multiplayer

[weak linden]

You ideally need to figure out why you're getting stuttering in the first place, are you moving the character in a non-standard way causing the server to correct your position, is your network congested, have you accidentally left net emulation settings on, etc, etc

[torpid girder]

no?

[sonic python]

It's wrong see kamikaze

[sonic python]

This

[sonic python]

Mine is for a short term solution . Isn't it ?

[weak linden]

No, it's prone to allowing cheating, those options essentially tell the server to trust the client, which in most cases is something you should never do

[torpid girder]

ah

oh yes i am now at position x,y,z

[sonic python]

Trust is important (. ❛ ᴗ ❛.)

Okay Just Kidding

Okayy after finishing this let's come to my problem

https://forums.unrealengine.com/t/animation-stutters-on-listen-server-for-remotely-controlled-pawns/141889

Try this

[weak linden]

Yes, so at a quick glance from your widget blueprint, I think, you may need to rethink how you're equipping of items works, ideally you want to have the server control the equipping process.

Example:
Player picks their desired clothing, items, etc in the UI, you can, as you are, store that in the game instance for later use (since that is unique to each player), then you need to send that information to the server (probably via the player character), the server then either spawns those items and attaches them.

I assume in your case, you have pre-defined components already in your character that just need a mesh assigned? In which case, instead of the server setting those, you send the information needed to "find" the data (RowName and Category) from the server to clients (via a multicast event) which then will find the meshes from the datatable and set them there.

[sonic python]

That's what I did

?

Maybe there's a problem in multicasting?

[weak linden]

Does this EquipItem function run a server event inside the character?

Because, from what I can tell, that function itself, is not replicated to the server

[sonic python]

I tried running a server event

But When a player is choosing another player is unable to choose

When I did that

[weak linden]

Okay, so let's start from the top, just so I can understand how you're doing things, when do players get the UI to pick their items? Is it before or after they spawn in the world?

[rose prawn]

The code above is in the widget. You can see a function that sets brush colors of border. BecomeActiveSlot is server replicated, but widgets only exist on local machine, so that function will never work

[weak linden]

None of those functions in the widget blueprint are server replicated though (not in that screenshot)

[rose prawn]

It marked as server replicated, but it won't work

[sonic python]

Ui is working fine I think?

[sonic python]

Oh what?

[weak linden]

Oh I missed that one, yeah, that'll never work

[sonic python]

Not pick , they choose it like they buy items from a shop and from inventory they choose the item

[weak linden]

Widgets themselves cannot call RPCs that're declared inside them, since widgets are only "client side"

[sonic python]

Oh then should I have it as not replicated?

[weak linden]

You have to do it so that when the player presses the button, it calls a function that is in the character class itself

[sonic python]

Oh

[rose prawn]

My point is you should really stop doing anything and read & watch tutorials about how replication works

[sonic python]

Should I replicate that equip item

In the Tp character

[rose prawn]

There are so many severe problems in codes you showed

[sonic python]

Whaaat?

Kamikaze?

[weak linden]

No, BecomeActiveSlot itself won't work as a replicated function.

How does your item system work? Are you spawning actors for stuff and attaching or are they mesh components that're already setup in your character?

[sonic python]

I guess I'm spawning

[weak linden]

Using SpawnActor?

Or are you creating components via AddXXXComponent?

[sonic python]

I'm setting the skeletal mesh..

[weak linden]

Okay, so your character already has the components, that's fine, give me one sec

[sonic python]

Okayy

[weak linden]

What you want to do is something like this:

Player presses the button for "buy" -> grab the information for what they "bought" -> get your player character blueprint (the same way you are already should be okay) and call a server replicated function that is within the character blueprint, inside the character, you want to send the table row and category to a Multicast function (that is also inside the character blueprint), and then from that function you can finally get the mesh from the data table, then set the mesh.

So, from where you are, BecomeActiveSlot shouldn't be replicated, EquipItem should be server replicated, then you just need to add the extra multicast that will do everything from your last screenshot

[sonic python]

i guess i want to do that

if the equip item is server replicated

the client is not able to choose the dress till the server enters the match

[weak linden]

I'm not really sure how that's happening, by server replicated, it means the "server side" of the game, which should work whether that player is spawned or not, unfortunately I'm not able to help more 😦

[sonic python]

one min

this is in charac bp

This is the problem coming

right one is the server

[sonic python]

Oh ok. Really Thankful for help you did now

https://tenor.com/view/rudy-kobansky-profitansky-power-respect-respect-bro-gif-15464776

okay i guess

how it is now itself is okay i guess?

ill change it in update with more knowledge

its not wrong isnt it , they are sure equipping the dress , and having it in the game

but just their dress is not seen for others

isnt it?

[torpid girder]

i am still baffled why my characters spawn falling through the floor on the remote client, but when you die and respawn again, its all ok

ok so i disable replicate movement and good the character doesn't fall through the floor, enable it and bye bye

why would the local client start to compute the position of a proxy character?

[sonic python]

ok

now how to make

in game currency for in app purchase

[torpid girder]

i built a number of web services to handle currency etc

i don't want lots of logic going on with the server

[quasi tide]

So I was testing my ammo counting logic with a bad connection and I noticed that it fails in poor connections. Say you fire fast, the client can get out of sync with the server - client has 5 bullets left, but the server says it has 8 (because the other shots haven't gotten to the server yet). The server then replicates it back down to the client, jumping the client's count back up to 8. Thus allowing the poor connection to fire more rounds than they should.

What would be a good way to handle this? My first thought was, in the onrep, only accept it if it is less than what the client thinks it should be. Thought process is that the server should always only be a few behind, but if a cheater wants to adjust their ammo to greater or equal to what the server says it should be, it should just be ignored. There shouldn't really be a time that the server's ammo is less than the client's after the onrep has fired.

Thoughts?

[versed ocean]

trying to hook into the loading process to load up some details from mySQL -- no issues on DB / loading code... but WHERE should I hook? do I hook into my derived GameMode? I thought it would be based on some of the comments the InitNewPlayer event, but that doesnt seem to ever trigger? I'm running dedicated server

Nevermind, was lying -- had engine set to launch as client, so must have been launching a dedicated server in another thread or something without a debugger attached, changed that and now it hits. Appologies

[torpid girder]

so i have this spawn code, it checks for a key in the PC, looks up the base character from the data table and i simply GetWorld()->SpawnActor, sometime changes the second time around, and proxied players don't fall through the floor as they do the first time a player spawns into the game

i am wondering, there must be something that controls actor creation on the client?

[unborn nimbus]

Is AActor::DetachFromActor replicated automatically?

[quasi tide]

I believe so

[unborn nimbus]

That's what I thought

[quasi tide]

I'm pretty sure there is a piece inside of the C++ code that highlights that it is replicated.

I believe I recall seeing something like that with the attach equivalent

[unborn nimbus]

ah yea in the component level method there is

[quasi tide]

That's the one that should be used I believe. Attach/Detach from component. Isn't the Actor variants depreciated 🤔

[quasi tide]

Ahh it was the root component variant that I was thinking about

[sonic python]

Hey hey hey

When a weapon is picked by client ,how to make the server or others see that the client has the weapon picked up

[eternal canyon]

Are the shots that aren’t taken into account on the server actually doing any damage or effects?

Otherwise it’s not rly a problem

[graceful flame]

Repnotify

[sonic python]

Repnotify what the weapon variable?

[ancient moth]

Hi ! I'm working on a lag compensation system with server rewind. I have a working rewind system able to confirm hit and I'm trying to use it with a physic-based ball. The players hit by contact the ball, and the ball moves. Is there any function to apply a trajectory correction after the hit confirmation ? How can I recalculate the new correct location and velocity of the ball based on hit in the past ?

[graceful flame]

Which ever variable changes that you've setup so you can track which weapon is picked up.

Maybe its an enum of all your weapons

[quasi tide]

All the shots are taken into account. It's just a matter of latency. Under poor conditions, the client can get more shots done.

[eternal canyon]

Uhhh are they separate rpcs or smthn?

As you’d typically wanna subtract ammo when u fire the shot on the server

And make sure that u ofc check

[eternal canyon]

U can still predict ofc

[quasi tide]

That's the exact thing that I'm doing

But under poor conditions - the server onrep overrides the client's value.

[eternal canyon]

Then why would the client be able to fire shots without checking the ammo in the server?

[quasi tide]

You already have the correct ammo count locally. Doing an rpc to check the ammo count before you can fire can lead to very unresponsive controls under poor connection, 'cause you have to wait until the server responds before you can fire.

I'm not planning on implementing rollback per se

The client already has the ammo count locally. You can use that to check if the client can fire.

1. Client checks if it has the ammo to fire
2. It passes and then fires and tells the server that it fired
3. Server validates that it was allowed to fire as well and then processes the firing (while also reducing the ammo count)
4. Client reduces it as well.

In a single shot scenario - this is all fine & dandy. But if you encounter a situation where the client shot 3 times (reducing the count from 10 to 7), but the server hasn't received the RPCs for firing in time for the ammo to onrep back to the client, the server will override the client's prediction more or less and adjust it to what the server says it should be.

So client fires 3 shots. Ammo should be 7. 2 RPC's get to the server and the server says the ammo should be 8. Client gets that and updates its value locally. Final RPC is received, server updates it back to 7. But client has already fired again at this point, so client says it should be 6 or 5. Server overrides it again. So on and so forth.

[quasi tide]

Yes. Just write it where it shouldn't matter if it is listen or dedicated

[graceful flame]

Listen means cheaters can cheat without much difficulty. So if something like speed hacks doesn’t matter in your game then sure.

[quasi tide]

UE makes it quite easy to do so

[dark edge]

Only the host, but if your host is cheating then what's the point. You wouldn't run listen server for a competitive game but for something you want to play with friends it'd be just fine.

[quasi tide]

You wouldn't run listen server for a good and fair competitive game

[graceful flame]

The difference being that if a cheater tries speed hacking on a game with a dedicated server they’re constantly having their position corrected by the server and so they appear to stutter in place instead of speeding forwards.

[ancient moth]

It's not that easy, but it's doable. In listen server, you have additional code to handle the fact that the server is also a player. These part would need to be rework if you want to pass to dedicated server.

Also, just a little warning, it's not possible to "get BP" without get C++ first. If you can't understand C++, you don't understand really BP (which are just graphic C++). In particular on MP games, it's impossible to really understand what happen behind the nodes to avoid to make big mistake or not-optimised code.

[thin stratus]

You'd need to code with both in mind

[graceful flame]

While you’re developing the game you use PIE client mode to test with so you don’t have to actually rent and setup a dedicated server but it’s using the same architecture.

[thin stratus]

In DediServer only models, you'd never play visuals effects and sounds for anything but clients.

For ListenServer you'd do it for everyone

If you target both, even if just during dev time, you'd need to handle both cases

So that it plays them if ListenServer but not if Dedi

That might go for more than just this example

Rest depends on how your game would match make

DediServer matchmaking of course works heavily different and requires a backend

(also super €€€€)

Competitive Games with small teams (or even as solo dev) are a really really bad idea

[ancient moth]

Any idea for this problem ? A least some hints... 😅

[quartz iris]

For the winner of a round between 2 players, should I put the winner's controller into a variable so I can keep track of who's won what round?

[low helm]

Player state is more appropriate

Because all clients have access to each other's player state

[quartz iris]

I'm still kinda confused on how I can display the winner within a widget

[low helm]

You need an object that's replicated to everyone, the game State object would be the most common to use for this purpose

Do you have a custom game state

[quartz iris]

I have this in gamestatebase

Yeah

[low helm]

I don't think you're supposed to use get player character like that, clients cannot read that properly

[quartz iris]

I understand how to use gamemodes/states im just not sure about displaying the winner/loser in a widget and the opposite players health inside a widget too

[low helm]

But it's good you have a game state

Have the server save as a variable either the character or the player state of the previous winner

A replicated variable on the game state, and that is what your widget will read

[quasi tide]

Game state cycles through all Player Controllers and calls a ClientRPC that will cause the widget to show up.

[low helm]

Seems a lot simpler to just do a multicast on the game state

[quasi tide]

You can, sure. I just prefer to do my UI handling stuff through my player controller.

[quartz iris]

Like this?

Its not a multicast atm but i'll change it

[low helm]

Lol, yeah sort of like that

But don't create a different event for each player, that's silly

[quartz iris]

So I need to loop each controller?

[low helm]

Just put an integer parameter on that event

No

Ignore that for now

[low helm]

Perfect

Now your widget and your other logic can just read that integer

Go into your winning widget and add an integer variable which is exposed on spawn and instance editable

[quartz iris]

Winning widget meaning the widget showing up for the winning player?

[low helm]

Yeah

[quartz iris]

Okie

Shouldn't I be looping the characters though?

[low helm]

You have to give a little more background on what that ticklogic is doing

But it definitely looks irresponsible

[quartz iris]

Checking for each players health

[low helm]

That is the server checking to see who's dead?

