#multiplayer | Unreal Source | Page 480

thin stratus Jul 23, 2019, 2:19 PM

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I would need to create this stuff myself

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Or atl east have access to that project

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Can't debug this from afar

pallid mesa Jul 23, 2019, 2:20 PM

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I know yeah. And I'm going to post it in a second (4.22)

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https://drive.google.com/open?id=1niv47UQoYqez7E-mgjsOejqrkycry8Ok

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80 MB

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ignore the name of the project lol

strong knot Jul 23, 2019, 2:22 PM

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is anyone familiar with the multiplayer shootout example proj from epic?

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i have a basic question, im curious how the clients are automatically connected to each other when using PIE with two clients. i guess my confusion is that wouldn't the clients have needed to first start @ a main menu widget and host or join a server? im looking for the logic epic used to autoconnect two clients but all i see is the usual logic for hosting/joining a session using widgets

does that only work in PIE, does anyone know? or is that something shippable?

pallid mesa Jul 23, 2019, 2:25 PM

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btw @thin stratus in case you dl the project I was doing this while we were speaking but It didn't save

📎 unknown.png

pastel totem Jul 23, 2019, 2:27 PM

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@strong knot This isn't specific to the shootout example. You can do this with every project in PIE. I don't think they implemented custom logic for the shootout example

high current Jul 23, 2019, 2:27 PM

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@pallid mesa ill try debugging on my end, but this was the bool I was telling you about

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📎 unknown.png

thin stratus Jul 23, 2019, 2:27 PM

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The Advanced Play Settings of UE4 have a "AutoConnect" setting

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That is on by default

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@strong knot

strong knot Jul 23, 2019, 2:27 PM

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wooow i thought i was going crazy for a minute

thin stratus Jul 23, 2019, 2:27 PM

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If you are testing 2 player starting from MainMenu, you would even want to turn this off

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Cause in the MainMenu they shouldn't be connected

pallid mesa Jul 23, 2019, 2:28 PM

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@high current right, but since it's movement none and then reseted to walking I doubted it would be necesary

pastel totem Jul 23, 2019, 2:29 PM

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@strong knot You can connect to an IP when starting a standalone game. That would result in the same thing.

high current Jul 23, 2019, 2:29 PM

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might be yea

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📎 unknown.png

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dood

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😄

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thats my bad

pallid mesa Jul 23, 2019, 2:30 PM

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rofl

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hahahha

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well thank you for downloading tho, I'm breaking my neck trying to see what is wrong there

strong knot Jul 23, 2019, 2:30 PM

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thanks @pastel totem and @thin stratus !!

thin stratus Jul 23, 2019, 2:31 PM

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@pallid mesa I'll look at it over the next minutes/hours

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Have to work on Hoverloop in the meantime

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Will fill the compile time with it

pallid mesa Jul 23, 2019, 2:33 PM

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okay, good luck in hoverloop, I'm going to try your suggestion of totally disabling the cmc (didn't work)

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while traveling

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which makes sense in a way

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also thank you so much y'all for all the input you are giving

meager spade Jul 23, 2019, 2:42 PM

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@pallid mesa initial attachment is replicated tho

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when i attach a weapon to my character, i do it owning client and server, but other clients see it attached fine

thin stratus Jul 23, 2019, 2:51 PM

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@meager spade Is your weapon using replicated movement?

marble depot Jul 23, 2019, 3:22 PM

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hello i have a quick question, is there any way you can get the steam server port the server is running on? i know you can get the ue4 game port, but i don't see an easy way to get the steam server port. any help?

brittle karma Jul 23, 2019, 3:25 PM

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guys for im implementing count down timer for my multiplayer game which i use cpp. cuz this is my first time working arount multiplayer i dont have a clear perception.
so here is what im gonna do if u have better idea plz share it.
im implementing the timer count down in Game State and send the Current time to a local class like Game Mode and with that i will be able to show the time on screen using Blueprint widgets

thin stratus Jul 23, 2019, 3:32 PM

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GameMode doesn't exist on Clients

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You can just get a replicated or simulated timer variable from the GameState in your Widget

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GameState is already the replicated class to share the start of the game

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@brittle karma

brittle karma Jul 23, 2019, 3:35 PM

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@thin stratus i tried that way but i failed casting Game state in BP, u said something about filling GameState Variable i didnt quite get that

thin stratus Jul 23, 2019, 3:36 PM

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You are accessing some "MyGameState" variable

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Which is never filled

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Only because you set the type of the varaible doesn't mean there is something saved in it

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These variables are pointers, which point to literally nothing by default

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You gotta learn that otherwise C++/Blueprints is gonna be a shitshow for you

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Instead of using your MyGameState varaible

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just do "GetGameState"

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And cast that

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Also don't create the UI in the GameState. Create it in the PlayerController locally (isLocalPlayerController with a branch on begin play)

steady tendon Jul 23, 2019, 3:37 PM

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Guys i have one little question. If i have a variable in the player state which is set to rep notify, and then the server modifies the value of that variable, is it the same to call a multicast event on the server pawn instance of that player state as calling a simple custom event in the pawn i get in the OnRep function of that variable?

thin stratus Jul 23, 2019, 3:38 PM

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Kinda

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Multicast is not a RepNotify

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Multicast is a fire and forget thingy.

brittle karma Jul 23, 2019, 3:38 PM

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@thin stratus aha thanks

thin stratus Jul 23, 2019, 3:38 PM

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If you call it and someone hasn't joined yet or is far away from the player, it will not call.

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At least if the Actor isn't marked as Always relevant

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RepNotify on the other hand will also call if players join late or come into relevancy

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As the variable gets replicated then

steady tendon Jul 23, 2019, 3:39 PM

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So its better to use the OnRep

thin stratus Jul 23, 2019, 3:39 PM

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If you need to replicate some sort of state, yeah

steady tendon Jul 23, 2019, 3:39 PM

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The thing is that it doesnt work as intended

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I just have a widget component in my characters that displays the player name. So in the player state i created the PlayerName variable. Then when the OnRep_PlayerName is called, what should i do to update the widget to display the new name in the other clients?

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I mean, the other clients can see the new name of the player

thin stratus Jul 23, 2019, 3:42 PM

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That's a simple race. Your PlayerState and your Character don't exist at the same point.

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So you'd want to do it basically twice

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Once from PlayerState OnRep to Character

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And once in the Character grabbing it from the PlayerState

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Not on BeginPlay though, as that's not valid

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PlayerState is only valid once the Character is possessed

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And then also only if replicated to client

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Which is why I always advice you all to learn C++ for Multiplayer games, cause UE4 lacks tons of functions in BP

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C++ has a simple OnRep_PlayerState in pawns/characters

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Perfect place to grab it

steady tendon Jul 23, 2019, 3:45 PM

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I dont understand what you wanted to say here "And once in the character grabbing it from the PlayerState"

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Why would it update the name in the pawn version of other clients?

brittle karma Jul 23, 2019, 3:46 PM

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@thin stratus as u said i used GetGameState and cast faild again. is it becuz GetGameState returns Game State Base and my Cpp class is just Game State?

thin stratus Jul 23, 2019, 3:46 PM

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You need to set your custom GameState class in the GameMode

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Otherwise it's not used

summer nova Jul 23, 2019, 3:47 PM

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@gleaming vector for your GC stuff, you can add those UObjects to root set

brittle karma Jul 23, 2019, 3:47 PM

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@thin stratus that did the trick, thanks

summer nova Jul 23, 2019, 3:48 PM

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and then just manage manually from the struct destructor

steady tendon Jul 23, 2019, 3:49 PM

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@thin stratus And why the multicast from server player state worked for what i want to do?

thin stratus Jul 23, 2019, 3:58 PM

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@pallid mesa Think I fixed it

steady tendon Jul 23, 2019, 4:12 PM

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@thin stratus Sorry for asking too much dude, i think i uderstood what you wanted to say. You mean that i can grab the player state variable value binding it to the widget text?

thin stratus Jul 23, 2019, 4:13 PM

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How you do it in the end doesn't matter, but Character and PlayerState aren't valid at the same time.

steady tendon Jul 23, 2019, 4:17 PM

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That was the point, so the thing is that i dont know how to call a function in the Character when the variable in the player state has been replicated

brittle karma Jul 23, 2019, 6:09 PM

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📎 1.PNG

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there are some errors that says Accessed None Trying to read property CallFunc_Create_ReturnValue. what does it mean?
everything works fine . i implemented a Count Down timer and it works fine(error happed after implementing the timer) both for server and client and everything seems to be fine when playing. so what is this error ? BP Runtime error? fyi. the fps rate goes way down after 20 seconds

brittle karma Jul 23, 2019, 6:33 PM

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i found a video that explains what this error means
https://www.youtube.com/watch?v=7uDQnQty0-4

YouTube

Ryan Laley

Unreal Engine 4 SnackSize - Solving Errors - Accessed None

In this series of videos I show you how to fix some of the more common errors found when developing games in UE4. If you have an error that you want explaine...

▶ Play video

thin stratus Jul 23, 2019, 6:37 PM

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AccessedNone is a C++ based error

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It's just not very well explained for Programming Beginners in Blueprints

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Peeps expect every variable to have some sort of value.

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You make an interger, it has a 0 as default.

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A bool is false.

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A Vector is 0,0,0 etc.

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But the "Reference" variables, which you use for Objects and Actors (and everything derived from that) are empty by default

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They are called "Pointers" in c++ and are pointing to "null" or "nothing"

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If you access them while they do that you get an accessedNone error

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You always need to get an instance of an actor that you can save into them first

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You can imagine them as a box with a label. E.g. Character.
You can save Character and all Child Classes into that.

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Ways to get these instances are: Overlaps, LineTraces, using the ReturnValue when spawning/creating something (SpawnActor/CreateWidget)

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Or static accessors, like GetGameState

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So you could make a variable of type "MyGameState"

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Which only allows MyGameState instances to be saved into

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And then do "GetGameState->CastToMyGameState" and save the result into it

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That's all I can tell you :P it's hard to explain pointers in a few sentences

brittle karma Jul 23, 2019, 6:41 PM

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📎 1.PNG

thin stratus Jul 23, 2019, 6:41 PM

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That's okay, (disregarding the performance drain of casting every frame)

brittle karma Jul 23, 2019, 6:42 PM

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@thin stratus first thanks for information, i am programmer i know those things (: i have implemented timers before for single player game

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but one thing

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when i play the game it prints "Hello"(Cast failed node) two times on screen

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so why is that happening? im wondering becuz both server and client runs the way i excpect

thin stratus Jul 23, 2019, 6:44 PM

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Who prints it, Server or Client?

brittle karma Jul 23, 2019, 6:44 PM

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client

thin stratus Jul 23, 2019, 6:45 PM

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Also :D i am programmer i know those things Right, but you asked what the error means, so that's kinda half true then.

brittle karma Jul 23, 2019, 6:45 PM

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but server should do it right?

thin stratus Jul 23, 2019, 6:45 PM

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If the Client does that then it's a simple Replication Delay.

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Multiplayer is not Instance

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Server spawns the GameState

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That takes a bit to get to the Client

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So the first few frames the GameState is invalid

brittle karma Jul 23, 2019, 6:50 PM

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alright then, but as u explained the reason for Access none is that there is a Variable with default value in blueprint . as i sent the screen shot,
there is not any variable i used Get Game State, but the error says there should be some null value. and it refers to the Player controller Bp class which adds the widget to the view port

meager spade Jul 23, 2019, 6:58 PM

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@pallid mesa you there?

pallid mesa Jul 23, 2019, 7:04 PM

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yes, I'm around, still with the issue hehe

brittle karma Jul 23, 2019, 7:20 PM

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i solved the Access none problem by changing the playercontroller like this(if anyone wonders)

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📎 1.PNG

meager spade Jul 23, 2019, 7:22 PM

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send me your isolated prohect

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@pallid mesa

high current Jul 23, 2019, 7:23 PM

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He uploaded that today

pallid mesa Jul 23, 2019, 7:24 PM

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another one hahaha

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@meager spade give me one second, I'm with zlo trying things here and there

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I'll prepare an update for you

high current Jul 23, 2019, 7:29 PM

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I took a stab at the project for a short while, then I had to do other stuff, might give it another go if its not solved by tomorrow

tawny rivet Jul 23, 2019, 7:42 PM

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is there any way other than OnRep to know what property replicated

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and when

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because i have an object that like, holds settings

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but it also has some state vars

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so i can't use PostNetReceive to test when the menu should update

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the only other option i can see is a LOT of OnRep_ events and i'd rather not do that

pallid mesa Jul 23, 2019, 8:31 PM

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@high current thank you hehe, yeah this will probably take some days, there are like 4 people paralelly looking into it

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we found some side bugs related that might clarify a bit the whole scenario

grizzled bay Jul 23, 2019, 8:36 PM

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so i have a widget calling a function in a non playable actor, i want to always run this event from the server, so do i need to set up an instance and call the player run as server event from the other actor then call the original event, or is there another way without jumping between blueprints?

thin stratus Jul 23, 2019, 8:54 PM

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If you aren't owning the Actor in question, no

grizzled bay Jul 23, 2019, 8:59 PM

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thanks, guess ill just keep hopping then 😛

pallid mesa Jul 23, 2019, 9:03 PM

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side bug https://www.youtube.com/watch?v=6VQFQFiAckI

YouTube

vorixo

Side bug 1.

