Hi.
I posted a message about this a while back. My scene is pretty complicated
so placing partiucles would have been impossibble  and media would have
taken to long. My solution was to add a block to all of my relevant
textures with a slope map to vary the depth of the dust with gradient. the
dusat itself was simulated with a small scale bozo pattern with
transparency of about .7
The results are alright and the bonus is it doent add much to rendre times.
Peter

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