multiplayer

[thin stratus]

So if you want to be sure that you need it you gotta remove it and test

There is even a console variable to force combining off :P

[grand kestrel]

Will give it a try

[real ridge]

guys quick question do I know mix array somehow? I have custom spawning but this for loop is checking playerstarts one by one in same direction every time so it will pick always first red and first blue, not if I will always mix it

how I can mix it ?

i dont want to delete them / my game has also respawn

then they will not be able to respawn

ooo shuffle

okay ths

thx

[rose pollen]

I have a replicated pawn I have attached a child actor component to, then i set the child actor class of that component to a replicated actor. When the server dynamically spawns the pawn using "Spawn Actor" everything works fine, but when I just have dragged the pawn onto the level about 50% of the time the child actor isn't visible to the players (but logging shows it is there from the servers perspective)

is there something about the loading order of the level where if the pawn loads before the players that the replicated child component isn't visible or something? any idea how to fix this, is very annoying for trying to test some behavior in PIE

[grand kestrel]

@thin stratusDo you know if there's a way to disable CMC's root motion prediction easily? They didn't make a bool or something? 🤣 Trying to implement my own for a specific system and I think it's conflicting

Might try removing it from the move response container

[twilit radish]

Poor Cedric is going to get nightmares again over the CMC at this point lol.

[grand kestrel]

I'm revoking my question, looking at it, its too.. integrated, I'm probably tackling what I'm doing the wrong way 😄

[twilit radish]

Also I tried to profile Iris just now, but honestly I have absolutely no clue what it's supposed to change. I don't see any real differences in my profiler (if anything Iris has some weird spikes(?)). But I can't tell if my profiling technique is just wrong, if I'm just stupid and perhaps didn't properly disable it again or something or just have a bad testing case 🤷‍♀️
Basically set up a scenario with a listen server and client and a thousand replicated actors with 2 properties being changed in tick.

[grand kestrel]

Should just let it try and predict it instead of doing it myself, and just predict the stuff it doesn't do like motion warping vectors and the actual montage thats playing (which can, albeit rarely, get out of sync)

[quartz panther]

soo, i finally made a sucessfull connection to dedicated server through eos using two different machines... the lack of port forwarding was an issue and i didn't need a static ip address in the end... hopefully that would work with other machines with different internet connections.

[grand kestrel]

EOS should definitely be taking care of the IP routing so yeah wont need static IP

#epic-online-services you might want this channel tho

[quartz panther]

now my question is how could i join a session as a group of players (something like in tarkov) lets say i invite 4 more players in the group, the group leader is the one who decide when we join the server. is that something that is difficult to implement with eos or is it supported already?

@grand kestrel is this still a EOS related question? i assume this is universal to how unreal handles connections?

[grand kestrel]

Isn't this just lobbies?

[quartz panther]

sorry, just started with the whole multiplayer thing, still not 100% on point with the terminology.

[quartz panther]

I'll check it out, thank you for the hint.

[pallid mesa]

smooth instant replays on lyra? hell yeah https://gyazo.com/a6f3a9d814d7a1a37111463aa0b0e7e4

I think this was an interesting experience

[twilit radish]

👀

Casual half a second debug break though 😂

[pallid mesa]

yeah hahaha

lyra has too many ensures

and ofc when you duplo the dynamic level collection all the gameplay features yell at you

so you need to be like suuuuper careful because some GFs react to the AddToWorld delegate

the way to differ from the replay world is that noone got a controller

a bit iffy but got it working nicely

[twilit radish]

🤔

[winged badger]

i love when you get crash/bug reports because someone was using a debug camera, too 😄

debug camera controller has no pawn

[pallid mesa]

haha

this is the other way around

these pawns are treated like sim proxies

so no controller anywhere XD

I just set my viewtarget to the instigator pawn and interpolate rot and loc

rot is getbaseaimrotation

which is replicated and makes it onto the replay world (duplicated level)

so i had to override the camera component and the camera modes

[grand kestrel]

Hmm why can't CMC handle a montage played from HandleImpact predictively, it just desyncs each time whether I do it via a local predicted GA or through Montage_Play

    Super::HandleImpact(Hit, TimeSlice, MoveDelta);
    
    UAnimMontage* Anim = TraversalAnimations.Last().Montage;
    const UAnimInstance* AnimInstance = CharacterOwner->GetMesh()->GetAnimInstance();

    if (!AnimInstance->IsAnyMontagePlaying())
    {
        bIsTraversing = true;

        if (UAbilitySystemComponent* ASC = UAbilitySystemGlobals::Get().GetAbilitySystemComponentFromActor(GetOwner()))
        {
            const FGameplayTag Tag = FGameplayTag::RequestGameplayTag("Ability.Traversal");
            ASC->TryActivateAbilitiesByTag(Tag.GetSingleTagContainer());
        }
        
        // AnimInstance->Montage_Play(Anim);
    }

It handles it fine if it stems from an input

I must be missing something obvious

[pallid mesa]

didn't succeed there either, if you find out lmk o>

[grand kestrel]

I could make it caches the result then a "pretend" input applies it, but thats an awful hack

Is it.. like.. double prediction, where the HandleImpact is already predicted but then its predicting the root motion on top of it

@pallid mesa HandleImpact only sets bQueued to true, this doesn't desync

    if (bQueued)
    {
        SetMovementMode(MOVE_Flying);
        bIsTraversing = true;
    
        if (UAbilitySystemComponent* ASC = UAbilitySystemGlobals::Get().GetAbilitySystemComponentFromActor(GetOwner()))
        {
            const FGameplayTag Tag = FGameplayTag::RequestGameplayTag("Ability.Traversal");
            ASC->TryActivateAbilitiesByTag(Tag.GetSingleTagContainer());
        }
    }
    Super::TickComponent(DeltaTime, TickType, ThisTickFunction);

Oh, well, I'm wrong, sometimes it does

Its a start

@pallid mesa Got it, just move SetMovementMode into the ability. Doesn't desync now

So the main thing is to remove it from the predicted loop into TickComponent

Finally, a way forward 😄

You could probably get away with SetTimerForNextTick within HandleImpact but I haven't tried yet

[modest crater]

Hey Guys I'm stuck an I'm not sure where a better place to do this is. I'm creating a widget that is acting as my "main HUD" because its just like the master widget with all other health, score etc related widgets within, It works fine when create an add it to the viewport in BeginPlay of the controller class where I just guard it with a IsLocalController, my issue is when it comes to respawning, I'm trying to have my game mode handle creating a new pawn an calling unpossess an possess on the new one and then after I call posses in the game mode Im calling a client function on my player controller that is responsible hooking up the new pawns OnHealthChanged an other delegates, my issue is when I call it for clients (not listen server) the new APawn* newbodyI pass through is null for clients but not for the listen server. I assume it has to do with not replicating in time before i pass the pointer but im not sure. Here is the code an the Client_NotifyClientOfRespawn

void AMinion_GM_Base::RespawnPlayer(APlayerController* pc)
{
    if (IsValid(pc))
    {
        APawn* oldPawn = pc->GetPawn();
        pc->UnPossess();
        FTimerHandle respawnOnTimer_Timer;
        TDelegate<void()> respawnLogicDelegate;
        
        respawnLogicDelegate.BindLambda([this, pc, oldPawn]() 
        {
            const FVector spawnLoc = FindStartLocation();
            const FTransform spwnTrans = { FQuat::Identity, spawnLoc };
            FActorSpawnParameters spawnParams;
            spawnParams.SpawnCollisionHandlingOverride = ESpawnActorCollisionHandlingMethod::AdjustIfPossibleButAlwaysSpawn;


            APawn* newbody = GetWorld()->SpawnActor<APawn>(minionPlayerSubC, spwnTrans);
            if (newbody)
            {
                pc->Possess(newbody);
                oldPawn->Destroy();
                
                if (AMinion_PlayerController* castPC = Cast<AMinion_PlayerController>(pc))
                {
                    castPC->Client_NotifyClientOfRespawn(newbody);
                }
            }
        });
        GetWorld()->GetTimerManager().SetTimer(respawnOnTimer_Timer, respawnLogicDelegate, 5.0f, false);
    }
}

[modest crater]

Inside of the client function if comment out the code and print its current GetPawn() it should in theory be the new pawn I just possessed (which it is on the server) but not for the client, the server is clearly aware of the new pawn an possession before the client is, clearly I need to move where this is being done but im not sure where to move it to

[winged badger]

the RPC will arrive before the NewBody Actor replicates

so the argument it carries cannot be resolved on clients

[modest crater]

I'm unsure of where this is "suppose" to be done

[winged badger]

there is AController::SetPawn function, virtual and runs both from server after possess and on clients after OnRep_Pawn

you should use it to wire your logic there

[modest crater]

thanks, ill try that

[winged badger]

this will work for local client only btw

as the others don't have the player controller involved in this respawn

[modest crater]

So it wont work for a listen server? sorry im just new

[winged badger]

it works fine for the server

as it has all the player controllers

and for local client, as it has the PC for which you're doing the respawning

on other clients though, that SetPawn won't run as there is no instance of the PlayerController for which the pawn is being set present

[modest crater]

Oh okay, I understand I think

[winged badger]

but as your client RPC is failing, and it runs only on local player involved

SetPawn should do just fine

that function is also a good place to bind various delegates... etc. that need to be bound on both server and client

[modest crater]

Is it normal for this to be called so many times?

[winged badger]

its plausible

unposessing and possessing both call it on both server and cleint

[modest crater]

where do all the cool kids put their UI updating logic for new pawns? im struggling, lowkey about to set a .5 second timer to update after possession an call it a day hahaahh

[winged badger]

you can just call a function/event on the HUD from there (on local client)

or broadcast a delegate HUD listens to, same difference

if your HUD has a c++ base, PC has OnPawnReceived delegate (if i recall the name right) that would also work, but its not dynamic

[modest crater]

Yeah it was the right place I was looking for, I just did a few checks with a cached pointer to ensure it didnt make multi huds. Thanks heaps for the help I really appreciate it

void AMinion_PlayerController::SetPawn(APawn* InPawn)
{
    Super::SetPawn(InPawn);
    
    if (IsLocalController() && InPawn && InPawn != currentPossessedPawn)
    {
        currentPossessedPawn = InPawn;
        Client_NotifyClientOfRespawn(currentPossessedPawn.Get());
    }
}

[real ridge]

thanks i did same way like this but for some reason its not working need to find problem i dont see any bar

it looks like on the start of game its loaded but immediately get deleted

ah found problem my pawn is not valid weird

[fierce grove]

I have a PC that has temporary ownership of a server Pawn... setting ownership to the PC works... what when I want to remove ownership what would be the right way?

[chrome bay]

SetOwner(nullptr)

Careful though as posession/unpossession also messes with the owner

[fierce grove]

I don't possess the vehicles, only rerouting inputs

[swift olive]

My player pawn is stuttering on the client, i profiled with Unreal insights and im only sending a couple bytes so it shouldn't be latency. Anyone got a clue what it could be?

[twilit radish]

An actual pawn or a character?

[swift olive]

Character

[kindred widget]

Please at least say that you're calling EnableInput and handling the controls in the vehicle and not actually rerouting them through the controller or pawn?

[twilit radish]

Did you modify specific parts? Unless you perhaps turned emulation settings on by accident or modified things it definitely shouldn't stutter. Also how are you adding the input to the character?

[fierce grove]

yep 🙂

[twilit radish]

You guys don't make a big web of code going to random actors to just get input somewhere? /s 😂

[kindred widget]

It drives me nuts when people put controls in their controller, just to store a reference to something and call custom inputs. 😬

[twilit radish]

I'm going to be honest with you, when I started with Unreal at some point I did something like this in the absolute worst possible way. I had a pawn that received input and I needed it on a different actor. So what I did was I created a method for every single input I needed on that pawn and then inside the body of that I called the appropriate function on that actor 😅 😆

Unreal has definitely been a journey so far lol.

Also as a disclaimer, no this was years ago I definitely don't do this any more.

[upbeat crystal]

I have a question Multiplayer Join Session I have a vehicle and character blueprint setup it works fine in 2 windows without joining session but when you create and join the session it does not update the collision

[kindred widget]

Yeah. I had a few small arguments over that with people who somehow think that enable input is bad. Like.. You're doing the same thing! Just in a worse way!

[kindred widget]

Collision state should probably be replicated instead of multicast.

[copper grove]

Vori 👋🏻 is there anything additional to implementing animation budget allocator, I've got it turned on I can see in the console log, I have skeletal mesh component budgeted as my character meshes, set to auto register, but it never actually kicks on... [i have it set to 0.1) just to see it kick on and even with an army of characters it never does

[blissful atlas]

how to lobby in unreal engine

is there a video

[meager fable]

You can start with unreals tutorial series, they are pretty decent although there are mistakes there https://www.youtube.com/watch?v=abmzWUWxy1U&list=PLZlv_N0_O1gYqSlbGQVKsRg6fpxWndZqZ

[blissful atlas]

thanks

[meager fable]

I'm trying to add a teleport type movement to my character that is already moving with character movement component, I'm currently using this and it works like 90% of the time but sometimes just failes. With mem breakpoints it looks like my teleport function passes but then character movement component error correction teleports me back to the starting loc

[twilit radish]

The CMC already handles* the teleporting / position replication, you don't want to multicast the teleport but instead just let the server deal with it. Although not entirely sure why you end up back at the first position unless you're using client authoritative movement.

