multiplayer

[thin stratus]

Everyone will use their own

Changing them is like changing a TextureAsset (the actual asset itself)

It doesn't magically replicate

[lament flax]

yes, no worries i didnt plan to do this

its just intersting that you can

[thin stratus]

They are Objects, so you can alter them, but you are still altering them as an asset

And this doesn't replicate

[hardy turtle]

oh yeah, indeed! you can change it at runtime, i wasn't talking about the multiplayer

[thin stratus]

Yeah but you are using it in a Multiplayer set up

The change your client does to that file won't replicate

Not even if you RPC them to the Server etc

[lament flax]

there is probably useful cases where you want that behaviour

[thin stratus]

Rarely

We only ever had one case where we modified it runtime, in C++

[hardy turtle]

hmmm yeah that's true, so i guess i should pull it from everyone's GI and then notify it to the others, but the replicated pawns should not pull from the GI right?

[thin stratus]

And that was to ensure that all Chests were using the same chance calculation and that getting an item from it changes the chance for the others

And even that should potentially not be done via the DataAsset

DataAsset is supposed to be ReadOnly

[thin stratus]

You need to have some sort of Structure that holds all changes in a format that can replicate

And then in e.g. OnControlledChangedEvent -> IsLocallyControlled in your Character, you get the GI, RPC the Struct to the Server and the Server sets it on a RepNotify variable

And then you apply the changes in the OnRep

[lament flax]

in what cases DTs are good ?
because for me its just a more anoying version of DAs

specially because it goes through all rows to get the one you want

[hardy turtle]

dude thank you really much! ❤️

[thin stratus]

DataTables are more like a Spreadsheet

[lament flax]

yeah

thats why i am wondering some good usecases

[thin stratus]

Eh, there are some, but I can't name any atm

Some stuff in the Engine needs them

I often use DataAssets, or with the power of C++, turn my normal BPs into "DataAssets" and similar

[hardy turtle]

I used one for the character selection and another one for some options such as force feedback and gore, it can be quicker for some stuff to access them and the cool thing is that changing them at run time you don't need to update anything else

the only downside is that you have to save their state once you close the game and set it back when you start it again otherwise they get reset to their initial state

[thin stratus]

It's mostly if you really want Spreadsheet like Data for something

Aka mostly 1 depth deep stuff like some meta data about an item or so

But in almost all cases you could also use DataAssets fwiw

[hardy turtle]

🤔 are we talking about the primdata right?

i'm sorry if i get messy, i have no background in programming 😅

[thin stratus]

DataTable - Asset you create from a Struct where you add Rows to
DataAsset - Asset you create from, e.g., a PrimaryDataAsset Class

One DataAsset Asset is usually the same as one Row of a DataTable

While the Struct defines what data is in each Row for the DataTable, the selected DataAssetClass defines what the DataAsset has in terms of properties.

They are pretty similar, and again I would say that one can do most of the DataTable stuff with DataAssets.

But there are still use-cases for DataTables fwiw

I think there are also things where you can combine multiple Tables into one or so

I'm more a friend of DataAssets and the AssetManager, but iirc that needs a bit of C++

I like to just ask the AssetManager for all DataAssets of Type XYZ.

Also allows for SoftReferences and what not.

[dark edge]

whos gameinstance? The server or clients?

[hardy turtle]

thanks for the explaination dude!

[hardy turtle]

i should pull it from clients gameinstance

[dark edge]

Then it needs to be sent over through a run on server event

[thin stratus]

I already wrote that

[hardy turtle]

yeah @thin stratus gave me some insights 🙂 thank you dude!

[hoary spear]

DataTables are cool, but their editor is subliminal

Not being able to edit multiple column/rows at the same time, in any way is horrible

not being able to just edit a single cell without opening the row,

is terrible

[lament flax]

yes

[maiden flame]

@twin juniper Maybe I misunderstood, but why not use an AnimNotify/AnimNotifyState to sync your hitbox timing with the montage?

[lost inlet]

Do you have that message bound to a hotkey or something

The one you just posted because you posted something incredibly similar last night

[maiden flame]

@lost inlet Why is it bad to use AnimNotifies for gameplay in multiplayer? I would like to know as I rely on them quite a bit.

[lost inlet]

I worked on an FPS. We saved the animation timings offline so we didn't have to run the animation blueprint on the server

But there can be timing differences, especially if you run animations at a reduced rate on the server

Because you probably don't need high fidelity animation on the server

[maiden flame]

Just to clarify, are you referring to latency or skipping notify ticks due to server tickrate?

[lost inlet]

On the dedicated server the character animation update rate was about 5Hz, and the first person animations didn't run at all

[maiden flame]

Hm, I see. Thanks.

[lost inlet]

And reload timings were based on first person animations

So since they didn't run, they just used presaved timings. The animation sequences didn't even need to be loaded

[maiden flame]

I'm using AnimNotifies for a continuous hitbox (swords basically), but the server only really needs to know a socket location from the skeletal mesh during montages. Haven't had any issues yet.

The timing is consistent, but of course latency will have it's own effect on top.

@twin juniper What server model are you using? Not sure why pausing would be an issue for an online game, unless it's a listen server and window focus somehow affects the timers/animations.

I don't really know though, just asking. Feel free to ignore 😛

[hollow eagle]

Unreal has a way to "run" montages as pure notify data - no animation calculations. If you don't need any animation calculations on the server whatsoever you can just use that.

EVisibilityBasedAnimTickOption::OnlyTickMontagesWhenNotRendered will fire off notifies as normal but not tick animation otherwise on the server (since the server never renders).

It can still be a bit more expensive than caching notify timings outside a montage (just because you have a bit more overhead for using the animation system at all, and it still ticks rather than doing something like scheduling with a timer), but it shouldn't be much.

though I forget if that's the only thing you have to do. There may be some other options necessary to prevent any other calculation of animation data.

[lost inlet]

Looks like for a melee system you'd need the transform data of whatever point you're reading at the notify in the animation

[dark edge]

I mean if you need it you need it

[lost inlet]

Well the melee system that was described

[dark edge]

if you need accurate hit detection and are blending anims all over the place then there's no way around it really

[lost inlet]

Yeah but having it super accurate seems like a whole can of worms in a multiplayer context

[dark edge]

ya it depends

WoW works
Elden Ring works

[lost inlet]

I would expect something that is doing super accurate stuff to be somewhat using CSHD

[dark edge]

What's that?

ah clientside hit detection

yeah that'd probably be the source of the hit, but you still want consistency and to be able to sanity check things

[chilly haven]

Hi,
If a game team is shipping multiplayer-only, dedicated-server-only, then they have the opportunity to keep the server code completely out of the hands of the players, by making separate builds for dedi and client, and by using preprocessor directives.
I.e. do not support listen server at all, not even for dev.
Is this common? Your dev team would need to use dedicated servers for all testing, rather than listen servers.

But it the most secure approach.

[fossil spoke]

If you are building a dedicated server game, why would you test it with listen servers???

That just makes no sense

So of course you would need to test with dedicated servers...

[fossil spoke]

Yes

[chilly haven]

Know of any teams who have done this?

[fossil spoke]

Yes

[chilly haven]

Most AAA teams I know support a listen server for dev. But that may not be the best choice in these circumstances.

You can even bundle dedi+client somehow to make it easy for team to use

Basically if you are not supporting single-player, nor player-hosting, you should consider this option.

[floral fox]

if i wanted to send location under cursor do i do that on client and send vector as rpc to server?

[sinful tree]

Yes. The cursor is something that only exists locally so it would be required for a client to get its cursor position and send it through an RPC to the server if you want the server to know about it.

[floral fox]

and is that normally done? i keep reading tick is bad for rpc

[torpid lantern]

How computationally heavy is "get all actors of class"?

I'm trying to build a "line of sight" check, using a line trace for object. I need an array of actors to ignore; otherwise my sight check will fail if another pawn steps in front of the trace line.

For my use case, I want the trace to only be blocked by a specific object type.

Question: Is there another method of trace that I can use, otherwise is it okay to use get all actors of class every time a player attacks on the server; say 30-40 players @ 30 attacks per min?

[sinful tree]

Sure it is. Is it necessary to send the RPC continually on tick? Can you maybe get away with a lower rate?

[floral fox]

the mouse controls a paddle (ping pong), so i think continiously is best, i optimised it where it doesn't do rpc when mouse and actor loc is same

[sinful tree]

So that would be a good use case for using full-on tick considering it would be a player input which is usually something you would send on tick - even the character movement component does this.

Perhaps you could save some network bandwidth by checking if they actually moved it (position is same as last sent position) and not send the RPC if they didn't move it.

[floral fox]

thanks, didn't think about storing and comparing previous

[toxic goblet]

Hi guys, do some one know how to simulate different weak net envir in editor on two clients? Unreal seems only can simulate same weak envir on all clients. 😦 I want to apply different net settings per client in editor.

[chilly haven]

Question. For developers creating only dedicated servers and clients (i.e. no listen server, no single player), how do you separate your client and server code?
Do you just litter each module with the appropriate preprocessor defines?
Or do you create separate class instances for server and client (and conditionally compile)?

[pallid mesa]

former

[chilly haven]

was it a conscious choice?

[pallid mesa]

yes, it is the "unreal way"

[potent coral]

you should specify that you want different net settings per client

[chilly haven]

Guess I can try both ways and see which is less painful

[toxic goblet]

Yes thank you.

[chilly haven]

Actually I guess there are 3 cases: server only, client only, shared.

[toxic goblet]

Ok it seems the console command has support that. 🙂

[urban moth]

what is an equivalent for GetFirstLocalPlayerController in BP?

[sinful tree]

Don't think there is one exposed. "Get Player Controller" with index 0 is closest, but that doesn't really take local into account when dealing with the server/host.

[urban moth]

I will expose it then.. thanks

[warm willow]

When dealing with UMG or input, is it /in certain cases/ safe to use on client getplayercontroller(0)? I had to use it few times, everything seems to be working okay, but...

[chrome bay]

Not really, the only exception would be if you are working exclusively with dedicated servers

UMG Widgets have an owning player so it should be easy to access through that.

[lament flax]

for inputs where i want some hold before doing X

should i calculate the cooldown in client, and only call the final result event on server ?

since calling on server each tick might be to much for nothing

[chrome bay]

If it's just about a different input method and doesn't matter for gameplay, just do it client side

[lament flax]

well it will matter in gameplay

for example

user has to hold a key for 2 seconds then I call "Use item" on server

i dont see an issue if i run the check and add "elapsed time" on server side

[chrome bay]

Timers over network are not pinpoint accurate so you might occasionally fail in the "real" world.

