#multiplayer | Unreal Source | Page 611

fading smelt Jan 21, 2021, 11:21 AM

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ok

winged badger Jan 21, 2021, 11:21 AM

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in the above example, MissionObjectiveActor being replicated itself

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is enough for it to show on clients as well

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so minimap system doesn't need to be aware that the game is multiplayer

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which simplifies stuff quite a bit

fading smelt Jan 21, 2021, 11:27 AM

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So my minimap manager just receives a info about MinimapComponents (Markers) from server and display them on my map?

winged badger Jan 21, 2021, 11:27 AM

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it doesn't receive anything from the server

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if you put a MinimapComponent on an Actor

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if that Actor exists on client, its MinimapComponent will register with MinimapManager locally

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no networking involved

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the only conditions required for an Actor to show on minimap

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1 - Actor is either replicated or loaded from the package (preplaced on map)

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and 2 - Actor has the MinimapComponent on the CDO (added to its class) or a MinimapComponent spawned and added on server, replicated

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spawning them at runtime is rarely, if ever required

fading smelt Jan 21, 2021, 11:33 AM

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ok

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thx

plush wave Jan 21, 2021, 11:54 AM

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How do replicated components on an actor work if they are created dynamically in the construction script?

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Should only the server create the components?

winged badger Jan 21, 2021, 11:55 AM

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if they ar erplicated, yes

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otherwise you'll end up with 2 client side

plush wave Jan 21, 2021, 12:09 PM

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Ok good to know

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if (HasAuthority() && MyComponent->IsSetToReplicateByDefault == true)
{
  // Spawn the component
}

winged badger Jan 21, 2021, 12:29 PM

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that looks wrong, either you're murdering the naming conventions or IsSetToReplicateByDefault is missing ()

novel topaz Jan 21, 2021, 1:09 PM

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Can someone help me please ? How can my client connect to dedicated server with program? I had Google around and found that they all mention about console command. Are there any C++ APIs do the same jobs?

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I also try console commands such as “open 123.456.789.0” in editor, but it didn’t work.

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My dedicated server is on a Linux machine with public IP#

winged badger Jan 21, 2021, 1:13 PM

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that one takes in the port number as well

novel topaz Jan 21, 2021, 1:15 PM

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the default port is 7777 if I don’t specify?

thin stratus Jan 21, 2021, 1:18 PM

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Unless you start more than one, then it increments

novel topaz Jan 21, 2021, 1:18 PM

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novel topaz the default port is 7777 if I don’t specify?

The official documents is lack of detail, I can”t event find any command examples in it

winged badger Jan 21, 2021, 1:19 PM

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“open 123.456.789.0:7777”

novel topaz Jan 21, 2021, 1:20 PM

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thin stratus Unless you start more than one, then it increments

No, I just start one process on server. I do search in the log to make sure the exact port

novel topaz Jan 21, 2021, 1:20 PM

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winged badger “open 123.456.789.0:7777”

Can I use this in PIE ?

thin stratus Jan 21, 2021, 1:21 PM

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You don't want to connect from PIE to anything outside of PIE

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If you need to connect to a packaged server, at least use Standalone

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Or just simulate the dediServer in the editor

novel topaz Jan 21, 2021, 1:22 PM

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thin stratus You don't want to connect from PIE to anything outside of PIE

Thank you, I will try it in standalone

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And are there the C APIs can do the same jobs?

thin stratus Jan 21, 2021, 1:23 PM

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C APIs?

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You mean C++ code?

novel topaz Jan 21, 2021, 1:23 PM

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Yes,

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C++ or BP

thin stratus Jan 21, 2021, 1:23 PM

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Yeah, I think that's done via PlayerController->ClientTravel or so

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BPs need the ConsoleCommand one, cause Epic doesn't like BPs people and Multiplayer :D

novel topaz Jan 21, 2021, 1:28 PM

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Where can I find some detailed documents?

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Or the only choice is diving into the source code...

peak sentinel Jan 21, 2021, 2:07 PM

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AnyNonReplicatedFunction()
{
GetOwner()->GetActorTransform().GetLocation(); // returns the location where I am
}

Server_Function()
{
GetOwner()->GetActorTransform().GetLocation(); // returns where I spawned first, even if I am not there
}

Anyone knows why this is happening?

meager spade Jan 21, 2021, 2:08 PM

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then your server and client version have different locations

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likely cause ReplicateMovement is false

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and they spawned at different location

peak sentinel Jan 21, 2021, 2:10 PM

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I tried to read how ReplicateMovement is connected with owners transform but couldnt find anything relevant, since I am trying to handle the prediction and smoothing manually I disabled ReplicateMovement. Looks like I need to manually inform server about my location

meager spade Jan 21, 2021, 2:17 PM

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well ofc

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server wont move unless client tells it, and vice versa

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if client moves, it needs to tell server it moved

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server can then relay that to simulated proxies

dapper spoke Jan 21, 2021, 2:43 PM

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Hello,

For the game I'm working, I need that the RPCs are served through TCP.
I saw that UIpNetDriver is responsible for the RPC communication and it creates the UDP socket, using the function UIpNetDriver::CreateAndBindSocket.

I'm wondering if the correct way to do what I need is override UIpNetDriver and so the function UIpNetDriver::CreateAndBindSocket: then create the TCP socket and that's it.

Is this fine? There is a better/easier way to do it?

chrome bay Jan 21, 2021, 2:52 PM

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Why would you want TCP?

dapper spoke Jan 21, 2021, 2:55 PM

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It's a long story 🙂

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I saw that there is an Android module that uses a TCP socket to send messages: ITcpMessagingModule. Is that used to make the editor communicate with the device?

silent valley Jan 21, 2021, 3:17 PM

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Sorry - I think I've seen this kind of question before but I can't find a resolution. I'm trying to use server travel for multiplayer testing and the problem is the client disconnects everytime the server travels.
I'm issuing server travel via gameMode->ProcessServerTravel() anyone know if this is the correct method?
fwiw I have dedicated server and client connected

chrome bay Jan 21, 2021, 3:18 PM

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@dapper spoke ultimately you cna't use TCP for game traffic/replication. If you want a custom TCP connection a socket is the way to go

dapper spoke Jan 21, 2021, 3:20 PM

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@chrome bay So I can't convert the current UE4 rpc API to use TCP. Ok thanks.

meager spade Jan 21, 2021, 3:28 PM

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@silent valley you should be using GetWorld()->ServerTravel

silent valley Jan 21, 2021, 3:29 PM

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thanks - yeah I tried that also - I get the same result...

meager spade Jan 21, 2021, 3:29 PM

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and your calling it on server only right?

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cause clients should not call it

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ah nvm

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its GameMode, sorry kinda working and hopping here at same time

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so brain gets muddled a bit

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normally travel issues throw logs

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what does the log say

silent valley Jan 21, 2021, 3:32 PM

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Yeah so I call it on server, then in the log it says LogGameMode: ProcessServerTravel
but then it prints a bunch of LogNet output:

LogNet: UChannel::ReceivedSequencedBunch: Bunch.bClose == true. ChIndex == 0. Calling ConditionalCleanUp.
LogNet: UChannel::CleanUp: ChIndex == 0. Closing connection. [UChannel] ChIndex: 0, Closing: 0 [UNetConnection] Re
LogNet: UNetConnection::Close: [UNetConnection] RemoteAddr: 172.17.36.65:53008, Name: IpConnection_0, Driver: Game
LogNet: UChannel::Close: Sending CloseBunch. ChIndex == 0. Name: [UChannel] ChIndex: 0, Closing: 0 [UNetConnection

then it tearsdown the old map and I get this which looks suspicious:

LogNet: World NetDriver shutdown IpNetDriver_1 [GameNetDriver]
LogNet: DestroyNamedNetDriver IpNetDriver_1 [GameNetDriver]
LogExit: GameNetDriver IpNetDriver_1 shut down

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on the client it reports that the host has closed the connection

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Maybe I should try this on a new project...

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according to the docs World->ServerTravel() is the correct way, but I also tried gamemode->ProcessServerTravel() too - same problem

marble gazelle Jan 21, 2021, 3:51 PM

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have you setup a transition map?

silent valley Jan 21, 2021, 3:56 PM

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no, as this is for automated testing I thought there was no need for seamless

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but maybe Seamless is required to actually work?

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I can try and set one up

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although seamless travel is false on my gamemode

bitter oriole Jan 21, 2021, 4:17 PM

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Seamless travel is pretty much required

hazy herald Jan 21, 2021, 6:20 PM

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does steamworks still require the user to port forward for p2p?

meager spade Jan 21, 2021, 6:52 PM

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steam handles nat punch through

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you connect to them using the steam id

bitter oriole Jan 21, 2021, 7:11 PM

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@hazy herald It never did, AFAIK

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Well, "never" is a big word

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It hasn't required it for at least a decade

hazy herald Jan 21, 2021, 7:17 PM

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alright thanks @meager spade @bitter oriole i never used it so i was just making sure before i dived in

gritty pelican Jan 21, 2021, 8:04 PM

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do i need set ComponentReplciated in UActorComponent? if i need to replicate variable?

dark edge Jan 21, 2021, 8:07 PM

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gritty pelican do i need set ComponentReplciated in UActorComponent? if i need to replicate var...

I'm pretty sure the component has to replicate for it's variables to replicate.

gritty pelican Jan 21, 2021, 8:09 PM

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okay

fresh chasm Jan 21, 2021, 8:40 PM

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Hello there, I am trying to get a notification on the server to know when the client has connected and is able to execute code on its end on an ActorComponent. The method I am currently using is to send an RPC from the client, during ActorComponent's BeginPlay. Is this the right method? Or is it possible to know this directly from the server (without using RPC)?

dark edge Jan 21, 2021, 8:44 PM

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There's some sort of function you can override in the connection process but I guarantee you don't want to do it on begin play.

fresh chasm Jan 21, 2021, 9:00 PM

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Something like AGameModeBase::PostLogin ? It is possible that the client did not "create" the ActorComponent at this moment, right?
(I basically need to replicate variables from server to client, to initialize it with the correct values, but I can't use the Variable Replication system because I'm dealing with arrays)

green moat Jan 21, 2021, 9:27 PM

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Why is dynamodb so popular with ue? I much prefer postgres

fluid summit Jan 21, 2021, 11:17 PM

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Hi! newbie looking for advice. i want to make an arpg with some building features (top down look like LOL maybe, with upgradeable building, etc) i want to have offline features and later, maybe, add some multiplayer features (like instance dungeons and stuff) should i just start everything on server or build all offline and then adapt it to the multiplayer features?

dark edge Jan 21, 2021, 11:51 PM

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@fluid summit build with multiplayer in mind.

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A well-built game for multiplayer can play in single player without you noticing a difference. You just need to architect things in a certain way such that it behaves well whether you are the server or client

vocal cargo Jan 22, 2021, 12:26 AM

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Can anyone recommend me somewhere I can look that explains how multiplayer should be organized?

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i.e., how to divide input/logic, HUD, all that

tranquil yoke Jan 22, 2021, 12:52 AM

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Anyone had this issue with , SSL Protocol Error, using CloudFront, only on Android ?

green moat Jan 22, 2021, 1:10 AM

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vocal cargo Can anyone recommend me somewhere I can look that explains how multiplayer shoul...

https://www.youtube.com/watch?v=a8ukx6nPub0&ab_channel=underscore this is a good video series, there's quite a few out there. The graph at 2:15 is particularly good to know when you're first starting and will get you passed some things you will inevitably run into on your own and not know why.

YouTube

underscore

UE4 Tutorial: Multiplayer Replication (Part 1)

An introduction to multiplayer replication in Unreal Engine 4. In this video, learn some basic techniques to effectively produce multiplayer mechanics involving server and client logic. Topics covered: Blueprint scripting, level blueprints, RPCs (Remote Procedure Calls).

LINKS:
Part 2 - https://youtu.be/TuyLaN3FJGo
UE4 Network Compendium - htt...

▶ Play video

green moat Jan 22, 2021, 1:12 AM

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vocal cargo Can anyone recommend me somewhere I can look that explains how multiplayer shoul...

https://www.youtube.com/watch?v=GcZQ2o6LpDI&ab_channel=RyanLaleyGames and https://www.youtube.com/watch?v=1hzcLMnZ3eI&ab_channel=DevAddict looks cool too

YouTube

Ryan Laley Games

Unreal Engine 4 Tutorial - Online Multiplayer Part 1: Replication

In this series we will be explaining how to add online multiplayer to your games. First we are going to explain how it works, then we will go into creating lobbies etc.

In Part 1 we begin with the basics, explaining how replication works, how to test online multiplayer, and how to add sprinting to your online game.

Support me on Patreon and ge...

▶ Play video

YouTube

DevAddict

Unreal Engine 4.26 Multiplayer Tutorial for Beginners: Platformer Game

Continue learning multiplayer with my Unreal Engine 4 courses right here: https://devaddict.teachable.com

This new Unreal Engine 4.26 beginner's multiplayer tutorial is continuing with the blueprint Platformer game we created in my previous tutorial. However, you don't necessarily need that to learn from this video. But, I do recommend going th...

▶ Play video

fervent yacht Jan 22, 2021, 1:46 AM

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If you do C++ the gamedev one will get you running, but it's rougher than DevAddict. More thorough on the why's though.

gray scroll Jan 22, 2021, 1:48 AM

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if i launch as 2 players

slim matrix Jan 22, 2021, 2:36 AM

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How would I make multiple servers under one main server for LAN and detected servers so players that connect join he main level but can travel to sub servers that have different levels

lost inlet Jan 22, 2021, 3:16 AM

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that could mean all sorts of different things

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you might want to be more specific

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unless you want a game module or something that's only compiled into dedicated server builds

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?

