multiplayer

[grizzled stirrup]

If you destroy a controller, does that also destroy the playerstate associated with it?

Trying to stop AI controllers that have playerstates from begin copied over via seamless travel

Is the brute force method of just looping over all AI controllers and destroying them (and their playerstates) before travel a valid approach?

[winged badger]

they aren't carried over by default

you have to expliditly mark them to persist

[grizzled stirrup]

Oh ok thanks I think I was misreading the logs

When the docs says this All Controllers that have a valid PlayerState (server only) do they mean all PlayerControllers that have a valid PS?

That's from the seamless travel docs that state what persists by default

[winged badger]

it means PlayerControllers

read GetSeamlessTravelActorList

[grizzled stirrup]

Thanks!!

[tulip ferry]

Is it normal for one playercontroller to be shared amongst all clients in PIE? When I run my game in PIE (dedicated or listen), the same playercontroller is shared across all the clients. However, on the server, all the player controllers are present as expected.

[ripe hound]

when i want to make a multiplayer game i did see you can do it with a dedicated server pack or Steam whats the difference?

[bold mica]

do tags replicate? or do I have to make sure to replicate that myself?

[rose egret]

how do I implement Server Authoritative Pickups of items?
Imagine my game is like APEX. what should client send to server for pickup. I want it to be fast peace and secure.

currently I do a raycast from center of the screen in the client to highlight the item

should I send HistResult, HittedItem, or RayCast ?

[faint dock]

send the item and check if the player is in range on server

[cinder quartz]

I use interface and timer. Player "scans" for items with raycast every 0.1s and then calls Use on item he wants and the server checks if the item can be picked up.

Server also "locks" the item if multiple people spam pickup on it on laggy conditions.

and the first guy gets it

So every item that can be "used", uses same interface so they have use function

and the trace only checks for items that have this interface

[rose egret]

my worry is I don't want the cheater to write a tools for picking best items automatically.

[cinder quartz]

you can have the server check for it

[faint dock]

then do the trace on the server

[rose egret]

one think could be checking the distance between player and item

[cinder quartz]

yeah that would work

[faint dock]

also the cheat can just make a bot there is not much you can do against this

thats a fight that you 100% gonna lose if someone realy wants it

like a aimbot for items

so dont bother

[rose egret]

@faint dock how do I do the trace on server. can I get the exact position and rotation of player on server at the time when user pressed 'Use'

[faint dock]

yes

[rose egret]

I mean without sending by client

[cinder quartz]

so like walk over object and player picks it up automatically?

[faint dock]

there is more then one way

[cinder quartz]

i would use server side trigger

like collider

[faint dock]

i think he want the player to look at the item

[rose egret]

yes. players look at the items and press F

I am trying to release my game for normal users with ping 100.

[cinder quartz]

you could make the trace and logic all server side and when server detects the item, send client some info so client can press f to pick it up

[faint dock]

then you have alot of lag

[cinder quartz]

i just use client side detection and server decides if the player can pick it up or not

[faint dock]

client should do a RPC

[rose egret]

🤔

[cinder quartz]

yeah, thats how I do it. Client sends rpc(I want this item), then server decides what to do. If server says ok, then I put it in players inventory server side, and the inventory is replicated

[faint dock]

yes

[cinder quartz]

it works nice, sure theres a little delay if player has like 200+ ping but its better than client picking anything he wants anytime

[rose egret]

🤔

[faint dock]

200ms is not that bad for things like that

[cinder quartz]

also tested with simulating 2k ping and multiple players spamming pickup on same object, doesnt break, one guy gets the item and others get nothing

[faint dock]

but he said 100ms

[rose egret]

thanks guys I will it

I think checking the distance is enough at the moment

[cinder quartz]

yeah, for weapons I actually put them on players back since they are actors with logic on them, so for them when someone picks it, I put the weapons Owner to that picking player and to none when the weapon is dropped

also I disable "pickup" collider so others cant try pick weapons from other players back

so on server I first test if owner is none, then I can pick it up, if it already has owner, do nothing

but if its something you destoy/hide etc when picked up, then it doesnt need to check for owner

[faint dock]

i would always destroy it

[cinder quartz]

thats propably better way and just switch the mesh on different weapons and some stats like fire rate

[faint dock]

a item on the ground should not be the same as the weapon player holds in the hand

[cinder quartz]

true

[faint dock]

even if the item on the ground is a weapon

[cinder quartz]

but I'm using Epic's Shooter game as guideline

they have weapon as actor in the world that gets just moved to players inventory

[faint dock]

seams hacky

[cinder quartz]

but if you have lot of weapons like a survival game etc, you propably dont wanna do it like that

[faint dock]

yeah if you have like 8 players i dont think it mattes much

[cinder quartz]

yea mine has 4 players and its match based so its not that important

[faint dock]

also is not persistent i guess

[cinder quartz]

yeah, nope

match starts = players have no weapons, they have to find them first on the map

[high current]

UT has an inventory system, I think more robust than ShooterGame, you might wanna take a look on github

[cinder quartz]

yeah I actually need to do that. Look at UT, has been plan for while now, its just huge and scary codebase haha

they also have cool custom movement component thats worth a look

[plain lagoon]

is there a way to create listen servers that can be accessed from everywhere(not only lan) without the use of steam integration, a dedicated server or port forwarding?

[winged badger]

With equivalent service steam provides yes

[plain lagoon]

do you know of any plugins that take care of that?

[winged badger]

No

[high current]

there was a free marketplace plugin

[winged badger]

Something has to be out on the internet with public ip to provide matchmaking

[high current]

https://www.unrealengine.com/marketplace/en-US/slug/uetopia-online-subsystem

never used it tho

[winged badger]

Or none of it works

[cinder quartz]

I'm waiting for this: https://dev.epicgames.com/en-US/services It seems to have matchmaking "coming soon"

[bitter oriole]

Probably mid next year

And no one know how good it will be

[winged badger]

It will probably be good 6-12 months after that

[cinder quartz]

https://trello.com/b/ZR7VrLb3/epic-online-services-roadmap says 2019 here but we'll see

[bitter oriole]

EGS features are already 6 months late and they're public store feature

Don't expect anything this year or early next year

[grizzled stirrup]

Having trouble with copying properties via playerstate over seamless travel: things like ints for score or health upgrades are working just fine but when I copy a TSubclassOf<AMyWeapon> class, it logs out fine after the seamless travel (when logging inside the CopyProperties() function), but when my character fetches that class from the playerstate it's always null. Are there any gotchas that could be causing this?

the weapon property is marked as a UPROPERTY() and is public, even though I'm not sure those are necessary for CopyProperties()

The weirdest thing is that it was working fine yesterday for one weapon, but another weapon of the same type crashed the engine (as it was null). Basically the flow is: player picks up weapon, it replaces the current equipped weapon and sets the weapon to spawn class in the PS, then on the next level after seamless travel, the player should spawn that same weapon class again (as CopyProperties() will move the class from the previous level into this new level)

[high current]

Any reason for all of this to be in the player state as opposed to the player controller?

[grizzled stirrup]

@high current I guess it could be stored in the PC too, but the PS CopyProperties() method still should work just fine. I wonder where I'm going wrong with it

It's hard to debug normally because you need to run a standalone game for seamless travel

[high current]

I was just noting that perhaps other clients dont need to be aware of the saved properties

[grizzled stirrup]

That's very true, I do have AI controllers using the exact same setup as players which meant the PS was a nice middleground to store this stuff

I'll try moving it to the controllers and fetching depending on if you are human or AI

[high current]

A player state is always relevant

Idk if other claases have the copy properties override tho, so maybe ignore my ramblings :d

[grizzled stirrup]

I believe the PC does come across just fine

I'll test with it now

Thanks for the help!

[high current]

There is always the GI

For data transfer

But that is last resort

[grizzled stirrup]

Yeah I had been using that before but have been trying to move to the "correct" way of persisting data

It's just frustrating that it works for everything but the TSubclass<AMyWeapon> classes

Which makes me think I'm just accidentally setting it somewhere else or something

[grizzled stirrup]

Ok I was being an idiot and checking if the empty PS reference was valid before setting it on CopyProperties() 😄

So it never got set, got the order of CopyProperties() mixed up!

Am I correct in saying that CopyProperties() is called on the OLD PS with the PS being fed in being the new one?

[karmic briar]

wanna ask is there ways to do seamless travel?i've seen this question lots of times and do we have method to do it without changing the source code or changing the source code is needed?

[cinder quartz]

Execute Console command "ServelTravel mapname" should work ?

at least it worked on LAN going from lobby to actual map

havent tested over net yet

[karmic briar]

im searching for solution on this one and really want one without need of loading screen

[brittle karma]

guys if i use GetController() in an RPC, would it return client's Controller? or is there any way to get Client version of Controller in server side?

[winged badger]

if the RPC is on client's pawn, yes

otherwise, no

[mystic patio]

@karmic briar Seamless travel is a bool option on the game mode class. I believe it's off by default, but by setting it to true, it should cause (e.g.) the ServerTravel console command to do so seamlessly.

[karmic briar]

can u show me how to do it?

[mystic patio]

Do you have a game mode Blueprint? If so, just look in its class defaults for the UseSeamlessTravel variable, and set it to true.

You'll also need to set up a transition map in the project settings, which can probably just be a separate blank level while you're testing things out.

The transition map setting can be found under the advanced section of the maps and modes category in the project settings.

[karmic briar]

can the transition map be a blank map?

[mystic patio]

I think so! That's pretty much what I'm using for now.