[lament flax]

thats the thing, if user has a bit of ping, 2 seconds might become 4s

for the client

[chrome bay]

If it's just for input, it doesn't really matter. If there are gameplay reasons (i.e. it's a firing delay or something), then really it doesn't belong in the input domain

[lament flax]

okay

i'll stay with server then

i'll maybe to a timer by event instead of adding delta seconds each frame

[chrome bay]

Well you certaintly don't want to be sending an RPC with elapsed time every frame

If you must do timing on server, send a "start" and "end" RPC and allow some tolerance to account for network error

You can just use timestamps

[lament flax]

how would i add some "tolerance" ?

[chrome bay]

You check the length of time on when the client "End"s pressing, and checks it's near to the time you expect them to hold the button for plus some small tolerance for error

The point is that in the real world, those RPC's will not arrive with a perfect 2 second delay

[lament flax]

i see, ty

[chrome bay]

psuedo-code

void Started()
{
    LastStartTime = GetWorld()->TimeSeconds();
}

void Stopped()
{
    float TimePressed = GetWorld->TimeSeconds() - LastStartTime;
    if (TimePressed.IsNearlyEqual(2.f, 0.5f)
    {
        DoThing();
    }
}```

[lament flax]

also, i found that that you can use replication conditions
for the elapsed time float var, i should do this in owner only right ?
because other clients doesnt care about "how far he his"

[chrome bay]

Client should just track it locally

Replication will be way too latent to be of any use

Plus it's wasteful

You should test this with packet emulation to see how quickly it falls apart under real world conditions.

[lament flax]

the server is running the timer

[chrome bay]

Just run one client side too

Doesn't have to do anything

Your 'ElapsedTime' property will not update regularly enough to be of any use

[heady copper]

hello goodmorning guys ..please i am trying to make a static mesh movement replicate form client to server

[chrome bay]

It will in editor, but not IRL

[heady copper]

it works from server to client

but not the othe way round

[chrome bay]

Replication is always Server->Client

If you want the client to move it, you have to tell the server to move it via RPC

[heady copper]

i wonder why...i have implemented rpc

for client to server but doesnt work

[chrome bay]

What does the log say. You need to be the Network Owner of the actor to call a Server RPC

Clients are not allowed (for obvious reasons) to just move any actor they please

[lament flax]

earlier you said that if its gameplay-related it should be on server

[chrome bay]

The Server should just validate things for gameplay, that doesn't mean for UI for instance you need to replicate that back to the client

[heady copper]

yes but the rpc is set to run on server so the client sends it

[chrome bay]

Who owns the actor you want to move? If it's just placed in the level, they won't be able to call the RPC and the log will tell you that

[heady copper]

this the code

[lament flax]

to small

to read

[heady copper]

ahh

let me make it better sorry

[chrome bay]

Well that's definitely not going to work

You're getting the Mouse Location from a Multicast, that's going to give you the mouse location on the local machine

[lament flax]

so

• (client) runs the timer
• (client) if the elapsed time meets the conditions call event on server
• (server) gameplay stuff

?

[chrome bay]

The Client calling the RPC needs to send the location to the Server with the RPC. The Server should then set the ball to that location, and the ball should have "Replicated Movement" enabled so that other client see it. You don't need or want a multicast here

[chrome bay]

IMO yes. Server simply validates the client calls to start and end the timer are within a tolerance, but only IF the timer is critical to gameplay functioning properly

[lament flax]

ill do that, thanks for discussing this with me

[heady copper]

rightttt

sorry not rili used to bp thanks for the clarity...

[torpid storm]

I have a question for anyone familiar with the C++ side of UE multiplayer.
Here's my timeline:

1. Start a game in PiE, 1 client
2. Map includes one 'NetStartup' actor with a replicated property (in this case a material color)
3. I change that color during play, see it change onscreen
4. I connect a second client (via the experimental 'Allow Late Joining' option)
5. Second client gets the RepNotify for the NetStartup actor's changed material
6. Second client gets BeginPlay called on the NetStartup actor, as a side-effect of the GameState RepNotify
7. Play starts on second client with all actors in correct states

This is all good, but here's my question - where in the code does it guarantee - if it guarantees it at all - that the net startup actor will get fully replicated to a joining client before the game state? Is there any guarantee that the in-world actor states are all replicated to a new client before they get BeginGame called on them?

[lament flax]

well, since the actor is not owned by the client i cant really call the validation on server

[torpid storm]

If you're asking about "for inputs where i want some hold before doing X", just count it on the client then send the RPC. On the server, do extra validation

[lament flax]

thats what i am trying to do

the thing is that the client cant call the event on server because he is not the owned actor

[torpid storm]

You can always do validation on the server. You can use a different actor if you need

[obsidian halo]

Does destroy session only works for host(listen server)? and if i wanna leave a session as a client i should just open a new map?? instead of using destroy session??

[lament flax]

this will be dropped

[hoary spear]

You need to route it

[torpid storm]

Well, I don't know anything about what that is, what it's called on, or why you rely on it.

[lament flax]

wdym

[hoary spear]

Through a client owned actor

[hoary spear]

Isnt there a leave option?

[lusty sky]

basically have the rpc on a player owned actor like a player controller or character and call it there

[hoary spear]

But yeah clients cant destroy sessions

[obsidian halo]

leave option???

[lament flax]

let me give some context

• (player character, client) input event
• (acbp on player, client) call interface on item (actor)
• (item actor, client) call event on acbp
• (acbp on item, client) run timer
• (acbp on item, client) when conditions meet callback to server <- where i am stuck

[lusty sky]

who owns the item is it the player who pressed input?

or no one?

[lament flax]

the item is spawned by client, and is replicated
so the client is the owner

[torpid storm]

It still exists on the server. You can still call RPCs on it

[lusty sky]

so the rpc should work if the client is the owner right?

[lament flax]

only thing that isnt owned by client is the actor component attached to the item actor
but its weird since the owner of the item actor is the client

[torpid storm]

Just sounds like you need a [Server] RPC

[obsidian halo]

so how to make a client leave?? i saw few forums and videos they all said destroy sessions

[hoary spear]

apparently you should call destory on clients aswell, according to forum post from 2016

[obsidian halo]

im calling but its not working

[hoary spear]

do you have a valid session?

[obsidian halo]

yes

[obsidian halo]

its working when i call it from host

[lament flax]

1- (item actor) on client
2- (item acbp) on client
3- (item acbp) on client, not calling on server

[hoary spear]

are you testing this in-editor ?

[hoary spear]

wouldnt you do local prediction, and only replicate a bool from the server for when its avaliable again ?

[lament flax]

that what i am doing

[hoary spear]

this doesnt look like that

[lament flax]

doing the cooldown on client, and call the result on server

his is client side

[obsidian halo]

yes

[lusty sky]

do you get any warnings when the rpc is called?

[obsidian halo]

and with play as standalone checked

[hoary spear]

I wouldnt trust the result in-editor , as they can differ from actual clients by a fair amount

[lusty sky]

that means the item is not owned by the client who called the rpc

[lament flax]

so the tiem actor isnt owned by client

[hoary spear]

are you using a session plugin?

[lament flax]

weird that on breakpoint it shows "client"

[obsidian halo]

i saw a video, it says to open a level, but i read in the docs u cant join a session unless u destroy the preivous one so if i open a level will it destroy the session??

[obsidian halo]

advanced sessions plugin yes

[hoary spear]

well are you blocking client logic from executing ?

[lament flax]

wdym

[hoary spear]

the start use

is it explicitly called on server, or on client aswell?

i suspsect client calls it

[lament flax]

i just resume to breakpoint to breakpoint

[hoary spear]

so, it runs oin clinet

[lament flax]

the IBP event ?

[hoary spear]

the interface event yes

[torpid storm]

The "no owning connection" thing looks like a massive red flag to me. That implies something is wrong with how that object is being created, or that it's not designed to be replicated at all

[lament flax]

full call stack

from player character to item

[hoary spear]

yeah seems like the server spawns a usable item for a client, who has no ownership iover the item

which would be strange, imo

[lament flax]

the actor is spawned from server

[hoary spear]

and you forgot to set owner

so client cant rpc server

[lament flax]

it isnt automatic ?

[hoary spear]

and server dont know which client to rpc to (as it has no client owner)

ownership is explicit, always

[lament flax]

im to used for solo games

works now

ty guys

[lusty sky]

Now you have to change the owner eveytime a different player tries to do that xD

[lament flax]

wdym

item is spawned each time the selected slot in hotbar is changed

[hoary spear]

We dont really know if this is an item spawned from an inventory, ment to only be used by a single player

right

[lament flax]

it will always be the correct client owner

[hoary spear]

so single owner is fine

[lusty sky]

if the item is going to be used by different players

[lament flax]

.

[lusty sky]

oh all good then

[lament flax]

and so destroeyd when unselected

[hoary spear]

Its only used by one player, as it is their hotbar item ^^

[lament flax]

ty for wondering

[hoary spear]

verified that the node is excecuted on the client ?

[obsidian halo]

i found a node called end session in advanced sessions plugin

its working

[hoary spear]

There's also a function in GI (not BP exposed) that safely returns you to main menu

Ah cool ,alright

[obsidian halo]

thanks

[ember jasper]

@thin stratus
Hi ! 🙂
Found that old post and was wondering if - with all the experience you gathered - you would come up with a cleaner solution ^^
https://forums.unrealengine.com/t/rpc-client-server-not-working-owner-problem/32590/12

[hoary spear]

There's not much choise beyond routing it through a client owned actor

[hoary spear]

That or edit the engine

[warm willow]

"If your team consistently implements the extra steps for creating multiplayer, the process of building gameplay will not consume much more time compared to a single-player game". Ive recently finished my first (multi) unreal game. And this line from unreal manual makes me feel like an idiot. Because ive struggled hard to get things working compared to single player. Do you with year(s) of exp agree with unreal devs?

