multiplayer

[torpid lantern]

I read somewhere that I should be using a "start server" & "start client" .bat file to test dedicated server. Is that valid and if so why?

[whole iron]

If I was to set "gamemode settings" in a lobby map, and then transfer to a map (and have the aforementioned "gamemode settings" be saved through the level transfer (and thus impact how the game starts and is played) how would I accomplish this?

[Using Advanced Sessions Steam for multiplayer rn]

[gentle mauve]

There's a Persistent Data Compendium pinned on this chat that might help you with this and other questions like it

[whole iron]

thank you my good sire

[heavy trench]

Hi everyone, I have been following this youtube tutorial on how to create both server and client builds: https://www.youtube.com/watch?v=DrkG3W8a_ls. I was able to successfully build/package both server and client, but I receive a crash when a client attempts to join the server:

2023.12.30-12.12.59:322][806]LogWindows: Error: === Critical error: ===
[2023.12.30-12.12.59:323][806]LogWindows: Error:
[2023.12.30-12.12.59:323][806]LogWindows: Error: Assertion failed: CurrentApplication.IsValid() [File:C:\GAS Course 5.3\UnrealEngine-release\Engine\Source\Runtime\Slate\Public\Framework\Application\SlateApplication.h] [Line: 255]

There is more to the crash log, so I am attaching it as well. Does anyone know what this error means? Any help would be appreciated, and thank you in advance 🙂

[frozen wraith]

anyone? 😁

[sour geyser]

im stilling having trouble with this issue. would be glad if any would give the question a shot 😄

[latent nest]

In ue4, is playfab the best way to create multiplayer games for modes like team deathmatch and stuff, or should i try steam, or something compeltely different?

[dapper arrow]

Anyone have pointers on how to get behavior trees to play audio? I tried having the creature it's attached to send a multicast event but it doesn't seem to be sending it for some reason.

[hollow eagle]

Looks like that's inside a BT node? Those don't replicate, they can't have RPCs on them.

[quasi tide]

1. Because BT isn't being ran on the client
2. Don't design it like this - call a function on your AI that does the multicast

AIController is what runs the BT, via a braincomponent. AIControllers don't exist on the client (at least not from what I recall)

[dapper arrow]

Thanks! I'm a week into this so still figuring things out, so when you say call a function on your AI you mean the actual creature (in this case it's a robot)?

[quasi tide]

Yes

You can create an interface that you'd put on any AI that will run this node and inside the implementing actor, you'd call a multicast RPC

Or do a component that replicates

Up to you

[dapper arrow]

Yeah interface was what I was imagining in this case to make it more universal. Just to make it crystal clear, BT is never run on the client, therefore if I try to have it do a multicast it essentially does nothing because the other clients do not own the BT

[quasi tide]

Correct

There may be some setting somewhere where you can do it. But that'd be a very niche thing.

[dapper arrow]

Makes sense, yeah I've learned it's best to play by the normal engine rules to make it happy. Thanks for the info!

[exotic merlin]

Hello all, I'm running into an issue with a simple client server game, i've tested my game on both multiple machines and with network emulation and I get the same results. The issue is that character movement becomes a bit "chunky" once any amount of lag is introduced (25ms with network emulation). I have a simple ACharacter and I'm using the movement component to replicate to the server (I've tried to remove all other processing that might cause hitches). While I expect the lag, I didn't expect the movement to become hitchy, is this an artifact of running in the editor? or something else I'm doing wrong (if it's just the way it is, I get it, I just want to make sure I understand why). Thank you! (I can provide video if that is helpful).

[gaunt cliff]

--sigh-- So... I'm rather new to unreal engine multiplayer and I'm struggling with where to put what. I have a vague understanding how to use gamemode, player controllers, characters, etc... but when I want the client to communicate a manually changed nickname from their side to the server, I'm struggling with where to put the logic. I can do it... I've seen some people set variablesin game state since it's persistent until you close the executable and separate on client and server.

But, there's also player state.

My first idea was on the gamemode... on post login, to annouce "player xyz has joined the game!"

and "OnBeginPlay" I'd grab the game instance, and grab those variables. Buuuut I know the server has a game instance, by running "get game instance" in the gamemode of a server, wouldn't I be grabbing the server's game instance and not the client's?

And if I am grabbing the client's game instance, what if I want to access the server's game instance, how do I go about knowing which game instance I'm grabbing?

Essentially when in a multiplayer game... how can I call "get game instance" for clients and also "get game instance" for the server specifically? How are those calls different?

do I need to do custom events that say "only run on server"? or is there a better way?

[thin stratus]

@gaunt cliff

GameInstance is persistent, not the GameState

GameMode is server only, calling GetAnything there gets the server side version anyway

If you want the Client's GameInstance, you will need to ensure you call GetGameInstance locally

One way of doing that is in the BeginPlay of your PlayerController, limiting the call to local via IsLocallyControlled and a branch

You then need to send a Server RPC in the PlayerController with the Name retrieved from the GameInstance

In the server RPC you can then get the GameMode (since you are now on the server) and call ChangeName with the new name etc

In c++ it would theoretically be a bit simpler as there you could send the name in the connection string which is available in Login and PreLogin (not exposed to BPs)

[gaunt cliff]

ahhh that's what i've done for creating widgets, is locally controller -> add to view port...

i knew game state wasn't persistent, so im wondering if i should load variables into player state from game instance, then access the player state from the server, to avoid RPCs?

[thin stratus]

You can't avoid RPCs

If you think you could then you are still highly misunderstanding this whole multiplayer thing

[gaunt cliff]

they can be expensive though, for something as simple as a name, I've setup nametags above player heads using only rep notify

i don't want to completely avoid rpcs

but the player state is automatically replicated right?

[thin stratus]

Stop thinking about stuff being expensive

[gaunt cliff]

🤣

[thin stratus]

You can't even program multiplayer games yet. And you are using BPs

If you want to be performant you will need C++ anyway

The RPC is required in your situation

You need to send the name to the server

[gaunt cliff]

could i load variables into my player state from my controller, or... my gamemode (main menu) then once a player joins, I can access those variables from the replicated player state?

[thin stratus]

No

[gaunt cliff]

i believe you, but could i get some understanding as to why not?

[thin stratus]

Only the GameInstance survives the joining of the server

So after joining all your PlayerController, PlayerState etc are fresh and new

And to set something in the PlayerState so the server can access it you still need to rpc

[gaunt cliff]

ahhh so anything on my client player state won't be in the copied servert player state

[thin stratus]

Correct

[gaunt cliff]

wait... why do they say player states are replicated to all clients?

[thin stratus]

There is no copy

It's a new object

[gaunt cliff]

or does that mean the server sends us player states, not the other way around

[thin stratus]

That means that a PlayerState of a given player is available to all connected players

Nothing else

Regular replication rules still apply

[gaunt cliff]

so it's like the player state object is automatically multicasted to all other players? am i saying/understanding that sort of correctly?

[thin stratus]

The PlayerState, same as any other replicated Actor when spawned by the server, will be spawned by the client/s too

Connected via a NetGUID

Have you read the compendium already?

[gaunt cliff]

I've browsed through it, but haven't extensively studied it no. I will defintely look more through it. I am curious, I followed a tutorial on how to put nametags above player heads and have that replicated to all clients, and the name is set from the client first. Is this using an RPC? I only see the rep notify

in my "onrepname" function

it's accomplishing this, i think without an RPC?

or is it an rpc just without using a custom event?

[thin stratus]

Why would this need an RPC

The server already had the default player name

[gaunt cliff]

because im uploading a player name from client to server and then having all players see it?

[thin stratus]

No you are displaying the default player name in those screenshots

Nothing there says you are uploading stuff

[gaunt cliff]

ohhh it's the get player name running on the server, correct?

for context, this is a view from the player character class

without steam running (using advanced sessions plugin) it just displays my computer name with part of the net ID stuck on the end

[thin stratus]

Yeah that's the default usually

[gaunt cliff]

gotcha, I'll dig more through the compendium. I just had this feeling using RPCs all over was the wrong way to do things, like unreal engine had a different built in way to replicate variables to and from the client/server

Multiplayer is wacky to wrap my head around, things in single player were easy because you can put logic anywhere usually, at least on a persistent level

Now... I'm haivng to learn the proper way to do things and where to put certain logic

It's... a lot but Im very interested in getting it right

the long way if need be

thank you for the insight @thin stratus

[thin stratus]

Client to Server is almost always server RPC in a client owned actor

Server to client is normal replication of variables

[gaunt cliff]

so rep notify and multicasting right?

[thin stratus]

With OnRep being an optional convenient addition to get notified when the variable replicated

In BP that's more a property changed notify, so it calls for server too and also if the client would Change it locally ( then only on the client though )
C++ it only calls for clients. When the server sets the variable and it replicated

Additionally server can client RPC on a client owned actor to target a player

Or multicast in an actor that is replicated to everyone

Such as GameState, Character, PlayerState and such

Or your own fwiw

[gaunt cliff]

I'm very glad I took a few classes in c++ and did quite a bit on my own. It made it a lot easier reading through advanced sessions source files and then to unreal engine's PlayerState header files... finding the declaration .cpp didn't feel straight forward though in visual studio.

I definitely plan to dive into unreal's c++ soon here because it's not alien to me, but I'm greatly enjoying mainly doing blueprints for now. I still have much to learn.

I also found a little tidbit to smack me on the head in terms of security concerns... having a client dictate anything is usually not a good idea

"What do you mean by “send data” then? You can send whatever events or functions you want, at whatever time you want, to the server. How does this not let you send data to the server?"

"Btw: In general, sending data (rather than just UI/events) to the server greatly increases the attack surface for cheaters/hackers. There may be cases where that’s OK, but I’d be very careful about this in any game put up on the internet."

and from another post I found...
"For replicated variables, the server has authority. So for the client to dictate anything you’re pretty much limited (rightfully so) to RPC."

"You really need to be more clear what you’re trying to accomplish with this client-server relationship. The answer to this question is dependent on this."

https://forums.unrealengine.com/t/how-do-you-send-data-from-the-client-to-the-server/14541/7

[obtuse field]

How can I debug server when it crashes? Running Launch Seperate Server - true and Run under one process - false

I know it produces logs, but I can't e.g. look up the variables in IDE during debug mode, like with client crashing

[hollow eagle]

attach the debugger to the new process

[pseudo crest]

Hello, often in my multiplayer game the player's character freezes in the current animation frame instead of simulating physics when he dies, anyone knows why?

[whole bobcat]

I'm fairly new to making multiplayer game was curious on what part to start on first i was thinking of making a single player game first then working to make it multiplayer but idk if that is the best approach or not -

[quasi tide]

Definitely not. Design for multiplayer from the start.

[worn steppe]

yeah adding multiplayer to a single player design is the kind of thing they make people do in hell

[mystic marsh]

Start with one of the sample projects. Always run in client server, not standalone or listen server. Multiplayer isn’t easy, but adding it later is 10x harder.

[mystic marsh]

That was my first actual paying job. Never again.

[quasi tide]

Is it reasonable to assume PostNetInit will run after PostInitializeComponents?

[worn steppe]

dear god the ways you must have suffered

[dark edge]

The game is pretty much done, just gotta add multiplayer

That's like what, 10% of the whole game? Ez

[sharp vigil]

how often is the gamestate updated to clients?

[thin stratus]

Check its Replication Settings I guess

It's an actor after all

[sharp vigil]

Ah ok thanks

[fathom aspen]

No. Only thing you can guarantee is PostNetInit running before BeginPlay and only on dynamically spawned actors

Since PostNetInit never runs on static ones

[buoyant hazel]

Hi guys, I have a locked door with a password, when I go to the door and press E, if it's locked, it display a widget asking for the code, you type the code and if the code is correct the widget trigger an event interface to the charactere BP and then, the charactere BP ask the server to unlock the door on the door BP. When the widget trigger the event on the charactere BP It failed due to "no owning connection for actor BP_charactere". Do you have any idea why ?

[fathom aspen]

ask the server to unlock the door on the door BP
This is your problem

Actors not owned by the player can never fire meaningful server RPCs

Move the server RPC to the character and it will work

[buoyant hazel]

this is the charactere bp :

[buoyant hazel]

The widget is triggering the keypad event, then the charactere BP tries to call a server event to trigger the door unlock. Is that what you meant ? Thanks for your help

[fathom aspen]

no owning connection for actor BP_charactere
Yeah I just realized the spewed error is referencing the character...

