multiplayer

[smoky ore]

I am yes

[fluid flower]

and are you searching for dedicated servers, or player hosted sessions?

[smoky ore]

player hosted

[fluid flower]

ok and how do you create the sessions?

[smoky ore]

via this. (private games aren't in yet, I'm just trying to get public ones working and to be found)

and that is in a widget

in a previous project, i had the game instance create the session via an event in it, though I don't know if that makes a difference or not.

[fluid flower]

and I assume LAN = false?

[smoky ore]

yup

[fluid flower]

and you have a valid appid or using the test one etc?

player hosted sessions worked quite easily for us

[smoky ore]

I'm using the test one, 480 (spacewars), that being said, i decided to just for safety sakes turn the Creating Session thing from the widget to the Game Instance like how my old project handles it.

i dont see how this should effect it though (im gonna be shocked if it somehow does)

[main owl]

Am developing in VR and want to test replication but only have 1 headset, have been replication testing using my PC pawns but that way I can't test the VR Pawn, anyone else creating VR multiplayer content that has a good way to test replication with only 1 headset?

[desert glacier]

Hello,What is the way to open a level at the server but nothing happens to clients?

[twin juniper]

if you open a level, its unloading the other was open

the ideal is doesnt open levels at server if you dont want transitions

instead streaming sublevels

[gray scroll]

On character possessed... im calling this event: on server... owner is fine but on clients... owner is none. How do I replicate owner on client?

[twin juniper]

that self is which class?

[gray scroll]

character

[twin juniper]

probably that class isnt being replicated to client

[gray scroll]

and its replicated obv

[twin juniper]

so its a good question

🙂

[winged badger]

funny thing

    UPROPERTY(ReplicatedUsing=OnRep_Owner)
    AActor* Owner;

your Owner should be available client side by the time the Actor calls BeginPlay

[gray scroll]

@winged badger i fixed it...

called a set owner in that event

replicated to owning client

[winged badger]

😦 that's awkward

only works for owning client,

[twin juniper]

so owner isnt avaliable for construction script?

[winged badger]

construction script, no

[twin juniper]

ugly

[winged badger]

it runs on clients before the replication

[cyan temple]

anyone know why after creating a session (steam multiplayer) and joining it with a client the host spawns as the correct player pawn and the client spawns as spectator pawn even though the default pawn in the gamemode is the right one?

[gray scroll]

@winged badger so does my solution make sense? or something seems wrong?

[winged badger]

on server its
normal spawn -> set variables => spawns actor, runs construction script, calls beginplay, sets variables
deferred spawn -> set variables -> finish spawn => spawns actor, sets variables, runs construction script, calls beginplay
on client its always
spawns actor, runs construction script, sets replicated variables, calls replication callbacks, calls postnetinit, calls beginplay

the owner is replicated on AActor

it should be there on all clients, how are you checking it?

[gray scroll]

doing get owner inside weapon on beginplay

keep in mind....

i m calling it on possessed (character) which is called on server only

so maybe the owner doesnt get set for clients because all the logic is done on server only

[twin juniper]

the spawn actor should run only in the server, if it will be replicated

[gray scroll]

yea so for some reason its owner is none until i replicate it to owning client

the set owner

its weird

[twin juniper]

use the has autorithy before the spawn, see if it isnt being executed in the client too

theres a chance the client is spawning it too

[winged badger]

with ExposedOnSpawn pin

Owner has to be available on both server and client before BeginPlay

unless the K2_SpawnActor node is broken

you can easily test it, add an ExposedOnSpawn integer, or whatever, when spawning enter 47, and it will be 47 on server and clients on BeginPlay

[twin juniper]

replicated actors even with different names from server/client version still linked ?

[desert glacier]

even when I stream a level it's the same thing that reproduces

[winged badger]

replicated actors are identified with NetGUID, not the name

[desert glacier]

So what ?

what to do ?

[twin juniper]

what is happening to you ?

you open the level and the clients doesnt do nothing?

[desert glacier]

open a level at the server but not at the clients

[twin juniper]

the clients are really connected?

[desert glacier]

Yes

[twin juniper]

let me test here what happens

[desert glacier]

no, when I open a level by the server, there is also a level that opens with clients

[twin juniper]

from where you re calling the Open level?

[desert glacier]

after clicking a pause menu button

[twin juniper]

show how

[desert glacier]

What ?

[twin juniper]

you need that event being executed in server

if you calling directly from widget wont work

[desert glacier]

Yes only server

[twin juniper]

i tested here

it works fine

the clients travels to the new open level

[desert glacier]

No another

I want him not to travel

[twin juniper]

what you want?

[desert glacier]

Yes

So ?

What to do ?

[twin juniper]

i dont know what you need

[desert glacier]

I want to open a level at the server, but when I do it it also affects the clients, but I do not want that, I want that when I open a level at the server than at the clients, no level opens

[twin juniper]

thats not possible

[red pollen]

Why do you want that?

[twin juniper]

the connected clients will always got the level from the server

[winged badger]

if server goes somewhere solo, clients go to main menu

[twin juniper]

the persistent level must be the same from client

[desert glacier]

why when the server goes back to the main menu that the action does not happen in other players

[twin juniper]

but locally you can stream levels at clients

i guess

[winged badger]

because you don't have a main menu level or you didn't wait for their connections to time out

[twin juniper]

or because the level still open at the server,

the persistent current level is always open

you cannot run the engine without a level open

[desert glacier]

in fact I can just do it with a widget, but I have a system that displays the number of players in the session and I want that when a player returns to the menu that he is no longer considered in the session

[gritty lodge]

Does anyone know how to make a level streamed level load on a dedicated server (so that it gets the collision?) All my characters get loaded into a "base" level and then all the connected clients load the map to play on, which works as P2P, but once moving to dedicated server, the server doesn't know the collision so the characters just fall through the map on the first server update. Thanks.

[toxic flint]

so, i'm just about at the point now where I start buying multiplayer minimaps from the marketplace just to see how they do it...day two and i'm at the "flip random switches" stage of the development process...

I know! It's not a bug, it's a feature! Only one client gets a minimap, working as intended!!

my work is done here..Out the window the computer goes...

[winged badger]

i told you, there is no need to network a minimap in any way

it should work locally, unconcerned with network and replication

all the information you need is already available client side

[toxic flint]

Im not, I'm running all through the client side of Auth.. still only one client controls the minimap

[winged badger]

yeah, your character i assume is not a place to make widgets from

[toxic flint]

interesting

[winged badger]

that BeginPlay runs on clients for every Character

simulated or autonomous

funny thing is you actually probably have each client controlling its own minimap, its just that you have as many minimaps as you have characters

stacked ontop of one another

[toxic flint]

I had a is locally controll branch in there, that should have prevented that right?

[winged badger]

now, make a HUD derived class

and create the minimap widget from there

[toxic flint]

sorry, listening quitely now 😛

[winged badger]

HUD is created locally only, one per player controller

it helps avoid wires getting crossed with widgets, like the situation you have there

[toxic flint]

Ok, let me look into the Hud derived Class, thanks

[winged badger]

its designed to manage the widgets

it can reference player controller and controller pawn directly

with GetOwningPlayerController and GetOwningPlayerPawn

btw, IsLocallyControlled check would probably work, but using HUD is just good practice, especially for multiplayer

[narrow prairie]

i have on the game mode, post login a event inside player controller - executing on owning client that created the hud for the player controller. There is a really good tutorial from wes (epic games) that explains that stuff really well. https://www.youtube.com/watch?v=abmzWUWxy1U tutorial is a bit outdated but explains a few concepts really well regarding game mode, player controllers, character and widgets

[winged badger]

you can just run that from HUD BeginPlay instead of sending the RPC though

as right after post login, GameMode will call InitailizeHUD on the PC, which is a reliable client RPC under the hood

and PC then creates the HUD

clients don't really need to know the controller ID for anything, either

[narrow prairie]

its a debug..\

i just showed him an alternative way of doing it

i builded my game on this foundation

my bad i guess

[winged badger]

its not that terrible, its just one RPC you could do without

[narrow prairie]

blame wes

[toxic flint]

That was one of the first blueprint tutorials I followed; guess it couldn't hurt to go back and take another look.

[winged badger]

wes does okay presenting what unreal can do

but he is also an absolute terror when presenting how a well structured code should look

as his presentations are basically a collection of cheap hacks that scale terribly

[narrow prairie]

i only started a year ago. i dont have that much knowledge yet. thought i gave a share. but i had to choose a foundation one day. srry for my input

[winged badger]

don't be sorry, just be mindful that the video tutorials can usually be vastly improved upon 😄

input is usually a good thing

[narrow prairie]

i thought there was a reason he did it like this

[winged badger]

he did

[narrow prairie]

he said something about 2 players controllers

1 was on server

and 1 was on local client

[winged badger]

doing it proper would take twice as much time to record

as it results in more initial work, and far less pain down the road

which is okay when you're doing a 2 hour video, or a very tiny game i guess

when you do a larger project every early shortcut you take will come around to bite you in the arse

[toxic flint]

Ok, so I set up a HUD BP and use that BeginPlay and same result. The HUD info was a good pointer, thanks for that.

Thats in the HUD BP

[winged badger]

connect getowningplayercontroller to owningplayer pin

always good to have that ref

[toxic flint]

Done, no dice..

