multiplayer

[dark edge]

Is Player array not ordered?

[thin stratus]

Nope

[dark edge]

fun

[thin stratus]

It's locally maintained

But I'm sure if one spawns a Character with a Replicated Index it should be valid on BeginPlay

[queen escarp]

hmm

[thin stratus]

So just having a Replicated Index variable and setting that when the Character is being spawned (manual spawn via override), should be enough to tell the UI which of the 4 widgets teh Character belongs to

But that index is annoying to maintain. Cause if someone leaves, e.g. 3 players connect, player 0 leaves, the 2 others will still be 1 and 2

And the next player that joins needs slot 0 and not 3

[queen escarp]

exactly

maybe an array is better

[thin stratus]

But that is also solvable with a bit of brain

[queen escarp]

and remove index on leave etc ?

istead

[dark edge]

I want to knwo why the hell Player array is not replicated and is instead locally maintained

There's so much goofy stuff like that in the engine lol

[thin stratus]

You could make a fixed 4 size array, just in the GameMode to remember who has what index, and when someone leaves you remove the entry without shrinking it

And when needing to know the new index you just take the first empty slot

There are a bunch of ways to do this

[queen escarp]

aye

hm so question, casting to game mode as listen server works obvi server --> server but casting from client to game mode and getting a reff dont work

right or am i just ?

[thin stratus]

At this point it's kinda funny that this question still comes up

You have been told how this works a gazillion times

[queen escarp]

yupp but struggling with it obviously

[thin stratus]

GameMode is Server-only

That's all there is to it

You can't get it on the Client

No matter what you do

[queen escarp]

yeah so in no way a client can change something on the game mode then really `?

absolutley no way

[thin stratus]

At least in regards to directly accessing it

You can of course RPC to the Server and then let the Server change something

[queen escarp]

aye

[thin stratus]

But there is no way to directly access the GameMode as a Client since you simply don't have an instance of it

[velvet jacinth]

I can't understand if there's an issue here.
I've set some display names on the inventory widget to identify each player inventory.
The inventoryOwner is the GetOwner from the inventory component ref that the widget has.
I'm on pawn possess by the player controller, I'm spawning and possessing with an AI controller a player character. I need that functionality.

Currently, dropping an item from the client will drop at the server location and vice versa.

[queen escarp]

hmm okey

so.. hmm ok

aye im not sure how im gonna do this :/

ok firslty

what would i use insated to get an index for the player ?

since this one is only local

[thin stratus]

I would use Character::BeginPlay for all of this

[thin stratus]

So in other words, you are unsure why the OwningPlayerPawn is a different one than the InventoryOwner?

I can't quite follow

[queen escarp]

wdym Character thats what im using the player character ?

or do u mean the parent class

of my class*

[thin stratus]

I mean I would use the BeginPlay method of my Character class

[queen escarp]

yeah but this is for the "update part only" not assign part

[thin stratus]

wdym update?

[queen escarp]

however i can just change that tho i just thought it was better to keep things seperated

this part is inside the "hero Widget" so its doing all updaing functions in the widget BP

and from the player im only asigning from what character it should get the info from

that was my idea nevertheless

[thin stratus]

If that's in the Widget

Then that's redundant

Cause the BeginPlay of the individual Character

Will set itself to the matching Widget

And then you can use that Ref to Update the Widget, bind to update delegates etc.

[queen escarp]

hmm

it will set the owner of the widget u mean?

[thin stratus]

No?

[queen escarp]

nevermind ill remove all the updating functions inside thje widget and do it all from the character since that seems to be better'

[thin stratus]

The Owner of the Widget is the local player

That's besides the point

[thin stratus]

You don't need to

And that is actually worse

You'll need to formulate your questions better if you struggle with any of the directions Adriel and me provided you with

[queen escarp]

yeah i think thats the issue

ok so to breake it down simple

[thin stratus]

How about we start with "How do I get one of the Characters of my 4 Player Game assigned to one of the Widgets in a local Player's HUD?"

And we leave the updating for after that

[queen escarp]

ok sure

[thin stratus]

So one question I have upfront: The 4 Widgets in your UI, are they always there, or do you only add them when a Player joins?

[queen escarp]

the game is a Max 5 player game the 4x player Ui widget wont be yourself only the other players * and yes will only be visible if there is a player in that slot

they are preplaced added in the UI hud basicly

[thin stratus]

So you actively hide them somewhere?

[queen escarp]

im going to set visible/colapse" was my idea

yeah

[thin stratus]

Okay, let's assume, for the sake of simplicity that:

• The Widgets are set to COLLAPSED by default
• The Order of the Character and Widgets is currently not needed to be in sync with everyone

[queen escarp]

yepp

[thin stratus]

Okay, so you are interested in a Character being Valid and Assignable on all Clients.
The GameMode's PostLogin is only giving you a valid PlayerController, and only on the Server, so let's forget about that for now.

[velvet jacinth]

I'm trying to understand if there's any problem with the owners.
It's really confusing to see the same actors as owners on client and server.

[queen escarp]

ok

the player state then maybe * ?

game state*

[thin stratus]

Keep in mind that _1 at the end is not indicating "same actor"

They receive that _X based on order they get created it.

[velvet jacinth]

Yea that I know. But the others are the same player controller and character

[thin stratus]

No, if you need something to be Valid, your best bet is to use that something directly.

[thin stratus]

PlayerController is local, so that will always be _0 and the Client can't have the Servers there

@queen escarp So we use the Character directly. The Event to know, on everyone, that a Character is valid and ready, is BeginPlay

[queen escarp]

ok

[thin stratus]

The first Player is the Server, so that's a bit boring of an example, and since you only want to list other players, we ignore this scenario for a second

Let's imagine a second player joins and a Character is spawned

For the ListenServer, BeginPlay of the Client's Character will call

[queen escarp]

yepp

[thin stratus]

For the Client, BeginPlay of its own Character, as well as BeginPlay of the Server's Character will call

So at this point we have a good notifier for when a Character is valid. We do have a problem though, since you want to only show the other Players, because we would need to somehow filter the ones that are local.

And on BeginPlay, we don't actually know that yet, cause the Character might not be possessed yet.

[queen escarp]

ok

[thin stratus]

In C++ we would have an easy time now, cause we could use OnRep_PlayerState in combination with PossessedBy.

We don't have access to OnRep_PlayerState in BPs

Let me quickly think about what the best alternative is

[queen escarp]

sure

[thin stratus]

Nasty, freaking BPs

[queen escarp]

imagaine you being a n00b alsop

[thin stratus]

I guess you could make a custom PlayerState variable that you mark OnRep and piggy back of that

[queen escarp]

ok

should i just do a Bool and call is "Onrep" and mark for replicate right

[thin stratus]

Something like this essentially

Don't have a better idea atm

[queen escarp]

hm ok and that should be in the character bp ?

[thin stratus]

Yeah

[queen escarp]

since thats what were checking

[bright fern]

Hi all,
I'm working on a metaverse based on pixelstreaming and I wondering if someone ever try to run multiple instance of a game on a single server with multiple GPU?

[thin stratus]

Forgot to rename it

[queen escarp]

ok

[thin stratus]

In the OnRep you can then do something like this

Theoretically that should work

Still a bit unsure

[queen escarp]

ok but the SET w/Notify is from where what ?

[thin stratus]

Disgusting that we can't have OnRep_PlayerState in BPs

[queen escarp]

i already have a custom player state

[thin stratus]

wdym

It's a Variable in the Character with the type of PlayerState

Custom is only cause you can't name it PlayerState

I wonder if that IsLocallyControlled can still fail there hmm

[queen escarp]

i mean

i can name it player state * ?

[thin stratus]

Yeah but that's confusing

[queen escarp]

aye ok

the casting to player controller

in my case i should cast to "player character" instead right ?

arent we checking if the character is valid not the controller

i mean its the same but ?

[thin stratus]

What?

[queen escarp]

https://blueprintue.com/blueprint/a463n_sa/

or ?

[thin stratus]

Yeah sure, I would never put the HUD into the Character

[queen escarp]

yeah thats what i mean

thats what i did * 😉

[thin stratus]

Mine sits in the PlayerController

Okay

[queen escarp]

yeah figured

[thin stratus]

So from there on

I made some quick widgets

Assumption is:

• HUD Widget with a VerticalBox (VBox_HeroWidgets)
• Hero Widget with a Character Variable

Hero Widget with this Function

That what we will use to set the CHaracter

On IsValid you can also start getting values and binding to Delegates for updating later

The HUD received two functions

Adding and Removing a Character

All they do is go over the Vertical Box Children (your Hero Widgets)

And call Set Character on it

"Add" finds the first empty one and the stops (break)
"Remove" finds the matching one and stops (break)

Ah typo in the function name

Remove not Renove of course

Updated version

[velvet jacinth]

@thin stratus I really can't understand that problem.
It feels like my owner/player controller are switched.
The server drops the item at the client location, and the client drops the item att the server location.
In the inventory component drop item function uses GetOwner to get the actor location.

[thin stratus]

@queen escarp

And then in the OnRep you added you can use those two to add and remove the characters

That's all there is to it

Haven't tested it though

[queen escarp]

ok gimme a few mins setting it up

[thin stratus]

There might be more involved here. You should print the Pointers at multiple places to check where it flips them

Also you never said who's inventory you are looking at

Does each player only look at their own inventory?

[velvet jacinth]

Well from the pictures I've sent it looks right.
Moving items in the inventory of each one seems to work ok.

[thin stratus]

print it

Like, the debugging process is something you gotta do

I can't do that for you :D

[velvet jacinth]

printing the owner in the drop item function prints server: _1 and client: _1
Looks like the same character but it's not ?

[thin stratus]

Again, _1 doesn't mean anything

If you need to know who is who, try getting the PlayerState and printing the PlayerName for example

[velvet jacinth]

Yea the PlayerState -> GetPlayerName prints 2 different names.
So I guess the problem is the ownership of the component.
Although I just added this actor component to each BP character

[queen escarp]

hm alright its all set up

nothings happening tho but

hm the ONrep isent fiering even

@thin stratus

ok so the on rep is fering

but im getting errors on the Add/remove

[thin stratus]

Yeah cause you have your HUD in the Character

Which isn't guaranteed to be valid

I would move it to the PlayerController

[queen escarp]

oh right since im creating the widget after the possesing is happening`?

ok so the error went away but nothins really happening

hmm so its removing but its not adding i ont think

[queen escarp]

@thin stratus

[thin stratus]

Can you breakpoint the functions and see where it fails?

