multiplayer

[chrome bay]

tbh it would be nice if they left the distance culling up to the node instead of digging it in deep like that

[solar stirrup]

Dunno if I should pass that in instead, because it just keeps adding parameters to the paths now

Yeah true

My solution is just to have add a set

Nodes can add actors to it like they would add their lists

[rocky kestrel]

I have MMO game (survival and in development) I have built server and I can connect in open 'ip' and it works. How could I build server browser and for example name for server? should server create session when opened or what?

[latent heart]

I'd look into steam integration.

Or EOS.

[rocky kestrel]

Okay ty!

[solar stirrup]

Params.OutGatheredReplicationLists.AddReplicationActorList(ReplicationActorList);
Params.OutSkipNetCullDistanceActors.Append(SkipDistanceCheckActors);

time to put this to the test

[solar stirrup]

Works fine

[umbral dragon]

Is there anything slightly equivalent to EndPlay for ActorComponent that runs on client?

[low helm]

Try to bind an event to ondestroyed

[umbral dragon]

Thanks 👍

[umbral dragon]

OnDestroyed also seems to be server only if I didn't make a mistake 😢

[solar stirrup]

override UnregisterComponent()

it'll be called when the component is being destroyed

iirc

[chrome bay]

Components have their own EndPlay too

And yeah Unregister is also useful

[fathom aspen]

Are you sure it's overridable?

[umbral dragon]

Thanks for suggestions. UnregisterComponent is not virtual though

and called by DestroyComponent which is the same function that calls EndPlay so I think will only run on the server also

[shut compass]

How do you transfer session from browser -> Unreal Session?

[solar stirrup]

Wooops. mistook it for something in our codebase

my bad

oh yeah they do have EndPlay()

[fathom aspen]

Haha yeah no worries. I was looking at it like an hour ago wondering why it's not virtual xD

[umbral dragon]

they do have EndPlay but at least I didn't hit any breakpoint on client. Maybe I am missing a super somewhere

[chrome bay]

Ah no, it's OnUnregister and OnRegister

The component needs to be replicated and created at runtime btw if you want to destroy it in a network game

[umbral dragon]

Thanks! Owning actor was not replicated 😳 Now I feel dumb!

[vast forum]

Hey @latent heart hope it's OK to ping you here with my solution. I think maybe you would be curios?

The issue is that actors have a special "Net Relevancy" logic, that is evaluated during the start of a PIE session.

[latent heart]

Ah ha.

[vast forum]

The logic is... questionable, but it essentially says that actors with a collidable root component are relevant.

So my actor was AActor -> USceneComponent ->SphereStaticMesh

The "bug" went away when I removed the intermediary scene component.

[latent heart]

Yaeh collision components should always be the root.

Unreal tends to go wrong when it isn't.

[vast forum]

Well in this case the bug persists if SphereStaticMesh has collision turned off

So you really absolutely need an active collision on PIE start if you want the actor to have a replicated bIsHidden state

[chrome bay]

Well it just wouldn't work any other way. The root component determines the transform of the actor, so wherever it goes, the rest follows - collision be damned.

Note that NetRelevancy logic is evaluated continuously btw, every time the actor is viable for replication

[latent heart]

But it's perfectly valid to have a collision component attached to a root component - in theory

[vast forum]

Yes

[chrome bay]

Yeah for sure

[latent heart]

UE just doens't like it 😛

[vast forum]

I feel like it's still a bug though

[chrome bay]

But if you move the root somewhere, it'll sweep only that component

[latent heart]

That being one of the issues!

[vast forum]

So, just so I learn something from this: If net relevancy is evaluated continuously, what are the conditions that cause it to evaluate incorrectly, but only in the first few seconds of PIE?

If a collidable root component is a requirement, why does a non-nominal delay allow the property on-rep to succede?

[chrome bay]

None really, the server calls "IsNetRelevantFor" for each connection

If it returns false for whatever reason, it won't replicate to that connection

For the record a collideable root component is not required for the default network relevancy

But you do need a scene component at least so that the actor has a valid transform

Otherwise it has no way of knowing how to distance cull

[latent heart]

He had one.

[vast forum]

Except that it is.

In some conditions.

My guess is that bAlwaysRelevant gets enabled at some point, by UE4.

So at start of PIE we miss that early-out, and it only comes online later.

[chrome bay]

It doesn't have to collide - the actor just needs a valid root component. If it doesn't have one, then replication will not function unless the actor is marked as always relevant.

For example, PlayerStates, Controllers and GameState

[vast forum]

No, this is incorrect.

[chrome bay]

They have no root component but are marked as always relevant

[vast forum]

I could cause the replication bug to occur by simply switching the root StaticMesh to NoCollision

i.e., line 318 in the net relevancy evaluation

This was consistent across PIE, out-of-editor testing, packaged build, and testing PIE single-process/dual process.

[chrome bay]

That only takes effect if the actor is both hidden AND has no collision, so that makes sense

[vast forum]

My actor began life visible, and was marked as hidden on the server, after a small delay.

In this scenario, the actor remained visible on the client, unless I made the root collidable, or bumped the delay up.

[chrome bay]

Ah right, in which case then the actor would shortly after be destroyed client-side

[vast forum]

Hmm?

Actor was never destroyed on the client.

[chrome bay]

Was it spawned at runtime or placed in the level?

[vast forum]

Placed in the level.

[chrome bay]

That's why then

[vast forum]

It's not torn off or anything.

[chrome bay]

So what's happening is the actor is no longer relevant because it's hidden and has no collision, so the client will receive no updates for it

And shortly afterwards, the channel for that actor will be closed

If it was spawned at runtime, that will destroy it

[vast forum]

But the actor wasn't hidden ?

It starts visible, and remains visible.

[chrome bay]

You said you set it to hidden on the Server shortly after?

[vast forum]

Yes

[chrome bay]

Exactly

So IsNetRelevantFor will return false - therefore no more property updates will be sent

[vast forum]

Ah, so the race condition is that the server sets it hidden, and then before it has a chance to replicate, it evaluates itself as being non-relevant.

Fascinating.

Do you have any insight into why the IsNetRelevantFor actually does start working again, after a number of seconds?

I guess just some other condition is making it true

[chrome bay]

Yeah, once it's no longer relevant, no more property updates are sent. After a short while, the channel will then be closed. It doesn't close immediately because if an actor is frequently becoming relevant and then not, it can spam channels being opened/closed

And opening a channel will resend all properties of the actor, it's treated like a new actor

Similar to waking from dormancy, the only difference being dormancy doesn't destroy the channel nor the actor

[vast forum]

If it was strictly necessary to code this feature server-only (it's not), the solution would be to force the actor to be relevant by setting bAlwaysRelevant, I guess?

Either in-code, or in the asset.

[chrome bay]

Or override + change IsNetRelevantFor so that it doesn't factor the actor being hidden/collision

[vast forum]

Ah good point.

[chrome bay]

It is odd they chose to make that the default behaviour tbh

[vast forum]

Yep

Like I said, I maintain that it's essentially a bug

Or at least ill-defined behavior.

You should in theory be able to change a replicated property whenever you please.

The fact it has hard-coded logic means that this "gotcha" exists.

[chrome bay]

It's certainly a silly logic issue, I wonder if this has been added at a later date or is a relic from UT/Gears days

[latent heart]

Isn't there like an AlwaysRelevant flag somewhere>

[chrome bay]

Yeah but you lose distance-based culling then, which you may want

[vast forum]

No clue. I spent most of my time doubting my own code/surrounding system.

I knew the solution was to just hide/show on both client and server, but I was very curios about the problem, since I feared it would uncover some greater issue in the code.

In the end we did chase it down into the default AActor::IsNetRelevantFor, and could implement simple fix 😁

[chrome bay]

Yeah, in this case I'd probably override that for this specific actor

[vast forum]

It's a generic system

[chrome bay]

But it is a questionable default implementation for sure

[vast forum]

It makes me wonder, do companies ever write their own base class system?

i.e., AActor -> ASirLichActor -> AActualUsableThing

For the purpose of having a controllable layer, in case project-wide implementations need to change?

Because this issue could be fixed in ASirLichActor, assuming everything was inheriting from that.

[chrome bay]

It looks like this impl has been there since 4.0 so I guess it must be a relic

[latent heart]

Just set bAlwaysRelevant!

[chrome bay]

That's not a solution if you want distance culling though

[latent heart]

It is a solution if you want to have invisible objects with no collision replicate

[chrome bay]

In answer to the Q though, probably not - I'd just modify the engine like a turbo nerd

[latent heart]

Just set always relevant when it's made invisible

[vast forum]

Once again, I will reiterate that for my needs, it's perfectly acceptable to set visibility across both client and server.

I think the old optimization was already a bit too clever 🙂

Simpler, more robust code, alongside a bug fix.

But it is very useful to have theoretical solutions. I think I would tend towards toggling bAlwaysRelevant to true before setting visibility, and then I guess setting it again to false.

Although I'm not sure how you would detect that the replication packet had been forwarded

[chrome bay]

You can't unfortunately, or at least the engine doesn't expose a method to know whether the client has acked the most recent property state

That information is known though, so would be a nice thing to have available

[halcyon totem]

what ports do I need to open to host a dedicated server on unreal???

[quasi tide]

I think default port that UE uses is 7777

[halcyon totem]

so it seems like its not like the 1990s where you could just host a server from your PC?

seems like they are blocking ports, has anyone got dedicated servers to work with a home pc?

[quasi tide]

UE ain't blocking ports. Just set up your home network to allow it.

[halcyon totem]

I did and it says closed still

what a nightmare, looks like I wont be able to set up my own dedicated network

[willow prism]

Hello, I have an actor that should only be relevant for each player, so it is not replicated, it is invoked with a button, when the player invokes it I have a print to see what I invoke. I don't know why when the server invokes it it looks like this. Any idea why this happens?

[oak prawn]

Is there a multiplayer lobbying guide?

[quasi tide]

Has nothing to do with Unreal. This is purely your network.