[winged badger]

you did disconnect the widget creation from the character, right?

(that wasn't going to help here, its just good practice to get used to)

[toxic flint]

loil, I was going to mentioned that because of my "issue" yesterday... Yes, confrimed that disabling the Hud begin play disables the hud

[winged badger]

that widget is centered on the player?

[toxic flint]

Centered on player?

Drawing a blank on that..

UMG anchor? top left

[winged badger]

keeps the player centered on the minimap

and rotates as player pawn rotates?

[toxic flint]

Oh, is a ScenecaptureComponent parented to the player, ya

I imagine I will move to 2d map at somepoint but really need to get a grasp on this.

[winged badger]

if it still misbehaves

check how its getting a player pawn

im off to bed

[toxic flint]

alright, thanks for the help

[hollow arch]

Hello, i search complète « formation » on c++ for multi on dedicated servor, i dont find, any links please ? :p

[toxic flint]

Are the player indexs a different random ordered every time you call GetGameState>GetPlayerArray? I guess that would make since if it's recreating the array everytime you call it; not sure why I just assumed it wasn't...

[winged badger]

they are not

but there is no guarantee of order on any of the GS instances @toxic flint

[toxic flint]

But I can assume that the index ids are sequential right? ie. 0,1,2... not 0,4,9...

[winged badger]

they are, but they are filled in order packets telling the clients to spawn a replicated PlayerState arrive

[toxic flint]

While debuging Im seeing instances where with two clients they both fail for index 1, has me scratching my head a little.. Ill figure it out with more debug.. just strange

[winged badger]

odds are it will not be identical order on all clients

[fleet raven]

keep in mind it can take a while for player states to arrive

you can have a character before the state

because that makes perfect sense

[toxic flint]

Sorry, Sometimes fail for index 1... it's seeminly random...perhaps race condition

[winged badger]

odds are you will have a character before the PS

as PS has a default NetPriority of 1, same as just any vanilla Actor

while pawns have 3

[fleet raven]

swapping that would still not guarantee order

[winged badger]

it would unless there is some packet loss

[fleet raven]

if the packets containing the first object are lost

[winged badger]

but you can't guarantee they won't be

[fleet raven]

or arriving out of order

as they come on separate channels there actually is no ordering between them

[winged badger]

is this still related to your minimap @toxic flint

[toxic flint]

Ya trying to follow the Pawns

[winged badger]

imo, best way to do that is to slap a UMinimapComponent on it, that registers itself with AMinimapManager locally

[toxic flint]

I'll have to look that up

[winged badger]

then you don't care about order of replication, when the Actor replicates, its MinimapComponent runs BeginPlay, which finds AMinimapManager (or UMinimapManager component on your say, GameState)

and registers with it

that way the Manager always has a full list of Actors that should be marked on a minimap

and its network independent

[fleet raven]

unless your object replicates before the game state

[winged badger]

it still won't call BeginPlay before the GameState

so its cool 😄

as OnRep_MatchState in the GS is what calls DispatchBeginPlay on the World

on clients

and in case of AMinimapManager actor, its placed on the level, so its loaded before any Actors are spawned, or call BeginPlay

[fleet raven]

that's not a thing when using game state base

[toxic flint]

Still trying to look up UComponent..lol

[fleet raven]

I wonder how it works then

[winged badger]

true, i would strongly recommend against GameStateBase in a multiplayer game

just because you don't have control over BeginPlay on clients

[fleet raven]

I guess in OnRep_ReplicatedHasBegunPlay

idk, GameState has all that unnecessary stuff in it

[winged badger]

entire core framework is weird unless you're making UT

[fleet raven]

lol what is this relic

[winged badger]

😄

ever looked at AutoManageCamera code?

[fleet raven]

that doesn't seem to exist

[winged badger]

its in PC

[fleet raven]

there's only AutoManageActiveCameraTarget

[winged badger]

it aggressively keeps setting the VIewTarget on your StartSpot/AutoManage Camera for PC index

ends up calling SetViewTarget 7-8 times

when you start the game with it enabled

[fleet raven]

[winged badger]

found that out the hard way, trying to manually set the view target on NotifyLoadedWorld after seamless travel

with that enabled

[fleet raven]

sometimes it feels like your game is held up by an extremely fragile layer of ancient runes that no one has explored in the past 2 decades

[winged badger]

and the runes are weird

travel from Map A with PC A to Map B with PC B, NofityLoadedWorld is called on PC A, controllers are only swapped when the ServerNotifyLoadedWorld executes (called right after)

it does make sense, but it also feels so inelegant

[fleet raven]

how about the absolutely insane process of non-seamless server travel

[winged badger]

and for us the life is good, when someone is stuck with BP only... yikes

    /** Return true if FindPlayerStart should use the StartSpot stored on Player instead of calling ChoosePlayerStart */
    virtual bool ShouldSpawnAtStartSpot(AController* Player);

this is one of the more bizzare gamemode functions

[fleet raven]

oh

is this why once someone joined the server and picked one of the player starts, they always respawn at the same one now until the map changes..

[winged badger]

yes

[fleet raven]

lmao so unnecessary

[winged badger]

and you can't override it in BP

[fleet raven]

well yeah can't have too many bp overrides

that would ruin the performance

since optimizing the 90s vm that spends 90% of the time in overhead is not allowed

[winged badger]

well, this one at least deserved a EditDefaultsOnly boolean that can be ANDed with return of that

[fleet raven]

someone should make a PR with faster blueprints

[winged badger]

last time they went for that and improved nativization, we lost default implementation for blueprint events on interfaces 😦

[knotty crown]

Is there someone who would be able to explain what is going on here?

[fleet raven]

no not nativization

something that works with modding..

[winged badger]

@knotty crown on server Pawn calls BeginPlay before its possessed, so the controller is null at that point

on client, the construction takes another route, so the Controller variable (what GetController returns) will have replicated before BeginPlay is called

so its valid there

[fleet raven]

and the clients don't see the controller of the other client

[knotty crown]

@winged badger THANK YOU!!!!!

This was driving me up the wall...

[winged badger]

with blueprints, only variables set via ExposeOnSpawn will get set before BeginPlay

(on server)

[knotty crown]

OK, do you know where could I read more about this topic?

[winged badger]

ActorConstruction.cpp? 😦

[knotty crown]

OK

[winged badger]

basically

[knotty crown]

Is there an event that is called on the server after a pawn has been possesed?

[winged badger]

OnPossessed

(it is not called on clients)

[knotty crown]

Is OnPossessed C++ only? I can't find it in the blueprint menu

[winged badger]

has to be one

EventPossessed

[knotty crown]

Sorry, found it

Thanks!

Dude, this is perfect!

Thank you so much!

[fleet raven]

is there one on the client side that I missed

[winged badger]

ofc not

you do have OnRep_Controller

[fleet raven]

I think we made a huge mess of trying to track the pawn changing for updating the hud

[winged badger]

but not from BP

i usually go for the SetPawn override in the controller

its easiest place to handle Pawn changes, also by far the most convenient with listen servers

as its directly tied with the PS and HUD

[fleet raven]

ah wait that wasn't it, it was linking up remote pawns and their player states

[winged badger]

you do have OnRep_PlayerState in Pawn iirc

[fleet raven]

yeah it's not a thing in bp though

[winged badger]

nope, most people end up sending a Client RPC because none of the callbacks are exposed to BP client side

[fleet raven]

the rpc could arrive before the actual object

[winged badger]

i think the most robust way in BP is putting a replicated variable of Pawn's type into the PS, and use the OnRep

it is redundant, but you do get the callback from it

the PS doesn't have OnRep_PawnPrivate

[fleet raven]

the way you can't easily scroll through bp like you can with code always seems to result in big mess building up in corners no one sees

[winged badger]

as it relies on Pawn to inject the dependency

[toxic flint]

ok, I'm going to go back to basic training (re-review the docs/tutorials) , because I have a serious misunderstanding of all of it..I really do appreciate all your help granted most of what was mentioned is Greek to me atm even after looking it up. 😛

This is what did me in btw..

Pressing m on each client added the hud to that client...still controlled by one of them

[winged badger]

you really shouldn't use statics to GetPlayerController

when you have easy relative path to do it

[toxic flint]

Im not sure what that means

[winged badger]

i assume that is Pawn, so its controller is GetController

[toxic flint]

That is getcontroller, is owningplayer

[winged badger]

GetPlayerController[index] is a static function

and its often misused in spectacular ways

usually resulting in wires crossed, especially if you use it on dedicated server

or in the RPC event

while on clients (not split screen) there is only 1 controller

[toxic flint]

Ok, but wont the fact that the hud shows up on the correct screen but controlled by the wrong players but odd

[winged badger]

so GetPlayerController[0] has only one controller to return

on dedicated server, that is the controller of the first player that logged in

how is it controlled?

@fleet raven yeah, i never do any networking in BP because its such a disjointed mess

[toxic flint]

That last test was on the characterBP.. Press "W" on client 1 map shows up on client 1, controlled by client 1 (rotation/location). Switch to client 2, press "w", map shows up on client 2, controlled by client 1 (rotation/Location).. All other things aside, I cant understand how that is happening

[winged badger]

and that bit where you set a replicated variable locally, then watch its OnRep fire locally bugs me to no end

controlled as in

pawn is in center, and map moves and rotates with it?

