gluTessBeginPolygon man page on DigitalUNIX

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gluTessBeginPolygon()					 gluTessBeginPolygon()

       gluTessBeginPolygon - delimit a polygon description

       void gluTessBeginPolygon(
	       GLUtesselator* tess,
	       GLvoid* data );

       Specifies  the tessellation object (created with gluNewTess()).	Speci‐
       fies a pointer to user polygon data.

       gluTessBeginPolygon() and gluTessEndPolygon() delimit the definition of
       a  convex, concave or self-intersecting polygon. Within each gluTessBe‐
       ginPolygon()/gluTessEndPolygon() pair, there must be one or more	 calls
       to   gluTessBeginContour()/gluTessEndContour().	Within	each  contour,
       there are zero or more calls to gluTessVertex(). The vertices specify a
       closed contour (the last vertex of each contour is automatically linked
       to the first).  See  the	 gluTessVertex(),  gluTessBeginContour(),  and
       gluTessEndContour() reference pages for more details.

       data  is a pointer to a user-defined data structure. If the appropriate
       callback(s) are specified (see gluTessCallback()), then this pointer is
       returned	 to  the callback function(s). Thus, it is a convenient way to
       store per-polygon information.

       Once gluTessEndPolygon() is called, the polygon is tessellated, and the
       resulting  triangles are described through callbacks.  See gluTessCall‐
       back() for descriptions of the callback functions.

       A quadrilateral with a triangular hole in it can be described  as  fol‐
       lows: gluTessBeginPolygon(tobj, NULL);
	   gluTessVertex(tobj, v1, v1);
	   gluTessVertex(tobj, v2, v2);
	   gluTessVertex(tobj, v3, v3);
	   gluTessVertex(tobj, v4, v4);
	   gluTessVertex(tobj, v5, v5);
	   gluTessVertex(tobj, v6, v6);
	   gluTessVertex(tobj, v7, v7);
	 gluTessEndContour(tobj); gluTessEndPolygon(tobj);

       gluNewTess(3),  gluTessBeginContour(3),	gluTessVertex(3), gluTessCall‐
       back(3), gluTessProperty(3), gluTessNormal(3), gluTessEndPolygon(3)


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