[limber mortar]

I'm trying to make a scoreboard transition map for my game

[cinder steppe]

hey guys, how can i send a message from one client to another other specific client?

duno how the server is supposed to know who is who

[high current]

GameState has an array of PlayerStates

if you for example have a team based game, upon team selection you can let each player controller notify the player state what team they are on

and then cycle from the player state array

but everything has to go trough the server either way

upon what logic do you need to send info from one client to another

[cinder steppe]

that would work if you have a set team. but im not using a lobby or something like that

but sending a PM to one of thousends of players

also there is the lack of security.

[winged badger]

you're not going to have thousands of players ^

[cinder steppe]

thank you

[winged badger]

the unreals network is not made for that kind of a load

[cinder steppe]

they are not on a map

they are simply in the main menu

[winged badger]

then you're not going to send the message via unreal

[high current]

maybe he is from Improbable, just testing us, see if we know whats up

[cinder steppe]

so i would have to send it to the database first or something like that?

[high current]

if they are not within the same map (server) then unreal cant see them

[cinder steppe]

my point

^^

so how do i work around that

[winged badger]

ideally, you use an existing service, steam lobby would do

[cinder steppe]

that would mean i need to use steam and im not interested in that.

id like it to be independent

maybe IP based?

[winged badger]

you can either use an existing service or spend a couple of years developing stuff that already exists shrug

[cinder steppe]

hmmm

[high current]

🤔

[cinder steppe]

a messeging service would be nice. but i dont want to force my players into using steam

[high current]

if your game is going to have 1000 players, if it isnt on steam or any major platform, how are you going to get these 1000 players

[cinder steppe]

thats not the point

crowdfunding xDDD.......

...

[high current]

either way

https://www.unrealengine.com/marketplace/en-US/slug/realtime-database-firebase

[cinder steppe]

but you get what i want. isnt there a messeging plugin

sure 200 bugs if im correct

[thin stratus]

Backends like GameSparks or PlayFab should be able to do that

But well

[cinder steppe]

but i guess i wound come around it

[high current]

its a database, you can do what you want with it, and you are not forcing your users to download anything IIRC with gameDNA

but never used them so it warants some exploration on that end

[cinder steppe]

i already have an external database

[thin stratus]

Firebase is basically the same stuff. They are all just backends

But either way you need your clients to authenticate

If you don't use Steam

Or similar

YOu'll need Username/Password login

[cinder steppe]

still leaves me with the question. how does the DB know who is who?

[thin stratus]

Or at least device ID login

By having UniqueIDs

[cinder steppe]

i have username password login

working

[thin stratus]

Which comes with letting users register and login

Then your backend should keep track of who is who

The player is online after all

Your backend needs to have an endpoint in the UE4 client

Which has to listen for incoming messages

[cinder steppe]

well login system is working but im not that far. i just started learning SQL/PHP

[thin stratus]

Welp, either way, your backend should know based on sessions which actualy game client is which player in the DB

That way you can target people

How you code that is up to you.

[cinder steppe]

im only letting the server GET if username and password are valid

letting the requested client access

[thin stratus]

Stuff like this has to be properly authenticated

The Server needs to know whoever sends the requests is authenticated

You need to keep track of sessions

Otherwise you are coding the biggest cheat and hack fest ever

If this game should actually sell, then either you quickly learn how to do it properly

[cinder steppe]

😄

[thin stratus]

Or you keep your fingers away from it

[cinder steppe]

its just a prototype

[thin stratus]

GameSparks and such exist for a reaon

[high current]

There are middleware things out there that wouldn't require the user to install anything separately and probably ease some of the work and save you the trouble of worrying about security risks and so on

IIRC discord's game API allowed messaging and did not require the client to actually have a discord account.

[cinder steppe]

that could work since i dont intend to save messages.

now one needs to finde such a thing

and i dont see my self doing that in the next 5 minutes ^^

i think its time to call it a day

i could have a line in the database just for a line of text.
client-1 to server, server calles DB, DB selects REGKEY, DB edits the text, then somehow sends it to the REGKEY-client in UE4 and then the DB delets the line of text.

sounds like a winner to me xD#

[high current]

you also need a way for the player to know who they are sending a message

like a friend system

also something that steam has 😄

[cinder steppe]

ive got that

kinda

WIP.... pssssst

thing is

i need to send an invite to the friends list like a message xDDDD

[grizzled stirrup]

In this example from AGameMode /** Returns true if ready to Start Match. Games should override this */ UFUNCTION(BlueprintNativeEvent, Category="Game") bool ReadyToStartMatch();

How can I override it if it's not a virtual function?

Or maybe it is but not marked virtual bool? EDIT: nvm the solution is covered in Exi's compendium at page 16

[cinder steppe]

ist there a listen funktion?
server says : "Yo, i gotta message for 6ch48. who is that)"
client says: " Hey hey, thats me, thats me"

[high current]

your database is going to that part

your database determiens who is 6ch48

[cinder steppe]

yes.. but how does the DB send it to the client?

the server will only know the REGKEY but cant find the client that logged in as that REGKEY

im missing something here

[high current]

your database runs somewhere, and all the servers running have access to that somewhere

[cinder steppe]

yes

[high current]

your database needs to be able to communicate to each server

and as you want to do the database stuff yourself, it is up to you to write a plugin that does that

[cinder steppe]

the only communication so far is a return value... gues that wont get me far :/

ah shit

[high current]

Been playing Insurgency Sandstorm lately, weapons have a lot of attachments there, and when you are spectating, and cycling trough your team mates, the attachments load up after the gun model every time(like a split second after it, it is visually annoying)

How would such a thing be handled, I am just curious

If you were to have a weapon full of child components and SMs

which isnt always releveant obviously and gets unloaded as soon as you view the other person

I guess you can delay the weapon visibility until all its children are loaded

but that leaves you with half a second of nothing when you cycle

Another one I can think of is to load the data from 3 players, and not just the one you are viewing, but the next and previous one

that way at least you will see the issue only if you spam the cycle button

[cinder steppe]

btw XMPP might be se solution

[winged badger]

provided your only option to cycle through the players is previous and next

it would be awkward to wire that in with IsNetRelevantFor though

[tired juniper]

Hi.
Is there anyway to test sessions in the editor? Or at least locally? I can't make it find sessions. If I try throught different computers it works fine, but it's being a pain to develop and test, since I can't even try the game in the editor..

[mighty rover]

does a dedicated server have a singleton/static class that never goes away, even during server map travel?

similar to game instance for clients

[worthy perch]

GameInstance.

[mighty rover]

I didn't think dedicated server has a game instance?

[worthy perch]

It does.

[mighty rover]

is it a different game instance from the client one?

or can we set this somewhere?

[worthy perch]

Nope, same thing. Behaves exactly the same too.

You can set the GameInstance class in Project Settings.

[mighty rover]

@worthy perch thank you, I knew about setting it in project settings, I just didn't think that the game instance itself was loaded on the dedicated server at all. mahalo!

[high current]

@winged badger what would your solution be

@tired juniper that is often the pain of MP dev. You cant connect 2 pie sessions together (believe me I have tried) :d

You can test with simulated players in editor

Iirc you can launch multiple standalone versions of the game

Without packaging it

Via cmd and an extension to the .uproject

But idk if it will work for session finding

[tired juniper]

hey @high current Thanks 😦
I ended up avoiding sessions in PIE, and tried using LAN in 2 local instances... that last thing doesn't work for me. It works well tho for 2 different computers with different Steam Accounts.... what a pain

[high current]

oh yes, sorry I did not account for steam subsystem usage

[grizzled stirrup]

Is it recommended to use AHUD to store and create UMG widgets clientside instead of doing that in the PlayerController?

I've noticed after seamless travel, if the widgets were drawn on the screen via the PlayerController, a stale and inactive version of the widget persists after seamless travel and can't be removed unless manually removing from viewport before traveling

I am guessing that using AHUD removes this problem as it won't be copied over and a fresh HUD can be initialized after travel

[fleet raven]

using hud to own widgets is very common

[upbeat hound]

Hi

I'm having trouble executing something.., here it goes

There is an equipment in the room (bp class), it has a static mesh, a box and a widget

when players overlap the box, they are "using" the equipment, and they should see the widget (which is basically a progress bar that increments gradually)

but only the player using the equipment should see the widget

How should I do that?

(right now, if one player uses equipment, all players see it.)

[solar stirrup]

Spawn the widget on the client?

[upbeat hound]

(also, for some reason, I only see the progress bar.. progresses on the server, no clients see changes)

[solar stirrup]

Spawn the widget only on the client who's overlapping, and replicate the progress from server to client

[upbeat hound]

and when he stops using the equipment, I should.. destroy it? (how do I do that?)

[solar stirrup]

Either make it visible/invisible (add it to the equipment bp and make it invisible by default), or destroy it once you're done using it

[upbeat hound]

Yeah right now it's added to the equipment bp and as invisible, and I try to make it visible only for the using player

(it's easier if it's on the equipment because then I can "design" it's place and move it around the equipment to set the location properly)

But can't get the pb to work..

[mystic patio]

@upbeat hound , are you talking about a UWidgetComponent? i.e. a 3D widget that is attached to your equipment actor?

[upbeat hound]

Yes the widget is a widget component attached to the equipment actor

[mystic patio]

Gotcha. So to make that visible only to one player is gonna be a little different, I"m pretty sure.

[upbeat hound]

How T_T

[mystic patio]

Just a guess, since I've never done exactly this myself, but you might want to look into the 'Only Owner See' (bOnlyOwnerSee) boolean on that UWidgetComponent.

Trouble is, the UWidgetComponent will probably not be owned by any individual player — it will probably be owned by the server. So this approach might not work either.

