multiplayer

[quartz smelt]

I'm not sure what's happening

[sinful tree]

You're not doing an RPC or anything asking to kill on both server and client, right?

[quartz smelt]

Nope, nothing like that

Omg wait I got it

[short arrow]

Hey so I'm working on a little replicated combat system to advance my knowledge. Anytime the player attacks an enemy I want them to automatically slide closer to the target they're attacking.

My take on this is to use a Vinterp to smoothly suck the player closer to his target, however since this is multiplayer I'd need the server to do this. I don't really want the server setting the actors location every world delta seconds unless that is the preferable method (I don't think it is). Does anyone have any ideas worth trying? I'm not sure if UE has some sort of method in place for what I'm looking for

[tepid pawn]

Hey peeps. Need to know the details for Port Forwarding. Can't find it online. Spent about 5 hours looking so far

[hollow eagle]

1. look up the manual for your router
2. find port forwarding instructions
3. ???
4. profit

[nova wasp]

don't explain this to your parents it will freak them out

[tepid pawn]

Missing number 3

I need to know what "service type" means and what I should set it too.

It has Pop3 and Http and DNS etc as choices

[hollow eagle]

the answer is custom

ie none of the above

[tepid pawn]

Oh so type the word "Custom"?

[hollow eagle]

no

I don't know what you type

or what you're looking at

that's why I said to look up the manual for your router

there is no standard here, it depends on your router.

some manufacturers put some common services in there so you don't need to know the ports yourself, but you're not using those.

you're ostensibly using some custom port

[tepid pawn]

I see So UE doesn't have a type?

[hollow eagle]

I don't know what "service type" means because again, that's something specific to your router.

The only "standardized" parts of this are port numbers and the ip address to route to.

[tepid pawn]

Yeah it seems to be the type of server

Like FTP server or Mail server

Or DNS server

I can't find what a Listen Server is anywhere

It shouldn't matter right? If it's a Pop3 mail server, the port should open and an external service should be able to connect

[sinful tree]

If you're able to set the port and that it's UDP, then it probably doesn't matter what you select for the service.

[tepid pawn]

So it's definitely UDP?

[fair lantern]

does anyone know how I can replicate an animnotify event differently amongst clients?

im trying to do this in an actor component, is this correct?

I have a feeling that im doing something wrong here, it works but i dont think it is the ideal solution

[quartz smelt]

I mean it's kinda basic, but would a move-to not work?

[tepid pawn]

Wow you got a server working? I've spent a week trying to get any server working. I'm thinking I'm maybe not supposed to make a game at all. Spent months working it all out, learning about what I needed and how everything should be set up. Done the tutorials exactly. All for naught. Can't even work out if I should Port forward TCP or UDP or both. Sending me insane.

[fair lantern]

Im not doing anything insane

just simple replication nodes

[tepid pawn]

I'm doing the manually insane bang my head against the wall job of trying to open port 7777 LOL It's easier to make an entire game than open a port LOL

[fair lantern]

u dont know how to open a port?

[tepid pawn]

Racking my brain over it. 6 hour in so far

Tried pretty much every combination

[fair lantern]

u found the settings in router?

if not then afaik its not possible if ur router doesnt support it

[tepid pawn]

Yep. It's Nat Server

[fair lantern]

firewall?

make sure firewall not blocking

[tepid pawn]

Nat Forwarding Virtual Server

I thought I did

[fair lantern]

I remember port forwarding when I was like 10 for a minecraft server, it can't be that hard

theres probably something simple ur leaving out

idk tho its been quite a while

[tepid pawn]

I just shut down all the firewalls. I'll check again

[fair lantern]

I actually don't know how to make a dedicated server for ue4 btw

im quite new myself

[tepid pawn]

Okay then. Firewall it is

Thank you

[fair lantern]

hahaha

was that it?

[tepid pawn]

Now to make an exception

Somehow

[fair lantern]

haha damn im a genius

asif that worked lol

[tepid pawn]

LOL

[fair lantern]

firewall check works like 1% of the time

haha

lucky bugger

[tepid pawn]

Yeah first person in 6 hours to lead to a break through

[fair lantern]

as I said, port forwarding isnt meant to be hard

had to be something simple

back to basics 😛

[tepid pawn]

Yeah just thought I added an exception already

I did but it was the wrong exception

Wrong UE4 editor

LOL

Well now I can get back to work! THANK YOU!!!!

[fair lantern]

kekekekek ❤️

[short arrow]

No I don't want the server to do the lightest work possible. I ended up figuring out a very good method using minimal traffic. I appreciate it though

[fringe galleon]

ReplicatedUsing runs on server or client?

[chrome bay]

Clients only. Since you can only replicated values from Server->Client

[lost dune]

Have someone the time to help me? , My Move To nodes constantly fails

my mob have to move to my player character , both mob and player character have sphere collision around them but i setted it to can't affect navigation

the navmeshbounds is correct when i press P

the move to is executed server side

but always fail

[round star]

Whats a good place to store player inventory. Listen server. What about making an actor component with the inventory struct and attach to each character or no>?

[kindred widget]

This depends on your game style and the inventory in question.

[round star]

I figured as much

[kindred widget]

Server type doesn't matter.

[round star]

Well the inventory saving doesnt matter

I mean whjiole playing ya

but if you reconnected to same host it is not persistent

I am woried to make some huge mistake while deep into it

lol

Ive done this so many times when doing something because I am naieve and dont ask enougfh for help

[kindred widget]

Generally speaking, I'd say to place it on the Playerstate if you're unsure. It has the least drawbacks. It's easily seen from all players for UI if you want a squad screen sort of thing. It can persist for a short time for disconnects.

[round star]

Hm okay

[kindred widget]

There are some arguments to put it on the character if you want deathboxes, but this only really works if you have a saved game state for d/c handling. For a persistant online style, you'd likely want it on the character. Easier deathbox creation in the end.

[slate basin]

Does anyone know if this is always true https://answers.unrealengine.com/questions/42213/is-it-possible-to-choose-order-of-call-of-replicat.html

That the variables always replicate in the order setup in GetLifetimeReplicatedProperties or can it be random if there is packet loss etc?

[kindred widget]

I generally would not trust the order. Just rely on state in your onreps. Your OnReps can be set up to check each other's state and handle the logic accordingly.

[round star]

Took me a second to realize what you meant by deathbox XD. Well there is no killing or looting of others. You can die thougfh

Appreciate your help thank you

[rocky topaz]

anyone has any advice on how to implement sprinting, sliding and wall running as efficiently as possible?

for it to be smooth in multiplayer

I know of MOVE_Custom but when using it for sprinting it broke everything (even though max speed was high)

I assume I need to rewrite more than that to make it work

[hard cipher]

For Multiplayer AI what Should I use ?
BT with BB or Just AI Blueprint?

[chrome quest]

You can use the entire package, nothing wrong with that. AI and BT with BB.

[winged badger]

multiplayer doesn't really matter when it comes to AI design

it all runs on server, controlers are not replicated, BTs don't run on clients

[misty plover]

Hey guys, I am having an issues changing my players Mesh material for clients. I am using a function that is ran through the server and calls SetMaterial() this updates the materials for the server but not the clients. Any ideas why

[meager spade]

You need to tell those clients via either multicast or rep notify property. You want the later one as its a state change.

[misty plover]

Thank you!

[sinful tree]

Not sure I follow.
When you're talking about Unreal Engine, there is only two options for types of servers: Listen Server or Dedicated Server, and Listen Server is really only for when you have a player that wants to play and their computer can act as the server for the game. There would be no point in running a Listen Server on something like AWS or Google Cloud as there would be no player on the server end, so you would always deploy a dedicated server on something like AWS, or any other hardware where there wouldn't be a player playing on that hardware.

The only thing I can think of is maybe you're thinking "dedicated" means always on which you may not necessarily want?

[rocky stag]

How can i mix two conditions for replication of my property . for example COND_Initial && COND_OwnerOnly ?

[rocky stag]

Something like this :
DOREPLIFETIME_CONDITION( AMyPlayerController, PlayerActivePerks, COND_InitialOnly && COND_OwnerOnly );

Also checked PreReplication functuon to use DOREPLIFETIME_ACTIVE_OVERRIDE but i dont know how can i mix these conditions for condition parameter

[lost inlet]

it's actually better to use push model I guess, but I don't believe you can, it's not a bitfield by the quick google result I found

plus if it was a bitfield, then you wouldn't use it like that either

[twilit radish]

Hello, what would you guys recommend as project to practice multiplayer? Something that would definitely be doable and isn’t as complicated as say an MMORPG 🙂

[native forge]

i have a question but not sure where to post it

[peak sentinel]

Practice Among Us, it helps a lot

Colors, chat system, and game state etc. very generic and easy to implement

While trying to solve the problems related with Among Us development its very likely you will ask what every developer should know about UE's replication system and this way you'll learn a lot

Like 'should I use an RPC or OnRep for color changes, how can I determine the winner of the game' etc.

[peak sentinel]

chat system
"should I pass Text or String as parameter" another nice question 😄

[rocky stag]

yes . i checked source . i dont know the best way . im gonna use a reliable client rpc for this i think . i found another way but its so tricky to do . using a boolean and timer after setting the property on server . and use that flag in ACTIVE_Override

[lost inlet]

why not use push model then?

[rocky stag]

What is that ?

[lost inlet]

you can read what's in PushModel.h, but it allows you to explicitly invalidate variables as changed rather than comparisons being run every replication update

[rocky stag]

Thanks . I will check that .

PushModels are so cool didnt know about that . thanks i think this helps.

[rocky stag]

Oh thats not cool 🤣 . Push models just support static arrays not TArrays .

[rocky stag]

Am I Right ?

[meager spade]

no

[rocky stag]

you mean i can use them in push models ?

[meager spade]

yes

[rocky stag]

what did i do wrong ?

Its a TArray of EnumType

[meager spade]

show the member

[fossil spoke]

Did you add the right #includes?

[rocky stag]

UnrealNetwork.h?

[fossil spoke]

#include "Net/Core/PushModel/PushModel.h"

You need that one as well

[rocky stag]

Oh the structure type is wrong here :d

[fossil spoke]

You also need to add NetCore to your Build.cs

[rocky stag]

After changing proprty type i got linker error and this helped .

Thanks for helping me 🙏

[fossil spoke]

👍

[lime vortex]

im working on a server and for some reason the server stops here [2021.10.07-19.19.27:159][706]LogNet: AddClientConnection: Added client connection: [UNetConnection] RemoteAddr: 127.0.0.1:55649, Name: IpConnection_0, Driver: IpNetDriver_2 IpNetDriver_2, IsServer: YES, PC: NULL, Owner: NULL, UniqueId: INVALID

does anyone know

[quartz smelt]

Hey quick question, if I wanted to spawn an actor based on someones save, am I able to use the game instance or should I call the save?

