multiplayer

[thin stratus]

Sorry to hear that, I don't want to demoralize you. If at all I would want you to extend your skillset and learn C++ first.
It would just be very sad to see someone burn out on an idea they can't reach right now.

Actually, doesn't need to be client authoritive, but would make things easier.

[mellow solstice]

yeah, I am aiming for physics a bit similar to rocket league I guess. Vehicles are made out of destructable voxels. There should be no input lag heh

[nimble trellis]

@thin stratus the funny thing is.. ive burnt out on this dream idea of mine before. it was incredibly fun in playtests (its a smash bros style FPS game). problem was, back then i couldnt model or rig/animate at all. now i can. and the last hurdle at this point really was just the netcode. and i wanted to tackle it again, id stay up 20+ hours straight reading doccumentation on netcode/rollback netcode, network fundamentals. have been the last 2 weeks or so (which is roughly how long it took me to learn to animate/rig skeles to the level that i wanted to do. and then.. reality set in, and netcode turned out to be infinitely harder

ironically the last thing i had yet to be able to tackle, is the most important in a multiplayer game lol. the world has a sick taste of irony like that lol

[thin stratus]

Yeah, NetCode is quite tricky.

[nimble trellis]

yeah its pretty brutal. but i guess its better that i realize it was a dead end now, then spend another 2 weeks trying to figure out how to pull it off in BP

[peak sentinel]

Can someone explain the magic behind the bAllowAutomaticWeaponCatchup in ShooterGame?

I just implemented it to my own custom weapon system and it solved the sync issue between server and client

From what I can see if current fire time - last fire time is higher than time between shots it fires the weapon instantly 🤔

Damn its clever

[thin stratus]

I assume it's basically so that you don't have to time the press as a player that much?

Haven't looked at it though

[peak sentinel]

I guess it lets you fire the weapon instantly if you are still shooting the weapon but lagging behind the owner controller's burst counter so you catchup to its counter

Like this

In the end, both authority and autonomous proxy fired same amount of bullets

Sometimes when releasing the trigger server goes out of sync and fire an additional bullet that autonomous proxy didnt, but I dont know how to solve that yet

[trim kindle]

Will be CDO object pointer properly resolved if replicated?

[chrome bay]

Should do since it's stably named

[trim kindle]

nice, thanks!

makes sense

[nimble trellis]

@thin stratus sorry for the dumb question, but are there any particular ue4/ue5 c++ courses/resources you think would be particularly useful for this whole ordeal for me that i could go check out? im not ready to give up quite yet . ill humor my attempt at this lol

[uneven flicker]

can anyone explain me why this isn't working?
When a client shoots, the server and the rest hears it, but when the server shoots, only the server hears it

[fathom tinsel]

Can you check it without the weapon attenuation?

[uneven flicker]

ok wait

[uneven flicker]

it still doesn't work

[thin stratus]

Not sure tbh. I rarely use any courses

[peak sentinel]

So anyone has any idea for this? I'm trying to understand how ShooterGame prevents authority to fire more bullets than owner client when fire input is released, but could not find how that magic works yet

When ping is higher than fire rate of the weapon, server always goes out of sync and fires additional bullets which makes ammo different in client and server

[slow wing]

Can someone shed some light on how root motion sources work when networked. I know the saved move system exists, am I correct in assuming the server doesn't extrapolate in normal motion but will only ever move based on received moves from the client? Is this also the case with a root motion source, or does the server actually "simulate" the root motion source?

Say a client has really high packet loss but manages to initiate a root motion source, will the server actually simulate out this source or only update the pawn if it receives new moves from the client?

[grand mica]

any tuts for networking with c++

someone would like to recommend?

[lost inlet]

the pins

more specifically the compendium which is the 3rd pin

[grand mica]

you could tell me this in #cpp as well 😛

[light iron]

Exi, before you said you use an invincible tag for ignoring damage like iframes for a dodge. Does this just entail every Gameplay effect checking if player has tag or not in the damage calculation?

[static lynx]

I have an actor that rotates at a slow rate. Because it's slow, the client rotation updates seem "jerky", as opposed to other actors that don't rotate slowly. Singleplayer doesn't have this problem.

Is this some sort of bandwidth saving mechanism that limits the frequency of movement updates?

If so, what is the best way to solve it? Should I lower the sensitivity somehow, or should I replicate the new rotation to all clients, and lerp it over the delta?

[ashen stone]

on ReplicationGraph at RouteAddNetworkActorToNodes is it normal for ActorInfo.Actor->GetNetConnection() to return nullptr for Player Pawn and Controller?

[fathom tinsel]

GetNetConnection returns nullptr when called from local players on server

[thin stratus]

We check that in the damage execution via the target tags

[mint nymph]

hey guys i am trying to spawn a dice on a player pawn it was working fine but now it just stopped working idk what i did

[mint nymph]

ok just started to bug test more the spawner only works on standalone and not client, assuming the pawn isnt replicated for its location anyone know how to do that

[thin stratus]

GetPlayerPawn(0) will get you a specific pawn, probably the Servers only

If you need this to spawn on each player, then you need to make sure you also reference each player

[marble gazelle]

I think it depends where this code runs.
On the server I think its the order of players joind, but not sure if the order is preserved.
On clients I think that GetPlayerPawn(0) should give you the local player, but I'm not 100% sure, there just something in the back of my head telling me that ^^'

[stark tree]

Hi, I'm making a basic Unreal multiplayer game.

1. Check if any session is found, if not create a new one.
2. If any is found, join it.

First player starts the game and a new session is created. Second player joins it.

Problem is, this works totally randomly- sometimes the second player finds the existing session and joins it, sometimes it doesn't find it and creates its own making both players in different sessions of their own.

Surprisingly I fixed this problem temporarily by switching to a different WiFi on both devices. It worked twice. Then I switched back to my original WiFi and it worked again. But then the next time it didn't. And now it doesn't work on the second wifi either. It's very confusing. Any idea whats going on?

[warped berry]

I have the client call a server RPC through player controller, and inside that server RPC I'm calling a multicast RPC but it doesn't get called on all clients? I think I'm missing something trivial

[marble gazelle]

Player controller is not replicated to other client's aside from the client that controller belongs to

[warped berry]

but shouldn't the server RPC execute on server send to all clients?

[marble gazelle]

Sure and it does that, but there is only one client that has this actor, so multicast is like single cast to client

[warped berry]

Oh okaay, so I should move the multicast to the character class for example?

and the server RPC as well, right?

[marble gazelle]

Depends on the usecase^^ but if it is smth that should run in context fo the player character, yes. But don't forget the player char is only replicated if in range

depends >.>

[warped berry]

it basically triggers a celebration animation which I want all players to see the scoring character playing that animation

the server RPC is to inform the server which animation the player chose and then the server sends to all players

[marble gazelle]

then the RPC To client should be on the system that is responsible for the your reward system.
Then this system should trigger the client feedback on the character^^

but actually it doesn't matter which system sends the RPC to the server, but it sound's like a PlayerController job

[warped berry]

I'll think about it, thanks mate xD

[marble gazelle]

^^ any time

[stark tree]

Can someone please help?

[marble gazelle]

race condition? do you connect them at the same time?

[stark tree]

Can't be, I am the one using both and I do it one by one. Also worth mentioning that these are 2 VR headsets, I'm doing VR multiplayer. However whatever I have done seems to work and not work randomly.

[warped berry]

I don't think it has anything to do with WiFi

are you using UE sessions interface?

[stark tree]

Probably, I just thought I would mention that it works randomly if I switch wifi, but then sometimes it doesnt

[stark tree]

Let me show you

Is there any way to upload blueprints somewhere without having to take 10 screenshots of it?

[warped berry]

https://blueprintue.com/

[stark tree]

Do I have to make the whole blueprint on this?

Sorry never used it

https://blueprintue.com/blueprint/ozyrv16e/

Figured it out

Thanks

Forgive the mess.

[warped berry]

no problem, so you're using a plugin and I don't know if there's something needed for it, but I can give you a link that will give you an idea of the whole thing

it's in c++

https://cedric-neukirchen.net/2021/06/27/ue4-multiplayer-sessions-in-c/

[stark tree]

thank you very much!

[thin stratus]

Hm, it seems like enabling Ragdoll Physics while running doesn't carry over the momentum to the Ragdoll Mesh on Simulated Clients.

So I basicaly fall just downwards instead of foward in running direction

[split sentinel]

Hello, i have a problem where i can equip (spawn) a gun with "UPROPERTY(ReplicatedUsing=OnChangeWeapon)" (and it works perfectly fine on all clients), but when i try to destroy the gun, it only get's destroyed on the local client.
How can i make it that it get's destroyed on all the clients? Here is my code:

https://pastie.io/iaxkcj.cpp

https://pastie.io/vwohny.cpp

[thin stratus]

1. DestroyActor should only be called from ServerSide for replicated Actors.
2. Use Gun->Destroy() instead of asking the World.

[split sentinel]

still doesn't work

[thin stratus]

Then you are relying on the OnRep for the Server

Which is wrong

At least by default

OnRep does not call for the Server

You have to do that manually

In line 98 basically, after you set the enum value

[split sentinel]

oh. how do i do that?

[thin stratus]

Just call it manually

OnChangeWeapon

Furthermore, why are you spawning the Weapon in the OnRep?

The Weapon itself is replicated or? Then it should also only be spawned on the Server.

If you want to use the OnRep to attach it, make the Gun variable replicated with an OnRep

[split sentinel]

it's cool, because whenever i change the enum to for example "currentGunEnum = EGUNS:Rifle", it automaticly tells the other clients

[thin stratus]

Yeah but that's bascially wrong

YOu should only spawn it on the SErver

[split sentinel]

i'll try to code it and come back to you later

[thin stratus]

// Header
UPROPERTY(ReplicatedUsing=OnRep_Gun)
AGun* Gun;

UFUNCTION()
void OnRep_Gun();

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

    DOREPLIFETIME(ACPlayer, Gun);
}

void ACPlayer::OnRep_Gun()
{
    if (IsValid(Gun))
    {
        if (IsLocallyControlled())
        {
            Gun->AttachToComponent(FPSMesh, FAttachmentTransformRules::KeepRelativeTransform, TEXT("SOCKET_Weapon"));
        }
        else
        {
            Gun->AttachToComponent(GetMesh(), FAttachmentTransformRules::KeepRelativeTransform, TEXT("SOCKET_Weapon"));
        }
        FPSMesh->SetAnimInstanceClass(Gun->AnimClass);
    }
}

void ACPlayer::Equip_Implementation()
{
    if (static_cast<int>(currenGunEnum) + 1 >= GunClass.Num())
        currenGunEnum = EGuns::None;
 
    currenGunEnum = static_cast<EGuns>(static_cast<int>(currenGunEnum) + 1);

    if (IsValid(Gun))
    {
        Gun->Destroy();
        Gun = nullptr;
    }

    Gun = GetWorld()->SpawnActor<AGun>(GunClass[static_cast<int>(currenGunEnum)]);
    Gun->SetOwner(this);
}

Something like this

You can still replicated the enum normally if you need it for UI, but I would probably also handle that all through the Gun that is spawned and replicated

[split sentinel]

The spawning works with your code, but the Gun doesn't get destroyed

[thin stratus]

Then debug it a bit more please. It should hbe fine destorying it on the Server

Given it's marked as Replicated

[split sentinel]

alright

Thank you!

IT WORKS!!!!

[plucky prawn]

so im trying to replicate my spectator pawns but im unable to control my spectator pawn at all. in PIE it spawns 2 pawns and i dont control either of them. it does the same behavior in packaged but i cant see whats being spawned. in the logs on the client i get [2022.03.07-13.54.26:490][151]LogPlayerController: Verbose: NULL GameState when trying to spawn spectator! ... [2022.03.07-13.54.26:492][151]LogPlayerController: Verbose: Spawned spectator SpectatorPawn_2147482378 [server:0] after joining my server, and the server says ```
[2022.03.07-13.54.26:393][431]LogPlayerController: Verbose: Spawned spectator SpectatorPawn_2147482471 [server:1]

here is a link to my `PlayerController::SpawnSpectatorPawn` which removes the `IsLocalController` check to try and get the pawn to spawn on the server too. https://gist.github.com/GamerGambit/c8b97ac851e18cf0f89e6d7216546b00

[thin stratus]

So this seems to solve my issue for now. Velocity variable is an additional impulse. Taking the lastupdate velocity and overriding the mesh velocity solves the "drop dead" behavior on simulproxies

Just in case someone else has issues with this in the future

[thin stratus]

May I ask why you are trying to force this?

Because iirc it's supposed to be local only

[plucky prawn]

fair question. id like spectators to be visible to other spectators

specifically, if a spectator is.. spectating another player instead of free-roaming

[thin stratus]

You don't have to use Epic's Spectator logic

You could basically make your own system

[pallid mesa]

ah this is so your ragdolls are similar on every client end, right?

[thin stratus]

"Similar" yeah, I mean, I don't mind if they are largely different, but the SimulatedProxies just didn't carry the movement speed over into the ragdoll

So when you run and then die, the SimulatedProxies just fell to the floor, without any forward momentum

[pallid mesa]

oh, didn't know that

thought for some reason momentum was preserved

[thin stratus]

It is for the Autonomous one apparently

Not even the Server carries it over properly

Probably some super annyoing line somewhere in the CMC :P

[pallid mesa]

😩 hahaha

[past seal]

has any1 here had problems with "Set view target with blend" in multiplayer. If someone joins the session after i have set view target, the camera offsets a little bit.

