multiplayer

[winged badger]

once the ball is on a ballistic trajectory

its somewhat predictable what happens next

i say somewhat because physix is not deterministic

[thin stratus]

And now someone would come in and say "BUT CHAOS IS NOW"

And we yet have to discover this

Also, fwiw, I usually do Balls with ProjectileMovementComponent and setting the "InterpolatedComponent" to a Mesh to make it look a lot smoother.

[winged badger]

chaos is only "out" since 4.22 i think it still doesn't work 😄

[thin stratus]

In C++ one can also set the Velocity of the Component to the one of the Actor in PostReceiveVelocity or so

[winged badger]

but generally, once your player contact with the ball is done

ball more or less follows the same rule as to where it flies to next on each machine

so it doesn't need a tick by tick position update by RPCs

it just needs a correction here and there

[thin stratus]

Using Physics for this is really unstable. It's not even "somewhat", it's really shitty

Idk what kind of Ball we are talking about, but if it's really just a bouncing ball, use the ProjectileMovementComponent

It solves a lot of headache and has some interpolation for the mesh build in to smooth stuff out

It's basically the best you can get before coding your own or doing illegal stuff like making the ball a Character

[arctic mesa]

guess i could also make a death zone where it destroys the physics object once it hits the deadzone?

[unique cloak]

?

[arctic mesa]

so from what i gathered from our chat, this is what i did

client gets the actor's transform and passes it to the server event, that passes it to the multicast event, that passes it to the setworldtransform node

[arctic mesa]

well, it does indeed function like you said, zlo, it's teleporting

however, setting US to run on every tick freezes the ball, as it's trying constantly to set it's transform

...i should look for a different approach. the ball DOES float when telekinesis is active, meaning telekinesis deactivates the ball's "gravity"

[valid imp]

I have a fixed size & fixed order large array of ints I want to replicate.
Say I create an FFastArraySerializerItem (with my int side that I want replicated) and set the ReplicationID to the element index, then in OnRep_MyArray I sort the array. Have I then indeed achieved correct-order replication?

[prisma pelican]

anyone know if draw debug is replicated?

for testing purposes

[pallid mesa]

#multiplayer message

[dark edge]

no its not

[kindred ether]

could someone please help me with some replication im trying to - a float inside a actor but the client cant change it for the server or other clients i have been stuck with this for so long i took 2 weeks of the project bc this one thing and i still cant fix it for the life of me xD

[fathom aspen]

Honestly that's a basic question that even if you bypass by a help of someone it will be just a matter of time till you ask similar questions. So let me introduce you to this: #multiplayer message

[kindred ether]

yeah if server does it it will replicate to the clients but not the other way i have tried using events but the client cant run my event that has run on server

could you pls join vc to watch the stream and i will show you even if you mute

[mint drift]

Hey guys I am trying something here and if someone could give a hand would be awesome.
Goal: My character dies and only other dead players will be able to see this dead character. The alive ones dont see it. Only dead see dead

Any tips on it?

[fathom aspen]

That's normal, dead have their world, we have ours
Well all you have to do is literally replicate the death event, at a very basic level, say you replicate bDied and inside OnRep_Died you drive animations, etc.

[fathom aspen]

That usually happens because the actor you are trying to RPC from has no net connection

[kindred ether]

and how would i give it net connection

[fathom aspen]

You make sure it's owned by the client, aka PlayerController/Pawn/PlayerState

Or it's one of them

And that it's safe to RPC at that point in time

[kindred ether]

idk how to give it a owner

[fathom aspen]

SetOwner is one way

[kindred ether]

would i make the client spawn it?

[fathom aspen]

Then it's not replicated and you can't RPC at all

You spawn it on the server, make sure it's replicated

SpawnActor has Owner pin you can use it too

[kindred ether]

what if theres more then one client

[sinful tree]

Then you can't really replicate through that actor. You'd have to replicate through a player owned actor (Like Player Controller, Player State, or their controlled pawn)

[kindred ether]

i cant make all the clients own it tho??

[sinful tree]

No

[fathom aspen]

No, just one client

[mint drift]

I dont mean I want to see them dead by animation, I mean.... literally SEE, like bHiddenInGame

[kindred ether]

so it wont be replicated for all clients only the one??!!

[sinful tree]

Spawning a replicated actor on the server by default will end up being replicated to all clients.
You cannot call Client -> Server RPCs on replicated actors that are not owned by the client attempting to make the RPC.

So if you want your client to be able to interact with said actor, you'd have to call the RPC on their Player Controller/Playerstate/Controlled Pawn, likely passing through a reference to the actor they're trying to interact with, and when finally running on the server, the server can access the actor, and run whatever functions or set any replicated variables on that actor.

[kindred ether]

any vidoes on this bc thats confusing af to me lol

im new to replication so im clue less

[fathom aspen]

Well the answer is not that different, you want to hide pawns when that OnRep_Died fires unless bDied is true, which means "don't hide dead player if I'm dead"

[dark edge]

What specific game mechanic are you trying to do?

[amber saffron]

Same been at this for a couple days now and still cant get a single actor to spawn on the server for everyone to see

[dark edge]

Can't get it to spawn or can't get others to see it?

A replicated actor spawned on the server will be there for all to see.

[amber saffron]

i can get it to spawn on the server but cant get others that join after to see it

[fathom aspen]

You already been pointed to them: #multiplayer message

[fathom aspen]

That's not how you spawn replicated actor

[sinful tree]

That's not spawning a replicated actor on the server, that's multicasting which gets everyone to spawn their own copy.

[dark edge]

That is not how you'd spawn a replicated actor

[kindred ether]

a food system that will have a set food amount and when you eat from it it will - from the food amount and add food to your hunger bar but when one player - from the food amount other players dont see that happen

[mint drift]

oh nvm. Lost little context

I will focus on my issue, too complex for here as well

[dark edge]

Do you already have a replicated food variable and is it shown in your hunger bar?

[fathom aspen]

This should get you back into context: https://vorixo.github.io/devtricks/stateful-events-multiplayer/

[dark edge]

Show your variable replication settings and how your hunger bar is updating

[kindred ether]

im not trying to replicate the players hunger im trying to replicate the food amount

im not really sure how i could show you what i mean without you in vc

discord dont let me send vids

[fathom aspen]

But it does let you send screenshots to your code

[kindred ether]

im not sure if this is the bit you want lol

[dark edge]

ew no dont do that

replicate a variable

[fathom aspen]

This bit is enough to say you are doing things incorrectly

[kindred ether]

thats what people in vc said to do lol

[dark edge]

Start from the beginning. Show your player hunger variable and how you're reducing it and updating the UI

gotta make sure that part is correct first BEFORE dealing with refilling it

The only RPC in this whole setup should be between your input and the "eat" mechanic

[kindred ether]

its just a float that get - on event tick but that dont seem to be the problem

[dark edge]

is it a replicated float?

[kindred ether]

no bc hunger dont need to be replicated between characters

[dark edge]

Just show it, you'd be done by now

yes it does

[kindred ether]

why

[dark edge]

unless you want client to be able to say what its hunger is no matter what the server thinks

[kindred ether]

its replicated now

[dark edge]

ok so now that it's replicated any change to it ON THE SERVER will be replicated to the client

show how you're making it go down over time if you're doing that

If you're not then proceed to making the Food variable on the feeding station replicated as well

[kindred ether]

mean this?

[dark edge]

As long as that's running on server only then you're good. On a timer I'm assuming?

[kindred ether]

thats in the player character

[dark edge]

OK then
Then it's as simple as

In Character:
Input -> Run on Server Event -> Do the interaction mechanic to talk to whatever you're nearby (sphere trace, get overlapping actors, whatever) -> Call Interact or Eat on the food station (passing over the character that's doing the interaction/eating (self))

In FoodStation:
Event Eat -> do the math to figure out how much food is being transferred -> remove that much from Self's Food, add that much to InteractingCharacter's Food

[kindred ether]

on all players

[dark edge]

Serverside or clientside or both? Do you know that every replicated actor exists on both sides?

[dark edge]

Show what triggers that

[kindred ether]

this?

[dark edge]

You should do the Hunger thing on server only

and tick is probably overkill but that's fine for now

if you're doing it on tick, you'd want to use DeltaTime in your math or it'll go faster or slower based on tick rate

just put a HasAuthority switch before Hunger

also that should NOT be a run on server event, just a plain event

Event tick happens on server too

[kindred ether]

okay done all that

[dark edge]

To reiterate, here's the code paths.

In Character:
Tick -> HasAuthority -> True -> Update Hunger
-> False -> Update UI?

EatInput -> Run on Server Event -> Do Stuff to get at the food station -> Call Eat on it or whatever, passing over Self as a parameter (EatingCharacter)

In FoodStation:
Eat -> Do math -> Update self.Food and EatingCharacter.Food

[kindred ether]

yeah that made 0 sense to me 😂

[kindred ether]

still dont see how all this is going to fix the problem 😂

[amber saffron]

Currently away from my computer, but here was my original attempt at trying to replicate my actors
#multiplayer message

I have since then tried to re adjust based on some advice from some of you, but have not made any progress. From my first attempt, what needs to change/be removed/placed somewhere else?

Trying to: spawn actors on server(will most likely be an actor pool, but for now just these actors), each player will be able to pull from these actors to build their own things that others can see but not touch(at least for now) (the actors created are child's of a master actor but are set to replicate)

[kindred ether]

you still there?

starting to think im never going to be able to replicate this lmao i have had it like this for like 2 weeks now

[dark edge]

Test the first stuff on tick, does it work?

you update Food on server

you update UI on client

Food is a replicated variable

[kindred ether]

yeah the players food bar works it just the food itself that dont

[dark edge]

You set it up the same as on the player

replicated variable

it can literally be the same thing if you make a food component

[kindred ether]

it is a replicated float but that dont work

[dark edge]

Show your code

how can we help if we don't know WFT you even have?

Show the setup for the feeding station and all the code in it

[kindred ether]

could you join vc even if you mute then i can stream and it will be much more easy

i cant really screen shot all the code at once

[dark edge]

OK show the code path from input to talking to the food station

you presumably walk up to it and press a button right?

show that

[kindred ether]

then when you press e it will check if inZone is true and if so it will eat

in the player character

and the (box) is just a box collision

[dark edge]

That's a little goofy

[kindred ether]

i know but its simple and i dont need to over complicate it

[dark edge]

Do it more like this
Press E -> Run on Server Event
Run on Server Event -> Check overlaps or whatever -> Eat

Who has the trigger, the character or the zone?

[dark edge]

This will crap out as soon as more than one character exists

[kindred ether]

the actor has the box collision

[dark edge]

and it's sorta ass backwards anyway

Here to start with, just get actor of class for now

E -> Run on Server Event

Run on Server Event -> Get actor of class -> Eat

You would later replace Get Actor of Class with your general "select actor to interact with and call interact on it" logic

[kindred ether]

idk why i have a stuff on released xD

i dont see why i have to change these rn when they dont seem to be the problem

@dark edge you gone again?

okay well ima go sleep now bc this way clearly isnt working

[dark edge]

I'm working on stuff.
You should do
E -> RUN ON SERVER EVENT -> do the logic

your input is never making it to the server

[distant vault]

Hello, I am trying to get access to players info stored in the game mode through player controller but I am get errors. Can anybody help?

