multiplayer

[sinful tree]

Those are the things that are concerns about running a dedicated server system on a phone.

[sly kernel]

WiFi is not mediocre - PC VR can be streamed over wifi to standalone HMD.. It's more than capable for multiplayer coop purposes, especially on LAN.

true, but that's on them

[sinful tree]

Right, but then it's on you to end up supporting them when they come back to you and complain about why they can't host properly.

[sly kernel]

could post a big letters warning on the splash screen when they start app on their phone 😛

they can also have their phone plugged in or run off battery pack

[sinful tree]

Likely ideally, yea, we'd all have wireless gigabit speeds with 1ms latency, but majority of people aren't near that yet :/

[sly kernel]

in the markets where Quest 2+ HMDs are sold, people have minimum 5Ghz WiFi

[dark edge]

Why not just have one of the quests host?

[sly kernel]

because the game is already inching to CPU limits.

can't have any frame dips in VR

so, so far it sounds like a bad idea from different perspectives :/

[dark edge]

There isn't that much of a CPU budget difference between listen server and standalone

[sly kernel]

hosting on the phone that is

[dark edge]

Depends on the game of course. But I wouldn't expect there to be much of a difference at all

What the hell are you doing that's eating all the CPU anyway?

[sly kernel]

no, I am saying that there is no room to run listen server on one of the HMDs. It barely has enough juice to process the world. Processing extra stuff would be problematic.

[sly kernel]

particles, physics, AI

[dark edge]

There isn't much extra.

Unless you're doing some sort of open world thing where all the players are not relevant to each other.

[sly kernel]

perhaps maybe it's just an overkill for standalone VR 😛

[wanton bear]

where is the best place to store widget stuff like creation and multicasts for chat in multiplayer blueprints

or best practice or most common place

storing stuff in player controller is a bit awkward

[thin stratus]

Widgets in the PlayerController or even LocalPlayer are pretty fine

Depends a bit on the Widget

If you want to send a Chat Message via Multicast, you Multicast that through the GameState and then locally access the Widget through the PlayerController

[wanton bear]

is there a reason to have the logic split between player controller and game state or player state though

im definitely overthinking this but it's bugging me that people don't seem to have a best practice

i mean as opposed to having it all in game state or player state

hmm okay, that kind of makes sense i guess

[shell leaf]

When I press play the jump animation starts immediately even though I am checking a bool (isFalling) to transition to the jump state. After doing some experimenting, it turns out that this only happens on Server version of the game. isFalling() is true for ONLY the first tick on the server's character and not true at all for the clients. Anyone got any ideas?

[dark edge]

The player controller should handle stuff pertinent only to the human player and not the game state at all

[serene kestrel]

When spawning characters, they're usually spawned just slightly above the ground, so on the Server the character is likely in the air (aka falling) for a frame or two. You may want your jump transition in the state machine to look at the actual jump boolean otherwise just walking off a ledge could trigger your jump animation as well

[shell leaf]

This makes a lot of sense! Thank you very much for the response 🙂

[hollow brook]

Greetings! I have a question regarding multiplayer/prediction/server authority. I understand the system where the server is the one deciding whether a client action is permitted and can authorize it or cancel it. This is mostly done to prevent cheating. My question is, how much different would be implementing Multiplayer without this Server Authority system? For example, a simple COOP game where one would not care about player cheating etc. Just that everything is replicated correctly. Do you have any informations or resources on this topic? Thanks!

[serene kestrel]

Even in a co-op game, if you're going to be connecting multiple versions of the simulation in a multiplayer scenario, you still need to decide what is the the "true" state for each of your Actors/Objects in the game. In a "server-authoritative" model this is decided by whichever computer is the server. What you're describing is maybe a "client-authoritative" architecture. The problem you run into with this is deciding which Actors/Objects are owned by which clients. Once that's decided, you also need to get that information to all other clients. Unreal by default only allows sending information between Clients using the Server as an intermediary

Overall I would recommend still having a "server" in your setup which can be one of the clients. You can set certain systems (such as movement) to be "client-authoritative" meaning the server just trusts that client about what it says the state is.

[quasi tide]

And you can always just have the server process w/e the client says they did.

Instead of working against UE's design

[hollow brook]

So if I understand correctly, I could use more functionality to be "client-authorative" as I do not need to check everything the client does is correct, but I do need to check a few things to keep the game synchronized (for example, if two players would pull an item from a chest, if that would be fully client-authorative, it could result to item duplication).

[serene kestrel]

Correct, if you only want one player to be able to pull the item, someone eventually has to decide who actually got the item and the other players' clients need to sync up to that data

[dark edge]

That's how I wrecked entire Minecraft servers back in the day when survival multiplayer just released.

I found one gunpowder in a mine shaft chest and duped it into entire inventories full of TNT and terrorized the place.

[frank birch]

@pallid mesa why did you make your sync clock inside the PlayerController? 🤔
https://vorixo.github.io/devtricks/non-destructive-synced-net-clock/
Say, in the GameState? Is there a deeper reason or just personal preference? 🤔

I am not the first one then 😅

Well, I also have a question of why does it use the shortest round trip 🤔

this assumes time doesn't drift 🤔

or I could keep using a diff from a low moment in the past and drift further and further away 🤔

I sinc with the lowest lag, if I get laggier as I drift (and if I drift back then I will be laggier) then my adjustment will get stuck in the past version 🤔

[pallid mesa]

becuase the player controller is client owned and it can throw server rpcs as well as receiving client rpcs

[serene kestrel]

How much clock drift are you realistically looking to combat against here? You should take enough samples such that network jitter isn't affecting the measurements. Though as with any clock sync algorithm, your times will have some half RTT bias that can't be avoided but I'm not sure if that's what you're referring to

[pallid mesa]

its... yeah... i mean if you think about it, even the most accurate one with high hazardous conditions kinda performed super well

and the approach is based of statistics

its not... purely mathematic per se

[frank birch]

Oh, for sure

My only question was about the PC

[pallid mesa]

sorted it out for ya?

[frank birch]

I just asked the other one because Laura teased me 😅

[pallid mesa]

hehehe

[frank birch]

I think the rolling window approach cost is not that big

And it's waaaay more accurate

[pallid mesa]

yeah nah its good

@serene kestrel for context, in the blog I expose different clocks, some better than others exploring different techniques

[hoary spear]

When you do an OnRep which includes the old value, how would one include that if you call the OnRep manually?

Is there some fancy magic for it ?

[pallid mesa]

by.. hand

XD

[hoary spear]

So you'd temporary store the old data, and pass it in ?

sounds so backwards, thats all x)

[pallid mesa]

haha ye

[frank birch]

The fancy magic is the DOREPLIFETIME macro

If you call manually, you remember the old value manually

[hoary spear]

Alright, ty for confirming

i was sorta afraid of this x)

[frank birch]

(saw it just today while learning gas)

[serene kestrel]

The circular buffer is mixing an averaged RTT with specific event measured timestamps, that calculated Delta doesn't make sense to me, what if the latest arrived timestamp was quite delayed, using the best RTT's leads to a large Delta

[pallid mesa]

statistical outliers are removed as part of the algorithm

[serene kestrel]

in ClientUpdateWOrldTime_Implementation I just see it setting ServerWorldTimeDelta directly, where does the outlier timestamps get filtered?

[pallid mesa]

if (RTTCircularBuffer.Num() == 10)
{
    TArray<float> tmp = RTTCircularBuffer;
    tmp.Sort();
    for (int i = 1; i < 9; ++i)
    {
        AdjustedRTT += tmp[i];
    }
    AdjustedRTT /= 8;
    RTTCircularBuffer.RemoveAt(0);
}

there

tmp.Sort();

[serene kestrel]

yea but then ServerWorldTimeDelta = ServerTimestamp - ClientTimestamp - AdjustedRTT / 2.0f just uses the outliers anyway? Or maybe I'm misunderstanding what that value is used for

[pallid mesa]

AdjustedRTT doesnt include the outliers, no

unless theres a bug hehe

it might be very possible

[serene kestrel]

sure, but ServerTimestamp and delta between ClientTimestamp and GetWorld()->GetTimeSeconds() could be an outlier

[pallid mesa]

the current RTT you say? it gets added to the array per sample

this function will be called at a fixed interval

moving the sliding window to query the latest RTT

[serene kestrel]

In that final assignment, you do ServerTimestamp - ClientTimestamp which could be an outlier if there was high network jitter on this collected sample

[pallid mesa]

yep

thats expected, in the next update this drift will go away

[serene kestrel]

If you discard this sample in the loop, you probably don't want to update your delta

[pallid mesa]

maybe!

in fact....

this might file for an upgrade in the clock!

however before doing anything /// i need to run it in the same experimental setup

i dont expect much improvement, but theoretically speaking you are right

[frank birch]

If you rerun the tests, allow the rolling window to warm up (I assume you did, but just in case 😛 )

Also, how do you test? 🤔

If you simulate lag... How do you unsimulate it? 😅

[serene kestrel]

If you really want an averaged sample delta, you should probably store the the calculated deltas and sort them by the RTT. Then average the calculated delta's of each of them and use that as your clock delta

[pallid mesa]

ouf thats worth another blog post XD but basically the tests are all performed with emulated latency inside the editor. So it is possible to access the server clock from a client instance due to the nature of the simulation.

[frank birch]

Crawling through the editor? Interesting 🤔

Other alternative would be local isostamped logs

Less convoluted, and since both run on the same computer, the isodate should match

[pallid mesa]

ye

[frank birch]

I'm not at home, when I get back I will do some testing 😅

[pallid mesa]

If you really want an averaged sample delta...
worth exploring aswell

[umbral gale]

Hello guys,
I started a new multiplayer (4 players) project and I just launch the basic Third person project provided by Unreal, I tested Network Emulation with average settings ~60ms lag and 1% packet loose but the game is really laggy for all clients (3 Clients + one is a listen server), do you know why the game seems to be laggy ?

Below you can see my netowrk emulation settings + my player settings

[chrome bay]

That's more like 120 ms of lag. up to 60 incoming and up to 60 outgoing.

You can specify them independently to try to simulate poor connection symmetry

But the answer to the question 'why is it laggy' is because well, you're simulating lag 😄

[umbral gale]

You're right the lag is between 60 and 120ms, but as you can see on this video, this client has a lot of rollback even with average settings

[chrome bay]

Can't really tell if that's prediction error or camera arm BS

You can visualise net corrections

[smoky abyss]

I'm making a listenserver game, this works perfectly on client pawn but not on server pawn, anyone knows why? Is probably something very dumb but can't find what is it xD

I call this event in the gamemode

[chrome bay]

Pawn could be null when they receive the RPC

[smoky abyss]

Is called just after spawning it D:

[chrome bay]

Doesn't mean it's reached the client though

[smoky abyss]

But works on client, doesn't work on Server pawn

[chrome bay]

Events on the client can occur in completely random orders, so there's no garauntee the game is in the right state. Takes a lot of effort to make it resilient to it.

Pretty much

Perhaps the order of operations works for clients, due to a fluke of how replication order is working in the editor environment.

[smoky abyss]

Also if I debug, it runs on server and clients, but only works on clients

"enable input" node

[chrome bay]

Check what the value of GetControlledPawn is

Wait a sec

GetControlledPawn being passed into 'Player Controller'? How does that even compile

Oh maybe not actually, can't see with the wires.

[chrome bay]

Check what GetControlledPawn is. Might be null. Should see warnings about it in the post-play dialog if so.

Might be not what you expect even

TBH whether input is enabled or not is probably something the client/lcoal user wants to manage themselves

Even if they're observing some game state value to determine it

[chrome bay]

🤷‍♂️ no idea then, looks like it's working to me. Issue might be elsewhere

[smoky abyss]

do you think so? I don't want players to start moving before the servers tells them to

[smoky abyss]

:/ ok, ty for the time

[chrome bay]

Actually, looking at what that function does in CPP, you don't want to use it anyway

Pawns already have their input enabled when they are possessed. That function is manually pushing/popping the input component onto he controller stack which is going to conflict with it.

[smoky abyss]

But they get disabled input on beginplay

[chrome bay]

An easier way would be to replicate a value that clients can observe, and locally decide whether to ignore inputs or not.

Yeah you shouldn't be using any of that stuff

Enable/Disable input manually creates input components and pushes them onto the controller stack, which is going to break and conflict with the default input logic that pawns have from possession

It's a stupidly named function tbh

Classic unrealism

To do this in easy mode, add a bool to your game state 'bPlayersCanMove' or whatever, and replicate it. Clients can grab that before handling inputs and ignore accordingly.

[smoky abyss]

Ok, will try that

[chrome bay]

You could also use these:

    ENGINE_API virtual void SetIgnoreMoveInput(bool bNewMoveInput);

    /** Stops ignoring move input by resetting the ignore move input state. */
    UFUNCTION(BlueprintCallable, Category=Input, meta=(Keywords = "ClearIgnoreMoveInput"))
    ENGINE_API virtual void ResetIgnoreMoveInput();```

Which belong to APlayerController

Oh but of course, the networking side isn't exposed to Blueprint. Classic.