...which is weird in your situation since if you as a player able to control your character and move to that spot and press an input, then it means the controller is actually owning your character

So the character in theory should have a net connection

In this situation I would really debug the hell of what's going on in cpp

[buoyant hazel]

Yeah and when I pressed M key I look is locally controlled and everything is fine. If I trigger the same event not from "keypad" but from a key pressed it work just fine. But when it pass by the keypad event it failed "not owning connection"

[fathom aspen]

Indeed if it passes the IsLocallyControlled check then it should not fail with that error

[buoyant hazel]

Oh I forgot to say, If the server is doing it everything work fine from the keypad to the characterre to the door. The issue is only when I try it white a client

[fathom aspen]

Yeah a server would never get that error

Since the whole logic is local to the server

[buoyant hazel]

I had the same code on another project and it worked just fine from the first try, I wanted to rebuild it with the plugin "multiplayer modular lobby", I'm not sure why but maybe the plugin create the issue...

[fiery wadi]

If for example I have Map 1 which uses Map1GameMode which has a Username variable inside it, then the player is transported to Map 2 which has Map2GameMode how would you get the Variable from Map1GameMode during the OnEventPostLogin event please?

[fair latch]

When you travel, that game mode actor is destroyed. You can store any variable you want in game instance or savegame object before opening level

Then when the level open, you can read the variable from where you store it (game instance or savegame object)

[limber gyro]

i have a dash in the CMC that works in the editor but doesnt work in shipping, has any one seen this before?

[fathom aspen]

To add to what has been said, such a variable can always be concatenated to the Options String which gets sent to the server for a joining client. In fact there is already a "Name" option that you can use (look for InitNewPlayer() function for more) @fiery wadi

[fiery wadi]

Ahh ok thanks for the info, I Was storing the username/playername in the GameMode from Map1 but ofc (Lobby Map) GameMode2 couldnt see it I didnt know you could pass through data in the travel info I,ll look at INitNewPlayer() also but I,ll also look at the SaveGame Object too thanks, Just a quick question I would assume a SaveGame Object is a constant over ANY game mode/instance, and the same can be applied with a Game Instance (IE... The Game Instance is the same regardless of the Game Mode when changing Maps)?

[fathom aspen]

SaveGameObject is saved to your disk, hence why it's resilient to travels

However it's going to be local to your player/client, meaning that you will still have to send it to the server

[ebon sentinel]

Hey guys, I'm running into an issue with an event not firing. It's a super simple actor which auto recieves input from player. On the server all of the prints fire up normally but on a client, the "Pressed Action1" print string fires but SR and MTC do not. I've also attached the replication settings for this actor. Thank you all in advance.

As you can see on server all of them fire. But on Client, only the Pressed Action1 fires and then it gets stuck

[fathom aspen]

The obvious usual reason for this is that the said Actor is not owned by the player

The flash light actor in your case

Only Actors owned by the player can fire server/client RPCs

If you was to check your output log you would see an error that says: "no owning net connection for actor flash light"

Actors owned by the player are usually: PlayerController, PlayerCharacter, PlayerState

[ebon sentinel]

Oh yeah

Okay so in this case, when the flashlight is "equipped" I can set its owner to be the player and it should work okay I assume

[fathom aspen]

Not that I recommend such an approach

Imagine that you need the same thing for your door

Vending machine

[ebon sentinel]

Was going to ask about more global stuff like a door yeah

[fathom aspen]

And whatever other thing that might come to your mind

Just route it through the previously said actors

If the player was to own the actor, it means that no two players can "control" the same actor at the same time

[ebon sentinel]

So essentially, have an "interact" event that fires on the player and not the actor itself (like the door) that then routes and fires up any relevant event? Like opening the door would be handled via the interact that is housed on the player. Then the multicast would open the door. I have something similar for picking up the flashlight and dropping it which is handled by the player char and they work just fine

[fathom aspen]

Usually you do own the actor, when that actor is a weapon that gets attached to the player for example

[fathom aspen]

Indeed

[ebon sentinel]

Awesome! But what about an actor that needs to fire events that never gets interacted? Like say a chest that would just open on its own

Does it need to be routed through something?

[fathom aspen]

No, since it's not instigated by the player, but instead driven by the server

In such an actor you just fire the multicast just fine

Multicasts are excluded from the previous rules

[ebon sentinel]

Oh right, because the event fires on the server and then the server tells everyone else

[fathom aspen]

Unowned actors can fire them just fine

Correct

[ebon sentinel]

Thank you, that clears up so much!

[fathom aspen]

Good to note though, that the use of multicasts in your case is still questionable

Multicasts have two weaknesses

They don't care for late joining clients, and they don't care for clients that the actor they are fired on is not relevant

Fire a multicast, make a client join, the newly joined client won't see the effect of the multicast

[ebon sentinel]

I see I see

[fathom aspen]

That's why you refer to "replicated properties" in such a case

https://vorixo.github.io/devtricks/replicating-tracked-events/ a great related article that I can reference here

[ebon sentinel]

Oh wow this is a very good resource

Thanks!

[fathom aspen]

Yeah the whole blog is super useful

np

[quasi tide]

Wack

[fathom aspen]

To be honest I would love to be able to assume that BeginPlay fires after replicated properties are received on statically placed actors

Like it's the case for their dynamically spawned counterparts

[quasi tide]

Is there a PostNetInit equivalent for static actors? Why wouldn't it fire off for static actors?

Not that I need it. Just curious.

[fathom aspen]

Sadly no. It wasn't built to work that way

Basically:

if (Actor && bSpawnedNewActor)
{
    SCOPE_CYCLE_COUNTER(Stat_PostNetInit);
    Actor->PostNetInit();
}

bool bSpawnedNewActor = false;    // If this turns to true, we know an actor was spawned (rather than found)

Guess imma just yolo and remove that additional check and call it a day

[quasi tide]

That's just silly.

Where do you find this?

(Not at my PC at the moment)

[fathom aspen]

UActorChannel::ProcessBunch

I think part of this decision comes from the fact(?) that the engine isn't capable to guarantee receiving all replicated properties in the initial replication frame for such statically placed actors

But I just can't think of a valid reason as to why the engine won't have such a capability

[thin stratus]

I wonder if that bug with OnRep still exists, where if you have an OnRep, InstanceEditable boolean (for example) set to TRUE in the BP class, then to FALSE in the Instance.
And then set the Boolean to TRUE on BeginPlay (Server only) that it wouldn't call OnRep for the Client

[whole bobcat]

Goodnesses I'm glad i asked sounds like i almost wasted a lot of time

[fathom aspen]

Dang, I can't recall I ever used InstanceEditable on a repnotify property... so it sounds like the local value is being pulled from the CDO of the archetype rather than the instance 😬

[thin stratus]

Yus, that was or maybe still is the issue

[fathom aspen]

I think I just solved an enigma I have been chasing for a while now. Basically if you are using streaming volumes or WP, sooner than later you will start getting the following warning in your logs:
LogNet: Warning: UActorChannel::ProcessBunch: SerializeNewActor failed to find/spawn actor. Actor: MyDumbActor

It simply means that a certain Actor that is (1) replicated, and (2) placed in your level, has failed to load. The issue happens when the engine replicates the actor before it had a chance to load, which results in the ActorChannel failing to permanently open, and will remain closed until you force a reload of the owning streamed level. The issue will also have better chances to happen if you introduce lag and packet loss.

It turns out that Epic knows about this issue, and hence why they already implemented a mechanism to protect against it. However it seems that they just never cared to enable the most important piece of the mechanism

#if UE_WITH_IRIS
    static bool bShouldServerUseMakingVisibleTransactionRequest = true;
#else
    static bool bShouldServerUseMakingVisibleTransactionRequest = false;
#endif
    FAutoConsoleVariableRef CVarShouldServerUseMakingVisibleTransactionRequest(
        TEXT("LevelStreaming.ShouldServerUseMakingVisibleTransactionRequest"),
        bShouldServerUseMakingVisibleTransactionRequest,
        TEXT("Whether server should wait for client to acknowledge visibility update before treating streaming levels as visible by the client.\n")
        TEXT("0: Disable, 1: Enable"),
        ECVF_Default);

Basically the server doesn't wait for the client's Ack, and yolos... what feels weird to me is that they only enabled it for Iris... like wtf
I ran some tests with the CVar enabled and it seems to fix the issue, but I have to yet run more tests.

[fathom aspen]

Pff turns out it doesn't really fix it although that's really what it is meant to be fixing 😮‍💨

[abstract aspen]

im just ask the question at the sake it sounds dumb..... does my quest system need to be replicated for a multiplayer game thats not sharing the quest with other payers?

[quasi tide]

It depends™️

Nothing wrong with replicating information if it makes it easier for you.

[abstract aspen]

it will be simple things just to go from starter area to next town or something nothing major just want to add a little interaction

[quasi tide]

You can do that entirely server side, sure. But the client has to have some way of knowing what quest they're doing and what objectives they have. As well as current progress of said quest.

[sweet sage]

Is there a way to maintain array order over network?

[mystic marsh]

A replicated array will have the same order on the client as it did on the server

[sweet sage]

It does not have rn

i`m trying to create a replicated inventory

[mystic marsh]

What’s your array property look like?

[quasi tide]

Not necessarily

A little bit ago, siliex did a good job at explaining how things can fail in a real world scenario

[sweet sage]

Maybe i will need to use N serialized objects instead of array?

My array is fixed size anyway

[mystic marsh]

A UPROPERTY(Replicated) TArray<AActor*> will have the same order, eventually, BUT since not all the actors will be replicated at the same time it may initially have null entries in it on the client

Or for longer if they're not all relevant to that client, for example

[sweet sage]

When i reorder array (changel element from index 1 to 2) will it replicate?

[mystic marsh]

Yes

[sweet sage]

It is not, i`m not sure why :c

[mystic marsh]

Again, what does your property look like? Does it replicate at all?

[sweet sage]

Humm

This is not the problem

I found the problem

It is UI bug

Looks like i need to call SetListItems again

every time it changes?

[mystic marsh]

You definitely have to do something when it changes, yes

That isn't binding the list view to your array, it's setting the list view up with a copy of your array in it's current state

[sweet sage]

I see, ty

[sweet sage]

No, it is replication problem

It is not replicating changes

When i reorder on server this OnRep_Items is not even called

[mystic marsh]

And you have a DOREPLIFETIME for it?

[sweet sage]

Yes, it works when i change containers

for example

Look

`When i change from slot index 0 to 1 on bag container it change order on server but no client

maybe FFastArraySerializer can fix this bug

[mystic marsh]

Seems unlikely, but maybe it'll help you track down what's really happening. What you've posted so far should be straightforward and should work.

[sweet sage]

"The tradeoff is you have to mark elements in the array as dirty when game code changes them. List order is also not guaranteed to be preserved between client/server in all cases."

List order is not guaranteed. I think the only way is using RPC

UItemContainer::UItemContainer(const FObjectInitializer& ObjectInitializer) :
    Super(ObjectInitializer){
    Items.SetNum(40);
}

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

    DOREPLIFETIME(UItemContainer, Items);
}

UItemInstance* UItemContainer::GetItem(int SlotId) {
    if (SlotId >= 0 && SlotId < Items.Num()) {
        return Items[SlotId];
    }

    return nullptr;
}

bool UItemContainer::TrySetItem(int SlotId, UItemInstance* Instance) {
    if (SlotId >= 0 && SlotId < Items.Num()) {
        Items[SlotId] = Instance;

        return true;
    }

    return false;
}

bool UItemContainer::ReplicateSubobjects(class UActorChannel* Channel, class FOutBunch* Bunch, FReplicationFlags* RepFlags)
{
    bool WroteSomething = Super::ReplicateSubobjects(Channel, Bunch, RepFlags);

    for (int32 Index = 0; Index < Items.Num(); ++Index) {
        WroteSomething |= Channel->ReplicateSubobject(Items[Index], *Bunch, *RepFlags);
    }

    return WroteSomething;
}

UFUNCTION(BlueprintPure)
TArray<UContainerItemModel*> UItemContainer::GetContainerItems() {
    TArray<UContainerItemModel*> Models;

    Models.SetNum(Items.Num());

    for (int32 Index = 0; Index < Items.Num(); ++Index) {
        Models[Index] = NewObject< UContainerItemModel>(this, UContainerItemModel::StaticClass());

        Models[Index]->Container = this;
        Models[Index]->SlotId = Index;
    }

    return Models;
}

This is my ItemContainer code

bool UItemContainerBase::TrySwapItem(int SlotId, UItemContainerBase* OtherContainer, int OtherSlotId) {
    if (IsValid(OtherContainer)) {
        if (OtherContainer == this && SlotId == OtherSlotId)
            return false;

        UItemInstance* SelfItem = GetItem(SlotId);
        UItemInstance* OtherItem = OtherContainer->GetItem(OtherSlotId);

        if (TrySetItem(SlotId, OtherItem))
        {
            if (!OtherContainer->TrySetItem(OtherSlotId, SelfItem)) {
                if (!TrySetItem(SlotId, SelfItem)) {
                    return true;
                }
            }
        }
    }

    return false;
}

this is the swapper code (called from client and run on server

chat gpt generated

40 items for me, much better

[mystic marsh]

That bit aboutorder not guaranteed seems to be a quote from https://ikrima.dev/ue4guide/networking/network-replication/fast-tarray-replication/ which is not pertinent to simple array replication

[sweet sage]

Simple array is broken

I will repeat 40 properties

my inventory is fixed

[mystic marsh]

But horrifying

[sweet sage]

Look this shit

[mystic marsh]

no

[hollow eagle]

fast arrays do not guarantee order. But quite frankly that shouldn't matter, just make your own ordering property on your struct

you don't need to worry about the order of the array if that's not what you actually display anyway

[sweet sage]

I need order to swap items

[hollow eagle]

you don't though

you just swap the values of their "order" property

the actual position of the item in the array is irrelevant

[sweet sage]

I see

[mystic marsh]

This is what I've done for inventory too - there is no replicated array at all. Items know what container and slot they are in, and the client builds an array from that. The inventory has no replication at all other than existing, basically.

