multiplayer

[fallen fossil]

not movement

[tardy fossil]

Current player still gets the updates from server, but it uses them to verify position instead

[fallen fossil]

I meant only sinlge rpc

its not broadcasted back

so I kinad have to upadte it locally

or implement another function that executes specificly on server and then sends data back to all Pawns

[tardy fossil]

Yea that’s a confusing way to put it., cause they do receive the replicated update they just don’t use it

[fallen fossil]

ah I see

RPC + Local updates should be fine. Since I don't need server to verify stuff 🤔

altho I need to get to know how predicting works

[tardy fossil]

just btw doing prediction when the tick rate isn't fixed makes everything 100x harder lol

one of the reasons CMC is so complex is cause it cause to deal with varying tick rates

[subtle gulch]

I've been working on implementing Steam Dedicated Server and MatchMaking Sessions (P2P). I'm trying to call some functions from the GameSession class from the Client when searching for sessions, however am i correct in thinking that it will not work because the GameSession Class does not exist / run on the client?

[kindred widget]

The client isn't a client when it's searching for sessions. It should be in the main menu as it's own singleplayer instance.

[subtle gulch]

Yeah thats how im trying to do it

It keeps getting a null ptr when checking game session, (child of game session)

BaseGameMode = World->GetAuthGameMode();
    if (BaseGameMode)
    {
        UE_LOG(LogTemp, Warning, TEXT("MainMenu: MenuSetup: Casting Game Mode Base!"));

        TUEGameMode = Cast<ATUEGameMode>(BaseGameMode);

        if (TUEGameMode)
        {
            UE_LOG(LogTemp, Warning, TEXT("MainMenu: MenuSetup: Casting Game Mode Session!"));

            TUEGameSession = Cast<ATUEGameSession>(TUEGameMode->GameSession);

            if (TUEGameSession)
            {
                UE_LOG(LogTemp, Warning, TEXT("MainMenu: MenuSetup: TUEGameSession Is Valid."));

                TUEGameSession->MultiplayerOnCreateSessionComplete.AddDynamic(this, &ThisClass::OnCreateSession);
                TUEGameSession->MultiplayerOnFindSessionsComplete.AddUObject(this, &ThisClass::OnFindSessions);
                TUEGameSession->MultiplayerOnJoinSessionComplete.AddUObject(this, &ThisClass::OnJoinSession);
            TUEGameSession->MultiplayerOnDestroySessionComplete.AddDynamic(this, &ThisClass::OnDestroySession);
            TUEGameSession->MultiplayerOnStartSessionComplete.AddDynamic(this, &ThisClass::OnStartSession);
            }
        }
    }
}

In the GameMode im doing:

ATUEGameMode::ATUEGameMode()
{
    GameSessionClass = GetGameSessionClass();
}

TSubclassOf<AGameSession> ATUEGameMode::GetGameSessionClass() const
{
    return ATUEGameSession::StaticClass();
}

[frigid meteor]

Hello people, so I am running into an issue with the Unreal Engine itself, and it's priorities when it comes to replication for multiplayer.

Basically; The engine stops replicating the Playerstate for the client if the client loads too fast compared to the host.

The issue is described here in more details; https://forums.unrealengine.com/t/player-state-not-valid-after-servertravel/473321

I have spent countless hours trying to figure out a way to solve this problem, but having tried several fixes, nothing seems to fix the problem. Anyone have any ideas as to how I can go about trying to fix this problem?

[sonic obsidian]

Does calling a server RPC on the server invoke it the same frame or later and is there any overhead to calling it when already on the server compared to a normal function call wondering about network overhead not so much cpu perf.
In other words should i check if im already on the server and instead of calling the RPC just run the code the RPC invokes.

[snow trail]

hello, quick question, does ownership determine network roles for a replicated actor?
im trying to have an actor be replicated with server authority but occasionally switch to client authority when needed, am i on the right track?

[chrome bay]

It's considerably simpler to just call it

And no there is no network overhead

And yes it will call immediatelly like a regular function call

[sonic obsidian]

oh sweet thats good to know thanks

[thin stratus]

Man there is a post in there that says that you don't need CopyProperties when seamless traveling. That's just wrong lol. So much false info everywhere

[remote tusk]

Here my debugging sessions are going. I call ServerInteract in my host when i click E, and it is printed in both host and client? Why is the reason? I only send it to server, so how the other client is seeing this print debug? What might be I am doing wrong?

Here is a video of me trying.. On the client, nothing will happen

[sinful tree]

Server: <print> indicates it was the server printing it. Client#: <print> indicates it was a client printing it.

even if you see it on both windows, it still means it was either the server or a client printing it.

[remote tusk]

The print is both seen in clients, but if i try to change "stone" material, it wont be synced because of normally its not multicasted or rep notified

[remote tusk]

Hmm. so it doesnt mean that it is replicated right? I thought it was replicated on the second client for a moment..

Because i only call RunOnServer RPC, from host, didnt do any client distribution inside the interactable for example.

[sinful tree]

Prints aren't replicated.

[remote tusk]

I couldnt understand why its printed on **both **actually. I only call it on the server

[sinful tree]

Because you're testing in the editor and it's likely running under one process. Know that if you see Server: <print> that means the print was triggered on the server, and only the server, regardless of what window it appears on. Same with Client#: <print> ... You may see it appear on multiple windows, but the the differentiator is the fact that you either see Server: or Client#: to denote where the print was actually triggered.

[remote tusk]

Is this about ownership or smth? Since I have 2 instance in the client, it is printing for both or idk

[remote tusk]

Hmm, thank you!

I was very confused for a moment why my other client can see the print! 😄 Was going to remove all my knowledge about RPC's and check them all again

Its all synced now, I did it with multicasting, but dont worry, i already understood what are the "caveats" of MC's. So i will go on try RepNotify now. <3,

[remote tusk]

Hmm, when i try to print text while playing with second client (not host), where was no prints. I think its only printed on server side like you said if no replication

[sinful tree]

Which probably means you're not reaching the server.

[remote tusk]

For in best practise, lets assume i am changing color of the stone, which i want to be persistent, i will go for "RepNotify". But what type of variable i should create for that? Bool? So that i can test like, changedColor or smth, or directly state of itself, what guideline i should follow for cases like that?

In Unity, NetworkVariable<bool> isColorChanged, would return "bool newValue" as return,
like
isColorChanged.OnValueChanged += () => (x) SetColor(x);
But as i understood in OnRep_ChangedColor, it doesnt return any new value or smth. Can i just use my variable ChangedColor to get updated version of it?

So something like that.

Another test i made is, This Event Interact is called on Run On Server, So i tried to scale it down a bit on the server. If i do that inside host, it works. But if I do that on client, I waited a result that it would "scale" on the "host" since it is executed on the server, but neither on host or client had the change of scale.

[thin stratus]

The state you wish to replicate. The actual value of it.

If you only have 2 colors that are predefined, then the boolean would be fine.

If the color can be "whatever", then it should be the color itself.

[thin stratus]

Yeah, the Variable that is linked to the OnRep has your value.

[remote tusk]

Aha, gotcha.

[thin stratus]

In C++ you can add the old value as a param to the OnRep

[remote tusk]

This seems like not working on the client. If I interact on the host, it will be replicated to host and client, but if i interact on the client, its not changing the color neither on both.

[thin stratus]

ActorScale might be replicated by default. Like internally. Not sure what you mean with "do that on client".

[thin stratus]

Then your Interact stuff has a problem.

[thin stratus]

Make sure to put some print strings up

[thin stratus]

What is "GetInteractable"? How does the Server get that?

Does that even return a valid value when you do this via the Client with a ServerRPC?

And the ClientRPC at the end is kinda redundant. Whatever you are doing there could just be done locally before/after the ServerRPC.

[remote tusk]

GetInteractable is a method that returns last element of my "Interactables in Range", I set it inside Overlap on the client

I thought that would cause an issue. But i can see why it might not work like you said. We are sending the event to server, but server not be knowing Get Active Interactable?

[thin stratus]

Please start debugging this a bit with PrintStrings.

[thin stratus]

Eh

That SwitchHasAuthority is wrong.

This will block the Client from ever calling the RPC.

Authority of a replicated Actor spawned on the Server is the Server.

Everyone else will be Remote.

Just remove that for now.

Try to place some Print Strings throughout your code, and see what calls when and where.

That can go a long way in understanding and solving problems like this.

Breakpoints also help.

[remote tusk]

Yeah anyway, that was one of the issues. I will do that. From what i understand, second client is calling Server Interact,
And server is calling "Get Active Interactable""'s Interact method. But server might not have access GetInteractable, right (i dont get any index error etc. anyway..)? Because we set it locally in the second client. But who is the Server in our instance in that case? The other character that is replicated? Ahhhhhhhhhhhhhhhhhhhh. 😄

Im almost there.

I thought it would check GetInteractable of "sending clients" here. not the server one

[thin stratus]

After the ServerRPC you are on the Server.

It's the memory of the Server. It has no access to the Client.

[remote tusk]

Maybe i should send interactable with event, and it can execute by that.

[thin stratus]

That is one option, but then you allow cheating.

Cause then you can pass any interactable as a client

Where are you filling that array?

[remote tusk]

Then how would i react to that client's interactable, and i dont want to really send a huge data like that. (not sure its huge. :D)

[thin stratus]

It's not huge.

[remote tusk]

OnBeginOverlap function

[thin stratus]

UObject pointers (or AActor here) are send as NetGUIDs.

[thin stratus]

Then split that logic a bit. Run the AddUnique in general and limit the EnableWidget stuff only on LocallyControlled.

[remote tusk]

Thats good to know! I will go on a binge! 😄

[remote tusk]

Hmm, so that server would also know that client has interactables, right?

[remote tusk]

When you meant in general, in Server?

[thin stratus]

No, I mean just not limited to LocallyControlled

[thin stratus]

Both will fill the Array then.

[remote tusk]

Why? Is this because character is already replicated? Because my array is not replicated. Ah, man thank you very much for your patience. I read your documentation today on the underground metro on 2 times, but i still have issues. 😦

[thin stratus]

Remember the Square image I drew?

[remote tusk]

Anyway, going to log this to see whats going on! I have disaster scenearios. 😄

[remote tusk]

Yes, was going there actually. 😄

[thin stratus]

The blue circle is the replicated pawn. And the gray triangle your interactable.

The blue circle will move inside all 2-3 Squares (Worlds), cause it's movement is already replicated via the CharacterMovementComponent.

Well, not really for a Pawn, but for a Character at least.

So if the Client walks into the overlap range of the Stone, so will the Server's version of the Client's Pawn.

So both trigger the Overlap on their end for the Pawn of that Client.

And both will fill the Array.

[remote tusk]

Is Server version of the Client's Pawn exist in the world?

I cant seem to understand Server version of the client pawn, "imagining it" as like the second character in my game which i do NOT OWN.

[thin stratus]

Assuming the Blue Circle is the pawn of Client 1, your "IsLocallyControlled" causes this:

[remote tusk]

For example, this is my client pawn, Where does the Server version of it?

[thin stratus]

In a duplicate world. It's easier to imagine it if you would run the game on 2 different PCs.

[remote tusk]

Hmm, so you mean Remote side?

[remote tusk]

Thats much more clear.

[thin stratus]

So you play with 2 players here, ListenServer and 1 Client.
The screenshot is of the Client. The center is the Character of the Client.
The right one is the Character of the Server, on the Client's PC.

If you run the game twice on the same PC, then it's still 2 different game processes, with 2 different sections of memory.

[remote tusk]

Yes, I started to understand now. What i dont make sense to me is, when my "Character of the Client" is overlapping, and adding things to list,
How the "Server version of my client" knows i added to the list? Since i didnt replicate or send RPC?

[thin stratus]

Yeah, I know what you are struggling with

It's difficult to explain

[remote tusk]

Thats what that doesnt click for me. I feel like I do it for local-single by adding to list after overlapping, But how server version of it also fills the list

Am I missing something like I need to replicate my Array or smth?