[halcyon totem]

what other options do us poor people have to run dedicated servers? Gone are the days when you could just open up ports and run a server

[willow prism]

it's like the server started it but at the same time it doesn't

If I run it only from one player with play a listen server , it works correctly, the problem is when running it with more than 1

[static flare]

If my actor has a value that increments every tick that I want to replicate, should I actually call an RPC on every increment (even though they happen more frequently than server can handle), or is there a sort of "server tick"-function or some sort of "prepare packet"-function that I can utilize to send the aggregated result of the ticking? Or would I need to implement it myself and have a timer that calls the RPC every ServerHz/1 second, where I'd get the Server hertz when joining?

[shadow aurora]

Just as a heads up, I did end up passing in the location of the view target instead of SrcLocation and that seems to have fixed the issue for now!

[fathom aspen]

Nice, good job!

[halcyon totem]

ok so running a dedicated server on my pc wont work because of a port forrwarding nightmare, what other options do I have? If I was to rent a server, what subsystem can I use to have android and PC connect?

[dark edge]

We test with dedicated server running on a trash laptop

I'd recommend just renting a cloud server to figure it out

[fallow shadow]

Ok im defo facing rubberbanding

Idk how to fix it

its only before the character reaches max speed

Once it reaches max speed it stops

[halcyon totem]

@dark edge how do you do this? i wish I could but my ISP is blocking ports

[hollow stirrup]

Does anyone know if the default WebSocket server implementation supports WSS?

Looking at this it doesn't seem like it does Engine/Plugins/Experimental/WebSocketNetworking/Source/WebSocketNetworking/Private/WebSocketServer.cpp

Seems like a bit of an oversight from Epic

[dark edge]

Rent a $10 DigitalOcean server then

[outer rose]

Hi guys,
Anyone knows why in the "Lyra sample project" their character movement component replicates acceleration with a rpc to simulated actors?

{
    Super::GetLifetimeReplicatedProps(OutLifetimeProps);

    DOREPLIFETIME_CONDITION(ThisClass, ReplicatedAcceleration, COND_SimulatedOnly);
    DOREPLIFETIME(ThisClass, MyTeamID)
}

void ULyraCharacterMovementComponent::SimulateMovement(float DeltaTime)
{
    if (bHasReplicatedAcceleration)
    {
        // Preserve our replicated acceleration
        const FVector OriginalAcceleration = Acceleration;
        Super::SimulateMovement(DeltaTime);
        Acceleration = OriginalAcceleration;
    }
    else
    {
        Super::SimulateMovement(DeltaTime);
    }
}```
the rest of the relevant code is in this gist: https://gist.github.com/RJrodrigo/ba5e2e33da3c4614451dc4eb6123ad14

[toxic lion]

FYI as I learned not that long ago, you're technically breaking the Unreal TOS by sharing 'large' amounts of code

[outer rose]

this is the lyra source code

[toxic lion]

it does specifically say 'Engine Code' in their TOS so might be good then

[halcyon totem]

@dark edge thanks for the digital ocean recommendation, right now im using the advanced sessions for servers, will that method work for pc and android players to connect to same sevrer?

@dark edge how come there is no windows options there? My server is packed as an exe, how can I use it there?

[icy marlin]

Hello guys! Can anyone give me a hand with a problem I'm having when replicating a rotation? I can show in a voice channel! Thanks! 🙂

[dark edge]

Yeah idk if they do windows boxes. WHy are you doing windows dedicated server?

[pure brook]

Hi, can someone tell me where can i find a person who could help me convert some Single player BP logic to Multiplayer?

[dark edge]

#freelance-jobs #hire-a-freelancer

[vestal cobalt]

Is there any known bugs in UE5 using the New Editor Window (PIE) and Number Of Players : 4 ?

when i run this Server and Client 1 works as they should but Client 2 and Client 3 is not!

what i mean by "Not working" is that i have a floor of lava rising up each tick! this is updated and you can see it on Server and Client 1 but not on Client 2 and Client 3 :S

PS: Using Blueprints

[dark edge]

Show your lava floor blueprint

[vestal cobalt]

Construction Script

Event Graph @dark edge

[pure brook]

is there any reliable way to test MP in editor? because for me it works fine in editor but in build it doesn't.

[vestal cobalt]

@dark edge should i do it like this?

[dark edge]

No

Just have the GS GOOFv or whatever tell your lava actor to start moving. Replicate movement might be enough, depends on how you're doing the movement

Countdown -> Get actor of class LavaActor -> Start moving

Or bind to a dispatcher if you have a lot of things that need to know that the countdown is done

[vestal cobalt]

so only replicate the code in construction script?

[dark edge]

You should just be able to use replicate movement (not sure, never used the interp to movement component) and do stuff on the server

[vestal cobalt]

this one?

on the interp

[vestal cobalt]

so i ticket that off and ran the custom event on "lava floor" in the GS_GOOGF

but there is some weird timing issues, Servers lava floor is "slower"?

Client1, 2 and 3 are all synced but the server lava floor is behind

[fallow shadow]

Can anyone help

Again I'm tryin to prevent / reduce rubberbanding

It happens while the character is accelerating, before hitting the max speed

once it hits the max speed it stops

same goes for decelerating

[dark edge]

This seems to be enough in my testing

[dark edge]

How are you doing your acceleration?

[fallow shadow]

with the CMC

More specifically

gimme a mo

 
 ​void​ ​AMyCharacter::move_forward​(​float​ Value) 
 ​{ 
 ​        ​if​ (Value != ​0​.​0f​) 
 ​        { 
 ​                ​//​ add movement in that direction 
 ​                ​AddMovementInput​(​GetActorForwardVector​(), Value, ​true​); 
 ​        } 
 ​}

and i binded the MoveForward axis to this method

[vestal cobalt]

weird! not working on my part! Server and all clients have their lava floor rising! but the server is far behind the clients for some reason :S

[dark edge]

Try activating the component instead of toggling tick on it

also don't check on tick for if it should activate, just tell it to activate

Also make sure the actor replicates

[plucky prawn]

is there a known issue with ue5 where changing replication settings on a blueprint variable causes nothing to replicate in PIE? i have to keep restarting the editor whenever i set a variable to replicate/not replicate

[timber ravine]

Hey yall, I'm looking at a directional combat system (like Mount and Blade, For Honor, Last Oasis) that takes the clients mouse input (or camera direction, whatever it might be) to determine if a player is initiating a left swing, right swing, or overhead swing. I got it working on the client side with mouse input, but do not understand the proper concepts to send that information to the server so that it knows how to show all the other relevant clients which swing I chose. Anyone got an resources for how to best tackle this?

[dark edge]

Sum the pitch and yaw over the last x seconds as a vector, determine the direction from that

A thrust would look like 0,0

left to right swipe like 10.3,1.4

overhead chop like 1.1, -12.4

er I got pitch and yaw backwards but you get it

IDK how you'd do the summation but I'd just start adding the input vectors to SmoothedInputVector and then VInterping it towards 0,0

at some lowish rate, tune to taste

So each frame
SmoothedInputVector += InputVector
VInterpTo(SmoothedInputVector, (0,0), 1.0)
AttackDirection = SomeFunction(SmoothedInputVector)

Input Event Attack -> SomeOtherFunction(AttackDirection)

[timber ravine]

Appreciate the input! I guess my question was more around the multiplayer aspect of replicating out to relevant clients versus the methodology of determining the direction. Right now it seems like the input value is getting valid from client 1's perspective, but the server and client 2 are seeing 0's for pitch/yaw. Let me throw out a screenshot

(dont mind the special attack bool)

[dark edge]

Just let clients pass over the direction.

Yeah those axis inputs are gonna be 0 everywhere that's not local

input is local only

[timber ravine]

ahhhh so thats probably my issue

[dark edge]

Choose the attack locally, and replicate that out

[timber ravine]

💡 thank you for the feedback @dark edge !!

[dark edge]

Or continuously replicate input and use that, but you'll probably end up with Client A seeing an overhead chop while Client B sees a thrust. You're better off letting Client A choose the attack he's doing

[timber ravine]

Yeah no, I'm trying to make it as performant as possible because there might be a use case where over 100 clients are considered relevant, all fighting on the ground with the ability to attack and block in 3 different directions

[dark edge]

Yeah so make your Client -> Server rpc look like
Attack(Direction3)

[timber ravine]

Makes sense! Just needed someone to point out the obvious on the input being local

Thanks again!

[fallow shadow]

please?

[compact talon]

I check if the current players is equal to or exceeds the max playercount so players cannot join full servers.

The issue is, if they load the server browser when the server isnt full, then the server becomes full, and then they join it will let them in.

Is there anyway to give a blueprint session and "refresh" it to check if I can join (for example check if it still exists, if the playercount is max, if the game already started)

I am using advanced sessions plugin

I could just do the check on the host when they join and if they aren't allowed in it kicks them, but I would rather a solution that stops them from joining at all

[fallow shadow]

im not necessarily a multiplayer genius nor do i know exactly how to do this but basically you likely want to reserve space somehow. Example:

Server 1 has 11/12 players
Player 1 is looking for a server
Player 1 finds Server 1
Player 1 tells Server 1 "i will join this match i promise"
Server 1 now technically has 12/12 players
Player 2 looks for a Server and shouldn't find Server 1 since its technically full

If Player 1's connection aborts while trying to join the server remove the reservation

[compact talon]

My issue isn't 2 players joining at the same time or similar times, it's when 2 players refresh the server browser at similar times when the server is 11/12. One player joins the server making it 12/12 but it's still 11/12 on the other player's screen.

If this player decides to join the server (without refreshing) it will let him in.

What I would prefer is if the player tries to join the server it would refresh that specific session to make sure it's still valid before joining - as opposed to kicking them after they start connecting

I am not too sure if it is possible because all the other games I have played allow you to join and they kick you during loading (after starting a connection), but it seems weird that there isn't a solution to this

[plucky prawn]

does anyone know if skeletal animations are played on the server at all? i understand it probably doesnt make sense but id like some clarity

[fallow shadow]

Afaik they do replicate on listen servers but dont on dedicated

[fallow shadow]

Oh sorry then, i cannot help

[plucky prawn]

was that aimed at me?

