Greetings again!

I am searching for a way to have lights (ambient 1.0) only in shadow regions 
of a planet. Does anyone know a way to do that?

At the moment, I have a made a planet out of three layers: the planet itself 
(a sphere with a high-resolution image map), another sphere with a 
semi-transparent PNG map at ambient 1.0 for the city lights, and a sphere 
with a semi-transparent PNG map for the clouds.

Altogether, it looks quite okay, but with this technology there are lights 
on the dayside of mother earth, as well. And I really would prefer if my 
citizens would prefer to "save energy" on the dayside...

Any suggestions?

Greetings,

Sven

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