multiplayer

[real ridge]

i dont see problem with copy there

[marble gazelle]

when do you delete the characters?

[real ridge]

i dont understand question

how when 😄

[marble gazelle]

and how do you prevent that the game mode spawns the characters?

Well you create instances, fine, but are you sure the character you play with is actually the one you have spawned?

[real ridge]

yes game mode has default pawn class none , character is deleted and also player start is

i just dont understand why I have this problem inside editor when I press play

and why not when I run game via icon

inside folder

then is no copy there

[marble gazelle]

hm I have no idea, you will need to debug^^

[real ridge]

I am sad boy

😄

gonna try

but I thank u for your interest

[marble gazelle]

^^ any time

[tender acorn]

Guys, anyone would help me via sharing my screen? 🙂

Im still don`t clearly understand what have to do -_-

[cold magnet]

Is changing ownership to the player's pawn for any given actor an idiomatic way to get RPCs working on the actor rather than on the player controller/pawn? Are there any side-effects I should be careful about? Is there a way to "return" ownership to the server after finishing the RPC?

[dusky yoke]

Hey guys, so I got two questions, would really appreciate some light on them 🙂

1. is RestartPlayer a networked function? Im somethings getting issues on my Client upon respawning, not sure if its that node's fault or not, but yeah. Sometimes the client is unable to move when spawned, whereas the server can move. Am I doing anything faulty? Also, is the RestartPlayer function compatible with setting up a random respawning system? Because right now its just restarting the player in the place it spawned in, but then I guess I gotta control the initial spawning in maybe the level blueprint, gamemode or something?

2. If the listen server starts its server and lets say, a client joins after 1 minute, will an actor thats using a Event BeginPlay be off-sync for the server & client? This actor in particular is firing missiles based on repeating timers. When testing earlier online, the event of the actual firing wasnt multicast so that might fix the sync, but the question is still something Im wondering about 🙂

[real ridge]

guys i have problem here cast to player state always fail.... can someone give me a tip ?

[fathom aspen]

It's either Custom Players Controller is null or the Player State is null(debug your code so you know by inserting a breakpoint).
If it's the former I would use Get Owning Player function instead. If it's the latter you would need to call an event dispatcher that sets the player state inside this widget once Player State is replicated and that's using a RepNotify. I'm not sure if the RepNotify is exposed to BP though

[final oriole]

can someone tell me why the last node doesnt work

im trying to make it so people cant see the pawn anymore

and I want it to be networked

[fathom aspen]

Last node ignores collision, it doesn't make your pawn invisible

You should be using SetActorHiddenInGame

[final oriole]

visibility channel is only for raytracing

it doesnt effect visibility ?

also using a replicated variable? is it always necessary if youre already running stuff on a function thats a server rpc

i was trying to replicate a light switch and it wouldnt work until I used a repnotify variable

[fathom aspen]

Well I'm not a collison guru, but visibility channel doesn't mean what you think it means

[fathom aspen]

Well a RepNotify variable is simply a replicated variable with a callback that tells you the variable value has changed. So technically there is no difference in how they replicate. All you have to care about is that you change the value on the server and not on the client.

[final oriole]

im trying to make the actor invisible on the server but not the client and I cant figure out where to set the actor visible again

anyone pro in networking ?

[fathom aspen]

GoVisible is executing on client which is bad. It needs to execute on the server

Also it doesn't make sense to go visible again immediately right after that. But if you really wanna do that then just call SetActorHiddenInGame(false) right after.

[final oriole]

Im making a game where you need to be invisible to other people but visible to yourself

I deleted the go visible thats in the server call and added a small delay

that seems to have fixed it

[final oriole]

ty for this info though, i didnt know the rep variables trigger callbacks

[near bison]

Has anyone used TurnBased built into Unreal? Any success?
What's the quickest path to build a turn based game in Unreal?

[fathom aspen]

RestartPlayer is a game mode function. So it executes on the server, and as long as your pawn is replicated(which I assume it is) then you're good to go.
What RestartPlayer does is it calls FindPlayerStart, which in turn picks a PlayerStart and spawns the player there. So if you want to change how your players are spawned in these PlayerStart actors, then override FindPlayerStart in your GameMode class.

[real ridge]

I will try 😉

[mellow stag]

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

Why am I getting this stutter?

[fathom aspen]

Also make sure your custom PlayerState class is being set in your GameMode class

[dusky yoke]

Wow, thanks a lot! So in the FindPlayerStart I can essentially getallactorsofclass (playerstart), pick a random item from an array and run that into the return value?

[fathom aspen]

Correct

If you want to make sure players don't spawn next to each other, I think you want to save an array of all player starts and add and remove to that when needed.

Well I just looked through the source and it looks like it already does that for you 🙂

[dusky yoke]

Thats awesome!

[real ridge]

it is done

[mellow stag]

WizardCell do you know why I may be getting this stutter? How could I improve the replication?

[real ridge]

@fathom aspen man i am 23 😄 i feel so bad that u are so smart compared to me I am newbie here

[fathom aspen]

You would probably want to look through the network settings in your CMC @mellow stag

[real ridge]

u are working with ue or just its your hobby ?

ahhh fck still doesnt work can I send here 2 pictures of blueprints so maybe u can see if its problem there :D?

[fathom aspen]

Heh, age is merely a number, don't make that frustrate you. I just started learning Unreal years ago 😄

[real ridge]

i started last year

with singleplayer

[fathom aspen]

Well I make a living using Unreal 😛

[fathom aspen]

Yes

[real ridge]

Ah I just got job also with UE thats why i am learning as much as I can

because I am still at university

this is my first programming job 😄

so here on fist I have editable text in widget i am trying to cast inside custom player state and edit name ( which is replicated)

[fathom aspen]

I'm too. That's why my learning pace is a bit slow. I've also been off unreal for like two years 😄
But yeah you gotta get your hands dirty with this engine so you get better at it

[real ridge]

and here is widget 2nd its lobby when I have READY button I am clicking on ready so I can print names of players

but I am printing default value "player"

its like server doesnt know about change

[dusky yoke]

Is there a way to make the integer-setup more flexible? I.e adding one extra player start to the map would break it right?

[real ridge]

and I have to say that use of get owning player helped with casting no more cast fail

[fathom aspen]

Ok you're setting a replicated variable Player Name in your widget class, but your widget class is client only. Replicated Variables should be set only in the server.

That's why it's printing the default value of the variable, because the variable isn't being set the right way

[mellow stag]

I'm looking at the CMC replication settings, is the net update frequency at 100 fine?

[sinful tree]

You can use a "Random" node which will return a random value from the array.

[fathom aspen]

I really have no idea. I don't do CMC stuff, but you can play with the values there and see what best works for you

[real ridge]

ahh so I need custom event run on server and there set it ?

but it is possible in widget ?

[quasi tide]

Widget's are client only

[real ridge]

i kno but i am typing that name inside widget and also I need print it in widget.... So I need set and get it there

[sinful tree]

Just make the RPC on the PlayerState.

You can then call the event on the playerstate from the widget.

[fathom aspen]

What you would have to do instead though. Is you would have to call a server RPC on your PlayerState and provide it with Player Name and simply what the RPC does is that it sets PlayerName as the provided one.

[real ridge]

ah true

moment

and only server event

or also multicast ?

does rpc mean multicast and also server

event ?

[sinful tree]

Just server.

[real ridge]

guys i am gonna try thank u 😄

i hope i dont act like idiot

[young lily]

I'm experiencing jittery movement on a connected client's character when they move "through" a "disabled" Actor that has a StaticMeshComponent which is invisble and shouldn't have collision. I do this to hide said actor and deactivate it's collision:

Mesh->SetCollisionEnabled(ECollisionEnabled::NoCollision);
Mesh->SetCollisionResponseToAllChannels(ECR_Ignore);
Mesh->SetVisibility(false);

The Obstacle is set to Replicate, as is the Mesh (via SetIsReplicated()). Do I need something else?

I suspect the collision is set correctly server sided but not replicated correctly to the client or something like that

[lost inlet]

and do you do that both client and server side?

collision properties are not automagically replicated

[young lily]

I thought I'd be clever and do this:

if (GetLocalRole() < ROLE_Authority)
{
Destroy();
return;
}
Because logically the client shouldn't need to know about the actor anymore

or so I thought

Might there be an issue if I just destroy it on the client, but not on the server and it's sort of replicated still?

[dusky yoke]

Thanks, that worked flawlessly!

[young lily]

Um.. I might have solved it 😐 without this part it appears to work flawlessly again now. Could have sworn it didn't work before. Hot-reload isssue perhaps? I restarted the editor a few times since

[young lily]

Nope, I didn't solve it. But it only happens with blocks that are destroyed on the server. The visuals are replicated but the rest not. Should probably be easy to solve with an OnRep thing. Thanks

[fathom aspen]

Do me a favor and don't use hot reload: http://hotreloadsucks.com/

[young lily]

I would absolutely love to use live coding, but it appears not to work with UE5 and Rider (at least on my machine), or I just haven't figured out how to set it up correctly

[fathom aspen]

Ah if you're using UE5 then you don't have to worry about hot reload. LC is on by default I guess

I could be wrong, I don't use either one hehe

[young lily]

Yes, but errors ensue. Probably works with VS. But Rider for Unreal I believe is still in an early stage, I use the EAP currently

But I'm still new-ish to the entire UE / C++ thing. Might just be a layer 8 error there 😄

[quasi tide]

It is on by default from what I recall (UE5). To use live coding you don't compile with Rider. You compile with UE (it'd be in the bottom right). You can also use the shortcut.

