Collide with anything, spawn an explosion prefab. Useful for missiles, grenades, etc

unity: explosion2

using UnityEngine;
using System.Collections;
 
public class OnCollideExplode : MonoBehaviour 
{
 
// A grenade
// - instantiates a explosion prefab when hitting a surface
// - then destroys itself
public GameObject explosionPrefab;
public float      explodeSecs = -1;
 
void Awake()
{
		if(explodeSecs > -1) Invoke ("DestroyNow", explodeSecs);
}
 
void OnCollisionEnter( Collision collision ) 
{
	// Rotate the object so that the y-axis faces along the normal of the surface
	ContactPoint contact = collision.contacts[0];
	Quaternion   rot     = Quaternion.FromToRotation(Vector3.up, contact.normal);
	Vector3      pos     = contact.point;
	Instantiate(explosionPrefab, pos, rot);
	// Destroy the projectile
	Destroy (gameObject);
}
 
void DestroyNow()
{
	Instantiate(explosionPrefab, transform.position, transform.rotation);
	Destroy (gameObject);
}
 
 
 
 
}