multiplayer

[lethal depot]

found it

[plush wave]

So how does passing an actor pointer to a replicated server function work?

Does the whole actor get serialized then sent over the network?

[bitter oriole]

The actor has to be replicated, and the RPC matches your pointer with the server's

[plush wave]

Ok so if the actor is not replicated (it's only on the client) then you can't send it in an RPC

[bitter oriole]

Indeed

[plush wave]

Makes sense

Thank you 🙂

[plush wave]

I'm confused... can you not send an FTransform over an RPC?

[twin juniper]

Hello guys, I am searching a good book, or anything that can make me learn multiplayer in UE4. Especially lag compensation, net sync, rpc etc...

[bitter oriole]

@plush wave Sure

[plush wave]

Thanks for confirming, must be doing something wrong on my end

[fleet viper]

is it possible that actors are owned by the gamestate? I have an actor that should be able to multicast

[winged badger]

all Actors can multicast

for some (GameMode, PlayerController) it doesn't make sense, and they do have to be replicated

Multicast = call a function across all data channels, while Server/Client RPCs require ownership to know over which single data channel they should be called

[fleet viper]

well but its not possible to call replicated events on actors that have no owners

@winged badger

[meager spade]

but all actors can multicast

regardless of who they are owned by

Zlo is 100 percent correct tho

Server/Client RPC's need an owning connection (normally something which has a chain back to a player controller).

[feral tendon]

Hey all!

How would you replicate interface based actors?
I have been searching for some time and UPROPERTY() is not allowed for actors defined as interfaces.
I have tried with TScriptInterface, but I am not sure if it is the right way.
Any advice?

[meager spade]

you cant

interface pointers are not replicable

[rich ridge]

does ue4 replicates UPROPERTY(Replicated) UMyObject * Object;

[meager spade]

if your UObject is set to replicate, you overrode the correct replication function in UObect

then sure

[rich ridge]

so do i need to override ReplicateSubobjects

[feral tendon]

Any workaround for interfaces or how would you approach this.
I definitely want to keep the interface based class structure tho.

[meager spade]

in the actor that replicates the UObject yes

you also need to tell that UObject it can replicate

{
    return IsReplicated() || Super::IsSupportedForNetworking();
}``` inside your UObject

[rich ridge]

ohh yess, thanks

[meager spade]

{
    bool WroteSomething = Super::ReplicateSubobjects(Channel, Bunch, RepFlags);
        WroteSomething |= Channel->ReplicateSubobject(MyUObjectPtr, *Bunch, *RepFlags);
    return WroteSomething;
}```

something like that

[rich ridge]

yes i had same thoughts, just wanted to confirm thanks again

so when uobject replicates, when its initialized using NewObject<> or when its member fields are updated like MyObject->Status = 10?

[meager spade]

same as any normal actor

it will replicate initial

then replicate on changes

[rich ridge]

this makes sense

[sterile plaza]

Good morning. I have some more replication questions.

I can't seem to get an actor on my game state to replicate. Ints replicate just fine, but I'm not hitting the breakpoint in my actor's OnRep function.

Never had any issues replicating actors before and I have no idea what's different this time.

UPROPERTY(ReplicatedUsing = OnRep_Actor)
AActor* Actor;

// cpp
void AGameState::GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const
{
    Super::GetLifetimeReplicatedProps(OutLifetimeProps);

    DOREPLIFETIME(AGameState, Actor);
}

void AGameState::OnRep_Actor()
{
    int X = 0;
}```

what else is needed?

[winged badger]

the Actor itself has to replicate, OnRep fires only when then NetGUID is resolved client side

also

there is an engine bug where if you only have one replicated property on a class, and its OnRep, it won't replicate

[sterile plaza]

Well, I also have an int and another actor for debug purposes.

also had this in BeginPlay on the server, forgot to include it
Actor = NewObject<Actor>();

[winged badger]

actors aren't ideally spawned with NEwObject

but GetWorld->SpawnActor<T>

[sterile plaza]

would this affect replication?

[winged badger]

and that Actor won't replicate, as vanilla engine Actor doesn't

you'd have to do Actor->SetReplicates(true); at very minimum after spawning it

[sterile plaza]

I originally was doing this with a uobject, since my class doesn't actually need to be in the level. It's a manager. But I'm having trouble finding definition documentation about actor vs uobject replication and since I'm having trouble, trying to reduce variables.

vanilla actor doesn't replicate, just because it doesn't call SetReplicates(true)?

[winged badger]

and it doesn't have bReplicates true by default

spawning manager Acots is suboptimal, too

they are easier to link up with everything if they are loaded from the Package

[sterile plaza]

sure, just trying to figure out how to replicate any object on the game state since that seems to be failing for anything I try other than basic types

[winged badger]

any UObject has to replicate in order for a poitner to it to be resolived

and Actor is a UObject here

yours doesn't

and UObjects don't replicate by default

[sterile plaza]

Maybe we should focus on my actual use case then? What do I need to do to a uobject to make it replicate? Is there more than calling SetReplicates(true) in the constructor?

[winged badger]

yes

manager is best as an Actor you have one instance of on the level

not as UObject

you really want them loaded from package (pre-placed on the level)

[sterile plaza]

oh right, there is no SetReplicates for uobjects

[winged badger]

as that guarantees they are already around by the time first objects start to replicate

[sterile plaza]

so this is just data about item instances that all clients need

it really doesn't need to be in the level at all

[winged badger]

then use a data asset

[sterile plaza]

why a data asset?

this is runtime transient data

[winged badger]

it its static data that never changes

[sterile plaza]

this is stuff like weapon health that can change over time

[winged badger]

you can go with an Actor, or slap an ActorComponent on the GameState then

but on short, for your pointer replication

for pointer to an object to be resolved over network, object has to be NetAddressable

that means its either:

loaded from Package

spawned in runtime and Replicated

so if you were to assign a reference to an actor from the level to your Actor variable, it would replicate

[sterile plaza]

Oh. Are actors only replicated if they're in a world.

[winged badger]

or if you spawned the Actor that has bReplicates = true, or called SetReplicates(true) after its spawned

and do not spawn actors with NewObject

[sterile plaza]

I've probably never tried to NewObject an actor and had that replicate before.

I've only ever spawned them into the world like you suggested.

This is making more sense now.

I think I've probably added actors to the world, added replicating components to an actor that's already replicated, or replicated structs.

Thanks for walking me through it.

[feral tendon]

Hello!
I am having trouble replicating interface based actor.
As I have found that interfaces can't be replicated, I don't know what to do in this case.
There's a thread on reddit (https://www.reddit.com/r/unrealengine/comments/ey8mk6/can_unreal_replicate_c_uinterface/) that suggests to replicate the pointer to the actor instead, but I am not sure how to accomplish that.

[sterile plaza]

I'm not entirely sure what they mean, but perhaps they meant you could have:

UPROPERTY(Replicated)
Actor* InterfaceActor;

You would then have to cast obviously.

I can't say I've ever tried to replicate interfaced actors, so I don't have experience in this area, unfortunately.

[feral tendon]

Yep. This might be, but unfortunately then I would lose the possibility to call methods via interface without casting, without having to know which actor the interface based actor is tied to. I guess one way to do this is to create some sort of base actor class from interface and replicate that actor.

[lost inlet]

Wait I'm completely confused here. If you replicate an actor that implements an interface you just cast to the interface

Replication is completely irrelevant here

[sterile plaza]

It seems like he wants the interface type to replicate as well, so he doesn't have to cast to the interface.

[wise zephyr]

hey guys can someone help me as to why my client cannot call execute on server function in blueprint? please help i looked everywhere
i am working with replication for multiplayer

[sterile plaza]

What is the function on?

an actor?

Clients can call server function on actors they own. This generally means your own player controller.

If they call server functions on an actor they don't own, it's ignored.

[wise zephyr]

hey ray its on an actor that the player interacts with

i made a cube that changes size when it gets hit with a ray cast... a simple demo

the node that replicates on server doesnt get called when the raycast from player hits the cube

on client side

[sterile plaza]

You can see if you have authority by calling SwitchHasAuthority in blueprint. If you have authority, then you can call server RPCs.

[wise zephyr]

im going to take a screenshot of the blueprint

switch has authority pretty much does gives authority to the server

how do i update the server from a client interaction?

so clients call call run on server replication functions?

cant*

i have to set the owner for the client to get run on server to work

i dont know how to do that

[lost inlet]

for the client to call an RPC on an actor, the player needs ownership or the actor or you need to use an RPC on something the player actually owns (like their controller or pawn) to handle the interaction instead

[wise zephyr]

@lost inlet thanks man i have no idea how to set the owner can you please help me

i see there is a blueprint node set owner

but i dont know how to use it

[lost inlet]

i don't really do much network code in BP

[wise zephyr]

i tried googling it

oh ok np thanks

[wise zephyr]

THIS IS DRIVING ME FUCKING NUTS

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

i followed this fucking tutorial and still same results

[wise zephyr]

ok so i got it to work if this is inside the player character class

works as expected

but doesnt work when its inside the other object

[sharp orchid]

What is everyone's thoughts on capping server FPS? Do you guys feel it's best to cap it at 30,48, or 60fps or just let it run uncapped going as high as it can?

[meager spade]

@wise zephyr of course it wont

Server/Client RPC's need a owning connection

that Actor needs to be owned by a player

you can use the SetOwner node to set the owner btw

[wise zephyr]

i set the owner of the player same as the object still didnt work

[meager spade]

then you can RPC in it

has to be set on the server

not the client.

[wise zephyr]

ok cool how can i do that

if is server i guess ill do then set it that way

[meager spade]

also dont ever use Get Player Character in multiplayer

we never use it, and have no reason to use it

[wise zephyr]

please help me man i have been trying since like 7am

non stop

[meager spade]

bad things happen

http://cedric-neukirchen.net/2017/02/14/multiplayer-network-compendium/

have you read this?