[mint nymph]

How would i go by doing that

[peak sentinel]

So looks like desync even happens in ShooterGame implementations. I guess there is no way to prevent it right? Server or owner client can always fire more bullets than each other and no way to prevent this?

If this is the case I'm wondering how competitive games handle this situation?

[waxen pivot]

Hello, I need to replicate the array of vectors TArray<FVector_NetQuantize> but I often get the stack overflow error (or others). How to do it properly? I tried to do serialization but nothing happened, there is very little information about this on the Internet. Thank you in advance.

[mint nymph]

Anyone know how to get player pawns if there are mutliple of them

[pseudo merlin]

hi all, I took an insights profile of 2 locally simulated players in a co-op level, I'm not sure how to interpret the values. I'm assuming I need to optimize my replication but I'm not sure how bad this is or what my goal should be

I'd appreciate any comments on the profile! thanks

[pallid mesa]

this is a wide topic by itself, just be sure you know the features you can visualize with networking insights

such as RPCs, properties and such

once you know what insights can offer is just a matter of empirical observation and analysis

say, you notice you have some properties that replicate very often that add a minimal tail latency that you could simplify

ie velocity, acceleration...

you'd say - hey, this is constantly replicating thus adding n bits constantly to my bandwidth

you could simplify this by applying aggresive optimisation techniques such as converting these values onto simpler data types that can me mapped in the clients to the target values. But this adds obfuscation onto the source code, so apply wisely.

or batching rpc's or applying more aggresive relevancy techniques

But optimisation is an art...

the important thing here is that you understand what every field if insight means

[summer tide]

Let's say you have an actor with a component. When a player overlaps with that actor, you display a widget. Could it be possible without adding anything to the player BP? I only want to use the component.

[rotund onyx]

Can clients set non replicated variables regardless of ownership? If not how can I allow them to do so?

[sinful tree]

Clients can set any variables on their side, but it will only remain on their side. In order for a variable to replicate to all clients, it must be set on the server.

[rotund onyx]

can the same be done for a function?
For instance a non-replicated function that sets a texture based on a non-replicated variable.
That is my setup and I'm trying to figure out why it isnt working

I am trying to set material instance values on client side. In this case I dont want to replicate

[graceful flame]

Say you're making a game like counter-strike with two rounds during a match. Would the gamemode contain logic that handles the round timer or would that be part of gamestate? I'm trying to have a synced round timer show up on the HUD for all connected clients in the session.

[sinful tree]

If you're running on client, then the function executes on the client - anything that it may change would only be on the client.

[sinful tree]

Gamestate

[graceful flame]

thanks

[rotund onyx]

Do I need to set it to run on owning client or is non replicated ok

[sinful tree]

It depends on where you're calling it from.
Eg: Any player input (like keyboard or mouse buttons) are all executing from the client already - you wouldn't need to do an "Executes on Client" event for this.
If there's something being run on the server, and you then want the client to do it, then you'd do an "Executes on Client" event.

[rotund onyx]

Hmm my function should be running then but I don't see any change

[somber glade]

Just to make sure i'm on the right page:

Actor A is in the scene with an oncomponent begin overlap, with a switch has authority->remote because I want to display a visual change to a client.

That remote will actually run on any client that is connected right because they are all remote? so if I only want to display that visual change to the client I should either further filter that pawn by 'is locally controlled' or go to that pawn and run on owning client?

[fathom tinsel]

Instead just check IsLocallyControlled. No need for the switch.

[somber glade]

Good point. And can I make an RPC from there if I need to get some info from the server? or will an RPC only work on the player controller/pawn?

[sinful tree]

If the actor is not owned by the client performing the overlap, then no, you cannot RPC through it - you would either have to use the Authority execution path from HasAuthority which would mean the server can detect the overlap, or yes, RPC through the player controller, pawn or playerstate.

[somber glade]

Yeah the only thing we need the server to do is provide a string from an array it's keep track of. So I'll just go back to the pawn itself and get it there since that is where we're going to use it.

[plush otter]

Usually how do mmo implement pre-computed movement replication? Like during a short period of time the exact delta location of each tick is pre defined?

I tried to force set actor location inside of onMovementUpdate. Works fine on autonomous proxy, but on simulated proxy, as long as the period is finished, it tries to smooth out the location with last sever update info, causing a replay.

[stark tree]

Guys, do I need the Oculus build of Unreal Engine to use Oculus Multiplayer features or is it not essential?

[true grotto]

Hi there! I created a timeline to change the progress bar in the HUD, but the timeline should change on the server, and the HUD only on the client. How can I replicate the timeline for playback position selection? (my method doesn't work)

.h

UFUNCTION(NetMulticast, Reliable)
    void TimerTimeLineFloatReturn(float Value);

UPROPERTY(Replicated)
    UTimelineComponent* BoosterIndicateTimeLine;

FOnTimelineFloat BoosterIndicateInterpFunction{};

UPROPERTY(EditAnywhere, Replicated, Category = "Curve")
    UCurveFloat* BoosterIndicateCurveFloat;

.cpp

AKT_BaseLyingObject::AKT_BaseLyingObject()
{
    BoosterIndicateTimeLine = CreateDefaultSubobject<UTimelineComponent>(TEXT("TimerTimeline"));

    BoosterIndicateInterpFunction.BindUFunction(this, FName("TimerTimeLineFloatReturn"));

    bReplicates = true;
}

void AKT_BaseLyingObject::BeginPlay()
{
    Super::BeginPlay();

    if (IsValid(BoosterIndicateCurveFloat))
    {
        BoosterIndicateTimeLine->AddInterpFloat(BoosterIndicateCurveFloat, BoosterIndicateInterpFunction, FName("Alpha"));
        BoosterIndicateTimeLine->SetLooping(false);
    }
}

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

    DOREPLIFETIME(AKT_BaseLyingObject, TimelineTime);
    DOREPLIFETIME(AKT_BaseLyingObject, BoosterIndicateCurveFloat);
    DOREPLIFETIME(AKT_BaseLyingObject, BoosterIndicateTimeLine);
}

void AKT_BaseLyingObject::TimerTimeLineFloatReturn_Implementation(float Value)
{
    if (!IsValid(PlayerCharacter)) return;

    if (!HasAuthority())
    {
        PlayerCharacter->OnBoosterTimeIsUpdate.Broadcast(BoosterIndicateTimeLine->GetPlaybackPosition());
    }
}

[fathom tinsel]

Set the actual health on server & run the timeline on the client to interp the value to the target.

[true grotto]

but in this way the client can receive inaccurate data

[fathom tinsel]

Play the timeline in OnRep_Health. How can it be inaccurate?

[true grotto]

Hmm, perhaps you are right, but I'm still wondering how I can replicate the timeline, for example, for cases where the function should only be processed on the server. Unfortunately, there is no example in the documentation

[fathom tinsel]

You don't replicate the timeline. You replicate the values that it change.

[true grotto]

I meant values

[fathom tinsel]

Just found out that there is a replicated option in the timeline. That might help.

[true grotto]

Yes I am looking for this in C++

[thin stratus]

I think Timlines had terrible replication features

Whenever I have to deal with this I simply use a Struct with some information and interpolate the value on tick.

[true grotto]

I think tick is not the best way to change something

Better timer

[fathom tinsel]

Not sure how you can exactly set it but it is present on the UTimerTemplate class.

[true grotto]

ok i am trying to use this

Thanks

[fathom tinsel]

If this doesn't work you can just directly set a replicated variable value on server in timeline and that would replicate just fine.

[true grotto]

I did exactly that, I just thought there was a more elegant way

[pallid mesa]

uh.. so you want to smoothly set a value in the server, or you want to smoothly interpolate the value delta in the client?

because if its the later.. don't replicate the timeline, you just don't need that

[upbeat basin]

Is there an event that triggers when PlayerArray or its count is changed? I tried to check array num on GameMode::LogOut event to see if there is no more players to close the game server. But apparently disconnected player is removed from the array after the GameMode::OnLogout call

So what I do right now is is waiting for a frame after OnLogout is called to check if I can close the game server

It doesn't feel right

[winged badger]

there are add/remove player functions in GameState that can be overriden to add it

but note that player array in gamestate is not an ideal way to track num players for the game mode itself

[upbeat basin]

Is there a better way than doing it manually (adding controllers to another array on GameMode and removing upon disconnection)?

[true grotto]

Well, in this case, I can interpolate it on the client, because it's just a HUD element. But I have a function of running along the walls, which is now written not quite correctly and I want to fix it, and all calculations should take place on the server.

[pallid mesa]

Right then since you only want that for visuals then forget about replicating the timeline and fire it locally wherever you find a delta change (onrep)

[winged badger]

you can check during logout if there are any controllers left that are not equal Exiting parameter

[winged badger]

replicating a timeline would be awkward indeed

[pallid mesa]

yes its just - don't x'D

[true grotto]

Ok, thanks for help

[pallid mesa]

btw just in case (probably you know this already). In onreps you can pass in a parameter of type which gives you the old value

with that you have A and B for interpolation

the interpolation method is up to you

[true grotto]

I didn't quite understand about the old value, do you mean that if I replicate the variable, the server might pass a non-actual value to the client?

[pallid mesa]

nono when you implement an onrep for a replicated variable

you can do

OnRep_Blah(mytype oldvalue)

and automatically unreal will provide you the oldvalue that said property had before updating in the client

so you have both your updated value, and the old value provided by the function

it's a pretty nice feature of onreps

[true grotto]

hmm, I thought that he passes the updated value of the variable to this function

[pallid mesa]

no the parameter passes the old value

[true grotto]

no, i messed up everything, maybe you are really right

[pallid mesa]

and then the priperty you have is the updated one

haha

unless i had a very big brainfart, but I'm pretty sure about this

[true grotto]

sorry i was thinking of something else

[split sentinel]

Hello, i have a question. How should i do shooting (with linetrace / raycast) on multiplayer? Should i do it in a Mutlicast RPC? or should i do it with property replication or something like this

[pallid mesa]

you can shoot in the client and send the shooting information to the server to later verify it and do the damage

[split sentinel]

so the linetrace stuff on client?

[waxen pivot]

On both, first check on client then on server

[split sentinel]

alright, but where do i spawn the particle systems? Like muzzle flash and impact effect

[waxen pivot]

on client ofc. You can do multicast event from server after hit

[split sentinel]

oh right, thank you

[left flicker]

I'm working on an app game that involves players playing in an 'event' at the same time, but they aren't all playing on the same level per-se. I mean there is really only the one level in the game, but the players aren't interacting at all with one another.

What I am sort of looking to do is have the server start the game, and then periodically send out one piece of data every few seconds or so to all of the players. The players do their thing, but not sending any information back to the server until they meet a certain condition and then send a piece of data back to the server.

So I'm working through a server tutorial right now that is like a standard ue4 tutorial about a shooter game using replication to determine whether things are shown between players. But is there a better way to go about what I described? Or is basically having it send all that data with every player at the same spot but nothing being replicated to the server, the only way to do this?

[plucky prawn]

i dont really understand your question completely, but it sounds like you want to give each player their own [different] task/goals (which dont require them to interact with each other), then only notifying the server when the player has completed their task/goal?

if so, then yes its 100% possible

i cant help you with any implementation though since im still learning the networking stuff myself

[left flicker]

Thanks for the quick reply anyway lol.
They will all have the same task/goal in the game, but yeah only to notify the server when they have met that goal. But the server will feed all the players more information periodically

If that makes sense

[plucky prawn]

ye makes sense. definitely doable but like i said i unfortunately cannot help with any implementation

[left flicker]

All good. I still appreciate the input

[winged badger]

well, if nothing on the level is replicated, except GameState and PlayerStates, and you do not have a listen server host

it should pretty much work out of the box, with exception of being very susceptible to various cheats

extra work if you're using any AIControllers, as those would have to run locally as well

[tender acorn]

hi all, guys

I wanna ask you, how i have to replicate my widgets? It seems like they don`t have any of replication options

[pure vigil]

What are you trying to do? Widgets don't replicate - they only exist clientside

[waxen pivot]

UI is not repliced because UI exist only in client... because there no need for that, What UI does (should?) it only displays state of gameplay data, that data is only thing that needs to be replicated and UI that display that state will change accordingly without need of replication there. So you should keep data sepretly from UI and replicate only gameplay data, if you make UI display it and edit it, it will just work.

In Slate/UMG you can directly bind widget content to varable somewhere else which can be replicable, so make textbox edit varable that you replicate.

[tender acorn]

okay, i got you bro 🙂

thanks in advance

[eternal canyon]

U can’t

[rotund onyx]

I am still having trouble with getting my variables set client side. Basically I've got a material instance that needs variables set, but I don't want them replicated so the clients each set them when they join a server. For some reason that doesn't seem to be working at all.

[pallid mesa]

Is there any straight away manner to skip the owner replication for a replicated actor?

IsNetRelevantFor will do I guess

[eternal canyon]

There are some more if I remember correctly

Tho I’m not home so can’t rly verify

[pallid mesa]

Had a quick look, couldn't find anything - I'm in a component so the concept of ownership is not so obvious. Although couldn't find anything either for actors xD

[chrome bay]

COND_SkipOwner?