[fallow shadow]

yes

[plucky prawn]

ok so my issue now is that on dedicated servers, when my door animates open, because it doesnt animate on the server, my line trace on the server still hits the door even though its closed :(

[dark edge]

Are you overriding max speed anywhere? Just making sure you're not forcing acceleration by modifying max walk speed over time

[dark edge]

Show how your door is opened

The logic from key input to door moving

[plucky prawn]

im using an interface for the most part, would it be ok for me to just include that instead of the input stuff?

[dark edge]

Just show the chain from client to server

[plucky prawn]

https://blueprintue.com/blueprint/9kvbs16-/

hopefully this contains enough information. this is almost the entire door blueprint

[somber summit]

Is there any good multiplayer guides on ue4 anyone could suggest? Whether video or website?

[fallow shadow]

well i am but not over time

i change the max speed in SetupInputComponent

[fathom aspen]

Check pinned messages especially third and fourth from top

[dark edge]

You want the door to be open on server too

[plucky prawn]

yes correct

[dark edge]

Also that design looks like it'd fail if someone missed the opening state and only saw it in the open state

[plucky prawn]

ye the DoorTargetState is the one thats replicated and i just reused the same enum for DoorState

the target state only uses open and closed

[dark edge]

Just onrep bIsOpen and play the animation on a state change

Do you intend for the server side door to animate or what?

[plucky prawn]

i dont know how this would normally be done so i have no preference, as long as it works properly. the reason for the door state having so many states is because i eventually wanted to make doors get stuck partially open or whatever, its not a big deal right now

[dark edge]

You can just replicate a float DoorOpenAlpha

[plucky prawn]

ah fair enough

thats basically what the DoorPosition float would be from the timeline

except that its not replicated

[plucky prawn]

so do you think replicating this would be a better solution than my door state enum thingo? im also concerned about having the server tell the client when a door opens/closes since.. wouldnt it feel laggy? there wouldnt be any prediction

[dark edge]

You really don't wanna deal with prediction and doors, just make it sync up well. Nobody cares if a door opens 30ms after they hit the button

[worthy eagle]

Having an issue attempting to call the following function on a client

FGameplayAbilitySpec const * const Spec = OwnerASC->FindAbilitySpecFromHandle(SpecHandle);

It seems to always return a nullptr even when I verify the spec is there. It works fine on the server, not clients. Both the container holding
the SpecHandles and the component that contains them are set to be replicated. I saw where another user was having issues and calling InitActorInfo seemed to fix it but I am calling the init function on both the server and client side and I am verifying that it is actually being executed for each client.

Maybe this call is wrong, or it might need to be on bottom-most child class. Currently I am doing the set up work in a base character class.

//This gets called in both the PossessedBy, and Set up player input component functions
AbilitySystemComponent->InitAbilityActorInfo(WAKPlayerState,this);

I should also mention that I have even tried marking the ability spec as dirty and still seem to have this issue.

[plucky prawn]

i really need to get out of the microoptimization mindset.. its bogging me down

[dark edge]

Prediction is hard enough with stuff that a client is 100% in control of. What happens if 2 clients try to open/shut the door at the same time? total clusterfuck. Only do prediction where it's needed, it's a can of worms otherwise.

I would maybe try predicting a door in a RS: Seige type game but otherwise nah

[plucky prawn]

oh. i thought prediction was like a staple with anything networked

[hollow eagle]

prediction should be done only with things that need immediate feedback and ideally have minimal impact if mispredicted

which includes most basic player controls but generally not much else

[plucky prawn]

is there a way to check if only the server is calling a function? afaik IsServer will return true on a listen server host even if the client is running it

[dark edge]

The listen server is client too. there's IsDedicatedServer tho

[plucky prawn]

ye but i only want this called on the server. i feel like IsServer and HasAuthority would work for most stuff

but i bet theres a pretty thicc edge case in there

[dark edge]

The listen server host/client is both.
Are you saying you want it called on dedicated server only?

[plucky prawn]

no, i want it to work on both, but dont want it to run on the client at all. i understand that the listen server host is both but surely that still means theres a separation between client and server right?

[dark edge]

Hence why I tossed prediction right out the window on my modular vehicle game. Rocket League had a bad enough time with arcadey vehicles. Mine has realistic drivetrain and grip and the vehicles are fully modular.

[dark edge]

Same process. It's a server that has a player on it.

What are you trying to do?

[plucky prawn]

making sure that my door trigger only opens the door on the server

[dark edge]

OK then just gate by authority

[plucky prawn]

oh

[dark edge]

listen server IS authority just like if they were playing standalone

[plucky prawn]

right

[dark edge]

Really the only difference between listen server and standalone is whether or not you're open for connections

In our project you actaully are always a listen server (so multiplayer can be seamless for the host)

[plucky prawn]

im still not entirely sure how to fix my line trace issue since the door doesnt actually open (with animation) on the server, so even though the door is open on the client, the server still thinks its closed and the line trace on the server and client dont match

[dark edge]

Do you want it to open with animation on server or not?

[plucky prawn]

ye i guess unless theres a better option

its a 2 piece door

if that makes any difference

[dark edge]

Is it a skeletal mesh or 2 static meshes?

Anyway, just onrep SomeStateVariable and have that drive it

in BP the onrep will fire on server too

in C++ you'll have to add that functionality

[plucky prawn]

skeletal

[dark edge]

OnRep bDoorIsOpen
Play timeline
play animation
rotate bone
whatever

[plucky prawn]

i was driving it with a timeline in the bp i shared earlier but it didnt seem to work on the server

[timber ravine]

@dark edge my directional combat is now working flawlessly, thanks to you again good person! I was getting so frustrated because it seemed like it should work. Instead of getting values directly from input, i checked input and set an enum, replicated that and voila it all works as intended

one of those "i know its something obvious, but i've been looking at this so long i don't see it"

[cyan drift]

Hello, I´ve attached my characters to other actor so they can move together, but on the clients the animations of the characters doesn't update, it stays on idle. anyone know what could I do to fix?

[dark edge]

How are you driving the character animations?

If it's by velocity, I'm pretty sure velocity is always relative to parent.

[cyan drift]

yeah, it's by velocity that's why isn't working, i've tested now with a created variable and it work

[upbeat basin]

Is there an example of DemoNetDriver with In Memory Streamer that explains how can a kill cam can be implemented, without disconnecting the player from the gameserver to show the replay? Maybe I'm not able to understand but it feels like the official docs are not enough to just look and understand how to use it

[fathom aspen]

I'm not sure if this is what you're looking for, as I haven't looked into it yet myself, but it's worth looking into 2nd pinned channel message from top if you haven't done so already

[ashen stone]

are options passed to openlevel encrypted? if not, is there any secure way to pass it?

can i pass a JWT here? (Json Web Token)

[upbeat basin]

Oh I wasn't aware of it. It looks promising. Thanks for pointing out

[static flare]

I need custom rotation to avoid gimbal lock. I'm struggling with replicating this rotation from one client to the server + other clients, as I don't fully understand replication yet.
As far as I understand, simply having a variable marked as UPROPERTY(Replicated) and changing it on the client won't replicate it to the server.
Does this mean I have to implement RPC function such as UFUNCTION(Server) void RotationChanged to call from the client, which should then call a UFUNCTION(Multicast) out to all clients?
Obviously I need to apply the rotation-change instantly on the client per tick, but I certainly can't call an RPC to the server on every tick, so is there some sort of auto-throttle involved I can utilize, or do I have to use a custom Timer or accumulate with DeltaTime to let the client decide how often it wants to send this information? And when the server multicasts back, how do I prevent the original client from updating its own rotation to its previous rotation (if still rotating)? And should I pass the actual rotation-value, or the accumulated "change" in rotation? If only the change, how do I ensure that they are correct over time?

[latent heart]

Nothing ever replicates to the server from the client.

The only thing that operates that way are RPC calls.

Why can't you rpc every tick?

[chrome bay]

You have to throttle it yourself

[static flare]

Because it sounds severely inefficient and useless to call a server rpc 240 times per second when the server only runs at e.g. 60hz. And if I send the actual target-rotation value, I don't need it to receive all the accumulated values between each server tick either, I only need the "last" value.

[chrome bay]

Sounds like you want a client-authoritative solution, so you would send the transform or whatever it is to the server at a given rate, optionally throttling it. Server would replicate those values to other players as replicated properties. Remote clients would have to "smooth" their local copy between updates.

[static flare]

Damn, I would've thought replicating values to server had a nice default implementation not needing rpc.
Yes, I do want client-authoritative for nearly everything actually.

[chrome bay]

Character Movement packs moves together quite aggressively to avoid calling RPC's every tick (and those RPC's are unreliable)

[latent heart]

Bear in mind if you send the actual rotation, it will be rounded.

Probably.

Not sure if RPC rotations get quantized like property ones.

[static flare]

Does default character movement have a default "tick rate" for replication?

[chrome bay]

They don't nah, replicated movement rounds it's internal rotation but nothing else does

[chrome bay]

No, it's an unfixed rate by design

[latent heart]

Oh fair enough!

[chrome bay]

UE's character networking operates under the idea that every client is probably simulating at a different rate.

Moves that are continuous (i.e, just moving forward) are sent less often than "important" move changes etc.

It's quite complex

[static flare]

Oh yikes.. Guess I'll start with just a low fixed rate of rotation RPC and take it from there then.. And that I should send the actual target rotation unreliably rather than the added offset from previous, to avoid errors that I'd have to sync. And "animate" the rotation from Old->New over that fixed tick-rate length of time. Or perhaps store the last timestamp, and animate over now-lastTime seconds, since they're unreliable..