Also the * is because I believe it doesn't handle predicting teleportation by default on the client, so it will very likely end up in getting corrected for the client. But I may be wrong on that one, someone else may know 🙂

[meager fable]

Client authorative movement is disabled for my cmc and running the event server only results in no tp :/

[clever hound]

1>   Creating library C:\Unreal Projects\ProjectVR\Intermediate\Build\Win64\UnrealEditor\Development\ProjectVR\UnrealEditor-ProjectVR.suppressed.lib and object C:\Unreal Projects\ProjectVR\Intermediate\Build\Win64\UnrealEditor\Development\ProjectVR\UnrealEditor-ProjectVR.suppressed.exp

1>PlayerPawn.gen.cpp.obj : error LNK2001: unresolved external symbol "public: virtual void __cdecl APlayerPawn::Client_MoveRight_Implementation(void)" (?Client_MoveRight_Implementation@APlayerPawn@@UEAAXXZ)

1>PlayerPawn.cpp.obj : error LNK2001: unresolved external symbol "public: virtual void __cdecl APlayerPawn::Client_MoveRight_Implementation(void)" (?Client_MoveRight_Implementation@APlayerPawn@@UEAAXXZ)

Wtf are these scary looking errors

[twilit radish]

These are both not checked in the movement component?

[meager fable]

yup

[twilit radish]

What exactly are you trying to do?

[clever hound]

UPROPERTY()
        FVector NewLocation;

//Movement 
void APlayerPawn::Server_MoveForward_Implementation(float AxisValue)
{
    //MovementDirection.X = FMath::Clamp(AxisValue, -1.0f, 1.0f);

    if (Controller != nullptr && AxisValue != 0.f)
    {
        const FRotator Rotation(0.f, HeadCamera->GetComponentRotation().Yaw, 0.f);

        NewLocation = GetActorLocation() + FRotationMatrix(Rotation).GetUnitAxis(EAxis::X) * AxisValue * MovementSpeed;
        SetActorLocation(NewLocation);

        UE_LOG(LogTemp, Warning, TEXT("%f"), AxisValue);

        Client_MoveForward();
    }
}

void APlayerPawn::Client_MoveForward()
{
    SetActorLocation(NewLocation);
}

[twilit radish]

What do your character's replication settings look like?

[twilit radish]

Is client move forward a RPC?

[clever hound]

Yes

Should it not be

[twilit radish]

You're missing the _Implementation part in the declaration then.

[clever hound]

Ah fuck me how did I miss that ty

[twilit radish]

🙂

[twilit radish]

Just gave it a try with this simple setup. Works just fine for me, maybe try quickly creating a new character and see if that one does work I guess?

Also it does not actually say it fails to teleport in your logs right? Just making sure 😛

[meager fable]

nope, tp suceeds :p

okay, this works on a new character

but not on my old one

[twilit radish]

Try comparing the two and see what's different I guess, I'm not entirely sure at this point my self what exactly might mess it up. Worst case you could try rebuilding your character with the new one and see if it still works or breaks at some point.

[meager fable]

Okay, someone put this on begin play

https://tenor.com/view/seth-meyers-witch-hunt-late-night-seth-lnsm-lnsmgi-fs-gif-9201107

[twilit radish]

Well.. Yes, that pretty much answers it lol.

[verbal tendon]

They forgot another few settings

Just make client fully authorative, ignore checks on server

whatever problem you were experiencing, is fixed now! 🎉

[meager fable]

https://tenor.com/view/book-of-boba-fett-the-mandalorian-this-is-the-way-the-book-of-boba-fett-mandalorian-gif-24825263

[twilit radish]

I mean depending on your game it might be better IMO as you don't have to deal with first of all complicated net code, then also packet loss becomes like essentially no issue and interactions in general may feel a lot better (bumping into others for example). But there are definitely some downsides to it and it's absolutely not right for all projects either.

[clear island]

@clever hound using replication there does not guarantee it reaches the client before that client rpc is called

you can send it in the client rpc itself instead

[clever hound]

Do you mean that I would calculate the NewLocation in the ClientRPC and then use the SetActorLocation() in serverRPC

[clear island]

no, in the server rpc, the place where you are setting NewLocation and calling the client rpc, you send that as a function parameter : Client_MoveForward(NewLocation)

[cold moat]

stupid questions time: if i spawn actor only on the server, but set it to replicate, does it get "spawned-via-replication" on simulated proxies too? (assuming it is NetRelevant)

[twilit radish]

It gets replicated to all that are relevant yes. If anything that's the only way to do it as a client doesn't have the authority to spawn a replicated actor (will just spawn it locally for them).

[cold moat]

thanks, i tend to have weird ass questions that consfuse google, it really helps when Real People answer ❤️

[clever hound]

UFUNCTION(Client, Reliable)
        void Client_MoveForward(FVector NewLocation);```
```cpp
//Movement 
void APlayerPawn::Server_MoveForward_Implementation(float AxisValue)
{
    //MovementDirection.X = FMath::Clamp(AxisValue, -1.0f, 1.0f);

    if (Controller != nullptr && AxisValue != 0.f)
    {
        const FRotator Rotation(0.f, HeadCamera->GetComponentRotation().Yaw, 0.f);

        NewLocation = GetActorLocation() + FRotationMatrix(Rotation).GetUnitAxis(EAxis::X) * AxisValue * MovementSpeed;
        SetActorLocation(NewLocation);

        UE_LOG(LogTemp, Warning, TEXT("%f"), AxisValue);

        Client_MoveForward(NewLocation);

        UE_LOG(LogTemp, Warning, TEXT("%s"), *NewLocation.ToString());
        
    }
}

void APlayerPawn::Client_MoveForward_Implementation(FVector NewLocation)
{
    UE_LOG(LogTemp, Warning, TEXT("%s"), *NewLocation.ToString());

    SetActorLocation(NewLocation);
}

I might be just stupid because I still dont get it

[clear island]

is the value not the same?

should be

or close atleast

also you're missing FVector there

you put it in the declaration on the header file (.h), but not the implementation (.cpp)

[clever hound]

1>C:\Unreal Projects\ProjectVR\Source\ProjectVR\PlayerPawn.h(83): error : Function parameter: 'NewLocation' cannot be defined in 'Client_MoveForward' as it is already defined in scope 'APlayerPawn' (shadowing is not allowed)

[twilit radish]

Would absolutely recommend trying to 'practice' that though, it's an absolutely invaluable skill to know how to find answers on Google as an example. There's not always going to be an answer in here for everything, people do other stuff too. But a lot of the time there are also entire (sometimes even better) answers out there on for example the docs 🙂

[clear island]

yes you are missing FVector there

[clever hound]

Fixed that. I tried both

[clear island]

in that .cpp function

[clever hound]

void APlayerPawn::Client_MoveForward_Implementation(FVector NewLocation) this?

[clear island]

yep

[clever hound]

its there

[clever hound]

Got that after it

[twilit radish]

You already have a member variable with that name. You can't do that.

Give the RPC variable name a different name 😛

[clear island]

oh yea thats right

you have a "global" variable called NewLocation and also a local one with the same name

[cold moat]

yeah i do try to google all the time, usually though some things turns out i confuse/commingle two things and google is completely lost too

[clever hound]

UPROPERTY()
        FVector NewClientLocation;```
```cpp
//Movement 
//Movement 
void APlayerPawn::Server_MoveForward_Implementation(float AxisValue)
{
    //MovementDirection.X = FMath::Clamp(AxisValue, -1.0f, 1.0f);

    if (Controller != nullptr && AxisValue != 0.f)
    {
        const FRotator Rotation(0.f, HeadCamera->GetComponentRotation().Yaw, 0.f);

        const FVector NewLocation = GetActorLocation() + FRotationMatrix(Rotation).GetUnitAxis(EAxis::X) * AxisValue * MovementSpeed;
        SetActorLocation(NewLocation);

        UE_LOG(LogTemp, Warning, TEXT("%f"), AxisValue);

        FVector NewClientLocation = NewLocation;

        Client_MoveForward(NewClientLocation);

        UE_LOG(LogTemp, Warning, TEXT("%s"), *NewLocation.ToString());
        
    }
}

void APlayerPawn::Client_MoveForward_Implementation(FVector NewClientLocation)
{
    UE_LOG(LogTemp, Warning, TEXT("%s"), *NewLocation.ToString());

    SetActorLocation(NewClientLocation);
}

🤔 🤔 🤔 🤔 🤔 🤔 🤔 Idk maaan this is so weird that it still does not want to work
I made the NewLocation "const FVector"

[clear island]

you're using NewLocation in your UE_LOG

[twilit radish]