Multiplayer in BP is a meme

[cold magnet]

Why is child actor component's actor owner not automatically set to whatever the owner of the child actor component is? Ugh... How to even fix this?

I guess I have to RPC on begin play yaaay

[smoky abyss]

At the end it was this

I was using "get controller- > cast to player controller" instead of get player controller

Why "get controller -> cast to player controller" doesn't work?

It was connected, I just disconnected it

Ok, I casted playercontroller instead of my own player controller blueprint... It was very hard to realize this because at the same time I did this, i was making a system to enable/disable input xD

https://tenor.com/view/sad-gif-13261737358986789359

[hoary spear]

Get controller should work as long as you're possessing it

If its doesnt work, you can print its displayname to verify

If it prints nothing, its probably not the local controller

[sleek cradle]

hello everyone. i have followed a course on a multiplayer game, using advanced sessions, in ue 5. i now have a weird situation where i see my dedicated server when running the client from the editor, but cannot join it, not even with open steam.9###. i do not see it in a builded exe of the client, but i can join it using open steam.9####. any ideas please? 🙂

[untold rose]

is it possible to replicate a 2d texture? I have a BP where a 2d texture is passed to a material as a parameter. When this gets updated on the BP (server side), it needs to replicate to all the clients. Any suggestions on how best to handle it?

[chrome bay]

If it's an asset, you can just replicate a reference to it

It it's a render target and you want to replicate individual pixels, then no

[untold rose]

yea it's just an asset, thanks.

[hoary spear]

Repnotify Texture2d variable thats set from the server, which clients (+ server if bp) reacts to the variable changing

[untold rose]

yea I know that, I just wasn't sure if it would work on 2d texture. 🙂

[hoary spear]

I may be wrong, as ive little testing on it so far, but it seems direct asset references rep faster than actor refs does aswel so thats nice if true

[sinful tree]

Only if it's a predefined asset. When you reference a Texture2D over the network, you're referencing the object itself, not what it contains, so if you're creating the Texture2D at runtime others won't have that reference, and if you're manipulating the pixels in some way on one end, it won't be replicated that way to others.

[untold rose]

Yea, it's an image all clients should have.

[dark parcel]

There is plugin for it. Ain't no way to replicate texture 2d without actual cpp codes.

But if both client have the asset you can just point the reference.

[burnt hinge]

How to affect only the interacting client? Do i have to cast to the player controller each time? Doesn't seem to work eather

[sinful tree]

You never want to use the "Get X by index" nodes in online multiplayer.
If this is an interaction from one actor to another non-player controlled actor, you can pass in the reference of the pawn performing the interaction, and from that you can get its controller.

[frank birch]

@pallid mesa and anyone that was interested in the network clock thingy we were talking about yesterday
I am running some tests
https://docs.google.com/spreadsheets/d/1TjSsIVziL5fbTeEMeEVbApauufEsv_d2ZKJau1p-R8U/edit?usp=sharing

my biggest question right now is: Is the window size thaaat important? what if I have 5 sameples? what if I have 20? what happens when lag variation gets big?

with 10 I am seeing an average difference of 16~32 ms
Essentially a frame, however the method I am using for testing has 2ms of margin of error / measuerement floor because I am not hacking the engine but checking the isodates for engine logs 😛

server world time vs client calculated world time (network clock)

[burnt hinge]

I'm getting my character ref as an actor. should i change it to something else?

I'm trying my best but i'm pretty new

[frank birch]

in my calculations I assume roundtrip time is symmetrical (essentially divide by two) but it might not be, that's why even with correction things are never in perfect sync 😅

[sinful tree]

At least pawn assuming pawns (and not just any actor) are the only ones that can perform such interactions. It depends on what you want to be able to do with your interactions. Pawn you can at least get the controller from. Character would allow you to access their character movement component. If there's custom functions you have in your character that you'd want to access, you could just pass along the reference as your character class.

[burnt hinge]

I can't connect a pawn controller with a player controller target.
I'm using an interface to talk between my character & vehicle. To open / close doors & interact.

[sinful tree]

You'd need to cast the controller from pawn to player controller

[burnt hinge]

This worked. Thanks!
Do i have to cast each time i want to use these player controller targets?

[sinful tree]

In the one below you wouldn't as it's only expecting a "Controller" reference.

The top one is expecting "Player Controller"

[burnt hinge]

ah nvm

[frank birch]

~~Why do we make our own sofisticated roundtrip calculators when playerstate has a pingcounter pingbucket and more? 🙃 ~~
Network time is not only your ping, but magical circumstances of when your world clock started

[frank birch]

There is a saying that only one team managed to reliably replicate physics in unreal engine, it's 6 cars and a ball

That being said, I saw that 5.3 has some experimental physics for networj

But I wouldn't bet on it yet 😅

[burnt hinge]

Can someone help with enhanced input for multiplayer? They sent me here

[serene kestrel]

What specifically are you trying to solve?

[burnt hinge]

I'm initially spawning with a third person character but then i want to possess a vehicle. I'm unable to give the input contexts properly

[serene kestrel]

How are you attempting to switch the context?

[burnt hinge]

From the player controller. First when spawning in i'm giving context to character & then trying to switch on possess but it's invalid.

[tame sapphire]

can the game state listen for an event dispatcher on the player controller? (As in can i just cast to the player controller and bind an event to it)

[thin stratus]

In theory yes

[tame sapphire]

for the reference can i just get player controller - cast to bp player controller as i wasnt sure if that existed in the same sense

[thin stratus]

Well, it depends where and when you are binding of course

And that GameState exists once, while PlayerController exists once per player, but only locally or the server

So you gotta be careful what you are binding to

[tame sapphire]

maybe i wont continue that route (Wanted to work on a turn ready and cancel ready)

that wasnt as convoluted as i currently had

[thin stratus]

Ready/Unready is usually something that you do in the PlayerState

[tame sapphire]

well i had a bind in player state to

hence looking at the dispatchers route

as theres also some widget stuff

[thin stratus]

Yeah but it's enough to just do

-> SetReady(bool bNewReady) -> bReady = bNewReady -> Server_SetReady(bool bNewReady) -> bReady = bNewReady -> GetGameState -> CheckIsEveryoneReady

And for visual callbacks, you would have a ref to the PlayerState in your Widget (per Player) and can bind to a Delegate you call from a OnRep_bReady

[quasi tide]

Look at Cedric, returning to his #multiplayer roots. Taking a break from #mass. 🥳

[thin stratus]

They s*ck equally

[tame sapphire]

thats roughly what i currently have, was just looking to see if i could change how its done

thank you

[burnt hinge]

Guys my player controller doesn't give input context to the clients. Works on server. What's the problem?

[quasi tide]

You're not doing it on the client

[dark parcel]

Would it be necessary for server to check if everyone version of ready is ready?

Let's say if the server start the game right after it set ready but the changes haven't reach delaying client. Won't the game start prematurely?

Or am I thingking too much

[icy jetty]

What does he need, an execute on all event to call these mapping context add-ons ?

[quasi tide]

No. There is an event that already gets called on the client when they're possessed. Set it up there.

[thin stratus]

You usually start some countdown to be fair

[burnt hinge]

Please elaborate..

[quasi tide]

There isn't much more to elaborate on. Look at the .h file for the player controller.

I don't remember what it is called exactly and I'm not at a computer with UE available.

[thin stratus]

OnControllerChangedEvent or something like that

Which calls for Server and Client

In BPs

[icy jetty]

Oh, so onPossess can only handle single player? 😀

[thin stratus]

Well it's ServerOnly

[icy jetty]

Doh ofc I forgot to read the fineprint 🤦

[burnt hinge]

Idk how to set it up🥲 🙂

[quasi tide]

I'd recommend learning. Multiplayer becomes a lot easier with it.

But Cedric gave a potential BP event

[steel vault]

Hello!! I am having an issue with simulated proxies responding to movement changes such as toggling sprinting and walking. My custom CMC properly sets movement safe variables to enter these states, but my animations need to respond properly as well on the simulated proxies. I tried loose tags but those don't replicate, am I simply stuck with replicating a variable that changes based on those safe move variable changes? Or is there another way?

Or.... should I even just be replicating simulated only condition on the movement safe variables themselves?

Looking for best practice if possible!

[thin stratus]

    /** Set by character movement to specify that this Character is currently crouched. */
    UPROPERTY(BlueprintReadOnly, replicatedUsing=OnRep_IsCrouched, Category=Character)
    uint32 bIsCrouched:1;

DOREPLIFETIME_CONDITION( ACharacter, bIsCrouched, COND_SimulatedOnly );

[steel vault]

Haha, yea I went back to that as well.. they replicate a separate variable and then command the CMC to change. I was definitely thinking this is how I will have to do it, just wasn't entirely sure.

[thin stratus]

Yeah the CMC has no other info for the SimProxies

You'll notice that when you try to find an event to play a double jump effect :D

[steel vault]

Yea I was stumped like why is this not replicating?! Oh, because nothing is replicated here lol

But the movement modes and speeds are so it seemed like everything else just would be

Ok so I'll stick to replicating another variable then... quick answer, thanks!

[thin stratus]

In the Character that is

Not the CMC :P

[steel vault]

Any problem with including the movement based replicating variable on the CMC?

[thin stratus]

CMC isn't replicated

[steel vault]

Of course, duh. Ok I'll include them in my character then, thanks!

[grand kestrel]

There's literally nothing for this, ran into the same thing

[grand kestrel]

CMC passes it to character for replication because component replication incurs an additional byte to identify the component, doing it manually saves bandwidth

It all gets routed through the actor regardless in the end

[steel vault]

Hmmm, so in this case do I need to RPC to the server if I'm on the client?

Nvm, yea looks like I need to call it on client then call the RPC.

[thin stratus]

@steel vault Well, no, cause your CMC already has the info on the server or not?

There is no need for any additional RPCs usually

[steel vault]

I meant for the bIsSprinting variable

When it gets set on the character, you need to RPC that to the server if you're on the client, no?

[steel vault]

@thin stratus I got everything working by using booleans on the character for is walking and is sprinting but I had to make sure they were set by switching the variables locally if they were a client and then calling a server rpc, or just calling locally if it's the server. I tried without the RPC and the server wasn't changing the proxy properly.

[dark edge]

That will not work in multiplayer

[steel vault]

I just tested it, it does. I'm not sure what you mean

[pallid mesa]

now that we talking about CMC... I wonder.. has anyone attempted to make a sticky "movement mode"? Where the capsule follows the ground below (gravity towards surface) - how many LOC would that be? is it easy? (just curious to get a high level answer... nothing specific)

[dark edge]

Try throw some network quality simulation on it

[steel vault]

Pretty sure 5.3 just allowed for this with gravity functions

[steel vault]

I don't see the problem? What is your proposed solution?

[pallid mesa]

I've tried it :) and its vanila implementation mostly works, although its not really prepared for sticky movement

[dark edge]

You don't see jittering when you sprint with latency simulation on?

[steel vault]

If you're referring to me using isSprinting to change speed, no it doesn't

I have custom CMC implementation for it

The is sprinting is simply for state

The CMC handles a safe move to make sure it doesn't stutter at all

The issue is that the safe move variables don't replicate, so the state needs to be stored somewhere, so I'm now doing it on the character

I went backward.. CMC worked, sprinting smooth worked, but I couldn't animate that state on a simulated proxy

So I needed to store that state in order to replicate it

Now it does just that on the character, and movement speed changes happen on the CMC

The same happens for crouching as exi pointed out. They store the state of if you are crouching or not on the character, but the actual implementation details occur in the CMC. It passes it on

[dark edge]

Ah yeah that's what I thought you were doing. Could the animation state just be derived from speed? Do you care about the animation if the walk speed isn't yet above normal walk speed? (Sprinting from a dead stop)

I suppose the difference is if you care about wants to Sprint versus is actually sprinting

[steel vault]

Yes it could, but I have a ton of speed modifiers in my game, so that would get ugly, mainly why I decided to replicate a variable for state of walking, sprinting, etc.

They're simply telling me what mode I'm in so I can properly tell the locomotion graph what anims to use

And it was overkill to do a custom movement mode since nothing changes aside from anims

It's working flawlessly finally, I just didn't understand what exi meant by me not needing to RPC that state if I'm a client making the change

[pallid mesa]

why dont you use the velocity size

[steel vault]

Yea so like I said, if I"m sprinting and I get slowed by a modifier, I want to still show sprinting anims

So velocity doesn't make sense

[dark edge]

That's exactly what I said but they have a bunch of speed modifiers so walking with high stats might be the same speed as sprinting with low stats etc.

