mirror of
https://github.com/jiawanlong/Cesium-Examples.git
synced 2025-11-03 16:54:16 +00:00
495 lines
10 KiB
JavaScript
495 lines
10 KiB
JavaScript
( function () {
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/**
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* Loads a Wavefront .mtl file specifying materials
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*/
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class MTLLoader extends THREE.Loader {
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constructor( manager ) {
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super( manager );
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}
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/**
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* Loads and parses a MTL asset from a URL.
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*
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* @param {String} url - URL to the MTL file.
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* @param {Function} [onLoad] - Callback invoked with the loaded object.
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* @param {Function} [onProgress] - Callback for download progress.
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* @param {Function} [onError] - Callback for download errors.
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*
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* @see setPath setResourcePath
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*
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* @note In order for relative texture references to resolve correctly
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* you must call setResourcePath() explicitly prior to load.
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*/
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load( url, onLoad, onProgress, onError ) {
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const scope = this;
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const path = this.path === '' ? THREE.LoaderUtils.extractUrlBase( url ) : this.path;
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const loader = new THREE.FileLoader( this.manager );
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loader.setPath( this.path );
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loader.setRequestHeader( this.requestHeader );
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loader.setWithCredentials( this.withCredentials );
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loader.load( url, function ( text ) {
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try {
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onLoad( scope.parse( text, path ) );
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} catch ( e ) {
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if ( onError ) {
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onError( e );
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} else {
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console.error( e );
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}
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scope.manager.itemError( url );
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}
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}, onProgress, onError );
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}
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setMaterialOptions( value ) {
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this.materialOptions = value;
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return this;
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}
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/**
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* Parses a MTL file.
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*
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* @param {String} text - Content of MTL file
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* @return {MaterialCreator}
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*
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* @see setPath setResourcePath
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*
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* @note In order for relative texture references to resolve correctly
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* you must call setResourcePath() explicitly prior to parse.
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*/
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parse( text, path ) {
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const lines = text.split( '\n' );
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let info = {};
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const delimiter_pattern = /\s+/;
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const materialsInfo = {};
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for ( let i = 0; i < lines.length; i ++ ) {
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let line = lines[ i ];
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line = line.trim();
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if ( line.length === 0 || line.charAt( 0 ) === '#' ) {
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// Blank line or comment ignore
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continue;
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}
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const pos = line.indexOf( ' ' );
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let key = pos >= 0 ? line.substring( 0, pos ) : line;
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key = key.toLowerCase();
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let value = pos >= 0 ? line.substring( pos + 1 ) : '';
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value = value.trim();
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if ( key === 'newmtl' ) {
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// New material
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info = {
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name: value
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};
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materialsInfo[ value ] = info;
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} else {
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if ( key === 'ka' || key === 'kd' || key === 'ks' || key === 'ke' ) {
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const ss = value.split( delimiter_pattern, 3 );
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info[ key ] = [ parseFloat( ss[ 0 ] ), parseFloat( ss[ 1 ] ), parseFloat( ss[ 2 ] ) ];
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} else {
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info[ key ] = value;
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}
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}
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}
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const materialCreator = new MaterialCreator( this.resourcePath || path, this.materialOptions );
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materialCreator.setCrossOrigin( this.crossOrigin );
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materialCreator.setManager( this.manager );
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materialCreator.setMaterials( materialsInfo );
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return materialCreator;
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}
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}
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/**
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* Create a new MTLLoader.MaterialCreator
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* @param baseUrl - Url relative to which textures are loaded
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* @param options - Set of options on how to construct the materials
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* side: Which side to apply the material
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* THREE.FrontSide (default), THREE.BackSide, THREE.DoubleSide
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* wrap: What type of wrapping to apply for textures
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* THREE.RepeatWrapping (default), THREE.ClampToEdgeWrapping, THREE.MirroredRepeatWrapping
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* normalizeRGB: RGBs need to be normalized to 0-1 from 0-255
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* Default: false, assumed to be already normalized
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* ignoreZeroRGBs: Ignore values of RGBs (Ka,Kd,Ks) that are all 0's
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* Default: false
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* @constructor
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*/
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class MaterialCreator {
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constructor( baseUrl = '', options = {} ) {
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this.baseUrl = baseUrl;
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this.options = options;
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this.materialsInfo = {};
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this.materials = {};
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this.materialsArray = [];
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this.nameLookup = {};
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this.crossOrigin = 'anonymous';
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this.side = this.options.side !== undefined ? this.options.side : THREE.FrontSide;
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this.wrap = this.options.wrap !== undefined ? this.options.wrap : THREE.RepeatWrapping;
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}
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setCrossOrigin( value ) {
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this.crossOrigin = value;
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return this;
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}
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setManager( value ) {
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this.manager = value;
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}
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setMaterials( materialsInfo ) {
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this.materialsInfo = this.convert( materialsInfo );
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this.materials = {};
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this.materialsArray = [];
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this.nameLookup = {};
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}
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convert( materialsInfo ) {
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if ( ! this.options ) return materialsInfo;
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const converted = {};
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for ( const mn in materialsInfo ) {
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// Convert materials info into normalized form based on options
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const mat = materialsInfo[ mn ];
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const covmat = {};
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converted[ mn ] = covmat;
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for ( const prop in mat ) {
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let save = true;
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let value = mat[ prop ];
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const lprop = prop.toLowerCase();
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switch ( lprop ) {
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case 'kd':
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case 'ka':
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case 'ks':
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// Diffuse color (color under white light) using RGB values
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if ( this.options && this.options.normalizeRGB ) {
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value = [ value[ 0 ] / 255, value[ 1 ] / 255, value[ 2 ] / 255 ];
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}
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if ( this.options && this.options.ignoreZeroRGBs ) {
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if ( value[ 0 ] === 0 && value[ 1 ] === 0 && value[ 2 ] === 0 ) {
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// ignore
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save = false;
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}
