The object pigment is a discontinuous function with an infinite
gradient, which might factor into some of what you're seeing.

Usually you have to insert a user-made smooth gradient to join up the 2 regions
of the function (inside:outside).  And then the isosurface method that you are
using works just fine.

I've played with this a few times, and Bill Pokorny has ... objectasiso

http://news.povray.org/povray.binaries.scene-files/thread/%3Cweb.4aae23151285f23f15ee2c550%40news.povray.org%3E/

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