multiplayer

[twin juniper]

?

[pallid mesa]

So ideally you can cache your player state on your char

And then access it as you like

[twin juniper]

i have the end of when projectile has hit the player in Projectile BP

and now...

maybe i could set owner to player controller?

to get player state from that?

[winter plover]

you can get the PC from the pawn too

so you dont really have to, but sure why not

it shouldnt make any difference

since you wanna score the player, not the character

[pallid mesa]

Just set the owner to whatever is more comfy for you

[pallid mesa]

Dont use that node.

[winter plover]

uhh

now you just score whatever pc comes first

not the one that necessarily did the shot

[twin juniper]

so i need then GetController?

[winter plover]

you wanna get the controller of whatever fired your projectile

[twin juniper]

yes

of the player firing it

but it all runs on server

[winter plover]

you still need the specific player controller

that represents the firing player

[pallid mesa]

Not exactly GetPlayerController gets the local controller only executed purely on the client. If executed on the server will return different things on dc server and listen server

[winter plover]

otherwise some other player is getting the score

[twin juniper]

so waht node i need

GetController is different from GetPlayerController

[pallid mesa]

GetController ()

[twin juniper]

?

k

[pallid mesa]

Yes

[winter plover]

you wanna get the controller of your set owner specifically

[twin juniper]

and theres the Projectile BP

[pallid mesa]

That one. If self is your pawn.

[twin juniper]

after it hits someone

[pallid mesa]

Yeah looks right

[twin juniper]

it will give 1 score per hit, not kill, seems legit

[pallid mesa]

XD

[twin juniper]

i could make it so killing someone gives 2 points

[winter plover]

you will need a different event for that then

[pallid mesa]

Yes

[winter plover]

after you take damage

check on whether or not you have died

and if so, pass the instigator of the damage

to properly award the kill

[twin juniper]

it works!

thanks

[pallid mesa]

Or you can reward players that hit the people

[winter plover]

or that ...

[pallid mesa]

I do that for a personal project hehehe

That depends on your game design

[twin juniper]

what i want to do - 1 point per hit (takes 5 hits to kill someone) and 2 points for kill, so you have something why you want to kill someone but not just hit him

[winter plover]

I see

[twin juniper]

and per death it takes away 2 points

[winter plover]

nvm me then

[pallid mesa]

Yeah can do aswell, just check the hp of the hit person

[twin juniper]

yep

and it fixed my scoreboard too, because points were not going for players they should be going

[pallid mesa]

Nice :) glad to help

Also something else, if you cache your playerstate in your player controller

[twin juniper]

mhmm

[pallid mesa]

You will avoid a cast

[twin juniper]

another problem xd

[pallid mesa]

And that will make the code to run faster (to sumarize)

[twin juniper]

when i get the health of player, it shows different on server and client

[winter plover]

is that a blueprint thing?

[twin juniper]

BP

[winter plover]

Because I usually dont bother caching my casts

afaik it's more of a compiler thing in c++

[twin juniper]

when i check health client sees 3, server sees 2, client sees the health but +1

[pallid mesa]

Its better to cache when you are going to use a lot a variable

[twin juniper]

maybe cuz client does that first ¯_(ツ)_/¯

[pallid mesa]

Make sure you get the appropiate health value

Because the rpc takes a lil bit to replicate

You avoid this problem by using an onRepNotify on the health variable

[twin juniper]

oh i did 0.05 seconds delay

and it fixed

it was in that Projectile BP, not in character

[pallid mesa]

Thats not a very ideal solution but if it works it works XD

And OnRep would fix it

[twin juniper]

but i dont want to go through several BP's to change 1 variable, i have my solution 😄

[pallid mesa]

Aye

If it works it works 🤷

You can refactor it later on :P

Just saying

[twin juniper]

same with fixing stuff - just get duct tape and tape it together... if it works it works ¯_(ツ)_/¯

[winter plover]

what he said

so god damn much

I am only now getting around making stuff a bit more clean

and consistent in naming lol

[twin juniper]

im trying to do it the cleanest way

[winter plover]

although you should try to build stuff in a way that's easily extendable

and not too locked down

[twin juniper]

so like everything of the 1 thing is in 1 BP, so it doesnt go to other and back

[winter plover]

ie. use loooots of interfaces

abstract as much as you can

[pallid mesa]

Usually the most efficient code is not the most reliable

So Its a balance

[winter plover]

yea

goes doubly so for any multiplayer project

because you gotta do client prediction and stuff

and it gets kinda messy

[twin juniper]

i cant decide... if player has 5 hp and 1 hit takes away 1 hp, 1 hit gives 1 point, 1 death takes away 2 points, then should for kill it give 2 or 3 points?

[winter plover]

thats a design decision

and we dont really know your game well enough for that I suppose

[twin juniper]

mhmm

[pallid mesa]

Just do what you like more :P

[twin juniper]

time for meth math

[pallid mesa]

Hehehe

[magic crest]

😃

[winter plover]

me personally I like to avoid scores

I am more of an objectives kinda guy

[twin juniper]

that game im making is a deathmatch game with few minutes on timer

[magic crest]

Quick question. A variable acquired in C++ beginPlay, returns null in BP begin play

[pallid mesa]

Im the opposite, I give points for everything

[magic crest]

da fuq

[pallid mesa]

@magic crest called the parent on BP?

[winter plover]

yea you gotta call the super

[twin juniper]

wait so my point scoring system.......

mhmm

[pallid mesa]

Right click on begin play node and click on "AddCall to parent"

[twin juniper]

i full kill = 6 points

1 death = -2

[pallid mesa]

@magic crest

[twin juniper]

4 points total

[winter plover]

If you dont call the super method it wont execute

[twin juniper]

so i will better have it on 2

[magic crest]

i know i had it at some point. one moment

[twin juniper]

i wont be able to get that game to steam

thats why i use "SELECT YOUR NAME"

thing on joined session

and for testing i always name 2 players - xd and xd1

[winter plover]

have you seen what gets on steam? :v

[twin juniper]

i wont be able cuz i dont have money im not even 16 xd

[magic crest]

BP begin play hitting before C++

da fuq is going on here?

[twin juniper]

how to open level as a host so everyone else goes with him in BP? (im using "Open Level" and "Open <Host IP>")

[magic crest]

try ServerTravel

[pallid mesa]

serverrravel

Hahah

Yeah

[magic crest]

serverGravel 😃

[pallid mesa]

Servertravel + options string

[magic crest]

don;t forget ?listen

[pallid mesa]

In BP's you need to execute a command

[twin juniper]

in execute console command?

oh

k

[pallid mesa]

Ye

[twin juniper]

and do that in GameMode?

oh wait no

i need it in UserWidget

[past totem]

Hey how would I make this work for all clients and not only the pawn owner? http://prntscr.com/iqkyna

[winter plover]

NetMulticast RPC

[past totem]

No idea what you just said lol

[winter plover]

You have to tell each client to play the animation

[past totem]

Okey how do I do that?

[winter plover]

you're working purely with blueprints right?

[past totem]

Yep

[winter plover]

https://docs.unrealengine.com/en-US/Gameplay/HowTo/Networking/ReplicateFunction/Blueprints

this should help

tl;dr an RPC is just one game instance telling another to run a function

[past totem]

Oh okey so I changed the event to multicast from client and then it worked

Thanks!

[winter plover]

a NetMulticast in specific is ther server telling ALL clients to do a thing

[past totem]

Okey got it

[twin juniper]

this doesnt work ^

the WinnerPlayer is not valid

[winged badger]

@magic crest the ReceiveBeginPlay() (BlueprintImplementableEvent with blueprint DisplayName BeginPlay) is called from AActor::BeginPlay(), which is in turn called from your Super::BeginPlay()

so anything in your c++ class that is above Super::BeginPlay() call will execute before blueprint

and anything else after

[magic crest]

Thanks @winged badger Btw, does your name mean 'evil'. If so, fala na pomoci 😃

[twin juniper]

can anyone help with my problem above?

[mild hull]

@twin juniper your multicast is most likely faster than the replication of winner, i would not replicate the winner but send it with the multicast

[twin juniper]

like this?

[mild hull]

y

[thin stratus]

@magic crest The Parent BeginPlay calls the BP one. So if you override it you mighr want to move the Super call to the end

Damn that's old. I should have scrolled

[ionic rivet]

Hi I'm using dedicated I'm connection with ip. I am using steam but ı don't want to use matchmaking.(Some of the available Steam Interfaces include:)

[tulip creek]

How do you guys generally handle optimization in multiplayer games? I'm hoping there's an easy system that allows me to hide certain objects from a single player but show them to other players. Like if the player disables Foliage for example, to simply hide all the foliage meshes in my level for that player alone. I know this can be done but is there any useful documentation you can point me towards?

