multiplayer

[swift bay]

Hey guys, could someone point me in the right direction? I am currently trying to do the following: I have a GameInstance Subsystem that offers functionality to create and join channels (like the one in WoW for example, /1 General, /2 Trade etc.). As GI Subsystems cannot replicate, I want to create an Actor for that Subsystem to replicate relevant information, as Epic suggests. Therefore I tried to create the ReplicationHelper Actor in Initialize of the Subsystem , however only the server spawns the Actor. I also get following warning:

LogNetPackageMap: Warning: FNetGUIDCache::SupportsObject: ChannelManager /Engine/Transient.UnrealEdEngine_0:GameInstance_16.ChannelManager_0 NOT Supported.

bReplicates is enabled for the Actor.

I added logs, the initialize of the GI SubSystem is invoked on all players (Server&Client), but the spawning does not work. I thought about it and I assume the spawning from the client has to happen via a RPC to the server? If that is the case, this will not work as I can't trigger a Server RPC via a GI Instance?
Should I spawn this actor via playercontroller for example?

Any advice would be appreciate!

[coral badger]

As a general rule of thumb you always want to host on Linux for scaled production, as it is usually about 4x cheaper.

[manic trellis]

hello,
there I am working on a basic Multiplayer setup in which I am having problem like,

• late joiners did not get the replicated information for all the previously joined users.

thanks in advance.

[woeful ferry]

yes, it is

[cosmic yoke]

hello, in my multiplayer project i can swap between pawns and i'm trying to detect when the controller changes for a pawn and i've noticed that for clients the OnRep_Controller function, NotifyControllerChanged function and the ReceiveControllerChangedDelegate delegate don't always trigger, isn't this a bug?

it makes it hard to reliably do changes that depend on that, i had to use OnRep_PlayerState instead

[chilly haven]

Thanks for that info

[fossil spoke]

Generally speaking yes.

However I cant remember if the engine manages resolving an unloaded class on the Client from the network.

I have come across problems before where it hasnt. Mind you, this was on a replicated property.

It might be worth you doing a test where you force preload the class on the Client and then send the RPC to see if that correctly resolves the class.

[unique kelp]

Thanks, I ended up changing it to a replicated property and it seems to be working always now, but i'll test and see if preloading helps

[fossil spoke]

Depending on how you are using the property you may have inadvertently caused the class to load on the Client.

[unique kelp]

When I changed it to a replicated property it is now using a TObjectPtr, so that might have been the solution

[fossil spoke]

I doubt it. TObjectPtr only really has advantages when working in the editor.

Its functions the same as a raw pointer in any other context

AFAIK

[unique kelp]

hm, I'll keep digging then, see if it pops up again

ty for the help!

[quartz star]

Hey there, just to make sure, the ELifetimeRepNotifyCondition REPNOTIFY_Always will trigger the OnRep Function when I change the value of the variable on the server without having to call the OnRep Function manually?

DOREPLIFETIME_CONDITION_NOTIFY(ThisClass, CurrentShipSpeed, COND_SimulatedOnly, REPNOTIFY_Always);

So in my case, if i change CurrentShipSpeed on the server, it triggers the OnRep_CurrentShipSpeed automatically?

[past meteor]

Correct

If you have set your UPROPERTY on CurrentShipSpeed to be OnRep_CurrentShipSpeed

[quartz star]

alright thank you

[woven basin]

It will always call the OnRep to all clients if the value changed or not (i.e. X is 2 before and after, it will still call OnRep). The alternative is it will only call OnRep to clients if the value changed on the server (i.e. X is now 3 instead of 2)

Regards of either setting - it wont call OnRep on the server itself for its local copy in c++. You have to call that manually if you want the server to call itself.

[quartz star]

yeah makes sense, but calling the OnRep on the server itself wont cause the clients to call the OnRep twice?

[woven basin]

nope - its just calling a local reference to OnRep - it is not saying "Hey replicate this again"

[quartz star]

okay nice, thank you 🙂

[fossil veldt]

Round 2 😂 Codebase is entirely rewritten, Fully MIT this time no Quake.
https://github.com/daftsoftware/FGMovement

It's not as far along as it was but oh well, I gotta try and get it to feel as nice as it did

[lost inlet]

so how's Mover?

[thin stratus]

Depends on what you want to hear about

[lost inlet]

it was more of a reaction to the above link which is using Mover

[fossil veldt]

It's fantastic

It's just an extension of NPP really hiding much of the uglies away

[thin stratus]

Mover itself is really not doing too much. Basically just a StateMachine

+- some helper features specifically for movement

It stands and falls with NPP

[fossil veldt]

yea it's really just a big wrapper and CMC modularized into utils

[thin stratus]

Currently trying to figure out how they want Swimming and Transitions for it to work out. The Native Mode is not finished.

[fossil veldt]

and the layered moves system is freaking awesome

the fact you can take any movement system and just bolt on root motion is the shit

[thin stratus]

Yeah, I'm a bit annoyed by their "Refund Spent Time" stuff

[karmic briar]

im still confused with Mover API to be honest

[lost inlet]

so yeah I hope NPP gets some love through this

[karmic briar]

seeing other peoples implementation usign Mover genuinely help me a lot seeing how to utilise it

[thin stratus]

Mover allows to do the same stuff in different ways fwiw

Snaps, for example, implements Crouching through a LayeredMove in the linked repo, with MoverTransitions.
Pretty sure we don't do that and we also wouldn't want to do that. Depends on the game.

Although it looks like the CrouchTransition is not used, but either way, ours isn't a LayeredMove.

[thin stratus]

Maybe. As of right now it is still in maintenance mode afaik.

[lost inlet]

very dissonant when there's a movement plugin in active development using it

[thin stratus]

Think the plugin has less than 5 peeps working on it. There aren't many commits for it either. Last stuff iirc was some fixes to BasedMovement, but as of right now, I get big corrections when landing on a moving Platform with that.

I wouldn't suggest switching to Mover/NPP if you can't fix/add stuff yourself, or unless they show more interest in pushing it further.

As much as CMC is a pain, it's probably the more robust solution for movement by itself.

Think the only reason we moved over to it is cause we tied multiple Simulations (e.g. Weapons) into Movement prediction and that is overall easier with NPP/Mover.

[fossil veldt]

yea there's really a few ways you can implement it

you can literally just scale the wish vel in the walk mode itself if you prefer, Crouch layered move just made more sense to me

that's the thing I love about Mover actually is that it doesn't seem to necessarily care so much what you do with it or make so many rules on how to use it

[woven basin]

but Mover2.0/NPP offers no further intergration with GAS - is that correct?

[fossil veldt]

Depends rly what you mean I guess

[woven basin]

stamina/predication/running and all that fun stuff

with rollbacks/corrections

[fossil veldt]

you can do that as far as I can tell

I talked alot w @pallid mesa about this

I think for stamina specifically youd implement it as a blackboard value

and then externally set it from the GAS ability

There's a line between using sync state and blackboard that is at the moment unclear to me, but I believe blackboard is more suitable for externally available R/W states

[half iris]

Would anyone know how to properly handle a player disconnecting from a multiplayer session when using the Advanced Sessions BP plugin?

I am wondering if this requires particular steps that are handled from the plugin, or if there is engine bp functionality that should be ran instead

[half iris]

Ah looks like the destroy session node seems to also be suitable for the client to use it.

[torn hawk]

Hi, any idea why is this?

It is a new project using the ThirdPerson templete

[thin stratus]

GAS does not use NPP. So you are correct in thinking this doesn't solve any GAS or GAS+CMC prediction issues

NPP only solves CMC+OtherSimulation

Or at least could solve

[woven basin]

cool - thought so based upon the conversation a few days ago. Was just double checking.

Back to GMC then...

[thin stratus]

If you only need a better Movement system, that's probably an option yes

If you also want to tie in other predicted simulations, then you might want to give Mover a try after all

[woven basin]

yeah - GMC has been pretty good so far. It actually has all the other stuff like sync'd network clock etc sorted as well, so it kind of is more of a prediction system with movement built on top if that makes sense. I'm in the early days, but the discord chats seem positive and a few smart people in there doing good things, so that is always a good thing too

(I know there is a network clock sync blog in the pins in here, its just an example of how GMC solved a few things that are all related for one related issue)

[quasi tide]

GMC also offers this btw. I've seen some people hook into its system for their weapon logic for example.

[woven basin]

yeah - that's what I'm exploring now.

And they have built a GAS alternative that ties directly into GMC - so all your "gas" style stuff is directly linked into movement. So ability rollback, cooldown prediction etc - its all handled inside of GMC. Seems cool so far.

[thin stratus]

Sounds nice

[woven basin]

meh - the release of Mover 2.0 - its a valid discussion to determine which path people want to go down. And there are demos on the marketplace page?

[lament flax]

Hello

How should i combine a GAS sprint abilty with the CMC to make everything smooth between owning client and other clients ?

[quasi tide]

Pro - it comes out of the box with UE 5.4. But in preview mode.
Con - don't know if Epic even cares about it.

It's still far too early in its lifecycle

[lost inlet]

the bar is pretty low for Epic caring about something

"is this used in Fortnite y/n?"

[nocturne fiber]

Hello everyone.
In the sea of struggling there's my voice that echoes around many others.
And here i am, asking again for support from those who can swim better than me.

I have a problem ( of course)

not only mentally ( at this point) but in a more concrete way and precisely about player controller.

i'm a little fish that knows very little about programming and even if this is the reality I'm already working on a multiplayer game.

yes i know that is bad , I know that is difficult , much more than a single player, but this is my actual project.

now the question is ( hopefully being read from those willingly to help) why the heck my controller does not work with client side?

[dark parcel]

client only have their own controller

wdym controller doesn't work with client side?

what does thatt even mean

[nocturne fiber]

I switched place for input setting from character to controller cause in this game there are many characters( bipedes and spaceships)

why the normal setting does not work in my client?

[dark parcel]

what tnormal setting

what actually don't work

[dark parcel]

I don't know what "normal" is

on posses run on server machine

when u bind input, u want to do it in that target machine

[nocturne fiber]

okay and how can I use this on client

cause my client didn't respond to command

but worked a month ago

I don't know what's wrong

[nocturne fiber]

nice, how to do that?

what am I missing?

on possess, possessed pawn should return every possessed pawn

why there isn't trace of my client pawn?

