OnCollisionEnter not working for bullet

HI all,

I have created an object that fires some bullets from a tutorial but I can figure out why the OnCollisionEnter event isn’t firing when the bullet object hits a wall, I just want to destroy the bullet when it hits the wall.
This is the bullet class that I have applied to an empty object which has a prefab linked to it.
public class Bullet : MonoBehaviour {

		public float moveSpeed = 40f;
		public Rigidbody projectile;	
		public Rigidbody clone;

		// Use this for initialization
		void Start () 


		// Update is called once per frame
		void Update () 
			if (Input.GetKey (KeyCode.Space))
				Shoot ();
		void Shoot()
			clone = (Rigidbody)Instantiate (projectile, transform.position, transform.rotation);
			clone.collisionDetectionMode = CollisionDetectionMode.ContinuousDynamic;
			clone.detectCollisions = true;
			clone.velocity = transform.TransformDirection(new Vector3(0,0,moveSpeed));
			Destroy (clone.gameObject,3);


		void OnCollisionEnter(Collision collision) 
			Destroy (clone.gameObject);			

The bullets shoot ok and stop when they hit the wall but even when debugging the OnCollisionEnter method isn’t called.

Any help would be great.

If the bullets are moving fast enough, they can sometimes pass entirely though the wall in between physics updates. (Slow them waay down and see if the problem’s still there. If it is, ignore the rest of this post.)

Assuming that fixed it, all you need to do is have your bullets raycast ahead of themselves and run your destroy script when they either hit the target or would hit it by the next frame.

The OnCollisionEnter will only be called on scripts that are attached to the wall or bullet. The script you posted is not attached to either so OnCollisionEnter is not called. That Bullet script just instantiates the bullet and sends it on its way. Add OnCollisionEnter to a script attached to the bullet prefab or wall and it should work.