multiplayer

[thin stratus]

Some peeps here already stated they are using it

[solar stirrup]

mayb

maybe that's why the replication feels off this season

It's all very short range heh

[twin juniper]

Guys, i have a question.
Can i rollback with replication?

And also, is my question even make sense?

[fossil spoke]

Rollback is a very broad term, you typically implement rollback on a per feature basis. Its not something that you just generically add to everything.

The Character Movement Component implements Rollback.

[true stream]

If I want my actors to be in sync when it comes to their positions, I should mark their location as replicated? or there is a different way

(RTS game, actors spawned from barracks)

[solar stirrup]

I just thought of something @thin stratus - wouldn't replicating a UDataAsset* be cheaper than replicating a FPrimaryAssetId or FName

The engine will assign an FNetGUID after the first time it sends it right?

So "expensive" first replication but then it'd just be 4 8 bytes it's uint64 now

[thin stratus]

Not entirely sure if it maps already stably named assets to guids

But it would make sense I guess

easy to test by breakpointing the packagemap

[solar stirrup]

defo gonna check

if so i'm saving myself tons of trouble heh

[thin stratus]

If it's just actors and we ignore the whole smoothing part, it's enough to mark them as ReplicateMovement in their settings

[true stream]

Ah, ok I guess by default its not on.

I noticed that I was causing some difference in performance for the client (half the framerate when on back apparently) and even though the units were getting killed in time, the movement was off.

[solar stirrup]

Seems so: seems like it actually has two caches, one for static (stable) objects and one for dynamic objects

/**
 *    Generate a new NetGUID for this object and assign it.
 */
FNetworkGUID FNetGUIDCache::AssignNewNetGUID_Server( UObject* Object )
{
    check( IsNetGUIDAuthority() );

    // Generate new NetGUID and assign it
    const int32 IsStatic = IsDynamicObject( Object ) ? 0 : 1;

    const FNetworkGUID NewNetGuid = FNetworkGUID::CreateFromIndex(++NetworkGuidIndex[IsStatic], IsStatic != 0);

so yeah i could literally make my life easier by just replicating the item asset

[twin juniper]

Oh, ok. I never made any rollback so i am keep getting nervous about the future. Because my prediction just never go wrong right now, as i only have simple attacks and inventory managing. Do you know good way to make prediction goes wrong so i can try implement rollback?

[magic vessel]

Trying to handle when the host drops in a game instance subsystem. Is there a way I can listen for when the host disconnects and can handle it on the client?

[thin stratus]

C++?

Epic strangely enough made a very specific decision to expose a callback for this to BP GameInstance 😅

But ultimately it's a (or rather two) core delegate callback iirc.

You can just bind to it in c++ where you want (more or less)

TravelFailure and NetworkFailure are the keywords iirc

Also keep in mind there is no HostMigration support in UE without altering the Engine. And I have yet to see someone actually do or even attempt this.

[magic vessel]

I can't find any delegates in c++ for either network or travel failure from the game instance

[magic vessel]

Yeah

I just want to get it so that it destroys the EOS session on all clients when it occurs

[true stream]

is there something like that but for replicating rotation?.

[lucid badger]

So if I use Data Assets to populate fields on an Object (say an item), when the server creates the Object, the data asset assignment is separate from the construction of the object. This means that the data asset has to replicate separately from the object itself, so you have to wait for it on the client before you can load in values.

But if you use a Child BP Class of your item Object, then when the server creates the Object, its class is an implicit part of what is created. Client recieves the object and always knows the class, so it has all the defined values of that BP Class. Instantly. No waiting for a second rep.

Is there ANY way to have Data Assets do that?

Short of literally having the child BP class just reference the data asset

or is Class just sort of privileged in that way

[thin stratus]

That should include rotation

[thin stratus]

It's not part of the GameInstance

Epic has 2 BP events in the GameInstance bound to it

Check the FCoreDelegates for example

Or try to find the BP ones and follow it backwards

[thin stratus]

Fwiw put a DestroySession call into the MainMenu GameMode BeginPlay

[magic vessel]

Perfect, that is exactly what I needed

[safe marsh]

hi, so I need to find the cleanest way to trigger an event in the HUD class of all connected clients when a new player joins, has to be done in BP, so I cannot set OnRep for the player array. this seems to be working but it feels bad to get controller by local index, is it correct?

playerstate beginplay

running this in the widget, and it seems to be working fine, but the player array var isnt marked as replicated, is that because its replicated in its base class?

I saw its also possible to use OnPostLogin in the game mode, but I still need to route it forward to all connected controllers

[flat halo]

hey folks, I am trying to implement Seamless ServerTravel in my game, and noticed that after enabling it, when I travel to the new map, it is spawning a new pawn and I endup with 2 player pawns. I havent changed the default spawning/possessing logic of gamemodes and player controllers.

do you know what I am missing?
should I change the default spawning logic to accomodate seamless travel? I havent found much online on how to properly integrate seamless server travel.

[fossil spoke]

All Pawns should get destroyed during Travel.

Unless you have done something to cause them to be retained

You should not end up with a duplicate after a Seamless Travel.

[flat halo]

I want to keep my original pawn, thats why I am integrating seamless travel.
for that, I am adding my pawn to AGameplayGameMode::GetSeamlessTravelActorList ActorList.

[fossil spoke]

If thats the case then of course you are going to have to manage default spawning of the Pawn differently.

You cant expect Unreal to understand that you need it to not do that just because you have retained a Pawn from a previous level.

[flat halo]

okay. Thank you.
I will look into it. If you know some functions I should check at the top of your head I would appreciate.

This is what I found on the wizardcell.

Pawn: Created by GameMode inside AGameModeBase::RestartPlayer(), called by AGameMode(Base)::HandleStartingNewPlayer(), called by either AGameMode(Base)::PostLogin() in case of hard travel, or AGameMode(Base)::HandleSeamlessTravelPlayer() in case of seamless travel.

[fossil spoke]

AGameModeBase::SpawnDefaultPawnFor is probably what you want to override, as you can easily then return your existing Pawn which would then get automatically possessed.

Or alternatively, just return nullptr from the function if you have a different possession mechanism.

Probably a good idea to look at AGameModeBase::SpawnDefaultPawnAtTransform as well.

[true stream]

Why the A before stuff

I thought it was for actor

But, everything carries it for what I see

Unimportant, just curious.

[fossil spoke]

@true stream Becuase they are derived from AActor class?

The GameMode is an Actor

You will see U infront of classes derived from UObject

UObject and AActor are the 2 main classes for Unreal.

That you use to make Objects and Actors from.

[true stream]

Is it?

[fossil spoke]

Yes?

[true stream]

I thought they have to had a visual representation

I remember reading that

[fossil spoke]

Not necessarily.

They dont HAVE to.

The PlayerController is an Actor, its not visual.

The Pawn is the visual for a PlayerController.

[true stream]

Ah ok well I learned something new then

[fossil spoke]

An Actor is simply an Object that exists within a World.

[true stream]

And it's a requirement for being networked right?

[fossil spoke]

Actors typically share the lifetime of the World.

UObjects do not

AActor is the only class that is default Networked.

[true stream]

Don't actors get destroyed ?

[fossil spoke]

Most do when the World is destroyed yes.

In the case of Seamless Travel, some are retained across the level transition.

[true stream]

Right I'm talking from a RTS point of view where rarely actors stay alive

[fossil spoke]

What do you mean?

[true stream]

Units get destroyed all the time

[fossil spoke]

Ok

Im not sure how that relates to what we were talking about?

If a Unit is an Actor and the Unit dies, yeah, it will be destroyed at some point.

[true stream]

Right, maybe I don't understand what sharing the lifetime of the world means

Because I'm not familiar with more than one level

[fossil spoke]

It means that at most, an Actor will live as long as the World is loaded

[true stream]

Got it, and objects won't ?

[fossil spoke]

If the World is unloaded, like during a level transition, all of the Actors that remain in that World will be destroyed.

Anything derived from UObject that isnt an AActor wont be tied to a World. Generally speaking.

Unless its a USceneComponent or UActorComponent

Those share the lifetime of the AActor they are attached to.

[true stream]

As well as any components attached right ?

[fossil spoke]

Thats literally what I said above.

USceneComponent and UActorComponent are the 2 types of overarching components

These are attached to Actors

Whether thats a SkeletalMesh Component or a MovementComponent

Whatever

They are all derived from either of those 2 types

[wintry crane]

guys in my custom gamemode i am trying to create widgets for 2 players once there are 2 players in the lobby i used multicast and then created the widget and it only creates 1 for the server but not for the client, why is that is it supposed to be like that?

[nocturne quail]

by default OnConstruction(const FTransform& Transform) called on server/client ? or just server?

[fossil spoke]

You cannot call RPCs in the GameMode

The GameMode only exists on the Server

So the RPC has no where to go.

[wintry crane]

damn it should have asked earlier would have saved some time, ig i will move my logic to player controller then.. actually whats the usual spot to call rpcs? i saw on yt people tend to to them in pawns but i guess its fine if i call it from player state or player controller right?

[fossil spoke]

An RPC requires a NetOwningConnection.

The PlayerController is the NetOwningConnection

So any Actor that has its Owner chain back to a PlayerController can call an RPC

Pawn and PlayerState are both owned by a PlayerController

So they can call RPCs

[wintry crane]

ohhh

thats good to know

so like the player controller is the big boss

[fossil spoke]

The Server can always call RPCs on replicated Actors as it has Authority.

The GameState for example

[wintry crane]

um also what about game state?

oh yea

[fossil spoke]

You can call RPCs on that from the Server

But not from a Client

Because the GameState isnt owned by a PlayerController

[wintry crane]

oh so i kinda can do the same logic as in ss but use game state instead

because game state exists on the server and the client..

right?

[fossil spoke]

It does yes.

But what are you trying to achieve?

It looks like you are trying to bring up a selection menu?

Of some kind?

[wintry crane]

i mean at the moment i am just trying to overall understand RPCs because i am lacking in this area but at the moment i am doing steam sessions and when there are 2 players in the session i am trying to display the same widget on both server client and the client

i mean my ultimate goal is to make something like

this where you can choose your character to play

[fossil spoke]

Sure. Im guessing this appears immediately?

[wintry crane]

huh?

[fossil spoke]

Do you want to bring up this Widget straight away for each Player

When they Join?

[wintry crane]

i mean if there is 1 player i have widget with a text awaiting player, and when second players find the session and joins it the same widget appears on both instances

[fossil spoke]

Ah ok, then sure, the GameState would be fine for that.

[wintry crane]

lets goo

i am really suprised how this text channel is so talkative

thanks for the answers man

[fossil spoke]

Well the server does have over 100k users

[fossil spoke]

No problem.

