diff --git a/threejs/loaders/GLTFLoader.js b/threejs/loaders/GLTFLoader.js
new file mode 100644
index 0000000000000000000000000000000000000000..440ecb714846d41bcce840bec05eb9dcb5513793
--- /dev/null
+++ b/threejs/loaders/GLTFLoader.js
@@ -0,0 +1,4663 @@
+import {
+ AnimationClip,
+ Bone,
+ Box3,
+ BufferAttribute,
+ BufferGeometry,
+ ClampToEdgeWrapping,
+ Color,
+ ColorManagement,
+ DirectionalLight,
+ DoubleSide,
+ FileLoader,
+ FrontSide,
+ Group,
+ ImageBitmapLoader,
+ InstancedMesh,
+ InterleavedBuffer,
+ InterleavedBufferAttribute,
+ Interpolant,
+ InterpolateDiscrete,
+ InterpolateLinear,
+ Line,
+ LineBasicMaterial,
+ LineLoop,
+ LineSegments,
+ LinearFilter,
+ LinearMipmapLinearFilter,
+ LinearMipmapNearestFilter,
+ LinearSRGBColorSpace,
+ Loader,
+ LoaderUtils,
+ Material,
+ MathUtils,
+ Matrix4,
+ Mesh,
+ MeshBasicMaterial,
+ MeshPhysicalMaterial,
+ MeshStandardMaterial,
+ MirroredRepeatWrapping,
+ NearestFilter,
+ NearestMipmapLinearFilter,
+ NearestMipmapNearestFilter,
+ NumberKeyframeTrack,
+ Object3D,
+ OrthographicCamera,
+ PerspectiveCamera,
+ PointLight,
+ Points,
+ PointsMaterial,
+ PropertyBinding,
+ Quaternion,
+ QuaternionKeyframeTrack,
+ RepeatWrapping,
+ Skeleton,
+ SkinnedMesh,
+ Sphere,
+ SpotLight,
+ Texture,
+ TextureLoader,
+ TriangleFanDrawMode,
+ TriangleStripDrawMode,
+ Vector2,
+ Vector3,
+ VectorKeyframeTrack,
+ SRGBColorSpace,
+ InstancedBufferAttribute
+} from 'three';
+import { toTrianglesDrawMode } from '../utils/BufferGeometryUtils.js';
+
+class GLTFLoader extends 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 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 !== '' ) {
+
+ // If a base path is set, resources will be relative paths from that plus the relative path of the gltf file
+ // Example path = 'https://my-cnd-server.com/', url = 'assets/models/model.gltf'
+ // resourcePath = 'https://my-cnd-server.com/assets/models/'
+ // referenced resource 'model.bin' will be loaded from 'https://my-cnd-server.com/assets/models/model.bin'
+ // referenced resource '../textures/texture.png' will be loaded from 'https://my-cnd-server.com/assets/textures/texture.png'
+ const relativeUrl = LoaderUtils.extractUrlBase( url );
+ resourcePath = LoaderUtils.resolveURL( relativeUrl, this.path );
+
+ } else {
+
+ resourcePath = LoaderUtils.extractUrlBase( url );
+
+ }
+
+ // Tells the LoadingManager to track an extra item, which resolves after
+ // the model is fully loaded. This means the count of items loaded will
+ // be incorrect, but ensures manager.onLoad() does not fire early.
+ 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 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;
+
+ }
+
+ setDDSLoader() {
+
+ throw new Error(
+
+ 'THREE.GLTFLoader: "MSFT_texture_dds" no longer supported. Please update to "KHR_texture_basisu".'
+
+ );
+
+ }
+
+ 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;
+
+ // Workaround to avoid determining as unknown extension
+ // in addUnknownExtensionsToUserData().
+ // Remove this workaround if we move all the existing
+ // extension handlers to plugin system
+ 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 );
+
+ } );
+
+ }
+
+}
+
+/* GLTFREGISTRY */
+
+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 = {};
+
+ }
+
+ };
+
+}
+
+/*********************************/
+/********** EXTENSIONS ***********/
+/*********************************/
+
+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_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'
+};
+
+/**
+ * Punctual Lights Extension
+ *
+ * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_lights_punctual
+ */
+class GLTFLightsExtension {
+
+ constructor( parser ) {
+
+ this.parser = parser;
+ this.name = EXTENSIONS.KHR_LIGHTS_PUNCTUAL;
+
+ // Object3D instance caches
+ 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 Color( 0xffffff );
+
+ if ( lightDef.color !== undefined ) color.setRGB( lightDef.color[ 0 ], lightDef.color[ 1 ], lightDef.color[ 2 ], LinearSRGBColorSpace );
+
+ const range = lightDef.range !== undefined ? lightDef.range : 0;
+
+ switch ( lightDef.type ) {
+
+ case 'directional':
+ lightNode = new DirectionalLight( color );
+ lightNode.target.position.set( 0, 0, - 1 );
+ lightNode.add( lightNode.target );
+ break;
+
+ case 'point':
+ lightNode = new PointLight( color );
+ lightNode.distance = range;
+ break;
+
+ case 'spot':
+ lightNode = new SpotLight( color );
+ lightNode.distance = range;
+ // Handle spotlight properties.
+ 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 );
+
+ }
+
+ // Some lights (e.g. spot) default to a position other than the origin. Reset the position
+ // here, because node-level parsing will only override position if explicitly specified.
