multiplayer

[keen adder]

Ohhh. So I should prob check for ownership and stuff

That makes sense

[quasi tide]

It could be that you're running in single process mode (which can make some stuff screwy) as well

[hoary timber]

friends, I'm using SetViewTargetWithBlend() function on another class, in a first person multiplayer game, but once the transition happens, I can see my players multiplayer mesh, The mesh on Character Blueprint is marked as Owner No See. Since the function it's Player Controller target, it seems like due to that the player controller doesnt own my character anymore? any way to geet that working?

So basically, I use an interface to interact with a class, through interface I pass Player Controller reference, and from that class I use the SetViewTargetWithBlend, should have this been done differently?

[keen adder]

Oh? I just got the default setup here

[quasi tide]

It would be in your project settings, not there.

If you haven't touched it, then yeah, you're in Single Process mode.

[keen adder]

Yeah I see it here, it even mentions it'll have more issues lol

I'll google what those issues may be

Thanks for your help man

Oh! Probably issues with statics and stuff

multi-instance loads pretty fast, so it's no biggie

[quasi tide]

To be honest - I mostly run things in SP mode just because it is faster to start up.

[keen adder]

Haven't run into any issues?

[quasi tide]

Whenever something is screwy, that's the only time I turn it off to confirm it.

Not really. Nothing outside of the ordinary to be honest.

[keen adder]

I immediately found one in multi-instance. The non-active client runs at 2fps lol

I'm sure there's a setting somewhere to disable the low fps on loss of focus, but I'll stick with SP for now, thanks broski

[kindred widget]

Not really. OnRep is just an extra function called when the variable arrives on client.

[hoary timber]

i just switch the mesh visibility to false only on the local player 🤷

[keen adder]

Hey dude, sorry to summon you again, I put my log on ReceivePossess, and now the server posesses both, but the client still has nothing

Any other thoughts on how the client can get ahold of it's pawn? It has a playercontroller, I can see, it just doesn't seem to posess it
(It's always nullptr)

[toxic grove]

https://www.reddit.com/r/unrealengine/comments/1f9ydqy/unreal_engine_6_will_improve_support_for/

Dropping this here for people.

[queen escarp]

this is called in game mode ive confirmed all players holds 2 controllers but its only fiering on 1 oif them :/ ?

[cobalt notch]

I can finally fix my game in April 2030 then. 🥳

[daring gorge]

i was going through @fathom aspen s multiplayer tips/ tricks and he mentions how cpp includes something called replication graph, custom network serialization for types, fast array replication(i understand this), virtual methods. can anyone give me an example of where id use these methods? like real life applications

[modest crater]

A custom replication graph - almost never unless you really need someting custom since unreal supports the defalt replication graph and iris

Custom Serialization - I use it all the time, you just need to specify some type traits templated on your struct type and then you can implement whatever the trait expects (DW if this doesnt make sense, you wont need to care about it until you actually start writing network code you intend to keep, not just mess around with and learn), unreal supports most serialization out of the box without much effort from you

FastArray - Sometimes, depends on if you have lots of data that changes an even needs a fast array setup, again same concept as above where it is a nice optimization but it changes nothing about the general concept of you just learning, I would ignore these until you need them.

Virtuals - nothing to do with networking at all and the entire engine relies on them (mike acton laughing at us rn). This sounds like you should do some learncpp.com

[daring gorge]

i plan to write code that i will keep, just making sure i dont miss out on things and their use case, thank you so much!

[vivid seal]

FastArrays also give per-item callbacks, which is what I use them for more often than not.

[modest crater]

I know, I use them I just already said a lot

[daring gorge]

how/what situation do you use these callbacks in?

[vivid seal]

off the top of my head, things like equipped ability slots, you can have UI elements that update for each slot individually, and when a new ability is set in a slot (a fast array item) the UI can just bind to that specific slot instead of having to figure out what in the array changed and which widget needs to update

but there's probably a lot of use cases, you can use it for initializing individual elements on the client side as they're added to the array

[fossil spoke]

The point being is that its much more convenient to use, than just replicating a regular TArray and manually parsing all elements that changed in the OnRep

Im not entirely sure what the performance differences are between regular TArray replication and FastArray replication.

[daring gorge]

so in a fast array only the element that got init or addded gets replicated and not the entire array when the change is made?

[fossil spoke]

I almost feel like the Fast Array callbacks should be native to TArray replication as well.

But I guess thats specific to networking and since TArray is a generic container, its not really appropriate in all cases.

[vivid seal]

I'm not sure how it works under the hood, but the point I was making is you get an OnRep-style function call for each individual element that changes, rather than just one that says "the array changed"

[modest crater]

Its key based is it not? You arent querying an entire shadow array every frame the actor is considered relevant, that's one of the performance benefits.

[fossil spoke]

Yeah there is likely CPU optimizations in there, given that it stores deltas

[daring gorge]

thats exactly what came to my head as you told

[fossil spoke]

How well that translates across the size of the array im not sure.

[modest crater]

wdym likely, there is. That is a massive benefit to using them, not just index callback behaviour

[fossil spoke]

Id expect it to be more performant for high counts

[fossil spoke]

Force of habit response sorry. You are right.

[daring gorge]

im just making sure what i write in my project makes more sense and is the right method, however im slowly realising that this whatever i coded 2 years ago watching a bunch of youtube is stupid and ill go over it again so why not do it properly and know whats proper

if not just know more🤷‍♂️

also lets say it being a generic shooter project i often fail to see how/where i can use concepts in my project but yeah examples help understand better!

[modest crater]

Nah I was a little dickish sorry

[fossil spoke]

Generally speaking, as you progress through a problem, you find different solutions that you weren't aware of before. These solutions are also going to be useful for other problems. As you understand a solution through its usage, you end up being able to identify its usefulness to solve other problems.

Knowing how to solve a particular problem, or at the very least, what tools (concepts, patterns, etc) you can use, becomes easier as you gain more experience.

[daring gorge]

i dont have any problems as of now however i wouldnt want any in the future either

[daring gorge]

indeed thats exactly why i wanted to like go over all the articles and write down the information im missing so i know what im doing better

[fossil spoke]

Sure, if thats how you learn best. Personally, thats not how I learn.

Typically I will come across a problem, not know the best way to approach solving it. Research the issue and come up with something I think might work. Find out what elements of that solution exist already. Learn those and apply them.

If that solution isn't efficient enough or has flaws, rinse and repeat the earlier steps.

I cant just pick up a 1000 page book on all the inner workings of C++ or networking and just absorb all that information to be able to recall the appropriate parts when faced with a problem.

Which is what I feel like you are suggesting

[daring gorge]

ive recently figured that my knowledge of networking isnt sufficiant to just keep going on my project and ive been way too long at this project to keep changing its code everytime i realise ive done something the wrong way or that theres a better way, i love practical way of learning too but i cant keep using my time on my project and keep going at it forever so i wanna clear my knowledge of the basics before i make the bigger mistakes which ofcourse i can fix with your method..

also i have recently took upon myself to write things down because it is indeed been helping me more

[daring gorge]

and yes this doesnt work either, neither for me

howver itd be good to know incase i run into a problem that hey i mightve thought of this before, mightve either written it down, if nothing it atleast reinforces the idea like "hey youve actually talked about this before and you didnt know when this could be used but now youre using it"

[viscid tapir]

Hey! I'm working on a MOBA-style game (similar to LoL, DotA) and I'm trying to implement Click-To-Move functionality. Right now, I'm using SimpleMoveToLocation for movement but it doesn't seem to work on the client at all.

Does anyone know if there’s something built-in (maybe in the CharacterMovementComponent or nav system) that could help with predicting and replicating click-to-move movements in networked games?

I'm not very familiar with the navigation system, so any pointers would be great!

[marble gazelle]

I remember that the navmesh is not present on clients per default, maybe that's the root cause of your issue

[cursive steeple]

Normally you wouldnt need to predict stuff and all pathfinding would happen on the server. Client sends the click location, server calculates the path and moves the char, client observes as their character is moving. You mentioned LoL, which actually doesnt do any prediction (for movement or abilities) (only smoothing)

[viscid tapir]

Ok thank you!

[meager spade]

We do predicted movement

You can enable navmesh on client

Then you can move on navmesh

This is how we do it in red solstice 2 do player has instant click to move.movement

[tardy fossil]

all net channels go through the netdriver right? like if i'm using the steam net driver with their relay stuff, a custom net channel should work normally right

[coral badger]

Does anyone know whether Client target builds (not just Game) can still function as Listener Clients?

[lost inlet]

The point of the client target is to get rid of listen servers

That's the difference between client and game

[wicked whale]

Hello everyone. I'm a relative beginner when it comes to Unreal Engine and most of my learning come from youtube tutorials/udemy courses. I was able to learn a lot and make excellent progress, but one topic I'm struggling a lot with is multiplayer/network. While I do understand how it works at a code level and how to use it (how to replicate properties and subobjects, net roles, net modes, relevancy, RPC calls, etc), I feel like I'm missing the basic understanding of how to design gameplay features for a multiplayer game.

Does anybody have good advice, or maybe know of a good course or youtube channel where I can learn about multiplayer - but again, not how to do it, but how to design gameplay for multiplayer? For example, while I know exactly how to write the C++ code I need to implement replication, and even custom serialization, I often struggle with basic decisions such as "should this happen on the client or in the server? or in both?" and therefore I feel like I could benefit a lot from learning more about the network mindset itself than learning how to implement specific parts of it.

[opal pulsar]

Does anyone know the CMC moves for AI?

doing something custom and I am wondering how I am going to handle sending the clients the updates of the velocity on the pawns. The only way I can think is multicast but thats dumb right? lots of AI would saturate the bandwidth

Hence asking how the CMC handles it

[modest crater]

check OnRep_ReplicatedBasedMovement

[latent heart]

Just to check, if an actor has a reference to another actor that's replicated... that reference can get replicated before the other actor right? So it might have its onrep called before that other actor gets sent?

