"Trevor G Quayle" <Tin### [at] hotmailcom> wrote:
> "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

A thin very tranparent layer of fog colored chaulky grey bounded by an
invisible shape should do the trick.

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