[thin stratus]

Hm, can you picture yourself in your own room right now.
And then imagine that exact room, with you, exists a second time.
And all your movements are mirrored between the two rooms.

If you would pick up an apple in that room, it would be picked up in the other one too. Without having to manually sync your pocket having that apple.

No, the Array doesn't need to be replicated for this.

That's because the Movement of the Character is replicated.

The Client running forward will make the Puppet of the Character on the Server's Game also run forward.

They will both run into their version of the Stone, triggering the overlap.

[remote tusk]

So when you say movement of the character, you also mean "Overlap"?

[thin stratus]

No, that's a by-product. I literally mean you holding forward.

If you put both windows, Server and Client, next to each other, and you walk against the Stone on the Client, you see the Server's Version of the Client's Pawn also run into the Stone, right?

[remote tusk]

Hmm, for a second I thought I am using IS Locally Controlled, just because not to add to the other character in my world.
For example, when I move to that stone and pick it up, if i dont check Is Locally Controlled, that would also cause an issue of adding to the other character in my world (local).
For example in Unity, If i give input to my character, and dont check for IsOwner, it would move both character. Since its both instance in my local.

[thin stratus]

No, that's the wrong thought

I mean

Actually it's not

It's the correct thought

But you are thus also stopping the Server from keeping track of the Stone

I might be confusing you more with this Answer.
So let me rephrase.

If the left one walks into the stone, no matter if you use IsLocallyControlled or not, it won't add the Stone to the right one.

IsLocallyControlled makes sure that, if you watch the other Player run into the Stone, it won't be added to their Pawn on your Game.

[remote tusk]

Because of the Overlap Event, But if add some events like "E" key, it would both work but in local. Its like setting Random position with Keyboard Input, It would both work on them, but since its local, it would be randomized in both, which is wrong positioning.

[thin stratus]

No, you are only binding on the local Pawn.

[remote tusk]

Thanks man, I am full-time gem dev working in Unity, and learning multiplayer in my free times at evenings, trying to accomplish my dream game..

[remote tusk]

hmm, if its binding, right. I got it.

I meant smth. like, Think an enemy spawner. It can both work on local, it can spawn at the same time, but if its setting random positioning, it would cause an issue that both client see different positioning on enemies "if its not replicated".

[thin stratus]

On top of that, the CharacterMovementcomponent won't even let you move the other char.

[thin stratus]

That is true.

Because the Random value will be different on each.

[remote tusk]

SO, In Character blueprint, IF I make some changes in LOCAL, are there any chance it affects the other CHARACTER on my local?

[thin stratus]

No

They are two different Instances.

[remote tusk]

Hmm, thats what differ from Unity for me, alright.

[thin stratus]

Suggestion from someone who used Unity 15 years ago before going to UE: Forget about Unity. Stop comparing them.

[remote tusk]

OK. One last question, and i want to validate it; So in here, I add **Interactables **by checking Is Locally Controlled, IF I dont check like that, It will also add that to Server version of the PAWN, but I cant really seem to visualize who is the SERVER version of the pawn, you mean "MY PAWN" in the Server's Instance? Even though I dont replicate it, Can server still know I added that? Is that because Movement Component is "REPLICATED" and its "ADDING IT LOCALLY" in server VERSION?

OMG I understood now!!!

[thin stratus]

Something along thos lines, y.es

The "Server Version of Pawn" is more or less literally the other Pawn you see running around in the Server's Window.

[remote tusk]

On Begin Overlap WORKS Both on Server and CLIENT! For example, if there was a lag, or if my character's speed is 300 in Server, and 500 in client, Even though my client is arrived and added to that list, server would add that "when arrived in his version of it.""
Well its not possible to do that but anyway I understand what you meant.

[thin stratus]

Yeah, in theory at least. Different Movement Speeds would cause Corrections, but yes.

If your Movement wouldn't be replicated, and you moving locally would not move the Puppet on the Server, then walking into the Stone would also only add it locally.

[remote tusk]

In left client, I moved to that, and begin overlap.. It added locally in the client.

In right client, the second PAWN in server instance moved that stone, and ADDED its own version of it's list.

So For example, If THAT STONE wasnt exist in server somehow, (lets assume it)
It would still add in client's version, but not in SERVER!!

OMG I'm illuminated now that what you meant actually "SERVER VERSION of the pawn".

You meant my PAWN that exist in the SERVER's instance.

SO By meaning of this, WHEN I call ServerRPC from client, ITS WORKING in the SERVER VERSION OF MY PAWN.. "NOT THE OWNER'S CHARACTER PAWN".

RPC WILL be called on that PAWN in the SERVER INSTANCE..

OH SHIT MAN. This is game changer.

[thin stratus]

And it made "Click".

[remote tusk]

So If i spawn a stone in CLIENT in our forward. AND MOVE there, it would add it to CLIENT's list.
But in SERVER, since there is no STONE there, it wont add "ITS OWN VERSION OF THE PAWN".

[thin stratus]

On another note. My spacebar doesn't work anymore. I'm ctrl+v whitespaces atm... MONDAY.

[remote tusk]

Thats causing SERVER's PAWN instance interactable list's empty.

MAN, this will be really really game changer for me and going to change HOW I think about it.

[thin stratus]

Yop, or in your actual case, you are limiting it to IsLocallyControlled.
Which is called on Server and Client Instance of that Pawn, and will return true only for the actual Owner. So for the Client in the Client Pawn.

It returns false in the Client Pawn on the Server Instance.

That's why it was empty.

[remote tusk]

Lets overengineer it and lets write a python script that, if your key hit interval is higher than 0.2, it automatically adds space.

[thin stratus]

Removing the IsLocallyControlled ensure that Server also adds it.

You do gotta leave the IsLocallyControlled for the Widget stuff though.

[remote tusk]

MAN, I literally understand %100 of it. THAN YOU. Now its time to understand switch Authority.

[thin stratus]

Cuase you don't want the Server to open a Widget when the Client's pawn steps into the Stone :D

SwitchHasAuthority is as a stupid one. It works based on the "NetRole" of the Actor.
And that has some special rules.

For most Replicated Actors, the Role on the Server will return AUTHORITY and on the Clients it will return SIMULATED PROXY.

[remote tusk]

Yes, Thats game changer. Thats why i added ISLocallyController actually. 😄 Everytime client moves to stone, it shows up on both. And THATS why i thought "ITS about" ownership.. IT was actually other PAWN was spawning the widget on the screen in MY SERVER..

[thin stratus]

For Pawns that are possessed, it will return AUTHORITY on the Server, AUTONOMOUS PROXY on the owning Client, and SIMULATED PROXY on the other Clients.

That's why, when you look at another player in your game, you'd call thos SimulatedProxies.

Cause you are.. simulating them.

[remote tusk]

Are there any use cases or examples you can provide? Man I wont forget your help. I am so f.. excited.

[thin stratus]

So SwitchHasAuthority passes the Top Pin for AUTHORITY role and the bottom pin for any other.

Most people use SwitchHasAuthority to simply split between Server and Client logic.

[remote tusk]

I couldnt find many examples in your docs, OR I remember wrong. Going to check your docs now!

[thin stratus]

I don't think i have a lot of examples there about it.

[remote tusk]

Can we simply say its a bool that "IsServer" XD

[thin stratus]

No. That's the confusing part.

If you spawn an Actor locally, its role will be AUTHORITY.

[remote tusk]

Anyway never mind man, I already got illuminated, and wont be trying to understand that. Dont waste your time for me. 😂

[thin stratus]

If you want to 100% only call something on the Server, you use the "IsServer" node.

[remote tusk]

I got so boosted that now i will enable GAS plugin in my game (hello adhd)

[thin stratus]

It's very rare that someone spawns an Actor locally on a Client and runs code through SwitchHasAuthority. In 99.9% of cases, people use SwitchHasAuthority in a replicated Actor that got spawned by the Server (e.g. your Pawn).

And there, yes, you could call it IsServer.

[thin stratus]

GAS Plugin is pretty complex. :D Maybe wait a tiny bit still.

Get your Interaction stuff working first, so that the ServerRPC changes the Color.

[remote tusk]

Yeah yeah, i am joking. Actually I almost finished the GAS course half of it 6 months ago. And i can really understand WHAT IS DOREPLIFETIME macro.. 😄

[thin stratus]

And then try to read up on the Game Framework classes agian, understand what GameState, PlayerState et.c is for.

[remote tusk]

Dude BTW, those are super helpful. Do you recommend creating my OWN frameworks for my game in C++?

[thin stratus]

Yeaah, C++ needs some extra steps when doing things, like the checkbox in BPs is a bit more in C++.

[thin stratus]

You should, for Multiplayer especially, stick to using the available Framework Classes.

You can create whatever Actors etc. you need beyond that.

[remote tusk]

I will exercise RPC's etc in blueprint, then going to move forward on C++ because i really have hard time convrting my blueprints to C++. Especially today when i couldnt manage simple task. 😄

[thin stratus]

But I would suggest not replacing the ones that exist.

They are deeply tied into the Engine.

[remote tusk]

Then i will create my own SurvivalGameState, SurvivalPlayerState etc.

[thin stratus]

Doesn't go for ALL of them, but for beginners, it's best to just use what is there for now.

[remote tusk]

Just in case.

[thin stratus]

Yes.

And keep in mind that UE/C++ is an Inheritance-based Language.

[remote tusk]

I actually used that framework in some of my Unity projects. 😄

[thin stratus]

BaseGameState -> MainMenuGameState
BaseGameState -> GameplayGameState
GameplayGameState -> SurvivalGameState

You are doing yourself a favor building up inheritance chains, to have reusable code that you can override in child classes.

[remote tusk]

Until now, I was really ignoring GameState, GameMode etc. I was even swearing Why the f. i have "score" etc. But i can understand now why.

[thin stratus]

Yeah, that's cause UE has a lot of First Person Shooter logic from Unreal Tournament days.

But you gotta just ignore those variables and functions for now.

[midnight torrent]

Hi everyone! I made simple RTS-like movement to control everything from the server, so "move to" command comes from client with location info and server call Move To Location, if it's just one click - everything is fine, but when I tried to make some "hold mouse button to follow cursor" and just resend info with 0.1 period - client side start jittering. I play a little-bit with replication options on my character class but nothing helped. Maybe somebody could tell me in which way I need to go to fix that issue?
(I disable animations so effect is more notable)

[thin stratus]

exAres trying to find a point where they can finally ask

[remote tusk]

These game frameworks are really good for inheriting, I love Composition over Inheritance but its not valid at that point.

[thin stratus]

You can do some composition via Components fwiw

And later on via UObjects, but that is bit more advanced,.

[remote tusk]

Yes, built my Interaction system whole on Component, so that i can simply add the component and boom, my character can interact others, no other one.
But i couldnt understand how its replicated though. It can use ServerRPC's etc. and Replicate Component is not "ticked".

[thin stratus]

Problem is that if you aren't using the Character Movement Component and you aren't using its prediction logic to move the Character, you won't have smooth movement.

[thin stratus]

I think it would need to be marked as replicated to allow ServerRPC, but maybe I'm misremembering. It follows the same idea that, since the Component is part of the Pawn, if the Pawn exists on the other Instance, so does the Component.

There is some more advanced logic going on about what can communicate and be communicated over the net.

But I don't want to overload you with that info.

[remote tusk]

Now its time to combine Blueprint and C++ together. My ADHD is not allowing me though. I am in a deep thought that, once C++ whole c++, once blueprint, whole blueprint.. I think thats because of my less experience.

[thin stratus]

You can, fwiw, send a Component of a replicated Actor through an RPC and the other side knows how to resolve it. Even if it's not replicated (the Component).

That's cause it'll be resolved through the replicated Actor, since both Instances in theory would need to have the Component.

