///////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2002-2025, Open Design Alliance (the "Alliance").
// All rights reserved.
// 
// This software and its documentation and related materials are owned by
// the Alliance. The software may only be incorporated into application
// programs owned by members of the Alliance, subject to a signed
// Membership Agreement and Supplemental Software License Agreement with the
// Alliance. The structure and organization of this software are the valuable
// trade secrets of the Alliance and its suppliers. The software is also
// protected by copyright law and international treaty provisions. Application
// programs incorporating this software must include the following statement
// with their copyright notices:
// 
//   This application incorporates Open Design Alliance software pursuant to a
//   license agreement with Open Design Alliance.
//   Open Design Alliance Copyright (C) 2002-2025 by Open Design Alliance.
//   All rights reserved.
// 
// By use of this software, its documentation or related materials, you
// acknowledge and accept the above terms.
///////////////////////////////////////////////////////////////////////////////

(function (global, factory) {
	typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('three'), require('@inweb/viewer-three')) :
	typeof define === 'function' && define.amd ? define(['exports', 'three', '@inweb/viewer-three'], factory) :
	(global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory((global.ODA = global.ODA || {}, global.ODA.Three = global.ODA.Three || {}, global.ODA.Three.Extensions = global.ODA.Three.Extensions || {}), global.THREE, global.ODA.Three));
})(this, (function (exports, three, viewerThree) { 'use strict';

	function toTrianglesDrawMode( geometry, drawMode ) {
		if ( drawMode === three.TrianglesDrawMode ) {
			console.warn( 'THREE.BufferGeometryUtils.toTrianglesDrawMode(): Geometry already defined as triangles.' );
			return geometry;
		}
		if ( drawMode === three.TriangleFanDrawMode || drawMode === three.TriangleStripDrawMode ) {
			let index = geometry.getIndex();
			if ( index === null ) {
				const indices = [];
				const position = geometry.getAttribute( 'position' );
				if ( position !== undefined ) {
					for ( let i = 0; i < position.count; i ++ ) {
						indices.push( i );
					}
					geometry.setIndex( indices );
					index = geometry.getIndex();
				} else {
					console.error( 'THREE.BufferGeometryUtils.toTrianglesDrawMode(): Undefined position attribute. Processing not possible.' );
					return geometry;
				}
			}
			const numberOfTriangles = index.count - 2;
			const newIndices = [];
			if ( drawMode === three.TriangleFanDrawMode ) {
				for ( let i = 1; i <= numberOfTriangles; i ++ ) {
					newIndices.push( index.getX( 0 ) );
					newIndices.push( index.getX( i ) );
					newIndices.push( index.getX( i + 1 ) );
				}
			} else {
				for ( let i = 0; i < numberOfTriangles; i ++ ) {
					if ( i % 2 === 0 ) {
						newIndices.push( index.getX( i ) );
						newIndices.push( index.getX( i + 1 ) );
						newIndices.push( index.getX( i + 2 ) );
					} else {
						newIndices.push( index.getX( i + 2 ) );
						newIndices.push( index.getX( i + 1 ) );
						newIndices.push( index.getX( i ) );
					}
				}
			}
			if ( ( newIndices.length / 3 ) !== numberOfTriangles ) {
				console.error( 'THREE.BufferGeometryUtils.toTrianglesDrawMode(): Unable to generate correct amount of triangles.' );
			}
			const newGeometry = geometry.clone();
			newGeometry.setIndex( newIndices );
			newGeometry.clearGroups();
			return newGeometry;
		} else {
			console.error( 'THREE.BufferGeometryUtils.toTrianglesDrawMode(): Unknown draw mode:', drawMode );
			return geometry;
		}
	}

	class GLTFLoader extends three.Loader {
		constructor( manager ) {
			super( manager );
			this.dracoLoader = null;
			this.ktx2Loader = null;
			this.meshoptDecoder = null;
			this.pluginCallbacks = [];
			this.register( function ( parser ) {
				return new GLTFMaterialsClearcoatExtension( parser );
			} );
			this.register( function ( parser ) {
				return new GLTFMaterialsDispersionExtension( parser );
			} );
			this.register( function ( parser ) {
				return new GLTFTextureBasisUExtension( parser );
			} );
			this.register( function ( parser ) {
				return new GLTFTextureWebPExtension( parser );
			} );
			this.register( function ( parser ) {
				return new GLTFTextureAVIFExtension( parser );
			} );
			this.register( function ( parser ) {
				return new GLTFMaterialsSheenExtension( parser );
			} );
			this.register( function ( parser ) {
				return new GLTFMaterialsTransmissionExtension( parser );
			} );
			this.register( function ( parser ) {
				return new GLTFMaterialsVolumeExtension( parser );
			} );
			this.register( function ( parser ) {
				return new GLTFMaterialsIorExtension( parser );
			} );
			this.register( function ( parser ) {
				return new GLTFMaterialsEmissiveStrengthExtension( parser );
			} );
			this.register( function ( parser ) {
				return new GLTFMaterialsSpecularExtension( parser );
			} );
			this.register( function ( parser ) {
				return new GLTFMaterialsIridescenceExtension( parser );
			} );
			this.register( function ( parser ) {
				return new GLTFMaterialsAnisotropyExtension( parser );
			} );
			this.register( function ( parser ) {
				return new GLTFMaterialsBumpExtension( parser );
			} );
			this.register( function ( parser ) {
				return new GLTFLightsExtension( parser );
			} );
			this.register( function ( parser ) {
				return new GLTFMeshoptCompression( parser );
			} );
			this.register( function ( parser ) {
				return new GLTFMeshGpuInstancing( parser );
			} );
		}
		load( url, onLoad, onProgress, onError ) {
			const scope = this;
			let resourcePath;
			if ( this.resourcePath !== '' ) {
				resourcePath = this.resourcePath;
			} else if ( this.path !== '' ) {
				const relativeUrl = three.LoaderUtils.extractUrlBase( url );
				resourcePath = three.LoaderUtils.resolveURL( relativeUrl, this.path );
			} else {
				resourcePath = three.LoaderUtils.extractUrlBase( url );
			}
			this.manager.itemStart( url );
			const _onError = function ( e ) {
				if ( onError ) {
					onError( e );
				} else {
					console.error( e );
				}
				scope.manager.itemError( url );
				scope.manager.itemEnd( url );
			};
			const loader = new three.FileLoader( this.manager );
			loader.setPath( this.path );
			loader.setResponseType( 'arraybuffer' );
			loader.setRequestHeader( this.requestHeader );
			loader.setWithCredentials( this.withCredentials );
			loader.load( url, function ( data ) {
				try {
					scope.parse( data, resourcePath, function ( gltf ) {
						onLoad( gltf );
						scope.manager.itemEnd( url );
					}, _onError );
				} catch ( e ) {
					_onError( e );
				}
			}, onProgress, _onError );
		}
		setDRACOLoader( dracoLoader ) {
			this.dracoLoader = dracoLoader;
			return this;
		}
		setKTX2Loader( ktx2Loader ) {
			this.ktx2Loader = ktx2Loader;
			return this;
		}
		setMeshoptDecoder( meshoptDecoder ) {
			this.meshoptDecoder = meshoptDecoder;
			return this;
		}
		register( callback ) {
			if ( this.pluginCallbacks.indexOf( callback ) === -1 ) {
				this.pluginCallbacks.push( callback );
			}
			return this;
		}
		unregister( callback ) {
			if ( this.pluginCallbacks.indexOf( callback ) !== -1 ) {
				this.pluginCallbacks.splice( this.pluginCallbacks.indexOf( callback ), 1 );
			}
			return this;
		}
		parse( data, path, onLoad, onError ) {
			let json;
			const extensions = {};
			const plugins = {};
			const textDecoder = new TextDecoder();
			if ( typeof data === 'string' ) {
				json = JSON.parse( data );
			} else if ( data instanceof ArrayBuffer ) {
				const magic = textDecoder.decode( new Uint8Array( data, 0, 4 ) );
				if ( magic === BINARY_EXTENSION_HEADER_MAGIC ) {
					try {
						extensions[ EXTENSIONS.KHR_BINARY_GLTF ] = new GLTFBinaryExtension( data );
					} catch ( error ) {
						if ( onError ) onError( error );
						return;
					}
					json = JSON.parse( extensions[ EXTENSIONS.KHR_BINARY_GLTF ].content );
				} else {
					json = JSON.parse( textDecoder.decode( data ) );
				}
			} else {
				json = data;
			}
			if ( json.asset === undefined || json.asset.version[ 0 ] < 2 ) {
				if ( onError ) onError( new Error( 'THREE.GLTFLoader: Unsupported asset. glTF versions >=2.0 are supported.' ) );
				return;
			}
			const parser = new GLTFParser( json, {
				path: path || this.resourcePath || '',
				crossOrigin: this.crossOrigin,
				requestHeader: this.requestHeader,
				manager: this.manager,
				ktx2Loader: this.ktx2Loader,
				meshoptDecoder: this.meshoptDecoder
			} );
			parser.fileLoader.setRequestHeader( this.requestHeader );
			for ( let i = 0; i < this.pluginCallbacks.length; i ++ ) {
				const plugin = this.pluginCallbacks[ i ]( parser );
				if ( ! plugin.name ) console.error( 'THREE.GLTFLoader: Invalid plugin found: missing name' );
				plugins[ plugin.name ] = plugin;
				extensions[ plugin.name ] = true;
			}
			if ( json.extensionsUsed ) {
				for ( let i = 0; i < json.extensionsUsed.length; ++ i ) {
					const extensionName = json.extensionsUsed[ i ];
					const extensionsRequired = json.extensionsRequired || [];
					switch ( extensionName ) {
						case EXTENSIONS.KHR_MATERIALS_UNLIT:
							extensions[ extensionName ] = new GLTFMaterialsUnlitExtension();
							break;
						case EXTENSIONS.KHR_DRACO_MESH_COMPRESSION:
							extensions[ extensionName ] = new GLTFDracoMeshCompressionExtension( json, this.dracoLoader );
							break;
						case EXTENSIONS.KHR_TEXTURE_TRANSFORM:
							extensions[ extensionName ] = new GLTFTextureTransformExtension();
							break;
						case EXTENSIONS.KHR_MESH_QUANTIZATION:
							extensions[ extensionName ] = new GLTFMeshQuantizationExtension();
							break;
						default:
							if ( extensionsRequired.indexOf( extensionName ) >= 0 && plugins[ extensionName ] === undefined ) {
								console.warn( 'THREE.GLTFLoader: Unknown extension "' + extensionName + '".' );
							}
					}
				}
			}
			parser.setExtensions( extensions );
			parser.setPlugins( plugins );
			parser.parse( onLoad, onError );
		}
		parseAsync( data, path ) {
			const scope = this;
			return new Promise( function ( resolve, reject ) {
				scope.parse( data, path, resolve, reject );
			} );
		}
	}
	function GLTFRegistry() {
		let objects = {};
		return	{
			get: function ( key ) {
				return objects[ key ];
			},
			add: function ( key, object ) {
				objects[ key ] = object;
			},
			remove: function ( key ) {
				delete objects[ key ];
			},
			removeAll: function () {
				objects = {};
			}
		};
	}
	const EXTENSIONS = {
		KHR_BINARY_GLTF: 'KHR_binary_glTF',
		KHR_DRACO_MESH_COMPRESSION: 'KHR_draco_mesh_compression',
		KHR_LIGHTS_PUNCTUAL: 'KHR_lights_punctual',
		KHR_MATERIALS_CLEARCOAT: 'KHR_materials_clearcoat',
		KHR_MATERIALS_DISPERSION: 'KHR_materials_dispersion',
		KHR_MATERIALS_IOR: 'KHR_materials_ior',
		KHR_MATERIALS_SHEEN: 'KHR_materials_sheen',
		KHR_MATERIALS_SPECULAR: 'KHR_materials_specular',
		KHR_MATERIALS_TRANSMISSION: 'KHR_materials_transmission',
		KHR_MATERIALS_IRIDESCENCE: 'KHR_materials_iridescence',
		KHR_MATERIALS_ANISOTROPY: 'KHR_materials_anisotropy',
		KHR_MATERIALS_UNLIT: 'KHR_materials_unlit',
		KHR_MATERIALS_VOLUME: 'KHR_materials_volume',
		KHR_TEXTURE_BASISU: 'KHR_texture_basisu',
		KHR_TEXTURE_TRANSFORM: 'KHR_texture_transform',
		KHR_MESH_QUANTIZATION: 'KHR_mesh_quantization',
		KHR_MATERIALS_EMISSIVE_STRENGTH: 'KHR_materials_emissive_strength',
		EXT_MATERIALS_BUMP: 'EXT_materials_bump',
		EXT_TEXTURE_WEBP: 'EXT_texture_webp',
		EXT_TEXTURE_AVIF: 'EXT_texture_avif',
		EXT_MESHOPT_COMPRESSION: 'EXT_meshopt_compression',
		EXT_MESH_GPU_INSTANCING: 'EXT_mesh_gpu_instancing'
	};
	class GLTFLightsExtension {
		constructor( parser ) {
			this.parser = parser;
			this.name = EXTENSIONS.KHR_LIGHTS_PUNCTUAL;
			this.cache = { refs: {}, uses: {} };
		}
		_markDefs() {
			const parser = this.parser;
			const nodeDefs = this.parser.json.nodes || [];
