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+'\" e
+'\"! eqn | mmdoc
+'\"macro stdmacro
+.ds Vn Version 1.2
+.ds Dt 6 March 1997
+.ds Re Release 1.2.0
+.ds Dp May 02 11:53
+.ds Dm 37 tessbegin
+.ds Xs 55678 4 tessbeginpolygon.gl
+.TH GLUTESSBEGINPOLYGON 3G
+.SH NAME
+.B "gluTessBeginPolygon
+\- delimit a polygon description
+
+.SH C SPECIFICATION
+void \f3gluTessBeginPolygon\fP(
+GLUtesselator* \fItess\fP,
+.nf
+.ta \w'\f3void \fPgluTessBeginPolygon( 'u
+	GLvoid* \fIdata\fP )
+.fi
+
+.EQ
+delim $$
+.EN
+.SH PARAMETERS
+.TP \w'\f2tess\fP\ \ 'u 
+\f2tess\fP
+Specifies the tessellation object (created with \%\f3gluNewTess\fP).
+.TP
+\f2data\fP
+Specifies a pointer to user polygon data.
+.SH DESCRIPTION
+\%\f3gluTessBeginPolygon\fP and \%\f3gluTessEndPolygon\fP delimit the definition of a
+convex, concave or self-intersecting polygon. Within each \%\f3gluTessBeginPolygon\fP/\%\f3gluTessEndPolygon\fP
+pair, there must be one or more calls to \%\f3gluTessBeginContour\fP/\%\f3gluTessEndContour\fP. 
+Within each contour, there are zero or more calls to \%\f3gluTessVertex\fP. The vertices 
+specify a closed contour (the last vertex of each contour is automatically linked 
+to the first). See the \%\f3gluTessVertex\fP, \%\f3gluTessBeginContour\fP, and 
+\%\f3gluTessEndContour\fP reference pages for more details.
+.P
+\f2data\fP is a pointer to a user-defined data structure. If the appropriate callback(s) 
+are specified (see \%\f3gluTessCallback\fP), then this pointer is returned to the 
+callback function(s). Thus, it is a convenient way to store per-polygon information.
+.P
+Once \%\f3gluTessEndPolygon\fP is called, the polygon is tessellated, and the
+resulting triangles are described through callbacks.
+See \%\f3gluTessCallback\fP for descriptions of the callback functions.
+.SH EXAMPLE
+A quadrilateral with a triangular hole in it can be described as follows:
+.sp
+.Ex
+gluTessBeginPolygon(tobj, NULL);
+ gluTessBeginContour(tobj);
+   gluTessVertex(tobj, v1, v1);
+   gluTessVertex(tobj, v2, v2);
+   gluTessVertex(tobj, v3, v3);
+   gluTessVertex(tobj, v4, v4);
+ gluTessEndContour(tobj);
+.bp
+ gluTessBeginContour(tobj);
+   gluTessVertex(tobj, v5, v5);
+   gluTessVertex(tobj, v6, v6);
+   gluTessVertex(tobj, v7, v7);
+ gluTessEndContour(tobj);
+gluTessEndPolygon(tobj);
+.Ee
+.sp
+.SH SEE ALSO
+\%\f3gluNewTess(3G)\fP, \%\f3gluTessBeginContour(3G)\fP, \%\f3gluTessVertex(3G)\fP, 
+\%\f3gluTessCallback(3G)\fP,
+\%\f3gluTessProperty(3G)\fP, \%\f3gluTessNormal(3G)\fP,
+\%\f3gluTessEndPolygon(3G)\fP