Entity is facing another ?

[YouGroove]

I would know how to to for :

Know if a character is facing a golbin within some angle.

 

How to calculate that angle ?

 

I am trying to achieve somehting like :

 

If player.AngleToEntity(Goblin) <45 then
  player.facingGoblin = true
end 

 

I gonna throught Goblin script, found Atan and Yaw variables but didn't understood how it works ? how ot use it ?