You can probably get the effect that you want by creating a circular array of
spheres and filling each sphere with a spherical density media. With enough
spheres, the result should look like a donut-shaped media.
Using multiple media containers is rather slow, of course, but you can get
virtually any shape of media you want.

Margus

gemelli david wrote:
> 
> Hi,
> I am currently doing a scene where an atomic bomb is exploding on a
> futuristic battlefield.
> I have made a dust wave using a torus and media but the result isn't
> very good.
> What media feature can I use to make realistic dust (it must be a
> colored dust).
> Is it possible to make a gradient from the center of the torus donut (is
> that the expression ?)
> to its surface ?
>     Thanks.
>                                                 David.

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