Try with an "iso_hf" made this way (slow but versatile)
So did I do the island rocks on this image
http://marc.jacquier.free.fr/Pics/Stock/essais/ile%20bato2.jpg


#declare PigMap = pigment {
  image_map {tga "your_image.tga" once interpolate 2}scale 2 rotate x*90
translate <-1,0,-1>// convert the source image of your hf to pigment
}

#declare Fun1 = function {pigment {PigMap}} //convert pigment to function
#declare Accidents= function {pigment   {wrinkles scale <0.4,0.1,0.4>rotate
x*20 }} //disturbing function, here I use a pigment to be able to transform
it

#declare fn_X = function{(Fun1(x,y,z).gray*0.3)-Accidents(x,y,z).gray*0.1
}

isosurface {

  function {y-fn_X(x,y,z)*1}

  contained_by { box { <-3,-0.20,-3>, <3,1,3> } }

  accuracy 0.1
  max_gradient 8
}


3d9ca584@news.povray.org...
> Still going...
> I do NOT like the heightfield on this, but it's the profile of the cliff
> that I want.
>
> Anyone got any ideas on how to add severe turbulance to it (as i did with
> the stones)?
>
>
>
>

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