multiplayer

[kindred widget]

That sounds like something you would maybe store locally on the client and pass through an RPC during login.

There's an async login thing that allows you to delay logins for a short time. So you can RPC the client, tell them they're logging in, send an RPC back with the picked data which finalizes the login.

[velvet jacinth]

Is there an updated article/guide for UE 5.4 about ReplicationGraph?
All I can find on the web or Youtube are deprecated lines of code in the ReplicationGraph class that doesn't exists anymore.

[kindred widget]

AFAIK Iris was supposed to be an intended replacement for the replication graph.

[maiden flame]

If you are using a dedicated server, you can try adding `[PacketHandlerComponents]

+Components=OnlineSubsystemSteam.SteamAuthComponentModuleInterface` to your project's DefaultEngine.ini

[thin stratus]

If you have C++ available to you, youc an simply use the Player Options String. There is a function on the ULocalPlayer class you can inherit from that creates the option string. That's also how the ?name= one is passed. That string is then Available in the Login functions of the GameMode and can be used to set it on the PlayerController, and then from the PlayerController can be used in the GameMode's GetDefaultPawnClassForPlayer function (might be called slightly different).

BP only you are locked to keeping it local and sending it via a Server RPC after connecting.

[rustic sable]

tha would be really cool, I was trying to pass in a string like this to open level FString::Printf(TEXT("%s:%d?CharacterIndex=%d"), *SelectedServer.Address, SelectedServer.Port, CharacterIndex);

but I really have not idea how to implement this or retrieve it when it comes back

looks like in PostLogin(APlayerController* NewPlayer) the player should return the options with GetOptions? I'm not seeing this tho

[verbal ice]

PreLogin and Login both have the Options string

[kindred widget]

There are functions for it. And you should pass the option as "CharacterIndex=17" There is a function called GetIntOption in GameplayStatics that will pull the 17 for you if you give it CharacterIndex

[prisma storm]

Hey, I have a question about multiplayer regarding data serialization between Client and Server. I know that JSON is not very efficient in terms of speed, and I’ve tried Flatbuffers, but I found there’s an issue with validation when using multiple schemas, as if everything has to be in one schema. So I was wondering, how do you handle data serialization between Client and Server?

[kindred widget]

For what use case?

[rustic sable]

        FString ServerString = SelectedServer.Address + TEXT(":") +     FString::FromInt(SelectedServer.Port);
        FString Options = FString::Printf(TEXT("?CharacterIndex=%d"), CharacterIndex);

        FString FullServerString = ServerString + Options;
        FName ServerAddress(*FullServerString);
            
        UE_LOG(LogTemp, Warning, TEXT("Joining %s"),*FullServerString);
        
        UGameplayStatics::OpenLevel(GetWorld(), ServerAddress, true);

I'm still on the passing it in part, so when I open the level it would be like this>/

[kindred widget]

That looks correct at a glance.

Open Level though? This doesn't seem like you're joining a server as much as hosting one?

[rustic sable]

is that not the one to use?

I mean it does work when joining a host but I just came across that server travel is another option

[prisma storm]

For movement, when using the UDP/TCP protocols.

but also other information such as the attack system, as I don't use the Unreal Engine network system.

[rustic sable]

I mean I'm opening connection to a remote host from a login widget so not sure if open level or server travel is more appropriate

[shrewd ginkgo]

In the stabbing event everything works properly and the simulate physics in onrep healt works but the UI show death menu in the same place does not work.

UI show death menu also works if I use this dmg actor

and players other than the server can't run the kill event.

[verbal ice]

You'd probably wanna use UKismetSystemLibrary::ExecuteConsoleCommand()

[rustic sable]

for connecting to a remote host in a packaged build?

[verbal ice]

Then you execute open YourFullUrlWithOptions

yes

Technically you can just do GEngine->Exec(World, "open ..."); but Exec functions can be stripped out in a shipping build if you change defines

The ExecuteConsoleCommand() function handles that scenario

[rustic sable]

ok I'm getting confused in order to get retrieve the options I heard
GameModeBase::Login(UPlayer* NewPlayer, ENetRole InRemoteRole, const FString& Portal, const FString& Options, const FUniqueNetIdRepl& UniqueId, FString& ErrorMessage)

GetIntOption in GameplayStatics

now this 😅

[verbal ice]

Okay so, I'm confused as well

What are you trying to do exactly?

[verbal ice]

My messages were related to this

You wanna use ExecuteConsoleCommand not OpenLevel

[rustic sable]

ah ok

[verbal ice]

(okay I checked OpenLevel should work as well but it's confusing)

[rustic sable]

connect to a remote host and pass along an index, so the server knows which character the player wants

[verbal ice]

Okay so pass it as an option when connecting to the server, then retrieve that options in PreLogin or Login

[graceful flame]

Some games allow console, are they packaged using Testing configuration instead of Shipping?

[lost inlet]

Shipping but allowing the console

[graceful flame]

how?

[verbal ice]

ALLOW_CONSOLE_IN_SHIPPING=1 in their definitions

[graceful flame]

oh

[lost inlet]

Requires source build too

[graceful flame]

thanks!

[verbal ice]

That's exactly what you wanna do yea

should work fine

[rustic sable]

ok let me give it a shot

[jade scroll]

i set in my character when i create widget and add to viewport

i set the variable character in my widget

all works fine in first seconds... after a few for some reason the variable is not valid anymore -.-

how is this possible

sometimes it works correctly....

sometimes after few seconds the variable is not valid anymore -.-

[lost inlet]

how are people still using UMG bindings

the secret perf killer

[rustic sable]

    FString Options = GetWorld()->GetMapName(); 
    int32 RetrievedIndex = UGameplayStatics::GetIntOption(Options, TEXT("CharacterIndex"), -1); 
    ```
how would I get this after connecting to the server, I'm getting the default

[lost inlet]

how does this snippet make sense?

[rustic sable]

its from a previous ongoing conversation

[lost inlet]

the args passed in the URL are in AGameModeBase::Login

[verbal ice]

You use the Options in PreLogin or Login

On the server side

If you need clients to have access to that, just replicate it afterwards

[rustic sable]

nope server is fine since that what is going to use it

so don't get it from the GetMapName then?

[lost inlet]

no?

[verbal ice]

No

[rustic sable]

k

[lost inlet]

GetMapName has no context about the joining player

virtual APlayerController* Login(UPlayer* NewPlayer, ENetRole InRemoteRole, const FString& Portal, const FString& Options, const FUniqueNetIdRepl& UniqueId, FString& ErrorMessage);

It really is right there. Options

[rustic sable]

why does this return a pc at the end, what the point of it?

[verbal ice]

It's the PC that was spawned for the player

[lost inlet]

because this spawns the player controller

[lament flax]

the ROOT of the player that joind is the PC

[lost inlet]

you can see what it does by opening GameModeBase.cpp

[lament flax]

from the PC you got the pawn, PS, etc

[rustic sable]

well yes, I know that last bit, just didnt know the login actually spawned the pc, interesting

[rustic sable]

ok weird question but what has authority before you connect to a host 😅

Like I launch my client which at first is just a level with a widget that retrieves the game servers, at this point is there anything that has authority? One you connect to a host it then it all falls into place but before that it's basically a single player game?

[verbal ice]

The local client is the authority

Same as a singleplayer game

[rustic sable]

yeah makes sense, like when testing as a local client something is handling the authoritative side but I wasn't sure about the diistinction, becuase when you actually connect to a dedicated server alot of things behave differently and it caught me off guard a few times

I guess editor does its best

[rustic sable]

what do I need to do to multicast a material parameter? currently trying it like this to set it on all the replicated components but it's not picking up

I have one dynamic material where I actually need to change textures, the rest are just instances likt the body color

[verbal ice]

Don't use multicasts

Use a replicated property and a rep notify

[rustic sable]

so like just a bunch of on rep floats that set the param?

[dark edge]

one

skincolor is one float

when it changes (onrep), apply it to the material instances

[rustic sable]

yup

I have other properties too but i get the idea

[dark parcel]

I guess you can use struct if you have multiple properties

but using multicast deffinitly not the way to do it

[vocal merlin]

Hello, wondering if anyone can help with a movement desync issue I'm dealing with.

In my game if you walk into an enemy AI, sometimes it causes player movement desyncs which show with p.NetShowCorrections 1. It makes the movement very stuttery. I'm not sure what I need to do in order to fix this. Has anyone ever dealt with this before?

[short arrow]

Sounds like your AI only has collision on either the server but not clients or vice versa

[vocal merlin]

It does have collision on client and server. The bug doesn't always happen but it happens often enough

[thin stratus]

Is the AI standing or moving?

If it's moving it's somewhat expected to cause corrections. The client predicts movement but the AI they collide with is slightly behind. And on the server the AI already moved further. There isn't really a way to fix this, even with forward prediction, which I don't think exists for the CMC, you will get these corrections. Keep the ping low and it shouldn't be too noticeable

[shrewd ginkgo]

In the stabbing event everything works properly and the simulate physics in onrep healt works but the UI show death menu in the same place does not work.

UI show death menu also works if I use this dmg actor

and players other than the server can't run the kill event.

[vocal merlin]

AI moves yes. I've seen minor corrections happen on Lyra, but it seems to fix itself after a second. In my game, if I continue to walk, my movement keeps stuttering and correcting until I completely stop.

[twin juniper]

I'm having an issue with my replicated flamethrower. It works fine when two players are facing each other and shooting. However, if one player is not looking directly at the other player (meaning they can't see the Player Character itself) but they can still see the flames from the flamethrower, The rotation of the Niagara Component for these flames doesn't seem to update (they aren't rotating correctly for the other player), which is confusing me. Any help would be appreciated!

[twin juniper]

The component I'm using is a UNiagaraComponent. I have a theory that there might be some performance optimizations enabled under the hood that could be affecting its behavior. Disabling some of these optimizations might help resolve the issue with the flames not rotating correctly when players aren't directly facing each other. I would appreciate any guidance or assistance on this matter.

[next belfry]

What happens if an Actor that is being replicated from the server, has a hard-referenced and unloaded asset inside it, does unreal engine streamer will load it automatically?

[verbal ice]

Yes

[next belfry]

Thank you, also does actor creation on client side wait for all hard-references asset to load before spawning them?

[queen escarp]

how would i add a delay in the loop body ?

like 1 sec before going to next etc.etc ?

[next belfry]

I would use set timer without for each loop

[queen escarp]

hmm

thats true

[verbal ice]

Not sure. It might do a blocking load or async load and wait for the references to be there

But AFAIK it won't be on the client without all of its hard references being ready

[next belfry]

alright will keep this in mind, Thanks!!

[heavy trench]

Apologies for the vague question, but I have recently been getting a warning when spawning a client instance in PIE (Listen Server, 2 Players) where I am receiving the warning:

LogNet: Warning: UNetDriver::ProcessRemoteFunction: No owning connection for actor BP_GASCourse_PlayerCharacter_ElfMale_C_1. Function Handle Gait will not be processed.

This seems fairly new so I don't know what I did to introduce this. This warning is coming from the character class BP_GASCourse_PlayerCharacter_ElfMale. I am not sure what I did to cause this warning to appear, or if I had just been blind to it and now only realizing its there. Any help would be appreciated, thanks!

[lament flax]

In the pins check for the multiplayer compendium and go to the "Ownership" page

This will help you what the warning is telling you

Short answer:
you cant call a Server RPC on client side if the client doesn't have a owning connection (the PC is the root of that owning connection , its used by the Pawn and PS)

[burnt coral]

Is it necessary to put the:

bReplicates = true;

or should I just do this to the blueprint version of the object?