[chrome bay]

The idea is that you apply the changes to the "collision" part of the mover instantly

You only smooth the visuals

Character Movement for example "snaps" the capsule instantly, but offsets the meshes relative location/rotation and smooths it over time. The smoothing + animations hide the snapping/blending

You won't get a steady stream of updates either way, so you can't blend at fixed rates

In the real world, packets will get lost, jitter occurs etc.

[static flare]

Holy shit. I'm currently using AddMovementInput for regular movement, and just need a custom replication for rotation (which won't trigger collision stuff in this particular case), so hopefully I'm able to avoid all that, and can live with a bit of rotation jitter. (Regardless of replicated rotation, the position is still correct).
I might need client authoritative positioning in the end, but I hope and assume there's a way to still use AddMovementInput for position replication without the server trying to correct it, rather than having to implement all of that stuff.

[chrome bay]

AddMovementInput doesn't really do anything, it just locally adds the values to an accumulating vector

Or at least, there's nothing MP-specific about it

Character Movement just takes that vector and puts it through all of it's complex networking

[blissful totem]

I'm trying to swap out some bool vars on my character to use the tag system instead. Is there a way to trigger rep notify events on tags, in blueprints?

These are tags on the GAS ability component system so they should be replicated

[chrome bay]

Rep Notifys will work the same way for gameplay tags

[blissful totem]

But how can I set them up in blueprints

@chrome bay just editor interface wise.

[chrome bay]

Same way you would any other property

Add a gameplay tag variable, mark it as replicated using or whatever the BP function is

[blissful totem]

@chrome bay These are being stored in my ability component system's list of tags though. I'd rather not duplicitiously track the tags on the ASC and the pawn

[chrome bay]

Well you can't add a rep notify to the pawn then

The ability system has dedicated callbacks in C++ for when tags are added to it

That's not exposed to Blueprint

[blissful totem]

The GAS shooter example seems to set up this async task like this

UAsyncTaskGameplayTagAddedRemoved* UAsyncTaskGameplayTagAddedRemoved::ListenForGameplayTagAddedOrRemoved(UAbilitySystemComponent * AbilitySystemComponent, FGameplayTagContainer InTags)
{
    UAsyncTaskGameplayTagAddedRemoved* ListenForGameplayTagAddedRemoved = NewObject<UAsyncTaskGameplayTagAddedRemoved>();
    ListenForGameplayTagAddedRemoved->ASC = AbilitySystemComponent;
    ListenForGameplayTagAddedRemoved->Tags = InTags;

    if (!IsValid(AbilitySystemComponent) || InTags.Num() < 1)
    {
        ListenForGameplayTagAddedRemoved->EndTask();
        return nullptr;
    }

    TArray<FGameplayTag> TagArray;
    InTags.GetGameplayTagArray(TagArray);
    
    for (FGameplayTag Tag : TagArray)
    {
        AbilitySystemComponent->RegisterGameplayTagEvent(Tag, EGameplayTagEventType::NewOrRemoved).AddUObject(ListenForGameplayTagAddedRemoved, &UAsyncTaskGameplayTagAddedRemoved::TagChanged);
    }

    return ListenForGameplayTagAddedRemoved;
}

[chrome bay]

That's an async task for use in Gameplay Abilities

But either way, this functionality to listen for tag changes is not exposed to Blueprint

You can see the function it's calling

RegisterGameplayTagEvent

Or alternatively RegisterGenericGameplayTagEvent()

[blissful totem]

Yes, but is there any strong reason not to leverage this to listen for tag change events and set up "notifies" manually in a bp?

[chrome bay]

I don't see why not if that's what you need

But you mentioned "RepNotify" which is a very different thing

[blissful totem]

Is it a different thing? A rep notify event is triggered when a new value is received and is not the same as the original. No?

Including, when a server sets a new value on itself without any replication per se

[chrome bay]

No it's not the same

A rep notify is an engine-level concept where when a property updated is received on the client, a function will fire

You're setting up a dedicated system to listen for changes to tags, it's completely different

Also Rep Notifies (In C++) only fire client side. Blueprint rep notifies are a joke and fire whenever the property is changed, they actually have little to nothing to do with replication in BP.

[blissful totem]

That explains... some other issues I've been having

So would you say this manually constructed system is approximately the same as the joke-y bp rep notify functions? :p

[chrome bay]

I don't know, I've not used GAS Shooter

[blissful totem]

fair enough

[chrome bay]

No idea how that async task works, but async tasks are usually meant to be used inside abilities and share their lifetimes

Whether that one can work/live outside of it IDK

[blissful totem]

I think asynctask != abilitytask

[chrome bay]

yeah they're not identical. Maybe that node isn't an ability task

[blissful totem]

ok thanks. this was all very helpful

this async task includes some notes about how it needs to be manually ended to be garbage collected, which is sure to cause me a headache at somepoint but I think it's at least not expecting to live with an ability per se

[static flare]

Yeah, that's what I meant. I'd like to keep using the complex networking for positioning, but as client authoritative. If that's not possible I guess I'd have to replicate my own movement and will lose the complex networking. But I haven't looked into any movement yet, only working on rotation atm, where the default addPitch/Yaw/Roll suffers from gimbal lock.

[high ibex]

hello all, in games like pubg mobile, there are lot of skins, shirts, cloth packs, helmet skins etc available to unlock after completing missions and owning them. Does the game downloads and retrieves whatever unlocked from cloud/servers after they are unlocked or do they download all of them and store in player mobile so that when ever a player unlocks certain item, it will be ready to apply to meshes? Thanks for answers

[chrome bay]

The assets always exist in the local game. "Unlockable" usually just means giving you permission to use it.

[high ibex]

okay, thank you

[twin juniper]

hey guys, what entities exist on the server side beside game mode?

and what variables should I put on the game mode? will it be like Player stats and their inventories?

[vestal cobalt]

Picture 1
Player Controller (PC_GOOGF)

Custom event (ShowCountdown )
Executes on Owning Client

Picture 2
Game Mode (GM_GOOGF)

Event tick
Loop through all connected players
Display widget (Show Count Down)

This is all fine and good right?

Now, the server should do the countdown right? where should i put that code? in Game Mode or Game State or?

[crystal crag]

If you had to store an array of actors that the player was tracking, would you put that into the player state or instead place it inside of the controller / pawn?

@vestal cobaltIf you have game state data (such as a countdown), then that would belong in the game state

game mode does not get created on the clients

the game state however does get created / replicated between the server / clients

I haven't looked at your BP graph screenshot, but one thing to watch out for is the dedicated server typically doesn't have UMG enabled

It would be better to separate the UI from the server if at all possible

(I say this knowing there is a checkbox to let dedicated servers run UMG, but why?)

[vestal cobalt]

what do you typicaly have in the Game Mode tho?

[crystal crag]

Rules for the game

Things only the authority should ever have to know

Actually that is not the best description. Instead use this documentation as it gives more clear guidance. https://docs.unrealengine.com/4.27/en-US/InteractiveExperiences/Framework/GameMode/

[vestal cobalt]

yea nice! 🙂 ty for that

[crystal crag]

Anytime

[vestal cobalt]

yea so basic boildown

1. Create Widget (CountdownWB)
2. When everyone has loaded in to the map display said Widget
3. Do the actuall countdown (in Game State now)
4. Check if countdown is done (= 0?) then unfreeze players (at game start every player is freezed, they cant move)

the problem is that the way i display the widget to all players is this using the "Players" array that holds every Player Controller that are in the game

should i do it another way or?

the "Player" array is in the Game Mode

so i would need to cast to Game State in Game Mode and then copy that player array over to Game State :S dunno if that is bad or not

[crystal crag]

Just a heads up, GameState I believe even its Base form has a Players array, which holds all player states in the game

you could get the controllers from the player states

[vestal cobalt]

oh

oh yea look at that

it does!

hmm in Game State i cannot access "Show Countdown" function in the Player Controller

what am i missing

[quasi tide]

A cast to your player controller

[vestal cobalt]

there we go 🙂

[quasi tide]

You can hover over the return value and it tells you the class (which would most likely be just "Player Controller")

[dark edge]

You have a bunch of player controllers. You don't know if they are YOUR SPECIFIC SUBCLASS of player controller.

[vestal cobalt]

so now i have that problem that i play inNew Editor Window (PIE) with Number of players : 4 and the last client takes to long to load in that the countdown widget never shows up!

in Game Mode i made this little function (Dunno if it is stupid or useless but it works)

so i checked if all players are loaded in befor i ran "Show Count Down" function

[vestal cobalt]

in Player Controller have i done anything wrong here?
when i exit game i get

The widget 'WB_Countdown_C' was already added to the screen.
The widget 'WB_Countdown_C' was already added to the screen.
The widget 'WB_Countdown_C' was already added to the screen.

3 times

[winged badger]

that oart if fine

if you're actually calling this 3 times, that i can't tell

[winged badger]

also fine

[vestal cobalt]

so it just tells me that Is Valid was valid

[winged badger]

you have a more elegant way to iterate PCs from blueprint

GameMode-<GetNumPlayers -> for (0 to NumPlayers -1) [body] GetPlayerController[Index] -> Cast -> Call RPC

its the only safe and appropriate use of GetPlayerController[Index] too 😄

[winged badger]

didn't know that one existed

[vestal cobalt]

neither did i xD

just found it

[winged badger]

what calls ShowCountdownWidgetToAllPlayers?

[vestal cobalt]

in Game State @winged badger

[halcyon totem]

I am using advanced sessions if I run a dedicated server, which subsystem besides steam can I use to check?\

I want to see if I can see it online and connect

[winged badger]

unless you prevent it from doing so

that Tick will run on all instances of GS on all machines

if yoiu run it from GameMode it will only run on server

[vestal cobalt]

so run the "Show Countdown WIdget To All Players" on Game Mode and the actuall counting down (variable and function) in Game State ?