@clever hound Don't let your NewClientLocation

UPROPERTY()
FVector NewClientLocation;
```and
```cpp
void APlayerPawn::Client_MoveForward_Implementation(FVector NewClientLocation)
```have the same name.

[clear island]

I think you want to print the parameter instead

[cold moat]

How could i "sync" up autonomous proxy spawned grenade actor to a server one? (obviously keeping the server one authoritative) Or is this a path to jank and tears and/or tons of interpolation and I should just rely on server spawning one and hope for the best (it would look kinda goofy because we have tons of players that play from US on EU servers and vice versa)

[twilit radish]

That too.

[clear island]

but also yes, you'll have the same problem with that code, 2 variables with the same name

[clever hound]

Would it be smarter then to just replicate the variable with virtual void GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const override Or would it cost too much ?

[clear island]

replicating does not guarantee it will arrive before that client rpc is called

the client rpc could be called but the new value may not have been replicated yet

if you want to use replicated variables you'd remove the client rpc and use rep notifies instead

[clever hound]

//Movement 
void APlayerPawn::Server_MoveForward_Implementation(float AxisValue)
{
    //MovementDirection.X = FMath::Clamp(AxisValue, -1.0f, 1.0f);

    if (Controller != nullptr && AxisValue != 0.f)
    {
        const FRotator Rotation(0.f, HeadCamera->GetComponentRotation().Yaw, 0.f);

        Location1 = GetActorLocation() + FRotationMatrix(Rotation).GetUnitAxis(EAxis::X) * AxisValue * MovementSpeed;
        SetActorLocation(Location1);

       
        UE_LOG(LogTemp, Warning, TEXT("%f"), AxisValue);

        FVector Location2 = Location1;

        Client_MoveForward(Location2);


        UE_LOG(LogTemp, Warning, TEXT("%s"), *Location1.ToString());
        
    }
}

void APlayerPawn::Client_MoveForward_Implementation(FVector Location2)
{
    UE_LOG(LogTemp, Warning, TEXT("%s"), *Location2.ToString());

    SetActorLocation(Location2);
}

    UPROPERTY()
        FVector Location1;

    UFUNCTION(Client, Reliable)
        void Client_MoveForward(FVector Location2);```
But how does the Location 1 value turn into location 2 then

[twilit radish]

It's a bit of a pain honestly because of latency. The problem is if you don't predict the autonomous grenade then it's going to lag potentially behind quite a lot because the server needs to spawn the actor and then also replicate it (which may not necessarily happen directly) + of course whatever latency applies to that. The general concept I believe I've seen used is to spawn a local version for the person who threw it and then just have the server spawn a replicated actor but not replicate it to them (except perhaps the explosion?) and then have the server just explode it whenever you want to keep authority. But tbh most games have a horrible grenade throw system regardless because of this, there's always going to be the problem that a different client gets less time to react to the explosion than whoever threw it because of latency.

I believe there's also a video about a GDC talk from Bungie (creators of Halo) where they discuss some of this stuff somewhere in the channel pins.

[cold moat]

im mostly worried about issues of "my grenade bounced off the tree to the left on the client but it went right on the server"

[thin stratus]

You actually sync them up tbh

[clever hound]

What do you mean by that?

[twilit radish]

You're assigning location1 to location2 and passing that to the RPC. Not quite sure what the problem / question with that is 😄

[thin stratus]

Iirc you throw the local one and tell the Server when. With the Latency in mind, the Server would spawn the Grenade where the Client's version currently is and test everything in between with a traces.
Once the Server version replicates to the Client, you hook them up and remove the predicted one

[clear island]

disregard that, that was about your previous problem

[thin stratus]

Something something, Unreal Tournament

[twilit radish]

That really depends on your design though as this is giving even less reaction time to other people if you're spawning it based on the thrower's 'location', maybe more accurate for the thrower but a lot less accurate for others.

But mine was not meant as a "this is THE way to go" 😛

[cold moat]

it sounds like a bit of a nightmare

[thin stratus]

One person always loses this

[cold moat]

i think a bit of an issue might come from the game being ported off HL2 and their weird netcode

[clear island]

@clever hound it seems you're misunderstanding some of the basics:

• Client RPCs are called from the server but executed on the client
• Server RPCs are usually called from the client but executed on the server

you can also call server rpc's on the server

but they will only be called on the server

[clever hound]

I know that

[clear island]

in your code, on the server, you are calling a ClientRPC with a FVector as parameter, so you're sending that FVector value from server to client

[cold moat]

We really want to improve overall performance, because the game is at least 64 player multiplayer, with tons of projectiles flying about, so i cant do crazy logic either

projectiles as in grenades and shells, not bullets

[clever hound]

But if I can't get it from the server how do I make it happen then? Do I calculate the location on the Client_MoveForward() and call Server_MoveForward() inside that?

So it would be other way around. Would it have the same problem

[clear island]

I dont understand what you're trying to do, but usually when it comes to movement you do it on the client first then send a server rpc to do it on the server

[twilit radish]

I mean to be fair with that amount of players you're already quickly getting into more advanced topics regardless as that's a lot of players. Especially if it's "at least 64". At that point you're much better off profiling your networking and general performance.

Rather difficult for us to say what fits within your performance budget and what doesn't. Which depends on the implementation of things either way I suppose.

[prisma snow]

In scenario with no prediction and given that the grenade doesn't interact with other objects, would you consider pre-calculating the grenade movement in the server and sending it to the clients so that it is consistent?

[thin stratus]

I think it's probably best to just not predict those. At least not unless you really need to cause it visibly spawns too late. I would go from the pov of making it best for the local client who throws it

But this can get complex pretty quickly

UE I lacking a really good base implementation of predictively spawning actors and rewinding a set of actors

[prisma snow]

Yeah that makes sense

[prisma snow]

I see. I would say that generally speaking prediction for general use cases is difficult

The only system that I know with very good general purpose prediction would be deterministic lockstep rollbacks

[twilit radish]

Lockstep is absolutely not suitable for a whole lot of games though 😅

[prisma snow]

Yeah, and even if it was it would be a pain to develop

[cold moat]

Hl2 uses rollbacks right

[prisma snow]

no idea, also rollback is a very wide term so sometimes I don't even know what they are referring to. I usually mean fight games-like rollback

[earnest comet]

Hello everyone, smol question if I may!

I recently starting to learn multiplayer.

I was wondering if blueprint interface events can't be used in multiplayer?

There are no replication options for them from what I understand, I just want to confirm. Thanks!

[cold moat]

well, turns out im kinda re-making the "anything that isnt a bullet" system from the ground up, so im mostly just sitting on my ass and thinking about what would make sense and what wouldnt lol

and i dont really have much experience...so thats suboptimal xD

[lucid viper]

Hello!

Might be a noob question but im trying to understand the Anim graph and replication. My Walking and Running blendspace animation is replicated but not my Sprinting.

I created a anim instance cpp, created a bool for Sprinting so I am guessing that I need to manually replicate this across all clients somehow. But why not just use the wame Walk/Run blendspace for Sprinting? I currently have the walk/Run blended with an aiming upper body animation. I prefer the full body sprint like Fornite.

So my understanding to replicate my value across all clients I need to setup a few things in my header:

UPROPERTY(Replicated, BlueprintReadOnly, Category = Movement, meta = (AllowPrivateAccess = "true"))
bool IsSprinting;

void GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const override;

Then in my cpp:

#include "Net/UnrealNetwork.h"
void UCustomAnimInstance::GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const
{
    Super::GetLifetimeReplicatedProps(OutLifetimeProps);
    DOREPLIFETIME(UCustomAnimInstance, IsSprinting);
}

Is that it or do I need to create a server_implementation and multicast functions as well?

[winged badger]

Anim instances dont normally replicate

And they also shouldnt

Put you bIsSprinting in the character and replicate it there, then pull it into anim instance UpdateAnimation

[lucid viper]

Ah interesting, so if I set something like IsSprinting = Character->IsSprinting; in my UpdateAnimation. As long as my character variable is properly replicated, then it should sync up correctly with my anim instance?

Also to make sure im doing the replication correctly. I would then setup my character header like so:

UPROPERTY(Replicated))
bool IsSprinting;

void GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const override;

Then in my cpp:

#include "Net/UnrealNetwork.h"
void UCustomAnimInstance::GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const
{
    Super::GetLifetimeReplicatedProps(OutLifetimeProps);
    DOREPLIFETIME(UCustomAnimInstance, IsSprinting);
}

Would this be all I need or do I also need to include a On_REP, Server_Impl and or Multicast function?

I get al these 3 confused

[winged badger]

Yes for replicating sprinting through charactet

No, mostly, for everything else you just asked

[lucid viper]

kk thx for the info, really appreciated 🙂

[winged badger]

For RPCs

2 functions need to be implemented, and subobject calling RPCs doesnt need to be replicated at all, only its actor doed

GetLocalFunctionCallspace and i think CallRemoteFunction

For server/client RPCs additionally actor owner needs to be owned by the player controller

For OnReps you need to use ReplicatedUsing and object itself, as well as its actor owner need to be replucated, and you need to declsre and define OnRep function

[hardy monolith]

Hello! I'm looking for a way to read custom arguments when a client joins the server. I already do it for the host, but it's unclear how to do it for the client. I'm attaching an example of how I set arguments 🙂

[twilit radish]

Pretty sure it's not possible from blueprints to retrieve those values for a client, they are stored inside a class that doesn't expose the variable (the net connection) to blueprints and the moments it gets passed on in the beginning in for example the game mode it does not seem to get passed on to blueprints either.

So you'll either need to use C++ for this or you'll need to use a different solution. You could for example RPC the data up to the server in the player controller, but definitely not ideal yeah :/

[quasi tide]

Isn't there a parse options node?

[twilit radish]

But how do you want to parse it when you can't access it from BPs?

Unless I'm just stupid I guess xD

[quasi tide]

Pretty sure you can. You do it in OnPostLogin or something like that. I can't recall exactly.

[twilit radish]

That's where the fun part begins, gamemode indeed has those parameters but does not pass them onto the BP events and the actual method is not a ufunction you can implement.

[quasi tide]

I just found it annoying, so I just RPC that stuff to the server, lol

I don't care. Co-op for the win.

Alleviates A LOT of stuff some people have to worry about, lol

[twilit radish]

It's pretty simple in C++ to access but it's really poorly exposed to BPs. As in just not.

[quasi tide]

Most things actually end up being pretty simple in C++ honestly. Considering most of the engine is opened up for you, lol.

[twilit radish]

Also I think this is the node you're talking about btw: https://docs.unrealengine.com/4.27/en-US/BlueprintAPI/GameOptions/ParseOption/

But you need the FString for it. Which you can't get.

Also to be honest the only reason I know how to access it is because there was someone we spend half an hour searching with to find a way to grab that stupid connection string from C++ x)

[hardy monolith]

I use it on server side in GameMode, but this won't work for Client

Okay, let's then refrase question

When my player joins server, the get join menu and I would like them to be able to customize some parameters, like color of their pawn.
I already made UI to select the value, and now I need to pass it from Client to Server when joined

[twilit radish]

I would just use the same way Durox just described, basically you temporarily save that data in somewhere like the game instance as that persists throughout world changes and then when you've joined the server you can send a RPC to the server with the data you want to send.

[hardy monolith]

Yeah, true, but I wanted to prototype everything in Blueprint before moving to C++

Big downside of C++ that many times it makes engine crash, which consumes a lot of time

[twilit radish]

What I just described is completely possible in BPs 🙂

[hardy monolith]

I was just reading back your discussion, sorry 😁

[hardy monolith]

That's dirty as hell, but will work for a start

If I ever get back to refactoring this, haha

Is there a way to create custom persistent actor?

[twilit radish]

I mean.. The engine is sometimes just not leaving you with a whole lot of choices when it comes to blueprints and multiplayer 😅
With C++ too at times I suppose, but that can be more easily solved with a source build.

[hardy monolith]

I'm always thinking about ways to create more general tools to solve such problems

[twilit radish]

Actors aren't really meant to persist like this. There are "subsystems" however that have various life times, although I have absolutely no clue if they in specific exist in BPs.

But anything that persists data beyond a world change should work I suppose. As long as you can access it when you need the data again to send to the server.

[honest rain]

Hello hello Slackers !
I am trying to understand how OnRepNotify works, but I can't get past the compiling when I am trying to implement the function in my .h file 😦
I am doing this :

        TObjectPtr<UMaterialInterface> Material;

    UFUNCTION()
        void OnRep_MaterialUpdated();

yet this won't compile and it would say that external symbol is non resolved. I checked the naming and it seems fine :/ any idea ?

[twilit radish]

Show your compiler output 🙂
Also I don't think there's much point in replicating a pointer to a material interface in the first place. But I could perhaps be wrong in that.

[honest rain]

I am trying to set a material on an actor server side, and I want to replicate this to the client whenever the material would be updated 🙂
I just succeeded compiling by adding

{
    DOREPLIFETIME(AActor, Owner);
}

although I am not totally understanding why, and its not clearly said in the documentation why we need this

[twilit radish]

You should call the super on that btw, otherwise the actor it self isn't going to replicate properly.

The reason that method exists is so you can specify exactly how you want to replicate certain properties, there's more dynamic stuff to that if you need it as well but it basically just maps out what properties to use and how.

[honest rain]

I see, thanks 🙂

Can't run unreal now that I added this xD It will throw a assertion failed error at initialization hum/
Here is my chunk.cpp file :

{
    UE_LOG(LogTemp, Log, TEXT("MATERIAL CHANGED"));
}

void AChunk::GetLifetimeReplicatedProps(TArray< FLifetimeProperty >& OutLifetimeProps) const
{
    Super::GetLifetimeReplicatedProps(OutLifetimeProps);
    DOREPLIFETIME(AActor, Owner);
}

.h file :

        TObjectPtr<UMaterialInterface> Material;

    UFUNCTION()

        void OnRep_MaterialUpdated();

[twilit radish]

I totally did not look at what you were actually replicating in the DOREPLIFETIME, but you don't want to set the Owner in there. It's already being taken care of by the actual engine so need to do that your self. You would instead use whatever variable you made your self.

So for example:

 DOREPLIFETIME(AChunk, Material);

[honest rain]

oooh I understand, that makes sense

[twilit radish]

But I'm still not sure if Material will work honestly. Normally the way you do this stuff is by having a 'look up table' as I have seen it been named before. There's no reason to try and replicate entire objects most of the time like materials and a lot of objects don't even support this in the first place. The better way to do this is to replicate for example an ID or a name or whatever fits in that use case and then use that to find the material.

[honest rain]

The thing is I am setting the Material from a manager that spawns the Actor. It does set the material, but server side only, I figured it would be only simpler to just replicate that material set to the client while setting it on the server

[twilit radish]

Well in this case you're only printing a message when the OnRep gets triggered. So it's indeed not going to do much else than printing that message 😛

[honest rain]

that's... true lol

[lucid viper]

Hey guys,

Struggling to replicate my Sprinting bool. I want to use this bool for my animation instance to then control my sprinting animation across all clients. This is what I got so far in my Custom Character source file:

void ACustomCharacter::GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const
{
    Super::GetLifetimeReplicatedProps(OutLifetimeProps);
    DOREPLIFETIME(ACustomCharacter, IsSprinting);
    //DOREPLIFETIME(ACustomCharacter, bIsInAir);
}

void ACustomCharacter::OnRep_Sprinting()
{
    if (IsLocallyControlled())
    {
        IsSprinting = CustomMovementComponent->Safe_bWantsToSprint;
    }
}

void ACustomCharacter::SetSprinting(bool bNewSprinting )
{
    IsSprinting = bNewSprinting;
    ServerSetSprinting(bNewSprinting);

    if (bNewSprinting) {
        if (CustomMovementComponent) {
            CustomMovementComponent->SprintPressed();
        }
    }
    else {
        if (CustomMovementComponent) {
            CustomMovementComponent->SprintReleased();
        }
    }
}

void ACustomCharacter::ServerSetSprinting_Implementation(bool bNewSprinting) {

    IsSprinting = bNewSprinting;
}

void ACustomCharacter::SprintPressed()
{
    SetSprinting(true);
}

void ACustomCharacter::SprintReleased()
{
    SetSprinting(false);
}

Its still not replicating and I dont understand what im missing

Even ChatGPT spit out a very similair output lol

[honest rain]

I found that chatGPT gives a lot of times not complete informations, especially about replication stuff 😛

[clear island]

you need to remove the "IsLocallyControlled" part from the OnRep_Sprinting

[twilit radish]

ChatGPT has absolutely no concept of context when it comes to Unreal. It may be cool for general concepts to be explained or whatever but it's absolutely horrible for direct implementations.

[clear island]

or more like, negate that

you probably want !IsLocallyControlled()

[twilit radish]

I don't see why the entire IsLocallyControlled is needed in the first place. If you don't want it to be called on something that's for example locally controlled just skip the owner in the replication 🙂

[clear island]

or use skip owner condition with DOREPLIFETIME

[honest rain]

well I just added Mesh->SetMaterial(0, Material); inside my OnRep function, now the material is correctly set both client and server side 🤷‍♂️ thats awesome, except you raised a good point and I don't really get why it's working

[twilit radish]

I guess the engine can link them up in this case through a net ID / name or whatever. But it's still advice in general, not everything will work like that. An example is dynamic materials for example, they don't replicate their properties when you do it like this and the entire thing it self doesn't even replicate either.

[karmic jacinth]

Is is possible to make an homing projectile work in a networked way?

[honest rain]

I see, so ideally I would create a variable server side referring to the material, then ask for this variable from the client whenever needed ?

[honest rain]

you mean replicated ?

[karmic jacinth]

It does replicate but only seem to apply the base speed of it and not the direction. I tried adding "replicate Movement" but the experience is terrible.

[twilit radish]

I guess it's fine in this specific case? But just depends. Not entirely sure what material does under the hood 😛

[honest rain]

thanks for your help !

[twilit radish]

Replicate movement is a horrible experience in general yes, if you're not using any physics based actor it just directly sets the location etc. 😅

Or not using the character system*

[karmic jacinth]

Should I not use homing projectile and use my own predictive code maybe?

Because I just wanted to prototype something

[twilit radish]

I've not in specific used that, so I'm not sure what it does or doesn't do.

[karmic jacinth]

Oh wait I'm setting the target after the spawn so this part doesn't get replicated.

Ok it is working now! I'm setting the target as a Replicated variable that I pass to the Projectile and I set the homing target in the begin play.

[glad escarp]

Hey dudes. Any local multiplayer gurus out there? I'm using Create Local Players to spawn additional players (In GameMode) but I can only get it to spawn one additional player. When I add more it doesn't add a player 3 or 4. Anyone know why?

[twilit radish]

Sorry @honest rain need to correct a mistake I made here. In general there are objects that are perfectly fine to be used like the way you did it. This is because the engine basically knows how to find them because it maps it in a certain way and it's available on both the client and server, so for example your material it can find. I'm not 100% sure how much network overhead this has compared to a simple ID or whatever but that doesn't really matter for now I suppose. That being said there are definitely still a lot of scenarios where this isn't the case or where the properties of something may not replicate over the network. But wanted to correct my mistake here 🙂

If you're interested here's some more info: https://docs.unrealengine.com/4.27/en-US/InteractiveExperiences/Networking/Actors/Properties/ObjectReferences/

[dark edge]

Same controller ID i'd guess

[glad escarp]

Isn't that the point of using -1? To get the next available id?

[glad escarp]

well no matter what it's supposed to do, sure as shit that worked. I just assigned them to 1, 2 and 3 and that worked

[earnest comet]

Hello folks, is there any tutorial, guide, docs about how to handle desync issues? I am testing my netcode with network emulation and everything is wrong if I have 200 ms. Any help is appreciated! Thanks!

[dark edge]

What's the general shape of your netcode? You doing any prediction stuff?

[earnest comet]

Well I am at ultra mega beginning stage, changing a flipbook's animaton (paper2D) to another one. Sure all is fine at 0ms but when it is <0ms, host instantly changes animation but delayed on client side while when client changes its animation it is delayed too but host sees the change first.

Basically "what am I doing with my life" stage of things.

I wonder how I can delay the host's flipbook change trigger on its own side according to the lag, while making client's change delayed for host.

Basic desync shenanigans

[lucid viper]

I think I might be screwing up the replication of my bool. I removed the LocalController I had and tried to add a condition to my DOREPLIFETIME but still no luck.

This is my header file:

    void SprintPressed();
    void SprintReleased();
    UPROPERTY(Replicated) bool IsSprinting;

    void SetSprinting(bool bIsSprinting);
    UFUNCTION(Server, Reliable) void ServerSetSprinting(bool bNewSprinting);

This is my character source file:

void ACustomCharacter::GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const
{
    Super::GetLifetimeReplicatedProps(OutLifetimeProps);
    DOREPLIFETIME_CONDITION(ACustomCharacter, IsSprinting, COND_SkipOwner);
}

void ACustomCharacter::OnRep_Sprinting()
{
    if (IsLocallyControlled())
    {
        IsSprinting = CustomMovementComponent->Safe_bWantsToSprint;
    }
}

void ACustomCharacter::SetSprinting(bool bNewSprinting )
{
    IsSprinting = bNewSprinting;
    ServerSetSprinting(bNewSprinting);

    if (bNewSprinting) {
        if (CustomMovementComponent) {
            CustomMovementComponent->SprintPressed();
        }
    }
    else {
        if (CustomMovementComponent) {
            CustomMovementComponent->SprintReleased();
        }
    }
}

void ACustomCharacter::ServerSetSprinting_Implementation(bool bNewSprinting) {

    IsSprinting = bNewSprinting;
}

void ACustomCharacter::SprintPressed()
{
    SetSprinting(true);
}

void ACustomCharacter::SprintReleased()
{
    SetSprinting(false);
}

Quick video showing the issue:

I also added IsSprinting = CustomCharacter->IsSprinting; in my NativeUpdateAnimation from my custom anim instance source.
My understanding is that as long as you replicate it correctly in the character source, technically it should follow / replicate down to my anim graph as well, right?

[wooden abyss]

Hello, I have a question about spawning AI in a multiplayer game. I have an actor in my level that serves as the spawn point for my enemies as well as actually spawning the enemies in waves. The logic of when to spawn an enemy is dealt with in the GameMode. The GameMode triggers the Event of the Actor in specific cases. Is that already enough so that the AI is only spawned on the Server and then replicated to my clients? Right now it works as intended but I just wanna make sure that this is actually not giving me any problems down the road. I would think that if the GameMode calls the Event to spawn AI they should only be spawned on the server cause the Gamemode only exists on the server correct? Even though the Event is implemented in another actor class

[dark edge]

The spawn point exists on server too

Everything but GameMode exists on both

but don't multicast the spawn, instead spawn replicated pawns. Pretty much don't multicast anything except cosmetics

[wooden abyss]

Yeah my pawns are replicated and my Gamemode calls the Spawn Event. So they should only be spawned on server and not on each client correct?

Not using multicast either

This is my actual spawn event

And I call that from the Gamemode

So it should be fine right?

[dark edge]

I would just get Waypoints from the actor and have the gamemode do the work but same thing really

the actors in the level can just be data that the gamemode uses to do the actual spawning

just like PlayerStartActor

it's just there to be a place really

[wooden abyss]

Alright thanks @dark edge !

[clear island]

you still have the IsLocallyControlled() there

remove it

void ACustomCharacter::OnRep_Sprinting()
{
   IsSprinting = CustomMovementComponent->Safe_bWantsToSprint; 
}

I'm not sure you need that CustomMovementComponent->Safe_bWantsToSprint

I think you can leave that completely empty

the value is already being replicated

[lucid viper]

My bad I did remove it in my source and switched the IsSprinting bool to Replicated instead of Replicated using.

Still dosent seem to be working correctly

[clear island]

is that SetSprinting function being called on the server when the server presses the sprint key?

[honest rain]

Thanks a lot for the precision and for your help !!!!

[honest rain]

I will post this just in case someone encounter the same issues I had setting material and vertex colors on ProceduralMeshComponent.
good thing to know : It seems CreateMeshSection is deprecated and should not be used anymore. I am not sure if this is because I couldn't get my vertex color material to work, but I have been using CreateMeshSection_LinearColor instead and it works great.
After your suggestions, I replaced the objectPtr with a UMaterial* Material. I don't think it is making a lot of difference, but I guess both options are viable !

spawning a new actor from worldManager.cpp :

                if (NewActor)
                {
                    AChunk* NewChunk = Cast<AChunk>(NewActor);
                    NewChunk->ChunkW = this;
                    NewChunk->Material = Material;
                    NewChunk->OnRep_MaterialUpdated();
                }```
my actor I spawned.h :
```UPROPERTY(ReplicatedUsing = OnRep_MaterialUpdated, Category = "Chunk", VisibleAnywhere)
        UMaterial* Material;```

