multiplayer

[fleet viper]

and its only that project

ok so i found something

its only that character class

every new character class works fine

[fathom aspen]

See if it's this setting then:

For that problematic class

[fleet viper]

already have it set to that

[fathom aspen]

Are you spawning your AI, or they are placed in the level?

[fleet viper]

placed in the level

[fathom aspen]

Hmm then there must be something else you messed with in that class

[fleet viper]

its probably because of something in cpp

prise the lord

i got it

had to remove getlifetimereplicatedprops function from the class altough it was not used

[twin juniper]

when I use the "event on post login" node it doesn't use the player controller I created for the players. Is there any way I can make use it?

[quasi tide]

Doesn't use the reference or the class?

[twin juniper]

I'm trying to spawn in the players and I'm using the "content examples" map from UE to spawn my players over a network. It uses the "event post login". I copied the entire thing but when I plug the possess node's player controller reference to the on post login's player controller reference. It uses the default player controller. I know it is because it ain't using the camera I set up using the player controller I created.

[quasi tide]

Did you set the right class in the game mode?

You're going to have to send code. I am unfamiliar with the example you are referring to. Sounds weird that you are manually calling post login.

[twin juniper]

this is what I used from the content examples

this is the camera that all the players are using. It uses the player controller array.

I tried another way to set up a spawning system but the issue I had was that the default player controller for local has an index but I need it for network

Hello, I´m following the blueprint multiplayer tut from epic. Do I need steam or such online services to host a game? or when I just host from the packaged app does someone find the game without anything?

[quasi tide]

@twin juniper What is the controller class you have for your gamemode?

[twin juniper]

it's the same I have for the world

all the gamemodes match

[quasi tide]

No. You can host a game just fine. People connecting or not depends on your router. The easiest way is to use a service like Steam though.

@twin juniper That doesn't tell me anything. Show me.

[twin juniper]

oh okay thats great thank you man.

[quasi tide]

You can do port forwarding and all that jazz, or have your own rely server.

[twin juniper]

I just took a screenshot of the whole gamemode

also, that is the other spawn system that only works for local

[fathom aspen]

You are overriding the wrong function

Override HandleStartingNewPlayer as there the pawn gets spawned

Also override FindPlayerStart and don't do the PlayerStart logic in there

[twin juniper]

don't do the player start in the gamemode?

[fathom aspen]

It's already in GameMode

The function is called FindPlayerStart

Find it, override it

If you don't like the default behavior

Also OnPostLogin won't get called in case of a seamless travel

[twin juniper]

gotcha

so, I can find player start and just set the tags up like that, but I see the HandleStartingNewPlayer has the same issue as OnPostLogin. It has the player controller reference but it's not referencing the player controller I created

It works out fine and all I can control my pawns but the camera I set up for all the player controllers doesn't work

so, I'm assuming they aren't getting the right player controller reference

do you know why? I can control my pawns no problem but it doesn't assign them the camera.

[fathom aspen]

How do you know this is the case? Did you debug and watch variables?

Print their names?

[fathom aspen]

I'm not sure what do you mean by assigning camera

[fathom aspen]

All I see is this function, but no where where it's called

[twin juniper]

hmmmm, you could be right because I'm just using an educated guess with everything is here. So, I do apologize if I'm coming off like a jerk.

but this function is my camera in the gamestate

now, without that handingnewplayer and onpostlogin it works normally

[fathom aspen]

No it's okay. Thought you had a proof, as it can't be the case

[fathom aspen]

Good now show me how you call it

I'm wondering too how someone can pass an array to SetViewTargetWithBlend?

Hello?

[twin juniper]

well, in netmode that's the only way it works

Idk why

but that's the only way I can setup a camera to be useable by everyone

sorry I was getting the screenshot for you

[fathom aspen]

Ok too many issues here:

1. GetAllActorsOfClass PlayerControllers I would not use for the simple reason that this array is already there. It's called PlayerArray. It's an array of PlayerStates. You GetOwner on each reference to get the PlayerController.
2. Widgets are client side only. You created them without caring where they are created. You saved a replicated reference to them which is again incorrect as they are client side. Also they are created in the wrong place. GameState isn't a player specific class. Usually player classes are the one who spawn them, eg, PlayerController/PlayerState...

[fathom aspen]

Also this function would only get called for the first reference in the array as you are not looping over elements

Find the compendium in this channel pinned messages and read it a few times

[twin juniper]

gotcha boss

[fathom aspen]

And try to to use less GetAllActorsOfClass, as usually there are other ways to get the actors

[twin juniper]

what other ways are there?

[fathom aspen]

Also you don't need to cache all the references from the start

From PlayerArray I can get everything

Also using this way you are prone to issues where some actor hasn't yet loaded when GameState loaded

So it's not counted in

[twin juniper]

I thought the only way to communicate between two Blueprints is to use that

[fathom aspen]

PlayerArray gets auto managed for you

[twin juniper]

gotcha

thank you so much

I am very new to all this

[fathom aspen]

That's not correct

[twin juniper]

really?

[fathom aspen]

I wouldn't have any of this logic in there

[twin juniper]

I know casting is another way to communicate but it's costly too right?

[fathom aspen]

Yes. Why would the GameState speak for the PlayerCharacter when the character is the one communicating with some actor on the map

[fathom aspen]

Casting is something else. And it depends

How much hard references you have and so

I would cast to the base engine classes when I can

And not cast to custom ones

And casting is usually fast

O(1)

[twin juniper]

ooooooh

[fathom aspen]

But it's costy on memory in case of too much hard references

Read the compendium and learn to use each class for it's job

Putting everything in the GameState is a sign of a bad code structure

[twin juniper]

gotcha boss

thank you

[vague spruce]

sup. i've got a light in the world that has a blueprint on it that calculates how it should move. i want to move it to server-side but i don't see anything about replication on the actor itself. my thoughts were to put the rotation on the gamestate and then replicate that gamestate to all clients every so often. is there a better way to do this?

i guess like, is it possible to replicate directional lights?

[hollow eagle]

just mark the actor as replicated, there's no reason to be using the game state for this

[fathom aspen]

Wondering why they hide the Replication category? Is it discouraged to replicate the actor itself?

[hollow eagle]

¯_(ツ)_/¯

you can just make your own actor that has a light component though

don't even need to replicate the light component, just the actor

[fathom aspen]

Yes correct. ez pz

RIP directional lights though 🪦

#epic-online-services

[grim rain]

Hello, im trying to get my visibility for a skeletal mesh thats part of the player mesh to be random. But unfortunately in game everyone sees the visibility differently. How to synchronize this in multiplayer? ( i call the function in my begin play in my player character)

[fathom aspen]

https://vorixo.github.io/devtricks/stateful-events-multiplayer/

[grim rain]

heyy thank you for that tutorial i tried following it using this method, but unfortunately does not work, the armor mesh is visible for one client and not visible for another client

[grim rain]

or did i do something wrong in the function? let me try doing the random bool inside the on rep

[fathom aspen]

What actor is ArmorMesh attached to?

[fathom aspen]

That has nothing to do with it. And it would result in inconsistent behavior

[grim rain]

the armormesh is just an additional mesh on my main player mesh which i used SetMasterPoseComponent in the construction script with .

[fathom aspen]

I just tested it as I was not sure if it had to do with SetMasterPose or the ConstructionScript and it works like a charm

Not sure what you doing really as there is nothing special about it

[grim rain]

im not sure either what im doing wrong D:

i got it to work i think

turned it into this and it works now

[limber gyro]

Hey guys, i have some niagara particles in an animation notify, i play the animation for the first person mesh localy then do a multicast for the 3rd person mesh so that the other players can see, the issue is that my particles are playing twice localy, one in the 1st person mesh and another one in the third person and i was wondering if theres anything already built in UE that blocks that so that it only plays once?

[limber gyro]

I think that essentialy it would be like a multicast that runs on everyone except the client that sent it

[lusty yarrow]

Hey is there any way to specify with which map a server should start by default? I have a collection of maps and everytime I startup a server I'd like to be able to add a command line argument or something to have them startup from a specific map.

[glossy plover]

At the end of the game I'm doing unpossess on all controls (so that all characters stop moving and it says "Game over" etc...), but if the player is holding down a movement at the time of unpossess then the movement continues on clients (not server), so if you were holding forward the character just keeps moving forward despite being unpossess....is there something i should do before or after unpossess in order to kill all existing movement?

Doing this seems to work, does that look correct?

[fervent gorge]

Why can possibly Actor has NerDriver, but NetConnection is null? Maybe i should turn on/off something

or maybe not every Actor has NetConnection

[hushed spoke]

Hello! Does anyone have any idea as to why the values aren't replicating correctly?

[chrome bay]

Well you're not guaranteed to receive every change to a replicated property so that's going to be a problem in the future if it isn't already

Recoil is usually calculated client-side, things happen too quickly for it to be networked

[hushed spoke]

Yeah that's what I'm doing, you can see in the video that the first 5 bullets the recoil is based on controller yaw and pitch input, then it switches to crosshair deviation. The issue is that the server is the one that creates the line trace, so I need to send the correct coordinates to it

[chrome bay]

You've got replicated properties there though

[hushed spoke]

Yes, I'm sending the coordinates to the server, setting it there

Or should I just make it locally and only send the final result to the server when I need to create the line trace?

[hushed spoke]

Also, what you're seeing is without network emulation, so shouldn't reliability not be thing at the moment?

Indeed, I checked the reliable check, and it worked as I want

What would happen on a high ping since I used reliable RPC?

[hushed spoke]

Answered myself, even on average ping it stops working again lol

[acoustic drum]

I think client prediction and non-reliable replication should work the best here

[chrome bay]

Generally when you shoot a weapon and it's hit-scan all you do is send the origin and direction to the Server, that's enough for the server to do it's line-trace etc.

