the dust I would be moddelling would be on the upper surfaces of objects -
airborne dust can be pretty well simulated with media. The one thought I
had would be this: Is there any way to create a loop that distinguishes all
surfaces facing in a single direction or at least partly in a direction ie
set to pick up y facing surfaces would also pick up the line x*y. Dont know
whether that makes sense. It would then add a semi transparent layer on top
of the current texture. Im not sure how I would go about writing this or
even if it is possible in povray.
Peter

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