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public/sdk/three/jsm/loaders/MTLLoader.js

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+import {
+	Color,
+	DefaultLoadingManager,
+	FileLoader,
+	FrontSide,
+	Loader,
+	LoaderUtils,
+	MeshPhongMaterial,
+	RepeatWrapping,
+	TextureLoader,
+	Vector2,
+	SRGBColorSpace
+} from 'three';
+
+/**
+ * Loads a Wavefront .mtl file specifying materials
+ */
+
+class MTLLoader extends Loader {
+
+	constructor( manager ) {
+
+		super( manager );
+
+	}
+
+	/**
+	 * Loads and parses a MTL asset from a URL.
+	 *
+	 * @param {String} url - URL to the MTL file.
+	 * @param {Function} [onLoad] - Callback invoked with the loaded object.
+	 * @param {Function} [onProgress] - Callback for download progress.
+	 * @param {Function} [onError] - Callback for download errors.
+	 *
+	 * @see setPath setResourcePath
+	 *
+	 * @note In order for relative texture references to resolve correctly
+	 * you must call setResourcePath() explicitly prior to load.
+	 */
+	load( url, onLoad, onProgress, onError ) {
+
+		const scope = this;
+
+		const path = ( this.path === '' ) ? LoaderUtils.extractUrlBase( url ) : this.path;
+
+		const loader = new FileLoader( this.manager );
+		loader.setPath( this.path );
+		loader.setRequestHeader( this.requestHeader );
+		loader.setWithCredentials( this.withCredentials );
+		loader.load( url, function ( text ) {
+
+			try {
+
+				onLoad( scope.parse( text, path ) );
+
+			} catch ( e ) {
+
+				if ( onError ) {
+
+					onError( e );
+
+				} else {
+
+					console.error( e );
+
+				}
+
+				scope.manager.itemError( url );
+
+			}
+
+		}, onProgress, onError );
+
+	}
+
+	setMaterialOptions( value ) {
+
+		this.materialOptions = value;
+		return this;
+
+	}
+
+	/**
+	 * Parses a MTL file.
+	 *
+	 * @param {String} text - Content of MTL file
+	 * @return {MaterialCreator}
+	 *
+	 * @see setPath setResourcePath
+	 *
+	 * @note In order for relative texture references to resolve correctly
+	 * you must call setResourcePath() explicitly prior to parse.
+	 */
+	parse( text, path ) {
+
+		const lines = text.split( '\n' );
+		let info = {};
+		const delimiter_pattern = /\s+/;
+		const materialsInfo = {};
+
+		for ( let i = 0; i < lines.length; i ++ ) {
+
+			let line = lines[ i ];
+			line = line.trim();
+
+			if ( line.length === 0 || line.charAt( 0 ) === '#' ) {
+
+				// Blank line or comment ignore
+				continue;
+
+			}
+
+			const pos = line.indexOf( ' ' );
+
+			let key = ( pos >= 0 ) ? line.substring( 0, pos ) : line;
+			key = key.toLowerCase();
+
+			let value = ( pos >= 0 ) ? line.substring( pos + 1 ) : '';
+			value = value.trim();
+
+			if ( key === 'newmtl' ) {
+
+				// New material
+
+				info = { name: value };
+				materialsInfo[ value ] = info;
+
+			} else {
+
+				if ( key === 'ka' || key === 'kd' || key === 'ks' || key === 'ke' ) {
+
+					const ss = value.split( delimiter_pattern, 3 );
+					info[ key ] = [ parseFloat( ss[ 0 ] ), parseFloat( ss[ 1 ] ), parseFloat( ss[ 2 ] ) ];
+
+				} else {
+
+					info[ key ] = value;
+
+				}
+
+			}
+
+		}
+
+		const materialCreator = new MaterialCreator( this.resourcePath || path, this.materialOptions );
+		materialCreator.setCrossOrigin( this.crossOrigin );
+		materialCreator.setManager( this.manager );
+		materialCreator.setMaterials( materialsInfo );
+		return materialCreator;
+
+	}
+
+}
+
+/**
+ * Create a new MTLLoader.MaterialCreator
+ * @param baseUrl - Url relative to which textures are loaded
+ * @param options - Set of options on how to construct the materials
+ *                  side: Which side to apply the material
+ *                        FrontSide (default), THREE.BackSide, THREE.DoubleSide
+ *                  wrap: What type of wrapping to apply for textures
