"Bryan Valencia" <com### [at] yahoocom> wrote:
> I tried a semitransparent granite texture to simulate surface dust (not in
> the atmosphere, just lying on the surfaces, and I am not satisfied.
>
>
> Is there another approach to adding surface dust to a texture?

have a look at "slope" pattern textures

eg (one that I've used before):

#declare TDusty=
texture{
  pigment{
    slope y
    color_map{
      [0.5 rgbt 1]
      [1.0 rgbt<0.65,0.65,0.60,0.75>]
    }
    poly_wave 1.1
  }
  finish{
    ambient 0
    diffuse 0.85
    brilliance .33
  }
}

Layer it over your base layer, you can even try a normal to enhance it.

-tgq

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