three.js/examples/js/loaders/VTKLoader.js

/**
 * @author mrdoob / http://mrdoob.com/
 * @author Alex Pletzer
 * @author Sagar DV / https://dvenkatsagar.github.io
 */

// Work In Progress
// Custom VTKLoader based on the original but with extra xml polydata support
THREE.VTKLoader = function( manager ) {

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

};

THREE.VTKLoader.prototype = {

	constructor: THREE.VTKLoader,

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

		var scope = this;

		var loader = new THREE.XHRLoader( scope.manager );
		loader.setResponseType( 'arraybuffer' );
		loader.load( url, function( text ) {

			onLoad( scope.parse( text ) );

		}, onProgress, onError );

	},

	parse: function ( data ) {

		function parseASCII( data ) {

			// connectivity of the triangles
			var indices = [];

			// triangles vertices
			var positions = [];

			// red, green, blue colors in the range 0 to 1
			var colors = [];

			// normal vector, one per vertex
			var normals = [];

			var result;

			// pattern for reading vertices, 3 floats or integers
			var pat3Floats = /(\-?\d+\.?[\d\-\+e]*)\s+(\-?\d+\.?[\d\-\+e]*)\s+(\-?\d+\.?[\d\-\+e]*)/g;

			// pattern for connectivity, an integer followed by any number of ints
			// the first integer is the number of polygon nodes
			var patConnectivity = /^(\d+)\s+([\s\d]*)/;

			// indicates start of vertex data section
			var patPOINTS = /^POINTS /;

			// indicates start of polygon connectivity section
			var patPOLYGONS = /^POLYGONS /;

			// indicates start of triangle strips section
			var patTRIANGLE_STRIPS = /^TRIANGLE_STRIPS /;

			// POINT_DATA number_of_values
			var patPOINT_DATA = /^POINT_DATA[ ]+(\d+)/;

			// CELL_DATA number_of_polys
			var patCELL_DATA = /^CELL_DATA[ ]+(\d+)/;

			// Start of color section
			var patCOLOR_SCALARS = /^COLOR_SCALARS[ ]+(\w+)[ ]+3/;

			// NORMALS Normals float
			var patNORMALS = /^NORMALS[ ]+(\w+)[ ]+(\w+)/;

			var inPointsSection = false;
			var inPolygonsSection = false;
			var inTriangleStripSection = false;
			var inPointDataSection = false;
			var inCellDataSection = false;
			var inColorSection = false;
			var inNormalsSection = false;

			var lines = data.split( '\n' );

			for ( var i in lines ) {

				var line = lines[ i ];

				if ( inPointsSection ) {

					// get the vertices
					while ( ( result = pat3Floats.exec( line ) ) !== null ) {

						var x = parseFloat( result[ 1 ] );
						var y = parseFloat( result[ 2 ] );
						var z = parseFloat( result[ 3 ] );
						positions.push( x, y, z );

					}

				} else if ( inPolygonsSection ) {

					if ( ( result = patConnectivity.exec( line ) ) !== null ) {

						// numVertices i0 i1 i2 ...
						var numVertices = parseInt( result[ 1 ] );
						var inds = result[ 2 ].split( /\s+/ );

						if ( numVertices >= 3 ) {

							var i0 = parseInt( inds[ 0 ] );
							var i1, i2;
							var k = 1;
							// split the polygon in numVertices - 2 triangles
							for ( var j = 0; j < numVertices - 2; ++ j ) {

								i1 = parseInt( inds[ k ] );
								i2 = parseInt( inds[ k + 1 ] );
								indices.push( i0, i1, i2 );
								k ++;

