unity3d 增加子弹碰撞后物体的爆炸力

using UnityEngine;

public class Bullet : MonoBehaviour {

public GameObject bulletEffecte;
// Use this for initialization
void Start () {

}

// Update is called once per frame
void Update () {
Destroy(gameObject,3f);
}
void OnCollisionEnter(Collision e)
{
Instantiate(bulletEffecte,transform.position,transform.rotation);
Destroy(gameObject);

if(e.gameObject.tag =="Cube")  //如果目标的标签是cube
{
//将球形的(OverlapSphere)的物理引擎(Physics) 放在一个碰撞体的数组里
Collider[] collider = Physics.OverlapSphere(transform.position,2);
//便利这个数组
foreach (Collider c in collider)
{
Rigidbody r = c.GetComponent<Rigidbody>(); //获得这个数组里的元素的刚体
if(r != null)    //如果刚体不是空的
{
r.AddExplosionForce(1000, transform.position, 3);//增加爆炸力(AddExplosionForce) (爆炸的力,爆炸点,爆炸范围)
}
}

}
}
}