Spawn unit in passable terrains

[hermestrismi]

In my campaigns, I use a lot of spawning events but I always have the problem of spawning units in closed unwalkable areas (like in a cave road surronded by walls )
I am sure there is a way to avoid that but I didnt found it.
Can someone help?

[gnombat]

passable=yes?

https://wiki.wesnoth.org/SingleUnitWML#Creation_Options

[Heindal]

There is one sloppy work around. You can also teleport the unit to the spot after spawning it, this will place it in the next possible spot.

[egallager]

One important thing to note here is that the name of the relevant key is different depending on whether you're placing the unit with SingleUnitWML or [unstore_unit]; it's passable=yes with the former, but find_vacant=yes with the latter. The validator will warn you if you mix the two up, if you're using that.

[Ravana]

Concern was about maps that have passable hex that is fully surrounded by impassable.

[beetlenaut]

I don't think you can avoid this, but you could redo the spawn if it's in a bad place. You can use [find_path] to find the distance to a known valid hex (like a village or the leader's position). If $path.hexes = 0, then no path could be found. Use a [while] loop to repeatedly spawn and kill the unit while a path is not found. Make sure you allow multi-turn paths, and cap the number of tries so you don't end up in an infinite loop. (Actually, WML loops aren't allowed to be infinite, but it can still take them a long time to exit.)