Otherwise it's IsNetRelevantFor

[pallid mesa]

uh, don't think actors have that, although it would be convenient

I'm implementing some sort of projectile prediction

Actually Jambax, I think you smashed your head a bit with that topic, right? 😄

[quasi tide]

All actors have it. It's a part of the replication system.

[pallid mesa]

what's the property name?

[torpid mantle]

hello, is there a step 1 to folder design / project design for multiplayer?

ive been in single player land for a while, so doing a quick check as I setup a new project

[chrome bay]

COND_SkipOwner is a per-property rep condition

[pallid mesa]

yeap

[chrome bay]

If it's the entire actor that shouldn't be relevant then yeah IsNetRelevantFor is the only option

[pallid mesa]

yes that's what I believe I want

but I'm mostly researching different ways I'd have to implement projectile prediction, so maybe this isn't the way

[pure vigil]

I need some help thinking through some logic. Player uses a container (actor), container has an inventory (array of structs). Player gets widget displaying contents. But then the inventory contents change. I could replicateusing/onrep the container actor's inventory.. but where to go from there?

I could have the container actor track all the players that have the inventory open and when the contents changes it could force them all to rebuild their widgets. But for some reason that feels messy to me.

[sinful tree]

I'd make the inventory array an onrep. The onrep should call an event dispatcher. The UI that displays the contents of that inventory binds to that event dispatcher and refreshes the display of the contents when its triggered.

[pure vigil]

Thank you. I think it's finally time I learn how to use event dispatchers

[kindred widget]

Can you tag me and reply when you get this message?

[pure vigil]

👋

[grand mica]

I have a pickup item and when the player overlaps the box component, it displays a HUD for picking up the item.
So in my multiplayer project, I need to replicate the item so once it's picked up. It gets multicasted to different clients as well but i dont want the widget to be displayed on different clients. I am using c++ for it. How am i supposed to hide the widget?

[kindred widget]

You had a delegate. I bound to it, you sent out the message.

[pure vigil]

Hmmmmmm I see.

[grand mica]

this widget is a component in PickupItem

[tender acorn]

guys, could anyone help me with animations? even give a suggestion would be great: how some animations work in multiplayer?

[twin juniper]

Hey I need some help. so i got the community ocean project version 4.25 for the boats(https://github.com/UE4-OceanProject/OceanProject/tree/MASTER_LEGACY_FINAL_4.25). Is there a way to make the harpoon gun replicated for multiplayer? I searched for an answer for so long so any help would be appreciated.

[grand mica]

any idea why user widget is getting replicated on different clients?

[lost inlet]

well a user widget wouldn't be replicated to begin with

[grand mica]

@lost inlet

i can see this on the client

[lost inlet]

?

[grand mica]

i guess this means it is getting replicated?

[lost inlet]

this is not enough context and user widgets are not replicated

[grand mica]

if a player overlaps the item's box comp then a user widget pops up to pick up the item but I can see the pop up on different clients as well

@lost inlet

[lost inlet]

can you not @ me for every message, thanks

and this is nothing to do with replication, you're probably using a widget component on each pawn for some reason

[grand mica]

on each item

not pawn

[lost inlet]

why would you do that either

but oh well

it'll be how the overlap is handled

[grand mica]

I have done UFUNCTION(client, reliable) for overlap

[supple aurora]

Working on my first multiplayer project and doing everything in blueprints. I am building doors that open when interacted with a line trace and close when stepping out of the box collision. I've set it up so the door will rattle when its closed as a player passes by and through the same trigger that closes the door if the door is open. However, the door will only rattle once and then I can't get it to trigger again. Anyone have a possible idea what I might be missing?

[grand mica]

also, when I pick up the items from the client. It disables the visibility but the box component is still active. This doesn't happen in the server side

[twin juniper]

Also how do i make a reel function on this?

[lyric skiff]

Any ideas why this isn't running? the first is a widget button and it calls the function on the pawn associated with the widget

the second function doesn't seem to get called at all

added a print string in the first pic to make sure the button was getting clicked and it is

[fluid iron]

https://media.discordapp.net/attachments/221798862938046464/950839788766896228/unknown.png
create session isnt working
this error msg is from the output log
does anyone know whats the problem?

[pure vigil]

I would start by using "Get Owning Player Pawn" instead of "Get Player Pawn" - I think it will be more reliable. Second .. I could be wrong, but I don't think you can call server functions directly from a widget. I think you may need to call a function on your pawn first then call the RPC from there

[lyric skiff]

I see thank you

[pure vigil]

Having an issue refreshing a player's inventory widget on changes. I have a drag and drop operation implemented. When the player starts to drag a widget, the original item is set to not render with a flag and only the widget representing the drag is shown. When the item is dropped, the flag is cleared then the inventory is updated and refreshed.

The end result is the item shows at its original spot for a small duration before the server updates the data. It looks .. super messy. Was hoping someone might have a cleaner way to handle this

[hollow sky]

hi people, how to i fix that my recoil is playing for all players?

[lost inlet]

and I'll x-post my reply, never use this node in MP

use something else, I'm assuming the weapon has an owner property

[hollow sky]

ye i have a owner pawn refrence

that is a ref to the player bp

[lost inlet]

so why not use that instead

[hollow sky]

gonna try

crashed unreal by remove node line but ye lol

[hollow sky]

still does it for both players

[lost inlet]

then show more of what you're doing

and usually recoil like this is pretty clientside

[hollow sky]

what ya wanna see

[lost inlet]

what's before this big comment block

what's the chain from mouse press to this

[hollow sky]

fire event starts in main player bp, then fires a event in the base weapon to do the recoil and some fx

[lost inlet]

yeah so show that

[hollow sky]

and this is before the block, the other pin form the seq goes to the fx

this is the bath, first one is in player bp, second one in weapon bp

and the shoot func in the weapon bp calls the Shot Fired(EBarrel)

@lost inletany idea?

[lost inlet]

Shoot -> Shot Fired

what happens there

not like I really like network things happening BP at the best of times

[hollow sky]

me neither lol

[hollow sky]

its a function from the Easy Ballisics plugin. It gets the EBarrel (from the plugin) and does the fireing, cant open the function so i dont know whats exactly happening

the plugin is saying its multiplayer setup

when it fires at basicly spawn a projectile at the barrel and does the ballistics things

[lost inlet]

shot fired sounds like it probably arrives on the client as a multicast then

though I would only bother with applying recoil on the client and if it's the owning client of the weapon

[hollow sky]

i see

oh oh i kinda fixed it

ive put the recoil code behind the fire_weapon piece and now its only for the client, but now its only playing once what is logic since its only called when i click

pohhhhhhh

i think i found it

no ok that didnt work

@lost inletso i found this in the barrel settings, if i turn it of it does get called but nothing happens

[fluid iron]

https://media.discordapp.net/attachments/221798862938046464/950839788766896228/unknown.png
create session isnt working
this error msg is from the output log
does anyone know whats the problem?
or atleast know anything i can try

[eternal canyon]

Would recommend looking at https://cedric-neukirchen.net/
this for some of the basics of multiplayer in unreal

[plucky prawn]

is there a function thats called when an actor is replicated? im trying to check when AGameState is replicated to the client

[torpid mantle]

anyone here use steamwerks sdk?

[plucky prawn]

ask your question

[torpid mantle]

Thats fair. I'm starting a multi player game, pretty decent with single player and the game will be on steam at some point. Does it make sense or hurt to go ahead and use the sdk now for foundation of auth, lobbies, etc.. or is there a basic way of doing it to 'fake' things during development until I need to bring it in. (i.e.) how hard to add later on. My first mp game so I'm trying to think about how to start. Game is 2d async strategy. So I need a server.. but clients aren't really connected in real time.

there might be like 2 solid q's in that puking of words

[plucky prawn]

really depends on what platforms you want to support. if you are 100% sure you are only going to use steam then it doesnt really make sense to worry about other platforms so id suggest to just lock in steamworks. however, if you plan on supporting other platforms like EOS or whatever, there exists in unreal OnlineSubsystems (like steam and EOS) which abstract functionality into a nicer API which will allow you to basically swap these subsystems in and out. of course, these abstractions will not contain all features from every sdk/subsystem (as an extreme example, steamworks allows you to join steam groups and message other steam users, the generic abstracted OSS API will probably not support this since other OSS's probably dont have steam integration)

[torpid mantle]

Could you build to the OnlineSubsystem api to get the game up and working then add steam later?

[plucky prawn]

yep. thats literally the point

[torpid mantle]

In order to distribute through steam you need the steamwerks stuff?

big q as my single player game will go there as well

[plucky prawn]

afaik you dont actually need steamworks to distribute your game on steam (see factorio in the very early days). you only need steamworks if you want steam integration. with steamworks you can make sure that there is a logged in steam user running your game, and that they actually own your game on steam (eg to prevent piracy)

[torpid mantle]

ah k that makes sense

any clue the $$ per app?

i guess i'll go find that out

where are the EOS Online subsystem docs?

hahah probably in the #online-subsystems channel

..

[plucky prawn]

are you asking how much it costs to put your game on steam?

[torpid mantle]

just reading this stuff

https://partner.steamgames.com/doc/gettingstarted/appfee

that doesn't really.. say

[plucky prawn]

the last sentence isnt entire true. you can use steamworks with the 480 (Space War) steam app id and it will work fine, but for multiplayer sessions it will pick up literally every server running this app id

afaik the fee is negotiated between you and valve

[torpid mantle]

ohrly

[sinful tree]

Whether you are completing the Steam Direct signup process or are already an established Steamworks developer, you can now simply pay a $100 USD (or equivalent) fee for each new app you wish to distribute on Steam.

[plucky prawn]

someone who has actually released a game on steam might have more details about this

ah ez

looks like they didnt change it from greenlight

[torpid mantle]

ha top line

thx

k let me see about those subsystems first

this other stuff seems like a lot my lawyer will want a peek at

[fluid summit]

Hi everybody! i'm having a trouble with something and i was hoping someone could give me some pointers on where to search for a solution.

Currently i'm gathering some data on the server with Json calls, this is triggered and handled with events (exclusibly)

The problems is that the events don't wait until the previous one is finished, and since i require some Api calls to be finished before execution the next one, it's generating a mess with the load of the overall data.

I was thinking on the following solutions:

1. Create some variable bool Replicated and change the state of it after LoadPart1 is finished, and trigger LoadPart2 on the OnRep of that variable.
2. Using Tasks, but i'm not sure if this is ideal on MP, i'm open to suggestions.

The problem with the first one is that i need as many variables as steps on the process, sounds stupid.

Thanks in advance

[lost inlet]

there's an additional detail that if you're a trusted steamworks partner, you accumulate free app credits as well

so you don't have to pay the $100 per title every time unless you're just constantly uploading shovelware

[plucky prawn]

Ah very nice. I'm keen to get my "game" on steam but I'm worried that since it's still basically just an idea/concept it will be rejected

[plucky prawn]

Is there a way to do per-connection replication? I've seen IsNetRelevantFor, is this the correct way?

[marble gazelle]

Who sends these events? are the events in the correct order? If so: Create a queue and process them one after another as I assume you do some rest calls these give you a "done" callback and if one request was done you can continue with the rest.
Not sure if this is the case, but if your requests have some specific requests to send, maybe put all this logic in one request, so you can execute any request at any tíme and the backend ensures everything is executed correctly and if needed calls some other stuff.
But maybe I don't get your architecture right^^

[kindred widget]

That is one way to do it. Useful if you need only a select few people to know about an object. Like a "TeamState" maybe. Realistically if you're only trying to talk to one client, it can be easier to drop an actor component on the controllers to route data through. Both work. Technically using an actor is cheaper net wise I think but requires a little additional setup. Depends on your use case or preference.

[grand mica]

Hello guys, I really need some input from the experts over here. I am pretty new with both Unreal and networking and there are a few missing links in my understanding.

Here are my multiplayer setting. I assume with this setting there won't be a player playing as server. So most of the events that happen, I need to pass them from client to the other client. I read somewhere that you first need to send things to the server first and then to the other clients. I am doing things with c++. So i have tried a few things which causes error. For eg.

To pickup an item I am first made a function binded to an action key

here it is

UFUNCTION(NetMulticast, reliable)
    void InteractWithItem();

void Aaissgnment51FarmCharacter::InteractWithItem_Implementation()
{
    if (currentIteminRange)
    {
        currentIteminRange->PerformActionInitial();
        if (!currentIteminRange->isDamageable)
        {
            if (currentOwnedItem != nullptr)
            {
                currentOwnedItem->positionWhenDropped = GetActorLocation();
                currentOwnedItem->PerformActionInitial();
            }
            currentOwnedItem = currentIteminRange;
            auto temp = InventoryHUD->GetUserWidgetObject();
            UinGameInventory* infoWid = Cast<UinGameInventory>(temp);
            infoWid->SetCurrentItemInInventoryInformation(currentOwnedItem->itemType);
            currentIteminRange = nullptr;
        }
    }


}```

void APickableItem::PerformActionInitial()
{
    if (HasAuthority())
    {
        PerformAction();
    }

    else
    {
        switch (currentState)
        {
        case ItemState::LAYINGONGROUND:
            if (isDamageable)
            {

                FVector explosionLoc = GetActorLocation();
                UNiagaraFunctionLibrary::SpawnSystemAtLocation(GetWorld(), DamageEffect, explosionLoc);
                currentState = ItemState::BROKEN;
                SetLifeSpan(1.0);
            }
            else
            {
                currentState = ItemState::PICKEDUP;
                PickUpMeshComp->SetVisibility(false);
                SetActorEnableCollision(false);
            }
            break;

        case ItemState::PICKEDUP:
        {
            currentState = ItemState::LAYINGONGROUND;
            PickUpMeshComp->SetVisibility(true);
            SetActorLocation(positionWhenDropped);
        }

        default:
            break;
        }
    }
}```

I can pick up the item through the client but the box collider doesn't get disabled for the pickup item

and the widget attached to the item gets displayed to all the clients

[grand mica]

also, the multicast function is being called only once 😦

[thin stratus]

Multicast is Server Only

So you need an Server RPC first

Also a lot of this stuff doesn't need a Multicast

The Server should be fine handling 90% of this on their own

The only thing you need to tell the clients is if the picking up actually worked

And that depends on how you manage picking up stuff.

