private GrandpaDetection()
    {
        if (_instance != null)
        {
            return;
        }

        _instance   = this;
        isDetecting = true;
        items       = new List <Item>();
        freePlanes  = new List <GameObject>();
    }
 // Use this for initialization
 void Awake()
 {
     detection = GrandpaDetection.Instance;
     Debug.Log(detection);
     Debug.Log("planedetection awake");
 }