multiplayer

[shy aspen]

Np, are you familiar with the animation blueprint?

[still cypress]

For the most part, at least the fundamentals in a singleplayer context

[shy aspen]

What about aim offsets? The basic idea is have your animation blueprint read from the base aim rotation since it's already replicated to all relevant clients.

Your base aim rotation would drive your aim offset that updates your players animation to look up/down

[still cypress]

Ah okay, that's much more fancy than what's happening here.
I'm just trying to get a camera component and it's children to replicate their rotation.
That Add Controller Yaw/Pitch Input is just rotating the Camera Component of the character, and there's a few components attached to it

The actor's rotation seems to be replicating, but not the camera component transform and it's children
I do have Component Replicates checked for all player character components

That player character is very simple, but the actual use case with another player character is a VR player. And for that, I have to be able to replicate the transforms of many relative components, like the motion controllers, in addition to the camera for head tracking, and all attachments.

[shy aspen]

The server (if it's a host) looking up / down will be replicated to other clients, but the client control rotation is not sent to the server, it's local to the client. Notice how you're "Adding Controller Yaw / Pitch", that's coming from the Client so it's only happening on the client.

Play as 2 clients and you'll notice that both pitches will be broken.

The aim offset isn't fancy, it's just how this thing is easily done. I'd recommend watching a few videos on how to set it up, it's not hard and might save you a lot of headaches down the road.

Just remember if the video shows them using Get Control Rotation, replace it with Get Base Aim Rotation if you want it to work in a multiplayer environment.

[still cypress]

Unfortunately I don't think aim offset is applicable to VR
https://youtu.be/hkv4zIpXA3c?t=111
I can continue researching component transform replication. Given that Motion Controller Components are components, I would assume there has to be a way to replicate the transform of components and child actors

[latent heart]

Do any VR fps games actually make you place the weapon to your eye to use sights?

[still cypress]

Most?

[latent heart]

Nice

[still cypress]

Seen in that linked video

[shy aspen]

There definitely is, you just can't use the control rotation or camera.

[latent heart]

Not watching random videos.

I wonder if they replicate how hard it is to get a good focus.

You gotta be pretty accurate or it's blurry as hell.

(with scopes)

[still cypress]

Unfortunately current hardware does not. There's depth and proper sight alignment for sure, but the rear and front sight post aren't necessarily blurry like IRL

[still cypress]

Okay, yeah this particular test case is likely the issue itself. A red herring

Ill look into other traditional FPS control methods and their replication

[shy aspen]

There's a good reason control rotation isn't replicated. Your mouse movements would be an enormous amount of useless data being sent to other clients in a multiplayer game.

That was an indirect hint to make sure you don't call an RPC on mouse turn / look 😉

[latent heart]

Heh

[still cypress]

I would of just assumed every tick the server just requests the transforms of any relevant actors and propagates those to the clients.
What exactly and how those rotations changed not being particularly relevant. But I'm obviously a noob with multiplayer. Each attempt has been pretty much a non-starter so far.

[latent heart]

There's no "requesting"

It wouldn't be a problem to send mouse aim data multiple times per second, just not every tick. You can just blend it together to create smooth motion on other clients.

If you wanted that level of replication.

And, of course, the update should be unreliable.

[still cypress]

clients reporting their transform, and the server propagating that to each client, and resolving potential conflicts, that conceptually makes sense to me, but of course that doesn't mean that's how it works. I know that would be terrible in a cheating context, if that matters.

[shy aspen]

It's actually backwards, the server has the authority and tells you where you're position is. That's why you get "server corrections" that snap the client back to the proper position if the client's game instance falls out of sync with the servers.

[hollow eagle]

Even if clients reported their aim rotation every tick (which they shouldn't, but let's assume they do) it wouldn't overwhelm other clients unless you also RPC'd that from the server to other clients instead of using property replication.
Hell, an unreliable client->server RPC every network tick wouldn't even be that bad.

[plucky prawn]

Ye I have a feeling that unless you are still using dial up, you would need a quite a few bad networking practices to ddos your clients

[latent heart]

Depends on the number of clients, though.

Some UE games attempt 100+ simultaneous clients. That adds up.

[prisma snow]

sounds like a challenge

[hollow eagle]

Most games are not doing that, it's not worth talking about until someone actually has that requirement.

That's the point at which you're throwing out most "easy" networking tech and looking at lots of custom workarounds for optimizations.

[latent heart]

True, but I'm just saying you have to consider your circumstances as well.

If you have 4 players max, you're got a lot more leeway than, say, a 32 player game.

[plucky prawn]

Are you guys suggesting that I can't make the next big mmo with out of the box networking in unreal?

[prisma snow]

sorry the truth hurts

[plucky prawn]

Blasphemy

[latent heart]

You totally can.

Depends on what you want from your MMO, though, and how much external tech you want to use.

[quasi tide]

I'm totally unreliable RPCing the direction my client's camera is facing. Because it helps me rotate things easier 😅

😈

[prisma snow]

I unreliable RPC 200 structs each 100ms, who tops that?

[latent heart]

That sounds silly.

[quasi tide]

I slightly modified how the CMC orientate rotate works - uses the player camera. So when a client is supposed to turn around and walk (because movement is based on camera direction when not ADS), it also does it properly on other clients.

[verbal tendon]

No you can totally do it. You can do absolutely anything. Because you are special 🌈

[plucky prawn]

Aw thanks. My mother says I'm special too

[verbal tendon]

🫶

Now dont forget your veggies and go to recruit your fellow future superstars on a forum advertising that you are going to make your first Unreal game, the mega MMO of your dreams!

[junior mauve]

Hi just curious if anyone can point me in the right direction here. So the idea is that I want to save my character data to a persistent save in the game files. I however want it be a 4 person co op so ideally on login it would load the playerstate that I had saved. My problem lies here, I’ve gotten all these systems working in a multiplayer setting but am unsure of where my character information should be. Should I rebuild these systems in the playerstate and have the gamemode access the playerstate and save the variables I want? What is industry best practice for this kinda of situation? I’m new to a lot of this so any input os appreciate.

[fiery quartz]

Hey guys I have a problem with replication on my multiplayer game where I pick up my weapon and it goes to my pickup animation on the server but not the client. I already made the code but I don't have any errors so i have no idea. Thanks

[pure vigil]

If an actor is network culled will it still render?

[fossil spoke]

No, for the Client that its culled it literally does not exist until it comes back into relevancy.

[pure vigil]

Weird, ok. That's what I thought but was surprised to see that with NetCullDistanceSquared = 500; (which means stuff should cull at 22 units away, right?) stuff was still rendering

[fossil spoke]

The effects are delayed, I believe from memory it waits a few seconds before actually culling, just incase the Actor is sitting on the edge of the distance and might frequently be in and out of relevancy.

[pure vigil]

Gotcha, ok that might be what I was seeing - I didn't give it long

Felt like at least 30 seconds..

[fossil spoke]

Cant remember what the time is, 5 seconds maybe

[pure vigil]

Hmm ok, might not be functioning then. But good to know it shouldn't render, makes it easy to test

[fossil spoke]

Well make sure it isnt AlwaysRelevant.

[pure vigil]

I didn't set it to true, could set it to false manually but seems redundant

[fossil spoke]

Also if you are using ReplicationGraph, the NetRelevancy stuff is basically unused.

[pure vigil]

No idea what the ReplicationGraph is 🙂

[fossil spoke]

Fair enough, its Opt-In, so if you dont know what it is then it wont be enabled.

[upper depot]

Does anyone know why my PlayerController class is never set on the server? Is there a special way to set the PlayerController or GameMode for dedicated servers?

[fossil spoke]

You can set the GameMode a number of ways.

Typically its applied directly to the World Settings inside the level.

[upper depot]

Hm yes that's what I've been doing, and it works on the client but not on the server

[fossil spoke]

The Maps & Modes in the Project Settings will also allow you to set a default Gamemode

[hollow bridge]

Is it possible to control 2 characters from a single client? AddMovmentInput for a different character doesn't work no matter what I do (I tried to set net owner). Unless I use RPC and do it from the server or possess the second char

[fossil spoke]

A PlayerController can only possess a single Pawn.

[junior mauve]

Couldn't you technically get the world location of your controlled pawn, offset its location then use that as your input for the pawn youre trying to control, could be used to test things I suppose not in actual practice?

[hollow bridge]

My goal is to control a mount without possess him

[upper depot]

Does a dedicated server even have a PlayerController? Like can I do what's in the pic and have it come back with a real object?

[pure vigil]

ugh. I'm missing something with this network culling. My spawned actors have NetCullDistanceSquared = 10; now, just to really try to force it to work. But the actors stay relevant no matter how far I walk away or how long it's been.

[fossil spoke]

The Server has all connected Players PlayerControllers. That node can return any one of those.

[upper depot]

So with no players connected that would be empty?

[fossil spoke]

Dont try such a low value?

Try something thats equivalent to like 10 meters

[fossil spoke]

correct

on a Dedicated Server

On a Listen Server it should always return the Host.

[edgy patio]

You could have a Pawn that is a Manager and this pawn could redirect the input to every ControlledPawnList

[pure vigil]

Set it to 100, see no difference.

[fossil spoke]

Are you running a Dedicated Server or Listen Server?

[hollow bridge]

It only works if I do it from the server. From client the movement component blocks me even if I'm the owner

[pure vigil]

Dedicated

[fossil spoke]

Did you place the Actor in the Level? Or is it dynamically spawned?

[pure vigil]

Dynamically spawned (by the server)

[fossil spoke]

And you are certain its not AlwaysRelevant?

[pure vigil]

Ya, I even did bAlwaysRelevant = false; just to be 100% sure

Possibly a PIE issue?

that was not the thinking face i wanted

[fossil spoke]

And bNetUseOwnerRelevancy is false as well?

[pure vigil]

Oh, no! I didn't know that was a thing!

Ugh, but no change..

[gray holly]

https://docs.unrealengine.com/4.26/en-US/InteractiveExperiences/Networking/HowTo/DedicatedServers/ "You must be using a source build of Unreal Engine, which you can download from the Epic Games Github" Does this mean I have to build unreal engine from scratch? (using UE5.1 btw)

[fossil spoke]

If you wish to compile out a Dedicated Server executable, yes.

[clear island]

are you 100% sure that the actor was spawned from code and not pre-placed?

[pure vigil]

10000000%

[clear island]

you need to uncheck net load on client if they are pre placed

[pure vigil]

I'm watching them spawn in the level outliner

[clear island]

other things to check

check if tearOff is not set to true

and check if you dont have a reference to that actor somewhere in your code that is always relevant

Like PlayerState, I think that one is always relevant

[pure vigil]

I save no references to the actors and am not currently using always relevant for anything

Not sure what tearOff is, looking into it

[clear island]

getter on the actor: GetTearOff()

should return false

[pure vigil]

tearOff is false

[clear island]

also I'm not sure what happens if you set a really low net cull distance value, I never tried it, does it ever spawn at all? maybe try higher values

[pure vigil]

Ultimately I don't need these actors to be relevant unless the player is nearly on top of them. I can try a larger value

[clear island]

also inside that actor are you spawning other actors? maybe check if those are AlwaysRelevant

[pure vigil]

It is a component attached to my character spawning one actor per second. Spawned actor just has an arrow component and does nothing

[clear island]

and that spawned actor is not spawning other actors?

