#multiplayer | Unreal Source | Page 496

meager spade Oct 5, 2019, 6:27 PM

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why would you need to replicate a float 20 times per second?

tardy cosmos Oct 5, 2019, 6:29 PM

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just because I am lazy. I just want to sincronize the cooldown between server and client, and instead of make a function that triggers in both side, I just want the client get the info from the variable each time the cooldown changes

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so instead of do this, if it is cheap, I would just replicate the float instead of doing the other logic

meager spade Oct 5, 2019, 6:34 PM

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i mean go for it

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its 4 bytes to replicate

high current Oct 5, 2019, 6:42 PM

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you can replicate timelines

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the most lazy solution 😄

tardy cosmos Oct 5, 2019, 6:42 PM

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I will think about timelines,makes sense

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is 4 byte per message I guess, so 20 * 4 per second if I change 20 times per second

meager spade Oct 5, 2019, 6:50 PM

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should only change it every .1 second

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so 10 times per second

tardy cosmos Oct 5, 2019, 6:51 PM

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thanks!

vapid egret Oct 5, 2019, 7:13 PM

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has anyone been able to develop a tcp client system that works with ue4 yet?

summer nova Oct 5, 2019, 7:20 PM

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@meager spade one very important detail

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the CPU cost of server replication is directly proportional to how many objects are replicated

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not how many replicated properties they have

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1 god-actor with 100 replicated variables is a lot more efficient than 1 actor with 10 components of 10 vars each

meager spade Oct 5, 2019, 7:27 PM

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yeah that i understand, think i also heard it spoke about in the Replication Graph talks

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but it makes sense

twin juniper Oct 5, 2019, 8:16 PM

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how do I enable client side input on a possessed pawn?

meager spade Oct 5, 2019, 8:16 PM

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it should automatically be enabled, input is on the local player

twin juniper Oct 5, 2019, 8:17 PM

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I'm simulating with split screen

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sorry not split screen, two windows

simple pollen Oct 5, 2019, 8:19 PM

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I'm not sure what you mean, client side is the same as local?

twin juniper Oct 5, 2019, 8:22 PM

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yeah well the way Im doing it doesnt work but I have little understanding of multiplayer so far

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I create players

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with this BP

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following a tut

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📎 unknown.png

worthy wasp Oct 5, 2019, 8:42 PM

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I hate to ask a question in the wrong channel - i'm unsure if its Engine-Source related or Multiplayer - but i'll drop it here too....

Not sure if this is the right channel - but i thought it was relevant - i'm building a project that includes the LOBBY module - but when i include its module - i get the following error when trying to open my project... Not finding anything relevant on google searches and i'm a bit stumped - i dont see any other dependancies to the Lobby module.... Source build 4.23

"Missing import: UE4Editor-Lobby.dll"

winged badger Oct 5, 2019, 8:43 PM

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you need to add a dependency for all external modules you're using in your.build.cs

worthy wasp Oct 5, 2019, 8:44 PM

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i understand that - and specifically i already did add "lobby" in the build.cs

simple pollen Oct 5, 2019, 8:44 PM

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Add exceptions in your antivirus and firewall.

worthy wasp Oct 5, 2019, 8:44 PM

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https://i.imgur.com/dQN584F.png

Imgur

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no antivirus on this computer (dont knock lol) but firewall - what would i be looking at adding?

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port or program?

simple pollen Oct 5, 2019, 8:45 PM

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Well if you don't have antivirus then forget it since your firewall won't really do anything like this.

worthy wasp Oct 5, 2019, 8:45 PM

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hell i'll just disable it real quick - see if thats even the issue

simple pollen Oct 5, 2019, 8:46 PM

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I was considering if it was a folder permission or folder intercepting problem.

worthy wasp Oct 5, 2019, 8:46 PM

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ok - yah no AV - but i'll disable FW real quick to see if thats it

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naw same thing

simple pollen Oct 5, 2019, 8:50 PM

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Hmm

worthy wasp Oct 5, 2019, 8:50 PM

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launch error is: https://i.imgur.com/3p4tGr9.png

But logs show :

LogWindows:   Missing import: UE4Editor-Lobby.dll
LogWindows:   Looked in......```

Imgur

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it looks in several different places - doesnt find it.

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i've searched manually - UE4Editor-Lobby.dll doesnt exist anywhere in my project or engine source....

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i dont have to implement it as a module somehow do i in the Project.cpp ?

simple pollen Oct 5, 2019, 8:52 PM

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How did you add it ?

worthy wasp Oct 5, 2019, 8:52 PM

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i already showed it above - but here goes again https://i.imgur.com/dQN584F.png

Imgur

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public or private - neither work to clear this issue - but both compile fine in VS

winged badger Oct 5, 2019, 8:53 PM

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that should search engine and plugins folders

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so you didn't actually use the Lobby module, just added it as a dependency in the .build.cs

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?

worthy wasp Oct 5, 2019, 8:53 PM

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oh its heavily used

simple pollen Oct 5, 2019, 8:53 PM

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I think he didn't add the actual dependency yet.

winged badger Oct 5, 2019, 8:54 PM

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and where is it physically on disk?

worthy wasp Oct 5, 2019, 8:54 PM

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several classes that inherit from Lobby module classes

simple pollen Oct 5, 2019, 8:54 PM

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Adding strings to your PublicDependencyModuleNames won't actually do much unless you've imported or included the Lobby Module.

worthy wasp Oct 5, 2019, 8:54 PM

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C:\UE4Source\UnrealEngine-4.23\Engine

winged badger Oct 5, 2019, 8:54 PM

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that is typically done in .uproject file

worthy wasp Oct 5, 2019, 8:54 PM

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oh well

simple pollen Oct 5, 2019, 8:54 PM

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Yes.

winged badger Oct 5, 2019, 8:54 PM

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VS doesn't give a crap about that one

worthy wasp Oct 5, 2019, 8:55 PM

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that maybe an issue there - lemme try that

simple pollen Oct 5, 2019, 8:55 PM

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VS generally doesn't really do much interaction with UE..

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It's the other way around if there's any.

winged badger Oct 5, 2019, 8:55 PM

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its just that 99% of the people add a plugin in .uproject, then forget the build.cs dependency for compiling the project

simple pollen Oct 5, 2019, 8:55 PM

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Yes, haha, It's normally not the other way around xD

winged badger Oct 5, 2019, 8:55 PM

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(99% that end up with errors)

worthy wasp Oct 5, 2019, 8:56 PM

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I just added it here: THis is correct right? https://i.imgur.com/H9SwotU.png

Imgur

winged badger Oct 5, 2019, 8:56 PM

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if its included as "Lobby" in PublicDependencies

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should be "Name" : "Lobby" iirc

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unless you have a module that depends on Lobby module

worthy wasp Oct 5, 2019, 8:57 PM

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oh i see- sorry

winged badger Oct 5, 2019, 8:58 PM

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in which case you should visit the .uproject of the module that needs the Lobby, instead of the main one

worthy wasp Oct 5, 2019, 9:01 PM

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ok i've definitely done this wrong - is the Type or LoadingPhase different for this? It asked if i wanted to rebuild "Lobby" I selected yes and "Could not be compiled. Try rebuilding from source manually" I am/have lol

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https://i.imgur.com/n9DtQeQ.png

Imgur

polar lotus Oct 5, 2019, 9:13 PM

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How can I get the current session result from blueprint

worthy wasp Oct 5, 2019, 9:18 PM

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@winged badger @simple pollen - completely wrong outlook on my part.... i was looking at it too literally. The correction was to add Plugin to the .uproject file "OnlineFramework"

Thanks again for chiming in to help! ❤

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@polar lotus - do youhave Advanced Sessions plugin?

polar lotus Oct 5, 2019, 9:19 PM

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yes

worthy wasp Oct 5, 2019, 9:19 PM

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theres a node (been a few years since i used this plugin) in there to pull ... but when you Search/Join session - you NEED TO STORE IT

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whatever you join is what you are CURRENT IN

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there is no GetCurrentSession in that pugin (that i remember)

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FYI store it in your GameInstance - so its not re-instantiated @ map travels

polar lotus Oct 5, 2019, 9:20 PM

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I need to call this from the session creator too

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its easy from the client because of the session found

worthy wasp Oct 5, 2019, 9:21 PM

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CreateSession - has a return session struct does it not?

polar lotus Oct 5, 2019, 9:21 PM

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nope

worthy wasp Oct 5, 2019, 9:21 PM

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are you C++ friendly?

polar lotus Oct 5, 2019, 9:21 PM

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📎 unknown.png

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barley

worthy wasp Oct 5, 2019, 9:21 PM

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ok stand by one sec

polar lotus Oct 5, 2019, 9:22 PM

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I understand it but I cant write a script on my own

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I wrote a node that encodes a base64 string but thats it

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btw thanks

worthy wasp Oct 5, 2019, 9:22 PM

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if we cant find the answer....

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https://answers.unrealengine.com/questions/530824/how-to-get-the-current-session-with-the-onlinesubs.html?sort=oldest

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i hate to shun you off liek that though - give me a min ute to do some digging

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otherwise - apparently Shootergame does it when they CREATE SESSION

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but i'm almost certian they do it in 100% code

polar lotus Oct 5, 2019, 9:24 PM

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Im using steam

worthy wasp Oct 5, 2019, 9:24 PM

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aye

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theres some code here that you can use...

polar lotus Oct 5, 2019, 9:25 PM

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yeah shootergame is all c++

worthy wasp Oct 5, 2019, 9:25 PM

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if your not code friendly - this wont help much....

polar lotus Oct 5, 2019, 9:25 PM

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I might be able

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I understand c++ but I will need some help

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Im not a total noob

worthy wasp Oct 5, 2019, 9:25 PM

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    if (OnlineSub)
    {
        IOnlineSessionPtr SessionInt = OnlineSub->GetSessionInterface();
        if (SessionInt.IsValid())
        {
            FNamedOnlineSession* Session = SessionInt.IsValid() ? SessionInt->GetNamedSession(GameSessionName) : NULL;
            if (Session && Session->SessionInfo.IsValid())
            {
                return Session->SessionInfo->GetSessionId().ToString();
            }
        }
    }

polar lotus Oct 5, 2019, 9:26 PM

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where do I put this

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I have a BP gameInstance class

worthy wasp Oct 5, 2019, 9:26 PM

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anywhere you want its a getter - but for this particular instance it returns an FString

polar lotus Oct 5, 2019, 9:26 PM

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thats fine

worthy wasp Oct 5, 2019, 9:26 PM

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you can take ou tthe FString - because its getting a full on struct FNameOnlineSession

polar lotus Oct 5, 2019, 9:27 PM

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where Should I put this

worthy wasp Oct 5, 2019, 9:27 PM

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one sec - lemme see if this struct is BlueprintType

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otherwise we'll have to convert it

polar lotus Oct 5, 2019, 9:27 PM

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Can I put this in a BP function library

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and Make it in to a node

worthy wasp Oct 5, 2019, 9:28 PM

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one second please...

polar lotus Oct 5, 2019, 9:28 PM

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ok

worthy wasp Oct 5, 2019, 9:31 PM

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it looks as though both the FNamedOnlineSession (which is a FOnlineSession) are both not blueprint type - so youre going to have to make ur own BlueprintType struct - and move over hte information.... i know for a fact that you cant include FUniqueNetId as a blueprint type... so convert that to a string.... same with the other information....

There has to be an example of the conversions in AdvancedSessions plugin for the JoinSession (it returns a BlueprintType struct) - see what that struct is and how its populating its information - as it has to pull from one of these types of structs above

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i dont have the plugin on my system - so i'm not of much help there.

