float moveHorizontal = Input.GetAxis ("Horizontal");float moveVertival = Input.GetAxis ("Vertical");
/*cam是摄像机的transfrom*/Vector3 camForward = Vector3.Scale(cam.forward, new Vector3(1, 0, 1)).normalized;Vector3 move = (moveVertival * camForward + moveHorizontal * cam.right);rb.AddForce (move * speed);