/**
 * @author alteredq / http://alteredqualia.com/
 */

THREE.Loader = function() {
};

THREE.Loader.prototype = {
	
	// Load models generated by Blender exporter and original OBJ converter (converter_obj_three.py)
	
	loadAsciiOld: function( url, callback ) {
		
		var element = document.createElement( 'script' );
		element.type = 'text/javascript';
		element.onload = callback;
		element.src = url;
		document.getElementsByTagName( "head" )[ 0 ].appendChild( element );

	},

	// Load models generated by slim OBJ converter with ASCII option (converter_obj_three_slim.py -t ascii)
	//  - urlbase parameter is optional (it only applies to models with textures)
	
	loadAscii: function ( url, callback, urlbase ) {
		
		var s = (new Date).getTime(),
			worker = new Worker( url );

		worker.onmessage = function( event ) {
		
			THREE.Loader.prototype.createModel( event.data, callback, urlbase );
			
		};
		
		worker.postMessage( s );
		
	},
	
	// Load models generated by slim OBJ converter with BINARY option (converter_obj_three_slim.py -t binary)
	//  - urlbase parameter is mandatory (it applies to all models, it tells where to find the file with binary buffers)
	//  - binary models consist of two files: JS and BIN
	
	loadBinary: function( url, callback, urlbase ) {
		
		// #1 load JS part via web worker
		
		//  This isn't really necessary, JS part is tiny,
		//  could be done by more ordinary means.
		
		var s = (new Date).getTime(),
			worker = new Worker( url );

		worker.onmessage = function( event ) {
			
			var materials = event.data.materials,
				buffers = event.data.buffers;
			
			// #2 load BIN part via Ajax
			
			//  For some reason it is faster doing loading from here than from within the worker.
			//  Maybe passing of ginormous string as message between threads is costly? 
			//  Also, worker loading huge data by Ajax still freezes browser. Go figure, 
			//  worker with baked ascii JSON data keeps browser more responsive.
			
			THREE.Loader.prototype.loadAjaxBuffers( buffers, materials, callback, urlbase );
			
		};
		
		worker.onerror = function (event) {
			
			alert( "worker.onerror: " + event.message + "\n" + event.data );
			event.preventDefault();
			
		};
		
		worker.postMessage( s );
		
	},

	// Binary AJAX parser based on Magi binary loader
	// https://github.com/kig/magi
	
	// Should look more into HTML5 File API
	// See also other suggestions by Gregg Tavares
	// https://groups.google.com/group/o3d-discuss/browse_thread/thread/a8967bc9ce1e0978

	loadAjaxBuffers: function( buffers, materials, callback, urlbase ) {

		var xhr = new XMLHttpRequest(),
			url = urlbase + "/" + buffers;
	
		xhr.onreadystatechange = function() {
	  
			if ( xhr.readyState == 4 ) {
				
				if ( xhr.status == 200 || xhr.status == 0 ) {
		  
					THREE.Loader.prototype.createBinModel( xhr.responseText, callback, urlbase, materials );
					
				} else {
		  
					alert( "Couldn't load [" + url + "] [" + xhr.status + "]" );
					
				}
			}
		}
		
		xhr.open("GET", url, true);
		xhr.overrideMimeType("text/plain; charset=x-user-defined");
		xhr.setRequestHeader("Content-Type", "text/plain");
		xhr.send(null);
		
	},

	createBinModel: function ( data, callback, urlbase, materials ) {
		
		var Model = function ( urlbase ) {
			
			//var s = (new Date).getTime();
			
			var scope = this,
				currentOffset = 0, 
				md,
				normals = [],
				uvs = [];

			
			THREE.Geometry.call(this);
			