I forget what the shortcut is though.

[young lily]

me too. I use this little buddy all the time:

[quasi tide]

And Rider is ❤️

[abstract sundial]

The release is in a month >_>

[quasi tide]

We heard it here first 😈

[young lily]

I too absolutely love Rider for my daily C# / .net core development shenanigans.

[abstract sundial]

I mean It wasn't a secret ^_^ we were planning to release it at GDC, but... some stuff happened...

[quasi tide]

Nope - I'm going with it being a secret and we heard it first.

Makes it more special.

[fathom aspen]

Well I should start considering moving to Rider then 😎

[real ridge]

first photo i am calling custom event in player state and second image is custom event that is running on server and I am setting name , on the third I am printing names

so I dont understand whats the problem if I am retard or smth else

[fathom aspen]

What are the odds it's not being executed because it's unreliable?

[real ridge]

i dont know how can I find out 😄

it have to be executed

...

[fathom aspen]

Make it Reliable, and see if it's being called/executed

[fathom aspen]

||Debug||

[real ridge]

and also its annoying to always build server side after compile , I am using dedicated server on my pc ah 😄

[real ridge]

unfortunately reliable didnt help

[fathom aspen]

Well you can use the PIE dedicated server feature for such cases

[real ridge]

u mean inside editor ?

[fathom aspen]

Yes

[real ridge]

sometimes I do but .... sometimes I need anyway to build it dont know why I am just amateur so problem is on my side on 80%

whatever

we learn by mistakes

😄

[fathom aspen]

Did you try debugging your code?

[real ridge]

I just tried to print hello betwen custom event and seting name in state and its executing because I am printing hello

so dont know where the problem is....

so i think this is correct

[fathom aspen]

Executing doesn't mean it works as intended.
That's why you gotta debug your code.

Debugging let you inspect values at runtime

https://docs.unrealengine.com/4.27/en-US/ProgrammingAndScripting/Blueprints/UserGuide/Debugging/

[real ridge]

So if I run it over editor I can see values irl

now i am running from folder

[fathom aspen]

Ah correct, I totally forgot about that

[real ridge]

🙂

[fathom aspen]

I think yes. You need to run in editor

[real ridge]

hmm its interesting i am spectating server and i dont see that something is running but print works wtf

this wont work i just dont see anything

i just have there a lot of clients.. and noone from client 3 is matching

i dont understand u

how ?

yes

[fathom aspen]

You would have to set a breakpoint

[fathom aspen]

Have you read this?

Show the code where you do the attachment

[real ridge]

yep I set one breakpoint and opened call stack and there no stack do display i dont understand

ah I am done 😄

I dont understadn I made points and everything over server and I cant make names

[fathom aspen]

You shouldn't be doing attachments on client. You do it on server and it replicates

[real ridge]

😄 I want help u but I cant I cant make mine also .. 😄

i am done

i dont understand...

[fathom aspen]

Try printing out the value you have in Setname

[real ridge]

i am trying or which you mean ?

not in state ?

[real ridge]

it works

so maybe problem is with print

oh my gosh

[fathom aspen]

Lol no

Well yeah

You was printing it before it was really replicated

[fathom aspen]

Well explain what "works" means?

[real ridge]

I am printing get player name behind set and as u can see I have your name there and it prints same

so

[fathom aspen]

yay my name though 😛

[real ridge]

My blueprint for printing it from custom state variable must be wrong

this

I was trying to print saved names in next widget

this must be wrong

[fathom aspen]

Well you're getting it wrong.

Both are "after" there

There is no before there

Once you're inside that RPC you have a name that has to be set. At least that's what you're printing

If you really wanna see "before", then print the the replicated property, before it's before it's set

[real ridge]

but anyway

its okey

that part with saving names

[fathom aspen]

It MUST be okay

You was not printing the right thing

[real ridge]

so mistake is in widget where I am trying to print it 😄

[real ridge]

hm I am confused I was printing this

and this must be wrong

but this is in next widget

I just put name

then hit join

and i am in this widget where I can click on button

and try to print all names of joined players

and here I am trying to get it and its local

maybe because of this it doesnt work

ohhhhh

iam retard

oooooooooooooh my gosh

i just created custom event , runned on server and try to print it with it

ah

you can see how big newbie I am

😄

[fathom aspen]

Well it's supposed to print out the names if you really click the button after they have been set. PlayerState is replicated to all clients, and GameState is replicated to clients. So It's all good...

[real ridge]

but it doesnt print it 😄

well i just tried to make server custom event and call print there and still i am printing default name Player

I finish... 😄

its like instance isnt editable

[fathom aspen]

I suggest you read Cedric's network compendium if you haven't got to read it yet

[real ridge]

i have i am in half but i didnt have problem before with this i was also savings player score and so on

and now I cant save name in widget....

dont understand

[fathom aspen]

See #2 and #3 pinned messages from the top

[real ridge]

yep

but it doesnt make sense

what is happening in my blueprint

I have same game mode same player state on map

because I am going from entry map where I am putting name to Lobby map

both have own widgets

in lobby map I am printing names...

it has same mode , cclass etc

it looks like lobby widget is connecting to not same customplayerstate

[fathom aspen]

Well make sure CustomPlayerState is the PlayerState Class you use in your GameMode class

[fathom aspen]

Also make sure your entry map level has the right GameMode class set. If you want to make sure that's the case override the GameMode with the correct one in World Settings

[real ridge]

all that things are okey I had diferent game modes but now I changed to same , but still there was same player state class.. iam going to relax now 😄 i am trying to do this almost 4 hours i am done

[fathom aspen]

Also for your knowledge, Player Name won't persist level travelling if you don't tell it to. That's why I suggest you get to know how networking works in Unreal. Again read Cedric's Compendium(#3 message in pinned)

[real ridge]

Okay.

so i think problem is that somehow custom player state on map 2 isnt same as custom player state on map 1

and thats why i am printing default 😄

[fathom aspen]

Wait are you travelling to a new level?

[real ridge]

I thought using event on server side is everything done

I am in Level 1 (start menu) and after filling name and clicked join I execute console comand to my server IP and (open ) level 2 (server)

[fathom aspen]

Ok you didn't say that

[real ridge]

oh i know i see it now.. i am retard

[fathom aspen]

At least I didn't see it

[real ridge]

i cant set server value if iam not on server

i am in server after execute

.... no ?

omg

[fathom aspen]

Well it goes back to what I said

Info in the PlayerState don't persist if you don't tell it to

[real ridge]

so after I open server with ip it is deleted ?

and there is default value

[fathom aspen]

There's a function called CopyProperties in PlayerState that does that. You will have to use it. Also probably you will have to use another function called OverrideWith

That's why you should read that Compendium 🙂

[fathom aspen]

Yes. Info don't persist by default

You will have to use either the GameInstance class or the method I said above with the PlayerState

[real ridge]

gameinstance is good

i can save player name there

then after server opens

i will save from instance inside state

and its done

yep ?

[fathom aspen]

Well no, it's not a good practice

[real ridge]

so i am gonna read compendium

[fathom aspen]

PlayerName is a player specific info. It should reside in the PlayerState

[real ridge]

you are patient with me 😄

[fathom aspen]

Nice now you get the drill

[fathom aspen]

Well I'm good at controlling my nerves

sometimes

[real ridge]

but I will save it in PlayerState and never use instance again 😄 but i know I am gonna read

thank u man

ah

😄

I love u

[tender acorn]

Guys

Why this stuff doesn`t work as i want? 😄

[thin stratus]

What is calling the ServerRPC?

[tender acorn]

When i use it in "server" - it`s destroying only in server

On the other hand, when i use it in "client" - its destroying in server too, but in my side its still exist

[thin stratus]

Is the Actor you are trying to destroy replicated?

[tender acorn]

Hit Actor 0 goes from function "LineTraceBeChannel"

[tender acorn]

Yes

[thin stratus]

Why is the variable marked as replicated if you send it via RPC anyway?

Replication goes from Server to Client. If that variable would actually be used properly, the Server would be the one setting it, which means there is no need to pass it along.

But if you pass it along because the LineTrace only happens locally, then why marking the variable replicated?

[tender acorn]

Im new a multiplayer and other RPC stuff, so i haven`t answer for you 🙂

[thin stratus]

Is the LineTrace only run locally?

What calls the LineTrace?

[tender acorn]

Input Action

[thin stratus]

So you press a Key, you Trace, and you send the Traced Actor to the Server and want to destroy it?

[tender acorn]

Yes

Is it wrong way?)

[thin stratus]

Yes and no

In theory that works, but you should RPC right after the Input, and let the Server perform the LineTrace

Because otherwise Cheaters could destroy whatever they want

But let's assume you don't care about that

You don't need the variable (HitActor0) to be marked as Replicated

The only thing that must be given is that the Actor you hit is replicated

So in its Blueprint, the Replicates checkbox is checked

Otherwise, sending it via the RPC will result in a nullptr for the Server

Cause they can't connect the instances via netids

[tender acorn]

Hmmm

[thin stratus]

What Actor are you tracing?

[tender acorn]

StaticMeshActor

[thin stratus]

A StaticMeshActor is not replicated by default

So this can't work

You would need to make your own Blueprint with a StaticMeshComponent and set the Replicates boolean to true

Then it will work to send it via the RPC

[tender acorn]

Can i change it`s parent to Actor without any issues?

