Thank you Fen, I Did Exactly like you suggested but it’s the same problem .
this is how the test look like :
as you can see, there’s three different player 1 inside the trigger volume and the other 2 are outside but the outside ones can see the result of the trigger volume effect and what i want is that the only the player in the trigger volume can see the ceiling or the roof half visible and the other 2 can’t see the effect.
and thank you