multiplayer

[sinful tree]

Yes

[grand stratus]

yeah they are all using same character bp

so what can i do?

only rpc in gamestate?

[sinful tree]

In the editor, add the niagara component to your pawn, and set it to not auto-activate. Make sure to set the particle effect you want to use in it.
Place your input command on the Pawn rather than the player controller - this way you'll be on an actor that everyone knows about, and have an easy reference to where the actual effect should spawn.

If you want to prevent others from using it, then you should store a boolean in gamestate that you can turn off and on while running on server. The server should check if this value is on or off when someone attempts to activate it, and if off, then proceed to allow activating.

How you tell all the clients to activate it will need to vary based on your needs. You can multicast RPC it, but that means anyone that wasn't near the character that activated won't see the effect. You may want to use a replicated boolean (with the RepNotify option selected) or some other means of storing the state and when setting it the effect will be activated/deactivated on relevant clients.

Whether an RPC or through the OnRep function, when you want the effect to activate, grab the reference to the Niagara component and activate it (see screenshot).

[grand stratus]

that is a great idea

but the effect runs on a actor in the scene

so i can add the niagra effect to this actor

[sinful tree]

Sure

In that case, make the bool on the actor itself replicated w/ OnRep.

[grand stratus]

okay

but the niagra effect life time should be forever

so i can activate and disactivate it all time

i ticked this one

if iam near to the sever

as a client

i cant see the effect

but as the serrver i can

do i need to replicate the actor itself too

or just the effect @sinful tree

[dawn glen]

How hard would it be to have a game world that people play on a dedicated server and then have a level where they can build their home in that allows other players to join? So you would be able to go back and forth between connecting to the multiplayer server and disconnecting to go to your local home base but have it turn into their PC into a listen server for their friends to be able to go to their home?

The dedicated server stuff is easy, i have a back end API that puts you into the online game but im not sure how to handle the bounce back and forth and also making it so the game changes from client to client server for friends

[sinful tree]

Yes, the actor should be replicated

[grand stratus]

@sinful tree i did this but also other players can not see the effect

i did not do any multicast yet

but i thought the replicate would make it work

[sinful tree]

You either have to use the OnRep of a variable or a multicast I believe. Replicating the component doesn't appear to work on my end either.

[grand stratus]

what should i multicast

the activation only

?

@sinful tree

[sand iris]

can someone explain what do these 1 and * (asterisks) mean in this diagram from the network compendium?

[sand iris]

Also, why does AGameMode::ReadyToStartMatch have a AGameMode::ReadyToStartMatch_Implementation() function?

Aren't _Implementation() functions only for RPCs?

[terse talon]

You can read it as:
1 gamestate can contain many player state
1 playerstate contain 1 playercontroller
...

[terse talon]

Can't recall what ReadyToStartMatch is, but _Implementation is user also for BlueprintNativeEvent and maybe other stuffs that I can't recall right now

[sand iris]

Ohhh I see, that makes sense thanks! Is there a reason why there isn't a line from GameMode to PlayerController to show that many PlayerControllers can be referenced by a single GameMode? or that's not how it works?

[sand iris]

ohh I didnt know, that makes sense now, thanks!

[terse talon]

I think it was drawn like that because GameMode only exists in the Server, and it already references a GameState (that references many PlayerState that thus references PlayerController)

[sand iris]

ohh I see, thanks again!

[harsh lintel]

I'm changing the scale of a replicated actor on the server but it isn't being replicated to clients

[elfin sail]

how can test dedicated sever without packaging build

i have two levels first login to game play

Currently I have to create server build which time taking and slow

any suggestions ?

[empty axle]

the scale is replicated together with the whole transform of the actor which is replicated only if you enable movement replication

if you are not planning to replicate movement then I would just replicate a separate variable with scale and react on changes of it client side

[empty axle]

do you need to test seamless travel? Because if NOT you can just do that inside editor

[elfin sail]

who i can don it in editor

[empty axle]

If you are asking how then just select "Play as client"

[elfin sail]

i think i have to tell the server level

to launch

[rough jolt]

How can I get rid of this stuttering when playing as the client? https://gfycat.com/importanthilarioushairstreak

[empty axle]

that would start current level on dedicated server

[elfin sail]

nah

[empty axle]

yes

[elfin sail]

i want to from login which is not server level

i did it a years ago

in advance setting we have to tell the level to launch for server

[peak sentinel]

Which movement component are you using?

[empty axle]

did you tried to start editor in game mode from console command

[elfin sail]

done

[empty axle]

client command PATH_TO_UE4Editor.exe PATH_TO.uproject -game -log
server command PATH_TO_UE4Editor.exe PATH_TO.uproject "PATH_TO_MAP.umap" -log -server

with commands like that you could start a client and a server separately without packaging

[elfin sail]

yes was looking for something like this

but you can set it these commands in editor

like uncheck single process and add name for server and play as standalone

it start server separate and client

this same what you are saying

thank you so much

[rough jolt]

none. It's a custom pawn.

Should I be using any? Sorry if i'm a bit clueless my first game from scratch and google wasn't helpful

[peak sentinel]

So CharacterMovementComponent handles lag compensation for you

But any other movement component does not

Each actor has a replicated transform data, and a velocity, those values updated based on your net frequency via an OnRep

Between updates, especially if you are controlled pawn, there can be latency

And that latency can cause a jitter

[rough jolt]

should i just slap one of those into my airship? i didnt because i thought they came with their own controls and stuff

[peak sentinel]

You should write a new from scratch

CharacterMovementComponent is not suitable for player-controlled ships imo

[peak sentinel]

That requires C++ and a good knowledge about replication

There is a free course in learn.unrealengine.com about multiplayer, at the last section they cover how to make a replicated pawn movement component

You can use it as a reference, but dont do what they do, because it sucks

It would be a good starting point

[rough jolt]

then I can't

Is there anywhere I can download one?

[peak sentinel]

I dont think so

[peak sentinel]

You can download their implementation but it will not work alone

You wont get airship controls

[rough jolt]

underestandable

thanks. i'll look into it

[peak sentinel]

#cpp message

You can start reading this chat

There are some key points for making a movement component there

I also shared the link of the course

[rough jolt]

Thank you

[elder sage]

What should I be using to communicate to the server/host that a player died, and then to each player from there?

[empty axle]

server should decide that player dies in the first place, from that point you can set some replicated bool to indicate that the player is currently dead

[rough jolt]

Is there a way to replicate animation blueprints? i got the movement down but both pawns follow the state machine of the client it would seem

once again, google didn't help me much, probably because i lack technical knowledge so idk what i'm exactly looking for

i already set the variable to repnotify and it didnt change anything

because it seems follows the client's poses (since they're two of the same class)

Like the other ship will always copy your ship's animations

even if the variable i'm using is set to repnotify

it's not affected, but it still looks shitty when all other ships are landed in the air because yours is landed

are there any tutorials for that?

i already got the transforms all down

i'm talking about animation blueprint

landing gear, wing orientation, all that

the bones

[sharp pagoda]

Hello everyone! I hope you guys have a nice day.

I'm having a problem with basic setup of multiplayer. The pawn is replicated but the client can't see the server's pawn and vice versa. I have two unmodified Player Starts and can confirm that the server uses the first one while the client uses the second one. What should I look into first?

I'll look into it. Thanks Lorash 🙂

[rough jolt]

@twin juniper I am following this tutorial but the problem he's having isn't the same as mine

https://www.youtube.com/watch?v=z7DI17JAGQM

in his un-replicated version the animation just happens on the client not on the server

so when he crouches none of the other clients do

for me when i crouch all the other clients do even if they aren't crouching in their screens

and idk what to do

misuse in what sense? i've been trying things but i dont even know where to start 😔

:O

[elfin sail]

player state pawn

playerSate->GetPawn()

always null

any idea why is that

[sharp pagoda]

Unfortunately, watching this didn't solve my problem. 😦

I've tried line tracing from the center of the pawns to (0, 0, 0) and I can see the line trace of the other, but I still can't see the other pawn.

The pawn at the end of the red line is that of the server's

Here is the pawn's constructor:

[lament minnow]

i'm having problems with UpdateSession when trying to change session property's. the host correctly see the changes, but anyone searching for sessions does not see the new key(in fact the key is now empty, instead of what it originally was set with).

void UMultiplayerMenu::GameNameTextCommitted(const FText &Text, ETextCommit::Type CommitType) {
    auto gInstance = GetGameInstance<UBrickBreakGameInstance>();
    if (!gInstance->SessionInterface) return;
    if (Text.ToString().Len()==0) return;
    auto Ses = gInstance->SessionInterface->GetNamedSession(ActiveSession);
    auto SessSet = gInstance->SessionInterface->GetSessionSettings(ActiveSession);
    SessSet->Set(NameKey, Text.ToString());
    bool bRes = gInstance->SessionInterface->UpdateSession(GameName, *SessSet, false);
    UE_LOG(LogTemp, Log, TEXT("Changing name: %s - %d"), *Text.ToString(), bRes);
    return;
}

this is how i'm setting the new NameKey which becomes blank to clients when searching for game's.

nvm, i forgot to set the advertisment flag on Set.

[quiet fjord]

Guys how can I fix the rotation shake on the client when I rotate in find look

this is my blueprint

[obsidian spruce]

Having trouble changing a player's max acceleration, can someone help please?

"Acceleration" is a float curve

I want it so the faster you go, the less you can accelerate

Currently it seems like the server rollsback clients as if they are going too fast but the Max Walk speed limit is set really high (i go faster when playing standalone)

[timber lion]

Hey guys, i think i got a simple question but I can't find a solution on google. 😅
When I open a level my Player Controller gets switched out for a new one. How can I retain data in variables over connects/disconnects?

Like I got a string variable for a access token for my API backend and I dont wanna loose that on server connect

[dark edge]

Why is that event called SetMaxSpeed but it sets acceleration?

Also that will never work flawlessly in multiplayer. You need to do max speed changes through the move system in the CMC, and that needs c++

[sinful tree]

You store the value within your GameInstance.

That being said, you may not necessarily want your clients accessing your API directly, unless of course you're running listen servers then you don't really have a choice.

[obsidian spruce]

You're right i corrected it

[obsidian spruce]

Ok i really didnt know how to handle the problem thank you. But why couldn't i do what i did but change MaxWalkingSpeed in Blueprint?

