Overlapping objects detecting the player, and regulating active states based on his position

Unity Engine
1

Hi, so I have an odd question. I have some objects that activate when the player is inside of them, and deactivate when the player leaves. I want to be able to overlap them and still only have one active. specifically, the one the player most recently entered to still be active. I have tried for the last 8 hours to put the individual objects IDs into a list to try and determine which one is the “current room”. I think (due to 8 hours of failing at simple math logic) I’m doing something hard, rather than smart. Anyone have any idea how I could make these objects know when to shut off even if the player is technically still inside them?

2 
public class Room : MonoBehaviour
{
   private static List<Room> rooms = new List<Room>();
   private static Room currentRoom = null;

   void OnEnable() { rooms.Add(this); }
   void OnDisable() { rooms.Remove(this); }

   void OnTriggerEnter(Collider other)
   {
     Activate();
     currentRoom = this;

     // turn off old rooms:
     foreach(Room room in rooms)
     {
       if(room != this)
          room.Deactivate();
     }
   }

    void OnTriggerExit(Collider other)
    {
       // only turn off if we're the active room:
       if(currentRoom == this)
       {
           Deactivate();
           currentRoom = null;
       }
    }
 

   // whatever you want to happen:
   public void Activate() { }
   public void Deactivate() {}
}
3

Hrmm…Okay, Thanks! I’ll play around with it a bit and post again when I get it working. :slight_smile:

4

Okay, so newbie question, I have a very basic idea of what the code actually does, and I’m not exactly sure where I would put the boundaries. does “this” get the current object or is it just a placeholder?

5

this means the current object, so room script in this case. So anytime you enter a new room’s trigger, it turns off every other room except this one. Is that not what you want?

6

It is indeed what I want. I was simply trying to understand what process it takes to do what it does and how to use it, because I am still a neophyte C# creature, and a rather inexperienced coder in general.

[
So to confirm, It makes list Room, which can contain instances of this script.

When the script is enabled, it adds itself to the list, and removes itself when disabled.

When we enter a new room (OnTriggerEnter), which takes a collider (the collider of the new room), set the instance of Room to currentRoom and calls activate();

when we enter a new room, it checks the list Room to see if this instance of room is contained. if it is not inside of it calls deactivate.

If a Room script instance is inside list room, and it is not the current instance, call on whatever instance of room that is Deactivate().

When we exit a room, if this instance of room is set to be currentRoom, deactivate the room set currentRoom to null.
]

And all of this would be attached directly to whatever object has the boundaries. Okay, so currently my boundary objects consist of a parent, that checks to see if the player is inside of it, and a child, which the parent activates/ deactivates depending if the player is inside/ outside of the parent. The camera gets it’s boundary from the child.

So with this script I would not need the parent-child system, and I could attach it to the parent object, while getting the boundary information for my camera from whether or not the script-attached-GameObject is inside of list room, instead of whether its active or not?

7

I’m not sure why, but OnTriggerEnter and OnTriggerExit are not being called. The GameObject the script is attached to has a BoxCollider2D set to Trigger, and the player has a BoxCollider2D and a CircleCollider2D. Is there anything I’m missing to make this work?

8

I am a blockhead(as opposed to square). I didn’t see there was a 2D option for the OnTrigger methods.

9

Did you get it sorted? Sorry for my late response: the trigger should go around the entire room, not individual objects within, since I assume you want to turn the entire room off or on.

10

Yes and no. I got it working perfectly (mechanics-wise) but I opened a new thread due to an error I was getting.

11