_POINT_LIGHTS > 0 ) && defined( RE_Direct )\n\tPointLight pointLight;\n\t#if defined( USE_SHADOWMAP ) && NUM_POINT_LIGHT_SHADOWS > 0\n\tPointLightShadow pointLightShadow;\n\t#endif\n\t#pragma unroll_loop\n\tfor ( int i = 0; i < NUM_POINT_LIGHTS; i ++ ) {\n\t\tpointLight = pointLights[ i ];\n\t\tgetPointDirectLightIrradiance( pointLight, geometry, directLight );\n\t\t#if defined( USE_SHADOWMAP ) && ( UNROLLED_LOOP_INDEX < NUM_POINT_LIGHT_SHADOWS )\n\t\tpointLightShadow = pointLightShadows[ i ];\n\t\tdirectLight.color *= all( bvec2( directLight.visible, receiveShadow ) ) ? getPointShadow( pointShadowMap[ i ], pointLightShadow.shadowMapSize, pointLightShadow.shadowBias, pointLightShadow.shadowRadius, vPointShadowCoord[ i ], pointLightShadow.shadowCameraNear, pointLightShadow.shadowCameraFar ) : 1.0;\n\t\t#endif\n\t\tRE_Direct( directLight, geometry, material, reflectedLight );\n\t}\n#endif\n#if ( NUM_SPOT_LIGHTS > 0 ) && defined( RE_Direct )\n\tSpotLight spotLight;\n\t#if defined( USE_SHADOWMAP ) && NUM_SPOT_LIGHT_SHADOWS > 0\n\tSpotLightShadow spotLightShadow;\n\t#endif\n\t#pragma unroll_loop\n\tfor ( int i = 0; i < NUM_SPOT_LIGHTS; i ++ ) {\n\t\tspotLight = spotLights[ i ];\n\t\tgetSpotDirectLightIrradiance( spotLight, geometry, directLight );\n\t\t#if defined( USE_SHADOWMAP ) && ( UNROLLED_LOOP_INDEX < NUM_SPOT_LIGHT_SHADOWS )\n\t\tspotLightShadow = spotLightShadows[ i ];\n\t\tdirectLight.color *= all( bvec2( directLight.visible, receiveShadow ) ) ? getShadow( spotShadowMap[ i ], spotLightShadow.shadowMapSize, spotLightShadow.shadowBias, spotLightShadow.shadowRadius, vSpotShadowCoord[ i ] ) : 1.0;\n\t\t#endif\n\t\tRE_Direct( directLight, geometry, material, reflectedLight );\n\t}\n#endif\n#if ( NUM_DIR_LIGHTS > 0 ) && defined( RE_Direct )\n\tDirectionalLight directionalLight;\n\t#if defined( USE_SHADOWMAP ) && NUM_DIR_LIGHT_SHADOWS > 0\n\tDirectionalLightShadow directionalLightShadow;\n\t#endif\n\t#pragma unroll_loop\n\tfor ( int i = 0; i < NUM_DIR_LIGHTS; i ++ ) {\n\t\tdirectionalLight = directionalLights[ i ];\n\t\tgetDirectionalDirectLightIrradiance( directionalLight, geometry, directLight );\n\t\t#if defined( USE_SHADOWMAP ) && ( UNROLLED_LOOP_INDEX < NUM_DIR_LIGHT_SHADOWS )\n\t\tdirectionalLightShadow = directionalLightShadows[ i ];\n\t\tdirectLight.color *= all( bvec2( directLight.visible, receiveShadow ) ) ? getShadow( directionalShadowMap[ i ], directionalLightShadow.shadowMapSize, directionalLightShadow.shadowBias, directionalLightShadow.shadowRadius, vDirectionalShadowCoord[ i ] ) : 1.0;\n\t\t#endif\n\t\tRE_Direct( directLight, geometry, material, reflectedLight );\n\t}\n#endif\n#if ( NUM_RECT_AREA_LIGHTS > 0 ) && defined( RE_Direct_RectArea )\n\tRectAreaLight rectAreaLight;\n\t#pragma unroll_loop\n\tfor ( int i = 0; i < NUM_RECT_AREA_LIGHTS; i ++ ) {\n\t\trectAreaLight = rectAreaLights[ i ];\n\t\tRE_Direct_RectArea( rectAreaLight, geometry, material, reflectedLight );\n\t}\n#endif\n#if defined( RE_IndirectDiffuse )\n\tvec3 iblIrradiance = vec3( 0.0 );\n\tvec3 irradiance = getAmbientLightIrradiance( ambientLightColor );\n\tirradiance += getLightProbeIrradiance( lightProbe, geometry );\n\t#if ( NUM_HEMI_LIGHTS > 0 )\n\t\t#pragma unroll_loop\n\t\tfor ( int i = 0; i < NUM_HEMI_LIGHTS; i ++ ) {\n\t\t\tirradiance += getHemisphereLightIrradiance( hemisphereLights[ i ], geometry );\n\t\t}\n\t#endif\n#endif\n#if defined( RE_IndirectSpecular )\n\tvec3 radiance = vec3( 0.0 );\n\tvec3 clearcoatRadiance = vec3( 0.0 );\n#endif";

	var lights_fragment_maps = "#if defined( RE_IndirectDiffuse )\n\t#ifdef USE_LIGHTMAP\n\t\tvec4 lightMapTexel= texture2D( lightMap, vUv2 );\n\t\tvec3 lightMapIrradiance = lightMapTexelToLinear( lightMapTexel ).rgb * lightMapIntensity;\n\t\t#ifndef PHYSICALLY_CORRECT_LIGHTS\n\t\t\tlightMapIrradiance *= PI;\n\t\t#endif\n\t\tirradiance += lightMapIrradiance;\n\t#endif\n\t#if defined( USE_ENVMAP ) && defined( STANDARD ) && defined( ENVMAP_TYPE_CUBE_UV )\n\t\tiblIrradiance += getLightProbeIndirectIrradiance( geometry, maxMipLevel );\n\t#endif\n#endif\n#if defined( USE_ENVMAP ) && defined( RE_IndirectSpecular )\n\tradiance += getLightProbeIndirectRadiance( geometry.viewDir, geometry.normal, material.specularRoughness, maxMipLevel );\n\t#ifdef CLEARCOAT\n\t\tclearcoatRadiance += getLightProbeIndirectRadiance( geometry.viewDir, geometry.clearcoatNormal, material.clearcoatRoughness, maxMipLevel );\n\t#endif\n#endif";

	var lights_fragment_end = "#if defined( RE_IndirectDiffuse )\n\tRE_IndirectDiffuse( irradiance, geometry, material, reflectedLight );\n#endif\n#if defined( RE_IndirectSpecular )\n\tRE_IndirectSpecular( radiance, iblIrradiance, clearcoatRadiance, geometry, material, reflectedLight );\n#endif";

	var logdepthbuf_fragment = "#if defined( USE_LOGDEPTHBUF ) && defined( USE_LOGDEPTHBUF_EXT )\n\tgl_FragDepthEXT = vIsPerspective == 0.0 ? gl_FragCoord.z : log2( vFragDepth ) * logDepthBufFC * 0.5;\n#endif";

	var logdepthbuf_pars_fragment = "#if defined( USE_LOGDEPTHBUF ) && defined( USE_LOGDEPTHBUF_EXT )\n\tuniform float logDepthBufFC;\n\tvarying float vFragDepth;\n\tvarying float vIsPerspective;\n#endif";

	var logdepthbuf_pars_vertex = "#ifdef USE_LOGDEPTHBUF\n\t#ifdef USE_LOGDEPTHBUF_EXT\n\t\tvarying float vFragDepth;\n\t\tvarying float vIsPerspective;\n\t#else\n\t\tuniform float logDepthBufFC;\n\t#endif\n#endif";

	var logdepthbuf_vertex = "#ifdef USE_LOGDEPTHBUF\n\t#ifdef USE_LOGDEPTHBUF_EXT\n\t\tvFragDepth = 1.0 + gl_Position.w;\n\t\tvIsPerspective = float( isPerspectiveMatrix( projectionMatrix ) );\n\t#else\n\t\tif ( isPerspectiveMatrix( projectionMatrix ) ) {\n\t\t\tgl_Position.z = log2( max( EPSILON, gl_Position.w + 1.0 ) ) * logDepthBufFC - 1.0;\n\t\t\tgl_Position.z *= gl_Position.w;\n\t\t}\n\t#endif\n#endif";

	var map_fragment = "#ifdef USE_MAP\n\tvec4 texelColor = texture2D( map, vUv );\n\ttexelColor = mapTexelToLinear( texelColor );\n\tdiffuseColor *= texelColor;\n#endif";

	var map_pars_fragment = "#ifdef USE_MAP\n\tuniform sampler2D map;\n#endif";

	var map_particle_fragment = "#if defined( USE_MAP ) || defined( USE_ALPHAMAP )\n\tvec2 uv = ( uvTransform * vec3( gl_PointCoord.x, 1.0 - gl_PointCoord.y, 1 ) ).xy;\n#endif\n#ifdef USE_MAP\n\tvec4 mapTexel = texture2D( map, uv );\n\tdiffuseColor *= mapTexelToLinear( mapTexel );\n#endif\n#ifdef USE_ALPHAMAP\n\tdiffuseColor.a *= texture2D( alphaMap, uv ).g;\n#endif";

	var map_particle_pars_fragment = "#if defined( USE_MAP ) || defined( USE_ALPHAMAP )\n\tuniform mat3 uvTransform;\n#endif\n#ifdef USE_MAP\n\tuniform sampler2D map;\n#endif\n#ifdef USE_ALPHAMAP\n\tuniform sampler2D alphaMap;\n#endif";

	var metalnessmap_fragment = "float metalnessFactor = metalness;\n#ifdef USE_METALNESSMAP\n\tvec4 texelMetalness = texture2D( metalnessMap, vUv );\n\tmetalnessFactor *= texelMetalness.b;\n#endif";

	var metalnessmap_pars_fragment = "#ifdef USE_METALNESSMAP\n\tuniform sampler2D metalnessMap;\n#endif";

	var morphnormal_vertex = "#ifdef USE_MORPHNORMALS\n\tobjectNormal *= morphTargetBaseInfluence;\n\tobjectNormal += morphNormal0 * morphTargetInfluences[ 0 ];\n\tobjectNormal += morphNormal1 * morphTargetInfluences[ 1 ];\n\tobjectNormal += morphNormal2 * morphTargetInfluences[ 2 ];\n\tobjectNormal += morphNormal3 * morphTargetInfluences[ 3 ];\n#endif";

	var morphtarget_pars_vertex = "#ifdef USE_MORPHTARGETS\n\tuniform float morphTargetBaseInfluence;\n\t#ifndef USE_MORPHNORMALS\n\tuniform float morphTargetInfluences[ 8 ];\n\t#else\n\tuniform float morphTargetInfluences[ 4 ];\n\t#endif\n#endif";

	var morphtarget_vertex = "#ifdef USE_MORPHTARGETS\n\ttransformed *= morphTargetBaseInfluence;\n\ttransformed += morphTarget0 * morphTargetInfluences[ 0 ];\n\ttransformed += morphTarget1 * morphTargetInfluences[ 1 ];\n\ttransformed += morphTarget2 * morphTargetInfluences[ 2 ];\n\ttransformed += morphTarget3 * morphTargetInfluences[ 3 ];\n\t#ifndef USE_MORPHNORMALS\n\ttransformed += morphTarget4 * morphTargetInfluences[ 4 ];\n\ttransformed += morphTarget5 * morphTargetInfluences[ 5 ];\n\ttransformed += morphTarget6 * morphTargetInfluences[ 6 ];\n\ttransformed += morphTarget7 * morphTargetInfluences[ 7 ];\n\t#endif\n#endif";

	var normal_fragment_begin = "#ifdef FLAT_SHADED\n\tvec3 fdx = vec3( dFdx( vViewPosition.x ), dFdx( vViewPosition.y ), dFdx( vViewPosition.z ) );\n\tvec3 fdy = vec3( dFdy( vViewPosition.x ), dFdy( vViewPosition.y ), dFdy( vViewPosition.z ) );\n\tvec3 normal = normalize( cross( fdx, fdy ) );\n#else\n\tvec3 normal = normalize( vNormal );\n\t#ifdef DOUBLE_SIDED\n\t\tnormal = normal * ( float( gl_FrontFacing ) * 2.0 - 1.0 );\n\t#endif\n\t#ifdef USE_TANGENT\n\t\tvec3 tangent = normalize( vTangent );\n\t\tvec3 bitangent = normalize( vBitangent );\n\t\t#ifdef DOUBLE_SIDED\n\t\t\ttangent = tangent * ( float( gl_FrontFacing ) * 2.0 - 1.0 );\n\t\t\tbitangent = bitangent * ( float( gl_FrontFacing ) * 2.0 - 1.0 );\n\t\t#endif\n\t\t#if defined( TANGENTSPACE_NORMALMAP ) || defined( USE_CLEARCOAT_NORMALMAP )\n\t\t\tmat3 vTBN = mat3( tangent, bitangent, normal );\n\t\t#endif\n\t#endif\n#endif\nvec3 geometryNormal = normal;";

	var normal_fragment_maps = "#ifdef OBJECTSPACE_NORMALMAP\n\tnormal = texture2D( normalMap, vUv ).xyz * 2.0 - 1.0;\n\t#ifdef FLIP_SIDED\n\t\tnormal = - normal;\n\t#endif\n\t#ifdef DOUBLE_SIDED\n\t\tnormal = normal * ( float( gl_FrontFacing ) * 2.0 - 1.0 );\n\t#endif\n\tnormal = normalize( normalMatrix * normal );\n#elif defined( TANGENTSPACE_NORMALMAP )\n\tvec3 mapN = texture2D( normalMap, vUv ).xyz * 2.0 - 1.0;\n\tmapN.xy *= normalScale;\n\t#ifdef USE_TANGENT\n\t\tnormal = normalize( vTBN * mapN );\n\t#else\n\t\tnormal = perturbNormal2Arb( -vViewPosition, normal, mapN );\n\t#endif\n#elif defined( USE_BUMPMAP )\n\tnormal = perturbNormalArb( -vViewPosition, normal, dHdxy_fwd() );\n#endif";

	var normalmap_pars_fragment = "#ifdef USE_NORMALMAP\n\tuniform sampler2D normalMap;\n\tuniform vec2 normalScale;\n#endif\n#ifdef OBJECTSPACE_NORMALMAP\n\tuniform mat3 normalMatrix;\n#endif\n#if ! defined ( USE_TANGENT ) && ( defined ( TANGENTSPACE_NORMALMAP ) || defined ( USE_CLEARCOAT_NORMALMAP ) )\n\tvec3 perturbNormal2Arb( vec3 eye_pos, vec3 surf_norm, vec3 mapN ) {\n\t\tvec3 q0 = vec3( dFdx( eye_pos.x ), dFdx( eye_pos.y ), dFdx( eye_pos.z ) );\n\t\tvec3 q1 = vec3( dFdy( eye_pos.x ), dFdy( eye_pos.y ), dFdy( eye_pos.z ) );\n\t\tvec2 st0 = dFdx( vUv.st );\n\t\tvec2 st1 = dFdy( vUv.st );\n\t\tfloat scale = sign( st1.t * st0.s - st0.t * st1.s );\n\t\tvec3 S = normalize( ( q0 * st1.t - q1 * st0.t ) * scale );\n\t\tvec3 T = normalize( ( - q0 * st1.s + q1 * st0.s ) * scale );\n\t\tvec3 N = normalize( surf_norm );\n\t\tmat3 tsn = mat3( S, T, N );\n\t\tmapN.xy *= ( float( gl_FrontFacing ) * 2.0 - 1.0 );\n\t\treturn normalize( tsn * mapN );\n\t}\n#endif";

	var clearcoat_normal_fragment_begin = "#ifdef CLEARCOAT\n\tvec3 clearcoatNormal = geometryNormal;\n#endif";

	var clearcoat_normal_fragment_maps = "#ifdef USE_CLEARCOAT_NORMALMAP\n\tvec3 clearcoatMapN = texture2D( clearcoatNormalMap, vUv ).xyz * 2.0 - 1.0;\n\tclearcoatMapN.xy *= clearcoatNormalScale;\n\t#ifdef USE_TANGENT\n\t\tclearcoatNormal = normalize( vTBN * clearcoatMapN );\n\t#else\n\t\tclearcoatNormal = perturbNormal2Arb( - vViewPosition, clearcoatNormal, clearcoatMapN );\n\t#endif\n#endif";

	var clearcoat_normalmap_pars_fragment = "#ifdef USE_CLEARCOAT_NORMALMAP\n\tuniform sampler2D clearcoatNormalMap;\n\tuniform vec2 clearcoatNormalScale;\n#endif";

	var packing = "vec3 packNormalToRGB( const in vec3 normal ) {\n\treturn normalize( normal ) * 0.5 + 0.5;\n}\nvec3 unpackRGBToNormal( const in vec3 rgb ) {\n\treturn 2.0 * rgb.xyz - 1.0;\n}\nconst float PackUpscale = 256. / 255.;const float UnpackDownscale = 255. / 256.;\nconst vec3 PackFactors = vec3( 256. * 256. * 256., 256. * 256.,  256. );\nconst vec4 UnpackFactors = UnpackDownscale / vec4( PackFactors, 1. );\nconst float ShiftRight8 = 1. / 256.;\nvec4 packDepthToRGBA( const in float v ) {\n\tvec4 r = vec4( fract( v * PackFactors ), v );\n\tr.yzw -= r.xyz * ShiftRight8;\treturn r * PackUpscale;\n}\nfloat unpackRGBAToDepth( const in vec4 v ) {\n\treturn dot( v, UnpackFactors );\n}\nvec4 pack2HalfToRGBA( vec2 v ) {\n\tvec4 r = vec4( v.x, fract( v.x * 255.0 ), v.y, fract( v.y * 255.0 ));\n\treturn vec4( r.x - r.y / 255.0, r.y, r.z - r.w / 255.0, r.w);\n}\nvec2 unpackRGBATo2Half( vec4 v ) {\n\treturn vec2( v.x + ( v.y / 255.0 ), v.z + ( v.w / 255.0 ) );\n}\nfloat viewZToOrthographicDepth( const in float viewZ, const in float near, const in float far ) {\n\treturn ( viewZ + near ) / ( near - far );\n}\nfloat orthographicDepthToViewZ( const in float linearClipZ, const in float near, const in float far ) {\n\treturn linearClipZ * ( near - far ) - near;\n}\nfloat viewZToPerspectiveDepth( const in float viewZ, const in float near, const in float far ) {\n\treturn (( near + viewZ ) * far ) / (( far - near ) * viewZ );\n}\nfloat perspectiveDepthToViewZ( const in float invClipZ, const in float near, const in float far ) {\n\treturn ( near * far ) / ( ( far - near ) * invClipZ - far );\n}";

	var premultiplied_alpha_fragment = "#ifdef PREMULTIPLIED_ALPHA\n\tgl_FragColor.rgb *= gl_FragColor.a;\n#endif";

	var project_vertex = "vec4 mvPosition = vec4( transformed, 1.0 );\n#ifdef USE_INSTANCING\n\tmvPosition = instanceMatrix * mvPosition;\n#endif\nmvPosition = modelViewMatrix * mvPosition;\ngl_Position = projectionMatrix * mvPosition;";

	var dithering_fragment = "#ifdef DITHERING\n\tgl_FragColor.rgb = dithering( gl_FragColor.rgb );\n#endif";

	var dithering_pars_fragment = "#ifdef DITHERING\n\tvec3 dithering( vec3 color ) {\n\t\tfloat grid_position = rand( gl_FragCoord.xy );\n\t\tvec3 dither_shift_RGB = vec3( 0.25 / 255.0, -0.25 / 255.0, 0.25 / 255.0 );\n\t\tdither_shift_RGB = mix( 2.0 * dither_shift_RGB, -2.0 * dither_shift_RGB, grid_position );\n\t\treturn color + dither_shift_RGB;\n\t}\n#endif";

	var roughnessmap_fragment = "float roughnessFactor = roughness;\n#ifdef USE_ROUGHNESSMAP\n\tvec4 texelRoughness = texture2D( roughnessMap, vUv );\n\troughnessFactor *= texelRoughness.g;\n#endif";

	var roughnessmap_pars_fragment = "#ifdef USE_ROUGHNESSMAP\n\tuniform sampler2D roughnessMap;\n#endif";

	var shadowmap_pars_fragment = "#ifdef USE_SHADOWMAP\n\t#if NUM_DIR_LIGHT_SHADOWS > 0\n\t\tuniform sampler2D directionalShadowMap[ NUM_DIR_LIGHT_SHADOWS ];\n\t\tvarying vec4 vDirectionalShadowCoord[ NUM_DIR_LIGHT_SHADOWS ];\n\t#endif\n\t#if NUM_SPOT_LIGHT_SHADOWS > 0\n\t\tuniform sampler2D spotShadowMap[ NUM_SPOT_LIGHT_SHADOWS ];\n\t\tvarying vec4 vSpotShadowCoord[ NUM_SPOT_LIGHT_SHADOWS ];\n\t#endif\n\t#if NUM_POINT_LIGHT_SHADOWS > 0\n\t\tuniform sampler2D pointShadowMap[ NUM_POINT_LIGHT_SHADOWS ];\n\t\tvarying vec4 vPointShadowCoord[ NUM_POINT_LIGHT_SHADOWS ];\n\t#endif\n\tfloat texture2DCompare( sampler2D depths, vec2 uv, float compare ) {\n\t\treturn step( compare, unpackRGBAToDepth( texture2D( depths, uv ) ) );\n\t}\n\tvec2 texture2DDistribution( sampler2D shadow, vec2 uv ) {\n\t\treturn unpackRGBATo2Half( texture2D( shadow, uv ) );\n\t}\n\tfloat VSMShadow (sampler2D shadow, vec2 uv, float compare ){\n\t\tfloat occlusion = 1.0;\n\t\tvec2 distribution = texture2DDistribution( shadow, uv );\n\t\tfloat hard_shadow = step( compare , distribution.x );\n\t\tif (hard_shadow != 1.0 ) {\n\t\t\tfloat distance = compare - distribution.x ;\n\t\t\tfloat variance = max( 0.00000, distribution.y * distribution.y );\n\t\t\tfloat softness_probability = variance / (variance + distance * distance );\t\t\tsoftness_probability = clamp( ( softness_probability - 0.3 ) / ( 0.95 - 0.3 ), 0.0, 1.0 );\t\t\tocclusion = clamp( max( hard_shadow, softness_probability ), 0.0, 1.0 );\n\t\t}\n\t\treturn occlusion;\n\t}\n\tfloat getShadow( sampler2D shadowMap, vec2 shadowMapSize, float shadowBias, float shadowRadius, vec4 shadowCoord ) {\n\t\tfloat shadow = 1.0;\n\t\tshadowCoord.xyz /= shadowCoord.w;\n\t\tshadowCoord.z += shadowBias;\n\t\tbvec4 inFrustumVec = bvec4 ( shadowCoord.x >= 0.0, shadowCoord.x <= 1.0, shadowCoord.y >= 0.0, shadowCoord.y <= 1.0 );\n\t\tbool inFrustum = all( inFrustumVec );\n\t\tbvec2 frustumTestVec = bvec2( inFrustum, shadowCoord.z <= 1.0 );\n\t\tbool frustumTest = all( frustumTestVec );\n\t\tif ( frustumTest ) {\n\t\t#if defined( SHADOWMAP_TYPE_PCF )\n\t\t\tvec2 texelSize = vec2( 1.0 ) / shadowMapSize;\n\t\t\tfloat dx0 = - texelSize.x * shadowRadius;\n\t\t\tfloat dy0 = - texelSize.y * shadowRadius;\n\t\t\tfloat dx1 = + texelSize.x * shadowRadius;\n\t\t\tfloat dy1 = + texelSize.y * shadowRadius;\n\t\t\tfloat dx2 = dx0 / 2.0;\n\t\t\tfloat dy2 = dy0 / 2.0;\n\t\t\tfloat dx3 = dx1 / 2.0;\n\t\t\tfloat dy3 = dy1 / 2.0;\n\t\t\tshadow = (\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx0, dy0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( 0.0, dy0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx1, dy0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx2, dy2 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( 0.0, dy2 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx3, dy2 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx0, 0.0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx2, 0.0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy, shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx3, 0.0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx1, 0.0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx2, dy3 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( 0.0, dy3 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx3, dy3 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx0, dy1 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( 0.0, dy1 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx1, dy1 ), shadowCoord.z )\n\t\t\t) * ( 1.0 / 17.0 );\n\t\t#elif defined( SHADOWMAP_TYPE_PCF_SOFT )\n\t\t\tvec2 texelSize = vec2( 1.0 ) / shadowMapSize;\n\t\t\tfloat dx = texelSize.x;\n\t\t\tfloat dy = texelSize.y;\n\t\t\tvec2 uv = shadowCoord.xy;\n\t\t\tvec2 f = fract( uv * shadowMapSize + 0.5 );\n\t\t\tuv -= f * texelSize;\n\t\t\tshadow = (\n\t\t\t\ttexture2DCompare( shadowMap, uv, shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, uv + vec2( dx, 0.0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, uv + vec2( 0.0, dy ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, uv + texelSize, shadowCoord.z ) +\n\t\t\t\tmix( texture2DCompare( shadowMap, uv + vec2( -dx, 0.0 ), shadowCoord.z ), \n\t\t\t\t\t texture2DCompare( shadowMap, uv + vec2( 2.0 * dx, 0.0 ), shadowCoord.z ),\n\t\t\t\t\t f.x ) +\n\t\t\t\tmix( texture2DCompare( shadowMap, uv + vec2( -dx, dy ), shadowCoord.z ), \n\t\t\t\t\t texture2DCompare( shadowMap, uv + vec2( 2.0 * dx, dy ), shadowCoord.z ),\n\t\t\t\t\t f.x ) +\n\t\t\t\tmix( texture2DCompare( shadowMap, uv + vec2( 0.0, -dy ), shadowCoord.z ), \n\t\t\t\t\t texture2DCompare( shadowMap, uv + vec2( 0.0, 2.0 * dy ), shadowCoord.z ),\n\t\t\t\t\t f.y ) +\n\t\t\t\tmix( texture2DCompare( shadowMap, uv + vec2( dx, -dy ), shadowCoord.z ), \n\t\t\t\t\t texture2DCompare( shadowMap, uv + vec2( dx, 2.0 * dy ), shadowCoord.z ),\n\t\t\t\t\t f.y ) +\n\t\t\t\tmix( mix( texture2DCompare( shadowMap, uv + vec2( -dx, -dy ), shadowCoord.z ), \n\t\t\t\t\t\t  texture2DCompare( shadowMap, uv + vec2( 2.0 * dx, -dy ), shadowCoord.z ),\n\t\t\t\t\t\t  f.x ),\n\t\t\t\t\t mix( texture2DCompare( shadowMap, uv + vec2( -dx, 2.0 * dy ), shadowCoord.z ), \n\t\t\t\t\t\t  texture2DCompare( shadowMap, uv + + vec2( 2.0 * dx, 2.0 * dy ), shadowCoord.z ),\n\t\t\t\t\t\t  f.x ),\n\t\t\t\t\t f.y )\n\t\t\t) * ( 1.0 / 9.0 );\n\t\t#elif defined( SHADOWMAP_TYPE_VSM )\n\t\t\tshadow = VSMShadow( shadowMap, shadowCoord.xy, shadowCoord.z );\n\t\t#else\n\t\t\tshadow = texture2DCompare( shadowMap, shadowCoord.xy, shadowCoord.z );\n\t\t#endif\n\t\t}\n\t\treturn shadow;\n\t}\n\tvec2 cubeToUV( vec3 v, float texelSizeY ) {\n\t\tvec3 absV = abs( v );\n\t\tfloat scaleToCube = 1.0 / max( absV.x, max( absV.y, absV.z ) );\n\t\tabsV *= scaleToCube;\n\t\tv *= scaleToCube * ( 1.0 - 2.0 * texelSizeY );\n\t\tvec2 planar = v.xy;\n\t\tfloat almostATexel = 1.5 * texelSizeY;\n\t\tfloat almostOne = 1.0 - almostATexel;\n\t\tif ( absV.z >= almostOne ) {\n\t\t\tif ( v.z > 0.0 )\n\t\t\t\tplanar.x = 4.0 - v.x;\n\t\t} else if ( absV.x >= almostOne ) {\n\t\t\tfloat signX = sign( v.x );\n\t\t\tplanar.x = v.z * signX + 2.0 * signX;\n\t\t} else if ( absV.y >= almostOne ) {\n\t\t\tfloat signY = sign( v.y );\n\t\t\tplanar.x = v.x + 2.0 * signY + 2.0;\n\t\t\tplanar.y = v.z * signY - 2.0;\n\t\t}\n\t\treturn vec2( 0.125, 0.25 ) * planar + vec2( 0.375, 0.75 );\n\t}\n\tfloat getPointShadow( sampler2D shadowMap, vec2 shadowMapSize, float shadowBias, float shadowRadius, vec4 shadowCoord, float shadowCameraNear, float shadowCameraFar ) {\n\t\tvec2 texelSize = vec2( 1.0 ) / ( shadowMapSize * vec2( 4.0, 2.0 ) );\n\t\tvec3 lightToPosition = shadowCoord.xyz;\n\t\tfloat dp = ( length( lightToPosition ) - shadowCameraNear ) / ( shadowCameraFar - shadowCameraNear );\t\tdp += shadowBias;\n\t\tvec3 bd3D = normalize( lightToPosition );\n\t\t#if defined( SHADOWMAP_TYPE_PCF ) || defined( SHADOWMAP_TYPE_PCF_SOFT ) || defined( SHADOWMAP_TYPE_VSM )\n\t\t\tvec2 offset = vec2( - 1, 1 ) * shadowRadius * texelSize.y;\n\t\t\treturn (\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D + offset.xyy, texelSize.y ), dp ) +\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D + offset.yyy, texelSize.y ), dp ) +\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D + offset.xyx, texelSize.y ), dp ) +\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D + offset.yyx, texelSize.y ), dp ) +\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D, texelSize.y ), dp ) +\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D + offset.xxy, texelSize.y ), dp ) +\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D + offset.yxy, texelSize.y ), dp ) +\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D + offset.xxx, texelSize.y ), dp ) +\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D + offset.yxx, texelSize.y ), dp )\n\t\t\t) * ( 1.0 / 9.0 );\n\t\t#else\n\t\t\treturn texture2DCompare( shadowMap, cubeToUV( bd3D, texelSize.y ), dp );\n\t\t#endif\n\t}\n#endif";

	var shadowmap_pars_vertex = "#ifdef USE_SHADOWMAP\n\t#if NUM_DIR_LIGHT_SHADOWS > 0\n\t\tuniform mat4 directionalShadowMatrix[ NUM_DIR_LIGHT_SHADOWS ];\n\t\tvarying vec4 vDirectionalShadowCoord[ NUM_DIR_LIGHT_SHADOWS ];\n\t#endif\n\t#if NUM_SPOT_LIGHT_SHADOWS > 0\n\t\tuniform mat4 spotShadowMatrix[ NUM_SPOT_LIGHT_SHADOWS ];\n\t\tvarying vec4 vSpotShadowCoord[ NUM_SPOT_LIGHT_SHADOWS ];\n\t#endif\n\t#if NUM_POINT_LIGHT_SHADOWS > 0\n\t\tuniform mat4 pointShadowMatrix[ NUM_POINT_LIGHT_SHADOWS ];\n\t\tvarying vec4 vPointShadowCoord[ NUM_POINT_LIGHT_SHADOWS ];\n\t#endif\n#endif";

	var shadowmap_vertex = "#ifdef USE_SHADOWMAP\n\t#if NUM_DIR_LIGHT_SHADOWS > 0\n\t#pragma unroll_loop\n\tfor ( int i = 0; i < NUM_DIR_LIGHT_SHADOWS; i ++ ) {\n\t\tvDirectionalShadowCoord[ i ] = directionalShadowMatrix[ i ] * worldPosition;\n\t}\n\t#endif\n\t#if NUM_SPOT_LIGHT_SHADOWS > 0\n\t#pragma unroll_loop\n\tfor ( int i = 0; i < NUM_SPOT_LIGHT_SHADOWS; i ++ ) {\n\t\tvSpotShadowCoord[ i ] = spotShadowMatrix[ i ] * worldPosition;\n\t}\n\t#endif\n\t#if NUM_POINT_LIGHT_SHADOWS > 0\n\t#pragma unroll_loop\n\tfor ( int i = 0; i < NUM_POINT_LIGHT_SHADOWS; i ++ ) {\n\t\tvPointShadowCoord[ i ] = pointShadowMatrix[ i ] * worldPosition;\n\t}\n\t#endif\n#endif";

	var shadowmask_pars_fragment = "float getShadowMask() {\n\tfloat shadow = 1.0;\n\t#ifdef USE_SHADOWMAP\n\t#if NUM_DIR_LIGHT_SHADOWS > 0\n\tDirectionalLightShadow directionalLight;\n\t#pragma unroll_loop\n\tfor ( int i = 0; i < NUM_DIR_LIGHT_SHADOWS; i ++ ) {\n\t\tdirectionalLight = directionalLightShadows[ i ];\n\t\tshadow *= receiveShadow ? getShadow( directionalShadowMap[ i ], directionalLight.shadowMapSize, directionalLight.shadowBias, directionalLight.shadowRadius, vDirectionalShadowCoord[ i ] ) : 1.0;\n\t}\n\t#endif\n\t#if NUM_SPOT_LIGHT_SHADOWS > 0\n\tSpotLightShadow spotLight;\n\t#pragma unroll_loop\n\tfor ( int i = 0; i < NUM_SPOT_LIGHT_SHADOWS; i ++ ) {\n\t\tspotLight = spotLightShadows[ i ];\n\t\tshadow *= receiveShadow ? getShadow( spotShadowMap[ i ], spotLight.shadowMapSize, spotLight.shadowBias, spotLight.shadowRadius, vSpotShadowCoord[ i ] ) : 1.0;\n\t}\n\t#endif\n\t#if NUM_POINT_LIGHT_SHADOWS > 0\n\tPointLightShadow pointLight;\n\t#pragma unroll_loop\n\tfor ( int i = 0; i < NUM_POINT_LIGHT_SHADOWS; i ++ ) {\n\t\tpointLight = pointLightShadows[ i ];\n\t\tshadow *= receiveShadow ? getPointShadow( pointShadowMap[ i ], pointLight.shadowMapSize, pointLight.shadowBias, pointLight.shadowRadius, vPointShadowCoord[ i ], pointLight.shadowCameraNear, pointLight.shadowCameraFar ) : 1.0;\n\t}\n\t#endif\n\t#endif\n\treturn shadow;\n}";

	var skinbase_vertex = "#ifdef USE_SKINNING\n\tmat4 boneMatX = getBoneMatrix( skinIndex.x );\n\tmat4 boneMatY = getBoneMatrix( skinIndex.y );\n\tmat4 boneMatZ = getBoneMatrix( skinIndex.z );\n\tmat4 boneMatW = getBoneMatrix( skinIndex.w );\n#endif";

	var skinning_pars_vertex = "#ifdef USE_SKINNING\n\tuniform mat4 bindMatrix;\n\tuniform mat4 bindMatrixInverse;\n\t#ifdef BONE_TEXTURE\n\t\tuniform highp sampler2D boneTexture;\n\t\tuniform int boneTextureSize;\n\t\tmat4 getBoneMatrix( const in float i ) {\n\t\t\tfloat j = i * 4.0;\n\t\t\tfloat x = mod( j, float( boneTextureSize ) );\n\t\t\tfloat y = floor( j / float( boneTextureSize ) );\n\t\t\tfloat dx = 1.0 / float( boneTextureSize );\n\t\t\tfloat dy = 1.0 / float( boneTextureSize );\n\t\t\ty = dy * ( y + 0.5 );\n\t\t\tvec4 v1 = texture2D( boneTexture, vec2( dx * ( x + 0.5 ), y ) );\n\t\t\tvec4 v2 = texture2D( boneTexture, vec2( dx * ( x + 1.5 ), y ) );\n\t\t\tvec4 v3 = texture2D( boneTexture, vec2( dx * ( x + 2.5 ), y ) );\n\t\t\tvec4 v4 = texture2D( boneTexture, vec2( dx * ( x + 3.5 ), y ) );\n\t\t\tmat4 bone = mat4( v1, v2, v3, v4 );\n\t\t\treturn bone;\n\t\t}\n\t#else\n\t\tuniform mat4 boneMatrices[ MAX_BONES ];\n\t\tmat4 getBoneMatrix( const in float i ) {\n\t\t\tmat4 bone = boneMatrices[ int(i) ];\n\t\t\treturn bone;\n\t\t}\n\t#endif\n#endif";

	var skinning_vertex = "#ifdef USE_SKINNING\n\tvec4 skinVertex = bindMatrix * vec4( transformed, 1.0 );\n\tvec4 skinned = vec4( 0.0 );\n\tskinned += boneMatX * skinVertex * skinWeight.x;\n\tskinned += boneMatY * skinVertex * skinWeight.y;\n\tskinned += boneMatZ * skinVertex * skinWeight.z;\n\tskinned += boneMatW * skinVertex * skinWeight.w;\n\ttransformed = ( bindMatrixInverse * skinned ).xyz;\n#endif";

	var skinnormal_vertex = "#ifdef USE_SKINNING\n\tmat4 skinMatrix = mat4( 0.0 );\n\tskinMatrix += skinWeight.x * boneMatX;\n\tskinMatrix += skinWeight.y * boneMatY;\n\tskinMatrix += skinWeight.z * boneMatZ;\n\tskinMatrix += skinWeight.w * boneMatW;\n\tskinMatrix  = bindMatrixInverse * skinMatrix * bindMatrix;\n\tobjectNormal = vec4( skinMatrix * vec4( objectNormal, 0.0 ) ).xyz;\n\t#ifdef USE_TANGENT\n\t\tobjectTangent = vec4( skinMatrix * vec4( objectTangent, 0.0 ) ).xyz;\n\t#endif\n#endif";

	var specularmap_fragment = "float specularStrength;\n#ifdef USE_SPECULARMAP\n\tvec4 texelSpecular = texture2D( specularMap, vUv );\n\tspecularStrength = texelSpecular.r;\n#else\n\tspecularStrength = 1.0;\n#endif";

	var specularmap_pars_fragment = "#ifdef USE_SPECULARMAP\n\tuniform sampler2D specularMap;\n#endif";

	var transparent_fragment = "#ifndef TRANSPARENT\n\tdiffuseColor.a = 1.0;\n#endif";

	var tonemapping_fragment = "#if defined( TONE_MAPPING )\n\tgl_FragColor.rgb = toneMapping( gl_FragColor.rgb );\n#endif";

	var tonemapping_pars_fragment = "#ifndef saturate\n#define saturate(a) clamp( a, 0.0, 1.0 )\n#endif\nuniform float toneMappingExposure;\nuniform float toneMappingWhitePoint;\nvec3 LinearToneMapping( vec3 color ) {\n\treturn toneMappingExposure * color;\n}\nvec3 ReinhardToneMapping( vec3 color ) {\n\tcolor *= toneMappingExposure;\n\treturn saturate( color / ( vec3( 1.0 ) + color ) );\n}\n#define Uncharted2Helper( x ) max( ( ( x * ( 0.15 * x + 0.10 * 0.50 ) + 0.20 * 0.02 ) / ( x * ( 0.15 * x + 0.50 ) + 0.20 * 0.30 ) ) - 0.02 / 0.30, vec3( 0.0 ) )\nvec3 Uncharted2ToneMapping( vec3 color ) {\n\tcolor *= toneMappingExposure;\n\treturn saturate( Uncharted2Helper( color ) / Uncharted2Helper( vec3( toneMappingWhitePoint ) ) );\n}\nvec3 OptimizedCineonToneMapping( vec3 color ) {\n\tcolor *= toneMappingExposure;\n\tcolor = max( vec3( 0.0 ), color - 0.004 );\n\treturn pow( ( color * ( 6.2 * color + 0.5 ) ) / ( color * ( 6.2 * color + 1.7 ) + 0.06 ), vec3( 2.2 ) );\n}\nvec3 ACESFilmicToneMapping( vec3 color ) {\n\tcolor *= toneMappingExposure;\n\treturn saturate( ( color * ( 2.51 * color + 0.03 ) ) / ( color * ( 2.43 * color + 0.59 ) + 0.14 ) );\n}";

	var uv_pars_fragment = "#if ( defined( USE_UV ) && ! defined( UVS_VERTEX_ONLY ) )\n\tvarying vec2 vUv;\n#endif";

	var uv_pars_vertex = "#ifdef USE_UV\n\t#ifdef UVS_VERTEX_ONLY\n\t\tvec2 vUv;\n\t#else\n\t\tvarying vec2 vUv;\n\t#endif\n\tuniform mat3 uvTransform;\n#endif";

	var uv_vertex = "#ifdef USE_UV\n\tvUv = ( uvTransform * vec3( uv, 1 ) ).xy;\n#endif";

	var uv2_pars_fragment = "#if defined( USE_LIGHTMAP ) || defined( USE_AOMAP )\n\tvarying vec2 vUv2;\n#endif";

	var uv2_pars_vertex = "#if defined( USE_LIGHTMAP ) || defined( USE_AOMAP )\n\tattribute vec2 uv2;\n\tvarying vec2 vUv2;\n\tuniform mat3 uv2Transform;\n#endif";

	var uv2_vertex = "#if defined( USE_LIGHTMAP ) || defined( USE_AOMAP )\n\tvUv2 = ( uv2Transform * vec3( uv2, 1 ) ).xy;\n#endif";

	var worldpos_vertex = "#if defined( USE_ENVMAP ) || defined( DISTANCE ) || defined ( USE_SHADOWMAP )\n\tvec4 worldPosition = vec4( transformed, 1.0 );\n\t#ifdef USE_INSTANCING\n\t\tworldPosition = instanceMatrix * worldPosition;\n\t#endif\n\tworldPosition = modelMatrix * worldPosition;\n#endif";

	var background_frag = "uniform sampler2D t2D;\nvarying vec2 vUv;\nvoid main() {\n\tvec4 texColor = texture2D( t2D, vUv );\n\tgl_FragColor = mapTexelToLinear( texColor );\n\t#include <tonemapping_fragment>\n\t#include <encodings_fragment>\n}";

	var background_vert = "varying vec2 vUv;\nuniform mat3 uvTransform;\nvoid main() {\n\tvUv = ( uvTransform * vec3( uv, 1 ) ).xy;\n\tgl_Position = vec4( position.xy, 1.0, 1.0 );\n}";

	var cube_frag = "#include <envmap_common_pars_fragment>\nuniform float opacity;\nvarying vec3 vWorldDirection;\n#include <cube_uv_reflection_fragment>\nvoid main() {\n\tvec3 vReflect = vWorldDirection;\n\t#include <envmap_fragment>\n\tgl_FragColor = envColor;\n\tgl_FragColor.a *= opacity;\n\t#include <tonemapping_fragment>\n\t#include <encodings_fragment>\n}";

	var cube_vert = "varying vec3 vWorldDirection;\n#include <common>\nvoid main() {\n\tvWorldDirection = transformDirection( position, modelMatrix );\n\t#include <begin_vertex>\n\t#include <project_vertex>\n\tgl_Position.z = gl_Position.w;\n}";

	var depth_frag = "#if DEPTH_PACKING == 3200\n\tuniform float opacity;\n#endif\n#include <common>\n#include <packing>\n#include <uv_pars_fragment>\n#include <map_pars_fragment>\n#include <alphamap_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tvec4 diffuseColor = vec4( 1.0 );\n\t#if DEPTH_PACKING == 3200\n\t\tdiffuseColor.a = opacity;\n\t#endif\n\t#include <map_fragment>\n\t#include <alphamap_fragment>\n\t#include <alphatest_fragment>\n\t#include <logdepthbuf_fragment>\n\t#if DEPTH_PACKING == 3200\n\t\tgl_FragColor = vec4( vec3( 1.0 - gl_FragCoord.z ), opacity );\n\t#elif DEPTH_PACKING == 3201\n\t\tgl_FragColor = packDepthToRGBA( gl_FragCoord.z );\n\t#endif\n}";

	var depth_vert = "#include <common>\n#include <uv_pars_vertex>\n#include <displacementmap_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\t#include <skinbase_vertex>\n\t#ifdef USE_DISPLACEMENTMAP\n\t\t#include <beginnormal_vertex>\n\t\t#include <morphnormal_vertex>\n\t\t#include <skinnormal_vertex>\n\t#endif\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <displacementmap_vertex>\n\t#include <project_vertex>\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n}";

	var distanceRGBA_frag = "#define DISTANCE\nuniform vec3 referencePosition;\nuniform float nearDistance;\nuniform float farDistance;\nvarying vec3 vWorldPosition;\n#include <common>\n#include <packing>\n#include <uv_pars_fragment>\n#include <map_pars_fragment>\n#include <alphamap_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main () {\n\t#include <clipping_planes_fragment>\n\tvec4 diffuseColor = vec4( 1.0 );\n\t#include <map_fragment>\n\t#include <alphamap_fragment>\n\t#include <alphatest_fragment>\n\tfloat dist = length( vWorldPosition - referencePosition );\n\tdist = ( dist - nearDistance ) / ( farDistance - nearDistance );\n\tdist = saturate( dist );\n\tgl_FragColor = packDepthToRGBA( dist );\n}";

	var distanceRGBA_vert = "#define DISTANCE\nvarying vec3 vWorldPosition;\n#include <common>\n#include <uv_pars_vertex>\n#include <displacementmap_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\t#include <skinbase_vertex>\n\t#ifdef USE_DISPLACEMENTMAP\n\t\t#include <beginnormal_vertex>\n\t\t#include <morphnormal_vertex>\n\t\t#include <skinnormal_vertex>\n\t#endif\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <displacementmap_vertex>\n\t#include <project_vertex>\n\t#include <worldpos_vertex>\n\t#include <clipping_planes_vertex>\n\tvWorldPosition = worldPosition.xyz;\n}";

	var equirect_frag = "uniform sampler2D tEquirect;\nvarying vec3 vWorldDirection;\n#include <common>\nvoid main() {\n\tvec3 direction = normalize( vWorldDirection );\n\tvec2 sampleUV;\n\tsampleUV.y = asin( clamp( direction.y, - 1.0, 1.0 ) ) * RECIPROCAL_PI + 0.5;\n\tsampleUV.x = atan( direction.z, direction.x ) * RECIPROCAL_PI2 + 0.5;\n\tvec4 texColor = texture2D( tEquirect, sampleUV );\n\tgl_FragColor = mapTexelToLinear( texColor );\n\t#include <tonemapping_fragment>\n\t#include <encodings_fragment>\n}";

	var equirect_vert = "varying vec3 vWorldDirection;\n#include <common>\nvoid main() {\n\tvWorldDirection = transformDirection( position, modelMatrix );\n\t#include <begin_vertex>\n\t#include <project_vertex>\n}";

	var linedashed_frag = "uniform vec3 diffuse;\nuniform float opacity;\nuniform float dashSize;\nuniform float totalSize;\nvarying float vLineDistance;\n#include <common>\n#include <color_pars_fragment>\n#include <fog_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tif ( mod( vLineDistance, totalSize ) > dashSize ) {\n\t\tdiscard;\n\t}\n\tvec3 outgoingLight = vec3( 0.0 );\n\tvec4 diffuseColor = vec4( diffuse, opacity );\n\t#include <logdepthbuf_fragment>\n\t#include <color_fragment>\n\toutgoingLight = diffuseColor.rgb;\n\tgl_FragColor = vec4( outgoingLight, diffuseColor.a );\n\t#include <tonemapping_fragment>\n\t#include <encodings_fragment>\n\t#include <fog_fragment>\n\t#include <premultiplied_alpha_fragment>\n}";

	var linedashed_vert = "uniform float scale;\nattribute float lineDistance;\nvarying float vLineDistance;\n#include <common>\n#include <color_pars_vertex>\n#include <fog_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <color_vertex>\n\tvLineDistance = scale * lineDistance;\n\tvec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );\n\tgl_Position = projectionMatrix * mvPosition;\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n\t#include <fog_vertex>\n}";

	var meshbasic_frag = "uniform vec3 diffuse;\nuniform float opacity;\n#ifndef FLAT_SHADED\n\tvarying vec3 vNormal;\n#endif\n#include <common>\n#include <color_pars_fragment>\n#include <uv_pars_fragment>\n#include <uv2_pars_fragment>\n#include <map_pars_fragment>\n#include <alphamap_pars_fragment>\n#include <aomap_pars_fragment>\n#include <lightmap_pars_fragment>\n#include <envmap_common_pars_fragment>\n#include <envmap_pars_fragment>\n#include <cube_uv_reflection_fragment>\n#include <fog_pars_fragment>\n#include <specularmap_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tvec4 diffuseColor = vec4( diffuse, opacity );\n\t#include <logdepthbuf_fragment>\n\t#include <map_fragment>\n\t#include <color_fragment>\n\t#include <alphamap_fragment>\n\t#include <alphatest_fragment>\n\t#include <transparent_fragment>\n\t#include <specularmap_fragment>\n\tReflectedLight reflectedLight = ReflectedLight( vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ) );\n\t#ifdef USE_LIGHTMAP\n\t\tvec4 lightMapTexel= texture2D( lightMap, vUv2 );\n\t\treflectedLight.indirectDiffuse += lightMapTexelToLinear( lightMapTexel ).rgb * lightMapIntensity;\n\t#else\n\t\treflectedLight.indirectDiffuse += vec3( 1.0 );\n\t#endif\n\t#include <aomap_fragment>\n\treflectedLight.indirectDiffuse *= diffuseColor.rgb;\n\tvec3 outgoingLight = reflectedLight.indirectDiffuse;\n\t#include <envmap_fragment>\n\tgl_FragColor = vec4( outgoingLight, diffuseColor.a );\n\t#include <tonemapping_fragment>\n\t#include <encodings_fragment>\n\t#include <fog_fragment>\n\t#include <premultiplied_alpha_fragment>\n}";

	var meshbasic_vert = "#include <common>\n#include <uv_pars_vertex>\n#include <uv2_pars_vertex>\n#include <envmap_pars_vertex>\n#include <color_pars_vertex>\n#include <fog_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\t#include <uv2_vertex>\n\t#include <color_vertex>\n\t#include <skinbase_vertex>\n\t#ifdef USE_ENVMAP\n\t#include <beginnormal_vertex>\n\t#include <morphnormal_vertex>\n\t#include <skinnormal_vertex>\n\t#include <defaultnormal_vertex>\n\t#endif\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <project_vertex>\n\t#include <logdepthbuf_vertex>\n\t#include <worldpos_vertex>\n\t#include <clipping_planes_vertex>\n\t#include <envmap_vertex>\n\t#include <fog_vertex>\n}";

	var meshlambert_frag = "uniform vec3 diffuse;\nuniform vec3 emissive;\nuniform float opacity;\nvarying vec3 vLightFront;\nvarying vec3 vIndirectFront;\n#ifdef DOUBLE_SIDED\n\tvarying vec3 vLightBack;\n\tvarying vec3 vIndirectBack;\n#endif\n#include <common>\n#include <packing>\n#include <dithering_pars_fragment>\n#include <color_pars_fragment>\n#include <uv_pars_fragment>\n#include <uv2_pars_fragment>\n#include <map_pars_fragment>\n#include <alphamap_pars_fragment>\n#include <aomap_pars_fragment>\n#include <lightmap_pars_fragment>\n#include <emissivemap_pars_fragment>\n#include <envmap_common_pars_fragment>\n#include <envmap_pars_fragment>\n#include <cube_uv_reflection_fragment>\n#include <bsdfs>\n#include <lights_pars_begin>\n#include <fog_pars_fragment>\n#include <shadowmap_pars_fragment>\n#include <shadowmask_pars_fragment>\n#include <specularmap_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tvec4 diffuseColor = vec4( diffuse, opacity );\n\tReflectedLight reflectedLight = ReflectedLight( vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ) );\n\tvec3 totalEmissiveRadiance = emissive;\n\t#include <logdepthbuf_fragment>\n\t#include <map_fragment>\n\t#include <color_fragment>\n\t#include <alphamap_fragment>\n\t#include <alphatest_fragment>\n\t#include <transparent_fragment>\n\t#include <specularmap_fragment>\n\t#include <emissivemap_fragment>\n\treflectedLight.indirectDiffuse = getAmbientLightIrradiance( ambientLightColor );\n\t#ifdef DOUBLE_SIDED\n\t\treflectedLight.indirectDiffuse += ( gl_FrontFacing ) ? vIndirectFront : vIndirectBack;\n\t#else\n\t\treflectedLight.indirectDiffuse += vIndirectFront;\n\t#endif\n\t#include <lightmap_fragment>\n\treflectedLight.indirectDiffuse *= BRDF_Diffuse_Lambert( diffuseColor.rgb );\n\t#ifdef DOUBLE_SIDED\n\t\treflectedLight.directDiffuse = ( gl_FrontFacing ) ? vLightFront : vLightBack;\n\t#else\n\t\treflectedLight.directDiffuse = vLightFront;\n\t#endif\n\treflectedLight.directDiffuse *= BRDF_Diffuse_Lambert( diffuseColor.rgb ) * getShadowMask();\n\t#include <aomap_fragment>\n\tvec3 outgoingLight = reflectedLight.directDiffuse + reflectedLight.indirectDiffuse + totalEmissiveRadiance;\n\t#include <envmap_fragment>\n\tgl_FragColor = vec4( outgoingLight, diffuseColor.a );\n\t#include <tonemapping_fragment>\n\t#include <encodings_fragment>\n\t#include <fog_fragment>\n\t#include <premultiplied_alpha_fragment>\n\t#include <dithering_fragment>\n}";

	var meshlambert_vert = "#define LAMBERT\nvarying vec3 vLightFront;\nvarying vec3 vIndirectFront;\n#ifdef DOUBLE_SIDED\n\tvarying vec3 vLightBack;\n\tvarying vec3 vIndirectBack;\n#endif\n#include <common>\n#include <uv_pars_vertex>\n#include <uv2_pars_vertex>\n#include <envmap_pars_vertex>\n#include <bsdfs>\n#include <lights_pars_begin>\n#include <color_pars_vertex>\n#include <fog_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <shadowmap_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\t#include <uv2_vertex>\n\t#include <color_vertex>\n\t#include <beginnormal_vertex>\n\t#include <morphnormal_vertex>\n\t#include <skinbase_vertex>\n\t#include <skinnormal_vertex>\n\t#include <defaultnormal_vertex>\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <project_vertex>\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n\t#include <worldpos_vertex>\n\t#include <envmap_vertex>\n\t#include <lights_lambert_vertex>\n\t#include <shadowmap_vertex>\n\t#include <fog_vertex>\n}";

	var meshmatcap_frag = "#define MATCAP\nuniform vec3 diffuse;\nuniform float opacity;\nuniform sampler2D matcap;\nvarying vec3 vViewPosition;\n#ifndef FLAT_SHADED\n\tvarying vec3 vNormal;\n#endif\n#include <common>\n#include <uv_pars_fragment>\n#include <map_pars_fragment>\n#include <alphamap_pars_fragment>\n#include <fog_pars_fragment>\n#include <bumpmap_pars_fragment>\n#include <normalmap_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tvec4 diffuseColor = vec4( diffuse, opacity );\n\t#include <logdepthbuf_fragment>\n\t#include <map_fragment>\n\t#include <alphamap_fragment>\n\t#include <alphatest_fragment>\n\t#include <transparent_fragment>\n\t#include <normal_fragment_begin>\n\t#include <normal_fragment_maps>\n\tvec3 viewDir = normalize( vViewPosition );\n\tvec3 x = normalize( vec3( viewDir.z, 0.0, - viewDir.x ) );\n\tvec3 y = cross( viewDir, x );\n\tvec2 uv = vec2( dot( x, normal ), dot( y, normal ) ) * 0.495 + 0.5;\n\t#ifdef USE_MATCAP\n\t\tvec4 matcapColor = texture2D( matcap, uv );\n\t\tmatcapColor = matcapTexelToLinear( matcapColor );\n\t#else\n\t\tvec4 matcapColor = vec4( 1.0 );\n\t#endif\n\tvec3 outgoingLight = diffuseColor.rgb * matcapColor.rgb;\n\tgl_FragColor = vec4( outgoingLight, diffuseColor.a );\n\t#include <tonemapping_fragment>\n\t#include <encodings_fragment>\n\t#include <fog_fragment>\n\t#include <premultiplied_alpha_fragment>\n}";

	var meshmatcap_vert = "#define MATCAP\nvarying vec3 vViewPosition;\n#ifndef FLAT_SHADED\n\tvarying vec3 vNormal;\n#endif\n#include <common>\n#include <uv_pars_vertex>\n#include <displacementmap_pars_vertex>\n#include <fog_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\t#include <beginnormal_vertex>\n\t#include <morphnormal_vertex>\n\t#include <skinbase_vertex>\n\t#include <skinnormal_vertex>\n\t#include <defaultnormal_vertex>\n\t#ifndef FLAT_SHADED\n\t\tvNormal = normalize( transformedNormal );\n\t#endif\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <displacementmap_vertex>\n\t#include <project_vertex>\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n\t#include <fog_vertex>\n\tvViewPosition = - mvPosition.xyz;\n}";

	var meshtoon_frag = "#define TOON\nuniform vec3 diffuse;\nuniform vec3 emissive;\nuniform vec3 specular;\nuniform float shininess;\nuniform float opacity;\n#include <common>\n#include <packing>\n#include <dithering_pars_fragment>\n#include <color_pars_fragment>\n#include <uv_pars_fragment>\n#include <uv2_pars_fragment>\n#include <map_pars_fragment>\n#include <alphamap_pars_fragment>\n#include <aomap_pars_fragment>\n#include <lightmap_pars_fragment>\n#include <emissivemap_pars_fragment>\n#include <gradientmap_pars_fragment>\n#include <fog_pars_fragment>\n#include <bsdfs>\n#include <lights_pars_begin>\n#include <lights_toon_pars_fragment>\n#include <shadowmap_pars_fragment>\n#include <bumpmap_pars_fragment>\n#include <normalmap_pars_fragment>\n#include <specularmap_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tvec4 diffuseColor = vec4( diffuse, opacity );\n\tReflectedLight reflectedLight = ReflectedLight( vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ) );\n\tvec3 totalEmissiveRadiance = emissive;\n\t#include <logdepthbuf_fragment>\n\t#include <map_fragment>\n\t#include <color_fragment>\n\t#include <alphamap_fragment>\n\t#include <alphatest_fragment>\n\t#include <transparent_fragment>\n\t#include <specularmap_fragment>\n\t#include <normal_fragment_begin>\n\t#include <normal_fragment_maps>\n\t#include <emissivemap_fragment>\n\t#include <lights_toon_fragment>\n\t#include <lights_fragment_begin>\n\t#include <lights_fragment_maps>\n\t#include <lights_fragment_end>\n\t#include <aomap_fragment>\n\tvec3 outgoingLight = reflectedLight.directDiffuse + reflectedLight.indirectDiffuse + reflectedLight.directSpecular + reflectedLight.indirectSpecular + totalEmissiveRadiance;\n\tgl_FragColor = vec4( outgoingLight, diffuseColor.a );\n\t#include <tonemapping_fragment>\n\t#include <encodings_fragment>\n\t#include <fog_fragment>\n\t#include <premultiplied_alpha_fragment>\n\t#include <dithering_fragment>\n}";

	var meshtoon_vert = "#define TOON\nvarying vec3 vViewPosition;\n#ifndef FLAT_SHADED\n\tvarying vec3 vNormal;\n#endif\n#include <common>\n#include <uv_pars_vertex>\n#include <uv2_pars_vertex>\n#include <displacementmap_pars_vertex>\n#include <color_pars_vertex>\n#include <fog_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <shadowmap_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\t#include <uv2_vertex>\n\t#include <color_vertex>\n\t#include <beginnormal_vertex>\n\t#include <morphnormal_vertex>\n\t#include <skinbase_vertex>\n\t#include <skinnormal_vertex>\n\t#include <defaultnormal_vertex>\n#ifndef FLAT_SHADED\n\tvNormal = normalize( transformedNormal );\n#endif\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <displacementmap_vertex>\n\t#include <project_vertex>\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n\tvViewPosition = - mvPosition.xyz;\n\t#include <worldpos_vertex>\n\t#include <shadowmap_vertex>\n\t#include <fog_vertex>\n}";

	var meshphong_frag = "#define PHONG\nuniform vec3 diffuse;\nuniform vec3 emissive;\nuniform vec3 specular;\nuniform float shininess;\nuniform float opacity;\n#include <common>\n#include <packing>\n#include <dithering_pars_fragment>\n#include <color_pars_fragment>\n#include <uv_pars_fragment>\n#include <uv2_pars_fragment>\n#include <map_pars_fragment>\n#include <alphamap_pars_fragment>\n#include <aomap_pars_fragment>\n#include <lightmap_pars_fragment>\n#include <emissivemap_pars_fragment>\n#include <envmap_common_pars_fragment>\n#include <envmap_pars_fragment>\n#include <cube_uv_reflection_fragment>\n#include <fog_pars_fragment>\n#include <bsdfs>\n#include <lights_pars_begin>\n#include <lights_phong_pars_fragment>\n#include <shadowmap_pars_fragment>\n#include <bumpmap_pars_fragment>\n#include <normalmap_pars_fragment>\n#include <specularmap_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tvec4 diffuseColor = vec4( diffuse, opacity );\n\tReflectedLight reflectedLight = ReflectedLight( vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ) );\n\tvec3 totalEmissiveRadiance = emissive;\n\t#include <logdepthbuf_fragment>\n\t#include <map_fragment>\n\t#include <color_fragment>\n\t#include <alphamap_fragment>\n\t#include <alphatest_fragment>\n\t#include <transparent_fragment>\n\t#include <specularmap_fragment>\n\t#include <normal_fragment_begin>\n\t#include <normal_fragment_maps>\n\t#include <emissivemap_fragment>\n\t#include <lights_phong_fragment>\n\t#include <lights_fragment_begin>\n\t#include <lights_fragment_maps>\n\t#include <lights_fragment_end>\n\t#include <aomap_fragment>\n\tvec3 outgoingLight = reflectedLight.directDiffuse + reflectedLight.indirectDiffuse + reflectedLight.directSpecular + reflectedLight.indirectSpecular + totalEmissiveRadiance;\n\t#include <envmap_fragment>\n\tgl_FragColor = vec4( outgoingLight, diffuseColor.a );\n\t#include <tonemapping_fragment>\n\t#include <encodings_fragment>\n\t#include <fog_fragment>\n\t#include <premultiplied_alpha_fragment>\n\t#include <dithering_fragment>\n}";

	var meshphong_vert = "#define PHONG\nvarying vec3 vViewPosition;\n#ifndef FLAT_SHADED\n\tvarying vec3 vNormal;\n#endif\n#include <common>\n#include <uv_pars_vertex>\n#include <uv2_pars_vertex>\n#include <displacementmap_pars_vertex>\n#include <envmap_pars_vertex>\n#include <color_pars_vertex>\n#include <fog_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <shadowmap_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\t#include <uv2_vertex>\n\t#include <color_vertex>\n\t#include <beginnormal_vertex>\n\t#include <morphnormal_vertex>\n\t#include <skinbase_vertex>\n\t#include <skinnormal_vertex>\n\t#include <defaultnormal_vertex>\n#ifndef FLAT_SHADED\n\tvNormal = normalize( transformedNormal );\n#endif\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <displacementmap_vertex>\n\t#include <project_vertex>\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n\tvViewPosition = - mvPosition.xyz;\n\t#include <worldpos_vertex>\n\t#include <envmap_vertex>\n\t#include <shadowmap_vertex>\n\t#include <fog_vertex>\n}";

	var meshphysical_frag = "#define STANDARD\n#ifdef PHYSICAL\n\t#define REFLECTIVITY\n\t#define CLEARCOAT\n\t#define TRANSPARENCY\n#endif\nuniform vec3 diffuse;\nuniform vec3 emissive;\nuniform float roughness;\nuniform float metalness;\nuniform float opacity;\n#ifdef TRANSPARENCY\n\tuniform float transparency;\n#endif\n#ifdef REFLECTIVITY\n\tuniform float reflectivity;\n#endif\n#ifdef CLEARCOAT\n\tuniform float clearcoat;\n\tuniform float clearcoatRoughness;\n#endif\n#ifdef USE_SHEEN\n\tuniform vec3 sheen;\n#endif\nvarying vec3 vViewPosition;\n#ifndef FLAT_SHADED\n\tvarying vec3 vNormal;\n\t#ifdef USE_TANGENT\n\t\tvarying vec3 vTangent;\n\t\tvarying vec3 vBitangent;\n\t#endif\n#endif\n#include <common>\n#include <packing>\n#include <dithering_pars_fragment>\n#include <color_pars_fragment>\n#include <uv_pars_fragment>\n#include <uv2_pars_fragment>\n#include <map_pars_fragment>\n#include <alphamap_pars_fragment>\n#include <aomap_pars_fragment>\n#include <lightmap_pars_fragment>\n#include <emissivemap_pars_fragment>\n#include <bsdfs>\n#include <cube_uv_reflection_fragment>\n#include <envmap_common_pars_fragment>\n#include <envmap_physical_pars_fragment>\n#include <fog_pars_fragment>\n#include <lights_pars_begin>\n#include <lights_physical_pars_fragment>\n#include <shadowmap_pars_fragment>\n#include <bumpmap_pars_fragment>\n#include <normalmap_pars_fragment>\n#include <clearcoat_normalmap_pars_fragment>\n#include <roughnessmap_pars_fragment>\n#include <metalnessmap_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tvec4 diffuseColor = vec4( diffuse, opacity );\n\tReflectedLight reflectedLight = ReflectedLight( vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ) );\n\tvec3 totalEmissiveRadiance = emissive;\n\t#include <logdepthbuf_fragment>\n\t#include <map_fragment>\n\t#include <color_fragment>\n\t#include <alphamap_fragment>\n\t#include <alphatest_fragment>\n\t#include <transparent_fragment>\n\t#include <roughnessmap_fragment>\n\t#include <metalnessmap_fragment>\n\t#include <normal_fragment_begin>\n\t#include <normal_fragment_maps>\n\t#include <clearcoat_normal_fragment_begin>\n\t#include <clearcoat_normal_fragment_maps>\n\t#include <emissivemap_fragment>\n\t#include <lights_physical_fragment>\n\t#include <lights_fragment_begin>\n\t#include <lights_fragment_maps>\n\t#include <lights_fragment_end>\n\t#include <aomap_fragment>\n\tvec3 outgoingLight = reflectedLight.directDiffuse + reflectedLight.indirectDiffuse + reflectedLight.directSpecular + reflectedLight.indirectSpecular + totalEmissiveRadiance;\n\t#ifdef TRANSPARENCY\n\t\tdiffuseColor.a *= saturate( 1. - transparency + linearToRelativeLuminance( reflectedLight.directSpecular + reflectedLight.indirectSpecular ) );\n\t#endif\n\tgl_FragColor = vec4( outgoingLight, diffuseColor.a );\n\t#include <tonemapping_fragment>\n\t#include <encodings_fragment>\n\t#include <fog_fragment>\n\t#include <premultiplied_alpha_fragment>\n\t#include <dithering_fragment>\n}";

	var meshphysical_vert = "#define STANDARD\nvarying vec3 vViewPosition;\n#ifndef FLAT_SHADED\n\tvarying vec3 vNormal;\n\t#ifdef USE_TANGENT\n\t\tvarying vec3 vTangent;\n\t\tvarying vec3 vBitangent;\n\t#endif\n#endif\n#include <common>\n#include <uv_pars_vertex>\n#include <uv2_pars_vertex>\n#include <displacementmap_pars_vertex>\n#include <color_pars_vertex>\n#include <fog_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <shadowmap_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\t#include <uv2_vertex>\n\t#include <color_vertex>\n\t#include <beginnormal_vertex>\n\t#include <morphnormal_vertex>\n\t#include <skinbase_vertex>\n\t#include <skinnormal_vertex>\n\t#include <defaultnormal_vertex>\n#ifndef FLAT_SHADED\n\tvNormal = normalize( transformedNormal );\n\t#ifdef USE_TANGENT\n\t\tvTangent = normalize( transformedTangent );\n\t\tvBitangent = normalize( cross( vNormal, vTangent ) * tangent.w );\n\t#endif\n#endif\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <displacementmap_vertex>\n\t#include <project_vertex>\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n\tvViewPosition = - mvPosition.xyz;\n\t#include <worldpos_vertex>\n\t#include <shadowmap_vertex>\n\t#include <fog_vertex>\n}";

	var normal_frag = "#define NORMAL\nuniform float opacity;\n#if defined( FLAT_SHADED ) || defined( USE_BUMPMAP ) || defined( TANGENTSPACE_NORMALMAP )\n\tvarying vec3 vViewPosition;\n#endif\n#ifndef FLAT_SHADED\n\tvarying vec3 vNormal;\n\t#ifdef USE_TANGENT\n\t\tvarying vec3 vTangent;\n\t\tvarying vec3 vBitangent;\n\t#endif\n#endif\n#include <packing>\n#include <uv_pars_fragment>\n#include <bumpmap_pars_fragment>\n#include <normalmap_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\t#include <logdepthbuf_fragment>\n\t#include <normal_fragment_begin>\n\t#include <normal_fragment_maps>\n\tgl_FragColor = vec4( packNormalToRGB( normal ), opacity );\n}";

	var normal_vert = "#define NORMAL\n#if defined( FLAT_SHADED ) || defined( USE_BUMPMAP ) || defined( TANGENTSPACE_NORMALMAP )\n\tvarying vec3 vViewPosition;\n#endif\n#ifndef FLAT_SHADED\n\tvarying vec3 vNormal;\n\t#ifdef USE_TANGENT\n\t\tvarying vec3 vTangent;\n\t\tvarying vec3 vBitangent;\n\t#endif\n#endif\n#include <common>\n#include <uv_pars_vertex>\n#include <displacementmap_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\t#include <beginnormal_vertex>\n\t#include <morphnormal_vertex>\n\t#include <skinbase_vertex>\n\t#include <skinnormal_vertex>\n\t#include <defaultnormal_vertex>\n#ifndef FLAT_SHADED\n\tvNormal = normalize( transformedNormal );\n\t#ifdef USE_TANGENT\n\t\tvTangent = normalize( transformedTangent );\n\t\tvBitangent = normalize( cross( vNormal, vTangent ) * tangent.w );\n\t#endif\n#endif\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <displacementmap_vertex>\n\t#include <project_vertex>\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n#if defined( FLAT_SHADED ) || defined( USE_BUMPMAP ) || defined( TANGENTSPACE_NORMALMAP )\n\tvViewPosition = - mvPosition.xyz;\n#endif\n}";

	var points_frag = "uniform vec3 diffuse;\nuniform float opacity;\n#include <common>\n#include <color_pars_fragment>\n#include <map_particle_pars_fragment>\n#include <fog_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tvec3 outgoingLight = vec3( 0.0 );\n\tvec4 diffuseColor = vec4( diffuse, opacity );\n\t#include <logdepthbuf_fragment>\n\t#include <map_particle_fragment>\n\t#include <color_fragment>\n\t#include <alphatest_fragment>\n\t#include <transparent_fragment>\n\toutgoingLight = diffuseColor.rgb;\n\tgl_FragColor = vec4( outgoingLight, diffuseColor.a );\n\t#include <tonemapping_fragment>\n\t#include <encodings_fragment>\n\t#include <fog_fragment>\n\t#include <premultiplied_alpha_fragment>\n}";

	var points_vert = "uniform float size;\nuniform float scale;\n#include <common>\n#include <color_pars_vertex>\n#include <fog_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <color_vertex>\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <project_vertex>\n\tgl_PointSize = size;\n\t#ifdef USE_SIZEATTENUATION\n\t\tbool isPerspective = isPerspectiveMatrix( projectionMatrix );\n\t\tif ( isPerspective ) gl_PointSize *= ( scale / - mvPosition.z );\n\t#endif\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n\t#include <worldpos_vertex>\n\t#include <fog_vertex>\n}";

	var shadow_frag = "uniform vec3 color;\nuniform float opacity;\n#include <common>\n#include <packing>\n#include <fog_pars_fragment>\n#include <bsdfs>\n#include <lights_pars_begin>\n#include <shadowmap_pars_fragment>\n#include <shadowmask_pars_fragment>\nvoid main() {\n\tgl_FragColor = vec4( color, opacity * ( 1.0 - getShadowMask() ) );\n\t#include <tonemapping_fragment>\n\t#include <encodings_fragment>\n\t#include <fog_fragment>\n}";

	var shadow_vert = "#include <fog_pars_vertex>\n#include <shadowmap_pars_vertex>\nvoid main() {\n\t#include <begin_vertex>\n\t#include <project_vertex>\n\t#include <worldpos_vertex>\n\t#include <shadowmap_vertex>\n\t#include <fog_vertex>\n}";

	var sprite_frag = "uniform vec3 diffuse;\nuniform float opacity;\n#include <common>\n#include <uv_pars_fragment>\n#include <map_pars_fragment>\n#include <alphamap_pars_fragment>\n#include <fog_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tvec3 outgoingLight = vec3( 0.0 );\n\tvec4 diffuseColor = vec4( diffuse, opacity );\n\t#include <logdepthbuf_fragment>\n\t#include <map_fragment>\n\t#include <alphamap_fragment>\n\t#include <alphatest_fragment>\n\t#include <transparent_fragment>\n\toutgoingLight = diffuseColor.rgb;\n\tgl_FragColor = vec4( outgoingLight, diffuseColor.a );\n\t#include <tonemapping_fragment>\n\t#include <encodings_fragment>\n\t#include <fog_fragment>\n}";

	var sprite_vert = "uniform float rotation;\nuniform vec2 center;\n#include <common>\n#include <uv_pars_vertex>\n#include <fog_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\tvec4 mvPosition = modelViewMatrix * vec4( 0.0, 0.0, 0.0, 1.0 );\n\tvec2 scale;\n\tscale.x = length( vec3( modelMatrix[ 0 ].x, modelMatrix[ 0 ].y, modelMatrix[ 0 ].z ) );\n\tscale.y = length( vec3( modelMatrix[ 1 ].x, modelMatrix[ 1 ].y, modelMatrix[ 1 ].z ) );\n\t#ifndef USE_SIZEATTENUATION\n\t\tbool isPerspective = isPerspectiveMatrix( projectionMatrix );\n\t\tif ( isPerspective ) scale *= - mvPosition.z;\n\t#endif\n\tvec2 alignedPosition = ( position.xy - ( center - vec2( 0.5 ) ) ) * scale;\n\tvec2 rotatedPosition;\n\trotatedPosition.x = cos( rotation ) * alignedPosition.x - sin( rotation ) * alignedPosition.y;\n\trotatedPosition.y = sin( rotation ) * alignedPosition.x + cos( rotation ) * alignedPosition.y;\n\tmvPosition.xy += rotatedPosition;\n\tgl_Position = projectionMatrix * mvPosition;\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n\t#include <fog_vertex>\n}";

	var ShaderChunk = {
		alphamap_fragment: alphamap_fragment,
		alphamap_pars_fragment: alphamap_pars_fragment,
		alphatest_fragment: alphatest_fragment,
		aomap_fragment: aomap_fragment,
		aomap_pars_fragment: aomap_pars_fragment,
		begin_vertex: begin_vertex,
		beginnormal_vertex: beginnormal_vertex,
		bsdfs: bsdfs,
		bumpmap_pars_fragment: bumpmap_pars_fragment,
		clipping_planes_fragment: clipping_planes_fragment,
		clipping_planes_pars_fragment: clipping_planes_pars_fragment,
		clipping_planes_pars_vertex: clipping_planes_pars_vertex,
		clipping_planes_vertex: clipping_planes_vertex,
		color_fragment: color_fragment,
		color_pars_fragment: color_pars_fragment,
		color_pars_vertex: color_pars_vertex,
		color_vertex: color_vertex,
		common: common,
		cube_uv_reflection_fragment: cube_uv_reflection_fragment,
		defaultnormal_vertex: defaultnormal_vertex,
		displacementmap_pars_vertex: displacementmap_pars_vertex,
		displacementmap_vertex: displacementmap_vertex,
		emissivemap_fragment: emissivemap_fragment,
		emissivemap_pars_fragment: emissivemap_pars_fragment,
		encodings_fragment: encodings_fragment,
		encodings_pars_fragment: encodings_pars_fragment,
		envmap_fragment: envmap_fragment,
		envmap_common_pars_fragment: envmap_common_pars_fragment,
		envmap_pars_fragment: envmap_pars_fragment,
		envmap_pars_vertex: envmap_pars_vertex,
		envmap_physical_pars_fragment: envmap_physical_pars_fragment,
		envmap_vertex: envmap_vertex,
		fog_vertex: fog_vertex,
		fog_pars_vertex: fog_pars_vertex,
		fog_fragment: fog_fragment,
		fog_pars_fragment: fog_pars_fragment,
		gradientmap_pars_fragment: gradientmap_pars_fragment,
		lightmap_fragment: lightmap_fragment,
		lightmap_pars_fragment: lightmap_pars_fragment,
		lights_lambert_vertex: lights_lambert_vertex,
		lights_pars_begin: lights_pars_begin,
		lights_toon_fragment: lights_toon_fragment,
		lights_toon_pars_fragment: lights_toon_pars_fragment,
		lights_phong_fragment: lights_phong_fragment,
		lights_phong_pars_fragment: lights_phong_pars_fragment,
		lights_physical_fragment: lights_physical_fragment,
		lights_physical_pars_fragment: lights_physical_pars_fragment,
		lights_fragment_begin: lights_fragment_begin,
		lights_fragment_maps: lights_fragment_maps,
		lights_fragment_end: lights_fragment_end,
		logdepthbuf_fragment: logdepthbuf_fragment,
		logdepthbuf_pars_fragment: logdepthbuf_pars_fragment,
		logdepthbuf_pars_vertex: logdepthbuf_pars_vertex,
		logdepthbuf_vertex: logdepthbuf_vertex,
		map_fragment: map_fragment,
		map_pars_fragment: map_pars_fragment,
		map_particle_fragment: map_particle_fragment,
		map_particle_pars_fragment: map_particle_pars_fragment,
		metalnessmap_fragment: metalnessmap_fragment,
		metalnessmap_pars_fragment: metalnessmap_pars_fragment,
		morphnormal_vertex: morphnormal_vertex,
		morphtarget_pars_vertex: morphtarget_pars_vertex,
		morphtarget_vertex: morphtarget_vertex,
		normal_fragment_begin: normal_fragment_begin,
		normal_fragment_maps: normal_fragment_maps,
		normalmap_pars_fragment: normalmap_pars_fragment,
		clearcoat_normal_fragment_begin: clearcoat_normal_fragment_begin,
		clearcoat_normal_fragment_maps: clearcoat_normal_fragment_maps,
		clearcoat_normalmap_pars_fragment: clearcoat_normalmap_pars_fragment,
		packing: packing,
		premultiplied_alpha_fragment: premultiplied_alpha_fragment,
		project_vertex: project_vertex,
		dithering_fragment: dithering_fragment,
		dithering_pars_fragment: dithering_pars_fragment,
		roughnessmap_fragment: roughnessmap_fragment,
		roughnessmap_pars_fragment: roughnessmap_pars_fragment,
		shadowmap_pars_fragment: shadowmap_pars_fragment,
		shadowmap_pars_vertex: shadowmap_pars_vertex,
		shadowmap_vertex: shadowmap_vertex,
		shadowmask_pars_fragment: shadowmask_pars_fragment,
		skinbase_vertex: skinbase_vertex,
		skinning_pars_vertex: skinning_pars_vertex,
		skinning_vertex: skinning_vertex,
		skinnormal_vertex: skinnormal_vertex,
		specularmap_fragment: specularmap_fragment,
		specularmap_pars_fragment: specularmap_pars_fragment,
		transparent_fragment: transparent_fragment,
		tonemapping_fragment: tonemapping_fragment,
		tonemapping_pars_fragment: tonemapping_pars_fragment,
		uv_pars_fragment: uv_pars_fragment,
		uv_pars_vertex: uv_pars_vertex,
		uv_vertex: uv_vertex,
		uv2_pars_fragment: uv2_pars_fragment,
		uv2_pars_vertex: uv2_pars_vertex,
		uv2_vertex: uv2_vertex,
		worldpos_vertex: worldpos_vertex,

		background_frag: background_frag,
		background_vert: background_vert,
		cube_frag: cube_frag,
		cube_vert: cube_vert,
		depth_frag: depth_frag,
		depth_vert: depth_vert,
		distanceRGBA_frag: distanceRGBA_frag,
		distanceRGBA_vert: distanceRGBA_vert,
		equirect_frag: equirect_frag,
		equirect_vert: equirect_vert,
		linedashed_frag: linedashed_frag,
		linedashed_vert: linedashed_vert,
		meshbasic_frag: meshbasic_frag,
		meshbasic_vert: meshbasic_vert,
		meshlambert_frag: meshlambert_frag,
		meshlambert_vert: meshlambert_vert,
		meshmatcap_frag: meshmatcap_frag,
		meshmatcap_vert: meshmatcap_vert,
		meshtoon_frag: meshtoon_frag,
		meshtoon_vert: meshtoon_vert,
		meshphong_frag: meshphong_frag,
		meshphong_vert: meshphong_vert,
		meshphysical_frag: meshphysical_frag,
		meshphysical_vert: meshphysical_vert,
		normal_frag: normal_frag,
		normal_vert: normal_vert,
		points_frag: points_frag,
		points_vert: points_vert,
		shadow_frag: shadow_frag,
		shadow_vert: shadow_vert,
		sprite_frag: sprite_frag,
		sprite_vert: sprite_vert
	};

	/**
	 * @author alteredq / http://alteredqualia.com/
	 * @author mrdoob / http://mrdoob.com/
	 * @author mikael emtinger / http://gomo.se/
	 */

	var ShaderLib = {

		basic: {

			uniforms: mergeUniforms( [
				UniformsLib.common,
				UniformsLib.specularmap,
				UniformsLib.envmap,
				UniformsLib.aomap,
				UniformsLib.lightmap,
				UniformsLib.fog
			] ),

			vertexShader: ShaderChunk.meshbasic_vert,
			fragmentShader: ShaderChunk.meshbasic_frag

		},

		lambert: {

			uniforms: mergeUniforms( [
				UniformsLib.common,
				UniformsLib.specularmap,
				UniformsLib.envmap,
				UniformsLib.aomap,
				UniformsLib.lightmap,
				UniformsLib.emissivemap,
				UniformsLib.fog,
				UniformsLib.lights,
				{
					emissive: { value: new Color( 0x000000 ) }
				}
			] ),

			vertexShader: ShaderChunk.meshlambert_vert,
			fragmentShader: ShaderChunk.meshlambert_frag

		},

		phong: {

			uniforms: mergeUniforms( [
				UniformsLib.common,
				UniformsLib.specularmap,
				UniformsLib.envmap,
				UniformsLib.aomap,
				UniformsLib.lightmap,
				UniformsLib.emissivemap,
				UniformsLib.bumpmap,
				UniformsLib.normalmap,
				UniformsLib.displacementmap,
				UniformsLib.fog,
				UniformsLib.lights,
				{
					emissive: { value: new Color( 0x000000 ) },
					specular: { value: new Color( 0x111111 ) },
					shininess: { value: 30 }
				}
			] ),

			vertexShader: ShaderChunk.meshphong_vert,
			fragmentShader: ShaderChunk.meshphong_frag

		},

		standard: {

			uniforms: mergeUniforms( [
				UniformsLib.common,
				UniformsLib.envmap,
				UniformsLib.aomap,
				UniformsLib.lightmap,
				UniformsLib.emissivemap,
				UniformsLib.bumpmap,
				UniformsLib.normalmap,
				UniformsLib.displacementmap,
				UniformsLib.roughnessmap,
				UniformsLib.metalnessmap,
				UniformsLib.fog,
				UniformsLib.lights,
				{
					emissive: { value: new Color( 0x000000 ) },
					roughness: { value: 0.5 },
					metalness: { value: 0.5 },
					envMapIntensity: { value: 1 } // temporary
				}
			] ),

			vertexShader: ShaderChunk.meshphysical_vert,
			fragmentShader: ShaderChunk.meshphysical_frag

		},

		toon: {

			uniforms: mergeUniforms( [
				UniformsLib.common,
				UniformsLib.specularmap,
				UniformsLib.aomap,
				UniformsLib.lightmap,
				UniformsLib.emissivemap,
				UniformsLib.bumpmap,
				UniformsLib.normalmap,
				UniformsLib.displacementmap,
				UniformsLib.gradientmap,
				UniformsLib.fog,
				UniformsLib.lights,
				{
					emissive: { value: new Color( 0x000000 ) },
					specular: { value: new Color( 0x111111 ) },
					shininess: { value: 30 }
				}
			] ),

			vertexShader: ShaderChunk.meshtoon_vert,
			fragmentShader: ShaderChunk.meshtoon_frag

		},

		matcap: {

			uniforms: mergeUniforms( [
				UniformsLib.common,
				UniformsLib.bumpmap,
				UniformsLib.normalmap,
				UniformsLib.displacementmap,
				UniformsLib.fog,
				{
					matcap: { value: null }
				}
			] ),

			vertexShader: ShaderChunk.meshmatcap_vert,
			fragmentShader: ShaderChunk.meshmatcap_frag

		},

		points: {

			uniforms: mergeUniforms( [
				UniformsLib.points,
				UniformsLib.fog
			] ),

			vertexShader: ShaderChunk.points_vert,
			fragmentShader: ShaderChunk.points_frag

		},

		dashed: {

			uniforms: mergeUniforms( [
				UniformsLib.common,
				UniformsLib.fog,
				{
					scale: { value: 1 },
					dashSize: { value: 1 },
					totalSize: { value: 2 }
				}
			] ),

			vertexShader: ShaderChunk.linedashed_vert,
			fragmentShader: ShaderChunk.linedashed_frag

		},

		depth: {

			uniforms: mergeUniforms( [
				UniformsLib.common,
				UniformsLib.displacementmap
			] ),

			vertexShader: ShaderChunk.depth_vert,
			fragmentShader: ShaderChunk.depth_frag

		},

		normal: {

			uniforms: mergeUniforms( [
				UniformsLib.common,
				UniformsLib.bumpmap,
				UniformsLib.normalmap,
				UniformsLib.displacementmap,
				{
					opacity: { value: 1.0 }
				}
			] ),

			vertexShader: ShaderChunk.normal_vert,
			fragmentShader: ShaderChunk.normal_frag

		},

		sprite: {

			uniforms: mergeUniforms( [
				UniformsLib.sprite,
				UniformsLib.fog
			] ),

			vertexShader: ShaderChunk.sprite_vert,
			fragmentShader: ShaderChunk.sprite_frag

		},

		background: {

			uniforms: {
				uvTransform: { value: new Matrix3() },
				t2D: { value: null },
			},

			vertexShader: ShaderChunk.background_vert,
			fragmentShader: ShaderChunk.background_frag

		},
		/* -------------------------------------------------------------------------
		//	Cube map shader
		 ------------------------------------------------------------------------- */

		cube: {

			uniforms: mergeUniforms( [
				UniformsLib.envmap,
				{
					opacity: { value: 1.0 }
				}
			] ),

			vertexShader: ShaderChunk.cube_vert,
			fragmentShader: ShaderChunk.cube_frag

		},

		equirect: {

			uniforms: {
				tEquirect: { value: null },
			},

			vertexShader: ShaderChunk.equirect_vert,
			fragmentShader: ShaderChunk.equirect_frag

		},

		distanceRGBA: {

			uniforms: mergeUniforms( [
				UniformsLib.common,
				UniformsLib.displacementmap,
				{
					referencePosition: { value: new Vector3() },
					nearDistance: { value: 1 },
					farDistance: { value: 1000 }
				}
			] ),

			vertexShader: ShaderChunk.distanceRGBA_vert,
			fragmentShader: ShaderChunk.distanceRGBA_frag

		},

		shadow: {

			uniforms: mergeUniforms( [
				UniformsLib.lights,
				UniformsLib.fog,
				{
					color: { value: new Color( 0x00000 ) },
					opacity: { value: 1.0 }
				} ] ),

			vertexShader: ShaderChunk.shadow_vert,
			fragmentShader: ShaderChunk.shadow_frag

		}

	};

	ShaderLib.physical = {

		uniforms: mergeUniforms( [
			ShaderLib.standard.uniforms,
			{
				transparency: { value: 0 },
				clearcoat: { value: 0 },
				clearcoatRoughness: { value: 0 },
				sheen: { value: new Color( 0x000000 ) },
				clearcoatNormalScale: { value: new Vector2( 1, 1 ) },
				clearcoatNormalMap: { value: null },
			}
		] ),

		vertexShader: ShaderChunk.meshphysical_vert,
		fragmentShader: ShaderChunk.meshphysical_frag

	};

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function WebGLBackground( renderer, state, objects, premultipliedAlpha ) {

		var clearColor = new Color( 0x000000 );
		var clearAlpha = 0;

		var planeMesh;
		var boxMesh;

		var currentBackground = null;
		var currentBackgroundVersion = 0;
		var currentTonemapping = null;

		function render( renderList, scene, camera, forceClear ) {

			var background = scene.background;

			// Ignore background in AR
			// TODO: Reconsider this.

			var xr = renderer.xr;
			var session = xr.getSession && xr.getSession();

			if ( session && session.environmentBlendMode === 'additive' ) {

				background = null;

			}

			if ( background === null ) {

				setClear( clearColor, clearAlpha );

			} else if ( background && background.isColor ) {

				setClear( background, 1 );
				forceClear = true;

			}

			if ( renderer.autoClear || forceClear ) {

				renderer.clear( renderer.autoClearColor, renderer.autoClearDepth, renderer.autoClearStencil );

			}

			if ( background && ( background.isCubeTexture || background.isWebGLCubeRenderTarget || background.mapping === CubeUVReflectionMapping ) ) {

				if ( boxMesh === undefined ) {

					boxMesh = new Mesh(
						new BoxBufferGeometry( 1, 1, 1 ),
						new ShaderMaterial( {
							type: 'BackgroundCubeMaterial',
							uniforms: cloneUniforms( ShaderLib.cube.uniforms ),
							vertexShader: ShaderLib.cube.vertexShader,
							fragmentShader: ShaderLib.cube.fragmentShader,
							side: BackSide,
							depthTest: false,
							depthWrite: false,
							fog: false
						} )
					);

					boxMesh.geometry.deleteAttribute( 'normal' );
					boxMesh.geometry.deleteAttribute( 'uv' );

					boxMesh.onBeforeRender = function ( renderer, scene, camera ) {

						this.matrixWorld.copyPosition( camera.matrixWorld );

					};

					// enable code injection for non-built-in material
					Object.defineProperty( boxMesh.material, 'envMap', {

						get: function () {

							return this.uniforms.envMap.value;

						}

					} );

					objects.update( boxMesh );

				}

				var texture = background.isWebGLCubeRenderTarget ? background.texture : background;

				boxMesh.material.uniforms.envMap.value = texture;
				boxMesh.material.uniforms.flipEnvMap.value = texture.isCubeTexture ? - 1 : 1;

				if ( currentBackground !== background ||
					currentBackgroundVersion !== texture.version ||
					currentTonemapping !== renderer.toneMapping ) {

					boxMesh.material.needsUpdate = true;

					currentBackground = background;
					currentBackgroundVersion = texture.version;
					currentTonemapping = renderer.toneMapping;

				}

				// push to the pre-sorted opaque render list
				renderList.unshift( boxMesh, boxMesh.geometry, boxMesh.material, 0, 0, null );

			} else if ( background && background.isTexture ) {

				if ( planeMesh === undefined ) {

					planeMesh = new Mesh(
						new PlaneBufferGeometry( 2, 2 ),
						new ShaderMaterial( {
							type: 'BackgroundMaterial',
							uniforms: cloneUniforms( ShaderLib.background.uniforms ),
							vertexShader: ShaderLib.background.vertexShader,
							fragmentShader: ShaderLib.background.fragmentShader,
							side: FrontSide,
							depthTest: false,
							depthWrite: false,
							fog: false
						} )
					);

					planeMesh.geometry.deleteAttribute( 'normal' );

					// enable code injection for non-built-in material
					Object.defineProperty( planeMesh.material, 'map', {

						get: function () {

							return this.uniforms.t2D.value;

						}

					} );

					objects.update( planeMesh );

				}

				planeMesh.material.uniforms.t2D.value = background;

				if ( background.matrixAutoUpdate === true ) {

					background.updateMatrix();

				}

				planeMesh.material.uniforms.uvTransform.value.copy( background.matrix );

				if ( currentBackground !== background ||
					currentBackgroundVersion !== background.version ||
					currentTonemapping !== renderer.toneMapping ) {

					planeMesh.material.needsUpdate = true;

					currentBackground = background;
					currentBackgroundVersion = background.version;
					currentTonemapping = renderer.toneMapping;

				}


				// push to the pre-sorted opaque render list
				renderList.unshift( planeMesh, planeMesh.geometry, planeMesh.material, 0, 0, null );

			}

		}

		function setClear( color, alpha ) {

			state.buffers.color.setClear( color.r, color.g, color.b, alpha, premultipliedAlpha );

		}

		return {

			getClearColor: function () {

				return clearColor;

			},
			setClearColor: function ( color, alpha ) {

				clearColor.set( color );
				clearAlpha = alpha !== undefined ? alpha : 1;
				setClear( clearColor, clearAlpha );

			},
			getClearAlpha: function () {

				return clearAlpha;

			},
			setClearAlpha: function ( alpha ) {

				clearAlpha = alpha;
				setClear( clearColor, clearAlpha );

			},
			render: render

		};

	}

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function WebGLBufferRenderer( gl, extensions, info, capabilities ) {

		var isWebGL2 = capabilities.isWebGL2;

		var mode;

		function setMode( value ) {

			mode = value;

		}

		function render( start, count ) {

			gl.drawArrays( mode, start, count );

			info.update( count, mode );

		}

		function renderInstances( geometry, start, count, primcount ) {

			if ( primcount === 0 ) { return; }

			var extension, methodName;

			if ( isWebGL2 ) {

				extension = gl;
				methodName = 'drawArraysInstanced';

			} else {

				extension = extensions.get( 'ANGLE_instanced_arrays' );
				methodName = 'drawArraysInstancedANGLE';

				if ( extension === null ) {

					console.error( 'THREE.WebGLBufferRenderer: using THREE.InstancedBufferGeometry but hardware does not support extension ANGLE_instanced_arrays.' );
					return;

				}

			}

			extension[ methodName ]( mode, start, count, primcount );

			info.update( count, mode, primcount );

		}

		//

		this.setMode = setMode;
		this.render = render;
		this.renderInstances = renderInstances;

	}

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function WebGLCapabilities( gl, extensions, parameters ) {

		var maxAnisotropy;

		function getMaxAnisotropy() {

			if ( maxAnisotropy !== undefined ) { return maxAnisotropy; }

			var extension = extensions.get( 'EXT_texture_filter_anisotropic' );

			if ( extension !== null ) {

				maxAnisotropy = gl.getParameter( extension.MAX_TEXTURE_MAX_ANISOTROPY_EXT );

			} else {

				maxAnisotropy = 0;

			}

			return maxAnisotropy;

		}

		function getMaxPrecision( precision ) {

			if ( precision === 'highp' ) {

				if ( gl.getShaderPrecisionFormat( 35633, 36338 ).precision > 0 &&
					gl.getShaderPrecisionFormat( 35632, 36338 ).precision > 0 ) {

					return 'highp';

				}

				precision = 'mediump';

			}

			if ( precision === 'mediump' ) {

				if ( gl.getShaderPrecisionFormat( 35633, 36337 ).precision > 0 &&
					gl.getShaderPrecisionFormat( 35632, 36337 ).precision > 0 ) {

					return 'mediump';

				}

			}

			return 'lowp';

		}

		/* eslint-disable no-undef */
		var isWebGL2 = ( typeof WebGL2RenderingContext !== 'undefined' && gl instanceof WebGL2RenderingContext ) ||
			( typeof WebGL2ComputeRenderingContext !== 'undefined' && gl instanceof WebGL2ComputeRenderingContext );
		/* eslint-enable no-undef */

		var precision = parameters.precision !== undefined ? parameters.precision : 'highp';
		var maxPrecision = getMaxPrecision( precision );

		if ( maxPrecision !== precision ) {

			console.warn( 'THREE.WebGLRenderer:', precision, 'not supported, using', maxPrecision, 'instead.' );
			precision = maxPrecision;

		}

		var logarithmicDepthBuffer = parameters.logarithmicDepthBuffer === true;

		var maxTextures = gl.getParameter( 34930 );
		var maxVertexTextures = gl.getParameter( 35660 );
		var maxTextureSize = gl.getParameter( 3379 );
		var maxCubemapSize = gl.getParameter( 34076 );

		var maxAttributes = gl.getParameter( 34921 );
		var maxVertexUniforms = gl.getParameter( 36347 );
		var maxVaryings = gl.getParameter( 36348 );
		var maxFragmentUniforms = gl.getParameter( 36349 );

		var vertexTextures = maxVertexTextures > 0;
		var floatFragmentTextures = isWebGL2 || !! extensions.get( 'OES_texture_float' );
		var floatVertexTextures = vertexTextures && floatFragmentTextures;

		var maxSamples = isWebGL2 ? gl.getParameter( 36183 ) : 0;

		return {

			isWebGL2: isWebGL2,

			getMaxAnisotropy: getMaxAnisotropy,
			getMaxPrecision: getMaxPrecision,

			precision: precision,
			logarithmicDepthBuffer: logarithmicDepthBuffer,

			maxTextures: maxTextures,
			maxVertexTextures: maxVertexTextures,
			maxTextureSize: maxTextureSize,
			maxCubemapSize: maxCubemapSize,

			maxAttributes: maxAttributes,
			maxVertexUniforms: maxVertexUniforms,
			maxVaryings: maxVaryings,
			maxFragmentUniforms: maxFragmentUniforms,

			vertexTextures: vertexTextures,
			floatFragmentTextures: floatFragmentTextures,
			floatVertexTextures: floatVertexTextures,

			maxSamples: maxSamples

		};

	}

	/**
	 * @author tschw
	 */

	function WebGLClipping() {

		var scope = this,

			globalState = null,
			numGlobalPlanes = 0,
			localClippingEnabled = false,
			renderingShadows = false,

			plane = new Plane(),
			viewNormalMatrix = new Matrix3(),

			uniform = { value: null, needsUpdate: false };

		this.uniform = uniform;
		this.numPlanes = 0;
		this.numIntersection = 0;

		this.init = function ( planes, enableLocalClipping, camera ) {

			var enabled =
				planes.length !== 0 ||
				enableLocalClipping ||
				// enable state of previous frame - the clipping code has to
				// run another frame in order to reset the state:
				numGlobalPlanes !== 0 ||
				localClippingEnabled;

			localClippingEnabled = enableLocalClipping;

			globalState = projectPlanes( planes, camera, 0 );
			numGlobalPlanes = planes.length;

			return enabled;