Or rather, what it means to pick things up

E.g. destroying the Pickup when it's picked up

And then there is 2 things that can happen:

1. One Time Actions
2. State Changes

One Time Actions would be playing a Pickup Animation, spawning a Particle, etc., which can be done via a Multicast. E.g. on the Pickup itself.

State Changes, if you don't destroy the Pickup, need to be handled via RepNotify variables, because hot joining players or players that are out of relevancy range, won't get the Multicast and will not see the changed State.
An example for a State Change is visibility or collision.

@grand mica

[winged badger]

@grand mica you have a few structural problems there that will bite you in the arse later on

[grand mica]

Thanks for the help. I'll try it right away.
Also, there isn't a player which is the server. So how can I do things from the server

[winged badger]

never manipulate UI directly from game code, UI gets changed 10 times during development of the game, you don't want to have to change the game code every time that happens

[thin stratus]

For Multiplayer you need a Server. either ListenServer, so a Client is a Server, or a DedicatedServer, where the Server is not a Client iself.

[winged badger]

also, for things like interaction, its better to make a more generic interface, so that you can pick up an item, fire a cannon or open a door with same set of RPCs

[thin stratus]

So either way you have a Server

[grand mica]

by dedicated server you mean doing all those lengthy setup to make a server without a player?

[grand mica]

yes that's an inventory state update

you are right

[winged badger]

game code just needs to instantiate a widget and push it a reference to the object its displaying

[grand mica]

it gets altered many time during development stage. Actually it's an asssignment stuck up on my ass. So I thought of doing something simle

[winged badger]

UI can manage itself from that point, c++ just needs to fire an occasional MC delegate to notify it to update

[grand mica]

you are right. But sometimes I am just not very comfortable with c++ in unreal. It has many macros I need to take care of. I am missing native c++ 😭

[winged badger]

one thing i really don't miss is std 😄

[grand mica]

@thin stratus btw by dedicated server you meant this?https://docs.unrealengine.com/4.27/en-US/InteractiveExperiences/Networking/HowTo/DedicatedServers/

cos according to the assignment the dedicated server is easy to set up lol

[winged badger]

that kinda depends on your hardware spec

[grand mica]

ah you can use boost instead 😛

[grand mica]

wdym by that?

[winged badger]

you need to download and compile the source engine

while a newer high end CPU can do that in 20 or so minutes

you really don't want to be doing it on i3 mobile

[grand mica]

according to this, I should have got the option for dedicated server in the drop down menu

[grand mica]

ah i have 5600x

[winged badger]

not with binary launcher

[grand mica]

so i have to link up the source code now

[winged badger]

you literally have to download the UE source from epic github

[rigid flare]

u gotta have it running I think

[winged badger]

then build that

[rigid flare]

so that's a bad way to get multiplayer working

[winged badger]

https://gyazo.com/745554c8aa5b19663d56dd1bac38a996

then you get this

[rigid flare]

correct me if I'm wrong tho

[winged badger]

also, after you download UE source

[grand mica]

I had reached till this point until a few members of this group told me they dont mean this dedicated server

[winged badger]

build UE and not the entire solution

[grand mica]

this one is tougher to build and setup

[winged badger]

you'll need about 150GB

[grand mica]

they told me a few things have changed from the menu. The assignment is wrt to 4.23.1 version. I think they had different names at that time

[grand mica]

it brings the difference in levels tbh 😛

[grand mica]

what did you mean by it?

[thin stratus]

This is to test in the Editor

This is not for actually distributing the game

You can test Dedicated Servers in the Editor with Play As Client in the Dropdown

Or on Older UE Versions it was something something Dedicated Server

But if you actually want to build a standalone DedicatedServer, you need to download the Source code of UE, compile it and then you get the option to actually build a standalone Dedicated Server

[grand mica]

i think this is what they meant.

[thin stratus]

Which you then have to host somewhere so that others can reach it (aka cloud servers that cost money)

Or you provide the players with the DedicatedServers if cheating is not a topic for you

[grand mica]

ah, not this I am pretty sure of.
So the tips you shared above for the game. I hope they will work on this "play as client"

[thin stratus]

Yeah the point is, the Editor stuff is only for testing

You won't get around the source code part

Eventually you need to actually build and ship a the DedicatedServer

Which is not possible with UE downloaded from the Launcher (Or Epic Games Store or whatever they call it by now)

[grand mica]

I have downloaded the source code as well but I doubt the requirements. They just want me to test it on editor

[thin stratus]

Right, if you just need to do something for some test, then it's probably not needed to do the Source Code part

I don't know why you are doing what you are doing, so I expect this to be a project that is supposed to be released in the future

[winged badger]

and it came with some awkward keyboard shortcut so you could toggle dedicated server on or off without noticing 😄

[grand mica]

ah no, job test assignment

they know I dont have any professional experience with unreal.So, I really doubt setting up dedicated servers is a requirement

[thin stratus]

o.o luckily never had that

[winged badger]

it only worked when play option dropdown was expanded

it caused a few wtf moments

[grand mica]

@thin stratus just a small doubt. If I am playing with one of the clients and I call a function which is tagged as UFUNCTION(server, reliable), it never goes inside that function. How can i even multicast if it never enters the server RPCs?

[thin stratus]

You can only perform ServerRPCs in Actors that are owned by the Client executing it

E.g. PlayerCharacter (Possessed), PlayerController, PlayerState, Components that are replicated on those Actors, or other Actors that the Server spawned and have the Owner property set when spawning to something that is already owned by that player

Otherwise it will drop the call

So an Item in your level can't have a ServerRPC

Or at least it won't work

[grand mica]

@thin stratus so if I set the owner before calling this function in PickUp, I guess it should work?

[thin stratus]

Has to be set on Server side

[grand mica]

yeah, through the character

[thin stratus]

Yeah, but at that point you are already on the SErver

Which makes it redudant to change the owner on the pickup

Cause then you don't need the RPC anymore to begin with

For Interactions Systems you usually RPC in the Character or whatever components on the Character handles this

+- some differences that others might now point out, but Character is a good start for an interaction system

So the Key Press for Interaction would already peform the ServerRPC

And the Server would then handle the Interaction

[grand mica]

I see, thanks for it. I'll try a few things out and see how things need to work. Thanks for the help

[sinful tree]

Your interaction needs to be replicated before passing to the trap. So right after your linetrace, you can check if the actor implements the ObjectInteraction interface, and if it does, RPC to the server there. Once running on server you can pass the actor reference to the interface. You may want to check on the server if the player is actually close enough to perform the interaction as well prior to disarming the trap.

Also, you do not need the Get All Actors of Class or the second interface call - your logic that is in the TrapDisarm interface should be what is contained on the ObjectInteraction interface call.

[ruby tundra]

Hi everyone hope every one is good. Well I have a question I have a multiplayer Hud which displays the health of both players. But I cannot find a way to display real time health of both the player. I would appreciate any help.

[clear turret]

Thanks for your reply. To RPC I should create a custom event that runs on server, right?

Not sure if I understand this second part completely, could you share more details, please? Should I keep it all in the same interface function?

[clear turret]

I'm just re-sending the message, as I've deleted by mistaken 😅

Hello everyone! I'm stuck with something with Replication and seeking for some help - most likely newbie's mistake 😅

I have a game trap (BP_Trap) in the world, and it can be disabled by a lever (BP_Lever). The lever is activated via Interface from a Linetrace that comes from PlayerController - and it requests the trap disarm through interface as well.

My problem is, if it's the client that disables the trap, the variable is not modified on the server. How can I fix this? I've tried changing image 3 to CustomEvent RunOnServer, but then the client can't disarm the trap.

I'm uploading these images:
(1) LineTrace on BP_PlayerController
(2) BP_Lever casting Traps to disarm
(3) BP_Trap checking and disarming itself

[sinful tree]

Yes, RPC to Server = Run On Server event.
Your interface itself would be running on the actor needed already (or at least, I would hope so) so there's no real point in getting all actors of class and running the interface on all of them.

So if the actor you're interacting with is a BP_Trap, then it would disarm it.

[clear turret]

Thanks, @sinful tree! 🙇‍♂️ Following your tip I was able to do that first interaction. 🙌

[clear turret]

That's the thing I'm getting it. The player interacts with another actor (BP_TrapDisarm), and then this actor requests the BP_Trap to disarm based on its ID

[sinful tree]

Ah ok, that is a bit different then. I suppose you could still work with what you have for the interface then.

[clear turret]

Yeah, I'd love to find another alternative for that cast, but couldn't think of a way 😅 And since this is the prototype, it will work for now.

If you have other suggestions, please point the way so I can research for the future 🙏

Right now, what I was thinking was to use Tag instead of a variable, so I'd "Get All Actors with Tag", which I think could reduce the amount of actors request

[fluid iron]

https://media.discordapp.net/attachments/221798862938046464/950839788766896228/unknown.png
create session isnt working
this error msg is from the output log
does anyone know whats the problem?
or atleast know anything i can try

[fluid summit]

Going to check on quehes, thanks!
The events are handled on the player controller as regular events, and they do have a "response" to signal they are done.

[livid holly]

if I'm replicating a UStruct and I change only one property in the server, does the entire struct replicates? Or only the changed property?

[peak sentinel]

Changed property

[grand mica]

Hello, So the pick up of item worked well on all clients. I made a server call on the character and through that call I called a multicast function on the item.
Right, there's only one issue which is left. It's the user widget. I read user widget don't replicate at all but there are two things which are happening atm.

1. the inventory widget which I have added to the view don't update the item's text into it.
2. when the overlap event triggers, the items switches on a hud. For eg. "Press F to pick up Statue" but this gets replicated on all the clients. I don't even know why. I have made these calls as client only but it still happens. Here is my code:-

    UFUNCTION(client, reliable)
    void InteractAtm();

void Aaissgnment51FarmCharacter::InteractAtm_Implementation()
{
    
        if (currentIteminRange)
        {
            InteractWithItem(this);
        }
    
}```

    UFUNCTION(server, reliable)
    void InteractWithItem(Aaissgnment51FarmCharacter* pawn);```

void Aaissgnment51FarmCharacter::InteractWithItem_Implementation(Aaissgnment51FarmCharacter* pawn)
{
    if (pawn->currentIteminRange)
    {
        pawn->currentIteminRange->PerformAction();
        if (!pawn->currentIteminRange->isDamageable)
        {
            if (pawn->currentOwnedItem != nullptr)
            {
                pawn->currentOwnedItem->positionWhenDropped = GetActorLocation();
                pawn->currentOwnedItem->PerformAction();
            }
            pawn->currentOwnedItem = currentIteminRange;
            ChangeInventoryText(this);
        }
    }
}```

    UFUNCTION(NetMulticast,Reliable)
    void ChangeInventoryText(Aaissgnment51FarmCharacter* pawn);

void Aaissgnment51FarmCharacter::ChangeInventoryText_Implementation(Aaissgnment51FarmCharacter* pawn)
{
    if (currentOwnedItem!= nullptr)
    {
        auto temp = InventoryHUD->GetUserWidgetObject();
        UinGameInventory* infoWid = Cast<UinGameInventory>(temp);
        infoWid->SetCurrentItemInInventoryInformation(currentOwnedItem->itemType);
    }
}```

UFUNCTION()
    void OnOverlapWithItems(class UPrimitiveComponent* OverlappedComp, class AActor* OtherActor, class UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult);
    UFUNCTION()
    void OnOverlapEndWithItems(class UPrimitiveComponent* OverlappedComp, class AActor* OtherActor, class UPrimitiveComponent* OtherComp, int32 OtherBodyIndex);

void Aaissgnment51FarmCharacter::OnOverlapWithItems(UPrimitiveComponent* OverlappedComp, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult)
{
    auto InteractableItem = Cast<APickableItem>(OtherActor);
    if (InteractableItem != nullptr)
    {
        currentIteminRange = InteractableItem;
        InteractableItem->ShowHUD(true);
    }
}

void Aaissgnment51FarmCharacter::OnOverlapEndWithItems(UPrimitiveComponent* OverlappedComp, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex)
{
    if (currentIteminRange != nullptr)
    {
        currentIteminRange->ShowHUD(false);
    }
}```

sorry for bothering you guys

[sinful tree]

For #2: Not 100% sure, but if OnOverlapWithItems is being detected when a player's character is overlapping with an item, then all clients could also see that overlap happening, which means "InteractableItem->ShowHUD(true)" would trigger on all clients. This could potentially be fixed by adding a "if (IsLocallyControlled())". You'd probably want a similar check on the OnOverlapEndWithItems check too, otherwise the UI element may disappear when you don't want it to when another player leaves.

