multiplayer

[graceful flame]

yeah

[distant turret]

Problem is i dont have a budget or spare money to pay for these services

[graceful flame]

Well you can have lots of cheaters by using a save file to store stuff, or you can try to setup and host your own database server, or figure out how to pay for a cloud db.

[sinful tree]

Community hosted servers with non-persistent data between those servers? Save game handled on the server's end is fine.
Community hosted servers with persistent data between those servers? Forget about it. It's completely unsecure and people can manipulate any server data, including things that aren't necessarily their own unless you're going to give each player their own login to your database, but still wouldn't recommend since players could then muck up whatever data is entered into your DB.

Company hosted servers (eg. you control the servers) then you can use save games or a database, but a database would probably be better as you can then also easily create external tools to access and manipulate the data if necessary.

[distant turret]

Thank you kindly hope to get further

[graceful flame]

So if you're making an mmo you pretty much have to host your own servers and use a database.

Unless its more like a sandbox type game (Rust, Ark Survival...etc) then you can have community hosted servers and they can track progress using save game on server but there's no data transfer between the individual servers unless you have a database like Datura said but that can open up a can of worms with new sorts of problems.

If you're making a co-op PvE or friends only type game and make it so the players host the games themselves (Listen Server), then you might as well not have a database and just use save game files locally because cheating is already trivial at that point. You could still setup a database and have secure persistent data (amount of gold) but only to find out that cheaters can still manipulate the game to "print gold" at their will.

[chrome quest]

If I want to send data from Server to Client without using Replicated variables, I have to use two RPCs right?

Basically a Client making a request to the server to retrieve data.

I would use one Server RPC that calls a Client RPC with the data as input, right?

Or is there any other method?

[short arrow]

yup, client will have to ask, server will have to return

no other way

[uneven chasm]

I have an actor that the server sets a variable on a component (replicated owner only) but on the client controlling that actor the component does not get this update. any thoughts ?

[chrome quest]

Great. I wanted to confirm is there's no other message passing system besides RPCs and Rep Vars.
I know about TCP but I'm not using that.

Thanks

[hybrid zodiac]

@uneven chasm make sure both the actor AND the component are set to replicate

[uneven chasm]

im dumb, thank you I did not have it selected in class defaults

[glacial ermine]

Well I’m using websockets atm and a custom server written in Go…

[chrome quest]

I've always wondered about custom servers. How do you maintain server authoritativeness?

Obviously a custom server can't perform movement simulations the way the one from UE does

[glacial ermine]

Yes this is one of the main issues. My current solution is a quick and dirty one, using collision tolerances and allowing the client to run around freely while I check the last 10 positions according to what the server has indicated. Any divergence above a threshold is “gently” corrected

But of course my game is forgiving of these issues

Not a competitive 3D shooter or anything

😅

[glacial ermine]

Actually what do you mean by “movement simulations”? I noticed the top down simulation does some pathfinding

I assumed you meant physics etc

[civic belfry]

I'm using the beta plugin for network prediction on a single physics ball and I'm wondering what the best practice is for where to apply impulse to the ball - would you have the server run the impulse only, or multicast it from the server to all of the clients. When I compare the two, multicast feels just a hair more responsive

but in my brain it feels like replicating the physics without multicasting the impulse should be more responsive since the next update the clients get would be the ball's position changing, instead of having to apply an impulse locally and then wait for the ball to get hit. I guess this is wrong though due to prediction? Local clients need to know an impulse happened in order to not try to correct the difference?

[uneven chasm]

repnotify function can only exist in the component the variable is in right?
Component A has variable, Component B has hud stuff I want to update. Can I create an event from a function on Component B with a target of component a ?

[glacial ermine]

Could this be because the client will apply the impulse as a “single event” therefore simulating the physics locally without waiting for position data from the server to be received ever so often (every tick of the server…?)

[civic belfry]

lol I gotta learn more about how this works but I think that's close to it. I think applying it locally results in less difference when it compares. Shits confusing but working so far lmao. The beta network prediction plugin crashes for anything complex but seems to work just fine for one physics ball and a few actors to smack it around. Fun stuff!

[chrome quest]

Oh, no. The current model is for UE to run the game, character movement and other stuff. Then replicate data to the client for them to run approximate simulations of the world.

This works well because client code is a copy of server code. Dedicated server.

With a custom server, you'd have to run the world somehow. I'm just wondering how?

Like if a character moves, does your server run the movement logic. If so how does it match UE's model

[winged badger]

i have no idea what you mean by "custom server" here

[chrome quest]

They have a Go server

[winged badger]

if the classes rep layout doesn't match, and i mean for any class that tries to replicate

unreal net driver will boot the client out

[static sable]

hi, when I call SpawnDefaultController() on my pawn to enable the behavior tree, for whatever reason, repnotify with COND_OwnerOnly doesn't work. It seems that when I set SetOwner(PlayerController) it somehow collides with already existing default controller. Anyone has clue how to fix it please?

[chrome quest]

This requires a UE dedicated server right?

[winged badger]

AIControllers do not replicate

you either use unreal networking, or you do everything yourself manually

doesn't matter what kind of server it is

[chrome quest]

Oh, I see

[winged badger]

you can enable AIController replication, but its off by default

also note that with Condition OwnerOnly, the Owner has to be set server side for it to work, too

[static sable]

thanks, but how to create association between AIController and my client's controller so only actual owner of the pawn receives notifications. Imagine RTS game where AIControlled units send certain notifications only to owning player

[winged badger]

turn on replicates and only relevant to owner

[split siren]

I forgot what is the debug command that shows the bounding box where "server" thinks the client is. It is used to compare the current "client" position and the actual server location. Do you know please?

[winged badger]

and set the owner on server right after its spawned

p.ShowNetCorrections

i think

[split siren]

Duh... Thanks!

[static sable]

so replicate AIController and SetOwner() of that AIController to playercontroller?

[winged badger]

yes, and you can turn only UseNetOwnerRelevancy

so the AIController Actor doesn't replicate to other clients at all

then it will be like PC in that scenario

[static sable]

thanks let me try that

[lime echo]

Hi there! I wonder what makes more sense to do when making a multiplayer game: Check the context before each chuck of code (IsLocallyControlled(), HasAuthority()...), or instead manage to spawn each class (Actor or Component) only on the context (Server, SimulatedProxy, AutonomousProxy) that is relevant to it. I thought about maybe destroying irrelevant classes in BeginPlay according to the context. What do you think?

[winged badger]

2nd approach has limited uses, but its also not how it was intended to work

[glacial ermine]

Yes it does. Mind you it’s rather basic and based on a top down template. So I’m essence it behaves like a 2d game. I send “commands” to the server indicating what the client has done and the server performs the actions, having a representation of the same “map” as the clients + all the dynamic objects (such as other clients).

[winged badger]

so its a pain in the arse to manage, and you really need to know what you're doing there @lime echo

[glacial ermine]

Collision is done via quad tree + simple aabb

[winged badger]

extra non scene component with the Tick off on an Actor doesn't cost anything

also, getting net addressing to work with locally spawned Actors/Component is much more involved then just having them on the CDO

[lime echo]

I currently use the first approach, but it seems like most of the code needs to run only in one context. It'll satisfy me if you tell me that the 2nd approach is not standard. I just want to make sure I'm following the best practices.

[winged badger]

think is

when you have a component on class default object

if the actor is net addressable, which means you can send a pointer to it owner the network

it automatically means that component is also net addressable, as it has a stable name (component name) relative to net addressable owner actor

as soon as you start spawning them, if you don't turn their replication on, that no longer applies

[lime echo]

So it seems like the first approach is the one to go with, right?

[winged badger]

which makes it easier, with virtually no performance difference, to just disable the component where you don't need it

instead of destroying it

[lime echo]

Great! Thank you!

[split siren]

Can I have a question about movement replication and moving platforms?
When a player with large ping jumps off and on a platform with replicated, constant linear movement, I see server correction and it makes sense because the platform is at different location when client lands/jumps off.
Possible fix?
My idea is during server FSavedMove replay also roll back the platform, but that seems like a lot of work (both coding and CPU time wasted), so before wasting days on this I wanted to pick brains of the far more experienced community members.

What confuses me is that the rotation FQuat StartBaseRotation; and location of the primitive component (platform) are already included in the FSavedMove_Character so I would assume UE prediction would handle this already.

More context - To get better at networking I wanted to make Fallguys type map with moving and rotating platforms.

[pallid mesa]

you are lucky as UT4 has a lift implementation you can use as an example

it deals with based movement and rollback

and yes, it is kind of coupled with the cmc

[split siren]

Oh lucky me! Thanks for the pointer

[chrome quest]

Right, makes sense now. Thanks for the explanation

[twin juniper]

hi guys

i want to make a online game using aws in unreal 5

but i didnt find aws sdk for unreal 5

i can only see aws sdk for 4.26

or 4.27

how to download for ue 5

dose aws skd for ue5 is there?

[split siren]

I am using the SDK for both 4.27 and 5.0.2/3

[split siren]

I wonder how many people made CMC cry so far.. We need a counter!

[twin juniper]

so it can work?

4.26 sdk

[split siren]

Yes, I am using this SDK with UE versions 4.27 and 5.0 without issues

[split siren]

Thanks for the UT Lift tip, but it left me more confused than before. I have read UTCharMovementReplication UTLift and UTCharacterMovement but found no extra code for base platform rollbacks (or anything similar). It uses the default "SetBase" call as in default CMC https://github.com/EpicGames/UnrealTournament/blob/3bf4b43c329ce041b4e33c9deb2ca66d78518b29/UnrealTournament/Source/UnrealTournament/Private/UTCharacterMovement.cpp#L1768

I am very likely missing something obvious, thus would you mind giving me more hints what to look for?

[pallid mesa]

oh, it was a long time since I last checked... as far as I remember I believe the platforms were rollbacked for hit registration but I dont remember the details or if I even remember them correctly, I'd have to re-check

[snow tiger]

#engine-source message

[split siren]

This does not seem to be related to multiplayer, but to your InputComponent, which is most likely not set in the settings.

[snow tiger]

do you know where to do this. also it says manual reset

[split siren]

Ensure if both of these are not null
If they are both set, it is something in your code that nulls the Input class for your actor

[snow tiger]

it was null and I am building again. ill let you know. thanks for the help

[split siren]

Next time I would suggest asking in the #cpp or #blueprint channels as I suspect you did not change anything in the engine source and it has nothing to do with multiplayer

[snow tiger]

i thought this channel also talking about windows server issues in multiplayer.seems i am mistaken. thanks for the heads up

[wheat magnet]

is actor blueprint owned by client?

or only character blueprint owned by a client?

what mean by this statement

[split siren]

Actor can be owned by PlayerController, which exists on Client and Server.

[wheat magnet]

so if i spawn an actor in client side, then server will spawn that.

but the owner will be server or the client who is executing that event to spawn

[wheat magnet]

by default?

[split siren]

If you spawn an actor on client, server will do nothing.

[wheat magnet]

unless i do rpc on client, right?

[split siren]

If you do an RPC on an actor that does not exist on the server, it will be ignored.

[wheat magnet]

how an actor can't be exist on server.

[split siren]

If you spawn it on client, then server will not spawn it on server side.

You need to spawn actors (that you want to replicate) on server side always.

[wheat magnet]

consider this example

[split siren]

And then if you want to allow certain client to use RPCs for that actor, you give that clients ownership of that actor.

[wheat magnet]

event run on server inside player character

[split siren]

Yes, that is asking the server to spawn the "New Blueprint", which is different than spawning it on client.

[wheat magnet]

if i make this event non rpc, then it only spawn on client

so no server and other clients can see?

[split siren]

yep

[wheat magnet]

so it means when i run event on server, then what exactly server does

server replicate that event to all clients?

[split siren]

The server spawns the actor on the server side. That's all the code does.
I guess your question is how does the "New Blueprint" actor gets to clients?
That is part of replication. If the actor has Replicates enabled, it (the actor on the server) informs all clients "Hey, I am at 100, 200, 0." and clients create the actor on their end.

