multiplayer

[peak sentinel]

Its rep condition is set to skip owner

[lusty fractal]

Does anyone know why using a seamless server travel would make clients completely lag? Or does anyone know how to make non-seamless travel work with Steam?

Feel free to @ or dm me

[violet sentinel]

i guess they were lazy to store it in transient member variable

still there is no multithreading or recursion so nothing would break

[golden nest]

Hi. Does someone know if i want to replicate a variable in a component, the actor must replicate first?

Or i can leave the actor not replicating and set the variable to rep

[meager spade]

Actor has to replicate

[final thicket]

I think components need a replicated actor afaik

[meager spade]

and the component needs to replicate

[bronze summit]

Hey for my game I want to implement a admin panel a assigned admin can login to using a command like this: https://www.orfeasel.com/creating-console-commands/ I was wondering if this is even supported for Multiplayer. The workflow would be Enter server and assign default pawn->call command (attempt login password or something)->take control of a created admin player controller. And is this even secure to do?

[meager spade]

if you are running dedicated servers, you can have some auth system linked to the players unique ID

or some RCON system if you want

[bronze summit]

Yeah I was thinking of using SteamID list or equivalent of other subsystems

[meager spade]

console is disabled in shipping builds

[final thicket]

You could just make your own console,

[bronze summit]

Ah thats what I was wondering too but yep ^ thats what I will do its def helpfull incase of bug reports etc

[final thicket]

depends what you want to do with it though I suppose 😅

[lost inlet]

or allow console in shipping

[bronze summit]

If Im correct you can't really swap out playercontrollers at runtime on a connection so I'd have to do it using a pawn correct?

[silent valley]

There was some article I saw on UDN recently that was talking about using the Stats port connection with the engine to use REST calls to administer the dedicated servers

Use firewall on your server to only allow connections on that port from specific address or vpn

of course, it can be handy to have a super user in-game console too

[silent valley]

I don't think that's correct, see UCheatManager::EnableDebugCamera() which switches PC while connected

you can test by typing EnableCheats followed by ToggleDebugCamera

[bronze summit]

But don't cheat managers get stripped from the release build?

[silent valley]

yes but there's no reason why you don't implement your own

all I'm saying is switching PC should be possible even in Shipping builds

[bronze summit]

Hmm interesting Ill have a look thanks. Couldn't really find anything because it would enable me to just create a whole standalone controller for admins which might be more robust

[silent valley]

If you wanted to to have a standalone app, for monitoring server health, some basic server wide admin etc, then using http connection over the stats port might be a good idea. Especially if you wanted to administer multiple servers at once.

[bronze summit]

Yeah well that's not really the problem as I might go for Microsoft* Playfab as dedicated hosting. But I want to allow players to host their own servers and with that some tools might come in handy especially because I don;t have any plans for implementing a intermediate language to allow plugin creation* or for singleplayer(but that does not really require and auth)

[hoary lark]

I'm just making sure you understand, if you change your "last shot" variable ten times quickly, the server might only send out five of those updates, and other machines won't even get most of the shots (unless this is a confederation war sim where fire rate is measured in minutes per shot instead of shots per minute)

[peak sentinel]

I thought replicated variables always being send if the actor is relevant?

[hoary lark]

No. They are always eventually updated to the current value.

[peak sentinel]

https://tenor.com/view/chuckles-im-in-danger-ralph-wiggum-the-simpsons-gif-14149962

[eternal canyon]

Only if the server detects a change from the last state sent

I’m pretty sure

[peak sentinel]

Its fine that some projectiles will not be fired in clients, I'm trying to find out if the same issue causing desync between fired shot count or not, but still its good to know

In the end only servers projectile pool has authority to damage things

Probably I need to use a struct with burst counter integer

[blissful totem]

Short Question: I have an AI controller on the server that is trying to tell a pawn to run a multicast event. The event runs on the server, but not the client. Is this expected. Is it because the AI controller only exists on the server? My intuition says this should not matter because the controller emits the event, the server instance of the pawn hear's it, and then broadcasts it to the clients.

[silent valley]

There is no client version of the AI controller, they're server only

[blissful totem]

I'm aware

My question is can the AI Controller tell a pawn to multicast an event

[fading birch]

Yes, it should be able to, no problem

[silent valley]

Yes that should work

[blissful totem]

Hmm

Ok I think the issue is that I was passing a reference to the Task to the pawn's event so that it could run a callback when the montage finished... That seems to have caused a silent failure on the client's end

Ok let me try the long question then... I'm trying to get a unit to get on cover in an RTS setup. Flow goes like this:

• PlayerController selects unit and clicks on cover
• Unit's AI Controller BT enters a "Get on Cover" Task
• Task plays a multicast event to play a "getting on cover montage", passing a reference to itself.
• When montage is finished on server, a callback is sent to the task that says the task can finish execution

Problem is I cannot pass a reference to self on the multicast, even if the client does not need this information during the event

[earnest narwhal]

Heya, Im trying to hide dead players to alive players, but show them to each other, think Phasmophobia. But I cant use SetHiddenInGame since if I set it on server its set for everyone

Anyone knows another way to hide actors/meshes thats local only?

or how to stop replicating a specific variable

[violet sentinel]

send RPC and hide them on client ?

[twilit radish]

I believe SetHiddenInGame is local and not replicated down to clients. It also depends on whether you care about cheaters btw, because just trusting the client to hide it may not be the best idea depending on your game.

[earnest narwhal]

It work perfectly on Client, but when the server tries to hide dead players/unhide them, its replicated to everyone

bHidden is replicated in Actor D:

And bHidden is also replicated on SceneComponents, so cant just hide those either

[fringe dove]

what's the normal way for a client to add a second local player to a multiplayer game that is already underway? Will GameInstance->CreateLocalPlayer on the client end up triggering a AGameModeBase::Login for them?

[earnest narwhal]

For anyone wondering, made it work doing this:

GetRootComponent()->SetHiddenInGame(true, true);

on the actor I wanted to hide

[proven fog]

How should I have logic run on a pawn in a multiplayer game which depends upon values in the client's GameInstance?

[violet sentinel]

by not relying/ storing values in client game instance

most likely game state or player state

[proven fog]

It's set in a different world

If that matters. It's a checkbox in the main menu, then they connect to the server. It's to set whether VR is enabled when they join.

[thin stratus]

Do you have C++ available to you?

Because the easiest way would be sending it via the options when connecting

And then grabbing it from the options string in the GameMode that you get in PreLogin and Login

e.g. ?Device=VR and ?Device=PC
That's how I did it last time I had to work on a project like this

[proven fog]

Thank you!

So the pawn exists when AGameModeBase::Login is called?

[thin stratus]

No, but you can save the data in the PlayerController

Which is created from Login

And when the GameMode spawns the pawn you can take that info and give it to the pawn

Or just grab it from the PlayerController in the Possessed Event of the Character

And then replicate it down

But that's the easy part of this :P

[proven fog]

XD "the easy part"

Is there usually a lot of "running around" data between these classes?

[thin stratus]

How do you mean

[proven fog]

Passing data from the GameInstance, to the GameMode, to the PlayerController, to the Pawn.

[thin stratus]

Maybe

I barely use the GameInstance for stuff like this

GameMode->PlayerController->Pawn, yeah

cause they all exist in the same world and are meant for Gameplay code

GameInstance I usually only use for things that are relevant to the game itself, without any replication in mind

[proven fog]

Oh okay

[ionic scaffold]

when talking about actor in this, do we mean an instance of the actor?

[empty axle]

yes

[hexed pewter]

If i want a running prototype multiplayer game, Beacons are optional, not required right?

[ionic scaffold]

Cool cool cool, so does the rpc know which instance we are talking about? Is there a 1 on 1 relationship between the instance of an actor in the client and the actor on the server?

Because my understanding is that those are two different actors, even if they look the same...

[lost dune]

Hello , i have hyge lags after i unpossess and destroy my controlled pawn

why?

[harsh rock]

Hey, when I disconnected from a session by using DestroySession, the Logout method of the gamemode is never called. Ideas?

I also noticed that the controller is not destroyed, neither is the playerstate

[thin stratus]

DestroySession is not a way to disconnect

You have to actively leave the map

[harsh rock]

Oh, okay, let me try that

[harsh rock]

I'm using c++, what's the best way to actively leave the map?

would UGameplayStatics::OpenLevel work for that?

[lost inlet]

well yeah you can travel the main menu map as a client

[harsh rock]

Okay, called destroy session and changed the world. I'm assuming I have to send some sort of event to the server to destroy the controller?

[lost inlet]

usually when you disconnect from a server, it'll cleanup the PC on it

[harsh rock]

Yes, for some reason it's not doing that in my project

I have breakpoints on controller destroy and logout and neither are hit

[lost inlet]

in C++?

[harsh rock]

yes

[lost inlet]

I'll look at how we implemented our exit to main menu

[harsh rock]

void UMyGameInstance::Disconnect()
{
    IOnlineSubsystem* OSS = Online::GetSubsystem(GetWorld());
    IOnlineSessionPtr Session = OSS->GetSessionInterface();

    Session->DestroySession(FName(TEXT("MyGame")), FOnDestroySessionCompleteDelegate::CreateLambda([&](FName SessionName, bool bWasSuccessful)
    {
        UE_LOG_ONLINE(Error, TEXT("Leave session %d"), bWasSuccessful ? 1 : 0);

        UGameplayStatics::OpenLevel(GetWorld(), FName(TEXT("/Game/Maps/MyGameEntry")));
    }));
}

this is getting called by a widget blueprint to leave the session

[harsh rock]

I was using shootergame for reference, but it works normally there, but on mine it doesn't for some reason

[lost inlet]

well we just travel to the main menu, the server manages the session

not the client

[harsh rock]

Okay, I changed my code to just travel to the main menu, no more destroy session

But how does the server know when to disconnect someone?

[lost inlet]

they'll probably timeout

having the client handle the session is valid though

[harsh rock]

okay

So the only way to get fast feedback is to tell the server to delete the controller before the client leaves?

[lost inlet]

UEngine::HandleDisconnect can probably send a graceful disconnection to the server

that's what the "disconnect" command sends

[harsh rock]

ahh

I tried that too, but it didn't trigger the logout either

I'll try it again

yeah, disconnect still leaves the controllers on the server

¯_(ツ)_/¯

[lost inlet]

how are you verifying this?

[lost inlet]

and what world?

[harsh rock]

The lobby world

[lost inlet]

that is not the answer since you can select to see the client or server world

also if you use an out of process server then your breakpoint won't hit

[harsh rock]

Oh, right, server world

yes, it's a single process listen server

[lost inlet]

well that makes no sense

[harsh rock]

Yeah 😂

I'm confused too

[lost inlet]

"play as client" is dedicated

[harsh rock]

I launch two clients like this, and connect with hostsession and joinsession

would that affect anything?