[dark parcel]

On posses run in the server machine only

[dark parcel]

run the code in client side if u want to bind input

in other word dont do it OnPosses

[nocturne fiber]

?

a rpc?

with custom event?

[dark parcel]

I bind mine via AcknowledgePossesion

that function run on client

[nocturne fiber]

mmh

[dark parcel]

but that's not exposed to blueprint

u can do RPC client if you don't do cpp

altough I wont touch multiplayer without knowing cpp

[nocturne fiber]

maybe is better stick to standard "input on character blueprint" instead having these on controller at this point

[dark parcel]

on Possess -> Run Client RPC Function that binds input

[nocturne fiber]

why the print on character blueprint outputs the same C 0 controller on server and client?

I managed to get both player moving now ,but I wonder if there's a problem in the logic

[thin stratus]

Sprint fully in CMC, GAS ability local only that only calls Start and Stop sprint on the CMC

[nocturne fiber]

cause when I print on character it says this.

[dark parcel]

Client only have 1 controller in their machine. It will always be C_0 For them

[nocturne fiber]

so it's normal?

both controller have the same name

how can I rename it

[dark parcel]

one problem at a time

fix the bind input first?

[nocturne fiber]

already have both character working now

on character blueprint

both moves and replicates eachother

[dark parcel]

Begin play is the wrong place to do multiplayer stuff most of the time

[nocturne fiber]

okay

[dark parcel]

@nocturne fiber Read the compendium and see what objects are replicated

then read it 12 more times

[quasi tide]

I think this is in @chrome bay or @thin stratus territory.

[latent heart]

It is still the "same" q3 movement, just not based on quake code?

[lost inlet]

legally distinct q3 movement

[fossil veldt]

It’s not quake based anymore

[latent heart]

And the other thing?

[torn hawk]

.

[fossil veldt]

which do you mean

[latent heart]

Well I asked if it was still teh same movement, just no longer based on quake... and you replied that it was no longer based on quake.

[fossil veldt]

it's not the same movement no

[latent heart]

Ah ha.

[fossil veldt]

It's a custom implementation this time by myself

mileage may vary

[latent heart]

Similar to quake?

[fossil veldt]

Not sure really, I'm just cooking and seeing where it ends up

[latent heart]

Ah. Fair enough!

But cool stuff. Thanks for sharing. 🙂

[fossil veldt]

No worries!

I'm not happy with how it feels atm, especially the damper force calc, it started feeling much more sluggish than before

so that's atm my priority to fix

you can get it feeling nice ish by playing around with the WalkSpeed and AirDamping cvars but aiming to get it feeling good out of the box, people were sad I took the sample down so i've put it up really before it's ready for prime time

The basics are there tho

I accidentally made it feel like the CMC lol

https://tenor.com/view/no-the-office-michael-scott-scream-gif-16929305

[latent heart]

Cool cool. At least one of my guys are taking a look to see how you've done stuff! Make sure they haven't messed up something simple!

[fossil veldt]

hah

[latent heart]

Have you tested it over the network yet?

[fossil veldt]

yep was workin fine

[latent heart]

Sweet!

I do wonder how it'll cope over the network for us. We'll be doing speeds of up to hundreds of m/s.

[fossil veldt]

If you test it out lemme know! my goal is to get it highly battle tested

[latent heart]

Will do!

[fossil veldt]

I'm using it for my own game so any of the changes I do there are going to trickle down

[latent heart]

What sorta game you making?

[fossil veldt]

It's a voxel factory game

[latent heart]

Neat!

We're going to utterly fail at mp fps 😄

[fossil veldt]

hah nice! fps is fun

[latent heart]

It's our passion.

[fossil veldt]

I decided this time around to go with something other than FPS since I made FPS for pretty much 10 years straight

[latent heart]

Cool!

[fossil veldt]

it's so damn fun, but yeah it's kinda fun to solve some new problems

factory game has some interesting ones

and voxel too

[latent heart]

Well if you wanna help out on a community project involving a different kind of fps, you're welcome to join! 😛

[fossil veldt]

Oh neat, ur project is open source?

[quasi tide]

Heck yes - time to commit some awful code.

Someone has to. Keep you on your toes.

[latent heart]

Nah, not open source.

[fossil veldt]

going to start replacing all the types with auto

[latent heart]

auto Auto = auto()

[quasi tide]

Each commit message will just be "I'm sorry"

[latent heart]

Lol

[fossil veldt]

Sure, can't promise I have much time outside my game and work but can be fun to help out every now and again

[latent heart]

Neat!

[fossil veldt]

I sent a friend req

[quasi tide]

https://tenor.com/q4D2.gif

@fossil veldt So OnGenerateMove just creates the state and OnSimulationTick is what does the actual movement?

[fossil veldt]

Correct

Generate move creates a substep

simulation tick aggregates all the substeps applying them as 1 move

Mover is a little funky in that they mixup the "substep" terminology, in mover terms a generate move is a "sub tick"

substep is like, each component of a move

as far as i understand it atm anyway :)

[quasi tide]

Too much 🧠

Why no Thing->JustFreakingMoveCorrectlyDangIt()

[fossil veldt]

it's not that arcane tbh you have proposed moves which are a move generated by a substep and then the move record which is like a list of moves that happens

and you can use the move record to collapse all of the substeps down into just one move which then the NPP tick can process

and it allows you to handle relevancy for specific moves

[sinful tree]

https://tenor.com/view/easy-red-easy-button-red-button-gif-4642542

[fossil veldt]

Why no Thing->JustFreakingMoveCorrectlyDangIt()
Also tbf that is actually pretty much what generate move is btw

the rest is really more than anything boilerplate

[dark edge]

what's your approach to game state for the factory stuff?

I'm working on a graph physics engine that's great for that sort of stuff and I'd like to extend it to handle factory game things

[fossil veldt]

https://github.com/daftsoftware/GameStateSubsystem

Modularized into DOD subsystems

the voxel stuff is on voxel module on it's own subsystem, factory stuff in the game module on a subsystem

[dark edge]

Sounds a lot like my approach.
Subsystem per thing type (would be 1 or many depending on how different the data is for each factory type thing)
Subsystem per domain (ItemQueue for factory game, power, etc)
The subsystems each hold an array of the data type they care about. FactoryModel for the one, and ItemQueue or BeltSegment or whatever for the other.
Then it's just a few graph functions to hook it all together, condense chains of BeltSegments into single instances, and let FactoryModels know what BeltSegments they are yoinking from and yeeting to. The whole sim runs without Actors, the Actors are just a view of it.

[quasi tide]

They're both European and it is Friday night for them. I'd imagine it'll be a minute before they interact.

[lament flax]

its only 21:00

and was 18:00 when you first pinged

[quasi tide]

So? After an entire week of looking at UE - they probably don't want to.

[lament flax]

true

im just saying its not night night

[modest crater]

Impossible

[quasi tide]

Fine - let's ask the other resident expert on multiplayer: @fathom aspen

Here ya' go WC: #multiplayer message

[fathom aspen]

I'll say UB since I don't know 😄

Do latent actions get associated with the actor? I'm not really sure of their instantiation/association process, but I have a high chance of beliveing they will get destroyed all along

[quasi tide]

@whole grove 👆

[unique ferry]

weird thing happening i used a line trace to figure out where my object is spawniing and it is spawning but it is invisible in multiplayer, but not sp, why?

component does replicate?

[runic pelican]

Hello, i'm new on the discord and i need some help, where can i expose my issue ? I have a multiplayer issue

[unique ferry]

Probably here lol

[runic pelican]

Perfect !

So, the probleme is : i have a smal HUD with variable (like mana progressbar and stamina progresse bar) I can use it perfectly but when i start to replicate. The server use the HUD client and the client use the HUD server. Any Ideas ?

small*

[fathom aspen]

Oh ok, good to know, because I don't think this applies to UObjects as well, or do they? hmmm
For travelling you don't need a multiplayer environment, no?

[unique ferry]

I followed a tutorial for mine, I think it does everything on client side, I can send you link

[sinful tree]

Widgets/HUD is all local, doesn't really have much to do with multiplayer. You just need to ensure that your widgets / HUD is reading from the correct actors, and that you're not creating widgets on "begin play" of actors like the character without some checks to make sure you actually want to create the widget for the local machine.

[runic pelican]

Oh yeah if u have it !

[fathom aspen]

World collapses

[runic pelican]

i create my widget from the begin play ! so i have to move it. So i have to check on whitch actor i create ? event if the 2 players come from the same character ?

[fathom aspen]

Fingers crossed!

[sinful tree]

You don't necessarily have to move it, but you need to have some kind of check.... For example "Is Locally Controlled" into a branch, and if true, then maybe you'd want to create the widget.

https://tenor.com/view/spongebob-eyes-burn-cannot-unsee-burned-in-my-memory-gif-4950537

[runic pelican]

OK thank you ! i will try

[fathom aspen]

I've never been as enthusiastic, since the last time you tried LC and it collapsed magnificently

Right, feels like the best addition ever

Like why do we have this

Yeah last time I saw it was in one of the outdated Epic tuts

Enforcing new practices/tools by activating them in example projects by default

[unique ferry]

WP?

oh they love shoving that down people's throats

[runic pelican]

@unique ferry if u can send me the link of your tutorial, it ll be really helpfull

[fathom aspen]

I even recall making a community post on that and I can never recall what was the workaround to switch to WC

I'll give it a 3/10 if it doesn't crash

[unique ferry]

yes I have a tutorial that would be useful but I am not sure what level you are at, it's a tutorial for a health bar, but you can obviously replace health functionality with stamina, you can look at any tutorial on how to deplete stamina, then you can just replace the health variable with that instead so that it replicates, do you think you can do that? sry

[fathom aspen]

You live to learn new hacks everyday

[runic pelican]

Yeah i think i can handle it ! or i ll work harder

[unique ferry]

here you go

[runic pelican]

thanks you!