[sinful tree]

The issue comes down to how the CMC is replicated. In Blueprint you can still do it, but you'll either have jerky movement due to the server correcting the position of the player, or, your player's speed won't increase until the server's replicated the new CMC value back to the client, making the speed increase input seem slightly lagged.

[obsidian spruce]

And in c++ it would be different? Can you maybe recommend a resource where i could learn more about that? I try to make a complexe movement system with varying max speeds, speed boosts, dash etc

[sinful tree]

And you'll be wanting to modify the CMC in C++ to do so if you're making a multiplayer game. This video, while a bit long, I think explains it very well and goes over both sprinting and a basic wall-running example. https://www.youtube.com/watch?v=RtQRMcupJs0

[obsidian spruce]

This looks like exactly what i need, thanks a lot kind sir

[sinful tree]

The one thing I think he doesn't do well in that video is how he simulates lag - you don't have to put it in the .ini - you can use a simple blueprint to do it:

[timber lion]

ohh I read about the "game instance" but never guessed that it was a blueprint
i see i can set it in my project settings, so i should create a custom one?

[sinful tree]

Yep

[timber lion]

ok thanks!

also don't worry about the API, it's ment to be called from the client

and that oauth2.0 access token has only read scopes 😉

[elder sage]

so when I'm trying to message my controller to tell the relevant player that they got a kill or died, what can I do to select only those players? I can get a reference to the dead player because this function follows their death sequence

[obsidian spruce]

Thanks a lot this is precious advice for a newbie like me 😄

[twilit radish]

You can also do this when starting to play the game with the "Advanced settings", but that depends on if you want to have a toggle or not I guess 😛
It does have more options, but I assume those are also accessible through commands.

All the way down at the "Play" button:

[elder sage]

I need help creating an event that fires whenever a player dies, to add score to the player who killed them. I'm not sure if I should use a multicast function after running the death function on the server or not

[violet sentinel]

check shootergame

usually just update player state or game state on server and let it replicate to clients after

[elder sage]

you can message player states from the server?

[violet sentinel]

ofc

game/player state are on server too

[violet sentinel]

#multiplayer message

[elder sage]

am I missing something about how player states work? I thought that there would only be 5, one for each client and then the two of the clients that are replicated by the server

[eternal canyon]

or use the command console or in the editor preferences in the play tab

[sinful tree]

A copy of each playerstate exists on each client and server.

[elder sage]

that's because it's replicated to all?

[sinful tree]

Correct - playerstate is replicated to everyone.

[elder sage]

I'm trying to get a simple score UI working, and I'm noticing that the client I'm firing the event on and the server are both getting the event to update it, but they're both adding twice instead of once, and the other client does nothing

it might be because I'm using an onrep function for the score variable, actually

also, the variable seems to set itself back to 1 after getting the second kill, so I have no idea what I've done wrong at this point

[dark edge]

Where does score live, GameState or PlayerState I'd assume?

[elder sage]

playerstate

the two I've highlighted are my score updating twice per kill before being sent to the ui

should I not use on replicates for a score and just do a slow tick or something?

[dark edge]

Repnotify is fine.

[elder sage]

ok

[dark edge]

You're not ALSo doing a multicast event as well right?

[elder sage]

😳

I'll try client-only

or norep I mean

same deal

the circled one runs immediately after checking health in onrep health

death sequence is only things like ragdoll and changing visibility for certain things

[dark edge]

@elder sage it should be as simple as updating score on server side and using onrep or binding the widget

Start with binding, it is performant enough.

[elder sage]

the issue seems to be that the variable is being updated twice, so I should run that only on the server, for the relevant player(s)?

[violet sentinel]

with 3 clients on listen server mode: 3 on server 3 on each pure clent (2) = 9 total

[dark edge]

It's probably updating on server then updating on client

[violet sentinel]

ofc, always update replicated data on server only

[dark edge]

@elder sage show how you're updating the score variable and then updating the UI

[elder sage]

the score is the one called "kills" in that previous screenshot, and then I do this

the rest is just setting text in the widget, which I'm fairly sure I have right

picks text block based on team

[sinful tree]

I see what's happening -> The "Player Died" is executing on server which is calling the multicast event (which also executes on server). Since it's a multicast, it'll execute both on the server and will properly execute only on the character where the "Get Controller" is valid.

So the player is adding 1, as is the server.

[elder sage]

so I should just put the score update on the previous event because that's server-only?

[sinful tree]

Yep

[elder sage]

so now only kills from the host player update the score twice for all players

clients work correctly, server does not

[sinful tree]

Ideally, your flow should be something like:
ON SERVER:
<something> is dealing damage to <player character>
<player character> health - damage
if <player character> health <= 0 set dead state, add score to <playerstate who instigated the damage>

[elder sage]

so I use event anydamage and then put my health reduction and health check in onrep health, is that not ideal?

[sinful tree]

Definitely not.

Your server should be setting values.

OnRep can be used to control what happens when those values are set - like updating UI

[elder sage]

I thought this node was server only?

[sinful tree]

You said: "put my health reduction and health check in onrep health"

Which executes on all (or at least any relevant actors at the time)

[elder sage]

so I should make a server-only event after that node, then?

so is that more like what I should do?

[sinful tree]

AnyDamage only executes on the server. Anything that follows after it will also execute on the server.
If you are setting a variable that has a RepNotify, and then doing additional calculations within the RepNotify you're doing it in the wrong place. The calculations should be taking place on the server and values set on the server. The RepNotify can then be used on clients to update their UI only - not changing values again.

[elder sage]

I think that fixed it

I'll probably have more questions in a minute lol but thank you

[elder sage]

so if I'm trying to determine and then set the color of each player based on their team, how should I configure that? I'm currently running into an issue where the server player and the local player change color, but no non-local clients do.

actually maybe I figured it out

nvm, needed to rpc the server to run the multicast

[sinful tree]

Don't use RPCs to replicate state. Use RepNotify variables.

If you have only two teams, then it can be as simple as a boolean being turned on or off, with the default off being one of the colors.

If you need more than that, then you'll need to use an integer or, an enumerator.

[elder sage]

I'm already using an int

so you're saying that I shouldn't put this function on an rpc at all?

[sinful tree]

So when you set the int for the player (guessing on the playerstate) that OnRep is where you'd set the colors.

[elder sage]

but the character isn't necessarily spawned at that time

I was running into racing issues doing it the way you said because players join teams before the character initializes

[sinful tree]

That shouldn't matter - if the playerstate is given a value, then you can read from the playerstate when the player is spawned.

[elder sage]

so are you saying I should set my color and everything when teams update?

part of the point is I want to compare so that players that match the local player are blue

[sinful tree]

What I'm saying is, use a variable on playerstate to hold the state of the team they are on. Make it RepNotify, and if the player's team changes, you can update their color through the OnRep.

If the player's character isn't spawned yet, that's fine - when you spawn the character, then you read the playerstate for the team value and set the colors.

[elder sage]

so I'd still create the dynamic material instance after the character begins play?

because I need a component object reference in order to set that material color, and that can't happen until the character exists

also, the color needs to be set for each character because that's not actually based on the team you're on; all that it should check is what team matches the local player's

[sinful tree]

Sure, but read the playerstate for the team value.

[elder sage]

I guess I don't get what point I'm supposed to change here. I should start my event when the teams update instead of when the players start?

[sinful tree]

Whenever you are wanting to set the team value, set it on playerstate. In the OnRep of the team you can check to see if the players character exist and display the colors necessary. If they don't exist yet, that's fine - when they do (such as on the begin play), you can have them check the playerstate for their team value

[elder sage]

I'll try that. How would I ensure that I'm comparing the local player's team variable to each character's though?

[sinful tree]

Get reference to the local player's controller/character so you can reference their playerstate and get their team value.

[elder sage]

Is it just "get local player controller"?

[elder sage]

Teams are assigned and the cast to the player happens right after, so the players aren't created by the time it tries to assign a color

so it actually only works for the local player, and not any other

actually, only non-server player can see theirs and no others

[twin juniper]

what would be a good place to call my autosave and associated funcs? I noticed ARPG template has it on GameInstance, but it's not intended for multiplayer. Maybe PlayerState would be proper one in this case?

[sinful tree]

That's because you're using this call here. You're referencing only a single player character and that'll always be the local one.

[elder sage]

so how would I reference that?

from the game state?

I made this change to it and now doesn't change any player colors

[sinful tree]

Game mode doesn't exist on clients.

[elder sage]

game state does though?

[sinful tree]

Yes

[elder sage]

I'd have to go from the game state's array of player states to a controller or pawn for each one in order to cast to my character

[sinful tree]

Within playerstate, there's this variable. It contains the pawn that is controlled by the playerstate.

[elder sage]

pawn's privates 😳

I'll try it

[sinful tree]

And you're still doing multicast RPCs. Don't do that for this.

Use replicated variables.

[elder sage]

seems like it works now

[vast yarrow]

Hello, I am new to video game development and I am creating a test online multiplayer, I have a problem and it is that I cannot replicate the sound of the server in all the clients, does anyone have any idea about this? thanks in advance. Sorry for my English

[elder sage]

I know that the server needs to tell each client to play the sound on their own @vast yarrow

[sinful tree]

The idea is that you're receiving the replicated team variable from the playerstate's OnRep - that function is then called on all clients when the value changes. Within the OnRep function you can reference the Pawn Private and set the color on that Pawn Private based on the new value of the team variable - as we're running on client, it'll happen on the local client that received the OnRep notification, so that client will see the color change.

[elder sage]

I just plugged the onrep straight into the color function and that function is also called on beginplay in a character

idk how you test join late in unreal but I don't see what issues would be caused

I'm torn between running my line trace on the server for an authoritative system or running them on the client for a more consistent feeling

[vast yarrow]

Yes I try but I don't know how to do it

[elder sage]

all that's relevant is what's highlighted

so basically, client asks server if it can fire, server instructs the client to fire, server tells everyone to play the sound

[vast yarrow]

I did that but it didn't work for me.
I'll explain what I have done: first what I do is start an animation of an object on the server (as this has replica seen on the client) at a certain moment the object plays a sound, I created an event for that sound as you showed me in the image but it didn't work for me

[elder sage]

you have to make sure you're running an event on the server from the client, and then multicasting it from the server

seems redundant but it's because the client can't tell everyone to do something

[vast yarrow]

The event that starts the animation is in BeginPlay and with the "switch has authority" in authority. I don't know if it has something to do with it

[elder sage]

is this a spawn animation or something?

switch has authority just means it checks if it's the server or host player who's playing the node, so it already only runs on the server

just make a multicast event that plays your sound

yeah so your client isn't being told to play the sound

[vast yarrow]

how would that be?

