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V.v.v.v.v.v.v.v.v.v.v. nice whats the render time like on these?
"Abe" <bul### [at] taconic net> wrote in message
news:4081f656@news.povray.org...
> Continuing with the idea of shading a 2D texture to appear 3D.
>
> The trick seems to be to pick a point and march along a ray on the sky
> plane toward the sun, sampling the 2D cloud texture along the way. Based
> on the samples collected, the point is assigned a degree of
> "illumination" or brightness.
>
> I have a lot of fun with the idea, but so far my implementation is no
> where near as elegant as I think it could be. Come to think of it,
> writing it as a shader for POVman might be smoother.
>
> What's here is a set of layered textures which have the following tasks
> (in order): sky color, sun and sun glow, base cloud color, cloud
> illumination, haze, flare.
>
> What's not here is any attempt at implementing pronounced forward
> scattering or multiple scattering effects. There is also no
> comprehensive model which steers the different colors - they are all set
> individually through trial and error (and will probably still be off
> when I get a chance to look at them on a CRT!).
>
> Abe
>
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