nice iso
here the formular:
  2*(x*x*pow((3-4*x*x),2)+y*y*pow((3-4*y*y),2)+z*z*pow((3-4*z*z),2))-3
  contained_by{box{-1.2,1.2}}
  threshold -.2

rendered with cm-pov

H.Karsten

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