multiplayer

[thin stratus]

It's not in the Experimental part of the Engine Plugins (5.0.2), but it also not really used, is it

Well that looks kinda bad

Hm, ue5-main has newer stuff

[twin juniper]

Looking forward to whatever that is tbh.

[thin stratus]

Well there are some changes

But what we currently have is 5 months old

And the last commit only removed some #if WITH_CHAOS lines

[lost inlet]

I'm glad NP isn't dead

well totally dead

[thin stratus]

Any info on it not being totally dead?

Cause it sure feels like it's totally dead

[lost inlet]

the fact there's commits in main

[thin stratus]

The ue5-main commit removed #if WITH_CHAOS lines .That might have been a global sweep

it's def not actively worked on it seems

I need to steal that insights view for the CMC if they aren't finishing this stuff

[lost inlet]

but worked on enough to be not considered experimental is weird

since it was moved out of there in 5.0

I suppose of there's a concerted effort to switch GAS to it, therefore Fortnite, then you'll see some progress

[dark edge]

What's the high level overview of Network Prediction and how it works? Is it some sort of generalized prediction framework?

[thin stratus]

Yeah but no idea how it works. had a quick look at it and closed it for now

[lost inlet]

that's what it's for, look at NetworkPredictionExtras for samples

one of the goals was to provide a unified prediction interface for CMC and GAS

[thin stratus]

Which is why I asked about it actually

Cause I suffer from that sh't atm

But I feel like this is months or years away

[lost inlet]

the NP extras plugin was last touched a week ago

that's what I saw when I was sure it was still alive

wasn't a PR either

[vernal holly]

hi, could i get some help with multiplayer line traces?

void ABlankCharacter::ShootBullet()
{
    FVector Start = FPSCameraComponent->GetComponentLocation();
    FVector End = FPSCameraComponent->GetComponentLocation() + (FPSCameraComponent->GetComponentRotation().Vector() * 10000.0f);
    FCollisionQueryParams QueryParams;
    QueryParams.AddIgnoredActor(this);
    
    FHitResult HitDetails = FHitResult(ForceInit);

    bool bIsHit = GetWorld()->LineTraceSingleByChannel(HitDetails,Start,End, ECC_GameTraceChannel3,QueryParams);

    if(bIsHit)
    {
        GEngine->AddOnScreenDebugMessage(-1, 5.0f, FColor::Blue, HitDetails.GetActor()->GetName());
        AActor* HitActor = HitDetails.GetActor();

        UGameplayStatics::ApplyPointDamage(HitActor, Damage, Start, HitDetails, GetInstigator()->Controller, this, DamageType);

        
        
    }
}

so this is my code right now

https://cdn.discordapp.com/attachments/907740542991999056/989987347296841728/unknown.png

but as you can see

when i shoot each character with the line trace

it all returns BP_TestBlankCharacter_C_1

and also, when shooting, instead of damaging the other character, it damages the shooter.

[solemn hedge]

is BP_TestBlankCharacter_C_1 the shooter character?

[raw wing]

I'm guessing it sees your character and says "I'm done!"

[vernal holly]

no

its always the hit character

[solemn hedge]

it's probably hitting itself, or one of it's own components?

I see you added AddIgnoredActor though

[vernal holly]

yeah

i can shoot at the floor and hit it just fine

[solemn hedge]

the this here is the BP_TestBlankCharacter_C_1 right?

[vernal holly]

and when i shoot at myself, by looking down at my feet, its BP_TestBlankCharacter_C_0

[solemn hedge]

if you shoot without the other player, you still hit yourself?

[vernal holly]

no, in both cases, this is BP_TestBlankCharacter_C_0

im pretty sure

but this whole multiplayer naming thing is pretty new to me

so idk what exactly is going on

[raw wing]

Print the current actor's name before the raycast just in case.

Want to make sure you're shooting the thing you think you are.

[vernal holly]

yep

[raw wing]

Try going to the side and shooting it from the side.

So like one of the arms pointed at you and shoot it on the side

[vernal holly]

its the same

[raw wing]

Okay cool I wanted to make sure that it wasn't shooting you and you had the names backwards lol

[vernal holly]

it seems like for both characters, bp_testblankcharacter_c_0 is itself, and bp_testblankcharacter_c_1 is the opponent

but to the server, bp_testblankcharacter_c_0 is one, and bp_testblankcharacter_c_1 is the other

or something like that

so when i deal damage, im always doing it to bp_testblankcharacter_c_0

but then that doesn't explain how bp_testblankcharacter_c_1 also deals damage to itself when it fires

oh yeah these are my net settings btw

[lost inlet]

"play as listen server" will mean that the first PIE window will not be a client as they are the host

and with that they're authority, so no networking is involved

[vernal holly]

hmmm

alr

so bug isn't network related

ill look into it further ty

[cinder steeple]

Long shot question: Hoping that someone may know the answer.
I have a large map and using level streaming of the landscape (+ 2 LODS). I would like to be able to run a hosted multiplayer game with this large map and level streaming, and would like to know if there is a straight forward way to allow the client to authoritatively load in streaming levels on the server. If not, is there a memory conservative way to enable just collision of the LOD0 landscape tile for clients. When a server player moves far enough away from client, the LOD0 landscape streams out and collision along with it, leading to the client falling through the landscape. I hope that makes enough sense and I really hope there is an answer.
UE 4.26

[narrow elbow]

Hey wondering if anyone can help, Im looking for a series guide or written guide or something to learn how to go about multiplayer, made a few small games and looking to dive into learning how making an MMO works

Ive been looking around and have seen many videos doing multiplayer in different ways and not sure which is best or anything.

Any pointers to places to elarn would be great

Specifically for MMO style games

Been thinking of following a tutorial for OWS

[lost inlet]

hopefully this isn't a bit of dunning kruger because small games to MMO architecture is a huge leap

[narrow elbow]

Oh I 100% know that but Id like to dip my toe in the water and start to learn, Im not saying oh Im gonna make a mmo in 3 months or something

I just want a starting place to learn how MMO style online games work and even just get a project set up to start messing with

[golden aurora]

Check samples and learn from them

[graceful flame]

Just did a sanity check with Lyra using simulated lag. 150ms min and 250ms max with around 3% packet loss and it performed as you might expect, lots of server correction errors and character jitter.

What sort of lag settings do you guys test your games with? Should I be aiming for something like 50ms min, and 150ms max? How much packet loss? Should this be simulating on client only, server only, or everyone?

[dark edge]

I suppose the first question is are you thinking of the stereotypical MMO style gameplay or MMO style scale?

[narrow elbow]

typical mmo style gameplay @dark edge

my goal basically is to set up a mmo project create wow style combat and be able to have 2 people load in and fight eachother / a mob

thats my current goal just to understand the basics of servers on a mmo style game

[dark edge]

Yeah that's very doable.

The correct way is probably something like gameplay abilities, but if you are a brand new to Unreal engine I can't really recommend starting there, that's a whole rat's nest of its own

But tab targeting and simple spells and stats without lag compensation is very easy to whip up

[narrow elbow]

i dont mind it being complicated and taking ages to figure out id like to start down the correct path as long as the struggle of learning/making it work would then allow me if i want to scale up properly and not learn a completely new thing

[dark edge]

The problem with starting with gas is you won't really understand the why until you have tried to do it yourself. And in fact, things can be done much simpler if you just roll your own system. I would do that first before messing with gas unless you are already very comfortable with gameplay programming

[narrow elbow]

ive set up health/mana/damage system on EU5 with spells/attacks using a tutorial (BP not c++) (with some customization myself) for a single player RPG style game

Looking to branch out now a bit

[dark edge]

Are you comfy enough to have done that from scratch?

[narrow elbow]

Id probably have to look some stuff up again and it might take me a bit but in general yeh I get the logic behind how it works

[dark edge]

Aight then yeah maybe look at GAS. It takes some c++

[narrow elbow]

Ive looked into it a VERY small amount, Is GAS only for making ability's etc work on a multiplayer game or does GAS take care of servers etc also?

[sinful tree]

GAS is just for handling effects, abilities and attributes for your characters basically.

UE has nothing really built in for handling servers for MMOs.

[narrow elbow]

so plan of action

Learn GAS
Learn how to handle MMO servers
Combine both?

[sinful tree]

Learn Multiplayer should probably be at the top of that list. If you don't know what a client or server RPC is, or how to use an OnRep variable, then you're going to get stuck pretty quick.

[dark edge]

Yes, this is all assuming you know your way around Unreals networking to begin with

I personally recommend taking the project that you already have, and making it work in multiplayer, with tab targeting, a little fireball, a little melee attack, death, respawning, etc.

That'll keep you busy for a little while

[narrow elbow]

ok so that brings me back to my first question xD

Whats a good starting point to learn from for getting a project online, Ive seen OWS tutorial for mmo on UE is there any other options (I assume yes) but what would be best route to go for.

(Thanks for the advice btw much appreciated xD)

[dark edge]

Just start by reading up on how replication works and get stuff working, one bit at a time. Don't watch videos and stuff unless it's on the specifics, just try to do it

[twin juniper]

General question, for good measure, should I be storing health values in PlayerState rather then a character class them selves?

[humble bane]

has anyone tried EOS for multiplayer?

completely new to multiplayer in unreal or any game

i was wondering if EOS made it easier compared to having to replicate

what does it do?

ohh

i still have to replicate?

3rd person basic action combat

how long does replicating take?

ms?

lol

that sounds short

okay

lets say i have about 20 things i need to replicate?

how long am i looking, days or months?

am not following

so its easy to replicate?

yes

yea UE4 mutliplayer

i mean

like to make it

yea i have been learning 3rd person for a while now

[graceful flame]

@humble bane Check the pinned messages in this channel for some resources on getting starting with multiplayer and networking in general. There's a lot to it, and once you get started you'll probably end up re-doing lots of your work but that's all just parting of the learning process.

