For a synthetical planet an isosurface with pigment function is probably a
quite good idea, because you don't have problems with mapping and tiling.  

You might also have a look at:

http://www.schunter.etc.tu-bs.de/~chris/terlinks.html

and

http://www.povray.org/links/3D_Programs/Height_Field_Modelling_Programs_and_Utilities/


Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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