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I would get very familiar with the UE4 replication system before you even think about making a dedicated server build

hollow eagle Jan 22, 2021, 4:13 AM

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The only reason you need source for a dedicated server is because epic decided not to provide binaries for dedicated server builds of the engine

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that's it

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you don't need a separate project, you don't need to do anything special aside from changing the build config to dedicated server

quick flint Jan 22, 2021, 5:05 AM

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why is my OnRep function (ReplicatedUsing) not being called

lost inlet Jan 22, 2021, 5:12 AM

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you'll have to show what you're doing

quick flint Jan 22, 2021, 5:20 AM

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UPROPERTY(BlueprintReadOnly, ReplicatedUsing = OnRep_ResourceCount)
    int32 ResourcesCount;

    UFUNCTION()
    void OnRep_ResourceCount();```

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

    

    // Resource Count
    DOREPLIFETIME(AHVS_Character, ResourcesCount);
}

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{
    UpdateResourceCount();
}```

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And inside of UpdateResourceCount is a blueprint implementable function

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i added breakpoints

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nothing gets triggered

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@lost inlet

lost inlet Jan 22, 2021, 5:23 AM

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are you updating the value on the client? the client won't call the onrep if the client version is the same as the networked version unless you explicitly say not to do that

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and to be sure, you selected "play as client" in the editor right?

summer tide Jan 22, 2021, 5:29 AM

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So let's say I've a weather system which shows effects and particles to all the players. How could that be modified so that the weather is shown to players who are only within certain areas. Let's say I have trigger voume for different biomes. Based on that diff weather is shown to diff players within diff biomes.

steel vault Jan 22, 2021, 5:41 AM

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You just answered your own question didn’t you? Trigger volumes to show weather per area.

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None of that is replicated. All of it is handled client side when entering the volume.

spark steppe Jan 22, 2021, 7:48 AM

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Hey everyone, so I'm having trouble replicating attaching a cable to the grappling hook. (Basically I'm spawning a projectile and attach a cable to it) The server attaches the cable with no problem and everyone can see it properly attached but clients can't, they attach it to the origin of the player. It probably has to do with spawning the grapple on the server and not the client but I'm not sure how to fix it so everyone can see each other attached to their own grappling hook. I would appreciate any help!

📎 unknown.png

quick flint Jan 22, 2021, 12:24 PM

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lost inlet are you updating the value on the client? the client won't call the onrep if the...

void AHVS_Character::AddResources(int32 Amount, class AHVS_ItemPickup* ResourceItem)
{
#if WITH_SERVER_CODE

    if (ResourcesCount >= NumResourcesForLevelUp)
    {
        return;
    }

    ResourcesCount += Amount;
    if (IsValid(ResourceItem))
    {
        ResourceItem->Destroy();
    }

    if (ResourcesCount >= NumResourcesForLevelUp)
    {
        Client_ShowLevelUpUI();
    }

#endif
}```

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So I have this function which is called on the server

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shouldn't OnRep be called every time ResourcesCount is changed?

chrome bay Jan 22, 2021, 12:38 PM

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Everytime it's received, that's the difference

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You won't necessarily receive every change to a variable, just the final state of it

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OnRep's are also only called (by default) if the received value doesn't match the current value. You can override that behavior to call the OnRep anytime the client receives it though.

meager fable Jan 22, 2021, 12:42 PM

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spark steppe Hey everyone, so I'm having trouble replicating attaching a cable to the grappli...

Is your grappling hook actor replicated? Actors only spawn on the clients if they are replicated

quick flint Jan 22, 2021, 12:45 PM

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@chrome bay so in my case, why is it not updating do you think

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I've set this up the same way for many other variables

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and they all work

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I figured it out

atomic acorn Jan 22, 2021, 2:45 PM

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@chrome bay how do I override this behaviour?

chrome bay Jan 22, 2021, 2:56 PM

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DOREPLIFETIME_CONDITION_NOTIFY(SomeActor, SomeProperty, COND_None, REPNOTIFY_Always);

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REPNOTIFY_Always being the key part

atomic acorn Jan 22, 2021, 3:01 PM

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Cheers man

silent valley Jan 22, 2021, 3:44 PM

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bitter oriole Seamless travel is pretty much required

Setting bUseSeamlessTravel to true has fixed my problem - so apparently non seamless travel just doesn't work anymore

bitter oriole Jan 22, 2021, 3:45 PM

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Well it works, it's just expected to lose clients along the way, if that was the problem

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Depending on how fast the server brings the new level up etc

chrome bay Jan 22, 2021, 3:54 PM

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yeah I think in practice hard travel has few use cases

winged badger Jan 22, 2021, 3:56 PM

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seamless is superior in every way, except complexity

silent valley Jan 22, 2021, 3:58 PM

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it would be nice if the docs mentioned this >.<

chrome bay Jan 22, 2021, 4:00 PM

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to be honest most platforms only really work with seamless anyway. Steam for example

bitter oriole Jan 22, 2021, 4:10 PM

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The docs mention it

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"It is recommended that UE4 multiplayer games use seamless travel when possible"

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Third line on the page that explains the travel system

silent valley Jan 22, 2021, 4:12 PM

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I guess, when I read the Travel page it seemed to me that Seamless travel was a progression, to be explored to improve the experience.

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However the reality is it just doesn't work unless you use seamless. I tried it on a brand new project from 3rd person template and it just disconnects the clients.

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setting that bool to true is all that's required to fix it though

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should just be true by default 😂

bitter oriole Jan 22, 2021, 4:14 PM

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Yes, it does disconnect the clients, that's a given

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It's always going to do that

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The clients then reconnect

silent valley Jan 22, 2021, 4:20 PM

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that doesn't happen

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maybe it's broken?

bitter oriole Jan 22, 2021, 4:21 PM

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How did you test ?

silent valley Jan 22, 2021, 4:21 PM

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brand new project on 4.26, Listen server 2 players, server changes map client is left disconnected

bitter oriole Jan 22, 2021, 4:21 PM

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How did you test

silent valley Jan 22, 2021, 4:21 PM

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PIE in this case

bitter oriole Jan 22, 2021, 4:22 PM

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Yeah, try real game instances first

silent valley Jan 22, 2021, 4:22 PM

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console ServerTravel newmap

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well I also tried instances and many many other things

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over the past day

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it was only a couple hours ago I tried on a blank project

bitter oriole Jan 22, 2021, 4:22 PM

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Feel free to report a bug if you think you found one !

silent valley Jan 22, 2021, 4:22 PM

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the clients disconnect but dont try to reconnect

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🤔 yeah maybe I should

gritty pelican Jan 22, 2021, 4:29 PM

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do i need to use Implementation for ReplicatedUsing?

UPROPERTY(ReplicatedUsing = OnRep_QuickSlots, BlueprintReadWrite, EditAnywhere)
        TArray<FInventoryItem> QuickSlots;

    UFUNCTION()
        void OnRep_QuickSlots();
        void OnRep_QuickSlots_Implementation();

#

void UCPP_InventoryComponent::OnRep_QuickSlots_Implementation()
{
}

silent valley Jan 22, 2021, 4:30 PM

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no you don't need the _Implementation function in header or CPP

gritty pelican Jan 22, 2021, 4:30 PM

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and for native event to?

UFUNCTION(BlueprintNativeEvent)
        void InventorySlotsUpdated();
        void InventorySlotsUpdated_Implementation();

silent valley Jan 22, 2021, 4:38 PM

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in that case no need to mention _Implementation version in header, but it must exist in cpp

shut gyro Jan 22, 2021, 4:52 PM

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Gravity enabled does not work on the listen server's remote proxy for me - which is role authority - why would this be the case?

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Let me clarify - it is true but it doesn't move the tanks down on the listen server's screen

bitter oriole Jan 22, 2021, 4:59 PM

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"Remote proxy" ?

shut gyro Jan 22, 2021, 5:02 PM

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There is no proxy on the server, let me rephrase that - it is just set to Role_Authority

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The Remote role is simulated proxy

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Actually I think it actually is being activated, but for some reason my integrator is making the hover tank go to the desired location very very slowly so its not multiplayer it seems like actually

hollow eagle Jan 22, 2021, 6:44 PM

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There are some performance considerations to think about in dedicated vs listen scenarios (for example, do you really need to run animations on a dedicated server if they aren't gameplay-affecting?) but there's no difference in how you setup your project.

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and, provided you aren't doing anything "dumb" like assuming there's always a local client, anything that works on a listen server should just work on a dedicated server

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performance considerations like I mentioned are not necessary and are more about making dedicated servers run as lightweight as possible

ember needle Jan 22, 2021, 6:46 PM

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I'm getting this:

ClientAdjustPosition_Implementation could not resolve the new relative movement base

when the client walks on blueprint meshes. if the server walks on them, all ok. The BP holding the meshes is replicated.
Has anyone seen this behavior? Where can I start looking?

hollow eagle Jan 22, 2021, 7:04 PM

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connecting to a dedicated server isn't any different from connecting to a listen server.
Hosting is different - for a listen server you'd have some ui that loads a player into a level with listen server enabled, a dedicated server would be something hosted by itself on some machine with some configs/command line to tell it what to load.
There are functions to tell whether a process is a dedicated server too, but it shouldn't be that common to change actual game code behavior based on that.

gritty pelican Jan 22, 2021, 7:04 PM

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how i can replicate ControlRotation?

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Replicate FRotator?

west oxide Jan 22, 2021, 7:18 PM

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hey everyone, im trying to let a dedicated server generate a random map and then loaded both on server and clients. Problem is i want to use HierarchicalInstancedStaticMeshComponents and i have read that HISMs/ISMs arent replicated and therefore im getting following errors when stepping on HISMs:
UPackageMapClient::InternalLoadObject: Unable to resolve default guid from client: PathName: HierarchicalInstancedStaticMeshComponent_2147482464, ObjOuter: /Game/Maps/Server/Lobby.Lobby:PersistentLevel.HISMActor_2
I also read that using MakeUniqueObjectName could solve this problem but i couldnt figure out how. apparently the server doesnt know the HISMs on client side. is there any way that the server knows the reference? maybe @ember osprey could help? ive seen you had also a replication problem with ISMs

cunning relic Jan 22, 2021, 7:29 PM

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Quick question: When I call LoadStreamLevel on the server it loads the sublevel on the server and all the clients (which is what I want), but I'd like to have the server wait until all clients have also finished loading the sublevel before continue. Anyone have an idea how to do this?

ember osprey Jan 22, 2021, 8:20 PM

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west oxide hey everyone, im trying to let a dedicated server generate a random map and then...

Yo YO! I had to make an ISM manager to control the instances on each client.

west oxide Jan 22, 2021, 8:24 PM

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ember osprey Yo YO! I had to make an ISM manager to control the instances on each client.

ok, could you explain that a little bit more in detail?

ember osprey Jan 22, 2021, 8:25 PM

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Yeah, I have an ISM manager actor sitting in the level that creates instances at runtime.

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Each one client has its own ISM manager that mimics/simulates what it should be seeing from every other connected client.

karmic briar Jan 22, 2021, 8:28 PM

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What's ism manager

ember osprey Jan 22, 2021, 8:28 PM

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Its my actor that manages ISMs

west oxide Jan 22, 2021, 8:29 PM

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ember osprey Each one client has its own ISM manager that mimics/simulates what it should be ...

i have an actor which is placed in the level and creates for both server and clients the instances of HISMs. what do i need to add?

ember osprey Jan 22, 2021, 8:29 PM

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ISMs don't replicate

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so why on the server?

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Are you creating instances at runtime?

west oxide Jan 22, 2021, 8:30 PM

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because the server calculates the collision i thought?

west oxide Jan 22, 2021, 8:31 PM

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ember osprey Are you creating instances at runtime?

yes

ember osprey Jan 22, 2021, 8:31 PM

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But ISM won't replicate.

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its in the docs.

meager spade Jan 22, 2021, 8:31 PM

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^

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we do it by passing a seed the server creates to all clients

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and clients build the level, and notify server when its doen

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seed means clients build the exact same as the server

ember osprey Jan 22, 2021, 8:32 PM

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that could work for some cases.

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My use case is way different. lol

meager spade Jan 22, 2021, 8:32 PM

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if your randomizing

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but he is randomizing

ember osprey Jan 22, 2021, 8:32 PM

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Still same principle though

meager spade Jan 22, 2021, 8:32 PM

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so he requires a seed that ALL have

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and it must match

ember osprey Jan 22, 2021, 8:32 PM

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client needs to create the ISM some way

west oxide Jan 22, 2021, 8:32 PM

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yes, but doesnt the server also has to create the HISMs?

meager spade Jan 22, 2021, 8:33 PM

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yes for server side collisions

west oxide Jan 22, 2021, 8:33 PM

#

its created the same way on server and all clients

ember osprey Jan 22, 2021, 8:34 PM

#

@west oxide so you are doing level creation ISM stuff?

west oxide Jan 22, 2021, 8:34 PM

#

yes

ember osprey Jan 22, 2021, 8:34 PM

#

ok, I'm not.

#

But the client needing to create the actual physical representation of the ISM is the same situation.

west oxide Jan 22, 2021, 8:36 PM

#

meager spade and clients build the level, and notify server when its doen

so the clients have to notify the server so it knows that their HISMs are the same?

ember osprey Jan 22, 2021, 8:36 PM

#

What Kaos is saying is use the seed from the server and pass it to an ISM manager on each client the client will build an exact match of the level across all clients.

