multiplayer

[halcyon totem]

my player starts arent loading in on time Actor channel failed: [UActorChannel] Actor: Replicated_PlayerStart_C

[waxen socket]

Hello, I have a general question about actor and component replication. 👋

When designing an enemy that is composed of multiple separate meshes whose movement will need to be replicated, are custom static mesh components preferred, or is it better to make each piece a separate actor?

I see that bComponentReplicates will replicate the component transforms as well but I wonder if there's a catch I might run into.

Any advice would be appreciated. 🙂

Cheers.

[ancient lily]

are there any references available for built-in and on-the-fly server changes without reloading the level on the client?

[graceful viper]

getting an exception here, why? Only happens if theres more than 1 player in the game:

[chrome bay]

Beause there is no controller for the second player on each client, therefore you won't get a widget

[tardy fossil]

if you absolutely can't use animations for this, i'd say have multiple mesh components under 1 replicated actor and replicate each position / rotation all at once, having a seperate actor for each will be some major overhead

[waxen socket]

Thanks, Omnicide. I think that's what I'll try first. 🙂

[graceful viper]

oh right thanks

[thin stratus]

HasAuthority might return true for clients in the GameInstance, since authority doesn't mean server. So you'd want to test for server instead. And no, you could only try to package the project with a different GameInstance, but I wouldn't advice to do that

Also keep in mind that the GameInstance is not meant for gameplay code

[icy jetty]

😲 I thought that was the whole reason for switch has authority

How else can you check for server?

Ah nice

[thin stratus]

Or IsServer fwiw

Authority means the connection has authority over the object/actor. A locally spawned actor for example. The client has authority over that.

[icy jetty]

ah that makes more sense

[thin stratus]

That's generic enough to fit more into #programmer-hangout #lounge or maybe #ue5-general (only one of them). Multiplayer seems a bit out of place or?

[dark edge]

I would replicate the state that DRIVES the mesh movement

What's the use case, humanoid?

[waxen socket]

Hi Adriel, thanks for your interest. 🙂 I'm building a boss with an arm with a magnet on the end. The magnet will pick up other actors via component attachment. I'm wondering if my magnet should be a component of the larger boss or a separate actor attached to the boss. 🤔

[ancient lily]

are there any references/resources to run a custom server (for instancing + fast movement replication) together with a dedicated server (for pathfinding and maybe player information&inventories)? i found a guy who does that with his own java server (yt: Unreal game dev with Yaz) and i find the concept pretty good for scaling users in a (massive) multiplayer online game

i wonder if more people explored this concept already

[queen escarp]

hey guys

two problems

https://gyazo.com/17d04b8c5c5d68ca214a9128115f08ba

its only replicating on one of them ? (playing as ListenServer)

[spark pelican]

Hello, I have a bit of an issue with the outer of a replicated UObject. My current setup includes an actor component that houses a replicated and instanced UObject. I add the UObject to the Replicated Subobject list on the actor component's owner.

This works the way I want it to; however, after the client goes out and in of the net cull distance, the outer on the client still points to the original actor component and actor, and not the newly created ones. From what I have learned, I believe this is due to me having the outer as the actor component (due to instanced), and the UObject being added to the actor's subobject list.

I know the simple solution of getting rid of the instanced property, but it is very convenient for my situation so I am looking for a way that keeps my current implementation. Thanks in advance!

[queen escarp]

anyone :/ ?

[queen escarp]

everyone on holiday it seems

good for them x)

[ivory bear]

My Mesh_3p animatino montage never fires. Anyone have any guesses?

[dark edge]

Depends on how reusable it has to be

Just adding components to the boss is fine but if you want something other than a magnet sometimes or want other dudes to have the magnet then consider making it an actor, just like a weapon

[queen escarp]

@ivory bear are u even calling the event ? that image gives us nothing really :/

Adriel could u help me 😛 u know this i know u do

[ivory bear]

apologies, here is the top half. The E key is calling it. The Mesh_1P montage plays on click, nothing happens for the Mesh-3P

[queen escarp]

can barely see the text tho, did u try printing all the way and seeing where it dosent work ?

[ivory bear]

Yes, the string after the Mesh-3P call shows on screen.
Here is my character setup

This is the multicast and the print string at the end fires, just no animation plays.

[queen escarp]

the print on comp+lete playes ?

oh ok

[ivory bear]

yes

[queen escarp]

then its something wrong with the animation or whatever

not in the code

or what is it suppose to do ?

[ivory bear]

When I press E, both the Mesh-1P and Mesh_3P should do a "fire rifle" montage.

[queen escarp]

ok

the MC fire montage ?

[ivory bear]

yes, the MC fire montage appears to complete and reach the print string, but the animation does not fire on screen

[queen escarp]

hm thats weird

idnno im kinda rookie myself to

[ivory bear]

Its funny, because I got aim offset and projectiles replicating...just not the ^&%$^$ montage that fires and the muzzle flash.

[queen escarp]

listen server ?

[ivory bear]

got all that working when 2 players and play as client

when I switch to Listen Server, my aim offsets work, but line traces (projectiles) do not.
After moving very close to each other, I can see that the anim montage is firing...jsut so slight you cant see it unless you are on top of each other. Odd, but promising.

[queen escarp]

well, ive only done dedicated server somehow everything works there , but im trying with the listening server now abit more trickier

however ppl in this channel usually is very helpfull just today ppl are chilling i suppose

[ivory bear]

yeah gotten some good help and other days things fly by so fast people miss it.

"play as client" creates a "dedicated" server for you, right.

[queen escarp]

well your playing on the "dedicated server"

client is both server and client

the "host"

[ivory bear]

I get 2 "clients" and neither is server. Listen server is both a client and server, right?

[queen escarp]

one of them are both yes

[graceful flame]

No, listen is a server that also plays the game. The other is a dedicated server which is just a console without any GPU or audio.

Listen is not also a client.

[queen escarp]

well couldent u just call it that tho ?

[graceful flame]

Because a client doesn't have authority but a server (dedicated or listen) does have authority.

UE uses the server authoritative approach instead of Peer 2 Peer networking.

[queen escarp]

aye

[stoic acorn]

If you were to create a radial 'force push' that emanates out from a player character, would simply creating a blocking volume and scaling it to push the opposition character away from yourself suffice?

or would you do it with a more deterministic method?

[ivory bear]

For 2 players:
Play As Client means a hidden dedicated server and 2 clients
Listen Server, the editor is both the server and the client.

[clever hound]

void AMeleeBase::NetMulticast_SpawnAura_Implementation(UNiagaraSystem* _EffectToSpawn, float _LifeTime, FName _SocketName, FVector _SpawnLocation, FRotator _SpawnRotation)
{
    UNiagaraComponent* SpawnedEffect = UNiagaraFunctionLibrary::SpawnSystemAttached(_EffectToSpawn, GrippableMesh, _SocketName, _SpawnLocation, _SpawnRotation, EAttachLocation::KeepWorldPosition, true);
    SpawnedEffect->SetVariableFloat(FName("LifeTime"), _LifeTime);
}``` ```cpp
UnrealEditor_Niagara!UNiagaraComponent::SetVariableFloat() [D:\UnrealEngine-5.1.1-release\Engine\Plugins\FX\Niagara\Source\Niagara\Private\NiagaraComponent.cpp:2293]
UnrealEditor_ProjectVR!AMeleeBase::NetMulticast_SpawnAura_Implementation() [D:\5.1.1 Projects\ProjectVR\Source\ProjectVR\Private\MeleeBase.cpp:1043]```
Im trying to set a variable in a spawned niagara which sets the loop duraction. But if I play as a client it crashes and gives me that crash report. When playing as the server it works as intended
Edit* Its: ```Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x00000000000008f0```

[ivory bear]

Got it working! Seems my values on the montage we not right. Changed them to what you see here and I see my rifle fire montage animation!
They were something like 0.25 and 1.0 ( I think)

You said code looked right, so I dug into the animations...thanks!

Now to figure out he daggone muzzle flash replication!

[clever hound]

I launched with debugger and got this
Edit*: SetVariableFloat() is UE engine function

[plucky prawn]

You could try IsValid(SystemInstanceController) instead

[clever hound]

I should have been a bit more clear, that is the function in the engine

How others set niagara variables from C++ then? cpp void AMeleeBase::NetMulticast_SpawnAura_Implementation(UNiagaraSystem* _EffectToSpawn, float _LifeTime, FName _SocketName, FVector _SpawnLocation, FRotator _SpawnRotation) { UNiagaraComponent* SpawnedEffect = UNiagaraFunctionLibrary::SpawnSystemAttached(_EffectToSpawn, GrippableMesh, _SocketName, _SpawnLocation, _SpawnRotation, EAttachLocation::KeepWorldPosition, true); SpawnedEffect->SetVariableFloat(FName("LifeTime"), _LifeTime); }
Is it not like this?

It works playing as the server but not as the client

I also tried replicating the float I input to the _LifeTime

Also doing the variable change with server RPC didnt work

[hollow swallow]

Whats the correct way to move all the players to a new map?

This puts them all into their own map not the same one

[stable grotto]

Connect to dedicated server IP

[hollow swallow]

ahh got it with the server travel command

[queen escarp]

@ivory bear nice 👍

[stable grotto]

I want to set chest opened/closed for each client based on a bool.
For example: Client 1 ChestOpened bool is true when connected to the server they see the chest opened and if Client 2 Connects with ChestOpened bool is false they will see the chest closed so its client specific

how can I do it?

[hollow swallow]

Im a big noob, but i think a repnotify on the bool would work?

I also have a question. I have a lobby, you can select a character, it sends the character you selected to the game instance. The game starts, it moves everyone into a new map, in the game mode, i use spawn default pawn for override and cast to the player controller, run a function on the player controller that grabs the selected character from the game instance and passes it back, then spawns an actor in the game mode. This is working well but only for the host, not the clients, they all seem to not be able to read the variable. any ideas?

i want each client to be able to get their selected character from the game instance when they spawn

[sinful tree]

Game Instance only exists for the local computer. It's fine if you want to store the selected character class there while they're moving to a new level, but once the transition to the new level happens, each player controller would need to send an RPC with their selected character class to the server and once they've done so, then you can spawn their actor for them.

[sinful tree]

An array of some kind that is associated to the players. It can be replicated w/ notify, and the OnRep function you can loop through the array and determine if the local player's on the list, and if so, the chest is open.

The server can also use this array to validate if it can be opened by a player that is interacting with it.

[stable grotto]

But how will the chest have the player reference if the player has just connected or became relevant 🤔

another solution I thought of would be the chest on begin overlap check if the client character has chest opened bool set to true then play the animation to open the chest..

[violet citrus]

Is Anyone looking for Unreal Multiplayer Developer ??

[queen escarp]

for work u mean ?

or for help *

@violet citrus

[cursive steeple]

what does it depend on if the chest is opened for a specific client? Does every client start with the chest closed unless they open it themselves or?

