There are four file in it. must add CIE.inc additional.
If only use, open the 'sky_render enviroment.pov' then render. The povray.ini
can modify the image size. After rendering it will produce 36 open_exr images
and two .txt file. Use Ive's spectral composer to merge these images.

The .txt file has the information about the condition you set in the pov file
and the information of the sun. Just enjoy.

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Attachments:
Download 'sky spectral_render.zip' (8 KB)

I release it under the GPL.
Here's the image:
http://news.povray.org/povray.binaries.images/thread/%3Cweb.5707b68461e083edaf5560460%40news.povray.org%3E/

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It's long time ago. But after looking more paper, I notice this file of
simulation, Rayleigh scattering is too low.
The value in 'sky_render enviroment.pov' may be modified.


The lines:

#declare f_rayleigh_extinction_coefficient = // 1/kilometer
function(_altitude, _wavelgth){
0.0007*pow(730/_wavelgth,4.05)
*exp(-_altitude/20)
}


may be modified to another value:

#declare f_rayleigh_extinction_coefficient = // 1/kilometer
function(_altitude, _wavelgth){
0.003*pow(730/_wavelgth,4.05)
*exp(-_altitude/20)
}



Maybe the air scattering attenuation coeff is about 0.003 1/kilometer at sea
level.

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