I just tried loading the map directly and playing as listen server, still doesn't work

Sorry for being stupid, I'm relatively new to this XD

[fringe dove]

ad-hoc adding splitscreen player on client after already connected to dedicated server with UGameplayStatics::CreatePlayer did work, but trying to remove it seems to more or less fail, and then calling CreatePlayer again after RemovePlayer caused a hang..

based on that FIXME it seems they don't support removing a splitscreen player during online play?

[harsh rock]

There should be some demo code that does something similar in the ShooterGame demo project

[fringe dove]

shootergame seems to do everything up front setting up splitscreen before joining

I changed some defines to make it allow splitscreen on PC

I'll look through and see if they have anything for removing a local player during play though

[harsh rock]

Does anyone know why DestroyActor isn't called on PlayerController when leaving a session?

[violet sentinel]

aren't they usually cleaned up by GC with old world ?

[harsh rock]

that's what I thought too, but it's not cleaning up...

perhaps I made a mistake when creating the session

But the logout function isn't being called, and the player state, controller, and pawn are not garbage collected

I think I'm going to make another project and try to reproduce this issue

[meager spade]

Likely missing a super call somewhere

[harsh rock]

That’s what I was wondering

What’s the standard way to do a controller constructor?

I've seen both (const FObjectInitializer& ObjectInitializer): Super(ObjectInitializer) and (): ClassName() as constructor signatures

[fossil spoke]

Specifying the class name directly instead of using Super may indicate they wanted to skip a parent constructor for some reason.

Or they just didnt know Super existed?

[harsh rock]

Okay, but do you need the fobjectinitializer part

I guess you probably would, as super takes an argument

[meager spade]

It depends if you need to override some default objects.

Most of the time you just use the no args constructor

And always just use GENERATED_BODY not the old ones.

[wet bridge]

I have been told that to do online properly you need to change the engine source code. I can not find much information about this online. Anyone have any resources, or want to just tell me

or both

[fossil spoke]

Not sure where you heard that but "Online" works out of the box, its a pretty broad term though.

You may need to be more specific.

Connecting Clients together in a Multiplayer match works fine with no need to modify any source code.

You do however have to compile the engine from source in order to build a Dedicated Server executable.

[wet bridge]

So I have heard this from people at unreal, several forum posts, and from the source code people on this discord

[fossil spoke]

You need to be more specific on exactly what you mean by "to do online properly"

[wet bridge]

to be honestly, I am a bit vague on what it is either. I know I have setup a basic online game where you have to connect up to a single player and have them act as the server. Maybe this is for running dedicated servers?

[harsh rock]

What’s the end goal

If you want a client to also be a host and other clients connect to it, that would be a listen server

Dedicated server is a bit different

I’ve never had to modify engine code to get standard stuff working

[fossil spoke]

I think hes confusing "modifying" with simply compiling the source.

You dont need to modify anything to get working multiplayer.

[harsh rock]

Oh that makes sense

[wet bridge]

If I was to be honest, the end goal would be 4 people being able to freely roam in a world composition map

[fossil spoke]

Thats easily do-able. The only hard part would be creating the dedicated server and thats not even hard.

You could manage it with a listen server.

[wet bridge]

what I have heard is there are problems with world origin shirfting for large maps in multiplayer but everyone is so vague on it that I don't know what the problem is

also you were saying you need to compile the engine source code instead of using a prebuilt engine to get multiplayer to work?

[fossil spoke]

No thats not what I said.

I said you have to compile from source in order to get a Dedicated Server executable.

Listen Servers do not require this step.

[wet bridge]

ok, that makes sense

so listen server is for when everyone connects to one player who acts as the server, while dedicated is when the server is on a separate machine from everyone else and they just connect to it correct?

I have heard dedicated servers are needed for world composition maps unless you restrict the distance the player can go on the listen server

but maybe that is only for large numbers of players

[fossil spoke]

This is correct.

[worn glade]

can one hud auto-adjust for splitscreen? for example i make 1 single hud and when i use splitscreen horizontal

because of the anchors it will adjust all the widgets

to fit? or i need to make a hud for splitscreen and a hud for single player?

[fossil spoke]

@worn glade This maybe better asked in #umg

[worn glade]

right

thanks

[harsh rock]

Andddd fixed... Thanks, I was stuck on this for two days 😅

@fossil spoke thanks for the clarification on the constructors as well

[wet bridge]

sorry I misspoke before. I meant world origin shifting not world position offset

but maybe that isn't a problem unless the level is incredibly large. I honestly don't know when the floating point error stuff starts to be a problem

maybe the ue4 docs are out of date as I am seeing some reference to some people saying that world origin rebasing is available in online maps

maybe not. I don't know

[proven fog]

When I override AGameModeBase::Login, what APlayerController* do I return?

And do I call Super() at the end of my implementation?

[lost inlet]

if you're not doing custom stuff with the player controller, return the Super function's result

you can see what that function does in GameModeBase.cpp anyway

[white nimbus]

Hey there, I'm trying to make a small multiplayer game and I think I forgot something important but I can't find it
if anyone have an idea, this is my problem

I created a Controller and Character BP and when I launch the game in multiplayer clients + server, only the server have a character, I can move the clients but there is no Character on it, also, the input control is not the same as the server

[chrome quest]

Did you make sure to set the character as default pawn in the game mode?

[terse prawn]

Is there a way to make a child actor component "only owner see"?

[fading birch]

make it not replicate?

[sand iris]

Is the replication frequency of replicated variables in an actor component determined by the NetUpdateFrequency of the owning actor?

[fossil spoke]

Yes, Components use their owning Actor as the conduit for which they have their variables replicated.

Since their owning Actor has the ActorChannel that allows properties to replicate.

The Actor will call a function ReplicateSubobjects which is where components (subobjects) manage their variable replication.

[sand iris]

I see, thanks for explaining!

[worthy knot]

difference between these two?

[bitter oriole]

Nothing in common really

First checks if it's a server

Second checks if it's authority, which returns true for non-replicated actors on the client, or in single-player

[white nimbus]

yes the character is the default pawn

[worthy knot]

ive always been using the has authority instead of is server, i think its time to switch

[true grotto]

Hi everyone. I noticed that when starting my multiplayer game, the first player is initialized once and the second as many as three times. Is this normal or am i doing something wrong?

[violet sentinel]

"Play as client" with 2 clients?

[true grotto]

Yes

[violet sentinel]

client instances + server instances

[true grotto]

Why is there only one BP_BasePlayerCharacter_C_0?

[violet sentinel]

that is just generated name index

[true grotto]

That is each client has its own server?

[violet sentinel]

no

[true grotto]

Why i have 2 server instances?

[violet sentinel]

why do you think it is server instance?

[true grotto]

aaa, this Is instance of player on server?

[empty axle]

the BeginPlay gets triggered on serverside and on every clientside

[violet sentinel]

^

object names means literaly nothing, print roles or something more signigicant

[empty axle]

so in case of dedicated server and 2 players you will have 2 BeginPlays on server and 2 on every client

[true grotto]

Ok, i think i got it, thanks

[violet sentinel]

Is there any way to replicate actor tags?
Since it is in base actor class doing it there would be troublesome
since it is blueprintreadwrite there is no guarantee that someone won't change them directly bypassing Add/RemoveTag functions

[onyx dawn]

hi guys, is it guaranteed for the actor role to be replicated by begin play?

[rich cradle]

is it somehow possible to disable an actor from loading on a server during map load?

[meager spade]

@onyx dawn yes

@violet sentinel just mark them replicated if you need too

even if they are mutated directly, they will still replicate

tho i highly recommend using GameplayTags over ActorTags, IMHO

[violet sentinel]

i can't modify Actor.h 😦 not on source build

[meager spade]

make your own actor class

[violet sentinel]

for now setting up a replicated copy in my actor class

[meager spade]

i have GameplayActor

[violet sentinel]

yeah

[meager spade]

this holds replicated Gameplay Tags, etc

you can replicate ActorTags via it aswell

without touching engine code

[violet sentinel]

in prereplication i copy actortags to replicatedactortags for server
in onrep copy replicatedtags to actortags on clients
would be much easier if i could guarantee that noone would change actortags directly

[meager spade]

does it matter?

it will still replicate

if they are changed on the server..

just replicate ActorTags..

[violet sentinel]

don't you have to have Replicated on the uproperty in actor.h for that?

[meager spade]

ah true, doh, ofc 😛

i really don't use ActorTags tho

[violet sentinel]

i don't want to use it too, but some ... spaghettiblueprint coders just do everything with GetAllActorsWithTags and ofc it breaks for multiplayer

[onyx dawn]

@meager spade thanks for the response.. I'm having some weird cases where the role isn't replicated with the actor spawn.. any ideas?

[white nimbus]

Hey there, anyone have an idea of my issue ?
My PlayerController don't show the default pawn ( ThirdPersonCharacter )
the PlayerController is working but it's like the players don't possess the Character, clients and server side

the default Pawn is good and the default GameMode is good

[twin juniper]

How is it that a game like minecraft can hold up to and beyond 100 players per server while an Unreal Engine game, I heard, has a 64 cap out of the gate?

[hollow eagle]

There's no hard cap on how many players unreal can support. It's a practical limitation based on the type of game you are making.

Minecraft has super low requirements due largely to trusting clients and not requiring server approval for everything you do. Plus the game itself doesn't have that much going on at any one time, especially compared to something like a fast paced FPS.

Additionally, 100+ player minecraft servers require very beefy hardware setups. Just because minecraft can support 100 players doesn't mean that's something easy to do.

[twin juniper]

Thank you for the response

[grand stratus]

here in my player state bp i copy the properties to new player state while seamless travel and it enters the function and do the logic

but after the travel is finished i try to get the color here and i get the default value of the color

idk is the player state i get from the player controller is not the one i get from event copy proprties

thanks in advance

[violet sentinel]

is color variable replicated? copy happens on server so still needs to be replicated to client

(don't see replicated icon next to it)

[grand stratus]

Should i make the color variable replicated too

I thought i just need to assign it in the ne player state

Cause i dont think replication will benefit in anyways

I think i understand now

Let me check this way

I need to ask smth

Now this variable at first os set to random color when i join the lobby

In a server rpc function

And i can see my color from client player

Without making the variables replicated

Why then i need it to make it replicate while copy properties run on server too as the server rpc i made to set the random color at first before travel

[quiet fjord]

guys I have jerks in the replicated rotation with a timeline in a lerp the character in the clients I see how jerks how could I improve that so that it goes smoothly

[rancid flame]

Is there a way to spawn 2 sessions from within the UE4 editor, but not have htem connect automatically, so I can test my Join Session code?

