multiplayer

[pallid mesa]

move ur ass then @fathom aspen 🤣

[cold moat]

please don't shoot me

[pallid mesa]

aighty so... you know hud is local already

you can get the local controller I think using "getowningplayer"

[fathom aspen]

Setting owner for widget is optional, but it's good practice to set it if it relates to that player

[pallid mesa]

correct

[cold moat]

you gotta understand I work on japanese factories so when I can use the computer my brain is already on 2%

[sinful tree]

The owner should always be the local player. You can't set the owner in online multiplayer to other player controllers.

You can still pass in a reference to the PlayerState or PlayerCharacter that you need to reference.

[pallid mesa]

so if you want to

[fathom aspen]

Don't mix up OwningPlayer with Owner actor because they are two different things

[pallid mesa]

display a "you won" message in your hud

usually you'd throw a client rpc to the controller from your gamemode

then from the clientside controller you can forward it to the hud

[fathom aspen]

2019 vibes

[pallid mesa]

in which u can create the widget ~

[cold moat]

Oh, gotta remember this, didn't knew about it

[fathom aspen]

The latter is vital to understand when you can RPC for example

And when you use replication conditions

[cold moat]

This is also very good to remember

[fathom aspen]

But all that is irrelevant when we talking about a local class like HUD/UserWidget

[cold moat]

I appreciate your help, a lot, been trying but for some reason I still cannot do it, when playing as clients I receive errors and when I play as "server" with a few clients, every event I call from the widget applies to the "server" player UI, don't know why

I'm giving up for now, got sad with it, but I'll try again tomorrow

[cold moat]

Leaving a better written explanation before going to bed, tested a lot because I really want to fix this. Playing as server makes it work normally, I made a print on the "get hud" node results and the hud class is there normally.

Though, playing as a client alone, the print does not bring anything, like if there is no HUD class there, empty string on the print, but why wouldn't the HUD class be there? In this case, I receive errors as there is no HUD class to get from the "get hud" node.

If I play with both client and server open, and I take damage as the client, the server UI loses damage, which to me doesn't make any sense since the HUD class is local, how can the UI be shared... No errors on this case though.

I don't know if this makes any sense, I hope the explanation is a bit clearer

[fathom aspen]

Good but we still haven't seen your updated code

[cold moat]

Oh my bad, I wrote that on mobile, I'll take the screenshots tomorrow after work

but again I appreciate a lot

thank you for taking your time to help me

[fathom aspen]

Are you using IsLocallyControlled on BeginPlay in character

Because that was what I suggested and I want to step back and say that it's not reliable

There is a possibility that the pawn hasn't got possessed yet so IsLocallyControlled will yield false

[cold moat]

not anymore, I moved the widget creation to the hud class so on the character itself I'm just casting to the hud class to call events

[fathom aspen]

Then I have to see the full context and where you're trying to access HUD to find that it's not there

[cold moat]

I'll update to event dispatchers when I get it working though, to make it more modular

I'll make sure to take nice screenshots asap

[fathom aspen]

Have fun time at work

[plush otter]

hello, got an urgent issue. Solved thanks

[simple crow]

if I set two replicated properties on an actor with on_rep functions in a specific order, Are those properties always replicated in that same specific order?

[fathom aspen]

When it comes to order guarantees, the best guarantee you can get is they replicating in the same packet. If you are asking for more than that then you're asking for violence

But take it with a grain of salt, order depends on how you layout your properties inside GetLifetimeReplicatedProps

First being those up top

And ofc that's for non UObject* types

[simple crow]

i see, thank you!

got another question! 🙂 I see that SceneComponent replicates its attachment state by default. Is there a way I can override this if i want to have a scene component that has a different attachment component on local vs remote clients? AKA i guess not replicate this property?

[fathom aspen]

I'm not sure I get the question. Can you link me to the replicated property in question?

[dark edge]

The UI is not shared. Make your HUD/UI such that it doesn't even know or care about anything networked.

You're probably doing some Get Player Pawn 0 magic in there

[fathom aspen]

Idk if it's just me, but I get hyped every time I see Ethan is typing

[simple crow]

{
    Super::GetLifetimeReplicatedProps(OutLifetimeProps);

    DOREPLIFETIME_WITH_PARAMS_FAST(USceneComponent, AttachParent, SharedParams);
    DOREPLIFETIME_WITH_PARAMS_FAST(USceneComponent, AttachChildren, SharedParams);
    DOREPLIFETIME_WITH_PARAMS_FAST(USceneComponent, AttachSocketName, SharedParams);
    DOREPLIFETIME_WITH_PARAMS_FAST(USceneComponent, Mobility, SharedParams);
}```

i find this in scene component, so im assuming if i set functions like "AttachToActor" etc on a server event, that those properties would be replicated

without me doing anything else

but in my case, im trying to attach a weapon to either a First person arms mesh, if locally controlled, or a third person mesh if viewing from a remote client, similar to something like CS or COD (im assuming)

[fathom aspen]

If AttachToActor changes any of these properties then yes

But as you said if you want attachment to happen for autonomous proxy only then use IsLocallyControlled (else being remote proxies aka simulated)

"Turning replication off" for these properties isn't what you're looking for. Not from the sounds of it at least

[simple crow]

yea i might be thinking of it the wrong way.

    if (Rep_AttachmentOwner) {
        ARedTideCharacter* RedTideCharacter = Cast<ARedTideCharacter>(Rep_AttachmentOwner);
        if (RedTideCharacter) {

            if (RedTideCharacter->IsLocallyControlled()) {
                FAttachmentTransformRules AttachRules = FAttachmentTransformRules::SnapToTargetNotIncludingScale;
                this->AttachToComponent(RedTideCharacter->GetPlayerFirstPersonArms(), AttachRules, "WeaponSocket");
            }            
            else if (!(RedTideCharacter->IsLocallyControlled())) {
                FAttachmentTransformRules AttachRules = FAttachmentTransformRules::SnapToTargetNotIncludingScale;
                this->AttachToComponent(RedTideCharacter->GetCharacterThirdPersonMeshComponent(), AttachRules, "WeaponSocket");
            }
        }
    }``` This is what I came up with based on what you said

time to test 🙂

[fathom aspen]

else if (...) else

[simple crow]

yea 😄 well I ran into some strange problems probably related to something else LogNetTraffic: Error: ReadContentBlockHeader: Client attempted to create sub-object. Actor: BP_RedTideCharacter_C_0 LogNet: Error: UActorChannel::ReadContentBlockPayload: ReadContentBlockHeader FAILED. Bunch.IsError() == TRUE. Closing connection. RepObj: NULL, Channel: 3 LogNet: Error: UActorChannel::ReceivedBunch: ReadContentBlockPayload FAILED. Bunch.IsError() == TRUE. Closing connection. RepObj: NULL, Channel: 3

it kicks my client out of the PIE server

[fathom aspen]

What is Rep_AttachmentOwner? How do you get it?

[simple crow]

{
    // Set ownership for the weapon.
    SetOwner(FromActor);
    ARedTideCharacter* RedTideCharacter = Cast<ARedTideCharacter>(FromActor);
    if (RedTideCharacter) {
        Rep_AttachmentOwner = FromActor;
        OnRep_AttachmentOwner();
    }    
}```

Server,Reliable function called from my Player Character

[fathom aspen]

If Rep_AttachmentOwner is already casted to your type, why do you cast it again? (Not that it's related to upper issue)

[simple crow]

OCD maybe 🙂 Im saving the variable type as AActor but im only doing so if its a character

too obsessed with abstraction maybe

[fathom aspen]

I would trace this issue to see where things are going brrr

https://forums.unrealengine.com/t/destroying-dynamic-replicated-components-causes-client-connection-loss/363274

This might help

[simple crow]

thanks so much ill look into it

[fathom aspen]

You can check my answer to the follow-up question which I just posted

[simple crow]

nice! i noticed 🙂 Im just having a bit of trouble actually tracking down which function of mine is actually causing this problem

[fathom aspen]

You can start by break pointing the error log and looking through the call stack

[simple crow]

yea the call stack is just showing me this

im gonna look at it with fresh eyes tomorrow, thanks for all your help, at least i have some stuff i can track down. I am trying to do a lot of dynamic component spawning and stuff, i must be doing something wrong somewhere

[cerulean juniper]

Hey guys, I've been thinking
"in a multiplayer game, widgets communication should be done by the character or the controller?"

[fathom aspen]

Widgets don't hold state, so they don't need to communicate

But if they do then that's HUD

HUD is what (should) manages widgets

[cerulean juniper]

I see, interesting! Never thought that way

But anyway, who is supposed to send player data to the HUD though?

[fathom aspen]

Whoever the HUD needs to display the data for

Health? Pawn
Score? PlayerState

[cerulean juniper]

Got it!

thanks man

[ivory wolf]

So I've fixed this problem:
#ue5-general message
by using CharacterMovement -> SetVelocity on OnWalkingOffLedge event, but while is it's not replicated on client, it's also somehow gets overriden on the next ping (I guess) even on server. Player owned by server works fine, but the players owned by client not, which is strange as I assume that since it's server authoritative, all players running on server should run the same logic. Is there something I missed that I should check to make the client players works like server's player?

Here's a picture to describe the problem, red is player owned by client, and green owned by server

[tranquil swallow]

Hey guys! I'm back once again. Right now i'm working on a multiplayer game and I'm having an issue replicating the control rotation of a player (looking up and down and affecting torso) to clients. Right now it shows the player rotating from player-->server but not back to others.

Here is some of my messy method in my animbp

Please ping me if you have any ideas!

[warped hawk]

Hi, is the process for setting up dedicated servers for android games the same as that for desktop applications, or there are some other configurations/steps needed.

[thin stratus]

The Server itself, running on Windows or Linux, should be the same setup

[thin stratus]

ControlRotation is incorrect here. Use BaseAimRotation.

That one is already replicated, so no need for the RPCs

[woeful ferry]

Hi,

I'm spawning a level in runtime, the replicated actors don't get spawned on client due to bNetStartUp is set to true because they're spawned in from a level.

If I set them to bNetStartUp to false, nothing is happening. How do I assure these loaded actors get also spawned for the client?

[gusty raptor]

Hi, anyone uses advanced sessions on UE5? I updated my plugins but its not working in packaged game 😕

Anyone knows there's any documentation for UE5 & Advanced sessions maybe?

[thin stratus]

Can you disable NetLoadOnClient for those actors?

[fathom aspen]

If there are, they will probably be in #online-subsystems 📌

[dark edge]

Are you doing RPCs in your anim BP?