#

Does this make sense? @west oxide

ember needle Jan 22, 2021, 8:37 PM

#

After further investigation, I am stumped. I hope some network gurus can help me out.

I have a replicated BP that contains a static mesh as floor. This BP is inside of a streaming level.
Well... when the instance of the streaming level is generated, for some reason the network guid of the static mesh is not replicated (Unable to resolve default guid from client) so clients walking on the static mesh floor get a ClientAdjustPosition_Implementation could not resolve the new relative movement base actor.

is this known? If I spawn the mesh after the streaming level is loaded all goes well... :S

LogNetPackageMap: Warning: UPackageMapClient::InternalLoadObject: Unable to resolve default guid from client: PathName: /Game/MyGame/Maps/TCELevel_0, ObjOuter: NULL 
LogNetPlayerMovement: Warning: ClientAdjustPosition_Implementation could not resolve the new relative movement base actor, ignoring server correction! Client currently at world location X=-1346.734 Y=-140.878 Z=94.150 on base FEC_S_HatchHoleEndFloor

west oxide Jan 22, 2021, 8:38 PM

#

thats what im doing. but somehow the server doesnt know that the HISMs instances on clients are the same as on the server i think

ember osprey Jan 22, 2021, 8:54 PM

#

I believe so.

bitter oriole Jan 22, 2021, 8:57 PM

#

Yes

ember osprey Jan 22, 2021, 8:57 PM

#

UFUNCTION()
virtual void OnRep_MaxStamina(const FGameplayAttributeData& OldMaxStamina);```

steel vault Jan 22, 2021, 10:00 PM

#

When you're a listen server, you're a server. Servers don't receive OnRep callbacks unless written in BP, and even then they're probably not supposed to.

#

It will say above the window

#

If you mean in code, then you use if checks such as HasAuthority() or what people in here prefer more is a netmode check.

hollow eagle Jan 22, 2021, 10:08 PM

#

most of the time checking authority is all that matters

steel vault Jan 22, 2021, 10:09 PM

#

I personally have been just fine checking authority.

hollow eagle Jan 22, 2021, 10:09 PM

#

netmode is mostly relevant if you're trying to turn certain features off for dedicated servers

#

99% of the time you don't need to think about that

#

I said it before - pretty much the only difference you need to worry about with a dedicated server is whether you want to turn off certain things for performance reasons.

#

and that the dedicated server doesn't have a local player (which shouldn't matter... just don't write code assuming you have a local player)

steel vault Jan 22, 2021, 10:10 PM

#

I'd start with HasAuthority() and narrow down cases in the future where it looks like you need more granular checks.

hollow eagle Jan 22, 2021, 10:13 PM

#

You're thinking about it wrong

#

let's say you have an onrep property float MyFloat

#

it calls OnRep_MyFloatChanged

#

let's say you want to change MyFloat to some value

#

don't just set it

#

instead, have a function SetMyFloat(float NewValue) which does two things

#

first, it sets the value

#

second, it calls OnRep manually because the local system, regardless of whether its a client or server, will not have OnRep called

#

void AMyActor::SetMyFloat(float NewValue)
{
  MyFloat = NewValue;
  OnRep_MyFloatChanged();
}

something like that

#

in that way, every time you change your property the onrep gets called regardless of whether your a server, client, remote, local, etc

meager spade Jan 22, 2021, 10:17 PM

#

I dislike calling onrep but it's so convenient

#

I normally run that through another function

hollow eagle Jan 22, 2021, 10:18 PM

#

You could just have an extra function that onrep (and SetMyFloat) calls

#

yeah

#

however you want to do it

#

comes down to the same thing though

meager spade Jan 22, 2021, 10:18 PM

#

Yh

winged badger Jan 22, 2021, 10:20 PM

#

the other way around

#

you have a Set function you call on server, and also from OnRep

#

while OnRep itself just calls the Set

#

i prefer that approach, as it keeps the clutter in networked functions to a minimum

#

and also, breakpoint won't hit OnRep on server, ever, that way

#

so i don't have to dig for role/netmode or check callstack to know if im on client or server when that breakpoiont hits

#

which speeds debugging

odd sundial Jan 22, 2021, 10:45 PM

#

Hey all!

I'm having a bitch of a time.... I spawn this hologram actor (have a pointer for it, Holo_Base) on a server RPC.

When I go to destroy it, it only gets destroyed if the player is the server... if a client player goes to have it destroyed (via the HideHologram server rpc), it doesn't.

The actor and the pointer are both set to replicated.

Can anyone help me?

void ASpy::SpawnHologramBase()
{
    Server_SpawnHologramBase();
}

void ASpy::Server_SpawnHologramBase_Implementation()
{
    if (HasAuthority())
    {
        if (Hologram_Base)
        {
            FActorSpawnParameters SpawnParams;

            //spawn the hologram and have Holo_Base as it's pointer
            Holo_Base = nullptr;
            Holo_Base = GetWorld()->SpawnActor<AActor>(Hologram_Base, FVector::ZeroVector, FRotator::ZeroRotator, SpawnParams);

            //attach the hologram base to the left wrist of the spy socket
            Holo_Base->AttachToComponent(GetMesh(), FAttachmentTransformRules::SnapToTargetNotIncludingScale, "LeftWristHackSocket");

            //...begin the hacking countdown
            HackCountdown();

        }
    }
}


void ASpy::HideHackingHologram()
{
    if (HasAuthority())
    {
        Holo_Base->SetActorHiddenInGame(true);
        Holo_Base->Destroy();
    }
    else
    {
        Server_HideHackingHologram();
    }
}

void ASpy::Server_HideHackingHologram_Implementation()
{
    HideHackingHologram();
}```

winged badger Jan 22, 2021, 10:45 PM

#

3 backticks suggestion, Kaos? 😄

meager spade Jan 22, 2021, 10:45 PM

#

@odd sundial use three ` not a single one, and consider using pastebin for big code blocks

odd sundial Jan 22, 2021, 10:46 PM

#

Ah, I used two

#

let me try this again

winged badger Jan 22, 2021, 10:46 PM

#

edit it

meager spade Jan 22, 2021, 10:46 PM

#

😄

odd sundial Jan 22, 2021, 10:46 PM

#

Done! 🙂

meager spade Jan 22, 2021, 10:47 PM

#

what is ASpy?

odd sundial Jan 22, 2021, 10:47 PM

#

It's a character, played by the player

winged badger Jan 22, 2021, 10:47 PM

#

why do you spawn a HoloBase only if one already exists?

odd sundial Jan 22, 2021, 10:47 PM

#

Hologram_Base is the actor subclass that I want to spawn

#

Holo_Base is the pointer to the spawned actor

meager spade Jan 22, 2021, 10:48 PM

#

yeah your naming is ambigious

#

HologramBaseClass will be better

odd sundial Jan 22, 2021, 10:48 PM

#

Good point, that makes sense

winged badger Jan 22, 2021, 10:48 PM

#

or just HologramClass

#

as it doesn't necessarily hold a base class ref

meager spade Jan 22, 2021, 10:49 PM

#

anyway back to the issue at hand, is the hologram actor replicated? Also setting hidden in game before calling destroy is pointless

#

normally only do that if you SetLifespan

odd sundial Jan 22, 2021, 10:50 PM

#

It is replicated, yes. It's set in the actor BP and I also set it via the pointer after it's spawned, just in case

#

I actually only did the hidden thing in game to see if it had any effect (it doesn't)

meager spade Jan 22, 2021, 10:50 PM

#

what happens if you spawn 2 holograms?

#

one of them will never get destroyed

#

you have no gating on if a hologram already exists

odd sundial Jan 22, 2021, 10:51 PM

#

The hologram only appears during a little hacking minigame and disappears after an animation is done

meager spade Jan 22, 2021, 10:51 PM

#

yeah but what if i press input twice

odd sundial Jan 22, 2021, 10:51 PM

#

during which it's impossible to go to another place to spawn another hologram

winged badger Jan 22, 2021, 10:51 PM

#

why would you RPC it then?

meager spade Jan 22, 2021, 10:51 PM

#

one of those holograms will get stuck

winged badger Jan 22, 2021, 10:51 PM

#

or keep respawning it?

odd sundial Jan 22, 2021, 10:52 PM

#

Pressing input twice is fine, this method of spawning the hologram is called from a completely separate function that starts the minigame

#

it can really only be spawned once

winged badger Jan 22, 2021, 10:53 PM

#

yeah, it should be spawned once the way you described it

odd sundial Jan 22, 2021, 10:53 PM

#

winged badger why would you RPC it then?

I don't understand, I spawned it because it's a multiplayer game and I need it's presence to be replicated to other players

winged badger Jan 22, 2021, 10:53 PM

#

around BeginPlay

#

attached to the character

#

and just hidden when not required

#

no point in respawning the thing

odd sundial Jan 22, 2021, 10:54 PM

#

Well the actor itself is a series of particles and whatnot, and so I want that particle effect to play out the way it's designed

#

If I just set it to unhidden, the particles would just appear out of nowhere I think

winged badger Jan 22, 2021, 10:54 PM

#

unless you were to reset the emitter

meager spade Jan 22, 2021, 10:55 PM

#

i mean spawning actor is fine

odd sundial Jan 22, 2021, 10:55 PM

#

Regardless, let's say this was .... anything else.

#

I'm wondering what the issue is in replicating it's destruction

meager spade Jan 22, 2021, 10:55 PM

#

DestroyActor is replicated

#

so the issue is something else

odd sundial Jan 22, 2021, 10:56 PM

#

I mean... it has to have something to do with the fact that if I even set the value to hidden by the server it has no effect

#

I could try multicasting it's destruction but I know that's not really the proper way

winged badger Jan 22, 2021, 10:57 PM

#

well, there is always the possibility that you have more then 1

odd sundial Jan 22, 2021, 10:57 PM

#

I will triple check that right now

winged badger Jan 22, 2021, 10:57 PM

#

with breakpoints

odd sundial Jan 22, 2021, 11:00 PM

#

Yep only one is spawned

#

Oh wait a second

#

On my server player it spawns one...

#

on a client it spawns two

#

At least there are two in the world outliner

#

Dammit...

#

that's it

#

what the heck happened

#

Two get spawned during hacking if you're playing as a client, only one if you're a server

meager spade Jan 22, 2021, 11:06 PM

#

{
    Server_SpawnHologramBase();
}

void ASpy::Server_SpawnHologramBase_Implementation()
{
        if (HologramClass && !Hologram)
        {
            FActorSpawnParameters SpawnParams;

            //spawn the hologram and have Holo_Base as it's pointer
            Hologram = GetWorld()->SpawnActor<AActor>(Hologram_Base, FVector::ZeroVector, FRotator::ZeroRotator, SpawnParams);

            //attach the hologram base to the left wrist of the spy socket
            Hologram->AttachToComponent(GetMesh(), FAttachmentTransformRules::SnapToTargetNotIncludingScale, "LeftWristHackSocket");

            //...begin the hacking countdown
            HackCountdown();
        }
}


void ASpy::HideHackingHologram()
{
       Server_HideHackingHologram();
}

void ASpy::Server_HideHackingHologram_Implementation()
{
  if (Hologram)
  {
      Hologram->Destroy();
  }
}```

odd sundial Jan 22, 2021, 11:08 PM

#

Gonna try that fix... I'm sure that'll be the answer... I still don't understand it but

#

Brutal..

#

Thank you

#

Dammmnn that was it

#

How did this happen?

#

What a lesson....

#

thank you

#

I constantly get red squiggles in visual studio when I’m using RPCs... don’t know why, but I find they eventually correct

hollow eagle Jan 22, 2021, 11:16 PM

#

turn off intellisense error squiggles or get VAX/Resharper

#

or use rider

peak sentinel Jan 22, 2021, 11:20 PM

#

Rider is free until 2021 Jun

rose dock Jan 23, 2021, 1:30 AM

#

How do people usually handle a case like this:
I want to spawn a (replicated) actor in the server, and then immediately (or at least, as soon as possible) call a client RPC with that actor as a parameter?

#

If I immediately call the RPC, the client receives a null pointer to the actor because it isn't yet replicated

dull lance Jan 23, 2021, 1:50 AM

#

^ have a Replicated Structure / Variable that Replicates using a Ufunction (RepNotify). Set this variable replication condition to Initial Only

#

@rose dock

#

The value that you set this variable to is the parameter

vocal cargo Jan 23, 2021, 4:45 AM

#

Hey everyone, any idea why I have no issues on the editor but running the game on a dedicated server crashes?

#

it's complaining about line 278:

📎 unknown.png

#

no errors or logs in the editor

meager spade Jan 23, 2021, 4:46 AM

#

That seems fine

#

You must have had a crash report or callstack

vocal cargo Jan 23, 2021, 4:49 AM

#

this?