[modest crater]

Yep, that little fun one made me re write my weapon inventory system to use structs and a single source to replicate it (the manager component) (I like it now anyway, super cheap and all data is atomic so it worked out)

But yeah, not really a way to add dependencies either without a custom replication graph afaik too

[latent heart]

My friend is just experiencing the joy of this for the first time with an inventory system 😄

[coral badger]

Yeah, that was what I thought also, but I was thinking about what would happen in practical terms if you tried that.

[lost inlet]

nothing? ?listen will just be ignored

all the server code is removed

[coral badger]

So, you just open a map in single player.

[lost inlet]

yes

[coral badger]

Aight

[charred sapphire]

Hi!

I'm trying to implement a multiplayer-compatible pause menu into my little learning project.
**Is there a delegate that clients can subscribe to, that notifies them that the GameMode has paused the game? **

I'm trying to figure out a (nice) way that clients can listen to this happening, without the GameMode having to cycle through each and every player on my end.

[keen adder]

Heya guys, When testing with 2 pawns, only the owning clients should have IsLocallyControlled() == true right?

[coral badger]

I'm attempting to connect to a server with a Game target client (not Client target) and I'm getting an error that I have not seen before:
[2024.09.06-13.00.45:451][686]LogNet: UNetConnection::SendCloseReason:
[2024.09.06-13.00.45:451][686]LogNet: - Result=MissingLevelPackage, ErrorContext="/Memory/CSSAVBJBQS041BN9UEJ4VUIOQ/Memory/CSSAVBJBQS041BN9UEJ4VUIOQ"
This is on the server.
Does this mean that there are assets on the server that are not there on the client or the other way around?

[keen adder]

Server should only have true on it's own pawn right?

[charred sapphire]

Yeah.

It can get weird in the first few ticks after BeginPlay though.

https://forums.unrealengine.com/t/is-locally-controlled-returns-false-for-listen-server-host/406471/2

[coral badger]

Someone might have more experience on this, but my hunch is that you should probably have something like that in the GameState instead? Since it syncs over network and you can always just ask its' state on your clients.

[latent heart]

I think there is a delegate.

Totally forgotten where it is, though.

[keen adder]

I found that on begin play, local/client stuff is not yet set up

So what event is supposed to be used to set everything up?

[charred sapphire]

/** Pawn has been possessed, so changing state to NAME_Playing. Start it walking and begin playing with it. */
    ENGINE_API virtual void BeginPlayingState(); ```

In PlayerController

That's what I use most of time, personally.

[keen adder]

BeginPlayingState ?

[charred sapphire]

Yeah. That's where I set up UI, assign delegates, etc.

[keen adder]

Is that even an official event from APawn?

[charred sapphire]

idk what you mean by "official event"

[keen adder]

Ah sorry lol. I'm doing this part through blueprints but it doesn't seem to be exposed, so if it's C++ only I'll have to manually expose it

[charred sapphire]

it's not exposed to blueprints by default, yea

[keen adder]

But you're saying online stuff works by the time this event is called?
Because I'm seeing all kinds of crazy stuff in begin play

[charred sapphire]

.h

    void BlueprintBeginPlayingState(); ```

.cpp

void ACPlayerController::BeginPlayingState()
{
Super::BeginPlayingState();

BlueprintBeginPlayingState();

}

[keen adder]

Like, every pawn thinks it's "LocallyControlled", PlayerController doesn't even run at all on clients, etc.

[charred sapphire]

That's what I've been using personally and it works. I've had my fair share of headaches with BeginPlay unfortunately.

It... lies... so... many...times

This one seems solid.

[keen adder]

Awesome, I'll go implement that now

[keen adder]

Haha yeah feels like it

Also searching online it seems like BeginPlayingState is empty, so Super might not even be nessecary 😮

[charred sapphire]

You are right, it's just called by ChangeState

I wouldn't remove it regardless, personally. If they decide to add functionality to it later on

[keen adder]

Yeah good call. Also, do you know if that event is on every actor or just PlayerController?

[charred sapphire]

This whole methodology does not work with Spectator type Pawns though. Be aware.

Only possessed, playing pawns

[charred sapphire]

Just PC

[keen adder]

Ah shit

Check this out, 2 pawns spawn in

Why does the server claim ownership of both lol

Just trying to get off the ground here and unreal is not doing anything it's supposed to

[keen adder]

Sorry to keep bothering you, but do you have any magic for APawns as well? Their begin play also lies

[charred sapphire]

I haven't really ran into such issues with Pawns or Characters.

I don't really have sensitive logic there. :/

[keen adder]

I see okay, I'll try your method and if it works, drive the pawns from there. Thanks man!

[lost inlet]

also what's with the "PlayerControllers don't run on clients" remark

they run on owning clients

also to make that debug output less confusing, it should at least include the name

[keen adder]

If I just put a Log(this) in the PlayerControllers BeginPlay(), I get
"Server: PlayerController"
"Server: PlayerController"
And that's it. Nothing from the client

[lost inlet]

GetNameSafe

[keen adder]

Or no sorry

Log(GetControlledPawn())
Gives

Server: Pawn
Client: nullptr```

That's what it was

[lost inlet]

yeah I don't know what your custom Log function does

[keen adder]

But I'm finding out that BeginPlay just doesn't give enough time to properly register everything

[lost inlet]

since this is just printing a class name

[keen adder]

It prints to the screen

[lost inlet]

yeah, how?

I can't see your screen

[lost inlet]

the code

[keen adder]

Also this is from BeginPlay on the Pawns

[lost inlet]

super secret Log method

[keen adder]

Bro chill lol

GEngine->AddOnScreenDebugMessage

[lost inlet]

yes, how does it convert the pointer you pass to a string

like getting blood from a stone

[keen adder]

I think you're focusing on the wrong thing here

[lament cloak]

Hey so with Iris I get this error followed by a check() failure, on the server when I try calling AddReplicatedSubObject() immediately after spawning its owner actor.

LogIrisBridge: Error: ActorReplicationBridge(1)::BeginInstantiateFromRemote Failed to find Outer [NetRefHandle (Id=596):(RepSystemId=?)]NOT_IN_CACHE for dynamic subobject

After banging my head a bit I decided to just throw a timer on it to test. If I call AddReplicatedSubObject() one second after spawning the actor, it's fine.

BeginPlay() seems to be too early.

Is there another hook sometime after BeginPlay() that it's safe to call AddReplicatedSubObject() from? I dont like setting arbitrary delays

[lost inlet]

super secret proprietary log function it is

but if it looks like Actor->GetClass()->GetName(), then yeah

that'll explain it

[keen adder]

My point is that the BeginPlay doesn't seem to properly register online functionality correctly

Nevermind my pseudo code logs trying to explain the situation

[lost inlet]

BeginPlay on a client is called when the client knows about the game state

or whenever the initial bunch about an actor is received after that

[keen adder]

Yeah, Augmentum mentioned BeginPlayingState which I'm about to try for the PC

[lost inlet]

NotifyControllerChanged on the pawn side exists on client and server and is called when posession changes

[keen adder]

Is NotifyControllerChanged the correct one to use for registering a client pawn properly?

[lost inlet]

Which on the client will either be nullptr or a valid local controller

define "registering a client pawn properly"

[keen adder]

I put in a 1 second delay and all the LocalController() stuff works well

But right on BeginPlay I get all kinds of bogus values

[lost inlet]

yes, because BeginPlay will still use whatever values in the initial bunch

the PC can also replicate AFTER the pawn

OnRep_Controller calls NotifyControllerChanged

[keen adder]

Right yeah that explains things

I tried controller changed and got like, 7 print messages from 2 players

1 sec

This is on just 2 pawns spawning in lol

[lost inlet]

well this output is pretty useless without any actual context

[keen adder]

Oh, just trying to set initial values -- bind controls, etc.

[lost inlet]

and what does the callstack look like when you add a breakpoint?

[keen adder]

I'm just doing this stuff in blueprint atm for quick turnaround speeds

[lost inlet]

not sure why you don't bind controls in SetupPlayerInputComponent though

well in BP for controls you just use IAs as an actual node

[keen adder]

Isn't that in the character class?

Atm I had PlayerController setting up the IAs on BeginPlay

I don't see where the SetupPlayerInputComponent event is

[lost inlet]

that'll be SetupInputComponent on the PC

but in BP, IAs are still nodes with exec pins on the player controller

[keen adder]

Yeah and that's the issue, Server PlayerController thinks it owns both pawns, and the Client one thinks it owns nothing lol

So I was trying to find an event for when the PC has that stuff properly initialized

Justt trying to expose BeginPlayingState now

[verbal vapor]

How do I get the character's root component of a player who actually initiated the input action?

So I can actually send to everyone whos root component the sound will be attached to?

GameState has the data, right?

Or not?

I am about to test this out

i hope that works

[lost inlet]

what am I even looking at

[keen adder]

BeginPlayingState worked like a charm!
It's properly called after the pawns are posessed & online logic is set, so I can then call LocalPlayer/LocalRole/RemoteRole/etc to figure out which client owns what.

Thank yo so much for that man! 🙂

[verbal vapor]

This kind of works for all other people

except the one who initiates it

so i guess i will play it locally for the initiator

or something

[charred sapphire]

sure, you are welcome. be aware though that it might just be a workaround to legitimate problems you have with lifecycles though

so do not use it blindly

[lost inlet]

this kinda makes no sense? the input action is already on a character BP anyway?

so the input will always come from the local player

input actions are not networked

[verbal vapor]

look

when i press 1

the sound attaches to myself

then i replicate that piece of information to all other clients

thats the goal

at least

right now it works for all other clients (the sound is coming from direction of a player who initiated it)

but for the one who initiated it, it plays on other people

xD

even though i got the player controller

so it should be local to the guy who initiated it right

so multicast will point to the guy who initiated it

and only him

[lost inlet]

I don't know why this wasn't your first thing to test if the sound is supposed to come from this/self

[verbal vapor]

i have done that already

and you know what's happening?