[sinful tree]

Game mode doesn't exist on clients. If that begin play is in the controller, or any other replicated actor, then that fires on the client machine too, and when running on the client, it can't get the game mode.

[dark edge]

Don't store player info in game mode

[distant vault]

This if for all the players connected to the game mode

the actual player information is in the controller

[waxen canopy]

Hi All, Good day...

We have tried to use Thirdpersonsample provided by Juaxix and made our own thirdperson game...however the moment we a room is joined the players fly off...I have been discussing this with juaxix and he suggested few settings but they are already enabled. Does someone have any idea to solve this issue...There are no errors. It says players hv joined the room.

[sinful tree]

This is storing player info in the game mode. You should just be storing that data in the playerstate. There's no need to have an array of player info as each playerstate should contain the data about the specific player, and if at any time you wanted to look up all the players in an array, you can use the gamestate's Player Array which is an array of all the connected playerstates.

[rose egret]

dose UCheatManager support RPC ?

[warped steppe]

not sure if it has replication out of the box but it's fairly attached to each player so you could pass it off to something that does pretty easily

just my guess though, never looked into it

[rose egret]

I dont remember well but I guess console coomand is sent to server if its cheat

🤔

[prisma snow]

I'd assume it's not, but it should be easy to manually RPC

[kindred ether]

omg i feel so bad for wasting your time i was falling asleep and thought of doing all that stuff i had in the the actor to - the actors float in the player character and it works fine xD

and im about to move the box collision into the player character

[dark edge]

You can also just do a trace on demand when you want to interact with something

I do a sphere trace -> filter -> sort by some metric -> choose the thing to interact with

[kindred ether]

ty for telling me all the stuff i need to go fix to lol

[kindred ether]

okay

[dark edge]

something like "choose closest actor in trace that implements InteractionInterface or has an InteractionComponent" is the usual way to do it

I use an Interaction component but many people use an interface

you'd just include the InteractingCharacter in the interface call then the feeding station knows WHO to give food to etc

[elder sable]

Hi, i'm making an example project for a subsystem and i can't get the session from the null subsystem with

 OSS->GetSessionInterface()->GetResolvedConnectString(SessionName, StrServerURL, NAME_BeaconPort);

I was using steam subsystem before that, is there something specific with the null subsystem ?

[true spade]

Hi, I have a question about nameplates above heads in the multiplayer game. So how it's suppose to be done, I tried to do it with Player controller on begin play Im getting player display name and setting widget text, but the problem is only host (server) can see those, and clients can't. And I'm even using Multicast for it and still not working on clients. Can someone please explain how to do it, it will help me a lot. Thanks in advance 🙂

[elder sable]

Players can't see others player controllers, so you can use the playerstate, when it's replicated you can display your values

[true spade]

Thanks for the reply, I tried using playerstate but I got the same problem, clients still can't see other players names there, only host

[elder sable]

Then your code is wrong

[true spade]

Can you explain a bit how it's suppose to be done?

Currently in the character Im getting player state and calling multicast in the begin play to update name widget

[elder sable]

Do you check if your playerstate is valid ? Do you bind your delegate before your broadcast ?

[true spade]

Bind delegate? Currently not using any dispatchers, the player state should be valid (I guess) since it executes some code in character's begin play for the controller side and after setting name

[elder sable]

What do you mean by "multicast" then ?

[true spade]

This one, and calling Server_SetPlayerName in the begin play

[elder sable]

You don't need rpc you just need properties

[true spade]

Then I'd need just in the widget get owning player player state and get playername it should work?

I tried even that and it didn't work

I the widget I tried this one too

[elder sable]

And where do you check if your data are available here ?

[true spade]

Currently here I don't

[elder sable]

You need to wait for data to be replicated before displaying them

playerstate onrep etc ..

[true spade]

So how I can manage that? I didn't use playerStates often

[elder sable]

You can make a delegate and broadcast when the data you need are ready

[true spade]

Form where I should broadcast, and when?

[fathom aspen]

From PlayerState::OnRep_PlayerName

[true spade]

Oh, kk. I just had the replicated player name, and not repNotify till now

Gonna try that now. Thanks, I'll let you know after trying

[rocky night]

Hi, so i have for example a Crate which a player can loot. Unfortunatly i overs ee something. Other Players can interrupt the Process when someone is looting (He is holding a key down) It is checking with a (boolean is looting?) Which i set at begin of loot liekis it false then loot if not.. its busy. Ok that works BUT! when the other player which is not looting press and then RELEASE the Key its interuppting the looting player.... dang stucked on that

abover of course the first boolean is set to true when interacting... but it goes through in the screenshot.... its a bp interface which says key relase and asks then for the boolean.. it doesnt work it goes through. The code is in the lootbox as it holds the interface... @fathom aspen sorry for the ping but i am afraid it could go under here

[glacial pollen]

Long time no see you guys. I have a real doozy for you guys today:
Player A and B spawn near each other. Both can aim and linetrace to the other.
Player A moves 5 feet. Player B SEES A move 5 feet, but line trace only works at ORIGINAL spawn location.

If I add a cube as a child of the skeletal mesh, everything works, so this is a particular component issue rather than a general config/multiplayer/auth issue.

In the 5+ years in Unreal, I've never seen anything like this:
Left: Player A has moved, Player B is now aiming at A's new location, but no hit result!
Right: Player A has moved, but Player B is still aiming at A's original location, hit result!

[true spade]

Hi, I tried that one on PlayerState::OnRep_PlayerName and It's not working, I'm just getting default string value, "no name"

[rocky night]

wierd no clue but set component replicates to true on the mesh does something?

[glacial pollen]

I'll double check, it would be weird that the location of the mesh moves visually, but not "physically" if it was a replication problem.

[fathom aspen]

Pinging random peeps is against #rules . I only help when I want to

[rocky night]

sorry was thinking you didnt see it.. ok wont happen again

[elder sable]

Never ping a Wizard

[rocky night]

mh , tough one

[rocky night]

yes just learned it 😄 hope i dont het the wrath spell now

[rocky night]

other question... i give a player a stealth suit while playing... it glitches so the player moves and it goes to invincible is he stops moving it bugs to unreal standard material.. doenst happen with lit materials

[young kestrel]

Thanks to this discord I finally was able to understand how that FCharacterNetworkMoveData stuff works (more or less)
I also was able to confirm that my code works (partially)
Which does give me the hope that I will actually be able to finish the basic framework for my project at some point in my life.

I also was able to cleanup the code now.

[elder sable]

I'm using OSS->GetSessionInterface()->GetResolvedConnectString(SessionName, ServerURL, NAME_BeaconPort); to get the server address, i was thinking to change only the game port but can the IP be different for the beacon and game port ?

[drowsy meteor]

Hi everybody, I'm very new to unreal engine and i've been understanding a lot of things but i just couldnt figure out how to work with multiplayer, any body have some ressources for a " beginner in multiplayer course "

[prisma snow]

in the pinned resources, there should be a cople of compendiums that are very good to get a good grasp of the basics of the system

[drowsy meteor]

thnx very much :d

[prisma snow]

I recommend you this one very much: https://cedric-neukirchen.net/

also the one from WizarCell

[drowsy meteor]

thnx a lot i appreciate it

[prisma snow]

np, have fun

[torpid girder]

hello, i am probably doing something totally wrong, i've started my client in spectator, i then select a character, and call my function stopspectating on my PC, from here i set bPlayerIsWaiting = true; and call ServerRestartPlayer(); however i think this isn't the right way to change from spectator to playing

[fathom aspen]

It depends how they were switched into spectators. You just switch them back (undo)

[torpid girder]

i launched them into spectator mode when the game mode starts, so once they have their character, i can't for the life of me figure out what will switch their state into playing, i assume there must be something else that wraps switching state i haven't found yet

i am defo doing the wrong thing, probably got my terminology muddled up too

so i set bStartPlayersAsSpectators = true in my gamemode, yes great, my player character is spawned, i open up a character selection widget, yes good select the character, so not to introduce any other complication no code to use the selection has been implemented. now i need to execute something that would have taken place by default if i hadn't set bStartPlayersAsSpectators to true

i assume i have to make a call from the client player controller to the server player controller to call something in game mode

[fathom aspen]

Well the thing you are missing is my message from a few days ago: #multiplayer message
You have to understand that a SpectatorPawn already gets spawned by default for you regardless of that setting. That setting you set to true in GameMode is meant not to spawn a Pawn so the SpectatorPawn doesn't get destroyed in return, and that way you stay in NAME_Spectating state. I talk about that in here: https://wizardcell.com/unreal/persistent-data/#gameframework-objects-creation-order-and-calls (SpectatorPawn section) @torpid girder

[torpid girder]

now that makes sense

[fathom aspen]

And in the link from days ago I speak about how I switch from playing to spectating state and the other way around

Sometimes answers are a few clicks away

[torpid girder]

yes i understand, what i am seeing now makes sense

ah and now back to the problem from this morning, when i change the state, the controller tick then switches it to inactive

[fathom aspen]

Debug and find out why

[torpid girder]

i know what is happening, which makes me think this solution you show (same as what i thought i had to do this morning) appears wrong, the aplayercontroller on tick comes along and sets the state to inactive because nothing was spawned, unless the code to spawn and player into playing mode is separate, which then begs the questions if i have to handle this myself why do i need states

[fathom aspen]

It does that only if you go into NAME_Playing state which you shouldn't be going into

[torpid girder]

i had a feeling i am doing the wrong thing, so to enter a playing state, i feel like i should be calling something like ServerRestartPlayer()

[distant vault]

Anybody know why it fails to cast? I'm trying to get asceses to the players state. this is in a widget

[sinful tree]

Probably depends on where and what event this is being executed on, either that or you haven't set the Game Mode settings to use that particular playerstate class.

[fathom aspen]

You will need to do that at some point, note that changing to state NAME_Playing calls BeginPlayingState which does nothing by default, however you can override it and do w/e you want

[distant vault]

On construct

[sinful tree]

Of what?

[torpid girder]

ah! i think that is what i am missing

[distant vault]

of the widget

[fathom aspen]

Also note that this function will be called on both server and client, considering you have to change state on both sides, so be careful to check authority before you RestartPlayer

[distant vault]

I already made the player state part of the game mode

[torpid girder]

I think i haven't even spawned my character yet, so its just going to go back to inactive

[sinful tree]

Are you creating this widget on begin play of something? In multiplayer it's not guaranteed that the playerstate is valid on BeginPlay of the player controller on a client.

[distant vault]

I have a hud class that creates the widget

maybe the player state hasnt had time to spawn yet

ill add in a delay

[torpid girder]

i am sure i have this totally wrong, so i have a spectator pawn, i call for a state change, i transition from spectating, the spectator pawn gets destroyed, but nothing triggers the creations of a new pawn

so on tick the player controller picks this up and sets the state to inactive

[latent heart]

Do you have a default pawn class?

[torpid girder]

yes

it used to spawn in before i set the gamemode to bStartPlayersAsSpectators = true;

[latent heart]

Check what it's doing in RestartPlayer - if it's even called.

[torpid girder]

i don't think its even called, double checking

[latent heart]

If it's not called, check what it's doing on state change. 🙂

[distant vault]

It was the delay thanks man

[torpid girder]

i am sure i've done something stupid and i can't see it, but its right in front of me

[sinful tree]

Just be aware that even the delay may not necessarily work - what your trying to accomplish is waiting for the playerstate to be valid, and you can only really accomplish that by overriding OnRep_PlayerState() in a C++ player controller class and using that event to trigger anything that needs to read the playerstate when it's known to be valid.

