How to have a radiance material with two different side?


Hi all,
I don’t really know how can I have a radiance material which has two different sides? for example how to define a fabric which in one side is more reflective and has a different color from the other side? like the available fabric with this quality?

Thank you in advance for your response.

Material of radiance

BRTDfunc might work for diffusing surfaces. The image below shows a box with single surfaces that has different colors on forward and backward directions.

void BRTDfunc someMaterial
10 0 0 0 0 0 0 0 0 0 .
0.5 0.2 0.2
0.2 0.2 0.5
0 0 0

You will get a more definitive answer to this question on the Radiance forum: