#multiplayer | Unreal Source | Page 422

next falcon Sep 29, 2018, 12:09 AM

#

okay i have absolutly no idea what that is and how it works..
Why can't epic just split the array in packets ?? or make a bool for it if i want to split it or not i know i could take a longer send time but it would be so much easyer..

grand kestrel Sep 29, 2018, 12:39 AM

#

Lol

#

I'll take the performance

next falcon Sep 29, 2018, 12:40 AM

#

what

cloud ledge Sep 29, 2018, 12:41 AM

#

The problem is that your task is conceptually bad

#

You shouldn't have the need to sync arrays that large

#

What is contained in them that you need to send to clients?

next falcon Sep 29, 2018, 12:41 AM

#

Example: Minecraft sends full chunks from server to client
I want that too

#

its mainly just a int array

meager spade Sep 29, 2018, 12:56 AM

#

minecraft chunks don't get sent in one go, it sends packets of the chunk and the client puts them together

winged badger Sep 29, 2018, 12:57 AM

#

you're warring with that array for 2 months now

#

time to rethink the approach 😛

subtle peak Sep 29, 2018, 1:04 AM

#

Why does this event fail to get the controller of the AI? It works for the host but not for the connected client..

📎 MoveToMP.PNG

#

📎 MoveToMP2.PNG

next falcon Sep 29, 2018, 1:13 AM

#

@meager spade jeah i know but i don't know how i get that into UE4

#

@winged badger Never give up xD

meager spade Sep 29, 2018, 1:15 AM

#

well, you would probably need a nested array with part of the chunk in each one, and rpc the parts of the chunk over and let the client load them parts of the chunk once the checksum is valid for the parts

next falcon Sep 29, 2018, 1:30 AM

#

well i tried that with packets of 2000 and a delay of 0.1 and that works.. BUT if i would test it with chunks from 101010 it would still not work i think
But jeah thats a way i thaught of

meager spade Sep 29, 2018, 1:34 AM

#

@subtle peak clients don't know about any controller except there own

#

even ai controllers

cloud ledge Sep 29, 2018, 1:34 AM

#

@next falcon compress them

#

Do something, break them apart etc

next falcon Sep 29, 2018, 1:35 AM

#

ill keep testing tomorrow
I need some sleep now :)
Good night

subtle peak Sep 29, 2018, 1:37 AM

#

@meager spade Ok I see. What can I do instead then?

meager spade Sep 29, 2018, 1:39 AM

#

well your asking the server to move you, on the client right?

subtle peak Sep 29, 2018, 1:39 AM

#

RTS, I click one or more units to move them

#

but yes

winged badger Sep 29, 2018, 1:58 AM

#

it wouldn't fail to get the controller

#

not if it executed on server, anyhow

#

you do have a "No owning connection for..." log entries in your Output when you call that

#

you also don't need to get a Pawn's Controller from the Pawn to get itself

#

just use Self node

#

(i am assuming here that the controller is AAIController derived, not a PlayerController)

#

you can't send a Server RPC from an object not owned by your PlayerController @subtle peak

grand kestrel Sep 29, 2018, 2:09 AM

#

That's a bit misleading. You can't send a server RPC from an object not owned by your player controller in the parent hierarchy

winged badger Sep 29, 2018, 2:09 AM

#

its not

#

if you go up the chain of owners until the next owner is NULL

#

if that last object is the PlayerController

#

then its owned by a PlayerController

grand kestrel Sep 29, 2018, 2:11 AM

#

I'm aware

winged badger Sep 29, 2018, 2:12 AM

#

bool AActor::HasNetOwner() const
{
    if (Owner == NULL)
    {
        // all basic AActors are unable to call RPCs without special AActors as their owners (ie APlayerController)
        return false;
    }

    // Find the topmost actor in this owner chain
    AActor* TopOwner = NULL;
    for (TopOwner = Owner; TopOwner->Owner; TopOwner = TopOwner->Owner)
    {
    }

    return TopOwner->HasNetOwner();
}

grand kestrel Sep 29, 2018, 2:12 AM

#

Except you're confusing owner and net owner

winged badger Sep 29, 2018, 2:12 AM

#

this, and PC overrides the function to return true

grand kestrel Sep 29, 2018, 2:12 AM

#

I'm aware

#

You said owner not net owner

winged badger Sep 29, 2018, 2:12 AM

#

its both

grand kestrel Sep 29, 2018, 2:13 AM

#

😒 no

winged badger Sep 29, 2018, 2:13 AM

#

technically

grand kestrel Sep 29, 2018, 2:14 AM

#

The reason I said it was misleading is because a beginner would think you're implying the player controller needs to be the owner

#

And it doesn't

#

It just has to lead up the chain to it

winged badger Sep 29, 2018, 2:14 AM

#

fair enough

#

i've said it enough times here by now that i am lazy typing the longer version

#

the net owner concept generates as much confusion though

#

a few tried to SetNetOwner

grand kestrel Sep 29, 2018, 2:16 AM

#

Ah

rose egret Sep 29, 2018, 9:52 AM

#

Global Time Dilation effects Replication of actors or not?

ember needle Sep 29, 2018, 10:13 AM

#

All, I'm getting a LogNetPackageMap: Warning: FNetGUIDCache::SupportsObject: DecalComponent /Game/Maps/Levels/UEDPIE_1_OSA_Level_Test.OSA_Level_Test:PersistentLevel.BP_OSA_PlayerChaser_Military_C_1.DecalComponent_0 NOT Supported. when I spawn a decal attached to a component of a replicated character in MP. Can anyone tell me where I can start looking? I am not performing any replication operations on the decals, using only BP. https://gyazo.com/f6488ba8905be446ac816a716975a62a

Gyazo

rose egret Sep 29, 2018, 10:52 AM

#

@rose egret yes it effects on replication 😦

#

so how do we use real timer for replication instead of dilatated time ? is there any option ?

ember needle Sep 29, 2018, 5:34 PM

#

I cannot find GenericPlayerInitialization or PostSeamlessTravel in overrideable functions in GameMode

#

is this normal?

meager spade Sep 29, 2018, 5:44 PM

#

blueprint ?

north trout Sep 29, 2018, 5:46 PM

#

are there resources on how to do lobby/char select/ correctly?

meager spade Sep 29, 2018, 5:46 PM

#

seems they aint blueprint exposed

ember needle Sep 29, 2018, 5:47 PM

#

yes blueprint

#

so how can i know when all players are ready?

north trout Sep 29, 2018, 6:27 PM

#

why the f*** is my server (its a listen server) when joining keeping the player controller for the lobby instead of switching to the game player controllers like all the other clients

#

this also only happens when using steam, works fine in PIE

cyan bane Sep 29, 2018, 7:11 PM

#

Does anyone know anything about NetSerialization? I've been trying to optimize my replicated structs, but I'm not making the expected bit gains I thought I would, relative to just using FVector_NetQuantize and FRotator_NetQuantize

north trout Sep 29, 2018, 8:05 PM

#

if everybody has the same problem, dont be like me read the damn documentation

copper portal Sep 29, 2018, 8:08 PM

#

hi I need some quick help. I have this respawn system where it add score but I use get 0 and it only adds the score to 1 person. The score is in the player state so I am wondering how I can give the score to the right person instead of only 1 person

#

https://gyazo.com/3678b775c5047d59008f1b9724650262

Gyazo

opaque flicker Sep 29, 2018, 9:04 PM

#

guys question please ! do (PlayerState) variables that i set in the previous level continue to be next map which has the same playerstate class in the world settings ?

#

in multiplayer game for sure

grand kestrel Sep 29, 2018, 9:18 PM

#

@opaque flicker no

opaque flicker Sep 29, 2018, 9:19 PM

#

@grand kestrel so how can i make it presist to all levels that i load ?

#

do i need to use save game BP ?

grand kestrel Sep 29, 2018, 9:20 PM

#

Pass it through the game instance

#

Google it there's tons of info

meager spade Sep 29, 2018, 9:27 PM

#

there is some nice options to copy the playerstate

#

aswell

thin stratus Sep 29, 2018, 9:37 PM

#

@opaque flicker @grand kestrel @meager spade
Mark the GameMode as "SeamlessTravel".
Then use the "CopyProperties" event in the PlayerState to receive the Variables from the OLD PlayerState.

nocturne berry Sep 29, 2018, 9:38 PM

#

hey guys, i am having a problem with the player start rotation in multiplayer. My character is set to rotate with the controller, so he's always facing to where the camera is looking it. When the character spawns he is rotating to 0,0,0. But if i print string in the event begin play, the actor rotation is correct (same as the player start) but the 2nd print string with a delay of - lets say - 1 second prints the rotation 0,0,0. Any idea how to fix this? I want the character to rotate to the player start's rotation

meager spade Sep 29, 2018, 9:38 PM

#

does CopyProperties still have the BlueprintReadWrite issue?

#

iirc it wouldn't copy BRW but only BR properties

thin stratus Sep 29, 2018, 9:39 PM

#

@meager spade Well I'm only talking BPs right now.
The event is just a Implementable event forwarded iirc.

#

I exposed it but can't remember what I did exactly.

meager spade Sep 29, 2018, 9:40 PM

#

ok

thin stratus Sep 29, 2018, 9:40 PM

#

@nocturne berry Sounds like an Actor vs Control Rotation

#

Try to set the Control Rotation too

severe widget Sep 29, 2018, 9:40 PM

#

Oh you exposed that?

