mirror of
https://github.com/Doodle3D/Doodle3D-Slicer.git
synced 2024-12-26 04:43:49 +01:00
442 lines
8.8 KiB
JavaScript
442 lines
8.8 KiB
JavaScript
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/**
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* Loads a Wavefront .mtl file specifying materials
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*
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* @author angelxuanchang
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*/
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THREE.MTLLoader = function( baseUrl, options, crossOrigin ) {
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this.baseUrl = baseUrl;
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this.options = options;
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this.crossOrigin = crossOrigin;
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};
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THREE.MTLLoader.prototype = {
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constructor: THREE.MTLLoader,
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load: function ( url, onLoad, onProgress, onError ) {
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var scope = this;
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var loader = new THREE.XHRLoader();
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loader.setCrossOrigin( this.crossOrigin );
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loader.load( url, function ( text ) {
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onLoad( scope.parse( text ) );
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}, onProgress, onError );
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},
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/**
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* Parses loaded MTL file
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* @param text - Content of MTL file
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* @return {THREE.MTLLoader.MaterialCreator}
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*/
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parse: function ( text ) {
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var lines = text.split( "\n" );
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var info = {};
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var delimiter_pattern = /\s+/;
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var materialsInfo = {};
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for ( var i = 0; i < lines.length; i ++ ) {
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var 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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var pos = line.indexOf( ' ' );
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var key = ( pos >= 0 ) ? line.substring( 0, pos ) : line;
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key = key.toLowerCase();
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var 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 = { name: value };
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materialsInfo[ value ] = info;
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} else if ( info ) {
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if ( key === "ka" || key === "kd" || key === "ks" ) {
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var 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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var materialCreator = new THREE.MTLLoader.MaterialCreator( this.baseUrl, this.options );
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materialCreator.crossOrigin = this.crossOrigin
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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 THREE-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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* invertTransparency: If transparency need to be inverted (inversion is needed if d = 0 is fully opaque)
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* Default: false (d = 1 is fully opaque)
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* @constructor
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*/
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THREE.MTLLoader.MaterialCreator = function( 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.side = ( this.options && this.options.side ) ? this.options.side : THREE.FrontSide;
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this.wrap = ( this.options && this.options.wrap ) ? this.options.wrap : THREE.RepeatWrapping;
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};
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THREE.MTLLoader.MaterialCreator.prototype = {
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constructor: THREE.MTLLoader.MaterialCreator,
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setMaterials: function( 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: function( materialsInfo ) {
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if ( !this.options ) return materialsInfo;
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var converted = {};
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for ( var mn in materialsInfo ) {
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// Convert materials info into normalized form based on options
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var mat = materialsInfo[ mn ];
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var covmat = {};
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converted[ mn ] = covmat;
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for ( var prop in mat ) {
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var save = true;
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var value = mat[ prop ];
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var 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[ 1 ] === 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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case 'd':
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// According to MTL format (http://paulbourke.net/dataformats/mtl/):
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// d is dissolve for current material
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// factor of 1.0 is fully opaque, a factor of 0 is fully dissolved (completely transparent)
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if ( this.options && this.options.invertTransparency ) {
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value = 1 - value;
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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: function () {
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for ( var mn in this.materialsInfo ) {
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this.create( mn );
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}
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},
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getIndex: function( materialName ) {
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return this.nameLookup[ materialName ];
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},
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getAsArray: function() {
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var index = 0;
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for ( var 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: function ( 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_: function ( materialName ) {
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// Create material
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var mat = this.materialsInfo[ materialName ];
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var params = {
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name: materialName,
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side: this.side
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};
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for ( var prop in mat ) {
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var value = mat[ prop ];
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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[ 'diffuse' ] = new THREE.Color().fromArray( value );
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break;
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case 'ka':
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// Ambient color (color under shadow) using RGB values
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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 'map_kd':
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// Diffuse texture map
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params[ 'map' ] = this.loadTexture( this.baseUrl + value );
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params[ 'map' ].wrapS = this.wrap;
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params[ 'map' ].wrapT = this.wrap;
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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'] = value;
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break;
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case 'd':
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// According to MTL format (http://paulbourke.net/dataformats/mtl/):
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// d is dissolve for current material
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// factor of 1.0 is fully opaque, a factor of 0 is fully dissolved (completely transparent)
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if ( value < 1 ) {
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params['transparent'] = true;
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params['opacity'] = value;
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}
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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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if ( params[ 'bumpMap' ] ) break; // Avoid loading twice.
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params[ 'bumpMap' ] = this.loadTexture( this.baseUrl + value );
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params[ 'bumpMap' ].wrapS = this.wrap;
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params[ 'bumpMap' ].wrapT = this.wrap;
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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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if ( params[ 'diffuse' ] ) {
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params[ 'color' ] = params[ 'diffuse' ];
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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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loadTexture: function ( url, mapping, onLoad, onError ) {
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var texture;
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var loader = THREE.Loader.Handlers.get( url );
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if ( loader !== null ) {
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texture = loader.load( url, onLoad );
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} else {
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texture = new THREE.Texture();
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loader = new THREE.ImageLoader();
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loader.crossOrigin = this.crossOrigin;
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loader.load( url, function ( image ) {
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texture.image = THREE.MTLLoader.ensurePowerOfTwo_( image );
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texture.needsUpdate = true;
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if ( onLoad ) onLoad( texture );
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} );
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}
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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.ensurePowerOfTwo_ = function ( image ) {
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if ( ! THREE.Math.isPowerOfTwo( image.width ) || ! THREE.Math.isPowerOfTwo( image.height ) ) {
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var canvas = document.createElement( "canvas" );
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canvas.width = THREE.MTLLoader.nextHighestPowerOfTwo_( image.width );
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canvas.height = THREE.MTLLoader.nextHighestPowerOfTwo_( image.height );
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var ctx = canvas.getContext("2d");
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ctx.drawImage( image, 0, 0, image.width, image.height, 0, 0, canvas.width, canvas.height );
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return canvas;
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}
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return image;
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};
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THREE.MTLLoader.nextHighestPowerOfTwo_ = function( x ) {
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-- x;
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for ( var i = 1; i < 32; i <<= 1 ) {
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x = x | x >> i;
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}
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return x + 1;
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};
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THREE.EventDispatcher.prototype.apply( THREE.MTLLoader.prototype );
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