> So my final idea was kind of a cheat: to color the planar surface
> with a gradient y pigment, receding into the surface--somewhat dark
> at the very surface, then immediately lighter, then falling to
> darkness again to the bottom of the pits. And using two area lights
> to either side.

   That looks almost perfect to me, at least for that particular SEM
picture posted by kmcpeak. And "cheating" seems more or less obligatory
here, as SEM photography doesn't involves lighting at all...

--
Jaime

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