[winged badger]

its how its designed to work, gamemode is supposed to have high level control over the game and gamestate is mostly there to help let the clients know about it

you can leave ShowCountdown in GameState that is fine for its purpose

but the entry point should be GameMode

[vestal cobalt]

@winged badgerso currently im doing the countdown itself inside the Widget

[winged badger]

that is fine, itsd abit on approximate accuracy side

but i don't think it mastters for this

[vestal cobalt]

the only thing is i would need to somehow know when the timer hits 3 seconds in the Game Mode

[winged badger]

why?

[vestal cobalt]

as when the players load into the map they start possessing Cameras that overlooks the map (and the countdown begins) and then at 3 seconds left they shift to possessing the actuall player pawns

[winged badger]

ah, this is game level, not the lobby

well, GameMode should definitely do that then 😄

[vestal cobalt]

but how can i get the "timer" variable over to Game Mode tho

the widget is created in Player Controller

[winged badger]

you don't want to spend an hour looking for where you put that logic every other month when you forget

you can use alternate approaches

like write the GameStart time in the GameState

have the widgets show from OnRep

and run the timer from replicated server time that the GameState alreayd replicates under the hood

but generally

timestamp it

[vestal cobalt]

repNotify?

[winged badger]

yes

there are plenty of ways to run the timer

my having it read the end time from, say gamestate when instantiated

then displaying endtime - currentgametime as time remaining for example

[quasi tide]

I'd just send the initial time, then an RPC to start the timer and let it tick locally. Only when the server hits 0 to actually unlock control for the players and all that.

[winged badger]

and then gamemode who put the end time there to begin with can just read it

[quasi tide]

Sure there could be issues with times appearing to be slightly off, but meh.

[winged badger]

nothing anyone would notice unless they are playing side by side and both as clients

[vestal cobalt]

so i could run the timer in Player Controller or even Game State ?

[winged badger]

if you have the gamemode inform the widgets (indirectly) of what is either their start or their end time

the gamemode knows how long till 3 seconds left

as it basically declared when that will happen in advance

and widget can run just fine

one thing you really do not want to do is have a game critical logic in the widget

game has to function just fine if you completely replace the UI

or you'll learn to regret it

another point here, a HUD derived class is designed to create and control widgets

it has 1:1 relationship with the PC and exists only where the PC is a local controller

[vestal cobalt]

@winged badgerso i did this

In Game State i created a variable currentCountdownTimer (set to replicated)

In Game Mode i did

and in the Countdown Widget i created a binding

Server and client 1 works fine but Client 2 and 3 it just says "GO!"

this should work right?

[vestal cobalt]

@winged badger going to bed can you PM me or tag me with an answer so i can check it tomorrow

[plucky prawn]

you might be better off not using a timer, but instead using GameState (Which is replicated to all clients), setting a float with your target time using GerServerWorldTimeSeconds as your base time, then offset it with your actual timer value. so if you want a 30 second timer, you would just set your replicated float value to GetServerWorldTimeSeconds() + 30 then to get the countdown from 30 to 0 on the client (or server) it would be replicatedTimerValue - GetServerWorldTimeSeconds(). its not as pretty but it will definitely work better than whatever you are trying to set up. if you dont want a floating point value you can truncate or round it to an integer and id probably clamp it at 0 since some clients might experience a ~100ms variance and will show negative numbers if you just print it to the screen. you could also wrap this up in a macro so you have a more timer-like API

[plain spade]

Whats up yall
I'm trying to make a host game menu, but I'm not sure how I can make it so I launch a lobby without reloading or changing the level I'm currently in. Any advice?

Like how you can start a LAN world in minecraft while staying the same world

[plucky prawn]

Hey lads I'm having an issue where my door is opening on the client (and the time line that opens it is running on the server, so is the onrep function that drives the ooen/close blendspace) yet I can't walk through the door when it's open. When I start the blendspace on the open animation I can walk through it fine. Here's some videos that hopefully demonstrate more of the problem. I posted in #legacy-physics but I feel like this is more of a network issue. I have not tested this in standalone or as a listen server and the videos are shown with PIE as a client and a dedicated server in the background. https://media.discordapp.net/attachments/221799426820276226/971911924835041360/UnrealEditor-Win64-DebugGame_jcid8fvEZE.mp4 https://media.discordapp.net/attachments/221799426820276226/971911979730104340/UnrealEditor-Win64-DebugGame_G2rQkgeSPE.mp4

[plain spade]

nvm I got it

[meager fable]

AGameModeBase::PreLogin has const FString& Options but how do I pass them when joining a session? I'm currently joining via IOnlineSession::JoinSession(const FUniqueNetId& LocalUserId, FName SessionName, const FOnlineSessionSearchResult& DesiredSession)

[real ridge]

guys how can I find out number of players connected to one port ? for example :7777

[static flare]

Can I prevent the owning client of an actor to receive replicated values of a variable?

[solar stirrup]

COND_SkipOwner

[livid mist]

Hi, I can't for the life of me figure out why other players can't see my Niagara particle system I'm spawning on the characters. If I put it in the character itself, they can see it, but as soon as I try to spawn/despawn it or change its visibility with code (blueprints), the other player can't see it, only the one who spawned it. Why is this happening? 🥲
The code happens inside a function that already replicates so I can't figure out why it's not working.

[winged badger]

show the code

[livid mist]

The spawn function:

and it happens within this function

Gonna do a test rq

[winged badger]

it executes on server only

looking at this

[livid mist]

Would I change the second event to multicast? I've tried it

[winged badger]

it would kinda work, but badly

[livid mist]

If I just add the particle system to my character bp they can both see it

[winged badger]

multicasts can't really handle stateful changes

[livid mist]

buuut I need to turn the particle on/off

[winged badger]

because its the part of your (replicated) character

so they can both see it

you should replicate the State (Flight) itself

then spawn the particles from OnRep

[livid mist]

Oh that's a good point

[winged badger]

otherwise, lets say im standing 16000 units away from you as a client

[livid mist]

I do have a "is flying" variable in my character, I could try putting the particle spawn in the repnotify of that

[winged badger]

you start flying, you multicast the particles, but you are not currently relevant to me, so i don't get the MC

i come closer and MC being fire and forget won't retroactively execute on my machine

so no p[articles for me

in contrast, if you replicate state, when you become relevant, your character replicates its stuff, among those, the fact that he is flying

and my machine spawns the particles

same scenario applies to hot joiners

(only for hot joiners, bAlwaysRelevant won't save you)

[livid mist]

AHH putting it in a repnotify worked sort of!

[winged badger]

so MCs are mostly for effects, bomb goes off, explosion and sound happen that moment

[livid mist]

and I see 🙂

[winged badger]

and doesn't matter if someone enters the area, he shouldn't see it anyways

anything statefu, use replication instead

[livid mist]

omg it worked, thank you

So on repnotify should I do a flipflop and on A have spawn particle, then on B have destroy particle?

nvm that didn't work lol

Okay I just did a branch instead and that works! 🙂

Also, while I'm here, I have an item pickup system- but if the player carries the object out of render distance and then comes back with it, the other player won't see it anymore until they drop it. Not sure how to keep it loaded in

It still works it's just a visual issue

[winged badger]

non relevant actors on clients are destroyed

and spawned again when they enter relevant range

so you're dealing with a brand spanking new instance of that pickup here

it will attach itself where it needs to from under the hood OnRep_AttachParent

but rest is up to you

[knotty mason]

hey guys!

i have a problem -- weapon doesn't want to call it's own server functions through client (it puts to console Client is absorbing remote function ... on actor ... because RemoteRole is ROLE_None) -- i tried putting ticks on actor Replicates and Component Replication for each component -- warning disappeared, however bug is not solved yet :))

what am i doing wrong

[chrome bay]

The actor needs to be replicated to call Server functions. It also needs to have been spawned at runtime on the Server only, and replicated to the Client

It should also be owned by one of the clients' owned actors, like it's pawn or controller

[plucky prawn]

bumping in case anyone has ideas. here is a somewhat updated version of the door blueprint im using. DoorPositionAlpha is the only variable that is replicated and its only set from the server. https://blueprintue.com/blueprint/uujrgyrj/

[knotty mason]

ok, got it, thanks!

[regal mica]

So project is getting to the point where it would be reasonable to test stuff out with other players. Are there any good tutorials on setting up a proper multiplayer environment over the net? Ie everything I need to do from start to finish so my friends can open up a client on their own computer at home and connect to the same session as me?

[knotty mason]

well 🙂 now it doesn't spawn my weapon actor through server function called in BeginPlay because it says that my BP_MyPawn has no owning connection

[chrome bay]

If it's an animation, they don't play on Dedicated Servers by default

[plucky prawn]

thanks, thats understandable. do you happen to have any suggestions to achieve this? (literally opening a door and making it work nice)

[chrome bay]

On the Server you can set the doors' skeletal mesh to "Always Tick Pose and Refresh Bones"

[plucky prawn]

mate you are like multiplayer jesus

[vestal cobalt]

ty for that! i will deff try that

[plucky prawn]

either be a listen server or you need to RPC to the client the data needed for the widget

whats the situation? like give us a real world example of what you are trying to do

im not sure exactly what your setup is but you could just make a Run on Owning Client RPC with the data you need. like maybe a bool input for success/failure or maybe a struct with each field with a bool and error message or something

the reference is on your player controller. i dont want to say "normally" because i dont know if thats correct, but if you need a reference for later, store it somewhere. it seems like maybe HUD or just the PC itself could store a reference to this widget, then when the client RPC is called, just grab that widget (and check its validity) then maybe call a function on it like "OnResponse" or whatever

[vestal cobalt]

so i got a bit confused (please excuse me)

this is in Game State! so i make a Float Variable named countdownTime (and this should be replicated)?

[plucky prawn]

yes it should be replicated

but dont set it on BeginPlay

unless thats when you want it set...

id honestly just make it a macro that does GetGameState -> GetServerWorldTimeSeconds -> SetCountdownTimer

[vestal cobalt]

in a Blueprint Macro Library ?

