multiplayer

[winged badger]

UPROPERTY(NotReplicated)

or leave it without UPROP

[woeful ferry]

Thanks 😄

[timid moss]

I'm wondering if someone might be able to answer my question I had yesterday. I got no answers and I'm still stuck :/

[winged badger]

arrays use NetDelteSerialize

[timid moss]

oh

[meager spade]

@timid moss you could have asked that in #gameplay-ability-system

people there are also a lot more familiar with GAS

[timid moss]

true. I thought this was more general struct replication stuff so i posed here

[meager spade]

anyway the issue is cause you are not serializing the data

also the proper GAS way to do it is, to produce targetdata for each trace

not targetdata holding multiple traces

your handle should ultimately hold the count of traces

[timid moss]

Yeah.Thats been bothering me. But im my game bullets ricochet so ye

[winged badger]

also have a read at NetSerialization.h header

thats where Epic put the documentation

[timid moss]

I've been reading through it a little. Need to look through it more

[meager spade]

what does ricochet have to do with the target data?

bullet hits X, and ricochets to hit Y

both are unique target data

[timid moss]

Because since a target data represents a target (like a player) being hit, the target data should store the information about how the player was hit, which is why I store the hit results from the ricochets that happened.

Unless I've had the wrong mindset this whole time

[meager spade]

target data should be created at the time of the hit

[timid moss]

yeah mine does

[meager spade]

i assume you want to do something like reduce the damage if the target was hit after a ricochet

kinda thing?

[timid moss]

Oh yeah. Probably should have mentioned that

[meager spade]

thing is your bullet should know what state it is in (pre/post ricochet)

and it can just apply a gameplay effect to the tag indicating such

or pass that into a custom GameplayEffectContext

[timid moss]

well my "bullet" is all traces

not a projectile

[meager spade]

does not matter, if it has ricochet

something is calculating that

so it knows if its ricocheting or not

[timid moss]

So your basically saying that I should only send the state of the bullet (ie ricocheted 3 times) right? That should work I think the only reason I wasn't doing that is because this makes it harder for the server to verify the client's data since it's only small bits of information. If it was an array of FHitResults the server has more to work with for verification.

[wild aurora]

Hey all, I've started using p.netshowcorrections a lot more in a game with a listen server, curious in general how often you expect to see net corrections for things like dashing, sprinting, jumping, etc. I'm seeing constant corrections, but I've not much paid attention before.

Wondering how standard that is.

[timid moss]

Are you testing with a packet lag?

I rarely get any net corrections for my movements abilities even with some lag. So constant net corrections to me doesn't sound good.

I only have sprinting and jumping rn but not sure how many you might have

[wild aurora]

I'm testing with and without, even with some sprinting and dashing I see it

[oblique dagger]

Hello! I am struggling on to open two packaged clients at the same time. What happens is that the second time I open the client the first one closes off automatically. 🙄

I want to just simulate two clients by opening the same .exe twice. Is that possible?

[oblique dagger]

It was SteamVR that is limiting to only one instance of the packaged project. By disabling it in plugins fixes that.

[light smelt]

anybody has any experience with tcp sockets in unreal c++? i want my client to request data from the server and the server to send the requested data.

FIPv4Address IPAddress;
FIPv4Address::Parse(FString("localhost"), IPAddress);
FIPv4Endpoint EndPoint(IPAddress, 7787);

ListenSocket = FTcpSocketBuilder(TEXT("TcpSocket")).AsReusable();

ISocketSubsystem* SocketSubsystem = ISocketSubsystem::Get(PLATFORM_SOCKETSUBSYSTEM);
TSharedRef<FInternetAddr> InternetAddr = SocketSubsystem->CreateInternetAddr();
InternetAddr->SetIp(EndPoint.Address.Value);
InternetAddr->SetPort(EndPoint.Port);
ListenSocket->Bind(*InternetAddr);
ListenSocket->Listen(8);

this is what i found so far, but not sure if it works and also not sure how to connect to that as a client and how to send data

[ancient lily]

yet another super basic question:

• When i spawn an actor on the server only and the actor is replicated (replicated movement as well), then would this mean that clients which stand on it will have a problem with physics? Do i need to spawn actors on the server AND the client in order to get proper physics interaction with it? I tried several examples for now with small platforms, and whenever an actor is only spawned on the server, any connected client will have the falling animation while standing on it even tho the actor and all its components are set to replicated & movement replicated ~ or should this work out of the box and the problem is something else?

[kindred widget]

@ancient lily I encountered a similar issue with HISM components. Can you try setting your thing's mesh to Stationary or Static?

[ancient lily]

ive tested some other things atm .. so the approach of manually maintaining a copy of an actor on the server and client will always fail miserably

ill try stationary/static soon

[kindred widget]

My issue at least was that my CMCs were trying to teleport the character to the HISM root location when the HISM was set to I think Stationary even, maybe it was movable. I can't remember. But there's a stupid issue with the CMC not being able to resolve where it should be on a client if the object isn't static and was added via replication if the added object wasn't set to static or stationary.

Which of course amused the shit out of me, because I thought those settings were purely for lighting. 😄

[ancient lily]

well in my case its a falling tree, so it should be movable and e.g. roll down a hill as it pleases

yeah ive kinda pinpointed it now .. when the tree falls, it's collision will still stay in place for the client even tho the movement is replicated

so i can remove the collision on the client side for the part of the tree which fell

which in return means that for the felled part, a client would rely on the replicated server collision of it .. if that makes any sense at all, which is not smooth at all cause it replicates permanently and with a delay, causing the client to be stuck in a falling animation when on top of it

this actor is only spawned on the server, it replaces a temporary mesh of a tree with 2 parts, the trunk and the upper part

when the tree gets felled, the collision of the upper part (over the trunk) will stay for the client, unless it's disabled via MC - but the physics replication of the felled part gets out of sync, no matter if i enable physics on the server only or via MC

the positions match on client and server, those are replicated just fine, but only the server can interact with the mesh smootlhy

i think i need to make an easier game, this stuff is incomprehensible

[meager spade]

physics replication is not easy

and if you have never done it, you will struggle

[ancient lily]

yeah im eating dinner now but ill look for some interp replication topics after

[upper lynx]

hi. if I have a ACharacter class, and I start a "network" game, but I don't see the other player on the screen at all, what should I look for to make it work? Replicates is true, Always relevant is true.... but still can't see other players

aaaaand, it works

ignore me

[ancient badge]

Hello, can anyone tell me why this isn't working? https://blueprintue.com/blueprint/urcdt89p/
Game begins, Actor is spawned, Variables are set and replicated to other players, but not the color. Are you not supposed to use repnotify for this?

[winged badger]

that sets the material on a mesh asset

not on an instance of it

so last one that calls OnRep, sets its materials to everyone

you're supposed to replicate a FVector or FLinearColor

then access the color and set it as a parameter on a DynamicMaterialInstance

[ancient badge]

Ok, i tried something with DynamicMaterialInstance, will try that again. Thx

[ancient badge]

@winged badger With FLinearColor you mean the Variable Type "Linear Color" right?

[winged badger]

yes

DMIs take vector parameters

so whichever is more convenient

[ancient badge]

Is there any difference in setting this up for single or multiplayer except doing it in a repnotify function?

[ancient badge]

Ok i got it!

thx @winged badger

[narrow leaf]

I have reasons why I use this type of location setting. I just want to know, why is so laggy.

[kindred widget]

The simple answer is that network requires travel time, and it's not updated every single frame most likely. Network prediction, and handling as many things as you can on the client without relying on networking is a huge part of the workflow.

[narrow leaf]

Thanks for your help! Anyway its a little bit strange, because its work without lag with the replication movement. ( I use smooth sync)

[narrow leaf]

Oh thanks! I fixed my problem.

[severe tendon]

I'm very new to networking in UE4 and this feels like a simple issue to fix but any kind of support would be appreciated.

I'm trying to spawn actors (motion controllers) on a server and then set the return values back on the client and no matter what it keeps returning null/accessed none errors.

[pastel marlin]

Instead of using a rpc to set left controller and right controller mark those property as replicated

[severe tendon]

Like this?

[pastel marlin]

yep

[severe tendon]

Thanks, but still errors

wait..

Sorry 1 sec

I think that did it, thank you

[pastel marlin]

for state prefer replicated property

[severe tendon]

Yeah, its making a bit more sense now

[pastel marlin]

its easier to manage this way

use rpc for event

[devout berry]

Could someone point me to the "network prediction plugin" I keep reading about when researching GAS?
It is supposed to be on GitHub somewhere in an early state, but I could not find anything.

That's the doc yeah. but is it integrated already in the engine ? Maybe I missed that part

I think I am twisting things up. Could be a third party plugin in development somewhere that is supposed to improve upon that

[alpine root]

How would I go about disabling input on all clients from the start of a game?

[twin juniper]

is it possible to replicate to every client except the owning client?
example: lets say i fired a bullet from client 1. what i want to have is call a server RPC to spawn that bullet(Replicate=true) from client 1, then when the server runs the RPC, i want every client except client 1 to spawn that bullet

1. call ServerSpawnBullet from client 1
2. server will run the function
3. bullet will be spawned in the server
4. bullet will be replicated in all clients except the owning client(client1)
   is this possible?

[winged badger]

skip owner

but it wont work for spawning actors

unless each client just spawns that bullet locally

[twin juniper]

so i have to use rpcs instead of replication?

[winged badger]

you can replicate a SpawnTransform and Velocity for the bullet in a struct for example

but its better to MC or fastarray that

there are alternative approaches, like not spawn bullets at all

but just replicate the information for them, and let a ProjectileManager play particles for them

[timid moss]

What does it mean in NetSerialize when Ar.IsSaving() vs Ar.IsLoading(). I understand that IsSaving() means that the archive is for saving and IsLoading() means that the archive is for loading, but NetSerialize() is for replication, and I don't understand what saving and loading means in terms of replication.

So If I wanted to replicate just a basic float Value from my custom struct, all I would need to do for NetSerialize is this?```cpp
bool FFloatPropertyWrapper::NetSerialize(FArchive& Ar, UPackageMap* Map, bool& bOutSuccess)
{
if (Ar.IsSaving())
{
Ar << Value;
}

if (Ar.IsLoading())
{
    // We have updataed Value
}

bOutSuccess = true;
return true;

}```

Wait so what part is wrong about it? Your saying to take away the Ar.IsLoading() check?

[scarlet cypress]

Hey does someone have time to test play my multiplayer game with me really quick?

[winged badger]

@timid moss i suggest studying the FHitResult NetSerialize function in the engine

its an excellent example

[wild aurora]

Hey guys I'm curious if turning off "Replicate physics to autonomous proxy" on static mesh actors in a client hosted game will make much of a difference in network performance?

I know for obviously physics heavy stuff it makes a difference but I'm not seeing much about if it's just flagged on for static meshes.

[chrome bay]

It won't make a difference no.

