unity用刚体做玩家移动和玩家看向鼠标点

 //人物移动的一些基础属性
    private float speed = 5;
    private float h, v;
    private Rigidbody rig;
    private Camera cam;
    private Animator anm;
    private bool isMove=false;
    // Use this for initialization
    void Start () {

        rig = gameObject.GetComponent<Rigidbody>();//寻找刚体组件
        cam = Camera.main; //设置主摄像机
        anm = gameObject.GetComponent<Animator>();//动画组件
    }
    
    // Update is called once per frame
    void Update () {
        //人物移动
        h = Input.GetAxisRaw("Horizontal"); //寻找对应的轴
        v = Input.GetAxisRaw("Vertical");
        Vector3 v3 = new Vector3(h, 0, v).normalized;
        rig.velocity = v3 * speed;//给刚体施加一个力。  因为是施加力的原因 所以要把旋转给锁定 防止 物体翻滚。
        rig.constraints = RigidbodyConstraints.FreezeRotationX | RigidbodyConstraints.FreezeRotationZ | RigidbodyConstraints.FreezeRotationY | RigidbodyConstraints.FreezePositionY;
        if (h == 0 && v == 0)
        {
            isMove = false;//这是动画系列 可以不用考虑  
            anm.SetBool("Move", false );
        }
        else
        {
            isMove = true;
            anm.SetBool("Move", true);
        }
        
        

        //人物朝向鼠标点击的方向
        Ray ray = cam.ScreenPointToRay(Input.mousePosition);
        RaycastHit hit;
        if (Physics.Raycast (ray ,out hit,1<<8))
        {
            Vector3 lookat = new Vector3(hit.point.x, transform.position.y, hit.point.z);
            lookat = lookat - transform.position;
           //旋转目标朝向
            transform.rotation = Quaternion.LookRotation(lookat);
        }