#declare F_Earthslice = finish {ambient 0.05 diffuse 1 brilliance 0.25 }

ambient 0.05 seems incredibly low, but diffuse 1 ought to be fine.

This leads me to question: Where is your light source and at what angle does it
impinge upon the surface?

Render a shadowless cylinder from your light source location to the
ApproxLook = <-3347983.0848,4226003.8087,3406932.3387>;
vector to see for sure.

Right now you're flying blind and feeling around in the dark.

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