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+_C_ License Applicability. Except to the extent portions of this file are
+_C_ made subject to an alternative license as permitted in the SGI Free
+_C_ Software License B, Version 1.1 (the "License"), the contents of this
+_C_ file are subject only to the provisions of the License. You may not use
+_C_ this file except in compliance with the License. You may obtain a copy
+_C_ of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+_C_ Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+_C_ 
+_C_ http://oss.sgi.com/projects/FreeB
+_C_ 
+_C_ Note that, as provided in the License, the Software is distributed on an
+_C_ "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+_C_ DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+_C_ CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+_C_ PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+_C_ 
+_C_ Original Code. The Original Code is: OpenGL Sample Implementation,
+_C_ Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+_C_ Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+_C_ Copyright in any portions created by third parties is as indicated
+_C_ elsewhere herein. All Rights Reserved.
+_C_ 
+_C_ Additional Notice Provisions: The application programming interfaces
+_C_ established by SGI in conjunction with the Original Code are The
+_C_ OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+_C_ April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+_C_ 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+_C_ Window System(R) (Version 1.3), released October 19, 1998. This software
+_C_ was created using the OpenGL(R) version 1.2.1 Sample Implementation
+_C_ published by SGI, but has not been independently verified as being
+_C_ compliant with the OpenGL(R) version 1.2.1 Specification.
+_C_
+_C_ $Date: 2004/03/14 08:29:09 $ $Revision: 1.1.1.4 $
+_C_ The first character in this file must be an '_'!
+_C_ Anything on a line after _C_ is ignored
+_define(_filters,eqn)_C_
+_C_      eqn is automatically replaced with neqn for nroff
+_header(TessBeginPolygon, delimit a polygon description)
+_names(TessBeginPolygon)
+.EQ
+delim $$
+.EN
+.SH PARAMETERS
+_phead(_param1)
+Specifies the tessellation object (created with _cmnd(NewTess)).
+_phead(_param2)
+Specifies a pointer to user polygon data.
+.SH DESCRIPTION
+_cmnd(TessBeginPolygon) and _cmnd(TessEndPolygon) delimit the definition of a
+convex, concave or self-intersecting polygon. Within each _cmnd(TessBeginPolygon)/_cmnd(TessEndPolygon)
+pair, there must be one or more calls to _cmnd(TessBeginContour)/_cmnd(TessEndContour). 
+Within each contour, there are zero or more calls to _cmnd(TessVertex). The vertices 
+specify a closed contour (the last vertex of each contour is automatically linked 
+to the first). See the _cmnd(TessVertex), _cmnd(TessBeginContour), and 
+_cmnd(TessEndContour) reference pages for more details.
+.P
+_param2 is a pointer to a user-defined data structure. If the appropriate callback(s) 
+are specified (see _cmnd(TessCallback)), then this pointer is returned to the 
+callback function(s). Thus, it is a convenient way to store per-polygon information.
+.P
+Once _cmnd(TessEndPolygon) is called, the polygon is tessellated, and the
+resulting triangles are described through callbacks.
+See _cmnd(TessCallback) 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
+_cmnd(NewTess), _cmnd(TessBeginContour), _cmnd(TessVertex), 
+_cmnd(TessCallback),
+_cmnd(TessProperty), _cmnd(TessNormal),
+_cmnd(TessEndPolygon)