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3 <?xml-stylesheet type=
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pref=
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renderer=
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"text/html; charset=UTF-8" /><title>gluBeginPolygon
</title><meta name=
"generator" content=
"DocBook XSL Stylesheets V1.73.2" /></head><body><div class=
"refentry" lang=
"en" xml:
lang=
"en"><a id=
"gluBeginPolygon"></a><div class=
"titlepage"></div><div class=
"refnamediv"><h2>Name
</h2><p>gluBeginPolygon — delimit a polygon description
</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">gluBeginPolygon
</b>(
</code></td><td>GLUtesselator*
</td><td><var class=
"pdparam">tess
</var><code>)
</code>;
</td></tr></table></div></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">gluEndPolygon
</b>(
</code></td><td>GLUtesselator*
</td><td><var class=
"pdparam">tess
</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>tess
</code></em></span></dt><dd><p>
4 Specifies the tessellation object (created with
<a class=
"citerefentry" href=
"gluNewTess.xml"><span class=
"citerefentry"><span class=
"refentrytitle">gluNewTess
</span></span></a>).
5 </p></dd></dl></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"description"></a><h2>Description
</h2><p>
6 <code class=
"function">gluBeginPolygon
</code> and
<a class=
"citerefentry" href=
"gluEndPolygon.xml"><span class=
"citerefentry"><span class=
"refentrytitle">gluEndPolygon
</span></span></a> delimit the definition of a
8 To define such a polygon, first call
<code class=
"function">gluBeginPolygon
</code>.
9 Then define the contours of the polygon
11 <a class=
"citerefentry" href=
"gluTessVertex.xml"><span class=
"citerefentry"><span class=
"refentrytitle">gluTessVertex
</span></span></a> for each vertex
12 and
<a class=
"citerefentry" href=
"gluNextContour.xml"><span class=
"citerefentry"><span class=
"refentrytitle">gluNextContour
</span></span></a> to start each new contour.
13 Finally, call
<a class=
"citerefentry" href=
"gluEndPolygon.xml"><span class=
"citerefentry"><span class=
"refentrytitle">gluEndPolygon
</span></span></a>
14 to signal the end of the definition.
15 See the
<a class=
"citerefentry" href=
"gluTessVertex.xml"><span class=
"citerefentry"><span class=
"refentrytitle">gluTessVertex
</span></span></a> and
16 <a class=
"citerefentry" href=
"gluNextContour.xml"><span class=
"citerefentry"><span class=
"refentrytitle">gluNextContour
</span></span></a> reference pages for more details.
18 Once
<a class=
"citerefentry" href=
"gluEndPolygon.xml"><span class=
"citerefentry"><span class=
"refentrytitle">gluEndPolygon
</span></span></a> is called, the polygon is tessellated, and the
19 resulting triangles are described through callbacks.
20 See
<a class=
"citerefentry" href=
"gluTessCallback.xml"><span class=
"citerefentry"><span class=
"refentrytitle">gluTessCallback
</span></span></a> for descriptions of the callback functions.
21 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"notes"></a><h2>Notes
</h2><p>
22 This command is obsolete and is provided for backward compatibility
23 only. Calls to
<code class=
"function">gluBeginPolygon
</code> are mapped to
24 <a class=
"citerefentry" href=
"gluTessBeginPolygon.xml"><span class=
"citerefentry"><span class=
"refentrytitle">gluTessBeginPolygon
</span></span></a>
26 <a class=
"citerefentry" href=
"gluTessBeginContour.xml"><span class=
"citerefentry"><span class=
"refentrytitle">gluTessBeginContour
</span></span></a>. Calls to
<a class=
"citerefentry" href=
"gluEndPolygon.xml"><span class=
"citerefentry"><span class=
"refentrytitle">gluEndPolygon
</span></span></a> are mapped
27 to
<a class=
"citerefentry" href=
"gluTessEndContour.xml"><span class=
"citerefentry"><span class=
"refentrytitle">gluTessEndContour
</span></span></a> followed by
<a class=
"citerefentry" href=
"gluTessEndPolygon.xml"><span class=
"citerefentry"><span class=
"refentrytitle">gluTessEndPolygon
</span></span></a>.
28 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"example"></a><h2>Example
</h2><p>
29 A quadrilateral with a triangular hole in it can be described like this:
30 </p><pre class=
"programlisting">
31 gluBeginPolygon(tobj);
32 gluTessVertex(tobj, v1, v1);
33 gluTessVertex(tobj, v2, v2);
34 gluTessVertex(tobj, v3, v3);
35 gluTessVertex(tobj, v4, v4);
36 gluNextContour(tobj, GLU_INTERIOR);
37 gluTessVertex(tobj, v5, v5);
38 gluTessVertex(tobj, v6, v6);
39 gluTessVertex(tobj, v7, v7);
42 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"seealso"></a><h2>See Also
</h2><p>
43 <a class=
"citerefentry" href=
"gluNewTess.xml"><span class=
"citerefentry"><span class=
"refentrytitle">gluNewTess
</span></span></a>,
44 <a class=
"citerefentry" href=
"gluNextContour.xml"><span class=
"citerefentry"><span class=
"refentrytitle">gluNextContour
</span></span></a>,
45 <a class=
"citerefentry" href=
"gluTessBeginContour.xml"><span class=
"citerefentry"><span class=
"refentrytitle">gluTessBeginContour
</span></span></a>,
46 <a class=
"citerefentry" href=
"gluTessBeginPolygon.xml"><span class=
"citerefentry"><span class=
"refentrytitle">gluTessBeginPolygon
</span></span></a>,
47 <a class=
"citerefentry" href=
"gluTessCallback.xml"><span class=
"citerefentry"><span class=
"refentrytitle">gluTessCallback
</span></span></a>,
48 <a class=
"citerefentry" href=
"gluTessVertex.xml"><span class=
"citerefentry"><span class=
"refentrytitle">gluTessVertex
</span></span></a>
49 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"Copyright"></a><h2>Copyright
</h2><p>
50 Copyright
<span class=
"trademark"></span>©
1991-
2006
51 Silicon Graphics, Inc. This document is licensed under the SGI
52 Free Software B License. For details, see
53 <a class=
"ulink" href=
"http://oss.sgi.com/projects/FreeB/" target=
"_top">http://oss.sgi.com/projects/FreeB/
</a>.
54 </p></div></div></body></html>