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primitives.html
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primitives.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 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="../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.math');
o3djs.require('o3djs.rendergraph');
o3djs.require('o3djs.primitives');
o3djs.require('o3djs.material');
// global variables
var g_o3dElement;
var g_client;
var g_o3d;
var g_math;
var g_pack;
var g_viewInfo;
var g_eyePosition = [3, 4, 14];
/**
* Creates the client area.
*/
function initClient() {
window.g_finished = false; // for selenium testing.
o3djs.webgl.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 material based on the given single color.
* @param {!o3djs.math.Vector4} baseColor A 4-component vector with
* the R,G,B, and A components of a color.
* @return {!o3d.Material} A phong material whose overall pigment is
* baseColor.
*/
function createMaterial(baseColor) {
// Create a new, empty Material object.
return o3djs.material.createBasicMaterial(g_pack, g_viewInfo, baseColor);
}
/**
* 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,
createMaterial([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,
createMaterial([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,
createMaterial([1,0,1,1]),
0.5, // Radius.
1.5, // Height.
20, // Number of radial subdivisions.
20); // Number of vertical subdivisions.
var truncatedCone = o3djs.primitives.createTruncatedCone(
g_pack,
createMaterial([0,0,1,1]),
0.3, // Bottom radius.
0.5, // Top radius.
1.5, // Height.
20, // Number of radial subdivisions.
20); // Number of vertical subdivisions.
var cone = o3djs.primitives.createTruncatedCone(
g_pack,
createMaterial([0,1,0,1]),
0.5, // Bottom radius.
0.0, // Top radius.
1.5, // Height.
20, // Number of radial subdivisions.
20); // Number of vertical subdivisions.
var plane = o3djs.primitives.createPlane(
g_pack,
createMaterial([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,
createMaterial([1,1,0,1]),
polygon, // The profile polygon to be extruded.
1); // The depth of the extrusion.
var disc = o3djs.primitives.createDisc(
g_pack,
createMaterial([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: [-3, 1, 0]},
{shape: sphere, translation: [-1, 1, 0]},
{shape: cylinder, translation: [1, 1, 0]},
{shape: truncatedCone, translation: [3, 1, 0]},
{shape: plane, translation: [-3, -1, 0]},
{shape: prism, translation: [-1, -1, 0]},
{shape: disc, translation: [1, -1, 0]},
{shape: cone, translation: [3, -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>