three.js/examples/js/loaders/AMFLoader.js

/*
 * @author tamarintech / https://tamarintech.com
 *
 * Description: Early release of an AMF Loader following the pattern of the
 * example loaders in the three.js project.
 *
 * More information about the AMF format: http://amf.wikispaces.com
 *
 * Usage:
 *	var loader = new AMFLoader();
 *	loader.load('/path/to/project.amf', function(objecttree) {
 *		scene.add(objecttree);
 *	});
 *
 * Materials now supported, material colors supported
 * Zip support, requires jszip
 * TextDecoder polyfill required by some browsers (particularly IE, Edge)
 * No constellation support (yet)!
 *
 */

THREE.AMFLoader = function ( manager ) {

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

};

THREE.AMFLoader.prototype = {

	constructor: THREE.AMFLoader,

	load: function ( url, onLoad, onProgress, onError ) {

		var scope = this;

		var loader = new THREE.XHRLoader( scope.manager );
		loader.setCrossOrigin( this.crossOrigin );
		loader.setResponseType( 'arraybuffer' );

		loader.load( url, function( text ) {

			var amfObject = scope.parse( text );
			onLoad( amfObject );

		}, onProgress, onError );

	},

	parse: function ( data ) {

		function loadDocument( data ) {

			var view = new DataView( data );

			var magic = String.fromCharCode( view.getUint8( 0 ), view.getUint8( 1 ) );

			if ( magic === "PK" ) {

				console.log( "Loading Zip" );
				var zip = null;
				var file = null;

				try {

					zip = new JSZip( data );

				} catch ( e ) {

					if ( e instanceof ReferenceError ) {

						console.log( "	jszip missing and file is compressed." );
						return null;

					}

				}

				for ( file in zip.files ) {

					if ( file.toLowerCase().endsWith( ".amf" ) ) {

						break;

					}

				}

				console.log( "	Trying to load file asset: " + file );
				view = new DataView( zip.file( file ).asArrayBuffer() );

			}

			if ( TextDecoder === undefined ) {

				console.log( "	TextDecoder not present.	Please use TextDecoder polyfill." );
				return null;

			}

			var filetext = new TextDecoder( 'utf-8' ).decode( view );

			var xmldata = new DOMParser().parseFromString( filetext, 'application/xml' );

			if ( xmldata.documentElement.nodeName.toLowerCase() !== "amf" ) {

				console.log( "	Error loading AMF - no AMF document found." );
				return null;

			}

			return xmldata;

		}

		function loadDocumentScale( xmldata ) {

			var scale = 1.0;

			var unit = 'millimeter';

			if ( xmldata.documentElement.attributes[ 'unit' ] !== undefined ) {

				unit = xmldata.documentElement.attributes[ 'unit' ].value.toLowerCase();

			}

			var scale_units = {
				'millimeter': 1.0,
				'inch': 25.4,
				'feet': 304.8,
				'meter': 1000.0,
				'micron': 0.001
			};

			if ( scale_units[ unit ] !== undefined ) {

				scale = scale_units[ unit ];

			}

			console.log( "	Unit scale: " + scale );
			return scale;

		}

		function loadMaterials( node ) {

			var mat = node;

			var loadedmaterial = null;
			var matname = "AMF Material";
			var matid = mat.attributes[ 'id' ].textContent;
			var color;

			for ( var i = 0; i < mat.children.length; i ++ ) {

				var matchildel = mat.children[ i ];

				if ( matchildel.nodeName === "metadata" && matchildel.attributes[ 'type' ] !== undefined ) {

					if ( matchildel.attributes[ 'type' ].value === 'name' ) {

						matname = matchildel.textContent;

					}

				} else if ( matchildel.nodeName === 'color' ) {

					color = loadColor( matchildel );

				}

			}

			loadedmaterial = new THREE.MeshPhongMaterial( {
				shading: THREE.FlatShading,
				color: new THREE.Color( color.r, color.g, color.b ),
				name: matname } );

			if ( color.opacity !== 1.0 ) {

				loadedmaterial.transparent = true;
				loadedmaterial.opacity = color.opacity;

			}

			return { 'id': matid, 'material': loadedmaterial };

		}

		function loadColor( node ) {

			var color = { 'r': 1.0, 'g': 1.0, 'b': 1.0, 'a': 1.0, opacity: 1.0 };

			for ( var i = 0; i < node.children.length; i ++ ) {

				var matcolor = node.children[ i ];

				if ( matcolor.nodeName === 'r' ) {

					color.r = matcolor.textContent;

				} else if ( matcolor.nodeName === 'g' ) {

					color.g = matcolor.textContent;

				} else if ( matcolor.nodeName === 'b' ) {

					color.b = matcolor.textContent;

				} else if ( matcolor.nodeName === 'a' ) {

					color.opacity = matcolor.textContent;

				}

			}

			return color;

		}

		function loadMeshVolume( node ) {

			var volume = { "name": "", "triangles": [], "materialid": null };

			var currvolumenode = node.firstElementChild;

			if ( node.attributes[ 'materialid' ] !== undefined ) {

				volume.materialid = node.attributes[ 'materialid' ].nodeValue;

			}

			while ( currvolumenode ) {

				if ( currvolumenode.nodeName === "metadata" ) {

					if ( currvolumenode.attributes[ 'type' ] !== undefined ) {

						if ( currvolumenode.attributes[ 'type' ].value === 'name' ) {

							volume.name = currvolumenode.textContent;

						}

					}

				} else if ( currvolumenode.nodeName === "triangle" ) {

					var trianglenode = currvolumenode.firstElementChild;

					while ( trianglenode ) {

						if ( trianglenode.nodeName === "v1" ||
								trianglenode.nodeName === "v2" ||
								trianglenode.nodeName === "v3" ) {

							volume.triangles.push( trianglenode.textContent );