▶ Play video

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the moment PC01 leaves and PC02 enters, PC01 gets dropped

tropic fjord Jul 23, 2019, 9:07 PM

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PawnPrivate is null on a PlayerState that's controlled by AI. Wut

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Why is this a thing???

winged badger Jul 23, 2019, 9:10 PM

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when @tropic fjord ?

tropic fjord Jul 23, 2019, 9:10 PM

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Always

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I don't understand why

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Maybe I need to override something in my child PlayerState

winged badger Jul 23, 2019, 9:11 PM

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it doesn't seem to be replicated

tropic fjord Jul 23, 2019, 9:12 PM

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It works fine when I use 2 Players

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When I use one that's controlled by AI, it breaks

winged badger Jul 23, 2019, 9:13 PM

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AI's don't normally have PlayerState

tropic fjord Jul 23, 2019, 9:13 PM

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I know

winged badger Jul 23, 2019, 9:13 PM

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unless you make them

tropic fjord Jul 23, 2019, 9:13 PM

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bWantsPlayerState = true;

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using that

winged badger Jul 23, 2019, 9:14 PM

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@meager spade you had a run in with that this week

tropic fjord Jul 23, 2019, 9:14 PM

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Maybe I can use the Instigator? 🤔

winged badger Jul 23, 2019, 9:14 PM

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pretty sure he had the AIController flat out ignore that boolean

tropic fjord Jul 23, 2019, 9:15 PM

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The boolean is working fine

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My functionality is getting called

meager spade Jul 23, 2019, 9:15 PM

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Yeah i did but I got it working

tropic fjord Jul 23, 2019, 9:15 PM

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You had the issue where PawnPrivate is null on a PlayerState that's controlled by AI as well? @meager spade

meager spade Jul 23, 2019, 9:15 PM

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It is null on my ai

tropic fjord Jul 23, 2019, 9:16 PM

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Right

meager spade Jul 23, 2019, 9:16 PM

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I had to set it manually

tropic fjord Jul 23, 2019, 9:16 PM

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That makes no sense :/

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I mean, I'll do it, but it makes no sense

meager spade Jul 23, 2019, 9:16 PM

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I think its cause if ai controller vs player controller

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I need to do more digging

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I spent little time on it

high current Jul 23, 2019, 9:16 PM

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@pallid mesa that only reinforces what I suspect is happening, ill check to see if i can fix it tomorrow, but it seels like you are calling events on the wrong client (or the notify has the wrong branches

winged badger Jul 23, 2019, 9:17 PM

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its not @high current

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well, i had the AIController not set itself as the Pawn's owner

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when using one of the blueprint functions, think it was SpawnAIFromClass

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there are some... mishaps in the Game Framework

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but if the AIController doesn't set the PlayerState on Pawn server side

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it just doesn't work

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if it does, replication callbacks will handle client side

tropic fjord Jul 23, 2019, 9:19 PM

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Yeah, AIController doesn't seem be able to GetPawn() either

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Odd

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I'll just make a new variable and use the Pawn I get from OnPossess, I guess

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Bit stupid, though

winged badger Jul 23, 2019, 9:22 PM

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struct FSetPlayerStatePawn
{
private:

    friend APawn;

    FSetPlayerStatePawn(APlayerState* PlayerState, APawn* Pawn)
    {
        PlayerState->PawnPrivate = Pawn;
    }
};

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this is odd to say the least

tropic fjord Jul 23, 2019, 9:22 PM

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Yeah, the entire way it's built confuses me....

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Actually, I might have a fix

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I'm actually an idiot

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Ignore all my messages

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LOL

high current Jul 23, 2019, 9:25 PM

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@winged badger that ping was weird, i expected a follow up:d

tropic fjord Jul 23, 2019, 9:25 PM

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I forgot my Super::OnPossess() call inside OnPossess in the AIController..... @winged badger @meager spade I'm dumb

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😦

winged badger Jul 23, 2019, 9:25 PM

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vor he didn't make a newb mistake, he broke the engine

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that makes it interesting

meager spade Jul 23, 2019, 9:25 PM

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Oh I never did that

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And mine still never got set

tropic fjord Jul 23, 2019, 9:26 PM

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Interesting. Mine's setting fine now

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Can call GetPawn from both AIControler and PlayerState

meager spade Jul 23, 2019, 9:26 PM

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Then again I had issue of it ignoring the bool.aseell

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Aseell

tropic fjord Jul 23, 2019, 9:26 PM

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Yeah, that's strange

high current Jul 23, 2019, 9:29 PM

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yeah, could very well be, I didnt look trough everything in the project he send, breaking the engine is always fun

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working with a broken engine, is funn-ier tho

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📎 unknown.png

indigo robin Jul 23, 2019, 9:54 PM

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It's impossible for a client to show the same state in actors as the server I'd the latency is non 0 right ?

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It always has to be behind the server by it's latency

high current Jul 23, 2019, 9:58 PM

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yes, unfortunately unreal engine cant defy the laws of physics

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YET!

indigo robin Jul 23, 2019, 9:59 PM

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This makes client lag compensated server time of limited utility

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As you want to be running behind, otherwise you would constantly be skipping the first part of animations when they happen

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The only thing you can see real-time is the autonomous proxy

high current Jul 23, 2019, 10:14 PM

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well yes, but that also gets fed replication updates which are bound to have latency

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depends on your setup ofc, but a an auth proxy for client one is sim proxy for client 2

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client 2 has delay

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server also receives updates with delay as well, so if client 1's own auth proxy fucks up, after a short while of back and forth between the server and the client, the auth proxy will be corrected

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I should be calling it auth proxy, soz

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its auto proxy

solar stirrup Jul 23, 2019, 10:23 PM

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Is it possible to pass in a pointer to a replicated component in an RPC?

indigo robin Jul 23, 2019, 10:26 PM

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@high current the auto proxy becomes simulated proxy on all the other clients so those will be delayed

high current Jul 23, 2019, 10:26 PM

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didnt i say that

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I am getting sleepy

indigo robin Jul 23, 2019, 10:27 PM

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Yes but I also said that

high current Jul 23, 2019, 10:29 PM

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alright, i apologize then

river hazel Jul 23, 2019, 11:45 PM

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@indigo robin you can do custom logic to simulate the position of the proxies forward based on latency

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this already happens for example, if you have a 30 tick server and clients are running 60fps

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they will update the positions of the proxies based on the last update from the server inbetween updates from the server

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of course the futher you simulate them forward the better chance they have of being at the wrong position, but the smoothing UE4 does can make up for that

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oh i tagged wrong person sorry :p

sour river Jul 24, 2019, 12:40 AM

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How can I call an event from a client to the gamemode?

Example: the player logs into an interface, the gamemode received an event "OnPlayerTriesToLogin(user, password)" ?

sour river Jul 24, 2019, 1:01 AM

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I've figured out something: bind an event in GM of the Player Controller. This seems to work, but are there other solutions? Also how do I call a GM event from UMG? Should I always keep a reference from the player controller?

ocean geyser Jul 24, 2019, 3:58 AM

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im stuck on making a character selector.
i have a variable in my game instance that holds the value of the selected character. i set this variable before i join or host a server. in a standalone game, if this variable is not replicated when i attempt to host a server (server travel button) it will cause my game to crash when it tries to spawn the actor in the world, if it is replicated then it works as intended.
(when replicated) i select a character (lets say the default mannequin), click server travel and it spawns me in with the correct character. then on another client i select the character on the right, click client travel, and join the server as the mannequin. it spawns the client in with the same character as the server. im assuming because its replicated eventhough its not suppose to replicate?

anyways, heres some code of the gamemode and a screenshot

void ATheHouseGameMode::HandleStartingNewPlayer_Implementation(APlayerController* NewPlayer)
{
    Super::HandleStartingNewPlayer_Implementation(NewPlayer);
    UE_LOG(LogTemp, Warning, TEXT("Handle Starting New Player"));
    if (UGameInstance * GI = NewPlayer->GetGameInstance())
    {
        if (UTheHouseGameInstance * GameInstance = Cast<UTheHouseGameInstance>(GI))
        {
            UE_LOG(LogTemp, Warning, TEXT("Got Game Instance"));
            if (ACharacterBase * Character = GameInstance->GetSelectedCharacter())
            {
                FVector Location = FVector(-400.0f, 50.0f, 190.0f);
                if (ACharacterBase* SpawnedCharacter = GetWorld()->SpawnActor<ACharacterBase>(Character->GetClass(), Location, FRotator::ZeroRotator))//CRASHES HERE IF SELECTEDCHARACTER IS NOT REPLCIATED IN THE GAME INSTANCE
                {
                    UE_LOG(LogTemp, Warning, TEXT("Spawned Character"));
                    NewPlayer->Possess(SpawnedCharacter);
                }
            }
        }
    }
}

📎 unknown.png

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the testing was done on a standalone game outside of the editor, and each character is a different class that is derived from ACharacterBase

ocean geyser Jul 24, 2019, 4:34 AM

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after thinking, the crash im assuming is coming from an invalid pointer in the game instance. the game instance SelectedCharacter was pointing at a ACharacter, but due to the transition it was no longer doing so, instead i need to get a pointer to the class of that character? if so, how can i get a pointer to a class

vapid mortar Jul 24, 2019, 7:54 AM

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hello guys. i'm using AWS Gamelift to create multi-session. Player connect to the host will go to the lobby. When the host press start button which i'm using ServerTravel to the game map, the session get destroyed. What can i do to make the session stay active after server travel?

final thicket Jul 24, 2019, 8:14 AM

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https://docs.unrealengine.com/en-US/Gameplay/Networking/Travelling/index.html

Travelling in Multiplayer

An overview of how travelling works in multiplayer.

chrome bay Jul 24, 2019, 8:26 AM

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If the session is being killed it's because the game is doing it somewhere

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Travelling doesn't inherently destroy the session

covert gorge Jul 24, 2019, 11:52 AM

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does anyone know if it is possible to enable CharacterMovementComponent replication while the character is attached?

chrome bay Jul 24, 2019, 12:00 PM

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It doesn't do anything when the actor is attached to something

high current Jul 24, 2019, 12:00 PM

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Attaching a character isnt replicated by itself

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Your issues might come from there

chrome bay Jul 24, 2019, 12:07 PM

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It is

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via AttachmentReplication - but naturally you should attach server-side only to achieve that

steady tendon Jul 24, 2019, 12:09 PM

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How is the NetCullDistance supposed to work in the OnRep functions of the PlayerState class?

high current Jul 24, 2019, 12:12 PM

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Well then I am lost, as just yesterday we established that attaching to component isnt replicated

chrome bay Jul 24, 2019, 12:12 PM

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Player States aren't culled by default

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@high current If you attach an actor to another actor and it replicates movement, the attachment will replicate

steady tendon Jul 24, 2019, 12:13 PM

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@chrome bay So if i have variables like PlayerName, GuildName and so on they should be placed in the Pawn?

high current Jul 24, 2019, 12:13 PM

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Ah, yes that is true, but the client wont consider the two bodies attached

chrome bay Jul 24, 2019, 12:13 PM

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Unlikely, since that data is for the player not the pawn

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@high current it does, it attaches the root component to whatever 'attach component' is, including socket etc.

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See FRepAttachment and OnRep_AttachmentReplication()

steady tendon Jul 24, 2019, 12:14 PM

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The problem is that the widget that displays that info is in the Pawn, and i dont know how to pass the replicated value in the OnRep events in the player state

chrome bay Jul 24, 2019, 12:15 PM

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Just get the info from the pawns player state

steady tendon Jul 24, 2019, 12:15 PM

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Using a bind in the widgets with a reference to the pawn?

