tommaso wrote:
> 
> Please help me,
> 
> Declared:
>         A = Solid  (Cone, box, cylinder)
>         B = Polyhedron (Prism or generic surface realized with union of
> polygons)
> 
> I want to make
> 
> difference:
>                 1)      A - A    (OK)
>                 2)      A - B   no results
>                 3)      B - A   no surface of difference
>                 4)      B - B   no results
> 
>                 What is the solution for the cases 2,3,4 ?
> 
> Excuse my english,
> 
>                 Thanks
> 
>                 Tst### [at] capoleucait

  Polygons, bicubic patches, meshes, triangles and a two other types
of pov objects are considered infinitely thin objects. They have no
well defined inside and outside. Because of this they are not allowed
to be used in a CSG operation except for the union CSG operation.

-- 
Ken Tyler

mailto://tylereng@pacbell.net

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