[pure vigil]

correct

[clear island]

just in case if I would try unchecking "Net load on client"

also when you spawn those actors you are setting Replicates to true right?

[pure vigil]

Put net cull squared at 1000 .. still low I guess. Also turned off net load on client. No changes. Yes

this is incredibly frustrating, it's such a simple setup, I must be missing something.

[clear island]

and you spawning these actors on the server right? not the client

[pure vigil]

Correct

[clear island]

what UE version?

[pure vigil]

One thing I'm trying now is not setting the owner on the spawned actors. 5.1

[clear island]

hmm

[pure vigil]

if I don't set the owner.. I don't see the actors at all....

[clear island]

maybe thats net cull distance already destroying it

because you have a low value

[pure vigil]

ya I think you're right. This is in unreal units, right?

[clear island]

yea

[pure vigil]

also.. ooh

So.. this is a top down game. My camera is far above my player. Is it net culling based on distance to the camera?

[clear island]

hmm I actually dont know that

I'm on 5.0.2 and these past 3 days I've been fighting alot with net cull distance issues, was finally able to fix them all just a few moments ago but I did modify the IsRelevantFor() function

I read this on wizard cell's website https://wizardcell.com/unreal/spectating-system/#4-simulated-proxies-invisible-to-spectator-due-to-net-relevancy

I made the change he suggested there on that last return line

[pure vigil]

Ok so I have no idea why these actors are being flagged as always relevant for the owner, guess it doesn't matter they don't really need an owner anyway. But removing the owner seems to have done it

[clear island]

there is also this

[pure vigil]

Ya, that was false

[abstract pike]

So, using a reliable multicast function, which on the server calls Destroy(), the client gets destroyed before running the code in the multicast. In an effort to fix that I tried calling TearOff before the Destroy call but it doesn't TearOff in time and the client is still destroyed.

Is there any way to guarantee that an RPC will run on a client before it's destroyed on the client?

[clear island]

cant you run this code on the client on the Destoyed event?

[abstract pike]

Does destroyed run when replication stops too or only when explicitly Destroy is called?

I'm trying to use an RPC because while adding replication graph i'm finding client actors are getting destroyed a lot when replication stops due to replication graph rules. I was using EndPlay but it was called all the time on the client even when it wasn't actually destroyed on the server so that's why the RPC.

[clear island]

hmm I haven't used the replication graph myself but I believe the destroyed event will always get called every time an actor is destroyed regardless of it being on the client or server

it will also run the actor goes out of net cull distance since its being destoyed when that happens

not sure how the replication graph does it but I guess its the same

[abstract pike]

Yea then I think that won't work either as I still need certain logic to run only when it's properly killed

[clear island]

well I guess you could send a client rpc before destroying that sets some boolean that will signal the client that next time the destroyed event is called <certain logic must be called>

[abstract pike]

It's the same problem though, how do I guarantee that runs because at the moment the Destroy call is destroying the client actor before it can run. I'm just hoping there is something more reliable than just delaying for 3 seconds to call Destroy.

[clear island]

is this actor that you're destroying just for 1 client or all clients? because if its just 1, the client could reply to that client rpc he received with a server rpc, letting the server know it can now be destroyed

[abstract pike]

All clients

I have thought about the reply and track connections possibility but it seems like there should be an easier way

[clear island]

hmm yea seems tricky

[verbal tendon]

So I havent followed the entire conversation

But it stands to reason that you are doing the wrong thing at the wrong point

simply send an RPC for the real destruction all relevant clients

those clients will execute the logic you currently have OnDestroy

remove the OnDestroy binding

@abstract pike

[tranquil yoke]

But does TearOff removes it from NetDriver? because when NetDriver gets destroyed right now, it removes the actor from the client, i have to stop it from doing that.

[latent heart]

Good question.

I thought when the netdriver was destroyed, it basically changed level. It was all interlinked.

@fossil veldt looked into this a while ago.

Or, rather, the netdriver was destroyed because you disconnected from the server by navigating to a different map.

(which could be the same map)

[tranquil yoke]

I am doing this for beaconNetDriver, so i want to destroy the beaconNetDriver, when Beacon connection is lost, but i want to keep that class available for GameNetDriver of the server Where we started the client Beacon.

when we connect Host beacon and Client beacon, we basically making HostBeacon NetDriver auth of the class, but when we close HostBeacon, the class auth should go back to GameNetDriver.

HostBeacon and ClientBeacon are on Servers, we are trying to connect 2 servers with each other.

[latent heart]

2 servers? Hmm! Good luck.

[tranquil yoke]

yeah, most of the logic working, i can actually replicate Pawns from HostBeacon to clientBeacon, so people can see pawn from one server in another server, and it behaves like normal Pawn.
Issue is removing these pawns and actors from BeaconNetDriver, so it does not get destroyed.
Let me know if you found out how NetDriver is doing cleanup and destroying the actor.

[abstract pike]

I'm not sure if I misunderstood or you misunderstood but I am using an RPC at the moment. That's what the question was about.

How to get either a successful TearOff or Destroy on the Server but also have the calling RPC happen on the clients

[chrome bay]

RPC's will arrive before destroy calls if they are reliable

You can't guarantee they'll arrive before TearOff because TearOff is driven by replicated property

Oh and it goes without saying, but the object has to be relevant to those clients at the time of the call too

[abstract pike]

Oh really? I could have sworn I saw the opposite earlier. To double check, they arrive and are executed before a server Destroy will propagate and destroy the client actors?

[chrome bay]

yeah correct, but only if reliable

It's one good use-case for Reliable Multicasts, if you want to send some parameters to control death etc.

[abstract pike]

Yea I had reliable, or at least I definitely had it at one point but maybe I had something else wrong at the time.

[chrome bay]

The main thing is the actor has to be relevant at the time it's called

[abstract pike]

I see, I can probably force that but will have to think about how that will look with Replication Graph

Thank you

[hushed rain]

Is it possible to have a (blueprint) game with game modes that use listen and/or dedicated servers depending on the mode?

Like Co op uses listen and competitive used dedicated

[chrome bay]

Need to use the source version of the engine to ship a dedicated server so technically not

But what type of server you join to is up to how you set it up

[hushed rain]

Yeah I get i would have to convert it to c++ but yeah so then it would be possible? I didn't know if there was any subsystem stuff or whatever

[twin juniper]

I am implementing Teleportation in a multiplayer context. When using teleportDestination = GetOwner()->GetActorLocation() + GetOwner()->GetActorForwardVector() * 200; everything is working correctly on single player but not working on multiplayer. I am quite sure that I have setup CMC rightly. I am following this video.

https://www.youtube.com/watch?v=SNNH7uJo40A&ab_channel=HarryPearce

youtuber uses some other method to set teleport destination but it is rather cumbersome. Could this be because simple method causes desync?

[fossil veldt]

Correct, UEngine:Browse tears off all actors and then destroys the netdriver

even on an unsuccessful open command, your netdriver is temporarily destroyed

[latent heart]

Is there any other way to end up with it destroyed?

(normally)

[twin juniper]

https://www.youtube.com/watch?v=SNNH7uJo40A&ab_channel=HarryPearce
YouTube
HarryPearce
Teleportation using Custom Movement Component in Unreal Engine
Image
At 18:10 he says to call Cast TeleportRay but there is nothing about this in the whole video. Am I missing something?

[pseudo schooner]

Anyone know why this AnimationBP automatic rule works client to client, server to client, but NOT client to server? I have several of them and everything works fine except these automatic rules. Works fine for everyone except the host

[near granite]

disconnected and connected repeatedly in server with this log when loading streaming sublevel..

Originally creating instance to load the level doesn't work in multiplayer?

[near granite]

Is there any way to set sublevel trasform after automatically sublevel loaded?

[pulsar delta]

Does anyone know how to replicate Media Players? I'm trying to make it play a video on URL but it only shows on the server and to none of the clients, is there something I could try?

[twilit radish]

You can probably just send down an event to the clients to play the same thing. Usually you just send over the state you need, so if all you need is a URL to play something just send over that URL to the clients and make them play it as well. A lot of things aren't replicated within Unreal 🙂

[pulsar delta]

Oh I never thought of that thank you so much! So would I just use multicast instead of sending it to the server first?

[twilit radish]

You still need to go to the server first, a multicast can only be called from the server. But you could use a multicast for example yes.

[fathom aspen]

Not that you can use it in Widgets though

RPCs are meaningless in objects that don't support them

[twilit radish]

Well that too 😛

[pulsar delta]

oh these wont work on widgets? I've been doing them on widget this entire time!

[fathom aspen]

A look at the beginner friendly resources in pinned messages won't hurt @pulsar delta

[twilit radish]

Widgets don't have any networking code. You do it through actors such as the playercontroller, pawns, regular actors etc. etc.

[pulsar delta]

Oh i'm so sorry I just discovered them, they look like very excellent sources thank you so much!

[pulsar delta]

Ahhh god that sucks but I'm so glad I found out now, I'll defiantly have to do more research before posting stuff here haha but it was a bunch of help ❤️

[twilit radish]

I mean it makes a lot of sense once you realise how it all works. Makes a lot of things so much easier in the end, but yeah it can definitely be a bit of "Ok? But why?" moment in the beginning 😛

[worn steppe]

when a variable is set to repnotify, only the server or listenserver can modify the value, right? I mean, a client could modify their local value of that variable, but that is probably a bad idea because it won't be replicated to the other clients or the server, correct?

[pure vigil]

Correct, you can modify it clientside and only that client will have the change. And if the server updates the value, the clientside version will be overwritten

[worn steppe]

ok, thanks. just wanted to confirm I understand this 😄

it's a little overwhelming to learn all of this at once

[tropic falcon]

Out of the box networked chaos vehicles aren't great, what are the most obvious things I can do to make the performance better across a network?

[pure vigil]

If I generate a random number in the constructor of a replicated actor .. the server and all clients will generate their own random numbers right? I can't see why this wouldn't be the case but I need a sanity check

no reason why that number should propagate

[worn steppe]

yeah there is no way that would be synchronized, even with the same seed the client could invoke the rng any number of times between server invocations unless there was a special rng for this purpose alone

but i can't imagine thats the case

especially because, any call that tells clients to invoke their rng for whatever reason, could just as easily pass a randomly generated number along with it

well, unless you are doing large strings of random numbers

yeah, I just double checked, even if you used the same seed, at least the standard C rand() function can produce different outputs on different machines

but, if you really wanted this, you could generate your own entropy data and just package it as part of the game, and then write your own rand(seed) function that works from that block of entropy

[pallid mesa]

they are not that bad honestly, have you looked at how they batch their processing?

[clear island]

them having no client prediction is whats bad 😛

[pure vigil]

Any way to force an OnRep to trigger even if the value hasn't changed? Setting an OnRep bool on the server and I need the client to update the actor based on true/false. But obviously if I set it to 'false'.. it's false by default and the OnRep function never executes. I tried

thinking this might "force" it to update but no luck. I guess the smart thing to do would be to use an enum instead with 3 values but I was hoping to make this work

Reading into the comments on CoreNetTypes.h I don't think the above will work. Gonna use an enum instead

[fossil spoke]

An alternative is to wrap it in a Struct with a uint8 that you increment to force it to replicate again, even if the bool hasnt changed value.

