multiplayer

[north dagger]

World Settings Lobby Game Mode because it does not contain. unreachable to Player info.

I will be grateful if you could help me. 😫

[sonic ice]

Yo can someone with experience in steam multiplayer please send me a dm? I'm so close to getting it working I just need that little push

[eager geyser]

hey guys as shown in.yeti studios github, the client creates game session but if every client creates game session how will 2 clients join a single match. I had set the code for termination of game session from gamelift server side but that is possible if I create game session manually from cli. Neither in clinetsdk search or join game session is included. Do you have idea that what should be done

[olive pawn]

G'day all, im trying to make a ledge grab work in multiplayer but im having an issue where the flags im using dont seem to stick, e.g. my bool WantsToLatch will get set by holding spacebar and uunset when released, this is done via 2 RPC calls that do nothing but change the bool, then in the movement component tick it checks that bool and acts acordingly. this works perfectly in single player without a dedicated host, but with a dedicated server it looks like the flag is constantly being unset so i can never stay latched to the wall, any clues?

i think it has something to do with 'SetMoveFor' but theres very little quality explanation on how that works or how to think about code structure to work with this system

[vagrant osprey]

Is there any reason other than port forwarding that my session wouldn’t show up in the steam internet browser (shows up in lan)?
Also I am using the find sessions node temporarily for testing and it doesn’t show any sessions even though I see some in the steam server list

[meager spade]

@olive pawn firstly why TWO rpc's?

[vagrant osprey]

I assume because you can’t parameters to input actions functions

Not saying it’s the right way to go

Just my suspicion

[meager spade]

but still

if you are only setting a flag

one RPC is needed regardless

[vagrant osprey]

yeah i was just saying thats probably the reasoning behind it

[limber mortar]

appreciate everyone's help the last couple weeks, I'm uploading the changes to my server and hope to get my game going for people to play today

[limber mortar]

aw, it couldn't find my nativized blueprint

time to read some more, lol

[tardy cosmos]

hello, i was wondering if there is anyway to stop a server from listening...? Rigth now I have a lobby listening and after servertravel i want that if a player leaves, the server stop accepting new players

[thin stratus]

You'd simply deny them when they join

Just kick them again :P

Stop listening isn't a thing

[sharp pagoda]

"Stop listening isn't a thing" you would just close the listen socket, but yea the ideal solution is to deny join reqs.

[tardy cosmos]

but if I deny, i will still able to find those sessions when I look for one right?

I am using bp, so my options ara limited Rigth now I just look for a empty session randomly to join the client to any listen server. So if the client disconects after start a matchz and then try to find another one, the client will be able to find the match that left and he will try to reconect. Hiwever, if the server kicks him, the client will never be able to find a new match

that is why I was thinkin if therr is any option to just stop working as a server to not allow new conections

[thin stratus]

You'd need to have some sort of Flag on the Server entry

That you toggle to true/false

And then filter the queries with that

You can do that with the AdvancedSession Plugin I suppose

But that won't stop people from joining if they still have the session in their list

E.g. ->Refresh->Server is Listed->Players leaves->Player that refreshed list joins 1 minute later

So you gotta do both

[tardy cosmos]

so i need c++

[thin stratus]

As said, AdvancedSession Plugin can do that too

[tardy cosmos]

or pay for the plugin

[thin stratus]

The plugin is free

[tardy cosmos]

aah

I thought was premium

I will check it

thanks

Because destroy a session doesnt prevent to reconect right?

[eager geyser]

@thin stratus

[olive pawn]

@meager spade because having a single RPC that toggles the flag may accidently be sent twice and flip the flag to an unintended state

[meager spade]

That should never happen if done properly

[olive pawn]

and i might need to add additional functionality to one of the calls, not both

i agree it shouldnt, but this way its guaranteed

[gusty lily]

weirdest consistent networking bug. When we test a game on my laptop in multiplayer, the client pawn can move around as intended. on my desktop, everything is as shoudl be except on the server player cannt see the client player moving. client projectiles do spawn propperly on server, it's just that client's position never changes. what could be different about the two computers that might affect this? ideas appreciated.

[gusty lily]

seems to be not firewall related, also not specific to the modem/conection

i find it weird because movement doesnt happen over a specific port right?? also happens whether editor is open or closed

[worthy perch]

https://issues.unrealengine.com/issue/UE-62345
Maybe?

[gusty lily]

hmm. it could be similar, however i'm on 4.21 and have also succesfully hosted a game on this computer as a listen server
(with port forwarding). hard to test if I can connect to another (need to forward ports).

[bitter oriole]

Do check the firewall

Windows firewall often accepts outbound traffic, denies inbound

[real yacht]

can someone help here

both print strings are printed

but timer never

why?

and yes server calls are called also

[gusty lily]

i turned the firewall off (first thing i thought)

[winged badger]

@gusty lily , @bitter oriole if the server spawned the Pawn, traffic works both ways, local PC calls ServerNotifyLoadedWorld when its done loading the package, without it, it would never get constructed server side

[gusty lily]

oh thanks.

the connection is defiantely made, pawn is spawned and posessed on client end

[winged badger]

and unreal is either connected or its not

[gusty lily]

right that's what i thought. i thought it might be steam, but a steam works from my laptop, all other things equal

i thougth it was my desktop until i successfully hosted a listen game (steam had not been working).

i'm suspecting something up with steam being used on multiple computers, even though it was closed on one while the other was being used

[real yacht]

anyone?

[thin stratus]

@real yacht Why do you call ServerRPCs on the Server?

Authority Exec on the Switch node already means that you are on the Server

[real yacht]

solved timer problem..

[thin stratus]

You still need to resolve your RPCs

[real yacht]

im not sure that i have understand you right now :/

i have my power up spawned from game mode

and it's replicated

[thin stratus]

This

Makes no sense

Authority is the Server

Server RPCs on the Server aren't needed

Either this needs to be on Remote (limited to the owning client)

Or you don't need them to be RPCs at all

[real yacht]

oh okay, you want to tell me that switch and rpc are redudant

@thin stratus

[thin stratus]

The Switch might not be redundant

But the ServerRPCs are

[real yacht]

yes, okay, make a sense, thnx

because i want to have client and server functions

[thin stratus]

SwitchHasAuthority means the Authority EXEC PIN calls when this is on the Server.
The Remote EXEC PIN calls when this is on the Client.

[real yacht]

i want some cosmetics stuff to be on client

[thin stratus]

EXEC PIN is the white line basically

A ServerRPC is only needed if you want to go from Client to Server

And that also nly works if the Actor you are calling this on is owned by the Client that calls it

So calling a ServerRPC when you are already on the Server makes no sense

[real yacht]

yes, understand, thnx

so my idea is when player collect pickup

to be collected on server and not on client

so switch on authority is ok?

[thin stratus]

Yes, if whatever event you are calling there is executed on everyone, then filtering it with the SwitchHasAuthority node is correct

[real yacht]

okay, so next questioon is

that i have timer in pickup, and that timer tick, is it better to start timer on server

or client?

[thin stratus]

That depends who should be running that timer

[real yacht]

pickup self

[thin stratus]

No I mean

Should Server or Client run it?