actor spawned .cpp:
```    Mesh->CreateMeshSection_LinearColor(
        0,
        FChunkMeshDataVertices,
        FChunkMeshDataTriangles,
        FChunkMeshDataNormals,
        TArray<FVector2D>(),
        vertexColors,
        TArray<FProcMeshTangent>(),
        true);

{
    UE_LOG(LogTemp, Log, TEXT("MATERIAL CHANGED"));
    Mesh->SetMaterial(0, Material);
    
}```
Thanks again for your help 🙂 cheers

[pure mango]

I have an AnimMontage that can spawn actors (AN_Spawn_Actor).
But AnimMontages cannot have events (therefore cannot use RPC).

Can I just stick Server_Spawn_Actor RPC in GameInstance and then just have AN_Spawn_Actor call it?
Or is that messy or is there a better place to put the Server_Spawn_Actor RPC?

[vagrant grail]

Could someone explain to me why on this picture (it'a tutorial) he's using a "Has Authority" if we're already in the gamemode which is on the server ? 🤔

[dark edge]

Because it's a tutorial and most tutorials are ass

[deep shore]

If I uncheck the “simulate physics on dedicated server” option for a character mesh, but multicast “set simulate physics”, will ragdolls still occur for clients? it’s not important that the simulations match at all.

[kindred widget]

Personally, I would recommend ditching the idea of branching on the Sprinting bool in your animbp and rely on speed instead. Sprinting is just a specific condition that enables faster speed.

Currently you'll have problems later if you say... add movement speed abilities that increase speeds. You'll have a character walking at the same speed you normally sprint and because you're not "Sprinting", it'll still play the slower walk animation.

Sprinting should be viewed as an ability. Enable and disable. It's affect is to increase speed and that's it. AnimBP shouldn't care about the source of the speed.

[arctic minnow]

Whats replicated wrong with this?

🙂 🙂

🙂 🙂

[dark edge]

Wtf are you trying to do here?

[chrome bay]

#gameplay-ability-system

[twilit radish]

If you have any specific questions you can ask them here or In #gameplay-ability-system for GAS. But if you're looking for people to help you out on the entire game this is definitely not the place. That's something for the job board.

[native tapir]

SRRY guys

[real ridge]

guys any ideas why my dynamicall healthabrs not working? should I RPC those player variable? idk if its ok to rpc inside widget

[chrome bay]

It's not. Widget should just be reading from some variable on the player or whatever

Also you're just setting the colour, nothing else

[real ridge]

do you see that second photo ? I am seding there reference of self which contains team

and then I am comparing send player + locall player

[prisma snow]

Widgets are UObjects, don't have replication capabilities. Only actors do

Also it would be a bad idea to have them do it, widgets are not game logic

I'd suggest you to handle health etc in a character or pawn component and do the RPCs or replicate health through them

[real ridge]

idk how to then make this dynamical health bar 😄 I am shocked noone cant find anything regard to this theme and its in every game

kekw

[real ridge]

but wdym about my comparation inside widget cant work?

[prisma snow]

we are telling you how to do it literally

Widgets are not objects that should store gameplay values such as health

You need to use actors and components to do that

and then update the widgets to show the health from the component

Your comparison only compares the variable Player to the PlayerPawn and their team IDs

For such comparison I'd made sure that the teams are correctly setup and that the references you compare do correspond to your player and the others

I think there are several layers of problems so take it slowly and do it properly from the beginning

[real ridge]

it's set correctly but peoblem is peopably that I am comparing in widget because I am sending there player pawn and compare it there with local player but as widget is only local it compares propably same person

and I bet I can't send replicated variable to widgets of all

so it's not working now

[serene furnace]

hello, I have some trouble with this, anyone can think of something, my Rep notify turns to run on the server only if I use this node, if I remove it, is replicates properly, I thought it my be linked to the fact that my "item master" is replicated actor, but if I make it not replicated, the rep notify fires only on server still.

I tryed "has Authority switch" and Authority is firing properly the Rep notify, meaning that its the server that is firing the rep notify, but things are still not sent to client, im out of idea 😦

[prisma snow]

exactly, the comparison is not properly setup

[prisma snow]

you need to replicate through an actor and then set the replicated variables on the UI

I'd really advise you to read the Network compendiums and learn multiplayer basis properly

[kindred widget]

The comparison is fine. If it's not working, it's because the variable is not replicated correctly.

There's nothing wrong with the widget's logic. The issue is that Team is not correctly set on the character.

[rose pollen]

I just put my game on steam to test, it is multiplayer with a dedicated server and I made a completely empty entry level for the client default map that just calls load level by name on the server ip. When I navigate to my executable in Steam > steamapps > common > mygame and double click the exe it loads and connects to the server perfectly, but when i click "play" in steam it just sits on the loading screen and doesn't connect to the server. Does anyone know what the difference between clicking "play" and double clicking the executable is? my launch options are set to the bare minimum i think.

[serene furnace]

Yeah you were right, I tested a few other things tho to optimised, but yeah as long as my "Item Your interacting with" was not replicated It would not work ^^

[stoic lake]

Hi, is it possible to multicast a function?

[twilit radish]

Would recommend checking your logs, could be a lot. Most obvious thing that comes to mind to check is if your steam overlay works if you're directly launching from the exe versus if it does when launching through Steam. Could indicate that Steam is not properly being initialized for example.

[stoic lake]

instead of having to use a custom event

[twilit radish]

I believe you can't in BPs. You can however just immediately make it call your own function.

But not 100% sure, couldn't find anything for it though.

[stoic lake]

what do you mean exactly?

[twilit radish]

As in just directly call a function to handle the implementation when the event gets triggered.

Not ideal, but better than nothing I suppose.

[stoic lake]

would this be good practice? The play sound function also plays the sound, not sure if that's nessecary, or if just the MC plays the sound for all clients

this is what's inside the playsound function

[twilit radish]

A multicast triggers for everyone that's relevant for the actor. That includes the server. So you're likely playing the sound twice now on the server.

[stoic lake]

Alright

thanks

so this, and then the multicast would suffice?

[twilit radish]

Would definitely give it a try, but seems fine.

[stoic lake]

👍

[rose pollen]

hmm, the steam overlay does appear when i click play and steam and does not when i double click the exe so will start there, thanks

[stoic lake]

how bad is this in terms of performance?

/ is a multicast set to reliable hooked up to a tick performance heavy?

or bad practice

[rose pollen]

others here a lot more experienced than I so maybe someone will disagree, but I don't think its great performance wise, generally you want the actor running as an simulated proxy on the clients when possible, so have some minimal replicated stated that is enough for your piano to know what it should be animating and then let it animate all of that client side

so something like two replicated ints that are the start and end of the loop you have there, you update those server side

the piano just knows client side it should be playing from the start to the end

[prisma snow]

probably not super heavy (unless multiple instances are doing it at the same time) but I wouldn't do a reliable multicast per tick, the worse case scenario would be to skip one update if the packet gets lost

[stoic lake]

the for loop check every key's current value in the animation curve, so having just the first and last index wouldn't be possible

[stoic lake]

I now have it set up where the tick only runs when there is an animation playing, which lasts for 0,4 seconds. Is that still not optimal or a lot better?

[prisma snow]

it's better

still why reliable? what is the worse case scenario if an update is missing?

[rose pollen]

can still just replicate the key state, but for 0.4s maybe doesn't matter unless you have a lot of them. I think general pattern of replicating state not animation is better practice

[stoic lake]

You mean just ticking replicate movement in the details panel?

or replicate component*

[stoic lake]

When I spam keys on the server, the clients keys get out of sync and eventually get displaced. I'll send a screenshot

[prisma snow]

that shouldn't happen unless updates depend on each other

[stoic lake]

making the mc reliable fixes this issue

[stoic lake]

what do you mean exactly?

[prisma snow]

sorry but a screenshot gives little information nor context.

Reliable RPCs are slower than unreliable ones and there is a risk (although probs not high in this case) to overflow the buffer

[prisma snow]

Idk what are you exactly RPCing, but if those are events such as "key x pressed" an unreliable RPC that misses will just skip that event (bcs it doesn't reach a client). The next ones would be ok

[twilit radish]

To answer this. It's an absolute horrible idea to run any sort of RPC functions reliably on tick. The reason for this is that Unreal has to make sure that they actually arrive and has to do so in order too, when you're doing this on tick you're very quickly overflowing the reliable buffer Unreal uses with the slightest amount of packet loss. Which becomes an even bigger issue as soon as you get more connected clients, what if 2 clients drop a packet for example? Then Unreal has to resend them again.

This is an issue because Unreal will drop clients where this becomes the case as it can at some point not recover from sending all these packets any more because too many stacked up. This is from a test I ran quickly:

[2023.02.15-14.36.03:529][773]LogNet: NMT_CloseReason: (Server Disconnect Reasons) 127.0.0.1:17777
[2023.02.15-14.36.03:529][773]LogNet: - RPCReliableBufferOverflow
[2023.02.15-14.36.03:529][773]LogNet: UNetConnection::SendCloseReason:
[2023.02.15-14.36.03:529][773]LogNet: - Result=FailureReceived, ErrorContext="FailureReceived"
[2023.02.15-14.36.03:530][773]LogNet: Error: UEngine::BroadcastNetworkFailure: FailureType = FailureReceived, ErrorString = Outgoing reliable buffer overflow, Driver = GameNetDriver IpNetDriver_0
[2023.02.15-14.36.03:530][773]LogNet: Warning: Network Failure: GameNetDriver[FailureReceived]: Outgoing reliable buffer overflow

[prisma snow]

BTW you are not doing one multicast per tick, you are doing 88

[prisma snow]

I didn't see the loop before, this is terrible performance wise

[stoic lake]

I have a curve set up, every key has a value mapped to it, this value means how far along it is in the curve. The tick basically checks which keys' values are currently below the length of the curves and adds the deltatime to the current value.

[rose pollen]

no i mean replicate an array of which keys are down, make a variable like "keys down" that is a list of ints

[stoic lake]

and then just lerping between 2 positions based on the position in the curve

[prisma snow]

that is an animation and should not be replicated at all

[prisma snow]

exactly

replicate only key up and down events

[stoic lake]

that's basically what's happening right now. It's only doing the multicast on the keys that are down atm

[prisma snow]

the exact position of the key doesn't need to he replicated

[prisma snow]

no, you are multicasting 88 transforms everytime

each transform being 9 floats

[stoic lake]

I added this variable to make sure it only multicasts when the key is being played

[stoic lake]

Yeah I worried this was the case

[stoic lake]

The tick updates all the notes positions by a slight amount along the curve every time and only of the notes that are currently pressed basically

[prisma snow]

I know but it's a really bad idea

[stoic lake]

because doing this with a timeline was impossible as I am using instanced meshes for the keys I had to use a different way to animate multiple keys at the same time

[prisma snow]

two options

either do one RPC with an array of indexes and transforms (still unnecessary)

or RPC significant events such as key up key down, and let the exact curve be calculated in the clients independently

[stoic lake]

alright, and the calculation of the curve would still happen using a tick I suppose

[twilit radish]

The whole transform thing is not going to be fun either way as this will not look smooth on a client regardless. Clients receive packets at inconsistent timing because of latency and packet loss. So the moment you're sending over the entire transform and just apply it immediately it's going to jump to the position/rotation etc. I would very much go with Max's last option.

Saves a ton of unnecessary data and solves the issue of not being smooth in the first place in a really easy way.

[stoic lake]

how do I calculate the position on the clients on a serverside blueprint?

aah wait

I got it

Thanks a lot guys

[twilit radish]

Also why is this just no where easily accessible to find on the internet. See it often enough be the case in here: "Why would I not just mark everything as reliable as it seems important that feature X or Y's RPC calls should arrive." 😄

Not even Cedric's compendium mentions it 😦

Other than "don't do it" I suppose lol.

[rose pollen]

in terms of replicating state I'd look at the example here: https://docs.unrealengine.com/4.27/en-US/Resources/ContentExamples/Networking/1_4/

you use an array of which keys are down (probably only 1-10 ints long at any given time), server sets that array, clients animate them on the repnotify

[prisma snow]

IF the piano thingy is the main part of the game and there is not much else being networked I'd also increase the frequency to something higher than 0.4

[twilit radish]

It really depends on what the use case of this is especially if you remove the transforms though, if it's a random piano somewhere random in the map. Sure replication all the way as no one cares about it. But if this is for example a music festival game or whatever and your piano is the main thing of the game I would use RPCs so you don't get the whole replication frequency system on top of it. Especially if you replace the transforms with "push up/down" events. But in general yes, replicated variables are definitely better suited for stateful events. Just not necessarily always, there are definitely exceptions to it.

[stoic lake]

it's not the frequency, it's the length of the curve

[prisma snow]

also I guess that even if location is technically a state property, it usually changes often enough that it makes sense to consider it eventful

[prisma snow]

I don't follow, then you are indeed sending many RPCs per tick, I understood that you lowered the replication frequency

[rose pollen]

Hypothetically what is best practice for handling things where someone logs in or comes into relevancy range if you are doing rpc @twilit radish , won’t their client not have gotten the last rpc and thus not know the state on load? Having an issue like that right now in my game

[stoic lake]

#blueprint message

I'm not sure if this works but this is the discussion where the idea for the curves and values linked to the keys came from

will probably clear some things up

[prisma snow]

that is totally fine for a local effect

you just need to sync/replicate the start of the curve and the rest is calculated in server and clients without further synchronization

[twilit radish]

If you want to use a RPC to send data when something becomes relevant or someone joins chances are you should have very much likely just used a replicated variable for it. What's the use case?

[stoic lake]

I don't think there's a way to do that with the way this currently works. There is no start event, sorta. The tick just checks if a note has not fully gone through the curve to go back to its initial state yet, and if it hasn't it progresses the curve of that key a slight bit, and then loops over all keys again

[vagrant grail]

Anyone has a really good tutoriel on multiplayer please ?

[stoic lake]