			THREE.Loader.prototype.init_materials( scope, materials, urlbase );
			
			md = parseMetaData( data, currentOffset );
			currentOffset += md.header_bytes;
			
			currentOffset += init_vertices( currentOffset );
			currentOffset += init_normals( currentOffset );
			currentOffset += init_uvs( currentOffset );
			
			currentOffset += init_triangles_flat( currentOffset );
			currentOffset += init_triangles_smooth( currentOffset );
			currentOffset += init_triangles_flat_uv( currentOffset );
			currentOffset += init_triangles_smooth_uv( currentOffset );
			
			currentOffset += init_quads_flat( currentOffset );
			currentOffset += init_quads_smooth( currentOffset );
			currentOffset += init_quads_flat_uv( currentOffset );
			currentOffset += init_quads_smooth_uv( currentOffset );

			this.computeCentroids();
			this.computeNormals();
			
			//var e = (new Date).getTime();
			
			//log( "binary data parse time: " + (e-s) + " ms" );
			
			function parseMetaData( data, offset ) {
				
				var metaData = {
					
					'signature'               :parseString( data, offset, 8 ),
					'header_bytes'            :parseUChar8( data, offset + 8 ),
					
					'vertex_coordinate_bytes' :parseUChar8( data, offset + 9 ),
					'normal_coordinate_bytes' :parseUChar8( data, offset + 10 ),
					'uv_coordinate_bytes'     :parseUChar8( data, offset + 11 ),
					
					'vertex_index_bytes'      :parseUChar8( data, offset + 12 ),
					'normal_index_bytes'      :parseUChar8( data, offset + 13 ),
					'uv_index_bytes'          :parseUChar8( data, offset + 14 ),
					'material_index_bytes'    :parseUChar8( data, offset + 15 ),
				
					'nvertices'    :parseUInt32( data, offset + 16 ),
					'nnormals'     :parseUInt32( data, offset + 16 + 4*1 ),
					'nuvs'         :parseUInt32( data, offset + 16 + 4*2 ),
					
					'ntri_flat'      :parseUInt32( data, offset + 16 + 4*3 ),
					'ntri_smooth'    :parseUInt32( data, offset + 16 + 4*4 ),
					'ntri_flat_uv'   :parseUInt32( data, offset + 16 + 4*5 ),
					'ntri_smooth_uv' :parseUInt32( data, offset + 16 + 4*6 ),
					
					'nquad_flat'      :parseUInt32( data, offset + 16 + 4*7 ),
					'nquad_smooth'    :parseUInt32( data, offset + 16 + 4*8 ),
					'nquad_flat_uv'   :parseUInt32( data, offset + 16 + 4*9 ),
					'nquad_smooth_uv' :parseUInt32( data, offset + 16 + 4*10 )
					
				};

				/*
				log( "signature: " + metaData.signature );
				
				log( "header_bytes: " + metaData.header_bytes );
				log( "vertex_coordinate_bytes: " + metaData.vertex_coordinate_bytes );
				log( "normal_coordinate_bytes: " + metaData.normal_coordinate_bytes );
				log( "uv_coordinate_bytes: " + metaData.uv_coordinate_bytes );
				
				log( "vertex_index_bytes: " + metaData.vertex_index_bytes );
				log( "normal_index_bytes: " + metaData.normal_index_bytes );
				log( "uv_index_bytes: " + metaData.uv_index_bytes );
				log( "material_index_bytes: " + metaData.material_index_bytes );
				
				log( "nvertices: " + metaData.nvertices );
				log( "nnormals: " + metaData.nnormals );
				log( "nuvs: " + metaData.nuvs );
				
				log( "ntri_flat: " + metaData.ntri_flat );
				log( "ntri_smooth: " + metaData.ntri_smooth );
				log( "ntri_flat_uv: " + metaData.ntri_flat_uv );
				log( "ntri_smooth_uv: " + metaData.ntri_smooth_uv );
				
				log( "nquad_flat: " + metaData.nquad_flat );
				log( "nquad_smooth: " + metaData.nquad_smooth );
				log( "nquad_flat_uv: " + metaData.nquad_flat_uv );
				log( "nquad_smooth_uv: " + metaData.nquad_smooth_uv );
				