[unique ferry]

whenever he mentions health just replace with stamina and ignore the other two bars

then you just need to add depletion on 'shift' key pressed from your character bp

if you don't want pickups and stuff you can obviously skip to 5:00 @runic pelican

[runic pelican]

yeah i m allready at 5:00

[unique ferry]

actually, he might be using a function he built previously so not sure that would be useful

[runic pelican]

I will investigate

[unique ferry]

https://www.youtube.com/watch?v=UkpYtOR2AFs

If not, maybe have a look at this

[runic pelican]

i just want to understand properly how replication work. i don't realy unsderstant it all.

[unique ferry]

Sorry lol, it's been a while since I played around with my stamina stuff

[unique ferry]

Oh I have the perfect video for you

https://www.youtube.com/watch?v=ef6SeknakeU&t=848s

Literally perfect video to understand basics of mp

[runic pelican]

specially with the " is locally control"

[unique ferry]

https://www.youtube.com/watch?v=OVeo3cVTIcU

this guy breaks it down really well as well

[runic pelican]

perfect thank you !

[unique ferry]

He also has some further tutorials where he explains authority and local controls too that he will link in the video

Np, I hope it helps. They helped me.

[quasi tide]

Prefer Kekdot over Gorka.

Gorka just wants your views

[latent heart]

Did you try using it?

[unique ferry]

I agree Gorka is an idiot he loves spamming on Facebook groups and everything but his rpc tutorial is okay

I feel like he has a lot to learn still, but he's like 13

Im jealous

[quasi tide]

Don't be jealous of someone who is just copypasta

He just constantly spams. That's his schtick.

We have had to regularly fix stuff from his tutorials for people in #gameplay-ai

[unique ferry]

He is the top dog of youtube tutorials in terms of views tbh. Usually actual good people get ignored

[quasi tide]

Exactly. He doesn't actually care about you. He just wants those views.

Promote people who actually teach.

[latent heart]

In general cross-level object lookup is very janky in UE.

[unique ferry]

The engagement he's getting on his crappy 'hit and run' tutorials is amazing

Everyones like 'omg youre so great'

What part of a 2 part tutorial on how to make a survival game is great

Wheres the rest?

Smh

Kid annoys me. Told him to stop spamming and he blocked me on Facebook

Personal vendetta

[latent heart]

Lol

[quasi tide]

Because you share his stuff.

Just stop.

[unique ferry]

Lmao #boycottgorka

[honest rain]

hey everyone 🙂 I am scratching my head over an issue : I am spawning a niagara effect in my player controller that should be replicated on both server character and client character, that goes like this : event run on server => event multi cast that spawns the FX. Client side, the FX is correctly spawned for the client character and the server character so all good. Server side : FX is being spawned only for server, but not for client. Would you have any idea why ?

[unique ferry]

are you validating the player controller?

it was but a mere slip in my judgement

[honest rain]

huuuum I dont think so

[thin stratus]

You will want to post the code tbh

[unique ferry]

no, no , i enjoy a guessing game

[unique ferry]

are you sure you set the events correctly? server / multicast, who is calling the niagara effect?

is it on begin play? is the player calling it?

[honest rain]

so it is when a player is leveling up. Event level up is called on associated player controller via event run on server, then that event calls another run on server event, which calls a multi cast with spawning the effect

[unique ferry]

sounds a bit contorted, if the event level up is called then link it directly to the server node > multicast > spawn fx, ensure the component replicates perhaps?

in your niagara effect settings, 'component replicates' try ticking that on

[thin stratus]

LevelUP should already be happening on the Server

RunOnServer event to LevelUp is pretty wrong

Please show your code

[honest rain]

going to try this, but if that was the case then on the client we shouldnt see the server effect right ?

[unique ferry]

what's the point of executing on server twice?

just change 'level up effect' to multicast

and do the logic there

[unique ferry]

should display it to all tbh

[thin stratus]

Why is "LevelUp" a ServerRPC

[honest rain]

it was just a test

[runic pelican]

@unique ferry @sinful tree Thank you guys it work now !

[unique ferry]

yayyyy!

[thin stratus]

Also the Multicast is in the PlayerController, right? @honest rain

PlayerController doesn't exist on other Clients

[honest rain]

I have the server doing XP check and then level up if xp > xo required to level

[honest rain]

yes this is player controller side

[thin stratus]

Yeah so, point number 1. Never ever ServerRPC that stuff

[honest rain]

but spawning actors /effects on server should replicate them ?

[thin stratus]

The only stuff you ServerRPC are player inputs from Devices or UI

If you press the Key to fire your Weapon or whatever, that's what you RPC

Everything after that is Server side

Killing the enemy and getting XP

Is all Server-side

There is no need for any further Server RPC

If you have Server RPCs for stuff that doesn't communicate Player Input, or basically stuff the Server can't know about, then that's most certainly wrong

And point number 2. PlayerController doesn't exist on other Clients

It's Server and owning Client

If you Multicast in that, it will only reach those two

For the Server (if listenServer) only the Server

Put the Multicast into the Character or move that logic over to the PlayerState fwiw

[unique ferry]

how do you ensure that? don't you need a server node for that?

[thin stratus]

?

[fathom aspen]

ouch

[unique ferry]

how do you server side things without an RPC

[thin stratus]

The point is that you only communicate stuff to the Server that the Server can't possibly know about

Which is almost always either Input from a Device

Such as Key Presses on KB/Mouse/Gamepad

Or UI interactions (if needed)

[unique ferry]

ok and if it's anything else, do you just multicast?

[quasi tide]

I ServerRPC the enemy that I hit and do very very very little validation checks. Fite me Cedric ✊

[thin stratus]

That question makes no sense like that

Once you RPCd e.g. the KeyPress for Shooting a Weapon, you are on the Server

Every Linetrace, DealDamage, etc. call is on the Server

[fathom aspen]

I do communications via HTTP requests, fite me Duro

[thin stratus]

Unless you RPC back to the Client/s

[unique ferry]

i'm asking cause currently i have a bp of an object that spawns on beginplay and i use beginplay > server > multi

according to you that isn't right?

[thin stratus]

Why

BeginPlay already calls on everyone that this Object (Actor) spawns on

[quasi tide]

https://tenor.com/bNxfW.gif

[unique ferry]

.

[thin stratus]

But that's two different things

[unique ferry]

oh well I got confused

[thin stratus]

ServerRPC being OwningClient -> Server

[fathom aspen]

aha, if the old ones are finishing then that's a good sign to being with

[thin stratus]

I'm still sending my trusty pidgeon. Fight it.

[thin stratus]

ServerRPC the enemy. Back to the Ownership Documentation Mines with you.

[fathom aspen]

no cap I would like to do it my own via streams using sockets one day

I know it will feel like crap, but just for fun

[unique ferry]

for some reason i have a similar issue where my object is not visible on client side :/

[thin stratus]

Tbf, that's what happens in the background anyway

But it's good to maybe do it barebones once to learn what is actually going on

[unique ferry]

i spawn something and do a trace to check where it is, the trace is there but the object isn't

[honest rain]

I moved this over to character with multicast, being called from PC controller with run on server event and that works wonder ❤️

[thin stratus]

Good, now make sure you don't have a ServerRPC for Leveling Up :P

I will slap you with a printed out version of my compendium if not, I took lessons on this from Duo.

[honest rain]

I can't understand why 😮 you want to do these on client side ?

[thin stratus]

It's tricky to explain if it hasn't clicked yet for you

Like, whatever code is calling the LevelUp ServerRPC should not be on the Client either I guess

The ServerRPC in theory is fine, it's just at the wrong location. It should happen as early as whatever triggers the whole chain of events that leads to a level up

[honest rain]

well I thought that important calculations should come from server side, and I dont want to do these calculations on character since characters are only client sides right ?

[thin stratus]

The second part of your sentence is wrong

I fully ignored the question cause I have no clue what the answer is.

But thanks for sharing!

Naive thought what have been that the Latent Action somewhat shares lifetime with the object it triggered, back up to whatever world owns that

[fathom aspen]

Interesting findings... thanks for them

[thin stratus]

So I would have thought if you move worlds, the chain will nuke the latent action

If you rename the action to the new world, then idk, magic

What scenario does this question come from anyway?

[quasi tide]

Probably UE5Coro

[fathom aspen]

Taking precautions from UBs

also that

[thin stratus]

You really want to read the compendium and some other resources again.
If you think a Character is Client Only then there is a big knowledge gap.

And that might cause you to code real garbage

[quasi tide]

If I was a bettin' man, I'd say she wants to make sure UE5Coro handles seamless traveling properly. Which is most often used in MP games.

[fathom aspen]

Duro excels at reading minds 😄

[thin stratus]

It's somewhat of a mystery to me in most cases what actually survives a (seamless)travel. Besides the obvious of course.

There is so much going in the Engine that I wouldn't be surprised if the LatentActionManager doesn't even care what world stuff is coming from

epic does some strange manual cleanup too

[honest rain]

I will do some digging again, thanks 🙂

[thin stratus]

I'm not gonna read your Persistent Data Compendium @fathom aspen

There can only be one Compendium

[fathom aspen]

Indeed, I'm used to widgets persisting seamless travels and seems like they've done something that makes them not

[fathom aspen]

[thin stratus]

The thing is, idk when that happened. Early UMG days, Widgets survived Hard Travels too.

Then some projects I had to hook into PreClientTravel to clean up the Widgets for SeamlessTravel

Cause otherwise you saw the Lobby UI on top of the rest if the Controller or whatever survived the travel.

And today i don't even know if that's still needed.

[fathom aspen]

What's cool is these things happen silently and catch us off guard when we upgrade XD

[thin stratus]

What caught me offguard is PlayerController not calling BeginPlay after a SeamlessTravel if its the same class.

[quasi tide]

Yuuuuuuuuuuuuuuuuuuuuuup

[thin stratus]

Who thought that's a good idea

[quasi tide]

That was a fun one

Epic likes these kinds of pranks

[thin stratus]

I'm half sure my Lobby Kit still has that bug cause I forgot to fix it

[fathom aspen]

Yeah that's super bizzare

[thin stratus]

I feel like the PlayerController should reset bHasBegunPlay or so

[unique ferry]

why does this not work in mp but works in sp 😦

[thin stratus]

Why do you reply to Air_Juan :D

And what kind of god forsaken code is that

[unique ferry]

because i watched some tutorials yesterday and i am putting my knowledge to the test

[thin stratus]

So

Let's start simple: What Actor is that code in?