[toxic flint]

yes, the scenecomponent2d is parented to the pawn

[winged badger]

so its the wrong pawn

how does the widget itself get/set the pawn?

[toxic flint]

Is the last test, "W"? the Texture target or the Scenecapture is a CanvusRenderTarget, that is used in the Minimap material

[winged badger]

not what i asked

how does the widget pick the SceneCapture

[toxic flint]

I honestly have no idea

[winged badger]

you wrote it

[toxic flint]

lol, It's the terminology that's throwing me

The widget is the FPSHUD, yes?

[winged badger]

yes

[toxic flint]

That is being set on CreateFPSHudWidget>AddtoViewPort

FPSHUD is UMG WidgetBlueprint

The minimap is an image within that umg that points to the Minimap material

[winged badger]

wait, you have a single RT asset, and you're testing in single process PIE?

[toxic flint]

I have single RT target, that was one of me first thoughts yesterday

that it had to do with that

I was starting to look into dynamic RT creation

What is Single process PIE?

Oh I see yes

Was turning it of/on throughout testing, but for no is single process

[winged badger]

if all your widgets are using the same RT asset

they will end up overwriting it

[toxic flint]

they are..

yep...I really wish I would have mentioned that twice now...

Yep, I'm a idiot...

So save to say I can start looking at the RT angle again?

Honestly, I'm really happy if that is the problem, it would mean I'm not as incompetent as I thought I was; I mean still fairly incompetent , but salvageable. 🙂

[winged badger]

you have the ability to connect 2 standalone games yet?

[toxic flint]

Through editor and dedicated, yep

it's not pretty but it works

Thats interesting

[winged badger]

you should confirm its RT by running 2 standalones

hmm, even that might fuck up

[toxic flint]

Ya, thats the interesting part.. It works..better

still wrong pawn controller... but each client controls the others map

That I can probably solve

Is it worth addressing the RT issue then?

Yep, hooked up the HUD widget back up and it ~works with standalones...Just need to address the wrong pawn controller now.. I hope

[winged badger]

you should probably go and CreateRenderTarget2D per SceneCapture2D, cache it, then draw on it

and have the widget find the RT Texture by accessing it via GetOwningPlayerPawn

most elegant way is likely to make a custom SceneCapture2D, then have it create its own RT

[toxic flint]

I was trying something like that I think, just couldn't get it to work; wasn;t able to apply the RT to the component

Right now, 4 clients: one client controls 3 m,aps, 1 client controls the other.. Close 3 client controller, all three clients work properly...that made me laugh

*Close the client controlling the three and all three remaining work perfectly

[winged badger]

yeah, you really need a RT per component

i mean it would work fine packaged

[toxic flint]

ok, i'll focus on that then

[winged badger]

but not being able to test proper is not great

derive from scenecapture2d

have it create a RT if owner is locally controlled

on BeginPlay

[toxic flint]

I know what deriving is but what is it in terms of blueprints? creating a child BP?

[winged badger]

and then just access the texture from the widget with GetOwningPlayerPawn->GetComponentByClass<customscenecapture>->MinimapRT

you create a BP based on SceneCapture2D

then you get a SceneCapture2D component you can add your own logic to

[toxic flint]

Alright, I'll dig in on that.. thanks again

[toxic flint]

And I crashed the editor..Gonna guess I did it wrong 😛

Yep, it was me

[subtle patio]

When running a dedicated server and trying to create an advanced session, I'm getting this log

afaik I'm only trying to create the session once

anybody run into this error?

though.. the server is on the steam list..

doesn't show up in my server browser though

[mighty schooner]

In 4.24 preview 4 below code always return null in Client. Is it a bug or did Epic change way to access GameState class in client? I call this inside my custom player controller class after 10 seconds. GameState variable in World.h itself is null.

const ACustomGameState* MyGameState = GetWorld->GetGameState<ACustomGameState>();

[bitter oriole]

Should be GetWorld()

Provided that was a typo, check that the game state class is properly set

[outer radish]

Hi folks, having an issue with RPCs. If I send through too much data then server gets stuck on a loop, and all other RPCs no longer work. Here's a video: https://www.youtube.com/watch?v=6cfHDWsS0H0&feature=youtu.be

At first I add items slowly, then ramp it up, then finally just spam add them which is when it breaks. Any ideas? I could of course send less data and I will, but ~50kb kinda low isn't it? That's like 10 players moving around in terms of data

[rich ridge]

Does anyone ever tried to connect to dedicated server via python pawn

Or python player controller

[mighty schooner]

@bitter oriole that was a typo. It is setup properly because I have some functions there printing to the log when game starts.

[mighty schooner]

Just put a log inside BeginPlay of my custom game state and its never called on client but it is called on server. 😕

[winged badger]

did you forget Super::GetLifetimeReplicatedProps() ?

or Super::BeginPlay()

[mighty schooner]

Both are there

[winged badger]

did you override the MatchState logic in GameMode?

[mighty schooner]

No. Only PostLogin

And Super::PostLogin is included

[winged badger]

does anything on client call BeginPlay?

[mighty schooner]

In begin play only log is there

And it does print for server but client nothing/

[winged badger]

pawn, controller, actors on map?

do they call BeginPlay client-side

[mighty schooner]

Lemme check. I'll put log inside their BeginPlay and see. One minute

My custom game state is extended from AGameState and not AGameStateBase

[winged badger]

most common causes are

[mighty schooner]

I put a log inside PlayerController and PlayerCharacter BeginPlay and they only print when its dedicated server and not client. 😕

[winged badger]

missing Super in BeginPlay or GetLifetimeReplicatedProps (first won't call BP BeginPlay, and will ensure on newer versions, second won't replicate the MatchState, and OnRep_MatchState calls DispatchBeginPlay on client's world)

and if none of your Actors are calling BeginPlay on client, then you broke the GameState's RepLayout

or MatchState transition logic in the GameMode

[uncut oracle]

Does someone know the class that deserializes the network packets that the client receive from the dedicated server?

[winged badger]

each class has its own implementation of NetSerialize

@mighty schooner good news is that there are very few places where you can break BeginPlay on client

[mighty schooner]

But I've not overriden any of the GameState functions except BeginPlay and I called Super inside it. For GameMode also not overriden anny parent functions.

[winged badger]

added any replicated variables to GameState?

[mighty schooner]

Lemme try with default game state and see if player controller/character begin play is called in clients

Yes and its included inside GetLifetimeReplicatedProps with DOREPLIFETIME

[winged badger]

and that function has Super call too?

[mighty schooner]

Yup

I switched to the default game state and still log gets called only in dedicated server

I'm using ReplicationGraph in my project. Could that be an issue?

@winged badger Yup it was ReplicationGraph. Uncommented it from DefaultEngine.ini and now all begin play in client works.

First time using ReplicationGraph. When I enable it none of begin play in clients gets called and I have this warning spamming my log LogReplicationGraph: Warning: No Replication Lists were returned for connection

[mighty schooner]

Yay got it working. Was missing implementation of some functions in my custom ReplicationGraph. Thank you @winged badger 🙂

[worthy perch]

Because of the new Steam Hot Seat feature, have any of you guys decided to support that feature -- implementing local coop?

[smoky ore]

Update on my problem: moving the creating/joining session to GameInstance fixed it

[twin juniper]

Hi i have a probleme with createing a Listen Server ?

Error Code :

[2019.12.09-14.47.12:150][499]LogTemp: Display: ParseSettings for GameNetDriver
[2019.12.09-14.47.12:152][499]LogTemp: Display: ParseSettings for IpNetDriver_0
[2019.12.09-14.47.12:153][499]LogTemp: Display: ParseSettings for GameNetDriver
[2019.12.09-14.47.12:156][499]LogNet: ReplicationDriverClass is null! Not using ReplicationDriver.
[2019.12.09-14.47.12:156][499]LogInit: SteamSockets: Socket queue 131072 / 131072
[2019.12.09-14.47.12:157][499]LogNet: Warning: Failed to init net driver ListenURL: /Game/Maps/Developement/Devmap?listen: SteamSockets: binding to port 7777 failed (0)
[2019.12.09-14.47.12:158][499]LogNet: Warning: Network Failure: GameNetDriver[NetDriverListenFailure]: SteamSockets: binding to port 7777 failed (0)
[2019.12.09-14.47.12:158][499]LogNet: NetworkFailure: NetDriverListenFailure, Error: 'SteamSockets: binding to port 7777 failed (0)'
[2019.12.09-14.47.12:159][499]LogWorld: Failed to listen: SteamSockets: binding to port 7777 failed (0)

[red pollen]

You got Steam open on your PC?

And access to your internet network?

[winged badger]

New: Changed DOREPLIFETIME implementations to use a struct for its parameters, and exposed a new macro called DOREPLIFETIME_WITH_PARAMS to encompass older functionality.

not looking forward to upgrading

[worthy perch]

So instead of ClassName, PropertyName, it's... and what's WithParams?

[twin juniper]

@red pollen Jup

[knotty crown]

Does unreal have built in functionality for Client Side Prediction (and/or) Server Side Lag Compensation, or do deveolpers have to impement these themselves?

[bitter oriole]

For humanoid characters yes

Else nope

[knotty crown]

Yes to both server side lag compenstation and client side prediction, or just one?