[elder sage]

you make a custom event and change its replication to "multicast" so that the server will tell that event to run on every instance of whatever the blueprint is

[vast yarrow]

I think I understood, I'm going to try

YES! It seems to work, thank you very much!

[vast yarrow]

is the "getactorlocation" necessary? I didn't put it on and it sounds the same

[elder sage]

that's because it's playing globally, maybe?

I don't know a lot about how sounds work, but you probably want it in world space so it is relatively realistic

have I made some logical error here? I assume that I can just compare the player's team to each player's from an array, but that is not working practically for clients, as the colors are switched

only the highlighted section should be relevant

this is what it branches into

actually, does replicating a character also replicate things like its dynamic material instance?

[elder sage]

It actually only seems to work for players on the first team. I may have set something up incorrectly when assigning the material

I can even see the client's actors swap colors almost immediately after spawning

[sinful tree]

You shouldn't be looping through anything.

[elder sage]

I've removed the loops recently and it's still doing the thing

so the players have their team number in the top right, only the client on the top left is seeing things how I intend

[sinful tree]

I take it your goal here is so that no matter what, your team mates always appear blue and enemies always appear red, right?

[elder sage]

yeah

[sinful tree]

So on the OnRep and on the Begin Play of a character on the client only, you should check the playerstate of that character and get their team value.
The team value the decides whether or not that player should appear blue or red.

You compare it to the local player's player state and if they are == then the character you're checking should be blue.

[elder sage]

I already have this one

[sinful tree]

What is that in? Your character?

[elder sage]

yeah it's in the character

[sinful tree]

Then you have a problem already - you're checking only if it's locally controlled, which other characters will not be.

[elder sage]

so what should I do instead?

[sinful tree]

IsServer == False

or HasAuthority == Remote

[elder sage]

So I also need to check that when the team variable reps?

[sinful tree]

What you should do is make a function on the character called SetTeamColor or something to that effect. You can put the HasAuthority check directly in it. The OnRep can try calling that function if the pawn is valid.

[elder sage]

I've been putting the function in the player state. Should I not do that, then?

[sinful tree]

The character is the one with the color. The playerstate should just hold data about the player.

The OnRep on playerstate is a necesscity since that's where the variable lies, but that can be used to call the color change on the character.

[elder sage]

that's how it looks currently

I guess I don't get the point of the authority checks

[sinful tree]

The authority check is to see whether you're running something on server or on client.

Begin play fires on both Server and Client

[elder sage]

yeah, but this is a listen server

so the player with authority is being ignored in this case

the colors are still not switching based on the team

this is how I'm checking, same as when the game mode assigns them teams

[sinful tree]

Sorry, I was working under the idea of dedicated server. I do believe for listen server you shouldn't use the authority checks.

[elder sage]

so the green one is correct and the pink ones are not

it seems like the local players all know what team they're on, but just aren't applying their colors or collision channels correctly

is there some way to get the locally controlled player? or to check each to see if it's locally controlled? The issue must be that it's comparing the character's teams objectively (modulo 2), not subjectively (equal local team)

[sinful tree]

It's hard to do in a listen server... Normally on the client side you could potentially do "Get Player Controller 0" which would return your player controller, but with listen servers it doesn't always work that way.

[elder sage]

I'd prefer dedicated but I think I heard you can't package for dedicated and just run it for whatever reason

despite the fact that Ark servers exist and the process is literally called "ShooterGame"

so why doesn't the player controller 0 work for listen servers? I assumed that the local player would always connect first

[sinful tree]

Because sometimes the listen server itself becomes player 1 rather than 0.

or something to that effect.

[elder sage]

could I use the array of player states somehow?

like, run a for loop after a local control branch to see which one matches the local player's playerstate?

?

[sinful tree]

You know what - you are going to have to loop through each player anyway.... Lets say fringe case here... A player changes their team mid-game. You need to update the colors for all players for that client.

[elder sage]

I mean if it's not that intensive to run I might just run this entire thing again lol

[elder sage]

oh, that one just works

[sinful tree]

I used get player character here but I dunno if it's ok...

[elder sage]

let me try my idea just in case

I accidentally created the blue man group, so I'll give yours a shot

[sinful tree]

XD

All same team

Only bottom right team different

[elder sage]

yeah I did that by adding the thing I showed, minus the local check at the beginning

you may want to go to the hud and print your team variable so you can reference that

just because I couldn't figure out which one was which initially

so client 1 is the only one who has it right, in this case

[elder sage]

what's your team picker look like?

[sinful tree]

I just did a page up and page down to set the team

[elder sage]

mine's based on join order but is consistent so that's not the issue

[elder sage]

then your notify runs the function, probably

[elder sage]

I only get the player character then cast, could that be it?

each player has their own team variable, so why would you need to get each player each time those variables update?

[sinful tree]

Because if your team changes, you need to refresh all the character's colors.

[elder sage]

true

[sinful tree]

SO you may as well do it all at the same time regardless.

[elder sage]

I get these errors and they take me to some random branch in the for each loop macro

[sinful tree]

do an isvalid on the gamestate reference

[elder sage]

yeah that fixed the error

so I've copied your setup up to the function call

[sand iris]

In the description of AGameStateBase::PlayerArray it says:
"Array of all PlayerStates, maintained on both server and clients (PlayerStates are always relevant)'

What does it mean for these player states to be "relevant"?
Is that a network term like "reliable" ?

[sinful tree]

Always Relevant means they will always exist on all clients. An example of something that may not necessarily be relevant is the character a player controls - if that character is very far away from your character, you probably don't need to receive updates for it, so it is no longer Relevant. The actor is then destroyed on the client, but still exists on the server. When you approach that actor again on the server, the server will see that you are close, and make that actor Relevant once again - the actor will spawn again automatically and it's begin play will fire again on the client.

UE4 primarily uses UDP communications which by nature are not reliable network packets as there is no confirmation sent back from the client to the server (or vice versa) when data is received. Using the reliable flag on an event I believe has something within the transmission that says something like "please confirm receipt" and if no receipt is received, it'll continue sending it periodically until a receipt is received.

You'd want to use the reliable flag for anything that is gameplay important.

If it's just a visual or sound effect that needs to play, it doesn't need to be reliable.

[elder sage]

:)

so it works

[sand iris]

Oh I see, thanks for explaining! So basically, even if an enemy player's character/pawn gets destroyed from a client when it's too far to be relevant, their PlayerState would still be in that client and it would be accessed through GameState's PlayerArray on the client?

[sinful tree]

Correct

So you can still reference data about that player, just not necessarily the character they're controlling.

[sand iris]

One thing that I dont understand though, how is it that the PlayerArray is replicated even though it doesn't have the Replicated or ReplicatedUsing UPROPERTY specifier?

It just has:

UPROPERTY(Transient, BlueprintReadOnly, Category=GameState)
TArray<APlayerState*> PlayerArray;

according to the comment description it's "maintained on both server and clients"

[quasi tide]

PlayerArray isn't replicated. The contents are.

[elder sage]

so I want to make my line traces pass through teammates, any ideas for how to set the collision channels on those?

[sand iris]

So you're saying that what gets replicated are the APlayerStates it points to but not the array itself?

So what if a PlayerState gets removed or added to the PlayerArray? Doesnt't it need to replicated that addition/removal?

[quasi tide]

From exi's network compendium

[sand iris]

Oh I see, that makes sense now, thanks!

[elder sage]

say I want to package my game and play with a friend, I'd obviously need to set up the ui to connect to the nodes, but do I use these "create session," "find sessions," and "join session," nodes, or do I need to do something different?

I have a handle on UI stuff and loading maps, but have no idea what goes into online play

[thin stratus]

Session stuff would be #online-subsystems .

Generally speaking if you don't have a subsystem like steam to allow for sessions to be registered online then you can only connect directly via IP anyway

@elder sage

[elder sage]

that would probably be what I'd go with then, thanks

[thin stratus]

You will have to open ports on the host though

7777 should be the default one

[elder sage]

this actor is set to be invisible to the owner, but the owner still sees it. any idea what's up with that?

I've even tried setting the owner or setting the actor invisible manually and nothing happens

[gusty slate]

Hello everyone,
any advice on making the smoothest "elevator" platform in MP?

just some pointers if possible please so that I try and avoid physics issues and sync issues

[elder sage]

I can't seem to make a floating health bar be hidden for the owner of it, and it's likely because I'm not sure how to set its ownership

what I've tried so far

please ping me if you have an answer

[thin stratus]

@elder sage No 100% answer, but Replicated Actors should only be spawned on the Server.

And the Owner should only be set on the Server too

And usually it must be a ClientOwned Actor, preferrably the PlayerController.

[rose egret]

anyone knows how old value is saved for OnRep_(pre) ?
does it use copy constructor or serialize/deserialize ?

[chrome bay]

It's just a copy

[severe axle]

Guys, quick question. I have an actor component which is attached to my Character. If my actor attempts to call a function, which is supposed to be executed on a server, it'll fail, because only Actor the-owner can call RPCs, right?

[chrome bay]

Correct

In that instance only the player controlling/owning the character could call that RPC

[rose egret]

is there any virtual function in AActor to serialize some custom network data ?
I don't want to use UPROPERTY for my always changing properties.

[chrome bay]

No, but you could wrap it in USTRUCT, then define a custom NetSerialize() function for that struct

But you lose per-property serialization, it sends whatever you write which usually means all of it

(the properties that is not the actor)

[winged badger]

@severe axle no, anything ultimately owned by the PlayerController on client can RPC

that includes PC, Pawn, PlayerState, any Actors that have had SetOwner called with any of them as a parameter, and any components on any of those Actors

if the RPC fails due to ownership, you'll have "No owning connection for..." warning in your Output Log

Actor also needs to be replicated to send a RPC - you can't RPC from something you spawned client side, or something that is not replicated

[gusty slate]

Pardon me asking again :p
any advice on making the smoothest "elevator" platform in MP?
just some pointers if possible please so that I try and avoid physics issues and sync issues

[lament minnow]

What exactly does join session do? As far as i can tell its basically only useful for getting the travelurl, and doesnt notify the host that it wants to join(i'm only looking at the null implementation though).

