Oleguer Vilella <ole### [at] infonegociocom> wrote:
> I want to add color modifiers as granite, finish and normal in a sky_sphere. 

  Finish and normal would make no sense in a sky_sphere because a
sky_sphere is not an object and is not illuminated by any light source.

  Basically, a sky_sphere is a pigment, no more, no less. When a ray
does not hit anything, then the color for that ray is taken from that
pigment depending on the direction of the ray (and depending only on
that; eg. the starting point of the ray has no effect).

  Thus rays do not hit the sky_sphere (because it's not an object),
intersection calculations are not done, reflected/refracted rays are
not calculated, illumination is not calculated. There can't be
anything "behind" the sky_sphere and nothing, absolutely nothing
can interact with it.

  If you want a real object, then use a big inverted sphere centered
at the camera location.

-- 
                                                          - Warp

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