[high heart]

@tulip creek This might not be super helpful but if the actors aren't replicated you can just hide them client side. Otherwise I think you might find network relevancy stuff useful

https://docs.unrealengine.com/en-us/Resources/ContentExamples/Networking/2_1

here's something

in my game i sometimes need things to be invisible for non-local players so I have a multicast version of SetOwnerOnlySee that I wrote. basically it just checks what machine it's on and sets visibility appropriately

dunno if that's what you're looking for. let me know

[hard lance]

Hello. Can any recommend any decent tutorials on how to create local/online multiplayer via blueprints? I really struggled to follow along with the Replication Live Training video Unreal put out. I am mostly looking to handle replication for now. Ill worry about the rest of the stuff if I ever get the hang of replication.

[lusty dust]

Can you do dedicated server with steam (advertised by steam) on BP project? Or do I need big boy code to do it? Seeing mixed results in searching online.

[high heart]

@hard lance have you looked into the Multiplayer blueprint sample?

for whatever reason i can't find a link to it. it's in the epic launcher, somewhere, but here is the docs https://docs.unrealengine.com/en-us/Resources/Showcases/BlueprintMultiplayer?utm_source=launcher&utm_medium=ue&utm_campaign=uelearn

The project itself is kind of wonky, but the logic is there in theory

I've also found that this plugin is EXCELLENT https://forums.unrealengine.com/community/community-content-tools-and-tutorials/41043-advanced-sessions-plugin

it exposes most session functionality to blueprints so you won't need C++

[lusty dust]

thanks, ive got listen host working, I can see it and join that session, but not when run it as dedicated server running on my server VM

in any case, from what ive read in the meantime here, it seems like i will have to use some big boy code

[high heart]

@lusty dust I'm not totally sure about your issue but I think you'd more or less need to set up a steam session on your ded the same way you would on a p2p. I believe there's a function in the advanced sessions plugin i posted

(in order to get it advertised)

[twin juniper]

I use a dedicated server, I do not want to set up sessions with "Steam Create Sessions" I want to connect with IP. I want information on SteamID, inventory and friends list, how can I do it? @thin stratus

[hard lance]

@high heart Thanks. I cant seem to find that project either. I assume its been deprecated. But I can take a look at the docs you linked. Thanks

[high heart]

@hard lance it's in the learn tab under "Gameplay Concepts"

Multiplayer Shootout is the one

still i think the advanced sessions plugin is probably better

[hard lance]

Thanks @high heart. I will take a look at that project and do some research on the advanced sessions plugin too when the time comes. I haven't hooked up a plugin yet

[nova ermine]

hey guys so i have a actor that simulates physics in my level, but the client cant see it at all. I have replicate movement checked on all the components, and yet the client still can't see it. When I have simulate physics unchecked he can see it.

[verbal wave]

I have a replicated bullet, when hitting a wall it does:

1. call multitask RPC, to play a spark VFX
2. destroy itself
   Now I must add a small delay between 1) and 2), otherwise the client won't execute the RPC since it's marked as pending kill (destroyed)
   Is there a cleaner way to do this? A 0.2s delay feels kludgy

[winged badger]

you could call the multicast then TearOff

it will make it stop replicating

then you can destroy it on each machine locally

[magic crest]

@verbal wave Why not simply call server shot , do traces or whatever you need to do, have a struct with needed data, replicate it and then re-run the whole 'shot simulation' on the client once the struct replicates.

Something like this:

void WeaponClass::ServerShot_Implementation()
{
    if(trace)
    {
        HitDataStruct.HitLocation = Hit.Impact;
    }
    
    // Call manually, since it won't trigger on server
    OnRep_HitData();
}

void WeaponClass::OnRep_HitData()
{
    PlayShotEffects(HitDataStruct);
}

void WeaponClass::PlayShotEffects(HitDataStruct& HitDataStruct)
{
    SpawnParticleAtLocation(HitDataStruct.HitLocation);
}

.. and then during gameplay when Fire action is pressed, this gets triggered. You bound it to an action in playerController.

void PlayerClass::OnLeftMouseButtonPressed()
{
    ServerShot();
}

Someone correct me if I'm talking rubbish, but this is how I handle my shots. Rama's recommendation from the wiki

Works like a charm.

[verbal wave]

@magic crest my projectils are slow (grenades, spider webs etc). I can send a replicated struct to the gun or the pawn, and play effects on hit. However since the projectile has seperated actor I want to seal everything inside it.
Your methodology is awesome though! I can already think of scenarios that this can apply really well, thanks.

[magic crest]

Oooh, sorry. I wasn't aware you had projectiles. I immediately thought 'fast' bullets.

What about SetLifeSpan() ?

[verbal wave]

@winged badger I forgot TearOff, gotta try it out. Thank you

@magic crest still feels a little naughty 😃

[magic crest]

@verbal wave I saw that on udemy course, they said it exists exactly due to latency

[verbal wave]

@winged badger actually if the TearOff RPC arrives faster than PlayEffects (due to terrible network conditions), PlayEffects still wouldn't execute, right?

@magic crest makes sense. much better than delay indeed

[magic crest]

But, i'm puzzled. Are you not spawning the projectile over the network? Doesn't the projectile hit the wall on all machines?

[verbal wave]

or I can set lifespan first and set invisible / disable collisions for everything immediately

[winged badger]

and its not a RPC

[magic crest]

That's what I usually do. For pretty much everything, like equipping a wep. Spawn it hidden, start pull animation, trigger visibility, finish pulling out anim.

[winged badger]

virtual void TearOff()

at laest, i don't think it is, it just needs to stop replicating the actor

it doesn't have to notify clients about it, i believe

[verbal wave]

@winged badger then the client doesn't know it's teared off. But I can include the destroy self part in PlayEffects, that'll work

[magic crest]

@verbal wave Can you use my methodology and instead of playing effects, spawn the projectile locally with data (like direction and projectile speed) set on the server?

[winged badger]

if it doesn't it will continue simulating best it can

same as if it lagged out

[magic crest]

Or does the projectile change during flight? 😃

[winged badger]

i also tend to spawn projectiles locally, server settles if they hit anything relevant or not

[magic crest]

Yeah. All you need is quick data and then do slow animated things locally.

[winged badger]

basically, i use the Fire(Pressed) to set state EFiringState::Firing

[magic crest]

It's also a good approach to keep your visuals away from logic code in case youyr server becomes dedicated.

[winged badger]

then replicate that state

[magic crest]

so you can safely ommit the OnRep call on the server, since he doesn't need visuals displayed

[winged badger]

and Fire(Released) to set EFiringState::Idle

that way i replicate stuff only when firing state changes

[magic crest]

Exactlz, @winged badger . Just replicate states, like bools or enums and react locally

[verbal wave]

@magic crest for bullets they just play effects on clients when hit a wall. But for grenades I actually replicate their movements and handle everything server side because they may go differently because of players movement

[magic crest]

bounce of of players?

[winged badger]

grenade = replicated actor

[verbal wave]

yea

[magic crest]

i see

[winged badger]

so you just need to multicast the animation for character tossing it

and replication of grenade actor takes care of the rest

[magic crest]

Personally, I'd keep the projectile non replicated. You can assume that the character's approximation simulation will be close enough (or even better than projectiles approximation movement simulation), so local projectiles will bounce of local players.

In the fps example, if you replicate the vector and launch speed, it hits the exact location every single time. I've even played with physics simulation. It was VERY close. Had a small deviation after a 100 shots

It was mainly due to fps drops having to run 2 instances of the game on one (fairly old) machine

[reef ingot]

Has anyone used that UETOPIA Online Subsystem?

https://github.com/uetopia/ProMMO

[inland pond]

Does anyone knows a good way to save my player info data which was prepared within the main menu to get over the connected session via open <ip>? I tried so many things which werent working 😮 And of course its a multiplayer game so game instance is not a good option.

[solar halo]

PlayerState?

[graceful cave]

bit of a strange issue im dealing with regarding my dedicated server

with a lower tickrate, no RPCs are dropped for any client but there are frequent and random disconnects all around

basicaly anything under 60

even tried 1 tick as an experiment + gameplay joke and i got disconnected as a spectator

so i know its not network stress causing it

but

setting the tickrate to 120, while dropping a lot of nonreliable RPCs, resulted in 0 disconnects

what could cause a lower tickrate to disconnect players despite the overall network stability being better?

there isnt a happy medium for no dropped RPCs and no disconnects, 60 disconnects players and occasionally doesnt display kill/death messages

[inland pond]

@solar halo I have previously used the playerstate but it will be always reset after I have entered the session.