And usually it's reliable, you don't want player shots to be dropped since they're pretty critical to gameplay

Any RPC/property update will be affected by ping/packet loss etc.

But in the case above you have replicated properties, which to me implies the recoil parameters are being replicated by the Server - which is not going to work

[hushed spoke]

Alright, let me change it back to the client level, and see what happens

[hushed spoke]

How does client prediction work? I understand the concept, but I don't get it in practice, is it just setting the variable on the client side, then sending a call to the server too?

[acoustic drum]

I don't actually know, I imagine it can get arbitrarily sophisticated. If you use the gameplay ability system it will handle client prediction for you :D

[hushed spoke]

Do you know any guides for it?

[acoustic drum]

The gameplay ability system?

Or client side prediction

[hushed spoke]

Gameplay ability system and it's client side prediction

[acoustic drum]

There is nothing to learn about its client side prediction afaik it just does it for you

[hushed spoke]

ah kk, I guess I'll just search for a guide on youtube

[acoustic drum]

And if all you're hoping to do is make a lightweight game and implement recoil then GAS might be a bit overkill but ill link you some resources

[hushed spoke]

I'm recreating CS:GO on unreal, you can check server from my profile

[acoustic drum]

https://docs.unrealengine.com/5.0/en-US/gameplay-ability-system-for-unreal-engine/

https://github.com/tranek/GASDocumentation

[hushed spoke]

Thank you 🙂

[acoustic drum]

Just for fun?

[hushed spoke]

Yeah, I started it since my internship uses unreal engine, but I might actually change CS:GO trademark and assets with original stuff and publish it

F2P

[acoustic drum]

Fair enough

CSGO is f2p now did you know

[hushed spoke]

yeah I know, but it's riddled with cheaters lol

Anyways, this won't replace the true CS:GO

But it might be a casual game someone might pick up when they're bored of the original one

[acoustic drum]

Unfortunately cheating is nigh impossible to prevent in csgo

[hushed spoke]

Yeah of course

[acoustic drum]

Good luck with your game

[hushed spoke]

Thanks 🙂

[ancient adder]

I have a struct with ReplicatedUsing and COND_OwnerOnly but its executing the onrep function on client side not server in blueprints(didnt check in c++), the OnRep function is BlueprintNativeEvent, what am i doing wrong?

[chrome bay]

C++ OnReps never execute on the Server

BP on reps are a hack which is why they do, even though they shouldn't

If you want the Server to run the same code, just call the function manually when you change the variable.

[ancient adder]

For some reason i remember being told the opposite, thanks for correcting my memory

[hushed spoke]

@chrome bay It worked! I set the coordinates client side and made a reliable RPC for the line trace only. Thank you 😄

[fleet viper]

Im basing all my animations on the ai state which is stored in an enum in the ai controller. Problem now is that the client side cant get the state of the ai since the controller only exists on the server. Does someone know a workaround for that?

this code is in the anim class event graph

[winged badger]

replicate the data in Pawn or replicate AIControllers

either way will work, only second one is not recommended as it adds replicated Actors

[fleet viper]

so basically for replicating the data in the pawn i would need to create another variable which stores it and is replicated right?

[winged badger]

yes

[fleet viper]

ok

[ancient badge]

Hello, how do i mirror an action in multiplayer? For example, two players are facing each other. Player 1 spawns a cube on his left side. Player 2 would see this cube on his right side normaly, but i want him to see the spawned cube for him on the left side too.

[marble gazelle]

not sure why you would do that, but instead of replicating the cube actor you would spawn the actor only locally and would replicate the action. How ever this means that you either need to have a cache of cubes to be replicated in order to have the cube spawned on other peers if they join in later or you don't care.
But to be faire I'm not sure what you are trying to do, but if it involves gameplay I would replicate the actors position properly as it otherwise results in 2 different representations of a world.

[ancient badge]

what im trying to do is like in card games, where for all players the map looks the same only that the other player is always on top or the left side.

[marble gazelle]

I see, then just replicate the data, for example if it would be like a card game take an array and this represents the cards from left to right (index 0 -> N) then you can position them where ever you want.

[ancient badge]

Thought about that too but couldn't find a way hot to work with that replicated data yet, maybe i was missing something.

[marble gazelle]

Well you need to know when smth changed and then apply this change to your visual representation.

[ancient badge]

Yeah, lets say i spawn a cube. Thats the moment something changes. So i don't replicate the cube, just the data where he is.
How does the other player know that this cube was spawned on this location? I guess because of a RepNotify for the location part. But how do i tell the other player to start an "event" to create his own cube at that location for his view. Or do i understand something wrong right now^^

[marble gazelle]

No, your system would do smth like Play Card, this would add an instance of CardData into an array for example. Now you have two ways.
PlayCard is a replicated function that will spawn smth according to the parameterrs.
The replication of the array will make you check that an new element was added and this PlayCard is a local function, that will spawn the actor on the one peer calling this function, and the replication will trigger the same logic based on the data given in that array

[glossy plover]

Is there an easy to replicate material parameters? On my characters I have a staticmesh cylinder below them with a material that has a color parameter, when I spawn the character it on the server I set the color on the material. But when clients join they don't see the color change...Even though I had set the replicate component on the staticmesh, i have set replicate on the variable that sets the color etc...

[ancient badge]

If i understand you right, i spawn a card and that card i add to a replicated array. Because that array gets changed the other players get a "notification" that something has changed in that array and calls a function to do something with the information in that array?

[marble gazelle]

No the actor it self is not relevant. the actor is just the visual representation of your card and is not replicated in any way.

Let's say you have smth like this:

USTRUCT()
struct FGameCard
{
  UPROPERTY()
  UMyCardData* CardData; // Comes from a data asset for example
  UPROPERTY()
  ECardRotation Rotation; // Vertical / horizontal, facing up or backfacing
  
};

Then you have an array TArrray<FGameCard> PlayedCards which you can replicate. and depdending on the content of this array each peer can spawn actors. What needs to be spawnd comes from the data object that is loaded from disc

[marble gazelle]

Yes, don't replicate it. Better have some struct with "player colors" and replicate this and then just apply these colors 😉

[glossy plover]

I'm not following? How does a struct help with this? Note that the characters get spawn in by the server before the client has joined. So when the server spawns the character, it sets the color; when the client joins it doesn't see the color update. If I manually update the color on the client then it works; but it should just replicate the material from the start

[marble gazelle]

You replicate the struct and then you can take the colors from the struct, you just need to init this struct with the right values that you want to apply to your material

[glossy plover]

I still don't understand why a replicated struct would be any different from a replicated linear color? When the server spawns the character it generates a random color (say "Blue" for example) and then set a replicated "TheColor" variable on the character as that blue. It then updates the material paramater with that color from the variable.

[dark edge]

Repnotify whatever you need on client to get things setup right

[glossy plover]

The client is not in the game yetat that point though

[dark edge]

Repnotify will fire when they join

[marble gazelle]

because it's cheaper and easier to replicate a struct than some UObject instance^^

[dark edge]

Linear color is a struct

[glossy plover]

Oh i see, so if i update a variable which is repnotify then as soon as a client joins is will run any repnotifys which have been done before hand?

[marble gazelle]

no it will only call rep notify if it replicated smth. it's a notification that you received a change

and IIRC you can be sure that you have received the first values in the actors BeginPlay so if the color doesn't change you can just grab it there.

[dark edge]

Ya

That's what's so great about repnotify

[glossy plover]

Yup that did it thanks

[dark edge]

Same thing with entering relevency range

[ancient badge]

Ok, i think i get what you mean. Lets say the first entry in this array has its location variables on the middle bottom and this ward belongs to player 1. So he spawns an actor with all the fata from the strict on that position. Would the other player not do the same?

[marble gazelle]

Let's assume we have smth like this

+-+-+-+
|2|1|0|
+-+-+-+
|0|1|2|
+-+-+-+

where the numbers are indices.
then you have two arrays

TArray<FCard> Player1Cards;
TArray<FCard> Player2Cards;

The cards them self don't know where they are, this doesn't matter. If the array has at some index a valid object you can spawn smth for it. If it doesn't you keep the slot empty.
where you place the stuff is then fully up to the peer. It will calculate it based on the position (index) in the array

[ancient badge]

Would i not need to tell which array goes on on top or bottom indices?

[marble gazelle]

this is just an example. you can do what ever you want. but it allows you to use indices to specify what belongs in which slot.

you also wouldn't have two arrays like this, you would have one array per player and the "local" player would put it's array always on the bottom for example and the other player would be put on top

[ancient badge]

Sorry if i understand something wrong but if i do it like this. Wouldn't i trade the problem from the location to a problem of setting which player card array gehts on which location?

[marble gazelle]

Well no, as you always know: Local player stuff goes there, remote player stuff goes there

at somepoint you need to specify locations anyway, but this way you always have a context for your decision

[ancient badge]

So in text:" is this array local put it here if not put it there"

[fallow shadow]

sigh

i have delayed this for well over a month now

its time to get started on interpolation

anyone got a good guide/starting point?

[dark edge]

In what context?

[fallow shadow]

movement

i get rubberbanding

[dark edge]

Are you using character movement component?

[fallow shadow]

yes

[dark edge]

Fix the rubberbanding first before messing with interpolation

WHen does it rubberband

[fallow shadow]

when you start and stop moving

like in the period between you starting moving and reaching the max speed

same goes for stopping

[dark edge]

Are you changing max speed at runtime?

[fallow shadow]

nope

[dark edge]

Are you doing anything weird or outside of
Input -> Add Movement Input
?

