[Radiance-general] Gensky question

[Lars O. Grobe]

Hi Jiajie,

gensky calculates the radiance based on the "old" CIE standard skies. It 
sets all channels RGB to identical values (7.07e006 in your case). In 
many cases, simulations aim at results over all three channels, which is 
why most models do not focus on the prediction of color / spectrum. If 
you really need that, there are sky models aiming at color information, 
e.g. the Utah model.  Mark Stock shared his cal-file to support that 
model in Radiance:

http://markjstock.org/radiance/

However be aware that we usually rely on information that was measured 
with sensors not resolving over color channels, so there are a lot of 
assumptions to generate such colorful sky descriptions.

Cheers, Lars.
>
> Hi everyone,
>
> I just have a very quick question.
>
> I am using gensky function to generate a sky distribution with sun, 
> here is part of the scripts.
>
> /void light solar/
>
> /0/
>
> /0/
>
> /3 7.07e+006 7.07e+006 7.07e+006/
>
> I just wonder how does Radiance calculate the RGB radiance values of 
> the sun.
>
> Many thanks,
>
> Jiajie
>
>
>
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