That said, what you were trying to do should work and is simpler to think about initially.

[sweet sage]

What

the 40 properties?

[mystic marsh]

No. No replicated properties in the inventory at all. Only in the items.

Is what I'm done. I'm still suggesting your original array should work.

[sweet sage]

I tried the 40 things and it is broken, maybe it is another code

I think it is the Outer object not changing

I fixed the bug

bool WroteSomething = Channel->ReplicateSubobject(Equipments, *Bunch, *RepFlags);

Channel->ReplicateSubobject(Bag, *Bunch, *RepFlags);

Replaced this with

bool WroteSomething = Channel->ReplicateSubobject(Equipments, *Bunch, *RepFlags);

WroteSomething |= Channel->ReplicateSubobject(Bag, *Bunch, *RepFlags);

and now it works

[pseudo crest]

It happened again with a client, instead of dropping to the floor his Mesh stayed frozen but it did lost the collision as in the function

I'm starting to think that when a client is playing an animation and he dies, it gets frozen when I execute the simulate physics node.

The function is multicasted and simple. I don't know yet why this happens

[thin stratus]

@pseudo crest Reliable multicast?

In theory this is all a state and should be handled via OnRep instead of Multicast

[pseudo crest]

It's not reliable but all my friends that are testing with me have low ping and good connection

[pseudo crest]

Oh, I didn't used any OnRep yet, all tutorials I saw where using the RPC-> MC method

[thin stratus]

Yeah most tutorials also suck

And if they do it and it's important then it should at least be reliable

But OnRep would be better

[pseudo crest]

Well, I think I gonna change to OnRep and test to see if it stop the bug

@thin stratus thank you

[summer tide]

I'm trying to replicate BreakConstraint function. I was able to replicate SetContraint.

[onyx jolt]

Can we use playfab dedicated server for multiplayer mobile game only. Android and ios only. With features like matchmaking lobby etc (pubg like).
Does playfab support for both Android and ios?
And any other good service except playfab then please suggest also

[thin stratus]

You should check that on PlayFabs Website and forum

[raw thunder]

Hello everyone,
I have a UI that is waiting for a valid player state. I was checking the OnPossessedPawn but sometimes on the client the pawn is changed before the player state is valid. What is the proper way to wait for the player state initialization?

for now the way I do it is like this but I don't like it...

[sharp vigil]

I notice when I run my game as a client->set team ID of player->then retrieve team ID-> I get a default value I coded instead of the one I set.
This is all happening in the beginplay portion of my blueprint. Everything is being executed in sequence.

If I retrieve the team ID after the beginplay event is finished then my team number is the value I set.

Am I just not accounting for latency in this case? Or is there something more going on?

[raw thunder]

Did you create the teamID variable yourself?

[sharp vigil]

Yes

[raw thunder]

You can use OnRep function for cases like this

[sharp vigil]

It's on a component. The code works perfectly if I'm the listen server

[raw thunder]

And you are setting the variable on the server ?

[sharp vigil]

Yes

The code still functions properly if I'm the client and get the value after beginplay has ran through on my BP. So I think my code is correct for client/server

[raw thunder]

I suggest to use a OnRep Notify function, like this every time the value is changed you can run your code

[sharp vigil]

Yeah that's the thing too. I see it saying the team is changed on client and server with my onrepnotify as well

[raw thunder]

What is the issue then?

[sharp vigil]

Hang on.. screenshotting..

This is a part of my beginplay. The team ID is set. Then when I go to initialize my HUD I get the team ID. The team ID I'm retrieving is incorrect.

If I take that initialize function out of begin play and manually trigger it retrieves the correct team ID and everything is hunky dory.

[raw thunder]

Oh so in the intiialize function you need the teamID ?

Yes this will not be replicated directly since it needs time to go to the server and come back, What if you put the Initialize in the OnRep function?

[sharp vigil]

ah good point okay I think I see the path forward. This is due to latency then

Thanks!

[raw thunder]

Yes 🙂

[sharp vigil]

I'll have to do some on rep in my BP then. My code is mostly in C++ but I do the UI stuff in UMG

appreciate the help

[raw thunder]

No problem

[onyx jolt]

If we used Amazon gamelift dedicated server. Can we use Amazon online subsystem to connect it?

[sharp vigil]

I was thinking of doing a delegate on the on rep function and it would be triggered if the client was the NETROLE. Not sure how that work in my BP if I was the server.

Is there a clean way to say "OnRep is finished being called on both client and server" so I can continue executing the rest of my BP?

[fiery wadi]

I just wanted to say Happy New Year to all and thanks to all the professionals and people in the "know", Who spend their time helping the rest of us with issues. 🙂

[raw thunder]

The OnRep function will be called when you change the variable on the server (instantly) and the OnRep on the client will be called when the value gets replicated to the client. So as soon as you receive the OnRep on the client it will already be finished on the server.

[sharp vigil]

My concern was if I had an event where it just triggered on the client being updated but someone was a listen server

like if I had on_rep->event triggered->populate HUD

[raw thunder]

I am not sure to follow

[sharp vigil]

I want to trigger an event after on_rep is finished. That event will populate my HUD. The only reason I'm having an event to populate my HUD is because the issue I was facing earlier where the client wasn't switching the variable fast enough when beginplay was called

but if I have an event on on_rep in just the client portion of it that wouldn't work for p2p multiplayer right?

Since someone is playing as the listen server

[raw thunder]

Why not call the HUD initialization directly in the OnRep?

[sharp vigil]

because that code is in my C++ while my HUD initialization is in my blueprint.

[raw thunder]

I'm not on my computer but can't you override the OnRep function in BP? Or yes you could create a function for this

[sharp vigil]

yeah I think that'd work

thank you

[raw thunder]

Great 😉

[noble sentinel]

Why clients cant apply damage to server? Im running it on server

[raw thunder]

Check if the damaged actor is valid in your RPC

[noble sentinel]

Well yeah, Im not sure I have a RPC

Isnt this running on server thing RPC?

I think I messed something

[raw thunder]

Where do you call bodyshot and headshot server? These functions are RPC to the server. I think the variable damaged actor will not be valid if you check it in these functions. You likely need to add this as a parameter in your function and pass it when you call the RPC.

[noble sentinel]

Im calling them run on server like this, and its working now after I change them to this, both happening in player bp

[raw thunder]

Great

[fiery wadi]

Any ideas why T1 Points is 0 when I have 4 Player Start objects with Tag's T1 in the map please

This is done within a Lobby Game Mode, I have a Lobby Map which uses this Game Mode and then a Player chooses a Team to be on T1 or T2 and then the game mode choose a random location out of the T1 or T2 Spawn Points but because theres no T1 spawn points being returned for some reason it cant place an actor in a random location

I tried getting all actors of Player Start then looping through their tags and it output So it;s recognising all the tags for the player starts so not sure why the array is still 0. :S

I decided to loop through all the player starts instead and filter them by their tags as that seemed to be working not sure why the othe way wasnt working

[blazing spruce]

Hi, I've got a spectating system set up so when the player dies they start speccing other players but i want the spectating player to be able to see any post processing effects that happens to the player they're spectating, right now im doing some post process fx when the player gets into low health states for example but the spectating player doesn't see them because I'm only running them on the owning client atm, how can I go about changing it so that the post processing fx are also replicated to any currently spectating players as well?

[torpid lantern]

So when my server spawns an actor, I need to create a widget and then store the actor's ref. on that widget.

For the sake of performance, would it be better to fire off an interface call to the local player's controller and have them create that widget - or create the widget and set variables on the server immediately after actor spawn? Or does it not matter?

[quartz star]

I'm trying to rotate my character when pressing 'a' or 'd'
The replication works fine except that my client only rotates with half the speed than the server does.
I printed out the new rotation yaw and it seems like the client is not increasing the yaw value every second function call.
Can someone help me with that?

Log:

LogBlueprintUserMessages: [DefaultMap] Client 0: 0.41667 
LogBlueprintUserMessages: [DefaultMap] Client 0: 0.83334 
LogBlueprintUserMessages: [DefaultMap] Client 0: 0.83334 
LogBlueprintUserMessages: [DefaultMap] Client 0: 1.25001 
LogBlueprintUserMessages: [DefaultMap] Client 0: 1.25001 
LogBlueprintUserMessages: [DefaultMap] Client 0: 1.66668 
LogBlueprintUserMessages: [DefaultMap] Client 0: 1.66668 
LogBlueprintUserMessages: [DefaultMap] Client 0: 2.08335 
LogBlueprintUserMessages: [DefaultMap] Client 0: 2.08335 
LogBlueprintUserMessages: [DefaultMap] Client 0: 2.6293
LogBlueprintUserMessages: [DefaultMap] Client 0: 2.56594
LogBlueprintUserMessages: [DefaultMap] Server: 0.41667 
LogBlueprintUserMessages: [DefaultMap] Server: 0.83334 
LogBlueprintUserMessages: [DefaultMap] Server: 1.25001 
LogBlueprintUserMessages: [DefaultMap] Server: 1.66668 
LogBlueprintUserMessages: [DefaultMap] Server: 2.08335 
LogBlueprintUserMessages: [DefaultMap] Server: 2.50002 
LogBlueprintUserMessages: [DefaultMap] Server: 2.91669 
LogBlueprintUserMessages: [DefaultMap] Server: 3.33336 
LogBlueprintUserMessages: [DefaultMap] Server: 3.75003 
LogBlueprintUserMessages: [DefaultMap] Server: 4.1667 
LogBlueprintUserMessages: [DefaultMap] Server: 4.58337 
LogBlueprintUserMessages: [DefaultMap] Server: 5.00004 

My Code:

void AOceanityPlayerController::TurnShip(const FInputActionValue& Value)
{
    float InputAxisValue = Value.Get<float>() * GetWorld()->GetDeltaSeconds() * 100.f * GeneralTurnSpeed;
    const FRotator ActorRotation(GetPawn()->GetActorRotation());
    const FRotator NewRotation(ActorRotation.Pitch, ActorRotation.Yaw + InputAxisValue, ActorRotation.Roll);
    GetPawn()->SetActorRotation(NewRotation);
    UKismetSystemLibrary::PrintString(GetWorld(), FString::SanitizeFloat(NewRotation.Yaw));
    Server_ReplicateShipRotation(NewRotation);
}

[mystic marsh]

Servers can’t create widgets

[torpid lantern]

I just double-checked and I did gate this behind a "Switch has authority = remote".

So would that mean all of my players are going to try and create this widget? I do have the intended player controller set as the "Owning Player" pin and the logic does work, but I don't want have player B try to create widgets for player A, if it's not needed. Likewise I don't want to be sending interface calls to the controller if it's not needed.

[mystic marsh]

Any client you want the widget to appear on needs to create the widget. Player controllers only exist on the server and the owning client. So if a controller opens the widget, only that client will open it.

[torpid lantern]

Thank you!

[hushed sigil]

I'm having this replication issue where the first time a player picks up an item it's not replicated (client side it's still sitting on table, with empty hand). But after putting it down subsequent pickups are replicated just fine.

After doing some research I'm wondering if this is some net dormancy issue (somehow not detecting the item needs to be replicated the first time it wakes up)

I could try and force replication but wondering if I'm missing some other underlying issues. Shouldn't every time an actor moves it should get replicated?

[latent sapphire]

so i have this code that suppost to move the items around when i press the interact key and it does that but when i try to replicate it is buggy and it only replicates to th client and not back to the server

[limber yoke]

Hey I just realized that there's a multiplayer chat and have been attempting to fix a problem over in #cpp . Does anyone who understands the UE socket system have a moment to help me with an unintended behavior?

To give context, I am attempting to create a socket for every character that is spawned. These sockets connect to an external python server that generates a unique socket for each one, processing the data, and sending back movement instructions to the character. This works great with a single character, but when I add 2+ characters, my python server sees the unique sockets that were created for each character, but UE abandons all sockets except one. It begins sending all character information through a singular socket and receives all data to that socket.