[thin stratus]

Yeah you mix them actually. Core logic in C++, more defined things, and setups (like positioning Component, setting default values, etc.) in BPs.

GAS does a lot of stuff in Abilities via Blueprints too

It's not black and white, it's mostly about performance in the end. Just do what you want for now.

Well and for Multiplayer it's about having access to roughly 80% of the stuff that otherwise is not existing in BPs lol

[remote tusk]

I have also Perfectionism, and thats really slowing me down. For example, I removed my whole inventory system in blueprint, and started to write in C++. 😄 I didnt even try to replicate it in Blueprint.

[remote tusk]

Yes, I actually experienced that in LYRA framework while doing a case for a company.

[midnight torrent]

Hmm.. I'm using CMC, just not using inputs from client, so client lag could lead to some delay, and client will see things later, but why jittering?(especially when everything is on one machine) It's the same as client just watch and do nothing

[remote tusk]

This will be a career changer man. This node is where everything start for me, A WHOLE another world. 😄 I can really understand Server & Client relationship now in basics.

[thin stratus]

If you aren't using the AddMovementInput locally for a POSSESSED Character, you won't have smooth prediction.

[midnight torrent]

I don't use AddMovementInput , I am using Move To Location Or Actor on the server, client just send location

[thin stratus]

And the Character is possessed by what?

[remote tusk]

I want to be in a position that I understand why C++ is much better in Multiplayer, but for now, it would be enough for me. Also read a documentation from Wizard etc. smth like that, talking about Replication Graph and NetSerialize etc.

But i am not in a position for now to decide. 😄

[thin stratus]

Yeah no, that's a few weeks away.

[midnight torrent]

By AI, no pure control from client

[thin stratus]

Stick to learning the basics first.

[lament flax]

who tried mover here ?

[thin stratus]

Then you get jittering and corrections.

[lament flax]

cedric you did iirc ?

[remote tusk]

"https://wizardcell.com/unreal/multiplayer-tips-and-tricks/"

[thin stratus]

I think I have to leave. I'm suddenly feeling very ill.

[lament flax]

go rest

[thin stratus]

Something fishy.

[lament flax]

:(

[thin stratus]

What do you want to know about M🤮ver

[remote tusk]

Thanks man, I wont be in hesitate. Just going to replicate. I dont really have complex stuff, Just interacting without anims, adding to inventory etc.

[lament flax]

how fine is the physic based movement in SP

because im about to convert my BP prototype to c++

[thin stratus]

I have no clue. I only used the non-physics, FixedTick version of it in Multiplayer.

[lament flax]

okay

[thin stratus]

And I still can't recommend using that over CMC.

Especially if you are doing Singleplayer.

[lament flax]

ill go back to my solution then x)

[remote tusk]

Anyway, Cedric-sama, thank you very much for your time and its really really game-changer for me. You really made my way much clearer.

[thin stratus]

No worries.

[remote tusk]

Replication SUCCEED!

[midnight torrent]

I didn't get "why", if it's just from server, no corrections needed) But thx very much, go and rest)

[thin stratus]

The "feeling ill" was a joke cause I didn't want to deal with Mover.

[midnight torrent]

Ah

lol

[thin stratus]

The CMC is set up for Client Predicted Movement through the AddMovementInput call, as well as calls like Jump and Crouch.
Those are send, internally in the CMC, as ServerRPCs.

The whole CMC works differently based on who is running the code.

The smoothest is when the AutonomousProxy uses it to predict.

[remote tusk]

I really heard "custom movement" is a really headache on multiplayer

[thin stratus]

If you use an AiController, then the local player is just a SimulatedProxy.

[remote tusk]

GASP already published a replicated version of it in 5.5. Do you think its worth using it?

[thin stratus]

And that one can't predict and only gets the transform replicated back and smoothed.

Why it's jitterting that crazy? Not sure, probably cause you aren't sending the info every frame, but only every 0.1 seconds.

[remote tusk]

As in client & server with 0 ping, it looks great but.. 😄

[thin stratus]

No clue, I barely use third party solutions.

[remote tusk]

Hmm, does Unreal Engine's Game Animation Sample count as third party?

[thin stratus]

@midnight torrent Try either sending it more often (every frame, with an Unreliable RPC), or fwiw less often?

[remote tusk]

Anyway, i gotta go. Have a good day sir!

[thin stratus]

You will always have a delay of course, since the RPC + the replication back is what the Client has to wait for the movement to have an effect.

[thin stratus]

In theory, yes, but there I'm a bit more trusting. :D

Although my adventures with MotionMatching and Mover the last weeks have been semi fun.

[remote tusk]

Anyway, i will stick into TPS character for now. 😄

[midnight torrent]

It's trembling and become some jittering chaos) I'm start thinking that the problem is inside Move To Location Or Actor, but need to make clear project to check it.

[remote tusk]

I can now understand a potential bug can exist on future, If there are many "Interactables" in ground, there is a slight chance that in Client's list last element & Server's version of it's can have different last elements, causing wrong item to be interacted.

If the sync latency or ping can happen,

[thin stratus]

Correct. There are a lot of ways to fix that. But it can get complex quickly

[remote tusk]

To validate %100, maybe i can send interactable paremeter with RPC, and call its interact method

I dont care about cheating in my CO op survival. 😛

[thin stratus]

The simplest solution is to use SwitchHasAuthority on overlap and marking the array as replicated. Then only the pawns instances on the server fills the array and it replicates back

[remote tusk]

Hmm, sounds like a good idea as simplest.

[thin stratus]

Adds a slight delay but that wouldn't be too drastic in this case cause the client won't know how close it really is to the object anyway

[remote tusk]

So that only SERVER version will handle array, going to replicate it to "MY CLIENT" ACTUALLY.

[thin stratus]

And if you want to react to the array changing to show UI, you mark it as RepNotify again and limit to IsLocallyControlled in the OnRep

[thin stratus]

Yop

[remote tusk]

Fastest simplest trash way? Can I just send Interactable as parameter, and call directly on Server version of it?

To have seamless and fast reactions.

As i said, i wont be caring about cheating in CO-OP game, and i would be happy if they cheat if my game grows up that much. 😛

[thin stratus]

Then yes, you can trust the client and pass it to the sevrer

Then you can also keep the array only filled locally

Look at you, actually understanding this shit now.

[remote tusk]

Well, thanks to you Mr. GOD MULTIPLAYER DEVELOPER

[thin stratus]

Gonna watch some TV now. Getting late in Germany. Need to rest a bit.

[remote tusk]

I cant wait to get my hands dirty on the weekend. Now i will watch tutorials much better. (not the shitty ones that MC everywhere.)

[remote tusk]

Bis später

[thin stratus]

It's good to watch a bunch of them anyway and question everything they do.

[remote tusk]

Yes, Actually like KEKDot for now because of explanation of things.

see you sir

[thin stratus]

Did you watch the video that is in the resources of my docs?

That explains the basics too

[remote tusk]

I didnt reach there actually, But are you talking about the guy who explains framework then stuffs?

[thin stratus]

#multiplayer message

[remote tusk]

"https://www.youtube.com/watch?v=JOJP0CvpB8w"

[thin stratus]

Yus

[remote tusk]

Yesterday I watched that, I was a bit overwhelmed for me. But now I can watch this peacefully. Still confusing parts though, it will be different.

[ashen plume]

Any tips or workarounds on implementing a character controlled by multiple players? Think mario party co op minigame. For example, feeding the addinput function an average of each player's replicated input direction.

[formal solar]

Can't give technical info but just from thinking about it for a second even as a dummy, that's a LAN game right? Sounds like something that would rely heavily on it being a LAN setup, if you tried to do this for a game connecting people with ping it would either be unworkable or very very complicated

[fallen fossil]

Can I somehow compensate speed of clients pawns ? They feel much slower than server ones

[dark edge]

I would implement that as an AI controlled character being fed data from everyone

[steep panther]

is it even possible to achieve the multiplayer performance of Ark / Fortnite / etc's player buildable objects with blueprint?

cant seem to figure out a setting that isnt hugely heavy on the network when at 10,000+ player build objects that replicate

[cerulean forge]

Hi all, it's been a long time since I've dealt with replication and I think I'm a bit lost, I'm doing an inventory with a grid and I'm using a TMap of FVector and bool to check if a cell of the grid is occupied or not. I know that TMap doesn't support replication and I only want to do these calculations on client because I don't want the server to have all these calculations. The thing is that I was interacting with the inventory system of the Lyra project and it turns out that when I update the TMap to add an object from code everything goes fine, but if I want to make any change from the inventory widget then it does not enter the execution, I have put break points and nothing, but this is funny because I have put logs, and the logs are printed, so there must be some discrepancy that I'm not considering. The method where I update the TMap when I add a variable is BlueprintCallable and when I call it, it doesn't update and it doesn't enter the breakpoint or anything. I'm a bit lost, I don't know if anyone has any idea about this.

[fossil spoke]

No

[steep panther]

thats kind of what i am experiencing lol

i know that Fortnite and Ark both basically went entirely C++ after their initial launches

[fossil spoke]

Why would you make that assumption?

Generally speaking, you will want to do core implementation details in C++, with BP extending that.

[steep panther]

not assuming, info from tech chats / unreal fest / etc

[fossil spoke]

Suggesting its entirely C++ is an over simplification of what probably happened.

There is nothing wrong with prototyping in BP, to prove out of a feature or idea.

[steep panther]

definitely an over simplication - but migrating a lot of the heavier aspects of the games to C++ is how a lot of performance was brought back

[fossil spoke]

Then rewriting in C++ with BP supporting the designer friendly elements.

[fossil spoke]

Thats how you should have said it to start with, would be more accurate.

ARK was terrible for perf for like the longest time.

[steep panther]

indeed lol

[fossil spoke]

Anyway, back to your initial question.

The main reason is that you have so much more opportunities for optimization in C++ than in BP

Especially in Multiplayer.

There is just a lot of important things you cannot do in BP.

[steep panther]

anything specific you can share easily?

its definitely looking like ill need to migrate the player built objects to C++ instead of being BP actors for sure

[fossil spoke]

Fast Arrays, Push Model Replication, better async support... all types of things.

[steep panther]

BP doesn't support push model even with Iris?

[fossil spoke]

It kinda does, but also doesnt AFAIK.

Push Model is opt in per property.

So unless BP now supports it natively out of the box, I dont know how they would be managing it.

[steep panther]

yeah i dont see anything that would change it to being opted in at the moment in bp

[fossil spoke]

If you are making a serious game, you just dont do Multiplayer in BP.

End of story basically.

[steep panther]

so if you already made an entire game in bp exclusively, and then start having multiplayer performance problems at higher clips (like 10,000 player built objects for example), the answer is to redo a lot of stuff in C++?

even using the latest engine version, Iris, etc

[fossil spoke]

Pretty much

[steep panther]

thats a bummer

especially with how many assets on Fab / marketplace advertise as being ready for a big multiplayer game

[fossil spoke]

Just converting it into C++ isnt going to change much. But you need to redesign that particular feature to take advanatage of different optimization techniques.

[fossil spoke]

There would be very very very few that actually live to that.

[hallow sand]

I'd put money on that answer being zero of them, lol. From experience.

[exotic wasp]

most of them are also probably made in c++ and just exposed to bp

[fossil spoke]

Im giving the benefit of the doubt 😛

[hallow sand]

Very few assets on the marketplace are even remotely ready for large scale multiplayer. They work to prototype a game / idea, but if you try and push them to scale - they just flat don't work. Most of them will even tell you that if you ask, but that info isn't on the marketplace for obvious reasons.

[fossil spoke]

Most of the C++ assets Ive seen are dog shit to though

[fossil spoke]

I would wager a guess that the reason thats the case is 99% of people that could make systems for large scale games are working their asses off doing just that at companies paying more than the Marketplace would ever make them.

And I say that because thats the reason I dont do MP stuff either lol

Its just not worth it.