Cause I didn't test it

[queen escarp]

ok s

https://blueprintue.com/blueprint/_g79wws9/

when testing as listen server and 1x client i get

Server:Add
Server:Remove

when only 2x clients test

i get nothing

so something there

if i bypass is locally controlled it fires on clients also but alot of errors

[thin stratus]

The BP UE shows that you inverted the IsLocallyControlled

That needs to be connected to FALSE

Cause you wanto only call this on other player's character

[queen escarp]

oh¨

the top one is unrelated

so its accessing none

the casting is not failing

hmm

[nocturne quail]

is this not enough on a chaos vehicle to move on clients?

even this doesn't solved the issue

its mean something else is broken in chaos vehicle component

fixed:
if anyone has this issue, just enable this FPBDRigidsSolver::SetIsDeterministic(1);

[hoary spear]

Your're using several references there. Which one exactly, is failing

[near fiber]

I'm facing a character and pawn interaction issue in my game. I have a character and a boat pawn. The goal is for the character to control and navigate the boat, which has a FloatingPawnMovement component. I've set up an RPC call for the possession, and the camera transition indicates it's working. The boat's movement is also handled by an RPC call using the "Add Movement Input" function. Everything seems to work when the listen server player controls the boat, but client players can possess without being able to move it. I feel I might be missing something basic. Using UE 5.3 and blueprints. Any insights?

[viscid tapir]

Hello ! Does anyone know why PostReplicatedAdd() is getting called 2 times when i'm client ?

// In my add function that triggers this unexpected behavior
Items.Add(ItemInstance);
MarkItemDirty(ItemInstance);
OnItemInstanceAdded(ItemInstance, EvaluatedPrice, ItemInstance.Index);

// Implementation of OnItemInstanceAdded (still incomplete I guess)
void FItemContainer::OnItemInstanceAdded(FItemInstance& Instance, int32 RealPrice, int32 Slot)
{
    Owner->OnItemAdded(Instance.Handle, RealPrice, Slot);
}

FFastArraySerializer stuff

everything works but I don't understand why I see 2 paths in PostReplicatedAdd() when I debug it

[queen escarp]

@hoary spear as player character

[thin stratus]

I already said:

You should move your UI into the PlayerController.

Because:

Having it in the Character adds yet another replicated Actor into the List of required References.

And:

You can't guarantee that the Character of the Local Player exists yet when this calls. The Accessed None is expected.

You'll solve the issue if you move the UI/Widget into the PlayerController.

If you just ignore this suggestion over and over again, then sure nothing will change...

[queen escarp]

Yeah i got it the issue im using the player hud ref all over the whole game basicly :/

[willow surge]

@thin stratus don’t want to take to much of your time as it seems you’re giving lessons in here now, but any chance you know where this error might come from?

[2023.10.08-14.23.28:844][324]LogNetTraffic: Error: UActorChannel::ProcessBunch: New actor channel received non-open packet. bOpen: 0, bClose: 0, bReliable: 0, bPartial: 0, bPartialInitial: 0, bPartialFinal: 0, ChName: Actor, ChIndex: 11, Closing: 0, OpenedLocally: 0, OpenAcked: 1, NetGUID: 0 [2023.10.08-14.23.28:961][333]LogNetTraffic: Error: UActorChannel::ProcessBunch: New actor channel received non-open packet. bOpen: 0, bClose: 0, bReliable: 0, bPartial: 0, bPartialInitial: 0, bPartialFinal: 0, ChName: Actor, ChIndex: 11, Closing: 0, OpenedLocally: 0, OpenAcked: 1, NetGUID: 0 I can not find any information about this error at all.

[thin stratus]

Yeah well

I'm not going to give you work around solutions for your previously set up bad code :D
It's already tricky enough to set this up in BPs

[thin stratus]

That message comes from UActorChannel::ReceiveBunch

Bunch being "a bunch of data".

The UActorChannel handles the Actor. If it receives Bunch and there is no Actor yet, it will initialize everything

And the very first check for that is if Bunch.IsOpen

[queen escarp]

Hmmm why would it. Be better in the controller rather then the character ?

[thin stratus]

• PlayerController is valid earlier
• PlayerController remains valid even if the Character gets destroyed
• PlayerController is more "Local". In C++ you could even use the ULocalPlayer.

It's just generally the more logical place

At least for the generic HUD that most games have

@willow surge

    // ------------------------------------------------------------
    // Initialize client if first time through.
    // ------------------------------------------------------------
    bool bSpawnedNewActor = false;    // If this turns to true, we know an actor was spawned (rather than found)
    if( Actor == NULL )
    {
        if( !Bunch.bOpen )
        {
            // This absolutely shouldn't happen anymore, since we no longer process packets until channel is fully open early on
            UE_LOG(LogNetTraffic, Error, TEXT( "UActorChannel::ProcessBunch: New actor channel received non-open packet. bOpen: %i, bClose: %i, bReliable: %i, bPartial: %i, bPartialInitial: %i, bPartialFinal: %i, ChName: %s, ChIndex: %i, Closing: %i, OpenedLocally: %i, OpenAcked: %i, NetGUID: %s" ), (int)Bunch.bOpen, (int)Bunch.bClose, (int)Bunch.bReliable, (int)Bunch.bPartial, (int)Bunch.bPartialInitial, (int)Bunch.bPartialFinal, *ChName.ToString(), ChIndex, (int)Closing, (int)OpenedLocally, (int)OpenAcked, *ActorNetGUID.ToString() );
            return;
        }

Seems like you are doing something to your Actor before its channel is fully open

[willow surge]

Thanks, Im not doing much / anything breaking that I’m aware of. It’s just the Lyra Game Sample with EOS enabled and PlayFab for the dedicated server. I’ll get on this. Thanks for pointing me in the right direction.

[near fiber]

In my UE 5.3 game, I'm having an issue where a character should control a boat pawn with FloatingPawnMovement. While an RPC call handles possession (think it work beacuse of the camera transition) and another manages movement using "Add Movement Input", only the listen server player can fully control the boat. Client players can possess but not move it. I'm probably overlooking something basic? Any advice? I've been googling for 2 days and not sure what I'm doing wrong

[thin stratus]

You might be overlooking the fact that UE has no proper Multiplayer Movement code for anything but Characters.

Your Pawn Movement is probably not replicated at all, since the MovementComponents for Pawns don't have anything proper set up.

Only the CharacterMovementComponent does

FloatingPawnMovement (I only just registered that you listed it) probably has no Multiplayer capability.

Yeah it's not doing any networking :P

In UE, if you don't have a Character with a CharacterMovementComponent for something Player-Controlled, you have a bad time

Unless you know your sh`t and can code it in C++ yourself

[near fiber]

I try to move the boat on tick and that replicates, I check Has Authority and on authority call the add movement input and it moves on both, but that's probably not it? If I use CharacterMovementComponent and call a server RPC to move it on server it should replicate ?

[thin stratus]

CharacterMovementComponent doesn't need additional RPCs

It has an RPC ServerMove that handles all the stuff in the CMC

There is a lot more than just telling the Server to move

If you just do that you have input lag

[thin stratus]

For Authority it might move on both because the Actor itself has ReplicateMovement applied

You can of course just tell the Server to move, but it's by faaaar not enough

[queen escarp]

but eXi- question, is the "on rep function" only server called something something ?

[fallow kettle]

Hey guys!! Am new to multiplayer systems.. so apologies if this is a stupid one...
So basically I am trying to spawn 2 controllers which would possess a pawn each... so am using the game mode to spawn them...

My question is... if its possible to remove the controller that spawns by default and spawn them using a loop coz the problem am facing is that if I try to destroy the initial controller on post login or anywhere... the screen goes black... I tried spawning a controller but didnt work... some suggestions would be great

Thanks

[queen escarp]

and also the player hud is valid 100% that cant be the problem :/&

[near fiber]

I'll check what I can figure out, thank you!

[thin stratus]

OnRep calls, in Blueprints, for Everyone

[thin stratus]

I will not repeat myself over and over :P

[thin stratus]

You should not Destroy or Create PlayerControllers by hand

(+- local Splitscreen ones)

[fallow kettle]

So... if the default controller is on index 0... and I wanted 2 additional controllers... should I simply use the postlogin to spawn them??

Also if thats the case... I have seen alot of the other devs using a custom container to store the refs to those PCs... my query is... whats the point of having the "Get Player Controller" node with an index as an input

I initially thought that there is some sort of containers already made on the engine to deal with them

[thin stratus]

Why would you manually create those?

[willow surge]

^ single player only ?

[thin stratus]

You can select to start the Game with 2+ Players in the Editor

And in a Real Scenario it would be players joining

Unless there is something about your setup/game that you aren't sharing yet

[fallow kettle]

Coz I want a split screen view

[thin stratus]

So not online at all?

[fallow kettle]

Yes you are right

[thin stratus]

The Array that some devs do, which is arguably strange, is for Online

Cause there the GetPlayerController node is less useful

For LocalSplitscreen you can use that Node, yes

And for creating additional players, you can use the "CreatePlayer" node

"Where" is up to your game logic

[fallow kettle]

Aaah!!! That makes sense... actually my end goal is to set everything up in the server but atm am just playing with all these stuffs so that I have a clear idea how these things are working

[thin stratus]

"The Server", if you have no Online Play, then this is not really a term to use

Splitscreen doesn't have any Client/Server stuff

Everything is in one and the same game

[fallow kettle]

My goal is to make a multiplayer game... so I am exploring how things work on different modes

I havent touched the online part just yet

[thin stratus]

Right, but then it's still favorable to make sure the terms are correct

And no, you would not create the PlayerControllers in PostLogin then

Usually, if you bring Splitscreen Players into an Online/LAN game, you first create those in the MainMenu

And then have the Main PlayerController join a game

It will tell the Server about the other local PlayerControllers.

[fallow kettle]

Yeah... I just realised that... coz when a player connects to the server they would come with their own version of their controllers which I simply would add to a data container to store the refs... thats how am thinking right now😂😂

[thin stratus]

Yeah the PostLogin would call for all players who join

That's a bit late to suddenly add local players

[fallow kettle]

I just got confused with understanding the diff between using the player controller node and having a custom container

[fallow kettle]

But thanks alot mate

[thin stratus]

There is no Array of PlayerControllers by default. If that is your question

The Array is also not really needed. Most of the time the Server doesn't directly iterate PlayerControllers. And if they do, it's mostly via GetAllActorsOfClass.
It's really rare that you need to iterate them

That's one of the rare cases where that Node is actually fine

[fallow kettle]

All these makes sense now!!