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Can it be done with an event?

chrome bay Jul 24, 2019, 12:15 PM

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IMO it's better design to have the UI query the game for info instead of the game telling the UI about info

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Just use the widget tick event to update the text

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Widgets all already tick anyway, and ticking is far cheaper than evil bindings

steady tendon Jul 24, 2019, 12:16 PM

#

Binding would be a query technique?

high current Jul 24, 2019, 12:17 PM

#

Try to stay away from widget binds

#

Are you using the hud class

steady tendon Jul 24, 2019, 12:17 PM

#

No, just widget component in the pawn

#

Why binding is worse than ticking if they both execute each frame?

chrome bay Jul 24, 2019, 12:19 PM

#

Because bindings are executed even when the widget isn't visible

#

Ticks are not

steady tendon Jul 24, 2019, 12:19 PM

#

Oh alright

high current Jul 24, 2019, 12:20 PM

#

@chrome bay its wierd as yesterday we were debugging an attachment case with exi and vor, and the conclusion was to attach on rep for all clients, anyway.... Sorry for that then

steady tendon Jul 24, 2019, 12:20 PM

#

I will do it like that, but i still would like to clarify some aspects of the PlayerState class

chrome bay Jul 24, 2019, 12:20 PM

#

They're handy, but don't use them too often as they will ultimately drag performance down once your UI reaches a certain size

steady tendon Jul 24, 2019, 12:20 PM

#

Alright

#

If i have a GuildName replicated variable in the PlayerState, every client will get that change even if they are too far?

#

As you said the PlayerState doesnt have cull distance by default

chrome bay Jul 24, 2019, 12:22 PM

#

Player States are always relevant yeah, so they don't cull

#

But they are there for persistent player info

#

Say you add a scoreboard later, you want to get the players name no doubt

steady tendon Jul 24, 2019, 12:23 PM

#

Nice

#

And just a last thing dude

#

If i am in a OnRep event in the PlayerState, and i put a SwitchHasAutority to then execute GetPlayerCharacter in the Remote, what player character am i getting there?

#

Its confusing

#

As OnRep is executed in every client

high current Jul 24, 2019, 12:26 PM

#

Every local character

#

If you run it trough the owner

#

Then you will only get a valid object for the owner of the player state

steady tendon Jul 24, 2019, 12:29 PM

#

So i cant use that reference to update the widget i mentioned before, as other clients wouldnt see the change of the player state owner right?

high current Jul 24, 2019, 12:30 PM

#

You can

#

If you use 'get player pawn' {0}

#

That is rhe pawn of the recieving player locally

#

Which owns the hud

#

Not on pc atm but that should be the way to go

steady tendon Jul 24, 2019, 12:32 PM

#

Let me test and i will tell you the results

#

I have the pc here

#

So i wouldnt need to use the tick event as Jamsh suggested?

#

@high current I have just noticed there is a PawnPrivate variable in the player state

high current Jul 24, 2019, 12:35 PM

#

The tick event approach is a more generalized way to structure UI

#

Never used that one

#

That is prpbably only valid for the owner though, so not what you want

#

Worth a try to

steady tendon Jul 24, 2019, 12:41 PM

#

I have tried the GetPlayerPawn and it doesnt work

#

With the tick event it works perfectly

#

But i havent understood why using the GetPlayerPawn doesnt work...

#

Im going to send some pics to try whats the result and what should be

#

The result i get using the OnRep in the player state

#

At the top left you can see the corrent player name that should be shown above the player head, it is set with a RPC from player state server to owning client so it works perfectly

📎 NoFuncionando.PNG

#

Now the result setting a reference to the pawn in the widget and extracting the info of the player state from that pawn ref in the widget tick event as @chrome bay suggested

#

📎 OK.PNG

thin stratus Jul 24, 2019, 1:03 PM

#

Well you are just running into a timing issue

#

Usually the PlayerState exists long before the Character does.

#

And depending on latency and stuff, your OnRep in the PlayerState might call before your Character is spawned and possessed.

steady tendon Jul 24, 2019, 1:04 PM

#

Let me try using a delay node

thin stratus Jul 24, 2019, 1:04 PM

#

The tick solution works cause it's basically polling the whole time until everything is valid.

#

No, delay nodes are not the solution

steady tendon Jul 24, 2019, 1:04 PM

#

Just for curiosity

thin stratus Jul 24, 2019, 1:04 PM

#

You could get away with just binding it and polling it + null guarding (isValid) for now.

#

And fix it if it ever gets a problem performance wise

steady tendon Jul 24, 2019, 1:05 PM

#

Perfect!

thin stratus Jul 24, 2019, 1:05 PM

#

This is a 3D widget or?

#

Or rather a WidgetComponent

steady tendon Jul 24, 2019, 1:05 PM

#

Yes

#

Widget component

#

Screen space

thin stratus Jul 24, 2019, 1:05 PM

#

Yeah you run into another issue, which is that the Widget in that has no proper owner

#

Usually when you create a widget by hand, you pass the owner

#

A Pawn spawns and creates the Widget long before the Pawn is possessed

steady tendon Jul 24, 2019, 1:06 PM

#

That could ask everything....

thin stratus Jul 24, 2019, 1:06 PM

#

So it has no valid owner

#

So you can not use GetOwningPlayer and such

#

You could set the owner afterwards, but you'll quickly find out that nested widgets don't update, so you'd need to build your own recursive call for that

steady tendon Jul 24, 2019, 1:06 PM

#

But it should work using the GetPlayerPawn in the OnRep event of the PlayerState?

thin stratus Jul 24, 2019, 1:06 PM

#

The other idea, if you want it event based, is to make sure you cover all cases

#

You can't be sure the Pawn is valid when the OnRep calls, can you ;)

river hazel Jul 24, 2019, 1:07 PM

#

trigger the initial update in onpossess and let updates after that work through the onrep?

thin stratus Jul 24, 2019, 1:07 PM

#

You have two points in which you can react to this

#

The Pawn has an OnRep_PlayerState in C++

#

And the PlayerState should have a Pawn variable by now iirc

#

Doesn't have an OnRep though

river hazel Jul 24, 2019, 1:08 PM

#

half of UE multiplayer stuff is finding out when everything is setup, you also hve to check for what happens when actors leave/enter relevancy too

thin stratus Jul 24, 2019, 1:08 PM

#

So the PlayerState has an OnRep_PlayerName

#

What i would do is this:

high current Jul 24, 2019, 1:08 PM

#

Playerstates are always relevant, so at least he doesnt need to worry bout that

steady tendon Jul 24, 2019, 1:09 PM

#

@river hazel That why i asked before about the player state cull distance

thin stratus Jul 24, 2019, 1:09 PM

#

I would use OnRep_PlayerState in the Pawn to grab the PlayerName and set the value in the Widget.

#

Now that covers one way. It could be that the PlayerName is not yet replicated.

#

So you have to catch the other direction too.
OnRep_PlayerName won't work I think, cause you have no access to the Pawn it belongs to.
A variable exists but isn't replicated.

#

So you could make your own Pawn variable in the PlayerState and OnRep that.

#

Letting the Server set the variable OnPossess

high current Jul 24, 2019, 1:10 PM

#

I usually prefer dealing trough the PC with this stuff

thin stratus Jul 24, 2019, 1:11 PM

#

Not possible as simulated clients don't have access to that

high current Jul 24, 2019, 1:11 PM

#

For the initialization part

#

I mean

steady tendon Jul 24, 2019, 1:11 PM

#

Lol it was more complicated than i thought

thin stratus Jul 24, 2019, 1:11 PM

#

Yeah it's annoying to get the name into the Widget

#

I would still suggest just binding it

#

Use OnRep_PlayerState to pass the PlayerState to the Widget.

#

and the just bind to GetPlayerName

#

Yolo

high current Jul 24, 2019, 1:12 PM

#

:d

steady tendon Jul 24, 2019, 1:12 PM

#

I looked for the typical Health scenario, and you had one example in your compendium, but that variable was in the pawn so the case is different

thin stratus Jul 24, 2019, 1:12 PM

#

Yus

steady tendon Jul 24, 2019, 1:12 PM

#

(Amazing compendium by the way dude)

high current Jul 24, 2019, 1:13 PM

#

^

thin stratus Jul 24, 2019, 1:13 PM

#

Cheers

steady tendon Jul 24, 2019, 1:13 PM

#

So tick event is going to do the trick

#

And fuck everything

#

Event based seems very complciated to do

high current Jul 24, 2019, 1:13 PM

#

depwnds on the stuff you layer on afterwards

thin stratus Jul 24, 2019, 1:14 PM

#

Not Tick directly

#

Just bind to the Text of the Widget

#

It's ticking too though

#

But well

#

Cleaner :P

steady tendon Jul 24, 2019, 1:14 PM

#

Jamsh said that tick is better than binding because binding is called even if the widget is not visible

high current Jul 24, 2019, 1:14 PM

#

And as me and jamsh said, bind is worse than tick

#

But the thing is

steady tendon Jul 24, 2019, 1:15 PM

#

But in this case the widget will be always visible while the players are visible

thin stratus Jul 24, 2019, 1:15 PM

#

Fair enough. My stuff all binds. Not having problems yet. ¯_(ツ)_/¯

steady tendon Jul 24, 2019, 1:15 PM

#

So i think binding would be the same

high current Jul 24, 2019, 1:15 PM

#

As long as you know that this can be an issue

#

Its fine

thin stratus Jul 24, 2019, 1:15 PM

#

I know that Tick is an issue in general

high current Jul 24, 2019, 1:15 PM

#

Because as soon as it is

thin stratus Jul 24, 2019, 1:15 PM

#

If it's an issue when it's invisible

#

Then it's an issue if it's visible

high current Jul 24, 2019, 1:15 PM

#

You can go back and fiddle with it

thin stratus Jul 24, 2019, 1:16 PM

#

Yeah but if you have performance issues cause it ticks when it's not visible, you most likely have the same problem when it ticks being visible

steady tendon Jul 24, 2019, 1:16 PM

#

Everything was solved, thank you so much guys, you are amazing

thin stratus Jul 24, 2019, 1:16 PM

#

Yus

steady tendon Jul 24, 2019, 1:16 PM

#

But seems to be the only clean solution, the tick event

high current Jul 24, 2019, 1:16 PM

#

When i finally play hoverloop, if i have fps problems, ik what to blame now :)

thin stratus Jul 24, 2019, 1:16 PM

#

I can tell you what to blame

#

And it's not the GameThread that has 7ms on full load

steady tendon Jul 24, 2019, 1:17 PM

#

Oh i almost forgot, just one curiosity about the compendium eXi

thin stratus Jul 24, 2019, 1:17 PM

#

Compared to the awesome RT that has 25+

#

.>

steady tendon Jul 24, 2019, 1:17 PM

#

You say that Pawns are MOSTLY replicated

#

What do you mean by mostly?

high current Jul 24, 2019, 1:17 PM

#

/shrug

thin stratus Jul 24, 2019, 1:17 PM

#

What was the context for that mostly

high current Jul 24, 2019, 1:17 PM

#

Cull distance

#

Maybe

steady tendon Jul 24, 2019, 1:18 PM

#

Its in the Pawn page

#

Let me make a screenshot

thin stratus Jul 24, 2019, 1:18 PM

#

Ah

#

Found it

steady tendon Jul 24, 2019, 1:18 PM

#

I think its the cull distance and so on

thin stratus Jul 24, 2019, 1:18 PM

#

Might be me just wording things shitty

steady tendon Jul 24, 2019, 1:18 PM

#

But jsut to make sure

thin stratus Jul 24, 2019, 1:18 PM

#

It's not my first language after all

high current Jul 24, 2019, 1:18 PM

#

Excuses...

steady tendon Jul 24, 2019, 1:19 PM

#

Well it is not bad written at all as player state is always relevant but pawns not

high current Jul 24, 2019, 1:19 PM

#

Anyway, Anje did you put an is valid on the tick?

steady tendon Jul 24, 2019, 1:19 PM

#

Yes

thin stratus Jul 24, 2019, 1:19 PM

#

I'll keep in mind to remove that mostly

high current Jul 24, 2019, 1:19 PM

#

Then ur good to go

steady tendon Jul 24, 2019, 1:19 PM

#

Im a lover of IsValid node

thin stratus Jul 24, 2019, 1:19 PM

#

no idea what I wanted with that

steady tendon Jul 24, 2019, 1:20 PM

#

Has anything changed since the 4.17 version?

#

I mean the multiplayer stuff

high current Jul 24, 2019, 1:20 PM

#

Not that i can think of, mostly fixes

#

Right?