[quartz iris]

I will probably change it to a call

Yeah

[low helm]

Okay, technically that should work but it's still a strange approach, typically you would just put that logic on the characters themselves whenever they receive damage

[quartz iris]

Yeah

[low helm]

Also, you would need to make sure that the clients were not running that ticklogic

[quartz iris]

But for now im testing its ok

Isn't getting the local player char not going to work though?

[low helm]

Not sure what you mean

[quartz iris]

I need for this to check through each player in the lobby to see if they are dead and if they are give the other player a win

Would I need to keep the variables for Player 1 and Player 2 wins?

[low helm]

That is clumsy

But for a two-player game it would be acceptable

[quartz iris]

How do I do this properly? I'm not doing it right

[low helm]

Better approaches would be to save an array of victories, or to set an integer for victories on each player state

For instance, you could have one array on your game state which is an array of player States, every time someone wins add their player state to the array

Then you can write a function to output who has won how many times, and you would even retain the order in which they had won

So it would look kind of like this

1,1,2,1,2,1,2,1,2,2,2

Except instead of numbers it would be player State references

[quartz iris]

I think I need a good youtube tutorial or something lol

[low helm]

I'm sorry I'm overwhelming you

Just keep chipping at it and send me pictures of your code in DM if you have more trouble so we don't clog up this chat

You're on the right track

[quartz iris]

So wait so getting the player character 0 gets the first player who joined eg the server right?

[signal meteor]

Does anybody use AI in their Multiplayer games?

[low helm]

On server I think it should work that way, but on the clients it definitely will not

[low helm]

Yes people started doing that in the '90s

[quasi tide]

Nope. Not a soul.

AI can only be done in single player.

[signal meteor]

I meant like any of you in the server lol

for your games

[low helm]

Yes

[quartz iris]

Ok got it

I think

[graceful flame]

So I'm just walking around using the default character movement component while emulating a realistic amount of lag and the results are unplayable. The amount of jitter due to server corrections is awful. Not sure what I'm doing wrong here. Can't take more than two steps without it stuttering. I have changed default walk speed from 600 to 800 and don't change it during runtime.

Incoming: 15-80ms with 2% loss
Outgoing: 15-80ms with 2% loss

Actor tick: Tick enabled 0.0
Mesh tick: Tick enabled 0.033
CharacterMovement: Tick enabled 0.0
CapsuleComponent: Tick enabled 0.033

Net Update Frequency: 100
Replicates: Enabled
Replicate Movement: Enabled

[quartz iris]

So how can i get the other player's health etc

In the widget

The player you're fighting against

[low helm]

If you only need it at the end, just include those as parameters of your victory event

And the widget can read it the same way it read the integer

[quartz iris]

At the start

[low helm]

If you need to continuously, make it a replicated variable on the characters

[low helm]

At that speed, the character movement component shouldn't be giving you that much trouble though there are options to significantly turn down server correction

[graceful flame]

I need some guidance

[low helm]

What sounds more likely is it the player is actually colliding with something that he is carrying, perhaps on the client but not the server or the other way around

Are you sure it's the instantiation of mild lag that is causing this

[quartz iris]

Yeah but how do i get the right character ?

[graceful flame]

There are a few attached meshes, but I have collisions and visibility disabled until some event happens.

Yea if I disable lag emulation it all goes away

[low helm]

That depends on the widget that is displaying that information

[low helm]

Are you sure that event is happening on the client and server properly

[graceful flame]

It happens before that event even fires yea

[quartz iris]

Its the widget made when the player wins/loses

[low helm]

Well I suppose we could look at the character movement component and just find the server correction variables, look for variables and say error correction or location correction or something like that, I'm not on my computer right now

[low helm]

If the players know what player number they are, they could just read an array of health values

[quartz iris]

How do I get the name of the player from the character which is stored inside the Round 1 Winner character variable?

[quartz iris]

So I do NOT= local player

[low helm]

You would need to cast from get player character to whatever the actual class is, that should have your player name variable

These questions are coming a bit too fast I got to go for a while

[low helm]

That doesn't seem right

[quartz iris]

This would be the actual player's name right? like their steam name for example, as im using advanced sessions

[quartz iris]

Why not? There's only one other player in the server and so if it's NOT= to your player then it must be the other?

[low helm]

I don't know where steam advanced sessions puts player's names you'd have to ask someone else

[low helm]

I'm not exactly sure what you're trying to do there but yeah maybe you're right

[quartz iris]

I need every player to see the health of the enemy they're going against in their widget

[strange apex]

Hey, I added Create / Join Session. I have a pickup to inventory system which picks up actors/items BUT it only works on The Host Player, any other player connected cannot pickup the item [ in my case it shows inside the inventory that he picked the item up and I can even drop it but the item is still there ]

[low helm]

Well typically in a video game players would be able to see each other's health persistently, but you could do it a little different, you could do it to where at the victory screen the server just tells you the health of the player that did not die

[quartz iris]

No I don't think you know what I mean lol

All im asking is how do I get the information from the opposite player's character as a character

Specifically in a widget

[low helm]

You need to run an event on the server so that the server will delete that item

[strange apex]

so from PICKUP NODE --> custom event / which triggers delete actor?

[low helm]

Yeah

[sinful tree]

In the GameState there is the PlayerArray which is a list of playerstates. If you know for certain that there is only 2 players, then you can loop through the PlayerArray and check if the Owning Player of the Widget's PlayerState != Array Element then you have the other player's playerstate.

[low helm]

But yes, on any given character you can check to see if it is locally controlled and if it is not then it is belongs to someone else

[strange apex]

Doesn't seem to work, probably did it wrong.

[low helm]

Did you make it RUNonserver

[low helm]

Good

Is this event running on the object or on your character

[strange apex]

object , but rn i am making it run on character and it worked but also removed my player

[low helm]

It will probably fail if you run it on the object, because objects that you are not the net owner of are not eligible to send messages to the server

Yeah good run it on your player, you probably just accidentally have it destroying self instead of destroying the object it is supposed to point to

[strange apex]

idk why but when i create the event it makes it to delete the character , is it because i am running the event inside the Character BP?

Can't seem to fix it

Also another thing, When the host throws item from inventory they show up differently to the Client [ the cubes are the Items/Actors that you can pick up ]

[sonic python]

nope not working

like the weapon attaching to player is not seen .. and even the attack animation is not seen

[severe monolith]

Will this work as a method to pass a class to clients? (the onrep function will create the widget and add it). I had an issue where the healthbar didn't exist as object for users

[torpid girder]

i was just reading over the logs and found LogNet: ReplicationDriverClass is null! Not using ReplicationDriver.

is that something i should worry about?

[severe monolith]

didn't work, fuck

[graceful flame]

Repnotify isn't some switch that magically makes your weapon work properly, its the mechanism that you need to utilize in order to achieve the result you're looking for.

[torpid girder]

oh wow getting closer to why my characters fall through the floor when the first spawn in (at least the remote proxies do)

so if i run far away from the other player (i assume despawn) and run back (re-created some how) the character are both standing correctly

[regal ether]

Quick Question: Anyone here know how to replicate a set actor location? So basically I have 2 portals, and I want their position to be set by a gun that users have. Only issue is, I cant figure out how to set the location. Right now, the move portal event is called with remote authority (so client), and is not replicated. This event calls a server event, which carries out the logic. However, this does not work in the level, as nothing is moved. Attached is an image of the logic

[dry pebble]

Does anyone know how to enable the Networking Plugin - specifically how to get the insights part to work? I enabled all 3 plugins and in "Launch Commands" added -trace=np but that didn't do anything. In his video he types trace=np in visual studio, how do you do this with rider? (also I know the plugin isn't worked on anymore, just trying to debug something) https://www.youtube.com/watch?v=_rdt-v1nFlY

[low helm]

What object is this event on? It needs to be on a character or playercontroller

[regal ether]

the event is in the portal

[low helm]

You cant put replicated events on objects that you are not the NetOwner of

[regal ether]

and its called here

in the player

[low helm]

doesn't matter, the event needs to be on the player character

[regal ether]

but I cant do that

[low helm]

you can

[regal ether]

is there any way I can set its location in the portal?

the location isnt the only thing being set

[low helm]

You just need a passthrough

on the character

[regal ether]

what does that mean

[low helm]

create an event on the character which is replicated

and runs this event, non-replicated, on the server

so create an event on the character which has a reference to a Portal, and the Hit paramter also

[regal ether]

ok thanks

[graceful flame]

If you use the default character movement component and these network emulation settings do you get lots of server corrections too? I can't seem to figure out why moving around with just this amount of lag becomes unplayable.

p.NetShowCorrections 1

Actor tick: Enabled with rate 0.0
Mesh tick: Enabled with rate 0.033
CharacterMovement: Enabled with rate 0.0
CapsuleComponent: Enabled with rate 0.033

Net Update Frequency: 100
Replicates: Enabled
Replicate Movement: Enabled
Netupdate Frequency: 100 (default)

[severe monolith]

well you are just telling it to destroy the actor (self). And itself is the character

[low helm]

I have a general architecture question. The further ones stutter more under strain and I'm curious which system is doing this.

Moving 600 of these around on .1 second tick on server, client receives through Smooth Sync (replicates movement off). What is prioritizing the close ones?

[severe monolith]

Chances are you are telling your server and client different move speeds, and when your client tries to move, it does it at a wrong speed. (Or the client is completely unable to move on itself, and relies on the server for all moving)

[graceful flame]

But its using the default movement, so it should already be using client prediction and all that good stuff

[severe monolith]

have you modified the move speed in any way?

[graceful flame]

I'm not changing the speed on runtime or anything like that, its set on the character class default to be 800 instead of the default 600 thats it.

[severe monolith]

hmm

does it run fine on 600?

[graceful flame]

No same corrections, just moving slower overall

[severe monolith]

hm alright

i mean you have given it a 160 ping

it is pretty unplayable

[graceful flame]

Even using the average settings of min 30, max 60, loss 1 its correcting so much the screen is blue with debug capsules

just strafing back and forth left to right, forwards and backwards a few steps

[low helm]

it has to be a speed difference or there's some collision happening you don't realize

Try posting a video of the hiccups, or try deleting and remaking the charactermovementcomponent

[latent heart]

Just for a moment I thought you were being super facetious and telling him to re-write the entire component from scratch 😄

[graceful flame]

Well I have another character that uses a modified CMC with the same issue lol...

But they both use the same parent which is default CMC which has prediction stuff built in

The AI characters are moving around fine which I suppose is normal

[low helm]

so you've modified the CMC that's causing hiccups? HMMMM

[quasi tide]

To be fair - no small amount of people have issues with the CMC and server correction on fairly average connections.

[graceful flame]

There's two characters one with the normal character movement component and another character (Im not even testing with at the moment) that extends the character movement component to add some stuff

[low helm]

a normal CMC with 160 ping should be perfectly smooth, unless you broke something or there are invisible things in the world you're colliding with on the server

[graceful flame]

Its an empty flat land with some ramps and cubes scattered around

not even walking into those

[kindred widget]

@graceful flame What speeds are you moving at? Also what framerates. I found even upping default speed to about 900 and running at 15fps was practically impossible to move 30 fps was still kind of annoying. I had to up the Network Update Distances quite a bit.

[graceful flame]

Around the same speed, what did you set the distances to?

Is this the Network Max Smooth Update Distance and the Network No Smooth Update Distance?

Similar FPS too

[kindred widget]

Yeah. I generally try to keep them a little over max speed. Needs more or less depending on acceleration.

[strange apex]

i know but i cannot change to the Item actor

[graceful flame]

With one slightly more than the other?

I see default is min smooth distance: 256cm and no smooth distance: 384cm

[kindred widget]

Yeah. That's assuming 600 max move speed with default acceleration. Just mess with them a little. Basically you want to let the server catch up to the client's intentions without correcting it too harshly. The overcorrection at lower FPS is what causes the movement issues. Client trying to move too far per frame.

[graceful flame]

Okay

Also is this a value you change dynamically during runtime based on some other value or event?

[kindred widget]

Not sure on that. Haven't tried or looked it up. Just happened across that on a test project a month or so ago. 😄 Wouldn't have been an issue except I was trying to superspeed to debug some stuff and client just wouldn't move.

[sonic python]

Actually I know but still thanks man , and now should I do the same thing for my attack logic as it also is not working for the client

[graceful flame]

Are you using Apply Damage?

[sonic python]

Yes

[graceful flame]

and Event Any Damage on the actor being damaged?

[woven basin]

This video is the best by far for how it make movement speed changes and handle lag up to 500ms https://youtu.be/RtQRMcupJs0

[dry pebble]

yes and delgoodie's tutorials too

[graceful flame]

Yea this is for extending the movement component to do stuff like dashing, wall running ... etc. I have another character that does this, but its not the problem. The problem is with just vanilla walking around and strafing back around suddenly and quick turns.

