"Chris B" <nom### [at] nomailcom> wrote in message 
news:4a70803b@news.povray.org...
>
> I think there is at least one more way without using shear, which is to 
> scale a cone non uniformly, rotate and slice it, such that the horizontal 
> section becomes circular while the edge is vertical, then fill out the 
> middle as before.
>

In fact I've tried it and I don't think my fourth way works because you 
always end up with a parabolic conic section.
Nevertheless, Le Forgeron looks as though he's still churning out more 
alternatives :-)
Geometry questions seem popular. Any more ;)

Regards,
Chris B.

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