[Radiance-general] Gendaylit Visible radiation

[Lars O. Grobe]

Hi Julien,

you did not forget to apply the skyfunc generated by gendaylit to a glow modifier and use that with a source object? How do you calculate the irradiance in Radiance? -ab is greater than 0?

Cheers, Lars.

> Hi everyone, 
> 
> I 'm using gendaylit function to generate sky with visible spectrum only. I introduce horizontal direct irradiance and horizontal diffuse irradiance (-G parameter) which are computed from horizontal global irradiance (meteo data : full spectrum).
> 
> I don't understand why sky irrandiance in Radiance is approximatively 60% of horizontal global irradiance. In my mind, the visible spectrum is approximatively 40-45% of full spectrum, is it wrong?
> 
> Example gendaylit command : 
>    
>    gendaylit 6 21 12:00GMT -a 46.51 -o -6.56 -m -15 -G 500 200
> 
> Thanks for your answer.
> 
> Cheers
> Julien
> 
> 
> 
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