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canvas-ply-reader.html
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canvas-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 type="text/javascript">
function color(r, g, b, a)
{
this.r = r;
this.g = g;
this.b = b;
this.a = a;
this.lightnessMap = [];
}
color.prototype.lightness = function(lightnessK)
{
var min = Math.min(this.r, this.g, this.b);
var max = Math.max(this.r, this.g, this.b);
var lightnessMapIndex = Math.round(lightnessK * 255);
if(this.lightnessMap[lightnessMapIndex])
return this.lightnessMap[lightnessMapIndex];
// Simple processing gray colors
if(min == max)
{
return this.lightnessMap[lightnessMapIndex] = new color(this.r * lightnessK, this.g * lightnessK, this.b * lightnessK, this.a);
}
// Convert to HSL
var H;
var S;
var L = (min + max) / 2 / 255;
if(max == this.r && this.g >= this.b)
H = 60 * (this.g - this.b) / (max - min) + 0;
else if(max == this.r)
H = 60 * (this.g - this.b) / (max - min) + 360;
else if(max == this.g)
H = 60 * (this.b - this.r) / (max - min) + 120;
else if(max == this.b)
H = 60 * (this.r - this.g) / (max - min) + 240;
H = H % 360;
if(L == 0 || max == min)
S = 0;
else if(L <= 0.5)
S = (max - min) / (2 * L) / 255;
else if(L < 1)
S = (max - min) / (2 - 2*L) / 255;
else if(L == 1)
S = 1;
// Apply lightness
L = L * lightnessK;
// Convert to RGB
if(L <= 0.5)
var Q = L * (1 + S);
else
var Q = L + S - (L * S);
var P = 2 * L - Q;
var Hk = H / 360;
var Tr = Hk + 1/3; if(Tr < 0) Tr = Tr + 1;
var Tg = Hk;
var Tb = Hk - 1/3; if(Tr > 1) Tr = Tr - 1;
if(Tr < 1/6)
var r = P + ((Q - P) * 6 * Tr);
else if(Tr < 1/2)
var r = Q;
else if(Tr < 2/3)
var r = P + ((Q - P) * 6 * (2/3 - Tr));
else
var r = P;
if(Tg < 1/6)
var g = P + ((Q - P) * 6 * Tg);
else if(Tg < 1/2)
var g = Q;
else if(Tg < 2/3)
var g = P + ((Q - P) * 6 * (2/3 - Tg));
else
var g = P;
if(Tb < 1/6)
var b = P + ((Q - P) * 6 * Tb);
else if(Tb < 1/2)
var b = Q;
else if(Tb < 2/3)
var b = P + ((Q - P) * 6 * (2/3 - Tb));
else
var b = P;
return this.lightnessMap[lightnessMapIndex] = new color(Math.round(r*255), Math.round(g*255), Math.round(b*255), this.a);
}
function point3D(x, y, z)
{
this.x = x;
this.y = y;
this.z = z;
}
point3D.prototype.move = function(p3D)
{
this.x += p3D.x;
this.y += p3D.y;
this.z += p3D.z;
}
point3D.prototype.swap = function(p3D)
{
this.x = p3D.x;
this.y = p3D.y;
this.z = p3D.z;
}
point3D.prototype.rotate = function(axis, angleRad)
{
switch (axis)
{
case "x":
{
var tempPoint = new point3D(
this.x,
this.y * Math.cos(angleRad) - this.z * Math.sin(angleRad),
this.y * Math.sin(angleRad) + this.z * Math.cos(angleRad)
);
this.swap(tempPoint);
break;
}
case "y":
{
var tempPoint = new point3D(
this.x * Math.cos(angleRad) + this.z * Math.sin(angleRad),
this.y,
-this.x * Math.sin(angleRad) + this.z * Math.cos(angleRad)
);
this.swap(tempPoint);
break;
}
case "z":
{
var tempPoint = new point3D(
this.x * Math.cos(angleRad) - this.y * Math.sin(angleRad),
this.x * Math.sin(angleRad) + this.y * Math.cos(angleRad),
this.z
);
this.swap(tempPoint);
break;
}
}
}
function poly() // Dynamic amount of parameters
{
var normal = arguments[0];
var points = [];
for(var i = 1; i < arguments.length; i++)
{
points.push(arguments[i]);
}
this.points = points;
// Calculating normal
if(normal === null)
{
var v1 = new point3D(points[2].x - points[1].x, points[2].y - points[1].y, points[2].z - points[1].z);
var v2 = new point3D(points[0].x - points[1].x, points[0].y - points[1].y, points[0].z - points[1].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;
}
this.normal = normal;