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but look specifically at the funciton (IN CODE) for JoinSession or SearchSession - they both output that struct

polar lotus Oct 5, 2019, 9:31 PM

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ok let me dig

worthy wasp Oct 5, 2019, 9:32 PM

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if you run into any problems - hit me up

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👌

polar lotus Oct 5, 2019, 9:32 PM

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dude. thanks

worthy wasp Oct 5, 2019, 9:32 PM

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my pleasure

polar lotus Oct 5, 2019, 9:32 PM

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thanks so much for your help

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im only 14 and Im trying to make a multiplayer game

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Im using unreal to learn c++

worthy wasp Oct 5, 2019, 9:33 PM

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you are lightyears beyond my 14 year old son lol

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i wish he had your ambition

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i've tried to include him into my projects... he shows not even the slightest bit of interest

thin stratus Oct 5, 2019, 9:33 PM

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Not everyone has to become a gamedev

worthy wasp Oct 5, 2019, 9:33 PM

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hehehe i dont try to force it on him

polar lotus Oct 5, 2019, 9:33 PM

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I was kinda an engineer in general for most of my life

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I do electronics projects in my spare time

worthy wasp Oct 5, 2019, 9:33 PM

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i was jus ttrying to find his strengths as a child

thin stratus Oct 5, 2019, 9:34 PM

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But peeps, put this to #lounge then though

polar lotus Oct 5, 2019, 9:34 PM

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I build my own PC

fervent yacht Oct 5, 2019, 9:34 PM

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My 9 year old daugher likes blueprints, I'd let them play with that.

worthy wasp Oct 5, 2019, 9:34 PM

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undestood - sorry

polar lotus Oct 5, 2019, 9:34 PM

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lets head to lounge

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@worthy wasp which source file did you want me to look at

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Can I integrate that code in to a BP Function Library?

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and make it a node

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that would be a life saver

polar lotus Oct 5, 2019, 10:08 PM

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I just need a reference of the current session

thin stratus Oct 5, 2019, 10:08 PM

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That function only gives you the SessionID as a string.

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What do you need that ref for?

polar lotus Oct 5, 2019, 10:09 PM

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setting as a variable so the host can share the ID for other players to joib

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join

cunning shoal Oct 5, 2019, 10:10 PM

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Hey guys, I've been struggling on an issue for a few days now and I was hoping you could help me out. I'm noticing On Rep functions for variables don't fire the first time in my code. I have an ammo box, player walks over it and it goes away (visibility/collision changed), and a timer brings it back. This works great if the client is in the relevancy (net cull) distance, but if it's outside of it and comes in, it does not run the OnRep function. If the client is there when it's set to invisible, and goes outside relevance zone, and comes back later it works

thin stratus Oct 5, 2019, 10:10 PM

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So you want your current host to join a new game, becoming a client and taking their own clients with them? @polar lotus

polar lotus Oct 5, 2019, 10:10 PM

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no

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I want a host to make a game, tell their real life friends to play with them and tell them the key so they can join it

thin stratus Oct 5, 2019, 10:11 PM

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But you are using an online subsystem for this or?

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E.g. Steam?

polar lotus Oct 5, 2019, 10:11 PM

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yeah Im using steam

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im using the steam OSS

thin stratus Oct 5, 2019, 10:11 PM

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It should be enough to share your own steam ID then

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No need to expose anything like this.

polar lotus Oct 5, 2019, 10:11 PM

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I want it to be displayed on the host's screen

thin stratus Oct 5, 2019, 10:12 PM

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Right, also what about just normal invites?

polar lotus Oct 5, 2019, 10:12 PM

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Invites?

thin stratus Oct 5, 2019, 10:12 PM

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Well, Steam has Friendlists that allow inviting your friends.

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If you use steam it's pretty weird you want to join via the steamID

polar lotus Oct 5, 2019, 10:12 PM

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you have to get an AppID for that

thin stratus Oct 5, 2019, 10:12 PM

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You have to anyway

polar lotus Oct 5, 2019, 10:12 PM

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no you dont

thin stratus Oct 5, 2019, 10:13 PM

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You can't distribute on Steam otherwise

polar lotus Oct 5, 2019, 10:13 PM

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Im using steam just as an online subsystem

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Im not putting it up on steam

thin stratus Oct 5, 2019, 10:13 PM

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That's not really how that works though. You are sharing the AppID with thousands of devs then

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Also even then you can perform invites

polar lotus Oct 5, 2019, 10:14 PM

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?

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how?

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I thought you have to apply for that

thin stratus Oct 5, 2019, 10:14 PM

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If you use Steam you are always at least using AppID 480

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Which is of Spacewar

polar lotus Oct 5, 2019, 10:14 PM

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yeah, I a

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am

thin stratus Oct 5, 2019, 10:14 PM

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This is literally what everyone uses during development

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ServerLists will often not show anything

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And it's limited in features.

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You can of course do whatever you want, but it's pretty weird to use Steam with only the dev ID

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Either way, for the ID you want you don't need to query the Session iirc

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It's enough to expose it via UniqueNetId of the PlayerState

polar lotus Oct 5, 2019, 10:15 PM

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Its just a little game Im doing in my free time to play with friends

thin stratus Oct 5, 2019, 10:15 PM

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Means you could make your own APlayerState C++ class.

polar lotus Oct 5, 2019, 10:16 PM

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Im not the best with c++

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Im trying to keep this mostly BP

thin stratus Oct 5, 2019, 10:16 PM

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That's pretty much needed when doing online stuff.

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You can't get that ID String without

polar lotus Oct 5, 2019, 10:16 PM

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its working fine without it

thin stratus Oct 5, 2019, 10:17 PM

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You want that ID, so you gotta use some C++

polar lotus Oct 5, 2019, 10:17 PM

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yeah but Im not sure exactly how

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It just seems like its already there

thin stratus Oct 5, 2019, 10:18 PM

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You can expose it relatively easy by making a custom APlayerState class

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And writing a simple FString GetUniqueIdAsString() const; function

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That then returns the UniqueId as String

polar lotus Oct 5, 2019, 10:18 PM

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Wont I have to add a bunch of other stuff

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You cant make a PlayerState with JUST that can you?

thin stratus Oct 5, 2019, 10:19 PM

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hm?

polar lotus Oct 5, 2019, 10:20 PM

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If I were to create a playerState class instead of using the default one, Wouldnt I have to write a bunch of other code

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You can't have an empty PlayerState class can you?

thin stratus Oct 5, 2019, 10:20 PM

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Not really

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Sure you can

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It inherits the stuff from the APlayerState class

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That's what all your BP classes do too

polar lotus Oct 5, 2019, 10:21 PM

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So you're saying I can create a new C++ playerstate that only gets the sessionId?

thin stratus Oct 5, 2019, 10:21 PM

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Yes

polar lotus Oct 5, 2019, 10:22 PM

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Why can't I make it in to a blueprint node

thin stratus Oct 5, 2019, 10:22 PM

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That will become a BP node eventually

polar lotus Oct 5, 2019, 10:22 PM

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?

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Im confused

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How can a PlayerState become a BP Node?

thin stratus Oct 5, 2019, 10:22 PM

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Not the PlayerState, but the function you will make

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It will just be a BP node that you can use from your PlayerState

polar lotus Oct 5, 2019, 10:23 PM

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Ok, So how would I do that?

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I made a PlayerState class

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in c++

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Can I use just 1

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For lobby and game

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i just use

    if (OnlineSub)
    {
        IOnlineSessionPtr SessionInt = OnlineSub->GetSessionInterface();
        if (SessionInt.IsValid())
        {
            FNamedOnlineSession* Session = SessionInt.IsValid() ? SessionInt->GetNamedSession(GameSessionName) : NULL;
            if (Session && Session->SessionInfo.IsValid())
            {
                return Session->SessionInfo->GetSessionId().ToString();
            }
        }
    }```

thin stratus Oct 5, 2019, 10:25 PM

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That's not what you need

polar lotus Oct 5, 2019, 10:25 PM

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then what?

thin stratus Oct 5, 2019, 10:26 PM

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You just need to return UniqueNetIdRepl.ToString(); or similar, don't know the exact line out of my head

polar lotus Oct 5, 2019, 10:26 PM

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and that Returns the sessionID/SteamID of host?

thin stratus Oct 5, 2019, 10:27 PM

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If you are using Steam OnlineSubsystem, yes

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Well also for the clients of course, but you'll only display it in the HostGame screen anyway I guess

polar lotus Oct 5, 2019, 10:28 PM

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ko

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ok

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where do I add it, Don't I have to include the steam OSS library?

📎 unknown.png

thin stratus Oct 5, 2019, 10:32 PM

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No you don't. This is interfaced by UE4.

polar lotus Oct 5, 2019, 10:32 PM

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ok

thin stratus Oct 5, 2019, 10:32 PM

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You have to add the declaration to the header file and the implementation of the function to the cpp file (the one open in your screen)

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/** @return Unique Net ID of the Player (e.g. SteamID) as FString. */
UFUNCTION(BlueprintPure, Category = "Online")
    FString GetUniqueNetID() const;

FString AVWFPlayerState::GetUniqueNetID() const
{
    if(UniqueId.GetUniqueNetId.IsValid())
        return UniqueId.GetUniqueNetId()->ToString();

    return FString("");
}

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Something like this. Top thing is Declaration, bottom is implementation.

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Haven't tested this though.

polar lotus Oct 5, 2019, 10:33 PM

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Im familiar with BlueprintCallable and BlueprintPure

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📎 unknown.png

thin stratus Oct 5, 2019, 10:37 PM

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Might be that you need to include "Online.h" at least

polar lotus Oct 5, 2019, 10:37 PM

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it dosent exist

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it cant open it

thin stratus Oct 5, 2019, 10:38 PM

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:P I have it included so it does exist

polar lotus Oct 5, 2019, 10:38 PM

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Some forum post says I have to add something to the cs file

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for the build

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📎 unknown.png

thin stratus Oct 5, 2019, 10:40 PM

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Yeah, 1 sec.

polar lotus Oct 5, 2019, 10:41 PM

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ok

thin stratus Oct 5, 2019, 10:50 PM

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Alright, lemme have a look

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@polar lotus In your build.cs, you should have something saying PublicDependencyModuleNames.AddRange

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There should technically already be something in that list

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Add "OnlineSubsystem" (with "") to it

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That should allow you to include Online.h

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I gotta head to bed now (1am here)

polar lotus Oct 5, 2019, 10:53 PM

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this is what I have

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📎 unknown.png

thin stratus Oct 5, 2019, 10:53 PM

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Upper one

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"PublicDependency..."

polar lotus Oct 5, 2019, 10:53 PM

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ok

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Still says left of .IsValid

thin stratus Oct 5, 2019, 10:55 PM

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But the include works now?

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Try putting it into both Public and PrivateDependency ¯_(ツ)_/¯

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I have so much included into our project, it's hard to find where one was allowing this

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This should def compile, just tried it

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Ah fudge

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Change this

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if(UniqueId.GetUniqueNetId.IsValid())
to if(UniqueId.GetUniqueNetId().IsValid())

winged badger Oct 5, 2019, 10:58 PM

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ummm.... if its a compiler error... its not the .build.cs include

thin stratus Oct 5, 2019, 10:58 PM

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should have typed it and then copied it instead of doing it out of my head

winged badger Oct 5, 2019, 10:58 PM

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those explode when linker starts

thin stratus Oct 5, 2019, 10:59 PM

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Yeah wasn't sure if the IsValid fail was refering to the struct being unknown

winged badger Oct 5, 2019, 10:59 PM

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missing () ends up with "use & to create pointer to member" error

thin stratus Oct 5, 2019, 10:59 PM

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I simply forgot the () when I typed the code here :P As said, didn't test it

winged badger Oct 5, 2019, 10:59 PM

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can't remember the start of the text

thin stratus Oct 5, 2019, 10:59 PM

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Well it does compile fine in our playerState

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And we only have the Online.h included into that

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So it can't be much

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XZ is already rather far, just help him with the last steps

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I have to get into bed

winged badger Oct 5, 2019, 11:01 PM

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gn

rich leaf Oct 5, 2019, 11:40 PM

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I need some help Unreal community!
Please check this out and offer me any assistance you can.
We are working on a Networked game hat involves two teams : one FPS and one RTS. When each player dies they spawn a pickup that the other team can collect.