			for ( let nodeIndex = 0, nodeLength = nodeDefs.length; nodeIndex < nodeLength; nodeIndex ++ ) {
				const nodeDef = nodeDefs[ nodeIndex ];
				if ( nodeDef.extensions
						&& nodeDef.extensions[ this.name ]
						&& nodeDef.extensions[ this.name ].light !== undefined ) {
					parser._addNodeRef( this.cache, nodeDef.extensions[ this.name ].light );
				}
			}
		}
		_loadLight( lightIndex ) {
			const parser = this.parser;
			const cacheKey = 'light:' + lightIndex;
			let dependency = parser.cache.get( cacheKey );
			if ( dependency ) return dependency;
			const json = parser.json;
			const extensions = ( json.extensions && json.extensions[ this.name ] ) || {};
			const lightDefs = extensions.lights || [];
			const lightDef = lightDefs[ lightIndex ];
			let lightNode;
			const color = new three.Color( 0xffffff );
			if ( lightDef.color !== undefined ) color.setRGB( lightDef.color[ 0 ], lightDef.color[ 1 ], lightDef.color[ 2 ], three.LinearSRGBColorSpace );
			const range = lightDef.range !== undefined ? lightDef.range : 0;
			switch ( lightDef.type ) {
				case 'directional':
					lightNode = new three.DirectionalLight( color );
					lightNode.target.position.set( 0, 0, -1 );
					lightNode.add( lightNode.target );
					break;
				case 'point':
					lightNode = new three.PointLight( color );
					lightNode.distance = range;
					break;
				case 'spot':
					lightNode = new three.SpotLight( color );
					lightNode.distance = range;
					lightDef.spot = lightDef.spot || {};
					lightDef.spot.innerConeAngle = lightDef.spot.innerConeAngle !== undefined ? lightDef.spot.innerConeAngle : 0;
					lightDef.spot.outerConeAngle = lightDef.spot.outerConeAngle !== undefined ? lightDef.spot.outerConeAngle : Math.PI / 4.0;
					lightNode.angle = lightDef.spot.outerConeAngle;
					lightNode.penumbra = 1.0 - lightDef.spot.innerConeAngle / lightDef.spot.outerConeAngle;
					lightNode.target.position.set( 0, 0, -1 );
					lightNode.add( lightNode.target );
					break;
				default:
					throw new Error( 'THREE.GLTFLoader: Unexpected light type: ' + lightDef.type );
			}
			lightNode.position.set( 0, 0, 0 );
			assignExtrasToUserData( lightNode, lightDef );
			if ( lightDef.intensity !== undefined ) lightNode.intensity = lightDef.intensity;
			lightNode.name = parser.createUniqueName( lightDef.name || ( 'light_' + lightIndex ) );
			dependency = Promise.resolve( lightNode );
			parser.cache.add( cacheKey, dependency );
			return dependency;
		}
		getDependency( type, index ) {
			if ( type !== 'light' ) return;
			return this._loadLight( index );
		}
		createNodeAttachment( nodeIndex ) {
			const self = this;
			const parser = this.parser;
			const json = parser.json;
			const nodeDef = json.nodes[ nodeIndex ];
			const lightDef = ( nodeDef.extensions && nodeDef.extensions[ this.name ] ) || {};
			const lightIndex = lightDef.light;
			if ( lightIndex === undefined ) return null;
			return this._loadLight( lightIndex ).then( function ( light ) {
				return parser._getNodeRef( self.cache, lightIndex, light );
			} );
		}
	}
	class GLTFMaterialsUnlitExtension {
		constructor() {
			this.name = EXTENSIONS.KHR_MATERIALS_UNLIT;
		}
		getMaterialType() {
			return three.MeshBasicMaterial;
		}
		extendParams( materialParams, materialDef, parser ) {
			const pending = [];
			materialParams.color = new three.Color( 1.0, 1.0, 1.0 );
			materialParams.opacity = 1.0;
			const metallicRoughness = materialDef.pbrMetallicRoughness;
			if ( metallicRoughness ) {
				if ( Array.isArray( metallicRoughness.baseColorFactor ) ) {
					const array = metallicRoughness.baseColorFactor;
					materialParams.color.setRGB( array[ 0 ], array[ 1 ], array[ 2 ], three.LinearSRGBColorSpace );
					materialParams.opacity = array[ 3 ];
				}
				if ( metallicRoughness.baseColorTexture !== undefined ) {
					pending.push( parser.assignTexture( materialParams, 'map', metallicRoughness.baseColorTexture, three.SRGBColorSpace ) );
				}
			}
			return Promise.all( pending );
		}
	}
	class GLTFMaterialsEmissiveStrengthExtension {
		constructor( parser ) {
			this.parser = parser;
			this.name = EXTENSIONS.KHR_MATERIALS_EMISSIVE_STRENGTH;
		}
		extendMaterialParams( materialIndex, materialParams ) {
			const parser = this.parser;
			const materialDef = parser.json.materials[ materialIndex ];
			if ( ! materialDef.extensions || ! materialDef.extensions[ this.name ] ) {
				return Promise.resolve();
			}
			const emissiveStrength = materialDef.extensions[ this.name ].emissiveStrength;
			if ( emissiveStrength !== undefined ) {
				materialParams.emissiveIntensity = emissiveStrength;
			}
			return Promise.resolve();
		}
	}
	class GLTFMaterialsClearcoatExtension {
		constructor( parser ) {
			this.parser = parser;
			this.name = EXTENSIONS.KHR_MATERIALS_CLEARCOAT;
		}
		getMaterialType( materialIndex ) {
			const parser = this.parser;
			const materialDef = parser.json.materials[ materialIndex ];
			if ( ! materialDef.extensions || ! materialDef.extensions[ this.name ] ) return null;
			return three.MeshPhysicalMaterial;
		}
		extendMaterialParams( materialIndex, materialParams ) {
			const parser = this.parser;
			const materialDef = parser.json.materials[ materialIndex ];
			if ( ! materialDef.extensions || ! materialDef.extensions[ this.name ] ) {
				return Promise.resolve();
			}
			const pending = [];
			const extension = materialDef.extensions[ this.name ];
			if ( extension.clearcoatFactor !== undefined ) {
				materialParams.clearcoat = extension.clearcoatFactor;
			}
			if ( extension.clearcoatTexture !== undefined ) {
				pending.push( parser.assignTexture( materialParams, 'clearcoatMap', extension.clearcoatTexture ) );
			}
			if ( extension.clearcoatRoughnessFactor !== undefined ) {
				materialParams.clearcoatRoughness = extension.clearcoatRoughnessFactor;
			}
			if ( extension.clearcoatRoughnessTexture !== undefined ) {
				pending.push( parser.assignTexture( materialParams, 'clearcoatRoughnessMap', extension.clearcoatRoughnessTexture ) );
			}
			if ( extension.clearcoatNormalTexture !== undefined ) {
				pending.push( parser.assignTexture( materialParams, 'clearcoatNormalMap', extension.clearcoatNormalTexture ) );
				if ( extension.clearcoatNormalTexture.scale !== undefined ) {
					const scale = extension.clearcoatNormalTexture.scale;
					materialParams.clearcoatNormalScale = new three.Vector2( scale, scale );
				}
			}
			return Promise.all( pending );
		}
	}
	class GLTFMaterialsDispersionExtension {
		constructor( parser ) {
			this.parser = parser;
			this.name = EXTENSIONS.KHR_MATERIALS_DISPERSION;
		}
		getMaterialType( materialIndex ) {
			const parser = this.parser;
			const materialDef = parser.json.materials[ materialIndex ];
			if ( ! materialDef.extensions || ! materialDef.extensions[ this.name ] ) return null;
			return three.MeshPhysicalMaterial;
		}
		extendMaterialParams( materialIndex, materialParams ) {
			const parser = this.parser;
			const materialDef = parser.json.materials[ materialIndex ];
			if ( ! materialDef.extensions || ! materialDef.extensions[ this.name ] ) {
				return Promise.resolve();
			}
			const extension = materialDef.extensions[ this.name ];
			materialParams.dispersion = extension.dispersion !== undefined ? extension.dispersion : 0;
			return Promise.resolve();
		}
	}
	class GLTFMaterialsIridescenceExtension {
		constructor( parser ) {
			this.parser = parser;
			this.name = EXTENSIONS.KHR_MATERIALS_IRIDESCENCE;
		}
		getMaterialType( materialIndex ) {
			const parser = this.parser;
			const materialDef = parser.json.materials[ materialIndex ];
			if ( ! materialDef.extensions || ! materialDef.extensions[ this.name ] ) return null;
			return three.MeshPhysicalMaterial;
		}
		extendMaterialParams( materialIndex, materialParams ) {
			const parser = this.parser;
			const materialDef = parser.json.materials[ materialIndex ];
			if ( ! materialDef.extensions || ! materialDef.extensions[ this.name ] ) {
				return Promise.resolve();
			}
			const pending = [];
			const extension = materialDef.extensions[ this.name ];
			if ( extension.iridescenceFactor !== undefined ) {
				materialParams.iridescence = extension.iridescenceFactor;
			}
			if ( extension.iridescenceTexture !== undefined ) {
				pending.push( parser.assignTexture( materialParams, 'iridescenceMap', extension.iridescenceTexture ) );
			}
			if ( extension.iridescenceIor !== undefined ) {
				materialParams.iridescenceIOR = extension.iridescenceIor;
			}
			if ( materialParams.iridescenceThicknessRange === undefined ) {
				materialParams.iridescenceThicknessRange = [ 100, 400 ];
			}
			if ( extension.iridescenceThicknessMinimum !== undefined ) {
				materialParams.iridescenceThicknessRange[ 0 ] = extension.iridescenceThicknessMinimum;
			}
			if ( extension.iridescenceThicknessMaximum !== undefined ) {
				materialParams.iridescenceThicknessRange[ 1 ] = extension.iridescenceThicknessMaximum;
			}
			if ( extension.iridescenceThicknessTexture !== undefined ) {
				pending.push( parser.assignTexture( materialParams, 'iridescenceThicknessMap', extension.iridescenceThicknessTexture ) );
			}
			return Promise.all( pending );
		}
	}
	class GLTFMaterialsSheenExtension {
		constructor( parser ) {
			this.parser = parser;
			this.name = EXTENSIONS.KHR_MATERIALS_SHEEN;
		}
		getMaterialType( materialIndex ) {
			const parser = this.parser;
			const materialDef = parser.json.materials[ materialIndex ];
			if ( ! materialDef.extensions || ! materialDef.extensions[ this.name ] ) return null;
			return three.MeshPhysicalMaterial;
		}
		extendMaterialParams( materialIndex, materialParams ) {
			const parser = this.parser;
			const materialDef = parser.json.materials[ materialIndex ];
			if ( ! materialDef.extensions || ! materialDef.extensions[ this.name ] ) {
				return Promise.resolve();
			}
			const pending = [];
			materialParams.sheenColor = new three.Color( 0, 0, 0 );
			materialParams.sheenRoughness = 0;
			materialParams.sheen = 1;
			const extension = materialDef.extensions[ this.name ];
			if ( extension.sheenColorFactor !== undefined ) {
				const colorFactor = extension.sheenColorFactor;
				materialParams.sheenColor.setRGB( colorFactor[ 0 ], colorFactor[ 1 ], colorFactor[ 2 ], three.LinearSRGBColorSpace );
			}
			if ( extension.sheenRoughnessFactor !== undefined ) {
				materialParams.sheenRoughness = extension.sheenRoughnessFactor;
			}
			if ( extension.sheenColorTexture !== undefined ) {
				pending.push( parser.assignTexture( materialParams, 'sheenColorMap', extension.sheenColorTexture, three.SRGBColorSpace ) );
			}
			if ( extension.sheenRoughnessTexture !== undefined ) {
				pending.push( parser.assignTexture( materialParams, 'sheenRoughnessMap', extension.sheenRoughnessTexture ) );
			}
			return Promise.all( pending );
		}
	}
	class GLTFMaterialsTransmissionExtension {
		constructor( parser ) {
			this.parser = parser;
			this.name = EXTENSIONS.KHR_MATERIALS_TRANSMISSION;
		}
		getMaterialType( materialIndex ) {
			const parser = this.parser;
			const materialDef = parser.json.materials[ materialIndex ];
			if ( ! materialDef.extensions || ! materialDef.extensions[ this.name ] ) return null;
			return three.MeshPhysicalMaterial;
		}
		extendMaterialParams( materialIndex, materialParams ) {
			const parser = this.parser;
			const materialDef = parser.json.materials[ materialIndex ];
			if ( ! materialDef.extensions || ! materialDef.extensions[ this.name ] ) {
				return Promise.resolve();
			}
			const pending = [];
			const extension = materialDef.extensions[ this.name ];
			if ( extension.transmissionFactor !== undefined ) {
				materialParams.transmission = extension.transmissionFactor;
			}
			if ( extension.transmissionTexture !== undefined ) {
				pending.push( parser.assignTexture( materialParams, 'transmissionMap', extension.transmissionTexture ) );
			}
			return Promise.all( pending );
		}
	}
	class GLTFMaterialsVolumeExtension {
		constructor( parser ) {
			this.parser = parser;
			this.name = EXTENSIONS.KHR_MATERIALS_VOLUME;
		}
		getMaterialType( materialIndex ) {
