GLvoid* data )

PARAMETERS
       tess  Specifies the tessellation object (created with gluNewTess).

       data  Specifies a pointer to user polygon data.

DESCRIPTION
       gluTessBeginPolygon  and  gluTessEndPolygon  delimit the definition of a
       convex,   concave   or   self-intersecting    polygon.    Within    each
       gluTessBeginPolygon/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
       gluTessCallback for descriptions of the callback functions.

EXAMPLE
       A  quadrilateral  with  a triangular hole in it can be described as fol‐
       lows:

       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);

SEE ALSO
       gluNewTess,   gluTessBeginContour,    gluTessVertex,    gluTessCallback,
       gluTessProperty, gluTessNormal, gluTessEndPolygon

                                                        GLUTESSBEGINPOLYGON(3G)