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When the FPS collectible spawns it does fine but when the RTS Collectible does, UE4 crashes. ☹️

winged badger Oct 5, 2019, 11:44 PM

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spawns or is interacted with?

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what's the difference in spawning them?

rich leaf Oct 5, 2019, 11:45 PM

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Any suggestions what may be going wrong?

📎 image0.jpg

meager spade Oct 5, 2019, 11:45 PM

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nice selfy bruh

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so what is "red" and "blue"

rich leaf Oct 5, 2019, 11:46 PM

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I’m the arms not the face. lol thx tho

winged badger Oct 5, 2019, 11:46 PM

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was just about to ask that

rich leaf Oct 5, 2019, 11:46 PM

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The materials (color) designating the pickup type

winged badger Oct 5, 2019, 11:46 PM

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and whats the entire callstack?

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crash might very well have nothing to do with the SetSide

rich leaf Oct 5, 2019, 11:48 PM

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what are you thinking it may be then?

meager spade Oct 5, 2019, 11:48 PM

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can you get it to crash and show the callstack?

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would help a lot

rich leaf Oct 5, 2019, 11:48 PM

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k

meager spade Oct 5, 2019, 11:48 PM

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also i am not sure if SetMaterial handles a passed in null, if Red is not valid

winged badger Oct 5, 2019, 11:49 PM

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its also dereferencing myMesh

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it might be called on a nullptr, the SetSide()

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or the crash might be unrelated to the pickup at all

rich leaf Oct 6, 2019, 12:25 AM

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We figured it out thx. Another issue tho: during player using sprint: Press key= multiply movement rate to 1.5x = the framrate drips significantly. Research found this subject from 2015 saying that the player position is calculated on the server side and client side and may not be in sync?

maybe we could set the Server to calculate position and force it to be the same speed somehow if that’s the problem?

winged badger Oct 6, 2019, 12:25 AM

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you should set it both client and server side

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and a difference in speed is likely to cause jitter, but not FPS drop

rich leaf Oct 6, 2019, 12:32 AM

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yeah its more of a jitter - any idea how to alieviate that?

winged badger Oct 6, 2019, 12:33 AM

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ZloToday at 2:25 AM
you should set it both client and server side

rich leaf Oct 6, 2019, 12:35 AM

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ok thx

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its only 5:35 pm here - thx for being a late nighter - ill be working on Unreal until at least that time here in Los Angeles. 🙂

winged badger Oct 6, 2019, 12:49 AM

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and by set it i mean simulate on owning client

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don't set on server then replicate

gray scroll Oct 6, 2019, 12:57 AM

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📎 unknown.png

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i have a magazine that i set simulate on so it drops

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but it seems to lag on clients

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any idea why?

winged badger Oct 6, 2019, 1:09 AM

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because you spawn it on server and it appears on client only when the actor replicates?

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don't spawn the actor for the magazine drop if you're going to destroy it right after, a particle effect can do the trick just fine

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also, server authority for a prop is not required

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which means there is no reason to set the Lifetime server side

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which means, even if you are going to go the spawn the Actor way, you should make it not replicated and spawn it locally on each machine

gray scroll Oct 6, 2019, 1:32 AM

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but then other players wont see it drop right? @winged badger

winged badger Oct 6, 2019, 1:32 AM

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"and spawn it locally on each machine"

velvet parcel Oct 6, 2019, 2:34 AM

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If a blueprint does not replicate is it still able to use RPCs and Rep notify?

fossil spoke Oct 6, 2019, 2:36 AM

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No.

velvet parcel Oct 6, 2019, 2:36 AM

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hehe thanks\

graceful cypress Oct 6, 2019, 2:51 AM

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anybody have a good guide to make a simple multiplayer that a dumbass like me could understand?

meager spade Oct 6, 2019, 2:57 AM

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simple multiplayer what?

velvet parcel Oct 6, 2019, 3:07 AM

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There are too many bullshit things you gotta setup with game mode, game state ect..

molten pasture Oct 6, 2019, 3:07 AM

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hey guys, anyone here using UWorks on 4.23 yet?

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and yes, no good "instant classic gamemodes" button :p

meager spade Oct 6, 2019, 3:08 AM

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@velvet parcel what is so bullshit about it?

molten pasture Oct 6, 2019, 3:08 AM

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multiplayer still has a steep learning curve, I wouldn't recommend touching it until you've made a single player game or two first

meager spade Oct 6, 2019, 3:08 AM

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how can they make a "gamemode" for EVERY type of game out there?

molten pasture Oct 6, 2019, 3:08 AM

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? is there a question in there?

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rhetorical, I see ;p

meager spade Oct 6, 2019, 3:10 AM

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yeah rhetorical

molten pasture Oct 6, 2019, 3:10 AM

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yeah, speaking of which, any good recent examples for game modes? ShooterGame is only clean reference I know of

meager spade Oct 6, 2019, 3:10 AM

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what kinda game you making?

molten pasture Oct 6, 2019, 3:11 AM

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counter-strikeish defusal style game mode

meager spade Oct 6, 2019, 3:11 AM

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i mean UT4 has some examples

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but yeah they are kinda intertwined into the game

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as GameMode's are normally specific to your game

velvet parcel Oct 6, 2019, 3:20 AM

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@meager spade Mainly because the largest hurdle to overcome is the fact that not all things like gamestate, playerstate, player controller, game mode. game instance, HUD will exist at the very start when you login.

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So you have to make a system that checks for all of these things before moving forward which is often unreliable.

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It should be a core function of the editor to have something in place as a part of begin play for all blueprints.

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Making sure all of that crap exists is kind of an unsaid hardship of getting into multiplayer dev. You end up getting bugs that simply make things seem like they are broken

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Not only that but those things are not always created in the same order either...

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This is pretty bullshit

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😄

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Why the hell would anyone ever want to run game logic before the playerstate exists for example. The engine should automatically force everything to pause until all of the core things exist by default

austere snow Oct 6, 2019, 3:29 AM

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Is a PlayerController server, client, or shared?

velvet parcel Oct 6, 2019, 3:30 AM

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I run RPCs for server and client on the player controller

austere snow Oct 6, 2019, 3:30 AM

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so both?

velvet parcel Oct 6, 2019, 3:31 AM

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pretty sure on that

austere snow Oct 6, 2019, 3:32 AM

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So I should be using "has authority"

fossil spoke Oct 6, 2019, 3:33 AM

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PlayerController exists on the Server and the Client that owns the PlayerController.

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Other Clients DO NOT have eachothers PlayerControllers, only their own.

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Clients can make use of the PlayerState to share information about eachother.

austere snow Oct 6, 2019, 3:34 AM

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Oh that's what that is for

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And a default player pawn, is that also shared?

velvet parcel Oct 6, 2019, 4:04 AM

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I feel more inclined to share a lot of data on the player pawn for stuff like health ect. That allows me to share data among clients too. Right?

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Or is that a bad way to do it?

raw quarry Oct 6, 2019, 4:43 AM

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I'm getting a strange and seemingly random lag problem with my game. Every once in a while, a player will start appearing to lag from the perspective of another player. They'll start floating around and be nowhere near where they actually are. So player A will appear to be lagging to player B. The weird part is that neither player A or player B appear to be lagging to anybody else. On top of that, nobody else lags from player B's perspective. It'll just randomly sometimes happen for one player. For context, this is unreal 4.18

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I can't consistently reproduce it either, it just sporadically will happen

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any ideas would be much appreciated

winged badger Oct 6, 2019, 5:00 AM

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@raw quarry any specific distances involved?

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any changes in possessions?

raw quarry Oct 6, 2019, 5:01 AM

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no change in possession

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and the distances can be pretty far

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sometimes theyll just float in one position

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off the ground even

winged badger Oct 6, 2019, 5:02 AM

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can you even semi-reliably reproduce it?

raw quarry Oct 6, 2019, 5:02 AM

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nope lol

winged badger Oct 6, 2019, 5:03 AM

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are the pawns always relevant?

raw quarry Oct 6, 2019, 5:03 AM

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yes

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well

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the setting isnt turned on

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but it does that even if im standing next to their "ghost"

winged badger Oct 6, 2019, 5:04 AM

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relevancy breaking is the most likely scenario, although

raw quarry Oct 6, 2019, 5:04 AM

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ill turn that just in case then

winged badger Oct 6, 2019, 5:04 AM

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they shouldn't even be visible then

raw quarry Oct 6, 2019, 5:04 AM

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what do you mean?

winged badger Oct 6, 2019, 5:05 AM

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non relevant Actors that aren't loaded from the package don't exist on clients

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is it a specific player, is one of the two always a listen server host?

raw quarry Oct 6, 2019, 5:07 AM

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nope a random plaer

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its on a dedicated server

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and itll happen randoml even when i could see them fine previously

winged badger Oct 6, 2019, 5:08 AM

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you don't have an inappropriate GetPlayerController[0] that can get the wires crossed?

raw quarry Oct 6, 2019, 5:08 AM

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not sure what you mean

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but I dont think so

winged badger Oct 6, 2019, 5:09 AM

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that one is dangerous with dedis

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its fine when called client side, but if called server side, havoc

raw quarry Oct 6, 2019, 5:09 AM

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i use it a decent amount

winged badger Oct 6, 2019, 5:10 AM

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because as far as dedicated server cares

raw quarry Oct 6, 2019, 5:10 AM

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oh yeah i dont use [0] on the dedi ofc

winged badger Oct 6, 2019, 5:10 AM

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GetPlayerController[0] is the first player that logged in

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did you change the default relevancy settings?

raw quarry Oct 6, 2019, 5:10 AM

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nope

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well i just turned on always relevent maybe they will fix it somehow

winged badger Oct 6, 2019, 5:11 AM

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does it ever happen when the other player is within ~15k UU?

raw quarry Oct 6, 2019, 5:11 AM

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yes

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we just had a play test with about 10 people and I saw it happen like twice in an hour

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for a few minutes

winged badger Oct 6, 2019, 5:12 AM

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there is an engine fail that can cause you seeing yourself walking in random direction and not responding to controls

raw quarry Oct 6, 2019, 5:12 AM

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the player doesnt appear to lag to himself

winged badger Oct 6, 2019, 5:12 AM

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but iirc it requires changes in possession to happen

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in any case, the root of the problem is PC not setting Owner on the Pawn

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but that wouldn't break other players, as that pointer would be null on other clients, as they don't have other PCs

raw quarry Oct 6, 2019, 5:14 AM

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right

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and the only possession change that happens is the initial possession when a player spawns

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and its assigned a new pawn

winged badger Oct 6, 2019, 5:15 AM

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CMC?

raw quarry Oct 6, 2019, 5:15 AM

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?

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what about it?

winged badger Oct 6, 2019, 5:15 AM

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CharacterMovementComponent

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its involved?

raw quarry Oct 6, 2019, 5:15 AM

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i mean it's being used, yes

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i'm also using gameplay abilities, but i think this issue started happening before i implemented it

winged badger Oct 6, 2019, 5:16 AM

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what are the network conditions?