[mystic marsh]

You’ve only made one static socket. Right at the top. The second client will overwrite the first, etc. You’re losing track of all but the last socket created.

You need socket to be a member of the character or a component or something, not a static variable

[limber yoke]

OHHHHHHH I think you're right. That is so strange! So even though the class is instantiated independently in each character, it shares the memory for the static socket?

[mystic marsh]

“Static” means there’s only one for the entire application

[limber yoke]

You're a god send. This is huge and a dumb misunderstanding of how classes work on my end. Thank you!

If you don't mind, do you have any tips on implementing this better? I have this loop hooked up to the onplay

[latent sapphire]

how do you get an actor to replicate

or whats the best way to do it

[quasi tide]

Just check the "Replicates" box in the details panel

[latent sapphire]

but it makes it jitter

[quasi tide]

Or in the constructor (in C++), set bReplicates = true;

[quasi tide]

That is something different

You asked how to make it replicate

That is how you make it replicate.

[latent sapphire]

ok

[latent sapphire]

well it jitters but it also doesent replicate from the client to the server

[quasi tide]

That's because replication only happens from server to client

[latent sapphire]

ok

[quasi tide]

"it jitters" means jack all without more context

Am I just to magically know what you're doing?

[latent sapphire]

my fault

i have a blueprint that allows me to pick up objects

but i need it to replicate the movement

how would one do this

[hexed pewter]

In a mutliplayer Arena FPS game scenario as a method to prevent Wall Hack cheats is it possible to not send information about other players positions to the client until that client is about to see them? Say there is some method of determining if Player A is going to see player B on the server in 300 ms and only then send the players positions to each other?

[quasi tide]

That's pretty much how Riot does it with Valorant

[fossil spoke]

I believe from memory the ShooterGame example project has something akin to this.

I could be misremembering though.

[dark edge]

Yes, but that's hard

You can't just check if visible, then replicate as that introduces delay

you need to check if about to be visible, which is a much harder problem

[onyx jolt]

Red point online subsystem is good for multiplayer?

[fossil spoke]

It is very good.

[onyx jolt]

U used it bro?

[fossil spoke]

I have and still do.

[onyx jolt]

You are using dedicated server or peer to peer?

[fossil spoke]

I use both

Also Peer 2 Peer is not what you probably think it is.

Your 2 options are Dedicated Server or Listen Server

[quasi tide]

I have their EOS one. I've only heard good things.

[onyx jolt]

which dedicated server should i use for easy setup with EOS red point?

[quasi tide]

Oh snap. I also have the Online Susbsystem one. Didn't even know that. lol

[blazing spruce]

Anyone got any ideas on this one? would like to cross it off my list lol

[fossil spoke]

The spectator would need to know the same information in order to emulate the same effects.

How you manage that is up to you I guess.

Personally, something like Health is typically information that everyone might want to know (although this can be untrue for certain games depending on their requirements).

If the Health was replicated to everyone, then the Spectator would have the information on hand to manage playing a PP effect when necessary.

[blazing spruce]

Awesome never thought of it like that, gonna give this a go, cheers!

[hollow eagle]

World->GetNetMode()

[mystic marsh]

It matters a lot what kind of subsystem it is. If it’s a GameInstance subsystem the world and game mode won’t be initialized until after this subsystem.

Siliex is right anyway. Use GetNetMode instead

[hollow eagle]

almost nothing about the world will be ready

subsystems are initialized super early

that's why there's a separate begin play event from the usual initialize function on world subsystems.

but even if the gamemode was ready you still would be doing things the wrong way here, net mode tells you whether you're a server or not.

seeing if there's a gamemode or not is a very roundabout way of getting that same information.

and preprocessor directives for this purpose are strictly wrong, they are evaluated at compile time. The editor cannot change their result, nor can deciding to run a game build in server mode.

[mystic marsh]

Creating subsystems you don’t need isn’t really a big deal by itself either. The existence of one doesn’t have any meaningful cost. So you can just let it create it anyway and later, when everything is initialized, decide if it actually needs to do work or not.

[hollow eagle]

this has nothing to do with cheating

a subsystem existing or not will not do anything about cheating

[mystic marsh]

If you want code that’s only on your dedicated server, you can do that, but the right way is to put it in a separate server only module

[hollow eagle]

just do NetMode != NM_Client...

"authority" is also the wrong term for this

if MAX is passed in then something is very wrong

and you're likely about to crash anyway

you can also do < NM_Client if you really want

but it's the same thing in effect

[mystic marsh]

return !GetWorld()->IsNetMode(NM_Client);

[hollow eagle]

because it's wrong

authority is an abstraction away from client/server, and clients can have authority over some actors

there is no concept of authority over a world

or a subsystem, or whatever

when someone says "the authority" the implied bit is "the authority over this actor"

but that's not what you're checking here. You're just checking if you're a server or not.

don't call GetWorld

that's what the outer is for

const UWorld* World = Outer->GetWorld();
return World && !World->IsNetMode(NM_Client);

the instance of your subsystem that ShouldCreateSubsystem is being called on doesn't have access to the world. That's why Outer is passed in - if the subsystem gets created then that will be the object that owns the subsystem. But until that decision has been made your subsystem isn't "real".

it's not niche

how can you ask a subsystem whether it should be created... if it's already been created? Or the reverse - how can you ask something that doesn't exist whether it should exist?

the object that function is being called on therefore isn't the real subsystem (it's the CDO).

also, the documentation outright says (some) of this

you'd find out by running the code you originally posted

GetWorld would always return nullptr

[mystic marsh]

It’s niche insofar as most of the billions of people in the world don’t know it. However, as an Unreal developer, the idea that CDOs exist outside of any world is a fundamental concept. CDOs for native classes are all constructed during application startup. Running your code with a breakpoint in that method is indeed a great way to learn that. Yes I shouldn’t have said GetWorld, it’s fairly obvious in hindsight why that function is getting passed an Outer to use.

[sharp plover]

Is there any way to update both the skeletal mesh with animations from code? Right now I have the issue that the skeletal mesh gets updated with the Move RPC server side, which causes me to have a higher net tick rate, but can this be controlled manually and manually ticked?

I just want to manually tick it regardless of what, based on the data in the anim bp, no rollbacks or anything like that

[latent nest]

I know this isn’t a play fab support really but I have a few questions. I’m just doing development and I’m wondering if playfab is the best way to go for hosting, or is another type. And if it is, I know it’s free but it tells me to add a credit card. Will I be charged?

[sinful tree]

No one can answer for you if it's the best way to go for hosting. You'd have to figure out if it fits your requirements of cost, features, reliability, scaling, etc. and compare that with other hosting sites to see what fits you best.

A lot of the features in Playfab are "pay per use" in the free tiers so if you happen to use a feature that they charge separately for, then yeah, you're going to get charged. Going above 150k requests also seems to incur charges, so if you've coded something poorly you could potentially use up those 150k requests quickly depending on how many requests you're making. Finally, 750 compute hours hosting is free per month which is equivalent to having 1 server running 24/7 for 31 days (probably on their "cheapest" tier of server). If you happen to have more than 1 server running or request a more powerful server you could end up using more than those 750 hours and get charged.

[fossil spoke]

Niche is relative.

If you work with these things constantly you find out quickly what is and isnt niche.

[latent nest]

Do you think it’s worth it to do playfab. My end is goal is to have a battle royale game mode, and also an other tdm related game mode. I’m mainly looking for a dedicated server hosting that I can use

[sinful tree]

I wouldn't be able to answer that as I've not used Playfab. Do you actually have a game that is basically ready to actually start being hosted by third parties?

[latent nest]

I’m near it. What have you used before?

[sinful tree]

I only ask as it may not be wise to focus on hosting if you've yet to complete larger portions of your project. It's good to figure it out, but unless you have a game to be hosted, why bother with trying to have it hosted at all.

Personally I've tinkered with Gamelift a bit and Braincloud though not the hosting aspect with Braincloud though they do offer it.

Still, I don't believe figuring out the hosting service you should use is something that anyone can really guide you on - it's heavily dependent on what you're expecting out of a backend service and what you need it to do, and how well you can work with what they offer to meet your goals.

I'm sure there's some barebones hosting service out there that gives you scalable servers, but gives you nothing else, like storage or leaderboards, and they may be dirt cheap, but that may not be what you actually want, and may be more difficult to try and integrate some other third party service to add those additional features.

[latent sapphire]

https://www.youtube.com/watch?v=KPStJGB_tD0how would one make a system like this with blueprints

ive already tryed

i guess im doing something wrong

[latent nest]

Mainly right now I’m testing it for development and making sure everything works and lines up. I’m also looking to online store values and thst stuff

[latent sapphire]

im using a physicshandle

[summer tide]

How do you save and load players in multiplayer? So I have simple project. I don't have a lobby. I start in editor with 1 server and 1 client. Save the game by iterating over all BP_Character then save their stats and location. When I load i load the save-game, but then what? Also when saving players what else need to be saved?

[chrome bay]

Heads up that this won't work in editor because of the obscure lifetimes of PIE Worlds. There's a working one here:
https://github.com/TheJamsh/UnrealSnippets/blob/main/Code/World Subsystem/ST_WorldSubsystem.cpp#L65

GetSafeNetMode() being the key part to look at

[fathom aspen]

James, for real you gotta PR that function ❤️ 😄

[chrome bay]

Honestly it's such a horrible workaround I'd be amazed if they took it. It's borderline pure luck it works 😄

All just down to how the editor splits off game instances for PIE, the whole thing is such a mess

unsurprisingly

[fathom aspen]

works™️ > fancy

yup typical PIE

[fathom aspen]

I would like to bring your attention to this if you don't mind, maybe you can shed some light or something

Basically if you leave the streaming volume and re-enter it super fast, net startup actors will fail to load on client

[chrome bay]

Urgh :/

[fathom aspen]

There is a system that is meant to protect against that using transaction IDs with acks and what not but it fails miserably

What I can tell you though is that from last night's investigation is that Iris works flawlessly on 5.3 at least

[chrome bay]

I wonder if it's some kind of naming collision thing, since those net startup actors will all be identified by their path name

[fathom aspen]

Right. I assume it's just the server not caring really about these pending acks and yoloing replicating that actor

Will have to do more iterations to pinpoint the issue

[chrome bay]

I remember in HLL we had so many hard to repro issues with map-placed actors replicating (even though we didn't use streaming vols etc) - we ended up making everything dynamic with spawners. We only had a handful of them though, wouldn't have worked on a large scale for sure

But that was like pre 4.25 too

[fathom aspen]

That was a suggestion indeed, but I'm too stubborn to make it work this way.

[chrome bay]

Yeah definitely not an ideal solution

[fathom aspen]

Yeah dormant initial actors would lose their value for example

At least now I got an incentive to move to Iris xD

[chrome bay]

Yeah mind you that isn't free of it's own trials and tribulations 😄

[fathom aspen]

Indeed. Gotta evaluate what sucks less

But I feel that Iris is making its way to stability real fast

Fortnite is porting its RG infra to Iris

[chrome bay]

Yeah FN is gonna be on it asap, got a good hunch that Iris will be out of experimental come 5.4

[whole iron]

Whats the best way to get an FPS character? Not true FPS where the real world model is used for the player, but one where the hands and weapons are rendered ontop of the other objects in the scene (so they cant be clipped into the walls) and potentially adding legs/feet to make it so when you look down you can still see your legs and feet?

I've heard about using panini projection, but I also have heard that causes lighting issues
I've heard about using a scene capture to render the actors into a UI layer
I've heard about modifying the engine and adding render layers (so you can render certain objects on-top of other ones, which is sadly not a default feature of UE5...)

Thoughts?

[chrome bay]

Make the mesh tiny.

Literally the simplest way to do it

If the mesh is contained within the player capsule, no blocking collision will clip though it anyway.

[whole iron]

but if anything does get into the mesh it appears insanely large comparitively (as well as the whole receiving light/shadows as well as casting shadows thing)

[chrome bay]

You need to make the mesh so small that nothing can do that, then just attach it to the camera. FPP mesh doesn't usually cast shadows on anything but itself.

Receiving shadows, well yeah - if the mesh is tiny, it'll be either in or out of shadow usually. Not much you can do about that

Obviously if they need to interact with in-world objects via animation etc accurately, then any kind of reprojection or shrinking is not gonna work

Lots of ways to approach it in general but it depends on the game really. For a generic FPS I'd just be shrinking the arms + attaching to the camera, and using some kind of material FOV reprojection to avoid them looking awful at different environment FOV or on ultrawide screens

[bright summit]

why am I getting same player reference? I try to check different players but "target" is always same object

[alpine wave]

Hello
I'm using console Command "Open"to connect to the server, will this command be available in shipping builds?