[gusty raptor]

Ah well, seems only shipping builds do not work, the rest do. (Just in case anyone wanna know)

[woeful ferry]

Nope, doesn't seem to do the trick 😦

If I spawn an actor with a template from one of the replicated actors, it works

But then references to that actor will not work. I can maybe name them the same name, so softptrs will still work

[twin juniper]

Hi! Question regarding autonomous proxy

i have a listen server setup, and it seems that movement on client (autonomus proxy) is just a little bit stuttery

are there any variables regarding the movement of the autonomus proxy that i could be playing with?

i'm working with blueprints only

[full tree]

CharacterMovementComponent

also you can debug it with p.NetShowCorrections

[twin juniper]

@full tree any idea what needs to change to make corrections less frequent?

[full tree]

If you have default setup it should work like a charm, need some details

[twin juniper]

i have defaults, but i don't like how smooth my autonomous proxy is. it's just barely noticable, but i want it perfect

i have wsad movement via "add movement input"

[full tree]

so playing as client is shutters your movement?

how you test it?

[low helm]

the fields at the top and bottom of this you should start with I think

[twin juniper]

i test it on two computers

[full tree]

if the ping is low, and it shutters even without hardcore button smashing check server fps. Also debug correction are not visual shutters just a signal that move is corrected and interpolated

[upbeat basin]

I was expecting a client's player controller on client to be Role=Autonomous Proxy | RemoteRole=Authority and on listen server to be Role=Authority | RemoteRole=Simulated Proxy. However it's Role=Authority | RemoteRole=None.
Similarly I was expecting listen server's player controller to be Role=Authority | RemoteRole=None. However it's Role=Authority | RemoteRole=Simulated Proxy
It feels like.. remote roles should have been reversed. Am I missing a point here? Or are they simply reversed?

[full tree]

Only server can see Role=Autonomous Proxy as client dont replicate actor to the server

[upbeat basin]

Where is that being seen?

[full tree]

roles are reversed depending on where you check it, for example Server checking his controller will see Role=Authority and RemoteRole=Simulated Proxy because is simulated proxy for all the clients but when client check it form his perspective roles are reversed

because for client there is only server (no other clients)

[upbeat basin]

So is the RemoteRole getting a set union of the actors role on other devices?

I get that roles do get reversed between server-client viewpoint. But it's not exactly reversed in the example I gave, that's the point can't get my head around

[full tree]

I make mistake, not controller, Pawn*, client don't have any other controller than his

[upbeat basin]

That's why I was expecting the listen server's controller to be RemoteRole=None, while it's being RemoteRole=SimulatedProxy. Like where does it being simulated at?

[vague spruce]

Hi i am making an mmo and have a couple of questions, Do i need a manager to handle data persistence and to handle the creacion y destruccion of multiple instance of a server?, also i need a online session for the server?

[open quail]

Is there an unreal way to graceful finish a dedicated server? just closing the dedicated server works fine but it looks a bit forced on clients, I'm thinking of taking all the player controls and notify them of them being kicked out i guess.

[vague spruce]

Like??

[fathom aspen]

Wdym? I made my own mmo in 23.4 hours

BP only

[fathom aspen]

Have you checked latest message in pins?

data persistence is somehow close to persistent data

[fathom aspen]

OnLogout gets called when that happens, you could take advantage of that

[vague spruce]

just saw it, thx

[fathom aspen]

Don't get too confused with roles as long as you know how things are being controlled. On Listen-server instance all actors have a LocalRole of authority, Remote isn't that useful (whether none or simulated)

[open quail]

hmm yeah i use onlogout, but i meant more like

void ShutdownServer(){
for all players{
player.NotifyExit();
}
FGenericPlatformMisc::RequestExit(false);
}

i can just do an rpc to player controllers, but was wondering if there was another way

[full tree]

It is just a role set this way, doesn't mean that is simulated/existing anywhere else

[fathom aspen]

You can do that. You already have AGameMode::Say

[kindred widget]

There is an override you might make use of. I don't remember which exactly, but one of them handles the client being kicked back to a default main menu when disconnected. You can override this and not force them back immediately so that you can display a message easier.

Default is just to boot them back to main menu and display an error message.

[open quail]

oh wow, that one was new to me

[kindred widget]

Only issue with Say is localization. It doesn't handle it well since it can only pass a string. Might be possible to FName that and do a table lookup for localization though.

[timid moat]

Hi!

I'm trying to develop a multiplayer game. The players have a Blueprint Widget above their head with their name. When I change it in one player, the other player doesn't seen the change. Any advice?

Thanks!

I think I have to change the name at server, but how do I run a blueprint node on server?

[open quail]

from reading the code there's also BroadcastLocalized which seems to handle that situation i think.

but for my purposes say works fine

[fathom aspen]

The name is already a replicated property in PlayerState, set it, inside OnRep set the repped down property to the widget component

[timid moat]

repped? Sorry, it's the first time I do this.

[fathom aspen]

#multiplayer message

[woeful ferry]

How does the server and client link up the bNetStartUp actors?

[fathom aspen]

via package name iirc

they are stably named

[woeful ferry]

Hm, can I manually link them somehow?

[fathom aspen]

Yes if you deterministically name them the same on all machines and override IsFullNameStableForNetworking to return true and make sure bNetLoadOnClient is also set to true

But again that is if you are spawning them dynamically. If they are being loaded from package they are already stably named

[woeful ferry]

Hm, alright. I'm still trying to get replicated actors work with my level instances.

Because I want instance changes to come with the actor too. I could respawn all replicated actors, and it works

But the instances changes will not work then

Like changing a static mesh on one actor in its instance

[fathom aspen]

I'm not sure what you're talking about

[woeful ferry]

I'm spawning levels dynamically that has replicated actors inside of them

And they don't link up if I load the same level on both server/client

https://docs.unrealengine.com/4.27/en-US/API/Runtime/Engine/Engine/ULevelStreamingDynamic/LoadLevelInstance/

[golden zealot]

Hey can anybody tell me why

IOnlineSession::GetResolvedConnectString 

is used? I mean what does it do?
I understand blueprint node of Join Session.It takes SessionResult and I get it. But why do we use above one?

I mean does it gives the address of currently joined session or of session whose name is passed as argument?

[woeful ferry]

Oh wait, I maybe found something

[fathom aspen]

Have you read this?

[woeful ferry]

yea, just read it haha

It works now

Guess I need to head home from work

[fathom aspen]

I used it lately (https://forums.unrealengine.com/t/passing-options-trhough-join-session-node/660087/9?u=wizardcell) as a workaround to passing an options string to JoinSession node

[fathom aspen]

Currently joined, but it should be same as passed

[golden zealot]

Thanks!

[golden zealot]

Hey can anybody tell me what is bAllowJoinViaPresence ?

[pliant coral]

Hi! I’ve been told that behavior trees are a better way to handle my ai logic for an RTS game (currently written in blueprints). I’m confused as to how I do this with my multiplayer setup.

How do you pass the behavior tree logic to the server so it can execute the commands?

[fathom aspen]

It means if your session is publicly visible to be joined iirc

But that's more of a #online-subsystems question

[golden zealot]

And what does bUsesPresence does?

Does it makes all the players playing in that session to show their presence to all of the players?

[fathom aspen]

BTs are already run on server, at least that's how they should act. Reason being they are run by AIController which inherently server-only

It's not any different from how you would do it in SP. Pawns move, they got CMC attached, they simulate the same to all clients

I would suggest you learn BTs first before you do it in MP

[golden zealot]

which are logged in?

[golden zealot]

If I set it to false then will it be invite only right?

[fathom aspen]

Probably. This is not the channel for OSS and session questions fwiw, the channel for that is #online-subsystems

[golden zealot]

ok thanks!

[pliant coral]

Thanks! That’s probably why I couldn’t find any information on my question. 🤦‍♀️

[outer sphinx]

Hello people, how are you? my name is Lucas, I'm new to unreal engine I wanted to ask you if you can give me a hand in connecting the database with the game and the web (for user registration and more). If you know what documentation or courses I can see to help me, please tell me. Thanks a lot!

[fathom aspen]

(I'm fine, glad I could help)

[pallid mesa]

TIL attachment + root motion = bad

[fathom aspen]

Was it root motion?

[pallid mesa]

the combo

[tranquil swallow]

Will take a look at that when I get home

[tranquil swallow]

RPC?

I think I know what you mean but mind explaining

[fathom aspen]

Remote Procedure Call

Adriel meant to say that RPCs can't run in AnimBPs

As they are not actors

[fathom aspen]

While you get home, enjoy that it works

(You're welcome™️)

[tranquil swallow]

So run it through my player, and get the rotation from a variable in my player?

[fathom aspen]

No. What you're looking for is BaseAimRotation as Cedric suggested

[tranquil swallow]

Alright I'll look into it

Thanks for the help!

[dark edge]

@tranquil swallow Your animation system shouldn't know or care about networking

It looks at LOCAL data and outputs a pose.

Same with your UI.

[tranquil swallow]

Gotcha

[dark edge]

In your case you either want to use BaseAimRotation or replicate a rotation yourself.

My game is top down so I literally don't have vertical aiming so I haven't had to do it.

[tranquil swallow]

I was planning to do a top-down but I instead went towards a tps because it's more in the environment

wish I stuck with top-down lol

[proven fog]

When a match starts via AGameMode::StartMatch, and the GameState is notified, are all instances of GameState notified?

[fathom aspen]

When OnRep_MatchState() fires for each and every one of them they do

[proven fog]

That method fires every time that the MatchState values changes, right?

[fathom aspen]

And that the match state's local value is different from the server's

[proven fog]

How should I tell actors that the match has started?

I created a delegate and broadcasted it in HandleMatchHasStarted but that doesn't seem to work

[grizzled stirrup]

Yeah each actor would subscribe to a delegate in the GameState, what's not working with it?

[proven fog]

Oh, the delegate belongs to the GameMode, do I just need to move it to the GameState?

[grizzled stirrup]

GameMode only exists on the server

So actors would only run the callback there

I have a replicated MatchState enum in the GameState that brodcasts the delegate in the OnRep function call

So everyone can respond locally when it changes

[fathom aspen]

Delegates are local only, they are not RPCs

[proven fog]

But GameState::HandleMatchHasStarted will run on every machine, right?

[fathom aspen]

Yes, including server

[golden zealot]

Hey, what is the difference between presence and normal session?
I can't wrap my head around it.

[grizzled stirrup]

I believe presence is just relating to joining via friend menus say in steam "join in progress" whereas the session is the actual multiplayer game session that you are in

[golden zealot]

I meant to ask, what is the difference between session created with bUsesPresence set to false and another session set to true?

[grizzled stirrup]

I believe it just means players can join via the steam menus and can advertise "Playing Team Deathmatch" while in a game (all visible to other players from the Steam menu itself)

[solar stirrup]

https://github.com/EpicGames/UnrealEngine/pull/9507

That was fast

[minor topaz]

Hey Lucas 👋 I'm doing something similar and I haven't found many useful tutorials/docs, and none that would answer your question in one go.

