multiplayer

[tepid lark]

The line at KTBMcharacter is BindASCInput()... which I don't think is the issue... above that is

AbilitySystemComponent->RefreshAbilityActorInfo();```

and in the logs ```Script Stack (1 frames):
Pawn.OnRep_PlayerState

[2023.06.26-21.59.51:616][572]LogWindows: Windows GetLastError: The operation completed successfully. (0)
[2023.06.26-22.00.51:649][572]LogWindows: Error: === Critical error: ===
[2023.06.26-22.00.51:649][572]LogWindows: Error:
[2023.06.26-22.00.51:649][572]LogWindows: Error: Assertion failed: InOwnerActor [File:D:/UnrealEngine-4.26/Engine/Plugins/Runtime/GameplayAbilities/Source/GameplayAbilities/Private/GameplayAbilityTypes.cpp]

[sinful tree]

And whatever a dialogue is, is what you should be retrieving through the interface to send back to the client to execute.

If it is static data then you likely want to use references to that data rather than replicating a string.

[oak pond]

why can I never find any results for the simplest things

[dark edge]

You aren't looking in the right spot

or you're doing something new / unknown

[oak pond]

often seems to be the case, but I just need to make a multiplayer event not affect the controlled player

literally just do it on the other players end but not your own game

[tepid lark]

can you ping the game mode with the controlled player you want to exclude from receiving the thing tell all the other players to do a thing

[oak pond]

how do you mean

[tepid lark]

https://tenor.com/view/charlie-always-sunny-gif-26054360

[oak pond]

I even tried checking if locally controlled

then it just does nothing (as in doesnt change anything, event still happens to both)

[sinful tree]

Why cant you just use the built in character movement component?

[icy jetty]

mb, I misread

[oak pond]

far too late for that now

I could list the problems with that for hours. well, maybe a few minutes

its nice to have a player controller that isnt constantly stuck to the floor

[icy jetty]

don't fight the engine

[oak pond]

my player controller is infinitely better for the specific type of game Im making

I debated this for a long time, tried using default cmc for as long as I could but it just was not a fun game until I made my own

huh whats that I can push a physics object without launching the player into space? https://gyazo.com/d133d647f0f4ac78b1340ccf6409ded7

[icy jetty]

i c. I wish you luck, the CMC has circa 1000 lines of intricate code iirc

[oak pond]

yeah thats the thing its built more for realistic games

or simple

idk what Im saying

but yeah mine works nice for this game, just makes multiplayer harder

[tepid lark]

not sure if anyone cares... but for the record getting rid of the spawners and just spawning one ai works so that's something.

[oak pond]

see this works but decreasing this 0.2 delay any more affects the players movement on his end too (even though I literally tell it not to?) and no delay makes him locked in place https://gyazo.com/c304e42a2553cd56183cd307f6aeb002

AH I DID IT https://gyazo.com/b3665b3648bd31892d8e53f1e0e71fe0

even though Im sure I just did something that I already did earlier and it didnt work buuuut ok idk these things are very specific

[sinful tree]

Now introduce 133ms of lag and see what happens

[dark edge]

yeah predicted movement and physics is a clusterfuck

it can work fine, until 2 clients disagree on what the box they are pushing is doing (since they are both in the future vs the other)

Non-predicted movement and multiplayer physics is just fine, everyone sees what the server sees

[oak pond]

yeah, Im still doing this "ghost" approach kinda thing, the other player has no collision or even physics it literally just sends the location across

obviously I wanna avoid physics for multiplayer wherever possible

[oak pond]

I was actually just about to see about testing that, Im wondering whatll happen

how do you simulate lag again?

[dark edge]

play in editor settings

[oak pond]

cant seem to find it

ah emulation nvm

YES THATS EXACTLY WHAT I HOPED FOR https://gyazo.com/000181f22cc06dd9c65b7260f06443c1

THATS WHY IM DOING THIS

[pallid gorge]

So every widget should be in player character?

[sinful tree]

If you do it right, you only need one widget and feed it all the data you need.

[pallid gorge]

Yeah but that one widget still need to be in the Player Character?

[sinful tree]

No it doesn't have to be. You can put it basically anywhere you want, but the RPC starting the interaction in the character and receiving the data in the character makes sense, you just route the received data where you need/want it.

[nocturne quail]

If I wan to crouch

void OnRep_bCrouch()
{
  StartCrouch();
}

void StartCrouch() //user input`C`
{
  bCrouch = true;
}

I am doing it correctly?

[vital adder]

Hi there, is there anyone that knows why the movement for the client is jittery? (Only when walking backwards & to the sides. Walking forward is perfectly fine), I've also replicated sprint which works perfectly forward, however, same jittery movement backwards etc.

Any ideas on this? I use Unreal Engine 5.0.3.

[latent heart]

Does other clients know you're walking forwards or backwards?

I think you'd get what you describe if whichever client is getting the jitter was thinking that the moving client was always walking forwards.

Rather than other directions

[vital adder]

I've added a flashlight so you can clearly see what's going on.

I've tried numerous stuff. Cannot seem to get it to work 😅

(Client is on the left)

[dark edge]

its your locomotion blend space

The actual movement is fine

its your animation stuff

[vital adder]

I disabled the animation, still got the issue.

[sinful tree]

No. bCrouch should be set on the server. The OnRep you would have it do whatever you need it to do if that boolean changes on clients.

[nocturne quail]

Setting it on server will not set it on only server?

[sinful tree]

If it's a replicated variable (which it would be if you're doing an OnRep and if it has no fancy replication conditions) then setting it on the server will set it for all clients.

[nocturne quail]

ah, I thought it don't need an RPC call because I am using CMC to set that variable

thank You for correcting me

[sinful tree]

Check #instructions for making a job posting.

[nocturne quail]

does Unreal supports p2p ?

[oak pond]

there was a discussion about that earlier actually lol

[latent heart]

If you want to use replication and such, absolutely not.

You can add on your own network layer if you want to.

[nocturne quail]

oh, all right, I will think about it )

[latent heart]

But this would not be supported by anything in unreal, except for the fact you probably have some socket managing classes.

[nocturne quail]

Thank You for quickly correcting me

[oak pond]

I still don’t understand it ngl. sounds like what multiplayer does anyway. I guess listen server relies on the server itself than each other’s machines?

[latent heart]

Unreal.

[oak pond]

so like rather than peer to peer, listen server would be like, peer to server to peer?

[latent heart]

There are no "peers" in unreal. Everyone is either a server or a client.

[nocturne quail]

I think the host is the client who host the game and has authority

[oak pond]

oh so C is the host in this image

[latent heart]

Correct.

That can be either a dedicated server (no player) or a listen server (has a player)

[oak pond]

that makes sense then yeah

that reminds me that I always forget to playtest in other ways than just as client

[nocturne quail]

this is the dedicated server?

[latent heart]

Yes

[nocturne quail]

I will definitely use it

also the project will open source, so people can correct my working dirty code

😄

[latent heart]

Just to confuse things, you can get P2P networks where there is a single authority, but that's decided by the group and doesn't have to be respected. As everyone talks to everyone, you can say whatever you like "behind the back" of the "apparently" authority.

It's up to the machine you talk to to verify everything you say with the authority.

[nocturne quail]

fine, I will not do P2P , Unreal has already a beautiful model I think

[latent heart]

Unreal has the best model for gaming. By a long way.

But it's not the best for every type of game.

For instance, some games which use multiple servers and a lot of databases, might have a tiered authority system.

[nocturne quail]

for the game like Arma it is best I think, I will not be using any sql db's, and already using 99% C++ for everything except bp animations and state machine and blendspaces

tried to do blendspaces with C++, but it needs to hard ref tons of animations, thats why choosed editor to do this job

[keen hound]

@latent heart yo what should I use for dedicated servers? AWS and Azure seem to deny my debit card so I think I need a third party

[quasi tide]

Pretty much w/e you want

[keen hound]

the vps I was using dropped the fact that they don't support game servers

so I can't use them

[quasi tide]

Pretty weird to be honest. It's just a program.

Digital Ocean should be fine

[keen hound]

Yeah it was definetly the vps too

since the server worked fine on my pc\

[lost inlet]

I guess game servers are CPU intensive and it's an oversubscribed VPS provider that cut off people that use x% CPU for y amount of time

(though DO do that lol)

but with DO it's 100% CPU for a certain amount of time because they think you're mining

[sinful tree]

https://tenor.com/view/jeremy-clarkson-hard-hat-train-gif-22782744

So just need to duty cycle the mining

[meager fable]

is there a delegate that fires when we leave the session on any reason(kicked, left, timed out etc)?

[wind moat]

where is it?

[nocturne quail]

not decided yet but I know about github or gitlab

will upload it there once completed

[wind moat]

Aight, ping me then xD

[stoic acorn]

Hi, I'm using the Advanced Input Actions on a Character Actor (Armour) that I want players to be able to possess. When it's the server the Armour can move fine but with the client it doesn't move.
Any ideas why?

p.s. When I use the previous InputAxis Turn & LookUp it works fine.

[stoic acorn]

nvm I figured it out. For those that care, here's what I did.
I was using the Event Possessed to add Mapping Context but of course that's only run on the server. I added a custom event and use the overlapping instigator controller on the Enhanced Input Local Player Subsystem node. Seems to work now

I'm actually failing to see why the Enhanced Input mapping is better than doing it the old way

Seems fiddlier to set up

[thin stratus]

@stoic acorn You are aware that you are adding that on EVERYONE, cause you are using a Multicast?

Also there is OnControllerChangedEvent you can override that calls locally and on the Server

No need for an RPC

[pallid gorge]

Hi guys I need help with a dialogue still
This blueprint is in my PlayerCharacter

This is in the NPC blueprint, why it doesn't call dialogue server?

[calm prawn]

Hi. Why the player state is not called inside game mode?

[dark edge]

maybe the those player controller's player states are not BP_Master_PS

print the player state, what is it?

[calm prawn]

In widgets and other places, I can call it.

Another thing is to call c_call (client) in player controller -> s_call (server)-> get player state

[dark edge]

Print the player state, what does it print?

[calm prawn]

When I saved to player state, I should have saved with the server? c_save -> s_save -> save to player state?

[short arrow]

You should be able to get the playerstates just fine in the gamemode, however the gamemode only exists on server, so if you're trying to do anything in there as a client that might be your issue

otherwise there's a problem with your code

[calm prawn]

On EventOnLogout I'm tryint to cast to the player state, so I can get some info to destroy a gamelift session

[short arrow]

If event on logout happens after the controller disconnects, it's possible that the reference to the playerstate is no longer valid. You should try to get the playerstate before logging out and see if that's the case

[calm prawn]

I've tried from player controller.
Tab -> server_call to game mode -> game mode cast to player controller -> get player state from player controller -> cast to player state -> get the info and it's not returning anything. But I suspect though, that I should have saved on the server at first the game state infos?

[chrome bay]

Wait you're casting the GameMode to a Controller? That ain't gonna work.

[short arrow]

yeah I'm confused, screenshots would help

[chrome bay]

Also once the player has logged out, they are disconnected from the session - they can't make any Server calls.

The Server should be handling backend session management, clients should never deal with that

[calm prawn]

Not going to work like this? 🙂

[limber gyro]

hey guys, im printing some values on "InitNewPlayer()" but the values are returning 0, even when playing as dedicated server

if (HasAuthority())
{
GEngine->AddOnScreenDebugMessage(-1, 3.0f, FColor::Green, FString::Printf(TEXT("GetNumPlayers(): %f"), GetNumPlayers()));
GEngine->AddOnScreenDebugMessage(-1, 3.0f, FColor::Green, FString::Printf(TEXT("playersPerMatch: %f"), playersPerMatch));
}

players per match is just a variable i set to 2 in the .h

am i missing something here?

[chrome bay]

Should work. The Gameplay Framework does all manner of stupid and unspeakable things when a player logs out to the Player States, but AFAIK that would work.

