public IEnumerable <SpaceTimeNode> GetNeighbours(SpaceTimeNode node)
{
foreach (var n in Graph.AdjacentVertices(Graph.GetTileAtPos(node.X, node.Y)))
{
yield return(new SpaceTimeNode(n.X, n.Y, node.T + 1));
}
yield return(node.Next());
}
public AbstractTile GetTile(SpaceTimeNode node) => Graph.GetTileAtPos(node.X, node.Y);