168 lines
7.5 KiB
HTML
168 lines
7.5 KiB
HTML
<!DOCTYPE html>
|
|
<html>
|
|
<head>
|
|
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
|
|
<title>lightFalloff() | reference | Processing.js</title>
|
|
<link rel="stylesheet" href="../../css/bootstrap.css" type="text/css" />
|
|
<link rel="stylesheet" href="../../css/syntax.css" type="text/css" />
|
|
<link rel="stylesheet" href="../../css/processing-js.css" type="text/css" />
|
|
<script src="../../js/processing.min.js" type="text/javascript"></script>
|
|
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js" type="text/javascript"></script>
|
|
<script src="../../js/jquery.tweet.min.js" type="text/javascript"></script>
|
|
<script src="../../js/tabselector.js" type="text/javascript"></script>
|
|
<script src="http://cdn.webglstats.com/stat.js" defer="defer" async="async"></script>
|
|
<script type="text/javascript">
|
|
// Only do tracking on the actual site
|
|
if (document.location.host === "processingjs.org") {
|
|
var _gaq = _gaq || [];
|
|
_gaq.push(['_setAccount', 'UA-8565070-1']);
|
|
_gaq.push(['_trackPageview']);
|
|
(function() {
|
|
var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
|
|
ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
|
|
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
|
|
}());
|
|
}
|
|
</script>
|
|
</head>
|
|
<body>
|
|
<div class="container">
|
|
<div class="header">
|
|
<a href="http://processingjs.org/"><img src="../../images/header.png" width="177" height="42"></a>
|
|
</div>
|
|
<span class="tagline">a port of the Processing Visualization Language</span>
|
|
|
|
<div class="navbar">
|
|
<canvas width="940px" height="78px" data-processing-sources="/sketches/bannerSketch.pde"></canvas>
|
|
<ul>
|
|
<li><a href="http://processingjs.org/"><span>home</span></a></li>
|
|
<li><a href="http://processingjs.org/download/"><span>download</span></a></li>
|
|
<li><a href="../index.html"><span>reference</span></a></li>
|
|
<li><a href="http://processingjs.org/exhibition/"><span>exhibition</span></a></li>
|
|
<li><a href="http://processingjs.org/learning/"><span>learning</span></a></li>
|
|
<li><a href="http://processingjs.org/articles/"><span>articles</span></a></li>
|
|
<li><a href="http://processingjs.org/community/"><span>community</span></a></li>
|
|
<li><a href="http://processingjs.org/blog/"><span>blog</span></a></li>
|
|
</ul>
|
|
<a class="viewsource" href="http://processingjs.org/sketches/bannerSketch.pde">view source</a>
|
|
</div>
|
|
|
|
<div class="page row">
|
|
<div class="span11">
|
|
<table cellpadding="0" cellspacing="0" border="0" class="ref-item">
|
|
<tr class="name-row">
|
|
<th scope="row">Name</th>
|
|
<td><h3>lightFalloff()</h3></td>
|
|
|
|
</tr>
|
|
|
|
<tr class="">
|
|
<th scope="row">Description</th>
|
|
|
|
<td><p>Sets the falloff rates for point lights, spot lights, and ambient lights. The parameters are used to determine the falloff with the following equation:</p>
|
|
<p>d = distance from light position to vertex position<br />
|
|
falloff = 1 / (CONSTANT + d * LINEAR + (d*d) * QUADRATIC)</p><p>Like <b>fill()</b>, it affects only the elements which are created after it in the code.
|
|
The default value if <b>LightFalloff(1.0, 0.0, 0.0)</b>. Thinking about an ambient light with a falloff can be tricky.