[pallid mesa]

ah got ya haha

[steel vault]

And if you see this Exi, hopefully you can clarify, because I couldn't find a way to properly show sprinting on the server proxy from the client without an RPC. Simply setting the CMC to sprint changes the speed nicely, but I don't think I can get that state on the server without the client directly telling it to do so.

[thin stratus]

@steel vault I think the main confusion comes from you stating that you need an RPC

You said you set up the CMC with proper SavedMoves, and probably using the Flags to set sprinting

So I don't quite get what the second RPC is for

The Server already receives the Sprinting part via the ServerMove RPC

Just set it on the Character

[steel vault]

Are the flags properly set on the server is what you're saying so I don't need to RPC?

[thin stratus]

Well of course

Otherwise the Server wouldn't sprint

[steel vault]

So my safe move variable in my CMC bWantsToSprint can be used?

[thin stratus]

Why the SavedMove

The SavedMove is for the Client

The Server unpacks the Flags ServerSide

If you wouldn't be doing that correctly, you would have corrections

The Client sends the Flags via the ServerMove RPC to the Server.
The Server unpacks the Flags and sets the bWantsToSprint on its end

[steel vault]

I guess what I'm trying to figure out is where exactly to set my bIsSprinting on the character from that CMC flag

[thin stratus]

And the calls StartSprint

And there you can set that to True on the Character too

void UCharacterMovementComponent::UpdateCharacterStateBeforeMovement(float DeltaSeconds)
{
    // Proxies get replicated crouch state.
    if (CharacterOwner->GetLocalRole() != ROLE_SimulatedProxy)
    {
        // Check for a change in crouch state. Players toggle crouch by changing bWantsToCrouch.
        const bool bIsCrouching = IsCrouching();
        if (bIsCrouching && (!bWantsToCrouch || !CanCrouchInCurrentState()))
        {
            UnCrouch(false);
        }
        else if (!bIsCrouching && bWantsToCrouch && CanCrouchInCurrentState())
        {
            Crouch(false);
        }
    }
}

[steel vault]

So I can simply set the character state variables in that function and be good on the server proxy

[thin stratus]

You add

const bool bIsSprint = IsSprinting();
if (bIsSprinting && (!bWantsToSprint || !CanSprintInCurrentState()))
{
  StopSprint();
}
else if (!bIsSprinting && bWantsToSprint && CanSprintInCurrentState())
{
  StartSprint();
}

And in Stop and StartSprint

You set your boolean on the Character

You just set it on Server and Client

And make it to only replicate to Sim

Then all 3 have the correct value

void UCharacterMovementComponent::Crouch(bool bClientSimulation)
{
    if (!HasValidData())
    {
        return;
    }

    if (!bClientSimulation && !CanCrouchInCurrentState())
    {
        return;
    }

    // See if collision is already at desired size.
    if (CharacterOwner->GetCapsuleComponent()->GetUnscaledCapsuleHalfHeight() == CrouchedHalfHeight)
    {
        if (!bClientSimulation)
        {
            CharacterOwner->bIsCrouched = true;
        }
        CharacterOwner->OnStartCrouch( 0.f, 0.f );
        return;
    }

CMC does the same thing

Just follow that code

[steel vault]

Yea I follow you now I think. I just wasn't sure where to set it, but updatestatebeforemovement makes complete sense. I'll give that a shot without my RPC's and that will be super clean. Thanks for the explanation!

[thin stratus]

The bClientSimulation is mainly for their capsule adjustment

That's probably irrelevant for you, so that boolean is redundant

Rest is fine though

[steel vault]

Yea I should have climbed deeper into them setting the character state variable there, makes sense that way

[thin stratus]

Yus

I'm off to bed now

Good luck

[steel vault]

Thanks!

[strong hazel]

Hi all,

I've just worked through the Multiplayer Programming Quick Start example on Epic Documentation (https://docs.unrealengine.com/5.2/en-US/multiplayer-programming-quick-start-for-unreal-engine/)

When I test the game, I note that, whilst it works, I'm seeing the output information on both client and server windows, e.g. the same message. The article suggests that this should be different.

Can anyone advise? Is this the same because I'm running it on the same machine, so therefore the IsLocallyControlled() is true, and the GetLocalRole() is ROLE_Authority (for both client/server windows etc).

    void AThirdPersonMPCharacter::OnHealthUpdate()
    {
        //Client-specific functionality
        if (IsLocallyControlled())
        {
            FString healthMessage = FString::Printf(TEXT("You now have %f health remaining."), CurrentHealth);
            GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Blue, healthMessage);

            if (CurrentHealth <= 0)
            {
                FString deathMessage = FString::Printf(TEXT("You have been killed."));
                GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red, deathMessage);
            }
        }

        //Server-specific functionality
        if (GetLocalRole() == ROLE_Authority)
        {
            FString healthMessage = FString::Printf(TEXT("%s now has %f health remaining."), *GetFName().ToString(), CurrentHealth);
            GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Blue, healthMessage);
        }

        //Functions that occur on all machines.
        /*
            Any special functionality that should occur as a result of damage or death should be placed here.
        */
    }

Thanks in advance for any clarification 🙂

[strong hazel]

One other thing... I've dropped this in for a little bit of debug info (in BeginPlay() on the Character), and it outputs 4 messages in both windows.

    FString AuthorityMessage;

    switch(GetLocalRole())
    {
    case ROLE_Authority:
         AuthorityMessage = FString::Printf(TEXT("%s: I have Authority"), *GetName());
        GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Green, AuthorityMessage);
    break;

    case ROLE_AutonomousProxy:
         AuthorityMessage = FString::Printf(TEXT("%s: I'm an Autonomous Proxy"), *GetName());
        GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Green, AuthorityMessage);
    break;

    case ROLE_SimulatedProxy:
         AuthorityMessage = FString::Printf(TEXT("%s: I'm a Simulated Proxy"), *GetName());
        GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Green, AuthorityMessage);
    break;

    default:
        AuthorityMessage = FString::Printf(TEXT("%s: Something else"), *GetName());
        GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Green, AuthorityMessage);
        break;
    }

Initially, both characters are flagged as having authority, then one becomes a simulated proxy, and one an autonomous proxy. I was expecting, based on the documentation/tutorial, that one would be a simulated proxy, and the have authority.

[chrome onyx]

Print strings will show up on all clients, so you're seeing:
Remote client (servers pawn)
Remote client (remote pawn)
Server (servers pawn)
Server (remote pawn)

Which is as expected - but the on screen messages showing up on all clients can be confusing in some cases for sure!

[golden nest]

Can someone explain to me how to implement an RPC from c++?

I look all over the internet and couldn't understand how to use the functions

I keep getting linking errors >:c

[sharp plover]

I'm having some issues regarding RPCs. I'm using a actor component but somehow if I create an event in there which is multi cast, and unreliable, then it doesn't work. If I set it to reliable then it works. Is it not possible to have unreliable RPCs in components?

[golden nest]

1>VivalandTestProjectile.cpp.obj : error LNK2005: "protected: void __cdecl AVivalandTestProjectile::ServerNotifyPlayerHit(class AVivalandTestCharacter *)" (?ServerNotifyPlayerHit@AVivalandTestProjectile@@IEAAXPEAVAVivalandTestCharacter@@@Z) already defined in VivalandTestProjectile.gen.cpp.obj
1>   Creating library D:\Dev\VivalandTest\Intermediate\Build\Win64\UnrealEditor\DebugGame\VivalandTest\UnrealEditor-VivalandTest-Win64-DebugGame.suppressed.lib and object D:\Dev\VivalandTest\Intermediate\Build\Win64\UnrealEditor\DebugGame\VivalandTest\UnrealEditor-VivalandTest-Win64-DebugGame.suppressed.exp
1>D:\Dev\VivalandTest\Binaries\Win64\UnrealEditor-VivalandTest-Win64-DebugGame.dll : fatal error LNK1169: one or more multiply defined symbols found``` this is the error

[sharp plover]

Would recommend editing your message and include the code which you wrote so others can spot the mistake

[golden nest]

