multiplayer

[pliant cypress]

is this correct?

if (SoldierCharacter->IsLocallyControlled())
{
    if (bWeaponEquipped && EquippedWeapon && EquippedWeapon->GetWeaponMesh() && SoldierCharacter->GetFPSMesh())
    {
        LeftHandTransform = EquippedWeapon->GetWeaponMesh()->GetSocketTransform(FName("LeftHandSocket"), ERelativeTransformSpace::RTS_World);
        FVector OutPosition;
        FRotator OutRotation;
        SoldierCharacter->GetFPSMesh()->TransformToBoneSpace(FName("hand_r"), LeftHandTransform.GetLocation(), FRotator::ZeroRotator, OutPosition, OutRotation);
        LeftHandTransform.SetLocation(OutPosition);
        LeftHandTransform.SetRotation(FQuat(OutRotation));
    }
}
else
{
    if (bWeaponEquipped && EquippedWeapon && EquippedWeapon->GetWeaponMesh() && SoldierCharacter->GetFPSMesh())
    {
        LeftHandTransform = EquippedWeapon->GetWeaponMesh()->GetSocketTransform(FName("LeftHandSocket"), ERelativeTransformSpace::RTS_World);
        FVector OutPosition;
        FRotator OutRotation;
        SoldierCharacter->GetFPSMesh()->TransformToBoneSpace(FName("hand_r"), LeftHandTransform.GetLocation(), FRotator::ZeroRotator, OutPosition, OutRotation);
        LeftHandTransform.SetLocation(OutPosition);
        LeftHandTransform.SetRotation(FQuat(OutRotation));
    }
}

it worked though

[meager spade]

im confused why you have a bool bWeaponEquipped and EquippedWeapon pointer

but yeah

[compact flame]

I have a power system for my game but you select your power in the main menu when your not in a server, whats a good way of relaying to the server what power you selected when you join one?

ive tried a lot of things

[quasi tide]

Depends on the game. But keeping the selection in like, the game instance, and then have the server request it generally works fine.

So the client stores the id in the game instance. On PostLogin, server version of the player controller does a client RPC to get the id of the selected power.

Then the client's PC does an RPC of that value. Then it updates on the server through the normal flow.

This process works fine in co op games or non-microtransaction type games.

Or simple stuff.

[compact flame]

Sorry to ask this, could you possibly take some pictures as an example? I think I did something similar but I wana see how you do it

[quasi tide]

I can't because I am not at my computer that has Unreal

[compact flame]

Ah

[haughty ingot]

How are you storing the data you want saved right now?

Pretty much every piece of advice someone would offer is some variation of what @quasi tide said

[compact flame]

Just took a bunch of pics

and it does not work

im prob missing something really important

[haughty ingot]

Okay so couple things:

Remember that a player controller generally exists for a local connection, and the server. So there will be two instances of it, both will call BeginPlay.

You have the first half right, you’re storing the information on the game state. But what needs to happen is after a client logs in, the server needs to request the information from the client. There’s some handy functions in GameMode to respond to login and ready events. So the order of events should be:

Some Post Login Function -> ClientRPC (to notify the client they need to send it to the server) -> ServerRPC (to actually send the data back to the server). -> Now the server has the data from the client.

Feel free to give it a try and just send more pictures

[compact flame]

So sould I move some events to the game mode?

[quasi tide]

Can't use Login. Need to use PostLogin. That is when it is safe to call RPCs

[haughty ingot]

I didn’t mean the function name u little pedantic bastard

[quasi tide]

Also - don't store the client's selection in the gamestate. That will get destroyed when connecting to the server.

[haughty ingot]

But yes

Honestly I use HandleStartingNewPlayer most of the time

[quasi tide]

Unfortunately, there is a function named Login, so it does kind of matter in this case 😛

[haughty ingot]

Depends how early the data is needed tho

[compact flame]

Never seen that node before

[haughty ingot]

There’s a couple more things that are available after that function call, but I can’t remember off the top of my head

Player state being one IIRC

[compact flame]

Sorry to be asking all these questions but its my first time trying to talk to a server without being in it at first lol, what part/ event should I be putting in the game mode and is the onpostlogin node or the handlestartingnewplayer node better

[haughty ingot]

This is a Discord to ask question, don’t apologize

[compact flame]

Yeah but it takes your time

[haughty ingot]

Look in your game mode class for a function named something akin to HandleStartingNewPlayer

[compact flame]

Yeah I got that

[haughty ingot]

IIRC it gives you the player controller, yes?

[compact flame]

Yes

[haughty ingot]

So make a new reliable client RPC in your player controller

[quasi tide]

Something to note - HandleStartingNewPlayer will be called during RestartPlayer as well (if I recall) and that can be triggered by you calling it as well.

It is also called after seamless traveling

Where as PostLogin is called only once

[compact flame]

Thats fine I dont reset them I just manually call resetting varuables as this game does not require respawning

[haughty ingot]

Both will probably work for your use case, it just depends on what you’re doing

[compact flame]

Also if you dont mind, I tick reliable when I need it to call 100% but what does it actually do? I dont wana tick it on some events if its not nessassary

[thin stratus]

Think it only calls during SeamlessTravel and PostLogin, or?

[quasi tide]

HandleStartingNewPlayer gets called after seamlesstravel

[haughty ingot]

Without getting in the weeds there’s a reliable RPC buffer, they will eventually make it through. But you can also clog it

[quasi tide]

PostLogin doesn't

[thin stratus]

Not what I meant.

[quasi tide]

RestartPlayer?

[compact flame]

ohhh, that makes sense

[thin stratus]

HandleStarting... is called for both PostLogin and PostSeamlessTravel.

And I think only for those two cases, not for RestartPlayer.

[haughty ingot]

There's some order of arrival as well, but I wanna stay on topic

[quasi tide]

Pretty sure I saw it call it a few weeks ago when I was looking at GameMode

[haughty ingot]

But don't call a reliable RPC on tick, that you have right

[quasi tide]

I'll double check here in a few.

Just in a work meeting

[haughty ingot]

That sounds right, been a while since I've looked

[thin stratus]

The main benefit of that node is that it calls for PostSeamlessTravel. Most peeps do stuff on PostLogin and then, when they need to use SeamlessTravel, their code falls apart.

[haughty ingot]

So you see how that says "Executes on all"?

That's not what we want

We only care to execute on the owning client

[compact flame]

It says that when I put it on mutlicast

[quasi tide]

Yeah - don't

[haughty ingot]

Right, we don't want a multicast

[compact flame]

Ah

[quasi tide]

You want to select "Client"

[haughty ingot]

m-dashes, he's AI confirmed.

[quasi tide]

False. These are the short dashes. AI does the long dashes. No one knows the long dash alt code by memory.

[compact flame]

There is no client option

[haughty ingot]

-_-

[thin stratus]

Looked at the pictures Tommy sent before. There is a whole lot of wrong knowledge to fix. Good luck!

[compact flame]

oh boy

[quasi tide]

But Cedric - that's where you come in. After all, don't you want another person to claim they learned all their networking from you??

[haughty ingot]

There is, it just isn't named "Client' literally

[thin stratus]

Given the pictures, they have either not read the Compendium or haven't read it often enough.

[compact flame]

Yeah its names multicast

thats what its on

[thin stratus]

Both cases mean I already solved their problems by writing it in the first place.

[haughty ingot]

Select the dropdown

[compact flame]

yeah

[haughty ingot]

Take a picture

[compact flame]

oh wait

[thin stratus]

https://tenor.com/view/i-am-a-generous-god-xerxes-300-youre-welcome-gif-19690831

[compact flame]

run on owning client

[haughty ingot]

There ya go

[compact flame]

lol

Im a little slow

[haughty ingot]

That's okay

[quasi tide]

You'll fit right in. Don't worry.

[haughty ingot]

https://www.dr-elliot.com/general/answering/

[compact flame]

I saw that

[haughty ingot]

Anyway

[compact flame]

Ur website is very well made

[haughty ingot]

"Made"

So now you have a way to notify the client when the server wants their data.

So call this RPC from the game mode in the function we talked about before.

[quasi tide]

Checked - you're right @thin stratus. HandleStartingNewPlayer is what actually calls RestartPlayer. So I had it flipped.

[quasi tide]

But PostLogin is still only called once.

[haughty ingot]

There we go

So go back to your "Tell Server Stuff on Multi" (it should be called something more like Client_SendXXXDataToServer or something

But that's besides the point

[compact flame]

Yeah Ill rename it

[haughty ingot]

So inside that "Tell Server Stuff on Multi", you're executing on the local player of the client that just joined. So you can now get your game instance, and grab the data you want

Send another picture when you get there

[haughty ingot]

So now make another RPC in the player controller that runs on the server, and that accepts your "AbilityOne" as an input.

[compact flame]

also reliable or no

[haughty ingot]

Sure

[haughty ingot]

So, that's pretty much it. Now you transferred data from the client to the server. Now you can send or do whatever you'd like with your RecieveAbilityDataFromClient, but that's on the server. So you could send it back to the game mode, or store it, or whatever. The main idea is now you have successfully asked your client to provide the server with some data. That's pretty much it.

I'm sure there's other stuff wrong with the pictures you sent, but this should get you going.

[compact flame]

Alrighty thanks a lot 🙂 I was struggling with this a for a while now now that I have most of it set I should be able to make it tie in, would casting to my character and calling another server event work? through the receive event?

Oh ya know what all that event does is call a blueprint interface event through the player state so I could just do that right through here

[haughty ingot]

I think now is the time to go back and really take a good read over some of the netcode documentation that's provided from Epic or third party. As @thin stratus mentioned, he has really nice compendium written up about how data moves around. I don't think me explaining it would do you any justice when these sort of resources already exist.

I think you may be confusing the context of which something is called from and then executed on. Because there are multiple instances of replicated objects, there isn't one game process that's running. Each individual connection is their own process, and the server's authoritative game is then replicated down to the clients, so the Server has an instance of a connections ACharacter, the server could also have an instance of their own ACharacter if it's running as a listen server. The point is that there is many different ways for things to get lost.

https://cedric-neukirchen.net/docs/category/multiplayer-network-compendium/

[lament flax]

other resources mentionned here https://notes.hzfishy.fr/Unreal-Engine/Networking/_Resources-(Networking)

[fallen dawn]

is there a way to have an animation blueprint for a charater that is in first person which is a bit deformed and then since the game is multiplayer, have another animation blueprint for the other players too see the character properly?

[fossil spoke]

Yes?

