multiplayer

[lament flax]

what engine functions are responsible of spawning replicated actor from server to clients ?

[lament flax]

mh, world subsystems are initialied BEFORE the world creates a net driver

so creating the actor in world subsystem init was dumb

goodbye files, i wont miss you ||for now||

[carmine bobcat]

Hey 👋 I was wondering if anyone could help me out figuring out replication when using UCharacterMovementComponent::ApplyRootMotionSource.

From the docs, it reads to me like applying a Root Motion Source on a client (autonomous proxy) should lead to the resulting movement replicating somehow to the server, and to other simulated proxies as a result.

When I tested it out, it seems to be the case that the client would apply the root motion, but the server wouldn't, leading to the client being forced back to its original position by the server.

I also tried applying the RootMotionSource on both the client and the server, and in this case both server and client moved, but the movement on the client was choppy, which I assume is due to the positions being out of sync, so I'm not sure this is the right approach either.

I've tried digging into GAS, but I don't really understand it well enough yet to figure out how it supposedly works there.

It's hard for me to get to the bottom of what's wrong when I'm not 100% sure I understand how things are supposed to work. I can definitely share some code/videos if it helps as well.

[lament flax]

still getting an assert on server when trying to replicate a Uobject in a fast array

// fast array entry
USTRUCT()
struct FPSPrefabPropertiesObjectEntry : public FFastArraySerializerItem
{
    GENERATED_BODY()
        
        ...

    UPROPERTY()
    TObjectPtr<UPSBaseActorPrefabProperties> PropsObject;
};

// fast array container holded by replicated actor
    UPROPERTY(Replicated)
    FPSPrefabPropertiesObjectContainer PrefabPropertiesObjectContainer;

// in actor ctor
bReplicates = true;
bReplicateUsingRegisteredSubObjectList = true;

// using AddReplicatedSubObject and giving the UPSBaseActorPrefabProperties

[carmine bobcat]

Hey 👋 I was wondering if anyone could

[pseudo wagon]

Can you show your full callstack.

[lament flax]

happens in netdriver tick flush

[tardy fossil]

try setting the net.AllowClientRemapCacheObject cvar to true

setting LogNetPackageMap to verbose might give some clues

[lament flax]

thanks, will do

i already done this setup in other projects and didnt had issues, idk if i missed something or if things changed in 5.5

[tardy fossil]

oh is UPSBaseActorPrefabProperties just a UObject? is it set up properly to replicate as a subobject under an actor?

[lament flax]

yes

i override IsSupportingNet and using AddSubobjecttolist on actor

[lament flax]

how is renaming an object managed ?
for example when chaning outer on server before/after it was replicated to clients

[lament flax]

the issue was caused by the fact that the replicated uobjet outer wasnt the same as the object who was managing the subobject list

[lament flax]

so now that i fixed the issue by chaning the outer, PostReplicatedAdd is called on client when i add the entry on server, but my replicated UObject is null (which seems possible since its not atomic^), but the PostReplicatedChange is never called wit ha valid pointer

i tried using atomicity with NetSerialize but when its called on client the UObject is also null

okay, tested with a simple property and its reped

so its an issue on the fast array

[gilded vapor]

I had similar issues with root motion montages, I fixed this before passing the current animation playback info in FSavedMoves in the CMC and updating montage playback on the server as they come in

[verbal dust]

Im having an issue with playing a landing animation on server side. I think it might be the on Notify end triggering immediatley instead of when the notify ends but im not sure

Theres a bit of delay on client side too. I had it set up to trigger the montage client side and server side but im doing it server side only now to figure out whats going on

[lament flax]

tried more stuff, if i reuse this actor member replicated property i dont get the OnRep called on client, so it doesnt seem to be linked to the fast array but an issue linked to the fact the object im assigning was an instanced object from another not replicated actor component

so could be because i changed outer before reping (but its not the same compared to the loaded object)

tried to duplicate the object with StaticDuplicateObjectEx and replicate as subobject the result, but not working

[small wraith]

Heyo, I have a question.
I want to make a game that has a multiplayer option with identical gameplay to the single player one, but I know multiplayer is miserable in Unreal, replication, rpc, authority and whatnot.

Realistically, how feasible is it to start the project single player only and then eventually turn it into multiplayer? I am assuming it would be borderline miserable because the logic is vastly different but I'd be curious to know if it can be done, just to speed up the prototyping / early stage of the game

I know at least it's possible in Godot, I've seen Buckshot Roulette turned to MP a good year after its releaae

[fossil spoke]

but I know multiplayer is miserable in Unreal, replication, rpc, authority and whatnot. that makes no sense. Unreal is by far the easiest and user friendly engine to implement multiplayer in...

[fossil spoke]

You do not want to start a game as SP and then later on move it to MP.

You EITHER make a SP game and sell it as SP, OR you make a MP game and sell it as that.

You dont just casually convert a SP game into MP.

You may as well just rewrite the whole thing.

Its much easier to make a MP game into a SP experience than it is the other way around.

[small wraith]

So if I want a game that has sp + mp I have to program it like an mp and sp is just a fake mp with no server?

[fossil spoke]

Yes, essentially.

The SP experience would just be like running a Listen Server.

[small wraith]

That's just awful

[fossil spoke]

Why?

[small wraith]

Everything takes 10x to debug, things like hud and screen interaction (clicking on things etc.) is finnicky, not to mention syncing anims etc
I know because I have done it, I have a project like that and I literally gave up because of the endless chase of bugs with rpcs, rep notifies and whatnot

[fossil spoke]

Then dont make a MP game...

If you find that stuff to much to deal with, just make SP experiences.

[small wraith]

It's miserable regardless of how much you gaslight me, and anyone will agree on that

But regardless I got my question answered

[fossil spoke]

🤦‍♂️

[bleak hornet]

so i have server portion for playfab set up, but i dont fully understand how to finish the client side, and on top of the my game isnt packing for some reason

[fossil spoke]

The packaging process will tell you in the logs why it failed.

[bleak hornet]

its throwing up an error code and crashing UE

Assertion failed: (!FPlatformProcess::SupportsMultithreading()) || (!bIsRunning) [File:A:\UnrealEngine\Engine\Source\Runtime\Core\Private\Misc\MonitoredProcess.cpp] [Line: 108]

ive restarted unreal, and my pc

just got it again

its something to do with turnkey as it wont let me install sdk for windows

[dark parcel]

I don't agree with this statement, can you find any other Game Engine where it's easier to implement multiplayer?

MP game can be played as SP but not vice versa because both are architecturally different.

Doing multiplayer as not a seasoned developer is miserable to begin with. And depending on the type of the game it gets a lot harder (e.g real time / turn based).

If one never release a single player game, I wouldn't jump to MP.
You will be miserable trying to figure out OOP when there are multiple instances.

[verbal ice]

Buckshot Roulette also isn't a good example of SP -> MP. It's a very simple game to program, so if you were to make it in Unreal in single player, and then port to MP, it also wouldn't be too long

But honestly having toyed with different networking solutions in Unity, Unreal takes the crown for the best networking atm

[dark parcel]

That sounds like just a single game mechanic, wouldn't be too long to re-work the entire thing.

[bleak hornet]

isnt it that if you wanted MP, you start implementing MP before the rest of the game?

[verbal ice]

You'd implement your game with multiplayer in mind

Anything short of a tiny game is going to pretty much need a lot of rewriting to port from SP to MP

[dark parcel]

Yeah, you don't want to turn single player into mp game, in many casses it's not even possible and require entire re-work.

[bleak hornet]

yeah i understand

alright, so its whenever i try to check, it crashes unreal

when i click refresh platform status

[dark parcel]

that's just reality?

[small wraith]

It's funny how you spiraled instantly from
you know nothing about mp -> you have never shipped a sp game -> you have never used oop before

The gaslighting is crazy

And then the guy below you contradicts your claims by saying buckshot is easy when it's a turn based game

[dark parcel]

Roullete is a single game mechanic

you can just re-do that from scratch

[verbal ice]

Buckshot is stupidly easy to program, it's the art that probably took the longest

[dark parcel]

You are just wrong when you said Unreal is miserable and difficult to implement multiplayer when infact it's one of the easiest Engine to implement multiplayer out of the box.

[verbal ice]

There's a lot of learning for Unreal's multiplayer sure

Doesn't make it bad though

[small wraith]

you're talking about the 1v1 sp, which yes it is
Now try the 4 player version, especially with the unreal mp context

[dark parcel]

Or just multiplayer in general, even in other engine they would use RPCs too. I don't think it's done differently.

[verbal ice]

Yeah gimme a few hours and it's done? No assets, just gameplay

[manic bluff]

Big agree, the way that Unreal handles multiplayer made it 10x easier for me to learn. It's got some quirks and things that you need to understand, but so does literally every game engine when it comes to multiplayer. If you're looking for the shortest and easiest* route, then it's Unreal

[bleak hornet]

so i read on forums that i need to reverify my UE files, but i havent found an exact method to do so for the source version

[small wraith]

lol, try it I'd be curious

[verbal ice]

If you make Buckshot with multiplayer in mind, it's literally the same as a 1v1 or 1vX

Joins channel full of multiplayer devs
Gets told how you learn how it works and it's really good
Gaslighting
Like, come on

[dark parcel]

literary that, 1v1 or 1v4 or 1v9 makes no difference

the moment it's networked, the logic is just different.

[small wraith]

I await your few hours unreal mp buckshot

[dark parcel]

no one needs to do your homework

[verbal ice]

I'm not wasting time for some random discord user that calls "gaslighting" the second someone says something they don't like

[small wraith]

I'd be impressed if you even get the players spawned

[dark parcel]

lmao

[manic bluff]

holy

[small wraith]

lol, I accept your concession

[dark parcel]

this gotta be a troll

[verbal ice]

Cat is that you

[manic bluff]

players spawning literally works right out the box with unreal multiplayer, just saying

[small wraith]

Yeah I'm a troll, whatever
Go make 64player bf6 in blueprints prodigy, y'all so full of yourself is unreal

[verbal ice]

Worked on a 100 player game but sure, can do 64

[small wraith]

Circlejerk among yourself, throwaway accounts ftw

[verbal ice]

Bwahahahahaha

[dark parcel]

you won't get far in life with that attitude

[verbal ice]

Don't feed the troll

We'll get in trouble

[verbal ice]

me when PC->RestartPlayer() takes hours to write

[manic bluff]

so difficult man

[verbal ice]

I don't get why you'd join a server to ask questions to people with (probably) more experience than you and then start flipping out

What's the point

[manic bluff]

bro literally went sicko mode 3 messages in, like what

anyway i got my entertainment for the night

[dark parcel]

This gets confusing, why does all my A.I returns true on IsLocallyControlled?

if (PawnOwner->IsLocallyControlled())
{
    PrimaryComponentTick.SetTickFunctionEnable(true);
}

I guess A.I controller counts as well not just PlayerController

[verbal ice]

On the server?

[dark parcel]

well A.I controller only exist on the server

[verbal ice]

guessing it is locally controlled by the server

in a sense

[dark parcel]

yeah

if (PawnOwner->IsLocallyControlled() && Cast<APlayerController>(PawnOwner->GetController()))
            {
                PrimaryComponentTick.SetTickFunctionEnable(true);
            }

throwing extra check, hopefully does the trick

aww damn, the character isn't possesed yet by the player controller by the time the ActorComponent begin play gets called.

[quasi tide]

Awww - I'm surprised no one pinged me when they brought up Godot to try and compare 😅

[thin stratus]

Yeah BeginPlay is usually too early for that stuff

[meager aurora]

Hi, what would you recommend for handling frequently changing replicated variables. In my enemy ai properties like gait are changed quite frequently depending on circumstances and sometimes the changes are picked up sometimes not.

[tardy fossil]

MP in unreal is only miserable if you dunno what you're doing

oh whoops i was scrolled up

[fossil spoke]

What is your concern exactly?

[dark edge]

Why would gait be replicated? It should be derived from velocity on all machines

[nova wasp]

having a secondary value to describe the context behind the velocity isn't that weird

it's not just a ball rolling around

[dark edge]

But if that value is derived from velocity to begin with then what's the point?

[nova wasp]

sure, if it can be derived from other values it is redundant

[meager aurora]

Seems like my issue was fixed by REPNOTIFY_Always

[proven pagoda]

Am I stupid here? I'm not used to doing multiplayer in blueprints, but I simply want to destroy this actor and this works for the server but not the client. In C++ I just call a server destroy and it works for my projectiles but this thing doesn't on clients

The breakpoint hits it just fine on the client

[nova wasp]

who spawns the projectile?

[proven pagoda]

the projectile ability class spawns the projectile and sends it off

[nova wasp]

I am not really concerned about GAS or whatnot here, I am asking if it is spawned on the client or the server

[proven pagoda]

Server spawns it then

just like the server spawns this item class

[nova wasp]

does the rpc just not reach the server?

[proven pagoda]

Correct

[nova wasp]

it might not reach the server if the server has already destroyed it on their side

"this works for the server but not the client" does not really describe what isn't working

[proven pagoda]

I put a breakpoint on the Destroy Actor function and the breakpoint does not stop on it

I made another event similar to this and just put a print string for hello and that also does not print string

I'm not familiar with multiplayer in blueprints is there some setting I'm missing perhaps

[nova wasp]

ah, I forgot

multiplayer in blueprints is not any different from C++ in reality except for being extremely limited and onreps also running on the authority

does the client own this actor?

client->server rpcs must be from something the client owns

generally their player controller or possessed pawn

[proven pagoda]

Nothing owns this actor

owner is nullptr

[nova wasp]

might be time to read the docs on multiplayer rpcs

clients can only send rpcs on things they own

you can make a new rpc that includes this item as a parameter of the rpc (but as an rpc on something they own)

[proven pagoda]

Ok but the rpc is being sent from the actor itself to itself

[nova wasp]

read what I said again

when I mean "they" I mean the client themself here if that was too ambiguous

so for example the client must send rpcs from their player controller, pawn etc

[proven pagoda]

I have the player controller inside this item actor

[nova wasp]

sure

[proven pagoda]

I can just pass the item pointer as a param and call destroy from inside my player controller that's interesting

[nova wasp]

yep, that should do it

this is a very frustrating aspect of multiplayer but you can help spread the code out with actor components

you can add new controller components etc

to serve as places to add new rpcs

[proven pagoda]

Well I also have the inventory component from the player controller inside this actor as well

I could pass it back into the inventory and do it when I pick up the item

[nova wasp]

that should work as long as it's a replicated actor component

[proven pagoda]

Hmm

It is replicated

I've never run into this before in multiplayer I'm sorry this is weird I have done so many other things multiplayer and why have I not run into this before

[nova wasp]

one not so great part of this is that other players will never see this inventory

as it is on the player controller

which only exists between the client and authority

[proven pagoda]

Yeah that's true, but now I can drop items from player to player

I'm close to player trading

[nova wasp]

probably because most gameplay code tends to live on the pawn/playerstate/playercontroller etc

[proven pagoda]

That's where most of my replication is handled if I look at this project really

I didn't put that together

hmmm

[nova wasp]

I personally am not a fan of the fact it silently fails I guess

like at least in the editor it should just go "lol no" and error log when reading the bunch

instead of silently not sending/rejecting

(not your code, the way this works in the engine)

[proven pagoda]

That would be nice

if it would say

hey this didn't send

Bro you're a godsend

Put it like this in the component

[nova wasp]

pointless trivia: you actually can keep an object alive the server has destroyed through some ways

not sure if it's possible in bp

to TearOff etc

[proven pagoda]

Back in here just pass this

lmao my C++ was old code

With the new item destroy

[dark parcel]

PC is the wrong place if the items need to be known by other players.

player state is replicated to all, so that's a better candidate.

[proven pagoda]

The item isn't inside the player controller

It just exists in the world

and is replicated out to them

[nova wasp]

yeah, but when they pick it up it might be interesting for other players to see how many health kits their teammates have or something

but if you never need that it's fine to hide it

[proven pagoda]

mmm I'm making an RPG I'm not really looking to share inventory info with other people

[nova wasp]

one thing you can do is have a separate COND_SimulatedOnly replicated thing just for simulated proxies that only need to know about some things and not others

[dark parcel]

So you can't look into some other player profile and check what their equipping?

[nova wasp]

most MMOs I play let you inspect other people

[proven pagoda]

Ok but my equipment list is different than my inventory list

so why replicate the entire inventory to inspect equipment

[nova wasp]

okay, if that's something else then I guess it's already done

I kinda though they would be the same thing I guess

[proven pagoda]

They communicate sure but no they're independent

[dark parcel]

just keep in mind that client only have their own PC.

[proven pagoda]

I understand

I made a leaderboard system for a MOBA once that I displayed live update all players in arena 4 clients what everyone was equipping and unequipping as they bought from shop and gained consumables etc

I couldn't do anything with the player controller in it

Well actually lmao I collected all player controllers if I look at it and use them in the system

what am I doing bro

yikes

[dark parcel]

Team's score = Game State

player's individual score = Player state

[proven pagoda]

Who said anything about score

I'm talking inventory and items equipping and unequipping

[dark parcel]

well you are talking about leaderboard

[proven pagoda]

Ok well I never got to the player score for them they only asked for the items and the GAS stuff really

I had to hook it up to everyone's ASC and read it etc

[dark parcel]

unrelated to this convo but I seen enough bad youtube tutorials.

[proven pagoda]

then someone else took it didn't they

[dark parcel]

like Matt Aspald place HP in player controller.

[proven pagoda]

I tried watching them but I can't take them seriously

I'm not the best I know I'm not

but there's just things that are genuinely what the fk

Pass the item around a little

[proven pagoda]

I've been staring at this for a minute and I understand this differently than I did about an hour ago. Thanks

This item is irrelevant, but the concept is the same. My Equipment Component just handles the currently equipped pieces while my inventory holds the info about all the equipment the player is carrying that's not equipped, but in the end both of them are on the player controller. If I wanted someone else to inspect me and see my equipment, I will need to move that off the player controller to the player state instead, which would be fine I could handle the swap just fine. I was so focused on the specifics that it was this item I missed the bigger picture

[frosty helm]

Is it a good approach to have a state tree only play on the server and then replicate the visuals of the state it is in to the clients?

So that the logic is executed on the server, but the particles and animations are played on the clients?

[fallen fossil]

Can subsytems use any rpc? Or all of them are local? 🤔

[junior timber]

Trying multiplayer for first time.
I have a widget with textbox and when you type a text and do enter.. It sends an interface to an Actor "WordManager"

The above is simple setup I did to debug a issue.
The variable current word changes in server and clients if I do in server.

But when I do enter in clients. Only it changes in clients. Even though I have set it to run on server

[fallen fossil]

I am thinking in terms of loading game.
How does it work.
If client has some object(game system or some actor component) that holds quests info or just his action history, I would like this to work after loading game / joining multi

[fallen fossil]

Is this screen from actor or widget?

[junior timber]

from actor.

if I type a word in client. It is only doing for client
but if I type a word in server, it works for all

[fallen fossil]

Actor must be owned by client ( something that is owned by thay client in chain) to be allowed to send info to server

[junior timber]

it is just a simple blueprint actor that I have placed in level.
Wouldn't that mean it creates each instance of that actor? do I have to set up manually for the actor to be owned?

I just searched chatgpt.. I'll try to understand it/ Thank you

[humble idol]

You're setting CurrentTypedWord locally, sending that value into the server, and then calling a multicast to set CurrentTypedWord to that value on the other clients. You're not not setting it on the server. The only reason it's being set on the server, is when you're playing locally as the server (listenserver).

[fallen fossil]

try testing in Player Pawn, it is usually owned and spawned with proper owner.

Or just spawn on server with proper ovner

[fallen fossil]

https://youtu.be/OVeo3cVTIcU?si=vtnvjT-OfeQ4yxXP&t=392

[junior timber]

Did watch this to understand the concept. Still confusing.

[junior timber]

Wouldn't multicast set it on server too?

[humble idol]

Okay, yeah, you're correct about that. If it's a ListenServer, it's considered a client and also applies.

[junior timber]

This is literally the only setup I have done.
I am using actor blueprint... As mentioned before the server only owns this actor...
So maybe that is something I need to check

[fallen fossil]

if server owns actor

then client can not use it to send data to server

[junior timber]

Yes, wordmanager is calling the RPC.

[junior timber]

ok, will need to check into it

[fallen fossil]

https://youtu.be/JOJP0CvpB8w?si=NwzEHBySBgPsYgRP&t=313

this explains more in detail

[junior timber]

Yeah, I also watched this video.

[fallen fossil]

6:10 is ownership

[shut vigil]

Hello i just have a quick question

Correct me if im wrong

Get actors of class affects all actors of that class. for example if i subtracted money from using get actors of class it would subtract money from all of the actors right? and if I subtraced money using a cast node then it would only remove money from that single instance of the actor right?

[fluid prawn]

Quick PlayerState Connecting/Disconnecting wanna make sure its not hersay. But Tracking Player State and Seeding it during PostLogin and removing the player state on disconnect is the correct way?

[junior timber]

get all actors of class will give you an array of that actor in your level.
Get actor of class will only give the first actor of that class in your level.

I think you will need to loop for get all actor of class but also that money variable should be instance variable so that each can have different numbers

[shut vigil]

okay so then, i used get actor of class, and when using a widget it set that widgetr for all of the actors.

[junior timber]

get actor of class will only give you first actor only..
If you have multiple same actors in level... it will not give you all..

it will only do the effect for the first actor

for get actor of all class, it will get all actors and then you need to use for each loop

[shut vigil]

AAAAHH

[junior timber]

I realized I am in multiplayer tab here..
not sure about multiplayer and what your trying to do

[shut vigil]

oops caps lock

nah i get it now

[shut vigil]

so if i wanted a variable to update for every player, i would do a get all actors of class and then do a loop so it applies to every player

[junior timber]

You have to use RPC to update variable for server and clients

[shut vigil]

RPC what does that stand for?

[shut vigil]

what does rpc stand for?

[shut vigil]

No you dont

[frosty helm]

How do I set a variable in my animation blueprint on all the clients from an ability task? I want to set my IsAlive bool to false.

Setting the variable from the ability just sets the variable for the server, but I want it to replicate and also set the variable on all the clients as well.

If I try to make a custom event with multicast inside my gameplay ability I get this error.

[dark edge]

If you're in GAS land shouldn't that be a tag?

[frosty helm]

I suppose I could do that in this specific scenario, but what if I needed to send a float, how can I send that value to all the clients from an ability?

[shut vigil]

Hi I am having an issue. I am reprograming some of my code. Specifically picking up items and how that works on multiplayer. I have an even that runs on server that adds a component to the player. But it is not adding the component when doing this on the client player

it only works on the server player

using mutlicast does not fix anything

and making the event that adds the component run on multicast and then callign that event on the sever dfoesnt fgix it as well

So basically

The server player can pick it up just fine

but the client isn't properly

even thought It should

[dark parcel]

Don't do this, RPC is for a one time event. If you need variable to be sync, mark the variable as replicated.

[dark parcel]

Is the component marked as replicated?

Iirc theres a gotcha when it comes to run time component.

[dark parcel]

There can be only one owner at the time so if there are more than one client need to call server rpc, this is not viable.

The workaround is to route the rpc to replicated component that the client own.

You can create a component that is attached to your character or controller then route the rpc there.

[junior timber]

Yeah, I watched more than 10 videos to understand this. Found a video that explained it clearly..
Basically, the actor is owned by server. So client cannot call server event on it unless owner changed.

I'll do this in playercontroller.

[dark parcel]

You should look at the pinned material in this channel.

Exi multiplayer compedium and wizard tips and trick are gold mine.

[finite kernel]

That or have a dedicated proxy actor relevant for this system

its basically use playercontroller or existing actor as proxy making it massive monolithic mess after some time

or have dedicated proxy actor for each system for tidy code

In iris a lot of actors are of no issue

legacy system nope

[dark parcel]

Well you can turn it into actor component where you can attach it to the pc or character. That way the pc or the character isnt convoluted

[finite kernel]

yes you dont necesarily need to use actor as the proxy, component works just aswell

[shut vigil]

I will have to double check that in a bit I am not home

I will ping you when I get back @dark parcel

[junior timber]

Thanks for help. I was able to reroute the message from my widget textbox --> playercontroller ---> actor
as playercontroller is always owned by player

[dark parcel]

@junior timber another thing to note is that client only have their own PC.

So if you need to do multicast, that's not the place

As client 2 does not have a copy of client 1 PC and vice versa.

[junior timber]

Yeah, first run on server --> then multicast

[dark parcel]

If you need to do MC then attach to your character not player controller.

[dark parcel]

If that's whats required dont use Player controller.

A multicast from the server will only land on the client"s server copy and the client that own it, since client doesn't have a copy of other client player controller.

Check our wizard multiplayer tips and trick pinned in this channel.

You will get bug 100% if you play with 2 clients or more.

[shut vigil]

@dark parcel

The component is set to replicate and this is what the code looks like

The Server player gets the component added to them completely normally

the client prints the "Added string but does not seems to have the component

[shut vigil]

@dark parcel (sorry for the ping) I put a print string right after the Add BP Flashlight Component and the Client doesnt even print that string

Okay so another update

If i make a on server event in my player blueprint and then call THAT in the actor it gives the client the component

[junior timber]

https://youtu.be/BJh_R2zCCdk

I watched this 3 part series and it explains a bit better regarding replication.
ownership of actor and all

[shut vigil]

so i can't properly replicate giving adding a component when its not in the player blueprint?

[shut vigil]

Correct me if I'm wrong

but from what i am understand is

the reason why it is not working on the client is because the actor i was using to call the server event doesnt own the compononet

[dark parcel]

This is not a component. An actor component is not an actor.

An actor component is a component you attach to actor.

You need to create a new blueprint that derived from actor component.

[shut vigil]

wait okay so

wait

Ok so

[dark parcel]

Well wait a moment i didnt know it was for a flashlight

[shut vigil]

oh okay

Well basically what I want to do is

I have actor that I place on the ground and when the player stands in it they can press F to add a component to them

but it works on the server player but not hte client

[dark parcel]

Well there seems to be misunderstanding on whats component and what nit

[shut vigil]

okay so

This is the actor

This is the component

the component just handles turning on and off a light that is attached to the player

[dark parcel]

Yes because client cannot send rpc when they dont have ownership of the actor

Surely you follow this far?

[shut vigil]

Okay i guess that makes sense

then how come the server player can do it?

[dark parcel]

Because server is authority

[shut vigil]

And then how come the exact code that wasnt working in the actor works fine for the client player when its in the player blueprint

[dark parcel]

Because the player is possessed by the client ! It is owned by the client.

[shut vigil]

oooooooooh

[dark parcel]

2 things owned by the client out of the box.

The player controller

And the player character

[shut vigil]

So the reason why it works only in the player blueprint is because the player is owned by the client but the actor isnt owned by the client?

[dark parcel]

Look into the pinned material in this channel for faster learning. It is compiled beautifuly already.

[dark parcel]

Yes the pre placed actor in the level belong to no player.

[nocturne quail]

and the PC in which the game is running 🤣 , so 3 items owned by the client

[dark parcel]

Only server can call rpc on it.

[shut vigil]

Okay that makes sense

and there is no way to make it where calling the event in the actor will give it to the client?

[dark parcel]

Lets not confuse anyone

[dark parcel]

There's a way to call rpc as client. That is by telling the server to give ownership to a specific client.

[shut vigil]

there's a node for that right? I cant remember what its called

[dark parcel]

This isnt in anyway recommended, arguably terrible infact.

The solution has been given above.

Route the rpc to something your client own.

[shut vigil]

so i should just handle the game logic for adding components in the player blueprint and call that event in the actor to make more simple?

[dark parcel]

You route rpc to something the client own. To not convolute youe character we can encapsulate in actor component.

[shut vigil]

but woulldnt it be easier to just make an event like this in the player blueprint and then call this event in the actor?

This works completely fine

(Item ID is used in the animation blueprint to change animations)

The actor already has to cast to the player to change a text blip that says what item you're standing on

[dark parcel]

Works because the character is owned by the client so the client can send server rpc.

[shut vigil]

I know

[dark parcel]

Thats exactly what i mean by routing the rpc

[shut vigil]

Ah

Okay

[dark parcel]

But at this point you are convuluting your player character

[shut vigil]

How so?

[dark parcel]

Now is just your flahslight

As the game progress will you dump thousanda of code to the character?

The character isnt responsible for all those logic.

Wycd is wrap the logic inside the actor component then attach it to your character.

[shut vigil]

Well in this case the only thing the character would be responsible is having an event that is called in an actor to give a component

thats it

The component handles the logic of turning on and off the flashlight

how is that convoluting things?

Im asking cuz Im not great at unreal engine and I wanna learn

[dark parcel]

The player character shouldn't be responsible to turn flash light on and off.

That should be handled by the flashlight

Neither it should manage interaction

[shut vigil]

The character isn't responsible to turn the flash light on and off I just said that

[dark parcel]

Even when those feature are taken out the character should still work.

You can do a better design by separating responsibility by encapsulating.

[shut vigil]

okay but you're missing what i am saying

The character isnt handling turning on and off the flashlight

A component is

[dark parcel]

Im just trying to help not argue, if you dont want to use actor component. That is your choice.

[shut vigil]

The only thing, that the character would be handling in this case scenario is holding an event that is called somewhere else

thats it

Allof the flashlight logic with the light is handled in a static mesh component that is added to the player

[dark parcel]

Sure and that's not how I will approach my project.

Character should handle character logic, nothing else.

[shut vigil]

Well it kinda is character logic

Adding components and all that

[dark parcel]

Interaction is on its own, equipment is on its own, inventory at its own, etc.

[shut vigil]

is having the add component event in the character blueprint then having that event called in another actor unoptimized?

Like will it cause performance issues?

[dark parcel]

Its not about performance

Im not gonna have give me flashlight event in my character bp.

Open door event in my character bp.

Start elevator event in my character bp. And so on. You get the idea.

Even if the door were to dissapear from my project I want my character to still work as is.

Character shouldn't even know about any flashlight or door.

[nocturne quail]

you should have an interaction component for interactable items, give this component to any interactable item and bind to an event in character oninteract, then see if item was a flashlight, on/off... if it was as vehicle in/out.. if it was a door open/close

even if it was a pickup item, add to inventory

[meager spade]

How is that mp?

[nocturne vault]

Woops! I mistaked it for materials

[meager spade]

Np

[dark edge]

still a GameplayEffect

What specific float are you talking about here

[random flicker]

Hello guys,

I am fighting heavily with UE repilication and seems like it winning.
I have a dumb Character to spawn literally empty.
This under MGF attached to the GameState and the Character is not geting replicated...
I've tried everything GenAI recommended as seems like impossible to fix

[dark edge]

Have you looked at the character the engine gives you with a C++ character template?

[fossil spoke]

What exactly isnt replicated?

Also the cull distance is irrelevant if the Actor is marked as AlwaysRelevant.

[random flicker]

So I am using outliner to see if atleast Character appears on the client - nothing there, but on the server I can clearly see a character

[random flicker]

let me AI that.. not sure how do that

[dark edge]

don't

make a C++ template project

and look at the code

[fossil spoke]

Ignore the outliner, put a print string in BeginPlay of the Character.

Or better yet, create a Blueprint of the Character so it has a visual component

Spawn that instead

So you can visually see it

Its very likely there, you just arent seeing it because by default it has no visual representation.

[random flicker]

nope, nothing there... werid.

will try to spawn BP

[fossil spoke]

What do you mean nothing?

It doesnt print?

It prints once?

It prints twice?

[random flicker]

no UE_Log printed on BeginPlay

[fossil spoke]

It doesnt print anything?

Not even for the Server?

You are running a Listen Server + 1 Client correct?

[random flicker]

yes. On even on server, however the server breakpoint is triggered.
Yes, listen server + 1 client

I've cached it and now prints log in begin play once

by cached I mean have a uprop and store ref

[dark parcel]

Whats actor rep suppose to represent here?

[random flicker]

just to store refence, nothing else

[dark parcel]

And your issue that its null? And on whom? The server or the client?

[random flicker]

the ActorRep is not replicated to the client

[dark parcel]

Yeah the ptr is not marked as replicated.

Setting it on server will do just that. It will not attempt to replicate the value to client unless the property is replicated ( which isnt in your case )

You will have to mark it as replicated and use RepNotify if you want callback when the client value changes.

The ptr not replicated aside. if you spawn a replicated actor on server, client will eventually get a copy.

[random flicker]

as far as I know you don't need to that for the Character it's automatically replicated

[dark parcel]

Sure but the ptr is not replicated

So dont expect the value to be changed on other machines but the one that sets it.

[random flicker]

yea, the problem is that character is not replicated. proprerty was a tweak to have something working

[dark parcel]

And how do you check if its not replicated?

Do you have something to represent its visual so u can actually see if clients getting copies?

Because your screen shoot of trying to cache the ptr isnt doing much since the ptr is not replicated.

[blazing bear]

does anyone know if the condition in DOREPLIFETIME_CONDITION of a specific variable can be overriden in a child class? Like having COND_None in the parent class, and COND_OwnerOnly in its child.

[fossil spoke]

You can.

With an active override

[blazing bear]

Ooo thank youu

[fossil spoke]

RESET_REPLIFETIME_CONDITION

[blazing bear]

Not DOREPLIFETIME_ACTIVE_OVERRIDE ?

[fossil spoke]

No, that was the wrong one sorry.

[blazing bear]

Oh okay, thankss!

[ashen plume]

As a higher level system question, how do games handle responsive item pickup without causing duplication issues? Not sure how survival crafting games do it.

Something like counter strike i think just waits for validation during the pickup anim before allowing firing.

[dark parcel]

I would just wait for the server to respond, so delay is a given.

There is more headache with predicting pickup.

What if someone else actually got the item before you?

Do you want to handle taking the candy from the player that think it picked up the item but in reality it didnt?

[fossil spoke]

Depends somewhat on the type of system it is.

Sometimes you can "hide" latency and server validation behind animations and other cosmetics

So like, if you have to visually "put down" an existing item before the new one is picked up.

You can hide the delay of server validation behind the put down of the existing item.

So by the time you have to visually switch, you will know if it was successful or not.

Sometimes, there just isn't a lot you can do about latency and waiting for the server to confirm your actions.

Its all about tradeoffs.

Sometimes miss predictions are ok

Depends on the game, depends on the system.

[lament flax]

so when you have an actor/actor component that doesnt update variables regularly, i can simple set it to dormant, then when i want to update a variable, i wake it up then update the var (using push model) ?

how does dormancy work ? is it replicated to clients from server ?

[kindred widget]

AFAIK you don't even need to change it's dormancy. A simple FlushNetDormancy call will make it replicate once and then go back to dormant.

[lament flax]

so when its dormant, i can change a variable on server then call FlushNetDormancy, this will wake it up, rep var, then make it dormant agin ?

[kindred widget]

I think so. That's how we're using it as far as I understand.

@meager spade can probably comment more clearly on it, he's the multiplayer wizard.

[meager spade]

yes

FlushNetDormancy does exactly this

[lament flax]

okay

does dormancy affect RPCs ?

what happens if a dormant server or client actor tries to RPC to the client/server

also, when using DORM_Initial, does it at least rep once before going dormant ?

[meager spade]

dormant stops actor channel

so server/client rpcs dont work

only multicast

[meager spade]

yes

[lament flax]

how do you guys use push model for BP

did you exposed a helper static func ?

[noble arch]

Heyyyy guys!
I need some help to think about the architecture of some stuff. I'm doing a mmo RPG like just to gain some XP, but here's my question;
Usually what I do for interactables is that they have a SphereComponent and whenever the players overlap with it, the interactable is removed from its sleeping state so the player can interact with (adding itself to a list of nearby interactable on the player).
But then my best friend ChatGPT told me that it would be better if only the player has a SphereComponent that scan's every few frames for nearby interactables, avoiding too many interactables with sphere collision in the world. It kinda makes sense, but is that the real - best approach ?
Then do I have the player to scan for interactables, but also for ennemies (to show their nameplate for instance)

Can all that be locally ? Or the server needs to control those overlaps ?

[exotic wasp]

wdym?

if it's a c++ property, just use a setter

if it's just bp, I think it's setter handles it

[lament flax]

kay

but im referring to pure BPs

someone makes a BP, add vars and set them to replicate

[exotic wasp]

there's an engine var

[meager spade]

there is a helper

though i think pure bp props

does this automatically

but not sure

we have very limited replicated bp props

[rigid smelt]

Does anyone know why does the client movement look like that on the listen server? Server moves ok the the client side, client moves ok on the client side. Can that be fixed? If I run 2 clients works just fine on each other, just client on server moves choppy

[exotic wasp]

maybe im blind but I don't see a difference

which one is which?

[quiet sentinel]

Same here 😂

[rigid smelt]

left server, client right. when right moves the client instance on the server is choppy af like 24-30fps

other way works just fine

is the server tick rate 60 and that's the reason? as client runs with more fps? but then even so why the server side server moves properly, because it's locally simulated?

[quartz iris]

Trying to make a planks break on a barricaded door for clients as it only seems to work on the server, what's going wrong here?

[quartz iris]

other half of this code

[fathom wadi]

Is there a way to disable Tranform replication when server changes the transform of StaticMeshComponent?

[opal gyro]

Hey all, I'm trying to debug a UObject that I create on the server being null on the client even though I think I have the replication setup correct according to the docs. If someone is willing to step through the flow with me in a call and help me out I'd really appreciate it.

I'd send pics in here but that would be a LOT of spam

[finite kernel]

fast question, is there any limit to ustruct inheritance depth when the ustruct is used as a replicated property?

[random flicker]

Thanks for helping 🙏
I’ve used the outliner to see if actual character is spawned, added logs, break points even tried to cache

[errant charm]

Are you sure the plank actor is set to replicated?

[shut vigil]

how can I make it where the client can interact with code that it dosent own?

[exotic wasp]

evil

[shut vigil]

well like

I have a door that I want all players to be able to open

Would i have to cast to that door so I can rout it through the client?

[opal gyro]

How are you doing interaction?

[shut vigil]

Blue Print Interface

[opal gyro]

Well if your interaction is triggered on the server (as it should be) you can set a replicated IsOpen bool or something and open the door when that value changes OnRep

[kindred widget]

Your recording doesn't really show it, likely due to similar FPS as the client updates on the server. But this is a common issue with listenservers and autonomous proxies. The primary issue is that server only ticks animation poses when a client sends new input data. So the animations only update every couple of frames when new data comes from the client. There are some work arounds, you'll have to research them, but from memory they're not that great unless people have found better ones. One was doing some override in CMC that makes the pose tick every frame, but I recall it had some issues.

[shut vigil]

huh?