[fathom aspen]

Obviously not. OpenLevel does the same more or less

[alpine wave]

Thank you

[errant veldt]

I need some help regarding Multiplayer. In the game when the server instance is loaded there are 4 abilites which the player can overlap to take it.

So if a server takes an ability and the client connects at later time. the client does not know if the server (or any other client) has taken any ability already or not..... so what logic do i put where? (Game State, or Player state)

[glacial zealot]

Im trying to learn about multiplayer frameworks, and I nearly understood all about gamemode, gamestate,playerstate, gameinstance, but I have a doubt about a thing in particular.
I'll use the Mario party example: basically you have the board with each position of items, stars, coins, players and each player inventory informations, then at the end of the round you change lever and play there, then the winner info is passed to the board level again, the thing that I dont understand is that as I understood the only frameworks that persists on level change are playerstate and gameinstance but seems not to be safe to store informations there isnt it? Because keeping the informations about item on board position to load again when reopening the board level and when gamemode and gamestate are created again in gameinstance is easily manipulated by client and also gamemode and gamestate are created based on the level.
Where am I wrong?

[somber jasper]

Is there a way to switch from using EOS to NULL for LAN sessions, if Internet is not available ?

[crisp shard]

how would you do a function every 30 days in real time? as in, a player uses a certain currency or power but it regenerates every 30 days ?

[fathom aspen]

I think not. It's their duty to ensure that they get the net mode properly

But it's a nice addition regardless

[crisp shard]

lmao, so when they use the particular variable, i set a timestamp on the server? when you say backend, you mean just on server right? or is there a particular node/function you're saying that does this?

realtime basicaly effects the game, and the server should already know this based on the time

would this require some outside coding ? like a javascript or something basic?

ok dope that makes sense, yea i have one idea, but not efficeint , and yea dont know anything about javascript i just picked one that i knew of lol

[fathom aspen]

I would not eleminate them for this, but instead work my way around it. Something dirty you can always do is destroy the subsystem locally where you don't need it 😄

[crisp shard]

does this mean it's easily doable?

[fathom aspen]

And answering your question, I think it's just to save yourself some memory that you know you are not gonna use. Also bugs...

[crisp shard]

dope yes, maybe i'd have it give a couple of calls to regenerate like 2-3 times during this 30 days, but yea that makes snese

[fathom aspen]

For example a client execution path that tries to get the subsystem silently is way worse than crashing to a non existent subsystem

(Where a server was only meant to do so)

Worst case scenario you will get a subsystem that you didn't care about, best case scenario you will crash 😄

Indeed, hence why I wouldn't care about fiddling with it

No, you're good. I actually have a "visual" use case, where I only hold back clients from initializing the world subsystem, but still use the subsystem in a way where I need it on clients

[chrome bay]

Yeah I wouldn't think so tbh, the only reason I've added it myself is just so I can have server/client only subsystems that might not be relevant to the other etc. Qite a rare case though and is usually MP specific

[nocturne quail]

the functions we call on beginplay don't need to have any Server or Multicast properties?

I mean if I call this function on beginplay,

    UFUNCTION(BlueprintCallable, Category = "Component Update")
    void UpdateMag(TSubclassOf<class UAccItem> MagAccObject);

does it need to be UFUNCTION(reliable, client) or UFUNCTION(reliable, server) ?

[fathom aspen]

You should never need to call a replicated function on beginplay

Because if teh actor exists on all then beginplay will be called on all

If anything you would change replicated properties on beginplay and that's typical

[nocturne quail]

so calling a non-replicated function on beginplay with if(HasAuthority()) means the function will be treated as it was a UFUNCTION(reliable, server) function?

[fathom aspen]

Kinda. If you call a server rpc on begin play, it might get called twice. Once locally on the server, and once when the real rpc fires on the server

[nocturne quail]

yeah logically

[fathom aspen]

It's just pointless to call rpcs on functions that would end up calling on server and client

That's a rule of thumb to remember when using rpcs

[nocturne quail]

BeginPlay calls functions as reliable or non-reliable?

[fathom aspen]

I'm not sure I understand the question

BeginPlay will reliably call functions if it executed in the first place

[nocturne quail]

great

Thank you for the lesson 😄

[glacial zealot]

bump

[noble sentinel]

Can anybody tell me why when I look from server player to client, bones are hidden, but client player can still see bones on server player.

[noble sentinel]

Also, the bird have a "set simulate physics" node when it die, client can trigger the event but cant see the result, and birds bp looks like this

[fiery wadi]

Can someone please clarify if im thinking correctly about this, If i had a Widget for T1 and T2 to select a character this OnClick would fire to the Controller then the Controller would send the relevant Team choice to the Server(GameMode) to spawm the relevant Charactr Class (T1 or T2) So order of logic Widget->Controller->Server

[glacial zealot]

Guys how can I add the enchanced input in multiplayer? Like this it works only for server, shouldnt begin play run both on server and client? i tried adding a branch with is locally controlled and wasnt working for both

[quasi tide]

The way I do it is in C++. The PC has a function that gets called by the server when it possess a pawn. AcknowledgePossession. I set up the bindings in that function. Works fine.

[glacial zealot]

So basically onpossess?

And then i add that there might work

[quasi tide]

onpossess runs on server only if I recall

I can't remember exactly

[quasi tide]

Pretty much, yeah. Use the controller as a vessel to talk to the server from the UI.

[torpid lantern]

Is anybody here familiar with GameLift integration & OpenSSL? Trying to build the .dll files for GameLift, but my terminal is throwing an error:

Could NOT find OpenSSL, try to set the path to OpenSSL root folder in the system variable OPENSSL_ROOT_DIR (missing: OPENSSL_CRYPTO_LIBRARY OPENSSL_INCLUDE_DIR)

I've double-checked my environment variables are set per the readme, but still no luck. Realize this might not be the correct community and I am open to suggestions on where else I can find support.

[thin stratus]

I mean, your first stop should be on GameLift's forums

[blazing spruce]

Hi, I'm having some issues with replicating post process effects over to spectating players.. when a player dies they'll start spectating the next alive player but if the alive player has some post processing effects on screen, the spectating player cant see them because I'm only running them on owning client, any ideas how i can change this to get it working how i want? I originally was just gonna get the current pp settings of the alive player and apply them to the spectating player when they start spectating them but because im using Set View Target with Blend the spectating player doesn't have a camera to apply the pp settings too since their view target is now the alive player, so i'm a bit lost on how to do it since the spectating player doesn't have their own camera anymore, any ideas?

[noble sentinel]

Im still stuck at this.

[dusty void]

Made a new project and copied over a bunch of code so I could have my game use UE 5.3.2 and have Enhanced Input be the default used input system, and my game is getting this error and it has smth to do with calling IsLocallyControlled() in my OnRep, I didn't have this issue at all in my last project and everything works well up until this point, ill give anything else you'd need, thank you for helping

[dark edge]

Put print strings in your code. Does the event any damage even run?

[noble sentinel]

Code runs properly, but only for server player.

[dark edge]

How far does the code get clientside?

[noble sentinel]

Client character can damage bird and kill it but after dying that ragdoll/Animation code only works for server

[dark edge]

Does the multicast make it to the client?

[noble sentinel]

no, only server player can see

[dark edge]

You really oughta be using replicated variables and RepNotify though

I wasn't asking what they see, does the multicast event fire on the client?

[noble sentinel]

I guess its because players dont own the bird actor, isnt it?

[dark edge]

First off you shouldn't have a run on server event here

detect damage serverside, then set a replicated bool, and in the onrep, set the ragdoll state

you can multicast the ragdolling for now but there should not be a run on server event here, it's redundant. Client can't call it anyways as they don't own the bird.

The run on server event should happen when the client shoots, not when they hit something

[noble sentinel]

I didnt get it, the event happen when actor health is 0, so how can I know actor health is 0 before it hits?

I dont know much about that repnotify nodes

[hidden lion]

What causes an object to resolve to nullptr randomly during gameplay, after it was initially resolved to a valid pointer? in the debugger its valid, not marked pending kill and registered in actor subobjects list

TSharedPtr<FRepChangedPropertyTracker> UNetDriver::FindOrCreateRepChangedPropertyTracker(UObject* Obj)
{
    check(IsServer() || MaySendProperties());

    const FObjectKey ObjectKey = Obj;
    checkf(ObjectKey.ResolveObjectPtr() != nullptr, TEXT("Unresolveable object %s received in FindOrCreateRepChangedPropertyTracker"), *GetNameSafe(Obj));

    return UE::Net::Private::FNetPropertyConditionManager::Get().FindOrCreatePropertyTracker(ObjectKey);
}

[noble sentinel]

my damage code is this btw, and its working when players kill each other, both client and server can see other player dies and ragdolls

but same code dont work on bird actor

I really hate that owner thing...

[dark edge]

Because this run on server event is being executed within something the client owns (their pawn)

You shouldn't do it like that though

[dark edge]

You don't need the redundant run on server events

[dark edge]

Your code is running on server from here on out. The apply damage is only being called on server, so just act as if you're the server from Event Any Damage

[noble sentinel]

I understood that, but I still cant find a way how to let bird actor ragdoll run on server

[dark edge]

It already is

assuming the damage function gets called, the code is working serverside

check that first

make SURE the damage function is getting called when a client shoots a bird

[blazing spruce]

Ive also tried adding a post process component to the player and apply the settings to that but its also not working lol any ideas how i can do this properly?

[dark edge]

I feel like you're making this WAY more complicated than it has to be

First off, what actually runs the timeline?

[blazing spruce]

I prolly am lmao but thats cause i aint figured out how to do it a better way yet! So every time the player takes damage it checks to see if their health falls between a certain range, if one of those ranges are hit it'll call the respective timelines

For the post processing FX i essentially wanted it so if they hit half health a heartbeat sound starts playing, when they hit quarter health range the heartbeat sound will slow down its BPM and play some post process FX and then same again when they hit low health range, which is working as i have it now but timelines are a bit of a bitch to make sure they account for all possible outcomes lol

But right now i'm trying to figure out how to make sure that the spectating players can see what the alive player sees on screen and hears the heartbeat sounds

[dark edge]

You really need some repnotifies I think

And yeah, runs on owning client

spectator isn't owning client

[blazing spruce]

Yeah ik its run on owning client but I'm not too sure on how to change it to make it work for only the alive player and the spectators without replicating it to everyone else

[dark edge]

IDK what your current setup looks like in depth but I'd approach this by just driving the FX state by some replicated state (your HP)

[blazing spruce]

So i should do them in my health on rep?

[dark edge]

I would. Assuming HP isn't private and you already have it replicated

Then it's just up to the client as to what to do about it

[blazing spruce]

Yeah my health is already set to on rep, so in the on rep function do i then just need to call the range check event from there or is there a better way to determine different ranges?

[true stream]

Is there a way to "know" (listen?) when the server spawns an actor on a client?. (so I can do stuff on the client)

[dark edge]

I mean I would map hp to some variable StrawberryJamIntensity and smooth it over time and drive my stuff with that

[dark edge]

begin play

[oblique arrow]

void AItemInteractableBaseClass::SetVisiblityForWidget()
{
    float Radius = 200.0f;
    TArray<FHitResult> Hits;
    FCollisionShape Sphere = FCollisionShape::MakeSphere(Radius);

    FCollisionQueryParams Params;
    Params.AddIgnoredActor(this);

    if (GetWorld()->SweepMultiByChannel(Hits, GetActorLocation(), GetActorLocation(), FQuat::Identity, ECC_WorldStatic, Sphere, Params))
    {
        for (FHitResult Hit : Hits)
        {
            AActor* HitActor = Hit.GetActor();
            ASentinelCharacter* SentinelCharacter = Cast<ASentinelCharacter>(HitActor);

            if (SentinelCharacter)
            {
                InteractWidget->SetVisibility(true);
            }

            else
            {
                InteractWidget->SetVisibility(false);
            }
        }
    }
}

guys how i can call this function only locally that this will be changing only for a player that stepped into this item?

[true stream]

oh, duh.

[blazing spruce]

Ooo im not sure what you mean, how do i do that? if I can avoid timelines I will cause making sure they correct for one another when health state is changed is a bit of a bitch! also even if FX are ran through the on rep, how would that then help towards making it visible to spectating players?

[blazing spruce]

When you say over time, are you talking with a timer or using tick or something?

[dark edge]

You can even forget the onrep

[modern cipher]

before calling it check if the player controller is local
IsLocalPlayerController()

[dark edge]

Tick / Timer -> map HP to SomeFloat -> Smooth SomeFloat -> drive visuals with it

For instance we have a float representing combat intensity which smoothly interpolates from 0.0 (nothing goin on) to 3.0 (active combat in a boss battle)

and another represnting danger or low hp, which goes 0-1

the 2 combined are used to drive dynamic music mixing

[round mist]

I'm running into a weird timeout issue in my live Steam game. If a player's hardware is lower and loading into a server takes too long, Steam times them out and it fails to connect.

