SmoothMouseLook.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;


[AddComponentMenu("MouseLook ")]
public class SmoothMouseLook : MonoBehaviour
{
    // The speed at which we turn (Mouse Sensitivity)
    // mouseSensitivity.x is for left <-> right 
    // mouseSensitivity.y is for   up <-> down
    [Tooltip("How fast to turn when moving the mouse (bigger=faster, X: left<->right, Y: up<->down).")]
    [SerializeField] Vector2 mouseSensitivity = new Vector2(70f, 60f);

    // How much smoothing goes on for each axis
    [Tooltip("How smooth/mushy the mouse movement becomes (bigger=smoother, X: left<->right, Y: up<->down).")]
    [SerializeField] Vector2 smoothing = new Vector2(2f, 2f);

    // How far up the head can tilt, measured in angles from the horizon
    // Must be bigger than headLowerAngleLimit
    [Tooltip("How many degrees the head can look up at max.")]
    [SerializeField] float headUpperAngleLimit = 85f;

    // How far down the head can tilt, measured in angles from the horizon
    // Must be smaller than headUpperAngleLimit
    [Tooltip("How many degrees the head can look down at max.")]
    [SerializeField] float headLowerAngleLimit = -80f;

    // Invert the Y Axis of the Mouse if true
    [Tooltip("Invert Mouse Control for up<->down.")]
    [SerializeField] bool InvertAxisY = true;

    // Our current rotation from start in degrees
    float yaw = 0f;
    float pitch = 0f;

    // Stores the orientations of the head and body when the game started
    // We'll derive new orientations by combining these with the variables yaw 
    // and pitch
    Quaternion bodyStartOrientation;
    Quaternion headStartOrientation;

    // A reference to the head object (the object that will rotate up and down)
    // The body is the current (this) object, so there is no variable needed.
    // We don't want to expose this to the interface. Instead we just look for a
    // Child object with type Camera, when the game starts.
    Transform head;

    // Two 2D-Vectors that store both axis of the mouse
    private Vector2 smoothedMouseDelta;



    // Start is called before the first frame update
    void Start()
    {
        // Find the head – this returns the transform parameter of this objects 
        // first Child of type Camera. If none is found head = null 
        head = GetComponentInChildren<Camera>().transform;

        // Cache the orientation of body and head. This errors if head was not 
        // found
        bodyStartOrientation = transform.localRotation;
        headStartOrientation = head.transform.localRotation;

        // Lock and hide the cursor
        Cursor.lockState = CursorLockMode.Locked;
        Cursor.visible = false;
    }