[exotic wasp]

if your interaction is happening on the server, ownership doesn't matter

[shut vigil]

well

[quasi tide]

Do a server RPC in something that the player owns. In the RPC, pass the object reference that you are trying to interact with. Then on the server, do the normal interface call.

[shut vigil]

it doesnt work on the client @exotic wasp

[exotic wasp]

do what duroxx said

[shut vigil]

should I do that by casting?

[quasi tide]

No

[shut vigil]

okay so

then how

[quasi tide]

Seeing how you are relying on interfaces, on your linetrace, overlap check, or w/e - check if it implements the interact interface

[exotic wasp]

in this case you could have your interaction be a server rpc

[quasi tide]

If it does, then just send the actor reference itself

[shut vigil]

thers no linetrace

[quasi tide]

I don't care

That's why I said "or w/e"

I don't care how you're getting the actor reference, you do

[shut vigil]

server rpc is executes on server right?

[quasi tide]

But it doesn't matter for the purpose of this process

[exotic wasp]

yeah

[shut vigil]

okay so

[quasi tide]

The client will just check that the actor reference implements the interface. If it does, do the server rpc and pass the actor reference. Then the server will just call the interface.

Now, this is where you can implement some server side checks if you'd like

[shut vigil]

I could call an event in the server in the player blueprint and than have that event called in the bluepriunt for the actor?

[opal gyro]

You should be calling "Interact" in your player or whatever on the server

[shut vigil]

oh shit wait

[opal gyro]

and then you know any interaction stuff in your door is happening on the server

And if you want your stuff to be replicated to everyone, it needs to be in a multicast

[blazing spruce]

Dont use multicast use OnRep

[opal gyro]

but for something like a door a better approach would be a repnotify variable, since that would preserve state

[opal gyro]

exactly

[shut vigil]

so i should be calling that blueprint interface on the server?

[quasi tide]

Am what I'm saying not followable or something?

I spelled it out pretty plainly

[opal gyro]

yeah i'm just saying what durox said

[quasi tide]

1. Client gets a reference to the actor
2. Client checks if the actor implements the interface
3. If it does - do a server RPC from the player, that passes a reference to the server RPC function
4. On the server RPC implementation - just take that actor reference and call the interface function

[shut vigil]

I did it

this way the Blueprint interface is called on the server

[blazing spruce]

Thats not it

[opal gyro]

don't multicast

[shut vigil]

but it worked

the door opened for both playuers

[quasi tide]

Just because it works, doesn't mean it is right.

It could be lying to you

[kindred widget]

Now DC the client and reconnect.

[blazing spruce]

you'll come to learn that it working and it being correct are two different things lmao

[opal gyro]

@shut vigil watch this vid https://www.youtube.com/watch?v=gfXcIF5-CRU&t=490s&pp=ygULa2VrZG90IGRvb3LSBwkJxwkBhyohjO8%3D

[shut vigil]

okay I removed the multicast and it still works

I dont understand how it isnt correct if it works?

[quasi tide]

Because when a client connects - it won't show the state that is on the server

Which is why you were told to do thing in the onrep

Or heck - even if they walk away from the relevancy range and then back in

[opal gyro]

watch that vid i sent, it explains it well

[shut vigil]

so your saying if the server player opens the door, and then the client joins. for the client the door would be closeed?

[quasi tide]

Correct

[shut vigil]

so where would i do the repnotify

would i do it in the interact code

[quasi tide]

In the door

When you interact with it

[opal gyro]

the door should have a IsOpen variable that u set on interact

[quasi tide]

You flip the bIsOpened bool or w/e you call it in your door actor

Then in the OnRep function that was created for that variable when you flipped it to OnRep style of replication, you write code that happens when the variable's value is updated.

If you are in C++, you have to call the OnRep function manually only on the server

[shut vigil]

okay so

The door takes a while to open

and close

should i set it at the end of the timeline?

[quasi tide]

No

[opal gyro]

no you should play the timeline when the variable is changed

[shut vigil]

so i chould call this

at this flip flop correct?

or am i being dumb

[opal gyro]

all your interact needs to do is change the value of bIsOpen

and you don't need any RPCs in the door itself

[shut vigil]

okay so where do i set it to be true or false?

[opal gyro]

OnInteract or whatever ur interface function is called

just flip it there

[shut vigil]

this?

does toggle state need to be on server?

[opal gyro]

toggle state needs to be onrep like i sent

[shut vigil]

What?

Im so lost

[shut vigil]

Like this?

[opal gyro]

no

like i just sent

just move toggle state from there into the generated OnRep function for your variable

the OnRep function is called automatically whenever a change to the variable is received from the server

[shut vigil]

oh it worked

huh

should I still have this interact blueprint interface called on server?

[opal gyro]

Yeah you p much always want interaction done server-side

[shut vigil]

Ok

so

Correct me if i misunderstand

or lemme just ask why then

Why are we doing this?

Can we just do a flip flop?

[opal gyro]

the flip flop might not necessarily match the value of the variable

that's cleaner anyways

[shut vigil]

okay now one more question

For my items

I have it where a actor is on the ground and then you do the interact blueprint interfacew and then it calls an event in the player blueprint to add that component on the server

like this

This is in the player blueprint

and is called on the actor whenever you intereact with that actor

Is this the proper way to do this?

Or can I use rep notify in the actor as well?

(the other event called on that even are here btw)

@opal gyro

I have these events in the player blueprint becaus ethe client doesnt own the actor

[opal gyro]

Well technically you don't need to be doing server RPCs because, remember, we're now only calling the interact interface on the server already so we know that's where that's happening. So anything called off of Interact is happening on the server.

[shut vigil]

so now I can just do all the adding the component to the character in the actor itself?

[opal gyro]

Also kind of gross that you have a function specific to the flashlight in the character class. The flashlight should give itself to the interactor and destroy itself.

Yeah you should add an input to your interact function that passes the interacting character to the object.

[shut vigil]

the "other actor" Varibale it from here in the character blueprint

[shut vigil]

okay

Im gonna do that in a bit cuz this was a headache so

Ill get back to you about it

thanks tho

Netcode is hard lol

[opal gyro]

Just takes practice

honestly people make it out to be harder than it is outside of specific stuff

[quartz iris]

anyone help me pls 🙁

[dark edge]

repnotify

OnRep_bIsBroken -> do whatever should be done that depends on bIsBroken

ez

[meager spade]

also why the execute on server

in beginplay

especially if this actor is not owned by a client

...

Beginplay -> HasAuthority -> True -> Build planks, Mark planks array replicated -> Hit -> Server Remove plank -> remove plank -> planks array changes, onrep removes the blanks. ideally though you would want to do planks a lot smarter, ie how client shows/removes them. Personally if there is a fixed number of planks in fixed order, you can be smart and just replicate the plank count and client/server runs determentistic logic based on the plank count

this is how i did my zombie's style windows years ago

we literally just replicated the board count lol

we used multicast for anyone visual to it, to play the board removed/added animation

the onrep was purely for late joiners to know how many boards were there without playing visuals

though we didnt even need to use the OnRep

cause beginplay on client actually set the board count

from the server

[dark edge]

I wish OnRep defaulted to including a timestamp or something to let you know the when or why of where that state comes from, you'd be able to do so much with it

[lament flax]

if a component is not set to replicate, but gets loaded at runtime because its placed on a not replicated actor placed in a level/spawned at rutnime.

what would GetNetMode return ?

[fossil spoke]

@lament flax The NetMode is determined from the NetDriver, the Actor/Component itself doesnt have anything on it that affects its determination.

The World has a reference to the NetDriver

Actors access the NetMode through the Worlds NetDriver.

[meager spade]

^

Role is dofferent to netmode

And serge diff purposes

Serve

[lament flax]

so even if not replicated, since the world has a netdriver it would correctly find out if the actor/comp is on server or client

[fossil spoke]

Yes

[lament flax]

thanks

i guess thats why its more "expensive" to check net mode than role

[fossil spoke]

Ehh, I wouldnt be concerned about the performance overhead of either of those things.

[lament flax]

yeah ik, i just remember being mentioned somewhere

[quasi tide]

I wouldn't really say any are even remotely useful to even think about in terms of "performance"

It is literally an int check

[lament flax]

btw, any metrics i should keep in mind when profiling net bandwitch ?
ill soon profile my fragments stuff but i got no clue of what is "good" or "bad" perf-wise

[lament flax]

by expenseive i meant epic meant how the value is returned

for role its directly on the actor as a member var, for net mode the driver has to do stuff

[quasi tide]

Move one single component and it is already more expensive than checking the netmode or net role.

[fossil spoke]

Get it as low as you can without sacrificing what you consider necessary to ensure the systems core functionality.

[lament flax]

thats kinda broad

whats the 100fps equivalent net-wise 😆

[fossil spoke]

Thats bandwidth optimization...

In a nutshell

[lament flax]

how many kbps or w/e

[fossil spoke]

0kbps ideally

[quasi tide]

Does it work networked right now?

[lament flax]

when profiling outside networking, you have a target fps

here idk what to target (at least as a minimum), would help when trying to make the number smalls

[quasi tide]

I'd handle all of the edge cases of networking before thinking about performance.

[lament flax]

what ? my prefabs props ?

[quasi tide]

Whatever you're trying to guesstimate

[fossil spoke]

Its quite literally just getting the amount of data as small as possible.

[lament flax]

i want to see how much it takes in bandwitch when having 500 actors, each with 1 PSC (a component), each PSC has 5-10 replicated props (uobject)

totally arbitrary numbers, just trying to max it

so this is 5000 replicated uobjects

[fossil spoke]

Well your results will depend entirely on the size of those properties.

Its more efficient to send a int32 than an FVector

So

[lament flax]

all under one actor, which i assume is 10x better that having it spread across all actors

maybe not revelancy wise tho...

wherever you are on the map its reped

[fossil spoke]

Generally speaking, unless you see saturation issues, I wouldnt worry about bandwidth straight away.

