multiplayer

[bitter oriole]

That's not really true - Blueprint is slower, but it's going to be slower by parts of a millisecond at worst, unless you're trying to find new decimals of Pi

[ocean arrow]

Thank you for answering my questions btw. I understand you are probably very busy.

[bitter oriole]

I would still advise C++ for anything non-trivial that needs many changes over time, because source control. I've done like 100 tweaks to my network movement code because it took that to feel right

[ocean arrow]

Oh my that sounds brutal.

Have you played smash bros?

I wonder how difficult it would really be to netcode that type of game.

If there are any you know that would not mind answering my noob questions I would be most grateful. Your advice thus far has been valuable indeed.

[bitter oriole]

Depends a bit on the specifics. For a 2D gameplay that has non-physical movement and quick responses, I would implement my own movement component - not using UE4's built-in character system that has everything working out of the box

The fundamentals of that are outlined in the karting part of the tutorial

But you could start playing with UE4's character and get some results easily

Overall it's reasonable

A smash type game is a very resonable scope in terms of code and art

[ocean arrow]

I indeed have to make a movement system entirely from scratch. The feel of that movement system is paramount to the game's success. What moves do you think would be the most difficult to get working online?

I would guess that something like Shiek's whip would be about the most difficult move.

https://gfycat.com/artisticunlawfulibis

She can move a chain around in any direction if you are not familiar.

I assume A attacks as they are know (the basic punches and kicks of the game) would generally be the same code.

known*

[bitter oriole]

Is it like press A + direction, or like keeping A pressed for a few seconds while moving ?

Basically single action events are easy to handle, no matter if it's 4 buttons to press at the same time with a direction parameter, or just A

You decide locally what action is triggered, and then send something to the server like "Use cut attack", or "use whip attack in direction {A, B}"

What's hard in multiplayer is fluid, constant movement, like player movement

[ocean arrow]

For A attacks its like a single press + direction

For that B attack (the special moves of the game) you hold B and then your arms moves around with your right stick

And the chain whips around free form like above

[bitter oriole]

Then it's slightly harder, because you need to send the position constantly - and networks being networks, other devices receive your constant stream at a very irregular rate, like 5 updates in a single frame and then no update for three frames

This is why movement is the hard part

It needs a system to keep objects moving even when you are not receiving data anymore

The Udemy course does talk about that 😉

[ocean arrow]

Hey 😃

So if I follow the course, I have a good chance of fighting my way through most of what I come across?

How proficient should I be in C++ before I take the course?

[bitter oriole]

Yeah. None of what you talked about was impossible or particularly hard, though it's probably still weeks of learning & work

If you've never looked at C++ before I would look at a basic tutorial on C++ first, then play a bit with Blueprint to understand how Unreal works, then look at UE4 C++

[ocean arrow]

So you are saying getting this:

https://youtu.be/uG8eAWuxgYc?t=101

speed and all

is about how difficult out of 10 in terms of netcoding?

if you had to guess

Is speed a major hard part?

[bitter oriole]

The difficulty is constant, it's just going to work less and less well the faster it goes. In the best conditions, you're still looking at multiple frames of lag between action on client and handling of that action on the server, and that's just physics here - you can't make a game as fast-paced as if it was local multiplayer.

At some point it's going to be a decision on how many players will have the network conditions to make it possible.

[ocean arrow]

My plan was to make it about local multiplayer if you want the "real" experience and online play is just as fast as I can get it. No input lag to compromise.

Smash Ultimate and Icons Battle arena, both have input lag to make local play feel more consistant with online play

It however sacrifices local play and the game altogether by feeling sluggish.

See any misguided foolery in my assessment?

[bitter oriole]

I would simply say to prototype your game - learning a great deal along the way, and then try it before doing any art of levels etc, to confirm that it does play well.

At that point you'll be able to decide if it's cool, or if your vision isn't going to work out

[ocean arrow]

Well, Smash Bros Ultimate is coded in UE4 and has netplay so I know its possible and works out.

I just wonder how likely I may be able to aspire to do it.

[bitter oriole]

(it's not)

[ocean arrow]

Its not likely I will be able?

[bitter oriole]

It's not UE4

But to answer your question, there's no reason you can't do something Smash-like in terms of gameplay.

[ocean arrow]

Very well. Training begins tomorrow.

I am off to go add a dollar to my card

Thank you for the advice.

[bitter oriole]

Good luck !

[unique thunder]

I have a vehicle BP actor set down in my level that runs some logic on beginplay but I see warnings that he has no owning connection and there might be issues with the functions he's triggering, what is the correct approach to this? Set server as owner?

[bitter oriole]

No owning connection = you're trying to call RPCs that are not allowed

For example if you have a vehicle that calls server methods from a client, without being owned by the player controller on this client

That's only allowed from the owning client

[meager spade]

input lag is a big no-no, why have input lag when you can use prediction

i would hate to player overwatch and have input lag :/

same as fortnite

[bitter oriole]

It sucks, but it's pretty common as a basic strategy because it's consistent

[unique thunder]

@bitter oriole So how would I have an instance of a replicated actor call an RPC? It spawns and attaches a few things, etc. When the server boots up, there technically isn't even a player in it yet and I don't want to assign a random owner before this logic can occur

Is a dedicated server not allowed to be an owning connection?

Weird thing is, the RPC does work and everything the chain does I can see has happened when I find the vehicle. Warnings persist

[bitter oriole]

What you can always do is call functions locally on the server for any actor

If that's what you're doing it shouldn't warn

"No owning actor" on a vehicle is typical of calling RPCs on a vehicle with no PlayerController

[unique thunder]

One sec let me check my set-up again

This server RPC is triggered on event beginplay

Which goes on to spawn / attach actors etc.

Since this vehicle actor is replicated, if I run the same chain but without an RPC

Would it just run on server and not need an owning connection?

And still work?

[bitter oriole]

Stuff like creating components should run only on the server

Since they'll be replicated

Creating new components of a replicated actor at runtime is messy

The correct process is to mark all of the new components as replicated, and only create them on server

[knotty sequoia]

Stranger, you got any idea why my Find Advanced Sessions peice is failing to find any sessions, even when i know they exist!?

[bitter oriole]

Hard to say with zero info

[knotty sequoia]

it was discussed above the convo you had here

essentially, i have done everything yet it still will not work

[unique thunder]

@knotty sequoia Anything in the output log on attempt?

I haven't used advanced sessions but I'm hoping it has error outputs

If not in BP, at least in output log

[knotty sequoia]

nope

nope

[glacial pollen]

@knotty sequoia if you are using the play button in editor, make sure you don't have *auto connect clients" enabled

Advanced sessions will NOT list a session you are already connected to

[knotty sequoia]

mhm

[unique thunder]

do any of you guys have experience creating dynamic mat instances at runtime in multiplayer clientside?

[bitter oriole]

@knotty sequoia I can't look at the whole conversation, but if you're using Steam, running from packaged, development builds, it should basically just work

[knotty sequoia]

well i have a development in the situation

[bitter oriole]

Try disabling Steam and running two local builds with the null OSS

[knotty sequoia]

it works on my Laptop and Desktop here

but my friend running the same client cannot see any servers, public or mine

https://cdn.discordapp.com/attachments/532615171118596117/535117458089050127/ToNRP-backup-2019.01.16-15.20.56.log

friend is getting a crap ton of steam errors now

ones i dont get on two different machines with different steam accounts

[bitter oriole]

That's pretty interesting.

[knotty sequoia]

indeed

[bitter oriole]

If you have more friends, be sure to try

Check that your friend's Steam is up to date

[glacial pollen]

With a dedicated server and 1 client. Why would I have two instances of a widget?

Scrn_techlab
And
Techlab_c0

So scrn_techlab is the widget in another widget (variable name)

And techlab_c0 is the actual widget

However, code is running in scrn_techlab as client

And techlab_c0 never gets the variable I'm trying to send

[lean river]

Anybody here played with fast array replication?
Ue4 doesnt do this automatically with array of struçt?

[twin juniper]

UGameInstance::NetworkError() fires right before disconnecting the player from the server. So I can't use this to do UMG widgets which tell the player why they were disconnected.

Any ideas?

[sly kernel]

what are the biggest differences between making split screen multiplayer and online multiplayer game using Blueprints ?

[limpid comet]

Hey everyone. I have a friend that's working on a project and he's having an issue where we can't get two players (locally) to work in the game. It always seems to be receiving just one input or the other with everything we've tried so far. There also might be other stuff involved in the blueprints that might be getting in the way, so if anyone would want to help through a private call I believe that would be the best way to help, which we'd be very thankful for! Otherwise, any other kind of help or advice about this would be very appreciated!

[lament kettle]

@limpid comet there's plenty of official ue4 Tut's on YT that cover your issue.

[limpid comet]

I have tried to look through a few of them so far, and unfortunately the way they are handling multiplayer happens to screw up with how the camera is handled in the project, so from the one's I've looked through so far they don't work in this situation. I am going to keep looking through them but we have been doing this through all of last night without any success

[lament kettle]

Honestly making two characters work on a local scene is.... Very straight forward.

[sly kernel]

Lemme try it the way other folks ask questions

[lament kettle]

I'm not certain anyone here can help with this type of issue.

[sly kernel]

My friend is trying to make multiplayer game and wondering what are the biggest differences between making split screen multiplayer and online multiplayer game using Blueprints ?

[lament kettle]

Split screen is basically two cameras projected into the screen.

Do you mean two players sitting beside each other on one machine?

[unique thunder]

Why does this not work in multiplayer?

[limpid comet]

Yes, Doom

It's using one camera and isn't splitscreen

It's a fighting game that is like how Smash bros is

[sly kernel]

@lament kettle yeah, 2 or 3 or 4 players (2 or 3 or 4 gamepads) play on the same PC (or rather console) with one monitor / TV and screen is split into 2/3/4 screens.