It's typically used when you as a player are controlling a physics-based pawn, and you don't want corrections from the server to overrule your local sim.

So checked means server has authority, unchecked means owning client will ignore physics replication from Server - and assumes you are sending the physics state from the client.

[wild aurora]

Sounds good, I've always messed with it for the obvious physics replication and what not, but noticed it was on for all static geo. Glad it doesn't affect anything. Thanks!

[woven sinew]

anyone uses steamcmd on aws gamelift ?

[foggy idol]

how do i completely disable movement replication ?

I still want properties in the character replicated but no movement

just turning off movement replication works for clients but if the server moves even though his velocity doesent seem to be replicated his position is

[meager spade]

why would velocity be replicated?

[wild aurora]

I'm undoing my brain right now with a bug, so I'd like to confirm - are PlayerControllers for clients also present on the host client (server)?

I always assumed they were just without authority.

[meager spade]

yes

PlayerController is Server and owning client only

and server version of the controller is authority

client version is not

[wild aurora]

Ok perfect, so when would be the best spot for both client and server to check the PlayerController?

PossessedBy is always on the server I know, and I think BeginPlay is too early I believe (perfect world I'd do this in the controller, but not the case)

[twin juniper]

Quick question. If I had a bunch of blueprints done for a singleplayer framework, if a wrote networking and multiplayer code, would I have to make any modifications to the preexisting code?

[bitter oriole]

Probably most of it

[devout berry]

@twin juniper sorry a bit late with my reply. Do you know where to ask for that plugin (network prediction)? I am not particulary keen on using it in production but I would like to find out more about it. Or see a roadmap or info of sorts

[soft jewel]

Hey guys, I am trying to figure out the best way to save and load game for multiplayer. Can anyone help me? Does EOS cover that? Thanks

[bitter oriole]

Define what you mean

[foggy idol]

I mean when the client moves it’s not replicated but when the server moves it is just that his velocity isn’t changing on the client

[meager spade]

why would it?

you disabled the replication of movement

[foggy idol]

That’s why I’m confused

And asking if I’ve missed something

It works on all clients

[meager spade]

why are you disabling replication of movement anyway?

on the character

[foggy idol]

But the server still has his literal actor location replicated

I need to chang the position of actors locally

[meager spade]

then just teleport them

on both local client and server

[foggy idol]

And I do t want the server to correct my changes

Like on the server they would be in position a

But at position b locally

[meager spade]

but why would you want that?

or if that is not intentional, why do they end up like that?

[foggy idol]

To emulate a lobby system that keeps the local character in the center

[meager spade]

ah

i mean that should be simple

[foggy idol]

Or like I want to be able to move simulated proxies without server correction

[meager spade]

we disable CMC in the lobby

as lobby does not actually move players

[foggy idol]

O thought about doing that

Does it stop movement replication ?

[meager spade]

then turn of replicate movement

[foggy idol]

Nice

[meager spade]

in the character

[foggy idol]

Thank you

[woven sinew]

how do you install steamcmd on gamelift for a dedicated server ?

[empty bluff]

if i have an Door_Actor that replicates and has Net Load on Client = True which has a OnRep_BoolVar.
With two clients A and B, Client A is outside network relevancy and Client B within Door_Actor.
Client B opens the door using a Timeline that is run as a Multicast and as part of Finish i do a HasAuth and toggle the BoolVar.
Client A runs into area of relevancy of the Door_Actor, and sees the door flip open (as expected because i set door rotation based on the BoolVar).

All that is fine and working so far as i want it to...

Client A then runs outside the area of relevancy of the Door_Actor and rests for like 2-3 secs or so (to make sure it's updated, not sure that's necessary)

Client B then toggles the door again and this time i would expect Client A, not to see any activity on the door. However, the door flips to closed anyway, so for some reason OnRep_BoolVar runs even if Client A is outside relevancy. Question A): Is that expected? (or in other words, does network relevancy not apply to wether RepNotifies run or not?)

[meager spade]

that is not expected

and how do you know you are out of relevancy?

the door will be destroyed on the client

[empty bluff]

Finally, if Client B opens the door again, and Client A runs into the relevancy area, i would expect the OnRep_BoolVar to run and update the door to open, but it doesn't fire (i've checked with a printstring). Question B): Is that to be expected?

[meager spade]

when its not relevant

ah except stuff pre-placed in level

relevancy does appy to rep notifies

[empty bluff]

on a) i made sure the net cull distance thingie was relatively low (about 1.000.000)

[meager spade]

if B is not relevant to Door, then Door does not send updates to B

if Always Relevant is ticked

then it would

[empty bluff]

i was experimenting with the settings and decided NOT to set "Always Relevant" = True

[meager spade]

there are only a few things that would return true

[empty bluff]

if i set "Net Load on Client" = False, everything works fine

[meager spade]

    {
        return true;
    }```

otherwise it does return !GetDefault<AGameNetworkManager>()->bUseDistanceBasedRelevancy || IsWithinNetRelevancyDistance(SrcLocation);

[empty bluff]

the door was pre-placed in the level btw

[meager spade]

yes

{
    return FVector::DistSquared(SrcLocation, GetActorLocation()) < NetCullDistanceSquared;
}``` so as you can see here

[empty bluff]

ok so second piece of code should apply

[meager spade]

who owns the door?

[empty bluff]

no owner is set

[meager spade]

no one right? you don't set an owner?

[empty bluff]

it's just placed

[meager spade]

ok so the last return is what it relevant here

[empty bluff]

yes

[meager spade]

now default for bUseDistanceBasedRelevancy is true

unless you somehow changed that

so then it does the distance check

i normally test with a very small relevancy

[meager spade]

which is 1,000,000 (1000 units)

[empty bluff]

jup, same here

[meager spade]

could you make a repro project?

i am curious

[empty bluff]

hmm not easily, it has a bunch of marketplace assets

[meager spade]

actually gimme sec

let me just make a quick test actor

with a bool

[empty bluff]

great thx, much appreciated

[meager spade]

i don't do BP networking much (all C++)

but it should be no different

[empty bluff]

i don't do C++ networking at all (yet), but do some C++ now and then

i understand most stuff that somewhat corresponds to how c# works, and did manage to make a few things in C++, but is quite poor at it still

[meager spade]

created this little test case

when i went back into relevancy

when i left relevancy again

seems to be working just fine

[empty bluff]

yes it does seem so

i'll have to make the same test... i gotta have some brainfart somewhere

[meager spade]

yeah but this seems to be just fine, if you cant find the issue, ping me, maybe we can work it out. But it seems like something is messing it up

[empty bluff]

indeed it works as expected for me as well... so i have some other bug in my code

even tested with 2 clients

thx for the help... i'll let you know if i get stuck

[foggy idol]

so I would just use disable movement ?[Edit it works]

[bitter oriole]

Assuming I have an array that can at most store 10 items, and I need it replicated. Two versions can work for me :

• TArray that would only contain used entries (let's say valid pointers)
• Fixed C array that would contain the 10 items used or not (valid pointer or nullptr).
  Am I correct in assuming that the networking would not be affected by the decision at all ?

Asking the question in an alternate way, should I create 500 replicated properties that are C arrays of nullptrs - am I correct in assuming that no data would be transfered for these arrays ?

[kindred widget]

TArrays by default will only send what is altered. Funny enough that includes client manipulation. If you have an array of 200 items that was replicated from the server, and your client removes 50 of them from the end, and then item number 157 is changed on the server, then on the client items 151-156 and 158-200 all get added on the client as defaulted/null entries when only the one item is sent.

But like in the case of resizing the array, if you remove item 151, I believe that the new 151-199 are all rereplicated if I recall correctly.

[empty bluff]

@meager spade do you happen to know when i call a Multicast Event from the server, if it executes on all Clients no matter relevancy settings or should i expect Multicast execution to also respect relevancy settings?

[meager spade]

it does

[empty bluff]

aha, then that's my issue...

[meager spade]

iirc reliable will fire regardless (or is in Unreliable)

one of them, it maybe both..

[bitter oriole]

Right, that's what I understood. What about a C array ?

[empty bluff]

uh, well i mean if client is out of relevancy

[meager spade]

yeah

relevancy is only for props

not for RPC's

[empty bluff]

i see, that's where i had my brainfart 😛

yay, im gonna go to bed and fix tomorrow... thx for clarification

[winged badger]

unreal won't know how to replicate a c array

[bitter oriole]

Seems like it does

This replicates perfectly well @winged badger

[meager spade]

if it does replicat eit

it probably replicates the entire lot

not just what is changed

[bitter oriole]

Alright, that's kind of what I'm trying to know here

Well, specifically, I'm wondering if the initial replication of a C array full of nullptrs (the default value) requires network data

Or if the property will be skipped, as unchanged

Replicating the full data vs only part of the array is fine, array is small

Thanks for the hints !

[merry viper]

Does anyone know if you need to port forward to have listen servers work on steam? I currently have a problem where I instantly return 0 results when finding a session but can create sessions fine.
I was pretty certain that stuff would work out of the box with steamworks

[ancient badge]

Hey, just for my understanding.
If i have 2 Actors, one red and one blue, in 2 rooms with a door or something between them and i use "Mulitcast" to change the blue actor to green and open the door. Red will still see him as Blue right? And with RepNotify he will see the change only if the door opens. If it not opens at all, he will never know that he changed the color, right?

[bitter oriole]

You do not need port forward on Steam.

[merry viper]

Do you know why it would be instantly returning 0 session results when searching? I purchased a steam appid and it works until I get into standalone then it no longer even searches and returns 0 almost instantly

[bitter oriole]

There is no need to buy an id either for that purpose

You said it works until standalone - sessions do not work in editor, so what are you saying ?

It also sounds like the game launches without Steam, which you can check with shift tab - overlay should open

If you launched in Shipping, a common pitfall is that the game needs to be launched from Steam, or have an appid file in the Binaries dir

(steap overlay doesn't open in that case so it's easy to diagnose)

[merry viper]

No I mean like just for testing purposes but I might be mistaken. The game launches with steam, I can see overlay and all. I also can see my steam name and avatar on the main menu screen

steam_appid.txt is in Binaries

That is why I originally thought it was a port forward issue

[bitter oriole]

Is the player logged in ? Is it a real player with games - IIRC there are limits on what free players can do

[merry viper]

Yeah it is my main account

and the alt account has games as well

[bitter oriole]

Weird

[merry viper]

@bitter oriole I also get this but cant find anything for it LogOnline: Warning: OSS: Async task 'FOnlineAsyncTaskSteamFindLobbiesForFindSessions bWasSuccessful: 0 NumResults: 1' failed in 15.032278 seconds

[bitter oriole]

Is that with advanced sessions ?

[merry viper]

Yes

[bitter oriole]

Alright, out of ideas, sorry

[merry viper]

Thanks anyway man

[tender grove]

How can i run multiple sessions on the same server?
im making a simple multiplayer game

[tender grove]

Is there any server hosting solution that can use UE4's built in replication features for multiplayer?
and supports HTML5? (im on 4.23)

[analog plinth]

Hey so I have a child gamemode bp that isnt allowing movement for some reason.