The code

    void ServerNotifyPlayerHit(AVivalandTestCharacter* Player);
    void ServerNotifyPlayerHit_Implementation(AVivalandTestCharacter* Player);```
```void AVivalandTestProjectile::NotifyActorBeginOverlap(AActor* OtherActor)
{
    AVivalandTestCharacter* Character = Cast<AVivalandTestCharacter>(OtherActor);
    AVivalandTestCharacter* LocalOwner = Cast<AVivalandTestCharacter>(GetOwner());

    if (Character != nullptr && LocalOwner != nullptr)
    {
        if (Character->GetPlayerTeam() == LocalOwner->GetPlayerTeam())
        {
            ServerNotifyPlayerHit(Character);
        }
    }
    Destroy();
}

void AVivalandTestProjectile::ServerNotifyPlayerHit(AVivalandTestCharacter* Player)
{
    if (GetLocalRole() < ROLE_Authority)
    {
        AVivalandTestGameMode* GameMode = Cast<AVivalandTestGameMode>(GetWorld()->GetAuthGameMode());
        if (GameMode != nullptr)
        {
            int32 ScoreToIncrease = 1;
            GameMode->IncreaseTeamScore(Player->GetPlayerTeam(), ScoreToIncrease);
        }
    }
}

void AVivalandTestProjectile::ServerNotifyPlayerHit_Implementation(AVivalandTestCharacter* Player)
{
    ServerNotifyPlayerHit(Player);
}```

[golden nest]

The error points that I have two symbols that are defined the same, but I have not. I can't understand.

[serene kestrel]

You're not supposed to define AVivalandTestProjectile::ServerNotifyPlayerHit because Unreal Header Tool does it for you. Only implelment the _Implementation version of the function

[golden nest]

And should I check for Authority somehow? @serene kestrel

Cause I understood that ServerNotifyPlayerHit will be called for both, but ServerNotifyPlayerHit_Implementation only for the server, so that's why my implementation calls ServerNotifyPlayerHit

[serene kestrel]

ServerNotifyPlayerHit will only call ServerNotifyPlayerHit_Implementation on the server, you don't need the check

[surreal plaza]

What is a good setup for testing multiple steam clients quickly with different steam accounts? Like sandboxie?

[pseudo kernel]

For dedicated servers is there any way to have a skeleton update their bone positons for only one frame of an animation. I thought about setting EVisibilityBasedAnimTickOption::AlwaysTickPoseAndRefreshBones during the anim and then unsetting it after, but...

I don't care about bone location most of the time, but I do have an attack animation which spawns a projectile from the hand

[pseudo kernel]

I figured out how to do it with the bone postion finalized delegate... but is it a good idea 😓

[strong hazel]

Hey, thanks for the reply. hmm, that's something I thought they might have mentioned in that tutorial, as what was said would happen didn't.

What would be a better way to achieve (in the terms of output) what the original aim was? Would perhaps outputting to the log be better? Its supposed to output when the "player" loses some health, and I the "server" is supposed to just give a running dialogue of who lost health etc. (there were a few other issues with tutorial, but this one is the head scratcher for me) - thanks in advance 🙂

[sleek cradle]

it seems i dont see my server in editor mode either, its not my server i see? any help with this please or a good resource where i can find help with this? 😄

[dusky yoke]

Hey. When I tested my game yesterday with my friends over a steam session, we noticed that if the host died and as thus was incapable of continuing the playthrough (since I don't have a proper respawn/heal mechanic yet), and the players continued further away, some parts of my code stopped worked, such as weapon tracing. Spawning arrows and everything else worked fine. What could cause such an issue? Never experienced this in my own testing sessions

[hoary spear]

Hopefully not a single instance of "GetPlayerController(Index)" in the code

Is it possible to do some seamless transition from 1 server to local (when you're not initially the server) ?

Basically being connected to a listen server -> to become a listen server

[sinful tree]

I don't think so, at least not while using Unreal's networking system. If you had a custom network solution you could transition things however you want pretty much.

[hoary spear]

Alright. Would be neat with a fallback option, and just swapping netmode at runtime 😅

All the things would more or less exist on the client already

Guesss no GameMode and controllers so that would have to be somehow stored om a client in an inaccessible state

[fierce egret]

How can i save game in dedicated multiplayer project? Does server save all infos of clients or do all clients save their own game?

[graceful flame]

External database server for anything sensitive that might be used for gameplay to prevent cheating such as Gold, Exp, Level…etc

Save locally for stuff like video/audio settings and input keybinds.

[fierce egret]

I dont have an external database for now. Can i try making a save game in project without a database?

[graceful flame]

That’s saving locally aka client side so yea but those files can be edited and shouldn’t be used for anything gameplay sensitive because it’s easy for cheaters to edit them.

[summer arrow]

hi i am having some problem with replicating actor spawn can someone help me

[fierce egret]

Thank you so much, last question is can i use external database without packaging project?

I mean can i use it in project file

[sinful tree]

If your intention is to allow others to host their own servers, you can use the built in save game system just like you would for a single player project. Where you save the data depends on how you want to handle saves and whether all the data is specific to a single server or not. Eg. I connect to one server, and I level up 4 times. If I connect to the same server, I would imagine I would still be level 5. If I connect to a different server, would I still be level 5 or would I be back at level 1? In the first scenario, you'd save my data on the server. In the second, you'd save it on my client and rely on my client telling the server my level.

If your intention is not to allow others to host servers, then you will need to use a database system as you wouldn't want to be storing data that can be accessed across multiple servers VIA a save game binary file.

[graceful flame]

Yeah since the game is just process running on your computer you can make it communicate with a database server via HTTP requests to send / receive JSON data. The hard part is setting up the database to use some form of authentication.

I've been using this free plugin to help out with REST API requests from within blueprints. https://www.unrealengine.com/marketplace/en-US/product/varest-plugin

[chrome onyx]

Since on screen messages happen everywhere, you might need to do one of the following:
-make a hud widget that shows these messages for the relevant clients
-find another function (you can look at the debug camera hud stuff) to display messages only to one screen
-filter/read through the log (but this kinda sucks)

[strong hazel]

Thanks for this @chrome onyx, I did try the log, and preceded each message with who/what was sending it etc, that helped a bit, but I prefer your idea of the individual UI, I'll give that a whirl next.

[sinful tree]

If it's an actor that needs to exist on all clients, the actor class needs to be marked as replicated and you spawn it only on the server, no need to multicast as multicast causes each client to create their own instance of the actor.

[burnt hinge]

line traces should be on the server right?

[sinful tree]

Doesn't have to be. Depends on what you're using them for.

[untold rock]

I'm having issues replicating a pitch varaible, and using it as the spine IK pitch angle. It seems to be replicating in Listen Server mode, but not going to all the clients.

[rose prawn]

You need to show your code and explain what you did.

[untold rock]

bool APlayerCharacter::Server_UpdateVariable_Validate(float NewValue)
{
// Add validation logic here if needed.
return true;
}

void APlayerCharacter::Server_UpdateVariable_Implementation(float NewValue)
{
// Update the replicated variable on the server.
CurrentReplicatedPitch = NewValue;
}

void APlayerCharacter::Look(const FInputActionValue& Value)
{
const FVector2D AxisValue = Value.Get<FVector2D>();
if (GetController())
{
AddControllerYawInput(AxisValue.X * GetWorld()->GetDeltaSeconds() * 10.0f);
AddControllerPitchInput(AxisValue.Y * GetWorld()->GetDeltaSeconds() * 10.0f);

    Server_UpdateVariable(GetControlRotation().Pitch);
}

}

I'm sending a Server network call on the Look function that is excuted on the Client Side.

CurrentReplicatedPitch is a variable that is replicated.

[dim barn]

It looks like you're sending an RPC to update CurrentReplicatedPitch. That doesn't look right. You should just mark it as replicated instead.

Ahh wait, you're trying to send it from client to server. Forget what I said.

[untold rock]

Yeah, it's from the client to server, and then referenced in a blueprint. It only seems replicates when one of the players is a server and client.

[rose prawn]

Did you implemented GetLifetimeReplicatedProps to your character?

[untold rock]

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

DOREPLIFETIME(APlayerCharacter, CameraLocalRotation);
DOREPLIFETIME(APlayerCharacter, TargetCharacterRotation);
DOREPLIFETIME(APlayerCharacter, CurrentReplicatedPitch);

}
Yep, here's that for reference

[burnt hinge]

I'm tracing to see if the player can exit a possessed vehicle

[rose prawn]

Try this:

FDoRepLifetimeParams Parameters;
Parameters.Condition = COND_SkipOwner;
DOREPLIFETIME_WITH_PARAMS_FAST(ThisClass, CurrentReplicatedPitch, Parameters)
//others as well

[dim barn]

Could you show CurrentReplicatedPitch definition in header file

[untold rock]

UPROPERTY(Replicated, BlueprintReadOnly)
float CurrentReplicatedPitch;

[rose prawn]

Also are you sure that Server_UpdateVariable(GetControlRotation().Pitch); is only called from locally controlled player right?

[untold rock]

It's executing off of EnhancedInputComponent->BindAction(LookAction, ETriggerEvent::Triggered, this, &APlayerCharacter::Look);

under setupplayerinputcomponent

[rose prawn]

I'm doing something quite similar, so I will leave you an example. It might help:

//header:

UPROPERTY(Transient, Replicated)
FVector_NetQuantizeNormal LookInput;

void SetLookInputValue(FVector2D NewInputValue);

UFUNCTION(Server,Unreliable)
void Server_LookInputValue(FVector_NetQuantizeNormal NewInputValue);

//class
void ABlindDescentPlayerCharacter::GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const
{
    Super::GetLifetimeReplicatedProps(OutLifetimeProps);
    
    FDoRepLifetimeParams Parameters;
    Parameters.Condition = COND_SkipOwner;
    DOREPLIFETIME_WITH_PARAMS_FAST(ThisClass, MoveInput, Parameters)
    DOREPLIFETIME_WITH_PARAMS_FAST(ThisClass, LookInput, Parameters)

}
void ABlindDescentPlayerCharacter::Input_Move(const FInputActionValue& InputActionValue)
{
    if (IsLocallyControlled())
    {
        SetMoveInputValue(Value);
    }
}

void ABlindDescentPlayerCharacter::SetMoveInputValue(FVector2D NewInputValue)
{
    NewInputValue = NewInputValue.GetSafeNormal();

    FVector VectorValue = FVector(NewInputValue.X,NewInputValue.Y,0.f);

    if (MoveInput != VectorValue)
    {
        MoveInput = VectorValue;

        Server_MoveInputValue(MoveInput);
    }
}

void ABlindDescentPlayerCharacter::Server_MoveInputValue_Implementation(FVector_NetQuantizeNormal NewInputValue)
{
    MoveInput = NewInputValue;
}

[dim barn]

It's also possible that the bug is somewhere else. Maybe it does replicate to all clients correctly. I would start debugging this by adding logs when it replicates to a client for example. To make sure.

[untold rock]

It is going to an animation blueprint, not sure if that could cause issues.

Also, it looks like the same setup as Emrehan's example...

[summer arrow]

how can i mark class as replicated

should i create a class variable and set it replicated or something else

if i make it like that i can not edit the variables i should edit in the first spawning

[rose prawn]

Couple of things that comes to my mind:
1- You might overwrite CurrentReplicatedPitch on other clients. You need to make sure there is nothing setting it except for the owner.
2- You might have forgot to mark your character as "Replicates".

Did you try to print CurrentReplicatedPitch so you can see the values on the screen as a text form?

[summer arrow]

hey do you know how to fix spawning an actor from client and making it replicated from server and all clients

[rose prawn]

Spawn your actor from server instead, and make sure your actor and any variable you want is also marked as replicated.

[summer arrow]

my actor is replicated and all the variables i need from it but it just doesnt work

it runs on server and reliable

pick up object is also replicated in default settings

[rose prawn]

Could be number of things but change "Dropping Item" parameter type to Class and use GetClass in clientside instead, where you actually trigger DropAndSpawnItem.

[untold rock]

Where are you calling DropAndSpawnItem? Is it as a client or server?

[summer arrow]

well it comes from a button when the drop button pressed it casts to character bp and then an not replicated event calls this event

i guess it is from client

[rose prawn]

Create a function in your character, use this function to call DropAndSpawnItem function. Then go to your button, instead of calling DropAndSpawnItem directly, call the last function you just created

Basically, you shouldn't call a server function directly from UI.

[summer arrow]

Uh, okay now i am trying this thanks.

[summer arrow]

IT WORKED THANK YOU SO MUCH

[untold rock]

1- From what I can see, it's only called under the Server_function
2- Character is set to replicates
Printing replicatedcurrentpitch shows that client 1 and client 2 andd servre have the same float

[rose prawn]

It looks like it replicates properly from here unless I'm missing something 🤔

[untold rock]

I think it's something to do with how I'm reading it in the animation blueprint, it works for one client when the client is client and server

this is the intended effect, it only works when playing in Listen Server mode

[rose prawn]

It's probably not related to replication.

Find "Visibility Based Anim Tick Option" in your skeletal mesh (it's in your character)

Select "Always Tick Pose and Refresh Bones"

@untold rock

[golden nest]

It should be able to get the game mode on server

[untold rock]

Still only shows up on one client

[rose prawn]

Well, this is where I give up then. I would need to see your code directly to figure it out, otherwise this will take too much time 😄

[untold rock]

no worries, thanks for trying! i've rewritten this like 4 times now haha

[burnt hinge]

Why is this not replicating client to client? I'm running this off repnotify

[chrome onyx]

I'd always do a print string before to help you understand which clients are actually getting the event

Cause it could be they're getting it and the teleport logic is failing, or they aren't getting it

[burnt hinge]

only 1 client (the executer) & server are getting it. Maybe my target is bad?

[chrome onyx]

Okay so server and owner are getting it, gotcha

What is this object? The controller?

[obtuse loom]

hey guys im having trouble with the gelifetimereplicatedparam

[chrome onyx]

Might be missing the unreal network header include? You can look at other classes with dorep macros and see what they include

[obtuse loom]

i do have the header

[chrome onyx]

I think the folks in the cpp channel probably have the right idea then

