multiplayer

[gritty flume]

Thanks a lot for helping me overcome that blocker! much appreciated<3

[coarse mirage]

Anyone knows what plugin i need to use for UE5, when trying to make multiplayer? Do i need the Online Subsystem Steam or the Steam Advanced Sessions Plugin ??

[fathom aspen]

To do multiplayer, you don't need plugins.
Online Subsystem is one thing, and a plugin is something else.
Online Subsystem Steam lets you ship your games to Steam, so it's vital!
Steam Advanced Sessions plugin is an addon functionality to ease up the process of creating/joining sessions etc.
For more info about both, either search the web or see #online-subsystems

[coarse mirage]

Thanks, I’ll do that

[jovial dawn]

Hi all, I've created a small multiplayer game but I'm a bit confused on how to save my player to an external database and create a login menu and load my character. I have a website with a mysql database so I guess that should be enough to store the player information. From what I've read, I need to create some sort of lobby/login but I don't know where to start? Are there any tutorials on this subject? or examples. maybe so I would like to find the right security way to not get hacked from the beginning lol. I was thinking of creating a login page on my website and with a confirmation via email a code will be sent and the player will have to enter this code when he starts the game. I know that some games already use this method... but what bugs me is how to save and load the data.

[glacial talon]

Does anyone have Network Prediction working in 5.0.1?

[latent heart]

Does it actually work? I thought it was vaporware by this point.

[glacial talon]

Was "working" in EA, now it's an instant crash when used with a client

[latent heart]

And the crash is?

[glacial talon]

something about the rewind data not having any frame history, I can't make much sense of it

set your default pawn to NetworkPredictionExtras_ControllablePhysicsBall with >1 players and try to PIE boom crash

[hoary spear]

I always thought one had to layer it once more due to some ownershiprules and whatnot (not my area tbh), but cool to know that it can be called directly like that!

[kindred gazelle]

You can try a rep-notify bool called something like "IsOpen". Rep-notifies will create a function which is executed whenever the variable is changed. You could then put the timeline on a separate custom event which is called in the notify function. Whether the timeline plays or reverses would then be based on the value of "IsOpen". And after "Event Interact", you could get "IsOpen" and set it as the opposite of what it currently is.

[pallid mesa]

wouldn't put the timeline in the onrep. On the OnRep I'd simply pop-open the door

let the fvx and sfx and smooth movement be processed by your non stateful code

[kindred gazelle]

Yeah you can't put a timeline in the function anyway. Or do you mean a timeline shouldn't be used at all?

[pallid mesa]

onrep shouldn't call an event that calls the timeline, that's what I am saying 😄

but timelines are okay for this use case, you can make your door open in a nice way with some awesome curve

why this

because if people join the match/game or if someone enters the relevanvy sphere of the door

they will get to see the doors making noises and smoothly opening/closing

which is not needed

[hoary spear]

And probably not desired

[kindred gazelle]

True, but on the other hand its now client-side so any lag won't affect the animation

[pallid mesa]

noo

its not client side

overlaps run separately sv and client and on authority you can pop open it after the fact... take a look at UT doors code

their impl isn't perfect but the concept is there

[kindred gazelle]

I'm not sure I understand this. Do you mean it should be done with an rpc which does the anim, with an onrep that switches on authority to pop open the door?

[pallid mesa]

no, no rpc's needed

remember that overlaps get called in the server and client

you can check for authority and swap an onrep whenever you want

ie: exec timeline -> on finish -> authority -> onrep to true/false

[kindred gazelle]

Since this isn't an overlap, wouldn't on authority fail?

Yes. Try doing the same thing in the door blueprint, but also once you've done that send a screenshot of your blueprint here since it sounds like something isn't quite right

[pallid mesa]

if this isn't an overlap then you'd need to bring this behaviour to the server somehow... by means of a server RPC

but interaction needs to pass by the controller

[pallid mesa]

noo, you did very good looking into interaction interfaces

buut your character shouldn't know he's interacting with a door

basically all the character should do is to handle the replication bit

and the door is going to be your interactor

so these events you have there in the character

should be moved to the door

so now the task is

you need to find a way to bring this server/cli interaction calls to the door BP

and the door bp is going to do the rest

and by doing it that way, you'll be able to provide a more generic and encapsulated view of how to interact with things

now give it a try 😄

ye

but remember your door needs to get the server and client call for your interact event

so you will have to handle the replication bit in the pawn

[marble fox]

Why can i not set bReplicateMovement = false? It just says Member is inaccessible. I Have incluced the actor.h and ye

[winged badger]

is it private?

if so there will be a SetReplicateMovement function instead

[marble fox]

Yeah i just tried that

[bitter oriole]

Show the code, show the output log.

[real ridge]

can someone tell me how are lobbies created does anyone have experience with it ?

like lobby with team a and team b and 5 and 5 players and they have readinness status

ready or unready

i have eos i dont know if lobbies are included there

[marble fox]

I did the SetReplicateMovement and it worked

[pallid mesa]

that looks much better! @feral narwhal

There are ofc things to improve but the key ideas are there

now... remember that we might be interested in letting the door have the client call aswell.. listen servers don't require to server rpc as they are authority already

so in listen servers the server is a player, thus you won't need to do any RPC in such case

so something convenient is two check authority and only issue the rpc if you are on a remote connection

• giving the door the client handle opens room to prediction

so its convenient to have 😄

[finite goblet]

Can you have beacons between two standalone clients?

[frosty remnant]

I have a question regarding this picture:
https://cdn.discordapp.com/attachments/972589172571398174/972831632421687306/unknown.png

Pawns are listed in the intersection, but that depends entirely on how/where you spawn them, correct?

If you spawn a pawn in server-only code, that pawn only exists serverside. Likewise for client-only code. I've got that correct, right?

[pallid mesa]

Yes, only if the pawn isn't replicated

if the pawn is replicated when you spawn it on the server, the pawn will replicate to the clients

So what this diagram means is that replicated pawns are in the server and in the clients (without making distinction on local client or not)

[young kestrel]

So I'm doing what the docs says to do but I can't seem to be able to override certain functions.
The "serialize" when overriding returns a Linker Tool error (LNK2019).

Another Issue I found when following the instructions is that my game freezes completely. I seem to be able to join but nothing works, even the editor completely hangs up.

It would have been great if Epic actually would have done a real guide to that instead of a very small side note that even has errors in it (like the FCharacterMoveResponseData doesn't exist, only the Container does).

I guess I'll be stuck on that issue for a while until I know how to fix that LinkerTool issue.

[marble fox]

Hey so just a question, If i set something as replicated and do if (HasAuthority() Destroy(), Shouldnt it destroy on the server and then replicate for every client?

Im still learning this so yeah

[solar stirrup]

Yep, it'll destroy it on clients as well

[marble fox]

yeah but i did a fast if statement and i dont have authority which i wonder why, And in a tutorial im looking at he just uses SetReplicates(true) and nothing more then he jsut does a if statement and destroys it

Heres like how i kinda did it, Im still very new to this so dont judge 😄

[solar stirrup]

You need to call Interact on the server

[marble fox]

So like this?

ahh i see

[dusty radish]

hey, I may be missing something here but I'm calling to the player controller to create a widget in a session and the host creates the widget no problem but when the client creates the widget it's added to the host's screen. any help would be amazing. here's some screenshots of the setup. I'm using UE 5.0.1

[fathom dust]

If I want to represent a state machine on the server via a replicated enum property in the GameState, with the guarantees that 1) every client sees every change (none are skipped) and 2) the changes happen in the same order, what approach should I use?

I've found that regular replicated variables will skip intermediate state changes if they happen quickly.

[fathom dust]

Double check that the Possessed event happens on clients

[dusty radish]

hmmmm that appears to be an issue, the server is responding to both the host and client joing the session

[fathom dust]

If not, you can make the CreatePlayerCounter a Client RPC

Client + Reliable

[dusty radish]

So I created the using the event begin play instead and that seems to work really well

ah it makes the widget on the client but also make another one on the host

[fathom dust]

yeah

[dusty radish]

how would I go about this?

[fathom dust]

I think you should use the New Controller pin from the Possessed event

[dusty radish]

well i'm a little closer now haha

[fathom dust]

Click on the red CreatePlayerCounter event node in the player controller

And you should be able to change it in the details panel. I am on a phone and don't recall exactly where it appears in the UI

There's a really good PDF that Cedric Neukirchen wrote

https://cedric-neukirchen.net/

[dusty radish]

That's great! I've got them created not I just need to replicate the variable, thank you for the help and I'll give that a read

[marble fox]

But i still quite dont really understand, Does everything that should replicate be connected to a rpc? Well i guess yes now since this worked but OnRep etc i understand what it does, When the replicated variable changes the onrep gets called but when should i use OnRep and just HasAuthority? Its a bit unclear in my head still

And doesnt RPC's need to be bound to the character also?

[solar stirrup]

You'll need to call it on an actor you own, so PlayerController most of the time

You want to execute most things on the server since in the end, it has authority over the game

[marble fox]

So for this example i have a delegate that my pickup binds too in the constructor and via that the character gets called, And since that is called the main func will also work like that, So doesnt that mean everything almost has to be called on the playecontroller / pawn+

[marble fox]

yeah, Because im taking some course for multiplayer rn where he makes inventory etc all of that, And inside the weapons it has a bunch of RPCS but last time i tried to use RPCS on this actor / pickup i just got a bunch of errors

[solar stirrup]

Unless you own an actor, you can't call a Server RPC on it as a client, so yeah you might have to route things through the PC/Pawn sometimes

[marble fox]

Soo, The Pawn / PlayerController has the own the actor?

If thats the case i got no idea how this works XD, Since the videos im following he just made the weapon system and its an Actor class by it self it isnt childed or anything just a brand new Actor c++ class with a bunch of code and it has a bunch of rpcs

[compact talon]

does seamless travel using the server travel node (advanced sessions with steam subsystem) not work in the UE5 editor?

I have play as listen server with 4 clients and using ServerTravel does nothing but return "true"

[latent heart]

Oooh

I thought that green leaf thing was some new trend.

It's just a new person indicator. 😦

[lime ledge]

Are you talking about the serialize in your struct that inherits from FCharacterNetworkMoveData?
Have you implemented the function in your .cpp? That error means it cannot find the function. Either it isn't implemented at all, or maybe a typo in the name, or the parameters don't match, that sort of thing

[marble fox]

I still dotn get how this works, Clients can see whats happening even tho it isnt going through an rpc?

[young kestrel]

That's why it's weird. I have copied the definition from the "CharacterMovementReplication.h" and pasted it in my custom CMC class

(Picture One is my Class and Picture Two is in the CharacterMovementReplication.h file.