Example: What if someone has a really bad connection, and it takes 3 seconds before their playerstate is replicated to them? Your delay would still fail on their client.

[quasi tide]

Delay for 5 minutes. If they're still not ready, their connection sucks too much, kick 'em. 🧠

[distant vault]

Thank you for this ill do some research into that

[distant vault]

🤣 not a bad fix

[torpid girder]

ok so if i have this right BeginPlayingState() must contain calls to gamemode to restart the player? it isn't implemented

[torpid girder]

aha, right so that was seriously hard work, i am still not sure why i have to set so many vars to change state, but fine i met the criteria and now time to die and do it all over again 🙂

thanks for your help @latent heart @fathom aspen

[wheat magnet]

is there any built in method for implementing p2p networking in unreal?

[chrome bay]

Outside of listen servers, no

[elder sable]

Does UE create a session by default ? I just make a find session without creating one and there is an existing session

[wheat magnet]

then what is solution for that?

[dusky yarrow]

you literally cant. a player need to act as a "Host" aka listen server for p2p to work

[prisma snow]

Unless there is a crazy reason for p2p, I'd just go listen servers

[wheat magnet]

okay

[verbal tendon]

Just to clarify. There are multiple definitions of p2p out there. If by p2p you mean one player hosts and the other players join. This is built into the engine

There's the Computer Science definition of p2p, and there is what people colloquially refer to as "p2p", as opposed to running dedicated servers. The latter is what UE does, and you can simplify the required implementation by using EOS

[bitter oriole]

P2P, listen server and dedi are three very distinct architectures that are equally common

Unreal just doesn't do the first one

[verbal tendon]

The last time I've seen actual p2p networking in a game, is almost 2 decades ago. I would not refer to it as equally common

[kindred widget]

Doesn't GTA do P2P?

[bitter oriole]

Almost every game does some

How many games kick all players when you lose network?

[verbal tendon]

Uhm... that's not how that works

[kindred widget]

Pretty sure RDR2 online stuff and For Honor do P2P as well.

[bitter oriole]

Listen server = one specific player hosts, with total control over the game, god mode if they cheat, and obviously everyone get dropped if they do

[verbal tendon]

P2P networking used to be a thing back in the days, and it was using full-mesh network topology, for lockstep games. It was horrendous

[quasi tide]

For Honor definitely launched with P2P

[bitter oriole]

Destiny has been doing P2P for 10 years

[quasi tide]

Pretty sure they've since changed it

[bitter oriole]

Everyone does some P2P because servers are expensive

Usually with at least a layer of dedicated servers for player state

[verbal tendon]

Kill me now 😂

I mean ... yes sure, you can do it, just like you could do it 20 years ago

But there's nothing in the world that would motivate me to work on such a game nowadays

fixedpoint implentations are a breeze

[bitter oriole]

If I was going to make a MP game today it would 100% be peer to peer

[verbal tendon]

of course there's a difference when you can just use the implemented classes and networking

I used to write the networking code, down to the low level system socket handling

and we had different classes for linux/windows/mac, because they use different socket types at the OS layer

[bitter oriole]

Well yeah that's socket 101

Or just write the ifdef soup once and treasure it for the next 30 years

At least it's not like the API changes

[verbal tendon]

Now now, show respect to the dead. Let's not bring them up in conversation 🙂

[bitter oriole]

It's all about web4 these days

The RTX 4000 way

rip

[verbal tendon]

Got a plan? 😄

[latent heart]

Why before february?

[dusky yarrow]

crypto mining?

[quasi tide]

Yup. Totally a Laura thing to do.

[dark edge]

I paid $730 for a 6600XT
Kicking myself but I had to play Elden Ring and things were spendy.

[prisma snow]

it has the fundamental problem of n squared number of connections

[bleak moon]

Anyone aware of any known bugs with child actors and standalone testing mode? The child actor isn't showing up on client side even though the actor blueprint is set to be replicated on net load and in general.

[quasi tide]

Child Actor Component?

[fathom aspen]

Your alt is to spawn a replicated actor and to literally attach it to the other actor (all happening server-side ofc)

[bleak moon]

Yep, was just wondering if there was something dumb that I could fix with a tickbox or something

[fathom aspen]

We hoped that was the case since long, but turned out that there were none 😔

[bleak moon]

So this is a pretty prevalent problem? 😮

[fathom aspen]

Or at least that I don't know™️ of any

Yeah CACs are problematic as hell

[bleak moon]

Damn, ok good to know

[quasi tide]

Should probably be removed honestly.

[distant vault]

Hello, I have this event that is suppose to launch the game from the lobby but I cant seem to get it working. Any reason why or any alternate to this?

[weak linden]

Does anyone know if UObject::Rename() is "safe" to use in multiplayer to change owner/outer? Or should I just be using NewObject and providing the old object to copy properties from?

[sinful tree]

What's not working about it?

[prisma pelican]

how to transfer all clients with server to new level?

i dont know what to do after server travel

[bitter oriole]

Just ServerTravel to the new map.

(no OpenLevel needed)

[prisma pelican]

@bitter oriole what do i put for in URL if I dont openlevel?

[lost inlet]

The map name

[bitter oriole]

The "URL" field of ServerTravel

[prisma pelican]

just the map name?

[bitter oriole]

Yeah the map name

[lost inlet]

Yes , with travel args if needed

[prisma pelican]

like this?

[lost inlet]

Same as GetWorld()->ServerTravel in C++

[prisma pelican]

is it same as this one?

[bitter oriole]

Read the doc: https://docs.unrealengine.com/5.1/en-US/travelling-in-multiplayer-in-unreal-engine/

[prisma pelican]

thanks you guys for answering my previous question, i set up the transition map like the doc said, but without open level the next map doesnt open

[elder sable]

Hi, i'm using GetResolvedConnectString to get my lobby endpoint (using beacons) but i would like to get the game endpoint without calling this function again, is that possible to get the game port only ?

[distant vault]

Yes

[distant vault]

It just doesn’t work

[fathom aspen]

That is very descriptive and helpful™️

Debug and find out what's not working/executing

[fathom aspen]

That could happen for a couple of reason at least:

1. ServerTravel being called client-side.
2. bUseSeamlessTravel turned on the departing GameMode and you traveling in editor

[fathom aspen]

I recall having issues with the former a while back and having to switch to the latter

[prisma pelican]

made sure that the servertravel is running on server side

i dont fully understand what the second one means

[fathom aspen]

That's a setting in GameMode in Class Defaults

[prisma pelican]

i turned it on, was i not suppose to?

[fathom aspen]

You can turn it on, it won't work though if you are traveling in editor

Because seamless travel PIE isn't fully supported in editor

In 5.1 it is with the help of a CVAR

[prisma pelican]

i packaged the game to test and the issue is that it brings me back to the main host menu instead of the level i specified in server run

[fathom aspen]

If it brings you back then something is working™️

[fathom aspen]

Have you debugged your code?

[prisma pelican]

thats true

[dim trail]

what is the cost of a multicast vs server rpc?

[bitter oriole]

They serve completely different purposes

Server RPC is client to server, multicast is server to clients

[dim trail]

im looking at a plugin for damage text numbers, they are using a server rpc instead of what i would assume should be a multicast

[prisma pelican]

yes there are no warnings or errors currently showing on compile

[fathom aspen]

My handsomeness seems to be helping 🤭

[fathom aspen]

Figure out what they are and how you fix them. You also share them with us

I have not tried it yet, so that should mean something

[prisma pelican]

what am i suppose to share if there are no errors showing on log?

[fathom aspen]

Sometimes I have to make a sacrifice for our father in heaven to forgive us sinners

[fathom aspen]

Ah there are none, I thought you said there are 😔

But still I would debug what servertravel is doing behind the curtains

[prisma pelican]

i shall take your advice wise man

[fathom aspen]

... wise handsome man

[lunar fox]

You also don’t need to use seamless travel just to bring over connected clients. It’s more if you want to preserve PlayerState etc across maps

[fathom aspen]

Respect level is now at 1000

[fathom aspen]

Honesty it should be preferred over non-seamless when possible

[prisma pelican]

is running servertravel on server enough?

[fathom aspen]

It is enough™️

With turning off that setting in GameMode

[prisma pelican]

you mentioned that it cant be tested in editor

how about standalone mode?

instead of packaged

[fathom aspen]

It can if you do some things

It does in standalone

[prisma pelican]

do you run your own dedicated server usually to test?

or you do via steam or smt

[fathom aspen]

As said, I do standalone

[prisma pelican]

aight

thanks lots beautiful man and woman

[elder sable]

Any idea why GetResolvedConnectString(NAME_GameSession, StrServerURL, NAME_GamePort); returns 10.21.21.2:0 ?

[fathom aspen]

Because that's what it should return?

What type of GetResolvedConnectionString is this?

There are like a dozen of them

But I know the one that returns bool

[elder sable]

It shouldn't be 7777 for the port ?

By "returns" i mean the value of StrServerURL

With Name_BeaconPort the address is 10.21.21.2:15000

So i guess something is wrong for the game port

[elder sable]

bool GetResolvedConnectString(FName SessionName, FString& ConnectInfo, FName PortType = NAME_GamePort) this one from OnlineSessionInterface

[fathom aspen]

And you are using Null OSS?

[elder sable]

Yep

[fathom aspen]

You should probably explicitly specify the port 7777 when you host

If you're not doing so

[elder sable]

But if someone change the port ? Would be better to not hardcode it

[fathom aspen]

I mean you want to pass it as a param or something

There is an option for port iirc

[elder sable]

Oh, yeah i will use a param then, thanks !

[fathom aspen]

But you could also try seeing what happens under the hood when FURL gets constructed, there is UrlConfig.DefaultPort

Maybe it's being messed up at some point

[elder sable]

The DefaultPort of FUrl is valid, the port is 0 from GetResolved...

Maybe it's supposed to be 0 for the game port dunno, don't want to spend too much time on this :p

[shy radish]

hey, is the networking code in v5.1 still the same from previous versions of ue4 (4.27 / 4.26) or has it changed again? because I am following a course by tom looman on creating a multiplayer shooter game and for some reason the weapon actor wont replicate...

[fathom aspen]

It is still the same, though they introduced a new replication system

And in your context you're not using the new system

[shy radish]

could this explain why

void BeginPlay()
{
  if(HasAuth())
  {
    // Spawn Weapon
  }
}

Isnt working on the client because 5.1 has a new networking system?

[fathom aspen]

Again the new replication system has nothing to do with you, neither you neither the course neither anyone is using it

TL is doing that check in BeginPlay so they spawn the actor on server

Considering BeginPlay fires on both server and client, so they are filtering execution

If that code is executing and the actor bReplicates then it should be replicating just fine™️

[shy radish]

but this is my issue the weapon actor is replicated but spawns only on server and not on client which as explained is because the weapon actor isn't replicated

[barren surge]

Does the weapon actor have bReplicates set to true?

[shy radish]

yes

[barren surge]

Have you defined a GetLifetimeReplicatedProps() function on the actor that owns the weapon and correctly declares the weapon property var?

[shy radish]

yes

[barren surge]

🤷‍♂️

would need to see more of the code then...