+ lightNode.position.set( 0, 0, 0 );
+
+ lightNode.decay = 2;
+
+ 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 );
+
+ } );
+
+ }
+
+}
+
+/**
+ * Unlit Materials Extension
+ *
+ * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_materials_unlit
+ */
+class GLTFMaterialsUnlitExtension {
+
+ constructor() {
+
+ this.name = EXTENSIONS.KHR_MATERIALS_UNLIT;
+
+ }
+
+ getMaterialType() {
+
+ return MeshBasicMaterial;
+
+ }
+
+ extendParams( materialParams, materialDef, parser ) {
+
+ const pending = [];
+
+ materialParams.color = new 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 ], LinearSRGBColorSpace );
+ materialParams.opacity = array[ 3 ];
+
+ }
+
+ if ( metallicRoughness.baseColorTexture !== undefined ) {
+
+ pending.push( parser.assignTexture( materialParams, 'map', metallicRoughness.baseColorTexture, SRGBColorSpace ) );
+
+ }
+
+ }
+
+ return Promise.all( pending );
+
+ }
+
+}
+
+/**
+ * Materials Emissive Strength Extension
+ *
+ * Specification: https://github.com/KhronosGroup/glTF/blob/5768b3ce0ef32bc39cdf1bef10b948586635ead3/extensions/2.0/Khronos/KHR_materials_emissive_strength/README.md
+ */
+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();
+
+ }
+
+}
+
+/**
+ * Clearcoat Materials Extension
+ *
+ * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_materials_clearcoat
+ */
+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 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 Vector2( scale, scale );
+
+ }
+
+ }
+
+ return Promise.all( pending );
+
+ }
+
+}
+
+/**
+ * Iridescence Materials Extension
+ *
+ * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_materials_iridescence
+ */
+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 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 );
+
+ }
+
+}
+
+/**
+ * Sheen Materials Extension
+ *
+ * Specification: https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Khronos/KHR_materials_sheen
+ */
+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 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 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 ], LinearSRGBColorSpace );
+
+ }
+
+ if ( extension.sheenRoughnessFactor !== undefined ) {
+
+ materialParams.sheenRoughness = extension.sheenRoughnessFactor;
+
+ }
+
+ if ( extension.sheenColorTexture !== undefined ) {
+
+ pending.push( parser.assignTexture( materialParams, 'sheenColorMap', extension.sheenColorTexture, SRGBColorSpace ) );
+
+ }
+
+ if ( extension.sheenRoughnessTexture !== undefined ) {
+
+ pending.push( parser.assignTexture( materialParams, 'sheenRoughnessMap', extension.sheenRoughnessTexture ) );
+
+ }
+
+ return Promise.all( pending );
+
+ }
+
+}
+
+/**
+ * Transmission Materials Extension
+ *
+ * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_materials_transmission
+ * Draft: https://github.com/KhronosGroup/glTF/pull/1698
+ */
+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 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 );
+
+ }
+
+}
+
+/**
+ * Materials Volume Extension
+ *
+ * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_materials_volume
+ */
+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 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 Color().setRGB( colorArray[ 0 ], colorArray[ 1 ], colorArray[ 2 ], LinearSRGBColorSpace );
+
+ return Promise.all( pending );
+
+ }
+
+}
+
+/**
+ * Materials ior Extension
+ *
+ * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_materials_ior
+ */
+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 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();
+
+ }
+
+}
+
+/**
+ * Materials specular Extension
+ *
+ * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_materials_specular
+ */
+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 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 Color().setRGB( colorArray[ 0 ], colorArray[ 1 ], colorArray[ 2 ], LinearSRGBColorSpace );
+
+ if ( extension.specularColorTexture !== undefined ) {
+
+ pending.push( parser.assignTexture( materialParams, 'specularColorMap', extension.specularColorTexture, SRGBColorSpace ) );
+
+ }
+
+ return Promise.all( pending );
+
+ }
+
+}
+
+
+/**
+ * Materials bump Extension
+ *
+ * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/EXT_materials_bump
+ */
+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 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 );
+
+ }
+
+}
+
+/**
+ * Materials anisotropy Extension
+ *
+ * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_materials_anisotropy
+ */
+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 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 );
+
+ }
+
+}
+
+/**
+ * BasisU Texture Extension
+ *
+ * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_texture_basisu
+ */
+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 {
+
+ // Assumes that the extension is optional and that a fallback texture is present
+ return null;
+
+ }
+
+ }
+
+ return parser.loadTextureImage( textureIndex, extension.source, loader );
+
+ }
+
+}
+
+/**
+ * WebP Texture Extension
+ *
+ * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Vendor/EXT_texture_webp
+ */
+class GLTFTextureWebPExtension {
+
+ constructor( parser ) {
+
+ this.parser = parser;
+ this.name = EXTENSIONS.EXT_TEXTURE_WEBP;
+ this.isSupported = null;
+
+ }
+
+ 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 this.detectSupport().then( function ( isSupported ) {
+
+ if ( isSupported ) return parser.loadTextureImage( textureIndex, extension.source, loader );
+
+ if ( json.extensionsRequired && json.extensionsRequired.indexOf( name ) >= 0 ) {
+
+ throw new Error( 'THREE.GLTFLoader: WebP required by asset but unsupported.' );
+
+ }
+
+ // Fall back to PNG or JPEG.
+ return parser.loadTexture( textureIndex );
+
+ } );
+
+ }
+
+ detectSupport() {
+
+ if ( ! this.isSupported ) {
+
+ this.isSupported = new Promise( function ( resolve ) {
+
+ const image = new Image();
+
+ // Lossy test image. Support for lossy images doesn't guarantee support for all
+ // WebP images, unfortunately.
+ image.src = 'data:image/webp;base64,UklGRiIAAABXRUJQVlA4IBYAAAAwAQCdASoBAAEADsD+JaQAA3AAAAAA';
+
+ image.onload = image.onerror = function () {
+
+ resolve( image.height === 1 );
+
+ };
+
+ } );
+
+ }
+
+ return this.isSupported;
+
+ }
+
+}
+
+/**
+ * AVIF Texture Extension
+ *
+ * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Vendor/EXT_texture_avif
+ */
+class GLTFTextureAVIFExtension {
+
+ constructor( parser ) {
+
+ this.parser = parser;
+ this.name = EXTENSIONS.EXT_TEXTURE_AVIF;
+ this.isSupported = null;
+
+ }
+
+ 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 this.detectSupport().then( function ( isSupported ) {
+
+ if ( isSupported ) return parser.loadTextureImage( textureIndex, extension.source, loader );
+
+ if ( json.extensionsRequired && json.extensionsRequired.indexOf( name ) >= 0 ) {
+
+ throw new Error( 'THREE.GLTFLoader: AVIF required by asset but unsupported.' );
+
+ }
+
+ // Fall back to PNG or JPEG.