[twin juniper]

do you know why when 2 client are replicated, when the other clients are going too far They disappear, if I go in the range again they reappear. It must something simple /// culling distance or ...

[clear island]

net cull distance

[fierce grove]

it's better when I put it to max net cull but still persists

[clear island]

setting bAlwaysRelevant=true will disable net cull distance but the solution is not to disable or increase the distance, you should take this into account and create your game to handle such cases

alot of relevant actors is going to be heavy

[sinful tree]

Is there a certain reason why you need to have them always relevant? The idea being with net culling is to reduce network traffic by restricting replication of actors if they're too far away from the client.

[fossil spoke]

The PlayerState is an Actor that exists in the World, you dont see it, but they are there. They NEED to be AlwaysRelevant, otherwise they would be subject to the same culling effects and thus be destroyed when out of relevancy range.

The GameState is also in the same boat.

Just a few examples of where bAlwaysRelevant is necessary.

[fierce grove]

could be usefull to have bigger net cull distance let's say for "space" games

[fossil spoke]

We have a large netcull distance for our space ships, however we have other aggressive rules around relevancy for them.

[clear island]

high net cull distance is applicable for sure in some cases, always relevant though not so much imo, apart from playerstate

most of the issues with net cull distance for me has just been distinguishing when an actor was actually destroyed by game logic or by net cull distance, unfortunate that theres no separate client side event for that

[fierce grove]

if you have any doc to share on that that would be cool... I guess compiling from source helps on this

[fossil spoke]

You dont need to compile the engine source.

Using C++ gives you access to a lot more flexible methods for managing Network utilization.

[worn steppe]

Can I pass a simple struct to an RPC?

[fossil spoke]

What do you mean "simple struct" specifically?

[worn steppe]

Just a struct { ... }; with POD members

[fossil spoke]

It must be marked up with USTRUCT

[worn steppe]

kk, ty

[fossil spoke]

Each member must be a UPROP as well

[worn steppe]

oh

ok, also good to know 😄

hmm, thinking on this more, I suppose I don't actually need to pass anything to the server and can just calculate everything there once the RPC is invoked. networking is hard

[quasi tide]

When a client joins the game or gets back into relevancy range, do they get the current server variable values?

[gritty warren]

I am having hella rubberbanding issues with some movement stuff of mine. Anybody have any suggestions/resources on how to tackle this problem? I'm trying to do a slide that dynamically changes speed depending on a slope angle

[crystal crag]

Has anyone here developed any melee games that support multiplayer? I have a couple of questions.

[clear island]

yep

although sometimes, when you have references (replicated uproperties) to other actors/properties inside an existing actor, when that "parent" actor replicates, the references to its child actors may not have replicated yet

[rain wave]

Does Motion Warping not replicate properly? It runs smooth in Standalone but when I try to replicate it the motion is all choppy

[quasi tide]

So - I'm thinkin' about using a save game to store what clothes a character has elected to wear. Then when going from map to map, just load that save game. I figure I can hit two birds in one shot, persisting through game sessions and handling data from map to map. Anyone done something similar? Any flaws someone can see?

[low helm]

not flaws

that's fine

savegame system can be a bit heavy but that's not a big deal

if something changes frequently, you don't want to have to be repeatedly running savegame

but otherwise it's good

[quasi tide]

Oh - it won't be changing frequently. Can only change in the lobby.

[rancid monolith]

I need to make a class to store team data in my multiplayer game mode, stuff like team score, members, objective info, etc. Probably just going to inherit from UObject but I was wondering if maybe there's a more suitable parent class for it

[pallid mesa]

yes, the gamestate

[fleet viper]

I want to profile a single function for it's network stats, since I think it is slow over the network and I want to know which part of the function makes it slow. I heard about unreal network profiler but I from what I understood it's not made for in editor use. Is there any other way to check this?

[kindred widget]

Might need more clarification a function will not run "over the network". It will run on one machine or the other. Which you can use Insights or Frontend to profile. Insights allows you to bracket areas of a function with a macro to break down it's areas.

[thin stratus]

I mean the other case would be that it sends a lot of data very often

Which would qualify for network profiling

The code inside of it could still be cheap

[fleet viper]

It's a shooting function running on the server, inside there is calculated at which location and rotation the bullet should be spawned. I noticed that the response time on the clients with a pktlag of 30 was a bit slower than the server. It just feels a bit unresponsive

[fleet viper]

So best first step would be to decrease the replicated properties of the spawned bullet to reduce network lag?

[thin stratus]

Depends on what we are talking about

A "Fire Weapon" function, at least in the projects I worked on, is mostly empty in terms of properties

By default I never pass anything over. Only when adding some prediction for the Projectile I would pass over some data.

[fleet viper]

This is the code for my shooting function: ```void AFirearm::Shoot_Implementation()
{
if (RoundsInMag > 0 && bChamber == true)
{
GetWorldTimerManager().SetTimer(RPMHandle, this, &AFirearm::ChamberBullet, FireRate, false);
bChamber = false;
SpawnEffectsGlobally();

    ABasePlayer* Player = Cast<ABasePlayer>(GetOwner());

    if (Player)
    {
        FActorSpawnParameters SpawnParams;
        SpawnParams.Instigator = Player;
        SpawnParams.Owner = this;

        FVector Location = Weapon->GetSocketLocation("Muzzle");

        FRotator BaseRotation = UKismetMathLibrary::FindLookAtRotation(Location, Player->LookAtLocation);
        FRotator ImprecisionRotation = FRotator(FMath::FRandRange(GetImprecision() * -1.f, GetImprecision()), FMath::FRandRange(GetImprecision() * -1.f, GetImprecision()), FMath::FRandRange(GetImprecision() * -1.f, GetImprecision()));
        FRotator Rotation = BaseRotation + ImprecisionRotation;

        GetWorld()->SpawnActor<AActor>(ProjectileClass, Location, Rotation, SpawnParams);
        if (IsUsingBarrel())
        {
            UAISense_Hearing::ReportNoiseEvent(this, GetActorLocation(), 1.f, GetInstigator(), Barrel->BarrelProps.GetDefaultObject()->NoiseReportDistSuppressed, "Gunshot");
        }
        else {
            UAISense_Hearing::ReportNoiseEvent(this, GetActorLocation(), 1.f, GetInstigator(), NoiseReportDist, "Gunshot");
        }
        UE_LOG(LogTemp, Warning, TEXT("Bullet Spawned"));

        ABasePlayerController* Controller = Cast<ABasePlayerController>(Player->GetController());
        if (CameraShake && Controller)
        {
            Controller->PlayCameraShake(CameraShake);
        }
    }
}

}

Don't really see why it should behave a bit unresponsive with bad ping especially the logic works all fine and timed but the trigger to shoot time is just a bit slow

[fleet viper]

And this is all executed on the server

[thin stratus]

Not sure what you mean with unresponsive

[fleet viper]

There's a delay after pressing the fire button and the weapon actually firing

[thin stratus]

But that's kinda normal?

You are telling the Server to spawn a Projectile

So you have the half the Round Trip Time to tell teh Server

And then the other half of the RTT for the Projectile to be replicated back to you

Delay is absolutely expected and will be bigger the higher the ping

[fleet viper]

hm thats true

tho other games circumvent this, i guess they make firing etc. client only and then simulate a bullet on client and server seperately?

[twilit radish]

Most shooters don't actually use bullets, what they do is they do a simple line trace / raycast and do some quickly fired particle trails or similar to make it look like it's a bullet and has some kind of trajectory to it. But yes they do predict it on the client side with the exception of actually damaging the enemy.

[fleet viper]

tho the game im thinking of also has bullet drop

which isnt really good to simulate with a linetrace correct?

[twilit radish]

It's a million times easier than physically simulating a bullet, just let your line casts curve down over time 🤷‍♀️

[neon mango]

You can do bullet drops with line trace I think there is a spline trace too

[kindred widget]

All a bullet drop is is a swept component moving each frame with simulation applied for velocity reduction and gravity. You can do the same thing with traces.

[twilit radish]

Also physical bullets sound a pain in general if it's one actor per bullet, all it takes is an automatic weapon that shoots a million times per second to destroy your network with constantly creating, replicating and destroying actors 😅

[fleet viper]

true

[neon mango]

https://youtu.be/yMdQ-W4SiAE

[fleet viper]

ill keep that in mind, our game is 8 man coop against ai so i dont think ill have to worry about it that much

[twilit radish]

I'm not going to tell you how to live your life but I would just not do it with actors, the moment your actor has *maybe* had the chance to replicate to a client it's likely to be already destroyed. Besides it's just a performance overhead for no reason over just using some traces that can just as much simulate bullet drop. But that's just my advice 🙂

Assuming you would replicate them. If not the case the last part is still valid.

[fleet viper]

ill definitely keep it in mind thanks!🙂

[near granite]

I will change the level 7times, I turned on the seamless travel on game mode and set transition map then I don't need to server travel to transition map?

[fleet viper]

ok very different question but I cannot understand this for the love of my life. You might know whats going on here @twilit radish. I play as client. As you can see the AI is standing on the right side and its status is idle. But, you can clearly see from my debug options on the left side (that text is always at the location of the ai) that the ai is standing at a complete different location and its status is overt not idle. How can a location of a character component be out of sync??

maybe something interesting for @thin stratustoo. My understanding of AI in multiplayer is that the character exists on server and client and the controller only on server. So if the controller tells the character where to go it should be visible to all clients.

what

when i use simulate in pie and then reposses and play the ai works, if i play directly without simulating first then it doesnt

[grizzled stirrup]

Is it possible to view the output log from the clients perspective when simulating the client in PIE?

[fleet viper]

like literally the ai location isnt replicated at all. I have changed nothing except simulating pktlag what is this epic

[keen sigil]

hi guys i try to add hit reaction my pvp game anyone knows how can i add

[twilit radish]

What does the server 'see' though? Or are you using a dedicated server?

[twilit radish]

Maybe that it generates an actual log file in the project folder? I remember something vaguely about that. But not sure if you can see it within the editor.

[distant vault]

Hello, I’m having problems with multiplayer connection. I built my game to test the multiplayer experience in 2 separate computers but for some reason, it isn’t working. When I host a game I can’t find it. If anyone knows why this is happening please help and here is the build for the game so you can test it out as well. It’s a Google dive link

Build link: https://drive.google.com/file/d/1h6VKexIawOlhYfjJZlYSLuTxFZvHXO-a/view?usp=drivesdk

[twilit radish]

Could probably use an OnRep for the health I guess? Some more info would be a good idea though 😉

@distant vault I don't think anyone is going to download that for obvious reasons. I would recommend figuring out where the problems occur exactly and if you have any specific questions ask about that. Check for example your log files, debug your code to see where it stops etc.

[fierce grove]

I have a join session success but the client does not "travel" to the map

[twilit radish]

Check your logs, there's a good chance the map path/name just isn't valid.

