public void SetNeighbour(NeighbourDirection direction, TerrainTile tile)
{
Neighbours[(int)direction] = tile;
tile.Neighbours[(int)direction.Opposite()] = this;
}
public void SetNeighbour(NeighbourDirection direction, Node node)
{
Neighbours[(int)direction] = node;
node.Neighbours[(int)direction.Opposite()] = this;
}