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@@ -1,8 +1,11 @@
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/**
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* @author mrdoob / http://mrdoob.com/
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* @author Alex Pletzer
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+ * @author Sagar DV / https://dvenkatsagar.github.io
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*/
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+// Work In Progress
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+// Custom VTKLoader based on the original but with extra xml polydata support
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THREE.VTKLoader = function( manager ) {
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this.manager = ( manager !== undefined ) ? manager : THREE.DefaultLoadingManager;
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@@ -528,21 +531,376 @@ THREE.VTKLoader.prototype = {
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}
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- // get the 5 first lines of the files to check if there is the key word binary
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+ function parseXML(stringFile){
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+ // Changes XML to JSON, based on https://davidwalsh.name/convert-xml-json
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+ var xmlToJson = function (xml) {
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+
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+ // Create the return object
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+ var obj = {};
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+
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+ if (xml.nodeType == 1) { // element
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+ // do attributes
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+ if (xml.attributes) {
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+ if (xml.attributes.length > 0) {
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+ obj["attributes"] = {};
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+ for (var j = 0; j < xml.attributes.length; j++) {
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+ var attribute = xml.attributes.item(j);
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+ obj["attributes"][attribute.nodeName] = attribute.nodeValue.trim();
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+ }
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+ }
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+ }
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+ } else if (xml.nodeType == 3) { // text
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+ obj = xml.nodeValue.trim();
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+ }
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- var meta = String.fromCharCode.apply( null, new Uint8Array( data, 0, 250 ) ).split( '\n' );
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+ // do children
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+ if (xml.hasChildNodes()) {
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+ for(var i = 0; i < xml.childNodes.length; i++) {
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+ var item = xml.childNodes.item(i);
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+ var nodeName = item.nodeName;
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+ if (typeof(obj[nodeName]) == "undefined") {
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+ var tmp = xmlToJson(item);
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+ if(tmp != ""){
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+ obj[nodeName] = tmp;
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+ }
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+ } else {
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+ if (typeof(obj[nodeName].push) == "undefined") {
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+ var old = obj[nodeName];
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+ obj[nodeName] = [];
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+ obj[nodeName].push(old);
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+ }
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+ var tmp = xmlToJson(item);
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+ if(tmp != ""){
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+ obj[nodeName].push(tmp);
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+ }
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+ }
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+ }
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+ }
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+ return obj;
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+ };
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+
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+ // Taken from Base64-js
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+ var Base64toByteArray = function(b64) {
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+ var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array;
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+ var i;
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+ var lookup = [];
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+ var revLookup = [];
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+ var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
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+ var len = code.length;
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+
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+ for (i = 0; i < len; i++) {
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+ lookup[i] = code[i];
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+ }
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+
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+ for (i = 0; i < len; ++i) {
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+ revLookup[code.charCodeAt(i)] = i;
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+ }
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+ revLookup['-'.charCodeAt(0)] = 62;
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+ revLookup['_'.charCodeAt(0)] = 63;
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+
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+ var j, l, tmp, placeHolders, arr;
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+ var len = b64.length;
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+
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+ if (len % 4 > 0) {
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+ throw new Error('Invalid string. Length must be a multiple of 4');
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+ }
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+
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+ placeHolders = b64[len - 2] === '=' ? 2 : b64[len - 1] === '=' ? 1 : 0;
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+ arr = new Arr(len * 3 / 4 - placeHolders);
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+ l = placeHolders > 0 ? len - 4 : len;
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+
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+ var L = 0;
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+ for (i = 0, j = 0; i < l; i += 4, j += 3) {
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+ tmp = (revLookup[b64.charCodeAt(i)] << 18) | (revLookup[b64.charCodeAt(i + 1)] << 12) | (revLookup[b64.charCodeAt(i + 2)] << 6) | revLookup[b64.charCodeAt(i + 3)];
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+ arr[L++] = (tmp & 0xFF0000) >> 16;
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+ arr[L++] = (tmp & 0xFF00) >> 8;
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+ arr[L++] = tmp & 0xFF;
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+ }
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+
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+ if (placeHolders === 2) {
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+ tmp = (revLookup[b64.charCodeAt(i)] << 2) | (revLookup[b64.charCodeAt(i + 1)] >> 4);
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+ arr[L++] = tmp & 0xFF;
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+ } else if (placeHolders === 1) {
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+ tmp = (revLookup[b64.charCodeAt(i)] << 10) | (revLookup[b64.charCodeAt(i + 1)] << 4) | (revLookup[b64.charCodeAt(i + 2)] >> 2);
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+ arr[L++] = (tmp >> 8) & 0xFF;
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+ arr[L++] = tmp & 0xFF;
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+ }
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+
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+ return arr;
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+ }
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+
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+ var parseDataArray = function(ele, compressed){
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+ // Check the format
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+ if (ele.attributes.format == "binary"){
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+ if(compressed){
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+ // Split the blob_header and compressed Data
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+ if(ele["#text"].indexOf('==') != -1){
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+ var data = ele["#text"].split("==");
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+ //console.log(data);
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+ if (data.length == 2){
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+ var blob = data.shift();
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+ var content = data.shift();
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+ if(content == ""){
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+ content = blob + "==";
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+ }
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+ }else if(data.length > 2){
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+ var blob = data.shift();