[fallow shadow]

nope

[dark edge]

Show a video clip with the capsule visible

[fallow shadow]

the last time i change it is in the constructor

[fallow shadow]

give me a hot minute

[dark edge]

cpp only project or are you blueprinting your character class?

[fallow shadow]

cpp only

the only blueprints im doing are in the HUD

[fallow shadow]

also isnt interpolation supposed to be a fix for rubberbanding

[dark edge]

You should first check if a BP character deriving from the engine-provided class behaves the same.

You might be screwing something up like client and server disagreeing on acceleration or whatever

just whip up a BP character and give it the same speed and acceleration stats and see what happens

[fallow shadow]

this is

weird

the rubberbanding suddenly isnt happening anymore

wait lemme check one more time

[ancient badge]

Thanks for your help, still have no clue how this should work🤣

[dark edge]

You can either have the player cameras oriented opposite OR just replicate the needed data and have each client interpret it differently

Specifically what are you trying to do?

[toxic lion]

Thought this may be a better place to ask

Subsystems can't replicate with any real world use right?
For a "manager" or singleton, am I better off just using an actor?
Or chucking everything into something like GameState?
Or is there a better alternative?

[dark edge]

I think people are having the subsystem spawn an actor to replicate through

[toxic lion]

ah interesting

[ancient badge]

All i want that the cards from each player are shows at the bottom and the cards from the other player on the top. Waht i understand is that i need to replicated my data for the cards and let each player place the cards for himself. What i don't get is how i access the replicated variables fromthe other player.

[dark edge]

Do you necessarily want a player to know another player's cards or just the ones they play?

For now, just let then know the cards, so make a few replicated variables on their PlayerState or Pawn like
DeckCardArray
HandCardArray

[ancient badge]

I only want them to be visible at the top

[dark edge]

I'm talking in a cheating context. But that's for later

[ancient badge]

In that context would only when he plays the cards know what it is.

[dark edge]

So for now your goal should be to sync each players card arrays and have each local machine show local players cards in one spot and other player's in the other

[ancient badge]

Yeah but where do i get the Variables from the other players? For my local no problem. But how do i use an array that when i make my blueprints don't know about because the other player sands me them when the game is running? How do i access that array from the other player so i can that his cards to that location?

[dark edge]

Replicated variable on PlayerState is where I'd do it

Playerstate
-HandCardArray(repnotify)

[ancient badge]

So i make for each player a handcardarray and when the round starts i call that repnotify?

[dark edge]

idk what a handicap is

repnotify will fire whenever the array changes

that's when you'd move cards, etc

[ancient badge]

Sorry my smartphone doesn't know what englisch is and is changing some words

[ancient badge]

And how do i know of that array from the other player at start? Clothing changes at the start of a round

[dark edge]

Repnotify

just hook into the repnotify and it'll work

RepNotify fires every time the variable is updated, even the first time (right when you join)

[ancient badge]

Thx i will try that

[humble bane]

Is the server a player when Doing listening servers?

[dawn ledge]

Im trying to make world transitions that wont cause client disconnects in an online session. I started learning about level streaming and I've just discovered the AGameModeBase::bUseSeamlessTravel. It seems like they both do the same thing, except level streaming uses sublevels. How should I choose which one to use?

[dawn ledge]

yes, listen servers act as both a server and a client simultaneously

[humble bane]

Thanks, I see now

[toxic lion]

Does anyone have a simple breakdown as to how you would have an actor handle the replication on a subsystem?

[dawn ledge]

I dont think a subsystem can replicate any properties, but it could feed data into a replicated actor

[dark edge]

I haven't done it yet but something like subsystem spawns actor based on world netmode and actor registers itself on clients to their subsystem??

does a subystsem even have a netmode?

[thin stratus]

They are UObjects iirc

Cause I think all of their respective parents are also UObjects

GameInstance, World

LocalPlayer

So usually they don't replicate anything. If you need something to exist on both ends you can just use it's BeginPlay to register in the Subsystem

And EndPlay then to unregister

Aka, add and remove to and from array

[dark edge]

Does a subsystem seem like a good fit for something like a global projectile system or would that maybe work better as a component on GameState?

[thin stratus]

I hope we are talking about Gameplay Subsystem

Honestly, Subsystems usually hold the same type of code that their parent would usually hold

Just encapsuled

If you wouldn't put it into a UGameInstance, you wouldn't put it into a UGameInstanceSubsystem

UWorldSubsystem gives you something more generic in the scope of the World

[dark edge]

If you were to make a global projectile system with projectiles as just raw data, where would you put it?

[thin stratus]

So you could make that a Projectile Pool or so if you want

[dark edge]

Just
Tick -> foreach ProjectileStruct -> update

[thin stratus]

You could, there is just not replication in it

[toxic lion]

Okay still a bit confused then
is it
Subsystem spawns an actor that actually holds the replicated data?
And the subsystem just performs actions, and retrieves data from the actor?

[thin stratus]

If you need replication it's probably better on a replicated actor of sorts

[toxic lion]

didn't mean to reply there. more of a general question

[dark edge]

Yeah basically the subsystem does net stuff through the actor, but then it begs the question, why isn't this all just wrapped up in that actor instead.

[toxic lion]

🤷‍♂️
yeah just seems like I'd be writing the same code twice. once on the subsystem, and once on the actor
Or at least writing two functions, one to pass onto the other

[dawn ledge]

Yeah, I have also made a gamestate component that acts like a subsystem but has replicated properties

[dark edge]

Yeah that's what I did before subsystems. I guess I'm just a sucker for
Get MySubsystem -> do thing

[toxic lion]

yeah, so maybe a GameState component to act as a singleton is a better pattern?

[dark edge]

I think it's up in the air really, do whatever floats the boat

Literally in my case, got a BuoyancySubsystem lol

Or rather, FluidDynamicsSubsystem, it does global buoyancy and drag for water and air.

[toxic lion]

arlighty. thanks for the input. let me play around with it a bit and see what happens

[dawn ledge]

Can anyone explain the differences between level streaming and seamless travel?

[bitter oriole]

They're fairly unrelated things

Level streaming = load/unload part of the current level

Seamless travel = once connected to a remote server to play online, change level on the client without a giant blocking loading screen

[dawn ledge]

okay, that makes sense. I was adding other worlds into the persistent level as sublevels, so it seemed like just another system to transition between worlds.

So it seems like I could use both to accomplish the same thing

Why would I choose one over the other?

[dark edge]

Any way to connect to a remote server without a giant blocking loading screen?

[static sable]

hi, in an experimental RTS I use behavior tree to move my units. As long as I send move command to server everything works, but the unit movement is not smooth. Controller doesn't exist for my unit (actor) on client, neither does behavior tree. So how to calculate movement on the client and get movement done smoothly?

[bitter oriole]

None

[bitter oriole]

You will use seamless travel for changing levels (and reinitializing game mode, game state, etc) in a multiplayer game

Level streaming is more commonly used for bringing up and down parts of a large single player level

[dawn ledge]

Oh okay, thank you for explaining it to me

[pallid mesa]

btw for those interested today I posted a new article about how to implement a better synced clock in a non destructive manner

can find it in pinned comments in this channel

[static sable]

let me put it the other way... how to sync client with server, when there is no controller on client's actor present to do the behavior tree logic?

[quasi tide]

The behavior tree logic is done on the server and that gets replicated

[static sable]

hi, thx, yes I get that part and it works well, but actor's movement on client seems to be out of sync - it's not smooth. So client needs to do its calculations on its own and only get corrected by server from time to time

[dark edge]

You don't sync the brain, you sync the body

[humble bane]

am having an issue where I spawn a moving rock , on hit its supposed to cast to third person character, but the casting always fails, the casting actually works with an AI but not multiplayer, any help is appreciated

[dark edge]

Why are you destroying self when you still have stuff left to do.

[humble bane]

yea makes sense, i will fix that

[graceful flame]

That's some seriously deep life advice right there.

[dark edge]

https://tenor.com/view/keanu-reeves-bill-and-ted-gif-5247626

[stiff nebula]

i've a replication issue with my client character where he shoot on the Y axis / play sounds through some function, server hears the sound and also is able to shoot on the Y axis, any help here?

[graceful flame]

Can you share a screenshot of the blueprint?

[stiff nebula]

ignore the comment, a bit outdated on what the bp is supposed t odo

so basically i can get linetrace working on any axis when i'm on the server, but for some reason the client cannot access the Y axis and just shoots on the x axis. the other issue i've got is that the sound does not play clientside either, but plays on server and i'm not sure why. for reference, this is being called through an event dispatch that looks like this

'on use item' is the event dispatcher

then it's used here after the sphere collides with the player and it attaches the gun to a socket

[stiff nebula]

which takes us back to here

[dark edge]

Bruh that is all over the place

[stiff nebula]

yeah...

[dark edge]

OK so you're trying to do NON predicted guns?

Is this a gun or what is thi

[stiff nebula]

a gun

what's predicted gun supposed to be, sorry im new

[dark edge]

First off if you're new you sure picked a hard thing to get right

but it's doable

[stiff nebula]

i've attempted this a couple times before and gave up, this is my third attempt haha

[dark edge]

so basically right now, your setup will do nothing on the clients computer until ping ms later

Do your projectiles do anything fancy like bounce or curve or are they just bullets?

[stiff nebula]

no projectiles, just hitscan

[dark edge]

ok so I'd do it like this. You can do it all in the weapon if you set the owner of the weapon to the pawn that equips it.
Pawn
Input -> Get Weapon -> Call Fire

Weapon
Fire -> Hitscan -> Run on Server Event
Run on Server Event -> double check hitscan if you want but ignore this for now -> Do replicated stuff (apply dmg, etc).