#

The replication graph is a thing

steady tendon Jul 24, 2019, 1:21 PM

#

What is that?

thin stratus Jul 24, 2019, 1:21 PM

#

Maybe the mostly means that there are parts in it that are owner only haha.
I have to fix that

high current Jul 24, 2019, 1:21 PM

#

Losts of optimizations for big player counts

thin stratus Jul 24, 2019, 1:21 PM

#

It's a system that allows Fortnite to exist

high current Jul 24, 2019, 1:21 PM

#

Rep graph is for that

thin stratus Jul 24, 2019, 1:22 PM

#

By putting Actors into Buckets of how important they are for a player

#

And based on that they replicated more often or not at all etc.

#

I think on PC, only the 3 closest enemies are in the top priority bucket

#

On mobile only 1

high current Jul 24, 2019, 1:23 PM

#

I am curios how the rep graph adjusts if you use a scoped weapon

thin stratus Jul 24, 2019, 1:25 PM

#

@chrome bay loves talking about this wonderful, bugfree system

#

Can probably tell you something about it

#

If the poor guy has time

high current Jul 24, 2019, 1:25 PM

#

Anyway, props for the underwater hoverloop lvl, i know its not your department but them caustics are nice

steady tendon Jul 24, 2019, 1:25 PM

#

This Fortnite...

thin stratus Jul 24, 2019, 1:25 PM

#

Thanks, I will forward it!

high current Jul 24, 2019, 1:26 PM

#

Speaking of it tho, been meaning to ask, how many line traces are you using for the hover rafts?

#

Tf.... Autocorrect

thin stratus Jul 24, 2019, 1:27 PM

#

To get some smooth hovering, it's I think 8 atm

#

Could show you, but the PlayFab Plugin isn't compiling xD Can't start the project

high current Jul 24, 2019, 1:27 PM

#

I am doing 4 for mine

#

Well 5

#

But the 5th is doing dot product stuff

thin stratus Jul 24, 2019, 1:28 PM

#

We have a few additional ones, like 2 or so for other things, like ground contact or finding a surface that counts as "Gravity"

high current Jul 24, 2019, 1:28 PM

#

Recently realised my hover movement can easily turn into spiderman movement...

thin stratus Jul 24, 2019, 1:29 PM

#

Technically yes, if you keep the Gravity direction optional, then you can easily adjust it to do that

#

Which is what we do. The HoverComponent takes any Gravity Direction and just works from there on

high current Jul 24, 2019, 1:29 PM

#

I am keeping default phys gravity tho

#

Can turn it off, but worked better with it

thin stratus Jul 24, 2019, 1:29 PM

#

Ah, you're working with Force?

high current Jul 24, 2019, 1:30 PM

#

Iirc

#

Phys thrusters

#

So yes

thin stratus Jul 24, 2019, 1:30 PM

#

We have Physics/PhysicX disabled

high current Jul 24, 2019, 1:30 PM

#

Its an old ish project

thin stratus Jul 24, 2019, 1:30 PM

#

It's all Vector Math

#

And then adjusting Velocity based on that

#

Can't network physics stuff otherwise

high current Jul 24, 2019, 1:31 PM

#

Ikr

steady tendon Jul 24, 2019, 1:31 PM

#

Is there some documentation about good practices on multiplayer stuff?

chrome bay Jul 24, 2019, 1:32 PM

#

Don't use rep graph unless you're comfortable poking around engine internals

#

it's buggy as hell atm

high current Jul 24, 2019, 1:32 PM

#

Had a run in with that wen doing tribes ish custom cmc movement

steady tendon Jul 24, 2019, 1:32 PM

#

Or just getting frustrated when things dont work?

thin stratus Jul 24, 2019, 1:32 PM

#

Don't think so. It's mainly about knowing what Classes to use for what.

#

If you know the basics about Replication and Ownership, as well as RPC vs RepNotify

#

Then the only thing left is where to place what

#

GameMode,GameState,PlayerState,PC,Character, etc.

steady tendon Jul 24, 2019, 1:33 PM

#

I know what your compendium explains

thin stratus Jul 24, 2019, 1:33 PM

#

And then maaaaybe some stuff about prediction on client side

steady tendon Jul 24, 2019, 1:33 PM

#

I think i place things correcly, but you know, im never 100% sure

thin stratus Jul 24, 2019, 1:33 PM

#

So doing gameplay effects on the executing client directly

high current Jul 24, 2019, 1:33 PM

#

@chrome bay no yeah, i am hoping i dont have to use that, next univrrsity year is 1y long project, but the BR wave is over so I will try to steer away from doing anything above 12 players

steady tendon Jul 24, 2019, 1:34 PM

#

Mostly i would like to know how to control asyncronus execution in the engine

#

I mean, the beginplay of this class can go faster than this one

#

So maybe this reference is not valid at this moment

#

Just techniques or tips to control this type of events better

high current Jul 24, 2019, 1:35 PM

#

Anje was just asking and i got curious about how rep graph handles weapon scoping in(in regards to player relevancy for replication

indigo robin Jul 24, 2019, 1:35 PM

#

rep graph is something you write

#

for your game specifically

#

the default just uses the exising virtual methods on actors/objects

high current Jul 24, 2019, 1:36 PM

#

Aight

#

@steady tendon another thing is knowing when to use async event execution and when not to

#

Not directly a MP matter

#

But running events asynchronously can help avoid some bugs in MP

#

But running events asynchronously can help avoid some bugs in MP

steady tendon Jul 24, 2019, 1:40 PM

#

Alright, anyway im getting better and better with the practice

#

Its like i dont want to see more Delay nodes with 0.1 seconds to wait till something is valid, i feel my code is ugly with that

high current Jul 24, 2019, 1:42 PM

#

Oh if i was on my pc i could post some memes from my networking code

#

:(

steady tendon Jul 24, 2019, 1:42 PM

#

Hahaha

high current Jul 24, 2019, 1:43 PM

#

Like a pawn waiting for its PS to be valid via a delay node which runs from cast failed right back into the cast

chrome bay Jul 24, 2019, 1:46 PM

#

yeah don't do that

#

😄

high current Jul 24, 2019, 1:47 PM

#

:d

pallid mesa Jul 24, 2019, 1:47 PM

#

on bp's you sometimes have to do that

#

lmao

high current Jul 24, 2019, 1:48 PM

#

Yeah, obviously... But you know what they say, if it works it works

chrome bay Jul 24, 2019, 1:48 PM

#

you're all fired

pallid mesa Jul 24, 2019, 1:48 PM

#

well, the famous bug I've shown is not BP exclusive

#

James plx I have a family to feed

high current Jul 24, 2019, 1:49 PM

#

Im an intern

#

You dont pay me anyway...

#

Lol

pallid mesa Jul 24, 2019, 1:49 PM

#

About the issue, we are trying to find an ABC work around

#

and probably report it to UDN later this week

#

we are maybe facing to a dangling PS and 2 PC's possessing the same pawn

#

all because of a late payload on netcull

#

tldr: https://www.youtube.com/watch?v=oMB-mp8yj2w

rose egret Jul 24, 2019, 1:54 PM

#

how static array is replicated? as a whole just like TArray?
I have such a property for my inventory.
FHeroBackpackSlot BackpackSlots[32];
I don't want it to be replicated completely every time an element gets changed.

thin stratus Jul 24, 2019, 1:54 PM

#

The only allowed usage of a DelayNode is with a 0 in it.

#

And that's not a joke of sorts.

bitter oriole Jul 24, 2019, 1:55 PM

#

^

pallid mesa Jul 24, 2019, 1:55 PM

#

does it compute differently with 0 as the input? (I know for a fact is a frame skip)

high current Jul 24, 2019, 1:58 PM

#

Say that you have a ability cooldown in an MP game, how would you guys handle that, considering you also have to do UI for it

pallid mesa Jul 24, 2019, 1:58 PM

#

timer

high current Jul 24, 2019, 1:58 PM

#

Say the UI is a progress bar

brittle karma Jul 24, 2019, 1:59 PM

#

hey guys. if i want to implement the health system for players, should i use RPCs? or Replicated Variables are doing the job?

high current Jul 24, 2019, 1:59 PM

#

Would you run a timer on server and do something like a timeline or animation locally?

pallid mesa Jul 24, 2019, 2:00 PM

#

@brittle karma a replicated variable being altered on the server is enough. I recommend you doing it onrep so you can call the "death" function when Health <= 0

high current Jul 24, 2019, 2:00 PM

#

@brittle karma unreal already has a damage system which serves as your RPCs

#

So the rest is variable work

pallid mesa Jul 24, 2019, 2:01 PM

#

@high current almost everytime you create a timer you need a timerhandle to cancel it or invalidate it just in case

brittle karma Jul 24, 2019, 2:01 PM

#

@pallid mesa thanks, where is the proper place to implement this? Player controller, Game State or Pawn itseld?

pallid mesa Jul 24, 2019, 2:02 PM

#

the health belongs to the pawn

brittle karma Jul 24, 2019, 2:02 PM

#

@high current is it already on c++ too?

pallid mesa Jul 24, 2019, 2:02 PM

#

@high current the timer handle provides the time elapsed

#

however what we do is letting the owning client know they need to start an animation with a clientrpc if that timer is critical and needs to be called from the server

#

you can then compensate with the player latency in case you need accurate animations

high current Jul 24, 2019, 2:03 PM

#

If yoy need the the rest of the players to know your HP, consider making the player state aware of the pawns health

pallid mesa Jul 24, 2019, 2:05 PM

#

well health doesn't belong to the PS, but if you want to treat it as some sort of score

#

I guess you could

high current Jul 24, 2019, 2:05 PM

#

So if its a ui progress bar you read the timer handle on tick? :d

pallid mesa Jul 24, 2019, 2:06 PM

#

you could do that or just trigger an animation with a variable in which you calculate the play factor of the anim

high current Jul 24, 2019, 2:06 PM

#

^yeah

pallid mesa Jul 24, 2019, 2:06 PM

#

test and see which one is more convenient for you, I would go for the anim route

high current Jul 24, 2019, 2:06 PM

#

Anim sync is much better

pallid mesa Jul 24, 2019, 2:06 PM

#

but you know you have the timer handle for whatever you need

#

one little trick, make the animations a bit longer than the actual effector

#

not too much longer, just a tiny bit

high current Jul 24, 2019, 2:08 PM

#

I have done a system with server game time syncs and events for begin and end, but i was ticking anyway so thats why

#

And used ui anims

#

Another time I had to rush a prototype and did server replicated timelines

#

There i had dynamic cooldowns and needed to modify stuff mid cooldown

#

But if i have more time ill probably do timers

steady tendon Jul 24, 2019, 2:34 PM

#

I did something similar with typical buff system using just 1 timer for any amount of buffs. Lets say i have Buff A with 5 seconds left and I want to apply a new Buff B (with 10 seconds time duration). In that moment i substract the timer elapsed time to the remaining duration of Buff A, then i add Buff B to the array and the last step is to reset the timer with the shortest remaining time of all buffs, in this case will be Buff A

#

Then the server sends RPC to the client with the new Buff B and the duration it has, enough to handle everything in the widgets to show a countdown or something like that

#

When the server timer finishes, it removes the buff that had the shortest buff time and resets the new time with the shortest buff time of the rest in the array, then notifies client with RPC with the removed buff

#

@high current I dont know if it is related to your question 😂😂😂

high current Jul 24, 2019, 2:48 PM

#

Everything is, we are just discussing here :)

brittle karma Jul 24, 2019, 3:21 PM

#

im logically stuck, players overlap items and pick them up. the pickup item class calls a function for the instegator pawn and updates its inventory by increasing the variable number of that item. now i want to show that number on screen.
so i implemented a function inside Player Controller like this.

int ARollerPlayerController::LaserLeft()
{
for (FConstPawnIterator it = GetWorld()->GetPawnIterator(); it; it++)
{
AMultiplayerBallsBall* LaserOwnerPawn = Cast<AMultiplayerBallsBall>(it->Get());

    if (LaserOwnerPawn)
    {
        UE_LOG(LogTemp, Warning, TEXT("Laser Owner pawn is :: %s"), *LaserOwnerPawn->GetName())

        // get laser amount for the playing pawn
        return LaserOwnerPawn->GetLaserAmount();
    }
}
return 0;

}

but it always return 0 for client side

#

and that UE log always returns this :: Laser Owner pawn is :: BP_MultiplayerBallsBall_C_0 which is server pawn's name

#

logically by a for loop i am getting all pawns in my game, so it should call the LaserOwnerPawn function for client too

#

shit, i guess i messed up when i used return in for /:😑

twin juniper Jul 24, 2019, 4:27 PM

#

@HACK: Workaround until https://forums.unrealengine.com/unreal-engine/feedback-for-epic/1369596-allow-blueprints-to-call-serverrestartplayer is resolved.