[lost inlet]

RPCs are called within the context of this actor they are called from

[verbal vapor]

it attaches to every character

except the one that is supposed to attach

by character i mean capsules

[lost inlet]

???

[verbal vapor]

yeah

xd

[lost inlet]

what PIE mode

play as client?

[verbal vapor]

I am using steam sessions

2 accounts

[lost inlet]

that is irrelevant for testing in editor

[verbal vapor]

i am not testing in editor

since u cant test steam in editor anyway

[lost inlet]

what a pointlessly inefficient workflow

[charred sapphire]

dude

be nicer

holy hell

[lost inlet]

since unreal networking is nothing to do with steam

[charred sapphire]

you are straight up hostile to others

[verbal vapor]

? XD

[dark parcel]

I suppose it's kinda hard to test sound tho

in PiE

normally I just print string

[lost inlet]

it's hard to do it even in packaged

[modest crater]

https://tenor.com/view/dancing-duck-dance-duck-duck-ooontz-dance-gif-10943740227711557279

[lost inlet]

unless the world enhanced input subsystem is enabled, then it's very unlikely that you're going to be triggering input for anyone but yourself. but that shouldn't apply to pawns (which includes characters)

the multicast here will also be called in context of the actor, not just for every pawn in the scene

this is why testing in PIE will actually come in handy, you can add breakpoints

[verbal vapor]

I will literally make it 10th time and tell you what's going on

[lost inlet]

well yeah, the timeline here is input key released -> send RPC (nothing happens on client) -> server calls multicast -> the server and each client spawns the sound

[verbal vapor]

Yeah

that's correct

I have tested multicasting player location for example and it works fine

But I cannot multicast the root component of a character

[lost inlet]

well you wouldn't need to anyway

[verbal vapor]

And I am doing yoga trying to retrieve that

[lost inlet]

the client already knows what the root component is

[verbal vapor]

Yeah I wouldn't need but I do since the bp ^ is not working

[lost inlet]

which in a character should be the capsule component

[verbal vapor]

i know it makes sense right

but it doesnt work

[lost inlet]

so what's the testing setup here? 2 clients connected to the server dedicated server?

or one of them is a listen server?

[verbal vapor]

one of them is a listen server

but with this setup it's not supposed to be an issue

since listen server is a server and a client

this flow should work correctly

[lost inlet]

the only difference is a listen server won't use networking for server calls

since it is the server

is there any difference in behaviour regardless of who performs the action?

uh, regarding

[verbal vapor]

This stuff attaches sound to everyone else except the one who initiated it

¯_(ツ)_/¯

[lost inlet]

so if the 1st client performs the action, the 2nd client will see (or hear it) as intended? and vice versa?

[verbal vapor]

When client A initiates the input action, the client B and rest of the clients, will have attached sound on their pawn (and they can hear it)

This stuff is mostly working.

This works for every client as supposed

Except the caller.

[lost inlet]

wait, so the intention is for every client to hear it coming from themselves?

[verbal vapor]

No

XD

WHEN I PRESS 1

I WILL HEAR IT

AND I WANT EVERY OTHER CLIENT TO HEAR IT BUT FROM ME

AND ONLY ME

but the root component as you previously suggested doesnt work as supposed

[lost inlet]

that's what the original thing you showed should do though? the thing you said was "mostly working" will make it come from the local player's pawn

[verbal vapor]

yes

as i said it's mostly working

but when i fire this up

the local player hear it from other player

not from himself

XD

this is fucked up i promise

[lost inlet]

"not from himself" means that it doesn't play at all or that it plays from the wrong source?

[verbal vapor]

Client A initiates sound
Client B, C and the rest hear it from the right source (client A)
But Client A hears it from Client B

[magic vessel]

Is Client B the listen server?

[verbal vapor]

Hold on

[magic vessel]

Or rather, which client is hosting?

[lost inlet]

It didn't sound like there was much difference. But I suppose there is a test you can do, from the input action, you can have a Has Authority branch, and just call the multicast if authority

but I'm pretty sure a listen server host will just call server RPCs locally without networking

[verbal vapor]

i mean, as i said before, when i was using get actor location for example, it successfully multicasted it

from A to B

B to A

no problem

let me package it really quick

Okay so

A is a client and when he's pressing 1 the sound attaches to B, so it's wrong here

But B hears it from A so it's correct

And B is the host

[magic vessel]

Okay, then it's somehow not receiving the multicast?

[verbal vapor]

It's receiving it

For sure

But somehow the component is wrong

How? I dont know

[lost inlet]

well it has to receive it because the sound is from the multicast only

[verbal vapor]

yes

[lost inlet]

I'm not sure how likely it is the root component is wrong, you would have greater problems than this sound if this was the case

like movement being broken

but you could even debug print the location of the component if you want to check that

I'd throw the display name of the pawn into that debug print though

[verbal vapor]

So here is the thing...
Client A attaches it to itself but client A hears it from other clients not himself, while the rest of the clients hears it from the right source
Client B attaches it to itself but client B hear it from other clients not himself, while the rest of the clients hears it from the right source

[magic vessel]

Is this code running on the player controller or pawn? Or somewhere else?

[lost inlet]

I assumed the pawn because of the target in the nodes

[verbal vapor]

Character

[lost inlet]

a character is a pawn for ref

[verbal vapor]

yeah u can call it that way

since it's based on pawn

and pawn is an actor

[lost inlet]

though I am a little curious about your input mapping implementation here. the listen server host will have a valid controller for all players in the session, so I was wondering if anything else was happening in addition to the adding of that IMC

[magic vessel]

Currently loading up my project to see if I can figure this out

Seems to work fine

Add in a draw debug box, to visualise which component is being used

Might be the enhanced input as sswires mentioned

[lost inlet]

It's a bit of an odd place to enable an IMC in BeginPlay, since there's even a chance the controller isn't set on the client yet. But if you've somehow enabled input on all pawns as the host, then I can imagine that causing some weirdness

Enabling an IMC on its own isn't going to do that, and a localplayer doesn't exist for remote players anyway

[verbal vapor]

So this works fine to you? xD

[magic vessel]

But the IMC mapping is marked as cosmetic only? So the host wouldn't be able to do anything anyway

[magic vessel]

As far as I can tell

[verbal vapor]

Yeah I have the IMC setup from the template third person gamemode

[lost inlet]

Well it needs this, which is a local player subsystem. no local player for remote players

Here I was wondering what was hiding above in the Then 1

[lost inlet]

the "Then 1"

it's out of the frame in the screenshot

[magic vessel]

I'd highly recommend adding in the debug box, see if it doing what you're assuming it is

[verbal vapor]

alright

[magic vessel]

Maybe that needs to be local only?

[lost inlet]

hmmm I would remove anything to "fix" audio to rule it out

[verbal vapor]

i can test it out without it

[lost inlet]

though it's just attenuation so I doubt it affects panning

unless you have something else for that

[verbal vapor]

i meaaaan

the thing is

it's nothing wrong with panning or attenuation

since the source is for sure at different pawn

[lost inlet]

well add the suggested debugging

so you can at least visualise the problem

[magic vessel]

Looking at that, why are the rotation values going into a location override?

Haven't used that function before, so might be a red herring

[lost inlet]

yeah get the debug box in there and maybe a print string so you know which actor the multicast came from

like everything in that screenshot looks good to me

it is pretty simple afterall

[verbal vapor]

hold on

let's run it then

[magic vessel]

I'd increase the thickness and duration

[lost inlet]

well you'll need to connect the exec

and probably an easier to see line colour than black

[verbal vapor]

packaging, uno momento

u said my workflow is shit, 2 days ago i was packaging, uploading (for 15 minutes at least each build) and asking friends to come test steam sessions

💀

now what i have this is supreme workflow to me

fuuuuck

it was because of the sequence thing

https://tenor.com/view/blank-stare-homelander-antony-starr-the-boys-dead-inside-gif-25853869

[magic vessel]

this?

[verbal vapor]

this works correctly now

[verbal vapor]

yes

[magic vessel]

xD

All been there

Hours of debugging for a simple fix

[verbal vapor]

simple fix -> getting rid of a feature that broke everything

thanks for help

So I have plugged in the sequence 1

And it's spawning the sound where it is supposed to be

But the sound comes from the other character

[magic vessel]

If I had to guess I'd say it's the GetPlayerController that is doing that

I'd add in a IsLocallyControlled branch before

[verbal vapor]

right

[magic vessel]

I need to go now for a few hours, if that doesn't work then I'll have a look when I get back 🙂

[verbal vapor]

thanks

or maybe i will just delete the player controller

and it's gonna end up as ref to 'self'

ah no nvm

it doesnt work like that :-D

yeah well it doesnt work :-D

[dark parcel]

use is locally controlled node

[verbal vapor]

i will test this out xD

[lost inlet]

I think the original train of thought was probably more appropriate

but if the possessing player controller is local

rather than GetPlayerController(0)

[verbal vapor]

yeah this works fine

🫡

is it?

hold on XD

the attenuation override doesnt work now

like the whole fix

ah gotcha

so it's still broken

xD

so let's test this one out then

nah this one brings the old problem back

oh maybe i am retarded

am i supposed to use local player controller?

yeah well i am not retarded then

🫡

[dark parcel]

stop using get player controller with index?

