gluTessEndPolygon — delimit a polygon description
Specifies the tessellation object (created with gluNewTess).
gluTessEndPolygon delimit the
definition of a convex, concave, or self-intersecting polygon. Within
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
gluTessEndPolygon is called, the polygon is tessellated, and the
resulting triangles are described through callbacks.
See gluTessCallback for descriptions of the callback functions.
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,
should point to different
since the values stored at these addresses will not be read by
the tesselator until
gluTessEndPolygon is called.
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