three.js/src/renderers/WebGLRenderer.js

/**
 * @author supereggbert / http://www.paulbrunt.co.uk/
 * @author mrdoob / http://mrdoob.com/
 * @author alteredq / http://alteredqualia.com/
 * @author szimek / https://github.com/szimek/
 */

THREE.WebGLRenderer = function ( parameters ) {

	console.log( 'THREE.WebGLRenderer', THREE.REVISION );

	parameters = parameters || {};

	var _canvas = parameters.canvas !== undefined ? parameters.canvas : document.createElement( 'canvas' ),

	_precision = parameters.precision !== undefined ? parameters.precision : 'highp',

	_alpha = parameters.alpha !== undefined ? parameters.alpha : true,
	_premultipliedAlpha = parameters.premultipliedAlpha !== undefined ? parameters.premultipliedAlpha : true,
	_antialias = parameters.antialias !== undefined ? parameters.antialias : false,
	_stencil = parameters.stencil !== undefined ? parameters.stencil : true,
	_preserveDrawingBuffer = parameters.preserveDrawingBuffer !== undefined ? parameters.preserveDrawingBuffer : false,

	_clearColor = parameters.clearColor !== undefined ? new THREE.Color( parameters.clearColor ) : new THREE.Color( 0x000000 ),
	_clearAlpha = parameters.clearAlpha !== undefined ? parameters.clearAlpha : 0,

	_maxLights = parameters.maxLights !== undefined ? parameters.maxLights : 4;

	// public properties

	this.domElement = _canvas;
	this.context = null;

	// clearing

	this.autoClear = true;
	this.autoClearColor = true;
	this.autoClearDepth = true;
	this.autoClearStencil = true;

	// scene graph

	this.sortObjects = true;

	this.autoUpdateObjects = true;
	this.autoUpdateScene = true;

	// physically based shading

	this.gammaInput = false;
	this.gammaOutput = false;
	this.physicallyBasedShading = false;

	// shadow map

	this.shadowMapEnabled = false;
	this.shadowMapAutoUpdate = true;
	this.shadowMapSoft = true;
	this.shadowMapCullFrontFaces = true;
	this.shadowMapDebug = false;
	this.shadowMapCascade = false;

	// morphs

	this.maxMorphTargets = 8;
	this.maxMorphNormals = 4;

	// flags

	this.autoScaleCubemaps = true;

	// custom render plugins

	this.renderPluginsPre = [];
	this.renderPluginsPost = [];

	// info

	this.info = {

		memory: {

			programs: 0,
			geometries: 0,
			textures: 0

		},

		render: {

			calls: 0,
			vertices: 0,
			faces: 0,
			points: 0

		}

	};

	// internal properties

	var _this = this,

	_gl,

	_programs = [],
	_programs_counter = 0,

	// internal state cache

	_currentProgram = null,
	_currentFramebuffer = null,
	_currentMaterialId = -1,
	_currentGeometryGroupHash = null,
	_currentCamera = null,
	_geometryGroupCounter = 0,

	// GL state cache

	_oldDoubleSided = -1,
	_oldFlipSided = -1,

	_oldBlending = -1,

	_oldBlendEquation = -1,
	_oldBlendSrc = -1,
	_oldBlendDst = -1,

	_oldDepthTest = -1,
	_oldDepthWrite = -1,

	_oldPolygonOffset = null,
	_oldPolygonOffsetFactor = null,
	_oldPolygonOffsetUnits = null,

	_oldLineWidth = null,

	_viewportX = 0,
	_viewportY = 0,
	_viewportWidth = 0,
	_viewportHeight = 0,
	_currentWidth = 0,
	_currentHeight = 0,

	// frustum

	_frustum = new THREE.Frustum(),

	 // camera matrices cache

	_projScreenMatrix = new THREE.Matrix4(),
	_projScreenMatrixPS = new THREE.Matrix4(),

	_vector3 = new THREE.Vector4(),

	// light arrays cache

	_direction = new THREE.Vector3(),

	_lightsNeedUpdate = true,

	_lights = {

		ambient: [ 0, 0, 0 ],
		directional: { length: 0, colors: new Array(), positions: new Array() },
		point: { length: 0, colors: new Array(), positions: new Array(), distances: new Array() },
		spot: { length: 0, colors: new Array(), positions: new Array(), distances: new Array(), directions: new Array(), angles: new Array(), exponents: new Array() }

	};

	// initialize

	_gl = initGL();

	setDefaultGLState();

	this.context = _gl;

	// GPU capabilities

	var _maxVertexTextures = _gl.getParameter( _gl.MAX_VERTEX_TEXTURE_IMAGE_UNITS ),
	_maxTextureSize = _gl.getParameter( _gl.MAX_TEXTURE_SIZE ),
	_maxCubemapSize = _gl.getParameter( _gl.MAX_CUBE_MAP_TEXTURE_SIZE );

	// API

	this.getContext = function () {

		return _gl;

	};

	this.supportsVertexTextures = function () {

		return _maxVertexTextures > 0;

	};

	this.setSize = function ( width, height ) {

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

		this.setViewport( 0, 0, _canvas.width, _canvas.height );

	};

	this.setViewport = function ( x, y, width, height ) {

		_viewportX = x;
		_viewportY = y;

		_viewportWidth = width;
		_viewportHeight = height;

		_gl.viewport( _viewportX, _viewportY, _viewportWidth, _viewportHeight );

	};

	this.setScissor = function ( x, y, width, height ) {

		_gl.scissor( x, y, width, height );

	};

	this.enableScissorTest = function ( enable ) {

		enable ? _gl.enable( _gl.SCISSOR_TEST ) : _gl.disable( _gl.SCISSOR_TEST );

	};

	// Clearing

	this.setClearColorHex = function ( hex, alpha ) {

		_clearColor.setHex( hex );
		_clearAlpha = alpha;

		_gl.clearColor( _clearColor.r, _clearColor.g, _clearColor.b, _clearAlpha );

	};

	this.setClearColor = function ( color, alpha ) {

		_clearColor.copy( color );
		_clearAlpha = alpha;

		_gl.clearColor( _clearColor.r, _clearColor.g, _clearColor.b, _clearAlpha );

	};

	this.getClearColor = function () {

		return _clearColor;

	};

	this.getClearAlpha = function () {

		return _clearAlpha;

	};

	this.clear = function ( color, depth, stencil ) {

		var bits = 0;

		if ( color === undefined || color ) bits |= _gl.COLOR_BUFFER_BIT;
		if ( depth === undefined || depth ) bits |= _gl.DEPTH_BUFFER_BIT;
		if ( stencil === undefined || stencil ) bits |= _gl.STENCIL_BUFFER_BIT;

		_gl.clear( bits );

	};

	this.clearTarget = function ( renderTarget, color, depth, stencil ) {

		this.setRenderTarget( renderTarget );
		this.clear( color, depth, stencil );

	};

	// Plugins

	this.addPostPlugin = function ( plugin ) {

		plugin.init( this );
		this.renderPluginsPost.push( plugin );

	};

	this.addPrePlugin = function ( plugin ) {

		plugin.init( this );
		this.renderPluginsPre.push( plugin );

	};

	// Deallocation

	this.deallocateObject = function ( object ) {

		if ( ! object.__webglInit ) return;

		object.__webglInit = false;

		delete object._modelViewMatrix;
		delete object._normalMatrix;

		delete object._normalMatrixArray;
		delete object._modelViewMatrixArray;
		delete object._objectMatrixArray;

		if ( object instanceof THREE.Mesh ) {

			for ( var g in object.geometry.geometryGroups ) {

				deleteMeshBuffers( object.geometry.geometryGroups[ g ] );

			}

		} else if ( object instanceof THREE.Ribbon ) {

			deleteRibbonBuffers( object.geometry );

		} else if ( object instanceof THREE.Line ) {

			deleteLineBuffers( object.geometry );

		} else if ( object instanceof THREE.ParticleSystem ) {

			deleteParticleBuffers( object.geometry );

		}

	};

	this.deallocateTexture = function ( texture ) {

		if ( ! texture.__webglInit ) return;

		texture.__webglInit = false;
		_gl.deleteTexture( texture.__webglTexture );

		_this.info.memory.textures --;

	};

	this.deallocateRenderTarget = function ( renderTarget ) {

		if ( !renderTarget || ! renderTarget.__webglTexture ) return;

		_gl.deleteTexture( renderTarget.__webglTexture );

		if ( renderTarget instanceof THREE.WebGLRenderTargetCube ) {

			for ( var i = 0; i < 6; i ++ ) {

				_gl.deleteFramebuffer( renderTarget.__webglFramebuffer[ i ] );
				_gl.deleteRenderbuffer( renderTarget.__webglRenderbuffer[ i ] );

			}

		} else {

			_gl.deleteFramebuffer( renderTarget.__webglFramebuffer );
			_gl.deleteRenderbuffer( renderTarget.__webglRenderbuffer );

		}

	};

	this.deallocateMaterial = function ( material ) {

		var program = material.program;

		if ( ! program ) return;

		material.program = undefined;

		// only deallocate GL program if this was the last use of shared program
		// assumed there is only single copy of any program in the _programs list
		// (that's how it's constructed)

		var i, il, programInfo;
		var deleteProgram = false;

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

			programInfo = _programs[ i ];

			if ( programInfo.program === program ) {

				programInfo.usedTimes --;

				if ( programInfo.usedTimes === 0 ) {

					deleteProgram = true;

				}

				break;

			}

		}

		if ( deleteProgram ) {

			// avoid using array.splice, this is costlier than creating new array from scratch

			var newPrograms = [];

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

				programInfo = _programs[ i ];

				if ( programInfo.program !== program ) {

					newPrograms.push( programInfo );

				}

			}

			_programs = newPrograms;

			_gl.deleteProgram( program );

			_this.info.memory.programs --;

		}

	};

	// Rendering

	this.updateShadowMap = function ( scene, camera ) {

		_currentProgram = null;
		_oldBlending = -1;
		_oldDepthTest = -1;
		_oldDepthWrite = -1;
		_currentGeometryGroupHash = -1;
		_currentMaterialId = -1;
		_lightsNeedUpdate = true;
		_oldDoubleSided = -1;
		_oldFlipSided = -1;

		this.shadowMapPlugin.update( scene, camera );

	};

	// Internal functions

	// Buffer allocation

	function createParticleBuffers ( geometry ) {

		geometry.__webglVertexBuffer = _gl.createBuffer();
		geometry.__webglColorBuffer = _gl.createBuffer();

		_this.info.geometries ++;

	};

	function createLineBuffers ( geometry ) {

		geometry.__webglVertexBuffer = _gl.createBuffer();
		geometry.__webglColorBuffer = _gl.createBuffer();

		_this.info.memory.geometries ++;

	};

	function createRibbonBuffers ( geometry ) {

		geometry.__webglVertexBuffer = _gl.createBuffer();
		geometry.__webglColorBuffer = _gl.createBuffer();

		_this.info.memory.geometries ++;

	};

	function createMeshBuffers ( geometryGroup ) {

		geometryGroup.__webglVertexBuffer = _gl.createBuffer();
		geometryGroup.__webglNormalBuffer = _gl.createBuffer();
		geometryGroup.__webglTangentBuffer = _gl.createBuffer();
		geometryGroup.__webglColorBuffer = _gl.createBuffer();
		geometryGroup.__webglUVBuffer = _gl.createBuffer();
		geometryGroup.__webglUV2Buffer = _gl.createBuffer();

		geometryGroup.__webglSkinVertexABuffer = _gl.createBuffer();
		geometryGroup.__webglSkinVertexBBuffer = _gl.createBuffer();
		geometryGroup.__webglSkinIndicesBuffer = _gl.createBuffer();
		geometryGroup.__webglSkinWeightsBuffer = _gl.createBuffer();

		geometryGroup.__webglFaceBuffer = _gl.createBuffer();
		geometryGroup.__webglLineBuffer = _gl.createBuffer();

		var m, ml;

		if ( geometryGroup.numMorphTargets ) {

			geometryGroup.__webglMorphTargetsBuffers = [];

			for ( m = 0, ml = geometryGroup.numMorphTargets; m < ml; m ++ ) {

				geometryGroup.__webglMorphTargetsBuffers.push( _gl.createBuffer() );

			}

		}

		if ( geometryGroup.numMorphNormals ) {

			geometryGroup.__webglMorphNormalsBuffers = [];

			for ( m = 0, ml = geometryGroup.numMorphNormals; m < ml; m ++ ) {

				geometryGroup.__webglMorphNormalsBuffers.push( _gl.createBuffer() );

			}

		}

		_this.info.memory.geometries ++;

	};

	// Buffer deallocation

	function deleteParticleBuffers ( geometry ) {

		_gl.deleteBuffer( geometry.__webglVertexBuffer );
		_gl.deleteBuffer( geometry.__webglColorBuffer );

		_this.info.memory.geometries --;

	};

	function deleteLineBuffers ( geometry ) {

		_gl.deleteBuffer( geometry.__webglVertexBuffer );
		_gl.deleteBuffer( geometry.__webglColorBuffer );

		_this.info.memory.geometries --;

	};

	function deleteRibbonBuffers ( geometry ) {

		_gl.deleteBuffer( geometry.__webglVertexBuffer );
		_gl.deleteBuffer( geometry.__webglColorBuffer );

		_this.info.memory.geometries --;

	};

	function deleteMeshBuffers ( geometryGroup ) {

		_gl.deleteBuffer( geometryGroup.__webglVertexBuffer );
		_gl.deleteBuffer( geometryGroup.__webglNormalBuffer );
		_gl.deleteBuffer( geometryGroup.__webglTangentBuffer );
		_gl.deleteBuffer( geometryGroup.__webglColorBuffer );
		_gl.deleteBuffer( geometryGroup.__webglUVBuffer );
		_gl.deleteBuffer( geometryGroup.__webglUV2Buffer );

		_gl.deleteBuffer( geometryGroup.__webglSkinVertexABuffer );
		_gl.deleteBuffer( geometryGroup.__webglSkinVertexBBuffer );
		_gl.deleteBuffer( geometryGroup.__webglSkinIndicesBuffer );
		_gl.deleteBuffer( geometryGroup.__webglSkinWeightsBuffer );

		_gl.deleteBuffer( geometryGroup.__webglFaceBuffer );
		_gl.deleteBuffer( geometryGroup.__webglLineBuffer );

		var m, ml;

		if ( geometryGroup.numMorphTargets ) {

			for ( m = 0, ml = geometryGroup.numMorphTargets; m < ml; m ++ ) {

				_gl.deleteBuffer( geometryGroup.__webglMorphTargetsBuffers[ m ] );

			}

		}

		if ( geometryGroup.numMorphNormals ) {

			for ( m = 0, ml = geometryGroup.numMorphNormals; m < ml; m ++ ) {

				_gl.deleteBuffer( geometryGroup.__webglMorphNormalsBuffers[ m ] );

			}

		}


		if ( geometryGroup.__webglCustomAttributesList ) {

			for ( var id in geometryGroup.__webglCustomAttributesList ) {

				_gl.deleteBuffer( geometryGroup.__webglCustomAttributesList[ id ].buffer );

			}

		}

		_this.info.memory.geometries --;

	};

	// Buffer initialization

	function initCustomAttributes ( geometry, object ) {

		var nvertices = geometry.vertices.length;

		var material = object.material;

		if ( material.attributes ) {

			if ( geometry.__webglCustomAttributesList === undefined ) {

				geometry.__webglCustomAttributesList = [];

			}

			for ( var a in material.attributes ) {

				var attribute = material.attributes[ a ];

				if( !attribute.__webglInitialized || attribute.createUniqueBuffers ) {

					attribute.__webglInitialized = true;

					var size = 1;		// "f" and "i"

					if ( attribute.type === "v2" ) size = 2;
					else if ( attribute.type === "v3" ) size = 3;
					else if ( attribute.type === "v4" ) size = 4;
					else if ( attribute.type === "c"  ) size = 3;

					attribute.size = size;

					attribute.array = new Float32Array( nvertices * size );

					attribute.buffer = _gl.createBuffer();
					attribute.buffer.belongsToAttribute = a;

					attribute.needsUpdate = true;

				}

				geometry.__webglCustomAttributesList.push( attribute );

			}

		}

	};

	function initParticleBuffers ( geometry, object ) {

		var nvertices = geometry.vertices.length;

		geometry.__vertexArray = new Float32Array( nvertices * 3 );
		geometry.__colorArray = new Float32Array( nvertices * 3 );

		geometry.__sortArray = [];

		geometry.__webglParticleCount = nvertices;

		initCustomAttributes ( geometry, object );

	};

	function initLineBuffers ( geometry, object ) {

		var nvertices = geometry.vertices.length;

		geometry.__vertexArray = new Float32Array( nvertices * 3 );
		geometry.__colorArray = new Float32Array( nvertices * 3 );

		geometry.__webglLineCount = nvertices;

		initCustomAttributes ( geometry, object );

	};

	function initRibbonBuffers ( geometry ) {

		var nvertices = geometry.vertices.length;

		geometry.__vertexArray = new Float32Array( nvertices * 3 );
		geometry.__colorArray = new Float32Array( nvertices * 3 );

		geometry.__webglVertexCount = nvertices;

	};

	function initMeshBuffers ( geometryGroup, object ) {

		var geometry = object.geometry,
			faces3 = geometryGroup.faces3,
			faces4 = geometryGroup.faces4,

			nvertices = faces3.length * 3 + faces4.length * 4,
			ntris     = faces3.length * 1 + faces4.length * 2,
			nlines    = faces3.length * 3 + faces4.length * 4,

			material = getBufferMaterial( object, geometryGroup ),

			uvType = bufferGuessUVType( material ),
			normalType = bufferGuessNormalType( material ),
			vertexColorType = bufferGuessVertexColorType( material );

		//console.log( "uvType", uvType, "normalType", normalType, "vertexColorType", vertexColorType, object, geometryGroup, material );

		geometryGroup.__vertexArray = new Float32Array( nvertices * 3 );

		if ( normalType ) {

			geometryGroup.__normalArray = new Float32Array( nvertices * 3 );

		}

		if ( geometry.hasTangents ) {

			geometryGroup.__tangentArray = new Float32Array( nvertices * 4 );

		}

		if ( vertexColorType ) {

			geometryGroup.__colorArray = new Float32Array( nvertices * 3 );

		}

		if ( uvType ) {

			if ( geometry.faceUvs.length > 0 || geometry.faceVertexUvs.length > 0 ) {

				geometryGroup.__uvArray = new Float32Array( nvertices * 2 );

			}

			if ( geometry.faceUvs.length > 1 || geometry.faceVertexUvs.length > 1 ) {

				geometryGroup.__uv2Array = new Float32Array( nvertices * 2 );

			}

		}

		if ( object.geometry.skinWeights.length && object.geometry.skinIndices.length ) {

			geometryGroup.__skinVertexAArray = new Float32Array( nvertices * 4 );
			geometryGroup.__skinVertexBArray = new Float32Array( nvertices * 4 );
			geometryGroup.__skinIndexArray = new Float32Array( nvertices * 4 );
			geometryGroup.__skinWeightArray = new Float32Array( nvertices * 4 );

		}

		geometryGroup.__faceArray = new Uint16Array( ntris * 3 );
		geometryGroup.__lineArray = new Uint16Array( nlines * 2 );

		var m, ml;

		if ( geometryGroup.numMorphTargets ) {

			geometryGroup.__morphTargetsArrays = [];

			for ( m = 0, ml = geometryGroup.numMorphTargets; m < ml; m ++ ) {

				geometryGroup.__morphTargetsArrays.push( new Float32Array( nvertices * 3 ) );

			}

		}

		if ( geometryGroup.numMorphNormals ) {

			geometryGroup.__morphNormalsArrays = [];

			for ( m = 0, ml = geometryGroup.numMorphNormals; m < ml; m ++ ) {

				geometryGroup.__morphNormalsArrays.push( new Float32Array( nvertices * 3 ) );

			}

		}

		geometryGroup.__webglFaceCount = ntris * 3;
		geometryGroup.__webglLineCount = nlines * 2;


		// custom attributes

		if ( material.attributes ) {

			if ( geometryGroup.__webglCustomAttributesList === undefined ) {

				geometryGroup.__webglCustomAttributesList = [];

			}

			for ( var a in material.attributes ) {

				// Do a shallow copy of the attribute object so different geometryGroup chunks use different
				// attribute buffers which are correctly indexed in the setMeshBuffers function

				var originalAttribute = material.attributes[ a ];

				var attribute = {};

				for ( var property in originalAttribute ) {

					attribute[ property ] = originalAttribute[ property ];

				}

				if( !attribute.__webglInitialized || attribute.createUniqueBuffers ) {

					attribute.__webglInitialized = true;

					var size = 1;		// "f" and "i"

					if( attribute.type === "v2" ) size = 2;
					else if( attribute.type === "v3" ) size = 3;
					else if( attribute.type === "v4" ) size = 4;
					else if( attribute.type === "c"  ) size = 3;

					attribute.size = size;

					attribute.array = new Float32Array( nvertices * size );

					attribute.buffer = _gl.createBuffer();
					attribute.buffer.belongsToAttribute = a;

					originalAttribute.needsUpdate = true;
					attribute.__original = originalAttribute;

				}

				geometryGroup.__webglCustomAttributesList.push( attribute );

			}

		}

		geometryGroup.__inittedArrays = true;

	};

	function getBufferMaterial( object, geometryGroup ) {

		if ( object.material && ! ( object.material instanceof THREE.MeshFaceMaterial ) ) {

			return object.material;

		} else if ( geometryGroup.materialIndex >= 0 ) {

			return object.geometry.materials[ geometryGroup.materialIndex ];

		}

	};

	function materialNeedsSmoothNormals ( material ) {

		return material && material.shading !== undefined && material.shading === THREE.SmoothShading;

	};

	function bufferGuessNormalType ( material ) {

		// only MeshBasicMaterial and MeshDepthMaterial don't need normals

		if ( ( material instanceof THREE.MeshBasicMaterial && !material.envMap ) || material instanceof THREE.MeshDepthMaterial ) {

			return false;

		}

		if ( materialNeedsSmoothNormals( material ) ) {

			return THREE.SmoothShading;

		} else {

			return THREE.FlatShading;

		}

	};

	function bufferGuessVertexColorType ( material ) {

		if ( material.vertexColors ) {

			return material.vertexColors;

		}

		return false;

	};

	function bufferGuessUVType ( material ) {

		// material must use some texture to require uvs

		if ( material.map || material.lightMap || material instanceof THREE.ShaderMaterial ) {

			return true;