		};

		this.beginShadows = function () {

			renderingShadows = true;
			projectPlanes( null );

		};

		this.endShadows = function () {

			renderingShadows = false;
			resetGlobalState();

		};

		this.setState = function ( planes, clipIntersection, clipShadows, camera, cache, fromCache ) {

			if ( ! localClippingEnabled || planes === null || planes.length === 0 || renderingShadows && ! clipShadows ) {

				// there's no local clipping

				if ( renderingShadows ) {

					// there's no global clipping

					projectPlanes( null );

				} else {

					resetGlobalState();

				}

			} else {

				var nGlobal = renderingShadows ? 0 : numGlobalPlanes,
					lGlobal = nGlobal * 4,

					dstArray = cache.clippingState || null;

				uniform.value = dstArray; // ensure unique state

				dstArray = projectPlanes( planes, camera, lGlobal, fromCache );

				for ( var i = 0; i !== lGlobal; ++ i ) {

					dstArray[ i ] = globalState[ i ];

				}

				cache.clippingState = dstArray;
				this.numIntersection = clipIntersection ? this.numPlanes : 0;
				this.numPlanes += nGlobal;

			}


		};

		function resetGlobalState() {

			if ( uniform.value !== globalState ) {

				uniform.value = globalState;
				uniform.needsUpdate = numGlobalPlanes > 0;

			}

			scope.numPlanes = numGlobalPlanes;
			scope.numIntersection = 0;

		}

		function projectPlanes( planes, camera, dstOffset, skipTransform ) {

			var nPlanes = planes !== null ? planes.length : 0,
				dstArray = null;

			if ( nPlanes !== 0 ) {

				dstArray = uniform.value;

				if ( skipTransform !== true || dstArray === null ) {

					var flatSize = dstOffset + nPlanes * 4,
						viewMatrix = camera.matrixWorldInverse;

					viewNormalMatrix.getNormalMatrix( viewMatrix );

					if ( dstArray === null || dstArray.length < flatSize ) {

						dstArray = new Float32Array( flatSize );

					}

					for ( var i = 0, i4 = dstOffset; i !== nPlanes; ++ i, i4 += 4 ) {

						plane.copy( planes[ i ] ).applyMatrix4( viewMatrix, viewNormalMatrix );

						plane.normal.toArray( dstArray, i4 );
						dstArray[ i4 + 3 ] = plane.constant;

					}

				}

				uniform.value = dstArray;
				uniform.needsUpdate = true;

			}

			scope.numPlanes = nPlanes;
			scope.numIntersection = 0;

			return dstArray;

		}

	}

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function WebGLExtensions( gl ) {

		var extensions = {};

		return {

			get: function ( name ) {

				if ( extensions[ name ] !== undefined ) {

					return extensions[ name ];

				}

				var extension;

				switch ( name ) {

					case 'WEBGL_depth_texture':
						extension = gl.getExtension( 'WEBGL_depth_texture' ) || gl.getExtension( 'MOZ_WEBGL_depth_texture' ) || gl.getExtension( 'WEBKIT_WEBGL_depth_texture' );
						break;

					case 'EXT_texture_filter_anisotropic':
						extension = gl.getExtension( 'EXT_texture_filter_anisotropic' ) || gl.getExtension( 'MOZ_EXT_texture_filter_anisotropic' ) || gl.getExtension( 'WEBKIT_EXT_texture_filter_anisotropic' );
						break;

					case 'WEBGL_compressed_texture_s3tc':
						extension = gl.getExtension( 'WEBGL_compressed_texture_s3tc' ) || gl.getExtension( 'MOZ_WEBGL_compressed_texture_s3tc' ) || gl.getExtension( 'WEBKIT_WEBGL_compressed_texture_s3tc' );
						break;

					case 'WEBGL_compressed_texture_pvrtc':
						extension = gl.getExtension( 'WEBGL_compressed_texture_pvrtc' ) || gl.getExtension( 'WEBKIT_WEBGL_compressed_texture_pvrtc' );
						break;

					default:
						extension = gl.getExtension( name );

				}

				if ( extension === null ) {

					console.warn( 'THREE.WebGLRenderer: ' + name + ' extension not supported.' );

				}

				extensions[ name ] = extension;

				return extension;

			}

		};

	}

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function WebGLGeometries( gl, attributes, info ) {

		var geometries = new WeakMap();
		var wireframeAttributes = new WeakMap();

		function onGeometryDispose( event ) {

			var geometry = event.target;
			var buffergeometry = geometries.get( geometry );

			if ( buffergeometry.index !== null ) {

				attributes.remove( buffergeometry.index );

			}

			for ( var name in buffergeometry.attributes ) {

				attributes.remove( buffergeometry.attributes[ name ] );

			}

			geometry.removeEventListener( 'dispose', onGeometryDispose );

			geometries.delete( geometry );

			var attribute = wireframeAttributes.get( buffergeometry );

			if ( attribute ) {

				attributes.remove( attribute );
				wireframeAttributes.delete( buffergeometry );

			}

			//

			info.memory.geometries --;

		}

		function get( object, geometry ) {

			var buffergeometry = geometries.get( geometry );

			if ( buffergeometry ) { return buffergeometry; }

			geometry.addEventListener( 'dispose', onGeometryDispose );

			if ( geometry.isBufferGeometry ) {

				buffergeometry = geometry;

			} else if ( geometry.isGeometry ) {

				if ( geometry._bufferGeometry === undefined ) {

					geometry._bufferGeometry = new BufferGeometry().setFromObject( object );

				}

				buffergeometry = geometry._bufferGeometry;

			}

			geometries.set( geometry, buffergeometry );

			info.memory.geometries ++;

			return buffergeometry;

		}

		function update( geometry ) {

			var index = geometry.index;
			var geometryAttributes = geometry.attributes;

			if ( index !== null ) {

				attributes.update( index, 34963 );

			}

			for ( var name in geometryAttributes ) {

				attributes.update( geometryAttributes[ name ], 34962 );

			}

			// morph targets

			var morphAttributes = geometry.morphAttributes;

			for ( var name in morphAttributes ) {

				var array = morphAttributes[ name ];

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

					attributes.update( array[ i ], 34962 );

				}

			}

		}

		function updateWireframeAttribute( geometry ) {

			var indices = [];

			var geometryIndex = geometry.index;
			var geometryPosition = geometry.attributes.position;
			var version = 0;

			if ( geometryIndex !== null ) {

				var array = geometryIndex.array;
				version = geometryIndex.version;

				for ( var i = 0, l = array.length; i < l; i += 3 ) {

					var a = array[ i + 0 ];
					var b = array[ i + 1 ];
					var c = array[ i + 2 ];

					indices.push( a, b, b, c, c, a );

				}

			} else {

				var array = geometryPosition.array;
				version = geometryPosition.version;

				for ( var i = 0, l = ( array.length / 3 ) - 1; i < l; i += 3 ) {

					var a = i + 0;
					var b = i + 1;
					var c = i + 2;

					indices.push( a, b, b, c, c, a );

				}

			}

			var attribute = new ( arrayMax( indices ) > 65535 ? Uint32BufferAttribute : Uint16BufferAttribute )( indices, 1 );
			attribute.version = version;

			attributes.update( attribute, 34963 );

			//

			var previousAttribute = wireframeAttributes.get( geometry );

			if ( previousAttribute ) { attributes.remove( previousAttribute ); }

			//

			wireframeAttributes.set( geometry, attribute );

		}

		function getWireframeAttribute( geometry ) {

			var currentAttribute = wireframeAttributes.get( geometry );

			if ( currentAttribute ) {

				var geometryIndex = geometry.index;

				if ( geometryIndex !== null ) {

					// if the attribute is obsolete, create a new one

					if ( currentAttribute.version < geometryIndex.version ) {

						updateWireframeAttribute( geometry );

					}

				}

			} else {

				updateWireframeAttribute( geometry );

			}

			return wireframeAttributes.get( geometry );

		}

		return {

			get: get,
			update: update,

			getWireframeAttribute: getWireframeAttribute

		};

	}

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function WebGLIndexedBufferRenderer( gl, extensions, info, capabilities ) {

		var isWebGL2 = capabilities.isWebGL2;

		var mode;

		function setMode( value ) {

			mode = value;

		}

		var type, bytesPerElement;

		function setIndex( value ) {

			type = value.type;
			bytesPerElement = value.bytesPerElement;

		}

		function render( start, count ) {

			gl.drawElements( mode, count, type, start * bytesPerElement );

			info.update( count, mode );

		}

		function renderInstances( geometry, start, count, primcount ) {

			if ( primcount === 0 ) { return; }

			var extension, methodName;

			if ( isWebGL2 ) {

				extension = gl;
				methodName = 'drawElementsInstanced';

			} else {

				extension = extensions.get( 'ANGLE_instanced_arrays' );
				methodName = 'drawElementsInstancedANGLE';

				if ( extension === null ) {

					console.error( 'THREE.WebGLIndexedBufferRenderer: using THREE.InstancedBufferGeometry but hardware does not support extension ANGLE_instanced_arrays.' );
					return;

				}

			}

			extension[ methodName ]( mode, count, type, start * bytesPerElement, primcount );

			info.update( count, mode, primcount );

		}

		//

		this.setMode = setMode;
		this.setIndex = setIndex;
		this.render = render;
		this.renderInstances = renderInstances;

	}

	/**
	 * @author Mugen87 / https://github.com/Mugen87
	 */

	function WebGLInfo( gl ) {

		var memory = {
			geometries: 0,
			textures: 0
		};

		var render = {
			frame: 0,
			calls: 0,
			triangles: 0,
			points: 0,
			lines: 0
		};

		function update( count, mode, instanceCount ) {

			instanceCount = instanceCount || 1;

			render.calls ++;

			switch ( mode ) {

				case 4:
					render.triangles += instanceCount * ( count / 3 );
					break;

				case 1:
					render.lines += instanceCount * ( count / 2 );
					break;

				case 3:
					render.lines += instanceCount * ( count - 1 );
					break;

				case 2:
					render.lines += instanceCount * count;
					break;

				case 0:
					render.points += instanceCount * count;
					break;

				default:
					console.error( 'THREE.WebGLInfo: Unknown draw mode:', mode );
					break;

			}

		}

		function reset() {

			render.frame ++;
			render.calls = 0;
			render.triangles = 0;
			render.points = 0;
			render.lines = 0;

		}

		return {
			memory: memory,
			render: render,
			programs: null,
			autoReset: true,
			reset: reset,
			update: update
		};

	}

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function absNumericalSort( a, b ) {

		return Math.abs( b[ 1 ] ) - Math.abs( a[ 1 ] );

	}

	function WebGLMorphtargets( gl ) {

		var influencesList = {};
		var morphInfluences = new Float32Array( 8 );

		function update( object, geometry, material, program ) {

			var objectInfluences = object.morphTargetInfluences;

			// When object doesn't have morph target influences defined, we treat it as a 0-length array
			// This is important to make sure we set up morphTargetBaseInfluence / morphTargetInfluences

			var length = objectInfluences === undefined ? 0 : objectInfluences.length;

			var influences = influencesList[ geometry.id ];

			if ( influences === undefined ) {

				// initialise list

				influences = [];

				for ( var i = 0; i < length; i ++ ) {

					influences[ i ] = [ i, 0 ];

				}

				influencesList[ geometry.id ] = influences;

			}

			var morphTargets = material.morphTargets && geometry.morphAttributes.position;
			var morphNormals = material.morphNormals && geometry.morphAttributes.normal;

			// Remove current morphAttributes

			for ( var i = 0; i < length; i ++ ) {

				var influence = influences[ i ];

				if ( influence[ 1 ] !== 0 ) {

					if ( morphTargets ) { geometry.deleteAttribute( 'morphTarget' + i ); }
					if ( morphNormals ) { geometry.deleteAttribute( 'morphNormal' + i ); }

				}

			}

			// Collect influences

			for ( var i = 0; i < length; i ++ ) {

				var influence = influences[ i ];

				influence[ 0 ] = i;
				influence[ 1 ] = objectInfluences[ i ];

			}

			influences.sort( absNumericalSort );

			// Add morphAttributes

			var morphInfluencesSum = 0;

			for ( var i = 0; i < 8; i ++ ) {

				var influence = influences[ i ];

				if ( influence ) {

					var index = influence[ 0 ];
					var value = influence[ 1 ];

					if ( value ) {

						if ( morphTargets ) { geometry.setAttribute( 'morphTarget' + i, morphTargets[ index ] ); }
						if ( morphNormals ) { geometry.setAttribute( 'morphNormal' + i, morphNormals[ index ] ); }

						morphInfluences[ i ] = value;
						morphInfluencesSum += value;
						continue;

					}

				}

				morphInfluences[ i ] = 0;

			}

			// GLSL shader uses formula baseinfluence * base + sum(target * influence)
			// This allows us to switch between absolute morphs and relative morphs without changing shader code
			// When baseinfluence = 1 - sum(influence), the above is equivalent to sum((target - base) * influence)
			var morphBaseInfluence = geometry.morphTargetsRelative ? 1 : 1 - morphInfluencesSum;

			program.getUniforms().setValue( gl, 'morphTargetBaseInfluence', morphBaseInfluence );
			program.getUniforms().setValue( gl, 'morphTargetInfluences', morphInfluences );

		}

		return {

			update: update

		};

	}

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function WebGLObjects( gl, geometries, attributes, info ) {

		var updateMap = new WeakMap();

		function update( object ) {

			var frame = info.render.frame;

			var geometry = object.geometry;
			var buffergeometry = geometries.get( object, geometry );

			// Update once per frame

			if ( updateMap.get( buffergeometry ) !== frame ) {

				if ( geometry.isGeometry ) {

					buffergeometry.updateFromObject( object );

				}

				geometries.update( buffergeometry );

				updateMap.set( buffergeometry, frame );

			}

			if ( object.isInstancedMesh ) {

				attributes.update( object.instanceMatrix, 34962 );

			}

			return buffergeometry;

		}

		function dispose() {

			updateMap = new WeakMap();

		}

		return {

			update: update,
			dispose: dispose

		};

	}

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function CubeTexture( images, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy, encoding ) {

		images = images !== undefined ? images : [];
		mapping = mapping !== undefined ? mapping : CubeReflectionMapping;
		format = format !== undefined ? format : RGBFormat;

		Texture.call( this, images, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy, encoding );

		this.flipY = false;

	}

	CubeTexture.prototype = Object.create( Texture.prototype );
	CubeTexture.prototype.constructor = CubeTexture;

	CubeTexture.prototype.isCubeTexture = true;

	Object.defineProperty( CubeTexture.prototype, 'images', {

		get: function () {

			return this.image;

		},

		set: function ( value ) {

			this.image = value;

		}

	} );

	/**
	 * @author Takahiro https://github.com/takahirox
	 */

	function DataTexture2DArray( data, width, height, depth ) {

		Texture.call( this, null );

		this.image = { data: data || null, width: width || 1, height: height || 1, depth: depth || 1 };

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

		this.wrapR = ClampToEdgeWrapping;

		this.generateMipmaps = false;
		this.flipY = false;

		this.needsUpdate = true;

	}

	DataTexture2DArray.prototype = Object.create( Texture.prototype );
	DataTexture2DArray.prototype.constructor = DataTexture2DArray;
	DataTexture2DArray.prototype.isDataTexture2DArray = true;

	/**
	 * @author Artur Trzesiok
	 */

	function DataTexture3D( data, width, height, depth ) {

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

		Texture.call( this, null );

		this.image = { data: data || null, width: width || 1, height: height || 1, depth: depth || 1 };

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

		this.wrapR = ClampToEdgeWrapping;

		this.generateMipmaps = false;
		this.flipY = false;

		this.needsUpdate = true;


	}

	DataTexture3D.prototype = Object.create( Texture.prototype );
	DataTexture3D.prototype.constructor = DataTexture3D;
	DataTexture3D.prototype.isDataTexture3D = true;

	/**
	 * @author tschw
	 * @author Mugen87 / https://github.com/Mugen87
	 * @author mrdoob / http://mrdoob.com/
	 *
	 * Uniforms of a program.
	 * Those form a tree structure with a special top-level container for the root,
	 * which you get by calling 'new WebGLUniforms( gl, program )'.
	 *
	 *
	 * Properties of inner nodes including the top-level container:
	 *
	 * .seq - array of nested uniforms
	 * .map - nested uniforms by name
	 *
	 *
	 * Methods of all nodes except the top-level container:
	 *
	 * .setValue( gl, value, [textures] )
	 *
	 * 		uploads a uniform value(s)
	 *  	the 'textures' parameter is needed for sampler uniforms
	 *
	 *
	 * Static methods of the top-level container (textures factorizations):
	 *
	 * .upload( gl, seq, values, textures )
	 *
	 * 		sets uniforms in 'seq' to 'values[id].value'
	 *
	 * .seqWithValue( seq, values ) : filteredSeq
	 *
	 * 		filters 'seq' entries with corresponding entry in values
	 *
	 *
	 * Methods of the top-level container (textures factorizations):
	 *
	 * .setValue( gl, name, value, textures )
	 *
	 * 		sets uniform with  name 'name' to 'value'
	 *
	 * .setOptional( gl, obj, prop )
	 *
	 * 		like .set for an optional property of the object
	 *
	 */

	var emptyTexture = new Texture();
	var emptyTexture2dArray = new DataTexture2DArray();
	var emptyTexture3d = new DataTexture3D();
	var emptyCubeTexture = new CubeTexture();

	// --- Utilities ---

	// Array Caches (provide typed arrays for temporary by size)

	var arrayCacheF32 = [];
	var arrayCacheI32 = [];

	// Float32Array caches used for uploading Matrix uniforms

	var mat4array = new Float32Array( 16 );
	var mat3array = new Float32Array( 9 );
	var mat2array = new Float32Array( 4 );

	// Flattening for arrays of vectors and matrices

	function flatten( array, nBlocks, blockSize ) {

		var firstElem = array[ 0 ];

		if ( firstElem <= 0 || firstElem > 0 ) { return array; }
		// unoptimized: ! isNaN( firstElem )
		// see http://jacksondunstan.com/articles/983

		var n = nBlocks * blockSize,
			r = arrayCacheF32[ n ];

		if ( r === undefined ) {

			r = new Float32Array( n );
			arrayCacheF32[ n ] = r;

		}

		if ( nBlocks !== 0 ) {

			firstElem.toArray( r, 0 );

			for ( var i = 1, offset = 0; i !== nBlocks; ++ i ) {

				offset += blockSize;
				array[ i ].toArray( r, offset );

			}

		}

		return r;

	}

	function arraysEqual( a, b ) {

		if ( a.length !== b.length ) { return false; }

		for ( var i = 0, l = a.length; i < l; i ++ ) {

			if ( a[ i ] !== b[ i ] ) { return false; }

		}

		return true;

	}

	function copyArray( a, b ) {

		for ( var i = 0, l = b.length; i < l; i ++ ) {

			a[ i ] = b[ i ];

		}

	}

	// Texture unit allocation

	function allocTexUnits( textures, n ) {

		var r = arrayCacheI32[ n ];

		if ( r === undefined ) {

			r = new Int32Array( n );
			arrayCacheI32[ n ] = r;

		}

		for ( var i = 0; i !== n; ++ i )
			{ r[ i ] = textures.allocateTextureUnit(); }

		return r;

	}

	// --- Setters ---

	// Note: Defining these methods externally, because they come in a bunch
	// and this way their names minify.

	// Single scalar

	function setValueV1f( gl, v ) {

		var cache = this.cache;

		if ( cache[ 0 ] === v ) { return; }

		gl.uniform1f( this.addr, v );

		cache[ 0 ] = v;

	}

	// Single float vector (from flat array or THREE.VectorN)

	function setValueV2f( gl, v ) {

		var cache = this.cache;

		if ( v.x !== undefined ) {

			if ( cache[ 0 ] !== v.x || cache[ 1 ] !== v.y ) {

				gl.uniform2f( this.addr, v.x, v.y );

				cache[ 0 ] = v.x;
				cache[ 1 ] = v.y;

			}

		} else {

			if ( arraysEqual( cache, v ) ) { return; }

			gl.uniform2fv( this.addr, v );

			copyArray( cache, v );

		}

	}

	function setValueV3f( gl, v ) {

		var cache = this.cache;

		if ( v.x !== undefined ) {

			if ( cache[ 0 ] !== v.x || cache[ 1 ] !== v.y || cache[ 2 ] !== v.z ) {

				gl.uniform3f( this.addr, v.x, v.y, v.z );

				cache[ 0 ] = v.x;
				cache[ 1 ] = v.y;
				cache[ 2 ] = v.z;

			}

		} else if ( v.r !== undefined ) {

			if ( cache[ 0 ] !== v.r || cache[ 1 ] !== v.g || cache[ 2 ] !== v.b ) {

				gl.uniform3f( this.addr, v.r, v.g, v.b );

				cache[ 0 ] = v.r;
				cache[ 1 ] = v.g;
				cache[ 2 ] = v.b;

			}

		} else {

			if ( arraysEqual( cache, v ) ) { return; }

			gl.uniform3fv( this.addr, v );

			copyArray( cache, v );

		}

	}

	function setValueV4f( gl, v ) {

		var cache = this.cache;

		if ( v.x !== undefined ) {

			if ( cache[ 0 ] !== v.x || cache[ 1 ] !== v.y || cache[ 2 ] !== v.z || cache[ 3 ] !== v.w ) {

				gl.uniform4f( this.addr, v.x, v.y, v.z, v.w );

				cache[ 0 ] = v.x;
				cache[ 1 ] = v.y;
				cache[ 2 ] = v.z;
				cache[ 3 ] = v.w;

			}

		} else {

			if ( arraysEqual( cache, v ) ) { return; }

			gl.uniform4fv( this.addr, v );

			copyArray( cache, v );

		}

	}

	// Single matrix (from flat array or MatrixN)

	function setValueM2( gl, v ) {

		var cache = this.cache;
		var elements = v.elements;

		if ( elements === undefined ) {

			if ( arraysEqual( cache, v ) ) { return; }

			gl.uniformMatrix2fv( this.addr, false, v );

			copyArray( cache, v );

		} else {

			if ( arraysEqual( cache, elements ) ) { return; }

			mat2array.set( elements );

			gl.uniformMatrix2fv( this.addr, false, mat2array );

			copyArray( cache, elements );

		}

	}

	function setValueM3( gl, v ) {

		var cache = this.cache;
		var elements = v.elements;

		if ( elements === undefined ) {

			if ( arraysEqual( cache, v ) ) { return; }

			gl.uniformMatrix3fv( this.addr, false, v );

			copyArray( cache, v );

		} else {

			if ( arraysEqual( cache, elements ) ) { return; }

			mat3array.set( elements );

			gl.uniformMatrix3fv( this.addr, false, mat3array );

			copyArray( cache, elements );

		}

	}

	function setValueM4( gl, v ) {

		var cache = this.cache;
		var elements = v.elements;

		if ( elements === undefined ) {

			if ( arraysEqual( cache, v ) ) { return; }

			gl.uniformMatrix4fv( this.addr, false, v );

			copyArray( cache, v );

		} else {

			if ( arraysEqual( cache, elements ) ) { return; }

			mat4array.set( elements );

			gl.uniformMatrix4fv( this.addr, false, mat4array );

			copyArray( cache, elements );

		}

	}

	// Single texture (2D / Cube)

	function setValueT1( gl, v, textures ) {

		var cache = this.cache;
		var unit = textures.allocateTextureUnit();

		if ( cache[ 0 ] !== unit ) {

			gl.uniform1i( this.addr, unit );
			cache[ 0 ] = unit;

		}

		textures.safeSetTexture2D( v || emptyTexture, unit );

	}

	function setValueT2DArray1( gl, v, textures ) {

		var cache = this.cache;
		var unit = textures.allocateTextureUnit();

		if ( cache[ 0 ] !== unit ) {

			gl.uniform1i( this.addr, unit );
			cache[ 0 ] = unit;

		}

		textures.setTexture2DArray( v || emptyTexture2dArray, unit );

	}

	function setValueT3D1( gl, v, textures ) {

		var cache = this.cache;
		var unit = textures.allocateTextureUnit();

		if ( cache[ 0 ] !== unit ) {

			gl.uniform1i( this.addr, unit );
			cache[ 0 ] = unit;

		}

		textures.setTexture3D( v || emptyTexture3d, unit );

	}

	function setValueT6( gl, v, textures ) {

		var cache = this.cache;
		var unit = textures.allocateTextureUnit();

		if ( cache[ 0 ] !== unit ) {

			gl.uniform1i( this.addr, unit );
			cache[ 0 ] = unit;

		}

		textures.safeSetTextureCube( v || emptyCubeTexture, unit );

	}

	// Integer / Boolean vectors or arrays thereof (always flat arrays)

	function setValueV1i( gl, v ) {

		var cache = this.cache;

		if ( cache[ 0 ] === v ) { return; }

		gl.uniform1i( this.addr, v );

		cache[ 0 ] = v;

	}

	function setValueV2i( gl, v ) {

		var cache = this.cache;

		if ( arraysEqual( cache, v ) ) { return; }

		gl.uniform2iv( this.addr, v );

		copyArray( cache, v );

	}

	function setValueV3i( gl, v ) {

		var cache = this.cache;

		if ( arraysEqual( cache, v ) ) { return; }

		gl.uniform3iv( this.addr, v );

		copyArray( cache, v );

	}

	function setValueV4i( gl, v ) {

		var cache = this.cache;

		if ( arraysEqual( cache, v ) ) { return; }

		gl.uniform4iv( this.addr, v );

		copyArray( cache, v );

	}

	// uint

	function setValueV1ui( gl, v ) {

		var cache = this.cache;

		if ( cache[ 0 ] === v ) { return; }

		gl.uniform1ui( this.addr, v );

		cache[ 0 ] = v;

	}

	// Helper to pick the right setter for the singular case

	function getSingularSetter( type ) {

		switch ( type ) {

			case 0x1406: return setValueV1f; // FLOAT
			case 0x8b50: return setValueV2f; // _VEC2
			case 0x8b51: return setValueV3f; // _VEC3
			case 0x8b52: return setValueV4f; // _VEC4

			case 0x8b5a: return setValueM2; // _MAT2
			case 0x8b5b: return setValueM3; // _MAT3
			case 0x8b5c: return setValueM4; // _MAT4

			case 0x1404: case 0x8b56: return setValueV1i; // INT, BOOL
			case 0x8b53: case 0x8b57: return setValueV2i; // _VEC2
			case 0x8b54: case 0x8b58: return setValueV3i; // _VEC3
			case 0x8b55: case 0x8b59: return setValueV4i; // _VEC4

			case 0x1405: return setValueV1ui; // UINT

			case 0x8b5e: // SAMPLER_2D
			case 0x8d66: // SAMPLER_EXTERNAL_OES
			case 0x8dca: // INT_SAMPLER_2D
			case 0x8dd2: // UNSIGNED_INT_SAMPLER_2D
			case 0x8b62: // SAMPLER_2D_SHADOW
				return setValueT1;

			case 0x8b5f: // SAMPLER_3D
			case 0x8dcb: // INT_SAMPLER_3D
			case 0x8dd3: // UNSIGNED_INT_SAMPLER_3D
				return setValueT3D1;

			case 0x8b60: // SAMPLER_CUBE
			case 0x8dcc: // INT_SAMPLER_CUBE
			case 0x8dd4: // UNSIGNED_INT_SAMPLER_CUBE
			case 0x8dc5: // SAMPLER_CUBE_SHADOW
				return setValueT6;

			case 0x8dc1: // SAMPLER_2D_ARRAY
			case 0x8dcf: // INT_SAMPLER_2D_ARRAY
			case 0x8dd7: // UNSIGNED_INT_SAMPLER_2D_ARRAY
			case 0x8dc4: // SAMPLER_2D_ARRAY_SHADOW
				return setValueT2DArray1;

		}

	}

	// Array of scalars
	function setValueV1fArray( gl, v ) {

		gl.uniform1fv( this.addr, v );

	}

	// Integer / Boolean vectors or arrays thereof (always flat arrays)
	function setValueV1iArray( gl, v ) {

		gl.uniform1iv( this.addr, v );

	}

	function setValueV2iArray( gl, v ) {

		gl.uniform2iv( this.addr, v );

	}

	function setValueV3iArray( gl, v ) {

		gl.uniform3iv( this.addr, v );

	}

	function setValueV4iArray( gl, v ) {

		gl.uniform4iv( this.addr, v );

	}


	// Array of vectors (flat or from THREE classes)

	function setValueV2fArray( gl, v ) {

		var data = flatten( v, this.size, 2 );

		gl.uniform2fv( this.addr, data );

	}

	function setValueV3fArray( gl, v ) {

		var data = flatten( v, this.size, 3 );

		gl.uniform3fv( this.addr, data );

	}

	function setValueV4fArray( gl, v ) {

		var data = flatten( v, this.size, 4 );

		gl.uniform4fv( this.addr, data );

	}

	// Array of matrices (flat or from THREE clases)

	function setValueM2Array( gl, v ) {

		var data = flatten( v, this.size, 4 );

		gl.uniformMatrix2fv( this.addr, false, data );

	}

	function setValueM3Array( gl, v ) {

		var data = flatten( v, this.size, 9 );

		gl.uniformMatrix3fv( this.addr, false, data );

	}

	function setValueM4Array( gl, v ) {

		var data = flatten( v, this.size, 16 );

		gl.uniformMatrix4fv( this.addr, false, data );

	}

	// Array of textures (2D / Cube)

	function setValueT1Array( gl, v, textures ) {

		var n = v.length;

		var units = allocTexUnits( textures, n );

		gl.uniform1iv( this.addr, units );

		for ( var i = 0; i !== n; ++ i ) {

			textures.safeSetTexture2D( v[ i ] || emptyTexture, units[ i ] );

		}

	}

	function setValueT6Array( gl, v, textures ) {

		var n = v.length;

		var units = allocTexUnits( textures, n );

		gl.uniform1iv( this.addr, units );

		for ( var i = 0; i !== n; ++ i ) {

			textures.safeSetTextureCube( v[ i ] || emptyCubeTexture, units[ i ] );

		}

	}

	// Helper to pick the right setter for a pure (bottom-level) array

	function getPureArraySetter( type ) {

		switch ( type ) {

			case 0x1406: return setValueV1fArray; // FLOAT
			case 0x8b50: return setValueV2fArray; // _VEC2
			case 0x8b51: return setValueV3fArray; // _VEC3
			case 0x8b52: return setValueV4fArray; // _VEC4

			case 0x8b5a: return setValueM2Array; // _MAT2
			case 0x8b5b: return setValueM3Array; // _MAT3
			case 0x8b5c: return setValueM4Array; // _MAT4

			case 0x1404: case 0x8b56: return setValueV1iArray; // INT, BOOL
			case 0x8b53: case 0x8b57: return setValueV2iArray; // _VEC2
			case 0x8b54: case 0x8b58: return setValueV3iArray; // _VEC3
			case 0x8b55: case 0x8b59: return setValueV4iArray; // _VEC4

			case 0x8b5e: // SAMPLER_2D
			case 0x8d66: // SAMPLER_EXTERNAL_OES
			case 0x8dca: // INT_SAMPLER_2D
			case 0x8dd2: // UNSIGNED_INT_SAMPLER_2D
			case 0x8b62: // SAMPLER_2D_SHADOW
				return setValueT1Array;

			case 0x8b60: // SAMPLER_CUBE
			case 0x8dcc: // INT_SAMPLER_CUBE
			case 0x8dd4: // UNSIGNED_INT_SAMPLER_CUBE
			case 0x8dc5: // SAMPLER_CUBE_SHADOW
				return setValueT6Array;

		}

	}

	// --- Uniform Classes ---

	function SingleUniform( id, activeInfo, addr ) {

		this.id = id;
		this.addr = addr;
		this.cache = [];
		this.setValue = getSingularSetter( activeInfo.type );

		// this.path = activeInfo.name; // DEBUG

	}

	function PureArrayUniform( id, activeInfo, addr ) {

		this.id = id;
		this.addr = addr;
		this.cache = [];
		this.size = activeInfo.size;
		this.setValue = getPureArraySetter( activeInfo.type );

		// this.path = activeInfo.name; // DEBUG

	}

	PureArrayUniform.prototype.updateCache = function ( data ) {

		var cache = this.cache;

		if ( data instanceof Float32Array && cache.length !== data.length ) {

			this.cache = new Float32Array( data.length );

		}

		copyArray( cache, data );

	};

	function StructuredUniform( id ) {

		this.id = id;

		this.seq = [];
		this.map = {};

	}

	StructuredUniform.prototype.setValue = function ( gl, value, textures ) {

		var seq = this.seq;

		for ( var i = 0, n = seq.length; i !== n; ++ i ) {

			var u = seq[ i ];
			u.setValue( gl, value[ u.id ], textures );

		}

	};

	// --- Top-level ---

	// Parser - builds up the property tree from the path strings

	var RePathPart = /([\w\d_]+)(\])?(\[|\.)?/g;

	// extracts
	// 	- the identifier (member name or array index)
	//  - followed by an optional right bracket (found when array index)
	//  - followed by an optional left bracket or dot (type of subscript)
	//
	// Note: These portions can be read in a non-overlapping fashion and
	// allow straightforward parsing of the hierarchy that WebGL encodes
	// in the uniform names.

	function addUniform( container, uniformObject ) {

		container.seq.push( uniformObject );
		container.map[ uniformObject.id ] = uniformObject;

	}

	function parseUniform( activeInfo, addr, container ) {

		var path = activeInfo.name,
			pathLength = path.length;

		// reset RegExp object, because of the early exit of a previous run
		RePathPart.lastIndex = 0;

		while ( true ) {

			var match = RePathPart.exec( path ),
				matchEnd = RePathPart.lastIndex,

				id = match[ 1 ],
				idIsIndex = match[ 2 ] === ']',
				subscript = match[ 3 ];

			if ( idIsIndex ) { id = id | 0; } // convert to integer

			if ( subscript === undefined || subscript === '[' && matchEnd + 2 === pathLength ) {

				// bare name or "pure" bottom-level array "[0]" suffix

				addUniform( container, subscript === undefined ?
					new SingleUniform( id, activeInfo, addr ) :
					new PureArrayUniform( id, activeInfo, addr ) );

				break;

			} else {

				// step into inner node / create it in case it doesn't exist

				var map = container.map, next = map[ id ];

				if ( next === undefined ) {

					next = new StructuredUniform( id );
					addUniform( container, next );

				}

				container = next;

			}

		}

	}

	// Root Container

	function WebGLUniforms( gl, program ) {

		this.seq = [];
		this.map = {};

		var n = gl.getProgramParameter( program, 35718 );

		for ( var i = 0; i < n; ++ i ) {

			var info = gl.getActiveUniform( program, i ),
				addr = gl.getUniformLocation( program, info.name );

			parseUniform( info, addr, this );

		}

	}

	WebGLUniforms.prototype.setValue = function ( gl, name, value, textures ) {

		var u = this.map[ name ];

		if ( u !== undefined ) { u.setValue( gl, value, textures ); }

	};

	WebGLUniforms.prototype.setOptional = function ( gl, object, name ) {

		var v = object[ name ];

		if ( v !== undefined ) { this.setValue( gl, name, v ); }

	};


	// Static interface

	WebGLUniforms.upload = function ( gl, seq, values, textures ) {

		for ( var i = 0, n = seq.length; i !== n; ++ i ) {

			var u = seq[ i ],
				v = values[ u.id ];

			if ( v.needsUpdate !== false ) {

				// note: always updating when .needsUpdate is undefined
				u.setValue( gl, v.value, textures );

			}

		}

	};

	WebGLUniforms.seqWithValue = function ( seq, values ) {

		var r = [];

		for ( var i = 0, n = seq.length; i !== n; ++ i ) {

			var u = seq[ i ];
			if ( u.id in values ) { r.push( u ); }

		}

		return r;

	};

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function WebGLShader( gl, type, string ) {

		var shader = gl.createShader( type );

		gl.shaderSource( shader, string );
		gl.compileShader( shader );

		return shader;

	}

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	var programIdCount = 0;

	function addLineNumbers( string ) {

		var lines = string.split( '\n' );

		for ( var i = 0; i < lines.length; i ++ ) {

			lines[ i ] = ( i + 1 ) + ': ' + lines[ i ];

		}

		return lines.join( '\n' );

	}

	function getEncodingComponents( encoding ) {

		switch ( encoding ) {

			case LinearEncoding:
				return [ 'Linear', '( value )' ];
			case sRGBEncoding:
				return [ 'sRGB', '( value )' ];
			case RGBEEncoding:
				return [ 'RGBE', '( value )' ];
			case RGBM7Encoding:
				return [ 'RGBM', '( value, 7.0 )' ];
			case RGBM16Encoding:
				return [ 'RGBM', '( value, 16.0 )' ];
			case RGBDEncoding:
				return [ 'RGBD', '( value, 256.0 )' ];
			case GammaEncoding:
				return [ 'Gamma', '( value, float( GAMMA_FACTOR ) )' ];
			case LogLuvEncoding:
				return [ 'LogLuv', '( value )' ];
			default:
				throw new Error( 'unsupported encoding: ' + encoding );

		}

	}

	function getShaderErrors( gl, shader, type ) {

		var status = gl.getShaderParameter( shader, 35713 );
		var log = gl.getShaderInfoLog( shader ).trim();

		if ( status && log === '' ) { return ''; }

		// --enable-privileged-webgl-extension
		// console.log( '**' + type + '**', gl.getExtension( 'WEBGL_debug_shaders' ).getTranslatedShaderSource( shader ) );

		var source = gl.getShaderSource( shader );

		return 'THREE.WebGLShader: gl.getShaderInfoLog() ' + type + '\n' + log + addLineNumbers( source );

	}

	function getTexelDecodingFunction( functionName, encoding ) {

		var components = getEncodingComponents( encoding );
		return 'vec4 ' + functionName + '( vec4 value ) { return ' + components[ 0 ] + 'ToLinear' + components[ 1 ] + '; }';

	}

	function getTexelEncodingFunction( functionName, encoding ) {

		var components = getEncodingComponents( encoding );
		return 'vec4 ' + functionName + '( vec4 value ) { return LinearTo' + components[ 0 ] + components[ 1 ] + '; }';

	}

	function getToneMappingFunction( functionName, toneMapping ) {

		var toneMappingName;

		switch ( toneMapping ) {

			case LinearToneMapping:
				toneMappingName = 'Linear';
				break;

			case ReinhardToneMapping:
				toneMappingName = 'Reinhard';
				break;

			case Uncharted2ToneMapping:
				toneMappingName = 'Uncharted2';
				break;

			case CineonToneMapping:
				toneMappingName = 'OptimizedCineon';
				break;

			case ACESFilmicToneMapping:
				toneMappingName = 'ACESFilmic';
				break;

			default:
				throw new Error( 'unsupported toneMapping: ' + toneMapping );

		}

		return 'vec3 ' + functionName + '( vec3 color ) { return ' + toneMappingName + 'ToneMapping( color ); }';

	}

	function generateExtensions( parameters ) {

		var chunks = [
			( parameters.extensionDerivatives || parameters.envMapCubeUV || parameters.bumpMap || parameters.tangentSpaceNormalMap || parameters.clearcoatNormalMap || parameters.flatShading || parameters.shaderID === 'physical' ) ? '#extension GL_OES_standard_derivatives : enable' : '',
			( parameters.extensionFragDepth || parameters.logarithmicDepthBuffer ) && parameters.rendererExtensionFragDepth ? '#extension GL_EXT_frag_depth : enable' : '',
			( parameters.extensionDrawBuffers && parameters.rendererExtensionDrawBuffers ) ? '#extension GL_EXT_draw_buffers : require' : '',
			( parameters.extensionShaderTextureLOD || parameters.envMap ) && parameters.rendererExtensionShaderTextureLod ? '#extension GL_EXT_shader_texture_lod : enable' : ''
		];

		return chunks.filter( filterEmptyLine ).join( '\n' );

	}

	function generateDefines( defines ) {

		var chunks = [];

		for ( var name in defines ) {

			var value = defines[ name ];

			if ( value === false ) { continue; }

			chunks.push( '#define ' + name + ' ' + value );

		}

		return chunks.join( '\n' );

	}

	function fetchAttributeLocations( gl, program ) {

		var attributes = {};

		var n = gl.getProgramParameter( program, 35721 );

		for ( var i = 0; i < n; i ++ ) {

			var info = gl.getActiveAttrib( program, i );
			var name = info.name;

			// console.log( 'THREE.WebGLProgram: ACTIVE VERTEX ATTRIBUTE:', name, i );

			attributes[ name ] = gl.getAttribLocation( program, name );

		}

		return attributes;

	}

	function filterEmptyLine( string ) {

		return string !== '';

	}

	function replaceLightNums( string, parameters ) {

		return string
			.replace( /NUM_DIR_LIGHTS/g, parameters.numDirLights )
			.replace( /NUM_SPOT_LIGHTS/g, parameters.numSpotLights )
			.replace( /NUM_RECT_AREA_LIGHTS/g, parameters.numRectAreaLights )
			.replace( /NUM_POINT_LIGHTS/g, parameters.numPointLights )
			.replace( /NUM_HEMI_LIGHTS/g, parameters.numHemiLights )
			.replace( /NUM_DIR_LIGHT_SHADOWS/g, parameters.numDirLightShadows )
			.replace( /NUM_SPOT_LIGHT_SHADOWS/g, parameters.numSpotLightShadows )
			.replace( /NUM_POINT_LIGHT_SHADOWS/g, parameters.numPointLightShadows );

	}

	function replaceClippingPlaneNums( string, parameters ) {

		return string
			.replace( /NUM_CLIPPING_PLANES/g, parameters.numClippingPlanes )
			.replace( /UNION_CLIPPING_PLANES/g, ( parameters.numClippingPlanes - parameters.numClipIntersection ) );

	}

	// Resolve Includes

	var includePattern = /^[ \t]*#include +<([\w\d./]+)>/gm;

	function resolveIncludes( string ) {

		return string.replace( includePattern, includeReplacer );

	}

	function includeReplacer( match, include ) {

		var string = ShaderChunk[ include ];

		if ( string === undefined ) {

			throw new Error( 'Can not resolve #include <' + include + '>' );

		}

		return resolveIncludes( string );

	}

	// Unroll Loops

	var loopPattern = /#pragma unroll_loop[\s]+?for \( int i \= (\d+)\; i < (\d+)\; i \+\+ \) \{([\s\S]+?)(?=\})\}/g;

	function unrollLoops( string ) {

		return string.replace( loopPattern, loopReplacer );

	}

	function loopReplacer( match, start, end, snippet ) {

		var string = '';

		for ( var i = parseInt( start ); i < parseInt( end ); i ++ ) {

			string += snippet
				.replace( /\[ i \]/g, '[ ' + i + ' ]' )
				.replace( /UNROLLED_LOOP_INDEX/g, i );

		}

		return string;

	}

	//

	function generatePrecision( parameters ) {

		var precisionstring = "precision " + parameters.precision + " float;\nprecision " + parameters.precision + " int;";

		if ( parameters.precision === "highp" ) {

			precisionstring += "\n#define HIGH_PRECISION";

		} else if ( parameters.precision === "mediump" ) {

			precisionstring += "\n#define MEDIUM_PRECISION";

		} else if ( parameters.precision === "lowp" ) {

			precisionstring += "\n#define LOW_PRECISION";

		}

		return precisionstring;

	}

	function generateShadowMapTypeDefine( parameters ) {

		var shadowMapTypeDefine = 'SHADOWMAP_TYPE_BASIC';

		if ( parameters.shadowMapType === PCFShadowMap ) {

			shadowMapTypeDefine = 'SHADOWMAP_TYPE_PCF';

		} else if ( parameters.shadowMapType === PCFSoftShadowMap ) {

			shadowMapTypeDefine = 'SHADOWMAP_TYPE_PCF_SOFT';

		} else if ( parameters.shadowMapType === VSMShadowMap ) {

			shadowMapTypeDefine = 'SHADOWMAP_TYPE_VSM';

		}

		return shadowMapTypeDefine;

	}

	function generateEnvMapTypeDefine( parameters ) {

		var envMapTypeDefine = 'ENVMAP_TYPE_CUBE';

		if ( parameters.envMap ) {

			switch ( parameters.envMapMode ) {

				case CubeReflectionMapping:
				case CubeRefractionMapping:
					envMapTypeDefine = 'ENVMAP_TYPE_CUBE';
					break;

				case CubeUVReflectionMapping:
				case CubeUVRefractionMapping:
					envMapTypeDefine = 'ENVMAP_TYPE_CUBE_UV';
					break;

				case EquirectangularReflectionMapping:
				case EquirectangularRefractionMapping:
					envMapTypeDefine = 'ENVMAP_TYPE_EQUIREC';
					break;

				case SphericalReflectionMapping:
					envMapTypeDefine = 'ENVMAP_TYPE_SPHERE';
					break;

			}

		}

		return envMapTypeDefine;

	}

	function generateEnvMapModeDefine( parameters ) {

		var envMapModeDefine = 'ENVMAP_MODE_REFLECTION';

		if ( parameters.envMap ) {

			switch ( parameters.envMapMode ) {

				case CubeRefractionMapping:
				case EquirectangularRefractionMapping:
					envMapModeDefine = 'ENVMAP_MODE_REFRACTION';
					break;

			}

		}

		return envMapModeDefine;

	}

	function generateEnvMapBlendingDefine( parameters ) {

		var envMapBlendingDefine = 'ENVMAP_BLENDING_NONE';

		if ( parameters.envMap ) {

			switch ( parameters.combine ) {

				case MultiplyOperation:
					envMapBlendingDefine = 'ENVMAP_BLENDING_MULTIPLY';
					break;

				case MixOperation:
					envMapBlendingDefine = 'ENVMAP_BLENDING_MIX';
					break;

				case AddOperation:
					envMapBlendingDefine = 'ENVMAP_BLENDING_ADD';
					break;

			}

		}

		return envMapBlendingDefine;

	}

	function WebGLProgram( renderer, cacheKey, parameters ) {

		var gl = renderer.getContext();

		var defines = parameters.defines;

		var vertexShader = parameters.vertexShader;
		var fragmentShader = parameters.fragmentShader;
		var shadowMapTypeDefine = generateShadowMapTypeDefine( parameters );
		var envMapTypeDefine = generateEnvMapTypeDefine( parameters );
		var envMapModeDefine = generateEnvMapModeDefine( parameters );
		var envMapBlendingDefine = generateEnvMapBlendingDefine( parameters );


		var gammaFactorDefine = ( renderer.gammaFactor > 0 ) ? renderer.gammaFactor : 1.0;

		var customExtensions = parameters.isWebGL2 ? '' : generateExtensions( parameters );

		var customDefines = generateDefines( defines );

		var program = gl.createProgram();

		var prefixVertex, prefixFragment;

		var numMultiviewViews = parameters.numMultiviewViews;

		if ( parameters.isRawShaderMaterial ) {

			prefixVertex = [

				customDefines

			].filter( filterEmptyLine ).join( '\n' );

			if ( prefixVertex.length > 0 ) {

				prefixVertex += '\n';

			}

			prefixFragment = [

				customExtensions,
				customDefines

			].filter( filterEmptyLine ).join( '\n' );

			if ( prefixFragment.length > 0 ) {

				prefixFragment += '\n';

			}

		} else {

			prefixVertex = [

				generatePrecision( parameters ),

				'#define SHADER_NAME ' + parameters.shaderName,

				customDefines,

				parameters.instancing ? '#define USE_INSTANCING' : '',
				parameters.supportsVertexTextures ? '#define VERTEX_TEXTURES' : '',

				'#define GAMMA_FACTOR ' + gammaFactorDefine,

				'#define MAX_BONES ' + parameters.maxBones,
				( parameters.useFog && parameters.fog ) ? '#define USE_FOG' : '',
				( parameters.useFog && parameters.fogExp2 ) ? '#define FOG_EXP2' : '',

				parameters.map ? '#define USE_MAP' : '',
				parameters.envMap ? '#define USE_ENVMAP' : '',
				parameters.envMap ? '#define ' + envMapModeDefine : '',
				parameters.lightMap ? '#define USE_LIGHTMAP' : '',
				parameters.aoMap ? '#define USE_AOMAP' : '',
				parameters.emissiveMap ? '#define USE_EMISSIVEMAP' : '',
				parameters.bumpMap ? '#define USE_BUMPMAP' : '',
				parameters.normalMap ? '#define USE_NORMALMAP' : '',
				( parameters.normalMap && parameters.objectSpaceNormalMap ) ? '#define OBJECTSPACE_NORMALMAP' : '',
				( parameters.normalMap && parameters.tangentSpaceNormalMap ) ? '#define TANGENTSPACE_NORMALMAP' : '',

				parameters.clearcoatNormalMap ? '#define USE_CLEARCOAT_NORMALMAP' : '',
				parameters.displacementMap && parameters.supportsVertexTextures ? '#define USE_DISPLACEMENTMAP' : '',
				parameters.specularMap ? '#define USE_SPECULARMAP' : '',
				parameters.roughnessMap ? '#define USE_ROUGHNESSMAP' : '',
				parameters.metalnessMap ? '#define USE_METALNESSMAP' : '',
				parameters.alphaMap ? '#define USE_ALPHAMAP' : '',

				parameters.vertexTangents ? '#define USE_TANGENT' : '',
				parameters.vertexColors ? '#define USE_COLOR' : '',
				parameters.vertexUvs ? '#define USE_UV' : '',
				parameters.uvsVertexOnly ? '#define UVS_VERTEX_ONLY' : '',

				parameters.flatShading ? '#define FLAT_SHADED' : '',

				parameters.skinning ? '#define USE_SKINNING' : '',
				parameters.useVertexTexture ? '#define BONE_TEXTURE' : '',

				parameters.morphTargets ? '#define USE_MORPHTARGETS' : '',
				parameters.morphNormals && parameters.flatShading === false ? '#define USE_MORPHNORMALS' : '',
				parameters.doubleSided ? '#define DOUBLE_SIDED' : '',
				parameters.flipSided ? '#define FLIP_SIDED' : '',

				parameters.shadowMapEnabled ? '#define USE_SHADOWMAP' : '',
				parameters.shadowMapEnabled ? '#define ' + shadowMapTypeDefine : '',

				parameters.sizeAttenuation ? '#define USE_SIZEATTENUATION' : '',

				parameters.logarithmicDepthBuffer ? '#define USE_LOGDEPTHBUF' : '',
				( parameters.logarithmicDepthBuffer && parameters.rendererExtensionFragDepth ) ? '#define USE_LOGDEPTHBUF_EXT' : '',

				'uniform mat4 modelMatrix;',
				'uniform mat4 modelViewMatrix;',
				'uniform mat4 projectionMatrix;',
				'uniform mat4 viewMatrix;',
				'uniform mat3 normalMatrix;',
				'uniform vec3 cameraPosition;',
				'uniform bool isOrthographic;',

				'#ifdef USE_INSTANCING',

				' attribute mat4 instanceMatrix;',

				'#endif',

				'attribute vec3 position;',
				'attribute vec3 normal;',
				'attribute vec2 uv;',

				'#ifdef USE_TANGENT',

				'	attribute vec4 tangent;',

				'#endif',

				'#ifdef USE_COLOR',

				'	attribute vec3 color;',

				'#endif',

				'#ifdef USE_MORPHTARGETS',

				'	attribute vec3 morphTarget0;',
				'	attribute vec3 morphTarget1;',
				'	attribute vec3 morphTarget2;',
				'	attribute vec3 morphTarget3;',

				'	#ifdef USE_MORPHNORMALS',

				'		attribute vec3 morphNormal0;',
				'		attribute vec3 morphNormal1;',
				'		attribute vec3 morphNormal2;',
				'		attribute vec3 morphNormal3;',

				'	#else',

				'		attribute vec3 morphTarget4;',
				'		attribute vec3 morphTarget5;',
				'		attribute vec3 morphTarget6;',
				'		attribute vec3 morphTarget7;',

				'	#endif',

				'#endif',

				'#ifdef USE_SKINNING',

				'	attribute vec4 skinIndex;',
				'	attribute vec4 skinWeight;',

				'#endif',

				'\n'

			].filter( filterEmptyLine ).join( '\n' );

			prefixFragment = [

				customExtensions,

				generatePrecision( parameters ),

				'#define SHADER_NAME ' + parameters.shaderName,

				customDefines,

				parameters.alphaTest ? '#define ALPHATEST ' + parameters.alphaTest + ( parameters.alphaTest % 1 ? '' : '.0' ) : '', // add '.0' if integer

				'#define GAMMA_FACTOR ' + gammaFactorDefine,

				( parameters.useFog && parameters.fog ) ? '#define USE_FOG' : '',
				( parameters.useFog && parameters.fogExp2 ) ? '#define FOG_EXP2' : '',

				parameters.map ? '#define USE_MAP' : '',
				parameters.matcap ? '#define USE_MATCAP' : '',
				parameters.envMap ? '#define USE_ENVMAP' : '',
				parameters.envMap ? '#define ' + envMapTypeDefine : '',
				parameters.envMap ? '#define ' + envMapModeDefine : '',
				parameters.envMap ? '#define ' + envMapBlendingDefine : '',
				parameters.lightMap ? '#define USE_LIGHTMAP' : '',
				parameters.aoMap ? '#define USE_AOMAP' : '',
				parameters.emissiveMap ? '#define USE_EMISSIVEMAP' : '',
				parameters.bumpMap ? '#define USE_BUMPMAP' : '',
				parameters.normalMap ? '#define USE_NORMALMAP' : '',
				( parameters.normalMap && parameters.objectSpaceNormalMap ) ? '#define OBJECTSPACE_NORMALMAP' : '',
				( parameters.normalMap && parameters.tangentSpaceNormalMap ) ? '#define TANGENTSPACE_NORMALMAP' : '',
				parameters.clearcoatNormalMap ? '#define USE_CLEARCOAT_NORMALMAP' : '',
				parameters.specularMap ? '#define USE_SPECULARMAP' : '',
				parameters.roughnessMap ? '#define USE_ROUGHNESSMAP' : '',
				parameters.metalnessMap ? '#define USE_METALNESSMAP' : '',
				parameters.alphaMap ? '#define USE_ALPHAMAP' : '',

				parameters.sheen ? '#define USE_SHEEN' : '',

				parameters.vertexTangents ? '#define USE_TANGENT' : '',
				parameters.vertexColors ? '#define USE_COLOR' : '',
				parameters.vertexUvs ? '#define USE_UV' : '',
				parameters.uvsVertexOnly ? '#define UVS_VERTEX_ONLY' : '',

				parameters.gradientMap ? '#define USE_GRADIENTMAP' : '',

				parameters.flatShading ? '#define FLAT_SHADED' : '',

				parameters.doubleSided ? '#define DOUBLE_SIDED' : '',
				parameters.flipSided ? '#define FLIP_SIDED' : '',

				parameters.shadowMapEnabled ? '#define USE_SHADOWMAP' : '',
				parameters.shadowMapEnabled ? '#define ' + shadowMapTypeDefine : '',

				parameters.premultipliedAlpha ? '#define PREMULTIPLIED_ALPHA' : '',

				parameters.physicallyCorrectLights ? '#define PHYSICALLY_CORRECT_LIGHTS' : '',

				parameters.logarithmicDepthBuffer ? '#define USE_LOGDEPTHBUF' : '',
				( parameters.logarithmicDepthBuffer && parameters.rendererExtensionFragDepth ) ? '#define USE_LOGDEPTHBUF_EXT' : '',

				( ( parameters.extensionShaderTextureLOD || parameters.envMap ) && parameters.rendererExtensionShaderTextureLod ) ? '#define TEXTURE_LOD_EXT' : '',

				'uniform mat4 viewMatrix;',
				'uniform vec3 cameraPosition;',
				'uniform bool isOrthographic;',

				( parameters.toneMapping !== NoToneMapping ) ? '#define TONE_MAPPING' : '',
				( parameters.toneMapping !== NoToneMapping ) ? ShaderChunk[ 'tonemapping_pars_fragment' ] : '', // this code is required here because it is used by the toneMapping() function defined below
				( parameters.toneMapping !== NoToneMapping ) ? getToneMappingFunction( 'toneMapping', parameters.toneMapping ) : '',

				parameters.dithering ? '#define DITHERING' : '',
				parameters.transparent ? '#define TRANSPARENT' : '',

				( parameters.outputEncoding || parameters.mapEncoding || parameters.matcapEncoding || parameters.envMapEncoding || parameters.emissiveMapEncoding || parameters.lightMapEncoding ) ?
					ShaderChunk[ 'encodings_pars_fragment' ] : '', // this code is required here because it is used by the various encoding/decoding function defined below
				parameters.mapEncoding ? getTexelDecodingFunction( 'mapTexelToLinear', parameters.mapEncoding ) : '',
				parameters.matcapEncoding ? getTexelDecodingFunction( 'matcapTexelToLinear', parameters.matcapEncoding ) : '',
				parameters.envMapEncoding ? getTexelDecodingFunction( 'envMapTexelToLinear', parameters.envMapEncoding ) : '',
				parameters.emissiveMapEncoding ? getTexelDecodingFunction( 'emissiveMapTexelToLinear', parameters.emissiveMapEncoding ) : '',
				parameters.lightMapEncoding ? getTexelDecodingFunction( 'lightMapTexelToLinear', parameters.lightMapEncoding ) : '',
				parameters.outputEncoding ? getTexelEncodingFunction( 'linearToOutputTexel', parameters.outputEncoding ) : '',

				parameters.depthPacking ? '#define DEPTH_PACKING ' + parameters.depthPacking : '',

				'\n'

			].filter( filterEmptyLine ).join( '\n' );

		}

		vertexShader = resolveIncludes( vertexShader );
		vertexShader = replaceLightNums( vertexShader, parameters );
		vertexShader = replaceClippingPlaneNums( vertexShader, parameters );

		fragmentShader = resolveIncludes( fragmentShader );
		fragmentShader = replaceLightNums( fragmentShader, parameters );
		fragmentShader = replaceClippingPlaneNums( fragmentShader, parameters );

		vertexShader = unrollLoops( vertexShader );
		fragmentShader = unrollLoops( fragmentShader );

		if ( parameters.isWebGL2 && ! parameters.isRawShaderMaterial ) {

			var isGLSL3ShaderMaterial = false;

			var versionRegex = /^\s*#version\s+300\s+es\s*\n/;

			if ( parameters.isShaderMaterial &&
				vertexShader.match( versionRegex ) !== null &&
				fragmentShader.match( versionRegex ) !== null ) {

				isGLSL3ShaderMaterial = true;

				vertexShader = vertexShader.replace( versionRegex, '' );
				fragmentShader = fragmentShader.replace( versionRegex, '' );

			}

			// GLSL 3.0 conversion

			prefixVertex = [
				'#version 300 es\n',
				'#define attribute in',
				'#define varying out',
				'#define texture2D texture'
			].join( '\n' ) + '\n' + prefixVertex;

			prefixFragment = [
				'#version 300 es\n',
				'#define varying in',
				isGLSL3ShaderMaterial ? '' : 'out highp vec4 pc_fragColor;',
				isGLSL3ShaderMaterial ? '' : '#define gl_FragColor pc_fragColor',
				'#define gl_FragDepthEXT gl_FragDepth',
				'#define texture2D texture',
				'#define textureCube texture',
				'#define texture2DProj textureProj',
				'#define texture2DLodEXT textureLod',
				'#define texture2DProjLodEXT textureProjLod',
				'#define textureCubeLodEXT textureLod',
				'#define texture2DGradEXT textureGrad',
				'#define texture2DProjGradEXT textureProjGrad',
				'#define textureCubeGradEXT textureGrad'
			].join( '\n' ) + '\n' + prefixFragment;

			// Multiview

			if ( numMultiviewViews > 0 ) {

				prefixVertex = prefixVertex.replace(
					'#version 300 es\n',
					[
						'#version 300 es\n',
						'#extension GL_OVR_multiview2 : require',
						'layout(num_views = ' + numMultiviewViews + ') in;',
						'#define VIEW_ID gl_ViewID_OVR'
					].join( '\n' )
				);

				prefixVertex = prefixVertex.replace(
					[
						'uniform mat4 modelViewMatrix;',
						'uniform mat4 projectionMatrix;',
						'uniform mat4 viewMatrix;',
						'uniform mat3 normalMatrix;'
					].join( '\n' ),
					[
						'uniform mat4 modelViewMatrices[' + numMultiviewViews + '];',
						'uniform mat4 projectionMatrices[' + numMultiviewViews + '];',
						'uniform mat4 viewMatrices[' + numMultiviewViews + '];',
						'uniform mat3 normalMatrices[' + numMultiviewViews + '];',

						'#define modelViewMatrix modelViewMatrices[VIEW_ID]',
						'#define projectionMatrix projectionMatrices[VIEW_ID]',
						'#define viewMatrix viewMatrices[VIEW_ID]',
						'#define normalMatrix normalMatrices[VIEW_ID]'
					].join( '\n' )
				);

				prefixFragment = prefixFragment.replace(
					'#version 300 es\n',
					[
						'#version 300 es\n',
						'#extension GL_OVR_multiview2 : require',
						'#define VIEW_ID gl_ViewID_OVR'
					].join( '\n' )
				);

				prefixFragment = prefixFragment.replace(
					'uniform mat4 viewMatrix;',
					[
						'uniform mat4 viewMatrices[' + numMultiviewViews + '];',
						'#define viewMatrix viewMatrices[VIEW_ID]'
					].join( '\n' )
				);

			}

		}

		var vertexGlsl = prefixVertex + vertexShader;
		var fragmentGlsl = prefixFragment + fragmentShader;

		// console.log( '*VERTEX*', vertexGlsl );
		// console.log( '*FRAGMENT*', fragmentGlsl );

		var glVertexShader = WebGLShader( gl, 35633, vertexGlsl );
		var glFragmentShader = WebGLShader( gl, 35632, fragmentGlsl );

		gl.attachShader( program, glVertexShader );
		gl.attachShader( program, glFragmentShader );

		// Force a particular attribute to index 0.

		if ( parameters.index0AttributeName !== undefined ) {

			gl.bindAttribLocation( program, 0, parameters.index0AttributeName );

		} else if ( parameters.morphTargets === true ) {

			// programs with morphTargets displace position out of attribute 0
			gl.bindAttribLocation( program, 0, 'position' );

		}

		gl.linkProgram( program );

		// check for link errors
		if ( renderer.debug.checkShaderErrors ) {

			var programLog = gl.getProgramInfoLog( program ).trim();
			var vertexLog = gl.getShaderInfoLog( glVertexShader ).trim();
			var fragmentLog = gl.getShaderInfoLog( glFragmentShader ).trim();

			var runnable = true;
			var haveDiagnostics = true;

			if ( gl.getProgramParameter( program, 35714 ) === false ) {

				runnable = false;

				var vertexErrors = getShaderErrors( gl, glVertexShader, 'vertex' );
				var fragmentErrors = getShaderErrors( gl, glFragmentShader, 'fragment' );

				console.error( 'THREE.WebGLProgram: shader error: ', gl.getError(), '35715', gl.getProgramParameter( program, 35715 ), 'gl.getProgramInfoLog', programLog, vertexErrors, fragmentErrors );

			} else if ( programLog !== '' ) {

				console.warn( 'THREE.WebGLProgram: gl.getProgramInfoLog()', programLog );

			} else if ( vertexLog === '' || fragmentLog === '' ) {

				haveDiagnostics = false;

			}

			if ( haveDiagnostics ) {

				this.diagnostics = {

					runnable: runnable,

					programLog: programLog,

					vertexShader: {

						log: vertexLog,
						prefix: prefixVertex

					},

					fragmentShader: {

						log: fragmentLog,
						prefix: prefixFragment

					}

				};

			}

		}

		// clean up

		gl.detachShader( program, glVertexShader );
		gl.detachShader( program, glFragmentShader );

		gl.deleteShader( glVertexShader );
		gl.deleteShader( glFragmentShader );

		// set up caching for uniform locations

		var cachedUniforms;

		this.getUniforms = function () {

			if ( cachedUniforms === undefined ) {

				cachedUniforms = new WebGLUniforms( gl, program );

			}

			return cachedUniforms;

		};

		// set up caching for attribute locations

		var cachedAttributes;

		this.getAttributes = function () {

			if ( cachedAttributes === undefined ) {

				cachedAttributes = fetchAttributeLocations( gl, program );

			}

			return cachedAttributes;

		};

		// free resource

		this.destroy = function () {

			gl.deleteProgram( program );
			this.program = undefined;

		};

		//

		this.name = parameters.shaderName;
		this.id = programIdCount ++;
		this.cacheKey = cacheKey;
		this.usedTimes = 1;
		this.program = program;
		this.vertexShader = glVertexShader;
		this.fragmentShader = glFragmentShader;
		this.numMultiviewViews = numMultiviewViews;

		return this;

	}

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function WebGLPrograms( renderer, extensions, capabilities ) {

		var programs = [];

		var isWebGL2 = capabilities.isWebGL2;
		var logarithmicDepthBuffer = capabilities.logarithmicDepthBuffer;
		var floatVertexTextures = capabilities.floatVertexTextures;
		var precision = capabilities.precision;
		var maxVertexUniforms = capabilities.maxVertexUniforms;
		var vertexTextures = capabilities.vertexTextures;

		var shaderIDs = {
			MeshDepthMaterial: 'depth',
			MeshDistanceMaterial: 'distanceRGBA',
			MeshNormalMaterial: 'normal',
			MeshBasicMaterial: 'basic',
			MeshLambertMaterial: 'lambert',
			MeshPhongMaterial: 'phong',
			MeshToonMaterial: 'toon',
			MeshStandardMaterial: 'physical',
			MeshPhysicalMaterial: 'physical',
			MeshMatcapMaterial: 'matcap',
			LineBasicMaterial: 'basic',
			LineDashedMaterial: 'dashed',
			PointsMaterial: 'points',
			ShadowMaterial: 'shadow',
			SpriteMaterial: 'sprite'
		};

		var parameterNames = [
			"precision", "isWebGL2", "supportsVertexTextures", "outputEncoding", "instancing", "numMultiviewViews",
			"map", "mapEncoding", "matcap", "matcapEncoding", "envMap", "envMapMode", "envMapEncoding", "envMapCubeUV",
			"lightMap", "lightMapEncoding", "aoMap", "emissiveMap", "emissiveMapEncoding", "bumpMap", "normalMap", "objectSpaceNormalMap", "tangentSpaceNormalMap", "clearcoatNormalMap", "displacementMap", "specularMap",
			"roughnessMap", "metalnessMap", "gradientMap",
			"alphaMap", "combine", "vertexColors", "vertexTangents", "vertexUvs", "uvsVertexOnly", "fog", "useFog", "fogExp2",
			"flatShading", "sizeAttenuation", "logarithmicDepthBuffer", "skinning",
			"maxBones", "useVertexTexture", "morphTargets", "morphNormals",
			"maxMorphTargets", "maxMorphNormals", "premultipliedAlpha",
			"numDirLights", "numPointLights", "numSpotLights", "numHemiLights", "numRectAreaLights",
			"numDirLightShadows", "numPointLightShadows", "numSpotLightShadows",
			"shadowMapEnabled", "shadowMapType", "toneMapping", 'physicallyCorrectLights',
			"alphaTest", "doubleSided", "flipSided", "numClippingPlanes", "numClipIntersection", "depthPacking", "dithering",
			"sheen", "transparent"
		];

		function getShaderObject( material, shaderID ) {

			var shaderobject;

			if ( shaderID ) {

				var shader = ShaderLib[ shaderID ];

				shaderobject = {
					name: material.type,
					uniforms: UniformsUtils.clone( shader.uniforms ),
					vertexShader: shader.vertexShader,
					fragmentShader: shader.fragmentShader
				};

			} else {

				shaderobject = {
					name: material.type,
					uniforms: material.uniforms,
					vertexShader: material.vertexShader,
					fragmentShader: material.fragmentShader
				};

			}

			return shaderobject;

		}

		function allocateBones( object ) {

			var skeleton = object.skeleton;
			var bones = skeleton.bones;

			if ( floatVertexTextures ) {

				return 1024;

			} else {

				// default for when object is not specified
				// ( for example when prebuilding shader to be used with multiple objects )
				//
				//  - leave some extra space for other uniforms
				//  - limit here is ANGLE's 254 max uniform vectors
				//    (up to 54 should be safe)

				var nVertexUniforms = maxVertexUniforms;
				var nVertexMatrices = Math.floor( ( nVertexUniforms - 20 ) / 4 );

				var maxBones = Math.min( nVertexMatrices, bones.length );

				if ( maxBones < bones.length ) {

					console.warn( 'THREE.WebGLRenderer: Skeleton has ' + bones.length + ' bones. This GPU supports ' + maxBones + '.' );
					return 0;

				}

				return maxBones;

			}

		}

		function getTextureEncodingFromMap( map ) {

			var encoding;

			if ( ! map ) {

				encoding = LinearEncoding;

			} else if ( map.isTexture ) {

				encoding = map.encoding;

			} else if ( map.isWebGLRenderTarget ) {

				console.warn( "THREE.WebGLPrograms.getTextureEncodingFromMap: don't use render targets as textures. Use their .texture property instead." );
				encoding = map.texture.encoding;

			}

			return encoding;

		}

		this.getParameters = function ( material, lights, shadows, scene, nClipPlanes, nClipIntersection, object ) {

			var fog = scene.fog;
			var environment = material.isMeshStandardMaterial ? scene.environment : null;

			var envMap = material.envMap || environment;

			var shaderID = shaderIDs[ material.type ];

			// heuristics to create shader parameters according to lights in the scene
			// (not to blow over maxLights budget)

			var maxBones = object.isSkinnedMesh ? allocateBones( object ) : 0;

			if ( material.precision !== null ) {

				precision = capabilities.getMaxPrecision( material.precision );

				if ( precision !== material.precision ) {

					console.warn( 'THREE.WebGLProgram.getParameters:', material.precision, 'not supported, using', precision, 'instead.' );

				}

			}

			var shaderobject = getShaderObject( material, shaderID );
			material.onBeforeCompile( shaderobject, renderer );

			var currentRenderTarget = renderer.getRenderTarget();
			var numMultiviewViews = currentRenderTarget && currentRenderTarget.isWebGLMultiviewRenderTarget ? currentRenderTarget.numViews : 0;

			var parameters = {

				isWebGL2: isWebGL2,

				shaderID: shaderID,
				shaderName: shaderobject.name,

				uniforms: shaderobject.uniforms,
				vertexShader: shaderobject.vertexShader,
				fragmentShader: shaderobject.fragmentShader,
				defines: material.defines,

				isRawShaderMaterial: material.isRawShaderMaterial,
				isShaderMaterial: material.isShaderMaterial,

				precision: precision,

				instancing: object.isInstancedMesh === true,

				supportsVertexTextures: vertexTextures,
				numMultiviewViews: numMultiviewViews,
				outputEncoding: ( currentRenderTarget !== null ) ? getTextureEncodingFromMap( currentRenderTarget.texture ) : renderer.outputEncoding,
				map: !! material.map,
				mapEncoding: getTextureEncodingFromMap( material.map ),
				matcap: !! material.matcap,
				matcapEncoding: getTextureEncodingFromMap( material.matcap ),
				envMap: !! envMap,
				envMapMode: envMap && envMap.mapping,
				envMapEncoding: getTextureEncodingFromMap( envMap ),
				envMapCubeUV: ( !! envMap ) && ( ( envMap.mapping === CubeUVReflectionMapping ) || ( envMap.mapping === CubeUVRefractionMapping ) ),
				lightMap: !! material.lightMap,
				lightMapEncoding: getTextureEncodingFromMap( material.lightMap ),
				aoMap: !! material.aoMap,
				emissiveMap: !! material.emissiveMap,
				emissiveMapEncoding: getTextureEncodingFromMap( material.emissiveMap ),
				bumpMap: !! material.bumpMap,
				normalMap: !! material.normalMap,
				objectSpaceNormalMap: material.normalMapType === ObjectSpaceNormalMap,
				tangentSpaceNormalMap: material.normalMapType === TangentSpaceNormalMap,
				clearcoatNormalMap: !! material.clearcoatNormalMap,
				displacementMap: !! material.displacementMap,
				roughnessMap: !! material.roughnessMap,
				metalnessMap: !! material.metalnessMap,
				specularMap: !! material.specularMap,
				alphaMap: !! material.alphaMap,

				gradientMap: !! material.gradientMap,

				sheen: !! material.sheen,

				combine: material.combine,

				vertexTangents: ( material.normalMap && material.vertexTangents ),
				vertexColors: material.vertexColors,
				vertexUvs: !! material.map || !! material.bumpMap || !! material.normalMap || !! material.specularMap || !! material.alphaMap || !! material.emissiveMap || !! material.roughnessMap || !! material.metalnessMap || !! material.clearcoatNormalMap || !! material.displacementMap,
				uvsVertexOnly: ! ( !! material.map || !! material.bumpMap || !! material.normalMap || !! material.specularMap || !! material.alphaMap || !! material.emissiveMap || !! material.roughnessMap || !! material.metalnessMap || !! material.clearcoatNormalMap ) && !! material.displacementMap,

				fog: !! fog,
				useFog: material.fog,
				fogExp2: ( fog && fog.isFogExp2 ),

				flatShading: material.flatShading,

				sizeAttenuation: material.sizeAttenuation,
				logarithmicDepthBuffer: logarithmicDepthBuffer,

				skinning: material.skinning && maxBones > 0,
				maxBones: maxBones,
				useVertexTexture: floatVertexTextures,

				morphTargets: material.morphTargets,
				morphNormals: material.morphNormals,
				maxMorphTargets: renderer.maxMorphTargets,
				maxMorphNormals: renderer.maxMorphNormals,

				numDirLights: lights.directional.length,
				numPointLights: lights.point.length,
				numSpotLights: lights.spot.length,
				numRectAreaLights: lights.rectArea.length,
				numHemiLights: lights.hemi.length,

				numDirLightShadows: lights.directionalShadowMap.length,
				numPointLightShadows: lights.pointShadowMap.length,
				numSpotLightShadows: lights.spotShadowMap.length,

				numClippingPlanes: nClipPlanes,
				numClipIntersection: nClipIntersection,

				dithering: material.dithering,
				transparent: material.transparent,

				shadowMapEnabled: renderer.shadowMap.enabled && shadows.length > 0,
				shadowMapType: renderer.shadowMap.type,

				toneMapping: material.toneMapped ? renderer.toneMapping : NoToneMapping,
				physicallyCorrectLights: renderer.physicallyCorrectLights,

				premultipliedAlpha: material.premultipliedAlpha,

				alphaTest: material.alphaTest,
				doubleSided: material.side === DoubleSide,
				flipSided: material.side === BackSide,

				depthPacking: ( material.depthPacking !== undefined ) ? material.depthPacking : false,

				index0AttributeName: material.index0AttributeName,

				extensionDerivatives: material.extensions && material.extensions.derivatives,
				extensionFragDepth: material.extensions && material.extensions.fragDepth,
				extensionDrawbuffers: material.extensions && material.extensions.drawBuffers,
				extensionShaderTextureLOD: material.extensions && material.extensions.shaderTextureLOD,

				rendererExtensionFragDepth: isWebGL2 || extensions.get( 'EXT_frag_depth' ) !== null,
				rendererExtensionDrawBuffers: isWebGL2 || extensions.get( 'WEBGL_draw_buffers' ) !== null,
				rendererExtensionShaderTextureLod: isWebGL2 || extensions.get( 'EXT_shader_texture_lod' ) !== null,

				onBeforeCompile: material.onBeforeCompile

			};

			return parameters;

		};

		this.getProgramCacheKey = function ( parameters ) {

			var array = [];

			if ( parameters.shaderID ) {

				array.push( parameters.shaderID );

			} else {

				array.push( parameters.fragmentShader );
				array.push( parameters.vertexShader );

			}

			if ( parameters.defines !== undefined ) {

				for ( var name in parameters.defines ) {

					array.push( name );
					array.push( parameters.defines[ name ] );

				}

			}

			if ( parameters.isRawShaderMaterial === undefined ) {

				for ( var i = 0; i < parameterNames.length; i ++ ) {

					array.push( parameters[ parameterNames[ i ] ] );

				}

				array.push( renderer.outputEncoding );
				array.push( renderer.gammaFactor );

			}

			array.push( parameters.onBeforeCompile.toString() );

			return array.join();

		};

		this.acquireProgram = function ( parameters, cacheKey ) {

			var program;

			// Check if code has been already compiled
			for ( var p = 0, pl = programs.length; p < pl; p ++ ) {

				var preexistingProgram = programs[ p ];

				if ( preexistingProgram.cacheKey === cacheKey ) {

					program = preexistingProgram;
					++ program.usedTimes;

					break;

				}

			}

			if ( program === undefined ) {

				program = new WebGLProgram( renderer, cacheKey, parameters );
				programs.push( program );

			}

			return program;

		};

		this.releaseProgram = function ( program ) {

			if ( -- program.usedTimes === 0 ) {

				// Remove from unordered set
				var i = programs.indexOf( program );
				programs[ i ] = programs[ programs.length - 1 ];
				programs.pop();

				// Free WebGL resources
				program.destroy();

			}

		};

		// Exposed for resource monitoring & error feedback via renderer.info:
		this.programs = programs;

	}

	/**
	 * @author fordacious / fordacious.github.io
	 */

	function WebGLProperties() {

		var properties = new WeakMap();

		function get( object ) {

			var map = properties.get( object );

			if ( map === undefined ) {

				map = {};
				properties.set( object, map );

			}

			return map;

		}

		function remove( object ) {

			properties.delete( object );

		}

		function update( object, key, value ) {

			properties.get( object )[ key ] = value;

		}

		function dispose() {

			properties = new WeakMap();

		}

		return {
			get: get,
			remove: remove,
			update: update,
			dispose: dispose
		};

	}

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	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.program !== b.program ) {

			return a.program.id - b.program.id;

		} 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;

		}

	}


	function WebGLRenderList() {

		var renderItems = [];
		var renderItemsIndex = 0;

		var opaque = [];
		var transparent = [];

		var defaultProgram = { id: - 1 };

		function init() {

			renderItemsIndex = 0;

			opaque.length = 0;
			transparent.length = 0;

		}

		function getNextRenderItem( object, geometry, material, groupOrder, z, group ) {

			var renderItem = renderItems[ renderItemsIndex ];

			if ( renderItem === undefined ) {

				renderItem = {
					id: object.id,
					object: object,
					geometry: geometry,
					material: material,
					program: material.program || defaultProgram,
					groupOrder: groupOrder,
					renderOrder: object.renderOrder,
					z: z,
					group: group
				};

				renderItems[ renderItemsIndex ] = renderItem;

			} else {

				renderItem.id = object.id;
				renderItem.object = object;
				renderItem.geometry = geometry;
				renderItem.material = material;
				renderItem.program = material.program || defaultProgram;
				renderItem.groupOrder = groupOrder;
				renderItem.renderOrder = object.renderOrder;
				renderItem.z = z;
				renderItem.group = group;

			}

			renderItemsIndex ++;

			return renderItem;

		}

		function push( object, geometry, material, groupOrder, z, group ) {

			var renderItem = getNextRenderItem( object, geometry, material, groupOrder, z, group );

			( material.transparent === true ? transparent : opaque ).push( renderItem );

		}

		function unshift( object, geometry, material, groupOrder, z, group ) {

			var renderItem = getNextRenderItem( object, geometry, material, groupOrder, z, group );

			( material.transparent === true ? transparent : opaque ).unshift( renderItem );

		}

		function sort( customOpaqueSort, customTransparentSort ) {

			if ( opaque.length > 1 ) { opaque.sort( customOpaqueSort || painterSortStable ); }
			if ( transparent.length > 1 ) { transparent.sort( customTransparentSort || reversePainterSortStable ); }

		}

		function finish() {

			// Clear references from inactive renderItems in the list

			for ( var i = renderItemsIndex, il = renderItems.length; i < il; i ++ ) {

				var renderItem = renderItems[ i ];

				if ( renderItem.id === null ) { break; }

				renderItem.id = null;
				renderItem.object = null;
				renderItem.geometry = null;
				renderItem.material = null;
				renderItem.program = null;
				renderItem.group = null;

			}

		}

		return {
			opaque: opaque,
			transparent: transparent,

			init: init,
			push: push,
			unshift: unshift,
			finish: finish,

			sort: sort
		};

	}

	function WebGLRenderLists() {

		var lists = new WeakMap();

		function onSceneDispose( event ) {

			var scene = event.target;

			scene.removeEventListener( 'dispose', onSceneDispose );

			lists.delete( scene );

		}

		function get( scene, camera ) {

			var cameras = lists.get( scene );
			var list;
			if ( cameras === undefined ) {

				list = new WebGLRenderList();
				lists.set( scene, new WeakMap() );
				lists.get( scene ).set( camera, list );

				scene.addEventListener( 'dispose', onSceneDispose );

			} else {

				list = cameras.get( camera );
				if ( list === undefined ) {

					list = new WebGLRenderList();
					cameras.set( camera, list );

				}

			}

			return list;

		}

		function dispose() {

			lists = new WeakMap();

		}

		return {
			get: get,
			dispose: dispose
		};

	}

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function UniformsCache() {

		var lights = {};

		return {

			get: function ( light ) {

				if ( lights[ light.id ] !== undefined ) {

					return lights[ light.id ];

				}

				var uniforms;

				switch ( light.type ) {

					case 'DirectionalLight':
						uniforms = {
							direction: new Vector3(),
							color: new Color()
						};
						break;

					case 'SpotLight':
						uniforms = {
							position: new Vector3(),
							direction: new Vector3(),
							color: new Color(),
							distance: 0,
							coneCos: 0,
							penumbraCos: 0,
							decay: 0
						};
						break;

					case 'PointLight':
						uniforms = {
							position: new Vector3(),
							color: new Color(),
							distance: 0,
							decay: 0
						};
						break;

					case 'HemisphereLight':
						uniforms = {
							direction: new Vector3(),
							skyColor: new Color(),
							groundColor: new Color()
						};
						break;

					case 'RectAreaLight':
						uniforms = {
							color: new Color(),
							position: new Vector3(),
							halfWidth: new Vector3(),
							halfHeight: new Vector3()
						};
						break;

				}

				lights[ light.id ] = uniforms;

				return uniforms;

			}

		};

	}

	function ShadowUniformsCache() {

		var lights = {};

		return {

			get: function ( light ) {

				if ( lights[ light.id ] !== undefined ) {

					return lights[ light.id ];

				}

				var uniforms;

				switch ( light.type ) {

					case 'DirectionalLight':
						uniforms = {
							shadowBias: 0,
							shadowRadius: 1,
							shadowMapSize: new Vector2()
						};
						break;

					case 'SpotLight':
						uniforms = {
							shadowBias: 0,
							shadowRadius: 1,
							shadowMapSize: new Vector2()
						};
						break;

					case 'PointLight':
						uniforms = {
							shadowBias: 0,
							shadowRadius: 1,
							shadowMapSize: new Vector2(),
							shadowCameraNear: 1,
							shadowCameraFar: 1000
						};
						break;

					// TODO (abelnation): set RectAreaLight shadow uniforms

				}

				lights[ light.id ] = uniforms;

				return uniforms;

			}

		};

	}



	var nextVersion = 0;

	function shadowCastingLightsFirst( lightA, lightB ) {

		return ( lightB.castShadow ? 1 : 0 ) - ( lightA.castShadow ? 1 : 0 );

	}

	function WebGLLights() {

		var cache = new UniformsCache();

		var shadowCache = ShadowUniformsCache();

		var state = {

			version: 0,

			hash: {
				directionalLength: - 1,
				pointLength: - 1,
				spotLength: - 1,
				rectAreaLength: - 1,
				hemiLength: - 1,

				numDirectionalShadows: - 1,
				numPointShadows: - 1,
				numSpotShadows: - 1
			},

			ambient: [ 0, 0, 0 ],
			probe: [],
			directional: [],
			directionalShadow: [],
			directionalShadowMap: [],
			directionalShadowMatrix: [],
			spot: [],
			spotShadow: [],
			spotShadowMap: [],
			spotShadowMatrix: [],
			rectArea: [],
			point: [],
			pointShadow: [],
			pointShadowMap: [],
			pointShadowMatrix: [],
			hemi: []

		};

		for ( var i = 0; i < 9; i ++ ) { state.probe.push( new Vector3() ); }

		var vector3 = new Vector3();
		var matrix4 = new Matrix4();
		var matrix42 = new Matrix4();

		function setup( lights, shadows, camera ) {

			var r = 0, g = 0, b = 0;

			for ( var i = 0; i < 9; i ++ ) { state.probe[ i ].set( 0, 0, 0 ); }

			var directionalLength = 0;
			var pointLength = 0;
			var spotLength = 0;
			var rectAreaLength = 0;
			var hemiLength = 0;

			var numDirectionalShadows = 0;
			var numPointShadows = 0;
			var numSpotShadows = 0;

			var viewMatrix = camera.matrixWorldInverse;

			lights.sort( shadowCastingLightsFirst );

			for ( var i = 0, l = lights.length; i < l; i ++ ) {

				var light = lights[ i ];

				var color = light.color;
				var intensity = light.intensity;
				var distance = light.distance;

				var shadowMap = ( light.shadow && light.shadow.map ) ? light.shadow.map.texture : null;

				if ( light.isAmbientLight ) {

					r += color.r * intensity;
					g += color.g * intensity;
					b += color.b * intensity;

				} else if ( light.isLightProbe ) {

					for ( var j = 0; j < 9; j ++ ) {

						state.probe[ j ].addScaledVector( light.sh.coefficients[ j ], intensity );

					}

				} else if ( light.isDirectionalLight ) {

					var uniforms = cache.get( light );

					uniforms.color.copy( light.color ).multiplyScalar( light.intensity );
					uniforms.direction.setFromMatrixPosition( light.matrixWorld );
					vector3.setFromMatrixPosition( light.target.matrixWorld );
					uniforms.direction.sub( vector3 );
					uniforms.direction.transformDirection( viewMatrix );

					if ( light.castShadow ) {

						var shadow = light.shadow;

						var shadowUniforms = shadowCache.get( light );

						shadowUniforms.shadowBias = shadow.bias;
						shadowUniforms.shadowRadius = shadow.radius;
						shadowUniforms.shadowMapSize = shadow.mapSize;

						state.directionalShadow[ directionalLength ] = shadowUniforms;
						state.directionalShadowMap[ directionalLength ] = shadowMap;
						state.directionalShadowMatrix[ directionalLength ] = light.shadow.matrix;

						numDirectionalShadows ++;

					}

					state.directional[ directionalLength ] = uniforms;

					directionalLength ++;

				} else if ( light.isSpotLight ) {

					var uniforms = cache.get( light );

					uniforms.position.setFromMatrixPosition( light.matrixWorld );
					uniforms.position.applyMatrix4( viewMatrix );

					uniforms.color.copy( color ).multiplyScalar( intensity );
					uniforms.distance = distance;

					uniforms.direction.setFromMatrixPosition( light.matrixWorld );
					vector3.setFromMatrixPosition( light.target.matrixWorld );
					uniforms.direction.sub( vector3 );
					uniforms.direction.transformDirection( viewMatrix );

					uniforms.coneCos = Math.cos( light.angle );
					uniforms.penumbraCos = Math.cos( light.angle * ( 1 - light.penumbra ) );
					uniforms.decay = light.decay;

					if ( light.castShadow ) {

						var shadow = light.shadow;

						var shadowUniforms = shadowCache.get( light );

						shadowUniforms.shadowBias = shadow.bias;
						shadowUniforms.shadowRadius = shadow.radius;
						shadowUniforms.shadowMapSize = shadow.mapSize;

						state.spotShadow[ spotLength ] = shadowUniforms;
						state.spotShadowMap[ spotLength ] = shadowMap;
						state.spotShadowMatrix[ spotLength ] = light.shadow.matrix;

						numSpotShadows ++;

					}

					state.spot[ spotLength ] = uniforms;

					spotLength ++;

				} else if ( light.isRectAreaLight ) {

					var uniforms = cache.get( light );

					// (a) intensity is the total visible light emitted
					//uniforms.color.copy( color ).multiplyScalar( intensity / ( light.width * light.height * Math.PI ) );

					// (b) intensity is the brightness of the light
					uniforms.color.copy( color ).multiplyScalar( intensity );

					uniforms.position.setFromMatrixPosition( light.matrixWorld );
					uniforms.position.applyMatrix4( viewMatrix );

					// extract local rotation of light to derive width/height half vectors
					matrix42.identity();
					matrix4.copy( light.matrixWorld );
					matrix4.premultiply( viewMatrix );
					matrix42.extractRotation( matrix4 );

					uniforms.halfWidth.set( light.width * 0.5, 0.0, 0.0 );
					uniforms.halfHeight.set( 0.0, light.height * 0.5, 0.0 );

					uniforms.halfWidth.applyMatrix4( matrix42 );
					uniforms.halfHeight.applyMatrix4( matrix42 );

					// TODO (abelnation): RectAreaLight distance?
					// uniforms.distance = distance;

					state.rectArea[ rectAreaLength ] = uniforms;

					rectAreaLength ++;

				} else if ( light.isPointLight ) {

					var uniforms = cache.get( light );

					uniforms.position.setFromMatrixPosition( light.matrixWorld );
					uniforms.position.applyMatrix4( viewMatrix );

					uniforms.color.copy( light.color ).multiplyScalar( light.intensity );
					uniforms.distance = light.distance;
					uniforms.decay = light.decay;

					if ( light.castShadow ) {

						var shadow = light.shadow;

						var shadowUniforms = shadowCache.get( light );

						shadowUniforms.shadowBias = shadow.bias;
						shadowUniforms.shadowRadius = shadow.radius;
						shadowUniforms.shadowMapSize = shadow.mapSize;
						shadowUniforms.shadowCameraNear = shadow.camera.near;
						shadowUniforms.shadowCameraFar = shadow.camera.far;

						state.pointShadow[ pointLength ] = shadowUniforms;
						state.pointShadowMap[ pointLength ] = shadowMap;
						state.pointShadowMatrix[ pointLength ] = light.shadow.matrix;

						numPointShadows ++;

					}

					state.point[ pointLength ] = uniforms;

					pointLength ++;

				} else if ( light.isHemisphereLight ) {

					var uniforms = cache.get( light );

					uniforms.direction.setFromMatrixPosition( light.matrixWorld );
					uniforms.direction.transformDirection( viewMatrix );
					uniforms.direction.normalize();

					uniforms.skyColor.copy( light.color ).multiplyScalar( intensity );
					uniforms.groundColor.copy( light.groundColor ).multiplyScalar( intensity );

					state.hemi[ hemiLength ] = uniforms;

					hemiLength ++;

				}

			}

			state.ambient[ 0 ] = r;
			state.ambient[ 1 ] = g;
			state.ambient[ 2 ] = b;

			var hash = state.hash;

			if ( hash.directionalLength !== directionalLength ||
				hash.pointLength !== pointLength ||
				hash.spotLength !== spotLength ||
				hash.rectAreaLength !== rectAreaLength ||
				hash.hemiLength !== hemiLength ||
				hash.numDirectionalShadows !== numDirectionalShadows ||
				hash.numPointShadows !== numPointShadows ||
				hash.numSpotShadows !== numSpotShadows ) {

				state.directional.length = directionalLength;
				state.spot.length = spotLength;
				state.rectArea.length = rectAreaLength;
				state.point.length = pointLength;
				state.hemi.length = hemiLength;

				state.directionalShadow.length = numDirectionalShadows;
				state.directionalShadowMap.length = numDirectionalShadows;
				state.pointShadow.length = numPointShadows;
				state.pointShadowMap.length = numPointShadows;
				state.spotShadow.length = numSpotShadows;
				state.spotShadowMap.length = numSpotShadows;
				state.directionalShadowMatrix.length = numDirectionalShadows;
				state.pointShadowMatrix.length = numPointShadows;
				state.spotShadowMatrix.length = numSpotShadows;

				hash.directionalLength = directionalLength;
				hash.pointLength = pointLength;
				hash.spotLength = spotLength;
				hash.rectAreaLength = rectAreaLength;
				hash.hemiLength = hemiLength;

				hash.numDirectionalShadows = numDirectionalShadows;
				hash.numPointShadows = numPointShadows;
				hash.numSpotShadows = numSpotShadows;

				state.version = nextVersion ++;

			}

		}

		return {
			setup: setup,
			state: state
		};

	}

	/**
	 * @author Mugen87 / https://github.com/Mugen87
	 */

	function WebGLRenderState() {

		var lights = new WebGLLights();

		var lightsArray = [];
		var shadowsArray = [];

		function init() {

			lightsArray.length = 0;
			shadowsArray.length = 0;

		}

		function pushLight( light ) {

			lightsArray.push( light );

		}

		function pushShadow( shadowLight ) {

			shadowsArray.push( shadowLight );

		}

		function setupLights( camera ) {

			lights.setup( lightsArray, shadowsArray, camera );

		}

		var state = {
			lightsArray: lightsArray,
			shadowsArray: shadowsArray,

			lights: lights
		};

		return {
			init: init,
			state: state,
			setupLights: setupLights,

			pushLight: pushLight,
			pushShadow: pushShadow
		};

	}

	function WebGLRenderStates() {

		var renderStates = new WeakMap();

		function onSceneDispose( event ) {

			var scene = event.target;

			scene.removeEventListener( 'dispose', onSceneDispose );

			renderStates.delete( scene );

		}

		function get( scene, camera ) {

			var renderState;

			if ( renderStates.has( scene ) === false ) {

				renderState = new WebGLRenderState();
				renderStates.set( scene, new WeakMap() );
				renderStates.get( scene ).set( camera, renderState );

				scene.addEventListener( 'dispose', onSceneDispose );

			} else {

				if ( renderStates.get( scene ).has( camera ) === false ) {

					renderState = new WebGLRenderState();
					renderStates.get( scene ).set( camera, renderState );

				} else {

					renderState = renderStates.get( scene ).get( camera );

				}

			}

			return renderState;

		}

		function dispose() {

			renderStates = new WeakMap();

		}

		return {
			get: get,
			dispose: dispose
		};

	}

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author alteredq / http://alteredqualia.com/
	 * @author bhouston / https://clara.io
	 * @author WestLangley / http://github.com/WestLangley
	 *
	 * parameters = {
	 *
	 *  opacity: <float>,
	 *
	 *  map: new THREE.Texture( <Image> ),
	 *
	 *  alphaMap: new THREE.Texture( <Image> ),
	 *
	 *  displacementMap: new THREE.Texture( <Image> ),
	 *  displacementScale: <float>,
	 *  displacementBias: <float>,
	 *
	 *  wireframe: <boolean>,
	 *  wireframeLinewidth: <float>
	 * }
	 */

	function MeshDepthMaterial( parameters ) {

		Material.call( this );

		this.type = 'MeshDepthMaterial';

		this.depthPacking = BasicDepthPacking;

		this.skinning = false;
		this.morphTargets = false;

		this.map = null;

		this.alphaMap = null;

		this.displacementMap = null;
		this.displacementScale = 1;
		this.displacementBias = 0;

		this.wireframe = false;
		this.wireframeLinewidth = 1;

		this.fog = false;

		this.setValues( parameters );

	}

	MeshDepthMaterial.prototype = Object.create( Material.prototype );
	MeshDepthMaterial.prototype.constructor = MeshDepthMaterial;

	MeshDepthMaterial.prototype.isMeshDepthMaterial = true;

	MeshDepthMaterial.prototype.copy = function ( source ) {

		Material.prototype.copy.call( this, source );

		this.depthPacking = source.depthPacking;

		this.skinning = source.skinning;
		this.morphTargets = source.morphTargets;

		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;

	};

	/**
	 * @author WestLangley / http://github.com/WestLangley
	 *
	 * parameters = {
	 *
	 *  referencePosition: <float>,
	 *  nearDistance: <float>,
	 *  farDistance: <float>,
	 *
	 *  skinning: <bool>,
	 *  morphTargets: <bool>,
	 *
	 *  map: new THREE.Texture( <Image> ),
	 *
	 *  alphaMap: new THREE.Texture( <Image> ),
	 *
	 *  displacementMap: new THREE.Texture( <Image> ),
	 *  displacementScale: <float>,
	 *  displacementBias: <float>
	 *
	 * }
	 */

	function MeshDistanceMaterial( parameters ) {

		Material.call( this );

		this.type = 'MeshDistanceMaterial';

		this.referencePosition = new Vector3();
		this.nearDistance = 1;
		this.farDistance = 1000;

		this.skinning = false;
		this.morphTargets = false;

		this.map = null;

		this.alphaMap = null;

		this.displacementMap = null;
		this.displacementScale = 1;
		this.displacementBias = 0;

		this.fog = false;

		this.setValues( parameters );

	}

	MeshDistanceMaterial.prototype = Object.create( Material.prototype );
	MeshDistanceMaterial.prototype.constructor = MeshDistanceMaterial;

	MeshDistanceMaterial.prototype.isMeshDistanceMaterial = true;

	MeshDistanceMaterial.prototype.copy = function ( source ) {

		Material.prototype.copy.call( this, source );

		this.referencePosition.copy( source.referencePosition );
		this.nearDistance = source.nearDistance;
		this.farDistance = source.farDistance;

		this.skinning = source.skinning;
		this.morphTargets = source.morphTargets;

		this.map = source.map;

		this.alphaMap = source.alphaMap;

		this.displacementMap = source.displacementMap;
		this.displacementScale = source.displacementScale;
		this.displacementBias = source.displacementBias;

		return this;

	};

	var vsm_frag = "uniform sampler2D shadow_pass;\nuniform vec2 resolution;\nuniform float radius;\n#include <packing>\nvoid main() {\n  float mean = 0.0;\n  float squared_mean = 0.0;\n\tfloat depth = unpackRGBAToDepth( texture2D( shadow_pass, ( gl_FragCoord.xy  ) / resolution ) );\n  for ( float i = -1.0; i < 1.0 ; i += SAMPLE_RATE) {\n    #ifdef HORIZONAL_PASS\n      vec2 distribution = unpackRGBATo2Half( texture2D( shadow_pass, ( gl_FragCoord.xy + vec2( i, 0.0 ) * radius ) / resolution ) );\n      mean += distribution.x;\n      squared_mean += distribution.y * distribution.y + distribution.x * distribution.x;\n    #else\n      float depth = unpackRGBAToDepth( texture2D( shadow_pass, ( gl_FragCoord.xy + vec2( 0.0,  i )  * radius ) / resolution ) );\n      mean += depth;\n      squared_mean += depth * depth;\n    #endif\n  }\n  mean = mean * HALF_SAMPLE_RATE;\n  squared_mean = squared_mean * HALF_SAMPLE_RATE;\n  float std_dev = sqrt( squared_mean - mean * mean );\n  gl_FragColor = pack2HalfToRGBA( vec2( mean, std_dev ) );\n}";

	var vsm_vert = "void main() {\n\tgl_Position = vec4( position, 1.0 );\n}";