[lament kettle]

@limpid comet https://answers.unrealengine.com/questions/240300/how-do-i-create-a-split-screen-game.html

[limpid comet]

I've followed that

Doesn't work and breaks the camera

The camera relies on both players being in the scene at the start. Spawning one in breaks that connection

[sly kernel]

@limpid comet https://www.youtube.com/watch?v=VATImPiTj1g

btw, are there any performance issues when running split screen game? I figured there gotta be some screen instancing in UE4 for that

[lament kettle]

Yes there is.

[sly kernel]

so it should be no difference, performance wise, with conventional online MP game ?

[lament kettle]

That is correct. But with mp there will be delay.

[limpid comet]

In that tutorial they are also using the same way to spawn players in and assigning them to player controller IDs

Is there any way to do that without spawning them in?

[sly kernel]

not that I am aware of @limpid comet

if you have several players, you gotta have several player controllers

[limpid comet]

Ahh, alright. This is more complicated than I thought it was going to be. I'll try to figure out how to change the camera part then

Thank you for the help!

[sly kernel]

@lament kettle what about replication and all that "nice" stuff that has to be done for online MP? Does it also apply to split screen MP ?

[lament kettle]

As I said earlier. There will be a drop in performance the more cameras. How much depends on implemention and what's shown. in multiplayer there will be a much more significant drop, which again depends on how you've implemented your game.

You can easily test this out.

Keep in mind. Local multiplayer will be much more forgiving for responsiveness in terms of latency.

[sly kernel]

what I am wondering about is by how much performance drops.. If it's instanced rendering, it should draw all 4 screens in the same pass

[lament kettle]

I don't have experience with that.

[sly kernel]

aye, np

[modern dome]

How do I declare Replication notification functions?

    UPROPERTY(EditAnywhere, Category = "ARPG|Game", ReplicatedUsing=OnRep_IsRingMenuOpen)
        bool IsRingMenuOpen;

        void OnRep_IsRingMenuOpen();

void AARPGMapStateBase::OnRep_IsRingMenuOpen() {

}


void AARPGMapStateBase::GetLifetimeReplicatedProps(TArray< FLifetimeProperty > & OutLifetimeProps) const
{
    Super::GetLifetimeReplicatedProps(OutLifetimeProps);
    DOREPLIFETIME(AARPGMapStateBase, IsRingMenuOpen);
}

LogCompile: Error: Replication notification function OnRep_IsRingMenuOpen not found

[stuck axle]

UFUNCTION()
RepFunction();

UPROPERTY(ReplicatedUsing = RepFunction)
type var;

@modern dome

you have to use UFUNCTION() 😉

[modern dome]

Ah. Thank you :)

[near knoll]

does anyone knows what this warning means ?
this is in a dedicated server built by ue4
It's a door i'm trying to open but it doesn't wanna open and when i'm destroying it it's gone but on the client still exist

[worthy perch]

Does the door replicate?

[near knoll]

it's replicated actor yes but it's set via construction script

the weird thing is that is working fine on the editor when u check a dedicated server option ,, but when building a dedicated server this problem happens

[worthy perch]

Perhaps test with not spawning the door in the construction script.

[near knoll]

when i run the editor play on the dedicated server it's fine tho

that means construction script is working fine

but building the server causes the problem

[worthy perch]

It's just to confirm that the construction script is working fine. If it's easy to test.

[near knoll]

how how to make sure that the construction script is fine on the dedicated server when building

[worthy perch]

I don't know about that, sorry. Perhaps just general logging.

[modern dome]

If I want to do something on the GameState (on the server), I need to call a ServerRPC from the PlayerController first, right?

i.e.
PC (Client) -> ServerRPC -> PC (Server) -> GameState (Server)

since GameState isnt owned by the Client.

[worthy perch]

Yeah.

[glacial pollen]

Why would I have two widgets when using a dedicated server?

I call a function from the client side of the controller, but it appears to run the "servers" copy (which shouldn't exist)

So when I run another function from a button press, it calls the correct widget.

[lament kettle]

Use can run cosmetics when you create the widget

And then figure out where your making a server call

[hard lance]

Does anyone know how I can get the Gamemode to subscribe to an event dispatcher on all client players?

[lament kettle]

You mean like a client publishes to a game mode event?

@hard lance

[hard lance]

I'm trying to have the game mode subscribe to an event dispatch on the players. So when a client executes the event it triggers logic in the game mode

But the more I learn and think about it I simply can't do that since the remote client won't be communicating to the server that the event has triggered

Without a client to server call

[glacial pollen]

Route it through the the player controller

Bind to even on PC client side

Call another even PC server side

That call will call the GM

[cedar finch]

What's a good way for giving points to players when shooting enemies? I tried using an interface so the enemy would tell the player how many points the players would recieve but it didn't work out like intended. I need quick responsive points such as +10 for every bullet hit and your spraying full auto into enemies. Should I just run a check in the linetrace for what was hit and give points there? Maybe that would speed up the process and work?

[hard lance]

@glacial pollen Thanks.I'll give that a try

[autumn dawn]

Question, is there a tutorial on how to add voice chat to a project?

[harsh lodge]

hello

Can someone help me with replication of textures loaded dynamically at runtime from local storage on server

I'm using Rama's Victory BP to Load Texture from file

But i need to replicate the veriable from server to clients.

[fringe dove]

are servers limited in how long they can run? I'm trying to have a long-lived server for VR with a 90hz tick rate, it seems tick may run out of precision after around 25 hours ( (2**23)/90 = 25.8907654 hours before it can't represent a tick step if time is accumulated in a float

[fossil spoke]

I doubt that is even an issue.

Ive seen dedicated servers run consistently for days on end.

[fringe dove]

I'm getting some errors joining a server t hat has been running long, get stuck on waiting to start match even though match is already long since started, but haven't tracked it down to that for sure

I did see one answerhub post that mentioned it

seems to default to 30, so that wouldn't run out of precision for a little over 3 days instead

I've definitely connected after 25 hours without problems, but just saw the stuck joining match thing today ( one of my test had seen it in the past after server had been up for a while, but I'm not sure how long)

https://answers.unrealengine.com/questions/440864/connections-are-immediately-saturated-on-long-runn.html

seems that at faster tick rates error accumulation in some areas may accelerate too, and not just be about not being able to represent a tick quantum

[fossil spoke]

Mmm its odd that they wouldn't have foreseen this and accounted for it.

[fringe dove]

I don't think they've ever made anything with long running servers

some console cert stuff I think requires things to keep working ok after several days though, for single player stuff

[glacial pollen]

You'd need to create an overflow system. So like when Rick is maxed, you have to reset it, and have a separate tick called days. But then, what if someone wants their server to run for years? (I'm talking out the ass here, just thinking)

[fossil spoke]

Well thats what i thought they would have ensured that this wouldnt ever be an issue. But i guess not.

[glacial pollen]

It's not that bad if you restart the server every 3 days, but then you have to build a save system

[fringe dove]

yeah you'd have to have server migration

and saving/serialization to support that

3 days would be about 1.5 restarts experienced by players every 100 1-hour play sessions

for mine at 90hz, assuming 25hrs is the limit which I'm not 100% positive on, thats 1 in 25 player sessions that experience a restart

[glacial pollen]

If you ran two servers during the transition

You could reroute players to the new server if they wouldn't have enough time to play a full session on the old server instance

Messy though

[fringe dove]

yeah, I may do that, or degrade to 60 hz and tell people to move

I'm doing a kind of persistent hub area and with a VR thing it probably won't have a lot of users

so I really wanted to just have one if possible, unless things take off

[kind wave]

So when I play in editor window with 2 players, my Authority takes on the remote role of Simulated proxy, but when I host the game through a listen server, the authoritys' remote role is an autonomous proxy?

I'm pretty new to networking, am I doing something wrong here?

[plush wave]

How does one detect (server side) when a player improperly disconnects (i.e. a timeout from connection being severed)?

[kind wave]

Is there away to force set the server hosts remote role to simulated proxy so I don’t get this disconnect between the play in editor window and a packaged game?

[thin stratus]

You don't play with the Editor Build and a Packaged Build.

Either only Packaged or within the same Editor.

@plush wave Not sure if that is actually tracked.

It should be though, why would you need to know it?

Simple message somewhere?

[plush wave]

I want to have a "player left" vs "player timed out" notif

[thin stratus]

I figured. Hm.

I know it exists the other way round

So that the Client knows why they disconnected

[plush wave]

Right

But why wouldn't the server know?

In my head, the server should know more about the connections than the client

"I haven't heard from Player X in 30 seconds, I'm moving him to inactive state BECAUSE of that"

Haven't seen anything like that in the engine code yet

But I thought UE4 had a player timeout function

I know UE4 games (like ark) have this

[thin stratus]

Yeah I'm just not aware of where it's located

You might want to try something simple: Let the Client time out. Check the Server Log. And find where that log happens in the Source.

From there you might find a simple call to some known class

It's probably very simple :P

[plush wave]

Yeah it may be simple

Just hard to find, like you said

Surprised such a network case isn't documented

[bitter oriole]

@plush wave Fun question : why would you want to know if the disconnection was improper ?

[plush wave]

It's an RTS game. If the player leaves willingly, I want to destroy all his stuff. If he is improperly disconnected, I want to hold on to his stuff (maybe even have an AI manage it for him/her for a bit) and give him a chance to regain his work.