[wheat magnet]

yes replicates set to true

[split siren]

And do your clients see the actor?

[wheat magnet]

of course

[split siren]

Wonderful

[wheat magnet]

that's the thing I'm trying to understand

the other question is "what is use of multicast" if server already informs to all clients with server only event?

i'm running event only on server. but server tells to all clients. however multicast do same thing?

[split siren]

Multicast goes from server -> all clients. Previously mentioned "Hey, I am at 100, 200, 0." is a multicast.
If you have a chest which one of the players opens, you can use multicast to inform all clients that it chest has been opened and it should play a sound.

[wheat magnet]

so every event gets called on server means all clients can see that event

but that event doesn't gets called inside each client, rather it just only server event?

[split siren]

No, only multicasts run on all clients.

[wheat magnet]

exactly. you mean server event and multicast is totally different

[split siren]

Yes

[wheat magnet]

server event = runs only on server and other clients can see what is happening on server

multicast = run that event inside each client blueprint graph

[split siren]

Not exactly, server event just runs on server. It does not inform clients if not further instructed

[wheat magnet]

well. that sounds like same

[split siren]

If you run Print("Hello") as a server event, it prints it only on server. If you run it as multicast it prints it on all clients

[stray thunder]

are replicated variables automatically inherently multicasted?

[wheat magnet]

i spawned cube in client side with server rpc. other all clients also see that cube and server also see that cube

so all clients can see

[split siren]

Yes, because it happens like this

1. You call server to spawn object
2. Server spawns object on server side
3. Object initializes and checks if it's replicated
4. object IS replicated and informs all clients via Multicast that it spawned

Spawning it on server and replicating to clients are two separate systems/events

[wheat magnet]

right now cube blueprint is set to replicated

and gets called on server

i didn't do any multicast

[split siren]

It did internally

If you turn the replication off, you will see it still spawns on the server, (steps 1-3) but it does not do the step 4

But it will exist on server

[wheat magnet]

correct. now i tried multicast. when i spawn on client, it spawn two times

[split siren]

If you spawn an object using multicast, it will ask each client to spawn an object. But that object is not "the same object" from the server perspective. So if you move the cube on the server, it will not move clients because those spawned their own version of the cube.

[wheat magnet]

yes that make sense. since server also spawn

[split siren]

So the correct way is to spawn it server and have replication turned on on the actor.

[wheat magnet]

great. from where did you learned these concepts? any video references or guide to become expert

[split siren]

Official docs + trying it out

[stray thunder]

pinned comments- 5th comment down

[wheat magnet]

ok got it. i already downloaded this book

when executing custom events with rpc, then it will necessary to pass parameters inside event? or they can be directly connected like in image

are both images have same behavior?

[stray thunder]

should be

yea

[wheat magnet]

ok

[stray thunder]

so, once you run something on server, you can't take that execution line and not have it running on the server, right?

you'd have to sequence that before the server calling node?

[wheat magnet]

only inputs passing with custom events or they inputs can be passed directly? like above two images. i thought they have different behavior

[stray thunder]

i don't know what you mean

the two images above are identicle

they will have the same effect

[wheat magnet]

images are not identical. but technically they might have same effect?

[stray thunder]

are you saying they don't have the same effect?

[wheat magnet]

well. that is my question

[stray thunder]

visually not identical - technically, identical

[wheat magnet]

thanks for clarification

[stray thunder]

question:
so, once you run something on server, you can't take that execution line and not have it running on the server, right?
you'd have to sequence that before the server calling node?

[wheat magnet]

yes

[plush wave]

How do I replicated variables that are in a component subclass?

If the component is owned by an actor does it just use the actor channel?

[wheat magnet]

can i set variables of game state from client?. or i can only read variables of game state inside client but not change them?

[latent heart]

Only the server can change variables.

If you want to change things, ask the server.

(You can set local variables to whatever you like, they may or may not get overwritten by the server at some future point.)

[woeful ferry]

Yes

[unique sparrow]

What is the best way to send a bunch of 10 different float properties all together to the client on demand when the client asks through a server rpc?
Simple approach is to pack all them into a struct and send. Is there a better way to achieve this?

[latent heart]

TArray would be pretty simple?

[unique sparrow]

From struct it would be easy to access the property, I can get it through struct.name instead of array[index]

[latent heart]

It really makes no difference which data structure you use.

[unique sparrow]

I am worried about the network performance when sending these many properties all together

I mean is there a ways to make it optimized over the network? Suppose the struct have 20 properties, still the normal flow would be all fine?

[solar stirrup]

20 floats is nothing

Depends how many times a second you send them over

And to how many connections

[fading talon]

about actor replication and garbage collection: if a actor is owned by a specific PlayerController and the playercontroller does vanish (becasue of disconnect or whatever).
does it also detroy the actor it owned? or does it stay behind like a unwanted child? or does ownership just jump up the ladder?

actor without ownership should not be possible. or can it?

[chrome bay]

It'll stay behind

Just without a valid owner

[fading talon]

so i need to explicitly need to brake it down if i don't need it anymore then...
good to know 🙂 ty

[regal geyser]

on EventPossessed I spawn BP_Chat for each pawn, also setting the owner of this BP to given pawn. But when in BP_Chat an event is triggered, it says that only server's Pawn is the owner (in Standalone, in PIE it works fine, also LAN it works in Standalone too, online not). Why?

It looks like Owner reference isn't replicated to clients. On server it correctly says who is owner, but how am I supposed to call ServerRPC inside BP_Chat when owner is only set on server?

[stray thunder]

i believe the rep notify is running on server, and i can't get it to get back to the client's pc to update the UI client-side

any ideas?

[woeful ferry]

Use dispatchers for updating UI

delegates

[stray thunder]

i'll give that a go

[latent heart]

Wait, what. When you walk over a health pickup, you damage the pickup to destroy it?

Why not just Destroy() ?

[stray thunder]

no, the apply damage send an int to the character that collided with it...

[latent heart]

So you're applying 10 damage to the player when they pick up health ?!

That's most bizarre.

Also, the red server part of your paste should be at the very top. Only the server should deal with collision with pickups.

[stray thunder]

you've missed the point

[latent heart]

No, I'm totally not helping with what your actual problem is. I'm just giving feedback on your methodology.

[stray thunder]

the event any damage is the server event

and that event can do damage as well as heal... its just an int

[sinful tree]

Is both your health component and health variable set to replicate?

[latent heart]

That's true, I just find it odd to do healing via a damage event!

[stray thunder]

you like to get hung up on the little things, don't you?

[latent heart]

I do.

[stray thunder]

i don't think actor components rep...

oh wait... they do

i think that was the problem

i thought they just inherited that from the actor

[stray thunder]

you fixed it - thank you

[devout granite]

Does anybody know how to send a rpc call from client to server in unreal ? I am able to update the clients with events or variables over replicates but cannot update the server :D

[quasi tide]

That's what a Server rpc is. Can only be called on actors the client owns.

[twin juniper]

this compiles despite giving the error, and OnRep_ItemSlots is an onrep function in parent class that is overriden. will this still be properly called?

[solar stirrup]

Did you UFUNCTION() it?

[twin juniper]

oh no I did not

[twin juniper]

well yes I did in the parent but tried in child and it got rid of error but then didnt compile

[solar stirrup]

i'd just make a new on rep function

and just call the other function in it

[unique sparrow]

Can any talented peep tell me any talented idea to make a player's talented property only replicate to his talented teammates?
Thanks for your talent in advance.

[prisma pelican]

does stuff inside animbp need to be replicated

[solar stirrup]

anim blueprints don't get replicated

you'll have to replicate the state of the character and use that in the anim bp

[unique sparrow]

coz Anim blueprint are not talented

[solar stirrup]

Keep the properties in a proxy actor that is only relevant to his teammates

[prisma pelican]

@solar stirrup okay thanks!

ill look into that

[unique sparrow]

Thanks my talented frient

friend

[prisma pelican]

@solar stirrup why does my animations still play on both server and client if animBP doesnt replicate?

shouldnt i only see it on client side?

[stray thunder]

do you want it to?

[stray thunder]

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

idk if that's your problem but it might help

[plush wave]

Guessing this is built in? Or is there some sort of setup

[short arrow]

That's not how it works, everyone is fucking the animBP replicated or not. If you don't want it to tick for server then you need to set that

[slim terrace]

having a bit of jitter client side, have a pawn that has forces applied to it on tick on server side but movement replication is jittery

any way to smooth the movement?

playing as a listen server is fine though

[split siren]

Looks like you are missing client-side prediction, which is a bit complex topic, but you can read up on it in CMC. It is probably not going to be easy journey to understand if you have not dealt with client-side prediction before, so I wish you best of luck.

To do a proper test of your current system I would recommend adding some lag using net pktlag=200 and see how the car behaves with some non-minimal lag

[acoustic drum]

You could do what PavKon said and look into client side prediction, unreal engine should be able to do a lot of the heavy lifting for you or you can just do the same calculations on the client that the server does and pray they stay in sync

[uneven chasm]

Curious to get some multiplayer thoughts on best approach.
Context: I have 2 components and a hud widget

1. component A manages health equipment and other related variables/bps
2. component B manages all the different ways you can take damage
3. hud widget with a event that updates health ui. this event takes an input of health & max health to do a % for the widget bar. Then it sets the current health / max health text getting the health values from component A

The problem:
component B sets component A sets health to the new value after damage is applied and health is replicated, owner only.
then component B calls widget event to update ui but the event updates the bar correctly as the data comes though the input correct but the text being set for current health/max health gets it from component A and is always one "attack" behind on its value.

flow is something like this weapon collision anim events (component) -> taking health (component) sets equipment (component) health variable AND calls Hud update event which gets the replicated health variable

Is the event being called to quickly for replication of the health value to happen? Its always one "hit" worth of damage behind

[sinful tree]

Your game logic shouldn't really call changes to UI directly. Use an event dispatcher in your components and call it whenever your health changes (Health should be an OnRep variable, yes? Put your call to the event dispatcher in the OnRep function) and have your UI bind to it so the UI can update itself. This gives you additional flexibility in your UI in case you want other things to happen whenever a player's health value is changed, or you decide to scrap the UI entirely.

[uneven chasm]

its replicated, owner only and all the interactions are through events

[sinful tree]

What is owner only?

[uneven chasm]

health variable

[sinful tree]

Why?

Other players don't need to know the health?

[uneven chasm]

yea eventually just getting it working for its own hud 😄

just to make sure if i wanted it replicated for everyone else is that leaving it with no condition ?

[sinful tree]

Then it doesn't need to be set to owner only - no condition is fine.
Regardless, your Health Variable should be "Rep w/ Notify". That'll create an OnRep function that'll be called whenever the variable is replicated.
The OnRepFunction can then call the event dispatcher.

In the OnConstruct of the UI that cares about the player health, you bind to the Component's dispatcher, so you'd have to get a reference to that component within the widget.
You can also make the event dispatcher pass values as well, so if you do, then on the receiving end in the UI it can directly read the values from the dispatcher without having to get reference to and look at the variables in the component.

Later on if you're wanting to see other player health values, you'd do the same thing - get a reference to the component that contains the health of that particular player, and bind to the event dispatcher to listen to values changes in whatever UI you want to see the value.

[uneven chasm]

Makes perfect sense, Ill let the component dealing damage just worry about applying the damage, add the OnRepFunction and tell it to call the ui events which should guarantee all the numbers are the same at that point

@sinful tree thank you for guiding and validating that direction 🙏

[slim terrace]

thank you! i went down a rabbit hole researching this but i found this to help

https://www.youtube.com/watch?v=RYo2-uvZ_i8

[clear copper]

how can I set Seamless Travel depending on how I'm testing? I'm so tired of turning Seamless Travel on for testing in steam then having to turn it off when testing PIE.

