Mr schrieb:
> Following my previous attempt, I am now trying to do the same thing with a
> sky_sphere with a gradient pigment in it instead of the flat "background" (maybe
> I can use a gradient with background?)

No, "background" is only useful for cases where you want a single color 
for the background. That's what sky_sphere is for.

> Anyway, It doesn't seem to behave the
> same:
> when I put RGBT colors with value 1 for transmit of both colors in the colormap,
> it results in a non colored background what I would want is a colored gradient
> from horizon to zenith but still a flat sky matte in the alpha channel...

Same does (or at least should) happen with "background" when you use 
RGBT colors with 1 for transmit.

Maybe what you really want to achieve needs filter instead of transmit?

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