"Darren New" <dne### [at] sanrrcom> wrote in message 
news:4a7078d0$1@news.povray.org...
> clipka wrote:
>> Darren New <dne### [at] sanrrcom> wrote:
>>> Could one start with a cylinder instead? Since the top is as wide as the
>>> bottom in at least one direction?
>>
>> Hm, yes, I guess a cylinder intersected with a wedge would fit Thomas' 
>> bill, too
>> (at least nominally, though it may not be what he looked for, due to the 
>> hard
>> edges this would produce)
>
> I was thinking more scale it from x=1.0 y=1.0 to x=1.0 y=0.0 as you move 
> from z=0 to z=1, if that makes sense. Not an intersection, but a 
> non-linear scaling.
>

That's what two of the three examples I posted this morning do, one using an 
Isosurface, the other using slices of a sphere, (but a cylinder would work 
the same). The third example I posted used the method Clipka outlined, which 
generates a slightly different shaped surface.

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.

Regards,
Chris B.

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