	/**
	 * @author alteredq / http://alteredqualia.com/
	 * @author mrdoob / http://mrdoob.com/
	 */

	function WebGLShadowMap( _renderer, _objects, maxTextureSize ) {

		var _frustum = new Frustum(),

			_shadowMapSize = new Vector2(),
			_viewportSize = new Vector2(),

			_viewport = new Vector4(),

			_depthMaterials = [],
			_distanceMaterials = [],

			_materialCache = {};

		var shadowSide = { 0: BackSide, 1: FrontSide, 2: DoubleSide };

		var shadowMaterialVertical = new ShaderMaterial( {

			defines: {
				SAMPLE_RATE: 2.0 / 8.0,
				HALF_SAMPLE_RATE: 1.0 / 8.0
			},

			uniforms: {
				shadow_pass: { value: null },
				resolution: { value: new Vector2() },
				radius: { value: 4.0 }
			},

			vertexShader: vsm_vert,

			fragmentShader: vsm_frag

		} );

		var shadowMaterialHorizonal = shadowMaterialVertical.clone();
		shadowMaterialHorizonal.defines.HORIZONAL_PASS = 1;

		var fullScreenTri = new BufferGeometry();
		fullScreenTri.setAttribute(
			"position",
			new BufferAttribute(
				new Float32Array( [ - 1, - 1, 0.5, 3, - 1, 0.5, - 1, 3, 0.5 ] ),
				3
			)
		);

		var fullScreenMesh = new Mesh( fullScreenTri, shadowMaterialVertical );

		var scope = this;

		this.enabled = false;

		this.autoUpdate = true;
		this.needsUpdate = false;

		this.type = PCFShadowMap;

		this.render = function ( lights, scene, camera ) {

			if ( scope.enabled === false ) { return; }
			if ( scope.autoUpdate === false && scope.needsUpdate === false ) { return; }

			if ( lights.length === 0 ) { return; }

			var currentRenderTarget = _renderer.getRenderTarget();
			var activeCubeFace = _renderer.getActiveCubeFace();
			var activeMipmapLevel = _renderer.getActiveMipmapLevel();

			var _state = _renderer.state;

			// Set GL state for depth map.
			_state.setBlending( NoBlending );
			_state.buffers.color.setClear( 1, 1, 1, 1 );
			_state.buffers.depth.setTest( true );
			_state.setScissorTest( false );

			// render depth map

			for ( var i = 0, il = lights.length; i < il; i ++ ) {

				var light = lights[ i ];
				var shadow = light.shadow;

				if ( shadow === undefined ) {

					console.warn( 'THREE.WebGLShadowMap:', light, 'has no shadow.' );
					continue;

				}

				_shadowMapSize.copy( shadow.mapSize );

				var shadowFrameExtents = shadow.getFrameExtents();

				_shadowMapSize.multiply( shadowFrameExtents );

				_viewportSize.copy( shadow.mapSize );

				if ( _shadowMapSize.x > maxTextureSize || _shadowMapSize.y > maxTextureSize ) {

					console.warn( 'THREE.WebGLShadowMap:', light, 'has shadow exceeding max texture size, reducing' );

					if ( _shadowMapSize.x > maxTextureSize ) {

						_viewportSize.x = Math.floor( maxTextureSize / shadowFrameExtents.x );
						_shadowMapSize.x = _viewportSize.x * shadowFrameExtents.x;
						shadow.mapSize.x = _viewportSize.x;

					}

					if ( _shadowMapSize.y > maxTextureSize ) {

						_viewportSize.y = Math.floor( maxTextureSize / shadowFrameExtents.y );
						_shadowMapSize.y = _viewportSize.y * shadowFrameExtents.y;
						shadow.mapSize.y = _viewportSize.y;

					}

				}

				if ( shadow.map === null && ! shadow.isPointLightShadow && this.type === VSMShadowMap ) {

					var pars = { minFilter: LinearFilter, magFilter: LinearFilter, format: RGBAFormat };

					shadow.map = new WebGLRenderTarget( _shadowMapSize.x, _shadowMapSize.y, pars );
					shadow.map.texture.name = light.name + ".shadowMap";

					shadow.mapPass = new WebGLRenderTarget( _shadowMapSize.x, _shadowMapSize.y, pars );

					shadow.camera.updateProjectionMatrix();

				}

				if ( shadow.map === null ) {

					var pars = { minFilter: NearestFilter, magFilter: NearestFilter, format: RGBAFormat };

					shadow.map = new WebGLRenderTarget( _shadowMapSize.x, _shadowMapSize.y, pars );
					shadow.map.texture.name = light.name + ".shadowMap";

					shadow.camera.updateProjectionMatrix();

				}

				_renderer.setRenderTarget( shadow.map );
				_renderer.clear();

				var viewportCount = shadow.getViewportCount();

				for ( var vp = 0; vp < viewportCount; vp ++ ) {

					var viewport = shadow.getViewport( vp );

					_viewport.set(
						_viewportSize.x * viewport.x,
						_viewportSize.y * viewport.y,
						_viewportSize.x * viewport.z,
						_viewportSize.y * viewport.w
					);

					_state.viewport( _viewport );

					shadow.updateMatrices( light, vp );

					_frustum = shadow.getFrustum();

					renderObject( scene, camera, shadow.camera, light, this.type );

				}

				// do blur pass for VSM

				if ( ! shadow.isPointLightShadow && this.type === VSMShadowMap ) {

					VSMPass( shadow, camera );

				}

			}

			scope.needsUpdate = false;

			_renderer.setRenderTarget( currentRenderTarget, activeCubeFace, activeMipmapLevel );

		};

		function VSMPass( shadow, camera ) {

			var geometry = _objects.update( fullScreenMesh );

			// vertical pass

			shadowMaterialVertical.uniforms.shadow_pass.value = shadow.map.texture;
			shadowMaterialVertical.uniforms.resolution.value = shadow.mapSize;
			shadowMaterialVertical.uniforms.radius.value = shadow.radius;
			_renderer.setRenderTarget( shadow.mapPass );
			_renderer.clear();
			_renderer.renderBufferDirect( camera, null, geometry, shadowMaterialVertical, fullScreenMesh, null );

			// horizonal pass

			shadowMaterialHorizonal.uniforms.shadow_pass.value = shadow.mapPass.texture;
			shadowMaterialHorizonal.uniforms.resolution.value = shadow.mapSize;
			shadowMaterialHorizonal.uniforms.radius.value = shadow.radius;
			_renderer.setRenderTarget( shadow.map );
			_renderer.clear();
			_renderer.renderBufferDirect( camera, null, geometry, shadowMaterialHorizonal, fullScreenMesh, null );

		}

		function getDepthMaterialVariant( useMorphing, useSkinning, useInstancing ) {

			var index = useMorphing << 0 | useSkinning << 1 | useInstancing << 2;

			var material = _depthMaterials[ index ];

			if ( material === undefined ) {

				material = new MeshDepthMaterial( {

					depthPacking: RGBADepthPacking,

					morphTargets: useMorphing,
					skinning: useSkinning

				} );

				_depthMaterials[ index ] = material;

			}

			return material;

		}

		function getDistanceMaterialVariant( useMorphing, useSkinning, useInstancing ) {

			var index = useMorphing << 0 | useSkinning << 1 | useInstancing << 2;

			var material = _distanceMaterials[ index ];

			if ( material === undefined ) {

				material = new MeshDistanceMaterial( {

					morphTargets: useMorphing,
					skinning: useSkinning

				} );

				_distanceMaterials[ index ] = material;

			}

			return material;

		}

		function getDepthMaterial( object, material, light, shadowCameraNear, shadowCameraFar, type ) {

			var geometry = object.geometry;

			var result = null;

			var getMaterialVariant = getDepthMaterialVariant;
			var customMaterial = object.customDepthMaterial;

			if ( light.isPointLight === true ) {

				getMaterialVariant = getDistanceMaterialVariant;
				customMaterial = object.customDistanceMaterial;

			}

			if ( customMaterial === undefined ) {

				var useMorphing = false;

				if ( material.morphTargets === true ) {

					if ( geometry.isBufferGeometry === true ) {

						useMorphing = geometry.morphAttributes && geometry.morphAttributes.position && geometry.morphAttributes.position.length > 0;

					} else if ( geometry.isGeometry === true ) {

						useMorphing = geometry.morphTargets && geometry.morphTargets.length > 0;

					}

				}

				var useSkinning = false;

				if ( object.isSkinnedMesh === true ) {

					if ( material.skinning === true ) {

						useSkinning = true;

					} else {

						console.warn( 'THREE.WebGLShadowMap: THREE.SkinnedMesh with material.skinning set to false:', object );

					}

				}

				var useInstancing = object.isInstancedMesh === true;

				result = getMaterialVariant( useMorphing, useSkinning, useInstancing );

			} else {

				result = customMaterial;

			}

			if ( _renderer.localClippingEnabled &&
					material.clipShadows === true &&
					material.clippingPlanes.length !== 0 ) {

				// in this case we need a unique material instance reflecting the
				// appropriate state

				var keyA = result.uuid, keyB = material.uuid;

				var materialsForVariant = _materialCache[ keyA ];

				if ( materialsForVariant === undefined ) {

					materialsForVariant = {};
					_materialCache[ keyA ] = materialsForVariant;

				}

				var cachedMaterial = materialsForVariant[ keyB ];

				if ( cachedMaterial === undefined ) {

					cachedMaterial = result.clone();
					materialsForVariant[ keyB ] = cachedMaterial;

				}

				result = cachedMaterial;

			}

			result.visible = material.visible;
			result.wireframe = material.wireframe;

			if ( type === VSMShadowMap ) {

				result.side = ( material.shadowSide !== null ) ? material.shadowSide : material.side;

			} else {

				result.side = ( material.shadowSide !== null ) ? material.shadowSide : shadowSide[ material.side ];

			}

			result.clipShadows = material.clipShadows;
			result.clippingPlanes = material.clippingPlanes;
			result.clipIntersection = material.clipIntersection;

			result.wireframeLinewidth = material.wireframeLinewidth;
			result.linewidth = material.linewidth;

			if ( light.isPointLight === true && result.isMeshDistanceMaterial === true ) {

				result.referencePosition.setFromMatrixPosition( light.matrixWorld );
				result.nearDistance = shadowCameraNear;
				result.farDistance = shadowCameraFar;

			}

			return result;

		}

		function renderObject( object, camera, shadowCamera, light, type ) {

			if ( object.visible === false ) { return; }

			var visible = object.layers.test( camera.layers );

			if ( visible && ( object.isMesh || object.isLine || object.isPoints ) ) {

				if ( ( object.castShadow || ( object.receiveShadow && type === VSMShadowMap ) ) && ( ! object.frustumCulled || _frustum.intersectsObject( object ) ) ) {

					object.modelViewMatrix.multiplyMatrices( shadowCamera.matrixWorldInverse, object.matrixWorld );

					var geometry = _objects.update( object );
					var material = object.material;

					if ( Array.isArray( material ) ) {

						var groups = geometry.groups;

						for ( var k = 0, kl = groups.length; k < kl; k ++ ) {

							var group = groups[ k ];
							var groupMaterial = material[ group.materialIndex ];

							if ( groupMaterial && groupMaterial.visible ) {

								var depthMaterial = getDepthMaterial( object, groupMaterial, light, shadowCamera.near, shadowCamera.far, type );

								_renderer.renderBufferDirect( shadowCamera, null, geometry, depthMaterial, object, group );

							}

						}

					} else if ( material.visible ) {

						var depthMaterial = getDepthMaterial( object, material, light, shadowCamera.near, shadowCamera.far, type );

						_renderer.renderBufferDirect( shadowCamera, null, geometry, depthMaterial, object, null );

					}

				}

			}

			var children = object.children;

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

				renderObject( children[ i ], camera, shadowCamera, light, type );

			}

		}

	}

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function WebGLState( gl, extensions, capabilities ) {

		var isWebGL2 = capabilities.isWebGL2;

		function ColorBuffer() {

			var locked = false;

			var color = new Vector4();
			var currentColorMask = null;
			var currentColorClear = new Vector4( 0, 0, 0, 0 );

			return {

				setMask: function ( colorMask ) {

					if ( currentColorMask !== colorMask && ! locked ) {

						gl.colorMask( colorMask, colorMask, colorMask, colorMask );
						currentColorMask = colorMask;

					}

				},

				setLocked: function ( lock ) {

					locked = lock;

				},

				setClear: function ( r, g, b, a, premultipliedAlpha ) {

					if ( premultipliedAlpha === true ) {

						r *= a; g *= a; b *= a;

					}

					color.set( r, g, b, a );

					if ( currentColorClear.equals( color ) === false ) {

						gl.clearColor( r, g, b, a );
						currentColorClear.copy( color );

					}

				},

				reset: function () {

					locked = false;

					currentColorMask = null;
					currentColorClear.set( - 1, 0, 0, 0 ); // set to invalid state

				}

			};

		}

		function DepthBuffer() {

			var locked = false;

			var currentDepthMask = null;
			var currentDepthFunc = null;
			var currentDepthClear = null;

			return {

				setTest: function ( depthTest ) {

					if ( depthTest ) {

						enable( 2929 );

					} else {

						disable( 2929 );

					}

				},

				setMask: function ( depthMask ) {

					if ( currentDepthMask !== depthMask && ! locked ) {

						gl.depthMask( depthMask );
						currentDepthMask = depthMask;

					}

				},

				setFunc: function ( depthFunc ) {

					if ( currentDepthFunc !== depthFunc ) {

						if ( depthFunc ) {

							switch ( depthFunc ) {

								case NeverDepth:

									gl.depthFunc( 512 );
									break;

								case AlwaysDepth:

									gl.depthFunc( 519 );
									break;

								case LessDepth:

									gl.depthFunc( 513 );
									break;

								case LessEqualDepth:

									gl.depthFunc( 515 );
									break;

								case EqualDepth:

									gl.depthFunc( 514 );
									break;

								case GreaterEqualDepth:

									gl.depthFunc( 518 );
									break;

								case GreaterDepth:

									gl.depthFunc( 516 );
									break;

								case NotEqualDepth:

									gl.depthFunc( 517 );
									break;

								default:

									gl.depthFunc( 515 );

							}

						} else {

							gl.depthFunc( 515 );

						}

						currentDepthFunc = depthFunc;

					}

				},

				setLocked: function ( lock ) {

					locked = lock;

				},

				setClear: function ( depth ) {

					if ( currentDepthClear !== depth ) {

						gl.clearDepth( depth );
						currentDepthClear = depth;

					}

				},

				reset: function () {

					locked = false;

					currentDepthMask = null;
					currentDepthFunc = null;
					currentDepthClear = null;

				}

			};

		}

		function StencilBuffer() {

			var locked = false;

			var currentStencilMask = null;
			var currentStencilFunc = null;
			var currentStencilRef = null;
			var currentStencilFuncMask = null;
			var currentStencilFail = null;
			var currentStencilZFail = null;
			var currentStencilZPass = null;
			var currentStencilClear = null;

			return {

				setTest: function ( stencilTest ) {

					if ( ! locked ) {

						if ( stencilTest ) {

							enable( 2960 );

						} else {

							disable( 2960 );

						}

					}

				},

				setMask: function ( stencilMask ) {

					if ( currentStencilMask !== stencilMask && ! locked ) {

						gl.stencilMask( stencilMask );
						currentStencilMask = stencilMask;

					}

				},

				setFunc: function ( stencilFunc, stencilRef, stencilMask ) {

					if ( currentStencilFunc !== stencilFunc ||
					     currentStencilRef 	!== stencilRef 	||
					     currentStencilFuncMask !== stencilMask ) {

						gl.stencilFunc( stencilFunc, stencilRef, stencilMask );

						currentStencilFunc = stencilFunc;
						currentStencilRef = stencilRef;
						currentStencilFuncMask = stencilMask;

					}

				},

				setOp: function ( stencilFail, stencilZFail, stencilZPass ) {

					if ( currentStencilFail	 !== stencilFail 	||
					     currentStencilZFail !== stencilZFail ||
					     currentStencilZPass !== stencilZPass ) {

						gl.stencilOp( stencilFail, stencilZFail, stencilZPass );

						currentStencilFail = stencilFail;
						currentStencilZFail = stencilZFail;
						currentStencilZPass = stencilZPass;

					}

				},

				setLocked: function ( lock ) {

					locked = lock;

				},

				setClear: function ( stencil ) {

					if ( currentStencilClear !== stencil ) {

						gl.clearStencil( stencil );
						currentStencilClear = stencil;

					}

				},

				reset: function () {

					locked = false;

					currentStencilMask = null;
					currentStencilFunc = null;
					currentStencilRef = null;
					currentStencilFuncMask = null;
					currentStencilFail = null;
					currentStencilZFail = null;
					currentStencilZPass = null;
					currentStencilClear = null;

				}

			};

		}

		//

		var colorBuffer = new ColorBuffer();
		var depthBuffer = new DepthBuffer();
		var stencilBuffer = new StencilBuffer();

		var maxVertexAttributes = gl.getParameter( 34921 );
		var newAttributes = new Uint8Array( maxVertexAttributes );
		var enabledAttributes = new Uint8Array( maxVertexAttributes );
		var attributeDivisors = new Uint8Array( maxVertexAttributes );

		var enabledCapabilities = {};

		var currentProgram = null;

		var currentBlendingEnabled = null;
		var currentBlending = null;
		var currentBlendEquation = null;
		var currentBlendSrc = null;
		var currentBlendDst = null;
		var currentBlendEquationAlpha = null;
		var currentBlendSrcAlpha = null;
		var currentBlendDstAlpha = null;
		var currentPremultipledAlpha = false;

		var currentFlipSided = null;
		var currentCullFace = null;

		var currentLineWidth = null;

		var currentPolygonOffsetFactor = null;
		var currentPolygonOffsetUnits = null;

		var maxTextures = gl.getParameter( 35661 );

		var lineWidthAvailable = false;
		var version = 0;
		var glVersion = gl.getParameter( 7938 );

		if ( glVersion.indexOf( 'WebGL' ) !== - 1 ) {

			version = parseFloat( /^WebGL\ ([0-9])/.exec( glVersion )[ 1 ] );
			lineWidthAvailable = ( version >= 1.0 );

		} else if ( glVersion.indexOf( 'OpenGL ES' ) !== - 1 ) {

			version = parseFloat( /^OpenGL\ ES\ ([0-9])/.exec( glVersion )[ 1 ] );
			lineWidthAvailable = ( version >= 2.0 );

		}

		var currentTextureSlot = null;
		var currentBoundTextures = {};

		var currentScissor = new Vector4();
		var currentViewport = new Vector4();

		function createTexture( type, target, count ) {

			var data = new Uint8Array( 4 ); // 4 is required to match default unpack alignment of 4.
			var texture = gl.createTexture();

			gl.bindTexture( type, texture );
			gl.texParameteri( type, 10241, 9728 );
			gl.texParameteri( type, 10240, 9728 );

			for ( var i = 0; i < count; i ++ ) {

				gl.texImage2D( target + i, 0, 6408, 1, 1, 0, 6408, 5121, data );

			}

			return texture;

		}

		var emptyTextures = {};
		emptyTextures[ 3553 ] = createTexture( 3553, 3553, 1 );
		emptyTextures[ 34067 ] = createTexture( 34067, 34069, 6 );

		// init

		colorBuffer.setClear( 0, 0, 0, 1 );
		depthBuffer.setClear( 1 );
		stencilBuffer.setClear( 0 );

		enable( 2929 );
		depthBuffer.setFunc( LessEqualDepth );

		setFlipSided( false );
		setCullFace( CullFaceBack );
		enable( 2884 );

		setBlending( NoBlending );

		//

		function initAttributes() {

			for ( var i = 0, l = newAttributes.length; i < l; i ++ ) {

				newAttributes[ i ] = 0;

			}

		}

		function enableAttribute( attribute ) {

			enableAttributeAndDivisor( attribute, 0 );

		}

		function enableAttributeAndDivisor( attribute, meshPerAttribute ) {

			newAttributes[ attribute ] = 1;

			if ( enabledAttributes[ attribute ] === 0 ) {

				gl.enableVertexAttribArray( attribute );
				enabledAttributes[ attribute ] = 1;

			}

			if ( attributeDivisors[ attribute ] !== meshPerAttribute ) {

				var extension = isWebGL2 ? gl : extensions.get( 'ANGLE_instanced_arrays' );

				extension[ isWebGL2 ? 'vertexAttribDivisor' : 'vertexAttribDivisorANGLE' ]( attribute, meshPerAttribute );
				attributeDivisors[ attribute ] = meshPerAttribute;

			}

		}

		function disableUnusedAttributes() {

			for ( var i = 0, l = enabledAttributes.length; i !== l; ++ i ) {

				if ( enabledAttributes[ i ] !== newAttributes[ i ] ) {

					gl.disableVertexAttribArray( i );
					enabledAttributes[ i ] = 0;

				}

			}

		}

		function enable( id ) {

			if ( enabledCapabilities[ id ] !== true ) {

				gl.enable( id );
				enabledCapabilities[ id ] = true;

			}

		}

		function disable( id ) {

			if ( enabledCapabilities[ id ] !== false ) {

				gl.disable( id );
				enabledCapabilities[ id ] = false;

			}

		}

		function useProgram( program ) {

			if ( currentProgram !== program ) {

				gl.useProgram( program );

				currentProgram = program;

				return true;

			}

			return false;

		}

		var equationToGL = {};
		equationToGL[ AddEquation ] = 32774;
		equationToGL[ SubtractEquation ] = 32778;
		equationToGL[ ReverseSubtractEquation ] = 32779;

		if ( isWebGL2 ) {

			equationToGL[ MinEquation ] = 32775;
			equationToGL[ MaxEquation ] = 32776;

		} else {

			var extension = extensions.get( 'EXT_blend_minmax' );

			if ( extension !== null ) {

				equationToGL[ MinEquation ] = extension.MIN_EXT;
				equationToGL[ MaxEquation ] = extension.MAX_EXT;

			}

		}

		var factorToGL = {};
		factorToGL[ ZeroFactor ] = 0;
		factorToGL[ OneFactor ] = 1;
		factorToGL[ SrcColorFactor ] = 768;
		factorToGL[ SrcAlphaFactor ] = 770;
		factorToGL[ SrcAlphaSaturateFactor ] = 776;
		factorToGL[ DstColorFactor ] = 774;
		factorToGL[ DstAlphaFactor ] = 772;
		factorToGL[ OneMinusSrcColorFactor ] = 769;
		factorToGL[ OneMinusSrcAlphaFactor ] = 771;
		factorToGL[ OneMinusDstColorFactor ] = 775;
		factorToGL[ OneMinusDstAlphaFactor ] = 773;

		function setBlending( blending, blendEquation, blendSrc, blendDst, blendEquationAlpha, blendSrcAlpha, blendDstAlpha, premultipliedAlpha ) {

			if ( blending === NoBlending ) {

				if ( currentBlendingEnabled ) {

					disable( 3042 );
					currentBlendingEnabled = false;

				}

				return;

			}

			if ( ! currentBlendingEnabled ) {

				enable( 3042 );
				currentBlendingEnabled = true;

			}

			if ( blending !== CustomBlending ) {

				if ( blending !== currentBlending || premultipliedAlpha !== currentPremultipledAlpha ) {

					if ( currentBlendEquation !== AddEquation || currentBlendEquationAlpha !== AddEquation ) {

						gl.blendEquation( 32774 );

						currentBlendEquation = AddEquation;
						currentBlendEquationAlpha = AddEquation;

					}

					if ( premultipliedAlpha ) {

						switch ( blending ) {

							case NormalBlending:
								gl.blendFuncSeparate( 1, 771, 1, 771 );
								break;

							case AdditiveBlending:
								gl.blendFunc( 1, 1 );
								break;

							case SubtractiveBlending:
								gl.blendFuncSeparate( 0, 0, 769, 771 );
								break;

							case MultiplyBlending:
								gl.blendFuncSeparate( 0, 768, 0, 770 );
								break;

							default:
								console.error( 'THREE.WebGLState: Invalid blending: ', blending );
								break;

						}

					} else {

						switch ( blending ) {

							case NormalBlending:
								gl.blendFuncSeparate( 770, 771, 1, 771 );
								break;

							case AdditiveBlending:
								gl.blendFunc( 770, 1 );
								break;

							case SubtractiveBlending:
								gl.blendFunc( 0, 769 );
								break;

							case MultiplyBlending:
								gl.blendFunc( 0, 768 );
								break;

							default:
								console.error( 'THREE.WebGLState: Invalid blending: ', blending );
								break;

						}

					}

					currentBlendSrc = null;
					currentBlendDst = null;
					currentBlendSrcAlpha = null;
					currentBlendDstAlpha = null;

					currentBlending = blending;
					currentPremultipledAlpha = premultipliedAlpha;

				}

				return;

			}

			// custom blending

			blendEquationAlpha = blendEquationAlpha || blendEquation;
			blendSrcAlpha = blendSrcAlpha || blendSrc;
			blendDstAlpha = blendDstAlpha || blendDst;

			if ( blendEquation !== currentBlendEquation || blendEquationAlpha !== currentBlendEquationAlpha ) {

				gl.blendEquationSeparate( equationToGL[ blendEquation ], equationToGL[ blendEquationAlpha ] );

				currentBlendEquation = blendEquation;
				currentBlendEquationAlpha = blendEquationAlpha;

			}

			if ( blendSrc !== currentBlendSrc || blendDst !== currentBlendDst || blendSrcAlpha !== currentBlendSrcAlpha || blendDstAlpha !== currentBlendDstAlpha ) {

				gl.blendFuncSeparate( factorToGL[ blendSrc ], factorToGL[ blendDst ], factorToGL[ blendSrcAlpha ], factorToGL[ blendDstAlpha ] );

				currentBlendSrc = blendSrc;
				currentBlendDst = blendDst;
				currentBlendSrcAlpha = blendSrcAlpha;
				currentBlendDstAlpha = blendDstAlpha;

			}

			currentBlending = blending;
			currentPremultipledAlpha = null;

		}

		function setMaterial( material, frontFaceCW ) {

			material.side === DoubleSide
				? disable( 2884 )
				: enable( 2884 );

			var flipSided = ( material.side === BackSide );
			if ( frontFaceCW ) { flipSided = ! flipSided; }

			setFlipSided( flipSided );

			( material.blending === NormalBlending && material.transparent === false )
				? setBlending( NoBlending )
				: setBlending( material.blending, material.blendEquation, material.blendSrc, material.blendDst, material.blendEquationAlpha, material.blendSrcAlpha, material.blendDstAlpha, material.premultipliedAlpha );

			depthBuffer.setFunc( material.depthFunc );
			depthBuffer.setTest( material.depthTest );
			depthBuffer.setMask( material.depthWrite );
			colorBuffer.setMask( material.colorWrite );

			var stencilWrite = material.stencilWrite;
			stencilBuffer.setTest( stencilWrite );
			if ( stencilWrite ) {

				stencilBuffer.setMask( material.stencilWriteMask );
				stencilBuffer.setFunc( material.stencilFunc, material.stencilRef, material.stencilFuncMask );
				stencilBuffer.setOp( material.stencilFail, material.stencilZFail, material.stencilZPass );

			}

			setPolygonOffset( material.polygonOffset, material.polygonOffsetFactor, material.polygonOffsetUnits );

		}

		//

		function setFlipSided( flipSided ) {

			if ( currentFlipSided !== flipSided ) {

				if ( flipSided ) {

					gl.frontFace( 2304 );

				} else {

					gl.frontFace( 2305 );

				}

				currentFlipSided = flipSided;

			}

		}

		function setCullFace( cullFace ) {

			if ( cullFace !== CullFaceNone ) {

				enable( 2884 );

				if ( cullFace !== currentCullFace ) {

					if ( cullFace === CullFaceBack ) {

						gl.cullFace( 1029 );

					} else if ( cullFace === CullFaceFront ) {

						gl.cullFace( 1028 );

					} else {

						gl.cullFace( 1032 );

					}

				}

			} else {

				disable( 2884 );

			}

			currentCullFace = cullFace;

		}

		function setLineWidth( width ) {

			if ( width !== currentLineWidth ) {

				if ( lineWidthAvailable ) { gl.lineWidth( width ); }

				currentLineWidth = width;

			}

		}

		function setPolygonOffset( polygonOffset, factor, units ) {

			if ( polygonOffset ) {

				enable( 32823 );

				if ( currentPolygonOffsetFactor !== factor || currentPolygonOffsetUnits !== units ) {

					gl.polygonOffset( factor, units );

					currentPolygonOffsetFactor = factor;
					currentPolygonOffsetUnits = units;

				}

			} else {

				disable( 32823 );

			}

		}

		function setScissorTest( scissorTest ) {

			if ( scissorTest ) {

				enable( 3089 );

			} else {

				disable( 3089 );

			}

		}

		// texture

		function activeTexture( webglSlot ) {

			if ( webglSlot === undefined ) { webglSlot = 33984 + maxTextures - 1; }

			if ( currentTextureSlot !== webglSlot ) {

				gl.activeTexture( webglSlot );
				currentTextureSlot = webglSlot;

			}

		}

		function bindTexture( webglType, webglTexture ) {

			if ( currentTextureSlot === null ) {

				activeTexture();

			}

			var boundTexture = currentBoundTextures[ currentTextureSlot ];

			if ( boundTexture === undefined ) {

				boundTexture = { type: undefined, texture: undefined };
				currentBoundTextures[ currentTextureSlot ] = boundTexture;

			}

			if ( boundTexture.type !== webglType || boundTexture.texture !== webglTexture ) {

				gl.bindTexture( webglType, webglTexture || emptyTextures[ webglType ] );

				boundTexture.type = webglType;
				boundTexture.texture = webglTexture;

			}

		}

		function unbindTexture() {

			var boundTexture = currentBoundTextures[ currentTextureSlot ];

			if ( boundTexture !== undefined && boundTexture.type !== undefined ) {

				gl.bindTexture( boundTexture.type, null );

				boundTexture.type = undefined;
				boundTexture.texture = undefined;

			}

		}

		function compressedTexImage2D() {

			try {

				gl.compressedTexImage2D.apply( gl, arguments );

			} catch ( error ) {

				console.error( 'THREE.WebGLState:', error );

			}

		}

		function texImage2D() {

			try {

				gl.texImage2D.apply( gl, arguments );

			} catch ( error ) {

				console.error( 'THREE.WebGLState:', error );

			}

		}

		function texImage3D() {

			try {

				gl.texImage3D.apply( gl, arguments );

			} catch ( error ) {

				console.error( 'THREE.WebGLState:', error );

			}

		}

		//

		function scissor( scissor ) {

			if ( currentScissor.equals( scissor ) === false ) {

				gl.scissor( scissor.x, scissor.y, scissor.z, scissor.w );
				currentScissor.copy( scissor );

			}

		}

		function viewport( viewport ) {

			if ( currentViewport.equals( viewport ) === false ) {

				gl.viewport( viewport.x, viewport.y, viewport.z, viewport.w );
				currentViewport.copy( viewport );

			}

		}

		//

		function reset() {

			for ( var i = 0; i < enabledAttributes.length; i ++ ) {

				if ( enabledAttributes[ i ] === 1 ) {

					gl.disableVertexAttribArray( i );
					enabledAttributes[ i ] = 0;

				}

			}

			enabledCapabilities = {};

			currentTextureSlot = null;
			currentBoundTextures = {};

			currentProgram = null;

			currentBlending = null;

			currentFlipSided = null;
			currentCullFace = null;

			colorBuffer.reset();
			depthBuffer.reset();
			stencilBuffer.reset();

		}

		return {

			buffers: {
				color: colorBuffer,
				depth: depthBuffer,
				stencil: stencilBuffer
			},

			initAttributes: initAttributes,
			enableAttribute: enableAttribute,
			enableAttributeAndDivisor: enableAttributeAndDivisor,
			disableUnusedAttributes: disableUnusedAttributes,
			enable: enable,
			disable: disable,

			useProgram: useProgram,

			setBlending: setBlending,
			setMaterial: setMaterial,

			setFlipSided: setFlipSided,
			setCullFace: setCullFace,

			setLineWidth: setLineWidth,
			setPolygonOffset: setPolygonOffset,

			setScissorTest: setScissorTest,

			activeTexture: activeTexture,
			bindTexture: bindTexture,
			unbindTexture: unbindTexture,
			compressedTexImage2D: compressedTexImage2D,
			texImage2D: texImage2D,
			texImage3D: texImage3D,

			scissor: scissor,
			viewport: viewport,

			reset: reset

		};

	}

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function WebGLTextures( _gl, extensions, state, properties, capabilities, utils, info ) {

		var isWebGL2 = capabilities.isWebGL2;
		var maxTextures = capabilities.maxTextures;
		var maxCubemapSize = capabilities.maxCubemapSize;
		var maxTextureSize = capabilities.maxTextureSize;
		var maxSamples = capabilities.maxSamples;

		var _videoTextures = new WeakMap();
		var _canvas;

		// cordova iOS (as of 5.0) still uses UIWebView, which provides OffscreenCanvas,
		// also OffscreenCanvas.getContext("webgl"), but not OffscreenCanvas.getContext("2d")!
		// Some implementations may only implement OffscreenCanvas partially (e.g. lacking 2d).

		var useOffscreenCanvas = false;

		try {

			useOffscreenCanvas = typeof OffscreenCanvas !== 'undefined'
				&& ( new OffscreenCanvas( 1, 1 ).getContext( "2d" ) ) !== null;

		} catch ( err ) {

			// Ignore any errors

		}

		function createCanvas( width, height ) {

			// Use OffscreenCanvas when available. Specially needed in web workers

			return useOffscreenCanvas ?
				new OffscreenCanvas( width, height ) :
				document.createElementNS( 'http://www.w3.org/1999/xhtml', 'canvas' );

		}

		function resizeImage( image, needsPowerOfTwo, needsNewCanvas, maxSize ) {

			var scale = 1;

			// handle case if texture exceeds max size

			if ( image.width > maxSize || image.height > maxSize ) {

				scale = maxSize / Math.max( image.width, image.height );

			}

			// only perform resize if necessary

			if ( scale < 1 || needsPowerOfTwo === true ) {

				// only perform resize for certain image types

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

					var floor = needsPowerOfTwo ? MathUtils.floorPowerOfTwo : Math.floor;

					var width = floor( scale * image.width );
					var height = floor( scale * image.height );

					if ( _canvas === undefined ) { _canvas = createCanvas( width, height ); }

					// cube textures can't reuse the same canvas

					var canvas = needsNewCanvas ? createCanvas( width, height ) : _canvas;

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

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

					console.warn( 'THREE.WebGLRenderer: Texture has been resized from (' + image.width + 'x' + image.height + ') to (' + width + 'x' + height + ').' );

					return canvas;

				} else {

					if ( 'data' in image ) {

						console.warn( 'THREE.WebGLRenderer: Image in DataTexture is too big (' + image.width + 'x' + image.height + ').' );

					}

					return image;

				}

			}

			return image;

		}

		function isPowerOfTwo( image ) {

			return MathUtils.isPowerOfTwo( image.width ) && MathUtils.isPowerOfTwo( image.height );

		}

		function textureNeedsPowerOfTwo( texture ) {

			if ( isWebGL2 ) { return false; }

			return ( texture.wrapS !== ClampToEdgeWrapping || texture.wrapT !== ClampToEdgeWrapping ) ||
				( texture.minFilter !== NearestFilter && texture.minFilter !== LinearFilter );

		}

		function textureNeedsGenerateMipmaps( texture, supportsMips ) {

			return texture.generateMipmaps && supportsMips &&
				texture.minFilter !== NearestFilter && texture.minFilter !== LinearFilter;

		}

		function generateMipmap( target, texture, width, height ) {

			_gl.generateMipmap( target );

			var textureProperties = properties.get( texture );

			// Note: Math.log( x ) * Math.LOG2E used instead of Math.log2( x ) which is not supported by IE11
			textureProperties.__maxMipLevel = Math.log( Math.max( width, height ) ) * Math.LOG2E;

		}

		function getInternalFormat( internalFormatName, glFormat, glType ) {

			if ( isWebGL2 === false ) { return glFormat; }

			if ( internalFormatName !== null ) {

				if ( _gl[ internalFormatName ] !== undefined ) { return _gl[ internalFormatName ]; }

				console.warn( 'THREE.WebGLRenderer: Attempt to use non-existing WebGL internal format \'' + internalFormatName + '\'' );

			}

			var internalFormat = glFormat;

			if ( glFormat === 6403 ) {

				if ( glType === 5126 ) { internalFormat = 33326; }
				if ( glType === 5131 ) { internalFormat = 33325; }
				if ( glType === 5121 ) { internalFormat = 33321; }

			}

			if ( glFormat === 6407 ) {

				if ( glType === 5126 ) { internalFormat = 34837; }
				if ( glType === 5131 ) { internalFormat = 34843; }
				if ( glType === 5121 ) { internalFormat = 32849; }

			}

			if ( glFormat === 6408 ) {

				if ( glType === 5126 ) { internalFormat = 34836; }
				if ( glType === 5131 ) { internalFormat = 34842; }
				if ( glType === 5121 ) { internalFormat = 32856; }

			}

			if ( internalFormat === 33325 || internalFormat === 33326 ||
				internalFormat === 34842 || internalFormat === 34836 ) {

				extensions.get( 'EXT_color_buffer_float' );

			} else if ( internalFormat === 34843 || internalFormat === 34837 ) {

				console.warn( 'THREE.WebGLRenderer: Floating point textures with RGB format not supported. Please use RGBA instead.' );

			}

			return internalFormat;

		}

		// Fallback filters for non-power-of-2 textures

		function filterFallback( f ) {

			if ( f === NearestFilter || f === NearestMipmapNearestFilter || f === NearestMipmapLinearFilter ) {

				return 9728;

			}

			return 9729;

		}

		//

		function onTextureDispose( event ) {

			var texture = event.target;

			texture.removeEventListener( 'dispose', onTextureDispose );

			deallocateTexture( texture );

			if ( texture.isVideoTexture ) {

				_videoTextures.delete( texture );

			}

			info.memory.textures --;

		}

		function onRenderTargetDispose( event ) {

			var renderTarget = event.target;

			renderTarget.removeEventListener( 'dispose', onRenderTargetDispose );

			deallocateRenderTarget( renderTarget );

			info.memory.textures --;

		}

		//

		function deallocateTexture( texture ) {

			var textureProperties = properties.get( texture );

			if ( textureProperties.__webglInit === undefined ) { return; }

			_gl.deleteTexture( textureProperties.__webglTexture );

			properties.remove( texture );

		}

		function deallocateRenderTarget( renderTarget ) {

			var renderTargetProperties = properties.get( renderTarget );
			var textureProperties = properties.get( renderTarget.texture );

			if ( ! renderTarget ) { return; }

			if ( textureProperties.__webglTexture !== undefined ) {

				_gl.deleteTexture( textureProperties.__webglTexture );

			}

			if ( renderTarget.depthTexture ) {

				renderTarget.depthTexture.dispose();

			}

			if ( renderTarget.isWebGLCubeRenderTarget ) {

				for ( var i = 0; i < 6; i ++ ) {

					_gl.deleteFramebuffer( renderTargetProperties.__webglFramebuffer[ i ] );
					if ( renderTargetProperties.__webglDepthbuffer ) { _gl.deleteRenderbuffer( renderTargetProperties.__webglDepthbuffer[ i ] ); }

				}

			} else {

				_gl.deleteFramebuffer( renderTargetProperties.__webglFramebuffer );
				if ( renderTargetProperties.__webglDepthbuffer ) { _gl.deleteRenderbuffer( renderTargetProperties.__webglDepthbuffer ); }

			}

			if ( renderTarget.isWebGLMultiviewRenderTarget ) {

				_gl.deleteTexture( renderTargetProperties.__webglColorTexture );
				_gl.deleteTexture( renderTargetProperties.__webglDepthStencilTexture );

				info.memory.textures -= 2;

				for ( var i = 0, il = renderTargetProperties.__webglViewFramebuffers.length; i < il; i ++ ) {

					_gl.deleteFramebuffer( renderTargetProperties.__webglViewFramebuffers[ i ] );

				}

			}

			properties.remove( renderTarget.texture );
			properties.remove( renderTarget );

		}

		//

		var textureUnits = 0;

		function resetTextureUnits() {

			textureUnits = 0;

		}

		function allocateTextureUnit() {

			var textureUnit = textureUnits;

			if ( textureUnit >= maxTextures ) {

				console.warn( 'THREE.WebGLTextures: Trying to use ' + textureUnit + ' texture units while this GPU supports only ' + maxTextures );

			}

			textureUnits += 1;

			return textureUnit;

		}

		//

		function setTexture2D( texture, slot ) {

			var textureProperties = properties.get( texture );

			if ( texture.isVideoTexture ) { updateVideoTexture( texture ); }

			if ( texture.version > 0 && textureProperties.__version !== texture.version ) {

				var image = texture.image;

				if ( image === undefined ) {

					console.warn( 'THREE.WebGLRenderer: Texture marked for update but image is undefined' );

				} else if ( image.complete === false ) {

					console.warn( 'THREE.WebGLRenderer: Texture marked for update but image is incomplete' );

				} else {

					uploadTexture( textureProperties, texture, slot );
					return;

				}

			}

			state.activeTexture( 33984 + slot );
			state.bindTexture( 3553, textureProperties.__webglTexture );

		}

		function setTexture2DArray( texture, slot ) {

			var textureProperties = properties.get( texture );

			if ( texture.version > 0 && textureProperties.__version !== texture.version ) {

				uploadTexture( textureProperties, texture, slot );
				return;

			}

			state.activeTexture( 33984 + slot );
			state.bindTexture( 35866, textureProperties.__webglTexture );

		}

		function setTexture3D( texture, slot ) {

			var textureProperties = properties.get( texture );

			if ( texture.version > 0 && textureProperties.__version !== texture.version ) {

				uploadTexture( textureProperties, texture, slot );
				return;

			}

			state.activeTexture( 33984 + slot );
			state.bindTexture( 32879, textureProperties.__webglTexture );

		}

		function setTextureCube( texture, slot ) {

			if ( texture.image.length !== 6 ) { return; }

			var textureProperties = properties.get( texture );

			if ( texture.version > 0 && textureProperties.__version !== texture.version ) {

				initTexture( textureProperties, texture );

				state.activeTexture( 33984 + slot );
				state.bindTexture( 34067, textureProperties.__webglTexture );

				_gl.pixelStorei( 37440, texture.flipY );

				var isCompressed = ( texture && ( texture.isCompressedTexture || texture.image[ 0 ].isCompressedTexture ) );
				var isDataTexture = ( texture.image[ 0 ] && texture.image[ 0 ].isDataTexture );

				var cubeImage = [];

				for ( var i = 0; i < 6; i ++ ) {

					if ( ! isCompressed && ! isDataTexture ) {

						cubeImage[ i ] = resizeImage( texture.image[ i ], false, true, maxCubemapSize );

					} else {

						cubeImage[ i ] = isDataTexture ? texture.image[ i ].image : texture.image[ i ];

					}

				}

				var image = cubeImage[ 0 ],
					supportsMips = isPowerOfTwo( image ) || isWebGL2,
					glFormat = utils.convert( texture.format ),
					glType = utils.convert( texture.type ),
					glInternalFormat = getInternalFormat( texture.internalFormat, glFormat, glType );

				setTextureParameters( 34067, texture, supportsMips );

				var mipmaps;

				if ( isCompressed ) {

					for ( var i = 0; i < 6; i ++ ) {

						mipmaps = cubeImage[ i ].mipmaps;

						for ( var j = 0; j < mipmaps.length; j ++ ) {

							var mipmap = mipmaps[ j ];

							if ( texture.format !== RGBAFormat && texture.format !== RGBFormat ) {

								if ( glFormat !== null ) {

									state.compressedTexImage2D( 34069 + i, j, glInternalFormat, mipmap.width, mipmap.height, 0, mipmap.data );

								} else {

									console.warn( 'THREE.WebGLRenderer: Attempt to load unsupported compressed texture format in .setTextureCube()' );

								}

							} else {

								state.texImage2D( 34069 + i, j, glInternalFormat, mipmap.width, mipmap.height, 0, glFormat, glType, mipmap.data );

							}

						}

					}

					textureProperties.__maxMipLevel = mipmaps.length - 1;

				} else {

					mipmaps = texture.mipmaps;

					for ( var i = 0; i < 6; i ++ ) {

						if ( isDataTexture ) {

							state.texImage2D( 34069 + i, 0, glInternalFormat, cubeImage[ i ].width, cubeImage[ i ].height, 0, glFormat, glType, cubeImage[ i ].data );

							for ( var j = 0; j < mipmaps.length; j ++ ) {

								var mipmap = mipmaps[ j ];
								var mipmapImage = mipmap.image[ i ].image;

								state.texImage2D( 34069 + i, j + 1, glInternalFormat, mipmapImage.width, mipmapImage.height, 0, glFormat, glType, mipmapImage.data );

							}

						} else {

							state.texImage2D( 34069 + i, 0, glInternalFormat, glFormat, glType, cubeImage[ i ] );

							for ( var j = 0; j < mipmaps.length; j ++ ) {

								var mipmap = mipmaps[ j ];

								state.texImage2D( 34069 + i, j + 1, glInternalFormat, glFormat, glType, mipmap.image[ i ] );

							}

						}

					}

					textureProperties.__maxMipLevel = mipmaps.length;

				}

				if ( textureNeedsGenerateMipmaps( texture, supportsMips ) ) {

					// We assume images for cube map have the same size.
					generateMipmap( 34067, texture, image.width, image.height );

				}

				textureProperties.__version = texture.version;

				if ( texture.onUpdate ) { texture.onUpdate( texture ); }

			} else {

				state.activeTexture( 33984 + slot );
				state.bindTexture( 34067, textureProperties.__webglTexture );

			}

		}

		function setTextureCubeDynamic( texture, slot ) {

			state.activeTexture( 33984 + slot );
			state.bindTexture( 34067, properties.get( texture ).__webglTexture );

		}

		var wrappingToGL = {};
		wrappingToGL[ RepeatWrapping ] = 10497;
		wrappingToGL[ ClampToEdgeWrapping ] = 33071;
		wrappingToGL[ MirroredRepeatWrapping ] = 33648;

		var filterToGL = {};
		filterToGL[ NearestFilter ] = 9728;
		filterToGL[ NearestMipmapNearestFilter ] = 9984;
		filterToGL[ NearestMipmapLinearFilter ] = 9986;
		filterToGL[ LinearFilter ] = 9729;
		filterToGL[ LinearMipmapNearestFilter ] = 9985;
		filterToGL[ LinearMipmapLinearFilter ] = 9987;

		function setTextureParameters( textureType, texture, supportsMips ) {

			if ( supportsMips ) {

				_gl.texParameteri( textureType, 10242, wrappingToGL[ texture.wrapS ] );
				_gl.texParameteri( textureType, 10243, wrappingToGL[ texture.wrapT ] );

				if ( textureType === 32879 || textureType === 35866 ) {

					_gl.texParameteri( textureType, 32882, wrappingToGL[ texture.wrapR ] );

				}

				_gl.texParameteri( textureType, 10240, filterToGL[ texture.magFilter ] );
				_gl.texParameteri( textureType, 10241, filterToGL[ texture.minFilter ] );

			} else {

				_gl.texParameteri( textureType, 10242, 33071 );
				_gl.texParameteri( textureType, 10243, 33071 );

				if ( textureType === 32879 || textureType === 35866 ) {

					_gl.texParameteri( textureType, 32882, 33071 );

				}

				if ( texture.wrapS !== ClampToEdgeWrapping || texture.wrapT !== ClampToEdgeWrapping ) {

					console.warn( 'THREE.WebGLRenderer: Texture is not power of two. Texture.wrapS and Texture.wrapT should be set to THREE.ClampToEdgeWrapping.' );

				}

				_gl.texParameteri( textureType, 10240, filterFallback( texture.magFilter ) );
				_gl.texParameteri( textureType, 10241, filterFallback( texture.minFilter ) );

				if ( texture.minFilter !== NearestFilter && texture.minFilter !== LinearFilter ) {

					console.warn( 'THREE.WebGLRenderer: Texture is not power of two. Texture.minFilter should be set to THREE.NearestFilter or THREE.LinearFilter.' );

				}

			}

			var extension = extensions.get( 'EXT_texture_filter_anisotropic' );

			if ( extension ) {

				if ( texture.type === FloatType && extensions.get( 'OES_texture_float_linear' ) === null ) { return; }
				if ( texture.type === HalfFloatType && ( isWebGL2 || extensions.get( 'OES_texture_half_float_linear' ) ) === null ) { return; }

				if ( texture.anisotropy > 1 || properties.get( texture ).__currentAnisotropy ) {

					_gl.texParameterf( textureType, extension.TEXTURE_MAX_ANISOTROPY_EXT, Math.min( texture.anisotropy, capabilities.getMaxAnisotropy() ) );
					properties.get( texture ).__currentAnisotropy = texture.anisotropy;

				}

			}

		}

		function initTexture( textureProperties, texture ) {

			if ( textureProperties.__webglInit === undefined ) {

				textureProperties.__webglInit = true;

				texture.addEventListener( 'dispose', onTextureDispose );

				textureProperties.__webglTexture = _gl.createTexture();

				info.memory.textures ++;

			}

		}

		function uploadTexture( textureProperties, texture, slot ) {

			var textureType = 3553;

			if ( texture.isDataTexture2DArray ) { textureType = 35866; }
			if ( texture.isDataTexture3D ) { textureType = 32879; }

			initTexture( textureProperties, texture );

			state.activeTexture( 33984 + slot );
			state.bindTexture( textureType, textureProperties.__webglTexture );

			_gl.pixelStorei( 37440, texture.flipY );
			_gl.pixelStorei( 37441, texture.premultiplyAlpha );
			_gl.pixelStorei( 3317, texture.unpackAlignment );

			var needsPowerOfTwo = textureNeedsPowerOfTwo( texture ) && isPowerOfTwo( texture.image ) === false;
			var image = resizeImage( texture.image, needsPowerOfTwo, false, maxTextureSize );

			var supportsMips = isPowerOfTwo( image ) || isWebGL2,
				glFormat = utils.convert( texture.format ),
				glType = utils.convert( texture.type ),
				glInternalFormat = getInternalFormat( texture.internalFormat, glFormat, glType );

			setTextureParameters( textureType, texture, supportsMips );

			var mipmap, mipmaps = texture.mipmaps;

			if ( texture.isDepthTexture ) {

				// populate depth texture with dummy data

				glInternalFormat = 6402;

				if ( texture.type === FloatType ) {

					if ( isWebGL2 === false ) { throw new Error( 'Float Depth Texture only supported in WebGL2.0' ); }
					glInternalFormat = 36012;

				} else if ( isWebGL2 ) {

					// WebGL 2.0 requires signed internalformat for glTexImage2D
					glInternalFormat = 33189;

				}

				if ( texture.format === DepthFormat && glInternalFormat === 6402 ) {

					// The error INVALID_OPERATION is generated by texImage2D if format and internalformat are
					// DEPTH_COMPONENT and type is not UNSIGNED_SHORT or UNSIGNED_INT
					// (https://www.khronos.org/registry/webgl/extensions/WEBGL_depth_texture/)
					if ( texture.type !== UnsignedShortType && texture.type !== UnsignedIntType ) {

						console.warn( 'THREE.WebGLRenderer: Use UnsignedShortType or UnsignedIntType for DepthFormat DepthTexture.' );

						texture.type = UnsignedShortType;
						glType = utils.convert( texture.type );

					}

				}

				// Depth stencil textures need the DEPTH_STENCIL internal format
				// (https://www.khronos.org/registry/webgl/extensions/WEBGL_depth_texture/)
				if ( texture.format === DepthStencilFormat ) {

					glInternalFormat = 34041;

					// The error INVALID_OPERATION is generated by texImage2D if format and internalformat are
					// DEPTH_STENCIL and type is not UNSIGNED_INT_24_8_WEBGL.
					// (https://www.khronos.org/registry/webgl/extensions/WEBGL_depth_texture/)
					if ( texture.type !== UnsignedInt248Type ) {

						console.warn( 'THREE.WebGLRenderer: Use UnsignedInt248Type for DepthStencilFormat DepthTexture.' );

						texture.type = UnsignedInt248Type;
						glType = utils.convert( texture.type );

					}

				}

				state.texImage2D( 3553, 0, glInternalFormat, image.width, image.height, 0, glFormat, glType, null );

			} else if ( texture.isDataTexture ) {

				// use manually created mipmaps if available
				// if there are no manual mipmaps
				// set 0 level mipmap and then use GL to generate other mipmap levels

				if ( mipmaps.length > 0 && supportsMips ) {

					for ( var i = 0, il = mipmaps.length; i < il; i ++ ) {

						mipmap = mipmaps[ i ];
						state.texImage2D( 3553, i, glInternalFormat, mipmap.width, mipmap.height, 0, glFormat, glType, mipmap.data );

					}

					texture.generateMipmaps = false;
					textureProperties.__maxMipLevel = mipmaps.length - 1;

				} else {

					state.texImage2D( 3553, 0, glInternalFormat, image.width, image.height, 0, glFormat, glType, image.data );
					textureProperties.__maxMipLevel = 0;

				}

			} else if ( texture.isCompressedTexture ) {

				for ( var i = 0, il = mipmaps.length; i < il; i ++ ) {

					mipmap = mipmaps[ i ];

					if ( texture.format !== RGBAFormat && texture.format !== RGBFormat ) {

						if ( glFormat !== null ) {

							state.compressedTexImage2D( 3553, i, glInternalFormat, mipmap.width, mipmap.height, 0, mipmap.data );

						} else {

							console.warn( 'THREE.WebGLRenderer: Attempt to load unsupported compressed texture format in .uploadTexture()' );

						}

					} else {

						state.texImage2D( 3553, i, glInternalFormat, mipmap.width, mipmap.height, 0, glFormat, glType, mipmap.data );

					}

				}

				textureProperties.__maxMipLevel = mipmaps.length - 1;

			} else if ( texture.isDataTexture2DArray ) {

				state.texImage3D( 35866, 0, glInternalFormat, image.width, image.height, image.depth, 0, glFormat, glType, image.data );
				textureProperties.__maxMipLevel = 0;

			} else if ( texture.isDataTexture3D ) {

				state.texImage3D( 32879, 0, glInternalFormat, image.width, image.height, image.depth, 0, glFormat, glType, image.data );
				textureProperties.__maxMipLevel = 0;

			} else {

				// regular Texture (image, video, canvas)

				// use manually created mipmaps if available
				// if there are no manual mipmaps
				// set 0 level mipmap and then use GL to generate other mipmap levels

				if ( mipmaps.length > 0 && supportsMips ) {

					for ( var i = 0, il = mipmaps.length; i < il; i ++ ) {

						mipmap = mipmaps[ i ];
						state.texImage2D( 3553, i, glInternalFormat, glFormat, glType, mipmap );

					}

					texture.generateMipmaps = false;
					textureProperties.__maxMipLevel = mipmaps.length - 1;

				} else {

					state.texImage2D( 3553, 0, glInternalFormat, glFormat, glType, image );
					textureProperties.__maxMipLevel = 0;

				}

			}

			if ( textureNeedsGenerateMipmaps( texture, supportsMips ) ) {

				generateMipmap( textureType, texture, image.width, image.height );

			}

			textureProperties.__version = texture.version;

			if ( texture.onUpdate ) { texture.onUpdate( texture ); }

		}

		// Render targets

		// Setup storage for target texture and bind it to correct framebuffer
		function setupFrameBufferTexture( framebuffer, renderTarget, attachment, textureTarget ) {

			var glFormat = utils.convert( renderTarget.texture.format );
			var glType = utils.convert( renderTarget.texture.type );
			var glInternalFormat = getInternalFormat( renderTarget.texture.internalFormat, glFormat, glType );
			state.texImage2D( textureTarget, 0, glInternalFormat, renderTarget.width, renderTarget.height, 0, glFormat, glType, null );
			_gl.bindFramebuffer( 36160, framebuffer );
			_gl.framebufferTexture2D( 36160, attachment, textureTarget, properties.get( renderTarget.texture ).__webglTexture, 0 );
			_gl.bindFramebuffer( 36160, null );

		}

		// Setup storage for internal depth/stencil buffers and bind to correct framebuffer
		function setupRenderBufferStorage( renderbuffer, renderTarget, isMultisample ) {

			_gl.bindRenderbuffer( 36161, renderbuffer );

			if ( renderTarget.depthBuffer && ! renderTarget.stencilBuffer ) {

				if ( isMultisample ) {

					var samples = getRenderTargetSamples( renderTarget );

					_gl.renderbufferStorageMultisample( 36161, samples, 33189, renderTarget.width, renderTarget.height );

				} else {

					_gl.renderbufferStorage( 36161, 33189, renderTarget.width, renderTarget.height );

				}

				_gl.framebufferRenderbuffer( 36160, 36096, 36161, renderbuffer );

			} else if ( renderTarget.depthBuffer && renderTarget.stencilBuffer ) {

				if ( isMultisample ) {

					var samples = getRenderTargetSamples( renderTarget );

					_gl.renderbufferStorageMultisample( 36161, samples, 35056, renderTarget.width, renderTarget.height );

				} else {

					_gl.renderbufferStorage( 36161, 34041, renderTarget.width, renderTarget.height );

				}


				_gl.framebufferRenderbuffer( 36160, 33306, 36161, renderbuffer );

			} else {

				var glFormat = utils.convert( renderTarget.texture.format );
				var glType = utils.convert( renderTarget.texture.type );
				var glInternalFormat = getInternalFormat( renderTarget.texture.internalFormat, glFormat, glType );

				if ( isMultisample ) {

					var samples = getRenderTargetSamples( renderTarget );

					_gl.renderbufferStorageMultisample( 36161, samples, glInternalFormat, renderTarget.width, renderTarget.height );

				} else {

					_gl.renderbufferStorage( 36161, glInternalFormat, renderTarget.width, renderTarget.height );

				}

			}

			_gl.bindRenderbuffer( 36161, null );

		}

		// Setup resources for a Depth Texture for a FBO (needs an extension)
		function setupDepthTexture( framebuffer, renderTarget ) {

			var isCube = ( renderTarget && renderTarget.isWebGLCubeRenderTarget );
			if ( isCube ) { throw new Error( 'Depth Texture with cube render targets is not supported' ); }

			_gl.bindFramebuffer( 36160, framebuffer );

			if ( ! ( renderTarget.depthTexture && renderTarget.depthTexture.isDepthTexture ) ) {

				throw new Error( 'renderTarget.depthTexture must be an instance of THREE.DepthTexture' );

			}

			// upload an empty depth texture with framebuffer size
			if ( ! properties.get( renderTarget.depthTexture ).__webglTexture ||
					renderTarget.depthTexture.image.width !== renderTarget.width ||
					renderTarget.depthTexture.image.height !== renderTarget.height ) {

				renderTarget.depthTexture.image.width = renderTarget.width;
				renderTarget.depthTexture.image.height = renderTarget.height;
				renderTarget.depthTexture.needsUpdate = true;

			}

			setTexture2D( renderTarget.depthTexture, 0 );

			var webglDepthTexture = properties.get( renderTarget.depthTexture ).__webglTexture;

			if ( renderTarget.depthTexture.format === DepthFormat ) {

				_gl.framebufferTexture2D( 36160, 36096, 3553, webglDepthTexture, 0 );

			} else if ( renderTarget.depthTexture.format === DepthStencilFormat ) {

				_gl.framebufferTexture2D( 36160, 33306, 3553, webglDepthTexture, 0 );

			} else {

				throw new Error( 'Unknown depthTexture format' );

			}

		}

		// Setup GL resources for a non-texture depth buffer
		function setupDepthRenderbuffer( renderTarget ) {

			var renderTargetProperties = properties.get( renderTarget );

			var isCube = ( renderTarget.isWebGLCubeRenderTarget === true );

			if ( renderTarget.depthTexture ) {

				if ( isCube ) { throw new Error( 'target.depthTexture not supported in Cube render targets' ); }

				setupDepthTexture( renderTargetProperties.__webglFramebuffer, renderTarget );

			} else {

				if ( isCube ) {

					renderTargetProperties.__webglDepthbuffer = [];

					for ( var i = 0; i < 6; i ++ ) {

						_gl.bindFramebuffer( 36160, renderTargetProperties.__webglFramebuffer[ i ] );
						renderTargetProperties.__webglDepthbuffer[ i ] = _gl.createRenderbuffer();
						setupRenderBufferStorage( renderTargetProperties.__webglDepthbuffer[ i ], renderTarget );

					}

				} else {

					_gl.bindFramebuffer( 36160, renderTargetProperties.__webglFramebuffer );
					renderTargetProperties.__webglDepthbuffer = _gl.createRenderbuffer();
					setupRenderBufferStorage( renderTargetProperties.__webglDepthbuffer, renderTarget );

				}

			}

			_gl.bindFramebuffer( 36160, null );

		}

		// Set up GL resources for the render target
		function setupRenderTarget( renderTarget ) {

			var renderTargetProperties = properties.get( renderTarget );
			var textureProperties = properties.get( renderTarget.texture );

			renderTarget.addEventListener( 'dispose', onRenderTargetDispose );

			textureProperties.__webglTexture = _gl.createTexture();

			info.memory.textures ++;

			var isCube = ( renderTarget.isWebGLCubeRenderTarget === true );
			var isMultisample = ( renderTarget.isWebGLMultisampleRenderTarget === true );
			var isMultiview = ( renderTarget.isWebGLMultiviewRenderTarget === true );
			var supportsMips = isPowerOfTwo( renderTarget ) || isWebGL2;

			// Setup framebuffer

			if ( isCube ) {

				renderTargetProperties.__webglFramebuffer = [];

				for ( var i = 0; i < 6; i ++ ) {

					renderTargetProperties.__webglFramebuffer[ i ] = _gl.createFramebuffer();

				}

			} else {

				renderTargetProperties.__webglFramebuffer = _gl.createFramebuffer();

				if ( isMultisample ) {

					if ( isWebGL2 ) {

						renderTargetProperties.__webglMultisampledFramebuffer = _gl.createFramebuffer();
						renderTargetProperties.__webglColorRenderbuffer = _gl.createRenderbuffer();

						_gl.bindRenderbuffer( 36161, renderTargetProperties.__webglColorRenderbuffer );

						var glFormat = utils.convert( renderTarget.texture.format );
						var glType = utils.convert( renderTarget.texture.type );
						var glInternalFormat = getInternalFormat( renderTarget.texture.internalFormat, glFormat, glType );
						var samples = getRenderTargetSamples( renderTarget );
						_gl.renderbufferStorageMultisample( 36161, samples, glInternalFormat, renderTarget.width, renderTarget.height );

						_gl.bindFramebuffer( 36160, renderTargetProperties.__webglMultisampledFramebuffer );
						_gl.framebufferRenderbuffer( 36160, 36064, 36161, renderTargetProperties.__webglColorRenderbuffer );
						_gl.bindRenderbuffer( 36161, null );

						if ( renderTarget.depthBuffer ) {

							renderTargetProperties.__webglDepthRenderbuffer = _gl.createRenderbuffer();
							setupRenderBufferStorage( renderTargetProperties.__webglDepthRenderbuffer, renderTarget, true );

						}

						_gl.bindFramebuffer( 36160, null );


					} else {

						console.warn( 'THREE.WebGLRenderer: WebGLMultisampleRenderTarget can only be used with WebGL2.' );

					}

				} else if ( isMultiview ) {

					var width = renderTarget.width;
					var height = renderTarget.height;
					var numViews = renderTarget.numViews;

					_gl.bindFramebuffer( 36160, renderTargetProperties.__webglFramebuffer );

					var ext = extensions.get( 'OVR_multiview2' );

					info.memory.textures += 2;

					var colorTexture = _gl.createTexture();
					_gl.bindTexture( 35866, colorTexture );
					_gl.texParameteri( 35866, 10240, 9728 );
					_gl.texParameteri( 35866, 10241, 9728 );
					_gl.texImage3D( 35866, 0, 32856, width, height, numViews, 0, 6408, 5121, null );
					ext.framebufferTextureMultiviewOVR( 36160, 36064, colorTexture, 0, 0, numViews );

					var depthStencilTexture = _gl.createTexture();
					_gl.bindTexture( 35866, depthStencilTexture );
					_gl.texParameteri( 35866, 10240, 9728 );
					_gl.texParameteri( 35866, 10241, 9728 );
					_gl.texImage3D( 35866, 0, 35056, width, height, numViews, 0, 34041, 34042, null );
					ext.framebufferTextureMultiviewOVR( 36160, 33306, depthStencilTexture, 0, 0, numViews );

					var viewFramebuffers = new Array( numViews );
					for ( var i = 0; i < numViews; ++ i ) {

						viewFramebuffers[ i ] = _gl.createFramebuffer();
						_gl.bindFramebuffer( 36160, viewFramebuffers[ i ] );
						_gl.framebufferTextureLayer( 36160, 36064, colorTexture, 0, i );

					}

					renderTargetProperties.__webglColorTexture = colorTexture;
					renderTargetProperties.__webglDepthStencilTexture = depthStencilTexture;
					renderTargetProperties.__webglViewFramebuffers = viewFramebuffers;

					_gl.bindFramebuffer( 36160, null );
					_gl.bindTexture( 35866, null );

				}

			}

			// Setup color buffer

			if ( isCube ) {

				state.bindTexture( 34067, textureProperties.__webglTexture );
				setTextureParameters( 34067, renderTarget.texture, supportsMips );

				for ( var i = 0; i < 6; i ++ ) {

					setupFrameBufferTexture( renderTargetProperties.__webglFramebuffer[ i ], renderTarget, 36064, 34069 + i );

				}

				if ( textureNeedsGenerateMipmaps( renderTarget.texture, supportsMips ) ) {

					generateMipmap( 34067, renderTarget.texture, renderTarget.width, renderTarget.height );

				}

				state.bindTexture( 34067, null );

			} else if ( ! isMultiview ) {

				state.bindTexture( 3553, textureProperties.__webglTexture );
				setTextureParameters( 3553, renderTarget.texture, supportsMips );
				setupFrameBufferTexture( renderTargetProperties.__webglFramebuffer, renderTarget, 36064, 3553 );

				if ( textureNeedsGenerateMipmaps( renderTarget.texture, supportsMips ) ) {

					generateMipmap( 3553, renderTarget.texture, renderTarget.width, renderTarget.height );

				}

				state.bindTexture( 3553, null );

			}

			// Setup depth and stencil buffers

			if ( renderTarget.depthBuffer ) {

				setupDepthRenderbuffer( renderTarget );

			}

		}

		function updateRenderTargetMipmap( renderTarget ) {

			var texture = renderTarget.texture;
			var supportsMips = isPowerOfTwo( renderTarget ) || isWebGL2;

			if ( textureNeedsGenerateMipmaps( texture, supportsMips ) ) {

				var target = renderTarget.isWebGLCubeRenderTarget ? 34067 : 3553;
				var webglTexture = properties.get( texture ).__webglTexture;

				state.bindTexture( target, webglTexture );
				generateMipmap( target, texture, renderTarget.width, renderTarget.height );
				state.bindTexture( target, null );

			}

		}

		function updateMultisampleRenderTarget( renderTarget ) {

			if ( renderTarget.isWebGLMultisampleRenderTarget ) {

				if ( isWebGL2 ) {

					var renderTargetProperties = properties.get( renderTarget );

					_gl.bindFramebuffer( 36008, renderTargetProperties.__webglMultisampledFramebuffer );
					_gl.bindFramebuffer( 36009, renderTargetProperties.__webglFramebuffer );

					var width = renderTarget.width;
					var height = renderTarget.height;
					var mask = 16384;

					if ( renderTarget.depthBuffer ) { mask |= 256; }
					if ( renderTarget.stencilBuffer ) { mask |= 1024; }

					_gl.blitFramebuffer( 0, 0, width, height, 0, 0, width, height, mask, 9728 );

				} else {

					console.warn( 'THREE.WebGLRenderer: WebGLMultisampleRenderTarget can only be used with WebGL2.' );

				}

			}

		}

		function getRenderTargetSamples( renderTarget ) {

			return ( isWebGL2 && renderTarget.isWebGLMultisampleRenderTarget ) ?
				Math.min( maxSamples, renderTarget.samples ) : 0;

		}

		function updateVideoTexture( texture ) {

			var frame = info.render.frame;

			// Check the last frame we updated the VideoTexture

			if ( _videoTextures.get( texture ) !== frame ) {

				_videoTextures.set( texture, frame );
				texture.update();

			}

		}

		// backwards compatibility

		var warnedTexture2D = false;
		var warnedTextureCube = false;

		function safeSetTexture2D( texture, slot ) {

			if ( texture && texture.isWebGLRenderTarget ) {

				if ( warnedTexture2D === false ) {

					console.warn( "THREE.WebGLTextures.safeSetTexture2D: don't use render targets as textures. Use their .texture property instead." );
					warnedTexture2D = true;

				}

				texture = texture.texture;

			}

			setTexture2D( texture, slot );

		}

		function safeSetTextureCube( texture, slot ) {

			if ( texture && texture.isWebGLCubeRenderTarget ) {

				if ( warnedTextureCube === false ) {

					console.warn( "THREE.WebGLTextures.safeSetTextureCube: don't use cube render targets as textures. Use their .texture property instead." );
					warnedTextureCube = true;

				}

				texture = texture.texture;

			}

			// currently relying on the fact that WebGLCubeRenderTarget.texture is a Texture and NOT a CubeTexture
			// TODO: unify these code paths
			if ( ( texture && texture.isCubeTexture ) ||
				( Array.isArray( texture.image ) && texture.image.length === 6 ) ) {

				// CompressedTexture can have Array in image :/

				// this function alone should take care of cube textures
				setTextureCube( texture, slot );

			} else {

				// assumed: texture property of THREE.WebGLCubeRenderTarget
				setTextureCubeDynamic( texture, slot );

			}

		}

		//

		this.allocateTextureUnit = allocateTextureUnit;
		this.resetTextureUnits = resetTextureUnits;

		this.setTexture2D = setTexture2D;
		this.setTexture2DArray = setTexture2DArray;
		this.setTexture3D = setTexture3D;
		this.setTextureCube = setTextureCube;
		this.setTextureCubeDynamic = setTextureCubeDynamic;
		this.setupRenderTarget = setupRenderTarget;
		this.updateRenderTargetMipmap = updateRenderTargetMipmap;
		this.updateMultisampleRenderTarget = updateMultisampleRenderTarget;

		this.safeSetTexture2D = safeSetTexture2D;
		this.safeSetTextureCube = safeSetTextureCube;

	}

	/**
	 * @author thespite / http://www.twitter.com/thespite
	 */

	function WebGLUtils( gl, extensions, capabilities ) {

		var isWebGL2 = capabilities.isWebGL2;

		function convert( p ) {

			var extension;

			if ( p === UnsignedByteType ) { return 5121; }
			if ( p === UnsignedShort4444Type ) { return 32819; }
			if ( p === UnsignedShort5551Type ) { return 32820; }
			if ( p === UnsignedShort565Type ) { return 33635; }

			if ( p === ByteType ) { return 5120; }
			if ( p === ShortType ) { return 5122; }
			if ( p === UnsignedShortType ) { return 5123; }
			if ( p === IntType ) { return 5124; }
			if ( p === UnsignedIntType ) { return 5125; }
			if ( p === FloatType ) { return 5126; }

			if ( p === HalfFloatType ) {

				if ( isWebGL2 ) { return 5131; }

				extension = extensions.get( 'OES_texture_half_float' );

				if ( extension !== null ) {

					return extension.HALF_FLOAT_OES;

				} else {

					return null;

				}

			}

			if ( p === AlphaFormat ) { return 6406; }
			if ( p === RGBFormat ) { return 6407; }
			if ( p === RGBAFormat ) { return 6408; }
			if ( p === LuminanceFormat ) { return 6409; }
			if ( p === LuminanceAlphaFormat ) { return 6410; }
			if ( p === DepthFormat ) { return 6402; }
			if ( p === DepthStencilFormat ) { return 34041; }
			if ( p === RedFormat ) { return 6403; }

			// WebGL2 formats.

			if ( p === RedIntegerFormat ) { return 36244; }
			if ( p === RGFormat ) { return 33319; }
			if ( p === RGIntegerFormat ) { return 33320; }
			if ( p === RGBIntegerFormat ) { return 36248; }
			if ( p === RGBAIntegerFormat ) { return 36249; }

			if ( p === RGB_S3TC_DXT1_Format || p === RGBA_S3TC_DXT1_Format ||
				p === RGBA_S3TC_DXT3_Format || p === RGBA_S3TC_DXT5_Format ) {

				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;

				}

			}

			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;

				}

			}

			if ( p === RGB_ETC1_Format ) {

				extension = extensions.get( 'WEBGL_compressed_texture_etc1' );

				if ( extension !== null ) {

					return extension.COMPRESSED_RGB_ETC1_WEBGL;

				} else {

					return null;

				}

			}

			if ( p === RGB_ETC2_Format || p === RGBA_ETC2_EAC_Format ) {

				extension = extensions.get( 'WEBGL_compressed_texture_etc' );

				if ( extension !== null ) {

					if ( p === RGB_ETC2_Format ) { return extension.COMPRESSED_RGB8_ETC2; }
					if ( p === RGBA_ETC2_EAC_Format ) { return extension.COMPRESSED_RGBA8_ETC2_EAC; }

				}

			}

			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 ) {

					// TODO Complete?

					return p;

				} else {

					return null;

				}

			}

			if ( p === UnsignedInt248Type ) {

				if ( isWebGL2 ) { return 34042; }

				extension = extensions.get( 'WEBGL_depth_texture' );

				if ( extension !== null ) {

					return extension.UNSIGNED_INT_24_8_WEBGL;

				} else {

					return null;

				}

			}

		}

		return { convert: convert };

	}

	/**
	 * @author fernandojsg / http://fernandojsg.com
	 * @author Takahiro https://github.com/takahirox
	 */

	function WebGLMultiviewRenderTarget( width, height, numViews, options ) {

		WebGLRenderTarget.call( this, width, height, options );

		this.depthBuffer = false;
		this.stencilBuffer = false;

		this.numViews = numViews;

	}

	WebGLMultiviewRenderTarget.prototype = Object.assign( Object.create( WebGLRenderTarget.prototype ), {

		constructor: WebGLMultiviewRenderTarget,

		isWebGLMultiviewRenderTarget: true,

		copy: function ( source ) {

			WebGLRenderTarget.prototype.copy.call( this, source );

			this.numViews = source.numViews;

			return this;

		},

		setNumViews: function ( numViews ) {

			if ( this.numViews !== numViews ) {

				this.numViews = numViews;
				this.dispose();

			}

			return this;

		}

	} );

	/**
	 * @author fernandojsg / http://fernandojsg.com
	 * @author Takahiro https://github.com/takahirox
	 */

	function WebGLMultiview( renderer, gl ) {

		var DEFAULT_NUMVIEWS = 2;

		var extensions = renderer.extensions;
		var properties = renderer.properties;

		var renderTarget, currentRenderTarget;
		var mat3, mat4, cameraArray, renderSize;

		var available;
		var maxNumViews = 0;

		//

		function isAvailable() {

			if ( available === undefined ) {

				var extension = extensions.get( 'OVR_multiview2' );

				available = extension !== null && gl.getContextAttributes().antialias === false;

				if ( available ) {

					maxNumViews = gl.getParameter( extension.MAX_VIEWS_OVR );
					renderTarget = new WebGLMultiviewRenderTarget( 0, 0, DEFAULT_NUMVIEWS );

					renderSize = new Vector2();
					mat4 = [];
					mat3 = [];
					cameraArray = [];

					for ( var i = 0; i < maxNumViews; i ++ ) {

						mat4[ i ] = new Matrix4();
						mat3[ i ] = new Matrix3();

					}

				}

			}

			return available;

		}

		function getCameraArray( camera ) {

			if ( camera.isArrayCamera ) { return camera.cameras; }

			cameraArray[ 0 ] = camera;

			return cameraArray;

		}

		function updateCameraProjectionMatricesUniform( camera, uniforms ) {

			var cameras = getCameraArray( camera );

			for ( var i = 0; i < cameras.length; i ++ ) {

				mat4[ i ].copy( cameras[ i ].projectionMatrix );

			}

			uniforms.setValue( gl, 'projectionMatrices', mat4 );

		}

		function updateCameraViewMatricesUniform( camera, uniforms ) {

			var cameras = getCameraArray( camera );

			for ( var i = 0; i < cameras.length; i ++ ) {

				mat4[ i ].copy( cameras[ i ].matrixWorldInverse );

			}

			uniforms.setValue( gl, 'viewMatrices', mat4 );

		}

		function updateObjectMatricesUniforms( object, camera, uniforms ) {

			var cameras = getCameraArray( camera );

			for ( var i = 0; i < cameras.length; i ++ ) {

				mat4[ i ].multiplyMatrices( cameras[ i ].matrixWorldInverse, object.matrixWorld );
				mat3[ i ].getNormalMatrix( mat4[ i ] );

			}

			uniforms.setValue( gl, 'modelViewMatrices', mat4 );
			uniforms.setValue( gl, 'normalMatrices', mat3 );

		}

		function isMultiviewCompatible( camera ) {

			if ( camera.isArrayCamera === undefined ) { return true; }

			var cameras = camera.cameras;

			if ( cameras.length > maxNumViews ) { return false; }

			for ( var i = 1, il = cameras.length; i < il; i ++ ) {

				if ( cameras[ 0 ].viewport.z !== cameras[ i ].viewport.z ||
					cameras[ 0 ].viewport.w !== cameras[ i ].viewport.w ) { return false; }

			}

			return true;

		}

		function resizeRenderTarget( camera ) {

			if ( currentRenderTarget ) {

				renderSize.set( currentRenderTarget.width, currentRenderTarget.height );

			} else {

				renderer.getDrawingBufferSize( renderSize );

			}

			if ( camera.isArrayCamera ) {

				var viewport = camera.cameras[ 0 ].viewport;

				renderTarget.setSize( viewport.z, viewport.w );
				renderTarget.setNumViews( camera.cameras.length );

			} else {

				renderTarget.setSize( renderSize.x, renderSize.y );
				renderTarget.setNumViews( DEFAULT_NUMVIEWS );

			}

		}

		function attachCamera( camera ) {

			if ( isMultiviewCompatible( camera ) === false ) { return; }

			currentRenderTarget = renderer.getRenderTarget();
			resizeRenderTarget( camera );
			renderer.setRenderTarget( renderTarget );

		}

		function detachCamera( camera ) {

			if ( renderTarget !== renderer.getRenderTarget() ) { return; }

			renderer.setRenderTarget( currentRenderTarget );

			flush( camera );

		}

		function flush( camera ) {

			var srcRenderTarget = renderTarget;
			var numViews = srcRenderTarget.numViews;

			var srcFramebuffers = properties.get( srcRenderTarget ).__webglViewFramebuffers;

			var viewWidth = srcRenderTarget.width;
			var viewHeight = srcRenderTarget.height;

			if ( camera.isArrayCamera ) {

				for ( var i = 0; i < numViews; i ++ ) {

					var viewport = camera.cameras[ i ].viewport;

					var x1 = viewport.x;
					var y1 = viewport.y;
					var x2 = x1 + viewport.z;
					var y2 = y1 + viewport.w;

					gl.bindFramebuffer( 36008, srcFramebuffers[ i ] );
					gl.blitFramebuffer( 0, 0, viewWidth, viewHeight, x1, y1, x2, y2, 16384, 9728 );

				}

			} else {

				gl.bindFramebuffer( 36008, srcFramebuffers[ 0 ] );
				gl.blitFramebuffer( 0, 0, viewWidth, viewHeight, 0, 0, renderSize.x, renderSize.y, 16384, 9728 );

			}

		}

		this.isAvailable = isAvailable;
		this.attachCamera = attachCamera;
		this.detachCamera = detachCamera;
		this.updateCameraProjectionMatricesUniform = updateCameraProjectionMatricesUniform;
		this.updateCameraViewMatricesUniform = updateCameraViewMatricesUniform;
		this.updateObjectMatricesUniforms = updateObjectMatricesUniforms;

	}

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function ArrayCamera( array ) {

		PerspectiveCamera.call( this );

		this.cameras = array || [];

	}

	ArrayCamera.prototype = Object.assign( Object.create( PerspectiveCamera.prototype ), {

		constructor: ArrayCamera,

		isArrayCamera: true

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function Group() {

		Object3D.call( this );

		this.type = 'Group';

	}

	Group.prototype = Object.assign( Object.create( Object3D.prototype ), {

		constructor: Group,

		isGroup: true

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function WebXRManager( renderer, gl ) {

		var scope = this;

		var session = null;

		var framebufferScaleFactor = 1.0;

		var referenceSpace = null;
		var referenceSpaceType = 'local-floor';

		var pose = null;

		var controllers = [];
		var inputSourcesMap = new Map();

		//

		var cameraL = new PerspectiveCamera();
		cameraL.layers.enable( 1 );
		cameraL.viewport = new Vector4();

		var cameraR = new PerspectiveCamera();
		cameraR.layers.enable( 2 );
		cameraR.viewport = new Vector4();

		var cameraVR = new ArrayCamera( [ cameraL, cameraR ] );
		cameraVR.layers.enable( 1 );
		cameraVR.layers.enable( 2 );

		var _currentDepthNear = null;
		var _currentDepthFar = null;

		//

		this.enabled = false;

		this.isPresenting = false;

		this.getController = function ( id ) {

			var controller = controllers[ id ];

			if ( controller === undefined ) {

				controller = {};
				controllers[ id ] = controller;

			}

			if ( controller.targetRay === undefined ) {

				controller.targetRay = new Group();
				controller.targetRay.matrixAutoUpdate = false;
				controller.targetRay.visible = false;

			}

			return controller.targetRay;

		};

		this.getControllerGrip = function ( id ) {

			var controller = controllers[ id ];

			if ( controller === undefined ) {

				controller = {};
				controllers[ id ] = controller;

			}

			if ( controller.grip === undefined ) {

				controller.grip = new Group();
				controller.grip.matrixAutoUpdate = false;
				controller.grip.visible = false;

			}

			return controller.grip;

		};

		//

		function onSessionEvent( event ) {

			var controller = inputSourcesMap.get( event.inputSource );

			if ( controller ) {

				if ( controller.targetRay ) {

					controller.targetRay.dispatchEvent( { type: event.type } );

				}

				if ( controller.grip ) {

					controller.grip.dispatchEvent( { type: event.type } );

				}

			}

		}

		function onSessionEnd() {

			inputSourcesMap.forEach( function ( controller, inputSource ) {

				if ( controller.targetRay ) {

					controller.targetRay.dispatchEvent( { type: 'disconnected', data: inputSource } );
					controller.targetRay.visible = false;

				}

				if ( controller.grip ) {

					controller.grip.dispatchEvent( { type: 'disconnected', data: inputSource } );
					controller.grip.visible = false;

				}

			} );

			inputSourcesMap.clear();

			//

			renderer.setFramebuffer( null );
			renderer.setRenderTarget( renderer.getRenderTarget() ); // Hack #15830
			animation.stop();

			scope.isPresenting = false;

			scope.dispatchEvent( { type: 'sessionend' } );

		}

		function onRequestReferenceSpace( value ) {

			referenceSpace = value;

			animation.setContext( session );
			animation.start();

			scope.isPresenting = true;

			scope.dispatchEvent( { type: 'sessionstart' } );

		}

		this.setFramebufferScaleFactor = function ( value ) {

			framebufferScaleFactor = value;

			// Warn if function is used while presenting
			if ( scope.isPresenting == true ) {

				console.warn( "WebXRManager: Cannot change framebuffer scale while presenting VR content" );

			}

		};

		this.setReferenceSpaceType = function ( value ) {

			referenceSpaceType = value;

		};

		this.getReferenceSpace = function () {

			return referenceSpace;

		};

		this.getSession = function () {

			return session;

		};

		this.setSession = function ( value ) {

			session = value;

			if ( session !== null ) {

				session.addEventListener( 'select', onSessionEvent );
				session.addEventListener( 'selectstart', onSessionEvent );
				session.addEventListener( 'selectend', onSessionEvent );
				session.addEventListener( 'squeeze', onSessionEvent );
				session.addEventListener( 'squeezestart', onSessionEvent );
				session.addEventListener( 'squeezeend', onSessionEvent );
				session.addEventListener( 'end', onSessionEnd );

				var attributes = gl.getContextAttributes();

				var layerInit = {
					antialias: attributes.antialias,
					alpha: attributes.alpha,
					depth: attributes.depth,
					stencil: attributes.stencil,
					framebufferScaleFactor: framebufferScaleFactor
				};

				// eslint-disable-next-line no-undef
				var baseLayer = new XRWebGLLayer( session, gl, layerInit );

				session.updateRenderState( { baseLayer: baseLayer } );

				session.requestReferenceSpace( referenceSpaceType ).then( onRequestReferenceSpace );

				//

				session.addEventListener( 'inputsourceschange', updateInputSources );

			}

		};

		function updateInputSources( event ) {

			var inputSources = session.inputSources;

			// Assign inputSources to available controllers

			for ( var i = 0; i < controllers.length; i ++ ) {

				inputSourcesMap.set( inputSources[ i ], controllers[ i ] );

			}

			// Notify disconnected

			for ( var i = 0; i < event.removed.length; i ++ ) {

				var inputSource = event.removed[ i ];
				var controller = inputSourcesMap.get( inputSource );

				if ( controller ) {

					if ( controller.targetRay ) {

						controller.targetRay.dispatchEvent( { type: 'disconnected', data: inputSource } );

					}

					if ( controller.grip ) {

						controller.grip.dispatchEvent( { type: 'disconnected', data: inputSource } );

					}

					inputSourcesMap.delete( inputSource );

				}

			}

			// Notify connected

			for ( var i = 0; i < event.added.length; i ++ ) {

				var inputSource = event.added[ i ];
				var controller = inputSourcesMap.get( inputSource );

				if ( controller ) {

					if ( controller.targetRay ) {

						controller.targetRay.dispatchEvent( { type: 'connected', data: inputSource } );

					}

					if ( controller.grip ) {

						controller.grip.dispatchEvent( { type: 'connected', data: inputSource } );

					}

				}

			}

		}

		//

		var cameraLPos = new Vector3();
		var cameraRPos = new Vector3();

		/**
		 * @author jsantell / https://www.jsantell.com/
		 *
		 * Assumes 2 cameras that are parallel and share an X-axis, and that
		 * the cameras' projection and world matrices have already been set.
		 * And that near and far planes are identical for both cameras.
		 * Visualization of this technique: https://computergraphics.stackexchange.com/a/4765
		 */
		function setProjectionFromUnion( camera, cameraL, cameraR ) {

			cameraLPos.setFromMatrixPosition( cameraL.matrixWorld );
			cameraRPos.setFromMatrixPosition( cameraR.matrixWorld );

			var ipd = cameraLPos.distanceTo( cameraRPos );

			var projL = cameraL.projectionMatrix.elements;
			var projR = cameraR.projectionMatrix.elements;

			// VR systems will have identical far and near planes, and
			// most likely identical top and bottom frustum extents.
			// Use the left camera for these values.
			var near = projL[ 14 ] / ( projL[ 10 ] - 1 );
			var far = projL[ 14 ] / ( projL[ 10 ] + 1 );
			var topFov = ( projL[ 9 ] + 1 ) / projL[ 5 ];
			var bottomFov = ( projL[ 9 ] - 1 ) / projL[ 5 ];

			var leftFov = ( projL[ 8 ] - 1 ) / projL[ 0 ];
			var rightFov = ( projR[ 8 ] + 1 ) / projR[ 0 ];
			var left = near * leftFov;
			var right = near * rightFov;

			// Calculate the new camera's position offset from the
			// left camera. xOffset should be roughly half `ipd`.
			var zOffset = ipd / ( - leftFov + rightFov );
			var xOffset = zOffset * - leftFov;

			// TODO: Better way to apply this offset?
			cameraL.matrixWorld.decompose( camera.position, camera.quaternion, camera.scale );
			camera.translateX( xOffset );
			camera.translateZ( zOffset );
			camera.matrixWorld.compose( camera.position, camera.quaternion, camera.scale );
			camera.matrixWorldInverse.getInverse( camera.matrixWorld );

			// Find the union of the frustum values of the cameras and scale
			// the values so that the near plane's position does not change in world space,
			// although must now be relative to the new union camera.
			var near2 = near + zOffset;
			var far2 = far + zOffset;
			var left2 = left - xOffset;
			var right2 = right + ( ipd - xOffset );
			var top2 = topFov * far / far2 * near2;
			var bottom2 = bottomFov * far / far2 * near2;

			camera.projectionMatrix.makePerspective( left2, right2, top2, bottom2, near2, far2 );

		}

		function updateCamera( camera, parent ) {

			if ( parent === null ) {

				camera.matrixWorld.copy( camera.matrix );

			} else {

				camera.matrixWorld.multiplyMatrices( parent.matrixWorld, camera.matrix );

			}

			camera.matrixWorldInverse.getInverse( camera.matrixWorld );

		}

		this.getCamera = function ( camera ) {

			cameraVR.near = cameraR.near = cameraL.near = camera.near;
			cameraVR.far = cameraR.far = cameraL.far = camera.far;

			if ( _currentDepthNear !== cameraVR.near || _currentDepthFar !== cameraVR.far ) {

				// Note that the new renderState won't apply until the next frame. See #18320

				session.updateRenderState( {
					depthNear: cameraVR.near,
					depthFar: cameraVR.far
				} );

				_currentDepthNear = cameraVR.near;
				_currentDepthFar = cameraVR.far;

			}

			var parent = camera.parent;
			var cameras = cameraVR.cameras;

			updateCamera( cameraVR, parent );

			for ( var i = 0; i < cameras.length; i ++ ) {

				updateCamera( cameras[ i ], parent );

			}

			// update camera and its children

			camera.matrixWorld.copy( cameraVR.matrixWorld );

			var children = camera.children;

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

				children[ i ].updateMatrixWorld( true );

			}

			setProjectionFromUnion( cameraVR, cameraL, cameraR );

			return cameraVR;

		};

		// Animation Loop

		var onAnimationFrameCallback = null;

		function onAnimationFrame( time, frame ) {

			pose = frame.getViewerPose( referenceSpace );

			if ( pose !== null ) {

				var views = pose.views;
				var baseLayer = session.renderState.baseLayer;

				renderer.setFramebuffer( baseLayer.framebuffer );

				for ( var i = 0; i < views.length; i ++ ) {

					var view = views[ i ];
					var viewport = baseLayer.getViewport( view );

					var camera = cameraVR.cameras[ i ];
					camera.matrix.fromArray( view.transform.matrix );
					camera.projectionMatrix.fromArray( view.projectionMatrix );
					camera.viewport.set( viewport.x, viewport.y, viewport.width, viewport.height );

					if ( i === 0 ) {

						cameraVR.matrix.copy( camera.matrix );

					}

				}

			}

			//

			var inputSources = session.inputSources;

			for ( var i = 0; i < controllers.length; i ++ ) {

				var controller = controllers[ i ];

				var inputSource = inputSources[ i ];

				var inputPose = null;
				var gripPose = null;

				if ( inputSource ) {

					if ( controller.targetRay ) {

						inputPose = frame.getPose( inputSource.targetRaySpace, referenceSpace );

						if ( inputPose !== null ) {

							controller.targetRay.matrix.fromArray( inputPose.transform.matrix );
							controller.targetRay.matrix.decompose( controller.targetRay.position, controller.targetRay.rotation, controller.targetRay.scale );

						}

					}

					if ( controller.grip && inputSource.gripSpace ) {

						gripPose = frame.getPose( inputSource.gripSpace, referenceSpace );

						if ( gripPose !== null ) {

							controller.grip.matrix.fromArray( gripPose.transform.matrix );
							controller.grip.matrix.decompose( controller.grip.position, controller.grip.rotation, controller.grip.scale );

						}

					}

				}

				if ( controller.targetRay ) {

					controller.targetRay.visible = inputPose !== null;

				}

				if ( controller.grip ) {

					controller.grip.visible = gripPose !== null;

				}

			}

			if ( onAnimationFrameCallback ) { onAnimationFrameCallback( time, frame ); }

		}

		var animation = new WebGLAnimation();
		animation.setAnimationLoop( onAnimationFrame );

		this.setAnimationLoop = function ( callback ) {

			onAnimationFrameCallback = callback;

		};

		this.dispose = function () {};

	}

	Object.assign( WebXRManager.prototype, EventDispatcher.prototype );

	/**
	 * @author supereggbert / http://www.paulbrunt.co.uk/
	 * @author mrdoob / http://mrdoob.com/
	 * @author alteredq / http://alteredqualia.com/
	 * @author szimek / https://github.com/szimek/
	 * @author tschw
	 */

	function WebGLRenderer( parameters ) {

		parameters = parameters || {};

		var _canvas = parameters.canvas !== undefined ? parameters.canvas : document.createElementNS( 'http://www.w3.org/1999/xhtml', 'canvas' ),
			_context = parameters.context !== undefined ? parameters.context : null,

			_alpha = parameters.alpha !== undefined ? parameters.alpha : false,
			_depth = parameters.depth !== undefined ? parameters.depth : true,
			_stencil = parameters.stencil !== undefined ? parameters.stencil : true,
			_antialias = parameters.antialias !== undefined ? parameters.antialias : false,
			_premultipliedAlpha = parameters.premultipliedAlpha !== undefined ? parameters.premultipliedAlpha : true,
			_preserveDrawingBuffer = parameters.preserveDrawingBuffer !== undefined ? parameters.preserveDrawingBuffer : false,
			_powerPreference = parameters.powerPreference !== undefined ? parameters.powerPreference : 'default',
			_failIfMajorPerformanceCaveat = parameters.failIfMajorPerformanceCaveat !== undefined ? parameters.failIfMajorPerformanceCaveat : false;

		var currentRenderList = null;
		var currentRenderState = null;

		// public properties

		this.domElement = _canvas;

		// Debug configuration container
		this.debug = {

			/**
			 * Enables error checking and reporting when shader programs are being compiled
			 * @type {boolean}
			 */
			checkShaderErrors: true
		};

		// clearing

		this.autoClear = true;
		this.autoClearColor = true;
		this.autoClearDepth = true;
		this.autoClearStencil = true;

		// scene graph

		this.sortObjects = true;

		// user-defined clipping

		this.clippingPlanes = [];
		this.localClippingEnabled = false;

		// physically based shading

		this.gammaFactor = 2.0;	// for backwards compatibility
		this.outputEncoding = LinearEncoding;

		// physical lights

		this.physicallyCorrectLights = false;

		// tone mapping

		this.toneMapping = LinearToneMapping;
		this.toneMappingExposure = 1.0;
		this.toneMappingWhitePoint = 1.0;

		// morphs

		this.maxMorphTargets = 8;
		this.maxMorphNormals = 4;

		// internal properties

		var _this = this,

			_isContextLost = false,

			// internal state cache

			_framebuffer = null,

			_currentActiveCubeFace = 0,
			_currentActiveMipmapLevel = 0,
			_currentRenderTarget = null,
			_currentFramebuffer = null,
			_currentMaterialId = - 1,

			// geometry and program caching

			_currentGeometryProgram = {
				geometry: null,
				program: null,
				wireframe: false
			},

			_currentCamera = null,
			_currentArrayCamera = null,

			_currentViewport = new Vector4(),
			_currentScissor = new Vector4(),
			_currentScissorTest = null,

			//

			_width = _canvas.width,
			_height = _canvas.height,

			_pixelRatio = 1,
			_opaqueSort = null,
			_transparentSort = null,

			_viewport = new Vector4( 0, 0, _width, _height ),
			_scissor = new Vector4( 0, 0, _width, _height ),
			_scissorTest = false,

			// frustum

			_frustum = new Frustum(),

			// clipping

			_clipping = new WebGLClipping(),
			_clippingEnabled = false,
			_localClippingEnabled = false,

			// camera matrices cache

			_projScreenMatrix = new Matrix4(),

			_vector3 = new Vector3();

		function getTargetPixelRatio() {

			return _currentRenderTarget === null ? _pixelRatio : 1;

		}

		// initialize

		var _gl;

		try {

			var contextAttributes = {
				alpha: _alpha,
				depth: _depth,
				stencil: _stencil,
				antialias: _antialias,
				premultipliedAlpha: _premultipliedAlpha,
				preserveDrawingBuffer: _preserveDrawingBuffer,
				powerPreference: _powerPreference,
				failIfMajorPerformanceCaveat: _failIfMajorPerformanceCaveat,
				xrCompatible: true
			};

			// event listeners must be registered before WebGL context is created, see #12753

			_canvas.addEventListener( 'webglcontextlost', onContextLost, false );
			_canvas.addEventListener( 'webglcontextrestored', onContextRestore, false );

			_gl = _context || _canvas.getContext( 'webgl', contextAttributes ) || _canvas.getContext( 'experimental-webgl', contextAttributes );

			if ( _gl === null ) {

				if ( _canvas.getContext( 'webgl' ) !== null ) {

					throw new Error( 'Error creating WebGL context with your selected attributes.' );

				} else {

					throw new Error( 'Error creating WebGL context.' );

				}

			}

			// Some experimental-webgl implementations do not have getShaderPrecisionFormat

			if ( _gl.getShaderPrecisionFormat === undefined ) {

				_gl.getShaderPrecisionFormat = function () {

					return { 'rangeMin': 1, 'rangeMax': 1, 'precision': 1 };

				};

			}

		} catch ( error ) {

			console.error( 'THREE.WebGLRenderer: ' + error.message );
			throw error;

		}

		var extensions, capabilities, state, info;
		var properties, textures, attributes, geometries, objects;
		var programCache, renderLists, renderStates;

		var background, morphtargets, bufferRenderer, indexedBufferRenderer;

		var utils;

		function initGLContext() {

			extensions = new WebGLExtensions( _gl );

			capabilities = new WebGLCapabilities( _gl, extensions, parameters );

			if ( capabilities.isWebGL2 === false ) {

				extensions.get( 'WEBGL_depth_texture' );
				extensions.get( 'OES_texture_float' );
				extensions.get( 'OES_texture_half_float' );
				extensions.get( 'OES_texture_half_float_linear' );
				extensions.get( 'OES_standard_derivatives' );
				extensions.get( 'OES_element_index_uint' );
				extensions.get( 'ANGLE_instanced_arrays' );

			}

			extensions.get( 'OES_texture_float_linear' );

			utils = new WebGLUtils( _gl, extensions, capabilities );

			state = new WebGLState( _gl, extensions, capabilities );
			state.scissor( _currentScissor.copy( _scissor ).multiplyScalar( _pixelRatio ).floor() );
			state.viewport( _currentViewport.copy( _viewport ).multiplyScalar( _pixelRatio ).floor() );

			info = new WebGLInfo( _gl );
			properties = new WebGLProperties();
			textures = new WebGLTextures( _gl, extensions, state, properties, capabilities, utils, info );
			attributes = new WebGLAttributes( _gl, capabilities );
			geometries = new WebGLGeometries( _gl, attributes, info );
			objects = new WebGLObjects( _gl, geometries, attributes, info );
			morphtargets = new WebGLMorphtargets( _gl );
			programCache = new WebGLPrograms( _this, extensions, capabilities );
			renderLists = new WebGLRenderLists();
			renderStates = new WebGLRenderStates();

			background = new WebGLBackground( _this, state, objects, _premultipliedAlpha );

			bufferRenderer = new WebGLBufferRenderer( _gl, extensions, info, capabilities );
			indexedBufferRenderer = new WebGLIndexedBufferRenderer( _gl, extensions, info, capabilities );

			info.programs = programCache.programs;

