'Bullet' object triggering multiple colliders on enemies in same position before destroying

Pretty much title. I have an object that my player shoots that acts like a bullet but can bounce of walls etc.

Since this game is a 2D platformer, with the basic enemy movement i have at the moment, enemies of the same type get clumped together in the exact same position and so their colliders are in the same position. What happens is my 'bullet' object hits the clumped up enemies, dealing damage to all of them (since it hits all the enemies) before destroying itself.

How do i get the 'bullet' object to only hit one enemy when they are in the same position as another enemy?

Thanks.

 

How is your bullet object set up?

Typically, I would have a boolean variable on the bullet which records whether or not it has already dealt damage. When a hit is detected, check the value of this variable before dealing damage. If the value is "false" then deal the damage and set it to "true". If the value is already "true" then do nothing.

 

The bullet destroys itself on collision. Surely the boolean wouldn't change anything?

OnTriggerEnter2D is called on the enemies at the same time, the bool wouldn't change this, right?

 

If you're not using DestroyImmediate then yes, boolean might change a lot. My personal way of doing bullets like this one is to save collision info on first collision enter, disable collider and rigidbody, handle collision in next Update, destroy the bullet (usually after playing hit animation).

 

The bullet enters the triggers at the same time though since they are in the same position?

EDIT: Tried the boolean and it didn't work..

 

The movement is not continious, therefore it is possible to collide with multiple objects at the same time. In this case unity will call collision enter function multiple times per frame. If you save disabled the collider at first call, next calls won't happen. That's the solution to your problem.

 

Destroy schedules the object to be destroyed before the next frame. It does not immediately destroy the object. DestroyImmediate does that, but destroying an object in the middle of a frame can cause its own problems, and is specifically not recommended in the documentation. The bool solution is the simple fix.

 

Can you please show us what you've got? Until we've got details we're just guessing.

 

Yep sorry.

Enemy class

Code (CSharp):

1. void OnTriggerEnter2D(Collider2D col){
2.  
3.         body = gameObject.GetComponent<Rigidbody2D>();
4.  
5.  
6.         if (col.gameObject.tag == "Attack"){
7.             float knockbackForce = col.gameObject.GetComponent<AttackClass>().knockbackForce;
8.  
9.             // Add all enemies that can't be knockbacked here
10.  
11.             if (type != "Ghost"){
12.                 knockback(knockbackForce, col.gameObject);
13.             }
14.             takeDamage(col.gameObject.GetComponent<AttackClass>().baseDamage);
15.         }
16.        
17.     }

'Bullet' class

Code (CSharp):

1. void OnTriggerEnter2D(Collider2D col){
2.  
3.         if (col.gameObject.tag == "Enemy"){
4.             // AudioManager.GetComponent<AudioManager>().PlaySound("Pop");
5.             Destroy(gameObject);
6.         }
7.        
8.     }

 

I know this is old, but I think I have the solution.

Code (CSharp):

1. void OnTriggerEnter(Collider other) {
2. damageEnemy(damageAmount);
3.  
4. // This is important
5. GetComponent<Collider>().enabled = false
6. }

s