[hallow sand]

After working at this for years now, I honestly think a lot of the marketplace stuff is kind of giving people false hope that they can make a game like Ark or Fortnite using BP / without knowing how to code stuff themselves, and it just isn't true. Straight up. I've learned this the hard way* after shipping a game made in BP and trying to scale it.

[fossil spoke]

Its just catering to a demand.

People think they want to make a game, they go searching for how to do that. They buy stuff that thinks will help them... Simple as that.

Its not like the Marketplace was the reason there is a huge demand for that now.

That demand existed before. It just wasnt being served.

[hallow sand]

Do you think that demand is kind of misleading though? "Making a game" vs "making a prototype that can't scale in the way you make it"

[exotic wasp]

thats most prototypes tbh

[fossil spoke]

Sure you could look at it that way, but whose fault is that really?

The person that didnt do their research first?

Or the Marketplace.

[hallow sand]

I think the argument could be made for both.

[fossil spoke]

Can you really blame the Marketplace for someone wanting to explore an interest.

[exotic wasp]

marketplace assets are great as long as you arent trying to make a AAAA open world MMO rougelike blockchain AI enhanced live service game

for their target audience they are fine

[hallow sand]

When an asset on the marketplace is advertised as "large scale multiplayer," "multiplayer ready," etc with no fine print, when it isn't true at all? Meh.

[fossil spoke]

Its not feasible to judge that though, because a lot of the times its a skill issue as well.

[hallow sand]

I had a recent example of this with an interactable foliage plugin that was advertised as multiplayer ready for "massive worlds" including world tiling etc. and in practice - it can only support 150 "harvested" objects in multiplayer before it no longer works haha

[fossil spoke]

That entirely depends on how you as an individual want to use it, and also what you define as "masssive"

Im just playing devils advocate here. I think most of the MP stuff is garbage.

[hallow sand]

It can be depending on the asset for sure. Obviously it's possible to take an asset and fuck up the implementation and every breaks.

Most of the assets on the marketplace don't work out of the box at scale, I don't see that as a skill problem.

[hallow sand]

I agree with this 100%.

I also don't mind playing devils advocate for the sake of game dev chat lol

[fossil spoke]

Its like complaining that UE itself is bad at making certain types of games.

While that is true

[exotic wasp]

i think if someone is trying to make a large scale game and buys assets off the marketplace and kludges them together, they are going to be disappointed.
i see SO MANY NEW PEOPLE who come here having never even run the editor wanting to make the next multiplayer skyrim.

[fossil spoke]

That doesnt mean you cant.

[fossil spoke]

People think making games is easy, thats the real crime IMO.

[exotic wasp]

making a game is genuinely, not as hard as a lot of people make it out to be. its just as complex and as hard as you make it.
want to make a flappy bird game? you can do it in like 2 days.
want to make a multiplayer shooter that doesnt feel like ass? much much more difficult...

[steep panther]

this is a huge bummer

[fossil spoke]

Yeah, which is why I try and advise people to start small, instead of trying to make the next Call of Duty.

[fossil spoke]

Im talking about from someone who has never made a game before.

A professional could crank out flappy birds real quick.

Someone who has no idea what an Editor even is, wouldnt.

[fossil spoke]

Yeah, the rose colored glasses come off pretty harshly.

[steep panther]

so without C++ a multiplayer game like Ark is just out of the question?

[fossil spoke]

Not exactly.

It will just run like crap.

[exotic wasp]

like ark 🙂

[steep panther]

https://tenor.com/view/lmfao-laughing-gif-25145562

[fossil spoke]

You could do ARK in BP with plugins and stuff, but its not going to be great.

Probably worse than ARK was.

ARK isnt a small game though dude.

[exotic wasp]

^

open world survival game with up to hundreds of players is not simple in any way

[fossil spoke]

Yeah forgot about 100 players.

No chance you will get that in BP

Be lucky to manage 20

[steep panther]

im having issues with 5 players after they build a shitload of stuff, not trying to hit 100 players haha

[fossil spoke]

There you go

[exotic wasp]

does even the dedicated server struggle?

[steep panther]

after players have built thousands of objects it is pretty brutal

[fossil spoke]

This is one of those forks in the road, where you either give up, or decide to grit your teeth and bear the heart ache of pushing forward and learning something new to get better to reach your goal.

Giving up is easy.

Learning something new is hard

And will take a lot of time

And effort.

But the rewards will stay with you forever

[exotic wasp]

tbh, if you know how bp works at all and can makes things in it, the logic is the same in c++. just literally a different language.

[sinful tree]

https://tenor.com/view/sport-success-perseverance-run-run-forest-gif-17155902

[fossil spoke]

That makes no sense lol

[exotic wasp]

depends on where the poor performance comes from

[fossil spoke]

"How do I get C++, without C++"

Take the plunge man, go and learn something new, you might find you like it more than you thought.

[sinful tree]

Really the only way is to make functions in C++ that you can call from blueprint.

[dire cradle]

You don't have to rewrite entire systems in C++

You can just convert the expensive functions and call from bp if you prefer

It won't be 100% of C++'s performance but will still be very close

[exotic wasp]

IMO just converting something to c++ isnt going to meaningfully improve performance as the bad performance is probably stemming from a single source

[steep panther]

im sure my functions arent perfect but my main issue seems to be the same with players building a lot of shit making the performance tank eventually

[hallow sand]

FPS or multiplayer / network performance??

[steep panther]

both lol

[exotic wasp]

did you confirm if its actually lag related to multiplayer or just because you have a ton of graphics?

i would be shocked if 1000 dormant actors is causing network issues

are they doing anything with the network after they're created?

[dire cradle]

You can scale the relevancy and net update settings down

do you need to replicate max health and the static mesh?

[exotic wasp]

set them as dormant

[dire cradle]

If they don't do anything on the network and are pre-placed, you don't need to have them set to replicate at all

[exotic wasp]

i have no idea how iris works compared to normal unreal

in my mind, i cannot understand why 10000 actors would cause performance issues (on the server) if they arent ticking and are dormant

[fossil spoke]

At this point I would also recommend that you actually do some Profiling.

[exotic wasp]

^^^^^^^^^

[fossil spoke]

Find out exactly what is the bottleneck.

Address that issue as best you can.

Then profile again.

Address whatever becomes the new bottleneck.

Etc etc

Then go touch

[dire cradle]

Can still profile in a listen server, stuff that's causing network problems in a dedicated server will also do so in a listen server as well

[sinful tree]

Just a random guess, the server still has to check if those 10000 actors had any changes to their replicated properties that would remove them from their dormant state.

[exotic wasp]

i dont think dormant actors check replicated properties

[steep panther]

for health on player built objects, would repnotify be any better than replicated? when using Iris

[sinful tree]

You're probably right 😛

[exotic wasp]

performance would be the same (or worse)

[fossil spoke]

It would likely be worse, since it incurs another function call.

[exotic wasp]

dont use an rpc for that

[hallow sand]

Why not? What's the alternative to that?

[exotic wasp]

normal replicated properties

[fossil spoke]

Health is stateful, RPCs are not.

[exotic wasp]

^

[dire cradle]

RepNotify does the same thing as a replicated variable but also does a function call on top of it, more expensive

[exotic wasp]

i think any more discussion on performance is entirely pointless until you profile your game

[fossil spoke]

This

[exotic wasp]

if your objects are dormant, those 10000 actors arent doing anything bad for performance on the server

[steep panther]

i thought replicated variables kept updating and repnotify only updated when needed?

[exotic wasp]

no

[hallow sand]

That's old info as far as I'm aware

[exotic wasp]

i dont think that was ever true

[dire cradle]

replicated variables also only update when changed

They even only send deltas instead of whole values (when applicable)

[steep panther]

is there a way to check if they are actually dormant? my current setup they dont despawn after leaving the range that they spawned in originally

[fossil spoke]

The whole 10k Player Built Actor thing could easily be solved inside of 1 replicated Actor BTH.

[hallow sand]

https://tenor.com/view/the-universe-tim-and-eric-mind-blown-mind-blown-meme-mind-explosion-mind-explosion-meme-gif-18002878

[exotic wasp]

do network managers work with individual relevancy on actors?

[dire cradle]

Yeah just make a manager actor for buildings

[exotic wasp]

i never understood how they handled that

[fossil spoke]

No, relevancy for a manager like that isnt really a thing.

[exotic wasp]

that sounds like relevancy

[fossil spoke]

Depends how you architect it

You could have a manager per chunk

Which is then affected by relevancy

[exotic wasp]

thats what i figured

[dark edge]

On the topic of network managers, anyone have any thoughts on how to architect a manager that can just replicate "tagged" variables? The true data exists within subsystems, although I'd be open to going to components on GameState.

[fossil spoke]

What do you mean exactly?

[dark edge]

So right now my system is architected like this, using subsystems

MasterSubsystem (thing that has the tick)
DeviceSubsystemA
TArray<FDeviceModelA> DevicesA
DeviceSubsystemB
TArray<FDeviceModelB> DevicesB
DeviceSubsystemC
TArray<FDeviceModelC> DevicesC

And say FDeviceModelA looks like:
float F
float G //I want this single property to be authoritatively synced
float H

It's a big sim, and I only want certain values to be synced authoritatively, all other values can update independently on all machines

[exotic wasp]

just mark float G as replicated?

[fossil spoke]

Just mark it as NotReplicated?

If its inside a USTRUCT

Alternatively, if you override NetSerialize for that Struct you can literally just not serialize the other properties

[dark edge]

I'll have to think about that, right now not everyone has the entire background sim going, they only have the portions that relate to their relevent nearby actors.

Unless I just toss relevency and have everyone run everything

[steep panther]

is insights the best tool to profile networking stuff?

[thin stratus]

I would say so, yes.

[dark edge]

I think I'll see about maybe just doing the replication through each "avatar" actor. The entire sim runs in the background, but there are actors that represent sim state.
Say I had the simplest vehicle with 4 wheels, an engine, a gearbox, and a cockpit. That'd be 7 replicated actors which locally instantiate models in the sim when they begin play. I don't care about intermediate sim values being synced as long as the final end results are.

So, in this case, I'd replicate the movement of the actors, the cockpit input state (where your controls actually go in to the sim), and the one replicated sim state value would be the gearboxe int CurrentGear, because it's discrete, not continuous. Although the server and clientside sim will both change Gearbox.CurrentGear when it detects GearChangeSignal transition from < 1.0 to >= 1.0, the serverside version will also change that for the client in OnRep. That'll handle the cases for sim divergence. This approach would also move the responsibility for networking from the sim side to the actors side, leaving it open to designers.

[molten moss]

hey boys

So I have this game which I want to run local standalone instances of, I've got it running and working BUT, when all windows are deselected GPU recources are split and everything runs at 30fps, however, when I focus a single instance, the fps & gpu usage drops on the other ones ( to 1-3fps) . How do I combat that? Is that nVidia setting or something in editor?

I have "run under one process" disabled in PIE settings

[dire cradle]

checking off ''use less cpu while in bacgkround'' in the editor settings may help

[molten moss]

That is done as well

I remember there was setttings for mouse focus & auto steal but I cant find em right now

will see and hope that this helps -=

nope, its still picking favorites

[oak pond]

why are so many things I do with multiplayer so inconsistent no matter what? like right now Im working on a simple explosion actor, very simple script, replicated it and it just... works most of the time. like enemies take damage but dont always get pushed by the radial force/launch character, and I just dont get how things can be so inconsistent when its so simple

things like this I cant see any other way to do it so I cant even imagine how to fix it

[dark edge]

show code

Show what triggers an explosion and what it do

[dire cradle]

It's not that multiplayer is inconsistent, there's just many stuff to take into consideration like latency, relevancy, ownership etc.