[grand mica]

thank you so much. It's fixed. Now just one of them remains 😛

any idea why my widget isn't getting updated?

[sinful tree]

My guess would be that currentOwnedItem isn't replicated. Updating the inventory display shouldn't even need to be handled as an RPC, let alone a multicast. If currentOwnedItem was set up as an OnRep variable, then with the OnRep function you could again do a IsLocallyControlled check, and update the inventory from there.

[grand mica]

why does it need to be replicated. It's a class member, it should be a separate variable for each client

[sinful tree]

If you're setting a variable on the server, and you intend for the client to use that variable in some way (including for displaying information) then it needs to be replicated.

[grand mica]

is there a way to set a variable on the client itself?

[sinful tree]

By setting the variable while running on the client.

But by doing so, no one else knows thats what the client has.

[fluid summit]

if you want to trigger the OnRep, you can do struct = struct.

[grand mica]

so they can't even render it the item is visible in their hands?

[fluid summit]

Is there another term for "quehe"? cause i can't find anything about them

[sinful tree]

Each copy of the character will have its own value set. Replicating is meant in terms of copying the value that the server has of this specific instance of the object and letting clients know that the value for that particular instance of the object has that value.

So you have a character, I have a character. We both have our own currentOwnedItem variable.
You (through a server RPC) let the server know that you want to pick up the stone sitting on the ground. It sets your currentOwnedItem to stone. If it was marked to replicate, then your client would then know that your currentOwnedItem is stone, and my client would know that your currentOwnedItem is stone.
I still haven't picked up anything on my character, so my currentOwnedItem is still nullptr.

[sinful tree]

queue.

[grand mica]

gotchyaa. I should first replicate these variables now.

[sinful tree]

In a very basic sense, your queue could just be an array of "requests" that you want to make.
When you want to make a request, you add it to the array, and check if a "request processing" boolean is true.
--> If so, don't do anything further for now
--> If not, set your "request processing" boolean to true, get the request data at array 0 and submit the request with that data.
When you receive the response back, remove the item at index 0 of that array.
Check the size of the array is > 0.
--> If so, make an event that triggers the same "get the request at array 0 and submit the request", basically looping it.
--> If not, set your "request processing" boolean to false and no further action required.

[fluid summit]

i was thinking in something like this, but i tought maybe there was already a function in UE4 for things like this.
Thanks!

That one did the trick and it was really simple, thanks!

[pure vigil]

Having a listenserver issue. In my playerstate, I have an RPC to update a variable. This variable is set to replicate with ReplicateUsing= (repnotify). Works fine for clients but this function doesn't get called serverside when the listen server is running it.

I could manually call the replicateusing function which DOES cause it to execute on the server .. but it also executes TWICE on the clients now.

Any good way around this?

[kindred widget]

You should have an updating function or binding to call. Call that from the OnRep, and call it after setting the new variable. Clients run it from the OnRep, server runs it right after variable set.

[pure vigil]

The problem is determining if this is the server updating a value for itself or the server updating the value for a client

[kindred widget]

How so? The OnRep is for the client. The Set function is for the server.

[pure vigil]

Ohhhh ok, I think I see. Let me give that a shot.

[kindred widget]

Basically you should have....

void SetSomeProperty(ValueType NewValue)
{
  SomeProperty = NewValue;
  DoUpdateStuff();
}

void OnRep_SomeProperty()
{
  DoUpdateStuff();
}

void DoUpdateStuff()
{
  //Called from OnRep on client.
  //Called directly after variable set on server.
}

[pure vigil]

Gotcha. Turns out I was doing something like that already .. but with an extra step that called a Client function which then called DoUpdateStuff. So even when I called it directly on the server, it then ran it on the client again. It needs some cleanup.

[neon ether]

So im spawning a vfx on a server and client through a multicast rpc thats being called from the locally controlled player. The spawning of everything works just fine. But how would I go about being able to deactivate that same vfx so that it deactivates on the server and client?

[kindred widget]

That sounds very state based, good case for a simple replicated boolean or something.

Alternatively, could change the multicast to have a boolean.

Depends on the case and how long this vfx is. If it should turn itself off don't worry about turning it off. If it lasts for a few seconds, maybe change the multicast parameters to be able to call it with a "Turn on/TurnOff" state. Else I'd probably do a replicated property to keep track of it if it lasts for some time. Newly joined, or newly relevant clients can be updated this way.

[neon ether]

So the vfx is a flamethrower and it just needs to be turned off when the player lets go of the fire button. Which all that architecture is in place for that to be able to happen I just need to vfx to turn off for the server and client. The vfx component that gets spawned in is itself replicated. The basic flow is Weapon Actor Wants to fire -> vfx gets spawned on server and client through a multicast called from a server rpc -> that multicast spawns and sets the replicated vfx variable which should get replicated down to the local/client machine (which it seems to not do). Then for turning it off there is a multicast function that uses that same vfx component spawned and set from the previous multicast and dactivating that. The issue seems to be that when that multicast runs on the client it has no reference to that vfx component spawned originally

[kindred widget]

Not sure I'd even despawn it personally. I'd just make it a part of the weapon. Enable it or disable it based on the fire state. Reliable RPC the firestate from the owning client to the server. You can possibly let firestate be set on the owning client locally along with the RPC to server and firestate can replicate to non owning clients and enable disable the effect on any non owning machine that way.

[neon ether]

That previous message probably didnt make much sense, so I'll try and do a better job of explaining with pictures and whatnot. The first image shows the replicated vfx that I mentioned. The second is how the multicast gets started when the player fires. The third image shows the actual multicast function that ends up getting called where the vfx gets spawned and that replicated variable gets set. I think my issue here is that this will only ever let me have reference to one of the vfx that end up getting spawned and not the client and servers.

So okay i think i see what your saying conceptually. But I also dont think i see how you do that. Since from what I understand to be done correctly a vfx needs to spawned in a multicast to show up on the client and server.

[kindred widget]

This is a specific implementation. I'd probably run this through some base classes. But the basic straight forward idea is this.

.h
UPROPERTY(BlueprintReadOnly, VisibleAnywhere)
UNiagaraComponent* FlameThrowerEffect = nullptr;

UPROPERTY(BlueprintReadOnly, ReplicatedUsing=OnRep_FireState)
bool FireState = true;

UFUNCTION()
void OnRep_FireState();
void UpdateFiringState();
    
virtual void GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const override;
    
UFUNCTION(Server, Reliable)
void ServerSetFireState(bool NewFireState);

void StartFiring();
void StopFiring();


.cpp
void AMechBase::OnRep_FireState()
{
    UpdateFiringState();
}

void AMechBase::UpdateFiringState()
{
    if (FireState)
    {
        FlameThrowerEffect->Activate();
    }
    else
    {
        FlameThrowerEffect->Deactivate();
    }
}

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

    DOREPLIFETIME_CONDITION(AMechBase, FireState, COND_SkipOwner);
}

void AMechBase::ServerSetFireState_Implementation(bool NewFireState)
{
    FireState = NewFireState;
    
    if (GetNetMode() != NM_DedicatedServer)
    {
        UpdateFiringState();
    }
}

void AMechBase::StartFiring()
{
    //Call this on owning client to start shooting
    ServerSetFireState(true);
    FireState = true;
    UpdateFiringState();
}

void AMechBase::StopFiring()
{
    //Call this on owning client to stop shooting
    ServerSetFireState(false);
    FireState = false;
    UpdateFiringState();
}

[neon ether]

To sum up; when I do the spawning of the vfx this way and I go to deactivate the vfx through a multicast like shown in the image then it only turns off the vfx on the server side and doesnt ever on the client because the client only ever has a NULL reference for its "ProjectileVfxNiagaraComponent"

oh wow okay I'll definitelly pick apart that file and see whats different than what im doing

[kindred widget]

Have a property. Let it replicate to anyone but the owning player. Use that to enable to disable a default system on the weapon. Set this locally on the owning client when telling server to change. Tell server to set it and also to update it's state. Everyone gets updated, it's stateful for newly relevant clients. And it should feel reactive for the owning player.

Mostly sure I got all of that correct. Not in a networked project at the moment. 😄

[neon ether]

So in this case is the FlameThrowerEffect being initialized in the constructor..?

[kindred widget]

Yeah, Default component on the flamethrower. You can set the particle emitter it uses from BP.

No point continually destroying and respawning an emitter that is consistently reused.

[neon ether]

So youd be setting that component in the constructor with the usual spawnDefaultSubObject method to give it that component?

[kindred widget]

Yeah

[neon ether]

and then set the emitter in that created blueprint in there.

okay that makes more sense now

[kindred widget]

Like I said, I'd probably do half of this in a base weapon class like the start and stop firing, and the firestate, etc. mark them virtual. Might not even make a flamethrower C++ base since the UpdateFiringState can just be a BluepintImplementableEvent to start and stop the emitter.

Depends what else you need I guess.

[neon ether]

Yeah it definitely does, I appreciate all the input though, I'll adjust our imlemimentation of how the "on/off" logic to match your example since it makes much more sense to do it that way since even spawning it over and over doesnt make much sense to begin with

[neon ether]

Are you not able to deactivate the component in the constructor right after creating it?

[kindred widget]

Your component doesn't actually exist at that time. That call is more of a registration to create a component.

It does, but doesn't, so to speak.

If you want to disable it early, consider PostComponentInit or OnConstruction

[neon ether]

Thank you! I wasnt actually aware of PostComponentInit

[neon ether]

just to clarify one last piece c++ if (GetNetMode() != NM_DedicatedServer) { UpdateFiringState(); } This chunk here is meant to update the firing state on the server side if we arent a dedicated server correct? Aka this is what will be responsible for turning the vfx off on the server?

[kindred widget]

On/Off, yeah. Cause server won't fire the OnRep

[charred crane]

In my game mode OnPostLogin, I'm spawning a player and possessing it. Then I'm getting all my Player Controllers and telling each of them to update their hud with the new pawn that I spawned via client RPC. Clients are getting an invalid object. Do I need to have the game mode get the PlayerStates and tell them to update? How do I get the new pawn ref to them?

[dark edge]

RepNotify my man

[charred crane]

Wait I'm actually a mental brick

[timid moss]

Feel really stupid for asking this, but why is it that we don't use a ROLE_Authority guard when we call CreateDefaultSubobject in the constructor.

People always teach that you always only spawn stuff on the server and have it replicate down (unless prediction), so why is is different in this case?

[charred crane]

In my Event OnPossess inside my PlayerController, I have a value that is RepNotify. On the RepNotify I'm getting my GameState, but it's invalid. How could a client's GameState be invalid?

[sharp kestrel]

I'm looking at the Network Compendium now and it seems to me like the GameState is owned by the server, all the clients can see it but don't have ownership.

I'm not sure if this helps at all but my guess here is that the GameState is invalid because the local PlayerController doesn't actually have one to speak of.

Does the Host player also return invalid?

[charred crane]

GameState is how a client interacts with a game mode. Any info that needs to be accessible to clients about the overarching rules are supposed to be here. If I throw in a delay, it works. But the game state should exist/replicate before a random value I set inside the onpossess of my player controller replicates.

[sharp kestrel]

Right. Wasn't sure if you were just accessing it in a weird way or something.

If a delay makes it work then my best guess here is that you have some order-of-operation issues.

Like trying to access it before it is actually created, which would naturally make it invalid.

[charred crane]

How can a PC exist and replicate to a client before the game state does though?

[sharp kestrel]

Though I'm pretty sure stuff relating to players should be made afterwards anyways.

I mean that's what I thought but if a delay makes it work?

Although

From what I was asking in #blueprint it does seem like the host player is made before any OnBeginPlay triggers in gamemode/gamestate stuff.

So... depends largely on what you're doing.

[sinful tree]

I believe it's because the player controller needs to exist before the client "joins" the game. Once it joins, then the gamestate can replicate to the client.

I could be wrong tho 😛

[charred crane]

I'm testing with a client joining through steam. so the host player already exists, the controller has to exist for it to possess something.

My logic to get game state is triggered on that repnotify

[sharp kestrel]

I think Datura might have the answer there. Host' controller is constructed resulting in its pawn being constructed and possessed which would trigger the OnPossess event before the GameState is constructed?

[charred crane]

So we've already possessed a pawn. and our game state still isn't valid yet?

[sharp kestrel]

Possibly.

I'm going to test something real quick

[charred crane]

This feels stupid, but maybe I should just make a rep notify bool or something inside gamestate and on that notify then do my game state check/logic that i want to do.

[sharp kestrel]

Okay test failed, I can't print from a construct. I wanted to see what triggered first, a host OnPostLogin or the GameMode constructor. I know the OnBeginPlay starts after PostLogin

Oh wait

Are you working with GameMode or GameState here?

[sinful tree]

"Play as Client"
Player controller exists before Gamestate.

