> Couldn't it be said that POV-Ray does support wavelength-dependant
> scattering, but that it only works with three wavelengths (R,G,B), and you
> must specify the scattering for each one manually?

eh! eh! good question! I'm also waiting for an answer...

Meanwhile I have found a very nice paper about the structure and the
physical properties of the atmosphere (in french):
http://www.techniques-ingenieur.fr/affichage/DispIntro.asp?nGcmId=E4030

From this paper I get this "atmosphere":
http://www.guidevtt.com/Z_Povland/PovRay_atmosphere/SphereAtmosphere3.php

.... promising!... but still not realistic. Probably the main difficulty is
the lack of multiple scattering with povray. Any suggestion?

[Reynald] - www.guidevtt.com

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