1991-2006
Silicon Graphics, Inc.
gluTessEndPolygon
3G

# gluTessEndPolygon

delimit a polygon description

## C Specification

                    void gluTessEndPolygon
                    GLUtesselator* tess

## Parameters

`tess`

  Specifies the tessellation object (created with gluNewTess).

## 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.

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 like this:

    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);

In the above example the pointers, v1 through v7, should point to different addresses, since the values stored at these addresses will not be read by the tesselator until `gluTessEndPolygon` is called.

## See Also

gluNewTess, gluTessBeginContour, gluTessBeginPolygon, gluTessCallback, gluTessNormal, gluTessProperty, gluTessVertex

## Copyright

Copyright 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/.