It depends on your implementation

[oak pond]

yeah I guess if anything the problem is within the enemies since they got so much going on

always lots of little things

also though I cant seem to get a sound working no matter where I put it, begin play, server event etc the sound just does not play in multiplayer despite every other sound effect working just fine, idk if this is anything anyone can even help with but

I often post my problems and then realise no one else would really be able to help because the project is about a year and a half in and everything I do now will be working with so many other things which is kinda impossible to explain it all to anyone else

[dark edge]

Can't even begin to help without seeing the code

it's probably something simple

just show the causal path between BitThatTriggersTheExplosion and the end result

[molten moss]

Alright, so, limiting the max fps cheats around the issue .

but it feels like a cheat, not the proper way to do it

[oak pond]

well thats why Im saying theres so much else going on that I would have to show like 10 screenshots of every different part and then it still might not even be the right part

and this explosion thing was only one example, most of my problems seem to be related to physics (no surprise there) like sometimes when the enemy ragdolls, their mesh was teleporting to 0,0,0 but if I simply add a small delay it fixes it

and I can have a script where everything in it works but a sound effect within that script just doesnt

same with radial force

sound really is just simple as

spawns actor just fine, but no sound at all

like how does that make any sense

[sinful tree]

The majority of objects don't have any replication. The things that usually have any replication are Actors and Actor Components, but even with them not everything about them will be replicated for you.

[oak pond]

of course, but in this specific case I cant replicate a sound with server event or even multicast (multicast has fixed some things even in non player actors which I dont understand at all since I thought they only needed server events)

[sinful tree]

Server Events are a means of allowing clients to call that event to have the server do something. If the actor isn't owned by a client, then they won't act any differently as clients won't be able to call them, however, the server itself can still execute said events.

Assuming this is a cannonball actor, and assuming it is a replicated actor, it's unlikely to be client owned. The server should be the one doing any logic relating to the cannonball anyway, as you probably wouldn't want a client to prematurely allow their cannonballs to explode by letting them tell the server to explode it.

If the "Explosion" actor is a replicated actor, then you could technically just attach a sound component to it that would play the sound automatically when the actor spawns on any clients.

If you still want to use a multicast to play the sound at this point in time, you can, just don't immediately use the "DestroyActor" node as that can potentially cause the multicast to fail to be received before removed on clients. To cirumvent this, you can use the "Set Lifetime" node instead and delay it by a certain amount of seconds, after which the actor will destroy itself.

[oak pond]

ooh right, in this case these cannonballs are fired from the player so I can set them as their owners. although I think I already did that...

and I did also try just playing the sound on begin play and even then it didnt work which I really dont get

ah, sound component works though

so whats the difference between sound component and just spawning the sound in this case? I wouldnt have thought it would make a difference

especially since the cannonballs already play a sound when bouncing off walls and those work fine too

[sinful tree]

Pretty sure spawn sound at location attaches a sound component to this actor, and since you're immediately destroying it, the sound component goes with it.

[oak pond]

makes sense but then Id expect it not to work in singleplayer as well

and spawning it on the explosions begin play doesnt work, but playing the audio component does

also on the subject, if I had another actor that also spawned this explosion actor but used a different sound, I would want to change the sound after spawning it, but since its on begin play it most likely would change after playing the sound, same thing goes for any variables changed like this, whats the best way to do that?

and I still dont see why radial force wouldnt work

[elfin plover]

Hey all. I have a listen-server setup and am using the Character Movement Component. When emulating, clients see the server and all other client animations play just fine. The server however, sees the clients' animations play at a much slower rate. If I override the Character's OnPossess function to set bOnlyAllowAutonomousTickPose to false, the animations play way too fast at a higher FPS. How can I achieve smooth client animations on the server?

[thin stratus]

The Animation, and the Pose, are ticked by the ServerRPC of the CMC. That's done to ensure that the Animation events are more in sync.
Traditional solution was to do what you are doing, but then you gotta remove the parts where the CMC ticks the Pose.
That was usually just one place, but I think that has changed, so no clue anymore.

I do remember people usually telling me that this is solvable differently. Potentially just through changing some of the smoothing variables? Not sure.

[dark parcel]

void AAGCharacterBase::PossessedBy(AController* NewController)
{
    Super::PossessedBy(NewController);
    GetMesh()->bOnlyAllowAutonomousTickPose = false;
}

Also below I have this run on Character's Tick.

    if (auto* mesh = GetMesh())
    {
        if (mesh
        && IsReplicatingMovement()
        && (GetRemoteRole() == ROLE_AutonomousProxy && GetNetConnection() != nullptr))
        {
            if (HasAnyRootMotion())
                mesh->bOnlyAllowAutonomousTickPose = true;
            else
                mesh->bOnlyAllowAutonomousTickPose = false;
        }
    }

@elfin plover this is what I do and I haven't encounter issue YET. Another approach is just using dedicated server I guess.

[fallen fossil]

I solved problem with faster actor , i was moving actor twice on server, so server player was faster not others slower

[fallen fossil]

RPC are replication independet?
I disabled replicaiton and rpc still goes to server 🤔 interesting

[upbeat basin]

Is it a component that you disabled the replication from?

Components should just being registered as subobjects to their owning actors and using their net connection, so they might be able to work as replicated even though their replicated bool is not set to true. I'm telling all this from a very old conversation I had in here though, I might not be remembering it correctly or misunderstood the concept. So take this with a grain of suspicion (and I would be happy to be corrected)

I have no idea to spit if it's an actor though. But no, RPCs should be dependent of replication or a channel at least

[fallen fossil]

no, just in CDO for pawn

    this->SetReplicates(false);
    //bReplicates=false;

[midnight torrent]

Hi. I'm here again) Maybe someone could help me understand what could lead to such strange behavior(it works correctly on clean project, but I can't find differences in project configurations what could make such things).
Movement logic is just on server, but when it's triggered FROM server it works like charm, MoveToLocationOrActor works perfectly, when mouse button is down - both characters move to the cursor, but when it's triggered from client - MoveToLocationOrActor works only when clicked(and released), but all server code is firing as always, no differences, all needed data etc. I can't get it.

[chrome bay]

Doesn't matter because as soon as you possess it the engine will tell it to replicate anyway

[surreal plaza]

Can someone give me a sanity check on architecture? I am working with UI components that quickly change based on use state (fighting vs rapidly building weapons) and am using RPCs to take in client requests and then RPCs to send out updates to the clients UI. This is mainly whether or not some submenu is displayed. I can see doing this with RPCs or some onReps, but wasn't sure if there is a best practice. But RPCs feels fragile to me somehow. Is there a best practice for doing this sort of setup?

• Users are initiating menu change events almost as quickly as they can type.
• I am supporting 4 players

[dire cradle]

UI is just the place the data is presented to the player, you don't need to network menu changes it should be totally client-sided

Just replicate the game data and let the client UI pull that data by itself without instructions from the server

[snow trail]

hello, does anybody know how to get the JoinSession node working in 5.5?
it keeps failing instantly, before it even fires the normal execution pin

i've found people with this problem already, and the plugin im using (AdvancedSessions) supposedly fixes it (ive also checked the code and it does appear to be trying to fix it)
https://forums.unrealengine.com/t/ue-5-5-online-subsystem-join-session-always-results-in-on-failure/2125579/6
still, even with the workarounds implemented i cant get it to work

[fallen fossil]

https://tenor.com/view/really-are-you-kidding-me-got-to-be-kidding-youre-kidding-me-seriously-gif-6521278384595665157

so I can just disable it locally in on posses?

or must be on server too ?

[chrome bay]

You can't have a non-replicated pawn, how would that work

[fallen fossil]

locally 😄

[dire cradle]

steames community

^dont trust the link

[fallen fossil]

<@&213101288538374145>

[fallen fossil]

How can I log distinct messages on client side? Every player controller seems to use same name 🤔

[dark edge]

Ballpark how hard would it be to make my own simple character movement component? Anyone here done that?

[lament flax]

Using a fucntion of GEngine you can get client id

I think it only works in PIE tho

[snow trail]

bump? ive tried anything i could think of but to no avail
it really just seems like joinsession node doesnt work in 5.5

[quasi tide]

Depends on how "simple" you're talking. For something fairly simple, shouldn't be too much effort. The main challenge, at least imo, is handling client corrections.

[dark edge]

I'm probably talking about a capsule and only supporting acceleration-type inputs, no root motion or anything like that. Just something like a baby CMC, I just prefer to be able to wrap my head around the entirety of a system. I really like the idea of physics driven characters so maybe something to accomplish that in a simple way.

[grand kestrel]

Are you gonna do sim proxy smoothing
If not, how are you going to handle low update frequencies

I think you'll find yourself reintroducing a massive amount of CMC because a lot of it exists out of necessity 😄

From a learning perspective I think you should just start piecing together your own CMC, it is a good experience for growth

Make it support a cube
Add angular velocity
Make it simulate the cube same as how chaos simulates a cube
Then extend it so it can be kept upright, or similar
Now you have arcade vehicles with net prediction 😛

[dark edge]

I think there can maybe be some room for something akin to the physics replication system, where it's not as strict and the corrections are all smooth

[dark edge]

I'm working on a physics vehicle game so yeah I think a generic system could work.

[dark edge]

Cubes have edge cases, literally. Spheres and capsules are ez pz

[oak pond]

Ive been stuck with something for so long, has anyone else had ragdolls (just setting simulate physics on a skeletal mesh) teleporting to 0,0,0 when physics is enabled?

Ive assumed this is a me problem but I genuinely cannot find out what the hell would be causing it

specifically on enemies btw

but I dont even set location or anything anywhere I literally just enable physics

seems to happen specifically when using launch character on the enemy right before they ragdoll

its literally just this

I dont even know how to DEBUG it let alone fix it

I dont know if this is even helpful at all but I just dont know how else to even explain this

[dire cradle]

Does it only happen to clients?

[fallen fossil]

Does replicate movement, is limited to replication only location / rotation, and for any other stuff I must enable "replicates" ?

[dark edge]

I'm pretty sure replicate movement will do nothing without enabling Replicates

"hey everyone, the actor that you don't know about is now over here"

[fallen fossil]

no, thats default pawn settings

unless unreal is switching "recplicates" after begin play or something

I can't find related varaible in my pawn code

maybe its private

private:
    /**
     * If true, replicate movement/location related properties.
     * Actor must also be set to replicate.
     * @see SetReplicates()
     * @see https://docs.unrealengine.com/InteractiveExperiences/Networking/Actors
     */
    UPROPERTY(ReplicatedUsing=OnRep_ReplicateMovement, Category=Replication, EditDefaultsOnly)
    uint8 bReplicateMovement:1;    

ok, you were kinda right

[oak pond]

not sure, hard to tell but it’s definitely only multiplayer

[elfin plover]

On the mesh, what is your KinematicBonesUpdateType value set as?

[ruby parrot]

Can this not be properly replicated?
a variable in this SaveGame is CharacterName
when i put this in tick...the server says "Tugs" and the Client says None

[fallen fossil]

condition is none

set to intial or something else

[dire cradle]

None just means default in this context

[dire cradle]

It's an object reference, the object might not exist in the clients

by default objects are not replicated to clients automatically unlike replicated actors

[ruby parrot]

i hate this 😄 not a single tutorial that just shows how to do multiplayer savegames just with a name or health value...no they all show 700 different variables and shit noone needs and it takes forever to learn this xD

[fallen fossil]

whats default replication then?

default means: objects no, actors yes ?

[dire cradle]

No it means there are no special conditions, so the variable just replicates like normal whenever it changes

conditions like owner only, initial only etc

[dire cradle]

You could just replicate a struct instead

[ruby parrot]

ye,he means this

[ruby parrot]

yeah, i tried to only have the variables i need to save in a file for future gaming sessions in one place...

[dire cradle]

Why do you need the save game replicated? Only the server needs to save it and it already has all the information about the game world

[ruby parrot]

well, how does the client know those variables ? 🙂

[dire cradle]

It's the server that does the loading, why would clients need to know

[ruby parrot]

e.g. i logged out with 67/100 mana.... if only the server knows, how can i return to this sttate when i close the game and then start playing again?

