Five Easy Pieces
Rotating truncation of the tetrahedron.
Source code: https://community.wolfram.com/groups/-/m/t/1660413
@shonk Super smooth animation, striking color choice... and it's not every day I see "Haversine" in use. (In fact, I'm not sure I've ever seen haversine anywhere except rather old textbooks and tables of trigonometric values)
@jsiehler Haversine is actually surprisingly useful if you want to smoothly interpolate between \(f(0)=0, f'(0)=0\) and \(f(a)=1,f'(a)=0\).
I also sometimes use the polynomial smoothstep/smootherstep/smootheststep functions: https://en.wikipedia.org/wiki/Smoothstep
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