[chrome bay]

willing to bet it's relevancy related

[shy radish]

you mean net relelvancy?

[chrome bay]

yee

[shy radish]

tried it too no result

[chrome bay]

Impossible to say then really without being able to debug it

[shy radish]

how would you debug this?

[chrome bay]

Well you need to figure out why it isn't replicating. Make sure its spawning first, make sure it's not being destroyed by something else, make sure it is in fact replicated etc. Check logs

But it's going to be specific to your code/project

[barren surge]

the character holding the gun, does it replicate movement?

[shy radish]

its derived from ACharacter class so yes

[barren surge]

I didnt think ACharacter has replication turned on by default

[shy radish]

I tried to assign a key to spawning the weapon but the results are the same regardless of the time, Server spawns client doesnt

[shy radish]

just checked it was turned on so wasnt the issue

[wheat magnet]

does android in unreal support dedicated multiplayer?

[shy radish]

ok I finally managed to figure it out why... On beginPlay because of the new input system where you need to initialize the context first I did a cast check and returned if cast failed so anything after that wouldnt go through

sorry for bothering you guys with these dumb things 😅

[wheat magnet]

?

[sinful tree]

Are you trying to run a dedicated server on an android, or are you wanting an android device to connect to a dedicated server?

[wheat magnet]

"wanting an android device to connect to a dedicated server"

like oculus quest 2.

[sinful tree]

I can't fathom why it wouldn't work.

[wheat magnet]

in other words, I have oculus quest 2. I want to package .apk game for quest 2 which connect to dedicated/listen server and users will play in VR multiplayer.

[sinful tree]

Like, your app on your device is a client, the server is something the client would connect to.

[wheat magnet]

not dedicated. But listen server maybe?

Like we create sessions in unreal engine

for multiplayer.

[sinful tree]

Technically it's possible.

[wheat magnet]

My question is that, is multiplayer supported for android devices?. Like for PC

Technically or exactly?

[sinful tree]

If you can run the game on android, you should be able to run it as a listen server. As to how well that will work though...

[wheat magnet]

how it will work over internet?

Like dedicated server. Not local/LAN server

is there any proper documentation/article for android multiplayer?

[sinful tree]

I think you may be mixing up terms....
Dedicated Server: A dedicated piece of software running exclusively to host the game. It runs headless, no 3D rendering is done.
Listen Server: The game client acts as a host of a game while also playing it.

So, these being defined.... If you were to run a dedicated server, you'd likely have it set up on a PC somewhere. You could still have it host a session and allow players to connect to it.
If you were to use Listen Server on an Oculus Quest 2, that means the Quest is having to also act as the server, which means more processing power is taken up trying to host the game, and typically for VR apps, you want them running at the absolute best they can so you can hit the framerate targets so you're not making your players feel sick. Further insult to injury is that additional network data is having to be routed through the host Quest over wifi. So it is technically possible, but probably not the best idea.

[wheat magnet]

So what is best idea?

I know the QUALCOMM chipsets is not equivalent to intel architecture CPU's

[rose egret]

what happens if I spawn a replicated actor and call a multicast right away, (actor is net relevant)
will client receive that Muticast ?

will the multicast be ignored ?

[sinful tree]

It's not so much about what is best. It's about what you're trying to accomplish.
If you want players to be able to host their own online multiplayer instances and don't want them to have to rely on external hardware or setting up their own severs, and you don't want to host servers for them (ie. They only need their Oculus Quest to player your game online) then having them being able to host their own sessions on their quest is really your only option.

If you want to allow players to host their own servers, that means you're releasing a server executable to the wild, allowing players to host their own games on whatever hardware they want.

If you want to host servers yourself, that's possible too, but then you have to build your own backend to support your playerbase - eg. Player wants to connect, a server instance is started for them, they join, a session is started for others to join etc....

[wheat magnet]

If I package dedicated server for windows platform ( like people do mostly in these days ), And package game for quest 2(.apk), Will I able to connect to that dedicated server ( open 127.0.0.1 ) in android?

[sinful tree]

Yes

[wheat magnet]

But server is running on windows platform. How does it will work with android?. Like If I sent server RPC from android, does it gets called on windows server?

[sinful tree]

Network connections don't usually care about the device connecting. What you've just asked is like asking how does an Android load a webpage when the windows server sends them the web page.
Data is data.

Your server and your client are set up with those RPCs - the RPCs are the instructions for communicating between two endpoints, regardless of what they may be running on. One could even make their own client made in a completely different language, running on an Arduino to connect to an Unreal Engine server, and so long as it communicates the right data back and forth & calls the correct RPCs, the unreal server could care less that it isn't actually an unreal client, or that it isn't running on one of their supported platforms.

This is also why it's actually very difficult to validate a client over the internet. You can't trust client machines as someone with know-how can make it so it always responds back with whatever data they want.

[wheat magnet]

This means multiplayer in unreal engine is not platform specific.

So it's like cross platform. I will test sessions/steam/EOS things in quest 2. I hope these plugins/subsystems works well with android.

[half cradle]

so i just packaged a third person template with dedicated server and im getting slightly shitty performance at 2 clients and absolutely dogshit at 3
about 30-60ms lag to replicate movement on the other client with 2 and >500ms with 3

am i missing something fundemental here or is this just a hardware issue?

the PC is not exactly sweating it

[rose egret]

how to make a Server_XXX() virtual so that I can override it in subclass ?

[quasi tide]

You override the _Implementation method

[sinful tree]

From what I understand, if you're using Seamless travel on a server, a player controller would persist through the transition, but if you're just server travelling without seamless, then new player controllers would be created as each client is effectively reconnecting to the server. Client Travel (ie. Moving from server to server) would also be a hard travel, so player controller wouldn't persist.

[weak linden]

What're your hardware specs?

[sinful tree]

If you're using seamless travel, then PlayerState is the place.
https://docs.unrealengine.com/4.27/en-US/InteractiveExperiences/Networking/Travelling/

[weak linden]

The clients' local GameInstance is a great place to store stuff like that, player name shouldn't need to be stored in that manner though (Since you can use SetPlayerName and it "should" be copied to any new player states when switching levels)

[fathom aspen]

But why that outdated doc when we have this: https://wizardcell.com/unreal/persistent-data/

Read the link I sent and you have all the info you asked for + you can start preaching about this stuff

[prisma snow]

have you profiled?

[half cradle]

a 2070 super, ryzen ... 5090 i think? either way, shouldnt have any issue running 3 third person templates

[half cradle]

its a third person template, so... no, profiling it did not cross my mind

[timid moat]

@thin stratus About your last paragraphs in your "UE4 Multiplayer Sessions in C++" tutorial, I have found this answer useful: https://forums.unrealengine.com/t/how-to-use-c-session-search-results-with-blueprints/352007/5?u=viacognita

[half cradle]

hmm, anyone got any idea why this happens? im seeing all tutorials on this pixel streaming plugin to just run 2 clients and it should work, but im getting this... im running a TURN server and a STUN server (default from https://github.com/EpicGames/PixelStreamingInfrastructure/tree/master/SignallingWebServer/platform_scripts/cmd)

specifically the Start_WithTURN_SignallingServer.ps1

[blazing spruce]

Hi, I'm having an issue getting my security camera system working on the client properly, I've got a Control Panel BP which does this, works fine for the server but when the client interacts with it, it sets the clients view to the camera but doesn't disable their input and enable the input on the control panel instead so they cant cycle through the cameras nor can they exit them, any ideas why?

Interaction

[fervent jay]

EOS, works fine with Android.. using it as we speak.

early on with EOS it was a bit of a task, but its alot easier today..

[hushed rain]

Having problems replicating the result of a random line trace location so I can spawn fire at the location for a molotov. Any ideas why the server/client line traces don't line up?

The random line trace runs on a timeline to perform multiple line traces with a random end result within a box, should output the hit location to the multicast, no?

[sinful tree]

Your "Fire Spawner" actor should likely be a replicated actor. On begin play you then wouldn't need to multicast the sound, you just have the sound play.
After playing the sound, you should use a Has Authority node and use the "Authority" path to have the server run the next bit of code (your line traces) - there should be no need for the "Run On Server" event.
Rather than multicasting to everyone to spawn BP_Fire, have that too as a replicated actor and don't multicast - just let the server spawn it, that way you allow your server to be in control of that actor on all clients.

[gusty turtle]

i think my possess node is not working beacuse it has to be run server side

i would like to be able to call it from the playercontroller tho

where should i run the possess node?

in the level blueprint?

but i do not understand how to call events within the level blueprint from another blueprint

[blazing spruce]

I dont think you should use the level BP, ive got my 'spawn players' event on my game mode since the game mode class is only on server

[valid imp]

Anyone knows the max Array size (for say bytes) that can be replicated? Assuming whole array has to be sent ofc.

[sinful tree]

You can call the possess node basically anywhere, you just need to ensure you're running on the server when you do it.

[tall bobcat]

looking for blueprint coder to code/or implement GUI, Playercontroller .no, quest system, ability systen, inventory system

[quasi tide]

Please don't spam. As I have already told you in #ue5-general

[tall bobcat]

You just wrote instructions

[sinful tree]

Wrong channel. Check #instructions. And yeah no cross posting read #rules

[quasi tide]

Yeah, it's a link that takes you to the channel that you need to read in order to find help for your project.

[kindred widget]

And even if you could ask for hired or volunteer help in channels, GUI stuff has nothing to do with Multiplayer. 😄

[sinful tree]

65535 bytes is max size of an array and I think the max size that can be replicated (according to some testing Authaer did last year at some point).

Looks like the array would be truncated to fit as well, so it would still attempt to send but it'd have missing entries so it's under the size limit.

[valid imp]

That sounds like enormous size to be replicated in one go, unless UE does some magic and chunk it into multiple RPCs.

[pallid mesa]

its really 64k, and no, unreal doesn't chunk it for you

you have to chunk it yourself 😄

ooor... err... increase the maxbunchsize (do not do it unless you know what you are doing 🙈 )

[fathom aspen]

I know what I'm doing, I wanna tear unreal apart

[sinful tree]

https://tenor.com/view/train-funny-innuendo-crack-train-tunnel-gif-13545983

Sending huge arrays be like:

[hushed rain]

Okay, I got it working this way instead(thanks, better optimization), but the line trace still shows completely different results on client/server.

[sinful tree]

If you followed my way, there shouldn't be any line trace data on the client.
Server Spawns "Fire Spawner" > Server's Copy of "Fire Spawner" does the line trace and spawns the "Fire" actor where it hit. Client doesn't do anything in this situation other than receive the replicated Actors and play the sound effect on begin play.

[hushed rain]

Hmmm it is showing line traces on client tho wtf..

[sinful tree]

Post your updated code.

[hushed rain]

the fire actor is just a timeline damager with particle

[sinful tree]

How long is your timeline?

[hushed rain]

like 30 seconds i think

[sinful tree]

And the New Track 0 is firing periodically?

[hushed rain]

20 seconds with an event track

firing every .5 seconds or so

maybe everyh second

yea every .5

[sinful tree]

Also, are you actually spawning the Fire Spawner on the server?

[hushed rain]

yea when the molotov hits the ground it does a multicast to spawn it

[sinful tree]

"Executes on All" is not spawning on the server. That spawns a copy on all clients.