[solar halo]

Hm

[graceful cave]

@inland pond save your user settings into a struct and create a variable for that struct in the player state which can then be broken

then each value can be set by the server as a replicated variable

[solar halo]

I store stuff on PS and when I connect it's fine so idk.

http://cedric-neukirchen.net/Downloads/Compendium/UE4_Network_Compendium_by_Cedric_eXi_Neukirchen.pdf is useful also.

So for example I replicate a variable in my PS and it carries over from level to level.

[inland pond]

Yeah thats already downloaded ;P I have also tried his CopyProperties Override

@graceful cave Okay I will check. @solar halo Thats interesting I will double check if I havent made a mistake.

@solar halo replicated variables were only replicated if set on server side right?

[solar halo]

I'm pretty positive you can only replicate stuff on the server.

derp you can replicate on client, but I'm only doing Replicated on the UPROPERTY and DOREPLIFETIME(class, var);

[bitter oriole]

Replication is always from server to client

Not "on" on or the other

[inland pond]

@bitter oriole Thanks! I think this was my mistake I have made 😜

[solar halo]

That's what I was thinking, but then I remembered the Client decorator for UPROPERTY.

[inland pond]

I dont get it lol. This is within my JoinMenu. The UpdatePlayerInfo gets called within playerstate on the server.

This is the event at the player state

And this section gets called on the gamemode right at the beginning. And already here is the player name not the correct one.

[graceful cave]

create a struct like this

and in your game instance or wherever you want to set the values

make this variable

get the variable in the graph and drag this off

restore all pins

then you can properly save values to it

then you can get those values in your player state

[inland pond]

Thanks for your detailed description. Inside of the collapsed nodes I am using break. And the struct you were refering is in my case playinfo. Switching the node set Player Info with set member [...] still hasn't made my playername come into the game mode :S

[graceful cave]

actually im wrong with the last part

get a reference to your game instance in your player state

and get the struct variable from there

instead of creating a new variable in the player state

thats assuming you made the struct in the gameinstance to begin with

[inland pond]

Does it work with your setup on your machine? I cant get it to work

[graceful cave]

basically your gameinstance should look like this

and your player state should look like this

[slate veldt]

Hi all, currently working on a multiplayer game, and the player can switch between 1st and 3rd person. When this is done, we have a 1st person representation of the gun, and a third person representation, and each has child static mesh actors for the weapon attachments.
In terms of the visibility chain, the 1st person weapon should only ever be seen by the owning player (bOnlyOwnerSee) , and then we turn on and off the 3rd and 1st meshes for that player via SetOwnerNoSee appropriately when the move into and out of first person.
Currently I'm having to call the same on each of the attachments meshes too, but this seems like a lot of micromanagement
Is there any easier way to setup this visibility chain? For instance, can I just set each of the attachments owner to the appropriate gun and then SetOwnerNoSee on the weapons, at which case it can go down to the children and do the same?

Aka, just call it on the weapon and that automatically calls it on the child actors meshes

[inland pond]

@graceful cave Thanks for all the effort but its still not working. Ill give up <.<

[winged badger]

@inland pond do all your players have the same wrong name?

[inland pond]

They all have the default value from the struct

in my case "Default"

[winged badger]

you need to be on client-side exec when you fetch it

if they are setting it locally (or using Steam name)

then RPC that to the server

[inland pond]

Do you mean from the game instance or player state ?

[winged badger]

when your players enters his name, it exists only on his local machine

wherever you stored it

server can't get it directly

server can't query information from clients

[inland pond]

But I call it on the server the storage function and it also arives at the server which I have checked with a print function (Exevute on Server Only)

[winged badger]

so UpdatePlayerInfo prints the correct name?

[inland pond]

this is the function I call from my Widget with the updated player name.(Thits function lives in the PlayerState) After this function I call open <ip>and on retrieving the playerinfo on the game mode of the new session its the default name. 😮

[winged badger]

then you update it, and immediately transition maps?

[inland pond]

Yea then I call open <ip>

[winged badger]

but before you do call open IP

your client is the host

you can't set info on the server before you join it

[inland pond]

indeed ... well

Damn so this is the big mistake I have made all the time. 😮 But what can I do to get the PlayerInfo struct at OnPostLoginfrom the player currently connected...

[winged badger]

its not ready yet OnPostLogin

if you grab the PS and test if its valid directly from the event

it won't be

[inland pond]

Mhh then I need to call an event within the playerstate on beginplay and notify the game mode that a player now have a player name ready and update it to all players

And indeed the event would be needed to be called on the server

@winged badger Thanks Zlo I will try it

[inland pond]

Omg It worked! somehow begin play from playerstate get called twice but thats another problem. Nice Thanks!

[worn nymph]

@inland pond yes begin play will get called once for the client and once for the server

[terse dawn]

So, I have a question on Begin Play spawning and "owning connections" https://docs.unrealengine.com/en-us/Gameplay/Networking/Actors/OwningConnections

and RPC calls: https://docs.unrealengine.com/en-US/Gameplay/Networking/Actors/RPCs

If I spawn an actor on Begin Play, it seems it has two owners (I checked via a simple print string), the server-side and client-side pawns, server calls an RPC on that actor and it's fine, client is not. So obviously this leads me to the actor that I spawned on Begin Play to either be owned by a different client (how?), it's sever-owned (I didn't do a Is Locally Controlled or Switch Has Authority) or not likely unowned.

Basically, can anyone tell me what's going on exactly so I can wrap my head around it? I tried doing Is Locally Controlled branch before, and sure enough it did have one owner of that actor. The issue then, it didn't look the same to the other clients. But the server saw it just fine.

TL;DR: Begin play spawn looks great on both client and server. But RPCs drop from Client. How can I achieve the same thing, but ensure that I can do a ServerRPC call to that actor while maintaining the same visuals.

Any help would be greatly appreciated. Thank you.

[inland pond]

@worn nymph nice, was just needed a switch has authority 😉

[winged badger]

you can only call server RPCs on actors and components that have a UActorChannel

meaning they are attached to your PlayerController

the server versions of those actors and components can freely interact with server objects, as if it was a single player game

so you don't do GetSimulatedActor()->DoSomethingServer() on client

instead, inside one of actors/components owned by your PC you do ServerDoSomethingWithSimulatedActor()->GetSimulatedActor()->DoSomething()

word Server in example function name indicating that it is a Server RPC

Tick() and BeginPlay() happen on every actor on both client and server, independently

techniques to filter what you want to do depending if its a client/server include SwitchHasAuthority (in BP) or GetOwner()->Role == ROLE_Auhority (c++, GetOwner() not required if you're doing it from pawn or PC)

IsLocallyControlled is good only if you wanted to say, display a widget over the item you're looking at, or do something equally client-specific

and only if your PlayerPawn is accessible with self(this) or GetOwner() or GetControlledPawn()

(in other words, if you are checking IsLocallyControlled from an object owned by your PlayerController)

[high heart]

Do steam sessions expire after an amount of time? I've noticed that if I sit in an open lobby (in my game this is just a normal steam session) for an hour or so nobody can find my game. It's also possible that advertisement is just failing sometimes, but it's proven a bit tricky to test. Anybody @here have info about this?

[heavy marlin]

has anyone used the messagebus and ue4's networking at the same time?

@wild prawn ? 😄

basically i want finer control over who gets what when than ue4 networking allows, so pub/sub is perfect

@terse dawn I get around the "all server RPC's must be on the PlayerController" thing like this: https://github.com/GeorgeR/RPGBase/blob/master/Source/RPGBase/Public/ContainerInstanceAccessor.h

[hidden thorn]

If I want to update a skeletal mesh (was created in the constructor c++ and bReplicates is true) to all the player would I have to use a NetMulticast ??

//.h
UPROPERTY(VisibleAnywhere, Replicated, BlueprintReadOnly, Category = Default)
class USkeletalMeshComponent* TMesh;

//.cpp In the Player file
ARPGPlayer::ARPGPlayer()
{
    bReplicates = true;
    
    TMesh = CreateDefaultSubobject<USkeletalMeshComponent>(TEXT("Mesh"));
    TMesh->SetupAttachment(GetMesh());
}

void ARPGPlayer::GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const
{
    Super::GetLifetimeReplicatedProps(OutLifetimeProps);

    DOREPLIFETIME(ARPGPlayer, TMesh);
}

//.h
UFUNCTION(NetMulticast, Reliable, WithValidation)
void ChangeMesh(class USkeletalMesh* Mesh);

//.cpp
void UTESTing::ChangeMesh_Implementation(class USkeletalMesh* Mesh)
{
    if (Player->HasAuthority())
        Player->TMesh->SetSkeletalMesh(Mesh);
}

bool UTESTing::ChangeMesh_Validate(class USkeletalMesh* Mesh)
{
    return true;
}

[glacial hamlet]

multicast probably the easiest method, you could use OnRep / property replication but YMMV either way

[hidden thorn]

YMMV ??

