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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_Light_Beam_ <fac### [at] aolcom> wrote:
> #declare terrain = function {image_map here...}

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

> But this function doesn't work....

  Perhaps because the image is oriented in the xy-plane, not the xz-plane?

-- 
#macro N(D)#if(D>99)cylinder{M()#local D=div(D,104);M().5,2pigment{rgb M()}}
N(D)#end#end#macro M()<mod(D,13)-6mod(div(D,13)8)-3,10>#end blob{
N(11117333955)N(4254934330)N(3900569407)N(7382340)N(3358)N(970)}//  - Warp -

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