[violet citrus]

yah I mean i'm looking for job opportunity as an Unreal Mutiplayer dev

[queen escarp]

oh ok well i mean there is some jobb channels id think you would have more luck there

if you dont wanna work for 1$ a day helping me lawl

[violet citrus]

@queen escarp 😂 okay

[stable grotto]

So in the level the chest is closed, I want whenever the chest is relevant to the client it will check if the client has chestopened bool set to true, if its true chest is opened if its false it stays the same

[shadow hatch]

is there a way for me to exclude the owning client from this equation? i want the code to run on server and everyone elses client using a multi but not locally because its already done earlier

[west robin]

Where is the best place to get player state as a client as apawn? I'm trying to wait until the player state is set up so I can bind a delegate, however I can't seem to find a good place to set it. PossessedBy is where I'm setting it on the server but that's not being called on the client

[pallid mesa]

check if the pawn is locally controlled and if it is, dont execute logic on the mcast

[pallid mesa]

see OnPlayerStateChanged delegate on the Pawn

its called on client/server

[west robin]

@pallid mesa Thank you! I will try this, I saw that but didn't think to use it as I was looking for something like Init!

[pallid mesa]

yeah that's the best one you got

in fact Epic added that after my PR of suggesting making "SetPlayerState" virtual

haha

we all wanted something like that for a long time

[west robin]

@pallid mesa You said in Pawn right? I can't seem to find it, looking over Pawn.h I can't see it anywhere

[pallid mesa]

https://github.com/EpicGames/UnrealEngine/commit/a16760aedbdf9c44330736c8b69ba2b9c0fc5697

[west robin]

What the... I'm running 5.2.1 and my Pawn.h is different. Thanks for pointing me in the right direction though! Appreciate it, that'll be really helpful! 😄

[pallid mesa]

didnt this make it to 5.2?

wew wow wah

[west robin]

Its a 5.3 change!

I thought I was going insane haha

[pallid mesa]

well u can override OnRep_PlayerState if thats virtual

[west robin]

Yeah, I'll just try that for now, but its good its coming. Will be super useful!

[pallid mesa]

👍 😄

remember that onrep_playerstate is not called on the server

so.... be aware of that!

[west robin]

Thanks for the info dude! 🙂

[tulip pelican]

Guys i need help, me with my frind try to make multiplayer game, using listen server,but unfortunately our your session not visible and can't be found we using Advanced Sessions Plugin and Using Steam Sockets (app id 480 ) i using Unreal engine 5

[shadow hatch]

yup that worked though i swear i tried it before and i got very weird results :d must have been something else wrong with the previous code

[pallid mesa]

heheha oki! Glad it helped ^^

[floral elbow]

How do I get access to different variables on my character controller?

I have two seperate values on chrCon1 and chCon2 but my keypress is logging the same value on both the serverClient and the client

https://gyazo.com/ea618a4074a2ec2a1215f435f46d6165

the other player has a y of 0 and it logs 0,0,0 on both clients

Am I wrong for setting the value on the controller or does it need to be state somewhere

[cursive steeple]

not sure what the screenshot is supposed to be showing us.. maybe reformulate your question in a more coherent way? Also you could post the code for the logging you're doing.

[floral elbow]

Figured it out

I wasnt using the playerState blueprint

I just had variables on my character controllers and thought ue5 would know which client is asking for the data

[keen hound]

how would I do a dedicated server list?

[sinful tree]

Well again you need some kind of reference to a player who has opened the chest. So like... Their unique net ID or some other thing that won't change every time they connect to the game but can be uniquely attributed to that player.

[glossy kettle]

[pallid mesa]

[glossy kettle]

vori have you been enjoying Iris lately

[pallid mesa]

a bit yeah

[glossy kettle]

i'm glad 🙂

[pallid mesa]

and do you?

[glossy kettle]

i haven't formulated a good opinion of it yet, maybe when 5.3 drops i will post up some benchmarks vs custom backend

we should all strive to be liberated from FRepLayout

[pallid mesa]

maybe write about your custom system

[glossy kettle]

i doubt it would be that interesting

it's just CRUD over wire after all

[pallid mesa]

thats worth writing about

many problems to solve to get there

[hollow eagle]

Iris is still buggy enough to not really be comparable to anything else sadly. Just ran into a fun issue with their method of caching ustructs being dependent on module load order. Fixed in main (and maybe 5.3?) but it's enough to make me concerned about doing much with it right now.

[glossy kettle]

🤨 dubious

[glossy kettle]

very well I will think on it

thank you vori

[pallid mesa]

yeah dont put that on production, I have it enabled on my playground project

I hope it will be more stable on 5.4

[hollow eagle]

Also there's a fun issue where you can't use a server rpc from the beginplay of a component that just replicated. I have no clue what causes that one.

[pallid mesa]

I am also willing to learn from it, i think others will aswell

[pallid mesa]

in main aswell?

[hollow eagle]

I don't know if that one is fixed in main or not

Hard to track down commits relating to that

(and I don't have a main build right now)

[pallid mesa]

👍 thanks for sharing siliex

hopefully we get a more robust set of test cases before it replaces current replication system

[glossy kettle]

damn wtf is that super react bs

my muscle memory sabotage me

ah well, to a good cause it went

[glossy kettle]

i could it explain but get you wouldn't it

[hollow eagle]

it's not a network ordering issue if that's the joke, probably just iris not setting up some replication state until after BeginPlay which is clearly incorrect behavior

[glossy kettle]

"it's not a network ordering issue"
[describes network ordering issue]

Sheesh

[hollow eagle]

it's not though

all the data necessary is already on the client

[glossy kettle]

hmm

[hollow eagle]

it just hasn't been applied before beginplay for some reason

[glossy kettle]

i guess it depends if ur -Wpedantic

[hollow eagle]

it's an ordering issue, just not a network one

[glossy kettle]

-Wextra

[hollow eagle]

we only accept msvc args here

sorry

[queen escarp]

hey guys

https://gyazo.com/17d04b8c5c5d68ca214a9128115f08ba

its only replicating on one of them ? (playing as ListenServer)

anyone ?

[lost inlet]

It would be good if it was clear which one was the server and which one was the client, and any actual context about how the rotation is networked

[queen escarp]

left one is listenserver

and the turn is "AO"

aimoffset in the anim bp

[lost inlet]

yes but how is the look rotation setup

a crumb of context please

how is the input sent to the server, how is it replicated, etc

[lost inlet]

waiting for the networking part to come in

[queen escarp]

i mean isent like everyting in the anim bp replicated ?

by default ?

[lost inlet]

no, and it can't even be replicated

[queen escarp]

oh okey, but how come its being replicated on the client from listen thyen ?

[lost inlet]

again, I can't tell you this with actually knowing the networking part of what you're talking about

ABPs have no replication, and rely on other networked state to look consistent between clients

[nova wasp]

think of them as running on each machine individually

so it uses the state of the character which is replicated to make the local animation state

[grave kestrel]

Hey all I'm working on replicating swimming and currently I have a function in tick to check when to set the movement move to swimming or not but this seems to swap all clients movement mode instead of just that players.

Here is the function:
https://blueprintue.com/blueprint/8hd5vdtb/

Any help is appreciated guys, thanks!

When another player tried to enter the water, any in the water will temp swap to falling until the player enters the water. It's driving me nuts

[queen escarp]

yeah but as u can se on the 2nd video when aiming it shows on both

but not from the left one

[grave kestrel]

Had an issue like this for replicating aiming up and down. Had to cache the y axis from the mouse input and send it to the server for it to replicate properly

[lost inlet]

This is why I was asking how it was sent to the server and how the server networks the rotation

All I got was a zoomed out ABP snippet

[queen escarp]

oh

hmm ok

ill look into that

@grave kestrel how would i do that did u use a tutorial or something or ?

[grave kestrel]

created a server function to pass the camera's pitch in and referenced that in the anim bp

[spark pelican]

@queen escarp How are you setting your ReturnValueY and Z. I assume you are using GetControlRotation which if I am not mistaken is not replicated. Try using a combination of GetActorRotation and GetBaseAimRotation, those should work.

[queen escarp]

yeah

so im setting this in the playeranim_BP

but i need to calculate it inside the player and send info to server then send it here instead right ?

[grave kestrel]

I would think so yeah, just get a reference to the player, and cache it to save on casting constantly in the update animation event, and set the same values in the bp animation

I have a pitch value both in the character and bp anim, and the bp is set on the server for the character and in the update animation event I set the bp anims pitch to whatever the characters is and have that set to replicated with a constricted range from -90 to 90

but that's just for replicating up and down, I had no issue with aiming left and right

[queen escarp]

@grave kestrel wdym cache it to save on casting ?

ok now i got it working

however

nah i think were good thanks 🙂

[grave kestrel]

When you init the bp anim you can cast to the character and save that as a reference, or cache it. That way you're not constantly doing a cast to the character on the update animation event. Glad to hear you got it working!

[queen escarp]

Yeah i know that part o though cache was a special function or somerhinf

However now in updating to the server each anin update frame

Isent that lag causing ?

[grave kestrel]

I've never experienced any major lag from it, I'm just passing the float value to the server and using that to set it on the anim bp, I wouldnt' think that's very resource heavy

[queen escarp]

Oh okey

[grave kestrel]

and the pitch is only updated on the mouse input axis events so there's that too

[sinful tree]

Each float is like 8 bytes. 60x per second = 480bytes/s which isn't very much. You could save some of that by updating it less frequently and interpolating.

[queen escarp]

Well idnno what interpolating means really but i changed it so it onöy updates while im aiming aince its when im using it but

[sinful tree]

Eg. On the server you could be setting the replicated values 15 times per second, putting the cost per float at 180bytes/s.
On the clients however, you could be using tick to transition between the replicated value and whatever the current value is every frame, so it smooths it out for you making it look like 60 FPS. You can do this using FInterpTo Constant with the target being the new value and the current being whatever the current value is.

[clear island]

when using the push model, MARK_PROPERTY_DIRTY_FROM_NAME makes a property replicate immediately right? similar to RPC behaviour Im assuming

[queen escarp]

Hmm i think i understand never done it obvi ill try it tomorrow

[grave kestrel]

hoping to get some help on figuring this out. Thanks

[dark edge]

show where you're calling that function

[grave kestrel]

from what I gather somehow when calling the set character movement mode in it it's setting it on all clients, it does this when swimming and I attempt to jump when at the surface of the water

as I change the movement mode to falling and call a server function to launch the character

[dark edge]

I would start by testing to see if set movement mode should happen on owning client, server, or everywhere

I see no filtering on authority or locally controlled so your logic is running on all machines

[grave kestrel]

I've tested adding in an authority switch as well, same result

[dark edge]

@grave kestrelshow what SR Update Movement Mode does

but this code is goofy, you're just trusting the client to set swimming or not

[dark edge]

I'd test by hooking up a button to ServerUpdateMovementMode

[grave kestrel]

Yeah started single player side and I'm migrating it to replicated so it works correctly lol

[dark edge]

check that you can start swimming without affecting others

[grave kestrel]

funny thing there

[dark edge]

Also Water Volume is not a good name for a boolean

Booleans should be questions "Is in water volume?" "Wants to sprint?"

