[Radiance-general] BSDF material interaction with -ab

[Marouane.Boudhaim at ise.fraunhofer.de]

Hello Radiance community,

I was wondering in my reasearch how did -ab  parameter interact with bsdf 
based material. Specifically, how would an -ab 0 behave. Would it let me 
keep the direct portion of the calculation? If so what would be the direct 
portion, the transmitted ray that has the same direction as the incident 
one ? I'd guess such assumption wouldn't hold up very well in some cases.

Sincerely,
Marouane.
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