[thin stratus]

I mean.. that's also not true I guess. There is a LocalPlayer Array on the GameInstance

Which is the one that the GetPlayerController node uses

If it can't find anyone with that, it actually uses the PlayerArray (PlayerStates Array) of the GameState

[fallow kettle]

Will eventually find out as I work more on this

[thin stratus]

It's tricky to learn this without touching C++ I guess

class APlayerController* UGameplayStatics::GetPlayerController(const UObject* WorldContextObject, int32 PlayerIndex) 
{
    // The order for the player controller iterator is not consistent across map transfer/etc so we don't want to use that index
    // 99% of the time people pass in index 0 and want the primary local player controller
    // After we've finished iterating the local player controllers, iterate the GameState list to find remote ones in a consistent order

    UWorld* World = GEngine->GetWorldFromContextObject(WorldContextObject, EGetWorldErrorMode::LogAndReturnNull);

    if (!World)
    {
        return nullptr;
    }

    // Don't use the game instance if the passed in world isn't the primary active world
    UGameInstance* GameInstance = World->GetGameInstance();
    const bool bUseGameInstance = GameInstance && GameInstance->GetWorld() == World;

    int32 Index = 0;
    if (bUseGameInstance)
    {        
        const TArray<ULocalPlayer*>& LocalPlayers = GameInstance->GetLocalPlayers();
        for (ULocalPlayer* LocalPlayer : LocalPlayers)
        {
            // Only count local players with an actual PC as part of the indexing
            if (APlayerController* PC = LocalPlayer->PlayerController)
            {
                if (Index == PlayerIndex)
                {
                    return PC;
                }
                Index++;
            }
        }
    }

    // If we have a game state, use the consistent order there to pick up remote player controllers
    AGameStateBase* GameState = World->GetGameState();
    if (GameState)
    {
        for (APlayerState* PlayerState : GameState->PlayerArray)
        {
            // Ignore local player controllers we would have found in the previous pass
            APlayerController* PC = PlayerState ? PlayerState->GetPlayerController() : nullptr;
            if (PC && !(bUseGameInstance && PC->GetLocalPlayer()))
            {
                if (Index == PlayerIndex)
                {
                    return PC;
                }
                Index++;
            }
        }
    }

    // Fallback to the old behavior with a raw iterator, but only if we didn't find any potential player controllers with the other methods
    if (Index == 0)
    {
        for (FConstPlayerControllerIterator Iterator = World->GetPlayerControllerIterator(); Iterator; ++Iterator)
        {
            APlayerController* PlayerController = Iterator->Get();
            if (Index == PlayerIndex)
            {
                return PlayerController;
            }
            Index++;
        }
    }

    return nullptr;
}

This is the code behind the node

If you can read code, then this should be clear

The Server could theoretically use the node

To get PlayerControllers of other players

But not just via index 0, 1, 2, 3, etc.

Cause it will return local PlayerControllers first (e.g. Server having a Splitscreen friend)

But eventually it will try to find them via the GameState's PlayerArray

[velvet jacinth]

Hope someone here could reply and try to help with my problem here:
https://forums.unrealengine.com/t/replicating-player-character-rotation/1327505

[rocky kestrel]

What is good fix for network distance culling? I I set visibility (Example: Helmet) too far from other player and then walk to meet that he doesn't see it disabled. Should I make timer every 30 seconds and server event to update?

[candid mulch]

I copied this code into my custom cmc, and it says that it did not override a base function

[muted pewter]

Does Amazon Gamelift sdk support unreal engine 5.3.1 version?
Or what's the latest supported version of engine?

[thin stratus]

That's a Gamelift question. Better suited for their Discord/Forum

[zealous knoll]

Does somebody knows how to open this project at all?
https://github.com/BwdYeti/VectorWarUE4
I end up in a loop of rebuild it, maybe I dont know how to properly open it

[queen escarp]

@thin stratus Good morning, i did as you said and change the widget so its in the player controller now 🙂 so whenever you got time to continue helping me let me know (if u can)

still getting the same error*

[small grail]

How did you spawn them?

[humble edge]

This may help
https://youtu.be/IJtgKMQAxQs

[grave widget]

Can I replicate parameter declared in the interface?

[chrome bay]

Interfaces can't contain UPROPERTY so no

[wintry vector]

When I run net mode listen server with two players, one of the screens is just black, the other screen is fine. Anyone know why?

[queen escarp]

Hm my widget automaticly are being set to 1080x1920 in the editor when i open them (reversed) ??? why

even if i change and save*Ä

[upbeat geyser]

What is the correct way to tell the client to say the server what his location?

[unique forge]

Hi

um im having a problem with the camera shake

so when player 1 has the running shake effect,so do have the player 2 too but hes not running.

[gusty slate]

You don't need to use RPCs at all because if I remember correctly velocity is replicated

it's something that you run in the client which means you don't need any RPC call

[ocean laurel]

since you have the headbob running directly in Tick without a check for whether or not you are the local player, it's executing on every player character for all clients, so if one person is running, then all players will have the shake applied

put a branch with "is locally controlled" before your headbob

also idk if youre using it anywhere but delete that random custom event you dont need it

none of those events have to be networked at all btw

[gusty slate]

The exact reason just so you're careful in the future is you're executing the Headbob on the server and you're fetching GetPlayerController index 0

which means it'll always get the host/first player

[unique forge]

i mean like

when 1 player is running rn and he has the shake, no problem at all

but player 2 gets automatically the shake because player 1 is running

[gusty slate]

I answered ^ x)

[unique forge]

mb

any tipps? that u can help?

[ocean laurel]

do what he said and make sure all of the events aren't replicated at all so that it's purely running locally

[unique forge]

no replication alright

[gusty slate]

Just do a check on the headbob that it's a locally controlled pawn

ie a Client pawn

and remove the replication from the functions

[unique forge]

alright

ill try

[gusty slate]

And for the future, IF you need something like this replicated (idk why) but, if you do, you have to get the proper Controller

[unique forge]

not the local?

[ocean laurel]

if it were to be replicated then theres no guarantee that it would be the local controller so youd have to make sure it's actually getting the associated controller

[gusty slate]

Exactly

each pawn has a controller remember

if I remember GetController gets you the owning controller

[unique forge]

made into headblob not replicated

deleted the custom event

[unique forge]

nono i meant like

[unique forge]

like this

but player 2 has the same reason as 1

when player 2 is running

[unique forge]

player 1 gets too

[ocean laurel]

put that at the beginning of your headbob

[unique forge]

alright

now its like

[ocean laurel]

use your original branches as they were but have this as well before what you had

[unique forge]

when player 1 is running, the shake doesnt happen on player 1, only player 2

[ocean laurel]

undo what you did so that it's like you had originally after removing the replication, but then add the additional local player check before it

[unique forge]

now both players dont have the running shake, added on the 2nd branch the is locally controlled

[ocean laurel]

you dont want to add locally controlled to your existing branches, you want it to be a new addition before your existing logic

so that second branch there would be your first one in the headbob

but have the IsLocallyControlled before it

[unique forge]

like this?

mb the second locally

i deleted

[gusty slate]

you want to only execute your headbob code if it is a locally controlled Character

so you check if it's locally controlled

then you do your velocity checks/shakes

[unique forge]

on the 2nd branch?

[gusty slate]

yeah exactly like your code used to be before

Here's the thing

even the CameraShake shouldn't be networked

[unique forge]

ayeeee

it worked

ty

yea

added 3rd branch

[ocean laurel]

nice 👍

[unique forge]

thank you tho

[ocean laurel]

anytime

[manic token]

Can someone familiar with CMC clarify this for me:
There's a MaxSpeed in FSavedMove_Character, but Im guessing its not actually getting sent each tick, just used for accessing maybe? Is this true?
Thats why we should be making a bWantsToSprint and using a compressed flag for it so we actually have the max speed at the time of the saved move, right?

Is my understanding correct?

But is there not another way for sprinting? I understand needing to use a compressed flag for crouching, cuz of the collision changing, but for sprinting, could we not just do something like multiply the analog input vector that is being sent and is saving as part of each FSavedMove?

[ocean laurel]

now ideally you wouldnt use the start client camera shake youd just use the normal non-replicated shake lol but it works and that's what really matters atm

[ocean laurel]

swap to the legacy shake rather than the client shake to avoid any other potential issues

[unique forge]

alr, ty for the tip

[icy phoenix]

What's the correct way (if possible) to replicate a TArray of UObjects? I was able to replicate just UObjects by using AddReplicatedSubObject but the array doesn't work. For now I've defined IsSupportedForNetworking and GetLifetimeReplicatedProps for the UObject and I've set the array as replicated with DOREPLIFETIME_CONDITION(UStatsComponent, Modifiers, COND_OwnerOnly); in the actor component owning this array, but no luck.

[chrome bay]

Same as you would any other property

TArray<UWhatever*>```

If the array has a size but no objects, that means the objects themselves aren't replicating

Make sure you're using the parent Actor as the object outer, not the component

Not a huge issue, but the outer on clients is always the actor, never the comp

[icy phoenix]

ah that might be the problem maybe. How can I ensure I define the actor as the outer?

[chrome bay]

When you're creating them, just use GetOwner() as the object outer

IIRC you also need to opt-in to the replicated subobject list

[icy phoenix]

my component has bReplicateUsingRegisteredSubObjectList = true; set, which is also the reason why replicating simply UObjects works, I'm calling AddReplicatedSubObject(MyUObject); in the ReadyForReplication

my array of uobjects is defined like this:

UPROPERTY(ReplicatedUsing = OnRep_Modifiers, EditAnywhere, BlueprintReadWrite, Instanced, meta = (AllowPrivateAccess = "true"))
TArray<class UStatsModifier*> Modifiers;

and Modifiers is simply added to the GetLifetimeReplicatedProps of the component with DOREPLIFETIME_CONDITION(UStatsComponent, Modifiers, COND_OwnerOnly);

Modifiers for the purpose of my tests are added in game by a cube actor I created that when its collision sphere is overlapped it will add the modifier to the character's stats component

so if I understand corretly I should GetOwner() and set it to the object when creating the modifer in BP

[chrome bay]

Instanced will probably have issues I suspect, since you can't change the outer.

[icy phoenix]

I wanted to use Instanced because I'd like to manually define stats modifiers on the fly in the editor if I needed, but I can probably live without if it's problematic

[chrome bay]

Last time I tried it, it failed spectacularly because the objects couldn't resolve properly.

But that was a long time ago, I've no idea if it's changed since or if there's a solution

[icy phoenix]

doing this now gives me LogScript: Warning: UGameplayStatics::SpawnObject null outer (this logic is done on the server only)

and the modifier is effectively a nullptr it seems, I only added the IsValid condition now because it crashed the game

[chrome bay]

this is an actor right?

[icy phoenix]

actor component

[chrome bay]

It says target is 'Actor'

[icy phoenix]

oh apologies, yes it's my cube actor

[chrome bay]

yeah should be able to just remove it then, just use this as the outer

[icy phoenix]

so it should probably be the stats component's actor, not the cube

no, still not working. I can see the array replicating null items. I tried removing Instanced , but same issue

do I maybe need to call AddReplicatedSubObject on each array item?