[rose pollen]

has anyone done performance benchmarks of mover 2.0 vs the cmc? does it do simple things like handle sprinting just via movement speed changes out of the box?

[fossil spoke]

Either is fine.

[fossil spoke]

Mover2.0 is bare bones, you have to build it up (and work through many bugs) to get the features you want.

CMC is prebuilt with many many features which you might not utilize.

Mover is more performant but less reliable.

CMC is less performant, more reliable.

[rose pollen]

got it, i am really using only very basic things, walk, jump, and sprint. the only changes to the default CMC that i need are predicted sprinting really so there isn't a ton for me to have to build, but dealing with bugs at that layer is super time consuming so maybe not worth

hmm, also GAS play montage and wait type stuff

[fossil spoke]

GAS does not integrate well with either the CMC or Mover, since all 3 have their own prediction...

Which makes it a pain in the butt

[rose pollen]

yes lol

can the net prediction plugin be used as an intermiedairy to resolve that or not really?

[fossil spoke]

Mover uses NPP i believe

So no

All of them would need to move to NPP to work together properly

Which is unlikely to happen anytime soon.

Maybe UE6 😛

[rose pollen]

lol

[fossil spoke]

Whats more likely is GAS moves to NPP and the CMC gets supercedded by Mover.

But even then, its not a small task.

[rose pollen]

probably most practical to just work with CMC for the time being for me then, but i have stamina and sprinting and really would greatly prefer gas to handle the stamina and its a pain

[fossil spoke]

If you are planning to release your game within the next few years, then I would stick with CMC.

[rose pollen]

gas + mover both with NPP sounds awesome

[fossil spoke]

Thats pure speculation BTW

Wishful thinking even

[twin juniper]

Anyone would know about this problem?

[rose pollen]

i vaguely remember there is a setting like "run simulation even when culled" or somethign roughly like that but i can't find it offhand

[twin juniper]

I'll check that out for sure!

[lost inlet]

Extremely since Epic have pretty much said repeatedly that NPP is basically in maintenance mode, but i did see a commit the other day that adds an interpolation service for fixed tick

So you can do Quake/Source style prediction

[fossil spoke]

Do you know if there is any clue as to whether Mover 2.0 is being integrated into Fortnite?

[lost inlet]

I think you'd see that through the context of commits

[fossil spoke]

Makes you wonder why they even bothered if that isnt the end goal.

[lost inlet]

If Fortnite's using it, it's getting the VIP treatment

[short arrow]

Is mover worth using yet?

[fossil spoke]

Anecdotally it is not.

[lost inlet]

Also during the Mover talk, it was explained that experimental = we're not using it internally, and beta = we are

[fossil spoke]

Interesting, havent heard that before.

I guess it was just a side project for an individual within Epic?

[lost inlet]

So far yeah, so hopefully he doesn't end up leaving like the NPP dude did

[grizzled garnet]

Having an issue with my shipping build, port 7777 is not opening when ?listen is on. In editor it's fine, and I see it's an issue with the program as in Windows resource monitor I do not see the port under listening ports. Steam SDK is set up in the game, could there be some conflict going on from this?

[fossil spoke]

Are you using the Steam Socket Subsystem?

And not the IPNetDriver?

If you are using Steam to drive Sessions, you will not be able to connect via IP.

[grizzled garnet]

yes I'm using the steam net driver

fallback IPnet

so I guess if not launched through steam then it would work over IP

I'm wondering, I have the game set up in multiple steam accounts for testing, if I could just join a friend's game? Idk I didn't do much setup beyond basic session searching and creation

though it's clear currently steam isn't properly set up for the server browser

[grizzled garnet]

yes I see, I opened the game outside of steam and it's listening on the port now. I'll have to figure out how to get the steam net working properly now but thanks

[brazen anvil]

Quick question. In something like a FPS, do proxies run animation blueprint code? Or is there position just updated?

[fossil spoke]

The Anim BP is executed on every Skeletal Mesh.

Has nothing to do with the network context

[brazen anvil]

Ok got it. Thanks

[grizzled garnet]

There's a setting to actually run animations server side I'm fairly certain, had to do it in my game as actors attached were dependent on the animation state. Don't try syncing animations server-client though, it's too complex, work around it with some technical animation magic

[quasi tide]

Is it? Last I heard the perf was comparable to CMC 🤔

[fossil spoke]

I'm only going off what others have told me. I havent used it personally. But I would hope that its more performant.

[quasi tide]

@fossil veldt What say you? About perf with Mover

[heavy trench]

I've read through the Ownership section and I'm still confused because my client character is being possessed by a controller so shouldn't that mean the character has the same owning connection as the controller possessing it?

I could have swore that these same server RPCs were working before in my project but even in a blank 5.4.3 the same idea throws these warnings so idk what's happening 😅

[heavy trench]

And I also am getting similar warnings in the character owned component for health, which I am more confident wasn't happening until recently which makes me believe a recent change is causing this. The most recent change was the integration of the Cog ImGui plugin but I tried disabling it and commenting out it's relevant code to successfully recompile but the warnings still show.

Any suggestions to where to look from here?

[lament flax]

Yes it should work

Can you show where you call it ?

Also, arebyou sure that your character actor and components set to replicated ?

[heavy trench]

I will follow up with details once I am home again, it's morning where I am and I'm at work

I will verify that the character and the components are replicated after work as well; however I am fairly certain they are

[heavy trench]

This is the Cog ImGui plugin I was referring to: https://github.com/arnaud-jamin/Cog

I can't say 100% if this is the cause but its the most recent change that I can think of

[sharp hamlet]

Why does OnPostLogin returns PlayerController and OnLogout returns Controller?

[lament flax]

OnPostLogin returns a AController

its the BP version (K2_PostLogin) that gives a PlayerCOntroller

but they didnt do the same for the K2_OnLogout

yeah epic is kinda dumb here, they only call K2_OnLogout if its a APlayerController, but they didnt set the correct parameter type

so in your BP you can safely cast the AController to APlayerController since if its called it means its a APlayerController

[sharp hamlet]

Thankss, yeah I had to cast to my PC, it was weird so I thought I was doing something wrong

[thin stratus]

Does anyone know why the CMC applies RootMotion Velocity (Translation) before Movement and RootMotion Rotation after Movement?
Comment only says what's happening, but not why.

[keen oar]

I'm currently making a backrooms type game. More of a passion project of mine which I've really been enjoying making.

I've gotten quite far into development and when discussing with one of the streamers who will be playing the game on release, he suggested multiplayer.

Now this game is in BP and I don't MIND making it multiplayer I was just curious if the process would require me to restart my whole project? Also, since it is BP, would i have to start writing it in C++ now too?

[abstract arch]

Greetings!

If I want to communicate with players from the GameMode (eg call a function / not replicate data) is it common to keep a list of connected players in the gamemode ? using postlogin and logout to update that list ? or does one
use the GetWorld()->GetPlayerControllerIterator() every time you need a player ? (C++)

[abstract arch]

or get the playerlist from the gamestate ?

[chrome bay]

If you're doing this for Server logic, i'd probably use controller iterator

[abstract arch]

yes dedicated server

would you explain why this would your preferred way ?

[chrome bay]

Well, since it's the Server, you probably want to refer to the actual controllers as that's the true player representation

Player States have a slightly different lifetime, they can even be reused etc

For clients though, yeah you would use the PlayerArray from GameState usually

[abstract arch]

I see because the server keeps its own copy of the playerController ?

but how would I then know if the iterator takes the true playerController ? Want I want is to trigger a function being called on the player client by the dedicated server.

what about storing a list of playercontrollers on the gamemode, adding them on PostLogin and remove them on Logout ?

[thin stratus]

Turning a Singleplayer project into Multiplayer is usually not a thing. The logic and assumptions made in Singleplayer very often don't apply to Multiplayer.
Multiplayer is loads more complex and difficult and requires you to follow a lot of rules to make things work properly.
The chances are high that your Singleplayer project would need so many changes that writing it from scratch would be better.
That's also why everyone says you can't really add Multiplayer after the fact. At least not without a lot of headache.

BP vs C++ is a different topic. BP can do Multiplayer, but the majority of useful (and often needed) logic and stuff is in C++ land.

Obviously mixing BP and C++ is usually the preferred workflow anyway.

[fossil veldt]

shite

[chrome bay]

Ultimately that's exactly what the iterator would give you already, so you've got the same info in two places

[chrome bay]

can confirm

Network performance is vastly worse

Like it's night and day

[abstract arch]

I see, thanks for the insight!

[chrome bay]

also mover being based on NPP, like Cedric said, makes it rotten to the core

[thin stratus]

I thought we should avoid discussing this here so that the rot does not spread into our sanctuary, #multiplayer ?

Otherwise, I shall start screaming about Mover and RootMotion. You all don't want that.

[fossil veldt]

https://tenor.com/view/kill-the-rot-goofy-goober-silly-schizophrenia-gif-12414327510351470727

[pallid mesa]

Lol i think w'all jumped way too early ship onto mover X'D

[echo lynx]

Yes

Multiplayer is significantly different than single player.

[fossil veldt]

Hey listen, I saw horrors and turned back

[echo lynx]

You will most likely end up with 30+ cpp classes minimum (it's not possible to make a networked multiplayer game of decent quality without c++l

[fossil veldt]

ngl I have appreciated the CMC way more since

[pallid mesa]

cmc is confusing at times

(at times) hahaha

i just feel mover is not yet baked

they reworked parts of the root motion recently for the motion matching stuff

i saw the fixed tick thing, which was an adapted PR

[fossil veldt]

Justin imho needs to just completely gut NPP and throw it out and replace it with a Kinematic mover liason which just works like CMC+

I get the feeling Epic is just doubling down on the physics prediction liason as the default which kind of sucks

[lament flax]

Is it also shit when using Chaos net prediction ?

[lament flax]

What are the chances that they accept a PR that changes the signature of K2_OnLogout ?

[chrome bay]

chaos unrelated to NPP

Oh well, I guess they ahev the scene prediction stuff with fixed tick. Never gonna use that myself

[lament flax]

I meant Mover can use chaos as net "method"

[quasi tide]

Ouch, lol. In CMC we trust 🙏

[abstract arch]

question about playerIDs, what is the difference between playerID and UniqueId in playerstate ? are these set automatically ? or do I need to set those myself using the setPlayerId or setUniqueId functions ?

also what is a good place to learn more about these things ? the documentation on the unreal site seems very barebones

[chrome bay]

PlayerId is pretty useless. UniqueId is a globally unique id for a player account which usually comes from whatever platform service you are using

[abstract arch]

what do you mean with platform service, something like amazon gamelift ?

[lost inlet]

no like Steam, Xbox Live, PSN, EOS

[abstract arch]

ah so unique id associated with someones steam account for example ?

[lost inlet]

yes, Steam will use the 64-bit Steam ID as an identifier

[abstract arch]

ok cool. If I would like to add my own identifier, could I user the playerID for that ?

in stead of adding an id variable to playerstate

[chrome bay]

playerID IIRC is just an incrementing counter, not really anything special about it

[abstract arch]

thanks!