[chrome bay]

Join session actually puts you into the online session, i.e. so the online backend your using knows what session you are in

once joined successfully, you can travel. the null implementation doesn't have any online backend service

[lament minnow]

ok, so that's why i'm confused about it's implementation.

[sand iris]

how do you normally get a reference to the GameState from a server? Through GetWorld() ?

[vivid seal]

so i think i finally got custom movement stuff working with the 4.26 changes to CMC. When i do p.netshowcorrections 1 I am seeing some capsules appear, but they're pretty sporadic, most of them are green or yellow with the occasional red. I have 200ms, 5% packet drop, and a couple other stats bumped up to simulate bad lag conditions. With these settings is it normal to see net corrections, or should I still be aiming for never seeing those?

[vast yarrow]

Hello, I have a question, how can it be done so that a player who is in an area does not die and if he is outside, yes? I tried an triggerbox, but when one player was inside, the others didn't die either. Sorry for my English

I don't know what is the correct way to do it, what I do is that when it is in that triggerbox the character variable is false (so it doesn't die) but it seems to change them all.

Yes

I have an event that turns the player into a ragdoll and "dead" appears on the screen.

yes

It is a race that from time to time if you do not meet certain conditions (such as staying still) you die, when you reach the end I want it to not matter that you do not meet the conditions, that you move freely without anything happening to you

When I don't have to move and I move, the event fires correctly

I just need to deactivate it for the player who reached the end

I was able to get the triggerbox to detect me, but I don't know how to disable the event for that player only.

[vast yarrow]

yes

[elder sage]

That's probably my issue, then. If I want this to fire when my character spawns, should I just put an rpc in my begin play?

It seems like the issues I keep finding myself with is one where I accidentally spawn too many UI elements or actors that overlap, and I assume that I'm unable to affect them, while in reality I've just stacked multiple and only changed one

I spawned a health bar from my "draw Hud" event a while back and assumed that I wasn't able to reference the actor properly

[twin juniper]

hello guys, i have an rpg like project with many features already built without multiplayer in mind

it mostly uses multicast delegates for funcionalities, not much function calling outside of the events, from you experience, is it tough to convert an already big project to multi?

🥲

do you think its smarter to start from scratch?

even if its already a big project

for sure

i guess i will have to go through the code and see how much it can actually be reused

thanks

[elder sage]

I'm having trouble getting a reference from clients to a health bar actor I've made. I'm not sure how to set a reference to it so that each client will be able to access it when they take damage. I previously had this working but had to change the actor spawning to be on the server

this reference is no longer valid because the clients can't access it when it's set

it's a separate actor though, just attached to the player

I actually resolved the first issue by replicating the actor

Do I need to call "destroy actor" on the server too? When the player respawns the health bar is not removed and another one is created and attached

[warm sequoia]

hey guys, I am doing replication so when my character picks up an item it disappears for everyone, but when he drops it, only the character that dropped it can see it, no one else can... any ideas how to fix that?

[elder sage]

is the item an actor? If yes, does the actor get created when it's dropped? If yes, is the actor created by a server rpc?

this is the issue

Is the issue with ownership, maybe?

[elder sage]

I'm still having the issue with the health bars not disappearing

I'm making progress, but it seems like ownership isn't being set correctly. The local player can still see their own health bar

[sinful tree]

Is there a particular reason you're using actors attached to your characters rather than using a widget component?

[elder sage]

yeah it's so that I can set their visibility when they're obstructed

and other minor issues caused by that not working basically

my end goal is to make it so that these health bars aren't visible behind walls, but I'm apparently running into issues with ownership, so owner no see also doesn't work

[elder sage]

I'm just gonna go back to the health bar component and figure out a different way of doing this

Okay, so what I'm trying to get working currently is I want the component to get hidden whenever its line of sight is blocked, like by a wall or object. I had it partially working, where when any player was obstructed, it would set itself to invisible for all players, but then it would start to flicker rapidly, and I do not know why

what if I perform a line trace from each health bar to the local player, and if it's obstructed, I set the property on either a custom material or the opacity of the widget itself?

I just did it

how do I create a lazy tick so I don't cast multiple times per frame?

[spring vortex]

Does anyone know if you still need advanced sessions to host a game as listen serv on steam?

[lost inlet]

if you mean without C++ then that's probably likely unless there are comparable plugins that can register/join the session for you

[spring vortex]

Thanks, man. Appreciate it

[fossil spoke]

GameSessionClass = APGGameSession::StaticClass();

The GameMode defines the GameSessionClass to be used.

[vast yarrow]

That's what I try to do, but when I change the variable to true, it changes it on all players.

Does anyone know how to change the value of a variable in one player and not all?

[peak sentinel]

Anyone remember on top of their head if PushModel system was able to differ changed and unchanged data when sending replication?

[sinful tree]

Change the variable on the specific character / playerstate of the player you're wanting to change it on.

[vast yarrow]

I am new to unreal engine, I am going to investigate about the player state, thanks

[silent valley]

You can run the server configuration directly from Visual Studio. Set your breakpoints and launch it.

I would think so, but I've never used Rider.

Development Server configuration is what it's called, the default editor is called Development Editor I think.

How are you launching the Dedicated Server then?

If you're running it via cmdline to ue4editor.exe then you can add those same commands to the debug launch parameters in Vs/rider.

To build Dedicated server you need to build engine from source.

[rough jolt]

So question here
after I made sure my game works in multiplayer in the editor by testing with a fake server in standalone mode
and i package my game out
how do I host an actual server so my friends can connect to it and we can test it together?

[silent valley]

Yeah, so the PIE workflow is not the same as building Server configuration, or making a Server package I'm afraid. For instance I don't think RegisterServer is called.
FWIW it's not a requirement to call CreateSession() from RegisterServer either - for example at the moment we use GameMode::Tick() to register it after certain criteria are valid.

But if you want to run Dedicated server on another machine at any point you're going to have to figure out how to build Server config.

[silent valley]

You'll need someone who knows about Rider to answer that for you.

oh... that's odd.

did you build a Server package from the Editor?

do that then 🙂 that cooks the data that the Server exe needs to run (and also builds the latest server exe)

no need

[chrome bay]

Yeah it will the first time. Engine has to be recompiled to exclude non-server data.

[silent valley]

nothing 😄

lots of RAM and lots of Cores is the best you can do

Threadripper + 128GB ram would help no doubt

[meager spade]

Mine is only a 3950x with 64gb ram works fine.

[thin stratus]

Building the Engine is never fun. For a single dev it's probably pain, unless you have enough money to spend. We opted into using more reasonable CPUs for the dev machines and just beefing up a build machine that does the work for us.

But yeah, only an option if you work with multiple people, otherwise it makes little sense to buy a second pc for building :D

[meager spade]

Yeah we have a threadripper build machine

[silent valley]

yes

[thin stratus]

I would recommend learning about the Project Launcher a bit, as it allows for having more control over how the games are build, cooked and packaged.

Can reduce iteration time by a lot

[silent valley]

My build machine is a fanless i7 under my stairs. Seriously underpowered for building engine, but as we use Install build workflow it only has to happen every time we upgrade the engine. Takes about 12 hours to build the installed engine with everything we need.

You don't - you forget and relearn when you need to 😂

[thin stratus]

We don't. We google and find our own answers on AnswerHUB every 2 Months.

[peak sentinel]

😦

[bronze torrent]

Hi, I have created a wall run for my game. This works fine when solo. In multiplayer I cannot figure out how to replicate the wall run correctly. There is a jitter when wall running on the client side and I'm not sure how to sort this.

[peak sentinel]

Anyone knows what is WithNetSharedSerialization? Why it is useful?

[bronze torrent]

its created with blueprints @twin juniper

[elfin sail]

can we sync data of two dedicate servers ?

or any related info link will be appreciated

[chrome bay]

It means that the type only has to be serialized once for each connection, i.e. it doesn't contain any connection-specific data such as FName's or UObject references.

[empty axle]

never heard of something like that. What would be the use case for that?

[elfin sail]

https://forums.unrealengine.com/t/how-to-communicate-between-dedicated-servers/150613

something like this @empty axle

its use case in MMO

if i need 300 or more players info

[empty axle]

UE is not designed for MMO. You need to carve your own tools for that.

[elfin sail]

for now have to go with this

may in next phase

but now need find some solution in UE

already write down most of the things

[empty axle]

what exactly you want to send to the other server? Data about your players should be already in the database so the second server could just query it for it

then you don't need that server to server communication

[elfin sail]

one client can connect to two servers of UE of same level ?

i don't think

need send all servers info to master and the get from there

[empty axle]

I didn't said that you have to connect to two servers at once
Every server in your case is a separate level ?

and you want to sync the data when travelling from one to other?

[elfin sail]

level is same and they should be able to spectate all players in between two or three servers

@empty axle

[empty axle]

ohh, so there is definitely nothing built-in

[chrome bay]

MMO's pretty much always need their own bespoke architecture

Not something you can realistically build without a lot of expertise

Not to discourage, but best to set a realistic expectation

[bitter oriole]

Not something you can realistically build without a lot of ~expertise~ millions of dollars in marketing

[elfin sail]

i tested POC with 150 players

its working with UE4 solution with out doing any thing extra

but out requirements is about 600 players in single event

but for now in first phase 200

[chrome bay]

The only thing I know of that even comes close to what you want is SpatialOS - and it's taken them many years and many millions to get where they are. Not sure any game has shipped with it yet either.

[twilit radish]

Didn't Epic already had 'trouble' running 100 players for Fortnite? Also why not just use multiple servers, it can definitely be done though.. I know The Division 2 runs or ran 1000 players on 1 server but those are companies with a big budget and loads of people who know what they are doing with according to them people dedicated to optimising their servers 😛

They aren't running UE4, but that aside.

[chrome bay]

The answer is as always "it depends" - 100 players is a huge challenge for an FPS/TPS that has to remain responsive. Much less of a problem if it's a 100 player turn-based card game.

I suspect Division 2 has it's own funky architecture, but IIRC it also famously launched with a lot of client-side code that made it very easy to hack and cheat in. Not sure if offloading responsibility to clients instead of server to support player numbers was the motivation for that.

Or was that Div 1.. can't remember now

It doesn't scale linearly with number of players either usually.

But yeah.. Epic did a lot of groundwork to get the engine up to/beyond 100 players more easily.

