[Radiance-general] Radiance and Optics

[Phillip Greenup]

Hi Rob,

These definitions are good and bad.  they allow you (or Optics5) to define 
both the specular reflectance and specular transmittance of the glasses, 
but they don't allow for any angular variation in either.  you may be 
better off just sticking with the glass primitive, using transmissivities 
calculated from the transmittances delivered by Optics5.

Phil.


>Interesting.  I didn't know about those programs.  Seems
>to be a large collection of glazing definitions.  When you
>export to radiance in Optics5, you get something like this:
>
>======================
>void  glass       GRAY_6_glass
>0
>0
>3     0.492     0.490     0.515
>
>void  BRTDfunc    GRAY_6_front
>10
>       0.049     0.049     0.051
>       0.451     0.449     0.472
>       0 0 0
>       .
>0
>9 0 0 0 0 0 0 0 0 0
>
>void  BRTDfunc    GRAY_6_back
>10
>       0.050     0.050     0.053
>       0.451     0.449     0.472
>       0 0 0
>       .
>0
>9 0 0 0 0 0 0 0 0 0
>=====================
>
>So it appears to be defining a highly accurate material
>definition using BRTF.  Could some of the gurus comment?
>  This could be a useful database for the novice Radiance
>user with a skimpy materials library (me).
>
>          ====================
>  Rob Guglielmetti <rpg777@earthlink.net>
>     http://home.earthlink.net/~rpg777