[plucky prawn]

sure

just make sure its Actor

otherwise you wont have access to any of the World stuff like GameState

[vestal cobalt]

ok

so i created it and selected Actor

[plucky prawn]

looks good

sometimes network do be like that

[vestal cobalt]

@plucky prawn would i then run that macro in Game Mode or?

[plucky prawn]

because you selected Actor you can use this macro in any Actor

including GameMode

also note that if you call this macro from the client it will not replicate to the server

[vestal cobalt]

just a quick side question here! is this a valid way to check if all players have loaded in?

[plucky prawn]

how loose is your definition of "loaded in"?

[vestal cobalt]

i mean, when i started this project and i tried to add countdown widget "to viewport" it would only popup on Server and Client 1 and not 2 and 3... so i made this so "add to viewport" would only fire on True! and well it worked but i wanted to make sure that this was "valid" to use

[plucky prawn]

the way you are implementing it now will replicate to all clients

if you want to know if all clients are present in the game and ready to play, thats more of a side quest

[solar stirrup]

Easy way is for clients to send an RPC to the Server when they deem themselves ready to start

Wait for all clients to be ready on the server.

[plucky prawn]

you can automate this but its honestly better to just have players declare themselves ready

[vestal cobalt]

that is kinda what i want tho! so

1. Load the map
2. Wait for all players to load in (be ready to play)
3. Display countdown widget
4. Start the countdown

[plucky prawn]

ye

ezpz

[solar stirrup]

Exactly what I do

For my project, each client sends an RPC to the Server when the PC, PS and GS have all begun play on their side

[vestal cobalt]

so i could just in Player Controller make them press a button (say space) or anything that will then send to server that they are ready?

or am i wrong?

[solar stirrup]

Sure, or just send it automatically in BeginPlay()

[plucky prawn]

if you want or do what @solar stirrup suggested which is also how i do mine

[vestal cobalt]

correct me if im way of! so in Player Controller i would make a Custome Event and set that to Run On Server and Reliable?

[visual urchin]

Hey, guys. I'd like to implement an online system to my game. Just as a few extra detail, it's 4 players co-op and P2P (no server involved).
First time I made an online game was using Unity (Mirror Networking) and was a mess trying to figure out things on my own.
Do you happen to know an online course or a good tutorial where I can learn the fundamentals (or even more) about online in UE4?
Disclaimer: I'm still googling, but back then it took me a few months before finding the correct educational material that actually helped me understad Mirror.

[hasty quartz]

Hello, can anyone help me with possessing an actor or a pawn(?) on client? Seems like possession works but camera doesn't change.

[vestal cobalt]

@plucky prawn @solar stirrup

[solar stirrup]

yep

@vestal cobalt

[dawn ledge]

P2p is not supported by UE networking, it uses server-client model. You can avoid a dedicated server by having one of the clients act as a server (called a listen server). Search for Cedrik Neukirchen's network compendium for a good explanation of UE multiplayer

[visual urchin]

Thank you! I'll take a look at that!

[quasi tide]

It's also a pinned thing in this channel. Just FYI

[limber echo]

Can some players be on 1 level and some players be on 2 level? And travel to each other? Is it possible with advanced session plugin?

[verbal hinge]

Hey, I got a bit of an issue. Probably something really simple to solve though. I'm trying to make a server build but I get a "corrupted files" error with this message on the terminal:

Seeked past end of file /Engine/EngineResources/WhiteSquareTexture (129645 / 3851)

I'm just using the 3rd person sample to do this build

Client build is fine

[fallow shadow]

Im getting rubberbanding while my character is accelerating/decelerating with the character movement component

as soon as it hits max speed the rubberbanding stops

any ideas?

I could just make the character go at constant speed but that's ass

[dark edge]

By accelerating you mean accelerating within the context of the CMC or are you varying max speed over time (trying to do acceleration yourself)?

You just have a low acceleration value right, leaving the max speed of the CMC constant

[fallow shadow]

Within the context of CMC

[fallow shadow]

yes, if i have to change the max speed i do it in the constructor (or right after the constructor (BeginPlay))

[wild aurora]

Hey guys, when I call ServerTravel on a player server, sometimes a client will receive the request to travel to the map they are already on instead of the one the server is requesting, all other clients get the right map however. Any ideas what may cause this? (client also in this case ends up loading the map earlier than the host too)

[magic yoke]

I know it's super basic, but I've followed tutorials and checked guides

I'm trying to make a widget appear on two clients

but I either get errors saying viewport is none, or I get 2 widgets on the same screen (if I'm using a listening client)

[velvet kettle]

Try get owner controller instead

[magic yoke]

owner controller? I can't find any calls to that specifically except in AI stuff

I tried get player controller from player state, but it seems like everything is running on the server and not actually in the target clients

works for the server client, but kicks back that it's not a local controller for the second client call, making it seem like it's still running the code on the server not the client

[latent heart]

Maybe it is.

[magic yoke]

yeah... no matter what replication form I choose

same result

it's all running the code serverside

which is really weird, I copy pasted code from a tutorial into the same class and it just didn't work lol

[velvet kettle]

my bad i gave you the widget controller function, the pawn/character one is just Get Controller, then you cast it to your Controller

[magic yoke]

where would I be putting this code normally, to make a client side widget?

inside the player pawn class?

I've tried player pawn, game mode/state, player state, player controller

everything I try just runs all the code on the server

for some reason

[velvet kettle]

i generally prefer to use my custom Hud class which is client only but you can also use the PlayerController with Switch Has Authority -> Remote -> *Client logic

since the player controller exists on both the server and the client then you will run into issues creating widgets unless you make sure the Authority is client side

[magic yoke]

but you think having a specific client side class makes more sense?

[latent heart]

Why do you have a special event to initialise the UI instead of, say, BeginPlay on the pawn?

(or controller)

[magic yoke]

mostly because I've tried a million iterations of this

that was one of them

not the one I screenied

I've been smashing my head on this for a while ><

[latent heart]

A HUD class is a good choice.

Try it.

[magic yoke]

where would I initialize it so it's actually client side?

I know this is dumb but I trust nothing anymore XD

since all the tutorials have flat out failed me

[latent heart]

You can set a HUD class on the PC I think? Or game mode?

Probably game mode...

[velvet kettle]

Agreed, also just in case you were not aware, the Hud is client only. Think of it as the player's screen.

[magic yoke]

game mode only ran once when server starts no?

[velvet kettle]

it is set in the GameMode

[magic yoke]

ooooh

[latent heart]

But the game mode will tell your PC which class to use.

[magic yoke]

a setting

erm

well

this is my new HUD class

set in the game mode I use

which, since I only want local visual stuff on the screen

that seems like all I'd need?

[latent heart]

Pretty much.

[magic yoke]

only shows on the listening client again, not secondary...

[latent heart]

That's a bit odd.

Is it failing to create your widget?

[magic yoke]

no text error

just doesn't show

only the server and client 1 are trying to run it

client 2 never tries

welp

I'm friggin dumbfounded

@latent heart @velvet kettle I made a dummy test in about 5 minutes, input just the suggested code and it works

but that doesn't work on my project lol

[latent heart]

Heh.

Maybe try changing the widget it's trying to add?

[magic yoke]

hm

will test

loe and behold

yep

it's something about my widget that's the issue

I think the strange thing there is that said widget silently errors when you try that

but looking in it there's a chunk of code so there could be an error baked into it somehow

[velvet kettle]

i'm sure you will figure it out

[twin juniper]

as someone coming from outside of ue, what is the setup for multiplayer?

things you need to keep in mind from the start so to speak

ie dont convert a single player to multi 😄

also how does that work with blueprints, are they client side

i assume bp when compiled are part of the source?

[latent heart]

Game mode isn't replicated.

Never assume that things are replicated in any kind of sensible order.

Replication doesn't happen from client to server.

Go

Yes, bps will exist on both server and client, similarly, begin play/etc will run on both server and client.

[halcyon totem]

can we run server on old laptops? We dont need to have super fast video cards or the newest 19 processor right? I just want 12 players per server thats doable with a laptop on a good ISP?

[latent heart]

Probably, for a single server...

Depending on the laptop ofc.

[sacred spire]

Does event tick do the same as beginplay on both server and client too?

[latent heart]

Yup, both server and client will tick.

[dusk basalt]

is it ok to pass values to server functions?
or is this like a big no no

because in my mind when someone shoots, right, it makes sense to me to calculate the position and rot on their end, then pass that value to just spawn the bullet on the server.

I'm still new to multiplayer, and I am still not quite sure what huge server overload or whatever looks like, and idk if calculating the spawn location on the server is bad

[limber echo]

Can players be on different levels? And travel to each other any time?

[blissful saffron]

I have the beginnings of my game but when I test it in PIE with multiple clients (in listen server mode), as soon as I cast an ability (GAS) on a client, that client seems to disconnect or something. He can no longer be seen by the other clients and can't see them either. Any ideas what I've broken?

[tame sapphire]

Is there any documentation or guides on Multiplayer player basics, i get how to cast from within the GameMode to the GameState in order to update the PlayerController and which of these exist why and where (Thanks to exi's network pdf).
However I'm more interested in actual examples of wether i should be running an event/function to update say the score in the GM or GS (Game mode updates a score var thats on the game state or should the game mode call the score from the game state and update it there...)
I'm guessing GS and The Rule that governs scoring is in the GM and that that calls an update score function in GameState but id really like some basic info around this and similar best practice. (This could be a confidence thing or a methodology on my part) but just seen so many different ways of doing it that I'd like a direction on which and why

[latent heart]

i get how to cast from the GameMode to the GameState

This is never a thing.

Imo (and people's opinions vary) I don't think game state should have any controlling logic. It should hold state information, like scores, teams, etc. The game mode should be responsible for updating everything. The game state is also useful for any kind of global broadcasts you want to do (like chat systems, etc.)

[tame sapphire]

@latent heart So you wouldnt have anything like this in GM to update the GS?

[deep geode]

I used to do all logic in gamemode as well. Then hardlinked with controller. Its Way easier if its in gamestate since its replicated and more tied into the playerstate which is also replicated.

