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Ken wrote:
>
> 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] capoleuca it
>
> 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.
All is not lost. It is possible (though tedious) to construct a
polyhedron as the intersection of planes such that one could perform CSG
operations with it.
--
Mark Gordon
mtg### [at] mailbag com
http://www.mailbag.com/users/mtgordon/index.html
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GCS/S d-- s-: a- C++$ UA+$ UH+$ UO+$ US+$ UL++++ P+++ L++(+++) E W++ N+
o--
K++ w---$ O- M$ V--$ PS++ PE- Y+ PGP->+ t+ 5++ X R+ tv-- b++ DI++$ D+ G
e++>++++ h- r*%-- y-
------END GEEK CODE BLOCK------
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