[hoary spear]

If you at both starting points would have the knowledge to use the framework as intended, i would kinda agree (altho I dont have years of MP experience myself)

I feel like MP forces you to work with the framework, while singleplayer gives you tons of leeway to almost do as you like

(Which doesnt speak to the quality or 'correctness' of the code, but if it works per your frame budgets and target performance, it can be considered acceptable)

[warm lintel]

If your game fits entirely within the framework that exists out of the box and doesn't require any extra logic than marking things "Replicated" and maybe occasionally checking for authority then sure, but objectively speaking no it's not true

[hoary spear]

Biggest caveat being related to prediction / lag and compensation of it

[warm willow]

i've added multi when game was like 50% finished, thinking that checking 'replicate' will make multiplayer. And result was like someone hit my face with a brick

[warm lintel]

Brick hitting your face is indeed the intended behavior 😛

[hoary spear]

Yeah, its not just flipping a switch, thats for sure

Its often rewriting tons of code to even get the events in the correct sequence etc

[warm willow]

Yes thats what I did... Can you recommend any unreal sample to learn multi? Although Ive finished the game I feel 50% of stuff I coded badly. I did everhing in blueprints, is it big no-no when doing multi?

[hoary spear]

It certainly constrain you heavily compared to the fine-grained control you get in c++ when it comes to replicating properties and whatnot

Dont really have much learning material beyond stuff pinned in this channel already

[warm willow]

thanks

heres screenshot to make your day better

love pasta

[hoary spear]

Ugh

Yours?

Functions functions functions

[warm willow]

yeah

oh this particular graph have 60 functions hehe

[hoary spear]

Not enough apparently 😅

[warm willow]

fix on fix on fix on fix

[hoary spear]

AI?

[warm willow]

pseudo AI

with mimicking user clicking on ui

[hoary spear]

Damn

This reminds me of an old game i used to play

[warm willow]

jones in the fast lane

[hoary spear]

Yepp!

Damn, 25 years ago or smth 🤣

[warm willow]

good times playing on single pc with friends

[tardy fossil]

can GetActorEyesViewPoint be used on a client?

[torpid storm]

Of course

[indigo brook]

I need private multiplayer tutoring. I'm not fully grasping things and I need just one hour of someone's time to help answer any questions I have. Any takers?

[dark parcel]

paid?

[indigo brook]

I mean, do you know your stuff? @dark parcel

If it's paid, I expect you to have some proof you know your stuff haha

[dark parcel]

@indigo brook not much but I can route you to #freelance-jobs

[hoary spear]

I know my stuff, but yours is unknown

[indigo brook]

That's good man, I'm making single player games right now, I want to transition to multiplayer, you can check my profile

[modest crater]

I know you cant replicate a tmap in a traditional sense but is it fine to serialize and send a version of a map over rpc inside of a struct payload

[chrome bay]

you can do it yeah

[storm wind]

I'm having an issue, when 2 player connecting to the same dedicated server using open level + ipAddress of AWS ec2 instance, the one of the player controller sometimes stucked

The issue is when 2 player connect in the same moment

It happens in aws, also happen in my dedicatec server in my local laptop using PIE 2 player

[deft plinth]

Check out your Game mode. PostLogin is called after a player joins. Maybe you overriden something there already and broke it for anyone other than the first player
If you can't figure it out, try it out with an empty level or different game mode.

Game Mode is responsible for handling the player connecting to the server. E.g. how to spawn their pawn/character and such

[fluid lichen]

Hello, I started to learn multiplayer programming in UE using these articles:

https://docs.unrealengine.com/5.3/en-US/multiplayer-programming-quick-start-for-unreal-engine/
https://docs.unrealengine.com/4.27/en-US/InteractiveExperiences/HowTo/RespawnPlayer/

and I'm trying to make RespawnPlayer replicated, so I added:

    UPROPERTY(ReplicatedUsing = OnRep_bIsDead)
    bool bIsDead;
    UFUNCTION()
    void OnRep_bIsDead();
    void OnDeath();

void AMultiplayer3PTestCharacter::OnRep_bIsDead()
{
    OnDeath();
}

void AMultiplayer3PTestCharacter::OnDeath()
{
    CallRestartPlayer();
}

void AMultiplayer3PTestCharacter::GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const
{
    Super::GetLifetimeReplicatedProps(OutLifetimeProps);
    DOREPLIFETIME(AMultiplayer3PTestCharacter, CurrentHealth);
}

to the Character class

Also modified the SetCurrentHealth to call OnDeath

    if (GetLocalRole() == ROLE_Authority)
    {
        CurrentHealth = FMath::Clamp(HealthValue, 0.0f, MaxHealth);
        OnHealthUpdate();
        if (CurrentHealth <= 0)
        {
            bIsDead = true;
            OnDeath();
        }
    }

but I never added bIsDead to the GetLifetimeReplicatedProps

And it still works as I expect:

1. server calls OnDeath() then it calls CallRestartPlayer() which calls Destroy()and then it calls gamemode's RestartPlayer for specified controller

My question is how the clients know that the character is dead if GetLifetimeReplicatedProps doesn't have bIsDead variable?

[solid wave]

Hi, I migrated lyra's locomotion for our project and I only use it with the AI character's. Currently it works but only on server, on the client everything is wrong. I did assume that we don't need to replicate stuff for the AI as all the calculation's are done on the animation blueprint, which happens on both server and client. Any idea if I also need to replicate something like they did on Lyra's movement component, even though we use it only for AI? Thanks for any help

[jolly nymph]

greetins i have a problem with my project, i used the online subsystem for to connect my Oculus quest 2 device to my PC, my device as client and the PC as a serve, before works! but now idk why it doesn´t work. may some body can help me

[maiden flame]

@jolly nymph Are you testing with localhost? Does FindSessions trigger OnSuccess or OnFailure?

[pallid mesa]

put a breakpoint on your OnDeath function and see where its called from.

To have a helper on your VS watch, use this:
https://x.com/joatski/status/1645471151097802752?s=20

Also! The client shouldnt call "RestartPlayer", only the server, as its a server authorative action.

[wary marsh]

Noob Question again. I'm getting stuck trying to get a property from player state and replicating it properly. Made a video showing the issue if someone could help point me down the right path that would be much appreciated!!

[dark edge]

that whole loop thing is goofy

[sinful tree]

Text Renders don't replicate, so yea, you don't need to mark it as replicated.
Part of the problem is that you're using the player controller to replicate the name you want to use. PlayerControllers only exist on the server or the owning client, so the server would have both the local player controller and the client's player controller, but the client would only have the client's player controler - this means they wouldn't receive the new name value for the other player.

[wary marsh]

yea thats why i paused I tried so many things my brain is pretty tired lol.

[dark edge]

It should be as simple as:
WhateverTheServersideOnPossessIs -> shove the right playerstate's name variable into the pawns text render

I think OnPossess is serverside

er wait a sec

yeah you want a clientside onpossess, sec

or on possession changed

[wary marsh]

so perhaps better to run this logic on the gamemode?

[dark edge]

no

the pawn has enough info

https://docs.unrealengine.com/4.26/en-US/API/Runtime/Engine/GameFramework/APawn/GetPlayerState/1

That's your getter

now you just need a WHEN

Test, use a timer or delay loop on beginplay, just in the pawn:
GetPlayerState -> cast to YourPlayerStateClass -> pipe the name into the text render

make sure that works

then solve the WHEN problem

[wary marsh]

okeey okeey i'll give that a go.

[dark edge]

The way to approach these problems is to sort of start from the fundamentals.
At any given time, does a pawn on any machine have enough info to know what name to put in its TextRender?
Since pawn can get the corrosponding PlayerState, and those are replicated, and name is replicated within it, then pawn should already have enough info on any machine. No need for any additional networking. You just need to find the right trigger event.

[wary marsh]

I think that was sort of where i started but then probably started chasing a red herring when it didnt immediately work

okee I have it working now. Thanks a bunch!

[storm wind]

Yeah I'm also curious something is broken within the game mode. I'll have a look around. Thanks.

[indigo brook]

Question: How do you isolate your game instance and get information out of it to apply to a specific client?

In multiplayer this is crazy

[sinful tree]

You can only access the game instance of the particular instance that is currently executing whatever event.

[indigo brook]

@sinful tree Maaannnn I tell you, I tried this that and the other thing and for some reason when I try to load that info into my client, it just dosn't happen. I'll get screenshots. I've been stuck on this for a freaking week and pulling my hair out haha

L_Lobby_Multi
-Game mode casts to player controller to spawn third person character
-Player controller spawns third person character
-Server has his clothes
-Client does not
L_Persistent
-When I change clothes in the persistent level, it looks fine in game and replicates...but it does not save
-When I go back to main menu, it's the default save clothing choices

I fixed the save issue for the server, I missed the connection here

Easy mistake, yet, my client still arives naked haha

Net next step is to get the freaking clients charcter info loaded up, having trouble

Any tips based on what you seen in the bp's

[placid flame]

Hello, I was trying to search for someone that could achieve a p2p connection, what are you using exactly to manage p2p? are you truly using a solution without a server? are you keeping the way that networking works in unreal?

Well I'm trying to create a p2p solution, I thought there was no way in doing that while keeping the unreal's networking system.
A partner of mine create a web socket solution with a kind of json format to replicate basic stuff such as locations.

But is there a native implementation to create a connection without a server? I'm still not sure if EOS p2p is just to handle services like invitations and matchmaking.

[fossil spoke]

@placid flame There is no such thing as Peer 2 Peer in unreal in the context of what you want.

Unreal has a Server Authoritative architecture.

There is always a Server

Whether thats a headless (dedicated) or a Player operating as a Host (Listen)

[placid flame]

oh okay, then why is a lot of people talking about p2p? I saw that someone explained that it is a misunderstand

[fossil spoke]

Because people throw terms around without understanding their meaning or provide context to what they are actually talking about

[placid flame]

yeah thank you, that was what I was trying to clarify

[fossil spoke]

EOS does use P2P messaging, but it has nothing to do with the overall server architecture of Unreal

[placid flame]

okay, well we could achieve a p2p solution, but is pretty much recreating the server's code with web sockets, I'd love to see if someone else has any improvements, but I only find people confusing terms

[fossil spoke]

Honestly in my opinion, unless you have specialist engineers and a lot of money, its not worth even trying to introduce P2P as you understand it, into Unreal.

Its gameplay framework is just not designed for it.

[placid flame]

oh is a metaverse, we just need to replicate locations and basic events with no more than one parameter

[dark edge]

Email

Seriously though, your best bet for something that simple will be to just get some sort of communications endpoint in the game and run as standalone on all machines

the game process doesn't know it's "networked", just theres data coming in from somewhere which affects game state. None of the Unreal networking is in play.