			_this.capabilities = capabilities;
			_this.extensions = extensions;
			_this.properties = properties;
			_this.renderLists = renderLists;
			_this.state = state;
			_this.info = info;

		}

		initGLContext();

		// xr

		var xr = new WebXRManager( _this, _gl );

		this.xr = xr;

		// Multiview

		var multiview = new WebGLMultiview( _this, _gl );

		// shadow map

		var shadowMap = new WebGLShadowMap( _this, objects, capabilities.maxTextureSize );

		this.shadowMap = shadowMap;

		// API

		this.getContext = function () {

			return _gl;

		};

		this.getContextAttributes = function () {

			return _gl.getContextAttributes();

		};

		this.forceContextLoss = function () {

			var extension = extensions.get( 'WEBGL_lose_context' );
			if ( extension ) { extension.loseContext(); }

		};

		this.forceContextRestore = function () {

			var extension = extensions.get( 'WEBGL_lose_context' );
			if ( extension ) { extension.restoreContext(); }

		};

		this.getPixelRatio = function () {

			return _pixelRatio;

		};

		this.setPixelRatio = function ( value ) {

			if ( value === undefined ) { return; }

			_pixelRatio = value;

			this.setSize( _width, _height, false );

		};

		this.getSize = function ( target ) {

			if ( target === undefined ) {

				console.warn( 'WebGLRenderer: .getsize() now requires a Vector2 as an argument' );

				target = new Vector2();

			}

			return target.set( _width, _height );

		};

		this.setSize = function ( width, height, updateStyle ) {

			if ( xr.isPresenting ) {

				console.warn( 'THREE.WebGLRenderer: Can\'t change size while VR device is presenting.' );
				return;

			}

			_width = width;
			_height = height;

			_canvas.width = Math.floor( width * _pixelRatio );
			_canvas.height = Math.floor( height * _pixelRatio );

			if ( updateStyle !== false ) {

				_canvas.style.width = width + 'px';
				_canvas.style.height = height + 'px';

			}

			this.setViewport( 0, 0, width, height );

		};

		this.getDrawingBufferSize = function ( target ) {

			if ( target === undefined ) {

				console.warn( 'WebGLRenderer: .getdrawingBufferSize() now requires a Vector2 as an argument' );

				target = new Vector2();

			}

			return target.set( _width * _pixelRatio, _height * _pixelRatio ).floor();

		};

		this.setDrawingBufferSize = function ( width, height, pixelRatio ) {

			_width = width;
			_height = height;

			_pixelRatio = pixelRatio;

			_canvas.width = Math.floor( width * pixelRatio );
			_canvas.height = Math.floor( height * pixelRatio );

			this.setViewport( 0, 0, width, height );

		};

		this.getCurrentViewport = function ( target ) {

			if ( target === undefined ) {

				console.warn( 'WebGLRenderer: .getCurrentViewport() now requires a Vector4 as an argument' );

				target = new Vector4();

			}

			return target.copy( _currentViewport );

		};

		this.getViewport = function ( target ) {

			return target.copy( _viewport );

		};

		this.setViewport = function ( x, y, width, height ) {

			if ( x.isVector4 ) {

				_viewport.set( x.x, x.y, x.z, x.w );

			} else {

				_viewport.set( x, y, width, height );

			}

			state.viewport( _currentViewport.copy( _viewport ).multiplyScalar( _pixelRatio ).floor() );

		};

		this.getScissor = function ( target ) {

			return target.copy( _scissor );

		};

		this.setScissor = function ( x, y, width, height ) {

			if ( x.isVector4 ) {

				_scissor.set( x.x, x.y, x.z, x.w );

			} else {

				_scissor.set( x, y, width, height );

			}

			state.scissor( _currentScissor.copy( _scissor ).multiplyScalar( _pixelRatio ).floor() );

		};

		this.getScissorTest = function () {

			return _scissorTest;

		};

		this.setScissorTest = function ( boolean ) {

			state.setScissorTest( _scissorTest = boolean );

		};

		this.setOpaqueSort = function ( method ) {

			_opaqueSort = method;

		};

		this.setTransparentSort = function ( method ) {

			_transparentSort = method;

		};

		// Clearing

		this.getClearColor = function () {

			return background.getClearColor();

		};

		this.setClearColor = function () {

			background.setClearColor.apply( background, arguments );

		};

		this.getClearAlpha = function () {

			return background.getClearAlpha();

		};

		this.setClearAlpha = function () {

			background.setClearAlpha.apply( background, arguments );

		};

		this.clear = function ( color, depth, stencil ) {

			var bits = 0;

			if ( color === undefined || color ) { bits |= 16384; }
			if ( depth === undefined || depth ) { bits |= 256; }
			if ( stencil === undefined || stencil ) { bits |= 1024; }

			_gl.clear( bits );

		};

		this.clearColor = function () {

			this.clear( true, false, false );

		};

		this.clearDepth = function () {

			this.clear( false, true, false );

		};

		this.clearStencil = function () {

			this.clear( false, false, true );

		};

		//

		this.dispose = function () {

			_canvas.removeEventListener( 'webglcontextlost', onContextLost, false );
			_canvas.removeEventListener( 'webglcontextrestored', onContextRestore, false );

			renderLists.dispose();
			renderStates.dispose();
			properties.dispose();
			objects.dispose();

			xr.dispose();

			animation.stop();

		};

		// Events

		function onContextLost( event ) {

			event.preventDefault();

			console.log( 'THREE.WebGLRenderer: Context Lost.' );

			_isContextLost = true;

		}

		function onContextRestore( /* event */ ) {

			console.log( 'THREE.WebGLRenderer: Context Restored.' );

			_isContextLost = false;

			initGLContext();

		}

		function onMaterialDispose( event ) {

			var material = event.target;

			material.removeEventListener( 'dispose', onMaterialDispose );

			deallocateMaterial( material );

		}

		// Buffer deallocation

		function deallocateMaterial( material ) {

			releaseMaterialProgramReference( material );

			properties.remove( material );

		}


		function releaseMaterialProgramReference( material ) {

			var programInfo = properties.get( material ).program;

			material.program = undefined;

			if ( programInfo !== undefined ) {

				programCache.releaseProgram( programInfo );

			}

		}

		// Buffer rendering

		function renderObjectImmediate( object, program ) {

			object.render( function ( object ) {

				_this.renderBufferImmediate( object, program );

			} );

		}

		this.renderBufferImmediate = function ( object, program ) {

			state.initAttributes();

			var buffers = properties.get( object );

			if ( object.hasPositions && ! buffers.position ) { buffers.position = _gl.createBuffer(); }
			if ( object.hasNormals && ! buffers.normal ) { buffers.normal = _gl.createBuffer(); }
			if ( object.hasUvs && ! buffers.uv ) { buffers.uv = _gl.createBuffer(); }
			if ( object.hasColors && ! buffers.color ) { buffers.color = _gl.createBuffer(); }

			var programAttributes = program.getAttributes();

			if ( object.hasPositions ) {

				_gl.bindBuffer( 34962, buffers.position );
				_gl.bufferData( 34962, object.positionArray, 35048 );

				state.enableAttribute( programAttributes.position );
				_gl.vertexAttribPointer( programAttributes.position, 3, 5126, false, 0, 0 );

			}

			if ( object.hasNormals ) {

				_gl.bindBuffer( 34962, buffers.normal );
				_gl.bufferData( 34962, object.normalArray, 35048 );

				state.enableAttribute( programAttributes.normal );
				_gl.vertexAttribPointer( programAttributes.normal, 3, 5126, false, 0, 0 );

			}

			if ( object.hasUvs ) {

				_gl.bindBuffer( 34962, buffers.uv );
				_gl.bufferData( 34962, object.uvArray, 35048 );

				state.enableAttribute( programAttributes.uv );
				_gl.vertexAttribPointer( programAttributes.uv, 2, 5126, false, 0, 0 );

			}

			if ( object.hasColors ) {

				_gl.bindBuffer( 34962, buffers.color );
				_gl.bufferData( 34962, object.colorArray, 35048 );

				state.enableAttribute( programAttributes.color );
				_gl.vertexAttribPointer( programAttributes.color, 3, 5126, false, 0, 0 );

			}

			state.disableUnusedAttributes();

			_gl.drawArrays( 4, 0, object.count );

			object.count = 0;

		};

		var tempScene = new Scene();

		this.renderBufferDirect = function ( camera, scene, geometry, material, object, group ) {

			if ( scene === null ) { scene = tempScene; } // renderBufferDirect second parameter used to be fog (could be null)

			var frontFaceCW = ( object.isMesh && object.matrixWorld.determinant() < 0 );

			var program = setProgram( camera, scene, material, object );

			state.setMaterial( material, frontFaceCW );

			var updateBuffers = false;

			if ( _currentGeometryProgram.geometry !== geometry.id ||
				_currentGeometryProgram.program !== program.id ||
				_currentGeometryProgram.wireframe !== ( material.wireframe === true ) ) {

				_currentGeometryProgram.geometry = geometry.id;
				_currentGeometryProgram.program = program.id;
				_currentGeometryProgram.wireframe = material.wireframe === true;
				updateBuffers = true;

			}

			if ( material.morphTargets || material.morphNormals ) {

				morphtargets.update( object, geometry, material, program );

				updateBuffers = true;

			}

			//

			var index = geometry.index;
			var position = geometry.attributes.position;

			//

			if ( index === null ) {

				if ( position === undefined || position.count === 0 ) { return; }

			} else if ( index.count === 0 ) {

				return;

			}

			//

			var rangeFactor = 1;

			if ( material.wireframe === true ) {

				index = geometries.getWireframeAttribute( geometry );
				rangeFactor = 2;

			}

			var attribute;
			var renderer = bufferRenderer;

			if ( index !== null ) {

				attribute = attributes.get( index );

				renderer = indexedBufferRenderer;
				renderer.setIndex( attribute );

			}

			if ( updateBuffers ) {

				setupVertexAttributes( object, geometry, material, program );

				if ( index !== null ) {

					_gl.bindBuffer( 34963, attribute.buffer );

				}

			}

			//

			var dataCount = ( index !== null ) ? index.count : position.count;

			var rangeStart = geometry.drawRange.start * rangeFactor;
			var rangeCount = geometry.drawRange.count * rangeFactor;

			var groupStart = group !== null ? group.start * rangeFactor : 0;
			var groupCount = group !== null ? group.count * rangeFactor : Infinity;

			var drawStart = Math.max( rangeStart, groupStart );
			var drawEnd = Math.min( dataCount, rangeStart + rangeCount, groupStart + groupCount ) - 1;

			var drawCount = Math.max( 0, drawEnd - drawStart + 1 );

			if ( drawCount === 0 ) { return; }

			//

			if ( object.isMesh ) {

				if ( material.wireframe === true ) {

					state.setLineWidth( material.wireframeLinewidth * getTargetPixelRatio() );
					renderer.setMode( 1 );

				} else {

					renderer.setMode( 4 );

				}

			} else if ( object.isLine ) {

				var lineWidth = material.linewidth;

				if ( lineWidth === undefined ) { lineWidth = 1; } // Not using Line*Material

				state.setLineWidth( lineWidth * getTargetPixelRatio() );

				if ( object.isLineSegments ) {

					renderer.setMode( 1 );

				} else if ( object.isLineLoop ) {

					renderer.setMode( 2 );

				} else {

					renderer.setMode( 3 );

				}

			} else if ( object.isPoints ) {

				renderer.setMode( 0 );

			} else if ( object.isSprite ) {

				renderer.setMode( 4 );

			}

			if ( object.isInstancedMesh ) {

				renderer.renderInstances( geometry, drawStart, drawCount, object.count );

			} else if ( geometry.isInstancedBufferGeometry ) {

				renderer.renderInstances( geometry, drawStart, drawCount, geometry.maxInstancedCount );

			} else {

				renderer.render( drawStart, drawCount );

			}

		};

		function setupVertexAttributes( object, geometry, material, program ) {

			if ( capabilities.isWebGL2 === false && ( object.isInstancedMesh || geometry.isInstancedBufferGeometry ) ) {

				if ( extensions.get( 'ANGLE_instanced_arrays' ) === null ) { return; }

			}

			state.initAttributes();

			var geometryAttributes = geometry.attributes;

			var programAttributes = program.getAttributes();

			var materialDefaultAttributeValues = material.defaultAttributeValues;

			for ( var name in programAttributes ) {

				var programAttribute = programAttributes[ name ];

				if ( programAttribute >= 0 ) {

					var geometryAttribute = geometryAttributes[ name ];

					if ( geometryAttribute !== undefined ) {

						var normalized = geometryAttribute.normalized;
						var size = geometryAttribute.itemSize;

						var attribute = attributes.get( geometryAttribute );

						// TODO Attribute may not be available on context restore

						if ( attribute === undefined ) { continue; }

						var buffer = attribute.buffer;
						var type = attribute.type;
						var bytesPerElement = attribute.bytesPerElement;

						if ( geometryAttribute.isInterleavedBufferAttribute ) {

							var data = geometryAttribute.data;
							var stride = data.stride;
							var offset = geometryAttribute.offset;

							if ( data && data.isInstancedInterleavedBuffer ) {

								state.enableAttributeAndDivisor( programAttribute, data.meshPerAttribute );

								if ( geometry.maxInstancedCount === undefined ) {

									geometry.maxInstancedCount = data.meshPerAttribute * data.count;

								}

							} else {

								state.enableAttribute( programAttribute );

							}

							_gl.bindBuffer( 34962, buffer );
							_gl.vertexAttribPointer( programAttribute, size, type, normalized, stride * bytesPerElement, offset * bytesPerElement );

						} else {

							if ( geometryAttribute.isInstancedBufferAttribute ) {

								state.enableAttributeAndDivisor( programAttribute, geometryAttribute.meshPerAttribute );

								if ( geometry.maxInstancedCount === undefined ) {

									geometry.maxInstancedCount = geometryAttribute.meshPerAttribute * geometryAttribute.count;

								}

							} else {

								state.enableAttribute( programAttribute );

							}

							_gl.bindBuffer( 34962, buffer );
							_gl.vertexAttribPointer( programAttribute, size, type, normalized, 0, 0 );

						}

					} else if ( name === 'instanceMatrix' ) {

						var attribute = attributes.get( object.instanceMatrix );

						// TODO Attribute may not be available on context restore

						if ( attribute === undefined ) { continue; }

						var buffer = attribute.buffer;
						var type = attribute.type;

						state.enableAttributeAndDivisor( programAttribute + 0, 1 );
						state.enableAttributeAndDivisor( programAttribute + 1, 1 );
						state.enableAttributeAndDivisor( programAttribute + 2, 1 );
						state.enableAttributeAndDivisor( programAttribute + 3, 1 );

						_gl.bindBuffer( 34962, buffer );

						_gl.vertexAttribPointer( programAttribute + 0, 4, type, false, 64, 0 );
						_gl.vertexAttribPointer( programAttribute + 1, 4, type, false, 64, 16 );
						_gl.vertexAttribPointer( programAttribute + 2, 4, type, false, 64, 32 );
						_gl.vertexAttribPointer( programAttribute + 3, 4, type, false, 64, 48 );

					} else if ( materialDefaultAttributeValues !== undefined ) {

						var value = materialDefaultAttributeValues[ name ];

						if ( value !== undefined ) {

							switch ( value.length ) {

								case 2:
									_gl.vertexAttrib2fv( programAttribute, value );
									break;

								case 3:
									_gl.vertexAttrib3fv( programAttribute, value );
									break;

								case 4:
									_gl.vertexAttrib4fv( programAttribute, value );
									break;

								default:
									_gl.vertexAttrib1fv( programAttribute, value );

							}

						}

					}

				}

			}

			state.disableUnusedAttributes();

		}

		// Compile

		this.compile = function ( scene, camera ) {

			currentRenderState = renderStates.get( scene, camera );
			currentRenderState.init();

			scene.traverse( function ( object ) {

				if ( object.isLight ) {

					currentRenderState.pushLight( object );

					if ( object.castShadow ) {

						currentRenderState.pushShadow( object );

					}

				}

			} );

			currentRenderState.setupLights( camera );

			var compiled = {};

			scene.traverse( function ( object ) {

				if ( object.material ) {

					if ( Array.isArray( object.material ) ) {

						for ( var i = 0; i < object.material.length; i ++ ) {

							if ( object.material[ i ].uuid in compiled === false ) {

								initMaterial( object.material[ i ], scene, object );
								compiled[ object.material[ i ].uuid ] = true;

							}

						}

					} else if ( object.material.uuid in compiled === false ) {

						initMaterial( object.material, scene, object );
						compiled[ object.material.uuid ] = true;

					}

				}

			} );

		};

		// Animation Loop

		var onAnimationFrameCallback = null;

		function onAnimationFrame( time ) {

			if ( xr.isPresenting ) { return; }
			if ( onAnimationFrameCallback ) { onAnimationFrameCallback( time ); }

		}

		var animation = new WebGLAnimation();
		animation.setAnimationLoop( onAnimationFrame );

		if ( typeof window !== 'undefined' ) { animation.setContext( window ); }

		this.setAnimationLoop = function ( callback ) {

			onAnimationFrameCallback = callback;
			xr.setAnimationLoop( callback );

			animation.start();

		};

		// Rendering

		this.render = function ( scene, camera ) {

			var renderTarget, forceClear;

			if ( arguments[ 2 ] !== undefined ) {

				console.warn( 'THREE.WebGLRenderer.render(): the renderTarget argument has been removed. Use .setRenderTarget() instead.' );
				renderTarget = arguments[ 2 ];

			}

			if ( arguments[ 3 ] !== undefined ) {

				console.warn( 'THREE.WebGLRenderer.render(): the forceClear argument has been removed. Use .clear() instead.' );
				forceClear = arguments[ 3 ];

			}

			if ( ! ( camera && camera.isCamera ) ) {

				console.error( 'THREE.WebGLRenderer.render: camera is not an instance of THREE.Camera.' );
				return;

			}

			if ( _isContextLost ) { return; }

			// reset caching for this frame

			_currentGeometryProgram.geometry = null;
			_currentGeometryProgram.program = null;
			_currentGeometryProgram.wireframe = false;
			_currentMaterialId = - 1;
			_currentCamera = null;

			// update scene graph

			if ( scene.autoUpdate === true ) { scene.updateMatrixWorld(); }

			// update camera matrices and frustum

			if ( camera.parent === null ) { camera.updateMatrixWorld(); }

			if ( xr.enabled && xr.isPresenting ) {

				camera = xr.getCamera( camera );

			}

			//

			currentRenderState = renderStates.get( scene, camera );
			currentRenderState.init();

			scene.onBeforeRender( _this, scene, camera, renderTarget || _currentRenderTarget );

			_projScreenMatrix.multiplyMatrices( camera.projectionMatrix, camera.matrixWorldInverse );
			_frustum.setFromProjectionMatrix( _projScreenMatrix );

			_localClippingEnabled = this.localClippingEnabled;
			_clippingEnabled = _clipping.init( this.clippingPlanes, _localClippingEnabled, camera );

			currentRenderList = renderLists.get( scene, camera );
			currentRenderList.init();

			projectObject( scene, camera, 0, _this.sortObjects );

			currentRenderList.finish();

			if ( _this.sortObjects === true ) {

				currentRenderList.sort( _opaqueSort, _transparentSort );

			}

			//

			if ( _clippingEnabled ) { _clipping.beginShadows(); }

			var shadowsArray = currentRenderState.state.shadowsArray;

			shadowMap.render( shadowsArray, scene, camera );

			currentRenderState.setupLights( camera );

			if ( _clippingEnabled ) { _clipping.endShadows(); }

			//

			if ( this.info.autoReset ) { this.info.reset(); }

			if ( renderTarget !== undefined ) {

				this.setRenderTarget( renderTarget );

			}

			if ( xr.enabled && multiview.isAvailable() ) {

				multiview.attachCamera( camera );

			}

			//

			background.render( currentRenderList, scene, camera, forceClear );

			// render scene

			var opaqueObjects = currentRenderList.opaque;
			var transparentObjects = currentRenderList.transparent;

			if ( scene.overrideMaterial ) {

				var overrideMaterial = scene.overrideMaterial;

				if ( opaqueObjects.length ) { renderObjects( opaqueObjects, scene, camera, overrideMaterial ); }
				if ( transparentObjects.length ) { renderObjects( transparentObjects, scene, camera, overrideMaterial ); }

			} else {

				// opaque pass (front-to-back order)

				if ( opaqueObjects.length ) { renderObjects( opaqueObjects, scene, camera ); }

				// transparent pass (back-to-front order)

				if ( transparentObjects.length ) { renderObjects( transparentObjects, scene, camera ); }

			}

			//

			scene.onAfterRender( _this, scene, camera );

			//

			if ( _currentRenderTarget !== null ) {

				// Generate mipmap if we're using any kind of mipmap filtering

				textures.updateRenderTargetMipmap( _currentRenderTarget );

				// resolve multisample renderbuffers to a single-sample texture if necessary

				textures.updateMultisampleRenderTarget( _currentRenderTarget );

			}

			// Ensure depth buffer writing is enabled so it can be cleared on next render

			state.buffers.depth.setTest( true );
			state.buffers.depth.setMask( true );
			state.buffers.color.setMask( true );

			state.setPolygonOffset( false );

			if ( xr.enabled ) {

				if ( multiview.isAvailable() ) {

					multiview.detachCamera( camera );

				}

			}

			// _gl.finish();

			currentRenderList = null;
			currentRenderState = null;

		};

		function projectObject( object, camera, groupOrder, sortObjects ) {

			if ( object.visible === false ) { return; }

			var 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 ) {

					currentRenderState.pushLight( object );

					if ( object.castShadow ) {

						currentRenderState.pushShadow( object );

					}

				} else if ( object.isSprite ) {

					if ( ! object.frustumCulled || _frustum.intersectsSprite( object ) ) {

						if ( sortObjects ) {

							_vector3.setFromMatrixPosition( object.matrixWorld )
								.applyMatrix4( _projScreenMatrix );

						}

						var geometry = objects.update( object );
						var material = object.material;

						if ( material.visible ) {

							currentRenderList.push( object, geometry, material, groupOrder, _vector3.z, null );

						}

					}

				} else if ( object.isImmediateRenderObject ) {

					if ( sortObjects ) {

						_vector3.setFromMatrixPosition( object.matrixWorld )
							.applyMatrix4( _projScreenMatrix );

					}

					currentRenderList.push( object, null, object.material, groupOrder, _vector3.z, null );

				} else if ( object.isMesh || object.isLine || object.isPoints ) {

					if ( object.isSkinnedMesh ) {

						// update skeleton only once in a frame

						if ( object.skeleton.frame !== info.render.frame ) {

							object.skeleton.update();
							object.skeleton.frame = info.render.frame;

						}

					}

					if ( ! object.frustumCulled || _frustum.intersectsObject( object ) ) {

						if ( sortObjects ) {

							_vector3.setFromMatrixPosition( object.matrixWorld )
								.applyMatrix4( _projScreenMatrix );

						}

						var geometry = objects.update( object );
						var material = object.material;

						if ( Array.isArray( material ) ) {

							var groups = geometry.groups;

							for ( var i = 0, l = groups.length; i < l; i ++ ) {

								var group = groups[ i ];
								var groupMaterial = material[ group.materialIndex ];

								if ( groupMaterial && groupMaterial.visible ) {

									currentRenderList.push( object, geometry, groupMaterial, groupOrder, _vector3.z, group );

								}

							}

						} else if ( material.visible ) {

							currentRenderList.push( object, geometry, material, groupOrder, _vector3.z, null );

						}

					}

				}

			}

			var children = object.children;

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

				projectObject( children[ i ], camera, groupOrder, sortObjects );

			}

		}

		function renderObjects( renderList, scene, camera, overrideMaterial ) {

			for ( var i = 0, l = renderList.length; i < l; i ++ ) {

				var renderItem = renderList[ i ];

				var object = renderItem.object;
				var geometry = renderItem.geometry;
				var material = overrideMaterial === undefined ? renderItem.material : overrideMaterial;
				var group = renderItem.group;

				if ( camera.isArrayCamera ) {

					_currentArrayCamera = camera;

					if ( xr.enabled && multiview.isAvailable() ) {

						renderObject( object, scene, camera, geometry, material, group );

					} else {

						var cameras = camera.cameras;

						for ( var j = 0, jl = cameras.length; j < jl; j ++ ) {

							var camera2 = cameras[ j ];

							if ( object.layers.test( camera2.layers ) ) {

								state.viewport( _currentViewport.copy( camera2.viewport ) );

								currentRenderState.setupLights( camera2 );

								renderObject( object, scene, camera2, geometry, material, group );

							}

						}

					}

				} else {

					_currentArrayCamera = null;

					renderObject( object, scene, camera, geometry, material, group );

				}

			}

		}

		function renderObject( object, scene, camera, geometry, material, group ) {

			object.onBeforeRender( _this, scene, camera, geometry, material, group );
			currentRenderState = renderStates.get( scene, _currentArrayCamera || camera );

			object.modelViewMatrix.multiplyMatrices( camera.matrixWorldInverse, object.matrixWorld );
			object.normalMatrix.getNormalMatrix( object.modelViewMatrix );

			if ( object.isImmediateRenderObject ) {

				var program = setProgram( camera, scene, material, object );

				state.setMaterial( material );

				_currentGeometryProgram.geometry = null;
				_currentGeometryProgram.program = null;
				_currentGeometryProgram.wireframe = false;

				renderObjectImmediate( object, program );

			} else {

				_this.renderBufferDirect( camera, scene, geometry, material, object, group );

			}

			object.onAfterRender( _this, scene, camera, geometry, material, group );
			currentRenderState = renderStates.get( scene, _currentArrayCamera || camera );

		}

		function initMaterial( material, scene, object ) {

			var materialProperties = properties.get( material );

			var lights = currentRenderState.state.lights;
			var shadowsArray = currentRenderState.state.shadowsArray;

			var lightsStateVersion = lights.state.version;

			var parameters = programCache.getParameters( material, lights.state, shadowsArray, scene, _clipping.numPlanes, _clipping.numIntersection, object );
			var programCacheKey = programCache.getProgramCacheKey( parameters );

			var program = materialProperties.program;
			var programChange = true;

			if ( program === undefined ) {

				// new material
				material.addEventListener( 'dispose', onMaterialDispose );

			} else if ( program.cacheKey !== programCacheKey ) {

				// changed glsl or parameters
				releaseMaterialProgramReference( material );

			} else if ( materialProperties.lightsStateVersion !== lightsStateVersion ) {

				materialProperties.lightsStateVersion = lightsStateVersion;

				programChange = false;

			} else if ( parameters.shaderID !== undefined ) {

				// same glsl and uniform list
				return;

			} else {

				// only rebuild uniform list
				programChange = false;

			}

			if ( programChange ) {

				program = programCache.acquireProgram( parameters, programCacheKey );

				materialProperties.program = program;
				materialProperties.uniforms = parameters.uniforms;
				materialProperties.environment = material.isMeshStandardMaterial ? scene.environment : null;
				materialProperties.outputEncoding = _this.outputEncoding;
				material.program = program;

			}

			var programAttributes = program.getAttributes();

			if ( material.morphTargets ) {

				material.numSupportedMorphTargets = 0;

				for ( var i = 0; i < _this.maxMorphTargets; i ++ ) {

					if ( programAttributes[ 'morphTarget' + i ] >= 0 ) {

						material.numSupportedMorphTargets ++;

					}

				}

			}

			if ( material.morphNormals ) {

				material.numSupportedMorphNormals = 0;

				for ( var i = 0; i < _this.maxMorphNormals; i ++ ) {

					if ( programAttributes[ 'morphNormal' + i ] >= 0 ) {

						material.numSupportedMorphNormals ++;

					}

				}

			}

			var uniforms = materialProperties.uniforms;

			if ( ! material.isShaderMaterial &&
				! material.isRawShaderMaterial ||
				material.clipping === true ) {

				materialProperties.numClippingPlanes = _clipping.numPlanes;
				materialProperties.numIntersection = _clipping.numIntersection;
				uniforms.clippingPlanes = _clipping.uniform;

			}

			materialProperties.fog = scene.fog;

			// store the light setup it was created for

			materialProperties.needsLights = materialNeedsLights( material );
			materialProperties.lightsStateVersion = lightsStateVersion;

			if ( materialProperties.needsLights ) {

				// wire up the material to this renderer's lighting state

				uniforms.ambientLightColor.value = lights.state.ambient;
				uniforms.lightProbe.value = lights.state.probe;
				uniforms.directionalLights.value = lights.state.directional;
				uniforms.directionalLightShadows.value = lights.state.directionalShadow;
				uniforms.spotLights.value = lights.state.spot;
				uniforms.spotLightShadows.value = lights.state.spotShadow;
				uniforms.rectAreaLights.value = lights.state.rectArea;
				uniforms.pointLights.value = lights.state.point;
				uniforms.pointLightShadows.value = lights.state.pointShadow;
				uniforms.hemisphereLights.value = lights.state.hemi;

				uniforms.directionalShadowMap.value = lights.state.directionalShadowMap;
				uniforms.directionalShadowMatrix.value = lights.state.directionalShadowMatrix;
				uniforms.spotShadowMap.value = lights.state.spotShadowMap;
				uniforms.spotShadowMatrix.value = lights.state.spotShadowMatrix;
				uniforms.pointShadowMap.value = lights.state.pointShadowMap;
				uniforms.pointShadowMatrix.value = lights.state.pointShadowMatrix;
				// TODO (abelnation): add area lights shadow info to uniforms

			}

			var progUniforms = materialProperties.program.getUniforms(),
				uniformsList =
					WebGLUniforms.seqWithValue( progUniforms.seq, uniforms );

			materialProperties.uniformsList = uniformsList;

		}

		function setProgram( camera, scene, material, object ) {

			textures.resetTextureUnits();

			var fog = scene.fog;
			var environment = material.isMeshStandardMaterial ? scene.environment : null;

			var materialProperties = properties.get( material );
			var lights = currentRenderState.state.lights;

			if ( _clippingEnabled ) {

				if ( _localClippingEnabled || camera !== _currentCamera ) {

					var useCache =
						camera === _currentCamera &&
						material.id === _currentMaterialId;

					// we might want to call this function with some ClippingGroup
					// object instead of the material, once it becomes feasible
					// (#8465, #8379)
					_clipping.setState(
						material.clippingPlanes, material.clipIntersection, material.clipShadows,
						camera, materialProperties, useCache );

				}

			}

			if ( material.version === materialProperties.__version ) {

				if ( materialProperties.program === undefined ) {

					initMaterial( material, scene, object );

				} else if ( material.fog && materialProperties.fog !== fog ) {

					initMaterial( material, scene, object );

				} else if ( materialProperties.environment !== environment ) {

					initMaterial( material, scene, object );

				} else if ( materialProperties.needsLights && ( materialProperties.lightsStateVersion !== lights.state.version ) ) {

					initMaterial( material, scene, object );

				} else if ( materialProperties.numClippingPlanes !== undefined &&
					( materialProperties.numClippingPlanes !== _clipping.numPlanes ||
					materialProperties.numIntersection !== _clipping.numIntersection ) ) {

					initMaterial( material, scene, object );

				} else if ( materialProperties.outputEncoding !== _this.outputEncoding ) {

					initMaterial( material, scene, object );

				}

			} else {

				initMaterial( material, scene, object );
				materialProperties.__version = material.version;

			}

			var refreshProgram = false;
			var refreshMaterial = false;
			var refreshLights = false;

			var program = materialProperties.program,
				p_uniforms = program.getUniforms(),
				m_uniforms = materialProperties.uniforms;

			if ( state.useProgram( program.program ) ) {

				refreshProgram = true;
				refreshMaterial = true;
				refreshLights = true;

			}

			if ( material.id !== _currentMaterialId ) {

				_currentMaterialId = material.id;

				refreshMaterial = true;

			}

			if ( refreshProgram || _currentCamera !== camera ) {

				if ( program.numMultiviewViews > 0 ) {

					multiview.updateCameraProjectionMatricesUniform( camera, p_uniforms );

				} else {

					p_uniforms.setValue( _gl, 'projectionMatrix', camera.projectionMatrix );

				}

				if ( capabilities.logarithmicDepthBuffer ) {

					p_uniforms.setValue( _gl, 'logDepthBufFC',
						2.0 / ( Math.log( camera.far + 1.0 ) / Math.LN2 ) );

				}

				if ( _currentCamera !== camera ) {

					_currentCamera = camera;

					// lighting uniforms depend on the camera so enforce an update
					// now, in case this material supports lights - or later, when
					// the next material that does gets activated:

					refreshMaterial = true;		// set to true on material change
					refreshLights = true;		// remains set until update done

				}

				// load material specific uniforms
				// (shader material also gets them for the sake of genericity)

				if ( material.isShaderMaterial ||
					material.isMeshPhongMaterial ||
					material.isMeshToonMaterial ||
					material.isMeshStandardMaterial ||
					material.envMap ) {

					var uCamPos = p_uniforms.map.cameraPosition;

					if ( uCamPos !== undefined ) {

						uCamPos.setValue( _gl,
							_vector3.setFromMatrixPosition( camera.matrixWorld ) );

					}

				}

				if ( material.isMeshPhongMaterial ||
					material.isMeshToonMaterial ||
					material.isMeshLambertMaterial ||
					material.isMeshBasicMaterial ||
					material.isMeshStandardMaterial ||
					material.isShaderMaterial ) {

					p_uniforms.setValue( _gl, 'isOrthographic', camera.isOrthographicCamera === true );

				}

				if ( material.isMeshPhongMaterial ||
					material.isMeshToonMaterial ||
					material.isMeshLambertMaterial ||
					material.isMeshBasicMaterial ||
					material.isMeshStandardMaterial ||
					material.isShaderMaterial ||
					material.skinning ) {

					if ( program.numMultiviewViews > 0 ) {

						multiview.updateCameraViewMatricesUniform( camera, p_uniforms );

					} else {

						p_uniforms.setValue( _gl, 'viewMatrix', camera.matrixWorldInverse );

					}

				}

			}

			// skinning uniforms must be set even if material didn't change
			// auto-setting of texture unit for bone texture must go before other textures
			// not sure why, but otherwise weird things happen

			if ( material.skinning ) {

				p_uniforms.setOptional( _gl, object, 'bindMatrix' );
				p_uniforms.setOptional( _gl, object, 'bindMatrixInverse' );

				var skeleton = object.skeleton;

				if ( skeleton ) {

					var bones = skeleton.bones;

					if ( capabilities.floatVertexTextures ) {

						if ( skeleton.boneTexture === undefined ) {

							// 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)


							var size = Math.sqrt( bones.length * 4 ); // 4 pixels needed for 1 matrix
							size = MathUtils.ceilPowerOfTwo( size );
							size = Math.max( size, 4 );

							var boneMatrices = new Float32Array( size * size * 4 ); // 4 floats per RGBA pixel
							boneMatrices.set( skeleton.boneMatrices ); // copy current values

							var boneTexture = new DataTexture( boneMatrices, size, size, RGBAFormat, FloatType );

							skeleton.boneMatrices = boneMatrices;
							skeleton.boneTexture = boneTexture;
							skeleton.boneTextureSize = size;

						}

						p_uniforms.setValue( _gl, 'boneTexture', skeleton.boneTexture, textures );
						p_uniforms.setValue( _gl, 'boneTextureSize', skeleton.boneTextureSize );

					} else {

						p_uniforms.setOptional( _gl, skeleton, 'boneMatrices' );

					}

				}

			}

			if ( refreshMaterial || materialProperties.receiveShadow !== object.receiveShadow ) {

				materialProperties.receiveShadow = object.receiveShadow;
				p_uniforms.setValue( _gl, 'receiveShadow', object.receiveShadow );

			}

			if ( refreshMaterial ) {

				p_uniforms.setValue( _gl, 'toneMappingExposure', _this.toneMappingExposure );
				p_uniforms.setValue( _gl, 'toneMappingWhitePoint', _this.toneMappingWhitePoint );

				if ( materialProperties.needsLights ) {

					// the current material requires lighting info

					// note: all lighting uniforms are always set correctly
					// they simply reference the renderer's state for their
					// values
					//
					// use the current material's .needsUpdate flags to set
					// the GL state when required

					markUniformsLightsNeedsUpdate( m_uniforms, refreshLights );

				}

				// refresh uniforms common to several materials

				if ( fog && material.fog ) {

					refreshUniformsFog( m_uniforms, fog );

				}

				if ( material.isMeshBasicMaterial ) {

					refreshUniformsCommon( m_uniforms, material );

				} else if ( material.isMeshLambertMaterial ) {

					refreshUniformsCommon( m_uniforms, material );
					refreshUniformsLambert( m_uniforms, material );

				} else if ( material.isMeshToonMaterial ) {

					refreshUniformsCommon( m_uniforms, material );
					refreshUniformsToon( m_uniforms, material );

				} else if ( material.isMeshPhongMaterial ) {

					refreshUniformsCommon( m_uniforms, material );
					refreshUniformsPhong( m_uniforms, material );

				} else if ( material.isMeshStandardMaterial ) {

					refreshUniformsCommon( m_uniforms, material, environment );

					if ( material.isMeshPhysicalMaterial ) {

						refreshUniformsPhysical( m_uniforms, material, environment );

					} else {

						refreshUniformsStandard( m_uniforms, material, environment );

					}

				} else if ( material.isMeshMatcapMaterial ) {

					refreshUniformsCommon( m_uniforms, material );
					refreshUniformsMatcap( m_uniforms, material );

				} else if ( material.isMeshDepthMaterial ) {

					refreshUniformsCommon( m_uniforms, material );
					refreshUniformsDepth( m_uniforms, material );

				} else if ( material.isMeshDistanceMaterial ) {

					refreshUniformsCommon( m_uniforms, material );
					refreshUniformsDistance( m_uniforms, material );

				} else if ( material.isMeshNormalMaterial ) {

					refreshUniformsCommon( m_uniforms, material );
					refreshUniformsNormal( m_uniforms, material );

				} else if ( material.isLineBasicMaterial ) {

					refreshUniformsLine( m_uniforms, material );

					if ( material.isLineDashedMaterial ) {

						refreshUniformsDash( m_uniforms, material );

					}

				} else if ( material.isPointsMaterial ) {

					refreshUniformsPoints( m_uniforms, material );

				} else if ( material.isSpriteMaterial ) {

					refreshUniformsSprites( m_uniforms, material );

				} else if ( material.isShadowMaterial ) {

					m_uniforms.color.value.copy( material.color );
					m_uniforms.opacity.value = material.opacity;

				}

				// RectAreaLight Texture
				// TODO (mrdoob): Find a nicer implementation

				if ( m_uniforms.ltc_1 !== undefined ) { m_uniforms.ltc_1.value = UniformsLib.LTC_1; }
				if ( m_uniforms.ltc_2 !== undefined ) { m_uniforms.ltc_2.value = UniformsLib.LTC_2; }

				WebGLUniforms.upload( _gl, materialProperties.uniformsList, m_uniforms, textures );

				if ( material.isShaderMaterial ) {

					material.uniformsNeedUpdate = false; // #15581

				}

			}

			if ( material.isShaderMaterial && material.uniformsNeedUpdate === true ) {

				WebGLUniforms.upload( _gl, materialProperties.uniformsList, m_uniforms, textures );
				material.uniformsNeedUpdate = false;

			}

			if ( material.isSpriteMaterial ) {

				p_uniforms.setValue( _gl, 'center', object.center );

			}

			// common matrices

			if ( program.numMultiviewViews > 0 ) {

				multiview.updateObjectMatricesUniforms( object, camera, p_uniforms );

			} else {

				p_uniforms.setValue( _gl, 'modelViewMatrix', object.modelViewMatrix );
				p_uniforms.setValue( _gl, 'normalMatrix', object.normalMatrix );

			}

			p_uniforms.setValue( _gl, 'modelMatrix', object.matrixWorld );

			return program;

		}

		// Uniforms (refresh uniforms objects)

		function refreshUniformsCommon( uniforms, material, environment ) {

			uniforms.opacity.value = material.opacity;

			if ( material.color ) {

				uniforms.diffuse.value.copy( material.color );

			}

			if ( material.emissive ) {

				uniforms.emissive.value.copy( material.emissive ).multiplyScalar( material.emissiveIntensity );

			}

			if ( material.map ) {

				uniforms.map.value = material.map;

			}

			if ( material.alphaMap ) {

				uniforms.alphaMap.value = material.alphaMap;

			}

			if ( material.specularMap ) {

				uniforms.specularMap.value = material.specularMap;

			}

			var envMap = material.envMap || environment;

			if ( envMap ) {

				uniforms.envMap.value = envMap;

				uniforms.flipEnvMap.value = envMap.isCubeTexture ? - 1 : 1;

				uniforms.reflectivity.value = material.reflectivity;
				uniforms.refractionRatio.value = material.refractionRatio;

				uniforms.maxMipLevel.value = properties.get( envMap ).__maxMipLevel;

			}

			if ( material.lightMap ) {

				uniforms.lightMap.value = material.lightMap;
				uniforms.lightMapIntensity.value = material.lightMapIntensity;

			}

			if ( material.aoMap ) {

				uniforms.aoMap.value = material.aoMap;
				uniforms.aoMapIntensity.value = material.aoMapIntensity;

			}

			// uv repeat and offset setting priorities
			// 1. color map
			// 2. specular map
			// 3. normal map
			// 4. bump map
			// 5. alpha map
			// 6. emissive map

			var uvScaleMap;

			if ( material.map ) {

				uvScaleMap = material.map;

			} else if ( material.specularMap ) {

				uvScaleMap = material.specularMap;

			} else if ( material.displacementMap ) {

				uvScaleMap = material.displacementMap;

			} else if ( material.normalMap ) {

				uvScaleMap = material.normalMap;

			} else if ( material.bumpMap ) {

				uvScaleMap = material.bumpMap;

			} else if ( material.roughnessMap ) {

				uvScaleMap = material.roughnessMap;

			} else if ( material.metalnessMap ) {

				uvScaleMap = material.metalnessMap;

			} else if ( material.alphaMap ) {

				uvScaleMap = material.alphaMap;

			} else if ( material.emissiveMap ) {

				uvScaleMap = material.emissiveMap;

			}

			if ( uvScaleMap !== undefined ) {

				// backwards compatibility
				if ( uvScaleMap.isWebGLRenderTarget ) {

					uvScaleMap = uvScaleMap.texture;

				}

				if ( uvScaleMap.matrixAutoUpdate === true ) {

					uvScaleMap.updateMatrix();

				}

				uniforms.uvTransform.value.copy( uvScaleMap.matrix );

			}

			// uv repeat and offset setting priorities for uv2
			// 1. ao map
			// 2. light map

			var uv2ScaleMap;

			if ( material.aoMap ) {

				uv2ScaleMap = material.aoMap;

			} else if ( material.lightMap ) {

				uv2ScaleMap = material.lightMap;

			}

			if ( uv2ScaleMap !== undefined ) {

				// backwards compatibility
				if ( uv2ScaleMap.isWebGLRenderTarget ) {

					uv2ScaleMap = uv2ScaleMap.texture;

				}

				if ( uv2ScaleMap.matrixAutoUpdate === true ) {

					uv2ScaleMap.updateMatrix();

				}

				uniforms.uv2Transform.value.copy( uv2ScaleMap.matrix );

			}

		}

		function refreshUniformsLine( uniforms, material ) {

			uniforms.diffuse.value.copy( material.color );
			uniforms.opacity.value = material.opacity;

		}

		function refreshUniformsDash( uniforms, material ) {

			uniforms.dashSize.value = material.dashSize;
			uniforms.totalSize.value = material.dashSize + material.gapSize;
			uniforms.scale.value = material.scale;

		}

		function refreshUniformsPoints( uniforms, material ) {

			uniforms.diffuse.value.copy( material.color );
			uniforms.opacity.value = material.opacity;
			uniforms.size.value = material.size * _pixelRatio;
			uniforms.scale.value = _height * 0.5;

			if ( material.map ) {

				uniforms.map.value = material.map;

			}

			if ( material.alphaMap ) {

				uniforms.alphaMap.value = material.alphaMap;

			}

			// uv repeat and offset setting priorities
			// 1. color map
			// 2. alpha map

			var uvScaleMap;

			if ( material.map ) {

				uvScaleMap = material.map;

			} else if ( material.alphaMap ) {

				uvScaleMap = material.alphaMap;

			}

			if ( uvScaleMap !== undefined ) {

				if ( uvScaleMap.matrixAutoUpdate === true ) {

					uvScaleMap.updateMatrix();

				}

				uniforms.uvTransform.value.copy( uvScaleMap.matrix );

			}

		}

		function refreshUniformsSprites( uniforms, material ) {

			uniforms.diffuse.value.copy( material.color );
			uniforms.opacity.value = material.opacity;
			uniforms.rotation.value = material.rotation;

			if ( material.map ) {

				uniforms.map.value = material.map;

			}

			if ( material.alphaMap ) {

				uniforms.alphaMap.value = material.alphaMap;

			}

			// uv repeat and offset setting priorities
			// 1. color map
			// 2. alpha map

			var uvScaleMap;

			if ( material.map ) {

				uvScaleMap = material.map;

			} else if ( material.alphaMap ) {

				uvScaleMap = material.alphaMap;

			}

			if ( uvScaleMap !== undefined ) {

				if ( uvScaleMap.matrixAutoUpdate === true ) {

					uvScaleMap.updateMatrix();

				}

				uniforms.uvTransform.value.copy( uvScaleMap.matrix );

			}

		}

		function refreshUniformsFog( uniforms, fog ) {

			uniforms.fogColor.value.copy( fog.color );

			if ( fog.isFog ) {

				uniforms.fogNear.value = fog.near;
				uniforms.fogFar.value = fog.far;

			} else if ( fog.isFogExp2 ) {

				uniforms.fogDensity.value = fog.density;

			}

		}

		function refreshUniformsLambert( uniforms, material ) {

			if ( material.emissiveMap ) {

				uniforms.emissiveMap.value = material.emissiveMap;

			}

		}

		function refreshUniformsPhong( uniforms, material ) {

			uniforms.specular.value.copy( material.specular );
			uniforms.shininess.value = Math.max( material.shininess, 1e-4 ); // to prevent pow( 0.0, 0.0 )

			if ( material.emissiveMap ) {

				uniforms.emissiveMap.value = material.emissiveMap;

			}

			if ( material.bumpMap ) {

				uniforms.bumpMap.value = material.bumpMap;
				uniforms.bumpScale.value = material.bumpScale;
				if ( material.side === BackSide ) { uniforms.bumpScale.value *= - 1; }

			}

			if ( material.normalMap ) {

				uniforms.normalMap.value = material.normalMap;
				uniforms.normalScale.value.copy( material.normalScale );
				if ( material.side === BackSide ) { uniforms.normalScale.value.negate(); }

			}

			if ( material.displacementMap ) {

				uniforms.displacementMap.value = material.displacementMap;
				uniforms.displacementScale.value = material.displacementScale;
				uniforms.displacementBias.value = material.displacementBias;

			}

		}

		function refreshUniformsToon( uniforms, material ) {

			uniforms.specular.value.copy( material.specular );
			uniforms.shininess.value = Math.max( material.shininess, 1e-4 ); // to prevent pow( 0.0, 0.0 )

			if ( material.gradientMap ) {

				uniforms.gradientMap.value = material.gradientMap;

			}

			if ( material.emissiveMap ) {

				uniforms.emissiveMap.value = material.emissiveMap;

			}

			if ( material.bumpMap ) {

				uniforms.bumpMap.value = material.bumpMap;
				uniforms.bumpScale.value = material.bumpScale;
				if ( material.side === BackSide ) { uniforms.bumpScale.value *= - 1; }

			}

			if ( material.normalMap ) {

				uniforms.normalMap.value = material.normalMap;
				uniforms.normalScale.value.copy( material.normalScale );
				if ( material.side === BackSide ) { uniforms.normalScale.value.negate(); }

			}

			if ( material.displacementMap ) {

				uniforms.displacementMap.value = material.displacementMap;
				uniforms.displacementScale.value = material.displacementScale;
				uniforms.displacementBias.value = material.displacementBias;

			}

		}

		function refreshUniformsStandard( uniforms, material, environment ) {

			uniforms.roughness.value = material.roughness;
			uniforms.metalness.value = material.metalness;

			if ( material.roughnessMap ) {

				uniforms.roughnessMap.value = material.roughnessMap;

			}

			if ( material.metalnessMap ) {

				uniforms.metalnessMap.value = material.metalnessMap;

			}

			if ( material.emissiveMap ) {

				uniforms.emissiveMap.value = material.emissiveMap;

			}

			if ( material.bumpMap ) {

				uniforms.bumpMap.value = material.bumpMap;
				uniforms.bumpScale.value = material.bumpScale;
				if ( material.side === BackSide ) { uniforms.bumpScale.value *= - 1; }

			}

			if ( material.normalMap ) {

				uniforms.normalMap.value = material.normalMap;
				uniforms.normalScale.value.copy( material.normalScale );
				if ( material.side === BackSide ) { uniforms.normalScale.value.negate(); }

			}

			if ( material.displacementMap ) {

				uniforms.displacementMap.value = material.displacementMap;
				uniforms.displacementScale.value = material.displacementScale;
				uniforms.displacementBias.value = material.displacementBias;

			}

			if ( material.envMap || environment ) {

				//uniforms.envMap.value = material.envMap; // part of uniforms common
				uniforms.envMapIntensity.value = material.envMapIntensity;

			}

		}

		function refreshUniformsPhysical( uniforms, material, environment ) {

			refreshUniformsStandard( uniforms, material, environment );

			uniforms.reflectivity.value = material.reflectivity; // also part of uniforms common

			uniforms.clearcoat.value = material.clearcoat;
			uniforms.clearcoatRoughness.value = material.clearcoatRoughness;
			if ( material.sheen ) { uniforms.sheen.value.copy( material.sheen ); }

			if ( material.clearcoatNormalMap ) {

				uniforms.clearcoatNormalScale.value.copy( material.clearcoatNormalScale );
				uniforms.clearcoatNormalMap.value = material.clearcoatNormalMap;

				if ( material.side === BackSide ) {

					uniforms.clearcoatNormalScale.value.negate();

				}

			}

			uniforms.transparency.value = material.transparency;

		}

		function refreshUniformsMatcap( uniforms, material ) {

			if ( material.matcap ) {

				uniforms.matcap.value = material.matcap;

			}

			if ( material.bumpMap ) {

				uniforms.bumpMap.value = material.bumpMap;
				uniforms.bumpScale.value = material.bumpScale;
				if ( material.side === BackSide ) { uniforms.bumpScale.value *= - 1; }

			}

			if ( material.normalMap ) {

				uniforms.normalMap.value = material.normalMap;
				uniforms.normalScale.value.copy( material.normalScale );
				if ( material.side === BackSide ) { uniforms.normalScale.value.negate(); }

			}

			if ( material.displacementMap ) {

				uniforms.displacementMap.value = material.displacementMap;
				uniforms.displacementScale.value = material.displacementScale;
				uniforms.displacementBias.value = material.displacementBias;

			}

		}

		function refreshUniformsDepth( uniforms, material ) {

			if ( material.displacementMap ) {

				uniforms.displacementMap.value = material.displacementMap;
				uniforms.displacementScale.value = material.displacementScale;
				uniforms.displacementBias.value = material.displacementBias;

			}

		}

		function refreshUniformsDistance( uniforms, material ) {

			if ( material.displacementMap ) {

				uniforms.displacementMap.value = material.displacementMap;
				uniforms.displacementScale.value = material.displacementScale;
				uniforms.displacementBias.value = material.displacementBias;

			}

			uniforms.referencePosition.value.copy( material.referencePosition );
			uniforms.nearDistance.value = material.nearDistance;
			uniforms.farDistance.value = material.farDistance;

		}

		function refreshUniformsNormal( uniforms, material ) {

			if ( material.bumpMap ) {

				uniforms.bumpMap.value = material.bumpMap;
				uniforms.bumpScale.value = material.bumpScale;
				if ( material.side === BackSide ) { uniforms.bumpScale.value *= - 1; }

			}

			if ( material.normalMap ) {

				uniforms.normalMap.value = material.normalMap;
				uniforms.normalScale.value.copy( material.normalScale );
				if ( material.side === BackSide ) { uniforms.normalScale.value.negate(); }

			}

			if ( material.displacementMap ) {

				uniforms.displacementMap.value = material.displacementMap;
				uniforms.displacementScale.value = material.displacementScale;
				uniforms.displacementBias.value = material.displacementBias;

			}

		}

		// If uniforms are marked as clean, they don't need to be loaded to the GPU.

		function markUniformsLightsNeedsUpdate( uniforms, value ) {

			uniforms.ambientLightColor.needsUpdate = value;
			uniforms.lightProbe.needsUpdate = value;

			uniforms.directionalLights.needsUpdate = value;
			uniforms.directionalLightShadows.needsUpdate = value;
			uniforms.pointLights.needsUpdate = value;
			uniforms.pointLightShadows.needsUpdate = value;
			uniforms.spotLights.needsUpdate = value;
			uniforms.spotLightShadows.needsUpdate = value;
			uniforms.rectAreaLights.needsUpdate = value;
			uniforms.hemisphereLights.needsUpdate = value;

		}

		function materialNeedsLights( material ) {

			return material.isMeshLambertMaterial || material.isMeshToonMaterial || material.isMeshPhongMaterial ||
				material.isMeshStandardMaterial || material.isShadowMaterial ||
				( material.isShaderMaterial && material.lights === true );

		}

		//
		this.setFramebuffer = function ( value ) {

			if ( _framebuffer !== value && _currentRenderTarget === null ) { _gl.bindFramebuffer( 36160, value ); }

			_framebuffer = value;

		};

		this.getActiveCubeFace = function () {

			return _currentActiveCubeFace;

		};

		this.getActiveMipmapLevel = function () {

			return _currentActiveMipmapLevel;

		};

		this.getRenderTarget = function () {

			return _currentRenderTarget;

		};

		this.setRenderTarget = function ( renderTarget, activeCubeFace, activeMipmapLevel ) {

			_currentRenderTarget = renderTarget;
			_currentActiveCubeFace = activeCubeFace;
			_currentActiveMipmapLevel = activeMipmapLevel;

			if ( renderTarget && properties.get( renderTarget ).__webglFramebuffer === undefined ) {

				textures.setupRenderTarget( renderTarget );

			}

			var framebuffer = _framebuffer;
			var isCube = false;

			if ( renderTarget ) {

				var __webglFramebuffer = properties.get( renderTarget ).__webglFramebuffer;

				if ( renderTarget.isWebGLCubeRenderTarget ) {

					framebuffer = __webglFramebuffer[ activeCubeFace || 0 ];
					isCube = true;

				} else if ( renderTarget.isWebGLMultisampleRenderTarget ) {

					framebuffer = properties.get( renderTarget ).__webglMultisampledFramebuffer;

				} else {

					framebuffer = __webglFramebuffer;

				}

				_currentViewport.copy( renderTarget.viewport );
				_currentScissor.copy( renderTarget.scissor );
				_currentScissorTest = renderTarget.scissorTest;

			} else {

				_currentViewport.copy( _viewport ).multiplyScalar( _pixelRatio ).floor();
				_currentScissor.copy( _scissor ).multiplyScalar( _pixelRatio ).floor();
				_currentScissorTest = _scissorTest;

			}

			if ( _currentFramebuffer !== framebuffer ) {

				_gl.bindFramebuffer( 36160, framebuffer );
				_currentFramebuffer = framebuffer;

			}

			state.viewport( _currentViewport );
			state.scissor( _currentScissor );
			state.setScissorTest( _currentScissorTest );

			if ( isCube ) {

				var textureProperties = properties.get( renderTarget.texture );
				_gl.framebufferTexture2D( 36160, 36064, 34069 + ( activeCubeFace || 0 ), textureProperties.__webglTexture, activeMipmapLevel || 0 );

			}

		};

		this.readRenderTargetPixels = function ( renderTarget, x, y, width, height, buffer, activeCubeFaceIndex ) {

			if ( ! ( renderTarget && renderTarget.isWebGLRenderTarget ) ) {

				console.error( 'THREE.WebGLRenderer.readRenderTargetPixels: renderTarget is not THREE.WebGLRenderTarget.' );
				return;

			}

			var framebuffer = properties.get( renderTarget ).__webglFramebuffer;

			if ( renderTarget.isWebGLCubeRenderTarget && activeCubeFaceIndex !== undefined ) {

				framebuffer = framebuffer[ activeCubeFaceIndex ];

			}

			if ( framebuffer ) {

				var restore = false;

				if ( framebuffer !== _currentFramebuffer ) {

					_gl.bindFramebuffer( 36160, framebuffer );

					restore = true;

				}

				try {

					var texture = renderTarget.texture;
					var textureFormat = texture.format;
					var textureType = texture.type;

					if ( textureFormat !== RGBAFormat && utils.convert( textureFormat ) !== _gl.getParameter( 35739 ) ) {

						console.error( 'THREE.WebGLRenderer.readRenderTargetPixels: renderTarget is not in RGBA or implementation defined format.' );
						return;

					}

					if ( textureType !== UnsignedByteType && utils.convert( textureType ) !== _gl.getParameter( 35738 ) && // IE11, Edge and Chrome Mac < 52 (#9513)
						! ( textureType === FloatType && ( capabilities.isWebGL2 || extensions.get( 'OES_texture_float' ) || extensions.get( 'WEBGL_color_buffer_float' ) ) ) && // Chrome Mac >= 52 and Firefox
						! ( textureType === HalfFloatType && ( capabilities.isWebGL2 ? extensions.get( 'EXT_color_buffer_float' ) : extensions.get( 'EXT_color_buffer_half_float' ) ) ) ) {

						console.error( 'THREE.WebGLRenderer.readRenderTargetPixels: renderTarget is not in UnsignedByteType or implementation defined type.' );
						return;

					}

					if ( _gl.checkFramebufferStatus( 36160 ) === 36053 ) {

						// the following if statement ensures valid read requests (no out-of-bounds pixels, see #8604)

						if ( ( x >= 0 && x <= ( renderTarget.width - width ) ) && ( y >= 0 && y <= ( renderTarget.height - height ) ) ) {

							_gl.readPixels( x, y, width, height, utils.convert( textureFormat ), utils.convert( textureType ), buffer );

						}

					} else {

						console.error( 'THREE.WebGLRenderer.readRenderTargetPixels: readPixels from renderTarget failed. Framebuffer not complete.' );

					}

				} finally {

					if ( restore ) {

						_gl.bindFramebuffer( 36160, _currentFramebuffer );

					}

				}

			}

		};

		this.copyFramebufferToTexture = function ( position, texture, level ) {

			if ( level === undefined ) { level = 0; }

			var levelScale = Math.pow( 2, - level );
			var width = Math.floor( texture.image.width * levelScale );
			var height = Math.floor( texture.image.height * levelScale );
			var glFormat = utils.convert( texture.format );

			textures.setTexture2D( texture, 0 );

			_gl.copyTexImage2D( 3553, level, glFormat, position.x, position.y, width, height, 0 );

			state.unbindTexture();

		};

		this.copyTextureToTexture = function ( position, srcTexture, dstTexture, level ) {

			var width = srcTexture.image.width;
			var height = srcTexture.image.height;
			var glFormat = utils.convert( dstTexture.format );
			var glType = utils.convert( dstTexture.type );

			textures.setTexture2D( dstTexture, 0 );

			if ( srcTexture.isDataTexture ) {

				_gl.texSubImage2D( 3553, level || 0, position.x, position.y, width, height, glFormat, glType, srcTexture.image.data );

			} else {

				_gl.texSubImage2D( 3553, level || 0, position.x, position.y, glFormat, glType, srcTexture.image );

			}

			state.unbindTexture();

		};

		this.initTexture = function ( texture ) {

			textures.setTexture2D( texture, 0 );

			state.unbindTexture();

		};

		if ( typeof __THREE_DEVTOOLS__ !== 'undefined' ) {

			__THREE_DEVTOOLS__.dispatchEvent( new CustomEvent( 'observe', { detail: this } ) ); // eslint-disable-line no-undef

		}

	}

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author alteredq / http://alteredqualia.com/
	 */

	function FogExp2( color, density ) {

		this.name = '';

		this.color = new Color( color );
		this.density = ( density !== undefined ) ? density : 0.00025;

	}

	Object.assign( FogExp2.prototype, {

		isFogExp2: true,

		clone: function () {

			return new FogExp2( this.color, this.density );

		},

		toJSON: function ( /* meta */ ) {

			return {
				type: 'FogExp2',
				color: this.color.getHex(),
				density: this.density
			};

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author alteredq / http://alteredqualia.com/
	 */

	function Fog( color, near, far ) {

		this.name = '';

		this.color = new Color( color );

		this.near = ( near !== undefined ) ? near : 1;
		this.far = ( far !== undefined ) ? far : 1000;

	}

	Object.assign( Fog.prototype, {

		isFog: true,

		clone: function () {

			return new Fog( this.color, this.near, this.far );

		},

		toJSON: function ( /* meta */ ) {

			return {
				type: 'Fog',
				color: this.color.getHex(),
				near: this.near,
				far: this.far
			};

		}

	} );

	/**
	 * @author benaadams / https://twitter.com/ben_a_adams
	 */

	function InterleavedBuffer( array, stride ) {

		this.array = array;
		this.stride = stride;
		this.count = array !== undefined ? array.length / stride : 0;

		this.usage = StaticDrawUsage;
		this.updateRange = { offset: 0, count: - 1 };

		this.version = 0;

	}

	Object.defineProperty( InterleavedBuffer.prototype, 'needsUpdate', {

		set: function ( value ) {

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

		}

	} );

	Object.assign( InterleavedBuffer.prototype, {

		isInterleavedBuffer: true,

		onUploadCallback: function () {},

		setUsage: function ( value ) {

			this.usage = value;

			return this;

		},

		copy: function ( source ) {

			this.array = new source.array.constructor( source.array );
			this.count = source.count;
			this.stride = source.stride;
			this.usage = source.usage;

			return this;

		},

		copyAt: function ( index1, attribute, index2 ) {

			index1 *= this.stride;
			index2 *= attribute.stride;

			for ( var i = 0, l = this.stride; i < l; i ++ ) {

				this.array[ index1 + i ] = attribute.array[ index2 + i ];

			}

			return this;

		},

		set: function ( value, offset ) {

			if ( offset === undefined ) { offset = 0; }

			this.array.set( value, offset );

			return this;

		},

		clone: function () {

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

		},

		onUpload: function ( callback ) {

			this.onUploadCallback = callback;

			return this;

		}

	} );

	/**
	 * @author benaadams / https://twitter.com/ben_a_adams
	 */

	var _vector$6 = new Vector3();

	function InterleavedBufferAttribute( interleavedBuffer, itemSize, offset, normalized ) {

		this.data = interleavedBuffer;
		this.itemSize = itemSize;
		this.offset = offset;

		this.normalized = normalized === true;

	}

	Object.defineProperties( InterleavedBufferAttribute.prototype, {

		count: {

			get: function () {

				return this.data.count;

			}

		},

		array: {

			get: function () {

				return this.data.array;

			}

		}

	} );

	Object.assign( InterleavedBufferAttribute.prototype, {

		isInterleavedBufferAttribute: true,

		applyMatrix4: function ( m ) {

			for ( var i = 0, l = this.data.count; i < l; i ++ ) {

				_vector$6.x = this.getX( i );
				_vector$6.y = this.getY( i );
				_vector$6.z = this.getZ( i );

				_vector$6.applyMatrix4( m );

				this.setXYZ( i, _vector$6.x, _vector$6.y, _vector$6.z );

			}

			return this;

		},

		setX: function ( index, x ) {

			this.data.array[ index * this.data.stride + this.offset ] = x;

			return this;

		},

		setY: function ( index, y ) {

			this.data.array[ index * this.data.stride + this.offset + 1 ] = y;

			return this;

		},

		setZ: function ( index, z ) {

			this.data.array[ index * this.data.stride + this.offset + 2 ] = z;

			return this;

		},

		setW: function ( index, w ) {

			this.data.array[ index * this.data.stride + this.offset + 3 ] = w;

			return this;

		},

		getX: function ( index ) {

			return this.data.array[ index * this.data.stride + this.offset ];

		},

		getY: function ( index ) {

			return this.data.array[ index * this.data.stride + this.offset + 1 ];

		},

		getZ: function ( index ) {

			return this.data.array[ index * this.data.stride + this.offset + 2 ];

		},

		getW: function ( index ) {

			return this.data.array[ index * this.data.stride + this.offset + 3 ];

		},

		setXY: function ( index, x, y ) {

			index = index * this.data.stride + this.offset;

			this.data.array[ index + 0 ] = x;
			this.data.array[ index + 1 ] = y;

			return this;

		},

		setXYZ: function ( index, x, y, z ) {

			index = index * this.data.stride + this.offset;

			this.data.array[ index + 0 ] = x;
			this.data.array[ index + 1 ] = y;
			this.data.array[ index + 2 ] = z;

			return this;

		},

		setXYZW: function ( index, x, y, z, w ) {

			index = index * this.data.stride + this.offset;

			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;

		}

	} );

	/**
	 * @author alteredq / http://alteredqualia.com/
	 *
	 * parameters = {
	 *  color: <hex>,
	 *  map: new THREE.Texture( <Image> ),
	 *  alphaMap: new THREE.Texture( <Image> ),
	 *  rotation: <float>,
	 *  sizeAttenuation: <bool>
	 * }
	 */

	function SpriteMaterial( parameters ) {

		Material.call( this );

		this.type = 'SpriteMaterial';

		this.color = new Color( 0xffffff );

		this.map = null;

		this.alphaMap = null;

		this.rotation = 0;

		this.sizeAttenuation = true;

		this.transparent = true;

		this.setValues( parameters );

	}

	SpriteMaterial.prototype = Object.create( Material.prototype );
	SpriteMaterial.prototype.constructor = SpriteMaterial;
	SpriteMaterial.prototype.isSpriteMaterial = true;

	SpriteMaterial.prototype.copy = function ( source ) {

		Material.prototype.copy.call( this, source );

		this.color.copy( source.color );

		this.map = source.map;

		this.alphaMap = source.alphaMap;

		this.rotation = source.rotation;

		this.sizeAttenuation = source.sizeAttenuation;

		return this;

	};

	/**
	 * @author mikael emtinger / http://gomo.se/
	 * @author alteredq / http://alteredqualia.com/
	 */

	var _geometry;

	var _intersectPoint = new Vector3();
	var _worldScale = new Vector3();
	var _mvPosition = new Vector3();

	var _alignedPosition = new Vector2();
	var _rotatedPosition = new Vector2();
	var _viewWorldMatrix = new Matrix4();

	var _vA$1 = new Vector3();
	var _vB$1 = new Vector3();
	var _vC$1 = new Vector3();

	var _uvA$1 = new Vector2();
	var _uvB$1 = new Vector2();
	var _uvC$1 = new Vector2();

	function Sprite( material ) {

		Object3D.call( this );

		this.type = 'Sprite';

		if ( _geometry === undefined ) {

			_geometry = new BufferGeometry();

			var 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
			] );

			var interleavedBuffer = new InterleavedBuffer( float32Array, 5 );

			_geometry.setIndex( [ 0, 1, 2,	0, 2, 3 ] );
			_geometry.setAttribute( 'position', new InterleavedBufferAttribute( interleavedBuffer, 3, 0, false ) );
			_geometry.setAttribute( 'uv', new InterleavedBufferAttribute( interleavedBuffer, 2, 3, false ) );

		}

		this.geometry = _geometry;
		this.material = ( material !== undefined ) ? material : new SpriteMaterial();

		this.center = new Vector2( 0.5, 0.5 );

	}

	Sprite.prototype = Object.assign( Object.create( Object3D.prototype ), {

		constructor: Sprite,

		isSprite: true,

		raycast: function ( 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 );

			}

			var rotation = this.material.rotation;
			var sin, cos;
			if ( rotation !== 0 ) {

				cos = Math.cos( rotation );
				sin = Math.sin( rotation );

			}

			var center = this.center;

			transformVertex( _vA$1.set( - 0.5, - 0.5, 0 ), _mvPosition, center, _worldScale, sin, cos );
			transformVertex( _vB$1.set( 0.5, - 0.5, 0 ), _mvPosition, center, _worldScale, sin, cos );
			transformVertex( _vC$1.set( 0.5, 0.5, 0 ), _mvPosition, center, _worldScale, sin, cos );

			_uvA$1.set( 0, 0 );
			_uvB$1.set( 1, 0 );
			_uvC$1.set( 1, 1 );

			// check first triangle
			var intersect = raycaster.ray.intersectTriangle( _vA$1, _vB$1, _vC$1, false, _intersectPoint );

			if ( intersect === null ) {

				// check second triangle
				transformVertex( _vB$1.set( - 0.5, 0.5, 0 ), _mvPosition, center, _worldScale, sin, cos );
				_uvB$1.set( 0, 1 );

				intersect = raycaster.ray.intersectTriangle( _vA$1, _vC$1, _vB$1, false, _intersectPoint );
				if ( intersect === null ) {

					return;

				}

			}

			var distance = raycaster.ray.origin.distanceTo( _intersectPoint );

			if ( distance < raycaster.near || distance > raycaster.far ) { return; }

			intersects.push( {

				distance: distance,
				point: _intersectPoint.clone(),
				uv: Triangle.getUV( _intersectPoint, _vA$1, _vB$1, _vC$1, _uvA$1, _uvB$1, _uvC$1, new Vector2() ),
				face: null,
				object: this

			} );

		},

		clone: function () {

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

		},

		copy: function ( source ) {

			Object3D.prototype.copy.call( this, source );

			if ( source.center !== undefined ) { this.center.copy( source.center ); }

			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 );

	}

	/**
	 * @author mikael emtinger / http://gomo.se/
	 * @author alteredq / http://alteredqualia.com/
	 * @author mrdoob / http://mrdoob.com/
	 */

	var _v1$4 = new Vector3();
	var _v2$2 = new Vector3();

	function LOD() {

		Object3D.call( this );

		this._currentLevel = 0;

		this.type = 'LOD';

		Object.defineProperties( this, {
			levels: {
				enumerable: true,
				value: []
			}
		} );

		this.autoUpdate = true;

	}

	LOD.prototype = Object.assign( Object.create( Object3D.prototype ), {

		constructor: LOD,

		isLOD: true,

		copy: function ( source ) {

			Object3D.prototype.copy.call( this, source, false );

			var levels = source.levels;

			for ( var i = 0, l = levels.length; i < l; i ++ ) {

				var level = levels[ i ];

				this.addLevel( level.object.clone(), level.distance );

			}

			this.autoUpdate = source.autoUpdate;

			return this;

		},

		addLevel: function ( object, distance ) {

			if ( distance === undefined ) { distance = 0; }

			distance = Math.abs( distance );

			var levels = this.levels;

			for ( var l = 0; l < levels.length; l ++ ) {

				if ( distance < levels[ l ].distance ) {

					break;

				}

			}

			levels.splice( l, 0, { distance: distance, object: object } );

			this.add( object );

			return this;

		},

		getCurrentLevel: function () {

			return this._currentLevel;

		},

		getObjectForDistance: function ( distance ) {

			var levels = this.levels;

			if ( levels.length > 0 ) {

				for ( var i = 1, l = levels.length; i < l; i ++ ) {

					if ( distance < levels[ i ].distance ) {

						break;

					}

				}

				return levels[ i - 1 ].object;

			}

			return null;

		},

		raycast: function ( raycaster, intersects ) {

			var levels = this.levels;

			if ( levels.length > 0 ) {

				_v1$4.setFromMatrixPosition( this.matrixWorld );

				var distance = raycaster.ray.origin.distanceTo( _v1$4 );

				this.getObjectForDistance( distance ).raycast( raycaster, intersects );

			}

		},

		update: function ( camera ) {

			var levels = this.levels;

			if ( levels.length > 1 ) {

				_v1$4.setFromMatrixPosition( camera.matrixWorld );
				_v2$2.setFromMatrixPosition( this.matrixWorld );

				var distance = _v1$4.distanceTo( _v2$2 ) / camera.zoom;

				levels[ 0 ].object.visible = true;

				for ( var i = 1, l = levels.length; i < l; i ++ ) {

					if ( distance >= levels[ i ].distance ) {

						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: function ( meta ) {

			var data = Object3D.prototype.toJSON.call( this, meta );

			if ( this.autoUpdate === false ) { data.object.autoUpdate = false; }

			data.object.levels = [];

			var levels = this.levels;

			for ( var i = 0, l = levels.length; i < l; i ++ ) {

				var level = levels[ i ];

				data.object.levels.push( {
					object: level.object.uuid,
					distance: level.distance
				} );

			}

			return data;

		}

	} );

	/**
	 * @author mikael emtinger / http://gomo.se/
	 * @author alteredq / http://alteredqualia.com/
	 * @author ikerr / http://verold.com
	 */

	function SkinnedMesh( geometry, material ) {

		if ( geometry && geometry.isGeometry ) {

			console.error( 'THREE.SkinnedMesh no longer supports THREE.Geometry. Use THREE.BufferGeometry instead.' );

		}

		Mesh.call( this, geometry, material );

		this.type = 'SkinnedMesh';

		this.bindMode = 'attached';
		this.bindMatrix = new Matrix4();
		this.bindMatrixInverse = new Matrix4();

	}

	SkinnedMesh.prototype = Object.assign( Object.create( Mesh.prototype ), {

		constructor: SkinnedMesh,

		isSkinnedMesh: true,

		bind: function ( skeleton, bindMatrix ) {

			this.skeleton = skeleton;

			if ( bindMatrix === undefined ) {

				this.updateMatrixWorld( true );

				this.skeleton.calculateInverses();

				bindMatrix = this.matrixWorld;

			}

			this.bindMatrix.copy( bindMatrix );
			this.bindMatrixInverse.getInverse( bindMatrix );

		},

		pose: function () {

			this.skeleton.pose();

		},

		normalizeSkinWeights: function () {

			var vector = new Vector4();

			var skinWeight = this.geometry.attributes.skinWeight;

			for ( var i = 0, l = skinWeight.count; i < l; i ++ ) {

				vector.x = skinWeight.getX( i );
				vector.y = skinWeight.getY( i );
				vector.z = skinWeight.getZ( i );
				vector.w = skinWeight.getW( i );

				var 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: function ( force ) {

			Mesh.prototype.updateMatrixWorld.call( this, force );

			if ( this.bindMode === 'attached' ) {

				this.bindMatrixInverse.getInverse( this.matrixWorld );

			} else if ( this.bindMode === 'detached' ) {

				this.bindMatrixInverse.getInverse( this.bindMatrix );

			} else {

				console.warn( 'THREE.SkinnedMesh: Unrecognized bindMode: ' + this.bindMode );

			}

		},

		clone: function () {

			return new this.constructor( this.geometry, this.material ).copy( this );

		}

	} );

	/**
	 * @author mikael emtinger / http://gomo.se/
	 * @author alteredq / http://alteredqualia.com/
	 * @author michael guerrero / http://realitymeltdown.com
	 * @author ikerr / http://verold.com
	 */

	var _offsetMatrix = new Matrix4();
	var _identityMatrix = new Matrix4();

	function Skeleton( bones, boneInverses ) {

		// copy the bone array

		bones = bones || [];

		this.bones = bones.slice( 0 );
		this.boneMatrices = new Float32Array( this.bones.length * 16 );

		this.frame = - 1;

		// use the supplied bone inverses or calculate the inverses

		if ( boneInverses === undefined ) {

			this.calculateInverses();

		} else {

			if ( this.bones.length === boneInverses.length ) {

				this.boneInverses = boneInverses.slice( 0 );

			} else {

				console.warn( 'THREE.Skeleton boneInverses is the wrong length.' );

				this.boneInverses = [];

				for ( var i = 0, il = this.bones.length; i < il; i ++ ) {

					this.boneInverses.push( new Matrix4() );

				}

			}

		}

	}

	Object.assign( Skeleton.prototype, {

		calculateInverses: function () {

			this.boneInverses = [];

			for ( var i = 0, il = this.bones.length; i < il; i ++ ) {

				var inverse = new Matrix4();

				if ( this.bones[ i ] ) {

					inverse.getInverse( this.bones[ i ].matrixWorld );

				}

				this.boneInverses.push( inverse );

			}

		},

		pose: function () {

			var bone, i, il;

			// recover the bind-time world matrices

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

				bone = this.bones[ i ];

				if ( bone ) {

					bone.matrixWorld.getInverse( this.boneInverses[ i ] );

				}

			}

			// compute the local matrices, positions, rotations and scales

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

				bone = this.bones[ i ];

				if ( bone ) {

					if ( bone.parent && bone.parent.isBone ) {

						bone.matrix.getInverse( bone.parent.matrixWorld );
						bone.matrix.multiply( bone.matrixWorld );

					} else {

						bone.matrix.copy( bone.matrixWorld );

					}

					bone.matrix.decompose( bone.position, bone.quaternion, bone.scale );

				}

			}

		},

		update: function () {

			var bones = this.bones;
			var boneInverses = this.boneInverses;
			var boneMatrices = this.boneMatrices;
			var boneTexture = this.boneTexture;

			// flatten bone matrices to array

			for ( var i = 0, il = bones.length; i < il; i ++ ) {

				// compute the offset between the current and the original transform

				var matrix = bones[ i ] ? bones[ i ].matrixWorld : _identityMatrix;

				_offsetMatrix.multiplyMatrices( matrix, boneInverses[ i ] );
				_offsetMatrix.toArray( boneMatrices, i * 16 );

			}

			if ( boneTexture !== undefined ) {

				boneTexture.needsUpdate = true;

			}

		},

		clone: function () {

			return new Skeleton( this.bones, this.boneInverses );

		},

		getBoneByName: function ( name ) {

			for ( var i = 0, il = this.bones.length; i < il; i ++ ) {

				var bone = this.bones[ i ];

				if ( bone.name === name ) {

					return bone;

				}

			}

			return undefined;

		}

	} );

	/**
	 * @author mikael emtinger / http://gomo.se/
	 * @author alteredq / http://alteredqualia.com/
	 * @author ikerr / http://verold.com
	 */

	function Bone() {

		Object3D.call( this );

		this.type = 'Bone';

	}

	Bone.prototype = Object.assign( Object.create( Object3D.prototype ), {

		constructor: Bone,

		isBone: true

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	var _instanceLocalMatrix = new Matrix4();
	var _instanceWorldMatrix = new Matrix4();

	var _instanceIntersects = [];

	var _mesh = new Mesh();

	function InstancedMesh( geometry, material, count ) {

		Mesh.call( this, geometry, material );

		this.instanceMatrix = new BufferAttribute( new Float32Array( count * 16 ), 16 );

		this.count = count;

		this.frustumCulled = false;

	}

	InstancedMesh.prototype = Object.assign( Object.create( Mesh.prototype ), {

		constructor: InstancedMesh,

		isInstancedMesh: true,

		getMatrixAt: function ( index, matrix ) {

			matrix.fromArray( this.instanceMatrix.array, index * 16 );

		},

		raycast: function ( raycaster, intersects ) {

			var matrixWorld = this.matrixWorld;
			var raycastTimes = this.count;

			_mesh.geometry = this.geometry;
			_mesh.material = this.material;

			if ( _mesh.material === undefined ) { return; }

			for ( var 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.matrixWorld = _instanceWorldMatrix;

				_mesh.raycast( raycaster, _instanceIntersects );

				// process the result of raycast

				if ( _instanceIntersects.length > 0 ) {

					_instanceIntersects[ 0 ].instanceId = instanceId;
					_instanceIntersects[ 0 ].object = this;

					intersects.push( _instanceIntersects[ 0 ] );

					_instanceIntersects.length = 0;

				}

			}

		},

		setMatrixAt: function ( index, matrix ) {

			matrix.toArray( this.instanceMatrix.array, index * 16 );

		},

		updateMorphTargets: function () {

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author alteredq / http://alteredqualia.com/
	 *
	 * parameters = {
	 *  color: <hex>,
	 *  opacity: <float>,
	 *
	 *  linewidth: <float>,
	 *  linecap: "round",
	 *  linejoin: "round"
	 * }
	 */

	function LineBasicMaterial( parameters ) {

		Material.call( this );

		this.type = 'LineBasicMaterial';

		this.color = new Color( 0xffffff );

		this.linewidth = 1;
		this.linecap = 'round';
		this.linejoin = 'round';

		this.setValues( parameters );

	}

	LineBasicMaterial.prototype = Object.create( Material.prototype );
	LineBasicMaterial.prototype.constructor = LineBasicMaterial;

	LineBasicMaterial.prototype.isLineBasicMaterial = true;

	LineBasicMaterial.prototype.copy = function ( source ) {

		Material.prototype.copy.call( this, source );

		this.color.copy( source.color );

		this.linewidth = source.linewidth;
		this.linecap = source.linecap;
		this.linejoin = source.linejoin;

		return this;

	};

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	var _start = new Vector3();
	var _end = new Vector3();
	var _inverseMatrix$1 = new Matrix4();
	var _ray$1 = new Ray();
	var _sphere$2 = new Sphere();

	function Line( geometry, material, mode ) {

		if ( mode === 1 ) {

			console.error( 'THREE.Line: parameter THREE.LinePieces no longer supported. Use THREE.LineSegments instead.' );

		}

		Object3D.call( this );

		this.type = 'Line';

		this.geometry = geometry !== undefined ? geometry : new BufferGeometry();
		this.material = material !== undefined ? material : new LineBasicMaterial();

	}

	Line.prototype = Object.assign( Object.create( Object3D.prototype ), {

		constructor: Line,

		isLine: true,

		computeLineDistances: function () {

			var geometry = this.geometry;

			if ( geometry.isBufferGeometry ) {

				// we assume non-indexed geometry

				if ( geometry.index === null ) {

					var positionAttribute = geometry.attributes.position;
					var lineDistances = [ 0 ];

					for ( var i = 1, l = positionAttribute.count; i < l; i ++ ) {

						_start.fromBufferAttribute( positionAttribute, i - 1 );
						_end.fromBufferAttribute( positionAttribute, i );

						lineDistances[ i ] = lineDistances[ i - 1 ];
						lineDistances[ i ] += _start.distanceTo( _end );

					}

					geometry.setAttribute( 'lineDistance', new Float32BufferAttribute( lineDistances, 1 ) );

				} else {

					console.warn( 'THREE.Line.computeLineDistances(): Computation only possible with non-indexed BufferGeometry.' );

				}

			} else if ( geometry.isGeometry ) {

				var vertices = geometry.vertices;
				var lineDistances = geometry.lineDistances;

				lineDistances[ 0 ] = 0;

				for ( var i = 1, l = vertices.length; i < l; i ++ ) {

					lineDistances[ i ] = lineDistances[ i - 1 ];
					lineDistances[ i ] += vertices[ i - 1 ].distanceTo( vertices[ i ] );

				}

			}

			return this;

		},

		raycast: function ( raycaster, intersects ) {

			var geometry = this.geometry;
			var matrixWorld = this.matrixWorld;
			var threshold = raycaster.params.Line.threshold;

			// Checking boundingSphere distance to ray

			if ( geometry.boundingSphere === null ) { geometry.computeBoundingSphere(); }

			_sphere$2.copy( geometry.boundingSphere );
			_sphere$2.applyMatrix4( matrixWorld );
			_sphere$2.radius += threshold;

			if ( raycaster.ray.intersectsSphere( _sphere$2 ) === false ) { return; }

			//

			_inverseMatrix$1.getInverse( matrixWorld );
			_ray$1.copy( raycaster.ray ).applyMatrix4( _inverseMatrix$1 );

			var localThreshold = threshold / ( ( this.scale.x + this.scale.y + this.scale.z ) / 3 );
			var localThresholdSq = localThreshold * localThreshold;

			var vStart = new Vector3();
			var vEnd = new Vector3();
			var interSegment = new Vector3();
			var interRay = new Vector3();
			var step = ( this && this.isLineSegments ) ? 2 : 1;

			if ( geometry.isBufferGeometry ) {

				var index = geometry.index;
				var attributes = geometry.attributes;
				var positions = attributes.position.array;

				if ( index !== null ) {

					var indices = index.array;

					for ( var i = 0, l = indices.length - 1; i < l; i += step ) {

						var a = indices[ i ];
						var b = indices[ i + 1 ];

						vStart.fromArray( positions, a * 3 );
						vEnd.fromArray( positions, b * 3 );

						var distSq = _ray$1.distanceSqToSegment( vStart, vEnd, interRay, interSegment );

						if ( distSq > localThresholdSq ) { continue; }

						interRay.applyMatrix4( this.matrixWorld ); //Move back to world space for distance calculation

						var distance = raycaster.ray.origin.distanceTo( interRay );

						if ( distance < raycaster.near || distance > raycaster.far ) { continue; }

						intersects.push( {

							distance: distance,
							// What do we want? intersection point on the ray or on the segment??
							// point: raycaster.ray.at( distance ),
							point: interSegment.clone().applyMatrix4( this.matrixWorld ),
							index: i,
							face: null,
							faceIndex: null,
							object: this

						} );

					}

				} else {

					for ( var i = 0, l = positions.length / 3 - 1; i < l; i += step ) {

						vStart.fromArray( positions, 3 * i );
						vEnd.fromArray( positions, 3 * i + 3 );

						var distSq = _ray$1.distanceSqToSegment( vStart, vEnd, interRay, interSegment );

						if ( distSq > localThresholdSq ) { continue; }

						interRay.applyMatrix4( this.matrixWorld ); //Move back to world space for distance calculation

						var distance = raycaster.ray.origin.distanceTo( interRay );

						if ( distance < raycaster.near || distance > raycaster.far ) { continue; }

						intersects.push( {

							distance: distance,
							// What do we want? intersection point on the ray or on the segment??
							// point: raycaster.ray.at( distance ),
							point: interSegment.clone().applyMatrix4( this.matrixWorld ),
							index: i,
							face: null,
							faceIndex: null,
							object: this

						} );

					}

				}

			} else if ( geometry.isGeometry ) {

				var vertices = geometry.vertices;
				var nbVertices = vertices.length;

				for ( var i = 0; i < nbVertices - 1; i += step ) {

					var distSq = _ray$1.distanceSqToSegment( vertices[ i ], vertices[ i + 1 ], interRay, interSegment );

					if ( distSq > localThresholdSq ) { continue; }

					interRay.applyMatrix4( this.matrixWorld ); //Move back to world space for distance calculation

					var distance = raycaster.ray.origin.distanceTo( interRay );

					if ( distance < raycaster.near || distance > raycaster.far ) { continue; }

					intersects.push( {

						distance: distance,
						// What do we want? intersection point on the ray or on the segment??
						// point: raycaster.ray.at( distance ),
						point: interSegment.clone().applyMatrix4( this.matrixWorld ),
						index: i,
						face: null,
						faceIndex: null,
						object: this

					} );

				}

			}

		},

		clone: function () {

			return new this.constructor( this.geometry, this.material ).copy( this );

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	var _start$1 = new Vector3();
	var _end$1 = new Vector3();

	function LineSegments( geometry, material ) {

		Line.call( this, geometry, material );

		this.type = 'LineSegments';

	}

	LineSegments.prototype = Object.assign( Object.create( Line.prototype ), {

		constructor: LineSegments,

		isLineSegments: true,

		computeLineDistances: function () {

			var geometry = this.geometry;

			if ( geometry.isBufferGeometry ) {

				// we assume non-indexed geometry

				if ( geometry.index === null ) {

					var positionAttribute = geometry.attributes.position;
					var lineDistances = [];

					for ( var i = 0, l = positionAttribute.count; i < l; i += 2 ) {

						_start$1.fromBufferAttribute( positionAttribute, i );
						_end$1.fromBufferAttribute( positionAttribute, i + 1 );

						lineDistances[ i ] = ( i === 0 ) ? 0 : lineDistances[ i - 1 ];
						lineDistances[ i + 1 ] = lineDistances[ i ] + _start$1.distanceTo( _end$1 );

					}

					geometry.setAttribute( 'lineDistance', new Float32BufferAttribute( lineDistances, 1 ) );

				} else {

					console.warn( 'THREE.LineSegments.computeLineDistances(): Computation only possible with non-indexed BufferGeometry.' );

				}

			} else if ( geometry.isGeometry ) {

				var vertices = geometry.vertices;
				var lineDistances = geometry.lineDistances;

				for ( var i = 0, l = vertices.length; i < l; i += 2 ) {

					_start$1.copy( vertices[ i ] );
					_end$1.copy( vertices[ i + 1 ] );

					lineDistances[ i ] = ( i === 0 ) ? 0 : lineDistances[ i - 1 ];
					lineDistances[ i + 1 ] = lineDistances[ i ] + _start$1.distanceTo( _end$1 );

				}

			}

			return this;

		}

	} );

	/**
	 * @author mgreter / http://github.com/mgreter
	 */

	function LineLoop( geometry, material ) {

		Line.call( this, geometry, material );

		this.type = 'LineLoop';

	}

	LineLoop.prototype = Object.assign( Object.create( Line.prototype ), {

		constructor: LineLoop,

		isLineLoop: true,

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author alteredq / http://alteredqualia.com/
	 *
	 * parameters = {
	 *  color: <hex>,
	 *  opacity: <float>,
	 *  map: new THREE.Texture( <Image> ),
	 *  alphaMap: new THREE.Texture( <Image> ),
	 *
	 *  size: <float>,
	 *  sizeAttenuation: <bool>
	 *
	 *  morphTargets: <bool>
	 * }
	 */

	function PointsMaterial( parameters ) {

		Material.call( this );

		this.type = 'PointsMaterial';

		this.color = new Color( 0xffffff );

		this.map = null;

		this.alphaMap = null;

		this.size = 1;
		this.sizeAttenuation = true;

		this.morphTargets = false;

		this.setValues( parameters );

	}

	PointsMaterial.prototype = Object.create( Material.prototype );
	PointsMaterial.prototype.constructor = PointsMaterial;

	PointsMaterial.prototype.isPointsMaterial = true;

	PointsMaterial.prototype.copy = function ( source ) {

		Material.prototype.copy.call( this, source );

		this.color.copy( source.color );

		this.map = source.map;

		this.alphaMap = source.alphaMap;

		this.size = source.size;
		this.sizeAttenuation = source.sizeAttenuation;

		this.morphTargets = source.morphTargets;

		return this;

	};

	/**
	 * @author alteredq / http://alteredqualia.com/
	 */

	var _inverseMatrix$2 = new Matrix4();
	var _ray$2 = new Ray();
	var _sphere$3 = new Sphere();
	var _position$1 = new Vector3();

	function Points( geometry, material ) {

		Object3D.call( this );

		this.type = 'Points';

		this.geometry = geometry !== undefined ? geometry : new BufferGeometry();
		this.material = material !== undefined ? material : new PointsMaterial();

		this.updateMorphTargets();

	}

	Points.prototype = Object.assign( Object.create( Object3D.prototype ), {

		constructor: Points,

		isPoints: true,

		raycast: function ( raycaster, intersects ) {

			var geometry = this.geometry;
			var matrixWorld = this.matrixWorld;
			var threshold = raycaster.params.Points.threshold;

			// Checking boundingSphere distance to ray

			if ( geometry.boundingSphere === null ) { geometry.computeBoundingSphere(); }

			_sphere$3.copy( geometry.boundingSphere );
			_sphere$3.applyMatrix4( matrixWorld );
			_sphere$3.radius += threshold;

			if ( raycaster.ray.intersectsSphere( _sphere$3 ) === false ) { return; }

			//

			_inverseMatrix$2.getInverse( matrixWorld );
			_ray$2.copy( raycaster.ray ).applyMatrix4( _inverseMatrix$2 );

			var localThreshold = threshold / ( ( this.scale.x + this.scale.y + this.scale.z ) / 3 );
			var localThresholdSq = localThreshold * localThreshold;

			if ( geometry.isBufferGeometry ) {

				var index = geometry.index;
				var attributes = geometry.attributes;
				var positions = attributes.position.array;

				if ( index !== null ) {

					var indices = index.array;

					for ( var i = 0, il = indices.length; i < il; i ++ ) {

						var a = indices[ i ];

						_position$1.fromArray( positions, a * 3 );

						testPoint( _position$1, a, localThresholdSq, matrixWorld, raycaster, intersects, this );

					}

				} else {

					for ( var i = 0, l = positions.length / 3; i < l; i ++ ) {

						_position$1.fromArray( positions, i * 3 );

						testPoint( _position$1, i, localThresholdSq, matrixWorld, raycaster, intersects, this );

					}

				}

			} else {

				var vertices = geometry.vertices;

				for ( var i = 0, l = vertices.length; i < l; i ++ ) {

					testPoint( vertices[ i ], i, localThresholdSq, matrixWorld, raycaster, intersects, this );

				}

			}

		},

		updateMorphTargets: function () {

			var geometry = this.geometry;
			var m, ml, name;

			if ( geometry.isBufferGeometry ) {

				var morphAttributes = geometry.morphAttributes;
				var keys = Object.keys( morphAttributes );

				if ( keys.length > 0 ) {

					var morphAttribute = morphAttributes[ keys[ 0 ] ];

					if ( morphAttribute !== undefined ) {

						this.morphTargetInfluences = [];
						this.morphTargetDictionary = {};

						for ( m = 0, ml = morphAttribute.length; m < ml; m ++ ) {

							name = morphAttribute[ m ].name || String( m );

							this.morphTargetInfluences.push( 0 );
							this.morphTargetDictionary[ name ] = m;

						}

					}

				}

			} else {

				var morphTargets = geometry.morphTargets;

				if ( morphTargets !== undefined && morphTargets.length > 0 ) {

					console.error( 'THREE.Points.updateMorphTargets() does not support THREE.Geometry. Use THREE.BufferGeometry instead.' );

				}

			}

		},

		clone: function () {

			return new this.constructor( this.geometry, this.material ).copy( this );

		}

	} );

	function testPoint( point, index, localThresholdSq, matrixWorld, raycaster, intersects, object ) {

		var rayPointDistanceSq = _ray$2.distanceSqToPoint( point );

		if ( rayPointDistanceSq < localThresholdSq ) {

			var intersectPoint = new Vector3();

			_ray$2.closestPointToPoint( point, intersectPoint );
			intersectPoint.applyMatrix4( matrixWorld );

			var 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

			} );

		}

	}

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function VideoTexture( video, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy ) {

		Texture.call( this, video, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy );

		this.format = format !== undefined ? format : RGBFormat;

		this.minFilter = minFilter !== undefined ? minFilter : LinearFilter;
		this.magFilter = magFilter !== undefined ? magFilter : LinearFilter;

		this.generateMipmaps = false;

	}

	VideoTexture.prototype = Object.assign( Object.create( Texture.prototype ), {

		constructor: VideoTexture,

		isVideoTexture: true,

		update: function () {

			var video = this.image;

			if ( video.readyState >= video.HAVE_CURRENT_DATA ) {

				this.needsUpdate = true;

			}

		}

	} );

	/**
	 * @author alteredq / http://alteredqualia.com/
	 */

	function CompressedTexture( mipmaps, width, height, format, type, mapping, wrapS, wrapT, magFilter, minFilter, anisotropy, encoding ) {

		Texture.call( this, null, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy, encoding );

		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;

	}

	CompressedTexture.prototype = Object.create( Texture.prototype );
	CompressedTexture.prototype.constructor = CompressedTexture;

	CompressedTexture.prototype.isCompressedTexture = true;

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function CanvasTexture( canvas, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy ) {

		Texture.call( this, canvas, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy );

		this.needsUpdate = true;

	}

	CanvasTexture.prototype = Object.create( Texture.prototype );
	CanvasTexture.prototype.constructor = CanvasTexture;
	CanvasTexture.prototype.isCanvasTexture = true;

	/**
	 * @author Matt DesLauriers / @mattdesl
	 * @author atix / arthursilber.de
	 */

	function DepthTexture( width, height, type, mapping, wrapS, wrapT, magFilter, minFilter, anisotropy, format ) {

		format = format !== undefined ? 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 = UnsignedShortType; }
		if ( type === undefined && format === DepthStencilFormat ) { type = UnsignedInt248Type; }

		Texture.call( this, null, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy );

		this.image = { width: width, height: height };

		this.magFilter = magFilter !== undefined ? magFilter : NearestFilter;
		this.minFilter = minFilter !== undefined ? minFilter : NearestFilter;

		this.flipY = false;
		this.generateMipmaps	= false;

	}

	DepthTexture.prototype = Object.create( Texture.prototype );
	DepthTexture.prototype.constructor = DepthTexture;
	DepthTexture.prototype.isDepthTexture = true;

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author Mugen87 / https://github.com/Mugen87
	 */

	function WireframeGeometry( geometry ) {

		BufferGeometry.call( this );

		this.type = 'WireframeGeometry';

		// buffer

		var vertices = [];

		// helper variables

		var i, j, l, o, ol;
		var edge = [ 0, 0 ], edges = {}, e, edge1, edge2;
		var key, keys = [ 'a', 'b', 'c' ];
		var vertex;

		// different logic for Geometry and BufferGeometry

		if ( geometry && geometry.isGeometry ) {

			// create a data structure that contains all edges without duplicates

			var faces = geometry.faces;

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

				var face = faces[ i ];

				for ( j = 0; j < 3; j ++ ) {

					edge1 = face[ keys[ j ] ];
					edge2 = face[ keys[ ( j + 1 ) % 3 ] ];
					edge[ 0 ] = Math.min( edge1, edge2 ); // sorting prevents duplicates
					edge[ 1 ] = Math.max( edge1, edge2 );

					key = edge[ 0 ] + ',' + edge[ 1 ];

					if ( edges[ key ] === undefined ) {

						edges[ key ] = { index1: edge[ 0 ], index2: edge[ 1 ] };

					}

				}

			}

			// generate vertices

			for ( key in edges ) {

				e = edges[ key ];

				vertex = geometry.vertices[ e.index1 ];
				vertices.push( vertex.x, vertex.y, vertex.z );

				vertex = geometry.vertices[ e.index2 ];
				vertices.push( vertex.x, vertex.y, vertex.z );

			}

		} else if ( geometry && geometry.isBufferGeometry ) {

			var position, indices, groups;
			var group, start, count;
			var index1, index2;

			vertex = new Vector3();

			if ( geometry.index !== null ) {

				// indexed BufferGeometry

				position = geometry.attributes.position;
				indices = geometry.index;
				groups = geometry.groups;

				if ( groups.length === 0 ) {

					groups = [ { start: 0, count: indices.count, materialIndex: 0 } ];

				}

				// create a data structure that contains all eges without duplicates

				for ( o = 0, ol = groups.length; o < ol; ++ o ) {

					group = groups[ o ];

					start = group.start;
					count = group.count;

					for ( i = start, l = ( start + count ); i < l; i += 3 ) {

						for ( j = 0; j < 3; j ++ ) {

							edge1 = indices.getX( i + j );
							edge2 = indices.getX( i + ( j + 1 ) % 3 );
							edge[ 0 ] = Math.min( edge1, edge2 ); // sorting prevents duplicates
							edge[ 1 ] = Math.max( edge1, edge2 );

							key = edge[ 0 ] + ',' + edge[ 1 ];

							if ( edges[ key ] === undefined ) {

								edges[ key ] = { index1: edge[ 0 ], index2: edge[ 1 ] };