							}

						}

					}

				} else if ( inTriangleStripSection ) {

					if ( ( result = patConnectivity.exec( line ) ) !== null ) {

						// numVertices i0 i1 i2 ...
						var numVertices = parseInt( result[ 1 ] );
						var inds = result[ 2 ].split( /\s+/ );

						if ( numVertices >= 3 ) {

							var i0, i1, i2;
							// split the polygon in numVertices - 2 triangles
							for ( var j = 0; j < numVertices - 2; j ++ ) {

								if ( j % 2 === 1 ) {

									i0 = parseInt( inds[ j ] );
									i1 = parseInt( inds[ j + 2 ] );
									i2 = parseInt( inds[ j + 1 ] );
									indices.push( i0, i1, i2 );

								} else {

									i0 = parseInt( inds[ j ] );
									i1 = parseInt( inds[ j + 1 ] );
									i2 = parseInt( inds[ j + 2 ] );
									indices.push( i0, i1, i2 );

								}

							}

						}

					}

				} else if ( inPointDataSection || inCellDataSection ) {

					if ( inColorSection ) {

						// Get the colors

						while ( ( result = pat3Floats.exec( line ) ) !== null ) {

							var r = parseFloat( result[ 1 ] );
							var g = parseFloat( result[ 2 ] );
							var b = parseFloat( result[ 3 ] );
							colors.push( r, g, b );

						}

					} else if ( inNormalsSection ) {

						// Get the normal vectors

						while ( ( result = pat3Floats.exec( line ) ) !== null ) {

							var nx = parseFloat( result[ 1 ] );
							var ny = parseFloat( result[ 2 ] );
							var nz = parseFloat( result[ 3 ] );
							normals.push( nx, ny, nz );

						}

					}

				}

				if ( patPOLYGONS.exec( line ) !== null ) {

					inPolygonsSection = true;
					inPointsSection = false;
					inTriangleStripSection = false;

				} else if ( patPOINTS.exec( line ) !== null ) {

					inPolygonsSection = false;
					inPointsSection = true;
					inTriangleStripSection = false;

				} else if ( patTRIANGLE_STRIPS.exec( line ) !== null ) {

					inPolygonsSection = false;
					inPointsSection = false;
					inTriangleStripSection = true;

				} else if ( patPOINT_DATA.exec( line ) !== null ) {

					inPointDataSection = true;
					inPointsSection = false;
					inPolygonsSection = false;
					inTriangleStripSection = false;

				} else if ( patCELL_DATA.exec( line ) !== null ) {

					inCellDataSection = true;
					inPointsSection = false;
					inPolygonsSection = false;
					inTriangleStripSection = false;

				} else if ( patCOLOR_SCALARS.exec( line ) !== null ) {

					inColorSection = true;
					inNormalsSection = false;
					inPointsSection = false;
					inPolygonsSection = false;
					inTriangleStripSection = false;

				} else if ( patNORMALS.exec( line ) !== null ) {

					inNormalsSection = true;
					inColorSection = false;
					inPointsSection = false;
					inPolygonsSection = false;
					inTriangleStripSection = false;

				}

			}

			var geometry;
			var stagger = 'point';

			if ( colors.length == indices.length ) {

				stagger = 'cell';

			}

			if ( stagger == 'point' ) {

				// Nodal. Use BufferGeometry
				geometry = new THREE.BufferGeometry();
				geometry.setIndex( new THREE.BufferAttribute( new Uint32Array( indices ), 1 ) );
				geometry.addAttribute( 'position', new THREE.BufferAttribute( new Float32Array( positions ), 3 ) );

				if ( colors.length == positions.length ) {

					geometry.addAttribute( 'color', new THREE.BufferAttribute( new Float32Array( colors ), 3 ) );

				}

				if ( normals.length == positions.length ) {

					geometry.addAttribute( 'normal', new THREE.BufferAttribute( new Float32Array( normals ), 3 ) );