[fierce grove]

[2023.01.24-13.52.34:573][473]LogOnlineSession: OSS: Join session: traveling to steam.76561198062121577:7777 [2023.01.24-13.52.34:573][473]LogBlueprintUserMessages: [WBP_ServerItem_C_0] SUCESS [2023.01.24-13.52.34:573][473]LogNet: Browse: steam.76561198062121577/Game/Features/Lobby/L_Lobby [2023.01.24-13.52.34:574][473]LogNet: Display: SteamNetDriver_0 bound to port 7777 [2023.01.24-13.52.34:574][473]LogNet: SteamNetConnection_0 setting maximum channels to: 32767 [2023.01.24-13.52.34:574][473]PacketHandlerLog: Loaded PacketHandler component: Engine.EngineHandlerComponentFactory (StatelessConnectHandlerComponent) [2023.01.24-13.52.34:576][473]LogHandshake: Stateless Handshake: NetDriverDefinition 'GameNetDriver' CachedClientID: 1 [2023.01.24-13.52.34:576][473]LogOnline: STEAM: Adding user 76561198062121577:7777 from RegisterConnection [2023.01.24-13.52.34:576][473]LogNet: Game client on port 7777, rate 100000

so it doesnt load the Map it reloads the lobby

[twilit radish]

Is the client already connected to the server when you're changing the map?

[distant vault]

Maybe I forgot to say but when I play test it in the editor with 2 player (client) the connection works

[twilit radish]

If this is on LAN make sure your firewall isn't blocking it, if you're doing this from 2 PCs across different networks make sure the port for the server is open. But again something is likely already telling you in the logs what's wrong. If not the case look at where your code doesn't work any more.

[fierce grove]

no I Create Session and join the map as "listen" for the host. The client joins afterwards

[twilit radish]

How does the client join?

[fierce grove]

find session the join session

[twilit radish]

So the client hosting the server does actually see the correct map? If so make sure you're looking at the server logs too as I think what you're looking at right now is just the client joining.

[fierce grove]

yes the host is on the right map

[fleet viper]

For the server everything is normal, ai moves etc. Everything correct

[fierce grove]

When my friend joins :

[2023.01.24-14.08.51:541][325]LogOnline: STEAM: Adding P2P connection information with user 76561198062121577 (Name: Helmut [0x110000106123269])

[twilit radish]

And there's nothing else? If you're doing this from the editor make sure you don't have warnings/errors disabled.

[fleet viper]

which one of us do you mean?

[twilit radish]

Max.

But for you, is it a pawn or a character that the AI is controlling?

Pawns by default don't replicate movement.

[fleet viper]

Character, replicated is set to true

[twilit radish]

Then that's a really good question why it's out of sync 🤔

It's not accidentally set to dormant or anything in the settings?

[visual otter]

I don't know if this belongs in this channel or #online-subsystems but I'm having the usual problem destroying local sessions on the client when the host quits - should I just stick a DestroySession on begin play inside my menu player controller?

[fleet viper]

whats dormant?

[twilit radish]

It's an option the actor class has for network optimization but it cancels out most networking stuff. Look on your character settings for something with that name. (I would open Unreal for you if I wasn't compiling a source build lol).

[fleet viper]

aight imma look into it

[twilit radish]

That's basically all I can think of on why it wouldn't specifically update the location but still be there.

[fleet viper]

i feel like its a bug because i used network emulation

[twilit radish]

Is it pre-placed in the map?

[fleet viper]

yes

[fleet viper]

oh and fyi if i use simulate first and then posses my char in the level it works perfectly fine for client

tho im not sure if simulating actually also simulates server and client

@twilit radishdormancy is set to awake eg. the default, should i put it to never?

[twilit radish]

Could always try it I guess.

[fleet viper]

nope didnt change anything, i also found out that simulate option of pie doesnt simulate network

[twilit radish]

Simulate network doesn't work in every mode yeah.

Can you try standalone and see if that does work?

[fleet viper]

then even weirder things happen, the gun of the ai isnt even spawned

[distant vault]

thanks ill try it

[fierce grove]

tried in different settings... it's pawn that spawns on player start (no collisions...)

Funny thing, if the server disconnect the client travels to the map

[thin stratus]

Are you spawning or placing your AI Characters?

[fleet viper]

placing

[thin stratus]

are they setup to spawn an AI Controller when placed?

[fleet viper]

yes

[thin stratus]

Hm okay, cause that Enum has caused a lot of headache in the past hehe

[fleet viper]

they do so i know that cuz on the server side the ai is moving and behaving correctly

[fleet viper]

me too xd

[thin stratus]

Do you have the same problem in a new project, for sanity?

Characters controlled by AI should just work^tm

[fleet viper]

im currently downloading an old version of my project(github lifesaver) and ill try there. But ill also try to do it in another project

[near granite]

when loading sublevel, what's the different between function "create instance" and "load stream level"?

[thin stratus]

I think the top one allows having multiple instances and the bottom one is to load a preplaced sub level

There should also be a create node that has a transform Input

[sonic python]

Heyyyy

Guysss

Match Making Is Not Working In Mobile Phones

[fierce grove]

I can't read that console command to join a "session" by steam id

[sonic python]

Like A player mobile A can't play with player in mobile B

[thin stratus]

Something something open steam.1234567890

Not sure about the dot

[thin stratus]

Too vague. What subsystem are you using and what part doesn't work

[sonic python]

Multiplayer

Subsystem?

[near granite]

Oh I got it thank you very much!😍

[fleet viper]

@thin stratusso it doesnt work in an older version of my project too

[sonic python]

The Matchmaking

[thin stratus]

That's too vague. Can they not find each others sessions? Can they not join?

[thin stratus]

Can still be your projects code's fault

[sonic python]

Yes Can't find , Join session

They Create sessions

[fleet viper]

ill go back a lot more and see if it works

[sonic python]

It's Only like this in the mobile

[thin stratus]

Were you ever able to find sessions?

[thin stratus]

Make a fresh project and create a test case

[sonic python]

In Unreal engine , It works

[thin stratus]

No reason to go back that far for now

[fleet viper]

ok

[thin stratus]

Are both phones in the same LAN?

[sonic python]

LAN

I didn't use LAN

[thin stratus]

Then my original question comes back:

What Subsystem are you using?

Cause by default, SubsystemNULL doesn't support anything but LAN or direct IP connection

[thin stratus]

You aren't answering my question

What Subsystem are you using?

[sonic python]

Subsystem?

[thin stratus]

Yeah, OnlineSubsystem

The thing that handles Sessions

[sonic python]

Ohh

Where to find what I'm using?

I guess Google?

[thin stratus]

If you never set anything up then you use NULL

Which doesn't support online sessions

[sonic python]

Ohh

How To Set That?

[thin stratus]

More or less depends on the platform you are on. If you are doing android stuff then probably Google and I have no idea how to set that up tbh

I also don't know if that Subsystem supports Sessions

Not all Subsystems support everything

[fleet viper]

@thin stratusso in the new project it works

but i didnt change anything in my original project and it did work before

[sonic python]

Oh

[thin stratus]

IOnlineSessionPtr FOnlineSubsystemGoogleCommon::GetSessionInterface() const
{
    return nullptr;
}

From what I can see in 5.1 (and thus also prior to that), The Google Subsystem has no Session stuff implemented

So with Google alone you won't get this to work

Your only other option is to use EOS ( #epic-online-services ) and authenticate with Google there.
But I can't help with that, you'll have to ask for help in that channel.

[sonic python]

Ohk Epic Online Services

And @thin stratus

Does Online Subsystem also affect the In App purchases?

[fierce grove]

I have players in the same lobby then the lobby host a game server by open a map with listen argument...everyone knows that a game is created with a specific steam id

Then each clients tries to connect with :

open steam.76561198062121577

76561198062121577.. being the host steam id

client log :

[2023.01.24-15.53.41:011][914]LogNet: UPendingNetGame::SendInitialJoin: Sending hello. [UNetConnection] RemoteAddr: 76561198036395131:7777, Name: SteamSocketsNetConnection_0, Driver: PendingNetDriver SteamSocketsNetDriver_0, IsServer: NO, PC: NULL, Owner: NULL, UniqueId: INVALID

server log:

[2023.01.24-15.53.40:870][668]LogNetVersion: SilentWars 1.0.0.0, NetCL: 23058290, EngineNetVer: 30, GameNetVer: 0 (Checksum: 277290289)
[2023.01.24-15.53.40:870][668]LogHandshake: SendConnectChallenge. Timestamp: 6.264920, Cookie: 043100059122178164208061087156241117109219191073174119246127
[2023.01.24-15.53.40:870][668]LogHandshake: Incoming: Rejecting handshake packet with invalid session id (0 vs 0) or connection id (1 vs 0).
[2023.01.24-15.53.40:887][670]LogHandshake: SendChallengeAck. InCookie: 043100059122178164208061087156241117109219191073174119246127
[2023.01.24-15.53.40:887][670]LogNet: SteamSockets: Connectionless handshake complete
[2023.01.24-15.53.40:901][672]LogHandshake: Incoming: Rejecting game packet with invalid session id (0 vs 0) or connection id (1 vs 0).
[2023.01.24-15.53.41:097][695]LogHandshake: Incoming: Rejecting game packet with invalid session id (0 vs 0) or connection id (1 vs 0).

Basically the client never travel to the host/server map that is set in listen. When the host disconnect the client reload the lobby

[limber gyro]

how are sessions handled when they are empty, are they cleaned automaticly or do u have to clean them somehow? i know u cant make 2 sessions in a row without closing the client

[limber gyro]

are u sure that ID is correct?

are specifing the correct port 2015 when u ping the steam server?

[fierce grove]

the ID is not this one

76561198062121577 < this is the ID

I also tried with open steam.76561198062121577:7777

[rancid monolith]

I'm planning on storing a list of these objects in the game state since I want to support a variable number of teams

thought compartmentalizing the data could be convenient

[limber gyro]

i understood that, how are u getting that ID?

u shouldnt need to use the port when opening a steam server

i have my players connecting through steam so i probably have done what u need

[fierce grove]

I'm making a lobby then broadcasting to everyone that the game has started and people connect using open steam.

I tried with creating sessions / joining and basically the same thing happens

[rancid monolith]

for now I think I'll just do separate lists in the gamestate for each piece of data, indexed by team, and see if that gets annoying to work with. Right now I don't have a whole lot that of things to consider in terms of team-related info

[limber gyro]

so ur server is not a separated.exe? is not compiled?

[fierce grove]

nope

[limber gyro]

if u make a session i think u have to connect through the sessions node, but im not sure on this

[fierce grove]

I tried both standalone and packaged

join session node had the same problem

connecting but not travelling to the map

[limber gyro]

are u messing with the source code or just BP's

ok so the players can connect but they cant travel?