[stray thunder]

so, mystery time...
why when i pickup a health pickup the listen server logs it twice, but the client logs it once?
everything works fine, but its just weird and i want to find out what it is if i can before i move on.

I load in and they both update to max fine.
the server actually loads the default color of the progress bar after it loads correctly, but I just use the same color np.
then i hit a button to take damage and 2 of them show up. Then I run over the health pickup and 2 more show up.

[clear copper]

That's kind of the worst way to update a health bar

it seems more complicated than necessary

[stray thunder]

you have no idea what i'm doing

[acoustic drum]

Can you debug it then check the call stack to see whats calling it twice

[stray thunder]

let me try that

[acoustic drum]

If you can figure out where the initial trigger is coming from then you've basically solved your problem already. You can hopefully do that using the call stack or maybe even the execution trace

[sinful tree]

In what class are you creating your widget? Character? PlayerController?

[uneven chasm]

@sinful tree does a repnotify function run on the server too if so and I am just updating the hud then I should switch auth remote path is my thinking

[sinful tree]

In blueprints it does. Can't use HasAuth node within a component though, you'll need some other way (maybe just an IsServer check?)

[uneven chasm]

yea isserver check will work

[karmic shuttle]

would anyone know why this doesnt seem to be changing?

this is on an actor in the world

[sinful tree]

The actor probably isn't owned by the player that is making the call to SetSelectedArena. You probably have a warning message in your log indicating something along the lines of "no owning connection..."

To fix, replicate the selection through a player owned actor, like the player controller, then when running on server hop over to the actor.

[karmic shuttle]

it should now, ive made an adjustment to forward owning client -> server

its a modkit btw if that clears up some confusion lol

[rancid monolith]

Is "rollback netcode" a common thing in FPS or other online games that use projectiles? I'm imagining a system where a client fires a projectile, and the client immediately sees the projectile spawn and start moving, and then when the server knows of the projectile's existence, it places the projectile to approximately where the client is currently seeing it, predicted based on latency

I don't imagine I'm the first person to have thought of that

Anyone know if that sort of thing would be hard for a beginner (in terms of online multiplayer) to implement?

[rotund onyx]

Ok I have a very basic question because I am doing something wrong. Can someone show me a node setup that sets a replicated variable?
For me my clients seem to get two calls of a function. So if I increment a number by 1 they get 2 instead. I don't understand why this could be, but I'd really like to see an example of something that works, because I can't find much online.

The other thing is spawning an actor, and no matter how I try I can't seem to get that to work either

I can call a server event in order to spawn it and still it only happens for the client. I just don't get it

[sinful tree]

Jokes aside....

For replicated variables you typically only want to set them when you know you're running on the server.

[rotund onyx]

So I definitely don't want to set them in a multicast then

[sinful tree]

No

[rotund onyx]

When is multicast actually useful? So far it seems like every case where I try to use it is wrong

[sinful tree]

When you have some kind of event you want triggered on all clients. Like playing a sound or visual effect.

Something that is fire and forget.

[rotund onyx]

So basically visual stuff, never actual gameplay

[sinful tree]

It can be gameplay oriented too, but there may be a better way of doing it.

[rotund onyx]

Hey I'll be happy to cut multicasts out of my diet

[sinful tree]

It's just an event that you want triggered and all relevant clients to respond to.

[rotund onyx]

Do you have any idea why I might have events that trigger twice for the client but not the server?

[sinful tree]

In other words, it's like making a "Run on Owning Client" but making all relevant clients do something.

[sinful tree]

Without seeing code I couldn't really tell you. Best guess would be that maybe you're calling something only on the clients.

[rotund onyx]

It's basically just calling a server event on the player controller, which then calls a server event on an owned object

[glacial ermine]

Can anyone suggest a good tutorial for multiplayer coding where the focus is scale of numbers of concurrent players to the hundreds? Think Diablo style game not battlefield if that makes sense.

[rotund onyx]

If I call a server event in a player controller, which then calls an event in another actor, does that other event also need to be a server event since we would already be in one?

[fathom aspen]

You can try calling SetOwner anytime after you call SpawnDefaultController though most probably this will cause issues to your NPC. If it doesn't work as intended, you probably have to spawn an actor that is owned by your PC and that each NPC pawn references and changes its values. I'm still not sure what you're trying to achieve with this though.

[sinful tree]

No. Once you're running on server or client, any non-RPC events will execute on the client or server depending on where you're running.

[fathom aspen]

I doubt you'll find any. Your best bet is to explore the so called "Replication Graph"

[glacial ermine]

Oh damn, thanks mate. I want to get something simple off the ground as a PoC. I got feedback that unreal eng as a server was designed completely for 3D shooters and matches (I mean it’s unreal after all) and if I wanted to break out of that mold into a persistent mmo type world I’d better look at dedicated solutions.

But educating myself a bit more I see that there are no player limits per se. So if your unreal server is simple + well done = you could handle hundreds of players.

I think I’ll continue down my track of having a custom server and use Unreal mostly as a front end + renderer and communicate via websockets initially

[fathom aspen]

Oh yeah an MMO. Not many MMOs that I know that was made with UE. The only one I can remember now is Lineage 2 Revolution, which I'll wager they done too many modifications to the engine so it suits their game. Since Fortnite came to the scene, the RG was introduced and it's pure gold tbh. Though I doubt it will be enough for an MMO. Good luck, unleash your creativity!

[twin juniper]

hi guys so iam following AWS for unreal tutorials

https://www.youtube.com/watch?v=Sl_i6YIgQqg&list=PLuGWzrvNze7LEn4db8h3Jl325-asqqgP2&index=5

in this video

iam getting this error

[magic furnace]

seems like some target is not set

[civic belfry]

Dumb question, but is it normal for a multicast event to update only the clients, not the server lol? This doesn't update the server's variable when on multicast, but does when set to run-on-server with the variable set to replicate

[winged badger]

that is a really bad way to run a timeline

you're replicating a variable that changes on Tick

and the time flows at the same rate on server and all connected clients

[civic belfry]

lol yeah when you put it that way...

guess I should run the timeline without replicating anything, then replicate the result when it stops eh?

[winged badger]

Timeline is a full ActorComponent that does its stuff on Tick packed into a single node

you should replicate start/stop events

but they can handle the update on their own

always simulate everything you can get away with

[civic belfry]

ahhh ok! That makes sense

thank you~!

[thin stratus]

Does a Non-Possessed Character not cause Overlaps on ServerSide? :<

I have a Character that moves forward by default (custom CMC). It works all fine if the Character is possessed, but as soon as I unpossess it, it won't trigger the Overlap on the Server anymore.

Neither Hits nor Overlaps. Guess I'm stuck trying to see where that is filtered for no reason

[civic belfry]

doing something similar lol. My hits are like 50% from the server. Haven't figured out wtf's causing it yet. Characters are possessed in my case so it's going to be me being a n00b again

[unique sparrow]

Does the player state & player controller persist when a user disconnects? Suppose we want to make him reconnect, so a new player controller is spawned? and what about the playerstate?

[split siren]

They get deleted as far as I remember, but you can make a state copy (your FStruct) on disconnect

[unique sparrow]

Playerstate too gets deleted?

[split siren]

I believe so

[winged badger]

player state gets duplicated and stashed into inactiveplayer array in gamemode

[split siren]

I was wrong then

[winged badger]

you can override OnDeactivated on PS to stash any additional data you need to restore player on reconnect (c++ only i think)

as the unique net guid is unique for a particular service (like Steam) the engine is able to match reconnecting player with their inactive player state

it lasts for 5 minutes before its deleted

[fathom aspen]

CopyProperties can be overridden too, though it intersects with the fact that it's called for seamless travel too

Though you got Reset() in that case

[winged badger]

copy properties is not meant for this

[fathom aspen]

It is

[winged badger]

as you are likely to need to pull some data from the pawn itself

in order to restore it properly on reconnect

copy properties can't do that

like, make it reappear on the spot it disconnected from

requires PS to know Pawns disconnect time location, which it normally doesn't

[twilit radish]

Hey, does anyone know if Unreal has a callback for when a user presses this button in the Steam overlay? 🙂

[winged badger]

OSS has OnSessionInviteAccepted i think for that

or something very similar

OnSessionUserInviteAcceptedDelegate = FOnSessionUserInviteAcceptedDelegate::CreateUObject(this, &USolsticeOnlineSubsystem::HandleSessionUserInviteAccepted);

[twilit radish]

Thank you! 😄

[fathom aspen]

Wondering why that happens? I mean CopyProperpties is called before OnDeactivated is called, so it makes more sense for CP to win over OD 😄

[winged badger]

for copy properties to work

PS has to have all the data you need already

and for restoring disconnected players, it often doesn't

even if you had the foresight to put your inventory on the PS so it remains

you still need more

i have a FDisconnectedHeroData struct in PS

that gets populated exclusively from OnDeactivated override

[fathom aspen]

Hmm... I see. I should play more with this then. I mean it's really strange that CopyPropreties is the one called inside Duplicate. If it causes issues, then we've all been misled 😦

[winged badger]

i mean sure

you need that data

but

you usually need much more

[fathom aspen]

Yeah unless, you fall in that hole, you never know it

I was also wondering how transient properties and non-uproperties do really persist. They get copied with no issues whatsoever.

I asked the guy what was his real issue though and he didn't remember 😄

He just didn't duplicate the PS, but kept the original one, which feels like counter attacking the engine, and that solved it ^^

[split siren]

While the experts are here, I wanted to ask about CMC client-side prediction on moving platforms.
When a client with high ping jumps up while on a moving platform, it triggers correction (both when starting the jump and upon landing).

While running on the platform it behaves correctly. I assume the correction it is due to the fact location used in saved moves is relative to the base (primitive character is standing on), so when user jumps we switch from relative to world space.

Is there any way to fix the correction when jumping on a moving platform?

My first attempt was to teleport character to the location client said it performed jump (which is unsafe) before executing PerformMovement, but that also resulted in big location delta and correction.

[winged badger]

we either did that, or flirted with the idea, i don't remember

[split siren]

https://www.youtube.com/watch?v=FgXDWC6fSsA

[twilit radish]

I think this is not what I was searching for, my bad. To clarify I want people to be able to join through this way but it doesn't work by default and I'm not sure why 😦

[fathom aspen]

I thought only primitive data-types bypassed it, but I tried with more sophisticated ones, and they work too. I mean I'm expecting some gotchas there man 😛

[winged badger]

im always expecting glitches

[thin stratus]

    /**
     * If true, movement will be performed even if there is no Controller for the Character owner.
     * Normally without a Controller, movement will be aborted and velocity and acceleration are zeroed if the character is walking.
     * Characters that are spawned without a Controller but with this flag enabled will initialize the movement mode to DefaultLandMovementMode or DefaultWaterMovementMode appropriately.
     * @see DefaultLandMovementMode, DefaultWaterMovementMode
     */
    UPROPERTY(Category="Character Movement (General Settings)", EditAnywhere, BlueprintReadWrite, AdvancedDisplay)
    uint8 bRunPhysicsWithNoController:1;

Run PHYSICS With No Controller

Table flip material

[fathom aspen]

So this is true by default then?

I mean that means turning this to false won't let the character keep walking, preventing him from going into that trigger box?

[thin stratus]

It's false by default

Yeah, I mean the char keeps moving

But doesn't trigger overlaps for server

Setting teh boolean to true makes it work

[fathom aspen]

Good find! Goes and writes down notes

[winged badger]

you'd typically do const FData&, UHT might even enforce it for an RPC

[graceful flame]

Use p.shownetcorrections 1 in console to visualize the capsule corrections. It looks jittery to me because it’s lacking animation blending.

How much simulated lag are you using?

[unique sparrow]

How to get data from a player state of a disconnected player like name, team ? As I read that player state gets destroyed on disconnecting.

[wheat magnet]

what is playfab platform? and what is use of that in video games?