[dark edge]

Why tho? Seems so ass backwards

[humble bane]

thanks men

[dark edge]

But the player is not the pawn.

Yeah that always felt weird for me.

I like to make things super general tho, then I'd have to give all AI playerstates as well etc. Gets fucky

In my project there is no difference. Player character and AI character dont differ at all

But I suppose it's a design choice.

Makes testing dummy easy tho. Just possess an AI character and you're in business

It's a roguelike so gotta keep things consistent

So what exactly does using a playerstate get you if there's really nothing that a player does without a pawn context? I'm trying to see the benefit.

So did you put inventory on the ASC or just have open inventory be an ability?

In my case there is very much a split between the pond and the player, the player can have an inventory but it's like the stash in Diablo. If a player character dies, they drop all their stuff just like if an AI character dies

Yeah we have items granting abilities. I really wish items could have ASCS but that's a whole rat's nest

In our case it works out well because ammo is infinite, it's more like mana or energy. Item swap and reload take the same time so it's no problem.

[blissful saffron]

how do you typically handle the player's specific pawn when there are multiple pawns to choose from? My thinking was have the gamemode keep a map of <uniqueID, pawn> and then use that for GetDefaultPawnClassForController. Is there a typical best practice way of doing this that's different?

[dark edge]

Can't chosen pawn just live in PlayerState or in the PlayerController?

MyPawnClass

[blissful saffron]

Yeah, I guess it's no different really grabbing it from there when the GM spawns players as it is to pass it over to the GM

[dark edge]

Yeah I'd do PlayerState if it's public and PlayerController maybe if it isn't. But I'd lean towards PlayerState, as part of the State of a Player is their character class no?

[blissful saffron]

yeah, makes sense

[humble bane]

Can you start a game as a listen server, and then transition to a dedicated server?

[blissful saffron]

no

I mean, you could have the server player not play but that won't make it a dedicated server

[humble bane]

yea i mean after i make a dedicated server

[blissful saffron]

Then it wouldn't be a listen server

I guess I don't understand the question

[humble bane]

i hear a lot that listening server is easier

so i wanna start with listening server on a prototype

[blissful saffron]

oh

yeah

[humble bane]

and maybe a bit later change to dedicated

[blissful saffron]

yes

[humble bane]

okay

is it fairy simple to make the switch? assuming my game is still pretty small

[twin juniper]

https://youtu.be/cdmzd3v3W-o

I've wrecked the code by trying to gamedev.tv myself into this. I'm not yet fit for a multiplayer based job I guess.

The project repo: https://github.com/neosphereinteractive-real/FlightReplication/tree/dev-vivraan-fix-rep
If you do take a look at it, please only focus on the two latest commits from my branch.

I'm replying to my older message for highlighting the stuff I've already said earlier about the project.

I have worked on this kind of system for a gamejam. I rolled my own (shamelessly translated a gamedev.tv Unity plugin) inventory.

[humble bane]

how complicated is peer to peer multiplayer @blissful saffron

am looking at a tutorial just to overview, it doesnt seem to hard

[twin juniper]

UE handles it using a client-server in all cases though.

[humble bane]

yea it does

[humble bane]

is that bad thing

[dark edge]

Horrible

[pale pewter]

If I add experience to the player, should it be run on client and then within the function I set the server experience variable? or should adding experience be done from the server from the get go?

[dark edge]

Server.

Unless you want people to just tell the server they got 1,000,000,000 XP

[pale pewter]

so as long as the server calls the events and functions it will automatically be set on the client too

[dark edge]

Yes, the server's version of things is the truth.

[pale pewter]

Thank you sir! gotta redo my whole project now x)

[dark edge]

Just keep in mind to prefer repnotify over run on client / multicast events, and keep things simple.

[pale pewter]

I know about using RepNotify over multicast but how come to use it over run on client too?

[dark edge]

Because it's more reliable. If it's meant to be a persistent state, use repnotify

if you don't care about if it happens or not, run on client / multicast events are fine

[pale pewter]

Yup! got it ^^,

[wide sable]

Does anyone know a good tutorial for understanding replication with C++?

[humble bane]

how

[twin juniper]

Not really, it's just a choice they made

[twin juniper]

There's always the pinned messages, especially Cedric's doc.

[wide sable]

Ah woops didnt realize. Thank you !

[humble bane]

nice thanks i see

[twin juniper]

Thanks for the doc @thin stratus!

Need some help with my own multiplayer nightmare.

[thin stratus]

No biggie

[twin juniper]

@thin stratus if you wish to help, here's where to start.

[pallid stone]

I have the following in my .h file

    void onOverlapBegin(UPrimitiveComponent* OverlappedComp, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult);

    UFUNCTION(Client, reliable)
        void clientOnOverlapBegin(UPrimitiveComponent* OverlappedComp, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult);

    UFUNCTION()
        void onOverlapEnd(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex);

    UFUNCTION(Client, reliable)
        void clientOnOverlapEnd(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex);```

And this is how it's laid out in the cpp file

#include "Net/UnrealNetwork.h"

void ABuildPointBase::BeginPlay()
{
    Super::BeginPlay();
    
    renderSprite->OnComponentBeginOverlap.AddDynamic(this, &ABuildPointBase::onOverlapBegin);
    renderSprite->OnComponentEndOverlap.AddDynamic(this, &ABuildPointBase::onOverlapEnd);
}

void ABuildPointBase::onOverlapBegin(UPrimitiveComponent* OverlappedComp, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult)
{
    clientOnOverlapBegin(OverlappedComp, OtherActor, OtherComp, OtherBodyIndex,  bFromSweep, SweepResult);
}

void ABuildPointBase::clientOnOverlapBegin_Implementation(UPrimitiveComponent* OverlappedComp, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult)
{
    ASovereignReignCharacter* overlapKing = Cast<ASovereignReignCharacter>(OtherActor);
    UE_LOG(LogTemp, Warning, TEXT("Implemented client function - begin overlap"));
    if (overlapKing != nullptr) {
        UE_LOG(LogTemp, Warning, TEXT("Overlapped A King"));
        spawnThoughtBubble(overlapKing->getKMCHasCastle());
    }
}

void ABuildPointBase::onOverlapEnd(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex) {

    clientOnOverlapEnd(OverlappedComponent, OtherActor, OtherComp, OtherBodyIndex);
}

void ABuildPointBase::clientOnOverlapEnd_Implementation(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex) {
    UE_LOG(LogTemp, Warning, TEXT("Implemented client function - end overlap"));
    ASovereignReignCharacter* overlapKing = Cast<ASovereignReignCharacter>(OtherActor);
    if (overlapKing != nullptr) {
destroyThoughtBubble();
}
}```

However ue4 is crashing with "cannot find function clientOnOverlapBegin and clientOnOverlapEnd.  What am I doing wrong?

[winged badger]

quite a few things wrong there

collisions run separately on each machine, and are generally not RPCed through like you're doing

the bodies of RPC functions in a .cpp file need to have _Implementation at the end of their name

unreal is not crashing, as to crash it would need to be running first

and this doesn't

[pallid stone]

Gives this error

[winged badger]

also unreal coding standard is PascalCase, not CamelCase

[pallid stone]

I do camel case at work, it's force of habit

[winged badger]

well, that is awkward

[pallid stone]

But that's not the point

[winged badger]

UHT should never had let that compile

linker either

[pallid stone]

Running version 4.27.2

[winged badger]

when you define

UFUNCTION(Client, Whatever)
void ClientDoSomething();
void ClientDoSomething_Implementation():

second one is automatically added, you can declare it yourself if you wish

[pallid stone]

No they're just defined as this

UFUNCTION(Client, reliable)
void clientOnOverlapBegin(UPrimitiveComponent* OverlappedComp, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult);

The character, in the game, pases over the actor, that triggers the overlap, that is then meant to call the client version so it just displays something to the person who overlapped it

[winged badger]

but the one you have to implement is ClientDoSomething_Implementation()

but as i mentioned this is wrong, overlap happens on client and on server

client can handle its own damn overlap

[pallid stone]

Yeah I have those, if I have clientOnOverlapBegin, it errors saying that function is already defined in the actor.cpp.gen.obj

The actor that is overlapping is replicating, so it's making the thoughtbubble appear on everyone connected

I only want it to appear on the person who overlapped

Is there a better way to do this than a client function?

[winged badger]

you do that with IsLocallyControlled check

[pallid stone]

On the OtherActor?

[winged badger]

your boubble Actor casts the OtherActor to Pawn and then checks if its LocallyControlled

and then it happens only on the one that is in overlap, no RPCs required

as for firing the RPCs up there its just cutting this out

void ABuildPointBase::onOverlapBegin(UPrimitiveComponent* OverlappedComp, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult)
{
    clientOnOverlapBegin(OverlappedComp, OtherActor, OtherComp, OtherBodyIndex,  bFromSweep, SweepResult);
}
void ABuildPointBase::onOverlapEnd(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex) {

    clientOnOverlapEnd(OverlappedComponent, OtherActor, OtherComp, OtherBodyIndex);
}```

[pallid stone]

Doing the non rpc method sounds easier, thank you

[winged badger]

you can run entire systems without sending any network data specifically for them

our minimap and fog of war systems don't need any RPCs or replicated variables to run, for example

they do use IsLocallyControlled on few places and thats it

[pallid stone]

Absolutely fantastic. Thank you babe

[pallid mesa]

lol 🤣

[pallid stone]

If you have an actor that doesn't have a controller, what's the best alternative to using isLocallyControlled?

[twilit radish]

I assume it has an owner in that case? If so by comparing the owner I would say.

[winged badger]

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

    AActor* TopOwner;

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

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

but it assumes ownership has been setup

this function is also static

[twilit radish]

Can't you just use AActor::HasLocalNetOwner()?

https://github.com/EpicGames/UnrealEngine/blob/46544fa5e0aa9e6740c19b44b0628b72e7bbd5ce/Engine/Source/Runtime/Engine/Private/Actor.cpp#L1986

[winged badger]

you can, that function didn't exist when i wrote this one

[twilit radish]

Ah I see.