[misty plover]

if you want to save a players location when they sign out or something along those lines you would want to use a USaveGame then you can get the location from that players save game slot when they sign back in

[chrome bay]

You can't no

[silent valley]

On client, is there any way of knowing inside ::EndPlay() if an actor has been Destroyed by server vs Destroyed thru relevancy?
I want to play a deathfx on client but it's also triggering when the actor is no longer relevant...

is there some other pattern that is useful in this case? e.g. I want to do something on client when an actor is killed. RPC is no good because the server has destroyed the actor. I suppose I could delay an arbitrary amount then destroy on server but seems a bit hacky.
Could also send RPC via the player controller or pawn, but then there's potentially a mismatch of the RPC comes at a different time to the actor being destroyed...

[chrome bay]

You can send a reliable multicast RPC. Probably one of the few cases where it actually makes sense.

The RPC will come through before the actor is destroyed, that's guaranteed (so long as you call it before destroy ofc)

But otherwise there's no way to know whether it was destroyed via relevancy or gameplay on the client.

[meager spade]

should it actually matter tho?

i have projectiles that do stuff via EndPlay, BUT i have a replicated property which lets me know if its been detonated on the server (think RPG rocket)

i can check this bool for stuff like that. Most of the time though, your End Play logic should not care if its relevancy or it being removed from the world by DestroyActor.

[elder sage]

simple question, but what should I do to make things like PlayerController's Input Pitch Scale persistent between levels?

or if I use a game instance for this, what event should I use to trigger my Player Controller grabbing those values?

[empty axle]

it should be the same if you are using the same player controller on your levels

it might be that you are not

[elder sage]

I am, so

event tick runs in both levels, but the value is reset

[empty axle]

how are you setting it?

[elder sage]

through an event in the ui

that doesn't seem to be the problem, as it prints the value I set it to, until the new level loads

[silent valley]

I don't know, ideally it would not matter, but if it's playing a loud sound effect it might!
I did think about a replicated bool, but is there any guarantee a replicated var will be sent before the actor is destroyed?

[chrome bay]

There's not

Usually you hide the actor then give it a lifetime so that it has time to replicate

But it's a "lossy" method so to speak, i.e. not garaunteed

[empty axle]

New player controller is spawned so your old value doesn't really matter. You have to save it for example in your settings object and apply them again on a new map load

[thin stratus]

You could look at "TearOff". Which calls "TornOff" on Clients and will stop the replication, so Clients can do whatever they need with the Actor and then destroy it themselves.
You usually do this in cases where the Actor still needs to do stuff but shouldn't replicate anymore, like a killed Character that should play a Death Ragdoll or so.

[silent valley]

yeah I was looking at that but it's a bit tricky for this usecase. In my tests the replicated bool approach seems to be pretty reliable, especially given I'm also introducing a delay, and if some of the fx don't spawn sometimes then I don't think it's a big deal.

[thin stratus]

Right, yeah you can just do a 10s delay and destroy then and deactivate everything in an OnRep in the meantime (e.g. Collision and Visuals)

There are lots of ways I gues

[viscid lantern]

Hi guys. Does anyone have some good tutorial links to unreal multiplayer for mobile? Thanks

[hybrid zodiac]

Hi everyone. I'm messing around with networking profiling and just wanted to check what I'm looking at. I thought I'd try some stress-testing (such as replicating an array of 2000 constantly-changing FVectors) to see what kind of numbers I get. I tried running a standalone game with separate server and ran stat net on the client, and saw this:

https://gyazo.com/0d30c7d4bbd8004849bef69fdb84c185

Does the "in rate" refer to how many bytes the client is having to download from the server per second? i.e. the client is having to download just under 100kb/s of data?

I also ran the net profiler for a simple PIE session with 3 clients and a listen server. The generated file notes around 362kb/s bandwidth:

https://gyazo.com/5fc1d4dc6f004dcabe43af9e42353a3e

Is this only from the server's perspective (i.e. the server is having to push 362kb/s of data across all 3 clients), or is this including data inbound to each client as well? Just want to make sure I understand these numbers correctly

[woeful ferry]

Is it possible to change replication conditions in runtime?

[hybrid zodiac]

@woeful ferry As in when a variable should be replicated? You can do this with a DOREPLIFETIME_CONDITION macro with COND_Custom. In simpler cases you can also do it with DOREPLIFETIME_ACTIVE_OVERRIDE where you can toggle replication of a variable on and off with a boolean

If you mean change the logic for replicating a variable completely, I don't think so. You would have to define one set of logic to cover it

[woeful ferry]

Yes, I meant from like having no replication condition to only replicating to the owner for example

[hybrid zodiac]

I noticed there is a function called ResetReplicatedLifetimeProperty

In C++

There's no documentation on it though so I don't know if it works in the way you're looking for

[woeful ferry]

Ah, it's just a minor thing I was thinking of 😛 I was just curious rather than needing it

I changed our health component to use owner only on its health, which is logical for our player character, but not for other stuff that uses the same component

that's why I was curious

[vague fractal]

Is there a way to see the "reliable buffer" ?
Like that you can see how filled the buffer is

[chrome bay]

Might be able to pull the information from the actors' actorchannel

IIRC max number of unacked reliable packets is 256

[quasi tide]

Apparently the internet is divided on this - if you have an array of structs, does the entire struct get replicated when a value in the struct changes or just that value?

[chrome bay]

Should be just that value, unless the struct has a custom NetSerialize implementation

Arrays do their best attempt at delta serialization IIRC

[quasi tide]

I'm pretty sure just the value of the array gets replicated, at least that's what I've found on the interwebs. But when it came to structs, there were a bunch of mixed responses. Some saying the entire array gets replicated, the entire struct gets replicated, or just the changed value.

[chrome bay]

Taking an educated guess at this point but IIRC, so long as the property can be identified by index + property offset it'll be just that property that gets sent, but the header that identifies the property gets longer and longer ofc as you get deeper and deeper recursion

Might test that theory tbh..

[young tide]

Hi. I have a replicated object that is showing a widget when player is looking at it. How do show this widget only to player that is pointing at it?

[chrome bay]

@quasi tide Actually, I might be wrong - it may indeed be the full item

Want to know myself now so going to dig through

[quasi tide]

The division continues

[chrome bay]

If you're using FFastArraySerializer, it's definitely the full item, I know that much

[meager spade]

FastArray sends the entire array?

i thought it just sent that element

(that was marked dirty)

[chrome bay]

Yeah just the changed element I mean

But it's always the full element

[gray orchid]

is there a way to make a fortnite random matchmaking for an fps game?

[chrome bay]

Digging through source.. it looks like with regular TArray it actually might send the individual property of the struct. Quite hard to work it out. It seems to be recursively looking at property handles

FRepLayout::SendProperties_r() that is

[eternal canyon]

Yes but the question is so general that no one would really be able to help u

[chrome bay]

I seem to remember a golden rule was that:

• If you are adding/removing items a lot but the items themselves don't change, use FFastArraySerializer.
• If you are not changing array count often, but the items themselves are changing often, use regular TArray

[gray orchid]

well im looking for any help I can get any methods or blueprints

[eternal canyon]

Ah ok so if u have a static number of elements basically?

[chrome bay]

I did discover a nasty bug recently which is that FFastArraySerializer's wrapped with a regular USTRUCT do not use delta serialization when they are actor properties, even though they should.

static or at least infrequently changing count

Because it's wasteful to use FFastArraySerializer if the item count is static, and each item changes slightly

Because you're always going to be sending the full item which might have many members

So it's a trade-off

[eternal canyon]

Good to know!

[chrome bay]

This was the bug I was talking about

Actor
{
    Struct StructMember;
}

struct
{
    uint8 SomeByte;
    FFastArraySerializer SomeArray; // <- Doesn't use delta serialization :(
}```

It looks like when the engine "unwraps" the struct member properties, it doesn't preserve the network traits for them

Seems like an oversight

There's also another annoying bug with FFastArraySerializer which is that PostReplicateChange() doesn't get called on the array when GUID's are resolved

Had to implement an annoying workaround for that

...incase anybody wants it

Then you just do this instead:

{
    return HT_NetSerializationUtils::FastArrayDeltaSerialize_WithRemapCallback<FHT_DivisionMember, FHT_DivisionMemberList>(Members, DeltaParms, *this);
}```

[eternal canyon]

They should make a save message thing for individuals

Like pins but for anyone

And only u see it

[chrome bay]

Yeah.. need bookmarks

[meager spade]

i thought fast array runs postchanged when the GUID is resolved

i am sure i experienced that..

but that is interesting to note

[chrome bay]

It does on the individual element, but not on the array

Wierdly...

Rep notifies will fire ofc

[meager spade]

i mean i only use the per item Post/Pre

[chrome bay]

ahh kk

[meager spade]

not the entire array post/pre

so maybe that is why i have never ran into an issue

[thin jacinth]

Does steam have its own multiplayer platform, where u can have multiplayer in your game using steam?\

hmm intresting.

[stoic rover]

@chrome bay Are you familiar, with multiplayer and steam at all? If so i just had a question, and sorry if im disturbing you.

[sinful tree]

Ask your question here anyway... Someone may be able to help you.

[stoic rover]

So i have multiplayer set up, it works in engine, and it works after packaging, but after its uploaded to steam, it dosnt work. Its something with steam and im not sure what it is.

[dawn delta]

When testing MP on a single computer, all the network clients still return true to "Is Locally Controlled". Makes sense since they are all technically "local" on the same computer. Anyone know a way to differentiate them from being pure clients vs. clients on the same PC as the listen server? This is PIE testing. Works normally w/ multiple Standalone instances.

[kindred widget]

@dawn deltaIsLocallyControlled will return true for any actor that is controlled by the local controller.

This is regardless of testing type, or server type.

[dawn delta]

ya. I guess when PIE testing multiple clients those "PIE clients" don't really behave as seperate clients because of this behavior of IsLocallyControlled

since the "server" plus 2 "PIE clients" are all the same local controller

[chrome bay]

IsLocallyControlled is correctly true on network clients

[dawn delta]

yep

[chrome bay]

They all have their own controllers though, it's not the same controller.

Calling IsLocalController() on the Server, on a Clients' player controller, would return false.

[dawn delta]

ok, that's a way I could handle this case for PIE testing. Persist the server's controller and treat the others as seperate

[chrome bay]

PIE and non-editor would be the same, even on different machines

"Local" means local to that instance of the game, not the actual hardware machine

[dawn delta]

right, but in PIE arent all the "clients" sharing the same instance?