LogBlueprintUserMessages: [BP_MyPlayerController_C_0] Client 1: Client Playercontroller
LogBlueprintUserMessages: [BP_Gamestate_C_0] Client 1: Client Gamestate

"Listen Server"
Gamestate exists before Playercontroller

LogBlueprintUserMessages: [BP_Gamestate_C_0] Server: Authority Gamestate
LogBlueprintUserMessages: [BP_MyPlayerController_C_0] Server: Authority Playercontroller

[charred crane]

GameState, because GameMode isn't valid to clients

[sharp kestrel]

Host PostLogin
GameState OnBegin
Other players PostLogin

[charred crane]

That GameState is for the host though right? Don't they have both?

I'm running a listen server with a host player and joining that server through player input. That should mean gamestate exists before right @sinful tree ?

[sharp kestrel]

I'd go with what Datura is suggesting honestly. You might want to test this with an actual build as sometimes the engine can be a bit funky with this stuff.

[charred crane]

I'm testing with packaged game

[sharp kestrel]

Aah okay

[sinful tree]

The gamestate may exist on the server, but it has to replicate to any clients when they join.

And player controller exists before gamestate on clients.

[charred crane]

Are there like...async tasks that can loop until my gamestate is valid? or do i need to write that myself?

or a not crappy way to wait until my game state's valid

[sinful tree]

So here's the thing that I'm not entirely sure about....
When you normally possess a pawn, the player controller already knows the pawn they are possessing. This can be accessed easily at any time by doing GetControlledPawn. It may not be the type, but it's not something that you would need to replicate from the server.

[sharp kestrel]

Out of curiosity

[sinful tree]

So that OnRep of the pawn isn't really necessary as the playercontroller will already have easy access to the object it is possessing.
What is it in the gamestate that you're trying to do when the client joins?

[sharp kestrel]

Would the Delayed Start thing help here?

I don't know if Delayed Start prevents players from possessing their pawns

But it might be worth giving that a shot?

[charred crane]

Yeah the OnRep of the pawn was just a trigger to let me know that the client side possession has finished and that I can attempt my game state stuff

since we've established that the gamestate won't be valid yet, i reverted it

[sinful tree]

Ok, so the thing is, you shouldn't have to care about the client receiving the replication for things to proceed really. Your gamestate should do as it needs on the server without input from the client.

Unless of course, you're wanting client input for something 😛

[charred crane]

What I'm trying to do is get the player pawns of each other character in the game. To do that I need to get the game state and get everyones controllers(through player states) and then their pawns. Which requires the gamestate to be valid.

[sinful tree]

To do that I need to get the game state and get everyones controllers and then their pawns.
This would not be possible on clients as player controller only exists on owning client and the server. So this sounds like it would be a server-side operation, no?

[charred crane]

I edited my comment, I'm getting everyones player state, then their pawns through that.

[sinful tree]

You still say controllers though

[charred crane]

I'm not getting controllers

[sharp kestrel]

Okay so to repeat my question since it was ignored in Blueprints.
Is there a way to delay a host player's OnPostLogin to only fire after GameState has done its OnBeginPlay stuff?

Each player (human or AI) has a faction associated with it and I want all the AI ones (determined by the map selected) to be loaded into the list before players.

Human players are added on PostLogin which means host always goes to top of the list 😦

[charred crane]

Is reordering the list a possibility? Or is there some other functionality that is required?

[sharp kestrel]

I could maybe do a reorder. Its a list of structs so I can just add in a "is human player" boolean I guess

[charred crane]

Set Array Elem should work pretty well for it

[sinful tree]

Ok, but then that should be easy as just using Begin Play on GameState with a HasAuthority switch and running on the Remote path - that path would indicate the GameState is valid on the client. You could do something like this even.

[charred crane]

Yeah I guess I'm not sure why I decided to do this inside my player controller

[sharp kestrel]

Welp, tried adding the player factions to the end and

Tbf I was doing it through one of the Match Start or something like that funcitons

[sinful tree]

Could do a queue for the players.

[sharp kestrel]

Yeah that's probably a better way to do it

So far so good, will need to do more thorough stress testing later to see how consistent it is over a network though.

[charred crane]

I duplicated this and somehow I'm getting 0 valid playerstates. I ended up solving this with a timer in the player controller that checks until the state is valid

[rich sinew]

Has anyone tried something like Networked Object Pool? Any idea about that?

[charred crane]

Somehow..my player controller's Event On Possess is no longer firing for clients, but they're able to possess the pawn and control it...

[meager spade]

missing super call somewhere in your c++?

[charred crane]

There is no C++ 😦

[meager spade]

wrong controller bp?

[charred crane]

Nope. I've been working in the same file. basically just changing what happens after my authority switch..and suddenly it stopped working

[neon ether]

You're probably no longer around now, but I was able to implement the design idea you laid out earlier with how turning it off and one for the server and client worked and it worked flawlessly, so thankyou very much for that knowledge. My only other question is that that lets say the client picks up the flamethrower and that player has the appropriate reference to that flamethrower it picked up. The vfx still spawns at the origin when its fired and i've been struggling to figure out how to tell that vfx move to the player's who picked it up muzzle location and show up there for the local machine and the other player. I've been playing around with the attachToComponent for the niagara component and I've only been able to get it to show up in the correct spot on the local machine while the other player always sees it at the origin.

[plucky prawn]

Are input events replicated at all?

[dawn ledge]

No input is on the client side

[somber glade]

I'm convinced unreal hates me. So we've packaged our dedicated server and quest client numerous times. We've been doing it for two weeks without issue. After setting up a video chat plugin that has nothing to do with the server, we can no longer join the server. We just join the server with an IP connection. This has worked flawlessly well over a hundred times. Now when I go to join I get "no game present to join for session" and it immediately crashes the app.

Server log just says join request, no game present, join succeeded, then closing open connection and disconnects

[kindred widget]

You generally shouldn't need any extra setup for this unless you're dynamically changing meshes in the skeletal mesh on the weapon. Once the mesh is set , you just have to call attach to component once with your socket name for the muzzle.

[somber glade]

Sorry for the crap no discord on this machine.

[thin stratus]

@somber glade if you only use IP connection, then the session stuff should be unimportant

Also the client log would be important

[somber glade]

So any idea what's going on here? I haven't messed with anything related to the connection.

Client is a quest

Let me see if I can find a lot

Log

[thin stratus]

Need the log, otherwise I can only use my crystal ball

[somber glade]

Any idea where those are kept on a quest?

[thin stratus]

Nope

[somber glade]

Found it I think. Let me see if I can get it off this machine

[thin stratus]

I will have a look at it once I'm in the office. Just woke up and only on the phone

Maybe you can see something in it yourself already

[somber glade]

Ah. Hmm... It may be a sound field

Yeah I've got a bunch of exceptions about binaural spatialization not found

[thin stratus]

Yeah not sure what that is hehe but glad you found a starting point

[somber glade]

After about 10 of those it starts throwing the no game present error

We went back to an older version for now. And still same game session

[thin stratus]

If you aren't using sessions then just ignore it

[somber glade]

But it works.

[thin stratus]

IP connections dont need those

[somber glade]

So it must be the audio crash

[thin stratus]

Yeah it is

[winged wave]

how would you go about adding features to the example ue4 shooter game? I mean, let's say you add something "simple" like wall jumps or jetpack movement, how do you make sure it's handled correctly multiplayer-wise and especially in case of network lag?

[fathom tinsel]

I don't think it is related to shooter game at all except for understanding how it works before adding your own implementations over it. It is more related to how things are actually done in multiplayer and that you will eventually learn by practicing. For efficiency you will have to follow best practices like minimum data transfer over the network and less use of multicasts by more focusing on replicated state for various events. You will eventually learn on the way so just start playing with various things and see how it works.

https://docs.unrealengine.com/4.27/en-US/InteractiveExperiences/Networking/Actors/ReplicationPerformance/ You can check this & find various other blog posts for what best practices you should be using.

[winged wave]

Thank you, I've never done anything multiplayer and I was trying to figure out "quickly" what are the key parts you have to add to "normal" code to make it multiplayer, I read a bit of the basics about replication, but still I have to understand if ue4 handles automatically errors at least for movement, or if you have to do your custom checks for everything

[fathom tinsel]

If you are beginning up with multiplayer then I won't recommend making a project over Shooter Game as it uses replication graph which might confuse you with some stuff like weapons added as depended actors over the player. I would recommend setting up a new project and try to make the shooter game on your own taking its animation and other stuff, that would help.

[fathom tinsel]

A simpler form of shooter game*

[fathom tinsel]

You can check ReplicateMovement on any replicated actor and it's location will automatically be replicated to all the clients. Also the character movement component specifically for character have some extra inbuilt client prediction stuff which handle much on its own so you don't have to worry much about it when you are starting out.

[winged wave]

@fathom tinsel Thank you, I am trying get up to speed as fast as I can, I got this task for an interview so I have not much room to learn at a normal pace. And they specifically asked to handle server-reconciliation cases, that's why I was asking about any particular pitfalls on the topic

[slate basin]

hey, does anyone know how to get the MaxNumber of players when you play in editor when you play as listen server/client with more than 1 player?
I tried checking the AGameModeBase::InitGame options param but that's empty

[chrome bay]

There isn't one in Editor

Can try AGameSession::MaxPlayers but it'll just be whatever the config default is I imagine, and probably won't even be respected.

[slate basin]

I guess I'll just wait a few seconds before changing the match state if it's play in editor then

[umbral horizon]

Are 20 replicated variables (replicating to all) bad for a game which wants to have 60-80 in game players?

How many replicating variables(without replifetime condition) should make me worry about it?

[bitter oriole]

Depends how often they change and their size

[umbral horizon]

Size in the sense whether they pointers or primitives?

[umbral horizon]

If you have to tell in general. What number of replicated variables won't worry you at all?

[bitter oriole]

There isn't one

And generally speaking if you need them, you need them

Don't replicate anything the clients can compute themselves and you'll be fine

[umbral horizon]

Hmm you are right. And setting up a replication graph can further help right if there are a lot of variables?

[bitter oriole]

Helps with server CPU time, IIRC

[umbral horizon]

Thanks

[grand mica]

Hey,
Something weird is going on. My character's basic movements have stopped replicating on other clients. What could be the issue?
I think the basic movements are replicated by default. Here are the properties

[grand mica]

weird, when i run the game through "Debug Editor" mode, it works different from running it from the editor. I have compiled the latest code in editor as well. This is weird

[slate basin]

how are you starting the editor?

if you made any changes, I think you need to compile Development Editor | win64

[grand mica]

debug editor directly from VS

and one from the launcher

I have compiled it, yes

[slate basin]

I think the launcher one or uproject runs Developement editor

[grand mica]

but things are running differently

[slate basin]

change the build configuration to Development Editor in VS and run debug from there? see if you get the same issue as you when you run from launcher maybe

[grand mica]

let me try

this one runs exactly like the one I was running from VS

so I can assume this is the right version of my work?

[slate basin]

try running the one from the launcher again

[grand mica]

ah they are working in the same way

and the basic movement of the character is not replicating 😦

[slate basin]

did you mean that the Development Editor version runs the same as Debug Editor and the movement is replicating fine?
also, anything in the logs?

[grand mica]

yes both are same now. Both from VS and launcher.

NO the movement is not getting replicated on other clients 😦

[slate basin]

did you override anything in your movement component class?

[grand mica]

yeah i put a bad check in begin play()

got my issue 😛

[grand mica]

thanks for the help tho

[slate basin]

does anyone know a good tutorial/blog/wiki that explains Beacons and sessions and how to use them together. I want to create a party system and lobby system, multiple parties (i.e. a party of 5, a party of 3, and a party of 2) can join the same lobby (if it was a 5v5)

[sinful tree]

Possess is meant to be run on the server and it is what calls OnPossess and looking at the engine source code, there's nothing indicating that OnPossess event gets replicated to the client.

[slate basin]

I tried this before too lol, I think you can know when the player possess pawn with OnRep_controller on the pawn or OnRep_Pawn (I think, might be something else) on the controller

[ancient badge]

Hello,
https://blueprintue.com/blueprint/gacuue7p/
I have this blueprint for an actor with 4 triggerbox, the code itself works fine.
For each triggerbox (down, up, left, right) i have the same code. For all 4 they work on the server and client,when only one is triggerd, but when two triggerbox are triggerd, for example up and down then only one works on the client, on the server both work. Someone an idea why on the client only one?

[elfin copper]

Hi Guys, I have multiple "Player Start" set in my topdown level. But only the server spawns with the camera facing the correct orientation, all the clients spawn in the correct location but facing directly towards their fronts. How to fix it?

[livid holly]

Hey folks. When using Fast TArray Replication (with NetDeltaSerialize), it's possible to override methods for client side notification of changes (PreReplicateRemove, PostReplicatedAdd, PostReplicatedChange). However these methods are part of the struct itself (the one derived from FFastArraySerializerItem). If an Actor class implements a fast array serializer, can the actor class be notified of these changes? Since the struct has no concept of owner, it doesn't know who the owning actor is, but I need the client side rep notifications to be accessed by the actor

[rapid rampart]

Hello there, could anyone please help me. I'm developing a dedicated server using third person template, but every time when the second player joins the server, it sees 2 characters overlapped for all the other previously joined players like the screenshot. Could anyone help or point me some documents about this issue please?

[kindred widget]

You can add a property to your struct and have your PostInitComponents set it. Then your struct has access to it's owner.