[upbeat hound]

Yeah.. I've seen that but there are two functions, "Set Owner Player", and this is only for local player they say, and there is "Set Owner" but that doesn't take widget as input

Thank you for the suggestion though

Any other suggestions? 😄

[cinder quartz]

have the widget invisible and simply turn it on on the client side when needed? no other client will know it changed

server can send clientrpc to one client only if needed

[upbeat hound]

Well that is the challenge, I'm not sure how to do that

[cinder quartz]

to turn it on if client cant handle the logic

[mystic patio]

That's it. That's the way to do it.

[upbeat hound]

How do I send a clientrpc (I'm working with bp) to a specific client?

[cinder quartz]

well, for example, if you have somekind of trigger volume on server, player1 enters it, server calls clientrpc on player1, then only player1 gets the msg

but not sure about your exact setup

but if its only visual thing, maybe server is not needed and client can call it themself

[upbeat hound]

that sounds like what I wanna do, but clientrpc is a c++ term, isn't it? Do you know the equivelant blueprint term?

[cinder quartz]

hmm not sure how to do it in blueprint exactly

[upbeat hound]

Well, if the player finishes uses the equipment, he gets an important item, the progress itself is not necessary per se..

[mystic patio]

I can help there. RPCs in Blueprint are very easy.

You'll probably want to use your character/pawn BP, or perhaps your player controller BP. It doesn't exactly matter which — it just depends on which you'd rather 'get' on the server side. But let's say you use the character/pawn, which would be my choice. The pawn walks into a trigger volume, right? So we have the overlap. That overlap will provide an actor reference, which you can then cast to your character/pawn class. You probably have this set up already. Now for the RPC part.

[upbeat hound]

Yess..

Looking forward to the RPC part 😄

[mystic patio]

(Just a simple representation of an extremely simple trigger volume setup)

[upbeat hound]

SetLooking(Forward)

[mystic patio]

And this is set up, for example, in your character/pawn class, in the event graph.

You can call your events whatever you want, but I recommend following the convention of prefixing Client_ for RPCs that execute on the client only. (There's also Server_ for server-only RPCs, and Multicast_ for multicast RPCs)

You'll notice that Client_RevealWidget event says, "Executes on Owning Client". The details panel for that event will let you change which kind of RPC it is (regular ol' events are not RPCs by default).

[upbeat hound]

I seee.. I've never got my head around hasAuthority

This is very helpful! I will try to implement it now

[mystic patio]

That simply means, "Is this code running on the server?"

Technically, if I remember correctly, that's not required for this example, since only the server is allowed to call Client RPCs anyway. But I think it's helpful to illustrate what the intent of the code is.

Of course, you would have an equivalent setup for the OnEndOverlap event to hide the widget component on the client.

[upbeat hound]

I seee.. yes that makes it clear. I've never used "on owning client" before

Okay I'll try to implement this now

one thing though, another problem now is that progress bar only increases on the server not on client

But let's see, maybe with this new setup it works ^^'

[mystic patio]

That's a little easier to solve. We can tackle that when you're ready.

[upbeat hound]

(I have progressBar binding to a var that is replicated)

[mystic patio]

Oh. Well, that was gonna be my suggestion.

[upbeat hound]

Yeah I'm not sure why that doesn't work, but let's see!

Thanks a ton!!!

(more like mega tons)

[mystic patio]

Sure thing!

[upbeat hound]

Hmm, just a question

So you said the RevealWidget stuff should be in the character/pawn class, right?

[mystic patio]

I suggested that because that's the actor that is overlapping the trigger volume, and I thought it would make it easy to set up the code that way. It doesn't have to be, though.

[upbeat hound]

Now in my multiplayer setting, I have the following:
"ClientSide_Controller" (Player), "ClientSide_Pawn", "ServerSide_Character", "ServerSide_Controller" (AI)

Most of my logic of sending things is in ClientSide_Controller

(I got this setup from a tutorial on youtube)

[mystic patio]

Those are BP class names you listed?

[upbeat hound]

yes

[mystic patio]

So you have two pawn classes (one for server, one for clients) and two controller classes (same story)?

[upbeat hound]

one pawn on the client, and one character for the server

[mystic patio]

Well, characters are pawns, so I was summarizing I guess.

Interesting. I'm not sure what your project's requirements are, but that's not a setup I'm familiar with.

[upbeat hound]

Oh right

Well I was following this tutorial

https://www.youtube.com/watch?v=QafPkgBFE3I

I just wanted a multiplayer version of the topdown template in ue4

[cinder quartz]

you can think it this way: server has world with pawns, actors etc, and each client has copy of that world, there is server version of player 1, and each client has their own version of player1

then depending what you call, server rpc, client rpc, multicast, is where stuff happens

[upbeat hound]

I see...

[mystic patio]

Yeah, that's what I'm familiar with. And each instance of each actor (be it pawn or whatever) stems from one class each.

[upbeat hound]

So the code you told me earlier should be on the clientside pawn?

[mystic patio]

One consequence of this is, you can do actor comparisons across the network really easy. It's just a simple == node.

[cinder quartz]

its just one blueprint

[mystic patio]

I guess? The expectation was that the server and the client would have their own instances of the same actor.

[cinder quartz]

but server runs that code he posted yes

[mystic patio]

I guess? The expectation was that the server and the client would have their own instances of the same actor.

[cinder quartz]

but server runs that posted Savvy posted

[upbeat hound]

Oh.. but in the setup in the tutorial they seem to be separate

[mystic patio]

I haven't watched that tutorial, so I'm not sure the reasons why they set it up that way.

[upbeat hound]

I see.. I will try that then.

[mystic patio]

But I can tell you this much: you definitely don't have to set it up that way to get networking working nicely.

[cinder quartz]

also for replicated variables, there needs to be server instance that changes the variable, then all clients get the change

[mystic patio]

Exactly! That probably explains your progress bar replication issue.

[upbeat hound]

Ohh maybe

[cinder quartz]

once you get the hang of it, it's a really nice system in UE4

[upbeat hound]

I hope I get the hang of it fast 😄

I'll try this out and report back 😃

Okay! Good news and bad news

Good news is, when I run two clients (dedicated server) it works nicely!

Bad news is, when running not deticated server (one server and one client), everyone sees the widget when it's visible

Should I care about the not dedicated server setting?

[mystic patio]

Seems like the server is also running the client-only code to reveal the widget.

Might want to double check your code setup. I'll gladly take a look if you can share a screenshot.

[upbeat hound]

Sure! One sec

So this is defined on Character (class called ServerSide_Charater)

And these are defined on an actor class called Equipment:

"Equip to use" is set somewhere else (when player clicks on equipment to start moving towards it)

[mystic patio]

Hm. Question: if you set up a non-dedicated server game (like you were just doing) and walk up to the equipment using the client, does the server see the widget too?

[upbeat hound]

yes

let me show a screenshot

Using equipment with client

using equipment with server

btw, the print string prints "Server: is using!" "Client: is using!" when either side uses the equipment

[mystic patio]

That the print-string is showing up is not surprising. That's just being called on the equipment actor anytime a pawn walks in, regardless of whether that happens on the server or client.

But as for the widget showing up on both every time, I'm not sure. I'm not seeing the problem right now.

[upbeat hound]

Hmmm

[mystic patio]

Maybe someone with fresh eyes can take a look at the problem.

I have to get going anyway. Sorry to leave you hanging. (Running a play-test of our game in a little bit!)

[cinder quartz]

when someone walks to the trigger, it happens in all clients, so they all trigger the overlap and all show widget

[upbeat hound]

no problem! You've helped a great deal!

Ohh

[cinder quartz]

I think easiest thing is just leave the overlap like it is, but Cast that actor from overlap node to your character, then get playercontroller and check if its locally controlled

at least that should work

oh wait, dont do that actually

[upbeat hound]

oh

Why not?

it sounded logical 😮

[cinder quartz]

do the charadter part but forgot player controller

because only server and owning client has player controller

maybe character has node called Is locally controlled, i think it has

so dont need player controller

so actor -> cast to character -> is locally controlled -> branch -> your widget logic

from the overlap event

[upbeat hound]

Let me try that 😄

[spiral fulcrum]

whats up I gota question to ask, if Im replicating a client shooting at an enemy and the projectile is hitting the enemy blood comes out etc but the enemy doesn't die as he should is the issue with replicating the projectile or in the enemy death event?

[upbeat hound]

Hmm.. it's not working for some reason

When I use the equip with server, widget appears on both server and client.
When I use the equip with client, it doesn't appear anywhere

[high current]

Peng, could be both, check if the pawn is recieving the damage correctly if it is, then it is your death event

If not, then it is the shooting

[cinder quartz]

FifthKira, not sure what to do next then. Maybe try do really basic overlap thingie and try just get it to print on server only, then on client only, with branch and switch has authority

[upbeat hound]

switch has authority means it will only print on server, right?

Okay, I'm trying something now.. I hope it works

[cinder quartz]

yes, switch has authority means its on server

[upbeat hound]

btw, when I'm not running a dedicated server,

does the server run the code two times, one as a client and one as a server?

[cinder quartz]

no, it runs it once and switch has authority is true since its server+client

[upbeat hound]

I seee

[limber mortar]

I was making my game in 4.19 source and am upgrading to 4.21

should I only put it in 4.21 source to package, or should I just continue upgrading the game in 4.21 source?

does it matter?

[viscid veldt]

anyone have a general idea of number of players possible without a dedicated server, like a regular shooter game

[high current]

Like p2p?

Listen server

[viscid veldt]

yeah

[high current]

I would say no more than 12 for an ok experiance

But it warrants testing with your game

[viscid veldt]

so i would have to a lot of work to get like 30+ players to work well with a listen server/non decicated server setup

[high current]

Every game is different

But you would need a lot of work to get that working on dedi as well

[cedar finch]

If your game is like a 2d Tetris battle royal you might be ahite.