Is there any way to increase the amount of time a client is allowed to connect to a server thanks to the map load time? Or is there another solution here I'm not thinking of (besides better optimizing my load times. I'm working on that as well)

[true stream]

Btw, tl;dr, I have a "board" that keeps track of all my units, and depending on the tile occupied X or Y should happen, that means that the board itself should probably be an actor spawned by the server and fully replicated?, or I can I keep it like a level instance.

[dark edge]

like in Stellaris? Where your fleets etc are on an outliner in the UI?

[noble sentinel]

Well its definitely called because bird is still dying for server player, even if client player kills the bird. But client player cant see birds ragdolling/animation change.

[true stream]

not super familiar with that game, but picture a chess game where the pieces move smoothly, and depending on their tile stuff happens.

[dark edge]

So like a background sim with actors as a view of it? Or are they just actors in 3d which move on a board in 3d?

[true stream]

second, actors move

enemy actors find each other in the same tile, an encounter (fight) happens

so Im thinking the whole board should be replicated as just another actor

[modern cipher]

in default engine ini file

[/Script/OnlineSubsystemUtils.IpNetDriver]
DefaultConnectionTimeout=30.0

that might be a quick fix but you need to see whats causing long loads

[dark edge]

Yeah the board can be the ONLY thing that's replicated if your system is set up right

[round mist]

Perfect bandaid until I can find a better solution. Thank you!

[dark edge]

Every visible actor can just be local, doing stuff based on the board state

[true stream]

right you say that because the board contains the actors

[dark edge]

Rather, the board contains the state the actors care about.

Is Chess the closest analogy to what you're making?

[true stream]

chess as in the actors (pieces and units) move in a way they occupy tiles depending on their position. Everything else is not like chess

and there is a board, there is that.

[dark edge]

Yeah you won't need to replicate the units at all possibly. Just the game state, in the GameState class. The entire thing can just be data in there if you wanted.

[true stream]

yeh Im already building it that way, setting it up so each "tile" is only data, which contains my entities (pieces or units)

but so far I have the standard spawnActor method for all of them

[true stream]

btw, Im spawning new actors constantly, its not like chess that you start with all the pieces.

[dark edge]

Yeah how to architect it is up to you, you could just as easily have some data like an array of units and some logic to spawn/despawn actors based on it

Might be simpler to just use replicated actors per unit though, really depends

[blazing spruce]

Interesting! How would I go about it in my case where I want it so nothing happens until the player is at half health, then at quarter health some PP fx happen, which then gets worse when in low health state, and all goes back to normal when the player heals (provided they're not in quarter or low health states)? would love to see some examples of how to set it up properly in the way you're talking about, find it harder to properly visualise how its set up

[dark edge]

map range clamped

Get it to output a float from 0 - MaxState based on hp

looks like 0-2 covers your bases

MapRangeClamped(HP/MaxHP, 0.5, 0, 0, 2)

that'll output a 0 at half hp, a 1 at 1/4 hp, and a 2 at 0 hp

then you can drive whatever with those

[still path]

Does updating a member variable in a replicated struct send the entire struct to clients or just the piece updated?

[fathom aspen]

Just the piece updated

[upbeat basin]

OnlineSessions and GameSessions are.. different things right?

[fossil spoke]

Where are you getting these terms from thats making you think they are different or the same?

[upbeat basin]

[2024.01.03-05.00.34:495][668]LogOnlineSession: Warning: OSS: Player Can-0EB13FF947C1298F5BD27E93C5E8193B is not part of session (GameSession)
[2024.01.03-05.00.34:495][668]LogOnlineSession: Warning: OSS: Player Can-0EB13FF947C1298F5BD27E93C5E8193B is not part of session (GameSession)

I mean, I want to say they are different things with different purposes. But getting these warning messages makes me think if they are the same thing or supposed to be used together

[fossil spoke]

In this case, "LogOnlineSession" which is what Im guessing your referring to when you mention "OnlineSession", is the OnlineSessionInterface.

https://github.com/EpicGames/UnrealEngine/blob/072300df18a94f18077ca20a14224b5d99fee872/Engine/Plugins/Online/OnlineSubsystemNull/Source/Private/OnlineSessionInterfaceNull.cpp#L973

So depending on how you want to interpret what youre saying.

[upbeat basin]

Ah, so GameSession is the name of my online session

[fossil spoke]

The answer to your question could be yes and no.

[upbeat basin]

Which is probably coming from NAME_GameSession macro, I believe

[fossil spoke]

Yes

You likely tried to unregister a player that wasnt registered to begin with

[upbeat basin]

I get this upon joining the session, sessionInterface->JoinSession(0, NAME_GameSession, result); this is how I tried to achieve it

Which returns EOnJoinSessionCompleteResult::Success though, so I'm a bit confused

[fossil spoke]

Try breakpointing through the code and try and understand the state the session and the player are in 🤷

[upbeat basin]

Well apparently it was casued by leaving the menu map, not exactly joining to the session. But changing the NAME_GameSession to something else makes the warning go away. I think I need to delve a bit deeper. Thanks for the pointer

[dusty void]

I'm having this issue with using IsLocallyControlled in my OnRep where it crashed the game when it's called (it's called at the beginning since i set the health variable in the beginning, the OnRep is called properly when I take away the LocallyControlled check and I never had this issue before, can anyone help? ill provide more of my code if necessary

So I put an Owner check just to see if that existed and it did, it's not registering it to be locallycontrolled tho, at least it's not crashing anymore

[fossil spoke]

@dusty void Always check your pointers before using them.

[dusty void]

Yeahhh, it wasn't an issue in my last project somehow, im redoing a project i was on in 5.3.2 just so i could get my defualt movements with the enhanced input system

[dusty void]

nvm my editor play settings was set as listen server and it was working for the client but not for the server, idk if that's supposed to be how it is buttttt

also forgot to put UMG in my build.cs file 🫠

Not sure about a few other things but everything at least works now

[dapper arrow]

I'm trying to do a multi sphere trace for objects on an AI during an attack, using the location of a component attached to the character's mesh. The idea is to apply damage when a player overlaps the sphere. However, I'm noticing the server and client are out of sync... the server doesn't seem to update the location beyond the first time it's called. Is there something off about calling this from a tick from an anim notify, or does the game not like updating positions that quickly?

... do I need to make sure the animation is playing on the server too?

[thin stratus]

@dapper arrow Is that a Listen Server or Dedicated?

[dapper arrow]

Listen server

[thin stratus]

Is the ListenServer looking at the Monster when it attacks?

In general, you will need to of course play the animation on everyone

Skeletal Mesh Components have a setting that controls when to update bones and tick poses, which is some drop down Enum which name I can't remember.
It's set to only do that when rendered iirc by default

That's why I'm asking if Dedi or Listen and if the Listen is seeing the enemy

[dapper arrow]

Hrmm interesting I'll look at the skeletla mesh settings. This is my current set up where an interface call happens to to the enemy, then it does an RPC up to the server then a multicast to do the animation

[thin stratus]

That should theoretically not work

The AI is server controlled and owned

The Server RPC should never make it

Unless there is something about this setup that I don't know

[dapper arrow]

I'm probably using the wrong terminology, this is being set down to the actor itself

and not the AI

[thin stratus]

It's a Character or not?

And it's controlled by an AIController of sorts or not?

[dapper arrow]

Yes it's a character with an AIController

[thin stratus]

Yeah then what I said still counts

You can't perform server RPCs on actors that aren't owned by the specific player that calls it

Also AI are server authoritative. So you shouldn't need to call anything from client side to begin with

The multicast is fine but the server rpc is wrong/redundant

This whole stuff should only be called by the server to begin eith

With*

If you for whatever reason need the client to tell the server the Montage, which I don't know why cause I don't know your game, then you need to do the Server RPC in the player's character, before calling the interface function

[dapper arrow]

I'm still in the early stages of figuring out how the networking works in unreal and where server authorities are, so that makes sense to cut out the RPC there as an unnecessary middle man and keep the multicast so the clients see the animation

this is supposed to really just be a basic, "enemy swings their arm and damages you if you're in the sphere trace"

[dark edge]

at a minimum that can just be:
Multicast playing the animation
Your HP should already be replicated

Of course it can get more complex if you want hit effects and not just "number go down"

but start there

[dapper arrow]

Yeah this is just a super basic "you get hit number goes down"

I've got the play montage, then a notify state in the montage that has an event tick to send an interface message to the character enemy to perform a sphere trace

in this case here the client prints out a loc that continuously updates but the server's print doesn't

even with these changes:

Hrm well it looks like getting rid of the RPC and setting the testing to be 2 players with a listen server instead of 2 with a client got it working, so I'm going to chalk it up to a combination of those two things. Thanks for the help!

[dark edge]

You said previously you were testing with listen?

You need to opt in to updating bones on dedicated

[dapper arrow]

Ahhh that explains it, my plan is to have there be a listen server on here and not dedicated. I go back and forth between testing with a listen or a dedicated, didn't realize there were more issues between the two

out of curiosity how do you opt in to updating bones on dedicated?

(I'm only a week in to trying to translate single player unreal stuff over a few years to multiplayer)

[dark edge]

Option on the skelmesh I'm pretty sure, just search for refresh bones or something like that

[dapper arrow]

Sounds good, thanks!

[dark parcel]

Where in player controller can I run something but with condition that the object is already replicated?

I want to run something on client after the server already replicate the variables

Or if I can re-word it, when is it safe to run a function when a player joins?

thingking about BeginPlayingState? but I am just guessing at this point

[dark parcel]

maybe postLogin?

[latent heart]

There is no "safe" time. Stuff is replicated at random times. You need to set up a system of checks.

[glacial zealot]

https://blueprintue.com/blueprint/kr3jt5k7/

I cant understand why it seems to run on owning client but still only the look works moving and jumping doesnt, even thought seems not to be replicated, dont know how to do it

[glacial zealot]

Somehow I found out that my character BeginPlay runs only on server instead of each client

[keen thorn]

Hi, anyone here adept at how Unreal character movement works? From the docs it seems like the server does not tick and only replay the received moves to check if it's correct. Neither the server nor client use fixed timestep. And the server does some magic with estimating deltatime since it cant use client's timestamp directly. My confusion is how can it estimate the deltatime correctly? Wont this cause the server and client be out of sync all the time since deltatime is never exact. Whats the reasoning behind this instead of fixed timestep solution (cus then server can assume client update at 60hz and can step the simulation to be in sync)?

[dark parcel]

Hmm so OnpostLogin is not reliable too... there is no valid controlled pawn yet at the time it's called

@keen thorn https://www.youtube.com/watch?v=urkLwpnAjO0&list=PLXJlkahwiwPmeABEhjwIALvxRSZkzoQpk&ab_channel=delgoodie

[bright summit]

can't get this to run only on client which is touching the water. What I noticed only setting water volume is happening on every player - don't know why. When I manually set movement mode to flying for e.x. it works perfectly. How to set water volume only for individual players. Or it is not possible?

[keen thorn]

This does not answer my question. The guy posted on reddit a while regarding a desync issue caused by server and client deltatime dont match. He did a workaround but still not explain where the server timestamps came from

[noble sentinel]

Sorry for pinging but can you explain this? I mean damage is working serverside but run on server command in bird actor isnt working serverside nor multicasting. I tried it with every variant.

[keen thorn]

The core issue is i dont get how the server can sync with client or vice versa

[dark parcel]

I don't think it's the server that sync with client, server is authority. There will always be small desync even in almost perfect network but if it isn't much, you won't really notice it.
When the difference is too big, server will correct client position because server is authority thus the rubber band. I might not catch your question fully, totally new to this my self.
Hopefully someone wise have answer

[keen thorn]

Thanks i know what u mean, and i also know all this, i just dont know why it was done this way while alot of this would be simplified using fixed timestep update with a timebank

And i also wanna know the technique used to keep the deltatime in sync

[noble sentinel]

How can I run this hide bone node for clients? Client can still see bones in server

[dark parcel]

make the component, only owner see?

don't even need RPC or multiplayer concept to hide the FPS mesh

[noble sentinel]

I will hide the arms but gun mesh will be visible, gun and arms are merged

So Im using a full FPS arms for first person and its only owner see, but other fps hands bones are invisible and only gun visible, which is attached to a full character models hand

[dark parcel]

doesn't look invisible to me 0o, I mean what you hightlight should be set to only owner see

[noble sentinel]

If I make it only owner see, gun will also be invisible

As I said, gun and arms are merged skeletal mesh with animations...