Just have 2 Anim BPs

And 2 Skeletal meshes

One for the Third Person

One for First Person

The TP SKM would just be the Character Mesh Component native to the Character class.

You would have to add a second for the FP SKM

You would want to set their respective OwnerNoSee and OnlyOwnerSee properties as well.

This is a very common setup for First Person games.

[fallen dawn]

Is this a UPROPERTY setting or where do i actually set it up?

[fossil spoke]

Yes, its a Render setting on the SKMs

[fallen dawn]

Also, is there a way to avoid of having 2 SKM and just have a single SKM one for the player and one for all the other players?

[fossil spoke]

There could be, but its probably going to be pretty jank.

[quasi tide]

Remember to handle attachments correctly as well

[fossil spoke]

Maybe some FP games that do "True" FP

Might use the same SKM

But its far easier when you have 2 separate ones.

[fallen dawn]

The way that i was thinking is just have inside the animation blueprint a bool value that does the switching, but how do i actually know which one is the current player and which one is the other player

[fallen dawn]

2 separate ones with bOwnerNoSee is the best you say, i will try that out aswell, thank you!

[fossil spoke]

"Best" isn't the word I would use. Its common, it works.

[fallen dawn]

I see, thanks

[obsidian ermine]

@fallen dawn You can do a TPS setup (single SKM) and use First Person Rendering

https://portal.productboard.com/epicgames/1-unreal-engine-public-roadmap/c/2073-first-person-rendering-beta-

[echo pasture]

anybody know if unreal has a timeout on the server for traveling players on a seamless travel? Or if somebody fails mid travel? Like for example, if someone is just taking forever to connect, or something happens and their game crashes during a travel, will GameMode eventually set NumTravellingPlayers to 0, or naw

[karmic briar]

Not really related to multiplayer but does anyone know if PlayerCameraManager can be used with GameplayCameraComponent?

[blazing bear]

I want a replicated array of bools, is TArray<bool> as fast as it gets?

[fossil spoke]

What do you mean by fast?

[blazing bear]

Like how fast it replicates

Honestly the max length the array can get is about 50

[fossil spoke]

Logout will be called for that Player who was dropped.

They will be removed from the NumTravellingPlayers

[verbal ice]

bitmask

[fossil spoke]

This is better, you want to pack your bools into a bitmask, replicate the bitmask instead.

[blazing bear]

I thought of that but I couldn't mark it as a uproperty

oh my bad I mean I tried TBitArray

Okay then I'll try that, thanks!

[verbal ice]

Could also wrap a TBitArray into a USTRUCT

And have a custom net serializer

whatever works best for your solution

[blazing bear]

That sounds nice too, I'll keep that in mind

[echo pasture]

I see, thanks

[echo pasture]

so in the game animation sample project, the client player controller is not valid in the Event_Possessed_Client . Anybody know what the issue could be?

[pliant cypress]

void UCombatComponent::EquipWeapon(AWeapon* WeaponToEquip)
{
    if (SoldierCharacter == nullptr || WeaponToEquip == nullptr)
    {
        return;
    }
    
    EquippedWeapon = WeaponToEquip;
    HandleEquip();
    EquippedWeapon->SetOwner(SoldierCharacter);
}

void UCombatComponent::OnRep_EquippedWeapon()
{
    HandleEquip();
}

void UCombatComponent::HandleEquip()
{
    EquippedWeapon->SetWeaponState(EWeaponState::EWS_Equipped);
    if (SoldierCharacter->IsLocallyControlled())
    {
        EquippedWeapon->GetWeaponMesh()->CastShadow = false;
        const USkeletalMeshSocket* HandSocket = SoldierCharacter->GetFPSMesh()->GetSocketByName(FName("RightHandSocket"));
        if (HandSocket)
        {
            HandSocket->AttachActor(EquippedWeapon, SoldierCharacter->GetFPSMesh());
        }
    }
    else
    {
        EquippedWeapon->GetWeaponMesh()->CastShadow = true;
        const USkeletalMeshSocket* HandSocket = SoldierCharacter->GetMesh()->GetSocketByName(FName("RightHandSocket"));
        if (HandSocket)
        {
            HandSocket->AttachActor(EquippedWeapon, SoldierCharacter->GetMesh());
        }
    }
}

how can i turn off shadow for local player

[thin stratus]

Is there something in the Engine that would cause runtime spawned components, that are renamed and properly link up between server and client in PIE, to not do that when running the same code in a build?

Kinda confused what the heck is causing the Component to not be net addressable outside the Editor. I can't run the project as Standalone or similar and packaging to test thing takes a long time, so I would much rather understand what the difference is. The only thing I can imagine is that "One Process" causes it to just "know" the Component magically.

[sage lance]

I suspect that its not getting packaged at all and the only reason it is referenceable is because you have opened it in the PIE. Maybe somewhere along the line in your asset management there could be a bug (eg. has blueprints true with a data asset). At least i have had similar issues.

[thin stratus]

They are runtime spawned. They won't be part of cooking, so I don't think that's it.

The mesh component can be accessed just fine from the Actor Pointer.

[sage lance]

More details would be cool. So you do something like begin play-> spawn component -> attach component -> set ref ?

[thin stratus]

They are pooled components. The pool is filled initially with a few of them. When a Character gets spawned a component is taken from the pool during PreInitComponents. That taken component is then renamed to a fixed name (CharacterMesh) and registered to that Character. Which in theory should mean it's stable named.

If it wasn't, I would have expected it to be crashing in PIE, but there the component survives the RPC.

[sage lance]

So this spawning is happening on the server? Are you replacing the default character skeletal mesh?

When does it crash in the standalone

[thin stratus]

It's happening on both.

[thin stratus]

It crashes cause I expected the Component pointer, which is part of a HitResult, so to survive an RPC and be valid on the Server.

So far, setting it to NetAddressable by hand seems to resolve it, which is fair and fine (although the renaming should have taken care of this).
The thing that doesn't make sense yet is why PIE doesn't have that problem.
PIE can def react to NetAddressable being wrong, as I've seen that happen countless of times with wrongly set up runtime meshes and stepping on them with the CMC.

When the component gets send to the server for the first time, it's not part of the ObjectToNetReferenceHandle Map yet, so it will be tested for being supported for networking.

And in there, it eventually lands in UObjectBaseUtility::IsDefaultSubobject ( cause everything else is false ), and further succeeds cause of ((UObject*)this)->GetArchetype() != GetClass()->GetDefaultObject(false).

The ArcheType of the Component returns the CDO of the Character, which the CDO of the class is the Component of cause. IsDefaultSubobject returns true for any object instanced using a non-CDO archetype.

So somewhere the pooling system is causing the archetype to be set to the Character CDO which is "wrong". And that seems to behave differently in packaged.

[quartz star]

Has anyone ever tried to make something like movement extensions in CMC like Fortnite?

Fortnite takes the custom NetworkMoveData approach but with a system within its CMC subclass to make it more modular: extensions can inject data into our NetworkMoveData and SavedMove subclasses. Some of the lessons have been applied in the design of Mover Plugin, i.e. composable inputs and state, but they are not available in the base CMC provided by UE.

[sage lance]

So you make the component on the client (from the clients pool) then send it through a rpc to the server? and the server spawns the character with the component?

[dark parcel]

Client may only know their own controller.

it doesn't know the server's or other player's controller.

[pliant cypress]

Can someone help?

[thin stratus]

No. The Character is spawned on the Server and replicated to the Client as normal. The Component is spawned upfront into a pool and then properly registered and assigned in PreInitComponents or whatever the function was.

I think I have it solved by now though. Not 100% sure why it's different between PIE and Build, but the Component is created with the Character's CDO's Component as a template, and that seems to cause it to resolve the Archetype, at least in PIE, the same way as the original Subobject. No clue why that fails in Builds, but we will just mark the Component as NetAddressable from now on, as the Stable Name doesn't seem to wanna work.

[echo pasture]

I meant in the rpc. so the client side. It's accessing it's own controller, not the server or another players

[obsidian ermine]

Probably because the character has been replicated down to the client.
Pop a 0.2 delay before firing the RPC as a troubleshoot.

[dark parcel]

use AcknowledgePosession instead for client. By the time the event is fired, the controller would be valid.

Event possesed is run on server and in your case the rpc follow. There's no guarantee if the controller already replicated to client by the time the RPC is run.,

AcknowldgePossession->IsLocallyControlled->Setup Input / camera, no need for RPC at all here tbh.

[halcyon ore]

Feels like i'm doing some somewhat cursed stuff, so curious if theres some weird function.

From an actor component.
Is there any functions for replication beginning/ ending.
But, they provide a controller its happening for?

Seems weird to me.
For client to RPC to the server, when a component is ready, when surely the server can know that, cuz it essentially has to tell the client?

[obsidian ermine]

It tells the client, but it doesn't know when the client gets the message.

[halcyon ore]

I don't care about "knowing"
Just, wish there was a server side version, that had a player controller of the player its being sent to.

Rather then my currently "cursed"
client gets its local PC, then I RPC through the PC, to then RPC to the origional actor component, to finally have the server do stuff.

So, I wasn't sure if a version of that existed, or not.

[dark parcel]

Server already have everyone PC, why does the client have to tell the server it's PC?

From an actor component standpoint, you can just find the PC of the owner by determining the outer.

[halcyon ore]

Cuz the actor component doesn’t have an owner.
But I need to rep only to specific clients.
So I do a cursed RPC loop.

Would just be nice to skip that first client goes back to itself step.

[obsidian ermine]

whats the class the AC is in?

How are you determining which player?

[halcyon ore]

AC is just on any generic actor.
It’s owner has no relation to what I’m doing.

Which player is determined by getting the clients local controller.

Just wondered if some weird function existed to skip the weird.
Server replicates to a player/ controller, and then has to immediately go the opposite way.
And just server has a function of like “sent component replication to”

[obsidian ermine]

Don't know of anything like that.

Client proxy of X Actor or Actor component -> Server proxy of X Actor or Actor component and vice versa.