Your question doesn't give a lot of detail but at a super high level - you can connect to a database using C++ (for security, only do this in types that only exist on the server, e.g. GameMode or GameSession, unless you aren't sharing the game with anyone else). That's basically my approach except I've added a HTTP server between the game server and the database. I don't know if there's any plugins which would let you do any of this in blueprint.

Once that's working you can read/write to the same database the UE server is using from another application - e.g., from a web app where users can sign up in a browser.

But imo it'll be far easier/quicker/safer to use Steam unless you have a strong need for doing something else.

[outer sphinx]

Hello Penthesilea, thank you very much for the help. I would love to do it through steam but my work group told me that it is impossible, the registration in a web application has to work.

[outer sphinx]

I did the web too, it only has a frontend, I still haven't done anything on the backend, it's spa. Thanks, Laura

[fathom aspen]

Wait they tweak Character and PC too much? darn.

So those are good news to me (tho I don't give an F about the BP part)

Honestly I thought it wasn't that stable for MP, but you proved my thoughts wrong

Wow, that's more than I (or any indie team really) would ask for 😄

Thanks for the forbidden knowledge tho, now I'm in a much better spot!

GenMovementReplicationComponent hmmm

[proven fog]

Are there any replication issues / complications with putting logic in an UActorComponent? Or important considerations to make?

[fathom aspen]

Logic no, replication yes

Replicating ActorComps adds a NetGUID of 4 bytes and a footer of 2 iirc

Pretty much why Epic ended up moving all their CMC RPC calls to the Character

But that's a heavy ActorComp so don't take it as a general practice

[grave fog]

how to restore player information like his name and how much money he has after he delate the game and re install it later on android ?

[fathom aspen]

SaveGame for easy mode

But ideally you want a backend service

[proven fog]

Is optimization wrt replication generally important for a multiplayer game of five players? Or are games of that size generally small enough that it doesn't matter?

[fathom aspen]

Net Insights would know better. Profile and judge it yourself

[grave fog]

how to restore player information like his name and how much money he has after he delate the game and re install it later on android ?
I want the player can sign in to his account with another mobile ?

like signing in with google acount

[fathom aspen]

#multiplayer message ?

You want to make your own database where you save data for clients against some unique identifier, in Unreal it's called UniqueNetId

I would suggest you start looking the terms up rather than keep asking the same question again

[grave fog]

dude not all people pro like u

I am here to learn more

[fathom aspen]

I don't know if that's a compliment, but I'll take it as one.

And I'm here to explain.

You literally asked the same question again without replying to any of my messages so it seemed like an ignorance from your side

[grave fog]

@fathom aspen thank u 😄

I am new with unreal

[fathom aspen]

Welcome, hope you a cool learning journey!

[dim trail]

im storing my setup data in a data table, should i keep it on the server only?

[fathom aspen]

If that makes sense to your game then sure

[quartz smelt]

@fathom aspen I see you here a lot, but wanted to say thank you for always helping out the newer people. It's really awesome seeing that 👍

[dim trail]

wouldnt that be prone to hacking i suppose

when i say setup data, i mean stuff like lists of all the items, abilities, etc

[fathom aspen]

Good to hear I'm being helpful. Hopefully I don't get blocked for that

[fathom aspen]

Usually you want to ask yourself who has authority over that object.

If that's the server, then it's a server-authoritative. Usually being replicated and managed by the server.

[dim trail]

would it make sense to have two data tables, one on the client and server. one for checking and another for validation only

[fathom aspen]

~~Butbutbut... I'm not ☣️ ~~

[sinful tree]

No

You only need 1 data table.

It doesn't matter if players change the data on the client side, so long as all calculations regarding any item data is done on the server.

Eg. You can have an item that has a "damage" field set to 5. If a client changes that field to 500, it shouldn't matter as the server would be the only one reading the damage value when actual damage is calculated and changing the data table value client side wouldn't effect the server.

[dim trail]

that makes sense, ty

[fathom aspen]

I don't know what that is, I'm busy buying NFTs

[tranquil yoke]

When server is replicating an Actor, where does server save it to replicate ?
how does server know i have to create another client ?

Is it possible I can share SnapShot of the server (All Replicated Acotrs, Clients ) with other Server so it can mimic what first server is doing ?

Like if something is spawned on Server1 , it should be like spawning it on Server2. so clients connected to server1 and server2 can see the spawnedObject exactly at the same place ?

[ivory wolf]

hi, is it normal for a client's character to jitter and out of sync when the Character Movement -> Max Acceleration is too big, I set it out to 10000.0 currently (default is 2048.0) . I need the character to move without acceleration (instantaneous) and turning off Requested Move Use Acceleration doesnt seem to work (it still accelerates)

[twin juniper]

what could be the reasons for low client fps compared to listen server which works flawlessly?

[thin stratus]

Isn't there a boolean to just force max acceleration?

If you need something custom then you will have to override CalcVelocity on your own CMC

[ivory wolf]

Yup, there is, I think it's [Requested Move Use Acceleration] but unfortunately it doesnt work, it still accelerates

[thin stratus]

RequestedMoveUseAcceleration is AI stuff

The bool is called bForceMaxAccel

And it seems to not be exposed to BPs

void UCharacterMovementComponent::CalcVelocity(float DeltaTime, float Friction, bool bFluid, float BrakingDeceleration)
{
    // Do not update velocity when using root motion or when SimulatedProxy and not simulating root motion - SimulatedProxy are repped their Velocity
    if (!HasValidData() || HasAnimRootMotion() || DeltaTime < MIN_TICK_TIME || (CharacterOwner && CharacterOwner->GetLocalRole() == ROLE_SimulatedProxy && !bWasSimulatingRootMotion))
    {
        return;
    }

    Friction = FMath::Max(0.f, Friction);
    const float MaxAccel = GetMaxAcceleration();
    float MaxSpeed = GetMaxSpeed();
    
    // Check if path following requested movement
    bool bZeroRequestedAcceleration = true;
    FVector RequestedAcceleration = FVector::ZeroVector;
    float RequestedSpeed = 0.0f;
    if (ApplyRequestedMove(DeltaTime, MaxAccel, MaxSpeed, Friction, BrakingDeceleration, RequestedAcceleration, RequestedSpeed))
    {
        bZeroRequestedAcceleration = false;
    }

    if (bForceMaxAccel) // <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
    {
        // Force acceleration at full speed.
        // In consideration order for direction: Acceleration, then Velocity, then Pawn's rotation.
        if (Acceleration.SizeSquared() > SMALL_NUMBER)
        {
            Acceleration = Acceleration.GetSafeNormal() * MaxAccel;
        }
        else 
        {
            Acceleration = MaxAccel * (Velocity.SizeSquared() < SMALL_NUMBER ? UpdatedComponent->GetForwardVector() : Velocity.GetSafeNormal());
        }

        AnalogInputModifier = 1.f;
    }

    /** Ignores size of acceleration component, and forces max acceleration to drive character at full velocity. */
    UPROPERTY()
    uint8 bForceMaxAccel:1;    

So you'll need a C++ Child of the CMC

@ivory wolf

[ivory wolf]

Nice, I'll check that, thanks 👍

[plush wave]

Not sure when I should be using FUniqueNetIdPtr vs FUniqueNetIdRef vs FUniqueNetIdRepl

[thin stratus]

Most of the time you probalby use the Repl version

That's also exposed to BPs iirc

[weary tangle]

Since multicast delegates are more often used in mp, maybe I can ask here 🙂

I have a multicast delegate with 1 str param named Foo.

When I want to sub to the delegate, I want to: Foo.Add(OnFoo)

void OnFoo(const FString& Result)
{
}

However, I'm definitely missing something. Maybe like TBaseDelegate<OnFoo> or SOMETHING like that missing?

[grave fog]

create session Node if I set use lan to true . do other players cant join?

I mean network players

[thin stratus]

Multicast Delegates and Multicast RPC are two different things. This is not at all multiplayer relevant?

[plush wave]

Interesting

Does the ==operator work for that wrapper? I can't really tell.

[thin stratus]

Why wouldn't it

[plush wave]

Well because the wrapper could contain ref or a ptr beneath it

Looks like from the code it should work

But why have the FUniqueNetId be opaque in the first place?

Should there ever only be one per exact ID match?

OSS seem to return FUniqueNetId directly not the wrapper

And sometimes they return FUniqueNetIdPtr

[chrome bay]

Because there are specialisations of it depending on what platform your on, and they aren't compatible

The USTRUCT wrapper types exist so you can at least pass it around reflected code

[plush wave]

So whenever I get one I should just wrap it in FUniqueNetIdRepl and move on?

[chrome bay]

Depends what you want to do with it I guess

[plush wave]

But the point is just initializing a wrapper should be safe for most cases?

[chrome bay]

Should be fine AFAIK

So long as the source is valid ofc

[eternal pumice]

Hey guys, so I have a server rpc in the player controller which calls a multicast rpc and sets the location of a replicated actor. But the location change does not seem to get replicated to the clients. Weirdly enough, the multicast rpc runs only twice, even when I have 3 players in the session. The actor has its bReplicated attribute set to true, I can't really guess whats going on.
`void APlayerControllerBase::EquipWeaponServer_Implementation(class AWeapon* WeaponToEquip)
{
ReplicateEquipWeapon(WeaponToEquip)
}

void APlayerControllerBase::ReplicateEquipWeapon_Implementation(class AWeapon* WeaponToEquip)
{
// set WeaponToEquip's location
}

void APlayerControllerBase::EquipWeapon(class AWeapon* WeaponToEquip)
{
EquipWeaponServer(WeaponToEquip);
}`

I even tried setting the actor's location on server, but even that wouldnt work

[latent heart]

The player controller is only replicated to the owning client, so calling a multicast on a PC will just send it back to the client that sent the server rpc.

You should send the rpc broadcast on something everyone has, like a game state or player state - or even just the weapon itself.

[eternal pumice]

ah ic, thanks for the help, I'll try out your solution

[latent heart]

The proper place to put it might be on your pawn/character, tbh.

However, you should attach it on the server and let it replicate...

(Or do that and send an rpc... can't hurt)

[eternal pumice]

right, thanks a bunch for the help, I'll try out this as well

[static flare]

If I have a ServerRPC that alters a replicated property and then instantly sends a MulticastRPC to all clients, can I somehow guarantee that the RPC is received by the client before they receive the replicated value?

[chrome bay]

negative

RPC/properties arrive independently

[dark edge]

Smells like a job for RepNotify

[latent heart]

That's all well and good if you aren't hoping to send extra parameters.

[dark edge]

Ya I would do one or the other. Either replicate or RPC, not both.

[static flare]

@dark edge but.. it can't hurt? 🥲

[latent heart]

Hey now, that's a different thing entirely! 😄

[chrome bay]

tbf RPC for weapon equip is weird anyway 😄

[latent heart]

Depends on what you're doing. What if you want to send this rpc once (or once in a while or on specific events) but the variable itself changes/replicates a lot?