[lost inlet]

uh

GetControlledPawn

just replace with GetController

check if it's a local controller

[dark parcel]

can't you just use is locally controlled right away

it's in player controller

[lost inlet]

oh yeah, so imagine that with one more red squiggled node

though BeginPlay checking the controller can be sketchy. there's no guarantee it'll be reliably set by this point

ReceiveControllerChanged in BP is more reliable

[verbal vapor]

i dont have such thing

as get controlled pawn

https://tenor.com/view/disappointed-confused-unsure-what-okay-gif-5560912481940641308

[lost inlet]

I guess I'll have to show it in MS Paint again despite saying this

[verbal vapor]

my friend

[lost inlet]

cast it to player controller then?

[verbal vapor]

XD

yeah u see i have used this before

[lost inlet]

.

[verbal vapor]

ok my friend

[lost inlet]

player controller is a child class of controller

AI controllers also exist

[verbal vapor]

XD

[verbal vapor]

yes

[lost inlet]

well I've tried to be patient enough

though I doubt you're intentionally being obtuse

[verbal vapor]

is that intelligent way of saying i am stupid

[lost inlet]

SetAudioListenerAttenuationOverride is a player controller function

so you need to give that the cast result as the target

IsLocallyControlled is a pawn function, so "self" is sufficient here

[hoary spear]

Try to always work in context when you can, when using references

Especially for less experienced people it helps a lot

[dark parcel]

if you don't know how to use references maybe steer away from multiplayer

[verbal vapor]

X D

keep yapping

if u dont know how to ride a bicycle, dont ride it

fam acting like sitting on a problem for couple of hours will make you better each minute

[keen adder]

Hey so, seems like a common problem:

When I run my game, the Server can't see the clients movements, what's the issue?

Looks like it works fine in the content examples without any additional changes

Is there a checkbox somewhere I need to click to make the clients movements authoritative?

[verbal vapor]

If you're using default template i.e (third person), it's replicating client character movement by default.

And that's what's supposed to be enabled by default.

[keen adder]

Oh no I'm using Pawns, not characters

But the Client can see all movements, however the Server only sees itsef move, it doesn't see the client move

I wonder if there's something I'm missing, or if both working is some behavior built into the Character class that I don't have with Pawn

[lost inlet]

CMC assumes character too

so I guess you're rolling your own movement?

[verbal vapor]

@lost inlet yes this fix the issue

[lost inlet]

the first two nodes on the left are pretty superfluous

"target is pawn", you're already a pawn

though the first node not entirely, that has to feed into the cast only

just unnecessary for IsLocallyControlled

[dark parcel]

CMC has about 10k lines of codes, with network movement being one of the component

[charred sapphire]

Dumb question:

Should calling, a GetGameState from the Client during PostInitComponents result in a nullptr exception? I thought it was a safe call.

Works perfectly fine on the ListenServer, but DelegateAccessHandler starts screaming at me during runtime on the Client.

I mainly wanna start listening to a delegate at this point. 🧐

Here is the piece of code, nothing special:
(I know the variable is useless for the time being but it helps me debug this)

void ACPlayerController::PostInitializeComponents()
{
    Super::PostInitializeComponents();

    LogOnScreen(GetWorld(), FString::Printf(TEXT("Starting to listen to delegate.")));
    ACGameStateBase* GameState = Cast<ACGameStateBase>(GetWorld()->GetGameState());
    GameState->OnGamePauseStateChanged.AddDynamic(this, &ACPlayerController::OnGamePauseStateChanged);
}

[fossil merlin]

[Q] Anyone have experience with replicated AnimNotifies? When I test my game in PIE, everything fires as it should, but in Standalone Game (as client) or in built game (with dedicated server) they rarely seem to fire. Any ideas what would cause this behavior? I've tested it with a simple Print String node to validate and they are indeed just failing to fire consistently. Currently running 5.4.2

[lost inlet]

The only reliable place you'll get a game state on a client is in BeginPlay

[verbal vapor]

@lost inlet my man

[dark parcel]

that's pretty odd to "replicate" anim notify

like what to replicate?

[verbal vapor]

this just works too

[dark parcel]

the animation will play on both machines

[verbal vapor]

[lost inlet]

While it's a lot simpler, it can be problematic on listen server if you don't check if it's locally controlled

[charred sapphire]

Thank you!

[keen adder]

Oh yeah, I get that CMC has prediction and all that.

Just wondering if not using CMC is the reason my client is not replicated on the server at all, or if there's something else missing

[verbal vapor]

problematic meaning?

[fossil merlin]

I have some logic that fires during my reload animations, but the main issue is them not firing at all on the server. No replication code added just Notify -> Print String it doesn't show that it's firing on the server log.

[lost inlet]

it's likely to be a problem

[dark parcel]

this is a pure guess but I don't think pawn have inbuilt network movement by default?

[keen adder]

I thought so too, but the server replicates perfectly onto the client

So.. 🤷‍♂️

[dark parcel]

well does the server play the reload animation?

[verbal vapor]

yeah xD but if it works for this now, i dont think anything will break it later

[dark parcel]

the anim notify will be called in respect of each machine

[fossil merlin]

Yes - without issue.

[dark parcel]

but which one you want to use is up to your design

show code / anims

[lost inlet]

I would mostly expect that to work anyway since a server doesn't have to bother with the particulars about sending movement inputs to a server

It is the server

CMC does that and prediction

[sharp hamlet]

hello, what seems to be wrong in this? this is a code to get the number of connected clients.

[keen adder]

Aight, makes sense. I'll prob suck it up and buy a plugin anyway, I hear CMC on it's own is a disaster once lag/packet loss is factored in

[lost inlet]

Not really, CMC is pretty well battletested

It's just annoying to modify

[dark parcel]

what's the point of this code? You are setting number of players in server, wait 1 second and repeat it endlessly?

[lost inlet]

Well for one, widgets don't replicate

[dark parcel]

to get the number of joining players you can use Game Mode Post Login

[sharp hamlet]

the repeat is there for players joining late

[dark parcel]

I don't understand, what logic you are trying to do for late joiners

wait 1 second repeat endlessly = addresses late joiners?

Use Game Mode post login to track incoming player

[lost inlet]

one small detail here

[dark parcel]

but yea like sswires also says, widget don't replicate

don't bother calling RPC there

[lost inlet]

if you need to replicate state about the game, well there's an appropriately named concept of a game state actor

[sharp hamlet]

no, my POV was to check the no. of connected players every 1s. so ig i have to get the data from Gamemode only? a bit confused

[lost inlet]

though I think this already tracks the number of players anyway

since there's an array of player states within it

clients also don't know about any player controllers except their own

[sharp hamlet]

if this is sarcasm, pls unconfuse me

[lost inlet]

it is not sarcasm

[dark parcel]

#multiplayer message

[lost inlet]

widgets are not replicated

[sharp hamlet]

so get data from GM instead of the RPC?

[dark parcel]

for easy mode, just get the player array and update that on tick

[lost inlet]

game modes do not replicate

they only exist on the server

[verbal vapor]

so if i ever have to use ref to player controller i am supposed to do this instead of get local player controller? or whatever that was

[lost inlet]

yes within the context of a pawn

[verbal vapor]

so what is this get local player controller for

to troll people?

[lost inlet]

no

[sharp hamlet]

thanks sswires and coldsummers, trying it

[lost inlet]

but it's kinda discouraged for multiplayer stuff since most of the time it's not doing the thing you think you mean by it

[verbal vapor]

https://tenor.com/view/thumbs-up-nice-well-done-approve-good-job-gif-16918063

thanks

[lost inlet]

GetPlayerController(0) will just mean the first player controller, and on a client, this will just be the local controller

even more complicated if you want split screen, since then there are 2 player controllers locally

[sharp hamlet]

hey, so its completely futile to use the "get num player controllers" in WBP?

[lost inlet]

yes since on a client that'll be returning 1 most of the time

[dark parcel]

is that even a real node? 0o

i mean if it come with stock ue

never seen it

[lost inlet]

assuming it is but I don't know

but safe to assume it's just counting controllers, which will be 1 unless you have splitscreen

[dark parcel]

For easy mode ,

On Tick -> Get Game State -> Get Player array -> Get Length

[charred sapphire]

Sorry to chime in again, but at the risk of looking like a fool, I'd like some help with this: https://gist.github.com/rolandsarosy/69165a64594643490b5b2c862bfc5ee8

This is a GameState child, that I made for the following reason: **I wanted to create a multiplayer-compatible game paused/resumed delegate to show and hide a "pause menu" widget. **

The ListenServer and Clients can all attempt to pause the game (PlayerController has a Server method that calls the GM's SetPause/ClearPause functions) and unpause the game (from either the Widget or by keybind).

I can go into more detail on how these bits work (I can even push the git commit if that helps) but that's not my main issue.

I've been battling with replication for the past few months pretty extensively, but in this case, I just don't know why the OnRep does not get called for the Client always. It's weird, I think everything is in place though, but as the video too shows, the game pauses (handled by the GM) but the OnRep() function only gets called on the server.

Shouldn't it get called on the client too? I just really don't know at this point where I'm fucking up.

According to my little whiteboard here, the GameState exists everywhere too...

[dark parcel]

Game states exist in every machine but its not owned by clients, so calling server RPC there as client will not do anything, incase you are doing that

[charred sapphire]

I don't think I am?

[dark parcel]

well I wouldn't know

anyway I heard from reputable person here, pausing in mp kinda a shit show

maybe consider changing global time dialation to very small number

instead pausing the game compeltly

[charred sapphire]

bool ACGameModeBase::SetPause(APlayerController* PC, FCanUnpause CanUnpauseDelegate)
{
    const bool bCouldPause = Super::SetPause(PC, CanUnpauseDelegate);

    ACGameStateBase* GameStateBase = Cast<ACGameStateBase>(GameState);
    GameStateBase->ChangeGamePausedState(bCouldPause);

    if (!bCouldPause) UE_LOG(LogTemp, Error, TEXT("GameMode was unable to pause the game."))
    
    return bCouldPause;
    
}

I'm overriding the GameMode's SetPause (and CLearPause) function too, that calls the GameState's ChangeGamePausedState, which changes the variable, which should launch the OnRep everywhere.