That's nothing I can answer

You need to know that :D

Should that Timer execute stuff for the Server or for the Clients?

[real yacht]

it should execute stuff on client (some ui cosmetics, timer run out, etc)

[thin stratus]

Yeah then it should run on the Client of course :P

[real yacht]

okay thnx 😃

[real yacht]

this will be executed on every client, right? client1, client2, etc...

so my pickup will be invisible

my question is, how can i only display UI on player that have picked up object

in this remote line

[thin stratus]

Well that Pick is not owned by any client or?

It's just standing in the level ,or?

[real yacht]

pickup is not owned, just spawned, and later picked up buy player

just picked up

[thin stratus]

Also be aware that a ListenServer does not count as remote

[real yacht]

and set to invisible, etc

[thin stratus]

Are you using ListenServers or DedicatedServers?

[real yacht]

dedicated

[thin stratus]

Okay then it's fine

Ehm, well if it's not owned by anyone then your best bet is to add a PlayerController reference to the function itself

So you can pass the player who picked it up

[real yacht]

so i can call on that player

[thin stratus]

Well idk where you call the Pickup stuff

[real yacht]

some event to show UI

i call pickup in my player when collision happen

[thin stratus]

Right

There you could do "GetController"

Cast it to your custom PlayerController

And pass it into the "PowerUpPickedUp" event

Something like this

Just imagine that event in my screenshot is your interface function

PickingUpPlayer is my custom PlayerController class

[real yacht]

let me try

tell me, i need to ask is it valid

[thin stratus]

Something like this

[real yacht]

because its called on every client?

or?

[thin stratus]

That's just very rough code, nothing that will work

Yeah

Cause the Controller won't exist on the other clients

It only exists on the owning client

ANd on the Server

But Server is the Authority pin so we don't care about that

Just make sure that if you pass the PlayerController

Do it somehow like I did above

cause again, GetController isn't valid on other Clients

[real yacht]

understand, thnx

@thin stratus it works!

i have just passed controller as input in my interface

[thin stratus]

That is also fine

You can cast it in the PIckup too

Doesn't matter much hehe

[real yacht]

😄

[azure karma]

Hello, I have made a door BP wich works fine, Players are able to open and close the door and everything gets synced. Now I would like to use this door and add it to a House BP as a component. What is the best way to do this? 😄 I just dragged the Door into the House BP and it is not even visible 😦

[main spindle]

Hello guys, I am working on a card game prototype which I want to be multiplayer, I've played around with the multiplayer blueprints for about two days, and managed to make a game which both players can join. however, when trying to do a super simple replicated function, I simply can't get it to work. I'm trying to make it so that when you press a button on one of the widgets, all the players scores go up. I do this thorugh casting to each player, which server runs it to the game state, where I increase a replicated value, however it only works on the individual clients and doesn't change on any of the other ones? I don't understand what I am doing wrong

I've tried many different configurations of casting directly to and from the game state instead and from the widget and stuff but I can't get it working at all

[dark sandal]

I need big help im stuck for a while now :/

so if i play my game directly from the level

everything works fine

but if i use a main menu to open the level and load it like that

i get this error

[main spindle]

I think it may be some problem with the actual connections or something cuz when printing the player array it only shows one entry

[dark sandal]

thats my blueprint thats giving problems

[main spindle]

it's probably some default spawning issue

[dark sandal]

wait i fixed it 😛

[thin stratus]

What's with all the delays?

I really hope you don't use them to fight accessed none errors :D

[main spindle]

Cedric do you have any idea what I might be doing wrong?

I'm reading through your networkd compendium right now and I thought I did the same thing as you

[thin stratus]

Well

[main spindle]

ah never mind I'm an idiot wow

[thin stratus]

In your Widget -> GetOwningPlayer -> Cast to your PlayerController class -> Call a ServerRPC -> Get the GameState -> Increase the value.

That's it

Given you specified the Owning Player when spawning the widget

[main spindle]

It's funny you wanna know what it was?

[thin stratus]

Also please don't use Delays to bypass errors if that's what you are doing in your screenshot

[main spindle]

I had done everything right, but since it's a card game I wanted each player in a different level, so instead of making a listen level where they are all on the same one, I made each one go to a separate one

completely forgot about that

now it works

[thin stratus]

but since it's a card game I wanted each player in a different level

[main spindle]

also, what's callserverRPC?

[thin stratus]

That's not possible

[main spindle]

Yeah I noticed lol

[thin stratus]

Well whatever your ServerRPC is called

[main spindle]

I don't have one of those lol, is that further down in your documentation?

[thin stratus]

Well you need a ServerRPC to go from Client to Server

Otherwise you can't modify the Value

Replicated Variables only do that if the Server sets them

If a Client sets a replicated variable, it won't change for anyone but them

[main spindle]

So it's just a "execute on server" replaicated node then?

[thin stratus]

Correct

[main spindle]

ah I understand

[thin stratus]

CustomEvent set to Execute on Server

[main spindle]

thank you

[thin stratus]

And if it's an important one time call, also marked as reliable

Has to be called inside of an Actor that the Client owns

And which is replicated

(Check Ownership in the Compendium)

[main spindle]

I'm not sure if I wanna make anything reliable here tho since everything needs to go in a precise order in a card game...

[thin stratus]

That has nothing to do with it

Unreliable or not will not change anything about order

RPCs aren't ordererd anyway

[main spindle]

doesn't it prioritize the order if it's reliable?

but it can kinda skip the cue?

[thin stratus]

Afaik, no, but even if, you can't rely on that anyway

[main spindle]

oh ok

[thin stratus]

And if they are unreliable, they can be dropped

[main spindle]

aaah

Ok

[thin stratus]

And will never reach the server/client etc.

Which is far worse

[main spindle]

so that's for like, particle effects and such

[thin stratus]

Yop

[main spindle]

I see

[thin stratus]

Affects don't matter that much

So they could be dropped

[main spindle]

okokok

[thin stratus]

Also the order in your card game should be maintained by the Server anyway

He should know who's turn it is etc.

I don't see the order of RPCs being a thing here

[main spindle]

Also, whilst you're here and being super helpful (big thanks), when making something like this, what do I do different to make a dedicated server? Right now one of the actual players are hosting, but if I wanna do it dedicated how do I kinda start that server up in blueprints?

[thin stratus]

You don't

A DedicatedServer, later, is a compiled version of your Game that runs as a standalone.

Usually via console

You need to download the Source Code for UE4 for the engine version you use

And compile it

There are guides for that

In code itself, the only difference is that you need to filter differently

e.g. SwitchHasAuthority has Authority (Server) and Remote (Clients) as options

For a DedicatedServe setup, you can handle all players as Remote

For a ListenServer setup, you need to also handle the Authority as a Player

Cause for the ListenServer, it will still call Authority

If you start a DedicatedServer, it will usually automatically start listening

That's what the "ServerMap" is for in your Project Settings

[main spindle]

ooh

Do I put the maps that will be played online there then?

or a separate one

[thin stratus]

Your Game Content is cooked. You basically package your Game as you usually would.

