text: /**
   * @author Rich Tibbett / https://github.com/richtr
   * @author mrdoob / http://mrdoob.com/
   * @author Tony Parisi / http://www.tonyparisi.com/
   * @author Takahiro / https://github.com/takahirox
   * @author Don McCurdy / https://www.donmccurdy.com
   */
  
  THREE.GLTFLoader = ( function () {
  	
  		function GLTFLoader( manager ) {
  	
  			this.manager = ( manager !== undefined ) ? manager : THREE.DefaultLoadingManager;
  	
  		}
  	
  		GLTFLoader.prototype = {
  	
  			constructor: GLTFLoader,
  	
  			crossOrigin: 'Anonymous',
  	
  			load: function ( url, onLoad, onProgress, onError ) {
  	
  				var scope = this;
  	
  				var path = this.path && ( typeof this.path === 'string' ) ? this.path : THREE.Loader.prototype.extractUrlBase( url );
  	
  				var loader = new THREE.FileLoader( scope.manager );
  	
  				loader.setResponseType( 'arraybuffer' );
  	
  				loader.load( url, function ( data ) {
  	
  					try {
  	
  						scope.parse( data, path, onLoad, onError );
  	
  					} catch ( e ) {
  	
  						// For SyntaxError or TypeError, return a generic failure message.
  						onError( e.constructor === Error ? e : new Error( 'THREE.GLTFLoader: Unable to parse model.' ) );
  	
  					}
  	
  				}, onProgress, onError );
  	
  			},
  	
  			setCrossOrigin: function ( value ) {
  	
  				this.crossOrigin = value;
  	
  			},
  	
  			setPath: function ( value ) {
  	
  				this.path = value;
  	
  			},
  	
  			parse: function ( data, path, onLoad, onError ) {
  	
  				var content;
  				var extensions = {};
  	
  				var magic = convertUint8ArrayToString( new Uint8Array( data, 0, 4 ) );
  	
  				if ( magic === BINARY_EXTENSION_HEADER_MAGIC ) {
  	
  					extensions[ EXTENSIONS.KHR_BINARY_GLTF ] = new GLTFBinaryExtension( data );
  					content = extensions[ EXTENSIONS.KHR_BINARY_GLTF ].content;
  	
  				} else {
  	
  					content = convertUint8ArrayToString( new Uint8Array( data ) );
  	
  				}
  	
  				var json = JSON.parse( content );
  	
  				if ( json.asset === undefined || json.asset.version[ 0 ] < 2 ) {
  	
  					onError( new Error( 'THREE.GLTFLoader: Unsupported asset. glTF versions >=2.0 are supported.' ) );
  					return;
  	
  				}
  	
  				if ( json.extensionsUsed ) {
  	
  					if( json.extensionsUsed.indexOf( EXTENSIONS.KHR_LIGHTS ) >= 0 ) {
  	
  						extensions[ EXTENSIONS.KHR_LIGHTS ] = new GLTFLightsExtension( json );
  	
  					}
  	
  					if( json.extensionsUsed.indexOf( EXTENSIONS.KHR_MATERIALS_COMMON ) >= 0 ) {
  	
  						extensions[ EXTENSIONS.KHR_MATERIALS_COMMON ] = new GLTFMaterialsCommonExtension( json );
  	
  					}
  	
  					if( json.extensionsUsed.indexOf( EXTENSIONS.KHR_MATERIALS_PBR_SPECULAR_GLOSSINESS ) >= 0 ) {
  	
  						extensions[ EXTENSIONS.KHR_MATERIALS_PBR_SPECULAR_GLOSSINESS ] = new GLTFMaterialsPbrSpecularGlossinessExtension();
  	
  					}
  	
  				}
  	
  				console.time( 'GLTFLoader' );
  	
  				var parser = new GLTFParser( json, extensions, {
  	
  					path: path || this.path,
  					crossOrigin: this.crossOrigin
  	
  				} );
  	
  				parser.parse( function ( scene, scenes, cameras, animations ) {
  	
  					console.timeEnd( 'GLTFLoader' );
  	
  					var glTF = {
  						scene: scene,
  						scenes: scenes,
  						cameras: cameras,
  						animations: animations
  					};
  	
  					onLoad( glTF );
  	
  				}, onError );
  	
  			}
  	
  		};
  	
  		/* GLTFREGISTRY */
  	
  		function GLTFRegistry() {
  	
  			var objects = {};
  	
  			return	{
  	
  				get: function ( key ) {
  	
  					return objects[ key ];
  	
  				},
  	
  				add: function ( key, object ) {
  	
  					objects[ key ] = object;
  	
  				},
  	
  				remove: function ( key ) {
  	
  					delete objects[ key ];
  	
  				},
  	
  				removeAll: function () {
  	
  					objects = {};
  	
  				},
  	
  				update: function ( scene, camera ) {
  	
  					for ( var name in objects ) {
  	
  						var object = objects[ name ];
  	
  						if ( object.update ) {
  	
  							object.update( scene, camera );
  	
  						}
  	
  					}
  	
  				}
  	
  			};
  	
  		}
  	
  		/*********************************/
  		/********** EXTENSIONS ***********/
  		/*********************************/
  	
  		var EXTENSIONS = {
  			KHR_BINARY_GLTF: 'KHR_binary_glTF',
  			KHR_LIGHTS: 'KHR_lights',
  			KHR_MATERIALS_COMMON: 'KHR_materials_common',
  			KHR_MATERIALS_PBR_SPECULAR_GLOSSINESS: 'KHR_materials_pbrSpecularGlossiness'
  		};
  	
  		/**
  		 * Lights Extension
  		 *
  		 * Specification: PENDING
  		 */
  		function GLTFLightsExtension( json ) {
  	
  			this.name = EXTENSIONS.KHR_LIGHTS;
  	
  			this.lights = {};
  	
  			var extension = ( json.extensions && json.extensions[ EXTENSIONS.KHR_LIGHTS ] ) || {};
  			var lights = extension.lights || {};
  	
  			for ( var lightId in lights ) {
  	
  				var light = lights[ lightId ];
  				var lightNode;
  	
  				var color = new THREE.Color().fromArray( light.color );
  	
  				switch ( light.type ) {
  	
  					case 'directional':
  						lightNode = new THREE.DirectionalLight( color );
  						lightNode.position.set( 0, 0, 1 );
  						break;
  	
  					case 'point':
  						lightNode = new THREE.PointLight( color );
  						break;
  	
  					case 'spot':
  						lightNode = new THREE.SpotLight( color );
  						lightNode.position.set( 0, 0, 1 );
  						break;
  	
  					case 'ambient':
  						lightNode = new THREE.AmbientLight( color );
  						break;
  	
  				}
  	
  				if ( lightNode ) {
  	
  					if ( light.constantAttenuation !== undefined ) {
  	
  						lightNode.intensity = light.constantAttenuation;
  	
  					}
  	
  					if ( light.linearAttenuation !== undefined ) {
  	
  						lightNode.distance = 1 / light.linearAttenuation;
  	
  					}
  	
  					if ( light.quadraticAttenuation !== undefined ) {
  	
  						lightNode.decay = light.quadraticAttenuation;
  	
  					}
  	
  					if ( light.fallOffAngle !== undefined ) {
  	
  						lightNode.angle = light.fallOffAngle;
  	
  					}
  	
  					if ( light.fallOffExponent !== undefined ) {
  	
  						console.warn( 'THREE.GLTFLoader:: light.fallOffExponent not currently supported.' );
  	
  					}
  	
  					lightNode.name = light.name || ( 'light_' + lightId );
  					this.lights[ lightId ] = lightNode;
  	
  				}
  	
  			}
  	
  		}
  	
  		/**
  		 * Common Materials Extension
  		 *
  		 * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/Khronos/KHR_materials_common
  		 */
  		function GLTFMaterialsCommonExtension( json ) {
  	
  			this.name = EXTENSIONS.KHR_MATERIALS_COMMON;
  	
  		}
  	
  		GLTFMaterialsCommonExtension.prototype.getMaterialType = function ( material ) {
  	
  			var khrMaterial = material.extensions[ this.name ];
  	
  			switch ( khrMaterial.type ) {
  	
  				case 'commonBlinn' :
  				case 'commonPhong' :
  					return THREE.MeshPhongMaterial;
  	
  				case 'commonLambert' :
  					return THREE.MeshLambertMaterial;
  	
  				case 'commonConstant' :
  				default :
  					return THREE.MeshBasicMaterial;
  	
  			}
  	
  		};
  	
  		GLTFMaterialsCommonExtension.prototype.extendParams = function ( materialParams, material, parser ) {
  	
  			var khrMaterial = material.extensions[ this.name ];
  	
  			var pending = [];
  	
  			var keys = [];
  	
  			// TODO: Currently ignored: 'ambientFactor', 'ambientTexture'
  			switch ( khrMaterial.type ) {
  	
  				case 'commonBlinn' :
  				case 'commonPhong' :
  					keys.push( 'diffuseFactor', 'diffuseTexture', 'specularFactor', 'specularTexture', 'shininessFactor' );
  					break;
  	
  				case 'commonLambert' :
  					keys.push( 'diffuseFactor', 'diffuseTexture' );
  					break;
  	
  				case 'commonConstant' :
  				default :
  					break;
  	