		}

		return false;

	};

	// Buffer setting

	function setParticleBuffers ( geometry, hint, object ) {

		var v, c, vertex, offset, index, color,

		vertices = geometry.vertices,
		vl = vertices.length,

		colors = geometry.colors,
		cl = colors.length,

		vertexArray = geometry.__vertexArray,
		colorArray = geometry.__colorArray,

		sortArray = geometry.__sortArray,

		dirtyVertices = geometry.verticesNeedUpdate,
		dirtyElements = geometry.elementsNeedUpdate,
		dirtyColors = geometry.colorsNeedUpdate,

		customAttributes = geometry.__webglCustomAttributesList,
		i, il,
		a, ca, cal, value,
		customAttribute;

		if ( object.sortParticles ) {

			_projScreenMatrixPS.copy( _projScreenMatrix );
			_projScreenMatrixPS.multiplySelf( object.matrixWorld );

			for ( v = 0; v < vl; v ++ ) {

				vertex = vertices[ v ];

				_vector3.copy( vertex );
				_projScreenMatrixPS.multiplyVector3( _vector3 );

				sortArray[ v ] = [ _vector3.z, v ];

			}

			sortArray.sort( function( a, b ) { return b[ 0 ] - a[ 0 ]; } );

			for ( v = 0; v < vl; v ++ ) {

				vertex = vertices[ sortArray[v][1] ];

				offset = v * 3;

				vertexArray[ offset ]     = vertex.x;
				vertexArray[ offset + 1 ] = vertex.y;
				vertexArray[ offset + 2 ] = vertex.z;

			}

			for ( c = 0; c < cl; c ++ ) {

				offset = c * 3;

				color = colors[ sortArray[c][1] ];

				colorArray[ offset ]     = color.r;
				colorArray[ offset + 1 ] = color.g;
				colorArray[ offset + 2 ] = color.b;

			}

			if ( customAttributes ) {

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

					customAttribute = customAttributes[ i ];

					if ( ! ( customAttribute.boundTo === undefined || customAttribute.boundTo === "vertices" ) ) continue;

					offset = 0;

					cal = customAttribute.value.length;

					if ( customAttribute.size === 1 ) {

						for ( ca = 0; ca < cal; ca ++ ) {

							index = sortArray[ ca ][ 1 ];

							customAttribute.array[ ca ] = customAttribute.value[ index ];

						}

					} else if ( customAttribute.size === 2 ) {

						for ( ca = 0; ca < cal; ca ++ ) {

							index = sortArray[ ca ][ 1 ];

							value = customAttribute.value[ index ];

							customAttribute.array[ offset ] 	= value.x;
							customAttribute.array[ offset + 1 ] = value.y;

							offset += 2;

						}

					} else if ( customAttribute.size === 3 ) {

						if ( customAttribute.type === "c" ) {

							for ( ca = 0; ca < cal; ca ++ ) {

								index = sortArray[ ca ][ 1 ];

								value = customAttribute.value[ index ];

								customAttribute.array[ offset ]     = value.r;
								customAttribute.array[ offset + 1 ] = value.g;
								customAttribute.array[ offset + 2 ] = value.b;

								offset += 3;

							}

						} else {

							for ( ca = 0; ca < cal; ca ++ ) {

								index = sortArray[ ca ][ 1 ];

								value = customAttribute.value[ index ];

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

								offset += 3;

							}

						}

					} else if ( customAttribute.size === 4 ) {

						for ( ca = 0; ca < cal; ca ++ ) {

							index = sortArray[ ca ][ 1 ];

							value = customAttribute.value[ index ];

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

							offset += 4;

						}

					}

				}

			}

		} else {

			if ( dirtyVertices ) {

				for ( v = 0; v < vl; v ++ ) {

					vertex = vertices[ v ];

					offset = v * 3;

					vertexArray[ offset ]     = vertex.x;
					vertexArray[ offset + 1 ] = vertex.y;
					vertexArray[ offset + 2 ] = vertex.z;

				}

			}

			if ( dirtyColors ) {

				for ( c = 0; c < cl; c ++ ) {

					color = colors[ c ];

					offset = c * 3;

					colorArray[ offset ]     = color.r;
					colorArray[ offset + 1 ] = color.g;
					colorArray[ offset + 2 ] = color.b;

				}

			}

			if ( customAttributes ) {

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

					customAttribute = customAttributes[ i ];

					if ( customAttribute.needsUpdate &&
						 ( customAttribute.boundTo === undefined ||
						   customAttribute.boundTo === "vertices") ) {

						cal = customAttribute.value.length;

						offset = 0;

						if ( customAttribute.size === 1 ) {

							for ( ca = 0; ca < cal; ca ++ ) {

								customAttribute.array[ ca ] = customAttribute.value[ ca ];

							}

						} else if ( customAttribute.size === 2 ) {

							for ( ca = 0; ca < cal; ca ++ ) {

								value = customAttribute.value[ ca ];

								customAttribute.array[ offset ] 	= value.x;
								customAttribute.array[ offset + 1 ] = value.y;

								offset += 2;

							}

						} else if ( customAttribute.size === 3 ) {

							if ( customAttribute.type === "c" ) {

								for ( ca = 0; ca < cal; ca ++ ) {

									value = customAttribute.value[ ca ];

									customAttribute.array[ offset ] 	= value.r;
									customAttribute.array[ offset + 1 ] = value.g;
									customAttribute.array[ offset + 2 ] = value.b;

									offset += 3;

								}

							} else {

								for ( ca = 0; ca < cal; ca ++ ) {

									value = customAttribute.value[ ca ];

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

									offset += 3;

								}

							}

						} else if ( customAttribute.size === 4 ) {

							for ( ca = 0; ca < cal; ca ++ ) {

								value = customAttribute.value[ ca ];

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

								offset += 4;

							}

						}

					}

				}

			}

		}

		if ( dirtyVertices || object.sortParticles ) {

			_gl.bindBuffer( _gl.ARRAY_BUFFER, geometry.__webglVertexBuffer );
			_gl.bufferData( _gl.ARRAY_BUFFER, vertexArray, hint );

		}

		if ( dirtyColors || object.sortParticles ) {

			_gl.bindBuffer( _gl.ARRAY_BUFFER, geometry.__webglColorBuffer );
			_gl.bufferData( _gl.ARRAY_BUFFER, colorArray, hint );

		}

		if ( customAttributes ) {

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

				customAttribute = customAttributes[ i ];

				if ( customAttribute.needsUpdate || object.sortParticles ) {

					_gl.bindBuffer( _gl.ARRAY_BUFFER, customAttribute.buffer );
					_gl.bufferData( _gl.ARRAY_BUFFER, customAttribute.array, hint );

				}

			}

		}


	};

	function setLineBuffers ( geometry, hint ) {

		var v, c, vertex, offset, color,

		vertices = geometry.vertices,
		colors = geometry.colors,
		vl = vertices.length,
		cl = colors.length,

		vertexArray = geometry.__vertexArray,
		colorArray = geometry.__colorArray,

		dirtyVertices = geometry.verticesNeedUpdate,
		dirtyColors = geometry.colorsNeedUpdate,

		customAttributes = geometry.__webglCustomAttributesList,

		i, il,
		a, ca, cal, value,
		customAttribute;

		if ( dirtyVertices ) {

			for ( v = 0; v < vl; v ++ ) {

				vertex = vertices[ v ];

				offset = v * 3;

				vertexArray[ offset ]     = vertex.x;
				vertexArray[ offset + 1 ] = vertex.y;
				vertexArray[ offset + 2 ] = vertex.z;

			}

			_gl.bindBuffer( _gl.ARRAY_BUFFER, geometry.__webglVertexBuffer );
			_gl.bufferData( _gl.ARRAY_BUFFER, vertexArray, hint );

		}

		if ( dirtyColors ) {

			for ( c = 0; c < cl; c ++ ) {

				color = colors[ c ];

				offset = c * 3;

				colorArray[ offset ]     = color.r;
				colorArray[ offset + 1 ] = color.g;
				colorArray[ offset + 2 ] = color.b;

			}

			_gl.bindBuffer( _gl.ARRAY_BUFFER, geometry.__webglColorBuffer );
			_gl.bufferData( _gl.ARRAY_BUFFER, colorArray, hint );

		}

		if ( customAttributes ) {

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

				customAttribute = customAttributes[ i ];

				if ( customAttribute.needsUpdate &&
					 ( customAttribute.boundTo === undefined ||
					   customAttribute.boundTo === "vertices" ) ) {

					offset = 0;

					cal = customAttribute.value.length;

					if ( customAttribute.size === 1 ) {

						for ( ca = 0; ca < cal; ca ++ ) {

							customAttribute.array[ ca ] = customAttribute.value[ ca ];

						}

					} else if ( customAttribute.size === 2 ) {

						for ( ca = 0; ca < cal; ca ++ ) {

							value = customAttribute.value[ ca ];

							customAttribute.array[ offset ] 	= value.x;
							customAttribute.array[ offset + 1 ] = value.y;

							offset += 2;

						}

					} else if ( customAttribute.size === 3 ) {

						if ( customAttribute.type === "c" ) {

							for ( ca = 0; ca < cal; ca ++ ) {

								value = customAttribute.value[ ca ];

								customAttribute.array[ offset ] 	= value.r;
								customAttribute.array[ offset + 1 ] = value.g;
								customAttribute.array[ offset + 2 ] = value.b;

								offset += 3;

							}

						} else {

							for ( ca = 0; ca < cal; ca ++ ) {

								value = customAttribute.value[ ca ];

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

								offset += 3;

							}

						}

					} else if ( customAttribute.size === 4 ) {

						for ( ca = 0; ca < cal; ca ++ ) {

							value = customAttribute.value[ ca ];

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

							offset += 4;

						}

					}

					_gl.bindBuffer( _gl.ARRAY_BUFFER, customAttribute.buffer );
					_gl.bufferData( _gl.ARRAY_BUFFER, customAttribute.array, hint );

				}

			}

		}

	};

	function setRibbonBuffers ( geometry, hint ) {

		var v, c, vertex, offset, color,

		vertices = geometry.vertices,
		colors = geometry.colors,
		vl = vertices.length,
		cl = colors.length,

		vertexArray = geometry.__vertexArray,
		colorArray = geometry.__colorArray,

		dirtyVertices = geometry.verticesNeedUpdate,
		dirtyColors = geometry.colorsNeedUpdate;

		if ( dirtyVertices ) {

			for ( v = 0; v < vl; v ++ ) {

				vertex = vertices[ v ];

				offset = v * 3;

				vertexArray[ offset ]     = vertex.x;
				vertexArray[ offset + 1 ] = vertex.y;
				vertexArray[ offset + 2 ] = vertex.z;

			}

			_gl.bindBuffer( _gl.ARRAY_BUFFER, geometry.__webglVertexBuffer );
			_gl.bufferData( _gl.ARRAY_BUFFER, vertexArray, hint );

		}

		if ( dirtyColors ) {

			for ( c = 0; c < cl; c ++ ) {

				color = colors[ c ];

				offset = c * 3;

				colorArray[ offset ]     = color.r;
				colorArray[ offset + 1 ] = color.g;
				colorArray[ offset + 2 ] = color.b;

			}

			_gl.bindBuffer( _gl.ARRAY_BUFFER, geometry.__webglColorBuffer );
			_gl.bufferData( _gl.ARRAY_BUFFER, colorArray, hint );

		}

	};

	function setMeshBuffers( geometryGroup, object, hint, dispose, material ) {

		if ( ! geometryGroup.__inittedArrays ) {

			// console.log( object );
			return;

		}

		var normalType = bufferGuessNormalType( material ),
		vertexColorType = bufferGuessVertexColorType( material ),
		uvType = bufferGuessUVType( material ),

		needsSmoothNormals = ( normalType === THREE.SmoothShading );

		var f, fl, fi, face,
		vertexNormals, faceNormal, normal,
		vertexColors, faceColor,
		vertexTangents,
		uv, uv2, v1, v2, v3, v4, t1, t2, t3, t4, n1, n2, n3, n4,
		c1, c2, c3, c4,
		sw1, sw2, sw3, sw4,
		si1, si2, si3, si4,
		sa1, sa2, sa3, sa4,
		sb1, sb2, sb3, sb4,
		m, ml, i, il,
		vn, uvi, uv2i,
		vk, vkl, vka,
		nka, chf, faceVertexNormals,
		a,

		vertexIndex = 0,

		offset = 0,
		offset_uv = 0,
		offset_uv2 = 0,
		offset_face = 0,
		offset_normal = 0,
		offset_tangent = 0,
		offset_line = 0,
		offset_color = 0,
		offset_skin = 0,
		offset_morphTarget = 0,
		offset_custom = 0,
		offset_customSrc = 0,

		value,

		vertexArray = geometryGroup.__vertexArray,
		uvArray = geometryGroup.__uvArray,
		uv2Array = geometryGroup.__uv2Array,
		normalArray = geometryGroup.__normalArray,
		tangentArray = geometryGroup.__tangentArray,
		colorArray = geometryGroup.__colorArray,

		skinVertexAArray = geometryGroup.__skinVertexAArray,
		skinVertexBArray = geometryGroup.__skinVertexBArray,
		skinIndexArray = geometryGroup.__skinIndexArray,
		skinWeightArray = geometryGroup.__skinWeightArray,

		morphTargetsArrays = geometryGroup.__morphTargetsArrays,
		morphNormalsArrays = geometryGroup.__morphNormalsArrays,

		customAttributes = geometryGroup.__webglCustomAttributesList,
		customAttribute,

		faceArray = geometryGroup.__faceArray,
		lineArray = geometryGroup.__lineArray,

		geometry = object.geometry, // this is shared for all chunks

		dirtyVertices = geometry.verticesNeedUpdate,
		dirtyElements = geometry.elementsNeedUpdate,
		dirtyUvs = geometry.uvsNeedUpdate,
		dirtyNormals = geometry.normalsNeedUpdate,
		dirtyTangents = geometry.tangetsNeedUpdate,
		dirtyColors = geometry.colorsNeedUpdate,
		dirtyMorphTargets = geometry.morphTargetsNeedUpdate,

		vertices = geometry.vertices,
		chunk_faces3 = geometryGroup.faces3,
		chunk_faces4 = geometryGroup.faces4,
		obj_faces = geometry.faces,

		obj_uvs  = geometry.faceVertexUvs[ 0 ],
		obj_uvs2 = geometry.faceVertexUvs[ 1 ],

		obj_colors = geometry.colors,

		obj_skinVerticesA = geometry.skinVerticesA,
		obj_skinVerticesB = geometry.skinVerticesB,
		obj_skinIndices = geometry.skinIndices,
		obj_skinWeights = geometry.skinWeights,

		morphTargets = geometry.morphTargets,
		morphNormals = geometry.morphNormals;

		if ( dirtyVertices ) {

			for ( f = 0, fl = chunk_faces3.length; f < fl; f ++ ) {

				face = obj_faces[ chunk_faces3[ f ] ];

				v1 = vertices[ face.a ];
				v2 = vertices[ face.b ];
				v3 = vertices[ face.c ];

				vertexArray[ offset ]     = v1.x;
				vertexArray[ offset + 1 ] = v1.y;
				vertexArray[ offset + 2 ] = v1.z;

				vertexArray[ offset + 3 ] = v2.x;
				vertexArray[ offset + 4 ] = v2.y;
				vertexArray[ offset + 5 ] = v2.z;

				vertexArray[ offset + 6 ] = v3.x;
				vertexArray[ offset + 7 ] = v3.y;
				vertexArray[ offset + 8 ] = v3.z;

				offset += 9;

			}

			for ( f = 0, fl = chunk_faces4.length; f < fl; f ++ ) {

				face = obj_faces[ chunk_faces4[ f ] ];

				v1 = vertices[ face.a ];
				v2 = vertices[ face.b ];
				v3 = vertices[ face.c ];
				v4 = vertices[ face.d ];

				vertexArray[ offset ]     = v1.x;
				vertexArray[ offset + 1 ] = v1.y;
				vertexArray[ offset + 2 ] = v1.z;

				vertexArray[ offset + 3 ] = v2.x;
				vertexArray[ offset + 4 ] = v2.y;
				vertexArray[ offset + 5 ] = v2.z;

				vertexArray[ offset + 6 ] = v3.x;
				vertexArray[ offset + 7 ] = v3.y;
				vertexArray[ offset + 8 ] = v3.z;

				vertexArray[ offset + 9 ]  = v4.x;
				vertexArray[ offset + 10 ] = v4.y;
				vertexArray[ offset + 11 ] = v4.z;

				offset += 12;

			}

			_gl.bindBuffer( _gl.ARRAY_BUFFER, geometryGroup.__webglVertexBuffer );
			_gl.bufferData( _gl.ARRAY_BUFFER, vertexArray, hint );

		}

		if ( dirtyMorphTargets ) {

			for ( vk = 0, vkl = morphTargets.length; vk < vkl; vk ++ ) {

				offset_morphTarget = 0;

				for ( f = 0, fl = chunk_faces3.length; f < fl; f ++ ) {

					chf = chunk_faces3[ f ];
					face = obj_faces[ chf ];

					// morph positions

					v1 = morphTargets[ vk ].vertices[ face.a ];
					v2 = morphTargets[ vk ].vertices[ face.b ];
					v3 = morphTargets[ vk ].vertices[ face.c ];

					vka = morphTargetsArrays[ vk ];

					vka[ offset_morphTarget ] 	  = v1.x;
					vka[ offset_morphTarget + 1 ] = v1.y;
					vka[ offset_morphTarget + 2 ] = v1.z;

					vka[ offset_morphTarget + 3 ] = v2.x;
					vka[ offset_morphTarget + 4 ] = v2.y;
					vka[ offset_morphTarget + 5 ] = v2.z;

					vka[ offset_morphTarget + 6 ] = v3.x;
					vka[ offset_morphTarget + 7 ] = v3.y;
					vka[ offset_morphTarget + 8 ] = v3.z;

					// morph normals

					if ( material.morphNormals ) {

						if ( needsSmoothNormals ) {

							faceVertexNormals = morphNormals[ vk ].vertexNormals[ chf ];

							n1 = faceVertexNormals.a;
							n2 = faceVertexNormals.b;
							n3 = faceVertexNormals.c;

						} else {

							n1 = morphNormals[ vk ].faceNormals[ chf ];
							n2 = n1;
							n3 = n1;

						}

						nka = morphNormalsArrays[ vk ];

						nka[ offset_morphTarget ] 	  = n1.x;
						nka[ offset_morphTarget + 1 ] = n1.y;
						nka[ offset_morphTarget + 2 ] = n1.z;

						nka[ offset_morphTarget + 3 ] = n2.x;
						nka[ offset_morphTarget + 4 ] = n2.y;
						nka[ offset_morphTarget + 5 ] = n2.z;

						nka[ offset_morphTarget + 6 ] = n3.x;
						nka[ offset_morphTarget + 7 ] = n3.y;
						nka[ offset_morphTarget + 8 ] = n3.z;

					}

					//

					offset_morphTarget += 9;

				}

				for ( f = 0, fl = chunk_faces4.length; f < fl; f ++ ) {

					chf = chunk_faces4[ f ];
					face = obj_faces[ chf ];

					// morph positions

					v1 = morphTargets[ vk ].vertices[ face.a ];
					v2 = morphTargets[ vk ].vertices[ face.b ];
					v3 = morphTargets[ vk ].vertices[ face.c ];
					v4 = morphTargets[ vk ].vertices[ face.d ];

					vka = morphTargetsArrays[ vk ];

					vka[ offset_morphTarget ] 	  = v1.x;
					vka[ offset_morphTarget + 1 ] = v1.y;
					vka[ offset_morphTarget + 2 ] = v1.z;

					vka[ offset_morphTarget + 3 ] = v2.x;
					vka[ offset_morphTarget + 4 ] = v2.y;
					vka[ offset_morphTarget + 5 ] = v2.z;

					vka[ offset_morphTarget + 6 ] = v3.x;
					vka[ offset_morphTarget + 7 ] = v3.y;
					vka[ offset_morphTarget + 8 ] = v3.z;

					vka[ offset_morphTarget + 9 ]  = v4.x;
					vka[ offset_morphTarget + 10 ] = v4.y;
					vka[ offset_morphTarget + 11 ] = v4.z;

					// morph normals

					if ( material.morphNormals ) {

						if ( needsSmoothNormals ) {

							faceVertexNormals = morphNormals[ vk ].vertexNormals[ chf ];

							n1 = faceVertexNormals.a;
							n2 = faceVertexNormals.b;
							n3 = faceVertexNormals.c;
							n4 = faceVertexNormals.d;

						} else {

							n1 = morphNormals[ vk ].faceNormals[ chf ];
							n2 = n1;
							n3 = n1;
							n4 = n1;

						}

						nka = morphNormalsArrays[ vk ];

						nka[ offset_morphTarget ] 	  = n1.x;
						nka[ offset_morphTarget + 1 ] = n1.y;
						nka[ offset_morphTarget + 2 ] = n1.z;

						nka[ offset_morphTarget + 3 ] = n2.x;
						nka[ offset_morphTarget + 4 ] = n2.y;
						nka[ offset_morphTarget + 5 ] = n2.z;

						nka[ offset_morphTarget + 6 ] = n3.x;
						nka[ offset_morphTarget + 7 ] = n3.y;
						nka[ offset_morphTarget + 8 ] = n3.z;

						nka[ offset_morphTarget + 9 ]  = n4.x;
						nka[ offset_morphTarget + 10 ] = n4.y;
						nka[ offset_morphTarget + 11 ] = n4.z;

					}

					//

					offset_morphTarget += 12;

				}

				_gl.bindBuffer( _gl.ARRAY_BUFFER, geometryGroup.__webglMorphTargetsBuffers[ vk ] );
				_gl.bufferData( _gl.ARRAY_BUFFER, morphTargetsArrays[ vk ], hint );

				if ( material.morphNormals ) {

					_gl.bindBuffer( _gl.ARRAY_BUFFER, geometryGroup.__webglMorphNormalsBuffers[ vk ] );
					_gl.bufferData( _gl.ARRAY_BUFFER, morphNormalsArrays[ vk ], hint );

				}

			}

		}

		if ( obj_skinWeights.length ) {

			for ( f = 0, fl = chunk_faces3.length; f < fl; f ++ ) {

				face = obj_faces[ chunk_faces3[ f ]	];