[thin stratus]

StaticMeshActor is a default engine class

Are you inheriting from that or why are you asking?

CanvasPanel is part of the Palette

Top left, just search for it

Also #umg

In what world is that a #multiplayer question :D

[tender acorn]

No, actor which i wanna destroy inheriting from StaticMeshActor rn

[thin stratus]

That sentence doesn't make sense. You might be mixing up some of the terms. Is the Actor you are tracing one that you made your own Blueprint of?

[tender acorn]

yes, it has own

[thin stratus]

Then open that BP

And go to the Class Defaults

(Big button at the top)

[thin stratus]

Then on the right, there is a lot of settings

But you said you are tracing the StaticMeshActor

[tender acorn]

I thought you ask about it

[thin stratus]

No that's the Parent of your own BlueprintClass

So you are tracing your own BlueprintClass

[tender acorn]

Yes

[thin stratus]

Remove the replicated property of the HitActor0 variable

And ensure that what you are tracing is 100% that Actor by printing its name

Also, you should add print strings to your ServerRPC to ensure it even reaches the server

[tender acorn]

It`s tracing this one, yesh

yes*

[thin stratus]

Right, then try to check if the RPC even calls on the Server and what the Actor pin is

[tender acorn]

SwitchHasAuthority helps me?

To make sure that calls on the Server

[thin stratus]

It basically double checks. You can keep it but it's not really changing much

[tender acorn]

HasAuthority almost equal to "Run on server"?

[thin stratus]

No, it checks if the caller is the Authority over the Actor or Remote.
But since you move the call to the Server with RunOnServer RPC, you kinda can't get the Remote pin to trigger, unless maybe a cheater tries to call the function manually. But replicated Actors can't be destroyed locally, so they wouldn't gain anything from it

Well They can be destroyed locally, but that wouldn't replicate to anyone else.

Only the Server has the "AUTHORITY" over that

[tender acorn]

Well, look

kinda weird thing

I add stuff for destroying, like, you know, changing material during destroying etc, and add a string to see what actor we are looking rn, but as i said in server-side its destroying properly, but in client-side its changing material, but when i wanna trace this actor, the server tells me that: "Server: "

so i guess it`s a nullptr as you said

And this only after changing material to basic, before that server knows about my "actor"

[thin stratus]

The Server probably destroyed it and that's why it can't find it anymore

The strange thing is that it doesn't seem to destroy it on the client?

[tender acorn]

Yes

[thin stratus]

I would suggest you try to reproduce this once more with a very clean setup, without any material changes or so

Because this is a very simple thing and it should work if you marked the Actor as replicated

(which you did)

[tender acorn]

The same thing

In server its ok, in client-side its alive

[thin stratus]

Just for sanity, can you open the Blueprint where you have Replicated checked and set NetLoadOnClient to false

And then try again

Just wondering, although it shouldn't make a difference

[tender acorn]

the same 🙂

i noticed one thing

[thin stratus]

Right, figured as much

[tender acorn]

after destroying it, the mesh in this BP still alive, but without collisions

*if it`s important thing

[thin stratus]

I would assume it's pretty buggy collision

For the Client

Because for the Server there is nothing blocking you

[tender acorn]

yes

[thin stratus]

Yeah that's expected if there is an object only on the Client

Stupid question but are you placing these actors by hand into the scene or are you spawning them runtime?

[tender acorn]

runtime 😄

[thin stratus]

Coooould you show me how you do that?

Because I have a feeling that you spawn it locally too

Which would mean your client has a second instance of it

[tender acorn]

could we go the voice chat just for sharing screen?

[thin stratus]

Na, sorry, it's late for me and I can't be loud anymore. Wife would kill me .P

Just screenshot it quickly

[dark edge]

@tender acornWhy are you not just spawning a replicated actor on the server?

@tender acornWhy are you not just spawning a replicated actor on the server?

[thin stratus]

They do now. I already helped in DMs and I assume they wanted to post the solution along the problem but then Discord died.

[mellow stag]

https://www.youtube.com/watch?v=RfVHSXCEcsY Getting this weird stutter replication issue if you aren't the host

[real ridge]

@thin stratus Can I ask how can I pass information about player from player state when I am in start screen not connected on server and type there name then I join to the server and want print all players in lobby but my informations won't stay there

[tender acorn]

Guys, if anyone would get the same problem, this pictures showing you how you DONT spawn actors

[tender acorn]

That`s it, smth was wrong when i tried to send

[dusky yoke]

Hey guys, is Event Begin Play replicated? I got a missile firing actor that fires missiles on a timer on BeginPlay, and its out of sync online. The firing rate is different, so Im guessing the EventBeginPlay for the client who joins after the server is different than the server's... Or maybe I have to force the timer to the clients somehow 🤔 Some google searches lead me to adding a ref to the counter in a gamemode.. Do you guys have any recommendations? 🙂

[real ridge]

maybe problem is in physics I had some.problems with it what type is missile?actor or what I think some types of blueprints can't replicate physics

[sinful tree]

Too much assertion of dominance in that video.

[dusky yoke]

It's a multiplayer projectile, so should replicate fine. Thing is, the firing is off-sync. When the client joins the server's misssiles might've fired already.

So the problem is most likely within the timer, but Im struggling to figure out how to work around it. One thing could be the WorldDeltaSeconds, which I think wont be replicated properly just out of the box? So I tried using this instead (as show in picture), but now the missiles never fire 😅 (Was trying to multiply by 1 to see if changing the value would help, but no. Using the default pin there didnt help either)

[real ridge]

and what type of object is missile

[dusky yoke]

Its run by the RealisticProjectile plugin (Multiplayer Projectile Physics)

[real ridge]

hmmm so I guess I can t help then :D if physics is ok

[dusky yoke]

Yeah I think physics are okay, its more of a timer problem I think, since its off-sync (the actor that fires the missiles fire them off-sync, which is ran by these timers)

Thanks anyway! 🙏

[real ridge]

for better understanding if u have 3 actors there u fire on 1 but on other 2 u see it delayed?

right

[dusky yoke]

Somewhat, yes

Its a missile launcher that fires missiles into the air. When the client joins, the missile launcher is firing X amount of time after the server's missiles have already been fired

[real ridge]

and are u calling fire on server

and multicast also

is reliable ticket?

[dark edge]

Missiles should be fired on server only

[dusky yoke]

Hmm, but if it fires on server only the clients wont see them though - however, same thing happens if I just make it a multicast too. Havent done this kinda stuff before, been easier with basic linetraces & replicating damage & traces that way 😅

@dark edge @real ridge Here's what I've got so far:

Hmm, the rotation needs to be fed to the server/client properly aswell, doesnt it 🤔

Havent been replicating that

[dark edge]

On a scale between the server and client agreeing that the missile spawner exists, and the server and client agreeing on the path of each individual missile, how much do you need their two views to agree?

[dusky yoke]

As close as possible. When the missiles hit the ground they explode and damage the players. Having missiles fired in all different rotations on clients and server thats gonna be pretty bad

[dark edge]

Okay then it's just a simple as a replicated missile spawner spawning replicated missiles.

On the client side, the spawner should just be sitting there looking pretty.

[dusky yoke]

Yeah 😅

[dark edge]

Start out without multicasting anything. This should be no rpcs. The spawner is a replicated actor, which spawns replicated actors, the missiles.

[dusky yoke]

Im reading this article regarding time, which could be one way to tackle the time incident, unless there's a way to go about it without making custom classes: https://medium.com/@invicticide/accurately-syncing-unreals-network-clock-87a3f9262594

[dark edge]

You're making this way harder on yourself than it needs to be. Just have the spawner, on server only, spawn missiles, which are replicated. The thing that is replicated is the fact that the missile exists. Assuming the missile movement is already replicated with whatever movement component you are using, it'll just work.

[dusky yoke]

Hahaha yeah you're saying something there! I feel a bit under depth tackling this hehe, but is this what you had in mind?

This is within the artillery itself - but if its only spawning on the server the client doesnt see the missiles

[low helm]

All replicated actors spawned on the server are also spawned on clients

[dusky yoke]

Hmm, in that case Im not replicated properly, because they only spawn on the server. I mean, the projectile (missile) is replicating itself, but its not being spawned on the clients

@low helm

[low helm]

It likely is spawning but movement code isn’t setup right so it’s not in the right place

[dusky yoke]

Hmm 🤔 Yeah I'll have to sleep on this one 😅

[low helm]

If it has "Replicates" on, and it is spawned on the server, it is spawning on the clients. Problems could include - it's not where you think it should be, or it gets deleted somehow.

[ashen stone]

I'm doing a souls like and local prediction of the roll ability (sending direction to cast it from client to server) but sometimes if the player is a small amount of distance error from where it was cast on client ir breaks everything.

Is maybe sending the position it was cast on client and on server waiting for it to match (with a small error tolerance) the right way to fix it?

Obs: on video it 400ms and 20% packet loss just to show the problem

this is really strange

[ashen stone]

It looks like a problem with TargetData "AbilityTargetDataSetDelegate" and packet loss.

[plucky prawn]

is there a good way to detect if a player is returning back to a server they left? i can think of a few options (eg storing this in player state which im saving on leave and loading on join) but i wanted to know what you guys think

[ashen stone]

You can use épic services identity

[plucky prawn]

if i have a replicated property and set it on the server via assignment (eg myThing = myNewThing) it automatically gets replicated right? or do i need to call a function after to replicate it

[ashen stone]

It is replicanted If you add on the replication list

[mellow stag]

https://www.youtube.com/watch?v=RfVHSXCEcsY Getting this weird stutter replication issue if you aren't the host

[nova wasp]

almost certainly want the client to have authority over their own rotation to an extent here

otherwise they will have to wait for the server to send them their own viewmodel rotation like what I assume is happening here?