#

Seemed to be a pretty good change

thin stratus Sep 29, 2018, 9:42 PM

#

Yeah can't remember when, but PR that in cause I needed that for future BP Client projects.

severe widget Sep 29, 2018, 9:43 PM

#

That's one way around the adamant bp only crowd :P

thin stratus Sep 29, 2018, 9:45 PM

#

I still think there is A LOT more that could easily be exposed.
Thinks like the AI Controller bWantsPlayerState boolean

#

I get that a lot of games have AI that doesn't need to have a PlayerState

#

But if you want to fill up slots in a game like UT (or any other game where you have teams etc.)
you kinda need that boolean, so that your AI can also have stats properly

meager spade Sep 29, 2018, 9:46 PM

#

my AI uses PlayerStates, but thats because the AI are basically players

#

they keep scores and damage dealt etc

opaque flicker Sep 29, 2018, 9:47 PM

#

@thin stratus hey, it's actually the same PlayerState blueprint for both maps how do i do that ?

thin stratus Sep 29, 2018, 9:47 PM

#

I doesn't even need to be the same BP

meager spade Sep 29, 2018, 9:47 PM

#

copy properties with seamless traveln enabled

thin stratus Sep 29, 2018, 9:47 PM

#

But yeah I already said how to do it

#

GameMode - Class Defaults - Enable SeamlessTravel
PlayerState - EventGraph - Add "CopyProperties" Event
2.1. Get Data from old State and set the Variables of the new State with that

#

However be aware that "SeamlessTravel" will cause other events not to call anymore

#

Such as PostLogin won't call on ServerTravels anymore then

#

Cause PostLogin is only for hardtravels

#

You'd need to replace that (if you use it) with similar events, such as HandleStartingNewPlayer

#

Or whatever you can find

opaque flicker Sep 29, 2018, 9:49 PM

#

hmmm thank you alot for helping 😃

nocturne berry Sep 29, 2018, 10:03 PM

#

@thin stratus yes u were right, i've set the control rotation to the actor rotation and that worked. thank you!

north trout Sep 29, 2018, 11:37 PM

#

GameInstance only gets destroyed when you shut down the game right?

fossil spoke Sep 29, 2018, 11:49 PM

#

Yes, you can think of it almost as the games Process in Windows

#

@north trout

north trout Sep 29, 2018, 11:50 PM

#

ok what i dont get is why does Get Player Id changes in PIE? probably wont using steam but still

#

i thought thats supposed to be unique 😦 when i switch gamemode it changes

#

i want to save the players character using his ID so then i dont have to use names since their could be multiple players with the same name in the lobby

fossil spoke Sep 29, 2018, 11:53 PM

#

Player ID is unique to that session.

north trout Sep 29, 2018, 11:54 PM

#

ah shit i dont use seamless travel

fossil spoke Sep 29, 2018, 11:54 PM

#

You can override the function CopyProperties to help with "saving" or "transfering" existing variable values across to the new Session

#

On the PlayerState

north trout Sep 29, 2018, 11:54 PM

#

still would be problematic if players crash or restart, right? they would get a new ID

north trout Sep 30, 2018, 12:28 AM

#

btw if somebody wonders. GetPlayerId does not represent the steam id when the module is loaded. Hit me up if you want some c++ code

opaque tinsel Sep 30, 2018, 2:25 AM

#

im curious, would anyone know how to replicate a fx like ghost trail? Currently i have it setup as this

#

📎 00.PNG

#

📎 01.PNG

umbral adder Sep 30, 2018, 3:34 AM

#

how do i make a party system in menu?

#

And how does fortnite do thier party system?

vivid siren Sep 30, 2018, 3:45 AM

#

Sorry to interrupt, but is this correct procedure to do something for multiplayer? I've been making this chain of events for everything I need to replicate and seems very tedious and hacky. It works, but I feel like there's a better way:

📎 unknown.png

copper portal Sep 30, 2018, 4:23 AM

#

hi when I do destroy actor in a multiplayer game, what gets destroyed?

winged badger Sep 30, 2018, 7:19 AM

#

@regal storm setting the variable on server is sufficient

#

(since it is replicated in your example)

vivid siren Sep 30, 2018, 7:34 AM

#

Very true, I didn't know I could skip the multicast when it comes to variables, thanks! @winged badger

somber oxide Sep 30, 2018, 7:48 AM

#

@copper portal When u do Destroy Actor on Server, Both side got destroyed if it's Replicated Actor.
If you Want to Force Destroy what's Not Replicated but NetLoadOnClient(AKA::Placed In World on Editor) stuff. U have to go C++ to Force Destroy on Client as well

📎 unknown.png

#

@umbral adder Party form comes in Many Forms and shapes on doing it.(I am only capable of sharing the Limited Knowledge I have)

You can always creates a session and Add your friends in Then pull all the people in your session to the real game.
U can make a sessionless Lobby by holding them on Backend. Then only pull everyone according to your MatchMaking Beacon.

#

@opaque tinsel Normally FX is done Locally. But if you are force To Do FX through Networking, you can always Multicast it but make sure that it's not Reliable.

thin stratus Sep 30, 2018, 8:44 AM

#

@north trout The Event "OverrideWith" in PlayerState is for retrieving data from an Idling PlayerState

#

Inactive PlayerStates are created for Players that leave and maybe reconnect

#

So when they crash for example

#

And yes, the PlayerID that you can grab in Blueprints changes.
You need an actually UniqueNetID (think that requires small amount of C++ to expose) to have a proper unique ID

#

And not sure if that works in SubsystemNull

#

@umbral adder It's done via Beacons. A Beacon allows you to hold a connection (which even allows RPCs), without joining the Hosts world.
For Steam you can use the Party Session to Create a Beacon and let people join/host. This is C++ stuff though.

north trout Sep 30, 2018, 9:36 AM

#

@thin stratus thanks ❤

copper portal Sep 30, 2018, 1:37 PM

#

@somber oxide but does character bp get destroyed or the player state

somber oxide Sep 30, 2018, 1:43 PM

#

@copper portal Depend on what u destroy is what u destroy?

copper portal Sep 30, 2018, 1:50 PM

#

I just do destroy actor inside my character bp

opaque flicker Sep 30, 2018, 2:52 PM

#

where's gameinstance BP exist ?

#

on server or owning client ?

mild hull Sep 30, 2018, 2:54 PM

#

pinned messages has a nice picture with all relevant classes on them

copper portal Sep 30, 2018, 4:47 PM

#

I have a small problem. I have this system in my respawn system that is supposed to add a point to the last player standing but it adds a point to 2/4 people. Also if you score on with the 4th player, the game will add a point for the other half of players. When a person gets destroyed, I set is dead in my player state to true. Then I use this code: https://gyazo.com/f94186d038f6c48bf2f2895031eb6c94 to add the score (where the problem is). And after that I call a respawn event which sets is dead to false. What should I do to solve this problem so that only 1 player gets a point that they won for?

Gyazo

north trout Sep 30, 2018, 5:31 PM

#

does anybody know what this error means?
SetActiveLevelCollection attempted to use an out of date NetDriver: GameNetDriver

severe nymph Sep 30, 2018, 5:48 PM

#

@copper portal why are you adding scores for all players?

copper portal Sep 30, 2018, 5:48 PM

#

im not

severe nymph Sep 30, 2018, 5:48 PM

#

Your logic is loop body

#

Array

#

Of all players

copper portal Sep 30, 2018, 5:49 PM

#

is loops through every player and checks if they are dead. if they aren't it adds 1 point to the last player standing

severe nymph Sep 30, 2018, 5:50 PM

#

Hmm

copper portal Sep 30, 2018, 5:50 PM

#

so it isnt supposed to add the score to every personj

#

but it for some reason adds it to 2 people

#

but not all

#

its an odd problem

severe nymph Sep 30, 2018, 5:51 PM

#

This is happening before your setting the dead var

#

Are you setting the dead var and destroying the player pawn before this logic?

copper portal Sep 30, 2018, 5:51 PM

#

oh yeah

#

ur right

#

hopefully that solves the probl;em

severe nymph Sep 30, 2018, 5:52 PM

#

It will 👍🏼

copper portal Sep 30, 2018, 5:52 PM

#

bet

#

im testing it rn

#

loading...

#

getting all my players to join...

#

hmmm

#

okay

#

it doesnt completly work

#

heres the problem now. It only adds it to the first player

#

when the first player wins

#

when someone else wins, no one gets a point

#

atleast other people arent getting points they shouldnt be getting

#

@severe nymph

#

nvm

#

I just fixed it

#

the branch for is dead had the true part connected to the next part of the code

#

so I just removed that

#

and it works

#

thanks for your help

severe nymph Sep 30, 2018, 6:05 PM

#

No problem

copper portal Sep 30, 2018, 7:04 PM

#

does anyone know how to display a widget for everyone? I am currently looping through the player array from get game state and creating widget that way

thin stratus Sep 30, 2018, 7:09 PM

#

I usually do GetAllActorsOfClass for PlayerControllers and call a ClientRPC on each.
Can also keep a list of PCs managed through PostLogin and Logout

copper portal Sep 30, 2018, 7:26 PM

#

ok I will try that

copper portal Sep 30, 2018, 9:37 PM

#

@thin stratus it doesnt show for anyone

#

the widget

meager spade Sep 30, 2018, 9:54 PM

#

show the code

#

and you are calling the clientrpc from the server and getting the controllers from the server?

copper portal Sep 30, 2018, 9:55 PM

#

oh wait

#

ok so it was my problem

#

I did something wrong with the branch

#

but

#

I have the text binded to a var that doesnt show on other players screen and also only 2 people see it

#

aha

#

now

#

everyone sees it

#

but 3/4 people dont see the text that is binded

meager spade Sep 30, 2018, 9:57 PM

#

how you getting the text?

copper portal Sep 30, 2018, 9:57 PM

#

when I add the score, I get the player's name from a cast to player state: https://gyazo.com/897971749df65ee55d37ece67751f454

Gyazo

#

then in my widget https://gyazo.com/ce8ff45f95c26994a843d3d2a781ea32

Gyazo

meager spade Sep 30, 2018, 9:58 PM

#

you do know normal clients cant access gamemode?

copper portal Sep 30, 2018, 9:58 PM

#

only server?

meager spade Sep 30, 2018, 9:58 PM

#

yes

copper portal Sep 30, 2018, 9:58 PM

#

ah that explains why only host sees it

#

so what should I do?

#

move the variable to playerstate?

meager spade Sep 30, 2018, 9:59 PM

#

store the winner in gamestate

#

or playerstate

copper portal Sep 30, 2018, 9:59 PM

#

ill do game state

#

replicated?

meager spade Sep 30, 2018, 10:00 PM

#

yes

copper portal Sep 30, 2018, 10:01 PM

#

ok im testing it rn

#

it should work

#

wow I didnt connect the cast in the widget bind

#

lol

#

ok it doesnt show the widget for everyone

meager spade Sep 30, 2018, 10:08 PM

#

show your calls for the widget

copper portal Sep 30, 2018, 10:08 PM

#

https://gyazo.com/9aef6decef28121e91b9093466c73472 https://gyazo.com/7db8fe6e4aa6440c1d68d8b095653010

Gyazo

meager spade Sep 30, 2018, 10:10 PM

#

that get all players is ran on the server right?

copper portal Sep 30, 2018, 10:10 PM

#

get all actors is in gamemode

#

so yes

#

the widget shows for only 3/4 players

meager spade Sep 30, 2018, 10:20 PM

#

hnn

copper portal Sep 30, 2018, 10:36 PM

#

what do you think

#

I should do

#

I print string and the get all player controllers does have 4, 1 for each character

#

so thats weird

meager spade Sep 30, 2018, 10:46 PM

#

unless its not reliable

copper portal Sep 30, 2018, 10:46 PM

#

I set it to reliable

#

Ithink

#

yup

#

reliable

meager spade Sep 30, 2018, 10:46 PM

#

and the widget ref is valid on all clients

copper portal Sep 30, 2018, 10:47 PM

#

widget ref is not replicated

#

and I set the ref in begin play of player controller

#

does the ref need to be rep

#

?

meager spade Sep 30, 2018, 10:48 PM

#

no if the client has it set locally

copper portal Sep 30, 2018, 10:49 PM

#

ooo this is something

#

I disconnect from completed to delay and it showed for all 4 people https://gyazo.com/2f5f34ad0b7913648b4ded9d127e0014

Gyazo

#

so the loop is completing too early

#

1 person too early

meager spade Sep 30, 2018, 10:50 PM

#

ok

copper portal Sep 30, 2018, 10:50 PM

#

have u had such a problem before?

