public void BackToStart()
{
//Debug.Log(123);
StartUI.SetActive(true);
_ImageTargetBehaviour.CloseAR();
_GameData.CloseAR();
Camera ARCameraGam2 = GameObject.Find("camera background").GetComponent <Camera>();
ARCameraGam2.enabled = false;
ARCameraGam.enabled = true;
_GameData.gameState = GameData.GameState.none;
_BookData.bookState = BookData.BookState.none;
}