				// weights

				sw1 = obj_skinWeights[ face.a ];
				sw2 = obj_skinWeights[ face.b ];
				sw3 = obj_skinWeights[ face.c ];

				skinWeightArray[ offset_skin ]     = sw1.x;
				skinWeightArray[ offset_skin + 1 ] = sw1.y;
				skinWeightArray[ offset_skin + 2 ] = sw1.z;
				skinWeightArray[ offset_skin + 3 ] = sw1.w;

				skinWeightArray[ offset_skin + 4 ] = sw2.x;
				skinWeightArray[ offset_skin + 5 ] = sw2.y;
				skinWeightArray[ offset_skin + 6 ] = sw2.z;
				skinWeightArray[ offset_skin + 7 ] = sw2.w;

				skinWeightArray[ offset_skin + 8 ]  = sw3.x;
				skinWeightArray[ offset_skin + 9 ]  = sw3.y;
				skinWeightArray[ offset_skin + 10 ] = sw3.z;
				skinWeightArray[ offset_skin + 11 ] = sw3.w;

				// indices

				si1 = obj_skinIndices[ face.a ];
				si2 = obj_skinIndices[ face.b ];
				si3 = obj_skinIndices[ face.c ];

				skinIndexArray[ offset_skin ]     = si1.x;
				skinIndexArray[ offset_skin + 1 ] = si1.y;
				skinIndexArray[ offset_skin + 2 ] = si1.z;
				skinIndexArray[ offset_skin + 3 ] = si1.w;

				skinIndexArray[ offset_skin + 4 ] = si2.x;
				skinIndexArray[ offset_skin + 5 ] = si2.y;
				skinIndexArray[ offset_skin + 6 ] = si2.z;
				skinIndexArray[ offset_skin + 7 ] = si2.w;

				skinIndexArray[ offset_skin + 8 ]  = si3.x;
				skinIndexArray[ offset_skin + 9 ]  = si3.y;
				skinIndexArray[ offset_skin + 10 ] = si3.z;
				skinIndexArray[ offset_skin + 11 ] = si3.w;

				// vertices A

				sa1 = obj_skinVerticesA[ face.a ];
				sa2 = obj_skinVerticesA[ face.b ];
				sa3 = obj_skinVerticesA[ face.c ];

				skinVertexAArray[ offset_skin ]     = sa1.x;
				skinVertexAArray[ offset_skin + 1 ] = sa1.y;
				skinVertexAArray[ offset_skin + 2 ] = sa1.z;
				skinVertexAArray[ offset_skin + 3 ] = 1; // pad for faster vertex shader

				skinVertexAArray[ offset_skin + 4 ] = sa2.x;
				skinVertexAArray[ offset_skin + 5 ] = sa2.y;
				skinVertexAArray[ offset_skin + 6 ] = sa2.z;
				skinVertexAArray[ offset_skin + 7 ] = 1;

				skinVertexAArray[ offset_skin + 8 ]  = sa3.x;
				skinVertexAArray[ offset_skin + 9 ]  = sa3.y;
				skinVertexAArray[ offset_skin + 10 ] = sa3.z;
				skinVertexAArray[ offset_skin + 11 ] = 1;

				// vertices B

				sb1 = obj_skinVerticesB[ face.a ];
				sb2 = obj_skinVerticesB[ face.b ];
				sb3 = obj_skinVerticesB[ face.c ];

				skinVertexBArray[ offset_skin ]     = sb1.x;
				skinVertexBArray[ offset_skin + 1 ] = sb1.y;
				skinVertexBArray[ offset_skin + 2 ] = sb1.z;
				skinVertexBArray[ offset_skin + 3 ] = 1; // pad for faster vertex shader

				skinVertexBArray[ offset_skin + 4 ] = sb2.x;
				skinVertexBArray[ offset_skin + 5 ] = sb2.y;
				skinVertexBArray[ offset_skin + 6 ] = sb2.z;
				skinVertexBArray[ offset_skin + 7 ] = 1;

				skinVertexBArray[ offset_skin + 8 ]  = sb3.x;
				skinVertexBArray[ offset_skin + 9 ]  = sb3.y;
				skinVertexBArray[ offset_skin + 10 ] = sb3.z;
				skinVertexBArray[ offset_skin + 11 ] = 1;

				offset_skin += 12;

			}

			for ( f = 0, fl = chunk_faces4.length; f < fl; f ++ ) {

				face = obj_faces[ chunk_faces4[ f ] ];

				// weights

				sw1 = obj_skinWeights[ face.a ];
				sw2 = obj_skinWeights[ face.b ];
				sw3 = obj_skinWeights[ face.c ];
				sw4 = obj_skinWeights[ face.d ];

				skinWeightArray[ offset_skin ]     = sw1.x;
				skinWeightArray[ offset_skin + 1 ] = sw1.y;
				skinWeightArray[ offset_skin + 2 ] = sw1.z;
				skinWeightArray[ offset_skin + 3 ] = sw1.w;

				skinWeightArray[ offset_skin + 4 ] = sw2.x;
				skinWeightArray[ offset_skin + 5 ] = sw2.y;
				skinWeightArray[ offset_skin + 6 ] = sw2.z;
				skinWeightArray[ offset_skin + 7 ] = sw2.w;

				skinWeightArray[ offset_skin + 8 ]  = sw3.x;
				skinWeightArray[ offset_skin + 9 ]  = sw3.y;
				skinWeightArray[ offset_skin + 10 ] = sw3.z;
				skinWeightArray[ offset_skin + 11 ] = sw3.w;

				skinWeightArray[ offset_skin + 12 ] = sw4.x;
				skinWeightArray[ offset_skin + 13 ] = sw4.y;
				skinWeightArray[ offset_skin + 14 ] = sw4.z;
				skinWeightArray[ offset_skin + 15 ] = sw4.w;

				// indices

				si1 = obj_skinIndices[ face.a ];
				si2 = obj_skinIndices[ face.b ];
				si3 = obj_skinIndices[ face.c ];
				si4 = obj_skinIndices[ face.d ];

				skinIndexArray[ offset_skin ]     = si1.x;
				skinIndexArray[ offset_skin + 1 ] = si1.y;
				skinIndexArray[ offset_skin + 2 ] = si1.z;
				skinIndexArray[ offset_skin + 3 ] = si1.w;

				skinIndexArray[ offset_skin + 4 ] = si2.x;
				skinIndexArray[ offset_skin + 5 ] = si2.y;
				skinIndexArray[ offset_skin + 6 ] = si2.z;
				skinIndexArray[ offset_skin + 7 ] = si2.w;

				skinIndexArray[ offset_skin + 8 ]  = si3.x;
				skinIndexArray[ offset_skin + 9 ]  = si3.y;
				skinIndexArray[ offset_skin + 10 ] = si3.z;
				skinIndexArray[ offset_skin + 11 ] = si3.w;

				skinIndexArray[ offset_skin + 12 ] = si4.x;
				skinIndexArray[ offset_skin + 13 ] = si4.y;
				skinIndexArray[ offset_skin + 14 ] = si4.z;
				skinIndexArray[ offset_skin + 15 ] = si4.w;

				// vertices A

				sa1 = obj_skinVerticesA[ face.a ];
				sa2 = obj_skinVerticesA[ face.b ];
				sa3 = obj_skinVerticesA[ face.c ];
				sa4 = obj_skinVerticesA[ face.d ];

				skinVertexAArray[ offset_skin ]     = sa1.x;
				skinVertexAArray[ offset_skin + 1 ] = sa1.y;
				skinVertexAArray[ offset_skin + 2 ] = sa1.z;
				skinVertexAArray[ offset_skin + 3 ] = 1; // pad for faster vertex shader

				skinVertexAArray[ offset_skin + 4 ] = sa2.x;
				skinVertexAArray[ offset_skin + 5 ] = sa2.y;
				skinVertexAArray[ offset_skin + 6 ] = sa2.z;
				skinVertexAArray[ offset_skin + 7 ] = 1;

				skinVertexAArray[ offset_skin + 8 ]  = sa3.x;
				skinVertexAArray[ offset_skin + 9 ]  = sa3.y;
				skinVertexAArray[ offset_skin + 10 ] = sa3.z;
				skinVertexAArray[ offset_skin + 11 ] = 1;

				skinVertexAArray[ offset_skin + 12 ] = sa4.x;
				skinVertexAArray[ offset_skin + 13 ] = sa4.y;
				skinVertexAArray[ offset_skin + 14 ] = sa4.z;
				skinVertexAArray[ offset_skin + 15 ] = 1;

				// vertices B

				sb1 = obj_skinVerticesB[ face.a ];
				sb2 = obj_skinVerticesB[ face.b ];
				sb3 = obj_skinVerticesB[ face.c ];
				sb4 = obj_skinVerticesB[ face.d ];

				skinVertexBArray[ offset_skin ]     = sb1.x;
				skinVertexBArray[ offset_skin + 1 ] = sb1.y;
				skinVertexBArray[ offset_skin + 2 ] = sb1.z;
				skinVertexBArray[ offset_skin + 3 ] = 1; // pad for faster vertex shader

				skinVertexBArray[ offset_skin + 4 ] = sb2.x;
				skinVertexBArray[ offset_skin + 5 ] = sb2.y;
				skinVertexBArray[ offset_skin + 6 ] = sb2.z;
				skinVertexBArray[ offset_skin + 7 ] = 1;

				skinVertexBArray[ offset_skin + 8 ]  = sb3.x;
				skinVertexBArray[ offset_skin + 9 ]  = sb3.y;
				skinVertexBArray[ offset_skin + 10 ] = sb3.z;
				skinVertexBArray[ offset_skin + 11 ] = 1;

				skinVertexBArray[ offset_skin + 12 ] = sb4.x;
				skinVertexBArray[ offset_skin + 13 ] = sb4.y;
				skinVertexBArray[ offset_skin + 14 ] = sb4.z;
				skinVertexBArray[ offset_skin + 15 ] = 1;

				offset_skin += 16;

			}

			if ( offset_skin > 0 ) {

				_gl.bindBuffer( _gl.ARRAY_BUFFER, geometryGroup.__webglSkinVertexABuffer );
				_gl.bufferData( _gl.ARRAY_BUFFER, skinVertexAArray, hint );

				_gl.bindBuffer( _gl.ARRAY_BUFFER, geometryGroup.__webglSkinVertexBBuffer );
				_gl.bufferData( _gl.ARRAY_BUFFER, skinVertexBArray, hint );

				_gl.bindBuffer( _gl.ARRAY_BUFFER, geometryGroup.__webglSkinIndicesBuffer );
				_gl.bufferData( _gl.ARRAY_BUFFER, skinIndexArray, hint );

				_gl.bindBuffer( _gl.ARRAY_BUFFER, geometryGroup.__webglSkinWeightsBuffer );
				_gl.bufferData( _gl.ARRAY_BUFFER, skinWeightArray, hint );

			}

		}

		if ( dirtyColors && vertexColorType ) {

			for ( f = 0, fl = chunk_faces3.length; f < fl; f ++ ) {

				face = obj_faces[ chunk_faces3[ f ]	];

				vertexColors = face.vertexColors;
				faceColor = face.color;

				if ( vertexColors.length === 3 && vertexColorType === THREE.VertexColors ) {

					c1 = vertexColors[ 0 ];
					c2 = vertexColors[ 1 ];
					c3 = vertexColors[ 2 ];

				} else {

					c1 = faceColor;
					c2 = faceColor;
					c3 = faceColor;

				}

				colorArray[ offset_color ]     = c1.r;
				colorArray[ offset_color + 1 ] = c1.g;
				colorArray[ offset_color + 2 ] = c1.b;

				colorArray[ offset_color + 3 ] = c2.r;
				colorArray[ offset_color + 4 ] = c2.g;
				colorArray[ offset_color + 5 ] = c2.b;

				colorArray[ offset_color + 6 ] = c3.r;
				colorArray[ offset_color + 7 ] = c3.g;
				colorArray[ offset_color + 8 ] = c3.b;

				offset_color += 9;

			}

			for ( f = 0, fl = chunk_faces4.length; f < fl; f ++ ) {

				face = obj_faces[ chunk_faces4[ f ] ];

				vertexColors = face.vertexColors;
				faceColor = face.color;

				if ( vertexColors.length === 4 && vertexColorType === THREE.VertexColors ) {

					c1 = vertexColors[ 0 ];
					c2 = vertexColors[ 1 ];
					c3 = vertexColors[ 2 ];
					c4 = vertexColors[ 3 ];

				} else {

					c1 = faceColor;
					c2 = faceColor;
					c3 = faceColor;
					c4 = faceColor;

				}

				colorArray[ offset_color ]     = c1.r;
				colorArray[ offset_color + 1 ] = c1.g;
				colorArray[ offset_color + 2 ] = c1.b;

				colorArray[ offset_color + 3 ] = c2.r;
				colorArray[ offset_color + 4 ] = c2.g;
				colorArray[ offset_color + 5 ] = c2.b;

				colorArray[ offset_color + 6 ] = c3.r;
				colorArray[ offset_color + 7 ] = c3.g;
				colorArray[ offset_color + 8 ] = c3.b;

				colorArray[ offset_color + 9 ]  = c4.r;
				colorArray[ offset_color + 10 ] = c4.g;
				colorArray[ offset_color + 11 ] = c4.b;

				offset_color += 12;

			}

			if ( offset_color > 0 ) {

				_gl.bindBuffer( _gl.ARRAY_BUFFER, geometryGroup.__webglColorBuffer );
				_gl.bufferData( _gl.ARRAY_BUFFER, colorArray, hint );

			}

		}

		if ( dirtyTangents && geometry.hasTangents ) {

			for ( f = 0, fl = chunk_faces3.length; f < fl; f ++ ) {

				face = obj_faces[ chunk_faces3[ f ]	];

				vertexTangents = face.vertexTangents;

				t1 = vertexTangents[ 0 ];
				t2 = vertexTangents[ 1 ];
				t3 = vertexTangents[ 2 ];

				tangentArray[ offset_tangent ]     = t1.x;
				tangentArray[ offset_tangent + 1 ] = t1.y;
				tangentArray[ offset_tangent + 2 ] = t1.z;
				tangentArray[ offset_tangent + 3 ] = t1.w;

				tangentArray[ offset_tangent + 4 ] = t2.x;
				tangentArray[ offset_tangent + 5 ] = t2.y;
				tangentArray[ offset_tangent + 6 ] = t2.z;
				tangentArray[ offset_tangent + 7 ] = t2.w;

				tangentArray[ offset_tangent + 8 ]  = t3.x;
				tangentArray[ offset_tangent + 9 ]  = t3.y;
				tangentArray[ offset_tangent + 10 ] = t3.z;
				tangentArray[ offset_tangent + 11 ] = t3.w;

				offset_tangent += 12;

			}

			for ( f = 0, fl = chunk_faces4.length; f < fl; f ++ ) {

				face = obj_faces[ chunk_faces4[ f ] ];

				vertexTangents = face.vertexTangents;

				t1 = vertexTangents[ 0 ];
				t2 = vertexTangents[ 1 ];
				t3 = vertexTangents[ 2 ];
				t4 = vertexTangents[ 3 ];

				tangentArray[ offset_tangent ]     = t1.x;
				tangentArray[ offset_tangent + 1 ] = t1.y;
				tangentArray[ offset_tangent + 2 ] = t1.z;
				tangentArray[ offset_tangent + 3 ] = t1.w;

				tangentArray[ offset_tangent + 4 ] = t2.x;
				tangentArray[ offset_tangent + 5 ] = t2.y;
				tangentArray[ offset_tangent + 6 ] = t2.z;
				tangentArray[ offset_tangent + 7 ] = t2.w;

				tangentArray[ offset_tangent + 8 ]  = t3.x;
				tangentArray[ offset_tangent + 9 ]  = t3.y;
				tangentArray[ offset_tangent + 10 ] = t3.z;
				tangentArray[ offset_tangent + 11 ] = t3.w;

				tangentArray[ offset_tangent + 12 ] = t4.x;
				tangentArray[ offset_tangent + 13 ] = t4.y;
				tangentArray[ offset_tangent + 14 ] = t4.z;
				tangentArray[ offset_tangent + 15 ] = t4.w;

				offset_tangent += 16;

			}

			_gl.bindBuffer( _gl.ARRAY_BUFFER, geometryGroup.__webglTangentBuffer );
			_gl.bufferData( _gl.ARRAY_BUFFER, tangentArray, hint );

		}

		if ( dirtyNormals && normalType ) {

			for ( f = 0, fl = chunk_faces3.length; f < fl; f ++ ) {

				face = obj_faces[ chunk_faces3[ f ]	];

				vertexNormals = face.vertexNormals;
				faceNormal = face.normal;

				if ( vertexNormals.length === 3 && needsSmoothNormals ) {

					for ( i = 0; i < 3; i ++ ) {

						vn = vertexNormals[ i ];

						normalArray[ offset_normal ]     = vn.x;
						normalArray[ offset_normal + 1 ] = vn.y;
						normalArray[ offset_normal + 2 ] = vn.z;

						offset_normal += 3;

					}

				} else {

					for ( i = 0; i < 3; i ++ ) {

						normalArray[ offset_normal ]     = faceNormal.x;
						normalArray[ offset_normal + 1 ] = faceNormal.y;
						normalArray[ offset_normal + 2 ] = faceNormal.z;

						offset_normal += 3;

					}

				}

			}

			for ( f = 0, fl = chunk_faces4.length; f < fl; f ++ ) {

				face = obj_faces[ chunk_faces4[ f ] ];

				vertexNormals = face.vertexNormals;
				faceNormal = face.normal;

				if ( vertexNormals.length === 4 && needsSmoothNormals ) {

					for ( i = 0; i < 4; i ++ ) {

						vn = vertexNormals[ i ];

						normalArray[ offset_normal ]     = vn.x;
						normalArray[ offset_normal + 1 ] = vn.y;
						normalArray[ offset_normal + 2 ] = vn.z;

						offset_normal += 3;

					}

				} else {

					for ( i = 0; i < 4; i ++ ) {

						normalArray[ offset_normal ]     = faceNormal.x;
						normalArray[ offset_normal + 1 ] = faceNormal.y;
						normalArray[ offset_normal + 2 ] = faceNormal.z;

						offset_normal += 3;

					}

				}

			}

			_gl.bindBuffer( _gl.ARRAY_BUFFER, geometryGroup.__webglNormalBuffer );
			_gl.bufferData( _gl.ARRAY_BUFFER, normalArray, hint );

		}

		if ( dirtyUvs && obj_uvs && uvType ) {

			for ( f = 0, fl = chunk_faces3.length; f < fl; f ++ ) {

				fi = chunk_faces3[ f ];

				face = obj_faces[ fi ];
				uv = obj_uvs[ fi ];

				if ( uv === undefined ) continue;

				for ( i = 0; i < 3; i ++ ) {

					uvi = uv[ i ];

					uvArray[ offset_uv ]     = uvi.u;
					uvArray[ offset_uv + 1 ] = uvi.v;

					offset_uv += 2;

				}

			}

			for ( f = 0, fl = chunk_faces4.length; f < fl; f ++ ) {

				fi = chunk_faces4[ f ];

				face = obj_faces[ fi ];
				uv = obj_uvs[ fi ];

				if ( uv === undefined ) continue;

				for ( i = 0; i < 4; i ++ ) {

					uvi = uv[ i ];

					uvArray[ offset_uv ]     = uvi.u;
					uvArray[ offset_uv + 1 ] = uvi.v;

					offset_uv += 2;

				}

			}

			if ( offset_uv > 0 ) {

				_gl.bindBuffer( _gl.ARRAY_BUFFER, geometryGroup.__webglUVBuffer );
				_gl.bufferData( _gl.ARRAY_BUFFER, uvArray, hint );

			}

		}

		if ( dirtyUvs && obj_uvs2 && uvType ) {

			for ( f = 0, fl = chunk_faces3.length; f < fl; f ++ ) {

				fi = chunk_faces3[ f ];

				face = obj_faces[ fi ];
				uv2 = obj_uvs2[ fi ];

				if ( uv2 === undefined ) continue;

				for ( i = 0; i < 3; i ++ ) {

					uv2i = uv2[ i ];

					uv2Array[ offset_uv2 ]     = uv2i.u;
					uv2Array[ offset_uv2 + 1 ] = uv2i.v;

					offset_uv2 += 2;

				}

			}

			for ( f = 0, fl = chunk_faces4.length; f < fl; f ++ ) {

				fi = chunk_faces4[ f ];

				face = obj_faces[ fi ];
				uv2 = obj_uvs2[ fi ];

				if ( uv2 === undefined ) continue;

				for ( i = 0; i < 4; i ++ ) {

					uv2i = uv2[ i ];

					uv2Array[ offset_uv2 ]     = uv2i.u;
					uv2Array[ offset_uv2 + 1 ] = uv2i.v;

					offset_uv2 += 2;

				}

			}

			if ( offset_uv2 > 0 ) {

				_gl.bindBuffer( _gl.ARRAY_BUFFER, geometryGroup.__webglUV2Buffer );
				_gl.bufferData( _gl.ARRAY_BUFFER, uv2Array, hint );

			}

		}

		if ( dirtyElements ) {

			for ( f = 0, fl = chunk_faces3.length; f < fl; f ++ ) {

				face = obj_faces[ chunk_faces3[ f ]	];

				faceArray[ offset_face ] 	 = vertexIndex;
				faceArray[ offset_face + 1 ] = vertexIndex + 1;
				faceArray[ offset_face + 2 ] = vertexIndex + 2;

				offset_face += 3;

				lineArray[ offset_line ]     = vertexIndex;
				lineArray[ offset_line + 1 ] = vertexIndex + 1;

				lineArray[ offset_line + 2 ] = vertexIndex;
				lineArray[ offset_line + 3 ] = vertexIndex + 2;

				lineArray[ offset_line + 4 ] = vertexIndex + 1;
				lineArray[ offset_line + 5 ] = vertexIndex + 2;

				offset_line += 6;

				vertexIndex += 3;