this.hidden = Math.acos(this.normal.z) >= Math.PI / 2;
this.recalculateDistanceToScreen();
}
poly.prototype.move = function(p3D)
{
for(var i = 0; i < this.points.length; i++)
{
var point = this.points[i];
point.move(p3D);
}
this.recalculateDistanceToScreen();
}
poly.prototype.rotate = function(axis, angleRad)
{
for(var i = 0; i < this.points.length; i++)
{
var point = this.points[i];
point.rotate(axis, angle);
}
this.normal.rotate(axis, angleRad);
this.hidden = Math.acos(this.normal.z) >= Math.PI / 2;
this.recalculateDistanceToScreen();
}
poly.prototype.put = function(center, fillColor, edgeColor)
{
// Check visibility
if(this.hidden)
return;
var normalAngleRad = Math.acos(this.normal.z);
var lightIntensity = 1 - 2 * (normalAngleRad / Math.PI); // Convert RAD -> GRAD
var newColor = fillColor.lightness(lightIntensity);
ctx.fillStyle = 'rgba('+newColor.r+','+newColor.g+','+newColor.b+','+newColor.a+')';
ctx.beginPath();
for(var i = 0; i < this.points.length; i++)
{
var point = this.points[i];
if(i)
ctx.lineTo(center.x + parseInt(point.x), center.y - parseInt(point.y));
else
ctx.moveTo(center.x + parseInt(point.x), center.y - parseInt(point.y));
}
ctx.fill();
// Paint edges to fix problem with dark liner between polygons
if(!edgeColor)
edgeColor = fillColor;
ctx.lineWidth = 1;
var newColor = edgeColor.lightness(lightIntensity);
ctx.strokeStyle = 'rgba('+newColor.r+','+newColor.g+','+newColor.b+','+newColor.a+')';
ctx.beginPath();
var point = this.points[this.points.length-1];
ctx.moveTo(center.x + parseInt(point.x), center.y - parseInt(point.y));
for(var i = 0; i < this.points.length; i++)
{
var point = this.points[i];
ctx.lineTo(center.x + parseInt(point.x), center.y - parseInt(point.y));
}
ctx.stroke();
}
poly.prototype.recalculateDistanceToScreen = function()
{
var distance = 0.0;
for(var i = 0; i < this.points.length; i++)
{
distance += this.points[i].z;
}
this.distanceToScreen = distance / this.points.length;
}
function Model(polys, points, fillColor, edgeColor)
{
this.polys = polys;
this.points = points;
this.fillColor = fillColor;
this.edgeColor = edgeColor;
}
Model.prototype.move = function(p3D)
{
for(var i = 0; i < this.points.length - this.polys.length; i++)
{
var point = this.points[i];
point.move(p3D);
}
for(var i = 0; i < this.polys.length; i++)
{
var poly = this.polys[i];
poly.recalculateDistanceToScreen();
}
}
Model.prototype.put = function (center)
{
var zSorting = [];
for(var i = 0; i < this.polys.length; i++)
{
var poly = this.polys[i];
if(poly.hidden)
continue;
zSorting.push(poly.distanceToScreen);
}
zSorting.sort((function(a, b){return a - b;}));
var lastZ;
for(var i = 0; i < zSorting.length; i++)
{
if(lastZ == zSorting[i])
continue;
lastZ = zSorting[i];
for(var j = 0; j < this.polys.length; j++)
{
var poly = this.polys[j];
if(poly.hidden)
continue;
if(poly.distanceToScreen != zSorting[i])
continue;
poly.put(center, this.fillColor, this.edgeColor);
}
}
return zSorting.length;
}
Model.prototype.rotate = function(axis, angleRad)
{
for(var i = 0; i < this.points.length; i++)
{
this.points[i].rotate(axis, angleRad);
}
for(var i = 0; i < this.polys.length; i++)
{
this.polys[i].recalculateDistanceToScreen();
this.polys[i].hidden = Math.acos(this.polys[i].normal.z) >= Math.PI / 2;
}
}
function nextFrame()
{
ctx.fillStyle = 'rgba(0, 0, 0, 1)';
ctx.fillRect(0, 0, canvas.width, canvas.height); // clear canvas
model.rotate('y', 0.6 * Math.PI / 180);
ctx.fillStyle = 'rgba(50, 50, 200, 1)';
ctx.strokeStyle = 'rgba(60, 60, 210, 1)';
var visiblePolygons = model.put(centerScreen);
// 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];
ctx.fillStyle = "white";
