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webgl-ply-reader.html
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webgl-ply-reader.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>PLY 3D model viewer based on HTML5 canvas</title>
<script src="sylvester.src.js" type="text/javascript"></script>
<script src="glUtils.js" type="text/javascript"></script>
<script src="webgl-ply-reader.js" type="text/javascript"></script>
<script type="text/javascript">
function point3D(x, y, z)
{
this.x = x;
this.y = y;
this.z = z;
}
function Model(vertices, vertexNormals, polys)
{
// Create a buffer for the model's vertices.
modelVerticesBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, modelVerticesBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STATIC_DRAW);
// Set up the normals for the vertices, so that we can compute lighting.
modelVerticesNormalBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, modelVerticesNormalBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertexNormals), gl.STATIC_DRAW);
// Now set up the colors for the faces. We'll use solid colors
// for each face.
var color = [1.0*220/255, 1.0*220/255, 1.0*30/255, 1.0];
// Convert the array of colors into a table for all the vertices.
var generatedColors = [];
for (i = 0; i < polys.length; i++) {
generatedColors = generatedColors.concat(color);
}
modelVerticesColorBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, modelVerticesColorBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(generatedColors), gl.STATIC_DRAW);
// Build the element array buffer; this specifies the indices
// into the vertex array for each face's vertices.
modelVerticesIndexBuffer = gl.createBuffer();
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, modelVerticesIndexBuffer);
// Now send the element array to GL
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array(polys), gl.STATIC_DRAW);
this.vertices = vertices;
this.normals = vertexNormals;
this.polys = polys;
}
function nextFrame()
{
modelRotation += 0.6;
drawScene();
// FPS calculation
if(!fpslastUpdate)
{
fpslastUpdate = Date.now();
}
else
{
var now = Date.now();
fps.push(1000 / (now - fpslastUpdate));
fpslastUpdate = now;
}
if(fps.length >= fpsFilter)
{
var fpsValue = 0.0;
for(var i = fps.length - fpsFilter; i < fps.length; i++)
fpsValue += fps[i];
document.getElementById('fpsInfo').innerHTML = "" + Math.floor(fpsValue/fpsFilter) + " fps<br/>";
}
if(fps.length >= fpsFilter * 8)
{
fps = fps.slice(fps.length - fpsFilter);
}
}
function processReqChange()
{
try {
if (req.readyState == 4) {
if (req.status == 200) {
initAfterGettingModel(req.responseText)
} else {
alert("Cannot get 3D data:\n" + req.statusText);
}
}
}
catch (e) {
alert(e+' line: ' + e.lineNumber);
}
}
function ply_reader(data)
{
var hasNormal = false;
// Read header
while(data.length)
{
var retval = data.match(/.*/);
var str = retval[0];
data = data.substr(str.length+1);
var retval = str.match(/element (\w+) (\d+)/);
if(retval)
{
if(retval[1] == "vertex")
var npoints = parseInt(retval[2]);
if(retval[1] == "face")
var npolys = parseInt(retval[2]);
}
if(str == "property float nx")
hasNormal = true;
if(str == "end_header")
break;
}
// Read points
var minPoint = new point3D(Infinity, Infinity, Infinity);
var maxPoint = new point3D(-Infinity, -Infinity, -Infinity);
var vertices = [];
var vertexNormals = [];
for (var i = 0; i < npoints; i++)
{
var retval = data.match(/([\d.-]+ ?)+/);
var str = retval[0];
data = data.substr(str.length+1);
var retval = str.match(/([\d.-]+)/g);
var point = new point3D(parseFloat(retval[0]), parseFloat(retval[1]), parseFloat(retval[2]));
vertices.push(point.x, point.y, point.z);
if(hasNormal)