[obtuse loom]

ya apparently i had swapped the name of the parameter

[burnt hinge]

possessable vehicle. exit vehicle teleport. i have 2 ways to exit. the other one is on multicast & replicating properly. This one is also connected to it. Sorry if shit explanation

[chrome onyx]

Hmm... If you're just doing a replicated property, and it's not set to owner only, I would expect that to get picked up. Keep in mind that onreps only get called when a change is detected, so just setting a value on server won't necessarily proc the event

If you're saying you have a multicast that works in the same place, that does rule a lot of things out

[burnt hinge]

im setting the rep on line trace detection

[chrome onyx]

Hmm I feel like it might be cleaner if you use the multicast way in both cases... Usually you don't want to use rep vars to throw events like that

More to preserve state

Is that line trace happening only on server?

[burnt hinge]

yes

i tried mc way also but that didn't seem to work eather which is weird. i'll try again

maybe i'm connecting something wrong

[chrome onyx]

Hmm yeah I'd double check that all relevant actors (and any relevant components) are set to replicate

[burnt hinge]

well if it didn't replicate the owning client wouldn't see it eather tho?

[chrome onyx]

Depends how it was spawned I suppose

If it's in the level, each client might have its own un-synced copy of it

Or if it's spawned by everyone independently once the game starts (rather than just on the server)

[burnt hinge]

bruh it's not multicasting eather. what the fudge

hmm 1sec

[chrome onyx]

Yeah I'd cut it down to basics, like see if you can get one message across

Things can be deceptive, an actor spawned independently on each client can look a lot like a replicated actor

[burnt hinge]

i just have the vehicle placed in the world

[honest lantern]

https://cdn.discordapp.com/attachments/846520322642411570/1167938673283710986/image.png?ex=654ff2a6&is=653d7da6&hm=7dafb9e69bb085a1769708ab31aa9c4f42eb3d2f130bde09ef48555b4fdfc7bb&
https://cdn.discordapp.com/attachments/846520322642411570/1167937610124103710/image.png?ex=654ff1a9&is=653d7ca9&hm=1f1ddf9ec22179dbffeb973f730d2230a184015cf635b972b7ed61a4448fa34f&
https://cdn.discordapp.com/attachments/846520322642411570/1167937610468044880/image.png?ex=654ff1a9&is=653d7ca9&hm=d20ba10c6a91a00e3f77501d040f9b84d02682321c7e80257f14a224b64d3384&

so this ppm only works for the clients and not the host...

[latent heart]

Is the material applied to the weapon all teh time?

[honest lantern]

yep

[latent heart]

Is the host being played in the editor and the clients in separate windows?

Or are they all new windows?

[honest lantern]

^

[latent heart]

That might be the issue.

[honest lantern]

ah

[latent heart]

Have you tried packaging your game and testing there?

Do you have "run clients in a separate process" ticked in your editor options?

[honest lantern]

theres an unknown cooking error and i think theres a blueprint error somewhere in the 500+ bps i have

[honest lantern]

i dont think so

[gloomy axle]

Hello! So I was finally able to deploy dedicated servers and have clients connect, but I'm having an issue when the second client connects. The second client doesnt seem to possess a pawn nor does the game mode spawn in that pawn... here's my gamemode:
https://blueprintue.com/blueprint/3jd_vof5/

and my spawn player logic:
https://blueprintue.com/blueprint/nsbn-09u/

I'm not sure why the second client wouldnt be

[latent heart]

You should probably fix that then.

[gloomy axle]

i have two player starts, the first client spawns in fine

[honest lantern]

is there a way to like

scan all of them and see

[gloomy axle]

any help or ideas are appreciated

[latent heart]

Why doesn't spawn player have a target? Or is that just 'self' ?

[honest lantern]

where would this be?

[latent heart]

Search for 'process' in your engine or project settings.

[honest lantern]

i tried that and didnt find anything

[latent heart]

Hmm.

Loads editor

[honest lantern]

lmaoo

[latent heart]

Engine or project settings.

[honest lantern]

ohhh

by default it was ticked and i just unticked it and it still doesnt show the material

right now im just playing it as standalone

[latent heart]

It should be ticked.

Does it work in standalone?

[honest lantern]

no it doesnt

[latent heart]

Definitely sounds like an editor issue.

[thin stratus]

@gloomy axle Isn't your is valid check kinda wrong

Like you only continue the code if the player has a pawn. Not when they don't

It's sure correct to destroy the old one if valid but from what I see it's missing a path for when it's not valid

Also do you have a default pawn in the scene? That could explain why the first client worked

[latent heart]

Just connect the 'is not valid' output to the 'get all actors of class' input.

[honest lantern]

any ideas?

im very new to this type of stuff so im not sure how to troubleshoot

[golden nest]

How can I get all connected players from a widget that's on the client?

My thoughts are that the widget should read from somewhere that data, not the PC for example to send it to the widget, so how can I achieve this if the widget is clientside and cannot reach the game mode?

[gloomy axle]

that sounds about right and yea @latent heart ill test that implementation. no i dont have a default

[thin stratus]

@golden nest GameState and PlayerArray

[golden nest]

Yeah, I know about that, but PlayerArray is in GameMode, and widgets are clientside, so how can a widget access gamemode

[thin stratus]

PlayerArray is in GameState

[golden nest]

Oh, I didn't know that

thanks

[thin stratus]

Check the Compendium again (:

[golden nest]

Is this exposed?

[thin stratus]

In BPs yes

[burnt hinge]

My multicast is not multicasting. Ughh. Wth

[thin stratus]

Is the Server RPC happening in a Client Owned Actor and executed by that very client?

Aka is the Multicast even reached

[latent heart]

Run it in a packaged build (or start the editor with -game) and test that.

[burnt hinge]

yes it says hello to me but only on 1 client

[thin stratus]

What says hello. Where is that hello

[burnt hinge]

after the multicast

[thin stratus]

I assume you mean server and client

Cause the Multicast should at least call on the server

[burnt hinge]

Sorry i got confused. I'm not native

[thin stratus]

You said the Hello only prints on 1 client

[burnt hinge]

on the owning client yes

& the server also

[thin stratus]

Does it also print once for the server?

Yeah thanks that's what I meant

[burnt hinge]

hmm 1 sec double check

[thin stratus]

Is the other client close enough and relevant?

[burnt hinge]

yes server also says hello before client

[thin stratus]

I assume you play with 2 clients and 1 server (dedi or listen)

[burnt hinge]

2 clients

dedi

[thin stratus]

And is the other client close enough?

[burnt hinge]

like 15 meters away

[thin stratus]

Can you try marking the RPC as Reliable

[burnt hinge]

the multicast? no change

[thin stratus]

Yeah. Hmmm

[thin stratus]

Any special replication settings on that actor

[burnt hinge]

i have 2 exit events. the other one works fine. that is also multicast. also entering works fine

[thin stratus]

Any obvious difference between those?

[burnt hinge]

the first branch calls the regular exit, the other one is calling a teleport. which is the broken one. i don't get it

[thin stratus]

Are you sure the other one calls on both clients and isn't just working due to other reasons

[burnt hinge]

how do i check. my brain is not working properly anymore

2am

[thin stratus]

Put the print string on the other one too with a different text

Also if it's 2 am you should probably stop. You might figure it out instantly tomorrow

[burnt hinge]

it says client 0 twice so i guess it's actually not working? just magic?

[thin stratus]

Well probably not magic but you are doing something additionally then

Maybe some OnRep somewhere that the server sets when calling the multicast

Or something that UE already replicates

[burnt hinge]

i don't have any notifys

[golden nest]

If I have to set a variable serverside, is it a good idea to make the setter function a server function?

Or maybe better to create a server function that uses the setter?

[thin stratus]

If you set it from elsewhere too then rather make it 2 functions

But that's mostly code design

Server calling a server RPC will just act like it's a normal function

[burnt hinge]

I might be getting my character references wrong? Now that i'm checking the entering is replicating but also calling only client 0 in reality

[dusk orchid]

anyone know if theres a way to run unreal insights for only the server when playing in the editor? In the editor i'm launching 2 clients and the dedicated server in the background

[burnt hinge]

Guess i found one problem. i don't understand ownership

[ebon jacinth]

Anyone have an idea why clients in a lobby might not be following the host to a listen server? This worked fine until we updated EOS SDK and now the clients never load the level with the host and just disconnect back to main menu:

[sinful tree]

Ownership is a way of saying what client is responsible for a particular actor. When you set the ownership of something to a client owned actor on the server (like player controller, their controlled pawn or playerstate) then it makes an association to that client. At that point, you are able to send RPCs from that client to the server on that actor. It's a security measure so that client's can't just request the server to run whatever they want on any actors that exist. Additionally, if you're trying to call "Run On Owning Client" RPCs on an unowned actor, you'll get similar messages as there is no owning client, you can't send a Run On Owning Client RPC.

Possessing a pawn on the server by a player controller will also set the owner to the player controller that is possessing it.

All of this means if you wanted the client to be able to run "Run On Server" RPCs on the car pawn, you'll need to set ownership of it to that client first or have it be possessed by that client's player controller.

[sinful tree]

You want to look into server travel if you're wanting clients to move with the host to a new map.
https://docs.unrealengine.com/4.27/en-US/InteractiveExperiences/Networking/Travelling/

[burnt hinge]

basically i need to possess it to own it and give out commands. But how can i give a command (event) like entering a vehicle with animation if i'm not owning it yet than.

[ebon jacinth]

Weird part is this has worked for months, then we updated our EOS SDK and somehow the same code doesn't run now

We have a live build with that code, on an older version of the SDK that is up with players on it right now

[gloomy axle]

that fixed it! thank you and thank you @latent heart

now i need to figure out why input controls seem to not work

it seems like mouse movement works because both clients' planes are rotating around, but when they hold down left click to enable boost nothing happens 🤔

oh the boost variables arent replicated, could that be why?

what should I set the boost variables to for their replication conditions if I want other connections to register this connectio is using boost? so they can move around

[keen hound]

Is it possible to have admin commands for certain users?

[latent heart]

Sure, you can do whatever you like.

You just need to 1) add commands an admin could use 2) establish an authenticated user system whereby a remote client can identify themselves as an admin.

[keen hound]

I have 1 down, I'm just curious on 2,
Would it be possible to give it to users on steam?

[latent heart]

Probably. Check out the steam online subsystem to see if you have access to their unique ids.

[gloomy axle]

I keep getting this matchmaking error "Network checksum mismatch" anyone know what it means?

im attempting connections to a playfab server

[latent heart]

Sounds like a version error. Though that's just a guess.

[pseudo kernel]

If we spawn a deferred actor and set replicated properties before finalizing the spawn - will clients have those before BeginPlay is called on the client?

[fossil spoke]

Yes

[gloomy axle]

I keep getting this matchmaking error "Network checksum mismatch" anyone know what it means? it happened after trying to connect a client to a playfab server

[golden nest]

What would happen if I call a cpp server function from bp clientside?

I'm trying to set a username on server from a widget, which would be the way to go?

I code this, so I can call this server function from my widget

    void InitializePlayerUsername(FText NewUsername);
    void InitializePlayerUsername_Implementation(FText NewUsername);```

[half socket]

Hello,
To replicate projectiles, I'm doing this:

void UCogSampleProjectileComponent::BeginPlay()
{
    Super::BeginPlay();
    [...]
    if (GetOwner()->GetLocalRole() == ROLE_Authority)
    {
        COMPARE_ASSIGN_AND_MARK_PROPERTY_DIRTY(UCogSampleProjectileComponent, SpawnLocation, GetOwner()->GetActorLocation(), this);
        COMPARE_ASSIGN_AND_MARK_PROPERTY_DIRTY(UCogSampleProjectileComponent, SpawnRotation, GetOwner()->GetActorRotation(), this);
    }
    else
    {
        GetOwner()->SetActorLocationAndRotation(SpawnLocation, SpawnRotation);
        Catchup(Controller->GetClientLag());
    }
    [...]
}```

I save the spawn location and rotation and get them replicated because, I want remote clients to tick their projectiles on their own.
I want the remote clients to be synced with the server. To do so they need to compute (to catchup) the projectile movement from :
- initial location
- initial rotation
- initial velocity
- Client lag (half the ping)

If I don't reposition the remote client projectiles at their initial values, I get some offset because the server doesn't necessarily replicates the location and rotation of the projectile at their spawn frame. Note that the projectile Actors are set to replicate but not replicate movement (as movement is computed locally)

Is there a way make sure the initial location and rotation are replicated instead of a later location and rotation ?

[gloomy axle]

i would get the player controller, cast to that, get their widget and change text

[golden nest]

But is the other way arround, I want to set a variable reading a value from the widget, setted by the user @gloomy axle

[gloomy axle]

you should be able to get the game instance from the player controller, getting the widget from the pc

game instance is a server thing

[twin juniper]

Does calling an interface message from a multicast event run the implemented interface event on the actor as multicast? (such as how that carries over with using dispatchers, does it work the same?)

[lost inlet]

no

[golden nest]

Why could GameMode->RestartPlayer() be broken? I'm trying to respawn my player on a multiplayer game when hit

I have many PlayerStarts, but when I call the it nothing happens. I'm even calling it serverside.

[thin stratus]

@golden nest RestartPlayer uses the DefaultPawnClass to spawn the player

If you aren't using that you will need to handle it by hand

[clever hound]

• In VR I have 2 constraints which connect my weapon and character together so that the weapon can influence the hand and rotate it and other way around.
• For some reason on the client the weapon goes to the correct position and sticks there but it does not rotate or influence the hand. Only the hand affects the weapon but when the weapon collides with a wall the wrist doesn't rotate. Its only attached to the hand with the physics constraints

