What is relative rotation compared to a normal set actor rotation
Setting the rotation just put in you rotation.
the add relative, will add the rotation you give to your actor rotation.
Lets talk to put this in a thick event .
Using Set actor rotation (0,0,1)
This will set the rotation of your actor , to 0,0,1, again and again , Always to 0,0,1
Nothing will change.
Using Add relative rotation (0,0,1)
This will add , 0,0,1 to your actor rotation, going to 0,0,1+ 0,0,1 = 0,0,2---- 0,0,3---- 0,0,4
in a normal event, that run just for once , you just turn your actor of 1
if you use this in the tick event, you will see the actor Rotate on his Z.
thank you for your answer
Long story short: Absolute rotation is a rotation relative to the world\scene, while relative position is relative to the objects current rotation.