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Wow. Beautiful math. Such insight. Thank you for sharing.

  var PI2 = Math.PI * 2.0;

That should be Math.TAU, right?

It's much better than this:

OK, what the hell is going on here?

"powers of three" - see the comment on line 653 [1] of the same file

Javascript doesn't have a TAU constant in it's Math object (yet). He could have added it with Math.TAU = Math.PI * 2; though.

Exactly.

Or alternatively continued to use PI2 like basically everybody else on the globe who wants to actually use it for things.