+ return parser.loadTexture( textureIndex );
+
+ } );
+
+ }
+
+ detectSupport() {
+
+ if ( ! this.isSupported ) {
+
+ this.isSupported = new Promise( function ( resolve ) {
+
+ const image = new Image();
+
+ // Lossy test image.
+ image.src = 'data:image/avif;base64,AAAAIGZ0eXBhdmlmAAAAAGF2aWZtaWYxbWlhZk1BMUIAAADybWV0YQAAAAAAAAAoaGRscgAAAAAAAAAAcGljdAAAAAAAAAAAAAAAAGxpYmF2aWYAAAAADnBpdG0AAAAAAAEAAAAeaWxvYwAAAABEAAABAAEAAAABAAABGgAAABcAAAAoaWluZgAAAAAAAQAAABppbmZlAgAAAAABAABhdjAxQ29sb3IAAAAAamlwcnAAAABLaXBjbwAAABRpc3BlAAAAAAAAAAEAAAABAAAAEHBpeGkAAAAAAwgICAAAAAxhdjFDgQAMAAAAABNjb2xybmNseAACAAIABoAAAAAXaXBtYQAAAAAAAAABAAEEAQKDBAAAAB9tZGF0EgAKCBgABogQEDQgMgkQAAAAB8dSLfI=';
+ image.onload = image.onerror = function () {
+
+ resolve( image.height === 1 );
+
+ };
+
+ } );
+
+ }
+
+ return this.isSupported;
+
+ }
+
+}
+
+/**
+ * meshopt BufferView Compression Extension
+ *
+ * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Vendor/EXT_meshopt_compression
+ */
+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 {
+
+ // Assumes that the extension is optional and that fallback buffer data is present
+ 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 {
+
+ // Support for MeshoptDecoder 0.18 or earlier, without decodeGltfBufferAsync
+ 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;
+
+ }
+
+ }
+
+}
+
+/**
+ * GPU Instancing Extension
+ *
+ * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Vendor/EXT_mesh_gpu_instancing
+ *
+ */
+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 ];
+
+ // No Points or Lines + Instancing support yet
+
+ 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;
+
+ // @TODO: Can we support InstancedMesh + SkinnedMesh?
+
+ 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; // All attribute counts should be same
+ const instancedMeshes = [];
+
+ for ( const mesh of meshes ) {
+
+ // Temporal variables
+ const m = new Matrix4();
+ const p = new Vector3();
+ const q = new Quaternion();
+ const s = new Vector3( 1, 1, 1 );
+
+ const instancedMesh = new 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 ) );
+
+ }
+
+ // Add instance attributes to the geometry, excluding TRS.
+ for ( const attributeName in attributes ) {
+
+ if ( attributeName === '_COLOR_0' ) {
+
+ const attr = attributes[ attributeName ];
+ instancedMesh.instanceColor = new InstancedBufferAttribute( attr.array, attr.itemSize, attr.normalized );
+
+ } else if ( attributeName !== 'TRANSLATION' &&
+ attributeName !== 'ROTATION' &&
+ attributeName !== 'SCALE' ) {
+
+ mesh.geometry.setAttribute( attributeName, attributes[ attributeName ] );
+
+ }
+
+ }
+
+ // Just in case
+ 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 ];
+
+ } );
+
+ }
+
+}
+
+/* BINARY EXTENSION */
+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 );
+
+ }
+
+ // Clients must ignore chunks with unknown types.
+
+ chunkIndex += chunkLength;
+
+ }
+
+ if ( this.content === null ) {
+
+ throw new Error( 'THREE.GLTFLoader: JSON content not found.' );
+
+ }
+
+ }
+
+}
+
+/**
+ * DRACO Mesh Compression Extension
+ *
+ * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_draco_mesh_compression
+ */
+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, LinearSRGBColorSpace, reject );
+
+ } );
+
+ } );
+
+ }
+
+}
+
+/**
+ * Texture Transform Extension
+ *
+ * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_texture_transform
+ */
+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 ) {
+
+ // See https://github.com/mrdoob/three.js/issues/21819.
+ 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;
+
+ }
+
+}
+
+/**
+ * Mesh Quantization Extension
+ *
+ * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_mesh_quantization
+ */
+class GLTFMeshQuantizationExtension {
+
+ constructor() {
+
+ this.name = EXTENSIONS.KHR_MESH_QUANTIZATION;
+
+ }
+
+}
+
+/*********************************/
+/********** INTERPOLATION ********/
+/*********************************/
+
+// Spline Interpolation
+// Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#appendix-c-spline-interpolation
+class GLTFCubicSplineInterpolant extends Interpolant {
+
+ constructor( parameterPositions, sampleValues, sampleSize, resultBuffer ) {
+
+ super( parameterPositions, sampleValues, sampleSize, resultBuffer );
+
+ }
+
+ copySampleValue_( index ) {
+
+ // Copies a sample value to the result buffer. See description of glTF
+ // CUBICSPLINE values layout in interpolate_() function below.