[chrome bay]

I think the problem in this case is it sounds like one is depending on the other getting there first, which is the prob

[latent heart]

Totally.

You could send the current value of the variable in the rpc and then use that value instead of the client value.

Just in case things have gotten there in the "wrong" order.

[dark edge]

What's the actual mechanic? What are you trying to do here

[latent heart]

And what data is being sent in the multicast rpc?

...if any.

[chrome bay]

GAS has a workaround for this kinda thing but it's ofc very specific

[split siren]

Hopefully super-quick question. I have a map specific replication graph which according to documentation should be created by bounding the creation process to UReplicationDriver::CreateReplicationDriverDelegate(). What would be the correct place to do binding to this delegate? Source - https://docs.unrealengine.com/4.27/en-US/InteractiveExperiences/Networking/ReplicationGraph/

[chrome bay]

Game instance perhaps?

[static flare]

Yah, this is unrelated:)
I am performing a "transaction"(struct) on a shared inventory. I was hoping to avoid keeping a local shadow ledge of transactions, and rather just pass my transaction to Server without updating my own UI, and make the server Multicast the transaction if it's valid, so that everyone can reflect it in UI immediately (including me). But I still need it "Replicated" for new players, and as a safe-guard against rogue transactions going bad.
So the plan was

1. Client->Server "do this transaction"
2. Server: Checks transaction
3. Server->Multicast "do this transaction"
4. Client does transaction
5. Client receives replicated result at some replication-time.
   But I guess it doesn't make sense. I've just experienced replication/OnRep to be too slow to reactive UI.

[split siren]

Would constructor of GameMode be a good place? Or does client also need to know about this override?

[dark edge]

I wouldn't multicast the transaction, just the state

[chrome bay]

Well, RPC isn't going to make it any faster because they'll still be delayed. The property will obviously be later still if you have a low net update frequency, you can call ForceNetUpdate() to get around that somewhat.

[dark edge]

Can't you just predict transaction, Server RPC transaction, then let server do it and replicate state?

[chrome bay]

That's the "easiest" way, in a sense.

Send an ID to identify the transaction. Either you receive an RPC that says "failed" and client removes it, or you receive a replicated update and can "ack" it

[dark edge]

Other clients don't need to see your bank statements, just your balance, so to speak

[chrome bay]

I do my AI command system like this also

Works ok

[dark edge]

You can probably just do a forced replication even if it doesnt change serverside (say the transaction fails serverside), although idk if that'd trigger an onrep to refresh UI

[chrome bay]

It wouldn't but ticking UI ftw 😄

[dark edge]

Or include timestamp in your replication so it has to update lmao

[static flare]

Yeah, the thing is, the transaction is smaller than the balance, so to speak. Faster to send. And I was going for speed, as people may edit the same inventory at the same time..

[chrome bay]

Well if that's the case, screw prediction then

[static flare]

This is the smartest solution, but I didn't really want to backtrack transactions

[chrome bay]

If you've got lots of clients messing with one container prediction isn't going to help much

That method above is essentially how GAS prediction works in a nutshell, but even GAS doesn't let multiple players predict actions on one target

[static flare]

True.. So my best bet is replicated content? I didn't know I could force a replication, so I'll try that.

[dark edge]

There are diffing replication containers

[chrome bay]

You can't force a replication. ForceNetUpdate() is badly named, all it actually does is reset the "last time I sent an update" time

So unless a property has actually changed, it still won't replicate

[dark edge]

Timestamp it is then

[chrome bay]

Classic UE API naming

Yeah, or increment a counter or w/e

[static flare]

Right, but when used right after a change, it'll practically work as a force?

[dark edge]

I mentioned it for the case where nothing changes

a failed transaction

[chrome bay]

It just means that the object should replicate at the end of the frame. It's really only there for actors which have a really low net update frequency by default

[dark edge]

If you predict an item move but the server disagrees

Honestly I wouldn't bother with prediction tho especially if you need multiple players involved

[chrome bay]

But IMO, if you've got multiple clients interacting with one container - you really are just going to have to live with the latency

[dark edge]

plenty of games don't predict

Makes it simple, RPC the transaction, then just let the repnotify do the thing

or plain old replication if you're ticking UI

[static flare]

Allrighty, I'll give that a go. Thanks guys 👍

[timid moat]

Hi!

I'm calling PlayerState::SetPlayerName from Blueprint and it doesn't call OnRep_PlayerName. I have created a custom PlayerState class. Any idea? This is how I call it from blueprint (it's inside Blueprint Widget):

Thanks!

[timid moat]

It doesn't run the OnRep_PlayerName because GetNetMode() returns NM_Client(3). So, I think, the problem is to execute a blueprint node on server. But, I don't know how to do it.

[chrome bay]

OnRep are only called on Clients in C++

Blueprint OnReps are a meme

If you mix the two it'll cause a lot of confusion

Oh incredible, Epic bypasses that in C++ for this one particular case. Even better.

SetPlayerName() needs to be called from the Server anyway to have any effect

[dark edge]

It's basically the same problem as a 3-way crash in a vehicle game. Pure hell from a prediction standpoint.

[timid moat]

No. I'm not calling OnRep on Blueprint. This is why I have shared the blueprint code, to show you that I'm calling SetPlayerName. As you can read, later on, I've noticed the problem is to run the blueprint code on the server.

[chrome bay]

Yep, you're calling it from a widget - which is only client side. Set Player Name needs to be called Server-side to have any actual effect

But stupidly, the function is not marked as authority only.

[shadow aurora]

What is the best way for me to sync a "timer" on a HUD for all players? At the moment I'm repping down a value that is the total timer amount (i.e. 60s) PLUS the ServerWorldTimeSeconds. Then on the clients, OnTick I'm subtracting the ServerWorldTimeSeconds from that value that was repped down. Despite this I'm still seeing some desync of a few seconds between various clients.

[steady cape]

Default GameState's ServerWorldTimeInSeconds seem to be somewhat unreliable unless you crank up the update rate by a lot

[quasi tide]

https://vorixo.github.io/devtricks/non-destructive-synced-net-clock/

[steady cape]

In this message, guy says they wrote a better one. This one is pinned, so I have no reasons not to trust them
#multiplayer message

[cold moat]

@fathom aspen @dark edge Hey again, regarding the UI issue I had, I was working today and snapped on my mind the solution to my issue. What I didn't thought that day we were discussing, is that the On Damage event on my game is networked, so it would be always called on server, that's why clients couldn't find the UI class, because it is local only and you cannot grab from others such as the server, where it was trying to.

Although I noticed this and now know that I just have to call it locally instead of inside a "run in server" event, I noticed I have no clue on a nice way of triggering it outside of server. Since my game is networked, enemies attack between getting damaged is all networked, and I'm not very sure to call something locally when functions all run on server. Do you have any suggestion?

[eternal lake]

You can force replication with the push model though, can't you?

[chrome bay]

Nah, same deal

Server never sends anything to the client if it doesn't think it has to

[dark edge]

Are you trying to have UI show health or UI do damage number or event popups?

[eternal lake]

oh of course all you're doing is marking the property as dirty

[cold moat]

UI show health

I know I can just bind the variable on UMG but I have a brush/material and I'm setting inside a parameter of this material

[chrome bay]

yee. Server will compare it, but may still not send

[dark edge]

Then the UI just shows the health. It knows and cares nothing about whether or not there is a server

Are you managing UI through PlayerController or HUD?

[eternal lake]

Makes sense - bandwidth is very limited after all

[cold moat]

but in order to show the health difference I have to run the event or function from the UI when the player is damaged somehow

[cold moat]

HUD, made some events to trigger when stuff happen and apply differences on the UI

[dark edge]

Onrep_HP or just poll the HP value on tick in the widget

either way

polling is probably less trouble until you have a LOT of UI

[chrome bay]

tick eryting

UI ez mode

[cold moat]

but isn't on rep server side?

[dark edge]

Do you know what onrep / repnotify is?

Just poll

How much UI do you have? On the scale from Mario to EVE

[cold moat]

yeah, value changes then call function repnotify

[dark edge]

So in the repnotify, tell your UI to update

or don't and just poll/bind

[cold moat]

I love the comparison here lol I would say in the middle

I don't have much UI but I have information about players, status basically

[cold moat]

this will probably be safer for me for now (as I'm dumb)

when you bind stuff you can't usually change the binding in runtime right?

[dark edge]

Binding is just a function that runs all the time updating values

You can program it however you want

[cold moat]

Oh that's why it can get heavy with a lot of stuff?

[soft relic]

hey guys, any ideas why the client wont connect to the local host server while the server is clearly running on port 7779 too? Could game state instead of game state base parent class cause this issue?

same happens with default 7777 port too

[fathom aspen]

Yes. Health won't change on tick. Also read this: https://benui.ca/unreal/ui-best-practices/#dont-use-bind-variable

[cold moat]

Oh, hey there!!! Thank you so much, I'll read it right now :D

[fathom aspen]

You would probably want to look through the client logs too

[soft relic]

not much there besides a timeout

Or maybe its that "ControlChannelClose"

[dark edge]

WHat if it does change on tick tho

regen etc

I just bind hp and call it a day, especially if it's constantly moving

It won't change on tick in Mario, but it will in Dota or WoW

[soft relic]

Binding anything to UI is in general a bad approach, ideally you use rep notify variables, call a dispatcher on the update, make your UI listen to that dispatcher and update the visuals. Keeping anything possible off tick and UI binds is the best approach @dark edge

[cold moat]

I doubt it will ever change every tick

[fathom aspen]

That still doesn't mean the property should be checked if changed on tick

[cold moat]

even WoW life regen has a slow change of health

[fathom aspen]

Maybe if you breakpointed that and traced your way up then you could get a slight idea of what is happening there

It happens inside UChannel::CleanUp

[soft relic]

how would i do that?

[fathom aspen]

You would breakpoint that line and look at the call stack

[soft relic]

from the engine code?

[fathom aspen]

Yes

[cold moat]

The UI changed on client 1 now, on 2 it did not weirdly, client 2 got damaged and changed client 1 UI's, is the local controller different on each client as I'm playing on the same computer with two games? Two games on local connection?

Also tried with only 1 client running, it worked fine but there's a lot of errors, I think server is still trying to run the code even on client somehow (on this situation I should use authority remote?)

[still arch]

Is there something like AcknowledgePossession() on AAIController? Initializeing my Blackboard for an AI controller in OnPossess() and I guess I need to do that for all clients as well.

I guess OnRep_Pawn would work?

[fathom aspen]

It does, but AIControllers are inherently server-sided

Trying to access AIC on client won't help you if that's why you trying to do

[fathom aspen]

Doesn't hurt to share with us what you did 😛 (code-wise)

[still arch]

Nah, I just assumed I would have to Initialize the blackboard on clients as well but maybe not?

