unity3初学往鼠标点击的方向发射子弹

    //声明发射点

public Transform firepoint;

//声明子弹实例

public Rigidbody bullet;

//初始化发射时间

private float nextFire = 1F;

//声明子弹间隔

public float fireRate = 2F; 

void Update () {

//点击左键并且时间已经大于间隔时间

if(Input.GetMouseButton(0)&&Time.time > nextFire){

//更新间隔时间

nextFire = Time.time + fireRate;

//通过射线获得目标点

Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);

Vector3 target = ray.GetPoint(10);

firepoint.LookAt(target);

//实例化子弹

Rigidbody clone;

clone =(Rigidbody)Instantiate(bullet,firepoint.position,firepoint.rotation);

//初始化子弹的方向速度

clone.velocity = target-firepoint.position;

   

}