[mental crag]

Hey! Running into an issue with Steam Advanced Sessions. I used this video to set it up: https://www.youtube.com/watch?v=_U0BK0olC-I&list=PLNb7FZ2Nw2HTBgWggHGaMtHAOygKcXIyW&index=9

The server browser is not able to find the session half of the time. Sometime it appears, other times it doesn't. I've made sure that both of the computers are on the same project version and on different Steam accounts.

It's confusing because for the past 3 hours, it's has been working, and then 10 minutes ago, it stops working completely, making my development a stand-still. Does anyone have a solution for this issue?

[regal storm]

Hey folks. I'm replicating an actor's transform and wanted to try to debug the potential difference between the server and client(s) representation of this actor. Is there perhaps a way to view the bounds of and object on all clients/server at the same time (overlaid within one viewport/client)?

[stray snow]

Hello! Does anyone happen to know a workaround for Skip Assigning Gamepad to Player 1 not working? Been banging my head against a wall for a few days. I found this but it seems the functions have been changed, currently working on figuring these functions out with the new ones

[jade ibex]

well... if the server could tell where the client is, it wouldnt have a discrepency would it? you could display last server reported location on the clients though.

[regal storm]

Absolutely. The problem is that it's an object that is simulating physics, and so I wanted to be sure the clients weren't adding some kind of lag/offset to the transform that is received from the server every tick. I'll look into reporting the last server location, thanks!

[jade ibex]

do you know about server reconciliation?

if you read up on that, it would be helpful as well.

[dark edge]

That's built in

[jade ibex]

yeah, for the character movement component it does it for you

[dark edge]

I'm pretty sure for physics replication you can get something similar too

[jade ibex]

although you never know, he could be trying to implement his own solution for something else

[dark edge]

If not then just replicating a transform is enough.

[jade ibex]

not really

[regal storm]

Sorry, for context, it's a buoyancy calculation on the server

[jade ibex]

not if you want a smooth experience

[regal storm]

Which then gets sent as an actor transform to clients

[dark edge]

I'm mean to visualize

[dark edge]

Why not just use the built in physics replication?

[jade ibex]

does ue5 replicate buoyancy?

[dark edge]

It has quadratic smoothing etc

It will replicate any sort of physics, it doesn't care about how the physics got that way. Although I've never tried doing stuff JUST on server. All my physics stuff happens on both ends.

It's old, from ue4 days

[regal storm]

Hmm, I was under the (probably incorrect) assumption that physics replication was pretty dreadful in UE, and that it was getting a fairly large overhaul in the somewhat near future. Have I missed that update, or am I just completely misinformed?

[jade ibex]

from what ive seen and heard phys replication is solid

[regal storm]

But yeah, trying to avoid mismatch between client and server by just running it server side at this stage

[dark edge]

It's not bad as long as you don't need prediction

And you'll want to mess with the settings, the stock settings are very strict and result in corrections all the time.

[dark edge]

That's 100% mismatch unless you mean your waves aren't synced.

[regal storm]

Right now waves aren't synced, but the intention is to have ship buoyancy running server side (using whatever waves the server has access to), and replicating the transform of the ships directly. The main reason was to avoid any possible situation where the waves might fall out of sync and then the ship buoyancy calculations on the clients would fall apart from each other

Eventually it'd be that server waves gets synced to clients too of course

But that's just visually

[fast mason]

to whoever may be useful, adding a definition of DO_BLUEPRINT_GUARD=1, helps a lot to debug blueprint errors on shipping and test releases

our production server was on test release and we been having several days with a infinite loop in blueprint that kicked everybody..

without any kind of warning or message

log was right there, but server was without activity

so with the BLUEPRINT_GUARD we saw a beautiful LogScript: Warning: Runaway loop detected (over 1,000,000 iterations) - see log for stack trace

[shrewd carbon]

I was wondering if someone has any experience doing grid movement in multiplayer.. my initial thought was to use a timeline to move between the tiles, but this introduces some pretty glaring jitter on clients.

Open to other ways of doing this :C

[upbeat basin]

Do I need to create my own multicast delegate or OnRep variable in order to let clients know there is a player who enters or leaves the server or is there any prebuilt solution for this that I'm not aware?

[upbeat basin]

Or like overriding PlayerArray as a ReplicatedUsing Uproprerty instead of a Replicated one would be so much better

I guess I'll override the AGameStateBase::AddPlayerState and AGameStateBase::RemovePlayerState to call multicast RPC and broadcast the updated array to everyone with a custom multicast delegate? Please let me know if there is a better solution for this

[thorn musk]

Hi, when I test my game as the server my Player spawns with normal rotations, but when I test it as a client the rotations are wrong by 180°
Any Idea why?

[thin stratus]

Aloah, random assumption: Your Pawns use "ControlRotationYaw" and the spawning logic only sets the Actor/Pawns Rotation, which gets overridden by the local ControlRotation of the Client.

Try setting the ControlRotation to the same rotation as the Pawn you spawn. It's a property on the Controller you use to possess the Pawn

That's all given that you do this manually (the spawning code)

[shrewd carbon]

So following this up, it looks like the client and the server are fighting with each other, the client's set actor location is 0,0,0... im not sure why.. .

i turned off replication in the timeline and that prevents teh client 0,0,0 but theres still jitter in the player movement

[nova wasp]

is this a realtime game? are turns atomic things that can't be "between?"

it might be possible to only send over where they moved and why and to just represent that on their client

[shrewd carbon]

its kind of realtime. as im doing this im realizing i just need server to know their new tile position

when the player has arrived at the tile

or rather "start moving" and "arrived"

so that can be replicated to other players

[nova wasp]

if instant response times are not required you could just consider the current and previous

as is common in most physics replication etc between snapshots

this will add an inherent delay to visual feedback as there must be two states to consider before visuals change

but you may not need to care

but I think if it's always a set speed etc you might not need to go that far

if it's just "most recent square they are on"

[shrewd carbon]

it might end up being that

im wondering how i would structure that in this actor

just a vector2D of their current tile location?

[nova wasp]

why do tiles need to be stored as floats?

[shrewd carbon]

vector2DInt then i guess

just wanting to consoldate X+Y

[nova wasp]

I assume they are like a chessboard here and not that they just happen to move 1 meter in steps etc

[shrewd carbon]

you are correct, they is only tile step sizes

[nova wasp]

I suppose that should work but that might not be the only thing that needs to store a position, I guess

keep in mind there may be more kinds of things who care about being on a grid square

should be fine to stuff this on an actor for now, but prepare to need to reconsider this at some point

it could be easier to have them in a single manager or stored on something easier to share code with other parts

[shrewd carbon]

I suppose but the core issue still stands, on a more granular level, moving the actor without the jitters

[nova wasp]

you can't gaurantee packets coming in at a nice constant rate but you are in a a nice situation here I think, as the size of the packet will be extremely small

[shrewd carbon]

I guess rephrasing this

[nova wasp]

as for the visuals that depends on a few things

if there's a giant row of these things and they all move "forward" to a square

[shrewd carbon]

I want to send the "move to location" to all the clients and then have the clients to the interpolation locally so im not waiting on smooth packets from server

[nova wasp]

do they need to smoothly all move at once or is it okay if a few of them start moving a handful of frames or so later etc?

the clients can react to receiving the new position in an OnRep

and after that, consider the "visual" and "real" location

and move between that every update with the visual mesh

this does not consider the rules of the game, it purely lerps between their previous and next state on demand

if business logic depends on the visual move being a consisent speed you may need finer control over it and might have to get fancy with considering when the packet arrived and even what time it was "for"

[shrewd carbon]

Yea I figure i can...

Player hits button -> Ask server to change location -> Server changes the location -> location var replicated to all clients -> clients perform visual movement

[nova wasp]

this is kind of a rabbithole in some sense, but I think the naive linear setup should be okay

[shrewd carbon]

if the server says thats not possible the clients wont update their position

[nova wasp]

the "real" location could just be said grid location while the "visual" could be the visual component in world space etc

[shrewd carbon]

yea that'd be idea.

[nova wasp]

I am doing something similar for my weird interp setup but my situation is more realtime with full previous/current frames

(my case is a fixed 60fps tick with the main thread "rendering" the state, for everything and not a specific gameplay feature)

rotations can be interpolated with quaternion spherical interpolation (SLERP) fwiw

[shrewd carbon]

yea im just trying to get multiple characters jumping around a grid :C

[nova wasp]

also: please test your game with some network emulation to see what happens with bad network situations

just to get in front of bad situations early

[shrewd carbon]

lmao i cant even get this to go well locally

i appreciate the looking out though

[nova wasp]

FWIW the unreal network emulation presets are rather extreme but you never know with NA internet lol

[chrome bay]

• @solar stirrup it's because they replicate as blobs, so any change means resending both the struct type + all the data. It's not meant for efficiency really.

[solar stirrup]

Well that's a bummer

If it becomes an issue I'll see what I can do

Might modify net serialization of it if the data's type is guaranteed so it doesn't have to serialize that

The data is relatively small so i'm not worried

[rich crag]

Figured out my foliage spawning issue. it wasn't my replication, that was fine. I just didn't understand how the static mesh components worked inside the foliage actor.

[grizzled stirrup]

Regular structs don't work like this though right? If you had an FMyInventory that's a regular UStruct, and changed only one member in it, only that member would replicate?

[burnt wadi]

Hey guys I was curious, to store player data such as ranks and stuff should we use EOS or create our own database or something like that? what would be a "better" solution?
also if you can tell drawbacks of using one over another, thanks.

[solar stirrup]

Yeah they have delta changes

Only the modified props get replicated

Doesnt matter in my case I marked my item instances as Atomic and later just implement custom serialization, I dont want desync

[sudden dock]

I saw a video that reported that you can't make an online multiplayer game all in Blueprints because of some ping/lag/sync issues. Is that true?

[solar stirrup]

Depends on your game's requirements

[lost inlet]

Would be good to know what the video is and what it actually says in context

[sudden dock]

This is the video I watched: https://www.youtube.com/watch?v=YB_ew3j_HFw

[lost inlet]

so yeah this video actually provides adequate context

but you interpreted that as a blanket statement

it says standard RPC flow and property replication is fine in BP, but then moves onto custom CMC stuff

[solar stirrup]

Does Mover support blueprints

[lost inlet]

well it's experimental and this video predates that, but I think it's supposed to

[solar stirrup]

Else there's also GMC I guess since you can do custom blueprint movement with it, but a pricey plugin

Ay, guess vanilla unreal is finally gonna solve that problem

[lost inlet]

though I wouldn't want to lean on BP too much for networking, maybe basic things, but beyond that it becomes a bit of a nightmare for debugging

also GAS has prediction and you could implement a slide ability (example mentioned in video) as a gameplay ability, though GAS's prediction is fairly basic compared to CMC

[sudden dock]

I am really new to game development and right now I am building basic mechanics to learn but eventually I want to do a multiplayer game. Would something like a marketplace multiplayer template be something I should consider. My game would be a third person shooter and would have some custom animations but the core would be default UE animations. I don't need any crazy customization. I would probably have just the standard needs for a multiplayer game

[rich crag]

Question about arrays of structs... is there a way to match based on part of the struct or do i have to match the entire struct exactly? Problem is, i have a value that changes with a timer inside the entries in the struct, and i don't necessarily have a way to match the time for the item on Find.