[fathom aspen]

because i watched some tutorials
That's your problem

[unique ferry]

no actor

it's an empty bp

it's a spawning bp, i put it in the world to spawn things

[thin stratus]

https://tenor.com/br9fG.gif

[unique ferry]

did i mess that up already

[thin stratus]

BP_Airdrop has what kind of ParentClass?

[honest rain]

Character !

[thin stratus]

Now they start crossanswering questions

[unique ferry]

no class

[thin stratus]

I will go to bed if you continue this

[quasi tide]

Why are you multicasting a spawn?

[fathom aspen]

That's called telepathy

[quasi tide]

Just set the actor to replicate and spawn it on the server

[thin stratus]

That's impossible :P

[unique ferry]

class Actor!

[unique ferry]

i did, no work :9

[thin stratus]

OH, maybe it's an Actor then

So it's some random Actor in your scene

[quasi tide]

https://tenor.com/phk2.gif

[unique ferry]

ya

[thin stratus]

Right, then let's take your code apart

Since it's placed into the World, even if you would have not marked it as Replicated, it would call BeginPlay on everyone who is part of that World.
Which is usually every Player.

And with that info, the RPC from Client to Server is already redundant

Cause it already calls on the Server.

Now further, Client to Server RPC require the specific Client that calls the RPC to OWN the Actor.

An Actor placed into the Scene is not owned by any Client by default, so that RPC is dropped on any Client trying to call that.

So you basically made a glorified SwitchHasAuthority with that

And then, you go ahead and call a Multicast to spawn an Actor.

[honest rain]

how though ?

[thin stratus]

The Multicast is redundant due to BeginPlay already calling on everyone

And if the Actor you are spawning is marked as replicated, then it shouldn't even be spawned on Everyone, but just from the Server, so it naturally replicates down

[unique ferry]

this is like quantum physics to me

[thin stratus]

So that code picture is as wrong as it can be :D

[unique ferry]

i need to read this again

[thin stratus]

That's cause BeginPlay calls on everyone that this Actor exists on in theory.

That includes the Server

Put a print string into it and see for yourself

[unique ferry]

dropped as in ... activated? it's okay to call it to every client

[honest rain]

I see

[thin stratus]

Dropped as in "Never made it to the Server"

[unique ferry]

oh right

[thin stratus]

If all that BP should do is spawn a Replicated Actor

All you need to do is

BeginPlay -> SwitchHasAuthority -> OnAuthority -> SpawnActor

With the added requirement that said Actor you wish to spawn is marked as Replicated

[quasi tide]

Or drag it into the world and unmark the "Net Load On Client" option for a roundabout way of doing it 😈

[thin stratus]

Which brings us back to this:#multiplayer message

[unique ferry]

ok so... i did this

[thin stratus]

I imagine you would be sitting in a class room, and while the teacher takes a bit of extra time to explain something to one or more students, you shout random crap into the round to further confuse them. I can't blame you.

[unique ferry]

and ... some actors work (without the 'replicates' condition even being on)

some actors don't? (with or without the 'replicates' condition)

doesn't make much sense 😦

[thin stratus]

If "i did this" still refers to your code you posted, then idk what that actually all causes

[thin stratus]

Yeah that should spawn them on Server, and if they are marked as replicated, also on Clients eventually

[unique ferry]

this works/ doesn't work based on what bp i select

there are actors that i cannot seem to spawn

[thin stratus]

I mean, you are spawning with a scale of 55, 55, 55

[unique ferry]

i like it

[thin stratus]

Are you sure that's a good idea

[unique ferry]

yeah

it looks good in singleplayer

[thin stratus]

Does it spawn on the Server, or not at all?

[unique ferry]

it spawn on singleplayer (server?) but not on client

it's a simple bp i am trying to spawn with a mesh

i turned on replication on it but nothing spawns in mp

only in (server?) side

[thin stratus]

Singleplayer doesn't mean Server fwiw

[unique ferry]

on 'standalone'

it works

but on 'play as client'

doesn't 😦

[thin stratus]

So you have 3 settings:

Standalone
Listen Server
Client

[unique ferry]

yes

[thin stratus]

Standalone means every player is unconnected, their own game, no one is a server, no connection, nothing

Listen Server means there is a Client that counts as the Server (in the Editor that's the first player basically), and other Players are Clients

[unique ferry]

oooh i think this makes sense now

ok so it works in Listen Server

[thin stratus]

Client (or Play As Client) starts a Dedicated Server, and every player is a Client

[unique ferry]

now i assume i need to multicast?

[quasi tide]

No

[thin stratus]

The 3 nodes are all you need if the Actor is marked as replicated ( the one you spawn )

[unique ferry]

It is

[thin stratus]

Eh

That's a Component Setting

Not an Actor Setting

[unique ferry]

oh?

yes! this is on too

still nothing on client 😦

[thin stratus]

Can you place a PrintString into the BeginPlay of the Actor you are spawning?

[thin stratus]

And see what prints

[unique ferry]

okay

that's all

am I meant to get a client response? because for some reason it's not multicasting to clients

server knows about it, but client is not being told about it?

am i understanding this correctly?

[thin stratus]

You are in theory meant to get a Client Print

[unique ferry]

I did not get one

I guess that is my issue

[thin stratus]

What are your settings for Playing atm?

Play as Client still with 1 Player or so?

[unique ferry]

with 2

play as client with 2 clients, none receive anything, print string of actor spawned returns server response

[thin stratus]

How far away are your 2 Clients from the center of the map when they spawn?

Cause you are spawning at 0,0,0

And Actors have a NutCullDistance

They won't spawn if they are too far away

[unique ferry]

i can try spawning at player location maybe? brb

[thin stratus]

I would just put your spawner next to the player spawn

And do GetActorLocation

And connect that to the SpawnTransformLocation

So that Door doesn't spawn at 0,0,0

[unique ferry]

nothing 😦

players are quite close to centre of map anyways hence why server side looks okay

spawns maybe 20 m away

[thin stratus]

Are you not getting an Error for that code during run time?

[unique ferry]

no

why would i

[thin stratus]

There is no guarantee that the Player is there when the Server calls BeginPlay for that Actor

[unique ferry]

maybe because the project isn't so huge it loads up quickly

[thin stratus]

Just remove these

And put the spawner next to the Player spawns

[unique ferry]

done

nothing

may i just remind you that some bps work and some don't

so pretty sure it's to do with the settings on the actor i am trying to spawn, although replicates is on

so not sure what other settings could be impeding this to spawn in client only

very confusing error

😮

i think i found something

one of the actors i am trying to spawn has a set projectile speed, that speed, on server, is very slow, but on client, basically teleports the item to another dimension

if i put the speed at 0, it works, but very weird that it treats the same speed differently on client/server

do you have any idea why this is happening? 😦

[unique ferry]

Sorry if I said something wrong. Also may I mention that your website is not working

I was interested in seeing it but the contact us button doesnt work on my PC or mobile

[thin stratus]

You mean the SaltyPandaStudios one?

Works fine on my end

[unique ferry]

Yeah. I cant use the contact us button at all

[thin stratus]

Oh that one. That's strange.

Top right one works fwiw

[unique ferry]

Hard to spot on mobile, but got there in the end, thx

[thin stratus]

Yeah idk what broke the button on the LayerSlider. Seems like the plugin gave up.
It was set to link to the correct page but well. Hardcoded the url to the sub page now into it. Thanks for letting me know.

1. Plain Actors have no Interpolation/Smoothing. ReplicateMovement will literally just override the local Transform with the new one.

2. In theory, yes. It's mostly NPP that solves it, that is the backbone to Mover.

[molten matrix]

I thought I knew how to interpret the role/remoterole properties, but I just ran into something that does not match my understanding.

I have an object that can be interacted with by both client pawns and AI pawns. This "interaction" happens using a capsule overlap. When the pawn steps into the capsule, OnComponentBeginOverlap triggers and stuff happens.

When the player's pawn interacts with the object, OnComponentBeginOverlap triggers twice. Once on the client (object has role SimulatedProxy and pawn has role AutonomousProxy) and once on the server (object and pawn both have role Authority). This makes total sense to me.

When the AI pawn interacts with the object, OnComponentBeginOverlap only triggers once. It triggers on the server, which makes sense. The pawn has role Authority. However the thing that I don't get is that the object has role SimulatedProxy.

I was assuming that the role of all objects were Authority on the server, but it seems like that's not the case. And why does the role of the object change from Authority to SimulatedProxy depending on which pawn interacts with it?

Rubber ducking debugging at its best. I think I figured it out. It seems like the AI pawn only exists on the client side. So that's why the object's role is SimulatedProxy.

Now I just need to figure out why the pawn didn't spawn on the server, even though it ran inside an RPC targeted for the server...

[unique ferry]

if it runs in the controller then that is client side only

otherwise i'm not sure

[molten matrix]

I called a Server RPC from my cheat manager into my Game Instance subclass, and in that function I ran World->SpawnActor and that still seemed to create it on the client

That's very strange to me. According to @thin stratus 's compendium here https://cedric-neukirchen.net/docs/multiplayer-compendium/remote-procedure-calls if I do a Server RPC the only options (looking at the column marked "Server" in each of the table) are either "Runs on Server" or "Dropped".

So how come that even though my RPC is marked UFUNCTION(Reliable, Server) inside that method GetNetMode() returns NM_Client?

[sinful tree]

If your intention is to have a client call to the server to have it do something, you can only call server RPCs in client owned replicated actors. I don't think the cheat manager is replicated, and the game instance definitely isn't.

[mild lynx]

What would be the best way to handle Keeping track of Individual Score, and Replicating it to all players for a Scoreboard?

From what I understand, I am using the Gamemode to say what to do upon getting a point for a player. Should I store that score in that players PlayerState? Every tutorial I see handles the scoreboard part in Game State using a custom Struct but I'm a bit confused on how to pass these varriables down while keeping track of new Connections/Disconnections. Should the struct exist on both the GameMode and GameState?