				}

			} else {

				// Cell centered colors. The only way to attach a solid color to each triangle
				// is to use Geometry, which is less efficient than BufferGeometry
				geometry = new THREE.Geometry();

				var numTriangles = indices.length / 3;
				var numPoints = positions.length / 3;
				var va, vb, vc;
				var face;
				var ia, ib, ic;
				var x, y, z;
				var r, g, b;

				for ( var j = 0; j < numPoints; ++ j ) {

					x = positions[ 3 * j + 0 ];
					y = positions[ 3 * j + 1 ];
					z = positions[ 3 * j + 2 ];
					geometry.vertices.push( new THREE.Vector3( x, y, z ) );

				}

				for ( var i = 0; i < numTriangles; ++ i ) {

					ia = indices[ 3 * i + 0 ];
					ib = indices[ 3 * i + 1 ];
					ic = indices[ 3 * i + 2 ];
					geometry.faces.push( new THREE.Face3( ia, ib, ic ) );

				}

				if ( colors.length == numTriangles * 3 ) {

					for ( var i = 0; i < numTriangles; ++ i ) {

						face = geometry.faces[ i ];
						r = colors[ 3 * i + 0 ];
						g = colors[ 3 * i + 1 ];
						b = colors[ 3 * i + 2 ];
						face.color = new THREE.Color().setRGB( r, g, b );

					}

				}

			}

			return geometry;

		}

		function parseBinary( data ) {

			var count, pointIndex, i, numberOfPoints, pt, s;
			var buffer = new Uint8Array ( data );
			var dataView = new DataView ( data );

			// Points and normals, by default, are empty
			var points = [];
			var normals = [];
			var indices = [];

			// Going to make a big array of strings
			var vtk = [];
			var index = 0;

			function findString( buffer, start ) {

				var index = start;
				var c = buffer[ index ];
				var s = [];
				while ( c != 10 ) {

					s.push ( String.fromCharCode ( c ) );
					index ++;
					c = buffer[ index ];

				}

				return { start: start,
						end: index,
						next: index + 1,
						parsedString: s.join( '' ) };

			}

			var state, line;

			while ( true ) {

				// Get a string
				state = findString ( buffer, index );
				line = state.parsedString;

				if ( line.indexOf ( "POINTS" ) === 0 ) {

					vtk.push ( line );
					// Add the points
					numberOfPoints = parseInt ( line.split( " " )[ 1 ], 10 );

					// Each point is 3 4-byte floats
					count = numberOfPoints * 4 * 3;

					points = new Float32Array( numberOfPoints * 3 );

					pointIndex = state.next;
					for ( i = 0; i < numberOfPoints; i ++ ) {

						points[ 3 * i ] = dataView.getFloat32( pointIndex, false );
						points[ 3 * i + 1 ] = dataView.getFloat32( pointIndex + 4, false );
						points[ 3 * i + 2 ] = dataView.getFloat32( pointIndex + 8, false );
						pointIndex = pointIndex + 12;

					}
					// increment our next pointer
					state.next = state.next + count + 1;

				} else if ( line.indexOf ( "TRIANGLE_STRIPS" ) === 0 ) {

					var numberOfStrips = parseInt ( line.split( " " )[ 1 ], 10 );
					var size = parseInt ( line.split ( " " )[ 2 ], 10 );
					// 4 byte integers
					count = size * 4;

					indices = new Uint32Array( 3 * size - 9 * numberOfStrips );
					var indicesIndex = 0;

					pointIndex = state.next;
					for ( i = 0; i < numberOfStrips; i ++ ) {

						// For each strip, read the first value, then record that many more points
						var indexCount = dataView.getInt32( pointIndex, false );
						var strip = [];
						pointIndex += 4;
						for ( s = 0; s < indexCount; s ++ ) {

							strip.push ( dataView.getInt32( pointIndex, false ) );
							pointIndex += 4;

						}

						// retrieves the n-2 triangles from the triangle strip
						for ( var j = 0; j < indexCount - 2; j ++ ) {

							if ( j % 2 ) {

								indices[ indicesIndex ++ ] = strip[ j ];
								indices[ indicesIndex ++ ] = strip[ j + 2 ];
								indices[ indicesIndex ++ ] = strip[ j + 1 ];

