Signature
Parameters
| Variables | Description |
|---|---|
| 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,
through
,
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
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/
.
Sample Code References
The following code samples have been found which appear to reference the functions described here. Take care that the code may be old, broken or not even use PyOpenGL.
gluTessEndPolygon
