Room Visitor

The Room Visitor interface is useful to add behaviors to your actors or components when they enters or exit a room.

You can use this interface to keep track of the rooms the actor is in to be able to call functions on them, change some [[Room Custom Data|Room Custom Data]] variables, display various details on player's HUD, etc.

For example, the [[Room Visibility Component|Occlusion Culling]] (used to show/hide an actor with the rooms it is in) is implementing the Room Visitor interface to bind/unbind to the room's visibility event dispatcher when the actor enters or exits any room, and thus can change its visibility according to the room visibility state.

How to use it

Just add the interface like any other interface in Blueprint or C++, and implement its functions.

For example, this is a simple implementation in Blueprint to keep a reference of the rooms an actor is in (stored in an array called Cached Room Array).