[chrome bay]

Negative

They're all new "instances" of the game

[dawn delta]

ok, thank you. My error must be elsewhere then. The "server" is returning true for IsLocallyControlled for all clients controllers, which is what led me down this path.

[chrome bay]

Likely being called on the wrong controller

It would return true calling HasAuthority() on them, but not IsLocalController()

[dawn delta]

thank you

[cosmic badge]

anyone know if there is a way to get the current bound port [as unreal will just keep trying to find one beyond 7777] within blueprints?

nevermind i just did it in c

[vivid seal]

When working with Root Motion Sources, do i need to apply them on remote clients? Right now I'm predictively applying them on owning client, then applying them on the server, and it works correctly, and looks okay even with a lot of lag. If i also apply on other clients, i don't see a difference, so i was wondering if this even does anything

[tepid pawn]

Hey guys, Where can I find all the blueprint nodes listed along with what they do and how they work?

[elder sage]

well there are a lot of nodes, so you either just start following guides or check if there's a node for what you need every time you need to do something new. There's documentation for all of it online

[smoky crag]

Hey guys, I have a quick question, in order to interact with object in a game, which way to find object is better line trace from camera center or sphere collision detection?

[bitter oriole]

There isn't a better one, they're just different tools

One is a line of sight check, so colliding objects would interfere and you'd have to see the object

The other one is just a distance check

Could try both and see which one feels best

[smoky crag]

Got it thanks. Do you know compare to performance which one is better?

[bitter oriole]

It's irrelevant really

Depends on the game quite a lot, too, so hard to say

Get the game right, worry about performance later

[smoky crag]

Got it. Thx!

[lost dune]

Hello , i move characters AI to location , It works when running under one process but not with Separate server.

I'm stuck.

This is exactly the same script not working on separate server.

[barren patrol]

Has anyone successfully done the offline -> manual connect to server flow in the Play In Editor mode?

using Launch Separate Server = true with Standalone mode

I am trying to test my main menu -> get in game flow.

current issue is that the PIE server seems to be launching my main menu level also.

what is the magic incantation to make the PIE server start up with my game map?

[barren patrol]

In the Project Settings -> Maps and Modes I have the Server Default Map set to my game map, that didn't work

I also tried setting the PIE preferences -> Server -> Server Map Name Override to my map name but it doesn't seem to do anything either.

LogPlayLevel: PlayLevel: No blueprints needed recompiling
PIE: New page: PIE session: MenuEntry (Oct 18, 2021, 5:52:24 PM)
LogPlayLevel: Creating play world package: /Game/MOBATest/Maps/UEDPIE_0_MenuEntry```

The edit output log on the 4th line shows UEDPIE_0 (the server) being set up with my menu entry level even though I set all these things

[rocky stag]

what is diffrence between DOREPLIFETIME WITH PARAMS FAST and DOREPLIFETIME WITH PARAMS ?

[chrome bay]

Right Click -> Peek Definition

[rocky stag]

nothing here

DOREPLIFETIME is wrapper on DOREPLIFETIME WITH PARAMS . but what is the diffrence between reqular and the DOREPLIFETIME WITH PARAMS FAST ?

[chrome bay]

Well, you're looking at it. By the looks if it the _FAST version caches some static variables at startup time. Doubt it makes any real-world difference

[dark edge]

I've gotten it to work but it's just as fast to just launch clients separately, and closer to the real thing.

[dark edge]

For first person I'd do a line trace. For 3rd I do a sphere trace then filter by distance and direction to select what to interact with.

New World interaction would be a sphere trace, Skyrim interaction would be a line trace.

[rocky stag]

Thanks .

[meager fable]

with advanced sessions plugin how can I join my steam friend's session?

[winged badger]

you need a list of sessions, not list of friends

to start with

[meager fable]

yeah but I want to join my specific friend's session

like create a list of session held by friends and let user choose which one to join

[winged badger]

don't know if advanced sessions knows how to do that

you normally do that by using steam client API

click on friend ingame, join game

then game needs to handle

FOnSessionUserInviteAcceptedDelegate

to actually join that session

[meager fable]

okay, will look into that

thanks

[winged badger]

which is basically

if (bSuccessful) { JoinGameSession(InviteResult); }

[meager fable]

is it c++ only or can I access it in BP?

[winged badger]

that depends on AdvancedSessions

and i don't know that plugin

[meager fable]

okay, I'll dig into that

thanks

[twin juniper]

hello guys iam using ue 4.27 source version so when i call bReplicates its saying "bReplicates is inaccessible"

so how to access that

[bitter oriole]

SetReplicatedByDefault

[twin juniper]

how?

i didnt get you

[bitter oriole]

Use SetReplicatedByDefault() instead

[twin juniper]

ok

its saying undefined

just give me line of code how to write

[bitter oriole]

SetIsReplicatedByDefault()

https://docs.unrealengine.com/4.26/en-US/API/Runtime/Engine/Components/UActorComponent/SetIsReplicatedByDefault/

[hybrid zodiac]

Hi everyone. If I am replicating a TArray and I want to utilise RepNotify, is there an efficient way to only see the items that have changed, or do I need to iterate through the whole array to figure out which elements have been modified?

[twin juniper]

so @bitter oriole its working but now my health bar is not full and my health is 0 even i after i set my to 100

and damage is not applying to clients

its applying only to sever

[hybrid zodiac]

@twin juniper Is the parent actor also set to replicate?

[twin juniper]

@hybrid zodiac in line 23 i did but still my clients health is not updating

can check here right is sever and rest are clients

you can see print string in left that damage is happening in server only not in client

[hybrid zodiac]

@twin juniperWhere are you printing the health? If it's in the TakeDamage function then you're probably printing the number out before it's replicated to the client. Try printing the health in Tick instead

[twin juniper]

iam just printing current health and also iam using PainCausingVolume from unreal assets

when ever player steps on that he will take damage

[rocky stag]

I think with push models you can . with push models you can replicate just changed index with value but i dont know if it works on dynamic sized arrays .

[chrome bay]

You have to figure it out yourself. You can pass the "last" value of the array in as a const-ref parameter and compare

Alternatively if you're using FFastArraySerializer, it has internal callbacks for items

[hybrid zodiac]

@rocky stag @chrome bay Thanks both! Not heard of a push model before. I'll take a look into both suggestions. The array will be a fixed length array of structs in which items will have values changed fairly frequently

[chrome bay]

May want to use a static array

Actually doing some tests right now regarding that 😄

[hybrid zodiac]

Ooh definitely keep me updated then. The array will be around 200 items in length max, so it wouldn't be too demanding to just loop through looking for changes

[chrome bay]

It seems that as far as actual size-of-packets is concerned, a static array has identical cost to a member

Which makes sense, as they can statically determine property offsets by just unfolding it

[chrome bay]

Hmm. I mean, my findings so far are showing TArray being considerably cheaper than FastArraySerializer :/

[hybrid zodiac]

If I wrap a Tarray into a struct, would it still efficiently replicate deltas? Thinking of having an "index" containing an array of bytes with values pointing to which indexes have changed in the array

[chrome bay]

Should do, so long as the struct is a member var. Will test that as well

[hybrid zodiac]

Cheers :-) will try as well when at my computer next

[chrome bay]

Results are pretty interesting to be honest. FFastArraySerializer uses nearly 4x the bandwidth doing the same operations

[oblique inlet]

So I'm trying to re-organize my code for firing weapons so that my Server functions are inside the gun object and not just being called inside a Server function inside my character. Would this work if my weapons were actors or would I need to make them components or something else?

[chrome bay]

They can and probably should be actors, just need to be be actors owned by the character they belong to

Components have additional RPC/Property handle overhead

[oblique inlet]

yeah it would also be easier to make it an actor for other purposes

[chrome bay]

It's the most common approach. See ShooterGame

So a few stats from my little test... testing a struct with two int32 properties

Property Change: 6 Bytes
C-Array Change: 6 Bytes

TArray Add: 13 Bytes
TArray Change: 8 Bytes
TArray Remove: 4 Bytes (Index 0) 3 Bytes (Other Index)

FastArray Add: 34 Bytes
FastArray Change: 29 Bytes
FastArray Remove: 23 Bytes```

BRB deleting all my FastArray's

Need to do more testing but right now starting to think FastArray is really only designed for large arrays of large structs, rather than many small items.

As otherwise, the built in TArray delta serialization is way cheaper.

[oblique inlet]

so now it works from the listen server but nothing happens when it is fired from the client

[chrome bay]

Make sure the character is the "owner" of the weapon when you spawn it

You can only call RPC's on actors you "own"

[oblique inlet]

I've set the owner in the spawn params. When I set it from the actor itself it throws an error

[chrome bay]

And there's an ownership chain which eventually leads back to the player controller

Also make sure you only set it server side, and spawn the weapon server side ofc

[oblique inlet]

oh that would be why

iirc beginplay bets called on both sides and I can just check which side I'm on right?

[chrome bay]

BeginPlay will fire on both yeah

Should only spawn the weapon if you're the authority

Then the weapon actor itself would be replicated

[oblique inlet]

if I do

    if (WeaponClass && HasAuthority())
    {
        FActorSpawnParameters spawnParams;
        spawnParams.bNoFail = true;
        spawnParams.SpawnCollisionHandlingOverride = ESpawnActorCollisionHandlingMethod::AlwaysSpawn;
        spawnParams.Owner = this;

        FTransform weaponTransform;
        weaponTransform.SetLocation(FVector::ZeroVector);
        weaponTransform.SetRotation(FQuat(FRotator::ZeroRotator));

        Weapon = GetWorld()->SpawnActor<AWeaponBase>(WeaponClass, weaponTransform, spawnParams);
        Weapon->SetOwner(this);
    }```

it throws an error saying weapon is null only when I fire on the client

firing from the server works fine

and when I remove HasAuthority() nothing happens

[eternal canyon]

Yea I thought that is what it is intended for. For large amount of data.