[marble fox]

Can someone tell me why this will work with HasAuthority() even tho i havent made a Server function for this?

[lime ledge]

Do you have a version of FStylzNetworkMoveData::serialize(...) implemented in the .cpp ?

[lime ledge]

Depends what you mean exactly. But has authority doesn't mean that you are a server necessarily. If you are playing standalone your actors will return true when asked if they HasAuthority()

[marble fox]

But in this case it means im on the server right? Since im on a dedicated server

Im doing all of this using a dedicated server

[young kestrel]

I have it like that in the .cpp file.

[lime ledge]

Yes, if you are running dedicated server only calls on the server would have authority. Any clients connected and calling the same function would not

[lime ledge]

Hmm, sorry it is a bit hard to say what your problem might be. Maybe you can post the full error?

[marble fox]

Yeah, But i got no idea how that works since the EquipWeapon function is only on my character, Doesnt get have a server implemented function or anything so i dont understand how that works

[young kestrel]

The original was on German, so this is a translation

LNK2019 Reference to unresolved external symbol ""__declspec(dllimport) bool __cdecl UE::Net::WriteQuantizedVector(int,struct UE::Math::TVector<double> const &,class FArchive &)" (__imp_?WriteQuantizedVector@Net @UE@@YA_NHAEBU?$TVector@N@Math@2@AEAVFArchive@@@Z)" in function ""bool __cdecl UE::Net::SerializeQuantizedVector<10>(struct UE::Math::TVector<double> &,class FArchive &)" (??$SerializeQuantizedVector@$09@Net@UE@@YA_NAEAU?$TVector@N@Math@1@AEAVFArchive@@@Z)". StylzMainProject F:\Projects\UE5\Stylz\StylzMainProject\Intermediate\ProjectFiles\StylzCharacterMovementComponent.cpp.obj 1

Never saw an error like this before, so it's pretty cryptic to me.

The error appears twice. The same one.

[lime ledge]

Chances are you are missing a module dependency. I think that kind of code resides in NetCore but you would need to check to be sure.
So adding that in your <ProjectName>.build.cs file to the Dependency list

[lime ledge]

Right yeah I think you need to get your head around the general multiplayer concepts a bit further 🙂 But any function you create can be called on either the client or the server (but not called on the server from a client, or vice versa unless it is an RPC). In your case the client can call that function locally (no communication with the server), but it won't do anything due to the check for authority. Hopefully that makes some sense 😛

[young kestrel]

Okay. I will try that. Thanks.

[marble fox]

So like, That if statement wont go through or what?

Cause im getting a bit confused rn, I only have a few RPCS inside the character and none of them connects to this function

[young kestrel]

Okay that fixes the issue with the compiling. Now I need to find out why the whole game + editor freezes when joining the server.

[2022.05.21-18.08.19:813][520]LogNet: UNetDriver::TickDispatch: Very long time between ticks. DeltaTime: 0.70, Realtime: 21.00. IpNetDriver_1
[2022.05.21-18.08.19:813][520]LogNet: UNetDriver::TickDispatch: Very long time between ticks. DeltaTime: 0.70, Realtime: 21.00. IpNetDriver_2
[2022.05.21-18.08.19:824][521]LogNet: UNetDriver::TickDispatch: Very long time between ticks. DeltaTime: 21.00, Realtime: 21.01. IpNetDriver_0

Okay I found the issue

Thanks for helping me 🙂

[lime ledge]

No problem, good luck with your game 🙂

[marble fox]

Like this Inside my weapon is a function called OnEquip that just calls the attachmeshtopawn, And that func looks like this

But there is not a single rpc that calls these functions so how can the other player see that it is in the hand

So how can the other players see it i dont understand

This is the character function btw

[dusty radish]

I'm calling this function when the host quits the game so that the client will be disconnected properly and then will be allowed to connect to another session but the session isn't destroyed on the client side. can anyone see something I missed?

[marble fox]

Yes ik it has OnRep_EquippedItems() but should that really make a diffrence so all the others player can see it?

[latent heart]

Will HasAuthority() return true for autonomous proxies too?

[lime ledge]

Depends what you do in there 😛 It's very hard to say what is going on for you, but I'll throw out some random suggestions.

• Could be a replicated property
• Could be one of your RPCs telling them to equip
• Could be your MeshComponent is replicated
• Could be all your clients are actually equipping locally (say when you run over a pick up, for example)
• Could be something else 😛

[pallid mesa]

depends ™️

[marble fox]

Yes it is a replicated Property yes, I can send some more pics if you want 1 sec

And all that happens inside the OnRep_EquippedItems is that it calls OnEquip

[pallid mesa]

if you are setting that replicated variable in the server, there you have it

this is the typical ShooterGame style weapon equipping code

[marble fox]

So if i do like in GetLifetimeReplicatedprops, DOREPLIFETIME(ASurvivalCharacter EquippedWeapons) will that automatically be on the server?

Like this

[pallid mesa]

nope

like.. from a client you can get to the server through a RPC

[marble fox]

yeah i understadn that

[pallid mesa]

onreps triger behaviour when the variable value changes

[marble fox]

yeah

[pallid mesa]

so you can put a breakpoint and use the debugger to find out the role

callstack will provide the execution flow

so you can figure out where this server execution comes from

it's a bit - advanced... but the sooner you grab the debugger the better

[marble fox]

So wait wait, ah idk how i should say'

It isnt getting called from any rpcs thats all i know

[pallid mesa]

well the server flow should come from somewhere you know

[marble fox]

yeah ik but i cant trace it down

Inside Weapon.cpp it isnt any rpcs there either

[pallid mesa]

debugger is the solution in these cases where dry reading the code is complicated

but yeah dry reading the code can be a bit complex as you are seeing here

probably the character handles parts of that

ie: switching weapons ect.

[marble fox]

yeah

[pallid mesa]

my suggestion is for you to explore what happens when you press the switch weapon button in your character

maybe that's insightful

[marble fox]

yeah it happens when i pickup the weapon / equip the weapon

[pallid mesa]

mhm then track the switch weapon behaviour starting in the character

because when you press a key in your KB from a client, that's client code that needs to be brough to the server

[marble fox]

yeah

The interact function is not going through a rpc but it gets called inside a function that goes through a rpc so i understand how that works

ahh i found it im pretty sure

[pallid mesa]

oh!! Good job!!

[marble fox]

Its just it is such a dynamic system so it was hard to find

[pallid mesa]

yep!

multiplayer code can get complicated to read 😄

glad you got it!

[marble fox]

Since it has an inventory etc, It has its own UObject then its own Actor that is actually spawning etc, And the uobject is based of another class that has everything inside it im pretty sure

or no wait what

[pallid mesa]

Some multiplayer articles I wrote:

• Multicast/Client RPCs VS OnReps (Towards stateful replication):
  https://vorixo.github.io/devtricks/stateful-events-multiplayer/

• How to replicate thousands of Actors efficiently (network managers):
  https://vorixo.github.io/devtricks/network-managers/

• A better and non-destructive synced network clock:
  https://vorixo.github.io/devtricks/non-destructive-synced-net-clock/

• Understanding replication atomicity (why you need NetSerialize on some critical structs)
  https://vorixo.github.io/devtricks/atomicity/

• Rewinding in multiplayer games:
  https://vorixo.github.io/devtricks/simple-rewinding/

[marble fox]

Sorry, What does explicitly mean? Im not so good at these words in english since english isnt my First language, Is it if we call if like OnRep_TheName() inside a function or

[latent heart]

Implicit = it is not said, but is still true.

Explicit = You are told

[marble fox]

So it is like this void functionName() { OnRep_OnRepNameHere() }
will this call on the server too? I just realized im not so good at english after all

[pallid mesa]

haha in this case it means that server onreps won't get called in C++

unless you call the function

yes correct eggo

[latent heart]

No it won't..

[pallid mesa]

but usually you'd do a wrapper

[marble fox]

2 answer now my brain is twisted

[pallid mesa]

if you call the onrep function explicitly from the server

it will execute the code of inside the onrep function

what @latent heart says is that this doesn't imply any RPC

or any... client->server

[latent heart]

But just running that function from anywhere won't call it on the server. It will call it locally.

[pallid mesa]

correct!

[latent heart]

You need to call it from the server to run it on the server.

[pallid mesa]

yes

[marble fox]

So this wont be called on the server too short this up

[pallid mesa]

no

[marble fox]

It was thist part i got a bit confused at what you meant

[pallid mesa]

only if you call it from the server

so setting a variable != calling a function

[latent heart]

That is there because, in BP, OnRep functions are called on the server automatically when you change things on the server.

In c++, you have to call them yourself on the server.

[pallid mesa]

yes, but he's right

it's not very well written per se

let me try to write it better

[marble fox]

ah alr, Now my brain got even more confused cause im trying to search for where this get's called on the server

[latent heart]

Basically you have some sort of code pattern like this

[marble fox]

It has to be inside EquippableItem or something since that is literally where all the equip items are a child of

[latent heart]

{
  MyValue = NewValue;
  if (Server)
  {
    OnRep_MyValue();
  }
}```

[pallid mesa]

correct

actually... sometimes

SetMyValue(int NewValue)
{
  MyValue = NewValue;
  if (Server)
  {
    MyWrapper();
  }
}

OnRep_MyValue(){
  MyWrapper();
}

I've seen that also lots of times

which is also valid

[latent heart]

Yeah.

[marble fox]

yeah i asked inside the discord server where the tutorial / tutorial dude is at rn

I asked him about this how does this HasAuthority() go through

[pallid mesa]

I mean without context, clueless

anyways I gotta do a revision based on your feedback eggo

trust me, it was great!

[marble fox]

alright :D, No worries i guess

Alright im just gonna ask some more questions

So this whole function is actually coming through an rpc from the character, And the rpc does the useitem on the Item.h which this equippable item is a child of so i guess that would make this use also through the server

And does that make every other function inside this one also go through a rpc? So like Setequipped also gets through the server?

cause then everything i understand how it goes through, Cause then the bEquipped that is replicated gets set to a new value and if that is also on the server then everything makes sense

[compact talon]

seamless server travel seems to persist the player controller through levels, which is behaviour I wasn't expecting.

Is this reliable? Can I store information such as player cosmetics on the player controller and have it apply to the character on spawn?

I was originally going to save that information on the host and on level change I would deliver that information to each player controller manually as I didnt expect it to persist

[pallid mesa]

@marble fox @latent heart A bit more verbose, but does it now read better?

[pallid mesa]

not through an RPC, it means that at that point you are in the server!

the RPC gets you to the server

it's like taking a ramp

[marble fox]

Yeah yeah, But does that mean the SetEquipped func will like everything in there will be on the server etc?

