three.js/examples/js/loaders/OBJLoader.js

/**
 * @author mrdoob / http://mrdoob.com/
 */

THREE.OBJLoader = function () {

	THREE.EventDispatcher.call( this );

};

THREE.OBJLoader.prototype = {

	constructor: THREE.OBJLoader,

	load: function ( url, callback ) {

		var scope = this;
		var request = new XMLHttpRequest();

		request.addEventListener( 'load', function ( event ) {

			var hierarchy = scope.parse( event.target.responseText );

			scope.dispatchEvent( { type: 'load', content: hierarchy } );

			if ( callback ) callback( hierarchy );

		}, false );

		request.addEventListener( 'progress', function ( event ) {

			scope.dispatchEvent( { type: 'progress', loaded: event.loaded, total: event.total } );

		}, false );

		request.addEventListener( 'error', function () {

			scope.dispatchEvent( { type: 'error', message: 'Couldn\'t load URL [' + url + ']' } );

		}, false );

		request.open( 'GET', url, true );
		request.send( null );

	},

	parse: function ( data ) {

		// fixes

		data = data.replace( /\ \\\r\n/g, '' ); // rhino adds ' \\r\n' some times.

		//

		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 );

		}

		function face4( a, b, c, d, normals ) {

			return new THREE.Face4( a, b, c, d, normals );

		}

		function meshN( meshName, materialName ) {

			if ( geometry.vertices.length > 0 ) {

				geometry.mergeVertices();
				geometry.computeCentroids();
				geometry.computeFaceNormals();
				geometry.computeBoundingSphere();

				object.add( mesh );

				geometry = new THREE.Geometry();
				mesh = new THREE.Mesh( geometry, material );

				verticesCount = 0;

			}

			if ( meshName !== undefined ) mesh.name = meshName;
			if ( materialName !== undefined ) {

				material = new THREE.MeshLambertMaterial();
				material.name = materialName;

				mesh.material = material;

			}

		}

		var group = new THREE.Object3D();
		var object = group;

		var geometry = new THREE.Geometry();
		var material = new THREE.MeshLambertMaterial();
		var mesh = new THREE.Mesh( geometry, material );

		var vertices = [];
		var verticesCount = 0;
		var normals = [];
		var uvs = [];

		// 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]

				if ( result[ 4 ] === undefined ) {

					geometry.vertices.push(
						vertices[ parseInt( result[ 1 ] ) - 1 ],
						vertices[ parseInt( result[ 2 ] ) - 1 ],
						vertices[ parseInt( result[ 3 ] ) - 1 ]
					);

					geometry.faces.push( face3(
						verticesCount ++,
						verticesCount ++,
						verticesCount ++
					) );

				} else {

					geometry.vertices.push(
						vertices[ parseInt( result[ 1 ] ) - 1 ],
						vertices[ parseInt( result[ 2 ] ) - 1 ],
						vertices[ parseInt( result[ 3 ] ) - 1 ],
						vertices[ parseInt( result[ 4 ] ) - 1 ]
					);

					geometry.faces.push( face4(
						verticesCount ++,
						verticesCount ++,
						verticesCount ++,
						verticesCount ++
					) );

				}

			} 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]

				if ( result[ 10 ] === undefined ) {

					geometry.vertices.push(
						vertices[ parseInt( result[ 2 ] ) - 1 ],
						vertices[ parseInt( result[ 5 ] ) - 1 ],
						vertices[ parseInt( result[ 8 ] ) - 1 ]
					);

					geometry.faces.push( face3(
						verticesCount ++,
						verticesCount ++,
						verticesCount ++
					) );

					geometry.faceVertexUvs[ 0 ].push( [
						uvs[ parseInt( result[ 3 ] ) - 1 ],
						uvs[ parseInt( result[ 6 ] ) - 1 ],
						uvs[ parseInt( result[ 9 ] ) - 1 ]
					] );

				} else {

					geometry.vertices.push(
						vertices[ parseInt( result[ 2 ] ) - 1 ],
						vertices[ parseInt( result[ 5 ] ) - 1 ],
						vertices[ parseInt( result[ 8 ] ) - 1 ],
						vertices[ parseInt( result[ 11 ] ) - 1 ]
					);

					geometry.faces.push( face4(
						verticesCount ++,
						verticesCount ++,
						verticesCount ++,
						verticesCount ++
					) );

					geometry.faceVertexUvs[ 0 ].push( [
						uvs[ parseInt( result[ 3 ] ) - 1 ],
						uvs[ parseInt( result[ 6 ] ) - 1 ],
						uvs[ parseInt( result[ 9 ] ) - 1 ],
						uvs[ parseInt( result[ 12 ] ) - 1 ]
					] );