But since that info is not replicated and is server-only, it's probably better on the Player Controller anyway.

Player State is really more for sharing data with clients, and they are also swapped, duplicated, moved around a lot etc.

[stoic acorn]

Here's a thing. I have 2 teams, TeamB players can possess and control a variety of 'Armour' items.

1. When they possess an item I'm hiding their character mesh and disabling collision while they're 'out of body'.
2. I'd like to be able to unpossess the Armour with a button press and have them re-possess their original character.

Question
What is the best way to retain a link between all Characters and the Armour they're possessing?

My guess would be to store a variable on the PlayerController in question as it's only the server and owning client that care about that connection, but I'm often VERY wrong 😮

[cosmic trail]

Is there a proper way to handle collision prediction between two players when say they are heading at each other? Small differences in position may make one player swerve left on the server vs. right on the client and vice versa. At high latency, this will require a very jerky reset to the correct swerve direction before continuing prediction. Now imagine this with more than 2 players and it starts being very hard to control

[limber gyro]

are you using the character movement component?

the CMC should handle all that with smoothing and replication

afaik

[cosmic trail]

I have my own custom CMC(since RTS for lots of units). I know it keeps a movement buffer and acks moves, but I haven't seen how it can get through this particular scenario without a big jerk

[limber gyro]

if u have ur own custom cmc then u probably know way more than me about this

[sinful tree]

Yeah you could store a reference to their original body in the player controller, that should be fine if no one else needs to know about it.

[limber gyro]

i think theres a variable that allows you to set how big the error is before u get rubber banded

have u tried messing with that?

probably not the best solution but could help a bit

theres also some variables that let u ignore corrections but im not sure those would help u

since its a rts maybe it could work

[cosmic trail]

so the problem is kind of like going through an obstacle. In the prediction, we go left around the obstacle, on the server it goes right. With say 150ms delay and enough speed, the player may get halway through the obstacle on the left side, but then the server message comes back and says, no, you should be on the right side. So then you kind of are forced to not do smoothing and jerk it to the right.

because if you do smoothing, you'd smooth through the obstacle

[limber gyro]

so its a pathfinding issue

[cosmic trail]

not really, since it involves player vs. player collisions, which pathfinding doesn't do

the other player is the obstacle

[limber gyro]

i would love to help but i dont have a solution for that, its a bit above my head

i feel like u probably need to do some sort of validation

to be fair 150 ms now a days is a bit of an extreme case

so if its working fine with say 99ms i wouldnt worry about it

im getting about 30 to 40 ms playing with people from india/america with a server hosted in europe

[tepid lark]

bro how

[limber gyro]

tbh i dont know, my server is quite simple tho

only 6 players tops with a few extra actors

i assume that helps

[tepid lark]

maybe less info going through the internet tubes

[tepid lark]

I don't know what I'm talking about... but what if you override the correction and prefer smooth movement over correct movement

[graceful flame]

But if you do smooth movement over correct movement wouldn't they drift even more out of sync because smooth movement takes longer?

[tepid lark]

yeahhh once I said that I started thinking of a bunch of scenarios where that would be problematic, like being on the other side of a wall

[graceful flame]

So it would be constantly having to do smooth corrections instead of just one quick snappy teleport to the right position.

[tepid lark]

oh I don't mean like smooth corrections, I mean have an acceptable radius of not correcting the position

[graceful flame]

That opens the door for desync though

Say you're making a racing game and there's a fork in the road and Player A is aligned to go left and Player B is aligned to go right but there's a lag spike just before Player A decides to change direction and follow Player B to the right instead of left. The server thinks Player A is still going left because it didn't receive the inputs to go right. So it would have to issue a correction which appears like a teleport for Player A from right side back to left.

[tepid lark]

I suppose that's why network programming is a specialization

[graceful flame]

and if it didn't issue a correction then Player A and Player B would see different things and the desync chaos takes over

[tepid lark]

can you smooth over the obstacle

(take the mountain pass)

[graceful flame]

and if you let clients have authority over their position then cheaters can just fly their cars and teleport to each checkpoint then the finish line like its no big deal

[quartz iris]

I have text on the front of each player's house, how can I show the name of the player who owns the house? I have a variable with the controller for the owning player inside the house bp

[sage light]

when I travel to a new server as a client,do my actors save their variables? or is the entire game loaded as new besides of the game instance?

[hollow eagle]

don't use the controller, controllers only exist on the owning client and the server. Other players cannot access the controller.
Use the player state instead, which incidentally also includes the player's name.

[sage light]

Also, a player opens the game build, will they always be standalone if they are not connected to server? or can they be client?

[wheat niche]

hey is there a lobby leave function?

[dark edge]

use playerstate

not controller

[pallid gorge]

It is so wonderful

[lost inlet]

in single player with no network connection, netmode will be NM_Standalone

NM_ListenServer if hosting a game

[cosmic trail]

yeah, even with limited client authority, you still have other clients that will need to snap back since they got the server's version first before correcting to the other client.

[sage light]

Thanks

[slim mist]

For some reason when a client joins they are switched to a spectator momentarily after correctly spawning as a pawn. Does anyone know why?

[latent heart]

Do you have bDelayedStart set to true?

(in your game mode)

[quartz iris]

Let me guess the player controller isnt replicated or something?

Am I getting the player's name from the playerstate?

[hollow eagle]

#multiplayer message

[quartz iris]

Ah got it

So I can just change the variable to player state?

Everything will work?

[pallid gorge]

Why is a wonderful day today

[tepid lark]

momentarily after spawning, they are being switched to a spectator. jk but more info is needed to help with that.

[stoic acorn]

Can't pawns commjnicate with the GameMode through an interface?

[sinful tree]

If you're running on a client, clients do not have access to the game mode at all.

[dark edge]

Probably not but you def don't want to try to ever care about a playercontroller that's not your own.

[tepid lark]

but can't the client ask the server to get info from the game mode... which is kind of like accessing it?

[stoic acorn]

I'm trying to unpossess a character and repossess it's original body. Can't figure out where to put the code

[sinful tree]

At that point you're no longer running on the client. Client would need to RPC to server, server would be able to access game mode through interface so long as the game mode implements the interface or through casting and directly accessing the functions of the game mode.

[tepid lark]

something weird happens when you unpossess a character. I don't remember what though

[sinful tree]

Player controller would probably be the best place to handle it. Client sends RPC to server request, server validates that they can switch back to original body, server has controller possess original body.

[stoic acorn]

What's weird is that I can possess a character with overlap that communicates to the game mode (which is handling the possessing code)... but I can't do the same with a keypress

[sinful tree]

Thats because overlap events occur on both the client and the server. Keypresses only occur on the client.

[stoic acorn]

aha, that makes sense

[quartz iris]

Hm this doesnt seem to work

[dark edge]

where are you setting player who owns house?

and why is it not replicated?

[quartz iris]

This is in this gamemode (below)

[quiet cairn]

hey all, I'm using AInfo derived class to store player XP. I generate the AInfo object on the server and it has correct property values on the server. but once i try to either pass it to the client or try to read from the replicated variable on the client, i get an empty AInfo object (the properties are set to default instead of my values). the AInfo derived class replicates and is always relevant. the properties on it are not replicated (but i've tried replicating them too -- same result).
does anybody know why that would be?

[dark edge]

this can just be an onrep

onrep playerwhoownshouse -> set text or whatever you update

[quartz iris]

It just shows Text in game though

[dark edge]

you never set Player Who Owns House

also you have a bit of a data race / sync problem

the pawn has the house it owns

and the house has the playerstate who owns it

what if they disagree?

[dark edge]

wait what is New Player?

a playerstate or playercontroller

[quartz iris]

player controller

of the player who joined

[quartz iris]

.

[dark edge]

OK so when do you set PlayerWhoOwnsHouse?

[ocean geyser]

is there a function or something to call that can force a variable to replicate? for example i have a replicated array that sometimes when modified will end up being the same, but it utilizes the OnRep to actually do something so i need it to actually replicate back down to the clients

do not

other option ive considered is a struct that contains said array with a replicated uint8 and just tick up that uint8 each time it changes

yes, but given that there are some cases where when the array gets changed, the end result remains the same (oldarray != newarray) it does not trigger replication of said array

yes sorry

basically refreshes a bunch of uobjects

going to try marking it dirty and setting the property to use the push based model and see if that does it

nope still treats it as normal even without being marked as dirty oddly enough
edit: nvm aparently that is a config setting (not sure if related to iris?)

[ocean geyser]

alrighty set it up to work wish push model and all that worked fine and as intended (planned to do this anyways) but same result. not sure of a way to force it to replicate aside from something like the above incrementing a uint8 alongside it to trigger it

could. ill try to refactor it, theres another way it can be handled that might be better overall

[hot pebble]

Hello everyone! so I just packaged my game for the first time (I'm new to UE) and I have my main menu with a create session and a join session UI, but it doesnt seem to do anything, has anyone encountered this before?

It works fine in the editor, I dont know if im missing something

I don't know if this also happens to have an issue with loading a new map, do you have to select which maps to export when you package a game?

[icy jetty]

yes.

[hot pebble]

Omg thanks this fixed it! I appreciate it 😁

[wanton bear]

in my animation blueprint event graph im getting the camera pitch and storing it in a variable, but when i print the string playing as listen server, the value alternates between what the value should be and some fixed amount

it also seems its accessing none trying to read property camera when the event first runs despite checking if the character is valid at the start of event blueprint update animation

[sinful tree]

Show some code as to how you're reading the value in the anim BP.

[wanton bear]

literally just getting the camera component from a validated character and getting the yaw and setting a value

if i remove all the math and print like this

values are all over the place idk

[keen hound]

do I need the playfab sdk to use playfab

[sinful tree]

This only happens on listen server? What happens if you try dedicated or standalone?

[sinful tree]

There's probably some plugin they have in order for it to be used with Unreal.

[wanton bear]

i switched to controller rotation and seems to be more reliable. not sure why it prints the actual value and the default value one after the other like that, but appears to be working

i say it works... it works on the client now but does nothing on the server

be replication problem somewhere

[eager flare]

i heard linux is the best os to host ur game server is that true?

[sinful tree]

I'm speaking more in terms of Linux based operating systems in general and not for game servers specifically, but most often Linux servers run cheaper as they don't incur additional licensing costs for hosting providers so you usually get some cost savings, and there is usually less impact on available resources (like CPU time and RAM) when running a Linux server vs. running a windows based server. I'd argue that it's probably more important to work with something you're familiar with as trying to use an OS you may have never touched and as advanced as Linux can present a very large learning curve.

[eager flare]

yeah ill use windows since its what im comfortable and familiar with

ive heard u need to type lines of code just to change the background

[lost inlet]

Well that's not true nor relevant to a headless server

Linux really isn't that hard for the basics

You can compile the game server executable from Windows

[wind iris]

what is right workflow to host dedicated server ?
Can we finish multiplayer whole game ue5.1 first
than build unreal from github source.
host gamelift ?

Can someone help me in this area ?

[fossil spoke]

You could, but its not a good idea. Since you are likely going to run into endless bugs on the built dedicated server which wouldnt have shown up in Editor.

You could test your dedicated server locally though.

[wind iris]

@fossil spoke
Ok,
I have start from source build Engine than start working on content & gameplay for multiplayer. Right

is it epic team workflow ?

[fossil spoke]

The source build simply allows you to compile a dedicated server executable

You could start with the launcher build.

[wind iris]

what is difference in Visual Studio option Server Build on BUild VS?

is it only for locally testing game ?

I'm more confuse Now 🙂

[rocky kestrel]

What is best way to profile dedicated server? I have mmo style game and it works players can play on server etc.. but sometimes server crash and I have no idea why.

[rocky kestrel]

Okay I found network profiler!

[chrome bay]

Profiling will give you performance metrics but not crash dumps. You need to analyse the crashes to see why

[untold rose]

Am I right in understanding that when a var that is repNotify is updated on the server, the rep notify event would call on all clients?

