Ok, but I guessed a "simply" way... for example :

#declare terrain = function {image_map here...}

isosurface {function {y - terrain(x,0,z)}}

But this function doesn't work.... that made a kind of box and my image-map
is not well-used to make the terrain, just a kind of bumps on the top of the
box... scaling doesn't work too... I'll cry...

 (Do you understand my English... ?)

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