Let's say you package it into C:/PackagedGames/YourGame

You can then go into C:/PackagedGames/YourGame/Binaries

And start the "MyGame.exe"

And play your game

For a DedicatedServer

You'd compile a "MyGameServer.exe" (via Guide)

And swap that out

WIth the MyGame.exe

So they both use the same content

[main spindle]

aaah ok

[thin stratus]

For C++ projects, you can usually mark things as #SERVER_ONLY code

Which when you compile client and server code

Gets used/stripped out

But well BPs

[main spindle]

and, do now in the code I'm writing, automatically open a session on beginplay with a "has authority" thingy on it so that the dedicated server will make a new session the second it starts? And then the clients can just connect?

[thin stratus]

Yeah, usually people with DedicatedServers also have some C++ experience. While you can do that in BPs

C++ offers a "RegisterServer" function

That can be used to create a session

But I guess you can do it in the GameMode

And then just do "IsDedicatedServer" -> TRUE -> CreateSession

GameMode only exists on the Server, so check if Listen or DedicatedServer is enough

[main spindle]

thanks a fuckton man

there will probably be some more fuckups and questions coming but you really helped me out here in the beginning!

Does the dedicated server have a player controller tho?

[thin stratus]

Tricky, never really checked that. I would say no

He has all the players' playercontrollers

But doubt he has its own. Wouldn't make sense

[main spindle]

Then can he create a session himself? since it needs a playercontroller to do via blueprints

[thin stratus]

Hmmmmmmmmmmmmmmmmmmmmmmm

Well you need AdvancedSession Plugin anyway for this

You can't use the default nodes

[main spindle]

oh

[thin stratus]

Default Nodes only work for ListenServers

Cause usually you have more options for the session

like "IsDedicatedServer" (which is false by default)

And "bUsePresence" (which is true by default)

Which you need to swap for a dedi server

Presence is something only a user has. Since a DediServer is not a User, you can't use that

It would actually crash the server iirc

[main spindle]

can't find the advancedsession plugin

ahd bitbucket

[thin stratus]

Never used it, so not sure where

But it's widely used

[main spindle]

You only use C++?

[thin stratus]

By far not only, but for all kinds of Multiplayer stuff, yeah.

[main spindle]

uhm it just crashed my whole project lol

phew that was scary

Ok well guess I'm going the player hosted approach, will that still work with over network multiplayer?

[meager spade]

ofc why wouldnt it?

[main spindle]

Yeah well do I need a public IP do that then?

[bitter oriole]

@main spindle Player hosted would typically work with sessions

With Steam for example

[main spindle]

yeah ok

[gleaming vector]

what is the best way from the player controller to detect that you've left a server?

[main sentinel]

@gleaming vector You could override Event OnPostLogin on your GameMode

ops

[gleaming vector]

i need it on the client

[main sentinel]

OnLogout*

[gleaming vector]

so that wont work

I have some stuff I need to clean up whenever the player leaves the server

on the client

so it needs to happen in the player controller or game instance

or i guess it could happen in the local player

[main sentinel]

maybe you could send a RPC to the other clients when someone disconnects?

[gleaming vector]

i dont care about other clients

i have a client connected to an outside service

when they leave a server, i need to disconnect from that service

[main sentinel]

I think there's an event that you can override on your player state or player controller

which detects network errors

[gleaming vector]

this needs to happen in all cases where there is a disconnect, including network failure

[main sentinel]

Event NetworkError

[gleaming vector]

that just covers network errors

never gets called on a valid disconnect

(this is why i'm asking, there has got to be a catch-all event)

[main sentinel]

I don't know if you can use a single event for that

when you manually disconnect yourself you already know what to do

and also use NetworkError to do the same stuff

wouldn't it work?

[gleaming vector]

that could, but i'm sure there is something somewhere

that handles all cases

there is a DisconnectDelegate in FGameDelegates

i bet that is what i am looking for

the comment says network failure but it looks like it fires in all situations

[languid sapphire]

question for y'all. I am trying to avoid building a dedicated server from source, so i've been using the "-server -log" flag on the project file, however, I'm trying to add a function in my gameinstance to detect if there is a dedicated server running and join to it, however ClientTravel and OpenLevel doesn't allow me to do it because to get a UWorld pointer would always be null due to if the project is running dedicated server it doesn't spawn an actual world. how can i detect dedicated server and host if i'm running a dedicated server and join if not?

i'm using c++ btw

[meager spade]

why wont you buuild the dedicated server from source?

[bitter oriole]

@languid sapphire Can't run dedi without source

[languid sapphire]

okay let me ask a different question then

if i build dedicated from source, is there a way to not have visual studio recompile the entire engine each time i have to clean/rebuild the project or do i just have to wait?

[meager spade]

build the source

[languid sapphire]

because i built source, then tried to compile for dedicated, but each time it seemed to rebuild the ENTIRE engine

which seems excessive

[bitter oriole]

Don't clean your project

[fleet raven]

why do you think you have to clean/rebuild

[bitter oriole]

^

[languid sapphire]

well i'm using plugins that seem to mess up sometimes if there are intermediate files

[meager spade]

intermediate fucks up

always has issues with them

but

[languid sapphire]

yeah so how do i avoid that?

[meager spade]

you should be able to delete intermediates, regen soloution and build, it shouldnt build the entire engine

at least it doesnt for me

[bitter oriole]

Don't do dedicated 😬

[languid sapphire]

because it's not really reasonable to wait 20+ minutes if i change a few lines of code lol

[fleet raven]

don't ever click clean/rebuild in vs

when using a source build

[languid sapphire]

should i just delete the intermediate folder in my project instead of cleaning then?

[fleet raven]

as it will clean everything used by the target (including the engine)

[meager spade]

yes

[fleet raven]

instead, manually delete binaries and intermediates

[languid sapphire]

i'm using NoesisGUI which fucks up crazy if i don't clean often

okay cool

[fleet raven]

did you report the problem to the plugin developer yet

because that doesn't sound normal

it should just work

[languid sapphire]

not yet, i will, i've only been using it for a short while

okay but i think that problem will still occur even if i build from source

because the problem i'm having is with UWorld references

[fleet raven]

I haven't seen any problems with building plugins, but I don't use many either

[languid sapphire]

i'm trying to have my gameinstance just join from ip, if the dedicated server is running it crashed the whole thing complaining about the UWorld class being null, same with character reference

listen server works fine, but dedicated just crashes

i had built from source before i tried the weird project file command line flag

[fleet raven]

well

maybe you're doing something wrong

did you forget to set a server startup map

[languid sapphire]

i definitely have the server startup map set

[fleet raven]

then you'll need to look at the callstack and figure out what is wrong I guess

[languid sapphire]

i have a host function i use to trigger the hosting of the map. but if i try to directly do "ServerTravel" or "OpenWorld" it seems to have trouble grabbing a world instance

i'm not using a "GameSession" could that be why?

I'm just doing a basic servertravel with PostSeamlessTravel doing other stuff

but it doesn't even get that far

[twin juniper]

Hello everyone I have been wokring on converting my project to multiplayer. Right now I have a problem where the server value only matches clients 1 value. What I'm trying to do is only have collision on the chunks that the players are in. But it only works with client 1. Any tips?

[twin juniper]

thats the only way

if you notice theres much less that goes into dedicated server target, while full engine is some 1800 pieces the dedicated server is only around 700-800

[unique thunder]

If I do this:

Locally cast to GameInstasnce, get Text variable > server RPC passing the value in > set RepNotify Text variable.