Also shouldn't that be everything except the place where called obviously

[wary willow]

@hidden thorn "update sk" ?

Like the SK moving or animation?

or, switching them out

^

I see now

yeah, MC or RepNot

[hidden thorn]

I am using MultiCast as it seems easier and since I am new to networking I will try to understand the RPCs first and then use OnRep (so far I didn't had to use them)

With what I have there the servers' mesh changes but the clients' mesh doesn't not on his own screen or on the server.

[glacial hamlet]

your mileage may vary.

[hidden thorn]

That means nothing to me, what is that supposed to mean?

I've never heard that before

[glacial hamlet]

https://en.wiktionary.org/wiki/your_mileage_may_vary#Synonyms

[hidden thorn]

oh ok, I see what you mean

Just had a look on guguru

[glacial hamlet]

seems like for the mesh you'd want everyone to know asap and won't be doing it frequrently, multicast might be useful, but replication will ensure things actually stay in sync with what the server sees, which may or may not be important

[hidden thorn]

Ok

[wary willow]

Alright

Has anyone ever experienced "collision" or character offset issues as the client?

This is in VR btw, but may be applicable in other MP games

[heavy marlin]

why does no one ever participate in my fun threads: https://forums.unrealengine.com/development-discussion/c-gameplay-programming/1443897-multiplayer-exploits-and-how-to-fix-them

[magic crest]

Morning...

[night jay]

@heavy marlin Reason why is because the hacks & solutions you mention are basic networking principles which has been documented countless of times

https://github.com/MFatihMAR/Awesome-Game-Networking

[heavy marlin]

you guys might find this useful: https://forums.unrealengine.com/community/community-content-tools-and-tutorials/1443976-free-profanity-filter

@night jay they may be basic but seemingly every game that comes out has the same exploits

[night jay]

Well alot of indie devs don't do any proper network research

[heavy marlin]

funcom made a few MMO's then released conan exiles and it is/was full of exploits

same with SOE

so i dont agree

[night jay]

Then the decision was concious

[heavy marlin]

they patched them though

[night jay]

UE4 has replicated authoritive movement from the server from the get go

The 2 hacks you've mentioned would already be mitigated if you follow basic protocols for this

[heavy marlin]

yes i know i was just trying to start the conversation

[night jay]

If Conan messed up with this, that means they tried their own solution which failed

[wary willow]

https://www.amazon.com/Multiplayer-Game-Programming-Architecting-Networked/dp/0134034309

[night jay]

Golden rule is if you trust the client you gonna have cheaters

[wary willow]

This is a good book as well

[glacial hamlet]

don't forget the launch exploits The division had on PC... client authoritative ammo... cheat prevention is often overlooked

[wary willow]

Meh

TBH, you shouldnt' get too wrapped up in that

Unless you really are trying to push competitive

Cheaters are going to cheat

You won't be able to stop them

[night jay]

Which alot of MP games are

Not professional competitive

[wary willow]

No.

[night jay]

But still competitive

[heavy marlin]

im more concerned with item duplication

[wary willow]

Not every MP game is trying to be in teh competitive scene

[heavy marlin]

i mean there are so many ways to do it

[night jay]

It doesn't have to be in the competitive scene to be competitive

[wary willow]

Memory dupe is too easy

[night jay]

BEing competitive means wanting to win, nothing else

[wary willow]

?

Um no

Maybe in your language

[night jay]

Halo 1 had no competitive scene

No MLG or whatever

[wary willow]

But when someone talks "competitve" in MP games

[night jay]

It's still a competitive game

[wary willow]

we're talking eSports level

[night jay]

Then call it esports

[heavy marlin]

competitive in games means .. yeah that

[wary willow]

every game is competitive to a certain degree.

[night jay]

That's the point

[wary willow]

?

[night jay]

So you're gonna have cheaters in any competitive game

[glacial hamlet]

lol

[night jay]

Esports related or not

Or at least, attempts to cheat

[wary willow]

You're going to have cheaters regardless, who cares

That's my point

[heavy marlin]

yeah so its less about the fact people cheat, and more about how it impacts on other players

[wary willow]

If you waste too much time on things people are going to circumvent anyyway

[heavy marlin]

i dont care if someones duplicating a pot plant

[wary willow]

You are going to lose scope way too quickly

[night jay]

But just because people will be able to circumvent cheating, doesn't mean you should have no kind of security whatsoever

[heavy marlin]

omg australian book prices are horrific

[wary willow]

I never said that?

I just said, don't waste your time on it

Implement some basic stuff, move on.

[heavy marlin]

@night jay is a pedantic pete

[night jay]

Gee, thanks

[wary willow]

I had to Google that...sadly

[heavy marlin]

haha

[night jay]

Me too

[wary willow]

I thought he said Peasant

I was like..peasant, okay

But anyway, there's nothing wrong with being a worryrat

Which seems to be close enough to that word

Do people actually say pedantic

[night jay]

I've just seen cheating destroy a games' lifespan, be it competitive esports or not

[heavy marlin]

yes

[wary willow]

Like, I just said it outloud and it just sounds weird

[heavy marlin]

mootjuh my point was while we were trying to discuss how much you should worry about it you were arguing what precisely constitutes a competitive game

it was funny

[wary willow]

I don't disagree that cheating will ruin games

But, if you ever get to the level that cheating is a huge issue

Then you are probably rolling around in dollar bills

naked

[heavy marlin]

yeah thats true

[wary willow]

And if you have that kind of money

You'll be able to license out some tougher cheat prevention

[heavy marlin]

you can hire a network wizard?

[wary willow]

And/or hire out some engineers to knock it out for you

Aye

[night jay]

As a programmer you would probably not see all those dollar bills yourself though

[wary willow]

But for most on here, that's not their biggest concern. Or should it be.,

[heavy marlin]

yeah so you pay them a pittance and throw cake at them

[wary willow]

Depends, you can opt into royalty on top of salary

[heavy marlin]

while you do wheelies in your segway

[night jay]

Anyways regarding your concern regarding item duplication, same story as character movement

The server manages your inventory

[wary willow]

Yup, but also, you can just put it in the cloud 😉

[night jay]

Isn't that the cloud

[wary willow]

That's actually what I am planning to do with it.

Well, database

[night jay]

Oh yeah

[wary willow]

I'm going to make a quick check on server, to see what spawned, see what people got in their inventory, make sure it's legit. then if so, beam it up to the DB.

when they log in or if they want to server travel/go into Single Player mode, they can take what they have

[magic crest]

Hey.. which object do you guys keep responsible for loading / streaming levels? GameInstance or something else?

[bitter oriole]

Yeah, that

[magic crest]

alright

[heavy marlin]

yeah gameinstance is boss

[magic crest]

erm.. how do I forward declare a struct? I'd like to use the FLevelStreamingLoadedStatus in GameInstance, but I'm getting errors. I got it to work by including the .h needed. Is this the proper way?

the include is in MyGameInstance.h

[heavy marlin]

yes you cant forward declare a value type

only a pointer

[magic crest]

Thnx

[magic crest]

I have this thing setup by one of the designers, but I'm not too familiar with BPs so I'm not sure how this should be transfered to C++.

Currently this is on a character which is replicated. Basically, the server needs to call RepLoadLevel and then magically, this gets called on client. How do I declare the RED thing in C++ (is it a multicast dynamic delegate) and which object should it be declared on? Does the objecct need to be replicated? Is GameState a good place?

Ignore the logic (branches)

This is in details when RED thing is selected

[magic crest]

or is this just a normal RPC?

[magic crest]

Ok. I think I got it. Please, correct me if I'm wrong. The blue RepLoadLevel node is a UFUNCTION with NetMulticast and the red node is the implementation, yes?

[sterile silo]

Was just curious if you can work on a game using the pre-compiled binary version of UE4 from the Epic Games Launcher that is intended to eventually be a dedicated server based Multiplayer game.

Basically is there any challenge moving from Epic Games Launcher to Source compiled once we decide to work on Multiplayer?

