I wonder why I get an asymmetric Daylight factor, can anyone explain and tell me what I need to change?

-ab 48 -ad1250 -as 40 -ar 500 -aa 0.09

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Hi Thomas,

At first glance I don't see much asymmetry, but I can't get a sense of the geometry from your screen shot. Could you post a screen shot of a perspective view, and maybe just run a pair or two of the nodes that are giving you questionable results? Also- try running it with the default radiance settings.

Jeff

The Daylight factor values from DIVA daylight component, should be symmetrical over the y-axis (CIE overcast sky) ..I have tried the default radiance settings, it gets worse..

(e.g. the numbers in the connors should be the same DF 0.9 / 1.6)


jeff niemasz said:

Hi Thomas,

At first glance I don't see much asymmetry, but I can't get a sense of the geometry from your screen shot. Could you post a screen shot of a perspective view, and maybe just run a pair or two of the nodes that are giving you questionable results? Also- try running it with the default radiance settings.

Jeff

Thomas, if you post a simplified version of the definition showing the disparity I would be happy to troubleshoot. I looked at the definition you posted briefly. A lot of it is in a password protected cluster, but I can see that your ground plane is way larger than it needs to be, and this will undermine the resolution of your simulation. Because of the method of the raytrace simulation, I don't think you will ever get results to be exactly symmetrical (or the same from simulation to simulation) but they should be close if the settings are correct for the model. I suspect you are exacerbating the difference in results with the unusually large ground plane (which changes the models maximum dimension and thereby the resolution settings), and the radiance settings you have chosen. Here are two discussions to check out, their is also a lot of material online regarding radiance settings.

discussion

discussion

Jeff

Hey Jeff, I forgot to say that the problem was the large plane. As always thanks :-) 

jeff niemasz said:

Thomas, if you post a simplified version of the definition showing the disparity I would be happy to troubleshoot. I looked at the definition you posted briefly. A lot of it is in a password protected cluster, but I can see that your ground plane is way larger than it needs to be, and this will undermine the resolution of your simulation. Because of the method of the raytrace simulation, I don't think you will ever get results to be exactly symmetrical (or the same from simulation to simulation) but they should be close if the settings are correct for the model. I suspect you are exacerbating the difference in results with the unusually large ground plane (which changes the models maximum dimension and thereby the resolution settings), and the radiance settings you have chosen. Here are two discussions to check out, their is also a lot of material online regarding radiance settings.

discussion

discussion

Jeff

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