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does it happen only in real test over the internet?

raw quarry Oct 6, 2019, 5:16 AM

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ping is about 20ms being hosted on a debian server on digital ocean

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had the same issue on AWS tho

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and yes it's only happened on a test over the internet

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but I haven't really tested it on a localhost server

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and i'm sure the simulated dedicated server wouldn't really show it, and i haven't tested it much with two players in there anyway

winged badger Oct 6, 2019, 5:17 AM

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does it autofix itself after a few seconds, and can other players still see the "lagged out" player fine?

raw quarry Oct 6, 2019, 5:17 AM

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other players see him just fine

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and it fixes itself after like a minute or so

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or 30 seconds idk

winged badger Oct 6, 2019, 5:18 AM

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and the player that sees the other player as lagged out is also visible just fine to everyone else and can see everyone else just fine?

raw quarry Oct 6, 2019, 5:19 AM

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yes

winged badger Oct 6, 2019, 5:19 AM

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any teleporting involved?

raw quarry Oct 6, 2019, 5:19 AM

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which is what's especialyl strange

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yes

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like sometimes the "lagged out" player will float in a spot and then teleport somewhere else

winged badger Oct 6, 2019, 5:19 AM

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i mean as part of normal gameplay mechanics

raw quarry Oct 6, 2019, 5:19 AM

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oh

winged badger Oct 6, 2019, 5:19 AM

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prior to it breaking

raw quarry Oct 6, 2019, 5:20 AM

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there aren't really teleports but there are fast movements

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but it seems to also happen on characters that dont have fast movements

winged badger Oct 6, 2019, 5:21 AM

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how many players?

raw quarry Oct 6, 2019, 5:21 AM

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~10

winged badger Oct 6, 2019, 5:22 AM

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that is basically how all players look like when a listen server host disconnects, before it tosses them to main menu

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just running in whatever straight line the last received update had them moving in

raw quarry Oct 6, 2019, 5:23 AM

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well they dont just run in a straight line

winged badger Oct 6, 2019, 5:23 AM

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but packet loss in server auth environment does not explain this

raw quarry Oct 6, 2019, 5:24 AM

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its acting a bit more like packet loss

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for a specific character

winged badger Oct 6, 2019, 5:24 AM

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yeah, but they update 10 times a second or so

raw quarry Oct 6, 2019, 5:24 AM

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so it would make sense that the "lagged out" character is getting marked is not relevent

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but not sure why

winged badger Oct 6, 2019, 5:24 AM

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and all other packets are being received just fine

raw quarry Oct 6, 2019, 5:25 AM

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cause I can literally be standing right next to the "lagged out" character on my screen and that character shows as being somewhere else for everybody else

winged badger Oct 6, 2019, 5:25 AM

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so its not a temporary fail of network connection

raw quarry Oct 6, 2019, 5:25 AM

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yeah for sure

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its like all packets are being dropped except one now and then for a specific character for like a minute

winged badger Oct 6, 2019, 5:26 AM

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and relevancy uses server positions to calculate distance based relevancy

raw quarry Oct 6, 2019, 5:26 AM

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right

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only thing I can think of is turning on always relevent and see if it happens again

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its hard to test though

winged badger Oct 6, 2019, 5:27 AM

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its not possible that the player was broken while it was still outside 15k UU, then somehow made its way closer?

raw quarry Oct 6, 2019, 5:28 AM

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hmm let me see

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i dont think my map is that big even, checking quick

winged badger Oct 6, 2019, 5:29 AM

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reading the log lognet veryverbose logs could in theory reveal the cause

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but those are so large its downright impossible

raw quarry Oct 6, 2019, 5:29 AM

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hmm the map is about 15k across at the extremes

winged badger Oct 6, 2019, 5:29 AM

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unless you can reliable repro in contained environment

raw quarry Oct 6, 2019, 5:29 AM

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but its still unlikely that they were that far apart

winged badger Oct 6, 2019, 5:30 AM

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the pawns NetCullDistanceSquared is 225M?

raw quarry Oct 6, 2019, 5:30 AM

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yup

winged badger Oct 6, 2019, 5:31 AM

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do you see it responding to any of the controls when its broken?

raw quarry Oct 6, 2019, 5:32 AM

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what do you mean?

winged badger Oct 6, 2019, 5:32 AM

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is the player you see broken basically an automaton

raw quarry Oct 6, 2019, 5:32 AM

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the "lagged out" player doesn't appear to be lagged out to himself or anybody else

winged badger Oct 6, 2019, 5:32 AM

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or does it just move wrong and seem to respond to input otherwise

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as you see it, not as he sees it

raw quarry Oct 6, 2019, 5:33 AM

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it just very sporadic movement

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and if i attack it, it does nothing

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but this is expected because the server sees the player in a different location

winged badger Oct 6, 2019, 5:35 AM

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if it keeps happening with always relevant

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you can wire a control that will find all player pawns locally

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then print the capsule and skeletal mesh locations for those that have a large difference between their locations

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that would at least tell if you have the broken player in the wrong position locally, or just its mesh

raw quarry Oct 6, 2019, 5:37 AM

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ah true true

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ill try that

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thanks!

hoary lark Oct 6, 2019, 5:53 AM

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@raw quarry have you looked into net bandwidth saturation yet

raw quarry Oct 6, 2019, 5:53 AM

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hmm I haven't

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is there a way to do that in unreal?

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or should i just use a packet sniffer

hoary lark Oct 6, 2019, 5:56 AM

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Search this channel for "saturated" you should find a couple messages from me recently. Especially if your game is running at a high frame rate it's worth checking into

raw quarry Oct 6, 2019, 5:56 AM

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will do thanks

hoary lark Oct 6, 2019, 5:57 AM

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TLDR is that unreal only gives you like 56K modem bandwidth by default and the CMC sends out a packet per frame, so at high fps it exceeds default allowances and it stops sending packets

raw quarry Oct 6, 2019, 5:58 AM

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oh... interesting

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well my server is running at 30 fps at the moment

hoary lark Oct 6, 2019, 6:01 AM

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I'm theorizing now and might be wrong but what you're describing might happen if players A and B are running at 200 fps and and players C, D etc are running slower. Because players A and B have both a high upload and high download to hit the ceiling before other clients

raw quarry Oct 6, 2019, 6:02 AM

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hmm but it would probably happen more consistently then

winged badger Oct 6, 2019, 6:03 AM

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it still wouldn't selectively break a single player from a perspective of just one player

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everyone else sees them fine

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so server did get the right data from those clients

hoary lark Oct 6, 2019, 6:06 AM

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If I'm player B and my upload rate is huge because I'm running at 1000 FPS, I might ignore packets from the server to avoid blowing my bandwidth cap (?)

winged badger Oct 6, 2019, 6:06 AM

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upload and download don't run against the same cap

raw quarry Oct 6, 2019, 6:06 AM

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and why would it only ignore packets from one character

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unless that characters packets are just always sent last i guess

winged badger Oct 6, 2019, 6:07 AM

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server won't send more then the cap allowed per client

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and if it doesn't send an update for one of the characters

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it will have higher priority on next evaluation

hoary lark Oct 6, 2019, 6:08 AM

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Yeah maybe it's a dead end hue

twin juniper Oct 6, 2019, 11:31 AM

#

Hi guys I am new to multiplayer. I had some issues with movement but eventually I got it working via replicating a variable and calling an event on tick. This was of course laggy as I sent movement input information to the server which then sent it back to the client, but it worked, I know the correct way is to use character movement component but I wanted to learn both ways. I am simulating 2 player split screen.

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Problem is I am trying to do the same with rotation. 1) what is the correct procedure to rotate in multiplayer, analagous to using 'add movement input' to go back and forward? THis is not an issue though as I can google this. I am just puzzled by 2) as I have this BP

📎 unknown.png

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I am trying to understand how replication works. Rotation is fine on server. On client , if I try and rotate locally it works perfectly but is invisible on server. If I use 'multicast' in my 'right' event it also works on client, though is laggy and is invisible on server. If I use 'replicate to server' then it doesn't work at all. Why? I want to be able to rotate my client and it be visible from server this way just to help me understand, I am sure this will be laggy and not the correct way to do things so I will learn this after, but I am puzzled why this is not working properly

#

I tried setting the 'replicates' flag on all components of my 'Wasp' pawn including the mesh

meager spade Oct 6, 2019, 12:43 PM

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yuck

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dont replicate everything

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dont call a reliable RPC on a function that updates every tick

twin juniper Oct 6, 2019, 1:41 PM

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I'm aware this is the wrong way to do things, I just want to know why it doesn't work at all

worthy perch Oct 6, 2019, 1:58 PM

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From what I read, I'm pretty sure you're not actually sending anything to the server from the client. (Multicasts called from a client only gets called locally).
And just because you mark components as replicated, does not mean all properties on those components will replicate to the client.
And replication only happens down from the server to the client/s.

shy nymph Oct 6, 2019, 2:00 PM

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hey everyone, does anyone have good ressources on how to make a good hit validation system?

i want a projectile to spawn on the client and the server for responsive ness and want the client to have hit authority up to a defined ping, but still want the server to validate the hit

if client and server spawn the projectile and register the hit, how would i go about making the server check if he hit as well and if the hit is the same as the clients

meager spade Oct 6, 2019, 2:13 PM

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smoke and mirrors @shy nymph

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have the client spawn a "dummy" projectile locally

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and server spawn the real projectile (can be hidden with a revelancy check so owning client doesnt see the server projectile) and just have the server projectile do the actual damage

cunning shoal Oct 6, 2019, 2:20 PM

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Hey guys, I've been struggling on an issue for a few days now and I was hoping you could help me out. I'm noticing On Rep functions for variables don't fire the first time in my code, has anyone experienced this?

worthy perch Oct 6, 2019, 2:22 PM

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Should only fire if the old and new values have changed.

cunning shoal Oct 6, 2019, 2:22 PM

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These are my blueprints for testing it right now on an Ammo box

📎 3.JPG

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📎 1.JPG

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📎 2.JPG

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player walks over it and it goes away (visibility/collision changed), and a timer brings it back. This works great if the client is in the relevancy (net cull) distance, but if it's outside of it and comes in, it does not run the OnRep function. If the client is there when it's set to invisible, and goes outside relevance zone, and comes back later it works (re-appears once they hit the relevancy zone)

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@worthy perch yep, and my bool is set to enable by default, but then when a player walks over it, is set to false - so the value does change but it won't update the client if outside of the relevancy zone and comes back in later

cunning shoal Oct 6, 2019, 2:54 PM

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Weird part is I used the example for the chest in the content examples from Epic as reference too (tried without using replicate to server as well)

twin juniper Oct 6, 2019, 5:10 PM

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how should you network cooldown for a ability

#

you cant make the variables accessible from the client cause even a simple program like cheat engine is able to speedhack

thin stratus Oct 6, 2019, 5:31 PM

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Put the cooldown on the server and replicate it?

mystic ember Oct 6, 2019, 6:47 PM

#

Hello i´m new here and i want to learn programming with unreal engine 4. Can someone help me ?

simple pollen Oct 6, 2019, 6:56 PM

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@mystic ember So much content out there, I'd say first of all you should find a common language such as Java, C#, C++, preferably a language that is object oriented, read a book and study some tutorials, maybe even spend your first week with this. Then afterwards when you have some of the basics, you can go on to YouTube video tutorials, look at UE4 Guides and study each and everyone of the basic UE4 templates they offer you as well as the starter tutorials. Learn how to study yourself, be curious and keep searching, eventually start referencing the UE4 Documentation. Once you've done this for a few months you'll be able to really go in-depth with creating games. I know this is so generic, but really, it's really one of the better ways.

mystic ember Oct 6, 2019, 7:01 PM

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@simple pollen Thank you for the advisment, but i learned HTML and i made a internship in at software ag. I dont want to specify that, i just want to say that i didnt found a tutorial that is good enough. I wanted to learn from a advanced user/programmer of UE4.

simple pollen Oct 6, 2019, 7:03 PM

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I can only tell you, even if you found a mentor, the mentor would not be able to tell you what you should create, get started and eventually just throw any and all questions you have somewhere in the related sections here.

mystic ember Oct 6, 2019, 7:03 PM

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@simple pollen Tutorials are specific in one directions, but i want to learn slowley in every direction

simple pollen Oct 6, 2019, 7:03 PM

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That's a way too broad and not a very reasonable action to take.