				var total = metaData.header_bytes
						  + metaData.nvertices * metaData.vertex_coordinate_bytes * 3
						  + metaData.nnormals * metaData.normal_coordinate_bytes * 3
						  + metaData.nuvs * metaData.uv_coordinate_bytes * 2
						  + metaData.ntri_flat * ( metaData.vertex_index_bytes*3 + metaData.material_index_bytes )
						  + metaData.ntri_smooth * ( metaData.vertex_index_bytes*3 + metaData.material_index_bytes + metaData.normal_index_bytes*3 )
						  + metaData.ntri_flat_uv * ( metaData.vertex_index_bytes*3 + metaData.material_index_bytes + metaData.uv_index_bytes*3 )
						  + metaData.ntri_smooth_uv * ( metaData.vertex_index_bytes*3 + metaData.material_index_bytes + metaData.normal_index_bytes*3 + metaData.uv_index_bytes*3 )
						  + metaData.nquad_flat * ( metaData.vertex_index_bytes*4 + metaData.material_index_bytes )
						  + metaData.nquad_smooth * ( metaData.vertex_index_bytes*4 + metaData.material_index_bytes + metaData.normal_index_bytes*4 )
						  + metaData.nquad_flat_uv * ( metaData.vertex_index_bytes*4 + metaData.material_index_bytes + metaData.uv_index_bytes*4 )
						  + metaData.nquad_smooth_uv * ( metaData.vertex_index_bytes*4 + metaData.material_index_bytes + metaData.normal_index_bytes*4 + metaData.uv_index_bytes*4 );
				log( "total bytes: " + total );
				*/
				
				return metaData;
				
			}
			
			function parseString( data, offset, length ) {
				
				return data.substr( offset, length );
				
			}
			
			function parseFloat32( data, offset ) {
				
				var b3 = parseUChar8( data, offset ),
					b2 = parseUChar8( data, offset + 1 ),
					b1 = parseUChar8( data, offset + 2 ),
					b0 = parseUChar8( data, offset + 3 ),
				
					sign = 1 - ( 2 * ( b0 >> 7 ) ),
					exponent = ((( b0 << 1 ) & 0xff) | ( b1 >> 7 )) - 127,
					mantissa = (( b1 & 0x7f ) << 16) | (b2 << 8) | b3;
					
					if (mantissa == 0 && exponent == -127)
						return 0.0;
					
					return sign * ( 1 + mantissa * Math.pow( 2, -23 ) ) * Math.pow( 2, exponent );

			}
			
			function parseUInt32( data, offset ) {
				
				var b0 = parseUChar8( data, offset ),
					b1 = parseUChar8( data, offset + 1 ),
					b2 = parseUChar8( data, offset + 2 ),
					b3 = parseUChar8( data, offset + 3 );
				
				return (b3 << 24) + (b2 << 16) + (b1 << 8) + b0;
			}
			
			function parseUInt16( data, offset ) {
				
				var b0 = parseUChar8( data, offset ),
					b1 = parseUChar8( data, offset + 1 );
				
				return (b1 << 8) + b0;
				
			}
			
			function parseSChar8( data, offset ) {
				
				var b = parseUChar8( data, offset );
				return b > 127 ? b - 256 : b;
				
			}
			
			function parseUChar8( data, offset ) {
				
				return data.charCodeAt( offset ) & 0xff;
			}
			
			function init_vertices( start ) {
				
				var i, x, y, z, 
					stride = md.vertex_coordinate_bytes * 3;
				
				for( i = 0; i < md.nvertices; ++i ) {
					
					x = parseFloat32( data, start + i*stride );
					y = parseFloat32( data, start + i*stride + md.vertex_coordinate_bytes );
					z = parseFloat32( data, start + i*stride + md.vertex_coordinate_bytes*2 );
					
					THREE.Loader.prototype.v( scope, x, y, z );
					
				}
				
				return md.nvertices * stride;
				
			}
			
			function init_normals( start ) {
				
				var i, x, y, z, 
					stride = md.normal_coordinate_bytes * 3;
				
				for( i = 0; i < md.nnormals; ++i ) {
					
					x = parseSChar8( data, start + i*stride );
					y = parseSChar8( data, start + i*stride + md.normal_coordinate_bytes );
					z = parseSChar8( data, start + i*stride + md.normal_coordinate_bytes*2 );
					
					normals.push( x/127, y/127, z/127 );
					
