private void CreateCell(HexCell cell, int x, int z)
{
int ran = Random.Range(0, plainMat.Count);
Vector3 position;
position.x = (x + z * 0.5f - z / 2) * (HexMetrics.InnerRadius * 2);
position.y = 0;
position.z = z * (HexMetrics.OuterRadius * 1.5f);
cell.InitHexCell();
cell.GenerateMesh();
cell.transform.SetParent(transform, false);
cell.transform.localPosition = position;
cell.SetMaterial(plainMat[ran]);
//Debug.Log("cell created");
cell.coordinate = HexCoordinate.FromOffsetCoordinate(x, z);
cell.index = x + z * mapWidth;
hiddenCells.Add(cell);
}