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	You can do it like this, I think (untested):

#declare SIZE = 2.0;
#if (HF)
~  height_field{function 300,300{P(x*SIZE,0,y*SIZE)}
~    translate <-0.5,0,-0.5>
~    scale <4,0.75,4>*SIZE
~    pigment{G}
~  }
#else
~  isosurface {
~    function { y - P(x,0,1-z)}
~    open
~    max_gradient 7
~    contained_by{box{<0,0,0>,<1,1,1>*SIZE}}
~    translate <-0.5,0,-0.5>
~    scale <4,0.75,4>
~    pigment {G}
~  }
#end

- --
******************************
*      Jerome M. Berger      *
* mailto:jbe### [at] ifrancecom *
*  http://jeberger.free.fr/  *
******************************
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=Witz
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