Alternatively, I'm semi sure you can add delegates to structs that the actor could bind events to.

[livid holly]

do you mean just adding a UObject* property and manually assigning it to the owner?

[kindred widget]

UObject*, AActor*, whatever you need.

[charred crane]

I ended up realizing that later and used a client rpc to get what I wanted done. Thanks for your help last night.

[pallid mesa]

How accurate is the ExactPing from the playerstate for prediction calculations?

[bitter oriole]

Ping isn't accurate, so it's good enough

[pallid mesa]

oh! I was thinking about sending the timestamp every time, but if this inaccuracy is somewhat acceptable... I can simply use it, or would you recommend something else?

[bitter oriole]

Ping is inaccurate by essence

It varies a lot

ExactPing is thus good enough

[pallid mesa]

Oh the variable is called ExactPing but I haven't seen how it is calculated

i know for a fact that this ExactPing replaced an old variable called ExactPingV2

so I believe the algorithm underneath has evolved quite I bit

Oh I see, you mean CompressedPing vs ExactPing, right? 😄

[bitter oriole]

I mean ExactPing in PlayerState is good enough and there's no need to go into more details

[pallid mesa]

right I got a bit confused by the statement of "Ping isn't accurate" 😄

thank you Stranger!

[bitter oriole]

Ping is not an accurate physical value

It's a variable that fluctuates permanently and is the sum of multiple values

Both your client and server performance have a large and direct impact on ping for example

[pallid mesa]

right, that I understand, thus asking if the UE implementation for pin was sufficient enough

[bitter oriole]

it is good enough, just remember to divide ExactPing by 4 for the correct value

[pallid mesa]

https://gyazo.com/07d69c7dae18ca9020ded9759b030288

won't need to in this case, using directly ExactPing instead of CompressedPing

but good having it in mind! Thank you a lot Stranger

it's already dividing by 4 in the early calculation as far as I could see

I'm on UE5 BTW

[elfin copper]

I have multiple "Player Start" set in my top down level. But only the server spawns with the camera facing the correct orientation, all the clients spawn in the correct location but facing directly towards their fronts. Anyone knows a solution? I've tried several different approaches like possesion, forcing camera view, etc and nothing seems to work

[slate basin]

Is this happening in play in editor?

[pseudo merlin]

hi all, lets say my rounds have a time limit. Is it ok to always replicate a float which represents time left in round? or is that a waste of bandwidth?

[lost inlet]

it's generally a bit better to use a time value of when the round time will expire

the game state replicates a server time value to clients by default

[pseudo merlin]

thanks 👍

generally should I avoid replication of floats set per tick?

[lost inlet]

like everything: it depends™

but if there's a more efficient way of doing it then I would say avoid, like in that example

[pseudo merlin]

makes sense thanks

[dull tinsel]

Whats the trick to getting the game mode to interact with clients properly?
I have my game mode handling team assignments and a lockdown event system.
I've basically set everything I can find to replicate everywhere, but I'm still not getting the same results on the client side as the server

[dark edge]

How are teams assigned and where does that data live?

[kindred widget]

GameMode doesn't really interact with clients at all. If it has necessary things to display, it'll replicate them through GameState or other managers.

[dull tinsel]

When each player joins it registers itself in an array in the game mode. Odd numbers are team one, even team two

Or vice versa

It's not really displaying so much as telling server owned actors to do stuff, but it isn't replicated on the client consistently.
Like one is a wall of cubes being scaled with the music spectrum frequencies. That replicates, but it doesn't replicate when the cubes are supposed to stop

[elfin copper]

Yeah, do you mean it will work in the packaged version?

[low helm]

The Clients do not have any copies of any game mode. Replicated events can never work there, and if you think they are working you mistook something.

[low helm]

What is probably happening here is that you are spawning replicated actors, in which case the actors themselves are sufficiently notifying clients of their existence

But you don't know how to send messages down to clients otherwise

Creating replicated actors is probably the easiest "replication" setup there is, but other types of messages will require a more elaborate understanding of Unreal's framework

[dull tinsel]

Ok, so move everything to the game state instead?
And correct. I have a fuzzy understanding of how replication in unreal is handled

[low helm]

the spawning of actors can stay on Game Mode

that will work anywehere the server calls it

Sending information to those actors should occur on the actors themselves, or you could use GameState as a decent alternate

Clients would (generally) get those updates (Multicast events I presume), though replicated variables tend to be a better way to send messages when possible

[dull tinsel]

My issue is I have several things that need to sync up for the lockdowns and I needed a manager to do that.
But I'll try game state instead and I'll make sure the events are multicast and the variables themselves set to replicate

[mint drift]

Hey guys. On a multiplayer game how to a get the player? instead of it

this is just a checker to see if it is the a player.

[sinful tree]

To quote zomg

Some places have different ways of getting the relevant player```
In other words, we need more context as to where you're trying to get and use this value.

[mint drift]

its a collision box, I want to check if it is a player.

if pawn == overlap actor do>

[sinful tree]

Do you want to check if it is a specific player, or any player?

[mint drift]

any player

any player but not NPC

[sinful tree]

So then you can check if it is a player by getting the "Other Actor" on the overlap, casting to pawn, and checking if player controlled.

[dark edge]

You already have that array, its the player array

[mint drift]

I wanted to avoid casting but its a good solution. Thank you

[kindred widget]

There are zero reasons at all why you should avoid casting to Pawn class for this check.

[sinful tree]

No casting required, but this is probably less performant than just casting to pawn 😛

[kindred widget]

Also worse in regards to the reason for avoiding casting. 😄 Cause now instead of just Pawn, you have Pawn, PlayerState an GameState involved.

[mint drift]

yeah I did the first case. It is a movable object, it will track all characters all the time, thats why. But its a pawn cast, so, I think its all good.

[next pollen]

Can anyone give me some insight as to why I don’t see this object on my clients?

It’s a skysphere, and I’m trying to spawn it from my level blueprint

[kindred widget]

Try using AlwaysRelevent.

Components may for some reason not allow it to be relevant by normal functions. Skysphere sounds like it'll always be relevant though.

[next pollen]

I’m seeing it on the clients now! Thanks for the tip

[graceful flame]

When using Seamless travel, should the Transition Map be a completely blank level? What happens if you place a static mesh or actor to indicate loading? Would that be better as a widget instead?

[fluid iron]

https://media.discordapp.net/attachments/735168498363400273/951654402974945330/unknown.png

im trying to make multiplayer game and this is the code for joining a session
i tried open level and execute console command and both of them are not working
idk what im doing wrong, in the tutorials they said to append "Open" and the "IP" in execute console command
or just open level and put the IP as the level name

[graceful flame]

The last node has to be a valid case-sensitive name of one your levels, not an IP.

[fluid iron]

so do i open IP and than open the level that the host is in?

@graceful flame

[graceful flame]

Like this, I think.

you can also use Listen for the options if its not a dedicated server

[fluid iron]

it just opens the level

[graceful flame]

What are you trying to make happen?

[fluid iron]

joining a session?

[fluid iron]

^

[graceful flame]

Dedicated or listen?

[fluid iron]

uhhhh, a session that someone created? ¯_(ツ)_/¯

[graceful flame]

So if there's already someone else creating a session, you can search for available sessions then pass that session into a Join Session node.

Are you using the Advanced Sessions plugin? https://forums.unrealengine.com/t/advanced-sessions-plugin/30020

[fluid iron]

like this?

[fluid iron]

nope

[graceful flame]

It gives more options, but it isn't necessary.

[fluid iron]

it still does nothing

[graceful flame]

There's no incoming pin connecting to the Find Sessions so it won't ever start.

[fluid iron]

i connected it xd

and it doesnt print any string

idk how

[graceful flame]

Which online subsystem are you using? By default you can't host a session over the internet without one.

[fluid iron]

nvm it worked

thanks

[fluid iron]

but why does tutorials use this method?

and why isnt it working

[graceful flame]

I'm not familiar with that method, I'm using the advanced sessions plugin with the Steam subsystem.

[toxic lion]

I have a function that (when called in a BP) is only returning the expected value when called in a RPC

    UFUNCTION(BlueprintCallable)
    FORCEINLINE AEquippable* GetEquippedItem() const {return EquippedItem;}

🤦‍♂️ no reference to var in GetLifetimeReplicatedProps

[slate basin]

Hey, anyone what the best way to get th number of connecting players to the server?

[fathom aspen]

Pretty sure there's a property in the #online-subsystems that gives you that(Probably OpenPublicConnections or ask in that channel). Or you can return the size of PlayerArray from the GameState, but I would stick to first method, as that's what it's for.

[stark tree]

Player 1 (host) can move but player 2 (client) can't - Hi, I'm creating a session with player 1, and player 2 joins that session. But upon joining session player 2 is unable to move or look around at all. It is not getting the pawn I believe

[dark edge]

Start with your Gamemode and making sure it's giving everyone the right pawn

[stark tree]

Should I change anything?

The host is VRPawn

But I think the client doesn't become VRPawn

[thin stratus]

@drifting trellis Please use the Job Board for things like this. See #instructions on how to post there.

[still coral]

Hello I have a question:
If I change the CharacterMovement's MaxWalkSpeed at runtime, does that mess with client prediction? Because that's what I'm doing, and client prediction should be smooth, but it's not 😅

[dark edge]

Yes

[still coral]

Ok, so I should probably create another variable that's used for the same behavior instead right?

Thanks btw ❤️

[dark edge]

That won't fix it, depending on what you're trying to do.

A long term change in max speed will be fine. A sprint won't.

[still coral]

I'm trying to get my character to start running at a certain speed and then gradually accelerate until it reaches a top speed

[dark edge]

I'd just tune the acceleration

Or you can do this, which is way more involved

https://youtu.be/RtQRMcupJs0

[still coral]

Oh yeah I followed at least part of that video 😁

[still coral]

Ok, that won't mess with the client prediction?

[dark edge]

No because it's the same everywhere.

Basically if you're trying to change movement stats at runtime that CHANGE has to be predicted

[still coral]

Hmm ok 🤔

[dense mason]

Is there a way to replicate this?

[thin stratus]

@dark edge @still coral I actually wondered how one does networked "Idle to Walk" transitions, that are sort of RootMotion.
Because actual RootMotion wasn't supported unless it's a Montage, or? Maybe they are using Curves in the Animation to adjust the MovementSpeed, which could be synced, but not really predicted.

[thin stratus]

Yeah, by making that Struct RepNotify and setting it on the Server and then setting the skeletalmesh in the OnRep

[dense mason]

You mean like this?

[random nymph]

I have a replicated struct in my playerstate. Any idea why the struct isn't replicated to client when changed on server? The struct has one string field and many arrays of enums

    UE_LOG(LogTemp, Warning, TEXT("Server switch trait"));

    FString enumString = GET_ENUM_STRING("ERuneTreeTraitType", traitType);

    FRuneLoadout newLoadout = OwnerHero->KingshuntPlayerState->SelectedRuneLoadout;

    for (auto& trait : newLoadout.BrutalityTraits)
    {
        FString traitString = GET_ENUM_STRING("ERuneTreeTraitType", trait);
        UE_LOG(LogTemp, Warning, TEXT("Trait before %s"), *traitString);
    }

    switch (category)
    {
    case ERuneType::Brutality:
        UE_LOG(LogTemp, Warning, TEXT("Server switch trait brutality to %s"), *enumString);
        newLoadout.BrutalityTraits[index] = traitType;
        break;
    case ERuneType::Willpower:
        newLoadout.WillpowerTraits[index] = traitType;
        break;
    case ERuneType::Survivability:
        newLoadout.SurvivabilityTraits[index] = traitType;
        break;
    default:
        break;
    }

    OwnerHero->KingshuntPlayerState->SelectedRuneLoadout = newLoadout;

    for (auto& trait : newLoadout.BrutalityTraits)
    {
        FString traitString = GET_ENUM_STRING("ERuneTreeTraitType", trait);
        UE_LOG(LogTemp, Warning, TEXT("Trait after %s"), *traitString);
    }

    OwnerHero->KingshuntPlayerState->OnRuneLoadoutReplicatedDelegate.Broadcast();```

The prints tell the trait switch is made but setting the SelectedRuneLoadout to newLoadout has no effect

Found the problem...

The struct was COND_AutonomousOnly

Which is strange that the first time setting it doesn't have any problems

[thin stratus]

Not 100%. There is no need for the Multicast.

[somber glade]

Does the blueprint node "is dedicated server" actually work when you have a dedicate server and how does it know that you are running on one?

[winged badger]

it checks the NetMode

[somber glade]

is that something that gets set automatically when you create a dedicate server or do we need to set that somewhere? We have a source engine that we're building a dedicate server on , but I think it's returning false on the server

[winged badger]

its read from the NetDriver

i think

anyhow, engine will set it correctly

[somber glade]

so it should be automatic, not something we need to worry about?

[marble gazelle]

It's automatic and works on my project fine.

[somber glade]

okay. weird.

[marble gazelle]

How do you start the server

[winged badger]

yeah, you can check for Client (beats Authority checks when client spawns stuff locally), Standalone, ListenServer or DedicatedServer

[somber glade]

We get a server crash if the server tries to start the agora plugin and we were getting a crash on that. So I assumed the 'is deidcated server' node wasn't properly returning true on it.

maybe something else.

