[Solved]Avoid multiple objects triggering collision during same frame

EDIT:
Not sure if there actually were multiple collisions, been a long day. but using bools on both objects to double check gives me the results I wanted: No matter how many objects A bump into how many objects B, only one of each can connect.


OLD QUESTION:

I have an object A which is supposed to call an event when it hits object B, and I only want that function to run once. The problem is when multiple objects B hit object A in the same frame. Using a bool or switching layers thus becomes useless. To complicate the matter I have a lot of objects A and B.
I tried using a simple timer.

Code (CSharp):

1. private void OnCollisionEnter2D(Collision2D collision)
2.     {
3.  
4.         collisionDelay = 0.1f;
5.      
6.            //layer 8 does not collide with anything else
7.             gameObject.layer = 8;    
8.    
9.     }
10.  
11.     private void Update()
12.     {
13.         if (collisionDelay > 0)
14.         {
15.             collisionDelay -= Time.deltaTime;
16.             if(collisionDelay <= 0)
17.             {
18.                  DoAwesomeStuffButOnlyOnce();
19.  
20.             }
21.         }
22.     }
23.  

It is however an unclean solution and doesn't lead to perfect results. Any better ideas?

 

Thanks for sharing this.
After many hours of searching and debugging – it worked for me too!