[cold moat]

Good idea, just a sec

[fathom aspen]

I haven't done AI stuff in a while, but I'm not sure if that's safe or if that is something you would want to do

I mean you can always replicate AICs but that comes at a cost

[cold moat]

On the HUD class, I create the widget normally

On the character status component, I created a function to get the HUD and the sub-widgets such as player status

then on the health rep notify I call the events to play with the UI (change amount and color)

the events though are simple and just play with my material parameters

That's all I done for now with UI, nothing much

[fathom aspen]

Let's start by fixing things step by step

[fathom aspen]

GetOwningPlayerController instead of GetPlayerController(0)

[fathom aspen]

GetController instead of GetPlayerController(0)

Try not to use the evil GPC(0)

[cold moat]

Hm so even though it is local, we shouldn't use the GPC(0)?

[fathom aspen]

Yes not even local, because there are always other ways

[cold moat]

Okay! With GetController you meant the Pawn node GetController?

[fathom aspen]

Right

[fathom aspen]

Now to explain why you're getting errors. OnRep health fires on all proxies (autonomous and simulated) - autonomous is the only proxy that has the local controller, simulated guys sadly doesn't have any

[proven fog]

Do I make a method NetMulticast if I want to call it from the GameMode, and have it run on every machine?

[fathom aspen]

GameState*

GameMode isn't replicated so it only runs there

[proven fog]

But wouldn't NetMulticast cause the method to be called on every machine?

[dark edge]

On every machine that the Gamemode exists on, which is exactly 1

[proven fog]

I mean I know you're right lol I'm just curious why NetMulticast isn't the answer

[dark edge]

the host

[fathom aspen]

If the actor was replicated, and relevant to every connection

GameMode is neither one

GameState is both

[dark edge]

@proven fog

[proven fog]

The Character class has an inverted translucent cylinder which acts as a fake fog, so I only want it to be visible to the owning player. (Sorry, I should have started with context).

[fathom aspen]

Is that a component?

[cold moat]

The Get HUD node needs a Player Controller though hmmm

[proven fog]

Yeah, just a UStaticMeshComponent

[fathom aspen]

You have SetOwnerOnlySee

[still arch]

Is what info I've found correct, CMC does not replicate flying movement out the box, I need to add movement and handle this myself?
What I'm doing is using a BT to MoveDirectlyToward.

[dark edge]

https://docs.unrealengine.com/4.26/en-US/BlueprintAPI/Rendering/SetOnlyOwnerSee/

[fathom aspen]

Cast it to one

[cold moat]

Oh sorry, meant to reply this one

[proven fog]

Ahhhh, I thought that was only for skeletal meshes. It makes more sense that it wouldn't

[fathom aspen]

Yeah, it becomes a MovementMode and you add a flag to the CMC that gets translated to a SavedMove and here my knowledge ends.

[fathom aspen]

Same answer still apply

Cast Controller to PlayerController

Check the video pinned in this channel, might help you with that @still arch

[still arch]

Alright, will do that! As always, thanks 💪

[fathom aspen]

Are you trying to replicate UI health widget?

[cold moat]

Nope hm

[fathom aspen]

Because it seems like you're trying to replicate UMG widget changes and that's not viable

You would instead use a Widget Component

You are clearly accessing PlayerControllers on simulated proxies and that doesn't work

[cold moat]

But how exactly? Nothing on it is replicated 🤔

[fathom aspen]

Explain to me what you are trying to do

[cold moat]

I have the player UI, I want to put it on screen and use it, to be honest this is all

[fathom aspen]

Replicate health changes via UI to other players is what I guessed and you said no

[cold moat]

At the moment I don't want to show other players status, just getting the basic main player (the one playing) would be fine

[fathom aspen]

Amazing

You have two options

1. Replicate health variable with OwnerOnly condition

That way other players won't know about your health tho

2. Use IsLocallyControlled inside that OnRep

[cold moat]

I think this one fits better

How to use it on components though

I tried parent but it didn't work

[fathom aspen]

GetOwner -> cast it to Pawn -> IsLocallyControlled

[fathom aspen]

And just to double check you have the replicated health property on the component?

[cold moat]

Yeah, is the component for Status & States, I also use it on enemies etc

[fathom aspen]

You know that component has to be replicated right?

[cold moat]

Oh, yeah yeah, it is

I'm sorry for my poor english btw

[fathom aspen]

It's okay, I mean who likes English language after all

[cold moat]

About this part.............

I still get so lost with node types on UE

how can be "target is HUD" if I'm using it to get hud

GetController does not connect to GetHUD and GetController is not a HUD object to connect with GetOwningPlayerController

[fathom aspen]

GetOwningPlayerController was meant for this one

[cold moat]

Yeah sorry, I just tried before asking to be sure

[fathom aspen]

For the second it's GetController

But considering you're doing it from component so you have to go another step and do GetOwner

You can do GetOwner 2 times and cast to PC 😄

[dim trail]

if i call a client method within an RPC, is that potentially hackable?

for example, if i have a method that heals a player based off a skillid, and i call a method that heals the player within the RPC, is that ok?

if the method that heals is on the client

[fathom aspen]

If that's a server RPC then yes and healing is done server-side

Health is a state, state change is done server-side and replicated to clients

[timid moat]

How can I make to force a blueprint node to run on server?

Thanks!

[fathom aspen]

To run it through an event that has the potential to run on the server, or to run it through a server RPC

[timid moat]

Thanks

[cold moat]

Sorry I was AFK for a while

what you mean by GetOwner 2 times

[pallid mesa]

you can get the owner of the owner

[cold moat]

yeah but for what exactly? getting the owner of the owner still doesn't allow GetController to connect on GetHUD, I'm not sure where to use it

Using GetOwner after GetController makes an actor pin

[fathom aspen]

GetOwner->GetOwner->Cast to PlayerController -> Get HUD

[cold moat]

can you explain to me why though? I'm not doubting I just want to understand how it works xD

[fathom aspen]

Components owner is usually the actor they are attached to, which is Pawn in your case. Pawn's owner is Controller they are possessed by usually

[sinful tree]

If you read the error message it tells you why. The input pin on the node says "Self" which is a reference to the current blueprint. Then it says "This blueprint (self) is not a HUD" and the node itself tells you what the expected target is.

When inside of an actor component a "Get Owner" node like below would return whatever actor the actor component is attached to. So if you had this actor component attached to the player controller, the return value would be the player controller, but in its generic "Actor" format, meaning you'd have to cast it to player controller to be able to use the "Get HUD" node.

If the actor component is attached to your controlled pawn, the owner of said pawn is your player controller. So if you get the owner of the Actor Component (The Pawn) and then get the owner of the The Pawn (your player controller) you then have a reference to the player controller, but again, only in "actor" format, so you'd need to cast to use the Get HUD node.

[fathom aspen]

If I only had Datura's energy to write like that, I would write 3 blog posts per day 😔

I'm still gonna give you🥈

[magic helm]

If I had energy to write 😫

[fathom aspen]

It gets even worse, when you have no energy to work

[magic helm]

Done, what's next

[fathom aspen]

Sleep, work, repeat?

[magic helm]

Can you tell what this "sleep" is? I only know the other two

Actually at this point ending the conversation so this channel may stay on track

[pallid mesa]

bruh x'D
yet proceeds to write one of the bests slate-umg compendiums 😄

[plush wave]

How Can I tell if a UniqueNetId belongs to a local player?

[fathom aspen]

Find its corresponding PlayerState, then PlayerController and check if IsLocalController?

[magic helm]

Said I don't have the energy, doesn't stop me from writing

[vagrant grail]

How to have your hand handle a lamp torch and being seen by others handling the torch too ? (first screenshot is phasmophobia)

I succeed doing this but somehow my lamp torch is flashing for some reason and also there's no hand on the screen https://gyazo.com/a53f5dacc99e0a6eca3006091a409fd2.mp4

[sinful tree]

Use some kind of enumerator variable that keeps track of what is in the player's hand. Set it so it is replicated w/ notify.
When you want to change what appears in the players hands, set the variable on the server. The OnRep function will trigger when the variable is replicated - use the value that is replicated to swap/spawn whatever actors and attach to your player as needed, and set whatever is needed for the animation state to show the hand holding the item.

If you want a hand to appear, you probably need a first person model and animations that only shows on the owning client.

[vagrant grail]

For now I have this

[vagrant grail]

Where can I get the unreal mannequin first person hands ?

[sinful tree]

Probably the first person template.

[vagrant grail]

And how to get the hand place correctly with the torch ?

[sinful tree]

Mess around with it?

Animations?

Not my department XD

[vagrant grail]

Oh 😄

[fathom aspen]

Not that it's this channel's department. #ue5-general will either help you or switch you to the correct channel

[vagrant grail]

Already tried in #ue5-general and my message got burried because of multiple people needing help and other channels are kinda dead

[fathom aspen]

Doesn't make it legitimate to ask here tho 🙂

Try again in a while

[quartz smelt]

Quick question for ya, sometimes a server that's been created isn't destroyed, and it's still running even tho the host has the game closed. To fix it I have to manually close something with task manager (something something packaged.exe I forgot the name)
Is there a reason why?

[fossil spoke]

Is there any sort of debug view that visualizes how often RPCs are being called?

[fathom aspen]

Network Profiler?

https://docs.unrealengine.com/5.0/en-US/using-the-network-profiler-in-unreal-engine/

[fossil spoke]

Ah yeah, i forgot about that one.

[obtuse field]

Hi, I have a question. Is there a way to make player travel between servers without lag? If I use "OpenLevel" or "TravelPlayer" the player get lag, and then its teleported to the new server, is there a way to avoid this lag, to e.g. let player move in the meantime?

[dark edge]

No. Well, it's one of those "if you have to ask..." type questions. It might be technically possible, but nobody here can do it or has done it.

[crude coral]

unreal 4 dedicated server crash when using MeshMergeFunctionLibrary for the main character? when i try to connect locally to the server it crash cause of that

[grave fog]

how to handle if the server disconnected on listen server ?

[sinful tree]

Technically it is possible, but you'd have to not use unreal's networking.

[chilly patio]

do you really have to go into C++ if you intend to have more advanced movement options?