							} else {


								indices[ indicesIndex ++ ] = strip[ j ];
								indices[ indicesIndex ++ ] = strip[ j + 1 ];
								indices[ indicesIndex ++ ] = strip[ j + 2 ];

							}

						}

					}
					// increment our next pointer
					state.next = state.next + count + 1;

				} else if ( line.indexOf ( "POLYGONS" ) === 0 ) {

					var numberOfStrips = parseInt ( line.split( " " )[ 1 ], 10 );
					var size = parseInt ( line.split ( " " )[ 2 ], 10 );
					// 4 byte integers
					count = size * 4;

					indices = new Uint32Array( 3 * size - 9 * numberOfStrips );
					var indicesIndex = 0;

					pointIndex = state.next;
					for ( i = 0; i < numberOfStrips; i ++ ) {

						// For each strip, read the first value, then record that many more points
						var indexCount = dataView.getInt32( pointIndex, false );
						var strip = [];
						pointIndex += 4;
						for ( s = 0; s < indexCount; s ++ ) {

							strip.push ( dataView.getInt32( pointIndex, false ) );
							pointIndex += 4;

						}
						var i0 = strip[ 0 ];
						// divide the polygon in n-2 triangle
						for ( var j = 1; j < indexCount - 1; j ++ ) {

							indices[ indicesIndex ++ ] = strip[ 0 ];
							indices[ indicesIndex ++ ] = strip[ j ];
							indices[ indicesIndex ++ ] = strip[ j + 1 ];

						}

					}
					// increment our next pointer
					state.next = state.next + count + 1;

				} else if ( line.indexOf ( "POINT_DATA" ) === 0 ) {

					numberOfPoints = parseInt ( line.split( " " )[ 1 ], 10 );

					// Grab the next line
					state = findString ( buffer, state.next );

					// Now grab the binary data
					count = numberOfPoints * 4 * 3;

					normals = new Float32Array( numberOfPoints * 3 );
					pointIndex = state.next;
					for ( i = 0; i < numberOfPoints; i ++ ) {

						normals[ 3 * i ] = dataView.getFloat32( pointIndex, false );
						normals[ 3 * i + 1 ] = dataView.getFloat32( pointIndex + 4, false );
						normals[ 3 * i + 2 ] = dataView.getFloat32( pointIndex + 8, false );
						pointIndex += 12;

					}

					// Increment past our data
					state.next = state.next + count;

				}

				// Increment index
				index = state.next;

				if ( index >= buffer.byteLength ) {

					break;

				}

			}

			var geometry = new THREE.BufferGeometry();
			geometry.setIndex( new THREE.BufferAttribute( indices, 1 ) );
			geometry.addAttribute( 'position', new THREE.BufferAttribute( points, 3 ) );

			if ( normals.length == points.length ) {

				geometry.addAttribute( 'normal', new THREE.BufferAttribute( normals, 3 ) );

			}

			return geometry;

		}

		function parseXML(stringFile){
			// Changes XML to JSON, based on https://davidwalsh.name/convert-xml-json
			var xmlToJson = function (xml) {

				// Create the return object
				var obj = {};

				if (xml.nodeType == 1) { // element
					// do attributes
					if (xml.attributes) {
						if (xml.attributes.length > 0) {
						obj["attributes"] = {};
							for (var j = 0; j < xml.attributes.length; j++) {
								var attribute = xml.attributes.item(j);
								obj["attributes"][attribute.nodeName] = attribute.nodeValue.trim();
							}
						}
					}
				} else if (xml.nodeType == 3) { // text
					obj = xml.nodeValue.trim();
				}

