three.js/examples/js/loaders/ObjectLoader.js

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

THREE.ObjectLoader = function ( manager ) {

	this.manager = ( manager !== undefined ) ? manager : THREE.DefaultLoadingManager;

};

THREE.ObjectLoader.prototype = {

	constructor: THREE.ObjectLoader,

	load: function ( url, callback ) {

		var scope = this;

		this.manager.add( url, 'text', function ( event ) {

			if ( callback !== undefined ) {

				callback( scope.parse( JSON.parse( event.target.responseText ) ) );

			}

		} );

	},

	parse: function ( json ) {

		var geometries = this.parseGeometries( json.geometries );
		var materials = this.parseMaterials( json.materials );
		var object = this.parseObject( json.object, geometries, materials );

		return object;

	},

	parseGeometries: function ( json ) {

		var geometries = {};

		if ( json !== undefined ) {

			var loader = new THREE.JSONLoader();

			for ( var i = 0, l = json.length; i < l; i ++ ) {

				var geometry;
				var data = json[ i ];

				switch ( data.type ) {

					case 'PlaneGeometry':

						geometry = new THREE.PlaneGeometry(
							data.width,
							data.height,
							data.widthSegments,
							data.heightSegments
						);

						break;

					case 'CubeGeometry':

						geometry = new THREE.CubeGeometry(
							data.width,
							data.height,
							data.depth,
							data.widthSegments,
							data.heightSegments,
							data.depthSegments
						);

						break;

					case 'CylinderGeometry':

						geometry = new THREE.CylinderGeometry(
							data.radiusTop,
							data.radiusBottom,
							data.height,
							data.radiusSegments,
							data.heightSegments,
							data.openEnded
						);

						break;

					case 'SphereGeometry':

						geometry = new THREE.SphereGeometry(
							data.radius,
							data.widthSegments,
							data.heightSegments,
							data.phiStart,
							data.phiLength,
							data.thetaStart,
							data.thetaLength
						);

						break;

					case 'IcosahedronGeometry':

						geometry = new THREE.IcosahedronGeometry(
							data.radius,
							data.detail
						);

						break;

					case 'TorusGeometry':

						geometry = new THREE.TorusGeometry(
							data.radius,
							data.tube,
							data.radialSegments,
							data.tubularSegments,
							data.arc
						);

						break;

					case 'TorusKnotGeometry':

						geometry = new THREE.TorusKnotGeometry(
							data.radius,
							data.tube,
							data.radialSegments,
							data.tubularSegments,
							data.p,
							data.q,
							data.heightScale
						);

						break;

					case 'Geometry':

						geometry = loader.parse( data.data ).geometry;

						break;

				}

				if ( data.id !== undefined ) geometry.id = data.id;
				if ( data.name !== undefined ) geometry.name = data.name;

				geometries[ data.id ] = geometry;

			}

		}

		return geometries;

	},

	parseMaterials: function ( json ) {

		var materials = {};

		if ( json !== undefined ) {

			var loader = new THREE.MaterialLoader();

			for ( var i = 0, l = json.length; i < l; i ++ ) {

				var data = json[ i ];
				var material = loader.parse( data );

				if ( data.id !== undefined ) material.id = data.id;
				if ( data.name !== undefined ) material.name = data.name;

				materials[ data.id ] = material;

			}

		}

		return materials;

	},

	parseObject: function ( data, geometries, materials ) {

		var object;

		switch ( data.type ) {

			case 'Scene':

				object = new THREE.Scene();

				break;

			case 'PerspectiveCamera':

				object = new THREE.PerspectiveCamera( data.fov, data.aspect, data.near, data.far );
				object.position.fromArray( data.position );
				object.rotation.fromArray( data.rotation );

				break;

			case 'OrthographicCamera':

				object = new THREE.OrthographicCamera( data.left, data.right, data.top, data.bottom, data.near, data.far );
				object.position.fromArray( data.position );
				object.rotation.fromArray( data.rotation );

				break;

			case 'AmbientLight':

				object = new THREE.AmbientLight( data.color );

				break;

			case 'DirectionalLight':

				object = new THREE.DirectionalLight( data.color, data.intensity );
				object.position.fromArray( data.position );

				break;

			case 'PointLight':

				object = new THREE.PointLight( data.color, data.intensity, data.distance );
				object.position.fromArray( data.position );

				break;

			case 'SpotLight':

				object = new THREE.SpotLight( data.color, data.intensity, data.distance, data.angle, data.exponent );
				object.position.fromArray( data.position );

				break;

			case 'HemisphereLight':

				object = new THREE.HemisphereLight( data.color, data.groundColor, data.intensity );
				object.position.fromArray( data.position );

				break;

			case 'Mesh':

				object = new THREE.Mesh( geometries[ data.geometry ], materials[ data.material ] );
				object.position.fromArray( data.position );
				object.rotation.fromArray( data.rotation );
				object.scale.fromArray( data.scale );

				break;

			default:

				object = new THREE.Object3D();
				object.position.fromArray( data.position );
				object.rotation.fromArray( data.rotation );
				object.scale.fromArray( data.scale );

		}

		if ( data.id !== undefined ) object.id = data.id;
		if ( data.name !== undefined ) object.name = data.name;
		if ( data.visible !== undefined ) object.visible = data.visible;
		if ( data.userData !== undefined ) object.userData = data.userData;

		if ( data.children !== undefined ) {

			for ( var child in data.children ) {

				object.add( this.parseObject( data.children[ child ], geometries, materials ) );

			}

		}

		return object;

	}

};