1: As client. 2: As standalone/Listen server
When hitting the weapon againts a wall

Im not sure if this laggy movement of the weapon is also related to the same problem

[swift python]

Does anyone know how to resolve "User
LogNetPackageMap: Warning: UPackageMapClient::InternalLoadObject: Unable to resolve default guid from client" on a dedicated server?
Basically I'm dynamically spawning a map (room actors) both on the server and on the client with the same random seed. It all works fine, I don't want the actors to be replicated as it's just unnecessary, as long as both the server and the client have the same map structure they both "see" the same thing
It plays fine, it's just annoying that the server log gets spammed

[clever hound]

I found more about the problem:

• I made a cube and on the server i set its transform to a socket which is on the hand. So the cube shows that the hand bone is rotating on the server but not on the client for some reason. The hand should be rotating and moving in sync with the debug cube

[tight isle]

maybe stupid question, but where the _Validate function for RPC (WithValidate) happens?
(Server or Client or Both)

[quasi tide]

Server

[cold magnet]

See VR Expansion Plugin's source (or just use the plugin) because there it works and is replicated. It's free and on GitHub

[clever hound]

The VRConstraint? Or what do you mean

The only thing im taking from the plugin is the roomscale movement

[cold magnet]

Generally how physics-based grabs where hand/grabbed meshes/collisions influence each other is solved there

[clever hound]

Ty I will check the source but I would like to keep my self made grab, drop and items

[golden nest]

By default you mean the GameMode default? I'm using that, but restart player does nothing when called

[burnt hinge]

So i'm looking at a project from a studio. They have put most server events as reliable. Is this good practice?

[stuck cloud]

I have a general question. I'm learning unreal for the first time and working on a turn based local shared screen game. I would like to keep the architecture in a way that keeps the option open to add online multiplayer later without having to rewrite everything. I started putting a lot of game-flow logic in GameMode and I'm wondering if that's bad practice?

Am I on the wrong path, controlling stuff like adding and removing widgets or input mappings from within GameMode like this?

The way I understand it, accessing player controllers from GameMode should be possible, since they all exist on the server. Those changes that I do on the server, are they then reflected for the clients?

[golden nest]

This is my code and when debugging it runs fine. I also checked for the AGameModeBase functions to run fine.

{
    AVivalandTestGameMode* GameMode = Cast<AVivalandTestGameMode>(GetWorld()->GetAuthGameMode());
    AVivalandTestPlayerController* PlayerPC = Cast<AVivalandTestPlayerController>(Player->GetController());
    if (GameMode != nullptr && PlayerPC != nullptr)
    {
        EPlayerTeam PlayerTeam = PlayerPC->GetPlayerTeam();
        int32 ScoreToIncrease = 1;
        PlayerPC->IncreasePlayerScore(ScoreToIncrease);
        GameMode->RestartPlayerAtTransform(PlayerPC, FTransform::Identity);
    }
}```

[hasty crane]

Hey guys, I'm new to UE, probably basic question. I have a variable (camera pitch). It actually moves the bones so that the character head is moving up and down. How can I replicate that variable from one client to all other clients?

[dark parcel]

Replicate the variable.

Other client would interpolate their bone rotation to the NewBoneRotation (the float that the server rpc send)

[hasty crane]

Yeah but my question is how to replicate that variable from one client to all clients? If I set it to replicate and change it on Client1 then Client1 and Server will have the new value but Client2 won't

[stuck cloud]

Or would you recommend not focusing on online multiplayer at all first? How much more complicated is it to keep things online-multiplayer capable?

[chrome onyx]

Usually the way you do this is to periodically send the input to the server from the owning client (unreliable server RPC), then set a replicated variable on the server (or send another unreliable multicast down from the server)

Tricky parts are
a) ensuring you don't stomp the owners look direction, cause by default owners will also get the onreps/replicated var change and
B) smoothly interpolating the look on remote clients since you're not going to be getting a new look dir every frame

But yeah like... You can just send it up to server unreliable every 0.2s or something and that should get you closer

[wheat niche]

Hey i have a problem i tried to spawn a playercharacter it works but the problem is that only the client can move arround not the server why is that?

[dark parcel]

I was thingking every tick, reckon that's too much?

I thought anything that is transform related should be send asap

0.2 sec, sound pretty slow for head movement

As for the rep condition you can use skip_owner to not replicate it back to the owner

[dark parcel]

But the server pawn spawned? Then I would look into how you implement the input

[wheat niche]

i created a complete new project

[wheat niche]

i have the basic thirdperosn character

[dark parcel]

I mean that's unrelated

Never really use the new input so I'm not sure how it's set up

[wheat niche]

okay i followed his tutorial: https://www.youtube.com/watch?v=H0JZnWdY0k8&list=PLNb7FZ2Nw2HTcJ9Qvy8n2Ou-ZVbsDOMFh&index=6 and for him works everything

[dark parcel]

Try to watch it again I suppose. If he doesn't skip anything you should get it to work too

Just a heads up that multiplayer with bp only is limited and challenging

[floral snow]

Greetings guys!
I am implementing a character selection lobby for a multiplayer game.
The desired flow is as follows:

• Player starts the game
• The game loads the character selection lobby
• The player selects the character
• The game connects to the server => the match begins.

Now the problem that i am facing is how to pass the selected character type to the server in time for it to be used in ADDGameMode::GetDefaultPawnClassForController?

Since the character selection happens offline, once i then connect to the server i am not sure how to make it so that the server knows what pawn to spawn for the player as soon as they are connected?

[latent heart]

You can use the options string when connecting to a server

open server?character=blah or so

You can parse that options string on pre or post login, I forget, in the game mode.

[floral snow]

oh, this looks perfect, cheers!

[latent heart]

Just bear in mind that players can easily fake that option string.

Make sure your game doesn't crash if they do open server?character=lolnoobs

[quasi tide]

The way I handle this is just have a struct that is stored on the client's GI and then when the client joins, they send a server RPC with those values and then the server updates their side.

[floral snow]

how do you handle the rpc delay?

thats the issue i can't find a good solution to

[quasi tide]

Just gotta wait until the server sends a client RPC back acknowledging things

Have some "connecting" UI until that

[floral snow]

right

makes sense, thanks

[quasi tide]

Less annoying than parsing a string, lol

[latent heart]

Parsing a string is pretty easy

[quasi tide]

Doesn't mean it isn't annoying.

[latent heart]

It's not really annoying either.

Maybe in BP...

Much easier to send a parse a string than it is to implement a connecting ui and deal with multiple rpcs.

[golden nest]

Why can I access the GetOwningPlayer()->GetPlayerState() from client widget?

This is my code

Server runs fine, but client shows no player state

Each PC must have its own PlayerState, right?

[dim barn]

1. Could be that PlayerState has not replicated to that client yet.
2. Maybe the cast fails?

[golden nest]

The cast fails because PlayerState is null

[lusty sky]

because of step 1

[golden nest]

But even waiting for long enough the PS never gets there

It's really weird

[dim barn]

Open up your player state BP and print a string on BeginPlay event. It should print on the client after it replicates.

[golden nest]

It's a cpp class

[dim barn]

Even better. Then you can utilize on player rep functions that are already there.

[golden nest]

The weirdest thing is that I'm reading the player score from the ps

[sinful tree]

Are you actually setting the owning player of the widget when creating it?

[golden nest]

Yes, I'm getting the playercontroller on the HUD that creates the widget

I also tried to use GetPlayerController on the widget instead on GetOwningPlayer

But same results

[sinful tree]

Have you tried restarting the editor? There'd be no reason that by the time you clicked a button that the playerstate should be null.

[golden nest]

Let me try

Might be a bug?

[sinful tree]

Seems like.

[lusty sky]

did you set that player state class in editor or game mode

[golden nest]

It's setted in my GameMode cpp constructor

I also checked on world settings if the class is setted in the GM, and it's fine, server can access the PS

But client have no PS

I'm restarting the editor, hopefully that works

Same results

Don't know what's happening

That's what I get when I print the player state

Something else was happening also, when I call GameMode->RestartPlayer(MyPlayer) nothing happens. I debugged the hole function, and all the functions where executing, but nothing happened on my game

I think I'm not getting the right way on replication and multiplayer

Any ideas?

[short arrow]

get the gamestate, get the player array, and check if there are any playerstates valid inside of that array, if any are valid.. Check if the owner is = to your controller

there should only be one item in that array, and the owner should be your controller

assuming you're playing as 1 client

believe it's the same for listen server though

[short arrow]

https://i.gyazo.com/7ea109fd833c046655e2bcfbcec972fc.png

[golden nest]

how would I get the owner of a PS if I'm on clientside

Widgets does not have access to PlayerControllers

Only the owning one

[short arrow]

exactly, and it's not just a widget thing, nothing has access to any controllers other then their own (excluding servers)

in that sense

"get owner" will return null and fail for everyone except your own

[golden nest]

Ohh I get it

Let me try

[short arrow]

all this is doing is checking if there's a playerstate that exists with your name on it

it'll help figure out the root of the problem

[untold rock]

It seems like the viewport player doesn't get the replicated data, but any other extra players do get the replicated data. Does anyone know why this could be happening?

[golden nest]

Well, also couldn't find any value

But if I print the PlayerArray there are 2 PS

If I print serverside the owners of the PS, it prints both player controllers, but clientside prints nothing

Is like client doesn't know that it owns a PS

[short arrow]

that's really odd

never seen that issue before 🤷

do you have the playerstates marked as not replicated?

[golden nest]

{
    bReplicates = true;

    PlayerUsername = FText::GetEmpty();
    PlayerScore = 0;
    PlayerTeam = EPlayerTeam::None;
}```

[digital lichen]

Working with Doonamai, we solved the problem. We had also installed another plugin that had written a port number to our defaultEngine.ini (see screenshot). We removed the port number and now the client can respond to the Connect Challenge Response from the host, and then the client can travel with the host.

[golden nest]

Should I include bReplicates = true in my PlayerController?

I think default is true, but doesn't know what's happening so..

[golden nest]

You should call server replication if you have no auth I think

If you are not the server, you want the RPC

If you are the server, just set the values

[sinful tree]

Controllers only exist on the server and the client owning it. Any other clients won't be able to retrieve the controller in your animation blueprint. This is also pointless. Just get the pawn owner, no point in getting the pawn owner, getting the controller, then getting the pawn again.

[untold rock]

Not sure if I understand what nodes to use, so I tried this. But now its synced to the first player, which makes sense based on the nodes I'm using now. how should I get the character's controller in the animation blueprint?

[sinful tree]

You should only need this in the anim bp.

[untold rock]

millions of thanks

it works now

[short arrow]

are you overriding something?

somewhere

[golden nest]

I found that something I changed on my PC was the problem

But don't know why cause it only input thing

but I deleted the changes and know works fine

[short arrow]

lol that's crazy, glad you figured it out though

[golden nest]

Let me explain what I'm trying to do

Maybe you notice something

I want this code to run both for server and client

{
    StopMovement();
}

// Triggered every frame when the input is held down
void AVivalandTestPlayerController::OnSetDestinationTriggered()
{
    // We flag that the input is being pressed
    FollowTime += GetWorld()->GetDeltaSeconds();
    
    // We look for the location in the world where the player has pressed the input
    FHitResult Hit;
    bool bHitSuccessful = GetHitResultUnderCursor(ECollisionChannel::ECC_Visibility, true, Hit);

    // If we hit a surface, cache the location
    if (bHitSuccessful)
    {
        CachedDestination = Hit.Location;
    }
    
    // Move towards mouse pointer or touch
    APawn* ControlledPawn = GetPawn();
    if (ControlledPawn != nullptr)
    {
        FVector WorldDirection = (CachedDestination - ControlledPawn->GetActorLocation()).GetSafeNormal();
        ControlledPawn->AddMovementInput(WorldDirection, 1.0, false);
    }
}
void AVivalandTestPlayerController::OnSetDestinationReleased()
{
    // If it was a short press
    if (FollowTime <= ShortPressThreshold)
    {
        // We move there and spawn some particles
        UAIBlueprintHelperLibrary::SimpleMoveToLocation(this, CachedDestination);
        UNiagaraFunctionLibrary::SpawnSystemAtLocation(this, FXCursor, CachedDestination, FRotator::ZeroRotator, FVector(1.f, 1.f, 1.f), true, true, ENCPoolMethod::None, true);
    }

    FollowTime = 0.f;
}

So what I did was create a server function that runs the SimpleMoveToLocation, and clientside I send the location value that I get from the cursor hit

Is this the right approach?

Like this

{
    StopMovement();
}

// Triggered every frame when the input is held down
void AVivalandTestPlayerController::OnSetDestinationTriggered()
{
    // We flag that the input is being pressed
    FollowTime += GetWorld()->GetDeltaSeconds();
    
    // We look for the location in the world where the player has pressed the input
    FHitResult Hit;
    bool bHitSuccessful = GetHitResultUnderCursor(ECollisionChannel::ECC_Visibility, true, Hit);

    // If we hit a surface, cache the location
    if (bHitSuccessful)
    {
        CachedDestination = Hit.Location;
    }
}

void AVivalandTestPlayerController::OnSetDestinationReleased()
{
    // We move there and spawn some particles
    Server_MoveToLocation(CachedDestination);
    UNiagaraFunctionLibrary::SpawnSystemAtLocation(this, FXCursor, CachedDestination, FRotator::ZeroRotator, FVector(1.f, 1.f, 1.f), true, true, ENCPoolMethod::None, true);
}
void AVivalandTestPlayerController::Server_MoveToLocation_Implementation(FVector NewDestination)
{
    UAIBlueprintHelperLibrary::SimpleMoveToLocation(this, NewDestination);
