Triggers firing twice in one activation, only in multiplayer

[Rebitaay 13]

Hi all,

 

Currently working on my second mission, and the multiplayer aspects of things are giving me a headache. I've crushed many bugs, but one that I can't seem to figure out is that many of my triggers are firing twice for one activation. This only happens in multiplayer with another player connected. For example: I have a trigger that detects when there are no OPFOR left, then spawns more. Occasionally, this ends up spawning 2x enemies or even 3x, rarely. Another example is I have a script that detects when there is no plane in a hangar and spawns a new plane, and it occasionally spawns two at once and everything goes to shit. 

 

I can upload the mission file if necessary. Any help would be greatly appreciated.

[Mokka 29]

This sounds like a locality issue. Make sure that unit spawning is limited to the server-side only.

Limit script execution in MP using (eg) these commands, pretty self-explanatory:

• isServer
• isDedicated
• hasInterface

Killzone_Kid has given a great explanatory sketch on how these work and what they mean:

if (isDedicated) then {
	//run on dedicated server only
};

if (isServer) then {
	//run on dedicated server or player host
};

if (hasInterface) then {
	//run on all player clients incl. player host
};

if (!isDedicated) then {
	//run on all player clients incl. player host and headless clients
};

if (!isServer) then {
	//run on all player clients incl. headless clients but not player host
};

if (!hasInterface) then {
	//run on headless clients and dedicated server
};

if (!hasInterface && !isDedicated) then {
	//run on headless clients only
};

 

Found some more resources:

• https://community.bistudio.com/wiki/Locality_in_Multiplayer
• http://killzonekid.com/arma-scripting-tutorials-locality/

 

Edited May 23, 2017 by Mokka
Added a few more references

[Rebitaay 13]

@Mokka Great info, I'll give some of these a try and report back once I've tested it with a buddy. Thanks!

[Mokka 29]

In case you were wondering, you can join "yourself" twice. See below post for reference:

 

[Mokka 29]

Oh, wait. That's you, isn't it.........

[Rebitaay 13]

1 minute ago, Mokka said:

Oh, wait. That's you, isn't it.........

Haha! I'm going to set that up eventually.

[Midnighters 152]

are you placing the trigger in the editor or is it scripted? 

[pierremgi 4898]

You just have to run on server only (as far as you spawn units/vehicles and you don't have any headless client). So check that in a trigger edited or add if (isServer) then { your trigger here } in a script.

[Rebitaay 13]

@Mokka

Forgot to report back, whoops! Just wanted you to know that you're a beautiful bastard. The info you gave me made everything magically work.

[Mokka 29]

Don't thank me, thank the wonderful guys (and maybe gals) that keep the BIKI and surrounding resources alive and healthy.

I am just showing you the way, those people made it :)

[sarogahtyp 1108]

The core information in this thread is that triggers are propagated through the network and fire on any connected machine. Therefore u have to handle it with things like isServer or isDedicated or hasInterface.

sent from mobile using Tapatalk

[crewt 31]

Additionally there should be an additional option in triggers that limit execution on server side only