[mellow stag]

@nova wasp How would I fix this? Sorry a bit confused

[nova wasp]

have the client's machine control their rotation

instead of just reading the server value

[mellow stag]

Would that be a simple change?

[nova wasp]

probably?

[mellow stag]

Let me ss my blueprint rotation see if you notice anything

[nova wasp]

you may just need a switch on authority somewhere for all I know

or just have it use pawn control rotation

[jovial dawn]

hello there, I know it's late

I'm wondering, when I compile my server, should I include only the main level? where I need to include the menu level?, the menu level is where we choose the player.

normaly the player only joining main level and level that the player is spawn no ?

[mellow stag]

@nova wasp

Is this what you mean by use pawn control rotation

?

[elder sage]

no, I'm sure he means the input event that sets the control rotation. send a screenshot of that rq

[elder sage]

yeah that would be why, I'll bet

let me make a screenshot

[mellow stag]

Ok 🙂

[elder sage]

I literally just do this and it works without stuttering

that can go in the pawn or the controller, but the pawn is a bit easier for dealing with replication

[mellow stag]

Interesting

[elder sage]

I guess it could go either way, depending on your controller's relationship to pawns

[elder sage]

what's that for?

[mellow stag]

It's in the BP_Character_Player It updates the chars rotation

[elder sage]

unplug it and see if it works anyway

that's very likely the thing causing stuttering

[mellow stag]

Yeah that's it

[elder sage]

replicated actors have their transforms replicated as well

so basically you were setting it multiple times and it was correcting itself

[prisma snow]

I am setting up some very basic IP based multiplayer widget. Everything seems to go well (the logs show that the connection is established) but the client that joins the game, doesn't "start" the game - it gets stuck in the same level it was before

[near bison]

what's the best way to model a multiplayer game with cards?
suppose player A trades a card with player B, can we trace out an ideal scenario?

should I create a full blown class for my cards? (will need a string to represent it + anims, images for it etc)
and when I transfer a card between players, do I send just an int over the server, and then tell the client to take care of the rest?

[prisma snow]

I would say so, cards seem to be a central entity in your game, at least I'd have some data object

[prisma snow]

That depends on what the client needs to do with the information recieved

[near bison]

@prisma snow when I get a card from another player, show a cool animation, show it in my hand (i.e render my List<Card> neatly), + it has an associated sprite etc

[prisma snow]

Not want to be condescending or anything, but are you familiar first with Unreal's replication system? I feel like your questions are more general than geared towards multiplayer. You can "architect" your game in a number of ways, which is semi independent of how to replicate over the net. Generally speaking you'll have a copy of the objects in both client and server, do the important logic server-only (to avoid cheating etc) and send the results to the clients

[near bison]

I have 2+ years of experience of hardcore game dev experience with Unity + multiplayer 😛

And yes, it is more of an architecture question than MP, just needed to think out aloud

When a resource card needs to be traded, I am probably only going to send an int over the wire, but will handle rearranging of List<card> on clients @prisma snow

[raw thunder]

Hello everyone,
I am making a multi-player (listen server) ARPG with melee linetraces.
It is working well but I don't really like the flow right now:
Client press button - > server commit the skill (check if can launch, stamina, mana, etc) - > back to client for linetraces on the weapon - > apply point damage (server). There are a lot of back and forth between the server and the client... Is there a better way of doing something like this?
Or maybe it's the normal way and I'm overthinking haha?

[bitter oriole]

Yeah, do everything on client and server at the same time, predict the result locally on client and then roll back changes if needed

That'd be a more usual way

[raw thunder]

Because I need to linetrace on the client side right?

I am not able to make the linetrace on the server, it does not follow my markers on my weapon

[true grotto]

Hi there! I have a problem, i spawn a weapon(replicated actor) and try to SetOwnerNoSee, but nothing is changes. Where is my mistake?

Server function

SpawnWeapon_Implementation(TSubclassOf<AKT_BaseWeapon> InWeaponClass)
{
    const auto LWeapon = GetWorld()->SpawnActor<AKT_BaseWeapon>(InWeaponClass);

    LWeapon->SetOwner(PlayerCharacter);
    LWeapon->Mesh->SetOwnerNoSee(true);
}

[bitter oriole]

If the server is unable to do basic checks - might as well be purely client side and just tell the server the hit result

Assuming cooperative play

[raw thunder]

I have two makers (empty scene components) linetrace start and linetrace end, when I play an animation for whatever reason the server do not see them move, but the client do. It only follows the player movement on the server.

If possible I would like to do as you say, on both server and client then change if the result is different, to remove the lag

[prisma snow]

Ohh ok, nice :D
Given how Unreal's replication works, generally speaking you can architect your game almost as if it was standalone, the replication can be handled in each class. For example, if the deck of cards was an actor (AActor), it could automatically replicate its state (variables) to all clients.

I'd say that a card game falls very well into Unreal's default tools so you shouldn't need anything out of the ordinary. I'd look into this if you haven't already, it is a very good resource to learn UE's networking:

https://www.google.com/url?sa=t&source=web&rct=j&url=https://cedric-neukirchen.net/Downloads/Compendium/UE4_Network_Compendium_by_Cedric_eXi_Neukirchen.pdf&ved=2ahUKEwjlmdW28u_2AhXiUt8KHcEBBCMQFnoECAcQAQ&sqi=2&usg=AOvVaw1MXKQQnvbVzpkKgqtNQ1mU

[split sentinel]

Hey, i am working on a multiplayer game that should run on a dedicated server, but i don't know any "providers" other than playfab (but playfab needs your creditcard information and i don't have a creditcard yet. But i have paypal). Can anyone recommend me a "provider" i can upload my server build on? I will switch to playfab eventually, but for now i just need a server to test the game on

[pallid mesa]

Nitrado

[split sentinel]

isn't this a minecraft thing?

[bitter oriole]

AWS?

[real ridge]

guys I have CopyProperties in player state for copy my properties when travelling to another level and also OverrideWith when connnection problems but How to call them ? I tried it in widget by casting to player state and this function doesnt appear

i mean this I have level where I put player name and then save it in player state then I click connect to server and I am in lobby where I have to set READY BUT 😄 I dont know how to pass info from player state on first level (not on server) to second level where I am connected on server

its propably easy know anyone ?

[split sentinel]

I'll try. Hope it's easy to setup

[winged badger]

generally, you'd want a base PlayerState class holding all data that gets transferred between levels and CopyProperties implementing on it, with both your lobby and game PS inheriting

[real ridge]

its not seamless travel because I am traveling from client map (local on pc) to server ( i am connecting by execute command ip ) so i dont know how to pass info there

[real ridge]

yea

[winged badger]

that will just not work

[real ridge]

so I have to use instance to save name ?

and then load name from instance to player state on server ?

or

[winged badger]

server doesn't have a client instance of PS to copy the data from

when you do a hard travel

[real ridge]

so there is no way to make it like this

[winged badger]

any c++?

[real ridge]

I must create instance and there variables which I will put inside player state 😄 , full blueprints

I thought that some legit way "exist" for this

[winged badger]

generally, there is a good c++ place to put the sending PS data to server on hard travel in

[real ridge]

so I can try

[winged badger]

APlayerState::PostNetInit, its also the first place where its safe to send a server RPC from a PlayerState

[real ridge]

so with c++ is chance

the easiest is use instance but i dont know if its right

because instance will be local for player

and will not delete after login on server

[winged badger]

generally, a subsystem is a better way to go about it

doesn't clutter the GI, and can also take responsibility for say, loading saved player setups from a hard drive

we have significantly delayed BeginPlay (procedurally spawn an entire level before its called), so our PlayerStates even on hot join - hard travel get fully populated good 10-15 seconds before the game actually starts

you do have an alternate approach though, if the amount of data you need to send is not large

sending it via the login url string

[real ridge]

of u too smart for me because I am newbie I try to read about all this and watch some videos thank u

[winged badger]

if all you need to send is a name and few bits of data

[pallid mesa]

u can use these servers for whatever, also stranger suggestion is also valid

[winged badger]

it can be added to the login url

then server would parse that data during Login/PostLogin

[real ridge]

Now I am connecting by Ip I have local dedicated server 127.0.0.1 so you mean add it somewhere there ?

[winged badger]

you can google the syntax

i never used it so i don't know if off the top of my head

[real ridge]

just be patient with me please if I am asking dumb questions XD I will do

[winged badger]

but generally its ?data appended to the url string

[split sentinel]

But on the nitrado website, when i go to "products" and then to "gameserver", i havo to choose one for a specific game like ark or minecraft

[real ridge]

@winged badger can you help me how to cast inside player state from game mode ? I want set there name from instance

after login on server

in on post login

i dont know what use as input in object

[winged badger]

you should not be doing mulitplayer yet then 😦

[pallid mesa]

I guess you could contact them, we used nitrado in the past for our game

[real ridge]

somehow I need to learn 😄

best way is trying

[pallid mesa]

at the end of the day you'll be given a series of machines @split sentinel in which you can distribute your binaries

[split sentinel]

alright, i'll try to contact them and ask if i can upload my own game there

[pallid mesa]

not upload, but use their hosting services to host your game

in our case we contacted them and they made a deal for us

[split sentinel]

other services have matchmaking, but nitrado doesn't. How is it supposed to work with nitrado? With a server-browser ingame?