#

Tutorials only teach you their viewpoint.

#

To learn slowly in every direction can be interpreted as simply learning about everything in phases, therefore reading documentation, reading guides, watching tutorials, experimenting yourself and implementing what you have seen, read and heard, is what can cause you to learn.

mystic ember Oct 6, 2019, 7:06 PM

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@simple pollen Thank you for youre adverment, my problem is i dont know the basics from UE4. I couldnt find a tutorial or a website, that is explaining good the basics.

simple pollen Oct 6, 2019, 7:06 PM

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You can't learn everything in one go, UE4 has no specific limit to what you can do or what you should do.

#

Read the documentation.

#

They also have excellent tutorials to get you started when you open UE4.

mystic ember Oct 6, 2019, 7:10 PM

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@simple pollen I searched someone who could teach me the basics and a little bit more so then i could go in the directions. I know that it is impossible to learn everything, but the tutorials ect cant teach you that what you want its like doing what the computer says, you cant ask him questions

simple pollen Oct 6, 2019, 7:11 PM

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Well, my best advice is still just to jump into a small project that you believe would be easy to create, start from there, then any questions that come up google them or ask in here. Obviously google first because whilst it can be hard to find actual content, UE4 is very saturated knowledgewise.

#

And the same thing you seek is apparent for any knowledge in the world.

thin stratus Oct 6, 2019, 7:12 PM

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This channel is dedicated to #multiplayer and not to general UE4 help.
If you need a tutor, check #looking-for-work or make a post in #looking-for-talent .
There is tons of documentation on UE4 docs, Wiki and YouTube (and a lot of other blogs and posts).

#

Please check #more-resources and #old-rules once more to be sure to post into the right channels.

mystic ember Oct 6, 2019, 7:14 PM

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@thin stratus I´m sorry that i have ask for help in this chanel, but i wanted to search for peoples that are good at programming multiplayergames

thin stratus Oct 6, 2019, 7:15 PM

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Right, but yet you asked for general help and guidance, nothing directly related to multiplayer. :P
Move it to #ue4-general for this.

mystic ember Oct 6, 2019, 7:16 PM

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Sorry that i didnt said it right. It will not happen again

gritty pelican Oct 6, 2019, 7:49 PM

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how to optimize big world in multiplayer, world composition not working with dedicated server

winged badger Oct 6, 2019, 7:50 PM

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how big is big?

gritty pelican Oct 6, 2019, 7:50 PM

#

how to optimize AI in Open World, I made the spawn AI system, while the player enters a certain zone, this is so far my best option

#

@winged badger 6x6 km

#

island

#

in addition to the main island there are 5 more islands 3 by 3 km

winged badger Oct 6, 2019, 7:51 PM

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level streaming should still work

#

how many replicated actors?

gritty pelican Oct 6, 2019, 7:53 PM

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50 players, Static bots, killer bots, save zone, inventory items, all about 10k

#

but bots appear only when the player enters the zone, inventory items do not replicate the position - they are static

#

Many bushes from which you can pick berries

#

Now I have 60 FPS, at high. Given that everything is almost motionless.

#

The biggest problem is the bots.

winged badger Oct 6, 2019, 7:58 PM

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the biggest problem is CMC i'd wager

gritty pelican Oct 6, 2019, 8:00 PM

#

ты русский Зло?

winged badger Oct 6, 2019, 8:01 PM

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nope, and even if i did speak russian i wouldn't do it here

#

there are middlewares like SpatialOS

#

that let you distribute the load between multiple dedicated servers

#

and still use unreal's networking

#

they are not free though

gritty pelican Oct 6, 2019, 8:04 PM

#

Maybe it's better to take a very powerful server?

simple pollen Oct 6, 2019, 8:05 PM

#

One very powerful server ?

winged badger Oct 6, 2019, 8:05 PM

#

not sure it works that way

#

evaluating actors for replication is done on a single thread

simple pollen Oct 6, 2019, 8:05 PM

#

I don't think one server would be able to handle resources of that amount.

#

Indeed.

winged badger Oct 6, 2019, 8:06 PM

#

if you have to evaluate 10k or so actors - expect it to take over 20ms

#

replication graphs and/or dormancy can cut that down though

gritty pelican Oct 6, 2019, 8:06 PM

#

But everything is fine, because replication is for certain clients with a distance of 150 m

winged badger Oct 6, 2019, 8:07 PM

#

but 100 CharacterMovementComponents running around

gritty pelican Oct 6, 2019, 8:07 PM

#

Beyond this distance, replication stops for the client

winged badger Oct 6, 2019, 8:07 PM

#

that is about as much as a server can take

simple pollen Oct 6, 2019, 8:07 PM

#

For the client but your server still handles all the actors.

winged badger Oct 6, 2019, 8:07 PM

#

and it has to evaluate all of them that aren't in inactive repgraph buckets or dormant

gritty pelican Oct 6, 2019, 8:07 PM

#

to all, replication occurs only when something changes in the object

winged badger Oct 6, 2019, 8:08 PM

#

for each of your 50 clients separately

gritty pelican Oct 6, 2019, 8:08 PM

#

I tested my world 6 by 6 km. And received a stable ping of 20ms. with about 30 players

winged badger Oct 6, 2019, 8:08 PM

#

10k actors is still managable, don't get me wrong

#

that number does tend to grow

gritty pelican Oct 6, 2019, 8:09 PM

#

95% of my actors are motionless

#

Only hostile bots and players are mobile

winged badger Oct 6, 2019, 8:10 PM

#

how many of those bots do you have

#

and are they using CMC?

gritty pelican Oct 6, 2019, 8:10 PM

#

The problem is that I would like to make some other system for AI. But I have no idea how to do this.

#

while they were tested there were about 100

#

possibly less, since they appeared only if the player entered the bot area

silent birch Oct 6, 2019, 9:08 PM

#

I can not do that when a player's life is at zero it destroys it just works at the server not at the customer's

red musk Oct 6, 2019, 11:23 PM

#

Hello everyone, if I am using Level Streaming with the Streaming Method set to Blueprint, multiple clients run through PIE will no longer correctly auto connect / spawn their pawn to my dedicated server - only client 1 works correctly

#

Anyone know why that would be?

#

The level set to Blueprint load has no logic in its level blueprint, and is just some random environment objects

winged badger Oct 6, 2019, 11:31 PM

#

and it works just fine with AlwaysLoaded?

red musk Oct 6, 2019, 11:32 PM

#

Yeah

#

Always loaded works fine

winged badger Oct 6, 2019, 11:41 PM

#

will no longer correctly auto connect / spawn their pawn to my dedicated server

#

you'll need to elaborate a little

red musk Oct 6, 2019, 11:43 PM

#

I figured it out, was a stupid error on my part, all of the various levels I tried switching to blueprint had spawn points on them, so I was effectively turning off spawn points from existing immediately.

My default pawn was set to not spawn if it fails to adjust location, since they were all spawning on top with collision, subsequent pawns failed to be created

#

Changing the spawn collision handling method on my base pawn to Try To Adjust Location, But Always Spawn has fixed my issue

#

Sorry for the waste of time! 🙃

winged badger Oct 6, 2019, 11:48 PM

#

you should really have PlayerStarts on PersistentLevel

woven grove Oct 7, 2019, 3:12 AM

#

Hey guys

#

Anybody have solid recommendations, or is there a general consensus on which database software is best/easiest to use for indies developing a game with login server functionality?

#

Persistence including coordinates/mapdata and statistics etc.

#

Is MySQL through HTTPS -> UE4 the best way to go here?

tropic snow Oct 7, 2019, 5:20 AM

#

Anyone know how to get this replicate well?

#

📎 unknown.png

#

looks smooth on server, client is a bit clitchy

mighty rover Oct 7, 2019, 6:56 AM

#

quick question: from a custom PlayerState, why do these two nodes return something different? Is it because from GetPlayercontroller -> PlayerState, since it's replicated and hasn't been replicated down yet, or...?

📎 unknown.png

fossil spoke Oct 7, 2019, 6:58 AM

#

PlayerArray is an array of all PlayerStates, it is not an ordered array.

#

PlayerIndex0's PlayerState can be in an arbitrary location of the PlayerArray.

#

Also yes you will have to contend with Replication as well

mighty rover Oct 7, 2019, 7:11 AM

#

@fossil spoke thanks

supple musk Oct 7, 2019, 9:00 AM

#

Hello guys quick question,
If I use the cmd "open IPADRESS:PORT" and the travel fails, my game default map is loaded. How can I choose to stay on my actual map instead of going to game default map ?

velvet parcel Oct 7, 2019, 9:24 AM

#

If I run a server RPC on the server what does it do exactly? Is it basically like running a non replicated RPC?

lapis breach Oct 7, 2019, 9:31 AM

#

i think it will drop the call

#

as far as i can see server will run multicast and run on owning client only

#

same with client, if they are told to call anything apart from run on server it will drop the call

#

@velvet parcel

supple musk Oct 7, 2019, 9:34 AM

#

Server RPC on Server just runs like a normal function call would

#

https://docs.unrealengine.com/en-US/Gameplay/Networking/Actors/RPCs/index.html

RPCs

Designating function replication across the network

#

look at the two tables on this page

velvet parcel Oct 7, 2019, 10:28 AM

#

@supple musk Thanks that is kind of what I was thinking it would do.

#

But I wasnt sure

compact osprey Oct 7, 2019, 7:04 PM

#

Hi , my client doesn't have good tranform... is it because i don't set transform replicates in tick from the server ?

📎 Screenshot_8.png

light obsidian Oct 7, 2019, 7:24 PM

#

do you have replicate movement ticked? @compact osprey

📎 unknown.png

steep jay Oct 7, 2019, 7:24 PM

#

Can somebody explain RPC replication to me? I watched all of the Blueprint Multiplayer videos and a lot of tutorials on youtube, but I still don't understand it.

light obsidian Oct 7, 2019, 7:26 PM

#

you can tick that in the actor class defaults

compact osprey Oct 7, 2019, 7:31 PM

#

Yes @light obsidian

#

📎 Screenshot_10.png

light obsidian Oct 7, 2019, 7:34 PM

#

the balls?

#

i assume that's what not replicating

compact osprey Oct 7, 2019, 7:34 PM

#

My golf ball BP is a pawn

light obsidian Oct 7, 2019, 7:34 PM

#

alright

#

is there any other logic that might leave them out of sync?