  			}
  	
  			var materialValues = {};
  	
  			keys.forEach( function( v ) {
  	
  				if ( khrMaterial[ v ] !== undefined ) materialValues[ v ] = khrMaterial[ v ];
  	
  			} );
  	
  			if ( materialValues.diffuseFactor !== undefined ) {
  	
  				materialParams.color = new THREE.Color().fromArray( materialValues.diffuseFactor );
  				materialParams.opacity = materialValues.diffuseFactor[ 3 ];
  	
  			}
  	
  			if ( materialValues.diffuseTexture !== undefined ) {
  	
  				pending.push( parser.assignTexture( materialParams, 'map', materialValues.diffuseTexture.index ) );
  	
  			}
  	
  			if ( materialValues.specularFactor !== undefined ) {
  	
  				materialParams.specular = new THREE.Color().fromArray( materialValues.specularFactor );
  	
  			}
  	
  			if ( materialValues.specularTexture !== undefined ) {
  	
  				pending.push( parser.assignTexture( materialParams, 'specularMap', materialValues.specularTexture.index ) );
  	
  			}
  	
  			if ( materialValues.shininessFactor !== undefined ) {
  	
  				materialParams.shininess = materialValues.shininessFactor;
  	
  			}
  	
  			return Promise.all( pending );
  	
  		};
  	
  		/* BINARY EXTENSION */
  	
  		var BINARY_EXTENSION_BUFFER_NAME = 'binary_glTF';
  		var BINARY_EXTENSION_HEADER_MAGIC = 'glTF';
  		var BINARY_EXTENSION_HEADER_LENGTH = 12;
  		var BINARY_EXTENSION_CHUNK_TYPES = { JSON: 0x4E4F534A, BIN: 0x004E4942 };
  	
  		function GLTFBinaryExtension( data ) {
  	
  			this.name = EXTENSIONS.KHR_BINARY_GLTF;
  			this.content = null;
  			this.body = null;
  	
  			var headerView = new DataView( data, 0, BINARY_EXTENSION_HEADER_LENGTH );
  	
  			this.header = {
  				magic: convertUint8ArrayToString( new Uint8Array( data.slice( 0, 4 ) ) ),
  				version: headerView.getUint32( 4, true ),
  				length: headerView.getUint32( 8, true )
  			};
  	
  			if ( this.header.magic !== BINARY_EXTENSION_HEADER_MAGIC ) {
  	
  				throw new Error( 'THREE.GLTFLoader: Unsupported glTF-Binary header.' );
  	
  			} else if ( this.header.version < 2.0 ) {
  	
  				throw new Error( 'THREE.GLTFLoader: Legacy binary file detected. Use GLTFLoader instead.' );
  	
  			}
  	
  			var chunkView = new DataView( data, BINARY_EXTENSION_HEADER_LENGTH );
  			var chunkIndex = 0;
  	
  			while ( chunkIndex < chunkView.byteLength ) {
  	
  				var chunkLength = chunkView.getUint32( chunkIndex, true );
  				chunkIndex += 4;
  	
  				var chunkType = chunkView.getUint32( chunkIndex, true );
  				chunkIndex += 4;
  	
  				if ( chunkType === BINARY_EXTENSION_CHUNK_TYPES.JSON ) {
  	
  					var contentArray = new Uint8Array( data, BINARY_EXTENSION_HEADER_LENGTH + chunkIndex, chunkLength );
  					this.content = convertUint8ArrayToString( contentArray );
  	
  				} else if ( chunkType === BINARY_EXTENSION_CHUNK_TYPES.BIN ) {
  	
  					var byteOffset = BINARY_EXTENSION_HEADER_LENGTH + chunkIndex;
  					this.body = data.slice( byteOffset, byteOffset + chunkLength );
  	
  				}
  	
  				// Clients must ignore chunks with unknown types.
  	
  				chunkIndex += chunkLength;
  	
  			}
  	
  			if ( this.content === null ) {
  	
  				throw new Error( 'THREE.GLTFLoader: JSON content not found.' );
  	
  			}
  	
  		}
  	
  		/**
  		 * Specular-Glossiness Extension
  		 *
  		 * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/Khronos/KHR_materials_pbrSpecularGlossiness
  		 */
  		function GLTFMaterialsPbrSpecularGlossinessExtension() {
  	
  			return {
  	
  				name: EXTENSIONS.KHR_MATERIALS_PBR_SPECULAR_GLOSSINESS,
  	
  				getMaterialType: function () {
  	
  					return THREE.ShaderMaterial;
  	
  				},
  	
  				extendParams: function ( params, material, parser ) {
  	
  					var pbrSpecularGlossiness = material.extensions[ this.name ];
  	
  					var shader = THREE.ShaderLib[ 'standard' ];
  	
  					var uniforms = THREE.UniformsUtils.clone( shader.uniforms );
  	
  					var specularMapParsFragmentChunk = [
  						'#ifdef USE_SPECULARMAP',
  						'	uniform sampler2D specularMap;',
  						'#endif'
  					].join( '\n' );
  	
  					var glossinessMapParsFragmentChunk = [
  						'#ifdef USE_GLOSSINESSMAP',
  						'	uniform sampler2D glossinessMap;',
  						'#endif'
  					].join( '\n' );
  	
  					var specularMapFragmentChunk = [
  						'vec3 specularFactor = specular;',
  						'#ifdef USE_SPECULARMAP',
  						'	vec4 texelSpecular = texture2D( specularMap, vUv );',
  						'	// reads channel RGB, compatible with a glTF Specular-Glossiness (RGBA) texture',
  						'	specularFactor *= texelSpecular.rgb;',
  						'#endif'
  					].join( '\n' );
  	
  					var glossinessMapFragmentChunk = [
  						'float glossinessFactor = glossiness;',
  						'#ifdef USE_GLOSSINESSMAP',
  						'	vec4 texelGlossiness = texture2D( glossinessMap, vUv );',
  						'	// reads channel A, compatible with a glTF Specular-Glossiness (RGBA) texture',
  						'	glossinessFactor *= texelGlossiness.a;',
  						'#endif'
  					].join( '\n' );
  	
  					var lightPhysicalFragmentChunk = [
  						'PhysicalMaterial material;',
  						'material.diffuseColor = diffuseColor.rgb;',
  						'material.specularRoughness = clamp( 1.0 - glossinessFactor, 0.04, 1.0 );',
  						'material.specularColor = specularFactor.rgb;',
  					].join( '\n' );
  	
  					var fragmentShader = shader.fragmentShader
  								.replace( '#include <specularmap_fragment>', '' )
  								.replace( 'uniform float roughness;', 'uniform vec3 specular;' )
  								.replace( 'uniform float metalness;', 'uniform float glossiness;' )
  								.replace( '#include <roughnessmap_pars_fragment>', specularMapParsFragmentChunk )
  								.replace( '#include <metalnessmap_pars_fragment>', glossinessMapParsFragmentChunk )
  								.replace( '#include <roughnessmap_fragment>', specularMapFragmentChunk )
  								.replace( '#include <metalnessmap_fragment>', glossinessMapFragmentChunk )
  								.replace( '#include <lights_physical_fragment>', lightPhysicalFragmentChunk );
  	
  					delete uniforms.roughness;
  					delete uniforms.metalness;
  					delete uniforms.roughnessMap;
  					delete uniforms.metalnessMap;
  	
  					uniforms.specular = { value: new THREE.Color().setHex( 0x111111 ) };
  					uniforms.glossiness = { value: 0.5 };
  					uniforms.specularMap = { value: null };
  					uniforms.glossinessMap = { value: null };
  	
  					params.vertexShader = shader.vertexShader;
  					params.fragmentShader = fragmentShader;
  					params.uniforms = uniforms;
  					params.defines = { 'STANDARD': '' };
  	
  					params.color = new THREE.Color( 1.0, 1.0, 1.0 );
  					params.opacity = 1.0;
  	
  					var pending = [];
  	
  					if ( Array.isArray( pbrSpecularGlossiness.diffuseFactor ) ) {
  	
  						var array = pbrSpecularGlossiness.diffuseFactor;
  	
  						params.color.fromArray( array );
  						params.opacity = array[ 3 ];
  	
  					}
  	
  					if ( pbrSpecularGlossiness.diffuseTexture !== undefined ) {
  	
  						pending.push( parser.assignTexture( params, 'map', pbrSpecularGlossiness.diffuseTexture.index ) );
  	
  					}
  	
  					params.emissive = new THREE.Color( 0.0, 0.0, 0.0 );
  					params.glossiness = pbrSpecularGlossiness.glossinessFactor !== undefined ? pbrSpecularGlossiness.glossinessFactor : 1.0;
  					params.specular = new THREE.Color( 1.0, 1.0, 1.0 );
  	
  					if ( Array.isArray( pbrSpecularGlossiness.specularFactor ) ) {
  	
  						params.specular.fromArray( pbrSpecularGlossiness.specularFactor );
  	
