Hmm, these settings _should_ give a rather smooth media. I think min_samples
could be dropped quite a bit, actually. You could try lowering variance to
1/256. Sometimes (I'm not sure, under what conditions) media looks very
grainy when the light_source is nearly anti-parallel to the camera. Have you
tried some mega-high sampling rate and does that solve the problem?
Like Ken suggests, the extinction should be lowered for fog (or any media
whose particles have a high albedo); 0.1 seems a bit extreme, though.
Dunno...
BTW, your scene must be truly huge, if such low-intensity media shows up at
all.

Margus

Steven Pigeon wrote in message <370F6DEA.F25FE695@iro.umontreal.ca>...
>
>
>I use this declaration:
>
>#declare intensite_r = 0.0000000;
>#declare intensite_g = 0.0000000;
>#declare intensite_b = 0.0000015;
>
>
>media
> {
>  intervals 5
>  scattering { 1, rgb < intensite_r, intensite_g, intensite_b > }
>  //samples 50, 100
>  samples 35, 50
>  confidence 0.99999
>  variance 1/100
>  ratio 0.9
> }
>
>But the media remains coarse and grainy. Is there a way to
>get smooth-looking fog like mist without pumping the sampling
>rate to, say, 500 or something ?
>
>
>Best,
>
>    S.
>
>----------------------------------------------------------
>Steven Pigeon                     Ph. D. Student.
>University of Montreal.
>pig### [at] iroumontrealca           Topics: data compression,
>pig### [at] jspumontrealca          signal processing,
>ste### [at] researchattcom           non stationnary signals
>                                  and wavelets.
>----------------------------------------------------------
>         http://www.iro.umontreal.ca/~pigeon
>
>

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