On 8 Sep 1999 07:06:21 -0400, Nieminen Juha wrote:
>Peter Popov <pet### [at] usanet> wrote:
>: I stand corrected. Not with a single sor, that is. You can make a
>: torus using CSG and two sors.
>
>  How?

Difference between the "outside" part - shaped a bit like a flattened
sphere - and the "inside" part - shaped somewhat like a one-sheet 
hyperboloid.

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