[woeful ferry]

Anyone knows why the inventory gets the doubled the size from the server? I set the inventory to be size 25 on server, when it gets replicated down to the client, they have 50, but it says it added 25 indices

Client does no calls to setting the inventory

[daring gorge]

anyone know how to fix this jitter?
ive used the same system of attaching player to a vehicle and sending their input to the vehicle on my boat, the attachment is replicated too, boats work perfect w the same system and im currently using smooth sync for the time being, however this jitter appears on client, when i play as listen server its perfect

[lament flax]

maybe it replicatd twice ? if it makes sense

[woeful ferry]

Solved it. The hot reload of Angelscript had bugged out, it used an old constructor

[lament flax]

x)

[woeful ferry]

Editor restart solved it

[heavy trench]

I have confirmed that both the character and the component in question are set to replicate. For the time being, I am calling the Server RPC on tick of the character actor in order to update locomotion variables used with the Gameplay Animation Example.

The chain of events that leads to the final PossessedBy is PostLogin-> HandleStartingNewPlayer -> RestartPlayer -> RestartPlayerAtPlayerStart -> FinishRestartPlayer -> Possess -> OnPossess -> PossessedBy

[lament flax]

calling RPCs on tick is just saturating bandwitch

you might start experiencing late replication for other stuff

[lament flax]

you didnt show code where you called the RPC

[heavy trench]

its in Blueprint

Get Desired Gate uses enhanced input to get the vector2d length of the movement input action and uses that to compare with a minimum threshold for walking and running and sets the enum accordingly

[lament flax]

i would like to see your original setup

[heavy trench]

There is no other RPC that I am calling so I don't understand what you are referring to

[lament flax]

so since the beginning yo uare doing this in tick ?

you should redesign that

make the variable "Gait" replicated

[heavy trench]

yes, I am doing it right now based on the example project animation setup and it was working fine for a while until it wasn't and that is where my confusion stems from

[lament flax]

also, i dont understand why you call this from client for server

[heavy trench]

It is based on enhanced input values which is data that comes from the client controller, no?

Get IA_Move in this case

I assume it would be better to handle this enhanced input event from the controller and pass the data to the character instead?

[lament flax]

i would suggest listening to changes on client and only tell the server when it changed

this would avoid unecessary RPCS

[dark edge]

why is an rpc involved at all here?

get desired gait is local so just do that on tick on serverside version of the actor

what drives the gait?

[heavy trench]

Enhanced Input action value length, so the left thumbstick

[dark edge]

thats not on the server

Shouldn't gait be derived by velocity anyway? Do you want to sprint into walls?

Unless you have some specific reason to drive gait by input and not resultant velocity, you can just do all of this in the anim bp

[heavy trench]

this just to drive animation changes, the logic comes from the gameplay animation example project

it uses a chooser with this enum to pick the appropriate motion matching data

[dark edge]

You using CMC?

[heavy trench]

yes

[dark edge]

why not do the choosing in the anim bp, everyone agrees on the velocity of the thing by default

that's the typical approach

input drives movement which drives animation choices

input driving movement is already handled for you through the CMC

[heavy trench]

I am just working with the example that epic made and exploring from there; not sure why it was decided that the chooser logic was driven by character exposed variables and not in the anim bp itself

[dark edge]

Did the example explicitly run the chooser logic on INPUT or on resultant STATE?

Anyway, remember that inputs are local only. If you 100% wanted to proceed with whatever you're doing, you'd want to send the input vector or the resultant enum choice to server on tick

not a good design IMO though

[heavy trench]

the animation example definitely was not made with multiplayer in mind so I will take all that has been said into consideration when moving forward

[grave lynx]

I have a issue with GetOwningPlayerPawn() inside a widget in multiplayer, on client side. In player controller, OnPossess, I run a client rpc and I CreateWidget, the owing object is this since we are in Player Controller.
Then, inside widget Construct, I'm just trying to check if pawn is valid.

if (GetOwningPlayerPawn())
{
    UE_LOG(LogTemp, Warning, TEXT("VALID"));
}
else
{
    UE_LOG(LogTemp, Warning, TEXT("NOT VALID"));
}

Maybe the workflow is not right, any idea?

[subtle kernel]

guys, I have the same code on windows machine and osx machine. I package DebugGame for both server and client. Windows run server, OSX run client. When I try to connect to the server I get error:

[2024.10.10-17.19.10:167][251]LogNet: NotifyControlMessage: Client IpConnection_2147482446 connecting with invalid version. LocalNetworkVersion: 3441883198, RemoteNetworkVersion: 2142559453, LocalNetFeatures=GenericReplication, RemoteNetFeatures=GenericReplication

How to make them match? What makes the difference? Is it possible to fix?

Should I manualy set version like:

[/Script/Engine.NetworkSettings]
NetVersionOverride=3441883198

[ivory halo]

Hi, I'm encountering a problem : I updated a project from 5.1 to 5.4, but now clients don't have access to variable, it returns "none" for them; give that in 5.1 everything worked correctly, am i missing something ?

[velvet current]

Struggling with ApplyDamage. Why does the first collision print damage of 0, and not get seen by Event Any Damage? When I print the target hit it's always the same (correct) actor, whether or not Apply Damage is actually delivered. Happens with and without emulated network latency.

[velvet current]

What variable? Can you share screenshots/more info?

[velvet current]

you might need to link "GetPlayerController" off of GetOwningPlayerPawn

[ivory halo]

sure, active weapon is invalid on client (the weapons array is being well set)

[velvet current]

sorry, i'm still lacking info when you say the client doesn't have access to the variable. are they accessing from another BP? Is the variable set to private?

[ivory halo]

nope, they are accessing it from here : what i circled in red is not valiud

[keen adder]

Heyas, is there any float optimzations like FVector_NetQuantize?

Or should I just cast it to an int and back, multipling/dividing to save the decimal points?

[queen escarp]

hmm how do u guys handle npcs attacks ? if u have a mob witha swordfor instance do u use event notyify on a specific point and trace or whats the best way ?

[dark edge]

That can go a million ways

I like to keep it consistent though, whatever the system is, it should be the same for an NPC or the player's pawn

They should literally be the same base class IMO

[queen escarp]

hmm

hmm aye

its just somethings weird with my settup

sec ill show u

hm ok so basicly i have a timer by event that loops every 0,01 seconds and i pause it

then when notify in montage starts it unpauses then pauses when montage notify end i run

and i trace between the points,

works on player but on the enemy it dosent work

[dark edge]

Why timer?

[queen escarp]

each tic is when i trace

[dark edge]

why not use tick

[twin juniper]

In C++ multiplayer development in UE, should I use the deprecated built-in Damage System or create my own? It doesn't seem very complicated. Thanks in advance!

[dark edge]

you don't get to do stuff faster than tick

[queen escarp]

aye i know, its just easier to keep them seperate with the timer

just preffered way really

[dark edge]

What doesn't work about it

[dark edge]

I'd make my own but it depends

if you just have damage and that's it, who cares

if it's more complicated than that with damage types and fancy math, it can be different

[queen escarp]

it dosent trace at the right location really

[dark edge]

skeleton probably isn't ticking on server

[twin juniper]

do you think it would be complicated to do my own? or just an interface and it's pretty much done

[dark edge]

Interface or a StatsComponent (best IMO)

[queen escarp]

or wdym ?

[twin juniper]

Why a StatsComponent? What would it be holding?

[dark edge]

stats

like HP

[twin juniper]

I'll have something like this for sure, but for doing something like this:
Shot -> Hit Actor -> Apply Damage to that actor

Would that just be a function inside that component?

[dark edge]

Shot -> does HitActor have a StatsComponent? -> yes -> call ModifyHP on it

The shot damages the StatsComponent, what that does is up to the component and its owning actor

[twin juniper]

That sounds good, Thx!

Can that be done with bones? (Complex line trace)

[dark edge]

All roads lead to Rome GAS

[twin juniper]

hell nah, I'm trying to avoid GAS

[dark edge]

Yeah me too, it's just too much

but a gas-like system is def. worth doing

[twin juniper]

Do you think I can check if it has that component and get the bone info?

[dark edge]

Component can hold a map of bones to values or whatever

you're talking about HP per bone?

[twin juniper]

yes, also asking if with a complex line trace you can check if the actor hit has that component? (because I currently only know that it check for bones)

[dark edge]

You'd trace then decide on what got hit then check if it has a component

Trace -> hit thing -> do it have component -> no -> oh well

that'd be like gun hitting a rock or whatever

for the bones thing

Trace -> hit thing -> do it have component -> yes -> tell component you hit its actor (also tell it what component got hit and what bone index or whatever) -> let it handle it from there

[queen escarp]

hm i kinda solved it but im using a event tic now, is that a common way to use attacking ? i rarely use event tic cost im afraid of the cost :/?

[dark edge]

What cost?

Each frame, do you care about whether or not a hit just happened?
Something somewhere has to tick to check

[queen escarp]

yeah i know

i just never use event tic but ive heard ppl use it before for this type

[dark edge]

So you don't do things per frame?

how do you move things

how does anything happen

[queen escarp]

yeah i get what your saying event tics are everywhere

[dark edge]

The cost of tick in blueprint is just the fact that some people put a bunch of blueprint nodes on it and do unneccesary work every frame

Basically your cost per frame is NumThingsTicking x AmountOfStuffTheyAreDoing x 100 if in BP or 1 if in C++

[queen escarp]

oh really bp is that much more costly :/

[dark edge]

yes but whether or not that matters depends

going from 0.01 ms/frame to 1 ms/frame, not a big deal

going from 1 ms/frame to 100 ms/frame, huge deal

[queen escarp]

true

[twin juniper]

well 1 ms is kind of a big deal

if you do not need it

[dark edge]

Yeah I'm talking total cost

the fact that BP is slow is a nothingburger if your total BP cost pales in comparison to the rest of the base cost on game thread.

but if your BP cost is dominating the game thread, it's time to refactor

[shrewd ginkgo]

Blueprint Runtime Error: "Accessed None trying to read property GameUI". Node: Set with Notify RemainTimeSec Graph: OnRep_RemaingTime Function: On Rep Remaing Time Blueprint: InGamePlayerController
Blueprint Runtime Error: "Attempted to assign to None". Node: Set with Notify RemainTimeSec Graph: OnRep_RemaingTime Function: On Rep Remaing Time Blueprint: InGamePlayerController
Blueprint Runtime Error: "Accessed None trying to read property GameUI". Function: On Rep Remaing Time Blueprint: InGamePlayerController

I don't understand why it gives this error even though I created the GameUI variable. The strange part is that it works without any problem, but when I close it, it gives this error.

[dark edge]

why is showing UI an RPC

also GameMode only exists on server

there is no clientside GameMode to RPC to

[shrewd ginkgo]

I used it because I want it to reflect in the UI every time the variable changes. the counter should be in gamemode and I should distribute it to the players

what I need to do

[dark edge]

Counter should be in GameState probably

[dark edge]

And "every time it changes" -> RepNotify

[shrewd ginkgo]

can everything else remain as it is?

already using rep notify

[dark edge]

no clue, there's a lot

[prisma snow]

Would there be any reason that simulating a multiplayer game (listen server + client), if I run under one process, everything runs fine, but if I run in different processes, client has a lot of lag?

[dark edge]

Your code probably can't handle latency and that's been hidden from you this whole time

you using network emulation?

[prisma snow]

nope

[prisma snow]

Mmm could you elaborate? Why would playing on one or two processes be different?

[dark edge]

You've effectively been testing with 0 ping this whole time is my guess

Not sure, but I'd guess there's probably some race condition that didn't show up before and now is

[prisma snow]

So generally I tested without ping, but I also did run some controlled tests with emulation settings, nothing felt half as laggy as now (it was time ago, so the game complexity is now higher).