Was this ever resolved in UE4 builds?

Unreal Engine Forums

Currently, there is no mechanism for calling ServerRestartPlayer in Blueprint.

There is also no mechanism for calling RestartPlayer in Blueprint that respects

high current Jul 24, 2019, 4:35 PM

#

📎 unknown.png

#

(:

gleaming vector Jul 24, 2019, 5:39 PM

#

Has anyone ever taken an already existing UObject, renamed it to a new outer, and tried to Replicate it under that new outer's ReplicateSubobjects function?

#

I'm getting an issue where when that UObject is received on the client, it still has it's old outer

brittle karma Jul 24, 2019, 6:02 PM

#

how can i get player controller inside other class? fyi. i want to get the player controller of the pawn who overlapped some items.
void AMultiplayerBallsBall::Server_UpdateLaserAmo_Implementation(int Val)
{
CurrenetLaserAmo += Val;

//send updated data to the screen. how?

}

#

is it even possible to access to client PC from Server Function?

high current Jul 24, 2019, 6:09 PM

#

the compendium has a nice page about that

brittle karma Jul 24, 2019, 6:15 PM

#

i just found that. i should read it. thanks

high current Jul 24, 2019, 6:17 PM

#

dont thank me

#

thank exi

brittle karma Jul 24, 2019, 6:29 PM

#

of course. when i first saw the writer's name, i just said hell this is the guy on discord. thanks for the effort exi.

thin stratus Jul 24, 2019, 6:36 PM

#

offtopic The moment you see WoW Server dying from 80 players fighting PvP on the World map.
Damn that War Mode is well implemented :D

#

And the Server literally died

#

Server got rolled back from that. Hey if you (random UE4 dev) feel bad about your UE4 multiplayer lag, remember, Blizz can't do it either.

high current Jul 24, 2019, 6:45 PM

#

eh, as long as we use floating points, no one can do it perfectly

#

📎 posits-vs-ieee754.png

#

That being said, the only games which impressed me in regards to networking, are the battlefield series, titanfall

#

and lawbreakers

#

battlefield has rly clever lag compensation

#

titanfall manages to run uber smoothly with an insanely low tickrate, and lawbreakers hit insanely high response times

#

link to the article

#

https://www.nextplatform.com/2019/07/08/new-approach-could-sink-floating-point-computation/

New Approach Could Sink Floating Point Computation

In 1985, the Institute of Electrical and Electronics Engineers (IEEE) established IEEE 754, a standard for floating point formats and arithmetic that

#

someone shared it on twitter last month

pallid mesa Jul 24, 2019, 8:52 PM

#

very well said, I'm still impressed how back in day world of warcraft could handle whatever you threw at it, and how now there are certain issues in the core netcode.

#

And don't get me wrong, they have some of the smartest network optimizations in place

#

but again, containing all the players in a single point while all of them are relevant for each other is, and will be one of the hardest challengers a developer would have to handle

thin stratus Jul 24, 2019, 9:10 PM

#

Actually in Vanilla/Classic, it would've worked.

#

We had 40 vs 40 Battlegrounds working just fine.
We had 40 vs Main Town Raids working.

#

The current Retail version just has so much going on, with hundreds of variables that are new and have to be replicated etc., that it's not doing it anymore.

#

I feel they moved back on server strength

cerulean escarp Jul 25, 2019, 12:49 AM

#

so I created a simple shop widget that my player can open and click a button to spawn a vehicle but when I click the button the vehicle is spawned only on the client, not the server, which means the player can't interact with it at all. any ideas how I could fix this?
here's my script for it:
https://i.imgur.com/hk6ZhP0.png

Imgur

granite peak Jul 25, 2019, 2:43 AM

#

I have seamless travel, however in my GameMode I have a PostLogin event that assigns players their teams, and the event was intended to fire when the map is loaded in.

Is there an equivalent to PostLogin that fires right after seamless travel?

#

the problem is that postLogin already fires when players join the lobby, so it won't fire during seamless travel

lost inlet Jul 25, 2019, 2:44 AM

#

really don't like BP for multiplayer stuff, but in the above example that will only run on the server, never the client. also using the Get Player Character node with a fixed index is not how you would make something compatible with multiplayer

#

the only situation is that you're PIEing in non-dedicated, and you're interacting with whatever this is as the first player which is essentially the listen server host

#

also when it comes to server RPCs, the client calling the function must be the owner of that actor

gleaming niche Jul 25, 2019, 5:45 AM

#

use "GenericPlayerInitialization"

#

instead of PostLogin

#

it gets called both at the same as postlogin, AND after seamless travel

#

     * Handles all player initialization that is shared between the travel methods
     * (i.e. called from both PostLogin() and HandleSeamlessTravelPlayer())
     */
    virtual void GenericPlayerInitialization(AController* C);```

#

@granite peak

thin stratus Jul 25, 2019, 7:34 AM

#

Did anyone use the GameInstance or LocalPlayer Subsystem since it became available?
I have a plugin with functions to login/access our backend and I usually placed this into the GameInstance, cause of Lifetime and such.
However I wonder if placing it into a GameInstanceSubsystem makes sense or if that is the wrong usage of that Subsystem class.

fossil spoke Jul 25, 2019, 7:42 AM

#

Yeah totally do it. The subsystems are just a convenient "extension" with a managed lifetime.

#

Saves you time having to setup a manager and maintaining its existence, initing it etc etc

#

I moved our GameLift manager over to a GameInstance subsystem, really wasnt much hassle and essentially operated identically as what i was doing before was creating a UObject during Init() anyway.

#

Plus you get those nice auto generated Blueprint nodes to grab it as well.

pastel totem Jul 25, 2019, 7:45 AM

#

Yeah subsystems are awesome!

thin stratus Jul 25, 2019, 7:48 AM

#

Coolio.

#

@fossil spoke Funfact, GameLift or GameSparks (can't recall) had a USceneComponent instead of a UObject for their stuff before.

#

However that was a little bit too much for me to watch so I told them they really don't wanna do that :D

#

@pastel totem @fossil spoke One quick question: Is that ONE Subsystem per Class (LocalPlayer, GameInstance) or does it allow multiple?

pastel totem Jul 25, 2019, 7:59 AM

#

Yeah you can do multiple

thin stratus Jul 25, 2019, 7:59 AM

#

Awesome, thanks!

#

I wonder though if I would keep things like the login state in the GI or LocalPlayer

#

A LocalPlayer does not survive map changes, right? I wonder why Epic puts the login stuff into that in UT.

#

you would have one LocalPlayer per Splitscreen user, which shouldn't even login.
I will use the GI I guess

pastel totem Jul 25, 2019, 8:22 AM

#

No I don't think it survives map changes.
GI is the better option imo

pastel totem Jul 25, 2019, 8:45 AM

#

I have a skeletal mesh actor which is simulating physics on the server and replicates movement.
The replication works fine, even when attaching it to something. But when I detach it again, the transform doesn't replicate anymore...
I never had this issue, am I missing something?

Attach and Detach is done on the server, as well as physics replication

twin juniper Jul 25, 2019, 10:02 AM

#

Integrated Steam into the game, but the trouble is that you cannot test the dedicated server and the client at the same time, if you start the server, it takes the account from the Steam and the client cannot get the Steam account, you can do something so that you can test everything on one account ?

bitter oriole Jul 25, 2019, 10:05 AM

#

Nope

#

You need two machines and two Steam accounts

twin juniper Jul 25, 2019, 10:08 AM

#

Strange, other games like rust, garry's mod, cs games, allows using one machine and one steam account

bitter oriole Jul 25, 2019, 10:54 AM

#

@twin juniper It's more subtle than that

#

You can't log in to two Steam accounts, and you need two accounts for matchmaking / joining sessions

#

If you disable the Steam subsystem, you'll be able to join the game

#

Multiplayer code - having two games talk to each other - doesn't use Steam in any way

#

So these games do exactly that, to ; they just let you connect to the local server on the PC without matchmaking

#

In UE4, this is done by using the null OSS

#

Of course, the drawback to this is that in UE4, using Steam is an all-or-nothing matter

thin stratus Jul 25, 2019, 11:13 AM

#

The Steam Server needs no Account

#

It needs the Steam DLLs.

#

It should also be very much possible to host a DedicatedServer on your PC and join it with the same PC.

#

Did that plenty of times with other Steam titles.

#

Just that UE4 is shitty with Steam for whatever reason.

#

@bitter oriole @twin juniper

#

And these Games can't use NULL OSS, cause they show up in the Steam Server Browers for others.

#

best example would be Counter Strike

bitter oriole Jul 25, 2019, 11:15 AM

#

Okay, well, I don't use dedi so I really don't know, thought it'd work like for regular clients.

#

Sorry for the bad information

thin stratus Jul 25, 2019, 11:18 AM

#

All good, no one has good information on steam DedicatedServers anyway

#

I just know that you don't need an Account for it. Cause you can launch multiple Dedicated Servers on one machine.

#

Even if no client is using it that would already mean you need x Accounts logged in on one machine :D

winged badger Jul 25, 2019, 11:24 AM

#

also means that steam interfaces that depend on client running don't work on dedis

unique thunder Jul 25, 2019, 12:04 PM

#

I have a server RPC that spawns an actor but for some reason it spawns 2 each time. This Switch doesn't help and the sequence is not firing twice (?)

📎 unknown.png

thin stratus Jul 25, 2019, 12:08 PM

#

Anyone ever had to deal with a Platform that requires third party services to be opt-in?
Kinda wondering how it should work if you have a backend system, that is completely required to play the game and a user says "I don't want to link my XYZ account with your backend.".

#

Just kick them out of the game :D?

#

Luckily it's a F2P game

unique thunder Jul 25, 2019, 12:51 PM

#

@thin stratus Yes -- what usually happens is the platform will request that you use their platform-specific user ID for the player(s) by default. We had our own DB of players and used it to prevent duplicate use of usernames amongst other things but when it came to this particular platform where we were forced to use the platform-specific ID, we used it as a display name but registered the user with an added character in the backend if the username had already been created. Then, in-game we displayed their platform along with their username and if two users had the same name, the platform icon would separate them.

This set-up doesn't require the user to agree to being signed up to the database or to even know that this happens at all because we didn't collect any information aside from their username and our privacy policy / terms of use covered that.

thin stratus Jul 25, 2019, 2:41 PM

#

The RPC can also be in the Character

#

But the idea is the same

#

KeyPress -> RPC in a ClientOwnedActor -> Trace the Car -> Possess the Car.

#

And where is it failing?

#

You gotta do some debugging yourself :P

#

Is your function fully executing?

solar stirrup Jul 25, 2019, 3:07 PM

#

Should the raycast for picking up an item be done in the client or server?

thin stratus Jul 25, 2019, 3:09 PM

#

Server

bright perch Jul 25, 2019, 3:09 PM

#

@solar stirrup server

thin stratus Jul 25, 2019, 3:09 PM

#

You can perform it on both

#

But the Client would only do visual stuff

#

So the delay is not the big

solar stirrup Jul 25, 2019, 3:09 PM

#

Aight

#

With high latency, wouldn't that cause some issues with the server's raycast missing the item? Or is that just acceptable

thin stratus Jul 25, 2019, 3:13 PM

#

Well we are talking about prediction

#

The Characters Movement on the Server should, at the time of the RayTrace, but somewhat the same

#

The movement is predicted too so

#

High Ping will never be nice

chrome bay Jul 25, 2019, 3:18 PM

#

For getting into vehicles etc, I do the trace client side. If client thinks they can get in a vehicle they tell the server, then server does some sanity stuff

#

I.e checking distance etc

#

Bit easier that way

copper grove Jul 25, 2019, 3:22 PM

#

does anyone have any good sources/links on how to setup mordentral's advanced voice (from the advanced sessions plugin)?

brittle karma Jul 25, 2019, 3:23 PM

#

a client overlaps an item and add the item to its inventory(others cant see that so nothing to replicate), when item gets overlapped it calls a function for that instagator pawn, and becuz server should handle this, so it calles an RPC function and in the _Implementation part Player Controller gets called(becuz every one has specific player controller its a best place for that isnt it?) is it a true implementation? or becuz i call player controller inside an RPC it will always will return Server's PC? cuz when ever client overlaps an item, it counts for server /:

solar stirrup Jul 25, 2019, 3:31 PM

#

Can my RPC function be virtual?

chrome bay Jul 25, 2019, 3:34 PM

#

the _Implementation / _Validate part can yeah

#

That used to be the default in ye olden days with GENERATED_UCLASS_BODY

solar stirrup Jul 25, 2019, 3:34 PM

#

aight

#

I suppose I should only make the RPC itself public and the _Implementation and _Validate functions protected right?

