From what I have seen in the new Bryce 5 if a DOF (depth of field is used with a small factor on the "Rays Per Pixel" it can produce a grainy type of effect, although I think it looks more "splotchy" than grainy and it doesn't look very good in my opinion. But, I think what you are really refering to is done in Photoshop, PSP, etc. It can reproduce a film grain, like in black & white photo's.

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