Unity3D 射线法获取被点击对象的名称

void Update()
    {
        if (Input.GetMouseButton(0))
        {
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            RaycastHit hitInfo;

            if(Physics.Raycast(ray,out hitInfo))
            {
                GameObject gameObj = hitInfo.collider.gameObject;
                txt.text = gameObj.name;
            }
        }
    }