Geez...  Maybe you could explain to me how to modify my isosurface.
My problem is that I don't actually want a coil, I want much more, but
as a start, a coil would be fine!

Is it possible to have my isosurface make a "round" shape on the z axis
between (-x), (x), (-y) and (y), given a sinusoidal function that I
would define myself like this:
#macro myFunc(xy, z)
  #if(xy == 0)
    d*cos(z)
  #else
    d*sin(z)
  #end 
#end

(not sure if syntax is alright, but that's what my function would
basically look like)

Thanks Mark,
  Simon

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