meager spade Sep 30, 2018, 10:51 PM

#

no

copper portal Sep 30, 2018, 10:51 PM

#

o wait

#

I think that was a fluke

#

I just tested it again and it showed for 2 people

#

nvm

#

it got 4 again

copper portal Sep 30, 2018, 11:08 PM

#

@meager spade i added this: https://gyazo.com/8f43d63ac5c6c5aa3cf156a01335d189 and it shows for everyone but on the second round it does this: https://gyazo.com/14be4c791149e474f6032ae27f4383fd and the players dont respawn and the widget doesnt disappear. This is my new code in its total: https://gyazo.com/423a8ad72f9498e0dde9b97a9cfb3eb3

winged badger Oct 1, 2018, 12:35 AM

#

do not use ForLoops with Delay

#

they are supposed to execute synchronously

#

use SetTimerByEvent or SetTimerByFunction name

#

keep track of index manually, and invalidate the timer when you're through the array

copper portal Oct 1, 2018, 1:06 AM

#

@winged badger I updated my code: https://gyazo.com/8603cd3dbe50e30f468600adbe9aa061 and now it just repeats the respawn system and breaks the game

Gyazo

copper portal Oct 1, 2018, 1:24 AM

#

but at the start, it shows the widget for everyone

copper portal Oct 1, 2018, 3:41 AM

#

https://gyazo.com/f8b979ab9de262ba4dc758cf3be375ad

Gyazo

▶ Play video

#

works fine then kapow

#

it dies

copper portal Oct 1, 2018, 4:34 AM

#

ok I found out the problem

#

I was putting respawn in the loop lol

vivid siren Oct 1, 2018, 6:15 AM

#

Hey, is it alright to update the player's aim pitch and yaw through a server RPC event on the tick?

fossil spoke Oct 1, 2018, 6:17 AM

#

Yep

vivid siren Oct 1, 2018, 6:28 AM

#

Awesome thanks

cerulean temple Oct 1, 2018, 10:12 AM

#

Hey guys,
I ran into a problem, where I attach a gun to a player, it's rotation is not replicated and while on server everything looks just fine, but on clients it is rotated in a strange way. If anyone had such issue could you please tell me what you did to fix it. Thank you

📎 unknown.png

opaque flicker Oct 1, 2018, 10:50 AM

#

guys how to make seamless travel work in my game ?!

fluid prawn Oct 1, 2018, 11:20 AM

#

this looks like a rust remake in third person for UE4

thin stratus Oct 1, 2018, 11:29 AM

#

@cerulean temple Are you sure you process of attaching is properly replicated?
Also, Fortnite Icons? :D Really?

twin juniper Oct 1, 2018, 11:31 AM

#

Anyone have any idea why the ViewportSize() is returning 0 on the client

#

it works with no dedicated server

#

but with the tick box, it breaks

#

and returns 0

thin stratus Oct 1, 2018, 11:35 AM

#

In Editor?

#

Are you sure this isn't ticking on the DedicatedServer?

#

Cause the DedicatedServer has no visuals

#

So also no Viewport

twin juniper Oct 1, 2018, 12:10 PM

#

I found the issue out.

#

My PlayerController reference was nullptr. When calling PlayerController->GetViewportSize()

twin juniper Oct 1, 2018, 12:27 PM

#

Are AIControllers visible to other players?

#

Can players call methods on them? Or would they need to call a Server RPC to call a method on an AIController?

thin stratus Oct 1, 2018, 12:27 PM

#

AIControllers are ServerOnly

#

They don't exist on Clients

#

ServerRPCs can be used to reach them of course, but you need an owned actor to perform the ServerRPC, as always

north trout Oct 1, 2018, 4:20 PM

#

does steam servertravel have to be seamless?

jolly siren Oct 1, 2018, 4:43 PM

#

@north trout yes, ever since 4.15

warm summit Oct 1, 2018, 5:51 PM

#

Hey Guys, so im making a Steam-integrated Multiplayer game. For the Replications I need proper testing. Until now I always used the In-Engine Multiwindow Preview but I think I need to test it somehow different, because of the Steam IDs and stuff. Any suggestions how I could test my project with 2 different Steam accounts?

thin stratus Oct 1, 2018, 6:13 PM

#

2 PCs. 2 Steam Accounts.

#

Steam only allows one Account and one Game to be run at the same time.

#

Only halfway solution is using a Virtual Machine, but I haven't really had luck with that.

#

@warm summit

warm summit Oct 1, 2018, 6:14 PM

#

ok thanks @thin stratus

trim dirge Oct 1, 2018, 8:22 PM

#

What is the best way to transfer data from one level to another ?

balmy kindle Oct 1, 2018, 8:40 PM

#

store it in the game instance, or make a savegame

thin stratus Oct 1, 2018, 9:36 PM

#

@trim dirge @balmy kindle Depending on the Data you can also use Seamless ServerTravel and move Data between PlayerStates with "CopyProperties" event or PlayerControllers with "OnSwapPlayerControllers (GameMode)" event.

trim dirge Oct 1, 2018, 11:54 PM

#

my question is if u join a session u r considered a client,however the one who create a session is a host
so as a client if u set ur name of class in the lobby they won't be visible to other players
how do you change that? or "Where you store your data"

copper portal Oct 1, 2018, 11:55 PM

#

@thin stratus I did what you said to do for showing a widget to everyone but when I export and test with a friend, no one sees the widget. What should I do?

slender yarrow Oct 2, 2018, 2:07 AM

#

has anyone ever experienced an event networkerror node getting called for no reason when dealing with the steam subsystem? I followed and created that lobby menu project from the UE youtube and got it working perfectly in its own project. The second I migrate it to another project it doesnt work. the LAN option works but when you try to make a Steam lobby "Event NetworkError" gets called

#

this is the menu proj i was referring to https://www.youtube.com/playlist?list=PLZlv_N0_O1gYqSlbGQVKsRg6fpxWndZqZ

YouTube

Blueprint Multiplayer | v4.11 | Unreal Engine - YouTube

Video Tutorial Series In this video series, Wes Bunn from Epic Games walks you through creating a networked game with Steam integration entirely through Blue...

raven rapids Oct 2, 2018, 2:55 AM

#

Is there such a thing as "infinity" net cull distance squared, or do I just use a very high number?

winged badger Oct 2, 2018, 3:05 AM

#

you can override AActor::IsNetRelevantFor

#

AActor::IsWithinNetRelevancyDistance is not virtual

raven rapids Oct 2, 2018, 3:29 AM

#

Unfortunately I'm restricted to blueprints (modding).

fossil spoke Oct 2, 2018, 4:03 AM

#

You mean bAlwaysRelevant?

kindred jungle Oct 2, 2018, 4:13 AM

#

Anyone knows of any good materials about replicating non standard movement?
I have a pawn that has a very complex movement mechanic. Ideally, local client would do all the traces and math to calculate next position while server would just check if that move is valid (cheaper to do). Everybody would just interpolate the pawn from current position to new position.
I tried different approaches but I still get some jitter and it doesn't look very smooth.
In current version I move the pawn locally immediately and everybody just gets new positions and lerps to that.. But it doesn't look good.

copper portal Oct 2, 2018, 4:13 AM

#

I used cedric_eXi advice to show a widget to every player but it doesnt work. I have created 2 custom events that that are reliable and run on owning client and they show the widget and hide the widget. The widget shows when I run locally in ue4 but when I export and play the game through steam, the widget doesnt show. This is what I did: https://gyazo.com/96f5f9ebdba104d37b337d15e38e1b69 and this is how I call it: https://gyazo.com/5c0402571500ed19e4f4491fc42c5ecc

Gyazo

kindred jungle Oct 2, 2018, 4:21 AM

#

Side question... If I play in editor and have multiple clients open.. Can I somehow simulate network latency? Basically give myself a ping of 100ms for example 😃

#

Nvm: found this, for anyone interested: https://www.unrealengine.com/en-US/blog/finding-network-based-exploits

thin stratus Oct 2, 2018, 11:58 AM

#

@copper portal This is probably due to the way you call this

#

Cause this will def call the RPC on each ClientController

#

And since you say you use Steam, are you using Seamless Travel somewhere?

#

Cause that won't call PostLogin

copper portal Oct 2, 2018, 1:48 PM

#

I use server travel @thin stratus

thin stratus Oct 2, 2018, 1:49 PM

#

Yeah but that's a Seamless Travel

#

cause you use Steam

#

And Seamless Travel aren't calling PostLogin

#

So if that code from above is called in PostLogin, it won't work

copper portal Oct 2, 2018, 1:51 PM

#

So I have to call the events on post login?

#

Because I'm not

#

I'm calling it in a custom event that gets called in my character bp

#

I want the widget to show at a certain time not instantly

thin stratus Oct 2, 2018, 2:00 PM

#

Well if it works in PIE but not in Steam/packaged, then I would try to start using some print strings and checking why your event isn't calling

#

I assumed you did that on PostLogin

wise depot Oct 2, 2018, 2:00 PM

#

does anyone know the correct way to get a pointer to the FOnlineSubsystemModule that's in use?

copper portal Oct 2, 2018, 2:00 PM

#

I didnt do anything on post login

thin stratus Oct 2, 2018, 2:00 PM

#

You mean the specific Subsystem, not the Interface? @wise depot

#

Afaik, that's not possible.

wise depot Oct 2, 2018, 2:01 PM

#

nah, there's a class, FOnlineSubsystemModule, that contains DefaultPlatformService, looking for access to that

copper portal Oct 2, 2018, 2:01 PM

#

I have stuff printed too yet it shows in the packaged version but the widget doesn show

thin stratus Oct 2, 2018, 2:02 PM

#

@wise depot Well at that point you only have the "GetOnlineSubsystem" function

#

Which returns the interface

#

@copper portal Then add more print strings and check where the whole chain of calls breaks

wise depot Oct 2, 2018, 2:02 PM

#

what do i need to include to get that function?

#

isn't that the one that requires a subsystem name?

copper portal Oct 2, 2018, 2:03 PM

#

ok I will do that when I am home after school

thin stratus Oct 2, 2018, 2:03 PM

#

Yeah it requires the name @wise depot

wise depot Oct 2, 2018, 2:04 PM

#

ah yeah that's the problem, i'm looking for a way of getting hte default interface's name as specified in the configs

#

the project i'm working on uses multiple online systems, atleast that's the plan, just looking into cleaning up session data now across multiple

thin stratus Oct 2, 2018, 2:04 PM

#

So you just want the config variable name?`

#

Hm

#

Can you even have more than one active?