Anyone encounter this?

[dark edge]

What do you mean?

What would the GameMode have to do with movement?

[peak sentinel]

I guess he is mixing a gamestatebase and usual gamemode

Thats why his movement is being blocked

[meager spade]

One shall not mix the bases...

[empty bluff]

@meager spade huh... funny test... try this

try run in to relevancy and then run out

[meager spade]

it wont fire right?

iirc reliable multicasts take relevancy into account

[empty bluff]

it wont fire initially no, but when inside relevancy it fires on client

when client then runs out of relevancy

...

it keeps firing

not what i expected (seems like client gets somehow registered and never gets unregistered for relevancy again)

[empty bluff]

@meager spade any chance you can confirm that observation at some point?

oh and i seem to have found the real issue... im using a bool to keep track of my Actors open/close state with a RepNotify

I have an open/close animation that takes about 1 sec, which allow Client B (with this small test relevancy distance) to run in and out in between the time where Client A switch the open/close state of the Actor

so in the scenario where i open the Actor with Client A. Runs into relevancy with Client B (he sees the Actor pop open as expected), then backs out of relevancy

i switch back to Client A, and close, open, close the Actor again. With these settings it allow Client B to see the Actor animate close and open, but miss the last close animation.

when i then run into relevancy with Client B, i dont get the RepNotify firing to pop the Actor open

(and then i have client A and B out of sync)

in the description Client A = 1 and B = 2

last 4 lines in the log you can see it flip flops on Client 2, but even when entering relevancy it doesn't fire the RepNotify (assuming it's because it was true already), but because the last thing that ran was the animation closing it before it expired from the relevancy, it's actually looking Closed on the Client A (i suspect the animation which use a timeline is running, but not updating for the now unrelevant Client).

how to solve? I think i need to post a video of this problem.. i feel im missing an important point somewhere and using an invalid pattern. Somehow it should be fairly basic and i suspect ive somehow overcomplicated things in my attempt to wrap my head around this multiplayer stuff

[twin juniper]

can someone help me i make projectiles when i shoot it works fine but its spawn 2 projectiles pls help

this is the code

[winged badger]

IsLocallyControlled wouldn't help plugged into any of those events

replicated actors replicate on their own, you don't MC their spawning

[chrome quest]

Ahh... I see.

[foggy idol]

spawn the bullet using run on server

[twin juniper]

Guys i am bit confused about steam multiplayer plugin.Is it okay to use that plugin for production ready game or do we need to pay some money for using their hosting service.Thank you.What are the max sessions that can be created by that steam multiplayer plugin??

[foggy idol]

instead of a multicast

[twin juniper]

it works but the animation dont

i tried it but the animtion still dont play

[hollow eagle]

Steam services are free, but steam does not host servers for you. They provide some degree of matchmaking, server lists, and other community features but not server hosting.

[craggy void]

Well, you need to pay a one time $100 fee to get your own app id and to be able to deploy on steam, but you can make that fee back from sales

[subtle hill]

is there a way to attach/spawn a post process volume instead of a post process i.e. I need to spawn a post process in a multiplayer game that affects only one player where I can change post process material/post process settings only on that player - so far with my experiments the regular post process component just affects all players and I cant seem to able to scale it in any way

[bitter oriole]

PP is completely local, doesn't replicate, so you simply need to apply changes locally

[vivid prawn]

Hey guys,
I have 2 characters and a car, I possessed the 1st character to the car (to drive the car) and attached the 2nd character to the car seat (Actor to Component), but the 2nd character start to jitter. (I assume due to network delay)

I tried to disable the "Replicate Movement" on the 2nd character, and it works fine, but it doesn't replicate where character looking at, is there any way i can only replicate the control rotation?

[twin juniper]

Then how can players create rooms on internet without server hosting??.

[bitter oriole]

The game developer does the hosting

At their own cost

They handle their servers, spin them up or down based on player count, and only use Steam for matchmaking / server browsing

[twin juniper]

but some youtube tutorials are creating rooms on internet without any server hosting things?.Like creating rooms on internet is like out of box from steam plugins??

[bitter oriole]

Define "room"

Also the Steam plugin does nothing the engine doesn't do already - it simply exposes the built-in features to Blueprint

[twin juniper]

It is like a session one player hosts and others join

[bitter oriole]

You need to understand that sessions != multiplayer

The engine does Steam sessions out of the box (Blueprint support with the advanced sessions plugin)

Sessions have no relation to hosting or actual multiplayer

So if you're just asking about sessions, yes, Steam does that for free

No limits that I know of

[twin juniper]

So i can create sessions and anyone can join right using advanced steam plugin??

[bitter oriole]

(Again, advanced steam sessions is just a Blueprint layer for built-in engine features)

And yes, anyone can join - assuming one of the player hosts the other one, which severely restricts which type of game you can do

[twin juniper]

Okay thanks.I will check it out.Thank you so much Stranger.

[ancient badge]

Hey, how do you tell your server that player 1 should spawn something on Location A and Player 2 something on Location B?
I tried by checking which PlayerController that player is, 0 or 1. But because the server has knowing of both playercontroller he would always to the one for 0. Is there any way to tell the Server which Player Client uses the PlayerController 0/1 ?

[marsh ember]

Does anybody know an existing way to use a relay server(All clients inclusive Server connect to the Relay) ,that i can communicate to the clients without port forwarding?

[azure hollow]

How can I build AAA leaderboards made of multiple values? Is there any useful plugin or stuff like that?

[subtle hill]

@bitter oriole It was indeed - thanks for pointing me into the right direction - it was passing the values to all players - works now.

[rose egret]

who has experience with KillCam ? when I stop playing of recod it goes back to the default map (main menu) instead of game play map.

[kindred widget]

@azure hollow What defines a AAA leaderboard? Besides the pricetag, of course.

[azure hollow]

I mean how can a game display hundred of thousand of profiles with associated stats (when showing a leaderboard)? Are they taking these data from a csv or whatever or do they make this operation inside the engine?

Because actually I'm using Playfab, but I need more stats for player and it's messy as process so I guess there must be something better to do

[kindred widget]

Personally, I hate leaderboards. Unless they're displayed from protected data that is only ever ran on your internal servers, like say Overwatch or Apex where you play on their servers and no player hosts, leaderboards are terrible. People are cheaty little shits.

[azure hollow]

But I'm working on a time attack, leaderboards are like my water haha 😄 I was trying to understand how they are made

[kindred widget]

Really depends on how you want them displayed. If you're talking game wide for every person that ever plays, probably best to upload the data to a web server somewhere and let player's games download it.

[twin juniper]

@bitter oriole So according to your point on advanced steam session,steam is not hosting any dedicated server but it is making my ip public so other people can join my local server.But i found a app called "logmeinhimachi" which is a subscription model.Then how steam can provide it for free??.So is there any pricing model on advancedsteam session.If not can i use it for a production built game.Thank you

[bitter oriole]

• Steam never does any hosting
• Steam doesn't make your IP public, it allow people to connect to your machine (using or without using IP addresses directly)
• Matchmaking (as this is called) is very easy and cheap, so there's no large cost associated to it, you could do it yourself in a few weeks of programming, and other services do it too (GOG, EOS, etc)
• There is no cost associated to this stuff, other than (for Steam) the expectation that you'll sell on Steam some day

The real cost is dedicated servers, if your game has more than 3-4 players or is competitive

[twin juniper]

So i think max no of players to join is only 2 then.

[bitter oriole]

Depends on your game, could be 6 players, could be 3. Outriders struggles with 3 players in a listen server model ; other games can go higher. 6

[twin juniper]

Do you think advanced steam session work on mobile if i have steam account

[bitter oriole]

Steam does not work on mobile

[twin juniper]

okay thank you Stranger for helping me out.

[scarlet cypress]

I never used "execute on owning client" so far.. Does it just put you on the client that will return true to "is locally controlled"?

[meager spade]

we have 8 players in listen server 😄

[bitter oriole]

Yeah, like I said, it could very well work. I would definitely do a 4v4 turn-based tactics game in listen server

A shooter, probably not

[worthy knot]

Need to use this in a repnotify function, but it wont let me, is there a way?

[bitter oriole]

Define "won't let me"

[worthy knot]

when i paste it in the rep notify function it does not appear

nor can be called in it

[meager spade]

onrep is a function

but the onrep function can call an event and run it

don't see the issue

[eternal canyon]

in blueprints funcrtions cant call async tasks

[meager spade]

nope ^ not correct

[eternal canyon]

sagde

[meager spade]

events also run on the main thread

Functions can have returns, functions must return.

[bitter oriole]

Everything does really

[meager spade]

Can't have latent in something that must return, events don't return, and can support latent.

[worthy knot]

Im using montages based on random integers, turned out for random integers to be called out correctly in all clients using repnotify is a good way ( thats what i read in a thread )

now if i use a custom event to be called from the rep notify, which will trigger the montage, will the same random number of the montage appear in all clients?

[meager spade]

its replicated so why would it not?

[worthy knot]

should i make that custom event not replicated or ROS or MC?

or client only?

[meager spade]

only server can change replicated property

Read this: https://cedric-neukirchen.net/

[worthy knot]

ill test and check

[kindred widget]

And when you're done reading it, read it again. 😄

[quartz venture]

Hey guys, I have a question that might be a little stupid. Are Post Process volumes client specific? Can I change settings (i.e add Post Process materials) that only affects one/certain clients and not others?

[ancient badge]

Anyone an idea?

[pastel marlin]

if its inherit actor

and it should since its one the map

you can replicate settings by making it replicated i think

from server to client

[winged badger]

@ancient badge override GameMode ShouldSpawnAtStartSpot function to return false

then it will not use cached starts it saved at the time of login

and your ChoosePlayerStart override can actually do its job

its c++

[ancient badge]

Sorry i don't mean the player character. A player can choose different objects, and when the game starts this objects should spawn at a different location
For both players.

[scarlet cypress]

Forgot how good the unreal documentation actually is, instead of watching hours of tutorials you really can just read that one page and know enought about multiplayer to make a first fully working game!

https://docs.unrealengine.com/en-US/InteractiveExperiences/Networking/Blueprints/index.html

[scarlet cypress]

Is it a network sin to use a lot of RPCs if you could instead do it with property replication?

Or does that not really matter a lot?

For example: Multicasting the new max walk speed instead of making the variable "max walk speed" replicated.

[kindred widget]

You want to replicate state.

For instance. If you have a client join in after another client has pressed shift, the joining client will not know that the sprinting client is sprinting and it'll jitter around wildlly if you use RPCs.

Because the newly joined client won't have that state and it won't get updated.

[scarlet cypress]

Yes that's a downside anyways

with rpc

but for the network, does it make a noticable difference?