				}
				
				return md.nnormals * stride;
				
			}

			function init_uvs( start ) {
				
				var i, u, v, 
					stride = md.uv_coordinate_bytes * 2;
				
				for( i = 0; i < md.nuvs; ++i ) {
					
					u = parseFloat32( data, start + i*stride );
					v = parseFloat32( data, start + i*stride + md.uv_coordinate_bytes );
					
					uvs.push( u, v );
					
				}
				
				return md.nuvs * stride;
				
			}
			
			function add_tri( start, i, stride ) {
				
				var a, b, c, m;
				
				a = parseUInt32( data, start + i*stride );
				b = parseUInt32( data, start + i*stride + md.vertex_index_bytes );
				c = parseUInt32( data, start + i*stride + md.vertex_index_bytes*2 );
				
				m = parseUInt16( data, start + i*stride + md.vertex_index_bytes*3 );
				
				THREE.Loader.prototype.f3( scope, a, b, c, m );
				
			}
			
			function add_tri_n( start, i, stride ) {
				
				var a, b, c, m, na, nb, nc;
				
				a  = parseUInt32( data, start + i*stride );
				b  = parseUInt32( data, start + i*stride + md.vertex_index_bytes );
				c  = parseUInt32( data, start + i*stride + md.vertex_index_bytes*2 );
				
				m  = parseUInt16( data, start + i*stride + md.vertex_index_bytes*3 );
				
				na = parseUInt32( data, start + i*stride + md.vertex_index_bytes*3 + md.material_index_bytes );
				nb = parseUInt32( data, start + i*stride + md.vertex_index_bytes*3 + md.material_index_bytes + md.normal_index_bytes );
				nc = parseUInt32( data, start + i*stride + md.vertex_index_bytes*3 + md.material_index_bytes + md.normal_index_bytes*2 );
				
				THREE.Loader.prototype.f3n( scope, normals, a, b, c, m, na, nb, nc );
			
			}
			
			function add_quad( start, i, stride ) {
				
				var a, b, c, d, m;
				
				a = parseUInt32( data, start + i*stride );
				b = parseUInt32( data, start + i*stride + md.vertex_index_bytes );
				c = parseUInt32( data, start + i*stride + md.vertex_index_bytes*2 );
				d = parseUInt32( data, start + i*stride + md.vertex_index_bytes*3 );
				
				m = parseUInt16( data, start + i*stride + md.vertex_index_bytes*4 );
				
				THREE.Loader.prototype.f4( scope, a, b, c, d, m );
				
			}
			
			function add_quad_n( start, i, stride ) {
				
				var a, b, c, d, m, na, nb, nc, nd;
				
				a  = parseUInt32( data, start + i*stride );
				b  = parseUInt32( data, start + i*stride + md.vertex_index_bytes );
				c  = parseUInt32( data, start + i*stride + md.vertex_index_bytes*2 );
				d  = parseUInt32( data, start + i*stride + md.vertex_index_bytes*3 );
				
				m  = parseUInt16( data, start + i*stride + md.vertex_index_bytes*4 );
				
				na = parseUInt32( data, start + i*stride + md.vertex_index_bytes*4 + md.material_index_bytes );
				nb = parseUInt32( data, start + i*stride + md.vertex_index_bytes*4 + md.material_index_bytes + md.normal_index_bytes );
				nc = parseUInt32( data, start + i*stride + md.vertex_index_bytes*4 + md.material_index_bytes + md.normal_index_bytes*2 );
				nd = parseUInt32( data, start + i*stride + md.vertex_index_bytes*4 + md.material_index_bytes + md.normal_index_bytes*3 );
				
				THREE.Loader.prototype.f4n( scope, normals, a, b, c, d, m, na, nb, nc, nd );
			