[chrome bay]

@oblique inlet both the Weapon property and the actor need to be replicated

And there's no guarantee the weapon will have replicated when you go to fire it, so you need to handle it being nullptr safely

[oblique inlet]

ah ok

what do I need to include for DOREPLIFETIME? I forgot and I can't find it anywhere

[lost inlet]

Net/UnrealNetwork.h probably

[oblique inlet]

that's it thanks

I'm getting this error

1>  C:\Program Files\Epic Games\UE_4.27\Engine\Source\Runtime\Engine\Classes\GameFramework/Actor.h(149): note: see previous definition of 'GetLifetimeReplicatedProps'
1>C:\Users\nicol\OneDrive\Documents\Unreal Projects\TestFPS\Source\TestFPS\TestFPSCharacter.cpp(91): error C2039: 'Weapon': is not a member of 'AWeaponBase'
1>  C:\Users\nicol\OneDrive\Documents\Unreal Projects\TestFPS\Source\TestFPS\WeaponBase.h(10): note: see declaration of 'AWeaponBase'
1>C:\Users\nicol\OneDrive\Documents\Unreal Projects\TestFPS\Source\TestFPS\TestFPSCharacter.cpp(91): error C2672: 'UE4Asserts_Private::GetMemberNameCheckedJunk': no matching overloaded function found
1>C:\Users\nicol\OneDrive\Documents\Unreal Projects\TestFPS\Source\TestFPS\TestFPSCharacter.cpp(91): error C2660: 'GetReplicatedProperty': function does not take 2 arguments
1>  C:\Program Files\Epic Games\UE_4.27\Engine\Source\Runtime\Engine\Public\Net/UnrealNetwork.h(185): note: see declaration of 'GetReplicatedProperty'```

[lost inlet]

show declaration and implementation of your GetLifetimeReplicatedProps

[oblique inlet]

I just forgot to declare it

I get the same errors though

void AActor::GetLifetimeReplicatedProps(TArray< FLifetimeProperty >& OutLifetimeProps) const
{
    DOREPLIFETIME(AWeaponBase, Weapon);
}```

protected:
void GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const override;

    UPROPERTY(Replicated)
    class AWeaponBase* Weapon;```

[lost inlet]

huh?

why is AActor there?

why doesn't it call the base?

[oblique inlet]

that was an old error message I updated the message above

[lost inlet]

why

[oblique inlet]

copypasted the wrong code

it's actually cpp void ATestFPSCharacter::GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const { DOREPLIFETIME(AWeaponBase, Weapon); } in the file

sorry for the confusion

[lost inlet]

then you're not going to have AWeaponBase there either

and call the Super

[oblique inlet]

🤦‍♂️ will do

it works! Thank you

[peak sentinel]

Anyone ever tried to implement FRootMotionSource to their custom movement component? I made a replicated pawn movement component a couple months ago and now I want to implement root motion replication, guess there isn't any guide unless source code?

This time unlike many other class/struct, header file looks well commented though

[quasi tide]

Working on creating a container, like a chest pretty much. I am currently doing all of my interactions on the server. How can I tell the client to display the UI for the container? Because everything runs on the server, it will activate the UI on the server. I've tried setting the owner to the interacting actor and then running a Run on Owning Client event, but that does not work.

[sinful tree]

Your flow should probably be:
From Player Controller or Character > Interact Key Press > Check Target Actor is in range / can currently be interacted with > Run On Server, passing reference actor the player wants to interact with > Server validates distance / interaction state and if valid > Triggers required interaction event on the required actor OR if it's to display something to the player do a "Run on Owning Client" event to display the appropirate UI.

[quasi tide]

Yeah - that IS my flow

But when the client interacts with the chest, I can't get it to tell the client to show the chest UI

[sinful tree]

But you said you're doing it from the chest right? My flow suggests running it only on the Character/Controller.

[quasi tide]

The chest is what has the interaction event

This is on the player character

[sinful tree]

Ok, so then you should be able to pass back to the "interacting player"

[quasi tide]

Then, w/e object has the interface implemented, will handle the reaction.

Okay - so have a Run on Owning Client on the player, and in the chest, call that event?

[sinful tree]

Yep

You can use interfaces back to the player too if you want, then have that interface call the event, however you wanna do it.

[quasi tide]

Alright - sweet. Thanks. Now to work on the transferring logic.

Just missed that last step. Was off with the Run on Owning Client

[barren patrol]

Asking 1 more time here, has anyone successfully used the PIE play mode with Play Standalone and Launch Separate Server to simulate a main menu -> connect to dedicated server flow locally?

I launch the client from my main menu entry level and my server is launching the menu level. I can't seem to get the server to start up on the game level instead. I tried Server Map Name Override in the play settings and also changing the Default Server Map in the Project Settings, but the Launch Separate Server in PIE does not appear to respect them.

[vivid seal]

I've actually been working on Root Motion Sources and replication the last few days. With CMC its fairly straightforward (you just run the source predictively on the client then again on the server, and it seems to work). Not sure about with a pawn movement component.

[vivid seal]

speaking of which, what would you guys recommend doing for something like a knockback. no prediction, just server-authority applying a push to players in an area, or a player hit by something. Using Launch Character on the server with latency causes clients to "jump" on their screens. Would a root motion source also be the answer here, and just replicate it down? or is there some way to have the client launch not jump

[fierce grove]

hello guys do you think that you could "replicate" locations with Firebase for Micro instanciation on 2D game Or simple 3D topdown ?

[meager fable]

how to handle joining a steam friend's session? Currently I can click on join game when my friend plays it but nothing happens

is there some delegate that fires or sth?

[fierce grove]

using advanced steam sessions?

[meager fable]

and how would I go about that?

[bitter oriole]

When clicking join there should be an online susbsytem callback, that your game can subscribe to, and that will provide the session id, you can then join from that through online susbystem

Look at advanced sessions (no need for anything steam specific)

Shootergame might support it too so you have two examples with code

Only works outside editor, two Steam accounts on different machines required

[meager fable]

thanks, will look into it

[peak sentinel]

When exactly an COND_InitialOnly variables become not replicated?

first PostReplication()?

[meager spade]

after first replication of the actor

so initial only, those properties get sent in that initial actor bunch

[peak sentinel]

It should be available to change in PostInitializeComponents() then

[meager spade]

yes

[peak sentinel]

Thanks

[winged badger]

ummm, no

PostInitComponent comes first

it will be available in PostNetInit / BeginPlay

[meager spade]

he means modify before the first bunch is replicated to client

i assume

[peak sentinel]

Yes

[winged badger]

as long as its synchronous after spawning the actor

it will be in initial replication

[meager spade]

right, you have a window

actor replication is not instant

[winged badger]

net driver doesn't replicate actors as soon as they are spawned

net broadcast tick is on the end of the tick

[meager spade]

anything in the same frame as (Finish Spawning is called), is safe.

[winged badger]

deferred construction comes in handy, as the replicated variable then gets set on both server and clients before beingplay ius called

which allows you to not branch the beginplay logic based on authority

[peak sentinel]

Yeah, I was surprised when deferred spawning actually syncs the changes

Thanks for the informations

[winged badger]

as soon as you spawn actor, server calls BeginPlay

if you assign stuff after, its after BeginPlay, except for deferred spawn and stuff assigned prior to FinishSpawning call

on clients, initial replication comes in same packet as instructions to spawn the Actor

[peak sentinel]

Wasn't beginplay totally local? Do server replicate it to clients?

I thought its being determined by clients

[winged badger]

and client runs all OnReps, then PostNetInit, then BeginPlay

[peak sentinel]

I see

[winged badger]

in that order

there are few more discrepancies, because its unreal

like server won't call construction script before it finishes spawning

while clients won't wait for replication to call it 😄

[hallow acorn]

hey guys.. I'm trying to force the movement of a Player character while using the navigation system, so I thought of using UAIBlueprintHelperLibrary::SimpleMoveToLocation and InEditor seems to work great but when using game builds, sometimes the Player character moves mega slow.. no obstacles or anything in the way.. any ideas? thanks 💙

[sage isle]

I made a full menu system for changing characters and stuff so the player can change between the different characters I made only I realized after testing in multiplayer that the game no longer possesses the newly spawned characters. I was using the possess node in the menu widget which I now know doesnt work but I am struggling to fix it. I tried moving the logic around so possessing the character was in the player controller but that wont work either, everything works except actually taking over the character. So what am I missing, the possess node is for the server only but can anyone explain more cause it does not want to cooperate with me.

[chrome bay]

Widgets are local/client-only. If the call to possess is in the widget then it's not happening on the Server.

[sage isle]

yeah so I tried moving it to the player controller and it still wont do anything, I am trying to get it to work on in the game mode currently but I cant get it to possess no matter what I do

[winged badger]

@hallow acorn best way to move it imo, is with MoveToActor node, with GoalTracking enabled, spawn a MoveTargetActor, and have the player just chase it around all the time

you need to move somewhere, you teleport MoveTarget, you need to follow, you attach your MoveTarget to whatever you're following, you need to stop, you teleport it to yourself

[calm sundial]

No stupid questions time. If I'm a listen server, can I still send an RPC to me as a Client?

Or rather, will ClientMyRPC still be called on Listen Server?

[peak sentinel]

Afaik if you're the owner of that actor, yes

But I'm not sure

[calm sundial]

I would expect it to work

[peak sentinel]

Client RPC gets the owner actor and sends the packet to it, so it should work i assume

[hallow acorn]

oh sounds great, but MoveToActor works with PlayerController? or only with AIController?

[winged badger]

PC doesn't have a PathFollowingComponent

you either need to make it work with PC in c+

or put a replicated AIController between PC and Pawn

and getting predicted movement to work is another bag of nails

epic kinda hardcoded some stuff with CMC to work only when directly possessed by PC

[peak sentinel]

Kaos had some messages .. somewhere around 2 or 3 years ago explaining how he did predicted movement for this situation

[hallow acorn]

that's why I used SimpleMoveToLocation haha, cuz it received any Controller.. but true, I'll have to check on that, thanks a lot! 💙

[winged badger]

it ran okay without prediction

but was short of production level

it took us one afternoon to switch to predicted model in the end, but we both had a good idea what we were doing

[meager spade]

yeah, using server to move, was a pain

the lag was unreal, and not good for players

[hallow acorn]

yes it is haha but will try Zlo's idea.. you got any more ideas?

[meager spade]

well i work with Zlo

SimpleMoveTo will actually give the PC a PFC

so not sure why you are having issues

[hallow acorn]

right? it's weird cuz Editor tests goes great and on builds for some reason the speed goes to hell.. the worst part, not always happens

[sharp pagoda]

Do both 'Run on Server' and 'Run on Client' work on singleplayer (Play Standalone)?

I'm trying to integrate a network replicated plugin and I was thinking if I might as well use what it currently have than modifying it

[chrome bay]

They do yeah

[sharp pagoda]

Thanks, Jambax!

[cosmic trail]

Is there no already quantized FVector2D?

[harsh lintel]

can a server RPC called from a client fail due do packet loss?