  					}
  	
  					if ( pbrSpecularGlossiness.specularGlossinessTexture !== undefined ) {
  	
  						var specGlossIndex = pbrSpecularGlossiness.specularGlossinessTexture.index;
  						pending.push( parser.assignTexture( params, 'glossinessMap', specGlossIndex ) );
  						pending.push( parser.assignTexture( params, 'specularMap', specGlossIndex ) );
  	
  					}
  	
  					return Promise.all( pending );
  	
  				},
  	
  				createMaterial: function ( params ) {
  	
  					// setup material properties based on MeshStandardMaterial for Specular-Glossiness
  	
  					var material = new THREE.ShaderMaterial( {
  						defines: params.defines,
  						vertexShader: params.vertexShader,
  						fragmentShader: params.fragmentShader,
  						uniforms: params.uniforms,
  						fog: true,
  						lights: true,
  						opacity: params.opacity,
  						transparent: params.transparent
  					} );
  	
  					material.isGLTFSpecularGlossinessMaterial = true;
  	
  					material.color = params.color;
  	
  					material.map = params.map === undefined ? null : params.map;
  	
  					material.lightMap = null;
  					material.lightMapIntensity = 1.0;
  	
  					material.aoMap = params.aoMap === undefined ? null : params.aoMap;
  					material.aoMapIntensity = 1.0;
  	
  					material.emissive = params.emissive;
  					material.emissiveIntensity = 1.0;
  					material.emissiveMap = params.emissiveMap === undefined ? null : params.emissiveMap;
  	
  					material.bumpMap = params.bumpMap === undefined ? null : params.bumpMap;
  					material.bumpScale = 1;
  	
  					material.normalMap = params.normalMap === undefined ? null : params.normalMap;
  					material.normalScale = new THREE.Vector2( 1, 1 );
  	
  					material.displacementMap = null;
  					material.displacementScale = 1;
  					material.displacementBias = 0;
  	
  					material.specularMap = params.specularMap === undefined ? null : params.specularMap;
  					material.specular = params.specular;
  	
  					material.glossinessMap = params.glossinessMap === undefined ? null : params.glossinessMap;
  					material.glossiness = params.glossiness;
  	
  					material.alphaMap = null;
  	
  					material.envMap = params.envMap === undefined ? null : params.envMap;
  					material.envMapIntensity = 1.0;
  	
  					material.refractionRatio = 0.98;
  	
  					material.extensions.derivatives = true;
  	
  					return material;
  	
  				},
  	
  				// Here's based on refreshUniformsCommon() and refreshUniformsStandard() in WebGLRenderer.
  				refreshUniforms: function ( renderer, scene, camera, geometry, material, group ) {
  	
  					var uniforms = material.uniforms;
  					var defines = material.defines;
  	
  					uniforms.opacity.value = material.opacity;
  	
  					uniforms.diffuse.value.copy( material.color );
  					uniforms.emissive.value.copy( material.emissive ).multiplyScalar( material.emissiveIntensity );
  	
  					uniforms.map.value = material.map;
  					uniforms.specularMap.value = material.specularMap;
  					uniforms.alphaMap.value = material.alphaMap;
  	
  					uniforms.lightMap.value = material.lightMap;
  					uniforms.lightMapIntensity.value = material.lightMapIntensity;
  	
  					uniforms.aoMap.value = material.aoMap;
  					uniforms.aoMapIntensity.value = material.aoMapIntensity;
  	
  					// uv repeat and offset setting priorities
  					// 1. color map
  					// 2. specular map
  					// 3. normal map
  					// 4. bump map
  					// 5. alpha map
  					// 6. emissive map
  	
  					var uvScaleMap;
  	
  					if ( material.map ) {
  	
  						uvScaleMap = material.map;
  	
  					} else if ( material.specularMap ) {
  	
  						uvScaleMap = material.specularMap;
  	
  					} else if ( material.displacementMap ) {
  	
  						uvScaleMap = material.displacementMap;
  	
  					} else if ( material.normalMap ) {
  	
  						uvScaleMap = material.normalMap;
  	
  					} else if ( material.bumpMap ) {
  	
  						uvScaleMap = material.bumpMap;
  	
  					} else if ( material.glossinessMap ) {
  	
  						uvScaleMap = material.glossinessMap;
  	
  					} else if ( material.alphaMap ) {
  	
  						uvScaleMap = material.alphaMap;
  	
  					} else if ( material.emissiveMap ) {
  	
  						uvScaleMap = material.emissiveMap;
  	
  					}
  	
  					if ( uvScaleMap !== undefined ) {
  	
  						// backwards compatibility
  						if ( uvScaleMap.isWebGLRenderTarget ) {
  	
  							uvScaleMap = uvScaleMap.texture;
  	
  						}
  	
  						var offset = uvScaleMap.offset;
  						var repeat = uvScaleMap.repeat;
  	
  						uniforms.offsetRepeat.value.set( offset.x, offset.y, repeat.x, repeat.y );
  	
  					}
  	
  					uniforms.envMap.value = material.envMap;
  					uniforms.envMapIntensity.value = material.envMapIntensity;
  					uniforms.flipEnvMap.value = ( material.envMap && material.envMap.isCubeTexture ) ? -1 : 1;
  	
  					uniforms.refractionRatio.value = material.refractionRatio;
  	
  					uniforms.specular.value.copy( material.specular );
  					uniforms.glossiness.value = material.glossiness;
  	
  					uniforms.glossinessMap.value = material.glossinessMap;
  	
  					uniforms.emissiveMap.value = material.emissiveMap;
  					uniforms.bumpMap.value = material.bumpMap;
  					uniforms.normalMap.value = material.normalMap;
  	
  					uniforms.displacementMap.value = material.displacementMap;
  					uniforms.displacementScale.value = material.displacementScale;
  					uniforms.displacementBias.value = material.displacementBias;
  	
  					if ( uniforms.glossinessMap.value !== null && defines.USE_GLOSSINESSMAP === undefined ) {
  	
  						defines.USE_GLOSSINESSMAP = '';
  						// set USE_ROUGHNESSMAP to enable vUv
  						defines.USE_ROUGHNESSMAP = '';
  	
  					}
  	
  					if ( uniforms.glossinessMap.value === null && defines.USE_GLOSSINESSMAP !== undefined ) {
  	
  						delete defines.USE_GLOSSINESSMAP;
  						delete defines.USE_ROUGHNESSMAP;
  	
  					}
  	
  				}
  	
  			};
  	
  		}
  	
  		/*********************************/
  		/********** INTERNALS ************/
  		/*********************************/
  	
  		/* CONSTANTS */
  	
  		var WEBGL_CONSTANTS = {
  			FLOAT: 5126,
  			//FLOAT_MAT2: 35674,
  			FLOAT_MAT3: 35675,
  			FLOAT_MAT4: 35676,
  			FLOAT_VEC2: 35664,
  			FLOAT_VEC3: 35665,
  			FLOAT_VEC4: 35666,
  			LINEAR: 9729,
  			REPEAT: 10497,
  			SAMPLER_2D: 35678,
  			POINTS: 0,
  			LINES: 1,
  			LINE_LOOP: 2,
  			LINE_STRIP: 3,
  			TRIANGLES: 4,
  			TRIANGLE_STRIP: 5,
  			TRIANGLE_FAN: 6,
  			UNSIGNED_BYTE: 5121,
  			UNSIGNED_SHORT: 5123
  		};
  	
  		var WEBGL_TYPE = {
  			5126: Number,
  			//35674: THREE.Matrix2,
  			35675: THREE.Matrix3,
  			35676: THREE.Matrix4,
  			35664: THREE.Vector2,
  			35665: THREE.Vector3,
  			35666: THREE.Vector4,
  			35678: THREE.Texture
  		};
  	
  		var WEBGL_COMPONENT_TYPES = {
  			5120: Int8Array,
  			5121: Uint8Array,
  			5122: Int16Array,
  			5123: Uint16Array,
  			5125: Uint32Array,
  			5126: Float32Array
  		};
  	
  		var WEBGL_FILTERS = {
  			9728: THREE.NearestFilter,
  			9729: THREE.LinearFilter,
  			9984: THREE.NearestMipMapNearestFilter,
  			9985: THREE.LinearMipMapNearestFilter,
  			9986: THREE.NearestMipMapLinearFilter,
  			9987: THREE.LinearMipMapLinearFilter
  		};
  	
  		var WEBGL_WRAPPINGS = {
  			33071: THREE.ClampToEdgeWrapping,
  			33648: THREE.MirroredRepeatWrapping,
  			10497: THREE.RepeatWrapping
  		};
  	
  		var WEBGL_TEXTURE_FORMATS = {
  			6406: THREE.AlphaFormat,
  			6407: THREE.RGBFormat,
  			6408: THREE.RGBAFormat,
  			6409: THREE.LuminanceFormat,
  			6410: THREE.LuminanceAlphaFormat
  		};
  	