[winged badger]

top owner will never be Pawn that IsLocallyControlled though

it will either have a PC owner or won't be locally controlled

so im guessing this came to be by a not scrutinized enough PR

[twilit radish]

Because the pawn is always owned by the PC right?

[winged badger]

yes

[twilit radish]

In the case of having a player of course*

😛

But I mean it can't do any harm. It just won't do anything then I guess.

[winged badger]

i prefer the static, as i don't need to worry about the scope too much

from ActorComponent: USolsticeObjectLibrary::IsLocallyControlled(GetOwner()))

[twilit radish]

Is Solstice an actual Unreal file or is that from a project?

[winged badger]

its a released game

[twilit radish]

Although I do wonder about one thing with the AActor::HasLocalNetOwner one. It doesn't specifically cast to APlayerController. Will AI controllers be valid for "IsLocalController" on a Dedicated Server or Listen Server?

[winged badger]

i don't want the AIControllers on server returning true there

which they otherwise would

[twilit radish]

That's what I'm worried about.

If AI have "SimulatedProxy" as a remote role then it does return true for Listen Servers / Dedicated Servers.

https://github.com/EpicGames/UnrealEngine/blob/46544fa5e0aa9e6740c19b44b0628b72e7bbd5ce/Engine/Source/Runtime/Engine/Private/Controller.cpp#L92

That's pretty annoying honestly.

So I guess TL;DR use Zlo's method and not the weird AActor one if you just want to check for players :D

[sharp pagoda]

Is it possible to get the client's mouse position in a dedicated server? Currently, I'm sending a variable from the client to the server thru an RPC. However, it is currently running on a timer and it runs around 5 times per seconds and I don't think this is very efficient.

[twilit radish]

Not entirely sure but I believe not. But even then the dedicated server / client need to do the exact same thing. The dedicated server can’t magically guess the position 😄

If it’s a network performance issue you could lower the rate at which it sends the RPC. But it would seem unlikely to me it’s an issue in the first place.

[sharp pagoda]

I see. I guess I'll just stick with my current implementation, lower the rate, and just use interpolation. Thanks Thom!

[valid sierra]

How do I setup an actor to only be seen in a player's client, not by others? (unit selection indicator in this case, but I'll need it for many other things going forward)

[fathom aspen]

Spawn it client side for that client

[twilit radish]

Ignore what I said lol

It's not relevant in this specific case 😛

[fathom aspen]

Net relevancy is not specifically for this

[twilit radish]

I misread the question yeah 😅

[queen flower]

Hello! Multiplayer stuff is confusing. Hoping for some help.
Here is the error:
Blueprint Runtime Error: "Accessed None trying to read property CallFunc_GetPlayerCharacter_ReturnValue". Blueprint: BP_DronePing Function: Execute Ubergraph BP Drone Ping Graph: EventGraph Node: Set Distance
First image is the event that spawns the ping from LAlt key press.
2nd image is the ping Actors begin play, which starts a timer to update the Distance between itself and whatever player character 0 is (local player?).
For reference, the tutorial I followed even has the bug when it was made 2 months ago and they don't even solve it lol
https://youtu.be/4yPDG1AP2-g

In tests, the Distance value on the widget isnt updating after the first time of begin play, probably because of the error.
My play "net mode" settings use Play as Listen Server and I do have 2 for the number of players, and 2 players are spawning.
The initial Distance value for the ping is successfully set to the same for both players. The value should be different between both players because their distance to the ping is different.

[golden aurora]

Hello there

Doesn't it is really recommended to have delays in multiplayer functions, right?

I have one on BeginPlay to set some variables that are initialized later

[queen flower]

omg i figured it out

i tried so many thing -_- and no idea why this works and the other ones do not

[azure hollow]

{
    ServerFire_Implementation();
    GetWorldTimerManager().SetTimer(TimerHandle_HandleFire, this, &AMyCharacter::FireShot, .05f, true);
}

void AMyCharacter::ServerFire_Implementation()
{    
    GetWorldTimerManager().SetTimer(TimerHandle_HandleFire, this, &AMyCharacter::FireShot, .05f, true);
}```

someone can help? I don't know why particle spawned in the function "FireShot" is not replicating over the server

[twilit radish]

Assuming "StartFire" is on the client then the problem is likely that you're directly calling the "Implementation" method.

You normally should have a method in the header that you call. For example one I recently made:

Then all you do is just Server_RequestServerTimeStampSync(); from a client (but obviously in the context of your game).

[azure hollow]

in my .h I have this
UFUNCTION(Server, Reliable)
void ServerFire();

[twilit radish]

Then call ServerFire(); instead of ServerFire_Implementation();

[azure hollow]

mmm can you explain me why? 🙂

[twilit radish]

So the _Implementation method is as it suggests for executing the code on whatever side it should execute. If you declared the RPC as Server then it should execute only on the server. But you don't directly call the implementation method on the Client, Unreal does this for you once the RPC has been received on the server.

So if you want from the Client to send the RPC you call ServerFire(); and Unreal will automatically call the _Implementation later on for the Server.

[azure hollow]

so the code above is correct BUT i need to just call the func ServerFire() right?

[twilit radish]

Yeah.

[azure hollow]

cool I will try it now

[twilit radish]

void ATimeSyncPlayerState::OnSomeMethod()
{
        Server_RequestServerTimeStampSync();
}