📎 unknown.png

#

I am also getting a bunch of LogModelComponent: Model /Game/Maps/EventLevels/EventLevel.PrivateEventLevel:PersistentLevel.ModelComponent_0 has elements that reference missing vertices. MaxVertex=259, NumModelVertices=0 on the server startup, not sure if it's a problem

meager spade Jan 23, 2021, 4:50 AM

#

275 would not crash hmm

#

Is that the helm comp ?

vocal cargo Jan 23, 2021, 4:50 AM

#

275 used to be that setting of the bool

#

if added the if (MainHelm) to be sure

meager spade Jan 23, 2021, 4:51 AM

#

So you modified it since the crash

#

Or that crash happend with that code ?

vocal cargo Jan 23, 2021, 4:51 AM

#

I did modified it, added the if (MainHelm)

#

crash is now at 278

meager spade Jan 23, 2021, 4:52 AM

#

That would not crash

cosmic trail Jan 23, 2021, 4:52 AM

#

maybe is not actually valid or garbage pointer?

meager spade Jan 23, 2021, 4:52 AM

#

Well the cast would have chucked it out

vocal cargo Jan 23, 2021, 4:52 AM

#

huh, should I UPROPERTY() it?

meager spade Jan 23, 2021, 4:52 AM

#

In the cpp file ?

vocal cargo Jan 23, 2021, 4:53 AM

#

doesnt the UPROPERTY() make sure the variables dont get garbage collected?

meager spade Jan 23, 2021, 4:53 AM

#

Only on the heap

vocal cargo Jan 23, 2021, 4:53 AM

#

but yea, the check should've been enoguh

meager spade Jan 23, 2021, 4:53 AM

#

Ie in your header

#

Is your mainhelmtrigger uproperty?

cosmic trail Jan 23, 2021, 4:54 AM

#

just in case, the MainHelmTrigger is checked but MainHelmText is set, check MainHelmText too?

meager spade Jan 23, 2021, 4:54 AM

#

Yeah that is what I was thinking

#

Mainhelmtext is likely null or garbage

#

I said trigger but I mean text lol

#

Does it have uproperty above it ?

vocal cargo Jan 23, 2021, 4:55 AM

#

    UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = Default, meta = (AllowPrivateAccess = "true"))
        class UTextRenderComponent* MainHelmText;

meager spade Jan 23, 2021, 4:55 AM

#

Server can t have that

#

So you need to take that out on server

#

Server has no renderer

#

That component will likely be null on server

vocal cargo Jan 23, 2021, 4:56 AM

#

huh didn't know that

#

but if I check it

#

wouldn't that prevent the crash?

meager spade Jan 23, 2021, 4:56 AM

#

Your checking trigger

#

Not text

vocal cargo Jan 23, 2021, 4:57 AM

#

technically

meager spade Jan 23, 2021, 4:57 AM

#

Change that if to text

vocal cargo Jan 23, 2021, 4:57 AM

#

oh lol

#

you're rightr

#

let me check that

meager spade Jan 23, 2021, 4:57 AM

#

That is 100 percent your crash

vocal cargo Jan 23, 2021, 4:58 AM

#

Damn it I've been looking in the wrong place for a few hours..

#

yikes

cosmic trail Jan 23, 2021, 4:58 AM

#

Line numbers can be fiddly

#

especially with optimizations

vocal cargo Jan 23, 2021, 4:58 AM

#

I'd just appreciate it would warn me in the editor too 😬

meager spade Jan 23, 2021, 4:59 AM

#

Why would it ?

cosmic trail Jan 23, 2021, 4:59 AM

#

well it would just work in editor yeah? cuz text always exist

vocal cargo Jan 23, 2021, 5:00 AM

#

doesn't it run an instance of the dedicated server?

meager spade Jan 23, 2021, 5:00 AM

#

Yes but it does not compile stuff out

#

When you build dedicated server it strips a lot of stuff out

#

Special define #WITH_SERVER

cosmic trail Jan 23, 2021, 5:01 AM

#

Is there a way to link two actors, each spawned separately from server/client to then bind their replication or something? I have some data heavy initialization that I would just do locally on the client and server, but then still have them replicate from server afterwards

meager spade Jan 23, 2021, 5:02 AM

#

Set them not replicated build the data then replicate that actor. One thing tho it must exist on the level for thst to work pr you spawn it with a net stable name and do some hackery

#

Or override prereplicate and disable replication of properties till a condition is met

#

Either way

winged badger Jan 23, 2021, 5:03 AM

#

net stable hackery is a bit of an overkill here

meager spade Jan 23, 2021, 5:04 AM

#

Yeah that is why I said the other option

#

Would work just as well

cosmic trail Jan 23, 2021, 5:04 AM

#

Ok, thank you, will try to override pre-rep then

winged badger Jan 23, 2021, 5:05 AM

#

or reorganize the data

cosmic trail Jan 23, 2021, 5:05 AM

#

yeah I also can cache the data

winged badger Jan 23, 2021, 5:05 AM

#

you can pull all static data separately

cosmic trail Jan 23, 2021, 5:05 AM

#

and then fill it on rep

#

gonna check out pre-rep to see how it works more too tho, seems like something to know

winged badger Jan 23, 2021, 5:05 AM

#

we do all our abilities, weapons and whatnot

#

initialized after game starts

#

and almost nothing actually replicated

cosmic trail Jan 23, 2021, 5:06 AM

#

yeah, makes sense for very static data

winged badger Jan 23, 2021, 5:07 AM

#

and if its not "very static"

cosmic trail Jan 23, 2021, 5:07 AM

#

but have to go out of your way to actually set that up

winged badger Jan 23, 2021, 5:07 AM

#

you can just replicate the bit which tells it where to pull from

cosmic trail Jan 23, 2021, 5:07 AM

#

the perfromance is worth it for you I assume

winged badger Jan 23, 2021, 5:07 AM

#

pairing actors in replication after they have been spawned separately on client and server

#

not a trivial undertaking

cosmic trail Jan 23, 2021, 5:08 AM

#

must have a lot of data/actors haha

winged badger Jan 23, 2021, 5:08 AM

#

we spawn 30k of them in that manner

#

so no real choice

cosmic trail Jan 23, 2021, 5:08 AM

#

geez ok yeah I can totally see why that would be worth it

winged badger Jan 23, 2021, 5:09 AM

#

replicating them by hand would just not work

vocal cargo Jan 23, 2021, 5:16 AM

#

really appreciate all the help from everyone in the server especially @winged badger and @meager spade

#

you guys help a ton of users immensely, I see it all the time

meager spade Jan 23, 2021, 5:16 AM

#

No problems :p

#

Yeah we are nice guys

tidal venture Jan 23, 2021, 8:24 AM

#

Hi, I have a problem that I realise I didn't face when playing in client, but I do when playing in listen server and I'm wondering if anyone had this problem before.

I have a problem with attachComponentToActor. My pawn has 2 meshes, one for First person and another for Third person. When my player switch weapon, I call the event on the server which cast to all my client to attach to the correct mesh (either the TPS or FPS).

Whatever I do, when call on the server, the result of the client get override. I know it makes sense since the actor is replicated, but I wonder if they is some kind of way to let the server keep is result and make sure the client doesn't replicate the attachment and keep his own behaviour

silent valley Jan 23, 2021, 8:33 AM

#

If you replicate a proxy object (either weapon index, weapon class pointer, etc) instead of the Mesh, then the clients can have an OnRep function and set the mesh themselves based on their current setting.

cinder quartz Jan 23, 2021, 8:33 AM

#

Use 2 weapon meshes, or override OnRep_Owner or OnRep_AttachmentSomething and check if it's local player

tidal venture Jan 23, 2021, 8:38 AM

#

@silent valley The mesh is not replicated, the whole actor is

#

@cinder quartz I didn't consider using two meshes, it might just work! I was already looking if it's local player by the way, the default mesh attach simply get replicated by itself when the actor that hold it is set to replicate

#

@cinder quartz actually even if I create another mesh, the actor still replicated, so when I attach it, the same behaviour will hapen 😦

#

I guess I need to make sure the "second mesh" is independent from the actor that is replicated

#

that could work

cinder quartz Jan 23, 2021, 8:44 AM

#

If you have two meshes, you can try attach the weapon actor to 3rd person hand mesh, then attach the first person mesh component to 1st person hand on server

tidal venture Jan 23, 2021, 8:45 AM

#

This is already what I'm doing

#

they respectively get attach to the good socket and SK, the problem is when the server does it, it revert the client

cinder quartz Jan 23, 2021, 8:46 AM

#

okay, attach the actor to 3rd person mesh hand, then override OnRep_Owner and then attach the other mesh to 1st person hand in client side

#

but you need c++ to override it I think, shootergame has example how to do it

tidal venture Jan 23, 2021, 8:47 AM

#

I think it might be an obligation, the problem is that it's a full blueprint project for the marketplace :p

cinder quartz Jan 23, 2021, 8:48 AM

#

you need to somehow know on client that he just got a gun in his hand, then snap the other mesh to other hand

tidal venture Jan 23, 2021, 8:49 AM

#

this logic is running fine technically, the client only receive operation to change according to is situation

#

may I ask

#

when you say override OnRep_Owner, I'm not sure I follow you

#

I don't have any of this or I'm overlooking it

cinder quartz Jan 23, 2021, 8:51 AM

#

it's a funtion that gets called when server does "SetOwner(newOwner" https://docs.unrealengine.com/en-US/API/Runtime/Engine/GameFramework/AActor/OnRep_Owner/index.html

AActor::OnRep_Owner

Called when owner changes, does nothing by default but can be overridden

#

so usually when you pick up the gun, you set the gun's owner as the player who picked it up

tidal venture Jan 23, 2021, 8:51 AM

#

it only happen on construction, the weapon need to exist everywhere, how this can help me?

cinder quartz Jan 23, 2021, 8:52 AM

#

like the gun is never dropped?

#

it's always attached to same player?

tidal venture Jan 23, 2021, 8:52 AM

#

technically yes (when I drop I simply spawn a new weapon in the world)

cinder quartz Jan 23, 2021, 8:52 AM

#

hmm but then someone else can pick it up and needs to do the attachment stuff again

tidal venture Jan 23, 2021, 8:53 AM

#

this scenerio doesn't matter, if I can fix the gun switch, that would imply everything around it

#

So I know the concept around onRep_notify, but I never use the OnRep_Owner, and it doesn't seem to be available to bp?

cinder quartz Jan 23, 2021, 8:54 AM

#

Might not be, I'm not sure actually

tidal venture Jan 23, 2021, 8:55 AM

#

can't find anything about it. Anyway, there is no way this can help me, as this only is relevant when the game start on construction and it has nothing to do with the attachment itself

#

(except for c++)

cinder quartz Jan 23, 2021, 8:56 AM

#

well, the logic for weapons usually is: pickup weapon, attach it, then hide it when you switch weapons, unhide when you switch to it again, so you need to attach it correctly only once, unless you want to do stuff like show weapon on your back when it's not in your hand

tidal venture Jan 23, 2021, 8:57 AM

#

This is the logic for one skeletal mesh and almost the same for two sk, everything you mention, I'm doing it. It simply get override by the server

#

take a look

#

📎 unknown.png

cinder quartz Jan 23, 2021, 8:58 AM

#

I know, I had the same problem once, and the solution was to override OnRep_Owner and snap the 1st person meshComponent to firstPersonHandMesh

tidal venture Jan 23, 2021, 8:59 AM

#

I can only rely on blueprint for this project. And I'm still not seing in which way that could help me.

cinder quartz Jan 23, 2021, 8:59 AM

#

try https://docs.unrealengine.com/en-US/API/Runtime/Engine/Components/USceneComponent/AttachToComponent/index.html on your other mesh

USceneComponent::AttachToComponent

Attach this component to another scene component, optionally at a named socket.

tidal venture Jan 23, 2021, 8:59 AM

#

(the variable at the very elft is the pawn)

cinder quartz Jan 23, 2021, 8:59 AM

#

note its AttachComponentToComponent, the other one is AttachActorToComponent

tidal venture Jan 23, 2021, 9:00 AM

#

I tried both already

#

it get replicated anyway

#

(to put you in context, I'm quite use to Unreal, so this small thing make me crazy aha)

cinder quartz Jan 23, 2021, 9:01 AM

#

it's just how the engine automatically replicates attachments, sometimes it works against you

tidal venture Jan 23, 2021, 9:01 AM

#

I know, have to find out the solution

#

I have one in mind, but I do not like it.

#

having a secondary actor that simply old the aesthetic and that is not replicated.

cinder quartz Jan 23, 2021, 9:02 AM

#

or just have all your gun meshes as components, attached to firstperson hand and make it visible when you have a gun in your hand

tidal venture Jan 23, 2021, 9:03 AM

#

you mean, dissociate the gun mesh from the weapon blueprint right?

#

I would technically have the same problem since if the mesh is attach to my pawn (which is replicated), the attachToComp would be replicated as well

cinder quartz Jan 23, 2021, 9:05 AM

#

I mean, you would have your gun Actor that has one mesh, attach it to 3rd person mesh serverSide, then do the firstPerson mesh stuff client side

tidal venture Jan 23, 2021, 9:05 AM

#

I got it

#

thank you

#

Enough talk, thank for your time and enjoy your day/night 😄

vapid magnet Jan 23, 2021, 2:52 PM

#

I've heard that the Character is much heavier on the network than Pawn replication-wise. Is that actually true, and how big is the difference?

meager spade Jan 23, 2021, 2:53 PM

#

well it is because it has a bit more stuff

#

but it also has the CMC which handles predictive movement.

vapid magnet Jan 23, 2021, 2:56 PM

#

Im not sure I need all that extra stuff, as I am just working on the typical top-down turn-based RPG prototype.

#

But I also wont be handling a crazy number of characters at once, hence why I am trying to gauge which is better in my case.

meager spade Jan 23, 2021, 3:00 PM

#

if its multiplayer, then you will need to make your own movement system

#

if you don't use CMC

vapid magnet Jan 23, 2021, 3:01 PM

#

I assumed as much, but are there no other in-built replicated movement components?

