Dwarf Fortress Bug Tracker - Dwarf Fortress
View Issue Details
0009056Dwarf FortressCave-inspublic2015-08-30 02:582016-07-13 20:12
vanatteveldt 
lethosor 
normalminorhave not tried
acknowledgedopen 
linuxubuntu15.04
0.40.24 
 
0009056: "invisible" twigs block cave-in
http://www.bay12forums.com/smf/index.php?topic=152824.0 [^]

I'm trying to cave-in a wall of natural rock into a cavern lake to dam it off. Three of the segments are blocked just above the water because they hit twigs and branches that are not even visible without using 'k'.

IMHO this is a bug because (1) twigs should not be able to support the weight of the world, and should act like floors, and (2) nothing that is not visible as an icon on the map should be able to support something.

http://i.imgur.com/trnO0wV.png [^] shows an example. The three tiles missing in the dam are supported by the fungiwood branches (shown with 'k') and 'invisible' fungiwood twigs to the left and right of the current cursor position.
No tags attached.
related to 0008716new  Walls with suspended construction get invisible after cave in 
child of 0007762new  Cave-in stopped by tree, results in floor tiles stuck in branches and a subsequent cave-in if tree is felled 
Issue History
2015-08-30 02:58vanatteveldtNew Issue
2015-08-31 14:36DetrosNote Added: 0033018
2015-09-02 10:41lethosorRelationship addedchild of 0008716
2015-09-02 10:41lethosorNote Added: 0033028
2015-09-02 10:41lethosorRelationship replacedrelated to 0008716
2015-09-02 10:42lethosorNote Edited: 0033028bug_revision_view_page.php?bugnote_id=0033028#r13291
2015-09-02 10:42lethosorAssigned To => lethosor
2015-09-02 10:42lethosorStatusnew => acknowledged
2015-09-03 15:44DetrosNote Added: 0033035
2016-07-13 20:12LociRelationship addedchild of 0007762
2017-06-08 20:13HuntthetrollIssue Monitored: Huntthetroll

Notes
(0033018)
Detros   
2015-08-31 14:36   
Can those twigs be invisible (=black tile unless selected) because there is cave-in dust on them, similar to 0008716?
(0033028)
lethosor   
2015-09-02 10:41   
(edited on: 2015-09-02 10:42)
Looks like that part's related to me. From what I remember, constructed floors don't survive cave-ins (although maybe that's only true of natural floors) - if that's the case, trees probably shouldn't either.

(0033035)
Detros   
2015-09-03 15:44   
I got really confused at first why should some part of something be related to you, lethosor. Then I read it for the tenth time and got it. :D

Building some 3x3 pillars (stairs in the mid, floors around) I have got a dwarf who flew through several floors before being stopped by a wall. IIRC other floor tiles that got impacted only by some cave-in dust survived the collapse.