centos man page for glutessbeginpolygon

GLUTESSBEGINPOLYGON(3G) 					   OpenGL Manual					   GLUTESSBEGINPOLYGON(3G)

NAME
       gluTessBeginPolygon - delimit a polygon description

C SPECIFICATION
       void gluTessBeginPolygon(GLUtesselator* tess, 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 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);

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

COPYRIGHT
       Copyright (C) 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see
       http://oss.sgi.com/projects/FreeB/.

AUTHORS
       opengl.org

opengl.org							    06/10/2014						   GLUTESSBEGINPOLYGON(3G)