[dark edge]

define laggy

what is actually happening

might not be network related at all, gotta know what's actually happening

[prisma snow]

What I don't know, is why ping would be so high given that both processes are running on the same machine

[dark edge]

do you know that it's actually a latency issue?

what's the symptom?

[twin juniper]

on the same machine, ping is 0

[prisma snow]

So I'm testing RTS movement, and one change I did recently was that pathing is now calculated on server and replicated instead of calculated on client and server

the replication of the path (which a small array of 3-4 vectors) takes enough to be noticable

I'll first of all debug the ping, should have done it before

[dark edge]

maybe server is running at 4 hz

who knows

[prisma snow]

it is running slow because I don't have the window focused, I can see that (it's a listen server)

[dark edge]

Uncheck the "use less cpu in background"

or whatever it's called

project settings

[prisma snow]

ohhh I didn't know that was an option

funny, I unchecked the option and it's still doing it

stat net shows ping between 50 and 150 depending on which window I have focused

[dark edge]

maybe you do have network latency in the mix somehow

that's sane ping, make it work

[prisma snow]

yeah it's sane but weird, would have never imagined

[dark edge]

does it seem to take 50-150 ms for something to move once you give the command?

[prisma snow]

yes, or more

[dark edge]

perfectly reasonable for a server-authoritative RTS with no prediction

[prisma snow]

but maybe it is the path replication that is slow

I am using a FFastArraySerializer

[dark edge]

Could be, I'd do some timing tests

[prisma snow]

yeah, I planned to support pings between 0-300

[dark edge]

have client send an RPC and time how long it takes between setting the replicated var and getting the RPC back

[prisma snow]

good idea

and thanks a lot for the support

[dark edge]

RPC should be as fast as possible so it'll give you a sanity check

I'd look at replication frequency too

[worn flint]

Do you guys know of any way I could get my character's last inputs to be replicated to the server without sending data ?

I saw that there's a FSavedMove class that is used for network compensation, could I get the last inputs from there ?

[prisma snow]

yeah, I'll check all that. However you made me think that actually, this is a good situation because if I manage to make it work better in this conditions, it will be a better playing experience overall.
I think I'm going to try to implement prediction for the pathing - it's not that complex and should give good results most of the time.
One of the things we wanted to implement was some debug/log information about how "deterministic" the game is, to track which things tend to desync more and work on those

Also I have realized that the move order (which is not predicted, it's a reliable RPC) does arrive back to the client very quickly, while replicated path is very slow. Maybe the problem is the FastArraySerializer helper actor, will try with a normal replicated array and On_Rep to check

[twin juniper]

currently my game looks good for 0 to 120ms, do you think this is enough for listen servers or do I need to make it to 150 or 200?

[brazen anvil]

Is it better to have more components with less replicating variables each, or less components with more replicating variables each?

[shrewd ginkgo]

In the stabbing event everything works properly and the simulate physics in onrep healt works but the UI show death menu in the same place does not work.

UI show death menu also works if I use this dmg actor

and players other than the server can't run the kill event.

[jade scroll]

guys the unrela engine is full of bugs. i cant even work with this bugs. my whole project goes down.

nothign work anymore. if i change some code from save game or some structure.

if i ge tthis bug i can only code the project new. nothing will help anymore. the is the most fkc on earth

[fossil spoke]

If the engine was full of bugs as you claim, no one would be using it. Maybe you need to re-evaluate that assertion, perhaps its you that have introduced those bugs in your own code?

[jade scroll]

my code working fine

its the structure bug of unreal engine

the most people dont have any project or sturccture... they only playing wiht unreal

if you have big project you will know the bug

its the biggest fkc inearth

[verbal ice]

Worked on big projects, no idea what you're talking about

[jade scroll]

then you never workd on project 😄

i give my blood for it.

do you have strucures in your game?

structure? do you have ? in your game?

referenced by 20 blueprints

[verbal ice]

Pretty sure this is the wrong channel for this

Elaborate what your issue is, if it's Blueprints, #blueprint, if it's C++, #cpp

[jade scroll]

pssst you never code anything. dont talk anymore thanks.

unrela engine is full of fkcn bugs. i need now again my project from new.

compelte from new. -.-

[fossil spoke]

@jade scroll This is not ontopic for this channel.

[twin juniper]

HAHA

[verbal ice]

Lovely :^)

[jade scroll]

if some code with unreal. you woud know this bug 😄

[twin juniper]

then code your own engine :3

[jade scroll]

i give my blood for this my face and ym word

[fossil spoke]

Please move to an appropriate channel if you want to continue. Otherwise move on.

[dark edge]

That code is messy though

are you intending for the boolean IsDead to only ever be set on server and owning client? Because the controller cast will fail on other clients

[lament flax]

i dont think it matters much, the issue in performance is probably somewhere in your design
but the best is to have the smallest amount and size of replicated data

[brazen anvil]

Yeah I know the smallest would be ideal but im sure one or the other is probably preferred.

[dark edge]

Probably less components but just keep it sane

[lament flax]

do what fits the best for you design and comfortable

[dark edge]

fitting the design is the most important thing

[twin juniper]

How to force an actor's transform to replicate always?

[brazen anvil]

the design works both ways

[dark edge]

replicate movement checkbox?

[twin juniper]

well that doesn't do it

[dark edge]

how is the thing being moved?

[twin juniper]

well the actor parented to it rotates

[dark edge]

you mean the actor it's parented to? Does that actor have replicate movement turned on? How is it being rotated

[twin juniper]

I think I know the error

[twin juniper]

So since camera isn't valid on the server WHEN the player character is out of your viewport (which is weird), should I be sending server RPC on tick to update the a replicated value? (unreliable tho)

[dark edge]

what would camera have to do with this?

what are you actually doing here?

[twin juniper]

I'm spawning weapons based on the camera's forward vector

Would it be 'fine' to call a Server RPC on tick?

[dark edge]

no don't

[jade scroll]

if no one here know the structure bug. this cant be real xDDDDDDD

[dark edge]

don't rely on the camera for anything but the local players stuff

[dark edge]

What are you talking about

[jade scroll]

waht im talking about? haha

did you ever code soething in unreal engine?

[twin juniper]

yea that's what I do, but then I need to store that rotation on the server, because weapon will retrieve that data on the server

[dark edge]

Yes, now what is this structure bug you keep talking about?

[jade scroll]

hahaha

go to your project. add a variable to strucure

[twin juniper]

he says bullshit, ignore him

[jade scroll]

and nothign will work anymore

[dark edge]

don't. You don't directly care about the camera. You care about a rotation, probably ControlRotation.

[jade scroll]

bullshit? are you kidding me?

[dark edge]

I do it all the time and it works fine. Unless you're talking about BP structs, those are fragile.

[jade scroll]

go to your srucute add a varibale and all blueprints refnreced with this trucute will not work anymore

[twin juniper]

right, but I need a FRotator on the server

[dark edge]

Come back once you've sobered up.

[jade scroll]

it works fine?

[dark edge]

Yes

[jade scroll]

show me your strucute show me your project

you ar ekidding me 😄

[twin juniper]

I don't see another way of doing.. maybe someone else has a clue

[dark edge]

You already have one, sort of. ControlRotation

[twin juniper]

this is server replicated?

Is this integrated in the camera or camera boom?

[dark edge]

Here is one of many structs in my projects that I have modified many times. It all works fine. Any nodes that referenced removed properties have to be fixed up but that's to be expected.
https://github.com/AdrielKinnunen/SpectrelightPlugins/blob/492698537d659d9d0636f2e958e7fb8ccf7f15ae/Plugins/SLMechatronics/Source/SLMechatronics/Public/Domains/SLMDomainAir.h#L20

[dark edge]

ehh kinda

[dark edge]

your camera boom and camera USE IT, at least in the typical setup

[twin juniper]

ye, I think I'll go with RPC on tick since I have a pretty customized setup

because it's another rotation, not exactly like the one from the camera

[dark edge]

I mean if you need a replicated rotation then you just need one, but look into GetBaseAimRotation

btw we talked about this a while ago lol

[twin juniper]

I don't think so

when?

[dark edge]

LOL I was mistaken, I was talking to you about something at the same time someone else was dealing with this problem.
#multiplayer message

[vague ocean]

how do I stop the customrenderdepth from replicating?

[dark edge]

Does it?

[vague ocean]

it has to be, im setting it to highlight an object that a player is focussed on

[dark edge]

show code

[vague ocean]

but its showing on all clients

[hollow eagle]

you sure you aren't just running your code on all clients

custom depth doesn't replicate

[dark edge]

I bet you're doing that instead

[vague ocean]

great question haha

I haven't looked at the code in a while

ill check in a little bit

unreal takes a bit to boot

[twin juniper]

what's custom depth?

[vague ocean]

Ok, so its a bit convoluted, but here's the setup
Interactable.h interface: c++ UFUNCTION(BlueprintNativeEvent, BlueprintCallable, Category = "Interaction") void Focus(AActor *Caller);

InteractableBase.h implements it: c++ virtual void Focus_Implementation(AActor *Caller) override;

implementation: ```c++
void AInteractableBase::Focus_Implementation(AActor *Caller)
{
this->m_InteractableMesh->SetRenderCustomDepth(true);
}

Discord formatting 💀

[vague ocean]

The main use case I've seen is for highlights around object meshes

[vague ocean]

would that be a multicast?

[hollow eagle]

I don't know what you're doing

the option to render custom depth is not replicated

but your code telling it to render custom depth may be

[vague ocean]

there's not a single multicast in the project

if thats what it would mean to run it on all clients

[hollow eagle]

I didn't say anything about multicast

[vague ocean]

Yeah thats what im wondering

How would it run on all clients?

[hollow eagle]

Multicast is not the only way for this to happen

Because every client may be running the same logic even for non-local characters

I don't know your code

something is calling Focus on all clients, or you have other code enabling custom depth somewhere.

The engine does not do this on its own.

[vague ocean]

Hmm

Ok ok

This is a good starting point to look for it

[vague ocean]

Could be a stupid question, but is there any thing inherent about running Execute_Focus() that makes it run on all clients?

[hollow eagle]

no

[vague ocean]

hm

[vague ocean]

Something is very sussy lmfao, for some reason when focussing on an object on a client, it always shows the focus on the listen server instance, but only sometimes on the other clients?

does it sound like unreliable replication or am I losing it

[hollow eagle]

You're just making wild guesses. Is anything involved in calling your function involve replication or RPCs in any way?
Is the code that calls this function running even for non-local clients like I've said multiple times?

And if you don't know what calls this function or from where, debug it. Place a breakpoint.

[vague ocean]

I've looked at every call, there doesn't appear to be any RPCs

[hollow eagle]

Is the code that calls this function running even for non-local clients like I've said multiple times?

[vague ocean]

Mb lmfao

Lemme check

[daring gorge]

anyone have any idea why this is happening? my attachment is properly replicated and im using smooth sync for the time being, my boats work properly with physics being simulated, however my heli doesnt.
im attaching player to vehicle and passing input to the vehicle

[vague ocean]

alright, so that resolves one question

Not replicated, it is being called on all clients

How tf that is happening is the next question

[hollow eagle]

Because you're not checking if something is locally controlled before running code that should only happen for the local player

[vague ocean]

Ah ok, that makes sense

My networking mental model is not accurate, I thought that was the default tbh

I gotta reread the compendium

[hollow eagle]

If an actor exists on all clients then it runs code on all clients. Some actors only exist for the owning player, some exist for everyone.

[vague ocean]

Ok ok, that makes sense

What is the correct check to do?

isLocallyControlled?