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}
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break;
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default:
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break;
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}
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if ( save ) {
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covmat[ lprop ] = value;
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}
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}
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}
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return converted;
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}
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preload() {
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for ( const mn in this.materialsInfo ) {
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this.create( mn );
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}
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}
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getIndex( materialName ) {
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return this.nameLookup[ materialName ];
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}
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getAsArray() {
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let index = 0;
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for ( const mn in this.materialsInfo ) {
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this.materialsArray[ index ] = this.create( mn );
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this.nameLookup[ mn ] = index;
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index ++;
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}
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return this.materialsArray;
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}
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create( materialName ) {
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if ( this.materials[ materialName ] === undefined ) {
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this.createMaterial_( materialName );
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}
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return this.materials[ materialName ];
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}
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createMaterial_( materialName ) {
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// Create material
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const scope = this;
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const mat = this.materialsInfo[ materialName ];
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const params = {
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name: materialName,
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side: this.side
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};
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function resolveURL( baseUrl, url ) {
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if ( typeof url !== 'string' || url === '' ) return ''; // Absolute URL
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if ( /^https?:\/\//i.test( url ) ) return url;
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return baseUrl + url;
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}
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function setMapForType( mapType, value ) {
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if ( params[ mapType ] ) return; // Keep the first encountered texture
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const texParams = scope.getTextureParams( value, params );
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const map = scope.loadTexture( resolveURL( scope.baseUrl, texParams.url ) );
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map.repeat.copy( texParams.scale );
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map.offset.copy( texParams.offset );
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map.wrapS = scope.wrap;
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map.wrapT = scope.wrap;
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params[ mapType ] = map;
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}
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for ( const prop in mat ) {
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const value = mat[ prop ];
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let n;
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if ( value === '' ) continue;
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switch ( prop.toLowerCase() ) {
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// Ns is material specular exponent
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case 'kd':
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// Diffuse color (color under white light) using RGB values
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params.color = new THREE.Color().fromArray( value );
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break;
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case 'ks':
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// Specular color (color when light is reflected from shiny surface) using RGB values
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params.specular = new THREE.Color().fromArray( value );
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break;
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case 'ke':
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// Emissive using RGB values
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params.emissive = new THREE.Color().fromArray( value );
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break;
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case 'map_kd':
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// Diffuse texture map
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setMapForType( 'map', value );
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break;
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case 'map_ks':
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// Specular map
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setMapForType( 'specularMap', value );
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break;
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case 'map_ke':
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// Emissive map
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setMapForType( 'emissiveMap', value );
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break;
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case 'norm':
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setMapForType( 'normalMap', value );
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break;
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case 'map_bump':
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case 'bump':
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// Bump texture map
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setMapForType( 'bumpMap', value );
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break;
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case 'map_d':
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// Alpha map
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setMapForType( 'alphaMap', value );
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params.transparent = true;
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break;
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case 'ns':
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// The specular exponent (defines the focus of the specular highlight)
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// A high exponent results in a tight, concentrated highlight. Ns values normally range from 0 to 1000.
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params.shininess = parseFloat( value );
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break;
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case 'd':
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n = parseFloat( value );
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if ( n < 1 ) {
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params.opacity = n;
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params.transparent = true;
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}
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break;
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case 'tr':
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n = parseFloat( value );
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if ( this.options && this.options.invertTrProperty ) n = 1 - n;
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if ( n > 0 ) {
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params.opacity = 1 - n;
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params.transparent = true;
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}
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break;
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default:
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break;
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}
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}
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this.materials[ materialName ] = new THREE.MeshPhongMaterial( params );
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return this.materials[ materialName ];
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}
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getTextureParams( value, matParams ) {
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const texParams = {
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scale: new THREE.Vector2( 1, 1 ),
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offset: new THREE.Vector2( 0, 0 )
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};
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const items = value.split( /\s+/ );
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let pos;
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pos = items.indexOf( '-bm' );
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if ( pos >= 0 ) {
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matParams.bumpScale = parseFloat( items[ pos + 1 ] );
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items.splice( pos, 2 );
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}
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pos = items.indexOf( '-s' );
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if ( pos >= 0 ) {
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texParams.scale.set( parseFloat( items[ pos + 1 ] ), parseFloat( items[ pos + 2 ] ) );
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items.splice( pos, 4 ); // we expect 3 parameters here!
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}
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pos = items.indexOf( '-o' );
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if ( pos >= 0 ) {
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texParams.offset.set( parseFloat( items[ pos + 1 ] ), parseFloat( items[ pos + 2 ] ) );
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items.splice( pos, 4 ); // we expect 3 parameters here!
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}
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texParams.url = items.join( ' ' ).trim();
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return texParams;
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}
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loadTexture( url, mapping, onLoad, onProgress, onError ) {
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const manager = this.manager !== undefined ? this.manager : THREE.DefaultLoadingManager;
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let loader = manager.getHandler( url );
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if ( loader === null ) {
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loader = new THREE.TextureLoader( manager );
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}
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if ( loader.setCrossOrigin ) loader.setCrossOrigin( this.crossOrigin );
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const texture = loader.load( url, onLoad, onProgress, onError );
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if ( mapping !== undefined ) texture.mapping = mapping;
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return texture;
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}
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}
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THREE.MTLLoader = MTLLoader;
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} )();
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