+
+ 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;
+
+ // Layout of keyframe output values for CUBICSPLINE animations:
+ // [ inTangent_1, splineVertex_1, outTangent_1, inTangent_2, splineVertex_2, ... ]
+ for ( let i = 0; i !== stride; i ++ ) {
+
+ const p0 = values[ offset0 + i + stride ]; // splineVertex_k
+ const m0 = values[ offset0 + i + stride2 ] * td; // outTangent_k * (t_k+1 - t_k)
+ const p1 = values[ offset1 + i + stride ]; // splineVertex_k+1
+ const m1 = values[ offset1 + i ] * td; // inTangent_k+1 * (t_k+1 - t_k)
+
+ result[ i ] = s0 * p0 + s1 * m0 + s2 * p1 + s3 * m1;
+
+ }
+
+ return result;
+
+ }
+
+}
+
+const _q = new Quaternion();
+
+class GLTFCubicSplineQuaternionInterpolant extends GLTFCubicSplineInterpolant {
+
+ interpolate_( i1, t0, t, t1 ) {
+
+ const result = super.interpolate_( i1, t0, t, t1 );
+
+ _q.fromArray( result ).normalize().toArray( result );
+
+ return result;
+
+ }
+
+}
+
+
+/*********************************/
+/********** INTERNALS ************/
+/*********************************/
+
+/* CONSTANTS */
+
+const WEBGL_CONSTANTS = {
+ FLOAT: 5126,
+ //FLOAT_MAT2: 35674,
+ FLOAT_MAT3: 35675,
+ FLOAT_MAT4: 35676,
+ FLOAT_VEC2: 35664,
+ FLOAT_VEC3: 35665,
+ FLOAT_VEC4: 35666,
+ LINEAR: 9729,
+ REPEAT: 10497,
+ SAMPLER_2D: 35678,
+ POINTS: 0,
+ LINES: 1,
+ LINE_LOOP: 2,
+ LINE_STRIP: 3,
+ TRIANGLES: 4,
+ TRIANGLE_STRIP: 5,
+ TRIANGLE_FAN: 6,
+ UNSIGNED_BYTE: 5121,
+ UNSIGNED_SHORT: 5123
+};
+
+const WEBGL_COMPONENT_TYPES = {
+ 5120: Int8Array,
+ 5121: Uint8Array,
+ 5122: Int16Array,
+ 5123: Uint16Array,
+ 5125: Uint32Array,
+ 5126: Float32Array
+};
+
+const WEBGL_FILTERS = {
+ 9728: NearestFilter,
+ 9729: LinearFilter,
+ 9984: NearestMipmapNearestFilter,
+ 9985: LinearMipmapNearestFilter,
+ 9986: NearestMipmapLinearFilter,
+ 9987: LinearMipmapLinearFilter
+};
+
+const WEBGL_WRAPPINGS = {
+ 33071: ClampToEdgeWrapping,
+ 33648: MirroredRepeatWrapping,
+ 10497: 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, // We use a custom interpolant (GLTFCubicSplineInterpolation) for CUBICSPLINE tracks. Each
+ // keyframe track will be initialized with a default interpolation type, then modified.
+ LINEAR: InterpolateLinear,
+ STEP: InterpolateDiscrete
+};
+
+const ALPHA_MODES = {
+ OPAQUE: 'OPAQUE',
+ MASK: 'MASK',
+ BLEND: 'BLEND'
+};
+
+/**
+ * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#default-material
+ */
+function createDefaultMaterial( cache ) {
+
+ if ( cache[ 'DefaultMaterial' ] === undefined ) {
+
+ cache[ 'DefaultMaterial' ] = new MeshStandardMaterial( {
+ color: 0xFFFFFF,
+ emissive: 0x000000,
+ metalness: 1,
+ roughness: 1,
+ transparent: false,
+ depthTest: true,
+ side: FrontSide
+ } );
+
+ }
+
+ return cache[ 'DefaultMaterial' ];
+
+}
+
+function addUnknownExtensionsToUserData( knownExtensions, object, objectDef ) {
+
+ // Add unknown glTF extensions to an object's userData.
+
+ for ( const name in objectDef.extensions ) {
+
+ if ( knownExtensions[ name ] === undefined ) {
+
+ object.userData.gltfExtensions = object.userData.gltfExtensions || {};
+ object.userData.gltfExtensions[ name ] = objectDef.extensions[ name ];
+
+ }
+
+ }
+
+}
+
+/**
+ * @param {Object3D|Material|BufferGeometry} object
+ * @param {GLTF.definition} gltfDef
+ */
+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 );
+
+ }
+
+ }
+
+}
+
+/**
+ * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#morph-targets
+ *
+ * @param {BufferGeometry} geometry
+ * @param {Array<GLTF.Target>} targets
+ * @param {GLTFParser} parser
+ * @return {Promise<BufferGeometry>}
+ */
+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;
+
+ } );
+
+}
+
+/**
+ * @param {Mesh} mesh
+ * @param {GLTF.Mesh} meshDef
+ */
+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 ];
+
+ }
+
+ }
+
+ // .extras has user-defined data, so check that .extras.targetNames is an array.
+ 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 ) {
+
+ // Reference:
+ // https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_mesh_quantization#encoding-quantized-data
+
+ 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';
+
+ return 'image/png';
+
+}
+
+const _identityMatrix = new Matrix4();
+
+/* GLTF PARSER */
+
+class GLTFParser {
+
+ constructor( json = {}, options = {} ) {
+
+ this.json = json;
+ this.extensions = {};
+ this.plugins = {};
+ this.options = options;
+
+ // loader object cache
+ this.cache = new GLTFRegistry();
+
+ // associations between Three.js objects and glTF elements
+ this.associations = new Map();
+
+ // BufferGeometry caching
+ this.primitiveCache = {};
+
+ // Node cache
+ this.nodeCache = {};
+
+ // Object3D instance caches
+ this.meshCache = { refs: {}, uses: {} };
+ this.cameraCache = { refs: {}, uses: {} };
+ this.lightCache = { refs: {}, uses: {} };
+
+ this.sourceCache = {};
+ this.textureCache = {};
+
+ // Track node names, to ensure no duplicates
+ this.nodeNamesUsed = {};
+
+ // Use an ImageBitmapLoader if imageBitmaps are supported. Moves much of the
+ // expensive work of uploading a texture to the GPU off the main thread.
