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culling.html
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culling.html
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<!--
Copyright 2009, Google Inc.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-->
<!--
O3D Culling.
Make sure things off screen get culled.
By default nothing is culled. If you want object to be culled you must setup
bounding boxes in the transform graph that fit the needs of your application
and then turn on culling for those objects you want culled.
-->
<!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>
Culling.
</title>
<script type="text/javascript" src="../o3d-webgl/base.js"></script>
<script type="text/javascript" src="../o3djs/base.js"></script>
<script type="text/javascript" id="o3dscript">
o3djs.base.o3d = o3d;
o3djs.require('o3djs.webgl');
o3djs.require('o3djs.util');
o3djs.require('o3djs.math');
o3djs.require('o3djs.rendergraph');
o3djs.require('o3djs.primitives');
o3djs.require('o3djs.material');
// 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_totalTransformsElement;
var g_transformsProcessedElement;
var g_transformsCulledElement;
var g_totalDrawElementsElement;
var g_totalDrawableThingsElement;
var g_drawElementsProcessedElement;
var g_drawElementsCulledElement;
var g_drawElementsRenderedElement;
var g_primitivesRenderedElement;
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 = 200;
function createInstances(pack, shape) {
// Make a grid of transforms and put a shape instance on each one.
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;
// Turn on culling for this transform.
groupTransform.cull = true;
var boundingBox = new g_o3d.BoundingBox([0, 0, 0],
[0, 0, 0]);
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;
// Turn on culling for this transform.
transform.cull = true;
transform.addShape(shape);
// Add up the bounding boxes of all the elements.
var elements = shape.elements;
var box = elements[0].boundingBox;
for (var ee = 1; ee < elements.length; ee++) {
box = box.add(elements[ee].boundingBox);
}
// Set the transform to have a bounding box that is the sum
// of all the elements under it.
transform.boundingBox = box;
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('diffuse', '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),
1];
// Add the box for this bounding box to the box for the group.
var box = transform.boundingBox.mul(transform.localMatrix);
boundingBox = boundingBox.add(box);
}
}
}
// Set the bounding box for the group transform to encompass all
// the transforms below it.
groupTransform.boundingBox = boundingBox;
}
}
}
}
/**
* Creates the client area.
*/
function init() {
// These are here so that they are visible to both the browser (so
// selenium sees them) and the embedded V8 engine.
window.g_clock = 0;
window.g_finished = false; // for selenium testing.
o3djs.webgl.makeClients(initStep2);
}
/**
* Initializes O3D and creates one shape.
* @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;
// Set window.g_client as well. Otherwise when the sample runs in
// V8, selenium won't be able to find this variable (it can only see
// the browser environment).
window.g_client = g_client = o3dElement.client;
g_totalDrawableThingsElement =
o3djs.util.getElementById('totalDrawableThings');
g_totalTransformsElement =
o3djs.util.getElementById('totalTransforms');
g_transformsProcessedElement =
o3djs.util.getElementById('transformsProcessed');
g_transformsCulledElement =
o3djs.util.getElementById('transformsCulled');
g_totalDrawElementsElement =
o3djs.util.getElementById('totalDrawElements');
g_drawElementsProcessedElement =
o3djs.util.getElementById('drawElementsProcessed');
g_drawElementsCulledElement =
o3djs.util.getElementById('drawElementsCulled');
g_drawElementsRenderedElement =
o3djs.util.getElementById('drawElementsRendered');
g_primitivesRenderedElement =
o3djs.util.getElementById('primitivesRendered');
// 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 material = o3djs.material.createBasicMaterial(
g_pack,
g_viewInfo,
[1, 1, 1, 1]);
// Create 2 spheres.
var shape1 = o3djs.primitives.createSphere(
g_pack,
material,
40,
20,
20,
g_math.matrix4.translation([-50, 0, 0]));
var shape2 = o3djs.primitives.createSphere(
g_pack,
material,
20,
20,
20,
g_math.matrix4.translation([50, 0, 0]));
// Create a shape and move the 2 sphere primitives to the same shape.
