I don't know if this would apply to the original question, but what you
describe sounds like an artifact of the monte-carlo sampling used for
media, which basically means random samples.  Not enough samples and you
get that grainy look.

This is the most noticable difference between halos and atmosphere and
media, since the previous 'volume' method seemed to take samples at
regular samples along the viewing ray which gave a smooth yet banded
look at lower sampling amounts.

-Mike

Mark Radosevich wrote:
> 
> Related(?) note:
> 
> I don't think I kept the source code, but I had a scene where there was a
> media object (I forget what kind it was) with a spotlight going though it, and
> oddly, the part that was lit by the spotlight seemed grainy--kinda like the
> way coincident surfaces do. I didn't dig deeper into it, and I'm afraid I
> don't recall any further details, but I'll experiment and see if I get it again.
> 
> -Mark R.

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