+
+ let isSafari = false;
+ let isFirefox = false;
+ let firefoxVersion = - 1;
+
+ if ( typeof navigator !== 'undefined' ) {
+
+ isSafari = /^((?!chrome|android).)*safari/i.test( navigator.userAgent ) === true;
+ isFirefox = navigator.userAgent.indexOf( 'Firefox' ) > - 1;
+ firefoxVersion = isFirefox ? navigator.userAgent.match( /Firefox\/([0-9]+)\./ )[ 1 ] : - 1;
+
+ }
+
+ if ( typeof createImageBitmap === 'undefined' || isSafari || ( isFirefox && firefoxVersion < 98 ) ) {
+
+ this.textureLoader = new TextureLoader( this.options.manager );
+
+ } else {
+
+ this.textureLoader = new ImageBitmapLoader( this.options.manager );
+
+ }
+
+ this.textureLoader.setCrossOrigin( this.options.crossOrigin );
+ this.textureLoader.setRequestHeader( this.options.requestHeader );
+
+ this.fileLoader = new 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;
+
+ // Clear the loader cache
+ this.cache.removeAll();
+ this.nodeCache = {};
+
+ // Mark the special nodes/meshes in json for efficient parse
+ 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 () {
+
+ onLoad( result );
+
+ } );
+
+ } ).catch( onError );
+
+ }
+
+ /**
+ * Marks the special nodes/meshes in json for efficient parse.
+ */
+ _markDefs() {
+
+ const nodeDefs = this.json.nodes || [];
+ const skinDefs = this.json.skins || [];
+ const meshDefs = this.json.meshes || [];
+
+ // Nothing in the node definition indicates whether it is a Bone or an
+ // Object3D. Use the skins' joint references to mark bones.
+ 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;
+
+ }
+
+ }
+
+ // Iterate over all nodes, marking references to shared resources,
+ // as well as skeleton joints.
+ for ( let nodeIndex = 0, nodeLength = nodeDefs.length; nodeIndex < nodeLength; nodeIndex ++ ) {
+
+ const nodeDef = nodeDefs[ nodeIndex ];
+
+ if ( nodeDef.mesh !== undefined ) {
+
+ this._addNodeRef( this.meshCache, nodeDef.mesh );
+
+ // Nothing in the mesh definition indicates whether it is
+ // a SkinnedMesh or Mesh. Use the node's mesh reference
+ // to mark SkinnedMesh if node has skin.
+ if ( nodeDef.skin !== undefined ) {
+
+ meshDefs[ nodeDef.mesh ].isSkinnedMesh = true;
+
+ }
+
+ }
+
+ if ( nodeDef.camera !== undefined ) {
+
+ this._addNodeRef( this.cameraCache, nodeDef.camera );
+
+ }
+
+ }
+
+ }
+
+ /**
+ * Counts references to shared node / Object3D resources. These resources
+ * can be reused, or "instantiated", at multiple nodes in the scene
+ * hierarchy. Mesh, Camera, and Light instances are instantiated and must
+ * be marked. Non-scenegraph resources (like Materials, Geometries, and
+ * Textures) can be reused directly and are not marked here.
+ *
+ * Example: CesiumMilkTruck sample model reuses "Wheel" meshes.
+ */
+ _addNodeRef( cache, index ) {
+
+ if ( index === undefined ) return;
+
+ if ( cache.refs[ index ] === undefined ) {
+
+ cache.refs[ index ] = cache.uses[ index ] = 0;
+
+ }
+
+ cache.refs[ index ] ++;
+
+ }
+
+ /** Returns a reference to a shared resource, cloning it if necessary. */
+ _getNodeRef( cache, index, object ) {
+
+ if ( cache.refs[ index ] <= 1 ) return object;
+
+ const ref = object.clone();
+
+ // Propagates mappings to the cloned object, prevents mappings on the
+ // original object from being lost.
+ 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;
+
+ }
+
+ /**
+ * Requests the specified dependency asynchronously, with caching.
+ * @param {string} type
+ * @param {number} index
+ * @return {Promise<Object3D|Material|THREE.Texture|AnimationClip|ArrayBuffer|Object>}
+ */
+ 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;
+
+ }
+
+ /**
+ * Requests all dependencies of the specified type asynchronously, with caching.
+ * @param {string} type
+ * @return {Promise<Array<Object>>}
+ */
+ 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;
+
+ }
+
+ /**
+ * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#buffers-and-buffer-views
+ * @param {number} bufferIndex
+ * @return {Promise<ArrayBuffer>}
+ */
+ 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 present, GLB container is required to be the first buffer.
+ if ( bufferDef.uri === undefined && bufferIndex === 0 ) {
+
+ return Promise.resolve( this.extensions[ EXTENSIONS.KHR_BINARY_GLTF ].body );
+
+ }
+
+ const options = this.options;
+
+ return new Promise( function ( resolve, reject ) {
+
+ loader.load( LoaderUtils.resolveURL( bufferDef.uri, options.path ), resolve, undefined, function () {
+
+ reject( new Error( 'THREE.GLTFLoader: Failed to load buffer "' + bufferDef.uri + '".' ) );
+
+ } );
+
+ } );
+
+ }
+
+ /**
+ * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#buffers-and-buffer-views
+ * @param {number} bufferViewIndex
+ * @return {Promise<ArrayBuffer>}
+ */
+ 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 );
+
+ } );
+
+ }
+
+ /**
+ * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#accessors
+ * @param {number} accessorIndex
+ * @return {Promise<BufferAttribute|InterleavedBufferAttribute>}
+ */
+ 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 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 ];
+
+ // For VEC3: itemSize is 3, elementBytes is 4, itemBytes is 12.
+ 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;
+
+ // The buffer is not interleaved if the stride is the item size in bytes.
+ if ( byteStride && byteStride !== itemBytes ) {
+
+ // Each "slice" of the buffer, as defined by 'count' elements of 'byteStride' bytes, gets its own InterleavedBuffer
+ // This makes sure that IBA.count reflects accessor.count properly
+ 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 );
+
+ // Integer parameters to IB/IBA are in array elements, not bytes.
+ ib = new InterleavedBuffer( array, byteStride / elementBytes );
+
+ parser.cache.add( ibCacheKey, ib );
+
+ }
+
+ bufferAttribute = new 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 BufferAttribute( array, itemSize, normalized );
+
+ }
+
+ // https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#sparse-accessors
+ 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 ) {
+
+ // Avoid modifying the original ArrayBuffer, if the bufferView wasn't initialized with zeroes.
+ bufferAttribute = new BufferAttribute( bufferAttribute.array.slice(), bufferAttribute.itemSize, bufferAttribute.normalized );
+
+ }
+
+ 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.' );
+
+ }
+
+ }
+
+ return bufferAttribute;
+
+ } );
+
+ }
+
+ /**
+ * Specification: https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#textures
+ * @param {number} textureIndex
+ * @return {Promise<THREE.Texture|null>}
+ */
+ 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 ] ) {
+
+ // See https://github.com/mrdoob/three.js/issues/21559.
+ 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 ] || LinearFilter;
+ texture.minFilter = WEBGL_FILTERS[ sampler.minFilter ] || LinearMipmapLinearFilter;
+ texture.wrapS = WEBGL_WRAPPINGS[ sampler.wrapS ] || RepeatWrapping;
+ texture.wrapT = WEBGL_WRAPPINGS[ sampler.wrapT ] || RepeatWrapping;
+
+ 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 ) {
+
+ // Load binary image data from bufferView, if provided.
+
+ 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 Texture( imageBitmap );
+ texture.needsUpdate = true;
+
+ resolve( texture );
+
+ };
+
+ }
+
+ loader.load( LoaderUtils.resolveURL( sourceURI, options.path ), onLoad, undefined, reject );
+
+ } );
+
+ } ).then( function ( texture ) {
+
+ // Clean up resources and configure Texture.
+
+ if ( isObjectURL === true ) {
+
+ URL.revokeObjectURL( sourceURI );
+
+ }
+
+ 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;
+
+ }
+
+ /**
+ * Asynchronously assigns a texture to the given material parameters.
+ * @param {Object} materialParams
+ * @param {string} mapName
+ * @param {Object} mapDef
+ * @return {Promise<Texture>}
+ */
+ 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;
+
+ } );
+
+ }
+
+ /**
+ * Assigns final material to a Mesh, Line, or Points instance. The instance
+ * already has a material (generated from the glTF material options alone)
+ * but reuse of the same glTF material may require multiple threejs materials
+ * to accommodate different primitive types, defines, etc. New materials will
+ * be created if necessary, and reused from a cache.
+ * @param {Object3D} mesh Mesh, Line, or Points instance.
+ */
+ 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 PointsMaterial();
+ Material.prototype.copy.call( pointsMaterial, material );
+ pointsMaterial.color.copy( material.color );
+ pointsMaterial.map = material.map;
+ pointsMaterial.sizeAttenuation = false; // glTF spec says points should be 1px
+
+ 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 LineBasicMaterial();
+ Material.prototype.copy.call( lineMaterial, material );
+ lineMaterial.color.copy( material.color );
+ lineMaterial.map = material.map;
+
+ this.cache.add( cacheKey, lineMaterial );
+
+ }
+
+ material = lineMaterial;
+
+ }
+
+ // Clone the material if it will be modified
+ 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 ) {
+
+ // https://github.com/mrdoob/three.js/issues/11438#issuecomment-507003995
+ 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( /* materialIndex */ ) {
+
+ return MeshStandardMaterial;
+
+ }
+
+ /**
+ * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#materials
+ * @param {number} materialIndex
+ * @return {Promise<Material>}
+ */
+ 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 {
+
+ // Specification:
+ // https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#metallic-roughness-material
+
+ const metallicRoughness = materialDef.pbrMetallicRoughness || {};
+
+ materialParams.color = new 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 ], LinearSRGBColorSpace );
+ materialParams.opacity = array[ 3 ];
+
+ }
+
+ if ( metallicRoughness.baseColorTexture !== undefined ) {
+
+ pending.push( parser.assignTexture( materialParams, 'map', metallicRoughness.baseColorTexture, 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 = DoubleSide;
+
+ }
+
+ const alphaMode = materialDef.alphaMode || ALPHA_MODES.OPAQUE;
+
+ if ( alphaMode === ALPHA_MODES.BLEND ) {
+
+ materialParams.transparent = true;
+
+ // See: https://github.com/mrdoob/three.js/issues/17706
+ 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 !== MeshBasicMaterial ) {
+
+ pending.push( parser.assignTexture( materialParams, 'normalMap', materialDef.normalTexture ) );
+
+ materialParams.normalScale = new Vector2( 1, 1 );
+
+ if ( materialDef.normalTexture.scale !== undefined ) {
+
+ const scale = materialDef.normalTexture.scale;
+
+ materialParams.normalScale.set( scale, scale );
+
+ }
+
+ }
+
+ if ( materialDef.occlusionTexture !== undefined && materialType !== MeshBasicMaterial ) {
+
+ pending.push( parser.assignTexture( materialParams, 'aoMap', materialDef.occlusionTexture ) );
+
+ if ( materialDef.occlusionTexture.strength !== undefined ) {
+
+ materialParams.aoMapIntensity = materialDef.occlusionTexture.strength;
+
+ }
+
+ }
+
+ if ( materialDef.emissiveFactor !== undefined && materialType !== MeshBasicMaterial ) {
+
+ const emissiveFactor = materialDef.emissiveFactor;
+ materialParams.emissive = new Color().setRGB( emissiveFactor[ 0 ], emissiveFactor[ 1 ], emissiveFactor[ 2 ], LinearSRGBColorSpace );
+
+ }
+
+ if ( materialDef.emissiveTexture !== undefined && materialType !== MeshBasicMaterial ) {
+
+ pending.push( parser.assignTexture( materialParams, 'emissiveMap', materialDef.emissiveTexture, 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;
+
+ } );
+
+ }
+
+ /** When Object3D instances are targeted by animation, they need unique names. */
+ createUniqueName( originalName ) {
+
+ const sanitizedName = PropertyBinding.sanitizeNodeName( originalName || '' );
+
+ if ( sanitizedName in this.nodeNamesUsed ) {
+
+ return sanitizedName + '_' + ( ++ this.nodeNamesUsed[ sanitizedName ] );
+
+ } else {
+
+ this.nodeNamesUsed[ sanitizedName ] = 0;
+
+ return sanitizedName;
+
+ }
+
+ }
+
+ /**
+ * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#geometry
+ *
+ * Creates BufferGeometries from primitives.