			const parser = this.parser;
			const materialDef = parser.json.materials[ materialIndex ];
			if ( ! materialDef.extensions || ! materialDef.extensions[ this.name ] ) return null;
			return three.MeshPhysicalMaterial;
		}
		extendMaterialParams( materialIndex, materialParams ) {
			const parser = this.parser;
			const materialDef = parser.json.materials[ materialIndex ];
			if ( ! materialDef.extensions || ! materialDef.extensions[ this.name ] ) {
				return Promise.resolve();
			}
			const pending = [];
			const extension = materialDef.extensions[ this.name ];
			materialParams.thickness = extension.thicknessFactor !== undefined ? extension.thicknessFactor : 0;
			if ( extension.thicknessTexture !== undefined ) {
				pending.push( parser.assignTexture( materialParams, 'thicknessMap', extension.thicknessTexture ) );
			}
			materialParams.attenuationDistance = extension.attenuationDistance || Infinity;
			const colorArray = extension.attenuationColor || [ 1, 1, 1 ];
			materialParams.attenuationColor = new three.Color().setRGB( colorArray[ 0 ], colorArray[ 1 ], colorArray[ 2 ], three.LinearSRGBColorSpace );
			return Promise.all( pending );
		}
	}
	class GLTFMaterialsIorExtension {
		constructor( parser ) {
			this.parser = parser;
			this.name = EXTENSIONS.KHR_MATERIALS_IOR;
		}
		getMaterialType( materialIndex ) {
			const parser = this.parser;
			const materialDef = parser.json.materials[ materialIndex ];
			if ( ! materialDef.extensions || ! materialDef.extensions[ this.name ] ) return null;
			return three.MeshPhysicalMaterial;
		}
		extendMaterialParams( materialIndex, materialParams ) {
			const parser = this.parser;
			const materialDef = parser.json.materials[ materialIndex ];
			if ( ! materialDef.extensions || ! materialDef.extensions[ this.name ] ) {
				return Promise.resolve();
			}
			const extension = materialDef.extensions[ this.name ];
			materialParams.ior = extension.ior !== undefined ? extension.ior : 1.5;
			return Promise.resolve();
		}
	}
	class GLTFMaterialsSpecularExtension {
		constructor( parser ) {
			this.parser = parser;
			this.name = EXTENSIONS.KHR_MATERIALS_SPECULAR;
		}
		getMaterialType( materialIndex ) {
			const parser = this.parser;
			const materialDef = parser.json.materials[ materialIndex ];
			if ( ! materialDef.extensions || ! materialDef.extensions[ this.name ] ) return null;
			return three.MeshPhysicalMaterial;
		}
		extendMaterialParams( materialIndex, materialParams ) {
			const parser = this.parser;
			const materialDef = parser.json.materials[ materialIndex ];
			if ( ! materialDef.extensions || ! materialDef.extensions[ this.name ] ) {
				return Promise.resolve();
			}
			const pending = [];
			const extension = materialDef.extensions[ this.name ];
			materialParams.specularIntensity = extension.specularFactor !== undefined ? extension.specularFactor : 1.0;
			if ( extension.specularTexture !== undefined ) {
				pending.push( parser.assignTexture( materialParams, 'specularIntensityMap', extension.specularTexture ) );
			}
			const colorArray = extension.specularColorFactor || [ 1, 1, 1 ];
			materialParams.specularColor = new three.Color().setRGB( colorArray[ 0 ], colorArray[ 1 ], colorArray[ 2 ], three.LinearSRGBColorSpace );
			if ( extension.specularColorTexture !== undefined ) {
				pending.push( parser.assignTexture( materialParams, 'specularColorMap', extension.specularColorTexture, three.SRGBColorSpace ) );
			}
			return Promise.all( pending );
		}
	}
	class GLTFMaterialsBumpExtension {
		constructor( parser ) {
			this.parser = parser;
			this.name = EXTENSIONS.EXT_MATERIALS_BUMP;
		}
		getMaterialType( materialIndex ) {
			const parser = this.parser;
			const materialDef = parser.json.materials[ materialIndex ];
			if ( ! materialDef.extensions || ! materialDef.extensions[ this.name ] ) return null;
			return three.MeshPhysicalMaterial;
		}
		extendMaterialParams( materialIndex, materialParams ) {
			const parser = this.parser;
			const materialDef = parser.json.materials[ materialIndex ];
			if ( ! materialDef.extensions || ! materialDef.extensions[ this.name ] ) {
				return Promise.resolve();
			}
			const pending = [];
			const extension = materialDef.extensions[ this.name ];
			materialParams.bumpScale = extension.bumpFactor !== undefined ? extension.bumpFactor : 1.0;
			if ( extension.bumpTexture !== undefined ) {
				pending.push( parser.assignTexture( materialParams, 'bumpMap', extension.bumpTexture ) );
			}
			return Promise.all( pending );
		}
	}
	class GLTFMaterialsAnisotropyExtension {
		constructor( parser ) {
			this.parser = parser;
			this.name = EXTENSIONS.KHR_MATERIALS_ANISOTROPY;
		}
		getMaterialType( materialIndex ) {
			const parser = this.parser;
			const materialDef = parser.json.materials[ materialIndex ];
			if ( ! materialDef.extensions || ! materialDef.extensions[ this.name ] ) return null;
			return three.MeshPhysicalMaterial;
		}
		extendMaterialParams( materialIndex, materialParams ) {
			const parser = this.parser;
			const materialDef = parser.json.materials[ materialIndex ];
			if ( ! materialDef.extensions || ! materialDef.extensions[ this.name ] ) {
				return Promise.resolve();
			}
			const pending = [];
			const extension = materialDef.extensions[ this.name ];
			if ( extension.anisotropyStrength !== undefined ) {
				materialParams.anisotropy = extension.anisotropyStrength;
			}
			if ( extension.anisotropyRotation !== undefined ) {
				materialParams.anisotropyRotation = extension.anisotropyRotation;
			}
			if ( extension.anisotropyTexture !== undefined ) {
				pending.push( parser.assignTexture( materialParams, 'anisotropyMap', extension.anisotropyTexture ) );
			}
			return Promise.all( pending );
		}
	}
	class GLTFTextureBasisUExtension {
		constructor( parser ) {
			this.parser = parser;
			this.name = EXTENSIONS.KHR_TEXTURE_BASISU;
		}
		loadTexture( textureIndex ) {
			const parser = this.parser;
			const json = parser.json;
			const textureDef = json.textures[ textureIndex ];
			if ( ! textureDef.extensions || ! textureDef.extensions[ this.name ] ) {
				return null;
			}
			const extension = textureDef.extensions[ this.name ];
			const loader = parser.options.ktx2Loader;
			if ( ! loader ) {
				if ( json.extensionsRequired && json.extensionsRequired.indexOf( this.name ) >= 0 ) {
					throw new Error( 'THREE.GLTFLoader: setKTX2Loader must be called before loading KTX2 textures' );
				} else {
					return null;
				}
			}
			return parser.loadTextureImage( textureIndex, extension.source, loader );
		}
	}
	class GLTFTextureWebPExtension {
		constructor( parser ) {
			this.parser = parser;
			this.name = EXTENSIONS.EXT_TEXTURE_WEBP;
		}
		loadTexture( textureIndex ) {
			const name = this.name;
			const parser = this.parser;
			const json = parser.json;
			const textureDef = json.textures[ textureIndex ];
			if ( ! textureDef.extensions || ! textureDef.extensions[ name ] ) {
				return null;
			}
			const extension = textureDef.extensions[ name ];
			const source = json.images[ extension.source ];
			let loader = parser.textureLoader;
			if ( source.uri ) {
				const handler = parser.options.manager.getHandler( source.uri );
				if ( handler !== null ) loader = handler;
			}
			return parser.loadTextureImage( textureIndex, extension.source, loader );
		}
	}
	class GLTFTextureAVIFExtension {
		constructor( parser ) {
			this.parser = parser;
			this.name = EXTENSIONS.EXT_TEXTURE_AVIF;
		}
		loadTexture( textureIndex ) {
			const name = this.name;
			const parser = this.parser;
			const json = parser.json;
			const textureDef = json.textures[ textureIndex ];
			if ( ! textureDef.extensions || ! textureDef.extensions[ name ] ) {
				return null;
			}
			const extension = textureDef.extensions[ name ];
			const source = json.images[ extension.source ];
			let loader = parser.textureLoader;
			if ( source.uri ) {
				const handler = parser.options.manager.getHandler( source.uri );
				if ( handler !== null ) loader = handler;
			}
			return parser.loadTextureImage( textureIndex, extension.source, loader );
		}
	}
	class GLTFMeshoptCompression {
		constructor( parser ) {
			this.name = EXTENSIONS.EXT_MESHOPT_COMPRESSION;
			this.parser = parser;
		}
		loadBufferView( index ) {
			const json = this.parser.json;
			const bufferView = json.bufferViews[ index ];
			if ( bufferView.extensions && bufferView.extensions[ this.name ] ) {
				const extensionDef = bufferView.extensions[ this.name ];
				const buffer = this.parser.getDependency( 'buffer', extensionDef.buffer );
				const decoder = this.parser.options.meshoptDecoder;
				if ( ! decoder || ! decoder.supported ) {
					if ( json.extensionsRequired && json.extensionsRequired.indexOf( this.name ) >= 0 ) {
						throw new Error( 'THREE.GLTFLoader: setMeshoptDecoder must be called before loading compressed files' );
					} else {
						return null;
					}
				}
				return buffer.then( function ( res ) {
					const byteOffset = extensionDef.byteOffset || 0;
					const byteLength = extensionDef.byteLength || 0;
					const count = extensionDef.count;
					const stride = extensionDef.byteStride;
					const source = new Uint8Array( res, byteOffset, byteLength );
					if ( decoder.decodeGltfBufferAsync ) {
						return decoder.decodeGltfBufferAsync( count, stride, source, extensionDef.mode, extensionDef.filter ).then( function ( res ) {
							return res.buffer;
						} );
					} else {
						return decoder.ready.then( function () {
							const result = new ArrayBuffer( count * stride );
							decoder.decodeGltfBuffer( new Uint8Array( result ), count, stride, source, extensionDef.mode, extensionDef.filter );
							return result;
						} );
					}
				} );
			} else {
				return null;
			}
		}
	}
	class GLTFMeshGpuInstancing {
		constructor( parser ) {
			this.name = EXTENSIONS.EXT_MESH_GPU_INSTANCING;
			this.parser = parser;
		}
		createNodeMesh( nodeIndex ) {
			const json = this.parser.json;
			const nodeDef = json.nodes[ nodeIndex ];
			if ( ! nodeDef.extensions || ! nodeDef.extensions[ this.name ] ||
				nodeDef.mesh === undefined ) {
				return null;
			}
			const meshDef = json.meshes[ nodeDef.mesh ];
			for ( const primitive of meshDef.primitives ) {
				if ( primitive.mode !== WEBGL_CONSTANTS.TRIANGLES &&
					 primitive.mode !== WEBGL_CONSTANTS.TRIANGLE_STRIP &&
					 primitive.mode !== WEBGL_CONSTANTS.TRIANGLE_FAN &&
					 primitive.mode !== undefined ) {
					return null;
				}
			}
			const extensionDef = nodeDef.extensions[ this.name ];
			const attributesDef = extensionDef.attributes;
			const pending = [];
			const attributes = {};
			for ( const key in attributesDef ) {
				pending.push( this.parser.getDependency( 'accessor', attributesDef[ key ] ).then( accessor => {
					attributes[ key ] = accessor;
					return attributes[ key ];
				} ) );
			}
			if ( pending.length < 1 ) {
				return null;
			}
			pending.push( this.parser.createNodeMesh( nodeIndex ) );
			return Promise.all( pending ).then( results => {
				const nodeObject = results.pop();
				const meshes = nodeObject.isGroup ? nodeObject.children : [ nodeObject ];
				const count = results[ 0 ].count;
				const instancedMeshes = [];
				for ( const mesh of meshes ) {
					const m = new three.Matrix4();
					const p = new three.Vector3();
					const q = new three.Quaternion();
					const s = new three.Vector3( 1, 1, 1 );
					const instancedMesh = new three.InstancedMesh( mesh.geometry, mesh.material, count );
					for ( let i = 0; i < count; i ++ ) {
						if ( attributes.TRANSLATION ) {
							p.fromBufferAttribute( attributes.TRANSLATION, i );
						}
						if ( attributes.ROTATION ) {
							q.fromBufferAttribute( attributes.ROTATION, i );
						}
						if ( attributes.SCALE ) {
							s.fromBufferAttribute( attributes.SCALE, i );
						}
						instancedMesh.setMatrixAt( i, m.compose( p, q, s ) );
					}
					for ( const attributeName in attributes ) {
						if ( attributeName === '_COLOR_0' ) {
							const attr = attributes[ attributeName ];
							instancedMesh.instanceColor = new three.InstancedBufferAttribute( attr.array, attr.itemSize, attr.normalized );