[chrome bay]

By default it doesn't get destroyed instantly, it gets put into the "inactive" player array in the GameMode for five minutes and is then destroyed. Why would you need to access that info though?

[wheat magnet]

is playfab dedicated server?

or is it just like steam/eos?

[graceful flame]

Maybe store a copy inside of gamestate?

[unique sparrow]

In the playerstate, I am storing my teammates playerstate. Suppose a player is disconnected and his pawn will remain there. If someone kills him I am broadcasting a multicast from victim playerstate with killer and victim playerstates as arguments to the multicast. where everyone locally checks if the player died was teammate by checking properties stored in the playerstate.

[unique sparrow]

Since player state is always relevant so it makes sense to put all stuff there. But if a player disconnects thats a trouble.

[chrome bay]

Well technically if the player has disconnected, they are no longer a Teammate

That's fine but so long as they aren't in the match, they aren't playing and not gameplay relevant. So really that pawn should just be nuked, then you spawn a new one and reassign them as a teammate when they rejoin.

If you disconnected from an online game, it seems unfair to allow other players to kill you while you aren't playing, then rejoin and suddenly be +10 deaths or something

[graceful flame]

I think naman wants to keep the disconnected player’s name and score.

[chrome bay]

you can keep that just fine

The player state will be automatically assigned back to the same player if they rejoin within the window

[unique sparrow]

Within 5 minutes?

[chrome bay]

IIRC that's the default yeah

[unique sparrow]

When a player rejoin, a new controller is spawned right? So it will be assigned when we repossess the pawn?

[chrome bay]

You won't repossess the pawn, a new pawn will be created

[graceful flame]

So during the 5 mins their data is available under InactivePlayer array

[chrome bay]

The old pawn should be removed when they leave

Which IIRC is the default behavior

[unique sparrow]

And how to let the game server know that the inactive player state have to be assigned to this new player again.

How do we assign the player state again

[chrome bay]

The engine does it itself

[unique sparrow]

Is it something like device id?

[chrome bay]

It uses the uniqueID of the player from whatever online service you're using

[unique sparrow]

How does the engine keep track?

[chrome bay]

See AGameMode::FindInactivePlayer

[unique sparrow]

Oh ok. Thanks a lot

[reef cave]

how would i sync procedural generation onto multiplayer? Right now i have it that one client has a combination of blocks. But on the other client has a different combination of blocks. How would I make them have the same combination of blocks?

[sinful tree]

You use random variable from stream nodes in combination with a shared seed for the stream.

Depending on how big the proc gen is, you could also just make the actors that are spawned replicated.

[reef cave]

well its not spawning actors, its destroying actors and leaving the others left over

[sinful tree]

Same thing. If marked as replicated, then it can be handled by the server and destroying them should remove from everyone else.

[reef cave]

i have the left over actors as a variable, how would i change said variable to be replicated?

wait i think i just found it

no i didnt

[sinful tree]

Why would you need to replicate it?

[reef cave]

wait

i found it

i think

hold

yes i think

i think...

it works

[unique sparrow]

If we increase the ConnectionTimeout, can we prevent the player state begin put in the inactive array?

[chrome bay]

No, there's a dedicated setting for it. You can't have them stick around forever though, or you risk the server being inundated with inactive players. Remember they still replicate even when inactive.

[graceful flame]

But what would be replicating if there's nothing changing? Is there some sort of overhead happening per tick deep within the engine somewhere?

[sinful tree]

I think at worst it would be doing relevancy checks? Thing is, you still don't want them staying around permanently as that's effectively a memory leak. As more and more players disconnect/leave the match, more and more memory will be consumed holding on to their inactive playerstates if they don't return.

[graceful flame]

Ahh, that makes sense.

[unique sparrow]

Assuming the player is never disconnected, still the server is running with replicating everything the character is doing. If he is disconnected, even though he is stuck around, it is relatively better right? Taking that into account, we might consider increasing the connection timeout if I am not wrong?

[unique sparrow]

That might be the case for MMO games where server is running forever. But for short session based games we might consider doing that?

[sinful tree]

You'll still run into issues. For example, someone malicious may figure out they can crash your servers by constantly joining and leaving under different accounts as the number of playerstates builds up and eats the available RAM.

[unique sparrow]

We don't allow joining midway. What we want is to start the match with the prejoined players. And only if the joined players disconnect, they can reconnect. In that case it might make sense to increase timeout ?

[queen flower]

trying to make a simple chat

I have functionality working for the local player, when they send a message, but doesnt show up on other clients.

Is it the events replication that needs to change... or am I supposed to create the chat widget somewhere else besides the players, like on a game mode or game state or something?

Basically, how do I get the message to be created on other players? Do I NEED to be connected to steam or some other server. Atm playing as client, and as listening server, return the same result.

my understanding is that player controller 0 is local player.

[solar stirrup]

Are you calling the RPC in the widget

Widgets don't replicate

[fathom aspen]

I'm wondering how it did show up on that client 1 screen

[solar stirrup]

Probably the client who wrote the message

[fathom aspen]

I mean if it was a listen server I would be ok

[queen flower]

The custom event is on the widget, and that custom event is set to replicate.

[solar stirrup]

If you want the message to show up on other clients, you need to send it to the server through an actor the client has ownership of, and then to the other clients from there

Widgets only exists on their clients, so they never replicate

[fathom aspen]

Yeah that's it probably.

[queen flower]

I do have a HUD class but that is just another widget.

[fathom aspen]

Ah ok. Here it is

Widgets don't replicate. So you can't RPC

[queen flower]

Hey Exi. Thanks for your documentation.

[fathom aspen]

The doctor has came

[thin stratus]

Chat messages are usually send through the PlayerController or a replicated component on them

[fathom aspen]

There is a system already in engine. ULocalMessage thingy

[thin stratus]

Which should be accessible via GetOwningPlayer in the Widget

If you supplied it when spawning the widget

You can then push that into some replicated array or so in the GameState. Or send a multicast if you don't care about chat history

+- limiting that array in size so it doesn't grow too much. Specially in blueprints

[queen flower]

I like that idea for chat history. Save all messages to an array.

I am creating the chat widget in the HUD I mentioned. Youre saying I can create it there but need to provide this owning player with get player controller?

[fathom aspen]

It would work. But it might not work as you expect sometimes, that's why he said GetOwningPlayer

See his compendium, he explains what GetPlayerController(0) returns on different configs

[unique sparrow]

Changing net update frequency at runtime not working. Do we need to enable adaptive frequency update to manually change netupdatefrequency too?

[queen flower]

so when its created I should use GetOwningPlayer instead of GetPlayerController 0. The engine just knows who the OwningPlayer is?

[fathom aspen]

Yes. HUD is owned by a PC

Even spawned by it

So not that hard to tell who is who

[thin stratus]

CreateWidget has an owner pin

Which you should usually supply

It's important to specify it

Imagine a split screen scenario

Good to make it a habit right from the start to stay relative to classes by getting them like this instead of using static getters

[queen flower]

right. Bad habits from making lots of single player games lol. Very rigid systems.

Do i have to be using steam or eos for this to work?

[thin stratus]

No

[queen flower]

so i am giving it (main menu) an owner on creation. Chat widget is attached as a child.

And giving the "create chat message widget" node an owner too.

the custom event is running on owning client, because we are targetting owners of the widgets so thought that was a good idea.

btw I read the compendium haha and reviewed several times.

Some stuff dooesnt stick so decided to use this chat as a way to practice and get real understanding.

here is the play settings so we're on the same page

[unique sparrow]

anyone?

[sinful tree]

Widgets don't replicate.

[queen flower]

Even if you tell them too lol!?

[sinful tree]

Yep, there's no replication supported in widgets, either RPCs or replicated variables. Dedicated servers don't even load widgets.

[queen flower]

So a local player types and sends a message and then somehow other players have to get the message themselves

[sinful tree]

A global chat message flow would be like:
Submit Chat message > Get Player Controller > Run RPC to Server on PlayerController sending the message > Server Gets Game State > Server Runs Multicast with the message + sender data > Multicast updates UI somehow of incoming message.

Probably best to do an event dispatcher in the gamestate, then your UI can just bind to it when its constructed and receive messages automagically.

[queen flower]

ok I will try and process/setup the steps you laid out and most likely be back haha

[regal geyser]

What is the difference between Event Handle Starting New Player and OnPostLogin? And which is better to use in a gamemode that waits for all players to connect so it can start the game? (I've also found out several forum threads complaining that one or the other doesn't work in seamless travel, don't know if it's true, but I use seamless travel)

[queen flower]

I really appreciate this haha!

[latent heart]

That font.

[sinful tree]

ComicNeue (Not ComicSans XD)

[latent heart]

Still awful!

[fathom aspen]

Yes the latter doesn't work for seamless. HandleStartingNewPlayer works for both seamless and hard, that's why it's preferrable

[stray thunder]

The attacker does damage to another char. hp works. the other char doesn't fall down dead, but the attacker does.

Is this a targetting problem or networking problem?

[fathom aspen]

This is most probably a GetPlayerXXX(0) problem

[stray thunder]

ok i see it thanks

solved it awesome

[kindred widget]

While not bad practice, this is only required for widgets created outside of the controller, or an already owned widget. So if you're three widgets deep creating rows for an inventory that was already specified by the container that created and opened the inventory, it's not necessary to worry about. Basically as long as you specify the owner on the main widget that creates and owns the rest, you'll be fine ignoring that. Amusingly, there's no HUD check here. I wonder if I could PR that...

[graceful flame]

How do you play audio and effects for something like a weapon immediately for the player who used it while also playing the audio and effects to other connected clients without hearing / seeing them twice? The player who shoots the gun hears/sees the shot and the network delayed shot when using a multicast.

[fathom aspen]

In the Multicast: Check if IsLocallyControlled? If yes skip.

I was right after all xD

[graceful flame]

I moved the audio component to be on the character firing the gun instead of the bullet and play the audio using the actor's location which I can now hear once per client because I'm checking isLocallyControled.

[fathom aspen]

Yeah makes more sense for it to be on the pawn

[fathom aspen]

Are you sure the PlayerState still replicates even when inactive? I'm aware of the OverrideWith non-sense but I don't think that has to do anything with this. I mean this is what I see when I look at this sane source code at least:

// AGameMode::AddInactivePlayer

// make PlayerState inactive
NewPlayerState->SetReplicates(false);

// delete after some time
NewPlayerState->SetLifeSpan(InactivePlayerStateLifeSpan);

[fathom aspen]

You also probably don't need to play anything on the server in case of a dedicated server.

[queen flower]

for multiplayer, is it best to create HUD and add to viewport within the HUD class, or should I do it in the controller?

Ive always just done it directly inside the player character but have the impression that is no good for multiplayer.

[quartz smelt]

Are there any huge risks/issues with destroying/respawning actors repeatedly on servers?

[fathom aspen]

It's not really a question of multiplayer as it's a question of better practices and better code management. You can go for both ways as long as you know what you're doing. Though using the HUD to create widgets is better as you've got one instance for each client which is easily accessible from the PlayerController. Also UMG code inside PC can bloat that class very quickly resulting in a less optimal class

TLDR: Use the HUD to manage your widgets

[fathom aspen]

That's a very generic question. Nothing specific I can think of actually. Though that results in more cpu cycles and strain on the server

[quartz smelt]

Awesome awesome, ty bro

[queen flower]

Ok so then Im having an issue then with referencing my HUD within the player controller. Ive set it as a variable at begin play but the cast is failing. This feels super basic but no clue why it failing.

This is within the playercontroller

[fathom aspen]

Have you specified that HUD class in your GameMode settings?

[queen flower]

yep

[fathom aspen]

Ah ok BeginPlay

[quasi tide]

When does the HUD class actually get created 🤔

[fathom aspen]

So BeginPlay is called on both ends. server and client

[queen flower]

thought perhaps playercontroller begin play ran before HUD begin play had a chance to create the widget.