😉

[high current]

I am basing my guess based on call of duty

As there is a reason for the low player count

And I am guessing that since you are soing p2p

Anyone can host

Therefere you have to build your networking around the worst possible host

I am also speculating that some routers would just clock out after some number

Skip packets and so on

But I might be wrong

[viscid veldt]

no worries i was just googling and didn't find much of an answer

i'll be diving into multiplayer side of things soon

and was just wondering what was already possible

[cedar finch]

It's a pain in the butt sometimes but it's cool when it finally works

[viscid veldt]

yeah i realized if i really want to attract attention/money, i'll need to start learning multiplayer

[high current]

Obviously ue4 now supports 100 player games

With the release of Fortnite

[cedar finch]

Fortnut

[high current]

There is the replication grapg

But i have no ideq how that is handled or even if it is on listen

[viscid veldt]

yeah but assumed all the high player counts are using dedicated server to manage the players

[high current]

The host's pc would have too much stuff to compute

Whilst allowing the host to play

Cause that is the issue with p2p, if the host lags

Everyone lags

Server tick isnt consistent because it is the players fps and so on

Regardless, the only way to find out

Is to try

[viscid veldt]

yeah i had a thought while i was on a long drive today, to somehow split up the hosting between the players

of course i'll have to learn more before i can even see if thats possible

[cedar finch]

I've played with 4 players, one in California, one in Texas, and 2 in Georgia. We tested my game with 100 enemies on screen at once and nobody had any lag. Now I had to do a lot of tweaking to my blueprints to get it replicating efficiently. At first it lagged but I got it stable now

[viscid veldt]

thats pretty cool

[cedar finch]

It's a good feeling when it actually works and you see your friends running around shooting stuff lol.

As far as I know I only have one problem left to fix that I can't figure out.

[shut gyro]

Agreed, the first time you get multiplayer working on servers it is a life-changing moment lol

[limber mortar]

It feels good

I've had my friends fly helicopters with me

Trying to get the bugs worked out from an update and the latest round of testing

I got to figure out why this stack overflow happens

upgraded from 4.20 to 4.21 😄

[cedar finch]

Maybe you guys know what's going on in my game. So I start a session and open the "Lobby" map. Then clients connect to the "Lobby" map and then the host starts the game and everyone travels to the "Game" map. My issue is when the host clicks the "Return to lobby" button in a widget, The OnSwapPlayerController event doesn't run and he's in the Lobby but still has the player controller of the previous "Game" map. Wierd thing is it only does this when testing outside my local network. I test it with my self and everything runs fine. My desktop and laptop return to lobby and all it good. But testing on the internet doesn't seem to work. Ideas? https://i.gyazo.com/859ac91dd0689ed55def0f9958f9dd08.png

[limber mortar]

My players connect a little differently Its a dedicated server game, and from a widget join games opens a level to the IP address of a server rotating levels

have not done much with sessions yet

[cedar finch]

Yea this is just a servertravel the host executes to go back to lobby

[limber mortar]

what's your game about again?

[cedar finch]

Killin zombies lol

[limber mortar]

Luv zombie stuff

I did a non violent/combat coop for my first project

[cedar finch]

Nice! This is my first "real" project. I've started several that never got finished but they were single player so I deciced to create this

I got an idea for testing. So since it works on LAN but not on internet. I'm going to use my phone as a hotspot and connect with my laptop then test with my desktop

so the two should connect through different networks and maybe I can recreate this but and fix it. It's hard to fix what you can't recreate

[limber mortar]

nice I started one and have just been working on it for a year

Its taken a lot of tweaking to get working right on multiplayer

[cedar finch]

Yea same I started this multiplayer project a year ago as well. It's been a lot of learning and headaches getting it all working but It's fun

Ok so this is wierd. So I test multiplayer with my deskop and laptop. If my desktop (with wired connection) hosts and returns to lobby, everything is fine. But if my laptop hosts and returns to lobby, The host never executes the SwapPlayerController event so the Lobby never gets setup correctly and the host has all the widgets from in-game on his screen. Both players make it to the lobby so that's a plus I guess lol. Hmmmmm

https://i.gyazo.com/3d08140603175e8339f08760add86c8f.png

Does this look right? The widget calles this event

[jolly siren]

Does anyone know of an efficient way to replicate FQuat?

[limber mortar]

I feel ya whippy

[winged badger]

@jolly siren it can go into Rotator and back, and it can use compression for Rotators

[winged badger]

if its in a struct and you override NetSerialize, you can just turn it into FRotator if you're saving and serialize the FRotator (compressed or not), and if you're loading you deserialize the FRotator and turn it into FQuat

[tired juniper]

Hi.
What's the best way to make clients setup some own local information that can be shared later with others when enter to a session. For instance: Player name, skin setup, etc.
I thought about storign that in the local gameinstance and then when joined to the session the client would tell the server "hey this is my info", but.. it's not working for me.
is there any other way?

[winged badger]

as long as client RPCes that, it should work just fine

[karmic briar]

https://gyazo.com/7ec64e0192637bcd43cef794db9bf7b7 https://gyazo.com/532007b0ee450b4a899bff030abcfb44

anyone can help me with these
having problem with this currently modifying my replication graph

[thin stratus]

@karmic briar Are you including the APlayerState header?

[karmic briar]

yeah i do

i just finished rebuilding as well and still got the error

[karmic briar]

@thin stratus hey i just rebuilding a second time and yeah u right the APlayerState header did fix it idk why the first time didnt pick it up

and thanks for the suggestion

[thin stratus]

Do Arrays always replicate as one?

Or does it replicate the adjusted entry only?

We have a bunch of stats that we keep track of during the game. Some of them have to instantly replicate, others at the end of the match and again others not at all.
The Stats are currently tracked in a TMap<FName, FStat> but that can't replicate of course.
Now sending an RPC for each time this has to adjust is kinda insane and also not nice for late joiners and stuff.

A TArray<FStat> with FStat getting an FName entry would solve the replication issue, but if the whole array of multiple stats replicates every time one entry is changed, then this isn't good either

Oh and with stats I mean things like Kills, Hits, Shots, DamageDealt with Weapon XY. So these are a lot atm

[void nest]

I made a custom movement system which replicates a transform variable using a multicast and a very small delay (as to not be frame dependant and cause badnwith flood on very high fps). The problem is that if about 10 players are in the game connected the transform replication becomes really slow causing the players to teleport. What is the best way to replicate a transform to get smooth movement with about up to 18 players?

the transform is already quantitized. I split everything up into ints which are also rounded, so in theory I think the data itself should be pretty lightweight

[thin stratus]

I wouldn't multicast the transform

Just mark it replicated

And make sure your RPCs on tick aren't reliable

[void nest]

Ok I'll try that thanks!

[thin stratus]

---

How absurd is it to have 4 TMaps + 3 TArrays for the different replications of stats?
One TMap for ServerOnly stats that never reach the client but only the backend.
One TMap and an OwnerOnly replicated TArray for UI related Stats that constantly changes.
One TMap and an OwnerOnly replicated TArray for UI related Stats that replicates once at the end of the match (could make this a ClientRPC).
One TMap and a "for all" replicated TArray for UI related stats that constantly changes (Kills, Deaths, etc. for Scoreboard).

That should keep everyone in sync and still make sure that we only replicate what is needed.

Kinda annoyed of managing 4 tmaps when modifying a random stat (cause yo ugotta check which map has the stat).

Tarrays would replicate with OnRep so I can just use the Tarray to fill a client-side TMap so I can still query the stats on the client via the hashed map.

[wintry dock]

mutliplayer is a headache

everything i dont expect to work works and everything i expect to work doesnt

[bitter oriole]

Multiplayer is hard and way more work than SP, yeah

[void nest]

Honestly, it's not THAT hard once you get a hang of the 3 main nodes you should use (RPC, multicast and on owning client) If you truly and deeply understand how those nodes work and if you are used to their usecases, it's in fact extremely simple

but it's indeed more work overall

and a bit more complicated, but i simply add a pre tag to my nodes i name all my RPC's (S_Dosomething), multicast (MC_Dosomething) and owning client (OC_Dosomething) and that keeps it nicely organized and easy to see how everything works with a simple glimpse at your code

[bitter oriole]

Yeah, there is nothing simple about creating physics vehicles in server-authoritative multiplayer

That the tools provided in UE are simple doesn't mean "making a MP game" is

[void nest]

ok, well I wasn't talking about physic simulations over network. That is indeed a major challenge.

But regular multiplayer systems aren't that difficult

[bitter oriole]

Something as common as shooting a gun over a network is nothing near simple

If you want something remotely decent

[void nest]

it depends on how complex you want your system to be. If you want serverside authorisation of each shot / kill it gets a bit difficult. But if you go for a straightforward serverside shooting mechanic it's simple. (it won't be very lag friendly though)

[bitter oriole]

That's not acceptable for a modern game really

[void nest]

true

you want clientside shooting with serverside authorisation and correction

which is more work and somewhat challenging but doable

[bitter oriole]

Yes, and at that point we are very far from "simple" territory

[void nest]

yes, but you can build your game up in layers. The way we do it is first implementing every mechanic as purely clientside with serverside replication. This isn't cheater proof at all and not recommended. But we then take each system we created that way for a second pass to add serverside correction

it's really no use building any mechanic the final way (with serverside correction / auth) just to find out the mechanic is shit and needs replacement

First build your game until it's fun and then optimise / protect

[bitter oriole]

Look, all I said is "Multiplayer is hard and way more work than SP"

I've got really no correction to make to that statement

[void nest]

it is, I agree

But my response was more in terms of how complicated it is. And as far as that goes it really isn't once you get the hang of basic networking principles

but yes it's obviously more work

[bitter oriole]

"if you're really experienced and only make stuff that it is easy to add MP support to and don't have physics or movable objects and only do MP once every feature is approved, it's not that hard"

I agree with that

But then again that defeats the point of not being that hard

For 95% of people here, MP support will be the most complicated feature in their game by a long shot

[void nest]

Your point is basically that networking is difficult when trying to replicate stuff that is already hard to make in SP games, physics for example are unreliable and very hard to get right. Translating this to a networked game does make it even much harder, yes.