[hollow eagle]

There should be an option in project (or maybe editor) settings called "auto connect to server"

turn that off

I'd check exactly where it is but I can't open the engine right now 😛

[rancid flame]

hmm i had a look but couldn't see anything like that :S

[rancid flame]

if you get a chance could you take a look sometime?

[hollow eagle]

If you click the dropdown next to the play button (where you set the number of clients) it should be under advanced settings

[fading birch]

I think it's this:

[hollow eagle]

It is. At some point they changed the option.

[silent phoenix]

Hey Team,

Hoping someone can set me in the right direction. If I have a replicated variable (stamina) that is degraded over time but the rate can be modified I am currently using a timer for ever player to set their stamina. This works but I'm concerned about the growing numbers of timers running on the server. Obvious solution is to run the timer on the client but then the frequency could be modified.

If every player has a different rate what is a better way to handle this?

[dull lance]

how many players / server session are we talking about?

[dull lance]

also if you're doing this inside C++, you could just do the different "rates" as simple timelines on tick if Authority. That way it's just a couple of additional bool + float operations within a single tick operation

and by simple timeline i mean ```cpp

Tick(float Deltatime)
{
if (HasAuthority() && bChangingStamina)
{
StaminaTimer += DeltaTime;
if (StaminaTimer >= StaminaRateTime)
{
DegradateStamina();
StaminaTimer = 0;
}
}
}```

etc

[silent phoenix]

appreciate that. this project wouldn't have too many clients but what if it was like 50 sessions? Is there a different approach?

[dull lance]

50 sessions on a single server? Are you doing dedicated servers with split processes?

[silent phoenix]

I'm not running 50 sessions, i'm just inquiring about how it would be handled in larger scale multiplayer games

[dull lance]

but you are running dedicated servers?

[silent phoenix]

yes

[dull lance]

I mean either way handling multiple "time processes" inside a single tick process is going to be better than doing 1 timer/process at the woldtimermanager

ofc [just in case] doing things in c++ over bp will vastly help with performance

[silent phoenix]

Yes sir c++. Just trying to learn more performant ways to write multiplayer code. Tutorials have only got me so far, no one really goes in depth about optimizing network performance

atleast not that i've found

[crystal crag]

So I randomly started to get a crash caused by replication of objects that I have not changed in months

To make sure that I am not chasing a ghost

Does this mean that the controller doesn't have an outer?

Or is it the sub obj class that is causing the outer ensure to fail?

Ah, you know what, the ensure actually does call out the sub obj as the problem

so weird. I haven't touched my inventory system

Why would the player controller not replicate first when the component that holds the sub object causing the ensure to fail belongs to the player controller?

[dull lance]

what is the actual error

[crystal crag]

One moment, re-launching the editor to make sure I give you the right information

while I am waiting for this to load up the dedicated server / PIE - if I add an await Task.Delay(17500); to the web service returning the inventory, then I don't get the crash

quick tests at 8500 and 9200 still encountered crashes

Ensure condition failed: ObjOuter != nullptr [File:C:\src\UE5Main\Engine\Source\Runtime\Engine\Private\DataChannel.cpp] [Line: 3774]
UActorChannel::ReadContentBlockHeader: Unable to serialize subobject's outer. Ensure that subobjects are replicated top-down, so outers are received first. Class: RaevinInventoryEquipSlot, Actor: BP_RaevinPlayerController_C_0

[dull lance]

how are you adding that component to the ctrlr

[crystal crag]

private:

    FTimerHandle CreatePlayerHUDHandle;
    FTimerDelegate CreatePlayerHUDDelegate;
    FRaevinControllerOnPossessEvent OnPawnPossessedEvent;

    UPROPERTY()
    class URaevinPlayerInventoryComponent* InventoryComponent = nullptr;

    UPROPERTY()
    class URaevinPlayerMissionComponent* MissionComponent = nullptr;

and then in postinitializecomponents

void ARaevinPlayerController::PostInitializeComponents()
{
    Super::PostInitializeComponents();

    UE_LOG(LogRaevinInventory, Warning, TEXT("%s()"), TEXT(__FUNCTION__));

    InventoryComponent = FindComponentByClass<URaevinPlayerInventoryComponent>();
    if (InventoryComponent != nullptr)
    {
        InventoryComponent->SetIsReplicated(true);
    }
    else
    {
        UE_LOG(LogRaevinInventory, Error, TEXT("Did not find a raevin player inventory component on this controller!"));
    }

    MissionComponent = FindComponentByClass<URaevinPlayerMissionComponent>();
}

the inventory component is added to the player controller's BP via AddComponent

[dull lance]

oh god please no

[crystal crag]

?

[dull lance]

this line is what's causing it InventoryComponent->SetIsReplicated(true);

[crystal crag]

It is?

[dull lance]

Why are you adding the component at the BP level

[crystal crag]

Because there are many different types of inventory components

and I want the BP inventory component to be used

that's weird that that is the line causing it

just because of how long that has been there

[dull lance]

Maybe a better question

[crystal crag]

6/15/2020

[dull lance]

Why is the component not replicating by default?

why are you setting it to replicate there?

[crystal crag]

oh I shouldn't be doing that I'm sure. I forgot that line was even there

URaevinInventoryComponent::URaevinInventoryComponent()
{
    PrimaryComponentTick.bCanEverTick = true;

    bWantsInitializeComponent = true;
    SetIsReplicatedByDefault(true);

    InventoryItemsOld = TArray<URaevinInventorySlot*>();
    InventorySlotsOld = TArray<URaevinInventorySlotSet*>();

    InventorySlotData = TArray<FRaevinItemEntryOld>();

    InventorySlots = FRaevinSlotEntries();
}

I am doing it in the constructor, so calling it there is pointless anyways

[worldly hawk]

Hey guys!! Just finished single player version of my game. Want to add a multiplayer component. Do I need gamelift? Or can I have the mobile devices host their own games? It’s a mobile game.

[dull lance]

Is this your first time doing multiplayer? (RatPoison)

if so, you're probably going to have to re do a significant amount of your logic

but I digress. Are you intending to do dedicated servers?

[crystal crag]

I got rid of that line

let's see if it crashes

still crashes

It's so weird

I haven't touched this code

in forever

I've been working on other parts of the game

[dull lance]

Hot reload?

[crystal crag]

nothing touched the inventory system uobject or the related inventory classes

disabled

Disabled with a passion

Happens in eithe rDevelopment Editor or Debug Editor

[dull lance]

can you post the call stack

[crystal crag]

sure

'

and the weird thing it this just started maybe three days ago. I can't remember the exact day

but very recently. I've inspected my git differences

(haven't checked in for about a week)

[rancid flame]

@hollow eagle @fading birch Sorry to be a pain. So I've tried Play as client + Launch separate server and it seems to still connect

[crystal crag]

and nothing is jumping out at me

you need to select standalone

to get it not to auto connect

would probably recommend not running under single process either if you can help ity

*it

https://pastebin.pl/view/cc8c0eac

that's the stack trace

I guess it wouldn't hurt to hold off on modifying the replicated fast array until the client fires off a server RPC once OnRep_SetController is called or whatever the onrep method is called once the controller gets replicated down

[worldly hawk]

but I digress. Are you intending to do dedicated servers?
@dull lance not if I can avoid it. Yes it’s my first time doing multiplayer.

if so, you're probably going to have to re do a significant amount of your logic
What logic are you referring to? Can I do it with blueprints? It’s a very simple turnbased puzzle game.

[dull lance]

What I mean is that multiplayer games are usually wired quite differently when it comes to handling information

[worldly hawk]

Oh ok. I’m aware that I have to write the whole game logic again for multiplayer

[dull lance]

so depending on how you well you designed your framework from the get go, you'll probably have to redo a bunch of stuff

[worldly hawk]

Can I do it without plugins?

Especially for mobile

[dull lance]

multiplayer has nothing to do with plugins

if we're talking about the game itself

platforms and sdks are a different story

[worldly hawk]

Let’s say I’m doing android.. can I just have one of the phones host the game rather than using something like gamelift?

I noticed unreal has a create session node. Where is this session created? On thé phone that’s clicking the button?

[hollow eagle]

depends on the online subsystem in use

[worldly hawk]

It’s Google play

[glass vector]

how does the AI and behavior tree work in multiplayer, does behavior tree only execute on the server?

if I spawn an AI enemy, does the client and server run different instances of behavior trees, or is there only one behavior tree on the server?

[winged badger]

AIController runs the BT, and they do not replicate by default

which makes it server only

[glass vector]

so does it mean that the AI controller only exists on the server, the client doesn't have AI controllers instanced?

[winged badger]

yes, they do not replicate means they don't exist on clients

[harsh lintel]

I'm cooking the server with the project launcher inside the editor, when I make checks like IsDedicatedServer, the check works when playing in PIE, but the check doesn't seem to work when the server is deployed IsServer does work, is there a reason for this

[winged badger]

unless you do something very wrong

source engine editor build?

[harsh lintel]

yes

[winged badger]

did you set the target to dedi?

[harsh lintel]

I don't know if there's a choice for Dedi when you cook the server through the editor project launcher

[winged badger]

there is bound to be a tutorial for that around, i have not had the pleasure of having to package dedi build yet

as we use listen servers

[harsh lintel]

I see, well thanks

[fading birch]

@harsh lintel WindowsServer would be dedicated server in that instance. IsDedicatedServer should return true as well.

not sure why it wouldn't.

[rancid flame]

Do people still use Hamachi for doing LAN-like stuff over distance? Like if I want to test this simple prototype thing and not worry about opening up ports or whatever?

[dull lance]

For older games hell yes they do

idk about recent ones though

[worldly hawk]

Trying to figure out the use of AWS gamelift when making multiplayer mobile game. What’s the advantage?

Cross platform multiplayer?

[fossil spoke]

GameLift is for deploying Dedicated Servers and managing Matching Players together into those Servers.

GameLift doesnt care what the Client platform is.

Be it Mobile, Console or PC.

[worldly hawk]

Using just the nodes in unreal, will I be able to host a game from one phone and have another phone join it online? (Not over LAN)

[fossil spoke]

I guess so?

Use the Session nodes.

Run a Listen Server.

[grand stratus]

anyone knows how can i make sure that all the player states variables are replicated to me before checking them as a client

btw after server travel seamless one

[bitter oriole]

You can simply initialize them in constructor to an invalid value, and wait for valid values.

