炮塔发射子弹

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class BuffShoot : MonoBehaviour {
    public GameObject Bu;//发射的子弹
    public Transform tr;//发射子弹的位置
    float t;
    GameObject obj;
    // Use this for initialization
    void Start () {
        
    }
    
    // Update is called once per frame
    void Update () {
        t += Time.deltaTime;
        if (t>0.2f)
        {
            obj=  Instantiate(Bu,tr.position,tr.rotation);
            obj.AddComponent<Rigidbody>().useGravity = false;//不使用重力
            obj.GetComponent<Rigidbody>().AddForce(tr.transform.forward*1000);
            Destroy(obj,3);
            t = 0;
        }
        //if (obj)
        //{
        //obj.transform.Translate(tr.forward);

        //}

        transform.Rotate(0,1,0);//自动旋转
        
    }
}