[kindred widget]

Depends on the scenario. RPCs can remove some cpu overhead from replication checking in some cases. But unless you have a seriously huge and complex game, that kind of optimization is pointless. Otherwise in terms of bandwidth, RPC and Replication are nearly equal.

[scarlet cypress]

Okay thanks!

[kindred widget]

Also worth noting that an RPC can be sent from server even if the actor doesn't exist on client.

Common case is right after spawning. If you RPC from an actor in the same frame that you spawn that actor, the RPC will likely reach the client first and be dropped. Nothing on the client to run it on.

[scarlet cypress]

I see

Had a similar thing with playing the death sound with an rpc

Because the pawn making the death sound was already destroyed when the rpc reached the others

[kindred widget]

Typically best to do a lot of stuff like that from already replicated state. On server, set health. Let it replicate. On all machines, when health is changed, set lifetime to 1-3 seconds, play death effects, disable pawn, let it get destroyed everywhere after the lifetime expire.

If health <=0 of course.

[twin juniper]

How much money does it take support dedicated servers for an MMO

[scarlet cypress]

As far as i know it's pretty cheap (unless your game goes viral, but then you'd have the money anyway)

[twin juniper]

It would have to host maybe 200-250 people per server

[scarlet cypress]

Per server? Do you want to make a battle royale with 200 people?

Or what do you mean?

[errant vapor]

whats the simplest way of finding out why an Unreliable Client RPC is not being sent? is there a log or something for when theyre dropped?

[scarlet cypress]

Enable Network Emulation helped me and maybe the Network Profiler can help you.. (if you don't already know that)

[errant vapor]

thanks, ill give it a try

[dark edge]

@twin juniper if you have to ask, do NOT try to make an MMO lol

[empty bluff]

@meager spade in case you're wondering, i found a solution to my door open issue (when running in and out of relevancy). 1st of all i gave up on trying to get it to work with a multicast. I reverted back to replicate movement for the door-actor and setting the component replicate = true flag for the door staticmeshcomponent

[bitter oriole]

Likely not possible with UE4, though

And also no indie game has 200 players online at all times

[empty bluff]

the above example, i can't get to work consistently with a multicast + repnotify in the scenario when relevancy changes. If someone can explain to me how that should be set up, i'd be happy. (edit) i can get it to work if i issue this command: net.AllowReliableMulticastToNonRelevantChannels 0, but not sure this has some other undesired sideeffects?

[left heath]

Hey Iv'e been trouble shooting how to implement Multiplayer to my projects but have no idea where to start, does anyone know of any good sources to research and understanding this topic?

[stark flax]

I don't fully understand the online subsystem, I'm going to be connecting via IP address, do I need to use the online subsystem for that? I thought if I have the host open the level with the listen option I should be able to have clients join by doing "Open IP" on the clients connecting.

[dark edge]

Yes, you want something like that to be state driven. Either by replicated movement or some other property.

[twin juniper]

I think it is not possible for 200 players in ue4 but i think we have around 80 players at a time like fortnite does in ue4

[dark edge]

I mean it depends on what they're doing. 200 person chess, easy. 200 person physics driven RTS, hard

[empty bluff]

@dark edge Thx for the confirmation, and great to hear you mention state driven. I wasn't sure if that applied here. Guess that's why my other setup that worked was based on 3 bools: IsOpen (with reponotify), DesiredOpenState (with reponotify), IsSwitchingOpenState. It's somewhat complex. Would you mind looking over it and see if i do something wrong/unnecessary

and sry for the crammed BP graph, i tried to fit it all into one picture

so my idea with that initial setup was to use the OnRep_DesiredOpenState as a way to start the door animation instead of using a multicast (because at that time i didn't know about the net.setting i mentioned above)

i added the bottom (false) execution because in certain circumstances when passing in and out of relevancy while state was switched on another client, the door was animated to open while the real state was actually closed, or vise versa. Feels like a hack, but worked.

[void nest]

I have a question regarding controllers. Imagine an RPC call to a serverside controller. Now Imagine that there are two controllers. Both controllers receive a call from their clients (run on server) at exactly the same time. Do both RPC's run simultaneously or does the engine process one RPC at a time? 🤔

Now I know in regular actors which receive multiple RPC's from clients they will not run simultaneously as the single actor can only process one call at a time. But in the case of two separate controllers I'm not sure.

[empty axle]

Still one at a time.

[void nest]

Hmmm. We have a very strange issue with our game where players can overflow teams (surpass the max member limit). In order to join a team they have to press a button which then sends a request to the server version of the player's controller to try and join said team. First the controller checks if there is room, if yes the player is able to join. The issue we are experiencing is that if two players try to join a team at the same time they manage to bypass the room check and are thus able to overflow a team (5/4).

We've checked absolutely everything and the only thing that seems like a logical cause is that both controllers run the code at the same time. Because if they weren't the second controller could never get a true from the room check.

[dull flare]

Hi, I am struggling with implementing a FreeLook camera (meaning : camera rotates with player when right click pressed, else camera rotation is free and player keeps its direction). I managed to make it work locally by toggling CharacterMovement->DesiredRotation but since it's done from input events servers always thinks I'm rotating the player. Any idea / link / advice ? I've spent too much time on this.
I could use an RPC to trigger DesiredRotation but I don't think it would be clean way to go

[empty axle]

@void nest the RPCs can't run parallel. If that was true then basically your whole gamecode would have to be threadsafe

[void nest]

Yeah that's the thing, our logic also tells us this can't be possible. But the problem is everything points at it. It's a real mind breaker this one.

[winged badger]

@void nest have the room player count adjusted from APlayerController::Login and checked in PreLogin

and just send a message "Sorry sucker"

they will still be able to attempt to join at the same time

but the 2nd one will fail

[void nest]

The way the team system works is the playerstates and controllers have a teamID int variable which is set right after a member is able to join a crew (after the room check). The room check itself runs through all of the playerstates to count the players within the team that is requested to be joined.

[winged badger]

ugh

no

for PlayerState to register it needs to call BeginPlay

that is usually too slow

[void nest]

Well, the thing is we also tried replacing the playerstates with controllers in the room check function.

Still the same issue

[winged badger]

yes, because you have to *instantiate the controller to do that

PreLogin is only place where you can reject connection

[void nest]

No no, it's not really a system that requires any connecting. All players are already connected. It's an in-game team joining system.

[winged badger]

ah

ok

[void nest]

All players are already connected to the server. And from there each player can join a team using a button and a teamlist.

[winged badger]

what manages the teams?

[void nest]

A struct array in the gamemode

Which contains all of the teams

[winged badger]

full object would probably be better - 1 per team

[void nest]

Each team is identified by a TeamID integer

[winged badger]

and i'd go with Actor

use it to replicate Team Specific information as well

[void nest]

The playerstate also has a copy of the team struct array for replication reasons (so the clients can retrieve them as well)

[winged badger]

i would instantiate one Actor per team, make it relevant only to its team

and have it be able to refuse players joining it

[void nest]

The problem is the team system is already very much built in and pretty complex. It's not a new project, but one we've been working on for years. The team system also works as intended except for this one issue.

So it's not really an option to completely remake the team system, it's already deeply intertwined into the game as well. So yeah 😛

[winged badger]

do you have a way to refuse player joining the taem?

not attempting to join a team, but actually joining?

[void nest]

Currently that's the job of the room check function, that one should deny a player to join if the team is full.

But that's where the issue happens.

[winged badger]

that does need to run on server, and send a RPC informing the player spot was taken if it fails

[void nest]

Yeah it runs on the server already

There is a pre-check on the clients to see if there is room. But the actual joining happens on the server where another check happens.

[winged badger]

sounds like you have a bit of client auth, so latency can fuck it up

server check obviously doesn't work

[void nest]

Yeah, as far as we know both clients request to join, there is some latency, server receives both requests. Both requests arrive in two different controllers though. So each controller processes the request by checking if there is room, if yes player can join and thus his TeamID is set to the team's ID.

[winged badger]

how do they check?

[void nest]

The way the room check works is so: https://gyazo.com/d90dddfa44b5f5699ee106b6769eba69

So it loops though all the playerstates to count the teamID's to see how many players are part of the Team.

[winged badger]

and the joining part?

[void nest]

https://gyazo.com/2e6c03706439c066750b0bdc7fe44802

wait lemme try and get a higher resolution of that

https://gyazo.com/6754d206c4819104f6d7650c1287faa3

This is server code in the player's controller

Thing is that in order for the players to actually join a team the check if crew has room function needs to return TRUE. If it doesn't there is no way whatsoever a player can join a team. So we know for a fact that the check if crew has room function returns TRUE.

[unborn sierra]

Hi All!

I'm new into UE4 and I have to work on networking (C++ project). I've done net programming in the past, but not in UE4 (and not in C++).
So, my flow works that:

1. I have specific subclass of ACharacter (I'm basing on First Person Template)
2. When I want interact with some actor (i.e. press E to collect item) I just execute Server RPC to interact on server, from my custom ACharacter class
3. Server do game logic, and replicates variable related to that logic
4. Client get above variables and perform changes based on changed state

Am I correct? I know that Epic suggests to mostly work on replicated variables instead of RPC, but I don't see other way to do it. I'm just asking, because more and more methods are becoming servers RPCs (i.e. use item, throw out item, add item to inventory...), which could impact on latency later in development.

What is a good approach to handle this? I am working on rather coop, but I don't want to give much opportunity to cheaters.

[winged badger]

can't read that @void nest too low res

[void nest]

and the second one?

this better?

[winged badger]

why do you branch the logic based on who asked?

the answer is the same

[void nest]

What do you mean by that?

[winged badger]

only client information might be out of date, but nothing you can do about that

CheckIfCrewHasRoom

[void nest]

Yeah but this all runs on the server version of a player's controller which should always have the correct information right away, no?

[winged badger]

so why do you have bFromClient bool?

[void nest]

the from client bool is for the client UI so it can pre-check if a crew has room. This may result in outdated info, yes, but that's why the server ultimately also checks before actually allowing a player into a team.

[winged badger]

if you're using PlayerStates to do that

[void nest]

It's used to grey out the join button if the team is full

[winged badger]

same logic works for clients and server

[void nest]

Ah yes, that's correct. The from client bool was something we used to either use controller or playerstates. Controllers on the server, playerstates on the client.

But we then changed it to always use playerstates.

But the problem existed in either cases.

[winged badger]

first step in debugging a system

chop off the bits that don't belong

[void nest]

Yeah, we're doing that now actually, but the problem still persists.

[winged badger]

i don't see the return logic from the CheckIfCrewHasRoom there either

as its hardcoded to false

[void nest]

https://gyazo.com/4f7b042b992fdb14478fd55aaa26bfe6

this is the chopped down code

which doesn't care about client or server and only uses player states which work on both although delayed on clients but that's fine for what it's used.