  		var WEBGL_TEXTURE_DATATYPES = {
  			5121: THREE.UnsignedByteType,
  			32819: THREE.UnsignedShort4444Type,
  			32820: THREE.UnsignedShort5551Type,
  			33635: THREE.UnsignedShort565Type
  		};
  	
  		var WEBGL_SIDES = {
  			1028: THREE.BackSide,  // Culling front
  			1029: THREE.FrontSide  // Culling back
  			//1032: THREE.NoSide   // Culling front and back, what to do?
  		};
  	
  		var WEBGL_DEPTH_FUNCS = {
  			512: THREE.NeverDepth,
  			513: THREE.LessDepth,
  			514: THREE.EqualDepth,
  			515: THREE.LessEqualDepth,
  			516: THREE.GreaterEqualDepth,
  			517: THREE.NotEqualDepth,
  			518: THREE.GreaterEqualDepth,
  			519: THREE.AlwaysDepth
  		};
  	
  		var WEBGL_BLEND_EQUATIONS = {
  			32774: THREE.AddEquation,
  			32778: THREE.SubtractEquation,
  			32779: THREE.ReverseSubtractEquation
  		};
  	
  		var WEBGL_BLEND_FUNCS = {
  			0: THREE.ZeroFactor,
  			1: THREE.OneFactor,
  			768: THREE.SrcColorFactor,
  			769: THREE.OneMinusSrcColorFactor,
  			770: THREE.SrcAlphaFactor,
  			771: THREE.OneMinusSrcAlphaFactor,
  			772: THREE.DstAlphaFactor,
  			773: THREE.OneMinusDstAlphaFactor,
  			774: THREE.DstColorFactor,
  			775: THREE.OneMinusDstColorFactor,
  			776: THREE.SrcAlphaSaturateFactor
  			// The followings are not supported by Three.js yet
  			//32769: CONSTANT_COLOR,
  			//32770: ONE_MINUS_CONSTANT_COLOR,
  			//32771: CONSTANT_ALPHA,
  			//32772: ONE_MINUS_CONSTANT_COLOR
  		};
  	
  		var WEBGL_TYPE_SIZES = {
  			'SCALAR': 1,
  			'VEC2': 2,
  			'VEC3': 3,
  			'VEC4': 4,
  			'MAT2': 4,
  			'MAT3': 9,
  			'MAT4': 16
  		};
  	
  		var PATH_PROPERTIES = {
  			scale: 'scale',
  			translation: 'position',
  			rotation: 'quaternion',
  			weights: 'morphTargetInfluences'
  		};
  	
  		var INTERPOLATION = {
  			CATMULLROMSPLINE: THREE.InterpolateSmooth,
  			CUBICSPLINE: THREE.InterpolateSmooth,
  			LINEAR: THREE.InterpolateLinear,
  			STEP: THREE.InterpolateDiscrete
  		};
  	
  		var STATES_ENABLES = {
  			2884: 'CULL_FACE',
  			2929: 'DEPTH_TEST',
  			3042: 'BLEND',
  			3089: 'SCISSOR_TEST',
  			32823: 'POLYGON_OFFSET_FILL',
  			32926: 'SAMPLE_ALPHA_TO_COVERAGE'
  		};
  	
  		var ALPHA_MODES = {
  			OPAQUE: 'OPAQUE',
  			MASK: 'MASK',
  			BLEND: 'BLEND'
  		};
  	
  		/* UTILITY FUNCTIONS */
  	
  		function _each( object, callback, thisObj ) {
  	
  			if ( !object ) {
  				return Promise.resolve();
  			}
  	
  			var results;
  			var fns = [];
  	
  			if ( Object.prototype.toString.call( object ) === '[object Array]' ) {
  	
  				results = [];
  	
  				var length = object.length;
  	
  				for ( var idx = 0; idx < length; idx ++ ) {
  	
  					var value = callback.call( thisObj || this, object[ idx ], idx );
  	
  					if ( value ) {
  	
  						fns.push( value );
  	
  						if ( value instanceof Promise ) {
  	
  							value.then( function( key, value ) {
  	
  								results[ key ] = value;
  	
  							}.bind( this, idx ));
  	
  						} else {
  	
  							results[ idx ] = value;
  	
  						}
  	
  					}
  	
  				}
  	
  			} else {
  	
  				results = {};
  	
  				for ( var key in object ) {
  	
  					if ( object.hasOwnProperty( key ) ) {
  	
  						var value = callback.call( thisObj || this, object[ key ], key );
  	
  						if ( value ) {
  	
  							fns.push( value );
  	
  							if ( value instanceof Promise ) {
  	
  								value.then( function( key, value ) {
  	
  									results[ key ] = value;
  	
  								}.bind( this, key ));
  	
  							} else {
  	
  								results[ key ] = value;
  	
  							}
  	
  						}
  	
  					}
  	
  				}
  	
  			}
  	
  			return Promise.all( fns ).then( function() {
  	
  				return results;
  	
  			});
  	
  		}
  	
  		function resolveURL( url, path ) {
  	
  			// Invalid URL
  			if ( typeof url !== 'string' || url === '' )
  				return '';
  	
  			// Absolute URL http://,https://,//
  			if ( /^(https?:)?\/\//i.test( url ) ) {
  	
  				return url;
  	
  			}
  	
  			// Data URI
  			if ( /^data:.*,.*$/i.test( url ) ) {
  	
  				return url;
  	
  			}
  	
  			// Blob URL
  			if ( /^blob:.*$/i.test( url ) ) {
  	
  				return url;
  	
  			}
  	
  			// Relative URL
  			return ( path || '' ) + url;
  	
  		}
  	
  		function convertUint8ArrayToString( array ) {
  	
  			if ( window.TextDecoder !== undefined ) {
  	
  				return new TextDecoder().decode( array );
  	
  			}
  	
  			// Avoid the String.fromCharCode.apply(null, array) shortcut, which
  			// throws a "maximum call stack size exceeded" error for large arrays.
  	
  			var s = '';
  	
  			for ( var i = 0, il = array.length; i < il; i ++ ) {
  	
  				s += String.fromCharCode( array[ i ] );
  	
  			}
  	
  			return s;
  	
  		}
  	
  		/**
  		 * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#default-material
  		 */
  		function createDefaultMaterial() {
  	
  			return new THREE.MeshStandardMaterial( {
  				color: 0xFFFFFF,
  				emissive: 0x000000,
  				metalness: 1,
  				roughness: 1,
  				transparent: false,
  				depthTest: true,
  				side: THREE.FrontSide
  			} );
  	
  		}
  	
  		/**
  		 * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#morph-targets
  		 * @param {THREE.Mesh} mesh
  		 * @param {GLTF.Mesh} meshDef
  		 * @param {GLTF.Primitive} primitiveDef
  		 * @param {Object} dependencies
  		 */
  		function addMorphTargets ( mesh, meshDef, primitiveDef, dependencies ) {
  	
  			var geometry = mesh.geometry;
  			var material = mesh.material;
  	
  			var targets = primitiveDef.targets;
  			var morphAttributes = geometry.morphAttributes;
  	
  			morphAttributes.position = [];
  			morphAttributes.normal = [];
  	
  			material.morphTargets = true;
  	
  			for ( var i = 0, il = targets.length; i < il; i ++ ) {
  	
  				var target = targets[ i ];
  				var attributeName = 'morphTarget' + i;
  	
  				var positionAttribute, normalAttribute;
  	
  				if ( target.POSITION !== undefined ) {
  	
  					// Three.js morph formula is
  					//   position
  					//     + weight0 * ( morphTarget0 - position )
  					//     + weight1 * ( morphTarget1 - position )
  					//     ...
  					// while the glTF one is
  					//   position
  					//     + weight0 * morphTarget0
  					//     + weight1 * morphTarget1
  					//     ...
  					// then adding position to morphTarget.
  					// So morphTarget value will depend on mesh's position, then cloning attribute
  					// for the case if attribute is shared among two or more meshes.
  	
  					positionAttribute = dependencies.accessors[ target.POSITION ].clone();
  					var position = geometry.attributes.position;
  	
  					for ( var j = 0, jl = positionAttribute.count; j < jl; j ++ ) {
  	
  						positionAttribute.setXYZ(
  							j,
  							positionAttribute.getX( j ) + position.getX( j ),
  							positionAttribute.getY( j ) + position.getY( j ),
  							positionAttribute.getZ( j ) + position.getZ( j )
  						);
  	
  					}
  	
  				} else {
  	
  					// Copying the original position not to affect the final position.
  					// See the formula above.
  					positionAttribute = geometry.attributes.position.clone();
  	
  				}
  	
  				if ( target.NORMAL !== undefined ) {
  	
  					material.morphNormals = true;
  	
  					// see target.POSITION's comment
  	
  					normalAttribute = dependencies.accessors[ target.NORMAL ].clone();
  					var normal = geometry.attributes.normal;
  	
  					for ( var j = 0, jl = normalAttribute.count; j < jl; j ++ ) {
  	
  						normalAttribute.setXYZ(
  							j,
  							normalAttribute.getX( j ) + normal.getX( j ),
  							normalAttribute.getY( j ) + normal.getY( j ),
  							normalAttribute.getZ( j ) + normal.getZ( j )
  						);
  	