			}

			for ( f = 0, fl = chunk_faces4.length; f < fl; f ++ ) {

				face = obj_faces[ chunk_faces4[ f ] ];

				faceArray[ offset_face ]     = vertexIndex;
				faceArray[ offset_face + 1 ] = vertexIndex + 1;
				faceArray[ offset_face + 2 ] = vertexIndex + 3;

				faceArray[ offset_face + 3 ] = vertexIndex + 1;
				faceArray[ offset_face + 4 ] = vertexIndex + 2;
				faceArray[ offset_face + 5 ] = vertexIndex + 3;

				offset_face += 6;

				lineArray[ offset_line ]     = vertexIndex;
				lineArray[ offset_line + 1 ] = vertexIndex + 1;

				lineArray[ offset_line + 2 ] = vertexIndex;
				lineArray[ offset_line + 3 ] = vertexIndex + 3;

				lineArray[ offset_line + 4 ] = vertexIndex + 1;
				lineArray[ offset_line + 5 ] = vertexIndex + 2;

				lineArray[ offset_line + 6 ] = vertexIndex + 2;
				lineArray[ offset_line + 7 ] = vertexIndex + 3;

				offset_line += 8;

				vertexIndex += 4;

			}

			_gl.bindBuffer( _gl.ELEMENT_ARRAY_BUFFER, geometryGroup.__webglFaceBuffer );
			_gl.bufferData( _gl.ELEMENT_ARRAY_BUFFER, faceArray, hint );

			_gl.bindBuffer( _gl.ELEMENT_ARRAY_BUFFER, geometryGroup.__webglLineBuffer );
			_gl.bufferData( _gl.ELEMENT_ARRAY_BUFFER, lineArray, hint );

		}

		if ( customAttributes ) {

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

				customAttribute = customAttributes[ i ];

				if ( ! customAttribute.__original.needsUpdate ) continue;

				offset_custom = 0;
				offset_customSrc = 0;

				if ( customAttribute.size === 1 ) {

					if ( customAttribute.boundTo === undefined || customAttribute.boundTo === "vertices" ) {

						for ( f = 0, fl = chunk_faces3.length; f < fl; f ++ ) {

							face = obj_faces[ chunk_faces3[ f ]	];

							customAttribute.array[ offset_custom ] 	   = customAttribute.value[ face.a ];
							customAttribute.array[ offset_custom + 1 ] = customAttribute.value[ face.b ];
							customAttribute.array[ offset_custom + 2 ] = customAttribute.value[ face.c ];

							offset_custom += 3;

						}

						for ( f = 0, fl = chunk_faces4.length; f < fl; f ++ ) {

							face = obj_faces[ chunk_faces4[ f ] ];

							customAttribute.array[ offset_custom ] 	   = customAttribute.value[ face.a ];
							customAttribute.array[ offset_custom + 1 ] = customAttribute.value[ face.b ];
							customAttribute.array[ offset_custom + 2 ] = customAttribute.value[ face.c ];
							customAttribute.array[ offset_custom + 3 ] = customAttribute.value[ face.d ];

							offset_custom += 4;

						}

					} else if ( customAttribute.boundTo === "faces" ) {

						for ( f = 0, fl = chunk_faces3.length; f < fl; f ++ ) {

							value = customAttribute.value[ chunk_faces3[ f ] ];

							customAttribute.array[ offset_custom ] 	   = value;
							customAttribute.array[ offset_custom + 1 ] = value;
							customAttribute.array[ offset_custom + 2 ] = value;

							offset_custom += 3;

						}

						for ( f = 0, fl = chunk_faces4.length; f < fl; f ++ ) {

							value = customAttribute.value[ chunk_faces4[ f ] ];

							customAttribute.array[ offset_custom ] 	   = value;
							customAttribute.array[ offset_custom + 1 ] = value;
							customAttribute.array[ offset_custom + 2 ] = value;
							customAttribute.array[ offset_custom + 3 ] = value;

							offset_custom += 4;

						}

					}

				} else if ( customAttribute.size === 2 ) {

					if ( customAttribute.boundTo === undefined || customAttribute.boundTo === "vertices" ) {

						for ( f = 0, fl = chunk_faces3.length; f < fl; f ++ ) {

							face = obj_faces[ chunk_faces3[ f ]	];

							v1 = customAttribute.value[ face.a ];
							v2 = customAttribute.value[ face.b ];
							v3 = customAttribute.value[ face.c ];

							customAttribute.array[ offset_custom ] 	   = v1.x;
							customAttribute.array[ offset_custom + 1 ] = v1.y;

							customAttribute.array[ offset_custom + 2 ] = v2.x;
							customAttribute.array[ offset_custom + 3 ] = v2.y;

							customAttribute.array[ offset_custom + 4 ] = v3.x;
							customAttribute.array[ offset_custom + 5 ] = v3.y;

							offset_custom += 6;

						}

						for ( f = 0, fl = chunk_faces4.length; f < fl; f ++ ) {

							face = obj_faces[ chunk_faces4[ f ] ];

							v1 = customAttribute.value[ face.a ];
							v2 = customAttribute.value[ face.b ];
							v3 = customAttribute.value[ face.c ];
							v4 = customAttribute.value[ face.d ];

							customAttribute.array[ offset_custom ] 	   = v1.x;
							customAttribute.array[ offset_custom + 1 ] = v1.y;

							customAttribute.array[ offset_custom + 2 ] = v2.x;
							customAttribute.array[ offset_custom + 3 ] = v2.y;

							customAttribute.array[ offset_custom + 4 ] = v3.x;
							customAttribute.array[ offset_custom + 5 ] = v3.y;

							customAttribute.array[ offset_custom + 6 ] = v4.x;
							customAttribute.array[ offset_custom + 7 ] = v4.y;

							offset_custom += 8;

						}

					} else if ( customAttribute.boundTo === "faces" ) {

						for ( f = 0, fl = chunk_faces3.length; f < fl; f ++ ) {

							value = customAttribute.value[ chunk_faces3[ f ] ];

							v1 = value;
							v2 = value;
							v3 = value;

							customAttribute.array[ offset_custom ] 	   = v1.x;
							customAttribute.array[ offset_custom + 1 ] = v1.y;

							customAttribute.array[ offset_custom + 2 ] = v2.x;
							customAttribute.array[ offset_custom + 3 ] = v2.y;

							customAttribute.array[ offset_custom + 4 ] = v3.x;
							customAttribute.array[ offset_custom + 5 ] = v3.y;

							offset_custom += 6;

						}

						for ( f = 0, fl = chunk_faces4.length; f < fl; f ++ ) {

							value = customAttribute.value[ chunk_faces4[ f ] ];

							v1 = value;
							v2 = value;
							v3 = value;
							v4 = value;

							customAttribute.array[ offset_custom ] 	   = v1.x;
							customAttribute.array[ offset_custom + 1 ] = v1.y;

							customAttribute.array[ offset_custom + 2 ] = v2.x;
							customAttribute.array[ offset_custom + 3 ] = v2.y;

							customAttribute.array[ offset_custom + 4 ] = v3.x;
							customAttribute.array[ offset_custom + 5 ] = v3.y;

							customAttribute.array[ offset_custom + 6 ] = v4.x;
							customAttribute.array[ offset_custom + 7 ] = v4.y;

							offset_custom += 8;

						}

					}

				} else if ( customAttribute.size === 3 ) {

					var pp;

					if ( customAttribute.type === "c" ) {

						pp = [ "r", "g", "b" ];

					} else {

						pp = [ "x", "y", "z" ];

					}

					if ( customAttribute.boundTo === undefined || customAttribute.boundTo === "vertices" ) {

						for ( f = 0, fl = chunk_faces3.length; f < fl; f ++ ) {

							face = obj_faces[ chunk_faces3[ f ]	];

							v1 = customAttribute.value[ face.a ];
							v2 = customAttribute.value[ face.b ];
							v3 = customAttribute.value[ face.c ];

							customAttribute.array[ offset_custom ] 	   = v1[ pp[ 0 ] ];
							customAttribute.array[ offset_custom + 1 ] = v1[ pp[ 1 ] ];
							customAttribute.array[ offset_custom + 2 ] = v1[ pp[ 2 ] ];

							customAttribute.array[ offset_custom + 3 ] = v2[ pp[ 0 ] ];
							customAttribute.array[ offset_custom + 4 ] = v2[ pp[ 1 ] ];
							customAttribute.array[ offset_custom + 5 ] = v2[ pp[ 2 ] ];

							customAttribute.array[ offset_custom + 6 ] = v3[ pp[ 0 ] ];
							customAttribute.array[ offset_custom + 7 ] = v3[ pp[ 1 ] ];
							customAttribute.array[ offset_custom + 8 ] = v3[ pp[ 2 ] ];

							offset_custom += 9;

						}

						for ( f = 0, fl = chunk_faces4.length; f < fl; f ++ ) {

							face = obj_faces[ chunk_faces4[ f ] ];

							v1 = customAttribute.value[ face.a ];
							v2 = customAttribute.value[ face.b ];
							v3 = customAttribute.value[ face.c ];
							v4 = customAttribute.value[ face.d ];

							customAttribute.array[ offset_custom  ] 	= v1[ pp[ 0 ] ];
							customAttribute.array[ offset_custom + 1  ] = v1[ pp[ 1 ] ];
							customAttribute.array[ offset_custom + 2  ] = v1[ pp[ 2 ] ];

							customAttribute.array[ offset_custom + 3  ] = v2[ pp[ 0 ] ];
							customAttribute.array[ offset_custom + 4  ] = v2[ pp[ 1 ] ];
							customAttribute.array[ offset_custom + 5  ] = v2[ pp[ 2 ] ];

							customAttribute.array[ offset_custom + 6  ] = v3[ pp[ 0 ] ];
							customAttribute.array[ offset_custom + 7  ] = v3[ pp[ 1 ] ];
							customAttribute.array[ offset_custom + 8  ] = v3[ pp[ 2 ] ];

							customAttribute.array[ offset_custom + 9  ] = v4[ pp[ 0 ] ];
							customAttribute.array[ offset_custom + 10 ] = v4[ pp[ 1 ] ];
							customAttribute.array[ offset_custom + 11 ] = v4[ pp[ 2 ] ];

							offset_custom += 12;

						}

					} else if ( customAttribute.boundTo === "faces" ) {

						for ( f = 0, fl = chunk_faces3.length; f < fl; f ++ ) {

							value = customAttribute.value[ chunk_faces3[ f ] ];

							v1 = value;
							v2 = value;
							v3 = value;

							customAttribute.array[ offset_custom ] 	   = v1[ pp[ 0 ] ];
							customAttribute.array[ offset_custom + 1 ] = v1[ pp[ 1 ] ];
							customAttribute.array[ offset_custom + 2 ] = v1[ pp[ 2 ] ];

							customAttribute.array[ offset_custom + 3 ] = v2[ pp[ 0 ] ];
							customAttribute.array[ offset_custom + 4 ] = v2[ pp[ 1 ] ];
							customAttribute.array[ offset_custom + 5 ] = v2[ pp[ 2 ] ];

							customAttribute.array[ offset_custom + 6 ] = v3[ pp[ 0 ] ];
							customAttribute.array[ offset_custom + 7 ] = v3[ pp[ 1 ] ];
							customAttribute.array[ offset_custom + 8 ] = v3[ pp[ 2 ] ];

							offset_custom += 9;

						}

						for ( f = 0, fl = chunk_faces4.length; f < fl; f ++ ) {

							value = customAttribute.value[ chunk_faces4[ f ] ];

							v1 = value;
							v2 = value;
							v3 = value;
							v4 = value;

							customAttribute.array[ offset_custom  ] 	= v1[ pp[ 0 ] ];
							customAttribute.array[ offset_custom + 1  ] = v1[ pp[ 1 ] ];
							customAttribute.array[ offset_custom + 2  ] = v1[ pp[ 2 ] ];

							customAttribute.array[ offset_custom + 3  ] = v2[ pp[ 0 ] ];
							customAttribute.array[ offset_custom + 4  ] = v2[ pp[ 1 ] ];
							customAttribute.array[ offset_custom + 5  ] = v2[ pp[ 2 ] ];

							customAttribute.array[ offset_custom + 6  ] = v3[ pp[ 0 ] ];
							customAttribute.array[ offset_custom + 7  ] = v3[ pp[ 1 ] ];
							customAttribute.array[ offset_custom + 8  ] = v3[ pp[ 2 ] ];

							customAttribute.array[ offset_custom + 9  ] = v4[ pp[ 0 ] ];
							customAttribute.array[ offset_custom + 10 ] = v4[ pp[ 1 ] ];
							customAttribute.array[ offset_custom + 11 ] = v4[ pp[ 2 ] ];

							offset_custom += 12;

						}

					}

				} else if ( customAttribute.size === 4 ) {

					if ( customAttribute.boundTo === undefined || customAttribute.boundTo === "vertices" ) {

						for ( f = 0, fl = chunk_faces3.length; f < fl; f ++ ) {

							face = obj_faces[ chunk_faces3[ f ]	];

							v1 = customAttribute.value[ face.a ];
							v2 = customAttribute.value[ face.b ];
							v3 = customAttribute.value[ face.c ];

							customAttribute.array[ offset_custom  ] 	= v1.x;
							customAttribute.array[ offset_custom + 1  ] = v1.y;
							customAttribute.array[ offset_custom + 2  ] = v1.z;
							customAttribute.array[ offset_custom + 3  ] = v1.w;

							customAttribute.array[ offset_custom + 4  ] = v2.x;
							customAttribute.array[ offset_custom + 5  ] = v2.y;
							customAttribute.array[ offset_custom + 6  ] = v2.z;
							customAttribute.array[ offset_custom + 7  ] = v2.w;

							customAttribute.array[ offset_custom + 8  ] = v3.x;
							customAttribute.array[ offset_custom + 9  ] = v3.y;
							customAttribute.array[ offset_custom + 10 ] = v3.z;
							customAttribute.array[ offset_custom + 11 ] = v3.w;

							offset_custom += 12;

						}

						for ( f = 0, fl = chunk_faces4.length; f < fl; f ++ ) {

							face = obj_faces[ chunk_faces4[ f ] ];

							v1 = customAttribute.value[ face.a ];
							v2 = customAttribute.value[ face.b ];
							v3 = customAttribute.value[ face.c ];
							v4 = customAttribute.value[ face.d ];

							customAttribute.array[ offset_custom  ] 	= v1.x;
							customAttribute.array[ offset_custom + 1  ] = v1.y;
							customAttribute.array[ offset_custom + 2  ] = v1.z;
							customAttribute.array[ offset_custom + 3  ] = v1.w;

							customAttribute.array[ offset_custom + 4  ] = v2.x;
							customAttribute.array[ offset_custom + 5  ] = v2.y;
							customAttribute.array[ offset_custom + 6  ] = v2.z;
							customAttribute.array[ offset_custom + 7  ] = v2.w;

							customAttribute.array[ offset_custom + 8  ] = v3.x;
							customAttribute.array[ offset_custom + 9  ] = v3.y;
							customAttribute.array[ offset_custom + 10 ] = v3.z;
							customAttribute.array[ offset_custom + 11 ] = v3.w;

							customAttribute.array[ offset_custom + 12 ] = v4.x;
							customAttribute.array[ offset_custom + 13 ] = v4.y;
							customAttribute.array[ offset_custom + 14 ] = v4.z;
							customAttribute.array[ offset_custom + 15 ] = v4.w;

							offset_custom += 16;

						}

					} else if ( customAttribute.boundTo === "faces" ) {

						for ( f = 0, fl = chunk_faces3.length; f < fl; f ++ ) {

							value = customAttribute.value[ chunk_faces3[ f ] ];

							v1 = value;
							v2 = value;
							v3 = value;

							customAttribute.array[ offset_custom  ] 	= v1.x;
							customAttribute.array[ offset_custom + 1  ] = v1.y;
							customAttribute.array[ offset_custom + 2  ] = v1.z;
							customAttribute.array[ offset_custom + 3  ] = v1.w;

							customAttribute.array[ offset_custom + 4  ] = v2.x;
							customAttribute.array[ offset_custom + 5  ] = v2.y;
							customAttribute.array[ offset_custom + 6  ] = v2.z;
							customAttribute.array[ offset_custom + 7  ] = v2.w;

							customAttribute.array[ offset_custom + 8  ] = v3.x;
							customAttribute.array[ offset_custom + 9  ] = v3.y;
							customAttribute.array[ offset_custom + 10 ] = v3.z;
							customAttribute.array[ offset_custom + 11 ] = v3.w;

							offset_custom += 12;

						}

						for ( f = 0, fl = chunk_faces4.length; f < fl; f ++ ) {

							value = customAttribute.value[ chunk_faces4[ f ] ];

							v1 = value;
							v2 = value;
							v3 = value;
							v4 = value;

							customAttribute.array[ offset_custom  ] 	= v1.x;
							customAttribute.array[ offset_custom + 1  ] = v1.y;
							customAttribute.array[ offset_custom + 2  ] = v1.z;
							customAttribute.array[ offset_custom + 3  ] = v1.w;

							customAttribute.array[ offset_custom + 4  ] = v2.x;
							customAttribute.array[ offset_custom + 5  ] = v2.y;
							customAttribute.array[ offset_custom + 6  ] = v2.z;
							customAttribute.array[ offset_custom + 7  ] = v2.w;

							customAttribute.array[ offset_custom + 8  ] = v3.x;
							customAttribute.array[ offset_custom + 9  ] = v3.y;
							customAttribute.array[ offset_custom + 10 ] = v3.z;
							customAttribute.array[ offset_custom + 11 ] = v3.w;

							customAttribute.array[ offset_custom + 12 ] = v4.x;
							customAttribute.array[ offset_custom + 13 ] = v4.y;
							customAttribute.array[ offset_custom + 14 ] = v4.z;
							customAttribute.array[ offset_custom + 15 ] = v4.w;

							offset_custom += 16;

						}

					}

				}

				_gl.bindBuffer( _gl.ARRAY_BUFFER, customAttribute.buffer );
				_gl.bufferData( _gl.ARRAY_BUFFER, customAttribute.array, hint );

			}

		}

		if ( dispose ) {

			delete geometryGroup.__inittedArrays;
			delete geometryGroup.__colorArray;
			delete geometryGroup.__normalArray;
			delete geometryGroup.__tangentArray;
			delete geometryGroup.__uvArray;
			delete geometryGroup.__uv2Array;
			delete geometryGroup.__faceArray;
			delete geometryGroup.__vertexArray;
			delete geometryGroup.__lineArray;
			delete geometryGroup.__skinVertexAArray;
			delete geometryGroup.__skinVertexBArray;
			delete geometryGroup.__skinIndexArray;
			delete geometryGroup.__skinWeightArray;

		}

	};

	// Buffer rendering

	this.renderBufferImmediate = function ( object, program, shading ) {

		if ( object.hasPos && ! object.__webglVertexBuffer ) object.__webglVertexBuffer = _gl.createBuffer();
		if ( object.hasNormal && ! object.__webglNormalBuffer ) object.__webglNormalBuffer = _gl.createBuffer();
		if ( object.hasUv && ! object.__webglUvBuffer ) object.__webglUvBuffer = _gl.createBuffer();

		if ( object.hasPos ) {

			_gl.bindBuffer( _gl.ARRAY_BUFFER, object.__webglVertexBuffer );
			_gl.bufferData( _gl.ARRAY_BUFFER, object.positionArray, _gl.DYNAMIC_DRAW );
			_gl.enableVertexAttribArray( program.attributes.position );
			_gl.vertexAttribPointer( program.attributes.position, 3, _gl.FLOAT, false, 0, 0 );

		}

		if ( object.hasNormal ) {

			_gl.bindBuffer( _gl.ARRAY_BUFFER, object.__webglNormalBuffer );

			if ( shading === THREE.FlatShading ) {

				var nx, ny, nz,
					nax, nbx, ncx, nay, nby, ncy, naz, nbz, ncz,
					normalArray,
					i, il = object.count * 3;

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

					normalArray = object.normalArray;

					nax  = normalArray[ i ];
					nay  = normalArray[ i + 1 ];
					naz  = normalArray[ i + 2 ];

					nbx  = normalArray[ i + 3 ];
					nby  = normalArray[ i + 4 ];
					nbz  = normalArray[ i + 5 ];

					ncx  = normalArray[ i + 6 ];
					ncy  = normalArray[ i + 7 ];
					ncz  = normalArray[ i + 8 ];

					nx = ( nax + nbx + ncx ) / 3;
					ny = ( nay + nby + ncy ) / 3;
					nz = ( naz + nbz + ncz ) / 3;

					normalArray[ i ] 	 = nx;
					normalArray[ i + 1 ] = ny;
					normalArray[ i + 2 ] = nz;

					normalArray[ i + 3 ] = nx;
					normalArray[ i + 4 ] = ny;
					normalArray[ i + 5 ] = nz;

					normalArray[ i + 6 ] = nx;
					normalArray[ i + 7 ] = ny;
					normalArray[ i + 8 ] = nz;

				}

			}

			_gl.bufferData( _gl.ARRAY_BUFFER, object.normalArray, _gl.DYNAMIC_DRAW );
			_gl.enableVertexAttribArray( program.attributes.normal );
			_gl.vertexAttribPointer( program.attributes.normal, 3, _gl.FLOAT, false, 0, 0 );

		}

		if ( object.hasUv ) {

			_gl.bindBuffer( _gl.ARRAY_BUFFER, object.__webglUvBuffer );
			_gl.bufferData( _gl.ARRAY_BUFFER, object.uvArray, _gl.DYNAMIC_DRAW );
			_gl.enableVertexAttribArray( program.attributes.uv );
			_gl.vertexAttribPointer( program.attributes.uv, 2, _gl.FLOAT, false, 0, 0 );

		}

		_gl.drawArrays( _gl.TRIANGLES, 0, object.count );

		object.count = 0;

	};

	this.renderBufferDirect = function ( camera, lights, fog, material, geometryGroup, object ) {

		if ( material.visible === false ) return;

		var program, attributes, linewidth, primitives, a, attribute;

		program = setProgram( camera, lights, fog, material, object );

		attributes = program.attributes;

		var updateBuffers = false,
			wireframeBit = material.wireframe ? 1 : 0,
			geometryGroupHash = ( geometryGroup.id * 0xffffff ) + ( program.id * 2 ) + wireframeBit;

		if ( geometryGroupHash !== _currentGeometryGroupHash ) {

			_currentGeometryGroupHash = geometryGroupHash;
			updateBuffers = true;

		}

		// render mesh

		if ( object instanceof THREE.Mesh ) {

			var offsets = geometryGroup.offsets;

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

				if ( updateBuffers ) {

					// vertices

					_gl.bindBuffer( _gl.ARRAY_BUFFER, geometryGroup.vertexPositionBuffer );
					_gl.vertexAttribPointer( attributes.position, geometryGroup.vertexPositionBuffer.itemSize, _gl.FLOAT, false, 0, offsets[ i ].index * 4 * 3 );