That's basically clientside hit detection

OR if it's super slow paced and some lag isn't the end of the world

Pawn
Input -> Get Weapon -> Call Fire

Weapon
Fire -> Run on Server Event
Run on Server Event -> Multicast Event
Multicast Event -> Hitscan -> Do Cosmetics -> Switch has authority -> Do replicated stuff (apply dmg, etc).

[stiff nebula]

not sure how setting owner works, is that about all i've got to do in that regard

[stiff nebula]

i'll probably go with this, im trying to make a competitive shooter haha

[dark edge]

You should be doing Equip on the server so whenever you Equip you'd set the owner

You aren't gonna make a competitive shooter with BP only

At least, not one that can't be cheated at trivially

[stiff nebula]

well, just trying to get to the mvp stage

[dark edge]

But if that's not an issue, do the clientside hit registration if it must be snappy

Basically it goes like
Hey Mr. Server, I hit that guy
OK Mr. Client, I'll let evryone know.

With optionally, the server double checking to make sure you're not talking out your ass.

[stiff nebula]

sounds good, here's my current order -

this is my fire, not much to set up

[quasi tide]

If you're doing a competitive shooter, it definitely isn't "optional" to have the server verify the shot was even possible.

[dark edge]

You're already waiting ping ms at this point

[stiff nebula]

then i go to here with the fire and then it's the hitscan after that

[dark edge]

Well yeah but you gotta make it work before you make it bulletproof

[quasi tide]

im trying to make a competitive shooter haha
Why I was responding

All of my games are co-op, so I just do client hit detection 😅

[stiff nebula]

cool, will keep that in mind

[stiff nebula]

ah i see what you're saying

because it gets replicated right?

i think i need to do that though because it goes from the character BP to the gun BP, doesn't replicate without that for some reason

[dark edge]

Yeah. To start with, do clientside hit reg
Input -> Do shot + cosmetics -> Tell server about shot -> Server updates replicated values -> Server tells everyone but you to do cosmetics

[stiff nebula]

or atleast, i don't know how to replicate the shot without it haha

[dark edge]

Start by making a run on server event in the GUN that passes over info (hit result at least)

[graceful flame]

How do you do that last part "server tells everyone but you to do cosmetics".

[stiff nebula]

gotcha, will try doing that

[dark edge]

I think there's a multicast skip owner, or you can just check if owning client on the recieving end of that multicast and bail out

[graceful flame]

ahh okay

[dark edge]

Welcome to the toughest part of making a game, making the damn thing work in MP without lag all over the place.

Making it work without visible lag and with server authority is even harder

[stiff nebula]

since i started trying to do game development, i've come to appreciate what other developers do in regards to multiplayer replication, i am absolutely lost in this part haha

[dark edge]

Then maybe don't start with a competitive shooter unless grinding away for years is your style.

[pallid mesa]

it's a way to learn

[stiff nebula]

well, prior to this i've done some single player stuff

[dark edge]

I've done this stuff for like 8 years and I wouldn't want to try a competitive shooter. Although I am trying to do multiplayer vehicular combat with projectiles so I'm a glutton for punishment too I guess.

[stiff nebula]

just a singleplayer fps where u shoot bots running at u

[dark edge]

I'm lucky in that I don't need prediction as my vehicles are fairly slow responding.

[pallid mesa]

you send the input to the server?

[dark edge]

ya

well some condensed form of it.

[quasi tide]

Only let people get in a vehicle if their ping is < 10ms. Problem solved. Easy.

[pallid mesa]

my vehicles are client authorative with some server validations lol

[stiff nebula]

well shit, seems like as soon as i just did this

it started working lol

[dark edge]

Mine are fully designed and built at runtime so yeah, don't wanna go down that road lol

[pallid mesa]

both ways are a PITA, vehicles, in general, are a PITA

specially when you have multiple players with vehicles

[stiff nebula]

i think now the issue i may potentially have is with damage, the gun at the moment just does knockback and i was just trying to get that working at the very least

[pallid mesa]

yeah the whole input thing

[dark edge]

As far as neworking goes I just replicate control variable state and physics and it just works.

Sure you wait 30ms to turn but it's a bigass tank, you're gonna wait 30ms to turn anyway

[pallid mesa]

ye

[dark edge]

Although stuff like this is possible so who knows if lag will be a huge issue
Very old video but I found it when trying to track down my dedicated server testing videos.

15,000 hp awd bike with a propeller shoving it into the ground makes for some broken necks

[pallid mesa]

that looks fun as hell

[fallow shadow]

Why would i ever want to set a variable as UPROPERTY(Replicated) when i can just change it on server through a RPC?

[dark edge]

Stateful

What if you joined a game late

[graceful flame]

Say you have a room with a light switch. The switch is off by default and there's an RPC to turn it on. Player A walks into the room and turns it on. The light is on and both Players A and B see that its on. Great.

Now Player C joins the session and enters the room. The light is off for Player C because its still using the default value because the RPC happened before the were in the session.

[dark edge]

You missed the RPC, what is your variables value?

[fallow shadow]

Ah

That makes a lot more sense

much appreciated

[dark edge]

Honestly if you can do it with RepNotify, do it

It's so good

[graceful flame]

There's other reasons too, like an RPC can just simply get dropped due to packet loss. But a replicated variable should update (eventually).

But then its not perfect either, the custom event that runs on the server to set the replicated light switch bool to True might get dropped due to packet loss and so it never changes in the first place.

[dark edge]

Reliable my dude

[graceful flame]

You can use reliable, but then I've heard that also has the potential to overflow and cause clients to disconnect

[dark edge]

Well yeah if you send tick input reliable

SendAimDirection should not be reliable. Interact() should be.

[graceful flame]

So maybe only use reliable for things that have to absolutely work no matter what, such as ending the round in a cs go match or something.

[dark edge]

That should be a repnotify on GameState probably

[graceful flame]

Sure, bad example.

What would be a good use case for reliable then?

[dark edge]

Anything transient and important

[graceful flame]

Something that happens not often but MUST happen for the gameplay logic to even work.

[dark edge]

Interaction, Jump, Shoot

Stuff you do a few times a second, not hundreds

[graceful flame]

So if Jump is reliable and there's 10 players all jumping up and down isn't that enough to cause an overflow?

I guess it depends and is worth testing.

[dark edge]

10 x 1 x 5/sec is like 50 bytes a second

I mean there's overhead but its not like sending 10 vectors every frame

Fortnite burns about 15 kB/sec so 50/15,000 is like 0.3% of your bandwidth

So like nothing

[graceful flame]

good to know

[dark edge]

While sending just 1 vector a frame is like 700 byte/sec

[humble bane]

am having an issue where I spawn a moving rock , on hit its supposed to cast to third person character, but the casting always fails, the casting actually works with an AI but not multiplayer, any help is appreciated

[dark edge]

You destroy self before doing stuff

do that last

Not saying that is your problem but thats A problem

[humble bane]

oh wait, i didnt send the new one

[dark edge]

That's your problem

What are you trying to do here?

why are you doing clientside hit detection for this

[humble bane]

The player is throwing a rock, when the rock hits another actor or player, i want that actor to play a knockdown animation

[humble bane]

event hit is only local?

[dark edge]

Pass the hit struct over in the Run On Server event.

if you want clientside hit detection

OR only do it on the server

either/or

you either need to gate by LocallyControlled or Authority after Event Hit. If you do serverside hit detection you don't need any RPC .

[humble bane]

wait like this?

[humble bane]

this is what i did but casting is still failing on client and server side

[graceful flame]

9 times out of 10 there's a way to avoid casting

[dark edge]

Print the hit actor's display name

make sure it's actually hitting what you think it's hitting

[humble bane]

hmm really

[humble bane]

k

[dark edge]

Don't worry about that right now

lol

[graceful flame]

Maybe you can use an interface, an event dispatcher or you can use tags.

I like to use tags because its already built into the default Actor class. I just tag my actors as needed, "Enemy, Destructible" for example. Then during an overlap event or hit result, I can use the actorHasTag node to check for any tag(s) I want and do stuff to the actor after knowing that its the right one without having to cast. Ex: Projectile hits something, break hit result, get hit actor from hit result, if actor has tag "Destructible" then run custom event that does stuff without having to cast.

[humble bane]

weirdly it saying am hitting the rock, not sure why, but when i tried casting to an AI it worked

[graceful flame]

or you could use an interface and do it that way, also works well

[humble bane]

yea i would need to learn that

[dark edge]

Aren't you supposed to be hitting a character?

is the rock a character?

[humble bane]

no

[dark edge]

Dude your naming convention is mega confusing. WHy is all this called RockSpawn, when you don't spawn a rock

[humble bane]

yea good point, i spawn it in my character BP, bad name

[dark edge]

How many do you spawn?

[humble bane]

@dark edge it looks like my rock has an hit event even when it doesnt hit anything, am thinking the server rock is colliding with the local rock, is that possible (even tho the server rock is invisible from local side)? if so that would explain why the name of the actor printed was my rock

[humble bane]

its just one rock

[dark edge]

If it's a replicated actor then yeah it's totally possible

why are you spawning 2 rocks

Show how you're spawning it

[humble bane]

the top one is the local side (it also fires of the server side)

also strange because my other rock projectile doesnt have collision problems

[dark edge]

What the spaghet is going on here

lol

This is gonna take a minute

Why are you doing all this local/server stuff, you're not gonna have prediction anyway

why not just input -> server -> do replicated stuff

[humble bane]

idk, was just following guide

[dark edge]

Do you have a base ability or is every ability a big pile of wires like this?

[fallow shadow]

btw how would i execute some code on the server without invoking an RPC

[dark edge]

Is this hard coded into Character?

[dark edge]

You wouldn't

The only way info goes from client to server is with RPCs

[humble bane]

the first rock fires off an event hit mid air, the second rock later on acts normal, so very confusing

[dark edge]

So are you spawning 2 rocks or 1 replicated rock?