[median crypt]

Does anyone know a good resource to learn a bit more about controlling multiple characters, specifically I need to learn about multiple gamepads inputs

Like say you have a few player controllers each controlling a different character

I'm not quite sure how I assign or how the engine automatically assigns a gamepad to a player controller

[lost inlet]

yes but it'll retry if it's marked Reliable

[misty stump]

Anyone know why I might not be able to find Steam lobbies? I'm using my own steam game ID, steam enabled in ini, I have bUselobbiesifAvailable set to true, i have Search for lobbies set in the query. bshouldadvertise, busepresence, ballowinvites,ballowjoininprogress, are all true, public connections set to 5; map opens with ?listen. In the dev logs it prints that a steam lobby is created with a unique lobby ID with lobby type 2 on host and Steam P2P IP/Port. But search always returns successfully nearly instantly with 0 lobbies found. I myself am signed in on steam and so are my friends who are separate PC's and steam accounts. It shows the correct game title in the steam overlay. Any idea what might be going wrong? If I enable LAN the search returns 0 lobbies as well when on the same network.

[misty stump]

{
    //Set Session Settings
    FOnlineSessionSettings SessionSettings;
    SessionSettings.bIsLANMatch = bIsLAN;
    SessionSettings.NumPublicConnections = 5;
    SessionSettings.bShouldAdvertise = true;
    SessionSettings.bUsesPresence = true;
    SessionSettings.bUseLobbiesIfAvailable = true;
    SessionSettings.bAllowJoinInProgress = true;
    SessionSettings.bAllowJoinViaPresence = true;
    SessionSettings.bAllowInvites = true;

    Sessions->CreateSession(0, SESSION_NAME, SessionSettings);
} 

void UGameInstance::Search()
{
    if (!Sessions.IsValid())
    {
        UE_LOG(LogTemp, Warning, TEXT("Invalid Session Interface on Search Attempt"));
        return;
    }

    SessionSearch = MakeShareable(new FOnlineSessionSearch);
    if (SessionSearch.IsValid())
    {
        //Set Query Params
        SessionSearch->MaxSearchResults = 20; //update val
        SessionSearch->bIsLanQuery = bIsLAN;
        SessionSearch->QuerySettings.Set(SEARCH_LOBBIES, true, EOnlineComparisonOp::Equals);

        UE_LOG(LogTemp, Warning, TEXT("Starting Search for Online Games..."));
        Sessions->FindSessions(0, SessionSearch.ToSharedRef());
    }
}

[harsh lintel]

if I have some logic that only runs client side on Tick(), and I need to call server RPCs from this client Tick() logic, would it be bad for a multiplayer game?

[peak sentinel]

depends™️ but it needs to be unreliable in any case

[twin juniper]

hello, is it here that i post this? im trying to make a photocamera in a vr game. so u can actually take pics and it saves like phasmo. how do you capture a picture like that? is it witha 2d scene capture?\

[hallow fiber]

Can UObjects replicate variables? Because I noticed it has the GetLifetimeReplicatedProps

[clever plinth]

Is there any meaningful difference between the reliability of a UFUNCTION(Client, Reliable) RPC from Server -> Client vs a replicated property? In this context, ignoring:

• The fact that some replicated property values might not arrive (ie. if the value changes quickly on the server and the intermediate value is not sent or is lost in transit). For the the purpose of this question, I am interested in only the final value.
• The fact that properties will replicate to new clients who join late, while RPCs only apply to a currently connected client.

In other words, ignoring those two things, are there advantages of one over the other for communicating a piece of information that needs eventual synchronization on the client? (Hope that makes sense)

[fossil spoke]

Unless your using Push Model, Replicated variables do require some resources to be checked if they have a changed value by the Server.

An RPC will have a higher network overhead than a single replicated variable, assuming of course they are the same type.

[clever plinth]

Ok, thank you that is helpful.

[dull lance]

at the same time Reliable RPCs are guaranteed to get sent in the next buffer

whereas Rep Variables will just Eventually get there

[clever plinth]

This is maybe getting into the implementation details a bit, but assuming network traffic is below some threshold - will the engine always try to replicate a variable as fast as possible?

[fossil spoke]

Yes, though the Actor itself will be throttled by its relevancy and frequency.

Which subsequently causes replicated variables to change when they are sent.

[sinful tree]

I think you're on the right path with a 2D Scene Capture. You just need to make it so that the capture is taken on all clients.

[fossil spoke]

RPCs will always be sent as soon as possible, they will only trigger if the Actor that owns them is net relevant to the receiver.

[dull lance]

also let's not forget that RPCs that don't exec on a given machine (relevancy or that the client joins later) will end up in desynchronized states

[lost inlet]

which is where push model is the way to go if you're on 4.26+

[clever plinth]

I guess this might be a bit specific and I'll just have to experiment with it, but I have something like:
(1) Player tries to pick up world object
(2) Player RPCs to server to request object
(3) Server checks, and RPCs reliably back to client to indicate success/failure
(4) World object item has OwningCharacter set to the relevant player character (so other clients can see that ownership has transferred)

I don't like this pattern though, because it involves the same information being sent twice in the case of pick-up success (namely the RPC to client and OwningCharacter). I want to change it so that the OnRep_OwningCharacter just acts as the successful indicator. In my testing this seems fine so far, but was wondering about the trade-offs for the client who is doing the picking-up (ie. are they getting the result less responsively).

[dull lance]

(3) should probably be a ReplicatedUsing variable

also, (4) doesn't need to happen depending on how you handle the owning character.

[clever plinth]

You mean it could be COND_SkipOwner or something?

[dull lance]

Not at all. Making a given Machine the owner of your interacting object is not mandatory

it's an architectural choice

that allows you to code stuff in a given way

but for instance, for pickup/interaction, it could be your Character that RPCs, and that currentHeld is a rep variable

in that model, the item never needs to have its ownership transferred

[clever plinth]

Ah I see what you mean.

[maiden ermine]

Anyone know of mechanisms for server to server communication in the engine?

[meager fable]

How can I disable joining my session? Sth like

UGameInstance::OnLobbyLeave()
{
GetGameSession()->SetJoinable(false)
}

[elder sage]

in order to make a display name for the player, should I actually do something to set the player controller's name, or should I just have a string variable for that?

[thin stratus]

PlayerState has the PlayerName already

[thin stratus]

There is an UpdateSession call, similar to create session where you can supply new settings. That might help

[meager fable]

@thin stratus thanks, will look into it

[midnight crag]

Hi There, I also came across similar did you solve it?

[hollow halo]

sorry, I don't quite remember what I had done to fix it because shortly after my drive got corrupted and I lost most of my files :/

[sharp hound]

Hi everyone, I have a multiplayer project. Every player has a playerstate with the playername. When I collide with another player I'm trying to get other actor playerstate but it always returns my playerstate instead of the other one..I'm using blueprints. Thanks!

This is the blueprint : https://blueprintue.com/blueprint/xzzdusrg/

[winged badger]

DisplayName is a little problematic there

there is no guarantee whatsoever that those are named the same between server and clients

usually aren't

that is not a PlayerName

[sharp hound]

@winged badger It works, I used the console command SetName to set the Playerstate's Playername

Thanks for the suggestion

[winged badger]

if you get 2 players selecting the same name

that will crash

[empty dove]

This is a photo from UE4 Networking Compendium. It is depicted that GameState and PlayerState are shared across all the players. Does this mean that If I change a variable in PlayerState class on Server, it will be replicated to all other clients?

[chrome bay]

It does

[winged badger]

provided the variable itself is replicated

also

[chrome bay]

^ and is not marked with any conditionals stopping it being sent to players other than the owner

🥷

[winged badger]

not on PlayerState class but on PlayerState instance

[empty dove]

Thanks

[oblique inlet]

So I've added a replicated variable using

    UPROPERTY(Replicated, Transient)
    bool bIsSliding;```
I've put it in
```cpp
void AShooterCharacter::GetLifetimeReplicatedProps(TArray< FLifetimeProperty >& OutLifetimeProps) const
{
    Super::GetLifetimeReplicatedProps(OutLifetimeProps);

    DOREPLIFETIME(AShooterCharacter, bIsSliding);
}```
but  Server slide never prints
```cpp
    if (HasAuthority() && bIsSliding)
        GEngine->AddOnScreenDebugMessage(-1, 15.0f, FColor::Yellow, TEXT("Server slide!"));
    else if (!HasAuthority() && bIsSliding)
        GEngine->AddOnScreenDebugMessage(-1, 15.0f, FColor::Yellow, TEXT("Client slide!"));```
and I'm setting it on the client

[empty axle]

Because you are setting it on the client. Replication only works one way from server to all clients

[oblique inlet]

so what should I do?

just send an RPC changing it?

[empty axle]

yes

[oblique inlet]

ok

[knotty veldt]

if bIsSliding is going to affect your character movement you'll want to handle the replication in the character movement component instead of an RPC for better move prediction / less corrections

[eternal canyon]

Well yes tho that data is sent through rpc

But it does some other stuff beside the rpc

[hallow fiber]

What's the difference between regular DOREPLIFETIME and DOREPLIFETIME_FAST? Is it just faster?

[eternal canyon]

pretty surew the fast is using a push model

but i might be wrong

[hallow fiber]

Yeah, I am seeing that in params

What is that

GAS source code uses DOREPLIFETIME_WITH_PARAMS_FAST exclusively it seems

And I can't find any documentation on it

[fossil spoke]

If you look at the Macros themselves, the FAST version avoids a Property lookup, FAST seems to just assume that the property your replicating is correct and valid to a certain extent.

[hallow fiber]

Okay, so it does not actually like somehow speed up how fast the variable gets replicated or anything, just a slight optimization?

[fossil spoke]

Yeah

[hallow fiber]

Okay, I am going to just use the standard DOREPLIFETIME cuz it's giving me red squigglies despite it working and I don't like that

[fossil spoke]

Its just saving the CPU some time i guess by trusting the programmer got their shit right.

[hallow fiber]

Yeah, I thought fast would just somehow actually make it replicate faster and that would've been awesome but too good to be true

[fossil spoke]

DOREPLIFETIME is just a wrapper for the non FAST version

So basically its a default DOREPLIFETIME_WITH_PARAMS

[meager spade]

ignore the squiggles 😛

i do, don't bother me in the slightest

[hallow fiber]

I do not like red squigglies

Means code doesn't work obviously

[fossil spoke]

Red Squiggles is 99% of the time Intellisense not knowing whats going on.

Causing a false positive.

[hallow fiber]

It compiles fine, just red squiggles remain...

[dull lance]

get R#/Vax/Rider

[fossil spoke]

Exactly what i just explained above

[hallow fiber]

I know

I am using Rider

[fossil spoke]

Rider for Unreal?

