Destroy On Collision

Questions & Answers
1

I got a rocket that follow you until it collide with something and explode.
I wrote a simple code for the collision. The problem is that the rocket don’t explode when it should: it fly through walls , touch me but continue to fly around, it explode only when I shoot on it.

The code I wrote shoulde make it explode when it collide with anything that have a collider, trigger or not:

var explodPrefab : Transform;
var spawnPoint : Transform;

function OnCollisionEnter (hit : Collision)
{
   var exp = Instantiate(explodPrefab, spawnPoint.transform.position, Quaternion.identity);
   Destroy(gameObject);
}

function OnTriggerEnter (hit : Collider)
{
   var exp = Instantiate(explodPrefab, spawnPoint.transform.position, Quaternion.identity);
   Destroy(gameObject);
}

Note: all the game objects have a collider on them.

Why this is happening?

2

Based on your description, I don’t think your collision detection is working correctly. Do both your rocket and the object it is colliding with have colliders on them? Both will need a collider for a collision to be detected.

3

Replace it with

Destroy(hit.gameObject);
4

I read somewhere that for fast moving objects the collider will pass through objects without triggering a collision (ie gets past object between ‘updates’). Try making the collider bigger or slowing down the rocket.

5

Try the script from the first person shooter tutorial. Script also assumes you have a particle emitter attached for the rocket trail.
I use this and it works perfectly.

// The reference to the explosion prefab
var explosion : GameObject;
var timeOut = 3.0;

// Kill the rocket after a while automatically
function Start () {
	Invoke("Kill", timeOut);
}


function OnCollisionEnter (collision : Collision) {
	// Instantiate explosion at the impact point and rotate the explosion
	// so that the y-axis faces along the surface normal
	var contact : ContactPoint = collision.contacts[0];
	var rotation = Quaternion.FromToRotation(Vector3.up, contact.normal);
    Instantiate (explosion, contact.point, rotation);

	// And kill our selves
	Kill ();    
}

function Kill () {
	// Stop emitting particles in any children
	var emitter : ParticleEmitter= GetComponentInChildren(ParticleEmitter);
	if (emitter)
		emitter.emit = false;
		

	// Detach children - We do this to detach the trail rendererer which should be set up to auto destruct
	transform.DetachChildren();
		
	// Destroy the projectile
	Destroy(gameObject);
	
}


//@script RequireComponent (Rigidbody)