Should the order be something like GameMode->PlayerState->GameState? or just GameMode->GameState? It just seems way easier to update a Score that is attached to PlayerState since it's easy to grab from a Controller

[kindred widget]

Depending on your necessity, PlayerState already has a Score property.

[mild lynx]

My concern with PlayerState is that Scoring and Stats may represent very different things depending on the game mode. Should I make a custom PlayerState per game mode?

[kindred widget]

Depends. If you have varying score types that you need to track, I would vote for a component on the playerstate that you can add at creation of it. Each GameMode should know how to handle the stats component it adds.

[fossil spoke]

PlayerState is the correct location for Score on a per Player basis

You can create PlayerStates for each differing GameMode if you need them to have different scoring states

[plush wave]

Setting a replicated variable direction on a Player State results in it not getting actually replicated right?

Doesn't the clients Player Controller need to make an RPC call that then changes the Player State?

[quasi tide]

It does. PlayerStates are replicated.

[mild lynx]

Okay, sweet. This helps a ton.

[plush wave]

Right, but I thought that the server owned player states. Making local changes to a Player State replicated variable on a client would not replicate up to the server I think.

I think an RPC call has to be made from the clien'ts player controller to then update something on the player state

[molten matrix]

This seems to be it. Moving it to the player controller fixes it. Just strange to me that it doesn’t match the table

[fossil spoke]

Only the server can cause variables to replicate

Therefore you need a Client to send an RPC to the server in order to cause a variable to replicate (after the server changes its value)

Changing the value on the Client only ever affects that Client

Clients cant cause other Clients variables to change

[torpid lantern]

How might I go about replicating the rotation of a directional light? I'm wanting the server to emulate day/night cycles. I don't see anywhere on the PIE DirectionalLight to replicate, nor are my RPCs working.

[plush wave]

Right, but what I want to confirm is if only the Player Controller is the mechanism from which a client can send an RPC to the server

[sinful tree]

The tables won't match as you're not working with replicated actors. Running a "Run On Server" event on an actor that only exists on the client will still execute, but only on the client as a replicated copy of it doesn't exist on the server.

Requirements and Caveats
There are a few requirements that need to be met for RPCs to be completely functional:

1. They must be called on Actors or a replicated Subobject (e.g. a component)
2. The Actor (and component) must be replicated

[quasi tide]

Only client owned actors can make ServerRPCs

So, your equipped sword could make an RPC to update the PlayerState for w/e reason

[plush wave]

How would the client have ownership of the sword? If it spawns it then it owns it but it is also only spawned locally.

[kindred widget]

You don't replicate the light so much. Usually in cases like this you'll have some sort of map actor, or a component on the gamestate. Something like that which will house your time of day. This value gets replicated, and you drive a myriad of things off of it such as directional light rotations, material collection parameters, etc. As there will likely end up being more than just a single light that needs updated via time of day.

[sinful tree]

You can set the ownership of a spawned actor on the server. Assigning the owner to a client owned actor or one of its components will then make that spawned actor also owned by that particular client- so after you spawned the sword you assigned the owner to a playerstate, a character, or the player controller, then that sword would be client owned.

[torpid lantern]

Thanks for the reply! I think my confusion was on the rotation control, but I just landed on a solution. I was trying to set rotation on the directional light source, but the correct play appears to be "AddActorLocalRotation". I like your idea about a central time actor though, will give that a tinker later.

[kindred widget]

Ah. Cause of pitch. Actually you'll have an easier time if you put your light in an actor, rotate it and use the actor's roll or yaw instead. It avoids the weirdness with pitch.

[molten matrix]

All makes sense now. Thanks for clarifying!

[torpid lantern]

Gah, now I'm stuck on my RPCs. What's off with my sequence here?

Triggered from client, on Player Controller.

Goal is to get both players to observe the shift in Directional Light source.
Result from my code is only initiating player observes change

[kindred widget]

Don't use RPCs. The light's direction is a state. Generally always replicate state.

[torpid lantern]

and use an OnRep notify from the state?

[kindred widget]

Yep, or tick whatever needs it.

[dark parcel]

I will use tick and interpolate since it won't update fast enough

[pallid mesa]

this bit is very interesting :)

[pallid mesa]

ye, something worth studying. I'm interested in eXi's conclusions in terms of bounding it with external systems, seems fun

[thin stratus]

We will probably not tie everything into NPP, but it becomes pretty quickly pretty clear that systems that affect each other all have to run through NPP.

Otherwise you get into the same problem that GAS + CMC + XYZ has

We will work around the non-NPP stuff in our project a bit, but it's less than ideal.

[pallid mesa]

lets see what this "better prediction methods" means in epic's GAS roadmap

[thin stratus]

Anything in their actual roadmap or based on those old comments they once made?

[pallid mesa]

no, its recent, from Jodon. From about a month ago

[sudden harbor]

Does blood VFX (decals) need to be replicated?

[short arrow]

You don't replicate effects, you tell clients to spawn effects through replication

For example if you wanted blood decal to appear on the floor after being hit by a sword, you'd call a multicast event named MC_BloodDecal. From that event you'd spawn the blood decal

[sudden harbor]

Ok, thank you.

[heady copper]

hhello guys

good morning

been trying to figure out whythis rpc is not working

i mean am checking if its a client or server before sending it it works on server but not client please help

[thin stratus]

Just fyi, you can just call the non ServerRPC in your ServerRPC again

No need to duplicate the code

[heady copper]

thanks ...am not used to blue print but ave taken notes

[thin stratus]

What is BPXController?

Is that a PlayerController?

[heady copper]

its the controller

[heady copper]

yes

[thin stratus]

What is "the controller" though? What is the Parent Class of that BP

[heady copper]

its a player controller

[thin stratus]

Okay, then the ServerRPC should function just fine. What makes you believe it's not working?

[heady copper]

when i move the mouse on the client the cue dosent move

[thin stratus]

Did you put a print string into the SetCueTargetDirection function as well as into the RPC (given you aren't reusing the SetCueTargetDirection atm) to see what calls?

[heady copper]

but it does on the server

[heady copper]

nope

[thin stratus]

Then please do that first

[heady copper]

ok thanks

[thin stratus]

You aren't calling anything locally, as you only RPC to the Server when you are the Client.
If you aren't replicating the Cue location back to the Clients, then it won't move for them.
And in theory you shouldn't do that anyway, cause then you introduce some latency to the Mouse moving the Cue.

You might want to call the Cue code locally too, to predict it.

I'm not sure what the requirements for your game are, so I can't give much more help then that.

[heady copper]

thanks

[neon summit]

when using p.showcorrections what is the white debug lines?

[patent moth]

Hello

[lost relic]

Im trying to get my VR character working in Multiplayer. And the biggest Issue Im facing is the player head and hand movement is not replicating to clients. so I changed My animbp run the setting positions of the hands and head from the RPC events, but nothing changed what am I doing wrong?

[sinful tree]

Animation blueprints don't replicate. It looks like you're trying to set replicated values on them / call RPCs on them, which won't work. Values that you want replicated usually should be contained on the replicated actor that is utilizing the animation blueprint. So if this is being used by a character, you'd replicate those values on the character and use them within the animation blueprint.

You shouldn't be multicasting something that is stateful. You have 3 values here whre you're setting something in a replicated variable. If your intention is to have this value replicate, then all you need to do is set these on the server ( again, not in the animation blueprint). If you want things to change after the new value is received, have those variables set as Rep w/ Notify, and then use the generated functions to call that additional logic.

[lost relic]

Thank for the reply Datura, So should I set transforms from the components in the character BP from tick and set them to replicated then pass those replicated transfroms to the animbp and not the actual refs for the component ?

Sounds like thats what your saying above. I will refactor.

[olive kraken]

Hey! questions about good practices. Is this the preferred way to get a local save file, in P2P when you are client?
Any other workflow to consider?

[sinful tree]

There is no P2P in Unreal. It's all client-server.
Save files are always local, so depending on where you're calling "Load Save From File" (either on a client or on the server) that determines what machine you're loading from, and the save will only be loaded locally.

[olive kraken]

Yeah, sorry, no p2p but client-server. In an scenario with a host and a client, when you want to load the local save file, is that BP from the PC one of the ways of doing it correctly?

[lusty palm]

smoothsync or gmc what is better?

[unique ferry]

Hello, I'm confused. Why is my item ' despawning' in multiplayer when too far?

It's not even that far, anything more than 20 000 units and it's gonzo

I noticed there is a setting called Cull Distance which seems to be just what I need, but it's already set to like 99999999

[solar stirrup]

Net Cull Distance Squared, so it's the square root that's the actual distance

If you want it to always be relevant, tick bAlwaysRelevant in the class defaults

[unique ferry]

yup, perfect, that was it, thank u

[white quartz]

I am wanting player 0 to always spawn at one player start and player 1 to always spawn at a different one. How would I go about doing that?

[graceful falcon]

@white quartz You could create a map and assign
Player 1 with the Player Start 1,
Player 2 with the Player Start 2.
etc

You could do in the GameMode blueprint.

You get all actors of class from the playerstarts and for the onpostlogin event you can assign for each player controller an index in the map.

[white quartz]

how do I assign them?

[graceful falcon]

@white quartz

[dark edge]

Local to who?

[sinful tree]

You can load a save game from any actor, what is important in multiplayer is if you're running that code on the server or on the client as some actors are replicated, meaning they exist on both the server and client. So what "local" is depends on what machine is currently executing the code.

Here's some examples to try and clarify:
I can have an instance of a player controller that is assigned to a client and it has a button input that will load the save file. If I press that input on that particular client then it's going to load the save on that client.

If I am a listen server, I have a copy of both my player controller, and a client's player controller, and they are both set up with those same inputs, but I also have seperate input that is hooked up to another function on the player controller called "Load Game" that executes the "Load Save Game From File". If I press the first input on the listen server's copy of the game, it'd be loading the save file on the listen server as it is using my player controller. Even still, let's say as the listen server I got a reference to the other client's player controller, and I called the "Load Game" function on it, it wouldn't do anything more than load the save file still on the listen server as I'm still executing on the listen server.