[chrome bay]

When clients receive it yes

They behave differently in BP vs C++ though. Such is the unfathomable genius.

[untold rose]

Strange, I have a bool that's repnotify but when updated by the server, the repnotify event doesn't call on the client. o.O The rep event calls on the server though so im a little confused haha

[chrome bay]

Paste codes

[untold rose]

Nm, forgot to tick 'replicates' in the main BP haha. 🙂

[potent token]

in MOBA game, for minion(pawn) that out of sight, does the minion still get rendered ?

[real ridge]

when I override it then what?

[quartz iris]

Why does this damage code work with the server shooting the client but not the client shooting the server?

For most of my code I need it to work for the clients because at the moment it's only working for the server

I'm just not 100% sure why the clients aren't recieving info

[chrome bay]

Presumably because the client is not the owner of the actor. Clients shouldn't be telling the server to damage things anyway

The setup is very odd anyway

A multicast to set a replicated var

[junior valley]

Hi everyone, I'm trying to make a split screen multiplayer co-op game in UE 5.1, but each time I try to move the character with a game pad, it still moves the first player and won't move the second, even with "Skip assigning Gamepad to Player 1" ticked. I have got the spawning a second player down, I just can't seem to move it. Does anyone know any work arounds?

[quartz iris]

How should I be doing it?

[flat spoke]

why is my dedicated server closing, when accessing him from editor ?

with build client it's fine, but ... that's odd !

MissingLevelPackage it says

[tepid lark]

ok wtf. been dealing with all kinds of issues with listen server stuffs. reverted project to a state where the problems didn't exist... yesterday movement was working just fine. today I'm getting the old issue of jittery movement and host looks like they're falling on the client screen. literally wasn't doing this yesterday.

[chrome bay]

Server applies damage and changes the health value based on what happens on it's end. Clients receive the value and respond via the Rep Notify

Clients should never change replicated variables

[quartz iris]

How do I do it tho

[woven basin]

Why does AGameModeBase::PreLogin() not have a reference to the type of person trying to login?

A listen server is treated the same as an external user? So for doing password check, version check etc, I have to pass all the details to myself? Is there a way to just skip this for the server?

[stoic acorn]

could you use switch has authority and if it is Remote do the password check, if it's Authority do nothing, or skip to the next stage of your logic?

[latent heart]

Chances are Address will be 127.0.0.1 or soem such

[stoic acorn]

I'm a noob so take that with a pinch of salt

[latent heart]

Check what it says when you (pre) log in?

You could also try checking the netmode. If it's ListenServer and there's no players connected (gamestate->playerarray) then it will be the host.

[woven basin]

This might be what I need.

So if I want extra stuff to end up in ApproveLogin(), which only gets Options passed to it, I can have the client send the extra data via this? I'll give it a try

[quartz iris]

@chrome bay I'm not really sure how I should be formatting my code so that all clients know what is happening

[woven basin]

the code is always running on the server, so the local is always authority

[woven basin]

hmmm - yeah, this would work. If no one is there, this is the first user, let them in...

[thin stratus]

String stuff yeah

Also how long ago did I answer that

[woven basin]

3 months, sorry, didnt mean to necro, I was searching

[thin stratus]

Ah no worries

[latent heart]

Not necessariyl a good idea on a dedicated server.

There might be reasons you don't want a user or particular users to join.

[woven basin]

yeah - I'll try Exi's way - I think that is what I want

Its really annoying that we ApproveLogin on the listen server for the host themselves. If you reject it for any reason, it is a hard crash - lol

[thin stratus]

Maybe read the compendium once more and/or look at existing code. There are some courses too. It might take a bit to get used to multiplayer but building your game on a broken base knowledge is a really bad idea

[quartz iris]

I haven't found how to do it properly anywhere

[thin stratus]

That can't be true cause the stuff James meant are basics

The replicated variable already takes care of replication for the health. The Multicast is redundant

[quartz iris]

But why is it not working for the clients

[tepid lark]

because none of this is actually real.

[latent heart]

It's unreal.

[quartz iris]

I swear nobody knows this is why I can't find any info on it

😢

[tepid lark]

have you tried looking at any example projects and reverse engineering how they do it?

[quartz iris]

I have but it can be overwhelming

[tepid lark]

understandable. you're trying to set up damage right now?

[quartz iris]

Yeah

[sinful tree]

That OnRep function is fired when the playerstate has been replicated and should then be valid. You can use that override to then trigger other functions or broadcast an event dispatcher.

[tepid lark]

instead of using that any damage event... can you create a bp actor for a projectile as an example. and when that projectile's collider overlaps, check all overlapped actors then cast them to your player character. have a server rep'd event called receive damage in that character which is called from the projectile's overlap. the server handles applying the damage to the characters.

I'm realizing that saying that out loud probably doesn't help and a tutorial would be better lol

[sinful tree]

AnyDamage is called by ApplyDamage. Apply Damage can only be executed when you're already running on the server. The trick here is, is that you don't want to necessarily have a client telling the server to apply the damage, as the server should already know if the damage should be applied or not - eg.You'd spawn a projectile on the server that has an overlap that triggers Apply Damage, then the server should already know when the projectile overlaps and then it will properly call Apply Damage.

Your Health variable should be set as an OnRep variable. This means when your AnyDamage event is properly triggered, you can set the health variable as you need and it should reduce the health of the particular character and replicate it to everyone. The OnRep function for the health can then trigger whenever the value is changed on the server for any other clients, and then the clients can do any additional things you need, like updating UI and the like.

Your best bet may be to place some print strings around so you can see the flow of things.

[tepid lark]

I forget how useful the OnRep variables/functions are

[latent heart]

They are the usefullest!

[quartz iris]

This is like when you buy your first pc after using a console your whole life

[tepid lark]

also sidenote I think I found what was causing my weird issue... there is a spectator class that spawns in before the hero class. changing the spectator class' attributes to something other than the hero class' attributes (i.e. spectator attributes) messes things up. so for future reference, don't change the default attributes gameplay effect, modify them via separate gameplay effect modifiers instead.

[quartz iris]

So I shouldn't be using multicast for the stuff that I do with animations etc?

[halcyon totem]

does event post login take place after the server travel?

[sinful tree]

You usually multicast for visual / audio things that don't matter to gameplay. If there are variables involved you want players to know about and when they change, you use replicated w/ OnRep.

[quartz iris]

Ok, I think I understand a bit more, i guess its strange to me that all variables changed on the server arent changed on the clients and you cant do it with multicast

[sinful tree]

You have to declare which variables are replicated - they don't replicate everything as not everything needs to be replicated. So if you mark a variable as replicated, it will make its way to the clients if it's on a replicated actor that exists on the clients (ie. Player Controller only exists on the server and the client who is that player controller, so it can't replicate to anyone else. GameMode only exists on the server so no variables on it can be replicated on clients as clients can't even reference it, PlayerStates are always relevant and replicate to all, so they will always be replicating their replicated variables to all clients). Using OnRep is still making a variable replicated, but it gives you a handy function that gets called when the client receives a change.

There are conditions you can put on replicated variables too that can alter the replication behavior, like skipping the owner, owner only, etc.

[tepid lark]

If you're using seamless travel, no. If you aren't using seamless travel, think the answer is yes. but you can test with prints. actually I'm not even sure of this, test it yourself lol

[oak pond]

whats the best way to replicate individual animation montages? do I make an event for every time one is used, or is there some way to do it with one event or something?

[drifting heath]

Hey all. I have an issue where my overhead widget for actors is showing at 0,0 in client, but is properly overhead in standalone/listen. I didn't think a component had to be set to replicate for things that are created at construction. Am I incorrect? The widget itself reads replicated data on the actor component, so the widget itself has no reason to replicate.

//header
    UPROPERTY(VisibleAnywhere, BlueprintReadWrite)
    UWidgetComponent* OverheadWidget = nullptr;
//source
    OverheadWidget = CreateDefaultSubobject<UWidgetComponent>("OverheadWidget");
    OverheadWidget->SetupAttachment(GetRootComponent());

Static widget, with static transform relative to the root capsule. All it does is read on the tick for current hitpoints, and set the name/level at run time.

After running in standalone, it seems to be working fine now. 🤷‍♀️

[tepid lark]

good job lol

[drifting heath]

Still having problems lol. Nothing works, until I run it in standalone, then it's fine after that.

Current issue is in standalone, the widget wil lface the camera. In client, it faces actor forward

[real ridge]

I did it thx

[quartz iris]

How can I redo this code to work properly with multiplayer?

2nd half

This is for a aiming system (in third person)

[stoic forge]

Trying to wrap my head around multiplayer widgets. I have an actor that calls an event on the player character to spawn the widget (1st image), and then on the player character side I have a multicast to create the widget, which is then called by the server. This works and the widget is added to all players screens it seems.

On the widget i have a "close button" that calls a multicast/server function on the player character to remove the widget(3rd image). and it works as long as I use the "server" character, but I get an "access none" when doing it with the client and I'm trying to wrap my head around why.

goal is to have the window close for all players not just the owning player

[dark edge]

because a client can't call a multicast

delete every multicast from your project

that'll force you to do it the right way

then re-add them for the correct use cases (temporary things)

[dark edge]

there's no such thing as a multiplayer widget

widgets don't network

[stoic forge]

Im aware, i was saying that in context to what im trying to get to work

[dark edge]

if you want a button press on a widget to do something anywhere but on the client, you need to call THROUGH a thing that can netowrk

[stoic forge]

I believe that's what im doing by using the player character no? As the player character is replicated

[dark edge]

any time you're doing get X 0 my alarm bells go off

that's a bad idea

get player 0, get pawn 0, get playerstate 0 all of that

[dark edge]

that should be an onrep tho

OnRep bWindowShouldBeVisible

and it should live in the gamestate

or some other replicated actor that everyone has at all times

[quartz iris]

So multicast is only for sounds and animations? pretty much?

and I should repnotify anything I want the clients to know

[dark edge]

You should repnotify anything that is state

if a door is open, the health of something, the currently held item,

only multicast things where it doesn't really matter if it happens or not

[quartz iris]

Ok

So i'm getting rid of the multicast for the aiming animations etc

I guess I could do a repnotify on aiming and play the animation montage there

[dark edge]

There are use cases for RPCs for stuff, like CMC uses rpcs and not replicated variables, but that's fairly advanced and not something to worry about right now.

[coarse gale]

Im runing a script on the server when it starts to generate a variable, Im doing it in the game mode blueprint, I need clients to have access to the variable but they don't seem to be able to cast to the game mode BP, what is the best way to do it.

Like, I could just create an actor bp and drop it in the level, run the server script on that and replicate the variable which the clients could access, surely there must be a better way ?

[outer sphinx]

Hello, a question, how can I "possess" (event on "possess") a character in a mmorpg project? I want to make a mount system but I don't know how I can possess the client character with a horse (the horse is the other character)

[oak pond]

funnily enough I was asking about animations earlier

still pretty clueless on what to do other than manually creating an event for every montage

[sinful tree]

Game Mode is only available on the server. Game State may be the actor you want to use as there's only ever one in a level and it is replicated to clients.

[sinful tree]

The same way as in any other multiplayer project. You use a "Possess" node while your code is running on the server feeding in the appropriate player controller and new character you want to possess.

[glacial grove]

Hi I know this question might be more specific to the physics channel but since it is also Multiplayer and replication related I am also asking in this channel. I am working on an Multiplayer project based on the chaos Wheeled Vehicle system in 5.1 on the Server side and in single player everything works fine but on the client side the movement just is jittering and resetting the vehicle to an previews position. The documentation & Tutorials only seem to work in 4.27 but not in 5. Is there any way to fix this?

[sinful tree]

There's many ways to approach it. A very basic way would be to add an input on your event.

[oak pond]

but this way is still just making an event on every place that plays a montage right?