#

or will the engine not like that

chrome bay Jul 25, 2019, 3:37 PM

#

Not sure to be honest, but i doubt it matters. You never call those variations manually anyway

solar stirrup Jul 25, 2019, 3:38 PM

#

Yeah but I don't want other devs to accidentally do that haha

#

Well, would probably be cleaner anyway

chrome bay Jul 25, 2019, 3:38 PM

#

I always have them next to each other, just makes it easier to read

solar stirrup Jul 25, 2019, 3:45 PM

#

good point

#

If I need to validate a Server RPC which isn't critical (moving an item from a slot to another), do I really want to use the validate function instead of checking inside the implementation?

#

IIRC Validate kicks the player for an invalid RPC right?

chrome bay Jul 25, 2019, 4:07 PM

#

it'll kick them if it returns false yeah

#

most of the time to be honest I don't find it all that useful, but it's handy if you know a player is outright cheating

#

But then you may want to ban, kick with a message etc. I think it's just a bit of a relic tbh

solar stirrup Jul 25, 2019, 4:09 PM

#

yeah

#

I'd love it if they let us choose the "sanction"

fleet raven Jul 25, 2019, 4:12 PM

#

in 4.23 Server finally no longer requires WithValidation

chrome bay Jul 25, 2019, 4:17 PM

#

Oh really? Nice! Must have missed that

#

About bloody time tbh

grizzled stirrup Jul 25, 2019, 4:21 PM

#

@fleet raven That's amazing, so you can skip the validation function entirely?

#

Will clean up so much of my .cpp files if so

#

Do you need to specify something like WithoutValidation in the header or just omit WithValidation?

fleet raven Jul 25, 2019, 4:22 PM

#

just remove the WithValidation

grizzled stirrup Jul 25, 2019, 4:22 PM

#

Incredible

#

Can't wait to upgrade

chrome bay Jul 25, 2019, 4:23 PM

#

99.9% All my validates are in my headers with return true.. going to be weird to get used to removing that

grizzled stirrup Jul 25, 2019, 4:23 PM

#

Me too

fleet raven Jul 25, 2019, 4:23 PM

#

nah it'll be fine

grizzled stirrup Jul 25, 2019, 4:24 PM

#

Is there a ever a list of these kind of nitty gritty changes posted anywhere?

#

Maybe the full release notes will mention it

fleet raven Jul 25, 2019, 4:24 PM

#

just skim over the commit titles every few days

chrome bay Jul 25, 2019, 4:25 PM

#

full release notes will mention it yeah

#

well, should do anyway

fleet raven Jul 25, 2019, 4:25 PM

#

most likely

#

release notes don't mention everything

#

but a ton

grizzled stirrup Jul 25, 2019, 4:27 PM

#

Also do you generally upgrade any production projects you might be working on to newer engine versions? Just keeping a wary eye out for things that might break? I did hear some advice to pick an engine version for a project and stay with it, but some of these 4.23 changes are so tempting

#

Sorry a bit off topic I'll delete in a min

fleet raven Jul 25, 2019, 4:27 PM

#

I upgrade our project on release day every time and never had a problem

grizzled stirrup Jul 25, 2019, 4:27 PM

#

Damn that's very encouraging

#

Thanks!

#

I guess as long as it compiles and the log isn't yellow or red, it's all good 😄

chrome bay Jul 25, 2019, 4:28 PM

#

Yeah I usually do the same, even for previews (though not on any live product)

fleet raven Jul 25, 2019, 4:28 PM

#

of course there's always going to be some work migrating things and fixing random stuff but no show stoppers

chrome bay Jul 25, 2019, 4:28 PM

#

Regretted it for preview 2 since Epic completely screwed up BP

#

but yolo

grizzled stirrup Jul 25, 2019, 4:28 PM

#

Just things like includes moving and functions being deprecated right?

fleet raven Jul 25, 2019, 4:28 PM

#

I never use preview versions

grizzled stirrup Jul 25, 2019, 4:28 PM

#

I'm not good enough with C++ to fight anything more complicated than those

#

And yeah I'd stay away from preview

chrome bay Jul 25, 2019, 4:28 PM

#

I wouldn't use them on anything far along

fleet raven Jul 25, 2019, 4:29 PM

#

yeah mostly just updating the api

#

migrating our random bug fixes to the engine/removing those that aren't useful anymore

#

etc

grizzled stirrup Jul 25, 2019, 4:29 PM

#

Ah that's a step I don't even have to worry about thankfully

#

Using binary build

fleet raven Jul 25, 2019, 4:30 PM

#

currently doing that by duplicating the branch and then rebasing the copy to the new engine version

#

that lets me resolve conflicts for every individual commit instead of having a single merge make a mess

grizzled stirrup Jul 25, 2019, 4:32 PM

#

I wonder if that strange bug in 4.22 that was absolutely eating up bandwidth per player for no reason is still around

#

Not even sure if it's been reported, just talked about here. I'll submit a report if not

fleet raven Jul 25, 2019, 4:33 PM

#

haven't heard of this issue, any details?

grizzled stirrup Jul 25, 2019, 4:33 PM

#

One sec it's in the logs

chrome bay Jul 25, 2019, 4:34 PM

#

same, news to me

grizzled stirrup Jul 25, 2019, 4:34 PM

#

PlayerCameraManager->bUserClientSideCameraUpdates = false fixes it

#

Sends an RPC on tick and doesn't do anything if you don't need it

#

Erebel found it

#

For players that have high framerates it's a gigantic bandwidth cost for nothing

fleet raven Jul 25, 2019, 4:35 PM

#

oh wow that sounds egg

grizzled stirrup Jul 25, 2019, 4:35 PM

#

I was trying to figure out why my simple 2 player co op game was easily saturating the bandwidth

#

Turns out it was just the framerate combined with that bug

#

Night and day difference when it's set to false and of course that scales with the amount of players

fleet raven Jul 25, 2019, 4:43 PM

#

turned it off but doesn't seem to make too much of a difference

timid moss Jul 25, 2019, 5:03 PM

#

Can enums be replicated?

chrome bay Jul 25, 2019, 5:04 PM

#

yeah

timid moss Jul 25, 2019, 5:06 PM

#

neado

fleet raven Jul 25, 2019, 5:33 PM

#

is there a simple way to stop an actor from replicating to new clients without cutting off the replication to existing ones?

chrome bay Jul 25, 2019, 5:34 PM

#

IsNetRelevantFor maybe?

fleet raven Jul 25, 2019, 5:34 PM

#

I'm not sure how I'd determine whether the client already knows about the actor

#

and returning false would stop replicating it to existing clients

chrome bay Jul 25, 2019, 5:34 PM

#

Ah I see what you mean

#

In that case nothing I can think of, I mean you could tear it off and the clients that already have it wouldn't kill it, but wouldn't get any future updates either

fleet raven Jul 25, 2019, 5:36 PM

#

tear off would completely close the channel right? so they wouldn't get the signal when the server has finally deleted the actor

chrome bay Jul 25, 2019, 5:36 PM

#

yeah the clients would take it over and have to destroy it locally then

fleet raven Jul 25, 2019, 5:36 PM

#

hmm

chrome bay Jul 25, 2019, 5:37 PM

#

Although, I've never bothered finding out what bNetForce does if you pass it into Destroy().. maybe that does something useful

fleet raven Jul 25, 2019, 5:40 PM

#

bNetForce allows the client to destroy replicated actors

chrome bay Jul 25, 2019, 5:41 PM

#

ah not that useful in this case then

fleet raven Jul 25, 2019, 5:41 PM

#

can I just point out how epic this comment is

📎 unknown.png

chrome bay Jul 25, 2019, 5:41 PM

#

10/10

fleet raven Jul 25, 2019, 5:41 PM

#

oh well

#

I guess I can stick a replicated var in it with cond=initialonly

#

and when the client has it on init it just goes and destroys it again with bNetForce=true

#

br_big_brain

#

that doesn't entirely work as intended but good enough

twin juniper Jul 25, 2019, 5:51 PM

#

im doing some netProfiling and im chopping things up here and there, but one thing that i cant seem to understand is AttachmentReplication

#

seems to be something that replicates because of attached actors like you would expect... but why does it keep replicating thousands of times even though the property doesn't need to ever change ??

#

in scene there are 400 actors attached to 200 individual actors, so it should change ~400 times right ?

#

not 6000+ lol

chrome bay Jul 25, 2019, 5:54 PM

#

You sure it's not just replicating to multiple clients?

twin juniper Jul 25, 2019, 5:54 PM

#

only one client running

chrome bay Jul 25, 2019, 5:54 PM

#

Couldn't tell you without debugging it but yeah it's for replicating the actors attachment to something else.

twin juniper Jul 25, 2019, 5:55 PM

#

i have another property on those same actors that are set to "initialOnly" and they only fire off 400 times like you would expect

chrome bay Jul 25, 2019, 5:55 PM

#

Both ReplicatedMovement and AttachmentReplication are replicated using REPNOTIFY_Always - it might be that the server just flings it out all the time

twin juniper Jul 25, 2019, 5:56 PM

#

oh wow

chrome bay Jul 25, 2019, 5:56 PM

#

Not sure off the top of my head though, usually that's just a client-side thing IIRC

#

Yeah, I'm sure that's client-side only

twin juniper Jul 25, 2019, 5:57 PM

#

its in the server's netProfile thing though?

#

the server is considering AttachmentReplication for replication even though its never changed, and is sending it to the one client

#

it might be like you said a sideeffect of repNotify_Always

chrome bay Jul 25, 2019, 5:58 PM

#

Oh, yeah well it will always consider properties - but it shouldn't send them unless it doesn't match the last-sent value

#

It does store the relative transform as well as the attach point, so it might be that tiny changes cause it to replicate

#

Going to dig into that repnotify always hunch now because that would be infuriating if so

#

you have to be shitting me

#

I really hope I'm wrong, but RepLayout::DiffProperties_r always considers a property different if it has REPNotify_Always

#

Why is that not documented anywhere ffs

worthy perch Jul 25, 2019, 6:11 PM

#

So does ELifetimeRepNotifyCondition take priority over ELifetimeCondition?

chrome bay Jul 25, 2019, 6:11 PM

#

No that's slightly different

#

but ELifetimeRepNotifyCondition basically will replicate a property even if it hasn't changed if set to REPNOTIFY_Always

fleet raven Jul 25, 2019, 6:12 PM

#

that doesn't seem right

#

it would make fortnite send thousands of useless attachments per second

chrome bay Jul 25, 2019, 6:13 PM

#

Well Fortnite uses a lot of network dormancy, but otherwise I couldn't say

#

Trying to navigate my way through this spiderweb of code, but this is disconcerting:

            {
                bDifferent = true;```

#

I'm hoping that's just client-side but still trying to confirm

#

I suppose I could just test it lol

#

brb

brittle karma Jul 25, 2019, 7:19 PM

#

if (Role == ROLE_Authority) {
//store the pawn which overlapped the item
InstegatorPawn = Cast<AMultiplayerBallsBall>(OtherActor);
InstegatorPawn->UpdateLaserAmo(LaserPower);
}
guys the code block above only runs by server right? but when i play with client this block gets called

ocean geyser Jul 25, 2019, 7:24 PM

#

i have a question, i think this would be more tailored to the game instance and player controllers. im setting up a simple character selection menu, when a character is selected it stores the UClass of the character in my game instance (this is getting set before the player joins a server). ive tried about 4 different methods on getting ahold of this specific UClass to match it to the player controller with no luck. the most recent method i tried was (this is after joining the server, trying to set the UClass while connected) creating a struct that contains the player controller and the UClass and storing it on the servers game instance in an array of those structs. This didnt work as it seems the player controllers change after a level load lol. ive completely started from scratch again on trying this. im looking for ideas on ways that i could have the player select a character at the main menu, store the UClass of that selected character on the game instance (already done), then when the player joins the server, i would like the server to get ahold of the UClass of the player somehow, preferably without the client sending it if possible, as well as have some sort of unique ID for that player stored with the UClass on the server for changing levels.

so client sets character selection before joining server. client joins server (server lobby level), server stores the client ID with the selected character UClass. the game starts and all clients travel to the game level, id need an idea on a way to spawn that characters UClass (can store it on the servers game instance) and have the correct player controller possess it. im not sure how i would be able to figure out which player controller would correspond to the correct selected character

#

@brittle karma yes that code would only run on the server. how are you testing to know if the code is being ran on the client?

brittle karma Jul 25, 2019, 7:25 PM

#

GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Blue, FString::Printf(TEXT("%s"), *InstegatorPawn->GetName()));

ocean geyser Jul 25, 2019, 7:26 PM

#

depending on how it is being called, the server could be running the code. how is the function being called?

brittle karma Jul 25, 2019, 7:29 PM

#

its inside Overlap event, whenever the item gets overlap this gets called, however this should only respond to server, but whenever client overlap somthing this reacts like its server

#

void AP_Laser::OnOverlapBegin(UPrimitiveComponent* OverlappedComp, AActor* OtherActor, UPrimitiveComponent* OtherComp,int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult)
{
//destroy the item when overlapped
Super::OnOverlapBegin(OverlappedComp, OtherActor, OtherComp, OtherBodyIndex, bFromSweep, SweepResult);

// Server Should Be Authorize for this replicated actor
if (Role == ROLE_Authority) {

// some code
}
}

ocean geyser Jul 25, 2019, 7:30 PM

#

is the laser like a bullet thats being shot?

brittle karma Jul 25, 2019, 7:30 PM

#

yes

ocean geyser Jul 25, 2019, 7:31 PM

#

are you spawning that laser on the server when you shoot?