[twin juniper]

@dark edge I've done what you told me to do, but it still doesn't change the rotation when the client is out of the server's camera's viewport

I'm attaching components like this, I don't see any problem:

FAttachmentTransformRules TransformParams(EAttachmentRule::SnapToTarget, true);
Actor->AttachToComponent(Mesh, TransformParams, "Socket1");

[vague ocean]

probs out of relevancy

change the relevancy setting

[twin juniper]

it's literally 4 meters away, not sure why but when it's kind of in the server's vision cone, it rotates normally on the server or otherwise it doesnt update

[crystal crag]

Hey everyone. I've been out of the loop for a while. At a very high level, using the latest UE 5, what is the best way to handle transferring players into another environment? For example, the players are outside and you want them to interact with the doors to a building to be transferred inside. Is level streaming still the way to go or have better systems emerged over the past few years?

[golden seal]

Hey all, Metahumans/networking question here. I have a Metahuman set to live retarget off of my third person character mesh, and in most cases it works fine. If I set simulate physics on my character from the server, however:
It is fine on the local client
It is fine on the server
But OTHER clients see the metahuman fly off playing the falling animation, reset the location back to the capsule, and fly off again repeatedly.
Even more weird, if I enable visibility on the parent mesh it simulates physics just fine on other clients. It is only the live retargeted metahuman child mesh that acts strange. Does anyone have any thoughts as to what I might be doing wrong here? I've been googling for days and haven't come up with anything

[hybrid crown]

Hum, we agree that a DOREPLIFETIME_ACTIVE_OVERRIDE in PreReplication(), must also be registered as DOREPLIFETIME in GetLifeTimeReplicatedProps ?

[ember vine]

are u supposed to run rootmotionsource on clients and server or just serv ?

[thin stratus]

PRetty sure if you run them on just the Server they will start running on the Client as part of a correction.

[prisma snow]

@dark edge Just writing since we discussed the other day, I timed the client RPC time, then the time when order was multicasted (client recieves order back) and finally the time when the path is replicated:

• Between client RPC and getting server RPC back, it's aprox. 200ms, which is acceptable delay. It is also quite stable and in line with ping values.
• Between the RPC getting back and the path being set, it oscilates between 700ms and almost 2 seconds. We use async pathfinding but I don't think this can cause such a delay.

[EDIT]: After more testing, I found out that his delay is only happening if the client moves his units. If the server moves his units, it works very well on the client too (100-200ms of delay). So it seems related to who owns the actors?

[crystal crag]

Is there any way someone could give me some keywords to search when trying to learn about different systems available to help move people into sub-levels? I know there is level-streaming. Are there any other newer / better systems for this?

[thin stratus]

You are still locked to one World per Server, so despite that and maybe WorldPartition, there isn't much else you can do.

Other than not using Unreal's Networking stuff at all.

[crystal crag]

I'm not nearly advanced enough to even entertain that idea. I'm trying to make a rather simple game this time around. The one I was trying before I just didn't have the knowledge or available time to get it done within a reasonable time frame. The one thing I wanted to do though was (without doing a server travel) let players "warp" (for lack of better term) into the main building when they are outside or warp back outside. The inner building would have its own lighting and actors inside, which can be handled with level streaming, I just thought maybe something more fancy had been released. Something that works in conjunction with world partition and data layers or something. I can't remember where I heard an unreal dev talking about it, but had something to do with one of the earlier UE5 releases.

[thin stratus]

Nope, you still gonna hide that interior somewhere in your world (if it otherwise doesn't fit) and stream it in.

[soft relic]

Or use something like OWS but not sure how updated that is nowadays

Seems like it supports UE5 though

But, that most likely requires more advanced knowledge of unreal and networking.

[queen escarp]

question this is on a "npc" but it dosent get cleared

since im playing on a client and thisis a server controllednpc

what ami missing

[dark edge]

what machine is doing the clearing?

show the code back to the triggering event

[queen escarp]

https://blueprintue.com/blueprint/sj-op8sb/

[queen escarp]

here

[dark edge]

Your problem is probably that Ignore Actors Attack is replicated is my guess

what machines run this code, all of them? Just server?

[queen escarp]

just server

i mean this is no different from what i use to do " npc plays montage at notyify trace if hit deal damage... simple as that"

[dark edge]

Put a breakpoint on it, make sure it's actually being hit

[queen escarp]

it is...

its not applying damage tho also

when i play as t helisten server it works

oh wait when i play as listen server + client then it works on the client side also

is when im playing only 1 pie as client it dosent react to "server" being enabled ?

[hard gale]

I have an ability (different than jump) that launches a character over a short distance with increased speed (at 1200 speed, compared to max walking speed = 600). If you jump right after this ability, you can make a longer jump than usual, thanks to the increased speed. I'm trying to prevent that, so that if you jump right after, you make the normal jump.

When the ability is used, I toggle a boolean on the pawn (in BPs). This boolean is checked at each tick of the pawn, and whenever the pawn touches the ground, the pawn is slowed down. The logic works well in Standalone mode but in multiplayer it makes a rubberband effect, and doesn't work reliably every time, even with relatively low ping (70ms). Meaning sometimes the jump will still be faster than usual.

To slow down, I've tried these techniques:

• Slowing down with Add Input (backwards)
• Slowing down with Set Velocity

For the boolean in the pawn, when using the ability, I've tried to:

• Toggle the boolean both on client/server and apply the slow down on both
• Toggle the boolean only on client side, then do the slow down client only, or replicate the slow down on both
• Toggle the boolean only on server side, then do the slow down server only, or replicate the slow down on both

I always have the rubberband/fast jump regardless of how I do it, am I doing something wrong?
This is implemented in Lyra/UE 5.4

[grand kestrel]

Add your ability state to CMC prediction. Override UCharacterMovementComponent::DoJump() to clamp the non-z velocity or however you want to handle it. You might still get a correction but at least it'll recover and players shouldn't feel it

[hard gale]

I'd prefer not to change how the jump works, because I'd also like to have variants of the game where the player is able to do this fast jump once (but not twice). Is there a way to do this without changing the jump? The ability is done using normal "Launch", so it I thought it should be automatically added to the prediction (the ability in itself doesn't rubberband and works well, it's my added boolean which doesn't work well)

[half umbra]

Hello,
how can I check in the widget if the Player Array in Game State has changed>?

create a new RepNotify Array and create an Event Dispatcher?

Is there a better, more efficient solution?

[queen escarp]

you got any tips on how i would do the ai rotation :/? im kinda using timeline rotation now after ai attacked to rotate towards the actor location with is a very bad way of doing it how would u do it ?

since if its attacking and i run behind he needs to rotate towars the player

[quasi solar]

Hello everyone, quick question: what is the cleanest and most efficient way to lower a platform in a multiplayer context, without experiencing latency on the clients? I'm using a timeline (in Blueprint) that I trigger on the server, and I replicate the new position of my platform with each update, but the clients experience a slight jitter. I'm not sure if there's a way to avoid that by doing it differently.

I was suggested to try executing the timeline on each client, but I don't really see how to do that. Or to do something similar to the CMC, but I don't really see that either. Any ideas, please?

[oak pond]

wait so is your event on the Update node itself

[vapid gazelle]

Is there anything like a Get Game Time in Seconds, but one that gives every client in the game the same value regardless of when that instance of the game started? My understanding is that Get Game Time in Seconds will be specific to every instance of the game, but I'm wondering if I can get ahold of a synchronized time value somehow that's identical and shared across all of the instances.

I'm guessing some kind of a synchronized clock?

I'm seeing this on the forums:

GameState::GetServerWorldTimeSeconds() is a network synced clock time. The server updates this value every 5 seconds to keep clients synced with a universal world time. Yet, clients values can differ greatly depending on their ping/jitter at the time of update. So it’s never truly accurate. Mainly an approximation.

I wouldn’t worry about time discrepancy on cool downs. If coded so the server maintains authority it won’t matter what the client does or doesn’t do.

Clients are always ahead of the server in respect to movement, location, actions etc. Inputs for an update interval are bundled and sent together. Meaning our clients execute them locally first (client-side prediction), then send bundled to the server.

Updates sent to the server are timestamped. Each input is timestamped. Packet headers have timestamps as well.

[blazing bear]

If you do it without timelines, there'll be no need to replicate movement, you can get it to look like a timeline using some math, the key is to be deterministic. Have the server calling the platform to be lowered set the variables used for movement, the variables needs to be marked as replicated, then set a bool bLowerPlatform and enable tick, use OnRep_bLowerPlatform to enable tick for the clients. During the tick, you check if bLowerPlatform is true, do the movement (using DeltaSeconds obv), once the platform reaches the desired location, disable tick. You can also force the platform to have its location set to match the server's in OnRep_bLowerPlatform as sometimes it could be off by a millimeter or so.

[brazen anvil]

When I equip a weapon I need to change a animation layer. Should this be a replicated variable or should I change it in the OnRep when the weapon changes?

[fossil spoke]

Ideally you would trigger as many changes as you can from as few Replicated variables as possible. Therefore, using the OnRep from the Weapon itself sounds like a good idea.

[brazen anvil]

Yeah thats the way I am trying to think. I am having more of an issue determining what needs to be replicated for the proxies. But ill figure it out as I go.

[cloud crown]

i was not able to fix it my server is not sending data to the clients client to server works but not server to client

[soft relic]

Expose the OnRep of that variable from CPP to blueprints

By calling some blueprint implementable function on rep

[thin stratus]

Yeah, making your own would be one way.

[thin stratus]

That thing has no OnRep

What might help is to understand how that array functions.
It actually fills itself by the BeginPlay of PlayerStates and a single "Get me every PlayerState that is already valid." call by the GameState.

So in theory, instead of clinging to that Array, you could just hook into the PlayerStates becoming valid/invalid via their Begin and EndPlay functions.

You can use the PlayerArray to get the initial set of PlayerStates then, and handle the rest via the PlayerStates tell your UI or whatever that they are alive.

[soft relic]

@thin stratus Are you sure? im pretty sure game state had an OnRep for player array no?

Or maybe an updated function that was overrideable

[verbal ice]

AddPlayerState

RemovePlayerState

Both overridable

They handle adding and removing to/from the PlayerArray

[soft relic]

Right, thats it then. Not sure why I thought there was a rep but theres that

[ember vine]

when you do a servertravel on the server and the clients go into limbo state before the mapchange, are there any core delegates/events that fire at that moment ? or do i need to setup my own RPC

coz PreLoadMap is too late and pretravel on PC is also too late aswell

[thin stratus]

What do you wish to do in that scenario?

Requirements are somewhat important here, cause there might be stuff you can use if you tell us what you need :D

[thin stratus]

Yeah, the Variable also doesn't have the typical Replicated Property indicator in BPs :P

[ember vine]

@thin stratus load screen basically

On the client

[thin stratus]

Hm, I mean that is in fact usually done with the Map Load callbacks.

The only times I had to be a bit more crafty was when a Customer wanted to put the LoadingScreen over things that require other Threads to tick.

They wanted to cover up from the point the SteamSession gets its update call, which then never returned if using the MoviePlayer for the LoadingScreen, cause that only manually ticks the GameThread, not the Background Thread the Steam callback was sitting on.

But even that was relatively fine to solve, since the LoadingScreen was already a SlateWidget, I just wrapped it with a UWidget and plugged it into a UMG Widget which we then added first. Since they look exactly the same no one noticed that it#s in fact 2 different LoadingScreens after another.

I think we also added a UMG instance after the MoviePlayer one to cover up some more custom loading stuff.