[latent heart]

I mean, you can have logic that needs to run on the clientside on game state or the pc... but server-authoritative logic should be only on the game mode.

[latent heart]

That's not casting a game mode to a game state. That's getting the game state from the game mode and casting it to your particular game state class.

Wording is important.

If you use the wrong words, you may misunderstand what a) you're doing b) what the engine does c) fail to communicate what you're doing d) misunderstand what people say when they try to help you.

[tame sapphire]

i never said/typed casting a game mode i used from

[deep geode]

Hmm what would you call exclusively server quthoritative logic? An example would be good.

[latent heart]

Changing player or team scores would be a big one.

Deciding if a player can use a particular item (based on their team,) for instance, is probably good client side logic.

But you'd still verify that on the server before actually using the item.

Everything is pretty much dependant on your game, really.

[latent heart]

Apologies. I missed the 'within' word. I'm still half asleep.

[deep geode]

That case would be better handled by gas though. Since it could hamper gameplay responsiveness

[latent heart]

Probably, yes, I really couldn't think of something else. 😛

[deep geode]

But staying on topic, there really isnt any golden rule

Only if you have a team or convention already set up

[latent heart]

You could just put all your logic in the game state and it'd be perfectly fine.

[tame sapphire]

thats what i was wondering

[latent heart]

It really makes no difference in the end, except to hackers/cheaters.

[tame sapphire]

but evidently wanted a best practice route

thank you

[deep geode]

If you consider epic a best practice, lyra is heavily using gamestate

[latent heart]

Epic is rarely best practice 😄

They use deprecated stuff in Lyra already. Their engine code is a mess of conflicting standards, etc.

[deep geode]

Really? What deprecateds stuff?

[latent heart]

The GENERATED_UCLASS_BODY macro isn't meant to be used any more (I believe anyway,) it was replaced with GENERATED_BODY ages ago.

Maybe they have a reason for it, shrug

[tame sapphire]

as theres an all players array in the GS would you use that in the GM or do an event postlogin to create an array of all connected player controllers?

Im wanting to check if all players are ready to do x

[latent heart]

The "is ready" var should be on a player state, not a player controller.

[tame sapphire]

i was updating controller from state

so had in both

but thats easily changed

[deep geode]

Player state array afaik is an updated list of playerstates in session. I used to hold a list of controllers ingamemode on post login. I have to manually update it whenever a player leaves or what. Playerstate array in gamestate is updated

[tame sapphire]

well so far i have this in my GS but am wondering if it should be in GM

[deep geode]

Yup. I have a comp in GS that manages howmany players are ready. PS can communicate to GS to tell if ready

[latent heart]

Why not just use the World methods to query the controllers?

[deep geode]

If youre feeling spicy you can do it on the clients GS aswell

[tame sapphire]

because im just googling that now as its the first ive heard

[deep geode]

Way cleaner if you make it apure function that returns false it one player in the loop isnt ready

[tame sapphire]

true but i was thinking i want to extend it to tell everyone who is and isnt ready

[deep geode]

Then use a dispatcher

Rep notify wont call unless its being changed

[latent heart]

I like the current implementation. But it relies on you triggering that event at every required point.

@tame sapphire the player states are already replicated, so a bool on a player state will already tell everyone who is and isn't ready.

[tame sapphire]

well would a event by timer work in gm that check if all ready or a var reaches 0? as theres going to be a 20second time limit anyway this check is just to cut short the timer

[deep geode]

Check if all ready whenever someone presses ready

[latent heart]

Or when a player leaves

[deep geode]

Damn fckn edge cases

[tame sapphire]

I should note that down but in this instance if some one leaves that shouldnt effect game play

[latent heart]

If 10 players are ready and 1 isn't. If that one player who isn't ready leaves, all players are now ready.

[tame sapphire]

yeah

and after the 20s decision timer the turn progresses to next state

so he kinda has 20s to reconnect and make his decision or miss that turn

if he leaves permanently then for now its unlucky on that team

[latent heart]

So it does affect game play 😛

[tame sapphire]

lol, ok you got me!

I am thinking of moving all players ready into the GM though

[deep geode]

Its qol though.

[tame sapphire]

not the bool the current event

its just game state comes with a players array

[deep geode]

Qhy so you want to move it to gm?

[tame sapphire]

feels like it should be there * shrugs* I think its because its setting the bool in the GS and not in the GM

[latent heart]

You could put the event on the Game Mode - or you could put the event on GS and when everybody is ready trigger a "everybody is ready" event on the GM to start the countdown or whatever.

[tame sapphire]

well it happens on every turn start and that is going to have to be GM so i think its gonna make sense if i think about it but the timer is running at the same time

[thin stratus]

Why the get PlayerState call

You already loop the player array

Just take the pointer

[hardy sluice]

Should APlayerController::AcknowledgedPawn be the same as AController::Pawn? I see (pic) that they may not be. What is the difference then? And if so, whats the AcknowledgedPawn purpose (Used in net games so client can acknowledge it possessed a specific pawn doesnt tell me much)? AController contains Pawn anyway
or is it like a callback

[tame sapphire]

still learning, but thank you

[deep geode]

Better to check where acknowledgedpawn is getting cached. I believe its a local cache. And getpawn could be referring to a previous pawn due to latency.

[magic yoke]

Following some more lovely tutorials, and I'm digging into the concept of ownership.

The tutorial said "You should run all of your client -> server code in either the player character or the player controller since those are owned by the client"

And I was stymied for an hour or so before moving the code from my character to my player controller. Is that tutorial out of date or am I missing something obvious?

[latent heart]

The character should work fine as a place to send RPCs

As long as it's spawned on the server and possessed by the player.

Any generic character or any player's character won't work.

The player state is also a valid actor.

[magic yoke]

isn't the player state owned by the server though?

[magic yoke]

can't say I understand the distinction but hey I've got lots to learn

I was using the game mode pawn that I set that's a character and is autospawned when players load in (basically example code + experimenting with stuff)

I'm gonna assume somehow that's the issue

[latent heart]

You can have 10 players on your server, but only your character will let you send RPCs.

You can't send an RPC on somebody else's character.

[magic yoke]

right

I was running dedicated server

2 clients

and calling "execute on all" to spawn a ball

inside the default pawn character you autoposess

what I'm gonna guess is I should have

run on server "make thing func" and on the server "make thing func on clients" as an echo?

the execute all code spawns the ball on all clients

[latent heart]

If you ran an 'execute on all clients' node from a client, it will execute just on that one client.

You are correct, you need to tell the server to do it for you.

[magic yoke]

when spawning stuff, only the server needs to do that right?

if we're talking about visible/interactible to all objects

[latent heart]

Yes

[pallid mesa]

and turn on replication in these objects

[magic yoke]

ye, that one I remembered at least :D

cool! I got it!

I definitely stayed up too late working on this last night and missed "only call multicast from the server"

I think I've got the logic straight now

[pallid mesa]

👏

[magic yoke]

also the tips about using HUD last night for client side UI stuff is good

anyway I'll be back in probably 20 minutes with more questions when I mess the next thing up XD thanks a ton everyone.

[vestal cobalt]

Does anyone know if Advanced Steam Session plugin is working for UE5?

[tame sapphire]

Any 1 able to recommend a basic abilty/spell for multiplayer? (Essentially the idea is to call on a specific vector that you send to the server at the start of the round the server then enacts your turn and casts the ability/spell at that location)

I know I should probably look at/into Gameplay abilities but was pretty certain somethign basic would be fine

[magic yoke]

Spawn an object at that space?

simple if you're talking about testing the code out

@latent heart I'm back :D

I'm testing spawning a custom object, and for some reason just the basic replication set up it vibrates horribly during replication

what I don't understand is that the replication settings are identical to the example classes

their moves smoothly, mine looks like it's vibrating

[latent heart]

Shrug

[magic yoke]

wish me luck then lol

[winged badger]

this turn based with a grid?

[dark edge]

It depends on what your abilities can do, and how complex they get, but I'd start with a DoAbility event and an Ability structure or class

[mighty estuary]

Where should i start with Multiplayer player basics in UE5?

[dark edge]

https://cedric-neukirchen.net/Downloads/Compendium/UE4_Network_Compendium_by_Cedric_eXi_Neukirchen.pdf

[dark edge]

Keep this in mind

[magic yoke]

yep I've read that quite a few times

[dark edge]

Another thing to keep in mind is how awesome RepNotify is

Don't multicast OpenDoor

[magic yoke]

the issue was actor spawned on server good, actor speed variable modified on server bad

[dark edge]

Repnotify on bDoorIsOpen

[dark edge]

That depends on how you're doing movement. What is doing the movement?

[magic yoke]

projectile movement in a ball

it's set to replicate

[dark edge]

IDK how replicated the stock projectile movement component is but you'd at least want to make sure everyone agrees on what its speed should be (if it's even simulating everywhere, I just made my own projectile system because I don't like the stock one.)

[magic yoke]

but it didn't update its speed when I changed it on the server

so what I did was multicast the speed update

and that fixed things

[dark edge]

Is speed a replicated variable? Remember that speed is only used for the first calculation of velocity

Speed probably wasn't a replicated variable

[magic yoke]

well, whatever it is it's all internal in the porojectile movement

not something under my control

[dark edge]

Yeah I think the stock projectile movement is pretty ass tbh

[magic yoke]

well I'm just making a funny little multiplayer game for starters

I'll just work around it for now

I did solve it though, it's been a really good example to practice

[dark edge]

For sure tho, don't use a multicast for that. Speed is a state, so use a repnotify if you must update it after spawning

[magic yoke]

I don't have the variable for speed

well, tbf it's actor velocity

I'm talking about

sorry me using the term wrong

[dark edge]

Show how you're doing what you're doing

[magic yoke]

sure

@dark edge sorry wife asked me for something

here's how I handle it currently

I'm modifying actor rotation and velocity in the multicast

no custom variables, projectile is set to replicate

[dark edge]

Show ConfigureCannonBall

[magic yoke]

this is the code that does anything, bit of dummy code after that does nada atm

[dark edge]

That's a bit spaghet, do it like this

In your cannonball, add a couple variables for all the additional stuff you want, mark them exposed on spawn and replicated if need be (not sure if they have to be)

[magic yoke]

fair, although the spaghetti would just feed into the spawn cannonball then lol

the spaghet is eteranl

eternal*

the issue is still that velocity update

there are going to be times I want to update the velocity

and it seems doing that server side only is bad

[dark edge]

Then your flow would go like
Input -> ServerFireCannon

ServerFireCannon -> Spawn Actor Cannonball (passing over the additional info in the spawn pin)

Cannonball Begin Play -> Apply the stuff

I'm not sure if projectile movement component replicates its internal state (I think it does). is the component replicated?

