[Radiance-general] Randance and different sky descriptions

[Allison Bygott]

Hello.

I have been evaluating a couple of different software programs that interface with Radiance. Unfortunately, my "standard" test models aren't producing the same results in each software; the results are different by at least a factor of 2. I'm trying to understand how each software is separately using Radiance to come up with daylight results. I believe this requires an understanding of how the sky files are generated. I spent some time today poking around the Radiance-online mailing lists, looking for sky file content clues, but I suspect that some of these concepts are above me. I did review the gensky document dated 4/24/98 and I found it informative. I'm hoping that the community might provide some insight on the content of two "comparable" sky files; please see below:

Software 1:

!gensky 3 21 12.01 +s -a 40.03 -o 105.28 -m 105.00

skyfunc glow skyglow
0
0
4  0.7  0.8  1.0 0

skyglow source sky
0
0
4 0 0 1 180

skyfunc glow grndglow
0
0
4 0.05 0.1 0.07 0

grndglow source ground
0
0
4 0 0 -1 180



Software 2:

void light solar
0
0
3 11009526.873677 11009526.873677 11009526.873677

solar source sun
0
0
4 0.039983 -0.647611 0.760921 0.5

void brightfunc skyfunc
2 skybr IES_skybright.cal
0
7 1 15.092265 18.041592 0.649859 0.039983 -0.647611 0.760921

skyfunc glow skyglow
0
0
4 0.989 0.989 1.159 0

skyglow source sky
0
0
4 0.0 0.0 1.0 180

skyfunc glow groundglow
0
0
4 1.0 1.0 1.0 0

groundglow source ground
0
0
4 0.0 0.0 -1.0 180


Thank you. I appreciate any thoughts on the matter.


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ALLISON BYGOTT, PE, LC, LEED-AP

ENGINEER

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