				// do children
			 	if (xml.hasChildNodes()) {
					for(var i = 0; i < xml.childNodes.length; i++) {
						var item = xml.childNodes.item(i);
						var nodeName = item.nodeName;
						if (typeof(obj[nodeName]) == "undefined") {
							var tmp = xmlToJson(item);
							if(tmp != ""){
								obj[nodeName] = tmp;
							}
						} else {
							if (typeof(obj[nodeName].push) == "undefined") {
								var old = obj[nodeName];
								obj[nodeName] = [];
								obj[nodeName].push(old);
							}
							var tmp = xmlToJson(item);
							if(tmp != ""){
								obj[nodeName].push(tmp);
							}
						}
					}
				}
				return obj;
			};

			// Taken from Base64-js
			var Base64toByteArray = function(b64) {
					var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array;
					var i;
					var lookup = [];
					var revLookup = [];
				  var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
				  var len = code.length;

				  for (i = 0; i < len; i++) {
				    lookup[i] = code[i];
				  }

				  for (i = 0; i < len; ++i) {
				    revLookup[code.charCodeAt(i)] = i;
				  }
				  revLookup['-'.charCodeAt(0)] = 62;
				  revLookup['_'.charCodeAt(0)] = 63;

				  var j, l, tmp, placeHolders, arr;
				  var len = b64.length;

				  if (len % 4 > 0) {
				    throw new Error('Invalid string. Length must be a multiple of 4');
				  }

				  placeHolders = b64[len - 2] === '=' ? 2 : b64[len - 1] === '=' ? 1 : 0;
				  arr = new Arr(len * 3 / 4 - placeHolders);
				  l = placeHolders > 0 ? len - 4 : len;

					var L = 0;
				  for (i = 0, j = 0; i < l; i += 4, j += 3) {
				    tmp = (revLookup[b64.charCodeAt(i)] << 18) | (revLookup[b64.charCodeAt(i + 1)] << 12) | (revLookup[b64.charCodeAt(i + 2)] << 6) | revLookup[b64.charCodeAt(i + 3)];
				    arr[L++] = (tmp & 0xFF0000) >> 16;
				    arr[L++] = (tmp & 0xFF00) >> 8;
				    arr[L++] = tmp & 0xFF;
				  }

				  if (placeHolders === 2) {
				    tmp = (revLookup[b64.charCodeAt(i)] << 2) | (revLookup[b64.charCodeAt(i + 1)] >> 4);
				    arr[L++] = tmp & 0xFF;
				  } else if (placeHolders === 1) {
				    tmp = (revLookup[b64.charCodeAt(i)] << 10) | (revLookup[b64.charCodeAt(i + 1)] << 4) | (revLookup[b64.charCodeAt(i + 2)] >> 2);
				    arr[L++] = (tmp >> 8) & 0xFF;
				    arr[L++] = tmp & 0xFF;
				  }

				  return arr;
				}

				var parseDataArray = function(ele, compressed){
					// Check the format
					if (ele.attributes.format == "binary"){
						if(compressed){
							// Split the blob_header and compressed Data
							if(ele["#text"].indexOf('==') != -1){
								var data = ele["#text"].split("==");
								//console.log(data);
								if (data.length == 2){
									var blob = data.shift();
									var content = data.shift();
									if(content == ""){
										content = blob + "==";
									}
								}else if(data.length > 2){
									var blob = data.shift();
									var content = data.shift();
									content = content + "==";
								}else if (data.length < 2){
									var content = data.shift();
									content = content + "==";
								}