[wise zephyr]

i saw it but i skipped it to tired to readddd i just want a simple example ugh

i googled everrrything so annoying

its as simple as this

this is all i want

i just want that one function to fire

to change the color of the cube

im going to have to read this tomorrow i guess

i been up since 5am

just trying to find a tutorial on this

all i want is for this to run

[meager spade]

you cant set owner the same frame you want to RPC

that is not how it works

[wise zephyr]

but would that be the right owner?

I GOT IT WORK

OMFG

LMFAO

WHAT THE FUCK

NOPE

FALSE ALARM

custom event wasnt set to replicate on server

FUCK

still not working

FUCK FUCK FUCK!! I thought i got it to work!

please help me please help me please help me

im dying over here

OK

making progress

ok so for some reason only overlap events call the server replication

LOVE HOW THERE IS NO DOCUMENTATION ON SET OWNER

LOVE IT

[hazy siren]

did you read the networking compendium yet?

[meager spade]

no he got bored

so i got bored 😄

[wise zephyr]

lmao

im reading it

but its not really helping me

[proud pier]

Still struggling to get my Mac build or PIE to connect to my iOS build. I get the "Invalid Net ID" error. I know it's due to the package mismatch, and I've set the cvar to ignorepackagemismatch in my device profile settings, but it doesn't seem to have helped. Is there anything else I need to do to enable cross platform network connections?

Actually, it won't let me add that cvar to the Mac profiles in Device Profiles

It does nothing when I select it...

working with 4.25.1 from source

[rich ridge]

@proud pier I did searched the engine source code for the error message "Invalid Net ID", i can't find it

UE_LOG(LogRep, Error, TEXT("StartReplicating: Invalid Net GUID. Object may fail to replicate properties or handle RPCs. Object %s"), *Object->GetPathName()); I could only found this

[proud pier]

weird, I may have made that error up but I remember seeing it and being like, wow that's not very informative... anyway, here's what I'm getting now:

LogNet: Error: UEngine::BroadcastNetworkFailure: FailureType = PendingConnectionFailure, ErrorString = incompatible_unique_net_id, Driver = PendingNetDriver IpNetDriver_9 LogNet: Warning: Network Failure: PendingNetDriver[PendingConnectionFailure]: incompatible_unique_net_id LogNet: NetworkFailure: PendingConnectionFailure, Error: 'incompatible_unique_net_id

[rich ridge]

ok so its failing at handshake

which online subsystem you are using

[proud pier]

Null

[fleet viper]

Server/Client RPC's need an owning connection (normally something which has a chain back to a player controller).
@meager spade

[rich ridge]

@proud pier

[fleet viper]

Which structure would you suggest for a global actor that acts as a manager?

[rich ridge]

@fleet viper It should be actor

only actors are allowed to do RPC

[fleet viper]

I mean ownage and so on

[meager spade]

not true, Objects and Actor components can

they just need there owner path to go to a owning connection (player controller)

[fleet viper]

So a game state would be also possible?

[meager spade]

no

only for multicast rpcs

not for server/client rpcs

[fleet viper]

Ok

[meager spade]

gamestate is not owned by anyone

so how can a server/client rpc work?

[fleet viper]

I just don't like the idea of caching every type of that actor into the server controller

[rich ridge]

@meager spade

only actors can do RPC

[meager spade]

UObjects can do RPC's just fine

if its owner is an actor

with a owning connection

[rich ridge]

so i guess its not documented

[meager spade]

correct, i have RPC's in my FireMode UObject

and they fire just fine

cause a ActorComponent is not an Actor

[fleet viper]

@meager spade so what you'd do for a manager would be to just cache all actors into the server player controller right?

[meager spade]

and you can have RPC's inside them 😄

cache what actors?

i don't know what you are doing or what you are trying to achieve

[fleet viper]

An actor that manages things replicated to everyone

[meager spade]

but what kinda things

[fleet viper]

Such as spawning new actors and holding values

[meager spade]

why do you need to do server/client rpcs with that?

[fleet viper]

When someone buys an ai from the actor the actor should spawn the ai

And also despawn if he sells the ai

[rich ridge]

@meager spade If UObjects can do RPC, then I can have URPCManager inside PlayerController, and I will set PlayerController as owner of RPCManager.

[meager spade]

seems strange

why not just make it an Actor Component?

tho i just keep my RPC's in the controller 😄

[rich ridge]

why not just make it an Actor Component?
@meager spade Yes correct

[meager spade]

@fleet viper you don't need server or client rpcs for that

your players controller, tells the Manager

🤷

inside the manager that is*

[rich ridge]

tho i just keep my RPC's in the controller 😄
@meager spade if you keep all RPCs in PC then don;t you think your PC is too much corwded

[meager spade]

nah

i have BasePlayerController for core stuff

and game player controller for in game stuff

[rich ridge]

i have BasePlayerController for core stuff
@meager spade got it SOLID principle.

[meager spade]

#cpp that is not a MP question @desert lance

[fleet viper]

@meager spade that is the problem I didn't use the controller in any way its just one call from the hud to the manager that tells it to spawn it

[meager spade]

then use it

the PC can send a server rpc to the manager to do stuff

like buy X, etc

[fleet viper]

Yeah right

So instead of Hud>Manager I use Hud>PC>Manager

[meager spade]

so HUD will get owning PLayerController, then do ServerBuyItem(Item, Quantity) etc

then that function will do Manager->BuyItem(blah, blah)

[fleet viper]

K good

Thanks for the help

[meager spade]

that is the purpose of the player controller, tbh is to do functionality that requires server request

its the central point of your player

[proud pier]

@rich ridge so I'm not setting playerID ? is that the issue? I was told that incompatible_unique_net_id meant that the packages were mismatched

[rich ridge]

not sure, i just pointed you to the code where its throwing error, its upto you to investigate

are you trying to connect to dedicated server

[proud pier]

no it's just a self-hosted server

[rich ridge]

dedicated means UE4 server

[proud pier]

no

client as a server

The host opens a level with ?listen

and the clients are connecting directly via IP

not using sessions to connect, I know that will not work with the OSS Null over the internet

[rich ridge]

on iOS it is using iOSSubsystem, the listen server is using NULL subsystem

[proud pier]

I see, but even if I explicitly set the OSS to null in the config files?

does iOS just force you to run the iOSSubsystem?

[rich ridge]

i don't know UE4 might have platform check as well

i never worked with iOS

[proud pier]

I think they added it recently to skip over meaningless bug reports in QA for fortnite

and I can't find documentation anywhere about how to overcome it

[rich ridge]

I can suggest one thing to debug. Why dont you log NetId type at both places and see if they are same

[proud pier]

Will give that try, thanks!

[rich ridge]

check for this type, i guess they are not same

[proud pier]

good call

also here's the post I was referring to in case anyone else is in the same boat:

https://forums.unrealengine.com/community/general-discussion/1551415-from-4-19-to-4-21-incompatible_unique_net_id

Sorry for the troubles everyone, I wrote that to avoid our QA causing late night, last minute fires when we are trying to ship games. As you probably know, any commandline addition of the form
That being said, I'm curious, how do you get around the automatic calls to RegisterPlayer that would probably complain. Do you overload these functions? Do you not use the session interface to manage multiplayer sessions? Just want to understand the paths you are treading.

Most client/server relationships should be talking compatible OnlineSubsystems. For example, it makes little sense for a Steam client to join a non Steam server and not authenticate. A lot of that pipeline was written in the base engine implementation. APlayerState has one FUniqueNetId, which should be the one defined by DefaultPlatformSubsystem in your DefaultEngine.ini file.

so it's almost exclusively when you negate the sessions interface to connect

[rich ridge]

I have tried using direct IP connect and it used to work on NULL subsystem and without any extra effort (Android -> Remote-server), in your case i think its OSS mismatch.

[proud pier]

yep, sounds right

I'm gonna dig into the Collaborative Viewer example project file

It works as expected there...

That's why I'm so confused on this one, at any rate, thanks for the help

[wise zephyr]

WELP IM FUCKED LOL

Gonna have to buy some udemy courses

https://www.udemy.com/courses/search/?q=unreal+multiplayer

[floral crow]

@floral crow That should work, as far as I can see. The AClientSimulationClock actor is also replicated right?
@chrome bay @winged badger Here's the code for the ClientSimulationClock.h

ClientSimulationClock.cpp

RTSPlayerController.cpp

RTSPlayerController.h

Please tell me I'm missing something silly, a specifier or something, because I'm loosing my mind 😢

[crude coral]

is strange!!android client can't create session or join session if use UMG buttons and he can create/join session if i use android event input like volume up/down or android Back...etc..
i thought that because Android don't have onlinesubsystem on unreal 4 and if use OSS null that will work for google play services and ignore Anroid...and the solution i thought is to create OSS for android itself
because if i uncheck (enable google play support) in the project settings then the OSS null will work for Android because google play services not supported...but if i check (enable google play support) OSS null will work for google play services and ignore Android this time...that mean i need create OSS cpp class for android itself?

[floral crow]

I managed to solve it

Please tell me I'm missing something silly, a specifier or something, because I'm loosing my mind 😢
@floral crow Two dumb mistakes on my end: 1) I never added the Tick function to increase ClientSimulationTime by DeltaSeconds; 2) I was getting the warnings because I was creating a clock instance per client replicated to all, so the copy from player 2 was failing to have a rightful owner on Player 1's world. I marked the object as COND_OwnerOnly and the warning disappeared.

It was silly after all 🤦

[oak hill]

It's possible to wrap a FFastArraySerializer struct in a TArray? Or to have other structs inside it? Or I need to have separated FFastArraySerializer structs? I need a sort of dynamic number of inventories

[winged badger]

wrap it in an actor component, instantiate as many as you need i think would be best

[oak hill]

@winged badger you mean to have an actor component for each FFastArraySerializer struct?

