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/** * Loads a Wavefront .mtl file specifying materials * * @author angelxuanchang */
THREE.MTLLoader = function( manager ) {
this.manager = ( manager !== undefined ) ? manager : THREE.DefaultLoadingManager;
};
Object.assign( THREE.MTLLoader.prototype, THREE.EventDispatcher.prototype, {
/** * 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 setTexturePath * * @note In order for relative texture references to resolve correctly * you must call setPath and/or setTexturePath explicitly prior to load. */ load: function ( url, onLoad, onProgress, onError ) {
var scope = this;
var loader = new THREE.XHRLoader( this.manager ); loader.setPath( this.path ); loader.load( url, function ( text ) {
onLoad( scope.parse( text ) );
}, onProgress, onError );
},
/** * Set base path for resolving references. * If set this path will be prepended to each loaded and found reference. * * @see setTexturePath * @param {String} path * * @example * mtlLoader.setPath( 'assets/obj/' ); * mtlLoader.load( 'my.mtl', ... ); */ setPath: function ( path ) {
this.path = path;
},
/** * Set base path for resolving texture references. * If set this path will be prepended found texture reference. * If not set and setPath is, it will be used as texture base path. * * @see setPath * @param {String} path * * @example * mtlLoader.setPath( 'assets/obj/' ); * mtlLoader.setTexturePath( 'assets/textures/' ); * mtlLoader.load( 'my.mtl', ... ); */ setTexturePath: function( path ) {
this.texturePath = path;
},
setBaseUrl: function( path ) {
console.warn( 'THREE.MTLLoader: .setBaseUrl() is deprecated. Use .setTexturePath( path ) for texture path or .setPath( path ) for general base path instead.' );
this.setTexturePath( path );
},
setCrossOrigin: function ( value ) {
this.crossOrigin = value;
},
setMaterialOptions: function ( value ) {
this.materialOptions = value;
},
/** * Parses a MTL file. * * @param {String} text - Content of MTL file * @return {THREE.MTLLoader.MaterialCreator} * * @see setPath setTexturePath * * @note In order for relative texture references to resolve correctly * you must call setPath and/or setTexturePath explicitly prior to parse. */ parse: function ( text ) {
var lines = text.split( '\n' ); var info = {}; var delimiter_pattern = /\s+/; var materialsInfo = {};
for ( var i = 0; i < lines.length; i ++ ) {
var line = lines[ i ]; line = line.trim();
if ( line.length === 0 || line.charAt( 0 ) === '#' ) {
// Blank line or comment ignore
continue;
}
var pos = line.indexOf( ' ' );
var key = ( pos >= 0 ) ? line.substring( 0, pos ) : line; key = key.toLowerCase();
var value = ( pos >= 0 ) ? line.substring( pos + 1 ) : ''; value = value.trim();
if ( key === 'newmtl' ) {
// New material
info = { name: value }; materialsInfo[ value ] = info;
} else if ( info ) {
if ( key === 'ka' || key === 'kd' || key === 'ks' ) {
var ss = value.split( delimiter_pattern, 3 ); info[ key ] = [ parseFloat( ss[ 0 ] ), parseFloat( ss[ 1 ] ), parseFloat( ss[ 2 ] ) ];
} else {
info[ key ] = value;
}
}
}
var materialCreator = new THREE.MTLLoader.MaterialCreator( this.texturePath || this.path, this.materialOptions ); materialCreator.setCrossOrigin( this.crossOrigin ); materialCreator.setManager( this.manager ); materialCreator.setMaterials( materialsInfo ); return materialCreator;
}
} );
/** * Create a new THREE-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 * THREE.FrontSide (default), THREE.BackSide, THREE.DoubleSide * wrap: What type of wrapping to apply for textures * THREE.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 */
THREE.MTLLoader.MaterialCreator = function( baseUrl, options ) {
this.baseUrl = baseUrl || ''; this.options = options; this.materialsInfo = {}; this.materials = {}; this.materialsArray = []; this.nameLookup = {};