[pallid mesa]

"to the server I go"

yes everything after the server RPC that follows the execution flow will be on the server

[marble fox]

ahh then it all makes sense

[pallid mesa]

👍

[marble fox]

Its calling so many functions tho so in the end after tracking i got to the equip function which pretty much does everything

As you can see here

and all this comes from the use function

So its like idk how many functions it goes through

[obsidian cargo]

Calling OnRep on the server? That would be super confusing when debugging. Why not have a shared function for server and client that OnRep calls?

[pallid mesa]

Most of the times you'd wish to store cosmetic choices in the PlayerState... for that, take a look at APlayerState::CopyProperties

[pallid mesa]

that's a wrapper

[marble fox]

alr let me read 1 sec

[marble fox]

Yeah this makes more sense

[pallid mesa]

But that can get pretty verbose I fear

that's the pattern I follow the most

see here

[obsidian cargo]

Where is this written?

[pallid mesa]

.

[obsidian cargo]

Keeping things descriptive and concise is so difficult with programming

[pallid mesa]

@obsidian cargo Pinned

probably provide also code with the example?

😄

[compact talon]

Are there benefits to seamless travel outside of transferring player information? I would prefer to not use it.

Like performance benefits, or maybe not using it results in disconnects on map change sometimes?

[pallid mesa]

TBH @compact talon haven't dug much into the benefits of seamless travel, so I cannot give you a proper answer

[compact talon]

I see, I am very new and I dislike behaviour that I don't expect. What I was expecting is on map change everything to reset and then I would manually transfer over the information I want into the new level.

I am having issues with seamless as it keeps the player controller persisted so information I don't want passed is getting passed etc

I should probably just change my game so it works better with seamless travel, but it is very intimidating

[pallid mesa]

"...to call the contents of the onrep..."

eeeeh not too sure

😸

writing this down so its super duper clear is hard haha

[obsidian cargo]

How about "The server won't and shouldn't call OnRep. If the Server needs to do the OnRep behavior, move the behavior to another function and call that function from both the Server and OnRep."

Gah, handling the OnRep / RPC order of 3 interrelated things is a pain.

I'm basically following the the pattern (pseudocode) OnRep_ThingA() if (!ThingB || !ThingC) QueueForLater()

It kills me that I know I'm going to do a lot of Queueing when the data IS THERE, but the RPC / OnRep fired in the wrong order.

[pallid mesa]

yeah those are implementation details

[obsidian cargo]

I'm fairly new with network programming. Is this a common situation to resolve?

I know you can wrap it all in a structure to force arrival at the same time

But that's not really a solution in this case

I fear it would make packets too large.

[pallid mesa]

you gotta netserialize to ensure atomicity

otherwise you cannot ensure order

[obsidian cargo]

In my case ThingA is an event (RPC, reliable) that affects a few dozen things (replicated as index + eventID pairs in a FastArray). And ThingC only happens very rarely.

A Reliable RPC with an array of potentially hundreds of ints sounded like a problem.

[pallid mesa]

I mean, depends ™️ on what you do with it

but we've spoken a lot about arrays/fast arrays in here...

it's quite a topic x'D

[still mulch]

Hey all,has anyone tried replicating advanced arpg
Currently giving it a go as it a needed for my game but I’m having the worst luck

Any help would be greatly appreciated

[obsidian cargo]

Yeah. I like the simplicity FastArrays offer in regards to diffing.

[pallid mesa]

but at the same time TArray replication can be more benefitial

that's the big depends ™️ clause

[obsidian cargo]

I'm gradually mutating my code to be more similar to how GAS GameEffects are replicated

But GAS replication is very complicated

[pallid mesa]

it is, yeah.

[obsidian cargo]

They have really clever usage the NetSerialize UPackageMap to allow server to filter data sent to specific clients

[obsidian cargo]

I'm too much a novice with networking to give real advice, but you might get more help if you narrow your question to more specific problems.

[pallid mesa]

mind telling me which file is this in?

I want to take a look aswell

[obsidian cargo]

It is all wrapped in the FPredictionKey

It is one of those things that is genius in the simplicity

Though I was wondering if it was a problem to keep a long term reference to UPackageMap

Given GAS is used so heavily everywhere it is apparently not an issue

[pallid mesa]

that's deprecated in 5.0 @obsidian cargo

[obsidian cargo]

Ouch! Shot to the heart!

Guess I should see what they do in UE5

I need similar behavior in one of my inhouse plugins, but don't want to add GAS to it.

[pallid mesa]

UPTRINT PredictiveConnectionKey = 0;

what is this 😄

ah an unsigned int pointer

so it's equivalent but now its using an unsigned int pointer to avoid holding a direct reference

🧠

@obsidian cargo

[obsidian cargo]

Oh so kind of holding a handle for it?

[pallid mesa]

it's holding the pointer

but not using the type

[obsidian cargo]

Oh I see, they only care about the address

[pallid mesa]

basically this is simply to avoid hard referencing the UPackageMap

[obsidian cargo]

I noticed UPackageMap could cast to UClientPackageMap (?) which has a connectionId

[pallid mesa]

my first reaction was: what's "up trint"?

[obsidian cargo]

But that is a lot of extra processing if the UPackageMap address isn't volatile for a connection

[pallid mesa]

probably the tradeoff is worth it

otherwise they wouldn't have done it

[obsidian cargo]

More generic to use UPackageMap directly (avoiding the cast), but I'm not sure how many times you would have a non-client connect to the server.

Or if the concern is from the client connection's perspective

[still mulch]

My issue is maintaining state variables

As they determine montages and stuff

At first it was working with no replication of variables needed but for some unknown reason it just stopped,my guess is I have to replicate it

[glad escarp]

So, I'm experimenting with the way I want to do shooting in my FPS. I would like to have actual projectiles because it's a sci-fi game with blasters and plasma cannons etc. My ADS function moves my weapon to a slot at the center of the camera view which misalignes the weapon location vs where it exists on the 3rd person display mesh. Should I move my camera to the weapon instead? Maybe I just answered my own question.

[amber yew]

Is there any decent macro for minimizing whole declaration of multicast delegates?

[compact talon]

Is there no way to get seamless server travel working with PIE?

[winged badger]

weapon can have its own camera attached just the way it needs to be

[glad escarp]

Ohhhhh. Ok that makes alot of sense. And then just do a blend to view

[winged badger]

you just SetViewTargetWithBlend while aiming

yes

[glad escarp]

Genius. Thanks m8

[winged badger]

never looked into it, since i was expecting a very painful experience if i try

but out of the box, no

[compact talon]

fair

[winged badger]

source engine editing, maybe

[compact talon]

also does this event run when loading a new level with seamless travel? As they don't reconnect, they are taken with the server

so I would assume not

[winged badger]

it doesn't use HandleStartingNewPlayer instead

works for login and for seamless

as its called from both PostLogin and HandleSeamlessTravelPlayer

its blueprint native, default _Implementation calls RestartPlayer() which spawns the Pawn in default operating mode

so if you want that behavior, you need to call Parent function from BP

[compact talon]

if I want to use exclusively for seamless I assume I would want HandleSeamlessTravelPlayer then, is that even a BP event?

[winged badger]

don't think thats exposed

[compact talon]

ouch

I want players logging in to be auto kicked (game started), and players already in to have stuff happen

[winged badger]

but you would generally use a different gamemode on lobby and game levels

[compact talon]

I can just loop through existing players though as I store it in an array

yeah I have a lobby gamemode and base gamemode for all my minigames

[winged badger]

if you want to autokick anyone joining in late, you should really refuse login

via GameSession class

at least they get a proper network failure reason from the engine then

[compact talon]

I see, I am not sure how to implement that. I did want to refuse login but it didn't seem possible

[winged badger]

best way is to override AGameSession::ApproveLogin

c++ required tho

[compact talon]

Yeah, this is my first game and I am trying to avoid C++ where possible. For future games I do want to get very involved with it tho

[plain spade]

Hey y'all, I'm trying to access the keys from a map (its on the game state) on a local UI, but the keys come up as null when I try to access them. How can I get around this?

[compact talon]

It's rare for players to join post game anyways as I don't list it in the server browser, so they would need to load the browser then the host starts before they login.

[winged badger]

overriding a function or two in c++ is hardly rocket science

it doesn't involve you designing your own code structure

[compact talon]

I think I had to override a few for GAS

[winged badger]

which is kinda the hardest part

you'd probably be just fine to have it return TEXT("Insert your custom failure string here");

[compact talon]

would exposing the seamless travel player event in C++ be complex or is that also relatively simple?

[winged badger]

do note that when HandleStartingNewPlayrer is called

[compact talon]

so I can use it in BP

[winged badger]

the controller parameter will have a valid PlayerState already

and that PlayerState will have called CopyProperties before that

[compact talon]

hrm, yeah I have seen people mention PlayerState. Currently I just use the default and haven't made my own

[winged badger]

so any data you transferred via PlayerStates from lobby to game via CopyProperties is available at that point

which is very, very convenient

i carry over my character setups/loadouts via PlayerStates from lobby to game

and much more, but this seems like a reasonable first step

[compact talon]

I see, my game is extremely simple so all I need to carry from lobby and throughout the game is player skin + score (which is stored server only)

[winged badger]

PlayerStates can keep scores and you can show the leaderboard ingame that way on clients

as long as the scores are set only on Server, its fine

[compact talon]

Interesting. My score only updates at the end of each level so I didn't consider using player states for it

[winged badger]

PlayerStates persist through seamless travel

[compact talon]

Should I be using a separate player controller for lobby and game? I currently do but that breaks the seamless travel as it changes player controller

[winged badger]

it doesn't break it

only if you're doign something weird

😄

[compact talon]

weird, what happens then?

[winged badger]

depends what you do

but if controller class changes it will just instantiate new one

prior to calling HandleStartingNewPlayer

[compact talon]

So information stored on the Lobby player controller would transfer to the Active player controller?

like cosmetics

[winged badger]

no

but

if you do it via PlayerStates

[compact talon]

So I should have a custom player state and use the same state for lobby + game

[winged badger]

and transfer it via CopyProperties function (it has access to both old and new PS when called)

[compact talon]

ah

[winged badger]

it still works just fine

[compact talon]

yeah I really need to try and wrap my head around player states

I wasn't going to use them but they seem like they would make my game a lot simpler than it already is

[winged badger]

its designed to work with them, the multiplayer framework

so its generally easier to just use them

[compact talon]

Can clients mess with player state? I was going to exclusively store player scores on the gamemode and hosts game instance because I didnt want clients to be able to manipulate scores with cheats/hacks

assuming only the gamemode sets the score

[winged badger]

they can with their own instance

but that won't help them

[magic yoke]

to do a server RPC, clients have to own the object they're calling from. Clients own controller and default pawn only before you start messing with things.

anything clients do is always local, to do anything non-local, they have to make an RPC

so you can do something along the lines of Player State -> sends stuff to client, and Player Controller -> sends stuff to server

since the server can use state to RPC to the client since it owns the player state

[winged badger]

it doesn't matter if the PC or PS send a RPC

security is exactly the same

and client can use Server RPCs on PS

[magic yoke]

So long as the original call is made inside something the client owns right?

