Pretzel Surface

Additional images: Anaglyph, Parallel Stereo
The Pretzel surface is an algebraic surface given by
  f(x,y,z) :=  (((x-1)^2 + y^2 - aa^2) * ((x+1)^2 + y^2 - aa^2))^2 + z^2 

See also: ImplicitSurfaces.pdf


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