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0002135Dwarf FortressPathfindingpublic2010-06-02 21:332010-06-13 11:33
resolvedno change required 
desktop PCWindows 7 64b.
0002135: Incomprehensible pathfinding error - no access to some tiles in an empty room
I got a fortress where, in a huge empty room, some tiles show 'no access' when trying to build a wall - when there is no visible reason to this. The room is empty of furniture or anything that could block the path, and the 'pattern' described by the inaccessible tiles looks just random.
i have no idea, but i can provide a savegame which has the bug.
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Issue History
2010-06-02 21:33BrzhkNew Issue
2010-06-03 00:54FootkerchiefNote Added: 0007591
2010-06-03 04:03Rafal99Note Added: 0007593
2010-06-03 04:11BrzhkNote Added: 0007596
2010-06-03 06:54BrzhkNote Added: 0007605
2010-06-03 09:09FootkerchiefNote Added: 0007609
2010-06-03 09:10FootkerchiefNote Edited: 0007609bug_revision_view_page.php?bugnote_id=0007609#r2825
2010-06-03 11:28BrzhkNote Added: 0007617
2010-06-10 00:46BrzhkNote Added: 0008029
2010-06-10 01:31mrdudeguyNote Added: 0008030
2010-06-13 11:29cephaloNote Added: 0008298
2010-06-13 11:33FootkerchiefNote Added: 0008301
2010-06-13 11:33FootkerchiefStatusnew => resolved
2010-06-13 11:33FootkerchiefResolutionopen => no change required
2010-06-13 11:33FootkerchiefAssigned To => Footkerchief

2010-06-03 00:54   
Is the room built into adamantine or the lowest cavern layer? Is it possible that you have hidden buildings that are preventing access?
2010-06-03 04:03   
Does it persist after save and load?

Can you reproduce it by placing a wall, then removing not-yet-built wall, then trying to build again in the same tile?

If answers are no and yes then it seems like reincarnation of pathfinding bug from 0.31.01 which was later fixed, at least for most people.
2010-06-03 04:11   
yes it does persist, and is true on ver. 31.03 & .04.

I cannot place a wall on thoses tiles as it states: no access.
2010-06-03 06:54   
nothing hidden (never tried using this feature), and no way it's on a cave layer or adamantine.
2010-06-03 09:09   
(edited on: 2010-06-03 09:10)
Did you ever place any buildings (e.g. workshops) in that room? It's possible you accidentally triggered the Hide designation or something. 'q' over the area to make sure.

If that doesn't explain it, you should definitely upload the save for this one. http://dffd.wimbli.com/ [^]

2010-06-03 11:28   
http://dffd.wimbli.com/file.php?id=2444 [^]
2010-06-10 00:46   
ok i might have a clue - i used (ok, abused) of dfhacks and liquids. I removed magma from that very floor. This might be problematic if it fails to remove the temperature as well, as i guess dwarves avoid going through scorching places...
2010-06-10 01:31   
thats probably it, liquids are one of the big complecations in path finding
2010-06-13 11:29   
I don't suppose there are constructed floors mixed in with the natural floors?
2010-06-13 11:33   
Most likely, removing the magma with DFHack just failed to trigger the necessary pathfinding updates. I'm going to close this report for now, since that's a pretty convincing explanation. If it shows up again without the use of DFHack, feel free to reopen the report.