							}

						}

					}

				}

				// generate vertices

				for ( key in edges ) {

					e = edges[ key ];

					vertex.fromBufferAttribute( position, e.index1 );
					vertices.push( vertex.x, vertex.y, vertex.z );

					vertex.fromBufferAttribute( position, e.index2 );
					vertices.push( vertex.x, vertex.y, vertex.z );

				}

			} else {

				// non-indexed BufferGeometry

				position = geometry.attributes.position;

				for ( i = 0, l = ( position.count / 3 ); i < l; i ++ ) {

					for ( 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)

						index1 = 3 * i + j;
						vertex.fromBufferAttribute( position, index1 );
						vertices.push( vertex.x, vertex.y, vertex.z );

						index2 = 3 * i + ( ( j + 1 ) % 3 );
						vertex.fromBufferAttribute( position, index2 );
						vertices.push( vertex.x, vertex.y, vertex.z );

					}

				}

			}

		}

		// build geometry

		this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );

	}

	WireframeGeometry.prototype = Object.create( BufferGeometry.prototype );
	WireframeGeometry.prototype.constructor = WireframeGeometry;

	/**
	 * @author zz85 / https://github.com/zz85
	 * @author Mugen87 / https://github.com/Mugen87
	 *
	 * Parametric Surfaces Geometry
	 * based on the brilliant article by @prideout https://prideout.net/blog/old/blog/index.html@p=44.html
	 */

	// ParametricGeometry

	function ParametricGeometry( func, slices, stacks ) {

		Geometry.call( this );

		this.type = 'ParametricGeometry';

		this.parameters = {
			func: func,
			slices: slices,
			stacks: stacks
		};

		this.fromBufferGeometry( new ParametricBufferGeometry( func, slices, stacks ) );
		this.mergeVertices();

	}

	ParametricGeometry.prototype = Object.create( Geometry.prototype );
	ParametricGeometry.prototype.constructor = ParametricGeometry;

	// ParametricBufferGeometry

	function ParametricBufferGeometry( func, slices, stacks ) {

		BufferGeometry.call( this );

		this.type = 'ParametricBufferGeometry';

		this.parameters = {
			func: func,
			slices: slices,
			stacks: stacks
		};

		// buffers

		var indices = [];
		var vertices = [];
		var normals = [];
		var uvs = [];

		var EPS = 0.00001;

		var normal = new Vector3();

		var p0 = new Vector3(), p1 = new Vector3();
		var pu = new Vector3(), pv = new Vector3();

		var i, j;

		if ( func.length < 3 ) {

			console.error( 'THREE.ParametricGeometry: Function must now modify a Vector3 as third parameter.' );

		}

		// generate vertices, normals and uvs

		var sliceCount = slices + 1;

		for ( i = 0; i <= stacks; i ++ ) {

			var v = i / stacks;

			for ( j = 0; j <= slices; j ++ ) {

				var u = j / slices;

				// vertex

				func( u, v, p0 );
				vertices.push( p0.x, p0.y, p0.z );

				// normal

				// approximate tangent vectors via finite differences

				if ( u - EPS >= 0 ) {

					func( u - EPS, v, p1 );
					pu.subVectors( p0, p1 );

				} else {

					func( u + EPS, v, p1 );
					pu.subVectors( p1, p0 );

				}

				if ( v - EPS >= 0 ) {

					func( u, v - EPS, p1 );
					pv.subVectors( p0, p1 );

				} else {

					func( u, v + EPS, p1 );
					pv.subVectors( p1, p0 );

				}

				// cross product of tangent vectors returns surface normal

				normal.crossVectors( pu, pv ).normalize();
				normals.push( normal.x, normal.y, normal.z );

				// uv

				uvs.push( u, v );

			}

		}

		// generate indices

		for ( i = 0; i < stacks; i ++ ) {

			for ( j = 0; j < slices; j ++ ) {

				var a = i * sliceCount + j;
				var b = i * sliceCount + j + 1;
				var c = ( i + 1 ) * sliceCount + j + 1;
				var d = ( i + 1 ) * sliceCount + j;

				// faces one and two

				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 ) );

	}

	ParametricBufferGeometry.prototype = Object.create( BufferGeometry.prototype );
	ParametricBufferGeometry.prototype.constructor = ParametricBufferGeometry;

	/**
	 * @author clockworkgeek / https://github.com/clockworkgeek
	 * @author timothypratley / https://github.com/timothypratley
	 * @author WestLangley / http://github.com/WestLangley
	 * @author Mugen87 / https://github.com/Mugen87
	 */

	// PolyhedronGeometry

	function PolyhedronGeometry( vertices, indices, radius, detail ) {

		Geometry.call( this );

		this.type = 'PolyhedronGeometry';

		this.parameters = {
			vertices: vertices,
			indices: indices,
			radius: radius,
			detail: detail
		};

		this.fromBufferGeometry( new PolyhedronBufferGeometry( vertices, indices, radius, detail ) );
		this.mergeVertices();

	}

	PolyhedronGeometry.prototype = Object.create( Geometry.prototype );
	PolyhedronGeometry.prototype.constructor = PolyhedronGeometry;

	// PolyhedronBufferGeometry

	function PolyhedronBufferGeometry( vertices, indices, radius, detail ) {

		BufferGeometry.call( this );

		this.type = 'PolyhedronBufferGeometry';

		this.parameters = {
			vertices: vertices,
			indices: indices,
			radius: radius,
			detail: detail
		};

		radius = radius || 1;
		detail = detail || 0;

		// default buffer data

		var vertexBuffer = [];
		var 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 ) {

			var a = new Vector3();
			var b = new Vector3();
			var c = new Vector3();

			// iterate over all faces and apply a subdivison with the given detail value

			for ( var 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 ) {

			var cols = Math.pow( 2, detail );

			// we use this multidimensional array as a data structure for creating the subdivision

			var v = [];

			var i, j;

			// construct all of the vertices for this subdivision

			for ( i = 0; i <= cols; i ++ ) {

				v[ i ] = [];

				var aj = a.clone().lerp( c, i / cols );
				var bj = b.clone().lerp( c, i / cols );

				var rows = cols - i;

				for ( 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 ( i = 0; i < cols; i ++ ) {

				for ( j = 0; j < 2 * ( cols - i ) - 1; j ++ ) {

					var 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 ) {

			var vertex = new Vector3();

			// iterate over the entire buffer and apply the radius to each vertex

			for ( var 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() {

			var vertex = new Vector3();

			for ( var i = 0; i < vertexBuffer.length; i += 3 ) {

				vertex.x = vertexBuffer[ i + 0 ];
				vertex.y = vertexBuffer[ i + 1 ];
				vertex.z = vertexBuffer[ i + 2 ];

				var u = azimuth( vertex ) / 2 / Math.PI + 0.5;
				var 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 ( var i = 0; i < uvBuffer.length; i += 6 ) {

				// uv data of a single face

				var x0 = uvBuffer[ i + 0 ];
				var x1 = uvBuffer[ i + 2 ];
				var x2 = uvBuffer[ i + 4 ];

				var max = Math.max( x0, x1, x2 );
				var 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 ) {

			var stride = index * 3;

			vertex.x = vertices[ stride + 0 ];
			vertex.y = vertices[ stride + 1 ];
			vertex.z = vertices[ stride + 2 ];

		}

		function correctUVs() {

			var a = new Vector3();
			var b = new Vector3();
			var c = new Vector3();

			var centroid = new Vector3();

			var uvA = new Vector2();
			var uvB = new Vector2();
			var uvC = new Vector2();

			for ( var 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 );

				var 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 ) ) );

		}

	}

	PolyhedronBufferGeometry.prototype = Object.create( BufferGeometry.prototype );
	PolyhedronBufferGeometry.prototype.constructor = PolyhedronBufferGeometry;

	/**
	 * @author timothypratley / https://github.com/timothypratley
	 * @author Mugen87 / https://github.com/Mugen87
	 */

	// TetrahedronGeometry

	function TetrahedronGeometry( radius, detail ) {

		Geometry.call( this );

		this.type = 'TetrahedronGeometry';

		this.parameters = {
			radius: radius,
			detail: detail
		};

		this.fromBufferGeometry( new TetrahedronBufferGeometry( radius, detail ) );
		this.mergeVertices();

	}

	TetrahedronGeometry.prototype = Object.create( Geometry.prototype );
	TetrahedronGeometry.prototype.constructor = TetrahedronGeometry;

	// TetrahedronBufferGeometry

	function TetrahedronBufferGeometry( radius, detail ) {

		var vertices = [
			1, 1, 1, 	- 1, - 1, 1, 	- 1, 1, - 1, 	1, - 1, - 1
		];

		var indices = [
			2, 1, 0, 	0, 3, 2,	1, 3, 0,	2, 3, 1
		];

		PolyhedronBufferGeometry.call( this, vertices, indices, radius, detail );

		this.type = 'TetrahedronBufferGeometry';

		this.parameters = {
			radius: radius,
			detail: detail
		};

	}

	TetrahedronBufferGeometry.prototype = Object.create( PolyhedronBufferGeometry.prototype );
	TetrahedronBufferGeometry.prototype.constructor = TetrahedronBufferGeometry;

	/**
	 * @author timothypratley / https://github.com/timothypratley
	 * @author Mugen87 / https://github.com/Mugen87
	 */

	// OctahedronGeometry

	function OctahedronGeometry( radius, detail ) {

		Geometry.call( this );

		this.type = 'OctahedronGeometry';

		this.parameters = {
			radius: radius,
			detail: detail
		};

		this.fromBufferGeometry( new OctahedronBufferGeometry( radius, detail ) );
		this.mergeVertices();

	}

	OctahedronGeometry.prototype = Object.create( Geometry.prototype );
	OctahedronGeometry.prototype.constructor = OctahedronGeometry;

	// OctahedronBufferGeometry

	function OctahedronBufferGeometry( radius, detail ) {

		var vertices = [
			1, 0, 0, 	- 1, 0, 0,	0, 1, 0,
			0, - 1, 0, 	0, 0, 1,	0, 0, - 1
		];

		var 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
		];

		PolyhedronBufferGeometry.call( this, vertices, indices, radius, detail );

		this.type = 'OctahedronBufferGeometry';

		this.parameters = {
			radius: radius,
			detail: detail
		};

	}

	OctahedronBufferGeometry.prototype = Object.create( PolyhedronBufferGeometry.prototype );
	OctahedronBufferGeometry.prototype.constructor = OctahedronBufferGeometry;

	/**
	 * @author timothypratley / https://github.com/timothypratley
	 * @author Mugen87 / https://github.com/Mugen87
	 */

	// IcosahedronGeometry

	function IcosahedronGeometry( radius, detail ) {

		Geometry.call( this );

		this.type = 'IcosahedronGeometry';

		this.parameters = {
			radius: radius,
			detail: detail
		};

		this.fromBufferGeometry( new IcosahedronBufferGeometry( radius, detail ) );
		this.mergeVertices();

	}

	IcosahedronGeometry.prototype = Object.create( Geometry.prototype );
	IcosahedronGeometry.prototype.constructor = IcosahedronGeometry;

	// IcosahedronBufferGeometry

	function IcosahedronBufferGeometry( radius, detail ) {

		var t = ( 1 + Math.sqrt( 5 ) ) / 2;

		var 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
		];

		var 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
		];

		PolyhedronBufferGeometry.call( this, vertices, indices, radius, detail );

		this.type = 'IcosahedronBufferGeometry';

		this.parameters = {
			radius: radius,
			detail: detail
		};

	}

	IcosahedronBufferGeometry.prototype = Object.create( PolyhedronBufferGeometry.prototype );
	IcosahedronBufferGeometry.prototype.constructor = IcosahedronBufferGeometry;

	/**
	 * @author Abe Pazos / https://hamoid.com
	 * @author Mugen87 / https://github.com/Mugen87
	 */

	// DodecahedronGeometry

	function DodecahedronGeometry( radius, detail ) {

		Geometry.call( this );

		this.type = 'DodecahedronGeometry';

		this.parameters = {
			radius: radius,
			detail: detail
		};

		this.fromBufferGeometry( new DodecahedronBufferGeometry( radius, detail ) );
		this.mergeVertices();

	}

	DodecahedronGeometry.prototype = Object.create( Geometry.prototype );
	DodecahedronGeometry.prototype.constructor = DodecahedronGeometry;

	// DodecahedronBufferGeometry

	function DodecahedronBufferGeometry( radius, detail ) {

		var t = ( 1 + Math.sqrt( 5 ) ) / 2;
		var r = 1 / t;

		var 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
		];

		var 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
		];

		PolyhedronBufferGeometry.call( this, vertices, indices, radius, detail );

		this.type = 'DodecahedronBufferGeometry';

		this.parameters = {
			radius: radius,
			detail: detail
		};

	}

	DodecahedronBufferGeometry.prototype = Object.create( PolyhedronBufferGeometry.prototype );
	DodecahedronBufferGeometry.prototype.constructor = DodecahedronBufferGeometry;

	/**
	 * @author oosmoxiecode / https://github.com/oosmoxiecode
	 * @author WestLangley / https://github.com/WestLangley
	 * @author zz85 / https://github.com/zz85
	 * @author miningold / https://github.com/miningold
	 * @author jonobr1 / https://github.com/jonobr1
	 * @author Mugen87 / https://github.com/Mugen87
	 *
	 */

	// TubeGeometry

	function TubeGeometry( path, tubularSegments, radius, radialSegments, closed, taper ) {

		Geometry.call( this );

		this.type = 'TubeGeometry';

		this.parameters = {
			path: path,
			tubularSegments: tubularSegments,
			radius: radius,
			radialSegments: radialSegments,
			closed: closed
		};

		if ( taper !== undefined ) { console.warn( 'THREE.TubeGeometry: taper has been removed.' ); }

		var bufferGeometry = new TubeBufferGeometry( path, tubularSegments, radius, radialSegments, closed );

		// expose internals

		this.tangents = bufferGeometry.tangents;
		this.normals = bufferGeometry.normals;
		this.binormals = bufferGeometry.binormals;

		// create geometry

		this.fromBufferGeometry( bufferGeometry );
		this.mergeVertices();

	}

	TubeGeometry.prototype = Object.create( Geometry.prototype );
	TubeGeometry.prototype.constructor = TubeGeometry;

	// TubeBufferGeometry

	function TubeBufferGeometry( path, tubularSegments, radius, radialSegments, closed ) {

		BufferGeometry.call( this );

		this.type = 'TubeBufferGeometry';

		this.parameters = {
			path: path,
			tubularSegments: tubularSegments,
			radius: radius,
			radialSegments: radialSegments,
			closed: closed
		};

		tubularSegments = tubularSegments || 64;
		radius = radius || 1;
		radialSegments = radialSegments || 8;
		closed = closed || false;

		var frames = path.computeFrenetFrames( tubularSegments, closed );

		// expose internals

		this.tangents = frames.tangents;
		this.normals = frames.normals;
		this.binormals = frames.binormals;

		// helper variables

		var vertex = new Vector3();
		var normal = new Vector3();
		var uv = new Vector2();
		var P = new Vector3();

		var i, j;

		// buffer

		var vertices = [];
		var normals = [];
		var uvs = [];
		var 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 ( 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

			var N = frames.normals[ i ];
			var B = frames.binormals[ i ];

			// generate normals and vertices for the current segment

			for ( j = 0; j <= radialSegments; j ++ ) {

				var v = j / radialSegments * Math.PI * 2;

				var sin = Math.sin( v );
				var 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 ( j = 1; j <= tubularSegments; j ++ ) {

				for ( i = 1; i <= radialSegments; i ++ ) {

					var a = ( radialSegments + 1 ) * ( j - 1 ) + ( i - 1 );
					var b = ( radialSegments + 1 ) * j + ( i - 1 );
					var c = ( radialSegments + 1 ) * j + i;
					var d = ( radialSegments + 1 ) * ( j - 1 ) + i;

					// faces

					indices.push( a, b, d );
					indices.push( b, c, d );

				}

			}

		}

		function generateUVs() {

			for ( i = 0; i <= tubularSegments; i ++ ) {

				for ( j = 0; j <= radialSegments; j ++ ) {

					uv.x = i / tubularSegments;
					uv.y = j / radialSegments;

					uvs.push( uv.x, uv.y );

				}

			}

		}

	}

	TubeBufferGeometry.prototype = Object.create( BufferGeometry.prototype );
	TubeBufferGeometry.prototype.constructor = TubeBufferGeometry;

	TubeBufferGeometry.prototype.toJSON = function () {

		var data = BufferGeometry.prototype.toJSON.call( this );

		data.path = this.parameters.path.toJSON();

		return data;

	};

	/**
	 * @author oosmoxiecode
	 * @author Mugen87 / https://github.com/Mugen87
	 *
	 * based on http://www.blackpawn.com/texts/pqtorus/
	 */

	// TorusKnotGeometry

	function TorusKnotGeometry( radius, tube, tubularSegments, radialSegments, p, q, heightScale ) {

		Geometry.call( this );

		this.type = 'TorusKnotGeometry';

		this.parameters = {
			radius: radius,
			tube: tube,
			tubularSegments: tubularSegments,
			radialSegments: radialSegments,
			p: p,
			q: q
		};

		if ( heightScale !== undefined ) { console.warn( 'THREE.TorusKnotGeometry: heightScale has been deprecated. Use .scale( x, y, z ) instead.' ); }

		this.fromBufferGeometry( new TorusKnotBufferGeometry( radius, tube, tubularSegments, radialSegments, p, q ) );
		this.mergeVertices();

	}

	TorusKnotGeometry.prototype = Object.create( Geometry.prototype );
	TorusKnotGeometry.prototype.constructor = TorusKnotGeometry;

	// TorusKnotBufferGeometry

	function TorusKnotBufferGeometry( radius, tube, tubularSegments, radialSegments, p, q ) {

		BufferGeometry.call( this );

		this.type = 'TorusKnotBufferGeometry';

		this.parameters = {
			radius: radius,
			tube: tube,
			tubularSegments: tubularSegments,
			radialSegments: radialSegments,
			p: p,
			q: q
		};

		radius = radius || 1;
		tube = tube || 0.4;
		tubularSegments = Math.floor( tubularSegments ) || 64;
		radialSegments = Math.floor( radialSegments ) || 8;
		p = p || 2;
		q = q || 3;

		// buffers

		var indices = [];
		var vertices = [];
		var normals = [];
		var uvs = [];

		// helper variables

		var i, j;

		var vertex = new Vector3();
		var normal = new Vector3();

		var P1 = new Vector3();
		var P2 = new Vector3();

		var B = new Vector3();
		var T = new Vector3();
		var N = new Vector3();

		// generate vertices, normals and uvs

		for ( i = 0; i <= tubularSegments; ++ i ) {

			// the radian "u" is used to calculate the position on the torus curve of the current tubular segement

			var 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 ( 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.

				var v = j / radialSegments * Math.PI * 2;
				var cx = - tube * Math.cos( v );
				var cy = tube * Math.sin( v );

				// now calculate the final vertex position.
				// first we orient the extrusion with our basis vectos, 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 ( j = 1; j <= tubularSegments; j ++ ) {

			for ( i = 1; i <= radialSegments; i ++ ) {

				// indices

				var a = ( radialSegments + 1 ) * ( j - 1 ) + ( i - 1 );
				var b = ( radialSegments + 1 ) * j + ( i - 1 );
				var c = ( radialSegments + 1 ) * j + i;
				var 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 ) {

			var cu = Math.cos( u );
			var su = Math.sin( u );
			var quOverP = q / p * u;
			var 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;

		}

	}

	TorusKnotBufferGeometry.prototype = Object.create( BufferGeometry.prototype );
	TorusKnotBufferGeometry.prototype.constructor = TorusKnotBufferGeometry;

	/**
	 * @author oosmoxiecode
	 * @author mrdoob / http://mrdoob.com/
	 * @author Mugen87 / https://github.com/Mugen87
	 */

	// TorusGeometry

	function TorusGeometry( radius, tube, radialSegments, tubularSegments, arc ) {

		Geometry.call( this );

		this.type = 'TorusGeometry';

		this.parameters = {
			radius: radius,
			tube: tube,
			radialSegments: radialSegments,
			tubularSegments: tubularSegments,
			arc: arc
		};

		this.fromBufferGeometry( new TorusBufferGeometry( radius, tube, radialSegments, tubularSegments, arc ) );
		this.mergeVertices();

	}

	TorusGeometry.prototype = Object.create( Geometry.prototype );
	TorusGeometry.prototype.constructor = TorusGeometry;

	// TorusBufferGeometry

	function TorusBufferGeometry( radius, tube, radialSegments, tubularSegments, arc ) {

		BufferGeometry.call( this );

		this.type = 'TorusBufferGeometry';

		this.parameters = {
			radius: radius,
			tube: tube,
			radialSegments: radialSegments,
			tubularSegments: tubularSegments,
			arc: arc
		};

		radius = radius || 1;
		tube = tube || 0.4;
		radialSegments = Math.floor( radialSegments ) || 8;
		tubularSegments = Math.floor( tubularSegments ) || 6;
		arc = arc || Math.PI * 2;

		// buffers

		var indices = [];
		var vertices = [];
		var normals = [];
		var uvs = [];

		// helper variables

		var center = new Vector3();
		var vertex = new Vector3();
		var normal = new Vector3();

		var j, i;

		// generate vertices, normals and uvs

		for ( j = 0; j <= radialSegments; j ++ ) {

			for ( i = 0; i <= tubularSegments; i ++ ) {

				var u = i / tubularSegments * arc;
				var 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 ( j = 1; j <= radialSegments; j ++ ) {

			for ( i = 1; i <= tubularSegments; i ++ ) {

				// indices

				var a = ( tubularSegments + 1 ) * j + i - 1;
				var b = ( tubularSegments + 1 ) * ( j - 1 ) + i - 1;
				var c = ( tubularSegments + 1 ) * ( j - 1 ) + i;
				var 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 ) );

	}

	TorusBufferGeometry.prototype = Object.create( BufferGeometry.prototype );
	TorusBufferGeometry.prototype.constructor = TorusBufferGeometry;

	/**
	 * @author Mugen87 / https://github.com/Mugen87
	 * Port from https://github.com/mapbox/earcut (v2.1.5)
	 */

	var Earcut = {

		triangulate: function ( data, holeIndices, dim ) {

			dim = dim || 2;

			var hasHoles = holeIndices && holeIndices.length,
				outerLen = hasHoles ? holeIndices[ 0 ] * dim : data.length,
				outerNode = linkedList( data, 0, outerLen, dim, true ),
				triangles = [];

			if ( ! outerNode || outerNode.next === outerNode.prev ) { return triangles; }

			var 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 ( var 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 ? 1 / invSize : 0;

			}

			earcutLinked( outerNode, triangles, dim, minX, minY, invSize );

			return triangles;

		}

	};

	// create a circular doubly linked list from polygon points in the specified winding order
	function linkedList( data, start, end, dim, clockwise ) {

		var 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( 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; }

		var p = start,
			again;
		do {

			again = false;

			if ( ! p.steiner && ( equals( 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 ); }

		var 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 );
				triangles.push( ear.i / dim );
				triangles.push( next.i / dim );

				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( 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 ) {

		var 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
		var p = ear.next.next;

		while ( p !== ear.prev ) {

			if ( pointInTriangle( a.x, a.y, b.x, b.y, c.x, c.y, p.x, p.y ) &&
				area( p.prev, p, p.next ) >= 0 ) { return false; }
			p = p.next;

		}

		return true;

	}

	function isEarHashed( ear, minX, minY, invSize ) {

		var a = ear.prev,
			b = ear,
			c = ear.next;

		if ( area( a, b, c ) >= 0 ) { return false; } // reflex, can't be an ear

		// triangle bbox; min & max are calculated like this for speed
		var minTX = a.x < b.x ? ( a.x < c.x ? a.x : c.x ) : ( b.x < c.x ? b.x : c.x ),
			minTY = a.y < b.y ? ( a.y < c.y ? a.y : c.y ) : ( b.y < c.y ? b.y : c.y ),
			maxTX = a.x > b.x ? ( a.x > c.x ? a.x : c.x ) : ( b.x > c.x ? b.x : c.x ),
			maxTY = a.y > b.y ? ( a.y > c.y ? a.y : c.y ) : ( b.y > c.y ? b.y : c.y );

		// z-order range for the current triangle bbox;
		var minZ = zOrder( minTX, minTY, minX, minY, invSize ),
			maxZ = zOrder( maxTX, maxTY, minX, minY, invSize );

		var 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 !== ear.prev && p !== ear.next &&
				pointInTriangle( a.x, a.y, b.x, b.y, c.x, c.y, p.x, p.y ) &&
				area( p.prev, p, p.next ) >= 0 ) { return false; }
			p = p.prevZ;

			if ( n !== ear.prev && n !== ear.next &&
				pointInTriangle( a.x, a.y, b.x, b.y, c.x, c.y, 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 !== ear.prev && p !== ear.next &&
				pointInTriangle( a.x, a.y, b.x, b.y, c.x, c.y, 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 !== ear.prev && n !== ear.next &&
				pointInTriangle( a.x, a.y, b.x, b.y, c.x, c.y, 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 ) {

		var p = start;
		do {

			var a = p.prev,
				b = p.next.next;

			if ( ! equals( a, b ) && intersects( a, p, p.next, b ) && locallyInside( a, b ) && locallyInside( b, a ) ) {

				triangles.push( a.i / dim );
				triangles.push( p.i / dim );
				triangles.push( b.i / dim );

				// remove two nodes involved
				removeNode( p );
				removeNode( p.next );

				p = start = b;

			}

			p = p.next;

		} while ( p !== start );

		return 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
		var a = start;
		do {

			var b = a.next.next;
			while ( b !== a.prev ) {

				if ( a.i !== b.i && isValidDiagonal( a, b ) ) {

					// split the polygon in two by the diagonal
					var 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 );
					earcutLinked( c, triangles, dim, minX, minY, invSize );
					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 ) {

		var queue = [],
			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 ++ ) {

			eliminateHole( queue[ i ], outerNode );
			outerNode = filterPoints( outerNode, outerNode.next );

		}

		return outerNode;

	}

	function compareX( a, b ) {

		return a.x - b.x;

	}

	// find a bridge between vertices that connects hole with an outer ring and and link it
	function eliminateHole( hole, outerNode ) {

		outerNode = findHoleBridge( hole, outerNode );
		if ( outerNode ) {

			var b = splitPolygon( outerNode, hole );
			filterPoints( b, b.next );

		}

	}

	// David Eberly's algorithm for finding a bridge between hole and outer polygon
	function findHoleBridge( hole, outerNode ) {

		var p = outerNode,
			hx = hole.x,
			hy = hole.y,
			qx = - Infinity,
			m;

		// 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 ) {

				var x = p.x + ( hy - p.y ) * ( p.next.x - p.x ) / ( p.next.y - p.y );
				if ( x <= hx && x > qx ) {

					qx = x;
					if ( x === hx ) {

						if ( hy === p.y ) { return p; }
						if ( hy === p.next.y ) { return p.next; }

					}

					m = p.x < p.next.x ? p : p.next;

				}

			}

			p = p.next;

		} while ( p !== outerNode );

		if ( ! m ) { return null; }

		if ( hx === qx ) { return m.prev; } // hole touches outer segment; pick lower endpoint

		// 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

		var stop = m,
			mx = m.x,
			my = m.y,
			tanMin = Infinity,
			tan;

		p = m.next;

		while ( p !== stop ) {

			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 ( ( tan < tanMin || ( tan === tanMin && p.x > m.x ) ) && locallyInside( p, hole ) ) {

					m = p;
					tanMin = tan;

				}

			}

			p = p.next;

		}

		return m;

	}

	// interlink polygon nodes in z-order
	function indexCurve( start, minX, minY, invSize ) {

		var p = start;
		do {

			if ( p.z === null ) { 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 ) {

		var 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 = 32767 * ( x - minX ) * invSize;
		y = 32767 * ( y - minY ) * invSize;

		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 ) {

		var 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 ) >= 0 &&
			   ( ax - px ) * ( by - py ) - ( bx - px ) * ( ay - py ) >= 0 &&
			   ( bx - px ) * ( cy - py ) - ( cx - px ) * ( by - py ) >= 0;

	}

	// 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 ) &&
			   locallyInside( a, b ) && locallyInside( b, a ) && middleInside( a, b );

	}

	// 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( p1, p2 ) {

		return p1.x === p2.x && p1.y === p2.y;

	}

	// check if two segments intersect
	function intersects( p1, q1, p2, q2 ) {

		if ( ( equals( p1, p2 ) && equals( q1, q2 ) ) ||
			( equals( p1, q2 ) && equals( p2, q1 ) ) ) { return true; }
		return area( p1, q1, p2 ) > 0 !== area( p1, q1, q2 ) > 0 &&
			   area( p2, q2, p1 ) > 0 !== area( p2, q2, q1 ) > 0;

	}

	// check if a polygon diagonal intersects any polygon segments
	function intersectsPolygon( a, b ) {

		var 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 ) {

		var p = a,
			inside = false,
			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 ) {

		var a2 = new Node( a.i, a.x, a.y ),
			b2 = new Node( 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 ) {

		var p = new Node( 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( 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 = null;

		// 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 ) {

		var sum = 0;
		for ( var i = start, j = end - dim; i < end; i += dim ) {

			sum += ( data[ j ] - data[ i ] ) * ( data[ i + 1 ] + data[ j + 1 ] );
			j = i;

		}

		return sum;

	}

	/**
	 * @author zz85 / http://www.lab4games.net/zz85/blog
	 */

	var ShapeUtils = {

		// calculate area of the contour polygon

		area: function ( contour ) {

			var n = contour.length;
			var a = 0.0;

			for ( var 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;

		},

		isClockWise: function ( pts ) {

			return ShapeUtils.area( pts ) < 0;

		},

		triangulateShape: function ( contour, holes ) {

			var vertices = []; // flat array of vertices like [ x0,y0, x1,y1, x2,y2, ... ]
			var holeIndices = []; // array of hole indices
			var faces = []; // final array of vertex indices like [ [ a,b,d ], [ b,c,d ] ]

			removeDupEndPts( contour );
			addContour( vertices, contour );

			//

			var holeIndex = contour.length;

			holes.forEach( removeDupEndPts );

			for ( var i = 0; i < holes.length; i ++ ) {

				holeIndices.push( holeIndex );
				holeIndex += holes[ i ].length;
				addContour( vertices, holes[ i ] );

			}

			//

			var triangles = Earcut.triangulate( vertices, holeIndices );

			//

			for ( var i = 0; i < triangles.length; i += 3 ) {

				faces.push( triangles.slice( i, i + 3 ) );

			}

			return faces;

		}

	};

	function removeDupEndPts( points ) {

		var l = points.length;

		if ( l > 2 && points[ l - 1 ].equals( points[ 0 ] ) ) {

			points.pop();

		}

	}

	function addContour( vertices, contour ) {

		for ( var i = 0; i < contour.length; i ++ ) {

			vertices.push( contour[ i ].x );
			vertices.push( contour[ i ].y );

		}

	}

	/**
	 * @author zz85 / http://www.lab4games.net/zz85/blog
	 *
	 * 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
	 *
	 * }
	 */

	// ExtrudeGeometry

	function ExtrudeGeometry( shapes, options ) {

		Geometry.call( this );

		this.type = 'ExtrudeGeometry';

		this.parameters = {
			shapes: shapes,
			options: options
		};

		this.fromBufferGeometry( new ExtrudeBufferGeometry( shapes, options ) );
		this.mergeVertices();

	}

	ExtrudeGeometry.prototype = Object.create( Geometry.prototype );
	ExtrudeGeometry.prototype.constructor = ExtrudeGeometry;

	ExtrudeGeometry.prototype.toJSON = function () {

		var data = Geometry.prototype.toJSON.call( this );

		var shapes = this.parameters.shapes;
		var options = this.parameters.options;

		return toJSON( shapes, options, data );

	};

	// ExtrudeBufferGeometry

	function ExtrudeBufferGeometry( shapes, options ) {

		BufferGeometry.call( this );

		this.type = 'ExtrudeBufferGeometry';

		this.parameters = {
			shapes: shapes,
			options: options
		};

		shapes = Array.isArray( shapes ) ? shapes : [ shapes ];

		var scope = this;

		var verticesArray = [];
		var uvArray = [];

		for ( var i = 0, l = shapes.length; i < l; i ++ ) {

			var 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 ) {

			var placeholder = [];

			// options

			var curveSegments = options.curveSegments !== undefined ? options.curveSegments : 12;
			var steps = options.steps !== undefined ? options.steps : 1;
			var depth = options.depth !== undefined ? options.depth : 100;

			var bevelEnabled = options.bevelEnabled !== undefined ? options.bevelEnabled : true;
			var bevelThickness = options.bevelThickness !== undefined ? options.bevelThickness : 6;
			var bevelSize = options.bevelSize !== undefined ? options.bevelSize : bevelThickness - 2;
			var bevelOffset = options.bevelOffset !== undefined ? options.bevelOffset : 0;
			var bevelSegments = options.bevelSegments !== undefined ? options.bevelSegments : 3;

			var extrudePath = options.extrudePath;

			var uvgen = options.UVGenerator !== undefined ? options.UVGenerator : WorldUVGenerator;

			// deprecated options

			if ( options.amount !== undefined ) {

				console.warn( 'THREE.ExtrudeBufferGeometry: amount has been renamed to depth.' );
				depth = options.amount;

			}

			//

			var extrudePts, extrudeByPath = false;
			var 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

			var ahole, h, hl; // looping of holes

			var shapePoints = shape.extractPoints( curveSegments );

			var vertices = shapePoints.shape;
			var holes = shapePoints.holes;

			var 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 ( h = 0, hl = holes.length; h < hl; h ++ ) {

					ahole = holes[ h ];

					if ( ShapeUtils.isClockWise( ahole ) ) {

						holes[ h ] = ahole.reverse();

					}

				}

			}


			var faces = ShapeUtils.triangulateShape( vertices, holes );

			/* Vertices */

			var contour = vertices; // vertices has all points but contour has only points of circumference

			for ( h = 0, hl = holes.length; h < hl; h ++ ) {

				ahole = holes[ h ];

				vertices = vertices.concat( ahole );

			}


			function scalePt2( pt, vec, size ) {

				if ( ! vec ) { console.error( "THREE.ExtrudeGeometry: vec does not exist" ); }

				return vec.clone().multiplyScalar( size ).add( pt );

			}

			var b, bs, t, z,
				vert, vlen = vertices.length,
				face, 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.

				var 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

				var v_prev_x = inPt.x - inPrev.x,
					v_prev_y = inPt.y - inPrev.y;
				var v_next_x = inNext.x - inPt.x,
					v_next_y = inNext.y - inPt.y;

				var v_prev_lensq = ( v_prev_x * v_prev_x + v_prev_y * v_prev_y );

				// check for collinear edges
				var 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

					var v_prev_len = Math.sqrt( v_prev_lensq );
					var 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

					var ptPrevShift_x = ( inPrev.x - v_prev_y / v_prev_len );
					var ptPrevShift_y = ( inPrev.y + v_prev_x / v_prev_len );

					var ptNextShift_x = ( inNext.x - v_next_y / v_next_len );
					var ptNextShift_y = ( inNext.y + v_next_x / v_next_len );

					// scaling factor for v_prev to intersection point

					var 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
					var 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

					var 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 );

			}


			var contourMovements = [];

			for ( var 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 ] );

			}

			var holesMovements = [],
				oneHoleMovements, verticesMovements = contourMovements.concat();

			for ( h = 0, hl = holes.length; h < hl; h ++ ) {

				ahole = holes[ h ];

				oneHoleMovements = [];

				for ( 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 ( b = 0; b < bevelSegments; b ++ ) {

				//for ( b = bevelSegments; b > 0; b -- ) {

				t = b / bevelSegments;
				z = bevelThickness * Math.cos( t * Math.PI / 2 );
				bs = bevelSize * Math.sin( t * Math.PI / 2 ) + bevelOffset;

				// contract shape

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

					vert = scalePt2( contour[ i ], contourMovements[ i ], bs );

					v( vert.x, vert.y, - z );

				}

				// expand holes

				for ( h = 0, hl = holes.length; h < hl; h ++ ) {

					ahole = holes[ h ];
					oneHoleMovements = holesMovements[ h ];

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

						vert = scalePt2( ahole[ i ], oneHoleMovements[ i ], bs );

						v( vert.x, vert.y, - z );

					}

				}

			}

			bs = bevelSize + bevelOffset;

			// Back facing vertices

			for ( i = 0; i < vlen; i ++ ) {

				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

			var s;

			for ( s = 1; s <= steps; s ++ ) {

				for ( i = 0; i < vlen; i ++ ) {

					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 ( b = bevelSegments - 1; b >= 0; b -- ) {

				t = b / bevelSegments;
				z = bevelThickness * Math.cos( t * Math.PI / 2 );
				bs = bevelSize * Math.sin( t * Math.PI / 2 ) + bevelOffset;

				// contract shape

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

					vert = scalePt2( contour[ i ], contourMovements[ i ], bs );
					v( vert.x, vert.y, depth + z );

				}

				// expand holes

				for ( h = 0, hl = holes.length; h < hl; h ++ ) {

					ahole = holes[ h ];
					oneHoleMovements = holesMovements[ h ];

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

						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() {

				var start = verticesArray.length / 3;

				if ( bevelEnabled ) {

					var layer = 0; // steps + 1
					var offset = vlen * layer;

					// Bottom faces

					for ( i = 0; i < flen; i ++ ) {

						face = faces[ i ];
						f3( face[ 2 ] + offset, face[ 1 ] + offset, face[ 0 ] + offset );

					}

					layer = steps + bevelSegments * 2;
					offset = vlen * layer;

					// Top faces

					for ( i = 0; i < flen; i ++ ) {

						face = faces[ i ];
						f3( face[ 0 ] + offset, face[ 1 ] + offset, face[ 2 ] + offset );

					}

				} else {

					// Bottom faces

					for ( i = 0; i < flen; i ++ ) {

						face = faces[ i ];
						f3( face[ 2 ], face[ 1 ], face[ 0 ] );

					}

					// Top faces

					for ( i = 0; i < flen; i ++ ) {

						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() {

				var start = verticesArray.length / 3;
				var layeroffset = 0;
				sidewalls( contour, layeroffset );
				layeroffset += contour.length;

				for ( h = 0, hl = holes.length; h < hl; h ++ ) {

					ahole = holes[ h ];
					sidewalls( ahole, layeroffset );

					//, true
					layeroffset += ahole.length;

				}


				scope.addGroup( start, verticesArray.length / 3 - start, 1 );


			}

			function sidewalls( contour, layeroffset ) {

				var j, k;
				i = contour.length;

				while ( -- i >= 0 ) {

					j = i;
					k = i - 1;
					if ( k < 0 ) { k = contour.length - 1; }

					//console.log('b', i,j, i-1, k,vertices.length);

					var s = 0,
						sl = steps + bevelSegments * 2;

					for ( s = 0; s < sl; s ++ ) {

						var slen1 = vlen * s;
						var slen2 = vlen * ( s + 1 );

						var 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 );

				var nextIndex = verticesArray.length / 3;
				var 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 );


				var nextIndex = verticesArray.length / 3;
				var 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 );

			}

		}

	}

	ExtrudeBufferGeometry.prototype = Object.create( BufferGeometry.prototype );
	ExtrudeBufferGeometry.prototype.constructor = ExtrudeBufferGeometry;

	ExtrudeBufferGeometry.prototype.toJSON = function () {

		var data = BufferGeometry.prototype.toJSON.call( this );

		var shapes = this.parameters.shapes;
		var options = this.parameters.options;

		return toJSON( shapes, options, data );

	};

	//

	var WorldUVGenerator = {

		generateTopUV: function ( geometry, vertices, indexA, indexB, indexC ) {

			var a_x = vertices[ indexA * 3 ];
			var a_y = vertices[ indexA * 3 + 1 ];
			var b_x = vertices[ indexB * 3 ];
			var b_y = vertices[ indexB * 3 + 1 ];
			var c_x = vertices[ indexC * 3 ];
			var 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 ) {

			var a_x = vertices[ indexA * 3 ];
			var a_y = vertices[ indexA * 3 + 1 ];
			var a_z = vertices[ indexA * 3 + 2 ];
			var b_x = vertices[ indexB * 3 ];
			var b_y = vertices[ indexB * 3 + 1 ];
			var b_z = vertices[ indexB * 3 + 2 ];
			var c_x = vertices[ indexC * 3 ];
			var c_y = vertices[ indexC * 3 + 1 ];
			var c_z = vertices[ indexC * 3 + 2 ];
			var d_x = vertices[ indexD * 3 ];
			var d_y = vertices[ indexD * 3 + 1 ];
			var d_z = vertices[ indexD * 3 + 2 ];

			if ( Math.abs( a_y - b_y ) < 0.01 ) {

				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( shapes, options, data ) {

		//

		data.shapes = [];

		if ( Array.isArray( shapes ) ) {

			for ( var i = 0, l = shapes.length; i < l; i ++ ) {

				var shape = shapes[ i ];

				data.shapes.push( shape.uuid );

			}

		} else {

			data.shapes.push( shapes.uuid );

		}

		//

		if ( options.extrudePath !== undefined ) { data.options.extrudePath = options.extrudePath.toJSON(); }

		return data;

	}

	/**
	 * @author zz85 / http://www.lab4games.net/zz85/blog
	 * @author alteredq / http://alteredqualia.com/
	 *
	 * Text = 3D Text
	 *
	 * parameters = {
	 *  font: <THREE.Font>, // font
	 *
	 *  size: <float>, // size of the text
	 *  height: <float>, // thickness to extrude text
	 *  curveSegments: <int>, // number of points on the curves
	 *
	 *  bevelEnabled: <bool>, // turn on bevel
	 *  bevelThickness: <float>, // how deep into text bevel goes
	 *  bevelSize: <float>, // how far from text outline (including bevelOffset) is bevel
	 *  bevelOffset: <float> // how far from text outline does bevel start
	 * }
	 */

	// TextGeometry

	function TextGeometry( text, parameters ) {

		Geometry.call( this );

		this.type = 'TextGeometry';

		this.parameters = {
			text: text,
			parameters: parameters
		};

		this.fromBufferGeometry( new TextBufferGeometry( text, parameters ) );
		this.mergeVertices();

	}

	TextGeometry.prototype = Object.create( Geometry.prototype );
	TextGeometry.prototype.constructor = TextGeometry;

	// TextBufferGeometry

	function TextBufferGeometry( text, parameters ) {

		parameters = parameters || {};

		var font = parameters.font;

		if ( ! ( font && font.isFont ) ) {

			console.error( 'THREE.TextGeometry: font parameter is not an instance of THREE.Font.' );
			return new Geometry();

		}

		var shapes = font.generateShapes( text, parameters.size );

		// translate parameters to ExtrudeGeometry API

		parameters.depth = parameters.height !== undefined ? parameters.height : 50;

		// defaults

		if ( parameters.bevelThickness === undefined ) { parameters.bevelThickness = 10; }
		if ( parameters.bevelSize === undefined ) { parameters.bevelSize = 8; }
		if ( parameters.bevelEnabled === undefined ) { parameters.bevelEnabled = false; }

		ExtrudeBufferGeometry.call( this, shapes, parameters );

		this.type = 'TextBufferGeometry';

	}

	TextBufferGeometry.prototype = Object.create( ExtrudeBufferGeometry.prototype );
	TextBufferGeometry.prototype.constructor = TextBufferGeometry;

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author benaadams / https://twitter.com/ben_a_adams
	 * @author Mugen87 / https://github.com/Mugen87
	 */

	// SphereGeometry

	function SphereGeometry( radius, widthSegments, heightSegments, phiStart, phiLength, thetaStart, thetaLength ) {

		Geometry.call( this );

		this.type = 'SphereGeometry';

		this.parameters = {
			radius: radius,
			widthSegments: widthSegments,
			heightSegments: heightSegments,
			phiStart: phiStart,
			phiLength: phiLength,
			thetaStart: thetaStart,
			thetaLength: thetaLength
		};

		this.fromBufferGeometry( new SphereBufferGeometry( radius, widthSegments, heightSegments, phiStart, phiLength, thetaStart, thetaLength ) );
		this.mergeVertices();

	}

	SphereGeometry.prototype = Object.create( Geometry.prototype );
	SphereGeometry.prototype.constructor = SphereGeometry;

	// SphereBufferGeometry

	function SphereBufferGeometry( radius, widthSegments, heightSegments, phiStart, phiLength, thetaStart, thetaLength ) {

		BufferGeometry.call( this );

		this.type = 'SphereBufferGeometry';

		this.parameters = {
			radius: radius,
			widthSegments: widthSegments,
			heightSegments: heightSegments,
			phiStart: phiStart,
			phiLength: phiLength,
			thetaStart: thetaStart,
			thetaLength: thetaLength
		};

		radius = radius || 1;

		widthSegments = Math.max( 3, Math.floor( widthSegments ) || 8 );
		heightSegments = Math.max( 2, Math.floor( heightSegments ) || 6 );

		phiStart = phiStart !== undefined ? phiStart : 0;
		phiLength = phiLength !== undefined ? phiLength : Math.PI * 2;

		thetaStart = thetaStart !== undefined ? thetaStart : 0;
		thetaLength = thetaLength !== undefined ? thetaLength : Math.PI;

		var thetaEnd = Math.min( thetaStart + thetaLength, Math.PI );

		var ix, iy;

		var index = 0;
		var grid = [];

		var vertex = new Vector3();
		var normal = new Vector3();

		// buffers

		var indices = [];
		var vertices = [];
		var normals = [];
		var uvs = [];

		// generate vertices, normals and uvs

		for ( iy = 0; iy <= heightSegments; iy ++ ) {

			var verticesRow = [];

			var v = iy / heightSegments;

			// special case for the poles

			var uOffset = 0;

			if ( iy == 0 && thetaStart == 0 ) {

				uOffset = 0.5 / widthSegments;

			} else if ( iy == heightSegments && thetaEnd == Math.PI ) {

				uOffset = - 0.5 / widthSegments;

			}

			for ( ix = 0; ix <= widthSegments; ix ++ ) {

				var 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 ( iy = 0; iy < heightSegments; iy ++ ) {

			for ( ix = 0; ix < widthSegments; ix ++ ) {

				var a = grid[ iy ][ ix + 1 ];
				var b = grid[ iy ][ ix ];
				var c = grid[ iy + 1 ][ ix ];
				var 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 ) );

	}

	SphereBufferGeometry.prototype = Object.create( BufferGeometry.prototype );
	SphereBufferGeometry.prototype.constructor = SphereBufferGeometry;

	/**
	 * @author Kaleb Murphy
	 * @author Mugen87 / https://github.com/Mugen87
	 */

	// RingGeometry

	function RingGeometry( innerRadius, outerRadius, thetaSegments, phiSegments, thetaStart, thetaLength ) {

		Geometry.call( this );

		this.type = 'RingGeometry';

		this.parameters = {
			innerRadius: innerRadius,
			outerRadius: outerRadius,
			thetaSegments: thetaSegments,
			phiSegments: phiSegments,
			thetaStart: thetaStart,
			thetaLength: thetaLength
		};

		this.fromBufferGeometry( new RingBufferGeometry( innerRadius, outerRadius, thetaSegments, phiSegments, thetaStart, thetaLength ) );
		this.mergeVertices();

	}

	RingGeometry.prototype = Object.create( Geometry.prototype );
	RingGeometry.prototype.constructor = RingGeometry;

	// RingBufferGeometry

	function RingBufferGeometry( innerRadius, outerRadius, thetaSegments, phiSegments, thetaStart, thetaLength ) {

		BufferGeometry.call( this );

		this.type = 'RingBufferGeometry';

		this.parameters = {
			innerRadius: innerRadius,
			outerRadius: outerRadius,
			thetaSegments: thetaSegments,
			phiSegments: phiSegments,
			thetaStart: thetaStart,
			thetaLength: thetaLength
		};

		innerRadius = innerRadius || 0.5;
		outerRadius = outerRadius || 1;

		thetaStart = thetaStart !== undefined ? thetaStart : 0;
		thetaLength = thetaLength !== undefined ? thetaLength : Math.PI * 2;

		thetaSegments = thetaSegments !== undefined ? Math.max( 3, thetaSegments ) : 8;
		phiSegments = phiSegments !== undefined ? Math.max( 1, phiSegments ) : 1;

		// buffers

		var indices = [];
		var vertices = [];
		var normals = [];
		var uvs = [];

		// some helper variables

		var segment;
		var radius = innerRadius;
		var radiusStep = ( ( outerRadius - innerRadius ) / phiSegments );
		var vertex = new Vector3();
		var uv = new Vector2();
		var j, i;

		// generate vertices, normals and uvs

		for ( j = 0; j <= phiSegments; j ++ ) {

			for ( i = 0; i <= thetaSegments; i ++ ) {

				// values are generate from the inside of the ring to the outside

				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 ( j = 0; j < phiSegments; j ++ ) {

			var thetaSegmentLevel = j * ( thetaSegments + 1 );

			for ( i = 0; i < thetaSegments; i ++ ) {

				segment = i + thetaSegmentLevel;

				var a = segment;
				var b = segment + thetaSegments + 1;
				var c = segment + thetaSegments + 2;
				var 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 ) );

	}

	RingBufferGeometry.prototype = Object.create( BufferGeometry.prototype );
	RingBufferGeometry.prototype.constructor = RingBufferGeometry;

	/**
	 * @author zz85 / https://github.com/zz85
	 * @author bhouston / http://clara.io
	 * @author Mugen87 / https://github.com/Mugen87
	 */

	// LatheGeometry

	function LatheGeometry( points, segments, phiStart, phiLength ) {

		Geometry.call( this );

		this.type = 'LatheGeometry';

		this.parameters = {
			points: points,
			segments: segments,
			phiStart: phiStart,
			phiLength: phiLength
		};

		this.fromBufferGeometry( new LatheBufferGeometry( points, segments, phiStart, phiLength ) );
		this.mergeVertices();

	}

	LatheGeometry.prototype = Object.create( Geometry.prototype );
	LatheGeometry.prototype.constructor = LatheGeometry;

	// LatheBufferGeometry

	function LatheBufferGeometry( points, segments, phiStart, phiLength ) {

		BufferGeometry.call( this );

		this.type = 'LatheBufferGeometry';

		this.parameters = {
			points: points,
			segments: segments,
			phiStart: phiStart,
			phiLength: phiLength
		};

		segments = Math.floor( segments ) || 12;
		phiStart = phiStart || 0;
		phiLength = phiLength || Math.PI * 2;

		// clamp phiLength so it's in range of [ 0, 2PI ]

		phiLength = MathUtils.clamp( phiLength, 0, Math.PI * 2 );


		// buffers

		var indices = [];
		var vertices = [];
		var uvs = [];

		// helper variables

		var base;
		var inverseSegments = 1.0 / segments;
		var vertex = new Vector3();
		var uv = new Vector2();
		var i, j;

		// generate vertices and uvs

		for ( i = 0; i <= segments; i ++ ) {

			var phi = phiStart + i * inverseSegments * phiLength;

			var sin = Math.sin( phi );
			var cos = Math.cos( phi );

			for ( 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 );


			}

		}

		// indices

		for ( i = 0; i < segments; i ++ ) {

			for ( j = 0; j < ( points.length - 1 ); j ++ ) {

				base = j + i * points.length;

				var a = base;
				var b = base + points.length;
				var c = base + points.length + 1;
				var d = base + 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( 'uv', new Float32BufferAttribute( uvs, 2 ) );

		// generate normals

		this.computeVertexNormals();

		// if the geometry is closed, we need to average the normals along the seam.
		// because the corresponding vertices are identical (but still have different UVs).

		if ( phiLength === Math.PI * 2 ) {

			var normals = this.attributes.normal.array;
			var n1 = new Vector3();
			var n2 = new Vector3();
			var n = new Vector3();

			// this is the buffer offset for the last line of vertices

			base = segments * points.length * 3;

			for ( i = 0, j = 0; i < points.length; i ++, j += 3 ) {

				// select the normal of the vertex in the first line

				n1.x = normals[ j + 0 ];
				n1.y = normals[ j + 1 ];
				n1.z = normals[ j + 2 ];

				// select the normal of the vertex in the last line

				n2.x = normals[ base + j + 0 ];
				n2.y = normals[ base + j + 1 ];
				n2.z = normals[ base + j + 2 ];

				// average normals

				n.addVectors( n1, n2 ).normalize();

				// assign the new values to both normals

				normals[ j + 0 ] = normals[ base + j + 0 ] = n.x;
				normals[ j + 1 ] = normals[ base + j + 1 ] = n.y;
				normals[ j + 2 ] = normals[ base + j + 2 ] = n.z;

			}

		}

	}

	LatheBufferGeometry.prototype = Object.create( BufferGeometry.prototype );
	LatheBufferGeometry.prototype.constructor = LatheBufferGeometry;

	/**
	 * @author jonobr1 / http://jonobr1.com
	 * @author Mugen87 / https://github.com/Mugen87
	 */

	// ShapeGeometry

	function ShapeGeometry( shapes, curveSegments ) {

		Geometry.call( this );

		this.type = 'ShapeGeometry';

		if ( typeof curveSegments === 'object' ) {

			console.warn( 'THREE.ShapeGeometry: Options parameter has been removed.' );

			curveSegments = curveSegments.curveSegments;

		}

		this.parameters = {
			shapes: shapes,
			curveSegments: curveSegments
		};

		this.fromBufferGeometry( new ShapeBufferGeometry( shapes, curveSegments ) );
		this.mergeVertices();

	}

	ShapeGeometry.prototype = Object.create( Geometry.prototype );
	ShapeGeometry.prototype.constructor = ShapeGeometry;

	ShapeGeometry.prototype.toJSON = function () {

		var data = Geometry.prototype.toJSON.call( this );

		var shapes = this.parameters.shapes;

		return toJSON$1( shapes, data );

	};

	// ShapeBufferGeometry

	function ShapeBufferGeometry( shapes, curveSegments ) {

		BufferGeometry.call( this );

		this.type = 'ShapeBufferGeometry';

		this.parameters = {
			shapes: shapes,
			curveSegments: curveSegments
		};

		curveSegments = curveSegments || 12;

		// buffers

		var indices = [];
		var vertices = [];
		var normals = [];
		var uvs = [];

		// helper variables

		var groupStart = 0;
		var groupCount = 0;

		// allow single and array values for "shapes" parameter

		if ( Array.isArray( shapes ) === false ) {

			addShape( shapes );

		} else {

			for ( var 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 ) {

			var i, l, shapeHole;

			var indexOffset = vertices.length / 3;
			var points = shape.extractPoints( curveSegments );

			var shapeVertices = points.shape;
			var shapeHoles = points.holes;

			// check direction of vertices

			if ( ShapeUtils.isClockWise( shapeVertices ) === false ) {

				shapeVertices = shapeVertices.reverse();

			}

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

				shapeHole = shapeHoles[ i ];

				if ( ShapeUtils.isClockWise( shapeHole ) === true ) {

					shapeHoles[ i ] = shapeHole.reverse();

				}

			}

			var faces = ShapeUtils.triangulateShape( shapeVertices, shapeHoles );

			// join vertices of inner and outer paths to a single array

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

				shapeHole = shapeHoles[ i ];
				shapeVertices = shapeVertices.concat( shapeHole );

			}

			// vertices, normals, uvs

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

				var vertex = shapeVertices[ i ];

				vertices.push( vertex.x, vertex.y, 0 );
				normals.push( 0, 0, 1 );
				uvs.push( vertex.x, vertex.y ); // world uvs

			}

			// incides

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

				var face = faces[ i ];

				var a = face[ 0 ] + indexOffset;
				var b = face[ 1 ] + indexOffset;
				var c = face[ 2 ] + indexOffset;

				indices.push( a, b, c );
				groupCount += 3;

			}

		}

	}

	ShapeBufferGeometry.prototype = Object.create( BufferGeometry.prototype );
	ShapeBufferGeometry.prototype.constructor = ShapeBufferGeometry;

	ShapeBufferGeometry.prototype.toJSON = function () {

		var data = BufferGeometry.prototype.toJSON.call( this );

		var shapes = this.parameters.shapes;

		return toJSON$1( shapes, data );

	};

	//

	function toJSON$1( shapes, data ) {

		data.shapes = [];

		if ( Array.isArray( shapes ) ) {

			for ( var i = 0, l = shapes.length; i < l; i ++ ) {

				var shape = shapes[ i ];

				data.shapes.push( shape.uuid );

			}

		} else {

			data.shapes.push( shapes.uuid );

		}

		return data;

	}

	/**
	 * @author WestLangley / http://github.com/WestLangley
	 * @author Mugen87 / https://github.com/Mugen87
	 */

	function EdgesGeometry( geometry, thresholdAngle ) {

		BufferGeometry.call( this );

		this.type = 'EdgesGeometry';

		this.parameters = {
			thresholdAngle: thresholdAngle
		};

		thresholdAngle = ( thresholdAngle !== undefined ) ? thresholdAngle : 1;

		// buffer

		var vertices = [];

		// helper variables

		var thresholdDot = Math.cos( MathUtils.DEG2RAD * thresholdAngle );
		var edge = [ 0, 0 ], edges = {}, edge1, edge2;
		var key, keys = [ 'a', 'b', 'c' ];

		// prepare source geometry

		var geometry2;

		if ( geometry.isBufferGeometry ) {

			geometry2 = new Geometry();
			geometry2.fromBufferGeometry( geometry );

		} else {

			geometry2 = geometry.clone();

		}

		geometry2.mergeVertices();
		geometry2.computeFaceNormals();

		var sourceVertices = geometry2.vertices;
		var faces = geometry2.faces;

		// now create a data structure where each entry represents an edge with its adjoining faces

		for ( var i = 0, l = faces.length; i < l; i ++ ) {

			var face = faces[ i ];

			for ( var j = 0; j < 3; j ++ ) {

				edge1 = face[ keys[ j ] ];
				edge2 = face[ keys[ ( j + 1 ) % 3 ] ];
				edge[ 0 ] = Math.min( edge1, edge2 );
				edge[ 1 ] = Math.max( edge1, edge2 );

				key = edge[ 0 ] + ',' + edge[ 1 ];

				if ( edges[ key ] === undefined ) {

					edges[ key ] = { index1: edge[ 0 ], index2: edge[ 1 ], face1: i, face2: undefined };

				} else {

					edges[ key ].face2 = i;

				}

			}

		}

		// generate vertices

		for ( key in edges ) {

			var e = edges[ key ];

			// an edge is only rendered if the angle (in degrees) between the face normals of the adjoining faces exceeds this value. default = 1 degree.

			if ( e.face2 === undefined || faces[ e.face1 ].normal.dot( faces[ e.face2 ].normal ) <= thresholdDot ) {

				var vertex = sourceVertices[ e.index1 ];
				vertices.push( vertex.x, vertex.y, vertex.z );

				vertex = sourceVertices[ e.index2 ];
				vertices.push( vertex.x, vertex.y, vertex.z );

			}

		}

		// build geometry

		this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );

	}

	EdgesGeometry.prototype = Object.create( BufferGeometry.prototype );
	EdgesGeometry.prototype.constructor = EdgesGeometry;

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author Mugen87 / https://github.com/Mugen87
	 */

	// CylinderGeometry

	function CylinderGeometry( radiusTop, radiusBottom, height, radialSegments, heightSegments, openEnded, thetaStart, thetaLength ) {

		Geometry.call( this );

		this.type = 'CylinderGeometry';

		this.parameters = {
			radiusTop: radiusTop,
			radiusBottom: radiusBottom,
			height: height,
			radialSegments: radialSegments,
			heightSegments: heightSegments,
			openEnded: openEnded,
			thetaStart: thetaStart,
			thetaLength: thetaLength
		};

		this.fromBufferGeometry( new CylinderBufferGeometry( radiusTop, radiusBottom, height, radialSegments, heightSegments, openEnded, thetaStart, thetaLength ) );
		this.mergeVertices();

	}

	CylinderGeometry.prototype = Object.create( Geometry.prototype );
	CylinderGeometry.prototype.constructor = CylinderGeometry;

	// CylinderBufferGeometry

	function CylinderBufferGeometry( radiusTop, radiusBottom, height, radialSegments, heightSegments, openEnded, thetaStart, thetaLength ) {

		BufferGeometry.call( this );

		this.type = 'CylinderBufferGeometry';

		this.parameters = {
			radiusTop: radiusTop,
			radiusBottom: radiusBottom,
			height: height,
			radialSegments: radialSegments,
			heightSegments: heightSegments,
			openEnded: openEnded,
			thetaStart: thetaStart,
			thetaLength: thetaLength
		};

		var scope = this;

		radiusTop = radiusTop !== undefined ? radiusTop : 1;
		radiusBottom = radiusBottom !== undefined ? radiusBottom : 1;
		height = height || 1;

		radialSegments = Math.floor( radialSegments ) || 8;
		heightSegments = Math.floor( heightSegments ) || 1;

		openEnded = openEnded !== undefined ? openEnded : false;
		thetaStart = thetaStart !== undefined ? thetaStart : 0.0;
		thetaLength = thetaLength !== undefined ? thetaLength : Math.PI * 2;

		// buffers

		var indices = [];
		var vertices = [];
		var normals = [];
		var uvs = [];

		// helper variables

		var index = 0;
		var indexArray = [];
		var halfHeight = height / 2;
		var 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() {

			var x, y;
			var normal = new Vector3();
			var vertex = new Vector3();

			var groupCount = 0;

			// this will be used to calculate the normal
			var slope = ( radiusBottom - radiusTop ) / height;

			// generate vertices, normals and uvs

			for ( y = 0; y <= heightSegments; y ++ ) {

				var indexRow = [];

				var v = y / heightSegments;

				// calculate the radius of the current row

				var radius = v * ( radiusBottom - radiusTop ) + radiusTop;

				for ( x = 0; x <= radialSegments; x ++ ) {

					var u = x / radialSegments;

					var theta = u * thetaLength + thetaStart;

					var sinTheta = Math.sin( theta );
					var 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 ( x = 0; x < radialSegments; x ++ ) {

				for ( y = 0; y < heightSegments; y ++ ) {

					// we use the index array to access the correct indices

					var a = indexArray[ y ][ x ];
					var b = indexArray[ y + 1 ][ x ];
					var c = indexArray[ y + 1 ][ x + 1 ];
					var 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 ) {

			var x, centerIndexStart, centerIndexEnd;

			var uv = new Vector2();
			var vertex = new Vector3();

			var groupCount = 0;

			var radius = ( top === true ) ? radiusTop : radiusBottom;
			var sign = ( top === true ) ? 1 : - 1;

			// save the index of the first center vertex
			centerIndexStart = index;

			// 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 ( 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

			centerIndexEnd = index;

			// now we generate the surrounding vertices, normals and uvs

			for ( x = 0; x <= radialSegments; x ++ ) {

				var u = x / radialSegments;
				var theta = u * thetaLength + thetaStart;

				var cosTheta = Math.cos( theta );
				var 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 ( x = 0; x < radialSegments; x ++ ) {

				var c = centerIndexStart + x;
				var 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;

		}

	}

	CylinderBufferGeometry.prototype = Object.create( BufferGeometry.prototype );
	CylinderBufferGeometry.prototype.constructor = CylinderBufferGeometry;

	/**
	 * @author abelnation / http://github.com/abelnation
	 */

	// ConeGeometry

	function ConeGeometry( radius, height, radialSegments, heightSegments, openEnded, thetaStart, thetaLength ) {

		CylinderGeometry.call( this, 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
		};

	}

	ConeGeometry.prototype = Object.create( CylinderGeometry.prototype );
	ConeGeometry.prototype.constructor = ConeGeometry;

	// ConeBufferGeometry

	function ConeBufferGeometry( radius, height, radialSegments, heightSegments, openEnded, thetaStart, thetaLength ) {

		CylinderBufferGeometry.call( this, 0, radius, height, radialSegments, heightSegments, openEnded, thetaStart, thetaLength );

		this.type = 'ConeBufferGeometry';

		this.parameters = {
			radius: radius,
			height: height,
			radialSegments: radialSegments,
			heightSegments: heightSegments,
			openEnded: openEnded,
			thetaStart: thetaStart,
			thetaLength: thetaLength
		};

	}

	ConeBufferGeometry.prototype = Object.create( CylinderBufferGeometry.prototype );
	ConeBufferGeometry.prototype.constructor = ConeBufferGeometry;

	/**
	 * @author benaadams / https://twitter.com/ben_a_adams
	 * @author Mugen87 / https://github.com/Mugen87
	 * @author hughes
	 */

	// CircleGeometry

	function CircleGeometry( radius, segments, thetaStart, thetaLength ) {

		Geometry.call( this );

		this.type = 'CircleGeometry';

		this.parameters = {
			radius: radius,
			segments: segments,
			thetaStart: thetaStart,
			thetaLength: thetaLength
		};

		this.fromBufferGeometry( new CircleBufferGeometry( radius, segments, thetaStart, thetaLength ) );
		this.mergeVertices();

	}

	CircleGeometry.prototype = Object.create( Geometry.prototype );
	CircleGeometry.prototype.constructor = CircleGeometry;

	// CircleBufferGeometry

	function CircleBufferGeometry( radius, segments, thetaStart, thetaLength ) {

		BufferGeometry.call( this );

		this.type = 'CircleBufferGeometry';

		this.parameters = {
			radius: radius,
			segments: segments,
			thetaStart: thetaStart,
			thetaLength: thetaLength
		};

		radius = radius || 1;
		segments = segments !== undefined ? Math.max( 3, segments ) : 8;

		thetaStart = thetaStart !== undefined ? thetaStart : 0;
		thetaLength = thetaLength !== undefined ? thetaLength : Math.PI * 2;

		// buffers

		var indices = [];
		var vertices = [];
		var normals = [];
		var uvs = [];

		// helper variables

		var i, s;
		var vertex = new Vector3();
		var uv = new Vector2();

		// center point

		vertices.push( 0, 0, 0 );
		normals.push( 0, 0, 1 );
		uvs.push( 0.5, 0.5 );

		for ( s = 0, i = 3; s <= segments; s ++, i += 3 ) {

			var 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 ( 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 ) );

	}

	CircleBufferGeometry.prototype = Object.create( BufferGeometry.prototype );
	CircleBufferGeometry.prototype.constructor = CircleBufferGeometry;



	var Geometries = /*#__PURE__*/Object.freeze({
		__proto__: null,
		WireframeGeometry: WireframeGeometry,
		ParametricGeometry: ParametricGeometry,
		ParametricBufferGeometry: ParametricBufferGeometry,
		TetrahedronGeometry: TetrahedronGeometry,
		TetrahedronBufferGeometry: TetrahedronBufferGeometry,
		OctahedronGeometry: OctahedronGeometry,
		OctahedronBufferGeometry: OctahedronBufferGeometry,
		IcosahedronGeometry: IcosahedronGeometry,
		IcosahedronBufferGeometry: IcosahedronBufferGeometry,
		DodecahedronGeometry: DodecahedronGeometry,
		DodecahedronBufferGeometry: DodecahedronBufferGeometry,
		PolyhedronGeometry: PolyhedronGeometry,
		PolyhedronBufferGeometry: PolyhedronBufferGeometry,
		TubeGeometry: TubeGeometry,
		TubeBufferGeometry: TubeBufferGeometry,
		TorusKnotGeometry: TorusKnotGeometry,
		TorusKnotBufferGeometry: TorusKnotBufferGeometry,
		TorusGeometry: TorusGeometry,
		TorusBufferGeometry: TorusBufferGeometry,
		TextGeometry: TextGeometry,
		TextBufferGeometry: TextBufferGeometry,
		SphereGeometry: SphereGeometry,
		SphereBufferGeometry: SphereBufferGeometry,
		RingGeometry: RingGeometry,
		RingBufferGeometry: RingBufferGeometry,
		PlaneGeometry: PlaneGeometry,
		PlaneBufferGeometry: PlaneBufferGeometry,
		LatheGeometry: LatheGeometry,
		LatheBufferGeometry: LatheBufferGeometry,
		ShapeGeometry: ShapeGeometry,
		ShapeBufferGeometry: ShapeBufferGeometry,
		ExtrudeGeometry: ExtrudeGeometry,
		ExtrudeBufferGeometry: ExtrudeBufferGeometry,
		EdgesGeometry: EdgesGeometry,
		ConeGeometry: ConeGeometry,
		ConeBufferGeometry: ConeBufferGeometry,
		CylinderGeometry: CylinderGeometry,
		CylinderBufferGeometry: CylinderBufferGeometry,
		CircleGeometry: CircleGeometry,
		CircleBufferGeometry: CircleBufferGeometry,
		BoxGeometry: BoxGeometry,
		BoxBufferGeometry: BoxBufferGeometry
	});

	/**
	 * @author mrdoob / http://mrdoob.com/
	 *
	 * parameters = {
	 *  color: <THREE.Color>
	 * }
	 */

	function ShadowMaterial( parameters ) {

		Material.call( this );

		this.type = 'ShadowMaterial';

		this.color = new Color( 0x000000 );
		this.transparent = true;

		this.setValues( parameters );

	}

	ShadowMaterial.prototype = Object.create( Material.prototype );
	ShadowMaterial.prototype.constructor = ShadowMaterial;

	ShadowMaterial.prototype.isShadowMaterial = true;

	ShadowMaterial.prototype.copy = function ( source ) {

		Material.prototype.copy.call( this, source );

		this.color.copy( source.color );

		return this;

	};

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function RawShaderMaterial( parameters ) {

		ShaderMaterial.call( this, parameters );

		this.type = 'RawShaderMaterial';

	}

	RawShaderMaterial.prototype = Object.create( ShaderMaterial.prototype );
	RawShaderMaterial.prototype.constructor = RawShaderMaterial;

	RawShaderMaterial.prototype.isRawShaderMaterial = true;

	/**
	 * @author WestLangley / http://github.com/WestLangley
	 *
	 * parameters = {
	 *  color: <hex>,
	 *  roughness: <float>,
	 *  metalness: <float>,
	 *  opacity: <float>,
	 *
	 *  map: new THREE.Texture( <Image> ),
	 *
	 *  lightMap: new THREE.Texture( <Image> ),
	 *  lightMapIntensity: <float>
	 *
	 *  aoMap: new THREE.Texture( <Image> ),
	 *  aoMapIntensity: <float>
	 *
	 *  emissive: <hex>,
	 *  emissiveIntensity: <float>
	 *  emissiveMap: new THREE.Texture( <Image> ),
	 *
	 *  bumpMap: new THREE.Texture( <Image> ),
	 *  bumpScale: <float>,
	 *
	 *  normalMap: new THREE.Texture( <Image> ),
	 *  normalMapType: THREE.TangentSpaceNormalMap,
	 *  normalScale: <Vector2>,
	 *
	 *  displacementMap: new THREE.Texture( <Image> ),
	 *  displacementScale: <float>,
	 *  displacementBias: <float>,
	 *
	 *  roughnessMap: new THREE.Texture( <Image> ),
	 *
	 *  metalnessMap: new THREE.Texture( <Image> ),
	 *
	 *  alphaMap: new THREE.Texture( <Image> ),
	 *
	 *  envMap: new THREE.CubeTexture( [posx, negx, posy, negy, posz, negz] ),
	 *  envMapIntensity: <float>
	 *
	 *  refractionRatio: <float>,
	 *
	 *  wireframe: <boolean>,
	 *  wireframeLinewidth: <float>,
	 *
	 *  skinning: <bool>,
	 *  morphTargets: <bool>,
	 *  morphNormals: <bool>
	 * }
	 */

	function MeshStandardMaterial( parameters ) {

		Material.call( this );

		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.envMapIntensity = 1.0;

		this.refractionRatio = 0.98;

		this.wireframe = false;
		this.wireframeLinewidth = 1;
		this.wireframeLinecap = 'round';
		this.wireframeLinejoin = 'round';

		this.skinning = false;
		this.morphTargets = false;
		this.morphNormals = false;

		this.vertexTangents = false;

		this.setValues( parameters );

	}

	MeshStandardMaterial.prototype = Object.create( Material.prototype );
	MeshStandardMaterial.prototype.constructor = MeshStandardMaterial;

	MeshStandardMaterial.prototype.isMeshStandardMaterial = true;

	MeshStandardMaterial.prototype.copy = function ( source ) {

		Material.prototype.copy.call( this, 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.envMapIntensity = source.envMapIntensity;

		this.refractionRatio = source.refractionRatio;

		this.wireframe = source.wireframe;
		this.wireframeLinewidth = source.wireframeLinewidth;
		this.wireframeLinecap = source.wireframeLinecap;
		this.wireframeLinejoin = source.wireframeLinejoin;

		this.skinning = source.skinning;
		this.morphTargets = source.morphTargets;
		this.morphNormals = source.morphNormals;

		this.vertexTangents = source.vertexTangents;

		return this;

	};

	/**
	 * @author WestLangley / http://github.com/WestLangley
	 *
	 * parameters = {
	 *  reflectivity: <float>
	 *  clearcoat: <float>
	 *  clearcoatRoughness: <float>
	 *
	 *  sheen: <Color>
	 *
	 *  clearcoatNormalScale: <Vector2>,
	 *  clearcoatNormalMap: new THREE.Texture( <Image> ),
	 * }
	 */

	function MeshPhysicalMaterial( parameters ) {

		MeshStandardMaterial.call( this );

		this.defines = {

			'STANDARD': '',
			'PHYSICAL': ''

		};

		this.type = 'MeshPhysicalMaterial';

		this.reflectivity = 0.5; // maps to F0 = 0.04

		this.clearcoat = 0.0;
		this.clearcoatRoughness = 0.0;

		this.sheen = null; // null will disable sheen bsdf

		this.clearcoatNormalScale = new Vector2( 1, 1 );
		this.clearcoatNormalMap = null;

		this.transparency = 0.0;

		this.setValues( parameters );

	}

	MeshPhysicalMaterial.prototype = Object.create( MeshStandardMaterial.prototype );
	MeshPhysicalMaterial.prototype.constructor = MeshPhysicalMaterial;

	MeshPhysicalMaterial.prototype.isMeshPhysicalMaterial = true;

	MeshPhysicalMaterial.prototype.copy = function ( source ) {

		MeshStandardMaterial.prototype.copy.call( this, source );

		this.defines = {

			'STANDARD': '',
			'PHYSICAL': ''

		};

		this.reflectivity = source.reflectivity;

		this.clearcoat = source.clearcoat;
		this.clearcoatRoughness = source.clearcoatRoughness;

		if ( source.sheen ) { this.sheen = ( this.sheen || new Color() ).copy( source.sheen ); }
		else { this.sheen = null; }

		this.clearcoatNormalMap = source.clearcoatNormalMap;
		this.clearcoatNormalScale.copy( source.clearcoatNormalScale );

		this.transparency = source.transparency;

		return this;

	};

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author alteredq / http://alteredqualia.com/
	 *
	 * parameters = {
	 *  color: <hex>,
	 *  specular: <hex>,
	 *  shininess: <float>,
	 *  opacity: <float>,
	 *
	 *  map: new THREE.Texture( <Image> ),
	 *
	 *  lightMap: new THREE.Texture( <Image> ),
	 *  lightMapIntensity: <float>
	 *
	 *  aoMap: new THREE.Texture( <Image> ),
	 *  aoMapIntensity: <float>
	 *
	 *  emissive: <hex>,
	 *  emissiveIntensity: <float>
	 *  emissiveMap: new THREE.Texture( <Image> ),
	 *
	 *  bumpMap: new THREE.Texture( <Image> ),
	 *  bumpScale: <float>,
	 *
	 *  normalMap: new THREE.Texture( <Image> ),
	 *  normalMapType: THREE.TangentSpaceNormalMap,
	 *  normalScale: <Vector2>,
	 *
	 *  displacementMap: new THREE.Texture( <Image> ),
	 *  displacementScale: <float>,
	 *  displacementBias: <float>,
	 *
	 *  specularMap: new THREE.Texture( <Image> ),
	 *
	 *  alphaMap: new THREE.Texture( <Image> ),
	 *
	 *  envMap: new THREE.CubeTexture( [posx, negx, posy, negy, posz, negz] ),
	 *  combine: THREE.MultiplyOperation,
	 *  reflectivity: <float>,
	 *  refractionRatio: <float>,
	 *
	 *  wireframe: <boolean>,
	 *  wireframeLinewidth: <float>,
	 *
	 *  skinning: <bool>,
	 *  morphTargets: <bool>,
	 *  morphNormals: <bool>
	 * }
	 */

	function MeshPhongMaterial( parameters ) {

		Material.call( this );

		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.combine = MultiplyOperation;
		this.reflectivity = 1;
		this.refractionRatio = 0.98;

		this.wireframe = false;
		this.wireframeLinewidth = 1;
		this.wireframeLinecap = 'round';
		this.wireframeLinejoin = 'round';

		this.skinning = false;
		this.morphTargets = false;
		this.morphNormals = false;

		this.setValues( parameters );

	}

	MeshPhongMaterial.prototype = Object.create( Material.prototype );
	MeshPhongMaterial.prototype.constructor = MeshPhongMaterial;

	MeshPhongMaterial.prototype.isMeshPhongMaterial = true;

	MeshPhongMaterial.prototype.copy = function ( source ) {

		Material.prototype.copy.call( this, 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.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.skinning = source.skinning;
		this.morphTargets = source.morphTargets;
		this.morphNormals = source.morphNormals;

		return this;

	};

	/**
	 * @author takahirox / http://github.com/takahirox
	 *
	 * parameters = {
	 *  color: <hex>,
	 *  specular: <hex>,
	 *  shininess: <float>,
	 *
	 *  map: new THREE.Texture( <Image> ),
	 *  gradientMap: new THREE.Texture( <Image> ),
	 *
	 *  lightMap: new THREE.Texture( <Image> ),
	 *  lightMapIntensity: <float>
	 *
	 *  aoMap: new THREE.Texture( <Image> ),
	 *  aoMapIntensity: <float>
	 *
	 *  emissive: <hex>,
	 *  emissiveIntensity: <float>
	 *  emissiveMap: new THREE.Texture( <Image> ),
	 *
	 *  bumpMap: new THREE.Texture( <Image> ),
	 *  bumpScale: <float>,
	 *
	 *  normalMap: new THREE.Texture( <Image> ),
	 *  normalMapType: THREE.TangentSpaceNormalMap,
	 *  normalScale: <Vector2>,
	 *
	 *  displacementMap: new THREE.Texture( <Image> ),
	 *  displacementScale: <float>,
	 *  displacementBias: <float>,
	 *
	 *  specularMap: new THREE.Texture( <Image> ),
	 *
	 *  alphaMap: new THREE.Texture( <Image> ),
	 *
	 *  wireframe: <boolean>,
	 *  wireframeLinewidth: <float>,
	 *
	 *  skinning: <bool>,
	 *  morphTargets: <bool>,
	 *  morphNormals: <bool>
	 * }
	 */

	function MeshToonMaterial( parameters ) {

		Material.call( this );

		this.defines = { 'TOON': '' };

		this.type = 'MeshToonMaterial';

		this.color = new Color( 0xffffff );
		this.specular = new Color( 0x111111 );
		this.shininess = 30;

		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.specularMap = null;

		this.alphaMap = null;

		this.wireframe = false;
		this.wireframeLinewidth = 1;
		this.wireframeLinecap = 'round';
		this.wireframeLinejoin = 'round';

		this.skinning = false;
		this.morphTargets = false;
		this.morphNormals = false;

		this.setValues( parameters );

	}

	MeshToonMaterial.prototype = Object.create( Material.prototype );
	MeshToonMaterial.prototype.constructor = MeshToonMaterial;

	MeshToonMaterial.prototype.isMeshToonMaterial = true;

	MeshToonMaterial.prototype.copy = function ( source ) {

		Material.prototype.copy.call( this, source );

		this.color.copy( source.color );
		this.specular.copy( source.specular );
		this.shininess = source.shininess;

		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.specularMap = source.specularMap;

		this.alphaMap = source.alphaMap;

		this.wireframe = source.wireframe;
		this.wireframeLinewidth = source.wireframeLinewidth;
		this.wireframeLinecap = source.wireframeLinecap;
		this.wireframeLinejoin = source.wireframeLinejoin;

		this.skinning = source.skinning;
		this.morphTargets = source.morphTargets;
		this.morphNormals = source.morphNormals;

		return this;

	};

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author WestLangley / http://github.com/WestLangley
	 *
	 * parameters = {
	 *  opacity: <float>,
	 *
	 *  bumpMap: new THREE.Texture( <Image> ),
	 *  bumpScale: <float>,
	 *
	 *  normalMap: new THREE.Texture( <Image> ),
	 *  normalMapType: THREE.TangentSpaceNormalMap,
	 *  normalScale: <Vector2>,
	 *
	 *  displacementMap: new THREE.Texture( <Image> ),
	 *  displacementScale: <float>,
	 *  displacementBias: <float>,
	 *
	 *  wireframe: <boolean>,
	 *  wireframeLinewidth: <float>
	 *
	 *  skinning: <bool>,
	 *  morphTargets: <bool>,
	 *  morphNormals: <bool>
	 * }
	 */

	function MeshNormalMaterial( parameters ) {

		Material.call( this );

		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.fog = false;

		this.skinning = false;
		this.morphTargets = false;
		this.morphNormals = false;

		this.setValues( parameters );

	}

	MeshNormalMaterial.prototype = Object.create( Material.prototype );
	MeshNormalMaterial.prototype.constructor = MeshNormalMaterial;

	MeshNormalMaterial.prototype.isMeshNormalMaterial = true;

	MeshNormalMaterial.prototype.copy = function ( source ) {

		Material.prototype.copy.call( this, 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.skinning = source.skinning;
		this.morphTargets = source.morphTargets;
		this.morphNormals = source.morphNormals;

		return this;

	};

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author alteredq / http://alteredqualia.com/
	 *
	 * parameters = {
	 *  color: <hex>,
	 *  opacity: <float>,
	 *
	 *  map: new THREE.Texture( <Image> ),
	 *
	 *  lightMap: new THREE.Texture( <Image> ),
	 *  lightMapIntensity: <float>
	 *
	 *  aoMap: new THREE.Texture( <Image> ),
	 *  aoMapIntensity: <float>
	 *
	 *  emissive: <hex>,
	 *  emissiveIntensity: <float>
	 *  emissiveMap: new THREE.Texture( <Image> ),
	 *
	 *  specularMap: new THREE.Texture( <Image> ),
	 *
	 *  alphaMap: new THREE.Texture( <Image> ),
	 *
	 *  envMap: new THREE.CubeTexture( [posx, negx, posy, negy, posz, negz] ),
	 *  combine: THREE.Multiply,
	 *  reflectivity: <float>,
	 *  refractionRatio: <float>,
	 *
	 *  wireframe: <boolean>,
	 *  wireframeLinewidth: <float>,
	 *
	 *  skinning: <bool>,
	 *  morphTargets: <bool>,
	 *  morphNormals: <bool>
	 * }
	 */

	function MeshLambertMaterial( parameters ) {

		Material.call( this );

		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.specularMap = null;

		this.alphaMap = null;

		this.envMap = null;
		this.combine = MultiplyOperation;
		this.reflectivity = 1;
		this.refractionRatio = 0.98;

		this.wireframe = false;
		this.wireframeLinewidth = 1;
		this.wireframeLinecap = 'round';
		this.wireframeLinejoin = 'round';

		this.skinning = false;
		this.morphTargets = false;
		this.morphNormals = false;

		this.setValues( parameters );

	}

	MeshLambertMaterial.prototype = Object.create( Material.prototype );
	MeshLambertMaterial.prototype.constructor = MeshLambertMaterial;

	MeshLambertMaterial.prototype.isMeshLambertMaterial = true;

	MeshLambertMaterial.prototype.copy = function ( source ) {

		Material.prototype.copy.call( this, 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.specularMap = source.specularMap;

		this.alphaMap = source.alphaMap;

		this.envMap = source.envMap;
		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.skinning = source.skinning;
		this.morphTargets = source.morphTargets;
		this.morphNormals = source.morphNormals;

		return this;

	};

	/**
	 * @author WestLangley / http://github.com/WestLangley
	 *
	 * parameters = {
	 *  color: <hex>,
	 *  opacity: <float>,
	 *
	 *  matcap: new THREE.Texture( <Image> ),
	 *
	 *  map: new THREE.Texture( <Image> ),
	 *
	 *  bumpMap: new THREE.Texture( <Image> ),
	 *  bumpScale: <float>,
	 *
	 *  normalMap: new THREE.Texture( <Image> ),
	 *  normalMapType: THREE.TangentSpaceNormalMap,
	 *  normalScale: <Vector2>,
	 *
	 *  displacementMap: new THREE.Texture( <Image> ),
	 *  displacementScale: <float>,
	 *  displacementBias: <float>,
	 *
	 *  alphaMap: new THREE.Texture( <Image> ),
	 *
	 *  skinning: <bool>,
	 *  morphTargets: <bool>,
	 *  morphNormals: <bool>
	 * }
	 */

	function MeshMatcapMaterial( parameters ) {

		Material.call( this );

		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.skinning = false;
		this.morphTargets = false;
		this.morphNormals = false;

		this.setValues( parameters );

	}

	MeshMatcapMaterial.prototype = Object.create( Material.prototype );
	MeshMatcapMaterial.prototype.constructor = MeshMatcapMaterial;

	MeshMatcapMaterial.prototype.isMeshMatcapMaterial = true;

	MeshMatcapMaterial.prototype.copy = function ( source ) {

		Material.prototype.copy.call( this, 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.skinning = source.skinning;
		this.morphTargets = source.morphTargets;
		this.morphNormals = source.morphNormals;

		return this;

	};

	/**
	 * @author alteredq / http://alteredqualia.com/
	 *
	 * parameters = {
	 *  color: <hex>,
	 *  opacity: <float>,
	 *
	 *  linewidth: <float>,
	 *
	 *  scale: <float>,
	 *  dashSize: <float>,
	 *  gapSize: <float>
	 * }
	 */

	function LineDashedMaterial( parameters ) {

		LineBasicMaterial.call( this );

		this.type = 'LineDashedMaterial';

		this.scale = 1;
		this.dashSize = 3;
		this.gapSize = 1;

		this.setValues( parameters );

	}

	LineDashedMaterial.prototype = Object.create( LineBasicMaterial.prototype );
	LineDashedMaterial.prototype.constructor = LineDashedMaterial;

	LineDashedMaterial.prototype.isLineDashedMaterial = true;

	LineDashedMaterial.prototype.copy = function ( source ) {

		LineBasicMaterial.prototype.copy.call( this, source );

		this.scale = source.scale;
		this.dashSize = source.dashSize;
		this.gapSize = source.gapSize;

		return this;

	};



	var Materials = /*#__PURE__*/Object.freeze({
		__proto__: null,
		ShadowMaterial: ShadowMaterial,
		SpriteMaterial: SpriteMaterial,
		RawShaderMaterial: RawShaderMaterial,
		ShaderMaterial: ShaderMaterial,
		PointsMaterial: PointsMaterial,
		MeshPhysicalMaterial: MeshPhysicalMaterial,
		MeshStandardMaterial: MeshStandardMaterial,
		MeshPhongMaterial: MeshPhongMaterial,
		MeshToonMaterial: MeshToonMaterial,
		MeshNormalMaterial: MeshNormalMaterial,
		MeshLambertMaterial: MeshLambertMaterial,
		MeshDepthMaterial: MeshDepthMaterial,
		MeshDistanceMaterial: MeshDistanceMaterial,
		MeshBasicMaterial: MeshBasicMaterial,
		MeshMatcapMaterial: MeshMatcapMaterial,
		LineDashedMaterial: LineDashedMaterial,
		LineBasicMaterial: LineBasicMaterial,
		Material: Material
	});

	/**
	 * @author tschw
	 * @author Ben Houston / http://clara.io/
	 * @author David Sarno / http://lighthaus.us/
	 */

	var AnimationUtils = {

		// same as Array.prototype.slice, but also works on typed arrays
		arraySlice: function ( array, from, to ) {

			if ( AnimationUtils.isTypedArray( array ) ) {

				// in ios9 array.subarray(from, undefined) will return empty array
				// but array.subarray(from) or array.subarray(from, len) is correct
				return new array.constructor( array.subarray( from, to !== undefined ? to : array.length ) );

			}

			return array.slice( from, to );

		},

		// converts an array to a specific type
		convertArray: function ( 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

		},

		isTypedArray: function ( object ) {

			return ArrayBuffer.isView( object ) &&
				! ( object instanceof DataView );

		},

		// returns an array by which times and values can be sorted
		getKeyframeOrder: function ( times ) {

			function compareTime( i, j ) {

				return times[ i ] - times[ j ];

			}

			var n = times.length;
			var result = new Array( n );
			for ( var i = 0; i !== n; ++ i ) { result[ i ] = i; }

			result.sort( compareTime );

			return result;

		},

		// uses the array previously returned by 'getKeyframeOrder' to sort data
		sortedArray: function ( values, stride, order ) {

			var nValues = values.length;
			var result = new values.constructor( nValues );

			for ( var i = 0, dstOffset = 0; dstOffset !== nValues; ++ i ) {

				var srcOffset = order[ i ] * stride;

				for ( var j = 0; j !== stride; ++ j ) {

					result[ dstOffset ++ ] = values[ srcOffset + j ];

				}

			}

			return result;

		},

		// function for parsing AOS keyframe formats
		flattenJSON: function ( jsonKeys, times, values, valuePropertyName ) {

			var i = 1, key = jsonKeys[ 0 ];

			while ( key !== undefined && key[ valuePropertyName ] === undefined ) {

				key = jsonKeys[ i ++ ];

			}

			if ( key === undefined ) { return; } // no data

			var 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 );

			}

		},

		subclip: function ( sourceClip, name, startFrame, endFrame, fps ) {

			fps = fps || 30;

			var clip = sourceClip.clone();

			clip.name = name;

			var tracks = [];

			for ( var i = 0; i < clip.tracks.length; ++ i ) {

				var track = clip.tracks[ i ];
				var valueSize = track.getValueSize();

				var times = [];
				var values = [];

				for ( var j = 0; j < track.times.length; ++ j ) {

					var frame = track.times[ j ] * fps;

					if ( frame < startFrame || frame >= endFrame ) { continue; }

					times.push( track.times[ j ] );

					for ( var k = 0; k < valueSize; ++ k ) {

						values.push( track.values[ j * valueSize + k ] );

					}

				}

				if ( times.length === 0 ) { continue; }

				track.times = AnimationUtils.convertArray( times, track.times.constructor );
				track.values = AnimationUtils.convertArray( values, track.values.constructor );

				tracks.push( track );

			}

			clip.tracks = tracks;

			// find minimum .times value across all tracks in the trimmed clip

			var minStartTime = Infinity;

			for ( var 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 ( var i = 0; i < clip.tracks.length; ++ i ) {

				clip.tracks[ i ].shift( - 1 * minStartTime );

			}

			clip.resetDuration();

			return clip;

		}

	};

	/**
	 * 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
	 *
	 * @author tschw
	 */

	function Interpolant( 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;

	}

	Object.assign( Interpolant.prototype, {

		evaluate: function ( t ) {

			var pp = this.parameterPositions,
				i1 = this._cachedIndex,

				t1 = pp[ i1 ],
				t0 = pp[ i1 - 1 ];

			validate_interval: {

				seek: {

					var right;

					linear_scan: {

						//- See http://jsperf.com/comparison-to-undefined/3
						//- slower code:
						//-
						//- 				if ( t >= t1 || t1 === undefined ) {
						forward_scan: if ( ! ( t < t1 ) ) {

							for ( var giveUpAt = i1 + 2; ; ) {

								if ( t1 === undefined ) {

									if ( t < t0 ) { break forward_scan; }

									// after end

									i1 = pp.length;
									this._cachedIndex = i1;
									return this.afterEnd_( i1 - 1, t, t0 );

								}

								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?

							var t1global = pp[ 1 ];

							if ( t < t1global ) {

								i1 = 2; // + 1, using the scan for the details
								t0 = t1global;

							}

							// linear reverse scan

							for ( var giveUpAt = i1 - 2; ; ) {

								if ( t0 === undefined ) {

									// before start

									this._cachedIndex = 0;
									return this.beforeStart_( 0, t, t1 );

								}

								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 ) {

						var 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.beforeStart_( 0, t, t1 );

					}

					if ( t1 === undefined ) {

						i1 = pp.length;
						this._cachedIndex = i1;
						return this.afterEnd_( i1 - 1, t0, t );

					}

				} // seek

				this._cachedIndex = i1;

				this.intervalChanged_( i1, t0, t1 );

			} // validate_interval

			return this.interpolate_( i1, t0, t, t1 );

		},

		settings: null, // optional, subclass-specific settings structure
		// Note: The indirection allows central control of many interpolants.

		// --- Protected interface

		DefaultSettings_: {},

		getSettings_: function () {

			return this.settings || this.DefaultSettings_;

		},

		copySampleValue_: function ( index ) {

			// copies a sample value to the result buffer

			var result = this.resultBuffer,
				values = this.sampleValues,
				stride = this.valueSize,
				offset = index * stride;

			for ( var i = 0; i !== stride; ++ i ) {

				result[ i ] = values[ offset + i ];

			}

			return result;

		},

		// Template methods for derived classes:

		interpolate_: function ( /* i1, t0, t, t1 */ ) {

			throw new Error( 'call to abstract method' );
			// implementations shall return this.resultBuffer

		},

		intervalChanged_: function ( /* i1, t0, t1 */ ) {

			// empty

		}

	} );

	//!\ DECLARE ALIAS AFTER assign prototype !
	Object.assign( Interpolant.prototype, {

		//( 0, t, t0 ), returns this.resultBuffer
		beforeStart_: Interpolant.prototype.copySampleValue_,

		//( N-1, tN-1, t ), returns this.resultBuffer
		afterEnd_: Interpolant.prototype.copySampleValue_,

	} );

	/**
	 * 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.
	 *
	 * @author tschw
	 */

	function CubicInterpolant( parameterPositions, sampleValues, sampleSize, resultBuffer ) {

		Interpolant.call( this, parameterPositions, sampleValues, sampleSize, resultBuffer );

		this._weightPrev = - 0;
		this._offsetPrev = - 0;
		this._weightNext = - 0;
		this._offsetNext = - 0;

	}

	CubicInterpolant.prototype = Object.assign( Object.create( Interpolant.prototype ), {

		constructor: CubicInterpolant,

		DefaultSettings_: {

			endingStart: ZeroCurvatureEnding,
			endingEnd: ZeroCurvatureEnding

		},

		intervalChanged_: function ( i1, t0, t1 ) {

			var pp = this.parameterPositions,
				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;

				}

			}

			var 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_: function ( i1, t0, t, t1 ) {

			var 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

			var sP = - wP * ppp + 2 * wP * pp - wP * p;
			var s0 = ( 1 + wP ) * ppp + ( - 1.5 - 2 * wP ) * pp + ( - 0.5 + wP ) * p + 1;
			var s1 = ( - 1 - wN ) * ppp + ( 1.5 + wN ) * pp + 0.5 * p;
			var sN = wN * ppp - wN * pp;

			// combine data linearly

			for ( var 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;

		}

	} );

	/**
	 * @author tschw
	 */

	function LinearInterpolant( parameterPositions, sampleValues, sampleSize, resultBuffer ) {

		Interpolant.call( this, parameterPositions, sampleValues, sampleSize, resultBuffer );

	}

	LinearInterpolant.prototype = Object.assign( Object.create( Interpolant.prototype ), {

		constructor: LinearInterpolant,

		interpolate_: function ( i1, t0, t, t1 ) {

			var result = this.resultBuffer,
				values = this.sampleValues,
				stride = this.valueSize,

				offset1 = i1 * stride,
				offset0 = offset1 - stride,

				weight1 = ( t - t0 ) / ( t1 - t0 ),
				weight0 = 1 - weight1;

			for ( var 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 preceeding
	 * the parameter.
	 *
	 * @author tschw
	 */

	function DiscreteInterpolant( parameterPositions, sampleValues, sampleSize, resultBuffer ) {

		Interpolant.call( this, parameterPositions, sampleValues, sampleSize, resultBuffer );

	}

	DiscreteInterpolant.prototype = Object.assign( Object.create( Interpolant.prototype ), {

		constructor: DiscreteInterpolant,

		interpolate_: function ( i1 /*, t0, t, t1 */ ) {

			return this.copySampleValue_( i1 - 1 );

		}

	} );

	/**
	 *
	 * A timed sequence of keyframes for a specific property.
	 *
	 *
	 * @author Ben Houston / http://clara.io/
	 * @author David Sarno / http://lighthaus.us/
	 * @author tschw
	 */

	function KeyframeTrack( 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 = AnimationUtils.convertArray( times, this.TimeBufferType );
		this.values = AnimationUtils.convertArray( values, this.ValueBufferType );

		this.setInterpolation( interpolation || this.DefaultInterpolation );

	}

	// Static methods

	Object.assign( KeyframeTrack, {

		// Serialization (in static context, because of constructor invocation
		// and automatic invocation of .toJSON):

		toJSON: function ( track ) {

			var trackType = track.constructor;

			var json;

			// derived classes can define a static toJSON method
			if ( trackType.toJSON !== undefined ) {

				json = trackType.toJSON( track );

			} else {

				// by default, we assume the data can be serialized as-is
				json = {

					'name': track.name,
					'times': AnimationUtils.convertArray( track.times, Array ),
					'values': AnimationUtils.convertArray( track.values, Array )

				};

				var interpolation = track.getInterpolation();

				if ( interpolation !== track.DefaultInterpolation ) {

					json.interpolation = interpolation;

				}

			}

			json.type = track.ValueTypeName; // mandatory

			return json;

		}

	} );

	Object.assign( KeyframeTrack.prototype, {

		constructor: KeyframeTrack,

		TimeBufferType: Float32Array,

		ValueBufferType: Float32Array,

		DefaultInterpolation: InterpolateLinear,

		InterpolantFactoryMethodDiscrete: function ( result ) {

			return new DiscreteInterpolant( this.times, this.values, this.getValueSize(), result );

		},

		InterpolantFactoryMethodLinear: function ( result ) {

			return new LinearInterpolant( this.times, this.values, this.getValueSize(), result );

		},

		InterpolantFactoryMethodSmooth: function ( result ) {

			return new CubicInterpolant( this.times, this.values, this.getValueSize(), result );

		},

		setInterpolation: function ( interpolation ) {

			var factoryMethod;

			switch ( interpolation ) {

				case InterpolateDiscrete:

					factoryMethod = this.InterpolantFactoryMethodDiscrete;

					break;

				case InterpolateLinear:

					factoryMethod = this.InterpolantFactoryMethodLinear;

					break;

				case InterpolateSmooth:

					factoryMethod = this.InterpolantFactoryMethodSmooth;

					break;

			}

			if ( factoryMethod === undefined ) {

				var 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: function () {

			switch ( this.createInterpolant ) {

				case this.InterpolantFactoryMethodDiscrete:

					return InterpolateDiscrete;

				case this.InterpolantFactoryMethodLinear:

					return InterpolateLinear;

				case this.InterpolantFactoryMethodSmooth:

					return InterpolateSmooth;

			}

		},

		getValueSize: function () {

			return this.values.length / this.times.length;

		},

		// move all keyframes either forwards or backwards in time
		shift: function ( timeOffset ) {

			if ( timeOffset !== 0.0 ) {

				var times = this.times;

				for ( var 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: function ( timeScale ) {

			if ( timeScale !== 1.0 ) {

				var times = this.times;

				for ( var 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: function ( startTime, endTime ) {

			var times = this.times,
				nKeys = times.length,
				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;

				}

				var stride = this.getValueSize();
				this.times = AnimationUtils.arraySlice( times, from, to );
				this.values = AnimationUtils.arraySlice( this.values, from * stride, to * stride );

			}

			return this;

		},

		// ensure we do not get a GarbageInGarbageOut situation, make sure tracks are at least minimally viable
		validate: function () {

			var valid = true;

			var valueSize = this.getValueSize();
			if ( valueSize - Math.floor( valueSize ) !== 0 ) {

				console.error( 'THREE.KeyframeTrack: Invalid value size in track.', this );
				valid = false;

			}

			var times = this.times,
				values = this.values,

				nKeys = times.length;

			if ( nKeys === 0 ) {

				console.error( 'THREE.KeyframeTrack: Track is empty.', this );
				valid = false;

			}

			var prevTime = null;

			for ( var i = 0; i !== nKeys; i ++ ) {

				var 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 ( AnimationUtils.isTypedArray( values ) ) {

					for ( var i = 0, n = values.length; i !== n; ++ i ) {

						var 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: function () {

			// times or values may be shared with other tracks, so overwriting is unsafe
			var times = AnimationUtils.arraySlice( this.times ),
				values = AnimationUtils.arraySlice( this.values ),
				stride = this.getValueSize(),

				smoothInterpolation = this.getInterpolation() === InterpolateSmooth,

				writeIndex = 1,
				lastIndex = times.length - 1;

			for ( var i = 1; i < lastIndex; ++ i ) {

				var keep = false;

				var time = times[ i ];
				var timeNext = times[ i + 1 ];

				// remove adjacent keyframes scheduled at the same time

				if ( time !== timeNext && ( i !== 1 || time !== time[ 0 ] ) ) {

					if ( ! smoothInterpolation ) {

						// remove unnecessary keyframes same as their neighbors

						var offset = i * stride,
							offsetP = offset - stride,
							offsetN = offset + stride;

						for ( var j = 0; j !== stride; ++ j ) {

							var 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 ];

						var readOffset = i * stride,
							writeOffset = writeIndex * stride;

						for ( var 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 ( var readOffset = lastIndex * stride, writeOffset = writeIndex * stride, j = 0; j !== stride; ++ j ) {

					values[ writeOffset + j ] = values[ readOffset + j ];

				}

				++ writeIndex;

			}

			if ( writeIndex !== times.length ) {

				this.times = AnimationUtils.arraySlice( times, 0, writeIndex );
				this.values = AnimationUtils.arraySlice( values, 0, writeIndex * stride );

			} else {

				this.times = times;
				this.values = values;

			}

			return this;

		},

		clone: function () {

			var times = AnimationUtils.arraySlice( this.times, 0 );
			var values = AnimationUtils.arraySlice( this.values, 0 );

			var TypedKeyframeTrack = this.constructor;
			var 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;

		}

	} );

	/**
	 *
	 * A Track of Boolean keyframe values.
	 *
	 *
	 * @author Ben Houston / http://clara.io/
	 * @author David Sarno / http://lighthaus.us/
	 * @author tschw
	 */

	function BooleanKeyframeTrack( name, times, values ) {

		KeyframeTrack.call( this, name, times, values );

	}

	BooleanKeyframeTrack.prototype = Object.assign( Object.create( KeyframeTrack.prototype ), {

		constructor: BooleanKeyframeTrack,

		ValueTypeName: 'bool',
		ValueBufferType: Array,

		DefaultInterpolation: InterpolateDiscrete,

		InterpolantFactoryMethodLinear: undefined,
		InterpolantFactoryMethodSmooth: undefined

		// Note: Actually this track could have a optimized / compressed
		// representation of a single value and a custom interpolant that
		// computes "firstValue ^ isOdd( index )".