vertexNormals.push(parseFloat(retval[3]), parseFloat(retval[4]), parseFloat(retval[5]));
minPoint.x = Math.min(minPoint.x, point.x);minPoint.y = Math.min(minPoint.y, point.y);minPoint.z = Math.min(minPoint.z, point.z);
maxPoint.x = Math.max(maxPoint.x, point.x);maxPoint.y = Math.max(maxPoint.y, point.y);maxPoint.z = Math.max(maxPoint.z, point.z);
}
// Polygons
var polys = [];
var index = 0;
var newVertices = [];
for (var i = 0; i < npolys; i++)
{
var retval = data.match(/(\d+ ?)+/);
var str = retval[0];
data = data.substr(str.length+1);
var retval = str.match(/(\d+)/g);
var nvertex = parseInt(retval[0]);
var aIndex = parseInt(retval[1]);
var bIndex = parseInt(retval[2]);
var cIndex = parseInt(retval[3]);
if(!hasNormal)
{
// Polygon normal
var p0 = new point3D(vertices[aIndex*3+0], vertices[aIndex*3+1], vertices[aIndex*3+2]);
var p1 = new point3D(vertices[bIndex*3+0], vertices[bIndex*3+1], vertices[bIndex*3+2]);
var p2 = new point3D(vertices[cIndex*3+0], vertices[cIndex*3+1], vertices[cIndex*3+2]);
var v1 = new point3D(p2.x - p1.x, p2.y - p1.y, p2.z - p1.z);
var v2 = new point3D(p0.x - p1.x, p0.y - p1.y, p0.z - p1.z);
var normal = new point3D(v1.y*v2.z-v2.y*v1.z, v1.z*v2.x-v2.z*v1.x, v1.x*v2.y-v2.x*v1.y);
var normalLen = Math.sqrt(normal.x*normal.x + normal.y*normal.y + normal.z*normal.z);
normal.x /= normalLen;
normal.y /= normalLen;
normal.z /= normalLen;
}
if(nvertex == 3 || nvertex == 4)
{
if(!hasNormal)
{
polys.push(index++, index++, index++);
newVertices.push(p0.x, p0.y, p0.z);
newVertices.push(p1.x, p1.y, p1.z);
newVertices.push(p2.x, p2.y, p2.z);
vertexNormals.push(normal.x, normal.y, normal.z);
vertexNormals.push(normal.x, normal.y, normal.z);
vertexNormals.push(normal.x, normal.y, normal.z);
}
else
polys.push(aIndex, bIndex, cIndex);
}
if(nvertex == 4)
{
var dIndex = parseInt(retval[4]);
var p3 = new point3D(vertices[dIndex*3+0], vertices[dIndex*3+1], vertices[dIndex*3+2]);
if(!hasNormal)
{
polys.push(index++, index++, index++);
newVertices.push(p0.x, p0.y, p0.z);
newVertices.push(p2.x, p2.y, p2.z);
newVertices.push(p3.x, p3.y, p3.z);
vertexNormals.push(normal.x, normal.y, normal.z);
vertexNormals.push(normal.x, normal.y, normal.z);
vertexNormals.push(normal.x, normal.y, normal.z);
}
else
polys.push(aIndex, cIndex, dIndex);
}
}
if(!hasNormal)
{
vertices = newVertices;
}
document.getElementById('fileinfo').innerHTML += ", polygons: "+npolys+", points: "+npoints;
// Move to center of object
var centerMove = new point3D(-(maxPoint.x + minPoint.x)/2, -(maxPoint.y + minPoint.y)/2, -(maxPoint.z + minPoint.z)/2);
var scaleY = (maxPoint.y - minPoint.y) / 2;
for (var i = 0; i < vertices.length; i+=3)
{
vertices[i+0] += centerMove.x;
vertices[i+1] += centerMove.y;
vertices[i+2] += centerMove.z;
vertices[i+0] /= scaleY;
vertices[i+1] /= scaleY;
vertices[i+2] /= scaleY;
}
// Create model
model = new Model(vertices, vertexNormals, polys);
// Return moving to center model
return model;
}
var PLYFile = 'monkey.ply';
var fpsWanted = 24;
var fps = [], fpslastUpdate;
var fpsFilter = fpsWanted*2;
function init()
{
document.getElementById('startButton').disabled = false;
// Redefine model file
var retval = document.location.search.match(/file=([\w\.]+)/);
if(retval)
PLYFile = retval[1];
document.getElementById('fileinfo').innerHTML = "File: <a href='"+PLYFile+"'>"+PLYFile+"</a>";
canvas = document.getElementById("canvas");
initWebGL(); // Initialize the GL context
// Only continue if WebGL is available and working
if (gl) {
gl.clearColor(0.0, 0.0, 0.0, 1.0); // Set clear color to black, fully opaque
gl.enable(gl.DEPTH_TEST); // Enable depth testing
gl.depthFunc(gl.LEQUAL); // Near things obscure far things
gl.clear(gl.COLOR_BUFFER_BIT|gl.DEPTH_BUFFER_BIT); // Clear the color as well as the depth buffer.