[winged badger]

its an option i would prefer to putting them into an array personally

[oak hill]

I think I'll give a try, at least I should be able to achieve the dynamic inventory that I need

By the way when I wrap the struct in a TArray I think it breaks. It doesn't trigger the replicated functions on the client anymore

Or I'm doing something wrong

[winged badger]

unless you do a fastarray inside a fastarray i wouldn't expect it to

thats what makes the actorcomponent approach simpler

[oak hill]

Thanks @winged badger , you're absolutely right. I'm only concerned about the overhead by having more actor components

[winged badger]

they replicate via the actor's channel

so the overhead is minimal

[smoky ore]

Hey guys, I am coding a multiplayer shooter in my freetime, would anyone know off the top of their head why a hitch like this may occur? I do the traces locally and then do a ServerRPC to validate all the things we did hit. Only happens for shotguns after the amount of bullets that can be fired is above 10.

[feral tendon]

HI! I have an actor and I want it to replicate collision, but I am not able to get this to work.

• the actor is set to replicate

SetReplicates(true);

• I have added the collision variable (I even added on_rep function to see if the collision variable value changes on clients and this method gets fired)

    UPROPERTY(Replicated, ReplicatedUsing = OnRep_Test)
    TEnumAsByte<ECollisionEnabled::Type> collisionTestVar;

• also added DOREPLIFETIME macro line for that variable for replication

void APickupableStone::GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const
{
    Super::GetLifetimeReplicatedProps(OutLifetimeProps);

    DOREPLIFETIME(APickupableStone, collisionTestVar);
        ...

• I update this collision value

if (Role == ROLE_Authority)
{
    collisionTestVar = ECollisionEnabled::NoCollision;

    CollisionSphereComponent->SetCollisionEnabled(collisionTestVar);
    StaticMeshComponent->SetCollisionEnabled(collisionTestVar);
}

Anyways it seems that collision is still not replicated on clients, not sure why.
Any idea what else to try?

[smoky ore]

what is your OnRep_Test?

[feral tendon]

God.. I am so dumb.. Uhm. After moving the following logic out of the ROLE_Authority block, it works!

    CollisionSphereComponent->SetCollisionEnabled(collisionTestVar);
    StaticMeshComponent->SetCollisionEnabled(collisionTestVar);

It makes sense to replicate the value and as the value is replicated, update the collision on each client based on the replicated value.

I guess I had to write it all down to make my brain work differently.. 😆

@smoky ore - Great remark. After updating the collision variable, update the components collision

void TestActor::OnRep_Test()
{
    CollisionSphereComponent->SetCollisionEnabled(collisionTestVar);
    StaticMeshComponent->SetCollisionEnabled(collisionTestVar);
    GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Blue, TEXT("Collision changed on client aswell!"));
}

[oak hill]

they replicate via the actor's channel
@winged badger thanks

[meager spade]

@smoky ore test without the debug lines

and debug stuff, those can cause hitches

[smoky ore]

@meager spade didnt effect it. its just this function is causing issues for whatever reason. I can comment out everything in this function and it still hitches for whatever reason

{
    const auto GM = GetWorld() ? GetWorld()->GetAuthGameMode<AInfinityGameModeBase>() : nullptr;
    const bool bIgnoreServerSideValidation = GM ? (GM && !GM->ShouldValidateClientSideHits()) : false;

    for (auto& Hit : Hits)
    {
        if (bIgnoreServerSideValidation || ValidateFirearmHit(Hit))
        {
            ConfirmedFirearmHit(Hit);
        }
    }

    MulticastSpawnFXForHits(Hits);
}```

[errant vapor]

are asset/persistent object references replicated using the entire asset path? eg should i be adding a one-character-long folder name and keep the asset names as short as possible to minimize bandwidth cost?

[lost juniper]

How can I remove all momentum from a character when teleporting them to a new location?

[meager spade]

call StopMovementImmediately

on the CMC @lost juniper

{
    Velocity = FVector::ZeroVector;
    UpdateComponentVelocity();
}```

it basically zeros the velocity

[smoky ore]

Follow up on my question: The issue was that I was sending in too much information in the struct. I trimmed it down and now there aren't any hitches (or at least noticable ones)

[feral tendon]

Hello. How to handle jittering when working with projectile movement component?
As I have read from this thread (https://forums.unrealengine.com/development-discussion/c-gameplay-programming/81178-projectile-replication-on-the-client-the-movement-is-choppy), it is suggested to simulate projectile movement on client side aswell.

What I currently do:

• I have an actor (throwable) with projectile movement component attached to character (movement component is set inactive until thrown)
• I have set the velocity variable replicated via rep_notify function
• if server throws the object

if (HasAuthority())
...
        Velocity = (OwnerForwardVector + FVector(0.f, 0.f, 1.f)) * 1000.f;
        MovementComponent->Velocity = Velocity;
        MovementComponent->Activate(true);
...

• if client throws object, it is notified via change of replicated velocity variable

void CustomThrowable::OnRep_MovementComponentVelocity()
{
    MovementComponent->Velocity = Velocity;
    MovementComponent->Activate(true);
}

Not sure if I am doing it right, but after throwing the object, the movement is still jittering.
Any idea?

[wicked brook]

@feral tendon I used smooth sync plugin for projectile movement actors and it works damn well. Maybe try that if you have the plugin

[versed socket]

Hey just wanted to call this out here (posted about it in #looking-for-talent ) -- if you know how to make VOIP work (particularly for Vivox), I'm willing to pay $100USD to have you sit and walk me through the process of getting it working.

[feral tendon]

@wicked brook Sounds good. I'll look into this.

Although it costs about 20 euros, it seems pretty good tool, but I am sure the problem could be solved without this tool. Thanks for the suggesion tho!

[smoky ore]

@feral tendon it doesnt appear you are setting MovementComponentVelocity on the server

[rose prawn]

Is there any simple way to tell if player hosts the game? (BP)

Something like "is Client / is Host"

[winged badger]

in BP you have IsServer

in c++ its GetNetMode() != ENetMode::Client

@feral tendon that velocity assignment is super weird

[rose prawn]

Thank you Zlo!

[wicked brook]

@feral tendon No problem. It was free a while back so didnt know if you had it or not. Good Luck!

[feral tendon]

@smoky ore "it doesnt appear you are setting MovementComponentVelocity on the server"

• I am setting it on server in this part of code

if (HasAuthority())
...
        Velocity = (OwnerForwardVector + FVector(0.f, 0.f, 1.f)) * 1000.f;
        MovementComponent->Velocity = Velocity;
        ...

@winged badger "that velocity assignment is super weird"

• Thanks for the note. I am going to look into this. Any suggestions about that?

[winged badger]

i assume its a side scroller

as nothing else makes sense with that velocity assignment

but then again, if you are moving to the left side of your screen, that would cause projectile to effectively stay at the same point during its entire lifetime

[smoky ore]

right, but is velocity is tied to OnRep?

[winged badger]

its not, as you set it with authority only

[feral tendon]

It's a side scroller yep. If you refer to how the velocity is calculated, then yes, I agree - it's a bit sloppy, I agree.

But how would you replicate the location of the projectile without causing it to jitter as I understand it doesn't update the location for clients fast enough.
I added a multicast transform setter method in each Tick method call and only then I was able to have the projectile move without jittering (I know that mutlicasting here is terrible solution, but I just tested if that would work).

[winged badger]

client needs to know only 2 things to fully replicate the projectile path

its Origin and its Velocity

and those can't change

[feral tendon]

So I should not replicate movement itself, but those two values

[winged badger]

yep

[feral tendon]

Let me try that. Thanks for the tip 🙂

[winged badger]

jitter usually happens when server starts course correcting client side simulation

[feral tendon]

Yup. I had the same idea and also read it from this forum thread - https://forums.unrealengine.com/development-discussion/c-gameplay-programming/81178-projectile-replication-on-the-client-the-movement-is-choppy

[tribal solstice]

I have a simple multiplayer setup where the server starts a listen server (open level, listen) and the other player connects via IP (console 'open IP'). I successfully connect with the client, and can confirm this server side. For some reason, I can't trigger events of any kind on the client from the server. I'm trying to do a simple print string and it doesn't work. In editor running two instances it works as expected, but once packaged it does not. Any ideas why this might be?

[smoky ore]

have you tried adjusting the net update rate? i am not sure if that would solve your issue

[tribal solstice]

I haven't tried that, not sure how to do that, I'll take a look

[smoky ore]

(this was at Kurik)

[tribal solstice]

ah! my bad

[waxen socket]

Good evening. Who generally owns a pawn? They're generally spawned on the server so then does the server own them? Or is it that they're owned by the client whose player controller has possessed them?

[mystic pilot]

As soon as they get a controller, the controller owns them.
See APawn::PossessBy():

{
    SetOwner(NewController);
    ```

[delicate zinc]

Can I put Start and End Game in the Game State? or should I put it in game mode?

[misty stump]

What's the best way to send the last input vector for the character to the server? I have a PhysFunction that relies on knowing the players current input vector but the server keeps net correcting because the authoritative version has zero values for the input vector. Someone suggested SetMoveFor but I'm not quite sure if that's right.

[thin stratus]

If you use a Character with CMC, then only really by utilizing that movement component.

Or you allow client side authority on it

[plush wave]

Can volumes be replicated?

[fossil spoke]

Any Actor can be replicated.

If your Volume is in a Replicated Actor

Sure.

[bitter oriole]

Though of course, replicating its data or behavior is a different question entirely

[plush wave]

So the size of the volume is not necessary replicated by default?

[oak hill]

Hey guys, I'm looking into Online Beacons and I'd like to know if they can be used to create a sort of P2P connection between clients

Or are they intended to work by connecting the clients through the server?

[fossil spoke]

@oak hill They can allow Replication between individual Clients.

Typically used for Parties/Lobbies as well as getting more detailed information from Servers before initiating an actual connection.

[oak hill]

Thanks @fossil spoke . So what I was wondering is if it's possible to have the clients connected as normal to the server and let one of the client become the beacon host to communicate directly with other clients, for example to manage a party

I'm not really sure how to manage parties XD

[bitter oriole]

@plush wave Most non-gameplay objects in UE4 don't replicate anything, but you can check in the source

[fleet viper]

why am i not able to retrieve the return value of a spawned ai when called by a multicast?

cause the ai also spawns on both sides so why am i only able to retrieve it by the server?