	} );

	/**
	 *
	 * A Track of keyframe values that represent color.
	 *
	 *
	 * @author Ben Houston / http://clara.io/
	 * @author David Sarno / http://lighthaus.us/
	 * @author tschw
	 */

	function ColorKeyframeTrack( name, times, values, interpolation ) {

		KeyframeTrack.call( this, name, times, values, interpolation );

	}

	ColorKeyframeTrack.prototype = Object.assign( Object.create( KeyframeTrack.prototype ), {

		constructor: ColorKeyframeTrack,

		ValueTypeName: 'color'

		// ValueBufferType is inherited

		// DefaultInterpolation is inherited

		// Note: Very basic implementation and nothing special yet.
		// However, this is the place for color space parameterization.

	} );

	/**
	 *
	 * A Track of numeric keyframe values.
	 *
	 * @author Ben Houston / http://clara.io/
	 * @author David Sarno / http://lighthaus.us/
	 * @author tschw
	 */

	function NumberKeyframeTrack( name, times, values, interpolation ) {

		KeyframeTrack.call( this, name, times, values, interpolation );

	}

	NumberKeyframeTrack.prototype = Object.assign( Object.create( KeyframeTrack.prototype ), {

		constructor: NumberKeyframeTrack,

		ValueTypeName: 'number'

		// ValueBufferType is inherited

		// DefaultInterpolation is inherited

	} );

	/**
	 * Spherical linear unit quaternion interpolant.
	 *
	 * @author tschw
	 */

	function QuaternionLinearInterpolant( parameterPositions, sampleValues, sampleSize, resultBuffer ) {

		Interpolant.call( this, parameterPositions, sampleValues, sampleSize, resultBuffer );

	}

	QuaternionLinearInterpolant.prototype = Object.assign( Object.create( Interpolant.prototype ), {

		constructor: QuaternionLinearInterpolant,

		interpolate_: function ( i1, t0, t, t1 ) {

			var result = this.resultBuffer,
				values = this.sampleValues,
				stride = this.valueSize,

				offset = i1 * stride,

				alpha = ( t - t0 ) / ( t1 - t0 );

			for ( var 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.
	 *
	 * @author Ben Houston / http://clara.io/
	 * @author David Sarno / http://lighthaus.us/
	 * @author tschw
	 */

	function QuaternionKeyframeTrack( name, times, values, interpolation ) {

		KeyframeTrack.call( this, name, times, values, interpolation );

	}

	QuaternionKeyframeTrack.prototype = Object.assign( Object.create( KeyframeTrack.prototype ), {

		constructor: QuaternionKeyframeTrack,

		ValueTypeName: 'quaternion',

		// ValueBufferType is inherited

		DefaultInterpolation: InterpolateLinear,

		InterpolantFactoryMethodLinear: function ( result ) {

			return new QuaternionLinearInterpolant( this.times, this.values, this.getValueSize(), result );

		},

		InterpolantFactoryMethodSmooth: undefined // not yet implemented

	} );

	/**
	 *
	 * A Track that interpolates Strings
	 *
	 *
	 * @author Ben Houston / http://clara.io/
	 * @author David Sarno / http://lighthaus.us/
	 * @author tschw
	 */

	function StringKeyframeTrack( name, times, values, interpolation ) {

		KeyframeTrack.call( this, name, times, values, interpolation );

	}

	StringKeyframeTrack.prototype = Object.assign( Object.create( KeyframeTrack.prototype ), {

		constructor: StringKeyframeTrack,

		ValueTypeName: 'string',
		ValueBufferType: Array,

		DefaultInterpolation: InterpolateDiscrete,

		InterpolantFactoryMethodLinear: undefined,

		InterpolantFactoryMethodSmooth: undefined

	} );

	/**
	 *
	 * A Track of vectored keyframe values.
	 *
	 *
	 * @author Ben Houston / http://clara.io/
	 * @author David Sarno / http://lighthaus.us/
	 * @author tschw
	 */

	function VectorKeyframeTrack( name, times, values, interpolation ) {

		KeyframeTrack.call( this, name, times, values, interpolation );

	}

	VectorKeyframeTrack.prototype = Object.assign( Object.create( KeyframeTrack.prototype ), {

		constructor: VectorKeyframeTrack,

		ValueTypeName: 'vector'

		// ValueBufferType is inherited

		// DefaultInterpolation is inherited

	} );

	/**
	 *
	 * Reusable set of Tracks that represent an animation.
	 *
	 * @author Ben Houston / http://clara.io/
	 * @author David Sarno / http://lighthaus.us/
	 */

	function AnimationClip( name, duration, tracks ) {

		this.name = name;
		this.tracks = tracks;
		this.duration = ( duration !== undefined ) ? duration : - 1;

		this.uuid = MathUtils.generateUUID();

		// this means it should figure out its duration by scanning the tracks
		if ( this.duration < 0 ) {

			this.resetDuration();

		}

	}

	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' );

		}

		var trackType = getTrackTypeForValueTypeName( json.type );

		if ( json.times === undefined ) {

			var times = [], values = [];

			AnimationUtils.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 );

		}

	}

	Object.assign( AnimationClip, {

		parse: function ( json ) {

			var tracks = [],
				jsonTracks = json.tracks,
				frameTime = 1.0 / ( json.fps || 1.0 );

			for ( var i = 0, n = jsonTracks.length; i !== n; ++ i ) {

				tracks.push( parseKeyframeTrack( jsonTracks[ i ] ).scale( frameTime ) );

			}

			return new AnimationClip( json.name, json.duration, tracks );

		},

		toJSON: function ( clip ) {

			var tracks = [],
				clipTracks = clip.tracks;

			var json = {

				'name': clip.name,
				'duration': clip.duration,
				'tracks': tracks,
				'uuid': clip.uuid

			};

			for ( var i = 0, n = clipTracks.length; i !== n; ++ i ) {

				tracks.push( KeyframeTrack.toJSON( clipTracks[ i ] ) );

			}

			return json;

		},

		CreateFromMorphTargetSequence: function ( name, morphTargetSequence, fps, noLoop ) {

			var numMorphTargets = morphTargetSequence.length;
			var tracks = [];

			for ( var i = 0; i < numMorphTargets; i ++ ) {

				var times = [];
				var values = [];

				times.push(
					( i + numMorphTargets - 1 ) % numMorphTargets,
					i,
					( i + 1 ) % numMorphTargets );

				values.push( 0, 1, 0 );

				var order = AnimationUtils.getKeyframeOrder( times );
				times = AnimationUtils.sortedArray( times, 1, order );
				values = AnimationUtils.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 AnimationClip( name, - 1, tracks );

		},

		findByName: function ( objectOrClipArray, name ) {

			var clipArray = objectOrClipArray;

			if ( ! Array.isArray( objectOrClipArray ) ) {

				var o = objectOrClipArray;
				clipArray = o.geometry && o.geometry.animations || o.animations;

			}

			for ( var i = 0; i < clipArray.length; i ++ ) {

				if ( clipArray[ i ].name === name ) {

					return clipArray[ i ];

				}

			}

			return null;

		},

		CreateClipsFromMorphTargetSequences: function ( morphTargets, fps, noLoop ) {

			var animationToMorphTargets = {};

			// tested with https://regex101.com/ on trick sequences
			// such flamingo_flyA_003, flamingo_run1_003, crdeath0059
			var pattern = /^([\w-]*?)([\d]+)$/;

			// sort morph target names into animation groups based
			// patterns like Walk_001, Walk_002, Run_001, Run_002
			for ( var i = 0, il = morphTargets.length; i < il; i ++ ) {

				var morphTarget = morphTargets[ i ];
				var parts = morphTarget.name.match( pattern );

				if ( parts && parts.length > 1 ) {

					var name = parts[ 1 ];

					var animationMorphTargets = animationToMorphTargets[ name ];
					if ( ! animationMorphTargets ) {

						animationToMorphTargets[ name ] = animationMorphTargets = [];

					}

					animationMorphTargets.push( morphTarget );

				}

			}

			var clips = [];

			for ( var name in animationToMorphTargets ) {

				clips.push( AnimationClip.CreateFromMorphTargetSequence( name, animationToMorphTargets[ name ], fps, noLoop ) );

			}

			return clips;

		},

		// parse the animation.hierarchy format
		parseAnimation: function ( animation, bones ) {

			if ( ! animation ) {

				console.error( 'THREE.AnimationClip: No animation in JSONLoader data.' );
				return null;

			}

			var addNonemptyTrack = function ( trackType, trackName, animationKeys, propertyName, destTracks ) {

				// only return track if there are actually keys.
				if ( animationKeys.length !== 0 ) {

					var times = [];
					var values = [];

					AnimationUtils.flattenJSON( animationKeys, times, values, propertyName );

					// empty keys are filtered out, so check again
					if ( times.length !== 0 ) {

						destTracks.push( new trackType( trackName, times, values ) );

					}

				}

			};

			var tracks = [];

			var clipName = animation.name || 'default';
			// automatic length determination in AnimationClip.
			var duration = animation.length || - 1;
			var fps = animation.fps || 30;

			var hierarchyTracks = animation.hierarchy || [];

			for ( var h = 0; h < hierarchyTracks.length; h ++ ) {

				var 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
					var morphTargetNames = {};

					for ( var k = 0; k < animationKeys.length; k ++ ) {

						if ( animationKeys[ k ].morphTargets ) {

							for ( var 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 ( var morphTargetName in morphTargetNames ) {

						var times = [];
						var values = [];

						for ( var m = 0; m !== animationKeys[ k ].morphTargets.length; ++ m ) {

							var 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 || 1.0 );

				} else {

					// ...assume skeletal animation

					var 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;

			}

			var clip = new AnimationClip( clipName, duration, tracks );

			return clip;

		}

	} );

	Object.assign( AnimationClip.prototype, {

		resetDuration: function () {

			var tracks = this.tracks, duration = 0;

			for ( var i = 0, n = tracks.length; i !== n; ++ i ) {

				var track = this.tracks[ i ];

				duration = Math.max( duration, track.times[ track.times.length - 1 ] );

			}

			this.duration = duration;

			return this;

		},

		trim: function () {

			for ( var i = 0; i < this.tracks.length; i ++ ) {

				this.tracks[ i ].trim( 0, this.duration );

			}

			return this;

		},

		validate: function () {

			var valid = true;

			for ( var i = 0; i < this.tracks.length; i ++ ) {

				valid = valid && this.tracks[ i ].validate();

			}

			return valid;

		},

		optimize: function () {

			for ( var i = 0; i < this.tracks.length; i ++ ) {

				this.tracks[ i ].optimize();

			}

			return this;

		},

		clone: function () {

			var tracks = [];

			for ( var i = 0; i < this.tracks.length; i ++ ) {

				tracks.push( this.tracks[ i ].clone() );

			}

			return new AnimationClip( this.name, this.duration, tracks );

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	var 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 = {};

		}

	};

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function LoadingManager( onLoad, onProgress, onError ) {

		var scope = this;

		var isLoading = false;
		var itemsLoaded = 0;
		var itemsTotal = 0;
		var urlModifier = undefined;
		var 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 ) {

			var index = handlers.indexOf( regex );

			if ( index !== - 1 ) {

				handlers.splice( index, 2 );

			}

			return this;

		};

		this.getHandler = function ( file ) {

			for ( var i = 0, l = handlers.length; i < l; i += 2 ) {

				var regex = handlers[ i ];
				var loader = handlers[ i + 1 ];

				if ( regex.global ) { regex.lastIndex = 0; } // see #17920

				if ( regex.test( file ) ) {

					return loader;

				}

			}

			return null;

		};

	}

	var DefaultLoadingManager = new LoadingManager();

	/**
	 * @author alteredq / http://alteredqualia.com/
	 */

	function Loader( manager ) {

		this.manager = ( manager !== undefined ) ? manager : DefaultLoadingManager;

		this.crossOrigin = 'anonymous';
		this.path = '';
		this.resourcePath = '';

	}

	Object.assign( Loader.prototype, {

		load: function ( /* url, onLoad, onProgress, onError */ ) {},

		parse: function ( /* data */ ) {},

		setCrossOrigin: function ( crossOrigin ) {

			this.crossOrigin = crossOrigin;
			return this;

		},

		setPath: function ( path ) {

			this.path = path;
			return this;

		},

		setResourcePath: function ( resourcePath ) {

			this.resourcePath = resourcePath;
			return this;

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	var loading = {};

	function FileLoader( manager ) {

		Loader.call( this, manager );

	}

	FileLoader.prototype = Object.assign( Object.create( Loader.prototype ), {

		constructor: FileLoader,

		load: function ( url, onLoad, onProgress, onError ) {

			if ( url === undefined ) { url = ''; }

			if ( this.path !== undefined ) { url = this.path + url; }

			url = this.manager.resolveURL( url );

			var scope = this;

			var cached = Cache.get( url );

			if ( cached !== undefined ) {

				scope.manager.itemStart( url );

				setTimeout( function () {

					if ( onLoad ) { onLoad( cached ); }

					scope.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;

			}

			// Check for data: URI
			var dataUriRegex = /^data:(.*?)(;base64)?,(.*)$/;
			var dataUriRegexResult = url.match( dataUriRegex );

			// Safari can not handle Data URIs through XMLHttpRequest so process manually
			if ( dataUriRegexResult ) {

				var mimeType = dataUriRegexResult[ 1 ];
				var isBase64 = !! dataUriRegexResult[ 2 ];
				var data = dataUriRegexResult[ 3 ];

				data = decodeURIComponent( data );

				if ( isBase64 ) { data = atob( data ); }

				try {

					var response;
					var responseType = ( this.responseType || '' ).toLowerCase();

					switch ( responseType ) {

						case 'arraybuffer':
						case 'blob':

							var view = new Uint8Array( data.length );

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

								view[ i ] = data.charCodeAt( i );

							}

							if ( responseType === 'blob' ) {

								response = new Blob( [ view.buffer ], { type: mimeType } );

							} else {

								response = view.buffer;

							}

							break;

						case 'document':

							var parser = new DOMParser();
							response = parser.parseFromString( data, mimeType );

							break;

						case 'json':

							response = JSON.parse( data );

							break;

						default: // 'text' or other

							response = data;

							break;

					}

					// Wait for next browser tick like standard XMLHttpRequest event dispatching does
					setTimeout( function () {

						if ( onLoad ) { onLoad( response ); }

						scope.manager.itemEnd( url );

					}, 0 );

				} catch ( error ) {

					// Wait for next browser tick like standard XMLHttpRequest event dispatching does
					setTimeout( function () {

						if ( onError ) { onError( error ); }

						scope.manager.itemError( url );
						scope.manager.itemEnd( url );

					}, 0 );

				}

			} else {

				// Initialise array for duplicate requests

				loading[ url ] = [];

				loading[ url ].push( {

					onLoad: onLoad,
					onProgress: onProgress,
					onError: onError

				} );

				var request = new XMLHttpRequest();

				request.open( 'GET', url, true );

				request.addEventListener( 'load', function ( event ) {

					var response = this.response;

					var callbacks = loading[ url ];

					delete loading[ url ];

					if ( this.status === 200 || this.status === 0 ) {

						// Some browsers return HTTP Status 0 when using non-http protocol
						// e.g. 'file://' or 'data://'. Handle as success.

						if ( this.status === 0 ) { console.warn( 'THREE.FileLoader: HTTP Status 0 received.' ); }

						// Add to cache only on HTTP success, so that we do not cache
						// error response bodies as proper responses to requests.
						Cache.add( url, response );

						for ( var i = 0, il = callbacks.length; i < il; i ++ ) {

							var callback = callbacks[ i ];
							if ( callback.onLoad ) { callback.onLoad( response ); }

						}

						scope.manager.itemEnd( url );

					} else {

						for ( var i = 0, il = callbacks.length; i < il; i ++ ) {

							var callback = callbacks[ i ];
							if ( callback.onError ) { callback.onError( event ); }

						}

						scope.manager.itemError( url );
						scope.manager.itemEnd( url );

					}

				}, false );

				request.addEventListener( 'progress', function ( event ) {

					var callbacks = loading[ url ];

					for ( var i = 0, il = callbacks.length; i < il; i ++ ) {

						var callback = callbacks[ i ];
						if ( callback.onProgress ) { callback.onProgress( event ); }

					}

				}, false );

				request.addEventListener( 'error', function ( event ) {

					var callbacks = loading[ url ];

					delete loading[ url ];

					for ( var i = 0, il = callbacks.length; i < il; i ++ ) {

						var callback = callbacks[ i ];
						if ( callback.onError ) { callback.onError( event ); }

					}

					scope.manager.itemError( url );
					scope.manager.itemEnd( url );

				}, false );

				request.addEventListener( 'abort', function ( event ) {

					var callbacks = loading[ url ];

					delete loading[ url ];

					for ( var i = 0, il = callbacks.length; i < il; i ++ ) {

						var callback = callbacks[ i ];
						if ( callback.onError ) { callback.onError( event ); }

					}

					scope.manager.itemError( url );
					scope.manager.itemEnd( url );

				}, false );

				if ( this.responseType !== undefined ) { request.responseType = this.responseType; }
				if ( this.withCredentials !== undefined ) { request.withCredentials = this.withCredentials; }

				if ( request.overrideMimeType ) { request.overrideMimeType( this.mimeType !== undefined ? this.mimeType : 'text/plain' ); }

				for ( var header in this.requestHeader ) {

					request.setRequestHeader( header, this.requestHeader[ header ] );

				}

				request.send( null );

			}

			scope.manager.itemStart( url );

			return request;

		},

		setResponseType: function ( value ) {

			this.responseType = value;
			return this;

		},

		setWithCredentials: function ( value ) {

			this.withCredentials = value;
			return this;

		},

		setMimeType: function ( value ) {

			this.mimeType = value;
			return this;

		},

		setRequestHeader: function ( value ) {

			this.requestHeader = value;
			return this;

		}

	} );

	/**
	 * @author bhouston / http://clara.io/
	 */

	function AnimationLoader( manager ) {

		Loader.call( this, manager );

	}

	AnimationLoader.prototype = Object.assign( Object.create( Loader.prototype ), {

		constructor: AnimationLoader,

		load: function ( url, onLoad, onProgress, onError ) {

			var scope = this;

			var loader = new FileLoader( scope.manager );
			loader.setPath( scope.path );
			loader.load( url, function ( text ) {

				onLoad( scope.parse( JSON.parse( text ) ) );

			}, onProgress, onError );

		},

		parse: function ( json ) {

			var animations = [];

			for ( var i = 0; i < json.length; i ++ ) {

				var clip = AnimationClip.parse( json[ i ] );

				animations.push( clip );

			}

			return animations;

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 *
	 * Abstract Base class to block based textures loader (dds, pvr, ...)
	 *
	 * Sub classes have to implement the parse() method which will be used in load().
	 */

	function CompressedTextureLoader( manager ) {

		Loader.call( this, manager );

	}

	CompressedTextureLoader.prototype = Object.assign( Object.create( Loader.prototype ), {

		constructor: CompressedTextureLoader,

		load: function ( url, onLoad, onProgress, onError ) {

			var scope = this;

			var images = [];

			var texture = new CompressedTexture();
			texture.image = images;

			var loader = new FileLoader( this.manager );
			loader.setPath( this.path );
			loader.setResponseType( 'arraybuffer' );

			function loadTexture( i ) {

				loader.load( url[ i ], function ( buffer ) {

					var 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.format = texDatas.format;
						texture.needsUpdate = true;

						if ( onLoad ) { onLoad( texture ); }

					}

				}, onProgress, onError );

			}

			if ( Array.isArray( url ) ) {

				var loaded = 0;

				for ( var 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 ) {

					var texDatas = scope.parse( buffer, true );

					if ( texDatas.isCubemap ) {

						var faces = texDatas.mipmaps.length / texDatas.mipmapCount;

						for ( var f = 0; f < faces; f ++ ) {

							images[ f ] = { mipmaps: [] };

							for ( var 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;

							}

						}

					} 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;

		}

	} );

	/**
	 * @author Nikos M. / https://github.com/foo123/
	 *
	 * 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().
	 */

	function DataTextureLoader( manager ) {

		Loader.call( this, manager );

	}

	DataTextureLoader.prototype = Object.assign( Object.create( Loader.prototype ), {

		constructor: DataTextureLoader,

		load: function ( url, onLoad, onProgress, onError ) {

			var scope = this;

			var texture = new DataTexture();

			var loader = new FileLoader( this.manager );
			loader.setResponseType( 'arraybuffer' );
			loader.setPath( this.path );
			loader.load( url, function ( buffer ) {

				var texData = scope.parse( buffer );

				if ( ! texData ) { 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.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;

				}

				texture.needsUpdate = true;

				if ( onLoad ) { onLoad( texture, texData ); }

			}, onProgress, onError );


			return texture;

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function ImageLoader( manager ) {

		Loader.call( this, manager );

	}

	ImageLoader.prototype = Object.assign( Object.create( Loader.prototype ), {

		constructor: ImageLoader,

		load: function ( url, onLoad, onProgress, onError ) {

			if ( this.path !== undefined ) { url = this.path + url; }

			url = this.manager.resolveURL( url );

			var scope = this;

			var cached = Cache.get( url );

			if ( cached !== undefined ) {

				scope.manager.itemStart( url );

				setTimeout( function () {

					if ( onLoad ) { onLoad( cached ); }

					scope.manager.itemEnd( url );

				}, 0 );

				return cached;

			}

			var image = document.createElementNS( 'http://www.w3.org/1999/xhtml', 'img' );

			function onImageLoad() {

				image.removeEventListener( 'load', onImageLoad, false );
				image.removeEventListener( 'error', onImageError, false );

				Cache.add( url, this );

				if ( onLoad ) { onLoad( this ); }

				scope.manager.itemEnd( url );

			}

			function onImageError( event ) {

				image.removeEventListener( 'load', onImageLoad, false );
				image.removeEventListener( 'error', onImageError, false );

				if ( onError ) { onError( event ); }

				scope.manager.itemError( url );
				scope.manager.itemEnd( url );

			}

			image.addEventListener( 'load', onImageLoad, false );
			image.addEventListener( 'error', onImageError, false );

			if ( url.substr( 0, 5 ) !== 'data:' ) {

				if ( this.crossOrigin !== undefined ) { image.crossOrigin = this.crossOrigin; }

			}

			scope.manager.itemStart( url );

			image.src = url;

			return image;

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */


	function CubeTextureLoader( manager ) {

		Loader.call( this, manager );

	}

	CubeTextureLoader.prototype = Object.assign( Object.create( Loader.prototype ), {

		constructor: CubeTextureLoader,

		load: function ( urls, onLoad, onProgress, onError ) {

			var texture = new CubeTexture();

			var loader = new ImageLoader( this.manager );
			loader.setCrossOrigin( this.crossOrigin );
			loader.setPath( this.path );

			var 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 ( var i = 0; i < urls.length; ++ i ) {

				loadTexture( i );

			}

			return texture;

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function TextureLoader( manager ) {

		Loader.call( this, manager );

	}

	TextureLoader.prototype = Object.assign( Object.create( Loader.prototype ), {

		constructor: TextureLoader,

		load: function ( url, onLoad, onProgress, onError ) {

			var texture = new Texture();

			var loader = new ImageLoader( this.manager );
			loader.setCrossOrigin( this.crossOrigin );
			loader.setPath( this.path );

			loader.load( url, function ( image ) {

				texture.image = image;

				// JPEGs can't have an alpha channel, so memory can be saved by storing them as RGB.
				var isJPEG = url.search( /\.jpe?g($|\?)/i ) > 0 || url.search( /^data\:image\/jpeg/ ) === 0;

				texture.format = isJPEG ? RGBFormat : RGBAFormat;
				texture.needsUpdate = true;

				if ( onLoad !== undefined ) {

					onLoad( texture );

				}

			}, onProgress, onError );

			return texture;

		}

	} );

	/**
	 * @author zz85 / http://www.lab4games.net/zz85/blog
	 * Extensible curve object
	 *
	 * Some common of curve methods:
	 * .getPoint( t, optionalTarget ), .getTangent( t )
	 * .getPointAt( u, optionalTarget ), .getTangentAt( u )
	 * .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.
	 *
	 **/

	/**************************************************************
	 *	Abstract Curve base class
	 **************************************************************/

	function Curve() {

		this.type = 'Curve';

		this.arcLengthDivisions = 200;

	}

	Object.assign( Curve.prototype, {

		// Virtual base class method to overwrite and implement in subclasses
		//	- t [0 .. 1]

		getPoint: function ( /* 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: function ( u, optionalTarget ) {

			var t = this.getUtoTmapping( u );
			return this.getPoint( t, optionalTarget );

		},

		// Get sequence of points using getPoint( t )

		getPoints: function ( divisions ) {

			if ( divisions === undefined ) { divisions = 5; }

			var points = [];

			for ( var d = 0; d <= divisions; d ++ ) {

				points.push( this.getPoint( d / divisions ) );

			}

			return points;

		},

		// Get sequence of points using getPointAt( u )

		getSpacedPoints: function ( divisions ) {

			if ( divisions === undefined ) { divisions = 5; }

			var points = [];

			for ( var d = 0; d <= divisions; d ++ ) {

				points.push( this.getPointAt( d / divisions ) );

			}

			return points;

		},

		// Get total curve arc length

		getLength: function () {

			var lengths = this.getLengths();
			return lengths[ lengths.length - 1 ];

		},

		// Get list of cumulative segment lengths

		getLengths: function ( divisions ) {

			if ( divisions === undefined ) { divisions = this.arcLengthDivisions; }

			if ( this.cacheArcLengths &&
				( this.cacheArcLengths.length === divisions + 1 ) &&
				! this.needsUpdate ) {

				return this.cacheArcLengths;

			}

			this.needsUpdate = false;

			var cache = [];
			var current, last = this.getPoint( 0 );
			var p, sum = 0;

			cache.push( 0 );

			for ( 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: function () {

			this.needsUpdate = true;
			this.getLengths();

		},

		// Given u ( 0 .. 1 ), get a t to find p. This gives you points which are equidistant

		getUtoTmapping: function ( u, distance ) {

			var arcLengths = this.getLengths();

			var i = 0, il = arcLengths.length;

			var 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

			var 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

			var lengthBefore = arcLengths[ i ];
			var lengthAfter = arcLengths[ i + 1 ];

			var segmentLength = lengthAfter - lengthBefore;

			// determine where we are between the 'before' and 'after' points

			var segmentFraction = ( targetArcLength - lengthBefore ) / segmentLength;

			// add that fractional amount to t

			var 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: function ( t ) {

			var delta = 0.0001;
			var t1 = t - delta;
			var t2 = t + delta;

			// Capping in case of danger

			if ( t1 < 0 ) { t1 = 0; }
			if ( t2 > 1 ) { t2 = 1; }

			var pt1 = this.getPoint( t1 );
			var pt2 = this.getPoint( t2 );

			var vec = pt2.clone().sub( pt1 );
			return vec.normalize();

		},

		getTangentAt: function ( u ) {

			var t = this.getUtoTmapping( u );
			return this.getTangent( t );

		},

		computeFrenetFrames: function ( segments, closed ) {

			// see http://www.cs.indiana.edu/pub/techreports/TR425.pdf

			var normal = new Vector3();

			var tangents = [];
			var normals = [];
			var binormals = [];

			var vec = new Vector3();
			var mat = new Matrix4();

			var i, u, theta;

			// compute the tangent vectors for each segment on the curve

			for ( i = 0; i <= segments; i ++ ) {

				u = i / segments;

				tangents[ i ] = this.getTangentAt( u );
				tangents[ i ].normalize();

			}

			// 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();
			var min = Number.MAX_VALUE;
			var tx = Math.abs( tangents[ 0 ].x );
			var ty = Math.abs( tangents[ 0 ].y );
			var 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 ( 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();

					theta = Math.acos( MathUtils.clamp( 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 ) {

				theta = Math.acos( MathUtils.clamp( normals[ 0 ].dot( normals[ segments ] ), - 1, 1 ) );
				theta /= segments;

				if ( tangents[ 0 ].dot( vec.crossVectors( normals[ 0 ], normals[ segments ] ) ) > 0 ) {

					theta = - theta;

				}

				for ( 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: function () {

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

		},

		copy: function ( source ) {

			this.arcLengthDivisions = source.arcLengthDivisions;

			return this;

		},

		toJSON: function () {

			var data = {
				metadata: {
					version: 4.5,
					type: 'Curve',
					generator: 'Curve.toJSON'
				}
			};

			data.arcLengthDivisions = this.arcLengthDivisions;
			data.type = this.type;

			return data;

		},

		fromJSON: function ( json ) {

			this.arcLengthDivisions = json.arcLengthDivisions;

			return this;

		}

	} );

	function EllipseCurve( aX, aY, xRadius, yRadius, aStartAngle, aEndAngle, aClockwise, aRotation ) {

		Curve.call( this );

		this.type = 'EllipseCurve';

		this.aX = aX || 0;
		this.aY = aY || 0;

		this.xRadius = xRadius || 1;
		this.yRadius = yRadius || 1;

		this.aStartAngle = aStartAngle || 0;
		this.aEndAngle = aEndAngle || 2 * Math.PI;

		this.aClockwise = aClockwise || false;

		this.aRotation = aRotation || 0;

	}

	EllipseCurve.prototype = Object.create( Curve.prototype );
	EllipseCurve.prototype.constructor = EllipseCurve;

	EllipseCurve.prototype.isEllipseCurve = true;

	EllipseCurve.prototype.getPoint = function ( t, optionalTarget ) {

		var point = optionalTarget || new Vector2();

		var twoPi = Math.PI * 2;
		var deltaAngle = this.aEndAngle - this.aStartAngle;
		var 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;

			}

		}

		var angle = this.aStartAngle + t * deltaAngle;
		var x = this.aX + this.xRadius * Math.cos( angle );
		var y = this.aY + this.yRadius * Math.sin( angle );

		if ( this.aRotation !== 0 ) {

			var cos = Math.cos( this.aRotation );
			var sin = Math.sin( this.aRotation );

			var tx = x - this.aX;
			var 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 );

	};

	EllipseCurve.prototype.copy = function ( source ) {

		Curve.prototype.copy.call( this, 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;

	};


	EllipseCurve.prototype.toJSON = function () {

		var data = Curve.prototype.toJSON.call( this );

		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;

	};

	EllipseCurve.prototype.fromJSON = function ( json ) {

		Curve.prototype.fromJSON.call( this, 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;

	};

	function ArcCurve( aX, aY, aRadius, aStartAngle, aEndAngle, aClockwise ) {

		EllipseCurve.call( this, aX, aY, aRadius, aRadius, aStartAngle, aEndAngle, aClockwise );

		this.type = 'ArcCurve';

	}

	ArcCurve.prototype = Object.create( EllipseCurve.prototype );
	ArcCurve.prototype.constructor = ArcCurve;

	ArcCurve.prototype.isArcCurve = true;

	/**
	 * @author zz85 https://github.com/zz85
	 *
	 * 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() {

		var 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]
				var t1 = ( x1 - x0 ) / dt0 - ( x2 - x0 ) / ( dt0 + dt1 ) + ( x2 - x1 ) / dt1;
				var 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 ) {

				var t2 = t * t;
				var t3 = t2 * t;
				return c0 + c1 * t + c2 * t2 + c3 * t3;

			}

		};

	}

	//

	var tmp = new Vector3();
	var px = new CubicPoly(), py = new CubicPoly(), pz = new CubicPoly();

	function CatmullRomCurve3( points, closed, curveType, tension ) {

		Curve.call( this );

		this.type = 'CatmullRomCurve3';

		this.points = points || [];
		this.closed = closed || false;
		this.curveType = curveType || 'centripetal';
		this.tension = tension || 0.5;

	}

	CatmullRomCurve3.prototype = Object.create( Curve.prototype );
	CatmullRomCurve3.prototype.constructor = CatmullRomCurve3;

	CatmullRomCurve3.prototype.isCatmullRomCurve3 = true;

	CatmullRomCurve3.prototype.getPoint = function ( t, optionalTarget ) {

		var point = optionalTarget || new Vector3();

		var points = this.points;
		var l = points.length;

		var p = ( l - ( this.closed ? 0 : 1 ) ) * t;
		var intPoint = Math.floor( p );
		var 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;

		}

		var p0, p1, p2, p3; // 4 points

		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;

		}

		p1 = points[ intPoint % l ];
		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
			var pow = this.curveType === 'chordal' ? 0.5 : 0.25;
			var dt0 = Math.pow( p0.distanceToSquared( p1 ), pow );
			var dt1 = Math.pow( p1.distanceToSquared( p2 ), pow );
			var 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;

	};

	CatmullRomCurve3.prototype.copy = function ( source ) {

		Curve.prototype.copy.call( this, source );

		this.points = [];

		for ( var i = 0, l = source.points.length; i < l; i ++ ) {

			var point = source.points[ i ];

			this.points.push( point.clone() );

		}

		this.closed = source.closed;
		this.curveType = source.curveType;
		this.tension = source.tension;

		return this;

	};

	CatmullRomCurve3.prototype.toJSON = function () {

		var data = Curve.prototype.toJSON.call( this );

		data.points = [];

		for ( var i = 0, l = this.points.length; i < l; i ++ ) {

			var point = this.points[ i ];
			data.points.push( point.toArray() );

		}

		data.closed = this.closed;
		data.curveType = this.curveType;
		data.tension = this.tension;

		return data;

	};

	CatmullRomCurve3.prototype.fromJSON = function ( json ) {

		Curve.prototype.fromJSON.call( this, json );

		this.points = [];

		for ( var i = 0, l = json.points.length; i < l; i ++ ) {

			var 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;

	};

	/**
	 * @author zz85 / http://www.lab4games.net/zz85/blog
	 *
	 * Bezier Curves formulas obtained from
	 * http://en.wikipedia.org/wiki/Bézier_curve
	 */

	function CatmullRom( t, p0, p1, p2, p3 ) {

		var v0 = ( p2 - p0 ) * 0.5;
		var v1 = ( p3 - p1 ) * 0.5;
		var t2 = t * t;
		var 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 ) {

		var 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 ) {

		var k = 1 - t;
		return k * k * k * p;

	}

	function CubicBezierP1( t, p ) {

		var 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 );

	}

	function CubicBezierCurve( v0, v1, v2, v3 ) {

		Curve.call( this );

		this.type = 'CubicBezierCurve';

		this.v0 = v0 || new Vector2();
		this.v1 = v1 || new Vector2();
		this.v2 = v2 || new Vector2();
		this.v3 = v3 || new Vector2();

	}

	CubicBezierCurve.prototype = Object.create( Curve.prototype );
	CubicBezierCurve.prototype.constructor = CubicBezierCurve;

	CubicBezierCurve.prototype.isCubicBezierCurve = true;

	CubicBezierCurve.prototype.getPoint = function ( t, optionalTarget ) {

		var point = optionalTarget || new Vector2();

		var 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;

	};

	CubicBezierCurve.prototype.copy = function ( source ) {

		Curve.prototype.copy.call( this, source );

		this.v0.copy( source.v0 );
		this.v1.copy( source.v1 );
		this.v2.copy( source.v2 );
		this.v3.copy( source.v3 );

		return this;

	};

	CubicBezierCurve.prototype.toJSON = function () {

		var data = Curve.prototype.toJSON.call( this );

		data.v0 = this.v0.toArray();
		data.v1 = this.v1.toArray();
		data.v2 = this.v2.toArray();
		data.v3 = this.v3.toArray();

		return data;

	};

	CubicBezierCurve.prototype.fromJSON = function ( json ) {

		Curve.prototype.fromJSON.call( this, json );

		this.v0.fromArray( json.v0 );
		this.v1.fromArray( json.v1 );
		this.v2.fromArray( json.v2 );
		this.v3.fromArray( json.v3 );

		return this;

	};

	function CubicBezierCurve3( v0, v1, v2, v3 ) {

		Curve.call( this );

		this.type = 'CubicBezierCurve3';

		this.v0 = v0 || new Vector3();
		this.v1 = v1 || new Vector3();
		this.v2 = v2 || new Vector3();
		this.v3 = v3 || new Vector3();

	}

	CubicBezierCurve3.prototype = Object.create( Curve.prototype );
	CubicBezierCurve3.prototype.constructor = CubicBezierCurve3;

	CubicBezierCurve3.prototype.isCubicBezierCurve3 = true;

	CubicBezierCurve3.prototype.getPoint = function ( t, optionalTarget ) {

		var point = optionalTarget || new Vector3();

		var 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;

	};

	CubicBezierCurve3.prototype.copy = function ( source ) {

		Curve.prototype.copy.call( this, source );

		this.v0.copy( source.v0 );
		this.v1.copy( source.v1 );
		this.v2.copy( source.v2 );
		this.v3.copy( source.v3 );

		return this;

	};

	CubicBezierCurve3.prototype.toJSON = function () {

		var data = Curve.prototype.toJSON.call( this );

		data.v0 = this.v0.toArray();
		data.v1 = this.v1.toArray();
		data.v2 = this.v2.toArray();
		data.v3 = this.v3.toArray();

		return data;

	};

	CubicBezierCurve3.prototype.fromJSON = function ( json ) {

		Curve.prototype.fromJSON.call( this, json );

		this.v0.fromArray( json.v0 );
		this.v1.fromArray( json.v1 );
		this.v2.fromArray( json.v2 );
		this.v3.fromArray( json.v3 );

		return this;

	};

	function LineCurve( v1, v2 ) {

		Curve.call( this );

		this.type = 'LineCurve';

		this.v1 = v1 || new Vector2();
		this.v2 = v2 || new Vector2();

	}

	LineCurve.prototype = Object.create( Curve.prototype );
	LineCurve.prototype.constructor = LineCurve;

	LineCurve.prototype.isLineCurve = true;

	LineCurve.prototype.getPoint = function ( t, optionalTarget ) {

		var point = optionalTarget || new Vector2();

		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

	LineCurve.prototype.getPointAt = function ( u, optionalTarget ) {

		return this.getPoint( u, optionalTarget );

	};

	LineCurve.prototype.getTangent = function ( /* t */ ) {

		var tangent = this.v2.clone().sub( this.v1 );

		return tangent.normalize();

	};

	LineCurve.prototype.copy = function ( source ) {

		Curve.prototype.copy.call( this, source );

		this.v1.copy( source.v1 );
		this.v2.copy( source.v2 );

		return this;

	};

	LineCurve.prototype.toJSON = function () {

		var data = Curve.prototype.toJSON.call( this );

		data.v1 = this.v1.toArray();
		data.v2 = this.v2.toArray();

		return data;

	};

	LineCurve.prototype.fromJSON = function ( json ) {

		Curve.prototype.fromJSON.call( this, json );

		this.v1.fromArray( json.v1 );
		this.v2.fromArray( json.v2 );

		return this;

	};

	function LineCurve3( v1, v2 ) {

		Curve.call( this );

		this.type = 'LineCurve3';

		this.v1 = v1 || new Vector3();
		this.v2 = v2 || new Vector3();

	}

	LineCurve3.prototype = Object.create( Curve.prototype );
	LineCurve3.prototype.constructor = LineCurve3;

	LineCurve3.prototype.isLineCurve3 = true;

	LineCurve3.prototype.getPoint = function ( t, optionalTarget ) {

		var point = optionalTarget || new Vector3();

		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

	LineCurve3.prototype.getPointAt = function ( u, optionalTarget ) {

		return this.getPoint( u, optionalTarget );

	};

	LineCurve3.prototype.copy = function ( source ) {

		Curve.prototype.copy.call( this, source );

		this.v1.copy( source.v1 );
		this.v2.copy( source.v2 );

		return this;

	};

	LineCurve3.prototype.toJSON = function () {

		var data = Curve.prototype.toJSON.call( this );

		data.v1 = this.v1.toArray();
		data.v2 = this.v2.toArray();

		return data;

	};

	LineCurve3.prototype.fromJSON = function ( json ) {

		Curve.prototype.fromJSON.call( this, json );

		this.v1.fromArray( json.v1 );
		this.v2.fromArray( json.v2 );

		return this;

	};

	function QuadraticBezierCurve( v0, v1, v2 ) {

		Curve.call( this );

		this.type = 'QuadraticBezierCurve';

		this.v0 = v0 || new Vector2();
		this.v1 = v1 || new Vector2();
		this.v2 = v2 || new Vector2();

	}

	QuadraticBezierCurve.prototype = Object.create( Curve.prototype );
	QuadraticBezierCurve.prototype.constructor = QuadraticBezierCurve;

	QuadraticBezierCurve.prototype.isQuadraticBezierCurve = true;

	QuadraticBezierCurve.prototype.getPoint = function ( t, optionalTarget ) {

		var point = optionalTarget || new Vector2();

		var 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;

	};

	QuadraticBezierCurve.prototype.copy = function ( source ) {

		Curve.prototype.copy.call( this, source );

		this.v0.copy( source.v0 );
		this.v1.copy( source.v1 );
		this.v2.copy( source.v2 );

		return this;

	};

	QuadraticBezierCurve.prototype.toJSON = function () {

		var data = Curve.prototype.toJSON.call( this );

		data.v0 = this.v0.toArray();
		data.v1 = this.v1.toArray();
		data.v2 = this.v2.toArray();

		return data;

	};

	QuadraticBezierCurve.prototype.fromJSON = function ( json ) {

		Curve.prototype.fromJSON.call( this, json );

		this.v0.fromArray( json.v0 );
		this.v1.fromArray( json.v1 );
		this.v2.fromArray( json.v2 );

		return this;

	};

	function QuadraticBezierCurve3( v0, v1, v2 ) {

		Curve.call( this );

		this.type = 'QuadraticBezierCurve3';

		this.v0 = v0 || new Vector3();
		this.v1 = v1 || new Vector3();
		this.v2 = v2 || new Vector3();

	}

	QuadraticBezierCurve3.prototype = Object.create( Curve.prototype );
	QuadraticBezierCurve3.prototype.constructor = QuadraticBezierCurve3;

	QuadraticBezierCurve3.prototype.isQuadraticBezierCurve3 = true;

	QuadraticBezierCurve3.prototype.getPoint = function ( t, optionalTarget ) {

		var point = optionalTarget || new Vector3();

		var 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;

	};

	QuadraticBezierCurve3.prototype.copy = function ( source ) {

		Curve.prototype.copy.call( this, source );

		this.v0.copy( source.v0 );
		this.v1.copy( source.v1 );
		this.v2.copy( source.v2 );

		return this;

	};

	QuadraticBezierCurve3.prototype.toJSON = function () {

		var data = Curve.prototype.toJSON.call( this );

		data.v0 = this.v0.toArray();
		data.v1 = this.v1.toArray();
		data.v2 = this.v2.toArray();

		return data;

	};

	QuadraticBezierCurve3.prototype.fromJSON = function ( json ) {

		Curve.prototype.fromJSON.call( this, json );

		this.v0.fromArray( json.v0 );
		this.v1.fromArray( json.v1 );
		this.v2.fromArray( json.v2 );

		return this;

	};

	function SplineCurve( points /* array of Vector2 */ ) {

		Curve.call( this );

		this.type = 'SplineCurve';

		this.points = points || [];

	}

	SplineCurve.prototype = Object.create( Curve.prototype );
	SplineCurve.prototype.constructor = SplineCurve;

	SplineCurve.prototype.isSplineCurve = true;

	SplineCurve.prototype.getPoint = function ( t, optionalTarget ) {

		var point = optionalTarget || new Vector2();

		var points = this.points;
		var p = ( points.length - 1 ) * t;

		var intPoint = Math.floor( p );
		var weight = p - intPoint;

		var p0 = points[ intPoint === 0 ? intPoint : intPoint - 1 ];
		var p1 = points[ intPoint ];
		var p2 = points[ intPoint > points.length - 2 ? points.length - 1 : intPoint + 1 ];
		var 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;

	};

	SplineCurve.prototype.copy = function ( source ) {

		Curve.prototype.copy.call( this, source );

		this.points = [];

		for ( var i = 0, l = source.points.length; i < l; i ++ ) {

			var point = source.points[ i ];

			this.points.push( point.clone() );

		}

		return this;

	};

	SplineCurve.prototype.toJSON = function () {

		var data = Curve.prototype.toJSON.call( this );

		data.points = [];

		for ( var i = 0, l = this.points.length; i < l; i ++ ) {

			var point = this.points[ i ];
			data.points.push( point.toArray() );

		}

		return data;

	};

	SplineCurve.prototype.fromJSON = function ( json ) {

		Curve.prototype.fromJSON.call( this, json );

		this.points = [];

		for ( var i = 0, l = json.points.length; i < l; i ++ ) {

			var 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
	});

	/**
	 * @author zz85 / http://www.lab4games.net/zz85/blog
	 *
	 **/

	/**************************************************************
	 *	Curved Path - a curve path is simply a array of connected
	 *  curves, but retains the api of a curve
	 **************************************************************/

	function CurvePath() {

		Curve.call( this );

		this.type = 'CurvePath';

		this.curves = [];
		this.autoClose = false; // Automatically closes the path

	}

	CurvePath.prototype = Object.assign( Object.create( Curve.prototype ), {

		constructor: CurvePath,

		add: function ( curve ) {

			this.curves.push( curve );

		},

		closePath: function () {

			// Add a line curve if start and end of lines are not connected
			var startPoint = this.curves[ 0 ].getPoint( 0 );
			var endPoint = this.curves[ this.curves.length - 1 ].getPoint( 1 );

			if ( ! startPoint.equals( endPoint ) ) {

				this.curves.push( new LineCurve( endPoint, startPoint ) );

			}

		},

		// 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: function ( t ) {

			var d = t * this.getLength();
			var curveLengths = this.getCurveLengths();
			var i = 0;

			// To think about boundaries points.

			while ( i < curveLengths.length ) {

				if ( curveLengths[ i ] >= d ) {

					var diff = curveLengths[ i ] - d;
					var curve = this.curves[ i ];

					var segmentLength = curve.getLength();
					var u = segmentLength === 0 ? 0 : 1 - diff / segmentLength;

					return curve.getPointAt( u );

				}

				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: function () {

			var lens = this.getCurveLengths();
			return lens[ lens.length - 1 ];

		},

		// cacheLengths must be recalculated.
		updateArcLengths: function () {

			this.needsUpdate = true;
			this.cacheLengths = null;
			this.getCurveLengths();

		},

		// Compute lengths and cache them
		// We cannot overwrite getLengths() because UtoT mapping uses it.

		getCurveLengths: function () {

			// 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

			var lengths = [], sums = 0;

			for ( var i = 0, l = this.curves.length; i < l; i ++ ) {

				sums += this.curves[ i ].getLength();
				lengths.push( sums );

			}

			this.cacheLengths = lengths;

			return lengths;

		},

		getSpacedPoints: function ( divisions ) {

			if ( divisions === undefined ) { divisions = 40; }

			var points = [];

			for ( var i = 0; i <= divisions; i ++ ) {

				points.push( this.getPoint( i / divisions ) );

			}

			if ( this.autoClose ) {

				points.push( points[ 0 ] );

			}

			return points;

		},

		getPoints: function ( divisions ) {

			divisions = divisions || 12;

			var points = [], last;

			for ( var i = 0, curves = this.curves; i < curves.length; i ++ ) {

				var curve = curves[ i ];
				var resolution = ( curve && curve.isEllipseCurve ) ? divisions * 2
					: ( curve && ( curve.isLineCurve || curve.isLineCurve3 ) ) ? 1
						: ( curve && curve.isSplineCurve ) ? divisions * curve.points.length
							: divisions;

				var pts = curve.getPoints( resolution );

				for ( var j = 0; j < pts.length; j ++ ) {

					var 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: function ( source ) {

			Curve.prototype.copy.call( this, source );

			this.curves = [];

			for ( var i = 0, l = source.curves.length; i < l; i ++ ) {

				var curve = source.curves[ i ];

				this.curves.push( curve.clone() );

			}

			this.autoClose = source.autoClose;

			return this;

		},

		toJSON: function () {

			var data = Curve.prototype.toJSON.call( this );

			data.autoClose = this.autoClose;
			data.curves = [];

			for ( var i = 0, l = this.curves.length; i < l; i ++ ) {

				var curve = this.curves[ i ];
				data.curves.push( curve.toJSON() );

			}

			return data;

		},

		fromJSON: function ( json ) {

			Curve.prototype.fromJSON.call( this, json );

			this.autoClose = json.autoClose;
			this.curves = [];

			for ( var i = 0, l = json.curves.length; i < l; i ++ ) {

				var curve = json.curves[ i ];
				this.curves.push( new Curves[ curve.type ]().fromJSON( curve ) );

			}

			return this;

		}

	} );

	/**
	 * @author zz85 / http://www.lab4games.net/zz85/blog
	 * Creates free form 2d path using series of points, lines or curves.
	 **/

	function Path( points ) {

		CurvePath.call( this );

		this.type = 'Path';

		this.currentPoint = new Vector2();

		if ( points ) {

			this.setFromPoints( points );

		}

	}

	Path.prototype = Object.assign( Object.create( CurvePath.prototype ), {

		constructor: Path,

		setFromPoints: function ( points ) {

			this.moveTo( points[ 0 ].x, points[ 0 ].y );

			for ( var i = 1, l = points.length; i < l; i ++ ) {

				this.lineTo( points[ i ].x, points[ i ].y );

			}

			return this;

		},

		moveTo: function ( x, y ) {

			this.currentPoint.set( x, y ); // TODO consider referencing vectors instead of copying?

			return this;

		},

		lineTo: function ( x, y ) {

			var curve = new LineCurve( this.currentPoint.clone(), new Vector2( x, y ) );
			this.curves.push( curve );

			this.currentPoint.set( x, y );

			return this;

		},

		quadraticCurveTo: function ( aCPx, aCPy, aX, aY ) {

			var 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: function ( aCP1x, aCP1y, aCP2x, aCP2y, aX, aY ) {

			var 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: function ( pts /*Array of Vector*/ ) {

			var npts = [ this.currentPoint.clone() ].concat( pts );

			var curve = new SplineCurve( npts );
			this.curves.push( curve );

			this.currentPoint.copy( pts[ pts.length - 1 ] );

			return this;

		},

		arc: function ( aX, aY, aRadius, aStartAngle, aEndAngle, aClockwise ) {

			var x0 = this.currentPoint.x;
			var y0 = this.currentPoint.y;

			this.absarc( aX + x0, aY + y0, aRadius,
				aStartAngle, aEndAngle, aClockwise );

			return this;

		},

		absarc: function ( aX, aY, aRadius, aStartAngle, aEndAngle, aClockwise ) {

			this.absellipse( aX, aY, aRadius, aRadius, aStartAngle, aEndAngle, aClockwise );

			return this;

		},

		ellipse: function ( aX, aY, xRadius, yRadius, aStartAngle, aEndAngle, aClockwise, aRotation ) {

			var x0 = this.currentPoint.x;
			var y0 = this.currentPoint.y;

			this.absellipse( aX + x0, aY + y0, xRadius, yRadius, aStartAngle, aEndAngle, aClockwise, aRotation );

			return this;

		},

		absellipse: function ( aX, aY, xRadius, yRadius, aStartAngle, aEndAngle, aClockwise, aRotation ) {

			var 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
				var firstPoint = curve.getPoint( 0 );

				if ( ! firstPoint.equals( this.currentPoint ) ) {

					this.lineTo( firstPoint.x, firstPoint.y );

				}

			}

			this.curves.push( curve );

			var lastPoint = curve.getPoint( 1 );
			this.currentPoint.copy( lastPoint );

			return this;

		},

		copy: function ( source ) {

			CurvePath.prototype.copy.call( this, source );

			this.currentPoint.copy( source.currentPoint );

			return this;

		},

		toJSON: function () {

			var data = CurvePath.prototype.toJSON.call( this );

			data.currentPoint = this.currentPoint.toArray();

			return data;

		},

		fromJSON: function ( json ) {

			CurvePath.prototype.fromJSON.call( this, json );

			this.currentPoint.fromArray( json.currentPoint );

			return this;

		}

	} );

	/**
	 * @author zz85 / http://www.lab4games.net/zz85/blog
	 * Defines a 2d shape plane using paths.
	 **/

	// STEP 1 Create a path.
	// STEP 2 Turn path into shape.
	// STEP 3 ExtrudeGeometry takes in Shape/Shapes
	// STEP 3a - Extract points from each shape, turn to vertices
	// STEP 3b - Triangulate each shape, add faces.

	function Shape( points ) {

		Path.call( this, points );

		this.uuid = MathUtils.generateUUID();

		this.type = 'Shape';

		this.holes = [];

	}

	Shape.prototype = Object.assign( Object.create( Path.prototype ), {

		constructor: Shape,

		getPointsHoles: function ( divisions ) {

			var holesPts = [];

			for ( var 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: function ( divisions ) {

			return {

				shape: this.getPoints( divisions ),
				holes: this.getPointsHoles( divisions )

			};

		},

		copy: function ( source ) {

			Path.prototype.copy.call( this, source );

			this.holes = [];

			for ( var i = 0, l = source.holes.length; i < l; i ++ ) {

				var hole = source.holes[ i ];

				this.holes.push( hole.clone() );

			}

			return this;

		},

		toJSON: function () {

			var data = Path.prototype.toJSON.call( this );

			data.uuid = this.uuid;
			data.holes = [];

			for ( var i = 0, l = this.holes.length; i < l; i ++ ) {

				var hole = this.holes[ i ];
				data.holes.push( hole.toJSON() );

			}

			return data;

		},

		fromJSON: function ( json ) {

			Path.prototype.fromJSON.call( this, json );

			this.uuid = json.uuid;
			this.holes = [];

			for ( var i = 0, l = json.holes.length; i < l; i ++ ) {

				var hole = json.holes[ i ];
				this.holes.push( new Path().fromJSON( hole ) );

			}

			return this;

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author alteredq / http://alteredqualia.com/
	 */

	function Light( color, intensity ) {

		Object3D.call( this );

		this.type = 'Light';

		this.color = new Color( color );
		this.intensity = intensity !== undefined ? intensity : 1;

		this.receiveShadow = undefined;

	}

	Light.prototype = Object.assign( Object.create( Object3D.prototype ), {

		constructor: Light,

		isLight: true,

		copy: function ( source ) {

			Object3D.prototype.copy.call( this, source );

			this.color.copy( source.color );
			this.intensity = source.intensity;

			return this;

		},

		toJSON: function ( meta ) {

			var data = Object3D.prototype.toJSON.call( this, 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(); }

			return data;

		}

	} );

	/**
	 * @author alteredq / http://alteredqualia.com/
	 */

	function HemisphereLight( skyColor, groundColor, intensity ) {

		Light.call( this, skyColor, intensity );

		this.type = 'HemisphereLight';

		this.castShadow = undefined;

		this.position.copy( Object3D.DefaultUp );
		this.updateMatrix();

		this.groundColor = new Color( groundColor );

	}

	HemisphereLight.prototype = Object.assign( Object.create( Light.prototype ), {

		constructor: HemisphereLight,

		isHemisphereLight: true,

		copy: function ( source ) {

			Light.prototype.copy.call( this, source );

			this.groundColor.copy( source.groundColor );

			return this;

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function LightShadow( camera ) {

		this.camera = camera;

		this.bias = 0;
		this.radius = 1;

		this.mapSize = new Vector2( 512, 512 );

		this.map = null;
		this.mapPass = null;
		this.matrix = new Matrix4();

		this._frustum = new Frustum();
		this._frameExtents = new Vector2( 1, 1 );

		this._viewportCount = 1;

		this._viewports = [

			new Vector4( 0, 0, 1, 1 )

		];

	}

	Object.assign( LightShadow.prototype, {

		_projScreenMatrix: new Matrix4(),

		_lightPositionWorld: new Vector3(),

		_lookTarget: new Vector3(),

		getViewportCount: function () {

			return this._viewportCount;

		},

		getFrustum: function () {

			return this._frustum;

		},

		updateMatrices: function ( light ) {

			var shadowCamera = this.camera,
				shadowMatrix = this.matrix,
				projScreenMatrix = this._projScreenMatrix,
				lookTarget = this._lookTarget,
				lightPositionWorld = this._lightPositionWorld;

			lightPositionWorld.setFromMatrixPosition( light.matrixWorld );
			shadowCamera.position.copy( lightPositionWorld );

			lookTarget.setFromMatrixPosition( light.target.matrixWorld );
			shadowCamera.lookAt( lookTarget );
			shadowCamera.updateMatrixWorld();

			projScreenMatrix.multiplyMatrices( shadowCamera.projectionMatrix, shadowCamera.matrixWorldInverse );
			this._frustum.setFromProjectionMatrix( projScreenMatrix );

			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( shadowCamera.projectionMatrix );
			shadowMatrix.multiply( shadowCamera.matrixWorldInverse );

		},

		getViewport: function ( viewportIndex ) {

			return this._viewports[ viewportIndex ];

		},

		getFrameExtents: function () {

			return this._frameExtents;

		},

		copy: function ( source ) {

			this.camera = source.camera.clone();

			this.bias = source.bias;
			this.radius = source.radius;

			this.mapSize.copy( source.mapSize );

			return this;

		},

		clone: function () {

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

		},

		toJSON: function () {

			var object = {};

			if ( this.bias !== 0 ) { object.bias = this.bias; }
			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;

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function SpotLightShadow() {

		LightShadow.call( this, new PerspectiveCamera( 50, 1, 0.5, 500 ) );

	}

	SpotLightShadow.prototype = Object.assign( Object.create( LightShadow.prototype ), {

		constructor: SpotLightShadow,

		isSpotLightShadow: true,

		updateMatrices: function ( light ) {

			var camera = this.camera;

			var fov = MathUtils.RAD2DEG * 2 * light.angle;
			var aspect = this.mapSize.width / this.mapSize.height;
			var 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();

			}

			LightShadow.prototype.updateMatrices.call( this, light );

		}

	} );

	/**
	 * @author alteredq / http://alteredqualia.com/
	 */

	function SpotLight( color, intensity, distance, angle, penumbra, decay ) {

		Light.call( this, color, intensity );

		this.type = 'SpotLight';

		this.position.copy( Object3D.DefaultUp );
		this.updateMatrix();

		this.target = new Object3D();

		Object.defineProperty( this, 'power', {
			get: function () {

				// intensity = power per solid angle.
				// ref: equation (17) from https://seblagarde.files.wordpress.com/2015/07/course_notes_moving_frostbite_to_pbr_v32.pdf
				return this.intensity * Math.PI;

			},
			set: function ( power ) {

				// intensity = power per solid angle.
				// ref: equation (17) from https://seblagarde.files.wordpress.com/2015/07/course_notes_moving_frostbite_to_pbr_v32.pdf
				this.intensity = power / Math.PI;

			}
		} );

		this.distance = ( distance !== undefined ) ? distance : 0;
		this.angle = ( angle !== undefined ) ? angle : Math.PI / 3;
		this.penumbra = ( penumbra !== undefined ) ? penumbra : 0;
		this.decay = ( decay !== undefined ) ? decay : 1;	// for physically correct lights, should be 2.

		this.shadow = new SpotLightShadow();

	}

	SpotLight.prototype = Object.assign( Object.create( Light.prototype ), {

		constructor: SpotLight,

		isSpotLight: true,

		copy: function ( source ) {

			Light.prototype.copy.call( this, source );

			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;

		}

	} );

	function PointLightShadow() {

		LightShadow.call( this, new PerspectiveCamera( 90, 1, 0.5, 500 ) );

		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 )
		];

	}

	PointLightShadow.prototype = Object.assign( Object.create( LightShadow.prototype ), {

		constructor: PointLightShadow,

		isPointLightShadow: true,

		updateMatrices: function ( light, viewportIndex ) {

			if ( viewportIndex === undefined ) { viewportIndex = 0; }

			var camera = this.camera,
				shadowMatrix = this.matrix,
				lightPositionWorld = this._lightPositionWorld,
				lookTarget = this._lookTarget,
				projScreenMatrix = this._projScreenMatrix;

			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.multiplyMatrices( camera.projectionMatrix, camera.matrixWorldInverse );
			this._frustum.setFromProjectionMatrix( projScreenMatrix );

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */


	function PointLight( color, intensity, distance, decay ) {

		Light.call( this, color, intensity );

		this.type = 'PointLight';

		Object.defineProperty( this, 'power', {
			get: function () {

				// intensity = power per solid angle.
				// ref: equation (15) from https://seblagarde.files.wordpress.com/2015/07/course_notes_moving_frostbite_to_pbr_v32.pdf
				return this.intensity * 4 * Math.PI;

			},
			set: function ( power ) {

				// intensity = power per solid angle.
				// ref: equation (15) from https://seblagarde.files.wordpress.com/2015/07/course_notes_moving_frostbite_to_pbr_v32.pdf
				this.intensity = power / ( 4 * Math.PI );

			}
		} );

		this.distance = ( distance !== undefined ) ? distance : 0;
		this.decay = ( decay !== undefined ) ? decay : 1;	// for physically correct lights, should be 2.

		this.shadow = new PointLightShadow();

	}

	PointLight.prototype = Object.assign( Object.create( Light.prototype ), {

		constructor: PointLight,

		isPointLight: true,

		copy: function ( source ) {

			Light.prototype.copy.call( this, source );

			this.distance = source.distance;
			this.decay = source.decay;

			this.shadow = source.shadow.clone();

			return this;

		}

	} );

	/**
	 * @author alteredq / http://alteredqualia.com/
	 * @author arose / http://github.com/arose
	 */

	function OrthographicCamera( left, right, top, bottom, near, far ) {

		Camera.call( this );

		this.type = 'OrthographicCamera';

		this.zoom = 1;
		this.view = null;

		this.left = ( left !== undefined ) ? left : - 1;
		this.right = ( right !== undefined ) ? right : 1;
		this.top = ( top !== undefined ) ? top : 1;
		this.bottom = ( bottom !== undefined ) ? bottom : - 1;

		this.near = ( near !== undefined ) ? near : 0.1;
		this.far = ( far !== undefined ) ? far : 2000;

		this.updateProjectionMatrix();

	}

	OrthographicCamera.prototype = Object.assign( Object.create( Camera.prototype ), {

		constructor: OrthographicCamera,

		isOrthographicCamera: true,

		copy: function ( source, recursive ) {

			Camera.prototype.copy.call( this, 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: function ( 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: function () {

			if ( this.view !== null ) {

				this.view.enabled = false;

			}

			this.updateProjectionMatrix();

		},

		updateProjectionMatrix: function () {

			var dx = ( this.right - this.left ) / ( 2 * this.zoom );
			var dy = ( this.top - this.bottom ) / ( 2 * this.zoom );
			var cx = ( this.right + this.left ) / 2;
			var cy = ( this.top + this.bottom ) / 2;

			var left = cx - dx;
			var right = cx + dx;
			var top = cy + dy;
			var bottom = cy - dy;

			if ( this.view !== null && this.view.enabled ) {

				var scaleW = ( this.right - this.left ) / this.view.fullWidth / this.zoom;
				var 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.projectionMatrixInverse.getInverse( this.projectionMatrix );

		},

		toJSON: function ( meta ) {

			var data = Object3D.prototype.toJSON.call( this, 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;

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function DirectionalLightShadow() {

		LightShadow.call( this, new OrthographicCamera( - 5, 5, 5, - 5, 0.5, 500 ) );

	}

	DirectionalLightShadow.prototype = Object.assign( Object.create( LightShadow.prototype ), {

		constructor: DirectionalLightShadow,

		isDirectionalLightShadow: true,

		updateMatrices: function ( light ) {

			LightShadow.prototype.updateMatrices.call( this, light );

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author alteredq / http://alteredqualia.com/
	 */

	function DirectionalLight( color, intensity ) {

		Light.call( this, color, intensity );

		this.type = 'DirectionalLight';

		this.position.copy( Object3D.DefaultUp );
		this.updateMatrix();

		this.target = new Object3D();

		this.shadow = new DirectionalLightShadow();

	}

	DirectionalLight.prototype = Object.assign( Object.create( Light.prototype ), {

		constructor: DirectionalLight,

		isDirectionalLight: true,

		copy: function ( source ) {

			Light.prototype.copy.call( this, source );

			this.target = source.target.clone();

			this.shadow = source.shadow.clone();

			return this;

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function AmbientLight( color, intensity ) {

		Light.call( this, color, intensity );

		this.type = 'AmbientLight';

		this.castShadow = undefined;

	}

	AmbientLight.prototype = Object.assign( Object.create( Light.prototype ), {

		constructor: AmbientLight,

		isAmbientLight: true

	} );

	/**
	 * @author abelnation / http://github.com/abelnation
	 */

	function RectAreaLight( color, intensity, width, height ) {

		Light.call( this, color, intensity );

		this.type = 'RectAreaLight';

		this.width = ( width !== undefined ) ? width : 10;
		this.height = ( height !== undefined ) ? height : 10;

	}

	RectAreaLight.prototype = Object.assign( Object.create( Light.prototype ), {

		constructor: RectAreaLight,

		isRectAreaLight: true,

		copy: function ( source ) {

			Light.prototype.copy.call( this, source );

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

			return this;

		},

		toJSON: function ( meta ) {

			var data = Light.prototype.toJSON.call( this, meta );

			data.object.width = this.width;
			data.object.height = this.height;

			return data;

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function MaterialLoader( manager ) {

		Loader.call( this, manager );

		this.textures = {};

	}

	MaterialLoader.prototype = Object.assign( Object.create( Loader.prototype ), {

		constructor: MaterialLoader,

		load: function ( url, onLoad, onProgress, onError ) {

			var scope = this;

			var loader = new FileLoader( scope.manager );
			loader.setPath( scope.path );
			loader.load( url, function ( text ) {

				onLoad( scope.parse( JSON.parse( text ) ) );

			}, onProgress, onError );

		},

		parse: function ( json ) {

			var textures = this.textures;

			function getTexture( name ) {

				if ( textures[ name ] === undefined ) {

					console.warn( 'THREE.MaterialLoader: Undefined texture', name );

				}

				return textures[ name ];

			}

			var material = new Materials[ json.type ]();

			if ( json.uuid !== undefined ) { material.uuid = json.uuid; }
			if ( json.name !== undefined ) { material.name = json.name; }
			if ( json.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 = new Color().setHex( json.sheen ); }
			if ( json.emissive !== undefined ) { material.emissive.setHex( json.emissive ); }
			if ( json.specular !== undefined ) { material.specular.setHex( json.specular ); }
			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.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.opacity !== undefined ) { material.opacity = json.opacity; }
			if ( json.transparent !== undefined ) { material.transparent = json.transparent; }
			if ( json.alphaTest !== undefined ) { material.alphaTest = json.alphaTest; }
			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.stencilWrite !== undefined ) { material.stencilWrite = json.stencilWrite; }
			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.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 !== 1 ) { 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.skinning !== undefined ) { material.skinning = json.skinning; }
			if ( json.morphTargets !== undefined ) { material.morphTargets = json.morphTargets; }
			if ( json.morphNormals !== undefined ) { material.morphNormals = json.morphNormals; }
			if ( json.dithering !== undefined ) { material.dithering = json.dithering; }

			if ( json.vertexTangents !== undefined ) { material.vertexTangents = json.vertexTangents; }

			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 ( var name in json.uniforms ) {

					var 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 );

						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.extensions !== undefined ) {

				for ( var key in json.extensions ) {

					material.extensions[ key ] = json.extensions[ key ];

				}

			}

			// Deprecated

			if ( json.shading !== undefined ) { material.flatShading = json.shading === 1; } // THREE.FlatShading

			// 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 ) {

				var 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.envMap !== undefined ) { material.envMap = getTexture( json.envMap ); }
			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.clearcoatNormalMap !== undefined ) { material.clearcoatNormalMap = getTexture( json.clearcoatNormalMap ); }
			if ( json.clearcoatNormalScale !== undefined ) { material.clearcoatNormalScale = new Vector2().fromArray( json.clearcoatNormalScale ); }

			return material;

		},

		setTextures: function ( value ) {

			this.textures = value;
			return this;

		}

	} );

	/**
	 * @author Don McCurdy / https://www.donmccurdy.com
	 */

	var LoaderUtils = {

		decodeText: function ( array ) {

			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.

			var s = '';

			for ( var 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;

			}

		},

		extractUrlBase: function ( url ) {

			var index = url.lastIndexOf( '/' );

			if ( index === - 1 ) { return './'; }

			return url.substr( 0, index + 1 );

		}

	};

	/**
	 * @author benaadams / https://twitter.com/ben_a_adams
	 */

	function InstancedBufferGeometry() {

		BufferGeometry.call( this );

		this.type = 'InstancedBufferGeometry';
		this.maxInstancedCount = undefined;

	}

	InstancedBufferGeometry.prototype = Object.assign( Object.create( BufferGeometry.prototype ), {

		constructor: InstancedBufferGeometry,

		isInstancedBufferGeometry: true,

		copy: function ( source ) {

			BufferGeometry.prototype.copy.call( this, source );

			this.maxInstancedCount = source.maxInstancedCount;

			return this;

		},

		clone: function () {

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

		},

		toJSON: function () {

			var data = BufferGeometry.prototype.toJSON.call( this );

			data.maxInstancedCount = this.maxInstancedCount;

			data.isInstancedBufferGeometry = true;

			return data;

		}

	} );

	/**
	 * @author benaadams / https://twitter.com/ben_a_adams
	 */

	function InstancedBufferAttribute( array, itemSize, normalized, meshPerAttribute ) {

		if ( typeof ( normalized ) === 'number' ) {

			meshPerAttribute = normalized;

			normalized = false;

			console.error( 'THREE.InstancedBufferAttribute: The constructor now expects normalized as the third argument.' );

		}

		BufferAttribute.call( this, array, itemSize, normalized );

		this.meshPerAttribute = meshPerAttribute || 1;

	}

	InstancedBufferAttribute.prototype = Object.assign( Object.create( BufferAttribute.prototype ), {

		constructor: InstancedBufferAttribute,

		isInstancedBufferAttribute: true,

		copy: function ( source ) {

			BufferAttribute.prototype.copy.call( this, source );

			this.meshPerAttribute = source.meshPerAttribute;

			return this;

		},

		toJSON: function ()	{

			var data = BufferAttribute.prototype.toJSON.call( this );

			data.meshPerAttribute = this.meshPerAttribute;

			data.isInstancedBufferAttribute = true;

			return data;

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function BufferGeometryLoader( manager ) {

		Loader.call( this, manager );

	}

	BufferGeometryLoader.prototype = Object.assign( Object.create( Loader.prototype ), {

		constructor: BufferGeometryLoader,

		load: function ( url, onLoad, onProgress, onError ) {

			var scope = this;

			var loader = new FileLoader( scope.manager );
			loader.setPath( scope.path );
			loader.load( url, function ( text ) {

				onLoad( scope.parse( JSON.parse( text ) ) );

			}, onProgress, onError );

		},

		parse: function ( json ) {

			var geometry = json.isInstancedBufferGeometry ? new InstancedBufferGeometry() : new BufferGeometry();

			var index = json.data.index;

			if ( index !== undefined ) {

				var typedArray = new TYPED_ARRAYS[ index.type ]( index.array );
				geometry.setIndex( new BufferAttribute( typedArray, 1 ) );

			}

			var attributes = json.data.attributes;

			for ( var key in attributes ) {

				var attribute = attributes[ key ];
				var typedArray = new TYPED_ARRAYS[ attribute.type ]( attribute.array );
				var bufferAttributeConstr = attribute.isInstancedBufferAttribute ? InstancedBufferAttribute : BufferAttribute;
				var bufferAttribute = new bufferAttributeConstr( typedArray, attribute.itemSize, attribute.normalized );
				if ( attribute.name !== undefined ) { bufferAttribute.name = attribute.name; }
				geometry.setAttribute( key, bufferAttribute );

			}

			var morphAttributes = json.data.morphAttributes;

			if ( morphAttributes ) {

				for ( var key in morphAttributes ) {

					var attributeArray = morphAttributes[ key ];

					var array = [];

					for ( var i = 0, il = attributeArray.length; i < il; i ++ ) {

						var attribute = attributeArray[ i ];
						var typedArray = new TYPED_ARRAYS[ attribute.type ]( attribute.array );

						var bufferAttribute = new BufferAttribute( typedArray, attribute.itemSize, attribute.normalized );
						if ( attribute.name !== undefined ) { bufferAttribute.name = attribute.name; }
						array.push( bufferAttribute );

					}

					geometry.morphAttributes[ key ] = array;

				}

			}

			var morphTargetsRelative = json.data.morphTargetsRelative;

			if ( morphTargetsRelative ) {

				geometry.morphTargetsRelative = true;

			}

			var groups = json.data.groups || json.data.drawcalls || json.data.offsets;

			if ( groups !== undefined ) {

				for ( var i = 0, n = groups.length; i !== n; ++ i ) {

					var group = groups[ i ];

					geometry.addGroup( group.start, group.count, group.materialIndex );

				}

			}

			var boundingSphere = json.data.boundingSphere;

			if ( boundingSphere !== undefined ) {

				var 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;

		}

	} );

	var TYPED_ARRAYS = {
		Int8Array: Int8Array,
		Uint8Array: Uint8Array,
		// Workaround for IE11 pre KB2929437. See #11440
		Uint8ClampedArray: typeof Uint8ClampedArray !== 'undefined' ? Uint8ClampedArray : Uint8Array,
		Int16Array: Int16Array,
		Uint16Array: Uint16Array,
		Int32Array: Int32Array,
		Uint32Array: Uint32Array,
		Float32Array: Float32Array,
		Float64Array: Float64Array
	};

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function ObjectLoader( manager ) {

		Loader.call( this, manager );

	}

	ObjectLoader.prototype = Object.assign( Object.create( Loader.prototype ), {

		constructor: ObjectLoader,

		load: function ( url, onLoad, onProgress, onError ) {

			var scope = this;

			var path = ( this.path === '' ) ? LoaderUtils.extractUrlBase( url ) : this.path;
			this.resourcePath = this.resourcePath || path;

			var loader = new FileLoader( scope.manager );
			loader.setPath( this.path );
			loader.load( url, function ( text ) {

				var 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;

				}

				var metadata = json.metadata;

				if ( metadata === undefined || metadata.type === undefined || metadata.type.toLowerCase() === 'geometry' ) {

					console.error( 'THREE.ObjectLoader: Can\'t load ' + url );
					return;

				}

				scope.parse( json, onLoad );

			}, onProgress, onError );

		},

		parse: function ( json, onLoad ) {

			var shapes = this.parseShape( json.shapes );
			var geometries = this.parseGeometries( json.geometries, shapes );

			var images = this.parseImages( json.images, function () {

				if ( onLoad !== undefined ) { onLoad( object ); }

			} );

			var textures = this.parseTextures( json.textures, images );
			var materials = this.parseMaterials( json.materials, textures );

			var object = this.parseObject( json.object, geometries, materials );

			if ( json.animations ) {

				object.animations = this.parseAnimations( json.animations );

			}

			if ( json.images === undefined || json.images.length === 0 ) {

				if ( onLoad !== undefined ) { onLoad( object ); }

			}

			return object;

		},

		parseShape: function ( json ) {

			var shapes = {};

			if ( json !== undefined ) {

				for ( var i = 0, l = json.length; i < l; i ++ ) {

					var shape = new Shape().fromJSON( json[ i ] );

					shapes[ shape.uuid ] = shape;

				}

			}

			return shapes;

		},

		parseGeometries: function ( json, shapes ) {

			var geometries = {};

			if ( json !== undefined ) {

				var bufferGeometryLoader = new BufferGeometryLoader();

				for ( var i = 0, l = json.length; i < l; i ++ ) {

					var geometry;
					var data = json[ i ];

					switch ( data.type ) {

						case 'PlaneGeometry':
						case 'PlaneBufferGeometry':

							geometry = new Geometries[ data.type ](
								data.width,
								data.height,
								data.widthSegments,
								data.heightSegments
							);

							break;

						case 'BoxGeometry':
						case 'BoxBufferGeometry':
						case 'CubeGeometry': // backwards compatible

							geometry = new Geometries[ data.type ](
								data.width,
								data.height,
								data.depth,
								data.widthSegments,
								data.heightSegments,
								data.depthSegments
							);

							break;

						case 'CircleGeometry':
						case 'CircleBufferGeometry':

							geometry = new Geometries[ data.type ](
								data.radius,
								data.segments,
								data.thetaStart,
								data.thetaLength
							);

							break;

						case 'CylinderGeometry':
						case 'CylinderBufferGeometry':

							geometry = new Geometries[ data.type ](
								data.radiusTop,
								data.radiusBottom,
								data.height,
								data.radialSegments,
								data.heightSegments,
								data.openEnded,
								data.thetaStart,
								data.thetaLength
							);

							break;

						case 'ConeGeometry':
						case 'ConeBufferGeometry':

							geometry = new Geometries[ data.type ](
								data.radius,
								data.height,
								data.radialSegments,
								data.heightSegments,
								data.openEnded,
								data.thetaStart,
								data.thetaLength
							);

							break;

						case 'SphereGeometry':
						case 'SphereBufferGeometry':

							geometry = new Geometries[ data.type ](
								data.radius,
								data.widthSegments,
								data.heightSegments,
								data.phiStart,
								data.phiLength,
								data.thetaStart,
								data.thetaLength
							);

							break;

						case 'DodecahedronGeometry':
						case 'DodecahedronBufferGeometry':
						case 'IcosahedronGeometry':
						case 'IcosahedronBufferGeometry':
						case 'OctahedronGeometry':
						case 'OctahedronBufferGeometry':
						case 'TetrahedronGeometry':
						case 'TetrahedronBufferGeometry':

							geometry = new Geometries[ data.type ](
								data.radius,
								data.detail
							);

							break;

						case 'RingGeometry':
						case 'RingBufferGeometry':

							geometry = new Geometries[ data.type ](
								data.innerRadius,
								data.outerRadius,
								data.thetaSegments,
								data.phiSegments,
								data.thetaStart,
								data.thetaLength
							);

							break;

						case 'TorusGeometry':
						case 'TorusBufferGeometry':

							geometry = new Geometries[ data.type ](
								data.radius,
								data.tube,
								data.radialSegments,
								data.tubularSegments,
								data.arc
							);

							break;

						case 'TorusKnotGeometry':
						case 'TorusKnotBufferGeometry':

							geometry = new Geometries[ data.type ](
								data.radius,
								data.tube,
								data.tubularSegments,
								data.radialSegments,
								data.p,
								data.q
							);

							break;

						case 'TubeGeometry':
						case 'TubeBufferGeometry':

							// This only works for built-in curves (e.g. CatmullRomCurve3).
							// User defined curves or instances of CurvePath will not be deserialized.
							geometry = new Geometries[ data.type ](
								new Curves[ data.path.type ]().fromJSON( data.path ),
								data.tubularSegments,
								data.radius,
								data.radialSegments,
								data.closed
							);

							break;

						case 'LatheGeometry':
						case 'LatheBufferGeometry':

							geometry = new Geometries[ data.type ](
								data.points,
								data.segments,
								data.phiStart,
								data.phiLength
							);

							break;

						case 'PolyhedronGeometry':
						case 'PolyhedronBufferGeometry':

							geometry = new Geometries[ data.type ](
								data.vertices,
								data.indices,
								data.radius,
								data.details
							);

							break;

						case 'ShapeGeometry':
						case 'ShapeBufferGeometry':

							var geometryShapes = [];

							for ( var j = 0, jl = data.shapes.length; j < jl; j ++ ) {

								var shape = shapes[ data.shapes[ j ] ];

								geometryShapes.push( shape );

							}

							geometry = new Geometries[ data.type ](
								geometryShapes,
								data.curveSegments
							);

							break;


						case 'ExtrudeGeometry':
						case 'ExtrudeBufferGeometry':

							var geometryShapes = [];

							for ( var j = 0, jl = data.shapes.length; j < jl; j ++ ) {

								var shape = shapes[ data.shapes[ j ] ];

								geometryShapes.push( shape );

							}

							var extrudePath = data.options.extrudePath;

							if ( extrudePath !== undefined ) {

								data.options.extrudePath = new Curves[ extrudePath.type ]().fromJSON( extrudePath );

							}

							geometry = new Geometries[ data.type ](
								geometryShapes,
								data.options
							);

							break;

						case 'BufferGeometry':
						case 'InstancedBufferGeometry':

							geometry = bufferGeometryLoader.parse( data );

							break;

						case 'Geometry':

							console.error( 'THREE.ObjectLoader: Loading "Geometry" is not supported anymore.' );

							break;

						default:

							console.warn( 'THREE.ObjectLoader: Unsupported geometry type "' + data.type + '"' );

							continue;

					}

					geometry.uuid = data.uuid;

					if ( data.name !== undefined ) { geometry.name = data.name; }
					if ( geometry.isBufferGeometry === true && data.userData !== undefined ) { geometry.userData = data.userData; }

					geometries[ data.uuid ] = geometry;

				}

			}

			return geometries;

		},

		parseMaterials: function ( json, textures ) {

			var cache = {}; // MultiMaterial
			var materials = {};

			if ( json !== undefined ) {

				var loader = new MaterialLoader();
				loader.setTextures( textures );

				for ( var i = 0, l = json.length; i < l; i ++ ) {

					var data = json[ i ];

					if ( data.type === 'MultiMaterial' ) {

						// Deprecated

						var array = [];

						for ( var j = 0; j < data.materials.length; j ++ ) {

							var material = data.materials[ j ];

							if ( cache[ material.uuid ] === undefined ) {

								cache[ material.uuid ] = loader.parse( material );

							}

							array.push( cache[ material.uuid ] );

						}

						materials[ data.uuid ] = array;

					} else {

						if ( cache[ data.uuid ] === undefined ) {

							cache[ data.uuid ] = loader.parse( data );

						}

						materials[ data.uuid ] = cache[ data.uuid ];

					}

				}

			}

			return materials;

		},

		parseAnimations: function ( json ) {

			var animations = [];

			for ( var i = 0; i < json.length; i ++ ) {

				var data = json[ i ];

				var clip = AnimationClip.parse( data );

				if ( data.uuid !== undefined ) { clip.uuid = data.uuid; }

				animations.push( clip );

			}

			return animations;

		},

		parseImages: function ( json, onLoad ) {

			var scope = this;
			var images = {};

			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 );

				} );

			}

			if ( json !== undefined && json.length > 0 ) {

				var manager = new LoadingManager( onLoad );

				var loader = new ImageLoader( manager );
				loader.setCrossOrigin( this.crossOrigin );

				for ( var i = 0, il = json.length; i < il; i ++ ) {

					var image = json[ i ];
					var url = image.url;

					if ( Array.isArray( url ) ) {

						// load array of images e.g CubeTexture

						images[ image.uuid ] = [];

						for ( var j = 0, jl = url.length; j < jl; j ++ ) {

							var currentUrl = url[ j ];

							var path = /^(\/\/)|([a-z]+:(\/\/)?)/i.test( currentUrl ) ? currentUrl : scope.resourcePath + currentUrl;

							images[ image.uuid ].push( loadImage( path ) );

						}

					} else {

						// load single image

						var path = /^(\/\/)|([a-z]+:(\/\/)?)/i.test( image.url ) ? image.url : scope.resourcePath + image.url;

						images[ image.uuid ] = loadImage( path );

					}

				}

			}

			return images;

		},

		parseTextures: function ( 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 ];

			}

			var textures = {};

			if ( json !== undefined ) {

				for ( var i = 0, l = json.length; i < l; i ++ ) {

					var 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 );

					}

					var texture;

					if ( Array.isArray( images[ data.image ] ) ) {

						texture = new CubeTexture( images[ data.image ] );

					} else {

						texture = new Texture( images[ data.image ] );

					}

					texture.needsUpdate = true;

					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.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.type !== undefined ) { texture.type = data.type; }
					if ( data.encoding !== undefined ) { texture.encoding = data.encoding; }

					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.premultiplyAlpha !== undefined ) { texture.premultiplyAlpha = data.premultiplyAlpha; }
					if ( data.unpackAlignment !== undefined ) { texture.unpackAlignment = data.unpackAlignment; }

					textures[ data.uuid ] = texture;

				}

			}

			return textures;

		},

		parseObject: function ( data, geometries, materials ) {

			var 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 ) ) {

					var array = [];

					for ( var i = 0, l = name.length; i < l; i ++ ) {

						var 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 ];

			}

			switch ( data.type ) {

				case 'Scene':

					object = new Scene();

					if ( data.background !== undefined ) {

						if ( Number.isInteger( data.background ) ) {

							object.background = new Color( data.background );

						}

					}

					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 );

						}

					}

					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 );

					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 );

					break;

				case 'HemisphereLight':

					object = new HemisphereLight( data.color, data.groundColor, data.intensity );

					break;

				case 'SkinnedMesh':

					console.warn( 'THREE.ObjectLoader.parseObject() does not support SkinnedMesh yet.' );

				case 'Mesh':

					var geometry = getGeometry( data.geometry );
					var material = getMaterial( data.material );

					if ( geometry.bones && geometry.bones.length > 0 ) {

						object = new SkinnedMesh( geometry, material );

					} else {

						object = new Mesh( geometry, material );

					}

					break;

				case 'InstancedMesh':

					var geometry = getGeometry( data.geometry );
					var material = getMaterial( data.material );
					var count = data.count;
					var instanceMatrix = data.instanceMatrix;

					object = new InstancedMesh( geometry, material, count );
					object.instanceMatrix = new BufferAttribute( new Float32Array( instanceMatrix.array ), 16 );

					break;

				case 'LOD':

					object = new LOD();

					break;

				case 'Line':

					object = new Line( getGeometry( data.geometry ), getMaterial( data.material ), data.mode );

					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;

				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.castShadow !== undefined ) { object.castShadow = data.castShadow; }
			if ( data.receiveShadow !== undefined ) { object.receiveShadow = data.receiveShadow; }

			if ( data.shadow ) {

				if ( data.shadow.bias !== undefined ) { object.shadow.bias = data.shadow.bias; }
				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 ) {

				var children = data.children;

				for ( var i = 0; i < children.length; i ++ ) {

					object.add( this.parseObject( children[ i ], geometries, materials ) );

				}

			}

			if ( data.type === 'LOD' ) {

				if ( data.autoUpdate !== undefined ) { object.autoUpdate = data.autoUpdate; }

				var levels = data.levels;

				for ( var l = 0; l < levels.length; l ++ ) {

					var level = levels[ l ];
					var child = object.getObjectByProperty( 'uuid', level.object );

					if ( child !== undefined ) {

						object.addLevel( child, level.distance );

					}

				}

			}

			return object;

		}

	} );

	var TEXTURE_MAPPING = {
		UVMapping: UVMapping,
		CubeReflectionMapping: CubeReflectionMapping,
		CubeRefractionMapping: CubeRefractionMapping,
		EquirectangularReflectionMapping: EquirectangularReflectionMapping,
		EquirectangularRefractionMapping: EquirectangularRefractionMapping,
		SphericalReflectionMapping: SphericalReflectionMapping,
		CubeUVReflectionMapping: CubeUVReflectionMapping,
		CubeUVRefractionMapping: CubeUVRefractionMapping
	};

	var TEXTURE_WRAPPING = {
		RepeatWrapping: RepeatWrapping,
		ClampToEdgeWrapping: ClampToEdgeWrapping,
		MirroredRepeatWrapping: MirroredRepeatWrapping
	};

	var TEXTURE_FILTER = {
		NearestFilter: NearestFilter,
		NearestMipmapNearestFilter: NearestMipmapNearestFilter,
		NearestMipmapLinearFilter: NearestMipmapLinearFilter,
		LinearFilter: LinearFilter,
		LinearMipmapNearestFilter: LinearMipmapNearestFilter,
		LinearMipmapLinearFilter: LinearMipmapLinearFilter
	};

	/**
	 * @author thespite / http://clicktorelease.com/
	 */


	function ImageBitmapLoader( manager ) {

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

			console.warn( 'THREE.ImageBitmapLoader: createImageBitmap() not supported.' );

		}

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

			console.warn( 'THREE.ImageBitmapLoader: fetch() not supported.' );

		}

		Loader.call( this, manager );

		this.options = undefined;

	}

	ImageBitmapLoader.prototype = Object.assign( Object.create( Loader.prototype ), {

		constructor: ImageBitmapLoader,

		setOptions: function setOptions( options ) {

			this.options = options;

			return this;

		},

		load: function ( url, onLoad, onProgress, onError ) {

			if ( url === undefined ) { url = ''; }

			if ( this.path !== undefined ) { url = this.path + url; }

			url = this.manager.resolveURL( url );

			var scope = this;

			var cached = Cache.get( url );

			if ( cached !== undefined ) {

				scope.manager.itemStart( url );

				setTimeout( function () {

					if ( onLoad ) { onLoad( cached ); }

					scope.manager.itemEnd( url );

				}, 0 );

				return cached;

			}

			fetch( url ).then( function ( res ) {

				return res.blob();

			} ).then( function ( blob ) {

				if ( scope.options === undefined ) {

					// Workaround for FireFox. It causes an error if you pass options.
					return createImageBitmap( blob );

				} else {

					return createImageBitmap( blob, scope.options );

				}

			} ).then( function ( imageBitmap ) {

				Cache.add( url, imageBitmap );

				if ( onLoad ) { onLoad( imageBitmap ); }

				scope.manager.itemEnd( url );

			} ).catch( function ( e ) {

				if ( onError ) { onError( e ); }

				scope.manager.itemError( url );
				scope.manager.itemEnd( url );

			} );

			scope.manager.itemStart( url );

		}

	} );

	/**
	 * @author zz85 / http://www.lab4games.net/zz85/blog
	 * minimal class for proxing functions to Path. Replaces old "extractSubpaths()"
	 **/

	function ShapePath() {

		this.type = 'ShapePath';

		this.color = new Color();

		this.subPaths = [];
		this.currentPath = null;

	}

	Object.assign( ShapePath.prototype, {

		moveTo: function ( x, y ) {

			this.currentPath = new Path();
			this.subPaths.push( this.currentPath );
			this.currentPath.moveTo( x, y );

			return this;

		},

		lineTo: function ( x, y ) {

			this.currentPath.lineTo( x, y );

			return this;

		},

		quadraticCurveTo: function ( aCPx, aCPy, aX, aY ) {

			this.currentPath.quadraticCurveTo( aCPx, aCPy, aX, aY );

			return this;

		},

		bezierCurveTo: function ( aCP1x, aCP1y, aCP2x, aCP2y, aX, aY ) {

			this.currentPath.bezierCurveTo( aCP1x, aCP1y, aCP2x, aCP2y, aX, aY );

			return this;

		},

		splineThru: function ( pts ) {

			this.currentPath.splineThru( pts );

			return this;

		},

		toShapes: function ( isCCW, noHoles ) {

			function toShapesNoHoles( inSubpaths ) {

				var shapes = [];

				for ( var i = 0, l = inSubpaths.length; i < l; i ++ ) {

					var tmpPath = inSubpaths[ i ];

					var tmpShape = new Shape();
					tmpShape.curves = tmpPath.curves;

					shapes.push( tmpShape );

				}

				return shapes;

			}

			function isPointInsidePolygon( inPt, inPolygon ) {

				var 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
				var inside = false;
				for ( var p = polyLen - 1, q = 0; q < polyLen; p = q ++ ) {

					var edgeLowPt = inPolygon[ p ];
					var edgeHighPt = inPolygon[ q ];

					var edgeDx = edgeHighPt.x - edgeLowPt.x;
					var 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 {

							var 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;

			}

			var isClockWise = ShapeUtils.isClockWise;

			var subPaths = this.subPaths;
			if ( subPaths.length === 0 ) { return []; }

			if ( noHoles === true )	{ return	toShapesNoHoles( subPaths ); }


			var solid, tmpPath, tmpShape, shapes = [];

			if ( subPaths.length === 1 ) {

				tmpPath = subPaths[ 0 ];
				tmpShape = new Shape();
				tmpShape.curves = tmpPath.curves;
				shapes.push( tmpShape );
				return shapes;

			}

			var holesFirst = ! isClockWise( subPaths[ 0 ].getPoints() );
			holesFirst = isCCW ? ! holesFirst : holesFirst;

			// console.log("Holes first", holesFirst);

			var betterShapeHoles = [];
			var newShapes = [];
			var newShapeHoles = [];
			var mainIdx = 0;
			var tmpPoints;

			newShapes[ mainIdx ] = undefined;
			newShapeHoles[ mainIdx ] = [];

			for ( var 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 ) {

				var ambiguous = false;
				var toChange = [];

				for ( var sIdx = 0, sLen = newShapes.length; sIdx < sLen; sIdx ++ ) {

					betterShapeHoles[ sIdx ] = [];

				}

				for ( var sIdx = 0, sLen = newShapes.length; sIdx < sLen; sIdx ++ ) {

					var sho = newShapeHoles[ sIdx ];

					for ( var hIdx = 0; hIdx < sho.length; hIdx ++ ) {

						var ho = sho[ hIdx ];
						var hole_unassigned = true;

						for ( var s2Idx = 0; s2Idx < newShapes.length; s2Idx ++ ) {

							if ( isPointInsidePolygon( ho.p, newShapes[ s2Idx ].p ) ) {

								if ( sIdx !== s2Idx )	{ toChange.push( { froms: sIdx, tos: s2Idx, hole: hIdx } ); }
								if ( hole_unassigned ) {

									hole_unassigned = false;
									betterShapeHoles[ s2Idx ].push( ho );

								} else {

									ambiguous = true;

								}

							}

						}
						if ( hole_unassigned ) {

							betterShapeHoles[ sIdx ].push( ho );

						}

					}

				}
				// console.log("ambiguous: ", ambiguous);
				if ( toChange.length > 0 ) {

					// console.log("to change: ", toChange);
					if ( ! ambiguous )	{ newShapeHoles = betterShapeHoles; }

				}

			}

			var tmpHoles;

			for ( var i = 0, il = newShapes.length; i < il; i ++ ) {

				tmpShape = newShapes[ i ].s;
				shapes.push( tmpShape );
				tmpHoles = newShapeHoles[ i ];

				for ( var j = 0, jl = tmpHoles.length; j < jl; j ++ ) {

					tmpShape.holes.push( tmpHoles[ j ].h );

				}

			}

			//console.log("shape", shapes);

			return shapes;

		}

	} );

	/**
	 * @author zz85 / http://www.lab4games.net/zz85/blog
	 * @author mrdoob / http://mrdoob.com/
	 */


	function Font( data ) {

		this.type = 'Font';

		this.data = data;

	}

	Object.assign( Font.prototype, {

		isFont: true,

		generateShapes: function ( text, size ) {

			if ( size === undefined ) { size = 100; }

			var shapes = [];
			var paths = createPaths( text, size, this.data );

			for ( var p = 0, pl = paths.length; p < pl; p ++ ) {

				Array.prototype.push.apply( shapes, paths[ p ].toShapes() );

			}

			return shapes;

