"Mike Williams" <mik### [at] econymdemoncouk> wrote in message
news:5ZWS4TAzBvF$Ew6X@econym.demon.co.uk...
> Wasn't it David Wallace who wrote:
> >When I try to subtract a torus whose inner radius exceeds its outer
radius
> >from a cylinder, it leaves an ovoid behind.
>
> Yes. What else would you expect it to do?
>
> A fat torus is a self-intersecting shape. Under normal circumstances
> there's a hole inside. When you difference the torus out of some other
> object, then the bit that was the hole gets left behind.
>
That's what I suspected.  Hence the commented cutouts in the original post.
The idea was to wipe out the nipple and, once discovered, the central ovoid.
The cylinder got the nipple but left part of the ovoid while the sphere got
the ovoid but left a small part of the nipple.  Actually the object looks
quite nice with just the sphere removed.

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