[abstract sundial]

In Rider, there are 2 options:

• add program arguments to the Run Configuration (drop down with the name of your project on the toolbar > Edit Configurations)
• install EzArgs plugin (it'll add a similar text edit field to the toolbar as in your example)

[graceful flame]

I guess it's just gonna be more trial and error with different values for these:

[woven basin]

Oh wow. Just looking at those now. Looks amazing. Thanks.

[low helm]

under normal conditions, replication is only passed from the server to the client

you could send your position to the server with events and all

but the sexier way to do it is download smoothsync and it will handle it all by itself

it's a plugin that allows the netowner of an actor to just directly SETACTORLOCATION and smoothsync sends that info the the server and smooths it out on all other clients

[dim trail]

is there a way of getting the current path of a controller on the server?

[dim trail]

doesnt work

[dry pebble]

thank you, will take a look

[sonic python]

Yes

[dim trail]

can you not clear timer handles on the server?

[prisma pelican]

is it possible to disable client side protection in blueprints?

[sonic python]

This is my pick up codes in character bp

This is an example of pick up with sword in my sword bp

[sinful tree]

You need to stop using RPCs for everything, especially multicasts for changing values for others.
Anything stateful should be done through variables. Selecting/Equipping a weapon is something stateful, so there should likely be a replicated variable that you use with an OnRep -> The OnRep function fires when the value changes, so you use the OnRep function to perform whatever action you need with the new value.
It's also a very bad idea to use "Get Player Character/Controller/Pawn" with the index in multiplayer - you don't know which is actually the one you want to use.

You use multicasts when you have something that is "fire and forget" like a notification that needs to pop up on screen, a sound playing, some visual effect to play.

RPC usefulness is also tied to the owning client of the actor. If you have a weapon on the ground, it's unlikely that any specific client owns it, so you cannot:
A) Cannot Call a Client -> Server RPC that exists within the actor.
B) Cannot Call a Server -> Client RPC that exists within the actor.

All you can do to communicate with a replicated actor that is not owned is:
A) Multicast, but only when you know you're running on the server.
B) Set replicated variables, and if you want them to replicate to all clients, you need to be running on the server.

A typical replicated pickup action would go:
Client Side: Press "E" on Character > Determine if something is within range that can be interacted with > If Found RPC to Server with a reference to the actor.

Server Side: RPC received > Check if passed through actor can be interacted with (check if it's a valid actor, if it's within range, if the player can interact with it) > Call "interact" interface on actor, preferably passing through a reference to the character or controller that was performing the interaction.

STILL Server Side (Item Interface): Validate if the specific interaction this actor performs can be completed with reference to the character/controller > Perform whatever is required to complete the interaction on the server, setting any variables that need to be set, preferably OnReps for anything stateful. As you're still running on the server, Multicast any sound/visual effects if necessary and destroy the actor if you want it to disappear.

Client Side (OnReps received): Do whatever you need to do with the new values in their OnRep functions.

[sinful tree]

If they were created on the server then you should be able to clear them.

[sinful tree]

I haven't heard of client side protections myself. Do you maybe mean client side corrections where the player is moved by the server if they're in a spot the server doesn't think they should be?

[sonic python]

So you mean , that I have to do things in the sword bp here?

Like What Should I do ?

I'm confused

[sonic python]

Should I create Boolean rep notify and add the logic for the sword in it and use it?

[sonic python]

Attach ,detach

[rocky night]

Anyone know how to show the actual player in the match on the hud?

i know how to get the steam name and display it but not how to show it froma ll on the hud (max 4 )

[round mist]

You're just trying to list connected players in your HUD?

I think the game state has a list of all the players connected? Or you can use Steam's API to do that. Can't remember off the top of my head.

Then you'd just create a widget to display them in a vertical box. Right? I must be missing something.

[rocky night]

yea just that actually

[torpid girder]

hello, other than editing the DefaultEngine.ini can i set the replication graph class in PIE?

[visual urchin]

Hey, I've got a question. Right now the only way I found to make a server call from client is by calling an event written in the player character blueprint. I'd like to know if it's possible to have a GameManager blueprint in the map that contains all events that can be called by clients. I understand that if client doesn't own the object, it cannot send a server call, but I don't think it's a good idea to have all the events in the same blueprint.

[latent heart]

Server calls can only be made on player-owned actors, such as player controller, player state and their pawns.

Having a random actor not owned by the calling player won't help.

[visual urchin]

Well, shit happens.

[latent heart]

You can abstract the calls you need to make.

E.g. find a common way for all calls to be routed through the same Server RPC

[visual urchin]

I'll create a component for the player character that can deal with all this.

Hope it works.

Thanks for the help!

[latent heart]

Np.

[amber saffron]

hi again, feel like im almost getting it to work correctly. here is my flow:
1.) Player A has variables that are dynamically set ( a cockpit skeletal mesh, and a mech build array)
2.) Player A creates a listen server
3.) in the created listen server map an actor bp(mech platform) has an empty skeletal mesh component. on event begin play mech platform pulls the cockpit mesh variable from Player A and sets it to its skeletal mesh component via repnotify. it then pulls the mech build array variable from Player A and spawns parts in the map
4.) mech platform then assembles the parts via another repnotify. up to here it works for server player
5.) client B joins the map
6.) Client B only sees the spawned parts and it attempts to assemble them, but it does not see the cockpit skeletal mesh

where do i correctly store the the variables for player A so that they can be properly used by mech platform to be replicated to Client B?

i currently have the variables stored in the player state and access them in the mech platform bp like this

and here is the repnotify for the cockpit skeletal mesh

[prisma snow]

Mmm I'm getting a weird crash: I'm spawning an in the server with the following code, on BeginPlay:

if (GetNetMode() != NM_Client)
    {
        HelperActor = GetWorld()->SpawnActor<AHelperActor>(AHelperActor::StaticClass());
    }

The actor itself is set to replicate:

AHelperActor::AHelperActor()
{
    PrimaryActorTick.bCanEverTick = false;
    bReplicates = true;
    bAlwaysRelevant = true;
}

When I call a function from him on the client, everything goes well until we hit the following line:

if (GetNetMode() == NM_Client) {}

The call stack after the GetNetMode() function is called is:

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x0000000000000008

UnrealEditor_Engine!AActor::GetWorld() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\Actor.cpp:556]
UnrealEditor_Engine!AActor::InternalGetNetMode() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\Actor.cpp:4668]

[sonic python]

Hey My Weapon still is not replicating

Can anybody show something so that I know how to do it?

[quasi tide]

Hey @chrome bay - how does HLL handle this kind of situation? If you are able to share.

[chrome bay]

Ammo is replicated as a struct with some other params. We only take the Servers' most recently replicated value if the "reload counter" increases - if it doesn't, we keep the clients' local value.

[quasi tide]

Alright - so, my proposed solution isn't too out of left field. Thanks!

[chrome bay]

Yeah same idea, we know ammo will only ever go up if a reload was completed on server - so that's the only time we accept the servers' rep update

We send different calls if the client tries to fire and it gets rejected. Low-key prediction/reconcile essentially.

[quasi tide]

Yeah, inside my onrep now checks if it was a reload (pretty much if the ammo equals the magazine size) and if it wasn't, then checks if we should keep the client one. It also handles the situation where a client tries to say they have more than what the server thinks (outside of the reload situation). Simple script kiddie deterrent 😅

[twilit radish]

HLL competitor incoming 👀

[quasi tide]

Definitely not

I have no interest in pvp

Really sets me free to allow more client stuff 😅

Oh - you shot every enemy on the map after spawning? Strange - but okay!

[twilit radish]

🙂

[chrome bay]

If i've learned anything this week alone it's that people will always find a way..

Can't even wrap my head around the latest hacks I've seen 😄

[twilit radish]

If only people would just be nice 🥲

[prisma snow]

Solved it, for some reason I could call a function on a NULL object and only crashed a few stack frames later

[twilit radish]

But yeah.. Unless you have a game that happens to have no design issues it's just a never ending game.

[quasi tide]

Just to clarify - this was null?

[prisma snow]

YES lol

but I could call functions on it

[quasi tide]

Go home computer. You're drunk.

[prisma snow]

yeah very weird

if you call a function to another class that is replicated and is your UPROPERTY(), you still have to mark your pointer to that class as replicated right?

[chrome bay]

not neccesarily

You can have a non-replicated UPROP pointer to a replicated object

E.g, PlayerArray in Game State

The array is constructed locally

[prisma snow]

Mmm mine was null for sure, not sure if that is the cause

[chrome bay]

Well ofc the client would have to populate that pointer somehow

[prisma snow]

ahh then yeah that's the problem

[chrome bay]

But replicating the object itself != replicating a pointer to it

[prisma snow]

exactly, that was my reasoning error then

[twilit radish]

I'm looking at what random cheats HLL has on YT and I see this gold of a comment:

and the unwillingness of the Hell let Loose Dev team or team17 to encrypt their files is the problem here!

[quasi tide]

https://tenor.com/onfj.gif

[twilit radish]

Just encrypt the files, Jambax! 😂

[quasi tide]

Jambax probably 👆

[chrome bay]

If only I didn't have to hide behind PR

[twilit radish]

I do always find this topic a shame though. Imagine if the people who made cheats just used those skills for something good or something else 🥲

[quasi tide]

For some - it is just a game of cat & mouse

[gentle oracle]

Planning on upgrading my ue5 to ue5.1, does anyone know for sure if they added the adjustment to world partition with listen servers? Where everyone just loads around them rather than the server having everything loaded

[molten matrix]

Has anyone seen this error before: Socket->SendTo failed with error 21 (SE_EADDRNOTAVAIL). It's happening when I try to call ClientTravel on my local address. I'm using the Null online subsystem.

Here are the prior logs:

LogNet: Browse: 192.168.1.225:0/Game/Maps/Entry_CruiserCommand
LogInit: BSD IPv4/6: Socket queue. Rx: 32768 (config 32768) Tx: 32768 (config 32768)
LogNet: Created socket for bind address: 0.0.0.0:0
LogNet: IpConnection_0 setting maximum channels to: 32767
PacketHandlerLog: Loaded PacketHandler component: Engine.EngineHandlerComponentFactory (StatelessConnectHandlerComponent)
LogHandshake: Stateless Handshake: NetDriverDefinition 'GameNetDriver' CachedClientID: 4
LogNet: Game client on port 0, rate 100000
LogNetVersion: CruiserCommand 1.0.0.0, NetCL: 0, EngineNetVer: 30, GameNetVer: 0 (Checksum: 1063194264)
LogNet: UIpConnection::HandleSocketSendResult: Socket->SendTo failed with error 21 (SE_EADDRNOTAVAIL). [UNetConnection] RemoteAddr: 192.168.1.225:0, Name: IpConnection_0, Driver: PendingNetDriver IpNetDriver_0, IsServer: NO, PC: NULL, Owner: NULL, UniqueId: INVALID Connection beginning close timeout (Timeout = 165133876).

[prisma snow]

Is it worth to have a replicated property that is never going to change, just needs a dynamic initial value?

I'm thinking about the pointer issue I had before

[twilit radish]

In at least C++ you can set it to be "Initial only" so it only replicates the very first time for clients but does adjust dynamically when new people join (assuming you updated the variable).

[molten matrix]

I figured it out. My call to ServerTravel was missing ?listen at the end.

[prisma snow]

wow that is exactly what I need

so if it is a pointer to an actor, which is initially nullptr but soon gets assigned, I can use that?

[twilit radish]

Not sure if you want to use it then, it won't update unless you rejoin. Unless that's what you want 😄

[quasi tide]

Yeah - I use the InitialOnly condition quite often. To set the value on the server and prevent simple script kiddies

[prisma snow]

the problem is that the value is not set on construct, but on begin play iirc

I don't think I can spawn the actor on constructor

[twilit radish]

I'm not exactly sure at what point the initial variables get send honestly 🤔

[quasi tide]

Probably capture it in PostNetReceive (or something like that)

[prisma snow]

the best way could be to just RPC it but then I have to send manually to new joiners

[quasi tide]

James probably knows off the top of his head though 😅

[winter ridge]

Hello, I'm having a issue with local multiplayer. When I'm creating local players they don't return valid player controllers except only for one local player.. I have "spawn player controllers" ticked on the node too. I've also checked the amount of player controllers that exist in the world after creating 4 local players and only get one. Anyone have any ideas why? (this is 5.1 in bp by the way)

[sonic python]

?

I will understand it now for sure...

[young spoke]

is there a reason in UE5.1, on third person template, when i enable "Play as Client" , it seems like PlayerController does not possess the character

so clicking around, moving around, nothing happens

[mild socket]

Hey, did you get to solve this? Are you using the base template and it doesnt work?

[young spoke]

i didn't solve it... moved on

[mild socket]

Rip. Gave up?

[prisma snow]

Is the third person shooter multiplayer ready to begin with?