			}
			
			function add_uv3( start, i, stride, offset ) {
				
				var uva, uvb, uvc, u1, u2, u3, v1, v2, v3;
				
				uva = parseUInt32( data, start + i*stride + offset );
				uvb = parseUInt32( data, start + i*stride + offset + md.uv_index_bytes );
				uvc = parseUInt32( data, start + i*stride + offset + md.uv_index_bytes * 2 );
				
				u1 = uvs[ uva*2 ];
				v1 = uvs[ uva*2 + 1];
				
				u2 = uvs[ uvb*2 ];
				v2 = uvs[ uvb*2 + 1];
				
				u3 = uvs[ uvc*2 ];
				v3 = uvs[ uvc*2 + 1];
				
				THREE.Loader.prototype.uv( scope, u1, v1, u2, v2, u3, v3 );				
				
			}
			
			function add_uv4( start, i, stride, offset ) {
				
				var uva, uvb, uvc, uvd, u1, u2, u3, u4, v1, v2, v3, v4;
				
				uva = parseUInt32( data, start + i*stride + offset );
				uvb = parseUInt32( data, start + i*stride + offset + md.uv_index_bytes );
				uvc = parseUInt32( data, start + i*stride + offset + md.uv_index_bytes * 2 );
				uvd = parseUInt32( data, start + i*stride + offset + md.uv_index_bytes * 3 );
				
				u1 = uvs[ uva*2 ];
				v1 = uvs[ uva*2 + 1];
				
				u2 = uvs[ uvb*2 ];
				v2 = uvs[ uvb*2 + 1];
				
				u3 = uvs[ uvc*2 ];
				v3 = uvs[ uvc*2 + 1];

				u4 = uvs[ uvd*2 ];
				v4 = uvs[ uvd*2 + 1];
				
				THREE.Loader.prototype.uv( scope, u1, v1, u2, v2, u3, v3, u4, v4 );				
				
			}
			
			function init_triangles_flat( start ) {
				
				var i, stride = md.vertex_index_bytes * 3 + md.material_index_bytes;
				
				for( i = 0; i < md.ntri_flat; ++i ) {
					
					add_tri( start, i, stride );
					
				}
				
				return md.ntri_flat * stride;
				
			}

			function init_triangles_flat_uv( start ) {
				
				var i, offset = md.vertex_index_bytes * 3 + md.material_index_bytes,
					stride = offset + md.uv_index_bytes * 3;
				
				for( i = 0; i < md.ntri_flat_uv; ++i ) {
					
					add_tri( start, i, stride );
					add_uv3( start, i, stride, md.vertex_index_bytes*3 + md.material_index_bytes );
					
				}
				
				return md.ntri_flat_uv * stride;
				
			}
			
			function init_triangles_smooth( start ) {
			
				var i, stride = md.vertex_index_bytes * 3 + md.material_index_bytes + md.normal_index_bytes * 3;
				
				for( i = 0; i < md.ntri_smooth; ++i ) {
					
					add_tri_n( start, i, stride );
					
				}
				
				return md.ntri_smooth * stride;
				
			}

			function init_triangles_smooth_uv( start ) {
			
				var i, offset = md.vertex_index_bytes * 3 + md.material_index_bytes + md.normal_index_bytes * 3,
					stride = offset + md.uv_index_bytes * 3;
				
				for( i = 0; i < md.ntri_smooth_uv; ++i ) {
					
					add_tri_n( start, i, stride );
					add_uv3( start, i, stride, offset );
					
				}
				
				return md.ntri_smooth * stride;
				
			}

			function init_quads_flat( start ) {
				
				var i, stride = md.vertex_index_bytes * 4 + md.material_index_bytes;
				
				for( i = 0; i < md.nquad_flat; ++i ) {
					
					add_quad( start, i, stride );
					
				}
				
				return md.nquad_flat * stride;
				
			}

			function init_quads_flat_uv( start ) {
				
				var i, offset = md.vertex_index_bytes * 4 + md.material_index_bytes,
					stride = offset + md.uv_index_bytes * 4;
				
				for( i = 0; i < md.nquad_flat_uv; ++i ) {
					
					add_quad( start, i, stride );
					add_uv4( start, i, offset );
					