[lament flax]

well of course, im just trying to optimize the replication process on my side

if the user has a gigantic UObject its his problem

[lament flax]

what would you check for instead ?

i never worked on profiling network, just go things "working", using push model and dormancy

[fossil spoke]

I would be optimizing other things instead like CPU usage. Bandwidth is pretty decent these days.

[lament flax]

how do i ease the server CPU

i guess low tick time on netdriver tick and replicate actor ?

[fossil spoke]

You mentioned a couple methods already.

PushModel and Dormancy are mechanisms to aid in reducing CPU overhead for replicated Actors/Props

[lament flax]

i wish we had dormancy and relevancy per subobject

so much power

[lament flax]

thats why i also used a single fast array that holds all of my replicated UObjects

instead of having normal arrays on hundreds of comps

the only thing "slow" would be itrating the fast array on queries, but i think c++ iterates 10k+ entries quite fast

[quartz iris]

Why is it not working the way im doing it so i understand what i did wrong

[dark parcel]

The outliner only shows the server world by default, you can change it but maybe just take matt advice.... give them a cube shape or something just to test.

Im not even sure what you are trying to breakpoint, again as i ve seen from your code, the ptr is not replicated so client one will remain null

[verbal ice]

Is there a way to override the behaviour of actor relevancy on the clientside

I want an actor that's spawned dynamically to not be destroyed when it becomes irrelevant

Somewhat like map loaded actors

[fossil spoke]

@verbal ice I dont think there is.

[verbal ice]

Bummer

Engine mod time

[fossil spoke]

@verbal ice The NetDriver has a ShouldClientDestroyActor function

Which is called to determine if that given Actor should be removed due to the ActorChannel being closed.

Its virtual

So you might be able to use that

Its called in UActorChannel::CleanUp

[verbal ice]

Ooooh sweet, will take a look

[quartz iris]

I tried that but it still doesnt work

It doesn't work for either the server or client now

[thin stratus]

• You shouldn't scatter data that is linked across multiple Arrays.
  • PlankArray and PlankHealth belong together. This should be a Struct with the two properties and then just one Array.
• Your original code calls the Multicast on BeginPlay. BeginPlay calls for the Server when the Actor is spawned. That doesn't mean the Clients are connected yet, which means the Multicast would not reach anyone.
• Multicasts are wrong here. This is a state and needs to be handled via RepNotify variables and their OnRep functions.
• You might be running into a race condition between the boolean bAlreadyBarricaded and PlankArray, as either of them could be replicating delayed.
  • PlankArray would also need to be RepNotify, and you'd need to do the same logic that you do in the OnRep_AlreadyBarricaded function in the OnRep_PlankArray.
    • Potentially a good idea to make a function for this and call that twice instead of duplicating code!
  • I'm not sure what Plank1 to Plank11 are, but if they are Components of the Actor and not runtime spawned, then you don't need to replicate them.
    • You also don't need to replicate the PlankArray then, because the Components already exist locally. Just call SetPlankArray on Server and Client.
    • PlankHealth would need to be replicated still though. If you combine the two into one Array of Struct, then you'd still replicate the whole array I guess, but you don't need to replicate each individual PlankX.

• You are calling too many ServerRPCs. You are already ensuring that you are calling the code on the Server via SwitchHasAuthority.
  • Setup doesn't need to be a ServerRPC.
  • SetPlankArray doesn't need to be a ServerRPC.
  • As previously said, MulticastDestroyPlanks shouldn't be a thing, as this is state and should be done via RepNotifies.
  • Same goes for MulticastDestroyTeamWalls.
  • Destroy1Barricade doesn't need to be ServerRPC either, as Event PointDamage should only call on the Server to begin with.
    • Don't put numbers into function names. This should be called DestroyOneBarricade if at all.
  • The collision, physics, etc. logic in Destroy1Barricade should be handled in an OnRep. This is state! You are only doing it on the Server atm.

[normal fulcrum]

Hey
Can somebody briefly explain, how WP and Relevancy work together?

If I have a player outside of listen server host player range, server will keep the client loaded for sure, and use this data as a streaming source for WP? I need to have enemies around the "distant" players

[opal gyro]

Hey folks, trying to figure out why a subobject of mine isn't being replicated to the client. The tricky part is that it's a replicated UObject reference on a replicated UObject, and I'm replicating both as subobjects of an actor component:

    FReplicationFlags* RepFlags)
{
    bool bWroteSomething = Super::ReplicateSubobjects(Channel, Bunch, RepFlags);

    // Recursively gather the subobjects.
    TArray<UObject*> Subobjects = {};

    for (auto& Entry : EquipmentList.Entries)
    {
        if (Entry.EquipmentInstance)
        {
            Subobjects.Add(Entry.EquipmentInstance);
            Subobjects.Append(UAristottleToolboxFunctionLibrary::GatherReplicatedSubobjectsRecursive(Entry.EquipmentInstance));
        }
    }

    for (auto Subobject : Subobjects)
    {
        if (IsValid(Subobject))
        {
            // UE_LOG(LogTemp, Log, TEXT("Replicating %s"), *Subobject->GetName());
            bWroteSomething |= Channel->ReplicateSubobject(Subobject, *Bunch, *RepFlags);
        }
    }

    return bWroteSomething;
}```
The main subobject (the item instance) is replicated just fine, but the dynamically created nested subobject (the inventory container) is never updated on the client (remains null). Here is the code that sets up the container (called on the server):
```UItemInstance* UCompositeInventoryFunctionLibrary::InstantiateItemDefinition(const UItemDefinition* InItemDefinition, UObject* InOuter)
{
    UItemInstance* ItemInstance = nullptr;

    check(InItemDefinition != nullptr);
    check(InOuter != nullptr);

    // Create the instance and set its definition
    ItemInstance = NewObject<UItemInstance>(InOuter, InItemDefinition->ItemInstanceClass);
    ItemInstance->SetItemDefinition(const_cast<UItemDefinition*>(InItemDefinition));

    // Set up the fragments
    for (auto Fragment : InItemDefinition->Fragments)
    {
        if (Fragment)
        {
            Fragment->OnInstanceCreated(ItemInstance);
        }
    }

    return ItemInstance;
}```
And here is OnInstanceCreated (where the nested subobject is being created):
```void UItemFragment_Container::OnInstanceCreated_Implementation(UItemInstance* Instance)
{
    Super::OnInstanceCreated_Implementation(Instance);

    if (!Instance->Implements<UContainerItem>())
    {
        auto ClassName = *Instance->GetClass()->GetDisplayNameText().ToString();
        auto DefName = *Instance->GetItemDefinition()->DisplayName.ToString();
        UE_LOG(LogTemp, Error, TEXT("Item instance %s is not an IContainerItem but definition %s has the container fragment."), ClassName, DefName);
        return;
    }

    // Clone the container and initialize it.
    UInventoryContainer* NewContainer = DuplicateObject<UInventoryContainer>(ContainerTemplate, Instance);
    NewContainer->InitializeContainer();

    // Set the container on the ContainerItem
    IContainerItem::Execute_SetContainer(Instance, NewContainer);
}```
Any help with this would be much appreciated, please lmk if you need to see more. I tried debugging this by doing a Log in the `ReplicateSubobjects` function but it never gets printed. How do you debug something like this?

[exotic wasp]

is there a reason you aren't just using the replicated subobject list?

the new method?

[opal gyro]

since I need to gather subobjects recursively (item could have a container which holds its own items and so on), this seemed simpler to set up.

[candid pumice]

hello everyone, I am new. I want to know can I make a peer to peer multiplayer in Unreal 5 without c++ or making any server payment?

[quasi tide]

UE doesn't support Peer to Peer out of the box. It uses a listen server. You can do it in all BP if you want, but you'll be fairly limited in some areas.

[summer hinge]

Hey yall. Does anyone have any advice for a good method of syncing up Level Sequences over the network? Local testing of the "Replicate Playback" checkbox on the LevelSequenceActor is pretty rough. Has anyone found success with any other methods?

[quartz iris]

Thank you for the detailed post, is this the correct way of doing it? It seems to only work for the server still

[blazing spruce]

I would read his response again a couple times mate, he said you shouldn't use multicasts but you're still using one for state changes (PlankArray & PlankHealth).. with the switch has authority you're already making sure your begin play runs on the server so you can just set the plank array directly, because its marked repnotify the OnRep function will get called on both the server and the clients so no need for a multicast

[nocturne quail]

client should not set the replicated variable, in your MC you are setting it using server+clients, MC calls on all clients and server.

if you want to set it using MC, add a check of has authority, but in your case you don't need MC because you are not using it anywhere except setting a replicated var

[nocturne quail]

is this changed in UE5 or its me doing it not the correct way to reference the first argument passed to FText::Format ?

if (ExistingItem->IsStackFull())
{
    return FItemAddResult::AddedNone(Item->GetQuantity(), FText::Format(LOCTEXT("StackFullText", "Couldn't add {ItemName}. Tried adding items to a stack that was full."), Item->ItemDisplayName));
}

LogTextFormatter: Warning: Failed to parse argument "ItemName" as a number (using "0" as a fallback). Please check your format string for errors: "Couldn't add {ItemName}. Tried adding items to a stack that was full.".

[nocturne quail]

solved using FFormatNamedArguments I hope it has no bad sides

FFormatNamedArguments Args;
Args.Add("ItemName", Item->ItemDisplayName);
return FItemAddResult::AddedNone(Item->GetQuantity(),FText::Format(LOCTEXT("StackFullText", "Couldn't add {ItemName}. Tried adding items to a stack that was full."),Args));

[grand axle]

Are you trying to sync players bones from control rigs chaos physics sims? if so that would be costly and I don't think UE does that out the box, I could be wrong though don't trust me

[empty rune]

i dunno i followed gorka games tutorial on physics based movement

[grand axle]

I have a question though, Trying to optimize my game for in/out rate for my physics. Is there a way to expose what gets sent through UE? Currently using their experimental Physics tools but there isn't much documentation on that. currently it's not too bad, but I could see it getting wild when I add more physics objects to the scene so I want to limit how much my Scene physics objects send

[empty rune]

the problem is with the physics on it only shows the animations to whoever the moving player is but to other clients it dosnt show the movement, where as without the physics the animation works well in multiplayer

[grand axle]

My guess is enabling Chaos control rig sims for clients on their end

[empty rune]

?