[twilit radish]

https://youtu.be/bcXxyKqgV0c

It's an extremely boring talk if you're not interested in programming, but they explain a lot of problems they encountered and also go really deep into it. They also explain their architecture while doing so, they used a ton of parallel threading / multithreading to get it to run along with a ton of other stuff. They have if I remember correctly worlds for every player and run those all in parallel next to each other to tick them.

[bitter oriole]

Though again, 1000 players on the same server is a matter for about 100 games on PC

[sacred spire]

Division 2 has 1000 players? I don't play it, but aren't most videos show only one or few players max? How 1000 players?

[twilit radish]

I believe they have a lot of worlds per server, not necessarily all players together in one world. But don’t quote me on that 😅

[sacred spire]

Uh basically like Destiny 2? Only few players max. That's no longer considered as 1000 players.

Only BR games usually has 100 players

[twilit radish]

I have not played Destiny, sorry.

[sacred spire]

Same

[bitter oriole]

Destiny has a hard limit of 16 IIRC

[sacred spire]

I only saw Destiny in youtube video

[bitter oriole]

D2 has 3, 6 or 12 players in activities

Nothing would prevent you from doing Destiny with Unreal Engine, other than their ability to have 60fps menus while loading levels

[sacred spire]

As long as it is not some 100 players BR or 1000 players, i think it should be fine.

[violet sentinel]

How to properly rotate AI controlled characters in mp?

1. Shooter game has bUseControllerRotationYaw on characters and custom FaceRotation. CMC options are off but leading to moonwalk
2. Guides suggest turning off bUseControllerRotationYaw and use CMC options "face movement direction" walking is fine but targeting is broken

[thin stratus]

Guess via the control rotation?

[violet sentinel]

so 1?

[thin stratus]

Oh yeah

Didn't release that was options

[violet sentinel]

😄

so far i did made it like shooter game, the only problem is that they moonwalk (always face focus direction)

during AIMoveTo orders

it works perfectly on clients

except that one thing

[chrome bay]

Should use properties not RPC's to move pieces

Location of a piece is a property not an event

[nocturne iron]

I don't agree, events are way better in my case due to some future features.

Do you know why this might not work tho?

[vague spruce]

How do i change the ip of a dedicated server?

[lost inlet]

0.0.0.0 is just the broadcast IP, are you only wanting it accessible over a specific network interface?

[dark edge]

You're making chess, you don't need local and server versions of moves. Just do it like this.

RPC move to server
Server does move
State replicates back

If by future features you mean replays, the server still has a list of all moves in order

[vague spruce]

@lost inlet Well yes i think basically i have the server runing on a different machine and de client in an other, wen i try to connect to the server nothing happens aka the clinet cant conect to the server. So i was told to change the ip address of the server

[lost inlet]

well if it's broadcasting over every network interface, I'm not sure how you think changing that will change your fortune

[vague spruce]

So any idea why i cant connect to the server?

[chrome bay]

Before I go into testing this - does anybody know if PostReplicateChange is called on an FFastArraySerializer, if an unmapped UObject within it is mapped?

RepNotifies are called when objects are mapped, but I'm unsure if that internal function is called.

Massive pain to setup a test for it so wondering if anybody knows definitively

[lost inlet]

Well I have no idea about your setup, is it behind a NAT?

[chrome bay]

Ok according to UDN PostReplicateChange is called when an object is mapped. Good stuff

[vague spruce]

Yes and the ports are open

[copper grove]

is there some sort of known engine bug for rep notify and the float value 0.0f

it seems like only sometimes the rep notify will fire when the rep notify float is set to 0, but it will always fire if set to anything above 0.0

[sinful tree]

Seems to be working just fine on my end.

[copper grove]

in c++?

[fading birch]

you specify the server target when packaging your game. That's how you package the server in the first place.

[chrome bay]

Um... anybody ever experienced UWorld::NetMode returning 'Dedicated Server', but IsRunningDedicatedServer() returning false? Even weirder, anybody experienced the GameMode being present on a network client :/?

Oh ffs. They're static events. Of course.

Yet another stupid pull request merge

Static gameplay events in editor environments.. my fave

[fading birch]

I've not packaged a server directly into debug mode but I don't understand why you wouldn't be able to. Maybe ask in #packaging

It's not.

[chrome bay]

Even COOLER. World subsystems are initialized before the worlds netmode is properly set.

[fading birch]

Well what are you trying to do exactly?

[fading birch]

You can do that. Just launch the dedicated server from VS directly. You can just pass in a custom configuration option and use development and it'll work like a charm.

[ebon plume]

Anyone know why my projectile collision (hit events) are inconsistent ?

I'm using the default settings (other than adjusted collision settings)

Is there a known issue with this ?

It's only when I shoot on full auto. It's about 0.05-0.08 seconds on a timer

[thorn zinc]

Can anyone tell me why this isn't destroying the actor on the other clients? :S

[distant talon]

if you are calling that from a client, then the caller might not be the owner of that actor, in which case it'd never reach the server

note the "(if owning client)" in the server rpc

you might need to route your rpc calls through the player controller or pawn or something the player owns

[thorn zinc]

Alright thank you!

[elder sage]

So as I go to override my Choose Player Start function in Game Mode, is there any easier way to check line of sight than doing a bunch of line traces?

I'd rather not spend time building something that already exists, basically, and I know nothing about player starts

[spark owl]

i'm having issues with begin overlap events triggering when they shouldn't be. To explain exactly what's happening, I'm making a high paced soccer game, and sometimes the overlap events for the goals trigger when they shouldn't. Basically the ball gets kicked at the goal at high speed, and either the gk saves it and it flies another direction or it hits the posts/crossbar and bounces away, but it still triggers the overlap event

this is an example of it happening

i've nick named these ghost goals

[harsh lintel]

when a client disconnects from the server, is there a function that is called? I see AGameStateBase::Logout but I don't know if that's the correct one

[elder sage]

Is it a desync issue?

[spark owl]

i don't think so. I did a switch has authority node on the custom events that fire from the overlap, so it should be only firing on the server

[elder sage]

So if you record multiple perspectives, does it go into the goal on any of them?

[spark owl]

no, from what i remember when it happens, people generally agree it shouldn't have been a goall

idk for sure tbh tho

[spark owl]

in game mode base blueprint there is event on logout

[spark owl]

i don't think it's an issue of the client firing it as far as i can tell. I have the actor blueprint class that has the overlap collisions not load on client and as i said, on overlap events I do switch has authority to make sure only the server fires it

[elder sage]

So is the issue that the client is desynced, meaning that the ball actually does overlap the goal on the server's end?

You could also try putting your collision further back into the goal and see if that improves consistency

[spark owl]

i don't know really i've been trying to figure it out for a while. The ball doesn't seem to be desynced for clients.

[spark owl]

this is a workaround I might end up going with, but what I think might happen with this, is some goals won't count when they should. might be a better alternative than the problem i'm having now. would probably be less common

[winged badger]

@spark owl you can ditch the overlap event completely

its easy enough to do the math if a point is inside a box by hand

and in this case, running that on Tick wouldn't really hurt

[devout plaza]

If I spawn an actor and replicate a variable that reference this actor, the variable might be null on the client because the variable was replicated, but not the actor it's pointing to.

Does the variable magically update its pointer when the actor is replicated?

[empty axle]

Yes

[devout plaza]

OK great, is there a good strategy for catching this issue? Does a second OnRep_MyVariable() call happen so I can use that or do I need to create some kind of wait tick for both to be in sync?

I have a weapon that's both spawned and set as the current weapon at the same time, and the "current weapon" is set to null on the client because the weapon isn't synced yet.

I'm hoping a second OnRep_CurrentWeapon() call happens when the actor replicates as well, but I assume that doesn't happen. In which case I have to do a "bWaitForSync = true" or something...

[empty axle]

it should execute OnRep once again if the actor is already there

[devout plaza]

Oh you're right, I just saw this happening, yay!

I'll just ignore a nullptr current weapon on clients then 👌

[chrome bay]

Yeah when UObjects are "mapped", any properties referencing them will trigger their rep notifies again

Same is true for objects in structs/arrays etc.

The idea being that you can workaround race conditions

[rose egret]

anyone knows how and when Unrelaible Server RPC are sent as UDP packet ?
I'm making my own fast pace movement component and want the input to be send as soon as possible 🤔
should I call unrelaible-server rpc every Tick and and let the engine decide ? I guess engine merge them and send them when needed, this way I may full the buffer if my input data are not little

or is there any Event to tell us hey we are going to send a packet to server

🤔

[twin juniper]

hello guys did anyone worked with AWS GameLift in ue_4.27 with a team of 10 people?

with any version control like git

if anyone did then please help me how to setup

like that

[chrome bay]

@rose egret All packets are sent via UDP. There's no callback for when they're sent.

They're just appended to the outgoing buffer for that frame, providing they fit in the remaining space

[twin juniper]

Guys does anyone know how to use Google cloud for ue4 multiplayer

[chrome bay]

Character Movement does exactly what you're describing, but sending every frame is a bad idea - so instead it tries to pack up subsequent moves, up to a maximum delta

[twilit radish]

Speaking of, does Unreal make sure packets don't get duplicated?

[twin juniper]

guys any one?

[twilit radish]

There's a channel specifically for this, #source-control

[chrome bay]

@twilit radish yep - or rather, it doesn't process duplicates

[twin juniper]

how to make multiplayer in ue a part from aws

is there any thing else?

[thin stratus]

Sooooooo, I have a fun little thing to just casually discuss. Might be interesting for more people:

Movement Corrections for Clients that collide with AIs and maybe even other Clients.

That's an issue that we are currently facing in one of our projects and just from the knowledge I have about the CMC I don't quite know a solution.
What I think happens is that the Client collides with the AI either on Server or Client first, because the Location of the AI is not 100% in sync.
AI for a Client is a simulated proxy, so they only get some location smoothing and that's it.
The Client's Character has a dash that, when hitting an enemy, bounces the AI backwards and stops the Client more or less in place.
Now while this works, it causes tons of corrections for the client and the AI.

I think we are doing the launching of the target Client-side too, as theoretically Client and Server are 100% in sync due to the timestamp stuff.
But their target is not, because of the simulation. Is there something build into the engine for this already?
Anyone having dealt with this before?

[twilit radish]

The engine features it's own ways for multiplayer, Amazon simply offers for example matchmaking and a place to host dedicated servers. There are plenty of others options to do things. I would recommend reading through this: https://docs.unrealengine.com/4.27/en-US/InteractiveExperiences/Networking/ along with this: https://cedric-neukirchen.net/Downloads/Compendium/UE4_Network_Compendium_by_Cedric_eXi_Neukirchen.pdf

[twilit radish]

Does it have to be cheat proof?

