[Radiance-general] Gendaylit Visible radiation

[Julien Boutillier]

Hi Lars, 

I don't forget to apply the skyfunc to a glow modifier. Here  is 2 files which describe my sky. Did I make something wrong? 

-----------------------------
sky.rad
-----------------------------
# gendaylit 6 21 12:00GMT -a 46.517402 -o -6.562417 -m -15 -G 500 200
# Ground ambient level: 39.2

void light solar
0
0
3 4.510e+06 4.510e+06 4.510e+06

solar source sun
0
0
4 0.140166 -0.384035 0.912617 0.533000

void brightfunc skyfunc
2 skybright perezlum.cal
0
10 4.182e+01 2.566e+01 -0.905314 -0.339010 12.922843 -3.513900 0.118111 0.140166 -0.384035 0.912617 

------------------------------
skyglow.rad
------------------------------
skyfunc glow sky_glow
0
0
4 1 1 1 0

sky_glow source sky
0
0
4 0 0 1 180

skyfunc glow ground_glow
0
0
4 1 1 1 0

ground_glow source ground
0
0
4 0 0 -1 180

--------------------------------

I use rtrace to calculate the irradiance in a point high in the sky (100meter). -ab parameter is equal to 0, I don't need interreflexion for this case, is it wrong?

Thanks for your help.

Cheers, 

Julien

Le 31 janv. 2013 à 15:01, Lars O. Grobe a écrit :

> 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
>> 
>> 
>> 
>> _______________________________________________
>> Radiance-general mailing list
>> Radiance-general at radiance-online.org
>> http://www.radiance-online.org/mailman/listinfo/radiance-general
> 
> _______________________________________________
> Radiance-general mailing list
> Radiance-general at radiance-online.org
> http://www.radiance-online.org/mailman/listinfo/radiance-general