multiplayer

[dark edge]

Sure, it's fairly trivial.

I would start with just trusting the shooting client, and then once it works, add some verification if you want

You aren't going to get roll back and all that but you could do something really simple like this?

[ivory bear]

Thanks...I will see what I can rig up. Spent time on my asset integration and first person view, only replicated stuff is movement, aim offset, shooting and weapon pickup. I would think that item pickups and inventory could still be server authoritative, and do movement, shooting and aim offset client auth...

And tough trying to convince the wife to let me spend $350 on a plugin (GMC). LOL

[dark edge]

I mean it all depends. You aren't even going to do a correct sprint without C++ unless you want to do some very cheatable stuff

[dark parcel]

I think watching youtube multiplayer tutorials that does it with pure bp is already a mistake imo

just look at the number of "sprint in multiplayer tutorial" out there

literar copy paste of same trash code that doesn't actually work

like it looked fine bcuz they didn't emulate lag and doing it in editor with 0 ms

the moment latency is introduced, it's unplayable

[dark edge]

By the way, the cheatable sprint I'm talking about is basically client side authoritative Sprint. Just clamp the input size when you're not sprinting, and allow it to go to size 1 when you are.

[ivory bear]

I hear ya, but all I have. Free time is a premium, and it is spent in UE. 😉
As mentioned on another thread, I have 12 or so game ideas I want to do over the next umpteen years, 2 are FPS's and dummy me started my trek with one of the FPS's LOL
I have multiplayer exp on a number of projects, just not in UE or C++

[ivory bear]

So clamp it so they can't cheat or that is how they are cheating?

[dark edge]

They can cheat by just not clamping it.

Basically, you are trusting the client to not send a full-sized movement input to the character movement component when they are not sprinting.

But it will work perfectly, you're basically emulating an analog stick only being pushed halfway when walking, and being pushed the entire way when sprinting

[ivory bear]

Someone directed me to this: https://www.udemy.com/course/ue5-multiplayer-fps/
I dont see anything in the curriclum about lag compensation though...

[brazen anvil]

If you want a good FPS multiplayer tutorial you should use Stephen Ulibarri's course. He uses C++ (because you should) and he adds server rewind, client prediction, lag compensation, and a bunch of stuff.

He has a 10hr section on lag compensation.

[dry pebble]

+1 on stephen's multiplayer shooter course. Anyone wanting to learn networking with ue should take that

[ivory bear]

ahh, so this one?
https://www.udemy.com/course/unreal-engine-5-cpp-multiplayer-shooter/

[brazen anvil]

Yes

This course will beat any YT tutorial x100

[ivory bear]

I guess it will be trivial to make it first person as it appears to be third person?

[brazen anvil]

yeah that wont be a issue.

yt video for that

[ivory bear]

As it is on sale for $17 bucks (82% off) I may move on to one of my games that can be multiplay in blueprints (social hangout type stuff/not fast paced) and take that course. Kill 2 birds with one stone, make my game and finally, after coding since 1982, learn C++.

[brazen anvil]

Yeah that would be a good plan.

[faint cloud]

I've never profiled before do I use the console?

[dark parcel]

That course go through network clock, lag compensation, rewinding, client prediction, etc

[dark edge]

Start with the stat commands and then record some gameplay and look at it with the profiler

https://docs.unrealengine.com/4.26/en-US/TestingAndOptimization/PerformanceAndProfiling/StatCommands/

[brazen anvil]

Also you can easily get access to alot of Udemy courses if you have a library that has access to Gale

[mint stream]

// Camera pitch replication
  UFUNCTION(Server, Reliable, BlueprintCallable)
  void ServerCameraPitch(double Pitch);

  UFUNCTION(NetMulticast, Unreliable, BlueprintCallable)
  void NetMulticastCameraPitch(double Pitch);

And then in the main

void Look(const FInputActionValue& Value) {
    // input is a Vector2D
    FVector2D LookAxisVector = Value.Get<FVector2D>();

    if (Controller != nullptr) {
        // add yaw and pitch input to controller
        AddControllerYawInput(LookAxisVector.X);
        AddControllerPitchInput(LookAxisVector.Y);
    FRotator Rotation = FirstPersonCameraComponent->GetComponentRotation();
    ServerCameraPitch(Rotation.Pitch);
    }
}

void ServerCameraPitch_Implementation(double Pitch) {
  NetMulticastCameraPitch(Pitch);
}


void NetMulticastCameraPitch_Implementation(double Pitch) {
  FRotator Rotation = FirstPersonCameraComponent->GetComponentRotation();
  FRotator NewRotation;
  NewRotation.Roll = Rotation.Roll;
  NewRotation.Pitch = Pitch;
  NewRotation.Yaw = Rotation.Yaw;
  FHitResult CameraHitResult;
  FirstPersonCameraComponent->K2_SetWorldRotation(NewRotation, false, CameraHitResult, false);
}

I am currently doing this to replicate camera pitch. But I noticed that the client's camera jitters when looking up/down. Any idea on how to fix that?

[shadow hatch]

when playing either coop or dedicated in pie my character rotates slowly on server and remote clients, i didnt have this issue before. what could it be caused by? i can move perfectly fine and the character rotates how it should on the local player. idk if this makes sense

oh found the culprit, not sure why i set it to 0.66 at some point...

[dark edge]

The pitch component of ControlRotation should already be replicated

Get base aim rotation or something like that

[mint stream]

Are you saying I don't need to do all this extra stuff?

[dark edge]

I'm not sure if the entirety of control rotation is implicitly replicated, but the pitch is for sure.

[mint stream]

Ahhh Gotcha. I just swapped it and it's working A LOT better. No jitter whatsoever!

void NetMulticastCameraPitch_Implementation(double Pitch) {
  FRotator Rotation = GetBaseAimRotation();

Call:

FRotator Rotation = GetBaseAimRotation();
    ServerCameraPitch(Rotation.Pitch);

[dark edge]

Why do you need a multicast for this?

What exactly are you trying to do?

[mint stream]

Maybe I have a misunderstanding of Multicast or am just using it wrong. I am testing out creation of a multiplayer FPS. So I thought that I want to show the pitch to both server and client. Are you saying I should just run on server instead?

[dark edge]

Everyone already has the pitch, automagically

Just use get base aim rotation whenever you want the pitch

[mint stream]

Sorry, I am a noob, are you saying to do this then? AddControllerPitchInput(Rotation.Pitch);

[dark edge]

Adding controller input should be done on owning client only

That modifies the ControlRotation, which implicitly drives the stuff that GetBadrAimRotstion uses

[mint stream]

Sorry, I am confused. Where would I use the GetBaseAimRotation()'s result?

[dark edge]

Wherever you wanted to. Whenever you want to know the pitch

[mint stream]

Right, and currently I only want to know the pitch for the FirstPersonCameraComponent to visually show to the other clients and server that it's pitching. I tried to set it directly, but it didn't seem to replicate (probably doing something wrong)

[muted pewter]

I have just packaged a dedicated server but whenever i try to run it it throws a notification:

PS: I havent cooked assets for server yet
Image

[latent heart]

In shipping?

[muted pewter]

just compiled the server.target.cs file and started the .exe file upon which its giving this error

[latent heart]

Using which configuration?

[muted pewter]

Development Server

[latent heart]

Not shipping then.

Have you tried deleting your binaries and intermediate folders and recompiling?

It might just be a fubar build.

[muted pewter]

Also i have just recently converted project from binary engine to source

[latent heart]

Honestly I'm not sure if that error is created by UE or by windows because the exe is broken.

[muted pewter]

so maybe thats causing isssue

[latent heart]

That shouldn't be too much of a problem.

Just delete binaries/intermediate and build again.

[muted pewter]

alright

[frank hearth]

Just bought 👀 eager to dive right in! It's one helluva long course, so I guess I will skim and adapt the course learnings to my current project

[frank hearth]

Wow this course is great. Exactly what I wanted

I guess the moral of the story is to ask the community for learning advice before embarking on studying a topic 😄

[muted pewter]

Update: You have to cook assets fro server before running it. Fixed the issue.

[thin stratus]

Please just do one thing: Use more than one resource. The tutorial might be great, but it might also do a lot of stuff "wrong".
It's best to learn from multiple places and then deciding which way of implementing something feels the best (or even discussing it here).

[brazen anvil]

Could I just add the stance into the FSavedMove?

[thin stratus]

That is one of many things you would need to do

At least if you want corrections to properly replay the moves between the correction and the current predicted move :P

Unless the "stance" can be deduced by already known things

[brazen anvil]

No it wouldnt be able to. So it would def need to be in a FSavedMove so that it knows that if it is crouched, which stance.

[thin stratus]

I'm not entirely sure about your specifications for that feature, so hard to point you anywhere.
We do have a github repo pinned on this channel that shows some examples on how to extend the CMC

The general idea is to send any data the server needs via the ServerMove.
Inputs can be send via the InputFlags or whatever thye were called (check the mentioned repo).
More info would need you to implement a custom ClientDataContainer or whatever they are called (has a freaking long name).

Anything that has to be known to replay a move that can't be deduced from other information has to be placed into a savedMove

And that saved move has to implement a bunch of functions to ensure that the new property is also handled correctly

Such as does it allow combining a move

And then you might also need to handle the correction itself. Similar to ClientDataContainer there is one for ServerData when a correction is send.

[brazen anvil]

FCharacterNetworkMoveDataContainer?

[thin stratus]

Optionally needed of course, depends on the feature

There are two, I don't have the engine open and I won't open that today anymore, it's 10 PM :P
That could be the right one yeah

And with all of that you'd then need to utilize the existing functions of the CMC to use those new properties and code your feature

Which highly depends on what that feature is

If it's similar to Jumping or Crouching then you can check how they use the Input Flags to start ands top crouching

And what they save in the SavedMove etc.

[brazen anvil]

Yeah I have looked at PredictedMovement and I have also been using Delgoodies version as well.

I guess the only thing the server needs to know is if it is crouched, and then what stance it is at. And then the player can change the stance while still crouched. So I would just need to keep that stance updated. I also thought about using it as indicating whether or not you are crouched. If it is 0 then that means not crouched. Then 1-5 would be the stances.

So if I went with that, I only need to use a single byte.

[thin stratus]

What are you trying to do anyway

What is "Stance" here?

[brazen anvil]

different crouch levels/stance

[thin stratus]

How are they controlled?

[brazen anvil]

mouse scroll

[thin stratus]

So first scroll is level 1, down to level 5?

[brazen anvil]

yeah

[thin stratus]

And scrolling up goes the opposite direction?

[brazen anvil]

Yes

+1 or -1

[thin stratus]

Does the play have to actively crouch or is that triggering the crouch?

[brazen anvil]

that triggers it. So basically if you are holding the crouch button and let go, you will crouch to the lowest by default. If you hold crouch and scroll you can go up or down depending where you are at in the crouch.