[winged badger]

PlayerState's owner is PlayerController

so its owned

[magic yoke]

I thought PS was owned server side not client side

weird

[winged badger]

there is no serve or client side to ownership

[compact talon]

Would there be an issue with having the same PS used in lobby and game? That way I don't need to transfer information over to new PS

[magic yoke]

sorry, I meant owned by the server*

[winged badger]

its literally few BP nodes, and you should have a base PS with transferred between levels data

[magic yoke]

replicate: doesn't buffer, repnotify: sends the new value if it's changed from default when player enters relevancy range. Player doesn't receive the history of the changes.

Is my understanding

[winged badger]

and CopyProperties implemented on it, even if you need different PS classes

[compact talon]

I dont need the copy properties event do I with seamless travel as the PS persists?

assuming I use the same PS

[winged badger]

void AController::InitPlayerState()
{
    if ( GetNetMode() != NM_Client )
    {
        UWorld* const World = GetWorld();
        const AGameModeBase* GameMode = World ? World->GetAuthGameMode() : NULL;

        // If the GameMode is null, this might be a network client that's trying to
        // record a replay. Try to use the default game mode in this case so that
        // we can still spawn a PlayerState.
        if (GameMode == NULL)
        {
            const AGameStateBase* const GameState = World ? World->GetGameState() : NULL;
            GameMode = GameState ? GameState->GetDefaultGameMode() : NULL;
        }

        if (GameMode != NULL)
        {
            FActorSpawnParameters SpawnInfo;
            SpawnInfo.Owner = this;                      <<< note this line here
            SpawnInfo.Instigator = GetInstigator();
            SpawnInfo.SpawnCollisionHandlingOverride = ESpawnActorCollisionHandlingMethod::AlwaysSpawn;
            SpawnInfo.ObjectFlags |= RF_Transient;    // We never want player states to save into a map

            TSubclassOf<APlayerState> PlayerStateClassToSpawn = GameMode->PlayerStateClass;
            if (PlayerStateClassToSpawn.Get() == nullptr)
            {
                UE_LOG(LogPlayerController, Log, TEXT("AController::InitPlayerState: the PlayerStateClass of game mode %s is null, falling back to APlayerState."), *GameMode->GetName());
                PlayerStateClassToSpawn = APlayerState::StaticClass();
            }

            PlayerState = World->SpawnActor<APlayerState>(PlayerStateClassToSpawn, SpawnInfo);
    
            // force a default player name if necessary
            if (PlayerState && PlayerState->GetPlayerName().IsEmpty())
            {
                // don't call SetPlayerName() as that will broadcast entry messages but the GameMode hasn't had a chance
                // to potentially apply a player/bot name yet
                
                PlayerState->SetPlayerNameInternal(GameMode->DefaultPlayerName.ToString());
            }
        }
    }
}``` @magic yoke

[magic yoke]

fascinating, help material online proven wrong again

thank you

[winged badger]

it will still get reinstantiated if controller class changes

[compact talon]

I see

[winged badger]

but you can use same PS class, just implement CopyProperties

[dusty radish]

Hey, does anyone know a solution to my issue?

[magic yoke]

anything you need a player to know when they enter relevancy range should be repnotify. Anything that's one time/temporary can be just normal replicated

do note: that means anything that won't be default

[compact talon]

so for handling stuff like players loading cosmetics I would save the information to the player state in the lobby, and whenever the player state begins play it gets the mesh and modifies it with the cosmetics?

[magic yoke]

like a player changing colours

if you leave relevancy and come back, they will be default colour again

[winged badger]

@tulip ferry non relevant Actors don't replicate to clients if they are static (loaded from level), if they are Dynamic (spawned at runtime) they are destroyed while not relevant and respawned when they become relevant again

[magic yoke]

it's pretty crucial for sure

I'm using rep notify way more than rep overall

[marble fox]

Already having some problems please help me 😄

What does this mean?

[winged badger]

GetOwner is a function, not a member variable

also, especially while still learning, avoid auto like a plague

[marble fox]

Oh i fr didnt see that

I should prob go to sleep at this point

[fathom aspen]

Because you are trying to destroy it twice on clients

So second time, it will fail to destroy because it's already destroyed

And anyways such session related questions should go to #online-subsystems 🙂

[drowsy flint]

anyone know how to fix this i'm trying to make a dedicated server and when i build in development server this errors apper

[drowsy flint]

Thanks you very much bro i try this

[rose prawn]

Hey people, if I trigger a Client replicated event from local player, would it completely ignore replicating and just trigger the event or still use network to fire action? The reason I'm asking is, I normally have a normal function which controls if it's locally controlled. If it's locally controlled, it triggers the logic. If not, it sends the data to client replicated function and trigger that way. So I'm wondering if it's unnecessary or not.

[winged badger]

there is no drawback in just using a client RPC

[rose prawn]

Thanks, will stop doing the thing I do then.

[coarse mirage]

is it possible to disable player collision so players can walk through each other ?

[fathom aspen]

Set Collision Channel to Ignore Pawns or w/e

[coarse mirage]

i just tried that in the player BP, in the Capsule Component, that didnt work, is it some where else i need to set it ?

[winged badger]

any c++ @coarse mirage

?

[coarse mirage]

no, only BP :p

[winged badger]

got enough skills to wrap a function an expose it to BP?

[coarse mirage]

haha no :p

[winged badger]

    /** Add an Actor to ignore by Pawn's movement collision */
    void MoveIgnoreActorAdd(AActor* ActorToIgnore);```

this is the function

you just need

UFUNCTION(BlueprintCallable)
void MoveIgnoreActorAddBP(AActor* ActorToIgnore) { MoveIgnoreActorAdd(ActorToIgnore); )```

oh

no you don't

[coarse mirage]

xD

[winged badger]

you can call IgnoreActorWhenMoving

on your CapsuleComponent

that one is exposed

[coarse mirage]

okay, i have no idea what you just said tbh :p sorry, im an idiot programming

[winged badger]

i can only repeat it

[coarse mirage]

np 🙂

[winged badger]

CapsuleComponent -> IgnoreActorWhenMoving

[coarse mirage]

ty 🙂 ill try look into that 🙂

oh got it woking 😄
But now the camera is going into the player xD
know how this can be fixed ?

its only going into the player, when they collide
nvm, got it working now, thanks for the help 😄

[winged badger]

it means SetOwner was called, or set in FActorSpawnParameters

[dusty radish]

I am? would you be able to tell me why that's the case please? Also, sure I'll post my next questions there from now on

[fathom aspen]

Yes. If host(server), you are calling a multicast RPC, which executes on host and all connected clients, and it destroys the session. You also destroy the session in case this is not the host(client). So you are destroying twice on clients. Now I can't tell if this is really an issue(sometimes that's safe to do), and I don't know what's the right way to do such stuff

[compact talon]

does server travel use a transition level if I dont use seamless travel?

[dusty radish]

ahhh I see! Thank you for explaining that. It still fails to destroy the session on the client side when the host calls this function however

[fathom aspen]

It clearly doesn't. Transition level is what makes seamless different from a non seamless one

[compact talon]

I see, I was going to not use seamless as it's giving me issues but I like using a transition level.

[fathom aspen]

I'm really not sure if you this function can be called client side, or it's enough to be called server side. Hasn't got my hands dirty enough with sessions yet 😦

[dusty radish]

ahhh okay that's fine, I've just had another look and think the flow of this mean that it should work as it shouldn't be called twice but still doesn't do much. If I attach a print string then it only fires once and never on the client side

[fathom aspen]

I'm not sure I understand what the change you made there

But anyways how do you call DestroySessionNicely?

[latent heart]

Object->DestroySessionNicely() ? 😛

[fathom aspen]

Also it does seem like DestorySession should be called on both hmmm

[fathom aspen]

Lel

I'm still not quite sure what type of PlayerControllers should be provided there though. server-side or both?

[dusty radish]

It's an RPC I created in the player controller, in the image you commented under there's no change just some scribbles over the top

[dusty radish]

That's the issue I'm having, this should call to the clients to destroy their session too (when the host leaves) but nothing happens client side. If I try leave the session as a client then the session is destroyed correctly and I can join another straight after

[dusty radish]

This is exactly the issue

[dusty radish]

I get the player controller and cast to the correct class and then as that class I call the function. I'm not at my pc anymore.

[fathom aspen]

That's it. It should be called on both. So calling it on both worked for you I assume

[twin juniper]

I have a data asset being replicated. But I then have an asset from a child class of the main data asset class which fails to replicate and outputs the error: LogNetPackageMap: Warning: FNetGUIDCache::SupportsObject: NewContainer_C /Game/ObjectInventorySystem/Inventory/Data/Assets/TestingContainer.TestingContainer NOT Supported.
Children of the main parent class replicate, but if it is a data asset from a child primary data asset class it fails until I resave the assets (the asset is already in memory/loaded), and issue comes back if editor is closed. What is going on? If I were to package and clients were to play my game would it fail to replicate to them despite the issue being fixed by saving the assets? (Cant test that because dont have an actual flow for such a test yet).

[neon mango]

Is it possible to connect to a host but not sync anything up? I really just want the connection to send commands from server to client and vice versa but my understanding is all things Unreal Networking related are with the context of things being synced up, same map, same actors etc...

[twin juniper]

Okay well nevermind this seems to be a bug in 4.27 which I also think is in 4.26, but not in 5.0

[vagrant falcon]

hi, have following code running inside of component and i dont understand why rep notify doesnt fire up on clients after begin play
so text still not changing 😭
i can fix it by putting same code as in rep notify on remote
but shouldn't it work so?

when i change variable after begin play somewhere on server side it works perfect
for example when collision overlap happens but not on beginplay

[neon mango]

Did you figure out the limitations of sequencer and multiplayer? Voice is synced up and so are material parameter collections but the niagara particle FX and animations are not. Looking into it as we speak.

[hazy slate]

Hello everybody.
I'm looking to make a dedicated server using Java and I'm following this course: https://ylazarev.com/2021/03/31/3-java-game-server-movement-in-ue4/?fbclid= IwAR3HhWq1DkpRly6xH__Lr_oeWaL-UcY8NeGcYaZ5pjdi3efTxeYOTqhlUUo . But for me it lacks quite a lot. Does anyone know a more complete course? And I want to deploy my server after finished to AWS but I can't find any documentation about it. Can someone help me ?