[river hazel]

I would just say no to both of these

If you use character movement component and you have a client that is lagging

They will see everyone else's "old" positions and actions

And they will move "later" on everyone else's screen

Theres nothing that looks at how much they are lagging tries to account for it

And tries*

[bitter oriole]

Yes to client side prediction @knotty crown

[knotty crown]

@bitter oriole Do you know where the documentation for it is?

[river hazel]

There is simulation between server side ticks but that's not there to compensate for latency, it's more about tick rate...and you say humanoid character...but it's just character movement component you mean right?

[bitter oriole]

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

[knotty crown]

Ahh, its in the character component documentaton

[river hazel]

Theres nothing stopping you from having any other kind of character, the collision shape for movement is locked to being a capsule though:)

[knotty crown]

OK

So there is no built in way for the server to rewind time when checking for a hit on a networked character?

[bitter oriole]

It's worse than that, the physics engine doesn't have support for it

[knotty crown]

So you just need to implement your own ghost objects to lag behind each character on the server

[bitter oriole]

Something like that yeah

[knotty crown]

ok, thanks for all the info @bitter oriole and @river hazel !

[grizzled warren]

Noob here, is it better to create multiplayer functionality before making the game.
Or can I make a single player game and just add another player easily?

[bitter oriole]

You definitely can't add multiplayer easily

You also probably shouldn't start with multiplayer immediately before you kn ow the game is any good

[meager spade]

UT4 stores points

not a ghost object

but the last X amount of positions

the player was

check it out @knotty crown

[knotty crown]

@meager spade OOOHHHH

that sounds nice

[meager spade]

source code is on github

you cant "copy" it

but can use it for reference

[split drum]

@outer radish my understanding is, by default, you can only send 2 RPC per net update. You can up this with net.MaxRPCPerNetUpdate. You can also try upping the max server and client bandwidth

[grizzled warren]

Hmm I see. Then I'll add it once I know the game is fun

[knotty crown]

Thanks! @meager spade

[grizzled warren]

Thanks @bitter oriole

[river hazel]

You will most likely have to rework a lot of your game if you dont consider how multiplayer games work as you build the game though

Something as simple as picking up an object becomes hell in multiplayer

[bitter oriole]

Yeah, that's exactly what I hinted at earlier. It has to start early in production.

Just, you know, don't spend too much time getting multiplayer perfect before you know the game is about.

[outer radish]

@split drum thank you I will look into it 😌

[subtle patio]

Hey gang, still getting an error from my "create advanced session" call on a dedicated server's begin play

LogOnlineSession: Warning: STEAM: Cannot create session 'GameSession': session already exists.

Do I need to run a destroy session before hand? or check the server authority? I thought that was what "Is dedicated server" did?

[toxic flint]

Just a quick share for anyone who might have been following my issue and anyone else trying to set up multiplayer minimaps; this is what my final blueprint looked like (in HUD_BP). I did try the ScenecaptureBP method that was suggested but wasn't able to get it to work.

open to suggestions/improvement tips

Also, one of the key aspects that took a little digging to find (but now I see the ref everywhere of course) is that you have to convert the Texture sample in the map material BP to a parameter, then you can Set Parameter Value.

Also, Thanks to everyone who helped me on this; extremely helpful.

[subtle patio]

Right so Cannot create session was being called because I spelled the map, which I was trying to open after the session was created, incorrectly.. rofl
Server still not showing on the server list :<

[keen thorn]

Hi, has anyone here tried to create their own server backend for their ue4 games? like using nakama or similar libraries?

We are working on a server solution that can run at max 50mb per instance. UE4's built in server solution always runs at at least 200mb per instance, which is too much for us since we depend heavily on scalability of instances.

currently looking for similar projects, would appreciate if anyone could shine some light 🙂

[twin juniper]

Hi i have a probleme with createing a Listen Server ?
Error Code :
[2019.12.09-14.47.12:150][499]LogTemp: Display: ParseSettings for GameNetDriver
[2019.12.09-14.47.12:152][499]LogTemp: Display: ParseSettings for IpNetDriver_0
[2019.12.09-14.47.12:153][499]LogTemp: Display: ParseSettings for GameNetDriver
[2019.12.09-14.47.12:156][499]LogNet: ReplicationDriverClass is null! Not using ReplicationDriver.
[2019.12.09-14.47.12:156][499]LogInit: SteamSockets: Socket queue 131072 / 131072
[2019.12.09-14.47.12:157][499]LogNet: Warning: Failed to init net driver ListenURL: /Game/Maps/Developement/Devmap?listen: SteamSockets: binding to port 7777 failed (0)
[2019.12.09-14.47.12:158][499]LogNet: Warning: Network Failure: GameNetDriver[NetDriverListenFailure]: SteamSockets: binding to port 7777 failed (0)
[2019.12.09-14.47.12:158][499]LogNet: NetworkFailure: NetDriverListenFailure, Error: 'SteamSockets: binding to port 7777 failed (0)'
[2019.12.09-14.47.12:159][499]LogWorld: Failed to listen: SteamSockets: binding to port 7777 failed (0)

[exotic axle]

Do you have something else bound to port 7777?

I also searched up that error on the unreal forums, there's an outdated post on it: https://forums.unrealengine.com/development-discussion/blueprint-visual-scripting/56551-steam-failed-to-bind-to-port-7777

Dunno if that's even relevant. Also, I saw someone who was able to isolate the problem down to Steam on their computer, so try either running on a computer that doesn't have Steam or maybe just close Steam and see if anything is there causing it.

[royal isle]

@keen thorn I tried it once but left it in favour of the Replication Graph when that came out. Unreal has a socket library that lets you make both UDP and TCP sockets. What I was doing was that I created a TCP and UDP sender and receiver for my unreal actors and then a UDP and TCP sender receiver on a node js server for them to communicate. After that it was the wild west. I had to come up with my own protocol for connecting and disconnecting and then you need to completely rewrite any gameplay (and other) calculation in your own server so that it does its own collision detection and stuff. You can look into the NetDriver classes that do wrap the socket library and also the UNetConnection, UChannel, UActorChannel and FObjectReplicator so that you can somewhat understand how actors communicate with the server deep down in unreal's own networking system. Once you have a solid communication system established you can be as creative as you want with what you need your network engine to support.

[potent prairie]

got a tough issue. When 1 client enters a swimming volume, its Movement Mode is set to swimming and he can swim. That's working correctly. However, when a 2nd client connects, the server spawns this second client with movement mode Swimming instead of walking. I'm not sure why/how this is being set to Swimming for additional clients that connect?

[red pollen]

Where do you set the mode to swimming?

[potent prairie]

on the character when he enters the swimming volume. I'm setting it with a server event and then doing a client event that also sets it. So it works correctly for the most part when players are in the game running around. The bug is ONLY when a new client connects, he's set to swimming for some reason. The other players are fine

[red pollen]

Can you just not like

Set the movement mode on connect

To something regular

[potent prairie]

I wish it was that simple to fix but it isnt. I tried setting it to Walking on spawn on both server and client and still doesnt fix it

I just can't figure out why new connecting clients are being set to swimming on spawn

its weird

currently connected clients arent affected by it and can swim and all that fine

[winged badger]

BeginPlay - SetMovementMode

[potent prairie]

yep doesnt fix it

[winged badger]

breakpoint it, wait for that line to change the movement mode, then set a data breakpoint

so you see what changes it afterwards

[potent prairie]

is a data breakpoint different than a regular F9 breakpoint?

[winged badger]

yeah, you need to find a variable in Locals/Autos/Watch window

then right click and Break when this value changes

[potent prairie]

okay thanks Ill give this a try

[winged badger]

its limited to 8 bytes members, but its an enum so you should be fine there

[potent prairie]

wheres the Locals/Autos/Watch window

[winged badger]

debug>window>locals is what i usually go for

those are 3 different windows, either works

[potent prairie]

okay thank you, I found an even more serious problem, looks like my begin play is running each time a character spawns for each character in the world. Ouch

so ill get to fixing this and see if it solves the swimming problem

[red pollen]

Bit of a weird one, but I've been working on destroying sessions for the game today, and I've found a bug I can't seem to squash. It occurs when the host of a server (still in the lobby), quits. The session is destroyed successfully and everything works, clients are removed etc. But when that same player goes to host another server, other clients can find this hosted server but can't join. The flow hits the Join Session node, but this node just fails. Anybody had this before?

[potent prairie]

@winged badger so I'm not using c++ for this swimming thing, how can I check this in blueprint?

spent like 20 min looking for the Locals in the editor lol

[winged badger]

easiest way it to override characters beginplay in BP, and set movement mode to walking

then put a breakpoint there, and once it changes to walking

put a data breakpoint

[potent prairie]

okay

[winged badger]

shit, that was a spectacular brain misfire

[potent prairie]

okay so nevermind, even connected players are getting their movement mode messed up. So when a player enters the swimming volume, all other players get set to Swimming the next time they jump.