[humble bane]

i dont think so, you mean the replication stuff? no not really, i just started it, if you mean the abilities, yea i have been programming it like that for a while

[humble bane]

a replicated rock and a local rock

[dark edge]

They are probably colliding

[humble bane]

yea, i spawn the rock for the server side but it wasnt showing for the client so i spawned it locally as well

[dark edge]

How many abilities are you planning?

[humble bane]

7 but only 2 needs casting i believe, the other one casted fine, am guessing since it just a capsule trace inside the same third person BP

[fallow shadow]

No no i dont mean sharing info between server and client, just running some generic code on the server

something like changing a map completely after a certain amount of time regardless of what the client(s) do

would a HasAuthority() check in the gamemode code suffice?

[dark edge]

Yeah the server is running the engine like any other

HasAuthority means you're the boss, either server or standalone or clientside authority stuff (i think)

[fallow shadow]

epic

[twilit radish]

There’s no reason to use HasAuthority for the GameMode because it only exists on the server 😄

[dark edge]

Say you had a replicated actor, which would be most things in your game except HUD/UI or GameMode. You'd gate stuff by HasAuthority if you want it to only do something on the server, and it could possible happen on any machine. Like hit detection.

[graceful flame]

So you’d pretty much want to always use hasAuthority when doing onBeginOverlap?

Say the character steps onto a floor switch that opens up a trap door.

[twilit radish]

Depends on if you want local prediction or not I suppose.

[graceful flame]

It would be something like TrapDoor->onBeginOverlap->hasAuthority->overlappingActor is character…

That would work because the TrapDoor and it’s switch are level actors and not possessed by a real player. Right?

[dark edge]

Yeah you might move the gate so cosmetics happen locally but yeah

Every replicated actor exists in multiple worlds at a time (servers and other ppls)

[graceful flame]

Yea

[dark edge]

Like maybe you show the trap slamming shut and play sound and spawn particles on overlap, but gate by HasAuthority before applying damage. Or don't, if you have some damage prediction setup. Depends.

If you gated right after overlap, you'd have to replicate the state of the trap or some event to do the cosmetics

[blissful saffron]

Anyone know where Lyra's EOS handling is located? Trying to find and emulate how they handle hosting and joining.

[blissful saffron]

Looks like it's in CommonUser instead of OnlineSubsystemEOS 😄

[grave lynx]

Hello, guys, I'm trying to spawn multiple players with spawn actor node. I don't have any issue with the location, but the rotation is working only for the server. I'm using the gamemode for spawn them

[gilded merlin]

Hi guys, any idea why when i'm doing rpc call from client to server with scene component variable, scene component variable is okay on client, but on server it seems to be null (display name is blank)

Other variables seems to replicate just fine

IS valid node on server returns false

[winged badger]

its not part of the Actor CDO and not replicated?

or its a component on a non-replicated Actor that has been spawned in runtime

either way, Component doesn't need to be replicated to be net addressable

it requires that A - its owner Actor is net addressable and B - Component is either stably named (so a Component not added in runtime) or that Component is replicated

for Actor to be net addressable it needs to be either loaded from level, replicated, or deterministically named on all machines with IsFullNameStableForNetworking returning true

(third condition is how actors loaded from level are net addressable by default - their names are serialized with the Level and IsFullNameStableForNetworking returns true if Actor has RF_WasLoaded flag)

[gilded merlin]

@winged badger Thanks a lot for very detailed answer.
The variable that doesn't get replicated is in fact static mesh, spawned in component via actor's construction script.
Actor is replicated.
Even tho I have added set is replicated node in construction script, it didn't help, but I'll have to debug it a little bit more 🙂
Appreciate your help dude, thx.

[winged badger]

you can replicate a pointer to the Actor and then have each machine just access its local non net addressable component from there

[gilded merlin]

Is it doable via blueprints? How do I do that then? Even tho, I'd like to resolve the problem that I have first, just to understand what's going on here.

[winged badger]

instead of sending ValveComponent you send ManualSteer reference and then you do ManualSteer->ValveComponent on the other side

this wouldn't work if you had an array of Components and didn't know which of the Actor's Components you need, but in your case it will work just fine

[gilded merlin]

That's a way to workaround this, but unfortunately in my case, I send scene component, because I can push there static meshes from many places, and I need to know specific static mesh. If I had there manual steer, I wouldn't know which specific mesh did I send

[ancient badge]

is a listen server automatically replicating actors?

[gilded merlin]

What do you mean exactly?

[winged badger]

you can send a reference to a StaticMesh asset just fine, your problem is StaticMeshComponent ref

[gilded merlin]

I meant StaticMeshComponent

[winged badger]

you can deterministically name them when you spawn them

and use SetNetAddressable(true)

[gilded merlin]

I guess that have to be done in c++?

[winged badger]

by name them i don't mean variable name, but what you'd normally see in outliner name

blueprints can SetNetAddressable(true), but don't know off the top of my head how you'd name the component as you spawn it

[gilded merlin]

That's for all the leads Zlo, I will try to dig into it a little bit deeper

I'll let you know when I resolve that, thx mate, appreciate your help a lot

[ancient badge]

what i mean is that my listen server and my client both spawn something, but the client sees what the listen server spawned too

[gilded merlin]

I believe it depends if actor that you are spawning is set to be replicated, and if is it set to be load on client.

[woeful ferry]

If you want to spawn an actor locally, just dont set it to replicate

[ancient badge]

you mean "Componentn Replicates" under the "Details" Tab from the actor right?

[woeful ferry]

no

that one

[gilded merlin]

@ancient badge I suggest you to watch those yt series, it's short and really well explaining multiplayer basics https://www.youtube.com/watch?v=TEojA3VBXG8

[ancient badge]

thanks i looked at the completely wrong section xD

[gilded merlin]

From what I found, it looks like bp can't set net addressable on components :<

[winged badger]

huh, remembered it wrong

you just need a single c++ function here

[woeful ferry]

Is this how you link up components?

client/server

[winged badger]

to create a component of type, name it as it creates it, attaches it, registers it and sets it net addressable, then returns a pointer to that component

[woeful ferry]

For components created in runtime?

[winged badger]

that was for Mleko

[woeful ferry]

Ah, i'm just curious

[winged badger]

but yes, blueprint does a terrible job at adding components

[woeful ferry]

Been thinking how you replicate components you have created dynamically

[winged badger]

SetIsReplicated(true)

that one is straightforward

making them net addressable without replicating them is better for performance, but also a little bit more complicated

[woeful ferry]

But the creation of the components need to be multicasted/onrep? Or is it handled if I create one on the server

[winged badger]

if replicated, only the server needs to make one

and if clients did it as well they would end up with a pair of them

[woeful ferry]

Ah, thank you! 😄 Not a thing I

I'm using right now, just curious

[hushed spoke]

Hello everyone, I have the client run this blueprint, but it doesn't reach the run on server event

[gilded merlin]

Is client owner of this blueprint?

[hushed spoke]

no

[gilded merlin]

I guess that's why it isn't called on the server

[hushed spoke]

alright, thank you

worked like a charm 🙂

[gilded merlin]

You welcome 🙂

[harsh lintel]

if I don't have a default pawn on the game mode, is there a "correct" way to spawn a pawn and possess it so there aren't any network errors? or is this good enough?

[dark edge]

Override one of the functions that chooses the pawn

[harsh lintel]

I'm trying to find how to override HandleStartingNewPlayer

All I do is to spawn the pawn but I don't know if I'm supposed to possess it there too

[dark edge]

I think that event is a one stop shop, you're basically skipping all the find start spot, choose pawn, etc stuff.

[harsh lintel]

hmmm

[dark edge]

You're basically saying "I'll do it"

so ya you'll want to possess

[harsh lintel]

I also overrode "FindPlayerStart"

[gilded merlin]

After I did what you suggested, spawned and attached scene comp in c++ and set net addresable and is replicated in code, it finally works 🙂 Really appreciate your help, thanks a lot

[winged badger]

few notes

you can do USceneComponent::StaticClass()

you can also do Component->IsA<USceneComponent>() to see if its a scene or derived from it

[twilit radish]

NULL intensifies

[winged badger]

SetNetAddressable() is redundant alongside SetIsReplicated()

const FString ComponentName = "MyScneComponent" + FString::FromInt(Counter);
USceneComponent* NewComponent = NewObject<USceneComponent>(Owner, SceneComponentClass, FName(*ComponentName));
// attach and register
NewComponent->SetNetAddressable():
Counter++;

is how you would do it without making it replicated

not that it hugely matters, just fyi, Counter is a member int32 variable

[fathom aspen]

But it's used by a competent #cpp developer ^^

[rocky kestrel]

This is from multiplayer replicated turret. I shoots ray and should check id from player. It always returns null.

This is from controller and it calls beginplay input of that id.

This is from player character

[dark edge]

Have you printed PersonalID in characters to make sure they're correct?

Why do you have all these delays

just expose PersonalID on spawn and set it when you spawn the char.
Load -> Spawn -> Possess

[rocky kestrel]

yep. input press j -> print personal id ->> prints always correct "username"

[fathom aspen]

I'm wondering how the server RPC is not getting droppped, but you prolly calling it from server, so it's not needed

The turret is not client owned, so you can't call server RPCs from it

[dark edge]

Why is that a run on server event

[worn wagon]

Is the vanilla sessions interface good? I have heard there are some plugins like advanced sessions that improve upon it

[dark edge]

Depends on what you need

Yes and yes

[worn wagon]

Phrased another way then, what do these plugins offer over the vanilla implementation?

[dark edge]

More stuff with friends etc, more stuff exposed to BP

[worn wagon]

Can I say, display a server name, current and max player count, ping, current map, and gamemode with vanilla?

