Yup, I shared it in an other thread.
It's the "GetSignedAngleVertical". Same as the classic GetSignedAngle, but only gets the angle around the "X" axis. This way, combining it with the classic one, I can get an angle with two floats, useful for making an NPC aiming through the animator for example.
Here are this one and the old classic one, all made to work with 1.8.5 and prior thanks to the guide :-)
Also I was wondering, isn't there a better way to get a signed angle or a 360 angle than using Atan2? It seems to be pretty heavy...
Edit : I just created a thread with a bunch of actions that I use to change the graphic settings at runtime (LOD, texture resolution, shader LOD etc...) Check it out! :-D