#

Wasn't that system designed to only have one active at a time

wise depot Oct 2, 2018, 2:05 PM

#

aye, all you need to do is call Online::GetSubsystem(World, Name) to load multiple in

#

it was with UE3, it looks like it was changed up for UE4

thin stratus Oct 2, 2018, 2:05 PM

#

// Load the platform defined "default" online services module
    if (GConfig->GetString(TEXT("OnlineSubsystem"), TEXT("DefaultPlatformService"), InterfaceString, GEngineIni) &&
        InterfaceString.Len() > 0)
    {
        FName InterfaceName = FName(*InterfaceString);
        // A module loaded with its factory method set for creation and a default instance of the online subsystem is required
        if (LoadSubsystemModule(InterfaceString) &&
            OnlineFactories.Contains(InterfaceName) &&
            GetOnlineSubsystem(InterfaceName) != NULL)
        {
            DefaultPlatformService = InterfaceName;
        }

#

Well that's how they get the Default one to load

#

That's line 85 and ongoing, function void FOnlineSubsystemModule::LoadDefaultSubsystem()

wise depot Oct 2, 2018, 2:06 PM

#

atleast that's what this guy says:
https://forums.unrealengine.com/unreal-engine/marketplace/64606-social-network-plugin-facebook?92912-Social-Network-Plugin-(Facebook)=&viewfull=1

Unreal Engine Forums

All Things Related to the Unreal Engine Marketplace. Discuss Marketplace Offerings, Request New Content, Promote Your Work.

#

not using that plugin, just pointing out the comment that its doable to have more than one

#

i'll just use the gconfig line i guess

#

see the end plan is, cross play using the Null system for servers and default system for platforms for p2p

opaque flicker Oct 2, 2018, 4:22 PM

#

Only Local Player Controllers can be assigned to widgets. LobbyPC_C_1 is not a Local Player Controller.

📎 widgetpostlogin.png

#

i'm using listen server and client

#

what's the problem then ?

thin stratus Oct 2, 2018, 4:25 PM

#

That you are assigning non-local player controllers

#

PostLogin calls on the Server

#

The first PlayerController you get is from the ListenHost, which is Local to the Server.

#

The second one is from the Client, which is not local from that perspective

#

So the second one causes your error

#

You need to call a ClientRPC on the PlayerController and create teh widget in that

#

Or just use BeginPlay in the PlayerController and filter with "isLocalPlayerController"

#

@opaque flicker

opaque flicker Oct 2, 2018, 4:28 PM

#

i have another question reharding this issue, how to make the server set the client data like his name so it can be replicated

#

i tried to use repnotify and serverRPC but whatever what the client still only sets on client even if i use serverRPC

#

PostLogIn on gamemode calls player controller clientRPC

📎 widget2.png

#

client RPC

📎 widget3.png

#

still shows only on the host player and doesn't show in the client

winged badger Oct 2, 2018, 5:07 PM

#

RPC might land before the PC replicates

#

probably does

#

it doesn't wait for NetUpdate

#

putting that in BeginPlay on your AHUD derived class will be fine though

#

its what its for

opaque flicker Oct 2, 2018, 6:18 PM

#

it's main menu widget

#

i mean lobby widget

winged badger Oct 2, 2018, 6:35 PM

#

doesn't really matter what it is

#

if a PC can make it, HUD can make it just the same

#

only difference is, its the HUDs purpose to do so

opaque flicker Oct 2, 2018, 9:50 PM

#

quick question, can normal functions that u create in the BP access server or has authority ?

opaque flicker Oct 2, 2018, 10:48 PM

#

can i make this function say hello world as a SERVER, without calling it in (RunOnServer) Event?

📎 function.png

sharp pagoda Oct 2, 2018, 11:23 PM

#

@opaque flicker Of course, RPCs (like RunOnServer events) are used to change the context of where the code is running. For example if you're a client without authority and want to change your context to have authority you need to use a server RPC to tell the server to run that block of code. If the server initiates the code in the beginning, then it will run as the authority.

potent prairie Oct 2, 2018, 11:28 PM

#

Got this issue during multiplayer where Hit Results are only detected while I'm moving and using my weapon. If I stand still, the LineTrace still works, but the Hit Result doesn't detect any hit actors lol. No idea why it works while moving but not standing still :/

#

Works fine if I host the server though

sharp pagoda Oct 2, 2018, 11:29 PM

#

I'm guessing you're using OnRep for a hit result?

potent prairie Oct 2, 2018, 11:29 PM

#

no

#

multiline trace and then getting a Hit Result from a loop

sharp pagoda Oct 2, 2018, 11:29 PM

#

So the trace is just not returning any hit actors if you don't have a velocity?

#

Show me your implementation

potent prairie Oct 2, 2018, 11:30 PM

#

📎 Capture.PNG

#

it detects hits fine if i host the server, but anyone joining/clients its very inconsistent

#

or if i test as ded server its bad too

sharp pagoda Oct 2, 2018, 11:31 PM

#

Enable debug draw and see if the traces are firing off properly

potent prairie Oct 2, 2018, 11:31 PM

#

yeah they are it gets that green line

#

100% of the time

#

thats mainly why im so confused

#

cause the hit actor isnt being detected

#

but if i'm moving and swinging around, it starts to detect it better. not 100% but not 0% like if im standing still

#

but if i'm the host, it detects 100% of the time regardless

sharp pagoda Oct 2, 2018, 11:33 PM

#

Where is it failing? Are you at least seeing all the display names being printed or does that come up empty when it shouldn't?

potent prairie Oct 2, 2018, 11:34 PM

#

yeah it comes up empty, that print string just doesn't display any hit actors. When it hits an actor, it fires correctly and says the name of the actor

#

but yeah sometimes it fires lol

sharp pagoda Oct 2, 2018, 11:35 PM

#

Add some debug messages to the false of can hit actor

potent prairie Oct 2, 2018, 11:35 PM

#

its very inconsistent which is why i dont get it

sharp pagoda Oct 2, 2018, 11:35 PM

#

There must be something strange in there you're doing

twin juniper Oct 2, 2018, 11:35 PM

#

do you guys have any recommended reading for mp and networking?

potent prairie Oct 2, 2018, 11:36 PM

#

i guess but I can't see where its breaking

#

if it wasnt inconsistent and just didnt work 0% of the time, it would make sense

#

but it works like 20-30% of the time

sharp pagoda Oct 2, 2018, 11:36 PM

#

Can I see your implementation of canhitactor?

potent prairie Oct 2, 2018, 11:36 PM

#

sure

sharp pagoda Oct 2, 2018, 11:37 PM

#

@twin juniper http://cedric-neukirchen.net/2017/02/14/multiplayer-network-compendium/

Cedric Neukirchen

eXi

Multiplayer Network Compendium

potent prairie Oct 2, 2018, 11:37 PM

#

📎 Capture.PNG

#

hard to read lol probably an error in there

sharp pagoda Oct 2, 2018, 11:37 PM

#

That's all local, so it shouldn't affect whether you're server or not 🤔

twin juniper Oct 2, 2018, 11:38 PM

#

thankd @sharp pagoda

sharp pagoda Oct 2, 2018, 11:38 PM

#

I'm not sure, but try printing something if that returns false

potent prairie Oct 2, 2018, 11:38 PM

#

okay ill work around a bit

copper portal Oct 2, 2018, 11:46 PM

#

@thin stratus nothing is not printing

vital steeple Oct 3, 2018, 7:38 AM

#

I just moved to 4.20 and my dedicated server pops tons of umg related errors then crashes. It was fine in 4.18. anyone else run into this?

copper portal Oct 3, 2018, 1:51 PM

#

Go back to 4.18

timid pendant Oct 3, 2018, 2:29 PM

#

Hello is it possible to use switches to join a dedicated server from the game executable

sharp pagoda Oct 3, 2018, 2:30 PM

#

"switches" ?

#

And yes you can join a dedicated server just like any other server, through a join session call

copper portal Oct 3, 2018, 3:00 PM

#

@thin stratus I did what you said to add more print strings and everything prints but still, players can't see the widget.

thin stratus Oct 3, 2018, 3:01 PM

#

Any warnings or errors in the log or when packaging?

wise depot Oct 3, 2018, 4:01 PM

#

hey guys, does anyone know how to create session search results?

I'm using the null system for our dedicated server and using "open IP" does fill in session information, i have another service that i can dump information on from the server and the client can request information from so if i can construct the search result data i can dump that on the middle service

#

I can't include OnlineSubsystemNullTypes.h though so it looks like i can't just construct the search result manually and upload the whole result

#

or if someone knows some other way i can fill in session data once connected via "open" command

#

it sure would be great if epic released information on how they got cross play working with fornite with UE4

sharp pagoda Oct 3, 2018, 4:08 PM

#

They use their own subsystem

wise depot Oct 3, 2018, 4:09 PM

#

yeah, but it would be nice if they shared that

#

to see how things are done

sharp pagoda Oct 3, 2018, 4:10 PM

#

Pretty sure it's going to be made available to all at some point, it's closed to epic only right now since they're not ready to go public with it.

wise depot Oct 3, 2018, 4:10 PM

#

is there any public information on this at all or it is just rumors about making it public?

sharp pagoda Oct 3, 2018, 4:11 PM

#

Crzyhomer (a networking dev for epic) said this in 2014: "The short answer is that this is not ready for public consumption. That module is meant for some current internal initiatives and was not written with "cross platform" online services in mind."

#

That's the only statement I've seen from epic themselves though

wise depot Oct 3, 2018, 4:13 PM

#

only thing i can see that relating to is someone asking about friends and chat interfaces

#

https://answers.unrealengine.com/questions/64991/slatesteam-how-do-i-use-sfriendslist-and-the-frien.html

sharp pagoda Oct 3, 2018, 4:14 PM

#

Yea, rama was trying to use mcp's friend module and got that response.

wise depot Oct 3, 2018, 4:15 PM

#

mcp?

severe widget Oct 3, 2018, 4:16 PM

#

that's epic's subsystem/backend IIRC

sharp pagoda Oct 3, 2018, 4:17 PM

#

Surprised they didn't go public with it since it has held up so well through fortnite

#

Wonder what they're waiting for

wise depot Oct 3, 2018, 4:20 PM

#

yeah its a bit ridiculous how little information there is about cross-play with UE4

sharp pagoda Oct 3, 2018, 4:21 PM

#

Few choose to take that scary path. Rocket league is the only one that comes to mind

#

So uncommon since you have to write your own subsystem backend

wise depot Oct 3, 2018, 4:21 PM

#

why though?

