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2.4.2 Finite Patch Primitives
There are six totally thin, finite objects which have no well-defined inside. They are bicubic patch, disc, smooth
triangle, triangle, polygon and mesh / mesh2. They may be combined in CSG union but cannot be used in other types of
CSG (or inside a clipped_by statement). Because these types are finite POV-Ray can use automatic bounding
on them to speed up rendering time. As with all shapes they can be translated, rotated and scaled.
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