#

besides CMC

peak sentinel Jan 23, 2021, 3:23 PM

#

In P2P up to 50 CMC's you can have a good time, unless you are doing other heavy stuff on networking

#

In dedicated with small (or medium) amount of changes in CMC (Kaos can explain better i guess) you can manage to lower the CPU usage of CMC to have 100+ characters

#

CMC has 7-8 variables (most of them structs) replicated and most of them should be with condition, and prorably more than 5-6 RPCs on Tick

#

@vapid magnet

vapid magnet Jan 23, 2021, 3:27 PM

#

In P2P up to 50 CMC's you can have a good time
assuming they all move/do stuff at the same time?

peak sentinel Jan 23, 2021, 3:28 PM

#

Yeah

#

I am working on a small horde-shooter game which had 50 zombies running around with CMC

#

From Ukraine to USA didnt have problems

vapid magnet Jan 23, 2021, 3:28 PM

#

thats reassuring

peak sentinel Jan 23, 2021, 3:28 PM

#

But now I am working on a custom movement component to have 200+ zombies at one time

#

CPU is still gonna be problem tho, even if you make your own component

#

Because you run tons of stuff running on Tick

vapid magnet Jan 23, 2021, 3:29 PM

#

im going turn-based for now, so it should be fine

peak sentinel Jan 23, 2021, 3:29 PM

#

I think you can activate and disable the component between turns

vapid magnet Jan 23, 2021, 3:30 PM

#

do they constantly replicate even when stationary?

peak sentinel Jan 23, 2021, 3:30 PM

#

Yes

#

But it has kind of optimizations still

#

If the difference between client and server location is too small sometimes it skips the Tick function

#

But replication of variables happens constantly

#

It just stops sending RPCs

#

CMC is awesome and very well coded by Epic senior engineers, if I were you I would make a stress test first then decide if to use custom component or CMC

#

I believe if Epic wouldnt provide CMC for free it could cost more than 10k$ to make it from scratch 😄

vapid magnet Jan 23, 2021, 3:33 PM

#

It definitely has some fancy stuff

meager spade Jan 23, 2021, 3:51 PM

#

i run 200 zombies on CMC 😄

#

plenty of CMC optimizations

#

animation optimizations, etc

lilac raven Jan 23, 2021, 3:58 PM

#

Hi all, my client is not spawning the player, but my server is, gamemode is set fine, and this is after server travel

#

any idea why this is? thx

vapid magnet Jan 23, 2021, 4:09 PM

#

gamemode only exists on the server iirc

#

also, how/where are you spawning the player?

lilac raven Jan 23, 2021, 4:10 PM

#

just through the map gamemodes default pawn at player start, its never failed through this whole project, suddenly it stops working

vapid magnet Jan 23, 2021, 4:12 PM

#

well, try to remember what you changed so it stopped working

lilac raven Jan 23, 2021, 4:12 PM

#

im just going to pull from VC and hope it works again

peak sentinel Jan 23, 2021, 4:16 PM

#

meager spade animation optimizations, etc

Can you open "animation optimizations"? I need to research those keywords 😄

meager spade Jan 23, 2021, 4:16 PM

#

Update Rate optimization and using Shared Animations

peak sentinel Jan 23, 2021, 4:17 PM

#

Have you done any customization on the update rate optimizations?

meager spade Jan 23, 2021, 4:17 PM

#

https://docs.unrealengine.com/en-US/AnimatingObjects/SkeletalMeshAnimation/AnimationSharing/index.html and https://docs.unrealengine.com/en-US/AnimatingObjects/SkeletalMeshAnimation/Optimization/index.html

Animation Sharing Plugin

Animation Optimization

Describes methods to achieve more performant Animation Blueprints through optimization techniques.

#

are good places to start for that stuff

peak sentinel Jan 23, 2021, 4:17 PM

#

👀 👍 Thanks

quick flint Jan 23, 2021, 6:17 PM

#

Is there a way to set up line of sight replication

#

So things don’t replicate to the client unless they have line of sight

cinder quartz Jan 23, 2021, 6:37 PM

#

https://docs.unrealengine.com/en-US/API/Runtime/Engine/GameFramework/AActor/IsNetRelevantFor/index.html

AActor::IsNetRelevantFor

Checks to see if this actor is relevant for a specific network connection

#

you can do any logic you want if you override it

quick flint Jan 23, 2021, 6:51 PM

#

@cinder quartz that only gets called once tho

rose egret Jan 23, 2021, 7:05 PM

#

@quick flint depends on your need. IsNetRelevantFor is not per replication tick. maybe IsReplicationPaused is what u r looking for

cinder quartz Jan 23, 2021, 7:05 PM

#

bool AThirdPerson426Character::IsNetRelevantFor(const AActor* RealViewer, const AActor* ViewTarget,
    const FVector& SrcLocation) const
{
    UE_LOG(LogTemp, Warning, TEXT("%f"), GetWorld()->TimeSeconds);
    return Super::IsNetRelevantFor(RealViewer, ViewTarget, SrcLocation);
}

put this on your player and you will see it gets called everytime a packet moves

#

or close to it

#

maybe not good enough for hiding actors depending on line of sight, its too slow propably, they pop in and out

quick flint Jan 23, 2021, 7:06 PM

#

rose egret <@!745303696413425695> depends on your need. IsNetRelevantFor is not per replica...

So what I’m trying to do is make in so that players behind walls are not network relevant

rose egret Jan 23, 2021, 7:07 PM

#

I did it with IsReplicationPaused and GetNetPriority

#

shooter game was using IsReplicationPaused I guess

#

though finding occluded characters is not much easy either

#

thats what I already have

bool ADezCharacterAlpha::IsReplicationPausedForConnection(const FNetViewer& ConnectionOwnerNetViewer)
{
    ADezGamePC* pViewerPC = Cast<ADezGamePC>(ConnectionOwnerNetViewer.InViewer);
    if (!pViewerPC)
        return false;

    ADezGamePS* pViewerPS = pViewerPC->GetPlayerState<ADezGamePS>();
    ADezGamePS* pThisPS = GetPlayerState<ADezGamePS>();
    if(!pViewerPS || !pThisPS)
        return false;

    //we never pause our teammates. we need their location, ..  even if they are too far or behind the wall
    if(pViewerPS->TeamIndex == pThisPS->TeamIndex)
        return false;

    //direction of net viewer to this pawn
    FVector viewDir = this->RootComponent->GetComponentLocation() - ConnectionOwnerNetViewer.ViewLocation;
    viewDir *= 0.01f; //convert to meter
    float viewDist = viewDir.Size();

    if(viewDist < Info->RepPauseConfig.NeverPauseRaduis)
        return false;

    if (pViewerPC->NetOccludedPlayers.HasBit(pThisPS->PlayerIndex)) //is behind wall ?
    {
        return true;
    }

    return false;
}

quick flint Jan 23, 2021, 7:15 PM

#

rose egret thats what I already have ``` bool ADezCharacterAlpha::IsReplicationPausedForCon...

Do you have to enable that

rose egret Jan 23, 2021, 7:19 PM

#

there is no enable/disable function if u return true in this function replication packet would be sent as empty with bIsPuased to true. RPCs still work.

shadow arch Jan 23, 2021, 7:22 PM

#

Any reasons why when i spawn a character actor my clientside movement gets desynced with serverside?

quick flint Jan 23, 2021, 7:28 PM

#

@rose egret when is this called? Is it called on tick?

rose egret Jan 23, 2021, 7:30 PM

#

@rose egret I guess before the replication. based on tick rate of server NetUpdateFrequency and whether any property is dirty or not

#

u can refrence that function and see who call it. (if u have source version)

quick flint Jan 23, 2021, 8:53 PM

#

I found out that replicated properties are expensive as heck

#

They are polled every frame, then compared across the other clients, and then it sends changes to everyone

#

for every single replicated property

#

.-.

meager spade Jan 23, 2021, 8:57 PM

#

they are not polled every frame

quick flint Jan 23, 2021, 8:58 PM

#

uh

meager spade Jan 23, 2021, 8:58 PM

#

they are polled when that actor is considered for replication.

#

they recenttly put PushModel in

quick flint Jan 23, 2021, 8:58 PM

#

oh

#

i was reading riot's article for their work on valorant

#

lol

#

Unfortunately, it’s also pretty slow. It requires scanning through every variable marked as replicated every frame, then comparing it to each of the 10 clients’ last known states, and then packaging any deltas to send to the client. This is effectively random access across memory and is really cache-intensive, slow work. Regardless of state changes, the variables are still checked. I consider “polling” systems like this a performance anti-pattern.

#

and read this

meager spade Jan 23, 2021, 8:59 PM

#

its not every frame, its every net update

#

when that actor is consdiered for replication

quick flint Jan 23, 2021, 8:59 PM

#

they changed it?

#

The fix is to utilize another UE4 networking tool: Remote Procedure Calls (RPCs). RPCs allow the server to call functions over the network that execute on one or more of the clients. Using RPCs on state changing gameplay events limit the performance cost to the frame on which the state change occurs. This “push” model is far more performant. The downside is that designers and engineers have to think more carefully about placement of RPCs and handling cases like reconnect. However, we found in many cases changing from a replicated variable to an RPC offered a 100x to 10000x performance improvement!

#

this is what they said in this riot article

meager spade Jan 23, 2021, 8:59 PM

#

its always been like that

quick flint Jan 23, 2021, 8:59 PM

#

oh so its still not optimal

meager spade Jan 23, 2021, 8:59 PM

#

its ok

cinder quartz Jan 23, 2021, 8:59 PM

#

maybe they forgot to change NetUpdateFreq from default 100 when writing that

meager spade Jan 23, 2021, 9:00 PM

#

people forget to also use Dormancy on actors

cinder quartz Jan 23, 2021, 9:00 PM

#

doesn't Unreal now also have Push thing? or something like that for replication? can't remember the name

meager spade Jan 23, 2021, 9:00 PM

#

but PushModel could save a bit of performance, as it does not have to check the property, rather quickly read a bit flag to see if that property is dirty

quick flint Jan 23, 2021, 9:00 PM

#

Is it something you have to enable manually?

cinder quartz Jan 23, 2021, 9:00 PM

#

where you tell that this variable should be repped now

meager spade Jan 23, 2021, 9:00 PM

#

yes

quick flint Jan 23, 2021, 9:01 PM

#

How do I enable it? And how do I use Dormancy?

#

Any documentation I could read?

meager spade Jan 23, 2021, 9:01 PM

#

Dormancy, just google it

#

push model, to turn it on Net.IsPushModelEnabled=true in your DefaultEngine.ini under the [ConsoleVariables] section

quick flint Jan 23, 2021, 9:02 PM

#

I'm worried about whether or not it should be enabled

#

How do I know if I should enable it? Are there any downsides?

cinder quartz Jan 23, 2021, 9:02 PM

#

do you have performance problems now?

quick flint Jan 23, 2021, 9:02 PM

#

Nope

#

But if it's free performance gains just because it's more optimal code, why wouldn't you use it?

meager spade Jan 23, 2021, 9:03 PM

#

cause your micro optimizing

#

before getting something working

cinder quartz Jan 23, 2021, 9:03 PM

#

agree, but only if it free and doesn't slow you down until you actually have a game

meager spade Jan 23, 2021, 9:03 PM

#

we put stuff in and then optimized it down the line

quick flint Jan 23, 2021, 9:04 PM

#

I don't plan on going down the rabbit hole with this, but if it's as simple as just a toggle, why not turn it on?

meager spade Jan 23, 2021, 9:04 PM

#

there is some changes you need to do

#

like changing a property you need Setter functions

#

so you can mark the property dirty

dark edge Jan 23, 2021, 9:04 PM

#

"Micro-optimizing before you even have it working" should be this server's tagline lol

quick flint Jan 23, 2021, 9:05 PM

#

ah

#

alright then

#

if it was just a toggle, i would have just turned it on lol

cinder quartz Jan 23, 2021, 9:06 PM

#

you can use it, but you just need to write a bit code than without it. if you are fine with that, you can toggle it, it's just setter for each property

#

https://docs.unrealengine.com/en-US/API/Runtime/NetCore/Net/Core/PushModel/index.html love the documentation on PushModel

PushModel

shadow arch Jan 23, 2021, 9:08 PM

#

Any suggestions on how to fix "movement not allowed" when you respawn a pawn?

#

to be specific this is from the SimpleMove node

#

📎 unknown.png

quick flint Jan 23, 2021, 9:13 PM

#

@cinder quartz is this the same 'push model' that riot was referring to tho

cinder quartz Jan 23, 2021, 9:14 PM

#

propably not, I think they made their own thing

#

at least it sounds like it, how they talk about RPC's, but who knows

meager spade Jan 23, 2021, 9:18 PM

#

using RPCs to push replicated props

#

as in the props are not replicated, but RPC's update those props by the looks of it

#

PushModel that UE4 has seems a lot nicer to manage

quick flint Jan 23, 2021, 9:23 PM

#

makes sense

#

i think i might look into it in the future

meager spade Jan 23, 2021, 9:25 PM

#

not worth it

#

the RPC thing that valorant did

#

they were optimizing for 60FPS dedicated servers

#

60hz*

quick flint Jan 23, 2021, 9:29 PM

#

yea

#

Honestly I'm trying to figure out like... How do you determine what to set your tick rate at?