		}

	} );

	function createPaths( text, size, data ) {

		var chars = Array.from ? Array.from( text ) : String( text ).split( '' ); // workaround for IE11, see #13988
		var scale = size / data.resolution;
		var line_height = ( data.boundingBox.yMax - data.boundingBox.yMin + data.underlineThickness ) * scale;

		var paths = [];

		var offsetX = 0, offsetY = 0;

		for ( var i = 0; i < chars.length; i ++ ) {

			var char = chars[ i ];

			if ( char === '\n' ) {

				offsetX = 0;
				offsetY -= line_height;

			} else {

				var ret = createPath( char, scale, offsetX, offsetY, data );
				offsetX += ret.offsetX;
				paths.push( ret.path );

			}

		}

		return paths;

	}

	function createPath( char, scale, offsetX, offsetY, data ) {

		var glyph = data.glyphs[ char ] || data.glyphs[ '?' ];

		if ( ! glyph ) {

			console.error( 'THREE.Font: character "' + char + '" does not exists in font family ' + data.familyName + '.' );

			return;

		}

		var path = new ShapePath();

		var x, y, cpx, cpy, cpx1, cpy1, cpx2, cpy2;

		if ( glyph.o ) {

			var outline = glyph._cachedOutline || ( glyph._cachedOutline = glyph.o.split( ' ' ) );

			for ( var i = 0, l = outline.length; i < l; ) {

				var action = outline[ i ++ ];

				switch ( action ) {

					case 'm': // moveTo

						x = outline[ i ++ ] * scale + offsetX;
						y = outline[ i ++ ] * scale + offsetY;

						path.moveTo( x, y );

						break;

					case 'l': // lineTo

						x = outline[ i ++ ] * scale + offsetX;
						y = outline[ i ++ ] * scale + offsetY;

						path.lineTo( x, y );

						break;

					case 'q': // quadraticCurveTo

						cpx = outline[ i ++ ] * scale + offsetX;
						cpy = outline[ i ++ ] * scale + offsetY;
						cpx1 = outline[ i ++ ] * scale + offsetX;
						cpy1 = outline[ i ++ ] * scale + offsetY;

						path.quadraticCurveTo( cpx1, cpy1, cpx, cpy );

						break;

					case 'b': // bezierCurveTo

						cpx = outline[ i ++ ] * scale + offsetX;
						cpy = outline[ i ++ ] * scale + offsetY;
						cpx1 = outline[ i ++ ] * scale + offsetX;
						cpy1 = outline[ i ++ ] * scale + offsetY;
						cpx2 = outline[ i ++ ] * scale + offsetX;
						cpy2 = outline[ i ++ ] * scale + offsetY;

						path.bezierCurveTo( cpx1, cpy1, cpx2, cpy2, cpx, cpy );

						break;

				}

			}

		}

		return { offsetX: glyph.ha * scale, path: path };

	}

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function FontLoader( manager ) {

		Loader.call( this, manager );

	}

	FontLoader.prototype = Object.assign( Object.create( Loader.prototype ), {

		constructor: FontLoader,

		load: function ( url, onLoad, onProgress, onError ) {

			var scope = this;

			var loader = new FileLoader( this.manager );
			loader.setPath( this.path );
			loader.load( url, function ( text ) {

				var json;

				try {

					json = JSON.parse( text );

				} catch ( e ) {

					console.warn( 'THREE.FontLoader: typeface.js support is being deprecated. Use typeface.json instead.' );
					json = JSON.parse( text.substring( 65, text.length - 2 ) );

				}

				var font = scope.parse( json );

				if ( onLoad ) { onLoad( font ); }

			}, onProgress, onError );

		},

		parse: function ( json ) {

			return new Font( json );

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	var _context;

	var AudioContext = {

		getContext: function () {

			if ( _context === undefined ) {

				_context = new ( window.AudioContext || window.webkitAudioContext )();

			}

			return _context;

		},

		setContext: function ( value ) {

			_context = value;

		}

	};

	/**
	 * @author Reece Aaron Lecrivain / http://reecenotes.com/
	 */

	function AudioLoader( manager ) {

		Loader.call( this, manager );

	}

	AudioLoader.prototype = Object.assign( Object.create( Loader.prototype ), {

		constructor: AudioLoader,

		load: function ( url, onLoad, onProgress, onError ) {

			var loader = new FileLoader( this.manager );
			loader.setResponseType( 'arraybuffer' );
			loader.setPath( this.path );
			loader.load( url, function ( buffer ) {

				// Create a copy of the buffer. The `decodeAudioData` method
				// detaches the buffer when complete, preventing reuse.
				var bufferCopy = buffer.slice( 0 );

				var context = AudioContext.getContext();
				context.decodeAudioData( bufferCopy, function ( audioBuffer ) {

					onLoad( audioBuffer );

				} );

			}, onProgress, onError );

		}

	} );

	/**
	 * @author bhouston / http://clara.io
	 * @author WestLangley / http://github.com/WestLangley
	 *
	 * 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

	function SphericalHarmonics3() {

		this.coefficients = [];

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

			this.coefficients.push( new Vector3() );

		}

	}

	Object.assign( SphericalHarmonics3.prototype, {

		isSphericalHarmonics3: true,

		set: function ( coefficients ) {

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

				this.coefficients[ i ].copy( coefficients[ i ] );

			}

			return this;

		},

		zero: function () {

			for ( var 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: function ( normal, target ) {

			// normal is assumed to be unit length

			var x = normal.x, y = normal.y, z = normal.z;

			var coeff = this.coefficients;

			// band 0
			target.copy( coeff[ 0 ] ).multiplyScalar( 0.282095 );

			// band 1
			target.addScale( coeff[ 1 ], 0.488603 * y );
			target.addScale( coeff[ 2 ], 0.488603 * z );
			target.addScale( coeff[ 3 ], 0.488603 * x );

			// band 2
			target.addScale( coeff[ 4 ], 1.092548 * ( x * y ) );
			target.addScale( coeff[ 5 ], 1.092548 * ( y * z ) );
			target.addScale( coeff[ 6 ], 0.315392 * ( 3.0 * z * z - 1.0 ) );
			target.addScale( coeff[ 7 ], 1.092548 * ( x * z ) );
			target.addScale( 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: function ( normal, target ) {

			// normal is assumed to be unit length

			var x = normal.x, y = normal.y, z = normal.z;

			var coeff = this.coefficients;

			// band 0
			target.copy( coeff[ 0 ] ).multiplyScalar( 0.886227 ); // π * 0.282095

			// band 1
			target.addScale( coeff[ 1 ], 2.0 * 0.511664 * y ); // ( 2 * π / 3 ) * 0.488603
			target.addScale( coeff[ 2 ], 2.0 * 0.511664 * z );
			target.addScale( coeff[ 3 ], 2.0 * 0.511664 * x );

			// band 2
			target.addScale( coeff[ 4 ], 2.0 * 0.429043 * x * y ); // ( π / 4 ) * 1.092548
			target.addScale( coeff[ 5 ], 2.0 * 0.429043 * y * z );
			target.addScale( coeff[ 6 ], 0.743125 * z * z - 0.247708 ); // ( π / 4 ) * 0.315392 * 3
			target.addScale( coeff[ 7 ], 2.0 * 0.429043 * x * z );
			target.addScale( coeff[ 8 ], 0.429043 * ( x * x - y * y ) ); // ( π / 4 ) * 0.546274

			return target;

		},

		add: function ( sh ) {

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

				this.coefficients[ i ].add( sh.coefficients[ i ] );

			}

			return this;

		},


		scale: function ( s ) {

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

				this.coefficients[ i ].multiplyScalar( s );

			}

			return this;

		},

		lerp: function ( sh, alpha ) {

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

				this.coefficients[ i ].lerp( sh.coefficients[ i ], alpha );

			}

			return this;

		},

		equals: function ( sh ) {

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

				if ( ! this.coefficients[ i ].equals( sh.coefficients[ i ] ) ) {

					return false;

				}

			}

			return true;

		},

		copy: function ( sh ) {

			return this.set( sh.coefficients );

		},

		clone: function () {

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

		},

		fromArray: function ( array, offset ) {

			if ( offset === undefined ) { offset = 0; }

			var coefficients = this.coefficients;

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

				coefficients[ i ].fromArray( array, offset + ( i * 3 ) );

			}

			return this;

		},

		toArray: function ( array, offset ) {

			if ( array === undefined ) { array = []; }
			if ( offset === undefined ) { offset = 0; }

			var coefficients = this.coefficients;

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

				coefficients[ i ].toArray( array, offset + ( i * 3 ) );

			}

			return array;

		}

	} );

	Object.assign( SphericalHarmonics3, {

		// evaluate the basis functions
		// shBasis is an Array[ 9 ]
		getBasisAt: function ( normal, shBasis ) {

			// normal is assumed to be unit length

			var 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 );

		}

	} );

	/**
	 * @author WestLangley / http://github.com/WestLangley
	 *
	 * A LightProbe is a source of indirect-diffuse light
	 */

	function LightProbe( sh, intensity ) {

		Light.call( this, undefined, intensity );

		this.sh = ( sh !== undefined ) ? sh : new SphericalHarmonics3();

	}

	LightProbe.prototype = Object.assign( Object.create( Light.prototype ), {

		constructor: LightProbe,

		isLightProbe: true,

		copy: function ( source ) {

			Light.prototype.copy.call( this, source );

			this.sh.copy( source.sh );
			this.intensity = source.intensity;

			return this;

		},

		toJSON: function ( meta ) {

			var data = Light.prototype.toJSON.call( this, meta );

			// data.sh = this.sh.toArray(); // todo

			return data;

		}

	} );

	/**
	 * @author WestLangley / http://github.com/WestLangley
	 */

	function HemisphereLightProbe( skyColor, groundColor, intensity ) {

		LightProbe.call( this, undefined, intensity );

		var color1 = new Color().set( skyColor );
		var color2 = new Color().set( groundColor );

		var sky = new Vector3( color1.r, color1.g, color1.b );
		var ground = new Vector3( color2.r, color2.g, color2.b );

		// without extra factor of PI in the shader, should = 1 / Math.sqrt( Math.PI );
		var c0 = Math.sqrt( Math.PI );
		var c1 = c0 * Math.sqrt( 0.75 );

		this.sh.coefficients[ 0 ].copy( sky ).add( ground ).multiplyScalar( c0 );
		this.sh.coefficients[ 1 ].copy( sky ).sub( ground ).multiplyScalar( c1 );

	}

	HemisphereLightProbe.prototype = Object.assign( Object.create( LightProbe.prototype ), {

		constructor: HemisphereLightProbe,

		isHemisphereLightProbe: true,

		copy: function ( source ) { // modifying colors not currently supported

			LightProbe.prototype.copy.call( this, source );

			return this;

		},

		toJSON: function ( meta ) {

			var data = LightProbe.prototype.toJSON.call( this, meta );

			// data.sh = this.sh.toArray(); // todo

			return data;

		}

	} );

	/**
	 * @author WestLangley / http://github.com/WestLangley
	 */

	function AmbientLightProbe( color, intensity ) {

		LightProbe.call( this, undefined, intensity );

		var color1 = new Color().set( color );

		// without extra factor of PI in the shader, would be 2 / Math.sqrt( Math.PI );
		this.sh.coefficients[ 0 ].set( color1.r, color1.g, color1.b ).multiplyScalar( 2 * Math.sqrt( Math.PI ) );

	}

	AmbientLightProbe.prototype = Object.assign( Object.create( LightProbe.prototype ), {

		constructor: AmbientLightProbe,

		isAmbientLightProbe: true,

		copy: function ( source ) { // modifying color not currently supported

			LightProbe.prototype.copy.call( this, source );

			return this;

		},

		toJSON: function ( meta ) {

			var data = LightProbe.prototype.toJSON.call( this, meta );

			// data.sh = this.sh.toArray(); // todo

			return data;

		}

	} );

	var _eyeRight = new Matrix4();
	var _eyeLeft = new Matrix4();

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function StereoCamera() {

		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
		};

	}

	Object.assign( StereoCamera.prototype, {

		update: function ( camera ) {

			var cache = this._cache;

			var 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/

				var projectionMatrix = camera.projectionMatrix.clone();
				var eyeSepHalf = cache.eyeSep / 2;
				var eyeSepOnProjection = eyeSepHalf * cache.near / cache.focus;
				var ymax = ( cache.near * Math.tan( MathUtils.DEG2RAD * cache.fov * 0.5 ) ) / cache.zoom;
				var 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 );

		}

	} );

	/**
	 * @author alteredq / http://alteredqualia.com/
	 */

	function Clock( autoStart ) {

		this.autoStart = ( autoStart !== undefined ) ? autoStart : true;

		this.startTime = 0;
		this.oldTime = 0;
		this.elapsedTime = 0;

		this.running = false;

	}

	Object.assign( Clock.prototype, {

		start: function () {

			this.startTime = ( typeof performance === 'undefined' ? Date : performance ).now(); // see #10732

			this.oldTime = this.startTime;
			this.elapsedTime = 0;
			this.running = true;

		},

		stop: function () {

			this.getElapsedTime();
			this.running = false;
			this.autoStart = false;

		},

		getElapsedTime: function () {

			this.getDelta();
			return this.elapsedTime;

		},

		getDelta: function () {

			var diff = 0;

			if ( this.autoStart && ! this.running ) {

				this.start();
				return 0;

			}

			if ( this.running ) {

				var newTime = ( typeof performance === 'undefined' ? Date : performance ).now();

				diff = ( newTime - this.oldTime ) / 1000;
				this.oldTime = newTime;

				this.elapsedTime += diff;

			}

			return diff;

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	var _position$2 = new Vector3();
	var _quaternion$3 = new Quaternion();
	var _scale$1 = new Vector3();
	var _orientation = new Vector3();

	function AudioListener() {

		Object3D.call( this );

		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();

	}

	AudioListener.prototype = Object.assign( Object.create( Object3D.prototype ), {

		constructor: AudioListener,

		getInput: function () {

			return this.gain;

		},

		removeFilter: function ( ) {

			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: function () {

			return this.filter;

		},

		setFilter: function ( 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: function () {

			return this.gain.gain.value;

		},

		setMasterVolume: function ( value ) {

			this.gain.gain.setTargetAtTime( value, this.context.currentTime, 0.01 );

			return this;

		},

		updateMatrixWorld: function ( force ) {

			Object3D.prototype.updateMatrixWorld.call( this, force );

			var listener = this.context.listener;
			var up = this.up;

			this.timeDelta = this._clock.getDelta();

			this.matrixWorld.decompose( _position$2, _quaternion$3, _scale$1 );

			_orientation.set( 0, 0, - 1 ).applyQuaternion( _quaternion$3 );

			if ( listener.positionX ) {

				// code path for Chrome (see #14393)

				var endTime = this.context.currentTime + this.timeDelta;

				listener.positionX.linearRampToValueAtTime( _position$2.x, endTime );
				listener.positionY.linearRampToValueAtTime( _position$2.y, endTime );
				listener.positionZ.linearRampToValueAtTime( _position$2.z, endTime );
				listener.forwardX.linearRampToValueAtTime( _orientation.x, endTime );
				listener.forwardY.linearRampToValueAtTime( _orientation.y, endTime );
				listener.forwardZ.linearRampToValueAtTime( _orientation.z, endTime );
				listener.upX.linearRampToValueAtTime( up.x, endTime );
				listener.upY.linearRampToValueAtTime( up.y, endTime );
				listener.upZ.linearRampToValueAtTime( up.z, endTime );

			} else {

				listener.setPosition( _position$2.x, _position$2.y, _position$2.z );
				listener.setOrientation( _orientation.x, _orientation.y, _orientation.z, up.x, up.y, up.z );

			}

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author Reece Aaron Lecrivain / http://reecenotes.com/
	 */

	function Audio( listener ) {

		Object3D.call( this );

		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.sourceType = 'empty';

		this._startedAt = 0;
		this._pausedAt = 0;

		this.filters = [];

	}

	Audio.prototype = Object.assign( Object.create( Object3D.prototype ), {

		constructor: Audio,

		getOutput: function () {

			return this.gain;

		},

		setNodeSource: function ( audioNode ) {

			this.hasPlaybackControl = false;
			this.sourceType = 'audioNode';
			this.source = audioNode;
			this.connect();

			return this;

		},

		setMediaElementSource: function ( mediaElement ) {

			this.hasPlaybackControl = false;
			this.sourceType = 'mediaNode';
			this.source = this.context.createMediaElementSource( mediaElement );
			this.connect();

			return this;

		},

		setMediaStreamSource: function ( mediaStream ) {

			this.hasPlaybackControl = false;
			this.sourceType = 'mediaStreamNode';
			this.source = this.context.createMediaStreamSource( mediaStream );
			this.connect();

			return this;

		},

		setBuffer: function ( audioBuffer ) {

			this.buffer = audioBuffer;
			this.sourceType = 'buffer';

			if ( this.autoplay ) { this.play(); }

			return this;

		},

		play: function ( delay ) {

			if ( delay === undefined ) { 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;

			var 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._pausedAt + this.offset, this.duration );

			this.isPlaying = true;

			this.source = source;

			this.setDetune( this.detune );
			this.setPlaybackRate( this.playbackRate );

			return this.connect();

		},

		pause: function () {

			if ( this.hasPlaybackControl === false ) {

				console.warn( 'THREE.Audio: this Audio has no playback control.' );
				return;

			}

			if ( this.isPlaying === true ) {

				this._pausedAt += Math.max( this.context.currentTime - this._startedAt, 0 ) * this.playbackRate;

				this.source.stop();
				this.source.onended = null;

				this.isPlaying = false;

			}

			return this;

		},

		stop: function () {

			if ( this.hasPlaybackControl === false ) {

				console.warn( 'THREE.Audio: this Audio has no playback control.' );
				return;

			}

			this._pausedAt = 0;

			this.source.stop();
			this.source.onended = null;
			this.isPlaying = false;

			return this;

		},

		connect: function () {

			if ( this.filters.length > 0 ) {

				this.source.connect( this.filters[ 0 ] );

				for ( var 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() );

			}

			return this;

		},

		disconnect: function () {

			if ( this.filters.length > 0 ) {

				this.source.disconnect( this.filters[ 0 ] );

				for ( var 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() );

			}

			return this;

		},

		getFilters: function () {

			return this.filters;

		},

		setFilters: function ( value ) {

			if ( ! value ) { value = []; }

			if ( this.isPlaying === true ) {

				this.disconnect();
				this.filters = value;
				this.connect();

			} else {

				this.filters = value;

			}

			return this;

		},

		setDetune: function ( value ) {

			this.detune = value;

			if ( this.source.detune === undefined ) { return; } // only set detune when available

			if ( this.isPlaying === true ) {

				this.source.detune.setTargetAtTime( this.detune, this.context.currentTime, 0.01 );

			}

			return this;

		},

		getDetune: function () {

			return this.detune;

		},

		getFilter: function () {

			return this.getFilters()[ 0 ];

		},

		setFilter: function ( filter ) {

			return this.setFilters( filter ? [ filter ] : [] );

		},

		setPlaybackRate: function ( 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: function () {

			return this.playbackRate;

		},

		onEnded: function () {

			this.isPlaying = false;

		},

		getLoop: function () {

			if ( this.hasPlaybackControl === false ) {

				console.warn( 'THREE.Audio: this Audio has no playback control.' );
				return false;

			}

			return this.loop;

		},

		setLoop: function ( 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: function ( value ) {

			this.loopStart = value;

			return this;

		},

		setLoopEnd: function ( value ) {

			this.loopEnd = value;

			return this;

		},

		getVolume: function () {

			return this.gain.gain.value;

		},

		setVolume: function ( value ) {

			this.gain.gain.setTargetAtTime( value, this.context.currentTime, 0.01 );

			return this;

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	var _position$3 = new Vector3();
	var _quaternion$4 = new Quaternion();
	var _scale$2 = new Vector3();
	var _orientation$1 = new Vector3();

	function PositionalAudio( listener ) {

		Audio.call( this, listener );

		this.panner = this.context.createPanner();
		this.panner.panningModel = 'HRTF';
		this.panner.connect( this.gain );

	}

	PositionalAudio.prototype = Object.assign( Object.create( Audio.prototype ), {

		constructor: PositionalAudio,

		getOutput: function () {

			return this.panner;

		},

		getRefDistance: function () {

			return this.panner.refDistance;

		},

		setRefDistance: function ( value ) {

			this.panner.refDistance = value;

			return this;

		},

		getRolloffFactor: function () {

			return this.panner.rolloffFactor;

		},

		setRolloffFactor: function ( value ) {

			this.panner.rolloffFactor = value;

			return this;

		},

		getDistanceModel: function () {

			return this.panner.distanceModel;

		},

		setDistanceModel: function ( value ) {

			this.panner.distanceModel = value;

			return this;

		},

		getMaxDistance: function () {

			return this.panner.maxDistance;

		},

		setMaxDistance: function ( value ) {

			this.panner.maxDistance = value;

			return this;

		},

		setDirectionalCone: function ( coneInnerAngle, coneOuterAngle, coneOuterGain ) {

			this.panner.coneInnerAngle = coneInnerAngle;
			this.panner.coneOuterAngle = coneOuterAngle;
			this.panner.coneOuterGain = coneOuterGain;

			return this;

		},

		updateMatrixWorld: function ( force ) {

			Object3D.prototype.updateMatrixWorld.call( this, force );

			if ( this.hasPlaybackControl === true && this.isPlaying === false ) { return; }

			this.matrixWorld.decompose( _position$3, _quaternion$4, _scale$2 );

			_orientation$1.set( 0, 0, 1 ).applyQuaternion( _quaternion$4 );

			var panner = this.panner;

			if ( panner.positionX ) {

				// code path for Chrome and Firefox (see #14393)

				var endTime = this.context.currentTime + this.listener.timeDelta;

				panner.positionX.linearRampToValueAtTime( _position$3.x, endTime );
				panner.positionY.linearRampToValueAtTime( _position$3.y, endTime );
				panner.positionZ.linearRampToValueAtTime( _position$3.z, endTime );
				panner.orientationX.linearRampToValueAtTime( _orientation$1.x, endTime );
				panner.orientationY.linearRampToValueAtTime( _orientation$1.y, endTime );
				panner.orientationZ.linearRampToValueAtTime( _orientation$1.z, endTime );

			} else {

				panner.setPosition( _position$3.x, _position$3.y, _position$3.z );
				panner.setOrientation( _orientation$1.x, _orientation$1.y, _orientation$1.z );

			}

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function AudioAnalyser( audio, fftSize ) {

		this.analyser = audio.context.createAnalyser();
		this.analyser.fftSize = fftSize !== undefined ? fftSize : 2048;

		this.data = new Uint8Array( this.analyser.frequencyBinCount );

		audio.getOutput().connect( this.analyser );

	}

	Object.assign( AudioAnalyser.prototype, {

		getFrequencyData: function () {

			this.analyser.getByteFrequencyData( this.data );

			return this.data;

		},

		getAverageFrequency: function () {

			var value = 0, data = this.getFrequencyData();

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

				value += data[ i ];

			}

			return value / data.length;

		}

	} );

	/**
	 *
	 * Buffered scene graph property that allows weighted accumulation.
	 *
	 *
	 * @author Ben Houston / http://clara.io/
	 * @author David Sarno / http://lighthaus.us/
	 * @author tschw
	 */

	function PropertyMixer( binding, typeName, valueSize ) {

		this.binding = binding;
		this.valueSize = valueSize;

		var bufferType = Float64Array,
			mixFunction;

		switch ( typeName ) {

			case 'quaternion':
				mixFunction = this._slerp;
				break;

			case 'string':
			case 'bool':
				bufferType = Array;
				mixFunction = this._select;
				break;

			default:
				mixFunction = this._lerp;

		}

		this.buffer = new bufferType( valueSize * 4 );
		// layout: [ incoming | accu0 | accu1 | orig ]
		//
		// 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

		this._mixBufferRegion = mixFunction;

		this.cumulativeWeight = 0;

		this.useCount = 0;
		this.referenceCount = 0;

	}

	Object.assign( PropertyMixer.prototype, {

		// accumulate data in the 'incoming' region into 'accu<i>'
		accumulate: function ( 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

			var buffer = this.buffer,
				stride = this.valueSize,
				offset = accuIndex * stride + stride,

				currentWeight = this.cumulativeWeight;

			if ( currentWeight === 0 ) {

				// accuN := incoming * weight

				for ( var i = 0; i !== stride; ++ i ) {

					buffer[ offset + i ] = buffer[ i ];

				}

				currentWeight = weight;

			} else {

				// accuN := accuN + incoming * weight

				currentWeight += weight;
				var mix = weight / currentWeight;
				this._mixBufferRegion( buffer, offset, 0, mix, stride );

			}

			this.cumulativeWeight = currentWeight;

		},

		// apply the state of 'accu<i>' to the binding when accus differ
		apply: function ( accuIndex ) {

			var stride = this.valueSize,
				buffer = this.buffer,
				offset = accuIndex * stride + stride,

				weight = this.cumulativeWeight,

				binding = this.binding;

			this.cumulativeWeight = 0;

			if ( weight < 1 ) {

				// accuN := accuN + original * ( 1 - cumulativeWeight )

				var originalValueOffset = stride * 3;

				this._mixBufferRegion(
					buffer, offset, originalValueOffset, 1 - weight, stride );

			}

			for ( var 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: function () {

			var binding = this.binding;

			var buffer = this.buffer,
				stride = this.valueSize,

				originalValueOffset = stride * 3;

			binding.getValue( buffer, originalValueOffset );

			// accu[0..1] := orig -- initially detect changes against the original
			for ( var i = stride, e = originalValueOffset; i !== e; ++ i ) {

				buffer[ i ] = buffer[ originalValueOffset + ( i % stride ) ];

			}

			this.cumulativeWeight = 0;

		},

		// apply the state previously taken via 'saveOriginalState' to the binding
		restoreOriginalState: function () {

			var originalValueOffset = this.valueSize * 3;
			this.binding.setValue( this.buffer, originalValueOffset );

		},


		// mix functions

		_select: function ( buffer, dstOffset, srcOffset, t, stride ) {

			if ( t >= 0.5 ) {

				for ( var i = 0; i !== stride; ++ i ) {

					buffer[ dstOffset + i ] = buffer[ srcOffset + i ];

				}

			}

		},

		_slerp: function ( buffer, dstOffset, srcOffset, t ) {

			Quaternion.slerpFlat( buffer, dstOffset, buffer, dstOffset, buffer, srcOffset, t );

		},

		_lerp: function ( buffer, dstOffset, srcOffset, t, stride ) {

			var s = 1 - t;

			for ( var i = 0; i !== stride; ++ i ) {

				var j = dstOffset + i;

				buffer[ j ] = buffer[ j ] * s + buffer[ srcOffset + i ] * t;

			}

		}

	} );

	/**
	 *
	 * A reference to a real property in the scene graph.
	 *
	 *
	 * @author Ben Houston / http://clara.io/
	 * @author David Sarno / http://lighthaus.us/
	 * @author tschw
	 */

	// Characters [].:/ are reserved for track binding syntax.
	var _RESERVED_CHARS_RE = '\\[\\]\\.:\\/';
	var _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.
	var _wordChar = '[^' + _RESERVED_CHARS_RE + ']';
	var _wordCharOrDot = '[^' + _RESERVED_CHARS_RE.replace( '\\.', '' ) + ']';

	// Parent directories, delimited by '/' or ':'. Currently unused, but must
	// be matched to parse the rest of the track name.
	var _directoryRe = /((?:WC+[\/:])*)/.source.replace( 'WC', _wordChar );

	// Target node. May contain word characters (a-zA-Z0-9_) and '.' or '-'.
	var _nodeRe = /(WCOD+)?/.source.replace( 'WCOD', _wordCharOrDot );

	// Object on target node, and accessor. May not contain reserved
	// characters. Accessor may contain any character except closing bracket.
	var _objectRe = /(?:\.(WC+)(?:\[(.+)\])?)?/.source.replace( 'WC', _wordChar );

	// Property and accessor. May not contain reserved characters. Accessor may
	// contain any non-bracket characters.
	var _propertyRe = /\.(WC+)(?:\[(.+)\])?/.source.replace( 'WC', _wordChar );

	var _trackRe = new RegExp( ''
		+ '^'
		+ _directoryRe
		+ _nodeRe
		+ _objectRe
		+ _propertyRe
		+ '$'
	);

	var _supportedObjectNames = [ 'material', 'materials', 'bones' ];

	function Composite( targetGroup, path, optionalParsedPath ) {

		var parsedPath = optionalParsedPath || PropertyBinding.parseTrackName( path );

		this._targetGroup = targetGroup;
		this._bindings = targetGroup.subscribe_( path, parsedPath );

	}

	Object.assign( Composite.prototype, {

		getValue: function ( array, offset ) {

			this.bind(); // bind all binding

			var firstValidIndex = this._targetGroup.nCachedObjects_,
				binding = this._bindings[ firstValidIndex ];

			// and only call .getValue on the first
			if ( binding !== undefined ) { binding.getValue( array, offset ); }

		},

		setValue: function ( array, offset ) {

			var bindings = this._bindings;

			for ( var i = this._targetGroup.nCachedObjects_, n = bindings.length; i !== n; ++ i ) {

				bindings[ i ].setValue( array, offset );

			}

		},

		bind: function () {

			var bindings = this._bindings;

			for ( var i = this._targetGroup.nCachedObjects_, n = bindings.length; i !== n; ++ i ) {

				bindings[ i ].bind();

			}

		},

		unbind: function () {

			var bindings = this._bindings;

			for ( var i = this._targetGroup.nCachedObjects_, n = bindings.length; i !== n; ++ i ) {

				bindings[ i ].unbind();

			}

		}

	} );


	function PropertyBinding( rootNode, path, parsedPath ) {

		this.path = path;
		this.parsedPath = parsedPath || PropertyBinding.parseTrackName( path );

		this.node = PropertyBinding.findNode( rootNode, this.parsedPath.nodeName ) || rootNode;

		this.rootNode = rootNode;

	}

	Object.assign( PropertyBinding, {

		Composite: Composite,

		create: function ( 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}
		 */
		sanitizeNodeName: function ( name ) {

			return name.replace( /\s/g, '_' ).replace( _reservedRe, '' );

		},

		parseTrackName: function ( trackName ) {

			var matches = _trackRe.exec( trackName );

			if ( ! matches ) {

				throw new Error( 'PropertyBinding: Cannot parse trackName: ' + trackName );

			}

			var results = {
				// directoryName: matches[ 1 ], // (tschw) currently unused
				nodeName: matches[ 2 ],
				objectName: matches[ 3 ],
				objectIndex: matches[ 4 ],
				propertyName: matches[ 5 ], // required
				propertyIndex: matches[ 6 ]
			};

			var lastDot = results.nodeName && results.nodeName.lastIndexOf( '.' );

			if ( lastDot !== undefined && lastDot !== - 1 ) {

				var objectName = results.nodeName.substring( lastDot + 1 );

				// Object names must be checked against a whitelist. 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;

		},

		findNode: function ( root, nodeName ) {

			if ( ! nodeName || nodeName === "" || nodeName === "." || nodeName === - 1 || nodeName === root.name || nodeName === root.uuid ) {

				return root;

			}

			// search into skeleton bones.
			if ( root.skeleton ) {

				var bone = root.skeleton.getBoneByName( nodeName );

				if ( bone !== undefined ) {

					return bone;

				}

			}

			// search into node subtree.
			if ( root.children ) {

				var searchNodeSubtree = function ( children ) {

					for ( var i = 0; i < children.length; i ++ ) {

						var childNode = children[ i ];

						if ( childNode.name === nodeName || childNode.uuid === nodeName ) {

							return childNode;

						}

						var result = searchNodeSubtree( childNode.children );

						if ( result ) { return result; }

					}

					return null;

				};

				var subTreeNode = searchNodeSubtree( root.children );

				if ( subTreeNode ) {

					return subTreeNode;

				}

			}

			return null;

		}

	} );

	Object.assign( PropertyBinding.prototype, { // prototype, continued

		// these are used to "bind" a nonexistent property
		_getValue_unavailable: function () {},
		_setValue_unavailable: function () {},

		BindingType: {
			Direct: 0,
			EntireArray: 1,
			ArrayElement: 2,
			HasFromToArray: 3
		},

		Versioning: {
			None: 0,
			NeedsUpdate: 1,
			MatrixWorldNeedsUpdate: 2
		},

		GetterByBindingType: [

			function getValue_direct( buffer, offset ) {

				buffer[ offset ] = this.node[ this.propertyName ];

			},

			function getValue_array( buffer, offset ) {

				var source = this.resolvedProperty;

				for ( var i = 0, n = source.length; i !== n; ++ i ) {

					buffer[ offset ++ ] = source[ i ];

				}

			},

			function getValue_arrayElement( buffer, offset ) {

				buffer[ offset ] = this.resolvedProperty[ this.propertyIndex ];

			},

			function getValue_toArray( buffer, offset ) {

				this.resolvedProperty.toArray( buffer, offset );

			}

		],

		SetterByBindingTypeAndVersioning: [

			[
				// Direct

				function setValue_direct( buffer, offset ) {

					this.targetObject[ this.propertyName ] = buffer[ offset ];

				},

				function setValue_direct_setNeedsUpdate( buffer, offset ) {

					this.targetObject[ this.propertyName ] = buffer[ offset ];
					this.targetObject.needsUpdate = true;

				},

				function setValue_direct_setMatrixWorldNeedsUpdate( buffer, offset ) {

					this.targetObject[ this.propertyName ] = buffer[ offset ];
					this.targetObject.matrixWorldNeedsUpdate = true;

				}

			], [

				// EntireArray

				function setValue_array( buffer, offset ) {

					var dest = this.resolvedProperty;

					for ( var i = 0, n = dest.length; i !== n; ++ i ) {

						dest[ i ] = buffer[ offset ++ ];

					}

				},

				function setValue_array_setNeedsUpdate( buffer, offset ) {

					var dest = this.resolvedProperty;

					for ( var i = 0, n = dest.length; i !== n; ++ i ) {

						dest[ i ] = buffer[ offset ++ ];

					}

					this.targetObject.needsUpdate = true;

				},

				function setValue_array_setMatrixWorldNeedsUpdate( buffer, offset ) {

					var dest = this.resolvedProperty;

					for ( var i = 0, n = dest.length; i !== n; ++ i ) {

						dest[ i ] = buffer[ offset ++ ];

					}

					this.targetObject.matrixWorldNeedsUpdate = true;

				}

			], [

				// ArrayElement

				function setValue_arrayElement( buffer, offset ) {

					this.resolvedProperty[ this.propertyIndex ] = buffer[ offset ];

				},

				function setValue_arrayElement_setNeedsUpdate( buffer, offset ) {

					this.resolvedProperty[ this.propertyIndex ] = buffer[ offset ];
					this.targetObject.needsUpdate = true;

				},

				function setValue_arrayElement_setMatrixWorldNeedsUpdate( buffer, offset ) {

					this.resolvedProperty[ this.propertyIndex ] = buffer[ offset ];
					this.targetObject.matrixWorldNeedsUpdate = true;

				}

			], [

				// HasToFromArray

				function setValue_fromArray( buffer, offset ) {

					this.resolvedProperty.fromArray( buffer, offset );

				},

				function setValue_fromArray_setNeedsUpdate( buffer, offset ) {

					this.resolvedProperty.fromArray( buffer, offset );
					this.targetObject.needsUpdate = true;

				},

				function setValue_fromArray_setMatrixWorldNeedsUpdate( buffer, offset ) {

					this.resolvedProperty.fromArray( buffer, offset );
					this.targetObject.matrixWorldNeedsUpdate = true;

				}

			]

		],

		getValue: function getValue_unbound( targetArray, offset ) {

			this.bind();
			this.getValue( targetArray, offset );

			// 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.

		},

		setValue: function getValue_unbound( sourceArray, offset ) {

			this.bind();
			this.setValue( sourceArray, offset );

		},

		// create getter / setter pair for a property in the scene graph
		bind: function () {

			var targetObject = this.node,
				parsedPath = this.parsedPath,

				objectName = parsedPath.objectName,
				propertyName = parsedPath.propertyName,
				propertyIndex = parsedPath.propertyIndex;

			if ( ! targetObject ) {

				targetObject = PropertyBinding.findNode( this.rootNode, parsedPath.nodeName ) || this.rootNode;

				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.error( 'THREE.PropertyBinding: Trying to update node for track: ' + this.path + ' but it wasn\'t found.' );
				return;

			}

			if ( objectName ) {

				var 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 ( var i = 0; i < targetObject.length; i ++ ) {

							if ( targetObject[ i ].name === objectIndex ) {

								objectIndex = i;
								break;

							}

						}

						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
			var nodeProperty = targetObject[ propertyName ];

			if ( nodeProperty === undefined ) {

				var 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
			var 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
			var 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.isBufferGeometry ) {

						if ( ! targetObject.geometry.morphAttributes ) {

							console.error( 'THREE.PropertyBinding: Can not bind to morphTargetInfluences because node does not have a geometry.morphAttributes.', this );
							return;

						}

						for ( var i = 0; i < this.node.geometry.morphAttributes.position.length; i ++ ) {

							if ( targetObject.geometry.morphAttributes.position[ i ].name === propertyIndex ) {

								propertyIndex = i;
								break;

							}

						}


					} else {

						if ( ! targetObject.geometry.morphTargets ) {

							console.error( 'THREE.PropertyBinding: Can not bind to morphTargetInfluences because node does not have a geometry.morphTargets.', this );
							return;

						}

						for ( var i = 0; i < this.node.geometry.morphTargets.length; i ++ ) {

							if ( targetObject.geometry.morphTargets[ i ].name === propertyIndex ) {

								propertyIndex = i;
								break;

							}

						}

					}

				}

				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: function () {

			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;

		}

	} );

	//!\ DECLARE ALIAS AFTER assign prototype !
	Object.assign( PropertyBinding.prototype, {

		// initial state of these methods that calls 'bind'
		_getValue_unbound: PropertyBinding.prototype.getValue,
		_setValue_unbound: PropertyBinding.prototype.setValue,

	} );

	/**
	 *
	 * 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.
	 *
	 * @author tschw
	 */

	function AnimationObjectGroup() {

		this.uuid = MathUtils.generateUUID();

		// cached objects followed by the active ones
		this._objects = Array.prototype.slice.call( arguments );

		this.nCachedObjects_ = 0; // threshold
		// note: read by PropertyBinding.Composite

		var indices = {};
		this._indicesByUUID = indices; // for bookkeeping

		for ( var 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

		var scope = this;

		this.stats = {

			objects: {
				get total() {

					return scope._objects.length;

				},
				get inUse() {

					return this.total - scope.nCachedObjects_;

				}
			},
			get bindingsPerObject() {

				return scope._bindings.length;

			}

		};

	}

	Object.assign( AnimationObjectGroup.prototype, {

		isAnimationObjectGroup: true,

		add: function () {

			var objects = this._objects,
				nObjects = objects.length,
				nCachedObjects = this.nCachedObjects_,
				indicesByUUID = this._indicesByUUID,
				paths = this._paths,
				parsedPaths = this._parsedPaths,
				bindings = this._bindings,
				nBindings = bindings.length,
				knownObject = undefined;

			for ( var i = 0, n = arguments.length; i !== n; ++ i ) {

				var object = arguments[ i ],
					uuid = object.uuid,
					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 ( var 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

					var 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 ( var j = 0, m = nBindings; j !== m; ++ j ) {

						var bindingsForPath = bindings[ j ],
							lastCached = bindingsForPath[ firstActiveIndex ],
							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: function () {

			var objects = this._objects,
				nCachedObjects = this.nCachedObjects_,
				indicesByUUID = this._indicesByUUID,
				bindings = this._bindings,
				nBindings = bindings.length;

			for ( var i = 0, n = arguments.length; i !== n; ++ i ) {

				var object = arguments[ i ],
					uuid = object.uuid,
					index = indicesByUUID[ uuid ];

				if ( index !== undefined && index >= nCachedObjects ) {

					// move existing object into the CACHED region

					var 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 ( var j = 0, m = nBindings; j !== m; ++ j ) {

						var bindingsForPath = bindings[ j ],
							firstActive = bindingsForPath[ lastCachedIndex ],
							binding = bindingsForPath[ index ];

						bindingsForPath[ index ] = firstActive;
						bindingsForPath[ lastCachedIndex ] = binding;

					}

				}

			} // for arguments

			this.nCachedObjects_ = nCachedObjects;

		},

		// remove & forget
		uncache: function () {

			var objects = this._objects,
				nObjects = objects.length,
				nCachedObjects = this.nCachedObjects_,
				indicesByUUID = this._indicesByUUID,
				bindings = this._bindings,
				nBindings = bindings.length;

			for ( var i = 0, n = arguments.length; i !== n; ++ i ) {

				var 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

						var 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 ( var j = 0, m = nBindings; j !== m; ++ j ) {

							var 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

						var lastIndex = -- nObjects,
							lastObject = objects[ lastIndex ];

						indicesByUUID[ lastObject.uuid ] = index;
						objects[ index ] = lastObject;
						objects.pop();

						// accounting is done, now do the same for all bindings

						for ( var j = 0, m = nBindings; j !== m; ++ j ) {

							var 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_: function ( path, parsedPath ) {

			// returns an array of bindings for the given path that is changed
			// according to the contained objects in the group

			var indicesByPath = this._bindingsIndicesByPath,
				index = indicesByPath[ path ],
				bindings = this._bindings;

			if ( index !== undefined ) { return bindings[ index ]; }

			var 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 ( var i = nCachedObjects, n = objects.length; i !== n; ++ i ) {

				var object = objects[ i ];
				bindingsForPath[ i ] = new PropertyBinding( object, path, parsedPath );

			}

			return bindingsForPath;

		},

		unsubscribe_: function ( path ) {

			// tells the group to forget about a property path and no longer
			// update the array previously obtained with 'subscribe_'

			var indicesByPath = this._bindingsIndicesByPath,
				index = indicesByPath[ path ];

			if ( index !== undefined ) {

				var 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();

			}

		}

	} );

	/**
	 *
	 * Action provided by AnimationMixer for scheduling clip playback on specific
	 * objects.
	 *
	 * @author Ben Houston / http://clara.io/
	 * @author David Sarno / http://lighthaus.us/
	 * @author tschw
	 *
	 */

	function AnimationAction( mixer, clip, localRoot ) {

		this._mixer = mixer;
		this._clip = clip;
		this._localRoot = localRoot || null;

		var tracks = clip.tracks,
			nTracks = tracks.length,
			interpolants = new Array( nTracks );

		var interpolantSettings = {
			endingStart: ZeroCurvatureEnding,
			endingEnd: ZeroCurvatureEnding
		};

		for ( var i = 0; i !== nTracks; ++ i ) {

			var 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

	}

	Object.assign( AnimationAction.prototype, {

		// State & Scheduling

		play: function () {

			this._mixer._activateAction( this );

			return this;

		},

		stop: function () {

			this._mixer._deactivateAction( this );

			return this.reset();

		},

		reset: function () {

			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: function () {

			return this.enabled && ! this.paused && this.timeScale !== 0 &&
				this._startTime === null && this._mixer._isActiveAction( this );

		},

		// return true when play has been called
		isScheduled: function () {

			return this._mixer._isActiveAction( this );

		},

		startAt: function ( time ) {

			this._startTime = time;

			return this;

		},

		setLoop: function ( 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: function ( 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: function () {

			return this._effectiveWeight;

		},

		fadeIn: function ( duration ) {

			return this._scheduleFading( duration, 0, 1 );

		},

		fadeOut: function ( duration ) {

			return this._scheduleFading( duration, 1, 0 );

		},

		crossFadeFrom: function ( fadeOutAction, duration, warp ) {

			fadeOutAction.fadeOut( duration );
			this.fadeIn( duration );

			if ( warp ) {

				var 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: function ( fadeInAction, duration, warp ) {

			return fadeInAction.crossFadeFrom( this, duration, warp );

		},

		stopFading: function () {

			var 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: function ( timeScale ) {

			this.timeScale = timeScale;
			this._effectiveTimeScale = this.paused ? 0 : timeScale;

			return this.stopWarping();

		},

		// return the time scale considering warping and .paused
		getEffectiveTimeScale: function () {

			return this._effectiveTimeScale;

		},

		setDuration: function ( duration ) {

			this.timeScale = this._clip.duration / duration;

			return this.stopWarping();

		},

		syncWith: function ( action ) {

			this.time = action.time;
			this.timeScale = action.timeScale;

			return this.stopWarping();

		},

		halt: function ( duration ) {

			return this.warp( this._effectiveTimeScale, 0, duration );

		},

		warp: function ( startTimeScale, endTimeScale, duration ) {

			var mixer = this._mixer, now = mixer.time,
				interpolant = this._timeScaleInterpolant,

				timeScale = this.timeScale;

			if ( interpolant === null ) {

				interpolant = mixer._lendControlInterpolant();
				this._timeScaleInterpolant = interpolant;

			}

			var times = interpolant.parameterPositions,
				values = interpolant.sampleValues;

			times[ 0 ] = now;
			times[ 1 ] = now + duration;

			values[ 0 ] = startTimeScale / timeScale;
			values[ 1 ] = endTimeScale / timeScale;

			return this;

		},

		stopWarping: function () {

			var timeScaleInterpolant = this._timeScaleInterpolant;

			if ( timeScaleInterpolant !== null ) {

				this._timeScaleInterpolant = null;
				this._mixer._takeBackControlInterpolant( timeScaleInterpolant );

			}

			return this;

		},

		// Object Accessors

		getMixer: function () {

			return this._mixer;

		},

		getClip: function () {

			return this._clip;

		},

		getRoot: function () {

			return this._localRoot || this._mixer._root;

		},

		// Interna

		_update: function ( time, deltaTime, timeDirection, accuIndex ) {

			// called by the mixer

			if ( ! this.enabled ) {

				// call ._updateWeight() to update ._effectiveWeight

				this._updateWeight( time );
				return;

			}

			var startTime = this._startTime;

			if ( startTime !== null ) {

				// check for scheduled start of action

				var timeRunning = ( time - startTime ) * timeDirection;
				if ( timeRunning < 0 || timeDirection === 0 ) {

					return; // yet to come / don't decide when delta = 0

				}

				// start

				this._startTime = null; // unschedule
				deltaTime = timeDirection * timeRunning;

			}

			// apply time scale and advance time

			deltaTime *= this._updateTimeScale( time );
			var clipTime = this._updateTime( deltaTime );

			// note: _updateTime may disable the action resulting in
			// an effective weight of 0

			var weight = this._updateWeight( time );

			if ( weight > 0 ) {

				var interpolants = this._interpolants;
				var propertyMixers = this._propertyBindings;

				for ( var j = 0, m = interpolants.length; j !== m; ++ j ) {

					interpolants[ j ].evaluate( clipTime );
					propertyMixers[ j ].accumulate( accuIndex, weight );

				}

			}

		},

		_updateWeight: function ( time ) {

			var weight = 0;

			if ( this.enabled ) {

				weight = this.weight;
				var interpolant = this._weightInterpolant;

				if ( interpolant !== null ) {

					var 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: function ( time ) {

			var timeScale = 0;

			if ( ! this.paused ) {

				timeScale = this.timeScale;

				var interpolant = this._timeScaleInterpolant;

				if ( interpolant !== null ) {

					var 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: function ( deltaTime ) {

			var time = this.time + deltaTime;
			var duration = this._clip.duration;
			var loop = this.loop;
			var loopCount = this._loopCount;

			var 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

					var loopDelta = Math.floor( time / duration ); // signed
					time -= duration * loopDelta;

					loopCount += Math.abs( loopDelta );

					var 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

							var 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: function ( atStart, atEnd, pingPong ) {

			var 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: function ( duration, weightNow, weightThen ) {

			var mixer = this._mixer, now = mixer.time,
				interpolant = this._weightInterpolant;

			if ( interpolant === null ) {

				interpolant = mixer._lendControlInterpolant();
				this._weightInterpolant = interpolant;

			}

			var times = interpolant.parameterPositions,
				values = interpolant.sampleValues;

			times[ 0 ] = now;
			values[ 0 ] = weightNow;
			times[ 1 ] = now + duration;
			values[ 1 ] = weightThen;

			return this;

		}

	} );

	/**
	 *
	 * Player for AnimationClips.
	 *
	 *
	 * @author Ben Houston / http://clara.io/
	 * @author David Sarno / http://lighthaus.us/
	 * @author tschw
	 */

	function AnimationMixer( root ) {

		this._root = root;
		this._initMemoryManager();
		this._accuIndex = 0;

		this.time = 0;

		this.timeScale = 1.0;

	}

	AnimationMixer.prototype = Object.assign( Object.create( EventDispatcher.prototype ), {

		constructor: AnimationMixer,

		_bindAction: function ( action, prototypeAction ) {

			var root = action._localRoot || this._root,
				tracks = action._clip.tracks,
				nTracks = tracks.length,
				bindings = action._propertyBindings,
				interpolants = action._interpolants,
				rootUuid = root.uuid,
				bindingsByRoot = this._bindingsByRootAndName,
				bindingsByName = bindingsByRoot[ rootUuid ];

			if ( bindingsByName === undefined ) {

				bindingsByName = {};
				bindingsByRoot[ rootUuid ] = bindingsByName;

			}

			for ( var i = 0; i !== nTracks; ++ i ) {

				var track = tracks[ i ],
					trackName = track.name,
					binding = bindingsByName[ trackName ];

				if ( binding !== undefined ) {

					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;

					}

					var 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: function ( 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

					var 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 );

				}

				var bindings = action._propertyBindings;

				// increment reference counts / sort out state
				for ( var i = 0, n = bindings.length; i !== n; ++ i ) {

					var binding = bindings[ i ];

					if ( binding.useCount ++ === 0 ) {

						this._lendBinding( binding );
						binding.saveOriginalState();

					}

				}

				this._lendAction( action );

			}

		},

		_deactivateAction: function ( action ) {

			if ( this._isActiveAction( action ) ) {

				var bindings = action._propertyBindings;

				// decrement reference counts / sort out state
				for ( var i = 0, n = bindings.length; i !== n; ++ i ) {

					var binding = bindings[ i ];

					if ( -- binding.useCount === 0 ) {

						binding.restoreOriginalState();
						this._takeBackBinding( binding );

					}

				}

				this._takeBackAction( action );

			}

		},

		// Memory manager

		_initMemoryManager: function () {

			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;

			var 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: function ( action ) {

			var index = action._cacheIndex;
			return index !== null && index < this._nActiveActions;

		},

		_addInactiveAction: function ( action, clipUuid, rootUuid ) {

			var actions = this._actions,
				actionsByClip = this._actionsByClip,
				actionsForClip = actionsByClip[ clipUuid ];

			if ( actionsForClip === undefined ) {

				actionsForClip = {

					knownActions: [ action ],
					actionByRoot: {}

				};

				action._byClipCacheIndex = 0;

				actionsByClip[ clipUuid ] = actionsForClip;

			} else {

				var knownActions = actionsForClip.knownActions;

				action._byClipCacheIndex = knownActions.length;
				knownActions.push( action );

			}

			action._cacheIndex = actions.length;
			actions.push( action );

			actionsForClip.actionByRoot[ rootUuid ] = action;

		},

		_removeInactiveAction: function ( action ) {

			var actions = this._actions,
				lastInactiveAction = actions[ actions.length - 1 ],
				cacheIndex = action._cacheIndex;

			lastInactiveAction._cacheIndex = cacheIndex;
			actions[ cacheIndex ] = lastInactiveAction;
			actions.pop();

			action._cacheIndex = null;


			var 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;


			var actionByRoot = actionsForClip.actionByRoot,
				rootUuid = ( action._localRoot || this._root ).uuid;

			delete actionByRoot[ rootUuid ];

			if ( knownActionsForClip.length === 0 ) {

				delete actionsByClip[ clipUuid ];

			}

			this._removeInactiveBindingsForAction( action );

		},

		_removeInactiveBindingsForAction: function ( action ) {

			var bindings = action._propertyBindings;
			for ( var i = 0, n = bindings.length; i !== n; ++ i ) {

				var binding = bindings[ i ];

				if ( -- binding.referenceCount === 0 ) {

					this._removeInactiveBinding( binding );

				}

			}

		},

		_lendAction: function ( action ) {

			// [ active actions |  inactive actions  ]
			// [  active actions >| inactive actions ]
			//                 s        a
			//                  <-swap->
			//                 a        s

			var 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: function ( action ) {

			// [  active actions  | inactive actions ]
			// [ active actions |< inactive actions  ]
			//        a        s
			//         <-swap->
			//        s        a

			var 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: function ( binding, rootUuid, trackName ) {

			var bindingsByRoot = this._bindingsByRootAndName,
				bindingByName = bindingsByRoot[ rootUuid ],

				bindings = this._bindings;

			if ( bindingByName === undefined ) {

				bindingByName = {};
				bindingsByRoot[ rootUuid ] = bindingByName;

			}

			bindingByName[ trackName ] = binding;

			binding._cacheIndex = bindings.length;
			bindings.push( binding );

		},

		_removeInactiveBinding: function ( binding ) {

			var 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: function ( binding ) {

			var 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: function ( binding ) {

			var 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: function () {

			var interpolants = this._controlInterpolants,
				lastActiveIndex = this._nActiveControlInterpolants ++,
				interpolant = interpolants[ lastActiveIndex ];

			if ( interpolant === undefined ) {

				interpolant = new LinearInterpolant(
					new Float32Array( 2 ), new Float32Array( 2 ),
					1, this._controlInterpolantsResultBuffer );

				interpolant.__cacheIndex = lastActiveIndex;
				interpolants[ lastActiveIndex ] = interpolant;

			}

			return interpolant;

		},

		_takeBackControlInterpolant: function ( interpolant ) {

			var interpolants = this._controlInterpolants,
				prevIndex = interpolant.__cacheIndex,

				firstInactiveIndex = -- this._nActiveControlInterpolants,

				lastActiveInterpolant = interpolants[ firstInactiveIndex ];

			interpolant.__cacheIndex = firstInactiveIndex;
			interpolants[ firstInactiveIndex ] = interpolant;

			lastActiveInterpolant.__cacheIndex = prevIndex;
			interpolants[ prevIndex ] = lastActiveInterpolant;

		},

		_controlInterpolantsResultBuffer: new Float32Array( 1 ),

		// 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: function ( clip, optionalRoot ) {

			var root = optionalRoot || this._root,
				rootUuid = root.uuid,

				clipObject = typeof clip === 'string' ?
					AnimationClip.findByName( root, clip ) : clip,

				clipUuid = clipObject !== null ? clipObject.uuid : clip,

				actionsForClip = this._actionsByClip[ clipUuid ],
				prototypeAction = null;

			if ( actionsForClip !== undefined ) {

				var existingAction =
						actionsForClip.actionByRoot[ rootUuid ];

				if ( existingAction !== undefined ) {

					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
			var newAction = new AnimationAction( this, clipObject, optionalRoot );

			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: function ( clip, optionalRoot ) {

			var 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: function () {

			var actions = this._actions,
				nActions = this._nActiveActions,
				bindings = this._bindings,
				nBindings = this._nActiveBindings;

			this._nActiveActions = 0;
			this._nActiveBindings = 0;

			for ( var i = 0; i !== nActions; ++ i ) {

				actions[ i ].reset();

			}

			for ( var i = 0; i !== nBindings; ++ i ) {

				bindings[ i ].useCount = 0;

			}

			return this;

		},

		// advance the time and update apply the animation
		update: function ( deltaTime ) {

			deltaTime *= this.timeScale;

			var actions = this._actions,
				nActions = this._nActiveActions,

				time = this.time += deltaTime,
				timeDirection = Math.sign( deltaTime ),

				accuIndex = this._accuIndex ^= 1;

			// run active actions

			for ( var i = 0; i !== nActions; ++ i ) {

				var action = actions[ i ];

				action._update( time, deltaTime, timeDirection, accuIndex );

			}

			// update scene graph

			var bindings = this._bindings,
				nBindings = this._nActiveBindings;

			for ( var i = 0; i !== nBindings; ++ i ) {

				bindings[ i ].apply( accuIndex );

			}

			return this;

		},

		// Allows you to seek to a specific time in an animation.
		setTime: function ( timeInSeconds ) {

			this.time = 0; // Zero out time attribute for AnimationMixer object;
			for ( var 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: function () {

			return this._root;

		},

		// free all resources specific to a particular clip
		uncacheClip: function ( clip ) {

			var 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

				var actionsToRemove = actionsForClip.knownActions;

				for ( var i = 0, n = actionsToRemove.length; i !== n; ++ i ) {

					var action = actionsToRemove[ i ];

					this._deactivateAction( action );

					var 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: function ( root ) {

			var rootUuid = root.uuid,
				actionsByClip = this._actionsByClip;

			for ( var clipUuid in actionsByClip ) {

				var actionByRoot = actionsByClip[ clipUuid ].actionByRoot,
					action = actionByRoot[ rootUuid ];

				if ( action !== undefined ) {

					this._deactivateAction( action );
					this._removeInactiveAction( action );

				}

			}

			var bindingsByRoot = this._bindingsByRootAndName,
				bindingByName = bindingsByRoot[ rootUuid ];

			if ( bindingByName !== undefined ) {

				for ( var trackName in bindingByName ) {

					var binding = bindingByName[ trackName ];
					binding.restoreOriginalState();
					this._removeInactiveBinding( binding );

				}

			}

		},

		// remove a targeted clip from the cache
		uncacheAction: function ( clip, optionalRoot ) {

			var action = this.existingAction( clip, optionalRoot );

			if ( action !== null ) {

				this._deactivateAction( action );
				this._removeInactiveAction( action );

			}

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function Uniform( value ) {

		if ( typeof value === 'string' ) {

			console.warn( 'THREE.Uniform: Type parameter is no longer needed.' );
			value = arguments[ 1 ];

		}

		this.value = value;

	}

	Uniform.prototype.clone = function () {

		return new Uniform( this.value.clone === undefined ? this.value : this.value.clone() );

	};

	/**
	 * @author benaadams / https://twitter.com/ben_a_adams
	 */

	function InstancedInterleavedBuffer( array, stride, meshPerAttribute ) {

		InterleavedBuffer.call( this, array, stride );

		this.meshPerAttribute = meshPerAttribute || 1;

	}

	InstancedInterleavedBuffer.prototype = Object.assign( Object.create( InterleavedBuffer.prototype ), {

		constructor: InstancedInterleavedBuffer,

		isInstancedInterleavedBuffer: true,

		copy: function ( source ) {

			InterleavedBuffer.prototype.copy.call( this, source );

			this.meshPerAttribute = source.meshPerAttribute;

			return this;

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author bhouston / http://clara.io/
	 * @author stephomi / http://stephaneginier.com/
	 */

	function Raycaster( origin, direction, near, far ) {

		this.ray = new Ray( origin, direction );
		// direction is assumed to be normalized (for accurate distance calculations)

		this.near = near || 0;
		this.far = far || Infinity;
		this.camera = null;
		this.layers = new Layers();

		this.params = {
			Mesh: {},
			Line: { threshold: 1 },
			LOD: {},
			Points: { threshold: 1 },
			Sprite: {}
		};

		Object.defineProperties( this.params, {
			PointCloud: {
				get: function () {

					console.warn( 'THREE.Raycaster: params.PointCloud has been renamed to params.Points.' );
					return this.Points;

				}
			}
		} );

	}

	function ascSort( a, b ) {

		return a.distance - b.distance;

	}

	function intersectObject( object, raycaster, intersects, recursive ) {

		if ( object.layers.test( raycaster.layers ) ) {

			object.raycast( raycaster, intersects );

		}

		if ( recursive === true ) {

			var children = object.children;

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

				intersectObject( children[ i ], raycaster, intersects, true );

			}

		}

	}

	Object.assign( Raycaster.prototype, {

		set: function ( origin, direction ) {

			// direction is assumed to be normalized (for accurate distance calculations)

			this.ray.set( origin, direction );

		},

		setFromCamera: function ( coords, camera ) {

			if ( ( camera && 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 && 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.' );

			}

		},

		intersectObject: function ( object, recursive, optionalTarget ) {

			var intersects = optionalTarget || [];

			intersectObject( object, this, intersects, recursive );

			intersects.sort( ascSort );

			return intersects;

		},

		intersectObjects: function ( objects, recursive, optionalTarget ) {

			var intersects = optionalTarget || [];

			if ( Array.isArray( objects ) === false ) {

				console.warn( 'THREE.Raycaster.intersectObjects: objects is not an Array.' );
				return intersects;

			}

			for ( var i = 0, l = objects.length; i < l; i ++ ) {

				intersectObject( objects[ i ], this, intersects, recursive );

			}

			intersects.sort( ascSort );

			return intersects;

		}

	} );

	/**
	 * @author bhouston / http://clara.io
	 * @author WestLangley / http://github.com/WestLangley
	 *
	 * Ref: https://en.wikipedia.org/wiki/Spherical_coordinate_system
	 *
	 * The polar angle (phi) is measured from the positive y-axis. The positive y-axis is up.
	 * The azimuthal angle (theta) is measured from the positive z-axis.
	 */

	function Spherical( radius, phi, theta ) {

		this.radius = ( radius !== undefined ) ? radius : 1.0;
		this.phi = ( phi !== undefined ) ? phi : 0; // polar angle
		this.theta = ( theta !== undefined ) ? theta : 0; // azimuthal angle

		return this;

	}

	Object.assign( Spherical.prototype, {

		set: function ( radius, phi, theta ) {

			this.radius = radius;
			this.phi = phi;
			this.theta = theta;

			return this;

		},

		clone: function () {

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

		},

		copy: function ( other ) {

			this.radius = other.radius;
			this.phi = other.phi;
			this.theta = other.theta;

			return this;

		},

		// restrict phi to be betwee EPS and PI-EPS
		makeSafe: function () {

			var EPS = 0.000001;
			this.phi = Math.max( EPS, Math.min( Math.PI - EPS, this.phi ) );

			return this;

		},

		setFromVector3: function ( v ) {

			return this.setFromCartesianCoords( v.x, v.y, v.z );

		},

		setFromCartesianCoords: function ( 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( MathUtils.clamp( y / this.radius, - 1, 1 ) );

			}

			return this;

		}

	} );

	/**
	 * @author Mugen87 / https://github.com/Mugen87
	 *
	 * Ref: https://en.wikipedia.org/wiki/Cylindrical_coordinate_system
	 *
	 */

	function Cylindrical( radius, theta, y ) {

		this.radius = ( radius !== undefined ) ? radius : 1.0; // distance from the origin to a point in the x-z plane
		this.theta = ( theta !== undefined ) ? theta : 0; // counterclockwise angle in the x-z plane measured in radians from the positive z-axis
		this.y = ( y !== undefined ) ? y : 0; // height above the x-z plane

		return this;

	}

	Object.assign( Cylindrical.prototype, {

		set: function ( radius, theta, y ) {

			this.radius = radius;
			this.theta = theta;
			this.y = y;

			return this;

		},

		clone: function () {

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

		},

		copy: function ( other ) {

			this.radius = other.radius;
			this.theta = other.theta;
			this.y = other.y;

			return this;

		},

		setFromVector3: function ( v ) {

			return this.setFromCartesianCoords( v.x, v.y, v.z );

		},

		setFromCartesianCoords: function ( x, y, z ) {

			this.radius = Math.sqrt( x * x + z * z );
			this.theta = Math.atan2( x, z );
			this.y = y;

			return this;

		}

	} );

	/**
	 * @author bhouston / http://clara.io
	 */

	var _vector$7 = new Vector2();

	function Box2( min, max ) {

		this.min = ( min !== undefined ) ? min : new Vector2( + Infinity, + Infinity );
		this.max = ( max !== undefined ) ? max : new Vector2( - Infinity, - Infinity );

	}

	Object.assign( Box2.prototype, {

		set: function ( min, max ) {

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

			return this;

		},

		setFromPoints: function ( points ) {

			this.makeEmpty();

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

				this.expandByPoint( points[ i ] );

			}

			return this;

		},

		setFromCenterAndSize: function ( center, size ) {

			var halfSize = _vector$7.copy( size ).multiplyScalar( 0.5 );
			this.min.copy( center ).sub( halfSize );
			this.max.copy( center ).add( halfSize );

			return this;

		},

		clone: function () {

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

		},

		copy: function ( box ) {

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

			return this;

		},

		makeEmpty: function () {

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

			return this;

		},

		isEmpty: function () {

			// 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: function ( target ) {

			if ( target === undefined ) {

				console.warn( 'THREE.Box2: .getCenter() target is now required' );
				target = new Vector2();

			}

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

		},

		getSize: function ( target ) {

			if ( target === undefined ) {

				console.warn( 'THREE.Box2: .getSize() target is now required' );
				target = new Vector2();

			}

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

		},

		expandByPoint: function ( point ) {

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

			return this;

		},

		expandByVector: function ( vector ) {

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

			return this;

		},

		expandByScalar: function ( scalar ) {

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

			return this;

		},

		containsPoint: function ( 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: function ( 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: function ( point, target ) {

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

			if ( target === undefined ) {

				console.warn( 'THREE.Box2: .getParameter() target is now required' );
				target = new Vector2();

			}

			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: function ( 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: function ( point, target ) {

			if ( target === undefined ) {

				console.warn( 'THREE.Box2: .clampPoint() target is now required' );
				target = new Vector2();

			}

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

		},

		distanceToPoint: function ( point ) {

			var clampedPoint = _vector$7.copy( point ).clamp( this.min, this.max );
			return clampedPoint.sub( point ).length();

		},

		intersect: function ( box ) {

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

			return this;

		},

		union: function ( box ) {

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

			return this;

		},

		translate: function ( offset ) {

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

			return this;

		},

		equals: function ( box ) {

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

		}

	} );

	/**
	 * @author bhouston / http://clara.io
	 */

	var _startP = new Vector3();
	var _startEnd = new Vector3();

	function Line3( start, end ) {

		this.start = ( start !== undefined ) ? start : new Vector3();
		this.end = ( end !== undefined ) ? end : new Vector3();

	}

	Object.assign( Line3.prototype, {

		set: function ( start, end ) {

			this.start.copy( start );
			this.end.copy( end );

			return this;

		},

		clone: function () {

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

		},

		copy: function ( line ) {

			this.start.copy( line.start );
			this.end.copy( line.end );

			return this;

		},

		getCenter: function ( target ) {

			if ( target === undefined ) {

				console.warn( 'THREE.Line3: .getCenter() target is now required' );
				target = new Vector3();

			}

			return target.addVectors( this.start, this.end ).multiplyScalar( 0.5 );

		},

		delta: function ( target ) {

			if ( target === undefined ) {

				console.warn( 'THREE.Line3: .delta() target is now required' );
				target = new Vector3();

			}

			return target.subVectors( this.end, this.start );

		},

		distanceSq: function () {

			return this.start.distanceToSquared( this.end );

		},

		distance: function () {

			return this.start.distanceTo( this.end );

		},

		at: function ( t, target ) {

			if ( target === undefined ) {

				console.warn( 'THREE.Line3: .at() target is now required' );
				target = new Vector3();

			}

			return this.delta( target ).multiplyScalar( t ).add( this.start );

		},

		closestPointToPointParameter: function ( point, clampToLine ) {

			_startP.subVectors( point, this.start );
			_startEnd.subVectors( this.end, this.start );

			var startEnd2 = _startEnd.dot( _startEnd );
			var startEnd_startP = _startEnd.dot( _startP );

			var t = startEnd_startP / startEnd2;

			if ( clampToLine ) {

				t = MathUtils.clamp( t, 0, 1 );

			}

			return t;

		},

		closestPointToPoint: function ( point, clampToLine, target ) {

			var t = this.closestPointToPointParameter( point, clampToLine );

			if ( target === undefined ) {

				console.warn( 'THREE.Line3: .closestPointToPoint() target is now required' );
				target = new Vector3();

			}

			return this.delta( target ).multiplyScalar( t ).add( this.start );

		},

		applyMatrix4: function ( matrix ) {

			this.start.applyMatrix4( matrix );
			this.end.applyMatrix4( matrix );

			return this;

		},

		equals: function ( line ) {

			return line.start.equals( this.start ) && line.end.equals( this.end );

		}

	} );

	/**
	 * @author alteredq / http://alteredqualia.com/
	 */

	function ImmediateRenderObject( material ) {

		Object3D.call( this );

		this.material = material;
		this.render = function ( /* renderCallback */ ) {};

	}

	ImmediateRenderObject.prototype = Object.create( Object3D.prototype );
	ImmediateRenderObject.prototype.constructor = ImmediateRenderObject;

	ImmediateRenderObject.prototype.isImmediateRenderObject = true;

	/**
	 * @author alteredq / http://alteredqualia.com/
	 * @author mrdoob / http://mrdoob.com/
	 * @author WestLangley / http://github.com/WestLangley
	 */

	var _vector$8 = new Vector3();

	function SpotLightHelper( light, color ) {

		Object3D.call( this );

		this.light = light;
		this.light.updateMatrixWorld();

		this.matrix = light.matrixWorld;
		this.matrixAutoUpdate = false;

		this.color = color;

		var geometry = new BufferGeometry();

		var 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 ( var i = 0, j = 1, l = 32; i < l; i ++, j ++ ) {

			var p1 = ( i / l ) * Math.PI * 2;
			var 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 ) );

		var material = new LineBasicMaterial( { fog: false } );

		this.cone = new LineSegments( geometry, material );
		this.add( this.cone );

		this.update();

	}

	SpotLightHelper.prototype = Object.create( Object3D.prototype );
	SpotLightHelper.prototype.constructor = SpotLightHelper;

	SpotLightHelper.prototype.dispose = function () {

		this.cone.geometry.dispose();
		this.cone.material.dispose();

	};

	SpotLightHelper.prototype.update = function () {

		this.light.updateMatrixWorld();

		var coneLength = this.light.distance ? this.light.distance : 1000;
		var coneWidth = coneLength * Math.tan( this.light.angle );

		this.cone.scale.set( coneWidth, coneWidth, coneLength );

		_vector$8.setFromMatrixPosition( this.light.target.matrixWorld );

		this.cone.lookAt( _vector$8 );

		if ( this.color !== undefined ) {

			this.cone.material.color.set( this.color );

		} else {

			this.cone.material.color.copy( this.light.color );

		}

	};

	/**
	 * @author Sean Griffin / http://twitter.com/sgrif
	 * @author Michael Guerrero / http://realitymeltdown.com
	 * @author mrdoob / http://mrdoob.com/
	 * @author ikerr / http://verold.com
	 * @author Mugen87 / https://github.com/Mugen87
	 */

	var _vector$9 = new Vector3();
	var _boneMatrix = new Matrix4();
	var _matrixWorldInv = new Matrix4();

	function getBoneList( object ) {

		var boneList = [];

		if ( object && object.isBone ) {

			boneList.push( object );

		}

		for ( var i = 0; i < object.children.length; i ++ ) {

			boneList.push.apply( boneList, getBoneList( object.children[ i ] ) );

		}

		return boneList;

	}

	function SkeletonHelper( object ) {

		var bones = getBoneList( object );

		var geometry = new BufferGeometry();

		var vertices = [];
		var colors = [];

		var color1 = new Color( 0, 0, 1 );
		var color2 = new Color( 0, 1, 0 );

		for ( var i = 0; i < bones.length; i ++ ) {

			var 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 ) );

		var material = new LineBasicMaterial( { vertexColors: true, depthTest: false, depthWrite: false, transparent: true } );

		LineSegments.call( this, geometry, material );

		this.root = object;
		this.bones = bones;

		this.matrix = object.matrixWorld;
		this.matrixAutoUpdate = false;

	}

	SkeletonHelper.prototype = Object.create( LineSegments.prototype );
	SkeletonHelper.prototype.constructor = SkeletonHelper;

	SkeletonHelper.prototype.isSkeletonHelper = true;

	SkeletonHelper.prototype.updateMatrixWorld = function ( force ) {

		var bones = this.bones;

		var geometry = this.geometry;
		var position = geometry.getAttribute( 'position' );

		_matrixWorldInv.getInverse( this.root.matrixWorld );

		for ( var i = 0, j = 0; i < bones.length; i ++ ) {

			var bone = bones[ i ];

			if ( bone.parent && bone.parent.isBone ) {

				_boneMatrix.multiplyMatrices( _matrixWorldInv, bone.matrixWorld );
				_vector$9.setFromMatrixPosition( _boneMatrix );
				position.setXYZ( j, _vector$9.x, _vector$9.y, _vector$9.z );

				_boneMatrix.multiplyMatrices( _matrixWorldInv, bone.parent.matrixWorld );
				_vector$9.setFromMatrixPosition( _boneMatrix );
				position.setXYZ( j + 1, _vector$9.x, _vector$9.y, _vector$9.z );

				j += 2;

			}

		}

		geometry.getAttribute( 'position' ).needsUpdate = true;

		Object3D.prototype.updateMatrixWorld.call( this, force );

	};

	/**
	 * @author alteredq / http://alteredqualia.com/
	 * @author mrdoob / http://mrdoob.com/
	 */

	function PointLightHelper( light, sphereSize, color ) {

		this.light = light;
		this.light.updateMatrixWorld();

		this.color = color;

		var geometry = new SphereBufferGeometry( sphereSize, 4, 2 );
		var material = new MeshBasicMaterial( { wireframe: true, fog: false } );

		Mesh.call( this, geometry, material );

		this.matrix = this.light.matrixWorld;
		this.matrixAutoUpdate = false;

		this.update();


		/*
		var distanceGeometry = new THREE.IcosahedronBufferGeometry( 1, 2 );
		var 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 );

		var d = light.distance;

		if ( d === 0.0 ) {

			this.lightDistance.visible = false;

		} else {

			this.lightDistance.scale.set( d, d, d );

		}

		this.add( this.lightDistance );
		*/

	}

	PointLightHelper.prototype = Object.create( Mesh.prototype );
	PointLightHelper.prototype.constructor = PointLightHelper;

	PointLightHelper.prototype.dispose = function () {

		this.geometry.dispose();
		this.material.dispose();

	};

	PointLightHelper.prototype.update = function () {

		if ( this.color !== undefined ) {

			this.material.color.set( this.color );

		} else {

			this.material.color.copy( this.light.color );

		}

		/*
		var d = this.light.distance;

		if ( d === 0.0 ) {

			this.lightDistance.visible = false;

		} else {

			this.lightDistance.visible = true;
			this.lightDistance.scale.set( d, d, d );

		}
		*/

	};

	/**
	 * @author alteredq / http://alteredqualia.com/
	 * @author mrdoob / http://mrdoob.com/
	 * @author Mugen87 / https://github.com/Mugen87
	 */

	var _vector$a = new Vector3();
	var _color1 = new Color();
	var _color2 = new Color();

	function HemisphereLightHelper( light, size, color ) {

		Object3D.call( this );

		this.light = light;
		this.light.updateMatrixWorld();

		this.matrix = light.matrixWorld;
		this.matrixAutoUpdate = false;

		this.color = color;

		var geometry = new OctahedronBufferGeometry( size );
		geometry.rotateY( Math.PI * 0.5 );

		this.material = new MeshBasicMaterial( { wireframe: true, fog: false } );
		if ( this.color === undefined ) { this.material.vertexColors = true; }

		var position = geometry.getAttribute( 'position' );
		var colors = new Float32Array( position.count * 3 );

		geometry.setAttribute( 'color', new BufferAttribute( colors, 3 ) );

		this.add( new Mesh( geometry, this.material ) );

		this.update();

	}

	HemisphereLightHelper.prototype = Object.create( Object3D.prototype );
	HemisphereLightHelper.prototype.constructor = HemisphereLightHelper;

	HemisphereLightHelper.prototype.dispose = function () {

		this.children[ 0 ].geometry.dispose();
		this.children[ 0 ].material.dispose();

	};

	HemisphereLightHelper.prototype.update = function () {

		var mesh = this.children[ 0 ];

		if ( this.color !== undefined ) {

			this.material.color.set( this.color );

		} else {

			var colors = mesh.geometry.getAttribute( 'color' );

			_color1.copy( this.light.color );
			_color2.copy( this.light.groundColor );

			for ( var i = 0, l = colors.count; i < l; i ++ ) {

				var color = ( i < ( l / 2 ) ) ? _color1 : _color2;

				colors.setXYZ( i, color.r, color.g, color.b );

			}

			colors.needsUpdate = true;

		}

		mesh.lookAt( _vector$a.setFromMatrixPosition( this.light.matrixWorld ).negate() );

	};

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function GridHelper( size, divisions, color1, color2 ) {

		size = size || 10;
		divisions = divisions || 10;
		color1 = new Color( color1 !== undefined ? color1 : 0x444444 );
		color2 = new Color( color2 !== undefined ? color2 : 0x888888 );

		var center = divisions / 2;
		var step = size / divisions;
		var halfSize = size / 2;

		var vertices = [], colors = [];

		for ( var 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 );

			var 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;

		}

		var geometry = new BufferGeometry();
		geometry.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
		geometry.setAttribute( 'color', new Float32BufferAttribute( colors, 3 ) );

		var material = new LineBasicMaterial( { vertexColors: true } );

		LineSegments.call( this, geometry, material );

	}

	GridHelper.prototype = Object.assign( Object.create( LineSegments.prototype ), {

		constructor: GridHelper,

		copy: function ( source ) {

			LineSegments.prototype.copy.call( this, source );

			this.geometry.copy( source.geometry );
			this.material.copy( source.material );

			return this;

		},

		clone: function () {

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

		}

	} );

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author Mugen87 / http://github.com/Mugen87
	 * @author Hectate / http://www.github.com/Hectate
	 */

	function PolarGridHelper( radius, radials, circles, divisions, color1, color2 ) {

		radius = radius || 10;
		radials = radials || 16;
		circles = circles || 8;
		divisions = divisions || 64;
		color1 = new Color( color1 !== undefined ? color1 : 0x444444 );
		color2 = new Color( color2 !== undefined ? color2 : 0x888888 );

		var vertices = [];
		var colors = [];

		var x, z;
		var v, i, j, r, color;

		// create the radials

		for ( i = 0; i <= radials; i ++ ) {

			v = ( i / radials ) * ( Math.PI * 2 );

			x = Math.sin( v ) * radius;
			z = Math.cos( v ) * radius;

			vertices.push( 0, 0, 0 );
			vertices.push( x, 0, z );

			color = ( i & 1 ) ? color1 : color2;

			colors.push( color.r, color.g, color.b );
			colors.push( color.r, color.g, color.b );

		}

		// create the circles

		for ( i = 0; i <= circles; i ++ ) {

			color = ( i & 1 ) ? color1 : color2;

			r = radius - ( radius / circles * i );

			for ( j = 0; j < divisions; j ++ ) {

				// first vertex

				v = ( j / 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 );

				// 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 );

			}

		}

		var geometry = new BufferGeometry();
		geometry.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
		geometry.setAttribute( 'color', new Float32BufferAttribute( colors, 3 ) );

		var material = new LineBasicMaterial( { vertexColors: true } );

		LineSegments.call( this, geometry, material );

	}

	PolarGridHelper.prototype = Object.create( LineSegments.prototype );
	PolarGridHelper.prototype.constructor = PolarGridHelper;

	/**
	 * @author alteredq / http://alteredqualia.com/
	 * @author mrdoob / http://mrdoob.com/
	 * @author WestLangley / http://github.com/WestLangley
	 */

	var _v1$5 = new Vector3();
	var _v2$3 = new Vector3();
	var _v3$1 = new Vector3();

	function DirectionalLightHelper( light, size, color ) {

		Object3D.call( this );

		this.light = light;
		this.light.updateMatrixWorld();

		this.matrix = light.matrixWorld;
		this.matrixAutoUpdate = false;

		this.color = color;

		if ( size === undefined ) { size = 1; }

		var geometry = new BufferGeometry();
		geometry.setAttribute( 'position', new Float32BufferAttribute( [
			- size, size, 0,
			size, size, 0,
			size, - size, 0,
			- size, - size, 0,
			- size, size, 0
		], 3 ) );

		var material = new LineBasicMaterial( { fog: 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();

	}

	DirectionalLightHelper.prototype = Object.create( Object3D.prototype );
	DirectionalLightHelper.prototype.constructor = DirectionalLightHelper;

	DirectionalLightHelper.prototype.dispose = function () {

		this.lightPlane.geometry.dispose();
		this.lightPlane.material.dispose();
		this.targetLine.geometry.dispose();
		this.targetLine.material.dispose();

	};

	DirectionalLightHelper.prototype.update = function () {

		_v1$5.setFromMatrixPosition( this.light.matrixWorld );
		_v2$3.setFromMatrixPosition( this.light.target.matrixWorld );
		_v3$1.subVectors( _v2$3, _v1$5 );

		this.lightPlane.lookAt( _v2$3 );

		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$3 );
		this.targetLine.scale.z = _v3$1.length();

	};

	/**
	 * @author alteredq / http://alteredqualia.com/
	 * @author Mugen87 / https://github.com/Mugen87
	 *
	 *	- shows frustum, line of sight and up of the camera
	 *	- suitable for fast updates
	 * 	- based on frustum visualization in lightgl.js shadowmap example
	 *		http://evanw.github.com/lightgl.js/tests/shadowmap.html
	 */

	var _vector$b = new Vector3();
	var _camera = new Camera();

	function CameraHelper( camera ) {

		var geometry = new BufferGeometry();
		var material = new LineBasicMaterial( { color: 0xffffff, vertexColors: true } );

		var vertices = [];
		var colors = [];

		var pointMap = {};

		// colors

		var colorFrustum = new Color( 0xffaa00 );
		var colorCone = new Color( 0xff0000 );
		var colorUp = new Color( 0x00aaff );
		var colorTarget = new Color( 0xffffff );
		var colorCross = new Color( 0x333333 );

		// near

		addLine( 'n1', 'n2', colorFrustum );
		addLine( 'n2', 'n4', colorFrustum );
		addLine( 'n4', 'n3', colorFrustum );
		addLine( 'n3', 'n1', colorFrustum );

		// far

		addLine( 'f1', 'f2', colorFrustum );
		addLine( 'f2', 'f4', colorFrustum );
		addLine( 'f4', 'f3', colorFrustum );
		addLine( 'f3', 'f1', colorFrustum );

		// sides

		addLine( 'n1', 'f1', colorFrustum );
		addLine( 'n2', 'f2', colorFrustum );
		addLine( 'n3', 'f3', colorFrustum );
		addLine( 'n4', 'f4', colorFrustum );

		// cone

		addLine( 'p', 'n1', colorCone );
		addLine( 'p', 'n2', colorCone );
		addLine( 'p', 'n3', colorCone );
		addLine( 'p', 'n4', colorCone );

		// up

		addLine( 'u1', 'u2', colorUp );
		addLine( 'u2', 'u3', colorUp );
		addLine( 'u3', 'u1', colorUp );

		// target

		addLine( 'c', 't', colorTarget );
		addLine( 'p', 'c', colorCross );

		// cross

		addLine( 'cn1', 'cn2', colorCross );
		addLine( 'cn3', 'cn4', colorCross );

		addLine( 'cf1', 'cf2', colorCross );
		addLine( 'cf3', 'cf4', colorCross );

		function addLine( a, b, color ) {

			addPoint( a, color );
			addPoint( b, color );

		}

		function addPoint( id, color ) {

			vertices.push( 0, 0, 0 );
			colors.push( color.r, color.g, color.b );

			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 ) );

		LineSegments.call( this, geometry, material );

		this.camera = camera;
		if ( this.camera.updateProjectionMatrix ) { this.camera.updateProjectionMatrix(); }

		this.matrix = camera.matrixWorld;
		this.matrixAutoUpdate = false;

		this.pointMap = pointMap;

		this.update();

	}

	CameraHelper.prototype = Object.create( LineSegments.prototype );
	CameraHelper.prototype.constructor = CameraHelper;

	CameraHelper.prototype.update = function () {

		var geometry = this.geometry;
		var pointMap = this.pointMap;

		var w = 1, h = 1;

		// we need just camera projection matrix inverse
		// world matrix must be identity

		_camera.projectionMatrixInverse.copy( this.camera.projectionMatrixInverse );

		// center / target

		setPoint( 'c', pointMap, geometry, _camera, 0, 0, - 1 );
		setPoint( 't', pointMap, geometry, _camera, 0, 0, 1 );

		// near

		setPoint( 'n1', pointMap, geometry, _camera, - w, - h, - 1 );
		setPoint( 'n2', pointMap, geometry, _camera, w, - h, - 1 );
		setPoint( 'n3', pointMap, geometry, _camera, - w, h, - 1 );
		setPoint( 'n4', pointMap, geometry, _camera, w, h, - 1 );

		// far

		setPoint( 'f1', pointMap, geometry, _camera, - w, - h, 1 );
		setPoint( 'f2', pointMap, geometry, _camera, w, - h, 1 );
		setPoint( 'f3', pointMap, geometry, _camera, - w, h, 1 );
		setPoint( 'f4', pointMap, geometry, _camera, w, h, 1 );

		// up

		setPoint( 'u1', pointMap, geometry, _camera, w * 0.7, h * 1.1, - 1 );
		setPoint( 'u2', pointMap, geometry, _camera, - w * 0.7, h * 1.1, - 1 );
		setPoint( 'u3', pointMap, geometry, _camera, 0, h * 2, - 1 );

		// cross

		setPoint( 'cf1', pointMap, geometry, _camera, - w, 0, 1 );
		setPoint( 'cf2', pointMap, geometry, _camera, w, 0, 1 );
		setPoint( 'cf3', pointMap, geometry, _camera, 0, - h, 1 );
		setPoint( 'cf4', pointMap, geometry, _camera, 0, h, 1 );

		setPoint( 'cn1', pointMap, geometry, _camera, - w, 0, - 1 );
		setPoint( 'cn2', pointMap, geometry, _camera, w, 0, - 1 );
		setPoint( 'cn3', pointMap, geometry, _camera, 0, - h, - 1 );
		setPoint( 'cn4', pointMap, geometry, _camera, 0, h, - 1 );

		geometry.getAttribute( 'position' ).needsUpdate = true;

	};

	function setPoint( point, pointMap, geometry, camera, x, y, z ) {

		_vector$b.set( x, y, z ).unproject( camera );

		var points = pointMap[ point ];

		if ( points !== undefined ) {

			var position = geometry.getAttribute( 'position' );

			for ( var i = 0, l = points.length; i < l; i ++ ) {

				position.setXYZ( points[ i ], _vector$b.x, _vector$b.y, _vector$b.z );

			}

		}

	}

	/**
	 * @author mrdoob / http://mrdoob.com/
	 * @author Mugen87 / http://github.com/Mugen87
	 */

	var _box$3 = new Box3();

	function BoxHelper( object, color ) {

		this.object = object;

		if ( color === undefined ) { color = 0xffff00; }

		var 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 ] );
		var positions = new Float32Array( 8 * 3 );

		var geometry = new BufferGeometry();
		geometry.setIndex( new BufferAttribute( indices, 1 ) );
		geometry.setAttribute( 'position', new BufferAttribute( positions, 3 ) );

		LineSegments.call( this, geometry, new LineBasicMaterial( { color: color } ) );

		this.matrixAutoUpdate = false;

		this.update();

	}

	BoxHelper.prototype = Object.create( LineSegments.prototype );
	BoxHelper.prototype.constructor = BoxHelper;

	BoxHelper.prototype.update = function ( object ) {

		if ( object !== undefined ) {

			console.warn( 'THREE.BoxHelper: .update() has no longer arguments.' );

		}

		if ( this.object !== undefined ) {

			_box$3.setFromObject( this.object );

		}

		if ( _box$3.isEmpty() ) { return; }

		var min = _box$3.min;
		var max = _box$3.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
		*/

		var position = this.geometry.attributes.position;
		var 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();


	};

	BoxHelper.prototype.setFromObject = function ( object ) {

		this.object = object;
		this.update();

		return this;

	};

	BoxHelper.prototype.copy = function ( source ) {

		LineSegments.prototype.copy.call( this, source );

		this.object = source.object;

		return this;

	};

	BoxHelper.prototype.clone = function () {

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

	};

	/**
	 * @author WestLangley / http://github.com/WestLangley
	 */

	function Box3Helper( box, color ) {

		this.type = 'Box3Helper';

		this.box = box;

		color = color || 0xffff00;

		var 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 ] );

		var 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 ];

		var geometry = new BufferGeometry();

		geometry.setIndex( new BufferAttribute( indices, 1 ) );

		geometry.setAttribute( 'position', new Float32BufferAttribute( positions, 3 ) );

		LineSegments.call( this, geometry, new LineBasicMaterial( { color: color } ) );

		this.geometry.computeBoundingSphere();

	}

	Box3Helper.prototype = Object.create( LineSegments.prototype );
	Box3Helper.prototype.constructor = Box3Helper;

	Box3Helper.prototype.updateMatrixWorld = function ( force ) {

		var box = this.box;

		if ( box.isEmpty() ) { return; }

		box.getCenter( this.position );

		box.getSize( this.scale );

		this.scale.multiplyScalar( 0.5 );

		Object3D.prototype.updateMatrixWorld.call( this, force );

	};

	/**
	 * @author WestLangley / http://github.com/WestLangley
	 */

	function PlaneHelper( plane, size, hex ) {

		this.type = 'PlaneHelper';

		this.plane = plane;

		this.size = ( size === undefined ) ? 1 : size;

		var color = ( hex !== undefined ) ? hex : 0xffff00;

		var 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, 0, 0, 1, 0, 0, 0 ];

		var geometry = new BufferGeometry();
		geometry.setAttribute( 'position', new Float32BufferAttribute( positions, 3 ) );
		geometry.computeBoundingSphere();

		Line.call( this, geometry, new LineBasicMaterial( { color: color } ) );

		//

		var positions2 = [ 1, 1, 1, - 1, 1, 1, - 1, - 1, 1, 1, 1, 1, - 1, - 1, 1, 1, - 1, 1 ];

		var 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 } ) ) );

	}

	PlaneHelper.prototype = Object.create( Line.prototype );
	PlaneHelper.prototype.constructor = PlaneHelper;

	PlaneHelper.prototype.updateMatrixWorld = function ( force ) {

		var scale = - this.plane.constant;

		if ( Math.abs( scale ) < 1e-8 ) { scale = 1e-8; } // sign does not matter

		this.scale.set( 0.5 * this.size, 0.5 * this.size, scale );

		this.children[ 0 ].material.side = ( scale < 0 ) ? BackSide : FrontSide; // renderer flips side when determinant < 0; flipping not wanted here

		this.lookAt( this.plane.normal );

		Object3D.prototype.updateMatrixWorld.call( this, force );

	};

	/**
	 * @author WestLangley / http://github.com/WestLangley
	 * @author zz85 / http://github.com/zz85
	 * @author bhouston / http://clara.io
	 *
	 * Creates an arrow for visualizing directions
	 *
	 * Parameters:
	 *  dir - Vector3
	 *  origin - Vector3
	 *  length - Number
	 *  color - color in hex value
	 *  headLength - Number
	 *  headWidth - Number
	 */

	var _axis = new Vector3();
	var _lineGeometry, _coneGeometry;

	function ArrowHelper( dir, origin, length, color, headLength, headWidth ) {

		// dir is assumed to be normalized

		Object3D.call( this );

		if ( dir === undefined ) { dir = new Vector3( 0, 0, 1 ); }
		if ( origin === undefined ) { origin = new Vector3( 0, 0, 0 ); }
		if ( length === undefined ) { length = 1; }
		if ( color === undefined ) { color = 0xffff00; }
		if ( headLength === undefined ) { headLength = 0.2 * length; }
		if ( headWidth === undefined ) { headWidth = 0.2 * headLength; }

		if ( _lineGeometry === undefined ) {

			_lineGeometry = new BufferGeometry();
			_lineGeometry.setAttribute( 'position', new Float32BufferAttribute( [ 0, 0, 0, 0, 1, 0 ], 3 ) );

			_coneGeometry = new CylinderBufferGeometry( 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 } ) );
		this.line.matrixAutoUpdate = false;
		this.add( this.line );

		this.cone = new Mesh( _coneGeometry, new MeshBasicMaterial( { color: color } ) );
		this.cone.matrixAutoUpdate = false;
		this.add( this.cone );

		this.setDirection( dir );
		this.setLength( length, headLength, headWidth );

	}

	ArrowHelper.prototype = Object.create( Object3D.prototype );
	ArrowHelper.prototype.constructor = ArrowHelper;

	ArrowHelper.prototype.setDirection = function ( 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();

			var radians = Math.acos( dir.y );

			this.quaternion.setFromAxisAngle( _axis, radians );

		}

	};

	ArrowHelper.prototype.setLength = function ( length, headLength, headWidth ) {

		if ( headLength === undefined ) { headLength = 0.2 * length; }
		if ( headWidth === undefined ) { headWidth = 0.2 * headLength; }

		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();

	};

	ArrowHelper.prototype.setColor = function ( color ) {

		this.line.material.color.set( color );
		this.cone.material.color.set( color );

	};

	ArrowHelper.prototype.copy = function ( source ) {

		Object3D.prototype.copy.call( this, source, false );

		this.line.copy( source.line );
		this.cone.copy( source.cone );

		return this;

	};

	ArrowHelper.prototype.clone = function () {

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

	};

	/**
	 * @author sroucheray / http://sroucheray.org/
	 * @author mrdoob / http://mrdoob.com/
	 */

	function AxesHelper( size ) {

		size = size || 1;

		var vertices = [
			0, 0, 0,	size, 0, 0,
			0, 0, 0,	0, size, 0,
			0, 0, 0,	0, 0, size
		];

		var colors = [
			1, 0, 0,	1, 0.6, 0,
			0, 1, 0,	0.6, 1, 0,
			0, 0, 1,	0, 0.6, 1
		];

		var geometry = new BufferGeometry();
		geometry.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
		geometry.setAttribute( 'color', new Float32BufferAttribute( colors, 3 ) );

		var material = new LineBasicMaterial( { vertexColors: true } );

		LineSegments.call( this, geometry, material );

	}

	AxesHelper.prototype = Object.create( LineSegments.prototype );
	AxesHelper.prototype.constructor = AxesHelper;

	/**
	 * @author Emmett Lalish / elalish
	 *
	 * 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.
	 */

	var LOD_MIN = 4;
	var LOD_MAX = 8;
	var SIZE_MAX = Math.pow( 2, LOD_MAX );
	// 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.
	var EXTRA_LOD_SIGMA = [ 0.125, 0.215, 0.35, 0.446, 0.526, 0.582 ];
	var TOTAL_LODS = LOD_MAX - LOD_MIN + 1 + EXTRA_LOD_SIGMA.length;
	// The maximum length of the blur for loop. Smaller sigmas will use fewer
	// samples and exit early, but not recompile the shader.
	var MAX_SAMPLES = 20;
	var ENCODINGS = {};
	ENCODINGS[ LinearEncoding ] = 0;
	ENCODINGS[ sRGBEncoding ] = 1;
	ENCODINGS[ RGBEEncoding ] = 2;
	ENCODINGS[ RGBM7Encoding ] = 3;
	ENCODINGS[ RGBM16Encoding ] = 4;
	ENCODINGS[ RGBDEncoding ] = 5;
	ENCODINGS[ GammaEncoding ] = 6;

	var _flatCamera = new OrthographicCamera();
	var _blurMaterial = _getBlurShader( MAX_SAMPLES );
	var _equirectShader = null;
	var _cubemapShader = null;

	var ref = _createPlanes();
	var _lodPlanes = ref._lodPlanes;
	var _sizeLods = ref._sizeLods;
	var _sigmas = ref._sigmas;
	var _pingPongRenderTarget = null;
	var _renderer = null;

	var _oldTarget = null;

	// Golden Ratio
	var PHI = ( 1 + Math.sqrt( 5 ) ) / 2;
	var 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.
	var _axisDirections = [
		new Vector3( 1, 1, 1 ),
		new Vector3( - 1, 1, 1 ),
		new Vector3( 1, 1, - 1 ),
		new Vector3( - 1, 1, - 1 ),
		new Vector3( 0, PHI, INV_PHI ),
		new Vector3( 0, PHI, - INV_PHI ),
		new Vector3( INV_PHI, 0, PHI ),
		new Vector3( - INV_PHI, 0, PHI ),
		new Vector3( PHI, INV_PHI, 0 ),
		new Vector3( - PHI, INV_PHI, 0 ) ];

	function PMREMGenerator( renderer ) {

		_renderer = renderer;
		_compileMaterial( _blurMaterial );

	}

	PMREMGenerator.prototype = {

		constructor: PMREMGenerator,

		/**
		 * 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: function ( scene, sigma, near, far ) {
			if ( sigma === void 0 ) sigma = 0;
			if ( near === void 0 ) near = 0.1;
			if ( far === void 0 ) far = 100;


			_oldTarget = _renderer.getRenderTarget();
			var cubeUVRenderTarget = _allocateTargets();
			_sceneToCubeUV( scene, near, far, cubeUVRenderTarget );
			if ( sigma > 0 ) {

				_blur( cubeUVRenderTarget, 0, 0, sigma );

			}
			_applyPMREM( cubeUVRenderTarget );
			_cleanup( cubeUVRenderTarget );

			return cubeUVRenderTarget;

		},

		/**
		 * Generates a PMREM from an equirectangular texture, which can be either LDR
		 * (RGBFormat) or HDR (RGBEFormat). The ideal input image size is 1k (1024 x 512),
		 * as this matches best with the 256 x 256 cubemap output.
		 */
		fromEquirectangular: function ( equirectangular ) {

			equirectangular.magFilter = NearestFilter;
			equirectangular.minFilter = NearestFilter;
			equirectangular.generateMipmaps = false;

			return this.fromCubemap( equirectangular );

		},

		/**
		 * Generates a PMREM from an cubemap texture, which can be either LDR
		 * (RGBFormat) or HDR (RGBEFormat). The ideal input cube size is 256 x 256,
		 * as this matches best with the 256 x 256 cubemap output.
		 */
		fromCubemap: function ( cubemap ) {

			_oldTarget = _renderer.getRenderTarget();
			var cubeUVRenderTarget = _allocateTargets( cubemap );
			_textureToCubeUV( cubemap, cubeUVRenderTarget );
			_applyPMREM( cubeUVRenderTarget );
			_cleanup( cubeUVRenderTarget );

			return cubeUVRenderTarget;

		},

		/**
		 * 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: function () {

			if ( _cubemapShader == null ) {

				_cubemapShader = _getCubemapShader();
				_compileMaterial( _cubemapShader );

			}

		},

		/**
		 * 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: function () {

			if ( _equirectShader == null ) {

				_equirectShader = _getEquirectShader();
				_compileMaterial( _equirectShader );

			}

		},

		/**
		 * 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: function () {

			_blurMaterial.dispose();

			if ( _cubemapShader != null ) { _cubemapShader.dispose(); }
			if ( _equirectShader != null ) { _equirectShader.dispose(); }

			for ( var i = 0; i < _lodPlanes.length; i ++ ) {

				_lodPlanes[ i ].dispose();

			}

		},

	};

	function _createPlanes() {

		var _lodPlanes = [];
		var _sizeLods = [];
		var _sigmas = [];

		var lod = LOD_MAX;
		for ( var i = 0; i < TOTAL_LODS; i ++ ) {

			var sizeLod = Math.pow( 2, lod );
			_sizeLods.push( sizeLod );
			var sigma = 1.0 / sizeLod;
			if ( i > LOD_MAX - LOD_MIN ) {

				sigma = EXTRA_LOD_SIGMA[ i - LOD_MAX + LOD_MIN - 1 ];