[placid flame]

yeah we are doing that, is a standalone solution, and web sockets to send data

[placid flame]

exactly!

[dark edge]

Yup that shouldn't be too hard, depending on what you're actually doing.

[placid flame]

I love it cuz it avoids server and client crashes

[dark edge]

You doing something liek Dark Souls soapstones or what?

[placid flame]

not sure what is that

but well I'm the master in unreal, not in web sockets and backend, I wanted to get some help in order to do it by myself

[dark edge]

they are little messages you can leave on the ground and other people can see them

and vote on them

[placid flame]

I hope so

[dark edge]

"Fort
night"

"Is this a dog?"

"Try finger
but hole"

etc

[boreal bison]

If I want to handle assigning teams, for example, allowing players to select their team in a lobby, where is the best place to actually represent what team the players are on? Right now I'm basically using boolean values that I track within the game instance so that it's maintained when the players move from the lobby to the game level, and then in the game level gamemode blueprint I use the boolean to determine what team the players should be on

but something about that seems extremely flimsy and not the way I should be doing it, even if it technically works

[dark edge]

Team is a part of the state of a player

I'd put it on PlayerState

[boreal bison]

I can put it on playerstate, I just hold it in the game instance for moving levels

but is there a best way to actually represent the teams themselves other than booleans?

I have no idea what best practice is

[dark edge]

Enum, int, tag

[boreal bison]

Enum sounds pretty good

[shy gust]

hey all, with these nodes , do either of them account for players that are still server traveling? or are they just counting the loaded the players?

trying to check for all players to be loaded before starting play.

[obsidian halo]

Only Local Player Controllers can be assigned to widgets. BP_PC_C_1 is not a Local Player Controller.

Im getting this error everytime im doing this

can anyone help me whats wrong

but when i do this the error gets resolved, i just randomly did this but i wanna understand how it got solved

[obsidian halo]

update it was not resolved, but i resolved it now and understood why its giving the error

[dark parcel]

@obsidian halo the begin play will run on every single actor and every single machine

So if u have 5 of your player character instance in your world, you do be running it 5 times on each machine

[obsidian halo]

yes and it will get called on both server and client

[dark parcel]

So u r adding the widget as many times as there are number of instance in the world

[obsidian halo]

yea

[dark parcel]

It will run on every single machine

So what u have to do here is

[obsidian halo]

i did this

[dark parcel]

Only create widget on the actor that is controlled by the local player

Exactly

That will do the trick

[obsidian halo]

yea thanks for the explanation!

[dark parcel]

By doing that, if the character is not owned by the local player, it will just go to the false node, so the widget only created once this way

[obsidian halo]

yes

[bright summit]

Ok I have a problem and have no idea what's wrong. When my bool is changing OnRep function is not being called. I know that it is called when it is changed on the server but I checked it and var is changed in server and client so it should be called but it's not.

.h:

UPROPERTY(ReplicatedUsing = OnRep_IsFullySubmerged, BlueprintReadOnly, Category = "Base Player|Movement|Swim")
    bool bIsFullySubmerged = false;```

.cpp:

```cpp
        if (fWaterLevel >= fFullySubmergedLevel)
        {
            if (GetLocalRole() == ROLE_Authority)
            {
                UE_LOG(LogTemp, Warning, TEXT("Server"));
            }
            else
            {
                UE_LOG(LogTemp, Warning, TEXT("Client"));
            }

            bIsFullySubmerged = true;
        }```

OnRep:

```cpp
void ABasePlayer::OnRep_IsFullySubmerged()
{
    GEngine->AddOnScreenDebugMessage(-1, 15, FColor::Purple, TEXT("Submerged state changed"));

    if (!bIsFullySubmerged)
    {
        // Here will be it fired once?
        GEngine->AddOnScreenDebugMessage(-1, 15, FColor::Purple, TEXT("Player is no longer submerged, we can play particles effects!"));
        OnEmergesFromWater(GetVelocity(), GetActorLocation());
    }
    else
        OnFullySubmerged(GetVelocity(), GetActorLocation());
}

Edit: I have bReplicates = true; and GetLifetimeReplicatedProps implemented

[bright summit]

Ok, had to change this value via Server RPC

should I every variable change via serverrpc if I want to be replicated or only when I want to use OnRep function?

[last storm]

Hey, I have issues with replication:
I defined a value like this:

