Here's an idea that could help with the problem, but it would involve
patching POVRay. Add an interpolation feature to the heightfield object, so
that POVRay can smooth things out in whichever dimension you select.

For example you could have something like this:

height_field{
  gif "land.gif"
  interpolate <1,8,1>, 1
  pigment{rgb 1}
  translate<-0.5,0,-0.5>
  }

The interpolate value indicates how much to boost the resolution by in that
dimension, and which method to use to do it. Eg here it would boost the
vertical resolution 8 times, using interpolation method 1 (whatever that
gets assigned to).

Rohan _e_ii

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