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389 lines
11 KiB
389 lines
11 KiB
/**
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* @author aleeper / http://adamleeper.com/
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* @author mrdoob / http://mrdoob.com/
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* @author gero3 / https://github.com/gero3
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*
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* Description: A THREE loader for STL ASCII files, as created by Solidworks and other CAD programs.
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*
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* Supports both binary and ASCII encoded files, with automatic detection of type.
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*
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* Limitations:
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* Binary decoding ignores header. There doesn't seem to be much of a use for it.
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* There is perhaps some question as to how valid it is to always assume little-endian-ness.
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* ASCII decoding assumes file is UTF-8. Seems to work for the examples...
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*
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* Usage:
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* var loader = new THREE.STLLoader();
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* loader.addEventListener( 'load', function ( event ) {
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*
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* var geometry = event.content;
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* scene.add( new THREE.Mesh( geometry ) );
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*
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* } );
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* loader.load( './models/stl/slotted_disk.stl' );
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*/
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THREE.STLLoader = function () {};
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THREE.STLLoader.prototype = {
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constructor: THREE.STLLoader,
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addEventListener: THREE.EventDispatcher.prototype.addEventListener,
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hasEventListener: THREE.EventDispatcher.prototype.hasEventListener,
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removeEventListener: THREE.EventDispatcher.prototype.removeEventListener,
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dispatchEvent: THREE.EventDispatcher.prototype.dispatchEvent
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};
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THREE.STLLoader.prototype.load = function (url, callback) {
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var scope = this;
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var xhr = new XMLHttpRequest();
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function onloaded( event ) {
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if ( event.target.status === 200 || event.target.status === 0 ) {
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var geometry = scope.parse( event.target.response || event.target.responseText );
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scope.dispatchEvent( { type: 'load', content: geometry } );
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if ( callback ) callback( geometry );
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} else {
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scope.dispatchEvent( { type: 'error', message: 'Couldn\'t load URL [' + url + ']',
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response: event.target.responseText } );
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}
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}
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xhr.addEventListener( 'load', onloaded, false );
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xhr.addEventListener( 'progress', function ( event ) {
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scope.dispatchEvent( { type: 'progress', loaded: event.loaded, total: event.total } );
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}, false );
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xhr.addEventListener( 'error', function () {
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scope.dispatchEvent( { type: 'error', message: 'Couldn\'t load URL [' + url + ']' } );
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}, false );
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xhr.overrideMimeType('text/plain; charset=x-user-defined');
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xhr.open( 'GET', url, true );
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xhr.responseType = "arraybuffer";
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xhr.send( null );
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};
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THREE.STLLoader.prototype.parse = function (data) {
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var isBinary = function () {
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var expect, face_size, n_faces, reader;
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reader = new DataView( binData );
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face_size = (32 / 8 * 3) + ((32 / 8 * 3) * 3) + (16 / 8);
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n_faces = reader.getUint32(80,true);
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expect = 80 + (32 / 8) + (n_faces * face_size);
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return expect === reader.byteLength;
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};
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var binData = this.ensureBinary( data );
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return isBinary()
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? this.parseBinary( binData )
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: this.parseASCII( this.ensureString( data ) );
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};
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THREE.STLLoader.prototype.parseBinary = function (data) {
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var face, geometry, n_faces, reader, length, normal, i, dataOffset, faceLength, start, vertexstart;
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reader = new DataView( data );
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n_faces = reader.getUint32(80,true);
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geometry = new THREE.Geometry();
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dataOffset = 84;
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faceLength = 12 * 4 + 2;
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for (face = 0; face < n_faces; face++) {
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start = dataOffset + face * faceLength;
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normal = new THREE.Vector3(
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reader.getFloat32(start,true),
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reader.getFloat32(start + 4,true),
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reader.getFloat32(start + 8,true)
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);
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for (i = 1; i <= 3; i++) {
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vertexstart = start + i * 12;
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geometry.vertices.push(
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new THREE.Vector3(
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reader.getFloat32(vertexstart,true),
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reader.getFloat32(vertexstart +4,true),
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reader.getFloat32(vertexstart + 8,true)
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)
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);
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}
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length = geometry.vertices.length;
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geometry.faces.push(new THREE.Face3(length - 3, length - 2, length - 1, normal));
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}
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//geometry.computeCentroids();
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geometry.computeBoundingSphere();
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return geometry;
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};
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THREE.STLLoader.prototype.parseASCII = function (data) {
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var geometry, length, normal, patternFace, patternNormal, patternVertex, result, text;
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geometry = new THREE.Geometry();
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patternFace = /facet([\s\S]*?)endfacet/g;
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while (((result = patternFace.exec(data)) != null)) {
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text = result[0];
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patternNormal = /normal[\s]+([\-+]?[0-9]+\.?[0-9]*([eE][\-+]?[0-9]+)?)+[\s]+([\-+]?[0-9]*\.?[0-9]+([eE][\-+]?[0-9]+)?)+[\s]+([\-+]?[0-9]*\.?[0-9]+([eE][\-+]?[0-9]+)?)+/g;
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while (((result = patternNormal.exec(text)) != null)) {
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normal = new THREE.Vector3(parseFloat(result[1]), parseFloat(result[3]), parseFloat(result[5]));
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}
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patternVertex = /vertex[\s]+([\-+]?[0-9]+\.?[0-9]*([eE][\-+]?[0-9]+)?)+[\s]+([\-+]?[0-9]*\.?[0-9]+([eE][\-+]?[0-9]+)?)+[\s]+([\-+]?[0-9]*\.?[0-9]+([eE][\-+]?[0-9]+)?)+/g;
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while (((result = patternVertex.exec(text)) != null)) {
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geometry.vertices.push(new THREE.Vector3(parseFloat(result[1]), parseFloat(result[3]), parseFloat(result[5])));
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}
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length = geometry.vertices.length;
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geometry.faces.push(new THREE.Face3(length - 3, length - 2, length - 1, normal));
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}
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geometry.computeCentroids();
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geometry.computeBoundingBox();
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geometry.computeBoundingSphere();
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return geometry;