FWeaponData WeaponData;```

and set GetLifetimeReplicatedProps:
```void AAriseRangedWeapon::GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const
{
    Super::GetLifetimeReplicatedProps(OutLifetimeProps);

    DOREPLIFETIME(AAriseRangedWeapon, WeaponData);
}```

But the value of my structure is always equal to its default value on the client, any idea ?

[chrome bay]

AAriseRangedWeapon also needs to be replicated

Also, what does the FWeaponData definition look like?

[rapid pike]

Can someone help me with this. Why is this setting greyed-out?? I really want to open a client viewport much bigger than these settings.

Now I need to rescale with every play

[crisp shard]

i realize this process will be much more complex than the answer i receive (possibly) but how can i make it so that in a muliplayer open world like game, quests take them to a different instance of that world, so that they are no longer inside the same game world as other players? so that they can complete quests that might trigger thing in world that i don't need/want other players to experience

[chrome bay]

You'd need to send them to a completely different server

Not really much different to a "Hub" style server system where the hub server spools up another game server on your backend, then sends all/required players to it when it's ready.

[crisp shard]

what kind of extra coding would this require? other than the stuff that would be simply needed for that partiuclar world ? would this also be a different gammode?

[coarse aspen]

Hi All! Some help needed with dedicated server. All works just fine, but after some time if no one is playing he game, server hibernates. Players can't connect, unless I press 'Space' button within the server console. Any ideas how to keep server running?

[plush shoal]

Hey just a general question regarding voice chat, is there a specific way you're meant to do it, since the documentation for it is horrible and the tutorials are basically non-existent and don't work

[chrome bay]

I have no idea, depends on your game. The backend/server architecture is hard enough

[crisp shard]

hmmm, well maybe i can get away w not doing any of that and having certain things be not showing for other clients in the world

or maybe have them have like a transparent mask around them when they are in a quest and an enemy ai that pertains to it isn't interactable by the other clients

or maybe even having places that are only access when on the quest. i suppose there are other methods to solve the problem

[brazen anvil]

Can putting certain information on the player state open your game up for cheating? Like for example if you had your inventory on your player state and now that all clients have a copy of your player state they can "see" in your inventory?

[chrome bay]

Assume that any data you send to a client can be read by that client somehow, even if you don't put a mechanism in game for them to see it.

Inventory on a Player State seems like an odd choice to me but obviously depends on the game

[unkempt tiger]

Remember that you can make your inventory replicate under owner only condition, that way other players don't necessarily see other players' inventories (or they can see a part of it, depends on what you want)

[brazen anvil]

Ah ok

[brazen anvil]

I was thinking for persistence since player state handles seamless travel and would keep state between level chanes and disconnections.

[unkempt tiger]

i personally find the idea of putting an inventory on the player state appealing, because that way the inventory naturally persists across deaths as pawns come and go, giving you control over what to do with the inventory should a player respawn. there is also the 'outfit' part of the inventory (which arguably should be a part of the inventory) which other players should be able to see (if your game has outfits), so the pawn can be an external observer and react to changes in the owner's player state

[chrome bay]

yeah very much depends on the game really

[brazen anvil]

I want to aim for a game that kind of combines EFT with Day Z

So I think having that inventory state during the entire game session would make the player state a good candidate?

[lament flax]

how does multiplayer works with anim graph

some states arent the same between client and other clients

[chrome bay]

anim graph has no networking

[lament flax]

mh

when printing in the event graph i got weird results

[lament flax]

you mean by default, or not supported ?

[chrome bay]

not supported, nothing in an animation is network relevant

[lament flax]

because you can see the player running and stuff, and its replicated

[dark parcel]

Anim graph just read values

[lament flax]

so states are replicated

[chrome bay]

They are driven from data that comes from other systems

[dark parcel]

from the character or w/e

the character can have replicated values

liek onCrouch

[lament flax]

so each client gets from server the data ?

[dark parcel]

the graph just read w/e the value from the owner

[dark parcel]

the anim graph just read from it's owner, period

[lament flax]

on what side ?

client or server

[chrome bay]

Both, independently

[dark parcel]

i think there's a bit of misconception when you say that

[chrome bay]

server has no idea about clients animation, client has no idea about servers' animation. They are completely independent

[dark parcel]

it just care about it's owner in it's machine

[lament flax]

because on debug, the animgraph exist on server and client

[chrome bay]

That's because there are two of them, one on the server machine, the other on the client machine

[dark parcel]

everyone have their own version in their own world

[chrome bay]

Assuming you had one player ofc

[lament flax]

okay

the only thing that isnt sync between clients is this aim offset

and i cant find out why

[dark parcel]

U don't just expect things to be in sync

that's your responsibility to check what should be in sync and how to sync them

if you need something to be sync, then it can be a replicated variable (Not the variable inside the anim graph ofc, but the value from the anim graph owner , eg your player character)

[lament flax]

the aim yaw and the aim pitch vars are set in the anim BP, using the character location and rotation

[dark parcel]

that doesn't say much about networking

if you need something to be sync, well then sync it

by reading a replicated variable for example

[lament flax]

isnt the character the same on clients ?

[lament flax]

i'll try moving the logic of the vars to player pawn and read from that

[dark parcel]

not sure what logic and what you mean by that

could be doing something wrong but I can't tell

for something like aim offset, pretty sure there's a replicated value that you can use from the player controller

[lament flax]

doing some math

[dark parcel]

but don't ask me, I don't do FPS

[lament flax]

well it works on the owning client

from other client, you are the default aim center pose

[dark parcel]

debug

find out why the client's pitch and yaw is not updated

you probably didn't tell the server to update the var

[lament flax]

this worked

[dark parcel]

but again, for something like aim offset, im pretty sure there is an existing variable you can use

[lament flax]

from the officials UE docs they do that, so i assume there isnt

[dark parcel]

🤷‍♂️ , ask someone that knows. iirc there is something like that

[lament flax]

these are the only default made vars

[dark parcel]

Unreal is kinda made for FPS game

i mean the engine it self

it would have somehting like that handled

[lament flax]

prob

i am doing a TPS tho

[dark parcel]

same deal then

[lament flax]

maybe because of unreal tournament

idk if UE was used for something else before

[dark parcel]

it's used for all types sort of game

but the CMC it self is made for competetive shooter is my guess

cathered to it

[maiden flame]

They have a default node for yaw or pitch (can't remember which is responsible for looking up and down), which is automatically replicated. However, for sideways aiming, you would have to replicate your own logic from the pawn or similar.

[lament flax]

i mean, when you are a studio and are building games, you either make you own engine or use another one

epic games made their own, and before fortnite i think UT is the real entry point (because it had a level editor really similar to UE4)

maybe it wasnt "epic games", prob another group name, but you see the point

is this a bit to much ?

should i replace this by "get world delta seconds" ?

[shadow aurora]

Anyone know if there's an event on the client that gets triggered when they're disconnected from a server that's crashed? Want to add a timeout message and then boot players back to lobby in that case...

[unkempt galleon]

NetworkError and TravelError in Game Instance

[quasi tide]

A whole crap ton of games. Splinter Cell, Mass Effect, Gears of War, Batman - Arkham trilogy, BioShock, Borderlands, Army of Two, Astroneer...really, all kinds of games.

(Of course Epic's games as well)

[lament flax]

i meant before unreal tournament

what games epic made that required to start making their own engine

before it became a public engine like nowdays

[quasi tide]

UE was made for UT, yes. Beforehand though, Tim made things like ZZT and Jill of the Jungle

[hexed star]

Hi there..

I'm currently struggling with a Problem targeting a SceneCapture2D in my PlayerCharacters.
The Screenshot shows the BeginPlay Setup of the Capturing..

The Select choses one of two RenderTarget textures, depending on the Playr Index of the Session (2-Player Coop.. so 0 or 1).

The Problem is...:
I can't get it to work to have both Players have their own Animated, rendered Texture in their Inventory.. Only Player 1 has it fully working.. bot not the joined Client...

Can one pass me a Hint?

Player 2 simply has a white RTT...

[dark parcel]

@hexed star check if the controller is valid?

[hexed star]

It indeed is..
Calling that from Event Possessed

[dark parcel]

event possesed run on server

u want to check if everything is set in the client machine

[lament flax]

No link with your question sorry, but what plugin do you use to make your wire like this ? (Im not talking about the flat nodes)

[hexed star]

Node Graph Assistant

[lament flax]

Ty

[brazen anvil]

looks like windows 11

[hexed star]

Kmg.. i totally forgot about setzing the right RPC.. thanks

[hexed star]

And Flat Nodes for the Node Style

[lament flax]

Yeah i guessed that

Didnt knew that node graph assistant had an option to change style

[drowsy blade]

Noob question, if I replicate a variable with OnRep and also handle the server side update of the variable. Can I assume that the value in the details view should be correct for clients and server?

[lament flax]

To update a var on server and make it replicated to clients. You have to set it on server side

[hexed star]

OnRep will always be called, when the variable changes on server side, only.
And it will call the moment, the variable got updated on the client.

[drowsy blade]

Yes. So I should expect e.g. count to represent the correct value for each client when inspecting that value in the editor details section.

Why in asking is because i see different outcomes from the UI of a client compared with the value in the details view for that client

[dark parcel]

did you update the UI on rep_notify?

try to print the value as well in the rep notify function

see if the client actually gets an update

[drowsy blade]

Yeah, if I press a button I can get the value to decrement correctly in the UI for both client and server, I must have done something else wrong

Thanks ❤️

[lament flax]

any feedback ?

[lament flax]

and is the "delta seconds" returned by the event tick the same as "get world delta seconds" ?

---

also, when setting a var replication to "owner only", does it propagate to actor components ?

[dark parcel]

similar

[dark parcel]

as for this, there's no context at all

[lament flax]

context isnt, really required, i just need the delta seconds almost each frame

[dark parcel]

event tick -> Get delta seconds

[lament flax]

okay

[dark parcel]

afaik get world delta seconds give an almost same number

[lament flax]

ill make it owner only

[dark parcel]

down to the small decimals

[lament flax]

okay ty

[primal trellis]

Hi guys!
my animations on the client are jittery. Only for the client character, doesn't happen with the host character. Both the client and the server can see the same thing, I will send two example videos (in the last seconds of the first video you can see it well). Does anyone know possible elements that I can check or study to try to find a solution?

More info:

• I'm connecting via Steam
• I'm only using blueprints
• Both PCs and internet connections are good (the problem happens always with the client)
• I used a default thirdperson character controller as a base, but I changed the
  mesh and SK, and created my own ABP
• Using an animation blend for movement
• It only causes problems in the build, the same doesn't happen in the editor

https://www.youtube.com/watch?v=cy43agEjFNE

Editor infos:

[fluid lichen]

@pallid mesa Thanks, really helpful "VS watch", I also had to change the configuration from "Development Editor" to "DebugGame Editor" because debugger was ignoring a few breakpoints when I used the "Development Editor" configuration

Server executes:

Character#OnDeath()
  Character#CallRestartPlayer()
    Character#Destroy()
      Character#Destroyed()
        GameMode->GetOnPlayerDied().Broadcast(this);
          AController* CharacterController = Character->GetController(); // returns NULL in the GameMode for some reason
    GameMode->RestartPlayer(ControllerRef); // calls Super::RestartPlayer(NewPlayer); // NewPlayer is not NULL

Client1 executes:

Character#Destroyed()

Client2 executes:

Character#Destroyed()

Now I see that technically the clients don't see that the character is dead they just react on the server's Destroy()/Destroyed() call ( automatically replicated by the UE's code I think ). Also I'm not sure if it's bad that GameMode's RestartPlayer() runs on the server before each client runs Destroyed() function. Looks like the GamMode's RestartPlayer() is also automatically replicated, because I run the dedicated server with 2 clients and on the both clients I see new Character spawned.