[winged badger]

you have a mess of checks

force, bypassing for party

make an Actor per crew to manage it, relevant only to that crew

you can also debug it in PIE

just write a tiny little script that will run on server, and send a client RPC to 2 clients to join a crew that has only one spot left

add some lag

and it should be breakpointable

[unborn sierra]

I'm pointing up my question 😄

[winged badger]

i would put the interact in the PC

the RPC

other then that, its fine

server can validate, do some quick sanity checks

your client can send a message that hes picking up an ammo clip off the ground from 2km away

but server can check if the interaction is possible instead of just blindly accepting that it should put it in players inventory

[unborn sierra]

@winged badger right, in my project when client wants to interact it calls server RPC. And of course, I'll put some checks :D.
Thank you, it's sometimes hard on the beginning to get head over it.

[winged badger]

you're on a good track

[unborn sierra]

Another question:
I want to prevent clients from executing some code like using items without calling to server (i.e. developer could use wrong function).
Just checking HasAuthority would work?

[empty axle]

Should work. You can also add BlueprintAuthorityOnly macro if those are UFUNCTIONs

[unborn sierra]

@empty axle thx!

[violet sentinel]

Hi. If i have a weapon platform with several weapons attached to specific socket positions. But on clients they are never in correct locations

APlatformWeapon : AActor {  }
AGunPlatform : APawn { ... }
FWeaponConfig { WeaponClass, WeaponAttachPoint }   
AGunPlatform::PostInitComponents calls SpawnWeaponry on Authority only

void AGunPlatform::SpawnWeaponry() { 
   for(auto& Config : Configs) {
       // Question 1: do I need to get initial transform if I will attach it later? 
       FTransform SocketTransform = GetSkeletalMesh()->GetSocketTransform(Config.WeaponAttachPoint); 
       if (auto NewWeapon = World->SpawnActorDeferred(Config.WeaponClass, SocketTransform, this, this, ESpawnActorCollisionHandlingMethod::AlwaysSpawn))
       {
             // set some properties of weapon
             // call finish
             NewWeapon->FinishSpawning(SocketTransform);
             // next here I attach the newly created weapon to where it should be
             NewWeapon->AttachToActor(this, FAttachmentTransformRules::SnapToTargetIncludingScale, Config.WeaponAttachPoint);
             // add weapon to my replicated TArray<Weapons>
             Weapons.Add(NewWeapon);
       }
   }
}
void AGunPlatform::OnRep_Weapons() {
   for(auto& Weapon : Weapons) { 
      // Question 2: I have to call attach again on clients as their positions were incorrect is there any better way of doing it?
      NewWeapon->AttachToActor(this, FAttachmentTransformRules::SnapToTargetIncludingScale, Weapon->WeaponAttachPoint);

   }
}

[void nest]

@winged badger We found the cause of the issue and you're not going to believe how rediculous it was.
https://gyazo.com/0b38719b8ee58698adce316ee80dfafd

I kid you not

The damn thing wasn't connected

We actually found it because you gave the hint of trying to test it with breakpoints in the editor. And so we did. 😛

[winged badger]

we run all logic that can go to shit in a packaged version in c++

[void nest]

First we debugged the function and found that the value was 1 (teamID) before going into the function, but once we entered the function the value was suddenly 0. So at first we were like what the actual f is going on here. Then going back we saw the small dot had a value of zero, so yeah after that it became pretty obvious.

[winged badger]

can't debug blueprints then

[void nest]

I guess this is a downside of blueprint visual scripting 😏

[winged badger]

that, and specifically for networking, you only have about 10% functionality exposed

[distant wave]

check this out: https://forums.unrealengine.com/t/getlifetimereplicatedprops-error-c2509-getlifetimereplicatedprops-member-function-not-declared-in/222461

I am in the same exact situation, I mean I ended up declaring it in the header but I have another project in the same version of unreal and it compiles just fine there (without declaring it in the header).

it isn't an issue but I was just curious

I am...** FAT AND CURIOUS**

[regal storm]

Ahoy folks! 😄

Looking into replicating ship movement. I've simplified it down to a single force applied for now, but basically I'm applying the force on the server, and then sending the world transform of the actor to the clients. Is that a decent method? Only, I notice that the clients first start out really jittery when walking on top of this actor, and then after that subsides and the client's own movement is fine, the other client pawns vanish (assuming fall into the sea).

Any thoughts on what might cause that? Is it the method I'm using to send world tranform information of the vessel to the clients, or is it the client pawns freaking out from the floor beneath them changing so often?

And the apply forces function:

(moved this here from #blueprint)

[meager spade]

why is your begin play setting a timer on server that is calling an RPC?

then your teleporting the ship on the simulated proxies

so poor clients will see a bunch of jitter

this is not the best way to move something

you need to smoothly move it on the client based on a the force applied, and its new location, via some interpolation

[regal storm]

Hmm, perhaps a limit in my knowledge, my understanding is that for all clients to see the same movement, the server needs to handle movement and then update the clients? What would be a better way of doing this?

[meager spade]

server should do the move, correct, but you cant just teleport it on the client

you have to interpolate based on previous and new position to make it move smoothly

what happens when a client has 70 ping?

he would see it just teleport places

and why is this not done on tick

or via some input?

[regal storm]

Input is provided by players to influence the direction/amount of force applied, but the force is always applied regardless of input. I've always just avoided tick out of principle, so perhaps my non-replicated best practices of not using tick for everything is clashing with what's best for networking. I can certainly use tick here.

As for the interpolating, that's a fair point. Could I not just get current and previous world transforms and vlerp between them?

[rose egret]

is PC->PlayerCameraManager local player only ?

I need it on server

🤔

[thin stratus]

It should be iirc

Gets spawned from pc

[rose egret]

so how do I get current view target in dedicated server ?
because

AActor* APlayerController::GetViewTarget() const
{
    return PlayerCameraManager ? PlayerCameraManager->GetViewTarget() : NULL;
}

oh found it. its available in server and owning client since SpawnPlayerCameraManager(); is called in PostInitializeComponents()

[glossy veldt]

Hey guys, i have the following problem:

In my PlayerState i have the following function:

void ASPPlayerState::HealthChanged(const FOnAttributeChangeData& Data)
{
    // Check for and handle knockdown and death
    ASPHeroCharacter* Hero = Cast<ASPHeroCharacter>(GetPawn());

    if (IsValid(Hero) && !IsAlive() && !AbilitySystemComponent->HasMatchingGameplayTag(DeadTag))
    {
        //ASPPlayerController* PC = Cast<ASPPlayerController>(GetOwner());
        ASPPlayerController* PC = Cast<ASPPlayerController>(Hero->GetController());
        if (PC && PC->IsLocalPlayerController())
        {
            PC->HideHUD();
        }

        Hero->FinishDying();
    }
}

I want to hide the HUD of the Local PlayerController but PC->IsLocalPlayerController returns false.
Any Idea why?

[potent cradle]

You're totally sure the code is being executed locally and not on the server?

[dark edge]

@empty bluff Why not just 1 state, bIsOpen?

Or if the door can be partially open, float OpenAlpha

[glossy veldt]

I am not no. Would i then need a seperate function that gets called on the Client?

The code is from GASShooter and i modified it for my project

Not 100% Sure where HealthChanged gets called

[potent cradle]

You could do a log so you can verify if it's being executed on server or client. If it's running on the server, you don't need to hide the HUD anyway, so could be fine.

But I can't tell from the code if it's running client-side at all

(Does FOnAttributeChangeData constitute a repnotify change or something like that? I haven't done C++ networking yet)

[glossy veldt]

So it gets "called" here:

void ASPPlayerState::BeginPlay()
{
    Super::BeginPlay();

    if (AbilitySystemComponent)
    {
        // Attribute change callbacks
        HealthChangedDelegateHandle = AbilitySystemComponent->GetGameplayAttributeValueChangeDelegate(CharacterAttributeSet->GetHealthAttribute()).AddUObject(this, &ASPPlayerState::HealthChanged);


    }
}

The Project is using the GameplayAbilitySystem btw.

[potent cradle]

Someone more familiar with GAS will probably know off the top of their heads where this'll run. But if you've copied it from GASShooter, and that includes the HUD hiding call, then I imagine it runs both on server and client (using the if LocalPlayerController check to separate them).

Is the behaviour you're seeing good? Does it hide anything? Even if it's false once, which could be the server being filtered out.

[glossy veldt]

In GASShooter the HUD was not Hidden when the Player died. I added it myself.
The hiding works for the ListenServer but not for Clients

[potent cradle]

That sounds like it's running on the server then

Maybe make IsAlive a repnotify and hide the hud when the value changes?

[glossy veldt]

What do you mean by that?

[potent cradle]

If you set IsAlive to be a repnotify value, the client will be informed with a function call whenever it's switched to false. At which point you can turn off your hud

Random tutorial: https://www.programmersought.com/article/80143959856/

[glossy veldt]

Alright will try that. Thank you for your help!

[glossy veldt]

I fixed it by making it a Client RPC

Should have thought of that earlier...
But now it works for listen server and client.

[scarlet cypress]

I just finished my first multiplayer project, would be cool if you guys could get me some feedback!

I posted it in #released it took me 10 days to make

Is that a good result?

[potent cradle]

Noticed something weird:
I have a flow on the server in which I instigate swapping an HISM instance with an actor. The spawned actor replicates to the client and also spawns there, but there is seemingly a slight delay between hiding the HISM and the actor being spawned, causing the process to flicker:

1. HISM instance disappears
2. [ Nothing visible for a brief moment ]
3. Split second later, spawned actor arrives.

Now the weird part: if I ApplyPointDamage to the spawned actor at the moment I spawn it, the issue is gone.
Does applying damage perhaps increase spawn replication priority or some sort of related magic?

[marsh ember]

When i export my Game and click host i loads the Game Level but switches instantly back to the Main Menu. If i turn off the Steam subsytem it works fine. Can somebody help me?

[steep sail]

@marsh ember Hey, I can't help with your problem. But I'm having a hard time getting the steam sub system working at all. Did you use a guide to get it working?

[marsh ember]

i used this tutorial https://www.youtube.com/watch?v=EDNF2DNLhPc&t=1337s

[steep sail]

Thanks, I've used that one too I wonder why mine wont connect 😦

[marsh ember]

I'm not even there yet

[steep sail]

I mean my gives an error saying it can't start the steam sub system, in the log.

[marsh ember]

Do you have steam open in Background?

[steep sail]

Ya

[marsh ember]

Sorry than i cant help you too

[silent valley]

There are many edge cases to this approach. I ended up using the Actor BeginPlay to hide the instance and EndPlay to reveal it again.

[potent cradle]

Yeah, that feels like the cleanest option tbh

The hack works for the moment, but I'll probably end up implementing something like that.

I wonder what causes it though 🤔

I can understand the mismatch between when spawning is done and the foliage is hidden, but I wonder why applying damage "fixes" it

[silent valley]

Good luck. I'm on my 4th version of harvesting foliage now 😂

[potent cradle]

Plugins or homebrew?

What kinds of issues did you run into?

