Vladimir, I think you need to use the "slope y" pattern on a texture 
map, with a very grainy texture for the horizontal parts and transparent 
for the rest, like I did for my beach scene:

http://www.ignorancia.org/images/personal/coinchas-8b.jpg

I never tried to use this trick for a layer of dust, but I think it can 
be very difficult to adjust (dust particles are much smaller than sand 
grains).

--
Jaime

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