#

like so it only is shooting the laser on the server?

brittle karma Jul 25, 2019, 7:31 PM

#

yes the OnFire function is a RPC

#

ah no i got u wrong everyone can shoot

ocean geyser Jul 25, 2019, 7:32 PM

#

well that overlap even is being run on the server then, so your Role == ROLE_Authority check will be true

#

let me rephrase and tell me if im understanding you

#

the client clicks their mouse to shoot which calls OnFire. OnFire calls a server RPC function so the laser is spawned on the server?

brittle karma Jul 25, 2019, 7:36 PM

#

yes the spawning part is inside Server_OnFire_Implementation

ocean geyser Jul 25, 2019, 7:36 PM

#

alright, then that overlap event is being ran on the server, which is why Role == ROLE_Authority is true

brittle karma Jul 25, 2019, 7:37 PM

#

let me describe this way

#

i have a laser pack in the scene which i implemented the Overlap event in its class. now when i overlap that Pack i expect only server call the if block. the spawning laser to the scene has nothing to do with an item

#

when i play with client, the if gets called too. why?

#

📎 1.PNG

#

its like this. i myself put those things items into the scene

ocean geyser Jul 25, 2019, 7:44 PM

#

out of curiosity, in the if block try

if (Role == ROLE_Authority)
{
    if (Role < ROLE_Authority)
    {
        UE_LOG(LogTemp, Warning, TEXT("THIS IS A MESSAGE FROM THE CLIENT"));
    }
}

THIS IS A MESSAGE FROM THE CLIENT should not appear in the log. also keep in mind, testing multiplayer related stuff in the editor can make some issues that are not actually issues apparent, so for testing mp stuff i recommend testing outside of the editor

#

i dont think its actually running on the client, i think its just the editor throwing you off

brittle karma Jul 25, 2019, 7:46 PM

#

no the message didnt appear

lost inlet Jul 25, 2019, 7:46 PM

#

that's a weird sequence of ifs, to the point that it will never log

brittle karma Jul 25, 2019, 7:47 PM

#

yeah it would never happen

lost inlet Jul 25, 2019, 7:47 PM

#

unless you meant the second one to be RemoteRole

ocean geyser Jul 25, 2019, 7:47 PM

#

because its running on the server, it was more so to prove a point unless im still not understanding shayan's question properly

#

the overlap even is being ran on the server, even when a client walks into it, so the Role == ROLE_Authority is going to run

brittle karma Jul 25, 2019, 7:48 PM

#

now this makes sense

ocean geyser Jul 25, 2019, 7:48 PM

#

did that clear it up a bit?

brittle karma Jul 25, 2019, 7:48 PM

#

yeah very

ocean geyser Jul 25, 2019, 7:48 PM

#

sweet

brittle karma Jul 25, 2019, 7:53 PM

#

guys one question im working on it like the whole day but i cant figure it out.
when ever i overlap this item i want the pawn who overlapped the item add it to its ammos.
now i do it this way. in Pawn class i call a RPC (server)function so server is responsible for updating the pawns ammo numbers. this here everything is fine everyone get the accurate update, now as we know Player Controller is the best place for having the info about clients ammo info and send the information to the UMG

#

is it ok that im calling PlayerController inside RPC function? i think it always call the server's PlayerController cuz when ever client puts the item it counts for server

#

📎 1.PNG

ocean geyser Jul 25, 2019, 7:56 PM

#

on the players character (or weapon/ammo component, wherever you have your ammo), make your ammo variable replicated. then have the server simply modify your ammo variable. when the server modifies your ammo variable, it will translate down to the client as well

#

you can see a quick example of this in my health tutorial video. ill explain how im doing it
the player presses E that calls a function that sends a ray from the character to about 5 feet infront of the character to pick something up (in your case, the overlap event). if the ray hit something, it calls a Server RPC function that sends the ray out again but on the server (in your case, this would be the same as your if (Role == ROLE_Authority) check because only that code is running on the server). then if the server hit something with that ray (meaning your if (Role == ROLE_Authority) check in your overlapped event returned true), then it simply modified the health variable (in your case ammo) thats on my characters health component (or your weapon component(wherever you have your ammo stored)). because the health (ammo) is replicated and being modified from the server, the client will have its health (ammo) value change as well and the client is not the one change its health (ammo), so simply trying to change the ammo value via something like cheat engine wouldnt really work if you set it up properly which it seems you have

https://www.youtube.com/watch?v=rJA2KBK1jgU

YouTube

Sneaky Kitty Gaming

Unreal Engine C++ Multiplayer Survival Series #5: "Health + med ki...

In this video we setup the base for our health and doing some code improvements. We will be setting ourselves up to take damage in the next video. Download t...

▶ Play video

brittle karma Jul 25, 2019, 8:03 PM

#

well thanks for the help. Amazing 👌

ocean geyser Jul 25, 2019, 8:04 PM

#

np and goodluck

#

now time to post my question since its lost in the wall of text lol

i think this would be more tailored to the game instance and player controllers. im setting up a simple character selection menu, when a character is selected it stores the UClass of the character in the clients game instance (this is getting set before the player joins a server). ive tried about 4 different methods on getting ahold of this specific UClass to match it to the player controller with no luck. the most recent method i tried was (this is after joining the server, trying to set the UClass while connected) creating a struct that contains the player controller and the UClass and storing it on the servers game instance in an array of those structs. This didnt work as it seems the player controllers change after a level load. ive completely started from scratch again on trying this. im looking for ideas on ways that i could have the player select a character at the main menu, store the UClass of that selected character on the players game instance (already done), then when the player joins the server, id like to be able to store the selected characters UClass (thats stored in the clients game instance) and that players playercontroller(or other way to identify the player on PostLogin/HandleStartingNewPlayer_Implementation) on the servers game instance so that when the game goes from the lobby to the actual game map, the players selected character can be spawned and they can possess it. i cant figure out how to store the info i need on the server(i can store the UClass easily but cant figure out what i can do to let the server know which UClass belongs to which character in the PostLogin/HandleStartingNewPlayer_Implementation functions since the playercontroller changes from the lobby to the actual play level). just looking for ideas to try out

twin juniper Jul 25, 2019, 9:43 PM

#

Has anyone had luck with dedicated server building on 4.22

jade gazelle Jul 25, 2019, 10:01 PM

#

I’ve been cooking / building dedicated server on 4.22.3 w/o issue

#

@ocean geyser You can do it via 2 RPCs on the player controller. The first RPC is fired from the server to the connecting client on PostLogin, call this one RequestPlayerClass or something, all it does is trigger the 2nd RPC which you’ll send from client to server. The 2nd RPC can grab the class from the client side Game instance and then pass it in as a parameter to the server. Then when the server receives that 2nd RPC from the client they just spawn the actor with the class reference and possess it

twin juniper Jul 25, 2019, 10:21 PM

#

Interesting, I'm building the UE4 Development Editor now from source, we'll see if I get things to work.

#

Tried doing this a few months ago on 4.19 and it wasn't working no matter what I did

winged badger Jul 25, 2019, 10:26 PM

#

@ocean geyser when does the player join the server? in the lobby or on a level where you need to spawn the characters?

#

because what you're describing sounds like a hard server travel

#

if it is (players connected to the lobby, then reconnect to the game map)

#

first, you should really use seamless travel, especially if its in combination with steam

#

and second, even with hard travel you can override PlayerState's CopyProperties function to transfer the UClass* (or w/e you need to) to a new PS, even if its of a different class

ocean geyser Jul 25, 2019, 11:35 PM

#

it is with a hard server travel right now as i havent bothered to integrate steam yet while testing. i thought you had a new player controller even with seamless, if not then that would be very convenient for this. im trying to make it work with both seamless and non seamless, i have a new idea in mind on how to do it by generating a random ID for each player upon them starting their game and using that as means of identifying them. thanks guys

twin juniper Jul 25, 2019, 11:48 PM

#

90 minutes later the editor is done building... lol

somber glade Jul 26, 2019, 12:04 AM

#

Setting actor tick enabled. Is that something that needs to be replicated?

ocean geyser Jul 26, 2019, 12:26 AM

#

id think so if you wanted it to run on client and server, i would think it depends on where its set from. if its set to be enabled on the client then it will probably only run on the client, if its done on the server then its probably done on the server

gleaming vector Jul 26, 2019, 12:26 AM

#

hey, @winged badger or @pallid mesa have either of you tried to rename a UObject to change it's Outer before replicating it?

pallid mesa Jul 26, 2019, 12:30 AM

#

not really, no. That sounds very specific, what are you trying to do?

#

@gleaming vector @ me I gtg sleep 2:30 am here 💤

gleaming vector Jul 26, 2019, 12:34 AM

#

ah, go to bed

pallid mesa Jul 26, 2019, 12:34 AM

#

you can always leave me a message, I'll read it tomorrow then

gleaming vector Jul 26, 2019, 12:35 AM

#

but, I have some object (Item Stack) that is part of a "World Object" (basically, the dropped item in the world, it's an actor with a model), and when I pick it up as a player I put it into my inventory and destroy the Item World Object

#

in singleplayer, this works just fine

#

however, in multiplayer, I can't replicated down the Item Stack when I switch it from the world object to the inventory

#

unless I rename it to give it the same outer

#

as the object replicating

#

however, on the client, it didn't get the rename

grizzled bay Jul 26, 2019, 12:35 AM

#

if you want it to destroy on all, you should destroy it from the server

gleaming vector Jul 26, 2019, 12:36 AM

#

i dont want to destroy the item stack

#

I want to move it from the actor that holds it to the inventory on the player

grizzled bay Jul 26, 2019, 12:36 AM

#

or decrease it form server

gleaming vector Jul 26, 2019, 12:36 AM

#

of course that is done on the server

grizzled bay Jul 26, 2019, 12:36 AM

#

also move it form server

gleaming vector Jul 26, 2019, 12:36 AM

#

the problem is that when you go to ReplicateSubobjects, it replicates down, but on the client it still sees the old outer

#

so the client complains and doesn't accept the replication

#

i hit this in DataChannel.cpp:3240

#

        if ( !SubObj->IsIn( Actor ) )
        {
            UE_LOG( LogNetTraffic, Error, TEXT( "UActorChannel::ReadContentBlockHeader: Sub-object not in parent actor. SubObj: %s, Actor: %s" ), *SubObj->GetFullName(), *Actor->GetFullName() );

            if ( IsServer )
            {
                Bunch.SetError();
                return NULL;
            }
        }```

pallid mesa Jul 26, 2019, 12:38 AM

#

pool the world entity object until you get your memo on your inventory

#

you might be suffering from premature destroy

gleaming vector Jul 26, 2019, 12:38 AM

#

I don't update the inventory on the client until I get this object though

pallid mesa Jul 26, 2019, 12:38 AM

#

but what you say sounds totally, fine. You need to change the outer, yes.

gleaming vector Jul 26, 2019, 12:39 AM

#

and it fails to read this bunch

#

this all makes sense though, because the name (including the outer) is supposed to be stable

#

and I'm explicitly changing it

pallid mesa Jul 26, 2019, 12:40 AM

#

mh.. I'd need to see the execution flow. Try watching for this object on the different roles when you pick it up.

