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[Nagidal]

At doors and floor hatches you can forbid passage. I would like another possibility that you select the directions in which they are passable, but forbid the other. For example in an ambush or siege I have certain areas which I would like to evacuate (let my dwarves in a safe burrow) but don't let anybody out to the danger.

[forsaken1111]

This would be nice as a traffic control option as well. Designate certain areas one-way corridors or whatever.

[TheyTarget]

Maybe not make doors one way, but being able to build a special door thats one way could work. I would agree this would be nice.

[Silverionmox]

Good idea, but it runs into fundamental problems with how pathfinding is organized. It uses connectivity areas, areas in which any tile is reachable from any other tile in the area. One-way areas don't really jive with that, and would thus require a rewrite of the entire pathfinding.

[Fishbreath]

It's possible to cheat and build a one-way gate in 40d: http://df.magmawiki.com/index.php/40d:One-way

I don't know if it's been tested in 31.xx, and the article does note that it's probably bad for pathfinding, but there you are.

[Draco18s]

It's possible to cheat and build a one-way gate in 40d: http://df.magmawiki.com/index.php/40d:One-way

I don't know if it's been tested in 31.xx, and the article does note that it's probably bad for pathfinding, but there you are.

I haven't messed with it as extensively in the newer versions as I (inadvertently*) did in 40d, but dwarves DO traverse it in both directions, but only if there is no other path, which due to the way A* (and similar) functions work, takes up a huge search-space.

The only way to have proper one-way doors would be to turn the connectivity map (which is the shortcut for determining that no path exists without ever calling A*) into a node graph itself.

*I built one during a megaproject on purpose and only managed to observe the effects in detail, as it was a living fort, not a test bed.

[Hyndis]

It's possible to cheat and build a one-way gate in 40d: http://df.magmawiki.com/index.php/40d:One-way

I don't know if it's been tested in 31.xx, and the article does note that it's probably bad for pathfinding, but there you are.

No longer works in 31.XX.

[Draco18s]

It's possible to cheat and build a one-way gate in 40d: http://df.magmawiki.com/index.php/40d:One-way

I don't know if it's been tested in 31.xx, and the article does note that it's probably bad for pathfinding, but there you are.

No longer works in 31.XX.

Just verified this.  Removing the floor leaves a down ramp.

[thijser]

Actually there are still one way roads. In order to get them you need to mess around with diging in ice/ice freezing over ramps. The game sometimes messes up creating one way paths. However this mainly leads to a lot of complaining from your dwarfs that they can't find a path ext.