[sinful tree]

It'd be a single event and you feed in a ref to the montage you want to use.

[oak pond]

ah yeah, I was wondering if it could be something like that

maybe thatd be fine then

I did try something like that before but I think I just went about it the wrong way

[coarse gale]

Thanks, ill look into the game state

[drifting heath]

...
    UPROPERTY(VisibleAnywhere, BlueprintReadWrite)
    UWidgetComponent* OverheadWidget = nullptr;
...
ANpcCharacterBase::ANpcCharacterBase()
{
    PrimaryActorTick.bCanEverTick = true;
    bReplicates = true;
    OverheadWidget = CreateDefaultSubobject<UWidgetComponent>("OverheadWidget");
    OverheadWidget->SetupAttachment(GetRootComponent());
}
void ANpcCharacterBase::Tick(float DeltaSeconds)
{
  Super::Tick(DeltaSeconds);
  const APlayerController* PlayerController = GetWorld()->GetFirstPlayerController();
  if (IsValid(PlayerController))
  {
    const APlayerCameraManager* CamManager = PlayerController->PlayerCameraManager;
    if (IsValid(CamManager))
    {
      const FVector CamLocation = CamManager->GetCameraLocation();
      const FVector fVector = GetActorLocation();
      FVector NewRotation = (CamLocation - fVector);
      OverheadWidget->SetWorldRotation(NewRotation.Rotation());
    }
  }
}

How do I get an overhead widget on an NPC to face the client's screen, specifically in C++?

Currently, if I play in standalone or Listen Server, it works perfectly. However, in Client mode, it just faces the forward vector of the actor and not the player's screen.

[coarse gale]

@drifting heath Not sure how you do it in c++ specifically, but I believe there is an option like render to screen not world or something

so I dont think you need to manually rotate it, you should just be able to toggle it to render to screen in c++ somehow

[drifting heath]

I'll try that. I figured using render to screen would make it look weird, versus like it was actually above the NPC's head, but I didn't try that yet. I'll see what happens

Yeah... I'm a derp. Nevermind. It looks perfectly fine using screen, and functions properly.

[coarse gale]

well it depends what you are going for, like screen may make it show infront of objects im not sure, that might not be what you want so...

[drifting heath]

Yeah it's showing through objects but that can be fixed.

[arctic minnow]

Do I need to run spawn sound at location on multi cast and server or just server?

🙂 🙂

🙂 🙂

[coarse gale]

Depends if the server has speakers or not

[lost inlet]

still not sure what's up with the 2x2 emoji grid that you post with every message

a multicast call on the server runs on the server and all relevant clients

[quiet fjord]

Guys, can someone help me with a bug that I have in a multiplayer game?

Is it happening to me that when I start a game I activate a cinematic where the players see it and when my game mode ends it takes care of owning the players but sometimes there are players who don't own them because it's due?

[clever cipher]

Anyone know why the ping is always 9999 using Steam Sessions? I didn't have this problem on another project I used Steam Sessions with.

[uneven lion]

If I call SpawnActor on the server and then immediately call a NetMultiCast, Reliable function on said spawned actor, the client never receives the event. I also tried calling my multicast event in BeginPlay if HasAuthority(), and still no. Do I have to put it in PostNetInit or what's the right play here?

Actually, I can do this with an OnRep so I'll try that 🙂

[worn steppe]

hello multiplayer discord, it has been a few months, but I am back to working on this networked project. i can't wait to royally screw this project up as I have managed to forget everything I learned. gonna be so MUCH FUN 🫠

[latent basin]

Same boat haha

Make sure you have source control

[worn steppe]

that is an exellent idea, why was this not in source control? my past self has been slacking

oh yeah, because it's kind of a pain to put all of these binaries into source control.. maybe i'll exclude them or learn git lfs or something

[latent basin]

You can set up github sc easily

https://www.youtube.com/watch?v=Lg-UATetjbY&ab_channel=SkywolfGameStudios

[worn steppe]

Thanks, I didn't know github had a nice unrealengine .gitignore file, I'll be stealing that. I think I am going to use git lfs for the binary assets though, but I will be using bog standard git for everything else

[latent basin]

Awesome, no prob 👍

[worn steppe]

woah github private repos are free now?

[whole pine]

how do i make seperate inventories for separate players

[worn steppe]

I store the player inventory on the ACharacter class

[near granite]

Who knows why AI Move To not working in multiplayer..dedicated server

[limber gyro]

blueprintImplementableEvents from pawns spawned in the server will only run in the server?

nvm, their not running at all

[dim trail]

Has anyone profiled spawning actors on the server?

[arctic minnow]

What do you mean 🙂

[dim trail]

I’m debating between making my respawn mechanic just a teleportation and reset vs destroying and spawning

[drifting heath]

If you're using a system like Battlefield, where you're using the same model, same settings, same everything, that would probably be better.

If you're using an RPG style system with randomized loot tables, percentages, etc.. I'd opt for destroy & respawn

[valid bough]

If someone can please help me, I'm attempting to do 2 things, when I shoot from the hip it shoots at the center of the screen. Which works. But when I ADS I want to shoot from a socket I created called "frontSightPost". So its always center when you ADS. For some reason even after replicating, it is always at 0,0,0 or some random value. ADS is replicated, I've tried ChatGPT for 2 days, still not helping lol. I am at a loss. This is C++. ```void AFPSCharacter::StartFire(const FInputActionValue& Val)
{
if (CanFire()) {
if (CurrentWeapon) {
bCanFire = false; // Disallow firing

        // Only set a timer for automatic weapons
        if (CurrentWeapon->bIsAutomatic) {
            GetWorld()->GetTimerManager().SetTimer(FireTimerHandle, this, &AFPSCharacter::ResetFire, CurrentWeapon->FireRate, false);
        }
        if (HasAuthority())
        {
                Fire();
        }
        else
        {
            ServerStartFire();
        }
    }
}

}

void AFPSCharacter::StopFire()
{
if (CurrentWeapon && CurrentWeapon->bIsAutomatic) {
// For automatic weapons, clear the fire timer when the button is released
GetWorld()->GetTimerManager().ClearTimer(FireTimerHandle);

    // And immediately allow firing again
    bCanFire = true;
}
else if (CurrentWeapon) {
    // For non-automatic weapons, reset fire immediately when the button is released
    ResetFire();
}

}

void AFPSCharacter::ResetFire()
{
// Allow firing again when the timer expires, regardless of whether the weapon is automatic or not
bCanFire = true;
}

void AFPSCharacter::Fire()
{
if (bIsADS && IsLocallyControlled())
{
ServerGetSocketTransform();
ApplyRecoil();
}
else
{
// If not aiming down sights, spawn the projectile immediately.
FTransform FiringPosition = GetFiringPosition();
SpawnProjectile(FiringPosition.GetLocation(), FiringPosition.GetRotation().Rotator());
ApplyRecoil();
}
}
void AFPSCharacter::ServerStartFire_Implementation()
{
Fire();
}

bool AFPSCharacter::ServerStartFire_Validate()
{
return true;
}void AFPSCharacter::ServerGetSocketTransform_Implementation()
{
// Fetch the Socket Transform from WeaponMesh and store it in a replicated variable
if (WeaponMesh != nullptr)
{
ReplicatedSocketTransform = WeaponMesh->GetSocketTransform("frontSightPost", RTS_Component);
FVector Location = ReplicatedSocketTransform.GetLocation();
UE_LOG(LogTemp, Warning, TEXT("Server Socket Location: %s"), *Location.ToString());
}
}void AFPSCharacter::SpawnProjectile_Implementation(FVector SpawnLocation, FRotator SpawnRotation)
{
FActorSpawnParameters spawnParameters;
spawnParameters.Instigator = GetInstigator();
spawnParameters.Owner = this;

if (AProjectile* bullet = GetWorld()->SpawnActor<AProjectile>(ProjectileClass, SpawnLocation, SpawnRotation, spawnParameters))
{
    FVector LaunchDirection = SpawnRotation.Vector();
    LaunchDirection *= CurrentWeapon->WeaponDistance;
    bullet->FireInDirection(LaunchDirection);
}
CurrentWeapon->AmmoInClip = FMath::Clamp(CurrentWeapon->AmmoInClip - 1, 0, CurrentWeapon->MaxAmmoInClip);

}

[keen hound]

what is this error>

using playfab btw

[lost inlet]

your gamemode class derives from AGameMode, so BP_CGGGameState needs to derive from AGameState rather than AGameStateBase

[lost inlet]

Why would you request the ADS position from the server, that just seems awful instead of just getting it locally

And it'll make the weapons feel unresponsive in ADS

[covert mirage]

Hello I have a ui button that when clicked, the button will set visibility to hidden on other widget
this works on client, but doesnt work on host, the widget still visible on host, fyi I run the game on Listen Server mode
Is this bug on host mode ?

[lost inlet]

UMG is not going to behave differently on client vs. host, it'll be something else

[wanton bear]

are socket transforms on meshes in characters automatically replicated?

[thin stratus]

Given they are not changed runtime, you could say so. They aren't replicated but should be the same on everyone

At least the relative one

[wanton bear]

struggling to get this ADS to work in multiplayer...

[earnest jewel]

Hello. I am a newbie and I'm having a bit of problem and if someone could even point me in the right direction, that would be greatly appreaciated.
So the issue I am having right now is that things are working fine while playing in Editor, using those NetMode and NumberOfPlayers settings, but the Build is causing more than a few issue.
An example in animations, I've replicated the variables that are used to check states of animations and as I said before everything is working nicely in Editor, but in Build the animations are not playing.
Someone please help me?

[stable grotto]

is it possible to get another dedicated server ping before connecting through BP?

[rocky kestrel]

How to fix this problem? For example if player opens door and then set door rotation Multicast. --> other player joins dedicated server --> doesn't see door opened but collision works still. Only visual.

Should I make timer for example check if door is open every 10s and if it's open then set rotation multicast?

I think this problem also comes if client2 is long distance and client1 opens door. Then client2 walks to that door.

[chrome bay]

Don't use multicast for state. Use a variable and an OnRep

Golden Rule of Replication

[quiet fjord]

Does anyone know how to change values ​​from my gameState to my gameMode playing in dedicated server mode?

that is to say all client

I am trying to do that when a cinematic of the level ends in the blueprint of the level, it calls my gameState with a runOnserver function so that my gameMode does the possessing of the players. This event is marked in Multicast so that it can be carried out to all users but only to me. perform this mechanic well by playing RunOnServer this because it is

[woven basin]

Is it a bug that if ApproveLogin() in GameSession fails in 5.1/5.2 - it crashes the client? What is the point of doing checks there then?

Fatal error: [File:D:\EpicGames\UESource\Engine\Source\Runtime\Engine\Private\UnrealEngine.cpp] [Line: 14939] Couldn't spawn player: Password incorrect

[thin fog]

I wanna ask that how do we add option or widget through which we can just add friends search for friends by username and chat through them via dm (if u have any vid or documentation lmk)

[valid bough]

That’s what I thought, it’s only meant for the client but when I took position of the socket locally it was spawning in a weird angle but worked fine in standalone. Maybe it was a bug that happened after changing code around but I was thinking maybe it was a replication issue so then I switched to this. I’ll go back and swap

[sinful tree]

If you're executing your multicast in your game mode that's why it is not working. Game Mode only exists on the server so the multicast isn't sent to clients.

[outer sphinx]

Thank you very much for answering me, what would be the appropriate player driver? because I use the "playerController" of the "thirdperson" but the system only works with client1. I don't know how to make the reference to the player of each client. If you want privately I'll send you a photo of a basic function I did

[sinful tree]

It depends on what you're using to trigger the possession.
For example, if you're triggering this from an input from the character, you can get the owner of the character which will be the player controller.