I remember that the top-down template wasn't

[young spoke]

yep, it's probably a random setting that is botched on my editor somewhere

same happens for TopDown

nbd

[mild socket]

It might not be multiplayer ready. I did see tutorials about implementing stuff like shooting and actor look direction in the first person, but third person should be multiplayer ready on a basic level, like movment is replicated from the get go as of ue4,

Have you tried verifying the launcher in the library? And making a completely new project to test?

[young spoke]

it's just a configuration issue

[mild socket]

Maybe yeah

[young spoke]

I use CMC and other net objects fine in my game on 5.1.. it's just the template thats acting funny

and i didn't feel like digging in

[sonic python]

heyy one more thing as i have done my damge logic with event apply damage theres no need for RPCs in the damage part for a weapon right

[dark edge]

Depends on what kind of setup you're going for

[sonic python]

depends?

[dark edge]

Somewhere between the player pressing the button and the thing happening, there has to be an RPC to the server. The results of the thing happening have to get back to the client and to other clients somehow, either replicated data or RPCs, depending.

[sonic python]

variable for the amount of damage and booleans can be replicated for that?

but theres a chance that RPCs is not needed right?

[dark edge]

At a bare minimum, that is, the new health being correct after damage, that'll work.

You might want a multicast or whatever for the cosmetics like damage popups or such

Really all depends

[sonic python]

ah no I just want a player to damage another player

and another thing

[proud gust]

Atm im trying to do the following and i need some help, I try to keep it short ^^
I have 2 Dedicated Server with different IP(two different machines). When the Player starts the Game, the LogIn screen appear and the User can login, the Server checks if the username/Password is correct.(Its all stored in a MysqlDatabase).
After this the user connects to Server 1 and can play on it.

When the Player now wants to change to Server 2, he gets disconnected from Server 1 and Connects to Server 2.
But atm the Player needs to Login again with Username/Password, that way Server 2 knows which Player is logging in.

How can i automat this, so that the Player dont need to Login again?

I want that Server 2 knows, that this player was allready logged in(on Server 1) and that he dont need to enter Username/password again.

I was thinking to send the IP-Adress from the Player from Server 1 to Server 2(Maybe over a WebSocket) and if the Player Connects to Server 2 and Server 2 has that IP-Adress from the Player allready,
he loggs in the Player Automaticly, but i'm not sure if this is the correct way(i dont want to make huge security mistakes)

[sonic python]

the weapon being attached to player of a client is not visible to the player

how to fix that

for the server everything works fine and perfect

[dark edge]

the weapon actor should be replicated, with replicate movement turned on. Just attach it on the server and it should attach everywhere

afaik. It's been a while since I've touched that stuff

[sonic python]

movement of the player is replicated

do you wanna see my codes?

only if you wanna

ah what happen

Sorry anyone can help if you want

ill send my codes

in character bp

[dark edge]

Do you want the client to tell the server what they want to pick up or to just tell the server they pressed the pickup button and the server decides everything from there on out?

I'd recommend the latter.
Input -> Run on Server Event
Run on Server Event -> Choose what to pick up -> Pick it up

That'd be the safer option but less snappy, you can also

Input -> Choose what to pick up -> Run on Server Event with a paramter telling server what you want to pickup
Run on Server Event -> Do the actual pickup

[sonic python]

Mmm second one

[dark edge]

So do it. Right now you're doing nothing multiplayer in your pickup mechanics

[sonic python]

tell the server they pressed the pickup

[dark edge]

K so just add a run on server event between the input and the get overlapping actors

[sonic python]

okay

ill test it

[dark edge]

Remember that input is only local, your current code will only do stuff on the LOCAL machine where the event is happening. That's why it works on host but not client. The host doesn't know about the client picking anything up because you aren't telling it.

[sonic python]

i tested it now

and now when the client presses pickup

the weapon gets attached to the server player

whats happening now?

how to fix this?

[dark edge]

Show your pickup code. I bet you're attaching to Player 0's pawn, that's a nono

where you do the actual attachment

I can already tell your pickup interface isn't enough, the weapon doesn't know WHO is picking it up

and generally I wouldn't put pickup stuff in the interface, the thing that's doing the action should do the mechanics

that is, the character should pick up and attach the weapon, the weapon should not attach itself to the character

[sonic python]

I have different items using the same pick up function

[dark edge]

That's fine, but put that function in the character

not in the item

[sonic python]

Ill show you my pickup code in the sword

[sonic python]

character?

[dark edge]

You can do it either way but you need to pass over a reference to the character/pawn that's doing the pickup

just show your code

[sonic python]

oh in a min

i created the pickup function in it

this is a pickup logic in sword

[dark edge]

That there's your problem

[sonic python]

oh

what should i do?

[dark edge]

pass over the character reference in the interface

so it know's WHO is picking it up

That'll fix it, but I'd put the pickup mechanics inside the actual character and not on the items.

[sonic python]

?

[dark edge]

Add a parameter to your interface of type Character Actor reference

[sonic python]

a error is coming

I added a parameter

oh wait a minuteeeee

it works nowwwwwwwwwwwwwwwwwwwwwwww

Thank youuuu Adriel

oh there comes another prob

now the player aint taking his sword out

sorry for being stressful..

[severe monolith]

Hello, my multiplayer server travel works fine when playing in editor or playing standalone, but when i package the game, i can't use the server travel, simply nothing happens when i click my start game button

This command

again, no problems in PIE

[sonic python]

okaynow fixed that problem

back to phase 1

the damage aint working

[dark edge]

You probably have a TON of stuff in your project that wasn't set up correctly for multiplayer. Just go bit by bit and make sure it makes sense

make sure you understand the difference between the server, client, local, etc

[sonic python]

quiet hard

ill go through it but

can you or someone help in this alone?

let me show my attack codes

in charac bp

[thin stratus]

Check your Logs fwiw. It might be failing to travel to the level? Maybe packaging problems.

[sonic python]

Okay Found Out the prob and fixed

Thanks for the help adriel

[severe monolith]

How to check logs on a packaged game?

[thin stratus]

A packaged game still has a Saved/Logs folder

[severe monolith]

Looks like im not at fault here, someone else has exactly same problem. command is apparently broken on packaged builds. Hmm

[thin stratus]

Are you using Steam as a subsystem?

Or just null?

[severe monolith]

tried both

neither worked

but now i got steam setup :)

[thin stratus]

Steam requires Seamless Travel

The post you linked is talking about non-Seamless Server Travel

You can't use that with Steam

And in general, if not explicitely needed for your game, you should always use Seamless ServerTravel

[severe monolith]

hmmm

Alright

interesting

[thin stratus]

If you non-seamless ServerTravel when using Steam it will cause your Clients to fail the reconnect

[severe monolith]

But not even the server travels atm, is that intentional?

[thin stratus]

No, but the post you linked doesn't metion that problem either

[severe monolith]

hm

[thin stratus]

So this might be an issue that you specifically have

Again, check your logfiles

[severe monolith]

i will, thanks

[sonic python]

Hey is there any tutorials related in app purchases, how to set the money? After setting the game currency in game

[dusk night]

At what point can a client receive RPC's? I'm sending an RPC from server->client as soon as the GameMode match starts(which happens as soon as NumPlayers > 1), but they do not receive it unless I delay sending it via a timer.

[signal meteor]

are there buffered rpcs in unreal? if there is you may want to look into it. Buffered RPC ensures that all new joins receive the request so no synching or timing is needed.

[thin stratus]

Usually as soon as their connection is fully setup

There are some events that are more precise but one event you can use is PostLogin

[fiery wadi]

I am new to multiplayer and am trying to get a grasp of how each replication function works etc. I figured I would try a simple "Show client UI upon starting game". Ofc this doesnt work. XD

If I am undestanding correctly the Game Mode is the server logic which can then tell the client what to do or send info to the client(playercontroller) ?

this is my attempt to show 2 buttons to 2 clients using the 2 players and ListenServer model from the PIE but as you can see no UI shows.

So for something like this would I have to put the code into the Player Controller and then the Server would tell the Client to run this code or would the Server send it to the client ?

[kindred widget]

AHUD is not a replicated class, so you cannot replicate or RPC through it.

And generally speaking I would advise not showing UI directly like that. Generally you set some state on a client and that state change triggers a UI display.

For example a user initiates a vote to kick a player. They tell server this, server sets something like a replicated struct and it's OnRep decides if UI needs to be shown based on the information in the struct.

Another example might be a countdown to start the game, or an important timer. You replicate some state and let the client handle it locally.

For something as simple as displaying UI at the start of the game, you should just use AHUD's Beginplay. The server shouldn't dictate when the client gets UI, the client should based on it's local state.

[fiery wadi]

Ahh thank you for that information, I was following some tutorials but i started to feel like i wasn't learning just basially copy and pasting so felt the need to try and get my hands dirty with this and then ofc you run into issues with the tutorial's and you have no idea how to fix them because you do not really understand what you have written/coded and you just hit a wall.

[kindred widget]

The only kind of UI I could see being put on screen directly from an RPC is quick temporary displays like a notification of the game's current state that then just fades out on it's own. Or stuff like chat where you don't really want to replicate it and just need a quick burst send.

[fiery wadi]

ah like a tab score sheet screen much like in COD and various other games

where the server would have all the information regarding match state 5 Kills, 2 Deaths, 3 Assists etc..

[kindred widget]

Nah. Even that I would let client display on it's own. All of that state should be replicated to client through like PlayerStates or whatever. They should be able to bring that up at will.

[fiery wadi]

This is what i though might be a "tiny" multiplayer thing to do, Host Game(Create Session), Join Game (Find Session and Join) and then each player has an input Player 1 hits 1 to damage player 2 and player 2 hits the 2 key to damage player 1 and update HP accordingly, would you say this is a small enough project for a beginner?

[dark edge]

Nah tab spawns a widget which fetches the data from GameState and PlayerStates

[fiery wadi]

Oh i thought it queried the data from the server then spawned the widget, but seems it has already kept that data upto date so it's ready for the widget.

[dark edge]

Could be either but the UI doesn't talk over the network

UI should just display data that lives elsewhere

[fiery wadi]

Ah ok I,ll try to fmble my way through some of this as i feel copy and pasting from tutorials that usually end up getting stuck and such like and then having to start again and i could have wasted over a week on it seems like a waste of time.

so time to try to understand! 🙂

[dark edge]

Tutorials suck, just try to do the thing and look up specifics if you get stuck.

[fiery wadi]

indeed.

[dry pebble]

Does anyone know how to handle a custom movement mode and animations in multiplayer? E.g I have a custom mode for sliding. How best to update the animation blueprint? This is the current Blueprint ThreadSafe Update function but it sometimes updates the other player and sometimes doesn't.

[elder sable]

Get the id of your custom movement mode ( stored in uint8 CustomMovementMode;)

[rancid monolith]

How can I differentiate between APlayerControllers on client vs server? I need something like IsLocallyControlled, but that's just on APawn

[elder sable]

You can check the net role

[rancid monolith]

I know I could check if netrole = autonomous proxy, but for someone on a listen server, its authority instead, when IsLocallyControlled would return true

[elder sable]

netmode, localrole, remoterole

[rancid monolith]

ah, didn't know about remote role

I'll check that out

[fossil spoke]

IsLocalPlayerController

IsLocalController

[rancid monolith]

literally just found that the second before you posted lol

[fossil spoke]

Keep in mind, if this is a Listen Server, that will return true for the Host.

[rancid monolith]

exactly what I was looking for 👌

ty

is OnPossess only invoked for controllers on the server?

[elder sable]

Yes it's server side

You have ackknowledgepossion and another one for client, don't remember exactly the name

[dry pebble]

How do I get the ID in blueprints? I have access to the movement mode, but not sure how to get the id now. The ID is in my custom CMC

UENUM(BlueprintType)
enum ECustomMovementMode
{
    CMOVE_Slide UMETA(DisplayName = "Slide"),
};```

[rancid monolith]

could just do a getter function?

[dry pebble]

I tried, didn't work. Sometimes clients see the sldie, soemtimes they don't

[pastel fiber]

When I press W for example, the event handler for it only runs on the client that owns the character.

[dry pebble]

nvm I fixed it, had to make sure I went from walking/idle to slide as well as crouch to slide because for 1 frame you got from sprinting to crouching to slide and sometimes i think the packet for iscrouching to be true may be dropped.

[tough light]

I have a bug and hoping you guys might see some error that I cant see.