[thin stratus]

If I don't hold crouch and scroll?

[brazen anvil]

so if I held crouch and scrolled down I would go through the different crouch levels

nothing happens then

[thin stratus]

Okay

Does the Level need to be saved between 2 crouches?

E.g. if I crouch and go to the mid level and uncrouch

would i still be at the mid level next time I crouch

Or does it reset

[brazen anvil]

It would be nice if it did that.

[thin stratus]

So saving?

[brazen anvil]

yes

[thin stratus]

Yeah then you'd need to:

• Send the Input for + and - to the Server via the available InputFlags that are still free
• There should be a function that handles the Crouch Input and Crouches/Uncrouches based on that. I would try to place the logic to check for the + and - key input there and simply check if we are crouching or not.
• Based on that you can set a CrouchLevel int then
• You can also set a Replicated Crouch Level on the Character (CMC is not replicated by default and I would keep it that way) with an OnRep to drive animations and capsulse size for SimClients if needed
• Save the CrouchLevel in the SavedMove, implement the required functions with that in mind
• Send it from Server to Client on corrections to ensure any form of Correction tells the Client the correct CrouchLevel
• You might need to override the function that replays the moves (ClientHandleCorrections or something like that) and save the current CrouchLevel before replaying
• Not 100% sure though. Epic does that with some stuff because the SavedMoves literally change variables on the CMC and if that last change it replays is different from what is currently going on (like a key being pressed) then the client would suddenly not do what they think they do (if that makes any sense)

[frank hearth]

Wow, it's Cedric himself! I was studying your guide in tandem with the Unreal docs, but I feel like I need a supplement like the Udemy course to show me the networking edge cases / failure scenarios.

The advice of learning from multiple places is excellent, I will keep that in mind

[thin stratus]

isn't that more #cpp ?

[eternal canyon]

oops

i thought i was in cpp mb lol

[brazen anvil]

By input flags are you talking about the compressed flags?

Those are used like a bool

[thin stratus]

They are a bit mask

0101 0101

Think it's a uin8 iirc

[brazen anvil]

yeah

4 are used by the engine

so you get 4

[thin stratus]

Yeah if you need more than 4 new ones then you would need to use that container I talked about and add a similar setup

Most people are fine with 4 though

[eternal canyon]

i made a tutorial on making more

[brazen anvil]

Yeah I think I can start working on something now though with a plan. thank you for the help

[eternal canyon]

and just sending custom data in general

https://www.youtube.com/watch?v=ZrPr20s4rvY&

[brazen anvil]

I have that open in another tab lol

[eternal canyon]

lmao

[brazen anvil]

i downloaded the the smooth network plugin and then came back to it a couple days later. I was looking in it and I was so confused. then I went back to the github and seen it was a plugin for blueprints.

[thin stratus]

Yeah that's great. It would be good if this stuff would be part of the CMC Git Repo

[eternal canyon]

https://github.com/Reddy-dev/SMN2/tree/master(deprecated)

[thin stratus]

If you ever find time to PR an example, that would probably be great

[eternal canyon]

if u look at the old master branch

theres a more easy to read example for sending custom data

[thin stratus]

#multiplayer message

It's this one

[eternal canyon]

tho note dont take that directly since its client auth, since its input data

[thin stratus]

The 4 examples are sadly very similar to each other

And are missing that custom data stuff

I think they have the ResponseData

But not the MoveData

[brazen anvil]

In his example he actually has a bug due to a timer.

I think it was the prone timer.

[latent basin]

I want to have a timer that shows how much time has been elapsed, its for a multiplayer game and it should be the same for all clients. Where would the correct palce be to handle calculating time elapsed, the game mode, game state?

[thin stratus]

https://vorixo.github.io/devtricks/non-destructive-synced-net-clock/

This basically, but it is C++

Like so many things in Multiplayer

You can try to mimic that in BPs fwiw

[latent basin]

Hmm is there any wya to do it in bp, its just a simple timer nothing to complex

[eternal canyon]

also depends on how exact it needs to be

[latent basin]

Okay ill have a look

[thin stratus]

It's sadly not that simple

Cause everyone can have a different ping

[latent basin]

Damn that makes sense

[thin stratus]

The naive version would be

• ReplicatedVariable in GameState
• Set it to, I think, GetServerWorldTimeSeconds() only on the Server on Tick

But this does not account for the Ping to each user where it might take 100ms for one and 50ms for another

You can also try Epic's function with just using GetServerWorldTimeSeconds() directly (function on the GameState)

But it's not very nicely synced

Unless that changed recently

[latent basin]

Thanks alot for your help you went above and beyond for me i appreciate that

Im going to try run tests then with the link you gave me vs the bp server world time sec function

Thanks

[thin stratus]

Ah yeah, there is a timer

I usually use a Timestamp

And then use the ClientTimestamp to calculate it

@grand kestrel Maybe worth improving the Prone code to not use a Timer

[brazen anvil]

He knows. its logged as a issue on his github

[thin stratus]

Ah

[brazen anvil]

https://github.com/Vaei/PredictedMovementExample/issues

[thin stratus]

Yeah okay, can't hurt to annoy him

[brazen anvil]

lol

oh now hes typing

[grand kestrel]

Yeah 😄 I have other priorities atm
Feel free to PR if you'd like, otherwise I'll get to it eventually

[thin stratus]

What, other priorities than giving your life for the UE community?

sigh

[grand kestrel]

That's a good point, I was going to make a game, but that's not important 🤣

[thin stratus]

I can't say I have the time either. I'm only really answering between doing other stuff

[grand kestrel]

Is there an engine example somewhere I can copy/paste

[thin stratus]

Don't think so. I can try to find something I did

[grand kestrel]

If I don't do it now it might get put off for quite a while lol

[thin stratus]

I have a cooldown example

Might not be 100% complete though

[grand kestrel]

I'll have a look, if it looks like it'll start taking time I'll do it later 😄

[thin stratus]

Ja it's quite old actually. You'd save the a float timestamp in the CMC and SavedMove.
And then use it like this:

bool UVRTCharacterMovementComponent::CanStartBoost() const
{
    if (!IsValid(VRTCharacterOwner))
    {
        return false;
    }
    
    if (!VRTCharacterOwner->CanStartBoost())
    {
        return false;
    }

    const bool bEnoughBoostPower = BoostFuel >= MinBoostFuelToBoost;
    const bool bIsFalling = MovementMode == MOVE_Falling;
    const bool bOnCooldown = GetRemainingBoostCooldown() > 0.f; ////////// <<<<<<<<<<<<<<<<<<<<<<<<<<<<
    const bool bHasFuelTanks = VRTCharacterOwner->GetCurrentFuelTanks() > 0;

    return bEnoughBoostPower && bIsFalling && !bOnCooldown && bHasFuelTanks;
}

float UVRTCharacterMovementComponent::GetRemainingBoostCooldown() const
{
    const float CurrentTimestamp = GetTimestamp();
    const float RemainingCooldown = BoostCooldown - (CurrentTimestamp - BoostCooldownTimestamp); /////// <<<<<<<<<<<<< BoostCooldownTimestamp
    return FMath::Clamp(RemainingCooldown, 0.f, BoostCooldown);
}

void UVRTCharacterMovementComponent::SetBoostOnCooldown(bool bNewValue)
{
    if (bNewValue)
    {
        bBoostOnCooldown = true;
        BoostCooldownTimestamp = GetTimestamp();
    }
    else
    {
        bBoostOnCooldown = false;
    }
}

float UVRTCharacterMovementComponent::GetTimestamp() const
{
    if( CharacterOwner->GetLocalRole() == ROLE_Authority )
    {
        if( CharacterOwner->IsLocallyControlled() )
        {
            // Server for owned Character
            return GetWorld()->GetTimeSeconds();
        }
        else
        {
            // Server for remote Character
            const FNetworkPredictionData_Server_Character* ServerData = GetPredictionData_Server_Character();
            return ServerData->CurrentClientTimeStamp;
        }
    }
    else
    {
        // Client for owned Character
        const FNetworkPredictionData_Client_Character* ClientData = GetPredictionData_Client_Character();
        return ClientData->CurrentTimeStamp;
    }
}```

void UVRTCharacterMovementComponent::PerformMovement(float DeltaTime)
{
    Super::PerformMovement(DeltaTime);

  // [..]

    if (bBoostOnCooldown && GetRemainingBoostCooldown() <= 0.f)
    {
        SetBoostOnCooldown(false);

        if (VRTCharacterOwner->GetCurrentFuelTanks() > 0)
        {
            ResetBoostFuel();
        }
    }
}

That's only a part of it

But should bring over the general idea of a timestamp vs a timer

[grand kestrel]

Yeah that's pretty clear, I'll work on it in a moment

[thin stratus]

bBoostOnCooldown was needed iirc, but maybe that can be removed if there is a smart idea. Without that the remaining BoostCooldown would be far below 0 and still trigger the code in the PerformMovement

That boolean also needed to be in the SavedMove

The rest is a lot of boilerplate shit for the SavedMoves and corrections

I also can't say if that is the best way of placing all those events. But it worked damn well for VRTribes

[grand kestrel]

I'll probably do it that way ; I might experiment more if I had an active project that needed prone 😦 Better than missing edge cases

[thin stratus]

Yeah it's not easy to figure this out without testing a lot. There is a lot that might just go unnoticed

Like the need to set stuff when combining saved moves etc

[grand kestrel]

That's a good point
I'm going to do it later then 🤣
My upcoming game will have some prone, probably, so I'll do it then and I can test

[thin stratus]

No stress. I didn't even know about this until now.

(the bug on the repo)

[grand kestrel]

Yeah, it's not a major issue that people can't work around

No point doing it wrong a second time by rushing it

[muted pewter]

upon connecting my game from editor to dedicated server running on my machine game establishes a connection with server and loads the map but merely for 2 seconds and then editor crashes with this error:

any idea ?

[woven bramble]

Guys, I want to set the locations of all players to one location. Character_BP (RunOnServer) -> GameState (RunOnServer) -> Then using For Each Loop (get all player controllers), I cast PlayerController -> Set Player Locations (RunOwningClient) iin playercontroller.

But it's just work for Server, not working for Client. Does anyone know?

[unkempt tiger]

Anything I can call on my actor so that it replicates as soon as possible instead of waiting for the next replication cycle (which can be a way if NetUpdateFrequency is low)?

[fossil spoke]

ForceNetUpdate() is the best you have

[unkempt tiger]

Awesome to know, it kind of failed me before sending that message, but now that I've recompiled it seems to be working 💪 thank you!

[dark edge]

Why not just
On Server:
Get players array -> for each -> get their pawn -> set their location

[woven bramble]

thx it worked

[woven bramble]

Does anyone knows why set actor rotation doesn't work? (or set actor transform not working for just rotation)

[woven bramble]

for this system "Get players array -> for each -> get their pawn -> set their transform"

[dark edge]

It does work, it's just it's instantly being changed because you are using control rotation to drive the rotation of the character.