[valid bough]

Can someone please help me again : When shooting on the client, the client's projectile seems to be on a positive linear slope when firing in ADS. I take the ADS socket from the client and on the server it works perfectly. But the client its just slightly off on the Z-axis depening on the distance shot. ```void AFPSCharacter::StartFire(const FInputActionValue& Val)
{
if (CanFire()) {
if (CurrentWeapon) {
bCanFire = false; // Disallow firing

        // Only set a timer for automatic weapons
        if (CurrentWeapon->bIsAutomatic) {
            GetWorld()->GetTimerManager().SetTimer(FireTimerHandle, this, &AFPSCharacter::ResetFire, CurrentWeapon->FireRate, false);
        }
        if (HasAuthority())
        {
                Fire();
        }
        else
        {
            ServerStartFire();
        }
    }
}

}

void AFPSCharacter::StopFire()
{
if (CurrentWeapon && CurrentWeapon->bIsAutomatic) {
// For automatic weapons, clear the fire timer when the button is released
GetWorld()->GetTimerManager().ClearTimer(FireTimerHandle);

    // And immediately allow firing again
    bCanFire = true;
}
else if (CurrentWeapon) {
    // For non-automatic weapons, reset fire immediately when the button is released
    ResetFire();
}

}

void AFPSCharacter::ResetFire()
{
// Allow firing again when the timer expires, regardless of whether the weapon is automatic or not
bCanFire = true;
}

void AFPSCharacter::Fire()
{
if (bIsADS)
{
GetSocketTransform();
}

FTransform FiringPosition = GetFiringPosition();


    // If not aiming down sights, spawn the projectile immediately.
    SpawnProjectile(FiringPosition.GetLocation(), FiringPosition.GetRotation().Rotator());

}
void AFPSCharacter::ServerStartFire_Implementation()
{
Fire();
}

bool AFPSCharacter::ServerStartFire_Validate()
{
return true;
}

void AFPSCharacter::SpawnProjectile_Implementation(FVector SpawnLocation, FRotator SpawnRotation)
{
FActorSpawnParameters spawnParameters;
spawnParameters.Instigator = GetInstigator();
spawnParameters.Owner = this;

if (AProjectile* bullet = GetWorld()->SpawnActor<AProjectile>(ProjectileClass, SpawnLocation, SpawnRotation, spawnParameters))
{
    FVector LaunchDirection = SpawnRotation.Vector();
    LaunchDirection *= CurrentWeapon->WeaponDistance;
    bullet->FireInDirection(LaunchDirection);
}
CurrentWeapon->AmmoInClip = FMath::Clamp(CurrentWeapon->AmmoInClip - 1, 0, CurrentWeapon->MaxAmmoInClip);

UE_LOG(LogTemp, Warning, TEXT("Location: X = %f, Y = %f, Z = %f"), SpawnLocation.X, SpawnLocation.Y, SpawnLocation.Z);

ApplyRecoil();

}

FTransform AFPSCharacter::GetFiringPosition()
{
if (bIsADS && IsLocallyControlled()) {
return BulletSocketTransform;
}

    FVector SpawnLocation = GetActorLocation() + (GetControlRotation().Vector() * 100.0f) + (GetActorUpVector() * 50.0f);
    FRotator SpawnRotation = GetControlRotation();

    return FTransform(SpawnRotation, SpawnLocation);

}

void AFPSCharacter::GetSocketTransform()
{
if (this->WeaponMesh && IsLocallyControlled())
{
BulletSocketTransform = this->WeaponMesh->GetSocketTransform("frontSightPost", RTS_World);
}
}``` I used debug spheres and the socket/spawn location of the projectile is correct , i replicate ADS correctly, everything is working as intened except the path of the projectile which I dont understand. This is UE ver 5.2.1

[vivid seal]

hi guys, i'm once again trying to get client-predicted projectiles working. The current approach I'm taking is spawning a client projectile, then RPCing the server with the firing info. The server then spawns their projectile, and that projectile ticks twice as fast until it has "caught up" with the client (basically i only tick twice as fast until the amount of extra tick time equals the client's ping), then the server projectile replaces the client projectile. Before catching up, the server projectile is hidden on the client.

The issue i'm having now is how to handle predicted hits before the server's projectile catches up. For instance, if a client hits someone point-blank with a projectile, but the server (receiving the firing RPC later) won't hit the same thing as it has moved. Should I be doing server-side rewind for projectiles, or just ignoring client hits with the fake predicted projectile and only using the server projectile?

[wind moat]

Hey, anyone knowing a quick and good way of creating servers for your game, that still do work and communicate with Steam?

[graceful flame]

The "quick" way is to just use Listen host and a marketplace plugin. Otherwise if you want to use dedicated servers it's a lot more complicated.

[young spoke]

i'm no expert but i think at some point, the server will have to trust client view under certain parameters

if the projectile firing and collision is faster than the average round time trip of your rpc firing, then the client view will be more correct and server view will always be slightly wrong , especially if the target moves at last second

so i feel like in these specific instances, the server should go with the client view and not kick off correction logic

i could be totally wrong though

[wind moat]

any recommandations for marketplace plugins?

[forest fulcrum]

hello guys was having a issue im trying to make replicable a mesh from a PAWN , but can make it happen was trying to make variable replicated and not work

how can i achieve it

[meager spade]

you should not replicate the character mesh

[forest fulcrum]

instead the PAWN?

[meager spade]

i am not sure what you are doing here

what you trying to do?

you seem to be doing everyone on the local client

you should tell the server

to do this stuff

so pressing E should tell server to possess the hoverboard

then you need to make sure all collisions are propogated properly

its not as simple as doing what you are doing

[forest fulcrum]

im trying with and RPC but server posses the hoverboard and dont need that

[meager spade]

your using playercontroller 0

dont ever use that node

get the proper controller for the pawn

right click, get controller, cast player controller

these should not be used, unless you know what your doing

they are bad

[graceful flame]

Advanced Sessions + Advanced Steam Sessions was the plugin of choice but last I heard it wasn't working so well with UE5. So I dunno, I don't have any other recommendations.

[forest fulcrum]

right there?

[meager spade]

no

you want the players controller

not the hoverboard..

just right click get controller

and dont pass in the hoverboard

[forest fulcrum]

this throw this error

[forest fulcrum]

do u have free time to try to help me to fix that?

[meager spade]

why is it a multicast

i never said do a multicast

@forest fulcrum

[oak pond]

is there a way to make players possess an actor in the map, instead of using a playerstart?

[sinful tree]

Remove the default pawn class in your world settings, place and select the pawn you want the player to possess and look for the Auto Possess Player setting and specify Player 0.

[forest fulcrum]

Was thinking multicast, allow to all clients watch when a player is on a skateboard, my game is a skateboard multiplayer

My approach is player action ->RPC server-> fire event in all clients using multicast

[oak pond]

did that already, it just spawns default players still

or rather, doesnt spawn in anything if theres no default pawn class

I can do it with a possess node in the actor, with a signifant delay enough for the player to have joined, but theres no way thats gonna be reliable

yeah this is dumb

already searched all over for anything about this and couldnt find a thing

all I need is to be able to spawn players with some variables set specifically for different maps, but guess Ill have to rely on another actor for that

[dark edge]

Auto possess option

It has to at least be a pawn

[oak pond]

but I just

[dark edge]

You don't possess actors

[oak pond]

yeah its just my regular thirdpersoncharacter placed in the level

but autopossess does nothing

[dark edge]

Ya just check auto possess player 0

[oak pond]

and how would it work it out for multiple anyway

[dark edge]

It would be ass for multiple

[oak pond]

well then how are they all gonna possess the same one

[sinful tree]

Multiple players aren't supposed to possess the same pawn.

[oak pond]

yep

exactly

so how would you even set up one for each player to possess

[pallid gorge]

I am using this blueprint in PlayerCharacter to Save Character, but I would like to create a new blueprint for make FQuests and variables. Is it possible to do it?

[sinful tree]

If you want pre-placed actors in multiplayer for players to possess, then you'd likely need to somehow get an array of all the actors that players could potentially possess in your game mode. You'd need some way of sorting said array if so desired, and then as players join the game you could use OnPostLogin to retrieve the actor in the array at index 0 and possess it using the "New Player" pin from the OnPostLogin event. Once possessed, you remove index 0 from the array, eventually using up all the available actors.

[oak pond]

doing something similar rn with actors that are basically like playerstarts, but have the variables the players need too. then it just sets them and teleports to one

doesnt seem like the most reliable solution though

but it does work

[forest fulcrum]

hey, can u give me a hand with an issue??

[slim mist]

Hi all, I'm multicasting the broadcast of a delegate, but the client that is bound to it is not having their callback function called. Does anyone see what I am doing wrong?

APawn* ClientOwnedPawn;
AUnownedDoor* ServerOwnedDoor;

void APawn::OpenDoor(AUnownedDoor* Door /* Door is not owned by player */)
{
    Door->DoorOpenDelegate.AddDynamic(this, &APawn::OnDoorOpen); // this does not fire on the client
    Door->Server_Open();
}

void APawn::OnDoorOpen()
{
    // This does not fire on the client
}

void APawn::Server_OpenDoor_Implementation(AUnownedDoor* Door)
{
    Door->Open();
}

void AUnownedDoor::Open()
{
    if (!IsServer())
    {
        Server_Open();
    }
    else
    {
        Multicast_Open();
    }
}

// UFUNCTION(Server, Reliable)
void AUnownedDoor::Server_Open_Implementation()
{
    Multicast_Open();
}

// UFUNCTION(NetMulticast, Reliable)
void AUnownedDoor::Multicast_Open_Implementation()
{
    DoorOpenDelegate.Broadcast(); // The callback above (APawn::OnDoorOpen) does not get called on the client
}

[chrome onyx]

Any chance you don't have the replicate bool checked?

[slim mist]

it is checked :3

[chrome onyx]

I think you need to also add the delegate to the event's list:
OnBuffCompleted.BindDynamic(this, &UBlahBuffableComponent::OnOwnedBuffCompleted);
NewBuff->ServerOnBuffCompleted.AddUnique(OnBuffCompleted);

[slim mist]

Sorry, I'm having trouble understanding. Could you amend it to reflect the above example?

[pallid gorge]

anyone ?

[chrome onyx]

Yeah I usually do them like I posted above, so you'd (on your pawn) have a delegate, something like:
FOnDoorOpened::FDelegate OnDoorOpened;

Then you'd bind the function you want to that event so:
OnDoorOpened.BindDynamic(this, &APawn::OnDoorOpen);

Then you'd register that delegate with the dispatcher on the door:
Door->DoorOpenDelegate.AddUnique(OnDoorOpened);

worth also seeing if it's a problem of:

1. Pawn event not hooked up to delegate correctly OR
2. Multicast not reaching the client correctly

could be either

[slim mist]

What would be a quick way for me to discern if it is #2 or not?

Like seeing up a UE_LOG in the multicast function to see if it reaches the client?

[chrome onyx]

breakpoint or log or whatever yeah

if you only get one log per instance that's the server only

[slim mist]

Will breakpoints work on the 2nd PIE session?

[chrome onyx]

yep

It can sometimes be a bit annoying to find out if you're on client or server, but "RemoteRole" on actor is usually a decent way

[slim mist]

Is there a way to easily tell if the breakpoint is referring to the first or second PIE session?

[chrome onyx]

and in this case # of calls will inform

yeah breakpoint -> RemoteRole IMO is probably the easiest. Print string in BP is nice cause it dumps whether it's client or server 😄

[slim mist]

Oh...one more complication...in the actual situation I am debugging, ADoor is actually UActorComponent

[chrome onyx]

yeah shouldn't matter, EXCEPT that you'll have to also check the "component replicates" bool on that component

Although if it's an actorcomponent it shouldn't start with an A 😮

[slim mist]

yep, my example didnt reflect real life

[slim mist]

nice, it is checked

[ocean geyser]

any idea if you can easily force a variable to replicate to clients even if it hasnt changed?