[pliant cypress]

void UCombatComponent::EquipWeapon(AWeapon* WeaponToEquip)
{
    if (SoldierCharacter == nullptr || WeaponToEquip == nullptr)
    {
        return;
    }
    
    EquippedWeapon = WeaponToEquip;
    HandleEquip();
    EquippedWeapon->SetOwner(SoldierCharacter);
}

void UCombatComponent::OnRep_EquippedWeapon()
{
    HandleEquip();
}

void UCombatComponent::HandleEquip()
{
    EquippedWeapon->SetWeaponState(EWeaponState::EWS_Equipped);
    if (SoldierCharacter->IsLocallyControlled())
    {
        EquippedWeapon->GetWeaponMesh()->CastShadow = false;
        const USkeletalMeshSocket* HandSocket = SoldierCharacter->GetFPSMesh()->GetSocketByName(FName("RightHandSocket"));
        if (HandSocket)
        {
            HandSocket->AttachActor(EquippedWeapon, SoldierCharacter->GetFPSMesh());
        }
    }
    else
    {
        EquippedWeapon->GetWeaponMesh()->CastShadow = true;
        const USkeletalMeshSocket* HandSocket = SoldierCharacter->GetMesh()->GetSocketByName(FName("RightHandSocket"));
        if (HandSocket)
        {
            HandSocket->AttachActor(EquippedWeapon, SoldierCharacter->GetMesh());
        }
    }
}

void AWeapon::OnRep_WeaponState()
{
    switch (WeaponState)
    {
    case EWeaponState::EWS_Equipped:
        ShowPickupWidget(false);
        WeaponMesh->SetSimulatePhysics(false);
        WeaponMesh->SetEnableGravity(false);
        AreaSphere->SetCollisionEnabled(ECollisionEnabled::NoCollision);
        WeaponMesh->SetCollisionEnabled(ECollisionEnabled::NoCollision);
        break;
    case EWeaponState::EWS_Dropped:
        if (HasAuthority())
        {
            AreaSphere->SetCollisionEnabled(ECollisionEnabled::QueryOnly);
        }
        WeaponMesh->SetSimulatePhysics(true);
        WeaponMesh->SetEnableGravity(true);
        WeaponMesh->SetCollisionEnabled(ECollisionEnabled::QueryAndPhysics);
        break;
    }
}

void AWeapon::SetWeaponState(EWeaponState NewState)
{
    WeaponState = NewState;
    switch (WeaponState)
    {
    case EWeaponState::EWS_Initial:
        break;
    case EWeaponState::EWS_Equipped:
        ShowPickupWidget(false);
        WeaponMesh->SetSimulatePhysics(false);
        WeaponMesh->SetEnableGravity(false);
        AreaSphere->SetCollisionEnabled(ECollisionEnabled::NoCollision);
        WeaponMesh->SetCollisionEnabled(ECollisionEnabled::NoCollision);
        break;
    case EWeaponState::EWS_Dropped:
        if (HasAuthority())
        {
            AreaSphere->SetCollisionEnabled(ECollisionEnabled::QueryOnly);
        }
        WeaponMesh->SetSimulatePhysics(true);
        WeaponMesh->SetEnableGravity(true);
        WeaponMesh->SetCollisionEnabled(ECollisionEnabled::QueryAndPhysics);
        break;
    case EWeaponState::EWS_MAX:
        break;
    default:
        break;
    }
}

void AWeapon::OnRep_AttachmentReplication()
{
    // Empty
}

it was working fine before, don't know where i messed up

[meager spade]

this feels weird

why would you drop the actual weapon

why is weapon dealing with pickup widgets

[pliant cypress]

It is just for now since I'm not working on UI. I'll replace it with HUD class

Rn, that weird Simulated proxy behaviour is my worry

[meager spade]

its nothing to do with HUD class

its just odd way to do this, most of the time when you drop a weapon you spawn a pickup actor that represents the weapon, and it doesnt control anything with UI]

but you havent even stated the issue

video has no context, what am i looking at

why are you skipping attachment replication

the way i did FPS when i was messing around, was you spawn the thirdperson weapon just locally (never on server)

the first person weapon is spawned on the server

[pliant cypress]

Weapon is the only one. It isn't spawned, but placed in the world. Once the player presses F, it'll pickup weapon on FPS mesh for local and TP mesh for others so that's why OnRep is being override so it doesn't messes with attachment.
Then, it was working but now it broke and I don't understand why it happens when I didn't even change anything in Equipping functions.

[pliant cypress]

OnRep_AttachmentReplication is overrided and empty so that OnRep_EquipWeapon can EquipWeapon can manage attachment respect to locally controlled but it is not.

[karmic briar]

https://www.youtube.com/watch?v=5LRaazpelYM : GAS+NPP 🔥

[lament flax]

I forgot, what vars made by the user in a player state subclass are automatically copied over the new player state on travel ?

i assume nothing if absolute

[neon stone]

Does UE5 have built in client side prediction?

[lament flax]

for what ?

[neon stone]

For multiplayer games? I dunno what you mean for what.

[lament flax]

you implement the prediction yourself for your custom systems, UE system such as GAS, the CMC or physics already implements some prediction

[haughty ingot]

He’s asking because it’s a really broad question to those who use the engine, there are individual things in the engine that already come with some forms of client prediction, but whatever you do on your own doesn’t have any concept of prediction or rollback

[neon stone]

Ok.

Sorry.

Got it.

Another question, for the Steam sockets plugin, do I need to enable anything else to have them work, and must I have anything disabled to ensure it works?

I hope I don't come off too green.

[lament flax]

im playing with physics and networking for the first time and i got some sync issues between the server and clients

basically im using the vehicule template, where the player character is a vehicule with simulated boxes in a "trunk"
if i move around (either on listen server or client) if i bump around the map some boxes will drop down, but this isnt synchronized between both bodies

i know physics replication can be really nasty to do, especially when all clients interact with the same bodies, but here only 1 player is interacting with the bodies

can it be that the Vehicule Movement Components dont have any movement prediction like the CMC which cause the vehicle to be at different locations/rotations on each machine, meaning the physic simulation is played differently ?

[pliant cypress]

@thin stratus can u please help? Last time i override OnRep_Attachments and it fixed but this is again happening and i didn't changed the code.

[dark edge]

Are you saying on one machine a box might bump out, and on the other it might not?

[lament flax]

yeah

[dark edge]

You probably don't have any replication on the boxes at all

[lament flax]

for example on client i push the boxes down, and on server they are still in the trunk

[lament flax]

i have "comp rep" enabled on the boxes

not on character

[dark edge]

is each box its own actor?

[lament flax]

nope, comp in character BP

[dark edge]

show the setup

[lament flax]

uh, i missed the rep bool on some boxes

it "works" now

but the boxes jitter a lot on the client

[dark edge]

yes because component-level replication of transforms is pretty barebones, it just hard-sets their location periodically.

If you make the boxes actors and spawn them at runtime you can make them replicate their movement smoother

Make a box actor and play with it, get it to move smoothly on server and client but also always respect what the server says. You can test the corrections by just applying impulses serverside.

Begin Play -> switch has authority -> delay -> some random impulse

Get that to work. For your test rig just have one up in the air in the level so it drops and bounces around

On server you should see a drop box, then a bit later yeet in some direction.
On the client you should see the same, but the yeet should come after the server does as a correction.
Fiddle with the physics replication coefficients to make it as loose or as tight as you want. The default settings are VERY strict.

And always test with network condition emulation on

This showcases a bit of a cool way to debug, on tick in your actor, draw some debug shapes with different colors for authority or remote.
https://www.youtube.com/watch?v=0X7yCnfye3c

[lament flax]

thanks a lot !

[haughty ingot]

This reminds me of Garry’s Mod

[dark edge]

Exactly what I'm going for.
Specifically GMod + WireMod + ACF

The most direct inspiration is the old WireMod and ACF servers I used to play on

The problem with ACF is it's not much of a "game", if you know what you're doing you can just make arbitrarily powerful vehicles and there's no structure really. It's more of a sandbox.

[nova wasp]

I was playing Mars First logistics which is a good game but just a bit too simplistic compared to gmod stuff
it's a good example of a building game that tries to add a little bit of structure though

mostly about trying to lift and carry weird objects around

for example at first you have rather lightweight boxt objects that are simple to just push

but later on you get complex shapes that are delicate or have to be kept upright

for example a crate of apples that needs to arrive at the destination with all apples inside the crate

[verbal dust]

why doesnt this work on client for me?

[crisp shard]

that will return the controller, you need to use 'get owning player pawn'

unless that is your controller

it does say PC, so nvm lol

but you are sending a server rpc, and asking about client, so not sure what you're trying to do, but it wouldn't necessarily happen on that client, the client is just sending a server rpc, and the server will whatever that fucntion is doing

[verbal dust]

oops forgot to add,

[crisp shard]

i am a tad confused on why you are doing some things... but if you're trying to set the player location, it should work but ngl the get all actors of class, and getting at index 0 setting it , and then using it as a point to get the location / rotation seems unnecessary, but i dont think that would effect the issue

do you have mutliple player starts ? or just 1 ?

[dark edge]

If you're in the multiplayer context you should be going through the GameMode

in which case you can just call RestartPlayer and it'll do what it did the first time

[verbal dust]

cant remember honestly 😅 I'm coming back to this after a while trying to figure out why it works on the host but not client

[dark edge]

Breakpoint it, this looks like it should work

[nova wasp]

curious if GetOwningPlayer is resolving

idk if you have to do something special when adding the widget to make that always correctly resolve

[dark edge]

yeah i think its failing early

[verbal dust]

I think its all triggering correctly

actually

it might be because I've got client authority on movement

[dark edge]

yeah probably

[verbal dust]

so I need to execute on client

[dark edge]

yeah no need to do anything fancy here, just locally execute if that's the case

try it

[verbal dust]

yup that works 🤣

[verbal dust]

does restartPlayer also reset all the pawn variables?

[dark edge]

Probably by default but there's probably some tweakable settings in it

It's just that putting a pawn at a playerstart is kinda GameMode's whole thing

[verbal dust]

yeah I've never really had any idea what its for, I didnt know there were nodes like RestartPlayer available in it

[dark edge]

gamemode is what hands you your pawn to begin with

its the boss

[verbal dust]

hmm it does not, which i would like to have for debug.

but i think i just have to destroy the ppawn and possess a new one for that

[dark edge]

I'm pretty sure it totally nukes the pawn

[pliant cypress]

Can anyone please help?

[thin stratus]

Have you placed some UE_LOGs to check if the functions call the way you expect them to call and if the values are correct?

Your OnRep_ filtering for HasAuthority would only make sense if you call the OnRep by hand on the Server.
In C++, OnRep is only called by Clients.

Instead of duplicating your switch-case in SetWeaponState and OnRep_WeaponState, you could simply alter SetWeaponState to call OnRep_WeaponState after setting it for example.
Then the HasAuthority would make sense again.

