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1 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "xhtml1-transitional.dtd"> |
2 | <!-- saved from url=(0013)about:internet --> | |
3 | <?xml-stylesheet type="text/xsl" href="mathml.xsl"?><html xmlns="http://www.w3.org/1999/xhtml" xmlns:pref="http://www.w3.org/2002/Math/preference" pref:renderer="mathplayer-dl"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>glGetClipPlane</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="glGetClipPlane"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glGetClipPlane — return the coefficients of the specified clipping plane</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr><td><code class="funcdef">void <b class="fsfunc">glGetClipPlane</b>(</code></td><td>GLenum </td><td><var class="pdparam">plane</var>, </td></tr><tr><td> </td><td>GLdouble * </td><td><var class="pdparam">equation</var><code>)</code>;</td></tr></table></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>plane</code></em></span></dt><dd><p> | |
4 | Specifies a clipping plane. | |
5 | The number of clipping planes depends on the implementation, | |
6 | but at least six clipping planes are supported. | |
7 | They are identified by symbolic names of the form <code class="constant">GL_CLIP_PLANE</code> | |
8 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">i</mml:mi></mml:math> | |
9 | where i ranges from 0 to the value of <code class="constant">GL_MAX_CLIP_PLANES</code> - 1. | |
10 | </p></dd><dt><span class="term"><em class="parameter"><code>equation</code></em></span></dt><dd><p> | |
11 | Returns four double-precision values that are the coefficients of the plane equation of <em class="parameter"><code>plane</code></em> in eye coordinates. | |
12 | The initial value is (0, 0, 0, 0). | |
13 | </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p> | |
14 | <code class="function">glGetClipPlane</code> returns in <em class="parameter"><code>equation</code></em> the four coefficients of the plane equation | |
15 | for <em class="parameter"><code>plane</code></em>. | |
16 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="notes"></a><h2>Notes</h2><p> | |
17 | It is always the case that <code class="constant">GL_CLIP_PLANE</code> | |
18 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">i</mml:mi></mml:math> | |
19 | = <code class="constant">GL_CLIP_PLANE0</code> + | |
20 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">i</mml:mi></mml:math>. | |
21 | </p><p> | |
22 | If an error is generated, | |
23 | no change is made to the contents of <em class="parameter"><code>equation</code></em>. | |
24 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p> | |
25 | <code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>plane</code></em> is not an accepted value. | |
26 | </p><p> | |
27 | <code class="constant">GL_INVALID_OPERATION</code> is generated if <code class="function">glGetClipPlane</code> | |
28 | is executed between the execution of <a class="citerefentry" href="glBegin.xml"><span class="citerefentry"><span class="refentrytitle">glBegin</span></span></a> | |
29 | and the corresponding execution of <a class="citerefentry" href="glEnd.xml"><span class="citerefentry"><span class="refentrytitle">glEnd</span></span></a>. | |
30 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p> | |
31 | <a class="citerefentry" href="glClipPlane.xml"><span class="citerefentry"><span class="refentrytitle">glClipPlane</span></span></a> | |
32 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p> | |
33 | Copyright <span class="trademark"></span>© 1991-2006 | |
34 | Silicon Graphics, Inc. This document is licensed under the SGI | |
35 | Free Software B License. For details, see | |
36 | <a class="ulink" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>. | |
37 | </p></div></div></body></html> |