[slim mist]

Okay, this more accurately represents the execution flow:

APawn::Interact(UButton* Button) // owned by client
{
    if (!IsServer())
    {
        Server_Interact(Button);
    }

    Button->Activate();
}

APawn::Server_Interact_Implementation()
{
    Interact(Button);
}

class UButton : public UActorComponent // owned by server
{
public:
    FOnInteractDelegate OnActivate;

    void Activate() { OnActivate.Broadcast(); }
}

class UTerminalState : public UActorComponent // owned by server
{
public:
    FOnPowerSwitchDelegate OnPowerChanged;

    void TogglePower()
    {
        IsServer ? Multicast_TogglePower() : Server_TogglePower();
    }

    UFUNCTION(Server, Reliable)
    void Server_TogglePower();
    void Server_TogglePower_Implementation() { Multicast_TogglePower(); };

    UFUNCTION(NetMulticast, Reliable)
    void Multicast_TogglePower();
    void Multicast_TogglePower_Implementation();
    {
        bPower = !bPower;
        OnPowerChanged.Broadcast(bPower);
    } 

private:
    bool bPower = false;
}

class ATerminal : public AActor 
{
public:
    UButton* Button;
    UTerminalState* Terminal;

    virtual void BeginPlay()
    {
        Button.OnActivate.AddDynamic(this, &ATerminal::OnButtonActivated);
        Terminal.OnPowerChanged.AddDynamic(this, &ATerminal::OnPowerChange);
    }

    void OnButtonActivated()
    {
        Terminal->TogglePower();
    }

    void OnPowerChanged(bool bPowered)
    {
        // this is not being called on client
    }
}

[chrome onyx]

multicast is a surefire way (won't hit onrep, but you can have onrep and the multicast call the same function)

[ocean geyser]

trying to avoid reliable multicasts and its something that i need to be reliable. i would of assumed there would be a simple way but i have yet to find it lol

[chrome onyx]

eh, unless you're sending a ton of data, reliable multicasts are fine. Tbh variable replication itself is pretty costly on the CPU

[slim mist]

wait I have to make one more change to my example, I f'ed up

[ocean geyser]

push model ftw hehe. just wish when i marked something as dirty it would replicate instead of checking to see if its changed first -_-

[chrome onyx]

you might want to check if you have any errors in your logs, I think you might be hitting some nulls on trying to call a client->server function with an actor component as a reference

I

AFAIK normally you can't pass components across the network

like you might want to make an interface on your button actor or something, or have the interact go to server with the actor (and then on the server, get the component)

[chrome onyx]

yeah if you're using Iris I have no idea lol

[slim mist]

thank you!

just updated UTerminalState to accurately reflect the flow in my program

[ocean geyser]

not yet. havent tinkered with iris yet, not 100% sure what all it entails lol

[slim mist]

this is what presently happens

[chrome onyx]

Right here though it seems like you're trying to send a UButton (which is a component) across the network in Server_Interact

APawn::Interact(UButton* Button) // owned by client
{
if (!IsServer())
{
Server_Interact(Button);
}

Button->Activate();

}

APawn::Server_Interact_Implementation()
{
Interact(Button);
}

[slim mist]

ooooo

What would be an alternate way to make it work?

[chrome onyx]

Like I would do:
APawn::Interact(AActor* Interactable)
{
if (!IsServer())
{
Server_Interact(Interactable);
}
}

APawn::Server_Interact_Implementation(AActor* Interactable)
{
UButton* Button = Interactable ? Interactable->GetComponentByClass<UButton>();
if (!Button)
{
return;
}
Interact(Button);
}

Bonus points if you have an interface or something to allow interaction with different kinds of things instead of directly casting

[slim mist]

yep, this is what I do

[chrome onyx]

but yeah passing target across the network as "actor" is always safer

[slim mist]

Server_Interact(Interactable) I might be misunderstanding, but isn't this sending an actor across the network? Does that work but sending a component doesnt?

This is the actual function being called from the APawn's component that deals with interaction:

void UVrCoreHandManager::HandlePrimaryButton(UGripMotionControllerComponent* MotionController, bool bPressed)
{
    if (!IsServer())
    {
        Server_HandlePrimaryButton(MotionController, bPressed); // this just calls HandlePrimaryButton
    }

    // Handle Animation

    // Send input to gripped objects
    TArray<UObject*> GrippedObjects;
    MotionController->GetGrippedObjects(GrippedObjects);
    for (UObject* GrippedObject : GrippedObjects)
    {
        // Check if the gripped object implements IVrCoreInteractableInterface
        IVrCoreInteractableInterface* InteractableInterface = Cast<IVrCoreInteractableInterface>(GrippedObject);
        if (InteractableInterface)
        {
            InteractableInterface->Execute_SendPrimaryButton(GrippedObject, bPressed);
        } else
        {
            // Check if the owning actor is implementing IVrCoreInteractableInterface
            AActor* Actor = Cast<AActor>(GrippedObject);
            if (!Actor)
            {
                if (const UActorComponent* Component = Cast<UActorComponent>(GrippedObject))
                {
                    Actor = Component->GetOwner();
                }
            }
            if (!Actor)
            {
                continue;
            }
            
            InteractableInterface = Cast<IVrCoreInteractableInterface>(Actor);
            if (InteractableInterface)
            {
                InteractableInterface->Execute_SendPrimaryButton(Actor, bPressed);
            }
        }
    }
}

inline bool IsServer() const
{
    return GetOwner()->HasAuthority();
}

[chrome onyx]

For an object to be able to be passed across the network as an RPC parameter, there are a number of things that need to be true for that not to be null

Replicated actors are always able to be passed, as are structs/basic types of course

but it gets hairy when you get to things that are just children of UObjects

but you don't have to take my word for it, you can see if the button is arriving safely on the other end of the server call or not

[slim mist]

UGripMotionControllerComponent* MotionController has bComponentReplicates == true

[chrome onyx]

like just check if Server_Interact_Implementation has a valid button when you go from client -> server

yeah but components replicate through their owner's actor channel, so it's a bit different

ie you can replicate vars and RPCs but the actual object isn't quite the same way

[slim mist]

alright when the client hits the button it works for the listen server, but the client doesnt see it

[chrome onyx]

if you happened to copy my code it doesn't have the Activate on APawn::Interact(AActor* Interactable) cause I was lazy

[slim mist]

I very much appreciate your help @chrome onyx

[chrome onyx]

haha yeah you got it, bud!

[slim mist]

my guess currently is that the issue lay within UVrHandManager

because the buttons activate delegate isnt being fired on the client

although I'm a little puzzled, I would think that wouldnt even matter if what I'm really looking for is ATerminal::OnPowerChanged to be called, and the UTerminalState::OnPowerChanged delegate bering broadcasted from a mutlicast function on the server

seeing that when the client interacts with the button and the listenserver sees it...it is properly being sent to the server

but its just not making its way back to the client

[chrome onyx]

yeah like it really depends how you're planning to get that stuff to the client again

Typically it's like:
Client (Request) -> Server (Do action) -> Multicast

OR

Client (Request, Do action Locally) -> Server (Do Action) -> Multicast (Skip requesting client)

First one's easier, second one is more responsive

Like normally for a door, I'd just do client hits button, sends request, server sets a replicated bool, with an onrep that causes it to open/close

[slim mist]

wish I could use onrep more but I'm dealing with huge structs that contain tmaps

I have a centralized data store similar to redux

with lots of observers

[chrome onyx]

yeah I usually just bite the bullet and use Tarray for anything that needs to rep

cause otherwise it becomes a nightmare

sometimes I'll recreate the map on onrep or whatever

but yeah ue doesn't want to replicate maps thats for sure

[slim mist]

USTRUCT(BlueprintType)
struct ROYALDIVISION_API FBeagleState
{
    GENERATED_BODY()

    UPROPERTY(BlueprintReadWrite)
    FFeetState FeetState;

    UPROPERTY(BlueprintReadWrite)
    FEngineState EngineState;
    
    UPROPERTY(BlueprintReadWrite)
    FApuState ApuState;

    UPROPERTY(BlueprintReadWrite)
    FElectricalState ElectricalState;

    UPROPERTY(BlueprintReadWrite)
    FWeaponState WeaponState;

    UPROPERTY(BlueprintReadWrite)
    FTgpState TgpState;

    UPROPERTY(BlueprintReadWrite)
    FSensorState SensorState;

    UPROPERTY(BlueprintReadOnly)
    FActorState ActorState;

    UPROPERTY(BlueprintReadOnly)
    FMfdState MfdState;

    UPROPERTY(BlueprintReadOnly)
    FControlsState ControlsState;

    UPROPERTY(BlueprintReadWrite)
    FChairState ChairState;
};

with each of those state properties having many...many properties

[chrome onyx]

yeah I mean I guess it depends how many of those have to be server auth/etc

[slim mist]

for some reason the light replicates when the battery switch is flicked but the MFD panel doesnt show the right values 🙂

[chrome onyx]

but yeah if they could all change on server at runtime and have to be communicated that's trouble haha

[pallid gorge]

Why it does show the widget, but it doesn't change the boolean variable to true?

[sinful tree]

GetPlayerController/GetPlayerCharacter/ Any of those "Gets" are usually not good to use in multiplayer. When executing in the character, try using Get Controller and casting that instead.

Otherwise, the boolean should be getting set within the playercontroller.

[meager spade]

They really need to put s bit notice on these stupid functions

Big

People use then not knowing what they mean or the purpose of them

[pallid gorge]

yeah it's true

i actually don't know anything about ue

still learning 🙂

[meager spade]

Just right click type get controller

[pallid gorge]

why

[meager spade]

?

In your event graph

Right click type get controller ..

[pallid gorge]

nono

[meager spade]

And delete that get player controller node

[icy jetty]

Ohhhhh, so that’s how you get around the forced player index

[meager spade]

Player index is for split screen stuff

And use context matters

[sinful tree]

Controller has a reference to its playerstate and its controlled pawn. Pawn has a reference to its playerstate and controller. Playerstate has a reference to its pawn (Pawn Private) and its owner is Controller.

[icy jetty]

Yeah, I’d read that you need to get it from player state for multiplayer but I didn’t realize you just need get controller

[meager spade]

I have never used those GetCrap nodes in any project

[icy jetty]

Right, I saw someone say it’s always index 0 unless it’s split screen, but I thought maybe that was wrong given that everyone said not to use get player controller in multiplayer

[meager spade]

0 is first controller in list

[icy jetty]

I guess it’s just not doing the same thing the get controller is

[sinful tree]

FORCEINLINE AController* APawn::GetController() const
{
    return Controller;
}

[meager spade]

Index is the first controller in the list of conteollera

[sinful tree]

class APlayerController* UGameplayStatics::GetPlayerController(const UObject* WorldContextObject, int32 PlayerIndex) 
{

    UWorld* World = GEngine->GetWorldFromContextObject(WorldContextObject, EGetWorldErrorMode::LogAndReturnNull);

    if (!World)
    {
        return nullptr;
    }

    // Don't use the game instance if the passed in world isn't the primary active world
    UGameInstance* GameInstance = World->GetGameInstance();
    const bool bUseGameInstance = GameInstance && GameInstance->GetWorld() == World;

    int32 Index = 0;
    if (bUseGameInstance)
    {        
        const TArray<ULocalPlayer*>& LocalPlayers = GameInstance->GetLocalPlayers();
        for (ULocalPlayer* LocalPlayer : LocalPlayers)
        {
            // Only count local players with an actual PC as part of the indexing
            if (APlayerController* PC = LocalPlayer->PlayerController)
            {
                if (Index == PlayerIndex)
                {
                    return PC;
                }
                Index++;
            }
        }
    }
// Truncated....

[meager spade]

Which I'd sat 0 fir clients but a server will have say 8 controllers

[icy jetty]

Oh ok so it would be different for the server, it’s always 0 for the client tho, right?