}```

What do you think @short arrow ?

Also movement is automatically replicated, so I might be wrong with this implementation

[chrome onyx]

Yeah it's not really going to make a difference since you have latency across the network, so unless you're very low latency, it's going to "click into place". Meaning you'll have to do some form of interpolation on the remote clients, and 5/s is more than enough to interp between

Oops was replying to coldsummer but it didn't tag them

Ffs one more time @dark parcel

[short arrow]

Yeah all that seems fine at a quick glance, I don't see why any of this would cause the issue you were having previously @golden nest

[golden nest]

Ok, let me see what happen

[short arrow]

Though I've never made inputs in c++ so I can't really be sure

[golden nest]

I think inputs work fine cause I'm also shooting projectiles same way and it works fine

But something with movement isn't right

[short arrow]

well, you shouldn't be running AIMoveto or simplemoveto on clients for NPC's tbh

because the server owns them

you should ideally only be running predictions for local owned actors

[golden nest]

I have no npc's

Each player has it's own character that moves when clicking on the map

The code I showed you before, doesn't work. It has no weird bugs, but client doesn't move on click

Also need 2 clicks to trigger the input, wtf is happening here xD

[short arrow]

Oh i see, I think you might be over complicating the movement here. And tbh I wouldn't try to predict anything that isn't math, AIMoveto can be unreliable in my experience

All you need to do whenever you click somewhere is RPC to the server where you clicked

And let the server do the AiMoveTo

[golden nest]

that's what I'm doing

[short arrow]

I wouldnt run this on server and client though

I'm pretty sure that's what you said you were doing

If you're running the movement on both then you're essentially predicting movement on the client

[golden nest]

I think I'm running it only serverside

{
    StopMovement();
}

// Triggered every frame when the input is held down
void AVivalandTestPlayerController::OnSetDestinationTriggered()
{
    // We look for the location in the world where the player has pressed the input
    FHitResult Hit;
    bool bHitSuccessful = GetHitResultUnderCursor(ECollisionChannel::ECC_Visibility, true, Hit);

    // If we hit a surface, cache the location
    if (bHitSuccessful)
    {
        CachedDestination = Hit.Location;
    }
}

void AVivalandTestPlayerController::OnSetDestinationReleased()
{
    // We move there and spawn some particles
    Server_MoveToLocation(CachedDestination);
    UNiagaraFunctionLibrary::SpawnSystemAtLocation(this, FXCursor, CachedDestination, FRotator::ZeroRotator, FVector(1.f, 1.f, 1.f), true, true, ENCPoolMethod::None, true);
}
void AVivalandTestPlayerController::Server_MoveToLocation_Implementation(FVector NewDestination)
{
    UAIBlueprintHelperLibrary::SimpleMoveToLocation(this, NewDestination);
}```

That's the code

Client finds the spot to move, and tell server to run AIMoveTo

When debugging, server gets the location, and runs SimpleMoveToLocation, but client is not moving at all

@short arrow Any ideas?

[short arrow]

Om out right now, you can shoot me a dm and I can possibly help later on if you dont figure it out

[golden nest]

Oh, don't worry, thanks ❤️

[pseudo kernel]

I'm working on predicted projectiles and I'm questioning my approach. I have the player shooting immediately, and know when the proper server owned actor gets spawned, to make corrections.

I've been trying a bunch of stuff with the projectile movement component and have been able to make the server projectile match and interpolate so it looks smooth.

I've been able to take the predicted projectile's scene component and put it on the server spawned projectile... but notice the predicted actor will destroy the scene if it gets destroyed. I wonder if there's a better way, like intercepting the actor spawn and sort of reassigning my predicted actor as it? Or maybe there's an even better approach still.

[golden nest]

Why this code is not spawning the AICharacter and AIController for clients? I think BeginPlay runs for both client and server, but if(HasAuthority()) should leave clients aside and spawn on server for each player that joins.

{
    // Call the base class  
    Super::BeginPlay();

    //Add Input Mapping Context
    if (UEnhancedInputLocalPlayerSubsystem* Subsystem = ULocalPlayer::GetSubsystem<UEnhancedInputLocalPlayerSubsystem>(GetLocalPlayer()))
    {
        Subsystem->AddMappingContext(DefaultMappingContext, 0);
    }

    APawn* MyPawn = GetPawn();

    if (HasAuthority())
    {
        //Spawn AIControlled character
        if (MyPawn != nullptr && AICharacterClass != nullptr && AIControllerClass != nullptr)
        {
            FTransform SpawnTransform = GetPawn()->GetActorTransform();
            FActorSpawnParameters SpawnParameters;
            SpawnParameters.Owner = this;
            AICharacter = Cast<AVivalandTestCharacter>(GetWorld()->SpawnActor(AICharacterClass, &SpawnTransform, SpawnParameters));
            AIController = Cast<AVivalandTestAIController>(GetWorld()->SpawnActor(AIControllerClass, &SpawnTransform, SpawnParameters));
            AVivalandTestPawn* VivalandPawn = Cast<AVivalandTestPawn>(GetPawn());
            if (AIController != nullptr && AICharacter != nullptr && VivalandPawn != nullptr)
            {
                AIController->Possess(AICharacter);
                VivalandPawn->Server_InitializePawn(AICharacter);
            }
        }
    }
}```

[latent heart]

Have you put a breakpoint in there?

Also player controllers only exist on the server and the owning character. If they are AI player controllers, they'll never be on the clients.

Not saying the authority check will break anything, mind.

[golden nest]

I put a breakpoint and only server player is executing the code once, I think. Let me try again

[latent heart]

That is expected.

[golden nest]

I want just the server to have the AIController & AICharacter references, but when client sends RPCs, use the AI references on server. It could work, right?

[latent heart]

The AI controller won't be replicated.

The character might.

[golden nest]

But wouldn't server execute the code once per user on the server?

[latent heart]

(So you can't reference the controller on the client)

[golden nest]

I don't want to

client just tells server "DoThis" with AI

And server uses the references

[latent heart]

Fair enough then.

[golden nest]

So, is it ok? Cause I can't get my client to have it's AICharacter

It's not spawning

[latent heart]

MyPawn may not be set yet when the PC triggers begin play, btw

Try one of the posses events.

[golden nest]

Oh, that's right

[woven basin]

A simple approach is have the firing animation be client prediction - but the actual spawning of the projectile to only be server side. A number of AAA Games do it like this. I think Fornite even does this. I vaguely remember someone (was it ?Kaos) talking about it here a few weeks ago

arh - found it - it was Jambax: #multiplayer message

[pseudo kernel]

Interesting, I can play with that, I guess I struggle to get the projectile to feel responsive or come out of the muzzle location that way. Maybe when the projectile spawns I can retarget and interpolate it still

[pseudo kernel]

Do you know what he means by SSHD here?

If you're using actors/slow moving projectiles, my opinion is it's not worth the hassle to predict them, just accept the latency and use SSHD

[golden nest]

Well, same results

[woven basin]

server side hit detection?

[pseudo kernel]

Ah yeah probably

that makes sense

I guess I can play with that approach and see how it ultimately feels

[golden nest]

I tried this

{
    Super::OnPossess(InPawn);
    AVivalandTestPawn* VivalandPawn = Cast<AVivalandTestPawn>(InPawn);

    //Spawn AIControlled character
    if (VivalandPawn != nullptr && AICharacterClass != nullptr && AIControllerClass != nullptr)
    {
        FTransform SpawnTransform = VivalandPawn->GetActorTransform();
        FActorSpawnParameters SpawnParameters;
        SpawnParameters.Owner = this;
        AICharacter = Cast<AVivalandTestCharacter>(GetWorld()->SpawnActor(AICharacterClass, &SpawnTransform, SpawnParameters));
        AIController = Cast<AVivalandTestAIController>(GetWorld()->SpawnActor(AIControllerClass, &SpawnTransform, SpawnParameters));
        if (AIController != nullptr && AICharacter != nullptr)
        {
            AIController->Possess(AICharacter);
            VivalandPawn->Server_InitializePawn(AICharacter);
        }
    }
}```

[latent heart]

Okay?

Why do you have a server method, btw?

It's already running on the server.

You may wnat to check if the ai controller already exists and if the aichararacter already exist.

or you'll spawn new ones every time you posses a new pawn.

[golden nest]

oh, that's right, I might check for existing ones, but also the client is not spawning

[golden nest]

I override the OnPossess method, I don't have a server function

OnPossess is already serverside only

{
    Super::OnPossess(InPawn);

    if (AICharacter != nullptr || AIController != nullptr)
        return;

    //Spawn AIControlled character
    AVivalandTestPawn* VivalandPawn = Cast<AVivalandTestPawn>(InPawn);
    if (VivalandPawn != nullptr && AICharacterClass != nullptr && AIControllerClass != nullptr)
    {
        FTransform SpawnTransform = VivalandPawn->GetActorTransform();
        FActorSpawnParameters SpawnParameters;
        SpawnParameters.Owner = this;
        AICharacter = Cast<AVivalandTestCharacter>(GetWorld()->SpawnActor(AICharacterClass, &SpawnTransform, SpawnParameters));
        AIController = Cast<AVivalandTestAIController>(GetWorld()->SpawnActor(AIControllerClass, &SpawnTransform, SpawnParameters));
        if (AIController != nullptr && AICharacter != nullptr)
        {
            AIController->Possess(AICharacter);
            VivalandPawn->Server_InitializePawn(AICharacter);
        }
    }
}```

[golden nest]

Oh, Server_InitializePawn() is for initializing the AICharacter on my current pawn so camera can follow the AI character

I might change it to be just a function

[latent heart]

That's the thing, the Server specifier doesn't say, "this is a function that runs on the server"

It means, "Send the call to this function over the network to the server"

(or run it locally if you're already the server)

[golden nest]

Yeah, I want to run it locally on server

[latent heart]

So if you're already only ever running it on the server anyway, it's totally pointless to set it up as a server function.

[golden nest]

Yeah, it is server function cause before I was running this on BeginPlay, so I might change it

But that's another point

[dark parcel]

Make sense

[golden nest]

If I run if (HasAthority()) on tick, it will execute in client actor but serverside only?

[dark parcel]

Don't think so, it will prob run in the machine controlling the actor since it have authority over it

Check roles and print them above your character head

[golden nest]

So I might check roles for that?

This is my code

{
    if (FollowedActor != nullptr && HasAuthority())
    {
        float InterpolationSpeed = 10.0f;
        FVector NewLocation = FMath::VInterpTo(GetActorLocation(), FollowedActor->GetActorLocation(), DeltaSeconds, InterpolationSpeed);
        SetActorLocation(NewLocation);
    }
}```

I want my Pawn to follow an actor and I thought that checking for Authority would do this only on server, so position is automatically replicated

[dark parcel]

Maybe get the is server check instead has authority if u want server only

[golden nest]

How is that?

[latent heart]

It should work as you think.

[golden nest]

Well, it does not, on client the pawn does not follow my FollowedActor

I only set FollowedActor on server btw

[dark parcel]

Nvm I didn't get it right

[golden nest]

FollowedActor is also replicated

[latent heart]

The actor or the variable?

[golden nest]

The Variable

[latent heart]

Does it need to be?

[golden nest]

No, but it's old code haha

I will print something to screen to see what's up with this

I remove the replicated thing on FollowedActor variable

Well, it's "Following' the character, but nothing happens

[golden nest]

Maybe checking for GetLocalRole() == Authority?

I think HasAuthority() resolves where the actor was spawned, if on server then server has authority over it.

But, doesn't work as expected

[sinful tree]

Authority is technically whoever spawned/has ultimate control of an actor.

[golden nest]

Yes, but it does not update the position of my pawn don't know why

It's spawned on server, but doesn't update the position for clients

And transform is automatically replicated

should I set bReplicates = true;?

[sinful tree]

On the actor, yes, otherwise it wouldn't be replicated.

[golden nest]

Also on pawns?

I thought bReplicates was already true for pawns

[golden nest]

I set bReplicates = true but still not following, I don't know what else could I do

[sinful tree]

Are you sure followed actor is valid on the server?

[golden nest]

Yes, it is setted correctly

I created a server_function to update the location to check what happens

[sinful tree]

Ok, possession seems to impact the ability to move the actor with set actor location.

[golden nest]

So how can i move my pawn based on AICharacter?

Maybe attaching my pawn to the AICharacter or something like that?

[golden nest]

What do yo recommend?

I displayed the location of my pawn, and it's following the character, but my camera does not move

[potent pewter]

Hi everyone, I'm looking for a guide, documentation or something to help me create an MMO TPS Shooter that will initially include:

• Authorization
• Creating a character in the appearance editor and then saving the appearance to the DB
• Tutorial after creating an account
• Server selection
• Main menu:
  -Start Game / Join Game [Game Session Browser].
  Start game: select mode, map, and number of players.
  -Store [costume, weapons, items]
  -Inventory.
  At this point I have little to no knowledge of programming languages, before this I have at most edited existing code
  I realize that it takes a lot of time to learn how to create a dedicated server and database and have no illusions that it will be quick and easy. I just need a point from which I can start learning by practicing.
  Thanks in advance for your advice.

[teal frost]

Personally what I do is I just jumped into making a pretty simple project with a small demo scope. When I want to implement something I look up that thing specifically, then familiarize myself with all of the nodes and code that are used and what they're actually doing and why.

So more or less
Look up something specific,
Replicate it yourself to your project,
Then go back and garner an understanding of each aspect of it.

Also helps to look up several tutorials. There are almost always many ways to achieve the same thing.

Also just read around the ue database

With that said

Is anyone available to help with solving a spawning replication issue?
Server is setting the spawn transform, everyone but the owning client see's it as such. Does this for every pawn.

[latent heart]

My advise is start small. Don't even consider making an mmo as your first, third, tenth game. Especially in UE.

[potent pewter]

Thank you, ah, about database i was talking about MySQL)

[latent heart]

And don't connect your game to a database.

[teal frost]

I was referring to this https://docs.unrealengine.com/4.27/en-US/WhatsNew/

