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IDProjectCategoryView StatusDate SubmittedLast Update
0001932Dwarf FortressDwarf Mode -- Itemspublic2010-05-17 18:122014-08-09 13:26
Assigned ToFootkerchief 
PrioritynormalSeverityminorReproducibilityhave not tried
PlatformOSOS Version
Product Version0.31.03 
Target VersionFixed in Version 
Summary0001932: Ice over water cave-in produces blocks of rock and "Unknown"
DescriptionHad a wooden constructed wall built out over some water... the water froze, so I went to remove the wall while I could get at it. The wall came down really quick, and I went about my business. Spring time came, and the river thawed... but the areas that had wall over them still showed up as an ice floor... with water on the river floor beneath them. Floating ice? Maybe... but it wouldn't melt even as spring progressed. I went to channel the floors out, and they caved in, leaving a few blocks of dolomite rubble and two blocks of "Unknown". All blocks appeared as "open space" from above. After refreezing, I can dig into the dolomite. I can't do anything to the "Unknown".
Steps To ReproducePlay with ice?
Additional InformationI have a save for this, it's in 31.04 now; I don't know how to post saves for your viewing pleasure.
TagsNo tags attached.
Attached Files

- Relationships
related to 0001265new Ramps covered with ice have no floors above, adventurer can "fly" over 
has duplicate 0002106closedFootkerchief Unmeltable ice floors 
has duplicate 0004260resolvedFootkerchief Floor glitches occur when ice falls and melts in a cave-in 
has duplicate 0007889resolvedFootkerchief Ice-Drop, "Unknown" tile result 
has duplicate 0007923resolvedlethosor Muddy Unknown and Unknown Tiles 
related to 0001176new Ice Cave-ins for water in Glaciers producing odd results. 
related to 0004257resolvedFootkerchief Infinite Cave-In Loop makes a fortress unplayable, even on reclaim 
related to 0000682new Dropping large batch of ice into the stone layer (embarked on a glacier) didn't melt all the water at once. 
related to 0004684resolvedFootkerchief Bugged area appeared in cavern while playing. 
related to 0004941new Infinite Cave-In Loop in glacier 

-  Notes
Logical2u (manager)
2010-05-17 18:19

You haven't done any modding, have you? I encountered this back in 40d after attempting to mod out an aquifer using a tool.

You can upload saves using the Dwarf Fortress File Depot, [^] It might be helpful if you could also produce a save before the cave in, to show how the "unknown" rock was produced.
musicmastermsh (reporter)
2010-05-17 18:47 [^]

The pre-cavein state shouldn't be hard to recreate. Wooden wall over ice, let it thaw and refreeze, remove wall. When it thaws again, look for ice that remains.
Footkerchief (manager)
2010-05-17 20:50
edited on: 2010-06-19 12:17

An answer to Logical2u's question about modding would be helpful.

Anyway, this is probably related to one or more of the old bugs collected at 0001206:0003734, most likely these:

# 000885 □ [dwarf mode][jobs][constructions] ( [^]) placing a construction over an obsidian floor made on a lake and then removing it left a loam behind
# 000880 □ [dwarf mode][environment] ( [^]) after ice melted in a channel, the square became "muddy unknown"
# 000667 □ [dwarf mode][jobs][designations] ( [^]) caving in ice from a pool down one level resulted in open space over rock

musicmastermsh (reporter)
2010-05-17 21:13

Nothing significant or related, no.

Now that I think about it, the floating ice is just as strange as what happened to it after I mined it...
o_OWTFace (reporter)
2010-05-21 11:37

I can confirm this. Some combination of natural and constructed ice stairways in the middle of a frozen ocean collapsed when it thawed (which means one of those types didn't melt properly). One tile became a black square unknown tile just floating there. Sometime after that the game would crash when I looked in the glob section of stocks, but that could be related to "liquid [10]" sorts of bugs that I was also getting.
musicmastermsh (reporter)
2010-06-19 11:57

This is still happening in 31.05, I'll pick up 31.07 now that it's out and try it there.
hyndis (reporter)
2010-06-19 12:16

This may be an old bug. I've seen this happen even in 40D.

It involved carving ramps into a glacier and constructing things over the ramp. The square ended up turning black, just an empty void. Could never build anything there or do anything with that square ever again.
DDR (reporter)
2011-05-09 15:33

I just reproduced this bug, or something like it, in 31.25. In this case, I built a tower on ice during the winter. When summer came, and the ice melted, the tower hovered there until I loaded a save. Then, it came crashing down, and left some muddy unknown where the stairwell was. Construction materials: Stone near the bottom, ice near the top.

Footkerchief (manager)
2014-08-09 13:25

o0NoobHunter0o posted a save at 0007923: [^]

- Issue History
Date Modified Username Field Change
2010-05-17 18:12 musicmastermsh New Issue
2010-05-17 18:19 Logical2u Note Added: 0006908
2010-05-17 18:36 musicmastermsh Issue Monitored: musicmastermsh
2010-05-17 18:36 musicmastermsh Issue End Monitor: musicmastermsh
2010-05-17 18:47 musicmastermsh Note Added: 0006910
2010-05-17 20:50 Footkerchief Note Added: 0006921
2010-05-17 20:56 Footkerchief Note Edited: 0006921 View Revisions
2010-05-17 20:57 Footkerchief Note Edited: 0006921 View Revisions
2010-05-17 21:13 musicmastermsh Note Added: 0006922
2010-05-21 11:37 o_OWTFace Note Added: 0007134
2010-05-30 01:34 Footkerchief Relationship added has duplicate 0002106
2010-06-19 11:57 musicmastermsh Note Added: 0008688
2010-06-19 12:16 hyndis Note Added: 0008693
2010-06-19 12:17 Footkerchief Note Edited: 0006921 View Revisions
2011-03-21 06:51 Footkerchief Relationship added related to 0001265
2011-03-26 12:50 Footkerchief Relationship added has duplicate 0004260
2011-03-30 10:26 Footkerchief Relationship added related to 0001176
2011-03-30 10:38 Footkerchief Relationship added related to 0004257
2011-04-01 12:58 Footkerchief Relationship added related to 0000682
2011-05-09 15:33 DDR Note Added: 0017674
2011-07-10 12:24 Dwarfu Relationship added related to 0004684
2011-12-07 09:41 Footkerchief Relationship added related to 0004941
2014-08-07 04:49 lethosor Relationship added related to 0007889
2014-08-09 11:20 lethosor Relationship added parent of 0007923
2014-08-09 11:21 lethosor Relationship replaced related to 0007923
2014-08-09 13:25 Footkerchief Relationship replaced has duplicate 0007923
2014-08-09 13:25 Footkerchief Issue Monitored: o0NoobHunter0o
2014-08-09 13:25 Footkerchief Note Added: 0028675
2014-08-09 13:26 Footkerchief Assigned To => Footkerchief
2014-08-09 13:26 Footkerchief Status new => confirmed
2014-08-10 10:44 Footkerchief Relationship replaced has duplicate 0007889
2018-04-24 18:17 Huntthetroll Issue Monitored: Huntthetroll

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