[bitter oriole]

RPCs can't return values, if that's your question

The calling code would have to block the entire game during as long as the ping time to get the result

[fleet viper]

@bitter oriole sorry that i didnt clarify im calling a multicasted event and the return value of the spawnAI node is returning null on client side

[bitter oriole]

Is the spawned object replicated ?

[grizzled stirrup]

Has anyone ran into the issue when refreshing steam leaderboards, sometimes (25% chance) the data returned is garbage? (random numbers for ranks and secondary score data, numbers that should be 5 can be 59,448,184 and the name field is blank)

Is the data possibly coming back out of order and that huge number is actually representing a string or something?

[unkempt tiger]

is it normal for the server to have a pawn's player controller be NULL?

[bitter oriole]

It's normal for any pawn to have a nullptr PC if it's not possessed

[unkempt tiger]

Oh, that makes sense

[fleet viper]

@bitter oriole yes

[bitter oriole]

Replicated objects need to be created on server

[fleet viper]

so what would a correct setup look like?

[bitter oriole]

Don't call that code on clients at all

Server only

[fleet viper]

but if i spawn the object on the server the clients wouldnt be able to see it or am i wrong?

[bitter oriole]

If it's replicated, they will be replicated to clients once it is spawned on the server

[fleet viper]

but this doesnt solve it. to add the pawn to the collection i need to have that reference also on the server

[bitter oriole]

Only the server can create replicated objects

That's a hard rule

So don't even try creating them on client

[fleet viper]

yes but the client needs a reference to the spawned ai

[bitter oriole]

Then the client needs a replicated variable that holds a pointer to that spawned AI, set on the server after spawning

[fleet viper]

ok

still does not work

heres the setup

[meager spade]

you need a replication 101 😄

[fleet viper]

Parcour!

Jokes aside im actually not THAT bad at replication but im so confused with all of this haha

[meager spade]

well

replication only works one way

Server -> Client

[fleet viper]

yep

[meager spade]

AI should be server only

where are you running the above code?

[fleet viper]

i dont think you guys are understanding my setup i am spawning the ai on the server and with that reference i want to add this pointer to a array in my controller, so that whenever this ship gets selected the pc can check if he owns this ai

[bitter oriole]

I did understand that

But all of that should be entirely server-side

The array can then be replicated

And you're done

[meager spade]

where are you running the code tho?

on the PC?

[fleet viper]

to add the ai to the array? in the pc

[bitter oriole]

Your game mode or PC should spawn the AI, server only, and then add it to a replicated array of AIs, server only again

The client can then simply check the replicated array

AI needs to be replicated for that to works, of course

Nothing needs to involve the client directly here

[fleet viper]

will transfer the logic into the pc one sec

[meager spade]

where was that logic?

cause you cant do server/client RPC's in an actor not owned by an owning connection btw

[fleet viper]

yeah about that..i now heard three different answers to that haha

[meager spade]

three different answers?

there is only one

you cant send server/client rpcs via an actor that is not owned by an owning connection

there is no if's or buts.

[fleet viper]

this is the current setup now the only thing that doesnt work is that the pointer doesnt get set on the client side too. i did replicate the array but still

the add ship to player function

[thin stratus]

Which pointer?

The Array?

Keep in mind, that the array replicating and the actor inside replicating are two different things

You can actually have the array replicate with a new entry and that entry is "null" until the actor instace also replicates (or the call to spawn it)

[waxen socket]

Good morning. I'd like some advice on whether to put certain properties in the game state or game mode.

The score visible in the HUD updates every time an enemy is destroyed so this should be recorded and accessed through the game state.

The gold is collected through the course of a match but only displayed on the game over screen as a total sum so this should be handled by the game mode.

The mission criteria are set at the beginning of a match and then achieved and expressed through sound effects and visual notifications throughout the course of a match so these should be set in the game mode, and kept track of during play by the game state.

The final results of high score, gold balance, and mission results should be retrieved by and saved to file by the game mode.

Does that sound correct? Any advice would be appreciated.

Cheers.

[meager spade]

GameState should hold the games state, Total Scores for teams, Total money for teams, etc

GameMode is the rules of the game, ie once Total Score == 100, then game is finished

[waxen socket]

Whether or not I need to share that information with all clients?

[meager spade]

just don't replicate it if you don't need other clients to see it

the property that is

server can still use GameState for internal tracking purposes

the criteria on the other hand

should be in GameMode

like GameState has how many gold was collected during the game, GameMode has the criteria for when the game should end (Collected enough gold, died, etc).

[waxen socket]

And where do I run the functions that check to see if the criteria has been met?

Say BP_Enemy runs EnemyDestroyed() which calls ScorePoint() on the game state. Is it there on the game state that I would check if the new total matches the needed score on the game mode?

[meager spade]

you could tell the GameMode to run its check via the ScorePoint function on the GameState

as the GameMode is server only, its fine

[waxen socket]

That's advisable to have that kind of communication? The game state calling functions on the game mode?

[meager spade]

i normally have a timer

on gamemode

checking the stuff

but either way works

that timer tick will check game criteria

most games do it, including fornite, even paragon did

[waxen socket]

Okay. Thanks for that advice. I think what was confusing me was that most documentation says that the game state is used for information that is meant to be shared with all clients. So to have properties in there that don't replicate seems counter to that idea.

[meager spade]

i mean, you can store them in GameMode, its your choice

its just i like to keep game state in the state

which is everything to do with the games State.

i know all Game related state stuff is there

[waxen socket]

That sounds wise.

Finally, at the end of the game when I have all the player controllers display their game over screens, I'll have them access the mission results, final score, and final gold through the game state. That sounds right?

[meager spade]

yes, normally you would ClientRPC the players telling them its over

[winged badger]

i RPC that stuff over

[meager spade]

and they display the results, game over screen, etc

[winged badger]

its actually a less indirect way of doing it, too

iterate over all controllers -> Client RPC -> from RPC call a function on HUD to display it

vs SetVar on GS -> OnRep access HUD (which is not direct access this time) -> show data

[waxen socket]

So then you're both saying the same thing, right? The game state would find out from the game mode that the game has finished, and then loop through all the controllers and tell them to display their game over screens while passing them the final results.

[winged badger]

no

[waxen socket]

😅

Sorry...

[winged badger]

GameMode can loop through the controllers directly

and should

[meager spade]

GameMode should control the flow of the game

When it starts, when it finishes, etc

[winged badger]

you need GameMode's GetNumPlayers

to loop through all controllers in BP

GetNumPlayers -> For (o to NumPlayers-1) -> GetPlayerController[Index] -> Cast to your PC -> Call RPC

its one of the few situations where i approve of using GetPlayerController[Index]

[waxen socket]

I see. Thank you. And do you agree with Kaos' suggestion that I could either use a timer to check if the criteria has been met or make a call from the game state to the game mode each time a point is scored in order to compare the current score/mission status against the total needed by the game mode?

[winged badger]

if i tracked it in GameState, i'd use an event dispatcher rather then a timer or direct call

but yeah, comes to pretty much the same thing

odds are you're going to need it for UI as well

[waxen socket]

Dispatchers are no more efficient in the then end than direct calls, eh? It's just a matter of style?

Cause if you bind an event then you need a reference to the class that has the dispatcher. The same way you'd need a reference to that class in order to make a call.

[winged badger]

you'll need UI to listen to it in order to display score in event driven mode

[meager spade]

UT4 example has ```/**

• DefaultTimer is called once per second and is useful for consistent timed events that don't require to be
• done every frame.
  **/
  void AUTGameMode::DefaultTimer()```

this checks like Game Time end

etc

[waxen socket]

Okay. I guess I just figured that only calling a function to update the score when a point is scored is better than running a timer but if that's how Epic does it then I guess that's how it should be done.

[meager spade]

well

if you also have a time limit

then you need some kinda timer

like if game lasts 10 minutes

so you might aswell check the score aswell in that timer

[waxen socket]

That seems reasonable, yeah.

Thank you both so much for your time today. I really appreciate it.

Cheers.

[fleet viper]

@thin stratus the pointer of the actor

[rose egret]

if I call a server RPC with a UObject* argument pointing to an asset that is loaded on client but not the server.
what should happen to the value when server get the rpc ? should it be null or automatically loaded ?

[dry dove]

Hello is that normal the link https://github.com/EpicGames/UnrealEngine
Is not working anymore to make dedicated server?

[lost inlet]

not sure what that has anything to do with a dedicated server, but to access the source on github you need to link your github account with your epic one

https://www.epicgames.com/help/en-US/epic-accounts-c74/connect-accounts-c110/how-do-i-link-my-unreal-engine-account-with-my-github-account-a3618

pretty sure you can package a dedicated server with the launcher version though

[dry dove]

Hello Guys, i have a question, when i build my game, in the same exe i have my server and the client ?

is there a way to split them for more security ?

[lost inlet]

security through obscurity is kinda meh, but the "client" target (as opposed to "game") will strip out the listen server functionality

also you could make a game module that is only compiled into the server build

[dry dove]

ame module that is only compiled into the server : that is interesting !

do you have any doc or somthing to help me ?

because i had 2 points of view, making a server in go or c++, or using all features/framework from UE4 dedicated

[lost inlet]

if you created a new game module, you would add it to your server's Target.cs file

but not the client/game one

so with that, anything in the server module will only be compiled into the server build

[dry dove]

ok understood for compiling modules only for server

[rich ridge]

pretty sure you can package a dedicated server with the launcher version though
@lost inlet To build dedicated server you need source build.

[lost inlet]

still?