[grave kestrel]

if swimming into a water exclusion zone and dropping back into the water volume it works right

[dark edge]

I don't see anything that would obviously communicate with other instances of this character but it's all kinda goofy

[grave kestrel]

nothing I can do about the bool, that's epics lol

[dark edge]

What's the test for if should be swimming?
"Character should be swimming if ................ and .............. and not ............"

ooooooooooooooh ok i think i know

you are changing the properties ON THE VOLUME

anyone else IN THE VOLUME will be affected

[grave kestrel]

well

you think that

[dark edge]

You aren't just checking stuff and deciding if you are swimming, you are actually setting state on world objects

[grave kestrel]

however a player standing outside can jump and will change to swimming after landing if someone is in the volume

[dark edge]

whatever you're doing here, don't do that

are you intending to change the state of volumes at runtime?

Start with:

Tick -> select movement mode based on CMC.PhysicsVolume.WaterVolume

that should put you in swimming when in a water volume and not swimming when not

[grave kestrel]

hmm, thing is the new water body system doesn't have any water volumes afaik

[dark edge]

it won't handle the literal edge cases (getting out of water) but it'll be a start. You should not be changing whether or not a volume is a water volume

You might be saying the entire atmosphere is a water volume

what does get physics volume return if you're not in one?

why do you even care about water volumes if you aren't using them? What is your actual test for if you should be swimming?

"Character should be swimming if ................ and .............. and not ............"

looks to me like character should be swimming if sphere trace hits a water body

so just stick to that

none of this volume stuff

[grave kestrel]

yeah I realize, however the characters physics don't change to swimming unless the implementation of the water volume is changed

[dark edge]

What happens if you just set movement mode to Move_Swimming in midair?

I'm not sure if the CMC does volume property checks or not, if it does then just add physics volumes to your water areas

you probably don't have to do half of what you're doing here

either way, setting the properties of physics volumes at runtime is not the approach

[grave kestrel]

That is generally the case, I tend to be too literal and less abstract about the approach sometimes. Physics volume is showing default physics volume regardless of location so changing that to a water volume is probably is what's screwing up the clients

[dark edge]

THE WORLD IS NOW WATER

[stable grotto]

yes I have a player id, but how will I initiate the check for it when the player connects or become relevant to chest?

[sinful tree]

You would need to save the state of the chest somehow on the server I imagine and so, when loading the data into the chest, you'd set the array. The array being set as replicated w/ Notify will give you a means of checking - in the OnRep, you can check if the local player is in the array, if so, they've already opened it, so it should show opened, if not, then they haven't opened it so it should appear closed.

When a player opens the chest succesfully, then they would be added to the array as well, and again, that would fire the OnRep which would then be able to show the chest as open.

[stable grotto]

Okay I will check thanks!

If A Server event executes a server event within it does it effect anything performance wise?

[latent heart]

Not likely

A server running a server event will just run it like a local function

[stable grotto]

great, if a server event is set to reliable, and executes other events that are just normal custom events not marked reliable, everything will be reliable still right?

[latent heart]

Correct

As long as it's the server that's running them.

If a client calls the unreliable server event, it will not be reliable.

It does make me wonder why you would even mark something as a "run on server" event in this case (except the first one)

[stable grotto]

can you give an example?

[latent heart]

Not really

[stable grotto]

ohh you said if a client calls unreliable server event

of course haha

[latent heart]

If a client calls a function marked as "run on server" and "unreliable", it will not be... reliable.

[stable grotto]

i read it as if client called reliable server event it wont be reliable sorry haha

[latent heart]

Why do you have a Server event calling other Server events?

Why are the subsequent ones also marked Server?

[stable grotto]

because that subsequent event sometimes can be called by its own

[latent heart]

Fair enough.

There will be a tiny bit of overhead to check it's a server before running it, I expect.

But nothing to worry about.

[keen hound]

How would I search for dedicated servers?

on a server list btw

[sinful tree]

Like you want to filter your list of widgets?

[hollow swallow]

in the editor, if i open 4 clients, make 1 host a lan game, the other 3 have to refresh 3 times before it shows up. Is there any way to make it show up straight away?

doesnt matter how long i wait, always need to refresh 3 times

[keen hound]

I just want to create a server list

For dedicated servers

[sinful tree]

You can change on your find sessions node the "Server Type to Search" to "Dedicated Servers Only".

[hollow swallow]

Datura do you remember my question yesterday about the character classes?

[sinful tree]

A little bit.

[hollow swallow]

so i added an event to set the class on the server aswell when it gets the class from the game instance and both of those print the correct class.

But in the game mode on the override for SpawnDefaultPawnFor function its still not getting the correct info. Is it because its not updated fast enough?

[sinful tree]

More than likely. "GetCharacterClass" will take time for the client to actually receive the RPC, then it takes time for the server to receive the client's response. It doesn't happen instantly.

So that means you may need to put in some coding that handles when the server is receiving the class that it should also spawn the actor for them.

[dark edge]

Like Datura said, you have a race condition here. You'll want to do something once you have all the info like call RestartPlayer or something

[hollow swallow]

yeah i had Event Handle Starting New Player which gets the player start, then runs Restart player, which then fired the rest off. Ill try re arrange everything to call it after it has set the class. cheers

P.S i hate race conditions xD always getting stuck with them

Yep that seemed to work much better. It got 3/4 of the characters right 😂 one of them is a dupe of another though

[keen hound]

this didn't work

[undone notch]

hi i creat multiplayer with aws on UE5.1.1 Source Build Engine . So my both player joing the lobby or same session But when i try server travel map they are not in same map , Do anyone know what is the issues ?

[hollow swallow]

How are you trying to change map? Are you using the console command with server travel?

[undone notch]

yes

[hollow swallow]

That is how mine is set up, i just got it working yesterday

[undone notch]

yes like this

[hollow swallow]

When that runs, what does it say in the output log?

[sinful tree]

Is this on a listen server, and if so, is it the host clicking the button?

[undone notch]

Dedicated Server

using Real AWS gameLift

[sinful tree]

Then this won't work. Clicking a button on a client isn't replicated to the server automatically and you want hte server to execute the "Server Travel" command. Additionally, you want to add an additional space after the "servertravel" in your append.

[undone notch]

so on append wite this Server Trave

[sinful tree]

no "servertravel "

Basically this is considering "servertravelAWS_Lobby_Map" is the command.

[undone notch]

so waht shoud i do ?

ADD SPACE ALSO BUT NOT WORKING

[hollow swallow]

you need to call it on the server

[sinful tree]

Clicking a button on a client isn't replicated to the server automatically and you want the server to execute the "Server Travel" command.
You need to RPC the request to the server and have the server execute it.

[undone notch]

how can i do that ?

[hollow swallow]

click the custom event, then on the right in the details panel where it says replicates, set that to server

[sinful tree]

(Except do it on an actor that is actually replicated, not a widget)

[undone notch]

OH OK

[undone notch]

I DID

[hollow swallow]

working?

[undone notch]

OK I ADD ON MY PLAYER BP

WHIC IS REPLICTING ON THE SERVER

nope not working yet

[pallid mesa]

u need to add the space

[hollow swallow]

"servertravel "

[undone notch]

now ok >

[hollow swallow]

yep

[undone notch]

nope sir didnt work to

[hollow swallow]

What's the output log say when it runs it

[undone notch]

not shwoing any log

[hollow swallow]

Are you sure that events being called?

[undone notch]

i write this

can you come in call and help me to fix it , I am ready to pay for the help

I am suck on this last 8 days\

[hollow swallow]

ill give it a go but i dont want any money, im very new myself though and ive never used dedicated servers

[sinful tree]

Put a print string immediately after your "V" input. Press V. Do you get a print on screen?

[hollow swallow]

go to the feedback and support channel if you want

[undone notch]

yes please

yes the button is working

[sinful tree]

Maybe disconnect the player controller from the console command. Shouldn't be necessary if you're trying to run it on a server.

[undone notch]

ok

[sinful tree]

Are you using GameLift Anywhere? I mean, when you upload your server executable to GameLift it takes some time for GameLift to normally receive the executable and process it to make it ready.

[undone notch]

yes

[sinful tree]

No. You have to upload a new executable.

You've changed the RPC functions.

The server doesn't know about it unless you've uploaded a new copy to GameLift

Yes.

Look into GameLift Anywhere.

It's supposed to be a thing to allow you to run the executable locally and still have it connected through GameLift

Lets you test dedicated servers through GameLift easily without having to go through the 2 hour wait process for GameLift to do it all XD

https://aws.amazon.com/blogs/aws/introducing-amazon-gamelift-anywhere-run-your-game-servers-on-your-own-infrastructure/

[dark parcel]

Hi lads, how would one smoothly interpolate character location/rotation that implements CMC?

[twin juniper]

I am creating a session and travelling to a game map lobby with Game Mode of Gameplay. Here I need to override ChoosePlayerStart so that the two players joining the session can spawn at appropriate player starts. But then when I travel to new map of Gameplay using seamless travel, I know players are persistent but I want the effect so that it is like spawning players at the player start of the new map using a function same as ChoosePlayerStart. How can I do so?

[thin stratus]

Wdym with Players are persistent?

They will respawn on the new map with the given GameMode and its playerstart functions

You shouldn't need to do anything special

[twin juniper]

But what if I want to use different ChoosePlayerStart function logic for different maps? Would I need different Game modes? Or should I use a boolean to track which map the game is in right now?

[thin stratus]

Different GameMode is cleanest

A child class fwiw

I usually have BaseGameMode and the 2 child classes: GameModeMainMenu, GameModeGame.
And then Game has Child classes like GameModeLobby and GameModeGameplay.
And Gameplay can then have even more fine grained children like Deathmatch or whatever fits your game

[twin juniper]

I am using seamless travel. So GameMode is persistent right?

[thin stratus]

Each of these having if needed matching PlayerState, GameState, PlayerController versions with same inheritance chain

[thin stratus]

GameMode doesn't persist

[faint eagle]

is it ok in general to send actor/component pointers/TWeakObjectPTrs and TSubclassOf of any types via RPC? I'm examining some profiling results in unreal insights right now and it seems that this kind of stuff has some considerable size so I wonder if one should avoid it in general 🤔

[thin stratus]

Actor and Component pointers just replicate as ints fwiw

WeakObj probably too

TSubclass could be a path string, not sure

[faint eagle]

hm 🤔

[twin juniper]

Can you help me understand what does this mean?

[thin stratus]

But those are the whole components and actors, not just a pointer to them or?

[faint eagle]

Those are TWeakObjectPtr

[twin juniper]

Okay. I did exactly that earlier. But it used to travel on server and then hang on client. But now it hangs on client for a sec or two and then travels cleanly. Thank you for your help.