Or just regular Rider?

[meager spade]

🤔

[dull lance]

does regular Rider even compile Unreal?

[fossil spoke]

🤷‍♂️

Id just assume Rider for Unreal would not produce red squiggles

[meager spade]

it does

[dull lance]

it does for some things

but it's kinda rare

[meager spade]

there is a fix for it planned

mainly on the push model stuff, and the DOREP_Fast

[fossil spoke]

I use VS and VAX so I dont have to deal with any of that shit.

lol

[meager spade]

http://thegames.dev/snaps/rider64_Q8MwVKxFaS.png

you just deal with it tho 😛

[dull lance]

for instance, this inside PreReplication makes a red squiggle, but it compiles ```cpp

DOREPLIFETIME_ACTIVE_OVERRIDE_FAST(AMyClass, CarryingPlayer, ItemState == ItemStates::Carried);```

[hallow fiber]

NOOO, Hate red squiggles

[meager spade]

then turn off Resharper, and just code without it 😛

[dull lance]

use VS Code

[hallow fiber]

I cannot do that

I am bad at coding

[meager spade]

then don't complain about a silly red squiggle. If the code compiles, its fine.

(normally)

[knotty veldt]

Yeah that’s my point. It’s part of the saved moves for replaying and correcting etc. btw I saw you authored a networked movement plug-in but it doesn’t seem to be available on the store anymore?

[eternal canyon]

I haven’t updated my payment method yet and am working on a second version

Tho would prefer not to talk abt it too much here as that could be self promotion etc

[vivid seal]

still trying to figure out how abilitytasks for root motion work (so i can make my own, hopefully simpler, version since im not using GAS). do root motion tasks need to be replicated to all clients? Right now i'm running root motion predictively on the owning client, then on the server after confirmation, but not on remote clients. I haven't tried anything crazy but it looks alright. For something that's server-initiated (knockback), would I just run it on the server, or would i replicate it to everyone?

[twin juniper]

Guys, does anyone know how can i simply

GetOnlineSubsystem() // or something like that

Am i missing something in the API? I'm just trying to access the OnlineSubsystem in order to tell it to Destroy the session

[hallow fiber]

Unrelated but I am also trying to make my own version of GAS

[winged badger]

IOnlineSubsystem* OnlineSub = IOnlineSubsystem::Get();

[vivid seal]

the more i work on it, the more i start stealing ideas/functionality from GAS anyway, but its helpful to build it myself from a learning perspective. movement has really been the worst part though, dealing with CMC prediction and root motion sources and trying to tie that into the ability system i made

[winged badger]

you are using gameplay task component to run those, yes?

[vivid seal]

no, i'm basically creating something similar to ability tasks but not actually using the gameplaytask class, currently just a UObject that controls applying/removing the source after a certain amount of time. mostly trying to figure out if every machine needs this handler object or just the predicting client and the server

[knotty veldt]

Ah ok. Are you using the new (4.26+) containers for extended move flags etc? Was looking for an example of it as it’s not well documented

[twin juniper]

I'm trying to access it from GameInstance, because i want to handle Network failures and stuff like that. Problem i have right now is that upon host leaving the game... all the clients are like "hey we are already in a session, therefore we can't join a new one or host"

[twin juniper]

I will try this though

[winged badger]

@vivid seal its not part of GAS

and it runs the root motion pretty much out of the box

[vivid seal]

if he's the guy that made "Smooth Networked Movement," yes, it does use 4.26 CharacterNetworkMoveData in that plugin

[dull lance]

are you using Steam / EGS ?

Actually Game Instance does have a function for Network Failures

[twin juniper]

SubSystem=null for lan testing

[dull lance]

just go from there

[vivid seal]

I briefly looked at the source for this, but i'll check more in depth. Do you know off the top of your head if it runs root motion individually on every client? this seems more of a CMC concern (whether the server replicates root motion to remote clients smoothly or whether they need to run it themselves).

[twin juniper]

I'm trying to recreate warcraft 3 lan lobby 😄

[winged badger]

Kaos was doing that bit, so not off the top of my head

[vivid seal]

yeah he mentioned the other day he had root motion sources working without GAS, but i wasnt sure exactly how he structured it

[winged badger]

he had it working in 2 hours time

[vivid seal]

it seems like one of those things where if you know the answers to a few questions and you already have CMC extended its not too much work to implement, i just want to make sure im doing stuff correctly

[twin juniper]

    UFUNCTION()
        void HandleNetworkFailure(UWorld* World, UNetDriver* NetDriver, ENetworkFailure::Type FailureType, const FString& ErrorString);

I have borrowed the code from AnswerHub, and i have connected it with this in the constructor.

GetEngine()->OnNetworkFailure().AddUObject(this, &UWorldGameInstance::HandleNetworkFailure);

[winged badger]

just don't do what one of my juniors did

handled network error on server by exiting to main menu (with listen servers)

[dull lance]

Eh, isn't it just easier to just implement the BIE at the GameInstance Level ?

[twin juniper]

I'm listening

[dull lance]

and just based on the network fail type, handle it

[winged badger]

result: anyone disconnects, and server goes to main menu, then everyone disconnects

[dull lance]

Eh the way we do it is that we detect who disconnected, and then act based on that

[twin juniper]

Yeah, that is totally correct. When host disconnects, everyone goes back to mainmenu. And is unable to join new or host a new session because one already exists. So i'm just trying to destroy it

BUT

[dull lance]

And since we're using Steam, we can handle other people's connection that way

[twin juniper]

When you leave (as the client) your session gets destroyed

I just have the problem when host closes the game :/

[winged badger]

there is no harm in trying to destroy a session if you're not in one

i find it convenient to have DestroySession call on BeginPlay of MainMenu

[dull lance]

Also, there's no harm in destroying your local session if you're not the host

[twin juniper]

Oh my god, that is like the mother of all solutions... my brain is just not working at 4:50am

Thank you so much guys ❤️

Yup... this works like a charm, no more headache 😄

I also have one more question. How in the world would you transfer a save file? Just with RPC call ? Is there a limit for the save file size?

Or do i need to divide it in chunks?

[winged badger]

there is a limit, think default is 40kB for payload

but its configurable

and i would RPC it to server from the PlayerState after it finishes its PostNetInit (if it has a local controller a.k.a. GetOwner() from PS scope)

note that in case of lobby and game level not being the same level, that RPC would had happened in the lobby, and would just get transferred to game level via seamless travel / copyproperties

[twin juniper]

Interesting, so if i for example add 2 ints to my save file. Like "CurrentChunk", "TotalChunks" and make it the first payload that is recieved, i can chain them till i get to the end. Or if by any chance someone gets disconnected while transfering a bigger save file?

My idea was that once the save file is transfered, everyone would simply regenerate the world when the game starts

[winged badger]

for that you just need a seed for a random stream

ideally

unless players can modify the level and that gets saved as well

[twin juniper]

Oh yeah, seeds would be amazing for procedural. But since it's my first time doing a multiplayer project. I'm trying to make it simple with a static map.

Yet... i need to save stuff like items, talents, spells

[winged badger]

that is not part of the level though

part of the map*

you need a struct with which you can fully instantiate the player

[twin juniper]

Yeah, you are right, but since the default start map is always the same, with the characters and stuff... i wanted to regenerate the characters based on equiped items for example

Alright i got it, thank you again for your time 🙂

[winged badger]

it can be saved as json or binary

via engine functions

[twin juniper]

So i wont even hit that 40kb mark for a single payload, perfect

[winged badger]

and it makes the RPCs simpler

unlikely, my characters are rough equivalent of a MOBA

and the setups are 3kB when in .json format, and just a fraction of that when inside an actual struct

[twin juniper]

That is a huge relief

[winged badger]

for example, they have equipment, of sorts

i don't save the stats for the gear, just the Rowname of the DataTable row that holds the data for it

[twin juniper]

So all the things like inventory with item IDs... it should be simply nothing

[winged badger]

and where its equipped, Slot, Index

[twin juniper]

This is going to be so much fun, i love indie dev. This community ROCKS

[steady iron]

how to make p2p games using eos for mobile

[bitter oriole]

Unreal doesn't support P2P, it only does listen servers which aren't great for mobile

EOS is essentially a matchmaking service so it's irrelevant (doesn't handle multiplayer)

[steady iron]

https://dev.epicgames.com/docs/services/en-US/GameServices/P2P/index.html

so this is currently not working? or is it just not usable for unreal engine?

[bitter oriole]

It probably is working, and is also not used by Unreal, which does not support P2P

[woeful ferry]

Saving for characters for multiplayer, what are you guys using?

Currently we're using a object that creates once you save for all players, if a new player joins it checks if there's a save object for that pawn and assign all the saved info to that character.

But the issue is it's not that scalable I've figured out now

[chrome bay]

save it client-side to the users local prefs, send it to the server when they join

Assuming this is data the client can store anyway

If you're talking about global data that clients shouldn't modify, you're looking at a data server solution or something

[winged badger]

i find that RPC from PlayerStates PostNetInit (if the PS is that of local player) works best

[woeful ferry]

It's not an issue, it's a co-op experience. 😄

[chrome bay]

But if it's just stuff like "I have this hat equipped" then probs client is the best way

that's how we do our cosmetics for e.g.

server just validates their choices

[woeful ferry]

You have that in the cloud?

[winged badger]

which is a non issue if you have a lobby

[chrome bay]

noop

[winged badger]

as you can just RPC data while in a lobby and transfer it via seamless travel through PS

[woeful ferry]

So if you format your computer, you'll lose your cosmetics?

