Cube - smooth algebraic surface

Cube, a smooth algebraic surface of degree six. This is the set of real points for which
```
x^6 + y^6 + z^6 -1 = 0.
```

Is everywhere smooth! Not an actual cube; you get a cube if you replace the 6 in the equation by infinity, but then it's impossible to compute...

I have provided these files:
* `Cube_fixed_Blocky.stl` -- has the normal vectors fixed.
* `Cube_fixed_Med_Smooth.stl` -- the blocky version, normal vectors fixed
* `cube_raw_blocky.stl` -- raw triangulation coming fr