[woven bramble]

That's right, after I add ControlRotation it worked, but only for Server.
On Client side only Location works properly, control rotation does not work.

I think this is because ControlRotation is not suitable to be replicated and I am starting the process by doing RunOnServer.

But I don't know the solution (if my inference is correct .d)

[dark edge]

Just set control rotation for the player too if that's a thing

[brazen anvil]

Ok I am confused. When extending FSavedMove_Character do I need to do anything special to add custom state data?

[dark parcel]

https://www.youtube.com/watch?v=urkLwpnAjO0&list=PLXJlkahwiwPmeABEhjwIALvxRSZkzoQpk&ab_channel=delgoodie

[brazen anvil]

yeah thats what I am looking at

but it doesn't make sense

[pallid rampart]

hey guys, any tips for predicting slide movement? Once I add in some emulation it gets really laggy, if anyone has done this type of thing before i'd love any info 🙂 thanks

[fossil spoke]

Slide is just an axis limited crouch with a different animation and movement speed.

It shouldnt be difficult to implement when thought of in that way.

[dark parcel]

look at the tutorial from delgoodie, he does sliding, wall climbing, dash, etc

[unborn nimbus]

During replication, how does a client know which actor the replicated data belongs to?

[dark edge]

Replication happens within the context of actors. It can't not know

That's like asking how I know which email address sent me a message. It's implicit.

If you're asking about the specifics of how some ID gets resolved to an actor, that's probably going down the stable naming rabbit hole.

[fading smelt]

Hi all! Can someone suggest good course about creating and working with multiplayer in UE5, please?

[dark edge]

Are you already comfortable in Unreal?

[fading smelt]

I have 2 years of commercial experience as Gameplay programmer. My problem is al my previous projects/prototypes was pure single player + we use GAS a for bit, but mostly for creating GE and some Temp Buffs. So i have 0 experience in multiplayer and because of that i lost most of my job opportunities

[fading smelt]

So, yes, I'm comfortable with UE, but I'm lacking multiplayer experience and I want to fix that by taking a few courses.

[woven basin]

I can highly highly highly recommend Stephen's c++ multiplayer course: https://www.udemy.com/course/unreal-engine-5-cpp-multiplayer-shooter

If you jump on his discord - he gives out coupons almost weekly that makes the course cheap. It uses best practices that many people in here talk about, and it talks about server side predicition etc that most others dont.

He's also in the final stages of a deep (400 video+) course on GAS that is extremely amazing.

By far one of the best paid resources - and its crazy cheap for the value it gives.

The GAS course is just next level though - its amazing...

[fading smelt]

ok thx

[hazy silo]

hey there, what is the best way of replicating a pawn's/character's rotation?
I can't imagine creating my own rep notify variable and updating it on tick is the way to go 😅

(assuming I don't want to use the player controller's control rotation)

[vapid mortar]

hi. does anyone know how to replicate 3d widget? My situation right now is when new player just joined the room while the current players in the room turned on the 3d widget(mic on), the new player cannot see the 3d widget which actually was turned on. How to solve this?
My setup right now : widget bp cast to character bp which have custom event run on server then pass to custom event run on multicast and set flip flop to set hidden the 3d widget to true or false

[latent heart]

It's already a candidate for replication. There might be a flag you have to turn on, I forget.

[dark edge]

Don't try to replicate the widget itself, replicate the state that drives it

Mic on should probably be a bool on PlayerState

[queen escarp]

https://gyazo.com/2a6f7aed7ea49f2db7c5f827910b8244

tips ?

[dark edge]

Show your component tree and how you actually open the door

[cosmic yoke]

hello will PlayerController->GetNetOwningPlayer()->GetUniqueID(); will contain the same unique id from the player state, which uniquely identifies that player if you are using EOS or steam?

because the playerstate uniqueid is a FUniqueNetIdRepl

so i'm assuming it's not the same

[solar stirrup]

Repl is just a wrapper

Same underlying value afaik

[cosmic yoke]

so how do i get the actual int32 that PlayerController->GetNetOwningPlayer()->GetUniqueID(); gives to confirm?

[solar stirrup]

it's not an int32

Depends on the platform and implementation

You can use ToString() on it afaik

[dire dragon]

do i need to do 3 custom events for (for example) use? (run on server, run on client and multicast)

[latent heart]

Depends on your use case.

Unless you explain more then the answer is shrug

[fervent leaf]

Hi, I have a component that has a Uboxcomponent. I try to setup attachment to the owner of the component, so the boxcomponent stays on the mesh of the owner. I dont understand why this wouldnt work

[latent heart]

You shouldn't use a multicast there.

Anyone who joins after the multicast won't know about the grab.

Use a replicated variable.

[dire dragon]

but if i don't use the multicast then if the client grab's, the server and client see's it but when the server grabs then the client see's it but server doesn't (the set transform)

[latent heart]

Add a variable to your player, "grabbed object", with an onrep. When that onrep fires, attach the object to the player. Or whatever you do.

Instead of attaching where you are, simply set that variable instead.

And wait for the onrep to do the attachment.

[dire dragon]

what if i don't want player's to join after the grab?

[latent heart]

It's still a better system.

[dire dragon]

oh wait.. my client has authority too

so i need only multicast?

[latent heart]

No. No multicast at all.

Or the client rpc.

Just the server rpc and the onrep.

[dire dragon]

i really don't know what u talking about, i only watched like 2 tutorials about multiplayer

[latent heart]

Then watch more.

[dire dragon]

so i removed the multicast and authority switch and now if the client grab's then the client aswell as the server see's the hand change transform but when server grab's then the server see's the hand change transform but the client doesn't

it look's like this

[latent heart]

That's why you need the replicated variable.

[dire dragon]

i don't know what that is....

[latent heart]

It's a extremely core part of multiplayer. You should learn!

[dire dragon]

okay i learned what replicated variable is and what rep notify is but i still don't know how to do that

[muted pewter]

I have just packaged a dedicated server on my local machine and now i want to create a session on this server upon request from a game instance running on android device. How can i configure Server for this?

Android Device is able to connect with the server

[queen escarp]

@dark edge

[dire dragon]

okay i did the grab but what about drop? do i use the same variable?

the grab one works but the drop one doesn't

[cosmic yoke]

what is the best way to prevent the destruction of the player state if a client disconnects and reassign it when it reconnects? In theory overriding CleanupPlayerState would prevent the destruction of the player state when the player controller is destroyed, and overriding InitPlayerstate would allow me to assign the existing instance, instead of creating a new one, but to get the right player state i need to use the unique id, which means i need to have to way to get the unique id on the player controller before creating the player state. Is there a way to do that?

[latent heart]

Yes. When you drop it, just set the vars to none.

[dire dragon]

okay i did but now this happens

[queen escarp]

@dark edge ideas :/ ?

[dark edge]

Show collision for frame only

[queen escarp]

collision for frame :/ ?

[dark edge]

Drag the frame mesh, and each of the door meshes into the world and show the collision view of them

[queen escarp]

yeah nothing wrong with them tbh

but its only showing on 1 clent its not rpcing on the others when its opening

id say thats the first issue

the gate is a npc actor wich is always the server so idnno why its not rpcing ?

[sinful tree]

Is your "Event Use" event being called on the server?

[dire dragon]

bump

[queen escarp]

@sinful tree

is being called from a player character bp then to a parent class interact_BP then to the door object

do i need to call it from the player character via server ?

[sinful tree]

Multicasts can only be executed by the server to be seen by everyone else.

[queen escarp]

yeab but since im only calling a function on a npc unit on the server shouldent it be enough with just that npc from the server calling the rpcing :/

[sinful tree]

What I'm getting at, is that whatever your execution flow is, it must be running on the server for the multicast to work.

[queen escarp]

yeah but anything the "Door" dose since it only exsist on the server is always run on the server since its replicated

but im guessing i got that wrong :/

cuz i called it via server and now it rpcs as it should from the player

[sinful tree]

Example:
If you have a client pressing an input and then that eventually ends up calling "Event Use" without the server knowing about the input from the player, then it's only running on the client, so the multicast won't fire.

The correct way would be:
Client presses button > Run On Server event > Server calls "Event Use", then multicast fires correctly.

[queen escarp]

yeah exxactly

but i though when i call a function on a npc actor thats alwys only on server side

and from the npc it calls the rpc then it should work in the same way

not that i would have to call it from the players server side to make it rpc

but yeah i understand what you mean

its just i got it on the other foot basicly

but nice that works

https://gyazo.com/f8fd841a21f214995621806292e72c6a

however ?

ideas ?

[sinful tree]

The way to look at it, is that each instance of the game is its own separate thing. When you call a function when you've triggered an input on the client, it's running on the client. If something triggers on the server such as say an overlap being detected, then the server would be executing it as it knew about it. No instance knows what the other is doing unless you communicate to the other instance. There are effectively two ways of communicating between those instances:

1. Replicated Variables
2. RPCs

Replicated variables will only replicate if they are set on the server. Setting a replicated variable on a client only changes the value on that client. When running on the client you can change replicated variables on other actors that the client doesn't own, but it's only changing on that client's instance of the game.

RPCs are a means of sending an instruction and some data between the instances. Multicasts attempt to send the instruction to anyone who has the actor relevant, basically like an "Everyone hear this!" message, but these can only be sent by the server. "Run On Server" and "Run On Client" are very specifically tied to the "Owning" client, meaning that in order to send the instruction from the client to the server (Run On Server) the client must own that actor. Similarly if you want the server to send information to the Owning Client of the actor, then you'd use a Run On Client RPC, but again, it'll only work if there is a client that owns the actor you're attempting to call it on. No owning client, no message sent.

[buoyant wedge]

hello
any one have a GIF that explain CLIENT PREDICTION vs NO CLIENT PREDICTION?
I need it to put in a personal documentation

[dire dragon]

bump

[queen escarp]

yeah datura thanks for info i kinda semi" knows all that" im still learning obviously but this is just a weird thing i encountered but this cleared it for me

however the collision this i dont get ./

[dark edge]

Can you confirm that the frame does NOT have collision in the area where the doors will be?

[dark edge]

Pathfinding

show navmesh

[queen escarp]

i mean if im looking at it with "playercollison view mode / vision collision" etc then i cant se any collisio

[dark edge]

Yeah your 2nd video looks fine, now the problem looks like pathfinding

I bet your navmesh isn't updating

so pathfinding doesn't know it can walk through the door now

[queen escarp]

yeah that makes sense since i can test from otherside and walk

so how would i update that ?

[dark edge]

navmeshvolume has option to auto update or something like that

[queen escarp]

hmm

cant find any options like that :/

ill google

yeah so its the navmesh thats the prob atleast

[sinful tree]

No Prediction:

Client Prediction

[buoyant wedge]

@sinful tree thx you.but I meant a GIF of an example in a game

[dire dragon]

why is that happening

[dire dragon]

the grab one works

[dark parcel]

No navlink proxy?