Now to complicate things further, let's say I had a "Run On Server" RPC called "Load Game Server" that then executes the "Load Save Game From File". I am on my client and press an input that executes "Load Game Server". The RPC would then call to the server, and the server then calls "Load Save Game From File" so then the file you'd be loading is on the server, even though the input started on the client, and the RPC exists on the client's player controller.

[white quartz]

ok, thank you

[olive kraken]

Thanks for the detailed explanation! So, if load the save file using an owning client event, does that mean that I'm always loading the save file of that specific local controller, correct?

[sinful tree]

If you'd be running that "Run On Owning Client" event from the server on a player controller or on the client that owns that player controller, yes.

[olive kraken]

Got it, and I imagine likewise casting to the game instance in a PC, wich is the client, will filter any other machine that is not that local machine.

Similar to local widets, etc, I suppose

I'm just trying to figure out the best place in UE Framework to call your own save files without accidentally call server one due to RPC

[white quartz]

how would I get all actors of class from the playerstarts? I thought that is something I would do in the gamemode blueprint.

[white quartz]

Found this solution on the forums, will try it and report back. https://forums.unrealengine.com/t/attaching-a-character-to-player-start-how/70545/2

[misty birch]

When I enable physics prediction in project settings my vehicle pawns refuse to move, I can't find any documentation on it. Basically theres a lot of input lag between the client and vehicle movement, if I make it client authorative then the client and server go out of sync even with reliable events to change the inputs.

[white quartz]

For some reason it appears that set player start tag does not work.

screenshot is from the forum post

[lost relic]

OK so I did what you suggested by creating the replicated values on the character and then passing those to the anim BP, playing as the listen server client 1 can see the movements, but playing as a client , client 2 does not see the movement

[lost relic]

As VR hand and head positions need to be constantly updated with tick to be 1-1 with the player for a good experience , and Now Im trying to replicate this for multiplayer and doing it on the server, the lag issue is becomming apparent and its not a good VR experiance waiting for the server to update the position of the lclient player hands and such, Also I can imagine this becomming a real issue with multiple vr players as thats a lot of network traffic being sent. So My question is how do I keep the client experiance fast and responsive and feeling like its done locally, but also show replicate the position for other players to see, running this on both the server and the client ?

[loud frost]

right side server and left side client , can you tell why that animation not working in client side

[thin stratus]

Possibly cause whatever drives the AnimBP isn't properly replicated

[thin stratus]

Set the VR Hand Transform locally, unreliable SERVER RPC that sets a RepNotify transform variable. Mark the variable as only replicating to SimProxy, and apply the transform to the VR hands in the OnRep.

You can optionally, in SimProxies, try to interpolate the VR Hands Transform between replication calls on Tick, cause OnRep won't call every frame.

[loud frost]

can you please explain more

i am actually using ALS plugin

[thin stratus]

Not really. I don't have that plugin. What I said is the only thing I can give you

[tardy fossil]

yeah thats how i handle my multiplayer VR. I sent an unreliable RPC every 0.05 seconds (20 fps) and just have the clients smooth it out

[vagrant grail]

Why is "OnSwapPlayerControllers" not being called when I switch from the Lobby Level to the Mansion level ?

[thin stratus]

Only called during SeamlessTravel fwiw

[vagrant grail]

My Gamemodes are set to "Use Seamless Travel"

[thin stratus]

And you tested outside Editor?

[vagrant grail]

I tried both "New Editor (PIE)" and "Standalone Game"

[thin stratus]

Are both GameModes using the same Controller class maybe?

[vagrant grail]

Nope, you can see in the screenshots above, the lobby is using PC_Lobby and the Mansion Level (GM_Playerground) is using PC_Playground

[thin stratus]

Then not sure. You might need to breakpoint in cpp

[vagrant grail]

I'm not touching any cpp, so how to do that please ?

[formal solar]

you are using 2 separate gamemodes

[vagrant grail]

yes ?

[thin stratus]

That shouldn't matter

[formal solar]

ok

[thin stratus]

If you don't know how to debug in c++ then that's a problem. Too much to explain

In theory if the PCs are different and the GameModes are set to Seamless travel and you test in standalone/packaged, it should call

[formal solar]

What setup are you using? Game mode only exists on server so you will only see that print string on server

[vagrant grail]

listen server (1 player creates the session and another client joins him)

[formal solar]

ah right well u should only see it on host

[vagrant grail]

it prints on none of them

[vagrant grail]

Tried using the same gamemode for both levels and the issue is still there 😬

[formal solar]

Not sure what it could be then, is it essential to use this node? There might be ways round it

[vagrant grail]

I don't know I just need an event to know when the player joined and is ready

[formal solar]

onpostlogin is a useful one in the gamemode, there are a lot of similar events inherited from game mode base (and I think some more only accessible in C++)

[vagrant grail]

I'm already using that in the parent gamemode and I don't want to execute the logic that's there a second time when changing level

[formal solar]

Just fyi there is a list of player states automatically collected by the game state
But game state does not load up straight away sometimes

You will have options, just can be hard to wrap your head around

[neon summit]

can anyone tell me what the white box means when I move my pawn?

it shows when using p.showcorrections. I'm sure its with replicting the movement but I don't see any info online of what the box means. It starts empty then fills up halfway diagonally and repeats and I get jittering when it restarts

[worn light]

i want to replicate mouse location to both on server and client but its not working can u guys tell me whats the problem

[formal solar]

There is a lot wrong here the first thing, what is 'mouse location'?

Show what your function does

[worn light]

ok

[formal solar]

Also, why is your 'run on server' event a multicast and not actually run on server?

[formal solar]

so it's where it hits something, that's fine

You have an event called 'Run on server' which is literally not set to 'Run on Server'

[worn light]

sorry i forgot to change it

will it work now

[formal solar]

no, you are setting variables wrong

You need to pass the vector in as a paremeter to the events
Think about it - I assume you are testing using 'play as client'? So dedicated server model?

[worn light]

play as a listen server and yes dedicated server model

[worn light]

ok

[formal solar]

listen server setup and dedicated server setup are different things

Unless you are extremely technically gifted with a lot of experience or have a big team/ a lot of money then you should do listen server model

[worn light]

no i using it for testing to see how things working on server and client my main motive is player will connect to dedicated server in game

[worn light]

im solo with 1.5 year exp and no money

[formal solar]

well regardless the main thing you are doing is not understanding how variables get communicated

Think about it - if you're on a random client and press 'left alt' and set the location vector - how does the server know about that?

[worn light]

i will have to tell server from that client

[formal solar]

Then when you do the 'run on server' event (pretending for a minute you actually run this on server), you grab the location variable to set the same location variable? But on server the location variable will be 0, because you never sent a message from the client telling the server what value it was, so you are just saying 0 = 0

[worn light]

oh hmm ah i see

so i have to use parameter in run on server event then set the variable and then do multicast?

ok it is working now , but from server to client not , i also need to ask that do i need to send the location from server to clients ? like its necessary?

[vagrant grail]

Tried "OnPostLogin" in my GM_Playground and it's not being called

[formal solar]

something like this

[worn light]

when u setting the varible with multicast will it not update it on both client and server?

[formal solar]

you can also set the variable to replicate

and just setting it on server will automatically change its values on all clients

[neon summit]

is it possible to smoothly replicate a pawn's movement in blueprints?

[worn light]

oh ok thanks i didnt knew about this

[formal solar]

character movement component is designed to handle replicated movement, you can tweak variables inside it to get the behaviour you want
it can be improved and optimised if you know what you are doing, i am not smart enough

[formal solar]

this is still wrong because you make the same mistake with your 'multicast' event

what are you multicasting?

[neon summit]

I know but I thought about using that but I'm wanting to use the floatingpawnmovement so I made a pawn. Unfortunately with floating pawn component doesn't work well. I'm just not sure about using character class for my spaceship

[formal solar]

you send a message from the server to clients, for each client to print to the player what the current 'location' value is.... on the client

[worn light]

the variable

[formal solar]

but you never told the client what the value was

[worn light]

client calculate value and then set it in first

[formal solar]

you are working in 2 player?

try testing in 3/4 player because it will clear up some confusion

[worn light]

ok

[formal solar]

you don't even need to set the value locally

basically all you need to do, when you get your line trace result, send that info to the server via a run on server event and in the server event, set a replicated variable

then all clients will see it

[worn light]

oops it didnt record those clients screens

[formal solar]

if you do a repnotify then you can attach a print string message to the variable being changed

[worn light]

ok

what is a difference between repnotify and replicated in variables

because if both are replicating then why they added same thing 2 times

[formal solar]

this dropbox is your best friend

Repnotify works slightly different in blueprint and C++

[worn light]

hmm also i need to learn all those replication conditions , because it doesnt show its description

[formal solar]

If you set it to repnotify then you get an 'onrep' function that calls on all clients when the variable changes, in this function you can do stuff like print the variable value

[worn light]

oh i see so it is for like notification or for telling system to that its done

[formal solar]

it notifies clients

when it changes

[worn light]

only clients i see

ok

[formal solar]

I'm not sure of the specifics

I think in C++, you must change repnotify variables on server

then server will know about it by default

in blueprint I think it is automatically handles to inform server + all connected clients from wherever it is called

[worn light]

i dont know c++ so i think im not going into that any soon

[formal solar]

I may be wrong, I just call them from server anyway

look at listen server testing because if you actually want to make a game or work on a small project that is most likely what you will be working with. Unless you are just curious, or maybe want to join a big team one day.

[worn light]

i writed ur code what u said above to do

[formal solar]

and the location is set to repnotify?