[nova wasp]

(nothing wrong with manually calling an onrep on the server though, that's okay to do)

[thin stratus]

Or, fwiw, if you spawn the weapon locally, but I don't think you do.

[thin stratus]

The upper part of the code is probably more relevant. The one with the Attach code.
Can you place some logs into HandleEquip? Maybe into the if (IsLocallyControlled()) and the else of that?

Do you have the same issues on ListenServer and on Clients or only on one of them or maybe "a" problem but not the same?

And when do you call EquipWeapon?

[pliant cypress]

yes, in new code i've placed UE_LOG on both OnRep and Equip.
And it does print FPS MESH indicating attached to FPS MESH but visually, it doesn' instead attaches to TP Mesh

[pliant cypress]

happening on all including client & server

[thin stratus]

Btw, in your upper code you are doing this, but you wrapped the logic into HandleEquip. You could just put that into the OnRep if you don't plan to call HandleEquip from anywhere else and replace the HandleEquip calls with the OnRep :D

[nova wasp]

you should add GetDebugStringForWorld(World) so that you actually know which callers are doing something

you say you added a log and then say "it printed"

this is the part where you have to figure out WHICH ONES actually did WHICH PATH

[thin stratus]

Yeah, that would be helpful to add to the Logs. Also would be nice if you could actually show the logs printing etc.
It's difficult to help like this, cause we can never be certain that you are reading the log results "correctly".

[pliant cypress]

yes doing that

[nova wasp]

it's honestly frustrating there isn't some pinned thing that describes some basic debugging stuff

[thin stratus]

tbh, the Output Log should just not print into one and the same f*cking window.

[nova wasp]

some stuff I think is kind of just "you should know what a breakpoint is" (not that it's easy to figure that out without context) but it's insane how many useful debugging watches there are epic advertises none of

[thin stratus]

Give it a tab per instance, even under "one process" and maybe even try to sync them up by some ServerTime..

[nova wasp]

how would it determine the right window on a task thread in a one process mp world

what happens if its from an asset load callback?

this is kinda unfortunately not so simple unless you abuse GWorld like I do (and even that is REALLY really silly and only works for simple ticking things)

[thin stratus]

A tab that prints GT World related stuff should be fine?

That's where 99% of the gameplay logic will happen anyway.

[nova wasp]

yeah, I think there should just a a "ulog that is only from a uobject"

or something

that should be the default one

[thin stratus]

I do have a function that grabs the world out of thin air and I trace projectile stuff with that similar to how Insights traces work.

[nova wasp]

ofc we need a raw statics one as well but it does not make sense to have 0 context in a default log when the context is almost always there

[thin stratus]

Not pretty but I can easily trace data even in a random struct function that has no concept of the world.

[nova wasp]

yeah, I already mentioned GWorld

it's a global static

[thin stratus]

The logging can always report which thread it is on

[thin stratus]

You can't rely on that iirc, cause it's not always set.

[nova wasp]

I can because I only do work from tasks waited on in a tickable world subsystem

[thin stratus]

It's set during the time the world is currently being processed iirc.

[nova wasp]

it would not work for EVERYTHING

but it does work for my game code

anything on a module level ofc would not work

[pliant cypress]

i hate clyde, wouldn't let me share whole message at once

[thin stratus]

Yeah Discord sucks with code stuff somethimes.

Like what are they defending us from?..

[pliant cypress]

void UCombatComponent::EquipWeapon(AWeapon* WeaponToEquip)
{
    if (SoldierCharacter == nullptr || WeaponToEquip == nullptr)
    {
        return;
    }

    EquippedWeapon = WeaponToEquip;
    EquippedWeapon->SetOwner(SoldierCharacter);
    EquippedWeapon->SetWeaponState(EWeaponState::EWS_Equipped);
    if (SoldierCharacter->IsLocallyControlled())
    {
        EquippedWeapon->GetWeaponMesh()->CastShadow = false;
        const USkeletalMeshSocket* HandSocket = SoldierCharacter->GetFPSMesh()->GetSocketByName(FName("RightHandSocket"));
        if (HandSocket)
        {
            HandSocket->AttachActor(EquippedWeapon, SoldierCharacter->GetFPSMesh());
            UE_LOG(LogTemp, Warning, TEXT("DebugString: %s"), *GetDebugStringForWorld(GetWorld()));
            UE_LOG(LogTemp, Warning, TEXT("FPS Mesh"));
        }
    }
    else
    {
        EquippedWeapon->GetWeaponMesh()->CastShadow = true;
        const USkeletalMeshSocket* HandSocket = SoldierCharacter->GetMesh()->GetSocketByName(FName("RightHandSocket"));
        if (HandSocket)
        {
            HandSocket->AttachActor(EquippedWeapon, SoldierCharacter->GetMesh());

            UE_LOG(LogTemp, Warning, TEXT("DebugString: %s"), *GetDebugStringForWorld(GetWorld()));
            UE_LOG(LogTemp, Warning, TEXT("Mesh"));
        }
    }
}

void UCombatComponent::OnRep_EquippedWeapon()
{
    EquippedWeapon->SetWeaponState(EWeaponState::EWS_Equipped);
    if (SoldierCharacter->IsLocallyControlled())
    {
        EquippedWeapon->GetWeaponMesh()->CastShadow = false;
        const USkeletalMeshSocket* HandSocket = SoldierCharacter->GetFPSMesh()->GetSocketByName(FName("RightHandSocket"));
        if (HandSocket)
        {
            HandSocket->AttachActor(EquippedWeapon, SoldierCharacter->GetFPSMesh());
            UE_LOG(LogTemp, Warning, TEXT("ONREP FP Mesh"));
        }
    }
    else
    {
        EquippedWeapon->GetWeaponMesh()->CastShadow = true;
        const USkeletalMeshSocket* HandSocket = SoldierCharacter->GetMesh()->GetSocketByName(FName("RightHandSocket"));
        if (HandSocket)
        {
            HandSocket->AttachActor(EquippedWeapon, SoldierCharacter->GetMesh());
            UE_LOG(LogTemp, Warning, TEXT("ONREP Mesh"));
        }
    }
}

[nova wasp]

they are two separate logs so now I have to make a mental mapping between these 3 things

okay

[thin stratus]

Two things about the code, before we talk about the logs

[pliant cypress]

couldn't understand? use hasauthority in setweapon state so only server does that?

[nova wasp]

for starters it does not make sense to silently fail to find the socket

[thin stratus]

1. WeaponState is replicated based on your other code, why is the Client calling SetWeaponState in the OnRep?
2. You are still duplicating the code. Just put all code that should be called on Server and Client into the OnRep and call the OnRep by hand after setting EquippedWeapon in EquipWeapon.

[nova wasp]

unless you intend for that

[thin stratus]

The HandSocket failing silently could be a problem, yes.

But we would see that in a missing log atm I guess.

[nova wasp]

also I'm super confused about which component is for what

// is this the tp weapon mesh? why is this one not interested in casting shadows? how can someone reading this determine that?
        EquippedWeapon->GetWeaponMesh()->CastShadow = false;
        const USkeletalMeshSocket* HandSocket = SoldierCharacter->GetFPSMesh()->GetSocketByName(FName("RightHandSocket"));

[pliant cypress]

when i set weaponstate to equipped only on Equip and not OnRep, this happens

Attempting to move a fully simulated skeletal mesh /Game/Maps/UEDPIE_1_PrototypeLevel.PrototypeLevel:PersistentLevel.BP_Weapon_01_C_2.WeaponMesh. Please use the Teleport flag

[thin stratus]

WeaponMesh is the one and only mesh of the Weapon.

FPSMesh and Mesh are of the Character.

WIth Mesh being ThirdPerson, the native one I assume

[pliant cypress]

Mesh - Full body
FPS_Mesh - arms msh

WeaponMesh - Single, root component of AWeapon

[thin stratus]

Right, probably cause you build yourself a race condition.

By using 2 properties and 2 OnReps to do similar work.

[nova wasp]

why is the skeletal mesh simulated anyways

and yeah onreps are going to not come in at the same time

[thin stratus]

They can drop the Actor physically to the floor I guess.

[nova wasp]

make 1 holy struct that describes the state. Do not rely on random property ordering

[pliant cypress]

yes

[thin stratus]

btw, you don't want that to be physics driven. If you want to "throw away" the weapon, try looking into the ProjectileMovementComponent.

It is a "PROJECTILE" MovementComponent, but you can use it for whatever you want.

Shitty name tbh

[nova wasp]

its not horrible to do as a starting setup imo

they just need to not simulate and THEN move it without forces

[pliant cypress]

i am actually trying to make COD style movements and weapon so i setup physics for it

[nova wasp]

how does cod use physics for the weapon?

I am confused

[pliant cypress]

dropping

[thin stratus]

Yeah i get it. That just doesn't sync well over network. Server and Client might end up with the weapon in different places.

You can enable MovementReplication but that might cause jitter then.

That's why I suggest to use the ProjectileMovementComponent a that can do the "throw away" stuff even with "bounces" and what not and has logic for interpolation.

Unless that does not at all work for you.

But that's a different topic. Was just an FYI.

[pliant cypress]

sure but rn, i gotta get fix the attachment

[nova wasp]

this is probably a bit too much to take in considering we are still dealing with just hiding the weapon in fp (nothing wrong with that, just don't want to get confused between 2 things)

[thin stratus]

Prints look correct I believe.

[pliant cypress]

yes

that's why i am not able to understand where the error happens

[thin stratus]

Yeah, I have that problem of spotting potential issues and pointing them out :D Sorry!

[nova wasp]

it's a good idea I think, just saying lol

[thin stratus]

The problem is mainly the FPS version of it?

Is it wrong in the picture as well? It does look wrong but with placeholder stuff I'm sometimes not sure .D

[pliant cypress]

for locally control, the weapon should be attach to FP

[pliant cypress]

when u see from FP, the weapon is in air but when i detach from the mesh. i see that weapon is attach to TP

[thin stratus]

In your video from the original post, it's inverted.

[pliant cypress]

so basically, even for locally control weapon has started attaching to TP Mesh

[pliant cypress]

yes

i did some changes

clean build again

UE_LOGs

[thin stratus]

Okay.

[pliant cypress]

remade BP_Weapon

[thin stratus]

You are restarting the editor every time you do C++ changes?

[pliant cypress]

no, unless i do some major changes

for small update, bug fixes. i use live coding

[thin stratus]

Hm. Keep in mind that it's not about the size of the changes, but what exactly you are changing.