[heady delta]

is there a way to get owner only properties to update to a new owner, or do I have to send them manually when to initially update the new owner

[wild prawn]

@heavy marlin message bus is not intended for multiplayer. it's primarily meant for distributed applications on the same network at this time.

you could set up something that works over the internet, especially with the TCP Messaging plug-in, but that will require some twiddling. there's currently also no way to add network endpoints programmatically.

i think you'll be better off just bending the existing Unreal networking to your needs

[twin juniper]

so many people trying to connect to my game

that the servers literally shitting the bed

lmao

[modern dome]

Does UE offert funtionality to "transfer Host" ?
In older games, when you played Multiplayer and the Host disconnected, you became the Host.

Would be useful in Coop Games

[bitter oriole]

I don't believe it does

No idea how hard it would be

[cerulean rapids]

https://answers.unrealengine.com/questions/768936/blueprint-spawning-breaks-collisionsmesh-in-multip.html

if any1 has the spare time, i would appreciate the view, thanks. this issue has halted work for 2 weeks now :/

[brittle sinew]

You would need some sort of database, but it doesn't necessarily need to be SQL

Or you could host it in a third-party service

[twin juniper]

Anyone know how to make dedi servers use all cpu cores?

It seems to only be using one

[bitter oriole]

Doesn't work like that @twin juniper

Using all cores require some serious work

[twin juniper]

I know I saw someone post something tho

like

-usemulticore

or something

[bitter oriole]

@twin juniper All game logic in UE4 is on one core only

[hidden thorn]

Is there a reason for why this is happening??

//.h
UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = Clothing)
class USkeletalMeshComponent* BottomMesh;

//.cpp
void ARPGPlayerState::ChangeMesh_Implementation()
{
    Player->GetPlayerOutfit()->ChangeMesh(Mesh, Player->BottomMesh);
}

//.h
UPROPERTY(VisibleAnywhere, Replicated, BlueprintReadOnly, Category = Character)
class ARPGPlayer* Player;

//.cpp
void URPGPlayerOutfit::ChangeMesh_Implementation(class USkeletalMesh* Mesh, class USkeletalMeshComponent* MeshComp)
{
    GEngine->AddOnScreenDebugMessage(-1, 2.0f, FColor::Green, "Change Mesh");

    //This doesn't work, it changes it on the server but not on the client
    
    Player->BottomMesh->SetSkeletalMesh(Mesh);

    //This works
    MeshComp->SetSkeletalMesh(Mesh);
}

[gloomy tiger]

Hey people!

Is open <ip>:<port> the only way to connect to a server?

[twin juniper]

@gloomy tiger APlayerController::ClientTravel()

[heavy marlin]

@wild prawn thanks for the tip, ill take another look at what I can do with the built in networking

[tawny raven]

Does anyone know how to give each client(and the host) a number and then see who has a certain number and give them a certain role in blueprints? I've already asked in #blueprint but since I can't figure out my issue I thought I'd come here

[sly basin]

@tawny raven If you're using sessions or steam sessions there's a unique id built in

[tawny raven]

I am using Steam Sessions.

[sly basin]

Get Unique Net ID will return a unique number

Get Unique Net ID From Player State is usefull too. In game state there's a player array

the index of the player array is usable but it's probably better to use unique net id I think

[tawny raven]

I'll try that and report back.

Thank you @sly basin

[graceful cave]

ive been having the same issue for a while and still havent found a good solution

when im hosting my game on a listen server, there are no disconnects

on a dedicated server, players frequently disconnect whether its hosted on a VPS or my own machine

ive been disconnected from the server on my own machine before

set the max packet size and client netspeeds really high and that didnt change anything

happens at any tickrate it seems

sometimes its a standard disconnect and other times the screen goes black and all the hud elements return N/A implying there is no owned character

[winged badger]

logs are your friend @graceful cave

[graceful cave]

the server console just says what it says during a healthy disconnect usually

sometimes it says they timed out but doesnt give any other info

[nova ermine]

hey guys so im trying to set a skeletal mesh, but the client can't see the mesh being set

Theres the target which goes into a multicast event which then goes to a run on server event.

[kindred geyser]

has anyone got any idea what may be happening here? It seems the animations aren't replicating properly outside of a certain radius of other players on the network. The character seems to be fighting with an X-Axis variable somewhere when that radius is exceeded

[twin juniper]

Hey guys, how would you link two pawns together? Like restrict their movement so that they can’t move more than some distance away from each other?

In a multiplayer game of course

On separate pcs

[nova ermine]

This is supposed to change the mesh on the weapon pickup, it is changing, but he just can't see it. It's a visual thing. The Server does everything just fine.

[winged badger]

@graceful cave and do client logs have anything to add?

@nova ermine if you are multicasting, its server event, then multicast event, never the other way around

[nova ermine]

yeah thats what I have @winged badger

[winged badger]

@kindred geyser the movement animations should be working out of the box

without any additional replication

[graceful cave]

@nova ermine put a print node here and to make sure its getting to that point

[winged badger]

too low resolution i can't read anything on it

[kindred geyser]

yeah thats what I thought - however I'm using a TurnInPlace (rather than RootMotion) system which somehow is conflicting with the character's direction when rotating. Been trying to figure this out for days now lol

[nova ermine]

@graceful cave it does, it spawns the weapon in the clients hand so I know it fully gets through it all

[graceful cave]

who is unable to see the weapon in his hand?

[nova ermine]

No they can see it spawn in there hands, but the client can't see the weapon swap onto the ground

[winged badger]

are you doing any by-hand replication @kindred geyser ?

[nova ermine]

@graceful cave

[winged badger]

because that manequin was flickering just about at the usual net update frequency

[graceful cave]

id still try putting a print node right before it changes the mesh on the ground to make sure the client prints too

should ideally see Server: and Client 1: in the console

[kindred geyser]

yeah i am passing some variables to the server manually when the turn in place takes place, which all seem to be correctly implemented as far as I can see

[winged badger]

triggering an animation by hand maybe with RepNotify?

[kindred geyser]

hmm. I will take a look. thanks for some direction.

[winged badger]

it looks like client is simulating movement and runnig the animation

but something interrupts it about 10 times per second

[kindred geyser]

what i can't understand is how it's working when within a radius that is close to other players, but outside of that zone it starts to play up

[nova ermine]

@graceful cave okay so the client doesn't print, how do I fix that?

[winged badger]

did you tweak the NetCullingDistanceSquared?

[graceful cave]

your multicast isnt being called from the server

or

[kindred geyser]

no i dont think so, will take a look

[graceful cave]

make sure every branch is checking replicated variables

the client and server may have different instances of whats being checked

[nova ermine]

do I have to set the variables to replicate?

[graceful cave]

yeah and make sure the server is setting them so all clients update

print at the start of your multicast to make sure the client gets that far

then check each branch

[nova ermine]

like all the variables? The booleans, and the object and actor refs?

[winged badger]

btw @satan you can increase the amount of stuff beeing logged with console commands like "log lognet verbose"

[graceful cave]

yep i have that set

[winged badger]

be prepared for spam, tho

[graceful cave]

yeah my logs are huge lol

hard to find anything in them

[winged badger]

you can print something from bluepint on GameInstace HandleNetworkError i think its called

that is easy to spot when you skim

like 200 x characters

and whatever logs are involved in causing it, will be just above that

[graceful cave]

i have that event in my gameinstance but it just prints the error message ingame for the client

its either ConnectionLost or the screen just goes black

without the client being aware of a disconnect

all widgets stay etc

[winged badger]

so, no "graceful" exit to main menu?

[kindred geyser]

judging by these settings, it seems this shouldn't be causing this effect

[graceful cave]

only sometimes

[winged badger]

that usually happens when a RPC targets something that doesn't exist

or when you overflow the reliable buffer

[graceful cave]

most likely the reliable buffer

[winged badger]

like multicast from a PlayerController, or a GameMode

[graceful cave]

is the reliable buffer something that can be increased?

its strange because theres literally 0 issues with listen servers

[winged badger]

i only saw it once after one of my designers decided its a good idea to add a few multicasts in MonsterBase_BP

didn't have to go farther then just removing those for a fix

but reliable buffer overflow is pretty noticable in the logs

[graceful cave]

what should i search for?

and in server or client logs?

[winged badger]

its probably red, if not definetely yellow line

server

[graceful cave]

havent seen any red in there

[winged badger]

you might not have something attached to a PC on a dedicated server

a component created in actor that can't tick on dedicated server, something like that

would be a weird design choice, but can also cause random disconnects

[graceful cave]

thats what i was thinking but it looks like everything has that checked

and its really inconsistent

i barely get disconnected at all and can go 4-5 sessions without it

[winged badger]

also, failed validate can DC

[graceful cave]

but someone else with similar ping gets it constantly

[winged badger]

or rather, will DC

[graceful cave]

failed validate as in?