[twin juniper]

guys is there any proper tutorial like how to start multiplayer, matchmaking, room creating, spawning into game and start playing,

like all tutorials even payed also its ok i didnt find any one like this

[thin stratus]

Probably on GameLift end. I don't think there is anything about this in regards to UE4

But the question also lists multiple things that are partially UE4 and partially whatever backend you use

There is enough tutorials about just UE4 multiplayer that you can find

[twin juniper]

if there is nothing how a beginner will start?

[thin stratus]

Usually beginners don't make projects that require AWS etc

You should learn about UE4 multiplayer in itself first

[twin juniper]

even after multiplayer aws is new right?

[thin stratus]

Yeah

AWS is it's own thing

[twin juniper]

ok any links or tutorials

[thin stratus]

Thom listed stuff already

[twin juniper]

ok

[thin stratus]

My Compendium is probably a good start

It's information rather than a strict tutorial though

[twin juniper]

what?

[thin stratus]

The second link Thom posted

[twin juniper]

its a information right

i need like a proper start

[thin stratus]

Probably not, it's listen server based anyway. I thought about just accepting client side location on server...

[thin stratus]

Yeah then start reading the pdf

[twilit radish]

Is the dash instant or does it like build up?

[thin stratus]

It's instant. But it's build into the CMC in C++

[thin stratus]

https://www.youtube.com/watch?v=JOJP0CvpB8w

You can also try this

There are lots of different things you can watch, probably good to get info from multiple places anyway

[twilit radish]

+1 for that video, it's well explained.

The problem I see with accepting the client location is that it will cause a 'correction' for other clients, which could very well also be acceptable but I guess that will also correct the AI right? Because if the client says "I hit them at this location" I assume the knockback will be applied from that location, causing a 'correction' because the AI may have been in a different place on the server at that point.

[twin juniper]

thx @thin stratus

[thin stratus]

Yeah they both get corrected

No matter if I predict the hit or not

If I predict the hit, it will 100% be corrected, cause there is no such thing as prediction on moving simulated actors.

And if I don't predict the hit, then there is a delay before the AI actually gets kicked backwards

The player gets corrected cause they just don't do the hit in the same timestamp

Either the client hit the AI in timestamp X and the Server didn't, so you will be corrected into the AI.
Or other way round, you will be corrected backwards to a stop

Shitty situation :D

[twilit radish]

Yes xD

[thin stratus]

If I accept client side, it will not correct the autonomous proxy, but the AI will still look shite

[rose egret]

@chrome bay I know CMC do that but I did not see how .
I was thinking of packing subsequent moves based on time. but it add a little delay and not a good idea for fast paced when I want the input to be send asap
🤔

[chrome bay]

It's quite simple. It saves the moves into a buffer before sending them. If a move is deemed "important" or the total delta time reaches the limit, it's sent

[rose egret]

if CMC packs the moves when/how it decide to call a server RPC for sending them ?

[chrome bay]

It checks at the end of each tick

You'll have to look through the code to figure it out

But ultimately you don't want your bandwidth usage to be tied to how fast a client machine can run the game

[rose egret]

so it packs movements of a single frame ? that doesn't make sense 🤔

[chrome bay]

If a client runs the game at 200 FPS, it'll be hammering the server with packets and also limiting the outgoing bandwidth for all other systems

All the movement data is processed, then that data and the input is sent together at the end of the frame

But the point is you don't send every frame

You combine the movements together and send it in batches

Think about it, when a player is pressing "W" and moving forward more often than not, they're doing it for many frames in a row

[thin stratus]

I think the CMC by default only ever combines 2 moves into one, or?

[chrome bay]

It can combine as many as it likes up to the max delta time

[thin stratus]

Right, okay, which is 2 at a time though, based on the functions

[chrome bay]

But if you're lagging it might resend old moves

FSavedMove_Character::CanCombineWith is what determines whether a move should be combined or not

But you have to limit that maximum delta between combined moves, otherwise the server would snap even more severely

Characters don't move on the server until they get packets from the client, they're stationary

Unlike physics objects.. which is what makes physics prediction nigh-on impossible

[rose egret]

🤔

hope someday I write my own movement component successfully😁

[chrome bay]

tbh there's little point doing it the same way as CMC once Epic finishes the network prediction plugin

You won't have to really care about any of the netcode behind it anymore, it'll be a single solution for all

If you're making a movement component today, best to start integrating with that plugin IMO

Not yet finished, but certainly getting there.

[rose egret]

the last time I checked that plugin was a year ago or even more,
I want to learn it cause im making some test with yojimbo as well , so that in far future I may try some king of custom replication for MMO game
spent several month to write replication system over yojimbo and failed

😁

[twilit radish]

I'm afraid I also don't really know a good solution Cedric, ideally I think the client that attacks should have the best experience because it feels extremely lame if you knockback an AI and it doesn't do it instantly. Maybe accept the player location and 'correct' the AI on the server to that position while predicting the AI knockback on the client? Should make it feel instantly for the client that hits but will obviously look a little weird for other clients.

If that's even possible, if so you could also try to see if you can smooth it out a bit with lerping or whatever instead of directly snapping it?

[thin stratus]

Yeah we might not get around accepting client location hmpf

At least when talking about simple solutions

The AI correction is pretty impossible in my eyes

The server doesn't know about the client hit, unless I pass that info to the server via the CMC

But the worst situation is actually still to solve

Player vs Player :D

[twilit radish]

Players can dash into other players?

[thin stratus]

Lovely, isn't it

[twilit radish]

I thought you meant they could only walk into each other xD

Yeah that's.. Rough.

[thin stratus]

Na, they movement can connect between AIs and Players

They are the same sort of character

[golden nest]

Hi, can someone give me an advice of how to solve a login problem?

[bitter oriole]

Explain your problem first

[golden nest]

What i'm trying to achieve is logout a client of an account whenever another client log in the same account

So, i don't know what is the best approach to this

i'm currently using graphql to request data from my server

I thought to send a request after a defined time like 5 minutes and check if there wasn't any other client waiting to log in, but is this the best way?

I know games like Metin2 that logs out the current logged client whenever another client tries to join, but i don't know how

Any ideas?

[bitter oriole]

Sounds like any request sent by the previously connected client should check for concurrent connections and drop the client

[golden nest]

I'm currently sending request only on log in and logout, so it's difficult that way

Cause i need the first client to logout in the middle of login - logout when another client joins

I know about subscriptions in graphql, that i can send a message to all subscripted clients whenever an event occurs, but it opens a new web socket from server to each client subscripted, and that's a bit inefficient, isn't it?

[twin juniper]

Hello guys.Plz can anyone point a documentation on deploying ue4 server on digitalocean

[dark edge]

For single test server, just build the project for Linux and run it. For automated deployment, that's going to be well outside your wheelhouse if you're having to ask this question

[twin juniper]

I am pretty. Much new to deploying.Can I get any on automated documentation on that?

Can I get any documentation on automatic deployment?

[paper hinge]

Hello, I am having a issue with my Dedicated server on linux on FWebSocketsModule::Get().CreateWebSocket, do I need to install anything else on the linux machine?

FWebSocketsModule::Get() is returning null, Windows working fine

[spiral timber]

I have a NetMulticast RPC that is Reliable on my GameState class which I am calling on a dedicated server. The RPC is invoked on the server but doesn't get called on my client. I'm running PIE with Run Dedicated Server enabled, Run Under One Process disabled, 1 client, and Play as Client chosen.

Any clues? It definitely isn't being called on the clients as I have a log that would print if it were called.

[sinful tree]

Are you calling it on Begin Play?

[chrome bay]

Might be calling it too early, i.e. before clients have received it

[vague fractal]

Could someone explain this warning to me 😅

Warning      LogActor             SetReplicates called on non-initialized actor BP_Pickup_Generic10. Directly setting bReplicates is the correct procedure for pre-init actors.

I'm really not sure how to fix this, i just know it's about the Pickup's i'm having placed in my level

[spiral timber]

Nope, it's called when something is damaged.

Does it matter if I call the RPC from within the class or outside of it?

[sinful tree]

It shouldn't

[chrome bay]

@vague fractal Don't call SetReplicates in the constructor

Set bReplicates = true/false directly

(until the actor is initialized i.e. fully spawned)

[vague fractal]

So replacing SetReplicates(true); with bReplicates = true; is really all i need to do ?
Like this will not break anything on dynamically spawned pickups at runtime ?

[chrome bay]

Only where you call it somewhere before the actor is initialized

I.e, constructor

From the message: Directly setting bReplicates is the correct procedure for pre-init actors

[vague fractal]

Alright, i'll just go with it then, thanks ^^

[quasi tide]

Can't wait for all the bugs that'll come from that 🤣

[dark edge]

Do you know is the network prediction plug-in specifically just for movement or is it more general? Because if you think about it, Position = HP, collision = MaxHP, move = damage. It's all just numbers, constraints, and operations on the numbers.

[chrome bay]

AFAIK it's just generalised prediction

but tbh, IMO it's better to predict as little as you can get away with. The added complexity from predicting everything rarely helps

Supposedly it's going to interop with gameplay abilities a bit better, but it's more geared towards movement

GAs has it's own prediction and apparently Epic is doing everything with that nowadays

[rose egret]

I wonder why is my AVehiclePawn derived pawn so lagy even in PIE ?
does it support network by default ?

its my first time with replicated vehicle

[sterile plaza]

Is there an event on the server that marks the first time I can RPC/replicate data to clients? I have initial state that clients need to have before other data gets send down. We were doing this in AGameSession::RegisterPlayer() but it doesn't seem to work anymore as that seems to be too early for clients to receive RPCs. This used to work, but maybe something in UE5 changed it?

[rose egret]

@sterile plaza maybe AGameModeBase::PostLogin ? or maybe doing your main stuff after a warmup time ?

just send your initial data first, then after serval seconds start your game send other data etc ...

[sterile plaza]

    virtual void PostLogin(APlayerController* NewPlayer);```

does seem quite relevant, thank you

[paper hinge]

Is there anyway to use the WebSockets module on a Dedicated server? (FWebSocketsModule always nullptr)

[sinful tree]

<@&213101288538374145>

[minor anchor]

<@&213101288538374145> Manny missed one again

[final thicket]

Nah, they spammed every room

very many lame /10

[nimble cedar]

why are reliable multicasts not really all that reliable? is there anything one can do to make it better?