So I'm respawning player in game mode :

    //Destroy old Character model after X amount of seconds
    OldChar->Rename(*(OldChar->GetName()+"'s Dead Body"));
    OldChar->SetLifeSpan(3.f);
    
    //Respawns Player @ Random Starting Location
    AController* Spawning = OldChar->GetController();
    Spawning->UnPossess();
    FTransform PlayerStart = FindPlayerStart(Spawning,"None")->GetTransform();
    APawn* P = SpawnDefaultPawnAtTransform(Spawning,PlayerStart);
    Spawning->ClientSetRotation(PlayerStart.Rotator(),false);
    Spawning->Possess(P);

and a function to see if the player is local here

    //Get Net Mode
    const ENetMode NetMode = GetNetMode();
 
    if (NetMode == NM_Standalone)
    {
        // Not networked.
        return true;
    }
     
    if (NetMode == NM_Client && GetLocalRole() == ROLE_AutonomousProxy)
    {
        // Networked client in control.
        return true;
    }
 
    if (GetRemoteRole() == ROLE_AutonomousProxy && GetLocalRole() == ROLE_Authority)
    {
        // Local authority in control.
        return true;
    }
 
    return false;

It works for first time spawning but does not work for respawning / calling this function

[lucid viper]

Hello,
Currently implemented a sprint system, you can sprint foward diagonal but not left, right or backwards. I used a blenspace for the forward and diagonal sprinting animation. Everything works locally. Was able replicate the walk/sprint speed but noticed the sprint animation dosen’t follow. Would anyone have any tips on how to replicate sprinting animation in this case?

I was looking into blendspace replication, seems complex but not sure if its the correct way to implement this for multiplayer.
Im wondering if it would be easier or could I get away with just hooking it up to an anim montage instead

[fresh cloud]

so, quick knowledge question

on character movement component for simulated proxies, it depends on the ReplicatedMotion actor structure to get changed on the server after receiving a servermove from the autonomous proxy, then that goes to clients that have the character as a sim proxy, and then it takes that replicatedmotion data and applies it/smooths it?

[iron crest]

Hello, I have a question, Im trying to replicate a sword being spawned and attached to my players back if he presses the interact key which is handled through an interface, the problem is, I have no clue how to replicate a blueprint interface, its only showing up on the client. Does anyone have an idea on how to fix this

[lucid viper]

OMG im am idiot lol So I miss understood the issue here. I tought you needed to manually replicate the animations un your blueprint in your C++
I was scratching my head on why my blendspace set in my anim blueprint wasnt firing off
Turns out I forgor to replicate the variable over to the server correctly ... not my blend space is working perfectly 😄

[weak linden]

You don't need to replicate an interface, you just need to ensure you're making your interface calls in the correct locality, typically, for picking up/spawning items on interact, the flow would be like this:

Player locally presses interact -> call a server RPC with the interactable object as a parameter -> Server calls the interface function within the usable object -> interactable object does whatever it needs to do, spawn item, add to inventory, attach to player, yada yada, and it should automatically replicated to all/other clients (providing you have remember to check replicates in your spawned objects)

[iron crest]

hmm do you think you can elaborate, im not following, im lost, should the actual function inside the interface have a paramenter, and should it be input or output, because for some reason when I add the output as the actor to spawn, it doesnt allow me to make the event that the function is being called from?

[weak linden]

Bear with me one second and I'll get you a visual example

[iron crest]

ok thank you

[weak linden]

Here's a small little demo project I put together for someone the other day (you can open it In UE4.27 and up), it should give you an idea on how to send the interact request to the server, all the relevant blueprints are under ServerInteractDemo\Blueprints, you'll want to see BP_Character (in the Character folder), BP_UsableActor and then BP_LootChest (under Gameplay folder).

Feel free to ask any questions after you've checked it out.

[weak linden]

I hate to ask, but do you happen to have a code-based example of how you're doing your buffering and interpolation on the client you'd be willing to share? I've spent the last year trying different implementations of it and have a fairly good idea on 'how it works' but my execution has resulted in nothing but *mostly* undesirable visuals 😅

Would be more than happy to buy you a beer for a little helping hand.

[iron crest]

Hey sorry for the late response, it still doesnt seem to work, the sword doesnt spawn on the character anymore. Any cluewhy?

[weak linden]

Is your Sword blueprint marked as replicated? (not the mesh, just the actor blueprint)

[iron crest]

yep it is

[weak linden]

Can you show screenshot your blueprint/s for me to take a look at?

[iron crest]

Oh no, the actor wqsnt replicated, it works now lol, thank you

[weak linden]

Nice! Glad that's worked, has it solved the initial problem too?

[agile loom]

Why you didn't call the RestartPlayer()?

[tough light]

I have it just does not work.

[agile loom]

It may fail because of a null player start, when calling FindPlayerStart(), make sure the return is valid

[tough light]

is there a way to call RestartPlayer with my own spawn becuase my find player start function looks like this : FindPlayerStart(Spawning,"None");

[agile loom]

You can override the FindPlayerStart()

[tough light]

wouldnt it be better to override RestartPlayer function?

[agile loom]

Yes you can, but overriding the FindPlayerStart and returning a valid player start is easier

[tough light]

Just overrid the FindPlayerStart func:

AActor* UE4GameMode::FindPlayerStart_Implementation(AController* Player, const FString& IncomingName)
{
    return Super::FindPlayerStart_Implementation(Player, "None");
}

still not spawning

[weak linden]

Just an FYI, that does nothing extra than the default FindPlayerStart

[tough light]

it should have insteal of finding the player start using the Incomming name it changes it to "None" which are all my spawns

[weak linden]

If you were already calling FindPlayerStart like this FindPlayerStart(Spawning,"None");, it is actually just forcing the same thing, what actually is the error you're having?

[tough light]

I have it working kinda, my current function starts the spawn posess the character then finished spawning the character. For some reason, possess is not activating isLocallyControlled

    //Destroy old Character model after X ammount of seconds
    OldChar->Rename(*(OldChar->GetName()+"'s Dead Body"));
    OldChar->SetLifeSpan(25.f);
    
    //Get Controller And UnPossess / Let Go Of Old Char
    AController* Spawning = OldChar->GetController();
    Spawning->UnPossess();
    
    //Respawns Player @ Random Starting Location
    FTransform PlayerStart = FindPlayerStart(Spawning,"None")->GetTransform();
    ABRM6Character* NewChar = Cast<ABRM6Character>(UGameplayStatics::BeginDeferredActorSpawnFromClass(this,OldChar->GetClass(),PlayerStart,ESpawnActorCollisionHandlingMethod::AlwaysSpawn,this));

    //Check if new character is valid
    if(NewChar == nullptr) RespawnPlayer(OldChar);

    //Set Character Owning Player & Finish Spanwing
    Spawning->Possess(NewChar);
    NewChar->SetOwner(Spawning);
    UGameplayStatics::FinishSpawningActor(NewChar, PlayerStart);

[weak linden]

BTW, you probably shouldn't be using OldChar->Rename in that way, Rename is really used for changing the outer of an object, not for giving it a custom "name" like you are, also, where are you running your For some reason, possess is not activating isLocallyControlled code from?

[tough light]

ok for renaming I just dont want the new body to be named XXXNAME1 so I just rename it to the dead body

And I've had some issues for ListenServers testing my game where IsLocallyControlled does not work, so I've made my own isLocal function here:

bool AUE4Character::IsLocal() const
{
    //Get Net Mode
    const ENetMode NetMode = GetNetMode();
 
    if (NetMode == NM_Standalone)
    {
        // Not networked.
        //GEngine->AddOnScreenDebugMessage(-1,5,FColor::Orange,"Standalone Game");
        return true;
    }
     
    if (NetMode == NM_Client && GetLocalRole() == ROLE_AutonomousProxy)
    {
        // Networked client in control.
        //GEngine->AddOnScreenDebugMessage(-1,5,FColor::Orange,"Client & AutonomousProxy");
        return true;
    }
 
    if (GetRemoteRole() == ROLE_AutonomousProxy && GetLocalRole() == ROLE_Authority)
    {
        // Local authority in control.
        //GEngine->AddOnScreenDebugMessage(-1,5,FColor::Orange,"Listen Server Authority");
        return true;
    }

    //GEngine->AddOnScreenDebugMessage(-1,5,FColor::Orange,"N/A.");
    return false;
}

And later I have it so it enables and disables the characters viewmodel + world model but I'm also using UE4 native Owneronlysee

GetMesh()->SetOwnerNoSee(true); so the player cant see his own worldmodel

and Viewmodel->SetOnlyOwnerSee(true); so player can see his viewmodel only

but during the respawn func somehow it gets flipped and the character thats player cant see his viewmodel and all other players can

[prisma snow]

If I want to have a net helper actor with the same RPC capabilities than the PlayerController (I don't wanna clutter the PC with unrelated RPC functions just because it's already setup), how should I proceed? I think I need to set the owner but not sure how that's done properly

[weak linden]

You should be using the built in Player Name functionality in the player state for player names, instead of Character->GetName(), you can set the name of a character, via the game mode like this:
#multiplayer message
Adding the "dead body" suffix should be handled in your game ui for example.

Also, that still doesn't answer how and where you're calling these functions, but, regarding IsLocallyControlled, it will return true only when executed on the machine who's currently controlling the character (I.E the local players client)

[tough light]

Yeah isLocallyControlled is what I want but for some reason Posses is not allow me to call isLocallyControlled or when the new player is spawned its not possesed when beginplay is ran

[weak linden]

BeginPlay is called as soon as the actor is spawned, not when it's possessed, you also probably can't possess a character that's being spawned with SpawnActorDeferred, you will probably want to override OnPossess or OnRep_Pawn in your player controller if you need something that runs after the pawn is posessed
https://docs.unrealengine.com/5.1/en-US/API/Runtime/Engine/GameFramework/APlayerController/OnPossess/

Or, as an alternative, just run a client RPC on the new pawn after calling Possess like I do

Actually, you might be better off overriding PossessedBy in your pawn and then calling your client RPC from there

https://docs.unrealengine.com/5.1/en-US/API/Runtime/Engine/GameFramework/APawn/PossessedBy/

[worn wagon]

Yeah sure, no guarantees it's perfect though 😄

Actor header file

USTRUCT()
struct FPhysicsState
{
    GENERATED_BODY()

    UPROPERTY()
    float TimeStamp = 0.f;
    UPROPERTY()
    FVector Pos = FVector::ZeroVector;
    UPROPERTY()
    FVector LinVel = FVector::ZeroVector;
    UPROPERTY()
    FVector AngVel = FVector::ZeroVector;
    UPROPERTY()
    FRotator Rot = FRotator::ZeroRotator;
};

UCLASS()
class BLOCKPARTY_API AInterpolatedPhysics: public AActor
{
    GENERATED_BODY()
    
public:    
    // Sets default values for this actor's properties
    AInterpolatedPhysics();

    /* Physics Smoothing */
    const int32 MAX_SERVER_PHYSICS_STATES = 20;
    UPROPERTY()
    TArray<FPhysicsState> ServerPhysicsStates;
    
    UPROPERTY(ReplicatedUsing=OnRep_ServerPhysicsState)
    FPhysicsState ServerPhysicsState;
    UFUNCTION()
    void OnRep_ServerPhysicsState();

public:    
    // Called every frame
    virtual void Tick(float DeltaTime) override;

};

Relevant cpp file stuff

void AInterpolatedPhysics::OnRep_ServerPhysicsState()
{
    // Track the last MAX_PHYSICS_STATES physics states in array
    ServerPhysicsStates.Insert(ServerPhysicsState, 0);

    // Remove oldest array item above MAX_PHYSICS_STATES
    if (ServerPhysicsStates.Num() > MAX_SERVER_PHYSICS_STATES)
    {
        for (int i = MAX_SERVER_PHYSICS_STATES; i < ServerPhysicsStates.Num(); ++i)
        {
            ServerPhysicsStates.Pop();
        }
    }
}

void AWeaponThrowableProjectile::Tick(float DeltaTime)
{
    Super::Tick(DeltaTime);

    ABlockPartyPlayerController* PC = GetWorld()->GetFirstPlayerController<ABlockPartyPlayerController>();
    if (!PC) return;

    if (HasAuthority())
    {
        if (UPrimitiveComponent* PrimitiveComponent = Cast<UPrimitiveComponent>(RootComponent))
        {
            ServerPhysicsState.Pos = PrimitiveComponent->GetComponentLocation();
            ServerPhysicsState.Rot = PrimitiveComponent->GetComponentRotation();
            ServerPhysicsState.LinVel = PrimitiveComponent->GetPhysicsLinearVelocity();
            ServerPhysicsState.AngVel = PrimitiveComponent->GetPhysicsAngularVelocityInDegrees();
            ServerPhysicsState.TimeStamp = GetWorld()->GetTimeSeconds();
        }
    }
    else if (PC->NetClockComponent)
    {
        // How far back in time the actor's transform will be
        float InterpRewindTime = .1f;
        // After what time difference to stop extrapolating (too laggy)
        float ExtrapLimit = .5f;
        // The target server time we want to obtain a transform for
        float InterpTime = PC->NetClockComponent->GetServerWorldTimeRTInterpolated() - InterpRewindTime;
        