						} else if ( attributeName !== 'TRANSLATION' &&
							 attributeName !== 'ROTATION' &&
							 attributeName !== 'SCALE' ) {
							mesh.geometry.setAttribute( attributeName, attributes[ attributeName ] );
						}
					}
					three.Object3D.prototype.copy.call( instancedMesh, mesh );
					this.parser.assignFinalMaterial( instancedMesh );
					instancedMeshes.push( instancedMesh );
				}
				if ( nodeObject.isGroup ) {
					nodeObject.clear();
					nodeObject.add( ... instancedMeshes );
					return nodeObject;
				}
				return instancedMeshes[ 0 ];
			} );
		}
	}
	const BINARY_EXTENSION_HEADER_MAGIC = 'glTF';
	const BINARY_EXTENSION_HEADER_LENGTH = 12;
	const BINARY_EXTENSION_CHUNK_TYPES = { JSON: 0x4E4F534A, BIN: 0x004E4942 };
	class GLTFBinaryExtension {
		constructor( data ) {
			this.name = EXTENSIONS.KHR_BINARY_GLTF;
			this.content = null;
			this.body = null;
			const headerView = new DataView( data, 0, BINARY_EXTENSION_HEADER_LENGTH );
			const textDecoder = new TextDecoder();
			this.header = {
				magic: textDecoder.decode( 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.' );
			}
			const chunkContentsLength = this.header.length - BINARY_EXTENSION_HEADER_LENGTH;
			const chunkView = new DataView( data, BINARY_EXTENSION_HEADER_LENGTH );
			let chunkIndex = 0;
			while ( chunkIndex < chunkContentsLength ) {
				const chunkLength = chunkView.getUint32( chunkIndex, true );
				chunkIndex += 4;
				const chunkType = chunkView.getUint32( chunkIndex, true );
				chunkIndex += 4;
				if ( chunkType === BINARY_EXTENSION_CHUNK_TYPES.JSON ) {
					const contentArray = new Uint8Array( data, BINARY_EXTENSION_HEADER_LENGTH + chunkIndex, chunkLength );
					this.content = textDecoder.decode( contentArray );
				} else if ( chunkType === BINARY_EXTENSION_CHUNK_TYPES.BIN ) {
					const byteOffset = BINARY_EXTENSION_HEADER_LENGTH + chunkIndex;
					this.body = data.slice( byteOffset, byteOffset + chunkLength );
				}
				chunkIndex += chunkLength;
			}
			if ( this.content === null ) {
				throw new Error( 'THREE.GLTFLoader: JSON content not found.' );
			}
		}
	}
	class GLTFDracoMeshCompressionExtension {
		constructor( json, dracoLoader ) {
			if ( ! dracoLoader ) {
				throw new Error( 'THREE.GLTFLoader: No DRACOLoader instance provided.' );
			}
			this.name = EXTENSIONS.KHR_DRACO_MESH_COMPRESSION;
			this.json = json;
			this.dracoLoader = dracoLoader;
			this.dracoLoader.preload();
		}
		decodePrimitive( primitive, parser ) {
			const json = this.json;
			const dracoLoader = this.dracoLoader;
			const bufferViewIndex = primitive.extensions[ this.name ].bufferView;
			const gltfAttributeMap = primitive.extensions[ this.name ].attributes;
			const threeAttributeMap = {};
			const attributeNormalizedMap = {};
			const attributeTypeMap = {};
			for ( const attributeName in gltfAttributeMap ) {
				const threeAttributeName = ATTRIBUTES[ attributeName ] || attributeName.toLowerCase();
				threeAttributeMap[ threeAttributeName ] = gltfAttributeMap[ attributeName ];
			}
			for ( const attributeName in primitive.attributes ) {
				const threeAttributeName = ATTRIBUTES[ attributeName ] || attributeName.toLowerCase();
				if ( gltfAttributeMap[ attributeName ] !== undefined ) {
					const accessorDef = json.accessors[ primitive.attributes[ attributeName ] ];
					const componentType = WEBGL_COMPONENT_TYPES[ accessorDef.componentType ];
					attributeTypeMap[ threeAttributeName ] = componentType.name;
					attributeNormalizedMap[ threeAttributeName ] = accessorDef.normalized === true;
				}
			}
			return parser.getDependency( 'bufferView', bufferViewIndex ).then( function ( bufferView ) {
				return new Promise( function ( resolve, reject ) {
					dracoLoader.decodeDracoFile( bufferView, function ( geometry ) {
						for ( const attributeName in geometry.attributes ) {
							const attribute = geometry.attributes[ attributeName ];
							const normalized = attributeNormalizedMap[ attributeName ];
							if ( normalized !== undefined ) attribute.normalized = normalized;
						}
						resolve( geometry );
					}, threeAttributeMap, attributeTypeMap, three.LinearSRGBColorSpace, reject );
				} );
			} );
		}
	}
	class GLTFTextureTransformExtension {
		constructor() {
			this.name = EXTENSIONS.KHR_TEXTURE_TRANSFORM;
		}
		extendTexture( texture, transform ) {
			if ( ( transform.texCoord === undefined || transform.texCoord === texture.channel )
				&& transform.offset === undefined
				&& transform.rotation === undefined
				&& transform.scale === undefined ) {
				return texture;
			}
			texture = texture.clone();
			if ( transform.texCoord !== undefined ) {
				texture.channel = transform.texCoord;
			}
			if ( transform.offset !== undefined ) {
				texture.offset.fromArray( transform.offset );
			}
			if ( transform.rotation !== undefined ) {
				texture.rotation = transform.rotation;
			}
			if ( transform.scale !== undefined ) {
				texture.repeat.fromArray( transform.scale );
			}
			texture.needsUpdate = true;
			return texture;
		}
	}
	class GLTFMeshQuantizationExtension {
		constructor() {
			this.name = EXTENSIONS.KHR_MESH_QUANTIZATION;
		}
	}
	class GLTFCubicSplineInterpolant extends three.Interpolant {
		constructor( parameterPositions, sampleValues, sampleSize, resultBuffer ) {
			super( parameterPositions, sampleValues, sampleSize, resultBuffer );
		}
		copySampleValue_( index ) {
			const result = this.resultBuffer,
				values = this.sampleValues,
				valueSize = this.valueSize,
				offset = index * valueSize * 3 + valueSize;
			for ( let i = 0; i !== valueSize; i ++ ) {
				result[ i ] = values[ offset + i ];
			}
			return result;
		}
		interpolate_( i1, t0, t, t1 ) {
			const result = this.resultBuffer;
			const values = this.sampleValues;
			const stride = this.valueSize;
			const stride2 = stride * 2;
			const stride3 = stride * 3;
			const td = t1 - t0;
			const p = ( t - t0 ) / td;
			const pp = p * p;
			const ppp = pp * p;
			const offset1 = i1 * stride3;
			const offset0 = offset1 - stride3;
			const s2 = -2 * ppp + 3 * pp;
			const s3 = ppp - pp;
			const s0 = 1 - s2;
			const s1 = s3 - pp + p;
			for ( let i = 0; i !== stride; i ++ ) {
				const p0 = values[ offset0 + i + stride ];
				const m0 = values[ offset0 + i + stride2 ] * td;
				const p1 = values[ offset1 + i + stride ];
				const m1 = values[ offset1 + i ] * td;
				result[ i ] = s0 * p0 + s1 * m0 + s2 * p1 + s3 * m1;
			}
			return result;
		}
	}
	const _quaternion = new three.Quaternion();
	class GLTFCubicSplineQuaternionInterpolant extends GLTFCubicSplineInterpolant {
		interpolate_( i1, t0, t, t1 ) {
			const result = super.interpolate_( i1, t0, t, t1 );
			_quaternion.fromArray( result ).normalize().toArray( result );
			return result;
		}
	}
	const WEBGL_CONSTANTS = {
		POINTS: 0,
		LINES: 1,
		LINE_LOOP: 2,
		LINE_STRIP: 3,
		TRIANGLES: 4,
		TRIANGLE_STRIP: 5,
		TRIANGLE_FAN: 6};
	const WEBGL_COMPONENT_TYPES = {
		5120: Int8Array,
		5121: Uint8Array,
		5122: Int16Array,
		5123: Uint16Array,
		5125: Uint32Array,
		5126: Float32Array
	};
	const WEBGL_FILTERS = {
		9728: three.NearestFilter,
		9729: three.LinearFilter,
		9984: three.NearestMipmapNearestFilter,
		9985: three.LinearMipmapNearestFilter,
		9986: three.NearestMipmapLinearFilter,
		9987: three.LinearMipmapLinearFilter
	};
	const WEBGL_WRAPPINGS = {
		33071: three.ClampToEdgeWrapping,
		33648: three.MirroredRepeatWrapping,
		10497: three.RepeatWrapping
	};
	const WEBGL_TYPE_SIZES = {
		'SCALAR': 1,
		'VEC2': 2,
		'VEC3': 3,
		'VEC4': 4,
		'MAT2': 4,
		'MAT3': 9,
		'MAT4': 16
	};
	const ATTRIBUTES = {
		POSITION: 'position',
		NORMAL: 'normal',
		TANGENT: 'tangent',
		TEXCOORD_0: 'uv',
		TEXCOORD_1: 'uv1',
		TEXCOORD_2: 'uv2',
		TEXCOORD_3: 'uv3',
		COLOR_0: 'color',
		WEIGHTS_0: 'skinWeight',
		JOINTS_0: 'skinIndex',
	};
	const PATH_PROPERTIES = {
		scale: 'scale',
		translation: 'position',
		rotation: 'quaternion',
		weights: 'morphTargetInfluences'
	};
	const INTERPOLATION = {
		CUBICSPLINE: undefined,
		LINEAR: three.InterpolateLinear,
		STEP: three.InterpolateDiscrete
	};
	const ALPHA_MODES = {
		OPAQUE: 'OPAQUE',
		MASK: 'MASK',
		BLEND: 'BLEND'
	};
	function createDefaultMaterial( cache ) {
		if ( cache[ 'DefaultMaterial' ] === undefined ) {
			cache[ 'DefaultMaterial' ] = new three.MeshStandardMaterial( {
				color: 0xFFFFFF,
				emissive: 0x000000,
				metalness: 1,
				roughness: 1,
				transparent: false,
				depthTest: true,
				side: three.FrontSide
			} );
		}
		return cache[ 'DefaultMaterial' ];
	}
	function addUnknownExtensionsToUserData( knownExtensions, object, objectDef ) {
		for ( const name in objectDef.extensions ) {
			if ( knownExtensions[ name ] === undefined ) {
				object.userData.gltfExtensions = object.userData.gltfExtensions || {};
				object.userData.gltfExtensions[ name ] = objectDef.extensions[ name ];
			}
		}
	}
	function assignExtrasToUserData( object, gltfDef ) {
		if ( gltfDef.extras !== undefined ) {
			if ( typeof gltfDef.extras === 'object' ) {
				Object.assign( object.userData, gltfDef.extras );
			} else {
				console.warn( 'THREE.GLTFLoader: Ignoring primitive type .extras, ' + gltfDef.extras );
			}
		}
	}
	function addMorphTargets( geometry, targets, parser ) {
		let hasMorphPosition = false;
		let hasMorphNormal = false;
		let hasMorphColor = false;
		for ( let i = 0, il = targets.length; i < il; i ++ ) {
			const target = targets[ i ];
			if ( target.POSITION !== undefined ) hasMorphPosition = true;
			if ( target.NORMAL !== undefined ) hasMorphNormal = true;
			if ( target.COLOR_0 !== undefined ) hasMorphColor = true;
			if ( hasMorphPosition && hasMorphNormal && hasMorphColor ) break;
		}
		if ( ! hasMorphPosition && ! hasMorphNormal && ! hasMorphColor ) return Promise.resolve( geometry );
		const pendingPositionAccessors = [];
		const pendingNormalAccessors = [];
		const pendingColorAccessors = [];
		for ( let i = 0, il = targets.length; i < il; i ++ ) {
			const target = targets[ i ];
			if ( hasMorphPosition ) {
				const pendingAccessor = target.POSITION !== undefined
					? parser.getDependency( 'accessor', target.POSITION )
					: geometry.attributes.position;
				pendingPositionAccessors.push( pendingAccessor );
			}
			if ( hasMorphNormal ) {
				const pendingAccessor = target.NORMAL !== undefined
					? parser.getDependency( 'accessor', target.NORMAL )
					: geometry.attributes.normal;
				pendingNormalAccessors.push( pendingAccessor );
			}
			if ( hasMorphColor ) {
				const pendingAccessor = target.COLOR_0 !== undefined
					? parser.getDependency( 'accessor', target.COLOR_0 )
					: geometry.attributes.color;
				pendingColorAccessors.push( pendingAccessor );
			}
		}
		return Promise.all( [
			Promise.all( pendingPositionAccessors ),
			Promise.all( pendingNormalAccessors ),
			Promise.all( pendingColorAccessors )
		] ).then( function ( accessors ) {
			const morphPositions = accessors[ 0 ];
			const morphNormals = accessors[ 1 ];
			const morphColors = accessors[ 2 ];
			if ( hasMorphPosition ) geometry.morphAttributes.position = morphPositions;
			if ( hasMorphNormal ) geometry.morphAttributes.normal = morphNormals;
			if ( hasMorphColor ) geometry.morphAttributes.color = morphColors;
			geometry.morphTargetsRelative = true;
			return geometry;
		} );
	}
	function updateMorphTargets( mesh, meshDef ) {
		mesh.updateMorphTargets();
		if ( meshDef.weights !== undefined ) {
			for ( let i = 0, il = meshDef.weights.length; i < il; i ++ ) {
				mesh.morphTargetInfluences[ i ] = meshDef.weights[ i ];
			}
		}
		if ( meshDef.extras && Array.isArray( meshDef.extras.targetNames ) ) {
			const targetNames = meshDef.extras.targetNames;
			if ( mesh.morphTargetInfluences.length === targetNames.length ) {
				mesh.morphTargetDictionary = {};
				for ( let i = 0, il = targetNames.length; i < il; i ++ ) {
					mesh.morphTargetDictionary[ targetNames[ i ] ] = i;
				}
			} else {
				console.warn( 'THREE.GLTFLoader: Invalid extras.targetNames length. Ignoring names.' );
			}
		}
	}
	function createPrimitiveKey( primitiveDef ) {