Be nice to learn from the pitfalls you encountered 😄

[silent valley]

I rolled my own. Issues with relevancy, wanting to have lights/animations etc on instances, supporting 10s of 1000s of instances, etc.

World Composition problems

So many 😂

[potent cradle]

#pain 😄

[silent valley]

Current system uses the hism just for transforms. I copy them into a replicated class which handles replication of visible/damage state/etc.
Each client has a collider which detects instances on screen and spawns local actors for each instance. This works for us because we're top down.

[empty bluff]

Well hard to explain other than i had some edgecases where moving in and out of relevancy caused them to become out of sync.. i’ll see if i can post a video some time soon to show the scenario

[waxen socket]

Hello, I have a question about pausing.

Is pausing in UE4 during networked, peer-to-peer play generally well-supported? Will it be as simple as calling SetGamePaused on each client and then the server or will there be sync issues galore especially after unpausing?

Any advice from those who know would be appreciated.

Cheers.

[meager spade]

UE4 does not have p2p by default

UE4 is server-client

[narrow prairie]

For some reason my steam doesnt work when i package my project. it does however work when i right click my project file and launch. also standalone isnt working anymore 😛 did anyone came across this situation?

[meager spade]

our steam works fine in packaged

i would verify your app ids, and when you launch the packaged game a steam_appid.txt file should appear in the Binaries/Win64 folder

and steam overlay pops up, if it doesn't then your steam setup is wrong

[narrow prairie]

it only pops up when i right click my project file and launch it from there

:S

[oak jewel]

hey guys having an issue where the reload animation is playing on server when a client reloads. appreciate any help 🙂
https://cdn.discordapp.com/attachments/585821731869032448/839963222299901972/unknown.png

[foggy idol]

is string better for RPC's compared to text ?

[eternal canyon]

Dont send eitehr

[lament sinew]

You can have rpc's with an FString like this, but i've never seen FText as param

UFUNCTION(Server, reliable)
void Server_SetName(const FString& NewPlayerName)

which is how you would set a player name on the player state from client side

[foggy idol]

Nani?

[foggy idol]

thanks

[warped berry]

Hello everyone, I'm trying to learn about the online subsystem interfaces, specially steam and I've checked the ShooterGame code but I cant get the reason why there are repeated functions in the GameInstance class and the GameSession class,, I tried to trace back the calls but at some point they use events and broadcast it and don't know where they are registered?
Can someone help me get it or provide any recent material to learn from because all that I've found are outdated and really old tutorials

[lost inlet]

do you have a more specific example?

[warped berry]

yes for example, the JoinSession function is implemented twice in GameInstance and GameSession, in the GameInstance version they get a ref to a GameSession class and then bind a delegate to it then call JoinSession on GameSession

[lost inlet]

use single backticks

and I don't have shootergame in front of me

[warped berry]

sorry edited

[lost inlet]

well that isn't OSS code, the game session is an actor that does manage the platform session in a way

[warped berry]

so it doesn't have to do with the fact that GameSession exists only on server?

[lost inlet]

well on the menu you have a game mode and game session

you don't have to implement the way shootergame does

[warped berry]

you mean that GameSession can exist on clients as well?

[vivid prawn]

When you AttachActorToComponent on the server, does it replicates on client as well?

I tried using p.NetShowCorrections and there is correction from server to client, does it means AttachActorToComponent is not replicated?

[grim yoke]

Anyone know why when clients connect to a listen server the listen server player can not move? You can control the server player for about a half a second before it loses it's player controller or something. Edit: I fixed it. I needed to turn off Auto-Posses on the Character Blueprint.

[steady musk]

Guys, any chance of Load Level Instance level to be replicated?

Already broke my brain trying to replicate it

[vivid prawn]

Level Instance?

you mean GameInstance?

[steady musk]

No, I mean Level Instance 😄

[regal storm]

Difficult to know if this is replication, physics or something else, but anyone know how I might solve this issue? Jumping from a moving platform (simulated physics object), seems to cause a snap forward (into the movement vector of the boat) and then snap back on landing to the original jump off location.

This doesn't happen offline, it's only a multiplayer issue.

I'm using the smoothsync plugin to replicate the physics movement of the boat, using almost default settings:

[chrome bay]

FText should never be sent via RPC even though it's supported, just use FString

[steady musk]

Guys, I want to load some level ONLY on server (not on any of clients). How can I do it? Already tried this setting but seems like its only for volumes

Loading level with

[regal storm]

Why would you need to load a level if no players are in it?

[steady musk]

To prepare it and then move some players into (not all of them)

But if server loads a map then EVERY player loads it too for some reason

[regal storm]

Prepare it when the first player enters?

[steady musk]

Mate, thats not about "is there a player or not"

Its about loading level using Blueprint only for certain players

[regal storm]

I'm not sure about that, but I guess my point was, you don't need to load it only on the server, just for the specific players. I'm not sure how that is done, but yeah there isn't any benefit to loading it only for the server first

[thin stratus]

Iirc there is another setting that stops the loading to happen automatically. Not sure about the replicated actors in it though

[lament sinew]

is there a way arround calling rpc on an actor that is loaded from a package and unowned or not owned by rpc invoker?

[surreal plaza]

For actors that spawn additional sub actors on creation, how should I think about the authoritive safety of that? If the server spawns the primary actor, I am assuming that sub actors would be spawned on the local machine. Do I just do an auth check on the server while creating the subactors and it all works out?

[winged badger]

if the server spawns it, yes

if a client spawns it, it will then pass the authority check (it has auth over locally spawned actors) and spawn subactors

[surreal plaza]

Is it bad in the second case? If a client passes the authority check then my server wouldn't have created it. These would be game logic critical actors.

[surreal plaza]

Is that clear? I am assuming all logic critical actors are only ever spawned on the server.

[winged badger]

thats your responsibility

[surreal plaza]

But that assumption is correct, right?

[bitter oriole]

It's up to you

[eternal briar]

I have a very simple question, I have an actor which replicates, the root component is a scene component and I have a static mesh component connected to it. I want the relative transform of that mesh to replicate over the network, what would be the best way to do that?

[surreal plaza]

I think I phrasing that wrong I belive. I am saying that both the primary and child actors are in fact gameplay critical. There is no question about that. Therefore, yes, they would have to be spawned only on the server.

[waxen socket]

So the static mesh component is moving independently of its parent?

[eternal briar]

Yes

[waxen socket]

Have you set bReplicateMovement to True?

[eternal briar]

I have set that true in the parent actor

But it did not work

[waxen socket]

You may need to set the component itself to replicate. Are you using C++?

[lament sinew]

bReplicateMovement is for the whole actor movement i guess ?

[waxen socket]

Yeah, it is.

[eternal briar]

I did set the component to replicate, I am using BPs

[waxen socket]

And keep in mind that only the root component will sweep for collisions.

You've set this to True? Specifically on the static mesh compoenent?

[eternal briar]

Yes

[waxen socket]

According to this answer here, what you're trying to do may not be possible. https://answers.unrealengine.com/questions/997415/what-does-replicate-movement-is-supposed-to-do.html

[eternal briar]

Ah okay damn

I guess I will have to use RPCs

[waxen socket]

If you really need the component to move but want the parent to remain still, maybe try making an actor with your static mesh as the root, and then attach it at runtime to another actor.

But you'd have to research attachment replication.

[eternal briar]

Okay understood, thank you for helping!

[waxen socket]

Good luck!

[eternal briar]

Thank you

[waxen socket]

Now I have a question about pausing and replication. I'm not entirely attached to allowing pausing in my game so I'm just looking for advice or warnings on how hard this might be to implement.

Is pausing in UE4 during networked, listen-server play generally well-supported? Will it be as simple as calling SetGamePaused on each client and then the server or will there be sync issues galore especially after unpausing?

Any advice from those who know would be appreciated.

Cheers.

[surreal plaza]

What type of game is it?

[waxen socket]

It's a space shooter.

[eternal canyon]

Look at the Network Prediction Plugin allows you to easily make Server Authoritative preidcted movement/Abilities

[waxen socket]

Thanks, but do you think I need that just to implement pausing?

[eternal canyon]

oh lol I thot u were talking bout movement in genral\

like a flying movement

[lament sinew]

I don't think it's a good idea to be able to pause a multiplayer game
if you talking about something like in riot games where the game is paused/resumed (league of legends)
i think in the background its actually still receiving data from server but not allowing any client to perform any actions where they display a gray screen with a throbber
and its paused for 30mins only..

@waxen socket

[waxen socket]

You just think it's bad because it's uncommon, or because it causes sync issues?

[lament sinew]

Yeah sync issues specially if pausing the game for a single client

[waxen socket]

It would seem from initial tests that time dilation at least replicates automatically... Hm...

[scarlet cypress]

Is this the correct & clean way to set up sprinting? (I do not care about safety)

[vivid seal]

If I send a reliable RPC from a component, then I change some movement variables (which will be sent by the CMC unreliably at a later time), there’s no guarantee which will arrive at the server first right?

[scenic turtle]

Hi all, I am looking for some tutorials in starting developing multiplayer with the Oculus Quest 2. I am relatively new to Unreal and I am looking for blueprint based explanations. Thanks a lot.

I did found VR tutorials, but I am looking for something which is multiplayer focused, explaining replication, client & server connection in a blueprints environment.

Right, cheers. 👍

[foggy idol]

Thanks

[acoustic jewel]

I have a question guys. I have a game with a server map setup. I tried to quit to menu using OpenLevel -> MenuMap but it throws me in the MenuMap for a fraction of a second and then loads the ServerMap, I assume that as I am the only player once I quit it thinks that I am a server and loads the ServerMap. How to bypass that?

[glad minnow]

Hey there, has anyone been able to or know how to make the time attack racer tutorial (https://www.youtube.com/watch?v=VJj6rQpktyI&list=PLZlv_N0_O1gYdhCvvMKGpCF6LCgBz9XeS) multiplayer (not local, 2 different pc)? I have multiplayer set up, but the checkpoints don't seem to be showing when there is more than one player. I feel like it should be really easy, but I don't know what I am missing. Thanks in advanced.

[terse pine]

hello can anyone help me
currently ripping my hair off trying to learn how to make multiplayer work
and i have an issue with my game that i didnt have before
basically the second character in the level cant move and doesnt recieve any updates from the server (i think thats whats happening atleast)
the server character works perfectly as it should, it can move shoot and see enemies move and stuff
but the second one can only rotate the camera (top down game)
its almost like the game is froze for the second character

[dark edge]

Are the characters already placed on the map or are you spawning them with the game mode?

[sullen kernel]

To make a multiplayer day/night cycle that is consistent with clients, would a good solution be to manually replicate the rotation of the directional light? Where would be a good place to put these code/variables?

[eternal canyon]

replicate the time

and the client does it itelf tahts what I would do

as its not essential to gameplay

the actual visual\

[sullen kernel]

What time is that? Create my own time variable?

