Wasn't it Roman Reiner who wrote:
>"tgl" <aub### [at] sympaticoca> wrote:
>> Hello All
>> Is it possible to create an elliptical torus with a varying major diameter
>> and a constant minor diameter?
>>   Thanx,
>>   tgl
>
>it should be possible with isosurfaces. see e.g.
>http://www.econym.demon.co.uk/isotut/variable.htm
>Another possibility would be to approximate the surface with a spheresweep,
>see 2.4.1.10 Sphere Sweep
>http://www.povray.org/documentation/view/3.6.1/284/

I've tried to achieve the effect by modifying the "surface of
revolution" isosurface technique, but everything that changes the major
diameter seems to have a side effect that changes the shape of the minor
cross section.

-- 
Mike Williams
Gentleman of Leisure

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