gluBeginPolygon,   gluEndPolygon   -   delimit  a  polygon
       description



C SPECIFICATION

       void gluBeginPolygon( GLUtesselator* tess )

       void gluEndPolygon( GLUtesselator* tess )



PARAMETERS

       tess  Specifies  the  tessellation  object  (created  with
             gluNewTess).


DESCRIPTION

       gluBeginPolygon  and  gluEndPolygon delimit the definition
       of a nonconvex polygon.  To define such a  polygon,  first
       call  gluBeginPolygon.   Then  define  the contours of the
       polygon by  calling  gluTessVertex  for  each  vertex  and
       gluNextContour  to  start each new contour.  Finally, call
       gluEndPolygon to signal the end of  the  definition.   See
       the  gluTessVertex  and gluNextContour reference pages for
       more details.

       Once gluEndPolygon is called, the polygon is  tessellated,
       and  the  resulting  triangles are described through call-
       backs.  See gluTessCallback for descriptions of the  call-
       back functions.


NOTES

       This command is obsolete and is provided for backward com-
       patibility only. Calls to gluBeginPolygon  are  mapped  to
       gluTessBeginPolygon followed by gluTessBeginContour. Calls
       to gluEndPolygon are mapped to gluTessEndContour  followed
       by gluTessEndPolygon.


EXAMPLE

       A  quadrilateral  with  a  triangular  hole  in  it can be
       described like this:

       gluBeginPolygon(tobj);
          gluTessVertex(tobj, v1, v1);
          gluTessVertex(tobj, v2, v2);
          gluTessVertex(tobj, v3, v3);
          gluTessVertex(tobj,   v4,   v4);   gluNextContour(tobj,
       GLU_INTERIOR);
          gluTessVertex(tobj, v5, v5);
          gluTessVertex(tobj, v6, v6);
          gluTessVertex(tobj, v7, v7); gluEndPolygon(tobj);


SEE ALSO

       gluNewTess,        gluNextContour,        gluTessCallback,