  					}
  	
  				} else {
  	
  					normalAttribute = geometry.attributes.normal.clone();
  	
  				}
  	
  				if ( target.TANGENT !== undefined ) {
  	
  					// TODO: implement
  	
  				}
  	
  				positionAttribute.name = attributeName;
  				normalAttribute.name = attributeName;
  	
  				morphAttributes.position.push( positionAttribute );
  				morphAttributes.normal.push( normalAttribute );
  	
  			}
  	
  			mesh.updateMorphTargets();
  	
  			if ( meshDef.weights !== undefined ) {
  	
  				for ( var i = 0, il = meshDef.weights.length; i < il; i ++ ) {
  	
  					mesh.morphTargetInfluences[ i ] = meshDef.weights[ i ];
  	
  				}
  	
  			}
  	
  		}
  	
  		/* GLTF PARSER */
  	
  		function GLTFParser( json, extensions, options ) {
  	
  			this.json = json || {};
  			this.extensions = extensions || {};
  			this.options = options || {};
  	
  			// loader object cache
  			this.cache = new GLTFRegistry();
  	
  		}
  	
  		GLTFParser.prototype._withDependencies = function ( dependencies ) {
  	
  			var _dependencies = {};
  	
  			for ( var i = 0; i < dependencies.length; i ++ ) {
  	
  				var dependency = dependencies[ i ];
  				var fnName = 'load' + dependency.charAt( 0 ).toUpperCase() + dependency.slice( 1 );
  	
  				var cached = this.cache.get( dependency );
  	
  				if ( cached !== undefined ) {
  	
  					_dependencies[ dependency ] = cached;
  	
  				} else if ( this[ fnName ] ) {
  	
  					var fn = this[ fnName ]();
  					this.cache.add( dependency, fn );
  	
  					_dependencies[ dependency ] = fn;
  	
  				}
  	
  			}
  	
  			return _each( _dependencies, function ( dependency ) {
  	
  				return dependency;
  	
  			} );
  	
  		};
  	
  		GLTFParser.prototype.parse = function ( onLoad, onError ) {
  	
  			var json = this.json;
  	
  			// Clear the loader cache
  			this.cache.removeAll();
  	
  			// Fire the callback on complete
  			this._withDependencies( [
  	
  				'scenes',
  				'cameras',
  				'animations'
  	
  			] ).then( function ( dependencies ) {
  	
  				var scenes = [];
  	
  				for ( var name in dependencies.scenes ) {
  	
  					scenes.push( dependencies.scenes[ name ] );
  	
  				}
  	
  				var scene = json.scene !== undefined ? dependencies.scenes[ json.scene ] : scenes[ 0 ];
  	
  				var cameras = [];
  	
  				for ( var name in dependencies.cameras ) {
  	
  					var camera = dependencies.cameras[ name ];
  					cameras.push( camera );
  	
  				}
  	
  				var animations = [];
  	
  				for ( var name in dependencies.animations ) {
  	
  					animations.push( dependencies.animations[ name ] );
  	
  				}
  	
  				onLoad( scene, scenes, cameras, animations );
  	
  			} ).catch( onError );
  	
  		};
  	
  		/**
  		 * Requests the specified dependency asynchronously, with caching.
  		 * @param {string} type
  		 * @param {number} index
  		 * @return {Promise<Object>}
  		 */
  		GLTFParser.prototype.getDependency = function ( type, index ) {
  	
  			var cacheKey = type + ':' + index;
  			var dependency = this.cache.get( cacheKey );
  	
  			if ( !dependency ) {
  	
  				var fnName = 'load' + type.charAt( 0 ).toUpperCase() + type.slice( 1 );
  				dependency = this[ fnName ]( index );
  				this.cache.add( cacheKey, dependency );
  	
  			}
  	
  			return dependency;
  	
  		};
  	
  		/**
  		 * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#buffers-and-buffer-views
  		 * @param {number} bufferIndex
  		 * @return {Promise<ArrayBuffer>}
  		 */
  		GLTFParser.prototype.loadBuffer = function ( bufferIndex ) {
  	
  			var bufferDef = this.json.buffers[ bufferIndex ];
  	
  			if ( bufferDef.type && bufferDef.type !== 'arraybuffer' ) {
  	
  				throw new Error( 'THREE.GLTFLoader: %s buffer type is not supported.', bufferDef.type );
  	
  			}
  	
  			// If present, GLB container is required to be the first buffer.
  			if ( bufferDef.uri === undefined && bufferIndex === 0 ) {
  	
  				return Promise.resolve( this.extensions[ EXTENSIONS.KHR_BINARY_GLTF ].body );
  	
  			}
  	
  			var options = this.options;
  	
  			return new Promise( function ( resolve ) {
  	
  				var loader = new THREE.FileLoader();
  				loader.setResponseType( 'arraybuffer' );
  				loader.load( resolveURL( bufferDef.uri, options.path ), resolve);
  	
  			} );
  	
  		};
  	
  		/**
  		 * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#buffers-and-buffer-views
  		 * @param {number} bufferViewIndex
  		 * @return {Promise<ArrayBuffer>}
  		 */
  		GLTFParser.prototype.loadBufferView = function ( bufferViewIndex ) {
  	
  			var bufferViewDef = this.json.bufferViews[ bufferViewIndex ];
  	
  			return this.getDependency( 'buffer', bufferViewDef.buffer ).then( function ( buffer ) {
  	
  				var byteLength = bufferViewDef.byteLength || 0;
  				var byteOffset = bufferViewDef.byteOffset || 0;
  				return buffer.slice( byteOffset, byteOffset + byteLength );
  	
  			} );
  	
  		};
  	
  		GLTFParser.prototype.loadAccessors = function () {
  	
  			var parser = this;
  			var json = this.json;
  	
  			return _each( json.accessors, function ( accessor ) {
  	
  				return parser.getDependency( 'bufferView', accessor.bufferView ).then( function ( bufferView ) {
  	
  					var itemSize = WEBGL_TYPE_SIZES[ accessor.type ];
  					var TypedArray = WEBGL_COMPONENT_TYPES[ accessor.componentType ];
  	
  					// For VEC3: itemSize is 3, elementBytes is 4, itemBytes is 12.
  					var elementBytes = TypedArray.BYTES_PER_ELEMENT;
  					var itemBytes = elementBytes * itemSize;
  					var byteStride = json.bufferViews[ accessor.bufferView ].byteStride;
  					var array;
  	
  					// The buffer is not interleaved if the stride is the item size in bytes.
  					if ( byteStride && byteStride !== itemBytes ) {
  	
  						// Use the full buffer if it's interleaved.
  						array = new TypedArray( bufferView );
  	
  						// Integer parameters to IB/IBA are in array elements, not bytes.
  						var ib = new THREE.InterleavedBuffer( array, byteStride / elementBytes );
  	
  						return new THREE.InterleavedBufferAttribute( ib, itemSize, accessor.byteOffset / elementBytes );
  	
  					} else {
  	
  						array = new TypedArray( bufferView, accessor.byteOffset, accessor.count * itemSize );
  	
  						return new THREE.BufferAttribute( array, itemSize );
  	
  					}
  	
  				} );
  	
  			} );
  	
  		};
  	
  		/**
  		 * Specification: https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#textures
  		 * @param {number} textureIndex
  		 * @return {Promise<THREE.Texture>}
  		 */
  		GLTFParser.prototype.loadTexture = function ( textureIndex ) {
  	
  			var parser = this;
  			var json = this.json;
  			var options = this.options;
  	
  			var URL = window.URL || window.webkitURL;
  	
  			var textureDef = json.textures[ textureIndex ];
  			var source = json.images[ textureDef.source ];
  			var sourceURI = source.uri;
  			var isObjectURL = false;
  	
  			if ( source.bufferView !== undefined ) {
  	
  				// Load binary image data from bufferView, if provided.
  	
  				sourceURI = parser.getDependency( 'bufferView', source.bufferView )
  					.then( function ( bufferView ) {
  	
  						isObjectURL = true;
  						var blob = new Blob( [ bufferView ], { type: source.mimeType } );
  						sourceURI = URL.createObjectURL( blob );
  						return sourceURI;
  	
  					} );
  	
  			}
  	
  			return Promise.resolve( sourceURI ).then( function ( sourceURI ) {
  	
  				// Load Texture resource.
  	
  				var textureLoader = THREE.Loader.Handlers.get( sourceURI ) || new THREE.TextureLoader();
  				textureLoader.setCrossOrigin( options.crossOrigin );
  	
  				return new Promise( function ( resolve, reject ) {
  	
  					textureLoader.load( resolveURL( sourceURI, options.path ), resolve, undefined, reject );
  	
  				} );
  	
  			} ).then( function ( texture ) {
  	
  				// Clean up resources and configure Texture.
  	
  				if ( isObjectURL !== undefined ) {
  	
  					URL.revokeObjectURL( sourceURI );
  	
