topical media & game development
graphic-o3d-samples-zsorting.htm / htm
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<!--
O3D ZSorting.
-->
<!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>
ZSorting.
</title>
<!-- Include sample javascript library functions-->
<script type="text/javascript" src="o3djs/base.js"></script>
<!-- Our javascript code -->
<script type="text/javascript">
o3djs.require('o3djs.util');
o3djs.require('o3djs.math');
o3djs.require('o3djs.rendergraph');
o3djs.require('o3djs.primitives');
o3djs.require('o3djs.effect');
// Events
// init() once the page has finished loading.
// unload() when the page is unloaded.
window.onload = init;
window.onunload = unload;
// global variables
var g_timeMult = 1.0;
var g_framesRendered = 0;
var g_o3d;
var g_math;
var g_client;
var g_viewInfo;
var g_pack;
var g_clock = 0;
var g_finished = false; // for selenium testing
var g_groupTransforms = [];
var GROUPS_ACROSS = 2;
var UNITS_ACROSS_GROUP = 2;
var TOTAL_ACROSS = GROUPS_ACROSS * UNITS_ACROSS_GROUP;
var HALF_WIDTH = TOTAL_ACROSS * 0.0;
var UNIT_SPACING = 100;
Make a grid of transforms and put a teapot instance on each one
parameter: {!o3d.Pack} pack Pack to create transforms in.
parameter: {!o3d.Shape} shape Shape to instance.
function createInstances(pack, shape) {
for (var g = 0; g < GROUPS_ACROSS; g++) {
for (var h = 0; h < GROUPS_ACROSS; h++) {
for (var i = 0; i < GROUPS_ACROSS; i++) {
var groupTransform = pack.createObject('Transform');
g_groupTransforms[g_groupTransforms.length] = groupTransform;
groupTransform.parent = g_client.root;
groupTransform.translate(
(g * UNITS_ACROSS_GROUP - HALF_WIDTH) * UNIT_SPACING,
(h * UNITS_ACROSS_GROUP - HALF_WIDTH) * UNIT_SPACING,
(i * UNITS_ACROSS_GROUP - HALF_WIDTH) * UNIT_SPACING);
for (var x = 0; x < UNITS_ACROSS_GROUP; x++) {
for (var y = 0; y < UNITS_ACROSS_GROUP; y++) {
for (var z = 0; z < UNITS_ACROSS_GROUP; z++) {
var transform = pack.createObject('Transform');
transform.parent = groupTransform;
transform.addShape(shape);
transform.translate(
(x - UNITS_ACROSS_GROUP * 0.5) * UNIT_SPACING,
(y - UNITS_ACROSS_GROUP * 0.5) * UNIT_SPACING,
(z - UNITS_ACROSS_GROUP * 0.5) * UNIT_SPACING);
transform.createParam('colorMult', 'ParamFloat4').value = [
(g * UNITS_ACROSS_GROUP + x) * (1 / TOTAL_ACROSS),
(h * UNITS_ACROSS_GROUP + y) * (1 / TOTAL_ACROSS),
(i * UNITS_ACROSS_GROUP + z) * (1 / TOTAL_ACROSS),
0.5];
}
}
}
}
}
}
}
Creates the client area.
function init() {
o3djs.util.makeClients(initStep2);
}
Initializes O3D and creates one shape.
parameter: {Array} clientElements Array of o3d object elements.
function initStep2(clientElements) {
// Initialize 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();
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);
// Create and load the effect.
var effect = g_pack.createObject('Effect');
o3djs.effect.loadEffect(effect, 'shaders/phong-with-colormult.shader');
// Create a Material for the effect.
var material = g_pack.createObject('Material');
// Apply our effect to this material.
material.effect = effect;
// Set the material's drawList
material.drawList = g_viewInfo.zOrderedDrawList;
// Create the params the effect needs on the material.
effect.createUniformParameters(material);
// Set the material parameters.
material.getParam('lightWorldPos').value = [1000, 1000, 0];
material.getParam('lightIntensity').value = [1, 1, 1, 1];
material.getParam('ambientIntensity').value = [0.1, 0.1, 0.1, 1];
material.getParam('ambient').value = [1, 1, 1, 1];
material.getParam('diffuse').value = [1, 1, 1, 1];
material.getParam('specular').value = [0.5, 0.5, 0.5, 1];
material.getParam('shininess').value = 50;
// Create a sphere.
var shape = o3djs.primitives.createSphere(g_pack, material, 30, 20, 20);
createInstances(g_pack, shape);
// Setup an onrender callback for animation.
g_client.setRenderCallback(onrender);
g_finished = true; // for selenium testing.
}
// spin the camera.
function onrender(renderEvent) {
g_framesRendered++;
// Get the number of seconds since the last render.
var elapsedTime = renderEvent.elapsedTime;
g_clock += elapsedTime * g_timeMult;
var x = Math.sin(g_clock * 0.1) * 400;
var z = Math.cos(g_clock * 0.1) * 400;
var y = Math.sin(g_clock * 0.2) * 400;
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>ZSorting</h1>
Objects get zsorted for transparency.
<br/>
<!-- Start of O3D plugin -->
<div id="o3d" style="width: 800px; height: 600px"></div>
<!-- End of O3D plugin -->
</body>
</html>
(C) Æliens
20/2/2008
You may not copy or print any of this material without explicit permission of the author or the publisher.
In case of other copyright issues, contact the author.