[tender acorn]

Hi all, guys

Anyone working with multiplayer project based on ALSv4(Advanced Locomotion System), and if its so, i wanna your help 😄

[real ridge]

i know i can cast there over get game state-> player array -> for each loop -> array element and inside object but i want only 1 player not all

[winged badger]

You have player controller reference on postlogin event

It has a reference to its playerstate

[crisp wraith]

Let's say I have an actor component that has an array of UObjects. For them to properly replicate. do I need to have an outer of the UObjects set to owning actor of the component or can I leave it at transient? (UE5.0)

Wondering about it, because I'll be moving the objects between different actors/owners (e.g. player drops item on the ground, so now pickable actor is owner of that uobject).

If so, what's the proper way to change outer of an UObject? I can think only of UObject::Rename and duplicating with NewObject, unless there are better ways.

If it matters, only server will be creating and marking objects as garbage.

[split sentinel]

@pallid mesa i called the support and they said that they don't do that anymore 😔

[pallid mesa]

aww buggers :(

[real ridge]

@winged badger and @fathom aspen thank u for help I did it finally

[real ridge]

I had to use instance for hard travel from client to server then RPC from server to set state from instance and thats all... 😄

Now I want ask the easiest way to print player name and status is what ? for example

Jaroslav Ready
Maroš Unready
Peter Ready
Loko Ready

structure ? or save it inside player state also or instance and then print it and append somehow ?

[fathom aspen]

^

[dusky yoke]

Hey, so my latenight testing yesterday was never going to bear fruition haha, thanks for the assistance! I wasnt even testing on the server, just simulating in the map itself. So, with a mug of coffee in my hand - when playing online the impacts & explosions are very closely matched, which is great. However, the client cant hear the missiles firing anymore, and client cant see the trajectory of the missile actors until theyre within 20 meters. Its almost like theyre not replicating until theyre within a range of the player or something? Is that a thing?

[real ridge]

and its possible to print it way I show ? in some table ?

name + status

name + status

from array

[fathom aspen]

I don't see how this is different from what you are doing already

Save name and status in PlayerState and print them whenever you want

[real ridge]

yes but I need to customize print because now i am still printing last added name only

not alll

[fathom aspen]

Append

[real ridge]

also if its done over loop

how to add in append new line ?

i kno i use append to connect name + ready but then i need make new line and print second name + status 😄

[fathom aspen]

You want to print to screen, or to a widget?

If you want to print to screen then that's already done for you, if to a widget then that's a whole different story

[real ridge]

on widget

[fathom aspen]

#umg

[real ridge]

like this

[fathom aspen]

You would need a ListView I guess

Again this is a #umg question

[real ridge]

yea thank u my friend

[dusky yoke]

Good afternoon guys. ☕ Im doing this setup to fire missiles from an actor which are running a multiplayer projectile plugin for trajectory. The missile hits on the ground are replicated pretty well, but the sound of the actor firing the missiles doesn't play, and the missiles don't load until they're within 20m of the clients, at which point it's too late 😆 This wasn't a problem before, when they spawned normally, so it must be a replication issue. The missile actor and the firing actor is set to Replicate.

Anyone know what I could be doing wrong? 🤔

[low helm]

Yes, From long distances objects will initially fail to replicate

You would need to increase their net cull distance squared

[dusky yoke]

@low helm Hmm, so I increased the value and now I see them when theyre spawning, and I can hear the missiles firing on my clients. However, the missiles disappear before colliding. Is there an issue with setting the net cull distance too high?

I set it to 6249999872,0 😅

[low helm]

No that’s not the problem

It’s a normal feature of replicated movement for something to not arrive in the right place or in the exact right time

[dusky yoke]

Hmm, its actually fine before I swap windows - replications and all looks fine on both windows, but once I swap to the server to doublecheck, and then swap back, the misssiles begin to despawn on the client once I swap back to it

I'll have to test it online and see if it's fine there 🤔

[low helm]

This is a complicated problem with about a dozen potential solutions

You may want to research Netwerk interpolation

Because servers don’t send movement information as much as you think

The clients have to do a lot of guess work as to where a projectile should actually be, especially a fast moving one

[young lily]

Sorry in advance for the long text 🙂 I have trouble replicating scores. This is how I currently implemented it:

• In my GameMode, when a player scores a point, I add a point to their PlayerState. This score is a replicated int32 property.
• After incrementing the score for the player that scored the point, I call a NetMulticast Method UpdateScores() * on the GameState which then triggers a BP Event, so I can update my UI using Blueprints.
• In the Widget I bound the Event from the GameState to a custom event which updates the score text. The Custom Event in the widget gets called, but the PlayerState seems to not update.
• I also update the scores when a new round starts. At this point the player state seems to have updated and the score count at this point is correct.
• If I play in Listen server mode, the score gets updated correctly and in time, on the client it does not until the next round begins.
  So it seems like even though I added a small delay of .2 s before updating the text, the score has not been replicated yet.

Is my approach unnecessarily complicated? I was thinking it would be simpler to just use an event that has the score in a parameter, so I don't do "1. Update Score in PS" "2. Use GameState to tell everyone the Score was updated"

[bitter oriole]

Just have your UI self update on Tick, or with a replication event for the player state's score.

[young lily]

Oh right, that would probably work 😄 Is there a way to set the tick rate so I don't update it way often? I can't seem to set it in the WBP properties

[bitter oriole]

No idea, no need to

[young lily]

Yeah, this seems to do the trick. Cheers mate

[true grotto]

Hi there! I have a problem, i spawn a weapon(replicated actor) and try to SetOwnerNoSee, but nothing is changes. Where is my mistake?

Server function

SpawnWeapon_Implementation(TSubclassOf<AKT_BaseWeapon> InWeaponClass)
{
    const auto LWeapon = GetWorld()->SpawnActor<AKT_BaseWeapon>(InWeaponClass);

    LWeapon->SetOwner(PlayerCharacter);
    LWeapon->Mesh->SetOwnerNoSee(true);
}

[bitter oriole]

Owner no see is client side, AFAIK

[true grotto]

It seems to be true. And only owner see is also only a client side?

[upbeat basin]

Is there any overhead to have a TSubclassOf as an RPC parameter? Or is it a common practice?

[fallow shadow]

My character can jump and look around but cant move as it just jitters me back into place, im using a dedicated server

Happens both on PIE and standalone

[ashen stone]

How to sync anim montage over network (like a dark souls tumble) on bad network without jittering every 2 seconds?

Is disabling network corrections while animating recommended?

The red number on log is distance between where client started the animation and server did

[young lily]

I'm wondering about something I'm seemingly having issues with. I set a replicated FString property in PlayerState on the client side in the PlayerController in BeginPlay(), and it seems not to get replicated all the time, if ever? Setting it via Server RPC it works very reliably. Are you not supposed to use replicated properties in PS for one-time/e.g. set directly after joining on the client?

as far as I understand it, replication roughly works either like this:

• server changes a replicated property
• it's repicated to the clients eventually

or

• client changes a replicated property
• the change is propagated to the server
• the rest is as above
  correct?

[prisma snow]

Just to double check, if it's C++, did you add the string to ReplicatedLifetimeProps (or something like that)?

[young lily]

Yes

[prisma snow]

Does anybody know if/how ENUMS are packed for the net?

I assume bools are packed automatically

[prisma snow]

Mmm then I am clueless, that seems fine

I'd check that all involved objects are instantiated etc

[fallow shadow]

So no matter what i do, even if i move the character in the editor the location gets snapped back to a very specific location

[raw thunder]

In my understanding the replicated variable propagate from server to client but not the other way

[prisma snow]

does it snap back always to the initial place?

[fallow shadow]

yes

[young lily]

That would explain it

[copper karma]

Hi, im making a game and im hosting a server, and my friend is supposed to join that server
"D:\epic games\Epic Games\UE_4.26\Engine\Binaries\Win64\UE4Editor.exe" "D:\UnrealProjects\PuzzlePlatforms\PuzzlePlatforms.uproject" /Game/ThirdPersonCPP/Maps/ThirdPersonExampleMap?listen -server -log i host with this ^
"D:\epic games\Epic Games\UE_4.26\Engine\Binaries\Win64\UE4Editor.exe" "D:\UnrealProjects\PuzzlePlatforms\PuzzlePlatforms.uproject" IPADRESS:7777 -game -log
and we both join with this ^

now this does not work, he joins a different session (in which he seems to be the host)
when he hosts and I join him it works perfectly fine.
can anybody help me? thanks in advance

(We are using Hamachi)

[prisma snow]

then your character movement component is not working properly. What is happening is that your character moves client-side only, and the server forces it back when applying updates.

[raw thunder]

I guess you need to rpc to server then set the variable? I don't know if there is a better way (if you want to replicate to every client's)

[fallow shadow]

well that's what i thought too but how would i fix it

i made sure that the cmc is set to replicate

[young lily]

That would be fine, I'm just trying to grok why stuff happens the way it happens 😄 I've used replicated properties in e.g. Player Pawns before without issues, but I'm thinking this worked because I might have not explicitly checked whether the code in question was running on the server or client

if it ran on the server naturally the props would get replicated

[ashen stone]

the client never changes a value to replicate

[raw thunder]

Haha yes that happens

[ashen stone]

For client to server you send RPCs

[young lily]

Perfect. Cheers! Also, I probably should have read this again: https://docs.unrealengine.com/4.27/en-US/InteractiveExperiences/Networking/Actors/Properties/ 🤦‍♂️

[near bison]

Does Multicast run on server too? Apart from all the clients? If yes, how to prevent that?