        // Interpolate
        if (ServerPhysicsStates.Num() && ServerPhysicsStates[0].TimeStamp > InterpTime)
        {
            for (int i = 0; i < ServerPhysicsStates.Num() - 1; ++i)
            {
                FPhysicsState UnderPhysicsState = ServerPhysicsStates[i];

                // Find closest PhysicsState under the re-winded current server time (InterpTime)
                if (UnderPhysicsState.TimeStamp <= InterpTime)
                {
                    UE_LOG(LogTemp, Warning, TEXT("Current Index = %i"), i);
                    // Get the closest PhysicsState over InterpTime (The PhysicsState before UnderPhysicsState is guaranteed to be over InterpTime)
                    FPhysicsState OverPhysicsState = ServerPhysicsStates[FMath::Max(i - 1, 0)];
                    float Length = OverPhysicsState.TimeStamp - UnderPhysicsState.TimeStamp;
                    double Alpha = 0.0f;

                    // Calculate the alpha value used to Lerp between both values to achieve the target transform
                    if (Length > .001f)
                        Alpha = (InterpTime - UnderPhysicsState.TimeStamp) / Length;

                    // Lerp between PhysicsStates to get our Position/Location and Rotation
                    const FVector Pos = FMath::Lerp(UnderPhysicsState.Pos, OverPhysicsState.Pos, Alpha);
                    const FRotator Rot = FMath::Lerp(UnderPhysicsState.Rot, OverPhysicsState.Rot, Alpha);

                    SetActorLocationAndRotation(Pos, Rot);
                    return;
                }
            }
        }
        // Extrapolate
        else
        {
            // If our PhysicsStates are too out of date, attempt to extrapolate the position using the latest PhysicsState's velocity values
            FPhysicsState LatestPhysicsState = ServerPhysicsStates[0];
            float ExtrapLength = InterpTime - LatestPhysicsState.TimeStamp;

            if (ExtrapLength < ExtrapLimit)
            {
                FVector Pos = LatestPhysicsState.Pos + LatestPhysicsState.LinVel * ExtrapLength;
                FRotator Rot = LatestPhysicsState.Rot + LatestPhysicsState.AngVel.Rotation() * ExtrapLength;
                SetActorLocationAndRotation(Pos, Rot);
            }
        }
    }
}

[jolly delta]

Hey, i'm looking for a few info. We currently have ue5 project that is able to run client server from the editor. We are looking to do a server build, and i am not sure if we can do it on an existing project ?

[worn wagon]

You also need an accurate synced network clock for this to work well, checkout vori's article https://vorixo.github.io/devtricks/non-destructive-synced-net-clock/

I had to make an adjustment though:

{
    const float RoundTripTime = GetWorld()->GetTimeSeconds() - ClientTimestamp;
    RTTCircularBuffer.Add(RoundTripTime);
    float AdjustedRTT = 0;
    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);
    }
    else
    {
        AdjustedRTT = RoundTripTime;
    }
    
    ServerWorldTimeDelta = ServerTimestamp - ClientTimestamp - AdjustedRTT / 2.f;
        // Added this line
    ServerWorldTimeDeltaRT = ServerTimestamp - ClientTimestamp - AdjustedRTT;
}

Don't divide the RTT by 2 for this, because the timestamps will always be out of date when your ping is above the rewind time. You can imagine on 150 ping, timestamp on server = 1 second, it gets sent to you and arrives at 1.15 seconds and now the InterpTime will be 1.05, which is greater than the most recent timestamp.

Solution is to fully compensate for the RTT, so the time when you receive the timestamp is the same (with some margin of error). Timestamp on server = 1, time when received on client = 1.

I then just have it interpolate in the tick component, this is because when the network clock gets synced by ping pong rpcs to the server, and there is a jump in this value whenever it's adjusted, so the actors will jump slightly when this happens if you don't smoothly interpolate this value.

void UNetClockComponent::TickComponent(float DeltaTime, ELevelTick TickType, FActorComponentTickFunction* ThisTickFunction)
{
    Super::TickComponent(DeltaTime, TickType, ThisTickFunction);

    ServerWorldTimeDeltaRTInterp = FMath::FInterpTo(ServerWorldTimeDeltaRTInterp, ServerWorldTimeDeltaRT, DeltaTime, 2.0f);
}

Apart from that just make sure the actor this is being applied on is set to simulate physics on the server and not the client

[thin stratus]

https://issues.unrealengine.com/issue/UE-170093

Just found this lovely bug

In case someone randomly runs into that..

[chrome bay]

oof

[thin stratus]

They probably forgot to call something from the ServerMove driven TickPose

Don't know how to see the TargetFix

[jolly delta]

may i build something that act like this setting ?

[woven basin]

yeah - i was burnt by this. I think @dry pebble actually logged the ticket a few weeks ago when she ran into the issue when 5.1 came out.

What's more concerning is I havent seen a PR in UE-Main to resolve it...

[woven bramble]

Hey, I want to test my game on the same PC, but 2 steams do not open on the same PC (Sandboxie is not fully compatible.)
I used VirtualBox, but this time I get the error "D3d11 compatible gpu feature level 11.0 shader model 5.0" when opening the game.
(Directx etc. installed.)

Do you have a suggestion?

[woven basin]

Yep - you build a Client, and then a Dedicated Server.

Or if you want the Client to also be a server, then you just build it as a normal game as a listen server.

[jolly delta]

but there is no way to do it without the sources ? like a client that act like a server but without doing gameplay as a client

[woven basin]

nope. Listen server using installed build, or Dedicated server using source build.

its not really that hard - and if you are doing dedicated server stuff then you're going to need c++ for other stuff anyway

[weak linden]

Thankyou so much! I'm going to give this a go in a moment, if you've got this sending at a lower rate than 100 times a second for the results in the video you posted, it's definitely a lot closer to being usable than my attempt/s over the last year, will be sure to report back later with the results 😅

[worn wagon]

In the video I had NetUpdateFrequency set to 10 for reference 🙂

Let me know how it goes

[weak linden]

That's a really clean visual result for 10, I've been trying to target around 30 (unsuccessfully) since this is for player vehicles that they can walk upon (so higher precision is needed), I'll be sure to report back.

One question regarding the networked clock, did you implement the NetworkEventSubsystem that was referenced on the article regarding issues with late join clock sync?

[meager raptor]

Hi everyone, when I use "Net Cull Distance Squared" and I see an asset that was previously culled there is a difference between server and client. How can I force it to sync with the client when it should not be culled ?

[worn wagon]

No I haven't bothered with this. I haven't used my network clock for much yet, and everything I have done isn't that gameplay critical, it's more visual things.

Probably a good idea though

[jolly delta]

but i can do a listen server now that to not run gameplay and then later do a dedicated server no ?

[weak linden]

I imagine it won't matter too much for short-lived actors, (like your throwables), but I guess with vehicles it'd be more of an issue, Iast thing, looking at your code, I assume you went with the RTT clock as opposed to the Circular Buffer version?

[worn wagon]

No that's the circular version

[weak linden]

Alright, thanks a ton! I'll let you know how it goes 😄

[weak linden]

You can actually locally develop to support dedicated servers, (testing with NetMode set to Play as Client instead of Listen Server as in the screenshot), you only need a source build (or custom installed build with server support) for when you package/ship the game

[jolly delta]

is an other pc can connect to this simulated dedicated server ?

like a build client

[weak linden]

You can change "number of players" to 2 and the editor will spin up and connect 2 clients for you, though that will only really work locally

[jolly delta]

meh so i need to have a dedicated build

builded unreal take 300go...

[meager raptor]

Anyone ?

[weak linden]

Can you explain a little more about what you mean? Net cull distance is basically how far away you have to be from an object before it's considered "not relevant" to you and is culled to save bandwidth/CPU, when you come back within this range, the actor will be un-culled and be relevant to you again, if you don't want actors to be culled, you can simply set "Always Relevant" under replication settings in the blueprint of the actors that're being culled, you ideally don't want to do that since things shouldn't really always be relevant (unless it's 100% necessary)

[weak linden]

If your game is packaged with "Game" target, you can probably run it with -server and it'll work for testing, but really, you do want to package with true dedicated server support if that's what you intend to ship your game with

[meager raptor]

Yep, this is a matter of optimisations. What I see is that when an actor is deculled the client is out of sync from the server. Like for example, I have an enemy that can fly. I set it's altitudes (with a replicated variable) when it's culled. When the client can see it, the altitude is not correct.

[obtuse field]

Should IsLocallyControlled() return false in standardlone?

[worn wagon]

no

[weak linden]

I think that could be more related to how you're handling your enemy moving, I had a similar issue to this when I was early prototyping my games vehicles by locally simulating movement as well as on the server, I ended up moving over to a fully server-authoritative movement setup

[meager raptor]

but that would mean a lot of replicated variable for the movement

these are the main ennemies in the level

[jolly delta]

if a client is not conencted is it marked a "is server = true" right ?

[meager raptor]

no or if in standalone

[jolly delta]

mmeh

[jolly delta]

is standalone is the state of the build ?

[weak linden]

IsServer will return true if the current worlds NetMode does not equal NM_Client

[jolly delta]

where can i check that ?

[weak linden]

Taken from here:
https://docs.unrealengine.com/4.26/en-US/API/Runtime/Engine/Engine/ENetMode/

NM_Standalone    Standalone: a game without networking, with one or more local players.

NM_DedicatedServer    Dedicated server: server with no local players.

NM_ListenServer    Listen server: a server that also has a local player who is hosting the game, available to other players on the network.

NM_Client    Network client: client connected to a remote server.

NM_MAX

Blueprint has access to these 3 functions IsServer, IsDedicatedServer and IsStandalone, which should be sufficient to test, I don't think there's any way to just "get the current net mode" in Blueprint

[jolly delta]

but i mean qhere can i get this value and or change it ?

[weak linden]

It's not really something you go changing, it's entirely based on the current networking status of your game, whether you're connected to a server, hosting as a listen server, etc

[jolly delta]

https://docs.unrealengine.com/4.27/en-US/InteractiveExperiences/Networking/Server/ did you know if that work for ue5 ?

[weak linden]

Yes, it's the same for UE5

Though the executable will be named UnrealEditor.exe instead of UE4Editor.exe

[jolly delta]

yeah i saw it

i try that UnrealEditor.exe Production Content\TopDown\Maps\TopDownMap?Listen -game -log -ResX=1280 -ResY=720 -WINDOWED but seems not to be good x)

[weak linden]

You need to use fully validated path to your project.
I just have a start_game.bat file in my project directory that does something like this:
"U:\UE_5.1\Engine\Binaries\Win64\UnrealEditor.exe" "U:\Projects\MyProject\MyProject.uproject" MapName?Listen -game -log

If you want to test in server-only mode, you use -server instead of -game

[jolly delta]

is that also work when directly start the game using the build ? lile build.exe -game ?

[weak linden]

You don't need to add -game when launching from a packaged game, it's only the UnrealEditor executable that needs it since it'd start the editor without

[jolly delta]

if i start the server using the editer should the build client can join it ?

[weak linden]

No, you can only join a server that is using the same build, I'd just suggest you look into packaging your game properly with server support if that's what you want, it takes time, but it's better than jumping through hoops

[limber gyro]

does the client have acess to the game mode variables, im under the impression that it doesnt but i dont remember for sure

[quasi tide]

No. GameMode only exists on the server.

[limber gyro]

ty

[meager raptor]

I created an animation that is playing on the server (as on the image 1), then on the client I set the values from the replicated variable (as on the image 2). I can't seem to have a good animation though even with the vinterp. I even tried to super slow down the animation but I don't see anything on the client

Any idea why ?

[twin juniper]

Hey guys. Where 's to verify if streaming is completed client side before spawning and possessing it's pawn on the beggining of the game? It's weird that the main base engine doesn't care about this for world partition

[dry pebble]

lol yep that was my bug report @woven basin 😄 Hit me a month ago when the host couldn't hear the footsteps of the clients but the clients could hear all the footsteps. Thought I was doing something wrong for so long before I tested it in the third person map.

[meager raptor]

I just had to lower the interp speed

[limber gyro]

how do u disable input in multiplayer?

ive been on this for an hour now and "disable input" doesnt work, even tho the class tick is definetly being called

[split wind]

I'm having a little trouble. When the a client joins my host server, it spawns 2 characters overlapping eachother, and then uncontrolably floats and moves upward. I have no idea..

[winged badger]

one or both get catapulted to orbit because they spawned inside one another, most likely

[limber gyro]

theres an option in your playerspawn that lets your character not spawn inside each other if i remember correctly

[winged badger]

core of your problem is that 2 spawn, use GameMode HandleStartingNewPlayer for player spawns

from blueprint the Parent functions is what calls RestartPlayer, which goes to spawn the playwer pawn

if you have servers and clients character spawning inside each other, you can just add more player starts

[pastel fiber]

Do servers internally use or call Client RPC to notify the clients that their replicated properties have been changed?