[chrome bay]

You would do yeah

Each instance needs to be added to the list

[icy phoenix]

ok I think I managed to get it to work. Basically when I add the instanced modifier to the list I also call AddReplicatedSubObject(Modifier); right before the Modifiers.Add(Modifier);

so I expect I should call RemoveReplicatedSubObject on removal from the array or it'll keep sync a no longer used item

it's all working, thanks a lot @chrome bay !

[hoary spear]

Isnt the solution to manually Instance Uobjects , like lyra kinda?

[limber gyro]

in testing with players with low FPS i noticed that the character movement is choppy, likes its not being interpolated properly, is this intended? is there any way to fix it? any tips?

[real ridge]

guys I have this in my game state it is called when one of base is destroyed its calling event on all players in game , (second Photo) , print is always printing but my widget is not creating when I try it press K it is created

what can make issue?

[real ridge]

fixed

[gloomy axle]

ty, resolved the issue a while ago tho

[serene kestrel]

One thing you could try is increasing the NetworkMaxSmoothUpdateDistance to see if that helps (though this will only help with smoothing out the the translation movement not the rotation choppiness)

[unique forge]

just noticed, player 2 is kinda buggy

sometimes it works, then somehow dont work

[hoary spear]

Is this in a pawn?

So you can use "GetController" and GetCameraManager

@unique forge

[wanton cedar]

when would one want to use fast replication over normal replication?

[slate basin]

Haven't seen this option, is this for an array?

If so, https://ikrima.dev/ue4guide/networking/network-replication/fast-tarray-replication/

[slate basin]

Oh that, no idea

[queen escarp]

im working on my AI, its suppose to choose a random player wich way is preffered ?

[slate basin]

https://github.com/tranek/GASDocumentation

Search for fast replication on there, I think that explains it

Multiple GameplayTags can be stored in an FGameplayTagContainer. It is preferable to use a GameplayTagContainer over a TArray<FGameplayTag> since the GameplayTagContainers add some efficiency magic. While tags are standard FNames, they can be efficiently packed together in FGameplayTagContainers for replication if Fast Replication is enabled in the project settings. Fast Replication requires that the server and the clients have the same list of GameplayTags. This generally shouldn't be a problem so you should enable this option.

[queen escarp]

hm shouldent this pick a random :/ ?

[wanton cedar]

ooooh. that makes sense. so it packages them in cute lil arrays so it saves bandwidth

one of the UE dev talks on fortnites replication mentioned something about this i believe

[hoary spear]

Does it make sense to have a bpcallable function "BlueprintAuthorityOnly", while still checking if its the server internally? (and calling the respective rpc if not...)

feels like a double up..

UFUNCTION(BlueprintCallable, BlueprintAuthorityOnly, Category = "QuestSystem")
    void StartQuest(const TSoftObjectPtr<UQuestBase> Quest);

UFUNCTION(reliable, server, WithValidation)
    void Server_StartQuest(const TSoftObjectPtr<UQuestBase>& Quest);
    bool Server_StartQuest_Validate(const TSoftObjectPtr<UQuestBase>& Quest);
    void Server_StartQuest_Implementation(const TSoftObjectPtr<UQuestBase>& Quest);

While my testing was very limited, it seemed like no client can directly call StartQuest , and its simply ignored

[fluid prawn]

Question, Are Asynchronous Ability tasks replicatable? According to documentation "Ability Tasks are designed to be used in both networked and non-networked environments, although they do not directly update themselves across the network. They generally stay in sync indirectly, since they are created by Gameplay Abilities (which do replicate), and use replicated information, such as player input or networked variables, to determine their execution flow." I assume you can replicate the Async on client and server and then compare result for authority.

[serene kestrel]

It makes sense, but do Clients ever expect to be able to start a quest? If not, then why even have a need for the RPC? If yes, then why the BlueprintAuthorityOnly?

[hoary spear]

I feel like your latter two questions, invalidate the first statement about it making sense

Its exactly what i had in mind anyways, if they cant call it from client side, then internally checking if its client doesnt make much sense to me

unless there's cases where they would be allowed anyway, because reasons unknown to me

[unkempt current]

I recently tried to do some physical animation in a multiplayer project and noticed that the animation is out of sync between the server and client. Is there something I can do, plugins, resources, changing settings etc. or is the replication for physics just unreliable and I would have to rework the physics system?

[hoary spear]

I guess if c++ code try to call it, it makes sense to block it, but then i wouldnt need the rpc anyway. Just toss away if its ever client trying to start a quest

[serene kestrel]

Right, this is why it could make sense if you're exposing some other way for client blueprints to start quests you may still want to call this at the c++ layer

[hoary spear]

Gotcha. This is gonna be the only way for it to start, so .. I'll keep the bp authority flag there, as it makes it clear for the user

did the same thing, altho cosmetic, for the replicated data ment for clients

Initially I expected this to purely be a 'flair' to the node, and not actually have any behavioural effect what so ever 😛

[serene kestrel]

I'm curious how the TSoftObjectPtr for the quest objects work, are you always just sending CDO's in the RPC's? Or are you replicating down the Objects somehow? In that case you could just pass in a normal UObject pointer no?

Sorry I was thinking of WeakObjectPtr, makes sense to be Soft if you're wanting to avoid the load

[hoary spear]

It very likely could just be a regular pointer ,

setup similar to Lyra's inventory, with fragments and definitions etc

[hoary spear]

the load is probably tiny tho. Atleast so far there's no real assets involved

[pastel fiber]

If we set bReplicates property of an actor to true, which data members of the actor are replicated?

[hoary spear]

The ones marked for replication

The bool is just if the actor should even be considered for replication

[winged vault]

I have this niagara system and a multicast event

    UPROPERTY(Replicated)
    UNiagaraComponent* NiagaraComp = nullptr;

    UFUNCTION(NetMulticast, Reliable)
    void RPCSpawnTrail(UNiagaraSystem* Trail, FVector start, FVector end);

but the system only spawns on the server irrespective of who is spawning it either it be the client or server.

I am calling it as such

        if (StaticData->Trail) 
        {
            if (InOwner->HasAuthority())
            {
                FVector start = ItemActor->MeshComponent->GetSocketLocation(FName(TEXT("Start")));
                FVector end = ItemActor->MeshComponent->GetSocketLocation(FName(TEXT("End")));

                RPCSpawnTrail(StaticData->Trail, start, end);
            }
        }

[fossil spoke]

@winged vault Is the Actor/Component marked to Replicate?

[winged vault]

its aUObject class that is stored as such in an actor

    UPROPERTY(ReplicatedUsing = OnRep_ItemInstance)
    UInventoryItemInstance* ItemInstance = nullptr;

And that actor is replicated

[fossil spoke]

UObjects arent replicated and cannot send RPCs...

Please read the Network Compendium.

Its pinned in this channel.

Its a helpful resource for understanding Replication and RPCs.

[winged vault]

I did read that. but I can't figure what to do with this

[fossil spoke]

You would be better off replicating a Struct instead, that represents the "Item".

It needs to be replicated on an Actor

You would also then need a NetOwningConnection Actor to send RPCs

[hushed rain]

Is there a way to turn replication on and fire it once on command for a component in a BP?

[true olive]

Does anyone know how to replicate Camera pitch? I'm using the General Movement Component plugin and all of the mouse input is done through the movement component.

[fossil spoke]

What exactly are you trying to do?

[hushed rain]

Basically have a BP actor use as little net/processing as possible while being able to be turned on by players for 1 event

i think setting it to dormant all and then flushing it before using works though, not sure

[short arrow]

That should work. But I'm pretty sure dormancy is bugged for blueprints, it'll update regardless of whether you call force net update or not

Unless they fixed it for UE5

But it was marked as a bug on the site and marked "won't fix" aswell

[hushed rain]

Hmmm, so it's dormant and turns on/off by itself?

[short arrow]

So idk if it makes dormancy less reliable

[hushed rain]

based on changes

[short arrow]

Yeah, but again it's been a few years. Not sure if they backtracked and fixed it

[hushed rain]

interesting, yeah i thought i saw the changes happen even without flushing it. Hopefully it isn't awake but printing dormantl ol

[fossil spoke]

Yes dormancy is how you would handle this.

[small grail]

I'm not sure if it is executed separately on different client (suspected that), means you've got different random points there. The way to solve this is getting the points on the server and replicated it to the client, with On_Rep for the TArray you used for the random position then spawn them.

[pseudo kernel]

Would it be "out of convention" to prepend non-rpc methods that should only get called in a certain place with Server and Client?

I find it sometimes hard to know where (I as the programmer) have guaranteed that a method will run

[silent valley]

Actually we tend to do that quite a lot, can be useful in complex systems.
Having a convention to always display that information in the same way in the comment can also be useful.

[pseudo kernel]

I find myself really wanting to do something to those kinds of methods

[hoary spear]

In bp theres the nice BlueprintAuthorityOnly or BlueprintCosmetic ufunction specifiers, for blueprintcallable functions

[pseudo kernel]

I'll keep that in mind as I start doing BP networking, currently in C++

[hoary spear]

Like these ones

Doesnt help to much for the c++ side of things tho

[velvet jacinth]

This method works perfectly when creating a new project using Epic's templates.
Pressing B shows one widget for each player.
In my project it only fire on the client side, and for the server it doesn't call the ClientWidgetTest.
I can't understand what could be the problem here, there's no error or warning on the output log.

[hoary spear]

Im confused

Server rpc?

[velvet jacinth]

Sorry, when pressing B from the server in game the run on owning client doesn't fire

[dark parcel]

why do you need to call server to open a widget?

using button press nonetheless

[velvet jacinth]

The button press is for debug and test.
I want to understand and learn how to display a widget locally for each player.

[dark parcel]

just display locally then? No need for any RPC

Press B -> Show Widget

not like Widget can be replicated

[velvet jacinth]

I saw on YouTube that this is the method. 🤔 very confusing.
You're right

https://youtu.be/2GYicrkCElA?si=zyHhCfHNv2Zb1fBi
He showed here that this is how you can do it

So let's say I want to display that widget locally when overlapping and actor.
I understand that it's a bit different from calling like I did.
How can I achieve that? I have an actor with overlaping event working right now

Casting the overlapped actor and calling this function works.
But is there another way maybe adding that widget straight from the collision actor himself ?