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};
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THREE.STLLoader.prototype.ensureString = function (buf) {
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if (typeof buf !== "string"){
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var array_buffer = new Uint8Array(buf);
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var str = '';
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for(var i = 0; i < buf.byteLength; i++) {
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str += String.fromCharCode(array_buffer[i]); // implicitly assumes little-endian
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}
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return str;
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} else {
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return buf;
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}
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};
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THREE.STLLoader.prototype.ensureBinary = function (buf) {
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if (typeof buf === "string"){
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var array_buffer = new Uint8Array(buf.length);
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for(var i = 0; i < buf.length; i++) {
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array_buffer[i] = buf.charCodeAt(i) & 0xff; // implicitly assumes little-endian
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}
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return array_buffer.buffer || array_buffer;
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} else {
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return buf;
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}
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};
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if ( typeof DataView === 'undefined'){
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DataView = function(buffer, byteOffset, byteLength){
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this.buffer = buffer;
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this.byteOffset = byteOffset || 0;
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this.byteLength = byteLength || buffer.byteLength || buffer.length;
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this._isString = typeof buffer === "string";
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}
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DataView.prototype = {
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_getCharCodes:function(buffer,start,length){
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start = start || 0;
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length = length || buffer.length;
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var end = start + length;
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var codes = [];
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for (var i = start; i < end; i++) {
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codes.push(buffer.charCodeAt(i) & 0xff);
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}
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return codes;
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},
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_getBytes: function (length, byteOffset, littleEndian) {
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var result;
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// Handle the lack of endianness
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if (littleEndian === undefined) {
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littleEndian = this._littleEndian;
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}
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// Handle the lack of byteOffset
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if (byteOffset === undefined) {
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byteOffset = this.byteOffset;
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} else {
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byteOffset = this.byteOffset + byteOffset;
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}
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if (length === undefined) {
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length = this.byteLength - byteOffset;
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}
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// Error Checking
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if (typeof byteOffset !== 'number') {
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throw new TypeError('DataView byteOffset is not a number');
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}
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if (length < 0 || byteOffset + length > this.byteLength) {
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throw new Error('DataView length or (byteOffset+length) value is out of bounds');
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}
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if (this.isString){
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result = this._getCharCodes(this.buffer, byteOffset, byteOffset + length);
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} else {
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result = this.buffer.slice(byteOffset, byteOffset + length);
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}
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if (!littleEndian && length > 1) {
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if (!(result instanceof Array)) {
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result = Array.prototype.slice.call(result);
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}
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result.reverse();
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}
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return result;
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},
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// Compatibility functions on a String Buffer
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getFloat64: function (byteOffset, littleEndian) {
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var b = this._getBytes(8, byteOffset, littleEndian),
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sign = 1 - (2 * (b[7] >> 7)),
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exponent = ((((b[7] << 1) & 0xff) << 3) | (b[6] >> 4)) - ((1 << 10) - 1),
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// Binary operators such as | and << operate on 32 bit values, using + and Math.pow(2) instead
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mantissa = ((b[6] & 0x0f) * Math.pow(2, 48)) + (b[5] * Math.pow(2, 40)) + (b[4] * Math.pow(2, 32)) +
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(b[3] * Math.pow(2, 24)) + (b[2] * Math.pow(2, 16)) + (b[1] * Math.pow(2, 8)) + b[0];
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if (exponent === 1024) {
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if (mantissa !== 0) {
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return NaN;
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} else {
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return sign * Infinity;
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}
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}
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if (exponent === -1023) { // Denormalized
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return sign * mantissa * Math.pow(2, -1022 - 52);
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}
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return sign * (1 + mantissa * Math.pow(2, -52)) * Math.pow(2, exponent);
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},
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getFloat32: function (byteOffset, littleEndian) {
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var b = this._getBytes(4, byteOffset, littleEndian),
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sign = 1 - (2 * (b[3] >> 7)),
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exponent = (((b[3] << 1) & 0xff) | (b[2] >> 7)) - 127,
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mantissa = ((b[2] & 0x7f) << 16) | (b[1] << 8) | b[0];
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if (exponent === 128) {
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if (mantissa !== 0) {
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return NaN;
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} else {
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return sign * Infinity;
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}
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}
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if (exponent === -127) { // Denormalized
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return sign * mantissa * Math.pow(2, -126 - 23);
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}
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return sign * (1 + mantissa * Math.pow(2, -23)) * Math.pow(2, exponent);
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},
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getInt32: function (byteOffset, littleEndian) {
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var b = this._getBytes(4, byteOffset, littleEndian);
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return (b[3] << 24) | (b[2] << 16) | (b[1] << 8) | b[0];
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},
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getUint32: function (byteOffset, littleEndian) {
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return this.getInt32(byteOffset, littleEndian) >>> 0;
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},
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getInt16: function (byteOffset, littleEndian) {
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return (this.getUint16(byteOffset, littleEndian) << 16) >> 16;
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},
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getUint16: function (byteOffset, littleEndian) {
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var b = this._getBytes(2, byteOffset, littleEndian);
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return (b[1] << 8) | b[0];
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},
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getInt8: function (byteOffset) {
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return (this.getUint8(byteOffset) << 24) >> 24;
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},
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getUint8: function (byteOffset) {
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return this._getBytes(1, byteOffset)[0];
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}
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};
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}
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