private void Awake()
 {
     if (instance != null)
     {
         Debug.LogError($"Cannot have more than one instance of {nameof(CardboardSession)} in the scene!");
         Destroy(this);
     }
     else
     {
         instance = this;
     }
 }
 private void OpenCardboardView()
 {
     CardboardSession.EnableCardboardView();
 }
 private void CloseCardboardView()
 {
     CardboardSession.DisableCardboardView();
 }
 private void ScanQRCode()
 {
     CardboardSession.StartScanQRCode();
     SetEnableQROverlay(true);
 }