[dark edge]

Not sure, have you tried?

[worn wagon]

Oh BP stuff

No I was just about to get into it

[dark edge]

You can at least get player counts etc

[worn wagon]

Hmm alright

[rocky kestrel]

Made things little bit more clear. This is from player controller.

that second from third person character BP and it prints correct

This is debug replicated actor only prints players ids and it print only null

so problem is that server doesn't know players ids? only locally players know their?

if I make that "Output Get" replicated in player controller. Then J print doesn't print anything and server neither.

[fathom aspen]

Honestly this is all a bad code structure

Having same property in two different classes, GettingAllActorsOfClass, Running BeginPlay without guarding with authority(you prolly don't need it here), Too many delays

PlayerID is a string too

You got a property already in PlayerState called PlayerId

[rocky kestrel]

But PlayerID in this case is username+password because later on database login

[fathom aspen]

And there's where such property should be

[rocky kestrel]

Okay!

[fathom aspen]

Still it should be in PlayerState. No reason for it to be all over the place

[rocky kestrel]

Okay I try that

[safe vortex]

How the hell do you even properly replicate Pawn Rotation without a Character Movement

thing just doesn't work

[sinful tree]

Replication only goes from Server -> Clients.
Input Events (Like your InputAxis Turn Left / Right) only activate on the client.

You need to do a "Run On Server" event to tell the server that you want the rotation changed.

[safe vortex]

lol I've done that but alright I'll check

Nope

locks in place, doesn't rotate

Multi-cast makes it so only local sees it, rotation on other client is still locked forward

Actor is replicated as well

[dark edge]

To start with, are you sure your float is getting to the server fine?

also WTF is that math, why are you getting base aim twice and all that. WHat are you trying to do?

[dark edge]

Is actor replicated, has movement replication checked, is component replicated?

wait a second

[safe vortex]

I can't have movement replication checked because I'm doing a focused heavy physics game

and movement replication causes jitters when hitting into other physics

[dark edge]

OK please explain in plain English what you're trying to do here

[dark edge]

Then why would anyone else see the thing move? You're not replicating movement or any other variable so why would they see it move?

[safe vortex]

I'm creating a physics type game. I am not using the normal Character Movement system. There was a way to make physics run better on the server by using fixes by Rama's techniques

https://forums.unrealengine.com/t/video-player-controlled-replicating-physics-movement-simulating-physics/7302

Something similar to this

[dark edge]

I have a multiplayer physics game too. What are you trying to do here? Gameplay wise, you're making some star move around?

[safe vortex]

It's a space game where the player moves in space. Acceleration from boosts, interacting with meteors and what not.

[dark edge]

That's exaclty how replicated physics works

but you're not using physics, you're directly updating the rotation.

[safe vortex]

That's not the problem.

Normal Character Movement with Replicated Movement causes massive jitters with physics interactions (player gliding into a meteor)

and even players going through it

[dark edge]

So are you using physics only or physics + CMC or what?

[dark edge]

That's not what Rama's approach does

[safe vortex]

plus unchecking replicated movement, fixes the problem

but then character rotation no longer works

Well his method is of course C++

[dark edge]

His method does no direct sets. It's all forces and torques.

You're adding forces then setting transforms all over the place.

[safe vortex]

And I do such that with my own Ability SYstem, the movement isn't an issue

and fixes

[dark edge]

Read over his approach.

1. Client runs physics on their end, sends data to server(transform and velocities)
2. Server replicates that data out to everyone but that client.
3. Other clients add forces to proxies to get them to smoothly match the state from server.

[safe vortex]

I set ONLY the transfroms in hopes to fix the rotation issue

Which I've been unable to do

Physics replicates fine, matches correctly

I just cannot replicate player rotations

[dark edge]

Sure you can, people do it all the time.

For one, ControlRotation isn't gonna be a thing on other clients

I'd back up and start with a super simple proof of concept. Get a cube to fly around and rotate and sync those up.

[safe vortex]

Add Controller Yaw Input didn't work. Grabbing actor rotation and putting it into a replicated variable didn't work. Replicating Controller Yaw on server/multi-cast didn't work. Setting rotation from said replicated yaw variable didn't work

[dark edge]

Sending a transform over certainly would work. You need to send a transform and 2 vectors per frame (your transform, velocity, angular velocity)

Then you replicate those out

then on clients, you smoothly add forces and torques to the physics for all characters but your own

[safe vortex]

Sending the transform works yeah

as I did show

that's me rotating left

but the actor itself never moves

[dark edge]

So for a character
Tick -> LocallyControlled? -> True -> Do Physics -> Send PhysicsState(Run on Server, unreliable)
-> False -> Do Physics Smoothing using PhysicsStateReplicated

SendPhysicsState(Run on Server) -> Set PhysicsStateReplicated(replicated)

Rama's is basically the same setup as the default physcis replication but client-authoritative.

Dig into how the normal physics replication works, there's some heavy math in the smoothing

[pseudo merlin]

hi all, I have replicated actors in my game that are weapon pickups. I'd like to rotate them for a visual effect on each client independently, but even with replicate movment off they copy the servers rotation. Is there a way to override this behavior?

im tempted to rotate them on GPU, but wondering if theres something im missing here

[dark edge]

Are you sure they're copying the servers and not just doing the same thing because taht's the default?

[safe vortex]

Again, the physics hasn't been the issue. I replicate them just fine

[dark edge]

physics includes rotation

[safe vortex]

The rotation of pawns is the issue

[pseudo merlin]

the movement is jittery like default ue4 movement replication is

ah i think i solved, the root component was set to replicate

it was a mesh which maybe has some logic to auto replicate location or something

[safe vortex]

lol so Add Controller Yaw Input never replicates

and doing repnotify with input works with setting a transformation

[dark edge]

Yeah add controller yaw modifies ControlRotation which is private between client and server as it's a property on the PlayerController. Get base aim does some hackery but yeah the whole ControlRotation setup is janky.

[vivid sparrow]

basically I have a credits system in my player state but it's always reading null whenever I get the player state off the owning player

[bitter oriole]

Probably that widget doesn't have an owning player - widgets should never be replicated

[vivid sparrow]

i'm not trying to replicate the widget, it's just part of a larger HUD class that gets added to each player's viewport

it adds successfully but it doesn't get the player state off the client, only the server

[bitter oriole]

Probably it just didn't replicate yet then

[vivid sparrow]

does player state even replicate? i thought it was just specific to each player

that i add

[worn wagon]

player state is replicated, the player controller doesn't

[bitter oriole]

Yes

Eventually

Of course you can't rely on PS being replicated at any specific point in time

Might be 2s after level load, 5s...

[dark edge]

Is this the local players player state or another clients?

[vivid sparrow]

weird, I added a delay of 2 seconds, and it worked, but it read the saved amount of credits from the individual Player State, upon the level loading it's always reading from the initial player's saved amount (being 10 credits)

[vivid sparrow]

local player's

unless i shouldn't store credits in the player state since the initial amount it would load in would be replicated across all clients anyways

[worn wagon]

I'm getting a crash error and I really have no idea where to start. The error is:
Assertion failed: PIEInstanceID != INDEX_NONE [File:D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\LazyObjectPtr.cpp] [Line: 22]
It happens after I try and host a listen server via a main menu level and load another. The level loads and the character spawns, but then it instantly freezes and crashes with that error. The map plays fine on its own, is there some extra setup I need to do? This is the code I'm using inside of a button click function to swap maps.

GetWorld()->ServerTravel(URL);```

[dark edge]

Credits should be in player state. You just have a race condition.

[split siren]

If I wanted to avoid using default replication for character movement and put all movement data needed for replication into a custom struct, what data would I need to put there?
I have FRepMovement, but the character movement is not as smooth as with normal replication.
I skipped RepRootMotion because I am not using any advanced animations with root motion. Is ReplicatedBasedMovement important? It was always 0s and false from casual debugging.

[vivid sparrow]

what if I want to save individual credits amounts between players? if the player state is replicated across both players then it's going to read the same amount basically

unless that's up for me to improve that lol

[dark edge]

Everyone has everyone's PlayerState. There's an array of them on Gamestate

[vivid sparrow]

mm alright

[dark edge]

You just don't have other ppls PlayerController

And may or may not have their pawn depending on relevancy

[vivid sparrow]

the players do have their own individual player states when I add the delay of 1 or 2 seconds, I don't get a null player state since I assume it just has enough time to set the player state in, on event construct it's called immediately before clients are assigned a player state, at least I assume

adding the delay of 1 or 2 seconds solved it for me

[bitter oriole]

Of course it could be 3s

Or 20s

[vivid sparrow]

yeah, my prof doesn't use a delay at all which is weird lol, which made me think I was doing something wrong

i'm calling it at the exact same time too

[bitter oriole]

You can not assume any timing in MP

Instead, build your code to not need any

[vivid sparrow]

yeah since magic numbers are bad lol

[dark edge]

Does anyone have a flow chart of what is guaranteed to exist before what else? That would be very handy

[vivid sparrow]

that would indeed be very helpful lol

[bitter oriole]

TLDR: nothing

[quasi tide]

When it comes to networking, I don't think there really is one.

[bitter oriole]

Assume nothing, build everything to withstand null pointers

[fathom aspen]

To the bottom, see if it helps: https://forums.unrealengine.com/t/assertion-failed-pieinstanceid-index-none/563742

[dark edge]

I mean there's certain things. I'm pretty sure HUD implies player controller

[worn wagon]

I don't have any landscapes added though

[bitter oriole]

This isn't multiplayer related

HUD is purely local

For actually replicated classes on client? There's not much that's a sure thing

[vivid sparrow]

from what I understand it's Constructor -> PostInitializeComponents -> NativeConstruct but I don't think that helps in this case lol

NativeConstruct is like the BeginPlay of widgets idk

[worn wagon]

I'm just updating unreal rn, but I'll try it. I already found some things before talking about landscapes and the third person project having this issue, but I am using neither

[dark edge]

Nah. I mean how many?