this.side = ( this.options && this.options.side ) ? this.options.side : THREE.FrontSide; this.wrap = ( this.options && this.options.wrap ) ? this.options.wrap : THREE.RepeatWrapping;
};
THREE.MTLLoader.MaterialCreator.prototype = {
constructor: THREE.MTLLoader.MaterialCreator,
setCrossOrigin: function ( value ) {
this.crossOrigin = value;
},
setManager: function ( value ) {
this.manager = value;
},
setMaterials: function( materialsInfo ) {
this.materialsInfo = this.convert( materialsInfo ); this.materials = {}; this.materialsArray = []; this.nameLookup = {};
},
convert: function( materialsInfo ) {
if ( ! this.options ) return materialsInfo;
var converted = {};
for ( var mn in materialsInfo ) {
// Convert materials info into normalized form based on options
var mat = materialsInfo[ mn ];
var covmat = {};
converted[ mn ] = covmat;
for ( var prop in mat ) {
var save = true; var value = mat[ prop ]; var 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[ 1 ] === 0 ) {
// ignore
save = false;
}
}
break;
default:
break; }
if ( save ) {
covmat[ lprop ] = value;
}
}
}
return converted;
},
preload: function () {
for ( var mn in this.materialsInfo ) {
this.create( mn );
}
},
getIndex: function( materialName ) {
return this.nameLookup[ materialName ];
},
getAsArray: function() {
var index = 0;
for ( var mn in this.materialsInfo ) {
this.materialsArray[ index ] = this.create( mn ); this.nameLookup[ mn ] = index; index ++;
}
return this.materialsArray;
},
create: function ( materialName ) {
if ( this.materials[ materialName ] === undefined ) {
this.createMaterial_( materialName );
}
return this.materials[ materialName ];
},
createMaterial_: function ( materialName ) {
// Create material
var mat = this.materialsInfo[ materialName ]; var params = {
name: materialName, side: this.side
};
var resolveURL = function ( baseUrl, url ) {
if ( typeof url !== 'string' || url === '' ) return '';
// Absolute URL
if ( /^https?:\/\//i.test( url ) ) { return url; }
return baseUrl + url; };
for ( var prop in mat ) {
var value = mat[ prop ];
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 THREE.Color().fromArray( value );
break;
case 'ks':
// Specular color (color when light is reflected from shiny surface) using RGB values
params.specular = new THREE.Color().fromArray( value );
break;
case 'map_kd':
// Diffuse texture map
if ( params.map ) break; // Keep the first encountered texture
params.map = this.loadTexture( resolveURL( this.baseUrl, value ) ); params.map.wrapS = this.wrap; params.map.wrapT = this.wrap;
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':
if ( value < 1 ) {
params.opacity = value; params.transparent = true;
}
break;
case 'Tr':
if ( value > 0 ) {
params.opacity = 1 - value; params.transparent = true;
}
break;
case 'map_bump': case 'bump':
// Bump texture map
if ( params.bumpMap ) break; // Keep the first encountered texture
params.bumpMap = this.loadTexture( resolveURL( this.baseUrl, value ) ); params.bumpMap.wrapS = this.wrap; params.bumpMap.wrapT = this.wrap;
break;
default: break;
}
}
this.materials[ materialName ] = new THREE.MeshPhongMaterial( params ); return this.materials[ materialName ];
},
loadTexture: function ( url, mapping, onLoad, onProgress, onError ) {
var texture; var loader = THREE.Loader.Handlers.get( url ); var manager = ( this.manager !== undefined ) ? this.manager : THREE.DefaultLoadingManager;
if ( loader === null ) {
loader = new THREE.TextureLoader( manager );
}
if ( loader.setCrossOrigin ) loader.setCrossOrigin( this.crossOrigin ); texture = loader.load( url, onLoad, onProgress, onError );
if ( mapping !== undefined ) texture.mapping = mapping;
return texture;
}
};
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