unity中自制模拟第一人称视角

public float sensitivityX = 5f;
public float sensitivityY = 5f;

public float sensitivetyKeyBoard = 0.1f;
public float sensitivetyMouseWheel = 10f;

private GameObject Playercamera;
public Rigidbody rigidbody;
public float speed = 5;

void Start()
{
　　Playercamera = GameObject.Find("PlayerCamera");
}

void Update()
{
　　//滚轮实现镜头缩进和拉远
　　if (Input.GetAxis("Mouse ScrollWheel") != 0)
　　{
　　　　Playercamera.GetComponent<Camera>().fieldOfView = Playercamera.GetComponent<Camera>().fieldOfView - Input.GetAxis("Mouse ScrollWheel") * sensitivetyMouseWheel;
　　}
　　//鼠标右键实现视角转动，类似第一人称视角  
　　if (Input.GetMouseButton(0))
　　{
　　　　float rotationX = Input.GetAxis("Mouse X") * sensitivityX;
　　　　transform.Rotate(0, rotationX, 0);

　　　　float rotationY = Input.GetAxis("Mouse Y") * sensitivityY;
　　　　Playercamera.transform.Rotate(-rotationY, 0, 0);
　　}

}
void FixedUpdate()
{
　　//控制移动
　　float h = Input.GetAxis("Horizontal");
　　float v = Input.GetAxis("Vertical");

　　//朝一个方向移动 new Vector3(h, 0, v) * speed * Time.deltaTime是个向量
　　transform.Translate(new Vector3(h, 0, v) * speed * Time.deltaTime);
　　//移动到一个位置
　　//rigidbody.MovePosition(transform.position + new Vector3(h, 0, v) * speed * Time.deltaTime);
}