[ember vine]

The map load callback is pretty slow tho, the client is in a limbo state for a few secs before it gets called

I basically want to hide the few secs where everyone just runs and no rpcs work

[proven pagoda]

So I tweaked Lyra's Equipment system to use Gameplay Tags more and it's working multiplayer in my project, but there's a few functions I'm not sure the reason for them or if needed at all or really why we do this. I understand what the functions are doing themselves, but are these needed? Should I be doing similar things for other components? I never have. ```cpp
bool UEquipmentManagerComponent::ReplicateSubobjects(UActorChannel* Channel, FOutBunch* Bunch,
FReplicationFlags* RepFlags)
{
bool WroteSomething = Super::ReplicateSubobjects(Channel, Bunch, RepFlags);

for (FOneLifeAppliedEquipmentEntry& Entry : EquipmentList.Entries)
{
    UEquipmentInstance* Instance = Entry.Instance;

    if (IsValid(Instance))
    {
        WroteSomething |= Channel->ReplicateSubobject(Instance, *Bunch, *RepFlags);
    }
}

return WroteSomething;

}```

[thin stratus]

Since the Server starts the Travel, you will always have the small delay for that RPC to arrive.

[thin stratus]

Not sure if that isn't outdated by now with that "new" ReplicatedSuobjectList thingy.
But in general that code there ensures the UObjects replicate too.

[proven pagoda]

Ok because the instance isn't there until the equipment is added to the EquipmentList and both the EquipmentDefinition and EquipmentInstance are UObjects

Thank you. I could really put it back and default and see if it works, but idk the side effects. I'm nervous just cuz it's in Lyra and I don't wanna leave something important out lol

[ember vine]

its like 5 sec tho its ages for some reason

i guess i can just fire an rpc from the server before doing the server travel

[proven pagoda]

I use the Async loading screen plugin and it works pretty well for me but idk if it's too basic for what you're doing

When my host hits server travel all clients instantly pop up loading screens and the server takes a second then hits theirs

[thin stratus]

The Assets that are UObject based are usually fine, cause they can be resolved locally.
UObjects by default don't replicate though, so the Instance that is spawned for your Equipment needs to be replicated. And since spawning a Struct or an Actor is both not as ideal, the UObject is chosen.

One could also use FInstancedStruct and wrap the Struct with it, but that has its own Downsides.

[proven pagoda]

This is my version of the AddEntry to the FFastArraySerializer EquipmentList struct ```cpp
UEquipmentInstance* FOneLifeEquipmentList::AddEntry(const TSubclassOf<UEquipmentDefinition>& EquipmentDefinition)
{
check(EquipmentDefinition);
check(OwnerComponent);
check(OwnerComponent->GetOwner()->HasAuthority());

const UEquipmentDefinition* EquipmentCDO = GetDefault<UEquipmentDefinition>(EquipmentDefinition);

TSubclassOf<UEquipmentInstance> InstanceType = EquipmentCDO->InstanceType;
if (!IsValid(InstanceType))
{
    InstanceType = UEquipmentInstance::StaticClass();
}

FOneLifeAppliedEquipmentEntry& NewEntry = Entries.AddDefaulted_GetRef();
NewEntry.EquipmentDefinition = EquipmentDefinition;
NewEntry.Instance = NewObject<UEquipmentInstance>(OwnerComponent->GetOwner(), InstanceType);

if (UOneLifeAbilitySystemComponent* OLASC = GetAbilitySystemComponent())
{
    OLASC->ApplyEquipmentEffects(EquipmentCDO->GrantedAbilityDataTags, /* InOut Handles */ &NewEntry.GrantedHandles);
}

NewEntry.Instance->SpawnEquipmentActors(EquipmentCDO->ActorsToSpawn);
MarkItemDirty(NewEntry);

return NewEntry.Instance;

}```

[thin stratus]

It's very common, when making Inventory Systems, to have a combination of:

• Some DataAsset for the MetaData that stays the same for Server and Client
• A replicated UObject Instance with runtime Data that has to be kept in sync
• A FastArray setup, where the Element holds the DataAsset and UObject pointer

[proven pagoda]

So this is better than spawning an actor for this data

[thin stratus]

TSubclassOf<UEquipmentDefinition>& EquipmentDefinition
Does that need to be a class?

[proven pagoda]

As opposed to?

[thin stratus]

EquipmentDefinition sounds the MetaData I mentioned

Stuff that is only setup during Editor time and doesn't change

[proven pagoda]

EquipmentDefinition is the BP asset that defines the piece

[thin stratus]

If it's an Asset, just save the SoftObjectPtr to it

Or ObjectPtr in that function fwiw

You don't need to get the CDO

You use U(Primary)DataAsset for this as a Parent.

Set up the AssetManager to know about them

And that's about it

Getting the Class and then grabbing the CDO is basically the roundabout way

[thin stratus]

Hm maybe. What exactly takes 5 seconds though?

That's really long

If you do this in an empty level/project, you'll notice it's usually relatively quick.

[proven pagoda]

Lyra does this and makes PrimaryDataAssets for the granted abilities and effects where I use this tag container

[thin stratus]

Yeah I would have used PrimaryDataAssets for the EquipmentDefinitions

[proven pagoda]

That's a lot of stuff I'll have to research I can't conceptualize how to remove the TSubclassOf and replace with a SoftObjectPtr

[thin stratus]

SoftObject is probably not needed at that point, you can load it earlier

[ember vine]

im not sure why it takes that long but its the case on other UE games that ive seen

its just GetWorld()->ServerTravel(MapName, false, false) being called on server

[thin stratus]

void USomeInventoryManager::SpawnEquipment(const FPrimaryAssetId& EquipmentDefinitionId)
{
  /// Load EquipmentDefinition via UAssetManager and the PrimaryAssetId
  /// Don't remember the code exactly.
  UAssetManager::Get().LoadPrimaryAsset(EquipmentDefinitionId, /** BundleNames = */ {}, StreamableDelegate::CreateLambda([this, EquipmentDefinitionId]()
  {
    /// Get the Object and cast it now that it is loaded.
    UEquipmentDefinition* const EquipmentDefinition = Cast<UEquipmentDefinition>(UAssetManager::Get().GetPrimaryAssetObject(EquipmentDefinitionId));

    /// Add the Equipment to the list, assuming the List lives in the Manager.
    EquipmentList.AddEntry(EquipmentDefinition);

  }), /** Priority = */ 0);
}

@proven pagoda

Something like that.

The cool thing if you start utilizing AssetData instead of Classes is that you can export some stuff to the AssetData to utilize without actually loading the Asset at all.

[proven pagoda]

Damn I feel like that's advanced for me

I have done 0 research into primary data assets and custom loading honestly

[thin stratus]

void ACH_Structure::GetAssetRegistryTags(TArray<FAssetRegistryTag>& OutTags) const
{
    Super::GetAssetRegistryTags(OutTags);

    OutTags.Add(FAssetRegistryTag(CategoryAssetRegistryTag, Category.ToString(), FAssetRegistryTag::TT_Alphabetical));
    OutTags.Add(FAssetRegistryTag(FriendlyNameAssetRegistryTag, FriendlyName.ToString(), FAssetRegistryTag::TT_Alphabetical));
}

[proven pagoda]

Ok I can read that that's interesting

[thin stratus]

We use that to show the Structures in the UI and categorize them without even loading them.

[proven pagoda]

Wow

[thin stratus]

Yeah there is a lot of cool stuff there.

But yeah, tl;dr you really don't need the CLass there, even without SoftObject stuff

You have an Asset there

Assets are referenced by object.

Soft or Hard.

[proven pagoda]

I'm working on just using a regular pointer maybe now

But this equip item was marked Blueprint Callable so idk if I can do that

[thin stratus]

I an only really advice you to let Unreal Insights run while you do that. On Server and Client, and see what takes so long.

[proven pagoda]

In my meta data I just put a TObjectPtr<UEquipmentDefinition>

[thin stratus]

If it's a matter of UE doing clean up etc., then yes, an RPC would be a solution, given that arrives quicker than 5 seconds.
But keep in mind if you start that MoviePlayer loading screen, it will only tick the GameThread.

[thin stratus]

In theory, the Definition is the MetaData

[proven pagoda]

Currently it's a struct in a data table

[thin stratus]

Right, that explains some of the trouble

[proven pagoda]

what trouble

[thin stratus]

While youc an totally use both at the same time and it makes totally sense to have some data in the DataTable, ultimately they serve a very similar purpose and you are basically starting to utilize two systems at once.

[proven pagoda]

Oh no

[thin stratus]

The only part where I've seen people mix them for what you are doing is putting data into the DataTable that the Definition then references a row of

I think @meager spade has some DataAsset, DataTable, like setup.

Basically, if you have some "categorized" data, that you want to not put into the DataAsset directly, and have it as a row in teh DataTable, you can do that.
I actually don't use them in combination. My Data for whatever I'm defining sits in the Asset.

[proven pagoda]

Ok so my inventory uses an Item Tag, and in my ItemDefinition is a data table which I can fetch any row by GameplayTag and in my ItemDefinition I include the TSubclassOf<UEquipmentDefinition> so I really call UseItem and it broadcasts out the TSubclassOf for the Equipment Manager to equip

[thin stratus]

There are probably good reasons for using either though.

Remember the FPrimaryAsserId in the function I posted earlier?

[proven pagoda]

I remember it from the code above

[thin stratus]

FPrimaryAssetId ACH_Structure::GetPrimaryAssetId() const
{
    return FPrimaryAssetId(FPrimaryAssetType(TEXT("Structure")), StructureTag.GetTagName());
}

[proven pagoda]

Oh you fetch primary asset ID by tag there don't you

[lament flax]

one example he said was for easy hot fixing

[thin stratus]

Yus, it's a combination of the AssetType and a Tag

[lament flax]

using data registry and data raw ref

[proven pagoda]

template <typename T>
T* UOneLifeAbilitySystemLibrary::GetDataTableRowByTag(UDataTable* DataTable, const FGameplayTag& Tag)
{
    return DataTable->FindRow<T>(Tag.GetTagName(), TEXT(""));
}```

I just wrote this in a static library

[thin stratus]

Right, cause you can load the DataTable from the Harddrive in theory, or?

I mean you can write a system that does that per DataAsset fwiw

That goes beyond the idea here though

[lament flax]

let me get a implmenttion i had

i had a DT that holds weapon data
and in my item fragment i have a ref to a row, i load it at runtime

void UPGWeaponDataComponent::OnItemLoaded(const FDataRegistryAcquireResult& DataRegistryAcquireResult)
{
    const FPGWeaponDataRow* WeaponDataRow = DataRegistryAcquireResult.GetItem<FPGWeaponDataRow>();
    
    if (WeaponDataRow)
    {
        BulletDamage = WeaponDataRow->BulletDamage;


        bDataLoadedLocally = true;
    }
}

nvm, the registry ref was in the weapon component (on the item actor)

so not in the DA

[thin stratus]

Yeah and that's fine. With AssetsIds you can ask the AssetManager for them via FPrimaryAssetId(FName("EquipmentDefinition"), Tag.GetTagName())

Or fun stuff like

TArray<FPrimaryAssetId> AllEquipmentDefinitionIds;
UAssetManager::Get().GetPrimaryAssetIdList(FName("EquipmentDefinition"), AllEquipmentDefinitionIds);

[proven pagoda]

Ahahaha

Ok well honestly it seems like then my current method isn't terrible but I also realize it's not using Unreal the best it can be used. I clearly need to learn more about primary data assets and proper loading systems. I have never done any real research into them yet.

