[Radiance-general] Perforated window shading

[Lars O. Grobe]

Hi Thomas, Marcus!

> Your LUX values will be very low. With a trans material you are
> basically reducing the incoming light to about 1/8th of the available
> light. Your simple trans material will also not account for indirect
> light reflected off the blinds. This can be a substantial part of the
> transmitted light. 

I was assuming that the blinds are still modelled geometrically (e.g.
using genblinds or an imported mesh). The trans modifier was just
proposed to be applied to the blinds geometry. As the (metal?) blinds
are transmissive only due to the holes, transmission would be purely
specular, reflection probably both diffuse and specular.

Cheers, Lars.