[eternal canyon]

yes

I would put that in the GameState

[sullen kernel]

ah ok. i was only thinking of replicating the directional light rotation, because the skybox already has a function UpdateSunDirection that updates the sun height and light direction based on that roation (so it changes the sky image to night/day time based on the rotation). i was thinking clients could call UpdateSunDirection in their OnRep functions whenever the rotation changes.

[twin juniper]

I'm setting EMovementMode::None to stop the player from moving, but also I need to apply a root motion force to that character with that movement mode. Basically I want to disable movement input for a few seconds and apply a root motion force while that is happening

[eternal canyon]

I would just do it on the client as trying to replicate all that when u can just do on client as its not essential or int is a lot of data to send over for something that doesnt need to be replicated

by just having one replicated variable for time

[sullen kernel]

ok thanks. a float variable that I can set with GetCurrentTime() maybe

[oak jewel]

when the client reloads the animation is played on server and is looping. been stuck on this 2 weeks 😦

[terse pine]

they are already placed

sry for long wait for reply i went to get some food :p

oh wait

no

its not already spawned into the world

[dark edge]

@terse pine how does your setup differ from the 3rd person template?

[lament sinew]

if I have an Actor in the game world and 2 Pawns,
if a Pawn wants to call an RPC defined within that actor,
to do something in the actor itself which is replicated ...

I know it's not allowed in unreal, and the RPC will be dropped.
But is there any other way to achieve this?

[round star]

Does anyone know where I can go looking for dedicated servers and hiring a team to help network my game..I need quotes from somewhere but I can't find anything for this.

[rapid bronze]

I guess #hire-a-freelancer #hire-a-studio #salary-jobs #freelance-jobs

[dull lance]

wdym it's not allowed?

[vivid seal]

what's the standard way to make the client constantly move (basically just set them to always have movement input for a duration) in an authoritative way? I figure you could set it on the client to just add movement input on every tick, but since its client predicted, that's not really authoritative

[lament sinew]

according to the second table here: https://docs.unrealengine.com/en-US/InteractiveExperiences/Networking/Actors/RPCs/index.html (RPC invoked from a client)
you can't invoke an rpc on an actor that is not owned by invoking client
it will get dropped and you get this warning
No owning connection for actor MyActor_C_0. Function ServerUpdateValue will not be processed.

[eternal canyon]

Well if its a Server RPC thats not true

[dull lance]

Owning client -> Server -> Actor in question->RunFunctionThatYouWanttoRun() -> RPC

[lament sinew]

yeah but the invoking client doesn't own the actor therefore there's no connection

am i right?

[dull lance]

No no

you RPC from your Pawn

which you own

you send an RPC to the server saying that you wanna do smth with "X" Actor, and the server does what you want from there.

[eternal canyon]

no

if the call to the other actor is within a Server RPC called on the one that is owned then it will be processed

[lament sinew]

that's what I thought but it keeps showing that warning above

[dull lance]

also @lament sinew as a recommendation, unless you absolutely know Why you're doing it, replicated actors should only be spawned by the server

[lament sinew]

i tried spawning from server it doesn't change anything in this case i guess

[dull lance]

how are you trying to send RPCs to server from your owning pawn?

[lament sinew]

let me explain it what im trying to do exactly

[dull lance]

usually it goes along the lines of this```cpp

void AMyActor::LocalRequest_Action1()
{
if (HasAuthority())
{
//if spawned from server, we're server. Run the function with the functionality
Action1_Impl();
}
else if (GetLocalRole() == ROLE_AutonomousProxy)
{
//we're owning client. Send RPC to server
Action1_Server();
}
}```

And this is for whenever you need to be on server to run smth

[meager spade]

Server RPC needs to be run on a an actor with an owning connection, by default this will be PlayerController. PlayerState and a Possessed Pawn can also call RPC's cause there owner will be the player controller. If you have a RPC function in an actor not owned by an owning connection (owned by the connection trying to RPC) it will be dropped.

Actor->SetOwner(MyPlayerController) then you can RPC on that actor (has to be called on server)

[dull lance]

wouldn't this be -under regular means- specified at the GetWorld()->SpawnActor() //SpawnActorFromClass for bps) level for the Owner Variable?

[meager spade]

yes

normally when interacting with actors that belong in the world, you do it via the player controller if they are not owned by that connection

but say you have a gun, which is an actor spawned on the server, its owner is set to the player who picked up the gun. This gun can now send server and recieve client rpc's.

Multicast is different and only requires the actor to be replicated. The multicast HAS to be called by the server tho.

[lament sinew]

In case if you want players to be able to interact with that actor simultaneously
say that you have a treasure_chest_actor (with items inside) and i have 2 player pawns interacting with it at the same time
you don't see replication changes from both sides ( client1 and client2 when something changes ) only the owner

[meager spade]

the rpc needs to come from the player controller

the owner should be the server.

(no owner)

treasure chest should be spawned and replicated. player 1 and player 2 calls into there controller to start interaction with the treasure chest

maybe via some interaction interface so you don't hard code interaction to a single item or require multiple different rpc's.

[clear salmon]

will APlayerController::Client Travel only Let clients travel to a UE4 Dedicated Server

or can i set up some Custom Server not based on UE4

[covert saffron]

yo, I want to make a battle royal fps, what's a good video I could watch that explains the standard/best way to handle multiplayer with the engine?
I'm afraid of building gameplay systems just to find out that it's not very compatible with how multiplayer should be handled

like, idk what things are a no-go for networked stuff

like using event tick or timelines or something

[terse pine]

id like to say its the same

since i used some third person assets in my project

but i think it might have something to do with gamemodes and stuff

[hollow halo]

hey guys I'm new to multiplayer so any tips are welcome. Here's the problem I'm facing: I can't click the buttons on my UI. When I play on standalone I can click the buttons completely fine, but when I'm playing on listen server/client the buttons don't work. They do enable, which I can tell based on their color but I can not click or hoover on them to get a response. This is what I checked: zOrder of the button and their parents (button inside horizontal box inside scroll box) are high, Input mode is set to game and ui (also tried with ui only), checked if the buttons locations were somehow offset and the buttons and their parents are enabled. This is how I enable the ui:
https://prnt.sc/12ne2bl
I've tried a few different approaches but it would either open the ui on the server's client, all clients but not the server or none at all. In all cases however it was still impossible for me to get a response when hoovering/clicking the buttons.

[north heath]

I am having some trouble replicating the mouse and gamepad input axis values

If I create a similar variable from the get base aim rotation it works fine.

now if I set a variable on the server from the camera variable it works fine, but if I use the camera XY variable based on the input axis it only works on the server.

The reason I dont just use the second option is because I have a autoaim like function that moves the camera, causing that variable to change regardless of mouse or gamepad input.

[spice gorge]

I have a clickable button on the UI that spawns a weapon blueprint. The weapon blueprint is set to replicates . The above code only works for the Listener Server. If one of the connected clients clicks on their UI, the weapon spawns only locally to them.
I would have thought sending the event to the server to execute would have ensured that it worked on any client, but this isn't the case.
Am I missing a step?

[dark edge]

Widgets don't replicate

Do the RPC in something that does.

[spice gorge]

Ah. I hoped that sending the event to the server would resolve that.

[dark edge]

Probably PlayerController unless this is a very character specific action

[spice gorge]

PlayerController sounds like a possibility. It's a base action all players can do

[dark edge]

There's no server-side version of that widget. Widgets should be pretty dumb and not directly be spawning things

Like you don't want the menu to spawn the item, you want the menu to tell the controller that it desires to spawn the item or whatever

[spice gorge]

Yeah makes sense. I actually had it setup on the character before, but in my task of trying to resolve why it wasn't working I pulled the spawn back until I reached the widget. I guess I need to reroute back out now.

[warped berry]

the link for "Multiplayer Network Compendium" in pinned messages is broken, is there any alternative ?

or any materials with examples to learn about the Online Subsystems?

[spice gorge]

https://mega.nz/file/GtIXGYwT#mvd0dyuO_abl2nOJj6y-FcUTsHwLCNknHVw7tf44QL8
I just uploaded the pdf of it as I have it on my local drive.

[warped berry]

Thank you xd

[spice gorge]

It worked, thanks for the tip!
I setup a server event on the PlayerController, with an input for which character to spawn an item on, and call the event from the widget OnClicked.

[polar urchin]

Does a dedicated server start a session for you?

[dark edge]

No you still gotta start it.

[fierce oriole]

Hey How Do I Properly Test an Advanced Session? If I test by creating an Advanced Session with Client 1 (PiE as Client) and connect to the same session with Client 2 (also in PiE as Client) will that be sufficient? Or do I need to have 2 packaged builds on 2 steam accounts? Trying in PiE seems to break some server side code

[twin juniper]

Can anyone help me on how to do facebook login in unreal engine 4 using playfab??

[scarlet cypress]

Is that the right way to set up sprinting in multiplayer? (Not caring about safety)

[kindred widget]

@scarlet cypressPersonally, I prefer the other method. I'd really just make a simple bool property RPC from shift to set that true or false based on pressed or released and let your repnotifies handle the speed setting based on which state gets replicated to them.

[thin stratus]

If we ignore the fact that you can't make this correct in BPs anyway, as you will always get a correction at the start or end of your sprint, then this is still not 100% correct.

You need to use a RepNotify variable to set these values, otherwise you will have hot joiners or people that get into relevancy not see this change.

[oak jewel]

ive got animation to work
but
ammo stuff i cant find a way to plug in

[winged badger]

@oak jewel on server, access the UAnimInstance directly

and hook into its OnMontageEnded delegate

[oak jewel]

nah man dont want to touch animations been stuck on that 2 weeks and just got it fixed - just want to hook in ammo code (right)

[winged badger]

that is a weird set of conditions

make simple conditions into functions that make it more readable

like IsNotFullyLoaded

but you're starting a reload at the same time you're starting a montage

you load the ammo into a weapon and play some gun cocking sound when its done

note that your delay approach doesn't actually allow for reload to be interrupted, even by death

[oak jewel]

😦

so how do i do that then?

[winged badger]

timer that you can invalidate

or letting the montage itself act as a timer

[oak jewel]

phew

so i dont have to change it all

where to i add my ammo code then

[winged badger]

when the timer/montage is finished

[oak jewel]

note this code is just conditions for reload eg if no ammo dont reload

like this then

[winged badger]

DECLARE_DYNAMIC_MULTICAST_DELEGATE_TwoParams(FOnMontageEndedMCDelegate, UAnimMontage*, Montage, bool, bInterrupted);

if you use montage as a timer, then the boolean in the event handler is success/fail

the delegate braodcasts when montage is finished or interrupted

[oak jewel]

right i think i understood some of that

is this right

[winged badger]

you need to access GetAnimInstance, probably via GetMesh from character

[oak jewel]

that goes where

[winged badger]

then BindEventToOnMOntageEnded

[oak jewel]

which is now reload on / off

right?