[fathom aspen]

Does the component replicate?

[vagrant falcon]

@fathom aspen In Class Settings Component Replication is True

i though post login issues should be solved by using repnotify instead of multicast

or am i doing something wrong

[fathom aspen]

Correct. Such stateful stuff should be done using onreps

[vagrant falcon]

mby my macro is wrong

[neon mango]

Something interesting but I guess it's just left over and not intended to work is you can set variables inside the animation blueprint to replicate but they will never replicate right? Even if their owning character is set to replicate?

[fathom aspen]

No it's ok

[vagrant falcon]

hmm weird

[fathom aspen]

Yes, Anim BPs don't replicate

[fathom aspen]

Does the health get replicated?

[vagrant falcon]

ok, my bad
default value of variable was already max health
if i change it, it works like it should 😂

[neon mango]

Should the sequencers replicate playback handle the life time triggers of a Niagara particle emitter put inside the sequencer? You'd think that if it at least tells the client which part of the sequencer we are in that we should see the same stuff happen? It's odd that the client doesn't see those results from sequencers replicated playback no?

It seems pretty straight forward though. All the information is there in the sequencer, just replicate the passing of time through the sequencer and things will more or less look right on both, its doing it for audio, but not for the Niagara actors in scene and they have no replication flag sadly even if just for this purpose.

it does look like that is what its trying to do void UMovieSceneSequencePlayer::UpdateNetworkSyncProperties() { if (HasAuthority()) { NetSyncProps.LastKnownPosition = PlayPosition.GetCurrentPosition(); NetSyncProps.LastKnownStatus = Status; NetSyncProps.LastKnownNumLoops = CurrentNumLoops; } }

[plain spade]

After more testing I have a new question: Is it possible to add components with maps to a game state? I have a component for an inventory that I wanted to be shared among players, but the map attached to that component keeps coming up null in the game state. Anyone know what might be happening?

[fathom aspen]

Maps don't replicate

[magic yoke]

maps don't, but a struct with an array of strings and an array of (whatever you want) does

🤡

[plain spade]

Looks like I'll have to pivot then, thank you

[plain spade]

I think what I'll do instead is add a "quantity" variable to my item structure and just get an array of the item names

[winged badger]

using c++?

[tame sapphire]

Does any one have any reference or tutorials on adding abilities when using a server character AI character (Seems to make a difference with message calls on other tutorials) ? Was due to reliably replicating the top down template or let me know if this belongs in another channel?

[deep geode]

Actor component exist both on server and client. Check if actor is locally controlled would be better

There should be a IsLocallyControlled() func when you cast the owner of the comp to a character

[compact talon]

I have a variable on my BasePlayerController.

I seamlessly travel from Lobby > Transition > Game, the lobby uses my Lobby Controller and the transition/game level use my Active Controller (both children of BasePlayerController).

I store player information on the BasePlayerController, as the controller persists through seamless travel. However it resets my player information structure variable on my base player controller, instead of persisting it.

Does seamless travel just not work how I expected?

or perhaps I am missing a setting, maybe I need to check replicated for the player info var?

[winged badger]

use PlayerState for storing that information, overide CopyProperties

PCs having the same base doesn't help one bit, its not the same instance

and copying their data would require overriding HandleSeamlessTravelPlayer in c++

PlayerState data transfer works out of the box

[compact talon]

I see, I did try using player state as per you recommendation yesterday but I was having a bunch of issues with it and I wasn't able to resolve them

let me try something else and see if it works

[atomic barn]

Hi how do I prevent the pawn from being destroyed when the client leaves the game?

[winged badger]

you override AController::Destroyed

[compact talon]

Is this not the right way to set a variable in a player state? The target is my lobby controller and this is happening in a loop for all players within the lobby gamemode

It just keeps using default player info from my state

[winged badger]

without seeing the entry point

no idea

[compact talon]

hrm, I will finish my lunch and come back with better information.

I was just being a dumbass, I missed a small connection somewhere a lot earlier in my BP...

[atomic barn]

What do I override in the function?

[winged badger]

its overriden in PC

it calls the PawnLeavingGame

which destroys it

you need to stop it from doing that

[latent heart]

Unposses the pawn and then just call Super::Destroyed

[dusty radish]

it didn't. the multicast is only called by the server and only works on the server. The event isn't sent to the client. I'm going to try another setup today and see what I can do

[dusty radish]

so I moved this function over to the widget that calls it instead of having it in the player controller and it works great

[crystal crag]

Can you not use world partition with a dedicated server yet?

[pallid mesa]

tried?

I was about to setup an experiment, literally now

like - I was opening UE5 to test this

[woeful wagon]

hello friends i have created the code but when it plays it only shows the scene2d component for the first character I've tried for each looping it and it didn't work so does anyone have any suggestions on how i can get a different scene 2d capture to play on a widget for each player in a multiplayer game?

[dusty radish]

are you wanting the widget to show on your players screen?

[charred crane]

I have a replicated actor containing a 3d widget and a sphere collision. When a pawn overlaps with the sphere collision, I want the widget to be visible only to that pawn. Any ideas?

[pallid mesa]

yes its possible but.... TLDR:

• DC server keeps all the cells loaded at all times
• Listens erver keeps all the cells loaded at all times

this can get pretty expensive specifically in the listen server use case

server streaming unfortunatelly isn't supported and I believe it won't be supported

[woeful wagon]

correct i want it to show up for everyonre and also be there own 2d scene capture

[near bison]

Can someone tell me how computationally expensive dedicated servers are/will be for a simple 3d board game? I heard even baseline server binaries are pretty expensive for UE5

[dusty radish]

try setting up the RPC to run on owning player to create the widget and then you might have to play around with what's shown on it

[crystal crag]

I just was curious because when trying to host a dedicated server using the 5.0.0 release code

it crashes and it seems to be world partition related

[pallid mesa]

Okay, all I mentioned is on PIE

let me cook a dev build and give it a try on localhost for at least listen server

@crystal crag according to your experience this would crash, right?

or you only tested on dc server?

[woeful wagon]

i tried a bunch of different cycles of this where i even set it up for the server to then replicate to the player but nothing worked for me was trying to see if anyone else has had this problem

ill try creating another function for it but it is not creating and assigning more than one scene capture

[crystal crag]

@pallid mesaIt seems to not happen if I use a standalone game and open up a listen server

but if I use a dedicated server, then attempt to join as a client, then it crashes

I can also have a client in PIE join the listen server and I don't experience the crash

only when joining a dedicated server in PIE do I get the crash. I haven't tried packaging it up and testing that way

[pallid mesa]

Ugh weird

I don't get the issue on PIE dc

@crystal crag this is a new project, blank with barely any stuff

Be sure to update your UE, I'm in the last hotfix

[crystal crag]

Yeah I need to do that

I'm still on 5.0.0

[pallid mesa]

maybe that's the case, try updating first and then check if you still get the issue

nothing on my side

[crystal crag]

Ok

[plain spade]

No BPS on this project

[normal garden]

Hello all, I'm working on an inventory system and encountered an issue I am trying to resolve. When a player picks up an object of the ground it is placed in their inventory. During pickup, I Rename() the component to set it's new outer, then Destroy() the Actor which represented the item sitting on the ground. On the client side this component is unfortunately destroyed as if it never recognized the Outer change, on the server it exists as expected. Is there something clever I can do so that when I call UActorComponent->Rename() on the server, clients can be made aware that the ownership has changed and to not Destroy along with the Actor?

Trying my best to illustrate the problem :^)

[normal garden]

Wrapping the Rename() inside of a NetMulticast, Reliable function resolves the issue but this seems incredibly sketchy

Another potential solution would be to make the InventoryItem owner some other Actor that is always relevant, that way Destroy() would never affect the InventoryItem to begin with..

[magic yoke]

I'm adding actor components to a replicated array. This crashes unreal instantly. If I turn off replication, it doesn't crash.

Has anyone had this bug before?

I can set the array in question fine, it's specifically when I try to add to it piecemeal that it crashes

(blueprints)

[normal garden]

are you checking IsValid() on the clients before accessing the members of the array?

[magic yoke]

that should give ma a printout saying access null

it shouldn't crash unreal itself

but yeah lemme do that

[normal garden]

no but if you are accessing a pointer that is not valid on the client you're likely getting a null pointer

[magic yoke]

right

but this doesn't give null pointers

it crashes the unreal editor entirely

lol

for curiosity's sake

I made it so the repnotify code doesn't do anything

still crashes

even though the replicated array isn't ever interacted with

[normal garden]

the repnotify would be on the client side, i would expect the replicated array to be interacted with from the server?

[twin juniper]

I dont understand whats going on here, when one client shoots it takes away ammo and adds screen shake to the other:

Does anyone know whats going on here?

[frosty remnant]

If you replicate an array of structs, does a change within a struct still trigger replication?

[normal garden]

if it's a UPROPERTY() it should

i think that's the case at least

[magic yoke]

it doesn't in blueprints by default it seems

still could be my code lemme recheck

[normal garden]

does anyone know if there is an Actor in the world that is replicated to all players by default?

[magic yoke]

gamestate

I believe character actors also

[normal garden]

thank you

[ornate pilot]

hey all, noob question but the count column in the network profiler tool is that a count of how many times a actor was checked for replication?

[normal garden]

https://docs.unrealengine.com/4.27/en-US/InteractiveExperiences/Networking/NetworkProfiler/

That sounds correct

Does it seem reasonable that the GameState Actor would be the owner (or maintain a list) of all UObjects in gameworld that represent Inventory Items?

[crystal crag]

APlayerState is always replicated and relevant using default settings I believe

Characters are replicated, but they have rules that determine relevance and will not always replicate (again, using default settings)

I haven't played with the replication graph, so that might completely change things; not sure.

[chrome bay]

No. By default the GameState owns nothing

[fathom aspen]

It was replicated** as told in the post. A specific actor is checked for replication on a fixed interval, and if the value did change then it replicates and that's what the count is

[ornate pilot]

So my next question is I should be trying lower the amount of times an actor is being checked for replication? I assume I can push updates via code with force net update?

[fathom aspen]

If your actor doesn't change stuff that much then that's something you should really be considering. Also ForceNetUpdate doesn't really force anything, all it does it resets LastTimeActorWasCheckedForReplication(I made up the name, can't remember what it's called)

What you can also consider is to use the PushModel, which lets you replicate stuff only when you want them to replicate, so there is no checking on an interval

Another thing you can do is make the actor Dormant and FlushNetDormancy when you want it to replicate(also if it doesn't really change that much), but that's far too extreme for what you want to do I assume

[dark edge]

Why are your items Actor components? That seems weird

[tawny torrent]

Is there a special trick to replicating arrays in BP?

