[Radiance-general] Properly defining a roller shade fabric asa TRANS material type

[Lars O. Grobe]

Christopher Rush wrote:
> Good point about the thickness. If the shade is 3% open I suppose the
> expectation would be slightly less than this in pure specular
> transmission due to the thickness of the fabric.

Hi,

fabrics will have a certain incident cut-off angle, where specular
transmission gets completely eliminated due to geometric constraint. You
can observe it with your eyes.

Cheers, Lars.
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