+ *
+ * @param {Array<GLTF.Primitive>} primitives
+ * @return {Promise<Array<BufferGeometry>>}
+ */
+ 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 );
+
+ // See if we've already created this geometry
+ const cached = cache[ cacheKey ];
+
+ if ( cached ) {
+
+ // Use the cached geometry if it exists
+ pending.push( cached.promise );
+
+ } else {
+
+ let geometryPromise;
+
+ if ( primitive.extensions && primitive.extensions[ EXTENSIONS.KHR_DRACO_MESH_COMPRESSION ] ) {
+
+ // Use DRACO geometry if available
+ geometryPromise = createDracoPrimitive( primitive );
+
+ } else {
+
+ // Otherwise create a new geometry
+ geometryPromise = addPrimitiveAttributes( new BufferGeometry(), primitive, parser );
+
+ }
+
+ // Cache this geometry
+ cache[ cacheKey ] = { primitive: primitive, promise: geometryPromise };
+
+ pending.push( geometryPromise );
+
+ }
+
+ }
+
+ return Promise.all( pending );
+
+ }
+
+ /**
+ * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#meshes
+ * @param {number} meshIndex
+ * @return {Promise<Group|Mesh|SkinnedMesh>}
+ */
+ 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 ];
+
+ // 1. create Mesh
+
+ 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 ) {
+
+ // .isSkinnedMesh isn't in glTF spec. See ._markDefs()
+ mesh = meshDef.isSkinnedMesh === true
+ ? new SkinnedMesh( geometry, material )
+ : new Mesh( geometry, material );
+
+ if ( mesh.isSkinnedMesh === true ) {
+
+ // normalize skin weights to fix malformed assets (see #15319)
+ mesh.normalizeSkinWeights();
+
+ }
+
+ if ( primitive.mode === WEBGL_CONSTANTS.TRIANGLE_STRIP ) {
+
+ mesh.geometry = toTrianglesDrawMode( mesh.geometry, TriangleStripDrawMode );
+
+ } else if ( primitive.mode === WEBGL_CONSTANTS.TRIANGLE_FAN ) {
+
+ mesh.geometry = toTrianglesDrawMode( mesh.geometry, TriangleFanDrawMode );
+
+ }
+
+ } else if ( primitive.mode === WEBGL_CONSTANTS.LINES ) {
+
+ mesh = new LineSegments( geometry, material );
+
+ } else if ( primitive.mode === WEBGL_CONSTANTS.LINE_STRIP ) {
+
+ mesh = new Line( geometry, material );
+
+ } else if ( primitive.mode === WEBGL_CONSTANTS.LINE_LOOP ) {
+
+ mesh = new LineLoop( geometry, material );
+
+ } else if ( primitive.mode === WEBGL_CONSTANTS.POINTS ) {
+
+ mesh = new 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 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;
+
+ } );
+
+ }
+
+ /**
+ * Specification: https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#cameras
+ * @param {number} cameraIndex
+ * @return {Promise<THREE.Camera>}
+ */
+ 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 PerspectiveCamera( MathUtils.radToDeg( params.yfov ), params.aspectRatio || 1, params.znear || 1, params.zfar || 2e6 );
+
+ } else if ( cameraDef.type === 'orthographic' ) {
+
+ camera = new 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 );
+
+ }
+
+ /**
+ * Specification: https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#skins
+ * @param {number} skinIndex
+ * @return {Promise<Skeleton>}
+ */
+ 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;
+
+ // Note that bones (joint nodes) may or may not be in the
+ // scene graph at this time.
+
+ 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 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 Skeleton( bones, boneInverses );
+
+ } );
+
+ }
+
+ /**
+ * Specification: https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#animations
+ * @param {number} animationIndex
+ * @return {Promise<AnimationClip>}
+ */
+ 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 ] );
+
+ }
+
+ }
+
+ }
+
+ return new AnimationClip( animationName, undefined, tracks );
+
+ } );
+
+ }
+
+ 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 weights are provided on the node, override weights on the 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;
+
+ } );
+
+ }
+
+ /**
+ * Specification: https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#nodes-and-hierarchy
+ * @param {number} nodeIndex
+ * @return {Promise<Object3D>}
+ */
+ 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 ) {
+
+ // This full traverse should be fine because
+ // child glTF nodes have not been added to this node yet.
+ 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() parses a single node.
+ // skin and child nodes are created and added in .loadNode() (no '_' prefix).
+ _loadNodeShallow( nodeIndex ) {
+
+ const json = this.json;
+ const extensions = this.extensions;
+ const parser = this;
+
+ // This method is called from .loadNode() and .loadSkin().
+ // Cache a node to avoid duplication.
+
+ if ( this.nodeCache[ nodeIndex ] !== undefined ) {
+
+ return this.nodeCache[ nodeIndex ];
+
+ }
+
+ const nodeDef = json.nodes[ nodeIndex ];
+
+ // reserve node's name before its dependencies, so the root has the intended name.