[dark parcel]

the gun shouldn't be the same component imo

[noble sentinel]

Well I know that but Im not a good animator or modeller so Im using a free FPS arms model from sketchfab so

[dark parcel]

I don't do fps but I think even in the FPS template, you have 1st person Weapon and 3rd person weapon

you basically need two arms FP and TP and 2 weapons FP and TP

[noble sentinel]

Im already doing that

problem is, to show the weapon of one fps arm, I should hide arm bones but weapon bone should be visible

[dark parcel]

I'm seeing 3 arms

[noble sentinel]

Lemme tell you all meshes

Body in back is a full character named FPSBody, only owner see with arm bones are hidden so player can see FPS arms and that body

FPS Arms is only owner see arms with gun

"Gun" is again an FPS arm but arm meshes are hidden and gun is attached to wrist bone of "mesh", its owner no see

"Mesh" is TPS character people see which is owner no see

So there is 2 characters and 2 fps arms

[dark parcel]

hmm can't help you here, kinda got confused. I don't think RPC gonna fix your problem though, especially if you have late joiners. It should just be a matter of ticking what owners can or can't see.
but if that route doesn't help then I am not sure what you can try

[noble sentinel]

Well I will probably open arm model in blender and remove everything but gun lol

Im not using animations for it anyways

[dark parcel]

If that arms comes with a gun and you only want to show gun, totally just get rid off it

deleting the polygon or if you don't care about performance just use a transparent material on the arm

[dark parcel]

Any reason to not use static mesh then?

a pistol that doesn't slide feels kinda dead tho 😛

[noble sentinel]

Wait, I forgor I can use transparent material on arm

💀

My hours...

[dark parcel]

throwing it to 3d program and deleting the polygon doesn't take long either

transparent material is kinda heavy but for small game, probably don't matter

[noble sentinel]

Is masked materials heavier than normal ones?

Thank you very much for help btw

[dark parcel]

Yeah, if you hit F2 or something in pie, you can see material complexity. Anything transparent is always red

[noble sentinel]

I guess it wont do anything bad just for an arm model right?

[dark parcel]

I wouldn't worry about it. Can always delete the polygon later

[crisp shard]

moved my issue to: #materials although, it is in a mutliplayer setting, but not exactly the issue im having

[true stream]

if spawning replicated actors should happen on servers, does it mean that destroying actors also should only be executed on servers then they would be destroyed automatically on clients?

[crisp shard]

in short, yes

[chrome bay]

Generally speaking, you only want to destroy something you have authority over.

[true stream]

Right, trying to wrap my head aroudn what principle replication as a whole makes sense to apply

[chrome bay]

There's not a completely strict one-size-fits-all answer because it sort of depends on the usage of the actor, but for 99% of the time this is the rule

[true stream]

btw, can I keep in sync 2 actors even if the original spawning of the actor wasnt triggered by the server?

[chrome bay]

For example an actor might have been spawned by the Server, replicated, but later torn off. In that case if the Server calls Destroy(), clients won't clean it up

Not really no

Well, you can spawn actors with deterministic names independently, and fool the engine into thinking they are network addressable to sync them together.

[true stream]

Right, Im building something like a RTS game, but simpler, and I have actors that spawn other actors, while at the same time having an array that keeps track of everything and should be in sync somehow, and Im getting into some shady problems.

so if I destroy an actor but the array needs to know, in both server and client, does it mean I should probably let the server take care of that too?

trying to understand what to delegate to the server and what could run on clients

so, for example, every frame my units move, should the position be replicated too?

those are the little things that complicate things

at least for me

[chrome bay]

If any of that is spawned client-side, then the Server can't destroy anything authoritatively

[true stream]

no, every actor is spawned by the server

but how they move so far is client

but recently I've found a problem where I was disposing (remove from arrays, do other stuff, destroy actor) and it was happening on both server and client

and I was getting errors because the client was trying to access something pending garbage collection

so it made me reconsider some things

[chrome bay]

Sounds like you were destroying the actors client-side not server-side (or both), but not really sure

[true stream]

yeah, both.

so I should probably in my case.. do something like, when the actor is destroyed then do the stuff.

[chrome bay]

Yeah, thats the issue then - the client is destroying a replicated actor. The client then receives an update about a replicated actor which no longer exists locally, hence the ensure

[true stream]

so basically on clients (and listen server) listen to the actor destruction, and go from there? or its too late by then

[dark parcel]

OnPostLogin doesn't guarantee that the controller posses a pawn yet. Should I just run my logic in the pawn's begin play?

[chrome bay]

If the actor is replicated from the Server, the Server is responsible for destroying it. If the Client destroys a replicated actor they don't have authority over, the engine will panic.

[true stream]

Right, what I mean is, if I need to do stuff before the actor gets destroyed (removing it from arrays, etc) how does the client do that

[quasi tide]

AcknowledgePossession in the controller is a client RPC that gets called by the server

[dark parcel]

ty ty

[chrome bay]

They could listen for the OnDestroyed callback if they need to respond to it somehow

[true stream]

you mean the destroyed event right?

[chrome bay]

yeah

[quasi tide]

Could also do something in onposession in the pawn. But that is server side only I believe. I can't remember the pawn specifics. I just do my setup stuff in the acknowledgepossession function

[true stream]

at that point the actor is still intact?

I mean I can do things with it

[chrome bay]

Yeah, it fires before the actor is actually destroyed

Limited things yes

[true stream]

ah ok, then I will use that

btw, actors that are destroyed dont get automatically deleted from arrays right? I need to manually remove them otherwise I would have a null pointer there

[dark parcel]

Basically I need to tell new player that joins to send their data (Cosmetics and the like)
I guess I could do OnPosses -> Get Controller -> Run a client RPC that does a server RPC? 😄

gonna look at acknowledge possession

[quasi tide]

I did this in the acknowledgepossession function

[chrome bay]

ItDepends(TM) - but generally speaking the array value will either be null or garbage

[quasi tide]

And inside of that just do a server rpc

[dark parcel]

cheers mate! put me back on track

[true stream]

and I guess putting a "isValid" before each instance of access is garbage code.

[chrome bay]

The engine will only 'null' it when the object is fully destroyed, if it's a UPROPERTY and if you don't have the pending kill disabled.

Otherwise, it'll just be garbage essentially

If pending kill is disabled and you don't clean it up yourself, it'll never be GC'd AFAIK

[chrome bay]

Not at all - IsValid() is probably preferable most of the time if you don't control the objects lifetime

[quasi tide]

You have to null out the references yourself and then it'll be GC'd

[chrome bay]

^ Yeah this, if PendingKill = disabled

If PendingKill is enabled, the engine will GC it anyway, then set any UPROPERTY references to it to null

I'm not sure what the default is anymore

[quasi tide]

Default is still the traditional one.

[true stream]

so far Im using BP only, is any of that applicable ?

[quasi tide]

Allegedly the pendingkill=0 is supposed to become the default in the future.

[chrome bay]

SInce we're dealing with Arrays in this case, you have to remove the entry yourself regardless

(unless you want the entries to be null)

[true stream]

Right, the problem I had I guess was that in che client my entity was valid, then the server put it to null pending kill

so my removal method did nothing because couldnt find it

something like that

fun stuff

[dark parcel]

@quasi tide ```cpp
UFUNCTION(reliable, server, WithValidation)
void ServerAcknowledgePossession(class APawn* P);

There is also this, I guess I can use this for the Listen server pawn?

[chrome bay]

Yeah, BP makes it less easy because any 'pending kill' object is just considered null essentially. In CPP you can still compare the 'dead' object pointer

[dark parcel]

actually client RPC will work on listen server too right 🤔 . Sorry to bombard with questions, I am just about to start doing MP stuff

[chrome bay]

But the actor destroy event should fire before the actor actually gets marked as garbage

[cobalt pollen]

Just went through Cedric's C++ session management and got to the point where I'd need to work my butt off to expose the session search results to Blueprints, back to advanced sessions plugin for me but I'm glad I went through it so I know what's going on under the hood 😅

[true stream]

does it happen on the same frame?

meaning, the order in which I check matters

[chrome bay]

it happens immediatelly after the event is broadcast

[nimble ibex]

Hello! Im trying to implement multiplayer for the first time, the camera is ticked replicated but its only showing correctly on the client (right side) not the server (left side) it shows up correctly for a split second when i run the project but then just goes to what you see now. Thanks guys!

even if i set the camera rotation onbeginplay or on tick it just goes back to that same view after a split second

in standalone it works fine

[dark edge]

what IS the camera? First off, how is each player getting their pawn?

[nimble ibex]

gamemode default pawn class is the intended pawn, then ive put playerstart in level editor. is that what you mean

the camera is a camera component in the pawn

[waxen harbor]

Hey everyone! So I've got what I'm hoping to be a relatively straightforward replication problem (for those with more replication experience than me) that I'm having a tough time figuring out.

My situation is this:

• There's only ever two players in a session. One is the server (client-server?) that hosts the session, and the other is the client that joins the session.
• Each player has a floating UI (Tablet), which is an actor that follows each player and is set to replicate, but OnlyRelevantToOwner. This actor is supposed to be spawned when hosting/joining a session so that each user can control world properties. This UI controls a lot of functionality in the game, and it uses a widget component, so I don't even want to bother trying to replicate that to other players.
• I've created a "dummy" version of this UI actor (DummyTablet), which is really just a mesh of the UI without any real functionality. The intent of this DummyTablet is for other clients to see where other clients' UIs are, without all of the complexity of actually replicating each client's UI. This DummyTablet actor is currently not set to replicate.

Where I'm at:

• Currently, the session host can see joined client's dummy tablet (and updating transforms) just fine, but the client can't see the host's dummy tablet anywhere. Both the host and client can see their respective Tablet UIs fine as well.

I've attached an image of the current state of the key blueprints for the Tablet UI/DummyTablet UI logic, so hopefully that will help explain exactly what I'm doing at the moment.

[dark edge]

First thing to check is that server player is getting a pawn, it looks like they don't have one.

how many player starts?

[nimble ibex]

the pawns all spawn

ive tried 2 and 3 they spawn

[dark edge]

Show your pawn's code and components

camera stuff will not need to be replicated though, should just work locally

[nimble ibex]

youre right i didnt even think about that haha

i will send that now

[final holly]

Guyz In multiplayer how can i focus a Actor's Widget component . So I mean how widget component gets inputs from that player only interacted (or focus ) itself.

[nimble ibex]

Thank you

[dark edge]

oh no

get player controller 0

[nimble ibex]

oh i should get the player controller relevent to the player

[dark edge]

I'd start by disconnecting all that and making sure the client and server see the same thing

just disconnect the 2 events

make sure they're all happy and looking through their own cameras

[nimble ibex]

would get controller (self) work as an alternative to get player controller?

[nimble ibex]

yeah will do now

[dark edge]

Yeah you did that correctly for the input stuff on begin play

[nimble ibex]

its the same when i unplug it

[dark edge]

Then fix that, figure out why your camera isn't being used

you shouldn't have to tweak anything, just add a camera and adjust its position

Is it not being used or is its position not being updated?

[nimble ibex]

when i play it standalone the camera is as i inteded, what would change it when changing to multiplayer

[dark edge]

did you disconnect your begin play and input action events?

[nimble ibex]

yeah

[dark edge]

Delete camera component and readd, test play, do both screens see the same thing?

adjusted by player start spot location of course

[nimble ibex]

no its still doing the same time, the whole time the server has got the camera right for a split second on start then changed

the same thing*

[dark edge]

Make a brand new pawn with just a camera and test with that

Something is fucky there

[nimble ibex]

it works with the new pawn. I guess i can just remake my player that might wokr

[dark edge]

yeah you got something borked

[nimble ibex]

thank you for your help mate

just copied and pasted only my components and its not working; so its something to do with them.

it works but only very high up

but my previous pawn (even with all the code unhooked) does not work. Im confused

[scarlet seal]

Hey guys, Im looking for some advice. Im trying to figure out how you do a pubg/fortnite style lobby/server setup.
The way I see it in my head is your lobby is a listen server that people join thru your friends list (I have this working with EOS) then when everyone readies you travel to the dedicated server.
First, is this the correct way to do it?

Second, if so, how do you communicate with the dedicated server that there is a team coming in and these players are on that team?
Do you do that thu playfab/aws? Is there a way to query the dedicated server before joining, getting a team ID to assign the players?
Its difficult to google this as it always just return info on how to setup a dedicated server (which I also already have working)
Any and all input would be appreciated 😄

[quasi tide]

Not even. Connect to a dedicated server, when X players are ready, teleport everyone into the bus/plane/way your game has them enter the actual map. Profit.

[dark edge]

How to not split up team when it joins?

party/group

[quasi tide]

In UE land, beacons.

I was reading the "lobby" part as the pre-game area where people are just running around goofin' off.