[twin juniper]

Hi! I'm troubleshooting micro jittering of my autonomous proxy in a listen server setup

I was suggested to enable p.shownetcorrections

can someone take a look at the video and say if this is normal or am i facing some issue?

https://www.youtube.com/watch?v=F2nAIbJETGs

[twin juniper]

I'm also getting a lot of these

[2022.11.11-07.20.55:879][910]LogNetPlayerMovement: Warning: *** Client: Error for Khaimera_C_0 at Time=223.362 is 2.025 LocDiff(X=1.996 Y=0.342 Z=0.000) ClientLoc(X=-1080.883 Y=1476.642 Z=202.150) ServerLoc(X=-1082.880 Y=1476.300 Z=202.150) NewBase: MainMap1:PersistentLevel.Landscape1.LandscapeHeightfieldCollisionComponent_20 NewBone: None ClientVel(X=79.498 Y=13.608 Z=0.000) ServerVel(X=63.399 Y=10.850 Z=0.000) SavedMoves 3
[2022.11.11-07.20.56:010][915]LogNetPlayerMovement: Warning: *** Client: Error for Khaimera_C_0 at Time=223.465 is 2.000 LocDiff(X=1.972 Y=0.337 Z=0.000) ClientLoc(X=-1077.128 Y=1477.284 Z=202.150) ServerLoc(X=-1079.099 Y=1476.947 Z=202.150) NewBase: MainMap1:PersistentLevel.Landscape1.LandscapeHeightfieldCollisionComponent_20 NewBone: None ClientVel(X=41.373 Y=7.078 Z=0.000) ServerVel(X=21.563 Y=3.689 Z=0.000) SavedMoves 4
[2022.11.11-07.20.56:137][920]LogNetPlayerMovement: Warning: *** Client: Error for Khaimera_C_0 at Time=223.622 is 2.517 LocDiff(X=2.481 Y=0.425 Z=0.000) ClientLoc(X=-1076.296 Y=1477.427 Z=202.150) ServerLoc(X=-1078.777 Y=1477.002 Z=202.150) NewBase: MainMap1:PersistentLevel.Landscape1.LandscapeHeightfieldCollisionComponent_20 NewBone: None ClientVel(X=13.383 Y=2.292 Z=0.000) ServerVel(X=0.000 Y=0.000 Z=0.000) SavedMoves 3

So i'm wondering is my jitter somehow connected to this client error

[thin stratus]

It's not normal

Way too many corrections

Are you changing the walk speed runtime?

[twin juniper]

nope

could it have something to do with collision?

it seems when the character jumps, than the drawing stops

[twin juniper]

Actually im changing the speed at runtime, but only once or when an item is picked up

If that matters

[untold citrus]

Hey guys,
Im trying to implement voice chat system on my project with dedicated server, but im not finding any good doc references or tutorials to implement it.
Can anyone share or help me with this topic.
any lead or insights will be highly appreciated.

[silent valley]

We evaluated the built in voice chat system a couple of years back and found it just wasn't very good. It also uses your server bandwidth.
We ended up integrating Vivox which has been flawless.

The other option would be EOS voice chat but I think that's a bit more involved

[plush wave]

Ok so after creating a session, how do I actually get the session

It just gives me the name?

[torpid girder]

Hello, just wanted to check i understand things correctly, there will be one game instance on all instances, dedicated server and client, they are separated and not shared, replicated etc and the same would apply if i created a game instance subsystem?

[chrome bay]

correct - it's local only

and every machine has one

The same is true to all subsystems, they have no networking support. If you want some kind of networking, the solution is to spawn a proxy actor that communicates/interops with it. My advice is to leave that purely to world subsystems however.

[torpid girder]

i don't want any, i was going to make a game instance subsystem that pulls in the configuration, which i would update clients by rpc call, or as you put it a proxy actor

thanks 🙂

[timid moat]

Hi!

I want to learn unreal engine networking. Do you recommend me a good tutorial/book to start with? Yes, I've read the UE4 Network Compendium from Cedric, but I don't understand anything. I learn better with examples or with Cookbook.

I've googled "learn unreal engine networking" there are a lot of videos and I don't know where to start from.

Thanks a lot!

[regal geyser]

I have a small overlap capsule in front on character, if any other character overlaps it, he will get pushed to the side.
Currently I'm using Add Force on CMC (inside Tick), but how do I do it so it's synchronized, without network corrections?
Do I need to Add Force on both server and client? Or just on Server? Or having synchronized Add Force is not as easy as that?

[chrome bay]

The problem is all clients are in different frames of time reference. The local client is ahead by RTT / 2, all other clients are behind by your RTT / 2 + their own RTT / 2.

So you can't really have different clients bumping into each other without some kind of correction, it's impossible to avoid

[regal geyser]

Yes that's what I was worried about. Because currently I'm stuck on resolving issues with characters colliding with each other, which will prevent them from moving (if they don't hit their sides, in this case the just slide around each other), first I thought just adding another small capsule collision just for pawns is going to be good, but CMC only works with the root capsule collision, which is used for environment, where I don't want characters to get too close to walls, etc. And removing collisions completely with other pawns is not very visually appealing.
So then I just thought that I will push other characters away, but corrections would be painful 😅.

[chrome bay]

Ultimately so long as the local client is predicting ahead of the server, there are always going to be corrections - but every game with prediction has that problem. You could try to "solve" it before it becomes a problem, like biasing the characters input to "steer away" from other players locally, without actually using collision.

It's not perfect ofc, but at least avoids issues with corrections etc.

[chrome bay]

yike

[proud jewel]

Hi guys,
Can we create multiplayer on listen server model and integrate EOS without using unreal Engine source build?

[crude coral]

MeshMergeFunctionLibrary (for merge skeletal meshes into one character) causing dedicated server crash when client try to connect...anyone experienced this issue?

[gritty lantern]

Is it possible to replicate a UObject without having it be owned by something? The problem I'm trying to fix is I want to pass an object as a parameter through an RPC function, and the object is a pointer that can be polymorphic - maybe this can be done in a different way so I'm open to suggestions

[chrome bay]

negative

If it's a runtime object, it has to be a sub component of an actor. Assets, or other stably-named objects can be referenced however, but cannot replicate properties.

The alternative is to use structs instead of objects

[gritty lantern]

but you can't pass structs as pointers through an RPC right?

[chrome bay]

No, but you can create a "wrapper" struct which serializes the data into raw bits

The EZ mode way to do it, is to merge this PR: https://github.com/EpicGames/UnrealEngine/pull/9280 - and use an FInstancedStruct

[timid moat]

Hi!

I want to learn unreal engine networking. Do you recommend me a good tutorial/book to start with? Yes, I've read the UE4 Network Compendium from Cedric, but I don't understand anything.

Any advice?

Thanks.

[chrome bay]

That's was exactly my use case though, sharing RPC's/functions for different raw data

[gritty lantern]

we aren't set up to compile from Engine yet 🥲 but when we are, I'll definitely request for that to be added. Thanks!

[chrome bay]

You can merge that PR without an engine compile, you can move the plugin out of the engine into your project directory and modify it there. Epic are (apparently) taking that PR in 5.1 though hopefully, so I'm told

[gritty lantern]

oh okay, we're going to be upgrading to 5.1 soon anyway

[chrome bay]

yeah, I think they're too close to release to take it but you never know..

Otherwise though you can just create your own wrapper type. I did the same before this plugin was a thing

[gritty lantern]

lol I found your Twitter by searching FInstancedStruct

[chrome bay]

yee 😄

IDK why nobody sees the POTENTIAL

It's so powerful

being able to pass arbitrary data around, with reflection support, without having to mess around or worry about UObjects and their lifetimes

void subsystems

I'm probably overstating it tbf, but it is super useful

I think it depends, if you're in multiplayer land it's a PITA

but singleplayer it's no problem ofc

[thin stratus]

You know what's also useful and no one talks about and seems to use? Sparse Class Data! flies away

[latent heart]

The bp version of static const?

[thin stratus]

Sort of

[dark edge]

Make a pawn with a static mesh, make it change color with the push of a button, make it work in multiplayer

The best way to learn is by doing.

[timid moat]

Thanks

[vivid seal]

Wait WHAT where do I find out about this?

[twin juniper]

Does anybody know what ServiceResponse and ServiceRequest UFUNCTION specifiers mean and how do can you use them?

[sinful tree]

I think those are UFUNCTION specifiers, not UPROPERTY.
https://docs.unrealengine.com/4.26/en-US/ProgrammingAndScripting/GameplayArchitecture/Functions/

[twin juniper]

corrected but that doesn't solve my problem 🥲

[thorn wraith]

Hello all,

Quick question, for replicating actors, what are my options?

I have this inventory system where at first I was storing pointers to actors. This is fine for single players. But when we get to multiplayer, the pointers become null. My current option is to store the actor (when it is not spawned in game). However, my current huddle is communication. I have the replication setup and working. But I need to know what data I need to communication between the server and the client

[sleek current]

You need to send info to server that you want to do smth with a certain item

So it properly give an update to clients

[thorn wraith]

Yeah, so would that be an FArchive object??

[celest loom]

can you know if a variable float or int has decreased or increased on rep notify?

[sinful tree]

You need to replicate whatever data that the client doesn't know or doesn't have access to know about themselves.
Eg. If you used an "Item ID" as the basis for your inventory, then that can easily be turned into a data table lookup on the client end, negating the need to send all possible data about the item to the client as they can look it up themselves.

Same going from client to server, but with a caveat: You never want to allow the client to just send the server "Put Item ID in Slot 3" as that can lead to players being able to dupe items. To work around this, you have to only allow the client to communicate minimal data about the inventory slots that are being manipulated. Eg. "Move item in slot 3 to slot 1"

[thorn wraith]

Ok I see. You bring up a good point Datura. If I am sending entire actors through the connection, there could be a significant bottleneck on the bandwidth. During my initial design here, it is fine because there is not much going on. But I want to learn best practices here and not have to rework the code later down the road.

Now, from a developers point of view, there are many paths to the solution. Are there any best practices in this situation?

A data table sounds great. Send out a number that corresponds to the class that is supposed to be added. As I make more item classes, I just need to expand the data table. In addition, I would have to send out data specific for the particular class (eg weapon damage or armor rating).

[quasi tide]

In C++ you can get the previous value in the OnRep method.

OnRep_Speed(int OldValue) it'd look somethin' like this

[celest loom]

Hm no way to do it on blueprint? My entire code is currently blueprint

[quasi tide]

🪦

[woven basin]

…I guess on BP you could have a local variable “preRPCstore”, and then during OnRep, you can see the pre store, then update it yourself during the Rep with the new value. Means you have to track the variable twice though. Just a random thought I had to help, defintely not optimal…

[sinful tree]

Double the variables, double the fun!

[celest loom]

Yeah I guess that works! Probably not the best method but works

[quartz iris]

How do I loop through the lobby to see if there are more than 2 players

[kindred widget]

What do you need the player count for?

[quartz iris]

To start the gamemode

So if 2 people are in the lobby load up the map and start the gamemode

[kindred widget]

This lobby is a map that they've already loaded into?

If so I'd probably just use GameState's PlayerArray.

[quartz iris]

Yes

Ok

How do i get the player count

[quartz iris]

Like this?

[kindred widget]

I guess? Though just getting the array length would maybe be better than a loop.

