[Radiance-general] Reduce rtrace runtime

[Jia Hu]

Hello experts:

I hope to calculate illuminance at 4 points in a office under four 100 sky
conditions (each condition will generate four illuminance values). I run
rtrace in a  computer with 4 processors and use: rtrace -w -h -I -ab 7 -n 4
-af cachingFile.ca -ad 2048 -as 512 -aa 0.10 office.oct < points.inp | rcalc
-e '$1=47.4*$1+ 120*$2+11.6*$3'>> output.out.

I tried to run it but it took long time. My question is that whether there
are ways of improving the rtrace command to reduce the runtime?

Cheers,
Jia
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