[hushed rain]

ohhhh duh

so thats why it was running on all then

[sinful tree]

Yep. The other thing is, I'm not sure if that fire damage actor is completely necessary and it's a bit wasteful spawning actors every .5 seconds that are I'm guessing pretty much deactivated as soon as they've spawned?

[hushed rain]

nice! i think it works perfectly now

yea im probably going to tweak it to be way less actors but bigger actors

is timeline the worst way to do fire?

also im kinda going for a procedural/random sort of molotov

[sinful tree]

Not the best per se.... If you wanted to deal damage over time, a timer is usually sufficient, but it depends on if the track you're using is firing at a static rate or not, which going by what you just said, you may have some random points set where it triggers, but even that could likely be handled better by a timer that you retrigger with new random values rather than relying on a static timeline graph.

Example:

Either way, timeline/timer works fine for such a situation.

[hushed rain]

Interesting, thanks for the insight. I've always just used timelines because it was more familiar. Might have to try a timer.

But yea, i've heard timelines are just slightly more performant ticks lol.

[quasi tide]

That makes no sense. Timelines use tick as well.

What someone might think is timelines are more "performant" because they are more akin to on-demand ticks.

[hushed rain]

Ahh maybe that was it.

So timer is the most performant way to do repeating time-based events?

[graceful flame]

This way or that way doesn't really matter so much when they both end up requiring stuff to change every frame.

[hushed rain]

Interesting, thanks for the info. 😄

[prisma pelican]

would hosting game session in game instance instead of game mode cause any issues?

[plucky prawn]

Don't timers run on tick though?

[frosty dune]

Hey guys, newby to UE here. What would be the best way to go about storing player data for multiple players on a dedicated server (Money, item amounts, etc)? Would it be something like sqlite or can I get away with something already in the blueprint'ing system?

Gotcha. Thanks! 🙂

[graceful flame]

Just know that save games are files stored locally and therefore not secure. If you're storing something sensitive like gold amount you can't trust the client save game because they can easily change the values. So instead you probably want to use a secure cloud database and REST API for data storage and reading.

[frosty dune]

That's a hot tip. Yeah I can't store that information locally. I'll probably just go the REST API route then

[graceful flame]

Feel free to use save game for client settings though like video and audio, mouse, keyboard bindings ... etc

[frosty dune]

Yeah that makes sense. I'm familiar with Postgres/MySQL so I can just implement one of those probably

[sinful tree]

If your intention is to allow other players to host servers, then you cannot use an external database reliably. If you are hosting your own servers (ie. no one else has server executables, no one can host as a listen server) then you can use external databases.

[distant vault]

Hello, im testing out server travel in standalone with 2 players and I get these errors some times and for some reason my other player cant find the hosts match. anybody know what this means.

[weak linden]

Just an FYI, you can most definitely use SaveObjects server side, as long as all your data, such as currency, items, etc, is managed/updated and validated via the server itself, then there's no need to worry.

Of course, if the data needs to be shared/accessible to other servers, then there will definitely be a need for a custom back-end solution, REST API, SQL, etc, but those will still need the server to be in charge of managing, to prevent any "funny business".

[weak linden]

When you say your other clients can't find the host, I presume you mean not at all? What settings have you got in your DefaultEngine.ini for Steam OSS and what settings are you creating your sessions with?

[dark edge]

If it's fire that does a damage tick every half second or whatever, use a timer.

If it's meant to be continuous or on the order of many a second, use tick/timeline

[distant vault]

Yea not at all, I’m using the advance session plug-in

[uneven kraken]

Is there a way to set NetUpdateFrequency at the field-level, or the component-level, rather than an entire Actor?

[hollow eagle]

no

[dry pebble]

What would be the best way to dynamically change bUseControllerRotationYaw only when a client is moving/pressing input and then also have that replicated to other clients? This is so you only rotate towards camera's direction when moving. I have it so only when input is pressed bUseControllerRotationYaw = true and when it's (0,0) bUseControllerRotationYaw = false. But other clients can't see them rotating.

[grave fog]

how to get clients player controller ?

[winged badger]

from where?

[weak linden]

This is C++ but can easily also be achieved in BP if you need it (use VectorLength in BP instead of Size), I run this on Tick, so it updates on all clients

// In Tick
bUseControllerRotationYaw = IsMoving();

// Function header.
UFUNCTION(BlueprintCallable)
bool IsMoving(float Threshold = 0.0f);

// Function CPP
bool AMyCharacter::IsMoving(float Threshold)
{
    return GetVelocity().Size() > Threshold;
}

The optional threshold is in cm/s

[grave fog]

how to get clients player controller on server ?

[winged badger]

again, context

[weak linden]

From where? As in, in what class?

[winged badger]

you can have 10 clients and want one specific controller

[grave fog]

player controller

on servers PC

[weak linden]

The PC is the controller, it doesn't matter if you're on server or not, or are you trying to get *another* players' controller?

[grave fog]

if I run event as run on server veriables I use on that event are server veriables or client variables ?

[weak linden]

If you run a "Run on Server" event from the clients own controller, it will run on the server within that controller, so any variables are local values to the servers

[winged badger]

anything coming out of ServerRPC is evaluated on server

[dry pebble]

I code in C++ so that is perfect. Should I run this with an authority check for server on tick?

[weak linden]

Convenient, and no, I just run it everywhere 🙂

[dry pebble]

Ohhh I understand because velocity is already replicated, so the local client and proxies just set the bool based on the replicated velocity.

[weak linden]

Correct

[dry pebble]

Ahh thank you so much! I thought I was going to have to make a custom struct for the character movement component FSavedMoves or something. You really simplified that

[weak linden]

You're welcome! Fortunately, no need to play around with the CMC

[dry pebble]

Hehe not yet anyway... Until I add climbing and sliding lol xD

[weak linden]

Oh boy, good luck! That reminds me I need to check into ladders at some point 😬

[dry pebble]

You got this! :D

[rough dock]

hey im kinda having a problem with this. i have a string that gets shuffled so the messages are random each time you load into the lobby but the client and the servers string is different

im not really good with replication so i fell like im doing something wrong

it works when the host of the custom game hits start then it searches for the actor that i want then it replicates to all since its coming from server

then the bp casts to widget so it can start the scrolling text

also when it makes the full message it replicates to all the message

[rough dock]

also i just tried replicating all the variables that didnt work

[weak linden]

The first issue I see is that you have a replicated variable in your Game Instance, which itself is not replicated, the server and client/s have separate local instances, secondly, am I right in assuming this code is in a widget? If that's also the case, widgets also only exist on the client, so you will probably need to route this via an RPC in the widgets owning controller instead 😅

Unfortunately I'm just heading off for the night, so I can't give you much more help than that right now, but if you don't have it solved in about 8-10 hours from now, feel free to give me a message 👌

[rough dock]

yeah but its using a widget component on an actor with replicates enabled so i thought that wouldve been good

and rpc is repnotify right

[weak linden]

No, widgets don't exist on the server at all, and no, an RPC is a custom Event marked as Run on Server/Owning client/Multicast

[rough dock]

okay ill try again

[fathom aspen]

They do for a listen-server player 🙃

[weak linden]

If you're the host, then yes 😅

But technicalities 🤫

[fathom aspen]

I would add to the notes that you should read the following: #multiplayer message @rough dock

Messing around with replication when you have little to no experience with it is like playing with fire

So better take the time to learn it

[rough dock]

thanks ill watch it

[fathom aspen]

It's watch + read 😄

[valid imp]

Why would I bother, if UE can send it in one go :P?

[fathom aspen]

vori meant you do if it's bigger than the max-size

[ancient adder]

I have a run on owning client function in my component but it executes before the component is created on client side, is there a way to make it delay the execution untill the client is ready or something like that? without adding extra functions

[fathom aspen]

I know at least two, but they involve adding extra code, like any other way that would exist out there

[pallid mesa]

that's the thing, you cant if it exceeds maxbunchsize XD

[violet birch]

Hey! Has anyone tried making server to server communication working for UE5?

Client to server and server to client is solved, but a better server to server would be nice.

[pallid mesa]

With a middle-backend? Sure!

[violet birch]

ah middle-backend? like Server1 <-> middle-backend <-> Server2?

Would that mean a lot of translation of rpc's and so on? Also wouldn't there be a quite hefty delay?

[pallid mesa]

yes

but for notifcations and such it's not a problem

unless you want to build something more complex

[violet birch]

Fair enough 🙂 I guess it depends on complexity.
The question is mostly out of discussion and curiosity, but lets say a MMORPG.
That's quite complex and I def. see some problems with delay. The middle-backend (MB) I guess should still exist to hold track of universe-state and server scaling.

I was thinking about this and it would be nice if the UE servers could communicate some information without MB or at least in parallel. Lets say physics and collision would be handled by UE server and client. Position and critical events would go through MB.
The scaling thing also needs to be a combo of server<->server and MB for when you cross server borders. There should be a proxy player actor replicated over to all the servers that can see the player but not authorized over it.
So far I've only found solutions that would alter engine source. Which of course is fine if you want to maintain that code 🤷‍♂️

[pallid mesa]

for that... you'd be better off building your own networking model from scratch, main advice is to explore how wow does it

[bitter oriole]

This is outside the scope of Unreal's multiplayer. You wouldn't use any of Unreal's facilities for that

And physics/collision is what drives position, so one of those servers in your achitecture needs the ownership on it (the one the client is connected to)

[violet birch]

yeah I guess. do you know if Iris will add anything of it?

[pallid mesa]

no, I'm afraid not

Iris is a complete rewrite of unreal's networking model but the principles will still be preserved (listen/dedicated)

server to server is beyond the scope, but... not sure if we ever will see official support or something in the future

[violet birch]

I understand why, but sad 🙁
But there is of course pros of writing your own layer. Control and all that.
If I want to do that do I need to replace UE network layer?

[kindred widget]

I think that depends on requirements. You can easily use Unreal's networking for localized stuff and have a backend handle server to server stuff. For example, if you had two parts of a world. One server could run one, the other server could run the other. You would be able to use Unreal's normal networking in each based on some set state from the backend. Your servers could be modified to send and receive data from and to your backend, and your Unreal Network just becomes the local manager basically. Same idea for instances of a same level like common MMO dungeon running, etc.

[bitter oriole]

You'd forget entirely about Unreal's network layer, and build your own from scratch

[prisma snow]

sounds like fun

[bitter oriole]

Honestly, really depends on the game. Are you doing a trading cards game with turn-based gameplay with a central server defining card ownership? Then it's not that much work to simply do everything yourself

[violet birch]

In this scope, is overlapping worlds excluded? How would it work with really large worlds were servers host overlapping parts of the world?