					// normals

					if ( attributes.normal >= 0 && geometryGroup.vertexNormalBuffer ) {

						_gl.bindBuffer( _gl.ARRAY_BUFFER, geometryGroup.vertexNormalBuffer );
						_gl.vertexAttribPointer( attributes.normal, geometryGroup.vertexNormalBuffer.itemSize, _gl.FLOAT, false, 0, offsets[ i ].index * 4 * 3 );

					}

					// uvs

					if ( attributes.uv >= 0 && geometryGroup.vertexUvBuffer ) {

						if ( geometryGroup.vertexUvBuffer ) {

							_gl.bindBuffer( _gl.ARRAY_BUFFER, geometryGroup.vertexUvBuffer );
							_gl.vertexAttribPointer(  attributes.uv, geometryGroup.vertexUvBuffer.itemSize, _gl.FLOAT, false, 0, offsets[ i ].index * 4 * 2 );

							_gl.enableVertexAttribArray( attributes.uv );

						} else {

							_gl.disableVertexAttribArray( attributes.uv );

						}

					}

					// colors

					if ( attributes.color >= 0 && geometryGroup.vertexColorBuffer ) {

						_gl.bindBuffer( _gl.ARRAY_BUFFER, geometryGroup.vertexColorBuffer );
						_gl.vertexAttribPointer( attributes.color, geometryGroup.vertexColorBuffer.itemSize, _gl.FLOAT, false, 0, offsets[ i ].index * 4 * 4 );


					}

					_gl.bindBuffer( _gl.ELEMENT_ARRAY_BUFFER, geometryGroup.vertexIndexBuffer );

				}

				// render indexed triangles

				_gl.drawElements( _gl.TRIANGLES, offsets[ i ].count, _gl.UNSIGNED_SHORT, offsets[ i ].start * 2 ); // 2 = Uint16

				_this.info.render.calls ++;
				_this.info.render.vertices += offsets[ i ].count; // not really true, here vertices can be shared
				_this.info.render.faces += offsets[ i ].count / 3;

			}

		}

	};

	this.renderBuffer = function ( camera, lights, fog, material, geometryGroup, object ) {

		if ( material.visible === false ) return;

		var program, attributes, linewidth, primitives, a, attribute, i, il;

		program = setProgram( camera, lights, fog, material, object );

		attributes = program.attributes;

		var updateBuffers = false,
			wireframeBit = material.wireframe ? 1 : 0,
			geometryGroupHash = ( geometryGroup.id * 0xffffff ) + ( program.id * 2 ) + wireframeBit;

		if ( geometryGroupHash !== _currentGeometryGroupHash ) {

			_currentGeometryGroupHash = geometryGroupHash;
			updateBuffers = true;

		}

		// vertices

		if ( !material.morphTargets && attributes.position >= 0 ) {

			if ( updateBuffers ) {

				_gl.bindBuffer( _gl.ARRAY_BUFFER, geometryGroup.__webglVertexBuffer );
				_gl.vertexAttribPointer( attributes.position, 3, _gl.FLOAT, false, 0, 0 );

			}

		} else {

			if ( object.morphTargetBase ) {

				setupMorphTargets( material, geometryGroup, object );

			}

		}


		if ( updateBuffers ) {

			// custom attributes

			// Use the per-geometryGroup custom attribute arrays which are setup in initMeshBuffers

			if ( geometryGroup.__webglCustomAttributesList ) {

				for ( i = 0, il = geometryGroup.__webglCustomAttributesList.length; i < il; i ++ ) {

					attribute = geometryGroup.__webglCustomAttributesList[ i ];

					if( attributes[ attribute.buffer.belongsToAttribute ] >= 0 ) {

						_gl.bindBuffer( _gl.ARRAY_BUFFER, attribute.buffer );
						_gl.vertexAttribPointer( attributes[ attribute.buffer.belongsToAttribute ], attribute.size, _gl.FLOAT, false, 0, 0 );

					}

				}

			}


			// colors

			if ( attributes.color >= 0 ) {

				_gl.bindBuffer( _gl.ARRAY_BUFFER, geometryGroup.__webglColorBuffer );
				_gl.vertexAttribPointer( attributes.color, 3, _gl.FLOAT, false, 0, 0 );

			}

			// normals

			if ( attributes.normal >= 0 ) {

				_gl.bindBuffer( _gl.ARRAY_BUFFER, geometryGroup.__webglNormalBuffer );
				_gl.vertexAttribPointer( attributes.normal, 3, _gl.FLOAT, false, 0, 0 );

			}

			// tangents

			if ( attributes.tangent >= 0 ) {

				_gl.bindBuffer( _gl.ARRAY_BUFFER, geometryGroup.__webglTangentBuffer );
				_gl.vertexAttribPointer( attributes.tangent, 4, _gl.FLOAT, false, 0, 0 );

			}

			// uvs

			if ( attributes.uv >= 0 ) {

				if ( geometryGroup.__webglUVBuffer ) {

					_gl.bindBuffer( _gl.ARRAY_BUFFER, geometryGroup.__webglUVBuffer );
					_gl.vertexAttribPointer( attributes.uv, 2, _gl.FLOAT, false, 0, 0 );

					_gl.enableVertexAttribArray( attributes.uv );

				} else {

					_gl.disableVertexAttribArray( attributes.uv );

				}

			}

			if ( attributes.uv2 >= 0 ) {

				if ( geometryGroup.__webglUV2Buffer ) {

					_gl.bindBuffer( _gl.ARRAY_BUFFER, geometryGroup.__webglUV2Buffer );
					_gl.vertexAttribPointer( attributes.uv2, 2, _gl.FLOAT, false, 0, 0 );

					_gl.enableVertexAttribArray( attributes.uv2 );

				} else {

					_gl.disableVertexAttribArray( attributes.uv2 );

				}

			}

			if ( material.skinning &&
				 attributes.skinVertexA >= 0 && attributes.skinVertexB >= 0 &&
				 attributes.skinIndex >= 0 && attributes.skinWeight >= 0 ) {

				_gl.bindBuffer( _gl.ARRAY_BUFFER, geometryGroup.__webglSkinVertexABuffer );
				_gl.vertexAttribPointer( attributes.skinVertexA, 4, _gl.FLOAT, false, 0, 0 );

				_gl.bindBuffer( _gl.ARRAY_BUFFER, geometryGroup.__webglSkinVertexBBuffer );
				_gl.vertexAttribPointer( attributes.skinVertexB, 4, _gl.FLOAT, false, 0, 0 );

				_gl.bindBuffer( _gl.ARRAY_BUFFER, geometryGroup.__webglSkinIndicesBuffer );
				_gl.vertexAttribPointer( attributes.skinIndex, 4, _gl.FLOAT, false, 0, 0 );

				_gl.bindBuffer( _gl.ARRAY_BUFFER, geometryGroup.__webglSkinWeightsBuffer );
				_gl.vertexAttribPointer( attributes.skinWeight, 4, _gl.FLOAT, false, 0, 0 );

			}

		}

		// render mesh

		if ( object instanceof THREE.Mesh ) {

			// wireframe

			if ( material.wireframe ) {

				setLineWidth( material.wireframeLinewidth );

				if ( updateBuffers ) _gl.bindBuffer( _gl.ELEMENT_ARRAY_BUFFER, geometryGroup.__webglLineBuffer );
				_gl.drawElements( _gl.LINES, geometryGroup.__webglLineCount, _gl.UNSIGNED_SHORT, 0 );

			// triangles

			} else {

				if ( updateBuffers ) _gl.bindBuffer( _gl.ELEMENT_ARRAY_BUFFER, geometryGroup.__webglFaceBuffer );
				_gl.drawElements( _gl.TRIANGLES, geometryGroup.__webglFaceCount, _gl.UNSIGNED_SHORT, 0 );

			}

			_this.info.render.calls ++;
			_this.info.render.vertices += geometryGroup.__webglFaceCount;
			_this.info.render.faces += geometryGroup.__webglFaceCount / 3;

		// render lines

		} else if ( object instanceof THREE.Line ) {

			primitives = ( object.type === THREE.LineStrip ) ? _gl.LINE_STRIP : _gl.LINES;

			setLineWidth( material.linewidth );

			_gl.drawArrays( primitives, 0, geometryGroup.__webglLineCount );

			_this.info.render.calls ++;

		// render particles

		} else if ( object instanceof THREE.ParticleSystem ) {

			_gl.drawArrays( _gl.POINTS, 0, geometryGroup.__webglParticleCount );

			_this.info.render.calls ++;
			_this.info.render.points += geometryGroup.__webglParticleCount;

		// render ribbon

		} else if ( object instanceof THREE.Ribbon ) {

			_gl.drawArrays( _gl.TRIANGLE_STRIP, 0, geometryGroup.__webglVertexCount );

			_this.info.render.calls ++;

		}

	};

	function setupMorphTargets ( material, geometryGroup, object ) {

		// set base

		var attributes = material.program.attributes;

		if ( object.morphTargetBase !== -1 ) {

			_gl.bindBuffer( _gl.ARRAY_BUFFER, geometryGroup.__webglMorphTargetsBuffers[ object.morphTargetBase ] );
			_gl.vertexAttribPointer( attributes.position, 3, _gl.FLOAT, false, 0, 0 );

		} else if ( attributes.position >= 0 ) {

			_gl.bindBuffer( _gl.ARRAY_BUFFER, geometryGroup.__webglVertexBuffer );
			_gl.vertexAttribPointer( attributes.position, 3, _gl.FLOAT, false, 0, 0 );

		}

		if ( object.morphTargetForcedOrder.length ) {

			// set forced order

			var m = 0;
			var order = object.morphTargetForcedOrder;
			var influences = object.morphTargetInfluences;

			while ( m < material.numSupportedMorphTargets && m < order.length ) {

				_gl.bindBuffer( _gl.ARRAY_BUFFER, geometryGroup.__webglMorphTargetsBuffers[ order[ m ] ] );
				_gl.vertexAttribPointer( attributes[ "morphTarget" + m ], 3, _gl.FLOAT, false, 0, 0 );

				if ( material.morphNormals ) {

					_gl.bindBuffer( _gl.ARRAY_BUFFER, geometryGroup.__webglMorphNormalsBuffers[ order[ m ] ] );
					_gl.vertexAttribPointer( attributes[ "morphNormal" + m ], 3, _gl.FLOAT, false, 0, 0 );

				}

				object.__webglMorphTargetInfluences[ m ] = influences[ order[ m ] ];

				m ++;
			}

		} else {

			// find the most influencing

			var influence, activeInfluenceIndices = [];
			var influences = object.morphTargetInfluences;
			var i, il = influences.length;

			for ( i = 0; i < il; i ++ ) {

				influence = influences[ i ];

				if ( influence > 0 ) {

					activeInfluenceIndices.push( [ i, influence ] );

				}

			}

			if ( activeInfluenceIndices.length > material.numSupportedMorphTargets ) {

				activeInfluenceIndices.sort( numericalSort );
				activeInfluenceIndices.length = material.numSupportedMorphTargets;

			} else if ( activeInfluenceIndices.length > material.numSupportedMorphNormals ) {

				activeInfluenceIndices.sort( numericalSort );

			} else if ( activeInfluenceIndices.length === 0 ) {

				activeInfluenceIndices.push( [ 0, 0 ] );

			};

			var influenceIndex, m = 0;

			while ( m < material.numSupportedMorphTargets ) {

				if ( activeInfluenceIndices[ m ] ) {

					influenceIndex = activeInfluenceIndices[ m ][ 0 ];

					_gl.bindBuffer( _gl.ARRAY_BUFFER, geometryGroup.__webglMorphTargetsBuffers[ influenceIndex ] );

					_gl.vertexAttribPointer( attributes[ "morphTarget" + m ], 3, _gl.FLOAT, false, 0, 0 );

					if ( material.morphNormals ) {

						_gl.bindBuffer( _gl.ARRAY_BUFFER, geometryGroup.__webglMorphNormalsBuffers[ influenceIndex ] );
						_gl.vertexAttribPointer( attributes[ "morphNormal" + m ], 3, _gl.FLOAT, false, 0, 0 );

					}

					object.__webglMorphTargetInfluences[ m ] = influences[ influenceIndex ];

				} else {

					_gl.vertexAttribPointer( attributes[ "morphTarget" + m ], 3, _gl.FLOAT, false, 0, 0 );

					if ( material.morphNormals ) {

						_gl.vertexAttribPointer( attributes[ "morphNormal" + m ], 3, _gl.FLOAT, false, 0, 0 );

					}

					object.__webglMorphTargetInfluences[ m ] = 0;

				}

				m ++;

			}

		}

		// load updated influences uniform

		if ( material.program.uniforms.morphTargetInfluences !== null ) {

			_gl.uniform1fv( material.program.uniforms.morphTargetInfluences, object.__webglMorphTargetInfluences );

		}

	};

	// Sorting

	function painterSort ( a, b ) {

		return b.z - a.z;

	};

	function numericalSort ( a, b ) {

		return b[ 1 ] - a[ 1 ];

	};


	// Rendering

	this.render = function ( scene, camera, renderTarget, forceClear ) {

		var i, il,

		webglObject, object,
		renderList,

		lights = scene.__lights,
		fog = scene.fog;

		// reset caching for this frame

		_currentMaterialId = -1;
		_lightsNeedUpdate = true;

		// update scene graph

		if ( camera.parent === undefined ) {

			console.warn( 'DEPRECATED: Camera hasn\'t been added to a Scene. Adding it...' );
			scene.add( camera );

		}

		if ( this.autoUpdateScene ) scene.updateMatrixWorld();

		// update camera matrices and frustum

		if ( ! camera._viewMatrixArray ) camera._viewMatrixArray = new Float32Array( 16 );
		if ( ! camera._projectionMatrixArray ) camera._projectionMatrixArray = new Float32Array( 16 );

		camera.matrixWorldInverse.getInverse( camera.matrixWorld );

		camera.matrixWorldInverse.flattenToArray( camera._viewMatrixArray );
		camera.projectionMatrix.flattenToArray( camera._projectionMatrixArray );

		_projScreenMatrix.multiply( camera.projectionMatrix, camera.matrixWorldInverse );
		_frustum.setFromMatrix( _projScreenMatrix );

		// update WebGL objects

		if ( this.autoUpdateObjects ) this.initWebGLObjects( scene );

		// custom render plugins (pre pass)

		renderPlugins( this.renderPluginsPre, scene, camera );

		//

		_this.info.render.calls = 0;
		_this.info.render.vertices = 0;
		_this.info.render.faces = 0;
		_this.info.render.points = 0;

		this.setRenderTarget( renderTarget );

		if ( this.autoClear || forceClear ) {

			this.clear( this.autoClearColor, this.autoClearDepth, this.autoClearStencil );

		}

		// set matrices for regular objects (frustum culled)

		renderList = scene.__webglObjects;

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

			webglObject = renderList[ i ];
			object = webglObject.object;

			webglObject.render = false;

			if ( object.visible ) {

				if ( ! ( object instanceof THREE.Mesh || object instanceof THREE.ParticleSystem ) || ! ( object.frustumCulled ) || _frustum.contains( object ) ) {

					//object.matrixWorld.flattenToArray( object._objectMatrixArray );

					setupMatrices( object, camera );

					unrollBufferMaterial( webglObject );

					webglObject.render = true;

					if ( this.sortObjects ) {

						if ( object.renderDepth ) {

							webglObject.z = object.renderDepth;

						} else {

							_vector3.copy( object.matrixWorld.getPosition() );
							_projScreenMatrix.multiplyVector3( _vector3 );

							webglObject.z = _vector3.z;

						}

					}

				}

			}

		}

		if ( this.sortObjects ) {

			renderList.sort( painterSort );

		}

		// set matrices for immediate objects

		renderList = scene.__webglObjectsImmediate;

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

			webglObject = renderList[ i ];
			object = webglObject.object;

			if ( object.visible ) {

				/*
				if ( object.matrixAutoUpdate ) {

					object.matrixWorld.flattenToArray( object._objectMatrixArray );

				}
				*/

				setupMatrices( object, camera );

				unrollImmediateBufferMaterial( webglObject );

			}

		}

		if ( scene.overrideMaterial ) {

			var material = scene.overrideMaterial;

			this.setBlending( material.blending, material.blendEquation, material.blendSrc, material.blendDst );
			this.setDepthTest( material.depthTest );
			this.setDepthWrite( material.depthWrite );
			setPolygonOffset( material.polygonOffset, material.polygonOffsetFactor, material.polygonOffsetUnits );

			renderObjects( scene.__webglObjects, false, "", camera, lights, fog, true, material );
			renderObjectsImmediate( scene.__webglObjectsImmediate, "", camera, lights, fog, false, material );

		} else {

			// opaque pass (front-to-back order)

			this.setBlending( THREE.NormalBlending );

			renderObjects( scene.__webglObjects, true, "opaque", camera, lights, fog, false );
			renderObjectsImmediate( scene.__webglObjectsImmediate, "opaque", camera, lights, fog, false );

			// transparent pass (back-to-front order)

			renderObjects( scene.__webglObjects, false, "transparent", camera, lights, fog, true );
			renderObjectsImmediate( scene.__webglObjectsImmediate, "transparent", camera, lights, fog, true );

		}

		// custom render plugins (post pass)

		renderPlugins( this.renderPluginsPost, scene, camera );


		// Generate mipmap if we're using any kind of mipmap filtering

		if ( renderTarget && renderTarget.generateMipmaps && renderTarget.minFilter !== THREE.NearestFilter && renderTarget.minFilter !== THREE.LinearFilter ) {

			updateRenderTargetMipmap( renderTarget );

		}

		// Ensure depth buffer writing is enabled so it can be cleared on next render

		this.setDepthTest( true );
		this.setDepthWrite( true );

		// _gl.finish();

	};

	function renderPlugins( plugins, scene, camera ) {

		if ( ! plugins.length ) return;

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

			// reset state for plugin (to start from clean slate)

			_currentProgram = null;
			_currentCamera = null;

			_oldBlending = -1;
			_oldDepthTest = -1;
			_oldDepthWrite = -1;
			_oldDoubleSided = -1;
			_oldFlipSided = -1;
			_currentGeometryGroupHash = -1;
			_currentMaterialId = -1;

			_lightsNeedUpdate = true;

			plugins[ i ].render( scene, camera, _currentWidth, _currentHeight );

			// reset state after plugin (anything could have changed)

			_currentProgram = null;
			_currentCamera = null;

			_oldBlending = -1;
			_oldDepthTest = -1;
			_oldDepthWrite = -1;
			_oldDoubleSided = -1;
			_oldFlipSided = -1;
			_currentGeometryGroupHash = -1;
			_currentMaterialId = -1;

			_lightsNeedUpdate = true;

		}

	};

	function renderObjects ( renderList, reverse, materialType, camera, lights, fog, useBlending, overrideMaterial ) {

		var webglObject, object, buffer, material, start, end, delta;

		if ( reverse ) {

			start = renderList.length - 1;
			end = -1;
			delta = -1;

		} else {

			start = 0;
			end = renderList.length;
			delta = 1;
		}

		for ( var i = start; i !== end; i += delta ) {

			webglObject = renderList[ i ];

			if ( webglObject.render ) {

				object = webglObject.object;
				buffer = webglObject.buffer;

				if ( overrideMaterial ) {

					material = overrideMaterial;

				} else {

					material = webglObject[ materialType ];

					if ( ! material ) continue;

					if ( useBlending ) _this.setBlending( material.blending, material.blendEquation, material.blendSrc, material.blendDst );

					_this.setDepthTest( material.depthTest );
					_this.setDepthWrite( material.depthWrite );
					setPolygonOffset( material.polygonOffset, material.polygonOffsetFactor, material.polygonOffsetUnits );

				}

				_this.setObjectFaces( object );

				if ( buffer instanceof THREE.BufferGeometry ) {

					_this.renderBufferDirect( camera, lights, fog, material, buffer, object );

				} else {

					_this.renderBuffer( camera, lights, fog, material, buffer, object );

				}

			}

		}

	};

	function renderObjectsImmediate ( renderList, materialType, camera, lights, fog, useBlending, overrideMaterial ) {

		var webglObject, object, material, program;

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

			webglObject = renderList[ i ];
			object = webglObject.object;

			if ( object.visible ) {

				if ( overrideMaterial ) {

					material = overrideMaterial;

				} else {

					material = webglObject[ materialType ];

					if ( ! material ) continue;

					if ( useBlending ) _this.setBlending( material.blending, material.blendEquation, material.blendSrc, material.blendDst );

					_this.setDepthTest( material.depthTest );
					_this.setDepthWrite( material.depthWrite );
					setPolygonOffset( material.polygonOffset, material.polygonOffsetFactor, material.polygonOffsetUnits );

				}

				_this.renderImmediateObject( camera, lights, fog, material, object );

			}

		}

	};

	this.renderImmediateObject = function ( camera, lights, fog, material, object ) {

		var program = setProgram( camera, lights, fog, material, object );

		_currentGeometryGroupHash = -1;

		_this.setObjectFaces( object );

		if ( object.immediateRenderCallback ) {

			object.immediateRenderCallback( program, _gl, _frustum );

		} else {

			object.render( function( object ) { _this.renderBufferImmediate( object, program, material.shading ); } );

		}

	};

	function unrollImmediateBufferMaterial ( globject ) {

		var object = globject.object,
			material = object.material;

		if ( material.transparent ) {

			globject.transparent = material;
			globject.opaque = null;

		} else {

			globject.opaque = material;
			globject.transparent = null;

		}

	};

	function unrollBufferMaterial ( globject ) {

		var object = globject.object,
			buffer = globject.buffer,
			material, materialIndex, meshMaterial;

		meshMaterial = object.material;

		if ( meshMaterial instanceof THREE.MeshFaceMaterial ) {

			materialIndex = buffer.materialIndex;

			if ( materialIndex >= 0 ) {

				material = object.geometry.materials[ materialIndex ];

				if ( material.transparent ) {

					globject.transparent = material;
					globject.opaque = null;

				} else {

					globject.opaque = material;
					globject.transparent = null;

				}

			}

		} else {

			material = meshMaterial;

			if ( material ) {

				if ( material.transparent ) {

					globject.transparent = material;
					globject.opaque = null;

				} else {

					globject.opaque = material;
					globject.transparent = null;

				}

			}

		}

	};

