[Radiance-general] Radiance and Optics

[Rob Guglielmetti]

On 4 Jun 2002, at 12:09, Westling, Robert wrote:

> We are working on simulations involving complex glazing
> assemblies and day lighting.  We use LBL Window4.1, and LBL
> Optics5 to construct and simulate these assemblies. We now
> want to use the assemblies we have created in Radiance.  We
> see that Optics5 exports "Radiance" files.  Has anyone used
> this method to simulate glazing systems?  Any info would be
> appreciated.

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