[latent heart]

Use an intermediary like a webserver.

[potent pewter]

Got it, thank you guys)

[golden nest]

could this PrimaryActorTick.bCanEverTick = (Role == ROLE_Authority); for this code?

{
    if (FollowedActor != nullptr && HasAuthority())
    {
        float InterpolationSpeed = 10.0f;
        FVector NewLocation = FMath::VInterpTo(GetActorLocation(), FollowedActor->GetActorLocation(), DeltaSeconds, InterpolationSpeed);
        SetActorLocation(NewLocation);
        if (GEngine)
        {
            FString LocationString = FString::Printf(TEXT("Actor Location: X=%.2f, Y=%.2f, Z=%.2f"), NewLocation.X, NewLocation.Y, NewLocation.Z);
            GEngine->AddOnScreenDebugMessage(-1, 1.0f, FColor::Yellow, LocationString);
        }
    }
}```

Maybe on BeginPlay()?

@latent heart I found out that PrimaryActorTick.bCanEverTick = HasAuthority(); disables the printing

So, this hole time tick was running on client

[latent heart]

Are you running HasAuthority in the constructor?

[golden nest]

On BeginPlay() I run PrimaryActorTick.bCanEverTick = HasAuthority();

[latent heart]

That shouldn't do anything.

[golden nest]

Shouldn't it disable client tick?

[latent heart]

I think?

[hollow eagle]

bCanEverTick should only be set in the constructor.

[latent heart]

Yeah.

[hollow eagle]

Changing it does nothing once the actor spawns.

[latent heart]

You want to enable or disable the tick, not whether it can tick.

[hollow eagle]

If you want to change whether you're ticking at runtime call SetTickEnabled

[golden nest]

{
    SetActorTickEnabled(HasAuthority());
}````

So this should enable server and disable client?

[golden nest]

I'm just trying to do this tick follow, but doesn't work for clients and really don't know what else to do :/

[hollow eagle]

yes

but bCanEverTick needs to be true in the constructor

[latent heart]

The only way you'd set that different in client vs server is if you had a dedicated server and dedicated client build.

[golden nest]

Yeah, I'm just trying everything to see what works

Is there another way to check for server? @latent heart @hollow eagle

[latent heart]

Not at construction time.

[golden nest]

I mean in tick

[hollow eagle]

again, what you just posted will work fine

[golden nest]

But it's not

[hollow eagle]

bCanEverTick = true in the constructor
SetActorTickEnabled in BeginPlay

then you're doing something wrong

and it's not directly related to this

[golden nest]

I'm not even spawning this class, is the default game mode pawn

I don't really know what to test

[latent heart]

Put a breakpoint in your tick function: cpp if (!HasAuthority()) { __debugbreak(); }

If it hits that, your client is ticking.

[golden nest]

Like this?

{
    if (!HasAuthority())
    {
        __debugbreak();
    }

    if (FollowedActor != nullptr && HasAuthority())
    {
        float InterpolationSpeed = 10.0f;
        FVector NewLocation = FMath::VInterpTo(GetActorLocation(), FollowedActor->GetActorLocation(), DeltaSeconds, InterpolationSpeed);
        SetActorLocation(NewLocation);
    }
}```

[latent heart]

And this

And test it.

You may need to disable running them all in separate processes or attach to a client to check, though.

[latent heart]

Did you do teh beginplay thing?

[golden nest]

Let me build again

[golden nest]

Well it did not break

[latent heart]

Then you're ticking as expected.

Though I'd probably not use breakpoints for multiplayer builds. Maybe on-screen logging.

[golden nest]

So, tick is working fine, but why client camera is not moving? Can you help me figuring out?

[latent heart]

Some replication setting in the camera probably

Plus, if it did work, it'd be horribly janky over the network.

You should do it on the client too.

[golden nest]

I noticed something. My PC that owns the pawn that ticks to follow, spawns a projectile with PawnLocation, and when the AICharacter moves, the projectile keeps firing from the camera position. So, it means that the pawn is never moving, right?

{
    FVector SpawnPosition = GetPawn()->GetActorLocation();
    FRotator SpawnRotation = GetPawn()->GetActorRotation();

    Server_SpawnProjectile(SpawnPosition, SpawnRotation);
}```

That function OnShootStarted is called by user input

[pseudo wagon]

Does anyone able to run multiple session in single dedicated server?

[thin stratus]

@pseudo wagon It's one session per server

You can host multiple dedi servers on the same cloud server with different ports fwiw

[smoky vessel]

Greetings! Does anyone know how to fix this? I started the game on two clients. The first client starts moving, and the second one follows, but the second one collides with the first as if it's a ghost. It feels like the server understands that the cars aren't moving, but the clients don't. Meanwhile, the HUD displays that it's a sports car

[crisp shard]

Is it fine to be using the same player state for multiple levels (main menu, open world, mini game) while saving player data in that player state across all of those levels? This data is universal to the entire game/world but for example I have a pre world level where players will create a profile and thus us where I would creating their save game files and then in the open world I’d be loading it from that save game all of the days of which is stored in the player state which would be used in all of these different levels.

[stuck cloud]

Can I manage client widgets from withing GameMode? I have all player controllers stored in a player list but I'm not sure if I can manipulate the PlayerControllers on the servers. Are those changes I do on the server then happening for the clients too?

When I try to start my project with 2 player in client mode I crash with this:

[chrome bay]

Clients should manage HUD themselves locally. GameMode has no functionality/doesn't exist on clients.

That's not where the crash is, the crash is further back in the stack. A Fatal log message has been triggered

[stuck cloud]

I add the local HUDs from within GameMode through accessing the player controllers / HUD that are stored on the server and call functions that should run locally on the clients. Is that also not possible?

I do stuff like this basically:

From my understanding (that is very limited 😄 ) this should add the HUDs to the player controllers that are also present on the server

Does anyone have some recommendations to learn how to do multiplayer in unreal?

[chrome bay]

The HUD instance doesn't exist on the Server, it only exists on clients.

HUD should be doing something like listening for an event when the game starts etc.

[stuck cloud]

Ok thx! I will have to change some things generally I guess...

Is there a recommended way of triggering events from within GameMode that can be listened to on the client side?

[tranquil yoke]

GameMode is available only on server

[chrome bay]

You would usually use the game state to replicate mode-level information

[stuck cloud]

Ok thx. Something like triggering the events in GameState by accessing GameState in GameMode?

[tranquil yoke]

You want to trigger something on client when something happens on server?

[stuck cloud]

Yeah, I'd like the server to decide for example when new Turns start and whos Turn it is in my turnbased game

Right now I do that in GameMode but I was just doing local multiplayer so far

But I'm starting to think that I miserunderstood what GameMode is meant for 😅

[tranquil yoke]

In multiplayer Gamemode is only in server, so you cant send anything from server to client, Gamestate is available on server and client, so if there 3 clients there are 1 game state on server and 3 on client. (each for one client), so replicated parameter created on Gamestate will be accessible everywhere

[stuck cloud]

Cool, thx. So changing GameState on the server side and then reacting to changes in GameState on the client side is probably the way to do it

[tranquil yoke]

Now you can control UI on each client using parameters defined inside GameState, which is replicated so when you change replicated parameter on server it will go client and client will display on UI.

[stuck cloud]

Nice yeah that sounds like how it's supposed to be done

[jovial mantle]

sorry for the repost... trying to get some help >_> sent it in general chat but it just got lost in other messages.

Hi! im kinda new to Unreal and I was working on my physics based player controller and I happened to stumble upon this video, https://youtu.be/YB_ew3j_HFw?si=q0pZDs0WoDGW8iMy

It mentions how blueprint isnt suited to handle interpolation with physic movement in a high ping network environment. And that tutorials on youtube does not cover that issue in their video tutorials.

I begun to search up some other resources and found this video below which managed to fix the jittery physics based movement of his vehicle after increasing the framerate of the Engine Physics refresh rate. https://youtu.be/43Qr41NFx3c?si=-XwKy8KJDyePIf4O

Could someone confirm / deny if that is true? (That blueprint physics based player controller movement has issues with interpolation during high ping network environment) or is it false?

And is it possible to make use of blueprints to create a good custom physics based movement player controller that would have good interpolation on high ping to make it not loot jittery?

(Feel free to PM / ping me if u would reply to this thx!)

[tranquil yoke]

You should learn more about how multiplayer works before doing basic tasks.
Learn what is game mode , game state , player state, player controller, and what is the scope of these actors interms of multiplayer.

you need to get in this mindset of multiplayer first then things will become very easy.
https://cedric-neukirchen.net/docs/category/multiplayer-network-compendium/
read this, try to understand it

[stuck cloud]

Thx yeah you're right. I'll check out the link, looks cool

[tranquil yoke]

you should also read about RPC, and how RPC can be sent, because not every actor can send RPC to server only those which is owned by the client.
Once you understand ownership of the actor, only then RPC works correctly.
each actor can have replicated parameters if the actor is replicated but it is not true for RPC.

[stuck cloud]

Yeah I didn't even read about RPCs yet. It's my first time learning unreal and I thought I'll do local multiplayer only but then quickly realized how multiplayer is such a integral part in unreal and since I started using the GameplayAbilitySystem which has multiplayer in it's core I now decided to make things work online too. I think it's not too late now since I'm only 4 weeks in

But I'll check it out next. I think I have to take a break from implementing stuff and do some reading/learning the basics now

[jovial mantle]

Could someone help me?

[jovial mantle]

Uhh, just to confirm, like u mean "no" it is probably not possible to create a physics based blueprints player controller with good interpolation on high ping? to prevent it from looking jittery?

Sooo I should probably try to create my player controller with C++ instead?

ah okay thx! also, does UE4 C++ tutorials work for UE5 C++?

It should be roughly the same right? other than maybe some functions depreciated here and there? Cos I noticed there is not alot of UE5 C++ tutorials around

also, by any chance do u know which specific features I should be looking at? for player movement replication over the network?

oh dang alright... I from asia so I might be asleep by then T_T whoever sees this please just drop me a DM or something

Ah I tried ue5 general but no one replied and the conversation went off somewhere else

[quasi tide]

Every "fix" I've seen for physics driven stuff, was done in C++.

[jovial mantle]

i posted it like 3-5 hrs ago u r the only one that replied to me so far

true =/

[quasi tide]

So, while I don't really do much with physics at all, I'd say that it is impossible to do it exclusively in BP based on that alone.

[jovial mantle]

hmm okay thx!

[quasi tide]

That said - Epic is working on stuff like that. So in the future it might be possible.

Making Chaos more networking friendly that is.

[jovial mantle]

is chaos physics really that much different from UE4?

[quasi tide]

I've seen some commits about it.

[quasi tide]

Going from PhysX to their homegrown solution, Chaos.

[jovial mantle]

oh... ._.

Oof alright

[quasi tide]

It is bad in the short term (less performant for a lot of people), but potentially good in the long-term (more control for the needs of Unreal Fortnite)

[jovial mantle]

Anyways thx for all the help! at least now I know to avoid blueprint tutorials for physics based character movement and search for C++ instead. I found one that seems kinda promising but kinda busy rn so hoping it would work when I do get around to testing it

[stuck cloud]

When playing in the editor with Net Mode set to Client, is it normal that the screen is black for 1-2 seconds until the game starts?

[sinful tree]

Yes

[stuck cloud]

And is it also normal that some actors already tick during that time period? I get errors during the tick fuction for an actor until the game is loaded

[sinful tree]

They can. The server starts up in the background and spawns things before your client views are ready.

[stuck cloud]

Ok cool, that makes sense. PlayerControllers are not ready yet either I guess. Thx for the help

[hasty cipher]

Hola Amigos. I’m searching for a multiplayer development teacher to help me find the mistake I made with a few things. I really need to finish my project the end of november. I would pay you for a online teaching session.

[teal frost]

Anyone available to help me learn how to fix a pawn spawning replication problem? Lol

[fair latch]

Isnt spawning as simple as it get

[teal frost]

I thought so

[fair latch]

Tick replicate in the actor you want to spawn then spawn it from server

[teal frost]

Yeah
The problem is
Like the 4 methods I've tried
Everything "works"
Everyone sees everyone in the correct orientation.
But everyone sees themselves with the wrong orientation.
Corrects itself on movement.

So server is working client is not.

I've tried handling the spawning on server, client, and Mc.
Through PC and GM.

Same result no matter what I do.

[fair latch]

Only server should spawn a replicated actor

[teal frost]

Thats what I thought and how I had it originally and have it now

[fair latch]

It dont matter where you call the node as long the server the only one spawning it

[teal frost]

I figured but st this point idk what to do so I'm just trying things lol

[fair latch]

Dont u set the rotation for the spawn?

[teal frost]

Setting it to the player start they spawn at.

On the server they're spawning with the correct transform.
On client side everyone is spawning with rot 0-0-0

[fair latch]

Not sure if rotation is replicated in cmc by default, i only get to spawn cubes soo far. If thats a problem for you then maybe you can update the transform to each client after spawning

[teal frost]

Did that, and it kind of works.
The problem with that is it doesn't correct the camera positioning.
I'll probably dig deeper into that to see if there's a solution to that which I'm sure there is, but the 2 things I tried just broke my camera lol

[fair latch]

How does that break ur camera? Rotate the whole actor dont rotate the components

Just use set actor rotation via rpc

[teal frost]

I know, I did.
And I'm not sure.
I can post a video later.

What happens is
Pawn spawns
Then rotates but the camera stays in the same place.

Then if I reset the placement of the camera rotation it gets all funky