But I mean if it was easy everyone would be able to make games in a jiffy 😛

[bitter oriole]

No, my point is that MP is hard, always.

[void nest]

it does take time and understanding

well, making a good game is hard

and it should be I guess, because that is hat defines a good game, the fact that it was hard to make

[bitter oriole]

Not really

[void nest]

if it was easy there would be to many clones of games with cheap mechanics and basically cheap games

To make a game interesting it so craft a game that has mechanics that haven't been done before (or combinations of things that haven't been done before) and that means creating stuff that you have little to no documentation for as nobody has done it before. And that is in a sense what makes a games good / refreshing

but it's not a golden rule of course. Reskins of existing concepts can in theory be good as well.

[bitter oriole]

We're purely in "this is my opinion on games" here and I have no interest in that discussion, so that will be the end of it

[void nest]

👍

[twin juniper]

Hey, I'm working on a multiplayer game, anyone knows why one of my players (always the first one) isn't replicated like the others? he can't look up or down and shoot further to other players, but when I use all of the other players its fine. thanks!

[cinder quartz]

Is there a callback or something after player joins game and is fully ready to go. Playerstate name replicated to others, pawn possessed etc.. Basically I need to spawn UI info for local player that includes other player's name. Now I'm just lazily doing it with timer and 3s delay in playerstate's BeginPlay. It works, but I'm scared it will break if someone joins with slow pc or bad connection. I tried using Playerstates OnRep_Name, but it simply doesn't work 100% of the time. Sometimes I get UI's per player without name, like the name isn't replicated yet, which doesnt make sense to me when I'm calling it on OnRep_Name...

[bitter oriole]

Basically check in Tick that every value you want initialized has non-defaults value, and then fire a method

With a simple bool to only call it once

[cinder quartz]

Hmm.. do you know whats the order of creating things? Like when someone joins, does it create controller first, then playerstate, then pawn and possess it, or ?

or are they all made basically at same "frame"

[bitter oriole]

I don't know, and it shouldn't matter

Pawn in particular will probably be last created

What I do myself is only start displaying the game after the player controller has everything it needs, pawn possessed and correctly initialized, etc.

[cinder quartz]

Because when I just create my UI for each player in BeginPlay Playerstate, it works, just the name is sometimes ""

Maybe I'm just thinking too hard, everything else works than the name if I dont put delay, I could just check the name with delay

[bitter oriole]

The problem with delay is that it will always be too short or too long

Just check every tick until you're ready

[cinder quartz]

yeah right now it's kinda annoying to see UI pop 3sec after someone joins

[bitter oriole]

{
    if (haveEverything())
    {
        callback();
        bCalledCallback = true;
    }
}```

[cinder quartz]

that looks good, if I put that in playerstate, I can even turn off the tick after that since it doesnt have anything else

shouldnt matter such a simple tick tho

[upbeat hound]

Hi vk, thanks for your help yesterday. I've been trying to fix the problem as per your suggestion, but it wasn't working, and now I think I might know why but not how to solve it

[cinder quartz]

Hey, just share with us, why you think its not working?

[upbeat hound]

So as I told SavvyIndoorsman yesterday, my setup is:
"ClientSide_Controller" (Player), "ClientSide_Pawn", "ServerSide_Character", "ServerSide_Controller" (AI)

My multiplayer setup is per a tutorial that explains that those classes do the following:

Now using this, all the characters are owned by the server

[cinder quartz]

yes but in the editor ClientSide_X and ServerSide_X are the same thing

The way its worded in that picture is a bit confusing

the engine will automatically make server version for server and client version for client

[cinder quartz]

yes, you dont need those

only one controller, one pawn/character

[upbeat hound]

This is how they made it in the tutorial

[cinder quartz]

that looks very strange to me

[upbeat hound]

Oh, well that is easier to work with indeed

(only 1 and 1)

The ClientSide_Controller is a child of AIController

[cinder quartz]

but I'm not familiar with that tutorial so maybe it has reasons to do it that way, but I know the "normal" way is just to use one thing for both server and client

[upbeat hound]

thus I can use MoveToLocation

while if it's a player, I can only use SimpleMoveToLocation, right?

[cinder quartz]

not sure, I use character for player and character movement component

not too familiar with topdown stuff

propably dont need character movement for that, but its already replicated and ready to go

[upbeat hound]

Do you happen to have a link for a tutorial that does this? (preferable for top down setting)

[cinder quartz]

I do not sadly, not sure which is the best first multiplayer tutorial

can't even remember what I did as first thing to get familiar with multiplayer lol

[upbeat hound]

xD

[cinder quartz]

if you have just normal character, check 2 players, it should already just work

opens another window and boths movements just work

thats how easy its with character movement component

[upbeat hound]

I read somewhere topdown template doesn't support multiplayer by default because of this "SimpleMoveToLocation"

[cinder quartz]

yeah propably wont work automatically

this is pretty good read https://docs.unrealengine.com/en-US/Gameplay/Networking/Blueprints/index.html

and this https://docs.unrealengine.com/en-US/Gameplay/HowTo/Networking/ReplicateActor/Blueprints/index.html

[upbeat hound]

Thanks! I will read them

[cinder quartz]

Also for multiplayer you might need to do "Add movement input" instead of SimpleMoveTo. Heres a picture when you scroll down https://answers.unrealengine.com/questions/48558/movement-replication-client-to-server-in-top-down.html

[upbeat hound]

Hmm, however it seems like linear movement

I mean it will not try to navigate around obstacles and stuff

However in "SimpleMoveToLocation" and "MoveToLocation", I just provide a world destination, and it tries to navigate there

[cinder quartz]

I guess it depends what kind of game you want, not sure whats the correct way to replicate movement with setup like that.

I know that if you have character and use behaviour tree(ai) to move it, it is replicated

Maybe the reason your tutorial has two different controllers, is because "player" is actually ai that moves with navmesh, and client controller just tells server to give it destination

a bit like strategy game where player can move many units

[upbeat hound]

Yeah, that's the structure I want

I won't be controlling more than one unit though

by structure I mean that I just give it destination and it moves with navmesh. If there is an easier way to do it without those 4 classes it would be cool 😃

[cinder quartz]

is the tutorial you were doing long? Maybe just follow it and see what happens, or did you already finish it?

[upbeat hound]

I finished it as a setup before I started working on the project, it's just 3 videos.

This guy has no videos on youtube except those 3, because he says he looked for topdown multiplayer solution and did not find, so he decided to make one

So I didn't say my suspicion earlier

Because the server owns the "characters" controlled by the AIControllers,

when I get BoxOverlap and run the widget stuff and call "run on owning client",

the owner is the server..

But for other setups, characters are owned by clients, right?

(Still reading through the networking link, half-way now)

[cinder quartz]

what you are trying to do isnt too hard to setup, just hard to explain through chat

[upbeat hound]

So you have an idea on how to do it better? 😃

[cinder quartz]

no, that sounds good what you are trying to do

I just have no experience with multiple controllable characters by one player

so maybe it's better I dont give bad advice lol

I have general idea how to do it, but no real experience

[upbeat hound]

lol, well one player would actually control one character only..

[cinder quartz]

oh sorry, I meant this : character is actually AI

how I move my characters is just AddMovementInput and it works fine

but they dont use navmesh

to dodge things like rocks on the way

[upbeat hound]

Ah I see

[cinder quartz]

but how I would start doing it is something like this: client sends server msg "I want this guy to move there", then server moves it and have the movement replicate automatically to client, at least character movement component does this

try do something simple first, send server a number from client, have server multiply it by 2 and replicate it back to all clients

general idea is the same with moving unit(s)

[upbeat hound]

Well now the units move nicely, after that tutorial players move flawlessly

My problem is the one I originally explained (showing widget only to the character (owned by server) overlapping box)

Hmm, I might have an idea

Let me try something 😄

[thin stratus]

@upbeat hound You need some sort of reference to the PlayerController of the player who controls the Pawns

So even if they are controlled by AIControllers, you need to save somewhere who the actual owner is

And if you mark that variable as replicated, then you should be able to simply check on overlap:

1. Is it valid (cause it won't be on other clients) and 2. Is it LocallyControlled

[upbeat hound]

I have a reference in the AIController to the PlayerController

[thin stratus]

Yeah then you already have everything you need

Just make sure the ref is replicated

[upbeat hound]

Oh I see.. the ref is not replicated

That's whyy.. I tried earlier to do this Overlapping Character> get controller (AI)> Cast to my controller class> get ClientPlayer Controller ref > check if it's locallyControlled

but didn't work, probably because it's not replicated!

Let me try 😄

[thin stratus]

Overlapping Character> get controller (AI)> Cast to my controller class> get ClientPlayer Controller ref > check if it's locallyControlled

This won't work

The AI Controller only exists on the Server

[upbeat hound]

Oh

[thin stratus]

You will have to save the ClientPlayer Controller ref in the Pawn then, sorry

You can save it in both

And just forward it OnPossess

[upbeat hound]

by Pawn you mean Character?

