Unity mouse controls the first person camera perspective

Implementation of first person camera ：

The horizontal distance when the mouse moves will determine the rotation angle of the camera in the horizontal direction , The axis of rotation should be In the world coordinate system y Axis

The distance in the vertical direction will make the camera rotate up and down , It should be around at this time In its own coordinate system x Axis rotate

Why not around the camera x Axis （transform.right）, Change the rotating shaft and run it for a while

public class FirstPersonalCamera : MonoBehaviour {
    public float speed = 5;
	// Update is called once per frame
	void Update () {
        // The horizontal distance the mouse moves in this frame 
        float x = Input.GetAxis("Mouse X");
        // Around in world coordinates y Shaft rotation 
        transform.Rotate(Vector3.up * x * speed, Space.World);
        // The vertical distance the mouse moves in this frame 
        float y = Input.GetAxis("Mouse Y");
        // Around their own x pivot 
        transform.Rotate(Vector3.right * -y * speed);
	}
}

 

  When the mouse clicks , Move the mouse to make the camera angle rotate around the protagonist

public class CameraView : MonoBehaviour {
    Transform Player;
    private float x, y;
    public float rotateSpeed=5;
	// Use this for initialization
	void Awake() {
        Player = GameObject.FindGameObjectWithTag("Player").transform;
        // The camera looks at the player 
        transform.LookAt(Player);
	}
	// Update is called once per frame
	void Update () {
        if (Input.GetMouseButton(1))
        {
            // The horizontal distance the mouse moves in this frame 
            x = Input.GetAxis("Mouse X");
            // Around the player's point , World y Shaft rotation 
            transform.RotateAround(Player.position, Vector3.up, x*rotateSpeed);
            // The vertical distance the mouse moves in this frame 
            y = Input.GetAxis("Mouse Y");
            // Around the player's point , Of the camera x Shaft rotation 
            transform.RotateAround(Player.position, transform.right, y * rotateSpeed);
        }
	}
}