[thin stratus]

They are also not very well advertised :D

[proven pagoda]

I started Unreal 1 year ago this week

It's a lot

[thin stratus]

But yeah, the stuff Fishy posts is also nice if you need the additional hot-patching stuff.

[lament flax]

virtual FPrimaryAssetId GetPrimaryAssetId() const override
    {
        FString TagString = Tag.ToString();
        int32 LastOccIndex;
        TagString.FindLastChar('.', LastOccIndex);
        
        FString Name = TagString.Mid(LastOccIndex+1, TagString.Len()-LastOccIndex);
        return FPrimaryAssetId("Items", FName(Name));
    };

[thin stratus]

A lot of people probably skip this, as they just patch the game.

[lament flax]

[thin stratus]

Yeah that's a cool helper to only use the Tag I guess?

[lament flax]

thats for debuging lol

so i can use a cheat command to give

[thin stratus]

I guess one could cut the Tag into pieces and use the first part of it as the Type

But honestly, probably not reaaallly worth it

[lament flax]

void USLInventoryCheatExtension::InvGiveDef(int32 PlayerControllerIndex, FString ItemId, int32 Amount)
{
    if (APlayerController* PC = GetPlayerController(PlayerControllerIndex))
    {
        ASLPlayerCharacter* PlayerCharacter = Cast<ASLPlayerCharacter>(PC->GetPawn());

        FPrimaryAssetId PrimaryAssetId = FPrimaryAssetId("Items", FName(ItemId));
        FSoftObjectPath FoundPath = UAssetManager::Get().GetPrimaryAssetPath(PrimaryAssetId);
        
        if (FoundPath.IsNull()) { return; }

        USLItemDataAsset* DA = Cast<USLItemDataAsset>(FoundPath.TryLoad());
    
        SL_INVDLOG("InvGiveDef §% §% §% to default inventory", *PlayerCharacter->GetFName().ToString(), *ItemId, Amount)

        FSLAddItemExtraData ExtraData;
        PlayerCharacter->GetPlayerInventoryComponent()->AddItemToInventory_FreeSlot(PlayerCharacter->GetPlayerInventoryComponent()->CreateNewItemFromDataAsset(DA), Amount, ExtraData);
    }
}

[thin stratus]

Yeah for Cheating that's fine.

That's a blocking load otherwise.

But that code is basically exactly what I meant earlier

[lament flax]

i didnt read the whole convo tbh

[thin stratus]

AssetId to DataAsset (definition) and then tell InventoryManager to spawn that crap

Na that was more for Uhr

[lament flax]

im more team soft object ptr

than asset id

[thin stratus]

I never considered them to be exclusive though

[lament flax]

they arent

[thin stratus]

AssetIds for custom Assets that need to be grouped, loaded, etc.
SoftObjPtrs for any other Asset, like Textures and stuff.

Can of course plug a custom Asset into a SoftObjPtr

The AssetIds are after all just a way to manage the Assets.

[tardy fossil]

Cut my tag into pieces. This is my last resort

Sorry couldn’t help myself

[proven pagoda]

Can you not EditDefaults in a data table for a TObjectPtr ? When I used TSubclassOf I could fill in data inside my data table, but now I've put TObjectPtr instead and my data table won't let me fill in any data.

I put a TObjectPtr on my GameMode and I can put a Data Asset in there

but not inside a struct inside a data table

This might really all have to be TSubclassOf if I wanna do this like this

Man I just refactor all the code to use this TObjectPtr now I gotta undo it all

Yeah I change it all back to TSubclassOf and now I can put it in the data table again

man

[meager spade]

Data assets hold rows for things like stats etc as datatables can be balanced externally and hot fixed. So all tweak able stuff for balancing is usually curve/datatables using tablerowhandle/fscalablefloat

Our crafting recipes are a data table holding assetid to definitions.

[meager spade]

Whut

Tsubclassof for a datatable?

Oh nvm I see

@lament flax our asset ids for item definitions are type:assetname for example Weapon:wid_ranged_blah

Where wid_ranged_blah is the asset name.

One thing I haven't managed to do is handle renaming without breaking stuff

But it can be done with redirectors manually

[lament flax]

okay

[meager spade]

The type is determined by the item type tag

But ours is done via a lookup cause we can't grab it from the tag directly

We originally had an enum but dropped it

[sturdy sand]

Quick question. Is it normal that I'm getting bad latency using mover between clients?

[blazing bear]

Hi, should integrating the OSS (steam) to the game be done as early in development as possible or can it be done whenever?

[meager spade]

There is an issue if your using iris

If your not using iris I have not seen that though if your using 5.4.3 or less then there is issues 5.5 addressed a lot of them

But mover is still highly wip and will be more stable as they start to transition fortnite to use mover

[sturdy sand]

I'm using the released version which I think is 5.4.3 if I'm not wrong. I was planning to move mover files from 5.5 to the engine I currently have.

Or are there some other files I would have to move?

[proven pagoda]

In the FFastArraySerializer there's 3 functions PostReplicatedAdd, PreReplicatedRemove and PostReplicatedChanged but I'm struggling with finding timing for PostReplicatedRemove.... I want to trigger logic whenever an element is removed on clients in a repnotify essentially. There's timing for after it was added and before it was removed. The PostReplicatedChanged doesn't fire logic in the add or remove situations, seemingly just when the same index had values changed. Where could this best be handled for the timing of after the array had an index removed on clients

[thin stratus]

Honestly, if you don't have a really really really good reason to use Mover, don't do that. We've been using it for a while and it requires A LOT of custom code on both Mover and NPP to get that thing going. Stay with CMC if that allows you to do what you want to do.

[sturdy sand]

Well I'm aiming for client-side prediction and I understand what you mean but I'll keep using mover and I'll figure it out somehow.

[thin stratus]

CMC has Client Side Prediction though

But yeah, you can of course do what you want. Just an early warning :P

[sturdy sand]

I know that CMC has it as well but CMC doesn't have the features I want and I also simply want to figure out how mover works

[thin stratus]

CMC doesn't have the features I want
Which features?

[sturdy sand]

Lack of compressed flags

Either way I'm moving to mover. It's nice that the client-side prediction is easier to setup on mover

[thin stratus]

You mean you don't have enough flags for Inputs, like Crouch?

[sturdy sand]

pretty much

[thin stratus]

CMC uses Serialized Containers for quite a while now, which allow to send whatever data you need to the Server, including a bunch of additional flags if needed.

Just fyi of course.

"A bunch" meaning "as many as you need"

But yeah, try out Mover. It's a cool concept. I hope they can get that production ready over the next 6-12 months :/

[sturdy sand]

I'll be very honest with you I don't even know what I need lmao.

[thin stratus]

That's all good. I mainly wanted to warn you about how experimental it is and how many Engine changes it requires to get NPP and Mover to actually work properly.
I've been doing nothing but NPP and Mover coding for the past 6 or so months.
I'm currently patching it up with RootMotion support, cause that is also still too experimental on ue-main

[sturdy sand]

Yeah I knew that before even starting out with mover.

This was a while ago but here is the reason to why I moved to mover

[thin stratus]

Yeah, problem is more that it lacks tons of features that CMC has.

[sturdy sand]

It's fine. I'll just wait and work on other things and constantly pull mover files from 5.5 to the engine source I currently have and I'll work with what I have.

[blazing bear]

How can I stop an unfocused standalone instance from being very low fps?

for example, a character moving on the screen looks very laggy as if there are replication issues, but the moment I quickly tab out to the window that was looking at the character, the character becomes smooth instantly. So that's how I know an unfocused standalone window is having very low fps

I'm sure this is normal since the gpu/cpu needs to focus on the window used. But I'm wondering, what's the best way to debug your game so its results are as close as possible to its packaged version? I've heard it's by using standalone windows instead of PIE, but now I'm struggling with this problem that doesn't exist in PIE

[cloud crown]

Hey why my server is sending montage across the server to the Sim proxies only

[fossil veldt]

wait really? I thought that it was still limited to 8

well 4 - but 8 if you're daring to use the reserved flags

[thin stratus]

No, it uses CallServerMovePacked by now.

// Get storage container we'll be using and fill it with movement data
FCharacterNetworkMoveDataContainer& MoveDataContainer = GetNetworkMoveDataContainer();
MoveDataContainer.ClientFillNetworkMoveData(NewMove, PendingMove, OldMove);

You can specify your own child class of that

DEPRECATED_CHARACTER_MOVEMENT_RPC(ServerMoveOld, ServerMovePacked_ClientSend)
ENGINE_API virtual void ServerMoveOld(float OldTimeStamp, FVector_NetQuantize10 OldAccel, uint8 OldMoveFlags);

That's the old one.

[fossil veldt]

oh shiet

yea i've been inheriting FSavedMove_Character and using the compressed flags

hm

[thin stratus]

I mean you gotta do that too.

The point is that it's not a hardcoded uint8 param o nthe RPC anymore.

[fossil veldt]

gotcha ok

[quiet yarrow]

So im having a physics replication issue. Im trying to figure out if this is a limitation of replicating a large amount of physics objects colliding or if I just need to adjust some replication settings.

Any additional objects added to the 25+ physical objects inside of a wagon things dont like to replicate accurately. These objects are owned by the client who is hitched to the wagon. After some tests any object over that ~25 threshold freeze in the air randomly from the hosts perspective and slowly update position suddenly.

i've been trying to use a network profiler and stat.net but im not sure what I should be looking out for

[daring egret]

you're likely flooding the pipe, unreal stock physics rep never was that good to be honest, you generally need something a bit more custom to replicate higher amounts of physics objects. maybe take a look at fast array and have a manager actor replicating locations and velocities

[quiet yarrow]

Im using SmoothSyncs replication, but I doubt thats built for a large amount of physics objects either. Sadly not a lot of documentation with that either. I'll look into that. Any recommendations on some documentation that goes over fast array?

[daring egret]

i haven't used that so i'm not really sure if it's any good for this - but sounds like the answer to that is likely no

re fast arrays: https://vorixo.github.io/devtricks/network-managers/

probably that blog post is ur best bet

[dark edge]

I like launching from a script

you can do that without packaging

but you can't really smoke test the game without multiple computers IMO

For example

Haven't used it in a while obviously but you get the picture

[blazing bear]

I also launch like that sometimes! -nosteam seems cool I wasn't aware of this one, I guess I don't have to exit Steam now with it

[blazing bear]

yeah it's the best way, but in the meantime, before packaging to test with multiple computers, do you use PIE or standalone?

[dark edge]

I'll fire up PIE for quick checks but for more thorough tests I just launch like this. It's the same as standalone I'm pretty sure but without the editor involved

[blazing bear]

Don't your unfocused standalone window experience severe lag though?

[dark edge]

Don't recall, I usually test with multiple computers

There's ways to reduce that though, look in settings

Use Less CPU in Background

[blazing bear]

Yep I tried all of those but unfortunately I still have the problem

but it's fine

I'll try testing with multiple computers

obviously the best way

[meager heart]

Anyone ran into this before? It looks like my character has the wrong player state assigned to it, unless I'm misunderstanding something

This would check out with some of the other errors I'm running into with the GAS, but I have no idea why this would happen / I thought this was something handled assigned/automatically

This function is running from my OnRep_PlayerState() function, which may actually be the issue (though I don't necessarily understand why)

[lament flax]

i think it depends if the id is local or not

i remember cases where my listen server would be character_0/1 and my client being character_0/1

[meager heart]

Hmm that may be something I can check

The issue I was running into with the GAS was that actors were sharing the same attributes (which are stored on the playerstate), so this initially seemed like evidence that they could be sharing player states

However after removing this function from firing during OnRep_PlayerState() it looks like my characters aren't being assigned any attributes, so maybe this isn't the issue

[primal summit]

Does anyone know what would cause a map to fail loading on a server, and insisting to try to load a map I do not have selected as the game's map?