void ATimeSyncPlayerState::Server_RequestServerTimeStampSync_Implementation()
{
    // Code..
}
```This is what I for example did in the example I was talking about. The "OnSomeMethod" gets called on the Client and then the _Implementation gets called on the server once the RPC request arrived 🙂

[azure hollow]

seems like it's working 😄 thank you

[twilit radish]

👍

[azure hollow]

ok not working when shooting from the server mm

[twilit radish]

Does the implementation method not get called or does the gameplay functionality not work?

[azure hollow]

the gameplay is working fine, if I shoot from the Client side, the server is able to see the hit of the projectile

if I shoot from the server the client can't see where is he shooting at

[twilit radish]

Well yes because the server doesn't tell the client in anyway with this that it shot.

Client -> Server != Server -> Client.

You'll need to tell through some way to other clients that a shot was fired.

[azure hollow]

so should be Multicast rather than Server?

[twilit radish]

No. You need something else along with it to tell other clients that a shot happened on the server.

[azure hollow]

ah ok

[twilit radish]

But that could be a multicast yes. But you don't need to change the ServerFire() method for it.

[azure hollow]

I'll try for it

because yeah Client don't know what going on

[twilit radish]

You have the first step in this picture. But are likely missing the second one 🙂

With "C1" being Client 1. "S" = Server and "C2" = A different client.

[azure hollow]

ok now it happening the reverse

obviously

[twilit radish]

"The reverse"?

[azure hollow]

yes now the client can see what is doing the server but the server obviously don't see what the client is doing

[faint gust]

i have an interaction system but i dont know how i can move it to multiplayer as i have tried moving the function to the GM moving the code to a replicated event and i dont know what else i can do if you need my BP il share

[azure hollow]

so this that you are saying is correct but how to implement it?

[twilit radish]

Client says "I shot" to the Server. The Server likely agrees with it and lets all other clients know that a shot was fired by for example a different RPC (or multicast). Unless it's something else than an instant shot, then you will likely need to use the replication system instead of using an RPC because that's a state. But that's the general idea.

[twilit radish]

The GameMode is not replicated to clients. It only exists on the Server side.

[uncut schooner]

Hi

[faint gust]

yeah and i tried to do other things but it still dosnt work

[uncut schooner]

Has anyone tackled syncing, attributes, client side predicted with server authentication?

And or health ect

[chrome quest]

Synced?

[twilit radish]

What about it didn't work though? 🙂

[chrome quest]

Hmm... I'd do that with GAS.

[azure hollow]

yes but I should create more function to make clients and server be aware of whats going on?

[faint gust]

it just dosnt trigger interactions like when i press E to pickup an item it dosnt do anything

[twilit radish]

Yes. You need some other method (for example a new RPC/multicast) that lets everyone else know that Client 1 for example has shot.

Client 2 or Client 3 can't magically guess that Client 1 has shot their weapon.

[azure hollow]

yes that's clear 😄

I will try and update you, thank you again dude

[twilit radish]

Does the interaction not arrive on the server, does the input just not work? It's difficult to tell what the issue may be. Print out some messages and see where it stops working I would say 🙂

Or use the Blueprint debugger. Also an option.

[faint gust]

in singleplayer i can do it fine but in MP it just dosnt do anything

[faint gust]

whats that?

[twilit radish]

It allows you to step through your blueprints. You mark a certain blueprint node as "Hey please stop the entire game when you arrive here" and from there you can slowly go through the next blueprint nodes it calls to see if it actually works.

[twilit radish]

That it works in singleplayer is not a guarantee it works in multiplayer. Multiplayer is a whole different setup 🙂

[faint gust]

how do i accsess the debugger?

[twilit radish]

But like I said. Just print some messages or use the BP debugger and see what doesn't work, something has to not work somewhere.

https://docs.unrealengine.com/4.27/en-US/ProgrammingAndScripting/Blueprints/UserGuide/Debugging/

[faint gust]

it seems the breakpoints never get excuted like they would in SP

[twilit radish]

Then go back further into the nodes until you find where it stops working 🙂

[faint gust]

well the breakpoints is where it stops working

and i have no idea why it stops working there

[twilit radish]

Does it stop after the first or second branch?

[faint gust]

the first breakpoint branch is where it stops in SP in MP it dose nothing

[twilit radish]

Does the breakpoint never get called in MP?

[faint gust]

it dosnt get called in MP

the forst branch dose get called though

[twilit radish]

Then you need to find out where it does get called but fails to proceed to this point.

[azure hollow]

is working fine now, thank you so much. One last question...everytime you need to make all these functions? or is there a faster way to notice clients/server?

[twilit radish]

To my knowledge yes. You can't directly call RPCs from clients to other clients. Everything goes through the Server. So you need at bare minimum 2 RPCs to reach from Client 1 to Client 3 as an example.

[azure hollow]

ok great

[twilit radish]

Client 1 -> Server -> Client 3.

[faint gust]

ok so it seems that the line trace always fails to see anything

[twilit radish]

Camera Manager 0 is likely the issue.

On a server there are multiple of those.

Unless this is on the client?

[faint gust]

this is client code

[twilit radish]

Ah nvm then.

[faint gust]

well a func on the client running every tick

on the player charafter

i think thats client

[twilit radish]

Doesn't have to be. Your character likely gets replicated to all other clients.

So if you don't check if it's specifically a locally controlled character then it also runs everywhere else.

Which means you may be debugging the wrong character as well 😅

[cinder steeple]

I have a large map and using level streaming / world composition of the landscape (2 LODS). I would like to be able to run a hosted multiplayer game with this large map and level streaming for server and clients, and would like to know if there is a straight forward way to allow the client to authoritatively load in streaming levels on the server. If not, is there a memory conservative way to enable just collision of the LOD0 landscape tile for clients?
When a server player moves far enough away from client, the LOD0 landscape streams out and collision along with it, leading to the client falling through the landscape. Sorry for asking the same question twice - I understand it may be too complex for an answer in here.
UE 4.26

[twilit radish]

Usually this kind of stuff is done based on distance or triggers on the server I would image? Take Minecraft as an example. All it does is load the map based on player their locations without much input from clients. It just checks what it needs to keep loaded based on distance.

[cinder steeple]

interesting, the issue with level streaming in a hosted game however is that only the server players position matters

the clients see the correct landscapes stream in, but dont authoritatively load the LOD0 landscape tiles so the collision just isnt there

[faint gust]

how can i fis this?

[twilit radish]

Check if the character is Locally Controlled. https://docs.unrealengine.com/4.26/en-US/BlueprintAPI/Pawn/IsLocallyControlled/

[cinder steeple]

thanks @twilit radish for the reply

[twilit radish]

The issue you will get regardless of this is that server has to load the parts of that map too. If only the clients spawn that specific map there's no way you can do anything with it on the server as the server doesn't know about it.

So even if you enable collision client side the server needs it too if you want authority.

[cinder steeple]

right - thats the question - how to tell the server to load these tiles (and not unload them )

since level streaming is based on distance from the tiles

I feel like I should be able to attach something to each client that belongs to the server, I've tried placing static mesh copies of the LOD0 landscape into the map and lodding those too (but memory utilization goes through the roof with too many tiles

[faint gust]

i added it and now the trace dose nothing

[twilit radish]

Then I misunderstood the question sorry. But I have not tried this before with level streaming / world composition so can't really provide an answer 😦

[faint gust]

it dosnt trigger the input

[cinder steeple]

no worries I greatly appreciate even the thought and time you put into it already

[twilit radish]

I would imagine there has to be a method somewhere that can just load it though or keep it loaded. But I'm unsure how Unreal did it.

[cinder steeple]

I can load them all but we're talking 400 tiles at 1009x1009 so over 2 millions triangles per tile

[twilit radish]

Are you sure you're debugging the correct character?

[twilit radish]

Sounds like a really bad idea yes 😅

[faint gust]

how would i know?

[twilit radish]

In the top right there should be a menu that allows you to debug different blueprints. Assuming you're running in PIE.

Let me start Unreal for a screenshot.

[faint gust]

i selected the client and it still dose nothing

[twilit radish]

Are you running with just one client connected? (Listen Server?).

[faint gust]

im running as a client

[twilit radish]

Then who is the server?

[faint gust]

its in the background

[twilit radish]

Ah I see. Does the "Interact Trace" still get called though?

[faint gust]

i think i found the issue

[twilit radish]

Well that's the issue right there.

[faint gust]

and now it traces

[twilit radish]

"Has Authority" checks the local network role which for clients isn't authority in this case.

[faint gust]

the only issue i see is that a hacker could theirtcaly interact with anything at any distance with this code

also the other clients arnt being updates about the stuff being interacted with

[twilit radish]

If you're worried about cheating then the server should make sure that the interact is valid.

If it's 'static' objects you can pick up it can be something as simple as doing the same logic on the server to verify if the trace actually hits that actor with the specified distance.

If they are moving objects it becomes more difficult though.

[faint gust]

the objects move

as i plan on the things being picked up and dropped all arround

[twilit radish]

Then you'll need to see what you find worth the effort to implement. The problem with moving objects is that by the time a RPC for example arrives on the server the trace may not be valid any more because on the server that object moved out of position.

[faint gust]

well they dont move that much

only if a player actualy picks them up or they roll down a hill

it would be a low chance that that happens like that

[twilit radish]

It's up to you to decide. I don't know your game. If you say you would rather want to have some more authority and it doesn't move too much go for it I guess.

[faint gust]

i would atleast want to make a range check

the issue is i dont know how to implement that as im new to making game and new to MP

[twilit radish]

You could with some math see if the direction is roughly the same and then check the distance with a bit of breathing space. Lot of options 🙂

[faint gust]

yeah i could do a cone cast for the server check

[twilit radish]

I think it's what one of the shooter examples from Epic them selves did if I don't remember incorrectly.

Or well. Part of the checks.

Multiplayer is complicated 😅

[faint gust]

the issue i dont know how i would implement a check

like to have the check execute and deny or allow

[twilit radish]

You likely have a RPC that the client sends to the server. You would do it in there.

[faint gust]

but couldnt the hacker just delete the RPC and ignore the response

[twilit radish]

If a hacker doesn't send a RPC to the server it picked up something then the server will never acknowledge that the client picked up something.

So no.

[faint gust]

but what if the client just dose the thing anyways ingorning the response

[twilit radish]

Then the server should disallow any requests it makes with that item because it doesn't have it.

[faint gust]

wdym if the hacker ignores the response then just says ok ima just do it

or wouldi have the server run the interface request

[twilit radish]

The server determines what happens.