[dawn ledge]

{ ... }```

[young lily]

Yes, Multicast RPCs are executed on the server and clients. Not sure if there's a direct way, but I would check for Authority when calling

What @dawn ledge wrote 😄

[near bison]

@dawn ledge how to do this in Blueprint

is this correct?

Looks like it works for me

[real ridge]

Guys How can I create session on selected server with specific IP ?

I am just wondering how it works when someone is developing a game and they have server with ip for example 127.0.0.2 and you can connect there and play a game

I am just asking because in all turtorials on unreal engine youtube they are using sessions

but how its really works irl

[prisma snow]

You can create a session from a computer (server), and the IP will be the IP of that computer. For local testing is 127.0.0.1 (in the same computer). If you want a public IP, it will be the IP of the server.

Other clients can join your session by your public IP then

What you cannot do as far as I know, is to chose your IP

[real ridge]

I have done dedicated server like this

and joining via ip

but my question is (if I am game dev) and developing multiplayer game How I make it ? I will use dedicated server

or how

i dont understand

😄

[thin stratus]

If you want to join via IP; why sessions?

[real ridge]

I was just watching this series https://www.youtube.com/watch?v=RKx0K98pxl8&list=PLZlv_N0_O1gYqSlbGQVKsRg6fpxWndZqZ&index=4
and I see how he is working with sessions and I have feeling that he has more options with sessions

I am just curious about how its going in real life if I want develop multiplayer game I am working with dedicated server right ?

and also then server is only for joining but all job is made on clients pc they call functions and server does it

[prisma snow]

It depends on your game, your budget, etc. Many smaller games use listen servers, because dedicated servers are expensive

[real ridge]

exists some book or pdf about it ? I really want to read something more

listen server is when another player is hosting game ? yea ?

And if I use dedicated I need to run it 24/7 right?

[prisma snow]

our friend @thin stratus has an excellent UE4 network compendium. But things like cost of servers etc, you have to look for yourself

[prisma snow]

yes

[prisma snow]

if you want players to be able to play at any time, yes

[real ridge]

yes I am reading that compendium its briliant... I hope I will be as smart... one time 😄

[real ridge]

okey so if I want to try develop game with server 24/7 i need use dedicated server and then I am not working with sessions ?

right ?

or this is wrong

( i hope its okay to talk about stuff like this )

I am really curious and I dont have anyone to ask

[prisma snow]

sessions is one thing, and the way you handle servers is another. You can have sessions in listen server and dedicated server

[real ridge]

So if I am understanding, I can create sessions on dedicated server also (like 2battles in one time with different players) so its like I treid day ago when I made 2 different maps on same server but both have different port one 7777 another 7778 right ?

[prisma snow]

I guess, that surpasses my knowledge and experience 😄

[real ridge]

ah 😄 but anyway thank u but maybe one another question maybe u will know how it works then if I will have dedicated server to host games how I know what part of folders and files must be stored on server to run it.

and one more XDD I did dedicated server but folder has maybe 24 GB what is really really much If I realize I dont have anything there no textures only 2 maps with default characters , maybe I can something delete there or ?

Imagine to have to download game where 24 gb is nothing

and 60 gb are textures

[boreal wadi]

Double checking something before I start writing it. If I'm using the method to client side predict movement actions like sprinting or sliding with a custom movement component in order to replicate the animation states of those actions I still need some replicated booleans on my CMC so that I can pull from those in the anim bp correct?

[young lily]

Regarding this I've come across this article earlier: https://docs.unrealengine.com/4.27/en-US/TestingAndOptimization/PerformanceAndProfiling/ReducingPackageSize/

[real ridge]

👌

[brave solar]

Is only relevant to owner not a thing for characters? Can only get them to be visible for all clients or none, spawning non-characters works fine

[grim rain]

Hello, when I try to set a boolean to decide a random enemy from the group of players it only picks the person hosting the server. any way to fix this?

[sinful tree]

There's nothing being networked here. Your host is clicking the StartMatch button. You're getting one of the players controllers, in that player controller, you're doing Get Game Instance (which would still be on the host) and setting the host's game instance IsEnemy variable to true.

[grim rain]

how would i make it select a random client?

run on owning client?

[sinful tree]

You already have it selecting a random player controller. The issue is more to do with where and how you're setting the variable. Game Instance is a bad place to store variables that need to be networked as it only exists on each client and no one, not even the server, can access other Game Instances. Further to this, if you did store it on the game instance and were to RPC values back and forth, it could be a potential place for someone to cheat. Your best bet would probably be to move it to the PlayerState if other clients need to know about the value, or in the player controller if only the server needs to handle it.

[grim rain]

Im using game instance because it selects a random player in the lobby and we switch game modes for the actual game level so i needed to communicate across that

thank btw i will look into it

[jovial dawn]

Hello

I compiled my project and created a package... but it seem that the server is lisen only on local ip

LogNet: Created socket for bind address: 0.0.0.0 on port 7777

so it's work if I connect my client to local ip

but not from external

it's there a way to bind it directly to my static ip

[young lily]

I'm fairly new to UE networking, but in general, 0.0.0.0 should be open to external connections, at least from your LAN. If your firewall/router/whatever gateway doesn't block it, you should be able to receive connections from outside your network too

[prisma snow]

Yep, with NAT routers you might need to port-forward

[jovial dawn]

ok well. my other project when I start the server it bind to my IP. I don't know why it use 0.0.0.0 on this project

[real ridge]

u want to connect from another pc ?

[jovial dawn]

I add the port-forward to 7777 in my router setting

yes I would like to test it with some friend

[real ridge]

you have to find out ip address of your pc

in cmd

[jovial dawn]

it's a static ip

so never changed

[real ridge]

you dont have dedicated server ?

[jovial dawn]

yes I have a dedicted server

[young lily]

Does your friend connect via the internet or over the same LAN as you are in?

[jovial dawn]

via internet

[real ridge]

so I had also and I could connect from my laptop to server on pc

[young lily]

If you have port forwarding set up, your friend should be able to connect via your public IP if you bind to 0.0.0.0, unless your firewall or something prevents that

[jovial dawn]

I just found it strange that for this project it bind it to 0.0.0.0 , cuz for me it's a local ip

[young lily]

0.0.0.0 is your public interface as far as your machine is concerned

[real ridge]

if you have 2 devices at home try to copy game to another then run server on first

open cmd

[young lily]

meaning, you can connect from local host addresses like 127.0.0.1, LAN addresses like 192.168.1.123

[real ridge]

type ipconfig

find IPv4 address

and try to connect to this address from another pc

u need this

i think

[jovial dawn]

ok I will try that. thank.

[young lily]

This might just give you your LAN IP, you might need to use the IP Address assigned by your ISP, which you could find out via icanhazip.com or google for "what is my ip"

[real ridge]

yea thats true

or he can find it on router somewhere

[jovial dawn]

in my router setting i port foward the 7777 port to my LAN IP

it's there a way to force to use the same port ?

I see that it's change

[prisma snow]

What is the default bandwidth limit in UE4.26? It was 10Kbps iirc but I think it was higher in later versions :)

[kindred widget]

100k if memory serves

[prisma snow]

nice, thank you. I am well under the limits then

[kindred widget]

You're not limited to that by the way. Those are project settings in ini files. Easy to edit.

[prisma snow]

Yeah I am aware, but I'd rather keep it low if possible. The Net Stat shows In/Out in Bytes (not Bits) right?

I found it weird since most times, I see bits used to talk about net bandwidth

So I assume it's 100k bits (not bytes)

[kindred widget]

Not sure about the net stats, but yeah, that setting is in bits if memory serves. Been a while since I've messed with it. 😄 Been so focused on UI stuff the last year.

[prisma snow]

Haha UMG? Nice. Thanks :D

[quasi tide]

Genuinely curious btw - if you don't mind; but what actually constitutes a "UI programmer"? Like - is it your responsibility to just wire up the UI logic or do you do slate stuff? Only reason I ask is because I've seen a few jobs with the title and I'm curious about it. Is it kind of like the separation for front-end/back-end in the web dev world?

I just feel like there is a ton of overlap with a regular gameplay programmer and UI programmer personally. So it kind of feels weird to have them as separate titles.

[fallow shadow]

Can anyone help w this?

[kindred widget]

I think that highly varies by studio. I haven't touched slate until this last week at work. My main job is just creating new UI for new gameplay stuff. I've personally implemented an awards system for the game, but I don't touch most gameplay related aspects. I still have to be able to follow them though because I generally need to know if UI bugs are from my own stuff or from data in a gameplay class. But at the same time I've done a small amount of networking and such.

[prisma snow]

I did quite a lot of UI work in Unreal, and also am a Frontend dev at work. For me, somebody specialized in UI might be good at UX, sometimes design, and understands certain principles such as component based design systems, component libraries, how to build/architect a presentation layer, sometimes graphics, shaders... as always, it's hard to categorize.
I agree that at the core we are all programmers

[quasi tide]

Sure - but there is a difference between a UI programmer and a UI designer.