It's all running on the server too, since only the GM starts this whole ordeal

[dark parcel]

what is being OnRep? curious

[charred sapphire]

uuuh, it's in the GitHub gist, lemme copy it here too

void ACGameStateBase::ChangeGamePausedState(const bool bShouldBePaused)
{ 
    if (!ensure(HasAuthority())) return; // Should only be called by the server.
    
    bIsGamePaused = bShouldBePaused;
    OnRep_IsGamePaused(); // OnRep_Foo() functions don't trigger automatically on the server. Clients will ignore the double call of the function as they already have the correct state set.
}

void ACGameStateBase::OnRep_IsGamePaused() const
{
    LogOnScreen(GetWorld(), FString::Printf(TEXT("OnRep for IsGamePaused triggered.")));
    OnGamePauseStateChanged.Broadcast(bIsGamePaused);
}

but again, the Gist has both .h and .cpp files there so it's easier to understand

[dark parcel]

is this Tom Looman tutorial? have you try asking in his discord?

[charred sapphire]

he has absolutely no discord for his course

this is not strictly related to that though

i've been making it better and improving, refactoring stuff for a while

[dark parcel]

I have no idea sorry, if bIsGamePaused is marked as repnotify I do reckon OnRep should be called

[charred sapphire]

yeah, i do reckon too, i'm going crazy

i appreciate your help though, really

[dark parcel]

don't lose hope if exi is around you can probably ask him

most of the wise elders are not around atm

[charred sapphire]

funniest thing is, in like... 1 out of every 30 "pausings", it works

that's what's most puzzling to me

[latent heart]

Server should really be in the middle. It would be a lot clearer.

[charred sapphire]

lmao, yeah, it probably would be

it's been there for the past 4 months, so i'm pretty sure it soaked right into the whiteboard though

i can recite that thing in my dreams too

[latent heart]

You can remove stuck on marker by writing over it with erasable marker.

(or actual cleaning fluid)

You can remove non-erasable marker the same way.

[charred sapphire]

yeah yeah yeah, i'm just joking

[hoary spear]

sounds like this should just work really

[charred sapphire]

yes 😦

[hoary spear]

testing locally ?

[charred sapphire]

DebugGame, and:

[hoary spear]

single process ?

[charred sapphire]

uuuh, i'm sorry i'm not quite sure what you mean by that 😦

could you elaborate please?

[hoary spear]

Advanced Settings-> Run as single process should be toggleable

Run under One Process

[charred sapphire]

thanks! lemme check

Yes, it is toggled.

Lemme check it untoggled.

oh i see what it does now, that's kinda cool

nop, same behaviour 😦

i didn't work like... 7 times, worked the 8th and does not work once more

i'd be more convinced of my own failings if it didn't work... ever

but the fact that sometimes it does, is what makes this really weird

might just try a multicast instead of working with OnReps

[hoary spear]

testing it here, it acts strange atm

[charred sapphire]

Oh you could reproduce the issue?

I really appreciate the help you put into this.

[hoary spear]

works fine here

[charred sapphire]

Crap.

[hoary spear]

just for testing GS got this

replication settings

basically same functions as you got , setting the bool from the function input , replifetime for the bool, using OnRep function, calling OnRep on server aswell

[charred sapphire]

That does look similar to my solution. All this above is in GS?

[hoary spear]

yeah

I just skipped all the checks etc

[charred sapphire]

yeah, reasonable

[hoary spear]

void AMyGameState::SetGamePaused(bool bShouldBePaused)
{
    bGameIsPaused = bShouldBePaused;
    OnRep_GameIsPaused();
}

[charred sapphire]

Lemme see if the GS BP settings match.

Yeah those seem like all the default settings, which is what I have on my end too.

[charred sapphire]

Net Priority was 1.0 on my end and 10.0 on yours, but that made no difference.

May I ask, what engine version are you using in this example?

[keen adder]

So, odd question: NetMulticast sends an RPC to server + all clients right?

[latent heart]

No

[keen adder]

UFUNCTION(NetMulticast)
void MulticastFunction(){
    DisplayMsg("MulticastFunction");
}```
Meaning when calling this function, I should see "MulticastFunction" displayed for all clients

[latent heart]

NetMulticast can only run on the server and it sends it to all other clients.

(other clients in the case of a listen server where the server is also a "client")

You can only send single-target server rpcs from a client.

If you try to net multicast from a client, it will just execute locally.

[keen adder]

Right, Client -> Server -> Multicast

But, when I call multicast from the server, I get this

Shouldn't it also display "Client: MulticastFunction"

Oh shit no, I'm actually calling it from the server's client

That is, the host's machine. Not the server

Man is there any way to show a warning form calling that from a client?

[latent heart]

if (GetWorld()->GetNetMode() == NM_Client) { UE_LOG(LogTemp, Error, TEXT("CLIENT MULTICAST!"); }

[keen adder]

Where would that be put though, in the multicast function?

Or the function calling it?

[latent heart]

In the caller, I guess.

Because the implementation is expected to be on the client.

[keen adder]

Ah, yeah im just worried about when I forget to check for client, and then wonder why it doesn't work lol

But hey, I've got some other unexpected behavior

UFUNCTION(Server)
void Multicast_Server(){
    Multicast_Clients();
}
UFUNCTION(NetMulticast)
void Multicast_Clients(){
    Print("MulticastFunction");
}```

Looks good right? Call server -> Multicast

This works well on the client (Prints the msg on Server+Client)

but the listenserver only executes it locally (Prints on Server only)

Any idea what I'm doing wrong here?

[keen adder]

Heya, really sorry to summon ya back if you don't mind 1 last piece of help
Calling a UFUNCTION(Server) on the server client seems to call it on it's client and not the actual server, so it just runs locally. You know the right way to call this?

[latent heart]

A cllient doesn't mean "another computer"

It means "not hosting the game"

UFUNCTION(Server) will execute locally on a server and will be sent to the server from a client - if called on a client-owner actor.

[keen adder]

I assumed the listen server has both the server and client as 2 separate entities on 1 machine?

[latent heart]

No

They are the same entity.

[keen adder]

So the host still needs to call to the server before a multicast

Ah, so why does the host fail the multicast?

[latent heart]

Do you ahve any other clients?

[keen adder]

Either calling the multicast directly, or from server first. It only runs on itself

[latent heart]

Multicast isn't sent to itself on a listen server.

(I think)

[keen adder]

Yup!

This is from Client -> (Server -> Multicast)

[river shore]

Hello guys!
So I am having this problem when I am trying to do an Interaction system. I am calling an interface in an Actor Component attached to the character and then exit the event on a door. Inside the door, I want to call an event to the server (RPC) but for some weird reason it wouldn´t exc on the server

void ABaseDoor::OnInteract(UObject* HitObject, UPrimitiveComponent* HitComponent, APlayerController* PlayerController)
{
    if(PlayerController->IsLocalController())
    {
        if (GetOwner() != PlayerController)
        {
            SetOwner(PlayerController);
        }
        //Set bIsOpen depending on Client or Server
        if(HasAuthority())
        {
            bIsOpen = !bIsOpen;
            OpenDoor();
        }
        else
        {
            bIsOpen = !bIsOpen;
            OpenDoor();
            Server_SetIsOpen();
        }
    }
}

_________________________________________________
h.
    UFUNCTION(Reliable, Server, WithValidation)
    void Server_SetIsOpen();
    void Server_SetIsOpen_Implementation();
    bool Server_SetIsOpen_Validate();

Any Ideas?

[keen adder]

And this is from the Server -> (Multicast) or Server ->(Server->Multicast)

[latent heart]

You can only call Server RPCs on actors owned by the client.

Player State, Player Controller, Pawn usually.

[keen adder]

Can't get the server to properly multicast to any other clients

[latent heart]

The usual solution to this is to have an "Interact" function on the player controller which you call and pass the door as a parameter.

Then on the server you forward that event back to the door.

[river shore]

So you mean calling the interface on the client and then on the server again and checking for authority etc.?

[latent heart]

Show all the actual code you're using?

[latent heart]

Something like that.

[river shore]

Alr thx you soo much! have a nice one!

[keen adder]

UFUNCTION(Server)
void Multicast_Server(){
    Multicast_Clients();
}
UFUNCTION(NetMulticast)
void Multicast_Clients(){
    Print("MulticastFunction");
}```
Just this. Calling Multicast_Server on the client works, but calling either on the Server runs locally only

[latent heart]

So you don't have any _Implementation functions?

[keen adder]

Oh no, this is angelscript -- all that is automatically baked in lol

However it works perfectly from the Client side

[latent heart]

Then go ask the angelscript guys why it doesn't work 🙂

[keen adder]

so it can't be anything like that

[keen adder]

lol, so you're saying normally the server should be able to call NetMulticast?

and it will properly RPC to all clients? Nothing needed in between?

[latent heart]

The server is the only one that can NetMulticast.

(correctly)

[keen adder]

So there's some strange behavior that sort of interferes with that logic

    UFUNCTION(Server)
    void Multicast_Server(){
        Print(GetLocalPlayer());
        Multicast_Clients();
    }
    UFUNCTION(NetMulticast)
    void Multicast_Clients(){
        RepPrint("MulticastFunction");
    }

If I stick GetLocalPlayer in the server function

It should print the servers localplayer, no matter where it's called right?

[latent heart]

Correct

[keen adder]

But calling it from the client shows nullptr

[latent heart]

Go ask the angelscript guys why it doesn't work.

[keen adder]

But from the server shows it's localplayer, and it does not multicast lol

lol alright

[latent heart]

This would work perfectly in straight c++.

Or even BP.

[keen adder]

Oh man, that's a good point. I'll try in both to compare!

They created "It Takes Two" in angelscript, which has perfect online so I figured it should work correctly

but you're right none of that really makes sense

[latent heart]

You may have incorrect specifiers.

