fgluTessEndPolygon(3G) OpenGL Reference fgluTessEndPolygon(3G)NAME
fgluTessEndPolygon - delimit a polygon description
FORTRAN SPECIFICATION
SUBROUTINE fgluTessEndPolygon( CHARACTER*8 tess )
PARAMETERS
tess Specifies the tessellation object (created with fgluNewTess).
DESCRIPTION
fgluTessBeginPolygon and fgluTessEndPolygon delimit the definition of a
convex, concave or self-intersecting polygon. Within each
fgluTessBeginPolygon/fgluTessEndPolygon pair, there must be one or more
calls to fgluTessBeginContour/fgluTessEndContour. Within each contour,
there are zero or more calls to fgluTessVertex. The vertices specify a
closed contour (the last vertex of each contour is automatically linked
to the first). See the fgluTessVertex, fgluTessBeginContour and
fgluTessEndContour reference pages for more details.
Once fgluTessEndPolygon is called, the polygon is tessellated, and the
resulting triangles are described through callbacks. See
fgluTessCallback 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);
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fgluTessEndPolygon(3G) OpenGL Reference fgluTessEndPolygon(3G)
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 fgluTessEndPolygon is called.
SEE ALSO
fgluNewTess, fgluTessBeginContour, fgluTessVertex, fgluTessCallback,
fgluTessProperty, fgluTessNormal, fgluTessBeginPolygon
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