I meant to include the relevant portion of the file...

/// Begin
#declare Wall = function { pigment { Stones } }

isosurface { function ( z-Wall(x,y,z)*0.1)
                  sign 1 eval
                  accuracy .005
             texture { pigment { Stones2 } }
             scale < 3.0, 1.0, 1.0 >
           }

/// End

"Chris Huff" <chr### [at] yahoocom> wrote :
>
> This can be fixed by leaving one dimension out, like func(x, y, 0).
>

    I'll see what that does...

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