Im doing a drawing app and need the data to be sent reliably

right not im doing an rpc to server and a reliable multicast from there

but sometimes im not getting the data

even on lan with cables

[sinful tree]

What actor are you multicasting from?

[nimble cedar]

a tool owned by a pawn

the data gets through most of the time

but sometimes not

i see segments missing in the drawn line on the client machine

the line is perfect on the listen server

im drawing on the client

[sinful tree]

Are you RPC'ing on tick or something?

[nimble cedar]

im rpcing when i need to send the segment

this depends on the distance drawn and angle change

[sage isle]

I am messing around with a project where people can swap between different characters where the controls and stats are different for each, I think putting all the (possible) controls into one player controller might be the right way and then the actual character pawn would have all the stats for each of the different characters with the different meshes. Anyone got any better ideas?

[elder sage]

That's more or less what you should do

Like if it's an Overwatch clone, your player controller would capture your inputs, rpc the server, and then I'm pretty sure the server should be set up to run the actions on your player character, like if you use abilities or shoot

So if you press and hold "shoot," the player controller knows what hero you're playing because it references it for events, but it doesn't really care what type it is, because the inputs would all be the same

[sage isle]

Okay so I am more or less on the right track here then, I had been trying to figure out the best way to go about this and wasnt sure where the inputs would be best suited to go

[quasi tide]

PC - has character agnostic controls. Like pressing escape to open the menu
Pawn - has character specific controls. Like crouching

At least - that's how I do it.

[sinful tree]

The Player Controller as Duroxxigar has pointed out should be for controls that aren't specific to the player's character.

You can create a base character that contains all your stats and what have you that all your characters will have. You then create subclasses of that character for each of your characters you have in your game. Anything that is going to function the same for all characters (like receiving damage and subtracting from health) should be on the base character. Anything specific to the character should be done on the specific character.

When possessed, your characters are fed input from the player controller automagically. So if you have say a "Low Punch" and "High Punch" controls, you can place them within the base character if they all work the same for each character, otherwise, in the specific character.

[sage isle]

Makes sense, so like movement and things like that in the character pawn but then player menus and what not would be in the controller. And making the other characters children of the base character might do the trick as far as the stats, cause like I want them all to have a health component but the amount would be different for each, stuff like that

[sinful tree]

Correct.

If you define the stat in the base character, then you can always change what that value is in the child character.

[sage isle]

Awesome, thanks!
This has been a big help, gets me going in the right direction

[sick frigate]

Does anyone know what conditions cause a Pawn's EventPossessed to fire when you are a client connected to a server?

(sorry repost from blueprint - probably better suited to this channel)

[fair lantern]

Hey guys, im pretty new. Would anyone be willing to put me in the right direction for setting up an easy dedicated server for my project for testing?

what would the most noob friendly approach look like?

[sage isle]

So dedicated servers are not what I would call noob friendly but this guy has a tutorial that did help me get one going, if you follow it this will get you going in the right direction
https://www.youtube.com/watch?v=zNUxzl8Dcb4

@fair lantern

[rancid flame]

I need a unique ID for every player, but I need to get it from their possessed Pawn/Character, where should I be looking?

[elder sage]

Player index? Or maybe just the index number from the game state's player array?

[peak sentinel]

I dont think gamestate's array is a good way because afaik it is not replicated

Every connection determine it when a player joined or left the game

So indexes might not match

[fossil spoke]

Use the PlayerState??

It has a UniqueId property.

Which is the UniqueId of that Player within that Session.

(If that same player left and rejoined, the new UniqueId would be different).

[rancid flame]

Thanks, I'm still very new to anything outside of UMG/Slate

[lost inlet]

uh the UniqueId is the same

since it's their net ID

PlayerId will be the one to use for a single session

[fossil spoke]

Yeah this one, mixed them up 😦

[tropic snow]

Trying to make a spectator mode with set view target blend. Anyone know why its choppy when in spectate?

[elder sage]

it seems that by default player starts are random, in that a player will spawn at a random one initially and then at that same one each subsequent restart. Is there a simple way to make it always random, so I can test other stuff before making good spawning logic?

nvm I think I got it

[whole urchin]

in c++, can i OnRep 2 replicated variables with the same OnRep_Function ?

[bitter oriole]

Sure

[whole urchin]

how should i do it ?

[chrome bay]

Exactly how you'd imagine you'd do it

[whole urchin]

just putting:

[chrome bay]

yep

[whole urchin]

for both

thank you guys

[peak sentinel]

Is there any guide for network prediction plugin? Just took a look to source code, does not seem to be that much commented

[chrome bay]

There's not, outside of the readme

And the example part of the plugin

[clever plinth]

When a new actor is spawned server side, when do its replicated fields get set for the first time on the client? (Or if somebody could point me to the code where this happens that would be helpful).

[chrome bay]

As soon as it's spawned on the client

Any initial property states come down with the spawn packet

[clever plinth]

I should have been more specific: I'm trying to narrow it down further. Like before PostInitializeComponents for example?

[chrome bay]

It's not done in the actor itself

See UPackageMapClient::SerializeNewActor

[daring folio]

Hi everyone! just wondering if someone here had an issue similar to mine, I have an actor replicating, when i spawn it on the server the correct owner is set and i can see that, but the replicated version has a null owner when i try to access it on begin play

[blazing spruce]

Hi all, so there seems to be a bug with hosting sessions on 4.27 where it fails to create a session but works in 4.26, does anyone know of this bug and also if using the advanced sessions plugin will fix this problem?

[daring folio]

nvm debugging OnRep_Owner i found my mistake, i was not calling Super::GetLifetimeReplicatedProps so indeed the onwer was not being replicated

[clever plinth]

Is this with steam? I recall reading on here that steam integration may be broken in 4.27

[vague spruce]

how do i connect to a dedicated server, the connection is timing out already have the ports open on the machine with the server running?

[snow turret]

Hey guys, I'm needing some help with replicating animations for multiplayer. It's showing fine on the client, but not replicating to the server? So basically, I can see the character moving on the client, where I'm playing as him, but not on the server, where I'm playing as someone else.
It's showing that we're moving, but I think that the Anim BP isn't being properly replicated to the server. Any help? (Using blueprints)

[proven fog]

Who owns a player's pawn in a regular multiplayer game?

[unkempt tiger]

Bah, I can't find anything about FFastArraySerializer usage online, was the documentation altered somehow? I remember I found some useful info on it but now there's nothing coming up

Does anyone know where I can some reading on it in the source code?

[empty axle]

NetSerialization.h

[unkempt tiger]

Oh right, that just slipped right out of my memory, thanks

[spark owl]

I'm having this issue where overlap events are triggering when they shouldn't be on multiplayer. So to explain exactly what's happening, the game is a fast paced soccer game, sometimes the on begin overlap function for the goals will trigger even tho the ball hasn't gone into the net. It only happens when the ball is being kicked at high speed and the goalkeeper hits the ball away or on very rare occasions when it hits the crossbar/posts. This is an example of it happening:

i posted this the other day but didn't get any solid solutions, only workarounds

[jaunty hazel]

im trying to change a text render when joining the server but it wont update from the default

is there anything im doing wrong?

[sinful tree]

RPCs are fire and forget. Unless the variable that is being set is replicated and being set on the server, the default value would only load on other clients that join after it was RPC'd.

[jaunty hazel]

so how do i fix this?

what are RPC

@sinful tree

the array is not changed. its the text thats being changed

[sinful tree]

Remote Proceedure Calls. Whenever you're using an event where you say "Run on Server", "Run on Client" or "Run on All" that's an RPC.

How does all of this get fired? is it on begin play of something? Is it triggered by the player requesting the text renderer changed?

[jaunty hazel]

yes

in the game mode blue print

[sinful tree]

Game mode doesn't exist on clients, so there's another problem.

You should give a good read through eXi's network compendium.
https://cedric-neukirchen.net/Downloads/Compendium/UE4_Network_Compendium_by_Cedric_eXi_Neukirchen.pdf

[tropic snow]

Got this issue.. anyone know how to fix the lag? https://forums.unrealengine.com/t/spectating-when-dead-in-multiplayer/115021

[tepid pawn]

Epic Online Services. Is that just interface tools for servers? Or is it server access?

[fossil spoke]

@tepid pawn We have a channel for it.... #epic-online-services

Ask your question there...

[ebon plume]

I'm running some server RPCs in the player state. I'm calling these in the local player class. (E.g., ClientRequestblahblah)

Is there a particular reason for running these in the player state ? I feel like this is dumb.

Can't I just do it all in the character class ? -> the actual functions / events

[tepid pawn]

Thank you!

[blazing spruce]

Yeah with steam, haven't tried it with Epic but yeah its something thats broke with 4.27 as the same setup works in 4.26, im gonna test and see if it works in UE5 instead

[quasi tide]

When he drops it, the server needs to be the one to drop it

[woven sinew]

Is it normal behavior that traces on clients don't hit any replicating actor spawned by the server ?

[dull lance]

Reported to mods

[chrome bay]

<@&213101288538374145> 🔨

[rancid flame]

I'm trying to set the actor rotation in a way that replicates. Inside the ACharacter's tick I'm calling SetActorRotation but it's not replicating, what should I be using instead?

[kindred widget]

Usually Characters are rotated via their controller's ControlRotation.

[rancid flame]

It works on the listenserver for its own character but not on the client, it seems like the server isn't accepting it or replicating it?
I've tried wrapping SetActorRotation in an event that gets called on the server but that's not it either

[rancid flame]

Oh i'll try this

[kindred widget]

Bear in mind Control Rotation is often set locally.

Usually any form of server authoritive rotation set for character requires a manual override via a new replicated property or a ClientRPC.

[rancid flame]

Yeah it seems like that's not being replicated either

[kindred widget]

CMC might have something for that though. It does that for characters.

I wonder how it overrides clients rotations.

[warm sequoia]

hey guys, I am doing replication so when my character picks up an item it disappears for everyone, but when he drops it, only the character that dropped it can see it, no one else can... can someone watch my screen and quickly tell me how to fix that? (idk why its not running on the server)

[rancid flame]

@warm sequoia It depends on how you're spawning the object, you probably need to tell the server to spawn it rather than calling SpawnObject on the client? I'm just guessing I'm new to MP

It looks like the listenserver is replicating to the client, but the client is not replicating to the listenserver.
AimingRotation is not set to replicate...

