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<HTML><BODY><PRE>     <STRONG>NAME</STRONG>	  <STRONG>fgluTessBeginPolygon</STRONG> - delimit a polygon description     <STRONG>FORTRAN</STRONG> <STRONG>SPECIFICATION</STRONG>	  SUBROUTINE <STRONG>fgluTessBeginPolygon</STRONG>( CHARACTER*8 <EM>tess</EM>,					   CHARACTER*8 <EM>data</EM> )     <STRONG>PARAMETERS</STRONG>	  <EM>tess</EM>	Specifies the tessellation object (created with		<STRONG>fgluNewTess</STRONG>).	  <EM>data</EM>	Specifies a pointer to user polygon data.     <STRONG>DESCRIPTION</STRONG>	  <STRONG>fgluTessBeginPolygon</STRONG> and <STRONG>fgluTessEndPolygon</STRONG> delimit the	  definition of	a convex, concave or self-intersecting	  polygon. Within each <STRONG>fgluTessBeginPolygon</STRONG>/<STRONG>fgluTessEndPolygon</STRONG>	  pair,	there must be one or more calls	to	  <STRONG>fgluTessBeginContour</STRONG>/<STRONG>fgluTessEndContour</STRONG>. Within each	  contour, there are zero or more calls	to <STRONG>fgluTessVertex</STRONG>. The	  vertices specify a closed contour (the last vertex of	each	  contour is automatically linked to the first). See the	  <STRONG>fgluTessVertex</STRONG>, <STRONG>fgluTessBeginContour</STRONG>,	and <STRONG>fgluTessEndContour</STRONG>	  reference pages for more details.	  <EM>data</EM> is a pointer to a user-defined data structure. If the	  appropriate callback(s) are specified	(see	  <STRONG>fgluTessCallback</STRONG>), then this pointer is returned to the	  callback function(s).	Thus, it is a convenient way to	store	  per-polygon information.	  Once <STRONG>fgluTessEndPolygon</STRONG> is called, the polygon is	  tessellated, and the resulting triangles are described	  through callbacks.  See <STRONG>fgluTessCallback</STRONG> for descriptions of	  the callback functions.     <STRONG>EXAMPLE</STRONG>	  A quadrilateral with a triangular hole in it can be	  described as follows:	  gluTessBeginPolygon(tobj, NULL);	   gluTessBeginContour(tobj);	     gluTessVertex(tobj, v1, v1);	     gluTessVertex(tobj, v2, v2);	     gluTessVertex(tobj, v3, v3);	     gluTessVertex(tobj, v4, v4);	   gluTessEndContour(tobj);	   gluTessBeginContour(tobj);	     gluTessVertex(tobj, v5, v5);	     gluTessVertex(tobj, v6, v6);	     gluTessVertex(tobj, v7, v7);	   gluTessEndContour(tobj); gluTessEndPolygon(tobj);     <STRONG>SEE</STRONG> <STRONG>ALSO</STRONG>	  <STRONG>fgluNewTess</STRONG>, <STRONG>fgluTessBeginContour</STRONG>, <STRONG>fgluTessVertex</STRONG>,	  <STRONG>fgluTessCallback</STRONG>, <STRONG>fgluTessProperty</STRONG>, <STRONG>fgluTessNormal</STRONG>,	  <STRONG>fgluTessEndPolygon</STRONG></PRE></BODY></HTML>

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