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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