	// Geometry splitting

	function sortFacesByMaterial ( geometry ) {

		var f, fl, face, materialIndex, vertices,
			materialHash, groupHash,
			hash_map = {};

		var numMorphTargets = geometry.morphTargets.length;
		var numMorphNormals = geometry.morphNormals.length;

		geometry.geometryGroups = {};

		for ( f = 0, fl = geometry.faces.length; f < fl; f ++ ) {

			face = geometry.faces[ f ];
			materialIndex = face.materialIndex;

			materialHash = ( materialIndex !== undefined ) ? materialIndex : -1;

			if ( hash_map[ materialHash ] === undefined ) {

				hash_map[ materialHash ] = { 'hash': materialHash, 'counter': 0 };

			}

			groupHash = hash_map[ materialHash ].hash + '_' + hash_map[ materialHash ].counter;

			if ( geometry.geometryGroups[ groupHash ] === undefined ) {

				geometry.geometryGroups[ groupHash ] = { 'faces3': [], 'faces4': [], 'materialIndex': materialIndex, 'vertices': 0, 'numMorphTargets': numMorphTargets, 'numMorphNormals': numMorphNormals };

			}

			vertices = face instanceof THREE.Face3 ? 3 : 4;

			if ( geometry.geometryGroups[ groupHash ].vertices + vertices > 65535 ) {

				hash_map[ materialHash ].counter += 1;
				groupHash = hash_map[ materialHash ].hash + '_' + hash_map[ materialHash ].counter;

				if ( geometry.geometryGroups[ groupHash ] === undefined ) {

					geometry.geometryGroups[ groupHash ] = { 'faces3': [], 'faces4': [], 'materialIndex': materialIndex, 'vertices': 0, 'numMorphTargets': numMorphTargets, 'numMorphNormals': numMorphNormals };

				}

			}

			if ( face instanceof THREE.Face3 ) {

				geometry.geometryGroups[ groupHash ].faces3.push( f );

			} else {

				geometry.geometryGroups[ groupHash ].faces4.push( f );

			}

			geometry.geometryGroups[ groupHash ].vertices += vertices;

		}

		geometry.geometryGroupsList = [];

		for ( var g in geometry.geometryGroups ) {

			geometry.geometryGroups[ g ].id = _geometryGroupCounter ++;

			geometry.geometryGroupsList.push( geometry.geometryGroups[ g ] );

		}

	};

	// Objects refresh

	this.initWebGLObjects = function ( scene ) {

		if ( !scene.__webglObjects ) {

			scene.__webglObjects = [];
			scene.__webglObjectsImmediate = [];
			scene.__webglSprites = [];
			scene.__webglFlares = [];

		}

		while ( scene.__objectsAdded.length ) {

			addObject( scene.__objectsAdded[ 0 ], scene );
			scene.__objectsAdded.splice( 0, 1 );

		}

		while ( scene.__objectsRemoved.length ) {

			removeObject( scene.__objectsRemoved[ 0 ], scene );
			scene.__objectsRemoved.splice( 0, 1 );

		}

		// update must be called after objects adding / removal

		for ( var o = 0, ol = scene.__webglObjects.length; o < ol; o ++ ) {

			updateObject( scene.__webglObjects[ o ].object );

		}

	};

	// Objects adding

	function addObject ( object, scene ) {

		var g, geometry, geometryGroup;

		if ( ! object.__webglInit ) {

			object.__webglInit = true;

			object._modelViewMatrix = new THREE.Matrix4();
			object._normalMatrix = new THREE.Matrix3();

			//object._normalMatrixArray = new Float32Array( 9 );
			//object._modelViewMatrixArray = new Float32Array( 16 );
			//object._objectMatrixArray = new Float32Array( 16 );

			//object.matrixWorld.flattenToArray( object._objectMatrixArray );

			if ( object instanceof THREE.Mesh ) {

				geometry = object.geometry;

				if ( geometry instanceof THREE.Geometry ) {

					if ( geometry.geometryGroups === undefined ) {

						sortFacesByMaterial( geometry );

					}

					// create separate VBOs per geometry chunk

					for ( g in geometry.geometryGroups ) {

						geometryGroup = geometry.geometryGroups[ g ];

						// initialise VBO on the first access

						if ( ! geometryGroup.__webglVertexBuffer ) {

							createMeshBuffers( geometryGroup );
							initMeshBuffers( geometryGroup, object );

							geometry.verticesNeedUpdate = true;
							geometry.morphTargetsNeedUpdate = true;
							geometry.elementsNeedUpdate = true;
							geometry.uvsNeedUpdate = true;
							geometry.normalsNeedUpdate = true;
							geometry.tangetsNeedUpdate = true;
							geometry.colorsNeedUpdate = true;

						}

					}

				}

			} else if ( object instanceof THREE.Ribbon ) {

				geometry = object.geometry;

				if( ! geometry.__webglVertexBuffer ) {

					createRibbonBuffers( geometry );
					initRibbonBuffers( geometry );

					geometry.verticesNeedUpdate = true;
					geometry.colorsNeedUpdate = true;

				}

			} else if ( object instanceof THREE.Line ) {

				geometry = object.geometry;

				if( ! geometry.__webglVertexBuffer ) {

					createLineBuffers( geometry );
					initLineBuffers( geometry, object );

					geometry.verticesNeedUpdate = true;
					geometry.colorsNeedUpdate = true;

				}

			} else if ( object instanceof THREE.ParticleSystem ) {

				geometry = object.geometry;

				if ( ! geometry.__webglVertexBuffer ) {

					createParticleBuffers( geometry );
					initParticleBuffers( geometry, object );

					geometry.verticesNeedUpdate = true;
					geometry.colorsNeedUpdate = true;

				}

			}

		}

		if ( ! object.__webglActive ) {

			if ( object instanceof THREE.Mesh ) {

				geometry = object.geometry;

				if ( geometry instanceof THREE.BufferGeometry ) {

					addBuffer( scene.__webglObjects, geometry, object );

				} else {

					for ( g in geometry.geometryGroups ) {

						geometryGroup = geometry.geometryGroups[ g ];

						addBuffer( scene.__webglObjects, geometryGroup, object );

					}

				}

			} else if ( object instanceof THREE.Ribbon ||
						object instanceof THREE.Line ||
						object instanceof THREE.ParticleSystem ) {

				geometry = object.geometry;
				addBuffer( scene.__webglObjects, geometry, object );

			} else if ( object instanceof THREE.ImmediateRenderObject || object.immediateRenderCallback ) {

				addBufferImmediate( scene.__webglObjectsImmediate, object );

			} else if ( object instanceof THREE.Sprite ) {

				scene.__webglSprites.push( object );

			} else if ( object instanceof THREE.LensFlare ) {

				scene.__webglFlares.push( object );

			}

			object.__webglActive = true;

		}

	};

	function addBuffer ( objlist, buffer, object ) {

		objlist.push(
			{
				buffer: buffer,
				object: object,
				opaque: null,
				transparent: null
			}
		);

	};

	function addBufferImmediate ( objlist, object ) {

		objlist.push(
			{
				object: object,
				opaque: null,
				transparent: null
			}
		);

	};

	// Objects updates

	function updateObject ( object ) {

		var geometry = object.geometry,
			geometryGroup, customAttributesDirty, material;

		if ( object instanceof THREE.Mesh ) {

			if ( geometry instanceof THREE.BufferGeometry ) {

				/*
				if ( geometry.verticesNeedUpdate || geometry.elementsNeedUpdate ||
					 geometry.uvsNeedUpdate || geometry.normalsNeedUpdate ||
					 geometry.colorsNeedUpdate  ) {

					// TODO
					// set buffers from typed arrays

				}
				*/

				geometry.verticesNeedUpdate = false;
				geometry.elementsNeedUpdate = false;
				geometry.uvsNeedUpdate = false;
				geometry.normalsNeedUpdate = false;
				geometry.colorsNeedUpdate = false;

			} else {

				// check all geometry groups

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

					geometryGroup = geometry.geometryGroupsList[ i ];

					material = getBufferMaterial( object, geometryGroup );

					customAttributesDirty = material.attributes && areCustomAttributesDirty( material );

					if ( geometry.verticesNeedUpdate || geometry.morphTargetsNeedUpdate || geometry.elementsNeedUpdate ||
						 geometry.uvsNeedUpdate || geometry.normalsNeedUpdate ||
						 geometry.colorsNeedUpdate || geometry.tangetsNeedUpdate || customAttributesDirty ) {

						setMeshBuffers( geometryGroup, object, _gl.DYNAMIC_DRAW, !geometry.dynamic, material );

					}

				}

				geometry.verticesNeedUpdate = false;
				geometry.morphTargetsNeedUpdate = false;
				geometry.elementsNeedUpdate = false;
				geometry.uvsNeedUpdate = false;
				geometry.normalsNeedUpdate = false;
				geometry.colorsNeedUpdate = false;
				geometry.tangetsNeedUpdate = false;

				material.attributes && clearCustomAttributes( material );

			}

		} else if ( object instanceof THREE.Ribbon ) {

			if ( geometry.verticesNeedUpdate || geometry.colorsNeedUpdate ) {

				setRibbonBuffers( geometry, _gl.DYNAMIC_DRAW );

			}

			geometry.verticesNeedUpdate = false;
			geometry.colorsNeedUpdate = false;

		} else if ( object instanceof THREE.Line ) {

			material = getBufferMaterial( object, geometryGroup );

			customAttributesDirty = material.attributes && areCustomAttributesDirty( material );

			if ( geometry.verticesNeedUpdate ||  geometry.colorsNeedUpdate || customAttributesDirty ) {

				setLineBuffers( geometry, _gl.DYNAMIC_DRAW );

			}

			geometry.verticesNeedUpdate = false;
			geometry.colorsNeedUpdate = false;

			material.attributes && clearCustomAttributes( material );

		} else if ( object instanceof THREE.ParticleSystem ) {

			material = getBufferMaterial( object, geometryGroup );

			customAttributesDirty = material.attributes && areCustomAttributesDirty( material );

			if ( geometry.verticesNeedUpdate || geometry.colorsNeedUpdate || object.sortParticles || customAttributesDirty ) {

				setParticleBuffers( geometry, _gl.DYNAMIC_DRAW, object );

			}

			geometry.verticesNeedUpdate = false;
			geometry.colorsNeedUpdate = false;

			material.attributes && clearCustomAttributes( material );

		}

	};

	// Objects updates - custom attributes check

	function areCustomAttributesDirty ( material ) {

		for ( var a in material.attributes ) {

			if ( material.attributes[ a ].needsUpdate ) return true;

		}

		return false;

	};

	function clearCustomAttributes ( material ) {

		for ( var a in material.attributes ) {

			material.attributes[ a ].needsUpdate = false;

		}

	};

	// Objects removal

	function removeObject ( object, scene ) {

		if ( object instanceof THREE.Mesh  ||
			 object instanceof THREE.ParticleSystem ||
			 object instanceof THREE.Ribbon ||
			 object instanceof THREE.Line ) {

			removeInstances( scene.__webglObjects, object );

		} else if ( object instanceof THREE.Sprite ) {

			removeInstancesDirect( scene.__webglSprites, object );

		} else if ( object instanceof THREE.LensFlare ) {

			removeInstancesDirect( scene.__webglFlares, object );

		} else if ( object instanceof THREE.ImmediateRenderObject || object.immediateRenderCallback ) {

			removeInstances( scene.__webglObjectsImmediate, object );

		}

		object.__webglActive = false;

	};

	function removeInstances ( objlist, object ) {

		for ( var o = objlist.length - 1; o >= 0; o -- ) {

			if ( objlist[ o ].object === object ) {

				objlist.splice( o, 1 );

			}

		}

	};

	function removeInstancesDirect ( objlist, object ) {

		for ( var o = objlist.length - 1; o >= 0; o -- ) {

			if ( objlist[ o ] === object ) {

				objlist.splice( o, 1 );

			}

		}

	};

	// Materials

	this.initMaterial = function ( material, lights, fog, object ) {

		var u, a, identifiers, i, parameters, maxLightCount, maxBones, maxShadows, shaderID;

		if ( material instanceof THREE.MeshDepthMaterial ) {

			shaderID = 'depth';

		} else if ( material instanceof THREE.MeshNormalMaterial ) {

			shaderID = 'normal';

		} else if ( material instanceof THREE.MeshBasicMaterial ) {

			shaderID = 'basic';

		} else if ( material instanceof THREE.MeshLambertMaterial ) {

			shaderID = 'lambert';

		} else if ( material instanceof THREE.MeshPhongMaterial ) {

			shaderID = 'phong';

		} else if ( material instanceof THREE.LineBasicMaterial ) {

			shaderID = 'basic';

		} else if ( material instanceof THREE.ParticleBasicMaterial ) {

			shaderID = 'particle_basic';

		}

		if ( shaderID ) {

			setMaterialShaders( material, THREE.ShaderLib[ shaderID ] );

		}

		// heuristics to create shader parameters according to lights in the scene
		// (not to blow over maxLights budget)

		maxLightCount = allocateLights( lights );

		maxShadows = allocateShadows( lights );

		maxBones = allocateBones( object );

		parameters = {

			map: !!material.map,
			envMap: !!material.envMap,
			lightMap: !!material.lightMap,

			vertexColors: material.vertexColors,

			fog: fog,
			useFog: material.fog,

			sizeAttenuation: material.sizeAttenuation,

			skinning: material.skinning,
			maxBones: maxBones,

			morphTargets: material.morphTargets,
			morphNormals: material.morphNormals,
			maxMorphTargets: this.maxMorphTargets,
			maxMorphNormals: this.maxMorphNormals,

			maxDirLights: maxLightCount.directional,
			maxPointLights: maxLightCount.point,
			maxSpotLights: maxLightCount.spot,

			maxShadows: maxShadows,
			shadowMapEnabled: this.shadowMapEnabled && object.receiveShadow,
			shadowMapSoft: this.shadowMapSoft,
			shadowMapDebug: this.shadowMapDebug,
			shadowMapCascade: this.shadowMapCascade,

			alphaTest: material.alphaTest,
			metal: material.metal,
			perPixel: material.perPixel,
			wrapAround: material.wrapAround,
			doubleSided: object && object.doubleSided

		};

		material.program = buildProgram( shaderID, material.fragmentShader, material.vertexShader, material.uniforms, material.attributes, parameters );

		var attributes = material.program.attributes;

		if ( attributes.position >= 0 ) _gl.enableVertexAttribArray( attributes.position );
		if ( attributes.color >= 0 ) _gl.enableVertexAttribArray( attributes.color );
		if ( attributes.normal >= 0 ) _gl.enableVertexAttribArray( attributes.normal );
		if ( attributes.tangent >= 0 ) _gl.enableVertexAttribArray( attributes.tangent );

		if ( material.skinning &&
			 attributes.skinVertexA >=0 && attributes.skinVertexB >= 0 &&
			 attributes.skinIndex >= 0 && attributes.skinWeight >= 0 ) {

			_gl.enableVertexAttribArray( attributes.skinVertexA );
			_gl.enableVertexAttribArray( attributes.skinVertexB );
			_gl.enableVertexAttribArray( attributes.skinIndex );
			_gl.enableVertexAttribArray( attributes.skinWeight );

		}

		if ( material.attributes ) {

			for ( a in material.attributes ) {

				if( attributes[ a ] !== undefined && attributes[ a ] >= 0 ) _gl.enableVertexAttribArray( attributes[ a ] );

			}

		}

		if ( material.morphTargets ) {

			material.numSupportedMorphTargets = 0;

			var id, base = "morphTarget";

			for ( i = 0; i < this.maxMorphTargets; i ++ ) {

				id = base + i;

				if ( attributes[ id ] >= 0 ) {

					_gl.enableVertexAttribArray( attributes[ id ] );
					material.numSupportedMorphTargets ++;

				}

			}

		}

		if ( material.morphNormals ) {

			material.numSupportedMorphNormals = 0;

			var id, base = "morphNormal";

			for ( i = 0; i < this.maxMorphNormals; i ++ ) {

				id = base + i;

				if ( attributes[ id ] >= 0 ) {

					_gl.enableVertexAttribArray( attributes[ id ] );
					material.numSupportedMorphNormals ++;

				}

			}

		}

		material.uniformsList = [];

		for ( u in material.uniforms ) {

			material.uniformsList.push( [ material.uniforms[ u ], u ] );

		}

	};

	function setMaterialShaders( material, shaders ) {

		material.uniforms = THREE.UniformsUtils.clone( shaders.uniforms );
		material.vertexShader = shaders.vertexShader;
		material.fragmentShader = shaders.fragmentShader;

	};

	function setProgram( camera, lights, fog, material, object ) {

		if ( material.needsUpdate ) {

			if ( material.program ) _this.deallocateMaterial( material );

			_this.initMaterial( material, lights, fog, object );
			material.needsUpdate = false;

		}

		if ( material.morphTargets ) {

			if ( ! object.__webglMorphTargetInfluences ) {

				object.__webglMorphTargetInfluences = new Float32Array( _this.maxMorphTargets );

				for ( var i = 0, il = _this.maxMorphTargets; i < il; i ++ ) {

					object.__webglMorphTargetInfluences[ i ] = 0;

				}

			}

		}

		var refreshMaterial = false;

		var program = material.program,
			p_uniforms = program.uniforms,
			m_uniforms = material.uniforms;

		if ( program !== _currentProgram ) {

			_gl.useProgram( program );
			_currentProgram = program;

			refreshMaterial = true;

		}

		if ( material.id !== _currentMaterialId ) {

			_currentMaterialId = material.id;
			refreshMaterial = true;

		}

		if ( refreshMaterial || camera !== _currentCamera ) {

			_gl.uniformMatrix4fv( p_uniforms.projectionMatrix, false, camera._projectionMatrixArray );

			if ( camera !== _currentCamera ) _currentCamera = camera;

		}

		if ( refreshMaterial ) {

			// refresh uniforms common to several materials

			if ( fog && material.fog ) {

				refreshUniformsFog( m_uniforms, fog );

			}

			if ( material instanceof THREE.MeshPhongMaterial ||
				 material instanceof THREE.MeshLambertMaterial ||
				 material.lights ) {

				if ( _lightsNeedUpdate ) {

					setupLights( program, lights );
					_lightsNeedUpdate = false;

				}

				refreshUniformsLights( m_uniforms, _lights );

			}

			if ( material instanceof THREE.MeshBasicMaterial ||
				 material instanceof THREE.MeshLambertMaterial ||
				 material instanceof THREE.MeshPhongMaterial ) {

				refreshUniformsCommon( m_uniforms, material );

			}

			// refresh single material specific uniforms

			if ( material instanceof THREE.LineBasicMaterial ) {

				refreshUniformsLine( m_uniforms, material );

			} else if ( material instanceof THREE.ParticleBasicMaterial ) {

				refreshUniformsParticle( m_uniforms, material );

			} else if ( material instanceof THREE.MeshPhongMaterial ) {

				refreshUniformsPhong( m_uniforms, material );

			} else if ( material instanceof THREE.MeshLambertMaterial ) {

				refreshUniformsLambert( m_uniforms, material );

			} else if ( material instanceof THREE.MeshDepthMaterial ) {

				m_uniforms.mNear.value = camera.near;
				m_uniforms.mFar.value = camera.far;
				m_uniforms.opacity.value = material.opacity;

			} else if ( material instanceof THREE.MeshNormalMaterial ) {

				m_uniforms.opacity.value = material.opacity;

			}

			if ( object.receiveShadow && ! material._shadowPass ) {

				refreshUniformsShadow( m_uniforms, lights );

			}

			// load common uniforms

			loadUniformsGeneric( program, material.uniformsList );

			// load material specific uniforms
			// (shader material also gets them for the sake of genericity)

			if ( material instanceof THREE.ShaderMaterial ||
				 material instanceof THREE.MeshPhongMaterial ||
				 material.envMap ) {

				if ( p_uniforms.cameraPosition !== null ) {

					var position = camera.matrixWorld.getPosition();
					_gl.uniform3f( p_uniforms.cameraPosition, position.x, position.y, position.z );

				}

			}

			if ( material instanceof THREE.MeshPhongMaterial ||
				 material instanceof THREE.MeshLambertMaterial ||
				 material instanceof THREE.ShaderMaterial ||
				 material.skinning ) {

				if ( p_uniforms.viewMatrix !== null ) {

					_gl.uniformMatrix4fv( p_uniforms.viewMatrix, false, camera._viewMatrixArray );

				}

			}

			if ( material.skinning ) {

				_gl.uniformMatrix4fv( p_uniforms.boneGlobalMatrices, false, object.boneMatrices );

			}

		}

		loadUniformsMatrices( p_uniforms, object );

		if ( p_uniforms.objectMatrix !== null ) {

			_gl.uniformMatrix4fv( p_uniforms.objectMatrix, false, object.matrixWorld.elements );

		}

		return program;

	};

	// Uniforms (refresh uniforms objects)

	function refreshUniformsCommon ( uniforms, material ) {

		uniforms.opacity.value = material.opacity;

		if ( _this.gammaInput ) {

			uniforms.diffuse.value.copyGammaToLinear( material.color );

		} else {

			uniforms.diffuse.value = material.color;

		}

		uniforms.map.texture = material.map;

		if ( material.map ) {

			uniforms.offsetRepeat.value.set( material.map.offset.x, material.map.offset.y, material.map.repeat.x, material.map.repeat.y );

		}

		uniforms.lightMap.texture = material.lightMap;

		uniforms.envMap.texture = material.envMap;
		uniforms.flipEnvMap.value = ( material.envMap instanceof THREE.WebGLRenderTargetCube ) ? 1 : -1;

		if ( _this.gammaInput ) {

			//uniforms.reflectivity.value = material.reflectivity * material.reflectivity;
			uniforms.reflectivity.value = material.reflectivity;

		} else {

			uniforms.reflectivity.value = material.reflectivity;

		}

		uniforms.refractionRatio.value = material.refractionRatio;
		uniforms.combine.value = material.combine;
		uniforms.useRefract.value = material.envMap && material.envMap.mapping instanceof THREE.CubeRefractionMapping;

	};

	function refreshUniformsLine ( uniforms, material ) {

		uniforms.diffuse.value = material.color;
		uniforms.opacity.value = material.opacity;

	};

	function refreshUniformsParticle ( uniforms, material ) {

		uniforms.psColor.value = material.color;
		uniforms.opacity.value = material.opacity;
		uniforms.size.value = material.size;
		uniforms.scale.value = _canvas.height / 2.0; // TODO: Cache this.

		uniforms.map.texture = material.map;

	};

	function refreshUniformsFog ( uniforms, fog ) {

		uniforms.fogColor.value = fog.color;

		if ( fog instanceof THREE.Fog ) {

			uniforms.fogNear.value = fog.near;
			uniforms.fogFar.value = fog.far;