[stoic wing]

Hello!
I'm trying to start a multiplayer pixel art game. within the player character i render the scene with a scene capture 2D component to a low resolution render target. i snap the scene capture component to a grid based of the render target resolution to make the camera movement pixel perfect. to make the camera movement smooth, i move the pixel perfect render in a widget with the world location of the scene capture component every tick (i know i know). this works fine in single player but in multiplayer it completely falls apart. characters are spawned in game mode, the widget in question is created in HUD BP.

do you think there is a way to make the widget work in multiplayer?

[silver pendant]

• I have this custom event **(RunOnServer) **on a class (replicates enabled) in the world

• I use the M key from my character as shown, but it doesn't fire on server from the client

• instead it only works from a server

• which is weird because (RunOnServer) is made to give the clients the ability to run events from the server, I really need help here.

[pastel escarp]

I have a function that gets called on all connected player controllers to demorec , when I play the replay, it works only on the player host, for the client, it spawns incorrect Player controller and incorrect spectator pawn

and thus, I am stuck at the middile of the map with no control

any idea what might be causing this ?

[twin juniper]

Hey guys, if the Owner is set to COND_SkipOwner, but the child have no COND, would the child replicates?

[twin juniper]

It worked on the client to server, as it print, wdym?

[silver pendant]

on the server, there is 3 prints, but when I try the client I only get the 2 that's already in the player cahracter before using the event

[lost inlet]

Well as a client you wouldn't know what's going on the server?

But the output log typically shows failed RPCs. Usually because the player controlling doesn't have ownership

Back to the reason I hate BP for significant networking tasks, debugability

[quasi tide]

https://portal.productboard.com/epicgames/1-unreal-engine-public-roadmap/c/1281-mover-2-0

while empowering non-engineers to craft their own movement.
This, to me, would imply they want it to be BP friendly

[solar stirrup]

nice

[deft onyx]

What kind of network method did you use on The Ascent?

I'll try to check on Alien Swarm and The Ascent soon. I'd really prefer to not limit clients' the movement range.

[silver pendant]

I have a question, can't I as the player run a (RunOnServer) event in another actor class in the world

I'm trying that but doesn't work

[dark parcel]

The client has to own that actor

and in general you don't want that as it opens more way for cheating

Most RPC calls can be made from what the player own.
Controller && The Character

You can read about ownership in the pinned section

[silver pendant]

thanks, I get it now

[dark parcel]

RPC gets dropped when you call it from an actor you don't own

[silver pendant]

so when I change the owner should that be replicated as well, or It's already is

[silver pendant]

it explains alot

[dark parcel]

if u want the actor to replicate set bReplicate to true

setting owner must be done by server too btw

[silver pendant]

ok

[dark parcel]

I mean practically you can do Server -> Set Owner of an Actor to Target Player. Then TargetPlayer-> Run RPC from that actor that is now owned by it.
but I won't recommend doing it that way

[thin stratus]

I can't recall tbh but I don't think we had a limit despite having to server travel together

[silver pendant]

after I set the owner it worked

[dark parcel]

Ye but I don't think it's a good practice to do that. Just from what I heard

[silver pendant]

I'm just testing my events, I didn't know that I have to be the owner

[dark parcel]

Yup but normally you don't need to go outside for RPC call for client machine. Route it via controller/character

maybe there is edge case like weapon, but I don't know. Haven't done much mp

[silver pendant]

about replication, do you know anything about reliable option
I read that It's for events that will do much tasks

[dark parcel]

It's better if you read the pinned article as I may give you wrong info.
But afaik Reliable means, that it's reliable and will reach client one way or another.
If for some reason Reliable RPC didn't reach client, it will get resend.

Of course it comes with overhead. You don't want to clutter your bandwith by spamming reliable RPC.
Something like setting rotation of character, deffinitly use unreliable

[deft onyx]

nevermind, I'm just going to run some tests then.

[rich crag]

would you use reliable or unreliable for events like respawning instanced tree meshes?

is it dependent on how much it matters that players have the same copies of trees?

lol

[silver pendant]

where is the pinned article again?

[dark parcel]

https://cedric-neukirchen.net/docs/category/multiplayer-network-compendium
https://wizardcell.com/unreal/multiplayer-tips-and-tricks/
2 must read

[mystic estuary]

Hello, does anyone know how to make cheat manager work in a dedicated server environment? Anytime clients try to use any cheat, it says that the command is not recognized, even default commands, such as ToggleDebugCamera

[thin stratus]

Might need an EnableCheats command first

[mystic estuary]

Is it a console command I can enter in ~?

[quasi tide]

I think it's a build.cs thing?

[thin stratus]

Yeah, that's for Clients in general

[thin stratus]

I know we had to do that on builds in The Ascent too and that was ListenServer

[mystic estuary]

Yeah, it makes it work. Thank you

[mystic estuary]

But how would you enable it in a build?

[thin stratus]

Just keep in mind that the console is usually not shipped

[thin stratus]

Idk

[quasi tide]

I think it can also be enabled in the gamemode or something like that

Or playercontroller?

I can't remember

It's ancient, so it is everywhere

[mystic estuary]

GM doesn't seem to have anything with "cheat" in it

[thin stratus]

Just check what EnableCheats does haha

[mystic estuary]

Yeah, true, but I guess I have to do that every time I start PIE

[quasi tide]

Or just write your own

[mystic estuary]

I guess I can make so that PC does what EnableCheats do on BeginPlay when it's an editor build, and it'll work fine

[thin stratus]

Cheats are just some function run on an actor

I think they can't even be RPCs by default

[mystic estuary]

They kind of can using ClientMessage(ConsoleCommand(FString))

That's what Lyra does

[thin stratus]

What does client message ultimately run through

Probably the PlayerController or so

[mystic estuary]

Yeah, it's a PC function

[rich crag]

Ey my dynamic open world replicated harvestable foliage/ resource sytem is working now! Not possible without this discord, and especially Cedrics Compendium

[silver pendant]

I have most of my actors and components usable functions starts by a (RunOnServer) events, so it only be executed on server from owning client, and only server may execute Multicast events when only needed, so checking of data will be on server, and setting things might be on Multicast or only server

using rep notify for variables these are related to refresh functions and etc.

using switch authority, on begin play events that executes a spawn actor, so it doesn't spawn it twice.

I assume that that will prevent cheating by checking the data on server, and only owner will execute the operation + these events are things like : {shooting, set ammo amount}

I read more about replication in the unreal source and a link in the pinned messages above.

the question is am I on the right path?

[dark parcel]

if you spawn a replicated actor with multicast you are already doing it wrong

unless there is some uses that I am not aware off

[silver pendant]

don't worry no multicast on a spawned actor, now I'm like using almost 3 multicast events, because I needed to.

[rich crag]

So i lied. swapping to open world with multiple foliage actors breaks my harvestable foliage system... sigh

works fine in a map with a single foliage actor

[grim dove]

👀 Mover 2.0 got committed to the 5.4 branch https://github.com/EpicGames/UnrealEngine/commit/a4b2f5ec21a25f5b2bcf65176d3d48bff9e1e497#diff-970238071cb65248fc78da89d80ec4e6da33745234a4c6ab003b62d1788cbf41

[twin juniper]

Hey, should i predict actor creation and destruction?

How would i destroy an actor on the client, then tell the server to destroy that actor later though? The pointer is gone when i destroy it on the client

Use something like NetID?

[solar stirrup]

tell the server to destroy the actor then destroy it

[twin juniper]

A forum said that i should toggle visibility and disable collision on the client

[solar stirrup]

or that yeah

probs saner

[twin juniper]

https://tenor.com/view/hmmm-thinking-batman-gif-6153870554148391864

[solar stirrup]

nah

not a sane option

im tired ignore that

[twin juniper]

but how about spawning though

can't just let it freeze mid-air

[solar stirrup]

what are you trying to achieve

[twin juniper]

trying to remove the delay by prediction

picking up item and drop item

[solar stirrup]

you can play cosmetic animations like fortnite does when you send the request

[twin juniper]

what..?

cosmetic animations?

[solar stirrup]

If your pickup simply just destroys the actor, make it invisible clientside while you send the request to the server

If that's absolutely necessary

as for dropping, I would really suggest not predicting that

[twin juniper]

yeah the picking with visibility sound fine

but the drop

[solar stirrup]

if you must you can always spawn the actor locally but unless it's pretty simple you're gonna mispredict most of the time

[twin juniper]

does fortnite predict dropping though

i don't play that much of the game
anyway i am overthinking, i'll just make it spawn on the server till my game become AAA, thanks for the help

[thin stratus]

Yeah, there are already blog posts about it being shown off

[grim dove]

:O where at?

[thin stratus]

pretty sure if you google Unreal Engine Mover 2.0

you'll find a blog post by vorixo

[grim dove]

sweet, thanks

[lucid badger]

https://vorixo.github.io/devtricks/mover-show/ Is this the article? Why is it written in past tense?

"Unreal Engine introduced Mover 2.0 in 5.4"

introduced

Shouldn't it be "is introducing" or is 5.4 out and I missed it?

wait a minute this is a scam, it's a video not an article at all, what a bait

[bronze glade]

Would anyone be able to help me understand why my player controller for the server is different from the client when the only thing changing them is the game mode switching during server travel? The client keeps the initial player controller from before server travel but the host gets the new one from the new game mode

[pallid mesa]

🙄

[lucid badger]

He actually said "blog post" so that one's on me. I was just dreaming of a bygone age where we didn't have to slog through videos to get news. Don't mind me...