Will check GetController()'s implementation to see why it returns NULL for the character's reference in the GameMode's function

[maiden flame]

@primal trellis It doesn't look like a latency issue, but rather a discrepancy between what the client is trying to do, and what the server is telling it to do.
That's probably why it does not affect the host. Essentially, the client is in disagreement with the server, and the server is constantly trying to correct it.

A typical case for this type of jitter is setting walk speed on the server, but not on the client, or rotation rate on the server, but not the client.
To remove jitter, you have to set whatever you intend to replicate (e.g. walk speed float) on the server and locally to make them synchronize.

[primal trellis]

Thanks for answering!
I just didn't quite understand the ending: "to remove jitter, you have to set whatever you intend to replicate (e.g. walk speed float) on the server and locally to make them synchronize."

What I understood is that the server should take care of everything and then replicate the information to the clients

But in your example, so I have to make everyone, e.g. take care of their own speed and then I make them synchronize it?

What would be an example of how I could set this walk speed correctly?

(sorry for the possible doubts beginners, it's my first multiplayer)

[maiden flame]

Basically, if walk speed is not synchronized, you can fix that by setting the walk speed on the client, and on the server.

The server has authority of course, and should handle all gameplay events, but we can help it by settings things locally. As long as the server agrees with what we set, there should be no discrepancies.

[shadow aurora]

If I've got an actor that's out of relevance, and teleport in to relevance, is there a way to not play an audio component attached to it from the start, and instead pick it up where it would be for folks who were in-range the entire time?

[primal trellis]

Okay, I'll try to do it this way. Thanks for the help!!

[halcyon mural]

Can someone summarize multiplayer for me? Like the different aspects of it and how it works on a technical level? Just so I have a better understanding of multiplayer as a whole and how it functions in a game

[maiden flame]

Hmm @shadow aurora. I don't have experience with that, but what about saving a timestamp of when the audio started playing, and once it comes into relevance, we check how long ago it played?

[wanton bear]

hey everyone, how do you deal with primary data assets in multiplayer

i have a player who selects a building which sets a data asset variable to the one theyve selected, then i want to replicate which one is selected on another client. should i just replicate the variable or the asset id or something else

[lament flax]

hello

[lament flax]

data assets cant be replicated (well, technically yes, but you have to do some c++ stuff and its not that easy)

i also ran into this issue, what ive did is made a struct using some info that the data asset holds, and use that struct to be replicated

[wanton bear]

that seems incredibly wasteful if its static data no?

[lament flax]

example

[wanton bear]

i was considering just sending one key bit of info so i can search through all the assets to find the right one

[lament flax]

well, DAs are UObjects
and UObjects arent replicated

[urban moth]

UObjects are replicated as anything else

[lament flax]

i aslo thought about that, depending on the amount of DAs and your system, maybe saving a struct var is beter

[lament flax]

no, because replication goes through actor channel

that only actors and actors component have

more info here
https://jambax.co.uk/replicating-uobjects/

[urban moth]

//~UObject interface
virtual bool ReplicateSubobjects(class UActorChannel* Channel, class FOutBunch* Bunch, FReplicationFlags* RepFlags) override;
//~End of UObject interface

do your homework man 😉

[wanton bear]

would replicating primary asset id work?

[lament flax]

idk, test

[lament flax]

i didnt specified it wasnt possible, UObjects arent replicated by default

as i said earlier, you can make it replicated

there is even plugins to do that automatically

[vagrant grail]

I have a variable in the GameState set to array replicated, and when trying to print its content by the host of the game it has the right content, however when I try to print its content by the client it doesn't have the same content, why is that ? I print that in the Player Controller like this

[lament flax]

i just stayed with struct to be more clean

[lament flax]

show how you add stuff to array

[wanton bear]

seems like you're using up bandwidth for no reason though

[lament flax]

less than if i was replicating a DA

my inventories are small so i can allow this

[wanton bear]

but you dont need to replicate data assets? everyone has the same data assets on their systems

[lament flax]

because my inventory only needs some part of info, so i can control what i give him

[urban moth]

sure he does not do that.. you're absolutely correct

[lament flax]

you asked to replicated data assets ?

[wanton bear]

no, replicate which data asset the first client is pointing to

[hollow eagle]

You're incorrect here - assets are replicated just fine. Their data isn't sent over the wire, a reference to their path (and sometimes a guid, depends on the situation) is.

Anything with a "stable" name (so... any asset on disk) can be replicated this way.

[lament flax]

didnt know that

the ref is still null if i remeber correctly

[wanton bear]

so i can just replicate it and itll work? i assumed itd have to be loaded or something

[lament flax]

thats the issue i had

[wanton bear]

im new using data assets so

[hollow eagle]

In general, replicating a pointer to something isn't replicating the data inside that pointer. It's replicating a reference to that object (which would need to exist on both sides already). This is super important for assets.

[urban moth]

exactly.. as I said before, @lament flax please do your homework. your advices could be quite misleading

[wanton bear]

interesting, thanks for the info siliex

[wanton bear]

this in particular i didnt know

[wanton bear]

i may be wrong, but i think arrays only replicate when you set them rather than add items

[vagrant grail]

source ?

[wanton bear]

i believe this is something i ran into before a couple of times

i ended up doing a rep notify with single variables and then on the notify i added it to the array

[urban moth]

arrays are replicated as any other variable.. just be careful that out of the box, whole array will be replicated which could be a real deal for a bandwidth

so if you have a bigger array(or array which tends to be bigger in the future), you could think about FastArraySerializer(c++ only)

[vagrant grail]

so how to fix my issue then please ?

[lusty sky]

Are you printing array at begin play?

[vagrant grail]

No by pressing the "P" key

[urban moth]

hard to say. Your snippets are not quite verbosive. That picture with a begin play is ment to be run on what? On server? On client?

[lusty sky]

What does the output look like ?

[vagrant grail]

I think gamestate runs both on client and server each having their own instance ? The goal of it is to retrieve the data from the GameInstance and copy it in the GameState as the GameInstance isn't replicatable

[urban moth]

sure but you have to do that on server, not on client.. so you have to check Role e.g. HasAuthority

[vagrant grail]

This is the print in the Lobby (that's where the host enables / disables roles to set up the game) and it prints the same on the client and on the server

And here (still in the lobby) I disabled all the roles for examples except 2 then start the game

On the left side it still printing all of them because I'm still getting the GameInstance values which is not where I save when I enable / disable roles as I save that in the game state (in the next level being where people would play)

[urban moth]

man I mean NETWORK Role 😄

[vagrant grail]

Now I'm in the next level (so no the lobby anymore) and press P and it prints only the 2 enabled roles, so that's all good on the host side

However on client side it's still printing all the roles

[vagrant grail]

I'm not sure to understand what you mean ? 🤔

[urban moth]

https://dev.epicgames.com/documentation/en-us/unreal-engine/actor-role-and-remote-role-in-unreal-engine

and this is a practical usage in BP
https://wizardcell.com/unreal/multiplayer-tips-and-tricks/#51-filter-by-netrole

[vagrant grail]

But in this case it's the gamestate, so I don't really know who owns that actor but I guess the client has its own version of it and the server too

[urban moth]

Server owns it

[vagrant grail]

And as I'm printing that in the Player Controller, it's owned by the owning client if I'm not mistaking

Ok then doing this fixes the issue

[urban moth]

that's correct(sort of.. PC is autonomous proxy, but for a sake of a simplification yes, client "owns" controller).. Server owns gamestate which is replicated to all clients.. but only server should do changes in there.. means when you want to replicate something to all clients, so you have to check HasAuthority() and make changes only when you really has an authority otherwise there is a solid chance that server replicates your variables correctly but you erase them by local version

[urban moth]

so you're fine now right?

[vagrant grail]

Oh it makes sense, thank you so much 👍

[vagrant grail]

Yeah thank you 😄 👍

Another question : How would you test something like in my game where I need to distribute all the roles in the game (there are 16 roles so 1 per person) without having to open 16 clients window ? 😄

[lament flax]

from server print ?

i would rather open a couple of time the 16 windows to be sure each clients know what they are

[vagrant grail]

I'm not sure to understand

[urban moth]

what is a purpose of that test? what do you want to achieve?

[vagrant grail]

Just to be sure that every role is distributed properly (and then later when I will implement the mechanics of each role) being able to test those because my game will have alot of intricated things with other roles)

[urban moth]

so it means your game always need to be played by 16 players right

[vagrant grail]

No

you can play with how many players you want (I need to set up a minimum still) and the max is 16 players. So depending on the amount of players and the amount of enabled roles, the game will distribute those roles so everyone has role and if there aren't enough roles to give to everyone because the amount of enabled roles are lower than the number of players in game I will either fill that by giving simple roles like Simple Villager and Simple Werewolves or I will give certain roles multiple times.

I will create a setting for that to let the host choose which one he prefers.

[urban moth]

so you answered your question by yourself or?

[vagrant grail]

No because that was not the question 😄

I will give you an example : There will be a role that will make the name of someone being killed being displayed to only certain roles and other roles will see that name being blurred / censored. So I have to make sure that every role I wanted to see the name being able to see that name while others must not see the name, so that's a reason why I need to test it with alot of players to see all the roles and if my programming skill succeed doing that.

[dark edge]

Get a couple computers, have each of them open the game a few times, have them all connect

if you just open the game and not the editor you can have quite a few no problem

[urban moth]

I could say you something about
https://docs.unrealengine.com/4.26/en-US/API/Runtime/Engine/GameFramework/AActor/IsNetRelevantFor/
or implementing a rule in your ReplicationGraph(filter certain connections)
but I think that for your own sanity just replicate kills on all clients through GameState and filter it on client's UI.. I know it could be hacked, but you can tweak this later

e.g you will replicate to each client that player with role A gets killed.. and on all clients you will do some check if (KilledRole == MyLocalPlayerRole) do this.. else do nothing..

[vagrant grail]

But it doesn't answer my question 😄 Like here I'm referring to a need of having a lot of game instances opened to do games alone by testing different combinations of stuff and see if my code breaks or not, and if I'm not mistaking Unreal only allows 4 window instances and it's already burning my computer in terms of performance 😄

[urban moth]

ok, soo.. you wanted to test combinations of roles.. so hows about Excel?

why you need to test it in a game.. it is not a network related problem. it is a design

[vagrant grail]

Because there's a big differnce between theory and in practice, so that's why I need to test in game

[urban moth]

sorry, dont get it.. well good luck man 😉

[vagrant grail]

😄

[maiden flame]

Just test with the minimum amount of players needed, and test combinations for all roles. If it works with four clients, it should be scalable and work with more.
If you need to test with a lot of players, test with LAN using multiple packaged instances to reduce performance load, maybe with two computers.

Make friends help you.

[vagrant grail]

Alright thanks I will try that (tho I don't have multiple computers :D)

[vagrant grail]

friends ? What's that ? 👀

[maiden flame]

I have heard you can make them 😉

[vagrant grail]

those are rumors only ... 👀

[hoary spear]

Cant you spawn a bunch of pawns and test your logic on those in a non replicated scene ?

If you're worried your distribution of roles is incorrect. Test it in a minimal environement.

No replication, just a bunch of Actors

Can test 10 roles , 15 pawns and vise versa (dont need no real friends for that. Can use fake friends. Fake friends are nice)

@vagrant grail

[west cairn]

Noob in need of some help with replication and ownership in the context of simple tutorial task.

The task is to make a simple button press animation and have it be replicated to all clients(ultra small demo task, not worried about net cull or any distance gate, consider all of that well past my current level of understanding and demo requirements)