|
|
It is used, for example, if you wanted a region of your scene to be lit ambiently one color and another region to be lit ambiently by another color,
|
|
you would use an ambient light with location and falloff. You can think of it as a point light that doesn't care which direction a surface is facing.</p></td>
|
|
</tr>
|
|
|
|
<tr class="">
|
|
<th scope="row">Syntax</th>
|
|
<td><pre>lightFalloff(<kbd>constant</kbd>,<kbd>linear</kbd>,<kbd>quadratic</kbd>)</pre></td>
|
|
</tr>
|
|
|
|
<tr class="">
|
|
<th scope="row">Parameters</th>
|
|
<td><table cellpadding="0" cellspacing="0" border="0">
|
|
<tr class="">
|
|
<th scope="row">constant</th>
|
|
<td>int or float: constant value for determining falloff</td>
|
|
</tr>
|
|
<tr class="">
|
|
<th scope="row">linear</th>
|
|
<td>int or float: linear value for determining falloff</td>
|
|
</tr>
|
|
<tr class="">
|
|
<th scope="row">quadratic</th>
|
|
<td>int or float: quadratic value for determining falloff</td>
|
|
</tr>
|
|
</table></td>
|
|
|
|
</tr>
|
|
<tr class="">
|
|
<th scope="row">Returns</th>
|
|
<td>None</td>
|
|
</tr>
|
|
<tr class="">
|
|
<th scope="row">Usage</th>
|
|
<td>Web & Application</td>
|
|
</tr>
|
|
|
|
<tr class="">
|
|
|
|
<th scope="row">Related</th>
|
|
<td><a href="../lights_.1">lights()</a><br />
|
|
<a href="../ambientLight_.1">ambientLight()</a><br />
|
|
<a href="../pointLight_.1">pointLight()</a><br />
|
|
<a href="../spotLight_.1">spotLight()</a><br />
|
|
<a href="../lightSpecular_.1">lightSpecular()</a><br /></td>
|
|
</tr>
|
|
</table>
|
|
|
|
<div class="cclicense">
|
|
<p>This reference is licensed under the CC BY-NC-SA 2.0 license:</p>
|
|
<a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/2.0/">
|
|
<img alt="Creative Commons License" border="0" src="../../images/somerights20.gif" />
|
|
</a>
|
|
</div>
|
|
</div>
|
|
<div class="sidebar span4">
|
|
<h3><a href="http://processingjs.org/download/">Downloads</a></h3>
|
|
<ul>
|
|
<li><a href="http://processingjs.org/download/">Download the latest version of Processing.js!</a></li>
|
|
</ul>
|
|
|
|
<h3><a href="http://processingjs.org/articles/">Articles</a></h3>
|
|
<ul>
|
|
<li><a href="http://processingjs.org/articles/jsQuickStart.html">Quick Start - JavaScript Developer</a></li>
|
|
<li><a href="http://processingjs.org/articles/p5QuickStart.html">Quick Start - Processing Developer</a></li>
|
|
<li><a href="http://processingjs.org/articles/RenderingModes.html">Rendering Modes</a></li>
|
|
<li><a href="http://processingjs.org/articles/PomaxGuide.html">Pomax's Guide to processing-js</a></li>
|
|
</ul>
|
|
|
|
<h3><a>Web IDEs</a></h3>
|
|
<ul>
|
|
<li><a href="http://sketchpad.cc">Sketchpad.cc</a></li>
|
|
<li><a href="http://processingjs.org/tools/processing-helper.html">Processing.js Helper</a></li>
|
|
<li><a href="http://www.openprocessing.org">OpenProcessing.org</a></li>
|
|
</ul>
|
|
|
|
<h3><a href="http://processingjs.org/community/">Community</a></h3>
|
|
<ul>
|
|
<li><a href="irc://irc.mozilla.org/processing.js">IRC Channel</a></li>
|
|
<li><a href="http://processing-js.lighthouseapp.com/">Bug Tracker</a></li>
|
|
<li><a href="http://github.com/processing-js/processing-js/">Github Repository</a></li>
|
|
<li><a href="http://groups.google.com/group/processingjs">Google Group</a></li>
|
|
<li><a href="http://zenit.senecac.on.ca/wiki/index.php/">Open Source @ Seneca</a></li>
|
|
</ul>
|
|
|
|
<h3><a href="http://twitter.com/processingjs">Twitter Feed</a></h3>
|
|
<div class="twitter"></div>
|
|
</div>
|
|
</div>
|
|
|
|
<div class="footer">
|
|
Processing is an open visualization language developed by
|
|
<a href="http://benfry.com/">Ben Fry</a> & <a href="http://reas.com/">Casey Reas</a>,
|
|
and originally ported to Javascript by
|
|
<a href="http://ejohn.org/blog/processingjs/">John Resig</a>.
|
|
Processing.js is maintained by the Processing.js team.
|
|
</div>
|
|
</div>
|
|
<a href="http://github.com/processing-js/processing-js/">
|
|
<img style="position: absolute; top: 0; right: 0; border: 0;" src="../../images/forkme-right-orange.png" alt="Fork me on GitHub">
|
|
</a>
|
|
</body>
|
|
</html>
|