Just did a test. Left a server normally and force quit a client. Call stacks are identical on server....

very discouraging

[thin stratus]

Well, that can be done through a simple button though

You can't differ between willing ALT+F4 anyway

So as long as the player is not going through your menus, it won't be "willing" anyway

So you hook it up to a button press

If I click "Leave Server", you can post the message

If not ,post that I timed out

[plush wave]

True

Could definitely take that route

Thanks

Just shocked that the server doesn't know how a client disconnected

[bitter oriole]

@plush wave The problem is, disconnecting cleanly or not is very hard to differenciate

In particular, you can't prove that someone disconnected voluntarily or not

If leaving the game by unplugging your Ethernet cable results in griefing the opponent, for example, it's going to be exploited

[plush wave]

Not sure I understand how improperly disconnecting yourself would grief your opponent

[bitter oriole]

I don't know anything about your game, but what i'm saying is, make sure unplugging your network does not result in negative outcomes for other players, compared to cleanly leaving

Basically avoid gameplay changes based on how players disconnect

Unless it doesn't have matchmaking and is played only with friends 😃

[meager spade]

i can add to that about Call of duty, in Zombie mode, if you pulled the ethernet out or force quit the game (on console), it would not use any of your consumables, so is technically an exploit 😄

[plush wave]

Hmm gotcha. The intent was not to give players an unfair advantage, but to give players with a poor internet the chance to reconnect

But point taken. Devs gotta plan for fair use in all senarios

[bitter oriole]

The intent is clearly good - just make sure it can't be gamed.

Two strategies I've seen for competitive games have been :

• Let it be (you're out of the game, voluntary or not, outcome of the game affects your ranking whether you were there or not) like Destiny does
• Give the option to be nice (pause the game on disconnect, offer the option to resume to everyone after a few seconds) like Starcraft does

Obviously if unplugging your network or cutting power to your machine let you annoy another player or prevent a loss to be counted agaisnt you - people will absolutely do it

[plush wave]

Right but I guess you have to make the "Exit button action" reliable

Don't want someone leaving the game normally and then pausing everyone to "wait for them to reconnect"

[bitter oriole]

In that case, the exit button would notify the server, wait for an ACK, and then actually exit

[twin juniper]

Hi everyone
I got a question about setting up the multiplayer in Unreal. I;m at uni and for a group project we have to create a game with multiplayer. We are art students and got no programmers in our class so I used video tutorial on Youtube to create multiplayer (link will be included below). But at the end I ran out into a problem.
My multiplayer works fine for Lobby map, all the players can connect and they work fine. But when I start the game and it transfers into the actual map none of the controllers work. You can see just a camera under the floor and thats it. Please help
Youtube link: https://www.youtube.com/watch?v=abmzWUWxy1U&list=PLZlv_N0_O1gYqSlbGQVKsRg6fpxWndZqZ

[sudden stream]

Make sure that when your actual map (lets call it "Arena1") begins, each connected player controller possesses a pawn that is either already in the map or spawned by the server

otherwise they may end up simply spawning as a spectator at the map origin

[plain flume]

So are you guys excited about todays Networking in UE4: Server Optimizations stream?

[sudden stream]

Yes! 😃

[twin juniper]

@sudden stream thank you for your reply
Well all the players select characters in Lobby map and when the game starts it should take the location of existing PlayerStarts and spawn players there

[sudden stream]

Which object/blueprint do these graphs reside in?

Ah, I assume the top image is in the PlayerController

[twin juniper]

@sudden stream yes, top one is player controller and bottom one is GameMode

And both Lobby and Map they got each player controller (PC) and Game Mode (GM), so I got LobbyPC/LobbyGM and MapPC/MapGM

[worthy perch]

Do the player characters Replicate?

[twin juniper]

@worthy perch yes. I mean they work fine in the Lobby but in the Map it doesnt work

and it uses the same characters

[worthy perch]

Can you check if the cast to GameplayGM succeeds?

[sudden stream]

@twin juniper Add some debug output (Print) to check your references along the excecution path.

[twin juniper]

@worthy perch
Tried this but didnt print anything at all. Maybe i did something wrong?

[sudden stream]

might be worth throwing a few "isValid" checks in for critical paths

[worthy perch]

None of them printed?

[twin juniper]

@sudden stream it might be silly question but how do I add them?

@worthy perch No. none

[sudden stream]

search for "IsValid" when adding a new node

there are 2 flavours

[worthy perch]

Perhaps restart the editor.

[sudden stream]

a macro and a pure function

if no print output is showing after your last screenshot, that suggests your RPC (PassCharacterInfoToServer) isnt being called, or at least isn't making it to the server.

[twin juniper]

@worthy perch I tried to restart but it didnt work

[sudden stream]

put one in just before that call on the client side to check your execution is at least making it up to that point.

[twin juniper]

@sudden stream
I tried to add all these PrintStrings but none of them being printed either

[worthy perch]

Are you sure the PC class is being used for the map?

[twin juniper]

@worthy perch
Thats what I've got there

Thats for my main Map level

[worthy perch]

Hmm... I'm not really sure what could be the problem then.

This is on a dedicated server or listen server?

[twin juniper]

@worthy perch What do you mean by that?

[worthy perch]

When you hit the drop down arrow next to the play button, what settings do you use?

Particularly "number of players" and if Dedicated Server is checked.

[twin juniper]

@worthy perch It was unchecked. I Checked it but it still didnt work

[worthy perch]

So, BeginPlay isn't being called on your Player Controllers?

I don't really know how to fix that problem. I did hear of similar stuff recently, but I don't know if a fix was ever discovered.

But, I think you should make sure that the PC class is actually the one you specified.

[sudden stream]

Expand the dropdown on the PrintString node(s) and double-check that "Print to screen" is true

[twin juniper]

@sudden stream yeah they are all checked. I even added one PrintString after EventBeginPlay but its not printed either. So seems like my EventBeginPlay is not being called

[sudden stream]

that or your PIE session is not using your custom player controller

[twin juniper]

@worthy perch I checked everywhere and it uses the right one

@sudden stream how can i fix that?

[sudden stream]

check the world settings for both maps, your lobby AND your main level

make sure the settings are what you expect to see

And as @worthy perch suggested, double-check that the PC class you've selected in the world settings dropdown is in fact the one you're editing.

[twin juniper]

@sudden stream yes I checked and its the right one

[sudden stream]

Then I'm stumped...

How about BeginPlay in the GM?

(Try a PrintString in there to confirm that the GameMode is actually being used)

[plain flume]

I really hope we would get more tutorials /documents about NetGraph

[fringe dove]

networking livestream going on: https://www.youtube.com/watch?v=ASKW9dduFhU

though ironically it just got disconnected and is having networking issues

apparently other people in the chat are running into the same long-running server time precision issues we were talking about in here last night, someone making an MMO

stream back up

at least on twitch:

https://www.twitch.tv/unrealengine

[prime axle]

My PlayerController has no Playerstate associated with it, This is on the server aswell.
How is it possible that a controller on the server has no PlayerState??

[thin stratus]

Might be too early to access it?

[worthy perch]

Check your GameMode?

Perhaps your default PlayerState is nullptr?

[prime axle]

Definitely not too early to acces it @thin stratus , Claling it in a custom "DoDamageOnServer" Function on my pawns. so definitely enough time has passed to replicate
And Default Playerstate, idk where to see that? @worthy perch ?
Weirdest thing is, altough this controller (myPlayer) has no state associated with it. my GameState still reports 2 (2?!) connected playerstates, altough I'm only joining with 1 client

[thin stratus]

Is that an AIController? Or a PlayerController?

And 2 PlayerStates, if you are a ListenServer and a Client, are normal

[prime axle]

Dedicated Server and PlayerController

[thin stratus]

Not disconnecting or so in the meantime?

Not sure

[worthy perch]

Check your GameMode class.

There's a property called PlayerStateClass.

[prime axle]

thought you meant some custom GetDefaultStateForController or something

but yes,

[worthy perch]

Oh, well, it does report two player states.

[prime axle]

also correct

Also, I believe the root of my issue is with my players not disconnecting properly. In my UI I have a button who just re-opens my MainMenu map,
I tried destroying the session on the client using BP Nodes, but it never seemed to return succesfully.
The base jest is that I'm trying to get Rejoin working. so I want to be able to press leave in the in game menu and return on the same server as a new player (not an old one)
I guess i'm not leaving it correctly?

How would i do that though?

[fossil spoke]

@fringe dove id be interested to find out if they answer it in the Live stream

[fringe dove]

@fossil spoke they addressed it a bit towards end, said there was a time variable in the net driver that should be changed to a double. I think that's what that answerhub post tried though and still ran into further issues afterwards

[fossil spoke]

Yeah it would be a bit more conplicated than that.

[fringe dove]

people were mentioning character movement degrading performance, I haven't run into that yet but I think that might be an even earlier thing that will happen, because sometimes it breaks movements into substeps for slide-along-surface, etc., depends if it is only breaking a tick delta into substeps or if it has some parts in absolute time

[grizzled bay]

hello, I am working on a game where each player can become the server and allow their friends to join their game. I have a webserver and am currently able to connect to it through unreal using the Va Rest plugin.
My issue is that I don't want to use steam api, but instead want my players to be able to connect to eachother using ip, but I am not sure the best way to go about it. Is anyone able to point me in the right direction?

[fleet raven]

do you already have the ip of the server? what exactly is the question

when you say "I have a webserver", do you mean you already made a server list and an API for servers to post to it and clients to request it?

[grizzled bay]

i meant i can connect to a database through my website, which would also grab and store the users latest ip when they log into the game. I will be using a friends list to populate the server list, so if a player hosts their game, only their friends will be able to connect. right now i am just using the default create/join session blueprint functions so it doesn't really work for anything except local.