[queen escarp]

@dark parcel wassthat

[dark parcel]

look it up, maybe that's what you need

[pseudo merlin]

hi, this is kind of a multiplayer question kind of not. I'd like to setup some kind of daily challenge system, where the game fetches some global challenge on a server. I'm assuming an HTTP request is the way to do it, any advice on the simplest way to setup the backend for that?

[brazen anvil]

Purely a guess but you could maybe do something like a data table to hold all your challenge stuff in it. Title, description, requirements, rewards, time limit, etc. And in your game you can setup some button or timer that once it is triggered it does a RPC to server to get a random challenge, or however you want to get it, and then a client RPC with the challenge.

[dark parcel]

I'm pretty sure he meant literar server since he mention HTTP request

[brazen anvil]

Oh not sure what that is. I was just thinking of like a daily quest system

[dark parcel]

had a friend doing an API call for me so I can broadcast Announcement. I used HTTP request for that

[brazen anvil]

would you want the client to do the http request or would it be better if the server did the request for you?

[pseudo merlin]

yeah correct

[winged crypt]

Hey, is the print string broken in 5.3? I only see client 0 printing

[rugged oasis]

how to replicate Simple Move to Actor?

with Get hit Result Under cursor

[thin stratus]

@rugged oasis Any more information on what you are trying to do?

Is the problem that the client tries to move?

[rugged oasis]

I've already found the problem. thanks

[sinful tree]

Does the challenge need to be determined by a remote server? Could it not be some list that your game servers would already know about based on the date, day of week, month, etc? You could have pools for the week of what could happen and swap those around based on the month, etc. No external communication required really.

[pseudo merlin]

I had same thought! users could change their local time to manipulate challenge though

which removes some of the magic lol

its currently a singleplayer game I should add

[sinful tree]

Well, then they could just cheat their way through obtaining the challenge too if they wanted 😛

But yea I guess if you wanted that restriction it makes sense.

[pseudo merlin]

but yeah, in theory if I could just ping some server anywhere for some daily value

[dark parcel]

doing it externally is nice too tho, you can change the challange on the fly and you wouldn't need the client to update the game

[pseudo merlin]

that could be a seed for a locally fetched challenge

[remote flame]

Anybody know/have experience with any other way of networking VR roomscale movement other than the VR expansion plugin?
To me it seems a bit weird to replicate your roomscale movement to the server to reproduce the movement, but I'm guessing that's the only way to do it with server authority?

I've briefly considered having client authoritative movement since I'm working on a co-op project. but I'm afraid stuff like enemies grabbing you will result in rollbacks.

(I have a physical character setup with roomscale movement that tries to sync your room and actor movement to keep the collision at your location)

[old sky]

Hello!

Why do I feel some jitter when moving my pawns?

When I enable Network Emulation (with the Average profile), it feels like my characters sometimes jitter a bit. They're getting corrected by the server.

Why is that? Is Unreal's CMC enough for multiplayer games or should I roll out my own networked character movement component?

Should these jitters be happening with the Average profile?

[thin stratus]

@old sky CMC is usually enough, but if you need any additional Network movement features you'll have to use c++ to extend it

The jitter is probably cause the average profile has Package Loss

[old sky]

Ah, that makes sense. Thanks!

Here's another question: how would I add something like Wall Jumping?

I understand that with server authoritative movement and clientside prediction, I have to send my inputs to the server and compare my results with the server's once they arrive.

What's the right way to handle this with Unreal's architecture?

[dark edge]

c++ and custom character movement stuff

[thin stratus]

Some stuff might be possible in BPs, but most of it needs a custom CMC C++ class and everything in C++ directly tied into how the CMC wants it

[queen escarp]

hm un UE4 there was an option on project setting for the Navmesh" Rebuild at Runtime" but in 5.1 there isent anyone know where it went =)?

or runtime generatiion "Dynamic" should be the same ?

yeah it worked* 🙂

[pallid rampart]

wow thank you so much for this

[vivid gulch]

How do I send an RPC in an actor from the client to the server?
The actor is an interactive item in the world (like a door) that has been placed already on the map.

Can I do that without the player controller or player pawn?

I just can't seem to wrap my head around it 😩

[gusty slate]

Hello hello everyone, Is there any way to specify this for a variable in blueprints? "REPNOTIFY_Always"

[thin stratus]

No

https://cedric-neukirchen.net/docs/multiplayer-compendium/ownership

[solar stirrup]

Shameless plug /j

[thin stratus]

Ehhh, I don't think so

Not sure tbh, but if it's not in the settings then probably not

[gusty slate]

Yeah it isn't :/ I have an array of structs and if I modify the struct by ref (Set members) the repnotify doesn't trigger

Thank you cedric

[vivid gulch]

Thank you. On your page it says
.... we create the ServerRPC in the PlayerController and let the server call an interface function on the door (for example 'Interact').
How is this interface call on the door replicated to the client?

[solar stirrup]

The door state would be replicated

Not the interface call itself

The RPC just tells the server to interact with the door

[vivid gulch]

Ah ok, so actually the server changes a replicated property which is then automatically replicated to relevant clients.

[solar stirrup]

Yep

[vivid gulch]

Thank you a lot. I find this approach a bit inconvenient. Because this way you always have to modify the player controller for all kind of stuff.
Imagine adding a lot of other interactive actors in the world. Each time you have to modify the player controller and add new functions there.

[solar stirrup]

You can make an Interaction Component on your player controller

And using an interface for interactions means you don't have to write different code to interact with different actors

One component to interact with any actor that implements the interaction interface

Just many different implementations of the interaction interface

[vivid gulch]

I see makes sense. But still can't just copy and paste my BP_Door to another project or distribute it on the marketplace. The other one must modify their player controller.

[solar stirrup]

You can put your interaction code in a plugin

Component, interface, and BP_Door

Then they'd just have to add the component to their PC and it would "just work" with some minor tweaks

[vivid gulch]

That would work. I still wonder why there isn't just a way in the engine that allows sending clients RPCs to servers for unowned actors in the same blueprint along with the player controller initiating the request.
The server can still verify correctness etc. But everything would be in the same place 🤔

[sinful tree]

Being able to call an RPC on an unowned actor would mean that you could then call RPCs on any actor. You'd have to implement checks on every single actor to ensure that the player is or isn't allowed to run that RPC. Ownership is the thing that ensures that security to begin with.

[vivid gulch]

True, but just add a new replication type here that allows it 🤔

[thin stratus]

I wouldn't waste time on arguing this

This will not be a thing anyway

This is a years old design decision and that's how all games in UE do it

[vivid gulch]

For me it is not wasting time, for me it's learning how the engine works.

[thin stratus]

?

You learned how it works and then argued for a new replication type :D

[vivid gulch]

I like to understand why something is how it is.

[sinful tree]

A replicated Interaction is something that involves the player controller or any other client owned actor or their components anyway.
Once you have called the RPC, you just need to call a generic interface to that actor, passing along a reference to the actor that called the interface if you need it to call back to it in any way.

Client Input > Server RPC w/ Actor Ref > Interface to Actor Ref, with calling actor > Server does whatever validation etc. and performs the interaction as implemented on the interactable actor

[thin stratus]

The main reason for this is that Epic devs decided that calling RPCs on non-owned Actors is more work than just limiting it. This makes sure no one can call RPCs on e.g. a Character or PlayerState of another player to adjust things they shouldn't

having to add all kinds of checks for this is more work

The interact system is probably one of the only times where this is a restriction

On top of that it also makes a lot more sense to call the RPC in the InteractComponent

[vivid gulch]

Thanks I think this is the way to go.

@thin stratus I see thanks.

[dire dragon]

bump

[pallid stone]

How many bytes can be sent at once over the network in unreal?

For server to a connected client

[fathom aspen]

I think it was 8000 bits last I checked the profiler

[glossy kettle]

the profiler can distort the truth sometimes

[fathom aspen]

In fact many things can... it's up to you to believe what's really true

[glossy kettle]

this is why myself and @pallid mesa switched to transparent ethernet cables

harder to get tricked when you can profile with your eye

[hollow eagle]

if the wires get red-hot then yep, shit's broken. And you might have plugged the cable into main power rather than your router.

[brazen anvil]

If I wanted to implement a leaning mechanic that allows a user to lean anywhere from like 45 degrees to the left or 45 degrees to the right, what would be the best way to handle replicating that? Like they could lean to the right 1 degree, 2 degree, 3 degree, etc.

I am going to guess the best way would be to add custom network data to my cmc but curious if there is a better option.

[thin stratus]

If the leaning doesn't affect movement directly, you pro bably don't need to put it into the CMC

Then it would be enough to just do it quick and dirty through a PressedKey RPC, with an OnRep value (Bool if you just need to know left vs right or float if you need more control) that skips owner so you can predict it

[brazen anvil]

i feel like that could be a lot of RPC calls in a short amount of time. is that an issue?

[meager spade]

leaning we did just via the animation and keeping the lean state in sync, nothing complicated

but depends what "leaning" you want

[brazen anvil]

i agree

[stoic lake]

LogNet: Warning: UNetDriver::ProcessRemoteFunction: No owning connection for actor BP_SurroundedCharacter_C_0. Function SE_FlashlightTrace will not be processed.

hey I got this error when trying to play in editor as listen server + a client. the server works just fine but the client cannot move.