[fathom aspen]

PostInitializeComponents

Before BeginPlay guaranteed

[queen flower]

I added a 1s delay for the playercontroller begin play, before the casttoHUD, and still fails.

[fathom aspen]

HUD is client only, so when runs on server you get that error @queen flower

[quasi tide]

Never use a delay node in multiplayer

[queen flower]

just testing the sequence of events

[fathom aspen]

Use a switch has authority with the remote pin there

[fathom aspen]

Nope that's not the case. See what I wrote

[queen flower]

So i want to store the HUD in playercontrollers begin play, after a switch HasAuthority from its remote pin?

[fathom aspen]

Yes

[queen flower]

like that?

The HUD for sure is created so no idea why this is failing.

[fathom aspen]

Are you sure you are executing that breakpoint xD?

[queen flower]

Am i also supposed to have a switchhasauth for when the hud is created?

[quasi tide]

@fathom aspen From what I can tell - HUD gets created during PostLogin.

In the GenericPlayerInitialization(NewPlayer); call

(Which should still be before begin play, I know)

[queen flower]

yea lol that is for sure executing. the red arrow appears and I am snapped to that node when it does.

[fathom aspen]

That tells the client what class to use

[quasi tide]

What is that from?

[fathom aspen]

Save all, close, relaunch lol

[sinful tree]

You have HUD Main Menu set up as the HUD in your world settings?

[queen flower]

yep

[fathom aspen]

My next blog post

[queen flower]

ok lol

[stray thunder]

Is it better to us interface or delegate when communicating with game mode?

[fathom aspen]

What works best for you?

[queen flower]

relaunched and same issue. If youre not apposed, willing to share my screen to save time.

not in hurry lol just feel like with the amount of things that could be wrong.. might be worth going through the steps.

[fathom aspen]

There is nothing more I can provide than what I did

It should work fine

[quasi tide]

That seems so wasteful to do this twice. PostLogin gets called even in non-network scenarios. In there it sets the HUD as well. PostInitializeComponents will set the HUD only if is a client as well.

[fathom aspen]

Shit I didn't ALT+G. Let me take a look for a sec

Hmm

/** Spawn a HUD (make sure that PlayerController always has valid HUD, even if ClientSetHUD() hasn't been called */
virtual void SpawnDefaultHUD();

[quasi tide]

In what scenario would it not be called?

[fathom aspen]

PostLogin doesn't get called when seamless traveling

Ok but if it was spawned already where does it destroy the old one? Or skip spawning it?

[quasi tide]

ClientSetHUD will destroy that one

/** Set the client's class of HUD and spawns a new instance of it. If there was already a HUD active, it is destroyed. */
UFUNCTION(BlueprintCallable, Category="HUD", Reliable, Client)
void ClientSetHUD(TSubclassOf<AHUD> NewHUDClass);

[fathom aspen]

I see. Why the hell it's done like that though?

[quasi tide]

dafuq if I know.

There has to be a situation that we're just not seeing.

Either way - HUD is created prior to begin play 😅

[fathom aspen]

Probably for doing some mysterious stuff I haven't known yet

Wow, I have to look into that

[quasi tide]

void AGameModeBase::PostLogin(APlayerController* NewPlayer)
{
    // Runs shared initialization that can happen during seamless travel as well

    GenericPlayerInitialization(NewPlayer);

First comment mentions seamless travel.

[fathom aspen]

Yeah because it's called inside HandleSeamlessTravelPlayer

// Initialize hud and other player details, shared with PostLogin
GenericPlayerInitialization(C);

[quasi tide]

The plot thickens I guess

[fathom aspen]

I mean the comment here says it all. They want valid HUD at all times, which proves our point that it must always be valid xD

[quasi tide]

But in what situation could it not be valid 😭

[queen flower]

except in my case lol

[quasi tide]

A question for Zlo or Jambax I guess

[fathom aspen]

Guess we'll have to ask uncle Tim

[queen flower]

So Ive moved to creating the main menu (and chat) within the controller and finally have the text appearing at least on the screen of the player that typed it.

referencing the mainmenu widget instead of the hud.

[fathom aspen]

I'm pretty sure James will go insane if it seems to be another UE non-sense no one has noticed before lol

[queen flower]

Its not unusual for it to be me that exposes this stuff lol

[quasi tide]

The only reason it stuck out to me was because I've been interested in seeing the start up process 😅

So I just got curious about when HUD actually does get created.

[fathom aspen]

You made us find some time bomb

[quasi tide]

Or wizard and I just don't know something that Jambax and Zlo will be able to clarify

[fathom aspen]

Yeah good question really. That shows how fragile my blog post is

[queen flower]

Just to clarify, I should be creating the chat for all local players/clients, and not on the server only correct?

ah.. widgets dont replicate..

[quasi tide]

Nah - client only

[fervent yacht]

That kind of makes sense as it'd seem they're likely to be local specific

It does seem you could have replicated data set up updates for each client though.

[queen flower]

Just to cover all obvious bases, a controller is spawned for 2 players if I set the number of players to 2 correct? I dont need to manually tell something else to create a 2nd controller, for player 2, for example?

and playercontroller 0 is always local?

[sinful tree]

SpawnDefaultHUD() is called in PostInitializeComponents() by the PlayerController right before BeginPlay is fired.

[sinful tree]

Correct

[sinful tree]

If you're running on the client, yes, but it's better to try and avoid using that in multiplayer altogether.

[quasi tide]

Yeah, we've already identified this part. But GameMode also sets the default hud in PostLogin.

[sinful tree]

Widget can use OwningPlayer, HUD can use OwningPlayer, PlayerState you can get the owner which is the controller, Character/Pawn you can get the controller. Components usually would be attached to controller or the character or even the playerstate, and thus, you can get the owner of the component and from there cast to wherever necessary to get the right references. Anywhere else, you probably should be feeding in a reference to the specific controller.

[queen flower]

any idea as to the benefits of creating the main menu within the game instance? watching a tutorial and they did it there. Not sure why.

Game instance is also created per player just like a controller?

[sinful tree]

I think the reference / object remains, rather than recreating it again.

Game Instance is unique to each running copy of the game.

[queen flower]

ah interesting

so all players within a shared game experience... are aware of the same game instance?

[sinful tree]

So if I was playing your game, I'd have a Game Instance on my client, you'd have one on yours, and the server would have its own Game Instance as well.

[queen flower]

ah jeez

[sinful tree]

No, it's an unshared object unaccessible to anyone but the local game (can be a client or server)

GameState is the object to use if it's something that there only needs to be one of, but it can also be shared & replicated.

[queen flower]

so that could be ideal for creating a chat that carries between levels?

[sinful tree]

Store received chat messages in the game instance, rebuild the chat window from that list on load.

I'm not sure if the widgets will exist between level loads... Trying it out myself right now.

[queen flower]

Happy to poke holes in your knowledge haha

learning lots so thanks

[weak osprey]

-- sorry back to this question, does someone have a minimal viable multiplayer example where player positions are shared over the internet that's available for download or purchase?

I'm just trying to see an example with almost everything stripped out other than that

(built a multiplayer VR game like literally from scratch in JS, never wanna do that again, lol, so am looking for something a little more plug n play in unreal)

I was told here last time that lyra is too complex to start with

[queen flower]

I agree with that haha

[weak osprey]

https://docs.unrealengine.com/4.27/en-US/Resources/ContentExamples/Networking/ <-- like what the hell is this and where do I find it

[elder sable]

Is it possible to set some datas from client before reaching OnClientConnected(AOnlineBeaconClient* NewClientActor, UNetConnection* ClientConnection) ?

Or data are not replicated yet ?

[queen flower]

https://docs.unrealengine.com/5.0/en-US/content-examples-sample-project-for-unreal-engine/

[weak osprey]

helpful thank you

trying to go look at the network one now and see if it's chill

[queen flower]

good luck

I also have this one that I made a while ago. not sure atm which engine version but it was intended to be minimal, 2 players join and you see each other moving

https://drive.google.com/file/d/1ru5cYW99UHrI2Fa6PmrekxJpklfX1sE_/view?usp=sharing

[weak osprey]

do you know if it works with 5? and-- over the internet not a lan?

[queen flower]

Should be over the internet. I did build and play it with friends from other homes/pcs.

you can rebuild for ue5 but I expect it to break...... would be really interested in the results.

I also have a huge splash screen of text on the default level that explains things ive come to understand about multiplayer that might have useful info there

[sinful tree]

So yeah, widgets and their data can persist through GameInstance.

[queen flower]

thats super awesome

[elder sable]

Any ideas ?

[sinful tree]

Just be careful with references.... Things may need to be rebound on load as the old references would be gone after a level transition.

[queen flower]

tbh I am still having trouble with getting text to appear on the clients lol but this is good intel for future steps. I dont NEED to create the widget on the game instance just good to be aware of the benefits. so What is the different between game instance and game state? You mentioned the gamestate earlier. "Submit Chat message > Get Player Controller > Run RPC to Server on PlayerController > Server Gets Game State > Server Runs Multicast with the message > Multicast updates UI somehow of incoming message."

[sinful tree]

Game Instance isn't shown here, but it's unique and only accessible like the HUD and Widgets - only on the local copy of the game running, including on the server so no replication is available directly in it since it's only locally accessible.
Only one shared Game State exists in multiplayer that everyone can access VIA GetGameState.

Game Instance in this sense is like the application itself -> It's something that is running only on your computer, and it can store variables and objects (but not spawned actors) that are retained between levels.

GameState is a place to share information that may be common to everything and needs to be accessible to everyone but doesn't need to persist outside of the session of the game. So things like, Team Scores. Using GameState for messages makes sense to use as it's something that exists everywhere, it replicates, it has no issues with relevancy, and is easily accessible when local, so again, make an event dispatcher in your GameState that passes a message, and within your UI you just need to bind to that event dispatcher and then execute whatever you need to when that message comes through.

[graceful flame]

I'm using Owner No See on a replicated projectile and I have it spawning particles when destroyed. The problem is that the particle effect is showing twice for the owner because I'm also spawning an owner only projectile with its particles set to spawn when the projectile is destroyed as well to reduce the feeling of input lag. How can I hide the extra particle effects from the replicated projectile for the owner?

Player A shoots weapon. Projectile 1 (owner only, deals no damage) is immediately spawned. Projectile 2 (server RPC) spawns a similar looking projectile that deals damage and has Owner No See.

Player B sees the replicated projectile and particles when destroyed, but Player A (the shooter) sees the particle effects from projectile 1 (fake) and projectile 2 (real).

[hollow eagle]

Lots of ways to deal with it, but the simplest is to just check if owner no see is enabled and whether the local client is the owner. If so, don't spawn the particles.

[graceful flame]

I can check for owner no see, but not sure about the other one as I'm working within a projectile BP.

Local client is the owner?

[sinful tree]

You normally can set the owner of something when spawning it.

[twin juniper]

how are the initial properties of an instanced object treated when the object is constructed treated? are the changed properties from the base object sent?
i.e. Instanced object that has an actual representative class i.e. like data asset but in raw UObject - 2 floats in instanced property no properties are changed, nothing is sent, but if a float was changed, that would be sent? And essentially all properties that are changed in instance that replicate will essentially be sent? / Basically all properties that are not the same as the parent it is instanced from = sent?

[graceful flame]

This is the Event Destroyed for the projectile.

Do I just have to make it so the fake projectile doesn't spawn particles when its destroyed?

and just live with the network lagged particle effects for the owner

[tranquil yoke]

LogNetPartialBunch> OutgoingBunches.Num (275) exceeds reliable threashold (4) but this would overflow the reliable buffer! Consider sending less stuff. Channel: [UActorChannel] Actor: BP_GameState_Main_C /Game/Maps/WorldLevel.WorldLevel:PersistentLevel.BP_GameState_Main_C_2147482559, Role: 3, RemoteRole: 1 [UChannel] ChIndex: 11, Closing: 0 [UNetConnection] RemoteAddr: 73.15.97.140:50483, Name: IpConnection_2147432400, Driver: GameNetDriver IpNetDriver_2147482563, IsServer: YES, PC: BP_PlayerController_Main_C_2147432396, Owner: BP_PlayerController_Main_C_2147432396, UniqueId: INVALID

This has started happening recently, I checked the GameState, and i was not able to find any reliable RPC calls, only RepNotfied strings, which has 980b data.

and also i have recently added logic for Attachment of childActor with parentActor, using RepNotifies,
i have shared a Picture of repNotified parameter.

so My question is , does having lots of RepNotified parameters active can cause this overFlow,
What do you propose should be the solution for this kind of problem ?

