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AI is alerted immediately when a unit it knowsabout is killed
Closed, ResolvedPublic


If an AI unit knowsabout another AI unit (of the same side), it will know immediately when that unit is killed by an enemy even if it can't see or hear the unit or the enemy that killed it.

Video highlighting the issue: {F21719}


Legacy ID
AI Issues
Steps To Reproduce
  1. Add three enemy units in a column spaced ~30m apart, like so: <-A <-B <-C Where the arrow <- represents the direction the unit is facing.
  1. Move or teleport C next to A (or anywhere within max view distance).
  2. Kill B with a silent/suppressed weapon.

Expected: Neither A nor C should detect that B has been killed as there is no line of sight and they are beyond audible range for a supressed weapon.

Observed: C immediately detects that B has been killed. A remains oblivious.

Additional Information

Related Arma 2 issues from CIT:

AI aware of location of bomber after satchel charge detonated

AI knows about having done a kill instantly

Event Timeline

mrflay edited Steps To Reproduce. (Show Details)Aug 28 2013, 4:25 PM
mrflay edited Additional Information. (Show Details)
mrflay set Category to AI Issues.
mrflay set Reproducibility to Always.
mrflay set Severity to None.
mrflay set Resolution to Fixed.
mrflay set Legacy ID to 3735718581.May 7 2016, 4:19 PM
Bohemia added a subscriber: ceeeb.Aug 28 2013, 4:25 PM

Without a valid mission to reproduce this issue nothing can be done about it.

maturin added a subscriber: maturin.May 7 2016, 4:19 PM

Maybe people will post missions when the bugtracker allows attaching raw PBOs and SQMs. Making us compress 50kb into 35kb files is just silly.

Anyways, plenty of tickets have been accepted with just videos.


I suggest amending this ticket to "AI is alerted immediately when a friendly unit it knowsabout is killed."

Also, the expected behavior should be that the AI is alerted after a suitable delay.

mrflay added a subscriber: mrflay.May 7 2016, 4:19 PM

Mission repro added (rename to mission.sqm). Btw, it's on Stratis.

F2kSel added a subscriber: F2kSel.May 7 2016, 4:19 PM

I was just about to post the same, when doing a stealth mission it's really frustrating that the AI can detect a dead body they can't see.

I think you could have simply zipped up and attached the mission folder, makes it easier for everyone, no renaming, no map guessing. Just food for thought for next time.

I can confirm the issue; you can even accelerate the repro by teleporting the guard away, such as issuing:

guard setPosATL [2222.5,5601.81,0]

OMAC added a subscriber: OMAC.May 7 2016, 4:19 PM
OMAC added a comment.Nov 28 2013, 1:19 AM

This issue seems related to this Arma 2 CO issue:

Unknown Object (User) added a subscriber: Unknown Object (User).May 7 2016, 4:19 PM
Unknown Object (User) added a comment.Nov 28 2013, 4:17 AM

Please bear in mind a suppressed gun is not completelly silent.

But this is true, in case a squad wants to leave 70 meters between players in a low-visibility low-sound place to search for something and you take one of them down, the others have no way to see what happened, same if an unit over 400 meters away from their squad with no radio is engaged in a firefight

See also:

AI knows about having done a kill instantly

Added links to CIT in additional info. Thanks!

in progress

oukej added a subscriber: oukej.May 7 2016, 4:19 PM
oukej added a comment.Oct 15 2014, 4:13 PM

↑ and should now be fixed and significantly improved. :)

The units' checks are performed with a periodicity because of performance - please bear that in mind. (scenarios with 1 meter / 1 second detail in stealth riddles won't work - you still need to maintain some scale to suit the lod of the detection)

Please keep us informed if you encounter any emergent side-effects.

Yep, this no longer an issue (tested in 1.35.127767). Very nice! :)

Possible side effect?

0021220: AI is not alerted when unit on same side is killed with silent weapon

Mass-closing all resolved issues not updated in the last month.

Please PM me in BI Forums ( if you feel your bug was closed in error.