[winged badger]

code implementation of server RPC has bool MyClass::MyFunction_Validate()

in addition to _Implementation

if that function returns false, it means the client's cheating, apparently

its a UFUNCTION(Server, Reliable, WithValidation, ...)

[graceful cave]

ill have to look at client logs next time it happens

just close game immediately so its at the end

its strange that it only happens on a dedicated server though

makes me think theres some net setting somewhere that listen servers ignore

for example, i couldnt get listen servers to obey the NetServerMaxTickrate setting and had to cap my framerate

as host

or non reliable RPCs would just get dropped

so it makes me wonder if theres some other setting somewhere

thats uncapped on listen servers and prevented disconnects

so far ive only changed max packet size and client netspeed

[winged badger]

@kindred geyser yep, w/e is causing it, its not there

replicating movement of attached components inheriting from USceneComponent can also cause all kinds of artefacts

[kindred geyser]

excuse my ignorance... w/e?

[winged badger]

whatever

[kindred geyser]

oh lol

yeah, I'm having trouble sourcing the issue hey. Will be onto this until it is done. Its certainly a strange occurance

thanks for your time man

[winged badger]

well, components that are attached get moved with the character normally

but if you replicate their movement as well, then you will get several sources replicating the movement of same character

[kindred geyser]

yeah i had that issue on a different project, causing double speed animations on the client

[winged badger]

and the fact that one packet was sent first, does not guarantee it will arrive first

[kindred geyser]

but that was because i replicated the variables twice

the funny thing is, on that project - this wasn't an issue lol

[winged badger]

the radius in which it happens might just be that so close some variable is below some threashold for MovementComponent to try and simulate it, so it doesn't

[kindred geyser]

hmm interesting

so perhaps i'm assuming the wrong culprit

radius might be irrelevant

[winged badger]

i'd definetely look into why its happening, and not why its happening only over 1000 or so UU away from the observer

[kindred geyser]

duly noted

[winged badger]

(mind you, this was a guess on my part, never went to read the code how MovementComponent simulates movement)

but your NetRelevancy radius is 15000 UU, and that flickering happened much closer then that

[kindred geyser]

as far as I'm aware, this system of TurnInPlace isn't the norm when it comes to rotating the character with animations... its typically done with RootMotion - so I must be missing some form of replication when the Rotate Variables are passed on

[winged badger]

well, server will definetely replicate RootMotion and correct whatever client thinks the position is

unless you turn off ReplicateMovement, i think

in which case it might rotate right, but fail to move, depending on your setup

[kindred geyser]

I know it has to be something simple I'm missing - the code that initiates all of this seems to be correct. However I've checked all the available boxes that are relevant to this situation. Obviously not everything though ugh

back to the drawing board

thanks again, Zlo

[graceful cave]

found something finally!
[2018.03.15-23.42.50:612][363]LogNet: Error: UActorChannel::ReadContentBlockPayload: ReadContentBlockHeader FAILED. Bunch.IsError() == TRUE. Closing connection. RepObj: NULL, Channel: 9
[2018.03.15-23.42.50:612][363]LogNet: Error: UActorChannel::ReceivedBunch: ReadContentBlockPayload FAILED. Bunch.IsError() == TRUE. Closing connection. RepObj: NULL, Channel: 9
[2018.03.15-23.42.50:612][363]LogNet: UNetConnection::Close: [UNetConnection] RemoteAddr: 162.248.92.183:7777, Name: IpConnection_6, Driver: GameNetDriver IpNetDriver_6, IsServer: NO, PC: BP_PlayerController_DM_C_0, Owner: BP_PlayerController_DM_C_0, Channels: 104, Time: 2018.03.15-23.42.50
[2018.03.15-23.42.50:612][363]LogNet: UChannel::Close: Sending CloseBunch. ChIndex == 0. Name: [UChannel] ChIndex: 0, Closing: 0 [UNetConnection] RemoteAddr: 162.248.92.183:7777, Name: IpConnection_6, Driver: GameNetDriver IpNetDriver_6, IsServer: NO, PC: BP_PlayerController_DM_C_0, Owner: BP_PlayerController_DM_C_0
[2018.03.15-23.42.50:612][363]LogNetTraffic: Error: UChannel::ReceivedRawBunch: Bunch.IsError() after ReceivedNextBunch 1

[winged badger]

so you are replicating null somewhere

[graceful cave]

i wonder what could be causing that to only apply to certain players though

[winged badger]

i think this means that client got rid of the object while dedicated server is still replicating the thing

[graceful cave]

heres a line before that actually
[2018.03.15-23.42.50:612][363]LogNetTraffic: Error: ReadContentBlockHeader: Stably named sub-object not found. Component: [12010]RocketProjectileServer_C_5.[12014]Sphere, Actor: RocketProjectileServer_C_5

[winged badger]

that is useful

[graceful cave]

actually yeah i found something in the blueprint that might be causing it

its just a dummy object that everyone else sees and the actual damaging rocket is created only on the client

if the owner of the server rocket is the local controller, it just tells the server to destroy it

else it multicasts the explosion and explosion sound and then destroys it

so that makes sense

its getting destroyed twice by the server technically

im surprised it doesnt crash more often lol

ok yeah every time that message appears in the log its due to that actor

[winged badger]

https://docs.unrealengine.com/en-US/Gameplay/Networking/Actors/Properties/ObjectReferences

for a (probably pretty incomplete) explanation about stable naming

i'd guess that Sphere component reference is replicated at some point, and component isn't set to replicate (or rocket isn't set to replicate)

[graceful cave]

it does replicate

what confuses me is why it doesnt generate errors every time

but heres the issue

its set to owner no see since its a dummy

and the owner just destroys it since it has nothing to do with it

but other clients need to see it explode

after the explosion it goes on to destroy it

which is where the issue is coming from

[winged badger]

and then server replicates it and boom

[graceful cave]

i really hope this is the issue anyway

cuz my game is almost done and this is the only major problem ive been trying to solve

[winged badger]

it makes sense

[graceful cave]

so changing ServerDestroy to run on ownling client instead

should deal with it the way i intended

[winged badger]

and it would be random

i think the replication wouldn't fail as long as destroyed dummy doesn't get GCed before server replication kicks in

(IsPendingKill == true) would not crash the clients connection, that is

i'd go for setting the dummy Hidden for those who don't need to see it

and destroy it on server only (replicated dummy) when its time for it to die

[graceful cave]

right im just thinking of the best way to do it

how the whole system works is

the client spawns his own rocket thats only on his client and thats what actually registers the damage

at the same time he tells the server to spawn the dummy

[winged badger]

wait, client in charge ot telling the server if it did damage?

[graceful cave]

both of them are sent a variable upon spawning with the time they spawn so when the client rocket explodes, the server checks all dummy rockets sharing the time with the client rocket and calls the blueprint i showed you

yeah it does, im not worried about cheating considering this game is just something im gonna play with friends

[winged badger]

there are other reasons other then cheating why its a bad idea to implement it like that

like client having only approximate information

[graceful cave]

yeah im aware that it can make weird things happen for the person getting hit by the rocket

getting killed by something that appeared to miss

but unless it has full ping compensation its nearly unusable

and its been pretty rare to get die to a clear miss even when playing with guys who have 150+ ping

[winged badger]

well, i'd never go for a solution like that, but its your design 😃

[graceful cave]

haha yeah id never do it in a real game but if you saw what i was making youd probably think its okay

thanks for the help, i woulda never thought to check the clientside logs

[winged badger]

yw

[inland pond]

Am I correct that If I want to use the same map for different game modes e.g (FFA or TDM) I need to copy those maps like Arena01FFA and Arena01TDM and set each to their idividual game mode via game overide? using seamless travel from Lobby into Level 😮

[twin juniper]

How do you know if your issue is related to CPU usage, or Network Bandwidth?

[glacial hamlet]

@inland pond no, you shouldn't need to copy the maps, you should be able to have a sub-level you can choose based on the game mode. The game mode override can be done via server launch arguments for a travel

[thin stratus]

@glacial hamlet @LifeArtist#2293 You can specify a GameMode on Level Load

?game=GAMEMODESHORTCODE

Where GAMEMODESHORTCODE can be specified in the Project settings and assigned to a GameMode of your choice

e.g. TDM to BP_GameMode_TDM Class

[glacial hamlet]

right, thats what I meant to point @inland pond at

[thin stratus]

Yus (:

[inland pond]

@glacial hamlet @thin stratus Thanks for you both responses. Is this is only working with the open command and not servertravel command?