#

like freezing positions but not doing that server side on accident

compact osprey Oct 7, 2019, 7:35 PM

#

yes , to move my golfball I set linear velocity

#

server works perfectly

light obsidian Oct 7, 2019, 7:36 PM

#

do you run that on the server

compact osprey Oct 7, 2019, 7:36 PM

#

but Client move a little bit and get teleported at his spawn transform

grand kestrel Oct 7, 2019, 7:36 PM

#

@steep jay Check out the networking compendium that cedric exi wrote, he has it pinned to this channel

compact osprey Oct 7, 2019, 7:37 PM

#

set physics linear velocity ?

light obsidian Oct 7, 2019, 7:37 PM

#

so you move the client but it warps back to where it was?

compact osprey Oct 7, 2019, 7:37 PM

#

yes

steep jay Oct 7, 2019, 7:37 PM

#

Wow, 100 pages, thanks for the resource!

light obsidian Oct 7, 2019, 7:37 PM

#

sounds like you're not changing the velocity through the server

grand kestrel Oct 7, 2019, 7:37 PM

#

@steep jay Almost everyone who learns networking starts there, it's the best resource

light obsidian Oct 7, 2019, 7:37 PM

#

so the client corrects its position to match

compact osprey Oct 7, 2019, 7:37 PM

#

📎 Screenshot_11.png

#

yes but why my server has not the good position at the beginning ?

grand kestrel Oct 7, 2019, 7:39 PM

#

@compact osprey @light obsidian What happens is this, if you have 50ms latency:

Client moves, tells server to move
50ms later server moves
Server replicates result 50ms later, which is 50ms in the past, and snaps the client to where the server was
...Repeat

#

That's why client-side prediction exists, so they make the same moves, locally, and the client is only corrected if there's ever a mismatch, which should never occur without interaction between two different remotely controlled entities

compact osprey Oct 7, 2019, 7:39 PM

#

@grand kestrel thank you

grand kestrel Oct 7, 2019, 7:40 PM

#

Currently UE4 only has built-in client-side prediction for characters via CharacterMovementComponent and ACharacter

compact osprey Oct 7, 2019, 7:40 PM

#

for the first problem I need to change latency ?

grand kestrel Oct 7, 2019, 7:40 PM

#

Nope

#

You will either need to write client-side prediction or find a way to use CMC to do what you're attempting

#

Due to UE4 physics being non-deterministic you will be hard pressed to write prediction for physics

#

Because errors to the 7th digit of precision in a transform can result in wildly different deflection vectors during collisions, which is why we still don't have properly predicted vehicles

#

Both options are quite far out of the reach of a beginner developer, unfortunately

#

Epic has started making a modular/expandable prediction plugin, but its a fair way off, and wont be too beginner friendly itself I think - however they will likely use it themselves to make all their templated player actors predicted (such as rolling ball)

#

The alternative is to have client-authoritative movement

#

So long as its not a competitive game, you can get away with it

#

So the client simply tells the server "I'm here" and the server tells everyone else the same

compact osprey Oct 7, 2019, 7:44 PM

#

thank you for your answer @grand kestrel i'll try it

#

in tick you say this ?

grand kestrel Oct 7, 2019, 7:45 PM

#

@compact osprey For starters, process all movement locally only, then afterward, send the resulting transform to the server in an unreliable RPC, and have it 'set world transform' from the RPC, then simply check 'replicates movement' and hopefully that will get you started

#

Oh, actually just send location and rotation unless you need scale

#

It might also be worth rounding the location vector to 1 digit

#

Just so you're sending less data

#

You can compress the rotation into bytes too if you like

#

Some would argue this is premature optimization though 🤷

compact osprey Oct 7, 2019, 7:49 PM

#

it's only a prototype game so isn't a competitive 🙂

#

i'll try this , thank you

grand kestrel Oct 7, 2019, 7:50 PM

#

That makes it easy then 🙂

fiery geyser Oct 7, 2019, 8:43 PM

#

Hei, i need a bit of your thoughts on a system that i'am pioneering for our game, now a bit of description about it, is a fast paced third person shooter in an arena style game. The new mechanic we are trying to introduce is: there are some actors in the game where the players can interact with them, they can translate/rotate mostly on one axis back and forth (this happens on the server on some sort of timer and is replicated to the clients), we have a pretty solid custom replication component that handles interpolation/extrapolation on them using all kinds of compression tricks to reduce the network load. However, too many of them and is a bit too heavy for our component to handle leading to jaggering movement/teleportation all that, but our lead designer needs them. Any thoughts on how could we optimize that? (I know the answer is kind a broad, but anything might lead us to a better way of dealing things) I am just looking for new perspectives.

grand kestrel Oct 7, 2019, 9:53 PM

#

That is way too vague, you should be using the net/etc profiling tools and finding out whats really going on

winged badger Oct 7, 2019, 10:00 PM

#

what are you replicating for that component, and how many of them are on the level @fiery geyser ?

astral fossil Oct 7, 2019, 10:03 PM

#

Hey, I have a quick question:
Is there anything that makes RepNotify NOT be replicated in all instances?
I'm having this situation in which in one map, all instances receive notification and in another map, only server and local actors receive it

#

replication condition is set to None

winged badger Oct 7, 2019, 10:04 PM

#

BP?

astral fossil Oct 7, 2019, 10:04 PM

#

uhum,

winged badger Oct 7, 2019, 10:04 PM

#

it will trigger whenever the RepNotify variable is set

#

even when set locally

#

as for not receiving RepNotifies

astral fossil Oct 7, 2019, 10:05 PM

#

it should right? I never seen that issue before

winged badger Oct 7, 2019, 10:05 PM

#

being out of NetRelevancy (range) you won't get a replicated variable, and so no RepNotify

astral fossil Oct 7, 2019, 10:06 PM

#

hmmmm gonna investigate that, thanks!

winged badger Oct 7, 2019, 10:06 PM

#

i asked if it was BP because c++ behaves differently

#

there only clients get OnReps called

astral fossil Oct 7, 2019, 10:06 PM

#

hmm

winged badger Oct 7, 2019, 10:06 PM

#

and they don't get called except as a replication callback

astral fossil Oct 7, 2019, 10:07 PM

#

good to know also

#

damn, even with Always Relevant set it still happens. Don't know how to replicate the problem in isolated environment

winged badger Oct 7, 2019, 10:10 PM

#

be very specefic then\

#

because i only have a vague idea of what the problem is

astral fossil Oct 7, 2019, 10:11 PM

#

ok

#

I'm having this issue in one actor only. It's spawned by the pawn (on server, to a replicated variable).
I want to set this actor mesh on runtime, and for that I need to get info saved on the local Game instance (where the player selected options are stored)
So, on this actor I get its owner and do this:

📎 unknown.png

#

so, the actor's Server instance will receive Pawn Assets and wil apply to the variable, which should be replicated on all instances

#

and it does, on another map that I tried

winged badger Oct 7, 2019, 10:18 PM

#

where does that run from? BeginPlay?

astral fossil Oct 7, 2019, 10:18 PM

#

yes

winged badger Oct 7, 2019, 10:19 PM

#

but it never sets?

#

the variable on server

astral fossil Oct 7, 2019, 10:19 PM

#

sets

#

im testing with 2 clients and dedicated server:

Server actor: notifies
Client1 actor (ORIGINAL): notifies
Client1 actor (replic) : NOPE
Client2 actor (ORIGINAL) : notifies
Client2 actor (replic): NOPE

winged badger Oct 7, 2019, 10:22 PM

#

do those prints happen before BeginPlay?

astral fossil Oct 7, 2019, 10:22 PM

#

is this understandable?

#

no

winged badger Oct 7, 2019, 10:22 PM

#

on clients

astral fossil Oct 7, 2019, 10:22 PM

#

I also experimented with some huge delays to be sure everything was already spawned

#

the weird thing is that (besides this working in another map) I'm doing this same process in the pawn, to set its meshes, and in it all notifies are triggered

winged badger Oct 7, 2019, 10:25 PM

#

when does it print NOPE?

astral fossil Oct 7, 2019, 10:25 PM

#

it doesn't print

#

hahah sorry should have expressed diferently

#

only those with 'notifies' trigger the OnRep_ function

#

OH

#

sorry, tried with a bigger delay and it worked... its still weird

winged badger Oct 7, 2019, 10:32 PM

#

how many replicated Actors?

astral fossil Oct 7, 2019, 10:32 PM

#

its 2 clients, each one having its 'own' actor and a replication of this actor in the other client

winged badger Oct 7, 2019, 10:33 PM

#

total on map?

#

i suspect that if you crank up its NetPriority to 4, and remove the Delays it will work just fine

astral fossil Oct 7, 2019, 10:34 PM

#

oh you mean all actors?

#

hmm

#

gonna try

#

net priority was set to 3., now on 4 it worked once without delay

#

I use to thought that repNotifies would make sure to notify even yet to be spawned actors

#

I already had problems with multicast for this reason (trying to execute something before spawn) and the proposed solution was to use repnotify

winged badger Oct 7, 2019, 10:40 PM

#

NetPriority can fail if a packet with that actor is lost

#

doesn't happen all that often

#

but its not a foolproof solve

astral fossil Oct 7, 2019, 10:41 PM

#

its weird cause i'm now messing with a lot of actors now, and I'm testing all on my machine

winged badger Oct 7, 2019, 10:43 PM

#

i figured, NetPriority change only makes a difference when you start hitting bandwidth caps during initial load

astral fossil Oct 7, 2019, 10:46 PM

#

hmm, thank you very much for your help man =)!

#

one thing, is that the best way to know if an actor is "locally controlled" (i know this is specific for pawns)

winged badger Oct 7, 2019, 10:49 PM

#

does c++ function work for you?

astral fossil Oct 7, 2019, 10:50 PM

#

I'm working with BP in this case, but sure, better to know

winged badger Oct 7, 2019, 10:50 PM

#

bool USolsticeObjectLibrary::IsLocallyControlled(AActor* ActorToQuery)
{
    if (!ensure(ActorToQuery))
    {
        return false;
    }

    AActor* TopOwner = NULL;

    for (TopOwner = ActorToQuery; TopOwner->GetOwner(); TopOwner = TopOwner->GetOwner()) { }

    APlayerController* controller = Cast<APlayerController>(TopOwner);
    return controller && controller->IsLocalPlayerController();
}

astral fossil Oct 7, 2019, 10:51 PM

#

Awesome ! Thanks again 🙂

winged badger Oct 7, 2019, 10:54 PM

#

i made that thing static and BlueprintCallable

#

very convenient

tropic snow Oct 7, 2019, 10:57 PM

#

Everything works but the client mesh yaw does not rotate. Anyone know why?

📎 unknown.png

somber glade Oct 8, 2019, 12:24 AM

#

How do actor visuals work in a multiplayer environment when you do something like say change the color of something, and a player joins after that color has been changed? Let's say we have a cube that is black when the game starts. At some point a player pushes a button that turns it red. Normally that red color would be set on each client with a rep notify. If we only change it with a rep notify, would a player joining after that happens see it as red or the original black? Should we also run separate code for the server to change the color on its end? I'm just trying to make sure I have a grip on how rep notify works. As far as I understand it right now, when the server sets something with a rep notify, and you run code in that rep notify, that code doesn't run on the server right?

wraith wasp Oct 8, 2019, 1:13 AM

#

as far as i understand it (also still learning), repnotify is called only on already connect clients. if you need to share state like a changed color it should be a replicated variable

#

@somber glade

somber glade Oct 8, 2019, 1:13 AM

#

Thanks!

wraith wasp Oct 8, 2019, 1:13 AM

#

also keep in mind that server is a bit ambiguous

#

there is a dedicated server and a listen server

#

listen server is both, the server and a client

#

so client code will also run on that kind of server

wraith wasp Oct 8, 2019, 1:41 AM

#

this might be of interest to your question
https://docs.unrealengine.com/en-US/Resources/ContentExamples/Networking/index.html#relevancy

@somber glade

Networking Content Examples

Overview of the samples provided in the Network Features Content Example map.

somber glade Oct 8, 2019, 1:44 AM

#

@wraith wasp Thank you, I'll check that out.

gray scroll Oct 8, 2019, 2:25 AM

#

I am trying to rep notify team name so everyone including late joiners can see the players updated skins depending on team but for some reason... the later joiners cant see the right player skin... any idea why?

wraith wasp Oct 8, 2019, 2:32 AM

#

SetPlayerTeam is run on server and at the end it calls a server rpc. I'm not sure this will work. server RPCs should only be called on clients. i think a fix might be to not replicate this event at all since you already receive the change on clients via repnotify

#

@gray scroll

#

with "this event" i meant "SetTeam"

gray scroll Oct 8, 2019, 2:43 AM

#

@wraith wasp so don't replicate SetTeam?

wraith wasp Oct 8, 2019, 2:46 AM

#

that's my guess

#

it should set the replicated var on the server and also update and trigger replication on clients

gray scroll Oct 8, 2019, 2:49 AM

#

I will try it... but don't think it would be the reason

main spindle Oct 8, 2019, 5:56 AM

#

Anyone know of a good workaround to the fact that you can't replicate maps?