#

is the thing i don't get

sharp pagoda Oct 3, 2018, 4:22 PM

#

Because there's no universal subsystem available

wise depot Oct 3, 2018, 4:22 PM

#

well the Null one will work just for the basic functionality

#

but what i mean is i don't get why epic haven't released the things they've done for it

sharp pagoda Oct 3, 2018, 4:23 PM

#

I'm guessing not many people have the need? Supply and demand :p

wise depot Oct 3, 2018, 4:24 PM

#

if they did suddenly drop it though the demand would increase, the lack of demand is probably because every forum post and answer hub post asking about how to do cross play is left unanswered

#

there is obviously a demand out there, i imagine most developers making titles across multiple platforms would prefer them to be able to play together

#

making multiplayer games*

sharp pagoda Oct 3, 2018, 4:26 PM

#

In a perfect world we wouldn't have like 5 different subsystems

wise depot Oct 3, 2018, 4:29 PM

#

also zero documentation around for even getting started creating a custom online subsystem

sharp pagoda Oct 3, 2018, 4:30 PM

#

There's an open source subsystem built for ranked FPS games you might be interested in, I'll find it hang on

wise depot Oct 3, 2018, 4:30 PM

#

that would be great

sharp pagoda Oct 3, 2018, 4:31 PM

#

Getting it to be friendly with xbox/playstation/etc. is the real challenge in this, you have to be pretty fluent in all of the subsystems at once

#

Which means basically reading books worth of docs

wise depot Oct 3, 2018, 4:32 PM

#

where there's a will there's a way!

sharp pagoda Oct 3, 2018, 4:32 PM

#

https://github.com/uetopia/uetopia-online-subsystem

GitHub

uetopia/uetopia-online-subsystem

Online Subsystem plugin for Unreal Engine 4. Contribute to uetopia/uetopia-online-subsystem development by creating an account on GitHub.

#

That's it

#

Master branch is empty no idea why, go to the marketplace branch for a stable build

vital steeple Oct 3, 2018, 5:22 PM

#

@thin stratus me? no, no packaging warnings or errors regarding that. though i have 2 packaging warnings about materials not being sm4 compatible. i think thats unrelated though. 😃

thin stratus Oct 3, 2018, 5:26 PM

#

:P No, not you. But well

vital steeple Oct 3, 2018, 5:39 PM

#

lol 😃

sharp pagoda Oct 3, 2018, 6:29 PM

#

?

#

I was just linking the guy to the source code, I wasn't seeking help

#

I don't think he planned on using it, just wanted to read it

subtle nymph Oct 3, 2018, 8:49 PM

#

i'm having trouble getting the default first person projectile to replicate across clients

#

and i'm unsure where to start providing info, so please ask questions

#

i do have the "replicates" box checked

copper portal Oct 3, 2018, 8:56 PM

#

@thin stratus no

#

It compiles completely fine

winged badger Oct 3, 2018, 9:08 PM

#

@subtle nymph first step is making sure it doesn't replicate at all

#

and its not just the mesh not being replicated

#

if it doesn't, then whats the difference when listen server host fires or when a client fires?

#

if client can see server's projectiles but not the other way around, you're spawning them only locally on client

subtle nymph Oct 3, 2018, 9:10 PM

#

neither viewing window can see the other's projectiles

#

so client and server cannot see the other's projectiles

winged badger Oct 3, 2018, 9:10 PM

#

and those are? server + client or 2 clients?

subtle nymph Oct 3, 2018, 9:11 PM

#

oh

#

2 clients

#

i have dedicated server checked

winged badger Oct 3, 2018, 9:11 PM

#

sometimes its easier to debug without it

#

as you can see the server's perspective

subtle nymph Oct 3, 2018, 9:11 PM

#

okay

winged badger Oct 3, 2018, 9:11 PM

#

(what's really going on)

subtle nymph Oct 3, 2018, 9:13 PM

#

ah, ok

#

server side replicates

#

client does not

winged badger Oct 3, 2018, 9:13 PM

#

then client is shooting only locally

#

which means you should make a ServerFire (Server, Reliable) RPC

#

and execute the firing logic there

subtle nymph Oct 3, 2018, 9:18 PM

#

could you help with that too? i'm new to ue4

#

~~i had to look up what an rpc was~~

winged badger Oct 3, 2018, 9:19 PM

#

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

Cedric Neukirchen

eXi

Multiplayer Network Compendium

#

strongly recommend giving that a read

subtle nymph Oct 3, 2018, 9:19 PM

#

okay, will do

winged badger Oct 3, 2018, 9:20 PM

#

people who don't usually end up hitting the wall trying to get the basics to work for weeks

subtle nymph Oct 3, 2018, 9:22 PM

#

thanks for all your help

copper portal Oct 3, 2018, 10:48 PM

#

I dont know if you guys can help but I used all of @thin stratus advice for showing a widget for everyone which didnt work. I then used more of his advice of printing more strings which they all printed. I made 2 run on owning client rpcs that get called in an event which gets called in my character bp. The widget shows for some of the players when I run 4 standalones, not all 4/4 people can see the widget. But when I package the game and test with my friends using steam (I have setup a steam game key and steam multiplayer so people can test through steam), no one sees the widget, yet all the strings get printed. If you have any idea on what I can do to solve this problem, please @ me.

meager spade Oct 3, 2018, 11:45 PM

#

@copper portal what have you got so far

copper portal Oct 3, 2018, 11:49 PM

#

@meager spade https://gyazo.com/8ea196f6b151c3f2e50d5ddfe5da080a https://gyazo.com/cc1974d9ba7ff069561b81c12c856c42

Gyazo

copper portal Oct 4, 2018, 12:22 AM

#

@meager spade a quick side question, is it possible to use a gif in ue4 to say set it as an image using the image component in a widget?

knotty frost Oct 4, 2018, 1:07 AM

#

has anyone else ran into an issue where movement modes are not replicating or updating for simulated characters on dedicated servers in 4.20.3? only really related thing ive found is https://issues.unrealengine.com/issue/UE-62345

wary wyvern Oct 4, 2018, 10:10 AM

#

Hey guys, how to destroy a level actor on client side only?

scenic tangle Oct 4, 2018, 10:26 AM

#

does anyone use this plugin with 4.20? https://github.com/yas-online/UE4-DedicatedServer

GitHub

yas-online/UE4-DedicatedServer

A UE4 plugin which adds proper console support (input) and RCon - yas-online/UE4-DedicatedServer

bitter lintel Oct 4, 2018, 11:37 AM

#

Syncing 16 spheres rolling at 4 NetFrequencyUpdate. It's very jumpy, is this normal? Just blank Rolling ball project.

thin stratus Oct 4, 2018, 11:44 AM

#

Well default stuff has not interpolation etc.

#

At a ping of 0ms it should all be fine

#

Higher pings will make it more and more jumpy

bitter lintel Oct 4, 2018, 11:44 AM

#

Thanks! It's default same computer PIE stuff though.

#

Would think it would be less jumpy. Most people just make their own interpolation solution?

thin stratus Oct 4, 2018, 11:45 AM

#

Even that has a ping. Was NetFrequencyUpdate better on higher or lower numbers?

#

Well, the CMC for Characters is the only component that interpolates

bitter lintel Oct 4, 2018, 11:45 AM

#

Smoother at higher numbers.

thin stratus Oct 4, 2018, 11:45 AM

#

If you just use bReplicateMovement, all it does it tell the Client the new Location and that one sets it

#

Without any interpolation

#

If the update is from 5 seconds ago, it just jumps to the new location

knotty frost Oct 4, 2018, 11:46 AM

#

so it looks like ClientAuthorativePosition being true breaks GetVelocity in 4.20

bitter lintel Oct 4, 2018, 11:46 AM

#

Ok, sweet, thanks!

open cape Oct 4, 2018, 3:08 PM

#

hey guys, is there some way to run a different level on the dedicated server and clients when using PIE? i want to test ClientTravel from the Main Menu level to a level on the dedicated server without having to build the game every time.

slate veldt Oct 4, 2018, 3:51 PM

#

Hey all, I've got a fairly complex networking question for you all:
Our game is current using a get around connection method. It's based around shooter game, but for some reason the client cannot connect to the host unless the host first types in "open LevelURL?game=gamemode?listen"

Going further into it, it appears that when we host normally (using our shootergame based networking logic) the UPendingNetGame never receives a welcome message (or any kind of message for that matter) in the NotifyControlMessage function.
When we run the console command on the host and then try joining via client, we can see it run through as expected, receiving the welcome message as expected during that function.

Does anyone know why this would occur?

rose egret Oct 4, 2018, 4:00 PM

#

Do RPCs use NetworkRelevancy?

subtle peak Oct 4, 2018, 4:14 PM

#

Does anyone here have any good tutorials or resources for fog of war in BP? That works in multiplayer?

rose egret Oct 4, 2018, 4:20 PM

#

@subtle peak un-cheatable fog of war ? normal fog of war could be done by replication. just replicate the cell states

subtle peak Oct 4, 2018, 4:22 PM

#

@rose egret Well I have no clue where to start if I were to make Fog of War. I'm wondering of anyone has found any good tutorials on it. I've not found any good ones that does not require C++.

chrome bay Oct 4, 2018, 5:47 PM

#

@rose egret Net Relevancy only affects multicast RPC's of course - I believe they bypass relevancy, but I also believe that was a bug that may have since been fixed.

#

Obviously, don't use multicast RPC's to set persistent states etc, otherwise if that get's fixed then changes won't propagate when actors come back into range etc.

manic pine Oct 4, 2018, 5:48 PM

#

think it was fixed with 4.20

chrome bay Oct 4, 2018, 5:48 PM

#

Ah yeah, there ya go then. I remember seeing a talk on some optimization stuff that one of the MS studios did and they brought that up

#

Dreadnought I believe

graceful cave Oct 4, 2018, 6:46 PM

#

does anyone know how the NetPktLag command works?

#

in some cases it seems like its only outbound

#

on some functions it seems like its also inbound

#

for example, while simulating 300 ping, other characters' movements are still only delayed by their ping

#

despite viewing it from the high ping client

#

but if the server calls LaunchCharacter on a high ping client, there is a delay before they receive it and then theyre abruptly corrected to their new location

#

when i run this:

📎 unknown.png

#

with NetPktLag=100

#

📎 2018-10-04_14_53_06-NetTest_Game_Preview_Client_1_64-bit_PCD3D_SM5.png

#

i get that

#

and that is the reported ping in the player state as well

#

so is ping in UE4 equal to RTT? or does it only simulate outbound?

manic pine Oct 4, 2018, 6:55 PM

#

each client has their own ping even in pie

graceful cave Oct 4, 2018, 6:56 PM

#

right

#

but im talking about inbound from the server

sharp pagoda Oct 4, 2018, 6:56 PM

#

Ping is RTT yes

graceful cave Oct 4, 2018, 6:56 PM

#

because that exists with real networking

#

ok good

#

id hope thats the case here

#

but some things seem a little off

#

like high ping client not seeing movements delayed of characters on a low ping client

#

at least in editor

manic pine Oct 4, 2018, 6:57 PM

#

he should see ping/2 delay

#

that is, highping/2

#

lowping/2

graceful cave Oct 4, 2018, 6:57 PM

#

right but thats not what im seeing

#

and if the other guy is the server and not just a client, theres 0 delay

manic pine Oct 4, 2018, 6:58 PM

#

hmm im pretty sure its working

sharp pagoda Oct 4, 2018, 6:58 PM

#

0 second delay for client observing server player, while the client has simulated lag?

graceful cave Oct 4, 2018, 6:58 PM

#

yes

sharp pagoda Oct 4, 2018, 6:58 PM

#

That's expected

#

Net latency is only outbound

#

Doesn't simulate inbound

graceful cave Oct 4, 2018, 6:59 PM

#

but in a packaged game youre saying ping is RTT?