[fleet raven]

if you want the session nodes to use your system you need to implement a online subsystem in c++

[grizzled bay]

my question is how would i go about connecting to the session using an ip instead of setting up steam api

okay, thanks

[fleet raven]

you could also bypass them and just connect manually

either by passing the ip to SetClientTravel or by using open ip console command

[grizzled bay]

thanks, will look into that

[fleet raven]

the open command is quite problematic if trying to make a "connect to ip" dialog

because open MapName will go there in singleplayer mode and similar things

[grizzled bay]

ah, thanks for the heads up, will have to work out how to handle that

if i do it that way

[fleet raven]

probably easiest to just validate it's indeed an ip address with a regex

[modern dome]

How would I create a seamless experience for players when players have a cooldown?
Having the Client to ask "Can I attack" shouldn't be the solution, right?

Should Clients calculate the cooldown on their machine and the server just checks if the Time between attacks is big enough?

would be great if players could just play "independently" with lag (because Mobile) and the Server just "rewinds" and checks if it was possible

[chrome bay]

In theory that would be fine if latency was stable, but lag variance creates a few problems there.

E.g, client may well be able to fire - but if they're running a a higher framerate than the server, or the packet arrives sooner than usual, server may still disagree

[thin stratus]

I wouldn't care THAT much about that. Games like, e.g. WoW or LoL, do the countdown locally

At they same time I'm pretty sure they buffer your attack calls

If you pressed the key x ms before the countdown is done, it will still execute the ability once the server hits 0

Same goes for pressing to attacks in a row

If you really hit a lag, it will most likely not attack anyway

[cosmic star]

Could it be, that sometimes the position of an actor is mismatched on the Server and Client?
I placed an actor in my rest level and when I do a linetrace from screen to centre of camera the actor isn't picked up correctly
On the Client it has the correct position, but on the server the actor appears to be moved to the left.

Any idea what the cause might be?

[limber wagon]

Not sure whether to put this in the BP channel or here, but as it's networking thought this would be the best place. I'm trying to get a smoke grenade wired up and it either spawns the emitter on all clients but never disappears, or spawns the emitter only on the server and owning client, but no others

Am I missing something really obvious?

The actor itself replicates fine, and the parent actor properly deals damage (etc.) but the emitter is causing problems despite it being a multicast

Edit: Fixed the issue but it's far more strange than I thought, might be a bug. Will try replicate in a blank project and then submit it as a bug if I can

[meager spade]

is your multicast reliable?

is your server call reliable?

also your killing the actor before stopping the particles

also you shouldnt need to call stop particle emitter

multicast the lifetime and set the lifetime on all clients copy of that actor

https://gyazo.com/6719915b22d8a5bf0a432790e0e6497e

something like this would work just fine

altho personally

https://gyazo.com/fcd3b58280b6c70685bc26dbd52f9e9d

would be all round better

[tall knot]

Hey! I have an issue with replicating something. Basically I have a Lobby where all my players wait for the host to start the game, when all players are ready, the host presses the start button, when he does so, I want all the lobby menus to disappear from everybody's screen. Right now only the host manages to remove the lobby menu. Here is the custom event that is supposed to remove them :

I managed to get an array variable that stocks all the player controllers who connect to the session and I'm trying to remove the lobby menu widget from each of them but it doesn't work, any suggestions?

[worthy perch]

There are several ways you can do this.

1. Client RPC to each PlayerC telling them to remove their widget.
2. Multicast RPC to every client telling them to remove their widget.
3. The better way, have some variable with ReplicatedUsing that when a condition is met, remove their widget.

[tall knot]

@worthy perch I tried this way, one custom event only runs on clients and the other is called by the host (again only the widget of the host gets removed) I'm sorry if I didn't quiet get what you suggested I should try

[worthy perch]

You have to call the Client RPC on each invidiaul PC. Your set up is that the client RPC is looping through the AllPlayerControllers array.

So you have your ClientRPC and your ServerRPC. In the ServerRPC, loop through the array of AllPlayerControllers and call the ClientRPC from each reference.

[tall knot]

so in The ServerRPC I should get AllPlayerControllers>ForEachLoop>CallClientRPC ?
while in the ClientRPC I just get AllWidgetsOfClass>RemoveFromParent ?

[worthy perch]

Yeah.

Or you could just Multicast that to all clients.

But RPCs can fail, so it is better to use OnRep in this case.

[limber wagon]

@meager spade Thank you, I wound up with something similar to what you had in your second picture. The issue I was experiencing was actually with the SetActorHidden node, basically the smoke just wouldn't disappear if I used that in the parent

There was a MC in the parent that called it, I'll try repro it in another project though

Why it would make the particles only disappear on the server and the owning client I have no idea, the MC was reliable as well as the server RPC

Edit: Couldn't repro the problem, unhooked all nodes in the child BP, rehooked everything back up and it worked, 0 idea, I must have had a wire somewhere it shouldn't have been

[tall knot]

@worthy perch Even like this only the host removes the widget
Again I'm sorry to bother

[worthy perch]

RemoveLobbyWidget should be Server.

As clients cannot Multicast.

[tall knot]

Oh yeah yeah I changed it just to try, initially it runs on server.

[potent prairie]

What I would try is somewhere in the playercontroller, make a variable to that lobby menu widget. Then in your script here you can pass in that PC array element into the remove lobby menu, then get the reference and remove from parent

I do something similar when the player dies, remove the UI widget and replace with a Dead UI

[thin stratus]

RemoveLobbyWidget has to be called on the Server. No need for the Multicast. The other Clients can't access all PC anyway

And RemovePlayersLobbyMenu needs to be a ClientRPC

[tall knot]

Even like this it doesn't work

[frank plover]

can anyone help me with replicating equiping weapons?

right now the guns can only be seen other client for some reason and idk why??

this issome of my pictures i took to help

[frank plover]

??

Can anyone help me please?

[thin stratus]

@frank plover Hey, people will help you when they have time. We are only doing this in our free time, so please be patient.

[frank plover]

okay

[sharp pagoda]

@frank plover this won't work for the client, take a look at this article: https://docs.unrealengine.com/en-us/Gameplay/Networking/Actors/RPCs

Also you need to zoom in on this:

[sharp pagoda]

Yea no that's not going to work

The input has to be managed in the player character, which then either line traces to find which weapon you're looking at or gets all overlapping weapons and calls Pickup() or something on them

[frank plover]

okay so i have to rewrite the entire system then?

[sharp pagoda]

If you designed it like that, yes. Iteration is good, each time you learn from your mistakes from the previous iteration

[frank plover]

if you have a mic it would be easyier to talk and show me whats wrong?

[sharp pagoda]

this is what's wrong in the switching bit (that I can see, not sure if you posted your whole equipping code

You need to dispatch a server rpc first, then run the multicast rpc

Also I'd recommend reading this http://cedric-neukirchen.net/Downloads/Compendium/UE4_Network_Compendium_by_Cedric_eXi_Neukirchen.pdf

[sharp pagoda]

Yikes ok you see this?

bad

You are writing for a very rigid set of weapons

You need to be writing more modular code

[frank plover]

okay

[sharp pagoda]

For example, you would want to have a generic "EquipItem"/"UnEquipItem" functions

The player should never have to know about every single weapon in the game

[frank plover]

alright so then i have to redo this aswell?

[sharp pagoda]

Yep

[frank plover]

okay well then i better get started then is there any tutorials on multiplayer with this stuff?

that you can recommend

[sharp pagoda]

Yea, start by reading the compendium I just linked

[frank plover]

okay i am right now

[sharp pagoda]

Make sure you understand all of it too, if you don't go here or google. It has some fundamentals for beginners you'll need

[frank plover]

okay thank you very much

[meager spade]

@sharp pagoda your good with C++ right?

[sharp pagoda]

Yep

@meager spade

[potent prairie]

For some reason I have to make this collision box way bigger in order for the server to register the overlap. Client detects collision immediately, but the server doesnt overlap until client is near the middle of box. Is this normal?

[potent prairie]

Ok I figured out my problem. Setting the scale in the blueprint isn't being applied on the server side. It's still 1.0. Bug?

fixed by changing scale in construction script. Not sure if this is best practice, I thought just setting the scale in the editor would be fine, but only client picks up that change it seems

[jolly siren]

How is that multiplayer related?

[meager spade]

wrong channel

[jolly siren]

thanks

Does anyone know the differences between exponential and linear network smoothing with CMC? I see that exponential interpolates fasters if further away from the target. Is that to increase performance?

[lament kettle]

Anyone know how to do a event from client to EXTERNAL server, without the use of a heart beat system? Or socket.io method?

Eg. Machine 1: Logs into account and sits on the main menu for 5 minutes.

Five minutes later, Machine 2: Logs into the same account, and thus Machine 1 is logged out and is forced to go into the Login screen.

[livid barn]

what would the use case be, where the same account/client would be allowed to login twice?

cause thats what I think i understand off what you said?

[lament kettle]

I don't wish to allow them to.

So I need a way to kick the "older/first" user off.

Currently I have a heart beat system, for every 30s, it checks if their login token is valid.

Later when they go in game, the server will kick the player.

[livid barn]

ah, so you're getting a case where the client IS able to login twice?

[lament kettle]

Well, I want to prevent that scenario.

Let's say I login, I minimize and open the game again and login again.

I don't want them to login twice, and be able to matchmake twice, etc.

I'll probably add checks and balances, when they queue up.

And when they're in game as well.

I'm assuming a socket.io method is the only way, while the client is sitting in the main menu and not in a game server.

[livid barn]

I came across this system today which you may find semi useful as a sort of pre-login check https://docs.unrealengine.com/en-us/Gameplay/Networking/OnlineBeacons

Also, I would have xpected that when you have "Client1" login, it would identify it self through whatever subsystem you're using, ala an account name or something? Thus once the server is happy with their account they then would be given some sort of token?
SO if "Client1" logs in with a second active client connection, the server would see their name again and go 'hey, you're already here, I'ma go boot the older one of you off now'

?