[quartz iris]

I have another question

Im using the default gamestatebase for the gamestate

But I can't edit the gamestatebase

When I try to create a new gamestate the character does not respond to inputs

[kindred widget]

Inheritting GameMode and GameState need to match.
GameMode + GameState = Good
GameModeBase + GameStateBase = Good
GameMode + GameStateBase = Bad
GameModeBase + GameState = Bad

[quartz iris]

oh kk

One last thing aha

If I were replicating to show all players that a character threw a lightsaber

is this correct?

Thrower can be server or client

[twin juniper]

Hey there! Does anybody know what ServiceResponse and ServiceRequest UFUNCTION specifiers mean and how do can you use them?

[grave fog]

Is subsystem online important for multiplayer game ? what happen if I didnt use any?

[sinful tree]

For online multiplayer, yes, but it depends on what you're trying to accomplish. If you don't use an online subsystem, you'll have to make up your own means of connecting players to servers/hosts.
This can be as basic as telling players to set up port forwarding themselves and sharing their IP address with people who want to play, or it can be as complicated as writing your own system that your servers can report to advising their online & looking for players, then on clients you retrieve the list of servers/display them.

[grave fog]

@sinful tree I want to make a game for android Can I use anysubsystem or must be google subsystem?

[sinful tree]

You can use any that are valid for the particular platform. I'm not an android developer so I'm not sure of the exact options.

I'd imagine that Steam wouldn't be able to be used on an Android for example.

[timid moat]

Hi!

I'm working with Unreal 5, and on an ACharacter I have tried this: if (Role == ROLE_Authority) but it seems that Role is private now. I'm new on mutiplayer and I'm following an UE4 tutorial.

How can I do that? Because there is a GetLocalRole and also a GetRemoteRole.

Thanks

[vivid seal]

GetLocalRole is what you're looking for in this case, it tells you what the actor's role is on the current machine. GetRemoteRole tells you what the actor's role would be for a different machine. Check out the networking compendium in the pins, it goes over local and remote role somewhere in there I believe.

[twin juniper]

Hi! I still haven't been able to find a root cause for my micro client corrections which stutter the autonomous proxy in a listen server setup. I tried to cap fps to 30 on both client and server and it didn't help. THis is the debug view (p.shownetcorrections) from both client and server perspective

https://www.youtube.com/watch?v=PM_l2CWIdNg&feature=youtu.be

Any ideas?

[low helm]

I don't think the normal netcode could even make something stutter this bad under default settings

my first guess is that the character is colliding with himself because some of his components or some actor he is dragging around has blocking collision

try turning collision off on everything other than your Character capsule

[twin juniper]

i did try that 😦 but i'll double check

wouldn't server character stutter as well if the collision was the problem?

[low helm]

maybe

[twin juniper]

server is working flawlessly

😦

[low helm]

is the client making adjustments to the speed of the character?

[twin juniper]

hmm, you mean there could be discrepancy between the client /server movement speed?

[low helm]

if you write code anywhere that changes run speed while the game is running, it can cause hitches if the code isn't run on both client and server

[twin juniper]

let me check

i'm setting speed on server when for example speed is changed for gameplay purposes

should i set it on client as well?

[low helm]

yes

[twin juniper]

oh, i tought it would be propagated by the CMC

automatically?

[low helm]

I don't think so

[twin juniper]

i'll try though, thanks

[twin juniper]

@low helm @thin stratus it was the speed dispcrepancy between client and server

[low helm]

https://tenor.com/view/weekend-party-champagne-gif-18280013

[twin juniper]

weeks of troubleshooting

thank you very much!

i'm so happy now

atleast i learned a bit about troubleshooting 🙂

[low helm]

https://tenor.com/view/indeed-tealc-stargate-gif-4496552

[serene furnace]

Hey guys I'm using an Tile View into an inventory system, that is creating tiles when I'm looting items, it creates a class and passes the info, My issue is that only the server can get tiles added into his inventory, even tho I'm using multi cast and "Has authority" node on the multi cast, I tried many things like " has authority" or "is locally controlled" nothing worked so far, any help ? Maybe tile view cant be replicated ?? IDK.

[fathom aspen]

If u use has authority then the multicast only runs on the server. If you use IsLocallyControlled then it runs on the autonomous proxy. If you neither use one, you are still multicasting, and multicasts are bad for state changes (yes inventory is a state).

So all those options are bad.

Instead you want to use replicated properties.

At a very basic level, investory is just a replicated array that you add to/remove from.

[serene furnace]

So what I should just replicate the widget that I use has an inventory ?

[fathom aspen]

Widgets don't replicate

You replicate the inventory

The widget listens for state changes

[serene furnace]

I should make it a component maybe ?

[fathom aspen]

You can make it whatever you want

[serene furnace]

everything is into a widget RN ^^

[fathom aspen]

Well then that means you don't understand the basics of unreal's networking

Find the multiplayer compendium in pinned messages

Read it a few times

[fathom aspen]

So they are as promising as NFTs are?

[serene furnace]

I should probably change the system and make it an array stored into an "inventory actor component" that is properly replicated, and then construct and fill up the widget from the strored item data of the array, to refresh the widget, Right ?

[fathom aspen]

Right, you can.

The inventory actor component would be attached to an actor that is replicable

Usually Character (Can be PlayerState too)

[serene furnace]

I had the same result so far tho... But I think it's because I was not refreshing the Widget properly ^^

[thin tulip]

I'm creating a rollback networking plugin for my own purposes and I'm planning to use a subsystem to manage some aspects of it. I cannot decide if a UWorldSubsystem or a UEngineSubsystem makes more sense. Since it's going to use an Actor as a replication proxy anyway, which needs a UWorld, I'm thinking a world subsystem makes the most sense, but I'm curious if anyone else has a good sense of when to use engine vs. world for a subsystem.

[fathom aspen]

You are not going to be making rollbacks before runtime. UWorldSubsystem ftw.

Why hold a subsystem in memory if I'm not using it

Tho I think Editor has a World, that's why when you PIE for example objects are copied into a new world, so you can get back to where you was when you stop PIE. Meaning you might even have UWorldSbusystem before runtime, but still UWorldSubsystem makes more sense to me.

[serene furnace]

well I'm still stuck and have the same result 🤔

[thin tulip]

Yeah I agree. I can check for PIE in Initialize().

[serene furnace]

So the array Is replicated, The component is aswell and yet still only my server is the only guy able to really loot and display what he looted

[kindred widget]

You kinda told it to do that though. You multicasted to everyone, but only the authority can loot.

[serene furnace]

I removed the has authority now, tho I saw it was still there

[kindred widget]

Probably still shouldn't be being done on a multicast. This is stateful stuff. Client should RPC to server that it wants to loot. Server should do all of the looting, destroying the object, etc. Then replicate new state back to the client. Client's UI can either display from a client RPC with a list of looted things, or the OnRep of their own inventory's items can trigger it.

[serene furnace]

So it should run on server only ? when Client loots ? And since evrything is replicated it shouldnt cause issues, right ?

even my items are replicated so they should destroy normally, but what if there is a late join ? ^^

[kindred widget]

What if there is?

Multicasts are the ones that don't keep state. Using Replicated actors and replicated state means late joiners have no problems being updated. If you multicast an item's destruction, new joiner has no way to know that

[serene furnace]

so replicated items act like Rep notifys I assume

[kindred widget]

I can't remember if the server will tell the client to automatically destroy an object preplaced on map.

[serene furnace]

well I will see on my next test I guess ^^

Well I called it on server only, items destroy but still same result, should I put the "Has authority " back ? 🤔

[kindred widget]

Not fully sure. Chain of logic should just be... ClientInput->ServerLootItem->InterfaceToLootItem for starts. That'll be your gameplay logic, it should pick up the items to the inventory, which should be replicating them back to clients. Then destroy the pickup, which should automatically destroy on clients as well.

[serene furnace]

currently what I'm doing is

Client input -> call server event "loot" -> Send message to Item Interface -> Item transmit his Struct to the player inventory component ( not replicated struct /Instance edit Expose on spawn but replicated item) -> Struct creates an Item object and add it to the tile view of the widget that is holded into the inventory component (Component replicated Array of Item object replicated).

I'm thinking that this struct I'm passing should be replicated ??

well replicated or not the item struct is not showing into clients inventory, still 😦

How do you see the logs on clients into a standalone test version ?
My message log shows nothing in editor and output log either ^^

[quartz iris]

Should I be using a gamemode or gamemodebase for my mode? it needs to contain the round number and wins etc

[prisma snow]

gamemodebase is lighter and has less stuff

gamemode is more suitable for fps-like games

look into the gamemode class and see if you need the functionality it provides, or if you don't

[quartz iris]

got it!

[quartz iris]

I could use gamemodebase to change the map after 2 players are in the lobby right?

[prisma snow]

Idk, it's been long since I used it. Read the class to see what functionality it provides

[regal geyser]

On Listen Server, low FPS clients' animations are pretty laggy/jittery. How can I solve this issue?
I see it's quite a common problem, but so far I was unsuccessful in finding a solution for it.

[elder sable]

Where do you put game logic, in gamestate or gamemode ? Gamestate should be easier for client/server common code ?

[fathom aspen]

That's not enough to tell where "game logic" should reside

[fathom aspen]

Yes, example you can ServerTravel

[quartz iris]

Servertravel is a node or just open level?

[fathom aspen]

Are you BP only?

ServerTravel isn't a node but it can become one if you use ExecuteConsoleCommand

See what options are in BP: https://wizardcell.com/unreal/persistent-data/#travel-drivers

[peak sentinel]

Can data assets be replicated? I use TSubclassOf<> to replicate data objects currently and I'm not happy with it currently

[elder sable]

So that mean's it's ok to use the gamestate for actions ? (not just states)

[fathom aspen]

https://forums.unrealengine.com/t/data-asset-problem-fnetguidcache-supportsobject/476946/8?u=wizardcell

[fathom aspen]

It means you didn't give me enough info on what logic you're referring to so I could answer your question

[elder sable]

Mhh was a general question, i don't really know what should be in the gamemode, i'm just initializing and spawning the game here, dunno if it should be use for something else

I use the game state for the rest

[fathom aspen]

Look at the two class headers and you will understand on your own what should reside in each

GameMode being rules of the game, while

GameState is just game state

[elder sable]

Mhh ok

[fathom aspen]

Wondering what you mean by TSubClassOf to replicate objects?

If you are replicating runtime objects then you are going to replicate them thorugh some actor channel

[peak sentinel]

i formalized incorrectly, i was meaning replicating the pointer to object. I replicate the TSubclassOf property in actor and get CDO when I need to access its default values

[peak sentinel]

nice. so data assets allow us to reference them over the network

[candid mortar]

do any of you have a recommended sample project or marketplace pack for a barebones multiplayer FPS game? i'm a web dev/noob to UE5, looking to tinker around with a basic client/server setup

i'm sure this gets asked a lot, so I'll search around too

[chrome bay]

ShooterGame / Lyra for Epic Samples

[candid mortar]

thanks, Lyra looks like a great way to start out

[pallid mesa]

Lyra is the most up to date example

but also more complicated

[quartz iris]

Hey guys

Why do I get this error on the client after this code is ran?