#

Like I'm not sure what type of decision should be made for that

#

Does it depend on the type of game?

cinder quartz Jan 23, 2021, 9:30 PM

#

low as possible to save bandwidth and performance, then tune it up a bit if feels bad to play

#

also depends on game, game like Valorant or CS wants to minimize every delay

#

but on some co-op shooter it doesn't matter as much

quick flint Jan 23, 2021, 9:32 PM

#

I think ours is set to 30

#

Actually lol, it's even lower

#

It's set to 10 right now 😄

#

And we haven't had any issues

meager spade Jan 23, 2021, 9:33 PM

#

it all depends on how often they need to update there state

quick flint Jan 23, 2021, 9:35 PM

#

Yea

meager spade Jan 23, 2021, 9:35 PM

#

things that are constantly moving, will need to be updated more

#

things that affect gameplay alot, etc

peak sentinel Jan 23, 2021, 9:36 PM

#

My crowd NPCs are set to 5 and zombies are between 15-40 - dunno if I am using correct values but everything was looking smooth so far

#

But player controlled things never lower than 80

quick flint Jan 23, 2021, 9:38 PM

#

Anyone have any experience with dockerizing a dedi server? I was speaking with someone at riot games the other day and he recommended me to do that closer to when I'm ready to go to production. But I wanted to get some articles, or resources available now.

#

He told me they have like 100 game servers running on a single docker container

#

I think it was 100, maybe it was a thousand. I forgot the exact number

floral bison Jan 23, 2021, 10:50 PM

#

I wasn't sure if i should post this in here, animations or blueprints since its all 3 but I am trying to replicate root motion and I am having a weird issue with jittering. I made a video here to show what I mean. If anyone could help I am super new to multiplayer and root motion https://www.youtube.com/watch?v=EFA6dSNJBW0

YouTube

CrazyFace Games

Weird root motion issue with multiplayer

▶ Play video

lament sinew Jan 24, 2021, 1:30 AM

#

@tulip ferry I don't think so because at that point the player controller is not created yet on PreLogin
But it should be called if GameMode::Login failed i think
Also in the docs GameMode::Logout Called when a Controller with a PlayerState leaves the game or is destroyed

quick flint Jan 24, 2021, 2:45 AM

#

Replication happens super early in the game, is there a way to delay it until widgets are initialized, and other stuff is initialized

#

I have an OnRep variable which essentially sets some UI elements on launch, from the server. However, the UMG widget hasn't been initialized at this point.

meager spade Jan 24, 2021, 3:36 AM

#

Welcome to replication race issues

whole urchin Jan 24, 2021, 3:47 AM

#

@floral bison is CurrentMovement in CharacterBP replicated ?

#

and why are you using axes X and Z ? shouldn't you be using X and Y

#

Z is up

#

X forward, Y right

quick flint Jan 24, 2021, 4:54 AM

#

meager spade Welcome to replication race issues

How do you handle it in your project(s)?

meager spade Jan 24, 2021, 4:55 AM

#

By using engine callbacks and stuff

#

There is no magic one shield fits all here

#

Shoe

#

Replication races are z thing you will need getting a lot

quick flint Jan 24, 2021, 4:56 AM

#

Engine callsbacks

#

I'll look into it

meager spade Jan 24, 2021, 4:56 AM

#

Like onrep stuff

#

Delays is bad

quick flint Jan 24, 2021, 4:57 AM

#

Do you happen to know by the way, is there a way to visualize network relevancy ranges, as well as the animations being played on the server, vs the client? Riot games had something like this for valorant in one of their blog posts for animation stuff they showed how the character was in idle on the server side, but on the client it was in a regular animation and this was only during the 'buying phase' of the game.

meager spade Jan 24, 2021, 4:58 AM

#

They made that themselves

quick flint Jan 24, 2021, 4:58 AM

#

I see

#

That's what I thought

#

But I wasn't 100% sure

#

There seems to be a lot of race conditions in unreal honestly.

#

For many different things, and there's no way to control the execution order of actors, or ANYTHING for that manner.

#

Unless I am not aware of some hidden feature.

meager spade Jan 24, 2021, 4:59 AM

#

There is a few guarantees

#

But not many

#

Ganestate will exist on clients first and playercontroller

#

That's it lol

quick flint Jan 24, 2021, 5:00 AM

#

Yeah

meager spade Jan 24, 2021, 5:01 AM

#

We spent a little while getting our hud etc to behave properly under different networking conditions

#

You will likely do the same

#

We also split our HUD into specific widgets

quick flint Jan 24, 2021, 5:02 AM

#

Yeah that's something I'm finding to be very irritating

meager spade Jan 24, 2021, 5:03 AM

#

And it's not just us. Its other stuff

#

Thing is there is always latency and pkt drops and you can never know how much.

quick flint Jan 24, 2021, 5:07 AM

#

Yea

sand iris Jan 24, 2021, 5:11 AM

#

I have an HP bar widget that floats above the head of each client's character. How can I get the location of the owning client from each character's HP bar widget?
I tried this but didnt seem to work:

📎 unknown.png

#

Or do I have to loop though all player indexes and check which has authority?

📎 unknown.png

#

or HasAuthority was to check if the character is running on the server only?

peak star Jan 24, 2021, 5:33 AM

#

On of my blueprint delegates events are not being handled any more :( no explanation or error

#

I set it up exactly the same as before and confirm it is bound

#

I quit editor and rebuilt project. Now it magically works. Wish I jad tried that before burning an hour trying to fix ut

#

Actually no it is still not working on clients. Only servers. Which is weird because the onrep is.what calls the delegate

#

So execution is on the client at that point.

#

Okay i think the problem was that the bitmask was being set to same.value it already had so it didnt trigger onrep for clients

errant lance Jan 24, 2021, 7:51 AM

#

@sand iris use https://docs.unrealengine.com/en-US/API/Runtime/Engine/GameFramework/AGameStateBase/PlayerArray/index.html to get all players, then use
https://docs.unrealengine.com/en-US/API/Runtime/Engine/GameFramework/APlayerState/GetPawn/1/index.html
To get pawns and use getlocation.

PlayerArray

Array of all PlayerStates, maintained on both server and clients (PlayerStates are always relevant)

APlayerState::GetPawn

Return the pawn controlled by this Player State.

round mesa Jan 24, 2021, 9:07 AM

#

Hey guys, how do I log information for my dedicated server? I tried using print string (blueprints) and using the -log flag (which does show logs for my sever), but I can’t see my messages in a cooked server

rich ridge Jan 24, 2021, 10:08 AM

#

@round mesa UE_LOG prints on console

bitter oriole Jan 24, 2021, 11:02 AM

#

@round mesa Don't use a shipping build

gusty slate Jan 24, 2021, 11:33 AM

#

Hello everyone,
Just wanted to know if there was a way to properly simulate net saturation? I already know about a couple net commands but those are for each client (PktLag and PktLoss)

bitter oriole Jan 24, 2021, 11:35 AM

#

Use clumsy

gusty slate Jan 24, 2021, 11:41 AM

#

I'll have a look thanks

rose egret Jan 24, 2021, 11:52 AM

#

I feel someone is changing the relative location of ACharacter->Mesh to its CDO after I change it manually when played is down

#

🤔

#

I am trying to implement knockdown.

#

📎 unknown.png

#

I change the location but its still the same with CDO

rose egret Jan 24, 2021, 12:35 PM

#

nvm. found BaseTranslationOffset.

chrome bay Jan 24, 2021, 12:58 PM

#

You typically use another online service, such as Steam, which your "hosted" server registers itself with.

#

FindSessions then asks the platforms' 'Master Server' for available sessions.

#

If you don't want to use an online service like Steam etc, then you'll need your own master server(s)

#

Should go without saying but building that kind of backend is far from trivial

errant lance Jan 24, 2021, 2:50 PM

#

@atomic dragon you can use this https://github.com/RyroNZ/UE4MasterServer

As temp solution until you make your own or use steam or other backend

GitHub

RyroNZ/UE4MasterServer

This is a plugin for Unreal Engine 4 that adds server registration, deregistration etc with a master server. - RyroNZ/UE4MasterServer

gilded vapor Jan 24, 2021, 5:43 PM

#

Hi I am enabling bAllowPhysicsRotationDuringAnimRootMotion in the character movement component.

It seems that this causes some rubberbanding without a very good connection

#

Does anyone know if this is a good networking practice? (I am using an anim-notify state to enable/disable so this is "freely" replicated)

frank pecan Jan 24, 2021, 5:50 PM

#

I have a multiplayer game similiar to rocket league. So I have a ball that all the players interact with. Sometimes, but not all the time, I'm getting sync issues with the ball where it's jittering all over the place. I'm assuming there's a discrepancy with the ball on the server and the client. What's the best way to fix/troubleshoot this?

meager spade Jan 24, 2021, 6:19 PM

#

you using physics for your ball?

bitter oriole Jan 24, 2021, 6:19 PM

#

Best way to troubleshoot : dump position of every player and ball on tick to a log file, and use Python with matplotlib to draw yourself a nice graph

#

Best way to fix : well, multiplayer physics are hell on Earth, so it's going to depend on the results of the troubleshooting

meager spade Jan 24, 2021, 6:20 PM

#

i watched a video on Rocket League physics

gilded vapor Jan 24, 2021, 6:24 PM

#

@frank pecan RocketLeague has special handling for networking the ball

hollow oasis Jan 24, 2021, 6:42 PM

#

is this replication good?

📎 unknown.png

#

idk if i am doing it well

frank pecan Jan 24, 2021, 6:56 PM

#

@meager spade yes I am using physics for the ball

#

@gilded vapor Is it not reproducable?

meager spade Jan 24, 2021, 6:57 PM

#

ofc its reproducable, but you will need to do a bit of physics work

frank pecan Jan 24, 2021, 6:58 PM

#

Yea I'm okay with that that's why I'm here, I'm just looking to see if there is a path to go down.

peak star Jan 24, 2021, 7:44 PM

#

Is there a way to prevent any additional players from joining a session once the game has started in earnest? Players dropping in mid game would ruin the match because of how this particular gameplay's rules work. Needs to prevent joining by opening direct IP address in execute command node too. Bonus if I can make the game not show up for Find Sessions once it has begun or make it appear unjoinable so people dont try to join and get kicked

#

I am currently using a child of gamemodebase blueprint

hollow eagle Jan 24, 2021, 7:45 PM

#

https://docs.unrealengine.com/en-US/API/Runtime/Engine/GameFramework/AGameModeBase/PreLogin/index.html

#

read remarks

split siren Jan 24, 2021, 7:51 PM

#

I can't get Replication Graph to work/register. Any ideas why?
I have enabled the plugin and in DefaultEngine.ini I have added [/Script/OnlineSubsystemUtils.IpNetDriver] ReplicationDriverClassName="/Script/Scalar.ScalarReplicationGraph"

#

UScalarReplicationGraph is just a copy of BasicReplicationGraph

empty axle Jan 24, 2021, 7:56 PM

#

@frank pecan https://youtu.be/ueEmiDM94IE

YouTube

GDC

It IS Rocket Science! The Physics of Rocket League Detailed

In this 2018 GDC talk, Psyonix's Jared Cone takes viewers through an inside look at the specific game design decisions and implementation details that made the networked physics of Rocket League so successful.

▶ Play video

floral bison Jan 24, 2021, 7:59 PM

#

whole urchin <@!110089160437559296> is CurrentMovement in CharacterBP replicated ?

Yeah its replicated and the naming of the vars was just a typo on my part. I changed them to InputForward and InputRight. All 3 vars are replicated and even if I remove the nodes that change the InputForward it is still all jittery 😦

kindred widget Jan 24, 2021, 8:03 PM

#

@hollow oasis That's not actually replication, those are RPCs. It's important to know the difference between the two of them. In this case, replication would be better here. Replicate your casting state from the server and let the client play the effects in an onrep function when their state gets changed by the server. The Animations and particles can all be driven off of that single replication, and the fireball spell should probably be replicated itself, depending on how fast it moves. Then you would only need to spawn it on the server. If it moves too fast for that, you can probably rely on a multicast RPC for that or another replication state variable..

round mesa Jan 24, 2021, 8:31 PM

#

Still can’t see my logs. I think it’s because my dedicated server is hanging on “LogInit: First time updating LLM stats...”

#

Currently, what I’m doing is checking in my main menu game mode if it’s a dedicated server, and if so, jump to the game map and open a session

hollow oasis Jan 24, 2021, 8:38 PM

#

📎 unknown.png

#

so something like that

#

📎 unknown.png

#

@kindred widget

mighty tiger Jan 24, 2021, 8:39 PM

#

Im running into small network jitters while having clients jump of moving objects.
https://i.imgur.com/WkZwtjd.mp4

Whenever the objects move down i get this jittery jump and when objects move up i feel the clients are flying a bit too high.
Tested today with higher tickrate and couldnt see any difference on clients, on server side this is non existant 😕

Just using out of the box TPS project for client-server testing before adding my own game to it.
Anyone got any ideas what i should be looking at, or any tools , tips I could use to try and find this issue :-)?

Imgur

hollow oasis Jan 24, 2021, 8:39 PM

#

i am new to multiplayer so

peak sentinel Jan 24, 2021, 9:09 PM

#

ServerFunction()
{
  UpdateOnRepVarible()
}

UpdateOnRepVariable()
{
  Num = 1; // replicatedUsing = OnRep_Num
}

OnRep_Num()
{
  SetNumber(Num);
}

Doesnt OnRep functions supposed to work in server too if I change them in server rpc?