Cant get it to work with a simple rep notify when adding stuff to the array.

[winged badger]

for starters, Unreal does funny stuff with Outers, which are not replicated

on clients, Outer tends to be the Actor that replicates the object via its ActorChannel, even if server has different ideas

note that you have not changed the Owner here, nor did you re-register the component

which i really wouldn't do anyways, as adventures like that that so often lead Unreal into undefined behavior

[winged badger]

install editor symbols for debugging if you haven't already and provide the assert + callstack from crash reporter

[winged badger]

given your adventures with Rename, im guessing you are using c++, if you want to go that way, have a AInventoryManager Actor, then use FFastArraySerializer to replicate the inventories - read NetSerialization.h header for documentation on it

[dark edge]

Are you meaning to have non-replicated units?

Holy necro lol, Just noticed that was 2 days ago. Anyway, are you meaning for your spawned actors to NOT be replicated?

[normal garden]

I considered using UObjects, but replication was already built-in for UActorComponents. AActors seemed wasteful since the objects won't always be visible

[normal garden]

Thank you I will check that out

[normal garden]

It certainly didn't feel like the best implementation, thanks for the feedback

[compact talon]

I am using seamless server travel and storing player information (such as skin choice and username) in the player state so it persists through level change.

I loop each player controller in the lobby, casting to the state and setting the information inside said state. Then when the level swaps and the player character is spawned it reads the information from the attached state to get the skin to use.

The issue is, this is only working for the host. The host will have their player information in the state from the lobby, but the client loses it.

I think I am not setting it correctly.

This is something that happens to all player controllers in the lobby before the server travels to the new map This is within the lobby gamemode BP

This is the player state BP and I use copy properties to copy the properties to the new state as the level changes

This is the player character, and on the server player it pulls the information set within the lobby gamemode.

For client's the circled red area doesn't have any information so it is using the default values

[fathom aspen]

Are you sure PlayerState isn't null for client? It takes time to replicate, and that could be an issue

I wouldn't wait for the info to replicate just to change some other info on the server side character. I would stay on the server and change all the stuff there

[compact talon]

I am not sure what you mean by this, as for your first line that could be an issue as I didn't consider it being "ready" to use on the client.

[fathom aspen]

Also BeginPlay runs on both server and client, so such code should have a switch has authority(remote pin) before it

[compact talon]

Is a switch has authority necessary if I want both the server and the remote clients to run the event?

[fathom aspen]

Yes that's what I meant, you can't assume it has replicated

[compact talon]

Yeah, I will quickly test that by adding just a long delay to see if it's the issue. I will need to package it tho because I cannot test server travel with PIE

[fathom aspen]

Well character exists on both server and client. So all characters in the game will have this code run on both

[compact talon]

oh I see, yeah that isn't what I want to happen

[fathom aspen]

It's not that if client 1(not the host) doesn't have a server instance of that character

[compact talon]

Yep. I understand what you mean now.

[fathom aspen]

You can do that, while as I said, I wouldn't run such logic on the client, for the replication issue and because it's unnecessary(not performant)

I would pull the info from the server side PlayerState and change the skin on the server side Character

[compact talon]

I see, to have that occur all I have to do is plug the last screenshot into authority instead of remote or is it not that simple?

[fathom aspen]

Plugging is first step. Second step is to get rid of that RPC(just run normal function). Third step, make sure that RemoveAllWidgets runs in Remote pin as it runs on clients as you see

[compact talon]

I see, as for running the normal function I am not sure if you mean the on client function instead of on server as I dont run the on server with authority?

This is that section of nodes

[fathom aspen]

Oh I see that's another problem. A skin is stateful event, it's not a transient one. Multicast events are transient not stateful

So changing a skin that way would be a problem if there's a player that's not relevant at the time the change occurs, and then becomes relevant

He won't see the new skin

Same thing for late joiners...

[compact talon]

I think I have something set for that, as late joiners do see the new skin

[fathom aspen]

Oh wait, I just saw that the texture is Replicated(RepNotify)

Ok that's why

So you don't need to Multicast

What you can do instead is just run a normal function that changes the skin and OnRepNotify change the skin for clients

[compact talon]

I see, and I call that function instead of the OnServer RPC

in the authority pin

[fathom aspen]

i.e, ChangeSkinOnServer make it a regular event

Correct

[compact talon]

Alright, let me try and get these changes and find someone to test them out. Thanks for the help

[compact talon]

@fathom aspen Alright, I figured something out with all this mucking about.

You are right with the switch on authority thing. I removed it to just test the delay and it changes the host skin fine and it changes the skin for the client for a few frames and then it resets. Presumably because, as you said, it is running the event twice on the player. One is right and one is wrong.

However I am not too sure as I tried changing the skin on authority and removing the widgets on client but it caused issues as the widget removal wouldn't occur on the host, and the skin wouldn't change at all. Which surprised

[compact talon]

This seems to have fixed it, not sure if its unoptimal but at least the skins and information are transferring properly

[fathom aspen]

Right RemoveAllWidgets is a BlueprintCosmetic so it doesn't run on dc server so it seems like it should still be run on listen server
As for changing the skin, did you set the texture/material on the mesh in the OnRepNotify function?

[compact talon]

Yes

[fathom aspen]

Can I see how you do it?

[compact talon]

or to be more clear, my base player creates a dynamic material instance on construct and changes the mesh to use it. Then on the repnotify I change the texture parameter for this material instance

sure

Construct

RepNotify

[fathom aspen]

Why do you SetMaterial each time the texture replicates back? Setting it one time should be enough

[compact talon]

¯_(ツ)_/¯

Good point, this is my first ue game so I am just kinda throwing stuff together that seems vaguely right and hoping it works lmao

[fathom aspen]

Haha it's okay, been there, though I would suggest to not roll with stuff because they "work" ^^

[compact talon]

I think when I did it, it was because setting the material in the construct wasn't replicating properly, so I set it on the rep notify as it calls the rep notify from the construct

[low helm]

Repnotify doesn't fire if a value hasn't changed

[compact talon]

I could perhaps check if its already valid/set though, and if it is then skip re-setting it or something

[low helm]

so his implementation is fine

[fathom aspen]

Yeah. The construction script has some gotchas. That's why I tend not to use it if I can

[low helm]

ehh nvm it is repetitive

on the first node

[compact talon]

Mostly using this game as a learning experience to learn the basics of a wide variety of topics in UE, such as blueprinting; GAS; multiplayer; online subsystems; how replication works etc.

Then I will get more advanced with these topics in my second game and hopefully by my third game I will have enough knowledge to consider releasing a game. These are just private learning experiences to play with my friends.

[fathom aspen]

Though setting same dynamic material instance each time the texture replicates is unnecessary

[fathom aspen]

You are on the right track. Learning by doing is great. Asking in this server when you're stuck is great too 😛

[compact talon]

I felt pretty intimidated starting with a party game but it's honestly a lot more relaxed than any other game. There will for sure be a ton of bad optimization but because it's a small party game they will never really see noticeable impact on performance in game.

Optimization is just such a huge daunting task that I want to spend a huge chunk of time learning it for my second game, as well as making high ping multiplayer feel less jank.

Anyways I am going to head to bed, it is 3am and I have work in the morning. Thanks for the help 🙂

[fathom aspen]

As for SetMaterial you can move it to BeginPlay I guess

[normal garden]

It looks like I can use this to provide more granularity as to what I am serializing. It's still a pretty thick read though, are there any examples I could look at to help me understand it better?

[winged badger]

they even have an implementation example in that header

[normal garden]

I saw that but it's super light

[winged badger]

you do need your FFastArraySerializerItem

which would probably have a pointer to the InventoryComponent, your FItemData or equivalent, and the inventory slot information

then on PostAdd/Change/Remove, it "contacts" the InventoryComponent it has a pointer to, and informs it of what has changed

obviously, all your InventoryComponents would have to register themselves with the AInventoryManager

and all of them would have to (on server) update their information in the fastarray on any change

[normal garden]

posting for reference

Still absorbing this in to my brain

[gritty flume]

No thats fine, i got it working as intended, the spawned actors are replicated

[dense thistle]

Can someone help me with a really basic question? im in a vc

[pallid mesa]

https://vorixo.github.io/devtricks/stateful-events-multiplayer/

[livid sluice]

Hi guys I have a quick question based on security.
When we say run on server, I know the code is exclusively run on the server. But does client have "visual" of this execution as well. I know this seems vague so let me give you an example.
Say I have an early access system and the keys for early access is saved on a server somewhere. If I wrote a "Run on server" function which obtains these keys from the database and checks it, will the client be able to access these keys for that time period as well? or is this completely happening on the server and the client had no idea what these keys are.

[chrome bay]

The client won't run any of that code

If you have dedicated servers and aren't shipping the server binaries to end-users, it's worth compiling the sensitive code out altogether.

[livid sluice]

Ah okay awesome thanks.

[glad escarp]

So this works out pretty nicely as far as camera functionality goes, but how does one make sure the gun is aimed where your FPS center screen is so that when you zoom in, its at the same point of aim? That is currently boggling my mind. And then how do you continue to control the camera's pitch?

[static flare]

Can I have an actor-instance stored in e.g. the GameState (without being spawned), have it replicated to all players, and let clients decide for themselves where and if it should be physically spawned for them?
And if that is possible, when playing on a listen-server and the host spawns it in their world, can I prevent this action from being replicated, while still replicating other properties on it?

[chrome bay]

Well you can't have a non-spawned instance, that makes no sense

And no you can't replicate it's properties if the actor itself is not replicated

You can just turn off replicated movement then move it where you want it to be client-side

Strange use-case though

[static flare]

Yeah.. It's a very client-authoritative game, where the dynamic world is built in runtime on client-side, and not necessarily the same part of the world as other clients (e.g. they're on two different planets). But there's always exactly one "home base" (one actor, with several sub-actors), which exists one place. All players must know of the base and its properties/states at all times, so I was hoping I could just instantiate the actor with NewObject in the GameState and then decide on client-side whether or not to spawn it (based on where you are in our own coordinate-system), and was hoping that it would be as easy as just saying something like BaseActor.SetWorld(GetWorld()) or something.
I was initially planning to create a thinner replicated data-layer struct describing the base, with all information necessary to reconstruct it anywhere, but I had to keep adding a bunch of information to it and would need a sort of diff-tool to avoid recreating it on every change, and got a lot of ugly hard-coded properties between building-actors and struct-layer, and in the end I felt like I was about to duplicate the entire Actor-lifecycle and re-invent the wheel so to speak.. Was hoping to just use the Actor.

