Vector3 *2 ，ToString()自动四舍五入

还以为出错了，仔细看发现ToString()自动四舍五入

Vector3 forward = Camera.main.transform.forward;

Debug.Log("forward:" + forward.x.ToString() + "," +
                                   forward.y.ToString() + "," +
                                   forward.z.ToString() +

" forward * 2:" + (forward * 2).x.ToString() + "," +
                                       (forward * 2).y.ToString() + "," +
                                       (forward * 2).z.ToString()
                     );

gameObject.transform.position = Camera.main.transform.position +
                forward * 2;