		} else if ( fog instanceof THREE.FogExp2 ) {

			uniforms.fogDensity.value = fog.density;

		}

	};

	function refreshUniformsPhong ( uniforms, material ) {

		uniforms.shininess.value = material.shininess;

		if ( _this.gammaInput ) {

			uniforms.ambient.value.copyGammaToLinear( material.ambient );
			uniforms.emissive.value.copyGammaToLinear( material.emissive );
			uniforms.specular.value.copyGammaToLinear( material.specular );

		} else {

			uniforms.ambient.value = material.ambient;
			uniforms.emissive.value = material.emissive;
			uniforms.specular.value = material.specular;

		}

		if ( material.wrapAround ) {

			uniforms.wrapRGB.value.copy( material.wrapRGB );

		}

	};

	function refreshUniformsLambert ( uniforms, material ) {

		if ( _this.gammaInput ) {

			uniforms.ambient.value.copyGammaToLinear( material.ambient );
			uniforms.emissive.value.copyGammaToLinear( material.emissive );

		} else {

			uniforms.ambient.value = material.ambient;
			uniforms.emissive.value = material.emissive;

		}

		if ( material.wrapAround ) {

			uniforms.wrapRGB.value.copy( material.wrapRGB );

		}

	};

	function refreshUniformsLights ( uniforms, lights ) {

		uniforms.ambientLightColor.value = lights.ambient;

		uniforms.directionalLightColor.value = lights.directional.colors;
		uniforms.directionalLightDirection.value = lights.directional.positions;

		uniforms.pointLightColor.value = lights.point.colors;
		uniforms.pointLightPosition.value = lights.point.positions;
		uniforms.pointLightDistance.value = lights.point.distances;

		uniforms.spotLightColor.value = lights.spot.colors;
		uniforms.spotLightPosition.value = lights.spot.positions;
		uniforms.spotLightDistance.value = lights.spot.distances;
		uniforms.spotLightDirection.value = lights.spot.directions;
		uniforms.spotLightAngle.value = lights.spot.angles;
		uniforms.spotLightExponent.value = lights.spot.exponents;

	};

	function refreshUniformsShadow ( uniforms, lights ) {

		if ( uniforms.shadowMatrix ) {

			var j = 0;

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

				var light = lights[ i ];

				if ( ! light.castShadow ) continue;

				if ( light instanceof THREE.SpotLight || ( light instanceof THREE.DirectionalLight && ! light.shadowCascade ) ) {

					uniforms.shadowMap.texture[ j ] = light.shadowMap;
					uniforms.shadowMapSize.value[ j ] = light.shadowMapSize;

					uniforms.shadowMatrix.value[ j ] = light.shadowMatrix;

					uniforms.shadowDarkness.value[ j ] = light.shadowDarkness;
					uniforms.shadowBias.value[ j ] = light.shadowBias;

					j ++;

				}

			}

		}

	};

	// Uniforms (load to GPU)

	function loadUniformsMatrices ( uniforms, object ) {

		_gl.uniformMatrix4fv( uniforms.modelViewMatrix, false, object._modelViewMatrix.elements );

		if ( uniforms.normalMatrix ) {

			_gl.uniformMatrix3fv( uniforms.normalMatrix, false, object._normalMatrix.elements );

		}

	};

	function loadUniformsGeneric ( program, uniforms ) {

		var uniform, value, type, location, texture, i, il, j, jl, offset;

		for ( j = 0, jl = uniforms.length; j < jl; j ++ ) {

			location = program.uniforms[ uniforms[ j ][ 1 ] ];
			if ( !location ) continue;

			uniform = uniforms[ j ][ 0 ];

			type = uniform.type;
			value = uniform.value;

			switch ( type ) {

				case "i": // single integer

					_gl.uniform1i( location, value );

					break;

				case "f": // single float

					_gl.uniform1f( location, value );

					break;

				case "v2": // single THREE.Vector2

					_gl.uniform2f( location, value.x, value.y );

					break;

				case "v3": // single THREE.Vector3

					_gl.uniform3f( location, value.x, value.y, value.z );

					break;

				case "v4": // single THREE.Vector4

					_gl.uniform4f( location, value.x, value.y, value.z, value.w );

					break;

				case "c": // single THREE.Color

					_gl.uniform3f( location, value.r, value.g, value.b );

					break;

				case "fv1": // flat array of floats (JS or typed array)

					_gl.uniform1fv( location, value );

					break;

				case "fv": // flat array of floats with 3 x N size (JS or typed array)

					_gl.uniform3fv( location, value );

					break;

				case "v2v": // array of THREE.Vector2

					if ( ! uniform._array ) {

						uniform._array = new Float32Array( 2 * value.length );

					}

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

						offset = i * 2;

						uniform._array[ offset ] 	 = value[ i ].x;
						uniform._array[ offset + 1 ] = value[ i ].y;

					}

					_gl.uniform2fv( location, uniform._array );

					break;

				case "v3v": // array of THREE.Vector3

					if ( ! uniform._array ) {

						uniform._array = new Float32Array( 3 * value.length );

					}

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

						offset = i * 3;

						uniform._array[ offset ] 	 = value[ i ].x;
						uniform._array[ offset + 1 ] = value[ i ].y;
						uniform._array[ offset + 2 ] = value[ i ].z;

					}

					_gl.uniform3fv( location, uniform._array );

					break;

				case "v4v": // array of THREE.Vector4

					if ( ! uniform._array ) {

						uniform._array = new Float32Array( 4 * value.length );

					}

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

						offset = i * 4;

						uniform._array[ offset ] 	 = value[ i ].x;
						uniform._array[ offset + 1 ] = value[ i ].y;
						uniform._array[ offset + 2 ] = value[ i ].z;
						uniform._array[ offset + 3 ] = value[ i ].w;

					}

					_gl.uniform4fv( location, uniform._array );

					break;

				case "m4": // single THREE.Matrix4

					if ( ! uniform._array ) {

						uniform._array = new Float32Array( 16 );

					}

					value.flattenToArray( uniform._array );
					_gl.uniformMatrix4fv( location, false, uniform._array );

					break;

				case "m4v": // array of THREE.Matrix4

					if ( ! uniform._array ) {

						uniform._array = new Float32Array( 16 * value.length );

					}

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

						value[ i ].flattenToArrayOffset( uniform._array, i * 16 );

					}

					_gl.uniformMatrix4fv( location, false, uniform._array );

					break;

				case "t": // single THREE.Texture (2d or cube)

					_gl.uniform1i( location, value );

					texture = uniform.texture;

					if ( !texture ) continue;

					if ( texture.image instanceof Array && texture.image.length === 6 ) {

						setCubeTexture( texture, value );

					} else if ( texture instanceof THREE.WebGLRenderTargetCube ) {

						setCubeTextureDynamic( texture, value );

					} else {

						_this.setTexture( texture, value );

					}

					break;

				case "tv": // array of THREE.Texture (2d)

					if ( ! uniform._array ) {

						uniform._array = [];

						for( i = 0, il = uniform.texture.length; i < il; i ++ ) {

							uniform._array[ i ] = value + i;

						}

					}

					_gl.uniform1iv( location, uniform._array );

					for( i = 0, il = uniform.texture.length; i < il; i ++ ) {

						texture = uniform.texture[ i ];

						if ( !texture ) continue;

						_this.setTexture( texture, uniform._array[ i ] );

					}

					break;

			}

		}

	};

	function setupMatrices ( object, camera ) {

		object._modelViewMatrix.multiply( camera.matrixWorldInverse, object.matrixWorld);

		object._normalMatrix.getInverse( object._modelViewMatrix );
		object._normalMatrix.transpose();

	};

	function setupLights ( program, lights ) {

		var l, ll, light, n,
		r = 0, g = 0, b = 0,
		color, position, intensity, distance,

		zlights = _lights,

		dcolors = zlights.directional.colors,
		dpositions = zlights.directional.positions,

		pcolors = zlights.point.colors,
		ppositions = zlights.point.positions,
		pdistances = zlights.point.distances,

		scolors = zlights.spot.colors,
		spositions = zlights.spot.positions,
		sdistances = zlights.spot.distances,
		sdirections = zlights.spot.directions,
		sangles = zlights.spot.angles,
		sexponents = zlights.spot.exponents,

		dlength = 0,
		plength = 0,
		slength = 0,

		doffset = 0,
		poffset = 0,
		soffset = 0;

		for ( l = 0, ll = lights.length; l < ll; l ++ ) {

			light = lights[ l ];

			if ( light.onlyShadow ) continue;

			color = light.color;
			intensity = light.intensity;
			distance = light.distance;

			if ( light instanceof THREE.AmbientLight ) {

				if ( _this.gammaInput ) {

					r += color.r * color.r;
					g += color.g * color.g;
					b += color.b * color.b;

				} else {

					r += color.r;
					g += color.g;
					b += color.b;

				}

			} else if ( light instanceof THREE.DirectionalLight ) {

				doffset = dlength * 3;

				if ( _this.gammaInput ) {

					dcolors[ doffset ]     = color.r * color.r * intensity * intensity;
					dcolors[ doffset + 1 ] = color.g * color.g * intensity * intensity;
					dcolors[ doffset + 2 ] = color.b * color.b * intensity * intensity;

				} else {

					dcolors[ doffset ]     = color.r * intensity;
					dcolors[ doffset + 1 ] = color.g * intensity;
					dcolors[ doffset + 2 ] = color.b * intensity;

				}

				_direction.copy( light.matrixWorld.getPosition() );
				_direction.subSelf( light.target.matrixWorld.getPosition() );
				_direction.normalize();

				dpositions[ doffset ]     = _direction.x;
				dpositions[ doffset + 1 ] = _direction.y;
				dpositions[ doffset + 2 ] = _direction.z;

				dlength += 1;

			} else if( light instanceof THREE.PointLight ) {

				poffset = plength * 3;

				if ( _this.gammaInput ) {

					pcolors[ poffset ]     = color.r * color.r * intensity * intensity;
					pcolors[ poffset + 1 ] = color.g * color.g * intensity * intensity;
					pcolors[ poffset + 2 ] = color.b * color.b * intensity * intensity;

				} else {

					pcolors[ poffset ]     = color.r * intensity;
					pcolors[ poffset + 1 ] = color.g * intensity;
					pcolors[ poffset + 2 ] = color.b * intensity;

				}

				position = light.matrixWorld.getPosition();

				ppositions[ poffset ]     = position.x;
				ppositions[ poffset + 1 ] = position.y;
				ppositions[ poffset + 2 ] = position.z;

				pdistances[ plength ] = distance;

				plength += 1;

			} else if( light instanceof THREE.SpotLight ) {

				soffset = slength * 3;

				if ( _this.gammaInput ) {

					scolors[ soffset ]     = color.r * color.r * intensity * intensity;
					scolors[ soffset + 1 ] = color.g * color.g * intensity * intensity;
					scolors[ soffset + 2 ] = color.b * color.b * intensity * intensity;

				} else {

					scolors[ soffset ]     = color.r * intensity;
					scolors[ soffset + 1 ] = color.g * intensity;
					scolors[ soffset + 2 ] = color.b * intensity;

				}

				position = light.matrixWorld.getPosition();

				spositions[ soffset ]     = position.x;
				spositions[ soffset + 1 ] = position.y;
				spositions[ soffset + 2 ] = position.z;

				sdistances[ slength ] = distance;

				_direction.copy( position );
				_direction.subSelf( light.target.matrixWorld.getPosition() );
				_direction.normalize();

				sdirections[ soffset ]     = _direction.x;
				sdirections[ soffset + 1 ] = _direction.y;
				sdirections[ soffset + 2 ] = _direction.z;

				sangles[ slength ] = Math.cos( light.angle );
				sexponents[ slength ] = light.exponent;

				slength += 1;

			}

		}

		// null eventual remains from removed lights
		// (this is to avoid if in shader)

		for ( l = dlength * 3, ll = dcolors.length; l < ll; l ++ ) dcolors[ l ] = 0.0;
		for ( l = plength * 3, ll = pcolors.length; l < ll; l ++ ) pcolors[ l ] = 0.0;
		for ( l = slength * 3, ll = scolors.length; l < ll; l ++ ) scolors[ l ] = 0.0;

		zlights.directional.length = dlength;
		zlights.point.length = plength;
		zlights.spot.length = slength;

		zlights.ambient[ 0 ] = r;
		zlights.ambient[ 1 ] = g;
		zlights.ambient[ 2 ] = b;

	};

	// GL state setting

	this.setFaceCulling = function ( cullFace, frontFace ) {

		if ( cullFace ) {

			if ( !frontFace || frontFace === "ccw" ) {

				_gl.frontFace( _gl.CCW );

			} else {

				_gl.frontFace( _gl.CW );

			}

			if( cullFace === "back" ) {

				_gl.cullFace( _gl.BACK );

			} else if( cullFace === "front" ) {

				_gl.cullFace( _gl.FRONT );

			} else {

				_gl.cullFace( _gl.FRONT_AND_BACK );

			}

			_gl.enable( _gl.CULL_FACE );

		} else {

			_gl.disable( _gl.CULL_FACE );

		}

	};

	this.setObjectFaces = function ( object ) {

		if ( _oldDoubleSided !== object.doubleSided ) {

			if ( object.doubleSided ) {

				_gl.disable( _gl.CULL_FACE );

			} else {

				_gl.enable( _gl.CULL_FACE );

			}

			_oldDoubleSided = object.doubleSided;

		}

		if ( _oldFlipSided !== object.flipSided ) {

			if ( object.flipSided ) {

				_gl.frontFace( _gl.CW );

			} else {

				_gl.frontFace( _gl.CCW );

			}

			_oldFlipSided = object.flipSided;

		}

	};

	this.setDepthTest = function ( depthTest ) {

		if ( _oldDepthTest !== depthTest ) {

			if ( depthTest ) {

				_gl.enable( _gl.DEPTH_TEST );

			} else {

				_gl.disable( _gl.DEPTH_TEST );

			}

			_oldDepthTest = depthTest;

		}

	};

	this.setDepthWrite = function ( depthWrite ) {

		if ( _oldDepthWrite !== depthWrite ) {

			_gl.depthMask( depthWrite );
			_oldDepthWrite = depthWrite;

		}

	};

	function setLineWidth ( width ) {

		if ( width !== _oldLineWidth ) {

			_gl.lineWidth( width );

			_oldLineWidth = width;

		}

	};

	function setPolygonOffset ( polygonoffset, factor, units ) {

		if ( _oldPolygonOffset !== polygonoffset ) {

			if ( polygonoffset ) {

				_gl.enable( _gl.POLYGON_OFFSET_FILL );

			} else {

				_gl.disable( _gl.POLYGON_OFFSET_FILL );

			}

			_oldPolygonOffset = polygonoffset;

		}

		if ( polygonoffset && ( _oldPolygonOffsetFactor !== factor || _oldPolygonOffsetUnits !== units ) ) {

			_gl.polygonOffset( factor, units );

			_oldPolygonOffsetFactor = factor;
			_oldPolygonOffsetUnits = units;

		}

	};

	this.setBlending = function ( blending, blendEquation, blendSrc, blendDst ) {

		if ( blending !== _oldBlending ) {

			switch ( blending ) {

				case THREE.NoBlending:

					_gl.disable( _gl.BLEND );

					break;

				case THREE.AdditiveBlending:

					_gl.enable( _gl.BLEND );
					_gl.blendEquation( _gl.FUNC_ADD );
					_gl.blendFunc( _gl.SRC_ALPHA, _gl.ONE );

					break;

				case THREE.SubtractiveBlending:

					// TODO: Find blendFuncSeparate() combination
					_gl.enable( _gl.BLEND );
					_gl.blendEquation( _gl.FUNC_ADD );
					_gl.blendFunc( _gl.ZERO, _gl.ONE_MINUS_SRC_COLOR );

					break;

				case THREE.MultiplyBlending:

					// TODO: Find blendFuncSeparate() combination
					_gl.enable( _gl.BLEND );
					_gl.blendEquation( _gl.FUNC_ADD );
					_gl.blendFunc( _gl.ZERO, _gl.SRC_COLOR );

					break;

				case THREE.CustomBlending:

					_gl.enable( _gl.BLEND );

					break;

				default:

					_gl.enable( _gl.BLEND );
					_gl.blendEquationSeparate( _gl.FUNC_ADD, _gl.FUNC_ADD );
					_gl.blendFuncSeparate( _gl.SRC_ALPHA, _gl.ONE_MINUS_SRC_ALPHA, _gl.ONE, _gl.ONE_MINUS_SRC_ALPHA );

					break;

			}

			_oldBlending = blending;

		}

		if ( blending === THREE.CustomBlending ) {

			if ( blendEquation !== _oldBlendEquation ) {

				_gl.blendEquation( paramThreeToGL( blendEquation ) );

				_oldBlendEquation = blendEquation;

			}

			if ( blendSrc !== _oldBlendSrc || blendDst !== _oldBlendDst ) {

				_gl.blendFunc( paramThreeToGL( blendSrc ), paramThreeToGL( blendDst ) );

				_oldBlendSrc = blendSrc;
				_oldBlendDst = blendDst;

			}

		} else {

			_oldBlendEquation = null;
			_oldBlendSrc = null;
			_oldBlendDst = null;

		}

	};

	// Shaders

	function buildProgram ( shaderID, fragmentShader, vertexShader, uniforms, attributes, parameters ) {

		var p, pl, program, code;
		var chunks = [];

		// Generate code

		if ( shaderID ) {

			chunks.push( shaderID );

		} else {

			chunks.push( fragmentShader );
			chunks.push( vertexShader );

		}

		for ( p in parameters ) {

			chunks.push( p );
			chunks.push( parameters[ p ] );

		}

		code = chunks.join();

		// Check if code has been already compiled

		for ( p = 0, pl = _programs.length; p < pl; p ++ ) {

			var programInfo = _programs[ p ];

			if ( programInfo.code === code ) {

				// console.log( "Code already compiled." /*: \n\n" + code*/ );

				programInfo.usedTimes ++;

				return programInfo.program;

			}

		}

		//console.log( "building new program " );

		//

		program = _gl.createProgram();

		var prefix_vertex = [

			"precision " + _precision + " float;",

			( _maxVertexTextures > 0 ) ? "#define VERTEX_TEXTURES" : "",

			_this.gammaInput ? "#define GAMMA_INPUT" : "",
			_this.gammaOutput ? "#define GAMMA_OUTPUT" : "",
			_this.physicallyBasedShading ? "#define PHYSICALLY_BASED_SHADING" : "",

			"#define MAX_DIR_LIGHTS " + parameters.maxDirLights,
			"#define MAX_POINT_LIGHTS " + parameters.maxPointLights,
			"#define MAX_SPOT_LIGHTS " + parameters.maxSpotLights,

			"#define MAX_SHADOWS " + parameters.maxShadows,

			"#define MAX_BONES " + parameters.maxBones,

			parameters.map ? "#define USE_MAP" : "",
			parameters.envMap ? "#define USE_ENVMAP" : "",
			parameters.lightMap ? "#define USE_LIGHTMAP" : "",
			parameters.vertexColors ? "#define USE_COLOR" : "",
			parameters.skinning ? "#define USE_SKINNING" : "",
			parameters.morphTargets ? "#define USE_MORPHTARGETS" : "",
			parameters.morphNormals ? "#define USE_MORPHNORMALS" : "",
			parameters.perPixel ? "#define PHONG_PER_PIXEL" : "",
			parameters.wrapAround ? "#define WRAP_AROUND" : "",
			parameters.doubleSided ? "#define DOUBLE_SIDED" : "",

			parameters.shadowMapEnabled ? "#define USE_SHADOWMAP" : "",
			parameters.shadowMapSoft ? "#define SHADOWMAP_SOFT" : "",
			parameters.shadowMapDebug ? "#define SHADOWMAP_DEBUG" : "",
			parameters.shadowMapCascade ? "#define SHADOWMAP_CASCADE" : "",

			parameters.sizeAttenuation ? "#define USE_SIZEATTENUATION" : "",

			"uniform mat4 objectMatrix;",
			"uniform mat4 modelViewMatrix;",
			"uniform mat4 projectionMatrix;",
			"uniform mat4 viewMatrix;",
			"uniform mat3 normalMatrix;",
			"uniform vec3 cameraPosition;",

			"attribute vec3 position;",
			"attribute vec3 normal;",
			"attribute vec2 uv;",
			"attribute vec2 uv2;",

			"#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 skinVertexA;",
				"attribute vec4 skinVertexB;",
				"attribute vec4 skinIndex;",
				"attribute vec4 skinWeight;",

			"#endif",

			""

		].join("\n");

		var prefix_fragment = [

			"precision " + _precision + " float;",

			"#define MAX_DIR_LIGHTS " + parameters.maxDirLights,
			"#define MAX_POINT_LIGHTS " + parameters.maxPointLights,
			"#define MAX_SPOT_LIGHTS " + parameters.maxSpotLights,

			"#define MAX_SHADOWS " + parameters.maxShadows,

			parameters.alphaTest ? "#define ALPHATEST " + parameters.alphaTest: "",

			_this.gammaInput ? "#define GAMMA_INPUT" : "",
			_this.gammaOutput ? "#define GAMMA_OUTPUT" : "",
			_this.physicallyBasedShading ? "#define PHYSICALLY_BASED_SHADING" : "",

			( parameters.useFog && parameters.fog ) ? "#define USE_FOG" : "",
			( parameters.useFog && parameters.fog instanceof THREE.FogExp2 ) ? "#define FOG_EXP2" : "",

			parameters.map ? "#define USE_MAP" : "",
			parameters.envMap ? "#define USE_ENVMAP" : "",
			parameters.lightMap ? "#define USE_LIGHTMAP" : "",
			parameters.vertexColors ? "#define USE_COLOR" : "",

			parameters.metal ? "#define METAL" : "",
			parameters.perPixel ? "#define PHONG_PER_PIXEL" : "",
			parameters.wrapAround ? "#define WRAP_AROUND" : "",
			parameters.doubleSided ? "#define DOUBLE_SIDED" : "",

			parameters.shadowMapEnabled ? "#define USE_SHADOWMAP" : "",
			parameters.shadowMapSoft ? "#define SHADOWMAP_SOFT" : "",
			parameters.shadowMapDebug ? "#define SHADOWMAP_DEBUG" : "",
			parameters.shadowMapCascade ? "#define SHADOWMAP_CASCADE" : "",

			"uniform mat4 viewMatrix;",
			"uniform vec3 cameraPosition;",
			""