[pallid mesa]

its an overview of a kinematic system, so a writeup wouldnt work as best as a video

[lucid badger]

Text alone sure, but screenshots would've sufficed for me but I know that's a lot more work to edit. Thanks for keeping it succinct at least

[pallid mesa]

a moving screenshot? a gif?

hahaha

[lucid badger]

I didn't need to see movement

I just wanted to know what was different. Words was plenty tbh

Screenshots just to show the ui and stuff

[pallid mesa]

well, its a... movement system 😄

[lucid badger]

Yeah but I can visualize movement

Like I said, don't mind me. I'm just too hyperactive. 2x speed is never enough for me

[lucid badger]

To use a metaphor, when I am shopping for a car I do not need to see video footage of the car driving 😛

[lost tinsel]

I'm experiencing a weird thing, focus on the green sphere, it's the sphere drawn at the center of the socket that I have on my pistol, on the left you can see that it's near to the pistol (client), on the right you can see that the socket is really not at that location (server), does anyone have clue about this?

USkeletalMeshComponent* SkeletalMeshComponent = GetWeaponMesh();

if (SkeletalMeshComponent == nullptr) return;

const USkeletalMeshSocket* SkeletalMeshSocket = SkeletalMeshComponent->GetSocketByName(FName("MuzzleFlash"));

if (SkeletalMeshSocket == nullptr) return;

FTransform SocketTransform = SkeletalMeshSocket->GetSocketTransform(SkeletalMeshComponent);
DrawDebugSphere(GetWorld(), SocketTransform.GetLocation(), 10.f, 12, FColor::Emerald, true);

that's the socket in question

I don't even know what to debug to find out the root issue..

[wintry crane]

So in my player state i noticed that when i host session my Beginplay is runned once on server, but when the client joins the session the beginplay is runned once by a server and twice by a client, can someone explain why is that happening?

[lucid badger]

Are you sure you're not seeing the server's playerstate? playerstate is on all clients @wintry crane

Like if you have a log out on beginplay for playerstate, when a client joins they'll see it once per player

You'd branch with IsLocallyControlled to limit to just the local one, I think

[twin juniper]

LoL how ObjectType of an UStatcMeshComponent is not replicated, so annoying to do a multicast

[solar stirrup]

why a multicast

make a new component that derives from UStaticMeshComponent and add a replicated prop

[twin juniper]

then add OnRep to that

then wake up tomorrow wondering what the hell this extra component class even for

XD

[solar stirrup]

✨ comments ✨

[hollow eagle]

...because you may not want to keep those values synced on client and server. Modifying collision properties is well outside the scope of what a mesh component manages, and that state can usually be derived from other properties that belong to an actor making it less efficient for the mesh component to replicate it.
Honestly even the static mesh itself being replicated is weird, but at least that you can turn off by simply not replicating the component.

[twin juniper]

i mean too much code for a single thing

what..?

[twin juniper]

lol you are right, my multicast fire off earlier than the pointer setup so i actually need OnRep

soon enough my project will be filled with 100 random component XD
(oh i can actually throw it in my actor class) (yay)

[solar stirrup]

welcome to game dev

don't use RPCs for stateful stuff

[twin juniper]

I am having some problem with OnRep

Apparently OnRep only fire if the value on the server change

But my value don't change (idk why)

Is there any way to force an update next NetUpdate?

[fossil spoke]

This is correct, OnRep only fires when the Client receives a new value from the Server

If you are using C++ you can change this behavior in GetLifetimeReplicatedProps

By changing the rep condition

To Always

If you change a value on the Server and need it to be updated to Clients as soon as possible you can call ForceNetUpdate on the Actor that owns the replicated variable

[wintry crane]

When i host session why is there only server execution and not server and client? i mean i host the server but i am also a client right?

[fossil spoke]

No you are not

[wintry crane]

D:

[fossil spoke]

The Host is the Server

The Clients are not a Host and therefore also not a Server

A Server cannot be a Client

Therefore a Host cannot be a Client

[wintry crane]

omg so like when i do replication i dont need to replicate for the host because he is the server

[fossil spoke]

Correct

[wintry crane]

not the client

thank you 🙂

[fossil spoke]

You dont need to send an RPC to the Host from the Server, because it is the Server

Mind you, calling a Server RPC on the Server will just run it as the function it is, it costs you nothing from a Network persepctive

[wintry crane]

note that

also i had problem before with execution which showed me that there are 2 clients, but then i changed from preview mode to standalone and it fixed it i guess i should only test stuff in standalone

[modern heron]

Anybody know why this works in PIE but not a standalone instance? If so how would i fix this These are in the player controller and Game mode. Post login and start game is in the game mode and then the client turn is in the controller.

[dark parcel]

@modern heron Is this local multiplayer game? (eg Split Screen)

[modern heron]

lan but not split screen

will add dedicated servers later on once more stuff was going but was using lan to test lobby etc

[dark parcel]

well just wondering if it's local multiplayer or Networked multiplayer

local multiplayer don't require any networking

but that don't seems to be the case for you

[echo bough]

LAN = networked

[dark parcel]

@modern heron what doesn't work?

It's weird that you get Player Controller that way, Player index only matter if you are doing Local Multiplayer

[modern heron]

its the only way that would return a value shrug lol But the the turns dont work at all when i launch a standalone launcher

[dark parcel]

What do you actualy want to do?

and is the delay necessary?

[modern heron]

added delays for debugging.

[echo bough]

No matter whos turn it is, you have to tell all the players whether if its your turn

Also, PostLogin is already in GameMode, you could've just call GetNumPlayers straight away.

[modern heron]

ill try that with game mode

[modern heron]

this is done becuase of this So i can set up logic to change the current players turn

[modern heron]

isnt that what that is? its in the game mode so should be replicated yes?

[sweet sage]

How can Pax DEI have 150?

[dark parcel]

I just test it and we can actually get the controller based on index from server :D. never know that, I thought its only for local multiplayer

[twin juniper]

Mainly want to do this for optimization.

[dark parcel]

@twin juniper RepNotify gets called on Server and Client if you are using BP

in C++ only get called on Client and it's more proper imo

for IsCrouching you just need replicated variable, it's already replicated by default

I think IsGrounded should run locally, no networking required

[sweet sage]

is unreal Iris using PushModel?

How do i know if Iris is running?

It does not change anything

[thin stratus]

Hence the "somewhat" :P

[fossil spoke]

PushModel is a per property choice by the developer.

Got nothing to do with Iris.

[twin juniper]

I'm talking about using RepNotify in a purely single player game, for optimization purposes.

IsGrounded in my case is a custom variable, not part of the movement comp

But that's just an example.

[thin stratus]

I mean the question is still fair. Maybe Iris exclusively uses it by default, removing the step and choice 😅

I don't see a very good reason for not using PushModel

[fossil spoke]

Sure, it doesn’t though lol

[silent valley]

I have a couple of Actor types (not pawns) that adjust bone rotations on the server. Replicating these to clients and applying them directly results in jerky motion for clients.
Is there anything built in I can use to smooth this?

Network Prediction plugin perhaps?

would prefer something simpler tbh 🙂

[thin stratus]

There is generally nothing build into the engine to handle that for you aside the existing classes such as Character.

NPP is for prediction. Not sure it handles smoothing.

It might provide you with info you can use to smooth but I don't think it directly smooths anything

[silent valley]

It's kinda both. I tried smoothing the values but it does not result in nice looking rotations, when it is missing the prediction part.

[thin stratus]

Means you are mostly required to code this yourself

[silent valley]

ugh :/

[dark edge]

Ignoring the overhead of being in blueprint to begin with, if you're getting one thing on tick, you might as well get it all.

[nova wasp]

the true cost of things done in your average game engine is often moving around memory rather than actual work

this runs counter to typical big O notation thinking, which still always means something but often ignores the nature of how computers work

[orchid eagle]

Hey there
so im kinda new to online and still don't perfectly know how to replicate and what stuff can be replicated and what can not
so a simple question for now can we use root motion anim montages in multiplayer i tried with root motion movement and that didn't work but will it work for attack/combo attacks anim montages that has root motion

[orchid eagle]

so here i have a replication issue
idk if that's the root motion or i did set something wrong

so as the Attack combo and Combo End was being Called in Animation BP using the AnimNotify i tried first to call them on server then do the multicast and that kinda worked so i can see the animation now playing on both the same
but still some animation get's cut or skipped or maybe glitched idk

another video with the issue visible

[twin juniper]

I've watched maybe 10 videos on replication basics and so on, including the ones linked in here. Can't wrap my head around a basic concept.

This is inside a pawn blueprint

Now is this getting called on the client or on the server?

And for the listen server, is it getting called twice, cuz the listen server is both a client and a server?

[orchid eagle]

that how i made it

you would need to call your code on the server then on the owning client

[twin juniper]

Is this currently getting called on the client or on the server?

[orchid eagle]

none

you didn't called it on any

if you want we can get in a voice channel and try to explain it

i didn't get what you mean but
to get it to work as i understand you would need to call a event on the server then that event would call another event which will be on Multicast means any active clients at the time it runs or on owning client means the Client who will fire this event will only be effected and none other will be

im not that good at explaining in words so i hope i didn't make it much harder 😅

[twin juniper]

xD

I understand what you are saying, and I know that, but my question is entirely different.

[nova wasp]

the ultimate answer is: it depends

the fastest way to find out is to just add a quick stupid print log or something that shows the PIE context of who is calling it

[twin juniper]

I added a print, the print appears on both the client and the listen server, as "Client0: Hello"

[nova wasp]

this is kind of a weird one as it's a global input event thingy... you generally use actual input bindings

this is probably sending input to all UWorlds created by the editor instance

[twin juniper]

Well not particularly input, my question is if I call a node inside a pawn, without an RPC, does it get called on client or on server.

For example if I add a print string to begin play.

[nova wasp]

does beginplay run on both client and server?

[twin juniper]

I do not know, it is the pawn begin play.

I have a listen server, and a client.

[dark parcel]

It does just like any function

Oh sorry we're u asking him?

[nova wasp]

I'm posing a rhetorical question here

I'm painfully aware of how beginplay works in sometimes more detail than I want lol

[nova wasp]

the short answer is yes, but it depends on what kind of actor it is

[twin juniper]

That is very cool, but I can't answer rhetorical questions when I don't understand the basic concepts.

[dark parcel]

@twin juniper I think you should be aware that each machine run their own world. It's Ur job to place what runs on the server and what runs on the client computer

[nova wasp]

sorry, just trying to lead towards the problem solving I guess

actors that are created dynamically (yellow in the world outlier I think) that are replicated and relevant will show up on both and beginplay

[twin juniper]

I do understand that. There is a Server, and there are clients, everything that happens on the server, happens for the clients. In case of a listen server, the host (listen server), is both a server, and a client.

My question is much more basic, and still unanswered.

A print string node attached to begin play inside a Pawn, does it get called on client, on server, or both? And if it is inside the Listen Server pawn, does it get called twice?

