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IDProjectCategoryView StatusDate SubmittedLast Update
0002135Dwarf FortressPathfindingpublic2010-06-02 21:332010-06-13 11:33
Assigned ToFootkerchief 
StatusresolvedResolutionno change required 
Platformdesktop PCOSWindows OS Version7 64b.
Product Version0.31.04 
Target VersionFixed in Version 
Summary0002135: Incomprehensible pathfinding error - no access to some tiles in an empty room
DescriptionI 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.
Steps To Reproducei have no idea, but i can provide a savegame which has the bug.
TagsNo tags attached.
Attached Files

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-  Notes
Footkerchief (manager)
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?
Rafal99 (reporter)
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.
Brzhk (reporter)
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.
Brzhk (reporter)
2010-06-03 06:54

nothing hidden (never tried using this feature), and no way it's on a cave layer or adamantine.
Footkerchief (manager)
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. [^]

Brzhk (reporter)
2010-06-03 11:28 [^]
Brzhk (reporter)
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...
mrdudeguy (reporter)
2010-06-10 01:31

thats probably it, liquids are one of the big complecations in path finding
cephalo (reporter)
2010-06-13 11:29

I don't suppose there are constructed floors mixed in with the natural floors?
Footkerchief (manager)
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.

- Issue History
Date Modified Username Field Change
2010-06-02 21:33 Brzhk New Issue
2010-06-03 00:54 Footkerchief Note Added: 0007591
2010-06-03 04:03 Rafal99 Note Added: 0007593
2010-06-03 04:11 Brzhk Note Added: 0007596
2010-06-03 06:54 Brzhk Note Added: 0007605
2010-06-03 09:09 Footkerchief Note Added: 0007609
2010-06-03 09:10 Footkerchief Note Edited: 0007609 View Revisions
2010-06-03 11:28 Brzhk Note Added: 0007617
2010-06-10 00:46 Brzhk Note Added: 0008029
2010-06-10 01:31 mrdudeguy Note Added: 0008030
2010-06-13 11:29 cephalo Note Added: 0008298
2010-06-13 11:33 Footkerchief Note Added: 0008301
2010-06-13 11:33 Footkerchief Status new => resolved
2010-06-13 11:33 Footkerchief Resolution open => no change required
2010-06-13 11:33 Footkerchief Assigned To => Footkerchief

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