+ *                        RepeatWrapping (default), THREE.ClampToEdgeWrapping, THREE.MirroredRepeatWrapping
+ *                  normalizeRGB: RGBs need to be normalized to 0-1 from 0-255
+ *                                Default: false, assumed to be already normalized
+ *                  ignoreZeroRGBs: Ignore values of RGBs (Ka,Kd,Ks) that are all 0's
+ *                                  Default: false
+ * @constructor
+ */
+
+class MaterialCreator {
+
+	constructor( baseUrl = '', options = {} ) {
+
+		this.baseUrl = baseUrl;
+		this.options = options;
+		this.materialsInfo = {};
+		this.materials = {};
+		this.materialsArray = [];
+		this.nameLookup = {};
+
+		this.crossOrigin = 'anonymous';
+
+		this.side = ( this.options.side !== undefined ) ? this.options.side : FrontSide;
+		this.wrap = ( this.options.wrap !== undefined ) ? this.options.wrap : RepeatWrapping;
+
+	}
+
+	setCrossOrigin( value ) {
+
+		this.crossOrigin = value;
+		return this;
+
+	}
+
+	setManager( value ) {
+
+		this.manager = value;
+
+	}
+
+	setMaterials( materialsInfo ) {
+
+		this.materialsInfo = this.convert( materialsInfo );
+		this.materials = {};
+		this.materialsArray = [];
+		this.nameLookup = {};
+
+	}
+
+	convert( materialsInfo ) {
+
+		if ( ! this.options ) return materialsInfo;
+
+		const converted = {};
+
+		for ( const mn in materialsInfo ) {
+
+			// Convert materials info into normalized form based on options
+
+			const mat = materialsInfo[ mn ];
+
+			const covmat = {};
+
+			converted[ mn ] = covmat;
+
+			for ( const prop in mat ) {
+
+				let save = true;
+				let value = mat[ prop ];
+				const lprop = prop.toLowerCase();
+
+				switch ( lprop ) {
+
+					case 'kd':
+					case 'ka':
+					case 'ks':
+
+						// Diffuse color (color under white light) using RGB values
+
+						if ( this.options && this.options.normalizeRGB ) {
+
+							value = [ value[ 0 ] / 255, value[ 1 ] / 255, value[ 2 ] / 255 ];
+
+						}
+
+						if ( this.options && this.options.ignoreZeroRGBs ) {
+
+							if ( value[ 0 ] === 0 && value[ 1 ] === 0 && value[ 2 ] === 0 ) {
+
+								// ignore
+
+								save = false;
+
+							}
+
+						}
+
+						break;
+
+					default:
+
+						break;
+
+				}
+
+				if ( save ) {
+
+					covmat[ lprop ] = value;
+
+				}
+
+			}
+
+		}
+
+		return converted;
+
+	}
+
+	preload() {
+
+		for ( const mn in this.materialsInfo ) {
+
+			this.create( mn );
+
+		}
+
+	}
+
+	getIndex( materialName ) {
+
+		return this.nameLookup[ materialName ];
+
+	}
+
+	getAsArray() {
+
+		let index = 0;
+
+		for ( const mn in this.materialsInfo ) {
+
+			this.materialsArray[ index ] = this.create( mn );
+			this.nameLookup[ mn ] = index;
+			index ++;
+
+		}
+
+		return this.materialsArray;
+
+	}
+
+	create( materialName ) {
+
+		if ( this.materials[ materialName ] === undefined ) {
+
+			this.createMaterial_( materialName );
+
+		}
+
+		return this.materials[ materialName ];
+
+	}
+
+	createMaterial_( materialName ) {
+
+		// Create material
+
+		const scope = this;
+		const mat = this.materialsInfo[ materialName ];
+		const params = {
+
+			name: materialName,
+			side: this.side
+
+		};
+
+		function resolveURL( baseUrl, url ) {
+
+			if ( typeof url !== 'string' || url === '' )
+				return '';
+
+			// Absolute URL
+			if ( /^https?:\/\//i.test( url ) ) return url;
+
+			return baseUrl + url;
+
+		}
+
+		function setMapForType( mapType, value ) {
+
+			if ( params[ mapType ] ) return; // Keep the first encountered texture
+
+			const texParams = scope.getTextureParams( value, params );
+			const map = scope.loadTexture( resolveURL( scope.baseUrl, texParams.url ) );
+
+			map.repeat.copy( texParams.scale );
+			map.offset.copy( texParams.offset );
+
+			map.wrapS = scope.wrap;
+			map.wrapT = scope.wrap;
+