[rich ridge]

yes

[lost inlet]

we've used a source build forever so not a problem i've run into so 🤷‍♂️

[rich ridge]

me too

[dry dove]

Also another question, @rich ridge i've seen this methode from doc but this link is not available https://github.com/EpicGames/UnrealEngine

the one as you need to check [] [dedicated server]

[lost inlet]

like i said, you need to link your epic and github accounts

after you've linked them, that github repo will be accessible

[dry dove]

i didn't see that part ok thx

[rich ridge]

Unreal engine is a private repository

@dry dove after you link, you will see like this not 404

[dry dove]

ok it should take few minutes i think afeter linked

by this time, i have another question

in what case you recommand to make dedicated server from "scratch" and in what case to use UE4 dedicated server. I know from 0 it's longer and pain but faster, in the other hand UE4 dedicated server will be faster dev with more features but slower?

[rich ridge]

it totally depends on kind of game you are making. Its not like if you are making a game with UE4 you must build dedicated server.

If your game doesn't need dedicated server you don't need to build one

[dry dove]

yes i know thx, but let's say dedicated server ue4 is for multyplayers 2-150 ppl? if i go more i should make one from scratch ?

[rich ridge]

i don't understand what you mean by from scratch for dedicated server?

[dry dove]

i mean code it form 0, fresh start server development in golang or c++

[rich ridge]

wait wait wait..... whatever code you write for your game in C++, the same code will be your dedicated server

[dry dove]

yes in the case i use UE4 dedicated, but i want to make "my own server dedicated"

[rich ridge]

ohk, then it's a painful path.

[dry dove]

yeah but the difference in both is i can handle more ppl with my own dedicated?

[rich ridge]

a while ago few people were trying to make their dedicated server in Node.js, so never heard back from them about the progress.

[dry dove]

😆

[rich ridge]

any reason why u wanna make dedicated server in go.

[dry dove]

i made one 3years ago with QT++ i made many clients running but i had more important stuff to do

well i need to use this ue4 server to understand the weakness and strongest parts

i think you can dev very fast amazing things, but maybe laggy when many ppl will connect

[rich ridge]

actually ue4 doesn't give you a server, the UE4's dedicated server is actually a game with no rendering.

[dry dove]

yes i have dedicated servers using kubernetes

[rich ridge]

yes i have dedicated servers using kubernetes
@dry dove this is horizontal scaling

it has nothing to do with ue4 dedicated server

[dry dove]

in my server archi, also i can split things, custom lobby, and when dedicated server is up, i send ppl from custom lobby to ue4 dedicated server

[rich ridge]

for this need Epic already has a product called Epic Online services

[dry dove]

Ah nice with matchmaking and stuff i think?

I think they published what they did for fortnite ?

[rich ridge]

https://dev.epicgames.com/en-US/services

and its free of cost

[dry dove]

yes I think they published what they did for fortnite

[rich ridge]

not exactly, but to some extend it is what fortnite uses.

[next girder]

HELLO

IM FREE

[dry dove]

Hello Zach

@rich ridge it should take couples hours to synchronize my acc epic with github

to see the private repository ?

[rich ridge]

it is instant, it should not take time

@next girder if you are free use Facebook

[dry dove]

Oh they sent invitation !

i was refreshing page only

[next girder]

WHAT

WAIT

i meant i could talk now

[rich ridge]

i meant i could talk now
@next girder my bad, sorry

[next girder]

its ok

i dont like face book that much

its weird

[silent frost]

Hey, im making a multiplayer game where you can be this kind of ghost shirt. Its made of 3 meshes with transparent image-sequence textures, playing on them. Everything works when i test in the editor, but when i package the server and windowsnoeditor, and run it. Only one of the videos play. I'm fairly new to UE4, so any point in the right direction is appreciated. Could it be about building? or replication?

here its working in the editor. Should i try deleting some folders, so when it builds, it builds from scratch?

[silent frost]

i guess this is the problem:

[2020.07.26-20.12.32:519][ 0]LogMediaAssets: Error: Failed to validate media source arm2imageseq (img://../../../AdvancedSocialSystem/Content/simpleCharacters/MarkTholander/gif/gif2)
[2020.07.26-20.12.32:519][ 0]LogMediaAssets: Error: Failed to validate media source arm3mediaseq (img://../../../AdvancedSocialSystem/Content/simpleCharacters/MarkTholander/gif/gif3)

Okay, so it seems the images arent packaged into the build.

[silent frost]

okay, so i made the mistake of importing the images instead of just putting the in the folder. Don't know why it worked in the editor though. But it works packaged as well now. cheers.

[hardy ferry]

Has anyone dealt with issues regarding replication of movement for the player?
Getting issues where the client is jittering like I'm not replicating the updated movement speed properly and it's rubber banding to catch up.
However, I'm no longer doing this.

Getting around this by trying to replicate character movement to the client, we'll see how this goes.

Compiling a build where I'm testing this fix. Just wondering if anyone else had encountered issues with client movement snapping and how you've solved it.

[silent frost]

i met a similar issue, but realized it was based on my running animation having a slight move farward and not only running in place.

[hardy ferry]

Was that based out of the default UE4 Animation basics, or custom?

[silent frost]

no never met the issue with the template characters, only characters i downloaded from mixamo

so it was custom

[hardy ferry]

Ah, fair enough

So for you the issue was purely related to the animation, nothing networking scripting wise?

this is my newest attempted fix.
Prior, I was just hooking the input directly into the movement code, but now I'm realizing it may need to be directly replicated?
But this approach feels wrong considering the CMC itself has networking built into the C++ code

[silent frost]

yes, fixing the animation fixed it. And i'm sorry, im quite new at ue4 so i can't really help you further. My blueprints was made for me by someone at fiverr. I can show you pictures if you want, but i don't understand them myself 🙂

[feral tendon]

I had jittering problem on client myself with projectile movement component and was able to solve it by replicating the origin and velocity variables of the projectile and not replicate movement itself, but I guess the problem is slightly different for you.

As Zlo mentioned - "jitter usually happens when server starts course correcting client side simulation"

[rough cobalt]

why cant my plays see each other? i made sure that "only owner see" is disabled on the characters mesh

[soft girder]

@rough cobalt make sure the mesh is relevant to non owners. make sure its not set to hidden and make sure visibility is checked. is the mesh part of the blueprint as a component? is it something your creating on construction or an event that is not being replicated?

attach it to something else. the camera is only relevant to owner and the mesh is unseeable. it may be passing that down to the attached children

the should both be attached to the root. alot of problems can occur if attachments are not on point

well i just checked. and i have a socket that the weapon gets attached to. the socket is attached to the camera so idk

i would like to see the entire right hand column with onl typed into the top

[rough cobalt]

what am i looking for when i type onl

[soft girder]

i wanna see it not typed sorry

[rough cobalt]

ah

that what you are looking for @soft girder ?

[soft girder]

ya

im guessing the arms in the view are the same mesh

the way you have it now should work from what i see

i dont understand why you can see the sphere tho

that is weird

is it still not working with the new set up?

[feral tendon]

I suggest you to compare your setup with the template FPS project. Not sure why you have that problem tho.

[soft girder]

is the actor and all that replicated? replicates movement on?

well he can see the sphere

maybe its the model or the uv maps

[feral tendon]

switch the model maybe

[soft girder]

could be the something in the materials even

models prob it tho

[feral tendon]

Add some random static mesh component with default cube and check if you can see it for both characters

[rough cobalt]

the sphere is an ammo pickup

ok i will try

[rough cobalt]

@feral tendon sorry for the ping, but yeah tried that and you still cant see the other player in the default fps project

[rose egret]

damn. BP inherited UPrimaryDataAsset is not supported for networking 😦

[fleet raven]

what do you mean? sending references to those works just fine

[rose egret]

@fleet raven FNetGUIDCache::SupportsObject: ItemInfo_C /Game/BP/CoconutInfo.CoconutInfo NOT Supported.

ItemInfo is BP class inherited from UPrimaryDataAsset .
and /Game/BP/CoconutInfo.CoconutInfo is an instance of it. the instance is not net addressable like other assets

[chrome bay]

Sounds like you've created an instance of it with NewObject - which yes won't be network supported.

You just reference the asset directly instead.

[rose egret]

no I didn't use NewObject it was just reference .

[chrome bay]

How are you referencing it?

Should just be UPROPERTY(Replicated) USomeDataAsset*

[rose egret]

thats BP only project 😦

[chrome bay]

Ah wait a sec - you said BP class? I'm pretty sure data assets aren't meant to be blueprinted

They're not meant to have graphs or anything, just create a UDataAsset in the CB then tell it to use your data asset class.

[rose egret]

yea. they are not blueprintable someone said inherit from UPrimaryDataAsset instead

[chrome bay]

So the asset in the CB has a purple icon yah?

You didn't create a BP then reparent it or something?

[rose egret]

the bp class has blue icon but the instance created with misc->data asset is red

[chrome bay]

Yeah red sorry. So the thing you're trying to send via RPC is the "red" one?

[rose egret]

damn I guess its here :

bool UObject::IsNameStableForNetworking() const
{
    return HasAnyFlags(RF_WasLoaded | RF_DefaultSubObject) || IsNative() || IsDefaultSubobject();
}

yea

[chrome bay]

I'm 99.9% sure I've done this before

It should work fine, you can send DataTable references for ex, or really any asset reference at all should work.

[rose egret]

unbelievable. I moved the class and instances to another folder to take an screen shot and show you the colors now its working

what the bug

😆

💩

[chrome bay]

How odd...

[rose egret]

I was in trouble from yesterday just because of this.

[meager spade]

one was created by not using DataAsset function

[chrome bay]

ItemInfo does indeed looks suspicious

[meager spade]

https://www.thegames.dev/snaps/UE4Editor-Win64-DebugGame_DnpsSOE5IM.png

we have one in blue

this was cause we made it using the Add blueprint

[chrome bay]

Looks as though UPrimaryDataAsset is tagged as Blueprintable.. wierdly. I mean I guess it shouldn't matter, you can still replicate a BP subclass just fine too.

