/* Fill each vertex of the grid with a GameObject. */
    private void SpawnVerticies(GameObject grid2D)
    {
        int boardDimensions = vertices.Length;

        for (int i = 0; i < boardDimensions; i++)
        {
            GameObject            vObj = new GameObject("vertex " + i);
            Grid2DVertexComponent vRef = vObj.AddComponent <Grid2DVertexComponent> ( );

            if (areVertexInteractable)
            {
                vObj.gameObject.AddComponent <BoxCollider2D> ( );
            }

            vObj.transform.SetParent(grid2D.transform);
            vObj.transform.position = vertices[i];
            vObj.transform.rotation = Quaternion.identity;

            vRef.InitOnStart( );

            vertexTable.Add(vertices[i], vObj);
        }
    }