[winged badger]

they do not

that would work for very few actors

[pastel fiber]

So how do servers notify clients when replicated properties have been changed?

[winged badger]

they send a packet with the update via its actor channel

[pastel fiber]

What is the difference between this mechanism and just calling Client RPC?

[winged badger]

for one RPC stands for Remote Procedure Call

it calls a function on the other machine

normal replication does not

as net driver deserializes changed properties it received in the packet, it uses reflection to determine if there is an OnRep function and if its overloaded, then calls it

[pastel fiber]

OnRepNotify_Blablabla() on the clients is executed.

[winged badger]

which is why you can have OnRepNotify_Blablabla(FMyBlaBla OldBlaBlaValue);

overload for the OnRep

[pastel fiber]

Client RPC can also accept parameters.

[winged badger]

and also why the OnRep has to be a ufunction, and why you need to specify its name in ReplicatedUsing

[pastel fiber]

Client RPC needs UFUNCTION as well. 🙂

[winged badger]

second, you can only send client RPC through actors that belong to that connection, like PlayerController and everything owned by it

[pastel fiber]

Good point!

[winged badger]

and third, the priority and the way they are sent is not the same

reliable RPC has a high priority, and generally does not wait for the actor to have its turn to replicate

there is also a limited buffer for reliable RPCs

i think only unreliable multicasts go through the normal actor replication packet

[pastel fiber]

Replication is also reliable, right?

[winged badger]

most of the time

it has been known to break due to various engine bugs

but generally it will get there

[quasi tide]

Happens at the end of the frame as well (if I recall correctly)

[winged badger]

most notorious example being a single replicated property in a class with OnRep not working until you add another replicated property

[pastel fiber]

One of the ways the server can keep the clients synchronized is by using variable replication. The way it works is that every specific number of times per second (defined per actor in the AActor::NetUpdateFrequency variable, which is also exposed to blueprints) the variable replication system in the server will check whether there are any replicated variables (explained in the next section) in the client that need to be updated with the latest value.

[quasi tide]

int ImportantProp;
bool bHereCauseThisClassNeedsTwoReplicatedProps;

🤣

[winged badger]

i usually go with something like

UPROPERTY(Replicated)
bEpicHasABug = true;

[winged badger]

Somewhat misleading, as one could infer that server has an idea what property value on client is. It never does.

[pastel fiber]

This checking mechanism periodically is not as efficient as what you said above.

[winged badger]

Server just does "my replicated property has changed, im replicating it"

to make it even more awkward, blueprints don't really have a RepNotify mechanism

its actually a IPRopertyChangedTracker that causes blueprint "OnReps"

you can make a simple test where you change the value of RepNotify property on client locally and then watch that OnRep fire

[quasi tide]

I'm going to be honest - I'm guilty of taking advantage of that...even in SP games 😅

[pastel fiber]

Replicated properties that are changed on the owning clients will not trigger the OnRepNotify_Blablabla().

[winged badger]

Cedric looked shocked when i suggested that its fine to use RepNotify as property changed callback in single player games on #blueprint once 😄

[quasi tide]

In BP - OnRep always fires. Regardless of where the variable is changed.

[winged badger]

except for it being called RepNotify, its actually more inline with what the code behind does then using it for replication callbacks

[pastel fiber]

Remembering many exceptional behaviors in both C++ and Blueprints burdens me. 🙂

[winged badger]

you are correct as long as the scope of that statement is limited to c++

in general - if you are at least semi-comfortable in c++ you want to keep your networking entirely in c++

BP is just messy, and while it does have a basic toolkit - Replicated properties with hacked RepNotifies, Dormancy, RPCs and Actor/Component replication

that is the entirety of what blueprint can do with networking, and all the tools you can use to improve and optimize are exclusive to c++

[pastel fiber]

OK. THank you. It is time to sleep sound.

[winged badger]

since you are showing interest in how things behind the hood work, i warmly suggest giving NetSerialization.h a read

half of that header is comments.... er, documentation for network serialization

[quasi tide]

I still prototype stuff in BP on the networking side. I just expose BIE's during prototyping phase. Then when I'm liking the feature, I move to C++ and remove the BIE.

[quasi tide]

Is that the one that has like 300 lines of comments?

[winged badger]

yeah, including the FFastArray implementation example wrapped in #if 0

[quasi tide]

Always a pleasure Zlo 👍

[thin stratus]

Yeah employee of mine reported the same issue in their project

So we checked if they maybe did something wrong, but then I used my google skills and found the report :D

[fathom aspen]

Since ue5™️

/**
 * Everything related to Fast TArray Replication has been moved to "Net/Serialization/FastArraySerializer.h"
 */

[strange apex]

anyone knows how to fix this ? [ Replication ]
Host can pick up items and then drop them back
Client Can Pick the item into the inventory BUT it does not PICKUP from the floor and if the Client Drops the item it doesn't show on Host.

[sinful tree]

When you're picking up or dropping the item, are you sending an RPC to the server to do so?

[strange apex]

no but i tried to create some custom events that would run it again on Server but doesn't seem to fix it ( or it's really hard to add it to some functions )

[sinful tree]

It's not about running it again on server, it's that you need to run it on the server entirely and replicate the results.
Eg.
"E" to pick up item > Send RPC to Server with reference to the item > Server validates if item is within range of the player, and does any other checks > Server adds item to player inventory (a replicated variable of some kind) > Server Destroys Item Object.

Input to Drop Item > Send RPC to server with reference to the inventory item the player wants to drop > Server validates the player has the thing to drop > Server removes item from player's inventory > Server spawns a replicated actor of that item.

[strange apex]

okay i will try to replicate that, thanks
here is one of the Function's [ top image is player_bp ] [ bottom image is Item_Parent ]

i have never replicated before so i am quite a newbie to this

[sinful tree]

You'd need to call your RPC before you call your interface to the item. The server would end up calling the interface.

And your RPC would need to send the reference to the "Hit Actor" that you're currently feeding into your interface.

[dark edge]

@strange apex #multiplayer message

[strange apex]

i was just thinking about that

[dark edge]

You can either say "hey Mr server I just pressed my pickup button" or "hey Mr server I wanna pick up this item"

[strange apex]

i will try it now and let u know if it works

I tried putting these in every position possible in this BP , going to test it with other one now [ The Client can't pickup item at all with this ]

Tried it with the other BP but the same thing, either I am dumb and doing it wrong or it just doesn't work. [ The HOST can Pickup items BUT Client CANNOT.

[severe monolith]

put in some print strings to see where it goes wrong

usually it is some value that isn't replicated

or something that fails to cast because it doesn't exist on the client or server

[strange apex]

okay

If i do it like this then Branch comes out as FALSE

Like this it keep going ( and then ...

[strange apex]

it says it goes in but doesn't come out in another BP

[strange apex]

when the Replicated Custom event is not there it keeps going until the end but with it , it stops there and doesn't continue

[dry pebble]

Is it bad to use root motion in a multiplayer game for fast-paced movement like combat? Trying to wrap my head around this. When should you or should you not use root motion in a multiplayer context with latency in mind?

[bronze geyser]

Is there any good solution to make Chaos Vehicles work properly in multiplayer? I mean they are lagging and jitter so much on client side. Epic does great job with character movement interpolation, but Chaos Vehicles on multi are nightmare to work with

I'm using UE 5.1 btw

[woven bramble]

Hey, I want to test my game on the same PC, but 2 steams do not open on the same PC (Sandboxie is not fully compatible.)
I used VirtualBox, but this time I get the error "D3d11 compatible gpu feature level 11.0 shader model 5.0" when opening the game. (Directx etc. installed.)
How can I test the game on the same PC?

[unique cloak]

Hi, when im checking whats the ping with PlayerState->GetPingInMilliseconds() an I set the ping in the ini to 100 but it prints like 150 or more to the screen.
Why is that?
Also I changed the latency to min - 10, max - 30 bc I saw someone that doing that and how did it reduce my ping?

[woven bramble]

@weak linden Do you have any advice on this subject?

[thin stratus]

I think it also counts delta time into that or so. It's weirdly off, yeah

[unique cloak]

I think its not accurate bc its compressed

but its **really **not accurate

[thin stratus]

The virtual box probably doesn't have access to the GPU with drivers and stuff. Not sure how one would set that up. Pretty sure we gave up usually and used two pcs

[thin stratus]

Na that's not heaving that big of an effect

[unique cloak]

so why its happening?

[pallid mesa]

Very nice piece of info Ghetto, gj 👍

[pallid mesa]

on this topic, queued notifies are still broken when running on root motion setups...

[worn wagon]

I noticed my footstep sounds weren't playing for the listen host too since 5.1, thought I broke something myself.

Montage notifies play fine though

[pallid mesa]

I will always ask, but consider freezing that piece of info somewhere outside discord so its accessible to devs 😄

[worn wagon]

I wouldn't mind doing so, just I'm not sure the implementation is 100% perfect yet since I haven't stress tested it, although it seems fine. I posted it coz the guy asked about it

[pallid mesa]

that's when the community effort happens. Remember how many iterations we did here together until we got a nicely done network clock article?

I personally believe that these sources of information can be a very great way to learn by example and to reason about problems

because maybe.. you can even find out a bug or something unintended while writing your reasoning 😄

[worn wagon]

Yeah definitely, I've noticed that trying to teach people helps your own understanding a ton.

[pallid mesa]

I started my blog just for myself

as a way to take notes and preserve them

then I figured that it'd be cool to share them with the people and keep them fresh if someone finds a better way to do something, keeping it always open for improvements

[worn wagon]

Open source mindset

I've very grateful to people like you in this community, since the documentation for unreal is a bit lacking compared to something like unity

[pallid mesa]

only at a very superficial level, let's say 101s because the intent is not for people to copy what I write, the intent is for people to understand the problem, seeing a simplistic approach and then expand upon it

physics state interpolation is such an excelent example to learn extra-interpolation

which can be applied to many many things

[worn wagon]

I saw someone asking about chaos vehicles being laggy on the client, I haven't messed around with them but I'm guessing there's no out of the box interpolation or prediction. I wonder if a similar approach could be applied to that.

[pallid mesa]

sure thing, server authorative movement working at a reduced net update rate needs some love

but I'd start with an example as simple as yours, a bouncy ball or a cube falling

NPP can be explored for predictive movement, but thats another topic

[worn wagon]

NPP?

[pallid mesa]

that's a can of worms aint opening now x'D (network prediction plugin)

[worn wagon]

Ohhh I remember looking into that but read it was abandoned

[pallid mesa]

thats what some people say, but the reality might be far from that, who knows

if you are interested in the topic, you can take a look, it won't hurt. Btw if you get to publish the inter-extra server auth somewhere, feel free to ping me (lmk)

[worn wagon]

Sure thing 😄

[rough jolt]

Clients are getting disconnected from my server randomly, I can't discern a pattern. Any ideas how to debug this?

[worn wagon]

Is it listen or dedicated? And how long do they stay connected for usually?

[rough jolt]

Listen. it seems to be completely random from immediately while connecting to 5-10 minutes

[pallid mesa]

maybe too harsh on your _validate implementations? 😄

usually disconnects come with a reason

[rough jolt]

It's not a crash, and as the host i can't notice any performance issues when folks get disconnected. sometimes it disconnects everyone at once, but it just kicks them to the main menu

[worn wagon]

nothing in the log at all?

[rough jolt]

What's the log file?

[pallid mesa]

ah, everyone? are you doing a hard travel through steam?

does this happen during map change?

[rough jolt]

There's no map changes in my game and we're not using any kind of steam implementation

[pallid mesa]

whats your online subsystem?

log files can be found on /Saved/~

[rough jolt]

Oh, i was using the packaged build

[pallid mesa]

but where r u deploying?

no subsystem, just join through exposed IP?

[rough jolt]

I'm sorry if i don't follow the terminology very well, i'm not very good at this yet
I have a text field where you put the IP, and it needs port forwarding, so i assume that's it, yes

it's the simplest listen server you could have i'd imagine

[pallid mesa]

ah, all right all right ~

you'll need to take a look at your server log when you execute it (you can have a live log by launching your listen server with -log parameter)

there are some functions in the engine you can debug to check why someone disconnected but I dont have ue at hand now to point you where -

checking the log might be insightful enough

[rough jolt]

so the best way to test it is within the editor? cause it doesn't seem like the packaged build makes logs

[rough jolt]

@pallid mesa How am I supposed to get those logs? cause i can't figure out. In the editor (if i play standalone) the message log is empty, the output log has nothing

[fathom aspen]

It does, it's under Saved/Logs

[fathom aspen]

The output log always has something

[rough jolt]

Could this be it?

[rough jolt]

does this make any sense to anyone?

[dark edge]

You sending reliable RPCs on tick anywhere?