[lament kettle]

SO if "Client1" logs in with a second active client connection, the server would see their name again and go 'hey, you're already here, I'ma go boot the older one of you off now'

Correct

Also, this online beacon thing is pretty much what I needed.

Thanks @livid barn

[cedar finch]

I'm drawing blank on replication for some reason. So on my player damage event I want to call a DamageOverlay event. It works but the overlay only appears on the Server player. Clients don't see the overlay when they take damage. https://i.gyazo.com/f2f7b9e72ab6dc763880b5641552ba88.png

[fossil spoke]

See this Icon.

It means that this Event only runs on the Server

@cedar finch

You will need to either use an RepNotify or RPC to get the Client to react to that Event.

[cedar finch]

Thanks. Idk what i was thinking. I made an RPC and now it works fine. Must be that time of time night where I need to just call it and chill.

[red glade]

I'm in need of some C++ networking help getting some foundations set

[limber wagon]

@red glade Bit of a wide topic, there are tutorials that go over that sort of thing. Is there anything specific you're having issues with?

[bitter oriole]

Anyone has experience with seamless travel ? I can't seem to get my PlayerController + HUD to not get destroyed when traveling from client to listen server.

Dunno if that's expected.

[thin stratus]

@bitter oriole What are you expecting?

"Traveling from Client to ListenServer"
I don't fully understand what exact thing you mean with that

A Client connecting?

A Client following?

[bitter oriole]

Client starting a host session

As a listen server

[thin stratus]

That's a Hard Travel

Not a Seamless Travel

[bitter oriole]

🤷 Transition map is used

[thin stratus]

Usually, OpenLevel stuff are HardTravels

While ServerTravels are SeamlessTravels

[bitter oriole]

ServerTravel is used here

Not open level

[thin stratus]

Ah well, never did it like that. I only ClientTravel with ?listen when hosting.

Anyway, even if you perform a SeamlessTravel

Your HUD is probably not surviving that

As far as I understood and used the system, the Actors will all be destroyed anyway, the only difference is, that during a small period of time, both are alive

So old and new GameMode, PlayerController and PlayerState

And then whatever you declare in C++ as surviving

You can then use functions like "OnSwapPlayerControllers"

or "CopyProperties" (PlayerState) to move data between old and new instance of the specific class

[bitter oriole]

My understanding is that HUD dos survive (it should, per the PlayerController class)

But only when staying a client

[thin stratus]

Is it listed in the "SeamlessTravelActor" array?

[bitter oriole]

Yeah

PlayerController does that

Not even my code 😛

[thin stratus]

Fair enough, well I'm still not sure if the hosting process should be a seamless travel

[bitter oriole]

Seems to work now, FWIW. I've handheld the destruction of HUD nicely and the entire workflow seems to work

[thin stratus]

https://docs.unrealengine.com/en-us/Gameplay/Networking/Travelling

I can only say what the docs say

[bitter oriole]

That page it out of date though, at least regarding HUD

At least it should say that HUD is kept too, like PC is

[thin stratus]

Any actors further added via APlayerController::GetSeamlessTravelActorList called on local PlayerControllers

It's just not directly listing them

It also doesn't list the PlayerState

[bitter oriole]

Right

[thin stratus]

Only that Controllers with PlayerStates will survive

void APlayerController::GetSeamlessTravelActorList(bool bToEntry, TArray<AActor*>& ActorList)
{
    if (MyHUD != NULL)
    {
        ActorList.Add(MyHUD);
    }

    // Should player camera persist or just be recreated?  (clients have to recreate on host)
    ActorList.Add(PlayerCameraManager);
}

Even the CameraManager survives

Well, I mean, they all die eventually right?

They just survive long enough to move data from old to new

At least I've never actively had the same PlayerState as in the previous match

I only CopyProperties over from old to new

[bitter oriole]

Unless you move from client to server, in which case PC & HUD & etc all get actively re-created as new instances, and old versions destroyed (EndPlay etc) immediately

[thin stratus]

Yeah well, it's stated to do a hardtravel here anyway

void AGameModeBase::GetSeamlessTravelActorList(bool bToTransition, TArray<AActor*>& ActorList)
{
    // Get allocations for the elements we're going to add handled in one go
    const int32 ActorsToAddCount = GameState->PlayerArray.Num() + (bToTransition ? 3 : 0);
    ActorList.Reserve(ActorsToAddCount);

    // Always keep PlayerStates, so that after we restart we can keep players on the same team, etc
    ActorList.Append(GameState->PlayerArray);

    if (bToTransition)
    {
        // Keep ourselves until we transition to the final destination
        ActorList.Add(this);
        // Keep general game state until we transition to the final destination
        ActorList.Add(GameState);
        // Keep the game session state until we transition to the final destination
        ActorList.Add(GameSession);

        // If adding in this section best to increase the literal above for the ActorsToAddCount
    }
}

Here is the GameMode list

It's all actually pretty straight forward. It's only tricky if you are stuck on thinking the way hard travels work (like using PostLogin for everything)

And suddenly you notice "Yo steam needs SeamlessTravel" and your ServerTravels start breaking cause PostLogin etc. isn't called anymore on the second map

[bitter oriole]

Yeah I've been doing all of this with Steam, ServerTravel and ClientTravel

Just want seamless travel for the better UX

[thin stratus]

Technically, even without steam, you should use it

It's just that most beginners have 0 idea about it

They put all the stuff into Postlogin

and then it all goes bad

[bitter oriole]

Thanks for the details ! I'll probably have a few more questions on that, but... breakfast first

[thin stratus]

Sure. Have a nice breakfast.

[prime axle]

If I set a Client's replicated variable on the Client , it doesn't get replicated to others, right?
Only if I set that Client's Replicated variable on the server or call a Client to Server RPC from the client, correct?

[bitter oriole]

Right

[thin stratus]

Yop

• the ServerRPC only works on ClientOwned Actors.

[prime axle]

Cool - just checking 😄

Thanks fellas

[bitter oriole]

Well, it actually didn't work - ClientTravel() with TRAVEL_Relative doesn't connect to a new server

And TRAVEL_Absolute doesn't work with seamless, apparently

"Unable to perform seamless travel because TravelType was 0, not TRAVEL_Relative"

Calling ClientTravel with TRAVEL_Absolute and Seamless to false is even weirder, does apaprently nothing

Okay, so - it's not actually possible to connect to a new server with seamless travel

So it's completely useless really

[lime skiff]

I have an ue server which stores persistent data via save games (as first iteration). To try out things via internet, amazon gamelift was recommended. The gamelift documentation says, it is for session based games. Unfortunately, I didn't found any information if gamelift also provides storage (which the game server instance can access) for cross session, persistent data. Do you know if it does?

[near knoll]

guys help pls, there's a blocking collision exist on the server that's not exist on the client, when the character jumps on he falls down (in client side) to the ground, however (in server side) the character still on the collision
is there anyway in the character movement component a thing that makes server has authority over the client while falling ?

[winged badger]

You need the collision client side

As well

[tall knot]

In a multiplayer if I want to remove a widget from the window of every player when the host presses a button, should I handle that in the GameMode or in that particular widget?

[red glade]

Particular widget is client side, likely.
I'd just send the client data from game state to the client to remove it.

server doesn't really have a call to your client widget

The host can change the game status of the server, so the clients can listen for that change and do it themselves.

[tall knot]

The players have that particular widget in the lobby map which doesn't have a game state (sorry if my questions sound stupid I'm learning the ropes here), should I create one just to handle that instead of doing that in the lobbymode? if so, why?

[red glade]

Alternatively, you could just tell the player char itself to open up/close a widget

you'd save umg vars locally, and server just calls saying "remove the lobby menu" so you respond by opening the umg var for the lobby menu, then closing it.

[tall knot]

I actually have a LobbyController that tells every player to open that lobbyMenu, maybe it would work better there?

[red glade]

I'd do it there then

How is it telling the players?
Btw this seems more of a #umg topic but its network related umg so 🤷

[tall knot]

The display is done in the lobbyPC

Yeah I know, I've tried going to the #umg topic but they told me to go here x)

So I've tried doing this in the LobbyPC

I put a print to confirm that AllPlayerControllers holds the correct values and it does

Then I call this in the GameMode

LobbyMode*

Oh also, the host is able to remove its lobbyMenu

But it doesn't suppress the client ones

[red glade]

uhm, to my knowledge it doesnt seem you are passing a char to the "Remove Players Lobby Name" func

try this

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

[tall knot]

I can't

[red glade]

might need to cast it

Do you know if that func is called on the player correctly?

I.e its just trying to remove it

No actual indication, maybe that call is failing

[tall knot]

Yep the AllPlayerControllers gets diplayed twice, doesn't that mean that the client runs it?

[unique thunder]

I set a component in my character BP to replicate and I'm trying to run a client RPC to cast to another player, get a reference to his component and set visibility to false so that I don't see it but others might. This doesn't work, what's the correct approach?

[twin juniper]

I've been looking for any tutorials or examples of Proximity Voice chat

Does anyone know of any good resources? I've been unable to really find much on the topic

[winged badger]

@unique thunder sounds like s job for OnlyOwnerSee

Alternatively, BeginPlay if Owner cast to Pawn is not LocallyControlled set Visibility to false

[twin juniper]

How do we force OnRep to run?

It is being called before BeginPlay()

;-;

[winged badger]

That is not really surprising @twin juniper

[twin juniper]

Is there a way to change that?

Because I set a variable for the material in BeginPlay()

So when OnRep is called... That variable is Null

[winged badger]

How is it set?

[twin juniper]

So

I spawn my actor in the game mode, and then I create a dynamic material instance based on the 0th index material

then i apply that material instance

does that make sense?

[winged badger]

Ok

How does vlient get the ingo?

[twin juniper]

huh?