#

For now, client-to-client its working but in server Num is not being updated, even if I change it on Server RPC

lost inlet Jan 24, 2021, 9:11 PM

#

In C++, OnReps don't get called on the server unless you explicitly call the OnRep

#

this is different to the blueprint behaviour which does

peak sentinel Jan 24, 2021, 9:12 PM

#

I see, thanks for the info

peak sentinel Jan 24, 2021, 9:43 PM

#

Calling the OnRep function directly inside of the server RPC solved most of the issues ✅ thanks sswires

whole urchin Jan 24, 2021, 9:44 PM

#

@floral bison i see, can't see what's wrong if i don't see the whole setup

#

and i will tell you what everyone told me, but i'm no expert

#

don't use root motion with multiplayer

floral bison Jan 24, 2021, 9:52 PM

#

im discovering that thats probably good advice lol

#

root motion is just so smooth

whole urchin Jan 24, 2021, 10:03 PM

#

you are me 4 months ago

#

hehe

#

good luck

meager spade Jan 24, 2021, 10:19 PM

#

How to call RPC's inside a UObject https://www.thegames.dev/?p=45

The Games Dev

Kaos Spectrum

Calling RPC functions inside a UObject - The Games Dev

I have often seem times where people want to call RPC functions inside a UObject that has an outer ofContinue readingCalling RPC functions inside a UObject

fossil spoke Jan 24, 2021, 10:21 PM

#

meager spade How to call RPC's inside a UObject https://www.thegames.dev/?p=45

meager spade Jan 24, 2021, 10:21 PM

#

just provided a bit more information

tropic snow Jan 24, 2021, 11:56 PM

#

How do you disconnect and reconnect to a server when debugging from editor?
Want to see the behavior of clients leaving and reconnecting mid game.

low vessel Jan 25, 2021, 12:04 AM

#

looking at the WIP network prediction plugin (https://github.com/EpicGames/UnrealEngine/blob/release/Engine/Plugins/Runtime/NetworkPrediction/readme.txt), looks like it's using Chaos for rewind and resim (FRewindData::RewindToFrame, etc), since PhysX doesn't support this as easily i assume. i am looking into this because i want to be able to rewind to server state and apply unacked client inputs to predict autonomous proxy state while also using the built-in physics instead of implementing my own.

given that this is a WIP still and chaos is pretty new, does it make sense to try implementing something similar but simplified/specialized to my sim (8 player racing game with box collisions and static world, where accurate collision responses are as important as landing shots in FPS games + lots of jerky movements)? wanted to ask in case anyone else has attempted this or knows more about it

unborn nimbus Jan 25, 2021, 12:27 AM

#

meager spade How to call RPC's inside a UObject https://www.thegames.dev/?p=45

Does this only work if the owning actor is replicated?

meager spade Jan 25, 2021, 12:32 AM

#

it needs to have owner set on the actor that has a owning connection

#

ie owner being PlayerController or PlayerPawn that is possessed

#

and for multicast, etc then that actor has to exist on every client

#

for server/client rpc then only the server/local client needs to have that actor

unborn nimbus Jan 25, 2021, 12:35 AM

#

Makes sense

swift kelp Jan 25, 2021, 1:13 AM

#

how could I make this secure?
I am making a poker app and say one player has a network issue and din't get his hole cards.
Is it possible for the player to request from the game-mode their hole cards again without it being insecure.
I sounds like someone who was using CheatEngine could just change their player index and get someone elses cards then switch back by wiping their mem address (of where their cards are) and then re-asking the server for their real cards. Then they would know what both they have and the cards of their villain.
Unless there is a way to prevent this attack.

hollow eagle Jan 25, 2021, 1:16 AM

#

The server knows which player is sending an RPC... you can't just change values in the client's memory to change that.

#

also, the situation you're giving is a bit contrived - stuff like what cards you have should be reliably replicated.

split siren Jan 25, 2021, 1:23 AM

#

I have a question about replication graph.. My replicated actors are registered in the SpatialGrid2D graph node, I see them in the ReplGraph.PrintAll, but they are not replicating to client... No movement, neither RPC multicast calls. Any idea what could this be?

#

📎 unknown.png

#

They replicate if I mark them "Always relevant" and they go into always relevant node

barren patrol Jan 25, 2021, 2:47 AM

#

@swift kelp use a replicated array of cards on the playerstate and use RepNotify to trigger code based on when they are updated

#

a replicated array property should make those values eventually consistent even through disconnect / reconnect cycles

#

https://docs.unrealengine.com/en-US/InteractiveExperiences/Networking/Actors/Properties/index.html

Property Replication

Detailed information about how Actor properties are replicated.

#

Actor property replication is reliable.

#

Set the replication condition to Owner Only so that others cannot see their cards in any way.

#

You will need to use some other variable or RPC to broadcast the card values when they turn over their cards though.

swift kelp Jan 25, 2021, 2:55 AM

#

@barren patrol thought if the hole cards are replicated on the player state then other players could see each other's hole cards. Are you saying that isn't true?

hollow eagle Jan 25, 2021, 3:09 AM

#

It's true. Just replicate it on something that doesn't replicate to other players - like the player controller

#

or a custom actor

meager spade Jan 25, 2021, 3:17 AM

#

The game mode could hold the cards and client rpc to them to the player controller on connect if they exist in his old player state. Player state does not have to replicate them just hold them.would be another way

#

Gamestate*

odd sundial Jan 25, 2021, 3:35 AM

#

Hey all!

I'm trying to launch a gadget forward from the player and at the pitch of the camera rotation (so if camera is looking up, for example, the gadget launches forward and up from the camera)

This works just fine on the server, but the rotation and direction of the launch isn't replicating to the clients and I can't figure out why... anyone have any advice?


if (GadgetMeshComp && DeployedGadget)
{
    //launch the gadget
    FRotator CamRot;
    FVector StartLoc = ThirdPersonCameraComp->GetComponentLocation();
                                    
    GetThisPlayerController()->GetPlayerViewPoint(StartLoc, CamRot);                        
    FVector ShootDir = CamRot.Vector();
    GadgetMeshComp->AddImpulse(ShootDir * GadgetLaunchForce, FName(""), false);
}```

#

This code is called from a server RPC

#

The gadget actor itself is set to replicate/replicate movement also...

barren patrol Jan 25, 2021, 3:54 AM

#

@swift kelp you need to set the replication settings to Owner Only.

swift kelp Jan 25, 2021, 3:54 AM

#

i didn't know that was a thing

barren patrol Jan 25, 2021, 3:55 AM

#

@hollow eagle does that not work on PlayerState?

hollow eagle Jan 25, 2021, 3:55 AM

#

does what not work on playerstate

barren patrol Jan 25, 2021, 3:55 AM

#

hollow eagle It's true. Just replicate it on something that doesn't replicate to other player...

this

hollow eagle Jan 25, 2021, 3:55 AM

#

playerstate replicates to all clients

#

and you probably don't want to change that

barren patrol Jan 25, 2021, 3:55 AM

#

couldn't you just use OwnerOnly condition for the replication of that variable?

hollow eagle Jan 25, 2021, 3:56 AM

#

that's true

#

you could do that

sonic jasper Jan 25, 2021, 7:50 AM

#

hello, i am getting a jitter on character movement only when going side to side (strafe) and backwards, forward works fine.

Visible on client, listen server can see it, client looking at client cant? Anyone point me in any kind of direction to what might be the cause?

I have checked velocity on server/client its matching, anim blend space seems to be running smooth.

pallid mesa Jan 25, 2021, 8:30 AM

#

ue version?

sonic jasper Jan 25, 2021, 8:31 AM

#

4.26

pallid mesa Jan 25, 2021, 9:06 AM

#

chaos?

#

enabled or disabled?

#

if chaos is enabled and your character is walking on top of an scaled mesh, there are currently some jitter issues

#

if chaos is disabled and your listen server jitters... that's an old well know problem of ue4

low vessel Jan 25, 2021, 9:09 AM

#

is it because of trace issues? i had some jitters with custom physics while moving on top of a scaled mesh

#

although only when i had substepping enabled

pallid mesa Jan 25, 2021, 9:10 AM

#

subtepping in chaos doesn't work currently

low vessel Jan 25, 2021, 9:10 AM

#

ah

#

that clears up a lot 🙂

pallid mesa Jan 25, 2021, 9:10 AM

#

hahah yeah, they are working on it

#

to add to the conversation

#

https://gyazo.com/f366884342a19b38f13c3980a489834a

Gyazo

▶ Play video

#

and.. fortnite https://www.thegames.dev/snaps/CHh8gCTj6S.mp4

▶ Play video

#

note how at 30 fps the vehicle jitters

low vessel Jan 25, 2021, 9:13 AM

#

haha oh my

#

when i heard they integrated it into fortnite, i assumed substepping was working 😅

pallid mesa Jan 25, 2021, 9:15 AM

#

it's not really a very very hard priority as fortnite runs well in every single computer

#

so very unlikely someone would go below 60 fps

low vessel Jan 25, 2021, 9:15 AM

#

ah i see, yeah that makes sense

chrome bay Jan 25, 2021, 9:17 AM

#

If you want rewind/replay in PhysX, you're gonna have a bad time

#

Chaos has a new API for it, but it's not finished

#

Probably won't be production ready for many months yet

#

Expect to see a first iteration in UE5

low vessel Jan 25, 2021, 9:18 AM

#

oo i see, yea i've been looking into rewind/replay with Chaos

chrome bay Jan 25, 2021, 9:18 AM

#

Best approach for physics right now, if you don't want input lag, is make it client auth

low vessel Jan 25, 2021, 9:18 AM

#

why's it not production ready yet?

bitter oriole Jan 25, 2021, 9:18 AM

#

It's broken

#

Hilariously

chrome bay Jan 25, 2021, 9:19 AM

#

If you have only a handful of physics objects, perhaps you can store and replay the entire PhysX scene, which is essentially what you need to do (and how Rocket League does it)

#

But that has a very low ceiling for scalability

low vessel Jan 25, 2021, 9:20 AM

#

i only have at most 8 dynamic physics objects, colliding against a static track

chrome bay Jan 25, 2021, 9:20 AM

#

Might be okay then

low vessel Jan 25, 2021, 9:20 AM

#

mm i see

chrome bay Jan 25, 2021, 9:20 AM

#

You can't simulate individual objects in a PhysX scene, you have to step the entire scene

#

Chaos has a more convenient system for only resimulating objects which moved

#

But it's still not cheap

#

And not foolproof either

low vessel Jan 25, 2021, 9:21 AM

#

is there anything written about how RL did it? watched the GDC video but didn't find any implementation details. or maybe i just need to learn PhysX and read the UE PhysX integration?

chrome bay Jan 25, 2021, 9:21 AM

#

GDC video is all really, AFAIK

#

You don't really have to work with the physics engine directly, aside from putting objects back where they were once-upon-a-time, then resimulating the worlds physics scene

#

The hard part is keeping histories, and replaying all that efficiently - but that's all something you'd have to build

pallid mesa Jan 25, 2021, 9:23 AM

#

I remember your tales with that back in the day

chrome bay Jan 25, 2021, 9:23 AM

#

It's literally not worth it, is my consensus

#

Unless you're working on a world-renowned massive title with esports heritage, save yourself the hassle

#

Do it the easy way

#

Client-auth, with a bit of basic anti-cheat

#

It feels dirty but the issue of getting physics engines and networked games to play well together has existed since the 90's, and there still isn't a solution really.

low vessel Jan 25, 2021, 9:27 AM

#

:x yea that might be the way to go at this point, at least for the first iteration

chrome bay Jan 25, 2021, 9:27 AM

#

100% - get something playable, work out the details later 😄

#

I lost a lot of time on this so this is just my scorned advice, but when you've sold enough copies of something for it to matter, then you can invest time into a stricter model 😄

low vessel Jan 25, 2021, 9:28 AM

#

haha yeah that makes sense

#

although for me i'm a bit blocked on my modelers currently, so i'm spending a lot of time looking into the networked physics (also cuz it's been fun so far)

hollow oasis Jan 25, 2021, 9:35 AM

#

i Am new to multiplayer so sorry 😛

#

i am trying to make that my projectile deals damage

#

📎 unknown.png

#

i have this on player bp

#

and this on fireball bp

📎 unknown.png

sinful tree Jan 25, 2021, 9:41 AM

#

Does your enemy NPC BP implement the same BPI "Event Apply Damage"? If so, all you'd have to do is do is the same BPI call to the other actor on your OnHit on your Fireball BP

hollow oasis Jan 25, 2021, 10:22 AM

#

sinful tree Does your enemy NPC BP implement the same BPI "Event Apply Damage"? If so, all...

sorry 😦 i dont understand what u mean

#

@sinful tree

sonic jasper Jan 25, 2021, 10:46 AM

#

my issue back up was to uncheck below settings, thanks

📎 unknown.png

split siren Jan 25, 2021, 11:43 AM

#

Is there a way to destroy actor on client if it stops being replicated?
For example, I have an Actor called TeamPlans, which is relevant only for the members of given team. Once player changes team, it should destroy all previous TeamPlans outside of his new team.

#

They stop replicating to that player if he changes team, but they still remain in the client world.

marble gazelle Jan 25, 2021, 12:04 PM

#

hm Will have a similar issue with stealth, but didn't tackle that yet, maybe send an RPC in first place that requests its destruction?

split siren Jan 25, 2021, 12:06 PM

#

@marble gazelle That might not work, because if there is any late replication packet about that actor arriving after the RPC, it would respawn it

#

I think

marble gazelle Jan 25, 2021, 12:09 PM

#

not sure for the order of RPCs and property replication

chrome bay Jan 25, 2021, 12:12 PM

#

@split siren You are using replication graph I assume?

split siren Jan 25, 2021, 12:12 PM

#

True

chrome bay Jan 25, 2021, 12:12 PM

#

Replication Graph essentially doesn't send destroy packets for actors that are far away

#

But that being said, if an actor is no longer relevant to a client they usually just destroy it instantly

#

DestructInfoMaxDistanceSquared is the value you can tweak for destruction infos

#

But I'm 90% sure that that doesn't apply to relevancy... but maybe it does

split siren Jan 25, 2021, 12:15 PM

#

Oh, i see.. I think I did my testing wrong then, because when stopped replicating an actor to specific connection, it remained in the client world "frozen" aka (but did not receive any updates).

chrome bay Jan 25, 2021, 12:15 PM

#

It's not dormant or something is it?

split siren Jan 25, 2021, 12:16 PM

#

It was Spatialize_Dynamic

chrome bay Jan 25, 2021, 12:16 PM

#

You can also call SetActorDestructionInfoToIgnoreDistanceCulling()

#

Right, as it's spatialized perhaps that's the issue

#

TeamPlans "sounds" like an info actor of some kind that shouldn't have distance-based relevancy

#

just guessing there

#

BTW I'd look at the shootergame replication graph

#

It's a more fleshed out example that maps actor classes to replication policies

split siren Jan 25, 2021, 12:24 PM

#

Thanks for the insights! I have that opened, basic rep graph and someones LocusReplicationGraph on Github and trying to understand the flow of the code.