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+ var content = data.shift();
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+ content = content + "==";
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+ }else if (data.length < 2){
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+ var content = data.shift();
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+ content = content + "==";
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+ }
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+
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+ // Convert to bytearray
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+ var arr = Base64toByteArray(content);
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+ // decompress
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+ var inflate = new Zlib.Inflate(arr,{resize:true,verify:true});
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+ var content = inflate.decompress();
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+ }else{
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+ var content = Base64toByteArray(ele["#text"]);
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+ }
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+ }else{
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+ var content = Base64toByteArray(ele["#text"]);
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+ }
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+ var content = content.buffer;
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+ }else{
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+ if(ele["#text"]){
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+ var content = ele["#text"].replace(/\n/g," ").split(" ").filter(function(el,idx,arr){
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+ if(el != ""){
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+ return el;
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+ }
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+ });
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+ }else{
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+ var content = new Int32Array(0).buffer;
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+ }
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+ }
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+ delete ele["#text"];
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+ // Get the content and optimize it
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+ if(ele.attributes.type == 'Float32'){
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+ var txt = new Float32Array(content);
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+ if(ele.attributes.format == "binary"){
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+ if(!compressed){
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+ txt = txt.filter(function(el,idx,arr){if(idx != 0){return true;}});
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+ }
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+ }
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+ }else if (ele.attributes.type == 'Int64'){
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+ var txt = new Int32Array(content);
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+ if(ele.attributes.format == "binary"){
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+ if(!compressed){
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+ txt = txt.filter(function(el,idx,arr){if(idx!=0){return true;}});
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+ }
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+ txt = txt.filter(function(el,idx,arr){if(idx%2!=1){return true;}});
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+ }
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+ }
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+
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+ //console.log(txt);
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+ return txt;
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+ }
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+
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+
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+ // Main part
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+ // Get Dom
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+ var dom = null;
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+ if (window.DOMParser) {
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+ try {
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+ dom = (new DOMParser()).parseFromString(stringFile, "text/xml");
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+ }catch (e) {
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+ dom = null;
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+ }
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+ }else if (window.ActiveXObject) {
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+ try {
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+ dom = new ActiveXObject('Microsoft.XMLDOM');
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+ dom.async = false;
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+ if (!dom.loadXML(xml)){
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+ throw new Error(dom.parseError.reason + dom.parseError.srcText);
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+ }
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+ }catch (e) {
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+ dom = null;
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+ }
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+ }else{
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+ throw new Error("Cannot parse xml string!");
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+ }
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+
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+ // Get the doc
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+ var doc = dom.documentElement;
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+ // Convert to json
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+ var json = xmlToJson(doc);
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+ var points = [];
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+ var normals = [];
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+ var indices = [];
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+
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+ if(json.PolyData){
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+ var piece = json.PolyData.Piece;
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+ var compressed = json.attributes.hasOwnProperty("compressor");
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+ // Can be optimized
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+ // Loop through the sections
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+ var sections = ["PointData", "Points", "Strips", "Polys"];// +["CellData", "Verts", "Lines"];
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+ var sectionIndex = 0, numberOfSections = sections.length;
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+ while (sectionIndex < numberOfSections){
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+ var section = piece[sections[sectionIndex]];
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+ // If it has a DataArray in it
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+ if(section.DataArray){
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+ // Depending on the number of DataArrays
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+ if(Object.prototype.toString.call( section.DataArray ) === '[object Array]'){
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+ var arr = section.DataArray;
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+ }else{
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+ var arr = [section.DataArray];
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+ }
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+ var dataArrayIndex = 0, numberOfDataArrays = arr.length;
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+ while(dataArrayIndex < numberOfDataArrays){
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+ // Parse the DataArray
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+ arr[dataArrayIndex].text = parseDataArray(arr[dataArrayIndex],compressed);
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+ dataArrayIndex++;
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+ }
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- if ( meta[ 2 ].includes( 'ASCII' ) ) {
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+ switch(sections[sectionIndex]){
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+
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+ // if iti is point data
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+ case "PointData" :
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+ var numberOfPoints = parseInt(piece.attributes.NumberOfPoints);
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+ var normalsName = section.attributes.Normals;
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+ if (numberOfPoints > 0){
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+ for(var i = 0, len = arr.length; i < len; i++){
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+ if(normalsName == arr[i].attributes.Name){
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+ var components = arr[i].attributes.NumberOfComponents;
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+ normals = new Float32Array(numberOfPoints * components);
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+ normals.set(arr[i].text,0);
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+ }
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+ }
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+ }
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+ //console.log("Normals", normals);
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+ break;
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+
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+ // if it is points
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+ case "Points" :
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+ var numberOfPoints = parseInt(piece.attributes.NumberOfPoints);
