[Radiance-general] Forward ray tracing and daylight systems

[Martin Moeck]

Hi,
 
I wrote a paper on forward ray tracing and general daylight systems simulation - louvers, prisms, that sort of thing. The paper proof is at 
 
www.personal.psu.edu/mum13/rays.pdf
 
It should appear in about 2 weeks in LEUKOS at www.iesna.org. 
 
Anyway, I was quite surprised how many rays it takes to get stable results. We traced up to 7 million rays through a specular microlouver sold by www.Siteco.de. We took the exiting ray distribution towards the room and converted it into an IES photometric format file in 1-degree vertical and 22.5 degree horizontal steps for use in Radiance or other lighting calculation programs. 
 
Martin
 
 
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