[keen adder]

Maybe, yeah. anyway thanks man! I'll try out BP to double check 🙂

[hoary spear]

5.4.4

[charred sapphire]

Thanks. I've observed that it works properly before the Client's Controller has gained Posession of the Pawn, but does not work after. I'll see what I can do with this information.

[keen adder]

FYI I just tried in BP and it behaved exactly the same, so has to be something missing. I'll just watch some youtubes, thanks again though!

[latent heart]

What are you calling these methods on ?

Your local PlayerController?

[keen adder]

Yup!

Just an empty project to get all the RPC functionality going

[latent heart]

That may be the issue.

The player controller isn't replicated to all clients, only the owning client.

So running a multicast on a PC will only notify the owning client.

[keen adder]

Oh, shit

Yeah that checks out, because the client PC IS on the server, but not the reverse

[latent heart]

👍

[keen adder]

I'll move it to the Pawn class real quick

Bruh

[keen adder]

you is a genius

[latent heart]

Wizard*

[keen adder]

Thankyou very much lol

Yes* Me right now:

[latent heart]

https://tenor.com/view/pondering-pondering-my-orb-my-orb-orb-pondering-my-pondering-my-orb-orb-gif-24060364

[charred sapphire]

@hoary spear , @dark parcel

Thank you for all the help. In the end, I could not figure out why OnReps did not work most of the time, it's one of my most puzzling issues since starting to work with multiplayer. Probably was something inside some internal function which decided when to call OnRep() or not, I truly don't know.

In the end, I gave up because I suck, and wrote a simple multicast RPC, since most of this logic could only ever be called from the server anyways. This means I don't have a variable "holding" the flag whether the game is paused or not, only a transient event shows this to Players currently on.

I guess this could be an issue in cases where someone joins late and the game is paused at that moment, since OnReps get called immediately and this is just a transient event.

(This is not a real game just a study project so, whatever.)

This is my end result, and I really, truly appreciate all your help.

[vapid gazelle]

Hey gang, could use a little help. Is it normal for the server to not be sending updates to the clients about the server player's position unless the server player is actively doing something, such as running around or rotating the character?

Problem: have a character ability to hold themselves floating in mid-air (sets velocity to 0 on the component movement, and sets the gravity to 0) and I notice that as long as the server player using this ability keeps moving their mouse, the client sees them floating in mid-air exactly where you would expect, but the instant the server player stops doing anything, the client sees the server player fall down to the ground, effectively predicting it having normal gravity.

It looks like gravity scale isn't replicated server->client, which I suppose makes sense by looking at the implementation which has no replication declared:

/** Custom gravity scale. Gravity is multiplied by this amount for the character. */
UPROPERTY(Category="Character Movement (General Settings)", EditAnywhere, BlueprintReadWrite)
float GravityScale;

However my understanding is that the character movement component is also somewhat special, and doesn't quite use the same replication pathways that I'm used to?

I'm trying to grok if I should manually replicate GravityScale to clients, or if this is the wrong paradigm and I should re-think how I'm doing this altogether? I might be going against how this was meant to be implemented and replicated

[nova wasp]

It's not very fancy on sim proxies

They get replicated position+velocity along with crouching/movement mode and then simulate some parts of it locally

[latent heart]

It's prbably not replicating the gravity change.

[vapid gazelle]

Is it normal for the server to not replicate the position / rotation of the server player to clients if there has been no input to indicate it would have changed? It seems like it's trying to optimize not sending that information over the network if it thinks there's nothing to report.

[nova wasp]

Yes, why would they send things when nothing changes?

The issue is your simulation is doing different things on each side

[vapid gazelle]

Fair enough.

[nova wasp]

A movement mode could help here I suppose

[latent heart]

Or jsut a replicated state change. OnRep -> set gravity based on state.

[nova wasp]

Yeah, that's probably easier

[burnt coral]

Lets say a player leaves the online session and has 500 cash, 100 health, and etc etc.. And I want to save their information so its the same when they load back in.. Same for the location.. Would this get stored in the PlayerState?

Or where would I save player data at?

[latent heart]

The player state will be lost after a while.

[magic vessel]

Could use the Player Save Subsystem from EOS?

Save it from the server details (never trust the client with this info) and then you should be able to load it back in without the client being able to manipulate it

[burnt coral]

So where should I put it?

[latent heart]

Game instance?

The trick is then getting the right player id from the reconnecting player.

Using their steam or eos id is a good bet.

[shadow aurora]

So I've got this ability that is intended to deal damage to enemies when they've traveled a certain distance. I'm currently tracking that using OnCharacterMovementUpdated, but it's causing some major issues. For some reason the total distance traveled that I'm tracking is vastly different between uses despite using 2D vector distances and knowing that I am absolutely traveling the same distance each time.

Anyone know if there's anything I can do to get an actually consistent and real distance to track? I'm imagining this has something to do with client/server corrections during movement?

[hoary spear]

isnt that sub-sampling?

[magic vessel]

Are you tracking it purely on server/client or on both?

[shadow aurora]

Purely on server

[keen adder]

Is it possible for a client to replicate it's variable to the server?

I've got a var with OnRep, Server->Client works, but Client->Server does not trigger at all

[lost inlet]

You send an RPC

[keen adder]

Right, so OnRep variables are Server->Client only?

[kindred widget]

Replication in general is server to client only.

[keen adder]

Ah, so to properly use OnRep vars Id have to do

Client RPC to Server, then Server OnRep Var?

[kindred widget]

You ServerRPC to the server. First word defines the machine the RPC is being sent to. But generally yes.

[keen adder]

So I'm doing that, but the server does not get it's own OnRep right?

[kindred widget]

Not in C++.

[keen adder]

I'm RPCing the server, it's Sending OnRep back to all clients except itself lol

So the server needs to run the same code in the OnRep?

Since it doesn't OnRep itself

[lusty kelp]

what about unity mutiplayer tho, i got it all figure out!!!

all you guys saying are false

not to be mean

[kindred widget]

Ehh?

[lusty kelp]

just saying that unity have a backend where as unreal u got to do extra work

what most people are here giving people wrong advice while keeping what they learn to themselves

[kindred widget]

Kind of wild accusations. I'm not sure what you think people are keeping to themselves. There are dozens of forums and many more blogs that have networking guides and techniques to things.

[lusty kelp]

bro bro not to chip nobody ears off but unity and unreal i learnt but switch over tto unity and vila

i had a mutiplayer in like an hour

[kindred widget]

I'm happy for you and your Unity. You can have multiplayer in Unreal in about.. well, no time at all. You literally install it and run a map in PIE as listenserver with 2 players.

[lusty kelp]

LOL

its more complex then that

[kindred widget]

Oh, were there extra conditions? You didn't really specify. You simply said "i had a mutiplayer in like an hour". Two characters running around and seeing each other move is multiplayer.

[lusty kelp]

yes but hole punching u got to do in order for people to connect across the globe

or atleast do port forward

some altho take port forward away

so the only option is to rent or create or hole punch

[kindred widget]

You have to manage that yourself in Unity? That sucks. I'm sorry for you. Unreal's online subsystems do that for you mostly.

[lusty kelp]

no i got a mutiplayer up

[lament flax]

how much performance does it take to serialized all data for a struct suign NetSerialize ?

[lusty kelp]

enough to screw in a lightbuilb lol

[lament flax]

you have MP in UE in 5minutes with no plugins

[lusty kelp]

no i do unity ty

[kindred widget]

He's a troll. Don't take him too seriously. I'm just bored.

[lusty kelp]

and who calling a troll boy

[lament flax]

if you like Unity so much why bothering UE here

[lusty kelp]

um freedom of speech

[kindred widget]

Freedom of speech protects you from being put in a firing line for saying that your governmental leaders suck. It doesn't actually allow you to say anything you like, anywhere you want.

[lament flax]

reminds me people insulting people then saying "where is my freedom of speech"

[lusty kelp]

how many voices are in ur head

[lament flax]

yours, and its enough for a headache

[kindred widget]

Back to sanity though. This depends on the struct. More data, more cost.

[vapid gazelle]

Just to make sure I understand this correctly, are you suggesting creating an additional variable with replication enabled, and using the variable's replication to set gravity? Or is there a way to replicate that specific component property?

[lusty kelp]

talking about this my Gs

[lament flax]

i guess with my ints, softptr and GT im fine for now 😅

[lusty kelp]

its a unity mp

[lament flax]

and ?

[lusty kelp]

and what

[kindred widget]

Probably. As always, if you hit issues, profile. 🤷‍♂️

[lament flax]

why do you show us this

[lament flax]

i hate profiling, to much data to read

but this will come with time

[lusty kelp]

i show you that to show you proof

[lament flax]

proof of what

[latent heart]

Yes

[dusty quartz]

Hey, I'm creating a multiplayer card game and I have created a state machine component on the game state to mange state changes (mostly phases of the game). I have a function I'm calling on the component where a state changes called "on begin state". On my base match state UObject bp, I want to call an event on all connected clients to play a widget animation (To show the new phase name). What is the best way to replicate this change to all clients ? Basically my question is, how can I replicate an event from the game state to all connected clients ? I tried using a multicast but for some reason the animation only plays on the server and not on the client.

