unity3d添加武器功能

using UnityEngine;
using System.Collections;

public class TankWeapons : MonoBehaviour {

public GameObject shell;
public float shootPower;//确定子弹的发射力
public Transform shootPoint;//确定子弹的发射点。新建一个tank的空子物体，用来记录子弹的发射位置

void Update () {

if (Input.GetKeyDown (KeyCode.Space)) {//当按下空格时，调用Shoot()函数，所以用GetKeyDown

Shoot();

}

}

void Shoot(){

GameObject newShell = Instantiate (shell, shootPoint.position, shootPoint.rotation) as GameObject;//用Instantiate函数克隆一个Object，并将Object转化为GameObject，存于newShell
Rigidbody r = newShell.GetComponent<Rigidbody> ();//r定义为newShell的刚体
r.velocity = shootPoint.forward * shootPower;//定义r的速度的方向及大小，速度方向为shootPoint.forward，大小为shootPower

}

}