[faint eagle]

from what I remember, what actually happens in seamless travel, when server travels first to transition map, a new game mode is created before original is destroyed. it then copies all actors that should be considered persistent (idr for sure but i guess those are player states and/or player controllers), then server travels to final map and somewhere here old game mode is destroyed and new one comes into play. It sounds reasonable if you think about a case when menu map has BP_GameMode_Menu and the actual game map has BP_GameMode_Game so it can require actually different game mode actors
WizardCell actually wrote a good article on that matter, you should check it out https://wizardcell.com/unreal/persistent-data/

[abstract pike]

Does anyone know where exactly in this spawn actor process (using the blueprint spawn actor node) the expose on spawn values are actually set on the actor?

I'm trying to use a value in my replication graph but it isn't there....

So it seems like AddNetworkActor is being called first but I can't see where those values would be assigned anyway 🤔

Bugger... I think I found it

Right after .....

RIP

Oh nevermind, that's pins not actual values

I'm lost 🤪

I found the code

Yea as you said after the spawn before the finish

Unfortunately rep graph add network actor is right away

hmm

I wonder if there is a FinishedSpawning event I could use or something

PostActorConstruction maybe

A shame that they have an end play event but not a begin play one

[twin juniper]

Woah. This is a really detailed guide. TY. I'll read it bit by bit.

[faint eagle]

What does exactly mean net events color in unreal insights? I mean I understand that red probably implies "bad", yellow is "cautious" and green is "good", but What is the exact rule that gives these categories? I mean do red events simply imply that out of all traffic these exact sources take more than 10% or 40% or 60%? Or is it more complex like "for an event of this type (replication, reliable/unreliable server/multicast rpc) in general such packages that are sent with this exact frequency should consume that much bandwidth?

[twin juniper]

Is this the right way to end the game? I'm not sure because if I server travel then the game mode changes, so does the end session and destroy session gets called or not?

[fathom aspen]

Good question, that I always asked myself, but never really got to look for the answer. I think if you use the widget reflector tool, to find which widget it is and then start looking based on how they are setting the color, then you'll have a clue. Sadly within the really short official doc they have, they don't mention the colors... but that page is under construction as it seems...

[faint eagle]

yeah I've thought about it myself today to just open insight's source code and just look for enums or anything like ::green, ::red, ::yellow. too bad i'm a lazyass

[ivory dagger]

hello everyone. im having some problem in understanding how multicast works in UE. what i know is that you multicast should only be called from the server. but im have this issue while calling a multicast event. i have this lobby menu, and when press one of these 'Hero xColor' buttons and it calls this event 'SpawnSelectedCharacter' on player controller.

what i want to do change skeletal mesh on all instances of the actor when i press any of those Hero buttons. but it only works correctly if i call the 'SetActorInfo' on the actor i want to change skeletal mesh on

if i call the 'setActorInfo' from the controller, it only changes the skeletal mesh on the instance of the game that calls the multicast event and on server

what i thought was both of these would work

but can someone please explain to me why 'setActorInfo' event being called on the controller does not work?

[twin juniper]

can someone pls help?

[twin juniper]

Do I need to call destroy sessions on clients from their player controllers? If so how do I get reference to their PCs since a NetMulicastRPC won't run from a GameMode because GameMode isn't replicated, right?

[faint eagle]

AFAIK - no, since clients neither create nor own the session. A lot of stuff with online subsystem sessions is actually handled by AGameSession. You can also check how epics do it in Lyra's common user plugin

[twin juniper]

I found this in the tutorial

[faint eagle]

Try looking into AGameSession source code, destroy session might be called in end play there

However I don't remember if game session exists in clients 🤔

[odd iron]

Hello guys , I have 2 questions I will be appreciate if i got an answer .
1- If i want to create a multiple servers each server have its own chunk ( part ) of a map . Can i Initilaize them in one huge map and players travel between them when they reach specific location ? From where should i start .
2- If I want to connect my game or server with database such as MongoDB which one is the fastest way .

• Websockets
• APIs
• Custom TCP tunnel ?
  Thanks in Advance

The server question already exists in a game called ATLAS the game .

[twin juniper]

I am able to destroy session in game mode on server but then the client losts connection and starts throwing error

[chrome bay]

Destroy session will kick clients yes.

The "session" is the engine-level wrapper for the online backend "session". If you destroy it, it terminates the session online too, which will kick any connected players

Game Session does exist on clients also.

[twin juniper]

The game ends after a time which is tracked in game mode. Because GM exists only on server how do I communicate to clients that game has ended. Using GameState? and from where should I call destroy session on clients?

[ivory dagger]

was this answer for me?

[ivory dagger]

in response to this?

[dark edge]

Controller only exists on your computer and the server

Your controller doesn't exist on my machine

You shouldn't be multicasting though. You're trying to sync state. Use repnotify.

[ivory dagger]

but im calling the event from server, shouldnt that solve the problem?

like game mode doesnt exist on my machine but i can still access it if im on server

[twin juniper]

I server travelled and then using GameState destroyed session on clients as well as on server.
The problem is when I create a new session on Server which is successful, then there is connection lost error on client again.

[dark edge]

@ivory dagger zero playercontrollers exist on all machines. A multicast inside a playercontroller makes no sense

Your selected asset should be a repnotify variable in PlayerState or the pawn itself

Someone pin this

[thin stratus]

It's pinned in form of the compendium. That should be enough

You can link to it directly

[meager spade]

can you use EOS in editor, or does it have to be packaged?

[twin juniper]

After destroying session on client, how to open another map on client?
Because if I use OpenLevel after destroying session, it works for server but not for client.
I was thinking of using UEngine::Browse which seems appropriate here, but is it the right way do it?

[quasi tide]

One of the selling points of EOS was that it was supposed to work in editor. Haven't tried myself though.

[quartz iris]

Why does the animation and sound effect play for the player who did the action once, then after trying to do the custom event again it doesnt?

The mind subvertion widget works on the enemy player even without the animations and sounds though

[oak prawn]

please help 😄

[ivory dagger]

im sorry if my questions are super dumb but does 'zero player controllers exist on all machines' mean that player controllers only exist on the server and one per each client. and why does multicast inside a player controller make no sense

[odd sundial]

Yes that's what that means

[faint eagle]

How do I come up with network budget for clients and listen servers? Or maybe somebody can suggest me an article on that matter. Like say I have a coop game with 4 players, I've profiled a couple of game sessions and I can tell that in 10 minutes the server sends 4MBs or ~7 KB/s per second on average. How do I understand if it is good or bad in my case? I mean I can tell by the insight's profile results that there are things that could be optimized but should I spend my time on it? Can I reliably derive approximate ping clients and listen server will have based on insights data? I mean I know that there are parameters like MaxClientInternet rate and speed and something like that for server that set the amount of bytes client/server can send ber second but I've also read somewhere that just kicking that value up can backfire with some other connection issues 🤔

[odd sundial]

At my wit's end here and I think I'm overlooking some basic concepts.

I have an Armory Component. It's attached to my Character. On BeginPlay(), the Armory Component receives which weapons to spawn from the GetOwner()'s GameInstance and then spawns which weapon is in the player's Game Instance.

This works just fine for the server. But the clients will always only spawn the server's version of the GetOwner()'s GameInstance versus the version of the Game Instance weapon that they chose prior to server travel where they chose their weapons.

What... what am I missing here. How do I have my client's Armory Component properly recognize which weapon they have selected from their GameInstance ?

[meager spade]

GameInstance exists once, in pie

there is not multiple copies

[twin juniper]

Using Browse doesn't work

[latent heart]

Does it not exist in the editor as a whole as well?

Like an editor copy and a PIE copy?

[meager spade]

yes

but its only 1 copy

there is no difference between local client copy iirc

[latent heart]

That might well be true!

[odd sundial]

Yep I understand that there is a Game Instance, only one, per each player- however as I understand it, despite not being replicated, the Game Instance exists on the server as well as the client.

However the Armory Component isn't accessing the player's Game Instance to determine which weapons to spawn, it's accessing the server's version of the GameInstance.

[meager spade]

there is one gameinstance

its not per player

[hollow eagle]

Every PIE instance has a game instance. Not per player, per pie.

[meager spade]

(in pie at least)

[latent heart]

You'd need to do the 'run in separate process' thing to get more GIs.

[meager spade]

^

[hollow eagle]

Err, no?

Every PIE instance has a game instance

the editor itself does not, but additional PIE windows (and, if enabled, the in-process dedicated server) do

separate game instances

/**
 * GameInstance: high-level manager object for an instance of the running game.
 * Spawned at game creation and not destroyed until game instance is shut down.
 * Running as a standalone game, there will be one of these.
 * Running in PIE (play-in-editor) will generate one of these per PIE instance.
 */

UCLASS(config=Game, transient, BlueprintType, Blueprintable)
class ENGINE_API UGameInstance : public UObject, public FExec

[hollow eagle]

What you just said is likely the problem - the server has one game instance. It does not have access to any client game instances, game instances are not replicated. You get one. Period.
Every PIE client gets one of their own. The server cannot access client game instances, clients cannot access the server game instance.

It doesn't matter how many clients connect to the server, from the server's point of view there is only one game instance. Game instances are not related to players, they are the representation of the local copy of the running game.

[odd sundial]

Understood.

Here's what is happening though.

On Server player if I choose, say, the Shotgun and spawn, both the server and the client will both spawn with shotgun.

if as a client I choose, say, the Assault Rifle, it doesn't matter - the client still spawns with whatever the Server happened to choose.

[hollow eagle]

Well, if you're storing the choice of item on the server's game instance then that's why

A client storing some data on their own game instance doesn't tell the server anything, and the server is what has to authoritatively spawn things.

[odd sundial]

When I make the choice and then review the choice on the client, the choice appears correct.

I think what's happening is I'm spawning with authority and it's thereby only spawning the server's choices

[hollow eagle]

Yes, that is what I'm saying.

Game instances are not replicated, they are not shared in any way.

[odd sundial]

The choice is set on the Game Instance, but then the Armory Component, prior to spawning, obtains that information from the game Instance. It then calls the spawn gadget method which is obviously done via authority with the server as an argument.

[hollow eagle]

Yes but the choice is set on which game instance

if you never replicate that choice to the server then the server can't know what you've chosen

[odd sundial]

The player's

[hollow eagle]

so you never tell the server

[odd sundial]

Gotcha...

[hollow eagle]

the server knows nothing about a client's game instance

it does not exist from the server's point of view

[odd sundial]

The server receives which weapon to spawn from the Armory Component, however... and the Armory Component gets its chosen weapons from the Game Instance.

The server and Game Instance never actually communicate directly - the Armory Component is replicated and that's how any spawning functionality occurs

[hollow eagle]

Ok but are you actually replicating the choice on the component

[odd sundial]

Okay I think this is the direction I needed

I think that's the link I was missing... I'm going to try to implement, thank you for your time

[latent heart]

Are you trying to replicate the weapon choice back to teh server via the armory component?

[odd sundial]

Yes

[latent heart]

Like with "Replicated" in the UPROPERTY?

[odd sundial]

I wasn't prior but that's my plan moving forward

[latent heart]

So you aren't sending an RPC?