#

As in map variables

#

In blueprints

velvet parcel Oct 8, 2019, 7:17 AM

#

is there a way to increase how much data can be transferred over the network when using a multicast or rep notify?

bitter oriole Oct 8, 2019, 7:38 AM

#

There is

#

Though it's a bit more subtle than that

#

IIRC it's a bandwidth limit, not a size limit

fleet raven Oct 8, 2019, 7:38 AM

#

there are several limits

#

it will refuse to serialize arrays over a few KB, there is a max size on multi-part bunches, and there are multiple bandwidth limits

bitter oriole Oct 8, 2019, 7:41 AM

#

I thought usually the bandwidth one kicks in quite quickly

fleet raven Oct 8, 2019, 7:41 AM

#

yeah, the default is ridiculous, only 10kbps

#

(or was it KB/s?)

bitter oriole Oct 8, 2019, 7:42 AM

#

Pretty sure it's kbps

fleet raven Oct 8, 2019, 7:43 AM

#

ideally you could just remove the limit

#

but the protocol behaves very dumb then

#

it'll happily send barrages of packets at 30% loss if you queue too much

#

br_egg

void nest Oct 8, 2019, 11:47 AM

#

Hello guys. I'm trying to optimise the movement replication of a ship in my game. Currently all movement is set serverside, the server then sends the transform using an multicast. This is done with a 0.1 second delay and a doonce. This works well, but sometimes on slower internet connection if one multicast is skipped it is very noticeable. Making the delay smaller will be too much I think and flood the bandwith. So I was thinking of instead of using a multicast, setting the transform to replicated and just let the server update it on tick. Question is, how optimised is this? I've read that UE then decides itself how often the transform variables is updated. But I'd like to hear some specifics on how optimised exactly it is compared to a multicast?

#

the ship is a boat on bobbing water, so the transform will in fact be different every single tick

#

making me think that the server will push new transform data every single tick. And everything inside of my head tells me this will be bad 😛

#

but somehow people say i should be optimised

#

hence my confusion

#

but.... what if I set the variable on server and still use the doonce and 0.1 second delay?

#

would that be more reliable than the multicast which is not set to reliable

earnest igloo Oct 8, 2019, 11:56 AM

#

@void nest Check the pinned items for a video called "Overwatch Gameplay Architecture and Netcode" It gives a good overview of some of the sorts of techniques that will probably help you

bitter oriole Oct 8, 2019, 11:56 AM

#

This should absolutely be done with a replicated variable

#

And yes, replication optimizes itself

void nest Oct 8, 2019, 11:57 AM

#

is there any documentation about this?

bitter oriole Oct 8, 2019, 11:57 AM

#

It's not going to replicate at 60fps in most conditions

#

Pinned post

void nest Oct 8, 2019, 11:57 AM

#

even if the variables is different every tick?

bitter oriole Oct 8, 2019, 11:57 AM

#

Yes

#

By the way, you'll still need smoothing in the end

earnest igloo Oct 8, 2019, 11:58 AM

#

^^

bitter oriole Oct 8, 2019, 11:58 AM

#

You need to update movement every tick on remote clients, but you won't get replication update every tick

#

So you'll need interpolation

void nest Oct 8, 2019, 11:59 AM

#

yes i already have a very complicated smoothing system 😛

#

it's just that when the replication gets skipped (using the multicast) the ship smoothly interpolates to the next updated location, but even when smoothed it still looks like a strange inconsistency in the speed

#

i want the ships to move extremely smooth and as close to the server original transform as possible

#

all the while keeping it somewhat optimised

bitter oriole Oct 8, 2019, 12:00 PM

#

Inconsistencies in speed might be an interpolation issue

#

You're not using linear right ?

void nest Oct 8, 2019, 12:00 PM

#

the ships are boats that players walk on in first person, so any small hickup is very noticeable

earnest igloo Oct 8, 2019, 12:01 PM

#

Is the movement deterministic? Could the client make a reasonable prediction on where the ship should end up by running the same movement code as the server?

#

(by which I mean the same bobbing calculations)

void nest Oct 8, 2019, 12:01 PM

#

no not really, beause the ships are buoyancy calculated, all of the buoyancy calculations happen serverside, as the clients can not calculate their own buoyancy locally and then end up with the ship being on different rotation on different clients

#

all clients must get 100% accurate transform that is equal on each client

bitter oriole Oct 8, 2019, 12:02 PM

#

This isn't going to happen really

void nest Oct 8, 2019, 12:02 PM

#

the current system works perfectly, except for the hickups on slow internets

#

but I'll try with the replicated variable and see what that gives

bitter oriole Oct 8, 2019, 12:03 PM

#

You'll always have to allow some leeway between players

earnest igloo Oct 8, 2019, 12:03 PM

#

I don't mean that you would detach the client calculation from the server - the server position would still be authoritative - but buoyancy doesn't seem like a completely unrealistic thing for the client to have a go at calculating for a tick or two until the next update comes in

void nest Oct 8, 2019, 12:04 PM

#

https://i.gyazo.com/c79bbba68b05bfc695979c73e5100bba.png

#

this is the interpolation I'm using currently

#

what do you mean with linear?

#

do you mean interp to constant?

#

if yes, no I do not use that

#

i use the rinterp nodes which by my knowledge have a smooth in and out, no?

#

and vinterp*

#

don't mind the interpolation speeds, those are for different wave settings

#

@earnest igloo Yeah that is definitely a possibility

#

a clientside calculation that gets corrected with the server's replication anytime it can, if the server fails to replicate, the client's own calculation get's used as a placeholder / backup

#

could work

earnest igloo Oct 8, 2019, 12:09 PM

#

Yeah I think that could probably be good. Wave motion sounds like it should have a good degree of determinism to allow it

void nest Oct 8, 2019, 12:09 PM

#

but that would only fix the buoyancy though, the problem is less the buoyancy and more the actual y/x location

earnest igloo Oct 8, 2019, 12:09 PM

#

Ah ok

void nest Oct 8, 2019, 12:09 PM

#

which is harder for the client to predict, as that would mean clients would have control over the direction and speed

earnest igloo Oct 8, 2019, 12:09 PM

#

Does the boat look "skatey" when you skip an update?

void nest Oct 8, 2019, 12:10 PM

#

it looks like the ship is slowing down / standing still for a fraction and then it catches up to the new update

earnest igloo Oct 8, 2019, 12:10 PM

#

Ah you run out of interp buffer? You just keep the one sample around right?

void nest Oct 8, 2019, 12:10 PM

#

yeah basically

#

the interpolation on the YX happens quite fast, as I can't slow that down too much or there is an offset between the server's location and the client's location, which causes collision issues as collisions are also calculated serverside

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basically the ship than stops from a collision while on the client it still apears a distance away from said collision

earnest igloo Oct 8, 2019, 12:12 PM

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You could do the same prediction thing... on the client presume that the server will probably agree with you on the effect of your control inputs and movement calcs, and put your ship in the "right" place on the client without consulting the server. You would only notice a correction if the server gets back to you and disagrees, which is unlikely if the ship is mostly on its own

void nest Oct 8, 2019, 12:13 PM

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yeah true, also what I was thinking

earnest igloo Oct 8, 2019, 12:13 PM

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Again the server remains authoritative but the client can guess in the mean time

void nest Oct 8, 2019, 12:13 PM

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would be a bit of work to implement, but if the issue still persist after the changes I just made, I will look into something like that

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thanks a lot for the help!

earnest igloo Oct 8, 2019, 12:13 PM

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Yeah it would be - depends how important it is to you have have this seem responsive

void nest Oct 8, 2019, 12:14 PM

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it's actually really important, as the ships are the main mechanic in the game. Hence why i want the experience on them as smooth as possible

earnest igloo Oct 8, 2019, 12:14 PM

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Also, if you have time I'd highly recommend having a watch of this https://www.youtube.com/watch?v=W3aieHjyNvw It's not UE4 but there are some great explanations of techniques in there

YouTube

GDC

Overwatch Gameplay Architecture and Netcode

In this 2017 GDC session, Blizzard's Timothy Ford explains how Overwatch uses the Entity Component System (ECS) architecture to create a rich variety of laye...

▶ Play video

void nest Oct 8, 2019, 12:14 PM

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I've seen that video pass by a while ago, watched a small part. Will definitely watch it in full soon!

earnest igloo Oct 8, 2019, 12:16 PM

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There's a big chunk of stuff on ECS which is probably less relevant. Around 22 minutes in there's a good section on what they did with netcode though

earnest igloo Oct 8, 2019, 12:34 PM

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@void nest Hey just thinking about your blueprint screenshot. It looks like you don't do any extrapolation, correct? So if Current is the same as Target then the velocity of the ship will drop to zero. I figure ships turn kinda slowly, so you might find that a simple linear extrapolation does a world of good. Do you replicate velocity? If you do, you'd just calculate a predicted target (so replicated target + velocity * time) if you reached your replicated Target before the next update from the server came in

void nest Oct 8, 2019, 12:37 PM

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Yeah that happens when the server fails to replicate the rotation or the replication is delayed by ping. The client will already have reached the previously replicated rotation making it so that the client has to wait until the next replication comes through upon which he sudenly interpolates to the next rotation, which suddenly gets sped up as the target rotation is much bigger than usual.

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Currently there is no clientside prediction what so ever. But with a bit of work I can add it.

earnest igloo Oct 8, 2019, 12:37 PM

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Ok yep cool

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Sounds like you're on the right track

void nest Oct 8, 2019, 12:38 PM

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Thanks again for you input 😉

earnest igloo Oct 8, 2019, 12:38 PM

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You're very welcome 🙂

amber ore Oct 8, 2019, 12:52 PM

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@pallid mesa "had to do PR for 4.23 due to a net culling issue with posessions and late joiners XD"
I think I'm having the exact same issue. Can you tell me which PR it is?

slow bronze Oct 8, 2019, 12:56 PM

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Hello everyone. I have a question regarding fast TArray replication. It's explicitly said that inside functions like PreReplicatedRemove(), that the indices are only valid inside those functions.

I dig a big into the replication code and I think it's only valid here because deletion of items is performed later and is made using the swap and remove idiom.

So the question is : Is there a way to get the indices of modified items as they would be after the deserialization ?

compact osprey Oct 8, 2019, 1:01 PM

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Hi , Does anyone can explain me how can I fix this client transform Problem with my ball ?