				}
				
				return md.nquad_flat * stride;
				
			}

			function init_quads_smooth( start ) {
				
				var i, stride = md.vertex_index_bytes * 4 + md.material_index_bytes + md.normal_index_bytes * 4;
				
				for( i = 0; i < md.nquad_smooth; ++i ) {
					
					add_quad_n( start, i, stride );
				}
				
				return md.nquad_smooth * stride;
				
			}

			function init_quads_smooth_uv( start ) {
				
				var i, offset = md.vertex_index_bytes * 4 + md.material_index_bytes + md.normal_index_bytes * 4, 
					stride =  offset + md.uv_index_bytes * 4;
				
				for( i = 0; i < md.nquad_smooth_uv; ++i ) {
					
					add_quad_n( start, i, stride );
					add_uv4( start, i, stride, offset );
					
				}
				
				return md.nquad_smooth * stride;
				
			}
			
		}
		
		Model.prototype = new THREE.Geometry();
		Model.prototype.constructor = Model;
		
		callback( new Model( urlbase ) );
		
	},
	
	createModel: function ( data, callback, urlbase ) {
		
		var Model = function ( urlbase ) {
			
			var scope = this;

			THREE.Geometry.call(this);
			
			THREE.Loader.prototype.init_materials( scope, data.materials, urlbase );
			
			init_vertices();
			init_faces();
			
			this.computeCentroids();
			this.computeNormals();
			
			function init_vertices() {
			
				var i, l, x, y, z;
				
				for( i = 0, l = data.vertices.length/3; i < l; i++ ) {
					
					x = data.vertices[ i*3     ];
					y = data.vertices[ i*3 + 1 ];
					z = data.vertices[ i*3 + 2 ];
					
					THREE.Loader.prototype.v( scope, x, y, z );
					
				}
			
			}

			function init_faces() {
			
				function add_tri( src, i, stride ) {

					var a, b, c, m;
					
					a = src[ i*stride     ];
					b = src[ i*stride + 1 ];
					c = src[ i*stride + 2 ];
					
					m = src[ i*stride + 3 ];
					
					THREE.Loader.prototype.f3( scope, a, b, c, m );
					
				}

				function add_tri_n( src, i, stride ) {
					
					var a, b, c, m, na, nb, nc;
					
					a  = src[ i*stride     ];
					b  = src[ i*stride + 1 ];
					c  = src[ i*stride + 2 ];
					
					m  = src[ i*stride + 3 ];
					
					na = src[ i*stride + 4 ];
					nb = src[ i*stride + 5 ];
					nc = src[ i*stride + 6 ];
					
					THREE.Loader.prototype.f3n( scope, data.normals, a, b, c, m, na, nb, nc );
					
				}
				
				function add_quad( src, i, stride ) {
					
					var a, b, c, d, m;
					
					a = src[ i*stride     ];
					b = src[ i*stride + 1 ];
					c = src[ i*stride + 2 ];
					d = src[ i*stride + 3 ];
					
					m = src[ i*stride + 4 ];
					
					THREE.Loader.prototype.f4( scope, a, b, c, d, m );
					
				}

				function add_quad_n( src, i, stride ) {
					
					var a, b, c, d, m, na, nb, nc, nd;
					
					a  = src[ i*stride     ];
					b  = src[ i*stride + 1 ];
					c  = src[ i*stride + 2 ];
					d  = src[ i*stride + 3 ];
					
					m  = src[ i*stride + 4 ];

					na = src[ i*stride + 5 ];
					nb = src[ i*stride + 6 ];
					nc = src[ i*stride + 7 ];
					nd = src[ i*stride + 8 ];
					
					THREE.Loader.prototype.f4n( scope, data.normals, a, b, c, d, m, na, nb, nc, nd );
					