If the server says "you don't have this item" then other clients should never get to see that item on their side. The hacker may see it but the server doesn't care and shouldn't care.

[faint gust]

so it goes like this

client says: hey server im interacting
server says: ok leme check if its allowed
server says: ok im running your interaction for you

[twilit radish]

Yes. That’s what you want to make happen if you want less cheats or no cheats.

[faint gust]

and if they are cheating i log an anticheat viloation so the admins can ban them

[twilit radish]

Depends on your game.

If you run dedicated servers. Sure. If it’s Listen Servers then absolutely don’t do it.

[faint gust]

its gonna be dedicated

thank you sir you have expanded my brain

[twilit radish]

Then you could do that if you want yes.

👍

[faint gust]

an RPC is just a custom event right?

[twilit radish]

An RPC is a message from or to a client or server with custom data.

[faint gust]

or i mean how would i do an RPC

i have no idea

[twilit radish]

I do mine in C++ so not sure how it works in BPs.

But it’s something that should not be too difficult to find on the unreal forums or anywhere I hope.

[faint gust]

You may also see the term RPC (Remote Procedure Call). If so, just be aware that replicated events in Blueprints essentially compile down to RPCs inside the engine - and this is what they're usually called in C++.

so a replicated custom event is an RPC

[twilit radish]

Could be. I’m not sure what everything is called in BP land 😛

[faint gust]

thats from the wiki

[twilit radish]

I do have to make dinner though so I’ll need to go for now 🙂

[faint gust]

same

well breakfeast

[twilit radish]

Also important. But yeah, good luck! 🙂

[faint gust]

this is an RPC in BP land

[fathom aspen]

I would avoid them if I can. Sometimes it's just inevitable. For example a BP only project doesn't have an OnRep_PlayerState so you can do a delay. Well that's a not so good example because you can have the code put in BeginPlay of PlayerState, but you get the idea...

[uncut schooner]

Yeah but GAS doesn't allow for predicted duration modifiers

[chrome quest]

true

[uncut schooner]

Has anyone tackled syncing, attributes, client side predicted with server authentication, not using GAS, since it doesn't work with duration based modifiers, and I need it to since that is optimized instead of doing something like sending an rpc every frame

[golden aurora]

That's what I thought. I always try to avoid them too but this time I was trying to get a reference that was initialized later. Including a small delay was super efficient to solve the problem.

[rocky night]

Hi, i got a thing…. 🫠When i Testplay with a friend my Game ( he is host iam client) after like 15 mins the host looks on my side like he is falling through the floor every few seconds.

[humble bane]

Was wondering

Would something like a cooldown system only be client side?

Since the player only need to know it

[pallid mesa]

no

mainly because you could cheat if the server had no business in the cooldown

so yeah it is indeed something that could be replicated only to the owner

[humble bane]

I see

[pallid mesa]

in theory many things within the asc are only important for the owner

[humble bane]

But because cheating?

[pallid mesa]

except for the cues and some attributes

[humble bane]

Hmmmm

[pallid mesa]

only the server can prevent cheating

[humble bane]

Yes true

[azure hollow]

hey guys
why UPROPERTY(Replicated)
float Value;
is giving me error when compiling?

[fathom aspen]

Because you don't have that Value in GetLifetimeReplicatedProps

Or you don't have an include to UnrealNetwork library

[azure hollow]

how it works exactly? In bp you just need tu check the box so I thought it was that easy

[fathom aspen]

https://docs.unrealengine.com/5.0/en-US/property-replication-in-unreal-engine/

^ + #include <Net/UnrealNetwork.h> in your .cpp

[faint gust]

how would i do this but multiplayer compatablei know the issue is the index but i need to get the camera manager to trace the line so is there a way to get the camera manager without the index?

[viscid night]

How can I replicate AI montage animation? I know I can send a server RPC and then multicast but I can only send server RPC through a client owned actor, so what would be a good practice/approach to replicate AI montage animations?

[latent heart]

You can send an rpc TO a client on any replicated actor.

You just can't send them back except on client-owned ones.

So if you want to replicate an anim montage on an AI character, simply do just that.

Or don't replicate the montage, replicate the state which triggers the montage.

(and use an OnRep to trigger it)

[viscid night]

thanks for the response, so if a client needs to play AI montage how can he send a server RPC? through player controller, player state etc?

[graceful flame]

This advice alone is what the majority of people on here need to heed. Once you understand RPCs and multicasts it’s so easy to fall into the trap of making a huge chain of nodes all executing over the network when instead you can just use a single OnRep to control the state and then only execute the nodes on the clients. Once I finally understood that my game started performing much butter under simulated lag.

[latent heart]

Correct. You would do something like, on your PlayerController, run a "TriggerAI" RPC and send the AI character as a parameter and then the server would decide what to do with that information, such as play a montage.

(or trigger a replicated state change which plays a montage)

You can even make those things generic by the AI supplying a string or whatever as an extra parameter.

Or an enum value (though those are less generic)

[viscid night]

thanks very much

[zenith wyvern]

Is there a simple way to test dedicated server type functions in UE play mode, such as serverTravel? Or do I really need to be setting up a dedicated server to run and have UE play on

[latent heart]

I thought there was a way to get a dedicated server in PIE mode.

Not sure exactly how, though.

[thin stratus]

You can just play as client

But seamless travel doesn't work with that

For that you need to run the server and client standalone

Which is the thing between pie and actually packaging

[pale pewter]

I'm in a process of reworking my blueprints to be ran on server. for my Functions (not the events but the ones in the left side of the blueprint asset) since I cannot select them to be ran on server, I just need to create a custom event that is ran on server and then execute the function? is that correct?

then whenever I need that function ran on server I just call the ran on server RPC

[thin stratus]

Theoretically yes

[pale pewter]

thanks, I also had some events ran in the player widgets, I'm completely deleting that and transferring it to function within the player then calling that function in the widget instead

[thin stratus]

Yeah rpcs in widgets is wrong

The server RPC you mentioned has to be inside a client owned actor and executed by that client

Just as a side note

[pale pewter]

Yup got it! thank you ^^

[fluid summit]

Hi everybody! i have a listen server setup and i want to do something OnLogin only when it's the host.
Is "Is server" good for this? something i may have to worry about?

seems to work fine, but maybe there's some things to check

[thin stratus]

Wouldn't Is server return true no matter who connects?

Cause OnLogin is in the GameMode so always server?

Or was that a function you call on the PlayerController?

You could maybe check the Role of the PC?

[fluid summit]

i'm doing it on PC, it works ok. Just wanted to check in case there's some "gotcha" with that function

Another one, i'm not so sure how to workaround this.
Any way to get "Hit result under cursor" of the client, from the server PC?

i have an "interacteable" interface and in one implementation of a method from that interface i pass the PC as a reference.
I want to check what is under the client PC cursor, if possible without adding it as a parameter on the interact function

Cache the hit on the client and replicating it sems to do the work

[faint gust]

i have this code that works fine in SP and i know the issue is the camera manager because it needs an ID but the issue is i need the manager to do the line trace afaik is there a way i can get the camera manager without the id or another way to get the info i need for the line trace

[fluid summit]

I'm not sure i understand the problem.
Doing that "OnClient" and passing it to a server Request doesn't do the job?

[faint gust]

this code is gamemode code

[faint gust]

and if this code was on the client a hacker could interact with anything on the map

[fluid summit]

What about replicating the camera manager?

[faint gust]

wdym?

[faint gust]

like how would i do that

[fluid summit]

Create a new blueprint that inherits from "PlayerCameraManager" and tick "Replicate" on that BP

There may be more things to do to make that work, not sure

Also set that new BP as the Default Camera manager for your pc

[faint gust]

one thing how would it being replicated help me accsess it in the gomemode BP?

[twin juniper]

Hello, I'm making a coop game. I'm considering giving your game server to one of the clients, but I don't want my game to be cracked by hackers for multiplayer gameplay. Is only option dedicated servers?

[faint gust]

afaik the player that owns the server can do anything to it but if its coop with friends its probaly not an issue but if its randoms it would probaly have to be dedicated

[twin juniper]

why its not problem if its coop with friends

[faint gust]

well if its with friends they woldnt ruin eachother's experiance but its more of an opinion with that

[twin juniper]

How they would ruin eachother's experience

[faint gust]

i mean by friends wouldnt hack on eachother like randoms would

[twin juniper]

Cheating is not big deal

Ah, yes

My issue is playing game without buy

At the and of the day cheating is their call in game session with friends, but if they can play game without buy from steam that will be problem

[faint gust]

thats piracy you would need a form of auth with steam servers witch i am not familiar with

or some kind of auth server

afaik

[plucky prawn]

Now sure about unreal integration but steam works (bundled with unreal) can check this with like 1 or 2 function calls. This is purely my personal opinion, but piracy probably should not be your main concern. People will find ways to pirate your game no matter what. Instead you could think of it as a goal. Give them a reason to buy your game instead of pirating. Best way is good support (even when it's obvious they pirated it). At the end of the day, you cant and won't win over everyone. Maybe the fact that they pirate it shows they like your game which for me is a nice thought. Obviously their money would also be nice 😂

[fluid summit]

That's the nature of replication, GameMode is OnlyServer.
So if you have your cameraManager replicated, the version on the server will have the correct set of properties.
So whenever you need it on GameMode, grab the PC and get the correspondent CameraManager.

The problem i see with this is that you are taking client input as the final word

[faint gust]

the issue i dont even know HOW to get camera manager

and how would i verify the input is valid

[fluid summit]

From what i can see from your code, that shouldn't be on serverSide. that should be clientside and when you check your checks, you do a "request" to the server with the requiered info or update some variable so the server uses it.

what is it that you are trying to acomplish?

[faint gust]

but wouldnt that mean trusting the client?

im trying to have an interaction system

look at somthing = somthing happens / press e while looking at somthing = do somthing

[fluid summit]

I would recommend and interface

[faint gust]

i AM using an interface

[fluid summit]

the way i would recommend that handle something like that is
*Some interface for interact behavior

OnClient: Look At Something --> Does implement interact interface? (Yes) --> RPC(Server) Interact with this actor

[faint gust]

but how would the server verify that the look is valid

[fluid summit]

if the server needs to verify something, you check it on the server

so the client would "request" an interaction to the server

and on server side code, you would do your checks

in your case, if Actor "A" interacts with "B".
On the implementation of the interface on "B" you should do your checks, in your case to see if the other player is looking at him

how you check if "A" is looking at "B" is up to your setup

[faint gust]

and im trying to do a check by the server running the trace

like how would i check otherwise

[fluid summit]

Your check is your camera looking at the actor of your "character" (pawn) looking at the actor?

