I have seen many of the pictures using media to simulate particulate 
matter in the air, like a sunbeam entering a dusty room, but I have not 
been able to reproduce that effect.

What happens is either I don't see any effect, or the entire scene 
becomes one giant gray mass.

I have read through the help files extensively, but still haven't been 
able to solve the problem.  Any help you could give would be appreaciated.

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