[winged badger]

not override BeginPlay in BP, but in c++

so you can easily access the CMC from where the BeginPlay breakpoint hits

[potent prairie]

its worse than that now, connected players are affected as well. i just didnt realize it because i wasnt jumping around with the clients

but once i jumpo they start swimming in mid air

even if they arent near the volume

its as if the swimming volume on the Overlap is affecting all clients which shouldnt be the case. never seen this before

[winged badger]

can be done if overlap event accesses GetPlayerCharacter[0] and executes locally

[potent prairie]

nah im using interfaces and all that, doing it correctly but im gonna remake it very simple style and see what happens. Maybe the water actor volume got messed up

yeah i dunno it must be the way im doing the overlap event. It's affecting all connected clients when one player enters/leaves the volume

https://forums.unrealengine.com/development-discussion/blueprint-visual-scripting/106590-changing-movement-mode-of-one-character-affects-other-characters

this guy talking about a similar issue, but didnt find a working solution

[tropic snow]

Anyone know why client to client bullets dont register sometimes. While in server its perfect..

[ocean geyser]

@tropic snow is the client properly trigging the server RPC? is the line trace/projectile spawning possibly missing on the server?

[tropic snow]

hmm how can i see if the line trace is spawning on the server? I find that when I shoot as the server... everything works fine. When I shoot client to client if I shoot on the arms no damage is done. Has to be dead center of the body when client to client.

[ocean geyser]

try this real quick. test with 3 clients (not dedicated) and have the 2 clients shoot each other and see if it hits properly

[tropic snow]

i've tested this with 2 clients not sure if 3 clients will make a difference but I'll try... (not dedicated)

[ocean geyser]

if it works fine then i think i know whats wrong

[tropic snow]

yeah still the same issue..

some times i shoot in the leg and it does not register...

has to be spot on mid body to register

[ocean geyser]

in your server RPC, draw a debug line so you can see exactly where it goes

another way which i would recommend due to peoples suggestions on here and my own implementations, do it on the client. perform a line trace on the client and send the HitResult to the server. have the server check and make sure it is a possible hit (like not shooting through a giant rock lol), if it is then use the HitResult that the client sent to the server to do what you want.

[tropic snow]

oh

for some reason the line trace is shooting upward on different client screens

[ocean geyser]

try this, go to your characters blueprint

one sec trying to find it

click your mesh and go down to optimizations and see what it is set to. set it to what is shown in the screenshot

[tropic snow]

didnt work probably because it's shooting from a sphere as oppose to the gun...

might have to tweak things.

[ocean geyser]

i would just go from client to server then, it will be very accurate that way as well

[tropic snow]

thanks guys!

[ocean geyser]

also when you tested with 3 clients, was it dedicated?

[tropic snow]

at least now I know the problem.

no

it was

non

just the sphere its shooting from

doesnt rotate

or um yaw

[ocean geyser]

ah, so the rotation is just on the client and not the server then

[tropic snow]

yeah... I believe so. Is there an option on the character?

[ocean geyser]

its honestly probably not worth replicating as it would just be one more thing thats networked if it doesnt need to be. you could create a socket on the weapon and use that as your starting location and rotation

is your line trace a multicast event?

[tropic snow]

yeah

for testing

I can't see the line trace on cleint if its server

[ocean geyser]

fair enough. i would go the client route then. perform line trace on client, send the result to the server (checking can just be done later), use the result that the client sent to do whatever it is you want it to do

[tropic snow]

👌

[ocean geyser]

in the future just do checks on the server such as making sure the clients starting point of the line trace and the end point where it impacted are within X distance from the servers same line trace (perform from the servers interpretation of your position and the same end point that the client sent in in the line trace result)

[lyric mural]

Hey, Im new to replication. I am trying to get my characters pitch replicated, but it is only casting to the server and not the other clients for some reason?

[hollow token]

@lyric mural i am new as well, but i think you need to multicast and set the function as reliable?? i think currently you have it set to run on server only??

[lyric mural]

It is multi casting and reliable, that is what the event is calling

[toxic flint]

What are you trying to do?

[lyric mural]

Get pitch to replicate https://gyazo.com/145ae8d2cc9eba73e32a1d612afa8927

[toxic flint]

@lyric mural have you seen this thread? https://answers.unrealengine.com/questions/45916/aimoffset-not-replicating.html Not sure if it will help, sorry new myself

[lone vapor]

the event is multi-cast, but is the variable replicated?

[toxic flint]

@lone vapor I think that's exactly what the thread is suggesting as well

[lyric mural]

thanks for that link, didnt see that when I was looking it up. And the look up/down rate? No

I will try that, thanks

[lone vapor]

There's a heap of tutorials available, just search "ue4 actor pitch replication"

[worldly hollow]

Currently completing a course on C++ multiplayer but this particular part wasn't really explained more just stated 'we need this for it to replicate"

What is the difference between :

which is set on the player character

vs
which is set on the weapon

What is the importance of that void GetLifetimeReplicateProps

[worthy perch]

I believe that's just to specify what properties to replicate (and how/when to replicate them).

[worldly hollow]

@worthy perch but i havent set anything in that void GetLifetimeReplicateProps (thats called a method right?), all i set is so it replicates right? but i thought "SetReplicates(true)" which is on the weapon actor already does that?

[worthy perch]

I don't quite understand what you wrote, but you typically just specify the replicated properties you want to replicate (which is a little bit redundant).
In your picture, you are replicating a property called SelectedWeapon on your ASRCharacter.

SetReplicates just means that the actor replicates.
GetLifetimeReplicateProps is for the actor's properties.

[worldly hollow]

you say "you are replicating a property called SelectedWeapon on your ASRCharacter." but i thought since SELECTED WEAPON is my weapon actor that inside it i set "replicates(true"). therefore I wouldnt have to do the first bit

[worthy perch]

Nope. And GetLifetimeReplicateProps is effectively useless if the actor isn't set to replicate.

[worldly hollow]

But GetLifetimeReplicateProps wouldnt work unless the setreplicates was true

on the other actor

[worthy perch]

Just mark your Actor to replicate, and add the UPROPERTY(Replicate)'d properties in the GetLifetimeReplicateProps.

[worldly hollow]

Yeah I understand that it needs to happen. I'm just trying to figure out why.

[stray tide]

i'm build aws-sdk-cpp for gamelift client sdk. But i ended error:
[----------] 1 test from HttpClientTest
[ RUN ] HttpClientTest.TestNullResponse
D:\Sources\aws-sdk-cpp\aws-cpp-sdk-core-tests\http\HttpClientTest.cpp(31): error : Expected equality of these values: [ D:\Sources\aws-sdk-cpp\build\aws-cpp-sdk-core-tests\aws-cpp-sdk-core-tests.vcxproj]
nullptr
Which is: 8-byte object <00-00 00-00 00-00 00-00>
response
Which is: 00000236562629B8
[ FAILED ] HttpClientTest.TestNullResponse (713 ms)
[----------] 1 test from HttpClientTest (713 ms total)

does anyone can help me?

[thin stratus]

@stray tide You might want to go to the GameLift forums with this, at least in addition.

[gritty lodge]

Does anyone know how to get the server to load a level streamed level? Basically, I want the server to load the level, and all the clients are loading the level at the same time. Once they are all loaded, I can start the match.

The problem I have currently is, I can load the levels on all the clients, but since the level is never loaded on the server, the collision isn't there and the first update from the server has all the characters fall through the ground.

Some of the tooltips in the engine seem to imply this is possible, but nothing comes up on Google. Is this not the way to do it, I find it hard to believe no one else has had this issue before. Thanks.

Or perhaps, if this isn't possible, I could try to figure out a way to have the collision geometry all be in the base level and have the loaded level only be art?

[stray tide]

It's sovled @thin stratus. It's just error from my ISP. I just disconnect from internet and it fixed.

[worldly hollow]

How come in Actors, in order to use the GetLifetimeReplicateProps method, I need to place this in the header file

But in Uobjects like Components I dont ?

[bitter oriole]

You don't need this AFAIK

I mean I never used that

GetLifetimeReplicateProps will be declared once you have replicating properties

[worldly hollow]

Im getting this : error C2509: 'GetLifetimeReplicatedProps': member function not declared in 'ASRGun'
When I dont

But when I put it in the header its all good

[bitter oriole]

Any Replicated UPROPERTY in ASRGun ?

[worldly hollow]

Just this

[bitter oriole]

I know I never needed to declare this method

[worldly hollow]

Yeah even in the course im taking. he [lecturer] doesnt either. But i have to it seems 🤔

and Im copying him line for line

i thought it was a version issue

[bitter oriole]

You really don't. If you have to, chances are it doesn't work either

No version from 4.18 to 4.24 needs it at least

[worldly hollow]

Hmm thats weird. : /

[bitter oriole]

Do you include UnrealNet.h in the cpp too ?

[royal isle]

Hey. With 4.24, the DependentActorList variable of the FGlobalActorReplicationInfo class is made private and the new getter returns a const reference to it so I cannot call non const methods like Add() or PrepareForWrite() and there is no setter. What am I missing?

[worldly hollow]

#include "UnrealNetwork.h" yes

but for components I dont have to declare it.

which i thought would have been the opposite

[bitter oriole]

Wait a sec

[worldly hollow]

k 👍

[bitter oriole]

Nah, works fine here without it. What's your header like ?

... And the cpp ?

[worldly hollow]

header: https://pastebin.com/kzJQ3Qc2
CPP: https://pastebin.com/i9Dx2RDg

hope that works

also hope this is what u meant : P

Its kinda messy. still tryna rap my head around MP C++

[bitter oriole]

And I mean, you did compile right ?

This isn't just the stupid error list in VS ?