+ 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;
+
+ // .isBone isn't in glTF spec. See ._markDefs
+ if ( nodeDef.isBone === true ) {
+
+ node = new Bone();
+
+ } else if ( objects.length > 1 ) {
+
+ node = new Group();
+
+ } else if ( objects.length === 1 ) {
+
+ node = objects[ 0 ];
+
+ } else {
+
+ node = new 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 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, {} );
+
+ }
+
+ parser.associations.get( node ).nodes = nodeIndex;
+
+ return node;
+
+ } );
+
+ return this.nodeCache[ nodeIndex ];
+
+ }
+
+ /**
+ * Specification: https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#scenes
+ * @param {number} sceneIndex
+ * @return {Promise<Group>}
+ */
+ loadScene( sceneIndex ) {
+
+ const extensions = this.extensions;
+ const sceneDef = this.json.scenes[ sceneIndex ];
+ const parser = this;
+
+ // Loader returns Group, not Scene.
+ // See: https://github.com/mrdoob/three.js/issues/18342#issuecomment-578981172
+ const scene = new 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 ] );
+
+ }
+
+ // Removes dangling associations, associations that reference a node that
+ // didn't make it into the scene.
+ const reduceAssociations = ( node ) => {
+
+ const reducedAssociations = new Map();
+
+ for ( const [ key, value ] of parser.associations ) {
+
+ if ( key instanceof Material || key instanceof 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 = NumberKeyframeTrack;
+ break;
+
+ case PATH_PROPERTIES.rotation:
+
+ TypedKeyframeTrack = QuaternionKeyframeTrack;
+ break;
+
+ case PATH_PROPERTIES.position:
+ case PATH_PROPERTIES.scale:
+
+ TypedKeyframeTrack = VectorKeyframeTrack;
+ break;
+
+ default:
+
+ switch ( outputAccessor.itemSize ) {
+
+ case 1:
+ TypedKeyframeTrack = NumberKeyframeTrack;
+ break;
+ case 2:
+ case 3:
+ default:
+ TypedKeyframeTrack = VectorKeyframeTrack;
+ break;
+
+ }
+
+ break;
+
+ }
+
+ const interpolation = sampler.interpolation !== undefined ? INTERPOLATION[ sampler.interpolation ] : 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
+ );
+
+ // Override interpolation with custom factory method.
+ 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 ) {
+
+ // A CUBICSPLINE keyframe in glTF has three output values for each input value,
+ // representing inTangent, splineVertex, and outTangent. As a result, track.getValueSize()
+ // must be divided by three to get the interpolant's sampleSize argument.
+
+ const interpolantType = ( this instanceof QuaternionKeyframeTrack ) ? GLTFCubicSplineQuaternionInterpolant : GLTFCubicSplineInterpolant;
+
+ return new interpolantType( this.times, this.values, this.getValueSize() / 3, result );
+
+ };
+
+ // Mark as CUBICSPLINE. `track.getInterpolation()` doesn't support custom interpolants.
+ track.createInterpolant.isInterpolantFactoryMethodGLTFCubicSpline = true;
+
+ }
+
+}
+
+/**
+ * @param {BufferGeometry} geometry
+ * @param {GLTF.Primitive} primitiveDef
+ * @param {GLTFParser} parser
+ */
+function computeBounds( geometry, primitiveDef, parser ) {
+
+ const attributes = primitiveDef.attributes;
+
+ const box = new Box3();
+
+ if ( attributes.POSITION !== undefined ) {
+
+ const accessor = parser.json.accessors[ attributes.POSITION ];
+
+ const min = accessor.min;
+ const max = accessor.max;
+
+ // glTF requires 'min' and 'max', but VRM (which extends glTF) currently ignores that requirement.
+
+ if ( min !== undefined && max !== undefined ) {
+
+ box.set(
+ new Vector3( min[ 0 ], min[ 1 ], min[ 2 ] ),
+ new 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 Vector3();
+ const vector = new 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;
+
+ // glTF requires 'min' and 'max', but VRM (which extends glTF) currently ignores that requirement.
+
+ if ( min !== undefined && max !== undefined ) {
+
+ // we need to get max of absolute components because target weight is [-1,1]
+ 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 );
+
+ }
+
+ // Note: this assumes that the sum of all weights is at most 1. This isn't quite correct - it's more conservative
+ // to assume that each target can have a max weight of 1. However, for some use cases - notably, when morph targets
+ // are used to implement key-frame animations and as such only two are active at a time - this results in very large
+ // boxes. So for now we make a box that's sometimes a touch too small but is hopefully mostly of reasonable size.
+ maxDisplacement.max( vector );
+
+ } else {
+
+ console.warn( 'THREE.GLTFLoader: Missing min/max properties for accessor POSITION.' );
+
+ }
+
+ }
+
+ }
+
+ // As per comment above this box isn't conservative, but has a reasonable size for a very large number of morph targets.
+ box.expandByVector( maxDisplacement );
+
+ }
+
+ geometry.boundingBox = box;
+
+ const sphere = new Sphere();
+
+ box.getCenter( sphere.center );
+ sphere.radius = box.min.distanceTo( box.max ) / 2;
+
+ geometry.boundingSphere = sphere;
+
+}
+
+/**
+ * @param {BufferGeometry} geometry
+ * @param {GLTF.Primitive} primitiveDef
+ * @param {GLTFParser} parser
+ * @return {Promise<BufferGeometry>}
+ */
+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();
+
+ // Skip attributes already provided by e.g. Draco extension.
+ 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 ( ColorManagement.workingColorSpace !== LinearSRGBColorSpace && 'COLOR_0' in attributes ) {
+
+ console.warn( `THREE.GLTFLoader: Converting vertex colors from "srgb-linear" to "${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;
+
+ } );
+
+}
+
+export { GLTFLoader };