[dire cradle]

You'd have that variable replicated

[ruby parrot]

and thats what i tried 😄

[dark edge]

Your mana is a replicated variable, it exists on the server and is replicated to the client

[dire cradle]

When the server sets a replicated variable it's automatically sent to clients

[dark edge]

your savegame system should make a save slot or something to the effect per player

[dire cradle]

Are you pulling everything from a single save object during runtime?

[dark edge]

If the savegame is per player with the player ID being the slot name, then that can work. You can also have the savegame have an array of some data with an entry per player

[ruby parrot]

and thats exactly my issue, how doi get the 67mana variable from the savegame to the client,given that we just figured out the savegame aint replicated 😄

[dark edge]

you don't replicate the savegame itself

you replicate what the savegame loads data INTO

[dire cradle]

Yeah you only need to make a savegame when you actually want to save, like right before shutdown

[ruby parrot]

thats what it currently does

[dark edge]

no

is ChosenCharacter the PLAYER id?

don't confuse player and their pawn

Here's what your savegames should look like on the server
/Savegames/
TUGs
Adriel
Spynora

[ruby parrot]

yes, i save via charactername , so i got a tugs.sav file created

[dark edge]

Why is that an RPC?

What class does that code live in

I think the problem is that you're trying to replicate the savegame object

I don't think they can replicate

just have them wrap some structure if you must have a lot of data, but you really don't need to replicate the savegame data directly as a single thing, loading the savegame should have effects that are replicated on their own

[ruby parrot]

yes the number.sav is my steam ID...it basically only has a list in it with all characters i created with that steamID

so test.sav and tugs.sav are my characters i created so far

[dire cradle]

I think the problem is that you're keeping the save game alive and trying to use its variables during runtime

And it's an object and can't be replicated

[ruby parrot]

correct, reasoning was as stated above 🙂 only wanted to have one area that i have alll variables.... all that stuff here:

i assumed having a savegame already "made" would be better to,lets say just alter the mana variable and then save it,instead of "creating a savegame each time a change occurs".

[dire cradle]

Yeah, you need to keep those in the actor itself, or in an actor component or something, (that way you can also set them to replicate)

Only when you want to save and exit the game you need a save game

Save games are one time use objects, don't keep them alive

[ruby parrot]

so if i want to save the game every lets say 5minutes, i would let it create the savegame every 5minutes instead of just updating it and then saving it?

[dire cradle]

yeah basically

You don't need to save every time a variable changes

[ruby parrot]

i didnt want to 🙂 i wanted to save every time a quest progress has changed inside the savegame, but if health or mana changed it just keeps the 5min cycle.

[dark edge]

make a struct my guy

there might be some wizardry to make a savegame actually replicate but just make a struct

[ruby parrot]

heard you,will do that now, well..i was about to just do 1 variable, turning it into a struct after i can do myself easily.

[dark edge]

SaveGameObject
YourStruct
CharName
Mana
Hunger

PlayerState
YourStruct
CharName
Mana
Hunger

[ruby parrot]

you put all that in playerstate not an AC_Hunger system AC_ExperienceSystem AC_Resource(Mana,energy,rage)System?

[dark edge]

put it wherever you want

You can also do that like
SaveGame
HungerData
XPData
ResourceData

HungerComponent
HungerData

XPComponent
XPData

ResourceComponent
ResourceData

[ruby parrot]

im starting to get it 🙂

so.... if youre fine with it, lets do it step by step.... i have an AC_Experience connected to the BP_PlayerCharacter. in it i have a replicated variable called CurrentExperience. lets see how we get this from an AC_LoadingSystem that is connected to a PlayerController to said xp system? 😄

[dark edge]

SaveGameForPlayerID -> make save game object -> pull all the data from the players various objects and shove it in save game object -> save game to slot with player ID

LoadGameForPlayerID -> load game from slot into object -> spawn all the stuff for the player, shove data from save game object into the various objects like hunger component etc -> done

OnJoinServer -> LoadGameForPlayerID

[ruby parrot]

trying to implement this. ill try for an hour or two on my own with this as guidance, but its getting late here, would u be cool if id tag you tomorrow if i still have an issue with it?
and thanks @dire cradle of course too 😄

[oak pond]

was Skip Simulating Bones, tried Skip All Bones and it does this

interesting that when it teleports to 0,0,0 it actually goes back to where it should be

[elfin plover]

can you show the physics asset and the details panel for the root?

[oak pond]

this?

this is pelvis though, no physics body for the actual root bone

[fallen fossil]

Are pawn instances numerated different client and server?
I print GetLabelOrName() and it always prints Pawn0 for each player

[sinful tree]

The display name of objects can be different across clients.

[fallen fossil]

yes, it feels that way at least for starting pawns

[fallen fossil]

is there shared property that can help me identify actors or pawns across network ?

[sinful tree]

The reference to the object itself is the way to identify it across the network.

You really shouldn't need to worry too much about what the display name is. When you pass a reference to the server for example, the server will know which one you are talking about. When you set a variable with a replicated actor reference, then the clients will know which one is the right one.

You technically could use a replicated variable set on the server and assign an arbitrary integer value that you increment each time to any actors you're wanting to keep track of, and then you can use that replicated variable on clients to read that number to verify, but it's not really necessary.

[fallen fossil]

I have not used RPC with pointers yet 🤷‍♂️ so I have no idea

[supple cypress]

Does anyone know if mesh visibility can be client-specific for replicated actors? I had this working in 5.0, but no luck in current versions. I have checkpoints for a racing game that I toggle their visibility dynamically, via a client RPC. So in theory, its only the client-side actor that's being toggled. In my debugging, I can confirm that my execution chain is happening on the owning client (StaticMesh->SetVisibility seems to be working), but what I am seeing on screen does not line up with the object data, and it doesn't matter if I run as standalone, as listen server, or client.

Alternatively, I am thinking this is all too much of a hassle and I would be better off spawning new actors for visual indicators that are netrelevant only to specific players.

[kindred widget]

Use HiddenInGame if you don't want it replicated.

On Actors: HiddenInGame is replicated, and there is no visibility setting.

On Components: Visibility is replicated, HiddenInGame is not.

[supple cypress]

Thanks will try that

[supple cypress]

And it works!! You are a savior. I've wasted literal hours on this and it was 1 line of code to fix

Thank you!

[shut vigil]

Yo

I get an error

This error

In this level blueprint

but

ONLY if I run the game as a client

[supple cypress]

It's throwing an error because your playercontroller is null. Is this happening when you stop PIE?

[latent heart]

Maybe the Pc hasn't replicated yet?

[dire cradle]

Just add a check loop to wait for the player controller's spawn

level might be loading before the controller

ideally you dont want it to be the level that's spawning the ui but if you're just testing it's fine

[shut vigil]

Uhhh

how?

A do once?

then a branch?

[shut vigil]

ahhhhh

[dire cradle]

It'll just try every tick until the controller loads

[shut vigil]

Yeah yeah I see

but uhhh

it's

freaking out about this

[dire cradle]

just put another delay until next tick so it executes the next frame after the pc loads

it's most likely just a timing issue

This is creating problems because the level blueprint is not the place to spawn widgets

especially in multiplayer

[shut vigil]

Where should I do this then?

also if i put delay until next tick

it still gives the error

[dire cradle]

in the player contorller itself, or the hud

[shut vigil]

hmmmmm....

But how would I make sure that the player controller

or rather wait

Sorry no

How would I make sure that it only adds this widget in the main menu map?

cuz this is the main menu

[dire cradle]

Is your menu multiplayer?

[shut vigil]

no

the main menu is just what will eventually allow players to matchmake

[shut vigil]

and it ONLY does this error if I run as a CLIENT

[dire cradle]

Then don't, you don't need to test this map as a client if it's gonna be local only

[shut vigil]

oh shit wait

Your right 😭

Bro I was overthinking this so hard

@dire cradle thank you

I was overthinking this so hard lmao

[dire cradle]

lol we all do that at some point

[hexed path]

Do I need to add Steam_appid.txt into my shipping build game folder, before uploading the depot to steam?

Or will Steam do it automatically for anyone who downloads the game?

[dire cradle]

yeah you do need to put it in

[hexed path]

Same folder where the .exe file is in?

[dire cradle]

yeah

[hexed path]

Thanks!

[dire cradle]

After you release the game you no longer need the text file though afaik

[sterile gazelle]

how can I replicate a loaded sublevel on a listen server?

sending a multicast RPC fails: LogPlayerController: Warning: ServerUpdateLevelVisibility() ignored non-existant package

[tiny falcon]

is there an event you can run on clients when a uobject replicates? I tried PostInitProperties, PostLoad, PostNetReceive, and even an onrep but nothing works for triggering when the first replication happens. PostNetInit doesn't exist on uobjects. I don't want to tick through a boatload of maybe-existing uobjects every client frame :\

[fossil spoke]

What do you mean more specifically?

Are you looking for something on the Server side?

Or on the Client side?

[tiny falcon]

On the client side specifically, as in, a uobject successfully replicated to the client, therefore i want to run some code on that client within the replicated uobject

[fossil spoke]

Oh, so not an Actor?

[tiny falcon]

Yes not an actor

I feel like there has to be some way to process clientside that we just created some uobjects from the network system and respond to that happening, but i cant find one that works

[quasi tide]

UObjects don't really exist in a vaccuum. They're typically associated with an Actor. In the OnRep of the property for said actor, run your logic.

Replication happens through actor channels

[tiny falcon]

Oh that could work, but the critical thing is: if the property pointer in the actor, that points to the replicated uobject has replicated, is it guaranteed the uobject has successfully replicated too at that point in time?

Is it "safe" To do some operations (assuming that if the ReplicateSubobjects is already written properly to include everything) on the uobjects for the actor channel at that point in time?

[quasi tide]

I haven't bothered much with the replicate subobject stuff. So can't say for certain.

[tiny falcon]

Ok that gives me a starting point at least. worried i'll have to just have to keep looping every frame checking on the actor until the uobjects all load on the network, sounds painful both performance and architecture wise

[quasi tide]

The Actor's PostNetInit should run when all of its replicated variables have been received for the first time (if I recall correctly). So, if the UObject is a default subobject, and is replicated, it should be valid when that lifecycle method runs. (Don't hold me to it though!)

[tiny falcon]

uobjects seem to basically never be replicated/ready at the time the containing onrep triggers. The only option might be ticking until everything replicates, dang

[upbeat basin]

Is OnRep not working again when the object itself replicates? 🤔 Is that a TArray specific behavior?

[twin vessel]

There is IInterface_ActorSubobject which has two functions:
OnCreatedFromReplication and OnDestroyedFromReplication

[chrome bay]

They often wont be. The OnRep will be called multiple times as the object pointers populate/depopulate.

[chrome bay]

Unless the objects are subobjects of the actor itself, you have pretty much no garauntee they will be valid when that object replicates.

[tardy fossil]

oh man this confused the heck out of me for AttachmentReplication until i realized SocketName was getting replicated before the AttachParent pointer

[tiny falcon]

subobjects here means only defaultsubobjects right, so only constructor stuff? hmmm all the uobjects are outer'd to the actor who contains the array with the onrep so they are subobjects but not default subobjects, they are created during play with the actor as an outer, independent from the actor spawn time.

