show mesh when camera rotate ?

I want to know how to show this Cylinder by camera rotation

when the player enter the collision the Cylinder visibility will be off but if the player rotated 180 degree in Z Axis than turned back the cylinder visibility will be on

Like this for example : P.T. - SILENT HILLS - PS4 - WALKTHROUGH - FULL DEMO - FINAL SOLUTION - SPEED RUN - ITA - 1080P HD - YouTube letters disappear when he rotate

I think you can set up an event that is called when player enter the collision area, which will keep updating while user remain inside that area, when player character rotate to a certain value in Z axis, you set up flag A, then if player character rotate to another value in Z axis, if flag A have been raised then you change that mesh visibility.