[rough jolt]

not that I can find. the first times i checked the log it named a few specific functions that were reliable, i made them not reliable, the functions mentioned changed

now those functions being mentioned aren't reliable

and it still kicks my clients out, on top of replicating a whole lot worse

Also, every time i "un-reliable" one of these functions, they become, well, unreliable

and i can actually notice them not being correctly RPC'd sometimes

which i don't know how to fix

[dark edge]

You should unreliable everything that can be, and only make reliable the stuff that HAS to happen

if it's something that's being spammed every frame, then make them unreliable

[gray orchid]

Would anyone know how to fix a problem I have where I have two scopes using render targets and when the other player spawns in the targets switch?

[dark edge]

Show your logic

[gray orchid]

it just a render target with a mat on a cylinder

not much to show

[weak linden]

You can't test with two "steam" clients locally (a local client + server is fine however), it has to be separate computers, either that, or you run your instances with -nosteam and make sure Null Subsystem is a fallback for testing

[weak linden]

Most of those errors are the functions "ApplyImpact" and "TrackTarget" being called in the wrong place, such as a server/client RPC being called on a client that does not own those objects

[rough jolt]

The problem was a certain function being set to reliable. i'm not exactly sure why it was happening, but I messed around a little with how i was calling it and managed to get it to a point i'm happy with I believe :)

thank you all for your advice :)

[weak linden]

@worn wagon I could kiss your right now, 30 updates/s send rate, emulated 250ms, aside from the response to inputs, it feels really nice!

[woven basin]

What was the trick/lesson/info that helped?

[weak linden]

I think it's a combination of factors, but largely I'd say it's the addition of the network synced clock and the way I was de-queueing my snapshots, the code that Ghetto provided is just a ton simpler than what I was doing, there's still some minor jitter when interpolating rotations, but overall, it's a far better result for actual positions and it's over 3 times more efficient network wise.

Actually, I think the rotation jitter is unrelated to the interpolation itself, as soon as I de-possess and stand on the deck, it's unnoticeable

[civic seal]

Question - is it possible to spawn an actor on the client in anticipation of the authoritative version of this actor spawning on the server, and then attaching replication later? I'm trying to figure out how to best deal with the inevitable latency when spawning projectiles belonging to the player.

[weak linden]

I think that's a little over cautious, just locally play the client effects (fire animation, muzzle effects) and just allow the spawning to happen on the sever

The lesser of all evils is making sure it feels like they've actually shot their weapon as opposed to the result of what shooting their weapon would do, not to mention, in most scenarios, latency won't be a problem

[hollow eagle]

You actually can though it has some restrictions (primarily that the actor must be named in a way that the server can predict), and really should only be used if you absolutely need to. See this article for an example (it's for doing procgen but the info about net startup/net addressable actors is relevant even if you're not doing so): https://vorixo.github.io/devtricks/procgen/

[civic seal]

@hollow eagle @weak linden thank you!

[spare garden]

good day to all! Been a lurker in this server for a while, and finally need to ask for some help! I am having an issue with what I think is replication of player movement and actions depending on the net mode chosen. If I select stand alone, then everything works fine for both clients. If this is not chosen, then both clients have issues with certain things. For example, I have a teleport ability implemented which just moves the player character to a point of reference. The marker spawns and everything seems to work fine, which tells me the BP is working. But upon release of the key, the player jumps to the spot but is jerked back to their starting location. Another issue is with sprinting. I am not sure if this has to do with the fact I have a stamina mechanism associated with movement, but the clients will 'stutter' when I try sprint if the net mode is not set to standalone. And one last thing is with damage to other actors. I have a spawner which just continuously spawn enemy actors in. Both clients see the actors spawning, but upon interacting or trying to damage them, the damage does not apply. I have a print string configured to output the hits and where they register, so I know that the 'bullets' are hitting the target, but the damage doesnt apply. Is this all one setting I have wrong dealing with replicating or am I missing something else entirely? Thanks!

[weak linden]

To me this sounds like much of it isn't replicating at all, Standalone means no networking, so that's why it will work perfectly, it sounds like you're not doing anything via the server for your teleport and/or sprinting

[sonic python]

Hey Guys My In Game Hud is not seen by the client

what should i do?

is this related to RPCs?

[weak linden]

Maybe, widgets are supposed to only be created client side, so the the first question I have is where are you creating your widgets?

Personally, I like to use the dedicated HUD class for managing references to each of my widgets, tends to avoid the chaos that is "lets create widget all over the place because it's easier" 😅

Plus, the HUD class is:

1. Only created client side anyway.
2. Referenceable from anywhere you can get the local players controller.

[sonic python]

I have a event Show in-game hud in player controller

And when event begin play in the player controller it will set it

[spare garden]

Hmm I figured as much...I went through and chose to replicate (not repnotify) all of the variables involved, but it still didn't work. I'm honestly not sure which option to choose for the second drop down, there's like a dozen choices.

I'm still trying to learn about multiplayer setup and all that.

[sonic python]

Okay did that

Fixedddd

Now My Lobby timer , after completing the time , it is not disappearing for my client

[sonic python]

Hey and

My Characters jittering stops , when I tick that ignore client movement and server accept client authoritative position, but the tick goes off after sometime

And One More prob

My Client Can't Get out of the vehicle ,

And Couldn't drive it

[hushed rain]

Is it possible to control a spawned pawn(that uses Character Movement) without possessing it? I cant seem to send inputs to it.

[sonic python]

In Ship Bp

What should I do?

[frank phoenix]

Is there a way to know if a client connected as a Pixelstreaming client? Should i check the connection options string for that?

[sonic python]

He gets in

he is not able to control the vehicle but

anyone want to help can see the codes

[worn wagon]

Glad to hear it 😄

Yeah the only downside is because it's 100ms in the past it appears frozen momentarily after spawning. I was considering adding some code to make it invisible until the buffer has over 100ms of physics data

[prisma snow]

What would be a good way to handle race conditions in replication?

I have the following scenario, which works well as an example:
I spawn a battalion of units on the server, which gets ordered to move out of a building (in the same frame/function). This move order is multicasted for all clients.
However, because the newly spawned battalion (which is replicated) does not exist on the client yet, it happens that the move order (RPC) arrives earlier than the actor is spawned in the clients, so it is null. I can use a small timer but I wonder if there are best practises or recommendations about handling this kind of scenarios

[chrome bay]

Me personally, my "orders" are replicated

The "orders" themselves live in a single actor which replicates them out, the units executing the order store the order ID they are executing

[oak hornet]

Hi how can i manage levels and stuff like that in multiplayer, how to travel from lobby to game level? for example, cant find anything related and i guess its pretty common

sorry im a bit stressed

found the offical doc

[prisma snow]

Interesting, not sure I can do a similar approach (due to it being an RTS where orders are handled in quite a complex way) but I'll try to think of a way to do it 😄

[chrome bay]

Hmm my approach should also work for RTS I think (that's what mine was done for, sort of)

Hasn't really been trialled on lots of commands yet though

[prisma snow]

ohh lol

well this case is complex, orders are given by the player controller through a helper actor for replication, then once replicated orders are passed to the corresponding battalions, who then store them in a queue and execute in order

[chrome bay]

yeah is quite similar to what I do really

[prisma snow]

since there are quite a few battalions and orders replicating them as a stateful prop could be too heavy

[chrome bay]

I basically have my "orders" in a fast array, and a "data" actor for each connection (with it's own "orders" array)

Since an order doesn't change once it's added, and I purge old orders when nothing is using them anymore

[pastel fiber]

A projectile fired by one client explodes when it hits the wall. But from other clients, the projectile explodes before hitting the wall. What causes this out-of-sync event?

[chrome bay]

Hard to say without knowing how the networking of it works

But presumably, the projectile is exploding server-side before it's had a chance to move client side

[worn wagon]

Weird that you say for one client it's normal though

[prisma snow]

Mmm interesting, need to think about it but might simplify the approach and process. I assume you have some kind of OnRep to issue the orders locally once replicated

[chrome bay]

Sort of. What each unit is executing is replicated indirectly through the same data object

Once all rep notifies have processed, it dispatches the updates

[prisma snow]

I see

[chrome bay]

My system is massively overengineered tbh 😄

[prisma snow]

I assume each unit is an actor that is also replicated?

[prisma snow]

well it's useful to know. It is very tricky to handle race conditions with initialization in multiplayer

[chrome bay]

Ah no, each unit is just a local-only component (but is network addressable). It's usually attached to a player state

[prisma snow]

I see

[chrome bay]

I deliberately didn't want every unit to be individually replicated to avoid such race conditions, but also just the general cost of having all those extra replicated comps

[pastel fiber]

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

    if (GetLocalRole() == ROLE_Authority)
    {
        SphereComponent->OnComponentHit.AddDynamic(this, &ThisClass::OnProjectileImpact);
    }
}

void AMyProjectile::Destroyed()
{
    FVector SpawnLocation = GetActorLocation();
    UGameplayStatics::SpawnEmitterAtLocation(
        this,
        ExplosionEffect,
        SpawnLocation,
        FRotator::ZeroRotator,
        true,
        EPSCPoolMethod::AutoRelease);
}

void AMyProjectile::OnProjectileImpact(
    UPrimitiveComponent* HitComponent,
    AActor* OtherActor,
    UPrimitiveComponent* OtherComp,
    FVector NormalImpulse,
    const FHitResult& Hit)
{
    if (OtherActor)
    {
        UGameplayStatics::ApplyPointDamage(
            OtherActor, 
            Damage, 
            NormalImpulse, 
            Hit, 
            GetInstigator()->Controller, 
            this, 
            DamageType);
    }

    Destroy();
}

void AMyProjectCharacter::Fire()
{
    if (!bIsFiringWeapon)
    {
        bIsFiringWeapon = true;
        GetWorld()->GetTimerManager().SetTimer(FiringTimer, [this] {bIsFiringWeapon = false; }, 0.25f, false);
        HandleFire();
    }
}


void AMyProjectCharacter::HandleFire_Implementation() // Server RPC
{
    FVector spawnLocation = GetActorLocation() + (GetActorRotation().Vector() * 100.0f) + (GetActorUpVector() * 50.0f);
    FRotator spawnRotation = GetActorRotation();

    FActorSpawnParameters spawnParameters;
    spawnParameters.Instigator = GetInstigator();
    spawnParameters.Owner = this;

    GetWorld()->SpawnActor<AMyProjectile>(AMyProjectile::StaticClass(), spawnLocation, spawnRotation, spawnParameters);
}

[chrome bay]

Well it's pretty obvious really - server is destroying the actor as soon as it hits something, so there's every possibility the client will destroy it before it reaches the same location it was in server-side

[prisma snow]

yeah indeed, same here. But those unit were replicated initially (and the battalions still are) so I'm in a kind of mixed context xD

Probs I should rewrite all the logic so that battalion handles are also not replicated, but then I need to make all those objects to spawn in both client and server and make sure I can reference both properly

[pastel fiber]

But the explosion effect is spawned at the location provided by the server. It should explode at the same location but different time.

[chrome bay]

GetActorLocation() isn't necessarily the location it exploded at

It's whatever the current location is client-side

If the actor is destroyed, then it won't get replicated property updates

[pastel fiber]

OK. Thanks.

[azure karma]

Hello, I am trying to get my server run on Linux and it gives me this error. Did someone run into the same problem and might please be able to help me fix it? 😅

[torpid nymph]

what's the proper way to carry details about the player to the server, things like, nickname and weapon choice, I've been doing that through the gameinstance and retrieving it on the client and sending rpc to the server, but I'm wondering if there's a cleaner solution

[quasi tide]

That's the general approach mostly, yeah.

[pallid mesa]

@dry pebble Hey Meags, I recall u were having the notify issue on listen servers, to fix it you have to add this in your DefaultEngine.ini (only works in >= UE 5.1)

[SystemSettings]
a.EnableQueuedAnimEventsOnServer=1

[worn wagon]

Does this fix anim notifies not played on listen hosts?

[quasi tide]

Yeah

[worn wagon]

[pallid mesa]

but it doesn't fix anim notifes played reliably under root motion montages 😬

@worn wagon

[worn wagon]

I don't use root motion 😄

Still that sucks

[quasi tide]

Root motion is just a mixed bag with UE & networking

[pallid mesa]

oh yeah it is lol

but sometimes there's no other option, specially due to the level of controllability

[quasi tide]

I wonder if you can bypass it by doing root motion manually? 🤔

technically it isn't root motion

https://landelare.github.io/2022/05/15/climbing-with-root-motion.html

Laura only talks about climbing, but the idea is there.

[pallid mesa]

rm gets sorted in the cmc doing something similar, the problem comes from disptaching conditionally the queued notifies

as the current code only accounts for animations without root motion

https://github.com/EpicGames/UnrealEngine/blob/d452b2b44ec41f9a26ad94ea4d1d02adc8f57db3/Engine/Source/Runtime/Engine/Private/Components/CharacterMovementComponent.cpp#L9740 (Ignore the selected CS)

will prolly do a PR or something

[worn wagon]

Where did you find this btw?