Live Coding is fine, but you can't "hot reload" header changes with it.

Mostly only cpp changes fwiw.

Do adding/removing functions and properties is usually not supported.

[pliant cypress]

yes. Whenever i make new class, or interconnect functions or make complex system. i restart

[thin stratus]

Changing the implementation of a function is fine. Touching the constructor is probably a no-no

Yeah, strange. Not entirely sure what this coudl be atm.

[pliant cypress]

last time it worked when u told me to override the OnRep_AttachmentReplication

[thin stratus]

You already changed the Attachment OnRep from last time, which should remove this problem.

[pliant cypress]

then i added Sprint, Left Hand IK, Crouch

though it was working finely till Left Hand IK

[thin stratus]

When are you spawning the Weapon?

[pliant cypress]

i just place it in world

go over it and pick up

[thin stratus]

You pick it up?

[pliant cypress]

yes

[thin stratus]

Are you using Source Control for your project?

[pliant cypress]

Github

[nova wasp]

you don't need to use github, you can just host a git locally

if that helps

[thin stratus]

Have you considered reverting some changes to see if that resolves it again?

[nova wasp]

which is kinda how it works anyways

[thin stratus]

Cause we don't know what changes you've done that could have broken it outside the code parts

[pliant cypress]

deleted my source and downloaded and paste the last source from github

didn't fixed

regenerated VS files

[thin stratus]

If you are using GitHub, you are probably not Source Controlling your Assets.

Those are most likely the more important thing to keep revisions on cause those break a lot easier and can't simply be restored.

[nova wasp]

curious what GetFPSMesh is attaching to

or if something else is overwriting the attach

[pliant cypress]

ASoldierCharacter::ASoldierCharacter(const FObjectInitializer& ObjectInitializer) : Super(ObjectInitializer.SetDefaultSubobjectClass<USoldierMovementComponent>(ACharacter::CharacterMovementComponentName))
{
     // Set this character to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
    PrimaryActorTick.bCanEverTick = true;

    bUseControllerRotationPitch = false;
    bUseControllerRotationRoll = false;
    bUseControllerRotationYaw = true;

    GetMesh()->bOwnerNoSee = true;
    GetMesh()->bOnlyOwnerSee = false;

    SoldierMovementComponent = Cast<USoldierMovementComponent>(GetCharacterMovement());

    ViewCamera = CreateDefaultSubobject<UCameraComponent>(TEXT("ViewCamera"));
    ViewCamera->bUsePawnControlRotation = true;
    ViewCamera->SetupAttachment(RootComponent);

    FPS_Mesh = CreateDefaultSubobject<USkeletalMeshComponent>(TEXT("FPS_Mesh"));
    FPS_Mesh->SetFirstPersonPrimitiveType(EFirstPersonPrimitiveType::FirstPerson);
    FPS_Mesh->bOnlyOwnerSee = true;
    FPS_Mesh->bOwnerNoSee = false;
    FPS_Mesh->CastShadow = false;
    FPS_Mesh->SetupAttachment(ViewCamera);

    Combat = CreateDefaultSubobject<UCombatComponent>(TEXT("CombatComponent"));
    Combat->SetIsReplicated(true);

    GetCharacterMovement()->MaxWalkSpeed = 250.f;

    NetUpdateFrequency = 66.f;
    MinNetUpdateFrequency = 33.f;
}

[thin stratus]

Different topic again, but you should consider using something else than GitHub, as that limits your LFS stuff to a few gigs, which means you aren't actually saving the assets I assume.

[pliant cypress]

okay

[thin stratus]

I don't really think there is anything wrong with the Attachment Code atm.

[nova wasp]

I wonder if OwnerNoSee can handle attached things changing

I would be curious to see what is actually being attached to what

[pliant cypress]

there is no solution?

do i need to remake the project?

[thin stratus]

There is always a solution. Remaking the project is almost never the answer :D

[nova wasp]

debug who is attaching it

[pliant cypress]

how?

[nova wasp]

a breakpoint in attachment

that way you can see who changes it

even if its not this code

[thin stratus]

We are just reaching a point where we can't help much. If I were in your position I would breakpoint the Attachment-code and step into it to see what is happening in UEs code.

[nova wasp]

just add a breakpoint in AttachActor

this is to see if someone else is changing the attachment

learning how to debug is really really important

this stuff sucks to do beacuse there can be some unintuitive things that can change the result but verifying your assumptions can help narrow down what happens

[thin stratus]

The logs show that the Weapon should be attaching to the right socket on the right mesh on the Client vs Server.
If it still fails, then you gotta check what is happening on Epic's end.

Also are you sure the stuff you did with the IK isn't moving the Socket or Bone or so and the Attachment is in fact working fine?

[nova wasp]

not what I meant... read my message about where the breakpoint is please

but you are on the right track

[pliant cypress]

ohk

[nova wasp]

make sure you have debug symbols

[pliant cypress]

i don't have it?

[thin stratus]

Are you able to breakpoint within AttachActor and does it hit the breakpoint? :D

[dark parcel]

When a client join and a dynamically spawned replicated actor is spawned on the client machine.
Is the state guaranteed on begin play?

For example, if I have a replicated boolean, bChestOpen in a replicated actor.

If the server, sets the bChestOpen to true.

Then later on a client join the game, 1 minute after.
On the replicated actor begin play will bChestOpen guaranteed to be true for client?

For context, I just want to make the chest mesh open / close depending if it's already opened in the server by the time the client join.

Asking cuz I still have to figure out how to test as late joiners in editor.

[thin stratus]

If not, then you gotta install the symbols still.

[nova wasp]

I think it depends on the initial bunch

seems simple enough to just onrep it, no?

[thin stratus]

It should be replicated as part of the initial bunch, so yes. State for LateJoiners is handled via OnReps usually.
You may find that an OnRep calls before BeginPlay, at which point you might need to handle the Race Condition.

[pliant cypress]

yes

just hit the breakpoint

on EquipWeapon, the hit was on TP_Mesh

OnRep it was on FPS

[nova wasp]

I have no clue if that's good or bad lol

[dark parcel]

that's what I want to do initially, but then animation may be called twice since I do multicast for the act of opening the chest atm.

[nova wasp]

I mean adding it inside of attachactor, not just on that line
but it being on that line can be helpful too

[dark parcel]

thingking when I can use OnRepCondition InitialOnly

[nova wasp]

it should be both or a timestamp based onrep

[thin stratus]

Yeah I mean we expect that from the prints, but you are meant to step into the function or even put the breakpoint into it.
You should debug what the ENGINE code is doing.

[nova wasp]

yeah the reason we are trying to see who else is calling AttachToActor

just in case something else is overriding your code later

[pliant cypress]

i juate placed the breakpoint at end of AttachActor() function and it didn't hit

[nova wasp]

prefer placing it near the first few lines if possible

in case it early outs

I might change my answer to USceneComponent::AttachToComponent

[pliant cypress]

found something

[nova wasp]

you might want to mute the breakpoint until after beginplay though as it will be called dozens of times

[pliant cypress]

doing it

[pliant cypress]

i am using another function

not hitting the breakpoint

[nova wasp]

its not active

idk what this warning means but I assume its not reachable/resolved

[thin stratus]

No symbols :D

Pretty sure you skipped installing them inside the options when you installed the engine.

Open your Epic Games Launcher, go to the list of installed Engines and click the dropdown next to the one you are using. Check the options and see if you downloaded the symbols.

[nova wasp]

I will see if I can make a short wtf-is-going-on for how to debug stuff some time

it is really dire how many people miss this stuff... it's not really their fault though becuse no unreal docs or courses will teach this

because they all assume you somehow learned this from... somewhere

not to mention the crazy unreal-specific watches and natvis

[thin stratus]

It's mostly that peeps head into coding C++ for Unreal without ever learning how to actually debug C++ code properly.

[nova wasp]

I am one of those people I guess

idk when I figured out what a breakpoint is lol

[pliant cypress]

downloading

[thin stratus]

Yeah, I had this stuff at University. So I was a bit more lucky :D

[pliant cypress]

ik C++. just multiplayer is getting hard for me. especially the FP/TP setup

the other multiplayer game wasn't hard when i developed

but wasn't that much complex though. Easy to debug even with breakpoints

[pliant cypress]

@thin stratus Debugging symbols downloaded

what's the next step?

i found something

i downloaded my last commit

and it was working fine

[ocean swallow]

I’m working on a throw/spawn mechanic in a UE5.6 multiplayer project. The setup is shown in the image: the spawned items have Replicate and Replicate Movement enabled.
The issue I’m encountering is that after throwing, only the server sees the item flying correctly. On all clients, the item appears at the spawn location and immediately falls down, regardless of which player threw it.
Additionally, small items, like flashlights, sometimes clip through geometry and end up below the floor.
Has anyone experienced this before? How can I ensure that clients see the same thrown trajectory as the server and avoid these clipping issues?
Translated from GPT

[nova wasp]

for stuff falling through the floor you want to enable CCD for them (continuous collision detection)

also I am not sure why you want to get component by class for the spawed actor. Is the physics primitive component not just on the blueprint?

[ocean swallow]

this?

[nova wasp]

I am not sure what you are referring to about the two things I said

also curious to see what p.VisualizeMovement 1 shows (console command)

also I do not think I like searching for a random primitive component on this... just use the root static mesh component of the flashlight. Searching for this dynamically does not make sense as you will want to apply to the root component every time I think

I don't know exactly how the flashlight works though

Apologies if anything I said here is difficult to translate, if it is hard to understand I can rephrase it

[ocean swallow]

The class comes from the item data of the inventory system.The type of items placed is not fixed

[nova wasp]

in that case then use the root component and cast it to a primitive

[ocean swallow]

like this?

[nova wasp]

yeah, assuming it actually is a primitive component

which it should be imo

[ocean swallow]

Now it can only fall where it is.

[nova wasp]

Is the root component a primitive component or not?

[ocean swallow]

What's that meaning?

[nova wasp]

make the item the root component

you might have to move it around relative to the socket now... not sure if this will change the physics replication

[ocean swallow]

um I think I don't know how to do that.

[nova wasp]

it might help to do some beginner tutorials first but if you somehow missed this you should be able to change it by dragging the Item static mesh component on to the current root component (DefaultSceneRoot)

[ocean swallow]

it's work!! poggers

[nova wasp]

I think the reason why is that movement replication uses the root component

it might be annoying to offset the flashlight in the hand now but you should do this for most actors like this if possible.. the root should be the thing that has their collision and physics

[ocean swallow]

But it still sometimes goes through the floor and under the floor

[nova wasp]

did you read my message about CCD?