[fierce grove]

yes

[limber gyro]

oh, that i havent done

what are u using for travel?

whats the node

[fierce grove]

On the host

`[OnlineSubsystemSteam]
SteamDevAppId=480
SteamAppId=480
bVACEnabled=True
bEnabled=True
bUseSteamNetworking=True

[OnlineSubsystem]
DefaultPlatformService=Steam

[/Script/OnlineSubsystemUtils.IpNetDriver]
MaxClientRate=1000000000
MaxInternetClientRate=1000000000
InitialConnectTimeout=120.0

[/Script/OnlineSubsystemSteam.SteamNetDriver]
NetConnectionClassName="SteamSockets.SteamSocketsNetConnection"`

[robust oriole]

I have an actor with a (relatively) large amount of subobjects that require replicating. Each subobject just holds 1 variable that updates very infrequently and only one or two at a time. When my client loads into the game theres a noticable delay between PostLogin and when all the Server-Client communication has finished (which i see because my players sprite needs to get initialized on server side). Do you have any advice for how i could improve the performance of my game?

actually i think i might have just found one myself. I have a "grid" actor that holds a number of "tile" subobjects, and those "tiles" keep a record of which actor occupies them. But instead i could just have the grid remember which actor occupies which tiles, which is way less data to save

[limber gyro]

i think u need to use server travel, isnt there a node for that on bp's?

[twilit radish]

@fierce grove you can try the following console command in the editor when running as the host, it seems like something is invalid but I'm not sure what. Can at least try to see if that's the issue:

net.VerifyNetClientID 0

[limber gyro]

also that function, setLobbyGameServer, i have absolutely no idea what it does

[near granite]

How do I get Sequencer to play simultaneously on all clients? Since the clients will be in the same space, the music must be in sync with each other.

[twilit radish]

That's not the issue. The server is actively rejecting the connection, sonicphi. As per their logs they just shared:

[2023.01.24-15.53.41:097][695]LogHandshake: Incoming: Rejecting game packet with invalid session id (0 vs 0) or connection id (1 vs 0).

[limber gyro]

ye i saw that, but he said he can connect he just cant travel

so im assuming hes traveling incorrectly

i dont know about the internals when u open a new map, maybe ids are being reset

also hes doing it on sessions

[twilit radish]

Could for example use this: https://vorixo.github.io/devtricks/non-destructive-synced-net-clock/
To agree on a certain moment to play the sequence I guess.

[near granite]

Thanks!!I'll take a look at it😊

[robust oriole]

if a USTRUCT member is replicated does it replicate all member values of that struct?

[limber gyro]

@eternal pagoda try to print ur session ID everytime you call a function

you will see where it is changing

then u can pinpoint what function is messing ur stuff up

after that check the source if u can

if u cant, try a new function lol

[twilit radish]

The ones marked as a UPROPERTY inside the USTRUCT will yes.

[limber gyro]

maybe that "lobbyData" ur using is being reset somewhere

[robust oriole]

awesome

[quasi tide]

https://forums.unrealengine.com/t/replicating-structs-with-properties/555990 - James answers it here

Goes a bit more in-depth as well

[near granite]

Is there a way to create game state variables at runtime? I want to keep creating a variable with the same name in the gamestate even after server travel

[eternal pagoda]

pinging the wrong max lmao

[near granite]

When the game mode is initialized by server travel, do all the variable lists saved in the game mode disappear?
Or do only the variable values ​​become default and the variable names remain the same?

[twilit radish]

The gamemode doesn’t just delete defined variables. It however doesn’t necessarily persist the data those variables hold after restarting.

[near granite]

Oh,,,I got it ! Thank you~!

[near granite]

game state is also same?🫠

[twilit radish]

In general the game state is different from the game mode, but this in specific is the same yes.

Both do not persist data beyond a restart.

Here's an article about stuff like that: https://wizardcell.com/unreal/persistent-data/

[crystal crag]

If you want to build a multiplayer sword melee game, are you pretty much resigned to switching off the orient rotation to movement?

I was thinking that I wanted to somehow allow the player to aim their sword swing as they were swinging, correcting the feet and spine chain as they turn with the swing

[quasi tide]

You can create a child of the CMC and override the function that handles the logic for that. That's what I did.

[crystal crag]

Was that a reply to me?

I'm guessing so

[quasi tide]

Yeah

Then, all you do is just keep that box checked and bam - you're done.

[crystal crag]

So your CMC and anim BP graph handles letting the player turn around midswing and it looks natural? I'm wondering if the UE 5.1 new motion warping or pose warping (or both) could help me achieve what I am trying to do

Since documentation on custom CMC is scarce. At least I have only seen custom movement modes in C++ for custom CMC, nothing beyond that thus far.

[quasi tide]

anim bp graph shouldn't be involved imo. Also, my game isn't a fighting game, but the concept still applies

[crystal crag]

Right it doesn't have to be a sword swing

anything with the general motions and aiming

[quasi tide]

Animation should just be playing forward, then the CMC rotates for you

[crystal crag]

ah

[fierce grove]

I've tried with 2 plugins / advanced steam session and steam core and I have the same problem... is there something new in ue 5.1?

[crystal crag]

I was thinking about that. Only having a forward and then use something to correct the bones

But how is your custom CMC twisting the bones? Doesn't it just generally manipulate the capsule?

[quasi tide]

I haven't tried any of the new animation stuff networked yet though. So don't know how well that'll work

[quasi tide]

I have no need to twist any bones. The animation does that.

The CMC simply rotates for you

[crystal crag]

I don't get why you need a custom CMC for that then. I must be missing something. The CMC already handles rotating and the player's aim is already replicated

[quasi tide]

You specifically asked about the orientate rotation towards movement option

[crystal crag]

True

Ok, so you leave yours on, which is what I have now. My problem is I want the legs and spine to twist to match the character's aim.

So that's more of the anim bp. Are you using control rig or anything?

Or are you just blending based upon yaw?

[near granite]

Thank you for the good material!

[fierce fiber]

Hello! I have a quick question for any multiplayer experts! Im making a local coop game (spitscreen) and was wondering, if I have a boolean in the thirdperson character called "giveweapon?" But I only wanted to activate the boolean for a specific player, how would I go about doing this, the weapon thing is just an example of what Im trying to do with booleans for different existing thirdperson pawns in the world

[fierce grove]

if someone has a working example of advance session or steamcore working with 5.1 that would be awesome

lost a full day on it

[shy yarrow]

I want to create such a feature for my game that shows the friend's location on the screen with an arrow that shows the players where are the friend's locations, like call of duty zombie black ops,
but I don't know what I must search to find a tutorial. what is this feature name? any one can help?

[near granite]

Server Travel not working (UE5.1)
should i put the whole path of the map to the command console?

[sinful tree]

It looks like you may be appending without a space so the command being processed would be "ServerTravelTryLevel" rather than "ServerTravel TryLevel"

[near granite]

🥲 Thank you

[twilit radish]

Also your logs usually tell you if this stuff is wrong 😉

At least in the editor I guess lol.

[sinful tree]

Offscreen Indicator

[near granite]

I didn't know that I should do🫣

[twilit radish]

The logs are pretty useful with a lot of things 🙂

[near granite]

That's right, I'm glad I come to know that!

I wasn't familiar with Rogue because it looked so difficult🫠 Thank you!

[near granite]

I only let the level load, and when the game state variable changes, I turn on the visible of all clients' levels through tick. but Level visible doesn't turn on...

Is there a problem with just loading the level and setting it on visible later in another line of code?

[pure vigil]

My brain is having a little.. divide by zero moment. If I want to run an RPC function on a single client, is the only way to do that if the client is the owner? Scenario is a player triggering an overlap event on an actor, I want to use SetVisible just for that player

I imagine instead of using SetVisible I could spawn an actor just for that client, making it the owner and have it so it's only replicated to the owner.. just feels a little messy

[twilit radish]

Just send it from within the PlayerController to the client with a reference to the actor.

[pure vigil]

Hmm. So from the Overlap event on the actor get the player controller and tell it to run a function, then from the PC run a multicast function so only the PC's owner will run it. Ya that would work but I hate the idea of having a function on the PC that is specific to this actor

[twilit radish]

You would not run a multicast. You would just run a regular RPC to the client as the client already owns that PC.

Ideally it wouldn't even be a RPC considering it's a state I guess.

[pure vigil]

Sure, sure.

"Ideally it wouldn't even be a RPC considering it's a state I guess." not sure what you mean by this part though

I want my server to be the authority on whether the client overlapped the actor so I don't see how an RPC is unavoidable. Or are you just saying to use a replicated variable instead

Still, my biggest problem with it is having a

UpdateSomethingSpecificForThisActor()

function on my PC..

[twilit radish]

You're changing the state of how that actor is perceived in the world. If your client disconnects and joins again that state isn't the same (or loses relevancy for example) because it was a RPC.

Depends on the use case I suppose though 😛

[pure vigil]

Hmm, that's ..true.. I may have to revisit this problem later when I have more brainpower to focus on a proper solution.

[sonic python]

Hey My Touch Interface Joystick Isn't working

It worked at first but not now

How to fix this?

[tall raft]

Debug

Add some breakpoints and prints

If it worked and it’s not now then you can make it again

Guysssssss, I have a more complicated issue and a bug to report.

In short, in multiplayer if the player is not an owner of any rigibody actor, then this actor physics will never go to sleep locally, for remote players. They will have object jitter around and non trivial performance cost for each physics object on scene.

I’ve confirmed this on 3 different versions of Unreal 4.26,4.27

[gloomy tiger]

This is not a bug.

If a replicated Actor "has no owner", clients will handle physics themselves and get corrected by the server, hence the jitter effect.

[tall raft]

Yes, this also happens if someone else becomes the owner.

Soo this is intended behaviour?

Like what

I can manually handle this, but is it really how it works? Everyone just has to manually put objects to sleep for non owners?

What’s the best solution to fix it?

Why it’s not taking “sleep” thresholds from the object?

[gloomy tiger]

Once you set an Actor's dormancy to sleep on the server, that Actor will no longer replicate stuff about.

If physics are enabled once you put it to sleep, clients will manage it themselves.

[tall raft]

Change dormancy at runtime? I tried all of its settings with no changes.

[gloomy tiger]

What are you trying to accomplish?

Ragdolls?

[tall raft]

Lower the performance cost of apples lying around to grab by vr player and throw around

Simple stuff

Just 200 objects I placed on a big scene

Jitter is unnoticeable in vr but it’s cost for my mobile vr game is too big, it they sleep as they should (on host in p2p) it’s all fine.

I use Smoothsync to replicate movement but this issue is not relevant to the plugin , we tried without it.

[gloomy tiger]

I'm implementing something quite similar; not at that scale, though, and my take on it is broadcasting an event that "apples are lying" and enabling physics/disabling physics on both client and server instances.

[tall raft]

https://media.discordapp.net/attachments/685324470939811910/1067023214678655037/image.png

[gloomy tiger]

It's working pretty well; it's consistent; and I see no performance hits. But again: my scale is not 200.

You're running that on a replicated actor, right?

[tall raft]

This is what I used to mitigate the problem

Yes on all grabbable physics objects

This is nasty workaround and now when I know the cause I can make something better

[gloomy tiger]

Hm.

[tall raft]

You can see this behaviour clearly if you tick physical actor printing if it’s awake

It always is on remote until they became the owners

[gloomy tiger]

When it comes to performant solutions, they usually look "weird" and "non-practical". It sounds counter-intuitive, but if that's solving your problem, go for it with no mistake.

[tall raft]

All object which should be sleeping are not, cost for updating physics and overlaps and everything is obvious.

[gloomy tiger]

One thing you may try

Disable that and let each instance to handle physics themselves.

[tall raft]

I think I tried but sounds good, god bless your memory ;P

Maybe this

[gloomy tiger]

I bet your jitter problem is the server trying to adjust location.

