判断物体是否在摄像机内

    void Start(){
        Rect screenRect  = new Rect(0, 0, Screen.width, Screen.Height);
    }

    void Update{
        Vector3 screenPos = targetCamera.WorldToScreenPoint(objTrans.position);
        if(!screenRect.Contains(screenPos)){
            //do what you want
            Debug.log("Obj has gone out of screen...");
        }
    }