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"Afishionado" <afi### [at] gmail com> wrote in message
news:web.43c5a940743b370581cca5e40@news.povray.org...
> I'm wondering: Would it be feasable to use radiosity with a sky sphere to
> generate HDR-ish effects from within Pov-ray?
>
> Since sky_spheres only take pigments, not full textures, I can't see how
> to
> do it directly with a sky_sphere. If I simply apply a sky_sphere pigment
> to
> a scaled up sphere, the pigment gets all messed up, because sky_spheres
> map
> pigments differently than a normal sphere.
sky_sphere {
pigment {image_map {hdr MAP once interpolate 2 map_type 1}}
}
Sky_sphere shouldn't map different then a sphere, but what does happen is
that a sky_sphere is infinite, whereas a sphere isn't, so depending upon the
size of the sphere and the location of your camera, the scene can look
different because of perspective. Try using a larger sphere to minimize
this.
One advantage that a sphere has over a sky_sphere is that it has a finish
block so you can increase the ambient value to increase the radiosity
influence of the HDR, whereas with sky_sphere, it is much more difficult to
do.
Hope that helps a little.
-tgq
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