The one who hosts the server has no error and loads the level fine

[sinful tree]

Few things I can see as problems.

1. You don't want to have the client sending an RPC to the server to tell the server to change the level as malicious clients can then exploit that RPC to force the server to perform the action when it wasn't intended. The server itself also knows whether or not there are 2 players, so it doesn't need a client (actually all clients) telling the server to do the level change. Instead, gate your Tick using a Has Authority > Authority node - this will ensure that only the server/host will be executing the code as the game state is an actor the server has authority over.

2. If you have a server already running with clients connected and you use Open Level to move the server's level, you're going to be booting all other players from the game as only the server will open to that map and ignore all connected clients. You'll need to look up server travel - there's a means of having the server transition to a new level and keep existing clients connected. This could also be why you're receiving the message you are as the clients are being booted and trying to load the main menu map which perhaps doesn't exist? Keep in mind that Server Travel is also not the same thing as Seamless Travel, and I don't think you can test it working without running as "Play Standalone".

3. If you are opening a new level, setting the value and playing a sound immediately after is somewhat pointless. As soon as that open level command is executed, everything else after it won't happen and in the case of the variable, it's not going to save.

4. And finally, a small optimization - you shouldn't need to be checking how many players are present on tick. Game mode gives you an event when a new client has joined the server (OnPostLogin is the event I believe). That event could then be used to call that particular check in your game state so it's only checking how many players when a player joins.

[twin juniper]

Hi! I have a steam listen server and i would like to display server ping via umg

BP only project

Any way to do this?

(while the client is connected to the server to be more precise)

[pallid mesa]

you can find ping in the playerstate

@twin juniper

[twin juniper]

thanks

[timid moat]

Thanks. That's what I'm doing, but without some guidance it's quite difficult: https://forums.unrealengine.com/t/change-on-one-playerstate-playername-updates-all-players-with-the-same-name/689398

[dark edge]

the server is the server.

[latent heart]

That message made entirely zero sense.

[prisma snow]

Is it common to use a dedicated server ALSO as a central server to help players connect with each other? I always thought that the usual approach would be to make an independent backend for user/room management, and let dedicated servers just run games

[latent heart]

A lobby server?

You could use a ue dedi server for that. Like the warhammer game that betad the other week, where they have 100 people running around a ship while waiting for a game.

But you'd only use it if you actually want people to interact that way.

As you said, it's a lot easier to host a map locally and just query a dedicated backend service if you don't wnat people to see each other in that kind of animated context.

[serene furnace]

Hey, I'm still stuck with my stuff, So my clients cant display what they looted, but the item they looted is destroyed for everyone, only the server can see what he looted into the inventory, anyone could help with that ? I'm still pretty new to all the replicated stuff ^^ thats the code in the right order.

Items are replicated, Inventory component is replicated to a player class that is replicated aswel

[timid moat]

If I have two players, why do I have only one PlayerController?

[fathom aspen]

Because you are looking at the client world

On client only exists the owning PlayerController

[timid moat]

I'm having a lot of problems with this. Because I want to change the name for the client player and it changes the name in the server and in the client. I have a widget above the character's head and it changes there in both players.

[worn wagon]

I'm struggling to find the best way to do something. I have a replicated ActiveWeapon variable, there's an OnRep callback that updates relevant HUD & Meshes. I am trying to implement clientside prediction for weapon switching, where ActiveWeapon is set instantly on the client to avoid input delay. The issue is when swapping weapons quickly, as the ActiveWeapon variable is set serverside and replicated back, meaning it will repeat the sequence with a delay depending on ping. It still ends up in the same place, but it obviously looks very bad.

This variable is also used by other players to show a third person weapon, which complicates it further

Ideally I could only replicate the variables to certain players at certain times, but from what i've read you can't have this much control with replicated properties

The closest thing I found was DOREPLIFETIME_ACTIVE_OVERRIDE, but this only works on a per actor basis not a per connection basis

I could achieve what I want with RPCs but it would be hacky and lose the stateful replication, which is not what I want to do

[quartz iris]

Hey I followed what you said, how do I target all the players in the lobby though so they travel?

[timid moat]

How can I get the player controller for the current player in a Multiplayer game? I don't think it is always at index 0, or am I wrong?

[worn wagon]

The player controller only exists for the client and the server, meaning other clients don't have access to other clients playercontrollers. So besides splitscreen local multiplayer it will always be at 0

There will always only be 1 player controller in an online multiplayer game for clients

[quartz iris]

Like this?

[timid moat]

Thanks!

[serene furnace]

Well, I've change my system again, using the exact same code with a Scroll box and adding childs to it, and this solution is working with the exact same code,
Anyone has any itel about tile views being impossible to replicate or work with in multiplayers projects ?

[serene furnace]

my issue was there BTW

[short arrow]

So I'm reading force net update and flush net dormancy in c++

what the heck is the difference?

It looks like in essence force net update just checks if it's the server, and if it is then it calls flush net dormancy... while flush net dormancy will only run if it's the server...

{
    if (GetLocalRole() == ROLE_Authority)
    {
        // ForceNetUpdate on the game net driver only if we are the authority...
        UNetDriver* NetDriver = GetNetDriver();
        if (NetDriver && NetDriver->GetNetMode() < ENetMode::NM_Client) // ... and not a client
        {
            NetDriver->ForceNetUpdate(this);
            if (NetDormancy > DORM_Awake)
            {
                FlushNetDormancy(); 
            }
        }
    }```

Why wouldn't I just call flushnetdormancy directly?

[quartz iris]

Man

I really cant get this to work lol

[static flare]

My replicated actor holds a UPROPERTY(Replicated) UMyObject* MyObject (just a subclass of UObject). It's instantiated during the actor's constructor, using MyObject = CreateDefaultSubobject<UMyObject>("name");
That UObjects holds a UPROPERTY(ReplicatedUsing=OnRep_MyArray) TArray<int> MyArray. I'm having a hard time replicating everything properly.

At first, the MyObject-instance wasn't replicated at all. It was NULL for clients. Props were set up correctly, but apparently I had to implement and return true in IsSupportedForNetworking(). Using this, the UObject suddenly existed for every client. However, server-changes to MyArray doesn't seem to replicate at all.

[short arrow]

what are you trying to do? get all clients to move to a different map?

[quartz iris]

Yeah server and 1 other client

To a different map

[short arrow]

there should be a node "ChangeMap (Server)" in game instance

which automatically travels the server and clients to the specified map

[quartz iris]

I'm trying to do it in the gamestatebase though

[quartz iris]

Do you mean this i couldnt find that in the gameinstance

[short arrow]

maybe just remove specific player? pretty sure you don't need it

https://gyazo.com/b7f0cf6287b9fcdd4b0a9dcd68d4aac9

[quartz iris]

Yeah that server travel node does nothing at all

[quartz iris]

Howd you get this node? lol

[short arrow]

is it not in your game instance?

[quartz iris]

No?!

Or in my gamestatebase either

are you on ue5?

[short arrow]

hmm actually I think it's a plugin nevermind. It does exactly what you're trying to do though, I genuinely think you should remove the specific player

[short arrow]

TargetPC->ConsoleCommand(TEXT("servertravel ") + Map + Args, true);

yup

it's the same thing

I don't use any specified player

I just call it on the server

and all players travel as well

[quartz iris]

Whys the server not changing the map then?

wtf

[worn wagon]

@quartz iris If you use ServerTravel all clients should follow

[short arrow]

maybe the name is incorrect?

[worn wagon]

GetWorld()->ServerTravel

[short arrow]

no not that one

execute console command is fine

[quartz iris]

i dont understand why it doesnt work

it has aspace

[short arrow]

try using a different map, or the current map you're in with what Ghetto suggested

GetWorld()->ServerTravel

see if that works

[quartz iris]

like this

[short arrow]

not quite

[quartz iris]

UWorld::ServerTravel

[worn wagon]

GetWorld()->ServerTravel()

[quartz iris]

Can i use it with append?

[worn wagon]

You supply a URL to the function

So yes, just append what you want to an FString and pass it in

[quartz iris]

with a space?

[worn wagon]

No

[quartz iris]

GetWorld()->ServerTravel()

append

[worn wagon]

For example

The url is a path to your map uasset

You can add parameters to the url as well, for example adding ?listen to the end of the url will host it as a listen server

[quartz iris]

Game/Maps/Valley_Of_The_Dead.umap

Append

[worn wagon]

without the umap

[quartz iris]

ok

[worn wagon]

just the name

[quartz iris]

Game/Maps/Valley_Of_The_Dead

append

[worn wagon]

yeah i mean if the map name doesn't change you can just pass in the fstring, the append is for if you want to change the map based on some variables or whatever

[worn wagon]

no no no

one sec

Go back to what Neon said. it's done slightly differently in blueprints

It seems like you do have to execute a console command

Just make sure you are running the command on the server

[quartz iris]

i did it through a custom event on the gamestatebase

[worn wagon]

Try capitalising too, ServerTravel

I'm not sure if it matters

[quartz iris]

but this is a advanced sessions node

its made for it surely

[worn wagon]

oh okay if you're doing it that way instead of console commands sure

[quartz iris]

it would be the url which is what u said

In URL

[worn wagon]

What you have looks fine, you might need an extra / at the start before Game

[quartz iris]

oh ye

[worn wagon]

I know how it works in c++ not blueprints

I think advanced sessions is just calling the ServerTravel function but I'm not sure

Give it a try anyway

[quartz iris]

it still does nothing

lol

[worn wagon]

How is the travel to server event called

[worn wagon]

I mean for one, if this is in gamestate it's running on client and server but your authority check isn't wired up, so it's gonna try and call it on client and server. But it still should be doing something which is weird

Try adding a log before the ServerTravel to make sure it's actually being called

[quartz iris]

its being ran for sure

it printed text

[sinful tree]

This goes back to what I said earlier:
Keep in mind that Server Travel is also not the same thing as Seamless Travel, and I don't think you can test it working without running as "Play Standalone".

[quartz iris]

Its running as standalone

[sinful tree]

Oh single process!

There's a setting for that in the editor settings.

[quartz iris]

2 standalone one joins the server the other created

[worn wagon]

Ah yes I remember having to do that now

[twin juniper]

Please repeate, how to make couple room on server and somehow name them?

[quartz iris]

its..

not ticked

[sinful tree]

🤔

[worn wagon]

@sinful tree Any chance I can get your thoughts on this?

[worn wagon]

Yeah tick it 😄

[quartz iris]

oh kk

WAIT so

If this works after doing that

does that mean it will work when i package the game and players play the game?

[worn wagon]

yeah should do

[quartz iris]

i dont fully understand

ok