[grand stratus]

what do u mean

but waiting in multiplayer is not good

cause i use delay

[bitter oriole]

Not waiting as in delay, waiting as in "ignore this variable until it's set to a valid value"

You can for example keep your loading screen up and check on tick that all values are not invalid

[grand stratus]

btw

after server travel

it also takes time for player state to get created

and more time to replicate the variables

so i think i should check on tick all player states untill they are valid

and i think its not good to check on every tick for ever untill the match finishes

[bitter oriole]

Why not ?

[grand stratus]

i think it affects the game play

or latency

[bitter oriole]

No, it doesn't

[grand stratus]

network stuff

[bitter oriole]

No, not at all

Doing too much Blueprint work on tick, specifically, may adversely impact performance

Checking a few variables is perfectly fine

[grand stratus]

okay lets try

[grand stratus]

@bitter oriole

this what i have done

but the player state is invalid all the time

idk why

i print string if its invalid and it just keep printing it

[bitter oriole]

That while loop is a terrible idea

Everything is single threaded in Unreal so the event that may disable the wait will never update during the loop

[twin juniper]

Hey Guys im just needing some help on figuring out how to sync up my Character Part System To Apply a Character To the Already Existing Client In my game existing client sees the new joining clients character i know that works but for whatever reason the new joining client does not see the existing clients character ive looked over my Character Part System and it seems to be fine considering it works one way just not vice versa i also call my Equip Character Function on begin play so maybe that has something to do with it?

The Existing Client

the New Joining Client

[grand stratus]

@bitter oriole so how can i perform the same logic without while loop cause this while loop should be completed when i set the condition to false again in the event tick

[bitter oriole]

The while loop (if it's not disabled by the compiler as something that makes no sense) can never exit

Because the tick event would never ever exit it

More accurately, the tick event would never have the opportunity to fire

Because the entire game would be stuck in that loop

Events are not concurrent

[grand stratus]

No it enters the event tick

I tried to but a print string

And it just keeps print cause the boolean variable is not set to false again at last

[bitter oriole]

So check where in the tick graph the flow stops

Add more prints

[grand stratus]

U see the is valid node

Is just don’t continue after this point

Cause player state is not valid all the time idk why

But before the tick event it was working , it takes just a small time to be present

[bitter oriole]

Maybe it's just not the correct type

[grand stratus]

What do u mean

[bitter oriole]

Maybe it's a different game state class

Sure the IsValid fails and not the cast ?

[grand stratus]

Yeah is valid is the one fails

But bot game state is used here

I just have a list of pkayer controllers

And then i get player states from it

But i think the problem from while loop

[bitter oriole]

Player controllers are not replicated

[grand stratus]

But how can i do same logic whitout loop

[bitter oriole]

So there's that too

[grand stratus]

I know its not replicated

From the server i get the player controller lost

List

And pass it to the client

[bitter oriole]

That list cannot exist on client

You can't copy unreplicated actors to the client

So the list has exactly one player (you)

And you should not use a loop - you should do a "are players ready" function, not a "wait" function (that's not possible)

[grand stratus]

What is are player ready function

[bitter oriole]

Remove the loop, just check the "are players ready" bool

true = do stuff

false = keep loading screen

[grand stratus]

What do u mean by false keep load screen

I think if its false it will just go through the bext player controller in the list

And when it finishes it set are player ready varaiable to true

[bitter oriole]

Okay I don't have the time to write the entire thing for you so here is what you do

• set default values to your necessary player state vars (like -1 for health)
• write a Blueprint function that gets the game state from the player, checks if it's valid, and check all necessary variables inside to see if they have non-default value
• if they do, return true, if they don't or the state isn't valid, return false
• call this function in tick and if false, disable input and set the screen black with a widget, if true do nothing, you can play

[grand stratus]

That what iam doing but just did not use the game state

Anyways

The blue print function need to be called some how

Where should it be called

[sweet marsh]

Hi guys, has anyone run into crashes when applyingdamage to a destructible, it seems to crash and i can't for the life figure out why

and this is only in a packaged build, in the editor it works fine for both server and client

    {
        ServerBreakDestructionMesh();
    }
    else
    {
        // The item is now broken
        bIsBroken = true;

        // The item cannot be interacted with (picked up)
        bAllowCollisionChecks = false;
        On_RepAllowCollisonChecks();

        // Break the mesh apart (on client and server)
        //MulticastBreakDestructionMesh();

        FVector MovementDirection;

        if (StaticMeshComp)
        {
            MovementDirection = StaticMeshComp->GetForwardVector();
            StaticMeshComp->SetSimulatePhysics(false);
            StaticMeshComp->SetCollisionEnabled(ECollisionEnabled::NoCollision);
            StaticMeshComp->SetHiddenInGame(true);
        }

        if (DestructibleComp)
        {
            //Set the destructible mesh so we can see it in the world
            DestructibleComp->SetDestructibleMesh(DestroyedMesh);
            //TODO improve the damage applied to include force so it explodes when moving fast
            //DestructibleComp->ApplyDamage(MaxHealth, GetActorLocation(), MovementDirection, 6000.0f);
            DestructibleComp->ApplyRadiusDamage(MaxHealth, GetActorLocation(), 100.0f, 6000.0f, true);
        }


        // Destroy after delay
        DestroyItem();```

the multicast causes a crash and the following which as you can see applies the damage via the server seems to do nothing to the object on the client

[meager fable]

Okay, so i I have

    UFUNCTION(Server, Unreliable)
    virtual void SendState_Server(const FTransformNoScaleNetState& State);

void AMyActor::SendState_Server_Implementation(const FTransformNoScaleNetState& State)
{
    GEngine->AddOnScreenDebugMessage(-1,0.1f,FColor::Cyan,FString::FromInt(HasAuthority()));
}

And that sometimes prints out 0, my actor's owner is a pawn that is always controlled by someone, checked in deriving blueprints and all the clients can send rpc's on AMyActors they own. Not sure how can I not have authority on a function that runs on a server

[sweet marsh]

its set to unreliable

although it shouldn't affect that have you tried making it reliable?

see what happens?

[meager fable]

can try that but that function cannot be reliable as it's sent too often

[meager spade]

HasAuthority does not mean server

that could print out 0 if the actor or w/e is created client side, before the roles have been swapped.

Authority means who is authoritive over this actor, not if its server/client

[meager fable]

the actor is spawned on the server and replicated

so Authority should mean server right?

[sweet marsh]

@meager fable i find this quite quite helpful when checking stuff:```/*if (GetLocalRole() == ROLE_Authority)
{
GEngine->AddOnScreenDebugMessage(-1, 3.0f, FColor::Green, FString::Printf(TEXT("Local = authority")));
}
if (GetLocalRole() == ROLE_SimulatedProxy)
{
GEngine->AddOnScreenDebugMessage(-1, 3.0f, FColor::Green, FString::Printf(TEXT("Local = simulated")));
}
if (GetLocalRole() == ROLE_AutonomousProxy)
{
GEngine->AddOnScreenDebugMessage(-1, 3.0f, FColor::Green, FString::Printf(TEXT("Local = autonomous")));
}

if (GetRemoteRole() == ROLE_Authority)
{
GEngine->AddOnScreenDebugMessage(-1, 3.0f, FColor::Red, FString::Printf(TEXT("Remote = authority")));
}
if (GetRemoteRole() == ROLE_SimulatedProxy)
{
GEngine->AddOnScreenDebugMessage(-1, 3.0f, FColor::Red, FString::Printf(TEXT("Remote = simulated")));
}
if (GetRemoteRole() == ROLE_AutonomousProxy)
{
GEngine->AddOnScreenDebugMessage(-1, 3.0f, FColor::Red, FString::Printf(TEXT("Remote = autonomous")));
}

if (GetNetMode() == NM_Client)
{
GEngine->AddOnScreenDebugMessage(-1, 3.0f, FColor::Yellow, FString::Printf(TEXT("Netmode = client")));
}
if (GetNetMode() == NM_ListenServer)
{
GEngine->AddOnScreenDebugMessage(-1, 3.0f, FColor::Yellow, FString::Printf(TEXT("Netmode = ListenServer")));
}
if (GetNetMode() == NM_DedicatedServer)
{
GEngine->AddOnScreenDebugMessage(-1, 3.0f, FColor::Yellow, FString::Printf(TEXT("Netmode = Dedicated")));
}*/```

i imagine as long as you have set the owner you can run rpcs, but you need to know if the client or server is the owner i guess, so those will help you figure it out..

[meager fable]

yup, it goes netmode = client

what the actual heck

[sweet marsh]

is the owner the client?

try spawning the item on the server and then setting the owner there

[amber raft]

Hi, is there a way to implement webcam video throught widget and make it visible in multiplayer for both players?

[thin stratus]

Eh, I can't say for sure, but my very first guess would be: Yes, but not without custom C++ code.

[harsh rock]

Hey, does anyone know why actor click events don't work after seamless travel?

also, is there a way to cleanup widgets before travelling

[thin stratus]

I usually use PreClientTravel for that

PlayerController function, C++

[harsh rock]

ohhh, I was looking for something like that

any idea about the click events not working?

I might have just figured that out

I changed something in the settings without testing it right away, I somehow disabled mouse input 🤦‍♂️

[old hamlet]

Hello, I have been looking for Good networking tutorials that are straight forward and are only blueprint no C++ needed

[peak sentinel]

https://youtu.be/TEojA3VBXG8 Dont forget to spam comments for part5 @old hamlet @shy aspen

[old hamlet]

lol Thanks ❤️

[novel bison]

Ok what am I missing

I'm setting a variable on the server, but it's not replicating to clients

variable is set to replicate, so is actor

it's only being set on server

but when it comes time for clients to read it .... None

reading here

i try calling this function on the server and it's fine, so setting is working

[harsh rock]

could it be a timing issue?

Also, I see you have that function set to run on the server, is it getting hit?

if it's not getting hit you probably have an authority issue

[novel bison]

yeah it's getting hit

thanks for the timing thing, part of it was that

now it's that the remote client's values aren't updating even thought they're set on the server

server has everything right, and each owning client has theirs correct

hmmmmm

[wheat magnet]

what it exact mean by "Run on Server" event?

[novel bison]

means it only runs on server

will not run on any client

[wheat magnet]

in my player state, when i run an event on server, does it run on only server?

from any client?

[hollow eagle]

It will run on the server if you are the owning client.

It will do nothing if you are not the owning client.

[wheat magnet]

what exact mean by owning client

for example, if i join the the server, then i will become owning client?

trying to understand this table

does RPC means the custom event?, for example "run on server" or "multicast" etc @hollow eagle

also can you explain this table

[hollow eagle]

https://cedric-neukirchen.net/Downloads/Compendium/UE4_Network_Compendium_by_Cedric_eXi_Neukirchen.pdf
Read page 8 and page 61 onward. If not the whole thing.

