text: /**
   * Loads a Wavefront .obj file with materials
   *
   * @author mrdoob / http://mrdoob.com/
   * @author angelxuanchang
   */
  
  THREE.OBJMTLLoader = function ( manager ) {
  
  	this.manager = ( manager !== undefined ) ? manager : THREE.DefaultLoadingManager;
  
  };
  
  THREE.OBJMTLLoader.prototype = {
  
  	constructor: THREE.OBJMTLLoader,
  
  	load: function ( url, mtlurl, onLoad, onProgress, onError ) {
  
  		var scope = this;
  
  		var mtlLoader = new THREE.MTLLoader( url.substr( 0, url.lastIndexOf( "/" ) + 1 ) );
  		mtlLoader.load( mtlurl, function ( materials ) {
  
  			var materialsCreator = materials;
  			materialsCreator.preload();
  
  			var loader = new THREE.XHRLoader( scope.manager );
  			loader.setCrossOrigin( this.crossOrigin );
  			loader.load( url, function ( text ) {
  
  				var object = scope.parse( text );
  
  				object.traverse( function ( object ) {
  
  					if ( object instanceof THREE.Mesh ) {
  
  						if ( object.material.name ) {
  
  							var material = materialsCreator.create( object.material.name );
  
  							if ( material ) object.material = material;
  
  						}
  
  					}
  
  				} );
  
  				onLoad( object );
  
  			}, onProgress, onError );
  
  		}, onProgress, onError );
  
  	},
  
  	/**
  	 * Parses loaded .obj file
  	 * @param data - content of .obj file
  	 * @param mtllibCallback - callback to handle mtllib declaration (optional)
  	 * @return {THREE.Object3D} - Object3D (with default material)
  	 */
  
  	parse: function ( data, mtllibCallback ) {
  
  		function vector( x, y, z ) {
  
  			return new THREE.Vector3( x, y, z );
  
  		}
  
  		function uv( u, v ) {
  
  			return new THREE.Vector2( u, v );
  
  		}
  
  		function face3( a, b, c, normals ) {
  
  			return new THREE.Face3( a, b, c, normals );
  
  		}
  
  		var face_offset = 0;
  
  		function meshN( meshName, materialName ) {
  
  			if ( vertices.length > 0 ) {
  
  				geometry.vertices = vertices;
  
  				geometry.mergeVertices();
  				geometry.computeFaceNormals();
  				geometry.computeBoundingSphere();
  
  				object.add( mesh );
  
  				geometry = new THREE.Geometry();
  				mesh = new THREE.Mesh( geometry, material );
  
  			}
  
  			if ( meshName !== undefined ) mesh.name = meshName;
  
  			if ( materialName !== undefined ) {
  
  				material = new THREE.MeshLambertMaterial();
  				material.name = materialName;
  
  				mesh.material = material;
  
  			}
  
  		}
  
  		var group = new THREE.Group();
  		var object = group;
  
  		var geometry = new THREE.Geometry();
  		var material = new THREE.MeshLambertMaterial();
  		var mesh = new THREE.Mesh( geometry, material );
  
  		var vertices = [];
  		var normals = [];
  		var uvs = [];
  
  		function add_face( a, b, c, normals_inds ) {
  
  			if ( normals_inds === undefined ) {
  
  				geometry.faces.push( face3(
  					parseInt( a ) - (face_offset + 1),
  					parseInt( b ) - (face_offset + 1),
  					parseInt( c ) - (face_offset + 1)
  				) );
  
  			} else {
  
  				geometry.faces.push( face3(
  					parseInt( a ) - (face_offset + 1),
  					parseInt( b ) - (face_offset + 1),
  					parseInt( c ) - (face_offset + 1),
  					[
  						normals[ parseInt( normals_inds[ 0 ] ) - 1 ].clone(),
  						normals[ parseInt( normals_inds[ 1 ] ) - 1 ].clone(),
  						normals[ parseInt( normals_inds[ 2 ] ) - 1 ].clone()
  					]
  				) );
  