[odd sundial]

I wasn't but that's what I plan to do

[latent heart]

(A "Server" UFUNCTION)

[odd sundial]

Prior the Armory Component was just getting the GameInstance's weapon choice in the Begin Play function

[latent heart]

Okay, so, "Replicated" only works 1-way. Server to client. Nothing you set on the client is "replicated" back to the server.

You can only send data via an RPC

[odd sundial]

Yeah my plan is to replicate the weapon choice for a Server RPC

[latent heart]

Okay. Just so we're clear.

[odd sundial]

Should I be calling this RPC during BeginPlay?

[latent heart]

Depends on the flow of your game.

But bear in mind the server will spawn your player and (if you have it set up as such) spawn your weapon before your client ever gets to beginplay.

[odd sundial]

Yeah that's now what I'm trying to wrap my head around

[latent heart]

You have 4 options:

• Somehow set the weapon you want on a previous map
• Send the weapon you want with the options string (blank giving you some sort of default weapon)
• Have the server spawn you with no weapon/default weapon and wait for you to rpc your choice
• Spawn in some sort of "observer" mode and the server will wait for your weapon choice

[odd sundial]

Thank you very much, very much appreciated

[unkempt tiger]

If I create an actor serverside and immediately send a reliable multicast through it to all clients, how likely are they to properly receive it (assuming it's relevant)?

[dark edge]

what you multicasting?

[chrome bay]

Hard to really say, but first thing to note is that only the Server should be marking things dirty. If the member property needs a reference to it's "owner" to work properly, I'd suggest setting it in the constructor of the class (and making it a transient UPROPERTY)

[twin juniper]

I have this strange bug where the online subsystem works fine for first time. I create session and then join it. destroy session on client and server successfully. No errors in log. Then On Client when I try to Find Session again, session search is created but Find Session Complete doesn't get triggered and it isn't even failing. It just gets stuck

[stoic acorn]

Morning all.
If I want to have an Doorway appear open or closed to ALL connected players (ideally they'd see the door animate open/closed even from the other side of the map). How would you go about achieving this?
My initial thought is that you'd use a repnotify and make it always relevant, but I'm just guessing at this point.

[chrome bay]

A rep notify is the way to achieve it certainly. If you wanted to see it all the way across the map, then always relevant is the simplest way to achieve that for sure.

[stoic acorn]

Ah thanks. Glad I was on the right track. I'm just never sure if there's a better way of doing things. I'll continue to bumble along.. cheers Jambax 😄

Oh. here's another related question actually. If it wasn't necessary to have a player see a door open in realtime BUT they would need to see the door in it's open/closed states when they turn the corner.
What would be the correct setup for that?

[chrome bay]

Well, it'd be hard to achieve in practice. Line-of-sight relevancy is much harder to do because a) it's expensive to compute and b) relevancy is too "laggy" to be as responsive as that.

You can only really achieve it in very controlled environments.

[stoic acorn]

ah. so there's no way to set a radius around an actor for network relevancy?

[chrome bay]

Well there is a radius, which is what Net Cull Distance is for - but there's no line-of-sight check, it's just a radius

[stoic acorn]

so if a character enters a region it would set all the 'states' of the actors

Ah gotcha

[chrome bay]

If you check bAlwaysRelevant, then it disables that radius check

[stoic acorn]

ok nice one, that's pretty clear to me now thanks

[upbeat basin]

Besides line of sight relevancy, is it possible to determine if a property replication occurs because the value is changed vs because it become relevant again?

Maybe checking the old value vs new value for OnRep functions in cpp?

[remote narwhal]

Hello, what is better, als or lyra? I found a custom version of als which is called ALSXT
I want to make an Arcade FPS/TPS

[thin stratus]

Lyra is a demo project. What's ALS again?

@remote narwhal

[limber gyro]

when u enable voice chat, does it come spatial or non spatial by default?

[fluid summit]

Hi! does anyone know if there's a way when replicating an array, to know only the element that got modified?

[thin stratus]

Yes and no. You'd need to use a FastArraySerializer (C++ only) for that

Otherwise, you could still do it with a normal array and pass the old version in to the OnRep (if you have one) and manually compare (I do that for something that is small and doesn't need replication often), but that still needs C++

[narrow prairie]

dumb replication problem, i have a struct with some variables. replicating correctly. the moment i use a map in the struct it wont replicate no matter what i try?

the map that is

the other variables remain replicated

been busy over a day, is it some weird issue that im unaware of with maps?

[latent heart]

Maps don't replicate

Or can't, rather.

[thin stratus]

TMap and TSet do not support replication, yus

[narrow prairie]

ugh

[limber gyro]

does any 1 have any good resources on ue4 voice chat stuff? im very confused and i cant find any proper documentation

[latent heart]

The solution is to do 2 arrays, one of keys and one of values. You loose your lookup powers, though.

You can recreate teh map on the client end when stuff is replicated, if you want.

[wind moat]

Hello, I am trying to start a deticated server in vs and its giving me the error code on-agnostic games on cooked platforms require a uproject file be specified.

anyone knowing how to fix?

[latent heart]

Have you tried specifying the project file on the command line?

Have you built a dedicated server using the UE5 project instead of your specific project?

[blazing spruce]

Hey, anyone know why clients dont hear this sound played? The sound gets called when the player interacts with the actor to pick it up, the server player hears it but client doesn't

[ivory bear]

In my FPS, I have an inhertid Fire event on my weapon bp. My character has a first person weapon and a third person weapon (for others to see). In multicast, I call the Fire events of both guns. The one for the 3rd person gun never fires/runs.
WeaponBase_3p>WeaponRifle_3p and WeaponBase_1p>WeaponRifle_1P
Other than a special material that handles zoom and prevents mesh "pass-thru" they are the same BP code
What might cause this to not get called?

Might be an inheritance issue as the Fire event runs in the base class for the 3P gun

[quartz iris]

How can I loop through all the players to see who is the winner and loser?

I have a variable for the winner and its set to playerstate atm

[ivory bear]

Fixed it. It was an inheritance issue.
Now it animates and shows a muzzle flash...but when it runs the fire rifle ironsite anim, it pops to center aim during animation...if you are aiming up 30 degres it shoots, but the recoil animation snaps the gun to level aim then back up. Aiming level looks great though. LOL Any ideas?

Here is what my fire animation is doing. Using the anim starter pack and ironsite fire (as a montage).

[dark edge]

do the aim offset after the montage player

assuming your aim offset is additive

[ivory bear]

Thanks. I will take a look. Had such an issue with a true fps, went back to arms and full mesh for others to see...and not easy either.

I am using raw anim starter pack so I havent done a true aimoffset for the ue4 mannequin for the full mesh ( I dont think)

[dark edge]

Yeah the animation setup for something like that is certainly not trivial, you need to understand your anim bp setup inside and out

[ivory bear]

...and I am a rookie (Unity convert). This is how my 3rd person mesh is rotating to handle look up and down that my first person arms do.

replicated look rotation

[dark edge]

So where is the montage player that's playing the fire animation?

before or after this?

[ivory bear]

Dont laugh at me, I am calling it in the weapon Fire event (from a tutorial I found)

[dark edge]

I mean where is the recieving end of that

in the anim BP

that's saying "play a montage"

where is the montage player used to calculate the final pose

[dark edge]

Show the rest of this

[ivory bear]

I call it from the Character

As for the anim bp, nothing there for it

This is the whole thing that Fire calls

[dark edge]

Show the whole pose graph in the anim bp

[ivory bear]

From the default Locomotion node...

[dark edge]

that's your montage player

put it before the aiming part

not after

[ivory bear]

ahh, ok. This is the montage set to Upperbody slot

like this, even though the fire montage is set to the upper body slot?

[dark edge]

Yes, the montage overwrites upper body bones

what you had been doing was adjusting the bones based on aim, then overwriting with the animation

now you'll animate, then adjust based on aim

wait

[ivory bear]

I ran the updated version and no change

[dark edge]

yeah, move the aim stuff to after slot upperbody

whole body doesn't get messed with

upper body is
Whole Body -> upper slot -> aim stuff

[ivory bear]

Gotcha!

Ill give that a whirl

[dark edge]

let's see it if it works

[ivory bear]

Works like a charm! You rock!

Does it make sense to have that montage call in the gun with the muzzle flash?

[dark edge]

Sure, that's a fairly normal way to do it.

[ivory bear]

Thanks again!!!

[blazing spruce]

I also tried changing them to just directly call the multicast event to play the sound but same thing happens, any ideas?

[dark edge]

Show the rest of the pickup logic

[blazing spruce]

Just some checks confirming the player can interact with the actor

[dark edge]

Are you intending that to be clientside or serverside?

[blazing spruce]

This is how my interaction gets called

so serverside right?

[dark edge]

You are already doing interaction serverside, why are you calling a run on server event inside it?

It should just be:

InteractEvent -> ??? -> multicast play audio

axe can play the audio

no need for character

assuming axe is a replicated actor

[blazing spruce]

I updated it too this but client still doesn't hear anything but server does

[dark edge]

What does On Axe Pickup do?

[blazing spruce]

So the way ive got it set up is that i have BP AxeSpawnLocation actors placed around the map which spawns the BP Throwing Axe Pickup actor which happens from the game mode at the start of the game

[blazing spruce]

Think ive figured out whats happening, in my Increment/Decrement event im destroying the axe actor when the player picks it up, even tho that happens after the sound is played it still must be destroying the actor for the client quicker than it can play the sound

[magic vessel]

When I seamless travel, do I need to override any functions on the components on the player controller to prevent them from being reset?

[fossil spoke]

You don't prevent them from being reset, you will usually want to pass on state.

Check these out

    /**
     * Called when seamless traveling and we are being replaced by the specified PC
     * clean up any persistent state (post process chains on LocalPlayers, for example)
     * (not called if PlayerController is the same for the from and to GameModes)
     */
    virtual void SeamlessTravelTo(class APlayerController* NewPC);

    /**
     * Called when seamless traveling and the specified PC is being replaced by this one
     * copy over data that should persist
     * (not called if PlayerController is the same for the from and to GameModes)
     */
    virtual void SeamlessTravelFrom(class APlayerController* OldPC);

    /** 
     * Called after this player controller has transitioned through seamless travel, but before that player is initialized
     * This is called both when a new player controller is created, and when it is maintained
     */
    virtual void PostSeamlessTravel();

These are in APlayerController

APlayerState::CopyProperties

APlayerState::OverrideWith

[magic vessel]

I have a component that holds the pawn class that I want the player to spawn in with, would I use these functions to handle this?

[fossil spoke]

Essentially yeah.

[magic vessel]

Okay, I'll give this a shot

Thanks

[fossil spoke]

You would probably use SeamlessTravelFrom to pass that variables value into the new PCs variable.

So effectively its "Copied" over.

Assuming the old PC is being replaced of course.

Which could happen if its a different type, because of a different gamemode or something.