[dark parcel]

Not everything what happend on server happend on client no

Everyone run their own world

U decide what to sync

[nova wasp]

by default you probably have things like replicating movement enabled

that works via a series of replicated values that have everyone receive a roughly close enough idea of where something is at a given moment and how fast it is moving

[orchid eagle]

im dying here

[nova wasp]

yes you can use root motion in multiplayer... the CMC supports this

[orchid eagle]

i know i can but did you see my setup

[twin juniper]

I've heard this in 10 different ways, in 10 different videos.

My questions is still unanswered 🙂

[orchid eagle]

something is not working there there is a lag or like some animations are not being played or skipped

[nova wasp]

I don't really know enough about it to judge the setup, sorry... I think you can see an example of root motion being used for CMC movement in a GAS task... I think

[nova wasp]

is this about the listen server?

the listen server will not do things twice... in the common case

[twin juniper]

A print string node attached to begin play inside a Pawn, does it get called on client, on server, or both? And if it is inside the Listen Server pawn, does it get called twice?

[orchid eagle]

im not using GAS + im not doing a movement there 😅

[nova wasp]

it's working both as a client and a server, but it doesn't really need to replicated to itself etc

[orchid eagle]

anyway will keep looking for why is that

[nova wasp]

anything it is spawned on will call beginplay, whether it is replicated to them is another matter

[nova wasp]

while a root motion montage is active the CMC has vastly different behaviour

if you are not doing this on the server and client then discrepencies will occur I guess

[orchid eagle]

im doing it on server and client

[nova wasp]

doesn't change the fact that it could happen at a slightly different time than you intend afaik...

[dark parcel]

Take a step back from multiplayer mind. Here's what happend. When a pawn begin play called in my machine. My machine will run the begin play code, regardless of client or server

[nova wasp]

a listen server does not do things twice in this sense if that helps

a listen server is a client that also runs server code and replicates stuff to clients, but they still have one UWorld just like a dedicated or client

[nova wasp]

my guess is that the release/start is happening out of order, I gotta go though

[orchid eagle]

im not using the Release at the moment just the click or start

[twin juniper]

If I have to replicate it manually, by calling on both client and server, then what exactly does the CMC replicate Automatically?

[nova wasp]

yeah... not sure what parts of this are being done on simulated proxies (other players seeing it)

there are conditional things in RPCs that are not being sent as part of that RPC, like that "saved" thing

[dark parcel]

Cmc is too complex for me. I am just a beginner.
But here's a spoiler, you can't do sprinting in blueprin for network cmc

@twin juniper delgoodie goes over how to setup sprinting in multiplayer using cmc.

The rest of tutorial you see in yt using blueprint is a scam

[nova wasp]

overriding GetMaxSpeed should get pretty far at least

[dark parcel]

I think setting walk speed might be safe but deff need to flip the flag for sprinting imo. Could be wrong, I don't know much

I got it working thru copy paste 😔

[orchid eagle]

here is another video with the full issue very visible at the last 1m

[orchid eagle]

at this moment i see the same thing on both the client and the server so still the issue is when playing the anim montage the character would try to correct its position you can see that at the last part in the video

[nova wasp]

why leave out if this is a listen server or dedicated?

[orchid eagle]

what do you mean ?

[nova wasp]

I can't see what you are actually doing in PIE, if this is a listen server or a dedicated where both viewports are clients

[orchid eagle]

its dedicated

[nova wasp]

yeah you seem to be on a dedicated here

[dark parcel]

They already have the frame work for networked movement. It's just can't be extended using blueprint

Blueprint multiplayer is very limited. Don't quote me on this, ask the mod that actually work on multiplayer games

[twin juniper]

I am not extending it, I am setting the built-in variable of MaxWalkSpeed...

Which if it can't handle replication of it's own built in variables, then I don't get the point of it.

[dark parcel]

Sure but you also have a sprint variable u make and setting it

That's not gonna work

[twin juniper]

Forget the sprint for now.

[dark parcel]

I haven't seen your code

[nova wasp]

that is not a replicated value if that helps

[twin juniper]

Thanks for trying to help,

[nova wasp]

https://www.casualdistractiongames.com/post/2017/05/09/UE4-Root-Motion this may help

if all else fails you can cheese things by turning off cmc corrections temporarily, but that's more for the overall "shift" between positions not being weird and less for it even happened

I gotta go, I've never had to deal with root motion stuff (in depth) but I wonder if UAbilityTask_ApplyRootMotionConstantForce has some ideas

[orchid eagle]

i saw it already but didn't really help
thanks anyway i will try some stuff and see if it will work or just wont

[wanton copper]

Hi all,
I'm currently in the process of implementing a menu for a local/online multiplayer game. The setup I currently have is a Game Mode with a Player Controller class but no Default Pawn class. To me this makes sense since I don't need a physical entity for the menu but in various tutorials I've watched they're all using pawn classes. The issue I'm having is that by default my game mode is creating a single player controller and I want to create more, but without a player controller I'm not sure what the appropriate way to listen for a controller input is (i.e. "Press X To Join").

So 2 questions really:
1 - Am I missing something about the player setup I've seen in these tutorials where I should be using a pawn for some reason or does it make sense to just have the player controller for a menu scene?
2 - Are there any ways for me to listen for controller input before creating more local players, or should I do something like:

- add / remove local players as gamepads get connected or disconnected
- use those player controllers to listen for inputs to join a lobby system or something```

[tardy fossil]

I want to create more but without a player controller im not sure i follow.. more what?

[wanton copper]

Create more local player controllers

without a player controller I'm not sure what the appropriate way to listen for a controller input is (i.e. "Press X To Join").

sorry

bit of an unclear sentence

[grim hill]

hey guys, i’m trying to make a local multiplayer game in ue but the assign player 1 to game pad option is broken in the engine. ue5.3 is there anyway to fix this with like c++ or something?

[safe marsh]

Hi, I have a question about sending player data on connect, Is it possible to send a data payload to the server when the PlayerController connects via OnPostLogin ? Or are there any other methods to send data as early as possible
Currently I am using BeginPlay on client-side playercontroller to send the data via RPC to server-side playerstate to verify it and then set/replicate it to all connected clients, is there another way? mainly in BP

[dark parcel]

OnPostLogin is called by the server not client machine

use AcknowledgePossesion to run something on client when they Posses a character

you can send Server RPC to send data from client to server machine

Or Alternatively you can let the server call Client RPC

OnPostLogin -> Get New Controller as Target -> Run Client RPC

[safe marsh]

right, I meant when they are joining a server, if its possible to send a struct or something which would arrive with OnPostLogin

similar to how you can send initalization parameters when opening a new map

[dark parcel]

wdym arrive in OnPostLogin and no

OnPostLogin->Get Controller -> Run Client RPC
In the Client RPC -> Run Server RPC to send server data

Data "readiness" depend on ping

don't account for something to be available instantly between server and client in networked environment

[safe marsh]

ok, I will get the server to run the client rpc onpostlogin, looks like that is the earliest way to do it in BP. as for sending data during the auth process, it looks like it is not possible in BP alone

[dark parcel]

not sure what auth process is

[orchid eagle]

so im really tired of this root motion animation montage issues when replicating
like really no video or a docs or any info anywhere to do that
it should work just fine but it doesn't same for the Motion warping it should be replicated the same way but it wont and my character would just be snapped to the target location and do lot of flickering
please someone watch the video and see if i have my replication setup is correct and if that a replication issue or a root motion or a motion warping issue

also i can share my screen if anyone want to go trough my code and check

[worthy wasp]

in an OnRep function - is there a way to tell what the change was - some overloaded function that i could be doing instead of the below?

    UPROPERTY(BlueprintReadOnly, ReplicatedUsing=OnRep_LearnedAbilitySet, Category = "VI|Abilities")
    TArray<FLearnedAbilities> LearnedAbilitySet;

    UFUNCTION()
    void OnRep_LearnedAbilitySet();

[dark parcel]

You can get the old values

[worthy wasp]

by asking this i also mean i dont know HOW to do that 😛

[dark parcel]

I know u can 100% but I haven't done it my self :P. Have u tried passing a param?

[cursive steeple]

You create a param in your onrep func and name it the same as the property youre replicating. UE will pass the old value automatically then.

Actually dont think it needs the same name even just same type probly.

[cursive steeple]

Sidenote, fast tarray replication is also an option with some clear drawbacks (ie order of elements may not be synced properly), but it provides callbacks for changed/added/removed array elements. Needs some setup but may be worth looking into later.

[worthy wasp]

i'll have to look this up - is this new functionality?

[orchid eagle]

[cursive steeple]

I'm pretty sure it also existed in UE4

[dark parcel]

You figured how to pass the old value?

[worthy wasp]

workign on it - having some C++ stuff with making a ToString on a custom struct i made

for debuggin ganyways

[copper pendant]

pls help, why its stop working i dont understand

[worthy wasp]

my initial guess is this is beign ran on the server... whats your netmode? Are you doing LIstenServer or DedicatedServer?

shit ... i retract that - obviously its being ran on server - BeginPlay runs 2x - AsClient & AsServer

[copper pendant]

yes its listen server
how to fix it?

[dark parcel]

@copper pendant You have to understand that begin play will get called when ever a controller is spawned

So in your server, when a client join, a controller is added to server thus the begin play is called (On Server)

and inside that PlayerController that doesn;t belong to server, it's trying to create widget and add thhe viewport

which obviously won't work because it;s not the local player

You can fix it by adding IsLocallyControlled and a branch

this way the code only runs if the controller is owned by the local player

[worthy wasp]

hell yes! @cursive steeple was right ont he money ....

void AVI_PlayerController::OnRep_LearnedAbilitySet(TArray<FLearnedAbilities> OldValue)
{
    for(auto each : OldValue)
    {
        UE_LOG(LogVIPlayerController, Log, TEXT("%s LEARNED ABILITY SET OLD VALUE => %s"), NETMODE_WORLD, *each.ToString());
    }
}

ONLY PRINTS old values - i'm certain i can put in the newest value (LearnedAbilitySet) - and do the same but i'm not interested. this works!

[dark parcel]

void AAGPlayerCharacter::OnRep_Health(double OldValues)
{
    GEngine->AddOnScreenDebugMessage(-1,10.f,FColor::Green,FString::Printf(TEXT("Old Values : %d"), OldValues));
    GEngine->AddOnScreenDebugMessage(-1,10.f,FColor::Green,FString::Printf(TEXT("New Values : %d"), Health));
}

@worthy wasp was trying for you but haven't test it

but yeah, I know it can be done, just never actually do it

[worthy wasp]

i have some lifecycle things happening - and replication events that need to happen first... i was callin ga delegate before the OnREp funciton was firing for htis TArray .... so when the delegate fired (client) - the TArray wasnt updated - and i wasnt getting expected results.

i'm just going to move to the OnRep with the delegate that i was doing before.

i hate programming for ListenServer - its complex :/

or i should say - dedicated server programming is much easier lol

[dark parcel]

oh nvm it's a pawn function

try IsLocalController

@copper pendant

[copper pendant]

it helped to fix error pop up
but still for some reason my client is refusing to load widget

[finite spindle]

Hey i was wondering if anyone knows how could i execute gamemode event on a player controller (such as kick a player on a dedicated server)

Or send a message from a widget to another player

[dark parcel]

@copper pendant

[finite spindle]

the only documentation if found is with an hosting player (so you are the server)

[copper pendant]

strange..