Once that's disabled, the server will no longer intervene.

[tall raft]

Smoothsync also has an option to replicate sleep and ignore small changes, I can set it to any value. And I did with no success

[gloomy tiger]

Although I know SmoothSync, never really used it.

So I can't contribute there.

[tall raft]

I’ve seen it’s code, it’s just basic stuff everyone would do, proper replication done in a proper way.

I’ve asked an author and he also pointed it’s not an issue with Smoothsync directly

And he didn’t know about this problem and personally tried on two versions of unreal

And I can’t really find anything related on the web which is suspicious with this kind of thing

Thx for help, sending love and peace, come up to my place so we can drink a tea if you ever nearby 😉

[gloomy tiger]

Love Poland. ❤️

And I really appreciate your kindness, although I wasn't much of help. Ha!

Cheers from Brazil. 🇧🇷

[obtuse field]

I have a component that holds the web socket connection on the client and need to stay the same when moving between levels. It can't loose connection, nor it should reconnect. What container for it should I use? GameInstance?

[twilit radish]

GameInstance(Subsystem) for example yeah. Also I would highly recommend testing that in a full packaged build. I was just using this my self for something I was making and it crashes my build because of a bug in how it initializes.

[obtuse field]

We love you too

[dawn fog]

Hey guys! Basically i was trying to make a shooting system using the player camera manager but i can't seem to make it work cause of it using the 1 players camera and not being able to kill anyone.So how can i get the ID of The Get Player Camera Manager?

[verbal tendon]

Always explicitly initialize your dependencies when using subsystems

thats what the Collection is for

also dont make too many dependencies between subsystems

😁

[twilit radish]

A pull request for it got merged into Unreal 3 weeks ago, not sure if it’s my fault tbh.

But yeah, I was going to do that tomorrow 😂

[verbal tendon]

😂

[verbal tendon]

Mañana Mañana

[twilit radish]

It’s midnight alright 🥲

Although to be fair the whole way that websocket module worked is pretty weird lol.

Here’s the PR: https://github.com/EpicGames/UnrealEngine/pull/9376

I think I’m just going to merge it into my own source build. Might as well I guess.

[verbal tendon]

Uhm .. what lol

That

is awkward AF

[dawn fog]

Nevermind i just had to replicate it to work

[twilit radish]

I’m pretty sure that pawn or the character has a GetControlRotation or something similar for this. See if you can find that 🙂 Nvm I guess.

[verbal tendon]

That code needs to be burned with 🔥

[dawn fog]

thx but i already got it to work

[twilit radish]

I know right 😂

[dawn fog]

this is all i had to do

BRUH I WASTED LIKE 2 HOURS

hate making multiplayer in ue4 bruh

[twilit radish]

Welcome to game development.

👀

[dawn fog]

i have already been welcomed a year ago but today i wanted to learn multiplayer

and i its painful

dam

[twilit radish]

This is by far not the worst stuff yet though.

[dawn fog]

what's the worst?

in ue4 to do

Making Maps?

[twilit radish]

The character system is up there I would say. Probably prediction for a lot of people too.

[dawn fog]

yeah tbh its hard i tried to make my own took me like 3 days it kinda reminds me of gta v

[twilit radish]

Also I guess bugs that only happen at random with a certain amount of latency lol.

[dawn fog]

yeah bp are very slow

compared to c++

that's why you have to make everything so organised and not too long

or else chaos will appear on your screen

like this

not my code

btw

[gloomy tiger]

My eyes hurt

[dawn fog]

same

[gloomy tiger]

This is blueprints from the streets you know

[dawn fog]

i organise mine like this

[gloomy tiger]

I'd that too if it weren't for BlueprintAssist :/

[dawn fog]

this is my old organised code

from a year ago

pink one is a fuckin mess

[gloomy tiger]

Gash. I remember the times I was full Blueprints lol.

Using Blueprints at that scale now gives me anxiety

You using BlueprintAssist?

[dawn fog]

nope

is like a plugin?

that organises stuff?

[gloomy tiger]

Yes

[dawn fog]

oh

nice

[gloomy tiger]

You press a button and it automatically organises your nodes for you

[dawn fog]

is it free?

[dawn fog]

oh noice

i just press q

and it will make everything in a straight line

but in some cases it doesn't

or just makes it look weird

[gloomy tiger]

Say you have this spaghetti

You press 1 button and...

[dawn fog]

oh

that looks a lot better

[gloomy tiger]

Wait

The straight lines is another plugin

Electronic Nodes

Now, without Electronic nodes 👆

You press one button aaaaaand:

But both are paid :/

[dawn fog]

oh

yeah i saw it

[gloomy tiger]

Although I'd say BlueprintAssist is a must, specially if you're 100% Blueprints. 😢

[dawn fog]

19$

[gloomy tiger]

Electronic Nodes is meh

[dawn fog]

i am

sad face

[gloomy tiger]

Yeah :/ - PS: I'm not affiliated with the developer of BlueprintAssist, it was me #justsaying

[dawn fog]

k

alright thx for the reccomendation

i might get it

if i have enought money left in my card

lol

[prisma snow]

this is why I hate nodes. Even in materials I recently tried writing HLSL and the difference is huge

[twilit radish]

Normally I agree. But burn HLSL 😂

[fossil spoke]

Guys back ontopic please.

[twilit radish]

Sorry 😅

[dark edge]

It's a lot cleaner if you don't ever let anything but execution go from block to block

Stuff like this is gross

[clear island]

anyone know how I could make the t. MaxFPS cmd work only for the client?

testing in the pie, I wanted to test my game when the client has low fps

but when I execute that command on the client, it affects the server too

[latent heart]

Make sure you don't have "run under 1 process" in the PIE settings ticked.

[clear island]

ok yea that was it, thanks

[near granite]

This event binding not working..If i replace it to delay, code works well What am i doing wrong? I need to use the time when loading is finished

[near granite]

I didn't understand fully..but i tried as you mentiond and successed! thank you!😊

[twin juniper]

I've got a casual setup and networking is going relatively smoothly but I was just curious what packet loss level I should be simulating? I've been running at 20% but I've heard that even 5% is considered excessive?

[graceful flame]

Depends on your game and how noticeable packet loss is. I test with both the Average and Bad profiles. 5% is pretty bad for a network but you could probably have spikes of up to 100% at times. In the real world the duration of a "lag spike" is variable and could last anywhere from a few seconds to an all out failure of the network. So how you handle that situation depends on your game. Maybe you have a widget that pops up when packet loss reaches a certain threshold and informs the player of what's going on.

[glass vector]

how do you check if the client or host has the same game version as you when searching or joining a session?

ie, if two players have different game update versions (on android or pc), they can't join each other's games

[warped token]

Hi,

I have a widget blueprint set up to spawn on each player's screen. I'm trying to make it so one player can reserve a certain role and be only client in that role unless they relinquish it. In each playerstate I have an enum that corresponds to the five roles possible. I'm struggling with figuring out how best to store and replicate that enum from the server versions of the PC/PS and GS and get it to the clients. This was as far as I got visually.

I imagine I need to put a "run a server" custom event that calls a multicast somewhere, but I'm just not sure if it goes in the player state, player controller or elsewhere entirely, and how to validate the playerstate's enum against the other player's playerstates is a bit lost on me.

[sinful tree]

Replication only happens one way, from the server -> client. Any variables that you want replicated must be set on the server.
So your OnClicked needs to call a "Run On Server" event, likely best on the player state as that is where you'd want to store your selected ENUM value.

Once you've verified on the server the selection, you can set the enum variable on the playerstate. You can make it a "RepNotify" variable which can then trigger an OnRep function when it replicates to others so you can update any UI, including if other players should be able to select the option or not.

You also do not need a "Replicated Player States" array. There is already an array on the GameState called "Player Array" that is generated automatically client side (and on ther server) whenever a player joins the game.

[glass vector]

are game mode and game state, player state, destroyed when travelling to a new map?

[sinful tree]

https://wizardcell.com/unreal/persistent-data/

[vernal osprey]

Hi, could anybody help figure out what is wrong with this BP? Client-A is the server and updates its Nameplate and Client-B but Client-B only updates its own and not Client-A.

[sinful tree]

Don't use RPCs for something stateful.

You can send a client -> server RPC to transfer the name, as you're doing, but then set that name in the playerstate in an OnRep variable.
The OnRep function should then call an "Update Name" function in your character which takes the name as an input and sets the text like you're doing. To access the player's character from player state, use the Pawn Private variable and cast to your character.

In the character's begin play, you can then also run the function that updates the name - this is mostly for when characters are out of relevancy range and when they come into relevancy the name will be updated with the value from the playerstate.

[vernal osprey]

Perfect, works flawlessly. Very good solution, thanks man

[warped token]

Thank you! This has gotten me most of the way there, there seems to be a few hitches but I think that's an implementation bug on my side more than forgetting a networking feature. The client still seems to have some deference to allow duplication of roles. I'm posting a video and the graphs of the player state, wbp and onrep team role in the player state

[sinful tree]

In here, don't set the enum until you know for certain that no other players have the role. I'd also put this within a function just so you can use some local variables, namely a boolean that you set to true in the loop if you have someone that already has that role. On the completion of the loop, you then check if that boolean is true - if it is then that is not a valid selection as it's already in use. If it's false, then you set the enum on that playerstate. Edit again: No it stands. Set only after you've checked all players. You can still break if you detect just to loop less 🙂

[warped token]

Thank you for providing that fix, I'll be sending an update of that playerstate and function. I also am begining to think I am calling the widgets incorrectly and will run that code by you if that is okay

[sinful tree]

You need to change this. By default the "Can Change Role" should be assumed true.
If a player has the desired role already (team role == desired team role), set the "Can Change Role" to false and break your loop. Don't do anything with the boolean if (team role == desired team role) is false as by default it is already true.

[fierce grove]

Are Steam sessions really broken in 5.1?

[fierce fiber]

Hey guys! I'm trying to create a teleport system for my local multiplayer game. All works well here, other than the fact that it only teleports the second player? Not too sure what I've done wrong as Im still very new to programming multiplayer mechanics into UE5. Many thanks if someone can help!

[kindred widget]

Your issue is likely that you are using a delay. First player overlaps. It runs through everything, hits the delay and stops. Second player runs through, code runs and stops at the delay. When the delay finishes, you're pulling off of the cast node, which will have the last overlapped character and that is all you're teleporting.

[fierce fiber]

I see, should I remove the delay? Just worried that it wont enable the collision of the trigger quick enough to then call the overlap event

[kindred widget]

What is the full intended effect here? Do all players need to be in this area before teleport?

Can each teleport individually?, or are you just trying to teleport everyone when any character overlaps this?