The TeamPlans are actually a TeamBuildingPlans, basically a preview of a house any member of team can see and contribute to. So I am trying to make a baby from Spatialized node and TeamRelevancy node.

chrome bay Jan 25, 2021, 12:25 PM

#

Yeah you'll probably need to make your own connection node for that

split siren Jan 25, 2021, 12:25 PM

#

And if you are saying the actor should despawn on client if no longer relevant for that client, I have issues somewhere in my code. Which is a big help to know.

chrome bay Jan 25, 2021, 12:25 PM

#

Yeah when an actor is not relevant anymore, it's actor channel is closed and the actor is destroyed client-side

#

At least that's what is supposed to happen. AFAIK, actors being destroyed via relevancy isn't affected by the destruction max distance in rep graph

#

We would definitely have run into problems by now if that was the case anyway

winged badger Jan 25, 2021, 1:13 PM

#

actors loaded from package don't get destroyed

#

only ones spawned at runtime

ivory lintel Jan 25, 2021, 1:55 PM

#

how i need to do to some variable replicate of player A to player B when player B connect on server and load player A?

#

trying to use repnotify but only run the function on server and own A...player B dont see

bitter oriole Jan 25, 2021, 2:34 PM

#

Replicated variables are copied from the server to clients

#

RepNotify in particular calls a method when the client-side value has been updated

ivory lintel Jan 25, 2021, 2:35 PM

#

i set the variable on server and try to see on clients and dont work

bitter oriole Jan 25, 2021, 2:35 PM

#

Which class ?

ivory lintel Jan 25, 2021, 2:36 PM

#

trying to set on server inside GA class

#

📎 unknown.png

bitter oriole Jan 25, 2021, 2:36 PM

#

What's GA ?

ivory lintel Jan 25, 2021, 2:37 PM

#

gameplay ability

meager spade Jan 25, 2021, 2:37 PM

#

GameplayAbilities do not replicate

#

by default

bitter oriole Jan 25, 2021, 2:37 PM

#

^

ivory lintel Jan 25, 2021, 2:38 PM

#

after after server set variable in GA...pawn cannot see

📎 unknown.png

meager spade Jan 25, 2021, 2:38 PM

#

also, you hardly ever, replicate a gameplay abilitiy

ivory lintel Jan 25, 2021, 2:39 PM

#

this GA are setted to replicate

#

📎 unknown.png

meager spade Jan 25, 2021, 2:40 PM

#

yes but why

ivory lintel Jan 25, 2021, 2:41 PM

#

this is a class the collect item on multiplayer map

#

i need some RPC inside the class at this moment

#

the class are working with RPC but, only if all players are connected on the server

meager spade Jan 25, 2021, 2:43 PM

#

this does not sound like a job for a Gameplay Ability

ivory lintel Jan 25, 2021, 2:44 PM

#

if player B connect on server after player A get the item...this player dont see the player A using the item

ivory lintel Jan 25, 2021, 2:45 PM

#

meager spade this does not sound like a job for a Gameplay Ability

my GA need to setup some meshes on character to all players when use the ability

#

where is the best play to replicate this event of set this mehes?

#

i'm still learning about GAS

meager spade Jan 25, 2021, 2:47 PM

#

abilities are to do things at the time, stateful things need to be managed in other ways

ivory lintel Jan 25, 2021, 2:47 PM

#

ok

#

i'ill check template about how to do this right

#

ty btw

chilly tinsel Jan 25, 2021, 3:35 PM

#

Quick question for anyone. If I wanted to use a datatable to add character unlockables and then filled an array based on the datatable and used a save system to keep track of what was unlocked / locked wheres the best place to store that array in a multiplayer game? I initially used the Game Mode but obviously not all clients own one that stops the data driven UMG from the Array working. I'm thinking the Player State?

prisma vortex Jan 25, 2021, 3:44 PM

#

Can anyone help me? I am using a very basic multiplayer system and want to run my menu before the actual multiplayer level as I like both online and offline but I keep getting the same error.

📎 Error.png

#

These are the only other levels I have so I have no idea as to why its throwing up an error

📎 Other_levels.png

lament sinew Jan 25, 2021, 4:07 PM

#

look at the error

#

you trying to travel to ThirdPersonExampleMap

#

do you have that anywhere in your Maps folder? cuz i don't see it

flint star Jan 25, 2021, 4:28 PM

#

hey anyone else have stopped receiving OnRep_Controller on pawns after 4.26?

#

any stealth changes?

#

before, client pawns got begin play while already possessed, this stop happening and the OnRep stopped being called on clients for me

gusty slate Jan 25, 2021, 5:07 PM

#

Hello everyone, after a ServerTravel (Non-Seamless) what is the first class that gets initiated on clients?
I notice that the flow with the first connection and ClientTravel (After ServerTravel) is different and the client gets a long time before it starts getting intiated so I'm trying to add a load screen, but I can't find the first class that gets initiated

gusty slate Jan 25, 2021, 6:39 PM

#

Basically what I mean is, every time a Non-Seamless ServerTravel (on Packaged build with Steam) happens, there is a delay of a few seconds between the level loading and the first classes getting initiated. The first one I could detect was Controller's construction script (1)

📎 unknown.png

#

Without using seamless travel, I can't find why or how to deal with that delay there

inner sand Jan 25, 2021, 7:06 PM

#

really need some help hear using ue4 bp session system what is the proper way to shutdown session when one of the clients is acting as server when using destroy session the connected clients will there after no longer be able to join any other sessions as if they are still connected

gusty slate Jan 25, 2021, 7:25 PM

#

DestroySession has to be called by the clients as well

#

You need to do it in a few places to properly handle the closing down of the session

bitter oriole Jan 25, 2021, 7:36 PM

#

Why are you not using seamless, btw ?

#

Is Steam running and connected ?

#

No idea really, I never worked with dedicated servers, but maybe you can try that

thin stratus Jan 25, 2021, 8:00 PM

#

For dedicated servers you must add the steam dlls to the packaged server. Think into the binaries folder is fine

#

Unless you have done that already

#

@atomic dragon

inner sand Jan 25, 2021, 8:20 PM

#

does anyone know how to get a unique net id for clients

#

oh nvm found smth in player state

unkempt tiger Jan 25, 2021, 8:49 PM

#

Anyway to make my weapons' LocalRole into Autonomous Proxy if it's net-owned by a certain controller?

meager spade Jan 25, 2021, 8:49 PM

#

why would weapons be autonomous?

unkempt tiger Jan 25, 2021, 8:49 PM

#

Isn't the character autonomous?

meager spade Jan 25, 2021, 8:49 PM

#

yes but why would the weapon be?

unkempt tiger Jan 25, 2021, 8:49 PM

#

I see a weapon as an extension of a character

meager spade Jan 25, 2021, 8:49 PM

#

what benefit would you gaisn?

unkempt tiger Jan 25, 2021, 8:50 PM

#

Probably just an easy check of whether or not I should try to predict stuff

meager spade Jan 25, 2021, 8:50 PM

#

GetOwner()->GetLocalRole() ?

unkempt tiger Jan 25, 2021, 8:50 PM

#

But I guess I can do it through- yes I suppose, that

meager spade Jan 25, 2021, 8:51 PM

#

that is what mostly everyone does 😄

#

just make a wrapper function

unkempt tiger Jan 25, 2021, 8:51 PM

#

Way I implemented weapons is essentially another character in many aspects, yeah

meager spade Jan 25, 2021, 8:51 PM

#

o_0

unkempt tiger Jan 25, 2021, 8:51 PM

#

So I guess I figured it made sense, thanks

#

Don't worry, not all aspects :)

meager spade Jan 25, 2021, 8:51 PM

#

weapon is another character? 🤔

#

using GAS?

unkempt tiger Jan 25, 2021, 8:52 PM

#

Nope, my own stuff from scratch

meager spade Jan 25, 2021, 8:52 PM

#

:/

unkempt tiger Jan 25, 2021, 8:52 PM

#

The way I predict things with weapons is the same flow I predict things with my characters

meager spade Jan 25, 2021, 8:52 PM

#

weapons with GAS is really nice

#

prediction, etc

unkempt tiger Jan 25, 2021, 8:52 PM

#

What kind of benefits does it have? Is it very easy to implement?

meager spade Jan 25, 2021, 8:53 PM

#

would not say its easy to implement

#

but i can have like a fire weapon, or ice weapon, without actually creating a new weapon

#

simply just apply an effect that gives it the ice tag for example 😄

#

then the benefits of taking in bunch of player attributes, for weapon shots

#

and calculating final damage

unkempt tiger Jan 25, 2021, 8:54 PM

#

It felt quite overwhelming trying to approach GAS honestly, but in retrospect it'd still probably be easier than implement my own system from scratch

meager spade Jan 25, 2021, 8:54 PM

#

i like it, might not be for everyone though 🙂

unkempt tiger Jan 25, 2021, 8:55 PM

#

Although I'm really happy with mine, maybe for future projects 🙂

celest sleet Jan 25, 2021, 9:08 PM

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So, I could use some assistance, I have been working on this since November and have made little to no progress. All I want right now is so 2 people can host/connect to a LAN listen server. and both be able to wave at each other in VR. But in my various attempted tests either the host or the client does not seem to be possessing the pawn, they are unable to do anything beyond look around as soon as the client connects But according to EVERY SINGLE THING that I have read It should be working. I read online someone having a similar problem I tried what worked for them and IT MADE IT WORSE. And even then neither of them see any hand movement even though according to things I read online they SHOULD be replicating movement. I have No Idea what to do. I don't know where to even look. I have run out of ideas to try, and things to type into google to find more. I will gladly post any info about what I have in ways of code, settings, defaults, etc. but as I have no idea what is relevant anymore i am not going to just dump absolutely everything here.

tranquil yoke Jan 25, 2021, 9:18 PM

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Hey Guys, I have this super annoying problem to solve, I am building something for Quest and its multiplayer, I want my character to disappear for everyone as soon as i press quit on Quest. I am using Application Lifecycle Component, to get the events, if it is going in background thread, because in Android you never get this Shutdown.
-- So i pass RPC to server, that i have been going in background thread, Remove my Avatar for everyone on server.

Problem, that code never gets called, because Client dies before doing that, i check my code, Client hit the call for background thread but server never received that.

Can someone has a better approach to handle this kind of situation ?
Thanks

celest sleet Jan 25, 2021, 10:04 PM

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I am seriously considering scrapping the year+ of development and start anew in another engine like maybe unity. but if I cant even get the Flipping basics of multiplayer VR in Unreal, How could I expect to do otherwise anywhere else.

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I just cant keep going on like this. searching desparatly for any tidbit of info that may or may not apply, to get a glimmer of hope when I find something I have not found a dozen times already. Only to have it squashed when it has no effect or even Breaks things even more.

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When I started this project it was fun. and when messing with the art it still is, but this Freaking problem with Multiplayer is not fun anymore, hasn't been for weeks

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and as I am not being payed for this at all I am starting to question why I am still trying

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I do want to play this game concept, but it is looking more and more like I am unable to make even the Basics Work

unkempt tiger Jan 25, 2021, 10:41 PM

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@celest sleet Please consider powering through it until it's solved. I'm not sure I'm equipped with the knowledge needed to help you, but if you want some guidance from other experts here you should provide us with a minimal question/problem you need solved, along with your relevant code (ideally stripped of anything else not relevant to the problem)

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you didnt really make it clear what the problem is

celest sleet Jan 25, 2021, 11:02 PM

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the problems are 1) after a client connects to the listen server, one player or another will not receive input from motion controllers 2) movement from motion controllers are not being replicated

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so I have 2 vr buttons one is "host" one is "join"

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the first player presses "host" a session is created and it opens the level as a listen server

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things are working

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the second player presses "join" and they join the session

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but then the first player will break, hands no longer tracking and no button input

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and I am not sure what is and is not relevant code because according to everything I can find, it should be working

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but it is not

unkempt tiger Jan 25, 2021, 11:14 PM

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can you get the same setup to work on the third person template?

celest sleet Jan 25, 2021, 11:16 PM

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I tried to get it to work on the VR template and no it did not work

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this is the on activation code for the 2 buttons

📎 unknown.png

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like they are connecting, a pawn is being spawned for each player but for some reason one is not recieving input

sinful tree Jan 25, 2021, 11:33 PM

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Can you show what your pawns's input system looks like?

celest sleet Jan 25, 2021, 11:53 PM

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ok, can do

📎 unknown.png

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sinful tree Jan 25, 2021, 11:55 PM

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Ok, where is Left Controller and Right Controller being set?

celest sleet Jan 25, 2021, 11:57 PM

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that would be here, called by Event beginPlay

📎 unknown.png