📎 Screenshot_13.png

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https://youtu.be/gmUrXZVMG-o

YouTube

MDMTTS

Desktop 2019 10 08 14 54 54 01

▶ Play video

slow bronze Oct 8, 2019, 1:05 PM

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@compact osprey If ReplicateMovement is checked, the position of you actor will already by replicated. I think you don't really need this code.

compact osprey Oct 8, 2019, 1:07 PM

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to move my ball i use set physics linear velocity and if i don't use this code balls are like that

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📎 Screenshot_14.png

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If i call set Position On server just after Set physic linear velocity , the problem is " fixed" but I want to do it with the best way

slow bronze Oct 8, 2019, 2:03 PM

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@compact osprey Make sure your staticMeshComponent is set to replicate. I just tested it. Calling SetPhysicsLinearVelocity on server worked for me.

compact osprey Oct 8, 2019, 2:21 PM

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@slow bronze

📎 Screenshot_15.png

slow bronze Oct 8, 2019, 2:26 PM

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Is ReplicateComponent checked ?

compact osprey Oct 8, 2019, 2:27 PM

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Oops i thought it was on the screen ... Yes it is

slow bronze Oct 8, 2019, 2:45 PM

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This is what I get

📎 2019-10-08_16-43-55.mp4

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📎 unknown.png

compact osprey Oct 8, 2019, 2:46 PM

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I Check to my side

slow bronze Oct 8, 2019, 2:46 PM

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📎 unknown.png

compact osprey Oct 8, 2019, 2:52 PM

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📎 Screenshot_16.png

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📎 Desktop_2019.10.08_-_16.53.39.02.mp4

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if i call set position on server

thin stratus Oct 8, 2019, 3:02 PM

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Both of you are using Physics and Multiplayer, right?

compact osprey Oct 8, 2019, 3:02 PM

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yes

thin stratus Oct 8, 2019, 3:02 PM

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@compact osprey @slow bronze

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Yeah, both if you have to be aware of this not being something you usually replicate.

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Simulated Physics + Multiplayer (specially in UE4) is a nightmare and basically not doable.
You can get a semi-working solution where you let the Server simulate physics and replicate the location adn rotation to the client.
That only works for actors that the client doesn't control though

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What you see in the last video Melvin posted is one of the issues you need to actively code a solution for

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And with physics that's not really a thing

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You'd need to save the local moves and replay them when updates from the server come in

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Currently you can see that he's not doing that and the server, caused by ping, overrides the client location

compact osprey Oct 8, 2019, 3:04 PM

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📎 Desktop_2019.10.08_-_16.59.17.03.mp4

thin stratus Oct 8, 2019, 3:04 PM

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So you constantly get kicked back

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Correct, that works until you actively add ping to it

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If only the server simultes it, the player shooting the ball will always be delayed, cause the whole thing has to travel to the server and back first

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So not responsive at all

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Simulating it on the client first needs you to save the move and replay it when the server sends the update a few ms later.

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The CMC from the Character does all of that

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Epic is working on a more generic prediction system but atm only the CMC really has a solution for this

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And that does not include simulated physics either way

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CMC calculates the physcis via normal vector math and moves the actor by hand

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(CMC being the CharacterMovementComponent)

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If you can live with lags or with the shot delay, then you can go for a server authoritive solution

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The other solution to this would be not letting the server simulated the physics at all

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Then you would be client authoritive, client simulates the physics, tells server the location and server tells it to everyone else

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That still misses interpolation though (in case ping is high or packages are droped)

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And client authoritive obviously allows cheating, which for some is a problem too

compact osprey Oct 8, 2019, 3:11 PM

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ok, in my case , what i made is it fine ? I'm currently working with your pdf to understand all things

thin stratus Oct 8, 2019, 3:11 PM

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You are simulating it on the server as far as I can see

compact osprey Oct 8, 2019, 3:12 PM

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yes

thin stratus Oct 8, 2019, 3:12 PM

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That would cause set backs if you let the server replicate the movement back to the local client

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Or the shot delay if not

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Test it by enabling package delay in the editor

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https://www.unrealengine.com/en-US/blog/finding-network-based-exploits

Unreal Engine

Finding Network Based Exploits

Recently, I had an email conversation with a Gears of War fan about the differences in networking quality between each of the three games in the series. One thing that we can point to in terms of increasing the quality of the networking experience is our use of the Unreal Eng...

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That should have some console commands for that

slow bronze Oct 8, 2019, 3:13 PM

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I'm aware of that. I just made this little demo quickly to show Melvin a simple setup ^^.

thin stratus Oct 8, 2019, 3:13 PM

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Right, I didn't get that out of the short convo I saw

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Thought you are both struggling with similar issues

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Either way, it's not something one can easily solve.

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Either you live with the drawbacks from simulating physics and understand that a client authoritive solution might be the best (and allows cheating).
Or you go the extra step of making a custom C++ movementComponent that takes care of doing all the "physics" via vector math and calculating the location and rotation yourself

compact osprey Oct 8, 2019, 3:18 PM

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So, I should test my code with Package delay enabled to see how it"s work right ?

thin stratus Oct 8, 2019, 3:19 PM

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That would show you if you have any problems related to higher pings

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As PIE testing might be a more or less 0ping experience

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which is pretty unlikely to ever be a thing :D

compact osprey Oct 8, 2019, 3:20 PM

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for the moment no problems related with 500 pings ... 🤔

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Net pktlag = 500 and NetPktLess= 50

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📎 Desktop_2019.10.08_-_17.22.30.04.mp4

thin stratus Oct 8, 2019, 3:28 PM

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Not 100% sure how you are doing it atm. It must have a draw back somewhere. :D

compact osprey Oct 8, 2019, 3:29 PM

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when i use thoses command Net pktlag = 500 and NetPktLess= 50 ?

thin stratus Oct 8, 2019, 3:29 PM

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That's pretty high numbers though yeah

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Ah you can clearly see the lag though

compact osprey Oct 8, 2019, 3:30 PM

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yes haha

thin stratus Oct 8, 2019, 3:30 PM

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So that's the solution where the server simulates and the client just waits for the update

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The higher the ping, the greater the delay

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you have no interpolation, so if there are package drops, you will see the ball jump

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Obviously different per game

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But that's the general case

compact osprey Oct 8, 2019, 3:33 PM

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Ok , i note this in my mind

unique kelp Oct 8, 2019, 3:52 PM

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Are there any special considerations, (besides transforming vectors/positions in my RPCs) when changing clients' world origin locations? I'm currently seeing some weirdness with Landscape LODs and some missed inputs in the movement component right around when the rebasing kicks in

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Stuff like sprint sticking to on/off or jumps not triggering even though they go through the right flow in the character code

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work day's over, so sorry If I dont reply for a bit, but any kind of help is greatly appreciated

grand kestrel Oct 8, 2019, 9:32 PM

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@thin stratus Do you know if there's any drawback to expecting AI to have player states?

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Coz the equipment plugin I'm making uses the player state for the container and as owner, thinking about making it support pawn for the sake of AI

jolly siren Oct 8, 2019, 9:34 PM

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None that I have seen, other than an extra actor per AI

grand kestrel Oct 8, 2019, 9:34 PM

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Hmm

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I built it with the possibility in mind from the start so shouldn't be too hard, guess I'll try adding it once I've more or less finished the plugin, so long as there's no major hiccups then it'll just be a bonus that they don't need player states

fleet raven Oct 8, 2019, 10:28 PM

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does anyone have much experience with the replication graph? I'm wondering if it heavily relies on actors for relevancy/priorization or if it would be able to manage this for individual components within a huge actor

polar lotus Oct 9, 2019, 12:01 AM

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Hey guys, If I have a game that supports dedicated AND listen servers, what kind of replication would I do for a gun firing in a character blueprint since my gun is part of the character

dark edge Oct 9, 2019, 12:22 AM

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Yo is ControlRotation replicated?

polar lotus Oct 9, 2019, 12:25 AM

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?

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@fleet raven could you help

dark edge Oct 9, 2019, 12:31 AM

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@polar lotus What do you mean by it's "part of the character"?

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Is the gun an Actor?

polar lotus Oct 9, 2019, 12:32 AM

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no

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my characters skelmesh has a gun

dark edge Oct 9, 2019, 12:32 AM

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So Character is what spawns the bullets or does the raycasts?

polar lotus Oct 9, 2019, 12:32 AM

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The gun islinetrace based

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All gun stuff is in character

dark edge Oct 9, 2019, 12:33 AM

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It'll depend on your lag compensation technique but just doing the trace and damage on server should get you going

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just do it on the authority and you should be good

tropic snow Oct 9, 2019, 12:33 AM

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Why is this happening to the client

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https://gyazo.com/bac2505af57ebba858cfe14e97778302

Gyazo

▶ Play video

dark edge Oct 9, 2019, 12:34 AM

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You'll need to translate the fire input into an RPC to server

polar lotus Oct 9, 2019, 12:34 AM

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In to an RPC?

dark edge Oct 9, 2019, 12:34 AM

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@tropic snow You simulating lag or no?

tropic snow Oct 9, 2019, 12:34 AM

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How do I check? Client seems like his lagging

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This is the bp

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📎 fetch.png

polar lotus Oct 9, 2019, 12:35 AM

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Right now I have a character and child classes with different skelmesh and my character casts to itself as the hit actor

dark edge Oct 9, 2019, 12:36 AM

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@polar lotus This is the bare minimum. You'll want to do some stuff client side so you don't gotta wait for a round trip before you see your character fire on your own screen.

📎 unknown.png

tropic snow Oct 9, 2019, 12:37 AM

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I replicated the variables but made it so the server runs it with an Auth

polar lotus Oct 9, 2019, 12:38 AM

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Right now when I click it does nothing with that stuff

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The only way for everyone to see it is to make it run on server and then multicast

dark edge Oct 9, 2019, 12:39 AM

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Well yeah, you need to replicate the results at a minimum.

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@tropic snow Why aren't you just using pawn control rotation?

polar lotus Oct 9, 2019, 12:40 AM

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rn i have this

📎 unknown.png

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sorry meant this

dark edge Oct 9, 2019, 12:41 AM

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@polar lotus You're just boincing to the server and back. The server is never firing.

polar lotus Oct 9, 2019, 12:41 AM

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📎 unknown.png

dark edge Oct 9, 2019, 12:41 AM

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That should work

polar lotus Oct 9, 2019, 12:41 AM

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ok

tropic snow Oct 9, 2019, 12:41 AM

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I shouldn't be?

dark edge Oct 9, 2019, 12:41 AM

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If you set your stuff up right you shouldn't have to change anything when playing single player, listen server, or dedicated

tropic snow Oct 9, 2019, 12:42 AM

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I followed a tutorial for turn in place.

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with aim offset

dark edge Oct 9, 2019, 12:43 AM

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@tropic snow Everything with the arms/aim should be derived locally from the control rotation. It looks like you're replicating the rotation from server to owning client somehow which will be really really bad

tropic snow Oct 9, 2019, 12:44 AM

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I see. I started off as third person thats why

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i just moved the camera

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to the face now to start working on fps

dark edge Oct 9, 2019, 12:44 AM

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just make sure your aim offset is being driven by the control rotation or some other locally calculated rotation.

tropic snow Oct 9, 2019, 12:44 AM

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it will have tps mesh and fps mesh

dark edge Oct 9, 2019, 12:44 AM

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I'm guessing its perfectly smooth on the host?

tropic snow Oct 9, 2019, 12:44 AM

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yes

dark edge Oct 9, 2019, 12:46 AM

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Yeah you're using a replicated variable somewhere

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Where's the math that calculates your aim offset?

tropic snow Oct 9, 2019, 12:47 AM

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well all my variables are replicated just running through the server

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yaw and the pitch

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📎 fetch.png

dark edge Oct 9, 2019, 12:47 AM

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They should be locally calculated based on control rotation. The control rotation should be replicated

tropic snow Oct 9, 2019, 12:47 AM

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This is it