All the key press event does is set the current curve value of that specific key to 0, then tick makes sure it will eventually get back to the end of the curve. which is 0,4 in this case

[stoic lake]

kekdot's tutorial is good

[vagrant grail]

already watched him alot

I need something that goes deeper on the subject

[quasi tide]

Practice practice practice.

Read papers. Watch GDC talks from people who actually have the battle scars of actual networked gameplay

[vagrant grail]

Practice without knowledge is kinda impossible, so I need the knowledge first then I can practice

[vagrant grail]

Link me to papers

[quasi tide]

YT is shit in this regard. It is only going to cover surface level stuff that the docs already cover

Which is fine - if you just prefer videos to learn from

Everyone wants the secret sauce - but the truth of the matter is, you just need to do things.

[quasi tide]

Sure it is. Make a wave based shooter, networked.

Don't even worry about changing levels.

Google the things you don't understand

[vagrant grail]

I prefer youtube tutorials but everytime people told me they were bad tutorials so if it's possible to have a website / paper explaining that it would be good

[quasi tide]

The most important thing - ignore best practices when learning.

You don't understand why they are best practices when you're learning

Make mistakes

Just do what makes sense to you in the context of your game.

Architecture will always be able to be criticized and improved.

[rose pollen]

it is the colored balls shown here: https://www.youtube.com/watch?v=grvt64xG20U&ab_channel=Swordai, when the sword hits a ball it triggers an RPC that updates the colors, what the colors should be in stored in a replicated array, but I am only actually updating the colors visually via RPC which works perfectly except when someone joins the game and wants to interact with a ball

[quasi tide]

The more you work with doing the replication and stuff like that, the more 2nd nature it becomes.

People like Jambax and Zlo didn't become them by sittin' around trying to find a deep resource. They just...made networked games and practiced.

[twilit radish]

Definitely sounds like it should just be a replicated variable to me.

[rose pollen]

Yeah agree will try reworking into that

Was worried it wouldn’t be as responsive to the hits

[twilit radish]

If the actor does not have a high update frequency you can force a net update, that's totally fine in that case I would say. But then you don't have to worry about relevancy / new joiners.

[vagrant grail]

It's impossible for me to do that, I need to learn concepts first then apply it and learn by doing

[quasi tide]

Cedric's compendium is all you need.

Covers all the concepts for networking in UE.

[rose pollen]

How do you force update?

[twilit radish]

Is this C++ or BP?

[quasi tide]

Specific tricks (like prediction, rollback, etc..), it won't cover. Because those are game-specific.

It does cover everything you need though.

[twilit radish]

As in, for beginning yes. That's what I meant.

I just worded it badly xD

[real ridge]

guys how it is possible I am destroying actor after game over but in menu i still can shoot and I hear shooting behind screen when I push mouse 😄

[twilit radish]

If you're just beginning, Cedric's compendium covers basically everything you need yes.

[rose pollen]

this part is bp

[twilit radish]

https://docs.unrealengine.com/4.26/en-US/BlueprintAPI/Networking_1/ForceNetUpdate/

[real ridge]

calling this from my widget to destroy me and propably not working heh

[quasi tide]

You've been in this channel for a little over 2 years. At some point, you're just going to have to practice my guy. There isn't a secret trick. What helped me starting out was doing things in BP, just to see the flow of things and getting in the mindset of, "Okay - now I'm on this machine. I need to send information to that machine, so I need X"

For the deep topics, GDC vault is probably one of the better resources. Because it is done by people who have actually released games.

[vagrant grail]

I already practiced so it's not like I'm at level 0 I just need to push the concepts a bit more to learn more and to practice those concepts

[quasi tide]

Then you need to make a game that would utilize those concepts.

Make a simple racing game to learn how to deal with networked vehicles.
Make a simple UT clone to learn how to deal with competitive FPS networking.

Key thing being simple

[vagrant grail]

UT ?

[real ridge]

I dont want shit your deep convo but I have serious question why destroyed player can still use mouse input ? something weird

[twilit radish]

Unreal Tournament I guess.

[kindred widget]

It can't.

[real ridge]

calling this from widget and anyways can shoot and hear shooting in menu

weird

I made mistake ?

"called" is executed

[prisma snow]

something has to set the curves in motion

[kindred widget]

You're assuming something isn't spawning a new one. Or that the code running on mouse click is running through the thing you're destroying. You need to debug and find out if this is even being called, if the actor is even being destroyed, and if both are true, why input manages to make it to the left mouse click.

Also regardless of all of those. You should disable gameplay input when dead.

[twilit radish]

Test projects/games are my absolute favorite way to learn things like this btw. You'll just never truly get the same understanding from something unless you need to actually make it work. Reading up on something is good to see what you can do with something initially, although YouTube tutorials in specific end quite quickly with multiplayer in my experience. There are not a whole lot of people covering multiplayer topics tbh so let alone a whole lot more in the advanced sections, that's mostly Epic them self doing an occasional livestream once per year or indeed a random GDC talk 😅

[real ridge]

its called bcs string is printing but its like actor is not being destroyed

which is weird

really weird

it should be

[kindred widget]

What calls your left click code?

[prisma snow]

totally agreed. I had lots of fun doing a stupid simulation to try and learn Mass

[stoic lake]

That's what the tick is for, it gradually moves everything up the curve. If you have an idea how to set the curve in motion please let me know. Been trying to think of a way

I don't see any other way than using a tick or a timeline, but a timeline can't be played for multiple objects at once

[prisma snow]

but please stop talking about the curve and let's focus on the essential 😄 - WHAT or WHEN do the keys go down?

it is random? player input?

[stoic lake]

simple linetrace from the player calls the playnote event on the piano blueprint

[prisma snow]

that is the event that you need to multicast

that somebody pressed a key or linetraced or whatever

and the rest is client-side

[stoic lake]

It can't be since the piano is an actor which always runs on the server

[prisma snow]

ofc it can be, isn't the Piano replicated?

[stoic lake]

It is

[prisma snow]

then

you can xD

[stoic lake]

Somehow it's not updating for the clients even when replication is set to true

[prisma snow]

it won't update automatically lol

you need to do the RPCs

no offense but this could be faster and easier for you if you learned the basics first

use the compendiums pinned

[stoic lake]

none taken, I think I finally understand what you mean

haha damn, finally got it working the way you said

Thanks for the help mate

[prisma snow]

nice

np

but please check the compendiums pinned, those are really goo resources and will help you a lot

[twilit radish]

Compendium is awesome 😄

[stoic lake]

Yeah will definitely do, cheers

[prisma snow]

Both are

[twilit radish]

Never heard of this 'Wizard' person 😛

Although I do feel like his compendium is a bit more for when you're further into things already. Would definitely not call everything beginner friendly xD

[rose pollen]

keep waiting for the database section of that compendium

feel like i am guessing a good bit on what's best

[twilit radish]

Would not be surprised if he doesn't want to dig into the entirety of a database along with his job tbh.

[rose pollen]

haha yeah it may be listed as "coming soon" forever lol

[twilit radish]

But then again, I'm not him. So not going to put words into his mouth xD

[rocky stag]

Hello , my game server restarts a couple of time and then crashes with this error .

[2023.02.14-19.15.15:264][723]LogWorld: Error: Unable to travel to '/Game/FFA/Maps/Test5' - package is not a level
[2023.02.14-19.15.15:264][723]LogWorld: ----SeamlessTravel is cancelled!------
[2023.02.14-19.15.15:264][723]LogNet: Error: TravelFailure: NoLevel, Reason for Failure: 'Unable to travel to '/Game/FFA/Maps/Test5' - package is not a level' with a NULL UWorld

This happened after moved my project from 5.0 to 5.1

Used this method for restarting the game server

[woven bramble]

Hello, I'm stuck somewhere for Multiplayer FPS game. When they look at the character, they will see a TPS (FullBody) character, but we will see FPS while playing the game. Does it make more sense to do this by adding a Fullbody mesh and FPS mesh into one Character BP and changing the "owner see", or is it TPS BP + FPS BP?

[eternal lake]

There are a multitude of approaches. Do you see any problem with doing it with two separate BPs?

[woven bramble]

Obviously I have to do it as 2 separate BPs because I need to make AimOffset for TPS and for this "Use Controller Desired Rotation" has to be false. But for FPS character this has to be true. So I have to use 2 separate BPs.
But I don't know how to do it as 2 separate BPs. Will I spawn 2 separate characters at the same spot exactly?

[eternal lake]

I asked if you saw any problems with that approach

[woven bramble]

When I put Fullbody Mesh + Fps Mesh in a Blueprint, there is no problem. (except aimoffset)
I haven't tried it for 2 Blueprints separately. So I don't know if I will have problems or not. If there is only one thing I know, it is that I have to install this system in the form of 2 separate Blueprints. Any advice on how to do this? I don't know how can I do it.

"except aimoffset"

[eternal lake]

In multiplayer games, replicating things between the server and the clients is by far the most expensive and difficult thing

Why would you intentionally double your workload?

[woven bramble]

That's true, but I have to. So I want to get a TPS look for a Multiplayer FPS game. I could also have something simple just add TPS and put it on a camera head, but I don't want that. FPS Mesh should be of high quality and realistic.
Is there a method you would recommend for 2 separate Blueprint characters?

[rose pollen]

you can just calculate the aimoffset for the TP, use 2 meshes, 2 animation blueprints, 1 character, something like this

P1 is look down and left at his foot, P0 sees P1 head position accurately from aimoffset from the difference in the BP above, arm positions don't match exaclty in my case as the FPS arms are different than the TPS arms (with animations i am using, the TPS arms obscure your vision too much when fighting, so FPS arms follow same animations but are positioned lower and further back than the characters actual shoulders)

[young spoke]

whats a good way of destroying or omitting a bunch of static mesh components on your server that are just visuals

currently in BeginPlay()i check if (GetNetMode() < NM_Client) //skip;

[twilit radish]

Assuming you mean dedicated servers? Those don't load assets like that as they don't have an interface to view it, would just be a bunch of wasted memory. Also GetNetMode() < NM_Client returns for listen servers and standalone too FYI.

[woven bramble]

So I need to make AimOffset for TPS and for this "Use Controller Desired Rotation" has to be false (disable). But the "Use Controller Desired Rotation" option must be enabled for the FPS to work properly. Could you watch the video please?

[young spoke]

yep dedicated server. so for example, is a static mesh component with no collision enabled automatically ignored?

[rose pollen]

it looks like your heirarchy of components is backwards, make FP arms a child of the camera (I'd use a camera boom, but you don't have to)

[twilit radish]

I would assume the mesh it self not for the reason that visibility tracing and all that kind of stuff exists. Perhaps that there's a setting for it in specific as there's something similar for animations but not entirely sure.

But things like textures it could perhaps use are for sure not loaded.

[young spoke]

ok cool

[woven bramble]

I made FP arms a child of the camera, didn't work.
I don't think it has anything to do with it. The game is a completely FPS game and the Client will only see us as TPS. I don't need CameraBoom either.
If I put the camera on the head of the TPS and choose the easy way, like removing the FPS mesh, the problem is solved, but I don't want that.
There is 1 FPS Mesh, 1 TPS Mesh, and the game is an FPS game, my goal is to apply AimOffset for TPS Mesh. And I can't figure out such a simple thing.

[rose pollen]

my setup is a bit different but I think you are fairly close

not exactly clear to me from video what is wrong, i would try to disable "Use Controller Desired Rotation" completely, make your FP mesh a child of the camera, have your "look" input add relative rotation to the camera

but there are lots of ways to do it I think and you are on the right track

[woven bramble]

Thank you so much, I'll try to find true way.

[twilit radish]

https://www.unrealengine.com/en-US/events/gdc2023

Battle-testing UE5 Next-Gen Systems with Fortnite
Please Epic give us actual performance overviews / insights into Iris 😂

[quasi tide]

https://tenor.com/bka0W.gif

Most likely - it's just going to be what their blog post covered. The one talkin' about using 5.1 features in Fortnite

[twilit radish]

🥲

[gloomy tiger]

Is there any way for me to set listen on a map after opening it?

[ocean dust]

Hello, all. Is there a reason AGameMode::PreLogin is not exposed as a BP-overrideable function? I can't assign a player ID before ChoosePlayerStart is called because PostLogin and HandleStartingNewPlayer are both called AFTER ChoosePlayerStart...

Also, when should I set up my UI on my PlayerController clients? If I try to do it in BeginPlay, my listen server fails because OnPossess has not been called yet, but if I do it in OnPossess, that is never called on the remote clients...

[latent heart]

Your UI shouldn't really care if you have a character or not.

Of course, it can change depending on what you have, but it shouldn't just fail.

[ocean dust]

I have Shields, Health, Power, and Heat components on my Pawn that deal with those resources and are replicated. But if the Pawn has not been possessed by the PC, how is the UI supposed to know what values to put there?

[latent heart]

If the pawn isn't there, just hide the ui elements? Or set them to 0/0?

[ocean dust]

I don't understand. I have UI elements that depend on the Pawn's state. Where are these variables supposed to be?

[latent heart]

Have a fallback.

[ocean dust]

That isn't answering the question

What is the appropriate event to set up my UI? Even if I hide it before the pawn is available, I need to set it up at some point. Do I have to busy-wait with a Tick (common in Unreal, unfortunately) or is there a network event that I don't know about?

[latent heart]

There are definitely possession events, but I don't know if they are exposed to BP.

[ocean dust]

Well, I can confirm that at least in PiE testing OnPossess in BP is never called on remote clients

[latent heart]

It would need to be a specific RPC tied to possession. Or an OnRep.

[ocean dust]

Well, my hack was going to be creating a new variable for my Pawn that is RepNotify, setting that in OnPossess, and then handling that on the client once the replication occurs

Does that seem reasonable/necessary? Working around the fact that clients have no event called after possessing a replicated pawn?

[latent heart]

So yeah the onposses isn't a networked event, it seems.

Fun stuff.

So the pawn itself is an onrep'd variable.

So just use that.

    UPROPERTY(BlueprintAssignable, Category=Pawn)
    FOnPossessedPawnChanged OnPossessedPawnChanged;``` or this

[ocean dust]

Is this a custom delegate or a built-in one?

[latent heart]

Copied directly from AController.

[ocean dust]

https://docs.unrealengine.com/5.1/en-US/API/Runtime/Engine/GameFramework/AController/OnPossessedPawnChanged/

Yeah found it. Will investigate, good find!

So far, it looks like that delegate is never called for first-time possession. I don't see that being called for my listen-server, nor my remote client, but the server-side PC for my client gets the notif, but not the client itself

