【unity3d学习笔记】RPG 中控制相机距离拉近拉远以及旋转相机视角

附加于相机上的代码：

    private Transform player;  //跟随目标    Vector3 tempPosition=Vector3.zero;    Vector3 offsetPosition;    //相机距离目标之间的差向量    float distance = 0.0f;    public float speed = 1;    public float rotateSpeed = 4;    // Use this for initialization    void Start () {        player = GameObject.FindGameObjectWithTag(tags.player).transform;        transform.LookAt(player.position);        //计算差向量        offsetPosition = transform.position - player.position;    }    // Update is called once per frame    void Update () {        //控制相机跟随目标        transform.position = offsetPosition + player.position;        Rotate();        Distance();    }    //控制相机的拉近及拉远    void Distance()    {        distance = offsetPosition.magnitude;        //滚轮控制相机距离目标的距离        distance = distance + Input.GetAxis("Mouse ScrollWheel") * speed;        //控制最小与最大距离        distance = Mathf.Clamp(distance, 5, 20);        offsetPosition = offsetPosition.normalized * distance;    }    //控制相机围绕目标旋转    void Rotate()    {        if(Input.GetMouseButton(0))        {            Vector3 tempPos = transform.position;            Quaternion tempRot = transform.rotation;            transform.RotateAround(player.position, player.up, rotateSpeed * Input.GetAxis("Mouse X"));//**注意这里围绕旋转的轴是相机本身的x轴，类似天体运动中的自转**            transform.RotateAround(player.position, transform.right, rotateSpeed * Input.GetAxis("Mouse Y"));            float x = transform.eulerAngles.x;//限制旋转角度在10 - 80 之间            if(x<10||x>80)            {                transform.position = tempPos;                transform.rotation = tempRot;            }        }//注意一定要在旋转后更新差向量        offsetPosition = transform.position - player.position;    }