sharp pagoda Oct 4, 2018, 6:59 PM

#

Yes

graceful cave Oct 4, 2018, 6:59 PM

#

ok hopefully thats the case

#

im about to test it

sharp pagoda Oct 4, 2018, 6:59 PM

#

Nothing's stopping you from testing with a packaged game + icmp :p

graceful cave Oct 4, 2018, 7:00 PM

#

i just packaged the project with that BP i just posted and im gonna upload it to my server to make sure

#

the reason it concerns me is because i made a whole ping compensation system for projectiles where it spawns the projectile ahead of where it normally spawns

#

if their ping is within the allowed compensated amount

#

and while it waits, it spawns a dummy clientside for show

#

everything lines up perfectly in editor

sharp pagoda Oct 4, 2018, 7:01 PM

#

Don't use timestamps for measuring ping, I've done that in the past and ran into lots of time sync issues

graceful cave Oct 4, 2018, 7:02 PM

#

sync between client and server?

sharp pagoda Oct 4, 2018, 7:02 PM

#

Yea

#

Physical computer times

graceful cave Oct 4, 2018, 7:03 PM

#

well its just on the client in my case

#

client gets time before sending and after receiving

winter plover Oct 4, 2018, 7:21 PM

#

hey, so I got a bit of a tricky problem

#

I have a system in place, which has some items players can pick up take form on characters as meshes, such as clothing and picked up weapons

#

now I faced the problem that when a new player would join in, that I would have to re-attach all those

#

but I have items and their mesh representations in different actors

#

and when I try to check either actor at beginplay, it appears that the other might not be replicated yet

#

is there a better place than BeginPlay to do these checks, when all actors have fully replicated?

#

or will I likely have to re-do the way I handle these things?

thin stratus Oct 4, 2018, 7:24 PM

#

What exactly are you trying to achieve?

#

The Attaching?

winter plover Oct 4, 2018, 7:24 PM

#

yea

thin stratus Oct 4, 2018, 7:24 PM

#

Usually you use OnRep variables for events that LateJoiners have to care about

#

Are all these items Actors?

#

Or are they only used as meshes once picked up?

winter plover Oct 4, 2018, 7:25 PM

#

the items themselves are actors, but their physical manifestations are different ones

thin stratus Oct 4, 2018, 7:25 PM

#

So you use one base actor with different meshes you assign?

winter plover Oct 4, 2018, 7:25 PM

#

yea basically

thin stratus Oct 4, 2018, 7:26 PM

#

And if you CharacterA picks up a Backpack, it attaches the whole actor to the player?

winter plover Oct 4, 2018, 7:26 PM

#

the abstract item actor gets added to an inventory, the static mesh gets newly spawned and attached

thin stratus Oct 4, 2018, 7:26 PM

#

Right, then make the newly spawn Mesh a RepNotify variable

#

And in the RepNotify function you attach

#

Are youa ctively creating the StaticMeshComponent?

#

Or just setting the StaticMesh?

winter plover Oct 4, 2018, 7:27 PM

#

It's subclassed from staticmeshactor

#

so I just set it

thin stratus Oct 4, 2018, 7:27 PM

#

So the StaticMeshActor already exists?

winter plover Oct 4, 2018, 7:27 PM

#

yea

thin stratus Oct 4, 2018, 7:27 PM

#

It's important to know what is going on so I can tell you what to do :D

winter plover Oct 4, 2018, 7:28 PM

#

ye sure, ask away :v

thin stratus Oct 4, 2018, 7:28 PM

#

Right, so you have AYourCharacter AYourItem and AYourStaticMeshComp

winter plover Oct 4, 2018, 7:28 PM

#

yea

thin stratus Oct 4, 2018, 7:28 PM

#

Where AYourCharacter has an AYourStaticMeshComp already attached to the back when being spawned, but no Mesh set.

#

And when picking up AYourItem you take the data from it and set the mesh on AYourStaticMeshComp?

winter plover Oct 4, 2018, 7:29 PM

#

not quite

#

when AYourCharacter picks up AYourItem, a new AYourStaticMeshActor gets spawned, whose staticmesh gets set by the data from AYourItem

#

and then Attached to AYourCharacter

#

AYourStaticMeshActor and AYourItem get pointers to each other

thin stratus Oct 4, 2018, 7:30 PM

#

Is your System so dynamic that you can't have the StaticMeshComponents already attached at the start?

winter plover Oct 4, 2018, 7:30 PM

#

yea

#

well actually

thin stratus Oct 4, 2018, 7:30 PM

#

Alright, are these StaticMeshComps set to replicate?

winter plover Oct 4, 2018, 7:30 PM

#

maybe I could get away with just an already attached one

thin stratus Oct 4, 2018, 7:30 PM

#

Well if you know you have 10 different slots on your Character

#

Such as Chest, Back, Legs, etc.

#

Then it makes no sense to not just add these right at the start

winter plover Oct 4, 2018, 7:31 PM

#

I actually do that for most other items, EXCEPT the hat and weapons

#

those can be taken away by other players

thin stratus Oct 4, 2018, 7:31 PM

#

In either case, how are you currently telling everything about the newly attached item?

winter plover Oct 4, 2018, 7:31 PM

#

and is why I had them be separate actors

#

actually lemme check

#

just to be sure

#

after the pointer to the item gets replicated, a func is called that updates the mesh

thin stratus Oct 4, 2018, 7:33 PM

#

Can you show me that

#

Cause technically you only need to make sure that you aren't using an RPC

#

Because Replicated Actors get replicated for new Players anyway

winter plover Oct 4, 2018, 7:33 PM

#

oops wait

#

wrong class

#

it's a NMC RPC

#

for some reason I did it different for that one

thin stratus Oct 4, 2018, 7:33 PM

#

Yeah so you need to replace these

#

RPCs are fire and forget in the sense that anyone who wasn't there when they were called won't receive them anymore

#

That's not only a problem for new player

winter plover Oct 4, 2018, 7:34 PM

#

yea makes sense

thin stratus Oct 4, 2018, 7:34 PM

#

but also for players that are just out of range

#

Your test levels are probably small enough so you didn't notice yet

winter plover Oct 4, 2018, 7:34 PM

#

yea

thin stratus Oct 4, 2018, 7:34 PM

#

If you have something that needs to be replicated to new players or players that get relevant you should use a RepNotify variable

#

I'm not 100% sure how you set the data yet

#

But as an example:

Let's say your Character has a StaticMeshComp

#

Just a plain simple one

#

Attach to its back

#

Now you pick up an item that has a MeshVariable filled

#

The Server does the picking up of course, cause no cheating allowed

#

Now instead of Multicasting the Mesh to everyone

#

You set a RepNotify Mesh Variables

#

And in the RepNotify function you assign the mesh

#

That way late joiners will get the replicated mesh variable

winter plover Oct 4, 2018, 7:36 PM

#

yea I did that for my standalone item representing actors

thin stratus Oct 4, 2018, 7:36 PM

#

and the repnotify functio ncalls

winter plover Oct 4, 2018, 7:36 PM

#

and those work just fine

#

for some reason I didnt for this one

thin stratus Oct 4, 2018, 7:36 PM

#

(: Then you should know now what to do right?

winter plover Oct 4, 2018, 7:36 PM

#

yup

thin stratus Oct 4, 2018, 7:36 PM

#

Cheers

winter plover Oct 4, 2018, 7:36 PM

#

cheers for the pointers

#

and your networking guide aswell

#

helped me alot so far

thin stratus Oct 4, 2018, 7:37 PM

#

(: Glad it helps

velvet fox Oct 5, 2018, 2:04 AM

#

has anyone made an local multiplayer widget?

#

What I'm trying to do is make a character select for a fighting game.

sharp pagoda Oct 5, 2018, 2:46 AM

#

Double posting + question makes no sense, all widgets are local :p

copper portal Oct 5, 2018, 3:16 AM

#

how can I make a shared camera for my paper2d camera?

twin juniper Oct 5, 2018, 9:05 AM

#

@gleaming vector You said a while ago

which is the p2p sockets
you can just use the built in unreal networking
and not worry about that

#

What do you mean?

gleaming vector Oct 5, 2018, 9:05 AM

#

do you know how the unreal networking stack works at a high level?

twin juniper Oct 5, 2018, 9:06 AM

#

Possibly? I don't know if I'm understanding the question

gleaming vector Oct 5, 2018, 9:06 AM

#

like, you know what actor channels are and netdrivers yes?

twin juniper Oct 5, 2018, 9:08 AM

#

Not really yet. Very low knowledge. Best I've done is client-server networking in BP.
Only thing I know about netdrivers is looking into the UWorks plugin a little.
But this is helpful. I had no idea where to start.

gleaming vector Oct 5, 2018, 9:08 AM

#

ok

#

yeah, well, NetDriver is the high level class for organizing how packets are created and sent to remotes

#

they make use of a NetConnection object, which actually does the transmission

#

through sockets

#

er, kinda the other way around

#

regardless, the sockets are implemented in an abstract way

#

you have IPNetSockets which use the system's sockets

#

but then in the case of Steam, you have the SteamNetSockets

#

which make use of steam's p2p networking lib

#

Epic implemented sockets that make use of it

#

so if you activate the steam online subsystem, one of the things it does is makes the Engine use Steam's network sockets

#

rather than the system ones

#

however, even though you are using the p2p netsockets, you cannot make a p2p game in Unreal Engine

#

at it's core, Unreal uses a Server/Client model

#

you can't change that without a lot of effort on your part

#

Steam's sockets are really useful because they route differently and do NAT punchthrough and all those fun things you need to have a well working networking game

#

you just... have to use steam

twin juniper Oct 5, 2018, 9:13 AM

#

That's what I'm seeing as trying to attempt it.
It's a casual VR game so I'm not too worried about cheaters atm (but we are making ways of detecting...etc..)
Client server would obviously be better for scripting and cheat prevention, etc...
But we'd like some way to allow anyone to connect and leave a server
Is host migration at all possible using listen servers?

#

I don't know too much about OSS Steam. I was just told to use UWorks instead.

#

Ahh I read into OSS Steam. Yeah I'm using UWorks instead.

#

If I'm being dumb on something lmk. I don't know a lot about this yet

gleaming vector Oct 5, 2018, 9:16 AM

#

I have never used UWorks

#

so I can't help you there

twin juniper Oct 5, 2018, 9:17 AM

#

It's the SDK and webapi (and probably more) accessible in blueprints and c++
I'm sure I butchered explaining it.

gleaming vector Oct 5, 2018, 9:17 AM

#

yea, i know what it is

twin juniper Oct 5, 2018, 9:17 AM

#

Ahh ok

#

My bad

gleaming vector Oct 5, 2018, 9:17 AM

#

i've just never used it so I have no idea if it implements stuff

#

I've shipped a game using the steam online subsystem (as bad as it is)

#

so I know very well how it works

twin juniper Oct 5, 2018, 9:17 AM

#

Do you know any possible way to run servers cheaply where a host doesn't have to stay in the server?
Or am I stuck between dedicated servers or listen servers.

gleaming vector Oct 5, 2018, 9:17 AM

#

you are stuck with dedicated servers or listen servers with Unreal

#

i know there was a time when Epic considered doing Host Migration

#

but I have no idea what happened to it

twin juniper Oct 5, 2018, 9:18 AM

#

Ughh okay. Thanks a shit ton for the info, though!

