Distel - smooth algebraic surface

Distel, a smooth algebraic surface of degree six. This is the set of real points for which
```
x^2+y^2+z^2+1000 * (x^2+y^2)*(x^2+z^2)*(y^2+z^2)-1 = 0.
```

Has no holes! Has no singularities! Is actually smooth at its points! Not actually pointed! Topologically equivalent to a sphere!

I have provided these files:
* `Distel_Super_Smooth.stl` -- sampled to decently tight tolerances.
* `Distel_Newsmooth.stl` -- surprisingly, an older version of the sampler was used to refine it. Tak