[prisma snow]

Yeah, I am talking exclusively about programmers

[round star]

Are you not able to add instanced meshes from the sever at runtime? I am trying to replace an actor with an instanced version of itself but to no avail. ..not by having the server add it..or a multicast..or even have the client just do it themselves

[echo pasture]

Does anybody know if the order for clients receiving events is enforced

For example, if I have a server send event A and then event B, is it guaranteed that the client will execute A then B

[jovial dawn]

Hum weird I got this error now when I tried to connect with my client to my dedicated server

LogOnline:Warning: NULL: No game present to join for session (Game)

LogNet: Client netspeed is 100000
LogNet: Join request: /Engine/Maps/Entry?Name=Alienware-R4-FAST-E843D7184BEA539370DC899D3BDC9F76?SplitscreenCount=1
LogOnlineSession: Warning: OSS: No game present to join for session (GameSession)
LogNet: Join succeeded: Alienware-R4-FAST-E8

it seem that it join but black screen on the client

[jovial dawn]

I think the problem is the map

my game has a menu map and the main map... if I compile the server, I need only the main map for the default map ?

or I need to set the menumap as default map ?

[fathom aspen]

If they are Reliable RPCs then yes, if not then no.

[snow turret]

I’m guessing you’ve already been through RPC?

[fallow shadow]

...RPC?

[snow turret]

Using custom events to replicate, … on client (run on client), … on server (run on server), … on all (multicast).

If it’s a replication error

[echo pasture]

ah ok

[echo pasture]

also lmao, I think I just saw one of your pull requests

https://github.com/EpicGames/UnrealEngine/pull/9011/commits/d0d272b62d2ccc7419728654994fb69420f60557 this you?

[fathom aspen]

Lol, no yes

Was my #1 pull request, so no ones here mock me

[echo pasture]

hilarious

but honestly that's the type of commit I would pr too so no shame, typos embarrassingly enough are valid fixes

I kinda wanna submit a PR myself just improving the documentation on some functions

[fathom aspen]

Well considering I'm a detail oriented guy, yeah I hate typos, bad names and stuff

[fathom aspen]

Go for it

[echo pasture]

cause you know some of them will just be one sentence statements that literally explain nothing about what it actually does

[fathom aspen]

Literally. And some are /*An octree*/ if you came by it already

I kinda wanted to document some of the stuff the other day, but no, enough of this stuff heh

[boreal wadi]

Question about replication. I have an actor being spawned by the server, the actor has a replicated variable that is initialized by the server before I finish spawning it. Both clients can see the actor being spawned but only one of them can see the information from the replicated variable. I tried using RepUsing and calling the initialize function on the client but the game crashed because of the data being passed was null. How can I go about making sure when an actor is spawned both players know what the data is?

[ashen stone]

Thanks everyone for help, i managed to make root motion over network with predictions looks good finally

[mellow stag]

This is my current method on updating the player rotation

Although it creates this weird stutter effect when you are not the host

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

If I uncheck the character rotation setting it fixes the issue but then the character doesn't look up or down

So how could I use that code but make it so it uses the client as priority rather than the server?

[boreal wadi]

I think you only need to run that code on the server, in the case of listen servers I believe it should only run on tick if the actor running it is not locally controlled that way it will update the simulated proxies but replication has been bustin my ass so I could be wrong here sorry

[ashen stone]

@mellow stag don`t use set actor rotation. Use control rotation

[mellow stag]

What is that node called?

I can't find it

[ashen stone]

SetControlRotation

[boreal wadi]

its in the controller

[ashen stone]

yes

And on your character you do this:

[ashen stone]

yes

[mellow stag]

gonna try it out 🙂

[ashen stone]

And do this only on client

[mellow stag]

How would I do it only for the client?

[boreal wadi]

These objects are spawned by the server but only the client that initiated the loot box can see what data is in the pickup and the other client even though they can see the actors the data on them is invalid check the logs top left to see what I mean

Everything but the data on the actors is replicating properly. Even though the data is both replicated variable and initialized by the server

[fathom aspen]

Show the code that initiates the loot box

[fathom aspen]

initialize function on the client
If the client is doing this(No RPCs involved) then yes you're screwed. Only the server sets replicated properties for them to be replicated to other clients

[boreal wadi]

No the variable is only set by the server

[fathom aspen]

that is initialized by the server before I finish spawning it
I'm not sure how such a thing is possible, but you should Expose On Spawn the property you want to replicate and set it once the actor is spawned(On server)

[boreal wadi]

The server randomly picks a data asset based on some simple logic then spawns the actor from that data asset then passes that data asset to the actor when its initialized. All done on the authority and the data asset member variable is replicated

[boreal wadi]

Im using spawn deferred where I can run function on the asset before I finish spawning but this is a good Idea I'll give it a shot instead of initializing the data

[fathom aspen]

I see, never used that function before, so I can't tell if it's causing your problem(although I'm pretty sure it's not)

[ashen stone]

It is already replicated by unreal engine

[mellow stag]

I got it fixed, thanks

[boreal wadi]

yea its a C++ thing. Blueprint does it by default I think

[boreal wadi]

My best guess is because Im working with the Asset manager and these data assets are async loaded by each players controller something is going wrong. I tried to load with the server but nothing ended up spawning. Not much information out there about using the Asset manager in a multiplayer environment, but I'm sure they use it in fortnite so its definitely possible

[vague fractal]

Is there any good reason as to why this here

UCLASS()
class AMyActor: public AActor
{
    GENERATED_BODY()
public:
  UPROPERTY(Replicated)
  int32 MyReplicatedVar;

  void GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const override
  {
    Super::GetLifetimeReplicatedProps(OutLifetimeProps);
    
    //DOREPLIFETIME(AMyActor, MyReplicatedVar); <--- Not doing it
  }
};

Wouldn't do a hard crash ?
Like the logs will warn me, but that's about it.
I just don't really see why it is just a warning as it seems very error prone

[upbeat basin]

Is it okay to give TSubclassOf parameters on RPCs?

[thin stratus]

Should be fine, they are assets basically

[kindred widget]

I probably wouldn't unless the class is always loaded class for all machines. If it's a TSubclassOf some character that is normally loaded by softclass refs, you probably shouldn't. Else it's perfectly fine.

[silent valley]

Is there a function I can call to prompt an Actor to replicate property changes immediately?
So if I change a property I want replicated asap...

[kindred widget]

Not really. Replication prediction happens at end of frame if memory serves. You could modify the actor's net priority, but that's a slippery slope.

What is so important that a replication needs to happen immediately?

[silent valley]

in this case it's showing that Simulated Proxy is firing a weapon

it works ok, just wondering if I can improve it a bit

sometimes it doesn't pick up single shots for example

I already have specific RPCs for firing etc which are replicated via RPC, this is specifically the looping fire fx

Like I say, it works ok, would be better if I could set the bool and tell the Actor to replicate itself asap

    /** Force actor to be updated to clients/demo net drivers */
    UFUNCTION( BlueprintCallable, Category="Networking")
    virtual void ForceNetUpdate();

this might do it 🤷‍♂️

[bitter oriole]

That's not gonna work, no

Simply do not use replication for events

If you need every single data point to pick up on the client yes you actually need RPCs

[silent valley]

Yeah I wasn't clear, I actually forgot how this system worked. All the important stuff is already RPC, the replicated bool is just for looped firing sfx/particles.

Tying this visual a bit closer to the shots is what I am trying to achieve

It seems to be working anyway

Although with low second client framerate it's a bit tricky to see for sure

[kindred widget]

I know for some of those effects people use an incremented counter.

[stark tree]

Hi, I'm trying the Unreal's Collab Viewer Template, as it is out of the box. How do I find the IP of my computer so that my client device can connect to it? (over another wifi network)

[faint eagle]

I'm trying to add some multiplayer to my project but for some reason the client's character movement is fiercely stuttering, especially when I'm changing direction. I was thinking that it might be because for some reason my speed changes don't replicate but I hardcoded the speed in CMC's GetMaxSpeed and nothing changed. What might be the issue for this stuttering 🤔 ? On an empty project movement works just fine when launching multiple clients

[kindred widget]

Is your movement speed incredibly fast?

[faint eagle]

nope. 600.f

[pallid mesa]

listen server, right?

[faint eagle]

yes. movement works fine on server

[pallid mesa]

what I mean with the question is if you only observed this behaviour in a listen server setup

or if you had it aswell in a dedicated server

[faint eagle]

Actually there's even no stuttering on the client's character on other client and server instances

[pallid mesa]

so it's only the listen server sim proxy that stutters

[faint eagle]

oh I'm not even trying dedicated servers yet. I'm just starting learning multiplayer

[pallid mesa]

the server character you see from client 1

right?

[faint eagle]

no, it's the other way around. from the listen server POV the client character moves just fine, but from the client's POV his character is stuttering

[pallid mesa]

can you add more clients? and see if other clients stutter?

afaik this historical issue is only for the listen server sim proxy

[faint eagle]

I'm testing with 1 listen server and 2 clients to test authority, simulated proxy and autonomous proxy cases

[pallid mesa]

so from client 1 client 2 also stutters?

[faint eagle]

no

[pallid mesa]

or only server stutters from client 1 and client 2?

[faint eagle]

the server's character doesn't stutter at all

[pallid mesa]

okay then who stutters

[faint eagle]

only client's character is stuttering and only autonomous proxy client can see the stutter

for simulated proxies and authority roles there's no stuttering for the character

[raw thunder]

Can you check if your client has the same movement speed as the server? How are you setting the movement speed?

