[Radiance-general] Gensky question

[Ehsan Vazifeh]

Hi Jiajie,

You can refer to the source code of GENKY. There you can see the formulas used to calculate RGB from the direct irradiance. Here is the link:
https://github.com/NREL/Radiance/blob/master/src/gen/gensky.c <https://github.com/NREL/Radiance/blob/master/src/gen/gensky.c>






if (u_solar == -1)
	solarbr /= 6e-5*sundir[2];
else if (u_solar == 0) {
	solarbr = 1.5e9/SUNEFFICACY *(1.147 - .147/(sundir[2]>.16?sundir[2]:.16));
if (skytype == S_INTER)
	solarbr *= 0.15;	/* fudge factor! */

Cheers,
Ehsan


> On 10 Aug 2015, at 15:32, Jiajie Zhu <jonathan.zhu.uk at gmail.com> wrote:
> 
> 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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