[worldly hollow]

when i comment out the delcaration of GetLifetimeReplicatedProps it gives me that error

in the editor

[bitter oriole]

First things first

Never compile from editor

Close it, compile in Visual

[worldly hollow]

CTRL+SHIFT+B

or is that hot reload that is bad

[bitter oriole]

Never compile from editor

It only works in some particular cases

[worldly hollow]

Sorry to compile is that Ctrl+F7

build.compile anyway

[bitter oriole]

Solution -> Build or something

[worldly hollow]

I get this:

[bitter oriole]

Okay

Apparently it's a bug

You need at least UPROPERTY(Replicated) (not ReplicatedUsing) for the thing to generate

Sounds like bug-report material to me if confirmed

[worldly hollow]

Ah damn

[bitter oriole]

That might explain your components working fine

[worldly hollow]

yeah ok . Thanks for the info! Was annoyingly confused haha

is that just for V4.23 or for most recent versions?

[bitter oriole]

I never had the issue myself because i almost don't use ReplicatedUsing, and I'm guessing few people have it, so I don't know at all.

[worldly hollow]

awh man really , why not exactly?
cuz the guy Im watching seems to like using it

[bitter oriole]

Mostly I just rarely need events on changes of values

[worldly hollow]

Ah ok

@half jewel was that not the solution ?

[sick lintel]

<- gamedev student here, just about to pull out the last remnants of his hair. I'm currently the project lead on a student project, and I cannot for the life of me, figure out why when I use the "Create Session" node, it acts like it does, but it doesn't appear to be creating any session. (Or it's creating on and then destroying it) My fellow student who set this up originally used the "Blueprint Multiplayer tutorial series" and when following the tutorial, it works. It creates a session, then we are able to join the session, with both LAN and Steam (online subsystem steam is enabled)

However, when adapting his blueprints to integrate into our project, it appears to immediately destroy the session after creating it, and it follows the exec pin from "On Success" to Open Level (with listen)

I've installed the advanced sessions plugin and from the "On Success Pin" I've added the "Get Session State" node and it immediately returns "No Session"

This is a copy of the verbose logfile from a few minutes ago

Also of note: I'm a vfx guy, with only a rudimentary understanding of programming, but I'm stuck trying to get this to work, because the other students on the team seem to have lost interest in the project. (And their grade, apparently!)

[keen thorn]

@royal isle thanks alot for sharing! Can I ask why did you decide to use nodejs, and what made you switch back to ue4 using Replication Graph? Our issue currently is that each server instance eat too much RAM, so we decided to create our own server. Not sure if it was the same issues that made you decide to use nodejs.

[royal isle]

@keen thorn I wanted high player counts and rep graph provided that is all

[hoary lark]

you want to run dedicated servers for an Unreal game on < 50 MB RAM? ...

[keen thorn]

@hoary lark Yes, because currently ue4 server is single session. Meaning each instance will reload the whole base code all over again, which is too costly when scaling up number of instances. It would be different if the common code was to only load once and only allocate additional resources for new sessions data. Since this is not the case so we are building server side ourselves. Lucky for us we are not making realtime based games with physics/collisions.

@royal isle Cool, I'm very interested in rep graph also, can you shine some light or share some good docs for how to implement rep graph? thanks in advance 😄

[slender yarrow]

@sick lintel You have to make a custom GameSession and have the GameMode create a session when the dedicated server goes live

c++ GameSession*

[sick lintel]

Even though it’s a listen server?

[undone vapor]

hi. Does anyone know how to get the local player's camera location ignoring crouching?

So if the player is crouching then I want to get their standing camera location still

[sick lintel]

Can you just get the camera location when they are crouching and add the difference of their standing height?

*i.e., if their standing height is 92, and their crouching height is 50, then get the camera location and add 42? (just spitballing)

[undone vapor]

That's not working, for some reason it's off by 22 units

AFPSCharacter* DefaultCharacter = GetClass()->GetDefaultObject<AFPSCharacter>();
if (DefaultCharacter)
{
    FVector foo = GetPlayerController()->PlayerCameraManager->GetCameraLocation();
    foo.Z += (DefaultCharacter->BaseEyeHeight - BaseEyeHeight);

    GEngine->AddOnScreenDebugMessage(-1, .1f, FColor::Cyan, FString::Printf(TEXT("foo: %s"), *foo.ToString()));
}

[soft relic]

anyone knows how to do android multiplayer? I know replication and everything works the same but how will I connect it to something like Steam and how is it called?

[undone vapor]

Does anyone know how to get the camera location of a non local client?

[toxic flint]

Do you already have the character instance of the client? (not sure if that's the correct term for unreal, new and used to a different engine)

@undone vapor Something like this maybe?

Assuming you already have the character

[undone vapor]

That would work if I had a first person camera component

[toxic flint]

What camera are you using?, drag off on the character pin and type in your component name

[undone vapor]

I'm not using a camera component; similar to shooter game

[toxic flint]

ah, not familiar with that tutorial; you might need someone more experienced then me then. I'll slip back into the shadows again 😛

[slender yarrow]

Im still having problems with CharacterMovement. Movement is heavily rubberbanding on dedicated server in packaged and standalone game. This is my forum post with a vid and a little more info: https://forums.unrealengine.com/development-discussion/c-gameplay-programming/1694462-unexplainable-undying-seemingly-invincible-character-lag-jitter

Id be willing to pay someone well versed in this department for their time. if they can help me solve this.

[red pollen]

@slender yarrow Im just gunnah have a guess, even though I have no clue it may spark some conversation.

It looks like the FPS is low, to the point where the character is moving too fast for it to be smooth.

Could this be the case?

https://forums.unrealengine.com/development-discussion/content-creation/59643-how-to-cap-framerate-30fps-or-60fps-for-example

https://wiki.unrealengine.com/How_to_Change_FPS_Cap_,_Near_Clip,_Editor_%26_Game

[slender yarrow]

well i tell ya what

i just turned of framerate smoothing. And it does seem better

dont know why I never considered that

Yeah I acutally think this was it!

thanks

[hoary lark]

I was so busy last week, but did you ever confirm for sure that saturation wasn't just hitting 1 in Stat Net? changing your framerate might be avoiding the actual problem. you said you adjusted your bandwidth settings, does the net profiler show more than 9.9kbps now?

[slender yarrow]

no just 8.1 kbps

and ive cranked all NetDriver settings up anyway

this is with 2 characters running in PIE

[hoary lark]

well at least it looks like it'll go above 10 now there anyway. might be all clear then

[slender yarrow]

yeah. I appreciate the help

[gray scroll]

im setting active pawn variable from controller inside my character on possessed and then calling an event inside my controller which checks if active pawn is valid. Active pawn is none on clients but works fine on server... why would that be

inside spawn widget... activate pawn is none

im calling spawn widgets right after setting the active pawn too

[harsh lintel]

I would set replication of "Active Pawn" to RepNotify, and do what you want to do with it inside the RepNotify function @gray scroll

[gray scroll]

@harsh lintel smart

but i fixed it 🙂 added the setting of active pawn inside the owning client event

[harsh lintel]

yep that works too

[exotic axle]

How do I allow multiple players to possess a single pawn? For example, I have a tank. I want a driver player and a gunner player. There's no player models they're all just part of the tank.

[red pollen]

You'd probably have to separate the tank into several moving parts, and create pawns out of each one.

[exotic axle]

Grrrr that's gonna be pretty difficult because they're all 1 mesh

I'm guessing there's no way to do multi possession then?

[slender yarrow]

well it appears changing the FPS did NOT fix the rubberbanding. It looked like it did for a second. I made a new character in this same project and the movement of the character is very smooth. Im so lost....

could attached components cause a character to stutter and rubberband?

[jolly siren]

@exotic axle Why do you need them both to possess it? Have the controllers handle the inputs and just set their viewtargets to what you want

[rich ridge]

@slender yarrow so when dedicated server goes live, the game mode creates session.
Then the clients connects to dedicated server via open IP of ServerTravel.

Then after the clients are connected to dedicated server then they search for session on the dedicated server and then join it.

Is that correct flow?
Please help.

[worthy perch]

I think the flow is:
Server creates session.
Clients find session and join it.

[slender yarrow]

^

[rich ridge]

So what if I m using matchmaking

My matchmaking will match players and then spin up a dedicated server and return the IP,and then all the players have to Travel to that server.
Right?

[half jewel]

usually you contain the players in a lobby that waits for the server to spin up, but yea that's how it should be

otherwise any player can join that server by say someone on the server leaking the ip to someone. only players of that lobbyid can join etc etc

[rich ridge]

@half jewel if I m not wrong, it should be like this.

1. After matchmaking my players are in a lobby( some kind of map local to each client). And each client gets some kind of token which tells the client to join specific session.

2. After server is spinned up, the client will search for session with the given token.

3. And after that my players will start playing and killing each others.

[gritty lodge]

Does anyone know how to get the server to load a level streamed level? Basically, I want the server to load the level, and all the clients are loading the level at the same time. Once they are all loaded, I can start the match.

The problem I have currently is, I can load the levels on all the clients, but since the level is never loaded on the server, the collision isn't there and the first update from the server has all the characters fall through the ground.

Some of the tooltips in the engine seem to imply this is possible, but nothing comes up on Google. Is this not the way to do it, I find it hard to believe no one else has had this issue before. Thanks.

