Delimits a polygon 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
The following describes a quadrilateral with a triangular hole:
Glu.gluTessBeginPolygon(tobj, null); Glu.gluTessBeginContour(tobj); Glu.gluTessVertex(tobj, v1, v1); Glu.gluTessVertex(tobj, v2, v2); Glu.gluTessVertex(tobj, v3, v3); Glu.gluTessVertex(tobj, v4, v4); Glu.gluTessEndContour(tobj); Glu.gluTessBeginContour(tobj); Glu.gluTessVertex(tobj, v5, v5); Glu.gluTessVertex(tobj, v6, v6); Glu.gluTessVertex(tobj, v7, v7); Glu.gluTessEndContour(tobj); Glu.gluTessEndPolygon(tobj);
Glu Class | Tao.OpenGl Namespace | Glu.gluTessBeginPolygon Overload List | gluNewTess | gluTessBeginContour | gluTessCallback | gluTessEndPolygon | gluTessNormal | gluTessProperty | gluTessVertex