ctx.fillText("" + Math.floor(fpsValue/fpsFilter) + " fps, "+visiblePolygons+" visible polygons, "+Math.round(visiblePolygons*fpsValue/fpsFilter)+" polygons per sec", 8, 16);
}
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 model;
var scaleFactor = PLYFile == 'monkey.ply' ? 100 : 50 ;
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 points = [], uniquePointsKeys = [], uniquePoints = [];
var normals = [];
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 uniqueKey = ""+retval[0]+" "+retval[1]+" "+retval[2];
var index = uniquePointsKeys.indexOf(uniqueKey);
if(index == -1)
{
var point = new point3D(parseFloat(retval[0])*scaleFactor, parseFloat(retval[1])*scaleFactor, parseFloat(retval[2])*scaleFactor);
uniquePointsKeys.push(uniqueKey);
uniquePoints.push(point);
}
else
{
var point = uniquePoints[index];
}
points.push(point);
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);
if(hasNormal)
{
var normal = new point3D(parseFloat(retval[3]), parseFloat(retval[4]), parseFloat(retval[5]));
normals.push(normal);
}
}
// Polygons
var polys = [];
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 newPolyString = "new poly(";
newPolyString += hasNormal ? "normals["+retval[1]+"]," : "null,";
for (var j = 0; j < retval.length; j++)
{
retval[j] = parseInt(retval[j]);
if(j >= 2)
newPolyString += ",";
if(j)
newPolyString += "points["+retval[j]+"]";
}
newPolyString += ");";
var polygon = eval(newPolyString);
polys.push(polygon);
var uniqueKey = ""+polygon.normal.x+" "+polygon.normal.y+" "+polygon.normal.z;
var index = uniquePointsKeys.indexOf(uniqueKey);
if(index == -1)
{
uniquePointsKeys.push(uniqueKey);
uniquePoints.push(polygon.normal);
}
else
{
polygon.normal = uniquePoints[index];
}
}
var divinfo = document.getElementById('fileinfo');
divinfo.innerHTML += ", polygons: "+npolys+", points: "+npoints;
// Create model
model = new Model(polys, uniquePoints, new color(220,220,30,1), null);
// Center model
model.move(new point3D(-(maxPoint.x + minPoint.x)/2, -(maxPoint.y + minPoint.y)/2, -(maxPoint.z + minPoint.z)/2));
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];
var divinfo = document.getElementById('fileinfo');
divinfo.innerHTML = "File: <a href='"+PLYFile+"'>"+PLYFile+"</a>";
canvas = document.getElementById('canvas');
if (canvas.getContext){
ctx = canvas.getContext('2d');
ctx.fillStyle = 'rgba(0, 0, 0, 1)';
ctx.fillRect(0, 0, canvas.width, canvas.height); // clear canvas
centerScreen = new point3D(canvas.width / 2, canvas.height / 2, 0);
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)
{
model = ply_reader(data);
var divinfo = document.getElementById('fileinfo');
divinfo.innerHTML += ", unique points+normals: "+model.points.length;
if(PLYFile == 'teapot.ply')
model.rotate('x', -90 * Math.PI / 180);
model.put(centerScreen);
}
function startRotating()
{
var radios = document.getElementsByName('fps');
for (var index in radios)
if(radios[index].checked == true)
fpsWanted = radios[index].value;
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>
</head>
<body onload="init();">
<h1>PLY 3D model viewer based on HTML5 canvas on 2D contex</h1>
<p>Features:
<ul>
<li>3D operations: rotating, moving object center</li>
<li>Directional light</li>
<li>Highlighting edges</li>
<li>Painter's algorithm for sorting polygons</li>
<li>Optimizations:
<ul>
<li>Skip outputting of invisible polygons</li>
<li>Skip processing of duplicated points, normals</li>
</ul>
</li>
</ul>
</p>
<canvas id="canvas" width="400" height="225"></canvas>
<br>
<div id="fileinfo"></div>
<br>
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>