campfire/Assets/Scripts/CameraController.cs

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

public class CameraController : MonoBehaviour {
    public GameState GameState;
    public Options Options;
    public Transform BodyTransform;
    public Transform HeadTransform;

    private PauseMenu Menu;

    private void Awake() {
        Menu = GameObject.FindGameObjectWithTag("Pause Menu").GetComponent<PauseMenu>();
    }

    private void Update() {
        if (GameState.Current == State.Playing) {
            Cursor.visible = false;
            Cursor.lockState = CursorLockMode.Locked;

            Vector3 Eulers = BodyTransform.localEulerAngles;
            Eulers.y += GetHorizontalLookDelta() * Options.MouseSensitivity * (Options.InvertMouseX ? -1 : 1);
            BodyTransform.localEulerAngles = Eulers;

            Eulers = HeadTransform.localEulerAngles;
            Eulers.x -= GetVerticalLookDelta() * Options.MouseSensitivity * (Options.InvertMouseY ? -1 : 1);
            if (Eulers.x > 90 && Eulers.x < 180) {
                Eulers.x = 90;
            }
            if (Eulers.x < 270 && Eulers.x > 180) {
                Eulers.x = 270;
            }
            HeadTransform.localEulerAngles = Eulers;
        } else {
            Cursor.visible = true;
            Cursor.lockState = CursorLockMode.None;
        }
    }

    private float GetHorizontalLookDelta() {
        return Input.GetAxis("Mouse X");
    }

    private float GetVerticalLookDelta() {
        return Input.GetAxis("Mouse Y");
    }
}