[pallid mesa]

well i think you are not udnerstanding what a simulated proxy is

[faint eagle]

I actually have some logic for setting max speed but I hardcoded it to see if that was the problem but apparently it wasn't

[pallid mesa]

a simulated proxy is defined as the characters that you see in your screen

(in short)

[faint eagle]

except for the character that is controlled by the players controller, isn't it?

[pallid mesa]

no, well it's contextual

you need to understand what is meant by that

tldr: the char you are controlling in your pc sees other chars

these other chars u see are sim proxies

except for the one u are controlling

which can be authority or autonomous

so everything u see in your screen that is controlled by someone else is a sim proxy

[faint eagle]

ok let me rephrase my problem then

I have client A, B and listen server LS. When moving player's character on A I can see the stutter on A. Both B and LS don't see the stutter in movement of A's character in their instances

so it's stuttering only for A and only for player character, not for B or LS characters which are also on the level right next to A's player character

the same applies for B but not for LS

[pallid mesa]

ah so A statutters in A screen?

[faint eagle]

yes

but not in B or LS screen

[raw thunder]

For me it seems the client has wrong speed data and server is correcting, that would explain the simulated proxies not suturing. I would suggest to print the speed, sometimes you think you set it correctly but you don't 😊

[pallid mesa]

yeah! what Ysure said

it seems that you are doing something wrong!

[faint eagle]

i was thinking about the same thing but i hardcoded the speed for testing purposes

[pallid mesa]

I just asked because there is a historical issue in UE4, in which the listen server sim proxy would stutter and it's unsolvable unless you fine tune the config

[faint eagle]

i know that I am but i just want to find out what exactly 🙂

[pallid mesa]

mh rn i don't know if maxwalkspeed is being used somewhere else

but if you are getting corrections, it should be

[raw thunder]

Print it, it takes 1min

If you are setting it elsewhere maybe!

[faint eagle]

k I'll try

[raw thunder]

Are you sure you are currently using maxwalkspeed and not run or something else?

[faint eagle]

i guess so i mean I'm using default movement mode and the MaxWalkSpeed is the one that is used in PerformMovement AFAIK

[raw thunder]

Ok

If the speed it normal on client I have no idea sorry

[real ridge]

does exist some turtorial or guid how to create own subsystem ? and also questions multiplayer games like Battlefield etc are using own subsystem or subsystems of some platforms ?

[faint eagle]

okk so I added these loggings and what i've got is weird. While I was running straight client A didn't experience any stuttering and speeds were consistent for both A and LS but as I started turning left and right an obvious difference started appearing in logs so it is something about velocity. I guess I just have to find where exactly speed is changed when turning and why isn't it replicated 🤔

[nova wasp]

turnrate? braking force?

which side of the bed they woke up on?

[faint eagle]

but I'm not changing any of those

[real ridge]

guys How can I get info about server for example how many players are there if I am inside lobby ( not connected on server )

I want my game with max 2 players so I want to check if on server are 2 and then connect via execute command

[marble gazelle]

hm I guess for this you need some service to do that, that talks to the game servers. Don't think it makes sense if each client asks each server if there is space or not. Maybe the EOS can help? But I never used that, so no idea.
How ever you could join as spectator maybe and then join a team if there is a slot left

[kindred widget]

That's just session data.

[real ridge]

hmm

[mild urchin]

Hello everyone, I am making a system to change the player's material depending on the team he joins. I'm using repnotify for this, however if the first player joins, the second player joining the game won't see it's colour. Does anyone have an idea why ?

Also adding a delay makes it work for some odd reason

[little finch]

hey guys

i have a scope material

but it kinda fucks up in multiplayer

the scope shows the view from another player's scope camera

its the picture in picture style scope

how do i fix this issue

[bitter oriole]

Literally impossible to say without understanding in-depth how you implemented your scope camera

[little finch]

a 2d scene capture component

and a plane that is set with that material

so it projects onto the plane as an image

the view static mesh is the plane

[bitter oriole]

Yeah, I think your mistake is that you have a single render target for all players and then every camera renders on the same thing

[little finch]

so how do i fix that

[bitter oriole]

Probably disable cameras on other players

Since the perf cost is enormous anyway

[little finch]

ive made it so that only the owner of the scope can see the static mesh named 'view'

but it breaks when there are multiple players with scoped guns equipped

[bitter oriole]

Did you try the fix I just suggested?

[little finch]

yes that worked

but then how can i have many players having a scope equipped at once

[bitter oriole]

You probably do not want to have multiple camera scopes visible on screen at the same time if only for performance reasons - one is already a large expense

If you really do, you need as many render targets as concurrent scopes

[little finch]

server

client

as you see the client works fine, but the server scope uses the client image

[bitter oriole]

Just disable the capture on other player's weapons.

[little finch]

ok

but how

[marble gazelle]

only setting it up if the actor is controlled by the local player for example

[real ridge]

C++ vs Bp if you want develop multiolayer game for market ?

[woven sinew]

Anyone know why another actor's widget component doesn't show for a new player ?

[little finch]

ok so i found out

it is multiplayer compatible#

bbut sometimes it switches views

the servers sees what the client is meant to see and the client sees what the server is meant to see

and the viewpoints keep switching as more weapons are spawned

every time, it switches to a new one

[pallid token]

I am passing an int32 as a parameter to a Server RPC, but the value is changing on the server. What could be causing this?

[little finch]

it switches the viewpoint to the latest camera spawned in

[marble gazelle]

well maybe you should spawn less cameras, and just attach one camera to the current equipped weapon from your local player?

[marble gazelle]

c++ as it has more features^^

[real ridge]

nice ,have u some experiences with developing some multiplayer game?

[marble gazelle]

didn't ship one yet, but 'am working on one, so I'd say yes? But its simply a fact that BP doesn't have all features you could have if you use c++ \o/

[real ridge]

Yes I want to start learn and try to develop for myself because I want own server own subsystem etc

hard times incoming

[marble gazelle]

own server?

[real ridge]

yes

[rustic kraken]

I had a question

Do sessions work in case of joining public hosted servers?

and not LAN?

cause i am trying to add voice chat AND VOICE CHAT ONLY WORKS IF SESSIONS NODES ARE USED FOR HOSTING AND JOINING\

sry caps

[pseudo merlin]

hi all. I'm working on rapid fire weapons in an FPS now, rather than RPC per shot I just RPC on trigger state down or up and let each client shoot weapon using a local tick. How might I syncronize a random bullet spread in this case? thanks

did some searching and found a good disussion here #multiplayer message

[thin stratus]

Are you even doing local split screen games?

You have to keep in mind that this will always be broken in pie

If everyone has their own instance of the game they all have their own render target

But in pie you only have one asset and that is shared unless you play without single process enabled

pie = Play in Editor

[thin stratus]

Voice chat only works with that because there is a line of code checking if the person is in a session. It doesn't even matter if that's the server session

If you locally join a fake session it will also solve it

Might require CPP though

[calm hound]

@pseudo merlin What i did for my system, which seemed to work fairly well. Was I did an RPC that was BeginFire() and EndFire(), and BeginFire would send off a Random Stream - and all I did was replicate the seed between server/client on fire

https://docs.unrealengine.com/4.27/en-US/ProgrammingAndScripting/Blueprints/UserGuide/RandomStreams/

[near bison]

Is PlayerArray not available in GameState in BeginPlay? Am I supposed to wait on some other event?

[thin stratus]

It is available but there might be other playerstates still being replicated

Which might take longer than beginplay

[near bison]

What's a suggested approach to have a consistent state?

[chrome bay]

Bind to an event on the game state that is broadcast out whenever the PlayerArray changes

And listen for changes

PlayerArray will change at runtime anyway

[near bison]

There should be some built in event for when my PlayerArray is populated with the no.of players in game

This is so inconvenient

Also one question: any function I run on GameState runs on all clients?

[pallid mesa]

if you are asking if you can do multicasts in the GS, yes, you can

[near bison]

no..that's not what I'm seeing when I run a function on BeginPlay in GameState. It runs on all clients

This is in my GameState. Runs on all clients

[pallid mesa]

because begin play runs everywhere in the GS, as it exists on all clients as James pointed below

[chrome bay]

Makes sense

GameState exists on all clients

[near bison]

right right, my bad

[chrome bay]

Unfortunately networking in BP is extremely limiting

[pallid mesa]

and different

onreps for example don't work in the same way than in C++

[near bison]

How so?

[chrome bay]

aka the correct way.. still frustrating

BP will call an OnRep whenever that var is changed

Whether it's on the Server, or if the client changes it locally etc.

In C++ they are only called when a value is actually received from the server

[crisp wraith]

I'll try once again 🙂
Let's say I have an actor component that has an array of UObjects. For them to properly replicate. do I need to have an outer of the UObjects set to owning actor of the component or can I leave it at transient? (UE5.0)

Wondering about it, because I'll be moving the objects between different actors/owners (e.g. player drops item on the ground, so now pickable actor is owner of that uobject).

If so, what's the proper way to change outer of an UObject? I can think only of UObject::Rename and duplicating with NewObject, unless there are better ways.

If it matters, only server will be creating and marking objects as garbage.

• I have noticed, that if I have actor with UObjects and I collected them with another actor (e.g. picking up items from container). The UObject gets GC'ed on server, but on clients remains until the first owning actor is destroyed.

[chrome bay]

The objects can't use the component as the outer - only the actor

Client-side they will be created using the actor as the outer. But they usually cause crashes then when trying to destroy them etc.

[near bison]

this seems easy enough to take care of in Bps though

just update the var only in server context 🙂