[dark parcel]

Is the overlap detected on server side or locally?

if it's unimportant gameplay element and widget can be shown w/o any check then just detect the overlap locally and show the widget to the owner of the pawn

the way you would do it is the same as you would do it in Single Player

[velvet jacinth]

This would show for both the client and the server.
The actor is Replicated

[dark parcel]

because the overlap happend on every single machine

do a branch that check if the overlapping actor is what the machine posses

or maybe just run an event that create the widget in the controller the overlapping actor posses

[pseudo kernel]

If the RPC is being called from server to be executed on a client, only the client who actually owns that Actor will execute the function.

When it says "client who owns the actor" is it talking specifically about the class who implements the RPC itself? What happens if I say, have a reference to a player controlled pawn and want to call an RPC to that client from a server-controlled actor?

[velvet jacinth]

Well, worked as expected. Thank you very much for your help! @dark parcel

[sinful tree]

It's talking about the owning client of the actor. An example would be a player possessed pawn - the server when possessing that pawn would set the owner of the pawn to the client who owns the player controller possessing it.

Whenever you're running a Client RPC, it can only ever execute properly when called from the server and will only execute on the client that owns that actor. If there is no client owner, it won't execute. So if you have a reference to a player controlled pawn and are running on the server, calling a Client RPC on that pawn, then the code will execute on the owning client of that pawn's side only.

If you want other clients to execute it, you either have to multicast from the server (all clients will execute it), modify a replicated w/ notify variable (OnRep) which can then trigger a function when the value changes on a client (which again, can end up firing on all clients) or if you want something to execute only on a specific client, you need to run a client RPC on an actor that that client owns.

[pseudo kernel]

This is really helpful, thanks.

So In my current case I have a client player use some object, the object has it's "can I be used" logic happen on the server. In the case where it can't be used, I'm trying to show a message to that specific player, and was trying to use a client RPC on the object.

I guess I assumed it would use the owner of the pawn I passed the function, but I see that's not the case

So I guess for that pattern to happen, I would need to call the client rpc from an actor component or something. Assuming there's no way to call it given their pawn from somewhere else

I see a decent way to achieve this with my current setup, but just want to be sure that there's no way to have a client RPC get called on an actor owned by the server, even if I have say a reference to an actor (like the player's character) which is owned by the client I want to target?

[hoary spear]

Correct

Well, you can have the server owned actor invoke a client rpc on the client owned actor

[pseudo kernel]

Cool, I have everything going though some interaction interface that gets used via an actor component on the player.

I guess I'll move the logic so that the actor component does all the server/client switching and just calls the established methods on the item.

If I avoid doing it on the item, I should be only on the client actor and it should work as I expect

[woven barn]

guys i have a dedicated server/gameplay ability system question. is this the right channel?

[hoary spear]

#gameplay-ability-system probably

[woven barn]

thanks

[upbeat geyser]

How to give client owning an actor authority over replication?

[hoary spear]

huh ?

SetOwner , if you want to grant ownership to another actor

[upbeat geyser]

For example client is owner of a car, I dont want the server to correct him but vice versa

[hoary spear]

you want the client to have the authority , in a multiplayer game ?

or to dictate the cars location to the server (and thus other clients)?

[upbeat geyser]

this one yes

[hoary spear]

cheaters are welcome then i guess

[upbeat geyser]

Game is not competitive so it isn't a concern so much

[tardy fossil]

there is a setting in either the pawn class or the movement controller class that allows for client authorative movement, can't recall it off the top of my head though

[candid shuttle]

My packaged games are somehow unable to find other steam sessions, creating one works perfect and the steam accountData is even fetched correctly. Any idea where I could start looking for, as I haven't changed the session creation/finding Blueprint Scripts since it worked the first time?

Should I rather ask this in #online-subsystems ?

[glad escarp]

Hello folks. My simple interaction system works like this:
*I run a LookAt sphere trace on a TimerByFunction
*When it finds something that implements the BPI_Interaction interface, it sets that as the CurrentLookAtActor
*When the player pressed the "Interact" key, it checks for the validity of the CurrentLookAtActor (in case the player has looked away) and then sends the "Interact" message to that actor, via the interface.
*The "Interact" message gives the interactible actor a reference to the player character, gets an actor inventory component then calls a SERVER RPC.
*The RPC calls a function that checks for an empty slot and adds the item in question, to the first found slot and sets a bool var to true.
*If it does not find an empty slot, it sets the var to false.

All of this functionality is working except that from the interactible object, when I try to get the bool value, it always returns false. I'm sure it's a replication issue but I'm not sure where the breakage is. I need to check the bool because if the item is equipable, I try to add it to the player hotbar first. And if it can't find an empty slot, I want to then add it to the inventory instead.

Following are the code snippets:

Interact With event ON the interactible actor:

Add Item Server RPC on the Inventory Actor Component:

Add Item Function ON the Inventory Actor Component:

I have tried making that bool replicated and replicating the inventory components in my player character as well. Same result.

[hoary spear]

I solved this by including a ref to the actor that is attempted added to the inventory

And let the inventory destroy it 😅

With a bool , so its optional

You're instantly checking a local bool value, way before it can even possibly have time to replicate

@glad escarp

[glad escarp]

hmmm... Ok I'm not sure I can do the same thing with the way I'm handling it but I'll start fiddling

[hoary spear]

You could also make sure you're interacting server side. Then the actor could just do the regular inventory call and use the bool directly

[glad escarp]

hmmm. ok I can try that.

[glad escarp]

Fixed it. You pointed me in the right direction with the object reference idea. I just fed a reference of the interactible object into the inventory comp, used an interface function to set the bool on the object directly from the inventory and then destroyed it from the inventory.

[hoary spear]

Set the bool before destroying it ? 😅

[glad escarp]

Right. That's what I said. 😉 Sets the bool directly and then destroys if the add was successful.

[plain nacelle]

Does anyone know why my screen turns black when I am in splitscreen mode? Its so odd.

[candid shuttle]

is the movement of your second character intentional? I mean the sliding off to the right?

[fallen orbit]

Why components' OnComponentBeginOverlap event only happens in client rather than server?

[dark edge]

Maybe the overlap didn't happen on server, or maybe it did and you can't tell.

[hoary spear]

Sounds backwards thats all

[velvet jacinth]

An RPC problem:
When I'm executing a skill it is executing on the server. Inside that event logic there's a boolean that I'm getting from the Player Controller, and when I get that boolean, it returns false because this logic runs on the server where the boolean is on the client side.
I'm setting a boolean value in the player controller when the EnhancedInput trigger flow start.

I can't find a way to get the boolean for the owning client. And yes I did tried using RunOnOwningClient, but then the flow doesn't execute on the server at all..
This whole logic is inside an ActorComponent and his owner is the character.
How the hell can I get this bool value for the client where I need the logic on the server?

[worthy wasp]

taking a stab in the dark but i have the same kind of scenario with a listen server setup i'm working on now....

Simple solve (for me anyways) was to ensure that i'm setting this boolean variable as Server auth - which is what it sounds like you should be doing in your case. Then the client will be synced with server-side logic of the said boolean.

Hey guys! Happy wednesday 🙂

I have a Client RPC that i'm executing a delegate broadcast in - but my clients never enact on it.... is this to be expected of any RPC type event? I know that in Server auth - delegates dont happen to Clients... same to be said for any RPC event?

[velvet jacinth]

So using HasAuth and settings the bool there?
But the EnhancedInput is triggered on the client so it always be Remote on HasAuth

[hoary spear]

Rpc the input?

[velvet jacinth]

Still prints false in the ActorComponent

[hoary spear]

Are you sure the actor logic runs on server ?

[velvet jacinth]

So confusing

The get player controller func is just the basic getPlayerController with cast.

[hoary spear]

Ehhhh

You cant use that to any reliability in mp

Wheres the component?

In the player pawn?

[velvet jacinth]

In the player character yes

[hoary spear]

So

GetOwner -> cast to pawn -> GetController -> cast to MyPlayerController

Generally you cant use any of the "get X" with an index input

[velvet jacinth]

Same problem. still prints false.
No error by the way

[hoary spear]

Atleast now we know its the correct controller

Also

General advice is to cast to the most bssic type at all points

So dont cast to your specific char type

Just cast to pawn , as that got a GetController method

Also, your char class has a special controller ref, which doesnt make to much sense

Since pawn knows about its controller 🙂

[velvet jacinth]

You're right, by the case here is a bit different.
The character possessed by an AIController, the player controller possess a different pawn.
I need the AIController.
So I fixed the ownership issue and it's working as usual. but I can't get pawn as always

That's why I have a ref to the player controller from the character

[hoary spear]

Right

So GetController

Already handles that

As its player/ai parent controller

And can be either 🙂

Just means you gotta cast to the correct controller type

[velvet jacinth]

So I cast the owner to a pawn, and used GetController, but it returns the AIController which is correct because the PlayerCharacter possesed by it.

I need the PlayerController because there's the logic of the inputs

Ohhh got it. this is so confusing. give me sec

This works. I needed the get the owner of the AIController and then cast

[glad escarp]

Why? I want to make sure that the item was added to the inventory before I destroy the pickup actor in the world.

[hoary spear]

I didnt undertsand that the owmer of aicontroller was playercontroller 😆 but nice

[velvet jacinth]

@hoary spear Thank you very much it would take me hours to think about that if it wasn't for you

[hoary spear]

Sure but server side the pickuo can read the bool from the add to inventory function directly..

[glad escarp]

Right. But I can't handle it all in the component because the player character has two instances of the same component. The inventory component is the same class for the inventory and hotbar so I have to handle the bool, and subsequently the item placement selection, in a different BP. Unless I'm trying to revamp my whole system, which I may eventually do if this one sucks.

[hoary spear]

Ill stop asking questions now

😅

[glad escarp]

I'm not trying to be difficult. I just don't see a different way to do it even from server side, at the moment.

[hoary spear]

Yeah i get that, i was more thinking along what Tank just commented ^^

You're making it harder for yourself than it needs to be, imo

[surreal dragon]

Say if all I'm aiming to right now is have my friends connect to my session. I have the ability to create sessions, and have the clients join them when testing in the editor. I have my port forwarding all set up and all that jazz. Do I just need to send a build out to my friends to test this?

[hoary spear]

Id test it on two different pc's first, but yes thats what youd do

[surreal dragon]

that easy huh!

[hoary spear]

Can be troublesome to find the session if you're using the regular one i guess

Advanced steam sessions helped me out a while back atleast

[surreal dragon]

gotcha, thank you

[lapis minnow]

Does anybody know of a way to disable log files being generated when running a dedicated server

[nocturne quail]

how do write if (GetLocalRole() == ROLE_AutonomousProxy) in 4.26?

for me GetLocalRole() is undefined

[glad escarp]

Hey all. I've got an issue where I'm spawning an actor base class on server. The class has one exposed/instanced editable variable which get's fed in on construction, then in the construction script it sets the static mesh and a few other things using that struct variable. It works fine if I drag that class into the level, but if I spawn it in, I can't get it to switch from the default mesh. I've tried adding a custom event which I call when I spawn the actor, tried in Construction Script and EventBeginPlay, all to no avail.

