[Radiance-general] Surfaces Roughness and simulation parameters

[Giovanni Betti]

Dear List, 

I was trying to simulate the visual appearance of brushed alluminum, but
I am struggling with the roughness of the materials.

I am using metal and metal2 at different roughness settings, but I
always seem to get a pattern in the roughness of the material, I was
wondering if any other rpict parameters affect the material behaviour.

My current suspects are:

-ad   Set the number of ambient divisions to N
-as   Set  the number of ambient super-samples to N
-ms	Set the medium sampling distance to sampdist

does anybody has some insight in this?
Thanks,

Giovanni


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Giovanni Betti