Larry Fontaine <lfo### [at] isdnet> 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.

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