chameleon/Assets/Scripts/Helper/MouseSensitivity.cs

using UnityEngine;

/// Global mouse look-around sensitivity multiplier, shared by every camera
/// controller (FreeCam, FirstPerson, ThirdPersonOrbit). 1 = unchanged baseline.
/// Persisted per-machine via PlayerPrefs so the setting survives restarts.
public static class MouseSensitivity
{
    public const float Default = 1f;
    public const float Min = 0.1f;
    public const float Max = 4f;

    const string PrefKey = "Settings.MouseSensitivity";

    static bool _loaded;
    static float _multiplier = Default;

    public static float Multiplier
    {
        get
        {
            if (!_loaded)
            {
                _loaded = true;
                _multiplier = Mathf.Clamp(PlayerPrefs.GetFloat(PrefKey, Default), Min, Max);
            }
            return _multiplier;
        }
        set
        {
            float v = Mathf.Clamp(value, Min, Max);
            _loaded = true;
            if (Mathf.Approximately(v, _multiplier)) return;
            _multiplier = v;
            PlayerPrefs.SetFloat(PrefKey, v);
            // Flush to disk now so the setting survives a hard kill (build), not
            // only a clean quit. Settings changes are rare user actions, so the
            // extra write is negligible.
            PlayerPrefs.Save();
        }
    }
}