  				}
  	
  				texture.flipY = false;
  	
  				if ( textureDef.name !== undefined ) texture.name = textureDef.name;
  	
  				texture.format = textureDef.format !== undefined ? WEBGL_TEXTURE_FORMATS[ textureDef.format ] : THREE.RGBAFormat;
  	
  				if ( textureDef.internalFormat !== undefined && texture.format !== WEBGL_TEXTURE_FORMATS[ textureDef.internalFormat ] ) {
  	
  					console.warn( 'THREE.GLTFLoader: Three.js does not support texture internalFormat which is different from texture format. ' +
  												'internalFormat will be forced to be the same value as format.' );
  	
  				}
  	
  				texture.type = textureDef.type !== undefined ? WEBGL_TEXTURE_DATATYPES[ textureDef.type ] : THREE.UnsignedByteType;
  	
  				var samplers = json.samplers || {};
  				var sampler = samplers[ textureDef.sampler ] || {};
  	
  				texture.magFilter = WEBGL_FILTERS[ sampler.magFilter ] || THREE.LinearFilter;
  				texture.minFilter = WEBGL_FILTERS[ sampler.minFilter ] || THREE.LinearMipMapLinearFilter;
  				texture.wrapS = WEBGL_WRAPPINGS[ sampler.wrapS ] || THREE.RepeatWrapping;
  				texture.wrapT = WEBGL_WRAPPINGS[ sampler.wrapT ] || THREE.RepeatWrapping;
  	
  				return texture;
  	
  			} );
  	
  		};
  	
  		/**
  		 * Asynchronously assigns a texture to the given material parameters.
  		 * @param {Object} materialParams
  		 * @param {string} textureName
  		 * @param {number} textureIndex
  		 * @return {Promise}
  		 */
  		GLTFParser.prototype.assignTexture = function ( materialParams, textureName, textureIndex ) {
  	
  			return this.getDependency( 'texture', textureIndex ).then( function ( texture ) {
  	
  				materialParams[ textureName ] = texture;
  	
  			} );
  	
  		};
  	
  		/**
  		 * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#materials
  		 * @return {Promise<Array<THREE.Material>>}
  		 */
  		GLTFParser.prototype.loadMaterials = function () {
  	
  			var parser = this;
  			var json = this.json;
  			var extensions = this.extensions;
  	
  			return _each( json.materials, function ( material ) {
  	
  				var materialType;
  				var materialParams = {};
  				var materialExtensions = material.extensions || {};
  	
  				var pending = [];
  	
  				if ( materialExtensions[ EXTENSIONS.KHR_MATERIALS_COMMON ] ) {
  	
  					var khcExtension = extensions[ EXTENSIONS.KHR_MATERIALS_COMMON ];
  					materialType = khcExtension.getMaterialType( material );
  					pending.push( khcExtension.extendParams( materialParams, material, parser ) );
  	
  				} else if ( materialExtensions[ EXTENSIONS.KHR_MATERIALS_PBR_SPECULAR_GLOSSINESS ] ) {
  	
  					var sgExtension = extensions[ EXTENSIONS.KHR_MATERIALS_PBR_SPECULAR_GLOSSINESS ];
  					materialType = sgExtension.getMaterialType( material );
  					pending.push( sgExtension.extendParams( materialParams, material, parser ) );
  	
  				} else if ( material.pbrMetallicRoughness !== undefined ) {
  	
  					// Specification:
  					// https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#metallic-roughness-material
  	
  					materialType = THREE.MeshStandardMaterial;
  	
  					var metallicRoughness = material.pbrMetallicRoughness;
  	
  					materialParams.color = new THREE.Color( 1.0, 1.0, 1.0 );
  					materialParams.opacity = 1.0;
  	
  					if ( Array.isArray( metallicRoughness.baseColorFactor ) ) {
  	
  						var array = metallicRoughness.baseColorFactor;
  	
  						materialParams.color.fromArray( array );
  						materialParams.opacity = array[ 3 ];
  	
  					}
  	
  					if ( metallicRoughness.baseColorTexture !== undefined ) {
  	
  						pending.push( parser.assignTexture( materialParams, 'map', metallicRoughness.baseColorTexture.index ) );
  	
  					}
  	
  					materialParams.metalness = metallicRoughness.metallicFactor !== undefined ? metallicRoughness.metallicFactor : 1.0;
  					materialParams.roughness = metallicRoughness.roughnessFactor !== undefined ? metallicRoughness.roughnessFactor : 1.0;
  	
  					if ( metallicRoughness.metallicRoughnessTexture !== undefined ) {
  	
  						var textureIndex = metallicRoughness.metallicRoughnessTexture.index;
  						pending.push( parser.assignTexture( materialParams, 'metalnessMap', textureIndex ) );
  						pending.push( parser.assignTexture( materialParams, 'roughnessMap', textureIndex ) );
  	
  					}
  	
  				} else {
  	
  					materialType = THREE.MeshPhongMaterial;
  	
  				}
  	
  				if ( material.doubleSided === true ) {
  	
  					materialParams.side = THREE.DoubleSide;
  	
  				}
  	
  				var alphaMode = material.alphaMode || ALPHA_MODES.OPAQUE;
  	
  				if ( alphaMode !== ALPHA_MODES.OPAQUE ) {
  	
  					materialParams.transparent = true;
  	
  				} else {
  	
  					materialParams.transparent = false;
  	
  				}
  	
  				if ( material.normalTexture !== undefined ) {
  	
  					pending.push( parser.assignTexture( materialParams, 'normalMap', material.normalTexture.index ) );
  	
  				}
  	
  				if ( material.occlusionTexture !== undefined ) {
  	
  					pending.push( parser.assignTexture( materialParams, 'aoMap', material.occlusionTexture.index ) );
  	
  				}
  	
  				if ( material.emissiveFactor !== undefined ) {
  	
  					if ( materialType === THREE.MeshBasicMaterial ) {
  	
  						materialParams.color = new THREE.Color().fromArray( material.emissiveFactor );
  	
  					} else {
  	
  						materialParams.emissive = new THREE.Color().fromArray( material.emissiveFactor );
  	
  					}
  	
  				}
  	
  				if ( material.emissiveTexture !== undefined ) {
  	
  					if ( materialType === THREE.MeshBasicMaterial ) {
  	
  						pending.push( parser.assignTexture( materialParams, 'map', material.emissiveTexture.index ) );
  	
  					} else {
  	
  						pending.push( parser.assignTexture( materialParams, 'emissiveMap', material.emissiveTexture.index ) );
  	
  					}
  	
  				}
  	
  				return Promise.all( pending ).then( function () {
  	
  					var _material;
  	
  					if ( materialType === THREE.ShaderMaterial ) {
  	
  						_material = extensions[ EXTENSIONS.KHR_MATERIALS_PBR_SPECULAR_GLOSSINESS ].createMaterial( materialParams );
  	
  					} else {
  	
  						_material = new materialType( materialParams );
  	
  					}
  	
  					if ( material.name !== undefined ) _material.name = material.name;
  	
  					// Normal map textures use OpenGL conventions:
  					// https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#materialnormaltexture
  					_material.normalScale.x = -1;
  	
  					_material.userData = material.extras;
  	
  					return _material;
  	
  				} );
  	
  			} );
  	
  		};
  	
  		GLTFParser.prototype.loadGeometries = function ( primitives ) {
  	
  			return this._withDependencies( [
  	
  				'accessors',
  	
  			] ).then( function ( dependencies ) {
  	
  				return _each( primitives, function ( primitive ) {
  	
  					var geometry = new THREE.BufferGeometry();
  	
  					var attributes = primitive.attributes;
  	
  					for ( var attributeId in attributes ) {
  	
  						var attributeEntry = attributes[ attributeId ];
  	
  						if ( attributeEntry === undefined ) return;
  	
  						var bufferAttribute = dependencies.accessors[ attributeEntry ];
  	
  						switch ( attributeId ) {
  	
  							case 'POSITION':
  	
  								geometry.addAttribute( 'position', bufferAttribute );
  								break;
  	
  							case 'NORMAL':
  	
  								geometry.addAttribute( 'normal', bufferAttribute );
  								break;
  	
  							case 'TEXCOORD_0':
  							case 'TEXCOORD0':
  							case 'TEXCOORD':
  	
  								geometry.addAttribute( 'uv', bufferAttribute );
  								break;
  	
  							case 'TEXCOORD_1':
  	
  								geometry.addAttribute( 'uv2', bufferAttribute );
  								break;
  	
  							case 'COLOR_0':
  							case 'COLOR0':
  							case 'COLOR':
  	
  								geometry.addAttribute( 'color', bufferAttribute );
  								break;
  	
  							case 'WEIGHTS_0':
  							case 'WEIGHT': // WEIGHT semantic deprecated.
  	
  								geometry.addAttribute( 'skinWeight', bufferAttribute );
  								break;
  	
  							case 'JOINTS_0':
  							case 'JOINT': // JOINT semantic deprecated.
  	
  								geometry.addAttribute( 'skinIndex', bufferAttribute );
  								break;
  	
  						}
  	
  					}
  	
  					if ( primitive.indices !== undefined ) {
  	
  						geometry.setIndex( dependencies.accessors[ primitive.indices ] );
  	