[shy aspen]

😂

[violet sentinel]

i guess lowered update frequency too much so it is delayed by a year

[torn solstice]

Hey guys, I got something that's been bothering me on and off for like 6 months or more now. Wondering if anyone here could help out or see something that I'm not.

Basically I've been working on an RTS where you can also be in third person; there is a fog of war that should hide any units that are outside of the teams vision. When playing standalone, it works fine. But when the Server has a client that is an enemy, a problem arises where the enemies units will be hidden completely or in this case they will jitter out of existence for a minute when the server changes camera, or when placing a new object it will jitter. This wasn't a problem for months, now it's returned. The visibility works off a non-replicated component that ticks every 1 second in order to send a client function towards the first found local controller, with checks for simulated or remote role simulated, ie Client or Listen Servers seeing the actor.

Basically the TLDR is that I'm wondering, does SetActorHiddenInGame called on the Server hide the actor for all clients, if so what would be a client relative variable or function I could use in order to produce the desired effect consistently. It's strange because I call the HiddenInGame function in a Client Function on the playercontroller, so I thought it would be client relative already but whenever the server is involved it seems to cause foolery.

[lime skiff]

Ran also in that error. The owner was present (APlayerController). However, the outer was indeed missing - it was intended to be replicated, but the client erroneously overwrote that (replicated) variable. Since in your case the RaevinInventoryEquipSlot is affected (and the owner actor is present), check if the outer of RaevinInventoryEquipSlot got invalidated on the client (like being overwritten with another object). From looking on your code example, you might be missing an if (HasAuthority()) check around the call of InventoryComponent = FindComponentByClass<URaevinPlayerInventoryComponent>(); etc.

[crystal crag]

Oh ok. Thanks for the tip. Wouldn't I need to set it both in the server and client though since it's a component in the bp class?

I don't think I'm replicating the component variable itself. Am I supposed to? I've never done that before for other components with the same type of setup

[elder sable]

What's the process when an online session is complete to start the game and load the map for all players ?

[crystal crag]

Are you using lobbies?

[calm bear]

I'm doing some dabbling in beginner multiplayer stuff, and I've come across a weird issue: I can set the game to five players (one server, four clients), and all the clients can move, but the server can't, like they're not even receiving input

[crystal crag]

Based off of this link https://docs.unrealengine.com/4.27/en-US/InteractiveExperiences/Networking/Actors/Components/

I would think that my inventory component would fall under the static category

because the component is being added under the BPs component list

so it will always be created by default

[elder sable]

Yep

I mean, the session interface with steam online subsystem

[crystal crag]

Would unreal insights help me with my issue?

@elder sableI haven't even shipped my first multiplayer title, so take what I say with a grain of salt, but I am not using lobbies and my design is to have the dedicated server set to run a specific map / mode and the clients would preload the map assets before actually making the official connection to the server's session

Though if you just have hard references to everything and are not using async loading / using the asset manager, then you can ignore the part about preloading the map assets ahead of time

[elder sable]

Ok, i will check

[crystal crag]

Have you looked at shooter game ?

[elder sable]

For sessions ? It's just for GAS no ?

[hollow eagle]

ShooterGame doesn't use GAS. GASShooter does. Which is irrelevant anyway.
ShooterGame has a full menu system that works as an example of how sessions are used.

[hallow fiber]

Does anybody know if UE5 has different networking from other versions cuz I am following a tutorial and I do not know if I am screwing up or if its different

Keep getting the error UNetDriver::ProcessRemoteFunction: No owning connection for actor BP_Door_C_1. Function OnRep_DoorOpen will not be processed

[hallow fiber]

I am calling that on the server and still getting the error

[elder sable]

Ah ok, will check that then thanks

[empty axle]

Most likely you are not the owner of the door bp so you have to route that RPC through something that you own (PlayerController, Character etc)

[hallow fiber]

I am currently calling the door through my character on the server

Is that correct?

[empty axle]

the RPC is on your character right?

[hallow fiber]

Yeah

I'm downgrading to 4.27 to see if it changes anything

[empty axle]

then that should work

[hallow fiber]

Yeah, I am literally following this tutorial 1 to 1 and it is not working

I have watched it like 10 times now

I tried setting the owner of the door to self every RPC call and that worked but that doesn't seem like the correct way to do it

[empty axle]

you could try to move that RPC to playerController, maybe you have some custom character creation and the owner is not set properly

[hallow fiber]

How would that happen?

Maybe I will try that after this

[empty axle]

Are you relying on the way UE spawns characters or you are doing it manually?

[hallow fiber]

I created my own custom ACharacter

But it is a child of ACharacter

[empty axle]

and you just placed it in the world settings right?

[hallow fiber]

Oh spawning, yeah I am just using standard UE spawns

[hallow fiber]

Im using the player start

[empty axle]

and you set it here?

or in the project settings ?

[hallow fiber]

Uhhh

Lemme see

Im doing it in project settings

Neither way seems to be working, either overriding the World Settings or in Project Settings

[empty axle]

maybe show the code where you call it

[hallow fiber]

Im just gonna copy paste the relevant code in the chat

void AFPCharacter::Interact()
{
FHitResult HitResult;
const FVector Start = Camera->GetComponentLocation();
const FVector End = Start + Camera->GetComponentRotation().Vector() * InteractDistance;
const bool bHit = GetWorld()->LineTraceSingleByChannel(HitResult, Start, End, ECC_Visibility);
DrawDebugLine(GetWorld(), Start, bHit ? HitResult.Location : End, bHit ? FColor::Green : FColor::Red, false, 5.f);
if(bHit)
{
if(HitResult.GetActor() && HitResult.GetActor()->Implements<UInteractInterface>())
{
if(HasAuthority())
{
if(auto* InteractInterface = Cast<IInteractInterface>(HitResult.GetActor()))
InteractInterface->Interact(this);
}
else
{
Server_Interact(HitResult.GetActor());
}
}
}
}

void AFPCharacter::Server_Interact_Implementation(UObject* Object)
{
if(auto* InteractInterface = Cast<IInteractInterface>(Object))
InteractInterface->Interact(this);
}

The door implements the Interact Interface

[empty axle]

Looks totally fine

[hallow fiber]

Yeah, I'm copying and pasting everything to 4.27 and seeing what that does

[empty axle]

Do you have some code related to character spawning?

[hallow fiber]

No

Just using the default spawning

[empty axle]

looking at the actual error it's not the server rpc that does not work but OnRep_DoorOpen

that shouldn't be RPC

[hallow fiber]

Really?

Do you not need to call on the server when changing a Replicated variable?

[empty axle]

no

it's called automatically client-side when the variable replicates to you

[hallow fiber]

Huh

I'll try that out

Should it really give me errors though anyways?

I followed a tutorial

[empty axle]

OnReps are never RPCs

[hallow fiber]

Okay

Im gonna see if that fixes it

I read online somewhere that you still need to call it on the server when changing a replicated variable but idk

[empty axle]

UPROPERTY(ReplicatedUsing = OnRep_DoorOpen )
bool bDoorOpen;

UFUNCTION()
void OnRep_DoorOpen();

Actor needs to be replicated and you need to override GetLifetimeReplicatedProps. That's all

Then you just change that bool server-side

[hallow fiber]

Still doesnt seem to work

You say change the bool server-side. Do you mean call an RPC in the door or call an RPC on the Character like I did

[hallow fiber]

I am using that and I have DOREPLIFETIME(ADoor, bDoorIsOpen);

When I removed the RPC on the character and just had a client change the bool it is still giving me the same message

[empty axle]

Calling RPC in the door will not work as they are most likely placed in the level so you are not the owner of it

so who calls OnRep_DoorOpen?

[hallow fiber]

Who calls it? It gets called when the variable is changed right?

void ADoor::Interact(AFPCharacter* Character)
{
//if(HasAuthority())
{
bDoorOpen = !bDoorOpen;
OnRep_DoorOpen();
}
}

This is all interact does

[empty axle]

so you call it

[hallow fiber]

Then it calls the OnRep_DoorOpen_Implementation but instead it gives me the error

Yeah

[empty axle]

AFPCharacter::Server_Interact this has UFUNCTION(Server) above?

[hallow fiber]

When I revert it back to how I had it it actually does work for the server but the OnRep function is not being called on the clients (it works cuz I explicitly call OnRep_DoorOpen() for the server)

Yeah

UFUNCTION(Server, Reliable)

What does reliable do? I heard it makes it so it is always called

[empty axle]

then it was probably not replicating to clients at all

[empty axle]

it makes sure the RPC reaches destination

[hallow fiber]

Yeah, that's the issue

[hallow fiber]

@empty axle Downgrading didnt help...

[empty axle]

the doors are set to replicate? If yes then it might be hard to help without seeing more of your code

[hallow fiber]

They are

I might try calling on the controller but I dont want to have to implement every RPC ever that interacts with an AActor on the controller...

When I change the replicated variable bDoorIsOpen on the client the OnRep function isnt called at all and when I do it on the server I get errors and the function isnt called

[empty axle]

the OnRep will not be called if you change it on the client-side
you don't have to call it on the server unless you want to do execute the code from OnRep server side

[hallow fiber]

Doesnt OnRep get called on all clients?

[empty axle]

its called automatically client-side when replicated variable changes

its called on all clients

[hallow fiber]

Calling from the Controller did not work

[meager fable]

I have:

    UFUNCTION(Server, Unreliable)
    virtual void SendState_Server(const FTransformNoScaleNetState& State);

void AMyActor::SendState_Server_Implementation(const FTransformNoScaleNetState& State)
{
    if (GetLocalRole() == ROLE_Authority)
    {
        GEngine->AddOnScreenDebugMessage(-1, 3.0f, FColor::Green, FString::Printf(TEXT("Local = authority")));
    }
    else if (GetLocalRole() == ROLE_SimulatedProxy)
    {
        GEngine->AddOnScreenDebugMessage(-1, 3.0f, FColor::Green, FString::Printf(TEXT("Local = simulated")));
    }
    else if (GetLocalRole() == ROLE_AutonomousProxy)
    {
        GEngine->AddOnScreenDebugMessage(-1, 3.0f, FColor::Green, FString::Printf(TEXT("Local = autonomous")));
    }
    
    if (GetNetMode() == NM_Client)
    {
        GEngine->AddOnScreenDebugMessage(-1, 3.0f, FColor::Yellow, FString::Printf(TEXT("Netmode = client")));
    }
    else if (GetNetMode() == NM_ListenServer)
    {
        GEngine->AddOnScreenDebugMessage(-1, 3.0f, FColor::Yellow, FString::Printf(TEXT("Netmode = ListenServer")));
    }
    else if (GetNetMode() == NM_DedicatedServer)
    {
        GEngine->AddOnScreenDebugMessage(-1, 3.0f, FColor::Yellow, FString::Printf(TEXT("Netmode = Dedicated")));
    }
    
    auto Owner = Cast<APawn>(GetOwner());
    GEngine->AddOnScreenDebugMessage(-1, 3.0f, FColor::Yellow, FString::FromInt(Owner->IsLocallyControlled()));
}

That prints out that my net mode = client and my local role is simulated. Also my Pawn is locally controlled. How is it possible that a server rpc runs on the client when I have an owning connection?

