Dwarf Fortress Bug Tracker - Dwarf Fortress
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IDProjectCategoryView StatusDate SubmittedLast Update
0006068Dwarf FortressDwarf Mode -- Transport/Haulingpublic2012-07-03 12:502013-11-01 08:18
ReporterTrif 
Assigned To 
PrioritynormalSeverityminorReproducibilityalways
StatusnewResolutionopen 
PlatformPCOSWindows 7OS Version64 Bit
Product Version0.34.11 
Target VersionFixed in Version 
Summary0006068: Minecarts falling onto a floor injure creatures directly below the floor
DescriptionBasically, the creature under the tile on which the minecart lands behaves as if it had collided with the minecart - it gets propelled through the air, skids on the ground, the typical minecart injuries.
This only works with minecarts, other landing objects are harmless.
I also tried to apply Newton's cradle, i.e. a minecart landing on a minecart positioned on a floor over a creature - the creature remained unharmed.

I think the problem is that minecarts handle vertical collisions like horizontal collisions and fail to check if there is anything between the minecart and the creature.
Steps To ReproduceDig a shaft, 3 z-levels deep, one tile wide.
Build a floor in the middle and pasture an animal at the bottom like so.
__ __
  |_|
  |a|

Drop a minecart into the shaft. Even though it lands on the floor, the animal gets injured.
Additional InformationA save is available here: http://dffd.wimbli.com/file.php?id=6613 [^]
Tagscollision, minecart
Relationships
related to 0005996new  Minecarts can teleport through walls. 
related to 0010320new  Floor level is considered differently for standing and bouncing dwarfs. 
Attached Files
Issue History
Date ModifiedUsernameFieldChange
2012-07-03 12:50TrifNew Issue
2012-07-03 12:53TrifTag Attached: minecart
2012-07-03 12:53TrifTag Attached: collision
2012-07-03 18:49QuietustNote Added: 0023146
2012-07-06 04:19TrifNote Added: 0023169
2013-11-01 04:54KumquatNote Added: 0024190
2013-11-01 08:17FootkerchiefRelationship addedrelated to 0005996
2013-11-01 08:18FootkerchiefNote Added: 0024191
2017-11-05 12:32LociRelationship addedrelated to 0010320

Notes
(0023146)
Quietust   
2012-07-03 18:49   
See also: 0005996, 0005970
(0023169)
Trif   
2012-07-06 04:19   
I don't think those are related. This bug occurs with falls of any height - the minecart doesn't teleport through the floor, it just hits the creature through the floor.
(0024190)
Kumquat   
2013-11-01 04:54   
I just had a random stray dog killed by this. The dog was in a dining room. The minecart dropshaft ends with a ramp on the level above. The cart itself, full of ore and flux, made it successfully to its final stop.
(0024191)
Footkerchief   
2013-11-01 08:18   
There's at least a thematic relationship between this and 0005996, which is good enough for me.