I thought maybe someone would have responded to your asking for help by now.
I can say, try a 'spherical' density instead of a gradient one but I don't 
know what the end product is supposed to look like. All I could tell is the 
torus grows wider along the ground plane.
I expected it to be more like a fireball in the air.
Anyway, spherical is one possibility, perhaps scaled smaller in the y than in 
the x an z (scale <1,0.5,1>). And speaking of scale, when media is scaled up 
it intensifies the effect of the media used, scaled down it de-intensifies. 
So, try and setup the media into the object first and then adjust the density 
color values up or down.
Another way is to use 'scattering' as well and adjust it (it can use a color 
vector too).
There's my hints.

Message <36679D03.F2CACD3A@imerir.asso.fr>, gemelli david  typed...
>
>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.
>This is the what I am currently using:
>
>#local Dust_Media_1 =
>media {
>     absorption 0.3
>     intervals 20
>     density {
>          gradient y
>          turbulence 0.2
>          color_map {
>               [0 color rgb<0.7,0.7,0.9>]
>               [0.6 color rgb<0.5,0.6,0.8>]
>               [0.98 color rgb<0,0,0>]
>               [1 color rgb<0,0,0>]
>          }
>     }
>}
>
>#local Dust_Media_2 =
>media {
>     emission 0.08
>     intervals 20
>     density {
>          gradient y
>          turbulence 0.2
>          color_map {
>               [0 color rgb<0.456863,0.319608,0.037255>]
>               [0.9 color rgb<0.556863,0.419608,0.137255>]
>               [0.95 color rgb<0,0,0>]
>               [1 color rgb<0,0,0>]
>          }
>     }
>}
>
>torus {
>     (40 * CLOCK_DUST) + 1
>     1.8
>     pigment {rgbt <1,1,1,1>}
>     interior {
>          media {
>               Dust_Media_1
>               scale <2,2,2>
>          }
>          media {
>               Dust_Media_2
>               scale <2,2,2>
>          }
>     }
>     scale <2, 2, 2>
>     translate <0,(20*(1/256)*100)-(4*ALTITUDE_DUST),0>
>     hollow
>}
>

-- 
 omniVERSE: beyond the universe
  http://members.aol.com/inversez/POVring.html
=Bob

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