Will my client have the correct value for use in a local RPC? For some reason the first player who joins my ded server has access to his own via the client RPC but the second client's is null for himself.

[rare cloud]

@unique thunder from where you does this ?

[unique thunder]

player blueprint @rare cloud

[rare cloud]

I dont think you need to replicate the whole text since client can get those data

[unique thunder]

I do need other clients to also know the username value so I figured RepNotify would allow me, the server and everyone else to know it (even if they join late) - no?

[rare cloud]

oh ok it's something like motd

can you show your BP ?

[grand kestrel]

GameInstance is not replicated, you can't use an RPC

You probably want to be using GameState

[worthy wasp]

not understanding how i dont have a valid pointer here - none of the casts fail and the IsValid branch of hte GetAllActorsOfClass IS VALID..... but my gamemode is spitting out "Accessed None while trying to access 'Bridge'"

https://puu.sh/D8KiF/5d91cba5ea.png

this object is a statically placed actor in a level.... if i do the GetActorsOfClass() up in the gamemode - the length of hte array is 0 - not sure why that is either.

but her e- i can debug string the length in this actor class - and it returns 1 (as expected)

its definitely losing its value in the RPC.... i print stringed the server RPC displayname of the passed object and it is blank

but if i do it up in the local funct - it returns the proper displayname

[unique thunder]

if I spawn an actor via local RPC, can't I destroy it via one as well? spawn works, destroy does not

[grand kestrel]

It should

You can even locally destroy an actor that is spawned via replication

Gonna double check this for you

@worthy wasp That means it doesn't exist where you're sending it, or its not replicated (and thus isn't matched up)

[unique thunder]

Thankyou. I'm gonna do a Valid check, maybe the var I'm populating on spawn isn't valid for some reason

[grand kestrel]

@unique thunder To confirm/correct myself: You can destroy any actor you are the authority of

So if you spawn it locally, then you are the authority

[unique thunder]

Yeah I assign myself as owner on spawn

Then set the return > variable

Then destroy later

[grand kestrel]

Are you calling destroy on server as well?

It might be replicating (esp. if you have 0ms latency) the destroy before you call it locally

Oh nevermind

Lol

[unique thunder]

No, but I don't want the actor to exist on the server. I want to spawn and destroy it locally only

[grand kestrel]

My brain died

Yeah sorry

Anyway yeah, validate it, also validate the role

On the local client it should return ROLE_Authority

If it was spawned on the local client

[unique thunder]

wait

it looks like the variable I set the spawned actor to is null

when I try to destroy it

but I'm setting it using the return value of the spawn node

🤔

I have a cast between the 'set' and the spawn

[grand kestrel]

Would need to see it

Oh, then its failing the cast

[unique thunder]

Ah, interesting....

wait

It can't be failing the cast because I have an 'attach to component' node afterwards

That does run

[grand kestrel]

IsValid the GetUserWidget

[unique thunder]

If it didn't, I would never see the actor. But I do see it

[grand kestrel]

Ah

[unique thunder]

yeah, confirmed no cast fail

could the cast be creating enough of a delay to have the return value be null from the spawn node by the time it reaches the set var?

this is trange

strange*

[grand kestrel]

And if you do a print string right after the 'set' with the display name it prints as expected?

[unique thunder]

I use the variable for the attach target

so if that works

the var shouldn't be null

ill try a print as well

[grand kestrel]

Show me the RPC

"if I spawn an actor via local RPC" <- this implies you spawned it after a 'run on owning client' rpc from the server?

There will be a point that isnt visible in your screenshots where the issue occurs

[unique thunder]

Yes. Server RPC > Client RPC > Function (inside of which spawn occurs)

The print after the var is set is accurate

[grand kestrel]

Need to see the rest of the graph

[unique thunder]

Okay sec

Hopefully it's readable with zoom

This all works, for sure

The var is set etc.

Then,

[grand kestrel]

Everything after the set is what I really need

[unique thunder]

On damage event, if my health <=0 then I run this local RPC:

This is all that happens after the set

I just attach it to my controller (VR)

I had a print set up before the return node to get the display name of the set variable and it came out right

In the img above with the red, it throws the Invalid

I'm not overriding it anywhere else at any time

[grand kestrel]

Just to be clear, it doesn't get destroyed either

After you call that

[unique thunder]

No, that's actually the problem. When my player dies, I can see the UI stay behind. in some cases, the player will respawn and find the UI floating where he died

Hahah

[grand kestrel]

Well, somewhere Wrist3D is being nulled

[unique thunder]

That's what confuses me

Global search ^

It's only ever set once, where I showed you

🤔

[grand kestrel]

What else does the InitWidget do thats off-screen

@unique thunder Are you absolutely certain the client never calls this itself https://i.imgur.com/qsJGidH.png

[unique thunder]

It does, on beginplay

Ohh

[grand kestrel]

It will run it as a function

Due to incorrect net role

And whatever is coming last is overwriting it with null

Put a switch has authority -> authority -> before it

You may find it never attaches

[unique thunder]

On beginplay, I run an event that uses a SwitchHasAuth and continues on Remote. I cast to gameinstance to get some variables and then I run the server RPC that calls that widget event.

[grand kestrel]

GameInstance can not call RPC

[unique thunder]

no it's still in the player BP

but I need my local game instance to pull player variables

[grand kestrel]

Ah

[unique thunder]

before I run the RPC

I pass the variables in through it

but that same RPC happens to call the local widget event

[grand kestrel]

But if you do SwitchHasAuthority -> Remote thats never gonna RPC

[unique thunder]

it's just for timing, I need the widget to initialize after the server RPC is complete (so at the end of it)

oh

[grand kestrel]

Because a remote client can't call an RPC to another client/itself

It'll just run it locally as if it were a regular function

[unique thunder]

That's strange.. I have repnotifies set up to that server RPC and they work correctly ...

It replicates the data

It calls a server RPC

[grand kestrel]

Anyway, I still haven't seen the whole graph, so I can't tell you where to fix

[unique thunder]

It's on a ded server

[grand kestrel]

My food arrived, I'll look later if you still need it

[stone narwhal]

So i am starting making my first game in unreal, starting small with possibilities of multiplayer in the future, is multiplayer hard to do

[twin juniper]

multiplayer is easy, efficient multiplayer is where things get tricky

[grand kestrel]

Adding multiplayer later is a false concept a lot of new devs have, you need to build for it from the start

[twin juniper]

yea for sure

when making multiplayer you have to keep in mind of the 3 viewers. theres the server, the client, and then the remoteclient (other players). All three of these might have the same copy of an actor on their machine. everything runs in parallel. In the code things like if server/client/LocallyControlled then else are used to determine what code does what.