								// Convert to bytearray
								var arr = Base64toByteArray(content);
								// decompress
								var inflate = new Zlib.Inflate(arr,{resize:true,verify:true});
								var content = inflate.decompress();
							}else{
								var content = Base64toByteArray(ele["#text"]);
							}
						}else{
							var content = Base64toByteArray(ele["#text"]);
						}
						var content = content.buffer;
					}else{
						if(ele["#text"]){
							var content = ele["#text"].replace(/\n/g," ").split(" ").filter(function(el,idx,arr){
								if(el != ""){
									return el;
								}
							});
						}else{
							var content = new Int32Array(0).buffer;
						}
					}
					delete ele["#text"];
					// Get the content and optimize it
					if(ele.attributes.type == 'Float32'){
						var txt = new Float32Array(content);
						if(ele.attributes.format == "binary"){
							if(!compressed){
								txt = txt.filter(function(el,idx,arr){if(idx != 0){return true;}});
							}
						}
					}else if (ele.attributes.type == 'Int64'){
						var txt = new Int32Array(content);
						if(ele.attributes.format == "binary"){
							if(!compressed){
								txt = txt.filter(function(el,idx,arr){if(idx!=0){return true;}});
							}
							txt = txt.filter(function(el,idx,arr){if(idx%2!=1){return true;}});
						}
					}

					//console.log(txt);
					return txt;
				}


			// Main part
			// Get Dom
			var dom = null;
			if (window.DOMParser) {
				try {
						dom = (new DOMParser()).parseFromString(stringFile, "text/xml");
				}catch (e) {
					dom = null;
				}
			}else if (window.ActiveXObject) {
				try {
						dom = new ActiveXObject('Microsoft.XMLDOM');
						dom.async = false;
						if (!dom.loadXML(xml)){
							throw new Error(dom.parseError.reason + dom.parseError.srcText);
						}
				}catch (e) {
					dom = null;
				}
			}else{
				 throw new Error("Cannot parse xml string!");
			}

			// Get the doc
			var doc = dom.documentElement;
			// Convert to json
			var json = xmlToJson(doc);
			var points = [];
			var normals = [];
			var indices = [];

			if(json.PolyData){
				var piece = json.PolyData.Piece;
				var compressed = json.attributes.hasOwnProperty("compressor");
				// Can be optimized
				// Loop through the sections
				var sections = ["PointData", "Points", "Strips", "Polys"];// +["CellData", "Verts", "Lines"];
				var sectionIndex = 0, numberOfSections = sections.length;
				while (sectionIndex < numberOfSections){
					var section = piece[sections[sectionIndex]];
					// If it has a DataArray in it
					if(section.DataArray){
						// Depending on the number of DataArrays
						if(Object.prototype.toString.call( section.DataArray ) === '[object Array]'){
							var arr = section.DataArray;
						}else{
							var arr = [section.DataArray];
						}

						var dataArrayIndex = 0, numberOfDataArrays = arr.length;
						while(dataArrayIndex < numberOfDataArrays){
							// Parse the DataArray
							arr[dataArrayIndex].text = parseDataArray(arr[dataArrayIndex],compressed);
							dataArrayIndex++;
						}

						switch(sections[sectionIndex]){

							// if iti is point data
							case "PointData" :
								var numberOfPoints = parseInt(piece.attributes.NumberOfPoints);
								var normalsName = section.attributes.Normals;
								if (numberOfPoints > 0){
									for(var i = 0, len = arr.length; i < len; i++){
										if(normalsName == arr[i].attributes.Name){
											var components = arr[i].attributes.NumberOfComponents;
											normals = new Float32Array(numberOfPoints * components);
											normals.set(arr[i].text,0);
										}
									}
								}
								//console.log("Normals", normals);
								break;

							// if it is points
							case "Points" :
								var numberOfPoints = parseInt(piece.attributes.NumberOfPoints);
								if (numberOfPoints > 0){
									var components = section.DataArray.attributes.NumberOfComponents;
									points = new Float32Array( numberOfPoints * components );
									points.set(section.DataArray.text, 0);
								}
								//console.log("Points", points);
								break;