#

I was able to send a lot of data through steam's p2p system using UWorks. Made my own protocol and stuff to read it.
But there's just so much data that UE4 sends that I don't know about

#

I had motioncontrollers and headset replicating perfectly.
But I had no idea how to do character movement

#

Im sure my system was probably ghetto af and wouldn't work.
I started a steam lobby for the world you were in.
To join, you'd download the world from the steam workshop, then join the steam lobby.
Each player would get a notifcation you joined the lobby, verify and auth you, and spawn a character using your steam id
Then I sent needed replicated data to each lobby member using steam P2P.
But it's SO different than how UE4 works, I've been having to rethink everything I know about networking

ember needle Oct 5, 2018, 12:14 PM

#

can someone explain to me the replication of a custom "always relevant" actor and rep notify?

#

what I'd like to know is, given that I set all replicated variables server side in the construction script

#

is the event begin play called on the client only after the variables have been replicated?

#

is the on rep notify event always called, or is there some timeout that if the client connects too late won't be called?

#

right now i'm basically keeping track of both events and ensuring it gets called only once

winged badger Oct 5, 2018, 12:31 PM

#

client will exec the construction script too

#

when it constructs the actor on its end

ember needle Oct 5, 2018, 12:31 PM

#

of course but in the script i randomize only on who has authority and set vars only server side

winged badger Oct 5, 2018, 12:32 PM

#

just to trigger repnotifys?

#

seems ineffective

trim dirge Oct 5, 2018, 12:41 PM

#

Begin Play Event doesn't work when i change the game mode of the level, what is that?

flint star Oct 5, 2018, 12:42 PM

#

can I get a notification on client when it recieves new variable value via replication?

jolly siren Oct 5, 2018, 1:21 PM

#

@flint star Of course. That is what OnRep (RepNotify in BP) is for

#

Does anyone with experience with the replay system understand what this strange movement with my first person mesh could be? It's like it is leaning in the direction of my movement. Is there something I need to smooth out? https://youtu.be/i6-aymiQcjY?t=39

YouTube

Ethan Thornburg

2018 09 20 08 50

▶ Play video

flint star Oct 5, 2018, 1:32 PM

#

@jolly siren and does UE replicate the value every tick, or only when it changes?
I want to replicate player customization options, but they won't change very often

#

and I would rather not use RPC for that

thin stratus Oct 5, 2018, 1:32 PM

#

:O Instant replay

#

For real, if you get that to work, you need to tell me how

#

I always thought the replay system is for recording and later watching the recorded file

jolly siren Oct 5, 2018, 1:34 PM

#

Yeah, I've got most of it working. This strange mesh movement is a pain tho

#

They have multiple streamers

thin stratus Oct 5, 2018, 1:34 PM

#

BLOG POST

jolly siren Oct 5, 2018, 1:34 PM

#

See InMemoryNetworkReplayStreaming

thin stratus Oct 5, 2018, 1:34 PM

#

It's only the MeshMovement of the FP mesh doing that?

#

Or do you see the same if the guy who got killed moved?

#

So basically do the same you did, but move the person who's killed a bit left and right before killing them

#

To see if their mesh also lags

jolly siren Oct 5, 2018, 1:36 PM

#

okay will do. I'm pretty sure that theirs doesn't lag like that

#

CMC has this strange "smoothing" code for playing back replays that sets the third person mesh's relativelocation to a constant value. I don't understand how that could be smoothing anything tho. It is just setting it to the offset that was cached when the character was created

#

https://github.com/EpicGames/UnrealEngine/blob/5e997dc7b5a4efb7f1be22fa8c4875c9c0034394/Engine/Source/Runtime/Engine/Private/Components/CharacterMovementComponent.cpp#L7188

#

The relative location of the first person mesh doesn't change in the replay when I just move forwards and backwards

#

okay going to record what you asked now

#

I also tested setting the viewtarget to the simulated character in normal gameplay to see if I would see this strange movement with the first person mesh and it doesn't happen in normal gameplay; it only happens in the replay

#

@flint star only when it changes

flint star Oct 5, 2018, 1:50 PM

#

sweet thanks

#

i was afraid I needed to use RPC multicast for low frequency game state changes

jolly siren Oct 5, 2018, 1:54 PM

#

@thin stratus The movement of the person who was killed looks smooth

#

https://youtu.be/clAHZNj4fCk

YouTube

Ethan Thornburg

2018 10 05 09 55

▶ Play video

thin stratus Oct 5, 2018, 2:05 PM

#

Looks like only the Player Owned Mesh doesn't update properly

#

Is there maybe some silly boolean not ticked?

jolly siren Oct 5, 2018, 2:06 PM

#

None that I have found. The player owned third person mesh looks okay tho when I play the killcam in third person instead of first

#

CMC is a monstrosity, been digging through it for a while. The replay portions aren't very large tho

#

Basically everything that is wrapped in if (NetworkSmoothingMode == ENetworkSmoothingMode::Replay)

#

The main 2 functions are SmoothClientPosition_Interpolate and SmoothClientPosition_UpdateVisuals

#

It doesn't really make sense tho becaue the first and third person meshes are both attached to the capsule component

#

The capsule and camera movement all looks smooth

#

The only third person mesh smoothing stuff I can find is this https://github.com/EpicGames/UnrealEngine/blob/5e997dc7b5a4efb7f1be22fa8c4875c9c0034394/Engine/Source/Runtime/Engine/Private/Components/CharacterMovementComponent.cpp#L7188

#

I tried doing that for the first person mesh in tick but that didn't fix it

#

Also, this is testing without any network lag

subtle peak Oct 5, 2018, 3:53 PM

#

Hey this crashes my project when spawned. It worked before I tried replicating it, but only on the server of course. Am I doing anything wrong here? Using 4.20.3

📎 UMGCrash.PNG

slate veldt Oct 5, 2018, 4:17 PM

#

Hey all, still struggling with getting out multiplayer working without typing in the console command.
After some more investigation recently, it would appear that the client send a connection request via the UPendingNetGame class, and then is expecting to receive a reply to begin handshake and also for the host to being challenging it (during which time it receives information on the map etc)

Our host is receiving the client connection request, but appears to be doing nothing with it.

Any help would be appreciated:
https://answers.unrealengine.com/questions/824573/view.html

charred crane Oct 5, 2018, 4:42 PM

#

Anyone have experience with converting to dedicated server architecture? I've got a few questions.

winged badger Oct 5, 2018, 6:39 PM

#

@subtle peak the actual error would be helpful

#

also accessing the UI directly from RPCs is not likely to work as expected

strong abyss Oct 5, 2018, 9:44 PM

#

Hey all, I'm working on a multiplayer FPS and have a 3rd person mesh and a first person mesh on my player character. At BeginPlay, I spawn the correct weapon and need to attach it to the correct socket. If it is a local player, I want to attach it to the fpp mesh, if it is not a local player, I want toattach it to the tpp mesh. But I have to spawn the weapon on the server correct? So I'm not sure where the logic for this local/notlocal check and attachment should be?
Right now it looks like

If (hasauthority) spawn and attach weapon to third person
}```

winged badger Oct 5, 2018, 10:34 PM

#

is that a dedicated server @strong abyss ?

strong abyss Oct 5, 2018, 10:35 PM

#

Nope.

winged badger Oct 5, 2018, 10:36 PM

#

then the above code won't work for the host

#

if that BeginPlay is inside your PlayerCharacter you want to check IsLocallyControlled() instead

#

also, the attachments replicate out of the box

#

so if you slap a weapon to 3rd person mesh on server, you will do it for the owner as well

#

like with the meshes themselves, you will need the separate physical representation of the weapon for the 1st person one

#

and adjust their visibility with OwnerNoSee/OnlyOwnerSee

#

adjusting the local attachment after the weapon is spawned and attached might work

#

i never did any FPS, so not sure

strong abyss Oct 5, 2018, 10:43 PM

#

Dang okay. Just having two weapon models for the weapon and syncing up all the effects and stuff between the two seems like a lot of work. I am trying to adjust the local attacment after the weapon is spawned right now to hopefully save some work.

wide chasm Oct 6, 2018, 12:43 AM

#

How would I speed up the player, but delay the camera for the sped up player so for the other player they look fast but for the player that is sped up it would look like they are moving at normal speed and the world is slow?

#

Kinda complicated question

unique thunder Oct 6, 2018, 3:08 AM

#

📎 unknown.png

#

This runs via server RPC but clients don't see the transform change

#

📎 unknown.png

vivid siren Oct 6, 2018, 7:40 AM

#

Hey, I haven't tested yet, just wondering what the deal is with multiplayer vehicles. Is vehicle movement already replicated nicely like player movement? Thanks.

grand kestrel Oct 6, 2018, 7:49 AM

#

Their physics are utterly terrible and they have no prediction, you will feel the latency

#

Currently there are no good solutions for MP vehicles, Blue Man's is closest, and has nice physics, but wouldn't hold your breath for client-side prediction

#

@vivid siren

twin juniper Oct 6, 2018, 12:13 PM

#

Hey guys, I am kinda noob to UE4 and trying my best to learn it and I want to create a game with MMO elements.I was wondering if I can create the game as single-player like then make it MMO... Is it possible to do it this way and would it be easy for me to switch when the game is ready-ish?

fallen oracle Oct 6, 2018, 3:10 PM

#

no, you need to build your game for multiplayer in mind

#

I have a problem. I have a character, which has skill which are different actors. the Owner of the skills is the Character. When replicating it, sometimes the Owner pointer of the skill is null at beginPlay. after some debugging, I found out that the skill was replicated before the owner, which is kinda strange... Is there any way to force the owner to replicate before the owned item?

#

Or am I wrong thinking that the owner should always replicate before the owned actors? I thought thats exactly what owner is for

#

Why I need this is to be able to call functions of the actor without checking if its valid in every possible function

winged badger Oct 6, 2018, 4:17 PM

#

the NetDriver doesn't sort the Actors that need replicating by Ownership

#

you can be sure that the pointer is valid after OnRep_SkillRef

#

but there is no way to avoid nullchecks

copper portal Oct 6, 2018, 7:55 PM

#

@thin stratus that problem with the widget not showing for everyone is still there. I have done everything you asked me to do

thin stratus Oct 6, 2018, 7:56 PM

#

Yeah not sure right now. You'll have to keep debugging

twin juniper Oct 7, 2018, 6:46 AM

#

Is there ant way to get the data that unreal is about to send oger the network?
Looking for an easy way to capture it and send it p2p

dusky willow Oct 7, 2018, 9:03 AM

#

hello to everyone who can know how to make multiplayer only through the server without creating hosts

slim holly Oct 7, 2018, 1:32 PM

#

https://en.wikipedia.org/wiki/Network_topology

Network topology

Network topology is the arrangement of the elements (links, nodes, etc.) of a communication network. Network topology can be used to define or describe the arrangement of various types of telecommunication networks, including command and control radio networks, industrial fie...