[chrome bay]

Well you lose your choices, not access to them

Whether you have access is either a DLC key on Steam or tied to your steam stats

Which obvs we don't have to worry about cus that's steam

[woeful ferry]

We have a survival experience, think Subnautica, Valheim et.c. So clients will lose their items and so on

Probably have to keep that in the steam cloud save

[chrome bay]

yeah that's fine

[winged badger]

i hate steam cloud

[chrome bay]

Cloud saves on Steam in UE4 is basically a check box

[winged badger]

consider the following scenario

player starts playing on friday and plays through the weekend

then slacker that he is, continues playing on his work computer from work the next day

only the work computer doesn't allow steam client to write into say, AppData

so it tries to fetch a cloud save, fails, and creates a new one

[chrome bay]

Oh yeah, in that instance it doesn't work 😄

[winged badger]

which is the main profile file

then he figures cloud doesn't work fine, continues from home

but now the new profile he made and that cloud was still able to read and pull

had the newer date then the one from weekend

[chrome bay]

The way I setup cloud in the past was just asked Steam to backup the contents of appdata/mygame/saved

So if you can't write to appdata, nothing gets saved

[winged badger]

so it overwrites his weekend profile

at home

[woeful ferry]

Makes sense, I can probably do something like you said

[woeful ferry]

this

[winged badger]

then you get "OMG I LOST THE SAVES, WTF !?"

because the player is basically computer illiterate

[chrome bay]

Me:

😄

[winged badger]

i just added a backup that is not cloud synced

was still fairly annoyed

[chrome bay]

tbh my only real problem with steam cloud is that it seems to be totally impossible to actually delete the cloud data

Trying to test a packaged game that already had a cloud save for my account as if it was a fresh account was a pain

Just kept restoring the cloud data

[winged badger]

we have 2 game IDs, one strictly for itnernal use

[woeful ferry]

I'm gonna ask our publisher what they're doing with their own games too, but I'm pretty sure it's something along the lines of what you guys describe

[chrome bay]

I mean storing per-player save objects server side definitely isn't the solution

[woeful ferry]

No, I figured

😂

[winged badger]

for starters you need half a dozen servers

running till judgement day

[chrome bay]

You either want some kind of global data server that stores the user data, or you keep it local / confined to the user data of OSS you're usin

I do wonder how many games would be totally unplayable forever if Valve closed their doors tomorrow

I think a lot of us are dependant on that not happening 😄

[winged badger]

we'd need 2 days to fix the OSS

then it would be fine

[chrome bay]

I'd be job hunting 😄

[woeful ferry]

Hmmm, so when a player joins does it send each saved property to the server? It can be a quite heavy operation

[winged badger]

one struct

[chrome bay]

Depends what it is really too

[winged badger]

from which you can completely instantiate a player

[woeful ferry]

Yea, my save file is one struct

[winged badger]

its easy to (de)serialize as well

yeah, you put that struct as RPC parameter

[chrome bay]

unless it's megabytes a one-off packet is ok

[winged badger]

and off it goes

but generally, player setup fits into 300 bytes

[woeful ferry]

save file goes:

https://tenor.com/view/cheerio-hat-tip-gif-10803496

I get it now, I'll try it out

[chrome bay]

You can help yourself out too ofc. Like for our cosmetic choices, we don't send asset names or anything, it's just an FName that get's looked up in a data table that both server+client have

If it's static data you can key with something that helps

[winged badger]

we use tags that also happen to be matching the datatable rowname

[chrome bay]

dat sweet gameplay tag net serialization

[woeful ferry]

Yea, we just have inventory, character stats (health et.c), gear, stamina

[winged badger]

exactly

[chrome bay]

@winged badger how many tags are you up to now :D?

Would be nice if we could do a data table customisation that used tags for row keys tbh

[winged badger]

nearing 3000

[chrome bay]

oof

So by my logic that's..

12 bits for a tag

With enough headroom for another 1,000 or so before you need another bit 😄

[winged badger]

it shouldn't be too difficult to make

would just need to replace that one slate element

[chrome bay]

I'll settle for multi-row editing tbh

[winged badger]

i'd go custom DT for that tho

[chrome bay]

yeah

[winged badger]

and put an actual tag there

i had to increase the tag container max size to 128

[chrome bay]

Still can't believe that's a thing

Was also surprised to find that adding one tag sends the whole container.. which is just upsetting

You'd think they'd have implemented some bespoke delta serialization for tag containers

[winged badger]

but they did go and save that one bit on the tag container num

[chrome bay]

oof

[winged badger]

thats important

[chrome bay]

10/10 Epic

[winged badger]

find that odd to say the least

considering most games don't have a bandwidth problem, but are happily choking the server CPU

[chrome bay]

yeah, really bizarre

[winged badger]

to go and complicate stuff for 1 bit per tag container

[chrome bay]

I guess though they only really replicate FGameplayTagCountContainer in GAS, maybe they never planned for anything else

Might be wrong about that actually

[winged badger]

counter is way too complicated for simple use/replication

especially for stuff like COND_InitialOnly, which happens a far bit with tag containers

[meager spade]

when we switched from normal container to count in our custom system

we had issues where multiple tags got added, but the same amount was not removed

was.. fun 😛

player getting randomly frozen in place, etc urgh

[kindred widget]

Earlier conversation does remind me. I was messing around with some RPC testing once and noticed that RPCs are dropped near getting over 65,535 bytes. Is that hard coded, or is that a project setting?

I assume hard coded due to some networking hardware limitation. Just curious about it. Seemed odd that the limit of size matched a uint16 integer size in bytes.

[golden nest]

Hi, is there any way to use "OpenLevel" with servertravel?

What i'm trying to achieve is to have the "Completed" node within server travel

For loading screen porpouse

[empty axle]

There are two settings for that MaxRepArrayMemory and MaxRepArraySize

They are deprecated in 4.26 though, not sure what they use right now

[kindred widget]

Huh. I think my testing was in 4.25. Didn't know about those then. 😄

[bitter swift]

I'm trying to join myself through 2 standalones. What am I doing wrong?🤔

I open the level first and then open my local ip address on the other client.

This is the output i got

[shy copper]

can someone direct me to the right way. I'm looking to replicate the Jump from the server to the other clients, What needs to be changed on the MovementComponent? I see the state it's being stored in the FSavedMove_Character but it's not sent to other players unlike the rest of the movement events.

[kindred widget]

I thought Jump was automatically replicated?

[shy copper]

Me too... but it seems it's not?

Only client to server, but not other clients

thought it was my project, but I've just tried with the thirdperson example

only executed on the server

[thin stratus]

Jump is not replicated to Simulated clients

You will need to fire an RPC there

And filter server and owning client

[shy copper]

Yeah, i've checked this is quite annoying right now, because i was testing yesterday a build and it was working apparently? i even have a gif of the movement lol

[thin stratus]

Well you are jumping

But the simulated code has no concept of jumping

It just applies the velocity

So no callbacks are called

You don't even know if velocity is a jump or not as a simulated client

@shy copper

[shy copper]

I just checked the gif again and realized it was a buggy animation 😥

So is there a way to send a multicast event but ignore the owning client? 🤔

[chrome bay]

there is not

You can choose to ignore it client-side, but it'll always be sent

[dark edge]

Did you open level as listen?

[hexed pewter]

I have a question regarding hit registration in multiplayer scenario, with 2 clients (client A, client B). Assume its a FPS game with guns firing projectiles slow enough that player may attempt to dodge them (think something like alt-fire shock rifle from unreal tournament), if the distance between clients is not too close.

My understanding so far is this:

1. Client A calls SERVER_FIRE RPC locally to fire a projectile at client B;
   simulation projectile is being spawned locally;
   then Client A (locally) simulates all the necessary things like sound of gun firing, various animations;
   and finally projectile collision animation, either a blood splatter when it hit player or explosion when it missed;

2. Server determines if the fire action is valid, and then if appropriate, proceeds to fire on the server;
   projectile is being spawned (it can either hit or miss, the outcome is not neccesarily bound to be the same on client and server)
   some ON_REP function tells other clients that they should play appropriate animations and effects;

3. Client B first notices that a projectile is being spawned;
   ...

In this situation, will player B have more time to dodge, depending on how good his connection quality is?
The worse his connection, the later will he notice projectile being spawned?
Similarly how do games tackle following:
Client A has bad connection issues, fire a projectile and scores a hit locally;
but in fact misses miserably on the server (in the end no hit is being registered).

[chrome bay]

You need to implement lag compensation. Server will store a history of transforms for each player and timestamp them. Hit registration takes place client-side (shooters POV). When they think they shot something, they tell the Server, and the server validates the hit by checking whether the hit player was where the shooter says they were (rewinding by the RTT of the shooter)

Don't forget each client sees every other client back in time by a factor of their own ping, the server processing time + the victims ping.

All of these things can vary so you have to build in tolerances

Non-shooters may also want to fast-forward other players' projectiles by RTT / 2 so they are closer to the Servers' current position. However that also means they might think the projectile missed them when in fact it didn't, since on the Server, their pawn is actually behind by RTT / 2 + processing time.

[bitter swift]

I found out how to do that in blueprints, but not through console

[hexed pewter]

I was thinking about this just now 😄

[chrome bay]

fast-forwarding by RTT / 2 would give you where it currently is on the server (roughly) - RTT would give you where it currently is in relation to you on the Server

So it's a trade off

perfect sync (sadly) isn't possible. Whichever choice you make also affects how you see projectiles hitting other players

I.e. projectile might fly past another player on your screen since they're all in different timesteps, but it might hit on theirs

But usually unless it's your own shot, player doesn't care or cry BS 😄

[hexed pewter]

Do you happen to know if ShooterGame examples does this?

[chrome bay]

nah it doesn't

ShooterGame just does client-side hit reg for hitscan weapons, and server-side for projectile weapons

UT does it to some extent, but UT's system is also really tightly integrated with the weapons and the character movement so I don't like it much

[hexed pewter]

Does that mean if I were to build a simple project, server side hit registration isn't necessarily that bad right?

[chrome bay]

Probably fine as a basic starting point but not for anything competitive or PVP

[bronze jasper]

Hi,

could someone help me with actor components (in a player character class)?
They contain replicated stuff like movement, peeking, flashlight etc. because I don't want a huge monolithic player character class.

I create them in the actor's BeginPlay with NewComponent.
I don't use CreateDefaultSubobject in the constructor because if I change them later it messes up child blueprints, at least this is my experience.

The problem is, whenever the client tries to use these actor components, it gets disconnected with this error:
Client attempted to create sub-object.

If I'm correct this means that the server doesn't have that component and this should never happen. So basically there is one component instance on the server and one on the client but the engine doesn't think they are the same. (?) Or the server just ignores NewObject and all of them are just null on the server?

All of these components marked as replicated and stored in a UPROPERTY. If I create them only on the server they are not present on the client.
I've read on some forum thread that I should create them in a multicast RPC and I thought it may solve my problem (but doesn't seem logical because I think it's basically the same as calling BeginPlay on every client).
I tried calling this multicast RPC on the server but the method only runs on the server but not on the owning client (I can't figure out why, the actor is replicated).

Basically all I want is to create actor components that have replicated functionality (properties and methods too). I want the same as if I were using an actor but with actor components.

I'm not a beginner so if you could give me some tips I'm sure I can figure this out.
I'm surely missing something basic, I would be really grateful for some tips or any documentation where I can learn about how actor component replication works.

[chrome quest]

First off, the corruption in the child blueprints.
Are you by any chance hotreloading? i.e Compiling in the editor or compiling in your IDE while the editor is still open.

Also, marking the components as replicated and creating them on the server should work fine. I think?