#

put a breakpoint and see if it does something weird

gleaming vector Jul 26, 2019, 12:41 AM

#

I'm just wondering how I make it work in this situation

#

i have

#

it all comes down to the fact that the act of renaming isn't replicated to the client

pallid mesa Jul 26, 2019, 12:42 AM

#

I don't actually know how that renaming you are doing works. But if it's easy enough for you I'd try to replicate it manually and see what happens, really, empirically.

gleaming vector Jul 26, 2019, 12:42 AM

#

I'm just doing this

#

{
    //We can't do this on clients
    if (GetOwnerRole() != ROLE_Authority)
    {
        return false;
    }
    
    if (!AcceptsItem(Item, ItemSlot))
    {
        return false;
    }

    if (IsValid(Item))
    {
        Item->Rename(nullptr, GetOwner());
    }

    //Place the item into the slot
    FArcInventoryItemSlot& Slot = GetItemSlot(ItemSlot);
    UArcItemStack* PreviousItem = Slot.ItemStack;
    Slot.ItemStack = Item;



    //Inform the world that we have placed this item here
    OnInventoryUpdate.Broadcast(this);
    OnItemSlotChange.Broadcast(this, ItemSlot, Item, PreviousItem);
    
    GetOwner()->ForceNetUpdate();
    return true;
}```

grizzled bay Jul 26, 2019, 12:43 AM

#

are you also replicating the name you are changing?

pallid mesa Jul 26, 2019, 12:44 AM

#

Item->Rename(nullptr, GetOwner());
I'll take a look tomorrow into this

gleaming vector Jul 26, 2019, 12:44 AM

#

it changes the outer

#

first param is the FName

#

if you pass it nullptr, it doesn't change the name

#

second is the outer, again, give it nullptr it doesn't change it

#

it's one of those fun engine functions that do two different things

pallid mesa Jul 26, 2019, 12:46 AM

#

I meant the actual code hehe, but still try to move this "IsValid(Item)" to the top of the function call so it gets called not only on authority but on the client. DISCLAIMER: I'm not sure in which context you are calling this function

gleaming vector Jul 26, 2019, 12:46 AM

#

this is only called on server

#

no prediction of adding items to inventory

#

because that was just a headache and I gave up on it

#

since it would have to be transactional and undoable

#

and that was a lot of work

pallid mesa Jul 26, 2019, 12:47 AM

#

fair enough 😄

gleaming vector Jul 26, 2019, 12:47 AM

#

so i just said fuck it, i'll just do this on the server only

pallid mesa Jul 26, 2019, 12:47 AM

#

Any of my interaction systems got prediction and they just work fine

#

so... yeah, not needed (unless you are a geek hehe)

gleaming vector Jul 26, 2019, 12:47 AM

#

client tells the server "hey i know about this world object and I want it in my inventory" and it replicates back through TArray replication

pallid mesa Jul 26, 2019, 12:48 AM

#

okay, so try momentaniously to let every client know about that outer change

#

using a multicast or something along the lines

gleaming vector Jul 26, 2019, 12:48 AM

#

I'm not sure how, I can't reference this UObject once it gets into this state

pallid mesa Jul 26, 2019, 12:48 AM

#

see if with that anything changes, and by then you can draw some conclusions with your issue

gleaming vector Jul 26, 2019, 12:48 AM

#

since the client and server disagree about the name

#

I'd have to hold the item stack around

#

the ActorChannel class straight up stops deserializing any bunch that references a UObject in this state

#

maybe i should just completely invalidate it

#

and force the client to construct a new subobject

#

give it a new net guid and everything

pallid mesa Jul 26, 2019, 12:51 AM

#

Okay.. I think I comprehend now the situation, but at this point without debugging glasses couldn't tell

#

the easy way of course is just rebuilding your object

gleaming vector Jul 26, 2019, 12:51 AM

#

yeah

#

the biggest issue is that it's polymorphic

#

so I don't know if subclasses will even rebuild it properly

#

and that's just a bug waiting to happen

pallid mesa Jul 26, 2019, 12:52 AM

#

but if you can pass it around is even better. Another option is having a dummy object on your inventory to save your data. Like a little mono-pool

#

problem with that is that it's thought for a DOD approach rather than a inheritance approach

gleaming vector Jul 26, 2019, 12:52 AM

#

yeah

#

I'm going to try a full rename and invalidate the netguid

#

that will mean the client treats it as a brand new object

#

but, that would break any attempt to hang onto the object pointer

#

hmm

pallid mesa Jul 26, 2019, 12:54 AM

#

let me know how that goes 😃 probably zlo will be around tomorrow, he might know the "proper way" unfortunately the kind of design patterns I've used never faced such a problem

gleaming vector Jul 26, 2019, 12:54 AM

#

yeah, I'm just asking anyone who may have done something similar

#

I also have a UDN post about it out there

#

I really want instanced item stacks

#

that can be blueprinted

#

i have so many ideas with these

pallid mesa Jul 26, 2019, 12:55 AM

#

If you need a quick solution, just create a new object, really.

gleaming vector Jul 26, 2019, 12:55 AM

#

yeah

#

but like I said, that breaks any attempt on the client to hang onto an item reference

pallid mesa Jul 26, 2019, 12:55 AM

#

just leave it as a TODO. But at least you'll be able to keep prototyping

gleaming vector Jul 26, 2019, 12:55 AM

#

oh, I can prototype in singleplayer

#

or, as long as the first actor to hold onto the item stack is my player

#

it replicates fine

#

the problem is when you rename it

#

so, picking up an item off the ground

pallid mesa Jul 26, 2019, 12:56 AM

#

that breaks any attempt on the client to hang onto an item reference it depends on how and when you create your object

#

anyways Roi, I'm falling sleep XD

gleaming vector Jul 26, 2019, 12:56 AM

#

yeah, go to sleep

pallid mesa Jul 26, 2019, 12:57 AM

#

talk to you tomorrow, let me know if anything :)

gleaming vector Jul 26, 2019, 12:57 AM

#

thanks for staying up and at least listening to the problem 😃

pallid mesa Jul 26, 2019, 12:57 AM

#

😄

twin juniper Jul 26, 2019, 12:58 AM

#

Hey guys, I just finished building my server.exe for a dedicated server, but it's crashing with the following error

https://pastebin.com/FqgmxGcB

Pastebin

LogOnline: Display: STEAM: Loading Steam SDK 1.39 LogStreaming: D...

grizzled bay Jul 26, 2019, 12:58 AM

#

i am doing pickup related stuff also atm, my main problems are more related to making an event running as server update the player widgets :/

twin juniper Jul 26, 2019, 12:58 AM

#

Has anyone seen this error before or might know how to resolve it?

lost inlet Jul 26, 2019, 1:20 AM

#

LogLinker: Warning: Unable to load package (../../../../../Desktop/UnrealEngine-release/Engine/Content/Animation/DefaultAnimCurveCompressionSettings.uasset). Package contains EditorOnly data which is not supported by the current build.
LogWindows: Warning: CreateProc failed: The system cannot find the file specified. (0x00000002)

#

well that'll be why

#

you're probably hard referencing that asset somewhere but it's editor only

ocean geyser Jul 26, 2019, 1:28 AM

#

does the player controller change even when you use seamless travel?

somber glade Jul 26, 2019, 1:30 AM

#

@ocean geyser Yeah, I guess I need to go through then and see if I have something that needs to run on the client during tick. If the player drops a weapon, after a moment it'll automatically fly back to their waist socket. So if it is dropped, it'll enable a book, if that bool is true on tick, it'll lerp from wherever it is, to the waist location and then run an attachment. Would the location of the object be handled simply by replicating the object and movement or would i need to replicate that whole thing ?

ocean geyser Jul 26, 2019, 1:31 AM

#

it would be better imo to replicate the event rather than replicating the objects movement. such as when you drop an object, call a multicast from the server

grizzled bay Jul 26, 2019, 1:37 AM

#

if i have a function run as server, is there a way to stop all functions in that from running as server also,

ocean geyser Jul 26, 2019, 1:38 AM

#

can you be more specific? what is it your trying to do

grizzled bay Jul 26, 2019, 1:42 AM

#

i am adding an item to a player inventory. i have a function called OnPickedUp which runs from the server, it then calls an add item function from the players inventory while still as server , that event then calls an add item (internal) function from the players inventory still as server. that add item internal function then calls a function to update the players slots. at that point, it is all widget based which the server can't access, so i need it to stop running from server and use the initial players references

somber glade Jul 26, 2019, 1:44 AM

#

@ocean geyser It's a VR game, so I have a timer set. When the player stops gripping the weapon, a 2 second timer starts, and after 2 seconds it sets the bool that will lerp the weapon from its current location to the belt, but I call it on tick since the lerp needs to be called over and over to make it all the way there. once it's in range of the belt socket it attaches it. and then disables the bool.

#

it then turns off the tick of the weapon as it doesn't need to tick when it's attached

grizzled bay Jul 26, 2019, 1:44 AM

#

there is more after the initial add item function that needs to run after as server also, so i only need to go back to the client player temporarily before continuing as server

ocean geyser Jul 26, 2019, 1:45 AM

#

just a thought, what about either calling an RPC from the server to the client, or replicate your inventory items array with the condition of owner (so it replicates only on your client) and then set it as replicatedusing with your function that updates your player slots?

grizzled bay Jul 26, 2019, 1:48 AM

#

the array is being replicated fine, but i can only updated the widget info from client, but the server can't access the clients widgets so the player has the items but can't see them atm. i guess ill have to handle it differently through multiple calls instead of chaining them in the add item function

ocean geyser Jul 26, 2019, 1:49 AM

#

crossmr, when the user lets go of the weapon, replicate the weapons movement, then once its attached disable the weapons movement replication would be the easiest route but wont look super smooth to other clients

somber glade Jul 26, 2019, 1:50 AM

#

Hmm.. yeah we don't want it to look too janky.

ocean geyser Jul 26, 2019, 1:51 AM

#

well it should only take a few minutes to implement if you already have the rest of your code setup, give it a try and see what it looks like. it shouldnt be to bad, but more so little stutters

somber glade Jul 26, 2019, 2:03 AM

#

okayy thanks I'll try that

twin juniper Jul 26, 2019, 2:05 AM

#

So I got my dedicated server to compile and run - Success

#

It's loading the dedicated server map I have setup

#

Will a blueprint print string log to the console? I'm not seeing any output and the advanced session isn't showing up in steam server browser

grizzled bay Jul 26, 2019, 2:08 AM

#

sorry think i got what you meant, just need to work out how to do it properly :/

#

i ended up doing this, which i believe works, i still have other issues to take care of, but by the looks of the debugging it seems to have worked, will have to do more to work out if it actually did. so thanks for the idea it helped a lot

📎 unknown.png

timid moss Jul 26, 2019, 2:29 AM

#

guys why is my Client RPC running on the server?

#

I know I have it set up rightUFUNCTION(Client, Reliable) void ClientOnInventoryInitialized();

#

and then in the .cppvoid UInventory::ClientOnInventoryInitialized_Implementation() { UKismetSystemLibrary::PrintString(this); }

#

I am calling ClientOnInventoryInitialized()in PostInitializeComponents()

ocean geyser Jul 26, 2019, 2:40 AM

#

how are you testing? with 2 players in the editor?

somber glade Jul 26, 2019, 2:44 AM

#

if an RPC makes an interface call, is the interface call on the target actor also being run "on the server"

sour river Jul 26, 2019, 2:45 AM

#

Trying to understand networking in UE4:

Let's say a multiplayer racing game, does it make sense to store the color of each cars in a variable "Color" in the car pawn, set it as "RepNotify" and in OnRep_Color to change the color of car (via material parameter)?

Thanks!

grizzled bay Jul 26, 2019, 2:46 AM

#

as far as i am aware, interfaces (not talking about the blueprint interfaces)/widgets are client only, so if you try to access the clients widget from a server you usually can't, could be wrong

timid moss Jul 26, 2019, 2:50 AM

#

@ocean geyser 1 player PIE

grizzled bay Jul 26, 2019, 2:50 AM

#

if you don'

#

t have dedicated server checked, that 1 player will always be considered server

timid moss Jul 26, 2019, 2:51 AM

#

yeah i do dedicated server

#

i check that box