[magic vessel]

That makes sense, I could just use GetComponentByClass to get the component and copy over the properties

[magic vessel]

That seems to have worked, I'm testing it with my custom EOS subsystem to ensure that it plays nicely

[near granite]

Niagara Fluid does not interact with the second collider tagged actor. So I chose to use global distance field in the niagara option. after that, it reacts with collision even with actors that do not have a collider tag attached. However, in multiplayer, there is a phenomenon in which the Niagara Fluid of the second user does not come out as the set speed and keeps coming out very slowly in a strange direction.

[narrow prairie]

@latent heart thx for comming back, i implemented it that way thx

[upbeat basin]

Does.. putting a map in a struct to replicate it not work on blueprints?

[thin stratus]

Maps can't be replicated

Neither can Sets

@upbeat basin

[upbeat basin]

Wait it doesn't work if I put it in a struct as well

I thought that was the workaround

[thin stratus]

No

[upbeat basin]

I don't know how I never came up on needing to replicate one

[thin stratus]

You cannot replicate a TMap or a TSet directly

[upbeat basin]

I guess I would need to create a pair struct and make an array out of it then?

[sinful tree]

You could get around it by creating a structure containing your key and value pair, and then making an array of it, populating it and replicating that instead.

[thin stratus]

The workaround is to make a struct that has the Key and the Value and to use an Array with that struct

[upbeat basin]

Got it, thanks

[odd iron]

Goodday guys I have a question,
If I want to separate a map into separated server instance each part.
Can I merge them in one big map ?

And make players travel between them seamlessly

[sinful tree]

Not using Unreal's native networking solution.

[odd iron]

Any ideas ?

[sinful tree]

You'd have to code your own networking system entirely. There's no way around it. Any time there is a transition to a new server, there will always be a hitch and at the very least a loading requirement of some kind. It's just how the engine works.

To facilitate moving seamlessly, you'd have to have your clients completely ignore Unreal's netcode and not really "connect" to a game server in the same way. Then you can have the client do whatever and it won't have to hitch/load. This means you'd have to facilitate replicating everything that Unreal does in your own unique method, like using TCP or UDP servers that your client could connect to send and receive the information that needs to be replicated.

[odd iron]

Thanks for explaining this ..
Then if we made the player loading can we at least init the maps letting them see it but when they enter the edge they will start loading ?

In default engine client code

[sinful tree]

Graphically you should be able to make any level look however you want, then it just boils down to where you put your overlap check to start the transition process of that player to the new server. Transitioning to another server would still be sudden and likely take a few seconds and you probably won't have a "seamless looking" transition as the original server would have to notify the other server of the player's location, control rotation, etc. and the receiving server would have to spawn the player and load all the data about them before allowing the player to be back in control and everything may not exactly line up with what the player was last seeing. I'm not sure as I haven't tried to do something like this myself.

[odd iron]

Yes me too havent try this i wanted to learn it good idea .
Also I will use MongoDB with websocket for data transaction so i will just transfer the player data easily by updating server ID " foregin key "

[covert igloo]

is there not a function to get netmode for BP.
i have some code that ive been working on for a while. and it runs great. but now i want to optimize it. and in doing so id like to handle single player a little differntly than multiplayer, and i cant find an easy way to detect what mode im running in

[upbeat basin]

I think IsStandalone should do it?

[lean sand]

Hi guys, is there any reason why this gives errors? Just trying to understand how to do "Blueprint Run On server option" in c++

    UFUNCTION(Server, Reliable, WithValidation) // in .h
    void Dash(const FInputActionValue& Value);

void ABaseClass::Dash_Implementation(const FInputActionValue& Value)  // in .cpp
{
    //code
}

[upbeat basin]

Do you have your _Validation Dash_Validate version of the function as well?

[twilit radish]

Like @ Layso also mentioned there are some BP nodes like "Is Standalone", "Is Server" etc. but the actual Netmode is not exposed directly to BP no.

[upbeat basin]

If you put WithValidation then you need to have _Validate as well, I don't know what error you're getting but maybe that's the reason

[lean sand]

ah I see, tbh I only copied this from UE doc, the only thing I know is the Server client multicast part, but even with just UFUNCTION(Server) it still gives error

[twilit radish]

What kind of error? Does it not actually compile or is it just a red squiggly line in your editor? 🙂

[upbeat basin]

I think Reliable is also required

Or was it required to specify whether it's Reliable or not

[twilit radish]

Reliable is not required, it can also be Unreliable. But it will need to be one of both (although there's also a default fallback I believe?).

[lean sand]

thanks guys, indeed one of these is required, it works now

[covert igloo]

that is unfortunate. but its what my research was yeilding.
will standalone at least tell me if im playing offline. and that will do what i need at least

[twilit radish]

Generally I had a difficult time doing this specifically in BP. To my knowledge these are the ones available:

From (https://docs.unrealengine.com/5.2/en-US/BlueprintAPI/Networking/)

[last storm]

Hello, I'm currently working with UE5 and i'm trying to Join a FOnlineSession.
But I need the session name in order to match the implementation:
virtual bool JoinSession(int32 LocaclUsserNum, FName SessionName, const FOnlineSessionSearchResult)
I might have misunderstood, where the "Session Name" = the "new user" session name ?

but it's weird

[twilit radish]

@last storm I would recommend looking at Cedric's article about it: https://cedric-neukirchen.net/docs/category/session-management
It has everything you would ever need for this in specific. There's also specifically a C++ part: https://cedric-neukirchen.net/docs/session-management/sessions-in-cpp

But I believe all you want to put there is NAME_GameSession like:

JoinSession(*localPlayer->GetPreferredUniqueNetId(), NAME_GameSession, SessionResult)

[last storm]

I'm gonna dig it all the day lol, thansk alot

[last storm]

yes but, how to get this "NAME_GameSession", since you can't get it from the "FOnlineSessionSearchResult" nor "FOnlineSession"

that's where I'm struggling

[twilit radish]

It's defined in a large enum with a bunch of other ones: https://docs.unrealengine.com/5.2/en-US/API/Runtime/Core/UObject/EName/
But I don't think you have to specifically include the header for it if that's what you're asking for 🙂

[last storm]

thanks a lot

[lean sand]

Hi, also wondering about this, do I just put Dash_Validate(const FInputActionValue& Value) in .cpp? I've tried adding it in .cpp or adding it in both .h and .cpp but they both fails, I've also tried changing it to bool, not sure what the correct way is

[clever hound]

Seems like you are stuck in the basics. I suggest watching and understanding these
https://m.youtube.com/watch?v=UmJzuRO4Qjs
https://m.youtube.com/watch?v=JOJP0CvpB8w

[lean sand]

thanks, was following https://docs.unrealengine.com/5.2/en-US/networking-overview-for-unreal-engine/ but they didn't show the full code

[clever hound]

https://docs.unrealengine.com/5.0/en-US/multiplayer-programming-quick-start-for-unreal-engine/
This is C++

[lean sand]

thanks, didn't know they separate bp and c++ tutorial, will look at that😋

[limber gyro]

if(GetLocalRole() != ROLE_AutonomousProxy) this check works fine if i am running on a dedicated server, but with sessions the client that is runnign the server still passes the check, whats the best way to make the client playing on the server not pass the check as well?

[kindred widget]

Need more info. What is this actor?

[limber gyro]

a character

basicly im trying to spawn a blood effect everytime the hp changes

it works fine unless the player is the server

[kindred widget]

Makes sense. Server player is authority.

What is the blood effect? Chances are the call is probably already tossed on dedicated servers if that is your only concern.

[limber gyro]

its a niagara effect

so is there a way to check for players that are the server?

and blockign that?

[kindred widget]

You don't want the server player to see the blood? O.o

[limber gyro]

i want him to see the blood on the other players

i dont want him to see his own blood

cause thats just visual cluter

[kindred widget]

Then just == Simulated Proxy probably I think.

[limber gyro]

i think i tested that before but i will do it agian

[kindred widget]

Well. No, that won't really work for that on server. They're all authority.

[limber gyro]

doesnt work

ye

thats what happened

just tested it

[kindred widget]

Could just do an IsLocallyControlled check.

Or actually

Better yet, spawn the system regardless. And set it to OwnerNoSee = true.

[limber gyro]

i tried that but i dont think it worked

i will try agian

[kindred widget]

It needs to be attached to the pawn the player is currently viewing.

[limber gyro]

ye its not attached

UNiagaraComponent* a = UNiagaraFunctionLibrary::SpawnSystemAtLocation(GetWorld(), bloodParticles, GetActorLocation());

im gonna try the IsLocallyControlled

[kindred widget]

Why don't you want stationary blood to show for the local player? O.o

I could see if it was an annoying effect you didn't want the player to see when playing in fps mode, but not seeing their own blood spots is odd when it's stationary.

[limber gyro]

because in an fps it might block the view if ur looking down

[kindred widget]

Stop getting shot? 😂

[limber gyro]

LOL

[kindred widget]

Could always material it too. Opacity by range.

[limber gyro]

is locally controlled is not working

[twilit radish]

I would just go with the IsLocallyControlled check, it's a character, also saves you from having to spawn a particle system that doesn't do anything on a client that can't see it anyway 😛

[kindred widget]

They could see it though. It's stationary. They should be able to see it when they move away.

[limber gyro]

the Islocallycontrolled check doesnt work when the client shoots the server

wait

i might be doing somethign unescessary

[kindred widget]

Imo this isn't really a networking issue as much as a designer issue. Dedicated server is the only place it shouldn't exist and it already gates creating particles internally. I would just make an opacity by distance to camera and set it just outside of the range of normal camera view. Bit more normal to still be able to see it when you're moving away, but it isn't in the player's face at any time.

[limber gyro]

nvm its working

so it was the IsLocallyControlled() function that i was missing

thanks

[burnt coral]

So how do I fix animation movement on multiplayer??

When I walk Left or Right my character just walks forward and slides left or right, which is due to me not having an animation, but in multiplayer the walking forward just loops the first frame constantly.. Is this cause there no animation or do I need to do more then just set the player replicate true in the bp?

Need info please if anyone can help

[halcyon totem]

if im using seamless travel on a deciated server do I need to bring over my player starts and weapon pikcs up? how does that work, does it do it automatically?

[worthy wasp]

I thought BeginPlay() ran as both Server & Client? Is there some other form of AuthMode checking I need to do in C++? I've tried:

HasAuthority()
GetLocalRole() == ROLE_Authority

Neither work :/

[dark edge]

What indication do you have that BeginPlay isn't being called?

[worthy wasp]

i never said it wasnt being called - sorry i implied that its not running as Authority with the 2 checks there.... hence the question of if i'm checking the right check?

[dark edge]

The beginplay on the serverside version of the actor should be authority, show your code for how you're testing.

[worthy wasp]

if(HasAuthority())
{
   blah();
}

Never hit

same said for GetLocalRole() == ROLE_Authority

its my assumption i'm not doing the right IF logic check there

i'm trying to save an RPC - i can do it if need but ... but i thought that BeginPlay ran AsServer - which would allow me to do some preliminary setting of replicated variables right off the bat.