// This is done to show that each of the primitives under the shape
// will get culled separately.
var shape = g_pack.createObject('Shape');
shape1.elements[0].owner = shape;
shape2.elements[0].owner = shape;
// delete the old shapes.
g_pack.removeObject(shape1);
g_pack.removeObject(shape2);
var elements = shape.elements;
// Turn on culling for the two sphere elements.
elements[0].cull = true;
elements[1].cull = true;
createInstances(g_pack, shape);
g_totalDrawableThingsElement.innerHTML =
GROUPS_ACROSS * UNITS_ACROSS_GROUP *
GROUPS_ACROSS * UNITS_ACROSS_GROUP *
GROUPS_ACROSS * UNITS_ACROSS_GROUP;
g_totalDrawElementsElement.innerHTML = g_client.getObjectsByClassName(
'o3d.DrawElement').length;
g_totalTransformsElement.innerHTML = g_client.getObjectsByClassName(
'o3d.Transform').length;
// Setup an onrender callback for animation.
g_client.setRenderCallback(onrender);
window.g_finished = true; // for selenium testing.
}
var g_flag = false;
// spin the camera.
function onrender(renderEvent) {
g_framesRendered++;
// Get the number of seconds since the last render.
var elapsedTime = renderEvent.elapsedTime;
// Update g_clock in the browser and cache a V8 copy that can be
// accessed efficiently. g_clock must be in the browser for selenium.
var clock = window.g_clock + elapsedTime * window.g_timeMult;
window.g_clock = clock;
var x = Math.sin(clock * 0.1) * 300;
var z = Math.cos(clock * 0.1) * 300;
var y = Math.sin(clock * 0.2) * 300;
g_viewInfo.drawContext.view = g_math.matrix4.lookAt(
[x, y, z],
[0, 0, 0],
[0, 1, 0]);
g_transformsProcessedElement.innerHTML = renderEvent.transformsProcessed;
g_transformsCulledElement.innerHTML = renderEvent.transformsCulled;
g_drawElementsProcessedElement.innerHTML = renderEvent.drawElementsProcessed;
g_drawElementsCulledElement.innerHTML = renderEvent.drawElementsCulled;
g_drawElementsRenderedElement.innerHTML = renderEvent.drawElementsRendered;
g_primitivesRenderedElement.innerHTML = renderEvent.primitivesRendered;
}
/**
* Remove any callbacks so they don't get called after the page has unloaded.
*/
function unload() {
if (g_client) {
g_client.cleanup();
}
}
</script>
</head>
<body onload="init()" onunload="unload()">
<h1>Culling</h1>
Objects off screen should get culled.
<br/>
<!-- Start of O3D client area -->
<div id="o3d" style="width: 800px; height: 600px;"></div>
<!-- End of O3D client area -->
<table>
<tr><td>Total Drawable Things:</td><td><span id="totalDrawableThings">-</span></td></tr>
<tr><td>Total Transforms:</td><td><span id="totalTransforms">-</span></td></tr>
<tr><td>Transforms Processed:</td><td><span id="transformsProcessed">-</span></td></tr>
<tr><td>Transforms Culled:</td><td><span id="transformsCulled">-</span></td></tr>
<tr><td>Total DrawElements:</td><td><span id="totalDrawElements">-</span></td></tr>
<tr><td>DrawElements Processed:</td><td><span id="drawElementsProcessed">-</span></td></tr>
<tr><td>DrawElements Culled:</td><td><span id="drawElementsCulled">-</span></td></tr>
<tr><td>DrawElements Rendered:</td><td><span id="drawElementsRendered">-</span></td></tr>
<tr><td>Primitives Rendered:</td><td><span id="primitivesRendered">-</span></td></tr>
</table>
</body>
</html>