[young spoke]

I'm getting the follow error on a mac unreal 5 when a client attempts to ClientTravel(). this works on my linux

```LogNet: Error: UEngine::BroadcastNetworkFailure: FailureType = ConnectionLost, ErrorString = UIpNetConnection::HandleSocketSendResult: Socket->SendTo failed with error 2 (SE_EBADF). [UNetConnection] RemoteAddr: 127.0.0.1:7777, Name: IpConnection_8, Driver: GameNetDriver IpNetDriver_6, IsServer: NO, PC: NULL, Owner: NULL, UniqueId: NULL:Samuels-MacBook-Pro.local-D606E39F45468DD4136D96A66DA244C2 Connection will be closed during next Tick()!, Driver = GameNetDriver IpNetDriver_6````

any help appreciated

[ruby lake]

guys im using servertravel but it always travel to the same map, how do i fix that?

[fossil spoke]

Post your code on how you are using it.

[ruby lake]

const bool ServerT=GetWorld()->ServerTravel("/Game/Unreal/CubeRage/Content/CubeRage/Maps/Maps/TestMapsPlugin/Travel?listen");

[fossil spoke]

Well if you are passing it a direct level name like that then of course it will always travel to that level....

[thin stratus]

https://tenor.com/view/exploding-brain-mind-blown-explosion-fireworks-gif-16297776

[thin stratus]

Is that using Steam?

Actually seems to be generally used for SocketSubsystems

[ruby lake]

its incorrect then?

[thin stratus]

If you don't want to travel to /Game/Unreal/CubeRage/Content/CubeRage/Maps/Maps/TestMapsPlugin/Travel then yes

[ruby lake]

do i have to enable listen server on the game instance to work or something like that?

im new to multiplayer sry

[young spoke]

no. i'm just testing ClientTravel() on localhost in PIE

[twin juniper]

I'm currently using the Steam Advanced Sessions plugin and was wondering if there was a way for a host who is hosting a session with multiple clients to join a new session and carry over all the clients from their old session. I was also wondering if the host could create a new session and migrate all the clients to that new session. Finally I'm looking for a solution to if the host leaves a game one of the clients first creates a new session and has all the old clients connect to that new session. Anybody have suggestions or even better yet blueprint screenshots showing how they've implemented joining a session with a lobby as well as migrating hosts?

[ivory bear]

not sure if this will help or not>>
https://www.youtube.com/watch?v=NUKTKFYbW_w

Ok, have a simple pawn and pitch and yaw replicate nicely when doing a listen server with 2 players.
When generating a Host and having a player connect (2 players, standalone) I get no pitch replication. Is there a reason for this? Did I miss something?

[twin juniper]

@ivory bear Thank you!

[daring arch]

Hi!

Is there any way to make a C++ event for whenever a specific variable changes?

Basically, I have a variable which tells me what is my current weapon index.

When it changes on the server, i want the clients to hide the old weapon and bring in the new one.

Do I have to check for this change on every tick or are there observer events I can use?

[woven basin]

You use OnRep_ functions - check out the multiplayer guide for how to use it.

[daring arch]

Is OnRep called on the server?

Or only on clients?

[fossil spoke]

In BP It is called on both

In C++ it is only called on the Client

You must call it manually for the Server in C++

[daring arch]

Gotcha

Thanks!

[pseudo ermine]

Im using a fixed size array to represent the player held weapons, but this array (even though Im using a FastArray implementation) does not replicate when I send the current Player ref to a RPC call

[fossil spoke]

FastArrays need to be marked dirty when you change them, otherwise they dont know to replicate.

Do you have code to share?

Its hard to pinpoint an issue with just what you have said

[pseudo ermine]

Yes I do, one question tho, Im mot adding nor removing anything the array per se, Im just canging a n index content

Does doing that makes marking as dirty not work

[fossil spoke]

You need to mark that element dirty if you changed it

[pseudo ermine]

So the element it self Ok Imma share the code

[fossil spoke]

    /** This must be called if you add or change an item in the array */
    void MarkItemDirty(FFastArraySerializerItem & Item)

[pseudo ermine]

StoredWeapons.Items[((int)InPickedWeapon->GetSpecification().Type) - 1].Weapon = InPickedWeapon;
    StoredWeapons.MarkItemDirty(StoredWeapons.Items[((int)InPickedWeapon->GetSpecification().Type) - 1]);

[fossil spoke]

You should be managing it inside of the FastArray Container

But sure

Thats what you need to do

[pseudo ermine]

This code is ran client side and it works

[fossil spoke]

Uhhh you shouldnt be doing that on the Client

How do you expect it to replicate?

Replication only occurs from Server to Client

Changes are made on the Server, the Server then replicates those changes to Clients.

[pseudo ermine]

Oh that makes sense

[fossil spoke]

How big is this array?

How many elements?

[pseudo ermine]

3 max

[fossil spoke]

Ok, why are you using a FastArray?

[pseudo ermine]

I thought the reason it wasn't replicating was the nature of the TArray like TMaps not replicating at all

[fossil spoke]

No

TMaps do not support replication at all.

Neither to TSets

TArray does

Infact, your usecase is better handled by just a simple TArray

I would not use a FastArray for replicating 3 elements which are just pointers to Actors.

Way overkill

And unnecessary.

And complicated for what its doing

[pseudo ermine]

Yeah doing this FastArray impl I was thinking, this is too much

[fossil spoke]

Just go back to using a TArray.

Especially considering it seems you misunderstood the issue

Which was Server to Client replication

[pseudo ermine]

Is passing a UObject* as a param on a Server RPC call viable on this scenario?

like It wouldnt send a GUID but the real UObject* object being the player character

[fossil spoke]

No pointer replication will EVER send the Object

That just doesnt make sense

Only static assets can be replicated by UObject*

AActors if set to replicate can be replicated like this

Since AActor supports replication out of the box

UObjects do not

[pseudo ermine]

I missused the naming

Its a ACharacter my bad

[fossil spoke]

If that ACharacter was spawned by the Server, its ACharacter* can be passed around yes.

Because it will exist via its NetGuid on all Clients

Since ACharacter is replicated by default

[pseudo ermine]

Great

[fossil spoke]

This is not true for other AActors though

You must enable replication on other AActors yourself

I think you should go through the Pinned Messages in this channel

And read the Multiplayer compendium

You are missing some fundamental knowledge.

[pseudo ermine]

Yeah I tried doing rough but Im lost lol

[fossil spoke]

Keep trying. Keep reading.

[pseudo ermine]

I was able to make it work standalone

[fossil spoke]

Standalone isnt networked.

So of course it would work

Listen and Client are the only networked setting in the PIE button

[pseudo ermine]

Gotta rewrite a lot of stuff

Ay THX a bunch I gotta sleep 2AM 'round here

[fossil spoke]

Good luck

[pallid stone]

How can I increase this?

[rich dune]

Hey,

has anyone a good tutorial for a Multiplayer Truck and Trailer system? I have Trailers working fine in singleplayer. In Multiplayer the Trailer always desyncs and the movement stutters like crazy.

The Trailer is attached via a Physic Constraint and the calls and actors are all set to replicate. Any ideas or tutorials?

[woven bramble]

Does anyone know how I can Replicate Control Rotation? it's not working. (it starts from GameState)

[blissful talon]

Isn't control rotation a local value?

[small grail]

I don't think you can...

[blissful talon]

You can, but you need to replicate it from the local controller, i.e. it's the client that would tell the server its control rotation

[woven bramble]

Is GameState (RunOnServer) -> For Each Loop -> PlayerController (Multicast) wrong?

[blissful talon]

Server doesn't know the client's control rotation, so it's rather incomplete

[small grail]

PC's net owner is local.

[small grail]

What you are trying to do? I mean the feature.

[dark edge]

What is the truck, a Chaos vehicle?

[dark edge]

Server knows part of it, at least the pitch is networked by default

[blissful talon]

I do it this way:

.h
/** Replicated control rotation for animations. */
UPROPERTY(Replicated, meta=(AllowPrivateAccess))
FRotator ControlRotation = FRotator::ZeroRotator;

.cpp
void AMyPlayerState::Tick(float DeltaSeconds)
{
    Super::Tick(DeltaSeconds);

    const APlayerController* PlayerController = GetPlayerController();
    if (!IsValid(PlayerController))
    {
        return;
    }

    if (!PlayerController->IsLocalController())
    {
        return;
    }

    ControlRotation = PlayerController->GetControlRotation();
}

The reason to have it on PS is basically to allow everyone know the control rotation of a certain player.

[woven bramble]

The only thing I want is to gather all the users in the game around a point and make them look somewhere.
But I can gather them to one place, but I can't make them look.
Actor Rotation doesn't work, because I have control rotation on. (So it just work for Server, not working on client)

[small grail]

So you should send an RPC from server to client and ASK client side to do facing.

And you might disable input at the same time too

[woven bramble]

Multicast?

[small grail]

Yes, just multicast to client side for example client game state

And in game state you executing "Force facing" event then how it is implementing is on client side.

[rich dune]

yeah

[dark edge]

Does the truck itself network perfectly with latency simulation?

[blissful talon]

Hello, I'm trying to make a grab attack for my AI, but I have some network related problems.

The ability itself works perfectly in single player, though in multiplayer it behaves in a weird way when applied on clients, i.e. the host still can be grabbed, and the animations play correctly.

The feature is separated in 2 abilities: Grab_Attacker and Grab_Victim.

The first one is used to play replicated attacker's animation, determine the victim, setup the victim position, toggle certain components, and deal the damage.
The second one is used to play replicated victim's animation.

What works in multi player: attacker's animation, victim determination, deal the damage.

As for the victim position I set the victim in front of the attacker, so that the animations will be consistent. I use the AActor::Teleport() to define where the victim should be, but for some reason it doesn't work for clients, I've checked just in case whether the feature is even supported by the CharacterMovementComponent, and it seems to be; in fact it does override the UMovementComponent::OnTeleported() and does something.

As for the victim animation it doesn't play at all for the client, but it plays it for the server, but after 2-3 seconds since it should've started.

That's how I play the victim animation: https://pastebin.com/w7vW4Uez. The ability does activate immediately after the attacker identifies the victim, however the animation takes a few seconds to start for the server, and it never starts client-side (even though it should). The ability resides on the victim character by the way.

Here are some logs I get mid grab: https://pastebin.com/CqG4zQVu. CH_LivingMannequin is the attacker, CH_Customer is the victim. I have no clue why it tells that the attacker is stuck, and that the CreateSavedMove hits the limit of 96 saved moves.

Also, to avoid some issues I disable the capsule component and the character movement component on the victim for the time it's being grabbed, so that the grab animation can be played properly, allowing the attacker move the victim as they want without interfering with physics/collisions.

Does anyone have any idea what may be wrong in my approach?

[woven bramble]

This didn't work either :/ Game State (Server) -> ForEach Loop (playerstate) -> Multicast

It actually seems very simple and I'm probably making a small mistake.

[woven bramble]

Logically, it should be replicated automatically, but I couldn't find out why it not works in clients.

[dark edge]

GetBaseAimRotation

that'll get you a replicated pitch

[small grail]

You need to get the controller from local instead of passing from the server.

[dark edge]

Multicasting in playercontrollers makes zero sense

there's nobody to multicast to

playercontrollers only exist on server and OWNING client, not on other clients

[woven bramble]

Ok, so where exactly should I continue this action that I started with GameState (Server)?

[small grail]

Just multicast to the client gamestate, getting the controller in client game state and do what you want.

No idea why you want a loop though

[woven bramble]

Because it needs playercontroller

like this

[small grail]

But you have already multicasted to every client. And you should input this with getting local player controller

[woven bramble]

looping -> owning client (in playercontroller) not worked too

Do you mean something like this

[dark edge]

What are you ACTUALLY trying to do here? What is the game mechanic

[dark edge]

SomeReplicatedActor:
EventMakeEveryoneLook(Multicast)
