> success, the surface could not be mathematically represented 

> Z=sin(X*Y).

Looks like a mathematical representation to me. If your
surface is of the form z=f(x,y) it can be rendered as an
height_field object. Note that the function must be
scaled such that z is in the range from 0.0 to 1.0.

height_field
{
   function 512, 512 {0.5+0.5*sin(1.5*x*y)}
   pigment {color White}
   translate -0.5*x
}

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