Or perhaps, if this isn't possible, I could try to figure out a way to have the collision geometry all be in the base level and have the loaded level only be art?

[rich ridge]

@gritty lodge actually you can define the server level in maps and modes option present in project settings

[viscid bronze]

I have built a multiplayer project that uses Steam Subsystem. I packaged a shipping build for my friend to use. However, I can't open Steam overlay, even though I can when I run it from the editor in Standalone Game. Is this supposed to happen?

[worldly hollow]

I assume you have steam open and running ?

[viscid bronze]

Yes. It is open on my taskbar

@worldly hollow

[worldly hollow]

Just double-checking what you're saying: Steam overlay works in standalone but not in packaged build?

[bitter oriole]

This is typical of shipping builds using Steam that were not started from Steam

You need to either start from Steam, or add your appid file in the executable folder

[viscid bronze]

then it should be fine
would it impact any of the multiplayer functionality? its just a blueprint multiplayer system

[bitter oriole]

Dunno, but I guess so

[viscid bronze]

ok

[rich ridge]

Hi guys any idea why find session returns 0 result

I have 3 dedicated servers running, one on cloud, one within editor and one inside terminal

all 3 are hosting session.

[OnlineSubsystem] DefaultPlatformService=Null

I have searched everywhere on Google, everyone has problem setting up multiplayer without Steam

[worthy perch]

You're just using the Null subsystem?
Then don't you need to manage the sessions and handle queries with some sort of server?

[bitter oriole]

@rich ridge I mean, the Null subsystem is obviously unable to work outside local networks

This is why people use Steam

"Null" means "nothing"

[rich ridge]

i dont want steam

any other way

[bitter oriole]

Well, then you need your own Steam

[rich ridge]

ok got it

Love you guys..

steam do need some engine modification

as per the doc

[bitter oriole]

I mean, the decision to use Steam or not is a business one

If you're selling your game on Steam you probably want to use Steam very much

Most PC games do sell on Steam

[rich ridge]

Yeah, I dont want to sell on steam

can i still use it

[bitter oriole]

Not really no

If you somehow get another game store to drive sales to your game, then you'd either use that platform's online infrastructure, or build you own

Though not selling on Steam is death to most games, if we're honest

[rich ridge]

what about epic sevices

my main concern is this only

[bitter oriole]

Epic has indeed committed to having their own infrastructure, some day, at an unannounced time

Nothing available yet

[rich ridge]

GDC2020

[bitter oriole]

Think 2021, imho

[rich ridge]

what if my game is available on android ios, can i still use steam

[bitter oriole]

No, you need to use the Play Store infrastructure, and the App Store infrastructure

Or your own service

[rich ridge]

so steam covers all the platform

[bitter oriole]

No, Steam is PC only

[rich ridge]

so this is useless for me

[bitter oriole]

I don't know anything about your game, so maybe 🙂

[rich ridge]

thanks for clarification buddy.

do you know any steam alternative

[bitter oriole]

There isn't any.

Because you have to be crazy, or very rich, to not sell on Steam

[rich ridge]

my target is Android and iOS

[bitter oriole]

Why are you asking about Steam if you're not even doing a PC game ? Check the Android online susbystem and the iOS online susbsytem.

[rich ridge]

this makes sense

[bitter oriole]

As far as I know they don't provide matchmaking though

[rich ridge]

Gamesparks

[bitter oriole]

The Gamesparks plugin for UE4 is dead so I wouldn't be too hopeful

[rich ridge]

what

[bitter oriole]

4.18 only

But feel free to try

If I can offer a suggestion, it seems like you don't have much experience with this stuff, so you might want to build something a bit simpler first 🙂

[rich ridge]

yeah

@bitter oriole ServerTravel and open IP is working fine for me. So what i can do is AWS FlexMatchMaking , then use AWS Lambda functions to spin up a dedicated server and return the IP to the clients, then do travel

[bitter oriole]

Then try that

[rich ridge]

so what suggestion u were about to give?

I have worked on really huge system which handles 100M + users.

so scalibility is not a problem to me

[bitter oriole]

That's great news, I hope things work well for you.

[rich ridge]

what about your suggestion?

please share

[bitter oriole]

What suggestion ?

I gave it to you

Try something simpler.

[rich ridge]

ohk, I thought u are going to give some advice.

u told to try simpler thing

[bitter oriole]

Yep, that's my advice

[viscid bronze]

I have a project that is Blueprint Multiplayer. It will be able to find each other's sessions in PIE, but it could not when I attempted to connect with a friend online. I also did not put in Subsystem Steam plugins at time of build. Could that be the reason?

[rich ridge]

@viscid bronze yes that's it

It only works for LAN

And still epic games didn't document it anywhere

It is meant to break your head untill you bleed.

[viscid bronze]

Its just the 2 tickboxes in Advanced Sessions Plugin right

I cannot believe this is a third party plugin

[rich ridge]

Bro it won't work

It was working for me locally, so I thought it will online as well, so I went ahead and deployed my Linux Dedicated server to cloud

[bitter oriole]

You need to use an actual online service for matchmaking on the Internet.

[rich ridge]

And I couldn't find session

[viscid bronze]

@bitter oriole but this is Blueprint Multiplayer
the Unreal youtube channel one

I thought it would work?

[rich ridge]

Bro it won't work

[bitter oriole]

It will work if you use an online service. Like Steam.

[rich ridge]

@bitter oriole if you carefully explore plugins folder and then online folder there are many online services, I wonder what they are for.

[viscid bronze]

He put it on 2 different computers though
https://www.youtube.com/watch?v=abmzWUWxy1U&list=PLZlv_N0_O1gYqSlbGQVKsRg6fpxWndZqZ&index=2&t=105s

[rich ridge]

Bro it won't work online.

I wasted my 2 weeks on this.

[bitter oriole]

The NULL online subsystem is basically a sample for your own service.

And a LAN version for until you ship

[viscid bronze]

@rich ridge well fuck
is there a tutorial that is for multiplayer that works online

[bitter oriole]

Matchmaking is a platform service.

Ask your platform.

Steam, PSN, etc

[rich ridge]

@bitter oriole is PSN exclusive to PlayStation

[bitter oriole]

Obviously

[viscid bronze]

@bitter oriole so I cannot send a copy of my game in Shipping Build to my friend, have him run steam in the background and play online?

it is listen server btw

[bitter oriole]

You can

Using the Steam online subsystem

Not the Null one

[viscid bronze]

Online Subsystem Steam?

[bitter oriole]

Yes

[viscid bronze]

okay

[bitter oriole]

One thing that looks unclear here is, UE4 is a game engine. It doesn't know who your friends are, whether you're banned for cheating, whether you have your console mutiplayer subscription up to date. It doesn't know that stuff because well, you don't log-in to XBox or PSN or Steam when you start an UE4 game.

The online platforms selling your game know this stuff - Steam, PSN, Switch, XBox, GOG, Epic Games Store, etc

All UE4 can do is provide less-or-more easy integration

Being a PC-centric engine with Steam as a monopoly, Steam has always been supported out of the box

GOG has a limited online subsystem available as a plugin too

I'm guessing every console build of the engine has a specific plugin too 🙂

[rich ridge]

whats is GOG?

[clear cave]

Hello, can someone help me with steam?

[rich ridge]

post your question, someone will definatey help

[clear cave]

look at the question, please: https://answers.unrealengine.com/questions/938792/run-steam-on-game-launch.html

[bitter oriole]

bRelaunchInSteam = true in DefaultEngine.ini

In the OnlineSubsystemSteam section

[clear cave]

Thank you, I will try it.

[viscid bronze]

@rich ridge another online PC game platform like Steam
but less popular

[rich ridge]

playfab

acquired by microsoft

[clear cave]

@bitter oriole it will only work with project that has been built?

[rich ridge]

@clear cave it is while packaging game i think

[clear cave]

@rich ridge Okay, it means I cannot test it without packaging the project, yes?

[bitter oriole]

How else would you test it ?

[clear cave]

just right click the .uproject file and pick 'Launch Game' option

no?

[rich ridge]

no

[clear cave]

okay

thank you

@bitter oriole If you've used this command, will the game wait until steam fully runs? Or the game will run and steam also in the background?

[bitter oriole]

I never used it because I want people to be able to run without Steam

But it should start Steam, ask it to start the game, and exit

So it will run the installed game in Steam

[clear cave]

okay

thanks again

[bitter oriole]

So ibviously you need the game installed through Steam to test this

[clear cave]

actually not. I tested it works well. Just the problem is that if you won't run steam you will not able to find online servers or host a game.

[viscid bronze]

a question:
if I run my packaged game from 2 different folders one the same PC and it works does it mean it will run over the internet

[clear cave]

nope

[rich ridge]

nope

[clear cave]

you should use steam like me

in order to work over the internet

or other sdks

[rich ridge]

playfab also offers to spin off your dedicated server

[clear cave]

is it free?

[rich ridge]

in a month only 20 hours

but gamelift offers free tier with 4-core and 2GB RAM instance

for 1 year

[clear cave]

have you used them? what about documentations?

