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AI outside the building far away can "hear" I kill the one of the other group of theirs?
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In the building set a man with a P07 9MM suppressed pistol and an opfor man in front of him and back to him. Outside the building I set a group about 70m away from it, and I am one of the group. Then start the demo. My team leader hears the gun fire and assign me a virtual target. In this demo I think the weapon with suppressor is totally failed and the most important issue is -- the building cant block the sound! This is too bad.

The second test. If I am the bluefor, then start the demo. If I kill the enemy with one shot, the enemies outside won't change any condition, even if I continue to shoot the window to make more noise, even if I move the enemy group from 70m to 10m in the editor. If I kill the enemy with more than one shot (e.g I shot his shoulder or leg then his head etc.) then I make the enemies outside alert even they are 70m far away!
So the second test really shows some ridiculous thing about AI ISSUE. So I change the Issue category. I really hope you can discuss it again. {F22210}


Legacy ID
AI Issues
Steps To Reproduce

play the demo and see what will happen.

Test 2: play as the bluefor and try to
a. kill the enemy by one shot then hit the windows of the building;
b. kill the enemy by 2+ shot
then open the door to see what the condition of enemy group outside.
You can also move the enemy group from 70m to 10m in the editor to do Test 2.

Additional Information

there seem to be something silent or spiritual communication between two friendly AI group at a certain distance. when one group is under attack but not deathful it can delivery a signal to other group unless it was destroy by one hit. the other group can receive the signal but they won't earn the exact position of enemy.
So there has nothing to do with sound. It is an AI superpower that make the enemy group know my assassination in the building.

Event Timeline

msy edited Steps To Reproduce. (Show Details)Sep 20 2013, 5:57 AM
msy edited Additional Information. (Show Details)
msy set Category to AI Issues.
msy set Reproducibility to Always.
msy set Severity to None.
msy set Resolution to Open.
msy set Legacy ID to 1526795713.May 7 2016, 4:50 PM
Bohemia added a subscriber: AD2001.Sep 20 2013, 5:57 AM

Supressors and silencers are two different things. They do not make any gun quite, in fact they are used to keep the sound of the gun firing from damaging your ears by bringing it down to a safe level.

msy added a subscriber: msy.May 7 2016, 4:50 PM
msy added a comment.Sep 20 2013, 7:08 AM

Supressors and silencers are two different things. They do not make any gun quite, in fact they are used to keep the sound of the gun firing from damaging your ears by bringing it down to a safe level.

Please, if 70 meters to a pistol with suppressor is a safe distance or not? Besides I set them in the building!

Kirill added a subscriber: Kirill.May 7 2016, 4:50 PM

You will hear a mechanical shutter sound even at a distance of 70m.

A suppressed 9mm is pretty loud. 125-130dB(A) is not what you'd call hearing safe (the definition makes you believe you can listen to suppressed shots without damage, which is wrong). You'd hear the shot in and around a building that is not soundproof. And there are no such buildings or bunkers in ArmA 3.

msy added a comment.Sep 21 2013, 6:14 AM

I don't know where you get the info but I, I don't believe it. DO you know how can describe 130db? If a working jet engine has a noise of 120db, then a pistol with suppressor has a noise as 10 times as jet engine?

I get the info directly from the source: the gun. I work in the firearms industry. But even as an "outsider" you'll find a lot of sources for sound levels for suppressed weapons. For example, here is a review for several 9mm suppressors.

You could also look up suppressor manufacturers and use their "values" which are mostly enthusiastic than realistic.

mrflay added a subscriber: mrflay.May 7 2016, 4:50 PM

Enemies can only hear suppressed weapons at those distances when the shots actually hits a soldier. If the shots don't connect, the enemy will not hear anything.

That does not make any sense, does it?

Selective hearing. "Oh, someone shot a weapon. It didn't hit anybody, so I just ignore the enemy presecne."

msy added a comment.Sep 22 2013, 1:11 PM

Good reply! I like it! It should be the origin issue not the sound aware the AI, but the dead body! If this proves right, then the AI has a magic X-RAY vision that cause problem anywhere.

You guys don't want ArmA3, you guys want a different game. Suppressors do not magically make enemies unaware of your position, even when you shoot them.

Of course the AI should also react to dead bodies, but this is another issue not only related to suppressed kills, which are not silent at all. You'd have to use a knife and some technique to stay covert. Or dedicated suppressed caliber & weapons, like .300AAC.

p00d73 added a subscriber: p00d73.May 7 2016, 4:50 PM

@mrflay: that's complete and utter bullshit. Sound waves are longitudinal waves of compressed air, meaning that unlike a laser, they'll reproduce spherically.

ThePredator is very right in almost anything he says. I do think suppressors are implemented horribly in ArmA 3 however. No subsonic ammunition and somehow the round magically becomes less potent with a suppressor. This is a major step backwards from ArmA 2 and one of the many areas where the developers completely f'ed up.

Yes, I know suppressors are not silencers. But even if you do make an actual silencer (or a completely silent weapon, eg. knife, bow, magic, whatever), the enemy will still know when his buddies are killed. It's how arma work, currently.

msy added a comment.Sep 23 2013, 2:49 PM

One thing I really ignored that if I was the bluefor man, and I delet the opfor in the building, then I shoot the glasses of the building, the enemies outside never change any condition! So how do you explain? Why when there is no opfor in the building, the sound of breaking glassed by a same suppressor pistol won't make enemies outside alert?

msy added a comment.Sep 23 2013, 3:21 PM

You inspired me. Now I confirm it is not sound that cause the enemy group know the assasination in the building. If I am the bluefor and I kill the enemy one shot, then even I break every window of the building, the enemy wont change their safe condition. However if I kill the man by 2+ shots then they will change.