[faint gust]

im checking if the player is in range of the object and looking at it

with a trace

and i need the camera stuff to do that trace

[fluid summit]

the Range is easy, the looking at.
Get Pawn Forward vector and do a linetrace.
As long as character movement is replicated, you can trust its rotation and position

[fluid summit]

Do you need the camera to look at the actor or your character?
Is this FPS or TPS?

[faint gust]

its a FPS

[fluid summit]

Just do actorForward vector

[faint gust]

like this?

[fluid summit]

don't use the camera, use the player controller pawn.

[faint gust]

but then it wouldnt rotate with the camera

[fluid summit]

PlayerController-GetPawn-GetForwardVector

what do you mean? keep in mind that i only know that you want to see if the char is looking at the object and that it's a fps.

[faint gust]

like the forward vector wouldnt rotate with the camera right

[fluid summit]

if it's a fps. the actor is rotating with the camera

[faint gust]

but up and down

for some reason that dosnt work

[fluid summit]

okey, if that is the setup you want. I guess that you need to add some more info to the server.

Replicate the position of the camera would work in that case

[faint gust]

i mean i would like the actor to rotate properly

with it going up and down

like the camera looks up and down

[fluid summit]

camera should do the work, just make sure it's replicated so you can trust it's position /rotation

[faint gust]

but the tracing dosnt

this?

the thing is i would like it to work with the regular pawn vector

[fluid summit]

if you want to trust on the info you are using, it needs to be replicated. If not, you are always "trusting" the client.

[faint gust]

with this the trace still dosnt rotate but only in MP

[fluid summit]

you either replicate the camera position and use that for the trace, or update some variable "LookingAtRotation" that is replicated

[faint gust]

like this code works fine in SP but in MP it just breaks

[fluid summit]

check if the variables you are using are ok.

Print those 2 and check if they change

[faint gust]

thats just the camera compenent no vo vars like that

they seem to change

in MP the trace just stays the same up/down and is super far away

[fluid summit]

something is wrong with the way you are checking if it's looking at the actor B (also make sure actor B is replicated)

[faint gust]

nonono the trace line is broke

[fluid summit]

try this

So instead of
"Camera-GetForwardVector" You do
"Camera-GetRotation-GetForwardVector"

[faint gust]

same thing

[faint gust]

issue HOW DO I GET PLAYER CAMERA MANAGER that has been my ENTIRE issue

[fluid summit]

i suppose "interactor" is the pawn.
Get Controller -> Get Camera Manager

[faint gust]

interactor is the player

[fluid summit]

just get camera manager

[faint gust]

how do i get that node thingy because uhhh

[fluid summit]

Show the type of the "interactor"

[faint gust]

???

[fluid summit]

what actor type is this

[faint gust]

its a BP Player Objecy Reference

[fluid summit]

Cast is to your player controller first

i assume that by "player" you mean that it's the player controller

[faint gust]

no its the player

just player

[fluid summit]

Can you show me where are you calling that? to see what actor type you are trying to get the camera from

[fluid summit]

Holy crap, please don't do that

[faint gust]

what did i do thats so bad?

[fluid summit]

This is being called from the player controller? the pawn?

[faint gust]

no just the player

[fluid summit]

RPC on Tick, i would change it later

[faint gust]

not the conmtroller

[fluid summit]

i don't know what "just player" is

[faint gust]

the pawn

i cant get the terminolgy right im sorry

[fluid summit]

if it's a pawn and the camera is on the pawn, cast it to "your pawn type" and GetCamera should work.
If not, apply an interface to get the camera, check if that actor implements it.
if it does, add a "get camera" method to that interface

and implement that interface on the pawn

[faint gust]

like im able to get the camera but not the manager

[fluid summit]

you can pass whatever you want on the interface

for the camera manager i think you need to do "Pawn -> Get Owning controller -> GetCamera manager"

not sure

[faint gust]

there is no owning controller

[fluid summit]

https://forums.unrealengine.com/t/how-can-i-get-the-player-controller-out-of-a-pawn/378147/3

[faint gust]

and on the controller there is no camera manager

ok i got the manager

issue
Blueprint Runtime Error: "Accessed None trying to read property CallFunc_GetLocalViewingPlayerController_ReturnValue". Node: Line Trace By Channel Graph: Interact Trace Function: Interact Trace Blueprint: GM_default

[faint gust]

ah

i keep forgettign about casting

[fluid summit]

that's the default player controller class

[faint gust]

it fails to cast

fixed the casting

buuut issue

it always says 000

[fluid summit]

that's not a fix, you are ignoring the cast.
all after the "Cast to Bp" is gonna fail if you ignore it

[faint gust]

nonono

i did fix the cast

thats just logginf

[fluid summit]

if that is the case, check if the variables you are checking are replicating correctly.
Do a print on client and on server of the same variable

[faint gust]

still works

wait how do i replicate that

[fluid summit]

Details -> Component Replicate
Make sure base actor is set to replicate

i highly recommend to read the compendium, this are more of BP things more than multiplayer

but if you are struggling with those, i would first get more practice on those and than get into MP.

[faint gust]

this is set to repicate

[fluid summit]

So you do have the camera on the pawn... -.-

[faint gust]

the camera is on the capsule and thats what moves right?

[fluid summit]

the capsule is the capsule, your camera has a diferent position on that setup.

implement an interface so you dont need to do the cast

that interface needs a "GetCamera" method and Outputs a camera

make your BP_Player use that interface and on the implementation of the "GetCamera" Method, just return that camera that is on the spring arm

[faint gust]

like this?

[fluid summit]

yap

Or maybe go more generic and use the method to get the "look at rotation".
so no matter what actor type is the interactor, you only need to check if it implements that interface

[faint gust]

coulndt it lie about the rotation?

maybe like this

[twin juniper]

Do non-animated bones have an effect on replication and bandwidth usage?

[faint gust]

i give up its 12PM im going to sleep

[twin juniper]

😄

Nighty nigth

[fluid summit]

Use "Get camera rotation" Not "Get camera location".

and if it's replicated, no. it can't lie about the rotation, the only value that matter is the one on the server

[faint gust]

if i were to have the function on the client be replicated on the server would that mean it cant lie about it?

[fluid summit]

you are making the call from the GameMode, the function is going to be made on the server unless you specify that it's on the client.

What you are going to do is check the those property on the server version, you need to make sure those values are updated.

You can't lie if you are checking the server version, unless you give the player a method for update those values that they can access freely

Check cedric multiplayer compendium

https://cedric-neukirchen.net/

[faint gust]

The reason I put it into the server is because I don’t know how to check it without just putting it into the server and that dosnt work

I just want to secure this and I don’t know where to go in that big pdf for help

[fluid summit]

if you don't put it on the server, you can't trust it.

if it's not on the server, you are basically getting a "trust me bro, it's the right one" version of whatever you are reading

[faint gust]

Yeah and I just can’t get the camera stuff onto the server for some reason

[faint gust]

still dosnt work

[fluid summit]

don't use "camera manager" if you have a camera with a spring arm on your pawn

drag that camera variable that its on your pawn

[faint gust]

world rotartion right

still nothing

and this is the same issue

this interface foxes nothing

[fluid summit]

that camera is not replicating correctly

[vague spruce]

hi, need some help here. i have a component that is set to replicate. it has a TArray in it that is set up with replication AFAIK. for some reason, it's not replicating correctly and i'm not able to see the updated values on the editor.

    BestiaryComponent = CreateDefaultSubobject<UBestiaryComponent>("BestiaryComponent");
    if (BestiaryComponent)
    {
        BestiaryComponent->SetIsReplicated(true);
    }

    UPROPERTY(VisibleAnywhere, Replicated, ReplicatedUsing=OnRep_ReplicatedEntries)
    TArray<FBestiaryEntry> ReplicatedEntries;

void UBestiaryComponent::GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const
{
    DOREPLIFETIME_CONDITION(ThisClass, ReplicatedEntries, COND_AutonomousOnly);
}

any thoughts on why this could be happening? i'm at a loss here... i was also able to confirm that the TArray is getting updated on the server

[lost inlet]

why is it not calling Super, also did you pick the right condition, and is the owning actor itself replicated?

[vague spruce]

omg

if it's that i'm not calling super i am going to facepalm so hard

[vague spruce]

yes the controller is replicated AFAIK and yes, this condition works with another component with the same composition. just not with TArray. but let me try with Super

sigh naw that didn't do it. what's weird is that another component that has the same layout as this one is working fine. these values are simple floats though.

replicating fine

not replicating fine

(map does not replicate, just need the array to replicate)

[lost inlet]

why would you even need replication conditions if it's a component of a controller, which is replicated to a single client anyway

[vague spruce]

i'll take off the conditions, maybe that's what it is

[lost inlet]

and SetIsReplicated is usually not called during the constructor, you typically use SetReplicatedByDefault

and you can just put that in the constructor of the component itself

[vague spruce]

super cool, lemme do that too. was following UE docs

christ yea, none of that is working 😦

are TArrays supposed to replicate when an element is added to them?

this is a TArray of structs so maybe that's the problem?

i added UPROPERTY() to the fields in my struct and now the struct is replicating fine

[fluid summit]

One question, does anyone know if a reason to why a line trace is hitting in case A but not B?

A)

B)

if i do the exact same trace using the player pawn, work ok when doing it from a RPC on PC.
But not when using the PC reference on a replicated actor

Pawn is valid on both cases and location is the same

Found it: Ignore self

[pale pewter]

I'm learning a lot about multiplayer and RPC, but I've got a question. If I run an event on server but I also want the client to see it (I'm adding an item to the player but I want it to be set on server) I should run the event on server first then run the event on the client so they are in sync. Is this correct?

Same as sprinting, Run event on server to set the speed, then on the execute set it on the client

[twin juniper]

Please help.

[rocky night]

Hi, i got a thing…. 🫠When i Testplay with a friend my Game ( he is host iam client) after like 15 mins the host looks on my side like he is falling through the floor every few seconds. Anyone know what that could cause?

[pallid mesa]

no, take a read at this https://vorixo.github.io/devtricks/stateful-events-multiplayer/

[pallid mesa]

Take a look at sixdof plugin from mookie

there's also this https://www.unrealengine.com/marketplace/en-US/product/easy-flight-model

Worked with Mookie before, you can trust all he does

[rocky night]

anyone?

[twin juniper]

Do non-animated bones have an effect on replication and bandwidth usage?

I have facial rigs and I will never use them in my fps view. Should I delete them?

[rich vine]

Hello, I want to create a listen server without port forwarding. How can I do that?

[twilit radish]

You either use some kind of service to help you with achieving the 'same thing' or you're stuck to LAN. Listen Servers them selves don't have anything to do with port forwarding. It's just a way to setup the game.

Epic Online Services provides p2p connectivity, Steam does for their own platform too etc. Look around what you want to use or can afford to use and see if it's something for your game. Do look at their limitations though. There are very likely a few of them.

[faint gust]

i have this code in SP it works and it traces the line perfectly but in MP it always points to 0,0,0 i know its an issue with replication but i dont know how to have this replicate

[twilit radish]

