<div class="refentry" title="glNormal"><a id="glNormal"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glNormal — set the current normal vector</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">glNormal3f</b>(</code></td><td>GLfloat <var class="pdparam">nx</var>, </td></tr><tr><td> </td><td>GLfloat <var class="pdparam">ny</var>, </td></tr><tr><td> </td><td>GLfloat <var class="pdparam">nz</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div><table class="funcprototype-table"><tr><td><code class="funcdef">void <b class="fsfunc">glNormal3x</b>(</code></td><td>GLfixed <var class="pdparam">nx</var>, </td></tr><tr><td> </td><td>GLfixed <var class="pdparam">ny</var>, </td></tr><tr><td> </td><td>GLfixed <var class="pdparam">nz</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>nx</code></em>,

<em class="parameter"><code>ny</code></em>,

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

</span></dt><dd><p>Specify the

<em class="parameter"><code>x</code></em>,

<em class="parameter"><code>y</code></em>, and

<em class="parameter"><code>z</code></em> coordinates of the

new current normal. The initial value is (0, 0, 1).</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="description"></a><h2>Description</h2><p>The current normal is set to the given coordinates whenever

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

is issued.</p><p>Normals specified with <code class="function">glNormal</code>

need not have unit length. If <code class="constant">GL_NORMALIZE</code>

is enabled, then normals of any length specified with

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

are normalized after transformation. If

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

is enabled, normals are scaled by a scaling factor derived from

the modelview matrix. <code class="constant">GL_RESCALE_NORMAL</code>

requires that the originally specified normals were of unit

length, and that the modelview matrix contain only uniform

scales for proper results. To enable and disable normalization,

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 either

<code class="constant">GL_NORMALIZE</code> or <code class="constant">GL_RESCALE_NORMAL</code>.

Normalization is initially disabled.</p></div><div class="refsect1" title="Associated Gets"><a id="associatedgets"></a><h2>Associated Gets</h2><p>

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

</p><p>

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

</p><p>

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

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

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

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

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

<a class="citerefentry" href="glNormalPointer"><span class="citerefentry"><span class="refentrytitle">glNormalPointer</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="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>.

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