[violet birch]

fun, complex and time consuming 😛 depending on scope ofc

yeah the scope really does effect the complexity of the answer 🤔 This is a little bit over my head, but I'm thinking quite complex. You know dynamic server borders, 10th of thousands players and scalable servers with shared map area and so on. A middle-backend holding the "universe" and controlling what happens and so on

[bitter oriole]

This is particularly difficult in Unreal because you'll need to hard travel to a different server with a blocking screen. If you're using Unreal's networking, you want to stick to the underlying assumption that one server = one unique map, and changing server = one big loading screen

[prisma snow]

Well definitely, but in that case I'd jist go with http or websockets and call it a day

[bitter oriole]

And IMHO that would be the technically correct choice by some margin

[prisma snow]

Idk, it would certainly be relatively easy and straightforward

[prisma snow]

Well that sounds complex :D
I mean, IF you know what you need and Unreal cannot do it... Certainly I'd think it a lot before doing my own net module from scratch

[bitter oriole]

Unreal's net model is a consequence of Unreal Tournament, Gears, Paragon and Fortnite - games where people join a server to play a 20 minutes game and then leave or maybe stay connected while the server travels to a different map. If you break out of that mold, you have to accept that there are consequences

It's made for multiplayer shooters, plain and simple

It's quite good at that, too

If what you're doing is Magic Arena, Destiny or Diplomacy, well, it's not really what it's made for

[prisma snow]

Yeah, and it's quite flexible anyway, if you don't break the mold too much

[violet birch]

Yeah it's not a small challenge xD Yeah I've understood UE isn't made for it. I really just wanted some more thoughts and discussion around it.
I have investigated using Online Beacons as a actor on the server to communicate with other servers. But it's not really trivial.

A nice compromise would be to have a lot of servers hosting separate parts of the world, some hosting the same, and when you walk over a border you net travel. Then a common backend service would keep track of states so that the different instances can match.
We use a grpc library today to sync stuff between the servers and backend.

Coming from the Automotive industry, I'm fascinated that game industry still are so secretive about their implementations. Especially common stuff. Though some stuff might be harder to generalize in games 🤷‍♂️

At least we do have pretty awesome game engines now a days 🥳

[bitter oriole]

The game industry isn't particularly secretive really when it comes to that

The folks at Bungie have detailed their infrastructure, for example

(microservices, essentially)

The main thing here is that what you're asking about isn't common (most games don't have player state handovers between servers, very, very few do) and it's typically the sort of stuff teams of 100 engineers talk about

[violet birch]

Okay your right. That is actually a good point.

[bitter oriole]

Most of the gamedev experience is more like "we have to write the entire game code in less than a year so what can we reuse from our previous game and still make appear different"

Few people actually get to invent entire network architectures

[kindred widget]

Game industry isn't really secretive about anything except for cheat prevention stuff. There just also isn't a good source of common data and every studio has their preferred ways. You have to pick around for information a lot.

[violet birch]

I mean I still find it much harder to find implementations in detail. Sure there are a lot of broad picture videos and so on. A lot of forums are bad (especially UE for some reason)

So maybe secretive is the wrong word. It's how the information is distributed I think. Or maybe it's even a personal preference thing.

But this kind of network implementation isn't that common I guess.

I could give more examples, but it feels out of scope of this channel 🙂 I appreciate your thought though, they make sense. I might need to revaluate my view on the industry

[bitter oriole]

I mean, the stuff we're talking about here is usually decades in the making, less by choice and more as a consequence of which game you made before.

Epic has a specific multiplayer model for Unreal because it's what they've needed so far

That Unreal doesn't do sharded MMO multiplayer servers is, well, a consequence of never working on a MMO

[violet birch]

Is there a engine out there that focuses on MMO?

[bitter oriole]

How many MMOs do you think get released these days?

[dark edge]

Sure, probably on the order of one per MMO

[bitter oriole]

More to the point, who has the marketing budget to pay for enough players to have something you could call an MMO

And tech wise, when Fortnite and Destiny have the player counts they have for the time they've had them, why would you want to build a traditional MMO

Anyway, say you still want to build a traditional MMO with Unreal, and you don't want instancing but a completely open world map with all players on it - you'll throw out the networking model, and build something yourself

If you do that, well, you're going to have to reinvent rollback multiplayer, things like that - this is extensively documented

It's just that no one writes tutorials for making an MMO because making an MMO is 1000 developer-years of work

[violet birch]

A company could have the budget? Like the company I'm working at. We are doing a MMO in UE5.
Luckily for the company, I'm not the one working on the multiplayer part 😆 I'm just curious.

What is a "traditional MMO"? 🤔 I don't know if that's what we are doing.

I know that we are altering the engine, not sure in what extent. (well, I know some because I was in that team, but not anymore. We have solved server to server, but I don't know if it's good/stable enough)
I don't really agree on that there are extensively documented, but I absolutely understand why there are no tutorials.

Maybe the documentation would seem extensive for someone more experienced than me. MMO-networking is not the easiest area in game dev I'm guessing.

[bitter oriole]

A company could have the budget? Like the company I'm working at. We are doing a MMO in UE5.
If you have the budget to reach millions of players, that's great news! I'm not sure many companies today outside of blizz, amazon and a few others can do that.
What is a "traditional MMO"? 🤔 I don't know if that's what we are doing.
Fully open world map with as may players in one spot as you can find willing to be there - as opposed to Destiny's instanced levels where you have hard caps on player count.
I don't really agree on that there are extensively documented
There's entire tutorials on rollback multiplayer in Unreal specifically, for example

[violet birch]

That's my general perception of game industry.

But I think we should focus on how much better it has become over the years ^^ I have a tendency to forget that

I haven't used UDN that much, but it's not that good. I don't know anyone that uses it to be honest.

[bitter oriole]

Literally the first time I've heard anyone say UDN wasn't that good

[prisma snow]

UDN?

[bitter oriole]

Private Unreal forum where Epic engineers can provide direct support

$$

[prisma snow]

Ohh I see

$$

[violet birch]

Not millions, but we already have a player base. We'll def. not blizz or amazon 😅 but we're alright.

Okay then we are doing a traditional MMO. Wish us good luck 😄

I haven't seen that tutorial. I'm glad you're challenging me, because it def. don't help me being negative. Ty!

[prisma snow]

$$ open lots of doors, although I am always surprised at how far you can go for free in this industry

[bitter oriole]

IMHO the single biggest barrier to a MMO experience is the players, you need to keep them engaged for years with relative stability at fairly high counts for most of what constitues an MMO experience (competing between teams for raids, etc)

[violet birch]

Weird, I've never heard anyone say it's good. I've only been at two studios that had access though.

Maybe I should spend some more time there

[violet birch]

Yeah totally agree with you there. Luckily my company has years of experience in the MMO space. I just like to discuss it with others as well 🙂

[bitter oriole]

I think MMO tech is kinda overrated - sure, it's a bunch of very hard infrastructure problems, but the content pipeline and community is probably a bigger one

At least today we have a lot of nice tools

[violet birch]

haha yeah I hope they do xD
But I think it's the implementation of the forum and not the expertise of the people hanging there that is the issue. Anyways I'm gonna come clean and say I think I might need to give it a new chance 😄

[bitter oriole]

Really you probably don't want C++ for much of your game servers when 🦀 is right there

But like, probably not C++, whatever your pick.

There's a bunch of dedicated server-side languages for safety and uptime too

[prisma snow]

So an MMO would basically rely on a custom server(s) that handle all game logic, and then the client is only for input/output, rendering stuff, and asethetics?

[bitter oriole]

Yeah

That's kinda how they work historically

Fairly dumb clients compared to shooters where the client and server work more symmetrically

[prisma snow]

Writing such a server system sounds indeed extremely complex. Mainly due to the real-time stuff, plus of course the complexities of such big spaces with so many players

[prisma snow]

Even shooters seem relatively "dumb" clients to me, besides prediction stuff

[bitter oriole]

Shooters run most of the game locally, really

That's what prediction involves

[prisma snow]

Well that's true, at least movement/combat which is the meat of it usually

[bitter oriole]

You run the entire game on each machine, and then when the server tells you the ground truth that it decided on, five frames later, you have to rollback to that state and replay your latest changes on top

It doesn't get much smarter than that, client side

Shooter clients are trusted to a much higher extent than any other genre

The classic "shooter is right" line of decision where servers prioritize shooters vs their targets is something no MMO is going to do

[plucky prawn]

not really. depending on the engine and stuff usually you let the client tell you what they saw/did then you verify it. i think it was like idtech that would basically rewind some server state and confirm that a shot for example was actually possible

[bitter oriole]

I'm not saying the server trusts the client blindly

I'm talking about how servers reconcile two clients who say "I'm A, I shot B" and "I'm B, I moved out of sight from A"

You have to pick one version of the truth because they're both right from their perspective due to lag

Usually, you pick A, with some checks like you said

You could do everything server side without any complex logic and just go "too bad A, B had moved away, even though your screen showed B's head in your crosshair when you fired"

That would be way easier

But "missing" a shot that you correctly took on your machine sucks immensely, so most shooter developers go through absurd lengths to prioritize that, even when it means the other, equally correct player will be noticeably shot through a wall

AFAIK most MMOs will run everything on the server without much prediction, and then download the feedback to the client

I suspect spellcasting progress bars exist mainly because of that, yeah

[prisma snow]

Also sound cues and animations can hide latency very well

RTS usually have some input delay by default (lockstep) and some hide it really well, SC2 cames to mind (although Starcraft is extremely responsive)

[bitter oriole]

Even a casting delay of 0.2s (after the player has committed to the action) is a godsend because most of the time that will be enough to tell every client what's gonna happen and when exactly

The "shot through wall" thing then doesn't happen because you get nuked by that fireball at a time more consistent with your location

Yeah also that

TLDR, shooters are absurdly hard multiplayer wise

MMOs have different difficulties

Much simpler clients, less interactive real-time stuff, at the cost of needing to run 150k players on your tick

Server go not brrt

[worthy knot]

im running a print string of this on event tick, it only displays changes on the server, i made it return a vector variable which is set to replicated and still displays only on server. on the other hand i had to make a server and multicast call on event tick then the variable displays changes on server and client, why is it like this

i dont want a whole server and multicast event running on event tick

[bitter oriole]

Why not use a simple replicated variable?

[timid moat]

This tutorial https://cedric-neukirchen.net/2021/06/27/ue4-multiplayer-sessions-in-c/ is really difficult to make it work with Blueprint. I think it is better to create another class to make the calls to the methods on GameInstance, instead of trying to modify the code: I'm blocked trying to create my own UENUM to use EOnJoinSessionCompleteResult with blueprints.

[worthy knot]

you mean this?

[plucky prawn]

as i said, if you really need access to this specific enum in bp, you are out of luck. your best bet would be to make your own enum to mirror the values there, then you will have to convert/map to and from each enum. its not a nice solution but its pretty much the best solution short of editing the engine code and running a custom source build

ye but dont though

[timid moat]

If you are talking about my question, that is what I'm going to do: not use blueprint because it is a mess. The only reason to use blueprint is let the user to join a session clicking a button in a blueprint widget.

[worthy knot]

@bitter oriole it still sends only on server

[timid moat]

I don't know a lot about sessions, but if there more than one session in the server, how can I choose the one to join? Or probably there is only one every time in the server.

In Shooter Game project sample from Unreal 4.27 the use Slate for the UI, so they don't have any problem because they do everything from C++.

[normal fox]

how do you replicate a variable from client to server in umg bp?

so that all players see the change

[bitter oriole]

Same as in C++, using a server event.

[normal fox]

yea, problem is- it's not replicating the variable.

the change does not happen server side.

[bitter oriole]

What's the class used here?

[normal fox]

the user widget?

where would i need to replicate this?

[bitter oriole]

A widget should not be replicated, so it won't be able to send RPCs.

[normal fox]

i see.

[bitter oriole]

Normally only your player controller or possessed pawn is able to send server events

[normal fox]

so i need to cast to the pc?
how would the other clients/server be able to then see the update in their widget?