Get local playercontroller(s) -> set control rotation

You can get playercontroller 0 if you want, there might be other ways to get all local playercontrollers (typically 1 but might be more if you have couch co-op)

This will work as long as you don't have multiple local playercontrollers

[woven bramble]

After pressing a key, an event runs in GameState (on the server), I want to teleport users to a point in the game and ask them to look at a point. (In order to hunt the Demon in the game, they need to go to that point and look at a point. So they will gather in a circle.) These are the code in GameState. https://blueprintue.com/blueprint/-zn8oq2r/

[woven bramble]

Where should I add this to the code above?

[dark edge]

Gamestate event -> teleport all player pawns to the place -> call MakeEveryoneLook which will make the LOCAL playercontroller rotate to look at the point

[fathom aspen]

Why would you?

I like you dyed your hair

Nah, that can't be real

Are you telling me that I should go back to using Timers like a peasant now?

Aha, so the hype is gone

The hype is all over #verse now I get it

[woven bramble]

Thank you so much it worked

[woven bramble]

Thank you so much!

[pallid stone]

I have a crowd manager that is moving actors around (instead of them using their own movement components). Sending a fvector is 12 bytes, so that limits me to 8000/12 = 666 replicated updates (under idea circumstances, nothing else being replicated to increase the sent chunk size). I want to handle numbers in the thousands, which would be sending 60000 bytes for, say, 5k controlled actors.

Also, on an unrelated note for a completely different issue, if you have sequencer moving around an object that replicates its movement, will that show for all connected clients?

[fathom aspen]

That limit is there for a reason. I mean the bigger your packets are the more time the server/client are going to spend serializing/deserializing these packets

Which is done synchronously

Meaning you will 100% start getting hitches if you manage to do that

Anyways there is UNetConnection.MaxPacket fwiw

[woven basin]

@fathom aspen - any updated thoughts on GMC since you bought it? Any regrets or issues you’ve encountered?

I’m thinking I’ll pull the trigger and buy it; just trying to make sure first…

[fathom aspen]

Nah nothing really. I have barely even touched it. The author seems too responsive to messages sent in their discord and that's what matters to me the most (I bought it for educational purposes ^^)

Will look further into the CMC/GMC 's science once our game releases next month

[woven basin]

Yeah, cool. A responsive author is a very good sign.

Is there any further news on GMC v2?

[fathom aspen]

From 2 days ago:
The GMC v2 beta for everyone is drawing closer, and I'm pretty confident that I'll manage the release before the end of September. Stay tuned for more news.

[woven basin]

Oooh. Ok cool, guess that seals it then; I’ll just buy it now. Thanks.

[solar stirrup]

Apparently the v2 "supports" the GAS

as in some peeps in the v2 beta are using it with the GAS, but it's still not as supported as the CMC & GAS are

[woven basin]

Yeah, that’s actually what I need v2 for the most. And apparently enhanced Input as well?

[solar stirrup]

Yeah EI is supported/going to be supported in v2

[half umbra]

It doesn't matter if I trigger an interaction (server) in an Acora component owned by the player

because Player is owner this component

yes?

[grave lynx]

Hey, OnPostLogin, I'm SetControlRotation the controller. Working fine on server, not on client. Need multicast?

[dire dragon]

why is that happening

[thin stratus]

I assume cause yo uaren't replicating this stuff?

[dire dragon]

but the grab one works

i'm using repnotify

[dire dragon]

this is how it all looks like, the top one works fine but the bottom one only does the client thing and the server see's like nothing changed

[solar stirrup]

if you mean a server rpc

you can call Server RPCs in any actor you have ownership of, and any components of those actors

[austere halo]

Hey everyone, I'm just wondering if the gamestate has a different way of replicating variables in c++ compared to other classes? I've put in the usual:
UPROPERTY(replicated)

void MY_Gamestate::GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const{
Super::GetLifetimeReplicatedProps(OutLifetimeProps);
DOREPLIFETIME( MY_Gamestate, TF_World);
}

and set bReplicates to true in the constructor, but it's just this class that is not replicating its variables. I'm wondering if it has to be done differently?

[proven kayak]

Why is your class called MY_Gamestate and not UMY_Gamestate

[austere halo]

Dw was missing #include "Net/UnrealNetwork.h" in the header 🤦‍♂️

[proven kayak]

Shit

AMY_Ganestate

[austere halo]

Yeah it does have a A prefix I just typed it differently in discord

[proven kayak]

👍

[austere halo]

thanks

[proven kayak]

Did you.... type out that whole function definition instead of copying it
In any case glad you figured it out

[tardy fossil]

underscores in class names 🤮

[austere halo]

haha no just changed the name cus it's called something stupid 😆

[proven kayak]

Capitilized words in class names

[tardy fossil]

this is how its done

[austere halo]

where's the dark mode

[tardy fossil]

had to disable it to see my emoji class names

[austere halo]

xD

[echo epoch]

Can anyone point me in the direction to learn about Generating Invite / Lobby codes? (Something like the code that Phasmophobia generates when you create a lobby)

[ebon jacinth]

Anyone have experience swapping from Listen Servers to Dedicated Servers? Wondering how much work it might be. A majority of the game uses GAS for abilities.

[dark edge]

If it was done correctly, it shouldn't be too hard.
If it wasn't, it might be hard.

[grand kestrel]

Looking into this now
How did you handle the cooldown bool in the saved move
Was it a compressed flag or something else

[thin stratus]

Just a bool tbh

[grand kestrel]

So using setmovefor/prepmovefor?

[thin stratus]

Yeah it was set alongside the CD timestamp

It was mainly so that PerformMovement ticked function wasn't calling the remaining cooldown < 0.0 part over and over

Maybe there is a smarter way to have that with one variable

[grand kestrel]

Not sure. I think it makes sense that it would be needed

@thin stratus
So far it works quite well, I can't get it to desync at all
I've also just noticed I forgot to prevent jump during prone heh, so that's getting fixed here too

Since you're here, I have a git question, I've made these changes in my link branch which I usually just git rebase -f origin main to pull changes from main into, but this time I need to do it the other way, I don't think I really want to rebase in reverse, of course I can just cherry-pick the commit, but does that cause any issue when I rebase normally in the future (probably not?), is there a better way, such as simply committing the changes I made in link to main instead?

[thin stratus]

That's cool to know that it works

[grand kestrel]

Heh I actually need a timer exactly like this for a different system so the timing was fantastic

[thin stratus]

Git is absolutely not my comfort zone

More than the typical fetch pull commit push merge is nothing I can do with that

[grand kestrel]

Mm sadly mine either, I can use it in production but I always need to ask questions from time to time, I'm no expert, just a user

Well that's fine, I will just commit to link and cherry-pick to main

@thin stratus
If you don't mind reviewing
https://github.com/Vaei/PredictedMovement/commit/647e09807ca602fcf0b4086d21992ca794806e5e
https://github.com/Vaei/PredictedMovement/blob/main/Source/PredictedMovement/Public/Prone/ProneMovement.h
https://github.com/Vaei/PredictedMovement/blob/main/Source/PredictedMovement/Private/Prone/ProneMovement.cpp

[ebon jacinth]

I imagine the biggest updates would be getController(0) type stuff and then making sure the server doesnt access audio or visuals?

[fathom aspen]

More or less yes. Listen server usually we are guaranteed a controller, while DC we are not

Also try not to use GetPC(0) if you can actually help it

[ebon jacinth]

Is the best way to save player controllers when possessed

[fathom aspen]

Save? Wdym by save?

[ebon jacinth]

Save a reference to, so I can grab the same controller later. Like if I have gamestate save which player controller is which player

[dark edge]

just save it

but why do you need to do that?

pawn always has a ref to its own controller

if it exists

[ebon jacinth]

Get get pawn uses a player index, so I would need to at least save that if I'm not assuming 0 is always local

[sinful tree]

When working with multiplayer and in reference to an actor that is related to a player, like the playerstate, their controlled pawn or their controller, each of them have a reference to one another. If you code your stuff right, you never need to use any of the "Get X by index" style nodes.

Gamestate has a player array already which is the array of playerstates of all players. "Which player" is a bit harder to determine from that array, but it is doable, especially if you have a reference to something else about the player, like their controlled pawn or their controller, but again, if you had a reference to either of those, you could just get the playerstate from those.

[ebon jacinth]

But could I save the player index when the pawn is possessed, then I could always get it from gamestate

[sinful tree]

But why do that? The player controller has a reference to the pawn.

The pawn has a reference to its controller.

No need to worry about indicies.

You technically shouldn't be trying to get reference to a specific controller/pawn/player on the gamestate unless you have some sort of information about the player to begin with.

[ebon jacinth]

But even get player controller is using an index

What method do you use to not use any indices?

[hollow eagle]

Pawn has its own get controller method that gives you the controller. It does not do anything by index.

There's zero reason to store the controller anywhere else, the pawn already knows what is controlling it.

[ebon jacinth]

But if you are on a child actor trying to get access to that controller would you then be getting the parent, and then using the parents (pawns) get controller function to get it's controller? Instead of using get pawn on that child actor.

Or on a UI widget on the viewport, would you be grabbing the HUD and then get owner player controller or get owning player controller etc

[dark edge]

What's the context, what are you actually trying to do?

[ebon jacinth]

Each pawn has 12 child actors that can fight another pawn's actors. And those go another 2 child actors deep ( so a child of a child of a child of a pawn). When I'm on the deeper children or on different widgets on the UI on the viewport I have been using the get player pawn to get the pawn and then calling functions I need from there. But those use an index. In our listen server setup get controller 0 is always the local player controller I believe so it works. But the worry is if it will still work when we go to dedicated servers or if all of those need to change.

I was just wondering if I should save the player index on the children at possession so I can always get whatever I need from that child actor by using the index instead of having to work my way back to the Pawn or HUD through parents etc.

[hollow eagle]

So don't use the functions that take an index...

All widgets have access to the player controller that owns them

And that player controller knows what pawn it possesses

You're making a problem for yourself by assuming you need indices in the first place.

[left lance]

I need to create essentially a player controllable platform for multiplayer. This platform is something players could walk on as they moved it around the world. What is the best base class to do this in? I'd love to take advantage of the Character class and it's replication, but the 'platform' won't be capsoliodal at all (though it will utilize control rig, not that those are related, but figured I'd bring it up). Would that be an issue?

Is there a different class that I should utilize because it would work better? E.g., a pawn?

The good news is the movement of the 'platform' will be relatively slow

[unique basin]

you could send movement commands to the actor or make the platform a pawn and possess the platform

[left lance]

Since it's slow enough, will those movement commands be replicated smoothly enough? I suppose I can do some client side lerping... 🤔

[dark edge]

Do you need to control the platform and character at the same time?

[left lance]

The player will always be in control of their character, they may control the platform at the same time, but with different controls

I doubt players will be moving themselves while moving the platform (cause it'll be hard), but I'm not preventing it/planning on preventing it. And other players can be moving on the platform while a player is changing/moving it around.

If it's not being actively changed, then the platform will be moving at a constant rate/direction

[dark edge]

Just make it an actor

[left lance]