[winged badger]

Client*

[twin juniper]

the ingo?

[winged badger]

Info, sorry on mobile + large fingers

[twin juniper]

they get the color variable (which is using ReplicatedUsing) right after i spawn it

So

Spawn Actor => That actor creates the material instance in beginplay() => I have a replicatedusing variable on that actor called "Color" and i set that color from my save data right after we spawn it.

Then once that variable is set, its calling OnRep()

but the dynamic material instance is still nullptr

because beginplay() hasnt been called yet

[winged badger]

Set function... if dynamic material is null, create it, then set the parameter

Instead of doing it in beginplay

[twin juniper]

you mean in the onrep?

i tried that

[winged badger]

Takes color input

No

[twin juniper]

we can't create the material on the server

because servers dont have materials

[winged badger]

Ok, dedicated

When onrep runs, you get thr correct color?

[twin juniper]

yes

but i have an if statement

if (DynamicInstance)

and its always NULL

[winged badger]

Thats fine

Else <create instance>

Then set parameter

[twin juniper]

i triied that

[winged badger]

And drop it from BeginPlay entirely

[twin juniper]

but then its just empty

[winged badger]

Or it will override it

[twin juniper]

it's grey

when i do that

just the default material

the grey grid material

[winged badger]

This is c++?

[twin juniper]

ya

[winged badger]

PostNetInitialize?

[twin juniper]

huh?

idk what that is

[winged badger]

Iirc a function that should fire after Actor gets its replicated variables

Altho, OnRep should work fine as long as BeginPlay doesn't create new instance ontop of thr first one

[twin juniper]

@winged badger i got it

:D

[winged badger]

You can also move dynamic material creation to constructor

[twin juniper]

ah?

i did not know that

[hexed cairn]

does anyone know why the 'GetGameMode

oops. does anyone know why the 'GetGameMode' node would not work (not return a valid reference) as a client in a NetSession?

[worthy perch]

Clients do not have a GameMode.

@hexed cairn

[haughty furnace]

Good evening, we would need help to create a linux server on UnrealEngine 4. Our game is currently in pear to pear and we need help to use a dedicated server.

[hexed cairn]

@worthy perch thanks, I guess I was thinking of the wrong class. time to take all the GM references out of the GI

[fleet viper]

hey there i want to set a enumeration vaiable in the base player state in my widget via a combo box. But somehow its not working for clients even client to server doesnt work clients just dont display the correct role to the others

[fossil spoke]

If a Client changes something, they must send an RPC to the Server with the new value so that the Server can verify it and update it either via Replication or an RPC to other Clients.

Replication does not work Client to Server. RPCs are the only method for Clients to talk to the Server.

[plush wave]

How would one continue a game when the host is disconnected (like in civ 6 or halo reach)

[versed socket]

The recent livestream was very informative! One of the big takeaways for me was the comment they made near the end about how Reliable Events should be avoided at all costs. What they said specifically was that instead of replicating event calls you should be replicating property changes (i.e. changing a boolean rather than calling a function).

I'd imagine that in order to do this, you'll need to run some kind of timer function or use Tick in order to process the variable changes and call functions. However, we've also all learned that Tick in general is bad to use.

How do we reconcile this seemingly contradictory difference?

[severe widget]

OnRep

[fossil spoke]

Host Migration does not exist in UE4, you would need to implement that yourself somehow @plush wave

[severe widget]

Also tick is not inherently bad

BP tick will eat perf quickly tho

[fleet viper]

@fossil spoke even if the value is replicated like the player state?

[plush wave]

@fossil spoke ok thanks for the info. Any suggestions? Serialize the game mode data and send to a client, then have them start a server and reconnect other existing clients?

[fossil spoke]

@plush wave No idea mate, never tried it, probably never will.

[severe widget]

@plush wave Basically you'd override the connection lost logic and do something like a beacon that the clients connect to if the host leaves, then a host is chosen and everybody connects.

Never done it before tho

[fossil spoke]

@fleet viper Your PlayerState is replicated so that all other Clients get it, so that you can share information, your properties inside it still need to be marked as Replicated.

[plush wave]

Thanks guys. Sounds like uncharted territory. I’ll dive into it some more

[fleet viper]

@fossil spoke still not working and my enumeration var is replicated and set as replicated in the cpp code

[fossil spoke]

@fleet viper Widgets cant have Replicated variables nor can they send RPCs, they are Client side only and dont have a NetOwningConnection, you need to use a class like the PlayerController as an intermediary in order to have Widgets send network information.

[fleet viper]

oh well thanks then

[analog violet]

so I have a question for y'all. if any of you guys know Unreal Engine 2 or are familiar with it. First, I am trying to mod a game called Star Wars Republic Commando which is made in UE2. What I'm trying to do is make a Redirection/Download fix/mod for it. What I want to know is what does the Class UWeb do entirely?

Since UT 2003 has it and SWRC doesn't

[fossil spoke]

Mate i doubt very very much that anyone would know UE2, its nearly 20 years old mate.

This is a UE4 server.

If you want to ask for help with UE2 your going to have to do it in #lounge.

[analog violet]

big rip to UE2

[knotty frost]

anyone know whats up with 4.20 and the -force_steamclient_link change? ever since 4.20 ive been forced to load the steam client dlls on packaged server builds which generate steam client artifacts, without this switch steam fails to initialize for servers

[bleak lily]

hey for some reason my player isnt respawning

but its a certain character that doesnt respawn

the other ones do but this one doesnt for some reason

[knotty frost]

@bleak lily the spawn actor call could be failing, if you have it setup to fail on bad locations

[bleak lily]

Ill see if thats the issue

oh its because my health system doesnt work

[winged badger]

@plush wave expect Unreal to fight you every step of the way

its not just the GameMode, its GameSession, all AIControllers

also the clients are connected to the host, directly, and UE doesn't like to have more then one level open at a time

so you'd not only have to serialize everything clients don't know and keep it as a backup on one of the clients, you'd also need to stop the unreal for terminating the backup host's game on connection loss, manually reconnect all the clients to the new host

[bleak lily]

oh wait I found the issue the actor gets destroyed before he can possess the other actor as a spawn

so the whole event wont go through

[winged badger]

and seamless travel won't work here, its made for travelling to another map on the same server, not for jumping servers

[bleak lily]

wait so I have two characters how would I make it so when one gets possessed its nnot named the fps controller

like is possesing the only way to take over an actor

because once he dies he becomes the other character by possessing it

but it still is considered the human

[winged badger]

also figure out how to make the new host listen to incoming connections while doing it

[bleak lily]

yeah but is possessing the only way to control an actor

or

[winged badger]

i have no idea what you're asking @bleak lily

"named the fps controller"

[bleak lily]

its hard to explain but I will try to make it more simple to understand

because I made it sound way more complicated than it is I feel like

actually let me do this so how would I possess a character once the actor is destroyed/dead

since wouldnt the event end once the actor is removed

[winged badger]

what event?

[bleak lily]

actually its easier for me to screenshot it

[winged badger]

destroying a possessed pawn does not destroy the player controller

[bleak lily]

https://gyazo.com/470160a73980009ed7c8dd87481f3d18

[winged badger]

and player controller IS the player, the pawn is just a... puppet

[bleak lily]

the server tps spawns in the new person

and possesses it

[winged badger]

ouch

there is a restart player event/function in gamemode, you might want to look into it

EventRadialDamage, i am not sure if it fires on both server and client or just the server

but client does not need to Destroy a replicated Actor, only server should do it

and if its server only, then that Server RPC is redundant

[bleak lily]

wait if I do the restart player it should be the new one or

[winged badger]

also, i have no idea what you're pulling in Object in the Cast node from

[bleak lily]

oh its a get owner

yeah this is the rpc I have

https://gyazo.com/18525e559a101908b2752d38cbcc986e

but yeah this is supposed to spawn in a new character somewhere on the map

[winged badger]

and it does

unless you have a LogSpawn entry in the Output log telling you exactly why it failed

[bleak lily]

yeah the thing is how do I destroy my old actor and then call this event

since destroy actor gets rid of everything right

[winged badger]

look, i don't know if EventRadialDamage fires on clients off the top of my head

[bleak lily]

I mean its able to destroy the actor on the host and client

[winged badger]

after you Destroy the Actor, its GetOwner and GetController should no longer be valid

and you're using it after Destroy node

[bleak lily]

yeah thats the thing if I did it before wouldnt it just get rid of the new character I called from the event

[winged badger]

and both Destroy, Possess and Respawn should be handled on server only

how? its called on an instance of the character that took damage

it can't magically migrate to another

[bleak lily]

how do I do an instance

[winged badger]

i am sorry, do read on some basics 😦

i am going to bed

[bleak lily]

alright

is it a child actor?

oh it is I think

[twin juniper]

Has anyone had trouble with listen servers with steam OSS and UE 4.21.1 ?

Before 4.21.1 in 4.18-4.19 I could create a listen server using steam's oss and see lobbies in my game, and others could see lobbies. I since upgraded my game to 4.21.1 and i can't get others to see lobbies i host and i cant see lobbies they host.
even with ports forwarded

nothing has changed in my code so i'm quite curious. Anyone else had this problem?

[glacial pollen]

I have a ton of actors that randomly decide if they want to replicate to my single client.

I have tried loading the game and waiting 10 minutes, and when I come back, some of them are still not replicated. However, if THEN put a break point into my "is valid" loop, after a few triggers, they will suddenly replicate

[severe widget]

Anybody know how typical it is that PostLogin won't have valid net ids?

[misty stirrup]

is tmap replication still not supported?

[severe widget]

nah its not supported

[fossil spoke]

It probably never will be

[jagged garden]

@glacial pollen If you are talking about a significant number of actors that are all replicating that might be why

[glacial pollen]

We are talking about 20 or so at the same time

[jagged garden]

hm

[glacial pollen]

I do the EXACT same thing every time.
Sometimes all load
Sometimes a few load
Sometimes.... NONE load.

