redhat man page for glubeginpolygon

GLUBEGINPOLYGON(3G)													       GLUBEGINPOLYGON(3G)

NAME
       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 callbacks.  See gluTessCallback
       for descriptions of the callback functions.

NOTES
       This command is obsolete and is provided for backward compatibility only. Calls to gluBeginPolygon are mapped to  gluTessBeginPolygon  fol-
       lowed 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(3G), gluNextContour(3G), gluTessCallback(3G), gluTessVertex(3G), gluTessBeginPolygon(3G), gluTessBeginContour(3G)

															       GLUBEGINPOLYGON(3G)