Windows leaving collision

[Gizimo]

I'm creating rooms that are black before you enter them. When the player enters the room become visible but it remains that way permanently, I would like the rooms to become dark again after the player leaves.

 

[NightFrost]

Well you... do the opposite when making them visible? I mean, since you are able to make room content visible, somewhere in your code something does know what things to change. I assume it flips visibility states on instances. Judging by the topic name, you have a collision object which, upon hitting the player, runs through this procedure to reveal room content. So you could do something like this: make the collider cover the entire room. Give it a variable that tracks covered room's visibility (a true/false boolean, starts in false). Then step event code runs the following logic:

if visibility variable is false:
   if player is in collision with this instance:
      make room contents visible
      set visibility variable to true
else if visibility variable is true:
   if player is not in collision with this instance:
      make room contents invisible
      set visibility variable to false

You can freely stretch content in room editor, so it should be easy to cover each room just so.