[somber glade]

Topos_RotundaServer.exe /Game/ProjectContent_Topos_Gallery/Level/CustomLevel/LV_Fair_Square/LV_Gallery_FairSquare_ActorType -server -log

[marble gazelle]

well if the plugin can't be loaded on servers, you might need to exclude it from servers

[somber glade]

batch file with that in it

As long as the server doesn't try to create the object associated with it (which clients do, its' for voice/video chat) then it has been fine.

but I found out that 'is server' returns true on the client in some situations .

so I switched the check to 'is dedicated server'

[winged badger]

so goto c++ and use a preprocessor macro

if you suspect the check is failing

#if !UE_SERVER #endif i think

[somber glade]

Thanks, if this doesn't work I'll try that

[winged badger]

then the code inside won't even get compiled into server binaries

[marble gazelle]

#if WITH_EDITOR
#define YGG_IS_SERVER() (IsRunningDedicatedServer())
#else
#define YGG_IS_SERVER()
#endif

#if WITH_EDITOR
#define YGG_IF_ON_SERVER if (YGG_IS_SERVER())
#else
#if PLATFORM_COMPILER_HAS_IF_CONSTEXPR
#define YGG_IF_ON_SERVER if constexpr(YGG_WITH_SERVER == 1)
#else
#define YGG_IF_ON_SERVER if (YGG_WITH_SERVER == 1)
#endif
#endif

#if WITH_EDITOR
#define YGG_IF_ON_CLIENT if (!YGG_IS_SERVER())
#else
#if PLATFORM_COMPILER_HAS_IF_CONSTEXPR
#define YGG_IF_ON_CLIENT if constexpr(YGG_WITH_CLIENT == 1)
#else
#define YGG_IF_ON_CLIENT if (YGG_WITH_CLIENT == 1)
#endif
#endif

We basically use this. IsRunningDedicatedServer is Unreal API and it works perfectly fine.

[winged badger]

yeah, that code does not depend on NetDriver being instantiated yet

IsDedicatedServer() does

[marble gazelle]

so the issue could be related to the init order

[winged badger]

if the plugin starts up when modules are still loaded

yes

[somber glade]

well this is clear as mud... ```[2022.03.11-12.21.24:498][388]LogNet: Welcomed by server (Level: /Game/ProjectContent_Topos_Gallery/Level/CustomLevel/LV_Fair_Square/LV_Gallery_FairSquare_ActorType, Game: /Game/ProjectContent_Topos_Gallery/Blueprint/Core/GM_Topos_Gallery.GM_Topos_Gallery_C)
[2022.03.11-12.21.24:521][388]LogHMD: FSplash::DoShow
[2022.03.11-12.21.24:521][388]LogLoad: LoadMap: 172.30.1.34/Game/ProjectContent_Topos_Gallery/Level/CustomLevel/LV_Fair_Square/LV_Gallery_FairSquare_ActorType?game=/Game/ProjectContent_Topos_Gallery/Blueprint/Core/GM_Topos_Gallery.GM_Topos_Gallery_C
[2022.03.11-12.21.24:521][388]LogWorld: BeginTearingDown for /Game/Levels/AvatarSelection
[2022.03.11-12.21.24:524][388]LogWorld: UWorld::CleanupWorld for AvatarSelection, bSessionEnded=true, bCleanupResources=true
[2022.03.11-12.21.24:525][388]LogSlate: InvalidateAllWidgets triggered. All widgets were invalidated
[2022.03.11-12.21.24:559][388]LogAudio: Display: Audio Device unregistered from world 'None'.
[2022.03.11-12.21.24:564][388]LogOutputDevice: Warning:

Script Stack (0 frames):

[soft trout]

Hey, I am trying to setup a VOIP in my multiplayer project. (Steam works fine and all, players can join etc.) and it does not work at all. The debug texts shows that noone is talking, no mic is turned on and that it doesn't even work. In reality everyone can hear the host but the host is deaf and clients can't hear each other, furthermore this broken voice chat works in the lobby which is a separate map with a separate player controller and the voip gets initialized after joining the main map inside the player character blueprint. The VOIP is not even directional sound as all the clients hear the host regardless of distance always from behind. (I have attenuation setup and VOIP settings set.) I have been grinding the forums for 3 days now and nothing works. Does anyone has any idea how it is supposed to work? (UE4.26, AdvancedSessions plugin)

[thin stratus]

@soft trout as much as I can understand the feeling when you can't find out about a feature or a bug, please don't crosspost in 2+ channels.

[soft trout]

sry I wasn't sure where to post

deleted the other

[timber anchor]

Hello guys, I currently have an event that create a widget to every client if the server is actually executing it. Even if i set the event as Run On Owning Client this will be in any case replicated on Server+ All connected clients. Is there a reason for that?

[dark edge]

What's the gameplay you're trying to do?

Keep things stateful. What is this widget and why does it appear?

[timber anchor]

The widget appears because you are in a computer, and to leave the computer you just press a button.

Ill show you the logic i currently have

This event is executed everytime my interaction system, overlap with the Desk.
So you press E, and you actually sit on the chair.
If i try to spawn the widget ad the end of the Multicast event IN Run on owning client, this will spawn the widget everywhere, ignoring the Run on owning client

[spark owl]

What is the default dedicated server tick rate, and what is a good tick rate to set them to for the most smooth and stable experience?

[timber anchor]

^
Found a solution for what i was actually doing wrong.
Spawning the widget inside the player character was a stupid idea, since I was taking every Instance of the Character and spawning it.
This got solved by telling the controller with a cast to spawn it once i was seated, just with an event dispatcher

[gritty pelican]

Hi all. When the client connects to the server, Actor calls Begin Play for the client, but the replicated values are not ready yet. Where is a safe place to get the replicated values?

for example

void AXFoliageActor::BeginPlay()
{
    Super::BeginPlay();
    for (int32 i = 0; i < InstancesDeleted.Num(); i++)
    {
      UE_LOG(LogTemp, Warning, TEXT("i = %d, instance index = %d"), i, InstancesDeleted[i]);
    }
}

but at this time client don't have this variables

For example, can I do it in AActor::PostNetInit?

[fathom aspen]

RepNotify?

[gritty pelican]

@fathom aspen Yes, I'm using that now, I was just wondering if there was another way

[fathom aspen]

Yea seems like a legit way. OnRep works per replicated property and not for all replicated properties combined.

[gritty pelican]

PostNetInit does not seem to work for replicated properties. So I will use RepNotify

void AXFoliageActor::OnRep_InstancesDeleted_Implementation()
{
    if (!bInstancesLoaded)
    {
        HideDeletedInstances();
        bInstancesLoaded = true;
    }
}

[timber anchor]

Hey guys, any reason why a replicated component (Decal) Won't show in the client side?

[charred crane]

Could a widget reference exist on a player state?

[dark edge]

Maybe but bad idea.

Why would a PlayerState care about a widget?

What exactly are you trying to do

[charred crane]

What I'm trying to do is on P1 post login, send a message to all other players to create a health widget on their UI for this new player's character

What I tried was on post login ->game mode get all player controllers and client rpc(to player controllers) pass the new character but the character was invalid on clients

sorry not on post login, on possession. but i dont think that's much different

[dark edge]

That's Repnotify territory. When at all possible, use STATE and not EVENTS. The state is the Player Array, which exists in Gamestate.

[charred crane]

i don't think that the value isn't there yet, I think it's not valid ever

[dark edge]

What value? Every players pawn is certainly replicated. That's what you want to keep an eye on

Gamestate has a Player array (array of PlayerStates), and each PlayerState has a ref to their Pawn

[charred crane]

This image is from my player controller. If I repnotify Player Pawn, that will let Player 1 know that their pawn is replicated, but how would Player 2 know that Player 1's pawn has been replicated to them?

[dark edge]

Controllers are not on other clients

Client A doesn't see client B's controller

[charred crane]

oh right, so that won't work at all

[dark edge]

only the host sees all

[charred crane]

yeah I'm just not clear on how Player 2 will know when Player 1's pawn has replicated to Player 2

[dark edge]

Begin play on pawn -> Get local playercontroller or HUD -> register pawn? Not sure it's the cleanest but it'd work

I'm sure theres some onrep you can hook into that's cleaner

[charred crane]

what is register pawn? is that a node?

[dark edge]

That's what you'd make.

"Hey HUD, I'm here, show my HP to the local player plz"

"Hey HUD, I died, delete my HP bar plz"

not clean but it'll work

[charred crane]

how can i get the local player controller? just get player controller 0?

This is what I'm looking at. (on begin play of my pawn)

[dark edge]

Where are you setting HUD?

Why not just get HUD and do it

depending on if you need references to allies anywhere else

[pearl fog]

Hello, I have a question, for restricting chat messages to specific players should I implement a Client RPC inside the PlayerController or there is a way to provide a filter/mask to a NetMulticast ?

[charred crane]

HUD is created and set earlier in this flow

I'm not clear on what you mean by get hud and do it. thats what im doing

[dark edge]

HUD should be automagically created. Or are you calling some widget HUD?

are you using AHUD at all or just handling widgets in your PlayerController?

[charred crane]

Oh, yeha I'm not using the default hud, I'm using widgets that I spawn

[dark edge]

Where are you spawning them and what's managing them and holding their references?

[charred crane]

player controller is spawning it and holding it but it also gives the ref to the pawn

[slate basin]

hey, do you have to call BeginSpectatingState on both the server and the client or am I doing something wrong?

[dark edge]

Just have the pawn call RegisterMe on local PlayerController at BeginPlay and DeregisterMe at its EndPlay. PlayerController can handle it from there. It's prolly better to use HUD but PlayerController is fine.

There's no reason for a pawn to know about the HUD or even what a widget is really

just needs to tell the widget manager that it exists or is about to not exist

In you widget manager, you'd add the pawn to MyAllies when its registered, then call UpdateUI

which would read MyAllies and add/remove widgets corrospondingly

[charred crane]

So the image before the one i just posted work work?

[dark edge]

I mean it might but it's gross

Whatever manages the widgets, let it manage them. Just give it the bare info it needs to work

[charred crane]

i'm not really concerned with its grossness lol. I can clean that up

[dark edge]

that bare info being notifying it when pawns are created and destroyed

[dark edge]

Why is anything HUD related even being passed over the network

[charred crane]

Oh do you mean it being an RPC?

[dark edge]

You can just do this in PlayerController
Begin Play -> Is Local? -> Make HUD

Or do it state driven like I do in my projects.
OnRep HUDState -> Shuffle HUD around

Depends on if server should have any authority over the HUD or not

works GREAT for menus etc too. It's just a state machine.
Pressed Esc Button -> Select HUDState based on current HUDState -> Update HUD

that way Esc can close the open menu and open the main menu depending on if a menu is up or not

Update HUD just switches on HUDState and does its thing opening and closing widgets etc

[charred crane]

that would all be dope to discuss about 16 months ago

[fathom aspen]

Decals don't replicate. They are client-side only.

See this: https://forums.unrealengine.com/t/replicated-decals-the-proper-way/125231

[dark edge]

When in doubt, replicate the simplest amount of state. You don't replicate an actual mesh, you replicate its reference or name. You don't replicate a decal, you replicate whatever is driving that decal.

[minor nova]

I'd like to tear off an actor on the server and then immediately destroy it on the server. But when I destroy immediately, client's don't receive the TornOff call, i'm assuming because the actor is no longer around for the net update. Is there any way to respond to some post net update event inside of an actor on the server?

I see all the pre net update functions, but I don't see any post net update ones

[fathom aspen]

RepNotify?

[timber anchor]

It works replicating the actual Skeletal mesh

[minor nova]

repnotifies won't be called after tearoff

[fathom aspen]

Yeah you're right. You probably need to use RPCs. Check this: https://forums.unrealengine.com/t/onrepnotify-doesnt-work/356329

[dark edge]

You probably mean a reference to the skeletal mesh. You can certainly replicate a ref to the texture you're making the decal with, just not the decal itself.

[timber anchor]

Yes, exactly!

[dark edge]

@timber anchor so what exactly are you trying to do? What are you trying to replicate?

[timber anchor]

Decals of the mouth i sent before, that was attached as a component to a skeletal mesh (Replicated component)

But that's fixed as well! Thanks a lot man 😄

[royal vault]

How do i replicate Hierarcy instanced static mesh components?

for instance

i run this event from the server and it runs to all clients

this works perfectly fine on server,

however the client cant see the changes

the server however can see any of the clients run placed blocks

even if you dont use instanced static mesh components any general ideas on how this could be solved are welcome

the actor running these rpcs are owned btw

[fathom aspen]

Make sure the target actor replicates

[ashen stone]

Hey guys, for a albion kind of mmorpg is there anything on unreal for hosting and traveling between many maps?

[sinful tree]

That's nothing to do with Unreal specifically. You need to have a backend system that can launch and maintain servers for you, and then direct players to the appropriate Unreal server that's running the map in question.

As far as UE goes, you just need to be able to launch a server build on a server somewhere and let it register itself with whatever system you intend on using.

[ashen stone]

Just return the ip from this service and use LoadLevel?

[sinful tree]

Effectively, yes.

[ashen stone]

Ty

[dark edge]

Also if you have to ask, please don't waste your time trying to make an MMO

Make something small and fun, not something big, not even 1% done, and unplayable.