/// <summary>
/// Protected constructor
/// </summary>
/// <param name="mSceneMgr">A reference to the scene manager</param>
/// <param name="characterStat">A reference to a character stat</param>
protected HMD(SceneManager mSceneMgr, RenderWindow mWindow, CharacterStats characterStat)
{
this.mWindow = mWindow;
this.mSceneMgr = mSceneMgr;
this.characterStats = characterStat;
}