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"Bruno Cabasson" <bru### [at] alcatelaleniaspace fr> schreef in bericht
news:web.473446d07579baf9e8ba46670@news.povray.org...
> Here is an illustration for atmosphere, considering pure atmosphere. The
> only
> changing parameter is the elevation of the sun (simple looks_like white
> sphere
> at the moment).
>
> You can obtain different colors (including reddening/decay) by tweaking
> some
> parameters like the color of the scattered blue (rgb <0.25, 0.65, 1>
> here), the
> power of the sun, and parameters controlling the density function
> (basically:
> exp(-k*h/T), k=mult.factor, h=height at the given point, T=constant
> thickness
> of atmo). You can also add absorption, but I prefer leave that to cloud
> layers.
>
> The camera is at 2m above the ground. When you put it higher, you get a
> deeper
> blue automatically because there is less gaz above you: the blue is less
> scattered and the blackness of deep space contibutes more.
>
Excellent! That looks very intuitive to use. For skies I usually like to use
LightSysIV, but there the problem is that I do not really understand the
background and the correct way to change things. Your method seems really
simple for the end-user. I suppose that, given the correct parameters, you
could simulate a Martian sundown for instance as easily as a terrestrial
one.
Thomas
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