+			if ( mapType === 'map' || mapType === 'emissiveMap' ) {
+
+				map.colorSpace = SRGBColorSpace;
+
+			}
+
+			params[ mapType ] = map;
+
+		}
+
+		for ( const prop in mat ) {
+
+			const value = mat[ prop ];
+			let n;
+
+			if ( value === '' ) continue;
+
+			switch ( prop.toLowerCase() ) {
+
+				// Ns is material specular exponent
+
+				case 'kd':
+
+					// Diffuse color (color under white light) using RGB values
+
+					params.color = new Color().fromArray( value ).convertSRGBToLinear();
+
+					break;
+
+				case 'ks':
+
+					// Specular color (color when light is reflected from shiny surface) using RGB values
+					params.specular = new Color().fromArray( value ).convertSRGBToLinear();
+
+					break;
+
+				case 'ke':
+
+					// Emissive using RGB values
+					params.emissive = new Color().fromArray( value ).convertSRGBToLinear();
+
+					break;
+
+				case 'map_kd':
+
+					// Diffuse texture map
+
+					setMapForType( 'map', value );
+
+					break;
+
+				case 'map_ks':
+
+					// Specular map
+
+					setMapForType( 'specularMap', value );
+
+					break;
+
+				case 'map_ke':
+
+					// Emissive map
+
+					setMapForType( 'emissiveMap', value );
+
+					break;
+
+				case 'norm':
+
+					setMapForType( 'normalMap', value );
+
+					break;
+
+				case 'map_bump':
+				case 'bump':
+
+					// Bump texture map
+
+					setMapForType( 'bumpMap', value );
+
+					break;
+
+				case 'map_d':
+
+					// Alpha map
+
+					setMapForType( 'alphaMap', value );
+					params.transparent = true;
+
+					break;
+
+				case 'ns':
+
+					// The specular exponent (defines the focus of the specular highlight)
+					// A high exponent results in a tight, concentrated highlight. Ns values normally range from 0 to 1000.
+
+					params.shininess = parseFloat( value );
+
+					break;
+
+				case 'd':
+					n = parseFloat( value );
+
+					if ( n < 1 ) {
+
+						params.opacity = n;
+						params.transparent = true;
+
+					}
+
+					break;
+
+				case 'tr':
+					n = parseFloat( value );
+
+					if ( this.options && this.options.invertTrProperty ) n = 1 - n;
+
+					if ( n > 0 ) {
+
+						params.opacity = 1 - n;
+						params.transparent = true;
+
+					}
+
+					break;
+
+				default:
+					break;
+
+			}
+
+		}
+
+		this.materials[ materialName ] = new MeshPhongMaterial( params );
+		return this.materials[ materialName ];
+
+	}
+
+	getTextureParams( value, matParams ) {
+
+		const texParams = {
+
+			scale: new Vector2( 1, 1 ),
+			offset: new Vector2( 0, 0 )
+
+		 };
+
+		const items = value.split( /\s+/ );
+		let pos;
+
+		pos = items.indexOf( '-bm' );
+
+		if ( pos >= 0 ) {
+
+			matParams.bumpScale = parseFloat( items[ pos + 1 ] );
+			items.splice( pos, 2 );
+
+		}
+
+		pos = items.indexOf( '-s' );
+
+		if ( pos >= 0 ) {
+
+			texParams.scale.set( parseFloat( items[ pos + 1 ] ), parseFloat( items[ pos + 2 ] ) );
+			items.splice( pos, 4 ); // we expect 3 parameters here!
+
+		}
+
+		pos = items.indexOf( '-o' );
+
+		if ( pos >= 0 ) {
+
+			texParams.offset.set( parseFloat( items[ pos + 1 ] ), parseFloat( items[ pos + 2 ] ) );
+			items.splice( pos, 4 ); // we expect 3 parameters here!
+
+		}
+
+		texParams.url = items.join( ' ' ).trim();
+		return texParams;
+
+	}
+
+	loadTexture( url, mapping, onLoad, onProgress, onError ) {
+
+		const manager = ( this.manager !== undefined ) ? this.manager : DefaultLoadingManager;
+		let loader = manager.getHandler( url );
+
+		if ( loader === null ) {
+
+			loader = new TextureLoader( manager );
+
+		}
+
+		if ( loader.setCrossOrigin ) loader.setCrossOrigin( this.crossOrigin );
+
+		const texture = loader.load( url, onLoad, onProgress, onError );
+
+		if ( mapping !== undefined ) texture.mapping = mapping;
+
+		return texture;
+
+	}
+
+}
+
+export { MTLLoader };