Do you have any reccomended method for where to run code to respond to a uobject replicating, such as "this item has appeared and is in an equipment slot, now apply the stats to the local copy of the actor"? Anything better than ticking and waiting for the references to be valid? 😅 I especially worry that, if an object is created on server and gets deleted more quickly than it took to replicate it, the client might be left ticking forever or something waiting to resolve something that never will. I suppose that if i check the whole uobject array every tick rather than ticking for just the one pointer, eventually the pointer will be removed but i worry about this solution too

[fallen fossil]

After possesing Pawn, what function is called afterwards on client side? 🤔

[dark parcel]

AcknowledgePossession

that's what I use to do client side stuff after possession

[chrome bay]

Before I attempt it, anybody know if you can specialise ShouldWriteFastArrayItem for Fast Array Serializer? I really wanna believe it'll work with all the template shenanigans

[narrow wadi]

Hi everyone! Network prediction is just awful: it’s a real nightmare for high-speed vehicles, and in multiplayer with a custom physics-based suspension system, it almost never works properly with prediction. Does anyone know any alternatives? I looked at GMCv2, but there’s no information or examples, and the Discord is locked until you pay ($600 — that’s insane).

[quasi tide]

$600 is definitely not insane for what you get with that plugin

[dark edge]

$600 is much much cheaper than someone who could make it would cost

[narrow wadi]

Thats the point) i don't know what i get with that plugin

[quasi tide]

The page tells you. It is a pretty good plugin.

[narrow wadi]

it fit or no

[quasi tide]

Also, it is fairly common for high speed stuff to be more client-trusted.

I haven't tried Chaos Vehicles stuff yet, so don't know how that is expected to be handled.

[dark edge]

I can't even begin to imagine the work it takes to have networked high speed vehicles with prediction

It's not too bad, until you have to handle inter-vehicle collisions

[narrow wadi]

speed not the biggest problem, suspension thats a problem

[quasi tide]

I'd imagine suspension is a locally derived thing. But I'm no vehicle expert, so /shrug

[remote tusk]

Hey guys, is destroying actors related with Relevancy? For example, if there is some loot, and Server destroys it after collected, and if the other client is far away, would that object still be destroyed on his Instance?

[dark edge]

Why is your suspension not local only? Who cares if everyone agrees on the fine details as long as everyone agrees on the general position and velocity of the vehicle

[blazing bear]

I just discovered that UUserWidget::NativePaint runs on both the server (non-dedicated) and client at the same time 😮 . I expected it to be totally local

[quasi tide]

It running on listen server makes sense though. Because someone is the server in that setup.

[blazing bear]

Though I've just realized that it only runs on the listen server and client at the same time when both PIE windows have the implementing NativePaint widget displayed (visible and on viewport), so I'm not sure if it'll still run on both machines in a real scenario when they're remote from each other

[near rapids]

What's the current state of networked vehicles? I'm looking to implement a variety (cars, tracked vehicles like tanks, helicopters).

• Chaos Vehicles from what i gather aren't very robust and have issues with replication?
• Chaos Modular Vehicles are in their infancy
• any standout plugins?

what would be the best approach as of now?

[grand kestrel]

I recommend waiting for Blue Man to complete his new plugin + wait for him to add net prediction 😄

There is nothing if you want a proper sim and don't want to rewrite CMC to produce arcade vehicles or have client authoritative movement

[near rapids]

thank you for the very quick answer. I'm not looking for physics accurate vehicles, the game vibe is pretty much the opposite of that xd

as for blue mans v2 plugin is there any release date insight or is it only written in the stars?

[grand kestrel]

Last he messaged me (recently), he was just waiting until he has time to do the docs, but net prediction isn't available on first release, i.e. planned for future update

[near rapids]

i've found his YT channel and in one of the comments it's targeted release date is in 1 or 2 months… that was a month ago

too bad about not having replication out of the box since that would be the selling point for me

[fallow bison]

It would only if you did a multicast for the item being destroyed. If it’s purely a server thing, the other clients won’t see the change

[ruby parrot]

@dark edge @dire cradle thanks for the help, changing to structs worked ...so far 😄 now I have to figure out how to display the replicated values into the UI.... I just dont get where to do that and when lol. but ill try to figure that out tomorrow on my own. imma ask tomorrow if i cant. for now just wanted to update and say thanks again ❤️

[dark edge]

Design it such that the UI knows about game state, don't make game state know about UI at all. It should never even have a reference to it.

either poll from the UI, or have a dispatcher that the UI binds to

[ruby parrot]

game state doesnt know anything about the information i want displayed though 😄

I have a HUD class that creates a user Widget called WB_PlayerUI wich looks like this:

[dark edge]

I mean game state in the general sense

not the game state actor

UI knows about the game, game doesn't know or care about UI

[ruby parrot]

yeah im aware of that already 🙂 server is dedicated most times anyway,so doesnt have a HUD class to begin with

Currently the order is:
Spawn Player_BP
Load data vom savegame and put it in the actor components attached to Player_BP
in Player_BP Begin-> cast to HUD class and call the "Show UI" function wich creates the WB_PlayerUI

and now i dont know how to get the UI to show the data 🙂 but I barely got the stuff working 20min ago from all the changes I had to make to get the new structs method working so ill spend tomorrow on that

[hasty rampart]

Hello! How can i get player controller of player who overlapped with trigger, i get the reference to played, but in need to disable his controls, haw can i do it in level blueprint?

[sinful tree]

Assuming the other actor would be a pawn or character, cast "other actor" to one of these classes, then you can use "Get Controller" from it and then cast that to PlayerController.

[mental rock]

Helloo i need help anyone can help me in this >>>> I want to add enemies in Lyra who will shoot at my Lyra character, reducing its health and eventually causing death. I have disabled bots, so I want to add enemies as regular AI characters instead. These enemies should behave similarly to Lyra bots—attacking when they see my character.

Additionally, my Lyra character should also be able to shoot at them. The enemies should only start shooting when they spot my character. If my character dies, it should respawn. Similarly, if any enemies have been killed, they should also respawn after some time.

[upbeat basin]

Would it be a bad idea to carry PlayerState's adding itself to tha PlayerArray logic from PostInitializeComponents to PostNetInit?

Or should I just create a different "player joined" event depending on the PlayerState::BeginPlay instead of GameMode::AddPlayerState?

[narrow wadi]

Our suspension local, we replicate only spring delta

[tardy fossil]

i dont suppose theres a way to increase the default NetCullDistanceSquared is there

[chrome bay]

Not without modifying engine

[tardy fossil]

dang, i guess i'll just manually set them lol

[hearty steppe]

Hi Guys, maybe one of you knows what I´m doing wrong? I´ve been trying for ages to get a local 2 player (multiplayer) project to work. I tried most online ressources/ tutorials (some paid ones too) but none of them feature my exact goal of locally having 2 different player blueprints. for now, all i want is for both players, who are different pawns (meaning they each have their own blueprint) to spawn into the level and be controllable via a shared keyboard. (WASD / arrow keys to move). this is my PlayerController blueprint: (P1 White is player1, P2 Azure is player 2)

when starting the game, this happens:

this shows that p2 (azure) is assigned controller 0, who is supposed to be assigned to p1

so i can only control player 1 (white)

and nothing happens when i try to press the arrow keys to move p2 (azure)

here to explain what´s getting printed on screen:

[thin stratus]

Iirc UE has no Shared Keyboard stuff by default.

Your PlayerController0 is getting the Keyboard. The other one is lacking an input device.

Btw you might want to move the input mapping stuff to the pawns blueprint. You can just tell each of them which player they are fwiw. Or pass the IMC they should use along when spawning them.

Then you don't have to check for the controller 0 stuff twice

Also, you are doing Online Multiplayer mixed with Local Coop, correct?

At least that's what it seems like. If this is a mix and not pure local coop, then you gotta make sure that you handle Authority vs Local Player properly.

Your delays are not a solution for that 😅

Your current setup would also cause clients to spawn their own local copy of the pawns and have duplicates.

[hearty steppe]

This is a pure local co-op. The delay somehow fixes some issue that apparently the imc p2 can't access the controller with ID 1 (maybe because at that point it doesn't exist yet? Idk)

[hearty steppe]

^

[hearty steppe]

Isee. That's a very useful input, thanks!

[hearty steppe]

Yeah i did that before i thought it might change something if i moved them to the playercontroller. I'll move them back to the pawns

Do u have any idea for a workaround for the shared keyboard?

[thin stratus]

Without c++, only really ugly ones, like having just one PlayerController and spawning two pawns of which one is not possessed and handling the inputs in the PlayerController and forwarding them

[hasty rampart]

Thank you, will try it! 🙂

[hexed path]

For my game's turn-based local multiplayer, I did the following:

Launch single player Standalone, use CreatePlayer node to create the additional players. In my case they all had PlayerControllers and Possessed Pawns.

When turn changes, SetViewTargetWithBlend to the Current Turn Pawn.
For the controllers, as suggested above, I forward the inputs. In my case there was no movement, just rotation, so inside the player controller I did Get CurrentTurnPlayer -> SetControlRotation on input.
For movement you would probably use the equivalent - SetMovementDirection, or SetMovementInput.

If you have different keys for different players (Example: WASD for player 1, Arrows for player 2), just use the above suggested nodes on the respective players from the corresponding inputs.

And yes, it is quite ugly. But works.

[twin sable]

I'm trying to save data for connected clients between sessions. will FUniqueNetId remain consistent for clients between sessions? epic's comment says "NOTE: the internals of this property should never be exposed to the player as it's transient and opaque in meaning (ie it might mean date/ time followed by something else)".

The date/time bit makes me wonder if some platforms add a new date/time every time they connect

[snow trail]

hello, are there any ripercussions or sideffects of having a higher bandwidth limit? i tested with 4 players and i was using around 100kb i think (which ik is quite a lot tbh, and ill try to optimize it)
im currently cranking the limits up to ensure i wont have issues but i would like to know if this can cause performance issues or anything else or if its just a limit and nothing more

[thin stratus]

Simply depends on the backend. Steam should stay consistent

EOS probably too

[quiet yarrow]

from what I heard the defualt settings are basically setup for mobile games. Its perfectly reasonable to increase these to your needs, but obviously you are increasing the networking needed to run your game smoothly

as far as performance, I'm not sure if there are any repercussions of this

[grizzled stirrup]

At least in UE4 the limits were extremely low even then so it is fine to increase them

[torpid crest]

https://dev.epicgames.com/community/learning/knowledge-base/5kwY/unreal-engine-tech-note-anim-notifies-are-not-fired-on-listen-servers has this been actually fixed?

I'm still having that problem using latest version

[normal viper]

Would it be valid to put Player State variable on every unit/building anything that player can ''Own'' to use as a Ownership variable and also for finding Player Controller of that Player State?

Like so, because Unit is Aactor, it's not owned by client, because it's owned by AiController. Because of that I cannot send RPC from it directly. So I first call normal event ''DoSomething'' to Player Controller of that unit by getting assigned Player State and calling Do Something on player controller for something to happen. Then that DoSomething event calls ServerRPC_DoSomething which does the thing.

Does it make any sense?

example

[hot scroll]

Network Level-change PlayerController Question
Have multiple gamemodes: GM_Login & GM_PlayLevel.
They have different PlayerControllers: PC_Login & PC_PlayLevel
Client starts on Level_Login with GM_Login and PC_Login. That gets some credential about that player.
Client connects to a server. That will initiate a level change and a game mode change.
Client is now connected to Level_PlayLevel with GM_PlayLevel and PC_PlayLevel.

What is a good approach for having the information I derived in PC_Login reach the Server and be associated with that player?

I thought that OnPostLogin's PlayerController reference would be of the previous game mode's PC, but it is the new PC.

[karmic trellis]

Hi, I have a problem about CharacterMovement & PawnMovement Replications on Listen Server project. On stabile times I always get 60 - 70ms around in clients -in live tests with dev build- with a good network and when I check profile network. the replicated locations and movements always seen on top replicated but its makes this pings itself so how can I decrease this ping?

Can this problem because of I m testing with Steam Develop app ID? 🤔

[thin stratus]

not really.

[thin stratus]

Did you mark the character as always relevant?

You probably shouldn't

Despite that the CMC in itself shouldn't be too expensive. You'd hit a CPU limit before the bandwidth becomes a problem afaik

[karmic trellis]

Ohh the stats decreased to 1/4.. It looks fine rn but I need test it with steam connection later. I I will write worked or not. Thanx for now 😃

[tender idol]

when to use always relevannt?