And I guess it's reasonable to want functions in them too.. I've certainly done that in CPP

[rose egret]

ohum I think I found the bug wait

found it .
If I change the BP class (adding removing variable ) all assets will not be net addressable anymore, until I change one of their properties and resave

😆

thats why moving them to another folder solved that.

[feral tendon]

Good morning!
Any idea how to effectively update animations in clients so there wouldn't be any delay?
I have delay (which doesn't occur all the time, but sometimes) on clients and as the animation delays, all logic in animation notify events gets delayed aswell.
I have 2 replicated booleans in my Character class, which are updated if some key is pressed:

    UPROPERTY(Replicated)
    bool IsLifting;

    UPROPERTY(Replicated)
    bool IsThrowing;

..and these booleans are set in the animation state machine:

void UTestAnimInstance::NativeUpdateAnimation(float DeltaSeconds)
{
    Super::NativeUpdateAnimation(DeltaSeconds);

...
        IsLifting = Character->IsLifting;
        IsThrowing = Character->IsThrowing;
...

[chrome bay]

Well you can't fix lag

Clients will always be delayed by it, nothing you can do about it

Locally-controlled characters tend to "predict" what they are going to do locally, instead of waiting for the server to tell them.

But that's something you have to build on a case-by-case basis

[feral tendon]

Some thread, which is kind of old, suggested to use ForceNetUpdate method - I tried it, but it did not help for my case.
https://forums.unrealengine.com/development-discussion/blueprint-visual-scripting/95543-what-s-the-best-way-to-implement-smooth-lagless-animation-replication?123134-What-s-the-Best-Way-to-Implement-Smooth-Lagless-Animation-Replication=

[chrome bay]

ForceNetUpdate just means it'll send an update for that actor ASAP

[feral tendon]

Yup.

[chrome bay]

But it won't fix any delays.

If the latency affects the local player, the way to workaround that would be to predict the actions.

[feral tendon]

client side prediction?

[chrome bay]

Yeah

But how you implement that is pretty much always specific to whatever it is you're doing

[feral tendon]

Okay. Thanks for the pointer. In my case, as the throw action is delayed on clients, the thrown object gets destroyed on server normally, but as the animation and all that delays the thrown object gets destroyed for the clients in the air. Not sure how to solve that YET, but I am trying to figure it out.

[chrome bay]

Yeah it's tricky to give any advice without seeing a bit more detail about the end goal

[feral tendon]

Currently the end goal is to throw an object at some specific actor in a curve.

• I have implemented it with projectile movement component, which is set inactive until thrown

• After thrown, the movement component is set active and velocity and origin point are replicated, so that the movement would be smooth for clients

• After hit with specific target, the thrown object gets destroyed

• SERVER: Object is thrown -> the object gets destroyed on contact with specific target

• CLIENT: Object gets thrown with delay (because of the client animation delay problem) -> object was destroyed on server earlier (thrown actor object is replicated) -> object gets destroyed before it gets to the target

Not sure if that's better for you to give advice - let me know, if you need more info.

[meager spade]

you would need to start the animation on client, then you have two choices, Smoke and Mirrors or Client spawned Dummy Projectile

Client spawned projectile would spawn it locally, and tell the server to spawn it, this would require some work, not easy to do in just BP

[feral tendon]

Sounds interesting - thanks for the tip. I am going to try that.
I prefer working with c++ anyways, unless I need to prototype.

[meager spade]

also don't destroy it instantly

hide it, and set its lifespan to like 1 second or so

this will give clients a chance to catch up

[feral tendon]

Sounds good.

[meager spade]

synching with animation is a PITA

what you need to remember is, other clients wont see each other

so doesn't matter if they are not perfectly in sync

[feral tendon]

Yep. It seems a bit painful indeed to keep it in sync, glad I asked about it here.
Thanks again

[lethal depot]

let's say I have a 2 player only multiplayer game and I want to handle the input on both server and client for both players
(server owns one player, client owns another)

if I understand well I have to call a server rpc if the input is fired from the client, and I have to call a multicast rpc if it is fired from the server

so I would need the input function which calls the proper RPC, the 2 RPC functions, and an actual implementation function... which is 4 function + _Validate(), so five

is there an easier way doing this? 🤔

[weak wind]

hello guys all good I'm having some problem with steam sdk, adjust to the version but when I go look for some files to finish do not think them

when I go on olinesubsystemsteamprivatepch.h only find olinesubsystemsteamprivate.h

[kindred widget]

@lethal depot You would set up the input the same for both the server and client. Just do a server RPC for the input. This will work if it's called from the server or a client since a server RPC from the server will run on itself and a server RPC from a client will make a call to the server.

[lethal depot]

but what I want is to call the function on the client's copy of the the server's player

as well

[kindred widget]

There are generally two ways to make something happen on all clients. If it's just a once off thing I'd probably go with Multicasting. If it's a state based thing like making sure that a player is crouched or toggling one player's headlamp on or off, then you'd want to RPC to the server, set a variable, and then use the REPNotify function to update that state on all clients.

[rich ridge]

Anybody who played with NetworkPrediction, any major developments on this Plugin?

[desert lance]

Ah, sorry! I always forget that this is the channel I am in when opening discord.

[livid holly]

I'm having some conceptual questions regarding the implementation of turn timers in turn-based online multiplayer games. I believe the best practice is to have the server calculate the timer, and the client only shows the visual / animations for when turn is ending / etc.

but if the connection is not perfect (e.g. lag, pkt loss, etc.), won't that mean it's possible that the client ends up having fewer / more time to play than in the sever?

as in, let's say the server warns the client at time 0 that it's his turn to play, but the client might only receive this message a bit later (let's say 1s), then at the time up, the server warns the client. that his turn is over. If the delay is smaller at the end (maybe 0.5s), wouldn't it mean the client ended up having more time to play than in the server?

or these difference wouldn't be significant?

[meager spade]

well the server can use the players last ping

/2 add this to the turn time, to make it fairer

[livid holly]

hmmm does the server always have access to the client's ping? or do we have to send manually from the client

[meager spade]

PlayerState holds a rough ping

[livid holly]

that helps

I mean in the end maybe it won't matter as much

if the turn is around 3-4 minutes these small differences due to lag probably won't be significant anyway

[meager spade]

nah

if your talking 1-2 seconds

then yes

[shy flicker]

Hi everyone! I'm using the top camera project of ue4 and I'm starting to play with networking. The movement mechanic it's only available in the server. I've made this movement faction server and reliable but the client movement is laggy on the client itself. Any idea how can i fix this?

https://gyazo.com/f8ba85ae6943dd744086d4b0fef01407

• rotation doesn't work

[lost inlet]

is the new push model networking actually documented somewhere or is it all in PushModel.h?

[chrome bay]

yeah that is the documentation

[lost inlet]

searching push model site:docs.unrealengine.com just comes up with a comment from ERepLayoutFlags

which is not what i'm after

[errant vapor]

so what should be teh default actor replication settings for stuff that's pushmodel based? ie will they work on an actor thats otherwise set to dormant?

[warped fjord]

can I set an actor to be owned by a client?

can't set rpcs from nonclient owned actors 😦

[fleet raven]

the documentation for push model can be summarized as "don't bother enabling, it doesn't really do anything yet"

it's missing the most crucial feature of all which is entirely skipping objects with no marked changes

I tried it on 5000 objects that were all fully push enabled and it did literally nothing at all to the performance

[errant vapor]

i see its already enabled by default on native AActor properties

[fleet raven]

they have code set up to mark the properties as dirty, but the entire system is disabled an compiled out

[errant vapor]

ahh, alright

[fleet raven]

you can turn it on, rebuild the engine, [fix some compile errors,] and then notice it doesn't do much

[errant vapor]

it would be nice, i think, with an alternative replication system where objects kinda opted in for replication in a frame

[livid holly]

@warped fjord as far as I understand, you need the actor to be owned by the local player controller (or any of it's owned actors)

like when you spawn the actor, get the first local PC (which is the client connection PC) and make that the new actor's owner

maybe there is a more appropriate way to make the connection owns the actor but usually I just do it through the local PC (or it's pawn)

[warped fjord]

@livid holly but only at spawn and not after its spawned?

[livid holly]

there is a SetOwner function

i usually only do it at spawn, but I guess you could call SetOwner (on the server?)

[warped fjord]

nope

Should work tho I'll test it later again

[kindred widget]

You can Set the owner at spawn or after so long as it's done on the server version of the replicated actor.

[warped fjord]

It has to be done on that actor I don't own?

[livid holly]

on the actor you wish to own

[kindred widget]

Not sure I understand the question?

[livid holly]

that wants to send server rpcs

[warped fjord]

So I can't do it out of my player controller for example

[livid holly]

you can

[kindred widget]

You can, as long as you do it on the server version of the player controller so that it's changing the owner on the server version of the replicated actor.

[warped fjord]

Okay thx

Phew I thought I was smart doing stuff in an seperate actor only to realize I can't send rpcs from it

Without owning it of course xD

Even when it says it does that on every replicated event *derp

[livid holly]

ive done this mistake so many times

organizing my code i would do logic on a separate actor and forget about the ownership thing

one thing that's helpful is that even actor components owned by the local PC or the pawn counts, so you can do "replication logic" inside a component

[warped fjord]

hrm I do this on my player controller pawn but it still doesn't work on the other unit pawn

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

https://i.imgur.com/bVkX92S.png

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

everything is replicated

owner name is right, but why isn't it executing on the server? T_T

the active unit is set and then I set the owner

[warped fjord]

Oh wait it could be that if they are placed in editor that you can't change them? I am clueless

[warped fjord]

Or maybe it's because it's possessed by an AIControllee

[candid swift]

Anyone in here tried steam multiplayer?

[bitter oriole]

Define Steam multiplayer

[candid swift]

https://forums.unrealengine.com/community/community-content-tools-and-tutorials/41043-advanced-sessions-plugin

[lost juniper]

Asked this over in #-blueprint but I think it might be more Appropriate here. I'm a little confused about the camera functionality in Unreal. Is there a way to bind the camera to no particular controller (or all players)?