[stone narwhal]

@grand kestrel i just dont have much experience

[twin juniper]

http://cedric-neukirchen.net/Downloads/Compendium/UE4_Network_Compendium_by_Cedric_eXi_Neukirchen.pdf check this out, its an amazing read

[stone narwhal]

i dont wanna give up cause idk how to do multiplayer

i will soon, im working on level design

or at least ideas

[grand kestrel]

If you're inexperienced you will hit walls before you finish a game

And start over

Don't worry so much about your final product until you know you can make it

[stone narwhal]

im just starting with simple stuff and adding as i go

so making guns that shoot

then adding ammo reserves

then health

all that

[grand kestrel]

Guns that shoot are one of the most advanced things you can do in MP

x100 if its server authoritative

[stone narwhal]

then i probably wont do multiplayer

@grand kestrel what do you mean by server authoritative

[slender yarrow]

Box collision of a bullet isnt working on a dedicated server. I have it set to fire some events on component hit but nothings happening. You can even see the bullet going through every wall off into the void. Anyone experience this?

[harsh lodge]

How to forward port when game opens automatically for listen server through internet without manually configuring via router.

For coop multiplayer games we never configure port forwarding manually

Is there any option in ue4 to automatically forward port using third party plugin when game starts?

[thin stratus]

No

You would achieve this via NAT Punch Through

Which services like Steam do for you

If you don't use this, you need to either open ports by hand or implement your own

[harsh lodge]

Can u explain me more about NAT Punch through

[molten prism]

hello does any has suggested dedicated server management tool solution？

[real yacht]

@molten prism i have my own solution, so i think that depends what do you need

[wary wyvern]

Guys, What is the correct way to move character on server side?

AddLocalOffset isn't good, as it makes client side character look laggy

[olive pawn]

[HALP PLZ] im trying to work this stuff out aswell, its tricky for custom movement, i need somone to explain when all these fucntions are called and which ones i need and what to put in them :S

ive kinda got something working but theres issues that i dont know how to adress

my movement ability to grab a ledge works flawlessly in solo, and it works mechanicaly in multi, but sometimes in multi it wont grab the ledge or it will say it grabbed but falls down

im sure its got something to do with SetMoveFor() or something along those lines but i dont know how the system works at that level, its not clear in the docs

[real yacht]

i'm getting network error outdated client while my client is trying to joiin dedicated server

first time that i see this message, few builds earlier i didn't have that message

any suggestion?

[flint plaza]

Hi guys. I am hosting a session on a map in a standalone using Null online subsystem

and then joining via editor (tried standalone as well)

I reach the correct map

but the client pawn gets deleted

and get the error in output window of the above picture

can someone tell me what's wrong?

I get reset to 0,0,0 in world as well

[molten prism]

@real yacht can you share some ideas?

i think of making a web service

[rotund sapphire]

@wary wyvern, there is a whole bunch of networking implementation for Character class (in the char move component) that takes care of synchronizing your pawns. If you move your pawn on client side first (like for instance as a local player) then it will replicate this to the server automagically, you don't have to worry about that part actually. Unless you're trying to do something else here.

[real yacht]

@molten prism well, i jave created my ded.server manager in c# and nodejs. i have my manager in c# who can start dedicated server with specific commands, and i have nodejs server so i can communicate with my c# app and database

[flint plaza]

Can someone look at my situation? I didn't find the solution throughout this server and all of answerhub.

[real yacht]

try to set your player controller and not default player controller? you have your pawn, but do you use default player controller or you have your own? @flint plaza

[thin stratus]

You should def only try Standalone to Standalone

Or inside of one and the same Editor

Not any mix of that

[flint plaza]

I tried standalone to standalone

same result

I currently use default controller

[real yacht]

i had a same problem, but i forgot how i solved it

i think that maybe you didnt setup correct game mode, default game mode

something like that

[flint plaza]

No I have my own game mode

[thin stratus]

And that doesn't happen if oyu just press play with two players in PIE?

[flint plaza]

having my own empty playercontroller instead of the default PC also doesn't help

Happens in PIE mode too

for the client

[thin stratus]

Then your setup itself has an issue

[flint plaza]

How can I figure out what's wrong

I know for sure that the client has travelled to the correct map

because when I F8 and go to the place where the server is

[real yacht]

which game mode your map is using (where client arrive)

[flint plaza]

I can see the movements

It's called GM_Combat

[harsh lodge]

For using oculus platform SDK should the build be uploaded in the oculus developer dashboard?

[real yacht]

for distributing you game yes

[harsh lodge]

No for testimg

[real yacht]

but for testing, you just need to have oculus gear and sdk

[harsh lodge]

Using matchmaking

And rooms

[real yacht]

im not sure about that

[harsh lodge]

I just created an app in developer dashboard and copied the appid to use under online subsystem in default engine but it can't find any servers

[thin stratus]

I worked on a game a few months ago

But I think the client had that setup already

It was def working without the store

We were able to see created sessions in the web interface

[real yacht]

im calling this on client

what is the best way to replicate this rotation?

if im using rpc, that is using too much of bandwidth

and its getting laggy

[thin stratus]

An RPC should be totally fine

Why are you calling this on Turn and LookUp though?

[real yacht]

it's a mistake

just turn

with rpc

1vs1

i got this

i think this is very high number of rpc calls

and after x minuts, its become laggy

at the start everything is smooth

[thin stratus]

Well, I would do it like this:

Do it on Tick, cause you want to update it smoothly (and is has nothing to do with the Axis Events you are using).
Make an UNRELIABLE ServerRPC that passes a NetQuantized Vector (you can find that type if you look through the available varaible types).
Send the HITLOCATION of the trace via this.

That should be okay

[jolly siren]

Replicate less often and smooth more clientside if you want to use less bandwidth and can sacrifice accuracy

[thin stratus]

Yeah you could setup a Timer

And let that replicate the variable less often

And then just interpolate the current and new value

[jolly siren]

Exactly 😃

[real yacht]

that make a sense 😃

[molten prism]

@real yacht how about the memory cost for each dedicated server instance？is 180mb normal？

[real yacht]

i didnt measure still testing in team only with one instance

so i dont have that information

[rotund sapphire]

i think 180mbyte is very narrow. My 4x4 world uses 400-500mbyte. So it is content specific at the end.

[molten prism]

how many instances is suggested？Should we allow players create dedicated from our vps？

servers like PUBG seems cost lots of server resource

[real yacht]

well, it depends, but currently im reusing instance, if there is no players, everything is cleaned and waiting for new batch of players

and if is busy, instantiate new one

etc

[bitter oriole]

180MB is pretty low

@molten prism These are pretty broad questions. If your game requires dedicated servers then it's up to you to handle that infrastructure and spin up instances when it's needed

And shut them down once no one plays on them

How many instances per VPS is purely a function of your game requirements and your VPS capabilities

[molten prism]

yes i decide to do so

maybe i will let players host game from their machine using steamonlinesubsystem

and mix the servers

to the clients side

[bitter oriole]

In that case you won't need dedicated servers, yes

Daily reminder than your servers would need steamonlinesubsystem anyway

That doesn't depend on your hosting method at all

[molten prism]

i just worried about the ping on the servers from players does it lag for other players

[real yacht]

dude, first start coding, than solve problems 😄

[bitter oriole]

Ping might be slightly worse, but the bigger issue will be performance, and cheating

Performance = if the hosting player has 20fps, all game updates will run at that for all players

Cheating = hosting player can kick people etc

Generally this is fine if your multiplayer is about playing with friends

It's not fine for any sort of competitive game

[molten prism]

yes

[thin stratus]

Bug Fix: Role and RemoteRole now stay in sync on Server and Clients when changing Possession.