[fossil spoke]

Its not something often used. Typically used for things the Player wont see, but is integral to providing some abstract pieces of information.

The PlayerState is a good example.

Certain types of Managers are also another.

It also heavily depends on what feature you are trying to implement.

[tender idol]

interesting...i will need to read up further

[fossil spoke]

Just because something is Always Relevant doesnt necessarily mean its going to be expensive either.

[tender idol]

hmm?

i have 10 multiplayer characters with about 100 npcs... i chose to always relevant on the characters but maybe thats not necasssary... like you said it heavily depends on implementation

[fossil spoke]

Why do you think you need them to be Always Relevant?

[tender idol]

i have a large level and i was having issues with character far away... maybe it wasnt necassary... it ties into the relevancy distance settings right?

[fossil spoke]

Be more specific, what was the "issue with character far away"?

Was it something Cosmetic you needed to still see?

Like an Icon on the Character?

So other Players know exactly where they are?

Something like that can be solved by decoupling the "Icon" from the Character and allowing it to become Always Relevant instead of the Character.

When optimizing the Network, you should always consider, what is the approach that is going to send the least amount of data.

What is going to cost the least amount of CPU time.

While still achieving a satisfactory result

[tender idol]

intersting... goo dknowledge thank you

yeah it was mostly cosmetics... that makes sense to make the cosmetics themselves always relevant. if not "always relevant" the server still recieves updates?

[hot scroll]

The best approach I know of might be something like a GameInstanceSubsystem which has a longer lifecycle than a PC, but I don't need a long lifecycle.

I'm trying out temporarily storing it in static access classes' variable until I find a better solution.

My temp solution:
On PC_Login after it gets its credential, I store that to a static variable.
On PC_GameLevel I retrieve from the static class and empty that value. Then I re-store it in the PC_GameLevel variable which the server can access. Server then clears it once it got it in OnPlayerLogin

Is this a janky hack or a fine enough solution?

[fossil spoke]

You want to use the Options string

Clients can pass arbitrary data to the Server about themselves during connection via the Options

UGameplayStatics::OpenLevel(const UObject* WorldContextObject, FName LevelName, bool bAbsolute, FString Options)

See the Options at the end

This corresponds directly to

AGameModeBase::PreLogin(const FString& Options, const FString& Address, const FUniqueNetIdRepl& UniqueId, FString& ErrorMessage)

The Options on PreLogin and Login within the GameMode.

AGameModeBase::Login(UPlayer* NewPlayer, ENetRole InRemoteRole, const FString& Portal, const FString& Options, const FUniqueNetIdRepl& UniqueId, FString& ErrorMessage)

The GameplayStatics class has utility functions for interfacing with the Options string.

UGameplayStatics::HasOption( FString Options, const FString& Key );
FString ParseOption( FString Options, const FString& Key );

To name a few

As an example.

We use Options to pass the PartyId of a Player through to the Server, so the Server can know that a Player belongs to a certain Party. Allowing it to join each Client of the same Party together on its end.

if (UGameplayStatics::HasOption(Options, TEXT("PartyId")))
            {
                const FString PartyId = UGameplayStatics::ParseOption(Options, TEXT("PartyId"));
                if (!PartyId.IsEmpty())
                {
                    PlayerState->PartyId = PartyId;

Among other things.

The Options string needs to be in the following format.

[hot scroll]

Does this concept have a specific name? (Search engines for 'Options' isnt really a useful disambiguation for finding helpful docs)

[fossil spoke]

?Option1=Value1?Option2=Value2?Option3=Value3?....

[hot scroll]

This is exactly the sort of thing I hoped existed and couldn't find

[fossil spoke]

Its specific to UE

And not well documented

[hot scroll]

It looks like they're actually command line arguments under the hood?
Nope, guess not
https://old.reddit.com/r/unrealengine/comments/hxf25h/c_what_does_the_options_parameter_do_in_openlevel/
https://dev.epicgames.com/documentation/en-us/unreal-engine/command-line-arguments-in-unreal-engine?application_version=5.4

[fossil spoke]

They are not Command Line Args

They are literally just a string thats appended to the outgoing/incoming connection to a Server.

From a Client

To the Server

[hot scroll]

Huh, interesting

[fossil spoke]

It can be used however you like.

You could send information about the user selected Cosmetics or something.

?Head=TopHat?Chest=TShirt?Legs=Pants?Feet=Boots

[hot scroll]

This is super helpful, I'll try to arrange some time to reimplement to use the Options (which is probably better security wise than what I'm doing)

[fossil spoke]

We use GameLift as well, so when a Client Reserves a PlayerSession, we get that Client to pass its PlayerID along to the Server via the Options, so that the Server knows that the right Client joined the Reserved Slot.

Options can be used in whatever way you need them to be used.

You could even use it to preselect a desired Team or something

Client wants to be on TeamB instead of TeamA (maybe there is a preselection lobby before joining the actual Server).

Options are boundless.

[lament flax]

as a side note,
In UGameplayStatistics you have a few functions to read option values from a Options string such as HasOption, GrabOption.

you can get the Options string from GM and World iirc.
but irrc in one those class the variable isnt named "Options" but a synonym

[oak pond]

how is a characters aiming position usually replicated? like if youre aiming a weapon, and you move your mouse really fast then it should appear the same on the other end, but shouldnt be replicating this constantly, Im trying to update it based on the speed of the players mouse movements but not sure if I got the right idea

also dont even have a solid way of getting the mouse movement speed as a reliable variable Im doing it badly rn

tried looking that up but just get results for sensitivity

[dark edge]

Aiming usually goes through ControlRotation which is at least partially replicated through GetBaseAimRotation AFAIK

are you using ControlRotation to represent the aim direction?

[oak pond]

huh, I am but only for horizontal turning since I dont use horizontal aim animations, only vertical

should mention its third person so the character aims at where the cursor hit result lands

[dark edge]

Which one does ControlRotation represent?

the rotation from cam to aim point, or from char to aim point?

[cold temple]

Hi, I’m using player states to store team id, I have a problem where certain clients are unable to receive other player states on time, besides increasing the net frequency of the player states, is there a better way to solve this?

[dark edge]

how long is it taking?

[oak pond]

control rotation is just used to turn the character horizontally, wherever you turn the mouse

that doesnt do anything with the aim point

[dark edge]

There's a built-in replicated compressed pitch in Pawn

Typically that is used

it comes from ControlRotation, maybe you can manually set it or reformulate to use ControlRotation to represent the pawn -> aim rotation, or you can just roll your own

if it's just pitch just spam a pitch at the server and have it replicate it, skipping owner, but you already have that in Pawn

[cold temple]

Basically I need team id info of all player states for each clients to do something, less than a second I think

[dark edge]

I'd just turn up the freq a bit, it won't hurt

but I think there's a way to force replication instantly, problem is you'd have a race condition on join

[oak pond]

yeah thats basically what Im doing but every frame, that cant be a good idea

[dark edge]

sure it can

what do you think CMC does?

[oak pond]

well I was wondering actually

because I knew some things had to be replicated every frame but

[dark edge]

Other clients won't recieve it every frame but it doesn't hurt to unreliable rpc it to server every frame

but like I said, that can already happen

there already is a compressed pitch in Pawn

just use that

[cold temple]

Yup, ForceNetUpdate, is a race condition issue, I will try higher net frequency then, I was thinking of tracking the player states in each client before executing rest of the logic

[dark edge]

Yeah if you think about it, forceing a net update before the client is ready doesn't help you. Just put it on 10hz freq or something and call it a day. The amount of data in Playerstate is probably tiny

[cold temple]

Alright, thanks a bunch!

[oak pond]

I dont get it because its not about the camera angle its about the character mesh to the aim point

[dark edge]

Doesn't matter, it can be about anything

it's just a number

but it's the number that's already there, already replicated, and typically used for exactly waht you're talking about

Instead of:
input -> ControlRotation -> camera -> aim point -> look at rotation (the char to aim point rotation)
you can:
input -> camera rotation -> aim point -> look at rotation -> control rotation
Then it'll automagically work, GetBaseAimRotation will have a replicated pitch for you

but you can also just replicate AimPoint or AimDirection or AimRotation or AimPitch or whatever you want on your own

[oak pond]

so its essentially the same thing in the end

[oak pond]

come to think of it I guess Im making the mistake of thinking any server/multicast event is bad, when really its about how much youre actually sending through those isnt it

[fossil spoke]

You want to send the minimal amount of data across the Network that you can manage such that you get the result you need.

Key points there:

• Minimal Data
• Desired Result

If you are adhering to that then nothing is "bad"

Using an RPC for something isnt inherently "bad".

So long as its the absolute cheapest way for you to get the desired outcome.

[oak pond]

well I just assumed that sending any event every tick would be a horrible idea but if its just one variable then I dont know

[dark edge]

Is it important that everyone knows about the aim direction continuously and smoothly?

[oak pond]

well kinda? player interaction is important, its a very noticeable thing

if anything Id like some way to see how good the connection is and what makes it worse

[dark edge]

Just use the network profiler and look

this is a total nothing burger, there's way more data than that already crossing the network

[oak pond]

well thats what I was hoping

its just Im often being asked why I use event tick ever

[dim trail]

Is there a way I can log RPCs through a console command or see how many are being sent?

[dark edge]

You're asked that by people who don't know what they are talking about

Tick is the event that you hook into to do stuff per frame

lots of stuff in a game needs to update per frame

if the thing is updating per frame, something somewhere is ticking

[verbal ice]

Unreal Insights should be able to do it for you

or this https://dev.epicgames.com/documentation/en-us/unreal-engine/using-the-network-profiler-in-unreal-engine

[fossil spoke]

Not really, thats what the profiling tools are for.

[opal pulsar]

is the game state promised to be replicated and up to date by the time a client spawns in?

[fossil spoke]

Depends on what you mean by a client spawns in?

The GameState is replicated when all Actors have BeginPlay called on them.

Its literally what calls BeginPlay

[opal pulsar]

I mean replicated values on the game state

say the game state had a value that dictates how the game is played, similar to lyra experiences, would this be up to date for all clients by the time begin play is called as a promise or just guess work

[verbal ice]

unmapped ones yes

https://dev.epicgames.com/community/learning/knowledge-base/ba80/unreal-engine-replication-ordering-guarantees

Not guaranteed that the game state will have called rep notifies in begin play

but the (unmapped) properties will be there on the frame it gets created

[opal pulsar]

ok ill read that and see what unmapped means in that context. thanks.

[verbal ice]

non-UObject properties

This goes for any replicated UObject, all of their replicated properties that don't map to another UObject are guaranteed to be available on creation

[opal pulsar]

*guaranteed *? Even if I had an array of like 2mb? Thanks that makes sense though, I assume guaranteed within reason

[verbal ice]

You're guaranteed to get an error saying you can't replicate over 65kb of data per bunch in that case

[tawny parcel]

I'm trying to get the socket location to cast an ability on an AI Enemy in a dedicated server setting. I've gotten this to work on the player by setting the mesh to "Always Tick Pose and Refresh Bones".

But so far, this same setting doesn't work for AI Enemies. Is there a way to enable this through an option?

[open wave]

i have done a build on my game and when i launch the EOTAServer.exe -log I get a window come up but no logs on whats going on i left it over night yet nothing was there in the morning

[flint scaffold]

hello
im having an issue where when i change the game state from game state base to game state my character gets stuck and i can only move the camera(not like moving in the editor but where my character is at only) i tried making a new game state base and it worked just fine but making a new game state the issue repeats it's self again and i can not move.

[tawny parcel]

if its a shipping build you have to add

bUseLoggingInShipping = true;

in your Server.target.cs

[unkempt tiger]

I keep thinking how player states and controllers should actually be one object, am I missing some key insight?

i don't really understand why they are two distinct actors, when both are some 'player info' actor that represents a player