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procedural-texture.html
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/
procedural-texture.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 Tutorial
In this tutorial, we load and display a scene in O3D and then
apply a procedural texture to it.
-->
<!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>
Applying a Procedural Texture to a scene
</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.rendergraph');
o3djs.require('o3djs.pack');
o3djs.require('o3djs.camera');
o3djs.require('o3djs.scene');
// Events
// init() once the page has finished loading.
window.onload = init;
// global variables
var g_o3d;
var g_client;
var g_viewInfo;
var g_pack;
var g_finished = false; // for selenium testing
/**
* Loads a scene into the transform graph.
* @param {!o3d.Pack} pack Pack to load scene into.
* @param {string} fileName filename of the scene.
* @param {!o3d.Transform} parent parent node in the transform graph to
* which to load the scene into.
*/
function loadScene(pack, fileName, parent) {
// Get our full path to the scene
var scenePath = o3djs.util.getCurrentURI() + fileName;
// Load the file given the full path, and call the callback function
// when its done loading.
o3djs.scene.loadScene(g_client, pack, parent, scenePath, callback);
/**
* Our callback is called once the scene has been loaded into memory
* from the web or locally.
* @param {!o3d.Pack} pack The pack that was passed in above.
* @param {!o3d.Transform} parent The parent that was passed in above.
* @param {*} exception null if loading succeeded.
*/
function callback(pack, parent, exception) {
if (exception) {
alert('Could not load: ' + fileName + '\n' + exception);
return;
}
// Get a CameraInfo (an object with a view and projection matrix)
// using our javascript library function
var cameraInfo = o3djs.camera.getViewAndProjectionFromCameras(
parent,
g_client.width,
g_client.height);
// Copy the view and projection to the draw context.
g_viewInfo.drawContext.view = cameraInfo.view;
g_viewInfo.drawContext.projection = cameraInfo.projection;
// Add our checker pattern
createCheckerBoard(pack, 'Material__26');
// Generate draw elements and setup material draw lists.
o3djs.pack.preparePack(pack, g_viewInfo);
g_finished = true; // for selenium testing.
}
}
/**
* In order to apply the texture you must know the material name which you wish
* to change. The bulk of the calculation takes place in the shader itself.
* Alternatively, you could change the first or all the materials if you don't
* know the material name.
* @param {!o3d.Pack} pack The pack the scene was loaded into.
* @param {string} materialName Name of material you wish to turn into checkers.
*/
function createCheckerBoard(pack, materialName) {
var effectString = document.getElementById('checkerShader').value;
var effect = g_pack.createObject('Effect');
effect.loadFromFXString(effectString);
var materials = pack.getObjects(materialName, 'o3d.Material');
for (var m = 0; m < materials.length; m++) {
var material = materials[m];
// Set the material to use the checker effect.
material.effect = effect;
// Create any parameters the effect needs on the material.
effect.createUniformParameters(material);
}
}
/**
* Creates the client area.
*/
function init() {
o3djs.webgl.makeClients(initStep2);
}
/**
* Initializes O3D and loads the scene into the transform graph.
* @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_client = o3dElement.client;
// Creates a pack to manage our resources/assets
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);
// Creates a transform to put our data on.
var myDataRoot = g_pack.createObject('Transform');
// Connects our root to the client's root.
myDataRoot.parent = g_client.root;
// Load the scene into the transform graph as a child myDataRoot
loadScene(g_pack, '../assets/teapot/scene.json', myDataRoot);
}
</script>
</head>
<body>
<h1>Applying a Procedural Texture to a scene</h1>
This tutorial shows how to apply a procedural texture to a scene.
<br/>
<!-- Start of O3D plugin -->
<div id="o3d" style="width: 600px; height: 600px;"></div>
<!-- End of O3D plugin -->
<!-- Don't render the textarea -->
<textarea id="checkerShader" style="display: none;">
// The 4x4 world view projection matrix.
uniform mat4 worldViewProjection;
// input parameters for our vertex shader
attribute vec4 position;
attribute vec3 normal;
attribute vec2 texCoord0;
// input parameters for our pixel shader
varying vec4 col;
varying vec2 texcoord;
/**
* Our vertex shader. In the vertex shader, we calculate the lighting.
* Then we'll combine it with our checker pattern in the pixel shader.
*/
void main() {
gl_Position = worldViewProjection * position;
/**
* lightVector - light vector
* normal - normal vector
* We put the light such that it illuminates our model.
*/
vec4 diffuseColor = vec4(1, 1, 1, 1);
vec3 lightPos = vec3(1000, -1000, 1000);
vec3 lightVector = normalize(lightPos - position.xyz);
vec3 normal = normalize(normal);
vec4 diffuse = dot(normal, lightVector) * diffuseColor;
col = diffuse;
texcoord = texCoord0;
}
// #o3d SplitMarker
// function for getting the checker pattern
vec4 checker(vec2 uv) {
float checkSize = 4.0;
float fmodResult = mod(floor(checkSize * uv.x) + floor(checkSize * uv.y),
2.0);
if (fmodResult < 1.0) {
return vec4(0, 1, 1, 1);
} else {
return vec4(1, 0, 1, 1);
}
}
// input parameters for our pixel shader
varying vec4 col;
varying vec2 texcoord;
/**
* Our pixel shader. We take the lighting color we got from the vertex sahder
* and combine it with our checker pattern.
*/
void main() {
vec4 check = checker(texcoord);
vec4 color = col * check;
gl_FragColor = color;
}
// #o3d MatrixLoadOrder RowMajor
</textarea>
</body>
</html>