From recent postings in unofficial patches.

Mountain code:
#declare MountFunc = function {"ridgedMF" <0.3, 4, 6, 0.45, 1.9>}
#declare maxH = 5;
#declare MBase =
isosurface{
  function {y - MountFunc(x,0,z)*1*max(0,sqrt(z))}
  eval
  contained_by{box{<-5,-0.1,0>,<5,maxH,maxH*maxH>}}
  texture{MBaseTex}
}
object{MBase scale<150,150,150> translate z*160}

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