I have so far: Made the button press BP, added static mesh, collider box, added logic for collider component overlap, added simple timeline and anim logic for button as well as getting player input and allowing the button to be pressed by "E".. all of this is contained in my BP_Button - How should i go about sending an RPC to the server that the button press has taken place? I have tried creating a variable bool and passing this to server and an OnRep function without success(probably incorrecly mind you)

This all takes place on BP_Button - I tried to add in server logic and RPC here but failed. It feels like maybe I have not understood the problem well enough or making a basic mistake i think

I really wanted to have the client just toggle a bool and then have the server replicate the animation entirely too all clients

[twin juniper]

Did you try a rep notify using that bool variable?

It helps with visual things that are changed by the server but the clients need to see

Instead of just replicated you do rep notify and handle the animation in the function that it creates

[dark edge]

Have the client call an rpc
rpc toggles bool
bool onrep plays animation

If it's a pawn and a button actor, it'd have to be like this:
Pawn:
Input -> RPC
RPC -> get button -> toggle bool

Button:
OnRep_bool -> call event OnBoolChanged
OnBoolChange -> branch on bool -> enter timeline

you can't directly have a timeline inside an onrep, that's why you need event OnBoolChanged

[west cairn]

I am too embarassed to post the photo of my blueprint

🥲

So lets try this like a computer might, line by line.. Kaziie, I will attempt now to create a rep notify using the bool Is A

[dark edge]

Start with the bool in the button.
Set up your button so that
Begin play -> branch on authority -> bool = !bool -> 3s delay -> loop back

put a print string on the onrep for the bool. print it, make sure everyone agrees its flip flopping

then just directly set relative location in the onrep

then add an event so you can use the timeline instead of instantly snapping

[west cairn]

I appreciate this super detailed and fast reply Adriel!!

I think i got to about here before I cannot follow

So far i am clear on lets try to make Is_A a var, then set this variable to a RepNotify replication type. However further steps are unclear

[dark edge]

not at all

ignore input for now

remove all inputs from the button

you need ownership to call RPCs through an actor so putting inputs on the button isn't a great idea.

[dark edge]

what are you setting IsA to on begin play?

you should set it to be NOT(IsA)

and also loop that delay back into the set

so it keeps flip flopping

[west cairn]

I dont know how to do the test loop youve specified but the OnRep print string is working

[dark edge]

that doesn't check if A is true or false

[west cairn]

Hmm? im not sure i follow

Why dont we just remove the test loop and focus on the onrep?

[dark edge]

because you have nothing driving the onrep

get the test loop going

i literally just handed you it

[west cairn]

Hah! im sorry i am quite dense

I dont get it 🙂

[dark edge]

Do this

#multiplayer message

[west cairn]

OnRep appears to be working

[dark edge]

ok show what you got right now

[west cairn]

Looks like more functionality on the same test. ButtonPressed or "True" or "False"

i dont really get the difference

[dark edge]

false means Button unpressed

[west cairn]

the main issue i think is i dont understand how u mean to loop back over that delay

[dark edge]

just drag the execution so it loops forever, flipping the IsA from true to false to true to false to true to false forever

[west cairn]

Yes false would mean state of the button is depressed((like me working to learn netcode))

[dark edge]

false is button NOT pressed

I wouldn't call it Is A though, call it ButtonIsPressed or whatever

IsA doesn't mean anything

Once you understand this, change the onrep to move the button to a different spot DEPENDING ON THE BOOL

[west cairn]

I see what you mean on the looping delay! ugly as sin but works like this right? :

[dark edge]

Onrep -> if bool -> true -> button position should be down
-> false -> button positon should be up

yeah it's just a quick and dirty loop, you could use a timer but this will work

[dark edge]

Better than the branch is to use select though

yup that's perfect

dirty but gets the job done

so now you got a flipflopping bool, now make it do something visible rather than print a string

[west cairn]

Man why is visual scripting so obtuse 🥲 !! I want to write the word "for" so badly it hurts right now

[dark edge]

there is a for loop but that wouldn't help you here lol

[west cairn]

This bool is also server side i can see from PIE

which is good news!!

[dark edge]

yes it's server side, and gets replicated to clients

and the onrep fires when it changes

[west cairn]

Understanding this flow has been so tricky w/ docs alone - i will attempt to use custom events to call the button animation now with onrep?

[dark edge]

Now just snap it to position

do animation later

onrep -> set local position (select position based on bool)

select node is what you want. it'll pick one of the vector inputs based on the bool

you can also select on enums too, it's templated for all sorts of stuff

[west cairn]

In my image above for the loop - we are setting Is_A = False, i have yet to get that flip flopping like you had wanted to achieve

hmm

[dark edge]

isA -> NOT -> Set isA

[west cairn]

I dont follow this last instruction

[west cairn]

How do you access the logic gate functionality?

I am not seeing any NOT or logic gates familie to select from

[dark edge]

Do you see how this works?

[west cairn]

OK! Makes sense line for line in pseudo style : Get Is_A, Invert its state with the NOT, then use that state to Set (With OnRep)

The Pick_A var into the select vector is something new may take a few minutes - set rel location i see you've chosen to simplify inplace of the timeline , for testing i assume?

[dark edge]

yes, crawl before running

since timelines can't run in a function then you'll need a new event and also need to handle trickier situations like what to do when you release button before timeline is done etc

[dark edge]

After, this, the final timeline version will probably look like this:

and that'll be it

button done

now you need to handle the path between the clients input and the bool being changed

but get button done first

[west cairn]

For this you mention the client input, at that point we may be adding to our character BP?
Heh but first let me get caught up a bit more! so far we've got the server's rep notify loop working and this is being replicated correctly to all clients connected

(In case any other new people wish to follow along)

AHHH so even better yet i see you've used the Is_A var to select a home , or displaced vector in the Select Vect function! very clever wow . i kept asking myself why cant we just use timeline in our OnRep Functions!

[dark edge]

Yeah the best way to think about multiplayer is "What is the least amount of state or events that need to replicate to make the end result the same?"

In this case, it's just a single bool

[west cairn]

After using the Select Vector test to confirm the behavior is replicating, i see you have extended out to a custom event driven from this bool to get that timeline node back

[lament flax]

Hello

Some context about my issue :
when i equip a weapon i change in the anim BP the pose (this pose is replicated to all clients)
i am shooting a line trace from server, the linetrace start is using the world location of a actor (that is attached to a player mesh socket)

when i debug the linetrace, i looks like that for the server, my actor is next to between my player legs (instead of his arms)
how can I debug this to find the issue ?

the pose is replicated between clients, so my server should have it to
the actor is spawned and attached for all clients, so the server should know it to

[wintry forge]

Hello everyone, I have a system for turning the brake lights on and off. If the client connects to the game later and the brake light is on at this time, the client does not see it. I used RepNotify for this and it works. When the client connects late to the game, it sees the Brake lamp without any problems, but I don't understand what should I choose in the Replication Condition, can someone please inform me?

[sinful tree]

The replication conditions are there for special cases where you may want to limit the replication. In this case, you probably just want to use "None".

[wintry forge]

I understand, thank you very much.

[west cairn]

https://docs.unrealengine.com/4.27/en-US/InteractiveExperiences/Networking/Actors/Properties/Conditions/

Old docs but maybe helpful for giving you an idea of the this function in older engine ver

[sinful tree]

An example: Let's say you have your brake lights being client predicted (you're setting the bool true/false locally on the client first before sending to the server) and in that case you could use the "Skip Owner" option to then not override what you've already done on the client that owns the actor that has the bool.

[wintry forge]

Yes, I understand it much better now, it makes sense, thank you for the example.

[wintry forge]

Thanks for the source, I'll look into that.

[west cairn]

As predicted there is no way for the client to access the bool but this is where I was able to get the button task Adriel! Thank you very much for the kind explanation

[dark edge]

Yes because a timeline cannot exist inside a function

[dark edge]

The part in the button looks fine

now all you need to do is change the button on the server at behest of a client

Simplified, it'd be like this

In Pawn:

Input -> run on server event //call it Interact or whatever
Interact -> determine what button to talk to (line trace, get actor of class, sphere trace, whatever) -> change its bool

Done

The simplest setup would be this. This is literally ALL you'd need.

in pawn:
Input -> run on server event
run on server event -> get actor of class Button -> swap its bool

Do that for now.

[west cairn]

I have been stuck there a bit >.<

Even just your delay loop is a great bit of logic that gives me a lot of cool ideas

you could animate a wind mill, use net cull to keep the distance player relevant and voila , really cool server side animation replicated to all clients

Any mechanical structure could be effectively done i think this way

for level design etc, its more than a test loop 🙂

[young spoke]

in PIE with "Play as Client" selected, i notice that calling ServerTravel() from my GameModeBase doesn't bring the connected client with it?

[fossil spoke]

Have you enabled Seamless Travel?

[young spoke]

no

[fossil spoke]

Well thats your problem

[young spoke]

ok thanks, will give it a shot

[crimson ore]

How do you replicate an array of plain UObject in C++ ?

[formal solar]

I thought it was the opposite, that seamless travel didn't work in PIE?

[sinful tree]

Assuming you've set up the Uobjects to replicate, the array should be able to be marked as replicated and have references to the replicated objects.

[crimson ore]

would this not need a ReplicateSubobjects in the owning actor for every element of the array ?

I'm talking about replicating plain UObjects by overriding IsSupportedForNetworking

[maiden flame]

Try this one Fishy https://forums.unrealengine.com/t/projectile-start-location-on-dedicated-server-not-the-same-as-client/261064

[hoary spear]

That ones a bugger ;p

[lament flax]

Im working everyday day a few hours so yeah bugs are regularly happening :)

Its nice that people are willing to help others

[hoary spear]

Wish i had more time to sink into it lol. Kids change everything , atleast the first decade

[lament flax]

Make them learn UE

[hoary spear]

To smol yet

[formal solar]

So weird - if I use the default 'player start' actor in my game I get 'ghost' units spawning on the server corresponding to player starts that players don't use - if I change to use a customplayerstart actor that I created the problem goes away

[lament flax]

this fixed my issue, ty

[maiden flame]

Sweet

[obtuse field]

Is using PendingData num for Buffer size safe?

[lament flax]

i am creating a dynamic material instance and saving it in a replicated var on server
then later on, on server side i am trying to access this var to update a vector param
i get no errors, but the material didnt change on client

did i do something wrong, or materials cant be replicated on server ?

[maiden flame]

Is the variable/parameter being updated on the clients?

[lament flax]

is this true ?

[lament flax]

no

i think dynamic material instance are unique per client (and cant be shared ?)

1 - on server
2 - on server
3- to all clients
4- clients

on 4, the var is null (on server its not null)

[maiden flame]

I don't think it is an issue with material instances, but obviously your client needs to get the data from the server somehow, so all clients can set their material locally and match it to the server state.

[lament flax]

well thats what i show in my screenshots

[maiden flame]

Sorry I'm too lazy to try to solve the specifics of it xD

[lament flax]

no pb

[maiden flame]

You're saying the index returns 0 on clients?

[lament flax]

the material dynamic instance is null on clients when setting it on server

[maiden flame]

Oh. So when you set MaterialDynamicInstance with RepNotify on the server, clients get a null reference?

[lament flax]

on rep of the material var its called once on server

not clients

thats why its null

[maiden flame]

Got it, just confirming. That's kinda interesting though.

[lament flax]

thats weird

idk if its a net issue or the MDI cant be replicated

[maiden flame]

How about... instead of setting the MaterialInstance with a notify, just use a boolean notify, which triggers an event on the client outside the notify?

And that sets the material instance locally.

We only care about getting the index from the server afterwards.

[lament flax]

found this in a forum of 2022

[maiden flame]

Good to know!

[lament flax]

i see, on the onrep of the bool i tell to each client to set its DMI

or i can do a mutlitcast

[maiden flame]

Indeed. I'm sure it could be optimized more, maybe you can call the client side event using the Status RepNotify variable. Of course, you will need some logic in order to select the correct material.

[lament flax]

since its a temp gameplay thing