						}

						trianglenode = trianglenode.nextElementSibling;

					}

				}
				currvolumenode = currvolumenode.nextElementSibling;

			}

			return volume;

		}

		function loadMeshVertices( node ) {

			var vert_array = [];

			var currverticesnode = node.firstElementChild;

			while ( currverticesnode ) {

				if ( currverticesnode.nodeName === "vertex" ) {

					var vnode = currverticesnode.firstElementChild;

					while ( vnode ) {

						if ( vnode.nodeName === "coordinates" ) {

							var coordnode = vnode.firstElementChild;

							while ( coordnode ) {

								if ( coordnode.nodeName === "x" ||
										coordnode.nodeName === "y" ||
										coordnode.nodeName === "z" ) {

									vert_array.push( coordnode.textContent );

								}

								coordnode = coordnode.nextElementSibling;

							}

						}
						vnode = vnode.nextElementSibling;

					}

				}
				currverticesnode = currverticesnode.nextElementSibling;

			}

			return vert_array;

		}

		function loadObject( node ) {

			"use strict";

			var objid = node.attributes[ 'id' ].textContent;
			var loadedobject = { "name": "amfobject", "meshes": [] };

			var currcolor = null;

			var currobjnode = node.firstElementChild;

			while ( currobjnode ) {

				if ( currobjnode.nodeName === "metadata" ) {

					if ( currobjnode.attributes[ 'type' ] !== undefined ) {

						if ( currobjnode.attributes[ 'type' ].value === 'name' ) {

							loadedobject.name = currobjnode.textContent;

						}

					}

				} else if ( currobjnode.nodeName === "color" ) {

					currcolor = loadColor( currobjnode );

				} else if ( currobjnode.nodeName === "mesh" ) {

					var currmeshnode = currobjnode.firstElementChild;
					var mesh = { "vertices": [], "volumes": [], "color": currcolor };

					while ( currmeshnode ) {

						if ( currmeshnode.nodeName === "vertices" ) {

							mesh.vertices = mesh.vertices.concat( loadMeshVertices( currmeshnode ) );

						} else if ( currmeshnode.nodeName === "volume" ) {

							mesh.volumes.push( loadMeshVolume( currmeshnode ) );

						}

						currmeshnode = currmeshnode.nextElementSibling;

					}

					loadedobject.meshes.push( mesh );

				}

				currobjnode = currobjnode.nextElementSibling;

			}

			return { 'id': objid, 'obj': loadedobject };

		}

		//

		var xmldata = loadDocument( data );

		var amfName = "";
		var amfAuthor = "";
		var amfScale = loadDocumentScale( xmldata );
		var amfMaterials = {};
		var amfObjects = {};

		var children = xmldata.documentElement.children;

		for ( var i = 0; i < children.length; i ++ ) {

			var child = children[ i ];

			if ( child.nodeName === 'metadata' ) {

				if ( child.attributes[ 'type' ] !== undefined ) {

					if ( child.attributes[ 'type' ].value === 'name' ) {

						amfName = child.textContent;

					} else if ( child.attributes[ 'type' ].value === 'author' ) {

						amfAuthor = child.textContent;

					}

				}

			} else if ( child.nodeName === 'material' ) {

				var loadedmaterial = loadMaterials( child );
				amfMaterials[ loadedmaterial.id ] = loadedmaterial.material;

			} else if ( child.nodeName === 'object' ) {

				var loadedobject = loadObject( child );
				amfObjects[ loadedobject.id ] = loadedobject.obj;

			}

		}

		var sceneobject = new THREE.Group();

		sceneobject.name = amfName;
		sceneobject.userData.author = amfAuthor;
		sceneobject.userData.loader = "AMF";

		var defaultmaterial = new THREE.MeshPhongMaterial( { color: 0xaaaaff, shading: THREE.FlatShading } );

		for ( var id in amfObjects ) {

			var meshes = amfObjects[ id ].meshes;

			var newobject = new THREE.Group();

			for ( var i = 0; i < meshes.length; i ++ ) {

				var mesh = meshes[ i ];

				var meshvertices = Float32Array.from( mesh.vertices );
				var vertices = new THREE.BufferAttribute( Float32Array.from( meshvertices ), 3 );
				var objdefaultmaterial = defaultmaterial;

				if ( mesh.color ) {

					var color = mesh.color;
					objdefaultmaterial = defaultmaterial.clone();
					objdefaultmaterial.color = new THREE.Color( color.r, color.g, color.b );

					if ( color.a !== 1.0 ) {

						objdefaultmaterial.transparent = true;
						objdefaultmaterial.opacity = color.a;

					}

				}

				var volumes = mesh.volumes;

				for ( var j = 0; j < volumes.length; j ++ ) {

					var volume = volumes[ j ];

					var newgeometry = new THREE.BufferGeometry();
					var indexes = Uint32Array.from( volume.triangles );
					var normals = new Uint32Array( vertices.array.length );

					var material = objdefaultmaterial;

					newgeometry.setIndex( new THREE.BufferAttribute( indexes, 1 ) );
					newgeometry.addAttribute( 'position', vertices.clone() );

					if ( amfMaterials[ volume.materialid ] !== undefined ) {

						material = amfMaterials[ volume.materialid ];

					}

					newgeometry.scale( amfScale, amfScale, amfScale );

					newobject.add( new THREE.Mesh( newgeometry, material.clone() ) );

				}

			}

			sceneobject.add( newobject );

		}

		return sceneobject;

	}

};