Then move it via SetPosition/Rotation?

[dark edge]

However you want

[left lance]

From a replication stand point, what's usually best?

Really want to avoid jitter (so, will probably have to do some client side lerping)

[dark edge]

The most important thing is that it plays nice with characters standing in it.

[left lance]

Is there any special considerations I need to keep in mind for that?

[dark edge]

I mean just go try stuff. Get everyone to agree on the movement of the platforms then get it to play nice with the CMC

[left lance]

Ok, thanks!

[woven basin]

What else would you add here?

I'm thinking network lag settings....

[thin stratus]

Yeah those could also work

You should probably add a button to open the full project settings

And focus the network section

[dire dragon]

how do i fix the physical animation lag when multiplayer?

[woven basin]

its only these two options in the project settings? Or did you mean the Editor settings for multiplayer?

[thin stratus]

Eh yeah editor probably

[woven basin]

these ones? kk

gotta work out how to focus a section - i'll try to find an example

[thin stratus]

I think the advanced play settings might do that already?

Or do they just open the whole section?

[woven basin]

it just opens it to the top

[thin stratus]

Hm.

[woven basin]

got it - you can select the "section name"

so I can do it - I'll try now

[dark edge]

Why would it being multiplayer have anything to do with it?

[pseudo heath]

i'm trying to make my first multiplayer, but when i try to create the session for the listen it fails...

[soft flare]

Yo guys can i ask here for help?

im kinda stuck for days because i cant replicate something to other clients

if someone has some mins pls tell me xD

[dark parcel]

@soft flare you will have more chance getting help if you share your code/bps

describe what you are trying to do then specify the problem in details

[soft flare]

uhm yea i can try to explain it

[dark parcel]

Sharing some screen shoot would be a good start

[soft flare]

so i have a host and join systen, and whenever someone joins a host the client sees something else than the host. Example i equip skin 1 on host and start a server, the client joins and sees everyone with his skin but the host sees all skins corret, whenever someone joins and there was a player in the level already it doesnt replicate his stats

the window in the bottom right corner is the person that joined

you change skins in the menu before you join a lobby

[dark parcel]

How are you equipping the skin? Thru RPC?

[soft flare]

RPC?

there is a interface in main menu wait

[dark parcel]

🫠

[soft flare]

On equipment

then we make lobby in multiplayer

[soft flare]

Yea thats something else xD

[dark parcel]

How do you actually equip the cloths? By accessing variable from Game Instance I suppose?

just a heads up, I hvaen't actually tap multiplayer yet but I will see if I can work it out

[soft flare]

nah it works like this, you equip the skin and you have a "selected skin" var in the character, whenever you start a level it saves it and loads it when youre ingame

The problem is

when the new player joins

he sees the wrong variable on "selected skin"

He is allways seein his skin

[dark parcel]

can you share how you load the skins?

[soft flare]

Whenever someone joins it does a multicast on EQUIP SKIN event

[dark parcel]

ok

So multicast is an RPC

[soft flare]

Ohh you mean replication

[dark parcel]

Remote procedural call

[soft flare]

Oh

[dark parcel]

basically a way to run function in Multiplayer setting

But here is the scenario

You execute Multicast from the server, the function apply to all existing machine.
The problem is the player that have yet joined the game, they don't execute the RPC call

[soft flare]

wait can we go private call and i discord stream you?

[dark parcel]

No,, sorry

imo your option here is to do RepNotify

[soft flare]

Yea ik but

[graceful flame]

Use repnotify to handle state not updating scenarios for late joiners or when players re-enter into the netcull distance of a replicated actor. Multicasts only work if you're already connected to the server when it happens.

[soft flare]

Yea heared some people talk abt it but i dont understand how to use it it keeps dooing it wrong

[dark parcel]

Multiplayer is hard, replication is the easy part

[soft flare]

Do i need to call the function again when people join later?

[dark parcel]

but that still took a while for me cuz I'm not bright

[graceful flame]

You just change the variable from replicated to repnotify. Then you double click on the variable's set node and its like a function.

[dark parcel]

OnRep-> Change Skeletal Mesh

[soft flare]

So thats what i do now:
you change your skin in a "rep notify" node
and you start the game, then when someone joins he sees the correct skin and i dont need to recall it? or do i need to call the even in a muticast or something?

[graceful flame]

So that function runs whenever the variable changes. If its a boolean for example like "isDoorOpen?" then you can just start with a branch. If isDoorOpen? = true, execute event to animate door. If isDoorOpen? = false, execute event to move door into closed position.

[dark parcel]

Repnotify the Skin

Go to the Repnotify function

Get Mesh -> Set Skeletal mesh to the variable

Done

[soft flare]

Alright i try that real fast

i give update in a min

[dark parcel]

and after that look at documentation and some youtube (cough) for more info

[soft flare]

Ive been lookin in the internet the whole day... xD

[graceful flame]

You just set the values as want for whatever makes sense, but then inside the repnotify you handle the switching logic.

[soft flare]

thats why i am asking here

[soft flare]

Yeye alright

Thanks ^^

i try that now

Hm

still same thing

Thats what happens on the menu widget ui

thats what happens inside the rep notify

[dark parcel]

Not enough experience in mp but I don't think that's gonna work

[soft flare]

yeye nw ^^

still thx for trying to help

[dark parcel]

So when you change cloths are you only changing the material?

[soft flare]

No also the mesh

wait

[dark parcel]

Well then you want to repnotify the mesh and the material

[soft flare]

Yea wtf

hahaha

but not even the mesh is changing

let me throw the other part in real fast

[dark parcel]

The logic to resolve the actual material can be done somewhere else

the repnotify logic should just set the material/skeletal mesh

imo

[soft flare]

Nono it changes in skeletal asset

[dark parcel]

Resolve material -> Set material(repnotify)
OnMaterialRep-> Get skeletal Mesh -> Set Material

The same with the skeletal asset

Do the logic to get the Skeletal mesh -> Set the Skeletal Mesh (repnotify)
OnSkeletalMeshRep-> GetSkeletalMesh->SetSkeletal mesh

[soft flare]

I cant 100% follow but i try that

[dark parcel]

other machine doesn't need to know how you get the material or skeletal assets

They just need to know the current Repnotify variable

[soft flare]

hmm okok i try that brb xD

thanks for all of this ❤️

what exactly do you mean by resolve, you mean the Run on server and multicast part?

[dark parcel]

no that shouldn't even be RPCed I think

the only thinng u need to RPC(Server) is the repnotify variable if you are client

Move this somewhere else for a start

[soft flare]

To the character?

[dark parcel]

I dunnoe, I guess

[soft flare]

now its in my thirdperson char

[dark parcel]

You are changing the materials by ID tho, that's quiet a number of variable u have to replicate

[soft flare]

the array is like a skin inventory

[graceful flame]

If you organize the blueprint nodes a bit more and use color coded comments it will make things easier for you in the future.

[soft flare]

yea ik

[dark parcel]

@graceful flame Do you know a way for the other machine to join later? other than emulating lag

in Pie

[graceful flame]

Start pie with one client then you minimize and look for the add client button, I think Play becomes add client or maybe its beside pause. Something like that.

I'm in vs building my project so i dont have ue open at the moment.

[dark parcel]

@graceful flame Thanks , I never know we can do that

[graceful flame]

Or if you're running the packaged built game client exe you can just keep opening new ones

but it will have the same auth (if you have any auth setup)

[soft flare]

the thing is

there is elements in the game, like fire ice and stuff

it works fine for them

Even late joiners see the correct element

its just everything else xD

[dark parcel]

are they even replicated? are they pre-placed?

then those stuff you see probably already exist in each client and they just play it as it is

[soft flare]

uhm

the way i did it was that

begin play calls it for me and whenever someone joins it does another beginplay for all actors

Let me try something real fast

IT WORKED

LOL

i dont even know why

So here is what i did

[dark parcel]

This is what I did

[soft flare]

The int gets sent with the events

[dark parcel]

You can repnotify the number if you want

[soft flare]

Idk how this is gonna fit but i think i leave it like this for now

[dark parcel]

I changed the cube color and late joiners still see the same material

[soft flare]

Ohhhh

ill save that pic thats actually smart aswell

[soft flare]

bro im almost crying jesus this is gonna speed up m

[soft flare]

damnnn

You say you have no idea abt mp and still know more than me

But yea thanks allot my guy how you have a wonderfull weekend ❤️

@graceful flame u aswell

this discord is truely amazing xD

[austere halo]

Hey everyone, I'm building a multiplayer survival game similar to valheim or ark, and am now working on the building/crafting aspect where you can place down meshes like doors, walls, etc. The straightforward way would be to just have every building piece be its own AActor with a static mesh and functionality. Considering players could build bases with 1000s of these pieces, I'm wondering if this will cause performance problems down the line, both in terms of rendering and in terms of networking?

[dark edge]

Probably, test it.

Rendering should be ok nowadays but it all depends

Just fire it up and spam building parts all over the place and see where the bottleneck is

[austere halo]

My plan is to be able to host listen servers with large worlds where players could be in different areas at once (minecraft-style), which is probably a lot for the server to handle and makes it a bit harder to test... Was trying to avoid building everything just to have to rebuild it all in a different way, but you're probably right

[dark edge]

I think you're insanely over-scoped but speculating without testing isn't worth much

If 1 actor per part is too much, consider 1 actor per part island (building, Space Engineers Grid) or even some sort of manager that handles it.

[austere halo]

Yeah its not the easiest project 😆 I'm a decent programmer and have already got a procedural world that loads/unloads as you move around + a replication graph going, but even that has been a challenge so far... Yeah that was my other plan, to have one actor per 20m tile that handles everything within it

[dark edge]

Until you've tested you have no idea. Just go test (with a realistic client count)

[austere halo]

Yeah will do, thanks for the advice

[ruby lake]

guys i want to to use servertravel or seamless travel, where do i remove the current widget before the travel?

currently when i use servertravel the widget stays between maps, i dont know why

[fathom aspen]

Seemingly because their Outer is persistent, but the research is still on going...

There is a static helper function "RemoveAllWidgets" iirc

You could try it out on EndPlay of HUD for example, as the latter gets destroyed regardless of the travel

[ruby lake]

do i have to start the session so the server can travel to? or just creating and using servertravel or seamlesstravel already work? cause im just creating the server and traveling but it doest change the map.

[queen escarp]

This is run on the game mode but the game mode cannot destroy actors on the server like this right :/ ?

[dark edge]

Game mode can do whatever TF it wants

game mode is the top dog

[ruby lake]

guys shoud i use servertravel or openlevel with ?listen ?

[sonic jasper]

Is there something similar too ClientInitialize that is called on a listen server client, want the server to wait before spawning some actors but cant seem to find a central place to call the process from that works for both listen server client and clients.

[spare moss]

Hey, im trying to get a multiplayer prototype up and running. Having an issue where an actor has authority on the local client (Ownership chain traces back to the local client's player controller and Has authority is returning true), but any calls to execute on server events are getting dropped

Relevant BPs ^

I see the print string appear from the first picture, (Authority: True), but the second print string never appears on the server or client (using listen server)

edit: Realised I may be quite dumb and I think I have different versions of actors across both client and server

[lavish cypress]

After calling Tear Off on an actor is it possible to restore the actor replication?

