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<!--
O3D Primitives
This sample shows how to use the functions in the primitives utility library
to make various shapes.
-->
<!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>
Primitives
</title>
<script type="text/javascript" src="o3djs/base.js"></script>
<script type="text/javascript">
o3djs.require('o3djs.util');
o3djs.require('o3djs.math');
o3djs.require('o3djs.rendergraph');
o3djs.require('o3djs.primitives');
o3djs.require('o3djs.effect');
// global variables
var g_o3dElement;
var g_client;
var g_o3d;
var g_math;
var g_pack;
var g_viewInfo;
var g_lightPosition = [5, 5, 7];
var g_eyePosition = [1, 3, 12];
/**
* Creates the client area.
*/
function initClient() {
window.g_finished = false; // for selenium testing.
// Runs the sample in V8. Comment out this line to run it in the browser
// JavaScript engine, for example if you want to debug it.
o3djs.util.setMainEngine(o3djs.util.Engine.V8);
o3djs.util.makeClients(main);
}
/**
* Initializes global variables, positions camera, draws shapes.
* @param {Array} clientElements Array of o3d object elements.
*/
function main(clientElements) {
// Init global variables.
initGlobals(clientElements);
// Set up the view and projection transformations.
initContext();
// Add the shapes to the transform heirarchy.
createShapes();
window.g_finished = true; // for selenium testing.
}
/**
* Initializes global variables and libraries.
*/
function initGlobals(clientElements) {
g_o3dElement = clientElements[0];
window.g_client = g_client = g_o3dElement.client;
g_o3d = g_o3dElement.o3d;
g_math = o3djs.math;
// Create a pack to manage the objects created.
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);
}
/**
* Sets up reasonable view and projection matrices.
*/
function initContext() {
// Set up a perspective transformation for the projection.
g_viewInfo.drawContext.projection = g_math.matrix4.perspective(
g_math.degToRad(30), // 30 degree frustum.
g_o3dElement.clientWidth / g_o3dElement.clientHeight, // Aspect ratio.
1, // Near plane.
5000); // Far plane.
// Set up our view transformation to look towards the world origin where the
// primitives are located.
g_viewInfo.drawContext.view = g_math.matrix4.lookAt(
g_eyePosition, // eye
[0, 0, 0], // target
[0, 1, 0]); // up
}
/**
* Creates a phong material based on the given single color.
* @param {Array} baseColor An array with 4 entries, the R,G,B, and A components
* of a color.
* @return {Material} A phong material whose overall pigment is baseColor.
*/
function createPhongMaterial(baseColor) {
// Create a new, empty Material object.
var material = g_pack.createObject('Material');
o3djs.effect.attachStandardShader(
g_pack, material, g_lightPosition, 'phong');
material.drawList = g_viewInfo.performanceDrawList;
// Assign parameters to the phong material.
material.getParam('emissive').value = [0, 0, 0, 1];
material.getParam('ambient').value = g_math.mulScalarVector(0.1, baseColor);
material.getParam('diffuse').value = g_math.mulScalarVector(0.9, baseColor);
material.getParam('specular').value = [.2, .2, .2, 1];
material.getParam('shininess').value = 20;
return material;
}
/**
* Creates shapes using the primitives utility library, and adds them to the
* transform graph at the root node.
*/
function createShapes() {
var cube = o3djs.primitives.createCube(
g_pack,
createPhongMaterial([0,1,0,1]), // A green phong-shaded material.
Math.sqrt(2)); // The length of each side of the cube.
var sphere = o3djs.primitives.createSphere(
g_pack,
createPhongMaterial([1,0,0,1]),
1.0, // Radius of the sphere.
30, // Number of meridians.
20); // Number of parallels.
var cylinder = o3djs.primitives.createCylinder(
g_pack,
createPhongMaterial([1,0,1,1]),
0.5, // Radius.
1.5, // Depth.
20, // Number of radial subdivisions.
20); // Number of vertical subdivisions.
var plane = o3djs.primitives.createPlane(
g_pack,
createPhongMaterial([0,1,1,1]),
1, // Width.
1.618, // Depth.
3, // Horizontal subdivisions.
3); // Vertical subdivisions.
// Make a polygon to extrude for the prism.
var polygon = [];
var n = 10;
for (var i = 0; i < n; ++i) {
var theta = 2.0 * i * Math.PI / n;
var radius = (i % 2) ? 1 : 0.382;
polygon.push([radius * Math.cos(theta), radius * Math.sin(theta)]);
}
var prism = o3djs.primitives.createPrism(
g_pack,
createPhongMaterial([1,1,0,1]),
polygon, // The profile polygon to be extruded.
1); // The depth of the extrusion.
var disc = o3djs.primitives.createDisc(
g_pack,
createPhongMaterial([1,0,0,1]),
1, // Radius.
7, // Divisions.
2, // Stacks (optional).
0, // Start Stack (optional).
2); // Stack Power (optional).
// Add the shapes to the transforms.
var transformTable = [
{shape: cube, translation: [-2, 1, 0]},
{shape: sphere, translation: [0, 1, 0]},
{shape: cylinder, translation: [2, 1, 0]},
{shape: plane, translation: [-2, -1, 0]},
{shape: prism, translation: [0, -1, 0]},
{shape: disc, translation: [2, -1, 0]}
];
for (var tt = 0; tt < transformTable.length; ++tt) {
var transform = g_pack.createObject('Transform');
transform.addShape(transformTable[tt].shape);
transform.translate(transformTable[tt].translation);
transform.parent = g_client.root;
}
}
</script>
</head>
<body onload="initClient()">
<h1>Primitives</h1>
This example shows how to use the primitives utility library to make various
shapes.
<br/>
<!-- Start of O3D plugin -->
<div id="o3d" style="width: 600px; height: 600px;"></div>
<!-- End of O3D plugin -->
</body>
</html>