[meager spade]

If you used controller 0 on server your always changing the first controller which might suck for players 2 to 8

[icy jetty]

I can see how those are vastly different 😅

[meager spade]

Those nodes shod be used if you need to use then and understand them

[pallid gorge]

I am using Get Controller, same issue. Widget show, but it doesn't change boolean

[meager spade]

Single player games sure know your socks off with them

Knock

[sinful tree]

It's changing, I can guarantee it. There would be no reason why a boolean wouldn't be getting set. It's probably not being set where you particularly want it to or you're not reading it correctly.

[meager spade]

Or its not replicated

[icy jetty]

Yeah, that seems to be the case with everything in the engine (need to know how it actually works), lots of things get misused because they appear to do be the right solution but aren’t necessarily it

[meager spade]

Oh it's a client rpc

Either way likely reading it from the wrong place

[sinful tree]

Seeing as you were mentioning saves before, and you're working in multiplayer, it could be that you're setting the value on the client, but then trying to read the value on the server, in which case, you're changing the value on the client so that doesn't happen.

But again, it is getting set, it's more a matter of where are you reading it where it's not correct?

[icy jetty]

So if you don’t use any of these “gets”, what do you use then? ^^…

[sinful tree]

I just told ya 😛
Controller has a reference to its playerstate and its controlled pawn. Pawn has a reference to its playerstate and controller. Playerstate has a reference to its pawn (Pawn Private) and its owner is Controller.
These classes are the primary ways in which a player would be interacting with the game, or in which anything would be referencing a specific player. From any of these, you can get any of the others as needed (with exception to controllers in online multiplayer of course)

[pallid gorge]

At the end I fixed like this

idk

[icy jetty]

Right, yeah, I was just confused by Kaos’ GetCrap nodes comment, I thought he’s talking about all nodes that start with get 😅

[pallid gorge]

i dont even care sdince its working

probsably it's bad but it's owrking

[icy jetty]

You will likely encounter further issues with that

[pallid gorge]

probably

but for now it's working ahahahah

[random heath]

So, I am making an endless runner game in integration with Playfab and Xsolla:
1.I am integrating playfab for Leaderboard and Authentication services.
2.I am also using Playfab Economy and created virtual currency on it.
3.I am using Xsolla store and payment gateway to purchase virtual items using real currency and virtual currency.

Issue:
1:While trying to import catalog of playfab in Xsolla, I am getting this error attached below. Any assistance would be helpful.

[arctic minnow]

Is this replicated right 🙂

🙂 🙂

[icy jetty]

Did you try contacting them via the email in your screenshot?

[random heath]

i contacted Xsolla not playfab they are looking into it already

[icy jetty]

Where is the actual implementation of those events you are calling?

[random heath]

in blueprints

[icy jetty]

I was replying to someone else there

[random heath]

aah mb

[arctic minnow]

🙂 🙂

🙂 🙂

[icy jetty]

If you’ve contacted them, then that’s your venue. It looks like an Xsolla issue so, no one here could prly help @random heath

[icy jetty]

Ok, so which part of the code are you trying to replicate? So far I just see calls to other events

[arctic minnow]

Just wasent sure if the add movement input is replcated Because when I host my game in listen servers it really like weird its like gravity if fightning me or something

🙂 🙂

🙂 🙂

[sinful tree]

Don't make axis inputs RPC to the server reliable. You're asking for a bad time doing that. It doesn't need to be reliable as you're sending them every frame and you don't care if some frames are missed.

[arctic minnow]

I think every custom event in my game is reliable lol

Witch ones should be?

🙂 🙂

[sinful tree]

Only ones that must be executed for gameplay purposes and would otherwise "feel bad" if players didn't get responsiveness from. Inputs usually you want reliable, but not when you're sending the inputs every frame.

Multicasts if used correctly almost never need to be reliable - they are usually reserved for visual/audio effects.

[sinful tree]

Further more, if you're using "Add Movement Input" that's an indication you're using the character movement component and you shouldn't need to send the axis at all to the server, nor set the value on clients.

[arctic minnow]

O Ok I see its just weird when I play my game it feels like gravity is fighting me?

[sinful tree]

That's likely something else. Make sure you plug in your axis value into the add movement input rather than setting the axis value and using that for your move forward.

[eager flare]

Is there any good tutorials that shows you how to setup a basic multiplayer fps with dedicated servers?

[dark edge]

Good? Probably not

If you're talking about just launching a server, that's trivial. Just launch it.

If you're talking about orchestrating a whole automatic-scaling backend, if you have to ask, don't do that. You'll just generate a $100,000 AWS bill.

So Garrysmod style servers, trivial.

Fortnite servers, hard.

[eager flare]

wbt valorant servers? /csgo

[faint eagle]

Is it possible to establish client-listen server connection between 2 editors running the same project on 2 different PCs in the same local network? I've done it before with online subsystems and on packaged builds but now I need to do it on editor level so I'm wondering if that's even possible 🤔

[dark edge]

At editor time or play in editor?

[faint eagle]

play in editor

[dark edge]

Sure just connect

[forest fulcrum]

hey i was trying to posses in multiplayer a Pawn(skateboard) but it seems that in client doesnt work

[rocky kestrel]

How to update that current players amount? I have dedicated server game.

Or is there other way to do it? Can't find anything on Google

[halcyon totem]

I am having issues on my dedicated server , when my map restarts its over riding the code of where I want my pawns to spawn, instead spawning them in random player starts

anyone ever expirence this on map restarts?

[halcyon totem]

do we need to override anything?

with choose player start?

[dark edge]

Just update it.

Is ServerInfo a struct you added to something?

[oak pond]

how do I even replicate something that isnt an actual player

like for example just a physics object, if I wanted that to use physics server side then dont use physics but just set its location on the clients

[untold rose]

How would I go about getting where a player is looking from the server?

[oak pond]

just wherever you set the rotation variable replicate only that

set his angle on client, then after that send it to the fake players

[dark edge]

There's physics replication already

It runs physics everywhere but gently corrects it towards the server side version

[oak pond]

huh

unreal 5?

[dark edge]

4 and 5

[oak pond]

what, all I hear is physics cant be truely done

[dark edge]

Well you hear wrong

What can't really be done is predicted physics

If you're ok with ping lag between a clients inputs and the physics result then it works beautifully

[oak pond]

how does this work then, because by default objects will just immediately desync because of simulating on each player

[dark edge]

There's a replication handler which corrects them

[oak pond]

how do you set this up though?

[untold rose]

I just use the 'add controller pitch input' node so there isn't a variable I set. I've tried getting the control rotation from the player controller and setting it in a var that's replicated but it only seems to return 0,0,0

[dark edge]

There's nothing to set up. Just make sure the actor replicates, replicates movement, and that should be enough. By default I think the replicate physics option is checked for the component that's simulating

[oak pond]

oh you mean that, if I remember rightly control rotation is able to replicate automatically? so maybe its the way youre inputting it Im not sure

[dark edge]

There's tuning settings in project settings

[oak pond]

ah yeah, seems to be working, even if a little flashy looking, but if one player shoots one it only moves on his end. I havent replicated the shooting yet but shouldnt it still be doing something?

[dark edge]

Yes the forces and impulses need to be serverside

[untold rose]

I think i've got it, just need to get the instigator controller and cast to the player controller and get it that way.

[oak pond]

ok nvm it immediately desynced in the next playtest

[dark edge]

Make a target actor, give it a:

Begin play -> delay -> has authority -> random impulse

Tune your setup until server and client agree

Then start tuning it for smoothness. Stock settings are super strict

[oak pond]

Ive been spawning it on a slope right now and letting it fall off

[dark edge]

You should see corrections on client with the impulse, that's one way to test it.

[oak pond]

but its not even falling the same way in the first place

jeez I just made a new actor thats just a cube for testing this and its even WORSE

on one client it just freaks out and disappears from the map immediately

what

first frame of the playtest on both players

can I not just fake it already

all I wanna do is just send across the location and rotation. I dont want to simulate physics for each player. Ive already done a similar thing in the player script but in this case I dont know where to get the location and rotation from in the first place. if it doesnt simulate on each player then where? where does it COME from

[chrome bay]

Unless the object it moving on the Server, it won't send an update to that client. A client can desync themselves permanently if they're moving the object locally and the server isn't sending movement updates to them.

[oak pond]

exactly, so Im trying to run the physics on the server only

but now the multicast event wont do anything

even the damn print string isnt going through to the client

as if I suddenly cant do a basic event

[icy jetty]

Ah, multicast the apparent solution to everything

[chrome bay]

You don't neccesarily want to run physics server only, that'll just create input latency and give very jittery/snappy movement on clients. Clients should simulate so that updates between packets are smooth and objects are simulating properly.

Are clients controlling these physics objects? If so, make them pawns and possess them, uncheck "replicate physics to autonomous proxy" on the root component, then spam the server with an unreliable RPC about the current physics state of the object. That'll be basic client-auth physics.

[oak pond]

theyre not being controlled, I set it up so that it only simulates physics on the server, that works, and then even the multicast after that returns the location in a print string but does nothing

[chrome bay]

It works in editor, but it won't work well in the "real" world

multiplayer do be like that

[oak pond]

I know but in this case Im not actually doing a whole lot

literally just a regular server to multicast event

[vivid dagger]

Is it alright to use something like playfab as a database but then use dedicated servers from another source? Does everyone else just make their own databases?

[chrome bay]

If clients aren't controlling the object, then litteraly all you need to do is check "replicate movement" on the actor. That's it

[oak pond]

already did basically the same thing on the player except they use their own locations

no look I just did that

[oak pond]

[chrome bay]

Clients WILL still simulate physics, whether it's simulating or not is determined BY movement replication.

[oak pond]

theres no way Im trusting separate simulations

[chrome bay]

But they will diverge

The only answer then is don't use physics, use a deterministic sim

It doesn't matter what you're doing, even if it's just one object, in the real world it won't work

[vivid dagger]

guys you are burying me it took me like 10 minutes to type that

[oak pond]

we were already talking tbf

this happens all the time

[chrome bay]

You won't get a steady stream of transform updates at 60hz outside the editor/LAN

[oak pond]

so I suppose not even the one that currently works on the player will either

[chrome bay]

Physics networking is literally one of the hardest things to solve in MP btw, not to disuade you

[oak pond]

it doesnt have to be perfect just not completely broken

yeah I know, which is why Im tring to AVOID simulating regularly on both

[chrome bay]

You can't without going into C++ anyway

Well, assuming you're using replicated movement

Which is the only sane way

[oak pond]

I just want to fake the position

[chrome bay]

Well, I guess you can turn off replicated movement and spam the position with an unreliable net multicast every tick

Not gonna scale

But memes/it'll work

ofc none of the physics replication stuff mentioned earlier has any effect in that case

[oak pond]

well this is pointless then

Ill have to make sure not to use any physics at all in any multiplayer maps

...in my physics based game

[vivid dagger]

then don't mind me making my entrance once again: Is it alright to use something like playfab as a database but then use dedicated servers from another source? Does everyone else just make their own databases?

[chrome bay]

I mean pretty much 😄

I've done a lot of network physics stuff, the only sane way really is to simulate everywhere

[oak pond]

yeah I mean as Ive said Ive always known to avoid physics in multiplayer but I dont see why it shouldnt at least do SOMETHING when I try to fake it

because its literally what I did on the player so that you can play without problems

at the very least Id be happy with individual non colliding objects

projectile movement is looking like the best chance

[chrome bay]

Well, projectile movement believe it or not also simulates independently on every connection.

And it really has the same deal in that if a client moves the projectile locally and the server isn't moving it, the client will desync permanently.

It's just more prominent with physics because things are much more likely to move "on their own"

[oak pond]

what I thought projectile movement was fine for replicating

[chrome bay]

It is, but it's the same deal

[oak pond]

well that goes for everything doesnt it? thats just regular desync that anything not replicated would do

[chrome bay]

Even characters can permanently desync, there's nothing preventing it from happening. If an object isn't moving server side, the server isn't going to send out updates for clients to apply.