[chrome bay]

No that's not going to work

You need to spawn the actor server-side and replicate it

NewObject won't even work with AActor derived types anyway

[blazing spruce]

Hi, is it okay to use this delay here? this is running on the game mode and gets called when players have loaded into the map, the player state cast sometimes fails on the first attempt because it can be called slightly before the players have loaded in, the full logic is I have a timer thats ran every 10 seconds checking if all players have loaded, if they are all loaded it'll then check to make sure we have the expected amount of players that travelled over from the pre lobby, if the expected amount of players are reached a pre game timer is started and the AssignTeams event is ran

[grizzled stirrup]

If you set NumPublicConnections to 3 when creating a session, it is impossible for more than 3 players to join a lobby?

Or do you have to manually disable joining in progress when 3 players have joined?

[winged badger]

you aim with the camera, then make a weapon fire at camera hit location

its slightly more complicated for TPS

as when close to an obstacle, the weapon shot can be blocked where camera shot isn't

but that is typically solved by drawing a red X widget where the weapon trace to camera hit location is blocked

[glad escarp]

Ok so this is how I would set it up as well for a weapon that actually fires a physical projectile too? I'm not currently using a line trace for firing because I'm just spawning a projectile actor at the muzzle location/rotation.

[winged badger]

then its camera trace and you set the bullet on its path to camera hit location

[glad escarp]

Ok. Makes sense. I'll figure that out. Thanks m8. Any suggestions on controlling the camera pitch? When I blend into the weapon camera, I lose the ability to pitch the camera though I still have control of yaw (through the player controller I assume.)

[spring tangle]

Hello! I have a beginner question - my characters are controlled using floating pawn movement but it seems like the client can't send inputs. I have tried putting the input axis value in a variable and using repnotify to actually call the movement code but it doesn't seem like my client is updating in any of these cases. Any tips? Thanks!

[lucid basin]

I followed a tutorial where you use ip but i when i send the package to my friend and gave him my public ip he did not connect. Thanks

[lucid basin]

anyone?

[silent valley]

You probably need to forward port 7777 on your router to your PC

[lucid basin]

Yeah but then i also need to put in an ip address

[silent valley]

You're best off following a tutorial on port forward but it will probably be your local lan IP address of your PC

[lucid basin]

so ipv4 or public?

btw is it only 7777 or are there more?

[silent valley]

say your IP is 192.168.0.90 you want the router to forward incoming connections on port 7777 to your machine which would be 192.168.0.90

[lucid basin]

so ipv4 or public?
is it only 7777 or are there more?

[silent valley]

7777 is all you need unless you have changed the port it is listening on

[lucid basin]

ok

btw TCP or UDP?

@silent valley

[silent valley]

UDP

[lucid basin]

ok

What are the differences if you know it

[silent valley]

between UDP and TCP? best off googling it, but they are quite different. fast paced games always use UDP

[lucid basin]

ok thanks

It did not work

@silent valley

[silent valley]

Sorry I'm about to go out, could be many things! Did you test on your local machine? Two clients.

Do you have another machine on the lan you could test with

So much can go wrong, you gotta simplify first

[lucid basin]

No. Im doing it with my friend over discord

[torn geode]

Hello, ive got a bug with raycasts and that they do not want to sync, is this a known issue and is there a fix?

(it is fully replicated but idk what ive done wrong lol)

never mind im just dumb i turned on componenet replicates on the scene componenet the raycast shoots from and now its working

[hardy surge]

hi there, i need to make a video chat inside android Unreal apk, its posible to do that? i know the android camera plugin, but i need replicate the video, its there a way to replicate render target? or material? and then use voice chat?, please i really ned help with this,i am able to pay for the help

[grizzled stirrup]

If your game requires solo play but also drop in / drop out multiplayer, is there no harm in just creating a private session whenever the user loads up the game and have it available should they decide to invite a friend? Or should sessions only be created when a multiplayer session is definitely desired? Listen servers in this case

[hardy surge]

no solo, multiplayer with two person, its a video chat like app more than a game

[dark edge]

We're doing a seamless drop in/out game and yes, in solo play you technically have a session.

The game is completely seamless from startup to shutdown except when joining another game.

[hexed pewter]

https://forums.unrealengine.com/docs?topic=506005
if I understood correctly this article from knowledge base says that subsystems are not ideal for multiplayer scenarions. Is there any kind of Specialized subsystem that does well in MP?

[grizzled stirrup]

Nice that sounds great! Thanks for sharing. I'll create a private session as normal when the player starts up the game and then I guess can easily make it public if they choose during the gameplay (for quickplay) or just let them play solo with it running

I'm not sure if bAllowJoinViaPresenceFriendsOnly and such can be updated on the fly or if a new session needs to be created, but will figure it out!

Worst case scenario they just destroy their current session and create a new one with the updated params. Just one last question on that, travel isn't mandatory for a new session to be created right?

As in they can load in to the starter map and create a session without having to travel to a new map with those session params? Sessions can be thought of separately to the actual gameplay / currently loaded world?

[glad escarp]

Dude. Syncing the third person mesh with the first person mesh in an FPS is a huge challenge. I must be trying to go about this all wrong lol.

[latent heart]

A huge challenge in what way?

[glad escarp]

Pitch in particular. I can't get the pitch of my third person gun to match the pitch of my first person gun so that the muzzle effects/projectile origin are the same. They are both in the wrong spot if I look up and down at all.

[latent heart]

When looking at the character from another client?

Or when you switch cameras?

[glad escarp]

when looking at the character from another client

[latent heart]

I'd have it constnatly dumping the pitch out to the log and see if they sync up.

On both clients

The pitch of the 1 specific character, not their own characters.

then you can find out if it's a view rotation problem or a skeletal one.

[glad escarp]

hmmmm. Yeah I can try that. Thanks

[fathom aspen]

Right, this is the only way I know of if you're project is BP only.
The clean and right way is to use OnRep_PlayerState from cpp

[tawny torrent]

Is there a special trick to replicating arrays in BP?
Cant get it to work with a simple rep notify when adding stuff to the array.

[dim parrot]

Hello I am working on an online survival game like ark or Conan and im trying to figure out the best way to save world data like player builds so it persists over server restarts

[fathom aspen]

After you add stuff the array you need to set the array

That's a known bug with stuff that are RepNotify in BP

[deep geode]

Does anyone know a tehnical document on how valorant does its hot registration?

[dark edge]

Savegames

[chrome bay]

No. The general practice is to use a world subsystem, and spawn an actor that handles the networking portion of it.

I've done this a couple of times, works nicely

[glad escarp]

Alright, solved the problem while in ADS. So here's the strange thing. It appears to be working while in ADS but not while in hipfire. The strange thing is that I don't have any different code controlling pitch while in ADS.

[latent heart]

I'm guessing you do! 🙂

[glad escarp]

I'm using a Trasform (Modify) Bone node in my anim graph which is modifying spine_02. The Layered Blend Per Bone nodes that control the hipfire and the ADS poses are both set from spine_02....

so I don't know what's going on

[latent heart]

Is it a pitch value issue?

[glad escarp]

haha I mean it would stand to reason but I'm going through the code again and again and I am not modifying the way in which the controller is rotating while in ADS

[latent heart]

Or a skeleton issue?

[glad escarp]

Looks like pitch. From another client looking at the guns, they are in the same position and same rotation/pitch. But in the first person view, the weapon is rotating up as well as the camera. I must have something in the code that is locally rotating my gun or fps arms mesh

hmm.... I can't find anything unless set world rotation propogates to children by default or something. I'm not specifically altering the rotation of the gun mesh anywhere... Just the camera that it is a child of.

[glad escarp]

So, I thought it might be because I'm limiting the angle of the camera but I checked the camera rotation against the adjusted control rotation values and they are identical lol. This is baffling.

[blissful totem]

I wouldn't replicate the widgets. I would replicate the player name in the player states and have the widgets read the player name from that locally on each client

[pallid mesa]

https://vorixo.github.io/devtricks/stateful-events-multiplayer/

I quote

The values of our replicated variables are sent by the server to the incoming connections, so if a new player becomes relevant to us, they will set our replicated variables to the incoming values.

Essentially, Multicast and Client RPC’s are for one-off events, meaning that they don’t persist any state. New connections have no clue which RPCs were sent recently.

[obsidian cargo]

BenUI has a really good video about networking on his site that covers this. 3rd video down by Omid Kiarostami https://benui.ca/unreal/notgdc-2022/

[pallid mesa]

the article i sent covers in fact that specific issue

[crystal crag]

I wonder why Epic didn't use their new motion warping in lyra when using melee

Is anything stopping us from using motion warping while running an ability?

Or maybe it's because it's not the best approach just for what they were trying to achieve and it has nothing to do with whether or not motion warping can be used in an ability graph

[quasi tide]

So - spawn an actor that talks to the world subsystem?

[jade iron]

hey everyone,
Is there anyone here that has experience using a custom server to manage game state and connecting a UE 5 client to it? I am currently porting over everything from unity

[glad escarp]

I think I know what it is but I have no idea at all how to solve it.

So the first person camera is a child of the capsule component. It inherits its rotation from the controller directly. And it's pivot is in a different place than the pivot point of the third person mesh's spine_02 which means even though they are technically pivoting at the exact same angles, they will never match.

And I don't think that parenting the FPS camera to the third person mesh is gonna be a good option because then my camera will inherit all the movement of the character's animations, which I don't want.

[charred crane]

I have a replicated actor containing a 3d widget and a sphere collision. When a pawn overlaps with the sphere collision, I want the widget to be visible only to that pawn. Any ideas?

[glad escarp]

Confirmed it. I attached the FPS arms to the TPS Mesh and it rotates exactly as it should.

But that's not a solution. Hmmm

[latent heart]

I always kind of assumed the FP arms would be like "gloves" that go onto the TP skeleton.

Shrug

[fathom aspen]

Make the pawn own that actor, and then SetOwnerOnlySee on the 3d widget component

When the pawn leaves the sphere you can un-own the actor

Yes sounds like a crazy solution, but can't think of anything else, as I haven't done such a thing before.
Well another thing you can do is make that actor only relevant to that pawn and not to the other pawns

That can be done overriding IsNetRelevantFor

[charred crane]

Hmm. i must be doing something wrong

[neon mango]

As is tradition

I follow said tradition a lot as well

If its only to the local pawn then shouldn't a local event that tells the widget to be created be enough?

[charred crane]

Here's a picture of what's going on

client doesn't see anything. server sees anyone overlapping

Here's the logic

I feel like there's some sort of checks related to ownership or local control or something that needs to be done to fix it

[spark ivy]

Hi guys what avatar plug-in do you guys like the best for human avatar players? I currently have Character customizer

[fathom aspen]

Can more than one player see that widget?

[fathom aspen]

You would also prolly want to make the actor itself OnlyRelevantToOwner. But anyways if more than one player can see the widget, then you shouldn't be going this route

[charred crane]

Yeah so the idea is that anyone who is within the radius of the sphere collision can see it.

