<div class="refentry" title="glCullFace"><a id="glCullFace"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glCullFace — specify whether front- or back-facing polygons are

culled</p></div><div class="refsynopsisdiv" title="C Specification"><h2>C Specification</h2><div class="funcsynopsis"><table class="funcprototype-table"><tr><td><code class="funcdef">void <b class="fsfunc">glCullFace</b>(</code></td><td>GLenum <var class="pdparam">mode</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Parameters"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl><dt><span class="term">

<em class="parameter"><code>mode</code></em>

</span></dt><dd><p>Specifies whether front- or back-facing polygons are

culled. Symbolic constants

<code class="constant">GL_FRONT</code>,

<code class="constant">GL_BACK</code>, and

<code class="constant">GL_FRONT_AND_BACK</code>

are accepted. The initial value is

<code class="constant">GL_BACK</code>.</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="description"></a><h2>Description</h2><p>

<code class="function">glCullFace</code>

specifies whether front- or back-facing polygons are culled (as

specified by <em class="parameter"><code>mode</code></em>)

when culling is enabled.

To enable and disable culling, call

<a class="citerefentry" href="glEnable"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a>

and

<a class="citerefentry" href="glDisable"><span class="citerefentry"><span class="refentrytitle">glDisable</span></span></a>

with argument <code class="constant">GL_CULL_FACE</code>.

Culling is initially disabled.

</p><p>

<a class="citerefentry" href="glFrontFace"><span class="citerefentry"><span class="refentrytitle">glFrontFace</span></span></a>

specifies which of the clockwise and counterclockwise polygons

are front-facing and back-facing.</p></div><div class="refsect1" title="Notes"><a id="notes"></a><h2>Notes</h2><p>If <em class="parameter"><code>mode</code></em> is

<code class="constant">GL_FRONT_AND_BACK</code>,

no polygons are drawn, but other primitives such as points and

lines are drawn.</p></div><div class="refsect1" title="Errors"><a id="errors"></a><h2>Errors</h2><p><code class="constant">GL_INVALID_ENUM</code> is generated if

<em class="parameter"><code>mode</code></em> is not an accepted value.</p></div><div class="refsect1" title="Associated Gets"><a id="associatedgets"></a><h2>Associated Gets</h2><p>

<a class="citerefentry" href="glIsEnabled"><span class="citerefentry"><span class="refentrytitle">glIsEnabled</span></span></a> with argument <code class="constant">GL_CULL_FACE</code>

</p><p>

<a class="citerefentry" href="glGet"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_CULL_FACE_MODE</code>

</p></div><div class="refsect1" title="See Also"><a id="seealso"></a><h2>See Also</h2><p>

<a class="citerefentry" href="glEnable"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a>,

<a class="citerefentry" href="glFrontFace"><span class="citerefentry"><span class="refentrytitle">glFrontFace</span></span></a>

</p></div><div class="refsect1" title="Copyright"><a id="copyright"></a><h2>Copyright</h2><p>

Copyright © 2003-2004

Silicon Graphics, Inc. This document is licensed under the SGI

Free Software B License. For details, see

<a class="ulink" href="https://web.archive.org/web/20171022161616/http://oss.sgi.com/projects/FreeB/" target="_top">https://web.archive.org/web/20171022161616/http://oss.sgi.com/projects/FreeB/</a>.

</p></div></div>