If I remove said map, it always tries to reference it and then fails (says cannot find that map), and I've also tried to open the map it wants, and then switch to the other map, but it still fails

[prisma snow]

I was experiencing this recently - PIE works but Framerate is super low (~20FPS) and if I launch standalone, non-focused window runs at <8FPS AND some of my replication (but not all) has inmense lag (like 1-2 seconds delays with 150-200 ping)

[blazing bear]

PIE will naturally have lower fps than the packaged version because you're also running the engine + IDE if it's open. But yeah unfocused standalone window is a pain, glad I'm not the only one.

[prisma snow]

yeah ofc, I expect it. For serious testing I would use 2 computers, but I only have one atm xD.
The standalone thing was crazy though, I still haven't figured out the lag. Need to try with two computers soon to ensure it is an engine thing and not the game itself 😅

[blazing bear]

yep! I also only got one computer, for now at least. having two would be really useful

[vague spruce]

anyone know how to cleanly disconnect players from a server? such as when kicking them?

i have this:

    if (NewPlayer)
    {
        if (const auto Conn = NewPlayer->GetNetConnection())
        {
            Conn->Close();
        }
    }

but it doesn't exit me out of PIE. i guess that's intended? but it makes me think i'm doing something wrong

this worked:

    UKismetSystemLibrary::QuitGame(GetWorld(), NewPlayer, EQuitPreference::Quit, true);

but i'm wondering if this will close the game for players in the shipped client

[verbal ice]

If you need to kick players there's a KickPlayer function

In the GameMode or GameSession I think

[verbal ice]

GameSession::KickPlayer

[unkempt tiger]

Anyone know how online multiplayer only projects can upload their build when applying for a megagrant?

[daring gorge]

if you are using 5.3/5.4 theres something called as physics prediction, im having the same issue however im using 4.26 so ill be sticking with smooth sync for now, usually people simulate physics locally is what ive heard which is what smooth sync is doing, however it gives client authority for movement so not best

https://vorixo.github.io/devtricks/phys-prediction-use/

[stable marsh]

How do I send info from a widget/hud on a client to the actual client's player controller? It's only sending to the local player controller.

This all works for the server/client on server, however for the second player (and I assume any clients), Get Owning Player does not access or update the client's player controller. I can't seem to get the correct Hud when I do it from within the player controller either. I am trying to spawn a unit based on the UI button that is clicked (btn1 spawns unit type 1 for intended player, btn2 spawns unit type 2 for intended player, etc...)

Image is from within the Widget Event Graph. Unit Int is within the PlayerController.

[vague spruce]

appreciate this. i'm wondering why in PIE it doesn't do anything

there's also this NewPlayer->ClientReturnToMainMenuWithTextReason(FText::FromString("Character invalid."));

but it causes a gnarly crash

[stable marsh]

Maybe a better question... how do I get the local player controller to talk to the client player controller?

[plucky prawn]

is there a way to get the client a function is running on? for example on an input event i want to get the local player controller that that input was triggered by, but also more generally if theres a way to get the "local player" that is executing the event/function

im using Get Player Controller (0) which... works

[verbal ice]

That always works

If it's to get the local player controller that triggered input

[plucky prawn]

even in splitscreen?

[verbal ice]

That might change yes

What are you trying to get it from

[plucky prawn]

i just need the player controller so i can pass it along to other functions which eventually call RPCs on the server

[verbal ice]

Yeah but what's the input being handled in

[plucky prawn]

just a normal actor since enhanced input lets you do that

[stable marsh]

How do I set a variable without rep w/notify so that it actually replicates?

[plucky prawn]

set it to replicate instead

[stable marsh]

Not working lol

I've been banging my head on this for a while now and haven't had any luck

[daring egret]

have you put the macro in lifetime replicated props?

DOREPLIFETIME ?

it's not enough just to mark the uproperty as replicated you have to specify a replication lifetime

[stable marsh]

I'm not sure I know that property (function?)

Oh, where can I learn more about that

[daring egret]

https://dev.epicgames.com/documentation/en-us/unreal-engine/replicate-actor-properties-in-unreal-engine

check out the part with GetLifetimeReplicatedProps function override

you need that otherwise it's not going to replicate

[plucky prawn]

assuming they are using C++

[stable marsh]

Ah, I'm using blueprints

[daring egret]

oh i'm really sorry i didn't realize

[plucky prawn]

what are you trying to replicate and how?

[daring egret]

it should just be a case of setting the "Replicates" checkbox in the class defaults and then setting the "Replicates" on the property itself

in blueprint it's much more automatic

have you set your actor itself to replicated actor?

[stable marsh]

I have two players, each with their own hud. They are able to spawn units, with correct color, etc... Anything I've called regarding replicate, I've had to use Rep W/Notify (and worked). I'm running into a problem where I need the execution to come not from Rep W/Notify. The variables I'm replicating just aren't remembering (or updating on the server) correctly.

On the hud I have unit buttons that when clicked, send an int to updated the unit type. The unit type is udpated on the respective player controller and set with "replicated". It doesn't seem to be retaining that information

I believe so yes, I've set my players (player controllers) as replicated* and assigned them to an array in my GameMode event graph

[plucky prawn]

you cant replicate to the server. if you want to set a variable on the server you need to call an RPC (server replicated in this case) which updates your actual replicated value which will automatically replicate to clients

[stable marsh]

So should I be moving my "Spawn Unit" script from occuring on the player controller to the game mode graph?

[plucky prawn]

depends where its called. if your Spawn Unit event is called on the server it probably doesnt matter much

if you can spawn units from player A and they show up on player B then its being called on the server

[daring egret]

the server really should be doing that anyway

unreal is server authoritative by default so you want to be making server in control of the gamestate

is this for rts to spawn units from a building?

[stable marsh]

Spawning from player click - after they've selected a unit type.. think Clash of Clans I guess?

[daring egret]

i see, you should do as gambit suggests then and have a "request unit build" RPC to the server

then the server checks the players resources and validates if you can do the action, then spawns the unit

client just says "hey i want to do this"

[plucky prawn]

the RPC stuff is a bit round-about but its for the best. your server needs to be the "source of truth" so you need to make sure the server knows whats going on. you shouldnt have clients knowing stuff the server doesnt

[daring egret]

if you're being good, you should basically not let the client ever tell the server what to do - only what it wants to do

[stable marsh]

Okay I get what you're saying but I don't get what that means - I'm getting caught up on where the server "exists" within the structure of these events. Dumb question but what is RPC(remote procedure call) if not me identifying a variable as "replicated" etc...? Are there unreal graphs/classes that act as the server (like Game Mode?)

[daring egret]

an RPC is quite simple - it's literally just a way of letting you remote execute a function on a machine that isn't yours

but replication isn't the same, replication is one way it trickles down from server to clients only, not the other way

[plucky prawn]

think of it as a message to/from the server which triggers an event

[daring egret]

RPCs are bidirectional client <-> server

[daring egret]

the caveat of this is - they are executing remotely on your machine, therefore you need to make sure it's safe

that's why you ideally never let a client be imperative over the server directly, like telling it to change some state

but instead you just use it as a way to say, hey this client wants to change this state or do this action

then the server goes - hm is this actually allowed, ok it is, i'l do it np

you can optionally just not care about security at this point and just RPC to change the state directly, but it's bad practice because any client can hack and spam RPCs at the server telling it to do whatever they like

[stable marsh]

Okay I misunderstood Replication with RPC. And I get what you're saying about the communication now (handling changes that the client can only REQUEST).

[daring egret]

yes precisely

[stable marsh]

It doesn't seem like that's in Blueprints? Unless that's the Game Mode class I was talking about?\

Or Level Graphs (whatever the main equivalent is, sorry I'm still relatively new to this)

[daring egret]

it is in blueprints, it just depends who owns the actor or not, gamemode is owned by the server

[stable marsh]

Okay that's the phrase I was looking for "owned"

[daring egret]

https://cedric-neukirchen.net/docs/category/multiplayer-network-compendium/

you should read this

i believe it will be very helpful to you

[stable marsh]

Thank you for all of the help already, I'll definitely take a look

[plucky prawn]

this is an implementation detail though. theres nothing stopping you from letting clients dictate state on the server so you need to actually do your own validation to make sure that a request is valid

[nova wasp]

RPCS are a user defined payload of data that can target an object instance that unreal lets you define as simple UFUNCTIONS. This is mostly for things like the client calling ServerDoThing(thing) in a replicated object they own (pawn/controller) on their machine and that turns into a payload of data + target across the connection that calls ServerDoThing_Implementation(int32 thing) with the passed in data on the server's replicated version of that object

This is the most direct way you have to easily send information from client to server in unreal's game framework. Replication of object instances and their replicated properties is only server->client

RPCs can also be from server->client or multicast (server->all clients)

[daring egret]

you're most welcome ❤️

[plucky prawn]

they are using blueprints bruh

[nova wasp]

ignore the funny letters then I guess, sorry

[daring egret]

@stable marsh https://cedric-neukirchen.net/docs/multiplayer-compendium/framework-and-network

[nova wasp]

replace UFUNCTIONS with BP events I suppose

[daring egret]

specifically this page will be really helpful

important image

[plucky prawn]

its ok i understood 🙂

[nova wasp]

I know you did, I'm just trying to get across how "simple" they are in a generic sense that they are just "send this data and call a function/event on an instance when it arrives" but I got caught up in C++ examples

[stable marsh]

Okay thanks all, that's extremely helpful and I appreciate the time

[daring egret]

good luck ❤️

[stable marsh]

Okay sorry to already come back with this but I feel like I'm missing something still.
I have this event - which I assume is the RPC (and which I've tested each "Replicates" flag to no avail)

Which calls this function:

The spawned unit takes that same variable but does not remember it here (except on the server player)

[plucky prawn]

multicast is a special type of RPC which you should not be using for state but rather special effects

[stable marsh]

Sorry I've tried multi, server, client, etc

no changes

[plucky prawn]

what do you want this RPC to do

is it designed to be called from the server to each client?

[stable marsh]

I want it to update the unit type that is allowed to be spawned for the client that requested it

So it works for player 1 (server), but player 2, after they've selected their unit from the ui, the spawn (which is a separate event based on mouse click) doesn't recognize the unit type

The spawn event is this:

---

[plucky prawn]

so... you want to update some state on all of your players

[stable marsh]

I want to retain the Unit type variable that was changed... so yes?

[plucky prawn]

this gets a bit scuffed because by default you arent privvy to all the player controllers in the game which you will need

you can make your own list in the gamemode class since it has the events to do this

actually

is this on a player or non-player-actor?

[stable marsh]

So I do have this:

[plucky prawn]

right but is it a player pawn or nah

oh i see what you are doing

[stable marsh]

Sorry, the last image just posted is on game mode setting the players. It's a player controller that executes the spawn, etc..

The unit itself is a pawn

[plucky prawn]

this is like a selection menu thing and you want to disable options that are chosen by another player

or i cant read

[daring egret]

or just get player array from the gamestate

[stable marsh]

Here's the actual view if it helps:
Right screen (player two) should update the unit to paper - it stays the default unit instead (because that selection didn't propagate)

[plucky prawn]

that doesnt work if you need to send an RPC to the player controller

[daring egret]

why not