Look at the functions in your blueprints, you will have a new function called 'OnRepLocation'

Attach your print string to that, with location as input to the print string

[worn light]

yeah for now alone but i think any big team wont take me in untill i have ton of knowledge in blueprints and c++ and have some projects done

[formal solar]

Disconnect your 'multicast' event

[worn light]

nope its replicated only u can see it in the right corner panel

[formal solar]

Set it to repnotify

[worn light]

ok doing now sir

ok i got the function

what do i do with it now

[formal solar]

pull out a print string from your function and in the print string attach your location variable

then you can see how it works

[worn light]

like this

[formal solar]

if you are using listen server model I can give you my method of detecting when ALL players have joined (not just the first, you can't be sure of joining order)

[vagrant grail]

Yes please

[formal solar]

yeah

try that and see

[formal solar]

the crux of it is on the host you set the intended number of players in the host's game instance

[worn light]

it isnt printing anything

[vagrant grail]

Im' not sure to understand 🤔

[formal solar]

when you create a session

[formal solar]

disconnect the 'multicast' event

[worn light]

ok

[worn light]

then how do i gonna excute that formation

[formal solar]

You ask a beginner question and are now complicating the whole thing with some advanced code

[formal solar]

im trying to show you basics of repnotify

[formal solar]

This is what I do when I create a session as host

[raw thunder]

Hello everyone,
I am making an action RPG game and would like to have a login flow like so:
-Client logs in (I am using the CommonUser Subsystem)
-Client chooses a character save
-Client choose to host or browse to join a game with this character data (need to send to the server in case joining)

What is not destroyed during the connection process to keep this character data?

[worn light]

sorry i was just saying u said remove multicast so if i remove multicast which is doing the thing of to move these characters and replicating in all clients and server

[formal solar]

This is in my game state I have in the level I travel to (the 'is server' check might actually be redundant, but anyway the logic will only execute on host) to create a replicated variable in the game state that tells all players how many players we want

This is what I do in my game mode, essentially wait for a) the game state to be loaded and then b) All players to be logged in

'num players' is automatically update in the game mode as a class default

[worn light]

how do u getting each player controller ? like all controllers have 0 index so isnt It same controller of same player adding in ur array?

[formal solar]

controller index is different to index in an arbitrary array

[lost relic]

Thx. but what is this simproxy setting , All I see is this, I also like the sound of the latter better. but Multiplayer is totally a new thing to me soi Im getting a bit lost

If you could I would like to see how you did that, especially the smooting out part

[thin stratus]

"SimulatedOnly"

[lost relic]

thx

[thin stratus]

The Smoothing part is basically just having some StartValue and a TargetValue.

TargetValue is whatever newly got replicated, StartValue is the previous CurrentValue.

If you do it FixedTime, like b2soft says, you would need to track the time since the last replication happend and divide that by the FixedTimeMs to get an alpha from 0 to 1.

[lost relic]

just one more thing. so I have the full understanding , doing it like this is basically updating the server position of the hand transfrom from the local ?

[thin stratus]

or fwiw, you can also just get the Difference between "TargetValue" and whatever "CurrentValue" is and move x% from A to per Frame. There are a bunch of options.

[thin stratus]

You are mixing stuff up a bit.

[lost relic]

what I did or my understanding?

[thin stratus]

You shouldn't be setting a RepNotify Variable inside an OnRep function

[vagrant grail]

Why this doesn't disable players movement ?

[thin stratus]

The idea is that the Client tells the Server, via RPC, what the expected WorldTransform is.

[lost relic]

ok I read it as such. so just leave it empty then ?

[thin stratus]

The Server uses the Transform Input of the ServerRPC to set a RepNotify variable that is limited to Simulated only.

And then in the OnRep yo use that variable to set the Transform of the Hand.

[thin stratus]

Maybe your PlayerMovement isn't utilizing those MoveIgnore stuff?

[vagrant grail]

what do you mean ? Like the print is being called in the OnRep function

[lost relic]

I had to set that to allow roomscale movement

[thin stratus]

Are you using Characters?

[lost relic]

yes

[thin stratus]

That wasn't directed at you

[vagrant grail]

yes BP_ThirdPersonCharacter

[thin stratus]

Then it should work fine

APawn uses it to block the AddMovementInput call locally already

You should confirm that the boolean in that struct are actually correct

And maybe print IsMoveInputIgnored on tick in your PlayerController to see if that actually is changed properly

[vagrant grail]

They are

[vagrant grail]

for some reason it prints true and false at the same time 🤔

[thin stratus]

If ithat's in the PC, then that's normal

One Server is the Server's PC

The other is the Client's PC

Not sure then, the value is used in AddMovementInput

[vagrant grail]

but why are they not synced ? 🤔

[thin stratus]

void APawn::Internal_AddMovementInput(FVector WorldAccel, bool bForce /*=false*/)
{
    if (bForce || !IsMoveInputIgnored())
    {
        ControlInputVector += WorldAccel;
    }
}

[thin stratus]

Your prints show they are fine

At leas the struct is fwiw

But it's a local thing, so it doesn't matter if the Server's Version of the Client's PC has it wrong

[vagrant grail]

wait a minute, I have nothing in my BP_ThirdPersonCharacter for some reason (beside stuff related to GAS that I was testing before) 🤔

Maybe it's because all of that stuff is in the c++ class I guess

[vagrant grail]

I don't have the same thing as you for some reason 🤔

Oh that's because what you shown was in "Pawn" which is what's inheriting my PlaygroundCharacter.cpp

[vagrant grail]

Then I have no idea of why it doesn't work

[unique ferry]

so... ai controllers can't call server rpcs?

[raw thunder]

AIs are already on the server, why would you need to call a server RPC?

[unique ferry]

i don't know for some reason my interface event is not calling on mp but is on sp

[prisma belfry]

Quick question: When running game from editor as listen server, there seems to be two GameInstances correct? but only one asset manager?

[modest crater]

Just looking into AdaptiveNetUpdateFrequency here and wanted to confirm something.

Does this mean I am going to need to be extra attentive to each actor that is replicating and ensure propper values, for example my ACharcter inherited class has these as default, which 2 times a second or .5s per update in its worst case seems kinda low, even for a worst case, am I correct in this assumption?

[thin stratus]

That could totally be, unless you change it to not run under one process

[prisma belfry]

yeah I've confirmed there are the two game instances at least

[hoary spear]

Gotta show some code

Interfaces dont discriminate

[formal solar]

yeah its really important to look at update frequency of your most used/most important actors

[pearl walrus]

Anyone able to help me figure out what needs replication?I I read the documentation but I made my Lobby UI and menus without replication in mind so now I need to go back and properly apply it

[formal solar]

you want to call server RPCs from the player controller that clicks stuff @pearl walrus

dont try to call server RPCs from inside widgets

[pearl walrus]

Hmm so do I just apply it to all my custom events or variables in my playercontroller?

[raw thunder]

Hello everyone,
Is it possible to join a session without loosing client data? (Maybe no map travel?)

Let me explain what I would like to do:
-A client selects his character from different save files (locally).
-He can join friends from his friend list or host his own server.
-When he joins a server he keeps all his choices (eg. character selection) and the group is displayed on his screen (With each player's custom characters) he also RPCs to the server his choices.
-He can still invite friends to the group etc.
-Then the server can launch the game and load the map when everyone is ready (Or everyone launches the game separately, not sure about this part (late joining)).

I struggle with the part where the client joins the server, when I do that a new map is loaded and the client is fully initialized (GameMode spawns the PlayerController, PlayerState etc) and I loose the client datas, only GameInstance is kept.

I currently use the Common Session Subsystem to create, host and join sessions.

[sinful tree]

Whenever you connect to a server it's going to be a hard travel using Unreal's networking system, which means you will always lose basically all loaded info except for what you have stored in the GameInstance, and of course, save games.

So if you have choices you want a client to make before they join a server, you'd need to set up a system to store those choices in the GameInstance, and after connecting (ie. after Begin Play on their player controller fires on their local machine) read those values from the GameInstance, use them locally or send an RPC with the data of those choices so the server can then use and replicate those values to everyone else.

[thin stratus]

You could use Beacons

They are a lightweight connection that doesn't actively join the Server's map

Requires C++ though iirc

#online-subsystems message

This guy posted some stuff about it quite a while ago

[raw thunder]

Ok, this is what I was thinking... Thank you for the answer

[raw thunder]

I'll take a look, this seems promising!

Thank you

I recently played "Tribes of Midgard" (made with UE) and the lobby is quite nice. When joining a group you don't have a loading screen or what ever.

[thin stratus]

You will ultimately have to travel when you want to play

But for the initial connection, beacons would be enough

It's a bit like those "Main Menu Parties" of most competitive games

[idle tundra]

Hey, is someone here familiar with the ALS-refactor plugin for Unreal, I have a problem with syncing it when using custom networking.

[raw thunder]

Yes right, that was what I was looking for

[quasi tide]

1. Don't cross post. See #rules 7
2. Don't ask if anyone knows, just ask your question
3. No, I don't know the plugin

[idle tundra]

Didn't know where to post it man, I am new here chill

[quasi tide]

I am chill though

[vagrant grail]

Anyone please ? ☝️

[thin stratus]

They are right though. If you are new you should especially know the rules.
And if you have a question, simply post it instead of asking to ask (:

[idle tundra]

Okay, thanks for clarifying (:

[quasi tide]

What was clarified? 🤔

[icy jetty]

The clarification

[lost relic]

So I had another crack at it and nothing seems to have changed so Asking If I did this correctly , First i set the onrep value from the RPC SERVER event , pic:1, then in the onrep function I set another value I created which is now being used by the anim BP for the hand position Pic:2 then in the ANIMATION BP im using that transfrom to position the IK hand, pic:3 not sure what I missed

[thin stratus]

That you were right (:

So, what actually moves your hands? The Actors World Location or the AnimBP?
I assume the Actors World Location, cause that's the one you are getting.

Your ServerRPC needs a Transform Parameter. You Client needs to set that with the Actor Transform of the Hand. You can't get the Transform like this on the Server, cause then that's no the Client's Version.

And for the second variable, that seems largely redundant if you aleady have a transform variable you can use.

[modest crater]

Does BP graph do ANY sort of compression or packing behind the scenes? Networking in BP seems expensive

[thin stratus]

And then you put the two GetWorldTransform calls where you call that RPC

[lost relic]

a control rig is using the hand transfroms im sending to the animbp to do IK arms

[modest crater]

Like do you need scale if so that could already save on 12bytes an not do a transform

[thin stratus]

If all you need is the Value, then you can change the Transform var to be a normal Replicated one fwiw.