		let geometryKey;
		const dracoExtension = primitiveDef.extensions && primitiveDef.extensions[ EXTENSIONS.KHR_DRACO_MESH_COMPRESSION ];
		if ( dracoExtension ) {
			geometryKey = 'draco:' + dracoExtension.bufferView
					+ ':' + dracoExtension.indices
					+ ':' + createAttributesKey( dracoExtension.attributes );
		} else {
			geometryKey = primitiveDef.indices + ':' + createAttributesKey( primitiveDef.attributes ) + ':' + primitiveDef.mode;
		}
		if ( primitiveDef.targets !== undefined ) {
			for ( let i = 0, il = primitiveDef.targets.length; i < il; i ++ ) {
				geometryKey += ':' + createAttributesKey( primitiveDef.targets[ i ] );
			}
		}
		return geometryKey;
	}
	function createAttributesKey( attributes ) {
		let attributesKey = '';
		const keys = Object.keys( attributes ).sort();
		for ( let i = 0, il = keys.length; i < il; i ++ ) {
			attributesKey += keys[ i ] + ':' + attributes[ keys[ i ] ] + ';';
		}
		return attributesKey;
	}
	function getNormalizedComponentScale( constructor ) {
		switch ( constructor ) {
			case Int8Array:
				return 1 / 127;
			case Uint8Array:
				return 1 / 255;
			case Int16Array:
				return 1 / 32767;
			case Uint16Array:
				return 1 / 65535;
			default:
				throw new Error( 'THREE.GLTFLoader: Unsupported normalized accessor component type.' );
		}
	}
	function getImageURIMimeType( uri ) {
		if ( uri.search( /\.jpe?g($|\?)/i ) > 0 || uri.search( /^data\:image\/jpeg/ ) === 0 ) return 'image/jpeg';
		if ( uri.search( /\.webp($|\?)/i ) > 0 || uri.search( /^data\:image\/webp/ ) === 0 ) return 'image/webp';
		if ( uri.search( /\.ktx2($|\?)/i ) > 0 || uri.search( /^data\:image\/ktx2/ ) === 0 ) return 'image/ktx2';
		return 'image/png';
	}
	const _identityMatrix = new three.Matrix4();
	class GLTFParser {
		constructor( json = {}, options = {} ) {
			this.json = json;
			this.extensions = {};
			this.plugins = {};
			this.options = options;
			this.cache = new GLTFRegistry();
			this.associations = new Map();
			this.primitiveCache = {};
			this.nodeCache = {};
			this.meshCache = { refs: {}, uses: {} };
			this.cameraCache = { refs: {}, uses: {} };
			this.lightCache = { refs: {}, uses: {} };
			this.sourceCache = {};
			this.textureCache = {};
			this.nodeNamesUsed = {};
			let isSafari = false;
			let safariVersion = -1;
			let isFirefox = false;
			let firefoxVersion = -1;
			if ( typeof navigator !== 'undefined' ) {
				const userAgent = navigator.userAgent;
				isSafari = /^((?!chrome|android).)*safari/i.test( userAgent ) === true;
				const safariMatch = userAgent.match( /Version\/(\d+)/ );
				safariVersion = isSafari && safariMatch ? parseInt( safariMatch[ 1 ], 10 ) : -1;
				isFirefox = userAgent.indexOf( 'Firefox' ) > -1;
				firefoxVersion = isFirefox ? userAgent.match( /Firefox\/([0-9]+)\./ )[ 1 ] : -1;
			}
			if ( typeof createImageBitmap === 'undefined' || ( isSafari && safariVersion < 17 ) || ( isFirefox && firefoxVersion < 98 ) ) {
				this.textureLoader = new three.TextureLoader( this.options.manager );
			} else {
				this.textureLoader = new three.ImageBitmapLoader( this.options.manager );
			}
			this.textureLoader.setCrossOrigin( this.options.crossOrigin );
			this.textureLoader.setRequestHeader( this.options.requestHeader );
			this.fileLoader = new three.FileLoader( this.options.manager );
			this.fileLoader.setResponseType( 'arraybuffer' );
			if ( this.options.crossOrigin === 'use-credentials' ) {
				this.fileLoader.setWithCredentials( true );
			}
		}
		setExtensions( extensions ) {
			this.extensions = extensions;
		}
		setPlugins( plugins ) {
			this.plugins = plugins;
		}
		parse( onLoad, onError ) {
			const parser = this;
			const json = this.json;
			const extensions = this.extensions;
			this.cache.removeAll();
			this.nodeCache = {};
			this._invokeAll( function ( ext ) {
				return ext._markDefs && ext._markDefs();
			} );
			Promise.all( this._invokeAll( function ( ext ) {
				return ext.beforeRoot && ext.beforeRoot();
			} ) ).then( function () {
				return Promise.all( [
					parser.getDependencies( 'scene' ),
					parser.getDependencies( 'animation' ),
					parser.getDependencies( 'camera' ),
				] );
			} ).then( function ( dependencies ) {
				const result = {
					scene: dependencies[ 0 ][ json.scene || 0 ],
					scenes: dependencies[ 0 ],
					animations: dependencies[ 1 ],
					cameras: dependencies[ 2 ],
					asset: json.asset,
					parser: parser,
					userData: {}
				};
				addUnknownExtensionsToUserData( extensions, result, json );
				assignExtrasToUserData( result, json );
				return Promise.all( parser._invokeAll( function ( ext ) {
					return ext.afterRoot && ext.afterRoot( result );
				} ) ).then( function () {
					for ( const scene of result.scenes ) {
						scene.updateMatrixWorld();
					}
					onLoad( result );
				} );
			} ).catch( onError );
		}
		_markDefs() {
			const nodeDefs = this.json.nodes || [];
			const skinDefs = this.json.skins || [];
			const meshDefs = this.json.meshes || [];
			for ( let skinIndex = 0, skinLength = skinDefs.length; skinIndex < skinLength; skinIndex ++ ) {
				const joints = skinDefs[ skinIndex ].joints;
				for ( let i = 0, il = joints.length; i < il; i ++ ) {
					nodeDefs[ joints[ i ] ].isBone = true;
				}
			}
			for ( let nodeIndex = 0, nodeLength = nodeDefs.length; nodeIndex < nodeLength; nodeIndex ++ ) {
				const nodeDef = nodeDefs[ nodeIndex ];
				if ( nodeDef.mesh !== undefined ) {
					this._addNodeRef( this.meshCache, nodeDef.mesh );
					if ( nodeDef.skin !== undefined ) {
						meshDefs[ nodeDef.mesh ].isSkinnedMesh = true;
					}
				}
				if ( nodeDef.camera !== undefined ) {
					this._addNodeRef( this.cameraCache, nodeDef.camera );
				}
			}
		}
		_addNodeRef( cache, index ) {
			if ( index === undefined ) return;
			if ( cache.refs[ index ] === undefined ) {
				cache.refs[ index ] = cache.uses[ index ] = 0;
			}
			cache.refs[ index ] ++;
		}
		_getNodeRef( cache, index, object ) {
			if ( cache.refs[ index ] <= 1 ) return object;
			const ref = object.clone();
			const updateMappings = ( original, clone ) => {
				const mappings = this.associations.get( original );
				if ( mappings != null ) {
					this.associations.set( clone, mappings );
				}
				for ( const [ i, child ] of original.children.entries() ) {
					updateMappings( child, clone.children[ i ] );
				}
			};
			updateMappings( object, ref );
			ref.name += '_instance_' + ( cache.uses[ index ] ++ );
			return ref;
		}
		_invokeOne( func ) {
			const extensions = Object.values( this.plugins );
			extensions.push( this );
			for ( let i = 0; i < extensions.length; i ++ ) {
				const result = func( extensions[ i ] );
				if ( result ) return result;
			}
			return null;
		}
		_invokeAll( func ) {
			const extensions = Object.values( this.plugins );
			extensions.unshift( this );
			const pending = [];
			for ( let i = 0; i < extensions.length; i ++ ) {
				const result = func( extensions[ i ] );
				if ( result ) pending.push( result );
			}
			return pending;
		}
		getDependency( type, index ) {
			const cacheKey = type + ':' + index;
			let dependency = this.cache.get( cacheKey );
			if ( ! dependency ) {
				switch ( type ) {
					case 'scene':
						dependency = this.loadScene( index );
						break;
					case 'node':
						dependency = this._invokeOne( function ( ext ) {
							return ext.loadNode && ext.loadNode( index );
						} );
						break;
					case 'mesh':
						dependency = this._invokeOne( function ( ext ) {
							return ext.loadMesh && ext.loadMesh( index );
						} );
						break;
					case 'accessor':
						dependency = this.loadAccessor( index );
						break;
					case 'bufferView':
						dependency = this._invokeOne( function ( ext ) {
							return ext.loadBufferView && ext.loadBufferView( index );
						} );
						break;
					case 'buffer':
						dependency = this.loadBuffer( index );
						break;
					case 'material':
						dependency = this._invokeOne( function ( ext ) {
							return ext.loadMaterial && ext.loadMaterial( index );
						} );
						break;
					case 'texture':
						dependency = this._invokeOne( function ( ext ) {
							return ext.loadTexture && ext.loadTexture( index );
						} );
						break;
					case 'skin':
						dependency = this.loadSkin( index );
						break;
					case 'animation':
						dependency = this._invokeOne( function ( ext ) {
							return ext.loadAnimation && ext.loadAnimation( index );
						} );
						break;
					case 'camera':
						dependency = this.loadCamera( index );
						break;
					default:
						dependency = this._invokeOne( function ( ext ) {
							return ext != this && ext.getDependency && ext.getDependency( type, index );
						} );
						if ( ! dependency ) {
							throw new Error( 'Unknown type: ' + type );
						}
						break;
				}
				this.cache.add( cacheKey, dependency );
			}
			return dependency;
		}
		getDependencies( type ) {
			let dependencies = this.cache.get( type );
			if ( ! dependencies ) {
				const parser = this;
				const defs = this.json[ type + ( type === 'mesh' ? 'es' : 's' ) ] || [];
				dependencies = Promise.all( defs.map( function ( def, index ) {
					return parser.getDependency( type, index );
				} ) );
				this.cache.add( type, dependencies );
			}
			return dependencies;
		}
		loadBuffer( bufferIndex ) {
			const bufferDef = this.json.buffers[ bufferIndex ];
			const loader = this.fileLoader;
			if ( bufferDef.type && bufferDef.type !== 'arraybuffer' ) {
				throw new Error( 'THREE.GLTFLoader: ' + bufferDef.type + ' buffer type is not supported.' );
			}
			if ( bufferDef.uri === undefined && bufferIndex === 0 ) {
				return Promise.resolve( this.extensions[ EXTENSIONS.KHR_BINARY_GLTF ].body );
			}
			const options = this.options;
			return new Promise( function ( resolve, reject ) {
				loader.load( three.LoaderUtils.resolveURL( bufferDef.uri, options.path ), resolve, undefined, function () {
					reject( new Error( 'THREE.GLTFLoader: Failed to load buffer "' + bufferDef.uri + '".' ) );
				} );
			} );
		}
		loadBufferView( bufferViewIndex ) {
			const bufferViewDef = this.json.bufferViews[ bufferViewIndex ];
			return this.getDependency( 'buffer', bufferViewDef.buffer ).then( function ( buffer ) {
				const byteLength = bufferViewDef.byteLength || 0;
				const byteOffset = bufferViewDef.byteOffset || 0;
				return buffer.slice( byteOffset, byteOffset + byteLength );
			} );
		}
		loadAccessor( accessorIndex ) {
			const parser = this;
			const json = this.json;
			const accessorDef = this.json.accessors[ accessorIndex ];
			if ( accessorDef.bufferView === undefined && accessorDef.sparse === undefined ) {
				const itemSize = WEBGL_TYPE_SIZES[ accessorDef.type ];
				const TypedArray = WEBGL_COMPONENT_TYPES[ accessorDef.componentType ];
				const normalized = accessorDef.normalized === true;
				const array = new TypedArray( accessorDef.count * itemSize );
				return Promise.resolve( new three.BufferAttribute( array, itemSize, normalized ) );
			}
			const pendingBufferViews = [];
			if ( accessorDef.bufferView !== undefined ) {
				pendingBufferViews.push( this.getDependency( 'bufferView', accessorDef.bufferView ) );
			} else {
				pendingBufferViews.push( null );
			}
			if ( accessorDef.sparse !== undefined ) {
				pendingBufferViews.push( this.getDependency( 'bufferView', accessorDef.sparse.indices.bufferView ) );
				pendingBufferViews.push( this.getDependency( 'bufferView', accessorDef.sparse.values.bufferView ) );
			}
			return Promise.all( pendingBufferViews ).then( function ( bufferViews ) {
				const bufferView = bufferViews[ 0 ];
				const itemSize = WEBGL_TYPE_SIZES[ accessorDef.type ];
				const TypedArray = WEBGL_COMPONENT_TYPES[ accessorDef.componentType ];
				const elementBytes = TypedArray.BYTES_PER_ELEMENT;
				const itemBytes = elementBytes * itemSize;
				const byteOffset = accessorDef.byteOffset || 0;
				const byteStride = accessorDef.bufferView !== undefined ? json.bufferViews[ accessorDef.bufferView ].byteStride : undefined;
				const normalized = accessorDef.normalized === true;