Not the menu part.

But yeah, beacons

[nimble ibex]

It works sometimes? why is this happening? thanks guys

[dark edge]

Where is your camera at spawn?

Is the side view the default camera transform or some broken thing?

[nimble ibex]

some broken thing

the camera is in the pawn its default top down like you see when it works

[scarlet seal]

Arnt beacons non visual? Everything I have seen from beacons is just menu stuff

[quasi tide]

It's how you keep teams together

Pretty sure there is a pinned resource here

[prisma snow]

Hi! I am working once again in multiplayer (yey ), and I am experiencing the beautiful world of race conditions on actor initialization - Basically some of our actors (placed on the map) depend on certain other actors (such as controllers etc) to exist (and be replicated) on their BeginPlay functions.

I've read something about controlling when the game starts using game mode or something like that, but not sure if it's the best approach.

Other options I am considering is using a timer to delay the execution of certain functions, but it's not ideal because if the timer ends too soon, we'll have the same crashes, or maybe not using begin play at all and call some substitute function manually. Ideas, recommendations?

[violet jay]

Hello everyone I am coming from the #cpp chat. Two users from over there were helping me but they recommended I come here for my question. I am trying to follow Lyra's design pattern. But I am also trying to do a grid based inventory. I am using a fast array serializer to keep track of inventory entries. They hold a pointer to a replicated Uobject iteminstance and then some other data about position, rotation, and count. When the client receives new members from the fast array I instantiate a local array of uobjects for each fast array item because I need them as an array of pointers. Is this a good design decision? It feels weird to have two arrays of the same data basically. I will attach my code too rn

Here is my conversation from the other chat too: #cpp message

So what I'm asking basically is it weird to instantiate a UHInventoryEntryWrapper for every FHInventoryEntry fast array item that the client receives?

[bright tiger]

What is the different between using a Multicast system to spawn bullets (projectiles) on each client against spawning the projectile in the server and replicating such actor to all clients copying its movement?

Moreover, in this simple projectile setup (image): What do I have to replicate? The base actor and all components or only a part of them?

[sinful tree]

You're spawning separate instances when multicasting that typically couldn't be referenced over the network without some additional code by making the separate actors net addressable. This is an issue as the server may detect that the projectile hit something and destroy it, but that doesn't mean each client that has their own projectile spawned would detect that same hit and destroy it.

[nimble ibex]

Can someone tell me why this isnt working please. On the client it says the hit mouse is giving accurate x,y coordinates but when i click it it just goes to 0,0

[thorn turtle]

So I've got 2 issues currently, something about replication I guess but after reading through the documents I'm not really understanding

1. Animations, I have some animations that I added into a blendspace with a bool that is activated to cause the animation, however it only plays on the screen of the player holding it AND it shows the same animation on all characters
2. Its probably a bool again but I have a function to toggle the visability of a spotlight on and off for a flashlight, it does play from the host but not from any clients, none of the different ways I've been trying to get it to work makes it work on the clients
   I'm guessing there is something I'm missing on how to replicate over variables

[nimble ibex]

On the details on the variavle have you put replication to RepNotify

[bright tiger]

Is there a way to “connect” a server object with a client object that were spawned by their own? For example the multicast bullet example but by picking instances from an object pool that each client has.

So the risk of multicast is getting out of sync in clients?

[thorn turtle]

So once I've set them to RepNotify is there anything I do, I've not done RepNotify for anything yet so I don't have anything set up for it in general.
I did just test it and its doing the same thing as it was

[sinful tree]

Event Tick fires on server and clients.
What you're effectively doing here is having every client set their own value as they'd be getting their own player controller and getting the hit result, but then the server is also running that for the first player controller it knows about and setting the hit result which would replicate and do whatever.

Additionally, the hit result for the mouse cursor can only be captured client side. You'd need to send an RPC to the server with the hit result from the client then have the server set the variable with that result, then the OnRep should be able to do its thing.

I would also recommend against replicating the entire hit result on tick if all you need is the location.

[sinful tree]

You can look into how to make actors net addressable and that'll show you what is needed to at least make them referenced across the network - If I remember right, it'll require C++ to do. As far as synchronizing them, that's additional work too.
It's not so much a "risk" as even when you spawn a replicated actor they are not entirely synchronized on clients - there is always some latency in multiplayer games. Multicast just means you're having each client run the code separately, and in certain cirumstances that isn't what you actually want to be doing.

[nimble ibex]

I want all the clients to have their own values. But at the moment it doesnt move the compent to the clints hit value it moves it to the origin, which is the servers hit value when im on the client so that might be why. Also might not. Have you got any ways to make it wokr

work

i forgot to include this part

I had to run on owning client. Thanks!

[sinful tree]

Inputs only run on the client to begin with. If you want others to know the hit result of that click, you'd have to run on the server sending along the hit result that the client generates.

Click > Get Hit result > Send Server RPC > Server Sets Value > OnRep Fires clients can do what they want with the OnRep'd value.

If it's just a one off thing that you don't necessarily need to store a variable for:
Click > Get Hit Result > Send Server RPC > Server Multicasts the value to everyone > Clients that receive the mutlicast do what is needed with the mutlicasted value.

[nimble ibex]

Does (static mesh) component movement not automatically replicate when component replicates is ticked in bp details?

[nimble ibex]

this was so the clients could control their own components but its still not replicating.

[nimble ibex]

which of these steps am i missing; looking at my code?

[bright tiger]

Hello again!

I’m reading about it but still not getting it.

What is the process for creating an object pool inside a multiplayer environment? The only idea that comes to my mind is to share the exact same actor (object memory actor) between all clients so that everyone pick and return the same actors to the object pool. But then… what with array replication?

As soon as I want to desync that I get messed.

[sinful tree]

Currently all you've shown is that you're getting a hit result on tick which is attempting to get the local player controller on all instances of the actor and setting the HIt Mouse value, then you've shown a click that is calling a server RPC that then calls the "Clickk" function.

So you have a click.... you're sending a server RPC but you're not sending the hit result to the server through that RPC, and then you're attempting to use the hit result in the Clickk function.

[sinful tree]

All that is really required to make something net addressable is to make sure that it is deterministically named the same thing on all machines (if you're spawning them in a loop it should be fairly easy) and then calling SetNetAddressable() on them.

[nimble ibex]

But why arent the hit results going to the server? sorry i dont get it could you have a look at the code ive got quickly

each client works individually but the movement doesnt replicate

[sinful tree]

As I've said... Event tick fires on all clients and the server.

But only the owning client actually can get the hit result.

The server overrides the value set by the clients.

The server doesn't necessarily have the hit result.

Use the click event to send the hit result in through the RPC.

[nimble ibex]

and is there a way to exclude the server from setting those variables

[sinful tree]

You don't need to be getting the hit result on tick.

[nimble ibex]

ok il try thanks

but by the way, the input action im using is 'triggered' which acts on tick, wont this have the same issue

[sinful tree]

No because it's not tick and it only fires on the client performing the click.

[nimble ibex]

tried to put here instead but didnt work

[sinful tree]

Click > Send RPC with Hit Result > Server Sets Value

[nimble ibex]

what are the nodes for that called. where do i put that. i dont understand sorry

[sinful tree]

You're using a click event already.
You already know how to get a hit result.
You know how to create a server RPC (an event marked to send to server). You add an input to that event to pass along the hits result like you would add an input to a function.
You know how to set a variable.

[true stream]

when the server destroys an actor, and consequently the client's actor also gets destroyed and doesn't pass the isValid check, can I then put it into an array or what kind of actions can I do with that object?

[sinful tree]

If it's not valid on the client (or server for that matter) you can't do anything with it.

[true stream]

it did allow me to remove it from the array it was originally in

but I guess thats it?

[sinful tree]

If the reference wasn't valid then no, you didn't. If it's not valid that means it's not referencing anything.

[true stream]

I checked and my array indeed stop printing that it had an invalid object inside

only after removal

if I didnt do that it continues to exist inside the array indefinitely for what I see

[sinful tree]

All that does is remove the first instance of a nullptr from the array. It doesn't mean you're referencing the actual object.

[true stream]

I see, so in this case where the server kills the actor and the clients reacts to it, what would be a good way of handling it?

since both server and client have the reference inside arrays and do stuff.

[sinful tree]

You can bind to the reference's On Destroyed dispatcher and when that triggers use it to remove it from whatever arrays - it should still be valid at that point.

[true stream]

Problem with that I guess is that I might end up removing it in the middle of an array loop, causing all sort of problems.

usually what I do is to add it to a secondary array, then loop that one.

do I have time for that?

[sinful tree]

It's unlikely to be a problem. Most things can be thought of being executed instantly, including loops.

And it wouldn't matter anyway - if you have an invalid pointer, you shouldn't be using it within the loop.

[true stream]

do things like timers get deleted when the actor referencing them is destroyed?

[sinful tree]

I'm not 100% on this one, but I'm fairly certain that is the case.

[true stream]

so I might clear the timers just in case on destroyed too.

not sure about events I listen to, probably the same

[nimble ibex]

@sinful tree i tried to do what you said. It hasnt worked. Ive tried the set variable functions other places too. if i put just the code inside the function it works, just doest replicate. if i use the function it doesnt work at all

I have got the function to work but still it does not replicate

[bright tiger]

So setting the same name would sync the server and clients actors in the next replicated variable values?

[sinful tree]

(Ideally you'd probably create a custom structure to contain both the hit location and hit component so they get their onrep fired at the same time)

[sinful tree]

No. Having matched names and calling SetNetAddressable() is what should link it up, and yes, once that link is established, any replicated values should be sent down from the server.

[bright tiger]

And something else, when you mean "matched names" you mean object name or any id? Is there a specific method for it?

[sinful tree]

Object name itself - so like how it displays in the Outliner.

BP_Bullet0
BP_Bullet1
etc...

[bright tiger]

Oh I see.

Thank you so much for all this help 😢

[cobalt pollen]

Unrelated but this screenshot made me realize there are settings for the BP graph lines I want to set now...

[nimble ibex]

When I run on owning client or multicast it works there is no replication. when i run on server it replicates but uses the servers cursor location. is there any way to make it use the clients cursor location

[sinful tree]

What I've sent should take the client making the click's cursor location and send it to the server and the server is then setting the value which replicates it to others.
If you're calling a "Run On Owning Client" or "Multicast" immediately after setting the values, there is no guarantee that the replicated values have been received on clients by the time these events are called, and that's typically why you use OnReps as it avoids that problem. If you just want to pass it along in the run on owning client or multicast without setting a value, that's fine to do as well.

[nimble ibex]

This is how ive included that. But still when i click it says the location on server is 0,0,0

[glacial zealot]

Hey I’ve tried some multiplayer setup, found a way to make an equipping and equippable input system but im not sure its the right way… anyone can tell me if its fine design side since its SEEMS to work?

I've created a weapon equip system where I have two different classes, one for the first-person weapon (owning client) and one for the third-person weapon(what others see). When I equip a weapon, it triggers a RepNotify equippedWeapon variable that calls an event. This event checks if character's locally controlled, spawns the first-person weapon (which has no logic but is visual), then checks if it has authority. If it has authority, it calls a multicast to spawn the third-person weapon. The third-person weapon class is not visible to the owner through 'owner no see.' In the same multicast, it checks if the character it's locally controlled, and if so, it activates inputs on the weapon, binding the fire events to the player's left-click event dispatcher. Is what I've done correct?

I've also noticed that with this setup, if I set the third-person weapon class to replicate, the inputs no longer work on the clients but only on the server.

[nimble ibex]

Ok you were right thank you so much!

[lucid badger]

I'm a bit confused by this interface, it sounds to me from descriptions, like Standalone and Listen Server do the same thing? But rationally and from testing it seems that Standalone causes you to open multiple, separate (not networked together) instances of the game?

https://cedric-neukirchen.net/docs/multiplayer-compendium/start-multiplayer-game

This page is one of the sources that makes it sound like Standalone is still networked

[latent heart]

It isn't.

[lucid badger]

Okay, thank you!

That makes everything that is happening make sense 😛

When I try in Standalone I Just get two wholly separate copies of the game where nothing syncs, that work fine. When I do Listen Server I get a crash that is consistent with my code not being written correctly for multiplayer, which makes sense 😛

Is Pawn BeginPlay too early to access Pawn's PlayerState on Client? It works fine on Server but I get nullptr on Client

[latent heart]

Objects can seemingly be replicated in random orders.

You can't rely on another object existing in teh begin play of any other object.

Networking, go

[lucid badger]

so perhaps OnPosssessed is appropriate?

[latent heart]

What you can do is when each relevant object begins play, you check if each other relevant object exists. If it has, you do x. If it doesn't, you do nothing.

For a pawn and player state, you'd have to have them both check for each other and trigger the same specific method when they both exist.