[void nest]

Hello. I have a question. On this video: https://www.youtube.com/watch?v=a_222b8K2Go&t=397s there is a comment saying "Use **smoothsync **for replication". However I can not find this setting anywhere and when I look it up online it doesn't seem to exist even. What is this person talking about? Is he just trolling or does this feature really exist? https://gyazo.com/9cfef286b29be4d3f07f38b90b33c29f

[bitter oriole]

It's a plugin

[void nest]

Ooooh ok, nvm then

[chrome bay]

Ah you know, I was looking for that. I had a feeling that would be silly. Means you can't pull info from it Client-side anyway then.

[sinful tree]

Property data is always reliable, so yes, if you have a lot of properties that are changing frequently on the gamestate that could be causing this message to show up for you.

[tranquil yoke]

This happens when someone new joins server, and i think as there lots of property which needs to be replicated to this new user, and because of this user will require a huge update, thats this user gets this issue.

i probably have to spend some time, to reduce number of properties.
I have another question :- lets say there is an array which is replicated, so if the size of this array is huge, it can cause the same issue right ?

[fathom aspen]

Yeah I was amazed to discover this a couple of days ago. Wondering about the reason for this? Maybe GameViewportClient persists, so that's why they do?🤔

Haven't got to go deep into that just yet, but I would wager that's the case

[dim trail]

What’s the difference between the replicated tag an an RPC?

[wet sigil]

So, basic multiplayer for like a gamejam, is it possible to use the steam online subsystem? Or does one have to pay they 100$ fee to ship a game for it to work? Or does Ue5 have some new multiplayer system? I'd assume I need to open up some ports and host the server from my machine

[split siren]

You can host the server directly if you have public static IP and have clients connect to your IP without the steam integration.

Yes, uint8 is the smallest amount of data you can send (as far as I know)

[solar stirrup]

There's a good chance that it gets packed with other data, not sure though

[split siren]

Any idea how to get the time between Client Move timestamp and Server time in UCharacterMovementComponent::ServerMove_PerformMovement ?
Basically I want roll back a platform to when client performed a move, so I need to get the time to rollback by.

In most cases it would be close to the ping time (expect when the moves are combined)

[left flicker]

I started following this tutorial, not expecting too much out of it. All I need is the simple hosting and joining functionality in mobile. But my aim is to have it work over wi-fi, not just LAN. And I need it to work with a computer hosting and a phone joining. The computer is going to be a player, but as the host it's going to fulfil a specific role.
I have it packaged and running on mobile and packaged and running on windows, but whenever I attempt to connect the two via LAN as directed in the tutorial, it fails to join (in either direction, ie: computer hosting/phone joining, or the other way around). Can someone help me figure this out and get it working? Insert Leia holographic recording pleading for help here
Link to the tutorial series here (specifically, episode 2): https://www.youtube.com/watch?v=6paDdKcSod4&list=PLmUaAZisS932QZWIkNvwI_abxs8yhGKmy&index=2

To be clear, I am only following this tutorial specifically, because I've been trying to figure this out for so long and it's driving me crazy lol

Correction on one point, out of about 100 attempts to connect (approx. 50 - computer host/phone join, and 50 - phone host/computer join) I managed to connect successfully once with the phone hosting/computer joining.

I am also trying to figure out hosting with a dedicated server setup (on a computer), but I can't figure out how to connect from a different device there either.

[split siren]

Problems with joining could have many causes.

1. Windows firewall - ensure Windows is not preventing connection on that port
2. Ensure Phone and PC is on the same network (if you are on data, you would have to go through internet and have public IP and port forwarding etc)
3. Misconfigured code ( are you sure you are joining on the right IP and port?)

Things to try -

1. Ensure you Phone can see your PC on the network. (Ping should do the trick)
2. Ensure the port is opened

[plush wave]

When should I use FUniqueNetId vs FUniqueNetIdRepl

[solar stirrup]

FUniqueNetIdRepl is just a wrapper (that also happens to be blueprint compatible) for FUniqueNetId

Use FUniqueNetId when you can I suppose

[plush wave]

Interesting

[granite wind]

How to communicate with ue dedicated server from outside?
For example lets say i have a boss event that needs to be triggered. The time when boss event needs to be happening is decided outside the unreal environment. Now how do I tell the server to trigger the event.

[bitter oriole]

You would have a master server that you control using say, PHP and dedicated servers would poll it periodically with HTTP requests

[granite wind]

Is that the only way? I want to know if there are any other options available. Just like how client can call server rpc's cant we call it from external programs?

[bitter oriole]

It's a very easy way

Free Web hosting, a few lines of PHP, the Unreal side is like 10 lines

[devout granite]

I am incredibly confused why something is not working in the way I think it should.

• this is in the player controller
• if the client sends the request then update logs "hello" from server AND client
• if server sends the request, then only the the server is logging "hello"

shouldn't multicast always run on all clients and servers when called from the server ? as described here https://docs.unrealengine.com/5.0/en-US/rpcs-in-unreal-engine/

[split siren]

Can you describe your setup? I assume by "server" you mean a listen-server player right?

[latent heart]

Is it a listen server or a dedicated one?

[split siren]

If it's a player it would make sense it would just execute it once, because the client does not have the "server" player controller

[devout granite]

it is a listen-server player yes

[latent heart]

What pavkon said

[split siren]

Multicast executes the command on each client that has the actor, But you don't share the "server" players controller with the client

[latent heart]

If you want a player-owned thing like that to run on all clients, use the PlayerState, not PlayerController

Or GameState for Server->Client Multicast RPCs is generally a good idea.

[split siren]

PCs are shared only to the owning clients

[devout granite]

thank you very much!

[dim trail]

Difference between replicated tag and using rpc

[devout granite]

Just one more small question :D
client widget button click -> send "button clicked event" to player state -> update all players to know that a button has been clicked in the same widget

What is in your opinion the best way to pass the "button clicked event" back to all widget ?

[split siren]

You could wrap the replicated functionality in an Actor, but doing through another object is fine. I would personally put it into PC, as PS is usually considered a one way street, at least in my experience

[devout granite]

thank you @split siren :D

[latent heart]

Replicated tag is the Epic way of doing it more efficiently than you can. A manual RPC is a way to circumvent that if you need things sent every tick or only in certain situations or on events, etc. Also RPCs work from client to server, where Replication does not.

[elder sable]

Can i make un serverTravel from a beacon connection ?

[twin juniper]

hi there

[split siren]

Well hello there

[twin juniper]

is there anyway in BP to get port number ??

I am working on multiplayer project and i want to get the port number
cause I am running multiple dedicated server (session) on the same AWS server

[solar stirrup]

yes

[pearl fog]

hey! what could cause all references to an rep actor client-side to not be properly set? (stored inside an array of FastArrayItem but I tested outside)
the actor is properly replicated though

[quasi tide]

@chrome bay @fathom aspen and I ran into something last night but we couldn't figure out why something was the way it was. It seems like both the GameMode & PC create a client side HUD. Can you think of a situation in which that is necessary? (PC happening in PostInitializeComponents and GameMode happening as the very first step in PostLogin)

[chrome bay]

Hmm I've only seen PC create a HUD

GameMode tells PC to create it though

[quasi tide]

From what we could tell after our digging, they both end up creating the HUD.

[split siren]

@chrome bay I have been randomly finding your answers on Answerhub while Googling issues and wanted to just thanks for posting those over the years

[quasi tide]

Destroying the previously created one in the process.

GameMode calls ClientSetHUD and PC calls SpawnDefaultHUD

[chrome bay]

That's not what my version has

[quasi tide]

🤔

[chrome bay]

{
    if ( MyHUD != NULL )
    {

        MyHUD->Destroy();
        MyHUD = NULL;
    }

    FActorSpawnParameters SpawnInfo;
    SpawnInfo.Owner = this;
    SpawnInfo.Instigator = GetInstigator();
    SpawnInfo.ObjectFlags |= RF_Transient;    // We never want to save HUDs into a map

    MyHUD = GetWorld()->SpawnActor<AHUD>(NewHUDClass, SpawnInfo );
}```

That's it

In 5.0.3

[quasi tide]

Yeah, that's the implementation.

I'm talking about where ClientSetHUD actually gets called

Which is in the GameMode's PostLogin function. First call is to GenericPlayerInitialization

Inside there, it checks if the PC is a client and will call ClientSetHUD

Which would run this

But also in PostInitializeComponents for the PC, it will call SpawnDefaultHUD

[chrome bay]

Oh I see. Look like that just spawns an "empty" HUD class

Why I have no idea

Might be a legacy thing?

[fathom aspen]

GenericPlayerInitialization is the function that does that. Either in PostLogin or HandleSeamlessTravelPlayer

[quasi tide]

So which one is the real HUD 🤔

[fathom aspen]

So it's done for both hard and seamless travels

[chrome bay]

The one from ClientSetHUD

[quasi tide]

So GameMode's call

[chrome bay]

The one created during PostInitComps is just the base AHUD class, and that gets destroyed when ClientSetHUD is received

Presumably they initialize it there to some value just so GetHUD returns something, but that does seem dumb tbh

I can only assume it's legacy code

And a lot of the old legacy code is dumb

Epic sadly didn't seem to care about tidying it all up for 5.0

[fathom aspen]

Yeah both points in time are called before any BeginPlay, so I'm not sure why they need that early dumb HUD

[quasi tide]

Maybe just to be safe? Even if it's the base AHUD class, there is still guaranteed to be a HUD.

[fathom aspen]

OverrideWith laughing around the corner

[fathom aspen]

Yeah probably some edge case they ran into while making UT

[stray thunder]

my "set input mode game only" (only runs on client) is inside a multicast. do i have to run it inside run on owning client to get the proper PC? It doesn't like any of the PCs I've given it.

[pearl fog]

yeah it seems that actor references inside a fast array item ustruct aren't updated 🤔 but I'm pretty sure on another project it worked just fine wtf

[elder sable]

How could i get more informations to know why my game net driver is not created ? my beacon net driver is working and it's the same configuration in the engine ini so i'm out of ideas

[fathom aspen]

It's a cosmetic event, meaning it doesn't run on dedicated servers. So you run it IsLocallyControlled, or IsLocalController

[shell forum]

Anyone have their DefaultGame.ini and DefaultEngine.ini settings they used for voice chat in a released game? The default ones cause stuttering and saturation but changing them causes it to crash.

[stray thunder]

anyone have one of these made already or know where one is?
I'm having a really hard time keeping my stuff organized in my brain and its showing in my project.

[kindred widget]

Input mode is entirely client side. Server should NEVER dictate this directly. At most server should send client a state that it expects the client to be in. Then client can set itself up for that. In fact this gets even easier with CommonUI stuff. Activatable widgets can toggle this state very easily with a single C++ override.

[quick sparrow]

what is that diagram? is it a website to help people keep track of their projects?

I need to know

[elder sable]

Is it possible to use beacons in PIE ?

[stray thunder]

its called https://www.milanote.com/refer/rcDLRFJ5KEIRkb7zcG

[valid imp]

In split screen multiplayer, is there one "client" per player? Or is data shared?

[fathom aspen]

Isn't it called on server in case of a listen-server?

As the local controller is on server, so input is handled there too

[kindred widget]

It is, but it should never be considered. This code should be network agnostic. It should act the same as a client to a dedicated, standalone, and as a listenserver.