[grand axle]

you may have enabled them locally but not to them

[empty rune]

what are you talking about

[grand axle]

are you not using control rig for your physics animations?

[empty rune]

no

[grand axle]

ah than I have no idea

[empty rune]

i have animations and then im putting physics ontop with simply this code

like without that code theres no physics at all

[graceful flame]

You can do the simple stuff to save on performance such as setting a slower tick rate. Can also do some dynamic tick rate adjustments based on distance. I did something similar for my NPCs where the further they are away from the player the slower they tick since they aren't as visible anways. I used the significance manager for that. https://dev.epicgames.com/documentation/en-us/unreal-engine/significance-manager-in-unreal-engine

[grand axle]

Distance isn't a thing in my game, everthing is on the one screen. Tick rate maybe might work but then physics objects might not sync as smoothly. I will have to explore that a little more. I wonder if the experimental tools cull like smooth sync does

[graceful flame]

Maybe something like a tick rate that slows down with a long tail. So it starts off fast and seems highly responsive when the player first interacts with it then over time it can tick at a slower rate when things more or less come to a stop and settle at their resting spot?

But ya anything physics over the network is a pain because its replicating transforms which are a lot, best kept to a minimum whenever possible, or even better just replicate the event to start the physics and then have the physics all clientside if you can get away with it.

I'm not sure what the context is here but say for example with an exploding wall its more performant to use repnotify on a single boolean and have all clients run the phyiscs themselves than to replicate each chunk's transform.

and say the exploding wall should cause damage to anyone nearby then a simple box collider could be actiavted and applying damage to any player who ventures too close

[grand axle]

Think rounds or stickfight as the game

I have client side phsysics where need be. it's more I want for example, 30 boxes stacked on one another. I need to limit it's Data sent, Cull floats to doubles and remove Y Coords etc

[graceful flame]

well sphere colliders are cheaper than box colliders so you can start with that but then they might behave like spheres instead of boxes and start rolling around

[dark edge]

how much state does that represent?

how much stuff is replicating

[grand axle]

That statistic was from 10 physcis objects

[dark edge]

what's your replication mode, the old ue4 implementation?

[grand axle]

I think though maybe I can have the tick rate increased based on Angular/Linear velocities length?

[dark edge]

you don't want to change the update rate of physics, just how often it's synced

[grand axle]

This is 5.6 experimental interp and prediction

[dark edge]

I'm sure there's somewhere in there to tune the replication rate

[grand axle]

I'll have a look, I did change the default 100hz to 120 or 144hz for the servers

[dark edge]

so you turned it up

is that the tick rate or the rate at which it tries to replicate

[grand axle]

This is for Players

Then objects in the world

I do see there is a network physics settings component. I wonder if that will work

[graceful flame]

@grand axle have you tried looking at the network profiler yet?

Start the game then use netprofile enable play for a bit then netprofile disable and then you load up the exe and load up the captured data.
UnrealEngine\Engine\Binaries\DotNET\NetworkProfiler.exe

https://dev.epicgames.com/documentation/en-us/unreal-engine/using-the-network-profiler-in-unreal-engine

Main goal is to reduce waste by avoiding unnecessary replication checks utilizing dormancy, net cull distance squared, net priority, and net update frequency.

https://www.youtube.com/watch?v=mT8VUVuk-CY

[gray blade]

Assertion failed: MappedClientConnections.Remove(ConstAddrRef) == 1 [File:D:\build++UE5\Sync\Engine\Source\Runtime\Engine\Private\NetDriver.cpp] [Line: 6918]

I get the above error in my game only when a client disconnects from a lobby after accepting an invite through steam overlay specifically, anyone encounter this before and know whats going on?

[grand axle]

Is this okay or not? Also not sure why but for some reason the camera isn't being set on players some times, even though I set the camera like 5 times

Currently stress testing on local, not sure if this will shoot up online with ping yet

[random gazelle]

does anyone know why my client doesnt have pitch camera rotation?

[dark parcel]

Can you elaborate?

[random gazelle]

as you can see the client is looking straight up but the host cant see that

theres no camera pitch for some reason

[dark parcel]

@random gazelle well you would have to translate that to the animation part. E.g the head bone looking up

I mean regardless where the player is looking at , its not as if the capsule component rotate along with it.

Tldr Your player view looking up or down doesn't rotate the mesh up or down.

If you need info of the clients control rotation, its already replicated via getBaseAimRotation.

[random gazelle]

yes it does with the host

proof

[dark parcel]

@random gazelle I'm talking about the mesh comp. You can see that the panda is still looking straight. So what is it you want to replicate? Just the flashlight?

[random gazelle]

i want the flashlight and the head to turn where the camera does on client like the host does lol

[dark parcel]

the head doesn't rotate where the camera goes host or not to me

you will need to modify the head bone rotation

I would attach the flashlight to the modified bone so it rotate along with it.

[random gazelle]

There’s no bones bro

[dark parcel]

well you want the panda head to look up or down right?

doesn't it have bone?

[random gazelle]

It’s not a character mesh

[dark parcel]

well my suggestion would be to modify the panda head bone transform and the flashlight just rotate along with it

[random gazelle]

I just made a panda out of static mesh to show you that he’s not facing up

[random gazelle]

There’s

No

Bone

[dark parcel]

ok calm down

I wouldn't know

I helped you earlier, I mean no harm

if you need the info to replicate the pitch

it's available on getBaseAimRotation node.

the value is basically the control rotation (where the controller is looking at)

[kindred widget]

10 gold says you just need to replace the rotation getter with GetBaseAimRotation.

[tardy fossil]

yea GetBaseAimRotation will fix it

cause it auto handles clients using remote pitch

[dark parcel]

rotating the flashlight only gonna feels weird anyway. You would eventually want a character that holds a flashlight and it just roate with it.
Here's my attempt using GetBaseAimRotation, modifying the pelvis. Can easily be a horror game where the player aims a flashlight and instead transforming the flashlight, i can just transfrom the pelvis.

But the idea is the same regardless, you can just apply GetBaseAimRotaiton to your flashlight if you don't want to have a character that look up or down.

@tardy fossil copied someone code, is this still relevant?
I had a bug back then because unbeknown to me the value is compressed. So for client side, they have to be re-mapped.
Not sure if still relevant today.

void AAGPlayerCharacter::AimOffset(float DeltaTime)
{
    if (IsLocallyControlled())
        AO_Pitch = GetBaseAimRotation().Pitch;

    if (GetBaseAimRotation().Pitch > 90.f && !IsLocallyControlled())
    {    /** map pitch from [270, 360] to [-90, 0] because of compression */
        const FVector2D InRange(270.f, 360.f);
        const FVector2d OutRange(-90.f, 0.f);
        float L_AO_Pitch = FMath::GetMappedRangeValueClamped(InRange, OutRange, GetBaseAimRotation().Pitch);
        AO_Pitch = FMath::FInterpTo(AO_Pitch, L_AO_Pitch, DeltaTime, 15.0f);
    }
    else
    {
        AO_Pitch = FMath::FInterpTo(AO_Pitch, GetBaseAimRotation().Pitch, DeltaTime, 15.0f);
    }
}

[tardy fossil]

yea that will still happen since remote view pitch is encoded to a uint8 or uint16

negatives will just wrap around to be positive

[dark parcel]

🙇‍♂️

[nova wasp]

uint8 is rather extreme amounts of quantization for a rotation, uint16 is fine

if you really want you could get weird and have horizontal and vertical be different amounts of bits

but I would say just stick with the default short (16) bit quantization for rotation and it will be fine

[tardy fossil]

lol i remember my last game i was replicating pitch AND yaw as a single uint16.. now that was extreme

0-512 for yaw and 0-128 for pitch

[nova wasp]

one thing I tried was having the "common areas" use more of the values

where it sort of stretches out more in the less used angles

[tardy fossil]

ohhh thats interesting.. like having the center have more precision and the extreme angles have less? i could see that working

[nova wasp]

yep

I think it might be easier to just make it relative to the owning pawn transform or something though

I prefer to bind the aim rotationa and transform in one struct for networking

because that way you do not risk them being randomly sent

which is really not important for games that don't have extremely fast movement

[last storm]

Hey, i'm trying to replicate a list of UObject but it doesn't work.
In my ActorComponent which hold this list I:

• bReplicateUsingRegisteredSubObjectList = true; in the constructor
• AddReplicatedSubObject(NewAura) when I add to the list,
• RemoveReplicatedSubObject(OldObject) when removed from the list
• add List to GetLifetimeReplicatedProps and DOREPLIFETIME
• set the List as ReplicatedUsing

In my UObject:

• add GetLifetimeReplicatedProps and DOREPLIFETIME all necessary variables
• add virtual bool IsSupportedForNetworking() const override { return true; }

Do I miss smth ?

[nova wasp]

did you follow the docs? your setup looks okay from what I can read here but definitely double check https://dev.epicgames.com/documentation/en-us/unreal-engine/replicating-uobjects-in-unreal-engine

also not sure if you are saying it doesn't work, or asking if this is what you need to do

[last storm]

I'm saying that it doesn't work. On client list is always empty

even after onrep being called

[nova wasp]

is the object ever created on the client? I am not asking about the replicated list here, but just if the object ever was instantiated on the client from a network bunch

also, are you using iris? (I would suggest leaving this for now, it's experimental and will require some extra steps)

[last storm]

I don't think so, how can I know that ?