According to the docs it can either get dropped or run on the server

but somehow this runs on the client

also in derived blueprints I use RPC's and they work

[hallow fiber]

@empty axle Okay, I'm an idiot. The issue was I set the OnRep function to UFUNCTION(Server) but I want that information passed to the clients so I needed to set it to UFUNCTION(Client) and I no longer got the errors and I think it works properly now

The tutorial I watched made it a server RPC for the door and idk how that worked for him

[empty axle]

OnRep should never have those specifiers that you mentioned

it should be plain UFUNCTION()

as I posted

[hallow fiber]

I believe the person in the tutorial I watched put UFUNCTION(Server) but I will have to double check

YEah, thats the issue.

[empty axle]

quality of some tutorials on youtube is crap, even the epic ones

[hallow fiber]

Thats probably right, I thought it was kinda strange but I assumed thats just how it is

Yup, everything seems to work perfectly now, that was really dumb of me

[sweet marsh]

Hi guys, has anyone had any issues with the destructibles not breaking on a client this is using the old collision system not chaos?

for the life of me i can't get it to work, the server applies the damage but the item does not break on the client

a multicast crashes the game so i'm assuming the item is already destroyed by the time the client tries to apply the effect, works fine in the editor and crashes in a packaged build

I think that there is a bug somewhere here as the item runs all the other code runs in the function but the destructible just disappears on the client without breaking

[little bloom]

I've packaged and tested a dedicated server in the development configuration, but when in shipping, the server window launches with -log, but is entirely blank. Any tips?

[violet sentinel]

shipping does not have logs by default. you have to enable it in UE4Game.Target and YourGame target

[little bloom]

Alright, thanks!

[violet sentinel]

bUseLoggingInShipping

[amber raft]

Can anyone help me? I was trying to make a widget with user webcams for multiplayer... I can visualize the one of my "host" but it doesn't display that on the other clients, and clients can't show their camera.

followed this for webcam bp

[violet sentinel]

they exist only locally, if you want to share others you need somehow restream the data from client to host and host to every client

and it goes a bit outside of regular data transfer model

[amber raft]

so isn't it possible?

[bitter oriole]

Sure, you just need to build yourself Zoom inside Unreal

[amber raft]

😫 there's something anywhere? A guide/tutorial/some hints?

[bitter oriole]

Doubtful

Did you ever see a game with multiplayer video ?

Usually tutorials are for popular and widely documented gameplay systems

Video streaming is not exactly simple

[amber raft]

And if i stream it like a texture? It's the same?

[bitter oriole]

If you want one frame per second

If you want real-time video you really do need video streaming

[amber raft]

so i need to start developing from zoom sdk in c++?

[violet sentinel]

that technically could work but i'm not sure about possible licensing issues

Developers can sign up and get 10,000 minutes per month to play with for free

[amber raft]

okay so if i need to publish the project i need to get a license from them right? idk maybe i'll not publish.. for now it's just a thesis project

[violet sentinel]

well, worth trying. seems interesting research

[bitter oriole]

What I'm saying is more that this is probably months of difficult C++ work

[peak sentinel]

I've been following ShooterGame example for weapons (on HandleFiring client and server starts a timer together to loop the firing logic), but today I realized since HandleStopFiring sends a RPC to server to stop the timer, due to latency server always fires a little more bullets and this causes mismatch of consumed ammo between server and client. Anyone knows an alternative logic? Any workaround is not fitting to my weapon system since I use pooled projectiles and create each projectile locally on clients via an OnRep

[violet sentinel]

i made it stop locally early and send rpc

[harsh rock]

this is for some sort of machine gun, correct?

[peak sentinel]

Yes

[peak sentinel]

I stop locally too, but for example when local client hits 0 ammo on primary clips, weapon tries to reload automatically. Since StopFiring RPC takes time until its arrive to server server keeps firing and while client needs 20 ammo server can require 25 ammo to fulfill the clip

I need to pass how many ammo I need via server RPC to guarantee both will reload same amount of ammo, thats okay since I'm not using dedi servers but I'm wondering if there is any other way since its not a good practice

In the end sending required ammo with server RPCs is letting client decide it

[violet sentinel]

that looks like some very fast firing weapon

[peak sentinel]

0.1s fire rate

[harsh rock]

yeah, that could cause some lag, lol

[violet sentinel]

my weapon ammo comes each time from server so i don't bother if server used one or two extra bullets

since server anyway already did those 2 extra shots

no way to rollback them

[harsh rock]

yes, ammo should be replicated from the server, not client

[peak sentinel]

For simulated proxies its a little bit lossy with average network conditions, but since I'm using Burst Counter pattern and using local spawned pool only integer replication uses bandwith

[harsh rock]

also, each shot should be an rpc

[peak sentinel]

So you send a server rpc to notify you're stopped firing and send a client rpc to notify how manny ammo to reload, right?

[harsh rock]

I believe

[peak sentinel]

Each shot can be RPC, I saw some people mention it around here and forums but I'm just not sure anyone else send RPC with 0.1s of fire rate too

I thought about using RPCs too

Just trying to avoid it unless its the only chance, since I guess each shot should be reliable?

[harsh rock]

I mean, as long as you're not calling rpcs in event tick every frame, it should be fine

also, if you mark it as unreliable it would probably be better for firing such a fast rate

that way if an rpc doesn't make it no problem

could be faster

[peak sentinel]

Alright, thanks for the insigths, I'll consider them

[harsh rock]

if you do go the RPC per shot route, I'd validate time between shots, that way someone couldn't hack it

[amber raft]

and with webrtc?

[grand stratus]

guys what happen to game mode after seamless travel

does variables in my custom gamemode reset?

[meager spade]

yes

[grand stratus]

how can i copy it

[meager spade]

you cant

you store persistent stuff in like a GameInstance

[grand stratus]

so if i have a num of impsters variables in game state

i need to save it in game instance

[meager spade]

you could make a special actor based on AINfo

that gets dragged in via Seamless travel and not destroyed

that holds this stuff

we have a MissionSetupActor that we drag from the Strategy Layer into the Combat Layer

via seamless travel

you can override GetSeamlessTravelActorList and add your special actor to the ActorList.

[graceful flame]

In a 5vs5 FPS game with randomly assigned teams where would you place the logic that assigns teams and stores team variables?
GameMode
GameState
PlayerState
PlayerController
Character
All of the above?

[rich locust]

I would go for gamestate if you intend to share this information

[graceful flame]

Okay great, I already have most of the team stuff in there already, I'm starting to wrap my head around things a bit more but still have these moments when it all just seems so strange all of a sudden.

[violet sentinel]

game mode to assign teams, manage spawn points etc
game state to store match data
player state to store player data

UT for example has a separate actor for team information

can be just replicated subobject of game state

[graceful flame]

So in my game so far the user flows like this: Main menu (standalone) >>> Host / join lobby (server/client) >>> more clients join (client) >>> map vote finished >>> open level arena_1 (game mode changes). Here at this exact moment I need to know when all of the clients have finished loading before I can assign teams, but I'm not sure how to check for that.

Would I just add a bool hasLoaded to the player controller and have it set something in the gamestate?

[rich locust]

Easiest aproach would be if you dont intend to show progress is. Store how many players have been there when open level changed on the host`s gameinstance. And make a 5 sec to check if current players meets the number given

[graceful flame]

Should also mention that I'm changing Player Controllers as well as game mode

[rich locust]

And also make a timeout time as well

[acoustic egret]

Hi !
I'm having a weird issue since a few days that I can't resolve so any help will be really appreciated ^^
I have a pretty simple ragdoll system that works well in offline mode and server mode
But I have problems when it comes to the clients...
In the video, 1st config, mesh is not synched with the capsule
2nd config, everything is synched as it should be, but the mesh isn't going radgoll...
Any idea ? tips ?
(sorry for my english, not my first language)
https://youtu.be/NoMqH8-zUmU

[thin stratus]

I don't know the answer to that problem, but one thing is for sure: You don't want to use RPCs for this

Being Ragdoll or not is a State change

RepNotify variables are used for that

you only want to set a boolean "IsRagdolling" and then in the OnRep of that do your code based on the boolean

[acoustic egret]

so if I get it, I should set a RepNotify boolean variable (IsRagdolling) to true when i want to ragdoll, and false when i want to get up ?
But how can I get the bolean value from the repnotify function?

[violet sentinel]

UPROPERTY(ReplicatedUsing=OnRep_Ragdolling) 
bool bIsRagdolling; 
UFUNCTION()
void OnRep_Ragdolling() {
   if (bIsRagdolling) apply ragdoll
   else disable ragdoll
}  

same in blueprints

just set variable to RepNotify, it will create onrep method

[acoustic egret]

how can i get the boolean value from the method ? i just can set it (i'm using BP)

well sry, i just got it, I'l try this thanks !

I have pretty much the same result, working on server, weird stuff on client :/

Maybe it comes from this part of code ?
Here (event tick) i stick the capsule to the mesh
It works on offline, server but for the clients it's out of synch and the mesh can go far away from the capsule
If I remove the switch, the client overrides the mesh position so I dont really know how to handle this

[wheat magnet]

very basic question

why this showing player array NULL in client side?

but on server side, it is showing correct

i'm adding this widget inside HUD class, on begin play

it should displayer all players name in lobby?

[sinful tree]

Possibly that your gamestate hasn't replicated before this widget is being constructed?

[wheat magnet]

how i can make my game state replicated?

i already have correct game state assigned in game mode

[sinful tree]

Game state is already set to replicate.... The thing is, is this widget construction being called on begin play somewhere? It may be getting constructed before game state has had the chance to replicate to your client.

[wheat magnet]

this is where i'm adding this widget

it is inside HUD class on begin play

[twilit radish]

Your HUD is probably being initialised before the GameState has had the chance to replicate all data from it self to that client.

Which is I think what Datura is also trying to say.

[wheat magnet]

should adding delay on begin play

[granite plume]

Hey all. I'm a beginner UE dev, and I'm trying to figure out the best solution to my use case: I want a specific player to authoritatively modify an Actor's state from their local client, as well as broadcast RPCs to all other players. I want to make sure I've got the following right:

• For Actor state, I would want to set everything to autonomous proxy so it keeps my local changes immediately, but replicates to all other clients through the server.

