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Multiplayer Vehicle desynchronization/floating/flying
Closed, ResolvedPublic

Description

If a local object of an affected class is existing for vehicle passengers desync happens for passengers.

I confirmed, that "Land_CashDesk_F" , "Land_InfoStand_V2_F" and many more are affected.

"Land_Device_assembled_F" is not affected.

Mission:
https://paste.sobonet.eu/vehLocalBug.VR.pbo

VIdeo of example mission:
https://www.youtube.com/watch?v=7xsUeYjBA_k

  • Happens with global objects, that are local to the client as well:

https://www.youtube.com/watch?v=DbmhZKL77qs&feature=youtu.be

Details

Severity
Major
Resolution
Open
Reproducibility
Always
Operating System
Windows 10 x64
Category
General
Steps To Reproduce
  1. Create local vehicle on Passarger Client.
  2. Get in vehicle as passanger.
  3. Let sb. drive the vehicle
Additional Information

I put this on Major becase all objects in the Surrounding get damage and explode

Event Timeline

bjoerngalaxi edited Additional Information. (Show Details)
dedmen changed the task status from New to Acknowledged.Apr 15 2020, 12:21 PM
dedmen raised the priority of this task from Normal to Urgent.

The problem is observed not only with cars, but in general with objects that belong to CfgVehicles

https://imgur.com/a/pfI6nKe

This synchronization problem began after yesterday's update.

bjoerngalaxi renamed this task from Many createVehicleLocal'ed object classes like"Land_CashDesk_F" causing huge desync for passengers to Local objects causing huge desync for vehicle passengers.Apr 15 2020, 1:52 PM
reekoj added a subscriber: reekoj.Apr 15 2020, 2:30 PM

It's seems to be worst with low fps on server-side.
https://www.twitch.tv/theroyalebros/clip/CallousAmericanMelonTBCheesePull
https://www.youtube.com/watch?v=B5zjIb29Ht0
Although it's pretty funny to see a truck jump like a sheep to move forward btw.

Azeh added a subscriber: Azeh.Apr 15 2020, 11:15 PM
Gill077 added a comment.EditedApr 16 2020, 1:13 PM

https://gyazo.com/6b67105a8fd69a6b773a4717421b7109

ESP is from Infistar Anti hack

The vehicle is parked in a space-saving manner.

Nociv added a subscriber: Nociv.Apr 16 2020, 2:12 PM
Teeqa added a subscriber: Teeqa.Apr 16 2020, 2:29 PM

With this bug isn't playable a life server.
I'm downgrade to 1.96 and wait for a fix for this desync problem. :\

dedmen changed the task status from Acknowledged to Feedback.Apr 17 2020, 1:43 PM

Hotfix life on Profiling branch https://community.bistudio.com/wiki/Arma_3_Steam_Branches
Dropbox is not up yet but will be soon-ish.
Please install on server and client and see if that fixes the issue.

dedmen claimed this task.Apr 17 2020, 1:43 PM

Installed on Server and Client: https://i.imgur.com/n4vLuft.png

Version: 1.98.146356

Didn't fix the local/remote issue.

Unknown Object (User) added a subscriber: Unknown Object (User).Apr 17 2020, 5:57 PM
Unknown Object (User) added a comment.Apr 18 2020, 12:12 AM

Good evening,
We have carried out many tests and it seems that the problem occurs when one vehicle is attached to another vehicle with the attachTo command.
When the base vehicle and the attached vehicle are spawn and driven by the same person, no problem but when it is different people who do this, the desynchronization concerns appear for the passages and do strangest things.
Hope this helps you, have a good evening and good luck!

In T150345#2047147, @tomfcz wrote:

Good evening,
We have carried out many tests and it seems that the problem occurs when one vehicle is attached to another vehicle with the attachTo command.
When the base vehicle and the attached vehicle are spawn and driven by the same person, no problem but when it is different people who do this, the desynchronization concerns appear for the passages and do strangest things.
Hope this helps you, have a good evening and good luck!

This problem appears not only because of the attachTo command, but also in general when using the technique, at the local level the car that you use behaves differently, but at the global level, your car may desynchronize.

from what I can see through our testing on RebornRP, it happens when the vehicle is still moving when the player gets out.

New profiling build with potential fix for the last leftover issues
1.98.146368

dedmen renamed this task from Local objects causing huge desync for vehicle passengers to Multiplayer Vehicle desynchronization/floating/flying.
dedmen added subscribers: Wulf, razazel.

Profiling branch is working fine for us, vehicles can ram each other without going into space or under the map. No desync on moving vehicles or if you are in passenger seat.

I'm testing Profiling few days now. Looks better, but some issue reported:

https://youtu.be/y95L1WUIAcs

Wulf added a comment.May 4 2020, 9:36 AM

How is the desync after the last hotfix. Are you still experiencing any issues?

Looks like normal arma desync now.
Thanks a lot.

MaxMonroe added a comment.EditedMay 4 2020, 10:47 AM

Yes it’s better now, thanks

dedmen closed this task as Resolved.May 18 2020, 11:55 AM