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billboards.html
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billboards.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.
-->
<!--
Billboard example.
-->
<!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>
Billboard Example
</title>
<!-- Include sample javascript library functions-->
<script type="text/javascript" src="../o3d-webgl/base.js"></script>
<script type="text/javascript" src="../o3djs/base.js"></script>
<!-- Our javascript code -->
<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');
o3djs.require('o3djs.io');
o3djs.require('o3djs.loader');
// Events
// init() once the page has finished loading.
// unload() when the page is unloaded.
window.onload = init;
window.onunload = unload;
// global variables
var g_o3dElement;
var g_o3d;
var g_math;
var g_client;
var g_viewInfo;
var g_pack;
var g_root;
var g_globalParams;
var g_o3dElement;
var g_clock = 0;
var g_timeMult = 1;
var g_finished = false; // for selenium testing
var g_cameraRadius = 35;
var g_cameraSpeed = 0.3;
var g_randSeed = 0;
var g_textures = {};
/**
* Creates the client area.
*/
function init() {
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.
g_o3dElement = clientElements[0];
g_o3d = g_o3dElement.o3d;
g_math = o3djs.math;
g_client = g_o3dElement.client;
// Creates a pack to manage our resources/assets
g_pack = g_client.createPack();
g_root = g_pack.createObject('Transform');
g_viewInfo = o3djs.rendergraph.createBasicView(
g_pack,
g_root,
g_client.renderGraphRoot);
g_viewInfo.drawContext.projection = g_math.matrix4.perspective(
g_math.degToRad(45), // field of view.
g_client.width / g_client.height, // aspect ratio
0.1, // Near plane.
5000); // Far plane.
var loader = o3djs.loader.createLoader(initStep3);
loadTexture(loader, 'purple-flower.png');
loadTexture(loader, 'pillar.png');
loader.finish();
}
function loadTexture(loader, filename) {
loader.loadTexture(g_pack,
o3djs.util.getAbsoluteURI('../assets/' + filename),
rememberTexture);
function rememberTexture(texture, exception) {
if (exception) {
alert(exception);
} else {
g_textures[filename] = texture;
}
}
}
function initStep3() {
var redMaterial = o3djs.material.createBasicMaterial(
g_pack,
g_viewInfo,
[0.2, 1, 0.2, 1]); // green
var checkerMaterial = o3djs.material.createCheckerMaterial(g_pack,
g_viewInfo);
var billboardMaterial = o3djs.material.createMaterialFromFile(
g_pack, '../shaders/billboard-glsl.shader', g_viewInfo.zOrderedDrawList);
var imposterMaterial = o3djs.material.createMaterialFromFile(
g_pack, '../shaders/imposter-glsl.shader', g_viewInfo.zOrderedDrawList);
// Set the textures.
var sampler = g_pack.createObject('Sampler');
sampler.texture = g_textures['purple-flower.png'];
sampler.addressModeU = g_o3d.Sampler.CLAMP;
sampler.addressModeV = g_o3d.Sampler.CLAMP;
billboardMaterial.getParam('texSampler0').value = sampler;
var sampler2 = g_pack.createObject('Sampler');
sampler2.texture = g_textures['pillar.png'];
sampler2.addressModeU = g_o3d.Sampler.CLAMP;
sampler2.addressModeV = g_o3d.Sampler.CLAMP;
imposterMaterial.getParam('texSampler0').value = sampler2;
// Create and bind standard params so we can see the light parameters
// for the standard shaders globably.
g_globalParams = o3djs.material.createAndBindStandardParams(g_pack);
g_globalParams.lightWorldPos.value = [30, 60, 40];
g_globalParams.lightColor.value = [1, 1, 1, 1];
// Create a ground plane.
var shape = o3djs.primitives.createPlane(
g_pack, checkerMaterial, 100, 100, 10, 10);
// Put on a transform.
var transform = g_pack.createObject('Transform');
transform.parent = g_root;
transform.addShape(shape);
// Create a cylinder.
var cylinderShape = o3djs.primitives.createCylinder(
g_pack, redMaterial, 0.5, 5, 20, 1,
g_math.matrix4.translation([0, 2.5, 0]));
// Create an XY plane for the billboard.
var purpleFlowerPlane = o3djs.primitives.createPlane(
g_pack, billboardMaterial, 5, 5, 1, 1,
g_math.matrix4.rotationX(g_math.degToRad(90)));
// Create an XY plane for the imposter.
var pillarPlane = o3djs.primitives.createPlane(
g_pack, imposterMaterial, 5, 5, 1, 1,
g_math.matrix4.rotationX(g_math.degToRad(90)));
// Create 30 cylinders and put a billboard or imposter on top of each one.
for (var ii = 0; ii < 30; ++ii) {
transform = g_pack.createObject('Transform');
transform.parent = g_root;
transform.translate((g_math.pseudoRandom() - 0.5) * 90,
0,
(g_math.pseudoRandom() - 0.5) * 90);
transform.addShape(cylinderShape);
var topTransform = g_pack.createObject('Transform');
topTransform.parent = transform;
topTransform.translate(0, 7, 0);
if (ii % 4 > 1) {
topTransform.addShape(purpleFlowerPlane);
} else {
topTransform.addShape(pillarPlane);
}
}
// Setup a render callback for per frame processing.
g_client.setRenderCallback(onRender);
g_finished = true; // for selenium testing.
}
/**
* Called every frame.
* @param {!o3d.RenderEvent} renderEvent Rendering Information.
*/
function onRender(renderEvent) {
var elapsedTime = renderEvent.elapsedTime;
g_clock += elapsedTime * g_timeMult;
var eye = [
Math.sin(g_clock * g_cameraSpeed) * g_cameraRadius,
20 + 10 * Math.sin(g_clock * g_cameraSpeed * 4),
Math.cos(g_clock * g_cameraSpeed) * g_cameraRadius];
g_viewInfo.drawContext.view = g_math.matrix4.lookAt(
eye,
[0, 0, 0], // target
[0, 1, 0]); // up
};
/**
* 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>
<h1>Billboards</h1>
<div>
Flowers always face the camera.<br/>
Pillars rotate around Y toward the camera.
</div>
<div id="o3d" style="width: 800px; height: 600px;"></div>
</body>
</html>