While the x and z dimensions of the contained_by box are obviously up to me,
how do I work out what (sensible) values to use for the y dimensions of, for
example, the following:

#declare MountFunc = function{"ridgedMF" <0.9, 2, 5, 0.75, 2>}
#declare MBase =
isosurface{
  function { y - MountFunc(x,0,z) * min(2, max(0.125,(sqr(x/5) +
sqr(z/5)))) }
  eval
  max_gradient 50
  contained_by{box{<-20,-1,-20>,<20,15,20>}}
  texture{MBaseTex}
}


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