I just want a function to tell me the height at a particular coordinate of a
heightfield.  That way I can programatically place objects at the surface of
the heightfield instead of having to place objects by hand with
trial-and-error or externally with a program.

Imagine if you will... Romans charging across a "Khaki" rippling HF plain in
close regular but randomized formation.  Or barbarian blue-skinned celts,
wild-eyed and naked skewered on roman philum.

Seriously, a cohort of soldiers flowing across the crest of a heightfield
would be much more impressive and interesting to look at than ranks of them
lined up on level "boxes".

Towns and villages could be contoured to the terrain giving much more
realistic "spaces".

Owwww heck... just getting the trees to set right on the landscape would be
nice.

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