[twin juniper]

I have this code:

And this is the part I don't get. When I press G as one of the clients, Shouldn't on one of the clients it print "Simulated Proxy", and on the server "Authority"?

[copper pendant]

maybe when i moved files in my project around inluding levels and widgets - somithing broke

[dark parcel]

could be anything really, I can't tell without having the project at hand

[dark parcel]

Server Machien have Authority over those actors
Client machine don't have Authority over the actors

[twin juniper]

The clients shouldn't print authority according to your logic, and the logic that I understand.

[dark parcel]

@twin juniper I don't really remember Local Role / Remote role. better print it and take it as the truth

[quartz iris]

Why does it not save the mouse sens variable on restarting the game in the editor?

This is the code within the game instance

[dark parcel]

@quartz iris #blueprint show me where you call Save Game function

[dark parcel]

but you never save it?

[quartz iris]

?

[dark parcel]

you are only setting the variable in the save game object but you never called Save Game To slot to write the .sav file

[quartz iris]

ah i see

like this?

what do I use for the save game? this one?

[dark parcel]

well not just that, there is quite a few mistake

you load the save file over and over

#multiplayer message

[dark parcel]

You should just load once and refer to the same save game object instead loading a new one all the time

head to #blueprint I will read more there

[quartz iris]

ok

[finite spindle]

Hey guys, if i have an admin in my game and want to send message to other player how can i do this ? Only the admin could do this (using a dedicated server)

[torpid girder]

hello, i am trying to understand why my client call isn't working, (i have other calls working but i just added a new one)

    UFUNCTION(Client, Reliable, WithValidation)
    void ClientUpdateBuildingList(const TArray<FGuid>& Buildings);

i've put a break point on the call to ClientUpdateBuildingList, but i never see a break point being hit on the implmentation

and nothing in the logs either

[twin juniper]

Hey guys, i have a chest in the server, and each player opening the chest in client side, creating their own widget. One player put an item in it. How do i update all other chest widget with new item?

[twin juniper]

if you use Reliable, then you should delete the WithValidation

[solar stirrup]

It's more like you're not supposed to use WithValidation with anything but Server RPCs

[silver pendant]

when I spawn a component on server then a player joins, I can't find it there, it only works with actors, is there a way to fix that?

[graceful flame]

When a player takes or adds an item cant you just multicast the change in state from the bp_chest actor?

[torpid girder]

i had thought reliable added extra overhead like TCP, and validation checks if the data is sensible

ok lets try that

[solar stirrup]

barely and no

depends on what you try to do

[twin juniper]

the widget is not replicated

the player own the widget

the chest don't know about it

[graceful flame]

Reliable should only be used if the event MUST not fail because it would screw up gameplay too much. Ex: A boss spawning into the match for a PVE mmo should be reliable, but something like casting a spell or opening a door shouldn't be reliable because those can just fail and the player can retry without any issues.

[graceful flame]

then use playerstate to store the inventory

[torpid girder]

i understand the use case, i mean at the protocol level they must have coded some sort of transmission control into udp

[graceful flame]

I think it just auto retries until it gets an ack

[twin juniper]

the chest..?

[graceful flame]

Which can be problematic when bound to user input because they can spam the input and overflow the relaible buffer which causes a DC

[twin juniper]

that's a questionable design

like the player suppose to open the chest, not store it

[graceful flame]

When the player takes an item it goes into playerstate right?

[twin juniper]

im not talking about the inventory, im talking about the chest

[torpid girder]

even so that those changes didn't do anything, i've done something dumb

void AAvalonPlayerController::InitializeBuildingList()
{
    if (GetLocalRole() == ROLE_Authority)
    {
        AStormbaneGameModeBase* GameMode = Cast<AStormbaneGameModeBase>(GetWorld()->GetAuthGameMode());
        if (GameMode)
        {
            TArray<FGuid> Buildings = GameMode->GetSuitableBuildingsForPlayer(this);
            ClientUpdateBuildingList(Buildings);
        }
    }
}

[twin juniper]

like an actor on the ground

not belong to playerstate or playercharacter

[torpid girder]

these simply gets a list of possible spawn points based on game rules, and should push them to the client

so this is called at beginplay

i wonder if this is the wrong time to call this

[graceful flame]

right but if the playerstate changes then the other actors such as bp_chest can read from the player state who interacted with it and broadcast out the change so other players interacting with it can update their widget

[twin juniper]

but the chest doesn't belong to playerstate, how does the playerstate changes

what are you talking about

[graceful flame]

where does the item go once they open the chest and take it?

[twin juniper]

ok, for clarification, let's just say the player didn't take or add item, but just move it to another slot in the chest

like organize it

how would other players get the widget changes?

[graceful flame]

So then the chest has replicated state for its own inventory, you can dispatch an event (item moved for example) and pass along the item index and its new location. Then any player who has the chest open can bind an event to that dispatched event inside of their widget.

[twin juniper]

then ill have too many event dispatcher

[graceful flame]

just need one

[twin juniper]

i dont use bllueprint, but i guess that's delegate in c++

[graceful flame]

or two or three i guess for how ever may unique events, move item, take item, add item...etc

[twin juniper]

yes

and it's not 3 lol at least 10

[graceful flame]

How?

[copper pendant]

i figured it out
problem was i created gamestateBASE
instead of his child
when i switched them widget appeared!

[twin juniper]

i have many feature that's how

[torpid girder]

i bet i have the sequence of events wrong, i probably shouldn't make a call from the server to the client to push the spawn locations, i should have the client request it from the player controller

[solar stirrup]

You should probably use replicated properties not RPCs

You can set the available buildings on the server and they'll get replicated down to the client

[torpid girder]

yes you are right that is probably the better way of doing it, i don't know why i am treating spawn points differently

it is no different that character selection

if i iterate and make multiple inserts, that won't cause multiple replication events will it?

[inner hearth]

hi, help someone figure out how to set up replication correctly, pls) I have Units (Characters) that are combined into groups - for this I create a separate actor where I save links to all Units of this group and also save a link to this actor in each unit. and also in the player controller I want to store references to the player's unit groups(as array for example), and the question is how to replicate these groups?

If I pass to client a link to a group object when creating it, then this object may not yet be replicated on the client and the link will be invalid. Is the only way to get the correct links to actors to search for all the actors every time you need to select something?

[solar stirrup]

Replication is done at the end of the game loop

So dw

[torpid girder]

i thought as much, i never checked that there wasn't some hook in F or T vars that made them special

[torpid girder]

i have a feeling i should still make a client to server call to force the server to give the client the spawn locations rather than the server's player controller pushing it on beginplay

[silver pendant]

I have an actor which is the owner of a component, but still I can't use (RunOnServer) events from that actor in the component, unless I use a (RunOnServer) in the actor

[twin juniper]

did you set owner

and make the component replicates

[silver pendant]

the component isn't spawned, and It's set to replicates, and I'm also using that check which returns true

[solar stirrup]

If it's a default subobject it's already got the correct owner

Where are you trying to call the server RPC

[silver pendant]

from the begin play of that actor it self

[solar stirrup]

What kind of actor is it

[silver pendant]

just a blueprint actor, and It's set to replicates

[solar stirrup]

Okay but what kind of actor

just AActor?

or pawn, player controller etc

[silver pendant]

the first one

[solar stirrup]

okay i see where you got confused

[solar stirrup]

you can only call server RPCs on actor and actor components you, the player, owns

print the actor's owner

[silver pendant]

ok

[solar stirrup]

actor not component

[twin juniper]

but he said the server call run on the actor

so that's weird

[solar stirrup]

servers can run servers rpc fine

not clients

[twin juniper]

they both client..?

[silver pendant]

so it should always be owned by the player pawn or controller?

[solar stirrup]

If you wanna be able to call Server RPCs on an actor it needs to be owned by the player controller yes

[twin juniper]

you should read the ownership document

[solar stirrup]

so on the server when you spawn the actor set the actor's owner to the PC of the player

[silver pendant]

but It's placed there, not spawned, what is the solution for that

the weapon actor

which is trying to call that function on It's own component

[twin juniper]

beginplay setowner getplayercontroller 0

[silver pendant]

what if It's a split screen game

you sure there is no other way?

[lost inlet]

iirc it can be the pawn too (since the PC owns that)

[twin juniper]

what..

[lost inlet]

what's splitscreen to do with it?

[twin juniper]

split screen multiplayer game?

[silver pendant]

that means there is 2 controllers

[lost inlet]

yeah, and?

[silver pendant]

an example, and can be yeah

[silver pendant]

I can't use controller 0

[twin juniper]

but then you only need the replication

any controller would be fine

[lost inlet]

well using controller 0 is objectively bad advice

for mp

you clearly have a place where your weapon is spawned and you would need context there for what player it's being awarded to

[silver pendant]

what I mean that I want a way without making an onwer for the weapon actor

[lost inlet]

so that's your owner

what? you need an owner

and I don't know why you'd want to fight that

[twin juniper]

https://docs.unrealengine.com/5.3/en-US/actors-and-their-owning-connections-in-unreal-engine/
you can read this, it would make things more clear

[silver pendant]

I have a weapon actor placed in the level which is calling an RPC on it's component, on begin play

[lost inlet]

that sounds like bizzarre architecture

[twin juniper]

if every single actor on the map has its own connection, it would be hard to manage i guess. So unreal engine design it the other way

[silver pendant]

what about the deticated server, can't I make it as the owner of all actors placed in the level?

then I have to call on server always 🤔

[twin juniper]

you don't make server the owner, you make the connection the owner

[silver pendant]

I think I have to set owner on begin play for each actor trying to call RPCs of It's components

[silver pendant]

yeah, the Issue that won't work well on the same PC testing

[twin juniper]

just make your own aactor class and then make child if that's you want to do

[silver pendant]

so if the bullet is owned by the weapon which is owned by the player, can the player call an RPC in the bullet

that seems correct

[solar stirrup]

yes

It goes up the chain of ownership until it finds a player controller

[silver pendant]

I found also that add component isn't replicated at all

I need to replicate it on multicast

[solar stirrup]

that's bad

[silver pendant]

why?