[thin stratus]

Yeah, Pawn is the parent class of Character

[upbeat hound]

Got it, will add a reference there

[upbeat hound]

Hmm

One question, right now I'm following this..

The Client widget is "run on owning client"

this code is on the character controlled by AIController (owned by server)

I should put this code on the PlayerController, and reference it from the reference I made recently right?

I mean, I should let the playerController make the call to the server, then the server would respond to it because it's owned by the player.

Am I understanding this correctly?

Okayyyy, I tried this, and it almost works!

So again, with dedicated server, it works nicely

With not dedicated server, it works from the client side

(if the client uses equipment, widget is only shown to client correctly)

if server uses equipment, widget is shown to BOTH server and client

which is strange 😮

[thin stratus]

@upbeat hound No need for any RPC

The overlap that you are talking about happens on every player

Cause the Character exists on everyone

You just have to filter

So as soon as the Player Controller, that you saved on the Character in a replicated varaible, has "IsValid" and "IsLocalController" true, you are on the client already

You can just reveal the Widget

[upbeat hound]

Oh I see

Hmm

But because using the equipment is important, the signal should be given from the server, thus the upper part with hasAuthority

After that should I call it other than on owning client?

[thin stratus]

UI should never do any authoritive work

So why would it matter

[upbeat hound]

I see.. I think I understand what I should modify now

Let me try 😄

[thin stratus]

Like, even if you client manages to show Ui where it shouldn't be, they shouldn't be able to do anything with it

Cause in the end it would still be something that happens on the server and the server always has the correct info

[upbeat hound]

Yeah, but the check that they actually overlapped and the event after it finished using the equipment would come from the server..

I'll try to incorporate it some how, but I understand what you mean

[thin stratus]

Well you can also fiter teh overlap for the server

and call a client rpc on the controller

but that introduces lag (cause well, hast to get to the client) and it would ultimatly be on the client again anyway

[upbeat hound]

Oh yeah.. Okay I'll try to make only key events replicate and all those only on the client!

Thank you so much! "I think I have better understanding of multiplayer coding now" (Thought this multiple times during the past 5 days, but I always turn out wrong, let's hope I'm right this time lol)

[light fog]

why does "Addworldoffset" not work when "ReplicateMovment" is true?

[upbeat hound]

It worked! The reason the widget kept appearing on the client even though the server uses the equipment is that for the widget, replicate component was set to true

Now it works as expected 😃 Thanks everyone for your helpful feedback and time!!

[maiden vine]

How do I set 2 different game modes boolean at same time? I have GM_Menu and GM_Master. I dont know where to call from to get all the game modes.

[brittle karma]

guys doesnt ue4 support Replicated TMap?

[bitter oriole]

IIRC no, unless recent addition

[brittle karma]

hell i should change the whole code now, it all was based on Tmap 😑

[high current]

@maiden vine what do you mean, you can only have one game mode loaded at a given time...

[hollow breach]

I'm trying to create auto attack feature for moba game. In this feature, when the player presses on attack button, the player needs to move automatically towards the enemy character and attack him. I tried using MoveTo and SimpleMoveToLocation on player character(server side), it's working on all other connected players except the local player controller. Could you please share your ideas to get this feature working?

I also tried with player controller sending commands to ai controller. Its working but the movements are lagging.

[long adder]

I'm having issues with a UMG component (healthbar) that i add on top of characters. They work great on the client side, but on the server side, all clients healthbars jitters and laggs like crazy. Even if i just add a blank UMG component that has no functionality

[high current]

you gotta share code screenshots or something. This could be caused by a multitude of things

[long adder]

It appears it was cause i had hooked the UMG component to the base rather than the mesh

So... don't stick the umg components to the capsule.. lol. Rookie mistake I guess?

Yep, confirmed... Now to the next bug I have. Clients can't execute "Destroy session", it fails every time

Only works on server. The widget is created from the playercontroller

[high current]

Clients cant destroy the session as it has been created from the server

clients can disconnect, but not destroy the sessiion

only the server can

the owner of the session

in a sense

[long adder]

How do I make the client disconnect?

Or do i have to tell the server to destroy the session of the client perhaps

[high current]

IIRC you needed to just load a new level (main menu) on the client, and immediately after that call destroy session on client, so that next session connect/host works properly

[long adder]

Alright, I'll try that thanks 😃

[worthy wasp]

I"m trying a new approach on my design - running inputs from the controller instead of the character class.... however i'm having some problems with even jus ta simple jump.....

I have controller (local funct) that runs a local funct in Character (BeginJump()) which calls a SRV RPC - setting a RepNotify boolean. OnRepNotify fires off this->Jump().

Print strings are printing out as i'd expect them throughout the chain - but the player isnt jumping.... i get the debug string on all attached PIE players.... so replication is happening to my view. Anything i'm missing?

[fickle pond]

Would anyone be fine with joining in on a call and explaining exactly how multiplayer works in ue4

[winged badger]

@fickle pond http://cedric-neukirchen.net/2017/02/14/multiplayer-network-compendium/

[fickle pond]

Correct answer would've been a no lol. Not really looking to read a 200+ page pdf

unless I cant fnd anyone to explain lol

[winged badger]

yeah, not likely someone will talk you through it over 2 months time, either 😛

[fickle pond]

well at least the basics is all im looking for

[winged badger]

the basics are in the compendium, the very basics

networking with unreal isn't easy, there are no shortcuts

[fickle pond]

idk i find auditorial learning seems liek a shortcut compared to reading

[worthy wasp]

"networking with unreal isn't easy, there are no shortcuts"

Understatement of the century

FWIW - i found out that you call Jump() locally - its replication is handled in engine side

[fickle pond]

Well if anyone is interested for a payment for tutoring on networking in Blueprints

[worthy wasp]

hope youre up for a hefty payment - i'm on almost 4 years bud - still have daily hangups with it

[fickle pond]

just basics not the whole shabang

Mainly concepts*

[worthy wasp]

read that compendium - it is the basics (and free to you)

pay cedric later

[fickle pond]

the hell is cedric

[worthy wasp]

did you even look at that link he sent you earlier?

hes the author

[fickle pond]

I know the compendium

oh I dont pay attention to naems

not a good name guy

[worthy wasp]

good to know.

[fickle pond]

plus im there for the compendium not the author

[worthy wasp]

atypical

[fickle pond]

? how so

[worthy wasp]

jus ttrollin bud lol

[fickle pond]

mkay, well if anyone is interested in payment for tutoring on working with simple networking through discord id be glad (message me through discord preferably)

[naive crater]

Has anyone had any luck with getting camera anims to work after a servertravel?

[inner pumice]

hey just wondering what would be the "correct" way to get a reference to all the current player pawn positions on the client? I'm trying to make HUD markers for the other players, currently sending an array of all the player pawns via RPC, but it only works some of the time... It's as if the pawn references being sent aren't always valid when they get to the client?
Surely there must be a simple way to do this, reliably?

[naive crater]

I use my gamestate to track an array of my players and just read from that array with my hud

rather than sending it with an RPC, not sure if thats the best way of doing it, but it's been working without performance issues.

[inner pumice]

hmm, so then how do you find the actual current position of the pawn? currently i'm using GetActorLocation on tick to update the markers positions... so i need a reference to those actors for that

[naive crater]

yeah so lets say my Variable array is called "Players" i would Get Gamestate > Get "Players" and do for each loop with a validity check > Get actor location.

Now i wouldnt run that on an event tick, instead using something like a 1 second timer and just using an event tick to lerp the visual feedback to the player.

[inner pumice]

hm, so you just have an array of players' currently controlled pawns in the gamestate? i have essentially the same thing, except it's in my game mode

it has to be on tick because players can move every frame... the marker has to be updated every frame... i'm using ProjectWorldLocationToWidgetPosition to convert the 3D world position of the actor into 2D screen coords for my widget.

[naive crater]

The problem with game modes, is that clients cant see it.

[inner pumice]

yeah that's why i just replicate that array of pawns to the clients with RPC

[naive crater]

If you can get away with doing it on event tick and don't suffer from performance than do it 😃

The advantage to reading the variable from the client over sending it, is you can always reference the variable but you have to wait on RPCs

That's just my 2 cents though so i would take it as just a suggestion 😄

[inner pumice]

well i have it setup so that when the RPC is called, it refreshes the markers on the clients... for eg when a new player joins, etc

it's just really weird that my array of pawns all seems fine on the server, but when the clients try to use GetActorLocation on them, it doesn't always work 😦

[thin stratus]

@fickle pond This kind of stuff is for #looking-for-talent

We don't have an audio version of #old-rules, so please read them.

[fickle pond]

how do I post in #looking-for-talent

[thin stratus]

That's also posted in #old-rules. Check the pinned message in the #looking-for-talent channel.

[fickle pond]

ok thank

[thin stratus]

@worthy wasp Why are you controlling the Char through the PC?

The only reason I could see is you having more than one Character to control at once

OOP (C++/BP/etc.) are kinda based on the idea that every object mostly deals with its own stuff.
So if the Character needs to move through input, then in 99% of the cases it's the character that should be listening to the input.

Of course it's not bad to do it in the PC, it should still work.

I have controller (local funct) that runs a local funct in Character (BeginJump()) which calls a SRV RPC - setting a RepNotify boolean. OnRepNotify fires off this->Jump().
You don't need to RPC for jumping. At least if you really have a Character with a CharacterMovementComponent.

If you call the Jump function on the owning Client, it will set a flag in the CMC and send that via RPC to the Server already.

[twin juniper]

It seems that replication graph removes or mitigates the cpu overhead when figuring out if something should be replicated to a player or not.
Is it just using IsNetRelevant in a way? or is it event based that when something changes in an actor it notifies the graph?
Haven't dived into it too much just wanted to know if the graph takes variables of an actor to determine this or other magic involved.

