> Hi!
> I understand nothing.
> Or I am already tired?
> I attach a scene.
> Sky_sphere is declared, but background transparent.
>

The default background colour is black. You did not change it, so, it's 
still black.

Your sky_sphere is all black:
"sky_sphere { pigment {rgb<0.000, 0.000, 0.000>}}"

It's thus impossible to see it at all. It's not transparent, just the 
same colour as the default cackground.
In this case, it's beter to simply set a background colour: 
background{rgb<0.2,0.001,0.001>} // Dark red

Try giving your sky_sphere another colour, or some pattern.
Try using just a plain background, again, using some other colour than 
black.



Alain

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