[rich ridge]

nope

I m exploring all the possible providers

I have made up my mind on Linode

they are cheap

[clear cave]

Steam has a good docs with UE4 but you have to pay ~100$ to get your own ID

now you can use 1 free ID that made Valve for a game Spacewar

[rich ridge]

i don;t like steam which shares my revenue

[clear cave]

🙂

just u know, it's popular

we have nothing to do with this

[rich ridge]

I would rather build my own solution and host it

[clear cave]

Okay, good luck 🙂 I have to test my project)

thanks

[split drum]

Just to add to a conversation above, it is definitely possible to use NULL subsystem online and play with friends using a dedicated server build. I'm currently doing it for my weekly playtests. Obviously there are no matchmaking features included, just direct connection to the server

[bitter oriole]

If you do not use the online subsystem, you don't need the online subsystem to work online

Makes sense 😛

[split drum]

haha when you put it like that.. but the way I skimmed the conversation it seemed like people were saying it wasn't possible at all to play across the internet without a service like steam

[bitter oriole]

No, it is absolutely possible and you're right to add this here

What's not possible is using the online subsystem features with Null, online

[split drum]

makes sense, thanks for clarifying

[rich ridge]

@bitter oriole @split drum I m able to join the dedicated server via IP address, I wanted to do the session way.

[sleek current]

Hey, how can I for each client draw it's own debugstring?

[ocean geyser]

it usually says server: message, client: message, client 2: message and such doesnt it depending on the source?

[sleek current]

No, I mean to only show drawdebugstring on a certain client that overlapped with object

On client 2 I see the drawdebugstring from client1

[ocean geyser]

ah. i dont think you can with drawdebugstring

[sleek current]

I mean there is a way for sure but I don't know how to go with that

Either do a change inside engine or just play with replication stuff

[edgy kernel]

hey guys, i am still learning unreal and i know its too early to start doing networking. but
i am doing this multiplayer pirate game where u sail a ship and fight other players. like skull and bones for example
and i wonder how can i do the waves. because i want them all to be in sync. so when a player fires a cannon towards another player who is above a wave. the hit detection does not miss or bug

[sleek current]

That's a lot of math and it's really hard to replicate the sea/waves in terms of performance

That's too high imo, start with just the pirates meele fihting if so

[edgy kernel]

I wont do a melee combat its all on sea

[steady briar]

u kinda gotta build ur project with multiplayer in mind, its not easy to go back and throw networking into it. stuff like cannons is easy. movement is probably not too difficult but probably 95% of your time will be spent figuring out water math

[winged badger]

syncing the server time on clients between client/server via RPCs, letting that number drive the waves, giving the client hit authority, and when server RPCing hits, adding additional info to get the server side validation accurate enough @edgy kernel

and movement generally ends up being the worst part of it by far

most accurate time sync algorithm assumes travel time for packet to reach server is half the ping

you can't have server correcting ship movement because waves are 30ms out of sync, and they often will be

[edgy kernel]

What if i pre processes the waves for the next 10 seconds and the client will have timeline of the waves. And all they need to do is get their current position by thier local time.

The only downside i can think of is that players may use cheat to predict the waves. But i guess the can just do that by themselves just by looking.

This way i wont have to worry about them being out of sync. Dince the next 10 seconds would be already been buffered

[winged badger]

same problem, syncing times

except replicating the waves is very inefficient

or timelines

should be just dependent on gametime and a random seed, if you don't want predictable, server generates and replicates a seed

[edgy kernel]

from what i know, and i dont know if this is really true. it is ok to be out of sync for a couple of milliseconds. i read that even in shooter games. the server may be processing frame 40 while player a is 39 and player b may be still 38

[harsh lintel]

I have a server rpc that spawns an actor, after spawning it on the server, I'm calling a client rpc with that actor as a parameter, the actor doesn't seem to be valid tho inside the client rpc

[plain topaz]

I have an interesting question...I have a menu set up that lets a player cycle through character avatars. Is there a way I can change a DIFFERENT player's avatar with that menu?

[winged badger]

ofc you can, easiest way is misusing GetPlayerController/Character[0]

@harsh lintel stash the newly spawned Actor in a variable, and use its OnRep

[harsh lintel]

Thanks

IS this a spawn time issue ? Kind of curious

[winged badger]

RPC arrives before the package that spawns the Actor

having the Actor register with whatever has a reference to it also works

on client-side BeginPlay, just needs a replicated pointer to the interested object

set the same frame in which it is spawned

[harsh lintel]

yeah I thought about using BeginPlay, wanted alternatives

[winged badger]

Spatial allows for distributing an instance of the game over multiple dedicated servers, and is not free

don't know about the other two

also, if you need free servers, you should not be making a MMO

[edgy kernel]

maybe he need free servers for practice, learning or just developing

[winged badger]

the problem with MMOs is they are not the best learning project, as the scope is overwhelming

and to develop them you really need serious money

[normal vault]

^MMOs can be developed cheaply, so long as you got a LOT of time on your hands.

And that time allotment is, traditionally, more than most of us can afford. 😛

Which brings me to the point of my being here. Working on a "mmo" of sorts (kind of, but really... not really) And I'm trying to figure out something. I'm currently using python FLASK backend and REST CRUD/JSON as the API middleman, and I'm trying to theorize a way to create simple instancing (Which, with multiplayer... is never simple) and I've come up with an idea, but wanted to see if anyone could chime in and give me a rundown on whether it is, or is not, a good idea.

So, the site propagates API based dynamic URLs, as one would hope, and I was thinking I could run a run command on the server via flask to create instances that are tied to that particular URL path, call all the level specifics via API, and then execute unique instances for players to connect to as a result. The concept seems simple enough. The purpose is to provide a "guild space" for players, where they, as a team, have access to material editors, storage space, and the like. Now... what makes this even more interesting (Pain in the ass, more-like) is connection is steam based. So I'm thinking this will be a complete hell for each server spinup. But, I'm not sure. Anyone have any thoughts, or?

[south flower]

Hi anyone have ever tried using \Engine\Binaries\DotNET\NetworkProfiler.exe ?

I tried to open .nprof file using it but nothing happens

[hushed spire]

if we have a repnotify variable with no functionality inside the event
is that the same thing as just a regular replicated variable

[toxic flint]

So just read the proper multiplayer sprinting isn't possible with just Blueprints. Someone tell me it isn't true...

[lyric mural]

Im replicating my character and Im a noob.. What does it mean if it is properly casting the the server but client 2 is not seeing what client 3 does properly?

I have everything on a switch has authority to multi cast and server event

[rich ridge]

@hushed spire repNotify is a kind of callback that this variable's value has been changed, so if you want to update any other components then get this new value and update it. For example health of the hero , if he receives a damage then update the health on UMG

@toxic flint just try to tweak the MovementComponentInput present inside character class

[toxic flint]

@rich ridge Are you saying there is a way? What I have now works great right up until I simulate latency then the warping begins on start/stop sprint.

[rich ridge]

It you want your character to be sprinting then tweak few settings there and see if it fits into your requirements

There is no good way or bad of doing things, if it works then it works

https://wiki.unrealengine.com/Creating_a_movement_component_for_pawn

[toxic flint]

Alright, I'll read up up it. Thanks

[vivid seal]

Any way to Add Movement Input to a player from the server (in addition to the normal movement input from the client)?

[winged badger]

why would you ever want to do that?

and no, even if you hack it CMC will break

[rich ridge]

@vivid seal this is server authotitive movement https://wiki.unrealengine.com/Creating_a_movement_component_for_pawn

[vivid seal]

@winged badger fear effects that force the player to run in a set direction. More of a temporary override of the players input, but obviously if I just tell the client to do it it’s possible to cheat

[winged badger]

can't add input on 2 different machines, input is local only

[vivid seal]

Any way to force character to run in a direction that’s server-authoritative?

Aside from repossessing

[winged badger]

and if you were to hack it, FSavedMove in CMC would go badly out of sync

[vivid seal]

I’ll check out that link btw thanks

[rich ridge]

@vivid seal at your server if you arrive at condition when your pawn needs to move in certain direction set a flag, then in your override input function don't process input from user if flag is true.

[winged badger]

that is the easy part though

[vivid seal]

Yeah I’m setting the direction and override variables on server, but the client is still the one using those variables to determine input

Basically, the system I have for it works totally fine, but the client can just cheat and change his local variable and the server won’t even notice because Add Movement Input is done client side

[rich ridge]

@vivid seal that flag should be owned by server

Or it should exists in GameMode

@vivid seal I m not certain AddMovementInput is handled at client side

[winged badger]

it is

[rich ridge]

Usually I handle all the inputs via PlayerController

[winged badger]

you can override the _Validate functions in the CMC @vivid seal

kick the cheating client out of the game

[vivid seal]

Any way to do that in BP? Assuming no and that I’ll need to learn C++ to mess with CMC in any meaningful way 😦

[winged badger]

no way to do it in BP

[rich ridge]

@winged badger then he will have to build a system to detect cheating

[vivid seal]

I mean conceptually if I could override that stuff I would just add a few more flags to check that are my custom booleans (that the client is already checking) just to make sure the client didn’t bypass them. But if it can’t be done in BP I’m probably shit out of luck.

[winged badger]

problem with server side movement here is, for AIMove you'd need to possess the character with AIController and have a NavMesh

SimpleMoveTo was dodgy last time i tried it, but it has been a while

moving the character over Spline, or AddImpulse or some such will clash with the CMC

well, Spline not so much, but it will break animations