this works perfectly

[maiden flame]

Hmm, possibly. I think it might be safer to stick with a notify, as materials are a state related thing usually.
But if it works, it works. Just make sure clients who come into relevance, or join later are updated.

[lament flax]

true

updated to using a repotify bool, works better

[maiden flame]

What about this? Cleanest solution I can think of. Not sure if it would work, but worth a try I suppose.

[lament flax]

thanks for helping

[maiden flame]

Np!

[lament flax]

the issue with that is that i will create a bunch of materia instances

i did this :

[maiden flame]

I don't mean replicate the MaterialInstance variable, just set it once for each client.

[lament flax]

yes

but i am chaning this var when i shoot

so with your setup i will create a new DMI at each shoot
with mine i create a new DMI at begin shoot, and use it until the end

[maiden flame]

Ah, then it makes more sense.

[vagrant grail]

I'm not sure to understand how to do that 🤔

Is there a way to know when all players were teleported from the lobby to the main level ? I need to be sure that everyone is there before giving roles as I need to know the amount of players in the game

[hoary spear]

Cant you just hand out along the way?

Doesnt make much difference

Can players join after the round starts?

[vagrant grail]

Right now yes, but maybe later it will if I need to give a certain amount of roles left depending on the amount of players in the game (like the distribution between the amount of werewolves compared to simple villager roles)

[vagrant grail]

Yes but they will be in spectator mode until next round

[hoary spear]

So no

Logically you do the same wether you know or font know the amount of players

If roles remain, give role

Else handle according to server rules

[vagrant grail]

it's so stupid if Epic didn't put like an event "OnEveryoneJoined" or something like that

[hoary spear]

Who is everybody

[lament flax]

i made a goal count, at each connection i add 1 until i meet the goal count

[vagrant grail]

how do you get the goal then ?

[lament flax]

well in your case you just have to get the nb of ppl conneced to lobby

[vagrant grail]

and how do you transfer that value from the lobby to the game level ?

[lament flax]

using game state (or instance i dont remenber which persist between levels)

well its depends of other stuff aswell

for eg if you have a matchmaking

[vagrant grail]

right now I don't have matchmaking, it will be people inviting their friends to play with only

[shrewd ginkgo]

I want to make prophunt mechanics but I couldn't find how to replicate the set skeletal mesh. because my English is not very good and because I'm a beginner on unreal engine, I would appreciate it if you explain step by step and in detail as if you were explaining it to an idiot.

[vagrant grail]

Beginner on unreal and doing multiplayer game ? 👀

[shrewd ginkgo]

I assigned set skeletal mesh to be triggered with beginplay event but replication is not working

[shrewd ginkgo]

I know it's absurd, but it's not impossible, is it?

[vagrant grail]

not impossible but it's a high risk of failure. It's like someone brand new to architecture / building and saying that he's gonna build a castle 😬

[shrewd ginkgo]

I don't care much about making mistakes, after all, I am developing a project for learning purposes rather than a commercial business.

So, can you help me with the above problem? 🙂

[vagrant grail]

Start with a solo game first to learn because you will need those basics to do a multiplayer game (for learning or commerical purpose it doesn't matter)

[visual mountain]

Been trying to setup a listen server and just wanted to make sure I understand correctly. If the host is on the server does this mean they replicate independantly without needing further replication? By and large do I need 2 separate lines of code for host and client?

do you mean like islocalcontroller?

[gloomy tiger]

Can you show the beginning of the blueprint that chains to this piece of code?

[shrewd ginkgo]

I simply connected it to event beginplay

[stoic lake]

How do i check if the owning player is the server on a widget?

[hoary spear]

Any server check should return true

"IsServer"

[formal solar]

Wasted 10 hours because I didn't know 'sets and maps cannot be replicated'
Questioning my understanding of the basics thinking I was missing something incredibly obvious

Will the order of player states in the default 'playerarray' in gamestate be consistent, no matter what client i access the gamestate from?

I'm hoping so

[hoary spear]

I dont think so

Its locally maintained iirc

The playerstates are replicated, but the playerarray in gamestate is not

@formal solar

[formal solar]

ok ty

[hoary spear]

You can assign id's to the playerstate itself tho, so you can find the correct order if you wanted to

[formal solar]

Cheers for tip, stressed myself out today but at least I figured out what the problem was, going to restart tomorrow

[lament flax]

for some reason, the var seems not replicated

the route is :

1 - set the var on server
1 - call event on owning client
2 - call another event on owning client
3 - get back the var (buts its null ?)

i am in the player state

[hoary spear]

Var is not replicated yet.

Use onrep for tjis

[lament flax]

okay

is the player state created before or after the pawn ?

[half iris]

Can someone confirm an assumption I am running with in regards to using print strings when debugging multiplayer? I assume we want to add a print string for every set of functionality that has some effect on the other clients/server right?

This way when looking at things like crash logs, we would have more oversight on the different steps a client has/has not gone through

[tardy fossil]

whoa setting the CMC's tick rate low, the character mesh absolute and then lerping between position updates seems to work fine network wise... i wonder if theres any hidden consequences

[formal solar]

well lower tick rate is usually choppier movement

and less accurate velocity/physics calculations and stuff

[thin stratus]

Server Side probably before. Client side you can't know. Replication can cause a race condition

[lament flax]

yeah it turns out its before

[quasi tide]

If I recall correctly, the PC creates it in like PostInitComponents or something like that

Indeed

[vagrant grail]

How does Among Us create games with a code that people can share to their friends to play with ?

[obtuse field]

What do you mean share code?

You mean mods?

[vagrant grail]

No

[vagrant grail]

I mean this

[obtuse field]

Sessions?

[vagrant grail]

?

[obtuse field]

Does among us make it like warframe? So one player become a host, and rest can join for the game?

[vagrant grail]

Yes

[obtuse field]

So, you create listen server

There is a plugin to make it even better called Advanced sessions

Its free

[vagrant grail]

Already using that but my question is more related to how to do this code system where people have to enter that code in a input box to join that sesssion and making sure that code isn't a duplicate of another session

[obtuse field]

My quess would be to make some centralised server, e.g. in Node.JS, that talks to Unreal via Websockets. Now, when you host session, you send the reqest to the central server, and then it puts your code into the dictionary [key, host ip]. Now, when you enter the code, it talks to central server, it gets the ip associated to the code, and return value with ip

That would be without steam sessions. With steam sessions, idk, never worked with it. Maybe it has some built in api

[hoary spear]

^

Sounds reasonable

[vagrant grail]

I guess the Node.js and Websockets parts are done through C++ ?

[obtuse field]

No

You can actually use any Websocket server

C++, Rust(my favorite), Javascript etc.

Node.JS is just the easiest one imo

Websocket is a network protocol

But, Unreal has a built in web socket client api

So its shouldn't be very hard to do

[vagrant grail]

No like I'm talking in Unreal, can I do the link between that central server using Blueprint or must it be done in C++ ?

[obtuse field]

I've done this several times

[obtuse field]

You can use blueprints:
https://www.unrealengine.com/marketplace/en-US/product/blueprint-websockets

[vagrant grail]

Thank you 👍

[obtuse field]

But I'm more of a C++ guy

[obtuse field]

Also

Before you start

[vagrant grail]

Good to know that you're a guy (as somehow I thought you were a girl) 😄

[obtuse field]

You might want to take a look at Socket.IO, that is wrapper around websockets to make them even easier to use

[obtuse field]

lol

https://github.com/getnamo/SocketIOClient-Unreal

[obtuse field]

Some people even called me a femboy for some reason(but not on this server). Idk what's with people feminizing me

[vagrant grail]

Because of your name 😄

[hoary spear]

HiveMind just makes me think of some alien swarm

[obtuse field]

Correct

[gloomy dune]

Hi, has anyone encountered a similar problem?
In ABP I set the AimRotation value depending on whether the player is locally controlled or not. Then in the CalculateSpineYaw function I take the player's transform and invert the Yaw. The problem is that on the client the Yaw value is set correctly, but on the server and simulated proxy it is equal to zero. As I understand it, the problem is that on the server and on the simulated proxy I get a zero transform. Does anyone know what the problem is and how it can be fixed?

[nimble snow]

how would I use repnotify to play an animation?

[fossil spoke]

@obtuse field Did Sockets end up helping you reach a better solution to your chunk streaming?

[lost inlet]

or just HTTP which also has things like VaRest for BP

no need for WS at all for that

and Node.js never dies huh

[obtuse field]

Still working on it

Needed to make some research on serialization etc.
Sending data trough TCP is working, not just to do things with the data

[obtuse field]

Btw. is there a way to make serialization with templates?

Can I somehow promise unreal, that << will be valid, or make it to check by template provided type at compile time?

Something like that

template <typename  T> void SendBytes(T& Data, APlayerController* Destination)
    {
        TArray<uint8> Bytes;
        FMemoryWriter MemoryWriter(Bytes);
        
        uint32 NumBytes = 16;
        MemoryWriter << NumBytes;
        MemoryWriter << Data; //problem

        MemoryWriter.Seek(0);

        NumBytes = Bytes.Num();

        MemoryWriter << NumBytes;

        int32 BytesSend = 0;
        if(!Connections[Destination].Socket->Send(Bytes.GetData(), MemoryWriter.TotalSize(), BytesSend))
        {
            UKismetSystemLibrary::PrintString(GetWorld(), "SEND ERROR");

        }
    }

[obtuse field]

Ok, so I tested it a little further, and its possible

Idk why it didn't work earlier

[short arrow]

You said you were using unreal and advanced sessions, Websockets seems more appropriate, but you could accomplish the same thing using the "extra settings" option that Advanced session comes with.

When creating a session add an extra string setting which contains, the code you want, and then when searching for sessions, search for that particular setting, and then join it if found

[vagrant grail]

But there isbstill the issue of duplicates I need to handle through websockets I guess

[short arrow]

It's the same thing, you could search through the current sessions and see if any are already using it, because of that I'd try to make the code atleast 10 characters to minimize the chance of duplicates

It really shouldn't be a problem unless you're game gets massive unexpectedly

But I did say from the start It's not the best method, but a quick one

[mild lynx]

In Blueprint, I have a Rep Notify on Begin play to get the Steam ID of players based on the Player State. I send a RPC to the Server and have the server Call Rep Notify. In my case, it's working for players who are already connected, as they can see the names of people who join, but for people just connecting, it doesn't set any of the names of people who are already there.

Get Unique Net ID from Player State is Retuning Invalid. What should I do to fix this?

[mild lynx]

I think I got it working. I just had the Server do a Validity Timer check on the Player State Unique Net ID until it was Valid, then had the Server update the Rep Notify with the Name Result.

[dark edge]

how does one have a rep notify on begin play?

[mild lynx]

Sorry, I meant I was changing the Rep Notify Variable on Begin Play

I have a Controller validity check if local, then after that, it calls the Server, which checks the Player State ID, and if that's valid, it sets the String Variable which is rep notify.

That seems to work

[sonic obsidian]

Has anyone had a crash because of this i keep getting crashes (AWorldSettings* ULevel::GetWorldSettings(bool bChecked) const { if (bChecked) { checkf( WorldSettings != nullptr, TEXT("%s"), *GetPathName() ); } return WorldSettings; }) Call stack was showing stuff about HLOD's and LOD's im only getting this problem after setting up world partition.

[static lava]

"While we can predict GameplayEffect application, we cannot predict GameplayEffect removal. One way that we can work around this limitation is to predict the inverse effect when we want to remove a GameplayEffect. Say we predict a movement speed slow of 40%. We can predictively remove it by applying a movement speed buff of 40%. Then remove both GameplayEffects at the same time. This is not appropriate for every scenario and support for predicting GameplayEffect removal is still needed. Dave Ratti from Epic has expressed desire to add it to a future iteration of GAS."

Is this still true?

I'm trying to create a slow GE, and it is predicted correctly one apply GE_Slow

but when It is removed the character rubberbands back

or as Dave Ratti has left epic i'm out of luck?

[steady musk]

Hi Matt. Have you found a good way to do this?

Seems like I can go with smth like
FCustomStruct.NetSerialize(Ar, Map, bOutSuccessLocal) + forLoop iterating array
But maybe you found a better way of doing it?

[fossil spoke]

FInstancedStruct has a NetSerialize function. Just call that on all elements of your array. Also, if you look at towards the end of the NetSerialization header, there are a couple of helper functions for exactly this scenario.