Files
Examples/Java/Processing/processing-3.3.6/modes/java/reference/perspective_.html
2018-04-20 10:15:15 +01:00

176 lines
7.7 KiB
HTML

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>perspective() \ Language (API) \ Processing 2+</title>
<link rel="icon" href="/favicon.ico" type="image/x-icon" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="Author" content="Processing Foundation" />
<meta name="Publisher" content="Processing Foundation" />
<meta name="Keywords" content="Processing, Sketchbook, Programming, Coding, Code, Art, Design" />
<meta name="Description" content="Processing is a flexible software sketchbook and a language for learning how to code within the context of the visual arts. Since 2001, Processing has promoted software literacy within the visual arts and visual literacy within technology." />
<meta name="Copyright" content="All contents copyright the Processing Foundation, Ben Fry, Casey Reas, and the MIT Media Laboratory" />
<script src="javascript/modernizr-2.6.2.touch.js" type="text/javascript"></script>
<link href="css/style.css" rel="stylesheet" type="text/css" />
</head>
<body id="Langauge-en" onload="" >
<!-- ==================================== PAGE ============================ -->
<div id="container">
<!-- ==================================== HEADER ============================ -->
<div id="ribbon">
<ul class="left">
<li class="highlight"><a href="http://processing.org/">Processing</a></li>
<li><a href="http://p5js.org/">p5.js</a></li>
<li><a href="http://py.processing.org/">Processing.py</a></li>
<li><a href="http://android.processing.org/">Processing for Android</a></li>
</ul>
<ul class="right">
<li><a href="https://processingfoundation.org/">Processing Foundation</a></li>
</ul>
<div class="clear"></div>
</div>
<div id="header">
<a href="/" title="Back to the Processing cover."><div class="processing-logo no-cover" alt="Processing cover"></div></a>
<form name="search" method="get" action="//www.google.com/search">
<p><input type="hidden" name="as_sitesearch" value="processing.org" />
<input type="text" name="as_q" value="" size="20" class="text" />
<input type="submit" value=" " /></p>
</form>
</div>
<a id="TOP" name="TOP"></a>
<div id="navigation">
<div class="navBar" id="mainnav">
<a href="index.html" class='active'>Language</a><br>
<a href="libraries/index.html" >Libraries</a><br>
<a href="tools/index.html">Tools</a><br>
<a href="environment/index.html">Environment</a><br>
</div>
<script> document.querySelectorAll(".processing-logo")[0].className = "processing-logo"; </script>
</div>
<!-- ==================================== CONTENT - Headers ============================ -->
<div class="content">
<p class="ref-notice">This reference is for Processing 3.0+. If you have a previous version, use the reference included with your software in the Help menu. If you see any errors or have suggestions, <a href="https://github.com/processing/processing-docs/issues?state=open">please let us know</a>. If you prefer a more technical reference, visit the <a href="http://processing.github.io/processing-javadocs/core/">Processing Core Javadoc</a> and <a href="http://processing.github.io/processing-javadocs/libraries/">Libraries Javadoc</a>.</p>
<table cellpadding="0" cellspacing="0" border="0" class="ref-item">
<tr class="name-row">
<th scope="row">Name</th>
<td><h3>perspective()</h3></td>
</tr>
<tr class="">
<tr class=""><th scope="row">Examples</th><td><div class="example"><img src="images/perspective_.png" alt="example pic" /><pre class="margin">
// Re-creates the default perspective
size(100, 100, P3D);
noFill();
float fov = PI/3.0;
float cameraZ = (height/2.0) / tan(fov/2.0);
perspective(fov, float(width)/float(height),
