Pilz Surface

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pilz st
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The Pilz surface is a algebraic surface given by
  f(x,y,z) :=  ((x^2 + y^2 - 1)^2 + (z -0.5)^2)^2) *
                   ( (y^2/aa^2 + (z + hh)^2 -1)^2 +x^2) -
                    ff * (1 + bb*(0*x^2 + 0*y^2 + (z-0.5)^2))
           default:  ff = 0.28  hh = 0.03

ImplicitCompact.pdf