[thin stratus]

ServerTravel also works

ServerTravel MAPNAME?game=GAMEMODESHORTCODE

[inland pond]

Okay thanks 😄

[twin juniper]

Anyone have a checklist of things to check if you are having network issues?

[winged badger]

define "network issues"

[twin juniper]

Left click => takes 5 seconds to process
Movement teleports you backwards
...etc

Complete disconnection

of a player

when u get > 8 players

lel

@winged badger I'm pretty sure that's all net issues

[winged badger]

what does left click do?

[twin juniper]

it shouldnt matter lol

dont zone in

on that

lol

[winged badger]

it does if its exec is local

[twin juniper]

This is all the rpcs

[winged badger]

anything with "reliable buffer overflow" in the logs?

[twin juniper]

no

im barely using it tbh

I get a ton of this though @winged badger

not the spawn actor thing, the other one above it

[winged badger]

figured

looks like your movement simulation is taking too long

8 iterations x 0.05 = 0,4 < 0,406

but i never took apart a MovementComponent so can't really help you with why

[twin juniper]

@winged badger Another issue is that these three RPs are being called even when my player isnt moving:

SetMovementInputVectorOnServer
ServerMove
ServerUpdateCamera

https://i.imgur.com/PV9oV19.png

Look at the number of calls

its ridiculous

[winged badger]

did you add those?

[twin juniper]

No?

These are Engine functions

[winged badger]

ok

[twin juniper]

Like built into the engine

sadly

[winged badger]

it should be able to handle those

anything interesting in client logs?

[twin juniper]

No not really

[winged badger]

over what time was that profile result recorded?

[twin juniper]

@winged badger So im wondering

i had my netupdatefreq set to 18 on my player

could that have been causing hitching lol

[winged badger]

that is udner 2,5MB

which is not alot really

3 seconds worth for a decent connection

[twin juniper]

@winged badger the default is 100

[winged badger]

i tend to keep them between 2 and 10

[winter plover]

It makes perfect sense for movement calls to eat up this much data

after all you are constantly updating the player position

they are also fairly compact per individual call

[twin juniper]

https://gyazo.com/4e008a5673c0913ef19b8010f1d2e4c8

Any one what is causing this when trying to compile Developer_Editor?

[winged badger]

apparently, you are missing a file

might have better luck in #engine-source

[twin juniper]

I think I fixed it

Thanks to this post:

`[–]SheeEttinHobbyist 4 points 1 year ago
Go all the way into advanced permissions on the top level folder. Set yourself as owner. Give yourself full control. Set it to apply to folders, subfolders, and files. Set it to replace permissions on child objects (make them inherit).

That should recurse through everything and fix any permissions issues. But that's not necessarily your problem.

permalinkembedsave`

I just set my Projects folder so my windows user had "Full Control"

For some reason, I didn't have Write permissions to some files

[sly basin]

Dedicated server environment, when I allow a client to uncap framerate the server starts rubberbanding him around when connected if the framerate is really high. Is this because the clients sending packat rate is tied to framerate? Should I do something like change the trickrate on character ?

[winged badger]

NetUpdateFrequency

is how many net updates happen each second

and it definetely causes more traffic, ConsumeInputVector happens on Tick

and goes to server

it is a RPC so its not dependent on the NetUpdateFrequency tho

[twin juniper]

@winged badger how can u limit player tick rate then

to a certain value

And what's a good value?

[winged badger]

you have tick frequency for every actor

number of seconds between each actor tick

[sly basin]

I was looking at that, I'll give it a try in a few minutes

tick the actor @ 120 or something

[winged badger]

you can get movement component to tick slower

[sly basin]

independently? I was looking for it

[winged badger]

they also have tickrates

[sly basin]

Thanks I'll look again

[winged badger]

@twin juniper what's a good value? i don't know

experiment a little

[twin juniper]

It's really dumb that the FPS affects that rpc

seems poor by design

to have to restrict player fps

to save on performance

[winged badger]

techniaclly, you don't

and there is no guarantee capping movement component's tick will improve anything net-related

if you have resources to spare you can increase number of simulation iterations there

[pallid mesa]

Objectively speaking, sending less updates to the server will reduce the number of rpc calls to that function.

About client FPS's that was something tested on 4.18 and they did have an effect on server net saturation

Didnt dig enough to give a proper explanation but it does.

[sly basin]

I didn't sniff the network data but when I uncapped and the output was 300+ the issue was really obvious.

It shouldn't be too hard to track down

[pallid mesa]

Ayee

[sly basin]

I would always cap it at something sane for myself but if a client wants to uncap it would be nice to allow it

if I want to alter the tickrate on the movement component do i need to go up to the parent? I'm not seeing any settings in the detail panel on my custom class

[pallid mesa]

There are some variables related just navigate on your pawn/character details panel and check what you have there

Also in your DefaultEngine.ini

You'd like to adjust the NetServerTickRate value to fit your necesities

[sly basin]

Will do - haven't got there yet but plan on checking out the network stuff when I get closer

In the meantime this fixed it - .00833 works out to about 120 times a second

[winged badger]

120 ticks/second

[sly basin]

although I could only set it on the character itself - there was no where to only do it on the movement component

could be because it's derived from a c++ class that's derived from the base class I dunno - I'll look into it

[winged badger]

UActorComponent::SetComponentTickInterval()

[sly basin]

perfect

I'm a dummy with c++ but that I can follow 😃

[twin juniper]

there's gotta be

some sort of set of standards tho

for these things

[sly basin]

Going all the way back to Q3 engine I remember there being issues that had to be fixed when it came to framerate and networked movement. If I learn how it works and can manipulate the settings that seems fine?

I don't have enough of an understanding to talk with authority on the subject but it's probably better to leave it open ended for flexibility. What I want it to do might not be the same as what someone else wants or needs

[twin juniper]

https://www.epicgames.com/unrealtournament/forums/unreal-tournament-development/server-administration/10691-server-tick-rate

Why are people saying to increase tick rate to 60

the default is 30

But my question is:

Is this dependent on number of players? If more players, do we increase or decrease the value

[sly basin]

You want to scale it depending on number of clients or are you asking if it scales automatically?

[flat haven]

@twin juniper: tickrate is number of times per second that client/server syncs or to be more specific, sends data to each other. I don't know how it works exactly in UT, but in old HLDS servers I used to set 60 tickrate server side, as not many players would have monitors with more than 60Hz on those old days. Today, I don't think if it would be any reasonable to go over 120 in any multiplayer game (does modern monitors ever go over 120 Hz, could we even notice it for most of gameplayes?). For MMO/card game/etc. it can be waaay below 30 without any notice most of the time, but for FPS (like CS) it sounds way too few nowadays (I could propably end with 120 eventually 140 or so if I could get a few asks for that). More updates means more resources being used (especially net usage and engine simulations server side increasing cpu/gpu usage), what could end up with more costs, ie using amazon's gamelift, you could end up with more instances in use, what would increase your costs. You should balance beetween user experience and server costs. I'm sorry for writing a bit fuzzy, but I'm not familiar with UT servers, so I gave you general information about tickrate. Ah, and about limiting ticktare depending on number of players, it depends on UT implementation I am not familiar, so I can't tell you if it's possible at will (I bet it is), but it sounds like a bad idea for me, in general. I would rather end up with more instances than decreasing user experience at will.

[twin juniper]

@flat haven I am trying to attempt to get at least 50~ players on my servers.

I would need to lower it greatly I'm assuming

[flat haven]

See example of Fortnite from few months ago: https://youtu.be/SwZ_NUruGTM?t=3m30s (at 3:30). It takes ~50 updates from players per second, but sends about 20 back. It varies from ~100 to ~2 players. Imagine you begin with 30 tickrate at 10 players, and end up with like 10 at 60 players. You need to balance user experience and server costs, but I can't go in details with UT, unfortunately.

[twin juniper]

@flat haven No, this isn't for UT I was just looking for information online and found that thread.

