yan### [at] pacbellnet wrote:
: The subject says it all.

                             Section 7.5.5.1
                                About CSG

Constructive Solid Geometry is a technique for combining two or more objects
to create a new object using the three boolean set operators union,
intersection, and negation. It only works with solid objects, i. e. objects
that have a well-defined interior. This is the case for all objects described
in the sections "Finite Solid Primitives" and "Infinite Solid Primitives".

CSG shapes may be used anywhere a standard shape can be used, even inside
other CSG shapes. They can be translated, rotated or scaled in the same way
as any other shape. The shapes making up the CSG shape may be individually
translated, rotated and scaled as well.


  See also all chapter 7.5.5 of the povray documentation.

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                                                              - Warp. -

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