[ocean swallow]

i can't find that

[nova wasp]

ah sorry, I should link it so you can translate it easier: #multiplayer message

[dark parcel]

https://d3kjluh73b9h9o.cloudfront.net/original/4X/f/c/c/fcc484a8c16448ee1f728812401e6666ee997e8f.jpeg

[ocean swallow]

🛐 All problems solved thanksss

[nova wasp]

CCD is not free as it will make things slightly more expensive to move but for something this important it's a good idea I think

[ocean swallow]

I can't change the position in the blueprint.
Because there is no root?

[nova wasp]

the root IS the static mesh

there is nothing for it to be relative to

because it IS the root component

if you attach it to something else it can be relative to that, like the character's hand

you could also change the origin of the static mesh itself you wanted to with the static mesh editor tools

you could change the root to a collision component like a capsule collision and move it relative to that if you wanted to?

[ocean swallow]

I think I'll choose this approach

But I don't know how to do it yet

oh,I first create a root and then move it and delete the root

[lyric heart]

i've been doing some stuff with multiplayer and i have not find much on these connections

i see i can do a listen server real easy and just forward ports but i don't want users to have to forward and all that

so i been looking into steam

and it works really well

are there any other alternatives ?

i know there is also EOS that you can use through steam ?

what do people normally use is the question ? like whats the standard way of doing the networking ?

[dark parcel]

The standard way is to make it convinience for your target base.

Having the user to portforward them self will easily delete your target audience.

You want to handle the connection proccess, I think steam use NAT or w/e it's called.

[lyric heart]

ya it's just a bad idea this but easiest to do

[dark parcel]

but at the end of the day, the end user just need to press host. And other players can click join.

[lyric heart]

right

[dark parcel]

how it happend at the backend is up to you to implement

I'm a simple man, if I don't get dedicated server working, i will just use steam sessions.

but dedicated or not, I will still publish the game on steam.

[lyric heart]

right so i can have a dedicated server

where i'm the only one who has to forward the ports

thats not a bad option

i just worry about power outages, downtime with this

steam seems to be the best way to go tbh

[lyric heart]

lets say i got a steam account and setup an appid, can i do this with just a prototype ?

i just want to use the networking stuff and not publish the game through them

[dark parcel]

You can use services like AWS.

there you can make a fleet of servers, or even better, instances on demand.

So you don't get charged for idle servers.

As for steam, you can use the default app id 480, space war to test your game.
That's what it's for.

The downside is you will see other people sessions as well, since there are other devs testing with it. But then you can also filter with specific param so you can display only the session from your game.

[lyric heart]

i mean i can't just have a demo that uses this 480 ?

like even for testing

[dark parcel]

You can but not for public.

"demo" in what sense? need more context here.

[lyric heart]

right so like i can send to a friend

[dark parcel]

if it's demo open for public then I believe no.

[lyric heart]

just a prototype

[dark parcel]

Yeah, you can do this.

[lyric heart]

a demo for people to test yes

[dark parcel]

Don't even need to build for shipping, you can build with development target.

Share the executable with friends.

[lyric heart]

isn't that making it public ?

or what exactly is public ?

[dark parcel]

no

you have to pass the game to them via USB or other link.

Making it public means you have your own app id.

and people can just download the game via steam.

and get the update via steam.

[lyric heart]

i think i will eventually get an app id

[dark parcel]

If you don't have your own app id, you will just have to copy the game to spare laptop.

Yea it's like $99, I'm not that broke.

[lyric heart]

in this case it seems worth it to have the multiplayer stuff all built in like that

[dark parcel]

built in like?

[lyric heart]

where it shows teh game your playing, and you can invite and stuff

thats awesome

[dark parcel]

If you are using the test , it will show up as SpaceWar

[lyric heart]

yes it does

it works

[dark parcel]

if you have your own app id, it will show your game name.

also you can send Beta Keys

so you can just deploy your game anytime you need to update.

Then your players can just update the game via steam.

Free version with Space war means, you will have to copy the game, everytime you did an update, no matter how small.

[heavy hound]

https://www.reddit.com/r/unrealengine/comments/1nnim4n/replication_issues_while_using_event_dispatchers/

It seems like a super simple replicaiton issue. But I'm just not able to figure it out

The thing, that seems to bother me is the "Event dispatcher does not seem to work"

If anybody can help, that would be amazing!

[thin stratus]

How are you binding to the dispatcher?

[heavy hound]

https://www.canva.com/design/DAGzsnmJIZg/4r323YiIZflQd90j_rBmbg/view?utm_content=DAGzsnmJIZg&utm_campaign=designshare&utm_medium=link2&utm_source=uniquelinks&utlId=h4e76855f95

[heavy hound]

Screenshot

[dusk lodge]

does anybody know if anim notify state-based triggers for gameplay stuff like combos, input buffers, melee scans etc is viable for multiplayer pvp? not sure if server corrections/desync will cause notifybegins to skip for example, hearing conflicting info

[dark parcel]

how does Event dispatcher even relate to replication.

[heavy hound]

Did you get to see the reddit post?

[dark parcel]

the listening and broadcast happend local to the client.

Damn, i hate reddit

the first comment already speaking none sense

[heavy hound]

It works perfectly fine implementing it every other way — interfaces, replication calls and all.

[dark parcel]

You need to understand that each machine are running their own instance of the game, running their own world.
Each machine would need to bind to the dispatcher at the time the function is called.

If your client doesn't get the broadcast when they run the function (from multicast or w/e), then that specific machine never bind to the event.

Show the binding?

[heavy hound]

It's on the screenshot

[dark parcel]

https://www.canva.com/design/DAGzsnmJIZg/4r323YiIZflQd90j_rBmbg/view?utm_content=DAGzsnmJIZg&utm_campaign=designshare&utm_medium=link2&utm_source=uniquelinks&utlId=h4e76855f95

this is the only screen shoot, it's not there.

oh there's 2 pages

[heavy hound]

correct

[dark parcel]

have you debug if the clients execute the binding?

wait this code is confusing

[heavy hound]

The binding seems to work locally. If I press 'F' on client or the server, the door rotates locally but does not replicate.

I literally spent $40 on a consultant and he kept yapping about unreal networking, without addressing the issue lmao.

[dark parcel]

if the door rotation needs to be in sync, then you can throw away your Multicast for a start.

aka if everyone needs to see the same angle, then multicast is not the way

[heavy hound]

Lets just replace the door rotation logic, with a simple print statement.

I'm just testing stuff with Event Dispatchers and Multiplayer. Door was just a way of experimenting.

[dark parcel]

No issue with event dispatchers at all on my end

[heavy hound]

I feel like Binding might be the issue?

[lyric heart]

so what does the details look like if you search for replicates on the door ?

[heavy hound]

'Replicates' set to true

[lyric heart]

does the print string show on all ?

[heavy hound]

Like I said, it works with interfaces and variable notifies, just not with event dispatchers :(

[dark parcel]

well its not like nothing actually get replicated on your end. You are just telling every client to run X function which rotate the door by 10 degree

[heavy hound]

Which one? The one on the screenshot? yes. It replicates. No issues with the multicast

[dark parcel]

what "replicates"

[lyric heart]

the only one in the images ya

[heavy hound]

correct

[dark parcel]

nothing really replicate?

There's no replication at all on your end.

you are just doing Remote procedural call

what's actually being replicated?

[heavy hound]

I just want the door to rotate on server and client

[lyric heart]

multiplayer is a whole beast of a thing, but so far everything is good, i just got this weird collision issue but it stays in sync

[lyric heart]

makes sense

[dark parcel]

then you can replicate the state of the door.
Use float, OnRep -> Interpolate to the value from the server.

if client is allowed to change the rotation, then do a server rpc where the server set the rotation of the door.

If server, then just set the float right away.

[heavy hound]

Valid point. I know it will work this way. I have tried it and it works. But I wanna do it with Event Dispatchers now.

[dark parcel]

that's not stateful.

it's an event

any dropped RPC and you get different angles between players.

also late joiners guaranteed to see different angle, if the function have run before they join.

[heavy hound]

Thats totally fine. Like I said, I'm just experimenting

I don't mind if it syncs or not syncs. I just wish to undertsand, why this setup is not working

Lets just forget about the door rotation altogether and replace that locgic with a print statement. I would be happy if the print gets replicated.

[dark parcel]

you are binding to Player 0 Character delegate only

the entire thing is pretty confusing

[heavy hound]

This setup works?

[dark parcel]

not how I would do it at all

but yeah "works"

[heavy hound]

What does this part do tho?

[dark parcel]

When the character spawn , it gets all the door in the world and pass it self to be binded.
Gonna scrap all of this

[lyric heart]

why would my gamepad not work in multiplayer on a packaged build ?

it works fine in standalone

[heavy hound]

Cool.
Why wasnt it working in my setup?

[dark parcel]

#multiplayer message

[heavy hound]

But Player 0 on both client and server would mean the local characters right?

Thank you so much!

[obsidian ermine]

Use RepNotify States. Enum (Closed, Opened)
Let the Onrep_DoorState function handle the transitions.

[heavy hound]

Did you even read the 'PS' section of that reddit post in 'BOLD' ?

Anyways, I figured out — why it was not working.

[obsidian ermine]

Get Player Pawn (0) is always the first player to join in a MP setup.
Cannot use any node that requires index for MP.

[heavy hound]

get player pawn 0 is local.

It referes to the local character in both server/client

It's not the first player to join in MP setup.

[obsidian ermine]

In multiplayer on the server side 0 -> first player, 1 -> second player, 2 -> third player etc

Multicast ( Executes on all ) Also executes on the server.
So the server is executing on the first player.

[verbal ice]

On a listen server the first player is always going to be the local player

On a dedicated server 0 is just the first player to connect

[thin stratus]

@verbal ice @obsidian ermine @heavy hound there is a pinned post by me from where I looked into that. Just in case you wanna confirm stuff.

[verbal ice]

So pretty much always guaranteed to return a local player if there are any first right

[craggy hazel]

Can anyone help? I've tried literally ALL day and cannot get the Steam Overlay to open during Standalone.

I've absolutely exhausted all options

[obsidian ermine]

If Autonomous Proxy index 0 is local.
If Authority proxy index 0 is server player 1

[verbal ice]

Yeah I know that heh

Literally what I said above

[obsidian ermine]

just noting the proxies

I see a lot of people using get player controller (0) in server-side logic.