[fathom aspen]

Yeah then the owner thingy won't work for you. Only one owner at the time can be there

What you can do is have that widget component attached to the player instead with OnlyOwnerSee as default. And when you overlap that sphere you activate the widget component(it starts deactivated)

[neon mango]

Yeah I'm trying to figure out how to basically do only owner see for just one pawn, not for all of them

So inside my GameMode On PostLogin I have a bool that is supposed to be set to true after one trigger of the post game login and yet it stays false each post login ? https://gyazo.com/c5cb27855c47e2437f203eec4b76e5cb

Only two player, listen and one client. Post login called twice, both times its false

I just moved it to game instance and it works now but that is confusing

[fathom aspen]

That shouldn't be the case. You are probably changing it back to false somewhere else

[neon mango]

Nope

But thanks for confirming it should not be the case

[fathom aspen]

o7

[neon mango]

Its doing it do all variables inside game mode and I think that is why I have issues :/

moving them all to game instance for now as a work around but yeah I don't think that should happen like that

Maybe its an editor debug thing, IDK atm

[ionic arch]

Does anyone have any idea where to find AWS SDK for Unreal Engine 5

[chrome bay]

Yeah. The subsystem spawns an actor, and that manages the network data

[pallid mesa]

world subsystems live in the server, right?

[chrome bay]

All connections for me

The manager acts as the accessor to the system, the actor registers itself with it when it's received so anybody can easily access the state. Most of the logic is in the manager, the actor just replicates the state

Similar to how GameMode/GameState work

Difference is that the "Mode" actor is the Manager and it exists on all connections, and you access the "State" through it

But the two are coupled

[pallid mesa]

manager is the actor, here, right?

but you mentioned the world subsys spawns the actor

or does the actor exist in the world and fetches the subsystem on received beginplay?

i think it wouldn't matter much in this case

[chrome bay]

No the manager is the subsystem

[pallid mesa]

ah! okay

[chrome bay]

The idea being it's always going to exist when you need it client-side, so you don't need to worry about race issues

And it pushes out events when the state actor is received

My command system does quite a lot of that since it keeps track of commanders, commandable objects, the global command "state" and each "division" actor as well

pencils in another blog to write up

[livid mist]

Does anyone know why my multiplayer would stop working when I enable "DefaultPlatformService=Steam" instead of NULL? If it's on NULL it works fine but as soon as I try to use steam, game hosting stops working completely. I've searched for days and can't find the answer. 😦

You can test a game and play together via steam with the default app ID, can't you?

I'm also using the Advanced Sessions plugin on UE5 but not sure if that matters.

[pallid mesa]

🤣

still working on the initialization blog post, right?

[chrome bay]

yeah, got a few in progress

[pallid mesa]

gotta do the release party

🥳

[glad escarp]

That would make sense but then you need to parent your camera to the TP skeleton too and then you're gonna inherit all that animation movement which isn't necessarily ideal.

[kind ermine]

HI everyone im using blueprints to host session and join on lan ..its not able to find session...i dont know what im doing wrong here

[neon mango]

Does set view target with blend change possession of controller to the other pawn?

[chrome bay]

no

[quasi tide]

Ohhhh - so, the subsystem spawns it. Alright. That's what I thought at first but it saying the subsystem doesn't have network stuff made me think, for some reason, that the subsystem couldn't have anything that replicates, actor included. So - the server spawns it and it'll auto spawn on the client side like normal, right?

[chrome bay]

yeah

Then the actor can register itself with the subsystem when it arrives client-side

So it's accessible from anywhere easily

[safe marsh]

hi, I am trying to do some quick MP debugging - I can connect to a dedicated server locally when its built

but if I launch it as a separate process from editor I cant connect with open localhost open 127.0.0.1

[dark edge]

There's a good middle ground. Launch it from command line or with a batch file. Sec, I'll get mine

[safe marsh]

I am using Launch Seperate Server to launch a dedicated during PIE, but Standalone wont connect to it

is there some extra parameter I need to add?

[dark edge]

IDK, PIE can get fucky. You unchecked single process?

[safe marsh]

yeah, its not once process, its opened up the same map, but the dedicated it launches doesnt even seem to listen for connection requests

[charred crane]

When you say attached to the player, which player do you mean? The actor is spawned and attached to a player who fulfills a condition, then when another player gets close to the one with the actor, it should become visible only to the one who is close, not the person it’s attached to.

[dark edge]

@safe marshJust make a couple batch files like this and try it
Client

 "C:\Program Files\Epic Games\UE_5.0\Engine\Binaries\Win64\UnrealEditor.exe" "%CD%\Islandgame.uproject" MainMap -game -nosteam

Server

 "C:\Program Files\Epic Games\UE_5.0\Engine\Binaries\Win64\UnrealEditor.exe" "%CD%\Islandgame.uproject" MainMap -server -log -nosteam

[safe marsh]

thanks, I can try that but it will need to build it, right?

[dark edge]

No

its the same as right clicking the uproject file and hitting launch game

or just launching the game

except its launching as server

[safe marsh]

@dark edge I solved it, needed to add the port as PIE server doesnt use default port >_<

but thanks for that, will try it for automation later

[neon mango]

Using VRExpansion, I added the ReplicatedVRCamera and that replicated to clients fine, then I added the Replicated Motion Controllers and now the ReplicatedVRCamera doesn't update its transform for clients

[safe marsh]

you can try asking in the vrexp discord server, not sure how to fix that issue sorry

[dark edge]

Ahow some code and we can look

[winged badger]

all instances of every character on every machine call BeginPlay

also, you should use a HUD derived class for widget manipulation

unlike the Character, its there only for the locally controlled PC

[pastel totem]

Hey I have a question regarding Seamless Travel. The players stay connected to the session when travelling to another map right?
Is there a way to check if all players have finished loading the new map? I want to wait for all players before starting the match.

[winged badger]

AGameMode::NumTravellingPlayers will be 0 when they all load

[pastel totem]

Damn, totally overlooked this. Thanks!

[fathom aspen]

Well this isn't what I understood first time. Anyways, I'm not sure what you're trying to achieve. and prolly you're over complicating things the way you're doing them right now, but you would want to look more into relevancy checks, and trying to override IsNetRelevantFor(I don't think that's viable in BP though).

[charred crane]

I figured it out. I had to pass the actor reference to my third person character through a client RPC and set the visibility on it there.

I needed to get the local clients replicated version of the actor

[fathom aspen]

Though Client RPCs are for transient stuff, so that might make you issues down the line.

[fathom aspen]

See here, and read that post

[charred crane]

not really clear on how that could cause me an issue

[fathom aspen]

But I'm guessing you want only the client to be able to see it, so that might not be an issue

[swift pulsar]

Hello, I'm having recurring problem with this - can I set replicated variable on the server only and expect it to be set on clients? It doesn't seem to work. I have to set it via multicast...

[ornate pilot]

Afternoon, a quick question. what is the the Red box that appears next to Channel ReceivedRawBunch in StatNet? Is this a problem?

[short void]

Question, is there documentation for these project settings anywhere?

I cannot find anything

[dark edge]

Not really as far as I know. If you dig around in the source code it's pretty well commented though.

The basics are that you have a function to accumulate an error value, and you hard snap if it gets too high. While it's low, you gently ease to match the server's position and velocity

[pallid mesa]

the actor needs to be replicated

[swift pulsar]

It is. I usually end up using RepNotify instead, it always works.

[pallid mesa]

also careful multicasts are for transient stuff

repnotifies are there only if u need behav when the value changes

[swift pulsar]

Yes, my problem this time was probably caused by the fact that I tried to access replicated variable on the client when it wasn't yet set.

Desynchro issue, I guess.

[pallid mesa]

oh yes totally that's a nice race

[swift pulsar]

: )

[pallid mesa]

not necessarily desync, more like... latency existing 🤣

our worst enemy

[swift pulsar]

Yeah

[pallid mesa]

but be careful, you can shoot ur knee very easily with some programming patterns

[swift pulsar]

As a rule of thumb, I try to use multicasts only for VFX and SFX.

But this replicated var being null on client keeps returning. 🙂 But I guess it's about latency, as you say. That's why it's often solved by using RepNotify + OnRep combo.

[patent hatch]

i have an actore where "Send json" are call and "update data" don't want, (call from owning client) have idea why?

[river dome]

Hey guys if only my server is able to move and recieve input what could be the issue then? 😄

[ember sinew]

How do people test their multiplayer code (specifically with a listen server and one or more clients?) I tried testing in editor with 2 players and one as the listen server... but then behavior is different compared to running two instances of a standalone build on the same machine... but when playing two instances on the same machine, whatever window is not in focus caps it's framerate so testing the client means everything replicated is super choppy and unreliable.

[magic yoke]

if listen server vs solo server is giving different behaviours

it means you've got a replication issue, things aren't properly being replicated

I've been testing everything on client only, because that way you know for sure you're not making mistakes with replication since the listen server can "cheat" since it's a client that has authority (no other clients will have authority)

[jovial pike]

I would love some help regarding replicating a door with a dotproduct variable. Everything obviously works for server but clientside the door opens based on where the servers dotproduct float is.

heres my blueprint/ and function

how do I get the client's dotproduct to replicate to the server?

[magic yoke]

what is the dotproduct in this case?

[jovial pike]

the position of the player based on their proximity to door

[magic yoke]

oh there it is

so you want to tell the server where the player is

right?

[jovial pike]

yes/ that way the dotproduct variable tells the door which way to open

[magic yoke]

so the server doesn't know where your character is

?

seems strange that there's a desync there

[ember sinew]

I meant more specifically in editor - things like singletons or other actor references (sometimes when server-spawned, sometimes not) - behave differently than two separate running builds. I did have some replication issues - but I didn't find out until testing in separate builds because those issues weren't present when testing in editor.

[jovial pike]

I honestly dont know

those numbers are what the printstring reflects

[magic yoke]

you can always just do an RPC that tells the server directly what the relevant value is

but it seems to me that you're calculating the server side info wrong somehow

[jovial pike]

Oh I definitley am haha

[magic yoke]

the server knows where characters/pawns are

if you calculated it right server side, the dot product should be what you see client side or very close barring a bit of lag

so sending the dot product over via RPC would bandaid the issue

but underlying there's something else going on

btw

"get player character 0"

[jovial pike]

Thats what Im trying to figure out by asking. If someone could review the blueprint _ I can provide better quality images

[magic yoke]

is a bit of an issue server side

since only client 1 is considered player 0

that's my first concern

if your player ref is set wrong, that'd wreck your dotproduct server side

since it'd always be calculating it from client 1's pawn

[jovial pike]

how do I fix that?