				let array, bufferAttribute;
				if ( byteStride && byteStride !== itemBytes ) {
					const ibSlice = Math.floor( byteOffset / byteStride );
					const ibCacheKey = 'InterleavedBuffer:' + accessorDef.bufferView + ':' + accessorDef.componentType + ':' + ibSlice + ':' + accessorDef.count;
					let ib = parser.cache.get( ibCacheKey );
					if ( ! ib ) {
						array = new TypedArray( bufferView, ibSlice * byteStride, accessorDef.count * byteStride / elementBytes );
						ib = new three.InterleavedBuffer( array, byteStride / elementBytes );
						parser.cache.add( ibCacheKey, ib );
					}
					bufferAttribute = new three.InterleavedBufferAttribute( ib, itemSize, ( byteOffset % byteStride ) / elementBytes, normalized );
				} else {
					if ( bufferView === null ) {
						array = new TypedArray( accessorDef.count * itemSize );
					} else {
						array = new TypedArray( bufferView, byteOffset, accessorDef.count * itemSize );
					}
					bufferAttribute = new three.BufferAttribute( array, itemSize, normalized );
				}
				if ( accessorDef.sparse !== undefined ) {
					const itemSizeIndices = WEBGL_TYPE_SIZES.SCALAR;
					const TypedArrayIndices = WEBGL_COMPONENT_TYPES[ accessorDef.sparse.indices.componentType ];
					const byteOffsetIndices = accessorDef.sparse.indices.byteOffset || 0;
					const byteOffsetValues = accessorDef.sparse.values.byteOffset || 0;
					const sparseIndices = new TypedArrayIndices( bufferViews[ 1 ], byteOffsetIndices, accessorDef.sparse.count * itemSizeIndices );
					const sparseValues = new TypedArray( bufferViews[ 2 ], byteOffsetValues, accessorDef.sparse.count * itemSize );
					if ( bufferView !== null ) {
						bufferAttribute = new three.BufferAttribute( bufferAttribute.array.slice(), bufferAttribute.itemSize, bufferAttribute.normalized );
					}
					bufferAttribute.normalized = false;
					for ( let i = 0, il = sparseIndices.length; i < il; i ++ ) {
						const index = sparseIndices[ i ];
						bufferAttribute.setX( index, sparseValues[ i * itemSize ] );
						if ( itemSize >= 2 ) bufferAttribute.setY( index, sparseValues[ i * itemSize + 1 ] );
						if ( itemSize >= 3 ) bufferAttribute.setZ( index, sparseValues[ i * itemSize + 2 ] );
						if ( itemSize >= 4 ) bufferAttribute.setW( index, sparseValues[ i * itemSize + 3 ] );
						if ( itemSize >= 5 ) throw new Error( 'THREE.GLTFLoader: Unsupported itemSize in sparse BufferAttribute.' );
					}
					bufferAttribute.normalized = normalized;
				}
				return bufferAttribute;
			} );
		}
		loadTexture( textureIndex ) {
			const json = this.json;
			const options = this.options;
			const textureDef = json.textures[ textureIndex ];
			const sourceIndex = textureDef.source;
			const sourceDef = json.images[ sourceIndex ];
			let loader = this.textureLoader;
			if ( sourceDef.uri ) {
				const handler = options.manager.getHandler( sourceDef.uri );
				if ( handler !== null ) loader = handler;
			}
			return this.loadTextureImage( textureIndex, sourceIndex, loader );
		}
		loadTextureImage( textureIndex, sourceIndex, loader ) {
			const parser = this;
			const json = this.json;
			const textureDef = json.textures[ textureIndex ];
			const sourceDef = json.images[ sourceIndex ];
			const cacheKey = ( sourceDef.uri || sourceDef.bufferView ) + ':' + textureDef.sampler;
			if ( this.textureCache[ cacheKey ] ) {
				return this.textureCache[ cacheKey ];
			}
			const promise = this.loadImageSource( sourceIndex, loader ).then( function ( texture ) {
				texture.flipY = false;
				texture.name = textureDef.name || sourceDef.name || '';
				if ( texture.name === '' && typeof sourceDef.uri === 'string' && sourceDef.uri.startsWith( 'data:image/' ) === false ) {
					texture.name = sourceDef.uri;
				}
				const samplers = json.samplers || {};
				const 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;
				texture.generateMipmaps = ! texture.isCompressedTexture && texture.minFilter !== three.NearestFilter && texture.minFilter !== three.LinearFilter;
				parser.associations.set( texture, { textures: textureIndex } );
				return texture;
			} ).catch( function () {
				return null;
			} );
			this.textureCache[ cacheKey ] = promise;
			return promise;
		}
		loadImageSource( sourceIndex, loader ) {
			const parser = this;
			const json = this.json;
			const options = this.options;
			if ( this.sourceCache[ sourceIndex ] !== undefined ) {
				return this.sourceCache[ sourceIndex ].then( ( texture ) => texture.clone() );
			}
			const sourceDef = json.images[ sourceIndex ];
			const URL = self.URL || self.webkitURL;
			let sourceURI = sourceDef.uri || '';
			let isObjectURL = false;
			if ( sourceDef.bufferView !== undefined ) {
				sourceURI = parser.getDependency( 'bufferView', sourceDef.bufferView ).then( function ( bufferView ) {
					isObjectURL = true;
					const blob = new Blob( [ bufferView ], { type: sourceDef.mimeType } );
					sourceURI = URL.createObjectURL( blob );
					return sourceURI;
				} );
			} else if ( sourceDef.uri === undefined ) {
				throw new Error( 'THREE.GLTFLoader: Image ' + sourceIndex + ' is missing URI and bufferView' );
			}
			const promise = Promise.resolve( sourceURI ).then( function ( sourceURI ) {
				return new Promise( function ( resolve, reject ) {
					let onLoad = resolve;
					if ( loader.isImageBitmapLoader === true ) {
						onLoad = function ( imageBitmap ) {
							const texture = new three.Texture( imageBitmap );
							texture.needsUpdate = true;
							resolve( texture );
						};
					}
					loader.load( three.LoaderUtils.resolveURL( sourceURI, options.path ), onLoad, undefined, reject );
				} );
			} ).then( function ( texture ) {
				if ( isObjectURL === true ) {
					URL.revokeObjectURL( sourceURI );
				}
				assignExtrasToUserData( texture, sourceDef );
				texture.userData.mimeType = sourceDef.mimeType || getImageURIMimeType( sourceDef.uri );
				return texture;
			} ).catch( function ( error ) {
				console.error( 'THREE.GLTFLoader: Couldn\'t load texture', sourceURI );
				throw error;
			} );
			this.sourceCache[ sourceIndex ] = promise;
			return promise;
		}
		assignTexture( materialParams, mapName, mapDef, colorSpace ) {
			const parser = this;
			return this.getDependency( 'texture', mapDef.index ).then( function ( texture ) {
				if ( ! texture ) return null;
				if ( mapDef.texCoord !== undefined && mapDef.texCoord > 0 ) {
					texture = texture.clone();
					texture.channel = mapDef.texCoord;
				}
				if ( parser.extensions[ EXTENSIONS.KHR_TEXTURE_TRANSFORM ] ) {
					const transform = mapDef.extensions !== undefined ? mapDef.extensions[ EXTENSIONS.KHR_TEXTURE_TRANSFORM ] : undefined;
					if ( transform ) {
						const gltfReference = parser.associations.get( texture );
						texture = parser.extensions[ EXTENSIONS.KHR_TEXTURE_TRANSFORM ].extendTexture( texture, transform );
						parser.associations.set( texture, gltfReference );
					}
				}
				if ( colorSpace !== undefined ) {
					texture.colorSpace = colorSpace;
				}
				materialParams[ mapName ] = texture;
				return texture;
			} );
		}
		assignFinalMaterial( mesh ) {
			const geometry = mesh.geometry;
			let material = mesh.material;
			const useDerivativeTangents = geometry.attributes.tangent === undefined;
			const useVertexColors = geometry.attributes.color !== undefined;
			const useFlatShading = geometry.attributes.normal === undefined;
			if ( mesh.isPoints ) {
				const cacheKey = 'PointsMaterial:' + material.uuid;
				let pointsMaterial = this.cache.get( cacheKey );
				if ( ! pointsMaterial ) {
					pointsMaterial = new three.PointsMaterial();
					three.Material.prototype.copy.call( pointsMaterial, material );
					pointsMaterial.color.copy( material.color );
					pointsMaterial.map = material.map;
					pointsMaterial.sizeAttenuation = false;
					this.cache.add( cacheKey, pointsMaterial );
				}
				material = pointsMaterial;
			} else if ( mesh.isLine ) {
				const cacheKey = 'LineBasicMaterial:' + material.uuid;
				let lineMaterial = this.cache.get( cacheKey );
				if ( ! lineMaterial ) {
					lineMaterial = new three.LineBasicMaterial();
					three.Material.prototype.copy.call( lineMaterial, material );
					lineMaterial.color.copy( material.color );
					lineMaterial.map = material.map;
					this.cache.add( cacheKey, lineMaterial );
				}
				material = lineMaterial;
			}
			if ( useDerivativeTangents || useVertexColors || useFlatShading ) {
				let cacheKey = 'ClonedMaterial:' + material.uuid + ':';
				if ( useDerivativeTangents ) cacheKey += 'derivative-tangents:';
				if ( useVertexColors ) cacheKey += 'vertex-colors:';
				if ( useFlatShading ) cacheKey += 'flat-shading:';
				let cachedMaterial = this.cache.get( cacheKey );
				if ( ! cachedMaterial ) {
					cachedMaterial = material.clone();
					if ( useVertexColors ) cachedMaterial.vertexColors = true;
					if ( useFlatShading ) cachedMaterial.flatShading = true;
					if ( useDerivativeTangents ) {
						if ( cachedMaterial.normalScale ) cachedMaterial.normalScale.y *= -1;
						if ( cachedMaterial.clearcoatNormalScale ) cachedMaterial.clearcoatNormalScale.y *= -1;
					}
					this.cache.add( cacheKey, cachedMaterial );
					this.associations.set( cachedMaterial, this.associations.get( material ) );
				}
				material = cachedMaterial;
			}
			mesh.material = material;
		}
		getMaterialType(  ) {
			return three.MeshStandardMaterial;
		}
		loadMaterial( materialIndex ) {
			const parser = this;
			const json = this.json;
			const extensions = this.extensions;
			const materialDef = json.materials[ materialIndex ];
			let materialType;
			const materialParams = {};
			const materialExtensions = materialDef.extensions || {};
			const pending = [];
			if ( materialExtensions[ EXTENSIONS.KHR_MATERIALS_UNLIT ] ) {
				const kmuExtension = extensions[ EXTENSIONS.KHR_MATERIALS_UNLIT ];
				materialType = kmuExtension.getMaterialType();
				pending.push( kmuExtension.extendParams( materialParams, materialDef, parser ) );
			} else {
				const metallicRoughness = materialDef.pbrMetallicRoughness || {};
				materialParams.color = new three.Color( 1.0, 1.0, 1.0 );
				materialParams.opacity = 1.0;
				if ( Array.isArray( metallicRoughness.baseColorFactor ) ) {
					const array = metallicRoughness.baseColorFactor;
					materialParams.color.setRGB( array[ 0 ], array[ 1 ], array[ 2 ], three.LinearSRGBColorSpace );
					materialParams.opacity = array[ 3 ];
				}
				if ( metallicRoughness.baseColorTexture !== undefined ) {
					pending.push( parser.assignTexture( materialParams, 'map', metallicRoughness.baseColorTexture, three.SRGBColorSpace ) );
				}
				materialParams.metalness = metallicRoughness.metallicFactor !== undefined ? metallicRoughness.metallicFactor : 1.0;
				materialParams.roughness = metallicRoughness.roughnessFactor !== undefined ? metallicRoughness.roughnessFactor : 1.0;
				if ( metallicRoughness.metallicRoughnessTexture !== undefined ) {
					pending.push( parser.assignTexture( materialParams, 'metalnessMap', metallicRoughness.metallicRoughnessTexture ) );
					pending.push( parser.assignTexture( materialParams, 'roughnessMap', metallicRoughness.metallicRoughnessTexture ) );
				}
				materialType = this._invokeOne( function ( ext ) {
					return ext.getMaterialType && ext.getMaterialType( materialIndex );
				} );
				pending.push( Promise.all( this._invokeAll( function ( ext ) {
					return ext.extendMaterialParams && ext.extendMaterialParams( materialIndex, materialParams );
				} ) ) );
			}
			if ( materialDef.doubleSided === true ) {
				materialParams.side = three.DoubleSide;
			}
			const alphaMode = materialDef.alphaMode || ALPHA_MODES.OPAQUE;
			if ( alphaMode === ALPHA_MODES.BLEND ) {
				materialParams.transparent = true;
				materialParams.depthWrite = false;
			} else {
				materialParams.transparent = false;
				if ( alphaMode === ALPHA_MODES.MASK ) {
					materialParams.alphaTest = materialDef.alphaCutoff !== undefined ? materialDef.alphaCutoff : 0.5;
				}
			}
			if ( materialDef.normalTexture !== undefined && materialType !== three.MeshBasicMaterial ) {