How are other people doing this? I've taught myself everything about Unreal, and I'm realizing that I have a wildly different approach to things than most people and even the folks at Epic. I fight Unreal ALL THE TIME because I just have a very different archtecture approach

I should really hire someone to teach me at some point

[prisma snow]

ye fighting the engine is generally a bad idea

for multiplayer I recommend the compendiums pinned

probs starting with Cedric Neukirchen's one

[ocean dust]

I have read it, I understand the architecture, I don't recall if it goes into detail on exactly how to implement many of these things (because they are often game-specific)

[ocean dust]

Yes, of course. I find myself expecting certain things (like events on remote clients when Pawn replication/possession has occurred) and I keep thinking that maybe I'm doing something wrong

[pale obsidian]

What about ReceiveRestartedDelegate In the Pawn class? I use this for one of my components, and it's BlueprintAssignable. There's also ReceiveRestarted, which is a BlueprintImplementableEvent.

The comment above it: Event called after a pawn has been restarted, usually by a possession change. This is called on the server for all pawns and the owning client for player pawns

[ocean dust]

Investigating, good find

I would prefer it on my PlayerController (that's where I am building and presenting the UI), but I can work with it

[ocean dust]

Well, that is SUPER messy right now, but it's the only event that seems to be called when I need it to be called: after the pawn is spawned, replicated, possessed, and ready on both client and server

Good catch, thanks all!

Funny enough, the first event I see is the custom variable OnRep notify, before anything else is called on the remote PC

So might have to use both approaches: use the OnRep to Bind Event to ReceiveRestarted, then use the bound event to update the UI and carry on as "ready"

Have guests coming over, have to put a pause on this for now, thanks for your help, all!

[tame quarry]

Before I design my whole game in the wrong way. I'm pre-thinking the future multiplayer part of my game. I'm doing a squad based rts. So its small groups of units fighting other groups of units.
When 2 groups clash, I select random units and send them to the enemy group of units. At random.
Is this randomization good for multiplayer because it means each machine will have its own randomization. So each machine will select different units and different targets to go to.
This means that ech time there is this type of combat, i cant use randomization, i must use a predictable formula that will be used in both machines. Or if i cannot do that, i must send a packet for all the units, right? Which is not very efficient.

Should i rethink this through? It may need a deterministic formula instead of so much randomization.

[robust oriole]

Uuuugh... i have a pawn, on which i overrode the "on unpossess" function to spawn the default AI controller. At certain points in my game, i want to unpossess the players pawn and let the AI take care of the pawns movement. This is done in blueprint, i call "unpossess" on the pawns controller (Server side), and then issue the command to the pawn that starts the movement (also server side).

Now what confuses me is that this works in PIE when i play as a client with 2 players, but DOESNT work, when i play with only one. When i play with two, both the ensures for GetAuthority and the AI Controller return true, when i play with one, the Getauthority returns false, and the AI controller is null (because the pawns controller itself is null)....

can anyone tell me what i did wrong here?

[kindred gazelle]

Is there a reason why server events take a long time to trigger when called from the client?

To me it obviously makes sense since it takes time to go from client -> server -> client, however it would only be noticeable for complicated logic. I'd assume that on average network emulation profile in editor it wouldn't take too long, but I'm noticing that it takes long enough for errors to occur sometimes (for example, a simple item pick up can take a quarter of a second which is long enough for the client to try picking it up multiple times before the server tells the client it has been destroyed, which causes an error "pending kill"). But I notice it for simpler things too, like the most basic server event will take a quarter of a second to trigger on the client which does get annoying. Tbh, it could be an issue just with our project so if that's not normal let me know

I notice that this is happening even on average network profile, and it gets exponentially worse on "bad". The way I've been getting around it is by having things occur on both client and server (such as inventory changes on server, but the UI updates independently on the client so that the client doesn't need to wait for the server). Is this a standard approach to ensure network delay isn't noticeable? Or is there another better method

[robust oriole]

are you running your game in PIE with play as client?

[kindred gazelle]

I'm doing listen server with 2 players

It does the same things though when playing multiplayer in the shipped version

[robust oriole]

did you try overriding the network emulation settings? afaik default network emulation has a latency of like 0.1s, though im not 100% certain about this

[real ridge]

where is better to handle widgets which should be multicasted to everyone in player controller or his pawn?

for example count down

timer

or game over?

[kindred gazelle]

yeah I wouldn't think any of the settings would be a problem

[prisma snow]

I'm going to go the "server decides target" route and send it to clients. It is very difficult to find a deterministic way to assign enemy soldiers from battalion to battalion. Something that might work is, if indexes are deterministic (soldier 1 on battalion 1 is also always soldier 1 on battalion 1 for other clients) is to do some simple assignment based on division/modulo

I'm personally going to try a server approach because there might be corner case scenarios where you want units to fight in a less strict way

For example if the enemy battalion is already engaging and there is no room to fight properly, units might fight closest enemy from other battalions or buildings

[robust oriole]

turns out this doesnt work because spawning the default controller doesnt work when the actors net mode is Client. Now to find a way for my server to unpossess a pawn from a connected client, instantly assign an AI controller and then call for the movement to be executed

[twilit radish]

AI stuff should (and is in general enforced) to be on the server side for good reasons though 😄

[short arrow]

Anything significant imo anyway

[twilit radish]

Also @kindred gazelle what you described is just latency. I would recommend fixing those errors as your players are going to ruin into them regardless of you turning off the emulation or not. In your case the emulation profile is for everything which means that it's for both incoming and outgoing packets on both client / server.

So Client 1 sends a packet -> 30/60ms delay -> server receives -> 30/60ms delay -> processes on the server and sends a responses to Client 1 -> 30/60ms delay -> Client 1 receives -> 30/60ms delay and only then they actually get it. On top of the packet loss.

So sounds like normal behaviour to me what you've going on there. And if it's hindering gameplay then you should take that as a sign that someone who is actually playing your game with a slightly bad connection will have issues with it 😉

[short arrow]

I would probably make something like a bunch of rabbits running around client sided

[twilit radish]

Depends on whether or not it needs to be synced. If it needs to be synced it's not a client's job to do it.

Also Unreal shields off decent parts of AI stuff on client net modes, as Fennel found out 🙂

[short arrow]

Yeah that's why I said anything significant, in the example I gave with a bunch of rabbits running around. Probably doesn't need to be replicated in most cases, because it'd probably nuke your servers performance

[twilit radish]

I mean to be fair, games that do this do not just load in a million rabbits all at once. The Forest has creatures for example and has at best 30-50 of them inside your distance. (Birds, rabbits, deer etc.) Which I think is still a bit of a high number.

[short arrow]

case by case thing I guess, depends on what kind of game you're making. IIRC the forest doesn't allow many players in their multiplayer lobbies. So there's a lot more to work with

but something like rust or ARK would be detrimental for sure

[robust oriole]

Can i, on server side, unpossess a pc's pawn and instantly possess that pawn with its default controller?

[twilit radish]

Should be just fine, does something not work about it or?

If anything, the possess function ultimately unpossess if there's still a previous owner 🙂

[robust oriole]

Well, in my case if i call SpawnDefaultController in the OnUnPossess function of the pawn, it fails to do so because net mode is client :/

[twilit radish]

That does not sound like you're on the server to me then.

[robust oriole]

If i unpossess in the server does it call OnUnPossess on the client then?

[twilit radish]

To my knowledge it should be a server side event only, are you sure you're actually calling the unpossess from the server though?

It does not seem like Unreal does much to protect from that (because why should it anyway I guess). So that might mess up some things too if accidentally happening.

[stoic lake]

Hi there, how exactly does replicated actor input work? I haven't been able to find any solid articles or documentation on this

For example: having a keyboard event on an actor and wanting to multicast that event

[twilit radish]

That's because they don't replicate by default whatsoever. If you need to send up something to the server you just do it your self. If a client as an example presses the interact button the client sends a message/RPC to the server "Hey I pressed my interact key" and then the server can do whatever it wants 🙂

[stoic lake]

I tried that, but the server ignores the event.
Play note is multicast somewhere down the line

The actor has been set to replicate

[twilit radish]

Is the actor owned by the client trying to press the key?

[stoic lake]

Ah right, would that mean I have to set the interaction up in the playercontroller and send that message up to the server there first?

[prisma snow]

yeah

[twilit radish]

If you don't want to or it makes no sense to set the player as the owner of that actor then yes.

[stoic lake]

Okay, thanks :)

[robust oriole]

i mean im calling it the unpossess from a server reliable RCP in blueprint

[twilit radish]

Can you show your setup?

[robust oriole]

1sec

@twilit radish This is the RCP that i call on an actor

this is the function within there, where i call "unpossess"

and at "AttachToGrid" the pawn needs to have an AI controller, because that uses AI movement

[twilit radish]

Can you show the relevant log part of what exactly Unreal is yelling at?

[robust oriole]

its not yelling in the logs, which makes it hard to debug... if the unit's owner isnt the listen server client, but any other client, it just doesnt spawn & assign a new controller in the overridden unPossessed

because this returns client

[twilit radish]

How did you check if that is the case though?

[robust oriole]

went through it with the visual studio debugger

the weirdest thing to me is that it used to work pretty much exactly like this...

wait let me rewind to an older version >_>

[twilit radish]

The actor from this screenshot is replicated right?

[robust oriole]

this version worked

[robust oriole]

yes, thats the player's character

in that moment i want to take away control from the player and let the ai move that character

[twilit radish]

Is this also in the character?

[robust oriole]

no, thats a separate actor called "Encounter manager". i spawn that at the start of an encounter

[twilit radish]

Is that one replicated?

[robust oriole]

yes it is

[twilit radish]

Is it actually spawned on the server?

[robust oriole]

let me check

its spawned like this inside the game mode, so id assume yes

[twilit radish]

The game mode is already on the server, not sure why you're calling a RPC there towards the server at the end.

Or well even better, game mode only exists on the server.

[robust oriole]

good point, that doesnt need to be server side RPC. but i doubt thats what is causing this issue

...

i turned it off and on again

i didnt change shit (except that RPC you mentioned)

[twilit radish]

Turn what off?

[robust oriole]

editor

and now it works

[twilit radish]

You aren't using hot reload right..?

[robust oriole]

i wasnt changing anything in C++ atm

but i do use hot reloads when i do, usually. unless i change u-things then i restart the editor

[twilit radish]

So… don't use Hot Reload in Unreal Engine 4 because:

Data corruption in Blueprints: it can reset and mangle any variable at whim. The only way to fix it is to roll back to a previous file version from a backup or from source control (perforce, git, svn, etc.)
It can't deal with header changes (.h files) or constructor changes
It's deprecated, not maintained by Epic anymore
Just don't use hot reload please. If you insist on using something similar use live coding instead but please ditch hot reload:
https://horugame.com/dont-use-hot-reload-in-ue4/

It's very likely that it just messed up something somewhere tbh if all you had to do was restart the editor.

[robust oriole]

hot reloads = live coding, right? and the issue persists in ue5?

[twilit radish]

No. Hot reload != Live coding.

[robust oriole]

oh 😮 let me read up on the diff

[twilit radish]

And yes UE5 still has the exact same issues. Hot reload is garbage and should get removed from the engine.

[clear island]

hot reload was the previous solution

live coding is the new recomended one

although some bugs still have transferred over

[robust oriole]

oh in that case no, not using hot reloads, only live coding

[twilit radish]

It's at least better than hot reload, but indeed still far from perfect.

[clear island]

yes and even when using live coding, only use it when you change function bodies is what I'd recommend

[twilit radish]

Either way.. Hot reload strikes again 🤣

[robust oriole]

id say "alls well that ends well" but im kinda scared this might happen again

[clear island]

keep some backups, I've had cases where maps got corrupted and I wasn't even using live coding or hot reload

the joys of UE 🙃

[robust oriole]

das why im using version control^^

[clear island]

yea you should

[twilit radish]

IMO just don't use both. Not having to deal with the corruption / weird issues that come from it is so much more worth your time besides that it does not save an extreme amount of time anyway as Visual Studio can already do incremental builds where it only changes the stuff that was actually changed.

Also +1 for version control yeah.

[robust oriole]

1 points for git-ryffindor

[cold moat]

confusing question:

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

    DOREPLIFETIME(UArcItemFragment_SkeletalMesh, Mesh);
}

If i stick one of those into non-replicated TArray<UArcItemFragment> Stuff, will it still replicate anyway?

i DON'T want it to replicate

Its on an Actor that replicates it's movement, but the data is only needed on the server

[twilit radish]

Not sure I understand you. You don't want to replicate the item because you only need it on the server, then why are you replicating it?

[upbeat basin]

Confusing question indeed

[cold moat]

its a story and a half lol

well, im working on grenades

those fragments hold data for the weapon, but the item can be put away right after throwing

so i need to take a snapshot of relevant part and copy it onto the actual grenade actor

so that each grenade(or mine or whatever) has its own instance of the data (so you cant retroactively get a damage upgrade or something after throwing 10 mines)

but, will the fragments even replicate, when the array holding them isnt replicated?

[twilit radish]

This does still not make it much clearer if I'm honest. I really don't see why you just don't replicate the data.

If an array isn't marked as replicated then no the array is not going to replicate.

If a specific item within is replicated it self then that's a different story 🤷‍♀️

An exception were something implicitly replicates is if you throw it in a struct as a UPROPERTY and then replicate that struct for example, but then again you're explicitly replicating that struct. Although in that case the NotReplicated specifier exists.

[cold moat]

would

UPROPERTY(NotReplicated)
