I seem to remember reading that the atmosphere density drops off
exponentially with a scale of 8.4km, and that air scattering for blue
frequencies is 15 times that for red. These are the values I use for
atmospheres, anyway.

Bye for now,
	Mike Andrews.


> 
> Hi Tracers!
> 
> Currently I'm working on a not-too-large project, a view over Earth from
> an altitude of about 300 to 600 miles, with the sun not much above the
> horizon, just casting the first morning light on the surface before the
> viewer (at least finally; at the moment I would even be glad if it
> worked correctly with the sun overhead).
> 
> As I still have dug somewhat into PoV 3.1, I think it would be doable
> only when placing a transparent (hollow!) outer atmosphere sphere around
> the solid Earth body (the atmosphere with a radius of 6.528 km compared
> to 6.378 km for the planet itself) and then filling this sphere with an
> interior/media, setting emission color and scattering etc.
> 
> But whatever scattering mode I use, I never get the blue gradient
> atmosphere seam along the horizon familiar from real images shot from
> orbit...  can anyone here help me further?
> 
> See you in Khyberspace!
> 
> Yadgar

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