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<!--
O3D Instancing example.
Load the teapot, display it a bunch of times.
-->
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>
Instancing.
</title>
<!-- Include sample javascript library functions-->
<script type="text/javascript" src="o3djs/base.js"></script>
<!-- Our javascript code -->
<script type="text/javascript" id="o3dscript">
o3djs.require('o3djs.util');
o3djs.require('o3djs.math');
o3djs.require('o3djs.rendergraph');
o3djs.require('o3djs.pack');
o3djs.require('o3djs.scene');
// Events
// init() once the page has finished loading.
// unload() when the page is unloaded.
window.onload = init;
window.onunload = unload;
// global variables
var g_o3d;
var g_math;
var g_client;
var g_viewInfo;
var g_pack;
var g_clock = 0;
var g_timeMult = 1;
var g_finished = false; // for selenium testing
/**
* Loads a scene into the transform graph.
* @param {!o3d.Pack} pack Pack to load scene into.
* @param {string} fileName filename of the scene.
* @param {!o3d.Transform} parent parent node in the transform graph to
* which to load the scene into.
*/
function loadScene(pack, fileName, parent) {
// Get our full path to the scene
var scenePath = o3djs.util.getCurrentURI() + fileName;
// Load the file given the full path, and call the callback function
// when its done loading.
o3djs.scene.loadScene(g_client, pack, parent, scenePath, callback);
/**
* Our callback is called once the scene has been loaded into memory
* from the web or locally.
* @param {!o3d.Pack} pack The pack that was passed in above.
* @param {!o3d.Transform} parent The parent that was passed in above.
* @param {*} exception null if loading succeeded.
*/
function callback(pack, parent, exception) {
if (exception) {
alert('Could not load: ' + fileName + '\n' + exception);
return;
}
// Generate draw elements and setup material draw lists.
o3djs.pack.preparePack(pack, g_viewInfo);
// Find the "shape" for the teapot.
// I'm going to assume there is only one since I know the contents
// of the file.
var shape = pack.getObjectsByClassName('o3d.Shape')[0];
// now make a grid of transforms and put a teapot instance on each one
for (var x = 0; x < 10; x++) {
for (var y = 0; y < 10; y++) {
for (var z = 0; z < 10; z++) {
var transform = pack.createObject('Transform');
transform.parent = g_client.root;
transform.addShape(shape);
var angles = [
(x - 4.5) * 0.2,
(y - 4.5) * 0.2,
(z - 4.5) * 0.2];
transform.translate((x - 4.5) * 100,
(y - 4.5) * 100,
(z - 4.5) * 100);
transform.rotateZYX(angles);
}
}
}
g_finished = true; // for selenium testing.
}
}
/**
* Creates the client area.
*/
function init() {
o3djs.util.makeClients(initStep2);
}
/**
* Initializes O3D and loads the scene into the transform graph.
* @param {Array} clientElements Array of o3d object elements.
*/
function initStep2(clientElements) {
// Initializes global variables and libraries.
var o3dElement = clientElements[0];
g_o3d = o3dElement.o3d;
g_math = o3djs.math;
g_client = o3dElement.client;
// Creates a pack to manage our resources/assets
g_pack = g_client.createPack();
// Create the render graph for a view.
g_viewInfo = o3djs.rendergraph.createBasicView(
g_pack,
g_client.root,
g_client.renderGraphRoot);
// Create our projection matrix, with a vertical field of view of 45 degrees
// a near clipping plane of 0.1 and far clipping plane of 10000.
g_viewInfo.drawContext.projection = g_math.matrix4.perspective(
g_math.degToRad(45),
g_client.width / g_client.height,
0.1,
10000);
// Creates a transform to put our data on.
var my_data_root = g_pack.createObject('Transform');
// Load the scene into the transform graph as a child my_data_root
loadScene(g_pack, 'assets/teapot.o3dtgz', my_data_root);
// Setup an onrender callback for animation.
g_client.setRenderCallback(onrender);
}
// spin the camera.
function onrender(render_event) {
// Get the number of seconds since the last render.
var elapsedTime = render_event.elapsedTime;
g_clock += elapsedTime * g_timeMult;
var x = Math.sin(g_clock * 0.41) * 400;
var z = Math.cos(g_clock * 0.31) * 1000;
var y = Math.sin(g_clock * 0.61) * 200;
g_viewInfo.drawContext.view = g_math.matrix4.lookAt([x, y, z], // eye
[0, 0, 0], // target
[0, 1, 0]); // up
}
/**
* Removes any callbacks so they don't get called after the page has unloaded.
*/
function unload() {
if (g_client) {
g_client.cleanup();
}
}
</script>
</head>
<body>
<h1>Instancing</h1>
1000 Teapots
<br/>
<!-- Start of O3D plugin -->
<div id="o3d" style="width: 800px; height: 600px;"></div>
<!-- End of O3D plugin -->
</body>
</html>