// Use this for initialization
    void Awake()
    {
        //set game manager's editor level
        GameManager.Instance.EditorController = this;
        GameManager.Instance.IsLevelEditor    = true;

        //create main grid
        grid = new CustomGrid();
        grid.Initialize(GetComponent <LineRenderer>());

        //create previous and next grids
        previousGrid = new CustomGrid();
        nextGrid     = new CustomGrid();
    }