			} else if ( i == 0 ) {

				sigma = 0;

			}
			_sigmas.push( sigma );

			var texelSize = 1.0 / ( sizeLod - 1 );
			var min = - texelSize / 2;
			var max = 1 + texelSize / 2;
			var uv1 = [ min, min, max, min, max, max, min, min, max, max, min, max ];

			var cubeFaces = 6;
			var vertices = 6;
			var positionSize = 3;
			var uvSize = 2;
			var faceIndexSize = 1;

			var position = new Float32Array( positionSize * vertices * cubeFaces );
			var uv = new Float32Array( uvSize * vertices * cubeFaces );
			var faceIndex = new Float32Array( faceIndexSize * vertices * cubeFaces );

			for ( var face = 0; face < cubeFaces; face ++ ) {

				var x = ( face % 3 ) * 2 / 3 - 1;
				var y = face > 2 ? 0 : - 1;
				var 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
				];
				position.set( coordinates, positionSize * vertices * face );
				uv.set( uv1, uvSize * vertices * face );
				var fill = [ face, face, face, face, face, face ];
				faceIndex.set( fill, faceIndexSize * vertices * face );

			}
			var 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 );

			if ( lod > LOD_MIN ) {

				lod --;

			}

		}
		return { _lodPlanes: _lodPlanes, _sizeLods: _sizeLods, _sigmas: _sigmas };

	}

	function _allocateTargets( equirectangular ) {

		var params = {
			magFilter: NearestFilter,
			minFilter: NearestFilter,
			generateMipmaps: false,
			type: equirectangular ? equirectangular.type : UnsignedByteType,
			format: equirectangular ? equirectangular.format : RGBEFormat,
			encoding: equirectangular ? equirectangular.encoding : RGBEEncoding,
			depthBuffer: false,
			stencilBuffer: false
		};
		var cubeUVRenderTarget = _createRenderTarget( params );
		cubeUVRenderTarget.depthBuffer = equirectangular ? false : true;
		_pingPongRenderTarget = _createRenderTarget( params );
		return cubeUVRenderTarget;

	}

	function _cleanup( outputTarget ) {

		_pingPongRenderTarget.dispose();
		_renderer.setRenderTarget( _oldTarget );
		outputTarget.scissorTest = false;
		// reset viewport and scissor
		outputTarget.setSize( outputTarget.width, outputTarget.height );

	}

	function _sceneToCubeUV( scene, near, far, cubeUVRenderTarget ) {

		var fov = 90;
		var aspect = 1;
		var cubeCamera = new PerspectiveCamera( fov, aspect, near, far );
		var upSign = [ 1, 1, 1, 1, - 1, 1 ];
		var forwardSign = [ 1, 1, - 1, - 1, - 1, 1 ];

		var outputEncoding = _renderer.outputEncoding;
		var toneMapping = _renderer.toneMapping;
		var toneMappingExposure = _renderer.toneMappingExposure;
		var clearColor = _renderer.getClearColor();
		var clearAlpha = _renderer.getClearAlpha();

		_renderer.toneMapping = LinearToneMapping;
		_renderer.toneMappingExposure = 1.0;
		_renderer.outputEncoding = LinearEncoding;
		scene.scale.z *= - 1;

		var background = scene.background;
		if ( background && background.isColor ) {

			background.convertSRGBToLinear();
			// Convert linear to RGBE
			var maxComponent = Math.max( background.r, background.g, background.b );
			var fExp = Math.min( Math.max( Math.ceil( Math.log2( maxComponent ) ), - 128.0 ), 127.0 );
			background = background.multiplyScalar( Math.pow( 2.0, - fExp ) );
			var alpha = ( fExp + 128.0 ) / 255.0;
			_renderer.setClearColor( background, alpha );
			scene.background = null;

		}

		for ( var i = 0; i < 6; i ++ ) {

			var 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 ] );

			}
			_setViewport( cubeUVRenderTarget,
				col * SIZE_MAX, i > 2 ? SIZE_MAX : 0, SIZE_MAX, SIZE_MAX );
			_renderer.setRenderTarget( cubeUVRenderTarget );
			_renderer.render( scene, cubeCamera );

		}

		_renderer.toneMapping = toneMapping;
		_renderer.toneMappingExposure = toneMappingExposure;
		_renderer.outputEncoding = outputEncoding;
		_renderer.setClearColor( clearColor, clearAlpha );
		scene.scale.z *= - 1;

	}

	function _textureToCubeUV( texture, cubeUVRenderTarget ) {

		var scene = new Scene();
		if ( texture.isCubeTexture ) {

			if ( _cubemapShader == null ) {

				_cubemapShader = _getCubemapShader();

			}

		} else {

			if ( _equirectShader == null ) {

				_equirectShader = _getEquirectShader();

			}

		}
		var material = texture.isCubeTexture ? _cubemapShader : _equirectShader;
		scene.add( new Mesh( _lodPlanes[ 0 ], material ) );
		var uniforms = material.uniforms;

		uniforms[ 'envMap' ].value = texture;
		if ( ! texture.isCubeTexture ) {

			uniforms[ 'texelSize' ].value.set( 1.0 / texture.image.width, 1.0 / texture.image.height );

		}
		uniforms[ 'inputEncoding' ].value = ENCODINGS[ texture.encoding ];
		uniforms[ 'outputEncoding' ].value = ENCODINGS[ texture.encoding ];

		_setViewport( cubeUVRenderTarget, 0, 0, 3 * SIZE_MAX, 2 * SIZE_MAX );
		_renderer.setRenderTarget( cubeUVRenderTarget );
		_renderer.render( scene, _flatCamera );

	}

	function _compileMaterial( material ) {

		var tmpScene = new Scene();
		tmpScene.add( new Mesh( _lodPlanes[ 0 ], material ) );
		_renderer.compile( tmpScene, _flatCamera );

	}

	function _createRenderTarget( params ) {

		var cubeUVRenderTarget = new WebGLRenderTarget( 3 * SIZE_MAX, 3 * SIZE_MAX, params );
		cubeUVRenderTarget.texture.mapping = CubeUVReflectionMapping;
		cubeUVRenderTarget.texture.name = 'PMREM.cubeUv';
		cubeUVRenderTarget.scissorTest = true;
		return cubeUVRenderTarget;

	}

	function _setViewport( target, x, y, width, height ) {

		target.viewport.set( x, y, width, height );
		target.scissor.set( x, y, width, height );

	}

	function _applyPMREM( cubeUVRenderTarget ) {

		var autoClear = _renderer.autoClear;
		_renderer.autoClear = false;

		for ( var i = 1; i < TOTAL_LODS; i ++ ) {

			var sigma = Math.sqrt(
				_sigmas[ i ] * _sigmas[ i ] -
			_sigmas[ i - 1 ] * _sigmas[ i - 1 ] );
			var poleAxis =
			_axisDirections[ ( i - 1 ) % _axisDirections.length ];
			_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.
	 */
	function _blur( cubeUVRenderTarget, lodIn, lodOut, sigma, poleAxis ) {

		_halfBlur(
			cubeUVRenderTarget,
			_pingPongRenderTarget,
			lodIn,
			lodOut,
			sigma,
			'latitudinal',
			poleAxis );

		_halfBlur(
			_pingPongRenderTarget,
			cubeUVRenderTarget,
			lodOut,
			lodOut,
			sigma,
			'longitudinal',
			poleAxis );

	}

	function _halfBlur( targetIn, targetOut, lodIn, lodOut, sigmaRadians, direction, poleAxis ) {

		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.
		var STANDARD_DEVIATIONS = 3;

		var blurScene = new Scene();
		blurScene.add( new Mesh( _lodPlanes[ lodOut ], _blurMaterial ) );
		var blurUniforms = _blurMaterial.uniforms;

		var pixels = _sizeLods[ lodIn ] - 1;
		var radiansPerPixel = isFinite( sigmaRadians ) ? Math.PI / ( 2 * pixels ) : 2 * Math.PI / ( 2 * MAX_SAMPLES - 1 );
		var sigmaPixels = sigmaRadians / radiansPerPixel;
		var 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) );

		}

		var weights = [];
		var sum = 0;

		for ( var i = 0; i < MAX_SAMPLES; ++ i ) {

			var x = i / sigmaPixels;
			var weight = Math.exp( - x * x / 2 );
			weights.push( weight );

			if ( i == 0 ) {

				sum += weight;

			} else if ( i < samples ) {

				sum += 2 * weight;

			}

		}

		for ( var i = 0; i < weights.length; i ++ ) {

			weights[ i ] = weights[ i ] / sum;

		}

		blurUniforms[ 'envMap' ].value = targetIn.texture;
		blurUniforms[ 'samples' ].value = samples;
		blurUniforms[ 'weights' ].value = weights;
		blurUniforms[ 'latitudinal' ].value = direction === 'latitudinal';
		if ( poleAxis ) {

			blurUniforms[ 'poleAxis' ].value = poleAxis;

		}
		blurUniforms[ 'dTheta' ].value = radiansPerPixel;
		blurUniforms[ 'mipInt' ].value = LOD_MAX - lodIn;
		blurUniforms[ 'inputEncoding' ].value = ENCODINGS[ targetIn.texture.encoding ];
		blurUniforms[ 'outputEncoding' ].value = ENCODINGS[ targetIn.texture.encoding ];

		var outputSize = _sizeLods[ lodOut ];
		var x = 3 * Math.max( 0, SIZE_MAX - 2 * outputSize );
		var y = ( lodOut === 0 ? 0 : 2 * SIZE_MAX ) +
		2 * outputSize *
			( lodOut > LOD_MAX - LOD_MIN ? lodOut - LOD_MAX + LOD_MIN : 0 );

		_setViewport( targetOut, x, y, 3 * outputSize, 2 * outputSize );
		_renderer.setRenderTarget( targetOut );
		_renderer.render( blurScene, _flatCamera );

	}

	function _getBlurShader( maxSamples ) {

		var weights = new Float32Array( maxSamples );
		var poleAxis = new Vector3( 0, 1, 0 );
		var shaderMaterial = new RawShaderMaterial( {

			defines: { 'n': maxSamples },

			uniforms: {
				'envMap': { value: null },
				'samples': { value: 1 },
				'weights': { value: weights },
				'latitudinal': { value: false },
				'dTheta': { value: 0 },
				'mipInt': { value: 0 },
				'poleAxis': { value: poleAxis },
				'inputEncoding': { value: ENCODINGS[ LinearEncoding ] },
				'outputEncoding': { value: ENCODINGS[ LinearEncoding ] }
			},

			vertexShader: _getCommonVertexShader(),

			fragmentShader: ("\nprecision mediump float;\nprecision mediump int;\nvarying vec3 vOutputDirection;\nuniform sampler2D envMap;\nuniform int samples;\nuniform float weights[n];\nuniform bool latitudinal;\nuniform float dTheta;\nuniform float mipInt;\nuniform vec3 poleAxis;\n\n" + (_getEncodings()) + "\n\n#define ENVMAP_TYPE_CUBE_UV\n#include <cube_uv_reflection_fragment>\n\nvoid main() {\n\tgl_FragColor = vec4(0.0);\n\tfor (int i = 0; i < n; i++) {\n\t\tif (i >= samples)\n\t\t\tbreak;\n\t\tfor (int dir = -1; dir < 2; dir += 2) {\n\t\t\tif (i == 0 && dir == 1)\n\t\t\t\tcontinue;\n\t\t\tvec3 axis = latitudinal ? poleAxis : cross(poleAxis, vOutputDirection);\n\t\t\tif (all(equal(axis, vec3(0.0))))\n\t\t\t\taxis = cross(vec3(0.0, 1.0, 0.0), vOutputDirection);\n\t\t\taxis = normalize(axis);\n\t\t\tfloat theta = dTheta * float(dir * i);\n\t\t\tfloat cosTheta = cos(theta);\n\t\t\t// Rodrigues' axis-angle rotation\n\t\t\tvec3 sampleDirection = vOutputDirection * cosTheta\n\t\t\t\t\t+ cross(axis, vOutputDirection) * sin(theta)\n\t\t\t\t\t+ axis * dot(axis, vOutputDirection) * (1.0 - cosTheta);\n\t\t\tgl_FragColor.rgb +=\n\t\t\t\t\tweights[i] * bilinearCubeUV(envMap, sampleDirection, mipInt);\n\t\t}\n\t}\n\tgl_FragColor = linearToOutputTexel(gl_FragColor);\n}\n\t\t"),

			blending: NoBlending,
			depthTest: false,
			depthWrite: false

		} );

		shaderMaterial.type = 'SphericalGaussianBlur';

		return shaderMaterial;

	}

	function _getEquirectShader() {

		var texelSize = new Vector2( 1, 1 );
		var shaderMaterial = new RawShaderMaterial( {

			uniforms: {
				'envMap': { value: null },
				'texelSize': { value: texelSize },
				'inputEncoding': { value: ENCODINGS[ LinearEncoding ] },
				'outputEncoding': { value: ENCODINGS[ LinearEncoding ] }
			},

			vertexShader: _getCommonVertexShader(),

			fragmentShader: ("\nprecision mediump float;\nprecision mediump int;\nvarying vec3 vOutputDirection;\nuniform sampler2D envMap;\nuniform vec2 texelSize;\n\n" + (_getEncodings()) + "\n\n#define RECIPROCAL_PI 0.31830988618\n#define RECIPROCAL_PI2 0.15915494\n\nvoid main() {\n\tgl_FragColor = vec4(0.0);\n\tvec3 outputDirection = normalize(vOutputDirection);\n\tvec2 uv;\n\tuv.y = asin(clamp(outputDirection.y, -1.0, 1.0)) * RECIPROCAL_PI + 0.5;\n\tuv.x = atan(outputDirection.z, outputDirection.x) * RECIPROCAL_PI2 + 0.5;\n\tvec2 f = fract(uv / texelSize - 0.5);\n\tuv -= f * texelSize;\n\tvec3 tl = envMapTexelToLinear(texture2D(envMap, uv)).rgb;\n\tuv.x += texelSize.x;\n\tvec3 tr = envMapTexelToLinear(texture2D(envMap, uv)).rgb;\n\tuv.y += texelSize.y;\n\tvec3 br = envMapTexelToLinear(texture2D(envMap, uv)).rgb;\n\tuv.x -= texelSize.x;\n\tvec3 bl = envMapTexelToLinear(texture2D(envMap, uv)).rgb;\n\tvec3 tm = mix(tl, tr, f.x);\n\tvec3 bm = mix(bl, br, f.x);\n\tgl_FragColor.rgb = mix(tm, bm, f.y);\n\tgl_FragColor = linearToOutputTexel(gl_FragColor);\n}\n\t\t"),

			blending: NoBlending,
			depthTest: false,
			depthWrite: false

		} );

		shaderMaterial.type = 'EquirectangularToCubeUV';

		return shaderMaterial;

	}

	function _getCubemapShader() {

		var shaderMaterial = new RawShaderMaterial( {

			uniforms: {
				'envMap': { value: null },
				'inputEncoding': { value: ENCODINGS[ LinearEncoding ] },
				'outputEncoding': { value: ENCODINGS[ LinearEncoding ] }
			},

			vertexShader: _getCommonVertexShader(),

			fragmentShader: ("\nprecision mediump float;\nprecision mediump int;\nvarying vec3 vOutputDirection;\nuniform samplerCube envMap;\n\n" + (_getEncodings()) + "\n\nvoid main() {\n\tgl_FragColor = vec4(0.0);\n\tgl_FragColor.rgb = envMapTexelToLinear(textureCube(envMap, vec3( - vOutputDirection.x, vOutputDirection.yz ))).rgb;\n\tgl_FragColor = linearToOutputTexel(gl_FragColor);\n}\n\t\t"),

			blending: NoBlending,
			depthTest: false,
			depthWrite: false

		} );

		shaderMaterial.type = 'CubemapToCubeUV';

		return shaderMaterial;

	}

	function _getCommonVertexShader() {

		return "\nprecision mediump float;\nprecision mediump int;\nattribute vec3 position;\nattribute vec2 uv;\nattribute float faceIndex;\nvarying vec3 vOutputDirection;\nvec3 getDirection(vec2 uv, float face) {\n\tuv = 2.0 * uv - 1.0;\n\tvec3 direction = vec3(uv, 1.0);\n\tif (face == 0.0) {\n\t\tdirection = direction.zyx;\n\t\tdirection.z *= -1.0;\n\t} else if (face == 1.0) {\n\t\tdirection = direction.xzy;\n\t\tdirection.z *= -1.0;\n\t} else if (face == 3.0) {\n\t\tdirection = direction.zyx;\n\t\tdirection.x *= -1.0;\n\t} else if (face == 4.0) {\n\t\tdirection = direction.xzy;\n\t\tdirection.y *= -1.0;\n\t} else if (face == 5.0) {\n\t\tdirection.xz *= -1.0;\n\t}\n\treturn direction;\n}\nvoid main() {\n\tvOutputDirection = getDirection(uv, faceIndex);\n\tgl_Position = vec4( position, 1.0 );\n}\n\t";

	}

	function _getEncodings() {

		return "\nuniform int inputEncoding;\nuniform int outputEncoding;\n\n#include <encodings_pars_fragment>\n\nvec4 inputTexelToLinear(vec4 value){\n\tif(inputEncoding == 0){\n\t\treturn value;\n\t}else if(inputEncoding == 1){\n\t\treturn sRGBToLinear(value);\n\t}else if(inputEncoding == 2){\n\t\treturn RGBEToLinear(value);\n\t}else if(inputEncoding == 3){\n\t\treturn RGBMToLinear(value, 7.0);\n\t}else if(inputEncoding == 4){\n\t\treturn RGBMToLinear(value, 16.0);\n\t}else if(inputEncoding == 5){\n\t\treturn RGBDToLinear(value, 256.0);\n\t}else{\n\t\treturn GammaToLinear(value, 2.2);\n\t}\n}\n\nvec4 linearToOutputTexel(vec4 value){\n\tif(outputEncoding == 0){\n\t\treturn value;\n\t}else if(outputEncoding == 1){\n\t\treturn LinearTosRGB(value);\n\t}else if(outputEncoding == 2){\n\t\treturn LinearToRGBE(value);\n\t}else if(outputEncoding == 3){\n\t\treturn LinearToRGBM(value, 7.0);\n\t}else if(outputEncoding == 4){\n\t\treturn LinearToRGBM(value, 16.0);\n\t}else if(outputEncoding == 5){\n\t\treturn LinearToRGBD(value, 256.0);\n\t}else{\n\t\treturn LinearToGamma(value, 2.2);\n\t}\n}\n\nvec4 envMapTexelToLinear(vec4 color) {\n\treturn inputTexelToLinear(color);\n}\n\t";

	}

	/**
	 * @author mrdoob / http://mrdoob.com/
	 */

	function Face4( a, b, c, d, normal, color, materialIndex ) {

		console.warn( 'THREE.Face4 has been removed. A THREE.Face3 will be created instead.' );
		return new Face3( a, b, c, normal, color, materialIndex );

	}

	var LineStrip = 0;
	var LinePieces = 1;
	var NoColors = 0;
	var FaceColors = 1;
	var VertexColors = 2;

	function MeshFaceMaterial( materials ) {

		console.warn( 'THREE.MeshFaceMaterial has been removed. Use an Array instead.' );
		return materials;

	}

	function MultiMaterial( materials ) {

		if ( materials === undefined ) { materials = []; }

		console.warn( 'THREE.MultiMaterial has been removed. Use an Array instead.' );
		materials.isMultiMaterial = true;
		materials.materials = materials;
		materials.clone = function () {

			return materials.slice();

		};
		return materials;

	}

	function PointCloud( geometry, material ) {

		console.warn( 'THREE.PointCloud has been renamed to THREE.Points.' );
		return new Points( geometry, material );

	}

	function Particle( material ) {

		console.warn( 'THREE.Particle has been renamed to THREE.Sprite.' );
		return new Sprite( material );

	}

	function ParticleSystem( geometry, material ) {

		console.warn( 'THREE.ParticleSystem has been renamed to THREE.Points.' );
		return new Points( geometry, material );

	}

	function PointCloudMaterial( parameters ) {

		console.warn( 'THREE.PointCloudMaterial has been renamed to THREE.PointsMaterial.' );
		return new PointsMaterial( parameters );

	}

	function ParticleBasicMaterial( parameters ) {

		console.warn( 'THREE.ParticleBasicMaterial has been renamed to THREE.PointsMaterial.' );
		return new PointsMaterial( parameters );

	}

	function ParticleSystemMaterial( parameters ) {

		console.warn( 'THREE.ParticleSystemMaterial has been renamed to THREE.PointsMaterial.' );
		return new PointsMaterial( parameters );

	}

	function Vertex( x, y, z ) {

		console.warn( 'THREE.Vertex has been removed. Use THREE.Vector3 instead.' );
		return new Vector3( x, y, z );

	}

	//

	function DynamicBufferAttribute( array, itemSize ) {

		console.warn( 'THREE.DynamicBufferAttribute has been removed. Use new THREE.BufferAttribute().setUsage( THREE.DynamicDrawUsage ) instead.' );
		return new BufferAttribute( array, itemSize ).setUsage( DynamicDrawUsage );

	}

	function Int8Attribute( array, itemSize ) {

		console.warn( 'THREE.Int8Attribute has been removed. Use new THREE.Int8BufferAttribute() instead.' );
		return new Int8BufferAttribute( array, itemSize );

	}

	function Uint8Attribute( array, itemSize ) {

		console.warn( 'THREE.Uint8Attribute has been removed. Use new THREE.Uint8BufferAttribute() instead.' );
		return new Uint8BufferAttribute( array, itemSize );

	}

	function Uint8ClampedAttribute( array, itemSize ) {

		console.warn( 'THREE.Uint8ClampedAttribute has been removed. Use new THREE.Uint8ClampedBufferAttribute() instead.' );
		return new Uint8ClampedBufferAttribute( array, itemSize );

	}

	function Int16Attribute( array, itemSize ) {

		console.warn( 'THREE.Int16Attribute has been removed. Use new THREE.Int16BufferAttribute() instead.' );
		return new Int16BufferAttribute( array, itemSize );

	}

	function Uint16Attribute( array, itemSize ) {

		console.warn( 'THREE.Uint16Attribute has been removed. Use new THREE.Uint16BufferAttribute() instead.' );
		return new Uint16BufferAttribute( array, itemSize );

	}

	function Int32Attribute( array, itemSize ) {

		console.warn( 'THREE.Int32Attribute has been removed. Use new THREE.Int32BufferAttribute() instead.' );
		return new Int32BufferAttribute( array, itemSize );

	}

	function Uint32Attribute( array, itemSize ) {

		console.warn( 'THREE.Uint32Attribute has been removed. Use new THREE.Uint32BufferAttribute() instead.' );
		return new Uint32BufferAttribute( array, itemSize );

	}

	function Float32Attribute( array, itemSize ) {

		console.warn( 'THREE.Float32Attribute has been removed. Use new THREE.Float32BufferAttribute() instead.' );
		return new Float32BufferAttribute( array, itemSize );

	}

	function Float64Attribute( array, itemSize ) {

		console.warn( 'THREE.Float64Attribute has been removed. Use new THREE.Float64BufferAttribute() instead.' );
		return new Float64BufferAttribute( array, itemSize );

	}

	//

	Curve.create = function ( construct, getPoint ) {

		console.log( 'THREE.Curve.create() has been deprecated' );

		construct.prototype = Object.create( Curve.prototype );
		construct.prototype.constructor = construct;
		construct.prototype.getPoint = getPoint;

		return construct;

	};

	//

	Object.assign( CurvePath.prototype, {

		createPointsGeometry: function ( divisions ) {

			console.warn( 'THREE.CurvePath: .createPointsGeometry() has been removed. Use new THREE.Geometry().setFromPoints( points ) instead.' );

			// generate geometry from path points (for Line or Points objects)

			var pts = this.getPoints( divisions );
			return this.createGeometry( pts );

		},

		createSpacedPointsGeometry: function ( divisions ) {

			console.warn( 'THREE.CurvePath: .createSpacedPointsGeometry() has been removed. Use new THREE.Geometry().setFromPoints( points ) instead.' );

			// generate geometry from equidistant sampling along the path

			var pts = this.getSpacedPoints( divisions );
			return this.createGeometry( pts );

		},

		createGeometry: function ( points ) {

			console.warn( 'THREE.CurvePath: .createGeometry() has been removed. Use new THREE.Geometry().setFromPoints( points ) instead.' );

			var geometry = new Geometry();

			for ( var i = 0, l = points.length; i < l; i ++ ) {

				var point = points[ i ];
				geometry.vertices.push( new Vector3( point.x, point.y, point.z || 0 ) );

			}

			return geometry;

		}

	} );

	//

	Object.assign( Path.prototype, {

		fromPoints: function ( points ) {

			console.warn( 'THREE.Path: .fromPoints() has been renamed to .setFromPoints().' );
			return this.setFromPoints( points );

		}

	} );

	//

	function ClosedSplineCurve3( points ) {

		console.warn( 'THREE.ClosedSplineCurve3 has been deprecated. Use THREE.CatmullRomCurve3 instead.' );

		CatmullRomCurve3.call( this, points );
		this.type = 'catmullrom';
		this.closed = true;

	}

	ClosedSplineCurve3.prototype = Object.create( CatmullRomCurve3.prototype );

	//

	function SplineCurve3( points ) {

		console.warn( 'THREE.SplineCurve3 has been deprecated. Use THREE.CatmullRomCurve3 instead.' );

		CatmullRomCurve3.call( this, points );
		this.type = 'catmullrom';

	}

	SplineCurve3.prototype = Object.create( CatmullRomCurve3.prototype );

	//

	function Spline( points ) {

		console.warn( 'THREE.Spline has been removed. Use THREE.CatmullRomCurve3 instead.' );

		CatmullRomCurve3.call( this, points );
		this.type = 'catmullrom';

	}

	Spline.prototype = Object.create( CatmullRomCurve3.prototype );

	Object.assign( Spline.prototype, {

		initFromArray: function ( /* a */ ) {

			console.error( 'THREE.Spline: .initFromArray() has been removed.' );

		},
		getControlPointsArray: function ( /* optionalTarget */ ) {

			console.error( 'THREE.Spline: .getControlPointsArray() has been removed.' );

		},
		reparametrizeByArcLength: function ( /* samplingCoef */ ) {

			console.error( 'THREE.Spline: .reparametrizeByArcLength() has been removed.' );

		}

	} );

	//

	function AxisHelper( size ) {

		console.warn( 'THREE.AxisHelper has been renamed to THREE.AxesHelper.' );
		return new AxesHelper( size );

	}

	function BoundingBoxHelper( object, color ) {

		console.warn( 'THREE.BoundingBoxHelper has been deprecated. Creating a THREE.BoxHelper instead.' );
		return new BoxHelper( object, color );

	}

	function EdgesHelper( object, hex ) {

		console.warn( 'THREE.EdgesHelper has been removed. Use THREE.EdgesGeometry instead.' );
		return new LineSegments( new EdgesGeometry( object.geometry ), new LineBasicMaterial( { color: hex !== undefined ? hex : 0xffffff } ) );

	}

	GridHelper.prototype.setColors = function () {

		console.error( 'THREE.GridHelper: setColors() has been deprecated, pass them in the constructor instead.' );

	};

	SkeletonHelper.prototype.update = function () {

		console.error( 'THREE.SkeletonHelper: update() no longer needs to be called.' );

	};

	function WireframeHelper( object, hex ) {

		console.warn( 'THREE.WireframeHelper has been removed. Use THREE.WireframeGeometry instead.' );
		return new LineSegments( new WireframeGeometry( object.geometry ), new LineBasicMaterial( { color: hex !== undefined ? hex : 0xffffff } ) );

	}

	//

	Object.assign( Loader.prototype, {

		extractUrlBase: function ( url ) {

			console.warn( 'THREE.Loader: .extractUrlBase() has been deprecated. Use THREE.LoaderUtils.extractUrlBase() instead.' );
			return LoaderUtils.extractUrlBase( url );

		}

	} );

	Loader.Handlers = {

		add: function ( /* regex, loader */ ) {

			console.error( 'THREE.Loader: Handlers.add() has been removed. Use LoadingManager.addHandler() instead.' );

		},

		get: function ( /* file */ ) {

			console.error( 'THREE.Loader: Handlers.get() has been removed. Use LoadingManager.getHandler() instead.' );

		}

	};

	function XHRLoader( manager ) {

		console.warn( 'THREE.XHRLoader has been renamed to THREE.FileLoader.' );
		return new FileLoader( manager );

	}

	function BinaryTextureLoader( manager ) {

		console.warn( 'THREE.BinaryTextureLoader has been renamed to THREE.DataTextureLoader.' );
		return new DataTextureLoader( manager );

	}

	Object.assign( ObjectLoader.prototype, {

		setTexturePath: function ( value ) {

			console.warn( 'THREE.ObjectLoader: .setTexturePath() has been renamed to .setResourcePath().' );
			return this.setResourcePath( value );

		}

	} );

	//

	Object.assign( Box2.prototype, {

		center: function ( optionalTarget ) {

			console.warn( 'THREE.Box2: .center() has been renamed to .getCenter().' );
			return this.getCenter( optionalTarget );

		},
		empty: function () {

			console.warn( 'THREE.Box2: .empty() has been renamed to .isEmpty().' );
			return this.isEmpty();

		},
		isIntersectionBox: function ( box ) {

			console.warn( 'THREE.Box2: .isIntersectionBox() has been renamed to .intersectsBox().' );
			return this.intersectsBox( box );

		},
		size: function ( optionalTarget ) {

			console.warn( 'THREE.Box2: .size() has been renamed to .getSize().' );
			return this.getSize( optionalTarget );

		}
	} );

	Object.assign( Box3.prototype, {

		center: function ( optionalTarget ) {

			console.warn( 'THREE.Box3: .center() has been renamed to .getCenter().' );
			return this.getCenter( optionalTarget );

		},
		empty: function () {

			console.warn( 'THREE.Box3: .empty() has been renamed to .isEmpty().' );
			return this.isEmpty();

		},
		isIntersectionBox: function ( box ) {

			console.warn( 'THREE.Box3: .isIntersectionBox() has been renamed to .intersectsBox().' );
			return this.intersectsBox( box );

		},
		isIntersectionSphere: function ( sphere ) {

			console.warn( 'THREE.Box3: .isIntersectionSphere() has been renamed to .intersectsSphere().' );
			return this.intersectsSphere( sphere );

		},
		size: function ( optionalTarget ) {

			console.warn( 'THREE.Box3: .size() has been renamed to .getSize().' );
			return this.getSize( optionalTarget );

		}
	} );

	Frustum.prototype.setFromMatrix = function ( m ) {

		console.warn( 'THREE.Frustum: .setFromMatrix() has been renamed to .setFromProjectionMatrix().' );
		return this.setFromProjectionMatrix( m );

	};

	Line3.prototype.center = function ( optionalTarget ) {

		console.warn( 'THREE.Line3: .center() has been renamed to .getCenter().' );
		return this.getCenter( optionalTarget );

	};

	Object.assign( MathUtils, {

		random16: function () {

			console.warn( 'THREE.Math: .random16() has been deprecated. Use Math.random() instead.' );
			return Math.random();

		},

		nearestPowerOfTwo: function ( value ) {

			console.warn( 'THREE.Math: .nearestPowerOfTwo() has been renamed to .floorPowerOfTwo().' );
			return MathUtils.floorPowerOfTwo( value );

		},

		nextPowerOfTwo: function ( value ) {

			console.warn( 'THREE.Math: .nextPowerOfTwo() has been renamed to .ceilPowerOfTwo().' );
			return MathUtils.ceilPowerOfTwo( value );

		}

	} );

	Object.assign( Matrix3.prototype, {

		flattenToArrayOffset: function ( array, offset ) {

			console.warn( "THREE.Matrix3: .flattenToArrayOffset() has been deprecated. Use .toArray() instead." );
			return this.toArray( array, offset );

		},
		multiplyVector3: function ( vector ) {

			console.warn( 'THREE.Matrix3: .multiplyVector3() has been removed. Use vector.applyMatrix3( matrix ) instead.' );
			return vector.applyMatrix3( this );

		},
		multiplyVector3Array: function ( /* a */ ) {

			console.error( 'THREE.Matrix3: .multiplyVector3Array() has been removed.' );

		},
		applyToBufferAttribute: function ( attribute ) {

			console.warn( 'THREE.Matrix3: .applyToBufferAttribute() has been removed. Use attribute.applyMatrix3( matrix ) instead.' );
			return attribute.applyMatrix3( this );

		},
		applyToVector3Array: function ( /* array, offset, length */ ) {

			console.error( 'THREE.Matrix3: .applyToVector3Array() has been removed.' );

		}

	} );

	Object.assign( Matrix4.prototype, {

		extractPosition: function ( m ) {

			console.warn( 'THREE.Matrix4: .extractPosition() has been renamed to .copyPosition().' );
			return this.copyPosition( m );

		},
		flattenToArrayOffset: function ( array, offset ) {

			console.warn( "THREE.Matrix4: .flattenToArrayOffset() has been deprecated. Use .toArray() instead." );
			return this.toArray( array, offset );

		},
		getPosition: function () {

			console.warn( 'THREE.Matrix4: .getPosition() has been removed. Use Vector3.setFromMatrixPosition( matrix ) instead.' );
			return new Vector3().setFromMatrixColumn( this, 3 );

		},
		setRotationFromQuaternion: function ( q ) {

			console.warn( 'THREE.Matrix4: .setRotationFromQuaternion() has been renamed to .makeRotationFromQuaternion().' );
			return this.makeRotationFromQuaternion( q );

		},
		multiplyToArray: function () {

			console.warn( 'THREE.Matrix4: .multiplyToArray() has been removed.' );

		},
		multiplyVector3: function ( vector ) {

			console.warn( 'THREE.Matrix4: .multiplyVector3() has been removed. Use vector.applyMatrix4( matrix ) instead.' );
			return vector.applyMatrix4( this );

		},
		multiplyVector4: function ( vector ) {

			console.warn( 'THREE.Matrix4: .multiplyVector4() has been removed. Use vector.applyMatrix4( matrix ) instead.' );
			return vector.applyMatrix4( this );

		},
		multiplyVector3Array: function ( /* a */ ) {

			console.error( 'THREE.Matrix4: .multiplyVector3Array() has been removed.' );

		},
		rotateAxis: function ( v ) {

			console.warn( 'THREE.Matrix4: .rotateAxis() has been removed. Use Vector3.transformDirection( matrix ) instead.' );
			v.transformDirection( this );

		},
		crossVector: function ( vector ) {

			console.warn( 'THREE.Matrix4: .crossVector() has been removed. Use vector.applyMatrix4( matrix ) instead.' );
			return vector.applyMatrix4( this );

		},
		translate: function () {

			console.error( 'THREE.Matrix4: .translate() has been removed.' );

		},
		rotateX: function () {

			console.error( 'THREE.Matrix4: .rotateX() has been removed.' );

		},
		rotateY: function () {

			console.error( 'THREE.Matrix4: .rotateY() has been removed.' );

		},
		rotateZ: function () {

			console.error( 'THREE.Matrix4: .rotateZ() has been removed.' );

		},
		rotateByAxis: function () {

			console.error( 'THREE.Matrix4: .rotateByAxis() has been removed.' );

		},
		applyToBufferAttribute: function ( attribute ) {

			console.warn( 'THREE.Matrix4: .applyToBufferAttribute() has been removed. Use attribute.applyMatrix4( matrix ) instead.' );
			return attribute.applyMatrix4( this );

		},
		applyToVector3Array: function ( /* array, offset, length */ ) {

			console.error( 'THREE.Matrix4: .applyToVector3Array() has been removed.' );

		},
		makeFrustum: function ( left, right, bottom, top, near, far ) {

			console.warn( 'THREE.Matrix4: .makeFrustum() has been removed. Use .makePerspective( left, right, top, bottom, near, far ) instead.' );
			return this.makePerspective( left, right, top, bottom, near, far );

		}

	} );

	Plane.prototype.isIntersectionLine = function ( line ) {

		console.warn( 'THREE.Plane: .isIntersectionLine() has been renamed to .intersectsLine().' );
		return this.intersectsLine( line );

	};

	Quaternion.prototype.multiplyVector3 = function ( vector ) {

		console.warn( 'THREE.Quaternion: .multiplyVector3() has been removed. Use is now vector.applyQuaternion( quaternion ) instead.' );
		return vector.applyQuaternion( this );

	};

	Object.assign( Ray.prototype, {

		isIntersectionBox: function ( box ) {

			console.warn( 'THREE.Ray: .isIntersectionBox() has been renamed to .intersectsBox().' );
			return this.intersectsBox( box );

		},
		isIntersectionPlane: function ( plane ) {

			console.warn( 'THREE.Ray: .isIntersectionPlane() has been renamed to .intersectsPlane().' );
			return this.intersectsPlane( plane );

		},
		isIntersectionSphere: function ( sphere ) {

			console.warn( 'THREE.Ray: .isIntersectionSphere() has been renamed to .intersectsSphere().' );
			return this.intersectsSphere( sphere );

		}

	} );

	Object.assign( Triangle.prototype, {

		area: function () {

			console.warn( 'THREE.Triangle: .area() has been renamed to .getArea().' );
			return this.getArea();

		},
		barycoordFromPoint: function ( point, target ) {

			console.warn( 'THREE.Triangle: .barycoordFromPoint() has been renamed to .getBarycoord().' );
			return this.getBarycoord( point, target );

		},
		midpoint: function ( target ) {

			console.warn( 'THREE.Triangle: .midpoint() has been renamed to .getMidpoint().' );
			return this.getMidpoint( target );

		},
		normal: function ( target ) {

			console.warn( 'THREE.Triangle: .normal() has been renamed to .getNormal().' );
			return this.getNormal( target );

		},
		plane: function ( target ) {

			console.warn( 'THREE.Triangle: .plane() has been renamed to .getPlane().' );
			return this.getPlane( target );

		}

	} );

	Object.assign( Triangle, {

		barycoordFromPoint: function ( point, a, b, c, target ) {

			console.warn( 'THREE.Triangle: .barycoordFromPoint() has been renamed to .getBarycoord().' );
			return Triangle.getBarycoord( point, a, b, c, target );

		},
		normal: function ( a, b, c, target ) {

			console.warn( 'THREE.Triangle: .normal() has been renamed to .getNormal().' );
			return Triangle.getNormal( a, b, c, target );

		}

	} );

	Object.assign( Shape.prototype, {

		extractAllPoints: function ( divisions ) {

			console.warn( 'THREE.Shape: .extractAllPoints() has been removed. Use .extractPoints() instead.' );
			return this.extractPoints( divisions );

		},
		extrude: function ( options ) {

			console.warn( 'THREE.Shape: .extrude() has been removed. Use ExtrudeGeometry() instead.' );
			return new ExtrudeGeometry( this, options );

		},
		makeGeometry: function ( options ) {

			console.warn( 'THREE.Shape: .makeGeometry() has been removed. Use ShapeGeometry() instead.' );
			return new ShapeGeometry( this, options );

		}

	} );

	Object.assign( Vector2.prototype, {

		fromAttribute: function ( attribute, index, offset ) {

			console.warn( 'THREE.Vector2: .fromAttribute() has been renamed to .fromBufferAttribute().' );
			return this.fromBufferAttribute( attribute, index, offset );

		},
		distanceToManhattan: function ( v ) {

			console.warn( 'THREE.Vector2: .distanceToManhattan() has been renamed to .manhattanDistanceTo().' );
			return this.manhattanDistanceTo( v );

		},
		lengthManhattan: function () {

			console.warn( 'THREE.Vector2: .lengthManhattan() has been renamed to .manhattanLength().' );
			return this.manhattanLength();

		}

	} );

	Object.assign( Vector3.prototype, {

		setEulerFromRotationMatrix: function () {

			console.error( 'THREE.Vector3: .setEulerFromRotationMatrix() has been removed. Use Euler.setFromRotationMatrix() instead.' );

		},
		setEulerFromQuaternion: function () {

			console.error( 'THREE.Vector3: .setEulerFromQuaternion() has been removed. Use Euler.setFromQuaternion() instead.' );

		},
		getPositionFromMatrix: function ( m ) {

			console.warn( 'THREE.Vector3: .getPositionFromMatrix() has been renamed to .setFromMatrixPosition().' );
			return this.setFromMatrixPosition( m );

		},
		getScaleFromMatrix: function ( m ) {

			console.warn( 'THREE.Vector3: .getScaleFromMatrix() has been renamed to .setFromMatrixScale().' );
			return this.setFromMatrixScale( m );

		},
		getColumnFromMatrix: function ( index, matrix ) {

			console.warn( 'THREE.Vector3: .getColumnFromMatrix() has been renamed to .setFromMatrixColumn().' );
			return this.setFromMatrixColumn( matrix, index );

		},
		applyProjection: function ( m ) {

			console.warn( 'THREE.Vector3: .applyProjection() has been removed. Use .applyMatrix4( m ) instead.' );
			return this.applyMatrix4( m );

		},
		fromAttribute: function ( attribute, index, offset ) {

			console.warn( 'THREE.Vector3: .fromAttribute() has been renamed to .fromBufferAttribute().' );
			return this.fromBufferAttribute( attribute, index, offset );

		},
		distanceToManhattan: function ( v ) {

			console.warn( 'THREE.Vector3: .distanceToManhattan() has been renamed to .manhattanDistanceTo().' );
			return this.manhattanDistanceTo( v );

		},
		lengthManhattan: function () {

			console.warn( 'THREE.Vector3: .lengthManhattan() has been renamed to .manhattanLength().' );
			return this.manhattanLength();

		}

	} );

	Object.assign( Vector4.prototype, {

		fromAttribute: function ( attribute, index, offset ) {

			console.warn( 'THREE.Vector4: .fromAttribute() has been renamed to .fromBufferAttribute().' );
			return this.fromBufferAttribute( attribute, index, offset );

		},
		lengthManhattan: function () {

			console.warn( 'THREE.Vector4: .lengthManhattan() has been renamed to .manhattanLength().' );
			return this.manhattanLength();

		}

	} );

	//

	Object.assign( Geometry.prototype, {

		computeTangents: function () {

			console.error( 'THREE.Geometry: .computeTangents() has been removed.' );

		},
		computeLineDistances: function () {

			console.error( 'THREE.Geometry: .computeLineDistances() has been removed. Use THREE.Line.computeLineDistances() instead.' );

		},
		applyMatrix: function ( matrix ) {

			console.warn( 'THREE.Geometry: .applyMatrix() has been renamed to .applyMatrix4().' );
			return this.applyMatrix4( matrix );

		}

	} );

	Object.assign( Object3D.prototype, {

		getChildByName: function ( name ) {

			console.warn( 'THREE.Object3D: .getChildByName() has been renamed to .getObjectByName().' );
			return this.getObjectByName( name );

		},
		renderDepth: function () {

			console.warn( 'THREE.Object3D: .renderDepth has been removed. Use .renderOrder, instead.' );

		},
		translate: function ( distance, axis ) {

			console.warn( 'THREE.Object3D: .translate() has been removed. Use .translateOnAxis( axis, distance ) instead.' );
			return this.translateOnAxis( axis, distance );

		},
		getWorldRotation: function () {

			console.error( 'THREE.Object3D: .getWorldRotation() has been removed. Use THREE.Object3D.getWorldQuaternion( target ) instead.' );

		},
		applyMatrix: function ( matrix ) {

			console.warn( 'THREE.Object3D: .applyMatrix() has been renamed to .applyMatrix4().' );
			return this.applyMatrix4( matrix );

		}

	} );

	Object.defineProperties( Object3D.prototype, {

		eulerOrder: {
			get: function () {

				console.warn( 'THREE.Object3D: .eulerOrder is now .rotation.order.' );
				return this.rotation.order;

			},
			set: function ( value ) {

				console.warn( 'THREE.Object3D: .eulerOrder is now .rotation.order.' );
				this.rotation.order = value;

			}
		},
		useQuaternion: {
			get: function () {

				console.warn( 'THREE.Object3D: .useQuaternion has been removed. The library now uses quaternions by default.' );

			},
			set: function () {

				console.warn( 'THREE.Object3D: .useQuaternion has been removed. The library now uses quaternions by default.' );

			}
		}

	} );

	Object.assign( Mesh.prototype, {

		setDrawMode: function () {

			console.error( 'THREE.Mesh: .setDrawMode() has been removed. The renderer now always assumes THREE.TrianglesDrawMode. Transform your geometry via BufferGeometryUtils.toTrianglesDrawMode() if necessary.' );

		},

	} );

	Object.defineProperties( Mesh.prototype, {

		drawMode: {
			get: function () {

				console.error( 'THREE.Mesh: .drawMode has been removed. The renderer now always assumes THREE.TrianglesDrawMode.' );
				return TrianglesDrawMode;

			},
			set: function () {

				console.error( 'THREE.Mesh: .drawMode has been removed. The renderer now always assumes THREE.TrianglesDrawMode. Transform your geometry via BufferGeometryUtils.toTrianglesDrawMode() if necessary.' );

			}
		}

	} );

	Object.defineProperties( LOD.prototype, {

		objects: {
			get: function () {

				console.warn( 'THREE.LOD: .objects has been renamed to .levels.' );
				return this.levels;

			}
		}

	} );

	Object.defineProperty( Skeleton.prototype, 'useVertexTexture', {

		get: function () {

			console.warn( 'THREE.Skeleton: useVertexTexture has been removed.' );

		},
		set: function () {

			console.warn( 'THREE.Skeleton: useVertexTexture has been removed.' );

		}

	} );

	SkinnedMesh.prototype.initBones = function () {

		console.error( 'THREE.SkinnedMesh: initBones() has been removed.' );

	};

	Object.defineProperty( Curve.prototype, '__arcLengthDivisions', {

		get: function () {

			console.warn( 'THREE.Curve: .__arcLengthDivisions is now .arcLengthDivisions.' );
			return this.arcLengthDivisions;

		},
		set: function ( value ) {

			console.warn( 'THREE.Curve: .__arcLengthDivisions is now .arcLengthDivisions.' );
			this.arcLengthDivisions = value;

		}

	} );

	//

	PerspectiveCamera.prototype.setLens = function ( focalLength, filmGauge ) {

		console.warn( "THREE.PerspectiveCamera.setLens is deprecated. " +
				"Use .setFocalLength and .filmGauge for a photographic setup." );

		if ( filmGauge !== undefined ) { this.filmGauge = filmGauge; }
		this.setFocalLength( focalLength );

	};

	//

	Object.defineProperties( Light.prototype, {
		onlyShadow: {
			set: function () {

				console.warn( 'THREE.Light: .onlyShadow has been removed.' );

			}
		},
		shadowCameraFov: {
			set: function ( value ) {

				console.warn( 'THREE.Light: .shadowCameraFov is now .shadow.camera.fov.' );
				this.shadow.camera.fov = value;

			}
		},
		shadowCameraLeft: {
			set: function ( value ) {

				console.warn( 'THREE.Light: .shadowCameraLeft is now .shadow.camera.left.' );
				this.shadow.camera.left = value;

			}
		},
		shadowCameraRight: {
			set: function ( value ) {

				console.warn( 'THREE.Light: .shadowCameraRight is now .shadow.camera.right.' );
				this.shadow.camera.right = value;

			}
		},
		shadowCameraTop: {
			set: function ( value ) {

				console.warn( 'THREE.Light: .shadowCameraTop is now .shadow.camera.top.' );
				this.shadow.camera.top = value;

			}
		},
		shadowCameraBottom: {
			set: function ( value ) {

				console.warn( 'THREE.Light: .shadowCameraBottom is now .shadow.camera.bottom.' );
				this.shadow.camera.bottom = value;

			}
		},
		shadowCameraNear: {
			set: function ( value ) {

				console.warn( 'THREE.Light: .shadowCameraNear is now .shadow.camera.near.' );
				this.shadow.camera.near = value;

			}
		},
		shadowCameraFar: {
			set: function ( value ) {

				console.warn( 'THREE.Light: .shadowCameraFar is now .shadow.camera.far.' );
				this.shadow.camera.far = value;

			}
		},
		shadowCameraVisible: {
			set: function () {

				console.warn( 'THREE.Light: .shadowCameraVisible has been removed. Use new THREE.CameraHelper( light.shadow.camera ) instead.' );

			}
		},
		shadowBias: {
			set: function ( value ) {

				console.warn( 'THREE.Light: .shadowBias is now .shadow.bias.' );
				this.shadow.bias = value;

			}
		},
		shadowDarkness: {
			set: function () {

				console.warn( 'THREE.Light: .shadowDarkness has been removed.' );

			}
		},
		shadowMapWidth: {
			set: function ( value ) {

				console.warn( 'THREE.Light: .shadowMapWidth is now .shadow.mapSize.width.' );
				this.shadow.mapSize.width = value;

			}
		},
		shadowMapHeight: {
			set: function ( value ) {

				console.warn( 'THREE.Light: .shadowMapHeight is now .shadow.mapSize.height.' );
				this.shadow.mapSize.height = value;

			}
		}
	} );

	//

	Object.defineProperties( BufferAttribute.prototype, {

		length: {
			get: function () {

				console.warn( 'THREE.BufferAttribute: .length has been deprecated. Use .count instead.' );
				return this.array.length;

			}
		},
		dynamic: {
			get: function () {

				console.warn( 'THREE.BufferAttribute: .dynamic has been deprecated. Use .usage instead.' );
				return this.usage === DynamicDrawUsage;

			},
			set: function ( /* value */ ) {

				console.warn( 'THREE.BufferAttribute: .dynamic has been deprecated. Use .usage instead.' );
				this.setUsage( DynamicDrawUsage );

			}
		}

	} );

	Object.assign( BufferAttribute.prototype, {
		setDynamic: function ( value ) {

			console.warn( 'THREE.BufferAttribute: .setDynamic() has been deprecated. Use .setUsage() instead.' );
			this.setUsage( value === true ? DynamicDrawUsage : StaticDrawUsage );
			return this;

		},
		copyIndicesArray: function ( /* indices */ ) {

			console.error( 'THREE.BufferAttribute: .copyIndicesArray() has been removed.' );

		},
		setArray: function ( /* array */ ) {

			console.error( 'THREE.BufferAttribute: .setArray has been removed. Use BufferGeometry .setAttribute to replace/resize attribute buffers' );

		}
	} );

	Object.assign( BufferGeometry.prototype, {

		addIndex: function ( index ) {

			console.warn( 'THREE.BufferGeometry: .addIndex() has been renamed to .setIndex().' );
			this.setIndex( index );

		},
		addAttribute: function ( name, attribute ) {

			console.warn( 'THREE.BufferGeometry: .addAttribute() has been renamed to .setAttribute().' );

			if ( ! ( attribute && attribute.isBufferAttribute ) && ! ( attribute && attribute.isInterleavedBufferAttribute ) ) {

				console.warn( 'THREE.BufferGeometry: .addAttribute() now expects ( name, attribute ).' );

				return this.setAttribute( name, new BufferAttribute( arguments[ 1 ], arguments[ 2 ] ) );

			}

			if ( name === 'index' ) {

				console.warn( 'THREE.BufferGeometry.addAttribute: Use .setIndex() for index attribute.' );
				this.setIndex( attribute );

				return this;

			}

			return this.setAttribute( name, attribute );

		},
		addDrawCall: function ( start, count, indexOffset ) {

			if ( indexOffset !== undefined ) {

				console.warn( 'THREE.BufferGeometry: .addDrawCall() no longer supports indexOffset.' );

			}
			console.warn( 'THREE.BufferGeometry: .addDrawCall() is now .addGroup().' );
			this.addGroup( start, count );

		},
		clearDrawCalls: function () {

			console.warn( 'THREE.BufferGeometry: .clearDrawCalls() is now .clearGroups().' );
			this.clearGroups();

		},
		computeTangents: function () {

			console.warn( 'THREE.BufferGeometry: .computeTangents() has been removed.' );

		},
		computeOffsets: function () {

			console.warn( 'THREE.BufferGeometry: .computeOffsets() has been removed.' );

		},
		removeAttribute: function ( name ) {

			console.warn( 'THREE.BufferGeometry: .removeAttribute() has been renamed to .deleteAttribute().' );

			return this.deleteAttribute( name );

		},
		applyMatrix: function ( matrix ) {

			console.warn( 'THREE.BufferGeometry: .applyMatrix() has been renamed to .applyMatrix4().' );
			return this.applyMatrix4( matrix );

		}

	} );

	Object.defineProperties( BufferGeometry.prototype, {

		drawcalls: {
			get: function () {

				console.error( 'THREE.BufferGeometry: .drawcalls has been renamed to .groups.' );
				return this.groups;

			}
		},
		offsets: {
			get: function () {

				console.warn( 'THREE.BufferGeometry: .offsets has been renamed to .groups.' );
				return this.groups;

			}
		}

	} );

	Object.defineProperties( Raycaster.prototype, {

		linePrecision: {
			get: function () {

				console.warn( 'THREE.Raycaster: .linePrecision has been deprecated. Use .params.Line.threshold instead.' );
				return this.params.Line.threshold;

			},
			set: function ( value ) {

				console.warn( 'THREE.Raycaster: .linePrecision has been deprecated. Use .params.Line.threshold instead.' );
				this.params.Line.threshold = value;

			}
		}

	} );

	Object.defineProperties( InterleavedBuffer.prototype, {

		dynamic: {
			get: function () {

				console.warn( 'THREE.InterleavedBuffer: .length has been deprecated. Use .usage instead.' );
				return this.usage === DynamicDrawUsage;

			},
			set: function ( value ) {

				console.warn( 'THREE.InterleavedBuffer: .length has been deprecated. Use .usage instead.' );
				this.setUsage( value );

			}
		}

	} );

	Object.assign( InterleavedBuffer.prototype, {
		setDynamic: function ( value ) {

			console.warn( 'THREE.InterleavedBuffer: .setDynamic() has been deprecated. Use .setUsage() instead.' );
			this.setUsage( value === true ? DynamicDrawUsage : StaticDrawUsage );
			return this;

		},
		setArray: function ( /* array */ ) {

			console.error( 'THREE.InterleavedBuffer: .setArray has been removed. Use BufferGeometry .setAttribute to replace/resize attribute buffers' );

		}
	} );

	//

	Object.assign( ExtrudeBufferGeometry.prototype, {

		getArrays: function () {

			console.error( 'THREE.ExtrudeBufferGeometry: .getArrays() has been removed.' );

		},

		addShapeList: function () {

			console.error( 'THREE.ExtrudeBufferGeometry: .addShapeList() has been removed.' );

		},

		addShape: function () {

			console.error( 'THREE.ExtrudeBufferGeometry: .addShape() has been removed.' );

		}

	} );

	//

	Object.defineProperties( Uniform.prototype, {

		dynamic: {
			set: function () {

				console.warn( 'THREE.Uniform: .dynamic has been removed. Use object.onBeforeRender() instead.' );

			}
		},
		onUpdate: {
			value: function () {

				console.warn( 'THREE.Uniform: .onUpdate() has been removed. Use object.onBeforeRender() instead.' );
				return this;

			}
		}

	} );

	//

	Object.defineProperties( Material.prototype, {

		wrapAround: {
			get: function () {

				console.warn( 'THREE.Material: .wrapAround has been removed.' );

			},
			set: function () {

				console.warn( 'THREE.Material: .wrapAround has been removed.' );

			}
		},

		overdraw: {
			get: function () {

				console.warn( 'THREE.Material: .overdraw has been removed.' );

			},
			set: function () {

				console.warn( 'THREE.Material: .overdraw has been removed.' );

			}
		},

		wrapRGB: {
			get: function () {

				console.warn( 'THREE.Material: .wrapRGB has been removed.' );
				return new Color();

			}
		},

		shading: {
			get: function () {

				console.error( 'THREE.' + this.type + ': .shading has been removed. Use the boolean .flatShading instead.' );

			},
			set: function ( value ) {

				console.warn( 'THREE.' + this.type + ': .shading has been removed. Use the boolean .flatShading instead.' );
				this.flatShading = ( value === FlatShading );

			}
		},

		stencilMask: {
			get: function () {

				console.warn( 'THREE.' + this.type + ': .stencilMask has been removed. Use .stencilFuncMask instead.' );
				return this.stencilFuncMask;

			},
			set: function ( value ) {

				console.warn( 'THREE.' + this.type + ': .stencilMask has been removed. Use .stencilFuncMask instead.' );
				this.stencilFuncMask = value;

			}
		}

	} );

	Object.defineProperties( MeshPhongMaterial.prototype, {

		metal: {
			get: function () {

				console.warn( 'THREE.MeshPhongMaterial: .metal has been removed. Use THREE.MeshStandardMaterial instead.' );
				return false;

			},
			set: function () {

				console.warn( 'THREE.MeshPhongMaterial: .metal has been removed. Use THREE.MeshStandardMaterial instead' );

			}
		}

	} );

	Object.defineProperties( ShaderMaterial.prototype, {

		derivatives: {
			get: function () {

				console.warn( 'THREE.ShaderMaterial: .derivatives has been moved to .extensions.derivatives.' );
				return this.extensions.derivatives;

			},
			set: function ( value ) {

				console.warn( 'THREE. ShaderMaterial: .derivatives has been moved to .extensions.derivatives.' );
				this.extensions.derivatives = value;

			}
		}

	} );

	//

	Object.assign( WebGLRenderer.prototype, {

		clearTarget: function ( renderTarget, color, depth, stencil ) {

			console.warn( 'THREE.WebGLRenderer: .clearTarget() has been deprecated. Use .setRenderTarget() and .clear() instead.' );
			this.setRenderTarget( renderTarget );
			this.clear( color, depth, stencil );

		},
		animate: function ( callback ) {

			console.warn( 'THREE.WebGLRenderer: .animate() is now .setAnimationLoop().' );
			this.setAnimationLoop( callback );

		},
		getCurrentRenderTarget: function () {

			console.warn( 'THREE.WebGLRenderer: .getCurrentRenderTarget() is now .getRenderTarget().' );
			return this.getRenderTarget();

		},
		getMaxAnisotropy: function () {

			console.warn( 'THREE.WebGLRenderer: .getMaxAnisotropy() is now .capabilities.getMaxAnisotropy().' );
			return this.capabilities.getMaxAnisotropy();

		},
		getPrecision: function () {

			console.warn( 'THREE.WebGLRenderer: .getPrecision() is now .capabilities.precision.' );
			return this.capabilities.precision;

		},
		resetGLState: function () {

			console.warn( 'THREE.WebGLRenderer: .resetGLState() is now .state.reset().' );
			return this.state.reset();

		},
		supportsFloatTextures: function () {

			console.warn( 'THREE.WebGLRenderer: .supportsFloatTextures() is now .extensions.get( \'OES_texture_float\' ).' );
			return this.extensions.get( 'OES_texture_float' );

		},
		supportsHalfFloatTextures: function () {

			console.warn( 'THREE.WebGLRenderer: .supportsHalfFloatTextures() is now .extensions.get( \'OES_texture_half_float\' ).' );
			return this.extensions.get( 'OES_texture_half_float' );

		},
		supportsStandardDerivatives: function () {

			console.warn( 'THREE.WebGLRenderer: .supportsStandardDerivatives() is now .extensions.get( \'OES_standard_derivatives\' ).' );
			return this.extensions.get( 'OES_standard_derivatives' );

		},
		supportsCompressedTextureS3TC: function () {

			console.warn( 'THREE.WebGLRenderer: .supportsCompressedTextureS3TC() is now .extensions.get( \'WEBGL_compressed_texture_s3tc\' ).' );
			return this.extensions.get( 'WEBGL_compressed_texture_s3tc' );

		},
		supportsCompressedTexturePVRTC: function () {

			console.warn( 'THREE.WebGLRenderer: .supportsCompressedTexturePVRTC() is now .extensions.get( \'WEBGL_compressed_texture_pvrtc\' ).' );
			return this.extensions.get( 'WEBGL_compressed_texture_pvrtc' );

		},
		supportsBlendMinMax: function () {

			console.warn( 'THREE.WebGLRenderer: .supportsBlendMinMax() is now .extensions.get( \'EXT_blend_minmax\' ).' );
			return this.extensions.get( 'EXT_blend_minmax' );

		},
		supportsVertexTextures: function () {

			console.warn( 'THREE.WebGLRenderer: .supportsVertexTextures() is now .capabilities.vertexTextures.' );
			return this.capabilities.vertexTextures;

		},
		supportsInstancedArrays: function () {

			console.warn( 'THREE.WebGLRenderer: .supportsInstancedArrays() is now .extensions.get( \'ANGLE_instanced_arrays\' ).' );
			return this.extensions.get( 'ANGLE_instanced_arrays' );

		},
		enableScissorTest: function ( boolean ) {

			console.warn( 'THREE.WebGLRenderer: .enableScissorTest() is now .setScissorTest().' );
			this.setScissorTest( boolean );

		},
		initMaterial: function () {

			console.warn( 'THREE.WebGLRenderer: .initMaterial() has been removed.' );

		},
		addPrePlugin: function () {

			console.warn( 'THREE.WebGLRenderer: .addPrePlugin() has been removed.' );

		},
		addPostPlugin: function () {

			console.warn( 'THREE.WebGLRenderer: .addPostPlugin() has been removed.' );

		},
		updateShadowMap: function () {

			console.warn( 'THREE.WebGLRenderer: .updateShadowMap() has been removed.' );

		},
		setFaceCulling: function () {

			console.warn( 'THREE.WebGLRenderer: .setFaceCulling() has been removed.' );

		},
		allocTextureUnit: function () {

			console.warn( 'THREE.WebGLRenderer: .allocTextureUnit() has been removed.' );

		},
		setTexture: function () {

			console.warn( 'THREE.WebGLRenderer: .setTexture() has been removed.' );

		},
		setTexture2D: function () {

			console.warn( 'THREE.WebGLRenderer: .setTexture2D() has been removed.' );

		},
		setTextureCube: function () {

			console.warn( 'THREE.WebGLRenderer: .setTextureCube() has been removed.' );

		},
		getActiveMipMapLevel: function () {

			console.warn( 'THREE.WebGLRenderer: .getActiveMipMapLevel() is now .getActiveMipmapLevel().' );
			return this.getActiveMipmapLevel();

		}

	} );

	Object.defineProperties( WebGLRenderer.prototype, {

		shadowMapEnabled: {
			get: function () {

				return this.shadowMap.enabled;

			},
			set: function ( value ) {

				console.warn( 'THREE.WebGLRenderer: .shadowMapEnabled is now .shadowMap.enabled.' );
				this.shadowMap.enabled = value;

			}
		},
		shadowMapType: {
			get: function () {

				return this.shadowMap.type;

			},
			set: function ( value ) {

				console.warn( 'THREE.WebGLRenderer: .shadowMapType is now .shadowMap.type.' );
				this.shadowMap.type = value;

			}
		},
		shadowMapCullFace: {
			get: function () {

				console.warn( 'THREE.WebGLRenderer: .shadowMapCullFace has been removed. Set Material.shadowSide instead.' );
				return undefined;

			},
			set: function ( /* value */ ) {

				console.warn( 'THREE.WebGLRenderer: .shadowMapCullFace has been removed. Set Material.shadowSide instead.' );

			}
		},
		context: {
			get: function () {

				console.warn( 'THREE.WebGLRenderer: .context has been removed. Use .getContext() instead.' );
				return this.getContext();

			}
		},
		vr: {
			get: function () {

				console.warn( 'THREE.WebGLRenderer: .vr has been renamed to .xr' );
				return this.xr;

			}
		},
		gammaInput: {
			get: function () {

				console.warn( 'THREE.WebGLRenderer: .gammaInput has been removed. Set the encoding for textures via Texture.encoding instead.' );
				return false;

			},
			set: function () {

				console.warn( 'THREE.WebGLRenderer: .gammaInput has been removed. Set the encoding for textures via Texture.encoding instead.' );

			}
		},
		gammaOutput: {
			get: function () {

				console.warn( 'THREE.WebGLRenderer: .gammaOutput has been removed. Set WebGLRenderer.outputEncoding instead.' );
				return false;

			},
			set: function ( value ) {

				console.warn( 'THREE.WebGLRenderer: .gammaOutput has been removed. Set WebGLRenderer.outputEncoding instead.' );
				this.outputEncoding = ( value === true ) ? sRGBEncoding : LinearEncoding;

			}
		}

	} );

	Object.defineProperties( WebGLShadowMap.prototype, {

		cullFace: {
			get: function () {

				console.warn( 'THREE.WebGLRenderer: .shadowMap.cullFace has been removed. Set Material.shadowSide instead.' );
				return undefined;

			},
			set: function ( /* cullFace */ ) {

				console.warn( 'THREE.WebGLRenderer: .shadowMap.cullFace has been removed. Set Material.shadowSide instead.' );

			}
		},
		renderReverseSided: {
			get: function () {

				console.warn( 'THREE.WebGLRenderer: .shadowMap.renderReverseSided has been removed. Set Material.shadowSide instead.' );
				return undefined;

			},
			set: function () {

				console.warn( 'THREE.WebGLRenderer: .shadowMap.renderReverseSided has been removed. Set Material.shadowSide instead.' );

			}
		},
		renderSingleSided: {
			get: function () {

				console.warn( 'THREE.WebGLRenderer: .shadowMap.renderSingleSided has been removed. Set Material.shadowSide instead.' );
				return undefined;

			},
			set: function () {

				console.warn( 'THREE.WebGLRenderer: .shadowMap.renderSingleSided has been removed. Set Material.shadowSide instead.' );

			}
		}

	} );

	function WebGLRenderTargetCube( width, height, options ) {

		console.warn( 'THREE.WebGLRenderTargetCube( width, height, options ) is now WebGLCubeRenderTarget( size, options ).' );
		return new WebGLCubeRenderTarget( width, options );

	}

	//

	Object.defineProperties( WebGLRenderTarget.prototype, {

		wrapS: {
			get: function () {

				console.warn( 'THREE.WebGLRenderTarget: .wrapS is now .texture.wrapS.' );
				return this.texture.wrapS;

			},
			set: function ( value ) {

				console.warn( 'THREE.WebGLRenderTarget: .wrapS is now .texture.wrapS.' );
				this.texture.wrapS = value;

			}
		},
		wrapT: {
			get: function () {

				console.warn( 'THREE.WebGLRenderTarget: .wrapT is now .texture.wrapT.' );
				return this.texture.wrapT;

			},
			set: function ( value ) {

				console.warn( 'THREE.WebGLRenderTarget: .wrapT is now .texture.wrapT.' );
				this.texture.wrapT = value;

			}
		},
		magFilter: {
			get: function () {

				console.warn( 'THREE.WebGLRenderTarget: .magFilter is now .texture.magFilter.' );
				return this.texture.magFilter;

			},
			set: function ( value ) {

				console.warn( 'THREE.WebGLRenderTarget: .magFilter is now .texture.magFilter.' );
				this.texture.magFilter = value;

			}
		},
		minFilter: {
			get: function () {

				console.warn( 'THREE.WebGLRenderTarget: .minFilter is now .texture.minFilter.' );
				return this.texture.minFilter;

			},
			set: function ( value ) {

				console.warn( 'THREE.WebGLRenderTarget: .minFilter is now .texture.minFilter.' );
				this.texture.minFilter = value;

			}
		},
		anisotropy: {
			get: function () {

				console.warn( 'THREE.WebGLRenderTarget: .anisotropy is now .texture.anisotropy.' );
				return this.texture.anisotropy;

			},
			set: function ( value ) {

				console.warn( 'THREE.WebGLRenderTarget: .anisotropy is now .texture.anisotropy.' );
				this.texture.anisotropy = value;

			}
		},
		offset: {
			get: function () {

				console.warn( 'THREE.WebGLRenderTarget: .offset is now .texture.offset.' );
				return this.texture.offset;

			},
			set: function ( value ) {

				console.warn( 'THREE.WebGLRenderTarget: .offset is now .texture.offset.' );
				this.texture.offset = value;

			}
		},
		repeat: {
			get: function () {

				console.warn( 'THREE.WebGLRenderTarget: .repeat is now .texture.repeat.' );
				return this.texture.repeat;

			},
			set: function ( value ) {

				console.warn( 'THREE.WebGLRenderTarget: .repeat is now .texture.repeat.' );
				this.texture.repeat = value;

			}
		},
		format: {
			get: function () {

				console.warn( 'THREE.WebGLRenderTarget: .format is now .texture.format.' );
				return this.texture.format;

			},
			set: function ( value ) {

				console.warn( 'THREE.WebGLRenderTarget: .format is now .texture.format.' );
				this.texture.format = value;

			}
		},
		type: {
			get: function () {

				console.warn( 'THREE.WebGLRenderTarget: .type is now .texture.type.' );
				return this.texture.type;

			},
			set: function ( value ) {

				console.warn( 'THREE.WebGLRenderTarget: .type is now .texture.type.' );
				this.texture.type = value;

			}
		},
		generateMipmaps: {
			get: function () {

				console.warn( 'THREE.WebGLRenderTarget: .generateMipmaps is now .texture.generateMipmaps.' );
				return this.texture.generateMipmaps;

			},
			set: function ( value ) {

				console.warn( 'THREE.WebGLRenderTarget: .generateMipmaps is now .texture.generateMipmaps.' );
				this.texture.generateMipmaps = value;

			}
		}

	} );

	//

	Object.defineProperties( Audio.prototype, {

		load: {
			value: function ( file ) {

				console.warn( 'THREE.Audio: .load has been deprecated. Use THREE.AudioLoader instead.' );
				var scope = this;
				var audioLoader = new AudioLoader();
				audioLoader.load( file, function ( buffer ) {

					scope.setBuffer( buffer );

				} );
				return this;

			}
		},
		startTime: {
			set: function () {

				console.warn( 'THREE.Audio: .startTime is now .play( delay ).' );

			}
		}

	} );

	AudioAnalyser.prototype.getData = function () {

		console.warn( 'THREE.AudioAnalyser: .getData() is now .getFrequencyData().' );
		return this.getFrequencyData();

	};

	//

	CubeCamera.prototype.updateCubeMap = function ( renderer, scene ) {

		console.warn( 'THREE.CubeCamera: .updateCubeMap() is now .update().' );
		return this.update( renderer, scene );

	};

	//

	var GeometryUtils = {

		merge: function ( geometry1, geometry2, materialIndexOffset ) {

			console.warn( 'THREE.GeometryUtils: .merge() has been moved to Geometry. Use geometry.merge( geometry2, matrix, materialIndexOffset ) instead.' );
			var matrix;

			if ( geometry2.isMesh ) {

				geometry2.matrixAutoUpdate && geometry2.updateMatrix();

				matrix = geometry2.matrix;
				geometry2 = geometry2.geometry;

			}

			geometry1.merge( geometry2, matrix, materialIndexOffset );

		},

		center: function ( geometry ) {

			console.warn( 'THREE.GeometryUtils: .center() has been moved to Geometry. Use geometry.center() instead.' );
			return geometry.center();

		}

	};

	ImageUtils.crossOrigin = undefined;

	ImageUtils.loadTexture = function ( url, mapping, onLoad, onError ) {

		console.warn( 'THREE.ImageUtils.loadTexture has been deprecated. Use THREE.TextureLoader() instead.' );

		var loader = new TextureLoader();
		loader.setCrossOrigin( this.crossOrigin );

		var texture = loader.load( url, onLoad, undefined, onError );

		if ( mapping ) { texture.mapping = mapping; }

		return texture;

	};

	ImageUtils.loadTextureCube = function ( urls, mapping, onLoad, onError ) {

		console.warn( 'THREE.ImageUtils.loadTextureCube has been deprecated. Use THREE.CubeTextureLoader() instead.' );

		var loader = new CubeTextureLoader();
		loader.setCrossOrigin( this.crossOrigin );

		var texture = loader.load( urls, onLoad, undefined, onError );

		if ( mapping ) { texture.mapping = mapping; }

		return texture;

	};

	ImageUtils.loadCompressedTexture = function () {

		console.error( 'THREE.ImageUtils.loadCompressedTexture has been removed. Use THREE.DDSLoader instead.' );

	};

	ImageUtils.loadCompressedTextureCube = function () {

		console.error( 'THREE.ImageUtils.loadCompressedTextureCube has been removed. Use THREE.DDSLoader instead.' );

	};

	//

	function CanvasRenderer() {

		console.error( 'THREE.CanvasRenderer has been removed' );

	}

	//

	function JSONLoader() {

		console.error( 'THREE.JSONLoader has been removed.' );

	}

	//

	var SceneUtils = {

		createMultiMaterialObject: function ( /* geometry, materials */ ) {

			console.error( 'THREE.SceneUtils has been moved to /examples/js/utils/SceneUtils.js' );

		},

		detach: function ( /* child, parent, scene */ ) {

			console.error( 'THREE.SceneUtils has been moved to /examples/js/utils/SceneUtils.js' );

		},

		attach: function ( /* child, scene, parent */ ) {

			console.error( 'THREE.SceneUtils has been moved to /examples/js/utils/SceneUtils.js' );

		}

	};

	//

	function LensFlare() {

		console.error( 'THREE.LensFlare has been moved to /examples/js/objects/Lensflare.js' );

	}

	if ( typeof __THREE_DEVTOOLS__ !== 'undefined' ) {

		/* eslint-disable no-undef */
		__THREE_DEVTOOLS__.dispatchEvent( new CustomEvent( 'register', { detail: {
			revision: REVISION,
		} } ) );
		/* eslint-enable no-undef */

	}

	exports.ACESFilmicToneMapping = ACESFilmicToneMapping;
	exports.AddEquation = AddEquation;
	exports.AddOperation = AddOperation;
	exports.AdditiveBlending = AdditiveBlending;
	exports.AlphaFormat = AlphaFormat;
	exports.AlwaysDepth = AlwaysDepth;
	exports.AlwaysStencilFunc = AlwaysStencilFunc;
	exports.AmbientLight = AmbientLight;
	exports.AmbientLightProbe = AmbientLightProbe;
	exports.AnimationClip = AnimationClip;
	exports.AnimationLoader = AnimationLoader;
	exports.AnimationMixer = AnimationMixer;
	exports.AnimationObjectGroup = AnimationObjectGroup;
	exports.AnimationUtils = AnimationUtils;
	exports.ArcCurve = ArcCurve;
	exports.ArrayCamera = ArrayCamera;
	exports.ArrowHelper = ArrowHelper;
	exports.Audio = Audio;
	exports.AudioAnalyser = AudioAnalyser;
	exports.AudioContext = AudioContext;
	exports.AudioListener = AudioListener;
	exports.AudioLoader = AudioLoader;
	exports.AxesHelper = AxesHelper;
	exports.AxisHelper = AxisHelper;
	exports.BackSide = BackSide;
	exports.BasicDepthPacking = BasicDepthPacking;
	exports.BasicShadowMap = BasicShadowMap;
	exports.BinaryTextureLoader = BinaryTextureLoader;
	exports.Bone = Bone;
	exports.BooleanKeyframeTrack = BooleanKeyframeTrack;
	exports.BoundingBoxHelper = BoundingBoxHelper;
	exports.Box2 = Box2;
	exports.Box3 = Box3;
	exports.Box3Helper = Box3Helper;
	exports.BoxBufferGeometry = BoxBufferGeometry;
	exports.BoxGeometry = BoxGeometry;
	exports.BoxHelper = BoxHelper;
	exports.BufferAttribute = BufferAttribute;
	exports.BufferGeometry = BufferGeometry;
	exports.BufferGeometryLoader = BufferGeometryLoader;
	exports.ByteType = ByteType;
	exports.Cache = Cache;
	exports.Camera = Camera;
	exports.CameraHelper = CameraHelper;
	exports.CanvasRenderer = CanvasRenderer;
	exports.CanvasTexture = CanvasTexture;
	exports.CatmullRomCurve3 = CatmullRomCurve3;
	exports.CineonToneMapping = CineonToneMapping;
	exports.CircleBufferGeometry = CircleBufferGeometry;
	exports.CircleGeometry = CircleGeometry;
	exports.ClampToEdgeWrapping = ClampToEdgeWrapping;
	exports.Clock = Clock;
	exports.ClosedSplineCurve3 = ClosedSplineCurve3;
	exports.Color = Color;
	exports.ColorKeyframeTrack = ColorKeyframeTrack;
	exports.CompressedTexture = CompressedTexture;
	exports.CompressedTextureLoader = CompressedTextureLoader;
	exports.ConeBufferGeometry = ConeBufferGeometry;
	exports.ConeGeometry = ConeGeometry;
	exports.CubeCamera = CubeCamera;
	exports.CubeGeometry = BoxGeometry;
	exports.CubeReflectionMapping = CubeReflectionMapping;
	exports.CubeRefractionMapping = CubeRefractionMapping;
	exports.CubeTexture = CubeTexture;
	exports.CubeTextureLoader = CubeTextureLoader;
	exports.CubeUVReflectionMapping = CubeUVReflectionMapping;
	exports.CubeUVRefractionMapping = CubeUVRefractionMapping;
	exports.CubicBezierCurve = CubicBezierCurve;
	exports.CubicBezierCurve3 = CubicBezierCurve3;
	exports.CubicInterpolant = CubicInterpolant;
	exports.CullFaceBack = CullFaceBack;
	exports.CullFaceFront = CullFaceFront;
	exports.CullFaceFrontBack = CullFaceFrontBack;
	exports.CullFaceNone = CullFaceNone;
	exports.Curve = Curve;
	exports.CurvePath = CurvePath;
	exports.CustomBlending = CustomBlending;
	exports.CylinderBufferGeometry = CylinderBufferGeometry;
	exports.CylinderGeometry = CylinderGeometry;
	exports.Cylindrical = Cylindrical;
	exports.DataTexture = DataTexture;
	exports.DataTexture2DArray = DataTexture2DArray;
	exports.DataTexture3D = DataTexture3D;
	exports.DataTextureLoader = DataTextureLoader;
	exports.DecrementStencilOp = DecrementStencilOp;
	exports.DecrementWrapStencilOp = DecrementWrapStencilOp;
	exports.DefaultLoadingManager = DefaultLoadingManager;
	exports.DepthFormat = DepthFormat;
	exports.DepthStencilFormat = DepthStencilFormat;
	exports.DepthTexture = DepthTexture;
	exports.DirectionalLight = DirectionalLight;
	exports.DirectionalLightHelper = DirectionalLightHelper;
	exports.DirectionalLightShadow = DirectionalLightShadow;
	exports.DiscreteInterpolant = DiscreteInterpolant;
	exports.DodecahedronBufferGeometry = DodecahedronBufferGeometry;
	exports.DodecahedronGeometry = DodecahedronGeometry;
	exports.DoubleSide = DoubleSide;
	exports.DstAlphaFactor = DstAlphaFactor;
	exports.DstColorFactor = DstColorFactor;
	exports.DynamicBufferAttribute = DynamicBufferAttribute;
	exports.DynamicCopyUsage = DynamicCopyUsage;
	exports.DynamicDrawUsage = DynamicDrawUsage;
	exports.DynamicReadUsage = DynamicReadUsage;
	exports.EdgesGeometry = EdgesGeometry;
	exports.EdgesHelper = EdgesHelper;
	exports.EllipseCurve = EllipseCurve;
	exports.EqualDepth = EqualDepth;
	exports.EqualStencilFunc = EqualStencilFunc;
	exports.EquirectangularReflectionMapping = EquirectangularReflectionMapping;
	exports.EquirectangularRefractionMapping = EquirectangularRefractionMapping;
	exports.Euler = Euler;
	exports.EventDispatcher = EventDispatcher;
	exports.ExtrudeBufferGeometry = ExtrudeBufferGeometry;
	exports.ExtrudeGeometry = ExtrudeGeometry;
	exports.Face3 = Face3;
	exports.Face4 = Face4;
	exports.FaceColors = FaceColors;
	exports.FileLoader = FileLoader;
	exports.FlatShading = FlatShading;
	exports.Float32Attribute = Float32Attribute;
	exports.Float32BufferAttribute = Float32BufferAttribute;
	exports.Float64Attribute = Float64Attribute;
	exports.Float64BufferAttribute = Float64BufferAttribute;
	exports.FloatType = FloatType;
	exports.Fog = Fog;
	exports.FogExp2 = FogExp2;
	exports.Font = Font;
	exports.FontLoader = FontLoader;
	exports.FrontFaceDirectionCCW = FrontFaceDirectionCCW;
	exports.FrontFaceDirectionCW = FrontFaceDirectionCW;
	exports.FrontSide = FrontSide;
	exports.Frustum = Frustum;
	exports.GammaEncoding = GammaEncoding;
	exports.Geometry = Geometry;
	exports.GeometryUtils = GeometryUtils;
	exports.GreaterDepth = GreaterDepth;
	exports.GreaterEqualDepth = GreaterEqualDepth;
	exports.GreaterEqualStencilFunc = GreaterEqualStencilFunc;
	exports.GreaterStencilFunc = GreaterStencilFunc;
	exports.GridHelper = GridHelper;
	exports.Group = Group;
	exports.HalfFloatType = HalfFloatType;
	exports.HemisphereLight = HemisphereLight;
	exports.HemisphereLightHelper = HemisphereLightHelper;
	exports.HemisphereLightProbe = HemisphereLightProbe;
	exports.IcosahedronBufferGeometry = IcosahedronBufferGeometry;
	exports.IcosahedronGeometry = IcosahedronGeometry;
	exports.ImageBitmapLoader = ImageBitmapLoader;
	exports.ImageLoader = ImageLoader;
	exports.ImageUtils = ImageUtils;
	exports.ImmediateRenderObject = ImmediateRenderObject;
	exports.IncrementStencilOp = IncrementStencilOp;
	exports.IncrementWrapStencilOp = IncrementWrapStencilOp;
	exports.InstancedBufferAttribute = InstancedBufferAttribute;
	exports.InstancedBufferGeometry = InstancedBufferGeometry;
	exports.InstancedInterleavedBuffer = InstancedInterleavedBuffer;
	exports.InstancedMesh = InstancedMesh;
	exports.Int16Attribute = Int16Attribute;
	exports.Int16BufferAttribute = Int16BufferAttribute;
	exports.Int32Attribute = Int32Attribute;
	exports.Int32BufferAttribute = Int32BufferAttribute;
	exports.Int8Attribute = Int8Attribute;
	exports.Int8BufferAttribute = Int8BufferAttribute;
	exports.IntType = IntType;
	exports.InterleavedBuffer = InterleavedBuffer;
	exports.InterleavedBufferAttribute = InterleavedBufferAttribute;
	exports.Interpolant = Interpolant;
	exports.InterpolateDiscrete = InterpolateDiscrete;
	exports.InterpolateLinear = InterpolateLinear;
	exports.InterpolateSmooth = InterpolateSmooth;
	exports.InvertStencilOp = InvertStencilOp;
	exports.JSONLoader = JSONLoader;
	exports.KeepStencilOp = KeepStencilOp;
	exports.KeyframeTrack = KeyframeTrack;
	exports.LOD = LOD;
	exports.LatheBufferGeometry = LatheBufferGeometry;
	exports.LatheGeometry = LatheGeometry;
	exports.Layers = Layers;
	exports.LensFlare = LensFlare;
	exports.LessDepth = LessDepth;
	exports.LessEqualDepth = LessEqualDepth;
	exports.LessEqualStencilFunc = LessEqualStencilFunc;
	exports.LessStencilFunc = LessStencilFunc;
	exports.Light = Light;
	exports.LightProbe = LightProbe;
	exports.LightShadow = LightShadow;
	exports.Line = Line;
	exports.Line3 = Line3;
	exports.LineBasicMaterial = LineBasicMaterial;
	exports.LineCurve = LineCurve;
	exports.LineCurve3 = LineCurve3;
	exports.LineDashedMaterial = LineDashedMaterial;
	exports.LineLoop = LineLoop;
	exports.LinePieces = LinePieces;
	exports.LineSegments = LineSegments;
	exports.LineStrip = LineStrip;
	exports.LinearEncoding = LinearEncoding;
	exports.LinearFilter = LinearFilter;
	exports.LinearInterpolant = LinearInterpolant;
	exports.LinearMipMapLinearFilter = LinearMipMapLinearFilter;
	exports.LinearMipMapNearestFilter = LinearMipMapNearestFilter;
	exports.LinearMipmapLinearFilter = LinearMipmapLinearFilter;
	exports.LinearMipmapNearestFilter = LinearMipmapNearestFilter;
	exports.LinearToneMapping = LinearToneMapping;
	exports.Loader = Loader;
	exports.LoaderUtils = LoaderUtils;
	exports.LoadingManager = LoadingManager;
	exports.LogLuvEncoding = LogLuvEncoding;
	exports.LoopOnce = LoopOnce;
	exports.LoopPingPong = LoopPingPong;
	exports.LoopRepeat = LoopRepeat;
	exports.LuminanceAlphaFormat = LuminanceAlphaFormat;
	exports.LuminanceFormat = LuminanceFormat;
	exports.MOUSE = MOUSE;
	exports.Material = Material;
	exports.MaterialLoader = MaterialLoader;
	exports.Math = MathUtils;
	exports.MathUtils = MathUtils;
	exports.Matrix3 = Matrix3;
	exports.Matrix4 = Matrix4;
	exports.MaxEquation = MaxEquation;
	exports.Mesh = Mesh;
	exports.MeshBasicMaterial = MeshBasicMaterial;
	exports.MeshDepthMaterial = MeshDepthMaterial;
	exports.MeshDistanceMaterial = MeshDistanceMaterial;
	exports.MeshFaceMaterial = MeshFaceMaterial;
	exports.MeshLambertMaterial = MeshLambertMaterial;
	exports.MeshMatcapMaterial = MeshMatcapMaterial;
	exports.MeshNormalMaterial = MeshNormalMaterial;
	exports.MeshPhongMaterial = MeshPhongMaterial;
	exports.MeshPhysicalMaterial = MeshPhysicalMaterial;
	exports.MeshStandardMaterial = MeshStandardMaterial;
	exports.MeshToonMaterial = MeshToonMaterial;
	exports.MinEquation = MinEquation;
	exports.MirroredRepeatWrapping = MirroredRepeatWrapping;
	exports.MixOperation = MixOperation;
	exports.MultiMaterial = MultiMaterial;
	exports.MultiplyBlending = MultiplyBlending;
	exports.MultiplyOperation = MultiplyOperation;
	exports.NearestFilter = NearestFilter;
	exports.NearestMipMapLinearFilter = NearestMipMapLinearFilter;
	exports.NearestMipMapNearestFilter = NearestMipMapNearestFilter;
	exports.NearestMipmapLinearFilter = NearestMipmapLinearFilter;
	exports.NearestMipmapNearestFilter = NearestMipmapNearestFilter;
	exports.NeverDepth = NeverDepth;
	exports.NeverStencilFunc = NeverStencilFunc;
	exports.NoBlending = NoBlending;
	exports.NoColors = NoColors;
	exports.NoToneMapping = NoToneMapping;
	exports.NormalBlending = NormalBlending;
	exports.NotEqualDepth = NotEqualDepth;
	exports.NotEqualStencilFunc = NotEqualStencilFunc;
	exports.NumberKeyframeTrack = NumberKeyframeTrack;
	exports.Object3D = Object3D;
	exports.ObjectLoader = ObjectLoader;
	exports.ObjectSpaceNormalMap = ObjectSpaceNormalMap;
	exports.OctahedronBufferGeometry = OctahedronBufferGeometry;
	exports.OctahedronGeometry = OctahedronGeometry;
	exports.OneFactor = OneFactor;
	exports.OneMinusDstAlphaFactor = OneMinusDstAlphaFactor;
	exports.OneMinusDstColorFactor = OneMinusDstColorFactor;
	exports.OneMinusSrcAlphaFactor = OneMinusSrcAlphaFactor;
	exports.OneMinusSrcColorFactor = OneMinusSrcColorFactor;
	exports.OrthographicCamera = OrthographicCamera;
	exports.PCFShadowMap = PCFShadowMap;
	exports.PCFSoftShadowMap = PCFSoftShadowMap;
	exports.PMREMGenerator = PMREMGenerator;
	exports.ParametricBufferGeometry = ParametricBufferGeometry;
	exports.ParametricGeometry = ParametricGeometry;
	exports.Particle = Particle;
	exports.ParticleBasicMaterial = ParticleBasicMaterial;
	exports.ParticleSystem = ParticleSystem;
	exports.ParticleSystemMaterial = ParticleSystemMaterial;
	exports.Path = Path;
	exports.PerspectiveCamera = PerspectiveCamera;
	exports.Plane = Plane;
	exports.PlaneBufferGeometry = PlaneBufferGeometry;
	exports.PlaneGeometry = PlaneGeometry;
	exports.PlaneHelper = PlaneHelper;
	exports.PointCloud = PointCloud;
	exports.PointCloudMaterial = PointCloudMaterial;
	exports.PointLight = PointLight;
	exports.PointLightHelper = PointLightHelper;
	exports.Points = Points;
	exports.PointsMaterial = PointsMaterial;
	exports.PolarGridHelper = PolarGridHelper;
	exports.PolyhedronBufferGeometry = PolyhedronBufferGeometry;
	exports.PolyhedronGeometry = PolyhedronGeometry;
	exports.PositionalAudio = PositionalAudio;
	exports.PropertyBinding = PropertyBinding;
	exports.PropertyMixer = PropertyMixer;
	exports.QuadraticBezierCurve = QuadraticBezierCurve;
	exports.QuadraticBezierCurve3 = QuadraticBezierCurve3;
	exports.Quaternion = Quaternion;
	exports.QuaternionKeyframeTrack = QuaternionKeyframeTrack;
	exports.QuaternionLinearInterpolant = QuaternionLinearInterpolant;
	exports.REVISION = REVISION;
	exports.RGBADepthPacking = RGBADepthPacking;
	exports.RGBAFormat = RGBAFormat;
	exports.RGBAIntegerFormat = RGBAIntegerFormat;
	exports.RGBA_ASTC_10x10_Format = RGBA_ASTC_10x10_Format;
	exports.RGBA_ASTC_10x5_Format = RGBA_ASTC_10x5_Format;
	exports.RGBA_ASTC_10x6_Format = RGBA_ASTC_10x6_Format;
	exports.RGBA_ASTC_10x8_Format = RGBA_ASTC_10x8_Format;
	exports.RGBA_ASTC_12x10_Format = RGBA_ASTC_12x10_Format;
	exports.RGBA_ASTC_12x12_Format = RGBA_ASTC_12x12_Format;
	exports.RGBA_ASTC_4x4_Format = RGBA_ASTC_4x4_Format;
	exports.RGBA_ASTC_5x4_Format = RGBA_ASTC_5x4_Format;
	exports.RGBA_ASTC_5x5_Format = RGBA_ASTC_5x5_Format;
	exports.RGBA_ASTC_6x5_Format = RGBA_ASTC_6x5_Format;
	exports.RGBA_ASTC_6x6_Format = RGBA_ASTC_6x6_Format;
	exports.RGBA_ASTC_8x5_Format = RGBA_ASTC_8x5_Format;
	exports.RGBA_ASTC_8x6_Format = RGBA_ASTC_8x6_Format;
	exports.RGBA_ASTC_8x8_Format = RGBA_ASTC_8x8_Format;
	exports.RGBA_ETC2_EAC_Format = RGBA_ETC2_EAC_Format;
	exports.RGBA_PVRTC_2BPPV1_Format = RGBA_PVRTC_2BPPV1_Format;
	exports.RGBA_PVRTC_4BPPV1_Format = RGBA_PVRTC_4BPPV1_Format;
	exports.RGBA_S3TC_DXT1_Format = RGBA_S3TC_DXT1_Format;
	exports.RGBA_S3TC_DXT3_Format = RGBA_S3TC_DXT3_Format;
	exports.RGBA_S3TC_DXT5_Format = RGBA_S3TC_DXT5_Format;
	exports.RGBDEncoding = RGBDEncoding;
	exports.RGBEEncoding = RGBEEncoding;
	exports.RGBEFormat = RGBEFormat;
	exports.RGBFormat = RGBFormat;
	exports.RGBIntegerFormat = RGBIntegerFormat;
	exports.RGBM16Encoding = RGBM16Encoding;
	exports.RGBM7Encoding = RGBM7Encoding;
	exports.RGB_ETC1_Format = RGB_ETC1_Format;
	exports.RGB_ETC2_Format = RGB_ETC2_Format;
	exports.RGB_PVRTC_2BPPV1_Format = RGB_PVRTC_2BPPV1_Format;
	exports.RGB_PVRTC_4BPPV1_Format = RGB_PVRTC_4BPPV1_Format;
	exports.RGB_S3TC_DXT1_Format = RGB_S3TC_DXT1_Format;
	exports.RGFormat = RGFormat;
	exports.RGIntegerFormat = RGIntegerFormat;
	exports.RawShaderMaterial = RawShaderMaterial;
	exports.Ray = Ray;
	exports.Raycaster = Raycaster;
	exports.RectAreaLight = RectAreaLight;
	exports.RedFormat = RedFormat;
	exports.RedIntegerFormat = RedIntegerFormat;
	exports.ReinhardToneMapping = ReinhardToneMapping;
	exports.RepeatWrapping = RepeatWrapping;
	exports.ReplaceStencilOp = ReplaceStencilOp;
	exports.ReverseSubtractEquation = ReverseSubtractEquation;
	exports.RingBufferGeometry = RingBufferGeometry;
	exports.RingGeometry = RingGeometry;
	exports.Scene = Scene;
	exports.SceneUtils = SceneUtils;
	exports.ShaderChunk = ShaderChunk;
	exports.ShaderLib = ShaderLib;
	exports.ShaderMaterial = ShaderMaterial;
	exports.ShadowMaterial = ShadowMaterial;
	exports.Shape = Shape;
	exports.ShapeBufferGeometry = ShapeBufferGeometry;
	exports.ShapeGeometry = ShapeGeometry;
	exports.ShapePath = ShapePath;
	exports.ShapeUtils = ShapeUtils;
	exports.ShortType = ShortType;
	exports.Skeleton = Skeleton;
	exports.SkeletonHelper = SkeletonHelper;
	exports.SkinnedMesh = SkinnedMesh;
	exports.SmoothShading = SmoothShading;
	exports.Sphere = Sphere;
	exports.SphereBufferGeometry = SphereBufferGeometry;
	exports.SphereGeometry = SphereGeometry;
	exports.Spherical = Spherical;
	exports.SphericalHarmonics3 = SphericalHarmonics3;
	exports.SphericalReflectionMapping = SphericalReflectionMapping;
	exports.Spline = Spline;
	exports.SplineCurve = SplineCurve;
	exports.SplineCurve3 = SplineCurve3;
	exports.SpotLight = SpotLight;
	exports.SpotLightHelper = SpotLightHelper;
	exports.SpotLightShadow = SpotLightShadow;
	exports.Sprite = Sprite;
	exports.SpriteMaterial = SpriteMaterial;
	exports.SrcAlphaFactor = SrcAlphaFactor;
	exports.SrcAlphaSaturateFactor = SrcAlphaSaturateFactor;
	exports.SrcColorFactor = SrcColorFactor;
	exports.StaticCopyUsage = StaticCopyUsage;
	exports.StaticDrawUsage = StaticDrawUsage;
	exports.StaticReadUsage = StaticReadUsage;
	exports.StereoCamera = StereoCamera;
	exports.StreamCopyUsage = StreamCopyUsage;
	exports.StreamDrawUsage = StreamDrawUsage;
	exports.StreamReadUsage = StreamReadUsage;
	exports.StringKeyframeTrack = StringKeyframeTrack;
	exports.SubtractEquation = SubtractEquation;
	exports.SubtractiveBlending = SubtractiveBlending;
	exports.TOUCH = TOUCH;
	exports.TangentSpaceNormalMap = TangentSpaceNormalMap;
	exports.TetrahedronBufferGeometry = TetrahedronBufferGeometry;
	exports.TetrahedronGeometry = TetrahedronGeometry;
	exports.TextBufferGeometry = TextBufferGeometry;
	exports.TextGeometry = TextGeometry;
	exports.Texture = Texture;
	exports.TextureLoader = TextureLoader;
	exports.TorusBufferGeometry = TorusBufferGeometry;
	exports.TorusGeometry = TorusGeometry;
	exports.TorusKnotBufferGeometry = TorusKnotBufferGeometry;
	exports.TorusKnotGeometry = TorusKnotGeometry;
	exports.Triangle = Triangle;
	exports.TriangleFanDrawMode = TriangleFanDrawMode;
	exports.TriangleStripDrawMode = TriangleStripDrawMode;
	exports.TrianglesDrawMode = TrianglesDrawMode;
	exports.TubeBufferGeometry = TubeBufferGeometry;
	exports.TubeGeometry = TubeGeometry;
	exports.UVMapping = UVMapping;
	exports.Uint16Attribute = Uint16Attribute;
	exports.Uint16BufferAttribute = Uint16BufferAttribute;
	exports.Uint32Attribute = Uint32Attribute;
	exports.Uint32BufferAttribute = Uint32BufferAttribute;
	exports.Uint8Attribute = Uint8Attribute;
	exports.Uint8BufferAttribute = Uint8BufferAttribute;
	exports.Uint8ClampedAttribute = Uint8ClampedAttribute;
	exports.Uint8ClampedBufferAttribute = Uint8ClampedBufferAttribute;
	exports.Uncharted2ToneMapping = Uncharted2ToneMapping;
	exports.Uniform = Uniform;
	exports.UniformsLib = UniformsLib;
	exports.UniformsUtils = UniformsUtils;
	exports.UnsignedByteType = UnsignedByteType;
	exports.UnsignedInt248Type = UnsignedInt248Type;
	exports.UnsignedIntType = UnsignedIntType;
	exports.UnsignedShort4444Type = UnsignedShort4444Type;
	exports.UnsignedShort5551Type = UnsignedShort5551Type;
	exports.UnsignedShort565Type = UnsignedShort565Type;
	exports.UnsignedShortType = UnsignedShortType;
	exports.VSMShadowMap = VSMShadowMap;
	exports.Vector2 = Vector2;
	exports.Vector3 = Vector3;
	exports.Vector4 = Vector4;
	exports.VectorKeyframeTrack = VectorKeyframeTrack;
	exports.Vertex = Vertex;
	exports.VertexColors = VertexColors;
	exports.VideoTexture = VideoTexture;
	exports.WebGLCubeRenderTarget = WebGLCubeRenderTarget;
	exports.WebGLMultisampleRenderTarget = WebGLMultisampleRenderTarget;
	exports.WebGLRenderTarget = WebGLRenderTarget;
	exports.WebGLRenderTargetCube = WebGLRenderTargetCube;
	exports.WebGLRenderer = WebGLRenderer;
	exports.WebGLUtils = WebGLUtils;
	exports.WireframeGeometry = WireframeGeometry;
	exports.WireframeHelper = WireframeHelper;
	exports.WrapAroundEnding = WrapAroundEnding;
	exports.XHRLoader = XHRLoader;
	exports.ZeroCurvatureEnding = ZeroCurvatureEnding;
	exports.ZeroFactor = ZeroFactor;
	exports.ZeroSlopeEnding = ZeroSlopeEnding;
	exports.ZeroStencilOp = ZeroStencilOp;
	exports.sRGBEncoding = sRGBEncoding;

	Object.defineProperty(exports, '__esModule', { value: true });

})));