Ammar <a.a### [at] ueaacuk> wrote ...
> Hello All
>
> I am currently working on a project to render skies using physically
> accurate or t least approximate colours and intensities. I have been
advised
> to use POV-Ray simply because it is a very good ray tracing program. My
> knowledge of the language is very bad and I am struggling to use it.
> I have gathered all the equations to implement my model, but I am
completely
> clueless as to how POV-Ray works. I would be very greatful if anyone could
> provide with a skeleton program that would setup the scene for me. That
is,
> create the earth and sky spheres and postion the view on the surface of
the
> earth looking at the sky.
>
> Then I can use that to change the colour of the sky based on equation I
> have.
>
> I would like to apologise for this, but my POV-Ray knowledge is very bad
and
> I am starting to panic !!!

For the most physically realistic output, you should use a sky sphere that
contains scattering media.  You would want to use a media that scatters
mostly blue light (as the earth's atmosphere does).  This has been done in
the past and it has produced very realistic skies.  Check out the message
titled '"Rust and Sky" source" in povray.text.scene-files for some code that
creates an atmosphere using scattering media.  You can modify the scattering
properties to produce different looking skies.  This technique will even
produce sunset colors if used properly.

-Nathan

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