[winged badger]

reload success/fail

after it plays

[oak jewel]

i dont have any event called reload success / fail

?

do you mean reload on / off

[finite goblet]

Does UE4 support IPv6 yet?

[regal storm]

Struggling with this one. I have a Blueprint Interface which triggers a connection between the player and an interactable station (steering wheel, in this instance)

In the actor containing the wheel logic, I want the logic to update across all clients (specifically, who is controlling the wheel, the wheel state (bools) and so on.

I pass the variables from the BP Interface through the Multicast event, but for whatever reason I'm not getting the expected output. No print strings from the server, and zero feedback on the clients.

My understanding of multicast must be flawed, but perhaps someone can shed some light on this for me? Thanks!

The only thing that prints is the Remote output from the "Switch Has Authority" to the clients, otherwise nothing?

I've tried setting the variables that get set by the server later in this BP to replicated and repnotify, no change there either.

I guess in case my further logic is flawed, here is what this eventually triggers:

"Target" in this context is the player

[winged badger]

input events only fire localy

server doesnt get one because client pressed a key

[regal storm]

Does the BP Interface event not then run everywhere?

[winged badger]

no

[regal storm]

So I would need an extra layer of custom events to 'Run on Server' first?

[winged badger]

any way for client to affect server in any way is a server rpc

[regal storm]

So something like this?

Or maybe I'm missing something

Because if that's it, it has the same result 😦

[winged badger]

what class is that in?

something like that yes, but without an authority switch

because its redundant after the server RPC

[regal storm]

This is in an actor class (that is set to replicate)

[winged badger]

note that PlayerController and GameMode won't work for this

as there are no corresponding instances of them on simulated proxies to receive an RPC

also, clients can't RPC from an Actor they don't own

which without additional setting of ownership limits you to Controller, Pawn and PlayerState

• their components

[regal storm]

Ahh, hmm that might be the issue then. (The ownership thing) I don't really want the actor to be owned by any client, as multiple clients can run this same logic in different areas of the actor.

Basically the actor is a ship, and the ship has 10+ places this logic could run, each of them by different clients

So would I have to put the Server RPC before the BP Interface call in the pawn?

And have the interface call running on the server

[winged badger]

the PlayerController sends a Server RPC, which manipulates the interaction target

[regal storm]

That's my interaction input logic

(in the pawn)

[winged badger]

interaction target through mostly replicated variables (+ RepNotify) notifies clients that is been interacted with, MCs are useful here only for effects, as its a stateful change

which MCs can't handle

you should probably lay off the crafting stations until you get everything else right, as that will be somewhat more complicated

@thin stratus i was about to link your compendium to Tyler here, but the link is dead

[regal storm]

Ahh haha, yeah that's why I'm here 😛

Aha, yeah running the execute on server before the bpinterface did the trick 🙂

Thank you 🙂 With a change to repnotify that all worked

I need to better understand what you mean about MC (MultiCast?) not being useful because it's a stateful change, but maybe the compendium will answer that when it's back online

However removing the MC, it still works so I'll read up on that later to understand more

[thin stratus]

Hmpf. Redid my page a while ago. Will see how to fix that

Thanks

[dull lance]

quick question on stuff...

would you advise to have a separate set of:

• PlayerState
• PlayerController
• HUD

for both the lobby / main menu and another one for gameplay, or do you just switch states and have their sets travel with the client to the match server? How do you generally recommend handling this information

[south rampart]

Is there anyway to automatically have different build profiles (client/server) use a different setting in DefaultGame.ini?

I'm talking about this setting

[/Script/Engine.GameSession]
MaxPlayers=30

Either from code or by some magin in the .ini itself 🙂

[twin juniper]

I'm setting EMovementMode::None to stop the player from moving, but also I need to apply a root motion force to that character with that movement mode. Basically I want to disable movement input for a few seconds and apply a root motion force while that is happening

[meager spade]

@dull lance we have seperate for mainmenu/lobby to gameplay

@harsh lintel disable movement input in the player controller

don't ever use MovementMode none

[torpid girder]

I am thinking about replicating a day night cycle. I think this might be slightly harder than simply creating an actor with a timer that increments a counter that periodically updates clients

I guess a few ms shouldn't have a huge impact

Maybe best to implement this in the gamemode/state

[lost inlet]

well not the mode seeing as that's not replicated

[queen pine]

Would anyone know how to prevent owner animations from playing in unison on other characters?
Or maybe what would cause it? I checked the default animations in the 3rd person animation blueprint and i don't see why that's stuff doesn't play in unison but mine does. I'm working on player turn animations.
--EDIT: I was using player controller in the cast to set a player ref in the animation blueprint. I changed it to try get pawn owner.

[regal storm]

Any idea why my float, which is changed/updated on the server, would arrive to the clients slightly different?

Clients always seem to be exactly the same as each other, but the server is often a few decimals off of the received value

[queen pine]

is this float a rapidly changing variable?

@regal storm

[regal storm]

It's changed by player input (holding A/D) but it's not changing when input stops

Counts between -1 to 1 depending on A/D key press

[queen pine]

are you passing the float on the rpc?

[regal storm]

The float is being set on the server and is repnotify 🙂

[odd iron]

Hello Guys ..
can i assign index for each player in multiplayer
..
because i have passenger setting in vehicle if i want to exit specific passenger using seat Index its exiting the last player who entered the vehicle

i want to save the unique seat Index for each player so when Player x Press E to dismount he will dismount not the last player ride

[pastel marlin]

Had a bit of a hard time understanding your graph without the full context so I will answer not based on your current code but more generally. Maybe for each seat you could keep a reference to the player controller or a null ref if no player is seated ?

[odd iron]

Yes im using an array storing the character reference according to seat id@pastel marlin

If that what you mean

[pastel marlin]

no I mean for each seat you have a variable referencing a player controller that you set when a player enter and leave

[odd iron]

Hm

You mean for example 6 variables if it have 6 seats and each time checking who want to exit it will dismount and clear the ref

[pastel marlin]

yep

[odd iron]

Also could work i have to try

I wish if i can possess all players easier😋

But since its just possessing just one controller

So yea

[rich cradle]

I am trying to create an equipment vendor that every player can use. The blueprint of the vendor has a Widget Component and players can interact with it using a WidgetInteractionComponent. But, my confusion comes from actually making the server do anything. As far as I know an Actor can have only a single owner and only a owner can all an RPC. And the server doesn't know widgets even exist. So I am a bit confused as to how to make this work

[pastel marlin]

you posses a pawn not a controller

[odd iron]

Yes but i mean i cant possess more than 1 in vehicle

Just the driver

[pastel marlin]

you mean your vehicle is a pawn and only the driver can possess the vehicle ?

[odd iron]

Yes

The other players just attaching

I searched the whole google and asked here for vehicle just driver who can possess and other passengers just attach and set their location

[rich cradle]

so what is the problem? UnPossess the driver and then possess the car?

[odd iron]

The problem with the other passengers not the driver

The driver you can just possess it to the driver seat and control the vehicle and using the vehicle cam etc

[pastel marlin]

I don't understand what your problem is anymore

[odd iron]

Haha

My problem with passengers

The driver working normally because it using Possess node for vehicle

But the rest of passengers im just attaching them to the seats

No because they are attached

[pastel marlin]

yeah and ?

[odd iron]

And here the rest

I cant control each passenger seperatly exiting them from vehicle

[pastel marlin]

okay i think i got it

either manage the exit from your controller

[odd iron]

If 2 passengers ride the car when i press E from 1st player the 2nd player will dismount because he is the last one who mounted

[rich cradle]

store playercontrollers in your seats not IDs

unpossess should be handled by the server

or unattach

[pastel marlin]

the problem he has is a pawn can receive input from only one player

but you just need to handle the exit from the player controller

not the vehicle

and your problem is solved

[odd iron]

I will try to handle this from PC

Because Seat index updating when player entering so i can check the array using the index

Otherwise i cant attach players to specific seat

I thought ican use this number to check the player who want to exit

This is the problem i spent 2 days trying to get an idea but my brain not working enough 😋

[pastel marlin]

You don't need the widget server side you just need to have the list of the item the vendor has

and to send the rpc once you choose which item you want to buy do it from the player controller or your pawn

[rich cradle]

so, client presses a widget, widget calls the function in the Vendor Blueprint to do stuff.
Then i am lost

the vendor has no idea what player controller interacted with it

unless I use a getplayerController in the widget and send it along, since thats always local

[pastel marlin]

client presses widget, it call a rpc to the server from an actor the client own (player controller or pawn for example) the rpc send which client, which item, which vendor and from there you know everything you need serverside to make the item transfer

[rich cradle]

then I would have to move my functions outside of the vendor to things completely unrelated to it

[pastel marlin]

you just need a rpc buy on the player controller which can then call a function on the vendor who deal with the rest of the logic server side

but as of my current knowledge you can't call a rpc to server if you don't own the actor so this is a way to avoid this problem

[rich cradle]

man, thats such a roundabout way of doing things, but I guess there is no other way

[pastel marlin]

okay @odd iron back to your problem on your vehicle, except the driver does other passenger need to have any interaction with the vehicle other than exiting it ?

[odd iron]

@pastel marlin yes i wish

Switching seats or shooting from windows

[twin juniper]

The function bound to an ActionBinding isn't activating a server RPC on the server, only on the client, is there a way I can fix this?

[odd storm]

Do we have any equivalent function in C++ with CreateSession in Blueprint?

[pastel marlin]

you wan't the c++ equivalent of the CreateSession node ?

https://unreal.gg-labs.com/wiki-archives/networking/how-to-use-sessions-in-c++

https://docs.unrealengine.com/en-US/ProgrammingAndScripting/Blueprints/UserGuide/OnlineNodes/index.html

[odd storm]

Ohh, so we don't have built-in one similar to the one in Blueprint?

[pastel marlin]

I have done it in c++ and it was more of an pain in the ass than anything and at the end I switched to do it in blueprint because even after using the tutorial it didn't work in some cases

[odd storm]

I see, not sure if it's better to use C++ for steam integration later or Blueprint one is good enough

[pastel marlin]

haven't published a game yet and didn't research enough to answer this question but I saw this https://github.com/mordentral/AdvancedSessionsPlugin which could work if the base function aren't good enough

[cunning shoal]

Hi all, has anyone experienced issues (I'm on 4.26.2) with replicating the location of an actor if you have any kind of root, and then child static meshes below it, and physics enabled? I have the SmoothSync plugin, but even doing it it with the built-in "replicate movement" doesn't appear to work for child static meshes, and if i tick the box for "replicate component" on the child objects, the meshes dont even show up for the client.... it's super odd

[odd storm]

@pastel marlin thanks a lot!!

[pastel marlin]

np

[queen pine]

https://youtu.be/6q6yA-uP6SA So i'm trying to add replication to a turn in place animation. It seems like its fighting something else but i dont see anywhere that would be. That's just what it seems like with the stutter. the animation is fine locally.