[bitter oriole]

You need to get a pointer to the PC, then have that PC send a reliable server event to the server, which will be able to alter game state on the server

Provided that state is replicated, the value will be updated to other clients down the road

Their widgets should either use a replication event or self-update on tick

[normal fox]

thanks for the help.
imma see what wonky thing i can make work 👌

[trim plume]

Hi. We are making a racing game were the vehicles will reach 1000 kmh, everything seems smooth until we reach around 500 kmh.
We tried lots of things, and the best result is when we're using the SmoothSync plugin, which made us reach 500 kmh, any greater than that and the vehicle jitter.
The player owned vehicle is buttery smooth all the time, it's the other players that jitter when at high speed.
It should be possible since Redout2 is made with unreal, and they can drive like 1400kmh.
We've spent a week now trying to solve this issue.
Anything that can help us is greatly appreciated. Thank you in advance.

[normal fox]

my wonky solution as a beginner would be to adjust the scale.
if everything is smaller, you would need less speed to travel at apparent faster speeds.
not sure how well this would work.

[violet birch]

Try to add a real time economy, tied to actions like shooting, on top of that one 😅

[prisma snow]

do you mean an artificial client-side delay? Yeah I have that in mind for RTs combat/spells when we need them, bcs there are certain situations that we could leverage in that way

[bitter oriole]

Adding an economy is also way, way, way harder in non-technical ways than it is technically

[violet birch]

Very true. I'm glad that's not on my table either.
I ofc need to understand how to tie it together with the gameplay

[bitter oriole]

Like, Amazon literally had to rollback the entire game a few times last year because they messed it up

[prisma snow]

lol which game btw

[bitter oriole]

New World

[violet birch]

Made in lumberyard. I wonder if they released their network solution somewhere now that Lumberyard is open source. 🤔

[trim plume]

We have thought about that too, but we rather not want to go that route though. 🙈

[bitter oriole]

It likely wouldn't be particularly valuable in itself

[violet birch]

Maybe not, but maybe some ideas and solutions that could be valuable to look at.

Edit: Seems like O3DE is not really Lumberyard. Just the base and then stuff is replaced

[normal fox]

yea, i can imagine it would be a real pain to go through with.

[tranquil yoke]

I have a case, where i replicate actor from Server1 to Server2 via Beacons, i do it by adding it to customNetDriver of HostBeacon Server1 , and then on the reciving end it gets added to GameNetDriver of the server2, Now issue is on Server1 it has NetRole == Authority, but when server2 recieves it NetRole becomes simulated.

What i want is i want to change the NetRole on Server2 to Authority also, so my game logic on Server2 should stay the same.

anyone know how to manually change roles ?

[violet birch]

I know we had this same issue. Not hundred percent sure here, but I think having two Auth roles over same replicated actor will create problems for you. Even maybe a round robin? 🤔

I think we went around this by adding a third role, SimulatedAuth. This created a load of engine source changes though. Think we abended that idea in favour of something else.

[tranquil yoke]

What is that something else ?

[violet birch]

(Direct download to a pdf!)
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwjdxZjZgNb7AhVDSPEDHT4TAh0QFnoECAoQAQ&url=https%3A%2F%2Fcedric-neukirchen.net%2FDownloads%2FCompendium%2FUE4_Network_Compendium_by_Cedric_eXi_Neukirchen.pdf&usg=AOvVaw1MXKQQnvbVzpkKgqtNQ1mU

This compendium helped us a lot.

[violet birch]

I don't really remember sorry. But I think we made our own connection setup mimicking a client connection and ditched the Online Beacons

[tranquil yoke]

I think having NetRole - simulated on BeaconNet Driver is fine, but when it gets added to GameNetDriver it should be authority again

[glad escarp]

Hey folks. I currently have a simple host game menu which has an editable text box that saves whatever is entered into the field on commit, as a string variable on my game instance. This variable is used as the session name when creating an online session. I wanted to store it on the game instance so that it would be persistent and I could use it later when destroying the session. Is this flow correct or is there something else I should be doing for best practices?

[violet birch]

You might be right. I just double checked and we did not ditch Online Beacons.

I know this was a aha-moment for us
https://ikrima.dev/ue4guide/networking/connection-flow/

And I think we override NotifyControlMessage method in Beacon and setup our own connection flow. Hope that helps.

[fossil merlin]

Anyone have issues moving to 5.1 with code containing Switch has Authority nodes? None of my code seems to fire correctly now with those nodes in place from 5.0 to 5.1 running as a client.

[gusty turtle]

Im trying to have a component of a blueprint move after user input through blueprints, the blueprints moving the component are run on the server and the movement does not replicate on the client. I got it working by multicasting the event that moves the component but is that the correct way to do it, or should I only call it on the server and replicate the movemnet of the component?

since now the objects arent really synced, and I think if player spawns later on all components will be in their original state for them

[rocky kestrel]

Does anyone have idea why me or my friend can't connect dedicated server? Without "[OnlineSubsystemSteam]
bEnabled=true" it works you can host server and you can join with ip. But when I enable Steam no-one cant join server. It's shipping packaged server and game. Both ways launched from steam.

is it just dedicated servers and SteamSubsystem doesn't work together. Then I have to make login functionality and databases. Steam just could be easy that I can use steamID64 and no login expect steam needed.

these are in my config

[thin stratus]

If you want Steam, the Server also needs to use Steam

That's as simple as it gets

If the Server is using NULL, then you won't be to connect to it

It will deny you due to mismatching UniqueNetIds

[rocky kestrel]

How to make that server is using also steam? Also can server and game run both same computer? When game is published someday some people would want to host own community server and same time play it.

[thin stratus]

You need to copy the .dll files of Steam into the Binaries folder of your Server

Otherwise it will try to connect via a SteamAccount

Which it shouldn't of course

[violet birch]

The reason why I would override NotifyControlMessage is to be able to distinguish a connection between C2S and S2S. The reason why we altered engine source was to add a new NetRoles to give the "client" that connects in a S2S connections will have a hybrid role between simulated and authority. We called it SimAuth.

If you know how to avoid adding that role that would be nice.

[rocky kestrel]

I'm so new at this xD But where to find those .dll files? And put them there?

[thin stratus]

They should be in that folder or not?

Like

.dll files

I don't remember how that exactly works

Been ages

[rocky kestrel]

There is only steam_api64.dll

in that Steamv153 folder

[thin stratus]

Can you check the ThirdParty folder of your engine

There should also be steam i nthere somewhere

There should be more than 1 .dll iirc

And you need to then copy them to your packaged server's Binaries folder, where the exe is

[rocky kestrel]

There is also only that api.dll Could it be because im using that new ue5.1 source engine?

[thin stratus]

Well, then just try that one dll

Again, been a good chunk of time since I had to do that

[rocky kestrel]

haha np. Thank you for help I try that!

[tranquil yoke]

@violet birch thanks

u changed NotifyControlMessage, which means u added a new NetConnection via the beacons , which means it should have added playercontroller, playerstate and gamestate . am i right ?

I tried adding the netConnection, but NetRole was creating issue so i just moved to adding actors and pawns directly most of the replication which is required for simulation is inside the pawn itself.

[cerulean seal]

For multiplayer with the gameplay ability system, Does anyone know if you have to register for attribute change callbacks on the server?

I'm trying to sign up for an attribute change on my client to update my health bar, but for some reason, the callback only fires if I register on the server. Then I have to setup a multicast event to get it to spread to the clients. I have verified that the attribute is replicating to the clients, so I'm confused why I cant register for the callback on my clients.

https://gist.github.com/imstylen/c62ac651cafe3e9c08dd4cb0a6aec253

[violet birch]

This is a bit outside my understanding of it. But we created a new class derived from OnlineBeaconClient and override NotifyControlMessage from there. Which means, I think, it still using the beacon impl of NetConnection.
I don't think it's any different from creating a regular beacon connection except that we are following a different Connection flow scheme.

This is as far as my knowledge goes. We did a pros and cons. Pros was just that it will leverage UE replication as is. Cons was resource cost because there will be a beacon per server and a connection per actor. Or something like that 🤔

[tranquil yoke]

Thanks for your help

[violet birch]

np and good luck. Fun to see that your are going like 99% the same route as we are 😄 I just wish I could help you more.
If I find out more I will ping you

[oak hornet]

hi does somebody heare know why when i create sessions gets created with "ERROR" status??

amazon gamelift

[violet birch]

@tranquil yoke Are you trying to avoid engine source changes? I know we decided that was inevitable for us.

[tranquil yoke]

Thanks

[tranquil yoke]

I understand I will have to make engine changes...
I have done lots of so far to support actor to be replicated via 2 net driver at the same time

I just don't want to over do it.
Because I think my use case is kind of simple

[timid moat]

Can there be more than one session on a dedicated server? If so, how do I know which one to join?

Thanks!

[kindred widget]

I think there "can" be multiple sessions on the same server, but there should not be. Should be one session per server. At least I have never heard of anyone using multiple sessions for a single server.

[sinful tree]

One could argue you could want multiple sessions if you set up the server to run multiple worlds. 🤔

[timid moat]

@kindred widget @sinful tree Thanks!

[kindred widget]

Yeah. I'm used to the ARK model. 😄 Each world is just a different server.

[sweet ore]

hi guys. i want to ask how to make a room system that give every player a room just like lobby but with 2 more things 1- the player can alter in this room change furniture for example 2- room dont close if player left so others can visit anytime
how to do this with unreal?

[clear gate]

Hello,
I have a capsule component attached to my character mesh, and when I get its rotation it shows correctly on client, but the server doesn't account for the animation and shows me a static value. How can I get an accurate rotation of this component on server? The actor and components are set to replicate

[thin stratus]

I assume you have set up your AttributeSet with proper OnRep functions per Attribute, right?

Because no, you don't have to bind on the server and notify the client. That's very wrong :D

[thin stratus]

That's actually only partial UE. If you need persistent Data like this, then you'll need a Database setup in your backend and store the room data.

Also it's not clear what a room exactly is. A Lobby is usually hosted by someone or something.
If that someone leaves, no one hosts anymore.

So no more Lobby/Room.

[latent heart]

Or you could save it locally.

With a SaveGame

[dark edge]

Are you processing animations on server?

set “Mesh Component Update Flag” on your skeletal mesh to “Always Tick Pose and Refresh Bones”

[sweet ore]

yes i have db to store the data but not this what i mean

i mean the room it self how to give it to every player

[latent heart]

You need some way to unique identify each player, like a steam Id.

Then you need to load and save the room with the associated id

[sweet ore]

i have id for every player but i'm stuck in giving rooms

i need to create only one level?

[latent heart]

Create a base, empty level and spawn the room contents dynamically.

[sweet ore]

thanks i will try it

[solemn raven]

I'm working on a multiplayer game with persistent state. I see there is stuff like RemoteDatabaseSupport is it generally best practice to store relevant state in postgres or another database and then access it from game servers? Is there a different database commonly used with unreal or different approach commonly used? Thanks

[latent heart]

Do you even want to use a database?

You could use a save game instead.

Depends on the scope of your game.

[solemn raven]

maybe I'll look into save games

can they be used for global things in the world other players would see too?

base with a new name, something like that

[weak linden]

Yes, that would work with SaveObjects as it would with other types of databases

The only "downside" to SaveObjects (this is entirely subjective based on use case) is that they are entirely controlled within the game/engine, there is no external access, which is totally fine if you don't need access to the data in an external tool

[pastel fiber]

I have no idea how the multiplayer game works.

