before i ask my question, let me see if i have something straight: 
height fields are converted into meshes, right?  now, if this is so,
what happens to the ends and the bottom?  are they closed off to get a
closed volume?  i'm hoping they are.  and if they are, can they be used
in CSG operations?  that is the question i really want to know.  i'm
thinking it would be cool to take one height field of a landscape, and
another of the opposite of a horizontal cave system, and them subtract
the caves from the landscape.  or... if one could subtract various
shapes from a height field (like cylinders or cubes) to get caves that
way.  can it be done?

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