I'm having an issue where when player 1's pawn is deleted, the camera stops working (ie. deletes itself).

I have a suspicion that it has to do with that fact that it's bound to player controller 0

But I don't know of a workaround for this 😐

[warped fjord]

pawn controls more or less the cam, so if you dont have anything else you dont have a cam except if you assign one

[bitter oriole]

@candid swift That's sessions/matchmaking so multiplayer itself is unaffected

It works the same, except the initial connection doesn't use an IP address

[warped fjord]

yep AI controller takes away the ownership

[warped fjord]

damn, that makes things complicated

need AI controller to move it, but also need ownership to do stuff on it D:

so I got pawns on the map that the player can possess, but also give some commands..while they are controlled by an AIcontroller

should I just put an aicontroller on it if I need it and don't possess it with anything while not?

or does that create even more problems? 😄

[livid holly]

if the paws are AI owned then shouldn't their movement be dicated on the server anyway?

or you can refactor the code needed to move the ai to a component / actor owned by the local pc

[winged badger]

@warped fjord if you keep server auth movement, you can jut RPC the move commands via AIController you Own

you would have to set the thing to replicate for it though

or you could do it via the PlayerController

if you want the client predicted movement to work with AIController, then you're in for some extensive CMC override, which you have to do in c++

and not just CMC, its tightly coupled with the Character and PlayerController as well

you also have to make sure the Pawn you're controlling via AIController has the Role AutonomouseProxy

[shy flicker]

Hi everyone, I'm trying to replicate a simple move to location. The issue that I'm getting is that the client doesn't rotate at all. I could force the rotation on tick but I feel that it's absolutely unnecessary. Any idea how can i fix this?

[novel tartan]

On a scale from 1 to 10, how fucked are you if you cant test multiplayer functionality with a dedicated server from home?

Currently looking for a solution because I can't open ports to host from home (what I used to do). I also cannot continue with my current project if I do not have a dedicated server that works on the internet to test with. I've heard that there's a way with a VPN to get around this but that has a price tag (all be it a little lower, not a lot of documentation about how to do it etc). I am also looking into cloud servers (some documentation) but they are quoted to be around 40-100$ a month and I am inexperienced with this option. I'd like to just be able to host it from home but it seems as though there's a type of double nat situation that makes it impossible to send information onto the net.

[abstract pike]

Does anyone know of a way to have different tick rates for the client and server versions of a replicated actor ?

[shrewd tinsel]

what to use instead of beginplay? its too early for me, is event possesed rpc to client a viable option?

[plush wave]

MyActor::MyActor() : Super()
{
  PrimaryActorTick.bCanEverTick = (GetLocalRole() == ROLE_Authority);
}

Will this make the actor only tick on the server?

Or should this code not be in the constructor?

Maybe in Begin play?

[chrome bay]

Definitely won't work in constructor

BeginPlay() should be fine, but you're better off using NetMode than Role.

Role can change

Also probably better to just override RegisterActorTickFunctions(); and check the NetMode there.

Then do bRegister &= !IsNetMode(NM_Client); and call Super.

[plush wave]

Ok so just to clarify override RegisterActorTickFunctions()

void MyActor::RegisterActorTickFunctions(bool bRegister) override
{
  bRegister &= !IsNetMode(NM_Client);
  Super::RegisterActorTickFunctions(bRegister);
}

That's pretty painless, thanks @chrome bay

I need to research Role more, didn't realize it can change at runtime...

[chrome bay]

Yep, Role isn't an indicator that it's on the Server either

Even if Role == Role_Authority

[plush wave]

Right right

Role determines who owns it

[polar wing]

hmmm my workflow might be flawed, but I'm getting a bit annoyed with the basic uproject launcher being outdated when compared with the visual studio debug version (basically, the build from VS version vs launching the editor via the uproject). I need to debug my multiplayer project in standalone for the online subsystem stuff and whatnot, and that's easier when running the .uproject from cmd and then attaching VS to the host/client.

However, having to delete build files and then rebuild the uproject and regenerate VS files every time I make a small change is obviously not a great workflow 🤣 . Is there an easy way I'm completely oblivious to to get the uproject updated?

[bitter oriole]

What do you mean by " basic uproject launcher being outdated " ?

The editor launches the DevelopmentGameEditor build so compile that in VS and you'll be fine

No deletion of anything required

You also can just run standalone builds from VS for OSS stuff, just add -game to command line in your default Development build

[polar wing]

ahhh thanks! I knew I was being super dumb. First time I'm testing a new OSS, so I was googling around and the various "fixes" were making me jump through hoops.

[polar wing]

oh my goodness, I also found my issue. Seamless travel is the devil. I need to get a better understanding of its ways.

[errant vapor]

can i create custom replication behavior for an arbitrary uproperty type on a replicated actor/component?

[cinder steppe]

does someone know why my characters are falling throu the map but pawns dont? it works offline or if the server spawns the map

[cinder steppe]

ok maybe a question thats easyer.
why is my BeginOverlap replicated by the server?

[bitter oriole]

It's not

It just happens there too

[cinder steppe]

ok, then why are all clients responding to the overlap even if only one of them triggered it?

[bitter oriole]

Overlap is a physics thing, it will happen on all clients and on the server

[cinder steppe]

thats not healthy xD
ok, then help me out on this last point
why does a function of a overlap react different depending if its a pawn or a character triggering it?
if i load a level with a pawn all is good.
but if i load a level with a character then the level is missing all collision

its as simple as it can get.

[bitter oriole]

It is healthy, UE4 replicates as little data as possible to avoid requiring immense volumes of network data, so all clients run the entire game on their own, and they just synchronize with eachother (using replication and RPCs). It's pretty much how you make network games. All physics stuff - including overlaps - happens everywhere at once.

[cinder steppe]

if a pawn1 triggers this function then the map is loaded an collision is there
pawn2 does not get the map loaded ( thats the plan, all good)
if character1 triggers this function then map is loaded but collision missing
character 2 does not get the map loaded ( still the plan for him atleast)

[bitter oriole]

Loading streaming levels in a multiplayer context will likely require the server alone to load the streaming level

[cinder steppe]

it works with the pawn

i also tryed run on owning client, but it still gets replicated to all clients ... :/

[bitter oriole]

Overlaps are not replicated

[cinder steppe]

i added a event

or is that invalid?

i just dont get it. why does it work with the pawn?

[bitter oriole]

My suggestion for you is to do a graph on a paper to decide what should happen on which machine, and draw how the RPCs and replicated data will go on

And of course add lots of logs to get more understanding of what happens

[wispy depot]

Hello.

I'm doing unreal networking, there is an auto connect to server option when you start in editor with 2+ players. If I turn that off which class or module is handling this connectivity for finding and joining sessions in c++.

[bitter oriole]

Online subsystem

NULL for LAN, Steam for Steam, etc

[wispy depot]

ok thanks for that too

That was where I was at, I'm kind of terrible making sense of the API, I know my server is already listening, I don't know how to find it's port. I don't know how to find the session name I don't know how to join it.

Figuring this out will probably make things a lot easier for me with other stuff as well.

[bitter oriole]

Which online platform are you working on ?

[wispy depot]

this is meant for LAN loopback i guess. PIE editor testing

[bitter oriole]

PIE does not support sessions, since the editor has its own auto-join system

You'll need to launch two standalone instances of your game to work with sessions

[wispy depot]

Ok and I am able to create join and manage sessions by creating the session, knowing the sessionname, and then searching for it I'm presuming. So how do I access things from OnlineSubsystem. Is it not part of UnrealNetwork.h? or gamemode or gamestatebase?

[bitter oriole]

No it's a different engine module with plugins for each platform

https://docs.unrealengine.com/en-US/Programming/Online/index.html

[wispy depot]

Alright thanks, cool I'm getting out of here, I had to replug my ethernet, pzlate lol. later

[meager spade]

is it Reliable or Unreliable that ignore relevancy on NetMulticasts?

[grim pelican]

Does anyone know why a cable component attached to a pawn isn't visible to other players?

[sterile plaza]

Anyone here had luck trying to add replication to a subsystem?

Along with that, what's a good way to build a singleton system that replicates all its data to clients? Hanging something off the GameState makes sense, as the GameState is replicated to clients. But UObjects don't replicate. I could just do an FStruct, but I need functions for my system's API. I'm currently using an actor component on the game state, but that doesn't seem in line with what components should be used for.

[meager spade]

UObjects do replicate

you need to do it with C++ tho

but its lies that UObjects don't replicate

[crystal crag]

So in this new project I am working on I just encountered the same problem I had with the last one... calling PlayMontage from the character in C++ does nothing. I have a slot in the anim BP, and I am playing a normal montage that isn't fancy. The PlayMontage call is occurring in the server. Do AnimMontages not auto play on all clients by default?

I thought that they did auto play on all clients if issued by the server

I just created a multicast function that uses the same code and now the montage plays... so I guess montages don't auto play on clients... which is not what I thought at all

I need to pull up the documentation because I could've sworn I even saw that listed there

[dark edge]

@sterile plaza what's wrong wothbutblicing in Gamestate or Gamemode? By definition those are already Singleton's and everything has a reference to it.

[empty matrix]

Guys, good night! How are you? I have a problem with the issue of delay on the server, it is giving 64 - 86ms of ping. How can I solve this?

[dark edge]

What is the actual ping?

[empty matrix]

64 - 86

@dark edge

[lost inlet]

unfortunately, i don't think we'll be able to change the speed of light and the conditions of the networking hardware between you and the server

[empty matrix]

Are you referring to me?
@lost inlet

[crystal crag]

Yes

[empty matrix]

Yes
@crystal crag Are you referring to me?

[crystal crag]

yep

He was responding to you

[empty matrix]

unfortunately, i don't think we'll be able to change the speed of light and the conditions of the networking hardware between you and the server
@lost inlet I did not understand...