Drives me nuts

[lyric heart]

did you try in a packaged build ?

mine doesn't show on standalone, but in the packaged build it comes up

[craggy hazel]

when i run my game from Steam (It's obv not out yet but is set up in steam) I can open the overlay

I'm trying to make steam achievements, and in every single tutorial they open steam overlay to confirm it's working. So I don't want to start making all the steam achievements if I can't even do the first step in their videos which is opening the steam Overlay to confirm it's connected properly

[lyric heart]

i'm not understanding, you can open the overlay but you can't ?

[craggy hazel]

Sorry - when in standalone, I cannot open steam overlay.

But, when I'm inside steam and click the green PLAY button, I can open the overlay when doing that

[lyric heart]

the green play button is the downloaded from your store page right ? not your updated code that your testing

ya i couldn't get it to come up on standalone either

i had to run a packaged build

[exotic wasp]

uobjects not being able to have replicated subobjects is so annoying

[fossil spoke]

They probably can, they might need manual setup thats all.

Obviously the owner UObject would still need to be repped through an Actor.

[exotic wasp]

should have worded it better, its possible but just really annoying

[fossil spoke]

Right

[craggy hazel]

I finally got Steam Overlay to work in Unreal, but after a few hours, when bringing up the Steam OVerlay the 'achievements' button is greyed, inactive, and unable to be clicked. I published the achievements to steam about an hour ago!

[jovial ravine]

I don't think achievements work in the editor. You might have to package.

[meager spade]

Steam doesn't work in editor properly at all

You have to always yest standalone

Test

[limpid needle]

Hello!! I’m working on a multiplayer MR setup in Unreal. I’m apwning grab able actor from server and saving the floor transform in the GameState so when clients join, the spawned actor align with the server’s floor, keeping the passthrough world consistent. The issue I am facing is with grabbing. Right now, when the server grabs an actor, it replicates properly. But when a client tries to grab, the actor either doesn’t stay in their hand or starts drifting away. My grab flow is: 1. client input → server RPC (validate + SetOwner to client PC) → client RPC. The actor has replication and replicate movement enabled.
p.s sorry for spaming 3 channels as its VR/MR and multiplayer issue

[lyric heart]

I'm trying to make a custom character for the player on multiplayer, but its giving me a bunch of issues

i'm still not understand replication and stuff

i tried to place the actor in the world, didn't work

i try spawning on begin play didn't work, i also tried rpc same thing not working

i'm trying to set view target with blend

to the new camera actor for each player

nothing seems to work, pain in the ass

everything i try it only work on server

[dark parcel]

@lyric heart it's necessary to understand server to client communication.

you can start from the very basic first.

like spawning a replicated sphere where server set the color. And that changes replicate to everyone.

[lyric heart]

i can spawn things i have done that

and changed the material

with rpc

[dark parcel]

with what rpc?

[lyric heart]

server, and multicast

[dark parcel]

multicast = doing it wrong.

[lyric heart]

well actually the multicast is for the montages

and i also did it for health of enemy

[dark parcel]

thought we are just talking about a cube and it's color.

so how do you change the color?

[dark parcel]

Yeah that's wrong too.

there shouldn't even be RPC to set health.

server simply set replicated variable.

and the new value will eventually be send to client.

Personally I just look at the compedium dozens of times, practice, fail. Once it click, then replication is easy and in multiplayer it's actually the easy part.

the other challanges involving mp can be explonentially harder.

[lyric heart]

so i did repnotify and it seems to work

instead of the multicast

[dark parcel]

yeah but you gotta use them where they are needed.

I don't know what works or not on your end.

RPC is for a one time event.

Replicated variables is for state.

[lyric heart]

ok well i don't want to replicate it, i want each one to have a seperate version

i want them each to have a different spawned actor that they can access

and i can only get it working on the server idk why it's a hassle lol

its for a custom camera because the regular cam is bs imo

[lyric heart]

how else do you replicate montages ?

oh i see because they are not needed state

just one off

based on what i'm seeing i don't want replicates at all

i want this to be on each one seperately

[dark parcel]

then just spawn locally

make sure bReplicate is set to false

[lyric heart]

yes i did that, and i'm setting view target but it's only setting the target on the server

[dark parcel]

and ensure that the code that spawn is local to the machine you want to spawn it in.

[lyric heart]

yes i just did that with is locally controlled

[dark parcel]

e.g Input (inpuit is local) Pressed -> Spawn my ball.

[lyric heart]

yes the code runs to spawn, but it doesn't posses

it's probably the controller ?

i'm using get controller

[dark parcel]

can't say much unless I see some codes.

but I am not even sure what your goal / what the problem is.

if you want to spawn a local actor, then there's no need to think about it multiplayer at all.

[lyric heart]

this only works on the server for some reason ?

but it runs twice

[dark parcel]

don't know what runs prior to this nodes

[lyric heart]

why would that even matter ? but nothing

[dark parcel]

?

[lyric heart]

it's literally on begin play

[dark parcel]

I wouldn't know that

[lyric heart]

ok so nothing runs before it

some stuff after it

[dark parcel]

the important part what executes the nodes. Wether it's run from RPC, or some events like begin play.

those matters ofc.

[haughty ingot]

Maybe don’t respond rudely and abrasively to someone trying to help.

[lyric heart]

right, of course

[dark parcel]

Maybe do a print string and see if the client execute the code

[lyric heart]

ok maybe it's running twice on the server ?

[dark parcel]

Begin play is normally the wrong place to do stuff. Mainly because character /pawn is not possessed yet

it takes time for the client to be given the pawn by the server.

So if your code runs in a pawn / charactert object.

[lyric heart]

yea they both print hello at the end

[dark parcel]

IsLocally controlled most likely return false.

if done at begin play for client.

[lyric heart]

well it works for both

it's print string fine

it works fine if i don't load net stuff

[lyric heart]

thanks for the help btw, this is a pain in the ass i've tried a bunch of stuff lol it's probably something stupid i just don't undersand

[dark parcel]

Took me maybe 2 months to actually understand how variables replicate and how RPC work.

i'm always at the bottom of the class.

you just gotta read the compedium, experiment, fail, then try again, until it clicks.

Is the pawn dynamically spawned or placed in the level?

[lyric heart]

spawned

but i tried both ways

[dark parcel]

I figured it out it seems

you are fighting with something

possibly with possession

Try adding delay just for sanity check, it work for me.

Add delay before you spawn your camera and setting the view target

I believe this come down to begin play being too early for this stuff..

[lyric heart]

i see

so should i do it on possess or something ?

[lyric heart]

yes this worked, thank you

[dark parcel]

AcknowledgePossession would be my go to

C++ though but you can do it anyway

OnPossess only get called by the server

AcknowledgePossession is what gets called on client and at this point the pawn is already possessed in the client.

[dark parcel]

so that's just a hack, because if the client have high ping, then that delay is no longer a bandaid.

use the right event for the right job.

[lyric heart]

ao i need c++ ? or there is bp version of this ?

[dark parcel]

AcknowledgePossession isn't exposed to bp

[lyric heart]

fk

[dark parcel]

you can do other ways, but it's more side tracking

Lik OnPossess then run client RPC

actually Im not even sure if that's guaranteed.

Just make a BlueprintImplementableEvent function and call it on AcknowledgePossession.

[lyric heart]

i'm not that good with c++, but this is where i want to call it, and idk how to make a blueprintimplementableevent

void APlayerController::AcknowledgePossession(APawn* P)
{
    if (Cast<ULocalPlayer>(Player) != NULL)
    {
        AcknowledgedPawn = P;
        if (P != NULL)
        {
            P->RecalculateBaseEyeHeight();
        }
        ServerAcknowledgePossession(P);
    }
}

so this is where i would want to call the new function ?

[dark parcel]

@lyric heart You will need to create your custom controller class.

don't touch engine's code

[lyric heart]

oh i was going to change it lol

[lyric heart]

ok np

[dark parcel]

@lyric heart are you using rider?

[lyric heart]

no visual studio, hopefully this works i have live coding on for some reason

fk i fked it up

i forgot to disable live coding

[harsh cloak]

Is the project not compiling now?

[lyric heart]

it wouldn't build

i have a backup i'm trying to get to

[harsh cloak]

Delete intermediate and binaries folder then try re compiling

If you changed engine code that may also be an issue

I’ve also punked myself with live coding so I do feel for you

[lyric heart]

i forgot to disable it

[harsh cloak]

Happens, shouldn’t really be an issue but you never know

[dark parcel]

what does it say? Close the editor when building.

[lyric heart]

i got it just used a backup instead of messing with it

[lyric heart]

Super::AcknowledgePossession(P);
OnClientPossession(P);

it's firing off now atleast

but it's not setting the view target with blend

[dark parcel]

What's OnClientPossession?

post the entire function

[lyric heart]

it is running

[dark parcel]

might still be fighting with something, btw might want to do IsLocallyController check there.

[lyric heart]

i put a delay just before view target with blend and it works

[lyric heart]

delay until next tick solved it

although delay is not usually a good answer

i think delay until next tick is ok to use ?

[lyric heart]

thanks for the help, this stuff is all new to me

[lyric heart]

https://streamable.com/dthg8z

[dark parcel]

Yeah, it's needed in some casses

[lyric heart]

if i have to delay until next tick i feel like this is too much of a hack, since it seems to be reliable

but say guessing a time for it to delay i can see is an issue

[dark parcel]

That delay is on tick probably just address the actor not fully spawn yet.

delay is a hack when it's used for multiplayer.

but in your context, it's not an issue since the camera is spawn locally

[lyric heart]

ya it doesn't need any network stuff

[high lotus]

it looks like you are running the grab in a way that you are messing up the movement of the world when you move the object which is moving where you are holding the object on the server
you might want to have the player be able to place the object - not one on the server, and then figure out the world offset transform

[lyric heart]

this multiplayer stuff is pretty difficult lol

[exotic ledge]

what do you think about this guys?

[quasi tide]

Uhhh - unless you need specific local spawned actors...why?

UE automatically replicates any spawned actors that are marked as replicated

[exotic ledge]

i try to tell the same thing, this is a bad approach and will create duplicates

The actors spawns with RemoteRole = None

[exotic wasp]

Cursed

Just make the actor replicated

[exotic wasp]

I'm not sure a delay is ever the right thing to do

Usually you just need to bind to the right callback

Or create your own

[exotic ledge]

Imagine using a plugin with this code 😂 and more...