They didn't before?

[rotund sapphire]

Yeah they didn't really, i noticed such problem indeed. In 4.20 at least.

[thin stratus]

@lament cloak There is some steam stuff in the 2/3 of the page

Under Networking

No idea if it's about dedi servers though

haven't checked yet

Crash Fix: Steam Dedicated Servers no longer crash on LAN due to invalid account information. Servers now send out the correct Steam LAN account identifier. @lament cloak

Crash Fix: Trying to matchmake as a Steam Dedicated Server no longer causes a crash.

New: Added the “-SteamServerName” command-line option to enable developers or server hosting providers to set Steam dedicated server names/titles of up to 63 characters at application launch. The name will appear on the external server browser UI (and in some cases, in game). This also fixes an issue where servers running on a headless Steam instance (not logged into an account) would show up in server browsers as the dedicated server's numeric ID.
Example usage: -SteamServerName=”My Test Server”```

[jolly siren]

Does anyone have an example of a CMC driven ability such as melee that performs a lunge? I'm curious as to how people decouple the movement part of it from the rest of it (damage, sfx ,etc.). I'm talking about an event driven by a custom flag similar to jump, sprint, etc.

[thin stratus]

I don't have one for CMC, but my HoverComponent basically is a CMC.

[rotund sapphire]

erebel how about root motion animations? You can perhaps combine it with changing the capsule size either with crouch or manually.

[thin stratus]

What exactly is the question though?

I don't have a melee performing a lunge :D

[rotund sapphire]

eXi, you are missing out

everybody should have one in a life

[thin stratus]

I actually have no root motion at all anymore in the movement comp

But I guess RootMotion could work? If you use the animation itself to drive sfx and damage hit/overlap?

[rotund sapphire]

Yes with animation based approach, it comes with a useful timeline to implement such effects too

[jolly siren]

I'm hoping to see how people split a CMC oriented approach across character and CMC. Right now I'm using a custom CMC flag bWantsToMelee and setting this to true on input. Then I check for a change of that bool in PerformMovement and call StartMelee if it turns to true. I then call handleMelee within PerformMovement until the player has finished the lunge and applied damage. StopMelee applies the damage and plays the impact sfx.

The issue is that this damage and sfx gets replayed on corrections since I'm calling it from PerformMovement.

I want the movement part of the melee to get replayed correctly so I don't get any rubberbanding, but not the other aspects of it (dmg, sfx, etc).

But no, I'm not using root motion

My current approach is to check against bClientUpdating and not apply the dmg, play the sfx, etc. if it is true. But I think there is a better way to decouple the lunge from the rest of the melee.

[thin stratus]

That sounds okay too

That's what Epic suggest afaik

The bClientUpdating

They don't use it by default but they pass in if it's a replay or not

[jolly siren]

Okay cool, I'll give it some more thought and think about the best way to break this up

Thanks Cedric

[thin stratus]

I only do fx

and they should be played anyway

So I only do "bIsHoldingSprintKey"

They start sprinting

etc. etc.

Using a RepNotify bIsSprinting and a Delegate to implement the fx outside of the cmc

Which reminds me I'm probably only broadcasting in the onRep :x oops

[gleaming vector]

that dedicated server matchmaking crash is pretty

i wonder who tried it

[unique thunder]

If I use my client-controlled pawn, I can get access to the GameMode by going through some hoops, but I have an AI-controlled pawn that also needs to access the GameMode. How do I let him do it?

[winged badger]

his AIController is on server

so

you just access the GameMode

[unique thunder]

ah through that, gotcha

thanks

[winged badger]

unless you changed AIController replication settings, then you need to be careful about it

[night umbra]

Hey folks, I'm repeatedly running into a wall when writing multiplayer code, specifically with RPCs dropped even though all the documentation I've read (Unreal's replication documentation and the Compendium) suggest it should work. Specifically, I have a situation where an actor is owned by the correct pawn, which in turn is owned by the correct player controller, but ClientToServer RPCs are being dropped completely on that actor. At least, the ownership hierarchy APPEARS to be correct..

yup, a test just confirmed it's the local player pawn and the pawn's owner is the local playercontroller. Still drops the reliable ClientToServer rpcs on 4.20

[rotund sapphire]

You may have to call the SetOwner() specifically on that actor to make sure the pawn owns it. I usually do this when spawning something.

But maybe you can implement this in the pawn's logic to have a replication available for those child actors.

[night umbra]

does it not get applied correctly if the owner is set as one of the spawn parameters? The owner is set during spawn

But regardless the debug output shows the pawn as being the owner using GetOwner() to get the owner's display name

[rotund sapphire]

There is a SetOwner node, just call it after that spawn event and let's see it fixes it for you

[night umbra]

Ok I'll try setting it separately

the result is exactly the same

[rotund sapphire]

It's unusual, you must be overlooking something i think

[night umbra]

I think I figured it out. I thought the server was the one actually spawning the actors, but it turns out it wasn't. So the owners were being set as the server's version of the actor, when the local ones are actually different actors with the same name

there are some other things to work out with having the server spawn them but that works now at least

[thin stratus]

So I wasn't able to pass one ControlQuat FQuat to the Server, because getting the Rotation Around the Current Up (Trace Floor Normal) resulted in non-sense on surfaces with a Y!=0 Normal.
Now I pass the full ControlQuat and a ControlUpQuat, which only holds the rotation around the UpVector...

Probably not the best solution but well

[real yacht]

is it enough to destroy actor

it will not be replicated anymore?

[thin stratus]

Destroy it on the Server, yeah

[bitter oriole]

Hey Cedric, just a warning

I found FQuat RPCs to fail

I don't remember the issue but moving to FRotator magically fixed it

Just for the RPC

[thin stratus]

It's all fine here :x

The main issue I had was

void FQuat::ToSwingTwist(const FVector& InTwistAxis, FQuat& OutSwing, FQuat& OutTwist) const
{
    // Vector part projected onto twist axis
    FVector Projection = FVector::DotProduct(InTwistAxis, FVector(X, Y, Z)) * InTwistAxis;

    // Twist quaternion
    OutTwist = FQuat(Projection.X, Projection.Y, Projection.Z, W);

    // Singularity close to 180deg
    if(OutTwist.SizeSquared() == 0.0f)
    {
        OutTwist = FQuat::Identity;
    }
    else
    {
        OutTwist.Normalize();
    }

    // Set swing
    OutSwing = *this * OutTwist.Inverse();
}

That this was returning shite for OutTwist

But only in the scenario where the Quat in question was oriented on a wall and InTwistAxis was the wall normal with something Y!=0

Maybe I revisist it later again to see if I did something wrong

But now with the second quat that is just there to hold rotation around UpVector. All the rest works

So I can only blame this function

(But thanks, I'll keep it in mind @bitter oriole :P)

[bitter oriole]

Yeah I'm sure I had something deeper going on but well

[real yacht]

i have managed to optimize turret rotation from 30k rpc calls to 8k for whole session

i have send only z from net quantize vector

thnx @thin stratus

[thin stratus]

Cheers

[flint plaza]

Can someone answer my query I posted about yesterday? I am still stuck on it

no solution on google or elsewhere

[real yacht]

@thin stratus when im updating speed in game with powerUp, after XY time of gameplay i have jittering

but when i start game with for example 1200 speed, its okay

every time when speed is updated something happens

any idea what can be?