Assume I want to create a competitive game with two groups, each of 5 players.
From one group's perspective, its players are allies, the other players from the opposite group are enemies.
It means a single game needs two groups.

Now, I host this game to a dedicated server, there are 100 groups are trying to play simultaneously.
Question:

1. Does the server need to run 50 instances of the game?
2. Is it possible for a single game instance (rather than 50 instances) to orchestrate 50 games?

[latent heart]

1. You need 50 server instances

2. Yes, but not something ue supports out of the box. Don't try it unless it's an extremely simple game that's probably better off run by a bit of javascript on a webserver.

[vital vault]

I have a function A work in server and it also call function B work in both client and server, what i need to function B can work both client and server in c++

[pastel fiber]

What does server instance mean? Did you mean each of the game instance runs on a separate operating system?

[latent heart]

Server processes then?

50 copies of the engine running.

[quasi tide]

You're going to need a beefy server to run 50 game instances 😅

That $5 server from DigitalOcean just ain't going to cut it

[latent heart]

Need a bit more context than that.

[vital vault]

Function B must be call both client and server but it called from function A has authority

[latent heart]

On 1 specific client or on all clients?

[vital vault]

local client

[latent heart]

So on a listen server?

Not a dedicated one?

[vital vault]

i need bind input both server and client

[latent heart]

There would be no point binding input on the srever, the server doesn't have input?!

[vital vault]

now it work only in server

AbilityHandle i set when owner has authority

[latent heart]

If you want to run a function on a client, make an RPC UFUNCTION with the Client specifier.

[pastel fiber]

Sometimes I experience Connection Lost when playing online game.
It occurs almost at the end of the game right before "You are victorious" or "You lose" is shown.
My internet connection is stable.

Is it an indication that there may be a listen server that quits too early? 🤔

[vital vault]

yes i did but still bind on the server

[hushed rain]

Anyone using Steam sockets? Is there a big increase in ping for players?

[valid imp]

I wonder why UE does not simply offer chunking built in. It seems trivial to just split things and send multiple RPCs.

[pallid mesa]

mhm

It'd be cool, yeah

at a user level it isn't that trivial as you need to check against the reliable buffer

so it'd be cool having a type of rpc that streams data over time as long as the reliable buffer allows it

[timid moat]

I'm using this code to create a session, start it and then find and join, but it doesn't find any: https://cedric-neukirchen.net/2021/06/27/ue4-multiplayer-sessions-in-c/

Any idea about what it is happening?

Thanks!

[clear gate]

Thank you very much!

[dark edge]

If you have to ask that question you aren't going to be making something that needs 50 instances anytime soon

Start small

[low helm]

Start small, make 4 arenas in one server so 8 teams can fight

just like the good old fashioned WC3 maps

where you just have another landscape off to the side

[quasi tide]

@fathom aspen GMC is 30% off if you wanted to try it

[verbal tendon]

I'd recommend using EOS

[blazing spruce]

Hi, im having an issue getting my client to have input on a security camera system, so essentially player walks up to a control panel, presses the interact key and then it needs to disable their input so they cant move and then enable input on the control panel for the cameras so they can cycle between cameras when using it.. works fine for the server ofc but the client wont enable its input, how can I get it to let the client have input cause the EnableInput event aint doing anything for the client?

[verbal tendon]

RPCs

on input on client -> call serverside RPC, do things, call clientside RPC from server, etc...

Check out the pinned messages

[timid moat]

somewhere. But it doesn’t answer my question.

[proven fog]

Do clients get AWorldSettings?

[fathom aspen]

Already bought it, didn't got to look into the forbidden knowledge just yet tho 😛

[fathom aspen]

Yes it's replicated

[quasi tide]

You spent an arm & a leg and haven't even tested it out? Jeebus

[fathom aspen]

Lmaoooo, a kidney too

[twilit radish]

But why x)

[quasi tide]

Imagine - giving up your kidney to not use the CMC and still use the CMC anyway

[fathom aspen]

For the fun pain?

[quasi tide]

That'd be like the only thing I do for a couple of days. If I bought the GMC that is

[twilit radish]

Can you for fun give me 300 dollars too? 😛

[fathom aspen]

300 * 💵 , here it's all yours now

[twilit radish]

Lol

[twin juniper]

hi, i'm teleporting a char via teleport blueprint on server. is there a way for a client to catch a pre teleport event so that i can spawn a fx at exact moment before the character is teleported on client

[verbal sundial]

When I open and close doors, the old door location stays there. I'm able to walk through it, but the old image is still there. Any ideas why?

[fathom aspen]

I'll believe this statement since it's being made by a handsome face girl

Well it's obviously not Good Looking

[fathom aspen]

I see nothing fancy about it, but you spawning two instances of that door and animating one instance

No clue how you're handling collisions, but I wouldn't care for collisions as long as things are not looking quite right

[fathom aspen]

I have not been punished enough by CMC to tell you the exact answer, but I would imagine Teleport would notify the client of the teleport before that happens for them, so it's where you spawn the FX you want

[twin juniper]

I dont know where that notification is in blueprints

[fathom aspen]

It doesn't exist™️

Any CMC code you want to mess with is found in C++

I mean the other way would be to reliable client RPC, spawn the FX, then server RPC back with the teleport function but I can already smell a bunch of issues with this

[fathom aspen]

Also belly is empty, so that's really hard™️

Hope? More like hopeless despair?

That's not new, I've always been

[mortal mica]

what's the correct way to set a replicated property on a spawned actor, that I need to use in BeginPlay... if I just set it on spawn ("expose on spawn") it just doesn't get replicated before object creation on the client

[fathom aspen]

Right, not if it's an unmapped property

The correct way is to have it bound to an OnRep function that gets called when it replicates

[mortal mica]

so you mean have whatever behaviour I need to do in BeginPlay be done in an OnRep function instead?

[fathom aspen]

Not what I said. I said, any unmapped property that you want to guarantee that it has replicated to client has to be bound to OnRep

OnRep and BeginPlay are two very different events in time

On BeginPlay you get replicated properties that are the so called anciently POD types

float, int, etc.

[mortal mica]

what if I don't need to keep replicating/updating that value, it's just one off for spawning

is there a better way than an onrep var?

[fathom aspen]

That has nothing to do with the OnRep though, and no there is not

And what you would want to do is make it COND_InitialOnly

[mortal mica]

roger

[tranquil yoke]

Anyone knows how Engine decide local Role and RemoteRole for an actor, where is that code ?

[fathom aspen]

By default, inside AActor::PostSpawnInitialize and it gets overridden for other notable actors like the client-onwed ones in a bunch of different functions inside UWorld::SpawnPlayActor, and in APawn::PossessedBy and for non-owned inside UActorChannel::ReplicateActor

LocalRole and RemoteRole are also set to Authority and None in ctor of AActor

[tranquil yoke]

I am looking for non owned one, I will check that out.
I am trying to override the Roles according to my needs, where i am replicating actors over the BeaconNetDriver.
Where I am having this issue.

I hope this makes sense

[fathom aspen]

You caught me in the weakest point of my day (was heading to sleep), so nothing makes sense to me atm

But good luck

[tranquil yoke]

@fathom aspen good night thanks for clarification, try to have a look in your morning.

[timid moat]

Hi!

I've created a session, I've started it without any error, but when I try to join it, I can't find it. What could be the reason for this? I've used this code: https://cedric-neukirchen.net/2021/06/27/ue4-multiplayer-sessions-in-c/

Thanks!

[prisma coral]

Hey guys, are object references supposed to become invalid after using a run on server custom event? I am trying to spawn an actor from the server based off of data stored in an object. the object is always valid when i access it locally but as soon as I try from the server it just returns null even if i pass it through the event itself as an input. I am mega confused as to why this even happens
Cheers

I have triple checked the objects validity with a print string

[obtuse pendant]

hey folks,working on a prototype for a multiplayer game(almost ready) C++..wanted to implement a chat system if anyone has implemented a chat system could u plz let me know how u approached or share ur codes so i can get started with mine

[bitter oriole]

Send server event with string, multicast the string back to everyone

The multiplayer part here is not complex

[timid moat]

Hi!

Do you know if anything has changed with the sessions in Unreal 5?

Thanks!

[plucky prawn]

is your Item type set to replicate?

[sweet ore]

hi
i want the player when press left mouse on other players show thier name on top right of the screen
so i need the same text to change to players names
i tried many things didnt work with me
anyone knows?

[plucky prawn]

what things did you try that didnt work for you

[sweet ore]

i have the name variable working fine

when i press print the currect name

but when i try to press to show it on top text it give me my own name

not replicated

[plucky prawn]

you still have not provided any useful information at all. what class is this in? how is it being set? what function/event are you printing this in? what are the replication settings for that variable?

[sweet ore]

i'm telling you that i have the naming system working so when i press to any player it give me his name in print i just need to show it in the text when i press

i tried calling this (any many other things)

instead of print

and it give me the name not replicated only my own name

[plucky prawn]

GetPlayerCharacter 0 🤔

[sweet ore]

i have the same get playercharacter 0 in the print

and it is working

[sweet ore]

sorry you are right i'm getting the variable from the player not from casting

[prisma coral]

its just an object class with a few variables in it I couldn't find any replication settings in there I just kinda expected it to pass on through like any other int, etc

[plucky prawn]

if its a UObject then you will need to check out the blog post from Jambax about replicating UObjects

[prisma coral]

alright thanks ill check that out

[sweet ore]

@plucky prawn thank you for noticing me i tried this and call it and it is working

[twin juniper]

hi guys iam trying to spawn player as per there team i added tags to player start and iam spawning its working fine player are spawning but either spawning tea a player or team b player

here the code

UClass* AMainGameMode::GetDefaultPawnClassForController_Implementation(AController* InController)
{

TArray<AActor*> playerSpawnsList;
UGameplayStatics::GetAllActorsOfClass(GetWorld(), APlayerStart::StaticClass(), playerSpawnsList);
float randomNum = UKismetMathLibrary::RandomFloatInRange(1, playerSpawnsList.Num());

if (currentPawnToAssign == nullptr)
{

	for (playerListNum = 0; playerListNum < playerSpawnsList.Num(); playerListNum++)
	{
		GEngine->AddOnScreenDebugMessage(0, 5, FColor::Green, TEXT("Started"));
		UE_LOG(LogTemp, Warning, TEXT("STARTED"));

		if (firstPawn != nullptr &&  secondPawn != nullptr && playerSpawnsList[randomNum]->ActorHasTag("Asura"))
		{
			currentPawnToAssign = firstPawn;
			GEngine->AddOnScreenDebugMessage(0, 5, FColor::Green, TEXT("Asura"));
			UE_LOG(LogTemp, Warning, TEXT("Asura"));
		}

		if (firstPawn != nullptr && secondPawn != nullptr && playerSpawnsList[randomNum]->ActorHasTag("Dev"))
		{
			UE_LOG(LogTemp, Warning, TEXT("Dev"));
			currentPawnToAssign = secondPawn;
			GEngine->AddOnScreenDebugMessage(0, 5, FColor::Green, TEXT("Dev"));
		}
	}
}
return currentPawnToAssign;

}

I added this code in game mode

its looping in for loop but dont know y its taking only one if statement

can any one help me with this?

[bitter oriole]

Knowing what the logs output would be helpful