But if replicated movement on two physics cubes isn't working, then something else is going wrong in your setup.

[oak pond]

its literally just

[chrome bay]

Does the client "own" the cube?

If not, they can't call that server RPC

[oak pond]

I dont even know anymore

[chrome bay]

I thought the clients didn't control the cubes?

[oak pond]

but I can see that I simulated it on just the server

[chrome bay]

I mean that setup is inherently broken. Whoever owns the cube is telling the server it's transform, server is then applying it, and telling all clients to do the same, so there's a loop there.

If no clients own the cubes, then that tick RPC is doing nothing

And all clients are trying to set the positions of all cubes, while also being told what the position is

[oak pond]

yeah Ive been asking about this in the first place actually

[chrome bay]

So they will just get stuck

[oak pond]

because I dont know how to just go from the server to the clients

no one owns this cube its just IN the map

[chrome bay]

Okay, in which case remove that tick function

Delete the mutlicast. And just check "replicate movement"

Fin.

[oak pond]

oh my god

[chrome bay]

Basically, delete all that, and check "replicate movement"

problem solved

[oak pond]

yeah thats what I did

ah yes, immediate desync

[chrome bay]

Also, some other sanity things to check:

• Cube must be the root component
• Cube must be replicated

<@&213101288538374145> despatch pls

[oak pond]

still can be immediately desynced by just pushing it

[chrome bay]

You are using the default character implementation presumably?

[oak pond]

no thats why I had to use the same location faking method on the players

[chrome bay]

Okay in which case I can't tell you why it won't work

Cus I have no idea if the character logic is sound either

[oak pond]

most definitely not

but it does work if not influenced by anything else

no one mentioned root component before, I had a feeling about that but Ive never had to do that

and its not too convenient for some of my other things

[chrome bay]

the actors root component is it's transform, so it has to be the root object if you want replicated movement/physics

[oak pond]

well thanks for the help, maybe I can do something with this. is there any way at all to correct desyncs though? or is it best to just try to avoid anything else influencing the movement

[wanton bear]

hey all, i'm trying to figure out why a scene component attached to a camera on my character has the wrong roll rotation. Before i've done anything to it, it seems that the world roll rotation is 90 degrees off for everyone except the owning client...

translation and other rotation values are correct, im struggling

the translation is replicated if its in a character... i see the replication symbol when i drag out

[chrome bay]

Well, if the client moves an object and the server doesn't know - there's no really anything the Server can do. The alternative is sending movement transforms for every object all the time, but it's obviously very wasteful and doesn't scale well. Generally you just need to keep the overall game state in sync and things should be mostly smooth

[wanton bear]

oh interesting. if i subtract 90 degrees from the camera roll then it fixes it and the values line up

hacky solution because i need the rotation that was on the owning client for the rest of the logic

i guess just rotate the scene component lol.

[rain condor]

Yo! I have a drag and drop inventory and i wanna replicate drop items

Because pickup items it's replicated

[sinful tree]

When you "drop" the item, you need to make an RPC to the server through a replicated and owned actor/component. So if you have an inventory component that your inventory is stored in, that may be the place where you want to put that RPC. So then in your OnDrop function in your widget, you can call that RPC in your inventory component and do what you want to do when an item is dropped.

[rain condor]

What means rpc?

[sinful tree]

https://www.youtube.com/watch?v=JOJP0CvpB8w

[dusky yarrow]

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

[ocean geyser]

is there anyway with replicating UObjects to have the UObject's properties utilize replication conditions such as COND_InitialOnly? or even push based. currently no replication condition makes any difference, even if the property is set to be pushed based it still checks and replicates all the time even when not marked dirty (only difference was the OnRep never fired oddly enough). same goes with all COND_InitialOnly properties

[whole pine]

how do you make linetracing recognize you are clicking on a different client player

[icy jetty]

Islocallycontrolled node might do the trick

[whole pine]

how do clients work? do they get a number or something?

im eventually trying to pull theplayfab name out of which client i click

[icy jetty]

That’s a loaded question

[whole pine]

lol

i guess i mean how do i get the specific clicked clients info

[icy jetty]

Prly by accessing the referenced pawn’s player state, but someone else here can prly give you the correct answer

[whole pine]

can you explain to me what kind of stuff should be going into player state or no

is player state even relevant if im using playfba to handle player info

[icy jetty]

Idk anything about playfab. See Datura’s msg here #multiplayer message

There’s also loads of resources pinned

[whole pine]

alright

any idea why this isnt working?

@icy jetty

[icy jetty]

Well I thought you said you want to check if the hit actor is a diff client

You’re asking if the current actor is locally controlled, and then running it on the false, so that’ll prly never work

[whole pine]

ya im just seeing if i can open my other player's inventory first

[icy jetty]

Drag off the out hit of the line trace, break hit result

Grab the out hit hit actor and run the check on that

[whole pine]

what am i getting from hit actor? the capsule?

[icy jetty]

The pawn

You want to go up the hierarchy not down

[whole pine]

no get player pawn option

[icy jetty]

Getowner

[unkempt tiger]

When a server calls a UFUNCTION(Client, Reliable), does the server also run that function?

Or should I be calling the _implementation myself?

[icy jetty]

Client means run on client no?

[unkempt tiger]

it does, but i thought the server also entered the scope for some reason? and i feel like i've gaslit myself now

[whole pine]

so i got the correct widget to show up but if im just trying to click another client do i check if the pawn is locally controlled for the location inputs? cause its just opening the widget regardless of where i click on the screen

[icy jetty]

Show code

[icy jetty]

Ok alot of that seems wrong, idk why you’re getting owner and trying to run code when the value is nullptr. And you don’t have start and end vectors plugged into your line trace

[whole pine]

im seeing if its clicking owner char or another char

idk what to even put for location tbh this is my first day line tracing lol

[icy jetty]

That’s not what isValid does

It checks if the incoming reference is a valid object or None (nullptr)

[whole pine]

well i couldnt plugthe get owner into a branch

[icy jetty]

I told you to check if it is locally controlled

[whole pine]

get owner doesnt go into locally controlled tho

[icy jetty]

Nvr said to get owner

[whole pine]

?

[icy jetty]

Lol I’m losing my mind sry too many chats

[icy jetty]

Yes

Except not self

Can you not plug in the hit actor into it?

[whole pine]

i cannot. so for location inputs though.... what even goes into that if im clicking another client

[sinful tree]

Hit Actor is an "Actor" reference, you need to cast it to "Pawn" to check if it is locally controlled.

[icy jetty]

Oh cast

Duh

[ivory bear]

In the below image, the Weapon_BP and Weapon_BP_3P are ChildActors that use a ParentSocket and ChildActorClass set to a Weapon blueprint of choice that has a first person field of view material (for ADS and object clipping) and ADS offset values. How can I hide Weapon_BP_3P from the first person camera/player and hide Weapon_BP from other players.

[whole pine]

does this make sense to you, and what goes into the location inputs?

[sinful tree]

You're definining the locations of where in the world you want your trace to start and end.

[whole pine]

its a topdown game tho, so i have no idea. do i use the camera actor or something

[sinful tree]

If you have no idea, how would anyone else?
Think carefully about what you're trying to accomplish with the line trace. What do you want to trace from and to?

[whole pine]

my cursor to a character

[icy jetty]

You can use the show trace options to actually see what you’re tracing at btw

[whole pine]

tru

[sinful tree]

You may not even require a trace for that. There's usually an "ActorOnClicked" event you could potentially utilize. Only trouble is, is that you've got to implement this on any actors you want to click.

[whole pine]

thats useful

let me give it a whirl

[sinful tree]

Technically speaking, your mouse doesn't really exist in the game world unless you've made some fancy 3D mouse that does. But you can do traces from the mouse using this node.

[whole pine]

actor on clicked didnt work

just opens the owning player's inventory widget instead of the otherplayers inventory widget

[sinful tree]

That's because you're getting the local player.

[whole pine]

ya but its comin off the false exec

[sinful tree]

No i mean, you're using "Get Player Pawn 0" which almost always returns the local player's pawn. So of course it is going to be locally controlled.

[whole pine]

i see

[sinful tree]

"On Actor Clicked" is something you implement in actors you want to be clicked on.

[whole pine]

so i should stickto the line tracing?

[sinful tree]

Well, you could just try removing the cast, checking if self is locally controlled.

[whole pine]

ah ok

[whole pine]

worked but its opening the owning widget as well as the other widget now

im tryin to think of how i could prevent the owning player inventory from opening if i click the other player

i guess just set a is locally controlled where i open the owning player inventory lol

thanks for the help

[quartz iris]

Guys

Is there a download for the UE 5.2 AdvancedSessionsPlugin/AdvancedSteamSessionsPlugin?

[slim mist]

Hey there, hope everyone is having a not-too-shitty Friday 🙂 I have an NPC trying to invoke its own Server_ RPC, however I am getting this error:

No owning connection for actor BP_MyCoolNPC_C_0. Function Server_SetMfdPage will not be processed.

What is going on here?

[graceful flame]

I installed it today and it works. It's on GitHub here --> https://github.com/mordentral/AdvancedSessionsPlugin

[quartz iris]

It works on 5.2?

[sinful tree]

Yes

[graceful flame]

I'm using 5.2.0 yes, have not tested it on the latest release 5.2.1 though.

[sinful tree]

You can only send RPCs to the server through client owned actors, like Player Controller, their controlled character, or their playerstate.

[graceful flame]

It was recently updated I remember it wasn't working on 5.2 just a few weeks ago.

[quartz iris]

Nice, so I don't have to update anything

It does say to rebuild/compile everytime I launch ue5.2 tho

[sinful tree]

There's usually flags for Owner No See and Only Owner See.

[ocean geyser]

can someone explain the difference here for BP_Chest's Count and the total amount of replicated properties count? i would of assume that the property count and count of BP_Chest should be pretty much the same no?

[ivory bear]

ChildActore doesnt have any "see" parameters.

[sinful tree]

You'd have to do so in the child actor blueprint for any meshes in it. Also not sure if using a child actor automatically assigns ownership to the parent, but you'd need to make sure it does if it still isn't working.

[quartz iris]

I do get this error though

I cant launch UE5.2

[ocean geyser]

recompile

[ocean geyser]

in your IDE

[quartz iris]

Whats this?

[ocean geyser]

this is why i hate it when people strictly use blueprint
https://www.youtube.com/watch?v=AWVJcKk2r5s&ab_channel=SneakyKittyGameDev

[graceful flame]

My understanding is that Count is the number of times that BP was trying to replicate (netupdate frequency) but the count of properties is the number of times things actually were replicated, but I may be wrong on that. What I do know is that 99.60 waste is high which means you can probably reduce the update rate for that BP. However the more time between net update frequency the less responsive it will be for when you need it to replicate. But since the net update frequency can be adjusted at runtime you're free to apply whatever conditions you want to increase or reduce it. Maybe based on proximity to characters or something. There's also ForceNetUpdate which can be manually called at the end of an event so that it will replicate even if the net update frequency is waiting between updates.

[ocean geyser]

yep i actually just tested that and that seems to be correct. yea ik lol. right now im testing full blast because i was trying to figure out what the heck was going on since in my uobjects that use the actor for the outer i set them up to be push based and got very confused as to why it seemed it was not working as intended. i do have another question if you know. for example in my uobject i setup all the replicated properties to be pushed based and what i noticed was if i didnt mark the properties as dirty it would still replicate them but the OnReps would fire. i would of assumed if they were not marked as dirty then they would not even be checked or sent for replication but for some reason they are (push model is enabled in project)

[graceful flame]

I'm not too familiar with push model. I just RepNotify all the things. lol

[ocean geyser]

same, at this rate ill stick with it so maybe iris will have some clearer info lol, in the mean time dormancy will be the top dog for this lol. thank you

actually guess i can test that inside of an actual compoennt and see if its just a issue in the uobjects

[graceful flame]

oh yea I forgot about dormancy

That's like an on/off switch for replication