[hoary spear]

Clients should prob use onrep

On a Replicated mesh variable

Set by a server called event on spawn

[glad escarp]

Hmm.. Not sure I follow but I'm gonna read this a few times and do some research.

[hoary spear]

Server spawn actor -> invokes a function to set the mesh

The function takes in the mesh and stores it in a replicated mesh variable

The variable is marked "rep notify" and gets a function that is called when its replicated

In this function you can safely grab the variable and be sure its replicated , and set the static mesh of the actor 🙂

[glad escarp]

ah... ok I will try that. Thanks!

[glad escarp]

Simple solution. It worked

[hoary spear]

It might work with the variable exposed on spawn aswell, so long as the actor is spawned from server.. not 100% how that workd behind the scenes

[glad escarp]

It does. I needed to keep both so I could drop items where I want them in the level and manually set their info variable.

[hoary spear]

Nice, then we know 🙂

[rose turret]

I'm having trouble understanding how AI works in multiplayer

I'm making a "game show" style game that can have human or AI players. I'm tracking everything about a contestant in player state, and I have both a PlayerController and a BotController (custom override of AController) that create/maintain that playerstate

I'm getting stuck understanding how to spawn a BotController, though. it sounds like I should spawn it on the server without replicating the controller to clients (?) but if that's true, how will their PlayerStates sync down

[hoary spear]

Botcontroller (aicontroller?) Wouldnt have a playerstate usually

[cosmic yoke]

hello i have an item struct that i use for my inventory and i want to pass those around, the problem is that i can't send struct pointers as a unique identifier

is using guids the best approach?

this is for rpcs and stuff

[rose turret]

it's so much cleaner for me to have one though, otherwise I need a separate class for things like player name, score, etc. and a lot of if-statements ("if bot, show score x. if player, show score y")

is that an anti-pattern?

[worthy wasp]

ACharacter (and any class based off this) has a variable in it for handling AI Bots - which spawns the controller automatically if this is configured this way.....

[hoary spear]

You could abstract the commonalities if the functionality is very different... or stick with sharing a parent, if that works well for you

[worthy wasp]

you dont spawn controllers - you spawn the class that has this configuration.

as for the Playerstate - thats not part of AIController logic - you'd very much have to manuall;y recreate that logic to get a PS to attach.

[quaint roost]

is there a callback for "actor entered net relevancy range again"?

in other words: I move my player away from an actor, it gets culled, i move back (callback fired now)

[worthy wasp]

but i dont think you need to - as Ai is spawned from server anyways (or should be - as it is controlled by server)

You could wrap up this information into a struct.

[hoary spear]

APawn*

[worthy wasp]

sure if you need to drive that far up the chain - but we dont typically make APawn for AI - unless you dont need CMC

[quasi tide]

Playerstate can be spawned by the ai controller. It's a property of AController

[serene kestrel]

not by default, no

[hoary spear]

Game show - idk what they use really

[quasi tide]

It's something like, bRequestPlayerState or something like that

[hoary spear]

Just wanted to be precise about it's inheritance

[worthy wasp]

this is good to know! but again i've never been in the practice of even using PS on a AI

[quasi tide]

I don't remember the property name exactly, but AI controllers can 100% have them. And it is allowed. I've never needed them personally though.

[hoary spear]

If only ditching bb and going ps was a valid path with bt :p

[worthy wasp]

funny you mention that - i'm doing a crowde/horde game atm and it is KILLING my FPS just by the AI alone... with almost no systems inside of it. Only real thing i'm using that is performant heavy is Sight detection

50+ enemies on screen will crush FPS flat.

[quasi tide]

Well, CMC and skele stuff are super expensive

Also animations

[worthy wasp]

take away the AI logic - runs almost full FPS

[worthy wasp]

it is not this....

[hoary spear]

What ai logic is this

[quasi tide]

I mean, I can get like 300 running around. Soooo

[hoary spear]

I did some custom ai logic and can run ~5k, but its not really that optimized im sure

[worthy wasp]

AIPerceptionComponent

[hoary spear]

Ah

My mistake lol

[worthy wasp]

i have no other Tick events that would crush like this :/

and that component is an overlap event driven as far as I can tell :/

i dont pretend to make heads or tails of it.

[hoary spear]

Ill be going for 50+ when i get to it , using perception

[worthy wasp]

i'm about to make my crowd start utilizing clusters - groups of 5 for 1 AIController/perception

[hoary spear]

But i may cheeze it a little , with a manager amongst them

[worthy wasp]

yah - a manager is like what i'm saying.

[hoary spear]

Yepp

[worthy wasp]

i figure - if i can fraction it by 5 (or more) then it'll be way more performant.

[quasi tide]

This is a very common optimization technique, as an FYI.

It's definitely how Days Gone got their numbers

[worthy wasp]

yah i figured as much - when i tracked it down to being specifically the AIPerception on them

i thought at first - skeleton/CMC - but nope :/

when stripped ... it ran almost full on FPS

[quasi tide]

I'd be interested in the actual profiling numbers.

[worthy wasp]

like how many i'm spawning?

[quasi tide]

No - the UnrealInsights that you used to profile everything.

Instead of just turning something off/on

[worthy wasp]

oh man i havent touched profiling yet - :/ Very ill-informed on that topic

[hoary spear]

Its pretty important for optimizing stuff properly

Knowing the bottlenecks comes a long way

[worthy wasp]

thansk for the term drop! I've pulled it up and bookmarked it for when i get to this

greatly appreciated

[grizzled garnet]

If I add an actor component server side and set it to replicate shouldn't that mean the component should replicate to clients?

nvm actor wasnt replicating

[serene kestrel]

happens to us all haha

[grizzled garnet]

yeah but that was just me confirming stuff in bp, now I'm figuring out the real issue which is why some dataasset objects arent replicating

[ruby lodge]

just making sure lol, is this replicated correctly?

it should replicate the horn sound

[sinful tree]

Not really, but only on account that you're effectively allowing a client to play any sound at any place on the map. You should limit the data the client is sending to the server and the server determines where and what sound to play.

Otherwise, that's how you can do it.

[glad escarp]

Does accurate replicated physics only work with a static mesh actor? I'm simulating physics on the static mesh component of an actor and no matter the replication settings I check and uncheck on the component and the actor, it always looks really jittery. I usually ends up in the same place for each client but not always.

[ruby lodge]

so you mean no matter where the client is playing the horn sound everyone on the map is going to hear it?

[sinful tree]

No, what I mean is, you're allowing the client to tell the server where and what sound to play. That means they can technically play whatever sound at any location.

[ruby lodge]

that's what is usually the point of a sound in game i guess? It should play the sound at the location of the player who made it for everyone around him to hear

but i hope it's not hearable on the entire map lmao

[sinful tree]

But you don't need to have the client tell the server that info. The server should be able to determine what sound to play and where.

Imagine this was a health/damage system. You wouldn't want the client telling the server how much damage they are doing. The server should know how much damage should be applied, otherwise you're allowing a client to say they deal 9999999 damage.

[ruby lodge]

hm i see, how do i fix that?

i guess thats bad from a cheating pov

[sinful tree]

You remove the inputs on the Run On Server event. When you're running on the server, have the server call the multicast with the desired location & sound

There are times when you need to pass information from a client to the server, but this isn't one of them.

[rose turret]

ReplicatedUsing question: if I have a replicated UObject* and I don't change what it points to but I change parameters of the UObject, will my outer UObject* OnRep function get called?

[nocturne quail]

using the same keys for character movement input and vehicle movement input is a conflict?

suppose I have one key binding MoveForward which uses the key W , so I move towards the vehicle and start posessing it, and for the vehicle I use the same key w to move forward.
at the time when I posessed the vehicle what was my last Forwad Axis value?

does it effect the vehicle movement even I don't press the w key?

[ruby lodge]

how shall the server get the desired location & sound?

[sinful tree]

Same way as how you'd get it from the client, except you're doing it on the server instead of the client.

[ruby lodge]

so what i understood is removing the inputs of the HornOnServer

and now you mean the circled nodes on the right should be executed on the server?

[fallen orbit]

In Lan Mode, On my Lister_server host, why is there still a NM_Client? And In this situation the character don't even have a controller

I being stupid again. It's the host's character in the client. Hahahaha

[hoary prairie]

Hey guys, I am working on my FPS game and have setup a rather basic aim offset system. There is a super weird problem I am facing at the moment.

The way I have shooting setup is that, a client fires sends an rpc to the server which then spawns a replicated projectile.

This projectile works fine, you can kill player etc. But when a client is facing down, where their head isn't where it is normally, other clients cannot hit them. When playing as the listen server it seems to work. I can't figure out why its happening and its really critical :D,

Here is a video demonstrating the error, you can see how I can visually see other clients aim offset, but the server sided projectile ignores the hit, but when firing at where their head would be without any aim offset it seems to register an hit.

This makes me believe that the server doesn't know of the aim offset on the clients, but somehow when you're the listen server you can still see the aim offset and even hit them so its got me super confused 😅

https://streamable.com/fbgasz

[sinful tree]

You still need to call to the server, but you don't need to pass it inputs. You can have the server read the world location of the actor for the location of the sound and you just select whatever sound you want for actors to play directly in the multicast call.

[hoary prairie]

The aim offset is a replicated variable in the character that is set in tick from the control rotation, I've checked and each characters aim offset variable seems to be replicated perfeclty. And I haven't been able to fix this small issue for 3 months, and its really getting frustrating, and it seems I am just making a idiotic mistake which I can't figure out

If you need anything from me, I will gladly present it. I am mainly trying to learn so if we can find a solution it would be awesome if you can explain it

[sinful tree]

It's likely because your collisions are not based on the mesh of the actor, but rather the actor itself which is that capsule you see.

[hoary prairie]

I had to check this at the time, but unfortunately not 😅 . Projectile collision class ignores the capsule, and only collides with the mesh.

[hoary prairie]

I also confirmed it at the time by printing the hit comp, it does successfully collide with the mesh. I am just super confused on why the animation visibly changes, yet the projectile still fails to collide unless you're the server....

[slate basin]

hey, if you have a FFastArraySerializer, is there a way to call a rpc function that can refer to the same item on the client/server?
i.e I want select an item in the array, then call a server rpc and tell the server what item I'm refering to
FFastArraySerializer don't have the same index on the client/server, so do I need an id on the struct itself?

[fossil spoke]

What are you trying to do?

Search the array?

