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On Fri, 17 Sep 1999 10:51:21 -0400, Buckaroo Bill wrote:
>Larry Fontaine <lfo### [at] isd net> wrote in message
>news:37E00892.1BEC2B42@isd.net...
>> Suggestion for the next version of POV:
>> A torus pattern, like the sphere one, but a torus...
>> Would be major radius 1, along the X-Y or X-Z plane, with the value
>> gradually dropping off from 1 at minor-radius 0 to 0 at minor-radius 1.
>>
>
> Having played around some more, I wonder if there is a way to make a
>torus pattern rotate along it's minor axis, so as to make a true smoke ring
>animate?
>
> I suspect that at this point it will take isosurface if it can be done
>at all. It would have to be a radial pattern rotated around the major axis
>somehow.
Well, radial is just atan2(x,z) scaled and rotated appropriately. There isn't
yet an atan2 in the superpatch, but there will be. At that point, you'll be
able to compute a function like what you're looking for, but it won't be
pretty.
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