}
// Initialize the shaders; this is where all the lighting for the
// vertices and so forth is established.
initShaders();
// Here's where we call the routine that builds all the objects
// we'll be drawing.
try {
req = new XMLHttpRequest();
} catch (e) {
alert("Unsupported browser:\n" + e);
}
if (req) {
// Try to get model
req.open("GET", PLYFile, true);
req.onreadystatechange = processReqChange;
req.send(null);
}
}
function initAfterGettingModel(data)
{
moveForCentering = ply_reader(data);
if(PLYFile == 'teapot.ply')
{
additionalRotationAngle = -90.0;
additionalRotationMatrix = [1, 0, 0];
}
drawScene();
}
function startRotating()
{
var radios = document.getElementsByName('fps');
for (var index in radios)
if(radios[index].checked == true)
fpsWanted = radios[index].value;
document.getElementById('fpsInfo').innerHTML = "";
document.getElementById('startButton').disabled = true;
document.getElementById('stopButton').disabled = false;
if(typeof timer != "undefined")
return;
timer = setInterval(nextFrame, 1000 / fpsWanted);
}
function stopRotating()
{
document.getElementById('startButton').disabled = false;
document.getElementById('stopButton').disabled = true;
if(!timer)
return;
clearInterval(timer);
timer = undefined;
fps = [];
}
function changeFPS(input)
{
if(typeof timer != "undefined")
{
stopRotating();
startRotating();
}
}
</script>
<style type="text/css">
canvas { border: 0px solid black; }
</style>
<script id="shader-fs" type="x-shader/x-fragment">
varying lowp vec4 vColor;
varying highp vec3 vLighting;
uniform sampler2D uSampler;
void main(void)
{
gl_FragColor = vec4(vColor.rgb * vLighting, vColor.a);
}
</script>
<script id="shader-vs" type="x-shader/x-vertex">
attribute highp vec3 aVertexNormal;
attribute highp vec3 aVertexPosition;
attribute vec4 aVertexColor;
uniform highp mat4 uNormalMatrix;
uniform highp mat4 uMVMatrix;
uniform highp mat4 uPMatrix;
varying highp vec3 vLighting;
varying lowp vec4 vColor;
void main(void) {
gl_Position = uPMatrix * uMVMatrix * vec4(aVertexPosition, 1.0);
vColor = aVertexColor;
// Apply lighting effect
highp vec3 ambientLight = vec3(0.1, 0.1, 0.1);
highp vec3 directionalLightColor = vec3(0.9, 0.9, 0.9);
highp vec3 directionalVector = vec3(0.0, 0.0, 0.8);
highp vec4 transformedNormal = uNormalMatrix * vec4(aVertexNormal, 1.0);
highp float directional = max(dot(transformedNormal.xyz, directionalVector), 0.0);
vLighting = ambientLight + (directionalLightColor * directional);
}
</script>
</head>
<body onload="init()">
<h1>PLY 3D model viewer based on HTML5 canvas on WebGL contex</h1>
<p>Features:
<ul>
<li>3D operations: rotating, moving object center</li>
<li>Directional light</li>
<li>Perspetive camera</li>
</ul>
</p>
<canvas id="canvas" width="400" height="225"></canvas>
<br>
<div id="fileinfo"></div>
<br>
<span id="fpsInfo"></span>
Max allowed:
<label><input type="radio" name="fps" onclick="changeFPS(this)" value="12"/>12 fps</label>
<label><input type="radio" name="fps" onclick="changeFPS(this)" value="24" checked="checked"/>24 fps</label>
<label><input type="radio" name="fps" onclick="changeFPS(this)" value="48"/>48 fps</label>
<label><input type="radio" name="fps" onclick="changeFPS(this)" value="60"/>60 fps</label>
<label><input type="radio" name="fps" onclick="changeFPS(this)" value="72"/>72 fps</label>
<label><input type="radio" name="fps" onclick="changeFPS(this)" value="100"/>100 fps</label>
<label><input type="radio" name="fps" onclick="changeFPS(this)" value="120"/>120 fps</label>
<br>
<button id="startButton" onclick="startRotating()">Start Y rotating</button> <button id="stopButton" onclick="stopRotating()" disabled="disabled">Stop Y rotating</button>
</body>
</html>