You can setup an ID as a property of the FastArray Element

And use that to search for the same one

[slate basin]

yeah, Idk if I need to use FGUID or just the index of the item on the server as the id itself

[fossil spoke]

Do not rely on the index

Order is not retained

On Arrays

[slate basin]

that's between the client and the server right? oh actually nvm, it will reorder if I remove something in the middle or add something in the middle for whatever reason

[fossil spoke]

Its not guaranteed across the network at all. It doesnt need to be reordered. Just the fact its replicated means it may not be serialized on a Client in the same order as the Server

[slate basin]

yeah I mean have an id on the struct, then use the index for that instead of having 16 bytes guid

[fossil spoke]

An FGuid is unnecessary. An int would be enough.

Just increment it and assign it to each element when the server adds one

[twin juniper]

Hi guys, quick question, is the Character AddImpulse method replicated? I am working on a slide mechanics and while it works, the initial slide is giving me issues...

[fossil spoke]

What do you mean replicated?

If its called on the Client it wont work, the server will correct you.

If its called on both though, it should work ok.

However a Slide would just be a different movement mode that reduces velocity over time.

[twin juniper]

I am calling it on server, and the slide is implemented over walking movement mode

it works fine, just the impulse giving me inconsitent results

[slate basin]

you could take a look at how Epic did it for unreal tournament, I remember seeing the explosion impulse for player characters being on there

[twin juniper]

ah, will check it out, thanks!

basically my question arise because if I use : AddImpulse(Velocity.GetSafeNormal2D() * 1000.0f, true); it do nothing, however

Velocity += Velocity.GetSafeNormal2D() * 1000.0f; it 'works'

[plush crow]

hi guys, is there a way to set a variable from the host to all clients?

[slate basin]

store the variable on gamestate?

[plush crow]

this way when the host changes the value of the variable on the game state, any client can get the variable set on the gamestate?

[grand kestrel]

Is there a FVector_NetQuantize for float for easy compression during serialization
Like an FFloat_NetQuantize100

Guess I'll just write my own I'll just use the vectors, they won't cost extra if I don't use the other axes

[daring arch]

Quick question- my character (ACharacter) has just picked up a weapon (AActor).

I want to fire Server RPCs on this weapon actor.

Is there any way to transfer the ownership of that weapon to my Player so that I can call Server RPCs on it directly or should I re-route all RPC calls to my PlayerController?

[fossil spoke]

Just call SetOwner on it when its picked up

And pass it the Pawn

An Actor needs an owner hierarchy that leads to a "NetOwningConnection" to be able to call RPCs

So if the Weapon is owned by the Pawn and the Pawn is owned by the PlayerController (which is the NetOwningConnection), then the Weapon can call RPCs because its owned indirectly by the PlayerController.

[daring arch]

Hmmm.

My weapon has a "WeaponMechanism" component.

Is ownership also relayed to ActorComponents?

[fossil spoke]

Well yeah, they are owned by the Weapon

[daring arch]

I've done SetOwner and it seems like the owner has been changed but my RPC still isn't happening

I must be doing something wrong

[fossil spoke]

Is the Weapon set to Replicate?

The Actor must still have its Replication flag enabled

[daring arch]

Yeah- both Actor (weapon) and ActorComponent (hitscanMechanism) are set to Replicate

Huh, this prints empty

(this is from the ActorComponent)

(first GetOwner is to get the Actor and second GetOwner is to get the...new...owner? of the actor?)

This is what I'm doing in my Pawn's "Weapon Handler" ActorComponent, inside a serverside function:

    AActor* weaponWielder = GetOwner();
    CurrentWeapon->SetOwner(weaponWielder);

[fossil spoke]

If this is called inside a Pawn you probably want CurrentWeapon->SetOwner(this); instead

[daring arch]

This is called inside an ActorComponent for a Pawn

[fossil spoke]

Ah

Try just using a direct reference to the Pawn instead

[daring arch]

Uh, how can I do that? I've thought that the only way to get the owning actor of a component was through GetOwner()

[fossil spoke]

Yeah not sure why it would be empty? Unless you are debugging it incorrectly 🤷

[daring arch]

Possibly! lol

[fossil spoke]

Without more information or context Im not sure what else to suggest

[daring arch]

Right, I'm probably messing something up- the logic seems to make sense, there's probably something I'm not doing right

I'll give it another check- thanks!

[pseudo kernel]

When replication methods are called, is it possible for them to get called even if the value hasn't changed? I.e. let's say I have a UUID replicated by an OnRep method. Assuming the server only ever sets the UUID uniquely, is there any potential for the client to have OnRep called multiple times even if it doesn't change?

[hollow eagle]

Only if you want it to.

By default no, OnReps are only called for changes.

[daring arch]

So, here's my conclusion:

My Actor's Owner, on the Server, is correct.

My Actor's Owner, on the supposedly owning client, is incorrect.

The server has the right data. The client, however, is unaware that they are the owner.

[hollow eagle]

Are you trying to have the client send an rpc right as the owner gets set?
It's likely that the new ownership has not replicated yet.

[daring arch]

Nope- the RPC is only sent a few seconds after.

Huh- "No owning connection for actor"

The server has the right info but the owning client does not. I guess I'll just call SetOwner locally I guess?

lol that made no sense at all but fuck it, it's working now

[hoary spear]

Sounds like the owner was incorrect after all 😅

[pseudo kernel]

Is there an easy way to determine if a player belongs to the current client? I know that player controller returns null for everyone but the player + the server, but what about the case where I want to check if it's not the server's own player for non-headless instances?

https://docs.unrealengine.com/4.26/en-US/API/Runtime/Engine/GameFramework/AController/IsLocalPlayerController/

I think this is the right method? 👀

[short arrow]

IsLocallyControlled

[pseudo kernel]

This worked perfectly. Learning multiplayer sure has been humbling. I'm making good progress but it's definitely taking a whole new way of thinking compared to before.

[short arrow]

oh yeah multiplayer is a drastically big step from single player

goodluck!

[nocturne quail]

finally I have done with this
the whole chaos physics breaking to make it work in a multiplayer game, it was that simple i'm shocked 😄 , curious why on the earth nobody has made a tutorial on this?
well save this picture to save you many days figuring out this system to work with network game, specially dedicated server

input

[short arrow]

this looks like you have the right idea, but you're calling a reliable RPC on a ticking event. There is most likely a better way to handle this

[nocturne quail]

totally agree, this is just a work around to make things work, and can be improve for sure 🙂

[nocturne quail]

a small bug fix

[shrewd ginkgo]

I want to make skill for one of The players in my game. He must see other players trough walls. How canI do it

[pseudo kernel]

I'm curious about when to use RPC and when to rely on prop replication.

I have a simple start/stop ability system working with networking. Its server authoritative and currently uses prop replication to update start/stop time props, which clients listen to in order to play the actions (with some error tolerance)

I could easily use a multicast to relay the start/stop, but this seems to be working fine.

Is the approach ok?

[bright fern]

Hi everybody,
Do someone know a good tutorial about multiplayer over internet with c++?

[pseudo kernel]

I like Tom Looman's course but it's pricey. Stephen Ulibarri on Udemy is supposed to be good too.

[dire sable]

Hey there, having the same issue and I wonder if you came up with any solution?

[bright fern]

@pseudo kernel Thank you
Is there free thing?

[pseudo kernel]

Not sure, if price is an issue you can look into Stephen's courses which go on sale really frequently. I think I got his GAS one for $12 which is a steal for how much content it covers

[twin pendant]

Unfortunately not, we haven't switched to ue 5.3 yet, but i really hope it will fix it for us

[bright fern]

@pseudo kernel, thank you so much
I'll have a look at those courses

[dire sable]

Welp, thanks anyway, I'll get to you if we will be able to solve it

[twin pendant]

thanks! On which engine version are you currently?

[dire sable]

Exactly 5.2.1

Also with partitioned maps

Also trying to connect as a client on a server

And it does seem like it's not replicating anything to a client

[rocky kestrel]

Hello. Why this not work in multiplayer but singleplayer it works and how I could fix that?

[twin pendant]

like already when connecting or do you also crash when disconnecting?

[rocky kestrel]

This not get executed in multiplayer

[twin pendant]

i guess this is an anim notify event?

or how do you "register" footsteps?

[dire sable]

We get the crash when leaving the map

[twin pendant]

yep alright then it is the same issue as we have

[dire sable]

And it doesn't matter how we leave it, alt+f4, closing the server or exiting via menu

[rocky kestrel]

I call that anim notify in walking animation always when foot hits ground

[twin pendant]

then you don't need to call here a rpc since the anim notifies should called on server & client, basically on all machines where the anim is playing, so just make the play sound at location not replicated

[rocky kestrel]

Okay thank you!

[torpid girder]

Hello, I was wondering if something changed how i attach a USkeletalMeshComponent in multiplayer,

        NewComp->AttachToComponent(MainCharacterMesh, FAttachmentTransformRules(EAttachmentRule::SnapToTarget, true));
        NewComp->SetSkinnedAssetAndUpdate(ArmorToAdd->GetArmorMesh());
        NewComp->SetLeaderPoseComponent(MainCharacterMesh);
        NewComp->bUseBoundsFromLeaderPoseComponent = true;

I am calling this as a multicast and i can see it being executed on both the server and client

what is happening is that it works in single player mode and the attachment is working fine, however in multiplayer the NewComp spawns at 0,0,0 sometimes there is animation replication

[pseudo kernel]

Is there a reason you chose to use a multicast for this and not some sort of state replication with an OnRep instead?

[ruby lodge]

About the sound you meant to just select it in the multicast node and not give it through an input. The location also not through an input but how else? How do I make the server read the world location of the actor? Do you have a node setup maybe, thta would be very helpful!

Do you mean to have the "is player controller" and "get focal location" nodes also inside the multicast?

[torpid girder]

good question, however why would that change how the attachment was working?

[dusky yoke]

Thanks for the reply! Since Im running the code on Event BeginPlay I found that it would still be out of sync, since the client's BeginPlay is run later than the server? The event is run by the server, but still seems to matter when the client loads in? I set the ball to replicate, and the timer is ran by the server. Please correct me if I'm wrong 🙂
To solve it I casted to the gamestate and grabbed GetServerWorldTimeSeconds and ran the timer with an Addition based on that time, which gave me synced & replicated spawning.

[stuck cloud]

Basic question, when I store a list with pointers to all joined player controllers within GameState, will clients be able to access playercontrollers that aren't on the local machine?

[queen escarp]

Hey Got adviced to add some Network Emulation

whats a good Default "low" setting for a listen server * ?