[fathom aspen]

I know, that's why I said it only runs on the local controller

Nice, thanks for the confirmation

[sinful tree]

Each player in split screen would have its own player controller.

[kindred widget]

@fathom aspenIf you want some nice input handling change. You should check out CommonUI. They have a concept of ActivatableWidgets. Basically the leaf-most activated widget determines the current control input. I'm using this right now. My first person game has a MainGameDisplay widget that is set as GameOnly basically. My other widgets are defaulted to Menu which is basically UIOnly. So when I push my inventory screen to be the leafmost activated widget, it automatically changes from game only input to ui only input. It is soooo much cleaner to use than constantly tracking that state yourself.

Could very easily use this in multiplayer by making the server tell client it needs to be in some state and client responds by simply adding a widget to screen. Boom, new control mode.

[fathom aspen]

Wow, thanks for the suggestion. I tried playing around with that plugin after UE5 came to the scene, using the ContextExamples project, and I must admit that is awesome. I should give it a try once again, really thanks for the insights!

So if I get it right, widgets are like nodes, right? When you add a widget to the screen it gets added as a son node to the current node, aka, the widget active right now?

[kindred widget]

I'm not a fan of some of the widgets. I'm still using a lot of my own personal widgets for a lot of things. Text, etc. But I am using their CommonButtonBase, and ActivatableWidgets which is most of the framework.

[fathom aspen]

And that current widget becomes inactive?

Yeah the two you mentioned may be the best of them all. I like the idea that you can have a centralized style for all of your widgets of the same type

[kindred widget]

Uh.. Sort of. You can put activatable widgets anywhere. So far I've personally found it best to have a single UUserWidget added to screen that contains stuff like the WidgetStack or a Switcher. For example, this widget here is AddToViewport at HUD's PostInitComponents. It's not an activatable widget, just a base UUserWidget that contains the CommonActivatableWidgetStack

This gets called in it's construct that adds my base gameplay widget. This is the one that overrides in a C++ class to set the control mode as Game

Note when you push a widget to the stack, it's activated then. So then when I say.. open an inventory. All I do is this.

Push a new widget class to the stack, It creates it if it wasn't already, adds and activates it and stops drawing the one below it.

If you wanted overlaid widgets, you could easily add multiple stacks etc.

Because inventory doesn't override that input config it defaults to Menu. So when I press "I", that inventory adds, activates, and I immediately get a shown mouse cursor and no more PlayerController/Pawn/Gameplay input.

[chrome bay]

Urgh Discord give us Bookmarks already

[fathom aspen]

Amazing summary Authaer! I should check them like real soon ❤️

[kindred widget]

Also. Save this somewhere. Sanity saver.
CommonUI.DumpActivatableTree 0 1 0 0

Writes the currently activated tree to the output log. You can use it without the arguments for the full tree but using them makes it much cleaner.

I just realized I could make opening widgets an ability in GAS. Which could automatically be blocked by tags. 😮 Goodbye winding HUD framework.

Or add tags for animation states. They weren't kidding, you can use GAS for everything.

[kindred widget]

Nice! Now cannot access inventory or building screens if player has stunned, or uncontrollable tags. 😄 And they still show up and work perfectly.

[nimble pike]

What is the difference between these two methods?

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

    //METHOD ONE
    FDoRepLifetimeParams SharedParams;
    SharedParams.bIsPushBased = true;

    SharedParams.Condition = COND_None;
    DOREPLIFETIME_WITH_PARAMS_FAST(AVILECharacterBase, PawnData, SharedParams);

    //METHOD TWO
    DOREPLIFETIME(AVILECharacterBase, PawnData);
}

Or are they just a different way to writing the same thing?

[fossil spoke]

You mean DOREPLIFETIME_WITH_PARAMS_FAST and DOREPLIFETIME? @nimble pike

The first is for usage with PushModel, the other is for normal replication.

[nimble pike]

Yup, that's the only difference? I was wondering because I could still use the first and set SharedParams.bIsPushBased = false;

[fossil spoke]

It most likely works inplace as a regular declaration for replication as well.

But is meant for PushModel, as I believe it is in the PushModel Header anyway.

Could be wrong there though

[nimble pike]

I see, thank you

[latent nest]

I’m making a online fps, using steam advanced sessions. Is there a way I can get a server so that can host the game over a player. Thanks

[shell forum]

So let's say I only want an object in the world to exist on the server at start? Is that what "net load on client" is for? Would setting that to false not load it at all?

[graceful mango]

How do i send RPC only to clients i want?

For example: i dont want to send fog of war data of some team to another team - it will lead to hacks

[fathom aspen]

Why this is yiddish to me?

[fathom aspen]

What class this is in? Seems like you are modifying the engine

[past totem]

dedicated server
UNetConnection::Tick: Connection TIMED OUT. Closing connection.. Elapsed: 60.12, Real: 60.01, Good: 60.01, DriverTime: 1756.75, Threshold: 60.00, [UNetConnection]
how do I make this Connection Timeout Threshold higher?

I already put this in my [PROJECT]/Config/DefaultEngine.ini but it doesn't work, still says timeout time is 60

if I try to load in like a few times then it will work randomly so I'm sure it doesn't work cuz the timeout time (big map), so I just need to figure out how to increase the timeout time thing

[fossil spoke]

Call the RPC on their PlayerController?

Only Clients and the Server have PlayerControllers.

[rotund onyx]

how can I call a Server event in an actor the player does not control?

[quasi tide]

You don't. You can only call server events from actors you own

[fossil spoke]

You can only call RPCs on Actors that have a NetOwningConnection.

[rotund onyx]

how do I get around it then?

I can think of lots of cases where that has to happen, so how do people normally get around it?

[fossil spoke]

Use a proxy, like the PlayerController?

[quasi tide]

RPC to the server what you're trying to do. So on your PlayerController or the possessed pawn, do a server rpc doing w/e it is that you want to do.

[rotund onyx]

I am trying to, but it doesn't work for clients

[quasi tide]

Show code.

[rotund onyx]

oh never mind I think I found it

I assume hit result under cursor does not work on server side

I had fixed it for some other stuff but must have forgotten in this case

[latent nest]

I’m making a online fps, using steam advanced sessions. Is there a way I can get a server so that can host the game over a player. Thanks

[dark edge]

Input is local only.

[dark edge]

What is "host the game over a player"? You mean listen server?

[latent nest]

Yes. Should I use a dedicated server once I publish the game

[sinful tree]

Listen Server: A player's instance of the game acts as the server, while also allowing them to play. If the player hosting leaves, everyone is booted.
Dedicated Server: A standalone instance of the game that acts as the server that has no player, so it's only acting as a means for players to connect. If all players leave, the server can still be running.

Depending on the type of game, you may not want players running their own servers, whether listen or dedicated, in which case, you would have to use dedicated servers that are hosted on your own computers / server hardware.

[dark edge]

IDK, it's your game. Does the design call for dedicated or listen?

[crystal crag]

What you said makes little to no sense

Oh I should have read the rest of the channel

Your question makes me think you need to try a much smaller game first

[left flicker]

I'm looking into Flopperam's Amazon GameLift tutorial series, I was directed to it a few times. I'm just wondering if anyone has gone through it and had success with it?
I found a comment on the first video that says, that the gameliftSDK only supports up to 4.25 or something and I'm using 4.27. Does anyone know if that is going to be a problem or if that is true or anything? The comment is a year old.
Also I found that there are two GameLift Plugins in the UE Marketplace, are those worth it for whatever reason? I haven't looked too much into them yet.

[plush wave]

Guess I should be using FUniqueNetIdWrapper the most?

[split siren]

I am working with AWS Gamelift on my latest project, and I can confirm that the SDK works. I started with 5.0.2 but due to the many bugs I reverted to 4.27 without any issues with the SDK. I have not watched the full tutorial from Flopperam, as I built my own solution using slightly different products from AWS.
I don't think plugins are necessary, because you will need to make your AWS backend anyways, based on your specific needs/game. Basically the only communication between Gamelift and AWS is handled via the SDK, the rest needs to be custom, as you don't want your users to directly talk to Gamelift and start instances.
You need to have a layer in between with your policies that limit who can start instance, who can join, who is admin etc.
Next part is to figure out how to communicate between AWS and dedicated server outside Gamelift SDK. For example user tries to join, but he has been banned/blacklisted. How/when do you check against some database of banned users? Preferably before even contacting the game server.
Damn, this was a longer writeup, anyways GL, it will hopefully be a fun journey for you.

(And be careful with Gamelift, the cost can really add up quickly)

[left flicker]

😑 Already hit a wall setting up in the second video lol. I'm trying to figure it out now. I think it might have to do with having VS2019 and 2022. But I'm looking forward to getting past this and making some real progress.
Thanks so much for the info! Backend stuff is intimidating for me, so I'm really hopeful I can get this to work without too many hiccups

[split siren]

From my experience, there will be plenty if hiccups along the way, just be resilient and you will get there. I would highly recommend starting with an easy example from AWS Gamelift before doing what Flopperam did and integrating lambdas and cognito etc.. https://www.youtube.com/watch?v=Sl_i6YIgQqg
The tutorial has about an hour compared to 20+ hours of Flopperams tutorial

Also, contact AWS support right away to get your Gamelift limits raised right away, so you start waiting the week+ for their reply

[split siren]

Can I ask what is your monthly AWS budget? Just out of curiosity

[left flicker]

Right now I'm still working on getting the basics of it set up. (about 10 minutes in to Part 2). I'm running: msbuild ALL_BUILD.vcxproj /p:Configuration=Release
But still no luck. I'm going to start following the video you sent and see how that goes. I have an idea of the problem.

Right now, I don't have an AWS monthly budget set. After I can get the basic functionality of it working in some way and it looks like it will work for my project, I'll need to discuss budget with some people and figure that out

[plush wave]

Ok so how do I create a list of current players?

I can't really use an array of FUniqueNetId pointers

What's the proper way to do this?

[split siren]

You can just get the all Player Controllers on the server

[plush wave]

But I need to somehow save player id's to a list

FUniqueNetId seems to be this

But it's opaque

It's not clear if I should be using a pointer, or a ref

[chrome bay]

TSharedRef<const FUniqueNetID> usually

[plush wave]

Ok so FUniqueNetIdRef then?

Thank you

[chrome bay]

That's just a typedef to the same thing, but yeah.

[plush wave]

What is the purpose of FUniqueNetIdRepl then? Sorry, it is slightly confusing to me.

[chrome bay]

To expose it to Blueprint and replicate it

[plush wave]

Hmm so internally I should use the ref. But when I need access to the ID in BP I need to wrap it in a FUniqueNetIdRepl?

[chrome bay]

yeah

but rarely do you really need it in BP tbh

[plush wave]

Right

Dumb question but why not just make FUniqueNetId exposed to BP

[chrome bay]

They can't because it's an abstract type

Every subsystem creates it's own concrete implementation of it, e.g. FUniqueNetIdSteam etc.

That's why they are exposed as pointers

FUniqueNetIdRepl just copies the raw byte data

[plush wave]

Right

I was using the Steam OSS - and just going straight to the transparent type

Now I'm using EOSPlus with Steam

Which is why I'm trying to understand the opaque type better

Thanks for the info

Wonder what FOnlineAccountIdHandle. Maybe new to UE5?

[plush wave]

So because FUniqueNetIdRef is a ref it obviously can't be null

So if it exists within a struct I've made

I'll have to pass the FUniqueNetIdRef in the constructor, right?

Actually, looks like I can't do that

Error: 'FUniqueNetId': cannot instantiate abstract class

struct FMyStruct 
{
  FUniqueNetIdRef SomeID;

  FMyStruct(FUniqueNetIdRef Param) 
  {
    SomeID = Param;
  }
}

Figured at least passing it in would work... since it would have to be init elsewhere anyways

[latent heart]

Have you got 2 different versions of the blueprint?

and/or c++

It's an RPC. You could be getting cross-install issues

If it's a PIE issue, then obviously not!