[lament flax]

i get an issue where if i run the commented line, the PostReplicatedChange event wont be called on client, even tho the Amount changed aswell as the Item ptr

void USLBaseInventoryComponent::Internal_SetAmount(FSLFastInventorySlot& Slot, int32 Amount)
{
    Slot.SetAmount(Amount);
    
    if (Amount <= 0 && IsValid(Slot.GetItem()))
    {

    Slot.SetItem(nullptr); // if we run this, the fast array item wont call its PostReplicatedChange method on client
        Slot.SetItem(InventorySlots.Items[0].GetItem()); // this would work (because InventorySlots.Items[0].GetItem() will return a not nullptr ptr)
    }
    
    InventorySlots.MarkItemDirty(Slot);
    OnPostReplicatedChange(Slot);
}

// FA Item

UPROPERTY() TObjectPtr<USLItem> Item = nullptr;

void FSLFastInventorySlot::SetItem(USLItem* NewItem)
{
    Item = NewItem;
}
bool FSLFastInventorySlot::NetSerialize(FArchive& Ar, class UPackageMap* Map, bool& bOutSuccess)
{
    Ar << SlotIndex;
    Ar << Item;
    Ar << Amount;
    Ar << MaxStackableAmount;
    Ar << CachedItemTag;
    
    bOutSuccess = true;
    return true;
}

after some testing the issue only happens when changing the Item property to null

[ashen plume]

ive been working through a custom cmc in c++, and saw that this is being called by phys custom, but theres is actually zero documentation on using it

[kindred widget]

Was this thing already on the client and then these were set and replicated again? Because Change only runs on changes. If you add and set all of this data, it will be considered an add.

[lament flax]

Im adding once but very early before i run into this problem

The weird thing for me is it breaks when setting the member Item to nullptr (or maybe any other value)

[elfin creek]

i would say that the normal way (not sure if it is the best way) would be inside your game state on a server event to go through the players array and call the play animation function on each player state or player controller

[thin stratus]

A multicast should work fine too if called inside the GameState or the Component (if marked as replicated).

[verbal vapor]

XD

did the guy really come here to shit on people using UE

[clever hound]

Do I need to set the mesh component to be replicated if I want to set the **visibility **of the mesh via OnRep function? It doesn't seem to work without setting the whole component to be replicated

[lament flax]

no you dont need to

but the class (i assume actor) where you have your visibility onrep needs to be set to replicated

[clever hound]

The bools are the replicated variables which should fire the OnRep.

void AVRPlayerCharacter::OnRep_SkinStateChange()
{
    ArmsSkinMesh->SetVisibility(bShowArmsSkin);
    NeckSkinMesh->SetVisibility(bShowNeckSkin);
    TorsoSkinMesh->SetVisibility(bShowTorsoSkin);

    if(OwnedCharacterDisplay)
    {
        OwnedCharacterDisplay->ArmsSkin->SetVisibility(bShowArmsSkin);
        OwnedCharacterDisplay->NeckSkin->SetVisibility(bShowNeckSkin);
        OwnedCharacterDisplay->TorsoSkin->SetVisibility(bShowTorsoSkin);
    }
}```

Then I set the bool on ServerRPC

[lament flax]

show what is SkinStateChange

also, are you using a listen server ?

also, apart if you are doign some custome net serialization, each bool will replicate randomly on their own

so when you run OnRep_SkinStateChange, some bools might not be updated

[clever hound]

You mean dedicated server? No / testing in the client mode

[clever hound]

What do you mean?

UFUNCTION()
        void OnRep_SkinStateChange();```

[lament flax]

show your PIE settings

here

[lament flax]

what property calls that ?

[clever hound]

Playing as Client ofc

[lament flax]

okay so your server is a dedicated one

[clever hound]

void AClothingBase::EquipClothing(AVRPlayerCharacter* Player)
{
    if (HasAuthority())
    {
        if (Hat)
        {
            Player->HatItemData = InventoryItemData;
            Player->RepNotifyHatMesh = InventoryItemData.DisplayMesh;
            Player->OwnedCharacterDisplay->RepNotifyHatMesh = InventoryItemData.DisplayMesh;
            
            Player->bShowNeckSkin = bNeedNeckSkin;
        }```
And then there is ```Player->OnRep_SkinStateChange();``` bellow that
Is that what you mean

That is in AClothingBase

[lament flax]

this isnt how OnRep function should be used

you usually bind them to a property, when you change the property on server it will call the OnRep on client (depending on your replication settings)

[clever hound]

        bool bShowNeckSkin = false;
    UPROPERTY(ReplicatedUsing = OnRep_SkinStateChange)
        bool bShowArmsSkin = false;
    UPROPERTY(ReplicatedUsing = OnRep_SkinStateChange)
        bool bShowTorsoSkin = false;```
it does

[lament flax]

so there is not variable SkinStateChange

you should rename it (the function)

[lament flax]

are each of these bools set to replicate on the actor GetLifetime.... function ?

[clever hound]

Ahhh

[clever hound]

yes
DOREPLIFETIME(AVRPlayerCharacter, bShowNeckSkin);
DOREPLIFETIME(AVRPlayerCharacter, bShowArmsSkin);
DOREPLIFETIME(AVRPlayerCharacter, bShowTorsoSkin);

Ok so I should set seperate OnRep function for each of the bools

[lament flax]

you should do the following:

    UPROPERTY(ReplicatedUsing = OnRep_bShowNeckSkin)
        bool bShowNeckSkin = false;
    UPROPERTY(ReplicatedUsing = OnRep_bShowArmsSkin )
        bool bShowArmsSkin = false;
    UPROPERTY(ReplicatedUsing = OnRep_bShowTorsoSkin )
        bool bShowTorsoSkin = false;

void AVRPlayerCharacter::OnRep_bShowNeckSkin()
{
    NeckSkinMesh->SetVisibility(bShowNeckSkin);
    if(OwnedCharacterDisplay)
    {
        OwnedCharacterDisplay->NeckSkin->SetVisibility(bShowNeckSkin);
    }
}
void AVRPlayerCharacter::OnRep_bShowArmsSkin ()
{
    ArmsSkinMesh->SetVisibility(bShowArmsSkin);
    if(OwnedCharacterDisplay)
    {
        OwnedCharacterDisplay->ArmsSkin->SetVisibility(bShowArmsSkin);
    }
}
void AVRPlayerCharacter::OnRep_bShowTorsoSkin ()
{
    TorsoSkinMesh->SetVisibility(bShowTorsoSkin);
    if(OwnedCharacterDisplay)
    {
        OwnedCharacterDisplay->TorsoSkin->SetVisibility(bShowTorsoSkin);
    }
}

[lament flax]

yup

[clever hound]

I just tried to make it cleaner by doing it with 1 function

But nvm then

[lament flax]

yeah thats not how it works

[keen adder]

Heya, so I noticed my OnRep vars in my Movement component happen instantly
(Switching animations and stuff)

But my OnRep vars in my PlayerStats (switching items the player is carrying) take about 0.5-1 seconds from server->client

Is there a legit reason for this? The code in both is nearly identical

[upbeat basin]

If I want my actor to receive function calls on server from any client at any time, I am forced to have a server RPC on any of my locally owned actor which calls the desired function on desired object, right?

It feels like a bit of an overhead to be required to implement a new server RPC each time I need to send something to server over an actor that clients doesn't have ownership over it

Am I missing something that can be a workaround for this? Like for the reverse, I sometimes use multicast RPC with a pawn or playerstate parameter to check locally controlled state to simulate sending a client RPC without having ownership over an actor

It's not an issue to do actor on client->state/controller/pawn->actor on server but it feels like the mediator actor is gaining unnecessary dependency due to this

[hoary spear]

Actor on client -> controller -> actor on server ?

Ah nvm slashes between

I sorta had the same issue, but dont really have a super way of solving it

Ended via via via, to ensure everyone knew what they needed, and server got the memo

Helps that my initial interaction is server sided (for now)

I kinda dont wanna update ownership all the time either

[gilded vapor]

You can use instancedstructs to send unspecified payloads opposed to rewriting the replication code each time

The design is intentional as it’s an implementation detail of a server-authoritative system

Like clients are only connecting to the server bit other clients, so unless you wanted an actual P2P system you’d still be tripping from client to server to other client

—-
For a lot of systems you seldom need to multicast an rpc, usually just server RPCs and use replicated variables to keep everything in sync

[upbeat basin]

I'm very confused over your answer. I'm not looking to break server authoritative system. I still want to send something only to server from a client. I just want any client to be able to do this over an actor

[upbeat basin]

PlayerStates have a lower net update frequency by default. You either need to increase it or update your logic to depend on more frequently net updated actors

[gilded vapor]

I understand what you want to do, I'm just explaining the rationale behind why this isn't supported by default

[keen adder]

Ahh I see the options now, thanks man!
Would you happen to know is there's a good reason PlayerState is set so low? (1/s vs 100/s on a pawn)
Or is it just because things like Score and stuff aren't as important as pawn features

[upbeat basin]

But how does it differ from calling a server RPC on player controller that calls the function I want to call on the specific actor?

[gilded vapor]

because if you were allowed to call an RPC from any actor (by default) that would basically be the equivalent to "Client Auth" because any client could do anything (**Im glossing over some details here)

[gilded vapor]

but by restricting what functions you can you're limiting the ways other clients could send malicious requests

[upbeat basin]

I don't know the actual reason but I believe it's kind of what you said, pawn is your player's visual representation on other clients so it's updated more frequently to provide a smoother gameplay for everyone, while your player state is more about background states. But that's my opinion

[gilded vapor]

You're correct that its really just because score and stuff isn't as important~~ (at least that was the original rationale) though you can set its update rate to whatever you want if you need to (Basically its just a mini optimization)

[keen adder]

Yeah, awesome. I set it to 10/s and it looks instant already. 😄

[upbeat basin]

I mean, for this specific case, I'm trying to implement a QTE, very similar to generator repairing in dead by daylight. Multiple players can interact so I can't set an owner to the actor. But players need to send their input for server to check if they succeed or failed. Right now my only option is sending the time offset the input is pressed over player controller server RPC to the actor player is interacting with. I still can't understand how would it differ for this case to let players send that float value directly with the interacted actor instead of using player controller as the mediator

[gilded vapor]

There's nothing stopping you from coding your game to manually achieve this

but there are good reasons why this isn't the default behavior~~

---

If you need design suggestion

I would make an interface for interactible actors. And the player-controller will be responsible for calling ServerInteract which takes an AActor (that implements the interface) and an FInstancedStruct that represents an abstract payload the interactible can use for parameters

(This eliminates having to rewrite the replication code for each interactible and still supports different parameters)

[upbeat basin]

Well for the sake of stating it, I'm against interaction interfaces, I prefer components for that logic. And interaction part is kind of out of my question. But thanks anyways for your answers

[gilded vapor]

Component would be totally good too~~
I only brought up interaction as you mentioned the generator-repairing interaction as the example for your QTE

[bold shell]

I am using GameState for an array of pictures that most server and client can see. it half works but the client just shows black. on the client GS they show up as unknown

[thin stratus]

Are those assets or runtime generated?