				pending.push( parser.assignTexture( materialParams, 'normalMap', materialDef.normalTexture ) );
				materialParams.normalScale = new three.Vector2( 1, 1 );
				if ( materialDef.normalTexture.scale !== undefined ) {
					const scale = materialDef.normalTexture.scale;
					materialParams.normalScale.set( scale, scale );
				}
			}
			if ( materialDef.occlusionTexture !== undefined && materialType !== three.MeshBasicMaterial ) {
				pending.push( parser.assignTexture( materialParams, 'aoMap', materialDef.occlusionTexture ) );
				if ( materialDef.occlusionTexture.strength !== undefined ) {
					materialParams.aoMapIntensity = materialDef.occlusionTexture.strength;
				}
			}
			if ( materialDef.emissiveFactor !== undefined && materialType !== three.MeshBasicMaterial ) {
				const emissiveFactor = materialDef.emissiveFactor;
				materialParams.emissive = new three.Color().setRGB( emissiveFactor[ 0 ], emissiveFactor[ 1 ], emissiveFactor[ 2 ], three.LinearSRGBColorSpace );
			}
			if ( materialDef.emissiveTexture !== undefined && materialType !== three.MeshBasicMaterial ) {
				pending.push( parser.assignTexture( materialParams, 'emissiveMap', materialDef.emissiveTexture, three.SRGBColorSpace ) );
			}
			return Promise.all( pending ).then( function () {
				const material = new materialType( materialParams );
				if ( materialDef.name ) material.name = materialDef.name;
				assignExtrasToUserData( material, materialDef );
				parser.associations.set( material, { materials: materialIndex } );
				if ( materialDef.extensions ) addUnknownExtensionsToUserData( extensions, material, materialDef );
				return material;
			} );
		}
		createUniqueName( originalName ) {
			const sanitizedName = three.PropertyBinding.sanitizeNodeName( originalName || '' );
			if ( sanitizedName in this.nodeNamesUsed ) {
				return sanitizedName + '_' + ( ++ this.nodeNamesUsed[ sanitizedName ] );
			} else {
				this.nodeNamesUsed[ sanitizedName ] = 0;
				return sanitizedName;
			}
		}
		loadGeometries( primitives ) {
			const parser = this;
			const extensions = this.extensions;
			const cache = this.primitiveCache;
			function createDracoPrimitive( primitive ) {
				return extensions[ EXTENSIONS.KHR_DRACO_MESH_COMPRESSION ]
					.decodePrimitive( primitive, parser )
					.then( function ( geometry ) {
						return addPrimitiveAttributes( geometry, primitive, parser );
					} );
			}
			const pending = [];
			for ( let i = 0, il = primitives.length; i < il; i ++ ) {
				const primitive = primitives[ i ];
				const cacheKey = createPrimitiveKey( primitive );
				const cached = cache[ cacheKey ];
				if ( cached ) {
					pending.push( cached.promise );
				} else {
					let geometryPromise;
					if ( primitive.extensions && primitive.extensions[ EXTENSIONS.KHR_DRACO_MESH_COMPRESSION ] ) {
						geometryPromise = createDracoPrimitive( primitive );
					} else {
						geometryPromise = addPrimitiveAttributes( new three.BufferGeometry(), primitive, parser );
					}
					cache[ cacheKey ] = { primitive: primitive, promise: geometryPromise };
					pending.push( geometryPromise );
				}
			}
			return Promise.all( pending );
		}
		loadMesh( meshIndex ) {
			const parser = this;
			const json = this.json;
			const extensions = this.extensions;
			const meshDef = json.meshes[ meshIndex ];
			const primitives = meshDef.primitives;
			const pending = [];
			for ( let i = 0, il = primitives.length; i < il; i ++ ) {
				const material = primitives[ i ].material === undefined
					? createDefaultMaterial( this.cache )
					: this.getDependency( 'material', primitives[ i ].material );
				pending.push( material );
			}
			pending.push( parser.loadGeometries( primitives ) );
			return Promise.all( pending ).then( function ( results ) {
				const materials = results.slice( 0, results.length - 1 );
				const geometries = results[ results.length - 1 ];
				const meshes = [];
				for ( let i = 0, il = geometries.length; i < il; i ++ ) {
					const geometry = geometries[ i ];
					const primitive = primitives[ i ];
					let mesh;
					const material = materials[ i ];
					if ( primitive.mode === WEBGL_CONSTANTS.TRIANGLES ||
							primitive.mode === WEBGL_CONSTANTS.TRIANGLE_STRIP ||
							primitive.mode === WEBGL_CONSTANTS.TRIANGLE_FAN ||
							primitive.mode === undefined ) {
						mesh = meshDef.isSkinnedMesh === true
							? new three.SkinnedMesh( geometry, material )
							: new three.Mesh( geometry, material );
						if ( mesh.isSkinnedMesh === true ) {
							mesh.normalizeSkinWeights();
						}
						if ( primitive.mode === WEBGL_CONSTANTS.TRIANGLE_STRIP ) {
							mesh.geometry = toTrianglesDrawMode( mesh.geometry, three.TriangleStripDrawMode );
						} else if ( primitive.mode === WEBGL_CONSTANTS.TRIANGLE_FAN ) {
							mesh.geometry = toTrianglesDrawMode( mesh.geometry, 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 );
					}
					if ( Object.keys( mesh.geometry.morphAttributes ).length > 0 ) {
						updateMorphTargets( mesh, meshDef );
					}
					mesh.name = parser.createUniqueName( meshDef.name || ( 'mesh_' + meshIndex ) );
					assignExtrasToUserData( mesh, meshDef );
					if ( primitive.extensions ) addUnknownExtensionsToUserData( extensions, mesh, primitive );
					parser.assignFinalMaterial( mesh );
					meshes.push( mesh );
				}
				for ( let i = 0, il = meshes.length; i < il; i ++ ) {
					parser.associations.set( meshes[ i ], {
						meshes: meshIndex,
						primitives: i
					} );
				}
				if ( meshes.length === 1 ) {
					if ( meshDef.extensions ) addUnknownExtensionsToUserData( extensions, meshes[ 0 ], meshDef );
					return meshes[ 0 ];
				}
				const group = new three.Group();
				if ( meshDef.extensions ) addUnknownExtensionsToUserData( extensions, group, meshDef );
				parser.associations.set( group, { meshes: meshIndex } );
				for ( let i = 0, il = meshes.length; i < il; i ++ ) {
					group.add( meshes[ i ] );
				}
				return group;
			} );
		}
		loadCamera( cameraIndex ) {
			let camera;
			const cameraDef = this.json.cameras[ cameraIndex ];
			const params = cameraDef[ cameraDef.type ];
			if ( ! params ) {
				console.warn( 'THREE.GLTFLoader: Missing camera parameters.' );
				return;
			}
			if ( cameraDef.type === 'perspective' ) {
				camera = new three.PerspectiveCamera( three.MathUtils.radToDeg( params.yfov ), params.aspectRatio || 1, params.znear || 1, params.zfar || 2e6 );
			} else if ( cameraDef.type === 'orthographic' ) {
				camera = new three.OrthographicCamera( - params.xmag, params.xmag, params.ymag, - params.ymag, params.znear, params.zfar );
			}
			if ( cameraDef.name ) camera.name = this.createUniqueName( cameraDef.name );
			assignExtrasToUserData( camera, cameraDef );
			return Promise.resolve( camera );
		}
		loadSkin( skinIndex ) {
			const skinDef = this.json.skins[ skinIndex ];
			const pending = [];
			for ( let i = 0, il = skinDef.joints.length; i < il; i ++ ) {
				pending.push( this._loadNodeShallow( skinDef.joints[ i ] ) );
			}
			if ( skinDef.inverseBindMatrices !== undefined ) {
				pending.push( this.getDependency( 'accessor', skinDef.inverseBindMatrices ) );
			} else {
				pending.push( null );
			}
			return Promise.all( pending ).then( function ( results ) {
				const inverseBindMatrices = results.pop();
				const jointNodes = results;
				const bones = [];
				const boneInverses = [];
				for ( let i = 0, il = jointNodes.length; i < il; i ++ ) {
					const jointNode = jointNodes[ i ];
					if ( jointNode ) {
						bones.push( jointNode );
						const mat = new three.Matrix4();
						if ( inverseBindMatrices !== null ) {
							mat.fromArray( inverseBindMatrices.array, i * 16 );
						}
						boneInverses.push( mat );
					} else {
						console.warn( 'THREE.GLTFLoader: Joint "%s" could not be found.', skinDef.joints[ i ] );
					}
				}
				return new three.Skeleton( bones, boneInverses );
			} );
		}
		loadAnimation( animationIndex ) {
			const json = this.json;
			const parser = this;
			const animationDef = json.animations[ animationIndex ];
			const animationName = animationDef.name ? animationDef.name : 'animation_' + animationIndex;
			const pendingNodes = [];
			const pendingInputAccessors = [];
			const pendingOutputAccessors = [];
			const pendingSamplers = [];
			const pendingTargets = [];
			for ( let i = 0, il = animationDef.channels.length; i < il; i ++ ) {
				const channel = animationDef.channels[ i ];
				const sampler = animationDef.samplers[ channel.sampler ];
				const target = channel.target;
				const name = target.node;
				const input = animationDef.parameters !== undefined ? animationDef.parameters[ sampler.input ] : sampler.input;
				const output = animationDef.parameters !== undefined ? animationDef.parameters[ sampler.output ] : sampler.output;
				if ( target.node === undefined ) continue;
				pendingNodes.push( this.getDependency( 'node', name ) );
				pendingInputAccessors.push( this.getDependency( 'accessor', input ) );
				pendingOutputAccessors.push( this.getDependency( 'accessor', output ) );
				pendingSamplers.push( sampler );
				pendingTargets.push( target );
			}
			return Promise.all( [
				Promise.all( pendingNodes ),
				Promise.all( pendingInputAccessors ),
				Promise.all( pendingOutputAccessors ),
				Promise.all( pendingSamplers ),
				Promise.all( pendingTargets )
			] ).then( function ( dependencies ) {
				const nodes = dependencies[ 0 ];
				const inputAccessors = dependencies[ 1 ];
				const outputAccessors = dependencies[ 2 ];
				const samplers = dependencies[ 3 ];
				const targets = dependencies[ 4 ];
				const tracks = [];
				for ( let i = 0, il = nodes.length; i < il; i ++ ) {
					const node = nodes[ i ];
					const inputAccessor = inputAccessors[ i ];
					const outputAccessor = outputAccessors[ i ];
					const sampler = samplers[ i ];
					const target = targets[ i ];
					if ( node === undefined ) continue;
					if ( node.updateMatrix ) {
						node.updateMatrix();
					}
					const createdTracks = parser._createAnimationTracks( node, inputAccessor, outputAccessor, sampler, target );
					if ( createdTracks ) {
						for ( let k = 0; k < createdTracks.length; k ++ ) {
							tracks.push( createdTracks[ k ] );
						}
					}
				}
				const animation = new three.AnimationClip( animationName, undefined, tracks );
				assignExtrasToUserData( animation, animationDef );
				return animation;
			} );
		}
		createNodeMesh( nodeIndex ) {
			const json = this.json;
			const parser = this;
			const nodeDef = json.nodes[ nodeIndex ];
			if ( nodeDef.mesh === undefined ) return null;
			return parser.getDependency( 'mesh', nodeDef.mesh ).then( function ( mesh ) {
				const node = parser._getNodeRef( parser.meshCache, nodeDef.mesh, mesh );
				if ( nodeDef.weights !== undefined ) {
					node.traverse( function ( o ) {
						if ( ! o.isMesh ) return;
						for ( let i = 0, il = nodeDef.weights.length; i < il; i ++ ) {
							o.morphTargetInfluences[ i ] = nodeDef.weights[ i ];
						}
					} );
				}
				return node;
			} );
		}
		loadNode( nodeIndex ) {
			const json = this.json;
			const parser = this;
			const nodeDef = json.nodes[ nodeIndex ];
			const nodePending = parser._loadNodeShallow( nodeIndex );
			const childPending = [];
			const childrenDef = nodeDef.children || [];
			for ( let i = 0, il = childrenDef.length; i < il; i ++ ) {
				childPending.push( parser.getDependency( 'node', childrenDef[ i ] ) );
			}
			const skeletonPending = nodeDef.skin === undefined
				? Promise.resolve( null )
				: parser.getDependency( 'skin', nodeDef.skin );
			return Promise.all( [
				nodePending,
				Promise.all( childPending ),
				skeletonPending
			] ).then( function ( results ) {
				const node = results[ 0 ];
				const children = results[ 1 ];
				const skeleton = results[ 2 ];
				if ( skeleton !== null ) {
					node.traverse( function ( mesh ) {
						if ( ! mesh.isSkinnedMesh ) return;
						mesh.bind( skeleton, _identityMatrix );
					} );
				}
				for ( let i = 0, il = children.length; i < il; i ++ ) {
					node.add( children[ i ] );
				}
				return node;
			} );
		}