[fierce fiber]

So essentially (because Im still studying the ways of implementing multiplayer mechanics), I have added a huge collision box contained in an actor called "teleport players". On the begin play event, the collision is turned off so that once the players have chosen their roles and pressed the ready up bind, the collision can be enabled again, triggering the overlap event, teleporting both players to a location, which in this case, are 2 spheres contained within the same actor blueprint

[fierce fiber]

Ok I made it work in the end, just had to copy and paste the bp and remove the connection between the teleports to target the designated class

[real ridge]

[/Script/OnlineSubsystemEOS.NetDriverEOS]
bIsUsingP2PSockets=true
P2PConnectionTimeout=80
MaxInternetClientRate=15000
MaxClientRate=20000
NetServerMaxTickRate=60
ConnectionTimeout=20
InitialConnectTimeout=60

[/Script/OnlineSubsystemUtils.IpNetDriver]
ConnectionTimeout=60.0

Guys can I ask? How I can set best values for these things in multiplayer? Also is there any solution how to set how many packets can be lost? during gameplay because my friend tested game with me and he lost 2 packets and his window freeezed during it. Thank you.

[twilit radish]

Packet lost is not something you can control that much, the engine can drop unreliable messages when there's too much network load (I think at least?) but your message can also get lost when send across the internet. You're simply going to have to deal with this scenario, every game has to.

[verbal tendon]

All packets are sent over UDP. UDP is an unreliable network protocol by design

There is network noise, and packet loss is a thing

reliable packets are sent through a special mechanism that emulates TCP (reliable protocol, arrival and order of arrival guaranteed ) properties on top of a UDP connection

[twilit radish]

🙂

[real ridge]

okay thanks so I cant do anything with it

[old sequoia]

Hi!

I'm making a multiplayer game where the client seamlessly travels to a server world.
The client can disconnect and reconnect to the server.

When the client connects issues may arise from internal systems accessing objects / object's variables before they have been replicated from the server and initialized (as you may very well know)

In order to ensure functionality I'm creating a system that serves to monitor certain objects and values and to make sure they have been replicated across the network and initialized before they are accessed by the client.

If I make this system into a GameInstanceSubsystem I know that the subsystem itself exists before objects are replicated, and everything works smoothly. Whenever objects are "ready" they notify the subsystem and the subsystem dispatches the relevant information.
However, when developing the game in editor I usually play with multiple simulated clients in a single process, which causes multiple clients to communicate with the same subsystem.
This causes the concept of "Is the local Player State ready" to become overwritten, for example.

Thus making it a LocalPlayerSubsystem sounds more reasonable.
The issue with a LocalPlayerSubsystem, however, is that I don't know if the LocalPlayerSubsystem is guaranteed to exist before anything else in a multiplayer game?
Is there a guarantee that I can access it as soon as objects start being created / replicated when connected to the server?

If so, what is the correct way to fetch the LocalPlayer?

Thanks!

[sonic python]

Hey Is Google Play Services a Online Subsystem?

If yes then Can it be used for multiplayer matchmaking?

How to add it?

[kindred widget]

A local player subsystem is created directly after the ULocalPlayer. The original ULocalPlayer is done severely early in GameEngine's Init, very shortly after GameInstance creation. So it should be available long before any networking requirements I would think.

[old sequoia]

My research has led me to the same conclusion. Thanks!
My next problem is that I would like this subsystem to exist on the dedicated server as well.. but that's up for discussion with my colleagues.

[kindred widget]

Pretty sure that removes a player subsystem then. Bit odd that you're getting the same subsystem from multiple editor windows though. As far as I was aware, PIE created a separate GameInstance for every PIE instance.

[old sequoia]

There's a slight possibility that I've misinterpreted my results and made the incorrect assumption.
I'll run a proper test and report back

@kindred widget
You are absolutely right. Embarrassingly enough I think I invoked the synchronization event on the dedicated server in my initial test, causing me to misinterpret it as being a shared game instance on the clients. They all seem to have a unique GameInstance.
Thanks again! 😅

[jolly delta]

is anyone with that gif may have an idea why my ai has a laggy behaviour ?

[old sequoia]

It looks like they're snapping to the location received from the Server. CharacterMovementComponent has functionality in place to predict and interpolate / extrapolate movement. Which, if any, movement component are you using for your AI?

[jolly delta]

this one ?

[old sequoia]

Try resetting all settings to defaults under Character Movement (Networking) settings.
Are you playing as Listen Server configuration or Client?
It could be the case that your AI is moving on both the Client machine and Server, causing corrections.
Try playing with the console command p.NetShowCorrections 1 and see if you see any green / red capsules show up. This tells you that the Server is correcting the positions of your AI on the Client machine. You should only move the AI on the Server

[jolly delta]

Are you playing as Listen Server configuration or Client?
we play with a dedicated server, so all clients are only clients, so server only has authority on the controller. Controller is only created on server right ? controller is not supposed to be replicated (?)

Try resetting all settings to defaults under Character Movement (Networking) settings.
where ?

p.NetShowCorrections 1 > on client console ?

p.NetShowCorrections 1
nothing is showed so there is something wrong i guess

[old sequoia]

All controllers are created on the Server, but each Client has its own local Controller.
They're not replicated but are created in a way that they gain elevated network authority (the Client can send RPCs to the Server directly through it, etc)
The Controller is separate from the pawn the controller moves.
You should make sure that only the Server moves the AI pawns.

You reset the settings in the component settings when you click your Character Movement Component in the Blueprint editor

Yes, enter the command on the Client console.

[jolly delta]

so that should be what we do for spawning on server side right ?

[jolly delta]

everything is setup by default

[graceful flame]

What happens if you remove the delay?

Event possess > Ai move to

[sonic python]

Guys

Is A Online Subsystems Definitely Needed for a multiplayer game?

Create,Join , Find Session?

[winged badger]

in theory no, in practice very much so

[sonic python]

In practice?

Does It Mean like for players , to start a match

[winged badger]

you could get by playing on LAN with your friends without a session system

but not much else

[sonic python]

A Online Subsystem has to be used?

[jolly delta]

my player is not spawned when the ai is possesed so it just do nothing

[winged badger]

has to no, but it should

[sonic python]

Oh

[sonic python]

A Online Subsystem has to be used?

[winged badger]

its just simpler that way

[sonic python]

Like

[winged badger]

you do get to pay the entry cost first time around though

[sonic python]

For Games Like Fortnite , Pubg ?

[graceful flame]

But those are two separate things

[sonic python]

Start a match, a online subsytem helps to create sessions?

[jolly delta]

but when i remove it it just do nothing

[winged badger]

all released games use online subsystems nowdays, in one form or another

subsystems as such are relatively new, but the implementation isn't much different

[sonic python]

Is it like necessary for these?

[sonic python]

What Subsystem would you received for use in mobile ( Google play store)?

[graceful flame]

The delay is causing the laggy AI movement, so you need to know when the player pawn is already right? You could dispatch an event and when it’s called you can spawn your AI.

[winged badger]

i'd probably go with EOS, but i don't do mobile, see #online-subsystems and #epic-online-services

[sonic python]

Ok but it's more easy to use Lan right?

[jolly delta]

but this node will not follow the player if it start moving ?

[graceful flame]

Plus the AI controller isn’t auto possessing

But now this seems more like an #gameplay-ai conversation

[sonic python]

just ticking these should be enough to use lan right?

Zlo?

[vestal bobcat]

Does OnNetCleanup gets called if we experience a crash so to do some cleanup in a pawn ?

[gloomy tiger]

OnNetCleanup runs whenever the connection is killed.

If the crash breaks up the connection, then yes.

[vestal bobcat]

ok cool thanks

[hybrid crown]

Hello,

I would like (c++) push the player in XYZ direction when he receive a bullet,
I perfectly see how to avoid server correction with the CMC for jumping, but i don't get the process when the player is not aware of the velocity change in first.

Any help, video, or ressource on this ?

[chrome bay]

To some extent you have no choice but to live with corrections. Client is forward-predicting, but bullets will be behind. Best bet is to apply on both server and owning client, and hope the correction goes largely unnoticed.

[hybrid crown]

Hum and if i turn off prediction when he receive bullet, and reconciliate after a grace a time ?

correction*

or it would be better to juste increase net distance correction ?

[chrome bay]

Won't work. Bullets are behind by clients ping, by the time they know the bullet has hit them it's already too late, server will have corrected (or at least, move will have been sent to the server)

The two things are happening in different frames of reference.

[twilit radish]

There's also no point in having a grace period because then the client will just override the action.

[hybrid crown]

I see.

[chrome bay]

Exactly. Queue a "no bullet stopping power" hack

[hybrid crown]

wdym ?

(and increase distance correction for the whole character and hope will not do the trick ?)

[chrome bay]

Correction distance won't help, it'll just result in larger errors and clients will be in the wrong place

[twilit radish]

As in that the client cheats by saying it never received the update and just abuses the 'grace period' it has.

Is what I assumed Jambax meant.

[hybrid crown]

So, there is 0 way to do it at least less noticeable for the client ?

[twilit radish]

Again. There's no point in setting the correction distance higher, if the server applies the velocity and the client does not the client will override your velocity change because it now has more distance for not getting corrected.

[hybrid crown]

got it.

[chrome bay]

Hopefully the built in smoothing will make the correction less noticeable

The client could "forward predict" bullets that are near it by their ping factor, to try and predict stopping power, but it's still gonna be flaky

[quasi tide]

Just don't make PvP games and let players do w/e they want. Networking on easy mode 🧠

[chrome bay]

Might result in more misspredictions tbh

[twilit radish]

Introducing Minecraft where both scenarios are true. Cheaters? We don't care about it. PvP? Heck yes! 🤣

[chrome bay]

Gears of War had stopping power and there's nothing explicit for it in the codebase, so guessing this is what Epic did tbh

They also used hitscan though, made life a tad easier

Less time for things to go wrong or diverge

[twilit radish]

I don't see how on earth you want to predict a bullet though. At least if we're talking with other clients shooting them. You can't possibly predict a different client shooting 😛

[quasi tide]

In my co-op game, I do hitscan with the client and the client tells the server, "Hey I hit this", server does an ultra simple linetrace itself, and if it was possible, just agrees.

[jolly delta]

is anyone can tell me the right procedure to spawn an AI ?
like i do :
spawn on gamemode
ai controller : on possess -> do action

ACharacter is replicated and mouvement too

[quasi tide]

Doesn't have to be in the game mode

But all you do is, while on the server, spawn an actor like normal

Set your AI pawn class to auto possess when spawned or placed in the map and that's about it

Make sure it is also using the correct AI controller though

[hybrid crown]

it's what i do too, except bullet have flying time.

but same idea.

Ooooh, i've maybe have idea, a bit cluncky but

Player receive the bullet -> Client apply the force, then send to the server who apply also the force.

not cheat proof, but should be seamless

[twilit radish]

It will look delayed on the server as well though, but that's kind of your only option if you really want this I guess.

[chrome bay]

Yeah it's chaos. I tried forward-predicting projectiles and it became a real minefield

Predicting your own.. not so bad. Predicting other player projectiles? Noooo chance

[twilit radish]

That's why I still don't understand how Rocket League works lol. How do they predict the ball when other clients are touching it? xD

[hybrid crown]

yeah, i guess i can just play with some offset with the mesh itself and try to predict, smooth the the result for proxy

and will not look so clunckly hopefully.

until someone have 200ms.

"go play on your own server f************"

[quasi tide]

Well, the answer is quite simple actually. They're better than us.

And also spent like 2 or 3 years on this specific thing.

I recall them talking about how they were working on it for so dang long.