TArray<ReplicatingFragments> Stuff;

work? doesn't seem so

😦

[cold moat]

but does it even has anywhere to "replicate to" ?

the object only exists on the server

will it create a free-floating object on the client?

[twilit radish]

If you have a a TArray of actors for example:
TArray<AActor*> MyActors;
And that MyActors array is not replicated doesn't mean that the actors them self can't be replicated is what I was trying to say.

However if you do the exact same thing with actors that are not replicated but the array is now replicated they will just be nullptrs on the client because they don't exist from the client's point because they aren't replicated.

But again, still no idea what you're trying to do 🤷‍♀️

[cold moat]

if we dont know what we are doing, then the enemy cant know what we are doing taps head

[cold moat]

here it is exactly the opposite lol, its a non replicating array of UObjects (the UObjects themselves shouldn't (?) be replicating either, but they have some UPROPERTIES() that are set to replicated), created only on the server

does the replication system do anything at all in this case?

[twilit radish]

UObjects don't replicate. Since 5.1 you can specifically do this if you want to though. But if you have a TArray that is not replicated then you aren't replicating them unless something else is replicating them. Doesn't matter if you put Replicated above some random variable in there. If you're not explicitly replicating that object "somewhere" in your project then no it's not going to magically replicate as you're not telling it to replicate.

It's the exact same thing with actors and anything Unreal related, if an Actor is not set to replicate it's not magically going to replicate.

You explicitly mark what you replicate and what not. Whether that's a variable, an actor or whatever.

[cold moat]

So, you basically need the object instance on both the server and the client for its properties to try replicating?

does the non-functional part of replication have any cost?

[latent heart]

Where would they be replicated to if the object didn't exist?

[cold moat]

https://tenor.com/view/shrug-shrugs-shrug-gif-shrug-emoji-emoji-gif-26271492

hey, if i knew, i wouldn't be asking 😛

[twilit radish]

An uobject it self can't replicate it self. The only thing in Unreal that can do this are actors. An uobject can be since 5.1 be a replicated variable inside an actor but that's it.

Well it could also before 5.1 if you made some changes, but again it can only be a variable inside an actor if you want it to replicate as uobjects them self have no power to replicate on their own without an actor.

[high ibex]

hello all, in a basic car template in UE5 , off road car is going 130 + in certain time in server but in client, it is stucking at 102 or maybe 104 speed .. i thought this as the issue of replication and tried run on server, mc events but still no effective result. Replicate movement is set to true. In standalone, car hits 130+ as normal as in server. i'm unable to figure what 's the issue ? thanks for answers

[cold moat]

its really hard to understand what you mean

[high ibex]

oh sorry, i have put no. of players to 2 players and net mode as play as listen server and clicked on play thus getting two windows - one as server and other as client. For the same distance, where the car in server goes till 130 km , the car in client is not going beyond 102 km/h mark.

[cold moat]

Sometimes listen servers can execute code twice, because they have both roles

That would be my first guess

Outside of that it is kinda hard to say, we have no idea how your code works

[high ibex]

oh .. for the movement, i have not added anything extra though .. the same bp code for move forward and move right which comes after creating project with template, is i am using

[stray reef]

men, can someone explain me why deltatime is different between client and listen server in PhysCustom of the character movement component?

[cold moat]

DeltaTime is not constant

[chrome quest]

Uhh because they probably run on different PCs

[cold moat]

It's basically semi random "how long did the last update take"

[chrome quest]

Deltatime depends on hardware. And is not even consistent on the same hardware. Also depends on the code running on the said hardware.

[stray reef]

how can I synchronize a value of a resource that is consumed during a certain type of movement?

i have a jetpack that use fuel during the time that is active

i was thinking to consume it with delta time in physcustom but i guess is a totally wrong thing to do

[cold moat]

Well, I dunno how you feel about Gameplay Ability System xd

[stray reef]

no pls hahaha

[twilit radish]

You may want to see it as "stamina" which in that case there's an implementation of in the last pinned message in this channel.

[stray reef]

i just need to make the amount of fuel consistent between all client

[stray reef]

oh yeah

thank you i will study that implementation

[lapis zinc]

Hi I cant find any answers online, is it possible to have a multiplayer game that doesnt have steam subsystem or epic online service? I want to connect two people internationally, but every tutorial I find is just connecting people on the same wifi network or using some sort of third party system like steam sessions. Ive look into port forwarding but seems like its to complicated for everyone to just switch to port forwarding all the time. Any help would be much appreciated!

[twilit radish]

The reason why everyone uses third party systems is because two (or more) computers can not directly play with each other. So you either indeed need to port forward and specify the IPs or you need to use something that can do this for you. This is where systems like Steam, EOS etc. come into play because it's costly and difficult to setup your self. You can in theory do it your self if you want but I would just not recommend it tbh.

[fleet viper]

Hey there, im trying to replicate my mission system. My OnMissionStarted event is fired on the server (since ending and starting is handled by the server) and now i want to create a callback for my clients ui. Im trying to replicate the information back to my client via a client rpc but that rpc is never called..why tho? Shouldnt the server be able to call the client side at all times? (especially since this is in a player controller)

[lapis zinc]

is there an alternative to Steam an Epic? Ive published multiplayer games before using steam, but its a $100 hit everytime. And epic has to verify that the game is legit before allowing users to connect. I create alot of "shit post" games that can get fairly popular and cant imagine epic would allow them into their store.

[twilit radish]

There's Photon which is free to test things out with but requires you to start paying when you hit like 20 players or something. It "supposedly" should work with Unreal but I've barely ever seen anyone here talk about it nor used it my self for Unreal.

Beyond that I have no clue.

[twilit radish]

When are you calling the RPC? Just random throughout the game?

[fleet viper]

@lapis zinctheres also reverse winter studios who just launched their own launcher, they also have a website called like that

[fleet viper]

its just that blueprint code ive shown you

[lapis zinc]

I mean thats a pretty good start, I appreciate it! Thank you!

[twilit radish]

As in triggering / firing the RPC. When does the "On mission started" even get called?

[fleet viper]

roughly 0,2secs after begin play

[twilit radish]

Because it should indeed just work. Player controllers always have an owner and are always replicated, the only case where they can drop is if you're calling this before the actor is properly replicated.

[fleet viper]

this is really weird huh

[twilit radish]

That "Debug Start mission" thing is not attached to beginplay right?

Or something similar?

[fleet viper]

its a custom object that holds the flow of the mission

so i dont think it should

[twilit radish]

I think I see the problem. You're starting call Start Session Mission on the server with a multicast. Then that starts the mission. That runs on both the client and server.

Which in return probably also just calls that RPC on the client.

[fleet viper]

that could be a reason

nope

just for ref i am simulating in client mode

[twilit radish]

I mean I guess it should still work either way, it's not entirely how you should be doing that but oh well. What I would try to make sure of is that the initial call actually happens on the server and not the client.

[fleet viper]

output log says that the initial call only happens on the server

[twilit radish]

And you're sure your start mission node isn't returning early for a client/server or something similar and then not calling your event?

[fleet viper]

ill try another delay

[quasi tide]

Sounds problematic

[fleet viper]

but i dont think that its a time issue

[twilit radish]

I also don't see what a delay would do anyway. But in general it's a bit confusing code.

[fleet viper]

you were actually right

[twilit radish]

You're trying to call the start mission event for everything, that's fine. But then the start mission event calls a client RPC with that the mission actually started while the client already does the same thing and that's where I get lost a bit.

[fleet viper]

the delay helped

lol

[twilit radish]

Where did you put the delay?

[fleet viper]

I broke the code down too

just right before the rpc call

wait wtf

idk how but the default on mission started call function is suddenly on client too

[twilit radish]

That's what I just told you. A multicast runs everywhere.

[twilit radish]

😉

But I think at this point you're calling this from somewhere where the controller is not properly replicated to the client yet tbh.

[quasi tide]

Mission doesn't even need to "start" on clients to be honest. Server just updates things that needs to be sent.

Sends messages, etc..

[fleet viper]

thats what im trying to do

[quasi tide]

Just use Flowgraph honestly.

[twilit radish]

What is flowgraph?

[quasi tide]

The bees knees

[twilit radish]

The what now

🤣

[fleet viper]

well, its actually not because of the delay, but because of the packet lag i added huh

[quasi tide]

https://github.com/MothCocoon/FlowGraph

[twilit radish]

That's what I'm saying. You're not giving the controller the time to replicate to the client and then it drops it on the server mean while when you call that RPC because it's not ready yet. Although Iris will start deferring that, but soon™️ I guess.

[quasi tide]

I don't know if I'd even mention Iris honestly 😅

Heaven only knows when it'll stably release as well as actually be usable.

[twilit radish]

They already enabled it in UE5-main.

And in 5.2 Lyra will have it enabled too.

[quasi tide]

So 5.3?

[twilit radish]

Idk 🤷‍♀️

Whenever they feel like it 😂

[quasi tide]

Still waiting on the stats though 😅

[twilit radish]

Yes 🥲

[quasi tide]

"Trust me bro" - hardly a source

[twilit radish]

Do any Epic staff look on the multiplayer forums, would it be worth asking about it there?

[quasi tide]

¯_(ツ)_/¯

I can see that this question was not answered 😅 : https://forums.unrealengine.com/t/tutorial-experimental-getting-started-with-iris/758181/2

[twilit radish]

Oh there is a discussion thread :0

[quasi tide]

Thread, sure - discussion implies a back n' forth though.

[twilit radish]

😅

[solar stirrup]

I kinda wish the new subobject replication made it simpler to replicate X subobject to a list of specific players

Since the subobject can only have one net group, kinda makes it a little dirty

[twilit radish]

You could still use the old way though which I believe gives you control with COND_SkipOwner etc. https://jambax.co.uk/replicating-uobjects/

Bit more work though.

[chrome bay]

Even I've moved to the new system 😄

You had no control what connections the objects replicated too in the old version IIRC

[twilit radish]

Ah nevermind then.

[kindred widget]

New system?

[quasi tide]

https://docs.unrealengine.com/5.1/en-US/replicated-subobjects-in-unreal-engine/

[twilit radish]

I finally got Iris working I think! Although it's a bit whack. CPU performance seems quite a bit worse with a lot of actors. However it seems like they are more efficiently being able to pack together replicated properties in the end(?).

The test was basically 1 listen server and 1 client. Both using -nullrhi (so no graphics) and both the same profile arguments. The server would spawn 2000 actors that constantly in tick increment a float and an uint64 that both are replicated. They were all standalone builds without running the editor and as minimal stuff going on for the PC. The only difference was toggling iris through a launch argument.

Can I just safely zip up profiling things? Then I can share them here I suppose.

It does get a bit more stable, perhaps when all actors were finally replicated(?). But yeah. Not so sure I like what I see 😅

[quasi tide]

Experimental

I'll probably end up shipping like 2 games before Iris is usable 😅

[twilit radish]

This is what I was talking about, there's like a sudden "wow, let me actually be more performant now"..

[winged badger]

Takes a while to replicate 2k actors

[twilit radish]

Well yes. But it goes up to 5-7ms during that period while with disabling Iris it does not spike up so bad as Iris does whatsoever.

After that point it does become pretty even with the normal system, it's not better or worse at that point though.

[kindred widget]

What about constantly changing stuff though? Like 2k actors coming into and going out of relevance? Cause isn't that what Iris is supposed to affect by replacing the replication graphs?

[winged badger]

Dev editor?

And iris optimizations come into play with handling relevancy and also having genericout of the box struct delta serialization with compression

None of which applies to your experiment here

[twilit radish]

If you're asking if I did this in the editor. No this was packaged with the editor closed.

[prisma snow]

Is it fair to compare Iris to the existing solution which obviously cannot handle 2k actors? 😄

[twilit radish]

I mean it handled it better than Iris did lol.

[prisma snow]

Idk Iris' purpose but I guess is to do the same thing more efficiently rather than doing different things

[gloomy tiger]

Greetings!

Not sure if but - is it possible to listen=true a map without re-opening it?

[winged badger]

Did it? Or is iris time slice interval different?

[prisma snow]

yeye but it's still crazy numbers for performance

it would be an interesting experiment if any of the two systems claimed or pretended to be able to do that

[winged badger]

No, cant do it eith seamless travel either

[twilit radish]

See the first two screenshots I posted. Iris ran between 5-7ms for a solid 20 seconds when I assume replicating the actors while the normal replication system did not go that high whatsoever.

[rocky kestrel]

How to set dynamic parameter value only locally in player beginplay?

This how I do it now and it doesnt work

[winged badger]

To play the devils advocate here, iris might had been replicating more actors per frame

[rocky kestrel]

it basicly changes world position offset in material

[winged badger]

IsLocallyControlled

[twilit radish]

Hmm..

[rocky kestrel]

Thanks!

[twilit radish]

If only Epic would just give us a performance overview and how they actually test it. Because 'something' has to be tested as otherwise you can't see if what you're creating is better or worse lol.

But I don't feel like it's a completely unfair comparison though. Even if we for example assume that the regular system may better slice it than that still shows that Iris can be improved there as you really don't want a bunch of spikes.

[prisma snow]

Well I wouldn't expect that to happen until Iris is actually close to a ready form, idk the current status but might be too soon

[twilit radish]

Okay wait I'm stupid that's not true lol.

Finally, it’s worth noting that as of CL 22864286 in UE5/Main, Iris compilation is now enabled by default (i.e. bUseIris=true), with Iris being disabled at runtime by default. The rest of the steps here should still be taken in order to enable Iris in a project. Additionally, the experimental Iris plugin will need to be enabled for the project, and the “net.Iris.UseIrisReplication” CVar set to 1.

But still something I guess 😄

[honest rain]

Hey guys ! 😄
So I am trying to get a NetMulticast function working, but I must be missing something somewhere.
My actor 'World' is in the scene when the game starts for both server and client.
In this world I have a function

        void testServerSpawnToClients();```
 and in cpp 
```void AChunkWorld::testServerSpawnToClients_Implementation()
{
    UE_LOG(LogTemp, Log, TEXT("This SEEMS TO BE WORKING"));