cameraZ/10.0, cameraZ*10.0);
translate(50, 50, 0);
rotateX(-PI/6);
rotateY(PI/3);
box(45);
</pre></div>
</td></tr>
<tr class="">
<th scope="row">Description</th>
<td>
Sets a perspective projection applying foreshortening, making distant objects appear smaller than closer ones. The parameters define a viewing volume with the shape of truncated pyramid. Objects near to the front of the volume appear their actual size, while farther objects appear smaller. This projection simulates the perspective of the world more accurately than orthographic projection. The version of perspective without parameters sets the default perspective and the version with four parameters allows the programmer to set the area precisely. The default values are: perspective(PI/3.0, width/height, cameraZ/10.0, cameraZ*10.0) where cameraZ is ((height/2.0) / tan(PI*60.0/360.0));
</td>
</tr>
<tr class=""><th scope="row">Syntax</th><td><pre>perspective()
perspective(<kbd>fovy</kbd>, <kbd>aspect</kbd>, <kbd>zNear</kbd>, <kbd>zFar</kbd>)</pre></td></tr>
<tr class=""> <th scope="row">Parameters</th><td><table cellpadding="0" cellspacing="0" border="0"><tr class="">
<th scope="row" class="code">fovy</th>
<td>float: field-of-view angle (in radians) for vertical direction</td>
</tr>
<tr class="">
<th scope="row" class="code">aspect</th>
<td>float: ratio of width to height</td>
</tr>
<tr class="">
<th scope="row" class="code">zNear</th>
<td>float: z-position of nearest clipping plane</td>
</tr>
<tr class="">
<th scope="row" class="code">zFar</th>
<td>float: z-position of farthest clipping plane</td>
</tr></table></td> </tr>
<tr class=""><th scope="row">Returns</th><td class="code">void</td></tr>
</table>
Updated on April 30, 2017 02:33:18pm EDT<br /><br />
<!-- Creative Commons License -->
<div class="license">
<a rel="license" href="//creativecommons.org/licenses/by-nc-sa/4.0/"><img alt="Creative Commons License" style="border: none" src="https://licensebuttons.net/l/by-nc-sa/4.0/88x31.png" /></a>
</div>
<!--
<?xpacket begin='' id=''?>
<x:xmpmeta xmlns:x='adobe:ns:meta/'>
<rdf:RDF xmlns:rdf='http://www.w3.org/1999/02/22-rdf-syntax-ns#'>
<rdf:Description rdf:about=''
xmlns:xapRights='http://ns.adobe.com/xap/1.0/rights/'>
<xapRights:Marked>True</xapRights:Marked>
</rdf:Description>
<rdf:Description rdf:about=''
xmlns:xapRights='http://ns.adobe.com/xap/1.0/rights/'
>
<xapRights:UsageTerms>
<rdf:Alt>
<rdf:li xml:lang='x-default' >This work is licensed under a &lt;a rel=&#34;license&#34; href=&#34;http://creativecommons.org/licenses/by-nc-sa/4.0/&#34;&gt;Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License&lt;/a&gt;.</rdf:li>
<rdf:li xml:lang='en' >This work is licensed under a &lt;a rel=&#34;license&#34; href=&#34;http://creativecommons.org/licenses/by-nc-sa/4.0/&#34;&gt;Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License&lt;/a&gt;.</rdf:li>
</rdf:Alt>
</xapRights:UsageTerms>
</rdf:Description>
<rdf:Description rdf:about=''
xmlns:cc='http://creativecommons.org/ns#'>
<cc:license rdf:resource='http://creativecommons.org/licenses/by-nc-sa/4.0/'/>
</rdf:Description>
</rdf:RDF>
</x:xmpmeta>
<?xpacket end='r'?>
-->
</div>
<!-- ==================================== FOOTER ============================ -->
<div id="footer">
<div id="copyright">Processing is an open project intiated by <a href="http://benfry.com/">Ben Fry</a> and <a href="http://reas.com">Casey Reas</a>. It is developed by a <a href="http://processing.org/about/people/">team of volunteers</a>.</div>
<div id="colophon">
<a href="copyright.html">&copy; Info</a>
</div>
</div>
</div>
<script src="javascript/jquery-1.9.1.min.js"></script>
<script src="javascript/site.js" type="text/javascript"></script>
</body>
</html>