  			}
  
  		}
  
  		function add_uvs( a, b, c ) {
  
  			geometry.faceVertexUvs[ 0 ].push( [
  				uvs[ parseInt( a ) - 1 ].clone(),
  				uvs[ parseInt( b ) - 1 ].clone(),
  				uvs[ parseInt( c ) - 1 ].clone()
  			] );
  
  		}
  
  		function handle_face_line(faces, uvs, normals_inds) {
  
  			if ( faces[ 3 ] === undefined ) {
  
  				add_face( faces[ 0 ], faces[ 1 ], faces[ 2 ], normals_inds );
  
  				if (!(uvs === undefined) && uvs.length > 0) {
  					add_uvs( uvs[ 0 ], uvs[ 1 ], uvs[ 2 ] );
  				}
  
  			} else {
  
  				if (!(normals_inds === undefined) && normals_inds.length > 0) {
  
  					add_face( faces[ 0 ], faces[ 1 ], faces[ 3 ], [ normals_inds[ 0 ], normals_inds[ 1 ], normals_inds[ 3 ] ]);
  					add_face( faces[ 1 ], faces[ 2 ], faces[ 3 ], [ normals_inds[ 1 ], normals_inds[ 2 ], normals_inds[ 3 ] ]);
  
  				} else {
  
  					add_face( faces[ 0 ], faces[ 1 ], faces[ 3 ]);
  					add_face( faces[ 1 ], faces[ 2 ], faces[ 3 ]);
  
  				}
  
  				if (!(uvs === undefined) && uvs.length > 0) {
  
  					add_uvs( uvs[ 0 ], uvs[ 1 ], uvs[ 3 ] );
  					add_uvs( uvs[ 1 ], uvs[ 2 ], uvs[ 3 ] );
  
  				}
  
  			}
  
  		}
  
  
  		// v float float float
  
  		var vertex_pattern = /v( +[\d|\.|\+|\-|e]+)( +[\d|\.|\+|\-|e]+)( +[\d|\.|\+|\-|e]+)/;
  
  		// vn float float float
  
  		var normal_pattern = /vn( +[\d|\.|\+|\-|e]+)( +[\d|\.|\+|\-|e]+)( +[\d|\.|\+|\-|e]+)/;
  
  		// vt float float
  
  		var uv_pattern = /vt( +[\d|\.|\+|\-|e]+)( +[\d|\.|\+|\-|e]+)/;
  
  		// f vertex vertex vertex ...
  
  		var face_pattern1 = /f( +\d+)( +\d+)( +\d+)( +\d+)?/;
  
  		// f vertex/uv vertex/uv vertex/uv ...
  
  		var face_pattern2 = /f( +(\d+)\/(\d+))( +(\d+)\/(\d+))( +(\d+)\/(\d+))( +(\d+)\/(\d+))?/;
  
  		// f vertex/uv/normal vertex/uv/normal vertex/uv/normal ...
  
  		var face_pattern3 = /f( +(\d+)\/(\d+)\/(\d+))( +(\d+)\/(\d+)\/(\d+))( +(\d+)\/(\d+)\/(\d+))( +(\d+)\/(\d+)\/(\d+))?/;
  
  		// f vertex//normal vertex//normal vertex//normal ...
  
  		var face_pattern4 = /f( +(\d+)\/\/(\d+))( +(\d+)\/\/(\d+))( +(\d+)\/\/(\d+))( +(\d+)\/\/(\d+))?/
  
  		//
  
  		var lines = data.split( "\n" );
  
  		for ( var i = 0; i < lines.length; i ++ ) {
  
  			var line = lines[ i ];
  			line = line.trim();
  
  			var result;
  
  			if ( line.length === 0 || line.charAt( 0 ) === '#' ) {
  
  				continue;
  
  			} else if ( ( result = vertex_pattern.exec( line ) ) !== null ) {
  
  				// ["v 1.0 2.0 3.0", "1.0", "2.0", "3.0"]
  
  				vertices.push( vector(
  					parseFloat( result[ 1 ] ),
  					parseFloat( result[ 2 ] ),
  					parseFloat( result[ 3 ] )
  				) );
  