Make sure the cannonball and the projectile movement component on it are replicated

Leave out the randomness for now, just try adding the ships velocity so

Cannonball Begin Play -> PMC.Velocity = PMC.Velocity + ShipVelocity

[magic yoke]

component is indeed replicated

everything about the cannonball is set to replicate

[dark edge]

Is replicate movement checked on the cannonball actor?

[magic yoke]

yep

like I said

if I do my update function on the server

it still works

it just wigs out beause the clients don't think it's moving

and the server constantly reminds them it is

causing weirdness

[dark edge]

OK so set AdditionalVelocity to be replicated, and on beginplay in Cannonball

PMC.Velocity = PMC.Velocity + AdditionalVelocity

try that

Don't gate that by server btw, try just Begin play -> set pmc velocity

[magic yoke]

almost there

and that does seem to be a much better way to do it thank you

[magic yoke]

👍 I got it working

[dark edge]

Yeah IDK how the guts of the PMC work but I can't stand it using a collider vs just line tracing so I made my own.

[magic yoke]

well it doesn't seem to replicate at all

so I have to set and update everything on each client for that

which is big blug

[dark edge]

Nah it does some replication I'm pretty sure, it has all sorts of interpolation stuff

[magic yoke]

well, the velocity component doesn't*

which seems kinda important lol

thanks a lot for the info :)

[safe trench]

I just heard about playfab for the first time, is it really that good? Sound too good to be true if I undstood correctly

What I mean is, is it basically free servers for small games? And what is the downside?

I'm trying to figure out the best way to add servers to my game and I really don't have any idea 😭

Would it be better to go full playfab or just p2p? :D

[tame sapphire]

no grid but turnbased you plan a move with rest of your team and then server executes it, think simulatenous turns

[tame sapphire]

I was planning on a basic move to for now and sphere traces at locations

[limber axle]

can I create a server reliable function in a UGameInstanceSubsystem?

I'm trying to make a subsystem where you call a function from a player, and pass text.

[dark edge]

Subsystems aren't replicated (might be possible and hacky but aren't out of the box)

[limber axle]

I see

[dark edge]

I think some people are just making an actor the subsystem can route through

[limber axle]

I'm sorry, i didn't understand

I'm supposed to make a Text/Chat subsystem, but after reading and trying a lot, I'm not able to do anything from the subsystem class

[red salmon]

hard mode: Do all the servers by yourself than get an angry community that demands better queues and less ping, and in some cases these demands are almost impossible, All of this all the while you have to push out updates and pay for the damn servers.

[safe trench]

Hmm, easiest mode: give up and start making a singleplayer

[fallow shadow]

Anyone? Literally any idea?

Also how do i spawn a replicated actor again

just set bReplicated to true in the constructor?

[solar stirrup]

Speed needs to be the same on both client and server when they're playing moves

How are you changing your speed

[magic yoke]

I just ran into this issue with the default projectile movement: The velocity of projectiles is not replicated by the server in the default class

I'm not sure if it's entirely related, but I needed to adjust my velocity on clients and the server to stop making the weird rubberband/glitch by getting server/client to agree on the location of the object

[cosmic epoch]

If I want to attach one player character to another (e. g. for a grab), what's the most sane way to replicate that? Just an ordinary multicast rpc or setting the mesh component to replicated or is there some best practice here?

[winged badger]

that is extremely tricky if you can't turn off collisions for one of them, can you?

[cosmic epoch]

Yeah I would have to turn off collision and movement too in a replicated way

[winged badger]

root motion animation via gameplay tasks then

there is an option where you'd rip the skeletal mesh off one character and attach it to the other

but that turned out somewhat tricky to get right

[cosmic epoch]

What option exactly

I can't recall an option that attaches one actor to another from a root motion task

[winged badger]

its not a root motion solution

that was our attempt 1 for something similar, and we discovered gameplay tasks with root motion before we got it working

although i think it could had worked

[cosmic epoch]

I'm currently using a gameplay cue for the attachment since it reliable gets to simulated proxies, but I could also try an anim notify

[winged badger]

you'd still need a cue to replicate and trigger the anim notify here, no?

[cosmic epoch]

No, the gameplay ability montage task takes care of that

[winged badger]

we have several monsters that can throw you, drag you, pin you down or even swallow you

for all of them gameplay task driven root motion animation works just fine

[cosmic epoch]

So ure just disabling collision somehow and then have a task pin the char to the other char?

[winged badger]

we have to disable collision or someone would end up in orbit

most of our abilities that do stuff like that don't do attachments, but i think one does

[cosmic epoch]

The root motion tasks all have finite durations, so I suppose ure not needing variable duration attachments?

Or u made custom rm tasks?

[winged badger]

we have one boss monster that can drag you away

its a root motion to get the drag going

but its attachement afterwards

[cosmic epoch]

And the attachment is rpced by multicast or an anim notify?

[winged badger]

this scenario its stateful, so MC wouldn't do

replicated gameplay tag on a character

[cosmic epoch]

So ure binding a delegate to add tag

And to remove tag

[winged badger]

pretty much

[cosmic epoch]

And u somehow extrapolate to who and to which socket the player is attached from the tag?

[winged badger]

getting into relevant range, or hot joining after you did grab via MC would break for the newly relevant client

no, the monster ability is running

and its controlling the attachement

the replicated tag disables (most) player's controls

[cosmic epoch]

Yeah but how does it tell the simulated proxies that the player is attached to a particular socket of it

The boss ability isn't replicated to anyone after all

[winged badger]

the scene components replicate their attach parent

if they are replicated themselves

aside from that

[cosmic epoch]

By default? So I just have to check replicate component in my characters mesh component and I'm good?

[winged badger]

can do a FProjectReplicatedAttachement

send a socket name and a pointer to a net addressable componenet you're attaching to

if the scene component replicates, sure

[cosmic epoch]

Interesting, so if I do attach actor to actor, the skeletal mesh comp of the actor I'm attaching to must be replicated and I can do it on the server only and be good

[winged badger]

replicating the skeletal mesh is generally... not great

[cosmic epoch]

But that's the scene component with the sockets that I attach to

[winged badger]

you don't need to replicate the component you're attaching to, its part of the CDO as are its sockets

you need component you are attaching to replicate

[cosmic epoch]

But that would be my char capsule comp

[winged badger]

void AActor::OnRep_AttachmentReplication()

you might need to experiment a little, i did not write that system personally, just kept informed

[cosmic epoch]

So I just set my characters capsule component to replicate in the blueprint and I'm good?

[winged badger]

but root components of the actor will use Actor directly to replicate the attachment

/** Handles attachment replication to clients.  */
USTRUCT()
struct FRepAttachment
{
    GENERATED_BODY()

    /** Actor we are attached to, movement replication will not happen while AttachParent is non-nullptr */
    UPROPERTY()
    class AActor* AttachParent;

    /** Location offset from attach parent */
    UPROPERTY()
    FVector_NetQuantize100 LocationOffset;

    /** Scale relative to attach parent */
    UPROPERTY()
    FVector_NetQuantize100 RelativeScale3D;

    /** Rotation offset from attach parent */
    UPROPERTY()
    FRotator RotationOffset;

    /** Specific socket we are attached to */
    UPROPERTY()
    FName AttachSocket;

    /** Specific component we are attached to */
    UPROPERTY()
    class USceneComponent* AttachComponent;

    FRepAttachment()
        : AttachParent(nullptr)
        , LocationOffset(ForceInit)
        , RelativeScale3D(ForceInit)
        , RotationOffset(ForceInit)
        , AttachSocket(NAME_None)
        , AttachComponent(nullptr)
    { }
};```

you have everything you need here

[cosmic epoch]

Nice, yeah I knew about that built in stuff, so if I have my capsule comp set to replicated it should work automatically or do I need some cpp overrides of my custom character subclass

Or is there some on rep I need to expose to BP

[winged badger]

capsule doesn't need to be replicated for this to work

see ``void AActor::GatherCurrentMovement()`

[cosmic epoch]

Ok thx a lot, I'll have a look at those functions and the struct

Alas disabling collision really needs some manual rpc I guess

[winged badger]

it needs to be in the same packet that triggers the grab

so, basically, same actor channel

you don't want a replication race here

[cosmic epoch]

I see

[winged badger]

you can control the order in which variables within the actor replicate and call OnReps

or you can just do the whole thing in one go in PostNetReceive

[cosmic epoch]

Thx, I'll look into that rep struct first, gotta expose the on rep to bp

[heady python]

Im trying to make weapon firing for clients. Valorant rewinds the position on hit targets and the firing client to validate the hit. Im thinking about doing this, but Is there a better/simpler way of doing this?

[agile pendant]

Is Lan-Play multiplayer possible via blueprints on UE4?

[eternal canyon]

Wdym by is there a better way of doing this?

Like a better way of doing rewinding for shot validation?

[hollow eagle]

The simple way is to not do rollbacks at all.

[eternal canyon]

^^

[hollow eagle]

That sort of lag compensation is inherently complex to implement (and get right).

But it's also pretty much the only way to build a competitive multiplayer shooter.

[eternal canyon]

Yea def depends on the type of game