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[Riemann]

I've finally figured out what crafters do when choosing what materiel to work with. In a new fort that was almost covered in raw stone I noticed that my crafter was choosing stones that meet these criteria:
1) Closest in the X/Y axis
2) On the lowest possible Z axis value

So the crafter chose stones on the bottom floor (3 down from the workshop) directly under his feet. If they had been on the same Z level they would be the closest. As it is there is quite a walk between the two.

This seems similar to the behavior of miners who will prefer to dig out from the upper left to lower right on the lowest Z level possible.

[red glass]

I'm pretty sure it's strictly a distance formula (without respect to walls, floors, etc). So a stone 15 z-levels below the workshop won't get used if there's something just 10 squares to the left, but that 10 squares to the left won't get used if there's a stone 3 levels down and 4 squares over.

[Align]

Z level is completely ignored for distance calculations. If a dwarf is standing next to a rock and there's one on the same square as the dwarf except 15 levels down, he'll go for the latter stone.

[ December 07, 2007: Message edited by: Align ]

[Draco18s]

You can verify that the Z axis is ignored by building a crafts shop N levels down directly below your trade depot.  when you go to select goods to trade you'll notice that they are not at a distance of N but a distance of 0.

[Riemann]

You can verify this bug in a similar way. Build a craft shop with stone nearby, then tunnel out several levels directly below it. Notice that those stones (the ones at 0 x/y distance but Lots Z distance) will be chosen.

Also note that if several stones are tied for least x/y distance the one that is chosen is that with the lowest Z value.