Throttling or adding delays between OnTriggerEnter2D calls

Question

I have 2 game objects: Explosion and Enemy. At any given point, an enemy can collide with multiple Explosion game objects at the same exact time. This causes a few issues when I'm trying to destroy the Enemy game object.

This is the function that destroys the game object:

bool isDead = false;

public void KillCharacter () {
  if (!isDead) {
    isDead = true;
    Debug.Log ("kill enemy...");
  }
}

If I use OnTriggerEnter2D inside the Enemy script, like so:

void OnTriggerEnter2D (Collider2D other) {
  if (other.gameObject.tag == "Explosion") {
    KillCharacter();
  }
}

In case two explosions spawn on the position of the enemy, Debug.Log inside the KillCharacter function will fire twice, even though I set the isDead bool to true on the first run.

The only solution I found was to call KillCharacter from the Explosion script, like so:

void OnTriggerEnter2D (Collider2D other) {
  if (other.gameObject.tag == "Enemy") {
    other.gameObject.GetComponent<Enemy> ().KillCharacter ();
  }
}

Is there a way to run the OnTriggerEnter2D from the Enemy script, as I originally intended? Or is having the KillCharacter handle all the death logic and calling it from outside good enough?

Answer 1

Tested your question and code out as at first I thought it was regarding the 'Is Trigger' option on the collider. However, it's working as intended.

As shown here: https://imgur.com/a/oPJMFTl.

The script is on the Enemy tagged object. Tested with the 'Is Trigger' checked on one and both of the Objects "Enemy", "Explosion".

The only thing I changed from your code was set the bool isDead to public so that it shows on the inspector.

Most likely problem is that your bool isDead is being altered elsewhere.