When they all load, everything is gravy
When none, or some load, I just drop a debug point into my "IsValid" loop, click play a few times, and remove the break point, and hit play again, and within a few seconds it usually will pop up

If I don't do that I can sit there for 10+ minutes and they wont load. I HAVE to mess with breakpoints.

The client even gets a list of these actors in a replicated array. The count is always correct as well, some of them are "none" but those are the ones that havn't replicated yet

https://cdn.discordapp.com/attachments/433524427850907659/536283088981065753/unknown.png

The "No" on the top right, is an example. I force the client to wait for all replicated actors in this "is valid" array.

I've double checked, begin play for each actor is being called on the server

[glacial pollen]

Just to make sure as you can see above, the server has spawned the actor, its begin play has ran, the correct character owns this actor, and the correct player controller owns the character. And it is running under the server (is server bool)

So.... I'm 100% that as far my setup goes, its correct.

[halcyon abyss]

Hey guys,
Does anyone know of a service that I can rely on to advertise a listen server when it's created? I'm looking for something that doesn't rely on steam so that people that buy the game on different stores (Gog, itch, etc) can actually play together and see a server list given by a master server that's not tied to a store.

[pallid mesa]

Maybe @potent raven can help you @halcyon abyss

Just in advance, take a look at uetopia

[halcyon abyss]

@vorixo alright thank you so much! What about gamesparks?

[worthy perch]

This is a bit vague, but what general stats are the most important when using the NetProfiler? I'm currently primarily targeting Outgoing Bandwidth Avg/s.

[pallid mesa]

@halcyon abyss yes, just read a lot before you decide on something. Element is the creator of uetopia, that is why I forward you to him since he has a good glance on subsystems in general.

GameSparks might be a good choice however no matter what you choose you'll end up having to deal with pros/cons

The norm usually is hybrid solutions

[halcyon abyss]

@pallid mesa mmh, i dont understand if I use gamessparks can I just rely in the fact that it advertises the servers I create? Or do I have to use their whole realtime system?

[twin juniper]

When player connecting to server, disconnect, and connect and again disconnect, and he can't connect again after this, why?

[red sand]

How to fix this?

[halcyon abyss]

@twin juniper are you destroying session on player that is logging out?

[twin juniper]

@halcyon abyss player logout from dedicated server by open level blueprint

[halcyon abyss]

It think you need to destroy session from client and then open level on success... And on failure... If I remember correctly when a client quits it should call destroy session... Although it sounds like a server-only thing

[tall knot]

What is the proper way to restart a game(level) with all the players that are already connected in the session?

[twin juniper]

im trying to implement multiplayer and im having a hard time wrapping my head around all these concepts so please bear with my super basic questions

i have some actors that in their BeginPlay run some code that changes their material's color based on a random number. as it is right now, it's run on clients separately so each client gets completely different colors

how would i make it so that code runs on the server, and then replicates the actors themselves?

should i instead run this code on the constructor?

[worthy perch]

You could run it in the constructor, yeah.

But you can send data to other clients through the server.

[twin juniper]

how would i do that? also should i use UFUNCTION(Server/NetMulticast)?

[worthy perch]

You can use RPCs or replicated properties.

[twin juniper]

actually it doesnt seem i can use that on BeginPlay it just gives me a bunch of compile errors

[worthy perch]

What errors? You should be able to.

[spiral oar]

Hello i'm fairly new to multiplayer and i want to know where should i "store" my code (BP) if i want to for example make shooter game,can i put everything in level BP or game instance bp?

[twin juniper]

if i add WithValidation i havent implemented the Validate thing so that just throws more errors

the other 2 errors dont seem related to that though

[worthy perch]

https://docs.unrealengine.com/en-us/Gameplay/Networking/Actors/RPCs

bool SomeRPCFunction_Validate( int32 AddHealth )
{
    if ( AddHealth > MAX_ADD_HEALTH )
    {
        return false;                       // This will disconnect the caller
    }
    return true;                              // This will allow the RPC to be called
}

void SomeRPCFunction_Implementation( int32 AddHealth )
{
    Health += AddHealth;
}

[fleet raven]

wow what a terrible example for the docs page 🤔

[worthy perch]

What's terrible about it?

[fleet raven]

that an rpc to increase your health exists at all

[worthy perch]

Oh, yeah.

[fleet raven]

making WithValidation required is so silly in general

99% of them in engine and games are just return true

[worthy perch]

Yup, I've never put any logic in them.

Though, I would like to prevent speed hacking. --but that wouldn't be done with RPCs anyway.

[winged badger]

i do agree that having that RPC is terrible 😦

you're basically giving the client a license to hack

and you don't get anything for it

[worthy perch]

Actors that are dormant are no longer destroyed on clients when out of NetCullDistance, is there a way to still have them destroy when out of distance?

Also, does AlwaysReleveant and NetDormant conflict?

[twin juniper]

so how do i make VS recognize the implementation/validation functions?

ive got this

and this

do i have to define them in the header as well?

because the example only shows this

[twin juniper]

ok i solved it

it was COMMENTS

[fleet raven]

@lament cloak based on a quick VA search, it looks like unreal will at one point sort pending actors based on the time when an update was last sent, a newly created pending actor will use SpawnPrioritySeconds as a placeholder for this time since last update

[agile lotus]

anyone who uses advanced sessions do you know if theres an event like OnRecieve Invite?

[bitter oriole]

IIRC, there isn't

The OSS interface has such a callback, but Steam doesn't actually call it

There's placeholder code in the session plugin

[agile lotus]

was trying to use the placeholder realized it wasnt finished

[bitter oriole]

Yeah, I don't use advanced sessions and tried to get this working myself, but Steam simply doesn't do this, as far as I understand

Looking briefly at the Steam doc, that's still not a thing

Invited player gets a Steam notification, but since he might A) not be playing the game, or B) not even owning the game, Steam doesn't fire any callback

[versed socket]

I wish there were a sort of overview blog post or video out there that just sort of explained how all of this OnlineSubsystem* stuff works and is used in practice. Nothing in-depth or whatever, but just sort of hand-waving it all for context so that I can have a mental model of how it all fits together. Right now I sort of irrationally feel intimidated by that stuff, and I've probably gone through just about every Unreal Training Livestream ever.

[bitter oriole]

Feel free to ask questions

Basically OSS is about finding games, inviting players

[thin stratus]

It's actually rather simple. The whole thing uses Interfaces. One Interface for the main Subsystem Class that has functions to return the other interfaces.
The other interfaces are for example the SessionInterface or FriendsInterfaces.
A Subsystem can choose to implement such an interface and then return it.
That's generally all there is.

If you have a Subsystem, e.g. Steam, active and you call "Online::GetSubsystem(FName("Steam"));", then you get the Steam Online Subsystem as an Interface.
You can call "GetSessionInterface" on it to get the Steam version of the SessionInterface.

You never actually touch the Subsystem directly, only the Interfaces and what Epic added to them.
As mentioned, some Subsystems might return null when asking for e.g. the SessionInterface, cause they don't support that.

If there is something not exposed to the these interfaces, cause it's very unique to a subsystem, then you have to use the library directly

e.g. steam_api

I think by now you can also just do Online:: and see all the stuff it returns

[versed socket]

That's a relly good explanation, Exi. Thanks! I've read the Header files for OnlineSubsystemSteam and OnlineSubsystemNull but the context behind it all and how it all fits in with everything else in practice is where the gap in my knowledge lies.

[wary wyvern]

Guys, what is the best way to move character by vector, but save network sync and smoothness? I have a jetpack, which lifts character by using AddImpulse. I add it both on client and server sides, but there are still dyssynchronization and lags.

I've tried using LaunchCharacter. It works better, but not ideal..

[versed socket]

@wary wyvern The recent Networking Livestream said that the best thing to do for MP stuff in general is to use variable OnRep functions everywhere instead of events. So I'd imagine that the best way to move a character is to create a "Destination" or "DesiredLocation" variable and then have the Server change it and replicate that change to the Clients. Then in the Clients' OnRep functions for those variables, it will actually make the Actor move.

[thin stratus]

@versed socket Did that answer fill the gap?

[wary wyvern]

@versed socket I do not use events.. I use OnRep, but my question was about moving character. It does not matter, if there is a destination or not, I'm asking about the way to move it

[thin stratus]

If you want to use the replication of the CMC; you will have to use that

The CMC uses a few forces that you can adjust

One of htem is the LaunchCharacter velocity

void UCharacterMovementComponent::ApplyAccumulatedForces(float DeltaSeconds)
{
    if (PendingImpulseToApply.Z != 0.f || PendingForceToApply.Z != 0.f)
    {
        // check to see if applied momentum is enough to overcome gravity
        if ( IsMovingOnGround() && (PendingImpulseToApply.Z + (PendingForceToApply.Z * DeltaSeconds) + (GetGravityZ() * DeltaSeconds) > SMALL_NUMBER))
        {
            SetMovementMode(MOVE_Falling);
        }
    }

    Velocity += PendingImpulseToApply + (PendingForceToApply * DeltaSeconds);
    
    // Don't call ClearAccumulatedForces() because it could affect launch velocity
    PendingImpulseToApply = FVector::ZeroVector;
    PendingForceToApply = FVector::ZeroVector;
}

Thats the forces it uses in the calculation

[wary wyvern]

I've tried LaunchCharacter, but still had some visual artifacts. I guess the reason is that I apply different force on server and client, due to different start times (server start using force curve earlier, than client).