[solar stirrup]

make sure the actor is replicated and the component is replicated

[silver pendant]

yeah they are

[solar stirrup]

show code

[twin juniper]

https://tenor.com/view/smile-sponge-bob-send-nude-rainbow-gif-16430893

*code

[silver pendant]

I was testing and I found this is the only way to replicate add component so it shows up for all clients and server

so now how can I set the owner of the actor while testing in Unreal, because I might have 4 controllers?

because I'm testing on one PC

[rain crown]

I am beginner in ue5, however i wanna make a simple first person shooter with multiplayer AND... the multiplayer is my issue. Could someone suggest something with it?

[dark parcel]

Suggestion would be to start single player

Multiplayer fps is not simple by any means

[twin juniper]

Yep

[bronze glade]

When I get the player array from gamestate, I get a warning it is pending kill or garbage unless I add a delay before checking. Is there any variable or function I could use to wait until the player is fully ready before trying to access them? I'd prefer to not just wait a set amount of seconds in case someone has a really bad connection or so people don't have to wait if they don't have to

[solar stirrup]

PlayerState's BeginPlay

[bronze glade]

Okay 😄 This function is in the gamemode. So in playerstate begin play I would set a variable to true or something and in the gamemode just loop until I get that as true? Or is there a better way?

[sinful tree]

On Begin Play of PlayerState, use a Has Authority (Authority) > Call function in Game Mode.

[bronze glade]

Well the server player is actually not failing, but the client is failing unless I wait a second or two after the server travel I am doing (I am assuming due to internet or some sort of connection delays). So has authority would not work for the client scenario right?

[sinful tree]

If it's happening on the game mode, then it's not happening on clients.

[bronze glade]

I'm not sure I understand. I am just trying to access the player state but it's too soon because the player hasn't fully joined I think. The player array from game state has 2 players, but the new player says it's pending garbage or kill unless I wait an extra 2 seconds for example for it to fully load (at least I think it's due to loading). The host player state is working fine, just the client is saying that when I try to reference it

I am trying to figure out when the client is fully ready

[solar stirrup]

What function are you doing this in

[bronze glade]

This is in game mode, I am getting game state player array and then trying to access the player controller from the player state. But when I run Get Player Controller on the client's player state from the array I get a warning unless I add a 2 second delay

I know game mode is server only. I am not doing anything to run or change things for server/client. Just trying to wait until client player controller is loaded into the game world properly

[sinful tree]

Begin Play of the PlayerState is the correct time for when PlayerStates become valid. If you're trying to trigger logic in the Game Mode when this happens, then the only place you need to trigger it is on the server as clients do not have access to the Game Mode.

If you're trying to do something clientside, like say, display something in UI when a player joins, it's still the Begin Play of the PlayerState that you probably need to use. You could have it call into a function on your GameState which clients do have access to, and have an event dispatcher in the GameState that other actors or UI could bind to know a PlayerState has started. So it could be like:

PlayerState Begin Play > Get GameState > Cast To your custom GameState > Call "PlayerStarted" event passing along the "Self" reference of the Playerstate > "PlayerStarted" event calls OnPlayerStarted event dispatcher in the GameState.

Earlier in some UI or some other actor:
On Construct (Or Begin Play) Get GameState > Cast to your custom GameState > Sequence (Part 1) > Bind Event To OnPlayerStarted > Have it Update UI or actor based on the new playerstate starting
Sequence (Part 2) > Read the current PlayerArray from the GameState and update your UI or actor as needed with the PlayerStates available.

[bronze glade]

The game state makes sense, I could try that. I was hoping there was just a node or something similar to "is Valid" for this scenario but probably not.

Like I said I am not trying to display UI or anything like that. I am just waiting to start any of the game until all players are loaded in after a server travel

I'll go with game state, thank you for the detail! Just wanted to verify if there was another way to confirm all players are fully connected and loaded before implementing anything. Thanks guys!

[solar stirrup]

Easiest way is to have the clients execute a Server RPC when they've finished loading stuff like their player controller, player state and the game state

And whatever else you need

[bronze glade]

Okay thank you 🙂
Sorry for not communicating my issue well

[sterile prism]

Flipbook is not replicating. Any ideas

sorry for not zooming in

I guess it is replicating by making it appear and disappear. just not playing the flipbook

[vagrant grail]

Why does my raycast not detect the other player please ? All of this logic is in my BP_ThirdPersonCharacter and the collision of the BP_Character is set to "Pawn", so I'm kinda confused 🤔 Please ping me if any answer 🙂

[icy jetty]

Does the draw debug give any info?

And is anything printing on hit actor

[vagrant grail]

Found the issue, the "Trace Channel" parameter has to be set to "Camera" instead of "Visibility". I'm not sure to understand what this parameter does

[icy jetty]

That’s the channel you’re tracing on.

[vagrant grail]

What does it mean exactly ?

[icy jetty]

It means it’ll hit anything that has that channel checked as Block

So usually visibility should do the trick for Pawn (on default collision settings) unless that’s set to ignore or something else is in front of it etc

[vagrant grail]

is there any documentation explaining that ?

[icy jetty]

Explaining what? Am I confusing you? 😀

There’s prly some docs on collision, I had to learn the hard way tho

Very many things can go wrong with collision, many of them don’t seem to make sense at all until you find the issue

[icy jetty]

Debugging is often needed, hence why I asked those questions

[vagrant grail]

Then why it didn't work with my pawn set to "Pawn" and I had nothing sets to ignore if I'm not mistaking 🤔

[vagrant grail]

Kinda because I prefer detailed explaination because the fact that it didn't work for me makes me wonder if there's more things to know about that than what you said 😄

[orchid eagle]

so im still having the same issue when replicating the system
its so clear in the videos a lot of movement correction
also i have another issue where the Combo end event would be called most of the time and i repeatedly keeps clicking the attack button
but still it would be triggered
is there any idea how to prevent that?
something like after each animation
i would have like 0.5s and then the combo end would be called if no attack animation is playing and also have like after playing the first attack you would wait for like 0.2s before doing the next one so i would have a more clear combo

[icy jetty]

There prly is. Collision is a tricky bish

[vagrant grail]

What can I show you so you can see whaat was the issue ?

[dark parcel]

@orchid eagle Multicast and delay?

[orchid eagle]

im still trying to learn about replication 😅
so still dont know what should work and what wont

[dark parcel]

me too but imo you should have close to no multicast in a project

Gas uses Repnotify to play montages

If you are talking about root motion, it's already supported in CMC

[orchid eagle]

also i tried to call the motion warping event on server then do a multicast and that seems to work for like a few second and after that it would go back to the movement correction again

[dark parcel]

I wouldn't have delay too, I seen that pattern of doing combo from youtube.
You probably want to implement input buffer

no comment on motion wrapping, never touched it. I can play montages with root motion just fine tho

[orchid eagle]

I nevenr used GAS and dont have any idea how it works
but im trying to play some root motion anim montages for my attack system

[orchid eagle]

they work fine without the motion warping
but still gets some movement correction after playing for a bit

[dark parcel]

well in my opinion you shouldn't be multicasting about anything, especially animation

probably want to implement GAS to play your montage, that;s my plan for my game

[orchid eagle]

does GAS work with blueprints ?

[dark parcel]

yes but the boiler plate must be done in cpp

which isn't much

Pure blueprint for multiplayer is probably good enough for chess or any games that doesn't depend on ping

[orchid eagle]

my game is a dedicated servers game and not everyone would be on at the same time so will the repNotify work with that ??

[dark parcel]

No one will always be at the same time

everyone ping is different

[frail temple]

What's the difference between possessing a Pawn and a Character? I can possess Pawns fine but I can't Possess a Character as a Client.

[meager tiger]

#cpp said I might get better help here, so I'm extremely confused by something while exploring how multiplayer and replication works in unreal. I'm having an OnRep function being called on both the server and client when everything I'm reading says it should only be getting automatically called on the client and not the server.

UPROPERTY(ReplicatedUsing = OnRep_OverlappingWeapon)
AWeapon* OverlappingWeapon;

UFUNCTION()
void OnRep_OverlappingWeapon(AWeapon* LastWeapon);

...

void ATestCharacter::GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const {
  Super::GetLifetimeReplicatedProps(OutLifetimeProps);
  DOREPLIFETIME_CONDITION(ATestCharacter, OverlappingWeapon, COND_OwnerOnly);
}

// this gets called on server only
void ATestCharacter::SetOverlappingWeapon(AWeapon* Weapon) {
  DbgPrint("setting value");
  if (this->OverlappingWeapon) {
    this->OverlappingWeapon->ShowPickupWidget(false);
  }

  // this should trigger the call to OnRep on only the client but its getting called on the server as well
  this->OverlappingWeapon = Weapon;
}

void ATestCharacter::OnRep_OverlappingWeapon(AWeapon* LastWeapon) {
  DbgPrint("replacated OverlappingWeapon");
  if (this->OverlappingWeapon) {
    this->OverlappingWeapon->ShowPickupWidget(true);
  }
  else if (LastWeapon) {
    LastWeapon->ShowPickupWidget(false);
  }
}

The debug prints are being printed on both server and client when the client should be the only one receiving them. When the server triggers it, OnRep is not called at all, but when the client triggers it, OnRep is called on both. Am I missing something, did something change with how this works recently?

[dark parcel]

Posses should be called by the server

Character is a child of pawn, you can possess it

[orchid eagle]

okay so no other good ways to achieve that without GAS

[dark parcel]

if you are the listen server, you are also client. So it will get called on the listen server

[frail temple]

This works perfectly fine on another project that is just spawning a Pawn, on this project I'm trying to spawn a Character and I can't Possess it.(don't mind the disconnected pin, I just had to move a pin real fast for the SS and didn't notice it but it still doesn't work even when connected)

[meager tiger]

even if the server client isn't triggering it? I thought it should only get replicated to the client that triggers it with COND_OwnerOnly?

[dark parcel]

I would use a well known system that everyone is hype about. Still exploring it

[dark parcel]

COND_OwnerOnly will only replicate the value to the owner

what;s your print look like?

