#declare Pedantic=true;

It is really not necessary to use a special shape to model an entire
planet.  Earth's tallest mountain (Mt. Everest) is 8848 meters high; the
radius of the Earth is about 6366 kilometers.  On an 800x600 image
depicting the entire planet, situated such that Everest was on the very
edge of the disk, the height of the mountain would be about
300*8848/6000000 = roughly .41 pixels.  Anti-aliasing will turn this
into a bit of fuzz at the edge of the disk.

To get the shadows of mountains, use a normal pattern in the texture.

#declare Pedantic=false;

Sorry, couldn't help myself.

Regards,
John

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