• For RPCs, I'm going to need to first send an RPC to the server, then have the server Multicast a new RPC to all players, and ignore my own looped back RPC. Ideally, I could just say "multicast to everyone but me", but that's not a feature AFAIK.

[twilit radish]

Delays are in general bad practice, for all you know it still hasn't been initialised at that point because someone has a crappy connection.

[wheat magnet]

so what should i do

to fix this completety

[wheat magnet]

what exact mean by this

adding delay is fixed the issue

but i need reliable solution

maybe run timer function on event construct

to check validity

ok thanks for help, you've fixed my issue

[twilit radish]

👍
I'm going to look a bit further though because I don't immediately see a way where you can get notified with changes 🤔

[wheat magnet]

Great thank you!

[granite plume]

Re: my above question, am I overthinking this? Will ownership of an actor automatically update locally without the server roundtrip for replicated state? I think RPCs will still need to do a 2-step broadcast though.

[twilit radish]

Depends on what you want I guess? Usually you don't have much authority if a client just tells the server to 'change this thing', but depends on what it is I guess. But yes you would RPC up to the server to tell the server to change it and then could indeed multicast to set it on everyone, or alternatively replicate it to clients but that again depends.

And about the role still not entirely sure what you want to do, but this is what according to Unreal it should be used for:

Autonomous Proxy

The Actor is a remote proxy that is capable of performing some functions locally, but receives corrections from an authoritative Actor. Autonomous Proxy is usually reserved for Actors under the direct control of a player, like Pawns.

Maybe a bit more context on what you want to achieve would help 😛

[proven fog]

I keep getting Warning: Travel Failure: [InvalidURL]: Invalid URL: /Game/Maps/MainMenuMap when running open localhost:7777. The server is running a map /Game/Map/Main

[twilit radish]

I think I figured out how to get instant changes from the PlayerArray, but I think it's only C++. You have to override a C++ function from what I see.

[proven fog]

The client default map is /Game/Maps/MainMenuMap, which loads successfully upon launching the game. It doesn't make any sense.

[granite plume]

@twilit radish Here's something more concrete (but totally made up): I have a robotic TV head in my game that my player owns and controls. It can rotate on the Z up axis, and show really simple images on an 8x8 display of colored lights. On my client, I want to control its heading, and what it shows on its screen. But I want it to feel absolutely instantaneous for me. Let's say the data for it's screen may change on a per-frame basis.

So, I think I'd want to replicate the head as a autonomous proxy property (I own it, and want local update), and I'd send the 64bits of screen state via reliable RPC, because maybe it has state that needs to be stored, and recalled later, but it can't be lossy.

[twilit radish]

Dedicated server? If so maybe the map failed to load, I've seen quite commonly the problem that you need to include the map somewhere 🙂

[twilit radish]

Then yes, I would make the client the owner of the specific actor and send an RPC with whatever you want to change up to the server. I would however not make it reliable if it can run as often as a tick, seems like a good way to fill up your networking queue. About giving it the role, not entirely sure. I would also just let the server replicate it down to other clients as that gives the ability to exclude the owner and not saturate your bandwidth more than it needs to, unless it's really important for it to be an RPC 🤷‍♀️

Just be careful that if you do care about cheats obviously the client could send whatever it want, but that's up to you 🙂

[granite plume]

Understood on the cheating! This is only superficial, not tied to game play.

What is the highest message frequency and bandwidth you'd recommend for sending RPCs?

[twilit radish]

I don't think there's a good answer to that, it depends on how much you can spare and obviously how much data you send. If you're sending a ton of large data it may be better to not do it extremely often. If you're for example on mobile you will probably want to save as much as you can, although obviously it's also nice for PC etc. but IMO unless you already use a lot of bandwidth I don't think you have to be as strict about it.

I would say look at how important it really is in your game, you said it's not tied to gameplay so I don't think it should be updated more often than gameplay features but not so little it just may as well not be there. Obviously if you do run into issues or if you have a limit for your project you could tweak these things.

[granite plume]

Thanks @twilit radish !

[dark edge]

A client cannot multicast to other clients. Everything goes through the server. What's the design intent, what mechanic are you trying to accomplish here?

[proven fog]

I can't connect to my dedicated server running on my machine. It isn't giving me any errors, other than timing out. I have no idea where to start.

This couldn't be any more confusing.

It worked when I had it deployed on GameLift.

[granite plume]

@dark edge Let me try to simplify the hypothetical use case. Let's say (for whatever reason) I want to broadcast an arbitrary time series of structs of data to other clients, so they could retain all of them, and use as necessary. They need to receive everything (reliable), but they may not use them right now, which means they can't be mere replicated properties. The server logic has granted my player as the generator of this data, and that may change in the future.

[south terrace]

Is there a way to show full servers in server browser ? I am using advanced sessions and if the server is full the other clients don't see the server in server list

[sinful tree]

Does the player have something specific that they absolutely must do on their client that the server could not do and then broadcast those values to clients as necessary?

For example, the client can still supply some numbers to the server, and then server sends those values to the clients.

[granite plume]

That's totally fine. I assumed this would require RPC from client->server, then multicast to other clients, but with the generator client ignoring it. I'm looking for a better way than that (e.g., being able to selectively blacklist one of the clients in a multicast RPC call).

[sinful tree]

Sounds like a job for gamestate with a rep notify variable holding your data structure, and playerstate with a replicated boolean.

Player sends data to server > server does whatever it needs to > sets the replicated variable values > clients receive rep notify, "generator" player ignores by checking if they are the generator > other clients do what they need to with the replicated data.

[granite plume]

Maybe a version int instead of a boolean, so you're just looking for an interative change, and it doesn't have to reset anything? You can also detect whether you missed a version of data.

On that note, this seems like it would be easy to miss versions of the data. One of the requirements is we get all data sent, not just latest. Er, that is, not backward in time--just from the point you joined.

[sinful tree]

You can still have your clients store the data in a client-side variable once it is received.

or array what have you.

[granite plume]

You mean by polling it and pushing it in on the receiver client side? The problem I see is that it may change from the server between client updates, because things aren't in lock step. The generator client may be at a higher frame rate than the other clients. It's basically sample aliasing for the reader.

[sinful tree]

If you're trying to multicast data at frame-rate level speeds, you're going to have a bad time.

What I'm saying is when you have a value that needs to change from the generator, you let the generator tell the server what that value is. The server then replicates that value to the clients. When the clients receive it, they can store the value in their own array of values.

[granite plume]

That is a good point. Maybe I'm overthinking this. If I can limit updates to something chunky like 5Hz, polling should work fine.

[granite plume]

Oh, by setting it to be replicated with an OnChanged callback? (not sure of the proper term in UE)

[sinful tree]

OnRep, yes, that was one way... If you want to do RPC, that's fine too. You can even pass a version value through the RPC, then have a map variable on the clients to store each version and be able to look it up based on the version number.

[granite plume]

An advantage of doing this as properties is that I don't suffer the cost of the server sending the data back to the generator, which is wasted bandwidth. It should only send the replicated property change to the other clients, right?

In addition, properties are delta encoded, whereas RPCs are full data, right? Nm, I can custom NetSerialize the USTRUCTs if I have to.

[sinful tree]

An example logic... Not sure about your last question - RPCs set to execute on all will run on all clients so long as the actor exists on all clients (eg. gamestate, or playerstate or their characters so long as they are relevant). OnRep variables are similar. It'll replicate to all if it is something they have access to and is relevant to them.

[acoustic egret]

Any idea ? I tried to replicate a transform variable for the last ragdoll position but it doesn't work (or i'm doing it wrong)

[granite plume]

This is very clear. Thanks!

[spark owl]

what should I do if a replicated movement physics object is teleporting slightly/flickering position/rubber banding. It seems to happen less with high ping players, and happen more often with low ping players.

[dark edge]

Have you touched the physics replication settings at all?

[spark owl]

i think i have the rotation and location set to be two decimals

and also i turned down tick rate to 30 ticks per second

it seemed to help keep it stable

[dark edge]

There are a lot more settings than that, look into the actual physics replication settings

[spark owl]

ok i will launch up the editor and take a look 1 moment

[spark owl]

is there anything specific I should be looking for?

that is physics settings of the static mesh, it's the root component

this is replication settings

https://streamable.com/e4qudl

also just to be clear this is exactly what is happening

you can see slight stuttering in the ball occasionally

[dark edge]

@spark owlThis stuff

[spark owl]

I haven't touched any of that, it's all default

[ebon plume]

Where can I read up on the dedicated server system specs (requirements) I will need for a single instance of my game that's being hosted with (x) amount of players?

Is there something in Unreal ? Like a profiler or tools to help figure the server side requirements ?

[eternal canyon]

those are corrections

probably for a variety of reasons

[spark owl]

such as?

[eternal canyon]

non deterministic physics, and with that issues when reviewing data from the server when the server thinks the physics object is moving and so does the client, and probably more but I cant see the video that u sent

[spark owl]

any idea how to stop or at least reduce it?

[eternal canyon]

for the second one, i would need to actually face the problem

and for thge first one in ue5 they have some new options to make the physics a little more deterministic with the new physics engine

but it isnt fully deterministic because floats being calculated differently on different cpu's im pretty sure

[calm bear]

I wanted to make sure of something: is it best practice to make an event run on a server, and then immediately have that event run on client as well? Like, say:

https://i.gyazo.com/3a4e8de6b192c80c013313b6af92ccbf.png

It strikes me as redundant, but that might just be because I'm new to this side of gamedev in general

I've been slightly following this tutorial video combined with an altered First Person unreal template

https://www.youtube.com/watch?v=GcZQ2o6LpDI

[severe widget]

typically you want an action to occur on the autonomous client as well as the server. Then, the corrections from the server will be less severe, and you're able to run visuals as soon as a thing "should happen" as opposed to when the server tells you they happen.

The difference between running logic on the server only or doing it on both will not be apparent in PIE. but you can look into net emulation to simulate packet lag/loss.

[calm bear]

That makes sense! I was wondering if there was a better way to do it than the way I am now, like instead of choosing 'Run on Server' or 'Run on Client' and then having to manually connect the input to the event it's calling, I could somehow choose 'Run on Client and Server' and keep things visually separate

I haven't yet encountered any situations in which it'd be useful to run an event only on the server

[severe widget]

Oh. I see, like a way to visually structure this and do some code only on certain roles

Not out of the box, but you can find a pattern of calls you like and just use those all over the place. Anything more sophisticated along those lines would involve serious lifting in C++

[calm bear]

Ok! I definitely think I'll be diving into C++ eventually

For now I'm still getting my bearings with Unreal in general, the only program I've got experience with otherwise is GMS2

[glass vector]

how does attachment replication work? if I attach and weld the root of a child actor to the root of the parent actor, does the act of attaching get replicated? (ie, welding of bodies is replicated)

[peak sentinel]

Anyone knows how can we disable this log 😦

I need to set variable directly

Because Epic made the bReplicated made protected and I can only use SetReplicated() function

And I'm spawning actors for a pool and deferred spawning

[silent valley]

Why not make BP_Projectile Replicated in the class defaults?