[thin stratus]

@real yacht Set the Speed in the OnRep

Not in the RPC

(The MaxWalkSpeed)

[real yacht]

the maxwalk speed

is component var

it cant be set on repnotify?

or i'm mistaking

?

[thin stratus]

CurrentSpeed is a RepNotify variable?

[real yacht]

yes

[thin stratus]

Sooooo?

[real yacht]

when i pickup, my speed is increased and it's okay, but after 5 pickups (that equals speed 1200) it start jittering

[thin stratus]

Buddy

[real yacht]

but when i start game with speed 1200

[thin stratus]

I just told you how to solve it :D

Use the OnRep to set the MaxWalkSpeed

It's not that difficult

[real yacht]

i know

but max walk speed is variable from character movment component

how can i set to be repnotify?

😄

[thin stratus]

Uff

The other Variable

Is set to RepNotify

Use that one

[real yacht]

which one, how can i see

which var is set on repnotify?

[thin stratus]

https://i.imgur.com/w37epxJ.png

[real yacht]

i know that, i was thinking that you are talking about some other var

[gleaming niche]

use the notify of that variable

to ALSO set maxspeed on the character

to the new maxspeed

so client and server are in sync

so jitter goes away

so your local client isn't running at slow speed

while server is running at faster speed

i assume that's the problem anyway.

[thin stratus]

Yeah it is

[real yacht]

yes it is

thnx guys

[thin stratus]

You'd think I told them the same thing but well

[bitter oriole]

BTW @thin stratus are you still having issues with MP movement component ?

[thin stratus]

Less

Right now it's a general issue with Quats

hehe

Replicated Movement is fine by now

[bitter oriole]

The game I'm making now has MP hovering vehicles too 😛

[thin stratus]

Gnah, rip

@bitter oriole I mean you can do almost everything the CMC does

And then just add your hover movement calculation for the Velocity

It's not THAT big of a deal

But still annoying

I basically have a CMC clone that has only two MovementModes, no RootMotion code and some additional code for the hover and floor normal logic.

[bitter oriole]

Yeah I went with a fully custom CMC too in the end

With shit phyics

[thin stratus]

Not using PhysiX at all

So not Simulated Physic stuff

Can't easily do that over the net

[bitter oriole]

Same

Just needs more work on my shitty physics simulation

[thin stratus]

Well I had a PID Controller at the Start

I started with Authority only

Then added the local client

And last added the simulated clients

The Authority version was working nice with the PID Controllers

But they caused too many errors if Client and Server had slightly different start values (position)

So my hover code is just one line

And my floor rotation is just a "Interp UpVector to new UpVector"

Works quite well

And makes it more likely to result in the same value for server and client

[bitter oriole]

How do you compute the ground normal ? Simple trace ?

[thin stratus]

Right now, a simple trace

But I need to change that

I had a SphereTrace

But that was picking up 90° edges

And the single trace is too.. well unbalanced?

I will most likely go back to x traces

And taking the average

Also felt nicer

[bitter oriole]

Basically my entire physics simulation is interpolating ground normal when altitude = 0 to vertical when altitude is >= constant

[thin stratus]

There sphere trace was finding these sides

Which is really shitty cause then it tries to rotate to that

Even if it's only for a frame or two

[bitter oriole]

I'm doing a trace at each corner of the object and averaging them, but the result can be unpredictable

Less than single trace

But only less so

[thin stratus]

// f(h) = Max(0, h * (g - f_max) / IDEAL_HEIGHT + f_max)
// 
// f(0) = MaxHoverAcceleration = 3000
// f(DesiredHoverHeight) = GravityStrength = 980
// 0 <= f(> DesiredHeight) < g
NewHoverAcceleration = FMath::Max(0.f, HoverInfo.DistanceToFloor * (GravityStrength - MaxHoverAcceleration) / DesiredHoverHeight + MaxHoverAcceleration);

Old code I just noticed

That's the function that makes up the hover acceleration atm

Pretty straight forward

[bitter oriole]

Yeah

I really need to find a way to basically compute a median ground normal

[thin stratus]

I had that

With 16 Traces

In a circle below the pawn

(can be less of course haha)

I took the Trace Hit

And used the direction towards the center of the pawn

And that 16 times

And then normalize it

That makes sure that the length of each trace is counted into the equations

So if you stand half on a block

And half not

You get moved off the block

Cause realistically the block generates more upmovement cause it's closed

That was one half of the stuff. The other was just adding the floor normals together and normalizing them iirc

It's somewhere in an old revision on perforce

[bitter oriole]

Problem is, even a median isn't an accurate representation

[thin stratus]

Correct, but you are only making a game

Not a simulation

Whatever feels the best

Is good

[bitter oriole]

It doesn't feel that good for now, so I'm still looking at a better surface detection

[thin stratus]

Hm it was feeling good for us. Maybe a different vehicle?

I mean we have this drone

That is round already

[bitter oriole]

I think part of my problem is ground clutter that I'd like to keep 😛

[thin stratus]

Could be(?)

I would suggest getting that feeling right offline

And then stepping into replicating that

Otherwise yo uare adjusting ServerMove etc.

And SavedMove the hwole time

with new info

[bitter oriole]

I already have a working version with saved moves & rep, and it's resilient to minor difference in simulation so I can change the simulation code without affecting MP already

(making it not actually a #multiplayer issue, I guess)

[ruby meteor]

How costly is spawning a replicated actor bandwith-wise? I am spawning around 50-200 per second, stat Net displays only 3 KB/s and it works fine with a simulate PktLag of 40ms, so is it acceptable or will it lead to issues in online play?

[bitter oriole]

Spawning a replicated actor isn't costly in particular, no

Though it seems a weird process you have here

[jolly siren]

It depends on the actor. How many replicated properties it has, etc.

What is it you are spawning?

[ruby meteor]

Bullets/Lasers mostly

They have only 2 replicated bytes, so its not a lot data per actor

how costly is an actor without any replicated property? It needs to replicate location, rotation and scale, so 3 vector of 3*32bit each, so 12 byte per actor?

[knotty frost]

don't forget the compression going on under the hood for replicated vectors, rotators

[chrome bay]

50-200 per-second? RIP I would say

Spawning that many actors that quickly even outside of multiplayer is probably ill advised anyway tbh

[jolly siren]

Most of the time you would write a pooling system for that

[chrome bay]

^

[jolly siren]

http://www.gameprogrammingpatterns.com/object-pool.html

That will help with the network side as well

Depending on how many you really need live at a time

[thin stratus]

50 to 200 actors per second, on 60 fps means 0.8 to 3.33 actors per frame

That's actually fine depending on the actor

Just to counter the "Spawning that many actors that quickly even outside of multiplayer is probably ill advised anyway tbh"

[chrome bay]

Yeah it's probably doable for sure, I'd just avoid it in the long run 😛

[thin stratus]

Yeah haha

[chrome bay]

But I'm a self-diagnosed premature optimizer

[thin stratus]

Our prefab system does that

While limiting it via delta seconds

To not cause too much lag

[knotty frost]

i don't know if this was/still is the case, but awhile back I read somewhere Squad uses replicated actors for projectiles? it seemed like it would be too expensive, curious if that is the case

[chrome bay]

we do to in HLL but we just don't have that many projectiles

[thin stratus]

@chrome bay Do you maybe have an idea how to limit a quaternion to an angle?