[kindred widget]

Odd. I seem to be missing an include somewhere that I can't find for Push Model replication.

UE 4.26.2

#include "Net/Core/PushModel/PushModel.h"```
These are both in the cpp file.

Only using DOREPLIFETIME_WITH_PARAMS_FAST and MARK_PROPERTY_DIRTY_FROM_NAME macros.

Getting an Unresolved External Symbol error.

[rancid flame]

Did you check your build.cs?

[kindred widget]

Oh. I don't know how I missed that. For some reason I thought Pushmodel was under Engine. Apparently it's NetCore. 🤦‍♂️

[spring vortex]

Is it possible to get the clients game instance?

[random verge]

I'm reworking some OWS stuff and I see it stores each player's session GUID in their player state. This is a very bad place to store this right? I figure in the context of how OWS uses it, the player controller would be the appropriate place to store it, correct?

[violet sentinel]

you can just have RPC from server to client to modify it . GI are local to each client

[violet sentinel]

depends, usually player state holds all player-specific game data

[spring vortex]

I'm just trying pull a setting from the main menu and set a repnotify with that value, not sure if that is even possible

I tried using the player state but wasn't having luck testing locally

[random verge]

I see as that because each player's playerstate will be replicated to all clients, having the actual sessionid for each player in it would be dangerous. Unless the server maps the actual Id to dummy ones for each client so it can't be hijacked

[violet sentinel]

you can have it replicate only to owner

(via various rep conditions)

[random verge]

Oh I didn't look know you could override it like that. That's actually pretty handy.

It does make sense for it to be replicated to all though in OWS, I just think moving the session id would be a good idea so only the owner and server know the session id

[spring vortex]

Just tested on a steam build and it works!

[finite portal]

Hi guys. So I have an AProfile* that is stored in the PlayerState, and I have this set to ReplicatedUsing. I'm noticing that when the server's PlayerState's Profile is set, the profile isn't 'empty' (not empty here meaning that they aren't the default values within Profile and that custom data has populated it). However, when this replicated AProfile* arrives on the client in the OnRep method, it's constructing a new AProfile (which makes sense, so it exists on the client), however none of the values that were in the server's AProfile arrive on the client. I have all values within AProfile set to replicated, as well as the actor itself. Any ideas?

void AProfile::GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const
{
    Super::GetLifetimeReplicatedProps(OutLifetimeProps);

    DOREPLIFETIME(AProfile, Team);
    DOREPLIFETIME(AProfile, bIsPlayerControlled);
    DOREPLIFETIME(AProfile, PlayerOwner);
    DOREPLIFETIME(AProfile, AIOwner);
    DOREPLIFETIME(AProfile, bIsProfileEmpty);
    DOREPLIFETIME(AProfile, Units);
    DOREPLIFETIME(AProfile, TurnInfo);
}

AProfile::AProfile()
{
    bReplicates = true;
    bAlwaysRelevant = true;
    SetActorTickEnabled(false);
    
    Team = FTeam();
    bIsPlayerControlled = false;
    PlayerOwner = nullptr;
    AIOwner = nullptr;
    bIsProfileEmpty = true;
    Units = TArray<AUnitBase*>();
    TurnInfo = FTurnInfo();
}

void AArcanumGenesisPlayerState::OnRep_PlayerProfile(AProfile* NewProfile)
{
    PlayerProfile = NewProfile;
    if(PlayerProfile->IsEmpty())
    {
        UE_LOG(LogTemp, Warning, TEXT("ON REP E"));
    } else UE_LOG(LogTemp, Warning, TEXT("ON REP NO E"));
}

[vague spruce]

I have a dedicated server in a linux machine and I'm running the client in windows, i can`t connect to the server at all. The ports are open and working, i can ping them from windows and i get a valid response. But in the game server the is no connection to the client.

[violet sentinel]

OnRep_PlayerProfile(AProfile* NewProfile) it is not new profile but old one

onrep args always used to get previous values

OnRep_Score(int OldScore) etc

also you don't need to assign to it, or just remove parameter unless you need to keep track of old value (Which i'm not sure if works for actors)

[sterile plaza]

You can set static mesh components to replicate. And then clients will display the mesh that was set on the server. What if the client doesn't have that mesh loaded? I'm doing an async load on the mesh on the server, but if it's just replicating, there's no comparable code on the client.

It looks like it has to run the OnRep, because there's work to be done when a mesh changes. But I don't see anything about loading the mesh.

I guess the data sent down from the server is sufficient...

[violet sentinel]

one thing is data from server, other thing how it handled on client

if replication simply tries to FindObject then if it is not loaded - loading would fail

you may want to add a path to asset and replicate it instead of UStaticMesh* and relying on SMC

[rancid flame]

Should I be putting health in a component on the pawn, or inside PlayerState?
If it's on the player's pawn, couldn't another player's pawn get removed because they're too far away?

[grizzled stirrup]

You can fix this like so #online-subsystems message

[violet sentinel]

on pawn

player state is a layer above, for thigns like personal kill counts, stats etc

[ebon plume]

I was told that replicated variables such as health/ etc was stored in the player state.

Im guessing this was false info.

[clever plinth]

Trying to understand the expected behavior in the following scenario:
(1) On a given frame, server spawns an actor w/ bReplicates=true
(2) Server adds pointer to that actor to a replicated array: TArray<AActor*>

Now both the actor itself and the array need to replicate to the client. Is the replication of the array always deferred until the spawned actor arrives at the client, or is there a possibility it will simply replicate the array with a null element to denote the actor (which has not arrived yet)?

[sinful tundra]

Quick question: Assuming the same listen server host, are unique net ID's always the same for clients that have joined that listen server? (For example, if a client leaves and comes back another day)

[rancid flame]

How hard is host migration in UE4?

[hollow eagle]

Assuming you want it to take over from random host disconnects... impossible if you don't replicate everything to everyone at all times (or at least the minimum data required to reconstruct everything the new host would need).
Aside from that... still hard, but it's probably possible to do in a systemic way. You'd need to have some sort of system (probably a server you run) decide on who the new host is, have that new host save the state of all replicable objects from the current game (likely possible by just iterating over all actors and checking what needs to be replicated), have the new host start a new session + restore the state of those objects, have everyone connect to the new host and restore the state of any players.
It's not simple and something you'd want to avoid having to do unless you absolutely can't host dedicated servers (host migration is a bad player experience, and relying on people to have good enough connections to host is even worse).

[rancid flame]

Thanks! So I guess it would never be seamless, players would have some time leaving the old host and joining the new one, even if they didn't lose progress.

[hollow eagle]

Correct, it will never be seamless. See: any older game that uses host migration 😛

I have very vivid memories of sitting around looking at a scoreboard in halo 3 waiting for host migration to complete...

Something that's true P2P wouldn't necessarily need host migration to deal with disconnects but... that's beyond the realm of what unreal's built in networking supports.

[hexed thunder]

anyone know of common issues with steam voice in ue4 for p2p to improve performance? it is laggy hearing other people talk

[ebon plume]

PainCausingVolume not working. I feel like this is networking related.

I have a cpp function for OnTakeAnyDamage()

I can call apply damage and its binded properly.

In BP i was testing by making a custom event that runs on the server for ApplyDamage. This works.

The PainVolume does not. I checked collision settings.

Using UE5

[jaunty hazel]

Guys, is there any way to call the gamemode to do something

or recive information

[ebon plume]

To execute a function / set / get variables ?

[jaunty hazel]

yes

[ebon plume]

Cast to GameMode.
GetGameMode for the object reference.
Use "AsYourGamemode" to do things

assuming it's BP

[jaunty hazel]

this works in multuplayer

?

[ebon plume]

What do you mean exactly ?

What are you trying to do

[jaunty hazel]

im trying to press a button on a widget to send the message to the gamemode to print a string

to test the connection

[hollow eagle]

Gamemode only exists on the server. You cannot retrieve it from a client.

Read the network compendium (see this channel's pins), it explains all of this.

[finite portal]

That actually makes a lot of sense. There's a few OnReps I need to go change now. Thank you!

[sinful tundra]

Anyone know? Just wondering if I should store a list of unique net IDs in order to load up the proper data when it shows up again.

[violet sentinel]

things that specific to pawn must be in pawn
things that specific to player must be in player

health of unit is property of unit, amount of gold player has is property of player

[twilit radish]

Depends on the game though.. If you have a game where for whatever reason you can switch between pawns but they share the same health per player then it obviously wouldn't go in the pawn. Just think logically about it: "Is it a state that is directly connected to a pawn, or is it more of a general concept that isn't necessarily related to a pawn and thus should go somewhere else?".

[violet sentinel]

usually they are unique identifiers of players. for example steam id is being used in steam OSS, not sure about others

[violet sentinel]

yeah, that is theexception

if some kind of global health that is not related to pawns specifically

that way it won't be a property of pawn

[twilit radish]

🙂

[amber slate]

Hello

How can I use epic online services with unreal engine?

I'm confused and there aren't a lot of tutorial out there

I want to be able to login and have a friends list system

[silent valley]

You can ask in #epic-online-services - but everyone I know who uses EOS and Unreal uses the EOS Online Subsystem plugin by Redpoint Games rather than doing it directly. There's no official plugin that I know of at the moment.

[amber slate]

I tried to use this plugin but I never got i working (since it's the free version there is no support)

[silent valley]

Maybe you should pay for it then if you really want to use it 🙂
Otherwise you have a long road ahead of you figuring it out.

[jaunty hazel]

sorrry im here again but im haing the player spawn as a camera to select teams and i was wondering how i can make them control another actor when they select thier teams

[amber slate]

I don't have 120$ :/

Also there are a lot of tutorials for steam subsystem

but if I use it will I have to post my game on steam?

[silent valley]

Yes I think so. Steam will also cost you $100 for a Steam product code.

[amber slate]

dang

Honesty the price isn't an issue

It's just that I don't think my game is good enough to be released on steam

Is there any subsystem that aren't for specific stores

Like a universal one

So I can just host and join games

[kindred widget]

You can use Null. It requires IP addresses for connection though if I recall correctly.

[amber slate]

is there any tutorial?

Because most tutorials are for steam

[silent valley]

NULL won't allow you to search and find online games though

[amber slate]

it's fine

It's for a small game to play with my friends

[silent valley]

Null is a good starting point then

[amber slate]

ok