				}
				
				function add_uv3( src, i, stride, offset ) {
					
					var uva, uvb, uvc, u1, u2, u3, v1, v2, v3;

					uva = src[ i*stride + offset ];
					uvb = src[ i*stride + offset + 1 ];
					uvc = src[ i*stride + offset + 2 ];
					
					u1 = data.uvs[ uva*2 ];
					v1 = data.uvs[ uva*2 + 1 ];
					
					u2 = data.uvs[ uvb*2 ];
					v2 = data.uvs[ uvb*2 + 1 ];
					
					u3 = data.uvs[ uvc*2 ];
					v3 = data.uvs[ uvc*2 + 1 ];
					
					THREE.Loader.prototype.uv( scope, u1, v1, u2, v2, u3, v3 );
					
				}
				
				function add_uv4( src, i, stride, offset ) {
					
					var uva, uvb, uvc, uvd, u1, u2, u3, u4, v1, v2, v3, v4;
					
					uva = src[ i*stride + offset ];
					uvb = src[ i*stride + offset + 1 ];
					uvc = src[ i*stride + offset + 2 ];
					uvd = src[ i*stride + offset + 3 ];
					
					u1 = data.uvs[ uva*2 ];
					v1 = data.uvs[ uva*2 + 1 ];
					
					u2 = data.uvs[ uvb*2 ];
					v2 = data.uvs[ uvb*2 + 1 ];
					
					u3 = data.uvs[ uvc*2 ];
					v3 = data.uvs[ uvc*2 + 1 ];
					
					u4 = data.uvs[ uvd*2 ];
					v4 = data.uvs[ uvd*2 + 1 ];
					
					THREE.Loader.prototype.uv( scope, u1, v1, u2, v2, u3, v3, u4, v4 );
					
				}
				
				var i, l;
				
				for( i = 0, l = data.triangles.length/4; i < l; i++ ) {
				
					add_tri( data.triangles, i, 4 );
					
				}

				for( i = 0, l = data.triangles_uv.length/7; i < l; i++ ) {
					
					add_tri( data.triangles_uv, i, 7 );	
					add_uv3( data.triangles_uv, i, 7, 4 );
				
				}

				for( i = 0, l = data.triangles_n.length/7; i < l; i++ ) {
					
					add_tri_n( data.triangles_n, i, 7 );
					
				}

				for( i = 0, l = data.triangles_n_uv.length/10; i < l; i++ ) {
					
					add_tri_n( data.triangles_n_uv, i, 10 );
					add_uv3( data.triangles_n_uv, i, 10, 7 );
				
				}

				
				for( i = 0, l = data.quads.length/5; i < l; i++ ) {
					
					add_quad( data.quads, i, 5 );
					
				}

				for( i = 0, l = data.quads_uv.length/9; i < l; i++ ) {
					
					add_quad( data.quads_uv, i, 9 );
					add_uv4( data.quads_uv, i, 9, 5 );
				
				}

				for( i = 0, l = data.quads_n.length/9; i < l; i++ ) {
					
					add_quad_n( data.quads_n, i, 9 );
					
				}

				for( i = 0, l = data.quads_n_uv.length/13; i < l; i++ ) {
					
					add_quad_n( data.quads_n_uv, i, 13 );
					add_uv4( data.quads_n_uv, i, 13, 9 );
				
				}
				
			}			
			
		}

		Model.prototype = new THREE.Geometry();
		Model.prototype.constructor = Model;
		
		callback( new Model( urlbase ) );

	},

	v: function( scope, x, y, z ) {
	
		scope.vertices.push( new THREE.Vertex( new THREE.Vector3( x, y, z ) ) );
	
	},
	
	f3: function( scope, a, b, c, mi ) {
		
		var material = scope.materials[ mi ];
		scope.faces.push( new THREE.Face3( a, b, c, null, material ) );
		
	},
	
	f4: function( scope, a, b, c, d, mi ) {
		
		var material = scope.materials[ mi ];
		scope.faces.push( new THREE.Face4( a, b, c, d, null, material ) );
		