[fluid prawn]

Hello all, I was wondering if I could post a Useful PDF I've created to outline the Networking Model for the Default Character Movement Component Class. I created a sequence diagram that outlines the order of calls and how the flow of movement information is replicated and predicted. I've seen time and time again people asking question in here about it. The source code is overwhelming for most beginner programmers. New people trying to modify it and have it networked is quite the task. So I figured I'd make a diagram illustrating this to save people the pain of Ctrl Clicking and tracing through it to get a general idea. Here is a link to the PDF https://github.com/staticJPL/UE4SequenceCharacterMovement

[winged badger]

i haven't dived into it yet as well, but i do know it does not call IsNetRelevantFor @twin juniper

[fluid prawn]

Let me know what you guys think of the sequence diagram I basically outlined the most important functions considering there are some helper functions nested that are not relevant unless you need to modify them specifically. But the function calls and the order is important to follow if you're doing any custom movement overrides, this should help tracing the flow of modified data from client to server easier to see.

[winged badger]

i do like the effort, only i am finding it somewhat difficult to read, and i am familiar with the CMC flow @fluid prawn

for me, it would be a useful reference point, combining it with what i remember

i think a beginner programmer would get lost in it tho

[fluid prawn]

It is a sequence diagram

so maybe some background of what a sequence diagram is would probably be needed

you read it top down

in order

the end has a legend that outlines kinda what the objects mean

[winged badger]

legend ontop would be a UX improvement imo

[fluid prawn]

haha ok

[winged badger]

less scrolling while you get adjusted reading through ClientServerMain

[fluid prawn]

I can move that

right now

[winged badger]

it is a useful reference 😃

[fluid prawn]

it personally had to do it

to wrap my head around it

i literally was ctrl clicking and trying to stuff all that information in my head

did not work out too well

[winged badger]

because its a 10k lines bloated monstrosity

[fluid prawn]

yes

The good part is

the diagram

rips out the functions that are netcode only

and shows the order of calls and the flow so if you change something on the movement side

you can trace it or add to it in the same order

https://github.com/staticJPL/UE4SequenceCharacterMovement/blob/master/UE4MovementNetCodeSequence.pdf

done

Cheers guys hope you guys make good use of it

[worthy perch]

Thanks for this, jpl.

[grizzled stirrup]

I'm recreating AGameMode / AGameState to better understand how they work (not the base versions) and I'm curious about the DefaultTimer() function in AGameState which increments ElapsedTime once a second

It seems ShooterGame implements a very similar DefaultTimer() function, but instead in the ShooterGameMode and uses it to set RemainingTime on their ShooterGameState

This means that they are essentially ignoring ElapsedTime and the timer in AGameState is just running and not being used as far as I can see (In the case of ShooterGame). Is this just out of convenience as they needed a decrementing timer instead of an incrementing one? (though they could probably just subtract ElapsedTime from whatever their initial RemainingTime value is)

Would it be acceptable to just have a DefaultTimer() function running on the master GameMode instead which drives both the GS time and handles any GM specific events, rather than having the AGameState timer being largely unused and the GM one being essentially re-implemented identically?

[winged badger]

It would

Best think of GameMode as very rough guidelines

then actual set in stone code

[grizzled stirrup]

Many thanks!!

[covert gorge]

Could anyone help me with one problem? I have a possessable pawn that is not possesed by anyone at the beginning. If one player possess it, it works perfectly and Local ENetRole is ROLE_AutonomousProxy. However, if that players stops possessing it an another player starts possessing it, even thought it register server RPC correctly and inputs, if i print "Local ENetRole" it shows ROLE_SimulatedProxy.

Does anyone one why?

[thin stratus]

@grizzled stirrup We are doing the same thing. Our GameMode default timer does all the heavy lifting of managing the game.
The DefaultTImer in the GameState on the other hand takes care of decreasing the remaining time.

[real yacht]

After ServerTravel, my client crash

and i have this log

[2019.08.13-13.22.07:508][839]LogWindows: Error: Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:Runtime\Core\Public\Containers/Array.h] [Line: 611]
[2019.08.13-13.22.07:508][839]LogWindows: Error: Array index out of bounds: 7 from an array of size 0

how can i debug to see which array is problem, because with this log, i don't have f*** idea where to look at

[rose egret]

how do I replicate some properties only to specified clients (my team)

?

[barren kernel]

@tahirsle you need the callstack to see why the problem happens. Attach debugger before the crash and it should break when you have your problem.
If you can't get that, maybe there is some other logging above this to give some clue. What array of size 7 do you have?

[real yacht]

@barren kernel i will try to attach debugger, i'm trying to find through project which array, but i can't find it

and this is happening only after servertravel, because i want to restart current map

with all connected players

[fiery geyser]

@rose egret The only way I know about is through a Replication Graph. Otherwise you could always change your logic. Someone else, please correct me if I'm wrong.

There is also DOREPLIFETIME_ACTIVE_OVERRIDE by using DOREPLIFETIME_CONDITION(AActor, variable, COND_Custom); see https://www.unrealengine.com/en-US/blog/network-tips-and-tricks, but i'm sure this won't help you.

[rose egret]

afaik its per actor not per connection

I tried overriding IsNetRelevantFor but it for the whole actor's properties

what I am working on is teaming and team info (imagine a game exactly like ApexLegends)

[royal isle]

@rose egret the only way to do this is make your own replication graph and in that create a node for team only relevancy. Since the rep graph works class by class you should then need to wrap all of your team only properties in a separate component and have that rep to only team members

[rose egret]

there are 200 users and in the lobby they select their hero and magics

atm I am storing them on PS.

[fiery geyser]

You can always check this, see how they did it. https://github.com/DaedalicEntertainment/ue4-replication-graph/blob/develop/Source/RepGraph/Private/RTSReplicationGraph.cpp#L86

[royal isle]

There is also a Replication Graph implementation for shooters in ShooterGame

[rose egret]

🤔

it seems I have to learn RepGraph soon

my brain is F** up at the moment .

[royal isle]

Well then it should be really fun cause the Rep Graph is one of unreal's hardest concepts and APIs xD

[glass plaza]

Does anyone know why my camera is not pointing the correct direction on the players? I attach the camera's actor to another actor, check the location, it's in the right position. I check the camera, correct position. I SetViewWithBlend with the actor containing the cinecamera, it points from 0,0,0

[covert gorge]

I just managed to fix my problem, thank you anyway

[rose egret]

is it possible to move a replicated UObject to seamless travel?

for some performance and readability reason I want to remove my teaminfo properties from PlayerState and create a separate replicated UObject named UTeamInfo.
this object is filled in when players are at lobby map. and each PlayerState has a pointer to it.

[thin stratus]

Teeeechnically they should survive if the Actor they live in survives

Ah, just make a ATeamState

Not UTeamState

[rose egret]

is it possible to moved those UTeamInfo object to game map?

[thin stratus]

And base it on AInfo, like PlayerState

Not sure, but you can move the TeamState

As AInfo Actor

That's basically what UT does

[rose egret]

🤔

[thin stratus]

And we internally too

class HOVERLOOP_API AHLTeamState : public AInfo

void AHLGameMode::GetSeamlessTravelActorList(bool bToEntry, TArray<AActor*>& ActorList)
{
    Super::GetSeamlessTravelActorList(bToEntry, ActorList);

    ActorList.Append(TeamStates);
}

[rose egret]

hum thnaks

I got it

😐

[thin stratus]

The PlayerStates, if they reference the TeamStates, will probably keep referencing them

Just be aware that if you reference them in the GameMode

Like we do with the TeamStates array

that you will have to get them via GetAllActorsOfClass or similar

Cause the GameMode does not survive

So the Array is cleared

[rose egret]

🤔

[thin stratus]

// Check if we already have teamstates from a seamless travel
int32 NumFoundTeamStates = 0;
for (TActorIterator<AHLTeamState> It(GetWorld(), AHLTeamState::StaticClass()); It; ++It)
{
    AHLTeamState* TeamState = *It;
    if (!TeamState->IsPendingKill())
    {
        TeamStates.Add(TeamState);
        NumFoundTeamStates++;
    }
}
if (NumFoundTeamStates > 0)
{
    UE_LOG(LogHLTeams, Verbose, TEXT("[%s] Found %d TeamStates from last round."), *GetName(), NumFoundTeamStates);
}

That's in the GameMode, before creating TeamStates

I check if we have some that survived traveling

[rose egret]

@thin stratus could u please send me header of AHLTeamState?

[thin stratus]

@rose egret Can only send small pieces :P it's not directly our project

Any reason you need that?

[rose egret]

small piece of code is enough

how do u keep list the team's players

[rich ridge]

Hey guys

I have small question

Can anyone answer

I have CustomeMovementComponent and CustomePlayerController,
And both can have authoritive control.

So which one is better in terms of replication, latency and bandwidth

Input can be setup in either movement component or playercontroller

[thin stratus]

@rose egret PlayerState has a TeamState pointer.
TeamState has an array of Controllers and PlayerStates.
TeamState has an ID.
Every actor that needs it has a "TeamInterface" that has functions such as "GetTeamID" or "GetTeamState".