[last storm]

we're not using it

this is how I create then add. it's only called on server

[nova wasp]

does ::MakeAura always create a new instance?

[last storm]

Yes

[nova wasp]

also I can't tell what the list is

if it's pushmodel based you should mark it dirty

[nova wasp]

for starters if this is ue5 you should have this be a real TObjectPtr but that probably doesn't matter much here

[kindred widget]

Is your actor component set to replicate? Is the actor it's on replicating?

[nova wasp]

also if this list changes often per-element it would be much nicer as a fast array because you can react to individual changes

[last storm]

I used to have a TObjectPtr here, but moved to raw pointer to test stuff

[kindred widget]

@last storm You are getting OnRep calls on the client though?

[nova wasp]

I assume the onrep just has empty pointers in the array

[last storm]

Yes I do, but OldList always empty, ListAuras always empty

[kindred widget]

Odd. I don't see anything you're missing. I mean for completeness I use the same thing in my inventory system.

protected:
    UPROPERTY(ReplicatedUsing=OnRep_InventoryItems)
    TArray<TObjectPtr<UInventoryItem>> InventoryItems;```
```cpp
UInventoryComponent::UInventoryComponent()
{
    PrimaryComponentTick.bCanEverTick = true;
    SetIsReplicatedByDefault(true);
    
    bReplicateUsingRegisteredSubObjectList = true;

}```
```cpp
void UInventoryComponent::AddItemToInventory(UInventoryItem* ItemToAdd, bool BroadcastChange)
{
    if (IsValid(ItemToAdd) && !InventoryItems.Contains(ItemToAdd))
    {
        InventoryItems.Add(ItemToAdd);
        AddReplicatedSubObject(ItemToAdd);
        
        if (BroadcastChange)
        {
            OnInventoryUpdated.Broadcast();
        }
    }
}```
```cpp
bool UInventoryItem::IsSupportedForNetworking() const
{
    return true;
}```

[nova wasp]

why is this taking the old one by value? you want a const ref here

especially for something as larges as a tarray

[last storm]

I could add const ref tbh, just forgot

[nova wasp]

and yeah this list of steps looks fairly complete to me

I suspect we are not being shown something

I'm wondering if theres a project setting that matters for replicated object list

[last storm]

I'll try after adding this:```bool UAurasManagerComponent::ReplicateSubobjects(UActorChannel* Channel, FOutBunch* Bunch, FReplicationFlags* RepFlags)
{
bool bWroteSomething = Super::ReplicateSubobjects(Channel, Bunch, RepFlags);

if (!ListAuras.IsEmpty())
{
    for (auto Aura : ListAuras)
    {

        bWroteSomething |= Channel->ReplicateSubobject(Aura, *Bunch, *RepFlags);
    }
}

return bWroteSomething;

}```

[nova wasp]

GDefaultUseSubObjectReplicationList can change if this is used by default or not

also is bReplicateUsingRegisteredSubObjectList = true in the ctor of the object that OWNS the subobjects? or the subobjects?

[last storm]

Ok, smth changed when I added this, now list is replicated. when I add one on the server the list one my client also replicates BUT, the object in the list is null

[kindred widget]

Can you show the object creation code? The.. MakeAura I think it was?

[last storm]

Too long for discord, but here is the makeaura

[kindred widget]

For a start, you'll want to set it's outer.

EG

UInventoryItem* NewItem = NewObject<UInventoryItem>(this, UInventoryItem::StaticClass());```

This is in the component, sets this component as the outer of the InventoryObject.

[last storm]

so, for exemple, I shoud: NewAura = NewObject<URegenerationAura>(player->auramanager, AAuraManager::StaticClass()); ?

[kindred widget]

The second param for class is optional. but yeah. If Player->auramanager is the correct component that will be replicating the object.

Unreal uses outer paths for lookups. So it's likely that it can't find the object on the client if it's looking for...
SomeActor.AuraManager.AuraThatGotReplicated, cause it doesn't exist, it was never created with that as the outer.

And pointers are replicated that way. They're essentially a pathname over network so that it can be looked back up in the local PCs memory.

[last storm]

I've read UObject need owner for replication, I was confused because you can't set an owner of a uobject, so it was maybe an error and they were talking about outer

[kindred widget]

Quite likely. 😄 Definitely two very different systems since Unreal has a literal Ownership chain for networking stuff as well.

[last storm]

when I'm doing this, I crash at the second CheckF

[kindred widget]

Oh

I misread your code, no you don't need the second option. That's to specify a specific class for creation.

The <UObjectName> part is a template, it'll autocast the return pointer to that type.

[last storm]

Oh, so I just need "UInventoryItem* NewItem = NewObject<UInventoryItem>(this, UAuraObject::StaticClass());

[kindred widget]

Like.. Say you have
USomeAura
USomeChildAura1
USomeChildAura2

You want to use the return as USomeAura cause you don't care what subtype it is. So you write NewObject<USomeAura>(Outer, USomeChildAura1::StaticClass());

This creates a USomeChildAura1, but passes it back as a USomeAura pointer.

[last storm]

Ok ! thanks !

[pliant jungle]

Hello, do you know if it’s possible to replicate an UObject array in a UObject which is itself in an AActor ?

[last storm]

gonna try that, I'll keep you in touch, thanks alot !

[kindred widget]

Technically yes. But you should still outer the objects to the owning actor probably. Which means that the actor would replicate the objects, and the array of pointers on the object would just be replicating the pointer pathnames.

@last stormSide note to this system that you'll want to be aware of for later. I ran into this fairly early with inventory since a core part is to transfer items between inventories.

You cannot rename the object into another outer. Or.. You can, but the moment the original actor dies, it takes the objects with it.

Like you have ActorA, ActorB. And you rename the object from ActorA to ActorB, two seconds later ActorA is destroyed. ActorA is actually still the one that replicated the objects even though they were renamed. So they'll remain on the host machine, and be destroyed on clients.

So if you end up at a case where you want to transfer Auras from one manager to another, DuplicateObject, don't Rename.

[last storm]

good to know, thanks a lot. Unfortunately, adding outer doesn't replicate the uobject neither

[kindred widget]

Can you to a lookup? Uhh..

[last storm]

Idk what I need to show haha

[kindred widget]

TArray<UObject*> Subobjects;
GetObjectsWithOuter(this, Subobjects, true);```

Stick this in your OnRep and breakpoint it. See what ends up in the Subobjects list. If any of the Auras are there.

[last storm]

lemme a second

[kindred widget]

This is assuming the OnRep is in the manager component, which it should be if that's what you're making the outer.

[last storm]

it is

[nova wasp]

the ctor should also run when created

I forgot to say that earlier about seeing if it's created from the network

you can breakpoint the ctor

[last storm]

this shows me an aura ! not null !
But now, why is it null in my list then ?

[nova wasp]

did you mark the list dirty?

[last storm]

when and how should I do that ?

[nova wasp]

using push model replication is a good idea because you are explicit about when things are dirty

MARK_PROPERTY_DIRTY_FROM_NAME(ThisClass, MyReplicatedProperty, this)

if you are using C++ replication you should probably have these... all over the place

even if it's just in a setter

it's a bit tedious but in theory the idea is you save on wasting time spam polling for changes on tick (instead this thing declares who has new data to send)

in practice things can get polled anyways 😦

[kindred widget]

It shouldn't be OnRepping if nothing was sent though.

[nova wasp]

oh yeah, and if all else fails you can yell at unreal to make sure the actor is checked with ForceNetUpdate();

[nova wasp]

true enough but depending on onrep settings it might always send that upon creation

[last storm]

Am gonna be a bit annoying but since I add this, everything seems to work pretty good

Like, List is replicated, object are replicated

[nova wasp]

fast array would be a good idea though still I think

[kindred widget]

Wait. The original array now has items?

[nova wasp]

I think what they mean is they just use that call to find the elements

[last storm]

since I try to GetObjectWithOuter, yes xD

[nova wasp]

or do you mean that just by searching for them they suddenly appeared in the replicated property you made? that's odd

[kindred widget]

O.o I would remove that and try a rebuild to see if it's working without it. There's no reason that it should cause that to work.

[nova wasp]

I'm confused

[last storm]

Searching for them made them suddenly appeared IN THE LIST

[nova wasp]

if you are hot reloading or live coding it is time to restart the editor

[last storm]

Previously the list was full of nullptr

[last storm]

i'm not

[nova wasp]

well that is kinda freaky... is something making them wait to resolve until this happens?

[last storm]

even after deleting the GetObjectWithOuter, they are still here my lil auras

Weird stuff ngl, not gonna pretend this is the first weird behaviour I've ever seen

[kindred widget]

It won't be the last. Welcome to Unreal Engine.

[nova wasp]

machine gods are pleased

carry on

[last storm]

haha

Thanks to both of you

it will help alot

One last thing, why OldList always null ?

    UPROPERTY(ReplicatedUsing = OnRep_ListAuras, VisibleAnywhere)
    TArray<TObjectPtr<UAuraObject>> ListAuras;

    UFUNCTION()
    void OnRep_ListAuras(const TArray<UAuraObject*>& OldList);```

[kindred widget]

Even if you make a second object?

It should be whatever data the client had before the OnRep was called.

[last storm]

Yes, I've tried with 3, and it's always empty

[kindred widget]

Did you create them with intervals between or all at once?

[last storm]

Interval, they are created with keyboard input so...

[kindred widget]

That's odd.

Your code looks fine. I don't have an easy way to test that atm. Could maybe breakpoint and walk up the callstack to see where that is supposed to be sent from.

[last storm]

IDK at all , idk if this gonna be an issue for me rn but this issue shows up idk if it was normal or not

[kindred widget]

If you get three OnRep breaks, and they incrementally add entries to the array, but the old array is empty, I'd say that either the client is altering the array somewhere, or something is horribly wrong.