[thin stratus]

bool UCharacterMovementComponent::HandlePendingLaunch()
{
    if (!PendingLaunchVelocity.IsZero() && HasValidData())
    {
        Velocity = PendingLaunchVelocity;
        SetMovementMode(MOVE_Falling);
        PendingLaunchVelocity = FVector::ZeroVector;
        bForceNextFloorCheck = true;
        return true;
    }

    return false;
}

[wary wyvern]

I gues I have to replicate jetpack curve's time to sync it

[versed socket]

@thin stratus Yes, that does fill a lot of the gap and it was very helpful, thank you for writing that wall of text for me!

[thin stratus]

You def have to send the same velocity over @wary wyvern

[worthy perch]

How are TArrays replicated? Is the entire TArray serialized and sent if I change a item in the array? Particularly, if the TArray is an array of fairly large structs.

[bitter oriole]

Replicating large structs is probably a bad idea to begin with, generally speaking you shouldn't need to

[worthy perch]

Yes, I do realize that it was a mistake. It was for an ingame inventory system.

[winged badger]

@worthy perch i suggest reading NetSerialization.h header

its comments explain how to implement NetDeltaSerialization, and even provides an example

[worthy perch]

Alright, I'll do that now.

[limber wagon]

I'm making a networked grappling hook and while the actual functionality works, I'm having issues with getting the cable to show on other clients

I'm using a replicated cable component on the actor and then setting visibility on/off as needed. Am I correct in saying that a multicast should NOT be used to make the cable show/hide in this case, because the cable would then appear for all actors of that type?

[winged badger]

if you replicate the target for the hook and RPC the action that causes it to deploy

you'd be fine just simulating the cable component

generally you can't assume that a variable in engine component replicates that way you'd want it to

[limber wagon]

Yeah I suspect that that might be the problem actually, will take a second pass, thanks 🙂

[pallid token]

So, I have Server-owned ships, and they are jittery as hell on the clients. I suppose that's to be expected, and I'm guessing this would be a place for network smoothing. However, I have literally no idea how to use network smoothing. Does anyone have a resource I can use to familiarize myself with it?

[twin vault]

i believe "Unreal Multiplayer Master" on udemy have some classes on client prediction

but you can find some stuff on youtube searching "client side prediction"

if you go with the udemy course, the discounted price is permanent dont feel rushed

[pallid token]

... I actually have that Udemy course, already. I totally forgot I bought it... I'll show myself out 😊

[glacial pollen]

Spawning actors in a recursive loop is broken

Valid in server, client randomly gets the actors

If I use a regular loop all is fine

[twin juniper]

so for some reason, my material replication thing works but not when loading in a packaged build\

[glacial pollen]

If you package your game in Dev mode, you can attach visual studio to it and get the output log live

@twin juniper

Dev mode is on by default I'm pretty sure

So just open your project in visual studio, and in one of the top menus is the "attach to process" option

So run your game, attach to it, and then get to the point where it doesn't work and see if any errors come up

Also, do not ignore warnings in packaging unless you know explicitly that they are useless or not expecting to work correctly anyways

Also check the output log while you open the editor, and also open everyblueprint one by one and check for errors or warnings in the output log

Some errors or warning won't show u til you open the box manually

[strong abyss]

I have a button that calls a Server function.
But the server GetGameMode in the Server function returns nullptr so it appears to be running on the client?
Any ideas what I'm doing wrong?

[fossil spoke]

Is GetGameMode returning nullptr or is the Cast failing?

You maybe using the wrong Gamemode

[strong abyss]

It is returning nullptr

I even added a HasAuthority() check and it is failing too. But I have the Replicates on the Event set to Run on Server?

[fossil spoke]

Oh, your in a Widget. Widgets dont have a NetOwningConnection, they are Client side only and cannot send/receive network information.

[strong abyss]

Ohhh.

[fossil spoke]

You need to use another class like PlayerController as a means to send any RPCs that a Widget needs

[strong abyss]

Interesting okay.

Thanks!

[peak patio]

Hey guys, I have a small problem with the "IsLocallyControlled" Blueprint node. It appears that it works as intended, except with listen server : in the listen server, the fonction return false, even if a pawn is controlled locally... Got any idea on why / how to fix it ?

[glacial pollen]

Delay nodes and tick are the devil

And begin play

[peak patio]

ahah, that left me with little solutions 😛

[wary path]

@peak patio I had a similar problem some time ago. IsLocallyControlled returns false if PlayerState is still invalid, which might be at the start. So check for valid player state first.

[peak patio]

well, it runs every tick and is false at every tick :/ ... I expect it to be true at least after a certain amount of time, but no

[wary path]

@peak patio sorry my call was a different, in my case it was "IsPlayerControlled"

for IsLocallyControlled you can check whether "GetController" is valid, just to debug, and which kind of Controller it returns.

[peak patio]

thank your for you help lotodore! In fact, I may have a bug somewhere else in my code...

the "Is Locally Controlled" seems to work fine after some debug

[jade gazelle]

Does adding an element to an array trigger RepNotify? Or is that only called from a Set variable call

[calm plaza]

Destroy Session - Invalid Playerstate. Anyone else had this pop up? Fix?

[grand kestrel]

@jade gazelle if the elements change it'll replicate

[wary path]

@calm plaza https://issues.unrealengine.com/issue/UE-38897

[jade gazelle]

@grand kestrel thanks!

[calm plaza]

@wary path It isnt actually happening when i try to destroy sessions. says its happening after opening listen server map

[2019.01.21-22.10.46:969][207]LogNet: Browse: /Game/Maps/Empty?listen
[2019.01.21-22.10.46:969][207]LogLoad: LoadMap: /Game/Maps/Empty?listen
[2019.01.21-22.10.46:969][207]LogScript: Warning: Script Msg: DestroySession - Invalid player state

LAN and WAN arent working....ugh.

can find a lan session but doesnt travel client to server map. cant even find a public session.

[bleak lily]

I have a server browser that works in ue4 but when I packaged my project it doesnt work

I have no idea why since it used to before

[wary path]

@calm plaza are you testing "Standalone game" or "PIE" or packaged game?

[calm plaza]

standalone. on two seperate pc's

[wary path]

which online subsystem?

if it is "null" (the default), then it generally will only find LAN sessions, but should work with two standalone games.

so you need to debug 😦

[bleak lily]

yeah any reason why mine isnt working

it used to befor

I packaged my project

[wary path]

@bleak lily did you also package the server?

[bleak lily]

how do you do that

I just hit package project

[wary path]

are you running both client and server as packaged projects?

they are not necessarily compatible

if you use server in UE Editor and client packaged

[bleak lily]

oh I opened the two exes

they are the same

[wary path]

ok then I have no idea, Firewall, ... the usual

[calm plaza]

Steam OSS u

[bleak lily]

I mean I can try testing it with two computers

like internet

I only tried lan

[wary path]

for steam OSS you need to setup app Id etc.

[jade gazelle]

@grand kestrel hmmm, having some strange behavior. If I add an element to an array, the clients trigger RepNotify but the server does not. The only way to get the server to trigger it is with an explicit Set variable

[bleak lily]

its just weird since it was working befor

and it works in ue4 itself

[calm plaza]

yead got 480 for app id

[jade gazelle]

Googled around and this seems to be a bug of some kind

[grand kestrel]

RepNotify doesn't call on server 😶

[jade gazelle]

? It does for every other variable I have.

[grand kestrel]

Just use if Role == ROLE_Authority and call it manually

[bleak lily]

wait would the server browser I have work if i am on the game with the same computer

in a packaged project

[jade gazelle]

Well I can get it to work just by setting the array variable. Then the RepNotify function will fire correctly on the server. It’s just odd that array changes like adds/removes only fire on client

[winged badger]

if the client sets the variable locally, it will get a RepNotify as well

hates network in combination with blueprints

[jade gazelle]

Well this is the server adding an index to a replicated array, on the server

I put a test print string in the RepNotify and if I Add the element to the array on the server. RepNotify is triggered only locally on clients

But if I add the element and then Set the variable as well, I can get the RepNotify to trigger on the server

[calm plaza]

I will pay someone a cheeseburger a day to help me get the bugs out of my matchmaking...

not a dollar menu burger either.

gone through every tutorial. read every forum. even stared into the sky. nothing.

[worthy perch]

@jade gazelle , Is that in PIE? If so, the server calling OnRep might be a "mistake". Try in a packaged build.

[jade gazelle]

Not packaged but running dedicated server from command line

[worthy perch]

Did you build for Server?

[jade gazelle]

Yeah

[worthy perch]

Oh, well, that's weird that OnRep would call.

What version?

[jade gazelle]

Uhhh, I think it’s 4.20.3

Might be 4.20.2

[winged badger]

why would you even need a RepNotify on server @jade gazelle

one of the reasons i prefer do to network code in c++ is because there is none there

[jade gazelle]

Just as a quick way to run logic any time a variable is set?

Isn’t that the whole point of it?

[winged badger]

thats what the Setter functions are for

not replication callbacks

you can easily wrap a call that adds elements into the array in a function

[worthy perch]

If you want to support listen servers, calling OnRep on authority is useful. Unless OnRep is already automatically called on a listen server.

[winged badger]

and run any additional logic you need from that function

[jade gazelle]

I mean I don’t think what I’m trying to do is that out of the ordinary. The documentation for RepNotify specifically states that it is called on both authority and remote machines

[winged badger]

in blueprint it is

[jade gazelle]

It seems to just be a bug/limitation with arrays according to dev notes I can find

[winged badger]

i create Setters for my variables that need to run additional logic

my OnRep functions add a bReplicatedSet flag to the object, then just call a setter

[jade gazelle]

I’ll have to look into that as an alternative

If it is better practice

So, in theory would a BP that was nativized lose that functionality?

[winged badger]

every time you use the engine feature in a way it is not explicitly designed for

you risk stepping into a landmine