[bronze jasper]

Hot reloading doesn't matter in this scenario because I tried building and starting the editor afterwards, it was the same. With default objects some of my components weren't ticking for example and I tried everything. As soon as I started using NewObject they started to work as intended. I don't want to play this gamble so I really don't want to use CreateDefaultSubobject if I don't have to.

[eternal canyon]

Well if they are corrupted…

I don’t think just building will do anything

[bronze jasper]

I haven't changed any code just created them with NewObject and they were suddenly working fine. I think this might be some blueprint cache or magic stuff which I'm not interested in, I don't want to learn the behind the scenes of UE. I don't want monolithic 10k rows classes because they are hard to manage and disgusting. Also I don't want to use actors for basic stuff. My question is how can I make an actor component that is present on both the server and the client and can call RPCs and have replicated properties? If it's even possible.

[chrome quest]

No, I'm not saying hotreload is the issue. I'm just saying that the corrupt blueprints could be from that.

[dark edge]

Just back up to a version that worked. And if your answer is, you're not using version control, then consider this a lesson learned LOL

[bronze jasper]

I’m using git, as I said I’m not a beginner. The problem is it never worked. I shorten my question, maybe someone knows the answer: can I use actor components for replicated stuff and if I can, could you explain how actor component replication works? Not the properties but the component itself.

[chrome quest]

After marking the component UPROPERTY as replicated do you also set them to replicate after construction?
SetReplicates() or something similar. It's not enough to mark them as replicated in your actor class

[kindred widget]

If you mark the component replicated, and it's created by a replicating actor, the component itself will replicate. Past that it's largely identical to Actor replication.

[bronze jasper]

Yup, I call SetReplicates(true) after I created them.

The client only disconnects when I call an RPC in these components, I try to dig deeper right now.

[kindred widget]

I don't think you need to do anything besides set SetIsReplicatedByDefault(true); in the component class constructor, then do NewObject, and RegisterComponent? Not as familiar with runtime component creation.

[bronze jasper]

Like this?

[kindred widget]

Dunno. My only known working example uses the class constructor on the component to set replication. But I assume that should work.

[bronze jasper]

SetIsReplicatedByDefault(true); in the component construct makes no difference 😦

[kindred widget]

What is This in this case?

And this code is running serverside?

[bronze jasper]

this = the owner actor, and this is currently in the actor's BeginPlay

if I use HasAuthority() the components are not created on the client, this is my problem. If I create them on the client too, it disconnects, if I create them only on the server, the client doesn't have them.

[kindred widget]

Odd.

[chrome quest]

Usually you'd create on the server and let the client receive the replicated version. It's quite weird what you're getting.

[bronze jasper]

Yup, this is why I'm clueless.

[kindred widget]

Are you sure this might not be a test fail? How are you checking their validity on clients?

[bronze jasper]

It's pretty easy, you can't move if you don't have the movement ability. 🙂

[chrome quest]

Have you tried a simple is valid to check the validity on both client and server.

[kindred widget]

Personally, I'd just create a print in the Component's Tick. See if it ever prints on clients. If it does, you have an issue somewhere else.

[bronze jasper]

Only ticks on server. But this is weird:

BeginPlay runs 1x on server and 2x on client (?) WTF?

[dusky yoke]

Hey guys. I'm trying to add a directional combat system, and to do that I compare two floats from eachother and get the Up, Down, Right and Left direction that the mouse is inputting. I've set the input to be a replicated float variable representing the mouse input. Depending on what direction I drag the mouse to, I run an animation montage with a Multicast.

However, the animation does not replicate to other clients. If I remove the directional stuff the animation plays. Any takes? 🙂

[bronze jasper]

"BeginPlay runs 1x on server and 2x on client (?) WTF?" -> never mind, one is for the server character, one is for the client

[bronze jasper]

Multicast? Why don't just replicate the float and let the client handle what animation to play?

[dusky yoke]

Here's the graph showing the setup for those interested: https://gyazo.com/278b510d6e252990be455c7f8d0afa49
https://gyazo.com/17d0239ec61af47d90d326f8ce3ce0f3
https://gyazo.com/b5cfa08f5ec3df9334c1ea7736a1d969

[dusky yoke]

Hmm, I'm not entirely sure how to do that as I've been following a tutorial setting this up (the directional stuff is added to it though), and he used a Multicast. He did say his setup was kind of wonky, but it initially worked for me. I weirdly understood his way of setting it up aswell, but I guess its wrong usage

[bronze jasper]

Oh I see. Do you call the multicast on the server?

If the client attacks, you have to tell the server first that the client wants to attack, and then call the multicast on the server.

[dusky yoke]

Yeah I call the Multicast on the server

https://gyazo.com/e26cdea4bb9964cf1d72360295fbed9b unless I've misunderstood the setup, this should be doing exactly that 🙂

Now the strange thing is that the animations run just fine if I skip the directional variable jumbowumbo and just run an animation. The variables are replicated, so not sure what else should be done in regard to that 🙂

[bronze jasper]

You have to send the values to the server

Just create an input for the server call and send the float with it

And store the float on the server so it can replicate it to the clients

[dusky yoke]

An input for the server call? Sorry, completely new to network-coding 🙂

[bronze jasper]

Your float is 0 on the server

So your function doesn’t do anything (the action based on movement thing)

I mean an input for that function, a float input

Like this.

[dusky yoke]

Hmm, okay that makes sense! I've got a question in regards to that though.
I'm setting the Mouse variable here: https://gyazo.com/346dc6ff2c738923eea275a3fbaa4e0e

Not sure if I used your suggestion correctly here though, but I'm setting that variable here on the servercall https://gyazo.com/1a93808e02ca59213d1f6cea09f5309f but no effect. I guess I fail to understand how the Server is actually being fed that information 😅 Thanks for all your inputs so far, feel like that was enough to teach me some things already haha

[bronze jasper]

Do you see the prints on the screen? The "Down", "Up" etc.

[dusky yoke]

Yeah as the client calling it

[bronze jasper]

So they are there on the client but not on the server?

[dusky yoke]

Actually both clients see the print

[eternal canyon]

This won’t work

Inputs only run on the local machine

[meager spade]

how do i change the ALobbyBeaconState to my custom one?

[gentle pagoda]

LogNet: Error: UEngine::BroadcastNetworkFailure: FailureType = FailureReceived, ErrorString = Host closed the connection., Driver = GameNetDriver IpNetDriver_28

I am facing this issue. please help

I am new to unreal its my first multiplayer game.

[thin stratus]

#online-subsystems has some pinned stuff about beacons

[gentle pagoda]

Can anyone please help?

[dusky yoke]

Hmm, do you have any suggestions as to how I can collect the variable on the server? 🤔

[dusky yoke]

Im thinking maybe I shouldve done all of that variable stuff on the client, and then just set bools depending on which comøarefloat is correct, and then just check that bool as the server? 🤔

[violet sentinel]

by using custom ALobbyBeaconHost and setting LobbyStateClass in ctor

[dawn shore]

Does anyone know how to let RepNotify for bool variable work on initialization?

Details: I have bool:bVREnabled, which is replicated and has a RepNotify function. If it is changed, RepNotify exists to do some stuff on clients, such as calling EnableHMD. A client can call ServerRPC to send a requent to change the value.
The problem is on the initialization. If I initialize it with false on BeginPlay, RepNotify wouldn't be called on clients because the default value is false.

[kindred widget]

Why not just call the function anyway on beginplay?

[dawn shore]

Oh I didn't notice that way.

I can call the RepNotify function on clients if the value is the same, but the time delay might be issues.

Does it take some time for clients to get notify from server, right?

[kindred widget]

Usually. Network travel time at least plus usual server tick time. Can sometimes be up to a full half second in bad situations.

[dawn shore]

Then that might make another issues because on RepNotify i do a lot of stuff.

Is there other solution for this?

[kindred widget]

It usually doesn't matter. Your replication state should take into consideration all of the other state that it relies on. For instance, if you have three different states, and these all do a ton of things, it should matter if it's called three times once per state. Specially if this is initial setup, you can hide it behind some camera work or a loading screen.

I'm curious though. If this is a client set value, why does it matter so much? If it's client authoritive, the client should set it and call necessary functions after sending it to server. The Replication should never come back to client since it should skip owner.

The only onreps that would need to happen would be on other machines than the owner, and if the state is set to true, then it can change them, if it's false, then that should be their default state on initial setup.

[dawn shore]

I quickly checked my codes, but maybe that doesn't matter.

so I will try that way until i find issues

thanks, man

By the way, I found something called ELifetimeRepNotifyCondition::REPNOTIFY_Always. Do you know if this is something useful for this situation? just curious.

[kindred widget]

Could work. Though on that note if you're running 4.26 or more, it might be worth considering a pushmodel system that you can just mark dirty.

More deliberate.

[dawn shore]

What is that system?

[kindred widget]

You can check it out in the native PlayerState.

Pretty easy system. You specify the variable the same way.

Call a slightly different macro in GetLifetimeReplicatedProps.

Then when you set it, you also mark it dirty.

I'm semi sure that marking it dirty will send it to a client regardless of the value changing.

Curious, will test.

[dawn shore]

Does it skip all of the replicated variables, or just specified ones?

[kindred widget]

Skip?

[dawn shore]

it skips changes, right?

on sync

I meants, skip all of the changes or changes of specified variables only

[kindred widget]

Normal currently replication just checks the variable on tick basically. Little more complicated, but still. Pushmodel only checks the ones specifically marked dirty. Saves a lot on server ticks in some cases.

You can use the two together as well, it's not one or the other as far as I'm aware.

[dawn shore]

I see. That sounds good. I will take a look at it.

[dawn shore]

I noticed issues on the initialization thing. I am a bit confused, so please correct me if I am wrong.

If the value is not the same as default, doesn't matter. server changes it and rep notify is called on all clients

but if the same, all clients call RepNotify by themselves

but in the function, I have something I have to wait for at least one frame

I mean I use SetTimer in RepNotify to do some stuff after that

that might be an issue

Oh, it is not that the problem happens if the value is the same. it happens if the value is different.

clients which is not local call RepNotify and set timer, then a local client finds the value is different, and then call ServerRPC so server notify changes to other clients

[kindred widget]

Okay. Seems even with Pushmodel, the OnReps won't run without that condition set.

[dawn shore]

I will definitely learn that.

[kindred widget]

Hmm. Well that's.. odd. Even with that condition set to always it isn't running. :/

[dawn shore]

I didn't try REPNOTIFY_Always yet

just trying your initial answer, and noticed

I can still check value on the function which is passed to SetTimer, and if the value is different, then I can skip that.