写代码之前，要先将地面设置静态，然后添加Navigation，进行烘焙场景，然后在玩家身上挂上

NavMeshAgent，就可以用代码控制玩家了

Animator an;
    NavMeshAgent age;
    public Transform cube;
    // Start is called before the first frame update
    void Start()
    {
        an = GetComponent<Animator>();
        age = GetComponent<NavMeshAgent>();
        //age.destination = cube.position;
    }

    // Update is called once per frame
    void Update()
    {
        if (Input.GetMouseButtonDown(0))
        {
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            RaycastHit hit;
            if (Physics.Raycast(ray, out hit))
            {
                age.SetDestination(hit.point);
                transform.LookAt(hit.point);
            }
        }
        
        if (age.remainingDistance<=1f)
        {
            an.SetFloat("run",0);
        }
        else
        {
            an.SetFloat("run",1);
        }
    }