[modest crater]

I know you are debugging or figuring it out but Im just saying

actually its 24 isnt it since theyre doubles 8*4 = 24

[lost relic]

I just need to send the head , and both hands transforms the the animation bp , the control right does the rest

[thin stratus]

In theory what your code needs to do is:

EventTick -> IsLocallyControlled -> Branch -> True -> SetTransformVariables -> ServerRPC_SetTransformVariables(TransformVariables)

ServerRPC_SetTransformVariables -> SetTransformVariables

And then use the TransformVariables (which are the two you have) in your AnimBP

And the TransformVariables would be Replicated->SimulatedOnly, cause the owning Client and the Server are setting them manually, they only need to replicate to the Simulated Proxies.

There are multiple ways to solve this overall

The time between updates will probably not be .2 second for the SimProxy.

So just going from A to B in .2 seconds is probably not going to work here (that's what I suggested first).

It could be that updates come in faster or slower than .2.
I think if A was "normal", and B was "late" and C was "normal" again, you'd need to extrapolate until B arrives, yeah

I can't type :D

[lost relic]

Thanks seems to be moving in client now to , But I have hand position lag 😦 and im getting other issues now where my character works as normal on as listen server, but in client if the values are set to simulated only, my character mesh is stuck at world origin on the player , but looks ok on the client. turning of simulated seems to correct it but its not working with roomscale and charactero is no moving with me , only mesh., I dont expect yuo to know why any of this is happening, but thought I would mention it

[thin stratus]

Did you also set the Transform Variables locally before calling the RPC when you have the Variables set to SimOnly?

Otherwise your LocalClient will have 0,0,0 in them

[lost relic]

no

[thin stratus]

EventTick -> IsLocallyControlled -> Branch -> True -> SetTransformVariables -> ServerRPC_SetTransformVariables(TransformVariables)

[lost relic]

ok ty

[lost relic]

so I should set them outside and pass them in?

[thin stratus]

You can fwiw set them before calling the RPC and use them as inputs

You still need to set them inside of course

Cause that's the Server-side

[lost relic]

ok , this is kinda confusing

[thin stratus]

Why

[lost relic]

I get it , but without theis help I doubt I would have

[thin stratus]

These variables have default values if you don't set them.
The Server sets them in the ServerRPC.
The SimulatedProxies get the values replicated.

The Local Client, in your current setup, never sets the variables.

And we want to set them locally instead of including the local client in the replicated setup, because otherwise the local client would have a delay

Cause the local client would then tell the Server about the values and wait for them to replicate back to it, which is one full RoundTripTime.

Instead, set them by hand locally before calling the RPC

Or fwiw after calling the RPC, it doesn't really matter

[bright summit]

swapped null online subsystem for steam one, trying to test on 2 differenet accs, 2 different pcs and it can't find session. Any ideas?

[thin stratus]

Custom AppID?

[bright summit]

no, 480

[thin stratus]

Both Accounts properly show that they are playing Spacewars?

[bright summit]

yeah

[thin stratus]

Both properly have the Steam Overlay show up?

[bright summit]

yes

[thin stratus]

Are they friends?

[bright summit]

yes

[lost relic]

seems better thx .

[thin stratus]

How many results do you allow on the FindSessions node? @bright summit

[thin stratus]

Try 100

Steam will return you 10 results for Spacewars, not 10 results for your specific UE game

It can always be that the 10 results are from other GameDevs, which might all be filtered when trying to parse on UE's end

[bright summit]

ok, sometimes it was showing weird results, but I will try

[thin stratus]

Other than that, I would suggest you enable some logs and read your logs.

You could enable LogOnlineSession LogOnline LogOnlineServices

[bright summit]

where to do this? in .ini file?

[thin stratus]

And fwiw, check if you are using the older SteamNetDriver or the newer SteamSockets stuff

[thin stratus]

Could do that in an ini file, or via console in the running game

log LogCategory VeryVerbose

I don't know where to place it into the ini, so can only give you the console command above

[lost relic]

Just thought I would share My improvment , I used my original system as the local first, then passed there values to the Serverside RPC_ Neater and solves other issues I was having . still have a some hand Lag which I dont know why

[bright summit]

it should log to file or console? if file where can I foind it? Saved/Logs ?

[thin stratus]

Yes

[bright summit]

I don;t know if my .ini configuration looks right

[/Script/Engine.GameEngine]
+NetDriverDefinitions=(DefName="GameNetDriver",DriverClassName="OnlineSubsystemSteam.SteamNetDriver",DriverClassNameFallback="OnlineSubsystemUtils.IpNetDriver")

[OnlineSubsystem]
DefaultPlatformService=Steam

[OnlineSubsystemSteam]
bEnabled=true
SteamDevAppId=480

; If using Sessions
bInitServerOnClient=true

[/Script/OnlineSubsystemSteam.SteamNetDriver]
NetConnectionClassName="OnlineSubsystemSteam.SteamNetConnection"```

[2024.04.14-17.56.50:231][431]LogOnline: VeryVerbose: OSS: FOnlineAsyncTaskManager::AddToOutQueue [FOnlineAsyncEventSteamRichPresenceUpdate got new information about user 76561199143269563]
[2024.04.14-17.56.55:068][114]LogOnline: Verbose: STEAM: FOnlineAsyncEventSteamRichPresenceUpdate got new information about user 76561199143269563
[2024.04.14-17.56.55:068][114]LogOnline: VeryVerbose: OSS: FOnlineAsyncTaskManager::AddToOutQueue [FOnlineAsyncEventSteamRichPresenceUpdate got new information about user 76561199143269563]
[2024.04.14-17.56.58:117][157]LogBlueprintUserMessages: [WB_MainMenu_C_2147482470] Join Game
[2024.04.14-17.57.05:335][654]LogOnline: Verbose: STEAM: FOnlineAsyncEventSteamRichPresenceUpdate got new information about user 76561199143269563
[2024.04.14-17.57.05:335][654]LogOnline: VeryVerbose: OSS: FOnlineAsyncTaskManager::AddToOutQueue [FOnlineAsyncEventSteamRichPresenceUpdate got new information about user 76561199143269563]
[2024.04.14-17.57.07:838][522]LogOnline: VeryVerbose: OSS: FOnlineAsyncTaskManager::AddToInQueue [FOnlineAsyncTaskSteamFindLobbiesForFindSessions bWasSuccessful: 0 NumResults: -842150451]
[2024.04.14-17.57.07:840][523]LogOnline: VeryVerbose: OSS: FOnlineAsyncTaskManager::GameTick Starting serial task [FOnlineAsyncTaskSteamFindLobbiesForFindSessions bWasSuccessful: 0 NumResults: -842150451]
[2024.04.14-17.57.07:840][523]LogOnlineSession: Verbose: STEAM: Starting search for Internet games...
[2024.04.14-17.57.07:840][523]LogOnlineSession: Warning: STEAM: Unable to set search parameter LOBBYSEARCH: Value=true : Equals : -1
[2024.04.14-17.57.08:169][637]LogOnline: Verbose: OSS: Async task 'FOnlineAsyncTaskSteamFindLobbiesForFindSessions bWasSuccessful: 1 NumResults: 0' succeeded in 0.330600 seconds
[2024.04.14-17.57.08:169][637]LogOnline: VeryVerbose: OSS: FOnlineAsyncTaskManager::AddToOutQueue [FOnlineAsyncTaskSteamFindLobbiesForFindSessions bWasSuccessful: 1 NumResults: 0]
[2024.04.14-17.57.08:169][637]LogOnlineSession: STEAM: Found 0 lobbies, finalizing the search
[2024.04.14-17.57.08:169][637]LogOnline: VeryVerbose: OSS: FOnlineAsyncTaskManager::AddToInQueue [FOnlineAsyncTaskSteamFindServers bWasSuccessful: 0 Results: 0]
[2024.04.14-17.57.08:169][637]LogOnline: VeryVerbose: OSS: FOnlineAsyncTaskManager::GameTick Starting serial task [FOnlineAsyncTaskSteamFindServers bWasSuccessful: 0 Results: 0]
[2024.04.14-17.57.08:169][637]LogOnlineSession: Verbose: STEAM:  "gamedir" "unrealtest" 
[2024.04.14-17.57.09:047][943]LogOnlineSession: Warning: STEAM: Server response IP:15.removed - 
[2024.04.14-17.57.09:047][943]LogOnlineSession: Warning: STEAM: Removed incompatible build: ServerBuildUniqueId = 0x00000000, GetBuildUniqueId() = 0x01a22caa
[2024.04.14-17.57.09:047][943]LogOnlineSession: Verbose: STEAM: Server query complete '0' eServerResponded (Server success)
[2024.04.14-17.57.09:047][943]LogOnline: Verbose: OSS: Async task 'FOnlineAsyncTaskSteamFindServers bWasSuccessful: 1 Results: 0' succeeded in 0.878459 seconds
[2024.04.14-17.57.09:047][943]LogOnline: VeryVerbose: OSS: FOnlineAsyncTaskManager::AddToOutQueue [FOnlineAsyncTaskSteamFindServers bWasSuccessful: 1 Results: 0]
[2024.04.14-17.57.09:048][943]LogBlueprintUserMessages: [WB_JoinGame_C_2147482464] Finished searching for servers``` logs

I removed IP of found session

[short arrow]

It's worth noting that App ID 480 (spacewars) is region locked

[bright summit]

It's same region...

[thin stratus]

[2024.04.14-17.57.09:047][943]LogOnlineSession: Warning: STEAM: Removed incompatible build: ServerBuildUniqueId = 0x00000000, GetBuildUniqueId() = 0x01a22caa

That might also point to both games not using the same build

The Search itself seems successful

[short arrow]

By region I mean server locked in steams case. US - Los angels steam server cannot find servers in US - Carson city

There's no US - Carson city steam server but im just making an example

Both are in the same region, but are a different steam serve connection or whatever

[thin stratus]

I mean it reads like they just test on 2 PCs

Not even with a different person idk

So region shouldn't be an issue

[bright summit]

I am testing in 2 other PCs in same network

[short arrow]

Are both being launched through the packaged game? You cannot connect through unreal unless you are using unreal source

[bright summit]

I copied the same build to the other pc, it is impossible

yes it's packaged

[thin stratus]

Hm, very strange. You could try using SteamSockets instead of the older SteamNetDriver fwiw