Grids with different walkable directions

1

In the 2D and Turnbased examples, There are grid that walkable and obstacles that not. I am wonder if I can use not obstacles, but setting walkable direction in the grid?

maze
maze999×597 279 KB

2

You can set up Node links with oneway, though this can’t be automated. You either have to place these manually or write a script to place them for you.

If you’re using prefabs I suppose you could add one of these into your prefab to not have to worry about them :slight_smile:

3

That sounds complicated. Maybe I should use recastgraph if the map is very huge. Can I set the agent to only walk along the integer position on a recastgraph? Like a fade grid.

4

Using walls just to constrain the directions which are walkable is not possible at the moment without a custom script. You can write such a script relatively easily though.

Something like


public LayerMask layerMask = -1;
void Start () {
    // Update the graph when pathfinding has been paused
    AstarPath.active.AddWorkItem(() => {
        var gg = AstarPath.active.data.gridGraph;
        // Iterate through alll nodes
        gg.GetNodes(node => {
            // Iterate through all neighbors of the node
            for (int dir = 0; dir < 8; dir++) {
                var neighbor = node.GetNeighbourAlongDirection(dir);
                if (neighbor != null) {
                    // If there is an obstacle between them then disable the connection
                    if (Physics.Linecast((Vector3)node.position, (Vector3)neighbor.position, layerMask)) {
                        node.SetConnectionInternal(dir, false);
                    }
                }
            }
        });     
    });
}

Make sure that the ground is not included in the layer mask.