[bitter oriole]

Probably not

In any case, do it, test it, and when your game goes closer to release, anything can be optimized

[dark edge]

That's nothing. They're not checking on tick right?

Even if they were checking on ticket probably wouldn't even be a big deal

[glad escarp]

Hey guys. Asked in UMG already but I wanted to also try here since replication might not be something that the UMG experts would be versed in. I'm trying to replicate changes to a world space widget. I have a simple computer terminal system working pretty well but I want other players to be able to see what the interacting players are typing on the screen. Any ideas about where start looking?

[fathom aspen]

Replicate the text being typed down. OnRep->Show the text to the UMG widget

[glad escarp]

Ah, rep notify. Rad. Thanks Wiz

If I'm adding a child to a scrollbox will that work the same way or am I gonna have to figure out a way to route a server replicated event through the using player to add said child widget

[fathom aspen]

ScrollBox is part of the UMG widget so it's client only. Every connection would have to do that on his own. So you have to do it OnRep too when that said replicated "action" happens

For example. On "Enter" key is hit you add a scroll box. So you would call a server RPC that sets bHasPressedEnterKey to true and in the OnRep you add the scrollbox to the widget

[glad escarp]

ok. Yeah right now the way the terminal works is when you hit enter, it commits a string to a new widget which gets added as a child of a scrollbox. Simple chat type stuff. I just didn't think you could do a server RPC from an actor that isn't directly owned by the player, aka a pawn.

This terminal is a separate actor that takes input from the player after the PlayerCharacter BP has input and movement disabled

[fathom aspen]

It's owned by the controller which is owned by the client(player in your terminology). Ownership is checked until you get to the outer most owner

[glad escarp]

ok. Thanks. I'll work with this. Thanks for pointing me in the right direction

[ripe basin]

Any tips on working with Steam API? I have to run a build and then share it out to another machine and separate Steam Account every time I want to test something. Is this as good as it gets? lol

[dark edge]

You can test on Steam without distributing on Steam right?

[ripe basin]

Yeah, Standalone works fine for 1 Player - But anything past that I have to build and test on multiple machines.

[dark edge]

Get multiple machiens

or some friends

[ripe basin]

So in this instance, I'm trying to troubleshoot lobby / leaderboards.

I know, I was specifically asking if there was another way instead of having to run a build and share it out. lol

So I'm guessing no

[dark edge]

You can just launch the uproject

if you have engine installed on the machine

That's what I do, it's like 5 seconds from submit to source control to server launching new "build"

server being a shitty laptop

[ripe basin]

It's mostly the second Steam Account thing, not the actual launching.

Like if I run a dedi + client, it still only uses 1 steam account on the machine, so it kicks the client out of the session.

I'm wondering if I can maybe force the initial server launch to be some kinda universal account, then the client uses my normal steam account.

[dark edge]

I'd just make another account, you'll want it for the company/appid anyway

I'm not sure a dedicated server needs an account but IDK for sure

[ripe basin]

Alright, was trying to see if there's a better way than what I'm doing - Guess there isn't. lol

"Get some friends" 🤣

[worn wagon]

Okay i'm not much closer to figuring out this error, I'd really appreciate your guys' help

What I have been able to figure out is it only crashes when I have more than 1 game instance open

it provides me with this error Assertion failed: PIEInstanceID != INDEX_NONE [File:D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\LazyObjectPtr.cpp] [Line: 22]

For this code const FString URL = "/Game/Maps/MixtapeMansion?Listen"; GetWorld()->ServerTravel(URL);

So this assert triggers when the PIEInstanceID of the second client is not equal to 0, which it wouldn't be

So is it just not possible to test local networking in the editor? I can't imagine this is the case

Something is messing up somewhere, or this is a bug with the engine

Okay also running it standalone works fine, but both clients get connected, I'm guessing i'm misunderstanding something about how this all works xD

[worn wagon]

Got it working properly now but it still crashes on the client join if I run the instances in viewport instead of standalone

🤷

I FIGURED IT OUT FUCKERS

Okay so anyone having the same issue, go into advanced settings here

Then go down here and make sure "Run Under One Process" is OFF. It is enabled by default.

Idk why I couldn't find anything on this

[echo geode]

It's not a really a question, i just want to explain my thoughts about I just want to get the best idea for the make multiplayer implementation of that:, I have an range(oven) actor with the burner and the dial component. So i want to create a timer that when dial is changed and vfx effects to multicast(or onrep(repnotify)) on the time ends up, i'll call multicast function from the server to tell everyone that the time is up on the timer callback.

and while the burner heats, i'll imply the tick functions for heating on the actor's tick method(called on server) so it will evulate and call multicast RPC from the actor

[dark edge]

What do clients care about, in terms of the range's state?

float TimeRemaining and bElementIsOn?

or float TimeRemainging and float BurnerTemperature

[echo geode]

Clients should care about,
Burner's heat
Dial's degree value
Time that expire,
Overheating,
Burner's VFX

[dark edge]

Overheating and VFX can be derived from Heat right?

Heat drives Overheating which drives VFX

[echo geode]

Yes

Should I use rep notify ot multicast when the timer is ends up on the server?

[acoustic drum]

How can I get the network insights tab? I'm not really sure where I'm supposed to put the command -NetTrace=1 -tracehost=localhost -trace=net

[dark edge]

Either/Or, depends

[tacit bough]

hi,
probably simple to solve: I've got a basic HUD with the player's points. The points are part of each player's PlayerState, the variable is set to be replicated.

The HUD works fine on the server, but the not on the client.

The point it fails at is when I try to get the other player's playerstate via a function I've put into a general blueprint function library.

What's missing to make it work on the client side too?

[tacit bough]

kind of solved it. I don't know why yet but setting the own player controller reference on the OnConstruct event does not work reliably.

[fathom aspen]

OnConstruct isn't the place. It's called so early, and also it gets called multiple times. Use OnInitialized. Still you can't be 100% sure it's valid by that time, but it's most of the times, and you can always wait till it's valid

[fathom aspen]

Also this won't work for the simple reason that clients are not aware of other client PlayerControllers

PlayerController is only replicated to owning client

That's why you got PlayerStates. The container that has all PlayerStates is called PlayerArray(it's in GameState)

[tacit bough]

So meaning that this snippet would never work on clients although it is derived via the Game State?

Meaning, I should never try to get the player state via the controller or vice versa on any client, and instead should just get everything done with the player state directly.

[fathom aspen]

No matter what class is this. Yes this won't work client side

[fathom aspen]

You can always get the PC from PS or vice versa, but you can't get other player's PCs

[tacit bough]

wowie, that of course changes a lot of things, glad I got to know this early on in this project!

[fathom aspen]

Getting other people PlayerStates is valid though

All this honestly is written in here: #multiplayer message

[tacit bough]

I've read the bible at least 5x but I fail to reference it for specific things like these / forget the details while developing. Great link nonetheless though

my thinking was just wrong. I thought: hey, although I can't get the PCs directly, I can get them via their PSs right? nope of course not.

[fathom aspen]

Yeah I always keep it by my side when I'm not sure about things xD

[tacit bough]

the PCs don't just start existing on clients just because I attempt to get to them via the state

that's what I thought was happening lmao

[fathom aspen]

Oh I see where this comes from ^^

Yeah ofc not

[tacit bough]

yeye...

it's thoughts like these that the Bible doesn't touch on, it's the kind of wishful thinking you get into when nothing works for too long haha

[fathom aspen]

Yeah the bible is by no means a 100% complete source of info, as it would be 1000 pages in that case xD

But yeah it's good that this server exists and that people can ask

[tacit bough]

great, got it all working now :) fantastic

Only thing that's bothering me right now is that the update of the playerstate is pretty slow even on local machine testing, but that's a whole other story I guess...

alright, got that fixed in splitseconds just by changing the replication settings lol

[fathom aspen]

That's the easy fix yes. Their NetUpdateFrequency is potentially higher than other actors.

In cpp I would use an OnRep_PlayerState.

In BP I would delay until it's valid, or send a signal from the PlayerState class client-side on BeginPlay for example

[humble bane]

am having a strange issue where my animation replicates the first time but not the second time (client doesnt replicate)

animation replicates in other parts of my game every single time, so idk, strange, any help will be grateful

[humble bane]

I think I just found a work around, no worries

(for now )

[vague spruce]

what's the difference between #UE_BUILD_SERVER and #WITH_SERVER_CODE?

[glad escarp]

So, I have an actor that spawns several child actors at BeginPlay and passes a randomized string into each child. The first string is saved and used as a password to log into the parent terminal actor. I print the password so I can see it and display the passwords on the child actors. Problem is, the actual password isn't showing up on any of the children for some reason. Should I be spawning the actors via Server RPC to make sure they are the same for everyone? Does the string randomization have to happen on a server RPC? I'm just trying to figure out why the print string password works but it never shows up on the child actors like its supposed to.

[hollow eagle]

UE_BUILD_SERVER is only true when building a dedicated server. WITH_SERVER_CODE is true for any config that can act as a server - this includes pretty much all configs except Client.

[vague spruce]

good to know, ty

i need to send some custom options on connect to my server. do i just provide them like a query string?

            PC->ConsoleCommand("open 127.0.0.1");

[sonic dock]

Hello everyone, I am stuck in an issue where the client is able to connect to remote server hosted on windows server. But when I package for the linux build, the is not able to join. I ssh into the server instance and here are the logs.