[dark edge]

BeginPlay runs everywhere the object exists

[worthy wasp]

https://tenor.com/view/code-purpose-of-life-matrix-gif-5601363

i'll read between the lines i guess :/

fwiw - removing the if branching shows a netmode of CLIENT - i was expecting both CLIENT & SERVER

[quartz iris]

How do I play a widget on the respective player who lost/won the round?

or is it like this?

[graceful viper]

Is ReplicatedUsing uncommon practice or something? haven't heard of it once until I started looking at GAS, nowhere in the replication docs

[latent heart]

Very common.

[dark edge]

What actor is this and how are you spawning it?

[gritty lantern]

Do UFUNCTION(Exec) functions only run on the server? Is there a way to get it to run on the client?

[latent heart]

They will run on whichever instance it is called on

[coarse gale]

Does anybody know anything about this, got it to build the server, but the strange thing is that the instructions said to do it from the projects VS project (which didnt work), but when I build it from engine source VS project by building just the game project that is listed in that, then it builds but gives this error when running it ,Tempted to just wipe and start fresh with a new project tbh because it seems there may be some config issue.

[tepid sable]

What functions / events are triggered when a multiplayer client leaves the game (either by quitting the session, or hitting Alt+F4) ?
We're working on a bug that only occurs when a client crashes. If they disconnect "safely" (either Alt+F4 or using the UI to quit), the bug does not occur. If they crash (we added a button that can crash the client, to make this easy to test), the bug occurs.

[grim hill]

Hey, im trying to make a local multiplayer system in ue4. when i create the player both keyboard and controller inputs posses the same character. any fixes. im using ue5 and the create local player

[sinful tree]

There is OnLogout in the GameMode. It could also be EndPlay on your character or player controller.

[thin stratus]

There should be a setting somewhere saying Skip Assigning Controller to Player 1 or so

Either in the play settings or project settings I assume

Could also be editor preferences. Been a while since I had to use that

[grim hill]

I already have the boxed checked

[coarse gale]

ok figured it out... I guess a skipped the package project step and just tried to launch the compiled server... oopps

[halcyon totem]

am I suppose to add or click something to actors when using seamless travel?

I need to mark actors for seamless travel but I dont know how

[sinful tree]

There's some C++ code further down that looks like it's how you handle adding actors to the persistent list.

[pine sage]

Hi, would you have any lead Regarding this jitter in my aim offset ?

Using lyra stuff, and trying to find the root cause

Anim blueprint, character, controller and some network settings have been ruled out

Any lead or test cases would be appreciated!

[halcyon totem]

@sinful tree is there anyway to do this in blueprints? how can I find GenericPlayerInitialization and HandleSeamlessTravelPlayer?https://docs.unrealengine.com/4.26/en-US/API/Runtime/Engine/GameFramework/AGameModeBase/GenericPlayerInitialization/

[steep mica]

if someone were to use hacks in my game, would they be able to send an RPC to the server with whatever arguments they want?

[small grail]

Then you need the validation on the server side. They may send, but how it is accepted is up to you (Server)

[steep mica]

lets say I wanted to make a game like cod and I use RPCs to purchase a weapon

Would it be a good idea to just run the interaction line trace on the server and do whatever needs to be in via a multicast?? From my basic understanding this should stop any cheaters from being able to just do like GetWeapon(RayGun) without having to hardcode a billion things

From the way I see it if I don't do that I have to do a billion checks to see if the wallbuy exists on the map, and if it doesnt is the mystery box open, and is the user in question opening the box, and if it is what weapon

1st method sounds really good but idk exactly if its fool proof, would a hacker be able to call multicasts? Or basically impossible

[small grail]

No, they can't. It is only on server side.

But if they installed something backdoor on your server, then...

[steep mica]

so in this case would first method be "fool proof"? Just do a check to make sure that the client in question sending the interact actually owns the player?

[small grail]

Ok, lets say all the in game currency is stored on server. And the client just get the replicated number from server. If they hacked the game and modified it to, for i.e 1 trillion, then when they request RPC running on server to buy a very expensive equipment. You'd definitely check the currency on server for his profile instead of just because he sent enough currency by the RPC request. Something like that.

[steep mica]

well in the first case the server would be doing the interact function completely, so it wouldn't have access to any fake gained points

[small grail]

Yeah, I mean it is just an instance. Or like client side says I hit the enemy by tracing, but you need to validate on server that if he has some abnormal or definitely not regular movement/behavior, you could refuse to accept hitting and etc.

[steep mica]

How would I even check if a client owns a player in an RPC to the server?

Oh actually I think I answered that myself

Actually, is validation called on the client or the server?

makes more sense to be on the server actually 😅

[halcyon totem]

I keep getting UActorChannel::ProcessBunch: SerializeNewActor failed to find/spawn actor. Actor: None, Channel: 42 for actors like player starts on my dedicated server ofr SEAMLESS TRAVEL, do I need to mark things to let the server know to bring them over?

[steep mica]

so yeah not sure on the actual solution on how I could verify the client actually owns said player

[sinful tree]

In order for a client to communicate to the server an RPC must be sent by a client. Just creating an RPC function itself is opening up a door to allow someone to call that RPC at any time, even if you don't have any code anywhere that actually calls the function, the fact is, the RPC exists and is waiting for the signal to be received. Adding inputs into the RPC add an additional level of "insecurity" as you're then allowing someone to feed data into the server.

So, if you're wanting to allow someone to buy a weapon of some kind, your best bet is usually to call an RPC and send the absolutely minimal amount of data possible to allow the purchase of that weapon.
So if the identification of the particular weapon to buy is being done by an actor reference, your RPC then can include the reference to the actor you're trying to buy. If you're wanting to limit how far away a player is from that actor, then when your RPC is received by the server you should validate if the player is within the desired range of the actor they're attempting to buy. If they are, then you can deduct the currency from the player and have them "buy" the weapon (whatever that entails).

[sinful tree]

Probably not. I haven't done anything with Seamless travel and persisting actors, but I do know there's a lot of multiplayer stuff that is only accessible VIA C++.

[dark edge]

That smells like locomotion blend space 180 / -180 things

show your locomotion blend space

[halcyon totem]

@sinful tree it seems like my player starts are falling to spawn on seamless travel, should they be place on the map or spawned in with code in the level blueprint

[atomic wing]

Am I going insane? Testing a scenario where client 1 damages client 2, but the on rep notify calls on client 1. And then I'm getting the progress bar set on the client doing the damage

[restive current]

Hey all! Does anyone have any GOOD resources for multiplayer / replication (Other than Unreal Docs) that can help to make more sense of multiplayer? Any help is very much appreciated.

[sinful tree]

Likely because your "Hud Reference" isn't directly related to the character receiving the damage?

[atomic wing]

Maybe I'm daft, but it's a widget reacted on begin play, and they're not replicated -- Shit that's called for everything I feel dumb.

[sinful tree]

Check the pins on this channel. Lots of non-Unreal docs related information pertaining to multiplayer.

[restive current]

Thank you so much

[atomic wing]

Thanks BTW, 100% a rubber duck moment

[steep mica]

im confused, does the engine automatically provide this I don't see it being setup anywhere (GAS example project)

[hollow eagle]

APawn has OnRep_PlayerState, yes

[steep mica]

lifesaver

[crisp wraith]

Hmm, any way to replicate TOptional<bool> or do I have to roll my own implementation?

[thin stratus]

I think you need your own

[crisp wraith]

thanks

[twilit radish]

There's a neat method from Epic to optionally serialize values. It uses a single bit to indicate whether or not the value is valid, if it's not valid then all it ever sends is that single bit over the network. If it's valid it serializes your value + that single bit to indicate it's valid. See:
https://docs.unrealengine.com/5.1/en-US/API/Runtime/Engine/Engine/SerializeOptionalValue/

And as an example of it being used somewhere (assuming you have Github access):
https://github.com/EpicGames/UnrealEngine/blob/release/Engine/Source/Runtime/Engine/Private/Components/CharacterMovementComponent.cpp#L9071

@crisp wraith ^

[crisp wraith]

sweet, will check it out
thanks

[floral elbow]

What’s the best way to access the current player controllings state on a bp?

[boreal wadi]

Has anyone profiled while playing as a client and can explain why the client has 2 world ticks in a frame essentially doubling frame time in multiplayer

[wind moat]

Hello, I just created a deticated server, on the default ports and ip, but when I try to sstart a client, a client is starting in standalone mode, its not connecting to the server, anyone knowing what I am doing wrong?

[twilit radish]

There are a couple of ways. It depends from where you want to get, a couple of examples are these:

Which I took from here: https://wizardcell.com/unreal/multiplayer-tips-and-tricks/#2-beware-of-getplayerxxx0-static-functions
It's a neat article if you're interested ^^

[floral elbow]

Thanks, I was looping over get all actors and checking if it was itself lol

these seem better

[twilit radish]

On what exactly is this based? The engine simply runs as often as it can or as it's allowed per second. If it were to tick twice per frame then that would be a MASSIVE performance issue and I kind of doubt that's the case honestly 😅

[twilit radish]

How are you connecting? There could definitely be several problems here. Some things to check:

• Can the device your client is running on ping the actual server where you're hosting the dedicated server?
• At what exact part does your logic refuse to work? (Attach a debugger or just print some messages to the console).
• Any errors / warnings in your logs?
  🙂

[wind moat]

I am connecting to a local server for now, means I am connceting with the IP 127.0.0.1 i am doing this per CMD command, the server is starting, its telling me session started n all, trzing to connect a client to it via the cmd command, nothing happens, a instance is started localy, without even attempting to connect to the server
No errors, and i am just outputting the logs to a cmd window

[coarse gale]

if its localhost that rules out any connection problems, what command are you using, out of interest

[wind moat]

in the folder where i build the client,inside of cmd: GameClient.exe 127.0.0.1 -WINDOWED -ResY=800 -ResX=450

[twilit radish]

Just to make sure, you checked both the client and server log right? Not just one of both? 😄

[boreal wadi]

Essentially in one frame there are 2 world ticks each with similar calls my guess is one is sent and the other is received. Only guessing this because when playing as standalone there is only one UWorld tick in a single frame. In my client session each world tick is taking 4ms plus shit like slate tick and random stuff for landscape. This is playing as a single client with some mass entities running around in editor. Haven’t tried a compiled build yet.

[coarse gale]

I have not connected that way yet, I have been using loadlevel (which might be worth try) so I am not sure about this, but all the examples I seen had -game after the ip, not sure if that is required or not

[wind moat]

lemme try it out

[wind moat]

what do you exactly mean with loadlevel?

[coarse gale]

open level, sry

[wind moat]

I am connecting through cmd tho..

[coarse gale]

I know, and its not working

https://docs.unrealengine.com/4.26/en-US/InteractiveExperiences/Networking/HowTo/DedicatedServers/

try connecting like this and see if it works

[wind moat]

Did it, still not working, 2 seperate instances

imma try n recook everything i guess

[pine sage]

Hi ! Thanks for helping

is that what you were looking for ?