[fathom aspen]

Nah, it's meant to be an irreversible operation

[magic helm]

If you want a reversible option, look into dormancy

[pseudo ermine]

Now my mind got puzzled hold on

When I call let's say a AActor.ServerRPC

If I change the values of the said actor (It is replicated) inside the RPC method

Am I changing the AActor server instance?

The server is a dedicated one

[sinful tree]

Yes? Values you change while running on the server would be changing the server's copy of the actor. If the properties that you are changing are marked as replicated then the value you're changing it to would also be sent to any clients that have the actor relevant.

[lavish cypress]

In the engine code, USocialParty implementation, they demonstrate beacon use to reserve slots in a server. Before travelling all clients to the map, they call DestroyBeacon(), which internally cleans up the Net Driver.

However, when I do this, the client GameNetDriver gets destroyed and the client loses connection as soon as they join the map.

I'm trying to figure out how to destroy the beacon net driver without kicking the client out of the game.

The workaround I thought of was to tear off the beacon client to make sure the beacon net driver isn't using any bandwidth while they're in the server

[fossil spoke]

It effectively closes the entire Actor Channel.

The ActorChannel would need to be setup again.

Not sure how viable that operation is

[fossil spoke]

It shouldnt be destroying the GameNetDriver?

[cedar tangle]

First time looking at setting up a dedicated server got some questions:
It seems like the main idea of a dedicated build is to compile out code that shouldn't exist in a client?
Also, from what I have seen so far, the editor can not directly connect with a running dedicated server instance?

[lavish cypress]

Yeah I would have assumed it would clean up the Beacon Net Driver but for whatever reason the client loses connection shortly after arriving in the map

[latent heart]

The biggest difference is the lack of rendering frontend. As you say, it's compiled out.

As for the editor/dedi, not sure.

[cedar tangle]

From what I can understand so far, a dedicated server is not needed for development.
Its a build specific version that holds logic, that the client has not.

For example, all calls via HTTP requests would only exist within the server build only.
This, reflecting the authoritative design of the network communication of UE.

[latent heart]

Not quite.

The dedi server removes rendering. The client version removes potentially logic, but there's also a listen server that has both.

You could, and should, exclude private stuff from a server build if you are never going to distribute it. Either via plugins or #if code.

But it's kinda irrelevant if you're going to distribute a listen server capable build.

[cedar tangle]

Ok, still compiling the source at the moment.
That is where I am confused. Has the client code got exist in the server build? (the CLI commands I have seen reflect that it has to run the same project and map).
Everything I do has to be dedicated only, because the system would have to be out of reach for users.

[latent heart]

Generally you don't want to use #if UE_SERVER do stuff #endif, but rather #if !UE_CLIENT

That works for listen servers implicitly. In both server and client code (!UE_SERVER for clients) . Or maybe I'm wrong about that, but I think UE_SERVER is just dedi server builds.

And UE_CLIENT is just client only builds.

It's been a while.

[woven basin]

The editor doesnt connect with a deidcated server insance- but you can attached a debugger and handle things there. You can also attach a ImGui network visual logger to have data from a dedicated server streamed to a client for debugging

[cedar tangle]

Thanks for the feedback, one moment, I will check the code that would occlude the logic form client/server build type (may be where I am getting confused).
Also that debugging method is something I would be looking at later on, but good to know log data can be relayed in that way.

[cedar tangle]

@latent heart @woven basin it was is exactly where I was getting confused, I shall explain:

The code block wrapped within the condition #if UE_SERVER *CODE #endif is compiled out of the client.
So this means the code should not exist in the client build at all (exactly what I need).

However, the development process (the UI project) would hold both client and server logic.

@latent heart #if !UE_CLIENT I guess wouldn't specifically exclude a client from being a server (maybe safer option for some projects).

So for development (not testing), then as long as the editor can run the #if UE_SERVER blocks, then a dedicated server is not needed for development.
It is needed for testing tho, to make sure one build type can not accidentally do something it should not.

I need to test out the editor with the #if UE_SERVER to make sure what I am thinking is correct.

[latent heart]

Try compiling editor code with #if UE_SERVER.

If that code runs, you're fine.

Also, a dedicated server is needed for development.

Because you need to test things in a live environment. Listen servers, what you'd get in the editor, are juts fundamentally different in some respects to dedicated ones.

In both game logic and excluded code.

It will, in fact, highlight where you've written bad code.

Or "it works on a listen server, but not in dedicated servers" code.

Or failures in your testing procedures because you're testing on listen servers instead of purely remote clients.

Especially in c++ code where onreps work differently than in BP.

(slightly)

You can pretty easily debug a dedi server by launching it directly from your ide. Just launch your client also from the ide and connect to the server. Without using the editor, if that's what you have to do. It may or may not require packaging.

[cedar tangle]

So a dedicated server is needed for development but the editor can not communicate with a dedicated server instance.
Hmmm, I am thinking maybe a project code find and replace of #if !UE_CLIENT with #if UE_SERVER to take advantage of running a listen server along side the editor for productivity reasons.
Unless is another way to go about it. Seems one would have to keep building out server stand alone builds otherwise.

[glacial burrow]

this might be the wrong place to ask, but can anyone recomemnd me a webSocket library for RPCs that can run on C# and C++ ?

[cedar tangle]

Actually, I may have worked out another way to go about doing it (I forgot how C++ build's work as I have been doing allot of BP's recently).

[latent heart]

You should still test with a dedi server.

[steady nimbus]

Hello! So I'm getting to a point where I'm trying to understand how to setup a dedicated server to spawn sessions dynamically as needed. A fairly typical scenario is:

1. Select their character and get transported to the lobby map (this is probably where the initial dedicated server session would start)
2. Once enough players queue up in the lobby map, those players that queued to go the "match"
3. After the match is complete, going back to the initial main "hub" lobby in (1)

What i'm slightly confused about is (2), is how to have the dedicated server itself know when players are queuing to start a new session for the new map and initiate travel for those players

[rugged oasis]

how to replicate this? the clicked actor variable is not passed from the client to the server

[latent heart]

Where is that node?

Also never use the get player controller node that has the index option.

[plucky prawn]

Unless you don't actually care about your multiplayer stuff working properly

[latent heart]

Or potentially single player in edge cases.

If that is a player owned actor or widget, which is required for your rpc to even work, you can get the player controller a better way.

(you can't send an rpc from a widget, but it will allow you to get the correct pc)

[plucky prawn]

But widgets have their own function also

[soft flare]

Yo guys anyone can help me out? im having this problem for a really long time now.
every time i use (random int/float in range) it gives diffrent variables on every client. someone knows what to do?

[latent heart]

Yes, don't use them on different clients? Or set the seed.

As long as they then do the same number of randoms, they will get the same value. Of course, if anyone joins late, they will need to catch up on the random value rolls...

(if you set a seed value)

[fierce egret]

Use "random" node in server and send value to client(s)

[soft flare]

I dont use set seed, i use run on server and then after the variables are set i do multicast

Event beeing calles

randomizing on server

Send to all clients

idk whats wrong it gives me totaly wrong variables now aswell

seems like the "randomize" part is beeing completly skipped now

[soft flare]

if found it out, the variables that are randomized and are applied have the setting (replicate) wich for some reason messed up the replication totaly, so when i put replication on variables what exactly does it do? seems like it completly messes up my multicast

[soft flare]

Forget that, i had a (destroy actor) in my nodes.... xD

[pallid mesa]

Hey peeps... i think its about time to discuss how neat it would be to guarantee variable replication for POD types in BeginPlay the 100% of the cases in Actors, net startup or not...

I haven't tried Iris in this aspect, but the legacy networking system doesn't have any place in which you can guarantee variable replication and gamestate to be valid at the same time

it does the trick for non netstartup actors but for preplaced actors replication can absolutely happen after beginplay

which is a very big inconsistency if you think about it from an architectural point of view

makes networking harder, by default

[fathom aspen]

I do agree, makes you hate yourself for using net startup actors, which are incredibly useful when utilizing Initial dormancy

[pallid mesa]

they are needed, indeed

[fathom aspen]

The best I found to workaround that was to hack my way by marking all my replicated varaiables as rep notifies variables, and using PostRepNotifies combined with BeginPlay/GameStateEventSet(delegate)

[supple vapor]

isn't there a setting 5.0+ somewhere to delay event begin play until ready for replication?

[fathom aspen]

Yeah there is IsReadyForReplication, but I guess that was to indicate if the actor is capable of firing RPCs

But good point, I never dug deep into that

[woven basin]

just so I can follow along this topic - are you saying if I have a replicated object pre-placed in the world, the client will load the pre-placed object. But if the server has subsequently modified it before I joined, the object would do BeginPlay() on the client, and then receive some additional stuff a few frames later from the server, causing a state that might never have occured to appear on the client?

[fathom aspen]

100%

[woven basin]

so we need a flag to say "dont begin play this object until the server confirms it is ok to start"?

[fathom aspen]

The problem here is inconsistency compared to spawned from replication actors and convolution that you need to make them "consistent"

[fathom aspen]

Yeah, more like let's guarantee BeginPlay is called only if PODs have replicated

[woven basin]

"PODs"?

[fathom aspen]

Literally as it's the case if GameState is valid

[fathom aspen]

ints/doubles/floats (Plain Old Data)

Trivial data types

Which are guaranteed to have replicated by the time BeginPlay is called on spawned from replication actors

That way we have very cool guarantee of "if BeginPlay is called, we are guaranteed to have recieved all our replicated properties (mapped ones actually), along with a valid GameState"

[pallid mesa]

this would avoid having to "wait" for the gamestate in your onreps (as one of the use cases)

[woven basin]

Cant we just override AActor::PostNetInit() and where it says DispatchBeginPlay(); - do a check for Gamestate there?

If Gamestate not yet replicated, create a callback to the Gamestate rep notify to get it to beginplay this actor when it arrives?

so if Gamestate has not arrived, the actor wont start?

[fathom aspen]

That's the problem, PostNetInit is not called on net startup actors, but only ones spawned from replication

[woven basin]

arh...

[fathom aspen]

There is no global callback to when properties have replicated in net startup actors

[pallid mesa]

The goal is to delay the begin play, yup. I havent personally saw the CVAR @supple vapor mentioned above

[woven basin]

IsReadyForReplication seems to only be for ActorComponents. We'd want it on the AActor itself right?

[pallid mesa]

i think the proper route would be for postnetinit to be called also on netstartup

and wait until then to not disptach beginplay on clients

but thats just my opinion, unsure if there are other better approaches

[fathom aspen]

That function has a very cool name, but what it does in action, is far from what its name suggests

And yeah it has something to do with calling say a client RPC on beginplay but it not reaching the client since the owning actor wasn't yet ready for replication

Or at least that's how I interpreted it last time