		_loadNodeShallow( nodeIndex ) {
			const json = this.json;
			const extensions = this.extensions;
			const parser = this;
			if ( this.nodeCache[ nodeIndex ] !== undefined ) {
				return this.nodeCache[ nodeIndex ];
			}
			const nodeDef = json.nodes[ nodeIndex ];
			const nodeName = nodeDef.name ? parser.createUniqueName( nodeDef.name ) : '';
			const pending = [];
			const meshPromise = parser._invokeOne( function ( ext ) {
				return ext.createNodeMesh && ext.createNodeMesh( nodeIndex );
			} );
			if ( meshPromise ) {
				pending.push( meshPromise );
			}
			if ( nodeDef.camera !== undefined ) {
				pending.push( parser.getDependency( 'camera', nodeDef.camera ).then( function ( camera ) {
					return parser._getNodeRef( parser.cameraCache, nodeDef.camera, camera );
				} ) );
			}
			parser._invokeAll( function ( ext ) {
				return ext.createNodeAttachment && ext.createNodeAttachment( nodeIndex );
			} ).forEach( function ( promise ) {
				pending.push( promise );
			} );
			this.nodeCache[ nodeIndex ] = Promise.all( pending ).then( function ( objects ) {
				let node;
				if ( nodeDef.isBone === true ) {
					node = new three.Bone();
				} else if ( objects.length > 1 ) {
					node = new three.Group();
				} else if ( objects.length === 1 ) {
					node = objects[ 0 ];
				} else {
					node = new three.Object3D();
				}
				if ( node !== objects[ 0 ] ) {
					for ( let i = 0, il = objects.length; i < il; i ++ ) {
						node.add( objects[ i ] );
					}
				}
				if ( nodeDef.name ) {
					node.userData.name = nodeDef.name;
					node.name = nodeName;
				}
				assignExtrasToUserData( node, nodeDef );
				if ( nodeDef.extensions ) addUnknownExtensionsToUserData( extensions, node, nodeDef );
				if ( nodeDef.matrix !== undefined ) {
					const matrix = new three.Matrix4();
					matrix.fromArray( nodeDef.matrix );
					node.applyMatrix4( matrix );
				} else {
					if ( nodeDef.translation !== undefined ) {
						node.position.fromArray( nodeDef.translation );
					}
					if ( nodeDef.rotation !== undefined ) {
						node.quaternion.fromArray( nodeDef.rotation );
					}
					if ( nodeDef.scale !== undefined ) {
						node.scale.fromArray( nodeDef.scale );
					}
				}
				if ( ! parser.associations.has( node ) ) {
					parser.associations.set( node, {} );
				} else if ( nodeDef.mesh !== undefined && parser.meshCache.refs[ nodeDef.mesh ] > 1 ) {
					const mapping = parser.associations.get( node );
					parser.associations.set( node, { ...mapping } );
				}
				parser.associations.get( node ).nodes = nodeIndex;
				return node;
			} );
			return this.nodeCache[ nodeIndex ];
		}
		loadScene( sceneIndex ) {
			const extensions = this.extensions;
			const sceneDef = this.json.scenes[ sceneIndex ];
			const parser = this;
			const scene = new three.Group();
			if ( sceneDef.name ) scene.name = parser.createUniqueName( sceneDef.name );
			assignExtrasToUserData( scene, sceneDef );
			if ( sceneDef.extensions ) addUnknownExtensionsToUserData( extensions, scene, sceneDef );
			const nodeIds = sceneDef.nodes || [];
			const pending = [];
			for ( let i = 0, il = nodeIds.length; i < il; i ++ ) {
				pending.push( parser.getDependency( 'node', nodeIds[ i ] ) );
			}
			return Promise.all( pending ).then( function ( nodes ) {
				for ( let i = 0, il = nodes.length; i < il; i ++ ) {
					scene.add( nodes[ i ] );
				}
				const reduceAssociations = ( node ) => {
					const reducedAssociations = new Map();
					for ( const [ key, value ] of parser.associations ) {
						if ( key instanceof three.Material || key instanceof three.Texture ) {
							reducedAssociations.set( key, value );
						}
					}
					node.traverse( ( node ) => {
						const mappings = parser.associations.get( node );
						if ( mappings != null ) {
							reducedAssociations.set( node, mappings );
						}
					} );
					return reducedAssociations;
				};
				parser.associations = reduceAssociations( scene );
				return scene;
			} );
		}
		_createAnimationTracks( node, inputAccessor, outputAccessor, sampler, target ) {
			const tracks = [];
			const targetName = node.name ? node.name : node.uuid;
			const targetNames = [];
			if ( PATH_PROPERTIES[ target.path ] === PATH_PROPERTIES.weights ) {
				node.traverse( function ( object ) {
					if ( object.morphTargetInfluences ) {
						targetNames.push( object.name ? object.name : object.uuid );
					}
				} );
			} else {
				targetNames.push( targetName );
			}
			let 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.translation:
				case PATH_PROPERTIES.scale:
					TypedKeyframeTrack = three.VectorKeyframeTrack;
					break;
				default:
					switch ( outputAccessor.itemSize ) {
						case 1:
							TypedKeyframeTrack = three.NumberKeyframeTrack;
							break;
						case 2:
						case 3:
						default:
							TypedKeyframeTrack = three.VectorKeyframeTrack;
							break;
					}
					break;
			}
			const interpolation = sampler.interpolation !== undefined ? INTERPOLATION[ sampler.interpolation ] : three.InterpolateLinear;
			const outputArray = this._getArrayFromAccessor( outputAccessor );
			for ( let j = 0, jl = targetNames.length; j < jl; j ++ ) {
				const track = new TypedKeyframeTrack(
					targetNames[ j ] + '.' + PATH_PROPERTIES[ target.path ],
					inputAccessor.array,
					outputArray,
					interpolation
				);
				if ( sampler.interpolation === 'CUBICSPLINE' ) {
					this._createCubicSplineTrackInterpolant( track );
				}
				tracks.push( track );
			}
			return tracks;
		}
		_getArrayFromAccessor( accessor ) {
			let outputArray = accessor.array;
			if ( accessor.normalized ) {
				const scale = getNormalizedComponentScale( outputArray.constructor );
				const scaled = new Float32Array( outputArray.length );
				for ( let j = 0, jl = outputArray.length; j < jl; j ++ ) {
					scaled[ j ] = outputArray[ j ] * scale;
				}
				outputArray = scaled;
			}
			return outputArray;
		}
		_createCubicSplineTrackInterpolant( track ) {
			track.createInterpolant = function InterpolantFactoryMethodGLTFCubicSpline( result ) {
				const interpolantType = ( this instanceof three.QuaternionKeyframeTrack ) ? GLTFCubicSplineQuaternionInterpolant : GLTFCubicSplineInterpolant;
				return new interpolantType( this.times, this.values, this.getValueSize() / 3, result );
			};
			track.createInterpolant.isInterpolantFactoryMethodGLTFCubicSpline = true;
		}
	}
	function computeBounds( geometry, primitiveDef, parser ) {
		const attributes = primitiveDef.attributes;
		const box = new three.Box3();
		if ( attributes.POSITION !== undefined ) {
			const accessor = parser.json.accessors[ attributes.POSITION ];
			const min = accessor.min;
			const max = accessor.max;
			if ( min !== undefined && max !== undefined ) {
				box.set(
					new three.Vector3( min[ 0 ], min[ 1 ], min[ 2 ] ),
					new three.Vector3( max[ 0 ], max[ 1 ], max[ 2 ] )
				);
				if ( accessor.normalized ) {
					const boxScale = getNormalizedComponentScale( WEBGL_COMPONENT_TYPES[ accessor.componentType ] );
					box.min.multiplyScalar( boxScale );
					box.max.multiplyScalar( boxScale );
				}
			} else {
				console.warn( 'THREE.GLTFLoader: Missing min/max properties for accessor POSITION.' );
				return;
			}
		} else {
			return;
		}
		const targets = primitiveDef.targets;
		if ( targets !== undefined ) {
			const maxDisplacement = new three.Vector3();
			const vector = new three.Vector3();
			for ( let i = 0, il = targets.length; i < il; i ++ ) {
				const target = targets[ i ];
				if ( target.POSITION !== undefined ) {
					const accessor = parser.json.accessors[ target.POSITION ];
					const min = accessor.min;
					const max = accessor.max;
					if ( min !== undefined && max !== undefined ) {
						vector.setX( Math.max( Math.abs( min[ 0 ] ), Math.abs( max[ 0 ] ) ) );
						vector.setY( Math.max( Math.abs( min[ 1 ] ), Math.abs( max[ 1 ] ) ) );
						vector.setZ( Math.max( Math.abs( min[ 2 ] ), Math.abs( max[ 2 ] ) ) );
						if ( accessor.normalized ) {
							const boxScale = getNormalizedComponentScale( WEBGL_COMPONENT_TYPES[ accessor.componentType ] );
							vector.multiplyScalar( boxScale );
						}
						maxDisplacement.max( vector );
					} else {
						console.warn( 'THREE.GLTFLoader: Missing min/max properties for accessor POSITION.' );
					}
				}
			}
			box.expandByVector( maxDisplacement );
		}
		geometry.boundingBox = box;
		const sphere = new three.Sphere();
		box.getCenter( sphere.center );
		sphere.radius = box.min.distanceTo( box.max ) / 2;
		geometry.boundingSphere = sphere;
	}
	function addPrimitiveAttributes( geometry, primitiveDef, parser ) {
		const attributes = primitiveDef.attributes;
		const pending = [];
		function assignAttributeAccessor( accessorIndex, attributeName ) {
			return parser.getDependency( 'accessor', accessorIndex )
				.then( function ( accessor ) {
					geometry.setAttribute( attributeName, accessor );
				} );
		}
		for ( const gltfAttributeName in attributes ) {
			const threeAttributeName = ATTRIBUTES[ gltfAttributeName ] || gltfAttributeName.toLowerCase();
			if ( threeAttributeName in geometry.attributes ) continue;
			pending.push( assignAttributeAccessor( attributes[ gltfAttributeName ], threeAttributeName ) );
		}
		if ( primitiveDef.indices !== undefined && ! geometry.index ) {
			const accessor = parser.getDependency( 'accessor', primitiveDef.indices ).then( function ( accessor ) {
				geometry.setIndex( accessor );
			} );
			pending.push( accessor );
		}
		if ( three.ColorManagement.workingColorSpace !== three.LinearSRGBColorSpace && 'COLOR_0' in attributes ) {
			console.warn( `THREE.GLTFLoader: Converting vertex colors from "srgb-linear" to "${three.ColorManagement.workingColorSpace}" not supported.` );
		}
		assignExtrasToUserData( geometry, primitiveDef );
		computeBounds( geometry, primitiveDef, parser );
		return Promise.all( pending ).then( function () {
			return primitiveDef.targets !== undefined
				? addMorphTargets( geometry, primitiveDef.targets, parser )
				: geometry;
		} );
	}

	class GLTFFileLoader extends viewerThree.Loader {
	    constructor(viewer) {
	        super();
	        this.viewer = viewer;
	    }
	    dispose() {
	        if (this.manager)
	            this.manager.dispose();
	    }
	    isSupport(file, format) {
	        return ((typeof file === "string" || file instanceof globalThis.File || file instanceof ArrayBuffer) &&
	            /(gltf|glb)$/i.test(format));
	    }
	    async load(file, format, params = {}) {
	        this.manager = new viewerThree.GLTFLoadingManager(file, params);
	        const loader = new GLTFLoader(this.manager);
	        loader.setPath(this.manager.path);
	        loader.setCrossOrigin(params.crossOrigin || loader.crossOrigin);
	        loader.setRequestHeader(params.requestHeader || {});
	        loader.setWithCredentials(params.withCredentials || loader.withCredentials);
	        const progress = (event) => {
	            const { lengthComputable, loaded, total } = event;
	            const progress = lengthComputable ? loaded / total : 1;
	            this.viewer.emitEvent({ type: "geometryprogress", data: progress, file });
	        };
	        const gltf = await loader.loadAsync(this.manager.fileURL, progress);
	        if (!this.viewer.scene)
	            return this;
	        let handle = 1;
	        gltf.scene.traverse((object) => {
	            object.userData = { handle: handle + "", ...object.userData };
	            handle++;
	        });
	        const modelImpl = new viewerThree.ModelImpl(gltf.scene);
	        modelImpl.id = params.modelId || this.extractFileName(file);
	        this.viewer.scene.add(gltf.scene);
	        this.viewer.models.push(modelImpl);
	        this.viewer.syncOptions();
	        this.viewer.syncOverlay();
	        this.viewer.emitEvent({ type: "databasechunk", data: gltf.scene, file });
	        this.viewer.update(true);
	        return this;
	    }
	}
	viewerThree.loaders.registerLoader("gltf-file", (viewer) => new GLTFFileLoader(viewer));

	exports.GLTFFileLoader = GLTFFileLoader;

}));
//# sourceMappingURL=GLTFFileLoader.js.map