@orchid eagle GAS comes with built in prediction system or so I heard. That's crucial for many multiplayer game. I would suggest to just to use that to build your game

[frail temple]

It spawns the characters correctly, the client juts doesn't seem to register that it has possessed it (I run the OnPossessed event and it comes back null)

[orchid eagle]

im trying to look at it now
thanks ❤️

[frail temple]

No, no. It is connected

[meager tiger]

the prints are

DbgPrint("replacated OverlappingWeapon");

which essentially expands to a call to AddOnScreenDebugMessage

When a normal client (not the server client) triggers it, its printed to both the client that triggered it and the server client. When there are multiple other clients, it only gets printed on the triggering client and server client and not the other clients. When the server triggers it, its not printed at all (expected)

[frail temple]

It just doesn't work. It's just I had to move it for the SS

@dark parcel It's connected, client on the right still returns null

[dark parcel]

If I have to guess, it probably exist on the listen server too

[meager tiger]

hmm

[dark parcel]

I print on Rep stuff yesterday, it only get called only on client when the value replicates to client

will try to do a quick one

[meager tiger]

yeah its really confusing because everything I'm reading says thats exactly what should happen, but then I'm seeing the print fire on both client and server client, including the behavior that should only be happening on the triggering client

[frail temple]

@dark parcel A delay fixed it, not sure why I have to add a delay to this project but my other project I don't need one...

[dark parcel]

When you spawn the actor is probably not replicated to client yet

actually I have no idea

[frail temple]

But both projects have the exact same code for spawning and possessing, the only difference was that this one spawned a character while the other was a pawn. Like it registered that it spawned a character and set the players camera in the correct location, it just didn't register "Ohhh this is my character" haha

[dark parcel]

@meager tiger ```cpp
void AAGPlayerCharacter::OnRep_Health(int oldValue)
{
GEngine->AddOnScreenDebugMessage(-1,10.f,FColor::Yellow,FString::Printf(TEXT("Old value is : %i"), oldValue));
GEngine->AddOnScreenDebugMessage(-1,10.f,FColor::Yellow,FString::Printf(TEXT("New value is : %i"), health));
}

This only get printed once, no matter if the server or the client call it.

my OnRep not called if you are dedicated server tho

[meager tiger]

ok, so are you saying when you are the server and press v, its not printed. but when you are the client and press v, its printed once on both server and client?

[dark parcel]

No, when im the server and I press V. It gets printed (On Rep called) on Server Machine

Listen server I guess

[meager tiger]

gotcha

[dark parcel]

when I am the client and I press V. it only print once too, the server doesn't print

[meager tiger]

interesting

somethings messed up here

I guess I'll keep poking around, thanks for looking though

[dark parcel]

Imo since the listen server sets the Weapon for everyone, it should be called on Listen server?
So my guess is if u have 2 players in the world, both owning weapon, server will call twice.
If there are 3 players in the world, all got a new weapon, server will call 3 times

can you try with more players?

[grand kestrel]

Got a question about FFastArraySerializer. If I change the value of an item already in the array, do I still need to call MarkItemDirty() ? The header that has a mini-guide doesn't say I have to, but I'm wondering if it was missed.

[dark parcel]

@meager tiger My bad man, turns out my listen server never called OnRep

it's actually called on client

So health for my the player 0 character changes and it replicate to client since the client have a copy of that character

void AAGPlayerCharacter::OnRep_Health(int oldValue)
{
    UKismetSystemLibrary::PrintString(GetWorld(), FString(" is calling on Rep"));
}

taht's what happend when server press v

[meager tiger]

I might've figured out the issue, it seems the clients are returning true for HasAuthority, which is letting them setup callbacks to call SetOverlappingWeapon

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

  if (this->HasAuthority()) {
    DbgPrint("has authority");
    this->AreaSphere->SetCollisionEnabled(ECollisionEnabled::QueryAndPhysics);
    this->AreaSphere->SetCollisionResponseToChannel(ECollisionChannel::ECC_Pawn, ECollisionResponse::ECR_Overlap);

    // bind callback delegate (on server only)
    this->AreaSphere->OnComponentBeginOverlap.AddDynamic(this, &AWeapon::OnSphereOverlap);
    this->AreaSphere->OnComponentEndOverlap.AddDynamic(this, &AWeapon::OnSphereEndOverlap);
  }    
}

[orchid eagle]

i tried to look at GAS but that's not a easy thing i can deal with also i dont think i can merge it with my current character
also there is not much tutorials on using it with blueprints most of them are just too old

[dark parcel]

@orchid eagle multiplayer is not easy.

For non programmer like me

[orchid eagle]

yep i know
but for GAS its just not that easy thing or normal for non programmers

[dark parcel]

I'm following tutorial for that from udemy

But a lot of programmers think it's not good

[orchid eagle]

yep i saw a lot of people laughing about using GAS with blueprint 🙂

[twin juniper]

a good player movement using blueprints with multiplayer is literally impossible(really hard + there's pings to keep in mind): https://www.youtube.com/watch?v=YB_ew3j_HFw&ab_channel=Rory

[orchid eagle]

i already done with the movement and it work so perfect
just doing the attack system and i think the replication works fine i see the animations playing on both the clients fine but the root motion in the anim montage is the issue
my character keeps going forward with the anim then do like a movement correcting and go back to its old location
and keeps flickering

[twin juniper]

perfect on your device...

[orchid eagle]

i know it wont be that good with blueprints but i still don't know C++ im good with c# but not yet C++

[twin juniper]

that's already good

[orchid eagle]

so here is a new video
i tried to have another combo so i can see if all clients are in sync and when one plays a combo the other one can see it
but what i see is it doesn't sync i see one playing an combo and on the other view which is the server i see another combo playing
can someone verify if i have done the replication correctly and if not then give me like a hint or a clue on where my issue is

i would really appreciate any help

also if anyone would know a better way to achieve the same thing that would work too

[wintry crane]

u said that the host cannot be a server and a client, today i made it so that from my widget a call a function on a pc on a server and then server got my 2 clients' pcs and called function to run on owning client. from what i understood is that clent and server cannot be the same but the OWNING client can be also server? please correct me if i am wrong am really getting confused right now

Since widgets exist only on owning client so it would make sense? i hope im not stupid

[fossil spoke]

If you are referring to the “Owning Client” on the RPC event node, in that case it means the Machine that Owns that Object.

If thats a Host then its just an oversight on the naming

The Host will still have this called on it

Even though the Host cant be a Client

Any RPC you call on the Host from itself (Server context) it will be called normally

[meager tiger]

turns out the issue was really stupid. When you run the game in the editor with multiple clients, by default it runs the different clients all under one process, which apparently means the messages from AddOnScreenDebugMessage appear on all instances of the game, no matter which client executed the code. Unchecking "Run Under One Process" in advanced play settings makes the messages print on their correct clients

[dark parcel]

Ahh yeah that's why I switched to print string so I can check who's calling it

Doing it with debug msg got me fooled

[meager tiger]

yeah thats a really confusing thing to do

thats partly why I have all my debug messages wrapped because I had a feeling I was going to need to switch how they're logged at some point

[wintry crane]

yeah now i get it, owning client is someone who owns the object and it can be host or client

thanks

[tiny scaffold]

Is Someone able to help me understand what im doing wrong. on both the blueprint interface and server custom events the "Interacted Container Data" is correct however when it gets to the client event the data is blank. I am referencing a custom actor component. Are they not replicatable?

[thin stratus]

They should be but why are you calling a Server RPC followd by a Client RPC on the same Character?

Your code looks quite strange I gotta say

[tiny scaffold]

Yeah kinda forgot the blue print interface function is fired by the server

[orchid eagle]

guys im really stuck here i just want anyone to review my code and see if i did do the replication right or not and what might be the cause of this issue

[pallid mesa]

yes u do

[vagrant grail]

I have 2 cameras on my player to switch between FPS and TPS view, so I'm supposed to handle all of this on the client however, I need the active camera to start a Raycast when I left click to attack, so should I repNotify my variable named "currentCamera" that contains the current active camera ?

Also should I also handle the camera switching (beween FPS and TPS view) on the server too as if I set my variable to repNotify it has to be set on the server and also to avoid cheating (even that I don't see how can the client cheat with this).

[twin juniper]

Trying to simulate lag to fix bugs for my multiplayer

Can you explain what do these settings mean in terms of ping? Is this the equivalent of 400 ping?

Or is it 200 ping?

[solar stirrup]

You get lag on clients because you slow down what the server sends and receives

so it's gonna affect clients with something this bad

And yes it's equivalent to 400 ms of latency for the client because you're delaying incoming packets by 200ms and outgoing by 200ms on the server

@twin juniper

[twin juniper]

Thanks

[lost inlet]

there is absolutely no way HasAuthority returns true for (non-listen server) clients in BeginPlay unless the actor is being spawned on the client. also weird this-> usage

[lost inlet]

This sounds like micro-optimisation a little bit, but with structs you can have a custom NetSerialize

well I say a little bit, it just is

if order matters, then you don't want to use option 2. until Iris is the default, RPCs are not guaranteed to be received in order

rate limiting is likely going to be a more worthwhile optimisation

[finite spindle]

Hey did anyone already replicated a media sound component ? Seems like the component replication does nothing

[lost inlet]

why is that something that needs replication

[finite spindle]

Because only the server can hear the sound

Maybe it's because when i have different windows in PIE unreal block the sounds from the other window

[tardy fossil]

i dont think the media sound component does any replication in that way.. usually you use a RPC or replicated variable that makes the audio component play on the client side

[finite spindle]

There is a component replication in the add media sound component

[thin stratus]

@finite spindle Replicating a Class doesn't do much by default. If the Component isn't actually supporting Replication by actively replicating variables etc. then you won't get anything from toggling that.

[boreal wadi]

Has anyone had any experience with SnapNet ? I’m interested in it but wondering how far will I have to deviate from the replication techniques I already know

https://www.snapnet.dev

[upbeat basin]

If I add a newly spawned replicated object to a replicated array, is it possible that on the array's onrep function the added object is not yet available or fully initialized?

[tardy fossil]

i just quickly checked out the UMediaComponent code. it's just a simple uactorcomponent with a mediaplayer pointer.. doesn't actually do any replication

[thin stratus]

Looking at the feature list, the "Intergration" part is wrothless, cause why would one need Unity integration from a UE Engine o.o
Mid Match Instant Replays should be possbile with UE, so that's not really true.

UE has the NetworkPredictionPlugin (NPP) since recent, which can be used for a lot of stuff.
The CharacterMovementComponent is also going to be mostly replaced via Mover 2.0, which uses the NPP.

I give it credit for some of the Compensation features I guess. I don't quite get why they think their system AND UE can use Physics for Networking, cause despite replicating some bone locations, I would not dare to use physics in my network game.

Mostly seems like UE is very much equal to this. UE is also free on that end and doesn't require some random company's license. The missing features, despite maybe the physics part, could be coded if you know how, but I guess that's their selling point.
Speaking of selling, they don't even list prices.

Also they don't seem to post any videos of those features or?

[finite spindle]

Okay thanks guys !

[snow trail]

UE has the NetworkPredictionPlugin (NPP) since recent, which can be used for a lot of stuff.
how have i never heard of this
does it do client prediction?

[lost inlet]

Thought the name would be obvious