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+ if (numberOfPoints > 0){
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+ var components = section.DataArray.attributes.NumberOfComponents;
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+ points = new Float32Array( numberOfPoints * components );
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+ points.set(section.DataArray.text, 0);
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+ }
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+ //console.log("Points", points);
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+ break;
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+
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+ // if it is strips
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+ case "Strips" :
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+ var numberOfStrips = parseInt(piece.attributes.NumberOfStrips);
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+ if(numberOfStrips > 0){
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+ var connectivity = new Int32Array(section.DataArray[0].text.length);
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+ var offset = new Int32Array(section.DataArray[1].text.length);
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+ connectivity.set(section.DataArray[0].text, 0);
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+ offset.set(section.DataArray[1].text, 0);
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+
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+ var size = numberOfStrips + connectivity.length;
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+ indices = new Uint32Array( 3 * size - 9 * numberOfStrips );
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+ var indicesIndex = 0;
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+ for (var i = 0,len = numberOfStrips; i < len; i++) {
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+ var strip = [];
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+ for (var s = 0,len1 = offset[i], len0 = 0; s < len1 - len0; s++) {
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+ strip.push (connectivity[s]);
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+ if(i > 0){
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+ len0 = offset[i-1];
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+ }
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+ }
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+ for (var j = 0,len1 = offset[i], len0 = 0; j < len1 - len0 - 2; j++) {
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+ if ( j % 2 ) {
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+ indices[ indicesIndex++ ] = strip[ j ];
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+ indices[ indicesIndex++ ] = strip[ j + 2 ];
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+ indices[ indicesIndex++ ] = strip[ j + 1 ];
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+ }else{
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+ indices[ indicesIndex++ ] = strip[ j ];
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+ indices[ indicesIndex++ ] = strip[ j + 1 ];
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+ indices[ indicesIndex++ ] = strip[ j + 2 ];
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+ }
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+ if(i > 0){
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+ len0 = offset[i-1];
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+ }
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+ }
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+ }
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+ }
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+ //console.log("Strips", indices);
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+ break;
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+
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+ // if it is polys
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+ case "Polys" :
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+ var numberOfPolys = parseInt(piece.attributes.NumberOfPolys);
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+ if(numberOfPolys > 0){
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+ var connectivity = new Int32Array(section.DataArray[0].text.length);
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+ var offset = new Int32Array(section.DataArray[1].text.length);
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+ connectivity.set(section.DataArray[0].text, 0);
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+ offset.set(section.DataArray[1].text, 0);
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+
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+ var size = numberOfPolys + connectivity.length;
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+ indices = new Uint32Array( 3 * size - 9 * numberOfPolys );
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+ var indicesIndex = 0, connectivityIndex = 0;
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+ var i = 0,len = numberOfPolys, len0 = 0;
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+ while(i < len){
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+ var poly = [];
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+ var s = 0, len1 = offset[i];
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+ while(s < len1 - len0){
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+ poly.push (connectivity[connectivityIndex++]);
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+ s++;
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+ }
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+ var j = 1;
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+ while(j < len1 - len0 - 1){
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+ indices[ indicesIndex++ ] = poly[ 0 ];
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+ indices[ indicesIndex++ ] = poly[ j ];
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+ indices[ indicesIndex++ ] = poly[ j + 1 ];
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+ j++;
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+ }
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+ i++;
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+ len0 = offset[i-1];
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+ }
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+ }
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+ //console.log("Polys", indices);
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+ break;
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+ default :
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+ break;
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+ }
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+ }
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+ sectionIndex++;
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+ }
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+
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+ var geometry = new THREE.BufferGeometry();
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+ geometry.setIndex( new THREE.BufferAttribute( indices, 1 ) );
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+ geometry.addAttribute( 'position', new THREE.BufferAttribute( points, 3 ) );
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+
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+ if ( normals.length == points.length ) {
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+
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+ geometry.addAttribute( 'normal', new THREE.BufferAttribute( normals, 3 ) );
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+
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+ }
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+ //console.log(json);
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+ return geometry;
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+ }else{
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+ /* TODO for vtu,vti,and other xml formats*/
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+ }
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+ }
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+
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+ function getStringFile(data){
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var stringFile = '';
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var charArray = new Uint8Array( data );
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- for ( var i = 0; i < charArray.length; i ++ ) {
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+ var i = 0;
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+ var len = charArray.length;
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+ while(len--){
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+ stringFile += String.fromCharCode( charArray[ i++ ] );
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+ }
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+ return stringFile;
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+ }
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- stringFile += String.fromCharCode( charArray[ i ] );
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+ // get the 5 first lines of the files to check if there is the key word binary
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+ var meta = String.fromCharCode.apply( null, new Uint8Array( data, 0, 250 ) ).split( '\n' );
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+ if (meta[0].indexOf("xml") != -1){
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- }
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+ var stringFile = getStringFile(data);
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+ return parseXML(stringFile);
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+
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+ }else if ( meta[ 2 ].includes( 'ASCII' ) ) {
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+ var stringFile = getStringFile(data);
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return parseASCII( stringFile );
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} else {
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Sagar Dwibhashyam