What I don't understand is: this is Lyra stuff. It works well in lyra. I just migrated the C++ classes and some of the assets from lyra (for instance those anim bp etc) and I have the issue

[pine sage]

Understand that

it has been hard to make it work well at first but in the end, everything is working as Lyra intended to, except for this ...

I wanted to be able to understand those dependencies and see for myself what was working or not, and deal with it, to get a better understanding of the Lyra framework

[pine sage]

basically rather that just use something: learn from something

[rose pollen]

looking at github it seems like Iris isn't being actively worked on much anymore, was looking through @fathom aspen wonderful information here: https://wizardcell.com/unreal/multiplayer-tips-and-tricks/ and wondering if we're still expecting iris to replace the replication graph

[quasi tide]

I doubt they're just going to be dropping work on Iris.

It's just something that takes time.

[latent heart]

They might just be focusing on 5.3 atm.

[clear island]

maybe something they'll combine with the push model

even about the push model there isn't many people that know about it and its a bit old at this point

[quartz iris]

This is on the gamestate btw

If anyone could help ❤️

[latent heart]

How do you tell the players which player won?

Use an OnRep on that.

[quartz iris]

Which variable?

[latent heart]

⬆️

[quartz iris]

So I can't multicast the variables and the rpc for the widget on the player

[latent heart]

You generally don't want to use multicast unless there's a reason to specifically use multicast over regular replication.

[quartz iris]

This is how the game starts

So this two are correct?

[latent heart]

Sure.

Use an OnRep on the gamewinner variable.

In that onrep, check if game winner == me

If so, display the widget.

[quartz iris]

is this with a loop?

[latent heart]

No

What would you do in that loop?

[quartz iris]

check all players

check if player is in the variable of winner

[latent heart]

Why do you need to check all players? You already know who "me" is.

It's the person receiving the OnRep.

[quartz iris]

I need the player character not the playerstate

[latent heart]

You should be using the player state.

[quartz iris]

Ok

So I put the winning widget etc in the playerstate?

and call with an rpc

[latent heart]

No

No

Just ignore everything I've said, I'm just confusing things.

And I don't have time to explain!

[quartz iris]

Ok

Dm me if you can

Later sometime

I mean i'd pay you if you can explain what i'm doing wrong with the multiplayer on my code

I can't even begin to say how many times i've been stuck

[dark edge]

No

Learn how repnotify works

Then in the onrep for WinningPlayer (a PlayerState variable in GameState), check if the local players PlayerState = WinningPlayer. If so, show the you won widget.

To reiterate:
Server:
Someone wins -> set WinningPlayer

EVERYWHERE:
OnRep_WinningPlayer -> if local player = WinningPlayer -> show widget

It's that simple

[naive wind]

I'm making a VR game and want to make interactions as responsive as possible whilst keeping parity and syncrhonization. What would be the best way to go about picking up an item and notifying every other connected client that it has been picked up?

Not asking for anything complex- just some psuedo code. My current setup is

PickupClient
{
if authority: PickupMulticast
if remote: PickupServer
}

PickupServer
{
PickupMulticast
}

PickupMultiCast
{
AttachItem to motion controller
}

the thing i fear about this setup is that if you have a latent connection, picking items up will feel delayed and sloppy- i would prefer picking items up to be instantaneous on the client

[thin stratus]

@naive wind Having an Item picked up and attached is State. That should not be done via Multicast.

[twilit radish]

This indeed will be latency depended. It kind of simply depends on how far you want to go with making it feel smooth I suppose. One thing I would like to point out is that you really shouldn't use a multicast for the "this person has picked up this thing" state. If either a new person joins or the current actor associated with that player becomes irrelevant and after some time relevant again it will be out of sync. For things considered "state" like in this case I would absolutely recommend replicated properties 🙂

The most easy solution is what you described above yeah. If you want to predict clients being able to pick up items you could consider "locking" the item until the server verified that whatever they picked up actually belongs to them. (Preventing duplicating items / cheating in general). Which could for example look in pseudo code like:

PickupItemClient
{
if server -> SetPickupOwner(the server)
if client -> PredictItemPickup
}

SetPickupOwner(TheNewOwner)
{
CurrentOwner = TheNewOwner // The replicated variable / "state" I was talking about to prevent new people joining getting desynced etc.
}

PredictItemPickup
{
LockItemForThisClient // E.g. make sure they can't "use" it (if a gun don't allow to fire for example) or let go of it again.
SendServerPickupRequest
}

SendServerPickupRequest
{
bHasClientAcquiredOwnership = false;
if NotAlreadyOwned -> 
  {
    SetPickupOwner(whoever called the RPC)
    bHasClientAcquiredOwnership = true;
  }

RespondToClientPickupRequest(bHasClientAcquiredOwnership) // If true "unlock" the item, else remove prediction as clearly something failed and the client didn't ACTUALLY receive ownership!
}

This is simply what my mind quickly came up with. Again, it might have issues or whatever and is generally more work but that's up to you to decide what fits or not ^^

[thin stratus]

There are a lot of edge cases with this

E.g. what happens if two clients pick it up at the same time

It's sadly not so easy :D

The easiest solution is to just have it ServerAuth, but that's of course not snappy

[naive wind]

thanks for the help guys.... like you said there are a lot of edge cases.

[twilit radish]

That's why I suggested "locking" the item and sending back a response with if the ownership was actually given yes or no. But I didn't say it was "easy" 😛

[naive wind]

gotta decide if i want to bite the latency bullet and have an easy time

which, shouldnt be TOO big of a deal i hope

[thin stratus]

I know, but they said they don't need anything complex :P

I recently had to deal with predicted attachment. It's a pain

[naive wind]

who knows, it may even be better to punish latent players to drive them away lol

[twilit radish]

That's why it's a suggestion. If it's too complex, don't use it. I did suggest it however because latency like that is VERY noticeable in Virtual Reality programs. But yeah.. It can definitely be a pain, but IMO kind of a must have with VR because again it's extremely weird to "pick up" something with your actual hands right in front of your face and the nothing happening.

But again.. Totally depends on their game etc. xD

[naive wind]

anyways thanks again guys

[thin stratus]

I should probably have pinged Ryguy directly. The "not easy" etc.stuff was not directed at you, Thom

[twilit radish]

Oh no worries, I was just clarifying just in case 😄

[thin stratus]

We actually ended dropping the "feature" (was an ability) completely, as it was causing too many issues

There were so many edge cases that happened during actual gameplay, where packages were dropped, or multiple things happened so closely to each other that predicting actually also needed reconciliation etc.

[round ginkgo]

Hi, I'm trying to use Rider with an expression to find out what client or server I am

however I keep getting UnrealEditor-Engine.dll not found.

the project is source build and I find the dll and pdb in Engine\Binaries\Win64

I tried {,,UnrealEditor-Engine.dll}GPlayInEditorContextString and {,,UnrealEditor-Engine.dll}::GPlayInEditorContextString

anyone able to help here? would help me immensely for debugging

[hollow eagle]

it's just {,,UnrealEditor-Engine}, remove the .dll

and you do need the ::

[round ginkgo]

@hollow eagle still getting this sadly

[hollow eagle]

are you on UE5 or UE4

[round ginkgo]

5

using debug editor configuration

is there some other setting / step I should do that you're aware of to find the module? @hollow eagle

I'm not sure if I need to have rider configured in a way?

[quartz iris]

Yeah but this doesn't work for the clients, only the server

[round ginkgo]

^ re my issue

it seems like GPlayInEditorContextString + NetDriver; ServerConnection reproduce valid values only on debug when starting up the editor, but then fail afterwards
the pie session ingame says these values are invalid or when putting a breakpoint with the editor open in UUnrealEdEngine::tick

anyone any idea why it doesnt work ?

[dusky pecan]

why this variable does not replicating?

actor is replicated

[polar patio]

Replicating a variable on tick? Bold move. Is the actor set to replicate?

[quasi tide]

Do not do a reliable RPC on tick.

[trim plume]

Hi. I have this in a repnotify, which is based on a bool, however it won't set on the clients, only the server..
I have the bool getter variable connected to the SetSimulatePhysics node, but for testing I unplugged it again.
Only server got it false, all clients still have it enabled. I am really puzzled about this. Any help is greatly appreciated.
Sincerely, Matias

[halcyon totem]

when using seamless travel my actors placed o n the map arent making it over

is there a list I am suppose to add them to?

@thin stratus Im confused how do I mark my player start to persist into the new level? Any Actors further added via 'AGameMode::GetSeamlessTravelActorList'

how do I add actiors to the list?

[fathom aspen]

The persistent data compendium has an example

[pale edge]

hi, sorry to be a bit annoying with this question but im really struggling to get online sessions to work with online subsystem steam. Is there a full tutorial somewhere? ive followed about a million but i swear i cant get it to work for the life of me.

[fossil spoke]

Try the #online-subsystems channel.

[halcyon totem]

@tranquil vine I checked but it doesnt have any example, I need to know how to mark actors

in blueprints not c++

]

[tranquil vine]

i dont think u meant to tag me but no worries

[fossil spoke]

You cant, its C++ only.

[fathom aspen]

Only if you searched the webpage for the function name you posted earlier, you would have passed by: https://wizardcell.com/unreal/persistent-data/#5-getseamlesstravelactorlist

And yeah BP is so effing limited in terms of networking https://wizardcell.com/unreal/multiplayer-tips-and-tricks/#3-be-aware-that-blueprint-only-multiplayer-is-limited, so you can only dream about doing this in BP...

[dark edge]

Don't get player state 0

That is not the local players PlayerState

[dark edge]

That's the first PlayerState (probably the server/host if listen server)

[umbral barn]

hello, i need some help with a replication

can some1 join feedback and supp channel?

[wind moat]

Hello, i´ve set up a Deticated server, the server starts up fine, but i cant connect to it, no matter what I do

[latent heart]

And the logs say what?

[blissful talon]

Hello, does anyone know how to know whether local machine has internet connection, and how to get the connection/disconnection events?

[wind moat]

that the sessions started and is on Port 7777

[twilit radish]

"A way" to do it is to occasionally send some requests over the internet. Maybe try and see if you can ping google's server, cloudflare etc. you could also rent a server of your own that you can ping along with those. Then if too many requests fail within a certain given time you can reasonably assume that the internet connection is unavailable.

There is supposedly also platform depended ways to do this, iOS and android as an example should have them but I'm not quite sure if Unreal provides anything for that in specific 😅

Regardless of that. Internet availibility is unreliable and can change on a per request basis. If it's for an indicator you can use something along the lines of what I just mentioned. But don't ever assume that because your previous request worked the next one will too 😛

[blissful talon]

Thank you for a reply. Yeah, apparently that is the only way, which is kind of weird. I would imagine that it's possible to get that information from the OS. 😦

[twilit radish]

Some platforms do support that. I don't exactly know how they implement it in general though. But that's not standardized and may not be available on all platforms or publicly exposed on all platforms.

But again, I'm not sure if Unreal even has anything for that in specific.