[Radiance-general] question about sky.mat

[Iebele]

Hi Imene, 

I don't know which tutorial you use. 

A very basic way to create an overcast sky at june 21 at 13.00 would be like:

iep at login4:~/projecten/PHB$ gensky 6 21 13  -c   > sky.mat 

This would add the following lines to the file sky .mat:

# gensky 6 21 13 -c
# Local solar time: 12.84
# Solar altitude and azimuth: 72.0 40.5
# Ground ambient level: 31.8

void brightfunc skyfunc
2 skybr skybright.cal
0
3 2 4.09e+01 6.36e+00


Now you can edit yourself a sky description file for the upper hemisphere. Create a file sky_overcast.mat and add these lines:


skyfunc  glow sky_mat
0
0
4
1 1 1   0

sky_mat source sky
0
0
4     0 0 1 180

This is very basic, but gives you the idea.

Hope this helps, 

- iebele 



Op 16 jul. 2012, om 19:35 heeft imenslama at voila.fr het volgende geschreven:

> Hi community,
> In radiance tutorial, for simulation of daylighting, we must create a file named sky.rad and an other file named sky_overcast.mat. But I can't find a description of the second file, I mean sky_overcast.mat. I know that is a material for an overcast sky but what should we write to define this file? Please, can you gives me an example?
> thank you
> imène
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