The start or end variable is 0,0,0?

[faint gust]

lene do a print rq

no its not 000 but it just works diffrently

it just looks like it points to one place

[twilit radish]

Is this on a client or server?

[faint gust]

server

that code is server

here is a video of what happens

[twilit radish]

Isn't it just lagging behind?

[faint gust]

it dosnt interact with anything though

even when its still

[twilit radish]

But the ray seems to at least follow the camera no?

Just with some delay I think though. Which is to be expected.

[faint gust]

it dosne go up/down

[twilit radish]

Are you sure the camera gets rotated then on the server?

[faint gust]

do you want a video of what is meanrt to happen?

[twilit radish]

I think I know what you want. But what I think the mistake here is that the camera doesn't move up or down on the server.

Rather just only on the client.

[faint gust]

like in SP it dose exactly what i want

[twilit radish]

But something that works in SP isn't at all guaranteed to work in MP 🙂

[faint gust]

i know

just odd how diffrently it is

[twilit radish]

I'm not entirely sure yet but I simply assume that the Camera doesn't send it's rotation to the server. Which means that likely you only get rotation currently because of the player character it self rotating.

[faint gust]

yeah because the player dosne rotate up/down

[twilit radish]

Yes.

[faint gust]

i mean there has to be a diffrent way to get this setup that works

[twilit radish]

I assume you just rotate the camera on the client with local input?

[faint gust]

yeah

[rich vine]

When you give the server to one of the players, shouldn't that player do port forwarding?

[faint gust]

this is movment code

[twilit radish]

A listen server exists on someone's PC. Most routers these days block random incoming traffic to your computer for obvious reasons. So you need something that does expose it to the internet. Either port forwarding or using EOS, Steam or whatever to make that happen. You could even roll a custom solution but I would not do that honestly.

[faint gust]

there is UPnP if UE5 can use that

somthing like this

[twilit radish]

Did you use a Character or Pawn as base class, Evan?

[faint gust]

charafter

[twilit radish]

Sorry this took some time to find because.. Yes. But I think what you can do is set UseClientSideCameraUpdates to true in the Camera (manager?) and it should properly send the rotation of your camera.

Should just be a setting somewhere in the details panel.

[faint gust]

where would i set it in the camera manager

as i dont see a manager

[twilit radish]

Let me look real quick in a project.

[lime iris]

Question: What happens if a client joins a game in the middle and wants to get an update of all recent variables replicated which are crucial to gameplay while other players keep doing thier thing (especially using reliable), wouldn't the client miss one or two important updates? What would be a proper way doing replication in the middle of a game? Should everyone just wait?

[twilit radish]

This is why the replication system exists. It should be used for stateful actions as it will just throw the values it currently has to the joining client.

If you use RPCs for everything, then you indeed will get the problem that nothing will be send to that client.

[lime iris]

I am worried about that exactly...

[twilit radish]

If you use the replication system for things then there's nothing to worry about except maybe some edge cases you forgot to deal with. But if you have used RPCs for literally everything you have a problem yes.

[lime iris]

Is there any other way than forcing players to wait until it's safe to sends RPCs again?

Not everything, but I have some for gameplay, because the execution order is crucial...

[twilit radish]

I don't see why you need to let players wait in the first place?

You would normally let the joining player wait until everything properly has been setup for them and mean while have the match move on. I would highly advise just using the replication system and making use of it's priority system, but yes you can technically resync everything through RPCs.

Also @faint gust I found it. Not straightforward to find lol. So it's in the PlayerCameraManager which you can change in a player controller's detail panel with a custom BP.

You can either do it that way or just send the pitch your self through an RPC.

In the CameraManager you can define this.

[faint gust]

its on by default dose that mean it would be on on the original class

[twilit radish]

That's a good question actually.

I would assume not because otherwise I would assume your trace should just work? Unless you're not using the correct rotation in the first place.

🤔

[faint gust]

and using an extended class dosnt work

it must be an issue somwehere else

[lime iris]

Because the RPCs might be flying around when the new client is just joining (can miss important RPC because of latency, just hypotheticalzzz)

[twilit radish]

It's indeed set to true by default. Then I guess it's a different issue yeah.

[twilit radish]

Well that's exactly why the replication system exists.

That makes sure to try and try again.

Evan. Could you print out the rotation of the camera?

[lime iris]

Okay, I may have to refactor the logic... but when to use RPCs for then?

[faint gust]

the forward vector?

[twilit radish]

RPCs are most commonly used for Client -> Server and one time events like "I shot my weapon".

[twilit radish]

No the actual rotation.

The Pitch, Roll, Yaw.

Then you can see if it updates on the server or not.

You can also do the forward vector but I find it a bit confusing personally 😄

[faint gust]

it seems only the YAW moves

[lime iris]

So... RPCs are not for a multiplayer puzzle game then...

[faint gust]

the others go from 0 to -0 somtimes

[twilit radish]

They can definitely be. It just really depends on what it is used for.

[lime iris]

Let's say the game is like chess and every move (the order) is crucial, what should I do then?

Just make the other players wait is the only thing I can think of...

[twilit radish]

If it's chess IMO Unreal's replication system is way overkill.

[lime iris]

No, it's not chess, but just an easy way to decribe the gameplay (it's experimental...)

[twilit radish]

Also @faint gust I do have to go do something else. What I would recommend is trying to see if you can find something that does make sure the pitch also gets send to the server. I'm not entirely sure currently why it doesn't work 😦

[faint gust]

i think we should take a break and do it another time

[twilit radish]

Ah I see. But my point still stands. RPCs should just be used for Client to Server communication as replication only goes from Server -> Client and any "States" should generally be in the replication system instead of RPCs.

[lime iris]

I may have to think things over... thanks Thom, helped a lot!

[pale pewter]

Thanks vori for this info! but I don't think OnRep is good in this situation, what i'm doing is when a player picks up an item, the event to pick the item and set it is ran on server and then on execute the non replicated event is called from the client too so there is no delay and the client can see the picked item quickly. is this action correct?

[faint gust]

can anyone help me with this as i cannot figure it out as it seems it just dose not goto the server

[swift pulsar]

Hi guys, do you have any hints on how to properly handle players entering vehicles, possessing vehicles and attaching player pawn to it in the multiplayer setup? My main problem is that when I possess the vehicle and attach the player pawn, the vehicle movement seems to be glitchy because of the attached player. I suspect it might be connected with the Character Movement Component of the attached pawn. Deactivating it fixed my issues, for the most part, but I'm still wondering if perhaps there are any recommended techniques to use.

[pallid mesa]

no

use a replicated variable

otherwise if someone joins won't see the "apple"

that's what the article is about

XD

[pale pewter]

Sorry my variable is set to be replicated (But not RepNotify) i didnt set it in the screenshot example. but since I only want the server and the client to set the variable and for it to quickly set and appear for the client I still don't think RepNotify is needed and wondering if calling server event and then non replicated afterwards is fine

[swift pulsar]

It depends on whether you want other players to see this item or not. If you want other players to see it, then you need to replicate this to all clients, not only the one responsible for the Pick Item action. Also, if you want players who join the game later to see this item, you need to use Rep Notify specifically.

[sacred kraken]

How do I host servers for my multiplayer games? I just learned that epic online services and steamworks are for other networking stuff, like voice and matchmaking. I always thought it was also for hosting but I was wrong. So, I set out to learn how I should host my servers and keep things fast. When googling I found a ton of info and it looks like I have a lot of options. I was hoping someone with experience in here could help me narrow it down.... What's the correct path?

[pallid mesa]

it depends on the logic stack if you things when you obtain the item then yeah, onrep, otherwise simply a replicated variable would do

In Unreal you have two natively supported options @sacred kraken :

• Listen Server: One of the players hosts the session (ideal for low-player count setups)
• Dedicated server: A headless server is instanced and everyone who joins it is a client.

[proper mantle]

Trying to start a server with a client using ThirdPerson C++ template. But only getting a black screen when trying to connect with the client:

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

Starting server with:
"G:\Programs\UnrealEngine\UE_4.26\Engine\Binaries\Win64\UE4Editor.exe" "D:\Projects\UE4\PuzzlePlatforms\PuzzlePlatforms.uproject" -server -game -log

Starting client with:
"G:\Programs\UnrealEngine\UE_4.26\Engine\Binaries\Win64\UE4Editor.exe" "D:\Projects\UE4\PuzzlePlatforms\PuzzlePlatforms.uproject" 127.0.0.1:7777 -game

Server log:
https://gist.github.com/KulaGGin/c43dc0fe84f42924e21a0666683cbba2

Client log:
https://gist.github.com/KulaGGin/1ccbdd6dbdab180360472139dcc6c836

I also tried connecting the client using my actual IP address:

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

With the exact same result

Someone please help
At the end of the logs it gives a warning in yellow:

[2022.06.26-15.03.19:655][365]LogOnlineSession: Warning: OSS: No game present to join for session (GameSession)

[sacred kraken]

I think I mean dedicated. I don't want one of the players to host since that's (as far as I could see) a pita to do network wise.

So I just shove it on aws or something like that? There's no "epic approved" way of doing things?

[pallid mesa]

the only PITA is that the host could cheat

other than that is what I would recommend for COOP setups or for low player count in which inter-player experience isn't very relevant

[sacred kraken]

What? How do I make a host accessible? Wouldn't they need a vpn or reverse proxy or something like that?

[pallid mesa]

no, you'd use an online subsystem, like steam

it handles nat punchthrough for you

[sacred kraken]

Oh dang, that's cool, I didn't know

[pallid mesa]

you login to steam, register your listen servers, and other peeps will be able to discover it

[sacred kraken]

So it's like a STUN server in webrtc?

[pallid mesa]

login and registering are parts of the game code, this doesn't mean: going to steam and clicking somewhere so my server disappears

[sacred kraken]

I see. All right, and for standalone I'd need something like aws?

[pallid mesa]

@sacred kraken take a read https://docs.unrealengine.com/5.0/en-US/common-user-plugin-in-unreal-engine-for-lyra-sample-game/

[pallid mesa]

for dedicated yeah, you'd need to have a machine or machines dedicated to host your servers

that can be nitrado... aws...

[sacred kraken]

I'll have 8 players and I'm running on a quest, so I think I'll need a dedicated server but at least now I understand what to test

Thanks

[pallid mesa]

no worries, bare in mind that listen servers provide longevity to your product

@sacred kraken

[sacred kraken]

What do you mean?

[pallid mesa]

or you can simply give your players the dc server binaries

because listen servers are "self hosted"

you don't have to pay for servers

[sacred kraken]

Oh right

Well, I suppose I can build support for both

[pallid mesa]

another option as I mentioned is providing the dc srever binaries to your players

[sacred kraken]

It's really a matter of "what do you connect to" isn't it?

[pallid mesa]

so they can host their own dc server

