/**
* Loads a Wavefront .mtl file specifying materials
*
* @author angelxuanchang
*/
THREE.MTLLoader = function( baseUrl, options, crossOrigin ) {
this.baseUrl = baseUrl;
this.options = options;
this.crossOrigin = crossOrigin;
};
THREE.MTLLoader.prototype = {
constructor: THREE.MTLLoader,
load: function ( url, onLoad, onProgress, onError ) {
var scope = this;
var loader = new THREE.XHRLoader();
loader.setCrossOrigin( this.crossOrigin );
loader.load( url, function ( text ) {
onLoad( scope.parse( text ) );
}, onProgress, onError );
},
/**
* Parses loaded MTL file
* @param text - Content of MTL file
* @return {THREE.MTLLoader.MaterialCreator}
*/
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.baseUrl, this.options );
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
* invertTransparency: If transparency need to be inverted (inversion is needed if d = 0 is fully opaque)
* Default: false (d = 1 is fully opaque)
* @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,
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;
case 'd':
// According to MTL format (http://paulbourke.net/dataformats/mtl/):
// d is dissolve for current material
// factor of 1.0 is fully opaque, a factor of 0 is fully dissolved (completely transparent)
if ( this.options && this.options.invertTransparency ) {
value = 1 - value;
}
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
};
for ( var prop in mat ) {
var value = mat[ prop ];
switch ( prop.toLowerCase() ) {
// Ns is material specular exponent
case 'kd':
// Diffuse color (color under white light) using RGB values
params[ 'diffuse' ] = new THREE.Color().fromArray( value );
break;
case 'ka':
// Ambient color (color under shadow) using RGB values
params[ 'ambient' ] = 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
params[ 'map' ] = this.loadTexture( 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'] = value;
break;
case 'd':
// According to MTL format (http://paulbourke.net/dataformats/mtl/):
// d is dissolve for current material
// factor of 1.0 is fully opaque, a factor of 0 is fully dissolved (completely transparent)
if ( value < 1 ) {
params['transparent'] = true;
params['opacity'] = value;
}
break;
default:
break;
}
}
if ( params[ 'diffuse' ] ) {
if ( !params[ 'ambient' ]) params[ 'ambient' ] = params[ 'diffuse' ];
params[ 'color' ] = params[ 'diffuse' ];
}
this.materials[ materialName ] = new THREE.MeshPhongMaterial( params );
return this.materials[ materialName ];
},
loadTexture: function ( url, mapping, onLoad, onError ) {
var texture;
var loader = THREE.Loader.Handlers.get( url );
if ( loader !== null ) {
texture = loader.load( url, onLoad );
} else {
texture = new THREE.Texture();
loader = new THREE.ImageLoader();
loader.crossOrigin = this.crossOrigin;
loader.load( url, function ( image ) {
texture.image = THREE.MTLLoader.ensurePowerOfTwo_( image );
texture.needsUpdate = true;
if ( onLoad ) onLoad( texture );
} );
}
texture.mapping = mapping;
return texture;
}
};
THREE.MTLLoader.ensurePowerOfTwo_ = function ( image ) {
if ( ! THREE.Math.isPowerOfTwo( image.width ) || ! THREE.Math.isPowerOfTwo( image.height ) ) {
var canvas = document.createElement( "canvas" );
canvas.width = THREE.MTLLoader.nextHighestPowerOfTwo_( image.width );
canvas.height = THREE.MTLLoader.nextHighestPowerOfTwo_( image.height );
var ctx = canvas.getContext("2d");
ctx.drawImage( image, 0, 0, image.width, image.height, 0, 0, canvas.width, canvas.height );
return canvas;
}
return image;
};
THREE.MTLLoader.nextHighestPowerOfTwo_ = function( x ) {
--x;
for ( var i = 1; i < 32; i <<= 1 ) {
x = x | x >> i;
}
return x + 1;
};
THREE.EventDispatcher.prototype.apply( THREE.MTLLoader.prototype );