[twilit radish]

But still, conceptually I don't see how you want to predict a ball on the client while a moving other player can change the trajectory to anything at any time. I see how that works when you're the one playing but I don't see how that works with others lol. Although I know RL is far from perfect, but as far as I can tell it does not constantly set back the ball when someone else is doing things with it.

The one mystery that I'm really curious about haha.

[graceful flame]

Exactly! Cheaters have ruined PVP for far too long. I guess it's time to make a player vs player puzzle and maths game instead and watch as the $$$ pile up. Something similar to the all time classic Treasure MathStorm! https://www.youtube.com/watch?v=JzWfspUYWnU

[fleet viper]

@thin stratus and @twilit radishIm the guy with the weird ai replication bug from yesterday, I finally found the culprit. I replicated a bool on my character cpp class and that made the ai's replication glitch out. I still dont understand why, since members should be able to replicate on an AI's character class. Now to my question since this is prob an engine bug(I did everything like in my normal player char class to replicate props) is it worth opening a bug ticket? Never reported an engine bug, thats why.

[twilit radish]

How did you define that stuff?

It seems really unlikely to me that it's an engine bug honestly. Trust me, been there many times 😂

[verbal tendon]

Nobody can help you better answer that question unless you post some code

Given the amount of uncertainty in your messages it is highly likely to be user error, rather than an engine problem. Of course, nothing is ever guaranteed in life, that is just an educated guess

If you post the exact context, code etc... comparison of what worked vs what didnt. Someone can help you make that determination better

[fleet viper]

made a normal declaration of bool Dead = false; with upropertys(replicated). In cpp i then added it to the replicate function void AMetaAI::GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const { DOREPLIFETIME(AMetaAI, Dead); } I also added the Unrealnet include in the cpp file. Replication is enabled as default if im correct.

thats my setup

@twilit radish

[twilit radish]

And there's your issue.

You're not calling the super so it won't do any of the replication properly for the rest 😛

[fleet viper]

oh

right

that explains everything

[twilit radish]

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

    DOREPLIFETIME(AMetaAI, Dead);
}
```:D

[fleet viper]

i swear this happens too often to count

[twilit radish]

I do it all the time too with random stuff 🤣

[fleet viper]

thanks a lot for the help!

[verbal tendon]

And there we go, that is why it is easiest to give as much context as possible, including code snippets

I had to take a phone call and by the time I got back to reading someone spotted the issue 🙂

Always call super. This includes making nodes to call parent function in BP

I have lost count of how often I have needed to drill this into people...

😂

[fleet viper]

yeah, weirdly it always happens to me when i declare the lifetime replciated props function

[naive wyvern]

Hey there, I hope it's okay for me to double post from a different channel, didn't realize there was a multiplayer one. I've been trying to work with the CharacterMovementComponent to create a Teleport, but it seems like the teleport works when I run the project in the "Standalone" play mode, but if I play as the client, the player gets rubberbanded back to their original position due to server reconciliation

would be happy to post code, but I'm not 100% on where this issue might be coming from

[twilit radish]

Would definitely be a good idea to show how you did it yeah. Generally I would assume the issue being that the client teleports but then the server doesn't and then the server corrects the client, at least is what it sounds like so far 😛

[naive wyvern]

I'm almost certain that that's what's happening, because I can see the client teleport to the expected position for like, a frame.

I'm honestly also still learning how the CharacterMovementComponent works, so I was having trouble finding what functions handle the corrections from the server

this is the function that physically teleports the player as a start:

void UShooterCharacterMovement::ProcessTeleport()
{
    FHitResult res;

    UE_LOG(LogTemp, Warning, TEXT("processing teleport %s"), *(teleportDestination).ToString());

    SafeMoveUpdatedComponent(teleportDestination - GetOwner()->GetActorLocation(), GetOwner()->GetActorRotation(), false, res, ETeleportType::TeleportPhysics);

    execSetTeleport(false, FVector::ZeroVector);
}

[rose egret]

@fleet viper AI actors exist only on server they are not replicated

[fleet viper]

Ai controllers only exist on the server, ai characters have to exist on server and client. Otherwise the client wouldn't be able to see the ai

[rose egret]

by AI character you mean ACharacter derived classes ?

[honest rain]

hello !
I am trying some things on multiplayer these days, and I am in the context of a dedicated server that would be supposed to run for days.
Players can alter the world ( ie actors that are part of the map ), and to be able to replicate those changes each time a player connects, I am basicly destroying all the actors and re spawning them client side from what the server has been saving on its side.
It works great, but I am afraid that the more the server 'lives' and register changes, the bigger the loading client side will be since it basicly adds up more and more...
Would you have any suggestions on how to optimise this ? I was thinking maybe saving the map with all actors 'as it is' as a new map server side, and just send the map to all players connecting afterwards, but not sure on this one...

[twilit radish]

If we're talking just a couple tens of actors every so often just set the distance on when they become relevant to something appropriate so that not all actors constantly replicate towards the clients but only when they are near them.

[honest rain]

ooh I see, it would be kind of making a chunk replication system right ?
Although here I am more talking about hundreds, if not thousands of actors... making this 'chunk' process even more needed

[oak oracle]

Hi devs , got a quick noob question, if i spawn a replicated actor the server , since its is replicated it will be automatically spawned on the clients as well right?or i am messing up something?

[quasi tide]

Allegedly, yes.

[edgy patio]

Same if you destroy it from the server

[real ridge]

guys is this good way of setting players name in multiplayer game or not?

[twilit radish]

Why would you call a RPC if it's already a replicated variable? Just use an OnRep. (Which is also better than a RPC IMO in this case).

[honest rain]

you mean using a RepNotify ?

[twilit radish]

Yeah.

[real ridge]

when I have this variable set as replicated then in game its not replicated

but I can try repnotify

but I remember it did not work too

yea RPC does not work

he should has name test

so i used this

[honest rain]

I think instead of setting the name from the server to the player

you should try asking for the name from the server, using your character controller

the widget you are using probably ( ? ) only lives on your owning player, and the server can't access it

just a guess though

[real ridge]

i am using player pawn widget

uh

[real ridge]

I used repnotify here but same effect I dont see enemy name 😦

[real ridge]

idk why I see my own name but name of enemy is not replicated even it's in repnotify

should I rpc rep notify?

[edgy patio]

Looks like you are setting the nickname on the client without a Server RPC

The replication works from Server to Client.

You change the value in the Server (if from Client than you should make a Server RPC)
The Server will change the value and replicate to clients

[deep coral]

Does point damage also trigger 'Event Any Damage' ?

[silk nexus]

Good evening all. I have this intuition that I'm missing something very fundamental on my collision-based RPC. The listen server does not activate the On Component Hit event when a client hits the actor's collision mesh (sphere). I am using the default pawns in the map.

When the listen server pawn hits it, it properly triggers the multicast. When a client hits it, the client instance triggers the event as well.

Perhaps I'm fundamentally misunderstanding how this is supposed to work. Do you see what I'm doing wrong?

[woven basin]

You should be doing all the collision stuff on the server, and just replicate the results to clients.

So even the client pawn, that pawn still lives on the server. The server handles it and let’s the client know.

[silk nexus]

That's what I'm trying to do

Hence why I say my intuition is that I'm doing something fundamentally wrong here

I'm monitoring the instance of the server object

Is there some document I can read? I've pored over the guides in the official documentation and read a search here for "client collision" but something is not clicking

[real ridge]

should not rep notify automatically be replicated on clients and server too?

[edgy patio]

rep notify = a notification that a replication happened.
The replication system happens from Server to Client.

So in your example the Client has the Name. He first need to make a Server RPC so this data can be send from Client to Server.
The Server receives the RPC and update the Name. Since this is marked to replicate, the Server will replicate this data to all relevant clients. Since this replication has a notify the OnRep_NickName triggers.

[real ridge]

sure hmm

also look this is how I had it before and it didn't work too

this is rpc

[edgy patio]

You are not sending any data to the Server in this RPC

The Client Set the NickName then make a Server RPC that directly make a Multicast RPC

The Server need that NickName data.

UE use Server Authoritative model. The replication is just one way, from Server to Client.
If your Client Set the NickName there is no replication.

The Client has the NickName value.
He sends this data to the Server using Server RPC.

The Server set this data value and since this variable it will be replicated to all clients

I suggest taking a look at this https://cedric-neukirchen.net/Downloads/Compendium/UE4_Network_Compendium_by_Cedric_eXi_Neukirchen.pdf

[near granite]

If I get player 0 pawn from the level blueprint, is it player 0 on the server or player 0 locally?

[thin stratus]

Both

[sweet ore]

do i need to set has auth to begin play on repnotify?
because when i set has auth it is not setting the name

[sweet ore]

i mean with not setting when player join relevant distance again it is setting name to nothing with has auth but working fine without has auth

[upbeat basin]

Are you setting something to itself?

[thin stratus]

Not sure why doing that either

[sweet ore]

this is what i did so far

[upbeat basin]

Do you call SetName from somewhere?

[thin stratus]

Why a Multicast when you have an OnRep....

[sweet ore]

yes an actor just set random name

[upbeat basin]

I think you might want to check the above discussion which seems similar to your issue what you want to achieve

[sweet ore]

so i dont need the has auth in begin play? in secure cases

[upbeat basin]

Using HasAuth in BeginPlay would help you to split your logic between clients and server

Which doesn't seem like required here

[thin stratus]

Why do you need BeginPlay anyway

The Actors isn't despawning on the server

[sweet ore]

to set the name again in relevant

[thin stratus]

The value is still the same on the server

When they get back into relevance it should just call the OnRep

There is also no reason to multicast

[sweet ore]

but it is not calling it in my case

[thin stratus]

Then just do the thing you do in the OnRep additionally on BeginPlay

For Clients at least

They probably get respawned with the correct value

[upbeat basin]

Is the issue happening only when you get out of relevancy?

[sweet ore]

yes

[sweet ore]

it is working without multicast thanks

[hexed pewter]

When creating AI for a multiplayer, it should be controlled exclusively by the server logic and only replicated on clients right?

[real ridge]

it's weird mine repnotify was not working without multicast

idk what I did wrong but it was like this and names were not replicated

[kindred widget]

As with anything, it depends. In a normal scenario, sure. You don't normally want NPCs to be affected by clients outside of gameplay stuff. On the other hand there are small cases where you might want a client only ai pawn. Or maybe cases where each client might simulate AI on their own for visual effects. Like just flavor ai citizens in a multiplayer city builder.

[sweet ore]

you have the code up there if you want to try it in side project to make sure

[sweet ore]

.

and this is the last step the variable string in widget text (replicated)

[real ridge]

i do not have binded my text I am just setting up text by set text maybe that's the problem

when it's not binded it's not replicated

[real ridge]

can you show me bind function please?

[sweet ore]

setting the name (widget) and get the name repnotify to set the name in widget 👍🏻

[real ridge]

this is how my repnotify looks and then my widget bind to name and name but its showing nothing above enemy plane... 😄

weird

[winged badger]

simplify your life

player state already replicates the name, and it will by default pull it from whatever service you use to play (steam name if you play over steam)

[chrome bay]

also replicated FText = bad

[winged badger]

put your widget component on the PlayerState

and attach it on its PlayerPawn

that way your replication goes through only one, not two actor channels

makes it way simpler

[real ridge]

I have name stored in my game instance as player state is not persistent when you join the session