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[KainInt]

So, I know that in a situation like this:

Code: [Select]

ooo
oao
booWhere o = walls, a creature could get from a to b.

But in a situation where level 1 is:

Code: [Select]

ooo
oao
oooAnd level 2 is

Code: [Select]

...
.o.
b..Where . is a floor, would a creature be able to go from a to b?

[Imp]

The only way to pass between z levels is to use a ramp or stairs, or to fly or fall.

Creatures never choose to fall, save for a few enthusiastic dodging miscalculations.

Creatures that cannot fly and are not forced to dodge will be unable to move between b and a as you have drawn them.

I recommend you consider making some 'areas' like this in your fortress, then test with your own dwarves where they can and cannot reach by creating jobs across possible barriers.  Wall construction is an especially nice way to test such things because if there is no access to where the wall is being made, then the game will tell you so immediately instead of your having to wait for a dwarf to cancel the job or simply never attempt to do it.

[rhesusmacabre]

The easiest way to test this sort of thing is to use the Arena. You can alter the configuration of the arena via "\data\init\arena.txt".

In your case, movement is not possible. In fact, it is not possible if there is just the one wall on z=1:

 z=1:   ...
        .a.
        o..

 z=2:    o    (extra wall for support)
         o
        b 

[Garath]

if they're walls, they include a floor at the top, so it would make a complete roof if you build anything in the middle higher up.

if you build fortifications and somehow build the blocking 'center' tile, flyers are able to cross.

F= fortification
W= wall
. = empty space

side view over two levels.

.W.
F.W

fortifications don't come with the floor over it. It'll block creatures walking past, but flyers can slip from the empty left tile over to the middle tile. Since a wall provides a more complete block and acts as a floor for the higher level, it is impossible to slip from the center tile to the one on the right

[robertheinrich]

It should be mentioned that if in your second case "a" has a ramp then a creature could move diagonally up to level 2 even if there is a wall directly above that ramp. I learned that the hard way when a titan came to visit my fort...