[chrome bay]

I imagine squad is probably the same

Hmm convert to rotation around axis and clamp maybe?

Quats are not my strongpoint 😄

[knotty frost]

we have been debating the issue for Escalation 1985 back and fourth, traces vs projectile actors

[chrome bay]

@knotty frost you can do travel-time with tracers too

don't necessarily need a physical actor to represent them if it's simple

[thin stratus]

Yeah idk, I have the Pawn's Quat and a ControlQuat. They have their forwardvector in the same plane.
The angle between them is basically the "Pitch" of the camera and should be limited to e.g. -45 to 45.
Now since we have no fixed up vector, Rotator's Pitch kinda doesn't work for this.

They also don't share any relative rotation to each other.
Both use the same ControlQuat. Just that the Pawn only accesses the RightVector of it.

Welp, tomorrow it is

[chrome bay]

lol story of my life 😄

[celest hatch]

Hey guys will this course help me make my rpg multiplayer? https://www.udemy.com/unrealengine-cpp/

or do i need to look for something else?

[north swan]

Hi guys. I'm currently working on a simple reconnect feature. Every player(controller) controls a pawn.
I overrode "PawnLeavingGame()" in the playercontroller to NOT destroy the pawn upon disconnecting.
Now when I reconnect and want to Possess() the Pawn (I saved its pointer on the server) the (dedicated) server crashes. This is the error:

Is that a nullptr? curiously enough, I do check for "nullptr" and it seems that it isn't?!

maybe someone has an example of a working reconnect and repossess feature?

[jolly siren]

If you show your code it will be easier to help

[north swan]

ok gimme a sec

this is called from PawnLeavingGame() before Unpossess();

i'm saving some info about players in a struct where everyone has a (i assume) unique network address

(at least it seems to detect a REconnection)

this is what i do on reconnect

curiously enough it says that it's NOT null

but it crashes when I try to possess the pawn

btw if you have any other code critique, lemme have i

t

[jolly siren]

it says playerController is not null?

[north swan]

is says playerCameraPawn is not null

[jolly siren]

playerController is what is null and is causing the crash tho

[north swan]

oh lemme check

compiling now. PC being null would be weird, since I call "OnPlayerReconnect" from PostLogin in the GameMode

also the line "playerController->GetPlayerNetworkAddress()" works

[jolly siren]

true

[north swan]

yeah PC is not null

this is my override of PawnLeavingGame()

[night jay]

So I'm looking at epic onlinr services, specifically metrics system. Is it possible to store session data using that or is it purely to track sesdiond themselves

[meager spade]

@north swan is that a override?

of a base class?

base function*

if so, your missing a super call

[north swan]

oh yeah, whoopsie

let's see if it makes any difference, ty

[meager spade]

also no need to call unpossess

pawn should be unpossessed at that point

{
    if (GetPawn() != NULL)
    {
        GetPawn()->Destroy();
        SetPawn(NULL);
    }
}```

the base class destroys the pawn

[north swan]

yeah but I don't want to destroy the pawn

[meager spade]

ah

[north swan]

i wanna keep it in case the palyer reconnects

player*

[meager spade]

ah ok

then yeah ignore the super call

[north swan]

gotcha

[meager spade]

cause it will get destroyed

but you do want to set Pawn to null

if its valid

and like i said Unpossess should not be called at that point

even though i doubt it will hurt

[north swan]

ok I'll apply that and try, thanks for your time btw

welp, still crashing when I try to possess the pawn. I guess I'm missing something essential

[meager spade]

when you possess the pawn

after leaving?

[north swan]

yes, I reconnect (after leaving once) and the server crashes

when trying to access the pawn

[meager spade]

show me the crash log

and callstack

[meager spade]

whats line 772?

mine is if (!HasAuthority())

but im on older version of ue

[north swan]

cant find the crashlog for the dedicated server

[celest hatch]

Where could I get a tutorial that teaches how to make an rpg multiplayer?

[north swan]

I'll check line 772

[worthy wasp]

"No owning connection for actor - server RPC wont be called"

How do you properly call off an event on an actor you dont own (think of interracting with some object in the world - you need it ot replicate to all other players)? The actor is a statically placed object in the world map

I thought that you would run a local function on the interracted actor, which calls a server RPC event - but i'm getting this error above when i do so.

[meager spade]

well the object needs to be owned by something

with a connection (ie playercontroller)

if its placed on level, it should be owned by the server

[worthy wasp]

thats cool & all - but how do you own something that is statically placed in the world?

right so...

what would be a proper chain of events to interact with it and have that interraction be replicated?

[meager spade]

so it wont need to do a rpc call as the server owns it

hmm

these are not spawned but pre-placed right?

and its set to replicates?

[north swan]

that's line 772 in the PC

[worthy wasp]

when i do that and test - its only on the local client that interracted with it

all other clients see it still unchanged

and yes - pre-placed..... actor class is set to replicate.true

[meager spade]

you need to clear the controller

from the pawn

when its being removed

the old pawn still has a pointer to a controller

which is now not really valid i assume

but its not null

[worthy wasp]

@meager spade - see above?

[winged badger]

@worthy wasp if you want to send a Server RPC from inside an Actor from the Package

you should call SetOwner on PlayerController of the player doing the interacting

imo, a bad way to go about it

[jolly siren]

Has anyone written any prediction code for a melee lunge? I'm working on a melee that shouldn't attempt to lunge if it is going to miss (because of collision, the target moving, etc.)

I have went through a few different options for the lunge itself. SetActorLocation with sweep, velocity, teleportto, etc. I guess I should run a simulation right before running the actual melee to see if we reach the target.

[north swan]

does anyone have a working example of a reconnection to a server with repossession of old pawns? it's driving me nuts. and @meager spade , unfortunately clearing the controller of the pawn (with SetOwner()) didn't help

and it's so weird that
if (playerCameraPawn == nullptr)
equals FALSE but as soon as I call ANY function on playerCameraPawn, it crashes with an access violation

[winged badger]

that happens only when another thread is involved

did you try to step through it? check the UObject flags and how the Object looks in Locals?

[north swan]

oh, I think I've never done that before

what do you mean by checking the uobject flags or locals? sorry if it's a dumb question

[winged badger]

when the thing crashes, when run from VisualStudio

it will hit a breakpoint

which gives you a snapshot of what was going on just before it crashed, as well as additional one for each step backwards in the callstack

if you can't reproduce the crash in editor, i suggest you override the Possess function with exact copy of itself in your custom PC class, cook the project for DebugGame and then just open it in VisualStudio and press F5

[north swan]

okay its just what UKaosSpectrum said. the pawn is still possessed by a PC that is not valid. but how would I get rid of that?

controller doesn't seem to be valid

(this is in PC->Possess)

oh, I'll just try "playerCameraPawn->Controller = nullptr;", haha