  					}
  	
  					return geometry;
  	
  				} );
  	
  			} );
  	
  		};
  	
  		/**
  		 * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#meshes
  		 */
  		GLTFParser.prototype.loadMeshes = function () {
  	
  			var scope = this;
  			var json = this.json;
  	
  			return this._withDependencies( [
  	
  				'accessors',
  				'materials'
  	
  			] ).then( function ( dependencies ) {
  	
  				return _each( json.meshes, function ( meshDef ) {
  	
  					var group = new THREE.Group();
  	
  					if ( meshDef.name !== undefined ) group.name = meshDef.name;
  					if ( meshDef.extras ) group.userData = meshDef.extras;
  	
  					var primitives = meshDef.primitives || [];
  	
  					return scope.loadGeometries( primitives ).then( function ( geometries ) {
  	
  						for ( var name in primitives ) {
  	
  							var primitive = primitives[ name ];
  							var geometry = geometries[ name ];
  	
  							var material = primitive.material === undefined
  								? createDefaultMaterial()
  								: dependencies.materials[ primitive.material ];
  	
  							if ( material.aoMap
  									&& geometry.attributes.uv2 === undefined
  									&& geometry.attributes.uv !== undefined ) {
  	
  								console.log( 'THREE.GLTFLoader: Duplicating UVs to support aoMap.' );
  								geometry.addAttribute( 'uv2', new THREE.BufferAttribute( geometry.attributes.uv.array, 2 ) );
  	
  							}
  	
  							if ( geometry.attributes.color !== undefined ) {
  	
  								material.vertexColors = THREE.VertexColors;
  								material.needsUpdate = true;
  	
  							}
  	
  							if ( geometry.attributes.normal === undefined ) {
  	
  								if ( material.flatShading !== undefined ) {
  	
  									material.flatShading = true;
  	
  								} else {
  	
  									// TODO: Remove this backwards-compatibility fix after r87 release.
  									material.shading = THREE.FlatShading;
  	
  								}
  	
  							}
  	
  							var mesh;
  	
  							if ( primitive.mode === WEBGL_CONSTANTS.TRIANGLES || primitive.mode === undefined ) {
  	
  								mesh = new THREE.Mesh( geometry, material );
  	
  							} else if ( primitive.mode === WEBGL_CONSTANTS.TRIANGLE_STRIP ) {
  	
  								mesh = new THREE.Mesh( geometry, material );
  								mesh.drawMode = THREE.TriangleStripDrawMode;
  	
  							} else if ( primitive.mode === WEBGL_CONSTANTS.TRIANGLE_FAN ) {
  	
  								mesh = new THREE.Mesh( geometry, material );
  								mesh.drawMode = THREE.TriangleFanDrawMode;
  	
  							} else if ( primitive.mode === WEBGL_CONSTANTS.LINES ) {
  	
  								mesh = new THREE.LineSegments( geometry, material );
  	
  							} else if ( primitive.mode === WEBGL_CONSTANTS.LINE_STRIP ) {
  	
  								mesh = new THREE.Line( geometry, material );
  	
  							} else if ( primitive.mode === WEBGL_CONSTANTS.LINE_LOOP ) {
  	
  								mesh = new THREE.LineLoop( geometry, material );
  	
  							} else if ( primitive.mode === WEBGL_CONSTANTS.POINTS ) {
  	
  								mesh = new THREE.Points( geometry, material );
  	
  							} else {
  	
  								throw new Error( 'THREE.GLTFLoader: Primitive mode unsupported: ', primitive.mode );
  	
  							}
  	
  							mesh.name = group.name + '_' + name;
  	
  							if ( primitive.targets !== undefined ) {
  	
  								addMorphTargets( mesh, meshDef, primitive, dependencies );
  	
  							}
  	
  							if ( primitive.extras ) mesh.userData = primitive.extras;
  	
  							group.add( mesh );
  	
  						}
  	
  						return group;
  	
  					} );
  	
  				} );
  	
  			} );
  	
  		};
  	
  		/**
  		 * Specification: https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#cameras
  		 */
  		GLTFParser.prototype.loadCameras = function () {
  	
  			var json = this.json;
  	
  			return _each( json.cameras, function ( camera ) {
  	
  				var _camera;
  	
  				var params = camera[ camera.type ];
  	
  				if ( !params ) {
  	
  					console.warn( 'THREE.GLTFLoader: Missing camera parameters.' );
  					return;
  	
  				}
  	
  				if ( camera.type === 'perspective' ) {
  	
  					var aspectRatio = params.aspectRatio || 1;
  					var xfov = params.yfov * aspectRatio;
  	
  					_camera = new THREE.PerspectiveCamera( THREE.Math.radToDeg( xfov ), aspectRatio, params.znear || 1, params.zfar || 2e6 );
  	
  				} else if ( camera.type === 'orthographic' ) {
  	
  					_camera = new THREE.OrthographicCamera( params.xmag / -2, params.xmag / 2, params.ymag / 2, params.ymag / -2, params.znear, params.zfar );
  	
  				}
  	
  				if ( camera.name !== undefined ) _camera.name = camera.name;
  				if ( camera.extras ) _camera.userData = camera.extras;
  	
  				return _camera;
  	
  			} );
  	
  		};
  	
  		GLTFParser.prototype.loadSkins = function () {
  	
  			var json = this.json;
  	
  			return this._withDependencies( [
  	
  				'accessors'
  	
  			] ).then( function ( dependencies ) {
  	
  				return _each( json.skins, function ( skin ) {
  	
  					var _skin = {
  						joints: skin.joints,
  						inverseBindMatrices: dependencies.accessors[ skin.inverseBindMatrices ]
  					};
  	
  					return _skin;
  	
  				} );
  	
  			} );
  	
  		};
  	
  		GLTFParser.prototype.loadAnimations = function () {
  	
  			var json = this.json;
  	
  			return this._withDependencies( [
  	
  				'accessors',
  				'nodes'
  	
  			] ).then( function ( dependencies ) {
  	
  				return _each( json.animations, function ( animation, animationId ) {
  	
  					var tracks = [];
  	
  					for ( var channelId in animation.channels ) {
  	
  						var channel = animation.channels[ channelId ];
  						var sampler = animation.samplers[ channel.sampler ];
  	
  						if ( sampler ) {
  	
  							var target = channel.target;
  							var name = target.node !== undefined ? target.node : target.id; // NOTE: target.id is deprecated.
  							var input = animation.parameters !== undefined ? animation.parameters[ sampler.input ] : sampler.input;
  							var output = animation.parameters !== undefined ? animation.parameters[ sampler.output ] : sampler.output;
  	
  							var inputAccessor = dependencies.accessors[ input ];
  							var outputAccessor = dependencies.accessors[ output ];
  	
  							var node = dependencies.nodes[ name ];
  	
  							if ( node ) {
  	
  								node.updateMatrix();
  								node.matrixAutoUpdate = true;
  	
  								var TypedKeyframeTrack;
  	
  								switch ( PATH_PROPERTIES[ target.path ] ) {
  	
  									case PATH_PROPERTIES.weights:
  	
  										TypedKeyframeTrack = THREE.NumberKeyframeTrack;
  										break;
  	
  									case PATH_PROPERTIES.rotation:
  	
  										TypedKeyframeTrack = THREE.QuaternionKeyframeTrack;
  										break;
  	
  									case PATH_PROPERTIES.position:
  									case PATH_PROPERTIES.scale:
  									default:
  	
  										TypedKeyframeTrack = THREE.VectorKeyframeTrack;
  										break;
  	
  								}
  	
  								var targetName = node.name ? node.name : node.uuid;
  	
  								if ( sampler.interpolation === 'CATMULLROMSPLINE' ) {
  	
  									console.warn( 'THREE.GLTFLoader: CATMULLROMSPLINE interpolation is not supported. Using CUBICSPLINE instead.' );
  	
  								}
  	
  								var interpolation = sampler.interpolation !== undefined ? INTERPOLATION[ sampler.interpolation ] : THREE.InterpolateLinear;
  	
  								var targetNames = [];
  	
  								if ( PATH_PROPERTIES[ target.path ] === PATH_PROPERTIES.weights ) {
  	
  									// node should be THREE.Group here but
  									// PATH_PROPERTIES.weights(morphTargetInfluences) should be
  									// the property of a mesh object under node.
  									// So finding targets here.
  	
  									node.traverse( function ( object ) {
  	
  										if ( object.isMesh === true && object.material.morphTargets === true ) {
  	
  											targetNames.push( object.name ? object.name : object.uuid );
  	
  										}
  	
  									} );
  	
  								} else {
  	
  									targetNames.push( targetName );
  	
  								}
  	
  								// KeyframeTrack.optimize() will modify given 'times' and 'values'
  								// buffers before creating a truncated copy to keep. Because buffers may
  								// be reused by other tracks, make copies here.
  								for ( var i = 0, il = targetNames.length; i < il; i ++ ) {
  	
  									tracks.push( new TypedKeyframeTrack(
  										targetNames[ i ] + '.' + PATH_PROPERTIES[ target.path ],
  										THREE.AnimationUtils.arraySlice( inputAccessor.array, 0 ),
  										THREE.AnimationUtils.arraySlice( outputAccessor.array, 0 ),
  										interpolation
  									) );
  	
