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<?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>glNormal</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /></head><body><div class="refentry"><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"><h2>C Specification</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">void <strong class="fsfunc">glNormal3f</strong>(</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 border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">void <strong class="fsfunc">glNormal3x</strong>(</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"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl class="variablelist"><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"><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.xml"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a> and
        <a class="citerefentry" href="glDisable.xml"><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"><a id="associatedgets"></a><h2>Associated Gets</h2><p>
            <a class="citerefentry" href="glGet.xml"><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.xml"><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.xml"><span class="citerefentry"><span class="refentrytitle">glIsEnabled</span></span></a> with argument <code class="constant">GL_RESCALE_NORMAL</code>
        </p></div><div class="refsect1"><a id="seealso"></a><h2>See Also</h2><p>
        <a class="citerefentry" href="glColor.xml"><span class="citerefentry"><span class="refentrytitle">glColor</span></span></a>,
        <a class="citerefentry" href="glEnable.xml"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a>,
        <a class="citerefentry" href="glMultiTexCoord.xml"><span class="citerefentry"><span class="refentrytitle">glMultiTexCoord</span></span></a>,
        <a class="citerefentry" href="glNormalPointer.xml"><span class="citerefentry"><span class="refentrytitle">glNormalPointer</span></span></a>
        </p></div><div class="refsect1"><a id="copyright"></a><h2>Copyright</h2><p>
            Copyright <span class="trademark"></span>© 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></body></html>