It would also be awesome to customise the directional plane upon which
the spiral is generated. It might actually be possible without melting
my brain I think....
Looking at http://www.mathematische-basteleien.de/spiral.htm it should
be possible to go this for circles too. But there's 1 particular
function in Vector2.js that we need to port to Vector3.lua that we
haven't yet which we'd need for that.....