[peak sentinel]

I'm still setting it again to true or false again inside the pool's initialize function

I decide to replicate spawned actors in the pool's subsystem

Sometimes only server needs to replicate such things etc.

Sorry btw I made a mistake, I need to set bReplicate variable directly, I'm using SetReplicated instead

[hollow eagle]

<@&213101288538374145> ^

[nimble parcel]

:no_entry_sign: Maximilianmus#2509 was banned.

[severe axle]

Hello everyone. I have a question regarding function replication in C++. So I have a function, which modifies boolean variable, which I then use in AnimBP. I want to call that function on both client and server (I don't want any lags, so the variable I modify has COND_SkipOwner tag). The problem is, that I need to create a separate function, which will be called on the server. So, I have 2 functions: 1 is called on the client, and another one - on the server. But this means, every time I want to replicate a client only function, I'll have to create func for the server. Is this the right way of doing replication? I'm afraid there would be too many functions, doing basically the same thing.

[thin stratus]

In that case you usually have a function called
void ASomeActor::SomeFunction() which does your logic

And then void ASomeActor::ServerSomeFunction() which just calls SomeFunction

void ASomeActor::SomeFunction()
{
  if (IsLocallyControlled() && !IsServer())
  {
    ServerSomeFunction();
  }

  bSomeBoolean = true;
}

void ASomeActor::ServerSomeFunction_Implementation()
{
  SomeFunction();
}

Something like that

IsLocallyControlled() and IsServer() are just pseudo code though

[severe axle]

@thin stratus This is the way I needed, clean and simple. Thanks a lot. But why did you call that condition a pseudo code?

[thin stratus]

IsLocallyControlled is an APawn function iirc

So if that's some other actor that is owned by the Player (which it needs to anyway for RPCs), then that function might not exist or you have to figure out the locally owned stuff via the Owner of the actor

[potent dagger]

What is best practice for testing Steam Multiplayer? A second Steam account run on a seperate computer?

[acoustic egret]

Hey guys, any idea on how to fix this client issue ? I'm stuck since a few days on this sh*t 😢
I tried RPC's, repNotify, ... i'm just lost now
(everything is fine on server/offline, but mesh is out of sync on client)
https://youtu.be/Fevt5ciJCmY

[severe axle]

K, understood. Thank you 👍

[sinful tree]

It will pretty much always be as physics isn't replicated but simulated separately on every client and server.

[severe widget]

You'll need to make a wrapper function that directly modifies that variable. If you can't set it from BP, then live with the warning

[acoustic egret]

so should I make a 'ragdoll animation' instead of just 'ragdolling' just to keep it replicated ? there is no way for the server to handle meshes positions ? or just keep every character mesh in its own capsule ?

or maybe make a transform of a bone and replicate it

[acoustic egret]

anyone?

[twin juniper]

Hello guys, i did a simple matchmaking system that you find a server if there's not any then it creates one, where you wait for players to start (battle royale).

Now i want to add as default that you need teams of 3, so, i would like that when you try to find a match solo it would match up with 2 random players that are also solo. And, steam invite + menu player pods. Is there any tutorial or anyone that can help me out with it? Im a student learning for a university project

[sick frigate]

Could anyone offer a clean readable way to reduce the per frame network cost of replicating an axis on a joystick? Guess i'm looking to poll the axis instead of using the axis output per frame

any tips much appreicated

maybe a delay node is enough?

[bitter oriole]

I don't get how a delay node could alleviate network bandwidth

If you truly need to replicate an axis, it's okay to do so

Make sure it's Unreliable and that's it

[thin forge]

But doesnt a listen server act as both a server and client?

[bitter oriole]

And it shouldn't change much to the game

[crystal crag]

Ok, so my issue has become even more strange with the initial crash saying that the sub object's outer has not yet been replicated

it only does it once it would seem on initial play after loading the editor

if I am debugging and hit F5, the editor doesn't crash, and I can continue to play the game just fine

if I click stop and then start up a new dedicated server / PIE session, running as a standalone for the PIE client, then it doesn't hit that ensure breakpoint again

and my inventory loads just fine

still testing to see if that keeps happening consistently, but it is looking pretty consistent so far.

if something was getting replicated out of order... then I would think that it should always crash

or always fails that ensure at leasrt

I'm not using any static variables. I have avoided them on purpose to avoid weird PIE issues and just because I haven't really needed to use one yet.

[crystal crag]

It just makes zero sense. I changed the logic to not modify the inventory until the OnRep_PlayerState is called on the controller, which in turn fires off a server RPC to switch a flag to true, and only then is the inventory touched

still fails on that ensure

if (!ensureMsgf(ObjOuter != nullptr, TEXT("UActorChannel::ReadContentBlockHeader: Unable to serialize subobject's outer. Ensure that subobjects are replicated top-down, so outers are received first. Class: %s, Actor: %s"), *GetNameSafe(SubObjClass), *GetNameSafe(Actor)))
            {
                return nullptr;
            }

[worldly hollow]

I have a general question about using Physics in Unreal's Networking System. Could a project that uses Physics Linear Velocity be converted into a multiplayer game? The ***Landscape Mountains ***Example project has a Glider that feels fantastic...But not sure if it could work as smoothly in a multiplayer game... for idk 30 players? Or would this be too heavy on the Server?

Blueprintue-Code:
https://blueprintue.com/blueprint/t3dze1gm/

[dark edge]

Replicated physics works decently well, but if you need local prediction, you are going to have a ton of work ahead of you.

So if you are okay with ping time delay between your inputs and the physics responding, then it's fairly easy.

[worldly hollow]

Hmm it depends on drastic the delay is but I guess that depends on how bad your ping is 😅 Just trying to thing on how I'd go about creating a Glider and how physics-based is should be ... People have suggested to fake it but physics just feels so good : /

[dark edge]

Glider would be easy, not a whole lot of transients in a glider. Something like Rocket League is much trickier.

[spark owl]

do you have any recommendation for which of these settings I should play around with?

[dark edge]

Just wrap your head around what they do and get the settings as loose as you can while still being good enough for your application.

[spark owl]

ok i've changed a few of them, but just wanted to see if you had any particular 1 you could think of for the issue i'm having. Thank you for the help.

[crystal crag]

Ok, so I think I finally figured out the problem, but I really don't understand how it ever worked in the first place

[dark edge]

Mess with the error per linear and per angle, and try give it some linear lerp

[crystal crag]

My inventory system is an actor that doesn't load on the client. The UObjects being replicated are owned by the inventory system. So when the inventory item objects were replicated to the client, of course it couldn't find the outer, because the inventory system doesn't replicate or exist on the client

So... not sure how it has been running since last year without running into this issue until about a week ago now

[dark edge]

@crystal crag Why are they UObjects and not just structs?

[crystal crag]

Because different inventory items have different properties and I really despise being forced to stick every possible property into one structure.

[dark edge]

What does your savegame look like then?

[crystal crag]

I am developing a back end service that saves the state

I don't use save game

[meager spade]

i like SaveGame

[violet sentinel]

objects can have methods, and be passed by pointer. easier to replicate big changes (after initial setup)

[meager spade]

i store the InventoryActor itself 😛

[dark edge]

Which approach would you guys suggest for an inventory and item system that leverages guids for items?

[crystal crag]

By God, kaosapectrum is finally spotted in the wild

[dark edge]

That is, being able to uniquely refer to a single item instance

[crystal crag]

I use structures for a lot of things. But for inventory items, I use uobjects.

[violet sentinel]

if you want to nicely work with single item (like add a delegate or extra state) then objects

all you need is implement 4 items in item base class and 2 methods in inventory container

https://jambax.co.uk/replicating-uobjects/

[crystal crag]

Would save game really even work well for a game that requires players to traverse different dedicated servers, which are not even on the same physical host?

I would think you would want a database driving all player state

Not that the the dedicated server directly connects t o the database, but it ultimately gets there

[violet sentinel]

then dedicated servers would be world servers connected to data server

[crystal crag]

Right

well, not directly in my design, but yes.

Does anyone know how long the player state instance sticks around if a player disconnects from the session?

I'm thinking more along the lines of the client loses network connectivity, the game crashes, etc.

[sinful tree]

Not sure of duration, but you have several events you can latch on to (such as APlayerController::Destroyed() )before it gets destroyed so that you can store any needed data about the playerstate, even temporarily on the server before writing to database or repopulating the data back into another playerstate if the player reconnects, so long as you can properly associate the data back to the correct player of course.

[glad sedge]

Wrapping my head around something, so forgive the q

But updating variables (velocity, health etc) on simulated proxy from server - what's the reason for that, say, over just the server doing the update and replicating to all clients?

[sinful tundra]

Hey again, got another question: I'm trying to use seamless travel and whenever I servertravel to the final map, both the host and client's controllers seem to not get created or something? (since I'm getting null invalid checks). I thought they were supposed to persist during travel. Seamless travel is on, I have a transition map, and only the server is calling the servertravel on a custom playercontroller. (Everything is done in blueprints btw). All maps involved for the travel have the same game mode override settings.

And run under one process is false and is set to standalone for the play settings.

[potent dagger]

Anyone have a good resource for changing host on the fly? Like, if host disconnects, random client becomes host. Is it possible?

[sand iris]

Is it true that SetReplicateMovement() has to be called in BeginPlay and not the actor's constructor?

I heard that in a video but there was no explanation as to why that is so if someone could explain that would be great

Is it because, by default, it gets set to true after the constructor but before BeginPlay?

[sick frigate]

because it polls by ignoring execution between its delay. Unreliable is not an option for us

[bitter oriole]

What's wrong with unreliable ?

[wind scarab]

You want people to test hack your ue4 game?

if so I can help you with that

Ahh, if you ever need help feel free to dm me, and gl on your progress 👌

I have a ton of ideas just like that myself haha

[slim nebula]

Is there any way to move an actor whose local role is ROLE_SimulatedProxy with charactermovementcomponent in remote-client?

I'm using the function called AddMovementInput.

I'm planning to use RPC which is unreliable, but I'm asking because there seems to be a better way.

[finite goblet]

I've found the Unreliable meta on RPC to be very random , it may go through or not even though the network conditions are the same even in negligible network traffic scenarios

I expected it to only start dropping after there's a meaningful network traffic

[rapid bronze]

Just make everything Reliable ( joking )

[chrome quest]

Lmao.