Wasn't it Oleguer Vilella who wrote:
>Hi all,
>
>An easy question:
>
>I want to add color modifiers as granite, finish and normal in a sky_sphere. 

The sky_sphere takes a pigment, not a texture, so you can't have a
normal or a finish.

You could replace it with a sufficiently large sphere, in which case
also consider whether you also need to use finish {ambient 1},
no_shadow, and hollow. The sky_sphere object automatically has the
equivalent of those settings, but if you need them on a sphere object
you have to remember to specify them.

-- 
Mike Williams
Gentleman of Leisure

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