[Radiance-general] Simulating Prismatic Diffuser

[John Mardaljevic]

I'll second Lars' warning: Radiance is not the best tool to model the  
light output distribution of a luminaire.  Of course, modelling pre- 
determined light output distributions for luminaires is another  
matter and Radiance has no problem with that.

See "Development and validation of a Radiance model for a translucent  
panel" by Reinhart and Andersen for a very thorough description of  
how to go about modelling translucent panels -- not the same as a  
'prismatic diffuser' but should prove informative.
Direct link to paper here:
http://irc.nrc-cnrc.gc.ca/pubs/fulltext/nrcc48165/nrcc48165.pdf

-John

-----------------------------------------------
Dr. John Mardaljevic
Senior Research Fellow
Institute of Energy and Sustainable Development
De Montfort University
The Gateway
Leicester
LE1 9BH, UK
+44 (0) 116 257 7972
+44 (0) 116 257 7981 (fax)

jm at dmu.ac.uk
http://www.iesd.dmu.ac.uk/~jm