[exotic wasp]

I would probably not use said plugin

[lyric heart]

i think delay until next tick is fine though ? its a consistent thing besides delaying for a time

i would like the best way if possible, but this seems to work every time

[tropic moat]

When I call Auth->Login it returns TOnlineAsyncOpHandle, I'd like to store it so I can call Cancel on it if necessary. The problem is that TOnlineAsyncOpHandle doesn't have any constructor I can use to make a variable. What's the intended way to cancel async online operations?

[toxic cobalt]

need emergency help: CAN PROVIDE SCREENSHOTS OR ELABORATE IF NECESSARY

in my game, there is a trace thats runs the interaction. it should be that when a player interacts wiuth another, the focused one is moved back a tiny bit. this partially works, but i find that the focused player is often scrambled. when one actor interacts with another, it might work OR it might move themself or even a completely random player. please help, i need to get this done asap or else i will be a big troublea

images of the code

please help somebody

[nova wasp]

do not use GetPlayerCharacter(0) on the authority to obtain a player, you should always use a specific player from what is actually doing something on the server

I have no way of telling what you changed after someone else helped you

Or which of these functions run on which machines (client/ server/ sim proxy etc)

[heavy hound]

Why is that? GetPlayerCharacter(0) referes to the local player in both client/server instances right?

[short arrow]

No, it refers to the first controller found on whatever instance called it. So for a dedicated server (and very rarely a listen server) it'll be whichever player connected to the game first. It would be the same situation for clients if other controllers actually existed for them besides their own

[nova wasp]

#multiplayer message

you are assuming you only care about the local player in this case

I do not know that

[heavy hound]

So binding a dispatcher with GetPlayerPawn(0) wont replicate?

[nova wasp]

what is a dispatcher?

[heavy hound]

Event Dispatchers

[nova wasp]

what is it doing? who is calling it? what is passed into it?

[heavy hound]

I'll dm?

[nova wasp]

RPCs are not "dispatchers" afaik anyways, they are regular events (if an event dispatcher can be replicated I honestly do not know)

no thanks

[nova wasp]

did you read the message I linked?

when this gets the player controller by index it will get the first player controller in the list of player controllers in that local game instance, it does NOT use the local actor here you have to figure out which player is actually related to this actor

UGameplayStatics::GetPlayerController(Index)
Checks the LocalPlayers Array of the GameInstance first
Then checks the PlayerState Array of the GameStateBase
Then uses the UWorld PlayerControllerList (iterator)**

[heavy hound]

Is there a more dumb downed version of that?

[nova wasp]

there is a global list of player controllers on the authority for each client

using the first one for no reason with 0 context is rarely a good idea

[heavy hound]

Oh, this makes sense

[nova wasp]

it only really makes sense for local multiplayer couch-co-op games or if there is only one controller (aka you are a client connected to a server with 1 local player)

so in this case the server will just use... whatever the first player controller is each time which is almost certainly not intended

[heavy hound]

Thanks!

[nova wasp]

https://wizardcell.com/unreal/multiplayer-tips-and-tricks/#2-beware-of-getplayerxxx0-static-functions

this gives examples and what to use instead

Why GetFirstLocalPlayerController is not exposed to BP is a mystery lol

it is useful because it iterates the list of player controllers to find the first one that is local (AKA if the listen server is a local player it will get that, and clients will get their own controller)

on dedicated servers though there is no local player

[heavy hound]

It's super hard to piece all of this together, like this 'player controller' for example. Do you know any paid consultant for Multiplayer, who can help with the best practises?

[nova wasp]

you have a giant list of links to read for best practices

this stuff is insanely complicated in practice depending on the game I guess

[heavy hound]

What about a game like cuff-bust? Do I need to learn networkign fundamentals and should be capable of understanding the UE Source code to work on something like that?

That's too much

[nova wasp]

I don't know anything about how cuff-bust works

[heavy hound]

Lethal company, or any other friend slop genre

[nova wasp]

you don't need to read the entire source of unreal but it's really difficult imo to make an actually complex/high-scale networked game with bp because it's just insanely limited and you can't tweak much

I think the fact it is a co-op game is a big point in your favor because you can for example just trust the client and not worry about client-prediction->authentication flows

[heavy hound]

Can I please DM, I just wanna send a reddit thread about Unreal Multiplayer, which I feel is a hoax and seems extremely discouraging. I just wanna confirm if thats true?

[nova wasp]

sure, whatever

[pseudo wagon]

Send it here. I am curious also.

[heavy hound]

https://www.reddit.com/r/unrealengine/comments/102e6id/is_making_multiplayer_games_easier_in_unreal_or/

Top comments first reply

[chrome bay]

load of bullshit

1. The term "networking stack" means nothing, no idea what they're on about.
2. Fortnite is made by Epic, they use the same tools/systems we do.
3. Gaps in replication updates are expected, it's by-design and not a bug.

In summary: skill issue

The only thing that is perhaps worth pointing out, is that Blueprint has only a bare-minimum of multiplayer tooling/support. If you want real power, as with everything else, you do things in C++. Nothing really surprising about that though.

[lost inlet]

Isn't it great when people out of their depth blatantly lie about things they don't understand

Not like it's a common issue on Reddit (or YouTube)

[latent heart]

We actually have a big problem with things not replicating correctly. It's weird. You run away from an area (far away, out of relevancy range) and back again and items that should spawn in that area no longer do. They exist on the server, but not on the client. Setting them to always relevant fixes it. We haven't really looked that much into it yet.

[toxic cobalt]

Oh

[limpid needle]

umm that issue somehow fixed as i was replicating grab component's transform on tick i removed that, now component being drifting away is fixed, but client can't remove the held component, i updated the code to setting the variable through server rpc and on releasing calling server RPC event to release and reseting the held component variable

[crisp shard]

https://x.com/theredpix/status/1972436890495189081

curious if anyone has a take on this? if test is legitmate, which i assume it is, then how would you accomodate / manage to make this be faster than it is now? and what would be some tips to do that ? or just any thoughts on the matter

TheRedPixel (@theredpix)

#UnrealEngine This is some of the most relevant performance-related findings about #Performance Regression: CharacterMovementComponent performance has regressed over 2x slower from 5.0. The following captures are from when a Character is moving. 5.6 stayed most of the time at

X · Sep 28, 2025, 11:02 PM

[chrome bay]

Wihout actually profiling it, impossible to say

Run an insights capture, see what's slow, try to make it faster or use alternatives

[crisp shard]

in general, does the post seem accurate to you?

and if so, what are some methods people use to optimize the base CMC ?

also, what alternatives exist ? i know of GMC, but i'd probably guess that'd be even slwo as a base start

[glacial seal]

Hi all, I have equipment that change animation layer upon weapon equip. It work on server side but fail on client.

When my client player equip the weapon, the animation layer did not change but player on server side is able to see the animation layer switch to pistol.

May I know how I can debug this? My pistol is spawn on both client and server.

[lyric heart]

i'm trying to fix this ui, i don't understand why it's not replicating ?

i've tried a bunch of stuff and it's still fkd

[glacial seal]

@nocturne quail thanks a lot it is working now 😄 Instead of link anim layer in fragment itself, i just link the layer in my equipment component, which I implement server and multicast version of the function.

thanks a lot for your guidance!

[meager spade]

those screenshots wtfd

.6? i see .06 and .17

[twin vessel]

What is the easiest way to manually serialize an array of TInstancedStruct? I cannot call NetSerialize on the FInstancedStruct since it is a private member.

I've got this, but i am still far from being able to test if it actually works.

bool FXEquipU_ActionResultPredictedVar::SerializeNetworkData_Internal(TArray<TInstancedStruct<FXEquipU_ActionResult>>& Value, FArchive& Ar, UPackageMap* PackageMap, bool& bOutSuccess)
{
    int32 Size = Value.Num();
    Ar << Size;

    if (Ar.IsLoading())
    {
        Value.Reserve(Size);
    }

    for (int32 i = 0; i < Size; ++i)
    {
        FInstancedStruct Struct;

        if (Ar.IsSaving())
        {
            Struct.InitializeAs(Value[i].GetScriptStruct(), Value[i].GetMemory());
        }
        
        if (!Struct.NetSerialize(Ar, PackageMap, bOutSuccess))
        {
            return false;
        }

        if (Ar.IsLoading())
        {
            TInstancedStruct<FXEquipU_ActionResult> Deserialized;
            Deserialized.InitializeAsScriptStruct(Struct.GetScriptStruct(), Struct.GetMemory());
            Value[i] = Deserialized;
        }
    }
    
    return true;
}

[high lotus]

do you unparent the object stuck on the hand on server and client?

[crisp shard]

lol i did see that, had to be a typo

[lyric heart]

the timing of things that load is a pain in the ass

i need to delay to get what i want and this is shitty

like if i delay 5 seconds, then what if it takes 10 seconds ?

for some reason i can't set the damn widgets to have there names without a delay

in game i can switch names np

it's the initial load, it doesn't want to change it

[meager spade]

use event driven

or tick or w/e

[lyric heart]

i tried event driven

the timing is all fucked

a delay works

multiplayer is frustrating af

i tried a bunch of shit and it just doesn't work without a delay

i'll have to check a tut

[meager spade]

its not frustrating

its understanding, building systems to handle edge cases, etc

[late surge]

Don't ever try to use delay or hour-glass wait for next tick. Use callbacks.

[lyric heart]

easy to say ig, but for me this is just frustrating, i've tried so much and nothing is working

the only thing that works is a delay

so it's something with the timing

but i can't get it to work right lol

[limpid needle]

from server i even tried to pass held component variable in RPC event

[lyric heart]

i see mulltiplayer requires mostly c++

because the timing in bp is just fkd

and i think c++ has events that can solve it

[thin stratus]

The timing in BPs and in C++ is the same. The only difference is that some of the native properties have OnReps that aren't available in Blueprints.

[lyric heart]

ya the onrep_playerstate is what i'm looking for

so now i need to create a new character c++ class

reparent (which i;ve never tried)

and alter the code lol

it's such a pain in the ass

[thin stratus]

I mean, yeah. There is a reason behind peeps saying that Blueprints have their limits and multiplayer is usually in need of C++.

There are only two options to this: Believing it or finding out the hard way.

[grizzled stirrup]

Is PlayerState->GetUniqueId()the best way to track a unique player that may leave and join a lobby later to see if it's the same person?

[verbal ice]

Consider it somewhat equivalent to CMC by default

Although the way it's written makes it a lot more readable, and you can tweak a lot of settings to improve performance