My game is basically a multiplayer survival game. However, it starts to have massive lag when player count > 8-10~

Which is VERY bad

[hidden thorn]

So I am using NetMulticast to change a "ChildActorComponent" ActorClass which works but when I want to use AttachToComponent it doesn't work.

void ARPGPlayer::SetupPlayerInputComponent(class UInputComponent* PlayerInputComponent)
{
    // set up game play key bindings
    check(PlayerInputComponent);

    PlayerInputComponent->BindAction("TakeItem", EInputEvent::IE_Pressed, this, &ARPGPlayer::LocalChangeItem);
}

void ARPGPlayer::LocalChangeItem()
{
    if (HasAuthority())
        ChangeItem();
}

//NetMulticast Method
void ARPGPlayer::ChangeItem_Implementation()
{
    LeftHand->SetChildActorClass(SomeClass);
    LeftHand->AttachToComponent(GetMesh(), FAttachmentTransformRules::SnapToTargetIncludingScale, "HoldItem");
}

bool ARPGPlayer::ChangeItem_Validate()
{
    return true;
}

So as you can see LeftHand->SetChildActorClass(SomeClass) works just fine on both server and client but the AttachToComponent doesn't, I assume I am doing something wrong and there is a right way of doing this.

I know there is a workaround, where I would move the mesh inside the bp so I don't have to change the socket but I want to understand why this isn't working.

[modern dome]

Is world rebasing working in MP?

[past totem]

How would I restart a dedicated server via the graph/a C++ function?

Or just reset the current level

@ me if you answer please

[thorn merlin]

has anyone used spatial OS yet? any opinions on that?

[past totem]

figured it out, with a plugin tho http://prntscr.com/iskjym

[thorn merlin]

@past totem it looks like there are a few other ways too - https://www.youtube.com/watch?v=QNLYliyH3e0 https://www.youtube.com/watch?v=LseY59ffKK8

[past totem]

@thorn merlin thx!

[twin juniper]

What do you guys think is the best hosting provider for multiplayer games?

I've been using Digital Ocean standard droplets.

[thorn merlin]

amazon ec2 has a lot of scaling options and locations all over the world

[twin juniper]

It's also very expensive

[past totem]

Do you guys just contact the companies with info about your game and they host it (if they want)?

[thorn merlin]

you can bring the costs down if you pay in advance, use linux - there is also this https://www.unrealengine.com/en-US/blog/discussing-multiplayer-infrastructure-with-gportal

havnt looked too much into it tho

[past totem]

I mean, to host for example a survival game for people to buy a server for

You still pay them?

[twin juniper]

@past totem ?

[past totem]

@twin juniper ?

[twin juniper]

you buy servers

no one gives u them

lol

[past totem]

I mean

https://logicservers.com/

For example for them to add my game on their site

Would it cost money?

[twin juniper]

OHHHH

OHH

I don't know

[past totem]

Because others buy it

Ahh xD

[twin juniper]

I would love to look into that though

[past totem]

I'm currently getting free servers from them for advertising xSD

I might ask them about it when I get more progress on my game

[ripe cypress]

Anyone know right off why this doesnt work on clients well it does but its real jumpy going up not smooth on server smooth

[twin juniper]

@past totem I would love to know that too to be honest

[past totem]

hmm I can ask them now rl hold on

[twin juniper]

Please do!

[past totem]

I asked him (the manager) but he aint online rn

Also I'v kinda of a random question, if you are hosting a game it's because you are interested or beacuse you are getting paid from the developers? (or both)

It sounds like they are just interested, there is also a channel to suggest games on their Discord

The problem will be just getting them interested :P Which I'm sure if the game is selling it wont be a problem

[twin juniper]

Why does battlefield 1 have a tickrate of 60 lol

When fortnite's is like 17

wew

[fringe dove]

is it possible to tell from the role/remote role whether a APlayerState is the local play's or not?

or is there a better way? (I'm wanting to avoid replication delay like you might get from Controller::PlayerState)

[fleet sluice]

@twin juniper Because that's what makes the difference between average netcode (Fortnite) and great netcode (BF). In today's world, there is no excuse to use a low tickrate, unless you're intentionally bloating the bandwidth with bullshit (i.e. servers tell the clients how each pixel on an animation should behave rather than just sending an enum representing an animation state).

[twin juniper]

NetCullDistanceSquared seems to take a decent amount of time to update. Sometimes it NEVER updates the object

[twin juniper]

Also looks like my Multicast functions are playing for ALL players, even if they are not net relevant, based on netculldistancesquared

[winged badger]

RPC is not replication @twin juniper

RPC is you explicitly calling a function over network

[twin juniper]

Isn't there a way to make RPC's only call when net relevant?

[winged badger]

its not affected by tickrate, net dormancy, net relevancy or anything else

[twin juniper]

So is there nothing you can do

It's just a helpless persuit?

[winged badger]

you could call in a Client function on the Controllers/Pawns

each one separately

and determina how relevant they are yourself

[twin juniper]

I think

Multicast functions

should automatically take into account relevancy

only call on relevant clients

[winged badger]

its not how network infrastructure works tho

[twin juniper]

It's how it should work.

There will never be a use case for why a multicast would need to be still called on clients that are not relevant.

[winged badger]

https://docs.unrealengine.com/en-US/Gameplay/Networking/Actors/ReplicationFlow

[twin juniper]

Name one usage case

For when that would be beneficial

[winged badger]

and

say you multicast from a GameState

or a PlayerState

a chat update perhaps?

[twin juniper]

You don't use multicast for that

You can just loop through PlayersArray and call client RPCs on them

[winged badger]

objective updated animation

world event started

there are cases where you don't want multicasts filtered by their distance to some actor

especially if multicast happens in an actor that doens't really have a physical state

so its location is really not relevant

personally i think only purpose of multicasts is to notify users of something (animation, UI update, play sound)

[cyan light]

oh

[winged badger]

only movement should send RPCs on Tick and as it happens, does that out of the box

[cyan light]

thought you meant multicast delegates

rather than rpcs / property sync

[winged badger]

in #multiplayer its usually NetMulticast 😄

[cyan light]

😃

[wary willow]

@fleet sluice OSS UWorks OSS UWorks OSS UWorks

[fleet sluice]

✅

That will definitely be a multicast

[winged badger]

notifying all users Victor is happy?

[manic pine]

netrelevancy multicast would be nasty

maybe as a ufunction option

[winged badger]

each would need to have an attached IsNetRelevant

[manic pine]

thats in the actor class already

[fleet sluice]

Notifying all customers when OSU is ready ^^

[winged badger]

yep, and you'd need this per function

[manic pine]

yeah but presumably the internal implementation of netmulticast just iterates through playercontrolelrs

and could just as easily do a 'is net relevant for' before calling

for each

but yeah, you could almost as easily do it yourself, so no biggie

[fleet sluice]

It should, but that's not how it works

Internally, multicasts are broadcast to anyone regardless of relevancy

The relevancy check is done locally, on each client, AFTER they get the multicast'ed call

[manic pine]

ye we were speaking hypothetically

as in, it would be easy to implement

[fleet sluice]

I'm saying it's not

I've seen the code

[manic pine]

oh?

[fleet sluice]

Spent the last month digging through someone else's shit in the NetDriver and its associated classes

[manic pine]

hmm

[fleet sluice]

There are even comments about how "things are like this because X but should be like Y"

[manic pine]

i always imagined it went thorugh each server playercontroller and found the relevant actor channel

sad

well net multicasts are for visual fx anyway

[winged badger]

and you can usually piggyback whatever you'd use them for when you're replicating some state

[manic pine]

yah, onrep is my dearest of friends

[winged badger]

like setting FireState::Reloading on the server and using its OnRep t trigger reloading annimation

[manic pine]

speaking of, i had a nasty onrep problem a few days ago

with onrep(mycustomstruct)

sorry, onrep(myoldcustomstruct)

it didnt fill in the previous values in myoldcustomstruct

only the actual replicated var in struct

i did string logs in all the constructors and operators and found that it first ran copyconstructor with correct values... but then ran regular constructor and passed that to the onrep

like it was deliberately trying to sabotage me

this onrep(oldvalue) thing isnt documented at all

[winged badger]

gotta love those undocumented caveats

[manic pine]

i couldnt even find the code, because its all generated

what it should have done was obviously copyconstruct old value, set new replicated var value, then pass that into onrep

instead it did a completely new struct and set replicated var value only?

witchcraft

[dire temple]

Is there a way to save and load save data to a server? I have an avatar with custom variables to morph the character, there are over 100 variables. I am using an SQL server for multiplayer (think MMO), instead of saving and loading over 100 variables to the sql table, is there a way I can write/read a SaveData variable?

[winged badger]

save data is where? client?

[manic pine]

fire them all into binary field mebbeh

long as you dont plan on changing the order of the vars in the future

[dire temple]

SaveData is on client, should update to server everytime a change is made and reflect across all other connected clients

If there is a more efficient way I am open to it, I have not yet implemented this part to the server and researching the best way

[winged badger]

the only way you can push anything to server is the ServerRPC

i don't think you'd want to push 100+ variables every time one changes tho