}

but it only fires on the server. Now the reason it only fires on the server, is because no clients are calling it ?

I mean no owning clients

[opal fox]

@honest rain from where are u executing that multicast

[honest rain]

From the World actor, begin play function

[opal fox]

and are u playing as a listenserver or a client on a dedicated server?

[honest rain]

I am playing as a client on dedicated server

now the function seems to be only firing on the server, not the client

[opal fox]

I dont see anything wrong with the code u provided, and if ur calling that in begin play from an actor that uve instantiated in ur level then something else must be wrong

I just did that exact thing u did now and it works for me

canu maybe paste the begin play function

[honest rain]

sure !

{
    Super::BeginPlay();

    testServerSpawnToClients();

}

here is the constructor :

{
     // Set this actor to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
    PrimaryActorTick.bCanEverTick = false;
    
    bReplicates = true;
    bAlwaysRelevant = true;

    USceneComponent* sceneCom = CreateDefaultSubobject<USceneComponent>(TEXT("RootSceneComponent"));
    SetRootComponent(sceneCom);


}

[opal fox]

have u removed net load on client on the actor or something ?

[honest rain]

I don't think so

no it is checked

[opal fox]

try running as 2 seperate clients

[honest rain]

ok

still only working on server

[opal fox]

i have ur exact same setup in my actor that I just created

and I get 2 logs from multicast

[honest rain]

is it possible that it is because the function is called when the actor is not fully replicated on the clients ?

I got this warning though :
LogNet: Warning: UNetDriver::ProcessRemoteFunction: No owning connection for actor ChunkWorld_UAID_244BFE55969AA26401_1423050272. Function Generate3DWorld will not be processed

Generate3DWorld is in the beginplay function as well

[opal fox]

yeah looks like u dont have a connection to the network on that actor, did u spawn it in the code somewhere, or have u created a blueprint actor and dragged it into the level ?

I assume its only spawned on the client

[honest rain]

Yeah I dragged it directly on the level

so when I start the game it is already there

[opal fox]

`` #pragma once
#include "CoreMinimal.h"
#include "Components/BoxComponent.h"
#include "GameFramework/Actor.h"
#include "Net/UnrealNetwork.h"
#include "LevelManager.generated.h"

class ADefaultCharacter;

UCLASS(Blueprintable)
class TERANT_API ALevelManager : public AActor
{
GENERATED_BODY()

public:

ALevelManager();



UFUNCTION(NetMulticast, Reliable)
    void PrintMessageToEveryone(const FString& Message);

protected:

virtual void BeginPlay() override;

};

CPP:

void ALevelManager::PrintMessageToEveryone_Implementation(const FString& Message)
{
GEngine->AddOnScreenDebugMessage(-1, 10.f, FColor::Magenta, Message);
}

void ALevelManager::OnOverlapBegin(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult)
{
if (OtherActor)
{

                    PrintMessageToEveryone("Hello");
             
    
 
}

}

``

[opal fox]

ive also made it into a blueprint and dragged it into the level like u did

[honest rain]

what if you call the function from begin play ?

[opal fox]

Let me try

Only got 1 log though

but the debugscreen message happene twice

try using debugscreen message

Not sure whats going on here actually, just trying to help out xD

[honest rain]

thanks for trying ! 😄

I am going to try with debugscreen

[opal fox]

No I did get the Ue log twice actually, it just happened alot higher up, I had to search for the log to get both

So I think ur code is probably fine

The server calls that log, then some initialize happens on ur actor and u get the log filled with lots of other stuff, then u only see that last message at the end.

I guess a good confirmation you could print is to see if u have authority inside the string message.

[honest rain]

oh I get 2 print screen messages

[opal fox]

@honest rain filter the entire log by only the string ur printing, then u will see both messages probably, they happen with like 1 second in between

ur multicast is fine

[hardy monolith]

Hello! I use the mouse position to rotate object. If mouse is close to the edge of the screen, I want pawn to be rotated.
The question is - since rotation needs to be done server-side, to do it I need to replicate mouse position from client to server every tick. This doesn't sound like good solution to me 🤔

This is BP code which controls movement

[opal fox]

I guess if thats good or not depends on many different things, but if u use standard replication and maybe go from tick to calling it every X seconds, and just linearly interpolate the rotation value, u probably will be better off in terms of performance, I assume.

[honest rain]

it seems fine indeed ! I guess UE Log doesnt get called depending on client /server

[opal fox]

@honest rain no the log is there u jnust need to filter the search

Then u will see that the log happens twice, its just happening with some delay after the first call from the server

[honest rain]

would you know then if that is possible to call that NetMulticast function from a SERVER function, and getting still the client to get notified ?

[honest rain]

ooooh I see !

[opal fox]

Yes you can do that, but I would suggest just using standard replication for that

u can just replicate a value and the clients will be notified if that value is updated

theres a function called OnRepNotify

[honest rain]

Yes but that's only for values right ? What if I want to call that UFUNCTION(NetMulticast, Reliable) void PrintMessageToEveryone(const FString& Message);
but from a Server function ?

[opal fox]

I guess u can just use a multicast , especially for those 1 shot events I dont see any problems, maybe someone else has other ideas, but im pretty sure thats what they are made for.

maybe tag it as unreliable if its not so important to get it out immediately

[honest rain]

true

thank you ! ^^

[hardy monolith]

Thanks

So, there is no way to get rid of mouse position replication, but I can do it not as often

Not sure if it's fine for input delay

[outer sphinx]

Hi guys, one question. Does anyone here use the "mysqlConnector" plugin?

[honest rain]

So I can't get my head around how that works, and it's driving me crazy 😆
here is the full setup :
World.cpp , Function Server being called spawning an actor actor.cpp :

World.h :

    void Generate3DWorld();

World.cpp:

{
    Super::BeginPlay();


    Generate3DWorld();

}

void AChunkWorld::Generate3DWorld_Implementation():
{
      AActor* NewActor = World->SpawnActor(ChunkType, &translateTest, &FRotator::ZeroRotator);
      NewActor->InitializeGeneration(Frequency);
}

Actor.h :
UFUNCTION(NetMulticast, Unreliable, BlueprintCallable) void InitializeGeneration(float FreqNoise);

Actor.cpp :

void AChunk::InitializeGeneration_Implementation(float FreqNoise)
{      if (HasAuthority())
    {
        // This code will only be executed on the server
        GEngine->AddOnScreenDebugMessage(-1, 10.f, FColor::Magenta, "bBool BEING REPLICATED");
    }
    else
    {
        // This code will be executed on the client
        GEngine->AddOnScreenDebugMessage(-1, 10.f, FColor::Yellow, "bBool BEING REPLICATED");
    }
}```

The 'InitializeGeneration' function will only be called on the server, which I guess is normal since the server is calling the function... but at the same time, the function is Multicast, so it would make sense that it will be replicated on clients as well, since the actor it is being called on is set to replicated ? What am I missing ? how could I get the function to get called as well on the client ? I tried using OnRepNotify but it seems still being called on server only

[honest rain]

No Sql for me sorry 😦