[hoary spear]

Not directly

But you can code it so they can manipulate it

But playercontrollers are only replicated to the owning client iirc

[stuck cloud]

Ok cool. I figured it's the better idea to keep track of the player controller pointers within GameMode instead GameState, on the server it should be possible right?

I think I'm then gonna update the GameState from within GameMode with only the relevant bits of information

[silent valley]

(c++) In terms of Actor lifecycle.. which function can I override which is as late as possible, but guaranteed to be before replication/onrep events?

PostInitializeComponents ?

[sharp vigil]

Is there a decent resource out there on giving the basics for creating a more performant custom movement component?

or is there usually no need for that with the PawnMovementComponent?

[silent valley]

I wouldn't worry about it unless there's a problem

[sharp vigil]

Im focused on creating an RTS and everything I've read so far says CMC is not what you want to use. I'm wondering if pawn movement component has the same constraints.

[silent valley]

RTS is a bit different, if you have hundreds of units moving via CMC then it might be a problem.
I'd still suggest working on your game rather than prematurely worrying about optimizing something in a way you don't fully know how you're going to be using it yet.

[sharp vigil]

hmm fair enough, thanks. Still if anyone has any other commentary or resources that have more to say I would love to be directed towards it. I don't think I'm prematurely worrying. It's a valid concern.

[silent valley]

CMC is designed to give a good experience for local player with prediction while still being server authoritative and good enough for remote observers. For this it implements a bunch of state and rollback etc.
For an RTS you probably don't want any of that, you need to decide what you actually do need before deciding what a replacement might look like for example.

[sharp vigil]

I gotcha. Thank you.

[ocean laurel]

Yeah, a lot of the time it's not necessary to use RPCs if you have something purely server authoritative that's replicating all required information to clients. Personally I'm a big fan of using RepNotifies for a lot of things when I can, makes things a lot simpler, but rpcs of course have their place.

[stuck cloud]

When deactivating splitscreen. How can I switch the view to a different Player Controller?

[abstract pike]

@fathom aspen Did something change to seamless travel or persistence with pawns in 5.3? You seem to be the going expert on this and I'm suddenly finding that references to my pawns which used to survive the travel are now left as nullptrs... 🤔

[hoary spear]

Your options comes down to numbers and how much optimization you've got time to do

Numbers -> how many simultanious controllable agents

Ive heard people using cmc for numbers between 50 and 300, but theres a ton of unknowns with those numbers so take em with a bucket of salt

[ruby lake]

how do i add mapping context to a client? possesedby? like if (!HasAuthority()) { if (UEnhancedInputLocalPlayerSubsystem* Subsystem = ULocalPlayer::GetSubsystem<UEnhancedInputLocalPlayerSubsystem>(Cast<APlayerController>(GetController())->GetLocalPlayer())) { Subsystem->AddMappingContext(DefaultMappingContext, 0); } else { UE_LOG(LogTemp, Error, TEXT("Subsystem or local player is invalid.")); } }

its not working

[cosmic yoke]

hello is there a built in way to send text chat messages to the team or to everyone? i could use multicast rpc and filter if it should add the message to the UI, but that seems a bit inefficient and unsafe

[silent valley]

The client must send the msg to the server, then the server must RPC to each team member individually

[pseudo kernel]

Makes sense thanks, in this case the server is authoritative but the actions still get triggered by the OnRep to do some animations and stuff, so it seems to work well

[cosmic yoke]

@silent valley so a client RPC for each player controller in that team

[silent valley]

yep exactly

[cosmic yoke]

ok i'll try it thanks

[ruby lodge]

Is it now correct like this?

Reminder: Is this the correct way to play a sound with a button press at the location of a player for only the people around him to hear?

[latent basin]

Hey all what is the command or how do i simulate network lag again?>

Cant find the command on google

[twilit radish]

@latent basin If you're in the editor you can go to the "Advanced Settings" when clicking on the three dots next to play, from there you can emulate all kind of things if you enable the checkbox.

[latent basin]

Thanks alot

[abstract pike]

Nevermind! It was a casting issue where the pawn was failing to set.

[ruby lodge]

Is this replicated correctly? Client event is set to multicast and server to Run on Server

Everyone should see when the roof opens or not

[dark edge]

delete every multicast from your project

repnotify

[ruby lodge]

why though

[dark edge]

Because pretty much any usage of it you have would be much better as a repnotify with only a few exceptions

door being open is state, state should be replicated. If you want something to happen when the state changes, use a repnotify

[ruby lodge]

you mean from an optimization pov?

how do i use a repnotify

[dark edge]

What happens here if someone is out of relevency range and then comes closer? They didn't get the multicast to open the door, so what do they see?

or a late joiner

[ruby lodge]

oh you mean the variable thingy

[dark edge]

I mean they'll see the door shut when it's open on server and clients who got the RPC

just don't use multicasts for state

use repnotify, it's much simpler too

[ruby lodge]

why wouldn't they get it

okay wait

i will show you in a sex

sec

[dark edge]

Because they weren't connected or were out of relevency range

no need to show me, using multicast for this is not a good idea

[ruby lodge]

i mean to show how to set it up

[ruby lodge]

do i just set the "OpenedRoof" variable to repnotify and put the OpenRoofOnServer before the branch and delete the client node completely?

[dark edge]

Yes it'd go like this:

Client:
Input -> RunOnServerEvent

Serverside:
RunOnServerEvent -> set bOpenedRoof

Everywhere:
OnRep_bOpenedRoof -> branch -> play animation

[ruby lodge]

so like this? Server node is set to RunOnServer and openedRoof is set to repnotify

[dark edge]

no

[ruby lodge]

i guess animating roof also needs to be repnotify then

[dark edge]

you'll have to do some thinking to deal with the animation time but for now just play the animation

if someone joins late they'll see the animation playing

not just snap to the roof open

but that's a problem to fix later once you've figured this out

[ruby lodge]

what do you mean

figure what out?

the animation is 5 sec long

[ruby lodge]

so it's wrong like this

okay gonna put it back to multicast

didn't really understand how to setup the repnotify one and multicast worked so far

[dark edge]

good luck

[ruby lodge]

thanks man!

[fathom aspen]

Good that you managed it. But pawns don't persist by default at all, so it's on you to do that

[glad escarp]

Hey again smart people. So I've got replicated pickup logic functioning just fine. Each client can pick up resources and equipable items and they are added to the inventory and displayed when equipped. However, I have my wires crossed somewhere with the widget functionality. There's an "added item" widget that pops up on the left side of the screen when you pick things up, and the widget hotbar updates when something is picked up. The issue I'm having is that while the pickup functionality works fine on any client, the widgets only work on client 1. In fact, anything I do in any client, happens on Client 1's widgets:

[dark edge]

show code

smells like get player 0 shenanigans

[glad escarp]

hmmm. I'll try to figure out how to show code. The routing is a bit complex

[glad escarp]

I'm using an interface to directly get my PC from my character so I don't think it's an index problem, though I will start looking to see if that's the case

[glad escarp]

You were right. It's trying to get the controller at index 0. I haven't set up my spawning system yet so I don't have a way of assigning a player index. I guess I'd better set that up next.

[glad escarp]

Thanks. Sometimes pointing out the dumb obvious things helps. I need to get out of the habit of using "GetPlayerController" and into the habit of using GetOwner->GetController

[pseudo kernel]

Any-one have a good pattern for firing off one time events without RPC, which I'm trying to avoid overusing.

For example if I want an actor to make a noise, I've been using prop rep by replicating down the current game server time.

If on the clients the time is arbitrarily "close enough" + some other constraints, then I also play the noise due to OnRep.

Using the server game time seems to work, but I wonder if there's a better / more established approach here.

[quasi tide]

Don't avoid RPC's arbitrarily.

RPC's are great for fire & forget stuff. IE - making a noise.

OnReps are for stateful things

[pseudo kernel]

Ok yeah this is where I get confused on "best practices" which seem so hard to track down.

So an unreliable multicast RPC is an appropriate solution for doing something ambient, like short term VFX or sounds?

[quasi tide]

Yup

[dark edge]

RPC for transients, RepNotify for state

[pseudo kernel]

Cool that's easy enough. Ok so what about another quick example.

Let's say I have a hit flash effect, and health is replicated. On the client I can tell the difference in health and apply the hit flash as a part of the onrep.

In this case, it's a better solution than multicasting it, right?

[quasi tide]

Yeah

[pseudo kernel]

Sweet ty

I guess that makes sense, unreliable multicast can be used when there's already no established state to trigger or react to a quick event

One more question now that everything is starting to make sense.

In general maybe I was confused about being careful on RPC vs Prop Rep.

Maybe it's more correct to be concerned about reliable rpc, where unreliable isn't as much of an issue? Is that where you start to have networking issues by using too many reliable RPC?

[dark edge]

Yes, if you're ok with not all hits being flashed

You might end up with some stuff batched where you get one 20 hp change instead of 5 4 hp changes

[last bough]

Does anyone have any tips or recommendations about deploying a dedicated game server, for a small-medium sized project, on something like AWS?

[hoary spear]

This is a gold habbit for multiplayer !

Along with always providing an owner for the spawned actors and widgets !

[glad escarp]

Too right. I'm learning that the hard way right now. 😉

[nocturne quail]

enabling Substepping is expensive for performance?

[ruby lodge]

why is this giving me "cast failed" when playing multiplayer? That's in the pawn bp

rip is the string to be printed when the cast fails lol

[nocturne quail]

set 0.3sec delay after begin play

controller is not yet ready and you attempt to cast it

[ruby lodge]

i have the same setup with a character bp and there it works

i put a delay after cast failed and then back to the cast node

[nocturne quail]

put delay before the cast node

always casting on begin play put some delay

[ruby lodge]

why not after it failing?

[nocturne quail]

because it is fully loaded in the delay and you successfully cast it

[ruby lodge]

ah i see okay

[ruby lodge]

it's still not working for the client

the server goes through the code yes, but the client not

i tried multiple delays but none worked

[nocturne quail]

player controller only available for

[fossil spoke]

@ruby lodge You want to use Restart instead of BeginPlay for Pawns.

The PlayerController is ready on the Client when Restart is called for that Pawn.

Obviously except for Simulated Proxy Clients.

[ruby lodge]

so switch beginplay node with "event receive restarted"?

[fossil spoke]

Yes and remove OnPossessed

OnPossessed is only called by the Server.

[ruby lodge]

okay

[ruby lodge]

So right now the prints go like (bottom one came first) :

Client 1: Through
Server: Rip
Server: Through

and the client doesn't spawn every time

[fossil spoke]

and the client doesn't spawn every time that sounds like an unrelated issue

Also, without showing code we dont know if you have done what we asked correctly or not

[ruby lodge]

ah haha i see, the rip is apparently a "rip 2" so it comes from the second print here on the right