The connection request is received by the server successfully but I am unable to join. It keeps sending RestartHandshakeRequest. Can anyone help with it?

[scarlet fjord]

Does anyone know if its possible to move AI pawns on clients? As in calling "AI Move To"

How can I achieve this?

[rocky kestrel]

Function in "player state"

in player controller when beginplay to set that id in player state

It works with dedicated server but when someone else joins game then it set first person id who joined to null

Goal is to have system that players know their unique "MyID = username+password" and server knows everybodys id

[rocky kestrel]

server log (I have replicated bp to print all players id from player states)

[fathom aspen]

Yes that's normal

You are using GetPlayerState(0)

[high ibex]

instead of index 0, try just getting player state and cast to your player state

[fathom aspen]

Which should be eradicated

[high ibex]

each player will have their controllers .. so rest of code should work fine

[fathom aspen]

You got a replicated PlayerState variable ready for use in PlayerController class. Learn to use it

Also if you are doing authority stuff in BeginPlay, do them after you do a SwitchHasAuthority and then you don't have to call a server RPC, just a normal event

[fathom aspen]

#multiplayer message

Read the compendium(in pinned messages) to know what GetPlayerXXX(0) returns when called from different configurations @rocky kestrel

[rocky kestrel]

Okay Thank you!

[fathom aspen]

With child actor do you mean child actor component?

If you want an actor to look the same it has to be either replicated and spawned on server or spawned locally and managed well

[glad escarp]

I'm just using Spawn Actor Of Class. I'm using a Server RPC to spawn the "child" actors. It seems to be spawning them correctly but they aren't showing up in the spawn locations they're supposed to be showing up in.

[fathom aspen]

I'm still not sure what chuld actors really mean? If ChildActorComponent then don't use them as they have so many gotchas and they are bad

[glad escarp]

Sorry. They are not strictly children

[fathom aspen]

You got a SpawnTransform when you spawn something, make sure it's what it's meant to be, i.e debug

[glad escarp]

They are just spawned by another actor. So they are independent actors.

[fathom aspen]

Ah ok, great then

[glad escarp]

ok. Yeah I've been trying to debug the actor spawn transform. I think it might have something to do with the way I'm randomly selecting a location. I'll work on it some more. Thanks

It's just confusing because the random spawn transform was working when I was just doing it all locally. It just started giving me problems when I started running it through a server RPC

[distant turret]

Hi, do you need a savegame blueprint if you are planning to use DynamoDB

[hasty blade]

[noob question] Why does the message only seem to reach the server?
If I put a breakpoint on BeginPlay, it stops on the server & on both clients.
If I put a breakpoint on the sending and receiving end of "Test Event" (image), it stops on both breakpoints on the server, but not on any of the clients on the receiving end.
What have I forgotten(/misunderstood)?

[twilit radish]

"Multicasts" as they are called only execute properly when on the server. If you want to send a message to everyone from a client you need to make a RPC from a client to the server, then the server can execute a multicast. Here's a nice show off when a RPC does what: https://docs.unrealengine.com/4.27/en-US/InteractiveExperiences/Networking/Actors/RPCs/

[hasty blade]

It IS sending from the server (as seen in the screenshot where it has stopped on the left breakpoint)...

[twilit radish]

Is your (I assume?) Actor relevant to all clients?

Also are you sure the actor already exists by that point on all clients when you're calling this?

[hasty blade]

The actor is placed in the map, and not created on the fly, and there is a 10 sec delay before triggering the event... so it should exist on all clients.
But since it doesn't work, I'm doing something wrong 😆
What do you mean by "relevant to all clients"?

[twilit radish]

Actors can be relevant or irrelevant based on certain conditions, such as distance or manually messing with things. If they are irrelevant to a certain client they normally don't exist for that client until the actor is relevant again.

[hasty blade]

Ok. Checking "Replicates" on the blueprint seems to make this message reach the clients. So does it have to be checked in order for events to replicate in actor's blueprint code?

[twilit radish]

If an actor is not marked as "replicated" or whatever blueprint exactly calls it again it's not networked. If you want something to have a network connection (or not) you need to toggle that yeah.

[hasty blade]

So it's the "Master switch". 😆
Ok. Then I have a chance to get somewhere with this.
Thanks a million! @twilit radish ❤️

[twilit radish]

Essentially a master switch yeah 🙂

Np! Good luck 😄

[dark edge]

Why is ID on playerstate then, just put it in the PlayerController if you want it to be private between server and owning client

but that's a wacky ass way to do IDs

[split siren]

Just a sanity check, I want to NetSerialize a boolean (and possibly couple more in the future). Is this the correct way to do it?

uint8 Flags = (bProxyIsJumpForceApplied << 0);    
Ar.SerializeBits(&Flags, 1);
bProxyIsJumpForceApplied = (Flags & (1 << 0)) ? 1 : 0;

[ebon cloud]

Hey guys! I'm running into an issue executing server event on a client.
as the listening server everything works just as intended:

but on the client

I have replication enabled on the actor as well

[blissful saffron]

server functions don't execute on the client..

[ebon cloud]

@blissful saffron is there a way I can get the client to turn on the lights for the other clients, or is this only possible with the listening server?

[blissful saffron]

Well, you'll need to have your light actor replicate its on/off status to the clients

[dawn ledge]

the client should send to the server, then the server should send out to all clients

[ebon cloud]

how would I go about doing that?

[blissful saffron]

So you could either have a replicated prop that tells whether the light is on or off (the way I'd probably handle it) or you could send a netmulticast rpc from the server once it receives the update

so if your actor replicates, that doesn't mean that every property on the actor is replicated

so maybe set an 'on' variable on your light that is replicated

then when the clients send the server function to turn it on, it sets that variable and that'll replicate back to clients

[dark edge]

Do this

Boolean bIsOn(replicated, repnotify)

Client
Input -> Run on server event

Server
Run on Server Event -> Set bIsOn

Everywhere
OnRep_bIsOn -> update stuff (light output, etc, play sound, etc)

[blissful saffron]

^^

[dark edge]

https://docs.unrealengine.com/4.27/en-US/Resources/ContentExamples/Networking/1_4/
Learn it, love it

[ebon cloud]

thank you guys for the responses but again sorry for being dumb

[blissful saffron]

Sorry, I can't really see that. What's the issue?

[dark edge]

Repnotify my dude

[dark edge]

That function

that's where you do light stuff

Inside that function, get LightOn, and select or branch on it

Since it's an overlap and you can do it all with no client input, do this

Server:
Overlap -> HasAuthority? -> Event if you want -> Set w/ notify LightOn

Everyone:
Onrep -> do light stuff by branching or selecting using LightOn

Done.

no RPC events

It's that simple

[ebon cloud]

@dark edge

set rep is set to true

but still no lights on client

[dark edge]

In your Onrep, that's where you actually modify the lights

That's the end of the chain

This will be like a 3 parter, sec

Make sure the actor is replicated. The light component doesn't have to be.

[ebon cloud]

@dark edge so if I put has authority only the listening server can turn on all the lights

and they replicate down

but if the client touches the button

it doesnt do anything

[dark edge]

The overlap will happen on both machines

just the one on the client does nothing

This is all triggered by an overlap correct?

[ebon cloud]

yeah its an overlap

[dark edge]

K it should happen on server too

[ebon cloud]

@dark edge what was the point of has authority in the beginning?

if the client interacts with it wouldnt nothing happen?

[dark edge]

Without the HasAuthority it might change the light clientside. Repnotify in BP is really just a hack for OnChanged.

It's good practice to gate it

[coral wing]

GetWorld() doesn't work in multiplayer?

[dark edge]

It should

[ebon cloud]

@dark edge still nothing on clients :( listening server works fine and all the clients see the lights turn on, but if I'm playing as the client and hit 3 only the clients lights turn on :(

[dark edge]

You changed your triggering approach

To make it go off of client input you'll need to
Hit 3 -> Run on Server Event
Run On Server Event -> Carry on as normal

Before you were using an overlap, which would happen on the server.
Hitting 3 doesn't happen on the server, so you need to RPC that like how I just diagrammed.

[ebon cloud]

@dark edge interesting so it actually works now

if I call it from 3

but not when I hit the overlap

[vagrant grail]

Simple question : Is this code Secured ? Like I'm having a debate with someone and I keep saying that he shouldn't add inputs to server events as those events are RPC so client can call it and send his own arguments through that so it creates a security issue but he keeps telling me that as long as he doesn't call that RPC from the client it's all good and he's doing that to pass arguments between 2 events on the server. So my question is 1 - Is it secured ? 2 - Can a client call that event (so is it an RPC) through a cheat even if in his blueprint there's no node calling the server from the client ? 🤔

Please ping me if any answer 🙂

[ebon cloud]

@dark edge it works now, I just casted to the character and called an even from there

thank you so much

[twin juniper]

Hi, dumb question but imagine i pass a Struct in an Server RPC (so from client to server), this struct contains a pointer to an replicated AActor, does the server receive the struct with the AActor client instance or it converts it to the server instance as if i would have passed an AActor* in the rpc instead of the struct

[dark edge]

Does the overlap happen on server?

Have you checked that yet?

[dark edge]

That can be cheated, I can just call Attack whenever I wanted.

Or rather SRV Attack, I can call that whenever

Even when dead

Because you only do your Not Is Dead check on client

[vagrant grail]

So do we agree when we create a server Events it's an RPC ? And we should never put inputs going from client to server ?

[blissful saffron]

Yes, they're RPCs

[graceful flame]

Do Server_Attack > Is Not Dead? > continue ....

[ebon cloud]

how would I be able to check for that?

[blissful saffron]

You can put inputs in them

[graceful flame]

and on client side as you have it

[blissful saffron]

You need to validate actions the server takes that are initiated by the client