OnTriggerEnter being called twice (119687)

Questions & Answers
1

So, I’m starting to play with Unity3D. I’m trying to make a double shot for my “Space Shooter” project.

Anyway, I’ve set a script for the bullets that have a function OnTriggerEnter. The bullet prefab is set to isTrigger and everything is working properly.

There’s a litte problem though: The function makes a call to a function that updates the score. And, because the two bullets hits the object at the same time, it gets called twice.

I’ve searched for a solution and I couldn’t find anything that worked. I could make a variable “numberOfHits” and make decreases on it, but I think it’s not a good solution.

Here’s my script:

private var isCollision : boolean = false;
function OnTriggerEnter(other : Collider){
	//Check for astroid
	if(other.gameObject.tag == "enemy" && !isCollision){
		isCollision = true;

		//Reset the position of the enemy
		other.GetComponent(scriptAstroid).ResetEnemy();

		//Create the explosion on impact
		if(explosion){
			Instantiate(explosion, transform.position, transform.rotation);
			audio.PlayClipAtPoint(fxSound, transform.position);
		}

		//Tell scene manager that we destroyed an enemy and add a point to the score
		sceneManager.transform.GetComponent(scriptSceneManager).AddScore();

		//Destroy the bullet
		Destroy(gameObject);
	}
}

On the update function, I reset the isCollision variable to false again. But, because the two bullets hits the enemy AT THE SAME FRAME, it doesn’t matter.

What do you guys suggest? Thanks in advance.

2

If you want your Enemy only receiving 1 bullet hit, then put the isCollision bool check in the Enemy, not the bullet.