				}

			} 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]

				if ( result[ 13 ] === undefined ) {

					geometry.vertices.push(
						vertices[ parseInt( result[ 2 ] ) - 1 ],
						vertices[ parseInt( result[ 6 ] ) - 1 ],
						vertices[ parseInt( result[ 10 ] ) - 1 ]
					);

					geometry.faces.push( face3(
						verticesCount ++,
						verticesCount ++,
						verticesCount ++,
						[
							normals[ parseInt( result[ 4 ] ) - 1 ],
							normals[ parseInt( result[ 8 ] ) - 1 ],
							normals[ parseInt( result[ 12 ] ) - 1 ]
						]
					) );

					geometry.faceVertexUvs[ 0 ].push( [
						uvs[ parseInt( result[ 3 ] ) - 1 ],
						uvs[ parseInt( result[ 7 ] ) - 1 ],
						uvs[ parseInt( result[ 11 ] ) - 1 ]
					] );

				} else {

					geometry.vertices.push(
						vertices[ parseInt( result[ 2 ] ) - 1 ],
						vertices[ parseInt( result[ 6 ] ) - 1 ],
						vertices[ parseInt( result[ 10 ] ) - 1 ],
						vertices[ parseInt( result[ 14 ] ) - 1 ]
					);

					geometry.faces.push( face4(
						verticesCount ++,
						verticesCount ++,
						verticesCount ++,
						verticesCount ++,
						[
							normals[ parseInt( result[ 4 ] ) - 1 ],
							normals[ parseInt( result[ 8 ] ) - 1 ],
							normals[ parseInt( result[ 12 ] ) - 1 ],
							normals[ parseInt( result[ 16 ] ) - 1 ]
						]
					) );

					geometry.faceVertexUvs[ 0 ].push( [
						uvs[ parseInt( result[ 3 ] ) - 1 ],
						uvs[ parseInt( result[ 7 ] ) - 1 ],
						uvs[ parseInt( result[ 11 ] ) - 1 ],
						uvs[ parseInt( result[ 15 ] ) - 1 ]
					] );

				}

			} 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]

				if ( result[ 10 ] === undefined ) {

					geometry.vertices.push(
						vertices[ parseInt( result[ 2 ] ) - 1 ],
						vertices[ parseInt( result[ 5 ] ) - 1 ],
						vertices[ parseInt( result[ 8 ] ) - 1 ]
					);

					geometry.faces.push( face3(
						verticesCount ++,
						verticesCount ++,
						verticesCount ++,
						[
							normals[ parseInt( result[ 3 ] ) - 1 ],
							normals[ parseInt( result[ 6 ] ) - 1 ],
							normals[ parseInt( result[ 9 ] ) - 1 ]
						]
					) );

				} else {

					geometry.vertices.push(
						vertices[ parseInt( result[ 2 ] ) - 1 ],
						vertices[ parseInt( result[ 5 ] ) - 1 ],
						vertices[ parseInt( result[ 8 ] ) - 1 ],
						vertices[ parseInt( result[ 11 ] ) - 1 ]
					);

					geometry.faces.push( face4(
						verticesCount ++,
						verticesCount ++,
						verticesCount ++,
						verticesCount ++,
						[
							normals[ parseInt( result[ 3 ] ) - 1 ],
							normals[ parseInt( result[ 6 ] ) - 1 ],
							normals[ parseInt( result[ 9 ] ) - 1 ],
							normals[ parseInt( result[ 12 ] ) - 1 ]
						]
					) );

				}

			} else if ( line.startsWith( "o " ) ) {

				// object

				object = new THREE.Object3D();
				object.name = line.substring( 2 ).trim();
				group.add( object );

			} else if ( line.startsWith( "g " ) ) {

				// group

				meshN( line.substring( 2 ).trim(), undefined );

			} else if ( line.startsWith( "usemtl " ) ) {

				// material

				meshN( undefined, line.substring( 7 ).trim() );

			} else if ( line.startsWith( "mtllib ") ) {

				// mtl file

			} else if ( line.startsWith( "s ") ) {

				// smooth shading

			} else {

				// console.log( "THREE.OBJLoader: Unhandled line " + line );

			}

		}

		// add the last group
		meshN( undefined, undefined );

		return group;

	}

}