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><head><title>glArrayElement</title><link rel="stylesheet" href="style.css" type="text/css"/><meta name="generator" content="DocBook XSL Stylesheets V1.59.1"/><link rel="home" href="index.xml" title="PyOpenGL 2.0.1.07 Man Pages"/><link rel="up" href="reference-GL.xml" title="GL"/><link rel="previous" href="glAreTexturesResident.3G.xml" title="glAreTexturesResident"/><link rel="next" href="glBegin.3G.xml" title="glBegin"/></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">glArrayElement</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="glAreTexturesResident.3G.xml">Prev</a></td><th width="60%" align="center">GL</th><td width="20%" align="right"><a accesskey="n" href="glBegin.3G.xml">Next</a></td></tr></table><hr/></div><div class="refentry" lang="en"><a name="glArrayElement.3G"/><div class="titlepage"/><div class="refnamediv"><a name="glArrayElement.3G-name"/><h2>Name</h2><p>glArrayElement — render a vertex using the specified vertex array element</p></div><div class="refsynopsisdiv"><a name="glArrayElement.3G-c_spec"/><h2>C Specification</h2><table class="funcprototype" border="0" cellpadding="0" cellspacing="0"><tr><td valign="top"><code>void<tt>glArrayElement</tt></code></td><td valign="top"><code>(</code></td><td valign="top"><code>GLint<i><tt>i</tt></i>);</code></td></tr></table></div><div class="refsynopsisdiv"><a name="glArrayElement.3G-python_spec"/><h2>Python Specification</h2><table class="funcprototype" border="0" cellpadding="0" cellspacing="0"><tr><td valign="top"><code><tt>glArrayElement</tt></code></td><td valign="top"><code>(</code></td><td valign="top"><code><i><tt>i</tt></i>) →<tt>None</tt></code></td></tr></table></div><div class="refsect1" lang="en"><a name="glArrayElement.3G-parameters"/><h2>Parameters</h2><div class="variablelist"><dl><dt><span class="term"><i><tt>i</tt></i></span></dt><dd>
Specifies an index into the enabled vertex data arrays.
</dd></dl></div></div><div class="refsect1" lang="en"><a name="glArrayElement.3G-description"/><h2>Description</h2><p>
<tt>glArrayElement</tt> commands are used within <a href="glBegin.3G.xml"><tt>glBegin</tt></a>/<a href="glBegin.3G.xml"><tt>glEnd</tt></a> pairs to specify vertex and attribute data for point, line, and polygon
primitives. If <tt>GL_VERTEX_ARRAY</tt> is enabled when <tt>glArrayElement</tt> is called, a
single vertex is drawn, using vertex and attribute data taken from location <i><tt>i</tt></i> of the enabled
arrays. If <tt>GL_VERTEX_ARRAY</tt> is not enabled, no drawing occurs but the attributes corresponding to
the enabled arrays are modified.
</p><p>
Use <tt>glArrayElement</tt> to construct primitives by indexing vertex data, rather than by streaming
through arrays of data in first-to-last order. Because each call specifies only a single vertex, it is possible to
explicitly specify per-primitive attributes such as a single normal per individual triangle.
</p><p>
Changes made to array data between the execution of <a href="glBegin.3G.xml"><tt>glBegin</tt></a> and the
corresponding execution of <a href="glBegin.3G.xml"><tt>glEnd</tt></a> may affect calls to
<tt>glArrayElement</tt> that are made within the same <a href="glBegin.3G.xml"><tt>glBegin</tt></a>/<a href="glBegin.3G.xml"><tt>glEnd</tt></a> period in non-sequential ways.
That is, a call to <tt>glArrayElement</tt> that precedes a change to array data may access the changed
data, and a call that follows a change to array data may access original data.
</p></div><div class="refsect1" lang="en"><a name="glArrayElement.3G-notes"/><h2>Notes</h2><p>
<tt>glArrayElement</tt> is available only if the GL version is 1.1 or greater.
</p><p>
<tt>glArrayElement</tt> is included in display lists. If <tt>glArrayElement</tt> is entered
into a display list, the necessary array data (determined by the array pointers and enables) is also entered into the
display list. Because the array pointers and enables are client-side state, their values affect display lists when the
lists are created, not when the lists are executed.
</p></div><div class="refsect1" lang="en"><a name="glArrayElement.3G-see_also"/><h2>See Also</h2><p>
<span class="simplelist"><a href="glClientActiveTextureARB.3G.xml">glClientActiveTextureARB</a>, <a href="glColorPointer.3G.xml">glColorPointer</a>, <a href="glDrawArrays.3G.xml">glDrawArrays</a>, <a href="glEdgeFlagPointer.3G.xml">glEdgeFlagPointer</a>, <a href="glGetPointerv.3G.xml">glGetPointerv</a>, <a href="glIndexPointer.3G.xml">glIndexPointer</a>, <a href="glInterleavedArrays.3G.xml">glInterleavedArrays</a>, <a href="glNormalPointer.3G.xml">glNormalPointer</a>, <a href="glTexCoordPointer.3G.xml">glTexCoordPointer</a>, <a href="glVertexPointer.3G.xml">glVertexPointer</a></span>
</p></div></div><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="glAreTexturesResident.3G.xml">Prev</a></td><td width="20%" align="center"><a accesskey="u" href="reference-GL.xml">Up</a></td><td width="40%" align="right"><a accesskey="n" href="glBegin.3G.xml">Next</a></td></tr><tr><td width="40%" align="left" valign="top">glAreTexturesResident</td><td width="20%" align="center"><a accesskey="h" href="index.xml">Home</a></td><td width="40%" align="right" valign="top">glBegin</td></tr></table></div></body></html>
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