[sacred kraken]

What's a "dc"?

[pallid mesa]

yes, fortunately the differences between programming for a dedicated (dc) server and a listen server are minimal

[sacred kraken]

aah, got it

[pallid mesa]

just a couple of things to have in mind, the dedicated server instance isn't a player, thus doesn't need to care about particles, sounds... yada yada yada

[sacred kraken]

It's the same thing just a different build (headless), from what I've read so far

Right, yeah

[pallid mesa]

very very similar, yeah

not the same, due to what I mentioned before

[sacred kraken]

I'll first focus on actually finishing the game then.

[pallid mesa]

well

If I were you I'd focus on multiplayer starting from now

[sacred kraken]

And then I can see what the overhead is of a listen server with 8 players

[pallid mesa]

just be sure your features work in dedicated server and listen server

through the Play in Editor menu

otherwise i'd be too much work

[sacred kraken]

Oh, no I am building it with multiplayer from the start

[pallid mesa]

because converting a Singleplayer to a Multiplayer is suuuuper bad

oooh good good 😄

👍

[sacred kraken]

I just thought my code would be different based on hosting. But I didn't know it was actually quite simple 😄

[pallid mesa]

well be sure it works for both

dc and listen

because the fact that the server is a player adds some differences

you know how to test it, right?

[sacred kraken]

I mean, I just press play and test. Locally I test by ruinning using -server. In the editor I just set it to listen, with 2 players

-server for the server and standalone builds for my pc and quest2

[pallid mesa]

to have a proper test setup: listen 3 players, dc 2 players

and test with network emulation settings + resiliency to late joiners

in "editor preferences" there is a tickbox that says "allow late joiners"

relevancy and late joiner issues are very popular

so be sure you prepare for them

here in my article I explain that: https://vorixo.github.io/devtricks/stateful-events-multiplayer/

[sacred kraken]

Oh great, I'll have a read!

I've been throttling using my router, setting bandwidth limits like a pleb :p

[pallid mesa]

oh there are network emulatio settings in the play in editor settings haha

i don't speak about that in my article, but worth knowing 😄

[fathom aspen]

If you look last line in server log you can see that the join by client succeeded. It's also mentioned in the client log("Welcomed by server"). You are not specifying a map when you do the joining so you are redirected to the startup/default map called Entry. It's prolly a black blank map so that's why

[pallid mesa]

just tried...
Server: -game -server -log
Client: 127.0.0.1 -game -WINDOWED -ResX=800 -ResY=600

And for me it works, if it gets stuck focus on the dc server console and hit enter a couple of times...

oh yeah xD

also that.

[sacred kraken]

Ooooooh, that's what you meant. Not a problem, I got that part down 😄 State vs events are concepts I am familiar with. Thank you for the warning though, and don't stop sending warnings my way because I like it 😄

[pallid mesa]

yeap i dropped at you loads of advices because I don't know how much you know, so better to be safe than sorry

also in the article you can see how to enable the late joining thingy

[sacred kraken]

I agree, and I thank you 😄

The first time I encountered this was when I still built video conferencing software. There was a whiteboard and a chat. The first dev made the whiteboard draw using events so late joiners only saw the delta.

[proper mantle]

Thanks, that was it! Had to specify the map and now it works.

Thx guys

[uncut schooner]

GAS is not good for certain things at this stage, its good for instant effects but not duration modifiers, So if your making a survival game it would probably be better to do the prediction and serve authentication manually, however a good game that GAS would be really helpful for would be like Overwatch, then you'd probably only need to do custom fire rate timers and implement movement abilities in your CMC

[light iron]

GAS also has built in Tasks for movement.

[gleaming kite]

Will begin play always fire before a client calls the login method?

[uncut schooner]

Ah, Haven't checked that out

[fathom aspen]

When you say BeginPlay you should specify a class. You prolly mean a player specific class and the answer is no. Also fyi login methods aren't called for seamless travel. That's why you should use HandleStartingNewPlayer instead as it gets called for both hard and seamless travel

[gleaming kite]

Sorry it was just a player start class. I have a player start that has a gameplay tag exposed to the editor so i can set what tag the player start has. When the client is spawning, it choses the proper player start with the tag. I recently found out that editor set properties are not available in the constructor so was wondering if it was safe to put the add tag method in begin play. (Also i know player starts have tags by default but i want to use gameplay tags so there isnt a typing error and you dont have to make sure its exact everytime, also just for other gameplay tag functionality)

[fathom aspen]

Then yes it's prolly called as it's preplaced in the level

Yes you can call it in BeginPlay or PostInitializeComponents

Both are safe places

[faint gust]

question why dose the get location and forward vector give completly diffrent value in MP compared to SP making this completly not work and make me spend hours and having nothing work

[gleaming kite]

PostInitializeComponents works great, thank you!

[fresh chasm]

Hello, I'm having trouble to replicate a TArray of UObjects inside a TArray of struct.. If I put the array outside of the struct it does replicate correctly, is there a limitation with that?

USTRUCT(BlueprintType)
struct FInventory
{
  [...]
  UPROPERTY(VisibleAnywhere, BlueprintReadOnly)
  TArray<UInventorySlot*> Slots;  
}

UCLASS(Blueprintable, ClassGroup=(Custom), meta=(BlueprintSpawnableComponent))
class INVENTORY_API UInventoryComponent : public UActorComponent
{
  [...]
  UPROPERTY(EditAnywhere, BlueprintReadOnly, ReplicatedUsing=OnRep_Inventories)
  TArray<FInventory> Inventories;
}

[chrome quest]

You're sure the struct itself is replicated.

[fresh chasm]

Yes it is, I tried to replicate a TArray of int inside the struct and it worked

[fathom aspen]

This shouldn't be the case. Look through this channel search and see how other people have done it(many examples really). For example: #multiplayer message

[chrome quest]

Oh.. the objects have to be made to support replication

Which objects are they? Parent class?

[fresh chasm]

I have this in the UObject :

virtual bool IsSupportedForNetworking() const override { return true; }

[fresh chasm]

It is a class directly derived from UObject

I can paste code related to replication if you need

[faint gust]

the issue they are using the camera manager witch i cant get on the server without it erroring

[chrome quest]

This should be fine.

I can't remember the full code but there's a bit more I did to enable replication for objects

[faint gust]

with the manager i get this errror

[fresh chasm]

The other thing I did is override "ReplicateSubobjects"

It is working fine if I make the array of uobjects outside of the struct, but it doesn't replicate if inside

[chrome quest]

But since it replicates outside the struct, I'm not sure what is happening. It's a UPROPERTY in the struct right?

[fresh chasm]

yes

[chrome quest]

Strange. That it's not working. Works fine for me

[fathom aspen]

Well it's saying GetLocal.. so it's a client only thing and you're doing it in the GameMode which is server only. Read the compendium which you can find in pinned messages.

Also you shouldn't be doing your traces on server

You do it on client and make the server do the calculations to make sure it's okay

[fresh chasm]

Maybe It needs additional setup since it's in a struct?

[faint gust]

the issue is how would i trust the trace on the client? and i dont know how i would do the calculations without a trace

[fathom aspen]

Same question goes for people that do client side movement prediction. You predict

[chrome quest]

Not really.

[fathom aspen]

If everything happens on the server then the server will go crazy

[fresh chasm]

Also I should add that the struct is stored in an Actor Component

[chrome quest]

Maybe depends on how you're creating the object.

And adding to the array

[faint gust]

but like how would i predict it

[fresh chasm]

The array has predefined size, elements are just changing inside

[chrome quest]

Okay. Not sure what is happening then

[fresh chasm]

I will try in a new project, maybe there is something interfering

Thanks for your help 🙂

[quartz iris]

How would I go about revealing certain players in the gamemode, i already have a material for highlighting the player through walls i just need a system

[fresh chasm]

Oh I made a mistake in my first post (edited), it's an array of UStruct, and inside the struct there is an array of UObject. Don't know if it changes anything

[chrome quest]

I don't think it changes anything.

[fierce fiber]

Is anyone free to help in a VC call with some kick players related problems Im facing? I'll probably fail to explain my issue here

[fresh chasm]

That was the issue

[chrome quest]

The way you were adding?

[fresh chasm]

Yes I don't know what is wrong in the function that was adding yet but adding manually on the server just works

[chrome quest]

Ah ha. I was half right.
Yeah, you should only be adding on the server

Nice solving it

[fresh chasm]

Thanks again 🙂

[twilit radish]

You could also just use the controller rotation

which is way easier now that I think of it LOL

[faint gust]

the thing is if it is jank it may be better to do a more useal soulution that may have better performance right

[faint gust]

aswell wizard siad it wouldnt be good to have it all on the server and i can use perdiction to check if its valid or somthing

[quartz iris]

How would I go about revealing certain players in the gamemode, i already have a material for highlighting the player through walls i just need a system

[fresh chasm]

What do you mean by "revealing certain players in the gamemode" ?

[quartz iris]

Reveal them through walls

It's for an xray ability

[twilit radish]

Well yes it costs a bit of performance. BPs aren't really cheap in general. Traces are completely fine though, barely have any performance cost. But I asked you before if you wanted to do traces on the server 😛

[faint gust]

🎉🎉🎉 it works

[fresh chasm]

When the player press the button to activate that ability, run a server event that checks if the ability is not on cooldown (if any), then run a client event, and get all actors and swap their material with the highlighting material.
To get actors, you can do a sphere trace on a specific channel that others actors that need to be highlighted respond to for example

[faint gust]

i think if it dose become an issue it shouldnt be too hard to make the trace a client and fix up some perdiction/checks when i have an expanded brain

[twilit radish]

Also @fathom aspen you can't possibly "predict" a trace of the client being valid without doing it on the server too. It's however not possible without rewinding physics. But I explained that to Evan before 🙂

[chrome quest]

Try 10000 traces on tick. 🥲
I'm currently hitting a performance bottleneck with that.

[twilit radish]

If you want my opinion. If cheating becomes an issue and your game is big start worrying about stuff by then 😄

[twilit radish]

1 single trace on tick is absolutely nothing though.

[chrome quest]

True, true

[faint gust]

well its a trace per player and i plan on having large servers although distrobuted

[faint gust]

yeah but i think fighting some cheating is good with somthing with a simple soultuiton like this

although hard to find

[twilit radish]

Technically all you need to care about on the server is one trace upon the RPC arriving.

This is definitely not a simple solution.

[faint gust]

yeah

[twilit radish]

Doing a trace on the server lags behind like I've explained before. Fixing that 100% is really difficult and not possible in BP whatsoever.

[faint gust]

for the lag i may do a shpere cast witch will have some leanency

[twilit radish]

Whatever does the trick I would say without impacting players too much 😄

The advice I was given at some point that I now give to others is worry about your game working first and having players before worrying too much about cheats.

[faint gust]

and thom thank you for making my game posible

[twilit radish]

Cheaters will cheat anyway and crush your productivity if you try to make everything cheat proof 🙂

[faint gust]

il credit you 100%

[faint gust]

yeah but stuff that is cheap to prevent shiould always be done