This partially work, it give me a value of 0 when in front and 180 when behind, but the value is always positive… So I cannot determine wether the actor is to the left or right of the player. But the angle is good haha.
Substracting the actor’s Location from the player’s location give us X and Y values wich reprensent the sides of the triangle we are grabing the angle from using ACOSD, Right?