  								}
  	
  							}
  	
  						}
  	
  					}
  	
  					var name = animation.name !== undefined ? animation.name : 'animation_' + animationId;
  	
  					return new THREE.AnimationClip( name, undefined, tracks );
  	
  				} );
  	
  			} );
  	
  		};
  	
  		GLTFParser.prototype.loadNodes = function () {
  	
  			var json = this.json;
  			var extensions = this.extensions;
  			var scope = this;
  	
  			var nodes = json.nodes || [];
  			var skins = json.skins || [];
  	
  			// Nothing in the node definition indicates whether it is a Bone or an
  			// Object3D. Use the skins' joint references to mark bones.
  			skins.forEach( function ( skin ) {
  	
  				skin.joints.forEach( function ( id ) {
  	
  					nodes[ id ].isBone = true;
  	
  				} );
  	
  			} );
  	
  			return _each( json.nodes, function ( node ) {
  	
  				var matrix = new THREE.Matrix4();
  	
  				var _node = node.isBone === true ? new THREE.Bone() : new THREE.Object3D();
  	
  				if ( node.name !== undefined ) {
  	
  					_node.name = THREE.PropertyBinding.sanitizeNodeName( node.name );
  	
  				}
  	
  				if ( node.extras ) _node.userData = node.extras;
  	
  				if ( node.matrix !== undefined ) {
  	
  					matrix.fromArray( node.matrix );
  					_node.applyMatrix( matrix );
  	
  				} else {
  	
  					if ( node.translation !== undefined ) {
  	
  						_node.position.fromArray( node.translation );
  	
  					}
  	
  					if ( node.rotation !== undefined ) {
  	
  						_node.quaternion.fromArray( node.rotation );
  	
  					}
  	
  					if ( node.scale !== undefined ) {
  	
  						_node.scale.fromArray( node.scale );
  	
  					}
  	
  				}
  	
  				return _node;
  	
  			} ).then( function ( __nodes ) {
  	
  				return scope._withDependencies( [
  	
  					'meshes',
  					'skins',
  					'cameras'
  	
  				] ).then( function ( dependencies ) {
  	
  					return _each( __nodes, function ( _node, nodeId ) {
  	
  						var node = json.nodes[ nodeId ];
  	
  						var meshes;
  	
  						if ( node.mesh !== undefined) {
  	
  							meshes = [ node.mesh ];
  	
  						} else if ( node.meshes !== undefined ) {
  	
  							console.warn( 'THREE.GLTFLoader: Legacy glTF file detected. Nodes may have no more than one mesh.' );
  	
  							meshes = node.meshes;
  	
  						}
  	
  						if ( meshes !== undefined ) {
  	
  							for ( var meshId in meshes ) {
  	
  								var mesh = meshes[ meshId ];
  								var group = dependencies.meshes[ mesh ];
  	
  								if ( group === undefined ) {
  	
  									console.warn( 'THREE.GLTFLoader: Could not find node "' + mesh + '".' );
  									continue;
  	
  								}
  	
  								// do not clone children as they will be replaced anyway
  								var clonedgroup = group.clone( false );
  	
  								for ( var childrenId in group.children ) {
  	
  									var child = group.children[ childrenId ];
  									var originalChild = child;
  	
  									// clone Mesh to add to _node
  	
  									var originalMaterial = child.material;
  									var originalGeometry = child.geometry;
  									var originalInfluences = child.morphTargetInfluences;
  									var originalUserData = child.userData;
  									var originalName = child.name;
  	
  									var material = originalMaterial;
  	
  									switch ( child.type ) {
  	
  										case 'LineSegments':
  											child = new THREE.LineSegments( originalGeometry, material );
  											break;
  	
  										case 'LineLoop':
  											child = new THREE.LineLoop( originalGeometry, material );
  											break;
  	
  										case 'Line':
  											child = new THREE.Line( originalGeometry, material );
  											break;
  	
  										case 'Points':
  											child = new THREE.Points( originalGeometry, material );
  											break;
  	
  										default:
  											child = new THREE.Mesh( originalGeometry, material );
  											child.drawMode = originalChild.drawMode;
  	
  									}
  	
  									child.castShadow = true;
  									child.morphTargetInfluences = originalInfluences;
  									child.userData = originalUserData;
  									child.name = originalName;
  	
  									var skinEntry;
  	
  									if ( node.skin !== undefined ) {
  	
  										skinEntry = dependencies.skins[ node.skin ];
  	
  									}
  	
  									// Replace Mesh with SkinnedMesh in library
  									if ( skinEntry ) {
  	
  										var geometry = originalGeometry;
  										material = originalMaterial;
  										material.skinning = true;
  	
  										child = new THREE.SkinnedMesh( geometry, material );
  										child.castShadow = true;
  										child.userData = originalUserData;
  										child.name = originalName;
  	
  										var bones = [];
  										var boneInverses = [];
  	
  										for ( var i = 0, l = skinEntry.joints.length; i < l; i ++ ) {
  	
  											var jointId = skinEntry.joints[ i ];
  											var jointNode = __nodes[ jointId ];
  	
  											if ( jointNode ) {
  	
  												bones.push( jointNode );
  	
  												var m = skinEntry.inverseBindMatrices.array;
  												var mat = new THREE.Matrix4().fromArray( m, i * 16 );
  												boneInverses.push( mat );
  	
  											} else {
  	
  												console.warn( 'THREE.GLTFLoader: Joint "%s" could not be found.', jointId );
  	
  											}
  	
  										}
  	
  										child.bind( new THREE.Skeleton( bones, boneInverses ), child.matrixWorld );
  	
  									}
  	
  									clonedgroup.add( child );
  	
  								}
  	
  								_node.add( clonedgroup );
  	
  							}
  	
  						}
  	
  						if ( node.camera !== undefined ) {
  	
  							var camera = dependencies.cameras[ node.camera ];
  	
  							_node.add( camera );
  	
  						}
  	
  						if ( node.extensions
  								 && node.extensions[ EXTENSIONS.KHR_LIGHTS ]
  								 && node.extensions[ EXTENSIONS.KHR_LIGHTS ].light !== undefined ) {
  	
  							var lights = extensions[ EXTENSIONS.KHR_LIGHTS ].lights;
  							_node.add( lights[ node.extensions[ EXTENSIONS.KHR_LIGHTS ].light ] );
  	
  						}
  	
  						return _node;
  	
  					} );
  	
  				} );
  	
  			} );
  	
  		};
  	
  		GLTFParser.prototype.loadScenes = function () {
  	
  			var json = this.json;
  			var extensions = this.extensions;
  	
  			// scene node hierachy builder
  	
  			function buildNodeHierachy( nodeId, parentObject, allNodes ) {
  	
  				var _node = allNodes[ nodeId ];
  				parentObject.add( _node );
  	
  				var node = json.nodes[ nodeId ];
  	
  				if ( node.children ) {
  	
  					var children = node.children;
  	
  					for ( var i = 0, l = children.length; i < l; i ++ ) {
  	
  						var child = children[ i ];
  						buildNodeHierachy( child, _node, allNodes );
  	
  					}
  	
  				}
  	
  			}
  	
  			return this._withDependencies( [
  	
  				'nodes'
  	
  			] ).then( function ( dependencies ) {
  	
  				return _each( json.scenes, function ( scene ) {
  	
  					var _scene = new THREE.Scene();
  					if ( scene.name !== undefined ) _scene.name = scene.name;
  	
  					if ( scene.extras ) _scene.userData = scene.extras;
  	
  					var nodes = scene.nodes || [];
  	
  					for ( var i = 0, l = nodes.length; i < l; i ++ ) {
  	
  						var nodeId = nodes[ i ];
  						buildNodeHierachy( nodeId, _scene, dependencies.nodes );
  	
  					}
  	
  					_scene.traverse( function ( child ) {
  	
  						// for Specular-Glossiness.
  						if ( child.material && child.material.isGLTFSpecularGlossinessMaterial ) {
  	
  							child.onBeforeRender = extensions[ EXTENSIONS.KHR_MATERIALS_PBR_SPECULAR_GLOSSINESS ].refreshUniforms;
  	
  						}
  	
  					} );
  	
  					// Ambient lighting, if present, is always attached to the scene root.
  					if ( scene.extensions
  								 && scene.extensions[ EXTENSIONS.KHR_LIGHTS ]
  								 && scene.extensions[ EXTENSIONS.KHR_LIGHTS ].light !== undefined ) {
  	
  						var lights = extensions[ EXTENSIONS.KHR_LIGHTS ].lights;
  						_scene.add( lights[ scene.extensions[ EXTENSIONS.KHR_LIGHTS ].light ] );
  	
  					}
  	
  					return _scene;
  	
  				} );
  	
  			} );
  	
  		};
  	
  		return GLTFLoader;
  	
  	} )();