Dwarf Fortress Bug Tracker - Dwarf Fortress
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0001547Dwarf FortressDwarf Mode -- Environmentpublic2010-04-26 05:402014-12-19 06:44
normalminorhave not tried
Windows XPSP3
0001547: Cave-ins can leave hanging down ramps in air
Collapsing a caved-out section of surface can leave the down-ramps corresponding to the up-ramps that are collapsed away, hanging in the air.
* Channel out top section to leave a few random ramps scattered (perhaps optional)
* Dig out area beneath these ramps
* Build a support in the dug area, link it to a lever
* Channel away remaining support around ceiling of dug out area
* Pull lever to cause cavein.
* Behold down ramps hanging in the air.
cave-in, leftover from 40d, ramps
has duplicate 0002530resolved Logical2u Cave-ins leave ramps 
has duplicate 0006917resolved Footkerchief Large cave-ins create "unusable downward slope" in open space tiles. 
related to 0007121confirmed Loci Cutting down mushroom trees leaves floating ramps of indeterminate material 
child of 0001295confirmed Footkerchief Channelling ledges can leave floating downward slopes 
Issue History
2010-04-26 05:40EricNew Issue
2010-04-26 05:40EricIssue Monitored: Eric
2010-04-26 07:27Logical2uNote Added: 0005115
2010-04-26 09:09FootkerchiefRelationship addedchild of 0001295
2010-04-26 09:12smjjamesNote Added: 0005130
2010-04-26 09:12smjjamesTag Attached: leftover from 40d
2010-04-26 09:12smjjamesTag Attached: cave-in
2010-04-26 09:12smjjamesTag Attached: ramps
2010-04-26 10:25FootkerchiefNote Added: 0005136
2010-04-26 10:25FootkerchiefNote Edited: 0005136bug_revision_view_page.php?bugnote_id=0005136#r1809
2010-07-01 17:23Logical2uRelationship addedhas duplicate 0002530
2012-03-14 09:03FootkerchiefSummaryCavins can leave hanging down ramps in air => Cave-ins can leave hanging down ramps in air
2012-03-15 00:53GreendogoIssue Monitored: Greendogo
2014-07-09 23:40FootkerchiefRelationship addedhas duplicate 0006917
2014-11-22 07:44ptb_ptbNote Added: 0031120
2014-11-22 12:36ptb_ptbNote Edited: 0031120bug_revision_view_page.php?bugnote_id=0031120#r12390
2014-11-22 12:38ptb_ptbNote Edited: 0031120bug_revision_view_page.php?bugnote_id=0031120#r12391
2014-11-24 07:04FootkerchiefRelationship addedrelated to 0007121
2014-11-25 13:03ptb_ptbNote Added: 0031170
2014-12-16 08:38ptb_ptbNote Added: 0031341
2014-12-16 09:12ptb_ptbNote Edited: 0031341bug_revision_view_page.php?bugnote_id=0031341#r12522
2014-12-17 04:01ptb_ptbNote Edited: 0031341bug_revision_view_page.php?bugnote_id=0031341#r12531
2014-12-19 06:44FootkerchiefAssigned To => Footkerchief
2014-12-19 06:44FootkerchiefStatusnew => confirmed
2017-06-08 18:33HuntthetrollIssue Monitored: Huntthetroll

2010-04-26 07:27   
Related to 0001295
2010-04-26 09:12   
Not to mention its a leftover bug from 40D.
2010-04-26 10:25   

# 000472 □ [dwarf mode][constructions] collapsing a building/terrain can leave a line of floating downward ramp symbols

2014-11-22 07:44   
(edited on: 2014-11-22 12:38)
Also, if you have a pond with sloping edges before the collapse, the pond will have 'sharp' edges (no ramps) after the collapse.

[EDIT] Oh, and it appears that they can spontaneously 'cave in' long after they are first formed. Possibly when a flying creature passes through one of their tiles? It is obviously hard to confirm this, but there was a swan in the general area when a cave in triggered on the surface and there is one less floating 'down ramp'.

[EDITx2] Yep, another just collapsed and there is swan blood at the scene and an injured swan nearby seems pretty clear.

2014-11-25 13:03   
Here's a new one. It appears possible that saplings can grow on the floating down-ramps because I have a tree that starts in mid-air.
2014-12-16 08:38   
(edited on: 2014-12-17 04:01)
Still present in DF 0.40.19

Note that the visible floating down-ramps can be removed by building a floor over them then removing the floor. I don't yet know if that completely removes all traces of them.

Levitating tree save:
http://dffd.wimbli.com/file.php?id=10257 [^]

The squares where levitating trees grow will continue to grow trees over time if the first is cut down.