void Start()
{
// manager
trackingManager = GetComponent <TrackingManager>();
drawingManager = GetComponent <DrawingManager>();
uiManager = GetComponent <UIManager>();
// setup manager
trackingManager.DoStart(this);
drawingManager.DoStart(oDrawingPath);
uiManager.DoStart(this, oDrawingPath, GameObject.FindGameObjectWithTag("DefaultCursor"));
subMenuScrollController.DoStart(this, 1, 1);
// reset mode
ChangeMode(ModeStatus.Drawing);
// reset sub menu
// fps
StartCoroutine(CalculateFps());
}