[thin stratus]

You can't replicate those.

At least not directly like that.

You'd need to take the photo on everyone individually, so replicating the action of the taken the photo, or you need to replicate the byte array that represents the photo, which is probably not a thing in Blueprint.

[lament flax]

Cedric do you know if NetSerialize handles giving nullptr to the archive ?

[thin stratus]

wdym

[lament flax]

i got an issue, and its linked to the fact to give nullptr for an archive

#cpp message

[bold shell]

alright thanks for that

[thin stratus]

No clue, never tried that. Replicating a nullptr should trigger OnReps just fine. Might be your FastArray setup

[bold shell]

i would probably need someting like this right?https://www.unrealengine.com/marketplace/en-US/product/replicated-texture

[lament flax]

then i wonder what i did wrong lol, if i give anything than a nullptr it works fine

i also tried with a rw ptr instead of a TObjectPtr

[thin stratus]

Yeah, if you can't code it yourself, you'd need to fall back to that.

[weary badge]

Hey everyone, I'm trying to create a prottype for a multiplayer, but I'm already stuck pretty early.
For some reason when I spawn and possess the characters, the client's character works just fine, but the server's character is unable to move.

• The movement is the base movement of the ThirdPerson Template (Enhanced Input Action) Also doesn't trigger a print.
• The Attack Input I created works on both client and server

The picture is basically all I've done so far...
I wouldn't mind sharing the screen in a discord call.

[quaint rain]

I’d like to get a sense of how many players my server can support.

I have quite a bit of logic on my player controller.

At a high-level, how would I go about simulating player activity?

For context: all of my player and NPC movement is server-side AI controlled. Controller sends RPCs and lets the player issue movement/action commands to server pawns.

[lament flax]

the player part sounds very terrible

you are saying that you send inputs with RPCs to the server ? and that the server will run the movement logic ? (suc as Add Yaw input) ?

[quaint rain]

Server uses ai move to

[lament flax]

you said player

AI runs on server so its fine

[quaint rain]

Server-Ai controlled pawn, player issues commands to ai controller which issues commands to pawn.

[lament flax]

wdym with "player issues commands "

i need mroe context here

are we talking about movement inputs ? (wasd)

[quaint rain]

Haha, sorry. I’m not so familiar with exact terminology.

It’s a click-to-move RTS style movement. Player controller gets location on click, sends a command to the pawn, pawn ai controller uses “move to” to go to the location.

Pawn actor is owned by server and will persist while player is offline.

No WASD

[lament flax]

ah i see

[quaint rain]

I can spawn about 300 of the pawns before the navigation system fails.

But I’m wanting to get a sense of how “heavy” a player controller is. Can I get 20, 40, 100 connections?

[lament flax]

so each player has some pawns to control ?

[quaint rain]

Yeah, each player gets 1-3 pawns

[lament flax]

to simulate that i wont do some random clicks and actions multiplied by the number of players

so you need to make a sort of Editor AI only bot to simulate events like a player would do

[quaint rain]

Since I have so much logic tied to the PC, is there a way to recycle that logic without having to re-write the PC?

Is it possible to manually spawn 50 PC, or do they require an active player connection?

PC=player controller

[lament flax]

you can launch a game with as many player you want

the issue is how do you want to simulate 50 player playing

[weary badge]

@lament flax couldn't you just loop a timer on event that launches player inputs

[lament flax]

yeah, some random timers with random actions

[weary badge]

yh select on random int

[deft onyx]

Does anyone know if it is possible to do peer-to-peer multiplayer on current consoles or are their any limitations/restrictions to the networking on PS5, XSX or Switch? Or does console network has to be client-to-server?

[kindred widget]

Unreal doesn't have peer-to-peer networking.

[torn zinc]

Trying my hand at some multiplayer. How exactly can i just allow the client to do whatever and make sure it has authority to do so, disregarding cheating etc?

[kindred widget]

Depends. Does everyone need to see it still?

[torn zinc]

Yeah

[kindred widget]

Then the same way you would do it with anti-cheat. Client tells server what it wants done. Server does it. The only difference is that you don't care about validations.

[torn zinc]

Oh, was hoping for something simpler

[kindred widget]

I'm not sure what would be simpler. Server has to tell everyone what is happening. So it has to do it. You aren't going to get much simpler unless you cut out multiplayer.

[torn zinc]

Fair enough

[static owl]

Hi everyone! Im new here. I was just wondering if anyone had the time later to help me understand some replication?

Im literally jus trying to get a door safe to open on the server and client from an interaction key!

Would really appreciate some help by jumping into a call and sharing my screen later if possible!! Thanks

[daring gorge]

hi everyone, im facing a weird issue where my attach actor to actor isnt setting the right rotation on client?, i basically want to attach a player character to a boat. the boat consists of a child actor component that stores sockets of "seats". when a button is pressed it runs a server event that launches a line trace which if hits a boat disbales collision on capsule and then runs a "interact" interface, this in boat calls a server RPC which runs the seat func from the chair component. my issue is that i want the player to face the forward axis of the boat, this happens on the server but not when i play as a client. anything im missing?

[daring gorge]

ive fixed it! it was quite stupid, the client never knew of the attachment

[quiet yarrow]

Anyone know how to replicate Timelines?

[sinful tree]

Timelines have a built in replication setting. You'd have to trigger the timeline inputs on the server for it to replicate to everyone else.

[quiet yarrow]

lmao

why was that hidden

[torn zinc]

Trying to rotate my character, but it's not letting me. I thought this was the right way, to replicate to server then multicast? Or am i missing something

Nvm, it works. I messed up, however, it is a bit laggy

But seems like making it reliable solves it.

[dark parcel]

Not how you should replicate rotation

Don't use multicast

You simply need to replicate the rotation variable

Have owning controller set the rotation on server with server rpc

For proxies, they can interpolate to the I coming rotation on tick

That's it

[torn zinc]

Aaah. I didn't understand this tho: For proxies, they can interpolate to the I coming rotation on tick

[dark parcel]

Are you aware of network roles?

If not run through the pinned materials

Proxies are the other characters that I don't control in my machine

Btw tip number 1 just avoid multicast on anything stateful it will never work

[torn zinc]

Ah ok, yeah i am somewhat familiar with it, just didn't know that's what proxies meant

Ok, good tip, thanks 😄

[dark parcel]

Does other played need to see the same thing? Yes? Then multicast has no place in it

As they can get dropped and straight don't run on late joiners because they are not in the game yet

Then there's relevancy too

[torn zinc]

Ok, makes sense

Oh yeah much better, smooth now

[quiet yarrow]

Anyone know why this "springyness" happens when I use constraints or how to turn it off? I think its causing jittery physics in multiplayer

I messed with a few settings now and nothing seems to change it

[torn zinc]

There is a setting on the constraint for bounce. I just turned off my computer and dont remeber what it was called

[quiet yarrow]

only thing I could find was this:

and I have it at 0

im new to constraints. Maybe I need to have it setup different

[static owl]

I am not understanding why the safe door will not open for the client (Also the client cannot open it for the server either).

This was apart of a Computer system that can open the safe that i download from unreal, but it was not made for multiplayer, so I am trying to implement that.

The code is a little rough, but basically As i have it now: The SERVER OPEN near the E key press runs on SERVER. Then near the print text node, Open Door Success is ran, and the OPEN variable is set to true.

Then, Open Door Success is multicast, which runs Opens Door which is multicast as well.

[dark parcel]

@static owl daily reminder don't use multicast on stateful behavior

Does everyone need to see the same stage for the door? Yes? Don't use multicast

[dark edge]

Where in your bit of code is the run on server event that tells the server that the client has pressed E?

The general form is this simple.

Input -> run on server event
run on server event -> set a variable (replicated, repnotify)
OnRep_Variable -> change stuff based on the variable

[static owl]

what do i use then ?

[static owl]

So if i walk up to the safe to open and press E, (the interaction is handled in the safe blueprint), then where do i go from there?

Does the interaction need to go through the player controller or my character blueprint somehow? Or can the server and client replication all be within the safe blueprint logic?

[dark parcel]

❌ to multicast for stateful behavior, read what Adriel says on how you should go forward,
if you can't do that. Try to sync a simple boolean value accross players first before you tackle your door again.
❌ to handle inputs in the BP_Safe or the door

[plucky pewter]

Huh...So it seems that suddenly I can't change gameplay tags at run time?
I have a gameplay tag container.
By default it starts empty.
And depending on some stuff the value of that tag container is going to be Team.A or Team.B?
I don't know what has happened because I thought I had been setting it at runtime before....?

[bold shell]

would it be as simple as setting the custom even that takes the picture to multicast? because that isn't working

[plucky pewter]

Any solutions you guys use for separating teams in a general context?

[dark parcel]

Multicast is just server telling all the clients to run the function, so if done properly it will work but the gotchas here since latency exist, each players may not see the same photos (Picture pawns and your own controlled character walking around).
Since lag exist, the time where the function gets called varies respective to each machines.

Also any late joiners, will not take the photo so really the only viable solution is most likely to write implementation to replicate textures or send the data over the network then have the receiver reconstruct the image from the byte