							// if it is strips
							case "Strips" :
								var numberOfStrips = parseInt(piece.attributes.NumberOfStrips);
								if(numberOfStrips > 0){
									var connectivity = new Int32Array(section.DataArray[0].text.length);
									var offset = new Int32Array(section.DataArray[1].text.length);
									connectivity.set(section.DataArray[0].text, 0);
									offset.set(section.DataArray[1].text, 0);

									var size = numberOfStrips + connectivity.length;
									indices = new Uint32Array( 3 * size - 9 * numberOfStrips );
									var indicesIndex = 0;
									for (var i = 0,len = numberOfStrips; i < len; i++) {
										var strip = [];
										for (var s = 0,len1 = offset[i], len0 = 0; s < len1 - len0; s++) {
											strip.push (connectivity[s]);
											if(i > 0){
												len0 = offset[i-1];
											}
										}
										for (var j = 0,len1 = offset[i], len0 = 0; j < len1 - len0 - 2; j++) {
											if ( j % 2 ) {
												indices[ indicesIndex++ ] = strip[ j ];
												indices[ indicesIndex++ ] = strip[ j + 2 ];
												indices[ indicesIndex++ ] = strip[ j + 1 ];
											}else{
												indices[ indicesIndex++ ] = strip[ j ];
												indices[ indicesIndex++ ] = strip[ j + 1 ];
												indices[ indicesIndex++ ] = strip[ j + 2 ];
											}
											if(i > 0){
												len0 = offset[i-1];
											}
										}
									}
								}
								//console.log("Strips", indices);
								break;

							// if it is polys
							case "Polys" :
								var numberOfPolys = parseInt(piece.attributes.NumberOfPolys);
								if(numberOfPolys > 0){
									var connectivity = new Int32Array(section.DataArray[0].text.length);
									var offset = new Int32Array(section.DataArray[1].text.length);
									connectivity.set(section.DataArray[0].text, 0);
									offset.set(section.DataArray[1].text, 0);

									var size = numberOfPolys + connectivity.length;
									indices = new Uint32Array( 3 * size - 9 * numberOfPolys );
									var indicesIndex = 0, connectivityIndex = 0;
									var i = 0,len = numberOfPolys, len0 = 0;
									while(i < len){
										var poly = [];
										var s = 0, len1 = offset[i];
										while(s < len1 - len0){
											poly.push (connectivity[connectivityIndex++]);
											s++;
										}
										var j = 1;
										while(j < len1 - len0 - 1){
											indices[ indicesIndex++ ] = poly[ 0 ];
											indices[ indicesIndex++ ] = poly[ j ];
											indices[ indicesIndex++ ] = poly[ j + 1 ];
											j++;
										}
										i++;
										len0 = offset[i-1];
									}
								}
								//console.log("Polys", indices);
								break;

							default :
								break;
						}
					}
					sectionIndex++;
				}

				var geometry = new THREE.BufferGeometry();
				geometry.setIndex( new THREE.BufferAttribute( indices, 1 ) );
				geometry.addAttribute( 'position', new THREE.BufferAttribute( points, 3 ) );

				if ( normals.length == points.length ) {

					geometry.addAttribute( 'normal', new THREE.BufferAttribute( normals, 3 ) );

				}
				//console.log(json);
				return geometry;
			}else{
				/* TODO for vtu,vti,and other xml formats*/
			}
		}

		function getStringFile(data){
			var stringFile = '';
			var charArray = new Uint8Array( data );
			var i = 0;
			var len = charArray.length;
			while(len--){
				stringFile += String.fromCharCode( charArray[ i++ ] );
			}
			return stringFile;
		}

		// get the 5 first lines of the files to check if there is the key word binary
		var meta = String.fromCharCode.apply( null, new Uint8Array( data, 0, 250 ) ).split( '\n' );
		if (meta[0].indexOf("xml") != -1){

			var stringFile = getStringFile(data);
			return parseXML(stringFile);

		}else if ( meta[ 2 ].includes( 'ASCII' ) ) {

			var stringFile = getStringFile(data);
			return parseASCII( stringFile );

		} else {

			return parseBinary( data );

		}

	}

};

THREE.EventDispatcher.prototype.apply( THREE.VTKLoader.prototype );