[lost inlet]

when you send a packet to a remote server, that packet has to be electronically or optically transmitted between various networking equipment

and depending on how far away the server is and the quality of your ISP's routing, that can all change what ping you get

if the ping is unusually high for these conditions, then there could be a chance that the server's CPU is a bottleneck and causing a bit of latency but you can determine that by profiling

[empty matrix]

The point is that everything is stuck and lag ... For example I run any event and get that wonderful lag that nobody likes

[meager spade]

that is not a UE4 issue

[lost inlet]

well you were talking about 64-86ms of latency, which is fairly typical in a lot of parts of the world

[meager spade]

that is connection issue

[empty matrix]

if the ping is unusually high for these conditions, then there could be a chance that the server's CPU is a bottleneck and causing a bit of latency but you can determine that by profiling
@lost inlet I am using Steam Online Subsystem

[lost inlet]

the OSS is nothing to do with that

[meager spade]

nothing you can magically do, get a closer host

🤷

[lost inlet]

if "everything is stuck and lag[ging]" then that's another issue different from latency. you might have to clearer about what the actual issue is and possibly demonstrate it

[hoary lark]

probably just doesn't have clientside prediction set up for something or something lol

[meager spade]

if everything is server authoritive then you will notice delays, which is why a lot of games do prediction, let client feel responsive, let server handle any issues.

[empty matrix]

if "everything is stuck and lag[ging]" then that's another issue different from latency. you might have to clearer about what the actual issue is and possibly demonstrate it
@lost inlet I will record a video here

[crystal crag]

Sometimes I don't understand this channel. Not trying to bash GamerDev but I don't understand how that question gets answered, yet my simple question of do animation montages not automatically play on all clients if issued by a server gets ignored.

[empty matrix]

@lost inlet Here is the link to the video: https://drive.google.com/file/d/1gk3hjpOjZUYvPbTUxyijMyOcQj2WJis-/view?usp=sharing

[lost inlet]

well that wasn't an answer really, and in this video it looks like key movement data isn't being replicated

also @crystal crag you shouldn't really assume that anything is replicated, it would be much better to use a multicast to play the montage on other clients

[crystal crag]

Yeah apparently I had misunderstanding. Not sure where I read they automatically played on clients.

[meager spade]

also its actually better to do it via a replicated property

we do it to ensure clients play the montage correctly

                
                // Those are static parameters, they are only set when the montage is played. They are not changed after that.
                OwnerChar->ReplicatedMontage.AnimMontage = MontageToPlay;
                OwnerChar->ReplicatedMontage.Payload = Payload;
                OwnerChar->ReplicatedMontage.TagsToRemoveOnMontageEnded = MontageTags.TagsToRemove;
                OwnerChar->ReplicatedMontage.bForcePlayBit = !static_cast<bool>(OwnerChar->ReplicatedMontage.bForcePlayBit);
                OwnerChar->ReplicatedMontage.bLocallyInitiated = bFromServerRPC;
                //Force a net update, we need this to go through.
                OwnerChar->ForceNetUpdate();```

like this for example

then the OnRep handles it for clients

and we do stuff like catch up etc

@crystal crag

[crystal crag]

@meager spade thanks Kaos ^^ I'

ll keep that in mind

[empty matrix]

well that wasn't an answer really, and in this video it looks like key movement data isn't being replicated
@lost inlet everything is replicated ...

[hoary lark]

99% of the time this kind of issue is either Net Saturation (try limiting your framerate to 30 and see if the issue goes away, or use stat net to watch for Saturation value greater than 0)... or you aren't properly replicating something somehow.

[winged badger]

depends, i saw fails when UAnimInstance* was sent as an RPC payload

and those don't replicate, unless you do crazy amount of custom work to make them

they aren't even net addressable

[sterile plaza]

@sterile plaza what's wrong wothbutblicing in Gamestate or Gamemode? By definition those are already Singleton's and everything has a reference to it.
@dark edge I'm fine putting it on the game state. But what do I use? If it's just a struct, then I can't have functions for my API. The only thing that would replicate on the game state is a component right? Do I have other options?

[red sand]

Where should the leaderboard stuff be handled?
In GameMode or in GameState

[chrome bay]

Subsystem probably, unless you can guarantee you won't change map during leaderboard writes.

GameInstance (or a GI Subsystem preferably) is generally a safer way to interact with async online tasks.

Also note - only the server has GameMode access, clients only have GameState

@sterile plaza extending behaviour with components on the game state makes sense - I've done that for a bunch of stuff. You can replicate UObjects if you want to, but you have to use the actor to do it.

[red sand]

@chrome bay If it's confirmed that during the match the map won't be changed, where's the best place to store leaderboard stuff?

[chrome bay]

I still prefer a subsystem tbh

[dark edge]

@red sand if you're talking a leaderboard like the scoreboard in league of legends, put it in the game state

[chrome bay]

Keeps it away out of the mode-specific stuff

When you say leaderboard - are we talking online subsystem leaderboards or an in-game scoreboard?

[dark edge]

@chrome bay what's the approach to replicating stuff in a subsystem?

@chrome bay I think he's talking in game, like inside a match

[chrome bay]

Yeah you can't, that's why I'm wondering what we're talking about here

If it's a scoreboard, then all player states should keep track of their own score and stats - and clients should add and sort them in the leaderboard themselves.

[dark edge]

For something like pressing tab to see the KDA of everybody, each persons stats should exist in their player state, and the game state has an array of all player states by default

[red sand]

In-Game Scoreboard @chrome bay

[chrome bay]

Okay yeah, in which case each individual players' stats should go into their player state

And clients update their scoreboard UI from those

You can access all active player states from the Game State as Adriel says

[dark edge]

Ya, You would set it up like input on player controller shows a widget which is populated with data from the game state and it's array of player states.

[chrome bay]

yeah exactly

If you have teams or something, you might want to create something like "Team State" actors for your game (or just keep the team data in the game state, etc.)

Depends if your teams have a lot of data or not, might not be worth the overhead of another actor

[dark edge]

I suppose the only thing I'm not 100% sure of is where you would do the writing to game state. Would you do it in game state itself with a switch on authority or in the game mode?

[chrome bay]

Yeah I guess it depends, either is fine I think. If it's something like the scoring that's probably determined by the Game Mode anyway server-side, so in that case the Mode might update it.

[earnest trench]

https://docs.unrealengine.com/en-US/Gameplay/HowTo/Networking/TestMultiplayer/index.html

[chrome bay]

If you want a view you need to use Play As Listen Server

Dedicated Servers in previous versions of UE would never generate a viewport either

If you saw a viewport for the server, then it was a listen server

[earnest trench]

Interesting, I may have been misremembering then about back when I did PIE network learning. Thanks 👍

[winged badger]

you do have an option to go advanced play, uncheck single process, and choose which instance runs in PIE

others would run as standalone

[broken warren]

Hello, I have a multiplayer and I want to have a mine that explodes when it sees a player with a tag (blue or red).how can i do that ??
PS sorry for my bad english

[empty matrix]

99% of the time this kind of issue is either Net Saturation (try limiting your framerate to 30 and see if the issue goes away, or use stat net to watch for Saturation value greater than 0)... or you aren't properly replicating something somehow.
@hoary lark Okay, Stat Net? What is it?

[winged badger]

its a console command

@broken warren you do exactly the same thing you would in single player, then replicate the explosion (damage applied on server, multicast effects, hide and disable the actor destroying it after a few secodns rather then immediately)

reason for not destroying the actor immediately, is you don't want the destruction to replicate before the effects, and it might

[broken warren]

sorry but i don't understand if you don't mind send me the bp p

ps thank you

[winged badger]

i won't be making the BP

[broken warren]

ok

[winged badger]

to do the part thats not relevant to multiplayer (explode when someone from another team enters)

you need a team interface on both players and mines

then OnBeginOverlap if OtherActor implements TeamInterface and its team ID is not the same as mine's team, go boom

[broken warren]

Thanks i`ll try it later

[meager spade]

you would 100 percent need to make a team system (even if its just a simple enum with two teams)

use this to determine.

[rich ridge]

Let's say in my moba game, 9 are ai controlled and 1 is real player. Since ai will exist on server, does it make sense include the aicontroller in the generic RPC logic.

[broken warren]

whats if I use two character ...if u are in red u get this character but if u are in blue u get this character

[waxen socket]

Good morning. Just checking: Player controllers are owned by their respective client, right?

If I only want to create a widget on the client side inside of a player controller, I can switch on authority and only create the widget on the "remote" side and that will stop the event from firing where it shouldn't?

[empty matrix]

Guys, good night! How are you? I have a problem with the issue of delay on the server, it is giving 64 - 86ms of ping. How can I solve this?

This is a link to a vídeo of the error: https://drive.google.com/file/d/1gk3hjpOjZUYvPbTUxyijMyOcQj2WJis-/view?usp=sharing

[neat folio]

{
print("Hello Everyone!")
print("I am having an issue with my multiplayer system, I am using the Unreal Engeine 4 multiplayer system with the session nodes and every time i create a session it doesn't find work.")
print("I create a session, but when I search for it with a diffent game it doesn't find the index I created by making the game.")
print("If possible can someone tell me some things I can do to fix this.")
print("if needed ill send photos in 12 hours.")
}

[unkempt tiger]

I understand that a PlayerController does not replicate from server to client, but does it replicate from client to server?

As in, as far as inputs go

[chrome bay]

negative

Server -> Client, but client only receives the one they "own"

[unkempt tiger]

Oh, what sort of data is replicated?

Does the client just

Get a replicated instance of the player controller?

And that's it?

Well I do have another question, kind of unrelated

[chrome bay]

Yeah they get an instance of the controller, any properties on it marked as "Replicated" will then be rep'd too

[unkempt tiger]

I found out that Pawns actually implemented a server->client form of replication for both position and rotation, which I found very odd

I figured I should be the one to implement that sort of replication as a subclasser of Pawn

[chrome bay]

Well you can definitely send data to the server via an RPC (providing you own the actor)

Which I believe they do for things the client wants authority over, like control rotation etc.