	},
	
	f3n: function( scope, normals, a, b, c, mi, na, nb, nc ) {
		
		var material = scope.materials[ mi ],
			nax = normals[ na*3     ],
			nay = normals[ na*3 + 1 ],
			naz = normals[ na*3 + 2 ],
		
			nbx = normals[ nb*3     ],
			nby = normals[ nb*3 + 1 ],
			nbz = normals[ nb*3 + 2 ],
		
			ncx = normals[ nc*3     ],
			ncy = normals[ nc*3 + 1 ],
			ncz = normals[ nc*3 + 2 ];
		
		scope.faces.push( new THREE.Face3( a, b, c, 
						  [new THREE.Vector3( nax, nay, naz ), 
						   new THREE.Vector3( nbx, nby, nbz ), 
						   new THREE.Vector3( ncx, ncy, ncz )], 
						  material ) );
		
	},
	
	f4n: function( scope, normals, a, b, c, d, mi, na, nb, nc, nd ) {
		
		var material = scope.materials[ mi ],
			nax = normals[ na*3     ],
			nay = normals[ na*3 + 1 ],
			naz = normals[ na*3 + 2 ],
		
			nbx = normals[ nb*3     ],
			nby = normals[ nb*3 + 1 ],
			nbz = normals[ nb*3 + 2 ],
		
			ncx = normals[ nc*3     ],
			ncy = normals[ nc*3 + 1 ],
			ncz = normals[ nc*3 + 2 ],
		
			ndx = normals[ nd*3     ],
			ndy = normals[ nd*3 + 1 ],
			ndz = normals[ nd*3 + 2 ];
		
		scope.faces.push( new THREE.Face4( a, b, c, d,
						  [new THREE.Vector3( nax, nay, naz ), 
						   new THREE.Vector3( nbx, nby, nbz ), 
						   new THREE.Vector3( ncx, ncy, ncz ), 
						   new THREE.Vector3( ndx, ndy, ndz )], 
						  material ) );
		
	},
	
	uv: function( scope, u1, v1, u2, v2, u3, v3, u4, v4 ) {
		
		var uv = [];
		uv.push( new THREE.UV( u1, v1 ) );
		uv.push( new THREE.UV( u2, v2 ) );
		uv.push( new THREE.UV( u3, v3 ) );
		if ( u4 && v4 ) uv.push( new THREE.UV( u4, v4 ) );
		scope.uvs.push( uv );
		
	},
	
	init_materials: function( scope, materials, urlbase ) {
		
		scope.materials = [];
		
		for( var i = 0; i < materials.length; ++i ) {
			
			scope.materials[i] = [ THREE.Loader.prototype.createMaterial( materials[i], urlbase ) ];
			
		}
		
	},
	
	createMaterial: function( m, urlbase ) {
	
		function is_pow2( n ) {
			
			var l = Math.log(n) / Math.LN2;
			return Math.floor(l) == l;
			
		}
		
		function nearest_pow2( n ) {
			
			var l = Math.log(n) / Math.LN2;
			return Math.pow( 2, Math.round(l) );
			
		}

		var material, texture, image, color;
		
		if( m.map_diffuse && urlbase ) {
			
			texture = document.createElement( 'canvas' );
			material = new THREE.MeshBitmapMaterial( texture );
			
			image = new Image();
			image.onload = function () {
				
				if ( !is_pow2( this.width ) || !is_pow2( this.height ) ) {
				
					var w = nearest_pow2( this.width ),
						h = nearest_pow2( this.height );
					
					material.bitmap.width = w;
					material.bitmap.height = h;
					material.bitmap.getContext("2d").drawImage( this, 0, 0, w, h );
					
				} else {
					
					material.bitmap = this;
					
				}
				
				material.loaded = 1;
				
			};
			
			image.src = urlbase + "/" + m.map_diffuse;
			
		} else if( m.col_diffuse ) {
			
			color = (m.col_diffuse[0]*255 << 16) + (m.col_diffuse[1]*255 << 8) + m.col_diffuse[2]*255;
			material = new THREE.MeshColorFillMaterial( color, m.transparency );
			
		} else if( m.a_dbg_color ) {
			
			material = new THREE.MeshColorFillMaterial( m.a_dbg_color );
			
		} else {
			
			material = new THREE.MeshColorFillMaterial( 0xeeeeee );
			
		}

		return material;
		
	}
	
};