尝试移动脚本

简单的上下左右移动

    public int moveSpeed = 10;
    void Start()
    {
        // _rig = gameObject.GetComponent<Rigidbody>();
    }

    // Update is called once per frame
    void Update()
    {
        //Move();
        float horizontal = Input.GetAxis("Horizontal"); //A D 左右
        float vertical = Input.GetAxis("Vertical"); //W S 上 下

        //_rig.transform.Translate(Vector3.forward * vertical * moveSpeed);
        transform.position += Vector3.forward * vertical * moveSpeed * Time.deltaTime;
        transform.position += Vector3.right * horizontal * moveSpeed * Time.deltaTime;
        //_rig.MovePosition(transform.position);
        //_rig.MovePosition(transform.position + Vector3.forward * vertical * moveSpeed * Time.deltaTime);
        //_rig.MovePosition(transform.position + Vector3.right * horizontal * moveSpeed * Time.deltaTime);
        
        
    }

跟随摄像机视角移动

上述移动方式有个问题，在摄像机方向移动的时候，角色“向前移动”还是原来的方向，而不是当前视角的正前方，以下脚本解决这个问题。

角色向前移动朝着摄像机的正前方移动。

    public int moveSpeed = 10;
    public Camera CubeCamera;

    Vector3 _moveVec;

    // Start is called before the first frame update
    void Start()
    {

    }

    // Update is called once per frame
    void Update()
    {
        //Move();
        float h = Input.GetAxis("Horizontal"); //A D 左右
        float v = Input.GetAxis("Vertical"); //W S 上 下

        if(h!=0 || v != 0)
        {
            _moveVec = new Vector3(h, 0, v);
            _moveVec = Quaternion.Euler(new Vector3(0, CubeCamera.transform.eulerAngles.y, 0)) * _moveVec;
            transform.position += _moveVec * moveSpeed * Time.deltaTime;
        }
        
        // 角色角度移动
        transform.eulerAngles = new Vector3(0, CubeCamera.transform.eulerAngles.y, 0);

    }

Quaternion 通过旋转控制移动，参考：

https://blog.csdn.net/Vincenths/article/details/8682982

https://www.cnblogs.com/jeason1997/p/9822353.html

Quaternion * Vector3，可以理解成：在世界坐标系下旋转Quaternion，再乘以当前坐标系的Vector3向量，返回一个世界坐标系的向量。

2D移动脚本

    public float MoveSpeed;

    Vector3 _moveVec;

    void Start()
    {
        MoveSpeed = 2;
        _moveVec = transform.position;
    }

    void Update()
    {
        move();
    }

    void move()
    {
        float h = Input.GetAxis("Horizontal");
        float v = Input.GetAxis("Vertical");

        if(h!=0 || v != 0)
        {
            _moveVec.Set(h, v, 0);
            transform.position += _moveVec * MoveSpeed * Time.deltaTime;
        }
    }