Thank you to Peter Popov and Ron Parker for the information that you gave me
on CSG, that were of great utility.

I have another question, does somebody know how is expressed a torus
mathematically?, the other figures don't represent a real problem, but does
it seem that the torus is a compound figure, how can I calculate the normal,
the intersections, etc. for a torus?, does exist a torus mathematical
formula?...

Again, thank you for your time.

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