f_heart has a little crease at its equator.

I figured out that at least PovRay 3.7 has no crease with:

isosurface {
  function { (2*x*x+ y*y+ z*z- 1) - pow((x*x/10 + y*y),1/3) * z  }
        accuracy 0.001
        max_gradient 5
        contained_by{sphere{0,1.5}}
        pigment {rgb .9*x}
        finish {phong 0.5 phong_size 10}
}

:-) please include in further versions of povray

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