[humble edge]

I am using UE5 for Multiplayer. Dedicated server is working pc connects to it but android build doesn't. Any help how i could connect it to android. My build actually notify server and log updates but android don't go inside game level
And dedicated server have weird bug my backup old version project file server works properly but later updated project file dedicated server build stucks after bringing level took ... something like this and never shows engine initialization at the end. I tested working version of server in android .. PC build connects properly and shows join succeeded but android have problem connecting

[plush wave]

Where do you get avatars from the Online Subsystem?

Thought it would of been in FOnlineUser

[bitter oriole]

No built in way

Check advanced sessions that does it

[lime echo]

When an actor is replicated for a client for the first time (spawned), what will be called first? Its BeginPlay, or OnRep for actors who have it as a replicated property?

[winged badger]

OnReps, PostNetInit, then BeginPlay

[lime echo]

Thank you!

[winged badger]

and it will have all replicated values that were set in the Tick the Actor was spawned on server

even if they were set after BeginPlay server side

[lime echo]

Yes, except for actors, which may have not spawned yet.

[winged badger]

it might have more, the NetBroadcastTick goes after the main Tick

and there is no guarantee Actor will be sent in the same Tick it was spawned

but you can spawn it, set some variables right after, and client is 100% going to have those values before Actor's BeginPlay on its side

as they are sent in the same packet as the instructions to spawn the Actor

[lime echo]

Thanks! But I cannot relay on actors replicated properties to be valid on BeginPlay, right? As there is no guarantee for order of spawning.

[winged badger]

you can as long as they are not pointers to other replicated objects

unless those objects are the subobjects of the actor in question

if Actor A has replicated pointer to replicated Actor B

there is no guarantee B has replicated yet

so valid NetGUID, but still an invalid pointer

[lime echo]

Yes, that's what I meant. Thank you very much for your help!

[sharp hound]

Hi everyone. I have a multiplayer setup. when the player logs in, after the post login in the game mode, I change some attributes of the player mesh (blendshapes, textures) using some variables that I passed from the lobby to server pawn using the game instance. The first player looks fine, when the second player logs in, the first player sees the correct attributes of the second player, but the second player sees the default attributes of the first player, not the correct ones.

The attributes are stored in the pawn as replicated. Can anyone help?

Thanks

[winged badger]

game instance is local to each player, and is not a good place to stash lobby data

generally, using seamless travel to transfer players from lobby to game, holding the attributes in PlayerState, and using CopyProperties in PS to copy them over to new instance

is considered the best approach here

this will also cause for Login not to be called on GameMap

and the logic from there should move to HandleStartingNewPlayer

[solar stirrup]

Use FUniqueNetIdRepl

or ptr

[left flicker]

☠️

[sharp hound]

@winged badger: Thank you very much

I'll try

[twin juniper]

Do I have to do something special to get an replicated array to update on the client? When I add the item to the array in blueprints it replicates but not in C++.
In my code on the server I do Array[Elem] = Item; No update on client
In bp I just do set array elem, and it gets updated on client..?

[harsh wigeon]

i see this, if i close my client

[2022.08.03-15.06.33:417][670]LogNet: UNetConnection::Cleanup: Closing open connection. [UNetConnection] RemoteAddr: 127.0.0.1:57006, Name: IpConnection_2147482458, Driver: GameNetDriver IpNetDriver_2147482499, IsServer: YES, PC: BP_PlayerController_C_2147482454, Owner: BP_PlayerController_C_2147482454, UniqueId: NULL:DESKTOP-7TOEQQL-6B61C3084967693DA6A6CB924E7C9ED7
[2022.08.03-15.06.33:418][670]LogNet: UNetConnection::Close: [UNetConnection] RemoteAddr: 127.0.0.1:57006, Name: IpConnection_2147482458, Driver: GameNetDriver IpNetDriver_2147482499, IsServer: YES, PC: BP_PlayerController_C_2147482454, Owner: BP_PlayerController_C_2147482454, UniqueId: NULL:DESKTOP-7TOEQQL-6B61C3084967693DA6A6CB924E7C9ED7, Channels: 24, Time: 2022.08.03-15.06.33
[2022.08.03-15.06.33:418][670]LogNet: UNetConnection::Close: CloseReason:
[2022.08.03-15.06.33:418][670]LogNet:  - Result=Cleanup, ErrorContext="Cleanup"
[2022.08.03-15.06.33:419][670]LogNet: UChannel::Close: Sending CloseBunch. ChIndex == 0. Name: [UChannel] ChIndex: 0, Closing: 0 [UNetConnection] RemoteAddr: 127.0.0.1:57006, Name: IpConnection_2147482458, Driver: GameNetDriver IpNetDriver_2147482499, IsServer: YES, PC: BP_PlayerController_C_2147482454, Owner: BP_PlayerController_C_2147482454, UniqueId: NULL:DESKTOP-7TOEQQL-6B61C3084967693DA6A6CB924E7C9ED7
[2022.08.03-15.06.33:426][670]LogOnlineSession: Warning: OSS: No game present to leave for session (GameSession)

can i bind somewhere to be notified about this in game to tidy up ?

[twin juniper]

seems to be related to trying to use OnRep

[quasi tide]

C++ onrep doesn't fire automatically. You must call it yourself.

[twin juniper]

How am I suppose to call it for the clients? I thought it did on the clients but not the server.

and what I mean is the value wont replicate to client when I mark the property as OnRep

Another weird thing is I am also using UObjects and when I also add them to the array using bp, it replicates the object and all children objects without adding them to the subobject list, but if I add it to the array in C++ I have to add it to the subobject list for it to replicate (in this case it is working when marked simply as Replicated, no onrep)

[sinful tree]

OnLogout() in GameMode? It gives you a reference to the controller that's exiting the game as well.

[harsh wigeon]

thank you

already trying exactly that right now

[past totem]

dedicated server
UNetConnection::Tick: Connection TIMED OUT. Closing connection.. Elapsed: 60.12, Real: 60.01, Good: 60.01, DriverTime: 1756.75, Threshold: 60.00, [UNetConnection]
how do I make this Connection Timeout Threshold higher?

if I try to load in like a few times then it will work randomly so I'm sure it doesn't work cuz the timeout time (big map), so I just need to figure out how to increase the timeout time thing

[past totem]

I figured it out from searching the server history:
[/Script/OnlineSubsystemUtils.IpNetDriver]
InitialConnectTimeout=120.0
ConnectionTimeout=20.0

in DefaultEngine.ini

[past totem]

why is it after I login this gets constantly spammed in my server log and the whole server is like not responding when I try to do actions in game with my logged in client?

[woeful pebble]

If we did p2p multiplayer, must we port forward?

Using advanced sessions without a subsystem

[solar stirrup]

No need for port forwarding if you're using P2P

[woeful pebble]

My friends and i can't connect

and we are in two different countries

He can't find my server

[coral wing]

Is there a way to make custom launch parameters for my packaged dedicated server? Like launch a specific map, password, etc.

Like a variable that's changed by a launch parameter.

[graceful flame]

You can't use steam app id 480 to test in different countries. Have to be same.

or you can apply for your own app id

[pliant moss]

Do i have to take server / client logic into account when working with AI controllers? they are owned by the server. so i guess logic for BT and tasks etc will run on the server. I mean, is there something that i should keep in mind when working with AI controllers for a multiplayer game?

[graceful flame]

That sounds right AI tasks are server only in a multiplayer game.

[graceful flame]

@left flicker @split siren Regarding your discussion about AWS GameLift SDK there's also this official learning resource about containerization which uses Google Cloud for its demonstration but you could also swap it out for AWS. https://learn.unrealengine.com/course/3773792?r=False&ts=637951373021250593

[twin juniper]

Hello, I am creating a backend server for a game with features similar to Call of Duty Multiplayer mode (Scoreboard, loadouts, ranks etc.). I could not calculate what kind of average load I should be prepared for this server, which will be independent of the game server. For my game servers, this calculation was relatively easy. How many requests per second do I receive for an average of 3000 active players, does anyone have experience?

[distant echo]

can anyone help me test the functionality of my game

[graceful flame]

I think you have to get a list of all the backend server interactions then estimate the average number of times a single client could trigger them plus the number of predictable backend server interactions coming from the game server (ex: post match results at end of round).

Also multiply by the number of clients in a session.

[stone niche]

Hi, Since moving our project to UE5, running a dev or staging build on Steam, when we map change, the connection to the dedicated server times out.
In the server log it references Cookies, but when reviewing the old server logs from UE4 builds, Cookies are not mentioned.
I have not been able to find any project settings that reference Cookies.
The problem shows here in the log;

LogHandshake: SendConnectChallenge. Timestamp: 80.590992, Cookie: 097209119106218040002113224116027049149059155195076043109020
LogNet: NotifyAcceptingConnection accepted from: 76561199008011731:7777
LogHandshake: SendChallengeAck. InCookie: 109047092251092150235216063150187149154036038173047122241031
LogNet: Finding connection to update to new address: 76561199008011731:7777
LogNet: Failed to find an existing connection with a matching cookie. Restarted Handshake failed.

[twin juniper]

how would I condense a singular value in multiple array elements to be replicated to client as a single value?
i.e. Server sets replicated array last index to 99 with an integer of 0. It will sent 400 bytes. or server sets Array of object references last index is now 99, it will send 100 bytes despite them all being nullptr. (send things that can be combined as a single thing?) or at least telling client what to initially set the size as before sending the same thing for every index.

[willow prism]

Hi guys. In my multiplayer game I have a problem that I don't know how to deal with. When a client leaves and re-enters, he sees the other players at the starting point, when they are not there. This is solved when the other players move, I suppose it is because they update the client. Is there a way that the client that enters updates all the players without the need for them to move?

[fluid summit]

Do you have net load on client?
Try with adding on your player, on "BeginPlay" the following:
Has Authority (False) -> Set location = Current location

[willow prism]

Thanks for answer
Doing this does not return the location of the client only?

[fluid summit]

you are right, maybe do it from server RPC to owning client or just set location=location from server and wait for the rep on client

[willow prism]

ok, i try, ty

[fluid summit]

it's weird that they are not having the location okey on netload, i would check on to why that is not happening

[twin juniper]

Does anyone in here use the Voxel Plugin?

[royal forge]

i've been trying to figure out unreal networking, and right now i'm stumped by rpcs. i'm trying to send data through a replicated actor from client to server and vice versa, but the function seems to be executed on the calling machine

like, trying to call the client function on the server just runs it on the server, and calling the server function on the client just runs it on the client

here's how the functions are defined

[fossil spoke]

@royal forge Firstly, you should be using int32 over int.

Secondly, have you made sure that the Actor is set to Replicate, you can only call RPCs on Replicated Actors.

[royal forge]

yes

[fossil spoke]

Also the Actor must have whats called a NetOwningConnection to be able to utilize RPCs.

[royal forge]

oh so i didn't know about that part

[fossil spoke]

At least for a Client to send an RPC to the Server thats the case.

A Server owned Actor can call RPCs all it likes, as long as its set to Replicate.

Check the Output Log for Warnings saying something like "XXX function was not called because no NetOwningConnection"

[royal forge]

no such warning

it's just running the function locally

i did get this warning though: "Warning: OSS: No game present to join for session (GameSession)"

i don't know if that has any relation

it probably does though

[fathom aspen]

It doesn't

Are you calling the _Implementation version or the regular one?

[royal forge]

regular

[fathom aspen]

Good. Then just note about that part you didn't know about before

[acoustic drum]

I know its a strange question but how can you tell that the function is being executed locally?

[royal forge]

i'm using ue_log to log the function calls

and the log appears for the wrong function

[acoustic drum]

Surely logging function calls is going to tell you it was called on the same machine since an RPC is called from one machine and executed on another. Or do you mean that you have a log inside the function

Maybe when you call an RPC on, for example, the client then the server also "calls" that function but idk