		].join("\n");

		var glFragmentShader = getShader( "fragment", prefix_fragment + fragmentShader );
		var glVertexShader = getShader( "vertex", prefix_vertex + vertexShader );

		_gl.attachShader( program, glVertexShader );
		_gl.attachShader( program, glFragmentShader );

		_gl.linkProgram( program );

		if ( !_gl.getProgramParameter( program, _gl.LINK_STATUS ) ) {

			console.error( "Could not initialise shader\n" + "VALIDATE_STATUS: " + _gl.getProgramParameter( program, _gl.VALIDATE_STATUS ) + ", gl error [" + _gl.getError() + "]" );

		}

		// clean up

		_gl.deleteShader( glFragmentShader );
		_gl.deleteShader( glVertexShader );

		//console.log( prefix_fragment + fragmentShader );
		//console.log( prefix_vertex + vertexShader );

		program.uniforms = {};
		program.attributes = {};

		var identifiers, u, a, i;

		// cache uniform locations

		identifiers = [

			'viewMatrix', 'modelViewMatrix', 'projectionMatrix', 'normalMatrix', 'objectMatrix', 'cameraPosition',
			'boneGlobalMatrices', 'morphTargetInfluences'

		];

		for ( u in uniforms ) {

			identifiers.push( u );

		}

		cacheUniformLocations( program, identifiers );

		// cache attributes locations

		identifiers = [

			"position", "normal", "uv", "uv2", "tangent", "color",
			"skinVertexA", "skinVertexB", "skinIndex", "skinWeight"

		];

		for ( i = 0; i < parameters.maxMorphTargets; i ++ ) {

			identifiers.push( "morphTarget" + i );

		}

		for ( i = 0; i < parameters.maxMorphNormals; i ++ ) {

			identifiers.push( "morphNormal" + i );

		}

		for ( a in attributes ) {

			identifiers.push( a );

		}

		cacheAttributeLocations( program, identifiers );

		program.id = _programs_counter ++;

		_programs.push( { program: program, code: code, usedTimes: 1 } );

		_this.info.memory.programs = _programs.length;

		return program;

	};

	// Shader parameters cache

	function cacheUniformLocations ( program, identifiers ) {

		var i, l, id;

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

			id = identifiers[ i ];
			program.uniforms[ id ] = _gl.getUniformLocation( program, id );

		}

	};

	function cacheAttributeLocations ( program, identifiers ) {

		var i, l, id;

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

			id = identifiers[ i ];
			program.attributes[ id ] = _gl.getAttribLocation( program, id );

		}

	};

	function getShader ( type, string ) {

		var shader;

		if ( type === "fragment" ) {

			shader = _gl.createShader( _gl.FRAGMENT_SHADER );

		} else if ( type === "vertex" ) {

			shader = _gl.createShader( _gl.VERTEX_SHADER );

		}

		_gl.shaderSource( shader, string );
		_gl.compileShader( shader );

		if ( !_gl.getShaderParameter( shader, _gl.COMPILE_STATUS ) ) {

			console.error( _gl.getShaderInfoLog( shader ) );
			console.error( string );
			return null;

		}

		return shader;

	};

	// Textures


	function isPowerOfTwo ( value ) {

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

	};

	function setTextureParameters ( textureType, texture, isImagePowerOfTwo ) {

		if ( isImagePowerOfTwo ) {

			_gl.texParameteri( textureType, _gl.TEXTURE_WRAP_S, paramThreeToGL( texture.wrapS ) );
			_gl.texParameteri( textureType, _gl.TEXTURE_WRAP_T, paramThreeToGL( texture.wrapT ) );

			_gl.texParameteri( textureType, _gl.TEXTURE_MAG_FILTER, paramThreeToGL( texture.magFilter ) );
			_gl.texParameteri( textureType, _gl.TEXTURE_MIN_FILTER, paramThreeToGL( texture.minFilter ) );

		} else {

			_gl.texParameteri( textureType, _gl.TEXTURE_WRAP_S, _gl.CLAMP_TO_EDGE );
			_gl.texParameteri( textureType, _gl.TEXTURE_WRAP_T, _gl.CLAMP_TO_EDGE );

			_gl.texParameteri( textureType, _gl.TEXTURE_MAG_FILTER, filterFallback( texture.magFilter ) );
			_gl.texParameteri( textureType, _gl.TEXTURE_MIN_FILTER, filterFallback( texture.minFilter ) );

		}

	};

	this.setTexture = function ( texture, slot ) {

		if ( texture.needsUpdate ) {

			if ( ! texture.__webglInit ) {

				texture.__webglInit = true;
				texture.__webglTexture = _gl.createTexture();

				_this.info.memory.textures ++;

			}

			_gl.activeTexture( _gl.TEXTURE0 + slot );
			_gl.bindTexture( _gl.TEXTURE_2D, texture.__webglTexture );

			_gl.pixelStorei( _gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, texture.premultiplyAlpha );

			var image = texture.image,
			isImagePowerOfTwo = isPowerOfTwo( image.width ) && isPowerOfTwo( image.height ),
			glFormat = paramThreeToGL( texture.format ),
			glType = paramThreeToGL( texture.type );

			setTextureParameters( _gl.TEXTURE_2D, texture, isImagePowerOfTwo );

			if ( texture instanceof THREE.DataTexture ) {

				_gl.texImage2D( _gl.TEXTURE_2D, 0, glFormat, image.width, image.height, 0, glFormat, glType, image.data );

			} else {

				_gl.texImage2D( _gl.TEXTURE_2D, 0, glFormat, glFormat, glType, texture.image );

			}

			if ( texture.generateMipmaps && isImagePowerOfTwo ) _gl.generateMipmap( _gl.TEXTURE_2D );

			texture.needsUpdate = false;

			if ( texture.onUpdate ) texture.onUpdate();

		} else {

			_gl.activeTexture( _gl.TEXTURE0 + slot );
			_gl.bindTexture( _gl.TEXTURE_2D, texture.__webglTexture );

		}

	};

	function clampToMaxSize ( image, maxSize ) {

		if ( image.width <= maxSize && image.height <= maxSize ) {

			return image;

		}

		// Warning: Scaling through the canvas will only work with images that use
		// premultiplied alpha.

		var maxDimension = Math.max( image.width, image.height );
		var newWidth = Math.floor( image.width * maxSize / maxDimension );
		var newHeight = Math.floor( image.height * maxSize / maxDimension );

		var canvas = document.createElement( 'canvas' );
		canvas.width = newWidth;
		canvas.height = newHeight;

		var ctx = canvas.getContext( "2d" );
		ctx.drawImage( image, 0, 0, image.width, image.height, 0, 0, newWidth, newHeight );

		return canvas;

	}

	function setCubeTexture ( texture, slot ) {

		if ( texture.image.length === 6 ) {

			if ( texture.needsUpdate ) {

				if ( ! texture.image.__webglTextureCube ) {

					texture.image.__webglTextureCube = _gl.createTexture();

				}

				_gl.activeTexture( _gl.TEXTURE0 + slot );
				_gl.bindTexture( _gl.TEXTURE_CUBE_MAP, texture.image.__webglTextureCube );

				var cubeImage = [];

				for ( var i = 0; i < 6; i ++ ) {

					if ( _this.autoScaleCubemaps ) {

						cubeImage[ i ] = clampToMaxSize( texture.image[ i ], _maxCubemapSize );

					} else {

						cubeImage[ i ] = texture.image[ i ];

					}

				}

				var image = cubeImage[ 0 ],
				isImagePowerOfTwo = isPowerOfTwo( image.width ) && isPowerOfTwo( image.height ),
				glFormat = paramThreeToGL( texture.format ),
				glType = paramThreeToGL( texture.type );

				setTextureParameters( _gl.TEXTURE_CUBE_MAP, texture, isImagePowerOfTwo );

				for ( var i = 0; i < 6; i ++ ) {

					_gl.texImage2D( _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, glFormat, glFormat, glType, cubeImage[ i ] );

				}

				if ( texture.generateMipmaps && isImagePowerOfTwo )	_gl.generateMipmap( _gl.TEXTURE_CUBE_MAP );

				texture.needsUpdate = false;

				if ( texture.onUpdate ) texture.onUpdate();

			} else {

				_gl.activeTexture( _gl.TEXTURE0 + slot );
				_gl.bindTexture( _gl.TEXTURE_CUBE_MAP, texture.image.__webglTextureCube );

			}

		}

	};

	function setCubeTextureDynamic ( texture, slot ) {

		_gl.activeTexture( _gl.TEXTURE0 + slot );
		_gl.bindTexture( _gl.TEXTURE_CUBE_MAP, texture.__webglTexture );

	};

	// Render targets

	function setupFrameBuffer ( framebuffer, renderTarget, textureTarget ) {

		_gl.bindFramebuffer( _gl.FRAMEBUFFER, framebuffer );
		_gl.framebufferTexture2D( _gl.FRAMEBUFFER, _gl.COLOR_ATTACHMENT0, textureTarget, renderTarget.__webglTexture, 0 );

	};

	function setupRenderBuffer ( renderbuffer, renderTarget  ) {

		_gl.bindRenderbuffer( _gl.RENDERBUFFER, renderbuffer );

		if ( renderTarget.depthBuffer && ! renderTarget.stencilBuffer ) {

			_gl.renderbufferStorage( _gl.RENDERBUFFER, _gl.DEPTH_COMPONENT16, renderTarget.width, renderTarget.height );
			_gl.framebufferRenderbuffer( _gl.FRAMEBUFFER, _gl.DEPTH_ATTACHMENT, _gl.RENDERBUFFER, renderbuffer );

		/* For some reason this is not working. Defaulting to RGBA4.
		} else if( ! renderTarget.depthBuffer && renderTarget.stencilBuffer ) {

			_gl.renderbufferStorage( _gl.RENDERBUFFER, _gl.STENCIL_INDEX8, renderTarget.width, renderTarget.height );
			_gl.framebufferRenderbuffer( _gl.FRAMEBUFFER, _gl.STENCIL_ATTACHMENT, _gl.RENDERBUFFER, renderbuffer );
		*/
		} else if( renderTarget.depthBuffer && renderTarget.stencilBuffer ) {

			_gl.renderbufferStorage( _gl.RENDERBUFFER, _gl.DEPTH_STENCIL, renderTarget.width, renderTarget.height );
			_gl.framebufferRenderbuffer( _gl.FRAMEBUFFER, _gl.DEPTH_STENCIL_ATTACHMENT, _gl.RENDERBUFFER, renderbuffer );

		} else {

			_gl.renderbufferStorage( _gl.RENDERBUFFER, _gl.RGBA4, renderTarget.width, renderTarget.height );

		}

	};

	this.setRenderTarget = function ( renderTarget ) {

		var isCube = ( renderTarget instanceof THREE.WebGLRenderTargetCube );

		if ( renderTarget && ! renderTarget.__webglFramebuffer ) {

			if( renderTarget.depthBuffer === undefined ) renderTarget.depthBuffer = true;
			if( renderTarget.stencilBuffer === undefined ) renderTarget.stencilBuffer = true;

			renderTarget.__webglTexture = _gl.createTexture();

			// Setup texture, create render and frame buffers

			var isTargetPowerOfTwo = isPowerOfTwo( renderTarget.width ) && isPowerOfTwo( renderTarget.height ),
				glFormat = paramThreeToGL( renderTarget.format ),
				glType = paramThreeToGL( renderTarget.type );

			if ( isCube ) {

				renderTarget.__webglFramebuffer = [];
				renderTarget.__webglRenderbuffer = [];

				_gl.bindTexture( _gl.TEXTURE_CUBE_MAP, renderTarget.__webglTexture );
				setTextureParameters( _gl.TEXTURE_CUBE_MAP, renderTarget, isTargetPowerOfTwo );

				for ( var i = 0; i < 6; i ++ ) {

					renderTarget.__webglFramebuffer[ i ] = _gl.createFramebuffer();
					renderTarget.__webglRenderbuffer[ i ] = _gl.createRenderbuffer();

					_gl.texImage2D( _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, glFormat, renderTarget.width, renderTarget.height, 0, glFormat, glType, null );

					setupFrameBuffer( renderTarget.__webglFramebuffer[ i ], renderTarget, _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i );
					setupRenderBuffer( renderTarget.__webglRenderbuffer[ i ], renderTarget );

				}

				if ( isTargetPowerOfTwo ) _gl.generateMipmap( _gl.TEXTURE_CUBE_MAP );

			} else {

				renderTarget.__webglFramebuffer = _gl.createFramebuffer();
				renderTarget.__webglRenderbuffer = _gl.createRenderbuffer();

				_gl.bindTexture( _gl.TEXTURE_2D, renderTarget.__webglTexture );
				setTextureParameters( _gl.TEXTURE_2D, renderTarget, isTargetPowerOfTwo );

				_gl.texImage2D( _gl.TEXTURE_2D, 0, glFormat, renderTarget.width, renderTarget.height, 0, glFormat, glType, null );

				setupFrameBuffer( renderTarget.__webglFramebuffer, renderTarget, _gl.TEXTURE_2D );
				setupRenderBuffer( renderTarget.__webglRenderbuffer, renderTarget );

				if ( isTargetPowerOfTwo ) _gl.generateMipmap( _gl.TEXTURE_2D );

			}

			// Release everything

			if ( isCube ) {

				_gl.bindTexture( _gl.TEXTURE_CUBE_MAP, null );

			} else {

				_gl.bindTexture( _gl.TEXTURE_2D, null );

			}

			_gl.bindRenderbuffer( _gl.RENDERBUFFER, null );
			_gl.bindFramebuffer( _gl.FRAMEBUFFER, null);

		}

		var framebuffer, width, height, vx, vy;

		if ( renderTarget ) {

			if ( isCube ) {

				framebuffer = renderTarget.__webglFramebuffer[ renderTarget.activeCubeFace ];

			} else {

				framebuffer = renderTarget.__webglFramebuffer;

			}

			width = renderTarget.width;
			height = renderTarget.height;

			vx = 0;
			vy = 0;

		} else {

			framebuffer = null;

			width = _viewportWidth;
			height = _viewportHeight;

			vx = _viewportX;
			vy = _viewportY;

		}

		if ( framebuffer !== _currentFramebuffer ) {

			_gl.bindFramebuffer( _gl.FRAMEBUFFER, framebuffer );
			_gl.viewport( vx, vy, width, height );

			_currentFramebuffer = framebuffer;

		}

		_currentWidth = width;
		_currentHeight = height;

	};

	function updateRenderTargetMipmap ( renderTarget ) {

		if ( renderTarget instanceof THREE.WebGLRenderTargetCube ) {

			_gl.bindTexture( _gl.TEXTURE_CUBE_MAP, renderTarget.__webglTexture );
			_gl.generateMipmap( _gl.TEXTURE_CUBE_MAP );
			_gl.bindTexture( _gl.TEXTURE_CUBE_MAP, null );

		} else {

			_gl.bindTexture( _gl.TEXTURE_2D, renderTarget.__webglTexture );
			_gl.generateMipmap( _gl.TEXTURE_2D );
			_gl.bindTexture( _gl.TEXTURE_2D, null );

		}

	};

	// Fallback filters for non-power-of-2 textures

	function filterFallback ( f ) {

		switch ( f ) {

			case THREE.NearestFilter:
			case THREE.NearestMipMapNearestFilter:
			case THREE.NearestMipMapLinearFilter: return _gl.NEAREST; break;

			case THREE.LinearFilter:
			case THREE.LinearMipMapNearestFilter:
			case THREE.LinearMipMapLinearFilter:
			default:

				return _gl.LINEAR; break;

		}

	};

	// Map three.js constants to WebGL constants

	function paramThreeToGL ( p ) {

		switch ( p ) {

			case THREE.RepeatWrapping: return _gl.REPEAT; break;
			case THREE.ClampToEdgeWrapping: return _gl.CLAMP_TO_EDGE; break;
			case THREE.MirroredRepeatWrapping: return _gl.MIRRORED_REPEAT; break;

			case THREE.NearestFilter: return _gl.NEAREST; break;
			case THREE.NearestMipMapNearestFilter: return _gl.NEAREST_MIPMAP_NEAREST; break;
			case THREE.NearestMipMapLinearFilter: return _gl.NEAREST_MIPMAP_LINEAR; break;

			case THREE.LinearFilter: return _gl.LINEAR; break;
			case THREE.LinearMipMapNearestFilter: return _gl.LINEAR_MIPMAP_NEAREST; break;
			case THREE.LinearMipMapLinearFilter: return _gl.LINEAR_MIPMAP_LINEAR; break;

			case THREE.UnsignedByteType: return _gl.UNSIGNED_BYTE; break;
			case THREE.UnsignedShort4444Type: return _gl.UNSIGNED_SHORT_4_4_4_4; break;
			case THREE.UnsignedShort5551Type: return _gl.UNSIGNED_SHORT_5_5_5_1; break;
			case THREE.UnsignedShort565Type: return _gl.UNSIGNED_SHORT_5_6_5; break;

			case THREE.ByteType: return _gl.BYTE; break;
			case THREE.ShortType: return _gl.SHORT; break;
			case THREE.UnsignedShortType: return _gl.UNSIGNED_SHORT; break;
			case THREE.IntType: return _gl.INT; break;
			case THREE.UnsignedIntType: return _gl.UNSIGNED_INT; break;
			case THREE.FloatType: return _gl.FLOAT; break;

			case THREE.AlphaFormat: return _gl.ALPHA; break;
			case THREE.RGBFormat: return _gl.RGB; break;
			case THREE.RGBAFormat: return _gl.RGBA; break;
			case THREE.LuminanceFormat: return _gl.LUMINANCE; break;
			case THREE.LuminanceAlphaFormat: return _gl.LUMINANCE_ALPHA; break;

			case THREE.AddEquation: return _gl.FUNC_ADD; break;
			case THREE.SubtractEquation: return _gl.FUNC_SUBTRACT; break;
			case THREE.ReverseSubtractEquation: return _gl.FUNC_REVERSE_SUBTRACT; break;

			case THREE.ZeroFactor: return _gl.ZERO; break;
			case THREE.OneFactor: return _gl.ONE; break;
			case THREE.SrcColorFactor: return _gl.SRC_COLOR; break;
			case THREE.OneMinusSrcColorFactor: return _gl.ONE_MINUS_SRC_COLOR; break;
			case THREE.SrcAlphaFactor: return _gl.SRC_ALPHA; break;
			case THREE.OneMinusSrcAlphaFactor: return _gl.ONE_MINUS_SRC_ALPHA; break;
			case THREE.DstAlphaFactor: return _gl.DST_ALPHA; break;
			case THREE.OneMinusDstAlphaFactor: return _gl.ONE_MINUS_DST_ALPHA; break;

			case THREE.DstColorFactor: return _gl.DST_COLOR; break;
			case THREE.OneMinusDstColorFactor: return _gl.ONE_MINUS_DST_COLOR; break;
			case THREE.SrcAlphaSaturateFactor: return _gl.SRC_ALPHA_SATURATE; break;

		}

		return 0;

	};

	// Allocations

	function allocateBones ( object ) {

		// 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 maxBones = 50;

		if ( object !== undefined && object instanceof THREE.SkinnedMesh ) {

			maxBones = object.bones.length;

		}

		return maxBones;

	};

	function allocateLights ( lights ) {

		var l, ll, light, dirLights, pointLights, spotLights, maxDirLights, maxPointLights, maxSpotLights;

		dirLights = pointLights = spotLights = maxDirLights = maxPointLights = maxSpotLights = 0;

		for ( l = 0, ll = lights.length; l < ll; l ++ ) {

			light = lights[ l ];

			if ( light.onlyShadow ) continue;

			if ( light instanceof THREE.DirectionalLight ) dirLights ++;
			if ( light instanceof THREE.PointLight ) pointLights ++;
			if ( light instanceof THREE.SpotLight ) spotLights ++;

		}

		if ( ( pointLights + spotLights + dirLights ) <= _maxLights ) {

			maxDirLights = dirLights;
			maxPointLights = pointLights;
			maxSpotLights = spotLights;

		} else {

			maxDirLights = Math.ceil( _maxLights * dirLights / ( pointLights + dirLights ) );
			maxPointLights = _maxLights - maxDirLights;
			maxSpotLights = maxPointLights; // this is not really correct

		}

		return { 'directional' : maxDirLights, 'point' : maxPointLights, 'spot': maxSpotLights };

	};

	function allocateShadows ( lights ) {

		var l, ll, light, maxShadows = 0;

		for ( l = 0, ll = lights.length; l < ll; l++ ) {

			light = lights[ l ];

			if ( ! light.castShadow ) continue;

			if ( light instanceof THREE.SpotLight ) maxShadows ++;
			if ( light instanceof THREE.DirectionalLight && ! light.shadowCascade ) maxShadows ++;

		}

		return maxShadows;

	};

	// Initialization

	function initGL () {

		var gl;

		try {

			if ( ! ( gl = _canvas.getContext( 'experimental-webgl', { alpha: _alpha, premultipliedAlpha: _premultipliedAlpha, antialias: _antialias, stencil: _stencil, preserveDrawingBuffer: _preserveDrawingBuffer } ) ) ) {

				throw 'Error creating WebGL context.';

			}

		} catch ( error ) {

			console.error( error );

		}

		if ( ! gl.getExtension( 'OES_texture_float' ) ) {

			console.log( 'THREE.WebGLRenderer: Float textures not supported.' );

		}

		return gl;

	};

	function setDefaultGLState () {

		_gl.clearColor( 0, 0, 0, 1 );
		_gl.clearDepth( 1 );
		_gl.clearStencil( 0 );

		_gl.enable( _gl.DEPTH_TEST );
		_gl.depthFunc( _gl.LEQUAL );

		_gl.frontFace( _gl.CCW );
		_gl.cullFace( _gl.BACK );
		_gl.enable( _gl.CULL_FACE );

		_gl.enable( _gl.BLEND );
		_gl.blendEquation( _gl.FUNC_ADD );
		_gl.blendFunc( _gl.SRC_ALPHA, _gl.ONE_MINUS_SRC_ALPHA );

		_gl.clearColor( _clearColor.r, _clearColor.g, _clearColor.b, _clearAlpha );

	};

	// default plugins (order is important)

	this.shadowMapPlugin = new THREE.ShadowMapPlugin();
	this.addPrePlugin( this.shadowMapPlugin );

	this.addPostPlugin( new THREE.SpritePlugin() );
	this.addPostPlugin( new THREE.LensFlarePlugin() );

};