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"Bruno Cabasson" <bru### [at] alcatelaleniaspace fr> schreef in bericht
news:web.4732e7267579baf9e8ba46670@news.povray.org...
>
> Oohh. I missed this discussion! The results are VERY good!
>
> Having a look at the source code, I confirm that I have a similar
> approach, but
> maybe a little more advanced and closer to nature's laws. Some colors were
> obtained by applying a non very natural values to the scattering media of
> the
> atmosphere, like "scattering{1 rgb .01*<1,.8, .6> extinction 0}".
>
> In RL, atmosphere's colors (blue at daytime, yellow/orange/red-ish at
> sunset)
> are due to Rayleigh scattering (type 4), plus eventually some other media
> (scattering/absorption of specific colors) for non-pure air particles or
> pollution. In addition, as explained in the documentation, extinction is
> always
> 1. Clouds are type 2 (or 3 in some cases) scattering media. They usually
> have no
> coloring behaviour themselves and are only white-scattering. Clouds are
> tinted
> by the scattered light coming from the sun and neighbourhood. That's what
> I try
> to reproduce.
>
> In order to make sure of the realisticness of some of my skyies, I try the
> same
> scene with different elevations of the sun, only changing the sun's power
> to
> compensate illumination decrease. I'll render one with only the atmosphere
> at
> different elevations to illustrate.
>
I am really impressed. I wait impatiently for further developments along
these lines. I sure am interested!
Thomas
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