Small example but could be useful to someone.

Simply attach the script to a bunch of entities and they will berotated to face the first one (the first one will rotate to face the second).

Strictly speaking you could do this as a static example with simple maths (or you would thinks so) especially if you only wanted rotation in one plane (like how decals work at present) but if you need a dynamically facing version with rotation in two or three planes then quaternions are the way to go.

I may return to the quaternion library at some time in the future to add SLERP, if anyone has a burning need for it let me know (if you don't know what it is then you probably don't have a burning need! ).

Thanks AmenMoses. I will try to test this tonight with respect to my original message to you.

Code like this is literally the only reason I regret not going to College before going to industry; I could have used the Calculus I/II/III coursework to help understand it better, rather than learning it as a hobbyist many years later.

What's college? I'm completely self taught.

Self taught! That's awesome man!