Tor Olav Kristensen wrote:

> ...
> By the strange behaviour of the torus shape when the minor radius is
> greater than the major radius.
>
> The latter can be seen when such a torus is subtracted from another
> shape in a CSG operation. (This behaviour can be exploited if one
> wish to make "concave cylinders" or "cigars".)

Sorry. Correction: "convex cylinders"

To get a "cigar", try this:

#declare CigarRadius = 0.5;
#declare MinorRadius = 26;
#declare MajorRadius = MinorRadius - CigarRadius;

difference {
  sphere { <0,0,0>, sqrt(pow(MinorRadius, 2)-pow(MajorRadius, 2))}
  torus { MajorRadius, MinorRadius }
}

The cigar you get from this appears to be hollow (?).
So if you try to do further CSG operations with it you may not get
the desired result.

Tor Olav

mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html

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