  			} else if ( ( result = normal_pattern.exec( line ) ) !== null ) {
  
  				// ["vn 1.0 2.0 3.0", "1.0", "2.0", "3.0"]
  
  				normals.push( vector(
  					parseFloat( result[ 1 ] ),
  					parseFloat( result[ 2 ] ),
  					parseFloat( result[ 3 ] )
  				) );
  
  			} else if ( ( result = uv_pattern.exec( line ) ) !== null ) {
  
  				// ["vt 0.1 0.2", "0.1", "0.2"]
  
  				uvs.push( uv(
  					parseFloat( result[ 1 ] ),
  					parseFloat( result[ 2 ] )
  				) );
  
  			} else if ( ( result = face_pattern1.exec( line ) ) !== null ) {
  
  				// ["f 1 2 3", "1", "2", "3", undefined]
  
  				handle_face_line([ result[ 1 ], result[ 2 ], result[ 3 ], result[ 4 ] ]);
  
  			} else if ( ( result = face_pattern2.exec( line ) ) !== null ) {
  
  				// ["f 1/1 2/2 3/3", " 1/1", "1", "1", " 2/2", "2", "2", " 3/3", "3", "3", undefined, undefined, undefined]
  
  				handle_face_line(
  					[ result[ 2 ], result[ 5 ], result[ 8 ], result[ 11 ] ], //faces
  					[ result[ 3 ], result[ 6 ], result[ 9 ], result[ 12 ] ] //uv
  				);
  
  			} else if ( ( result = face_pattern3.exec( line ) ) !== null ) {
  
  				// ["f 1/1/1 2/2/2 3/3/3", " 1/1/1", "1", "1", "1", " 2/2/2", "2", "2", "2", " 3/3/3", "3", "3", "3", undefined, undefined, undefined, undefined]
  
  				handle_face_line(
  					[ result[ 2 ], result[ 6 ], result[ 10 ], result[ 14 ] ], //faces
  					[ result[ 3 ], result[ 7 ], result[ 11 ], result[ 15 ] ], //uv
  					[ result[ 4 ], result[ 8 ], result[ 12 ], result[ 16 ] ] //normal
  				);
  
  			} else if ( ( result = face_pattern4.exec( line ) ) !== null ) {
  
  				// ["f 1//1 2//2 3//3", " 1//1", "1", "1", " 2//2", "2", "2", " 3//3", "3", "3", undefined, undefined, undefined]
  
  				handle_face_line(
  					[ result[ 2 ], result[ 5 ], result[ 8 ], result[ 11 ] ], //faces
  					[ ], //uv
  					[ result[ 3 ], result[ 6 ], result[ 9 ], result[ 12 ] ] //normal
  				);
  
  			} else if ( /^o /.test( line ) ) {
  
  				// object
  
  				meshN();
  				face_offset = face_offset + vertices.length;
  				vertices = [];
  				object = new THREE.Object3D();
  				object.name = line.substring( 2 ).trim();
  				group.add( object );
  
  			} else if ( /^g /.test( line ) ) {
  
  				// group
  
  				meshN( line.substring( 2 ).trim(), undefined );
  
  			} else if ( /^usemtl /.test( line ) ) {
  
  				// material
  
  				meshN( undefined, line.substring( 7 ).trim() );
  
  			} else if ( /^mtllib /.test( line ) ) {
  
  				// mtl file
  
  				if ( mtllibCallback ) {
  
  					var mtlfile = line.substring( 7 );
  					mtlfile = mtlfile.trim();
  					mtllibCallback( mtlfile );
  
  				}
  
  			} else if ( /^s /.test( line ) ) {
  
  				// Smooth shading
  
  			} else {
  
  				console.log( "THREE.OBJMTLLoader: Unhandled line " + line );
  
  			}
  
  		}
  
  		//Add last object
  		meshN(undefined, undefined);
  
  		return group;
  
  	}
  
  };
  
  THREE.EventDispatcher.prototype.apply( THREE.OBJMTLLoader.prototype );
  