[rich ridge]

So where to setup

[thin stratus]

PlayerController is not for Authoritive Online Movement

[rich ridge]

Ok

So I can setup input in Playercontroller

Which can be authoritive

[rose egret]

@thin stratus
after seamless travel pointer to PlayerStates and Controllers become invalid so u re construct them again?

thats what I wanted to prevent

[rich ridge]

I m understanding little bit, so I think I need both custom movement and player controller right @thin stratus

[high current]

@rose egret perhaps take a look at the CopyProperties overrides on the Player State and player controller, there you can keep stuff between server travel iirc

[grizzled stirrup]

@thin stratus Regarding the timer thing, is there any reason to have two timers running when the GM timer can simply decrement the remaining time on the GameState as well as the other management of the game? Similar to the ShooterGame implementation. Since both are just functions running once a second it seems a bit simpler to do it all from the GM timer? In my case I'm writing my own versions of AGameMode and AGameState so I can completely remove that timer in the GS if it makes things cleaner

[high current]

I would imagine the reason for the timer to be in the game state is so that clients have access to its replicated version, no?

[grizzled stirrup]

No because all that matters is the time property which is replicated (GM sets the GS time property which is replicated to clients)

Only reason of having two timers that I can think of is if they run at different rates

OR only the initial time is replicated (COND_InitialOnly) in which case the client could indeed update the time locally from the GS

[hollow breach]

Hi Guys, I have question, Is it possible to achieve replicated AI MoveTo functionality in player character ?

[high current]

If your character has replicated movemetn, running the AI move to on the server will result in what you want

AI commands by default are always executed on the server in MP games

@grizzled stirrup IIRC in UT's case, GM and GS had different timers ,but I think that is what exi was saying

[hollow breach]

This will support client side input as well?

for eg: Kind of auto attack for moba ..where player can control their character and whenever the player presses attack button, player needs to move to target automatically...

[rich ridge]

@hollow breach what you are saying is u need GAS

GAS supports replication

@hollow breach In GAS if you assign your AIController to player character, it should work

All your movements should replicate regardless of AI controlled or player controlled

[thin stratus]

@grizzled stirrup The Timer in the GameState runs on Clients too.

We only replicate the Time every 10 seconds

No need for an int to replicate every second if the client can simulate this mostly

@rose egret PlayerStates survive by default.

[hollow breach]

I'm not familiar with GAS....I'll check that @rich ridge Thanks

[grizzled stirrup]

Makes sense thanks a lot

[thin stratus]

The TeamState pointer in them can be moved from old to new playerState via OnCopyProperties.
The stuff i was doing is located in the GameMode, cause that one doesn't survive.

@rose egret

[grizzled stirrup]

In the case where you had time being paused frequently (such as in between rounds), would it be acceptable to just replicate the time once a second and do it all from a single GM timer?

[thin stratus]

Well, it's all acceptable in some way I guess.

[grizzled stirrup]

I'm just looking to simplify as much as humanly possible even if it means a bit of wasted bandwidth

[thin stratus]

We have 180 seconds of match, + a few 3-5 second countdowns

And a 40 seconds post match + 10 second map vote.

So all in like 4 minutes of timer

So instead of 240 replications, we do 24

• the initial replication when a timer is setup (e.g. from Countdown to 180 second matchTime)

[grizzled stirrup]

Nice much more efficient

I'll definitely consider switching to that method if it becomes an issue

Though with things like rapid fire weapons always going off etc., that little replicated int would probably get sent with regular packets right?

[rose egret]

cant u use synced clock?

[thin stratus]

e.g.

// Everyone
const int32 OldRemainingTime = RemainingTime;
if(SomeConditionForReducingTheTimer)
{
    RemainingTime -= 1;
}

// Server
if(Role == ROLE_Authority)
{
    if(RemainingTime != OldRemainingTime)
    {
        if(RemainingTime % 10 == 9)
        {
            ReplRemainingTime = RemainingTime;
        }
    }
}


// OnRep of ReplRemainingTime
void AYourGameState::OnRep_ReplRemainingTime()
{
    RemainingTime  = ReplRemainingTime;
}

@grizzled stirrup

[grizzled stirrup]

Nice that's very elegant

Love the % approach

Thank you for the example

[thin stratus]

It's not the 100% exact code, but that's the idea basically

[grizzled stirrup]

Final super quick q: you shared a snippet overriding MatchState for some custom states you had for your specific derived modes, is the correct way to add more states to the MatchState namespace to simply have the same code as the AGameMode.h / .cpp but with your new additional states?

And would this be the best approach to add in some states that'd happen in between InProgress and WatingPostMatch? (Such as RoundInProgress / RoundEnding / RoundStarting )

[thin stratus]

The comment on it even says so

[rich ridge]

@thin stratus if I use CustomeMovementComponent and CustomePlayerController, will they be in sync or do I need to implement my own syncing mechanism

[thin stratus]

@grizzled stirrup ```cpp

/** Possible state of the current match, where a match is all the gameplay that happens on a single map */
namespace MatchState
{
extern ENGINE_API const FName EnteringMap; // We are entering this map, actors are not yet ticking
extern ENGINE_API const FName WaitingToStart; // Actors are ticking, but the match has not yet started
extern ENGINE_API const FName InProgress; // Normal gameplay is occurring. Specific games will have their own state machine inside this state
extern ENGINE_API const FName WaitingPostMatch; // Match has ended so we aren't accepting new players, but actors are still ticking
extern ENGINE_API const FName LeavingMap; // We are transitioning out of the map to another location
extern ENGINE_API const FName Aborted; // Match has failed due to network issues or other problems, cannot continue

// If a game needs to add additional states, you may need to override HasMatchStarted and HasMatchEnded to deal with the new states
// Do not add any states before WaitingToStart or after WaitingPostMatch

}

[grizzled stirrup]

Yes it says to override, is the correct way just copying what they have in the .cpp / .h and removing the existing entries and adding your own?

So for example:

[thin stratus]

Last line

[grizzled stirrup]

Yep that's the part that is confusing me

I'm not sure how to add in between

Without defining the same entries again

[thin stratus]

@rich ridge No diea what "CustomMovementComponent" is.
UE4 only has proper movement setup for Characters with CharacterMovementComponent

And these are the ones you usually extend if you need your character to do more

@grizzled stirrup The NameSpace doesn't give you the order

It basically means you shouldn't leave the WaitingPostMatch State for a custom one

Neither should you go from EnteringMap to a custom one

[rich ridge]

Custom means I m extending MovementComponent

[thin stratus]

Once WaitingToStart is hit, you can go to a custom one

[grizzled stirrup]

namespace MatchState
{
extern MYGAME_API const FName RoundStarted;
extern MYGAME_API const FName RoundInProgress
}

[thin stratus]

And before going WaitingPostmatch you can

[grizzled stirrup]

Something like that?

Ok so it's just purely on how you switch

Not the order itself?

[thin stratus]

namespace MatchState
{
    extern HOVERLOOP_API const FName CountdownToEndWarmup;            // Counting down before ending warmup
    extern HOVERLOOP_API const FName PlayerIntro;                    // Showing a lineup of the players before starting
    extern HOVERLOOP_API const FName CountdownToBegin;                // Counting down before starting the actual match
    extern HOVERLOOP_API const FName MatchEnteringOvertime;            // Match is entering Overtime
    extern HOVERLOOP_API const FName MatchIsInOvertime;                // Match is in Overtime
    extern HOVERLOOP_API const FName MapVoteHappening;                // Match is in Vote Map State
    extern HOVERLOOP_API const FName WaitingTravel;                    // While the client waits for traveling
}

You can just do this

It's not an enumerated list

[grizzled stirrup]

And a similar definition to that in the AGameMode .cpp?

[thin stratus]

namespace MatchState
{
    const FName CountdownToEndWarmup = FName(TEXT("CountdownToEndWarmup"));
    const FName PlayerIntro = FName(TEXT("PlayerIntro"));
    const FName CountdownToBegin = FName(TEXT("CountdownToBegin"));
    const FName MatchEnteringOvertime = FName(TEXT("MatchEnteringOvertime"));
    const FName MatchIsInOvertime = FName(TEXT("MatchIsInOvertime"));
    const FName MapVoteHappening = FName(TEXT("MapVoteHappening"));
    const FName WaitingTravel = FName(TEXT("WaitingTravel"));
}

[grizzled stirrup]

Ok so you just add to it and it'll now be part of MatchState

Thanks!

So you now have access to those entries as well as the ones before

And then it's up to you in the order you call them

[rich ridge]

@thin stratus Custom means I m extending MovementComponent

[thin stratus]

Yeah, there are some wiki entries about that

You don't need to do stuff with the PlayerController

@grizzled stirrup Yes, as said, not a list, just entries. The order you add them is made up.

You can go to any state.

I can go directly from WaitingToStart to MapVote

It's not set in stone

[grizzled stirrup]

Great thanks a lot!

I'll use mine inbetween InProgress and WaitingPostMatch

For a round based game

[thin stratus]

@grizzled stirrup

/** Overridable virtual function to dispatch the appropriate transition functions before GameState and Blueprints get SetMatchState calls. */
    virtual void OnMatchStateSet();

GameMode

void AGameMode::OnMatchStateSet()
{
    FGameModeEvents::OnGameModeMatchStateSetEvent().Broadcast(MatchState);
    // Call change callbacks
    if (MatchState == MatchState::WaitingToStart)
    {
        HandleMatchIsWaitingToStart();
    }
    else if (MatchState == MatchState::InProgress)
    {
        HandleMatchHasStarted();
    }
    else if (MatchState == MatchState::WaitingPostMatch)
    {
        HandleMatchHasEnded();
    }
    else if (MatchState == MatchState::LeavingMap)
    {
        HandleLeavingMap();
    }
    else if (MatchState == MatchState::Aborted)
    {
        HandleMatchAborted();
    }
}

So to continue this you would override, call super, and also do the same with your custom states

And make new Handle functions

[grizzled stirrup]

Sounds good so you'd start right away with more else ifs I guess after calling super

[thin stratus]

Yeah with a new if

We also override SetMatchState