#

make a ring or mesh. Generally avoided in multiplayer due to increased bandwidth usage and lack of authority in network

fair oak Oct 7, 2018, 2:55 PM

#

Hey, I have been given a test from a company I would like to work at, so far I have done all of the tasks except one - include multiplayer to my actors, so far I have tried to make it work by searching the internet, and after 20 hours trying It still doesn't work, It would really help me if anyone can tell me what I'm doing wrong with this example code I have provided

UFUNCTION(Server, Reliable, WithValidation)
void Server_DestroyActor();
bool Server_DestroyActor_Validate();


// MyActor.cpp
#include "UnrealNetwork.h"

void AMyActor::Server_DestroyActor()
{
    Destroy();
}

bool AMyActor::Server_DestroyActor_Validate()
{
    return true;
} ```

#

I would like to make a function that when an actor is destroyed on the client, it is destroyed on the server as well

#

My code is a lot more complex so to make it easier i just created one example function, and If I can get it to work I will be able to figure out everything else

winged badger Oct 7, 2018, 3:15 PM

#

the Server functions require 1 declaration and 2 definitions

#

/.h
UFUNCTION(Server, Reliable, WithValidation)
void Server_DestroyActor();
/.cpp
void AMyActor::Server_DestroyActor_Implementation() {}
bool AMyActor::Server_DestroyActor_Validate() { return true; }

#

declaring the _Implementation and _Validate explicitly is not required since 4.15, unless you want to make them virtual

fair oak Oct 7, 2018, 3:18 PM

#

I see, thank you I will definitely try your solution!

winged badger Oct 7, 2018, 3:19 PM

#

it is an awkward solution

#

which might cause troubles down the road

#

like disconnecting your client completely

#

the MyActor in question also needs to be Owned (directly or indirectly) by your PlayerController

#

for that to work

#

otherwise "No owning connection for..."

#

@fair oak

fair oak Oct 7, 2018, 3:22 PM

#

Okay I will try updating my code then

winged badger Oct 7, 2018, 3:25 PM

#

i do suggest reading the Networking Compendium, link pinned on this channel

fair oak Oct 7, 2018, 3:25 PM

#

Oh I see

#

I didnt notice that

fair oak Oct 7, 2018, 3:43 PM

#

Thank you for your help I will see if I can get it to work now

#

@winged badger

#

I really appreciate it

chrome bay Oct 7, 2018, 3:43 PM

#

You should only destroy actors from the Server

#

I can't see any situation where a client should be in charge of destroying actors

fair oak Oct 7, 2018, 3:45 PM

#

So let's say I have 1 client who is shooting at a box, I should replicate box health, and make a server check if health <=0 Destroy it?

chrome bay Oct 7, 2018, 3:45 PM

#

Yeah

fair oak Oct 7, 2018, 3:45 PM

#

Oh I see, thank you!

chrome bay Oct 7, 2018, 3:45 PM

#

Otherwise it's all too easy for a client to cheat by saying "I did 1 million damage to this player, kill them pls"

#

Client would just tell the Server it's firing, and probably the direction/location of the shot etc - Server handles the effects of the shot

#

I recommend studying ShooterGame if possible

fair oak Oct 7, 2018, 3:47 PM

#

Yes I see your point, at the moment I need to make anything multiplayer related work, and then i will modify things more to make more sense

#

What do you mean by studying ShooterGame? @chrome bay

thin stratus Oct 7, 2018, 3:56 PM

#

The C++ Shooter Project of Epic Games

#

Which you can download and study from the Launcher

#

In addition you can also study Unreal Tournament, as long as you already have setup your Account for GitHub

#

(Also C++)

fair oak Oct 7, 2018, 4:00 PM

#

📎 unknown.png

#

You mean this one?

#

Twin Stick Shooter?

#

nevermind i have found it

#

📎 unknown.png

#

but I have also found this game

#

which I think will be more helpful for me to study the code

#

https://i.imgur.com/O7qGwkz.png

Imgur

chrome bay Oct 7, 2018, 4:12 PM

#

Yeah both will be pretty useful. The examples themselves are pretty dated now but the same concepts still apply

fair oak Oct 7, 2018, 4:13 PM

#

Yes, they will almost definitely help me

#

I'm pretty new to unreal engine, I was programming in Unity before, and I'm 100% self taught programmer

#

I didn't know there were projects to study

#

which for me is the most efficient way of studying

chrome bay Oct 7, 2018, 4:14 PM

#

Yeah it's definitely the best way, you can step through it and work out how/why it works the way it does etc.

#

MP isn't easy though by any means

fair oak Oct 7, 2018, 4:15 PM

#

Exactly, and You have a working code instead of trying to figure out what is wrong

#

Yes, basically I have never done multiplayer, so I was given a test

#

in which i have 1 more week to make it work haha 😄

#

I will do my best to succeed though

rose egret Oct 7, 2018, 5:13 PM

#

how the movement of ACharacter controlled by AI is handled? on clients their position jumps when they are not following a straight path

chrome bay Oct 7, 2018, 7:07 PM

#

AI sets the "velocity" to the next path point, movement component just follows it

copper portal Oct 7, 2018, 10:47 PM

#

How can I display a widget for everyone?

knotty frost Oct 7, 2018, 10:56 PM

#

Since upgrading to 4.20.3 from 4.19.2, OnlineSubsystemSteam is no longer dynamically loaded by dedicated server builds despite still being specified in DynamicallyLoadedModuleNames. The quick fix is to copy everything inside of WindowsServer\Engine\Binaries\ThirdParty\Steamworks\Steamv139\Win64 to WindowsServer\Game\Binaries\Win64 during the packaging process, but this is obviously not desired, does anyone have a solution? Issue does not affect client builds.

left marsh Oct 8, 2018, 12:10 AM

#

Is there a way to identify which "Instance" of the game a Log is coming from? I am using PIE with multiple players and am getting several duplicate messages.

fair oak Oct 8, 2018, 12:56 AM

#

https://i.imgur.com/G3IVRfG.png

Imgur

#

The file compiles

#

with no errors, should I just ignore that red underline?

cloud ledge Oct 8, 2018, 12:59 AM

#

Yes

#

Those functions are generated and Intellisense/VAX don't always pick them up correctly

unique thunder Oct 8, 2018, 1:01 AM

#

if I run a replicated timeline with a transform lerp on RepNotify, will new joiners get the correct alpha or will it run the event from 0?

fair oak Oct 8, 2018, 1:06 AM

#

God Damn! I was thinking something was wrong all this time, and kept looking for fixes

#

wasted 5 hours trying to fix it, without trying to compile

#

haha 😄

fluid prawn Oct 8, 2018, 2:15 AM

#

I have a random question regarding tick rate for Unreal engine. For a large scale multiplayer server, at what point does the Engine break down tick rate wise. For example Fornite runs at 30 hz which is as far as I'm concerned is the best there is for BR level scale. Why haven't they brought it up to 60 hz? can you just throw more bare metal at it and get those update rates?

cloud ledge Oct 8, 2018, 2:17 AM

#

You can

fluid prawn Oct 8, 2018, 2:17 AM

#

hi black fox

#

lol

cloud ledge Oct 8, 2018, 2:18 AM

#

They made a choice to go down to 30 Hz, but it's kinda an arbitrary choice

fluid prawn Oct 8, 2018, 2:18 AM

#

So basically they made an economical choice

#

I mean every single BR game is in the sub 30hz range

#

so I am thinking that its a engine limitation

#

at certain scale

cloud ledge Oct 8, 2018, 2:19 AM

#

They foresaw possible issues from 60 Hz (more networked traffic, more calculations for large number of players, more precision in bad or good context, etc) and decided to pick 30 Hz

fluid prawn Oct 8, 2018, 2:19 AM

#

So let me as you this then would a large scale melee game require more update than an fps game?

#

at the same scale

cloud ledge Oct 8, 2018, 2:20 AM

#

Hmm

#

It's kinda hard to make a generic suggestion here, it all heavily depends on what happens in the game 😄

fluid prawn Oct 8, 2018, 2:20 AM

#

well

cloud ledge Oct 8, 2018, 2:20 AM

#

Better to just test it at different rates yourself and see when it starts to break down

fluid prawn Oct 8, 2018, 2:21 AM

#

lets say you made dark souls at BR Scale

#

100 people

#

but ya i suppose most people that play a melee game would want something at min under 100 ms

#

which is

cloud ledge Oct 8, 2018, 2:22 AM

#

Dark souls, BR scale... I'd go with like 16 Hz haha

fluid prawn Oct 8, 2018, 2:22 AM

#

yeah

#

around there

#

which i think with UE4 is doable

cloud ledge Oct 8, 2018, 2:22 AM

#

It would be terrible-ish

#

And 16 Hz would be do-able, I'm sure of it

fluid prawn Oct 8, 2018, 2:22 AM

#

im sure if it got to that scale

#

i would start calling up Epic games to get involved

#

haha

cloud ledge Oct 8, 2018, 2:23 AM

#

Even if all players are moving and attacking all the time, at 16 Hz you won't be doing that much

#

And yes, you are surprisingly making a good point haha

#

If your game manages to attract 100 people on a single server, you probably should call up Epic Games 😄

fluid prawn Oct 8, 2018, 2:23 AM

#

yeah they have an army working on the netcode

#

you know I was thinking for the predictive part of the net code

#

to insert machine learning

#

to determine if a hit was done

#

i think that would work well

cloud ledge Oct 8, 2018, 2:24 AM

#

It's an interesting idea certainly

fluid prawn Oct 8, 2018, 2:25 AM

#

you probe it in your netcode to run in parallel get the client data position etc on both sides and what the server decided as inputs to the model

#

and train that bad boy hard

#

and then you just slide it in later

#

anyway I'm talking like im gonna do this haha but perhaps when im start on my game I'll test this theory

#

shit dude i did a google search and nobody has done this idea

grand kestrel Oct 8, 2018, 6:06 AM

#

Really would be horrible with any latency at all

#

Even with amazing netcode

astral gust Oct 8, 2018, 11:50 AM

#

Hi guys, would you mind sharing some experience and tips in this thread: https://forums.unrealengine.com/community/general-discussion/1537016-unreal-engine-network-engineering-case-studies-and-experiences ? Thanks for the pinned messages as well, they are a good read! 😃

Unreal Engine Forums

Hi all,

As a team of game development students we're currently in pre-production of a survival game using Unreal Engine 4. Since Epic Games has gone quite open

north trout Oct 8, 2018, 12:36 PM

#

yeah in 4.20 they introduced a new feature for handling a lot of actors

#

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

YouTube

UnrealEngine

Networking in 4.20: The Replication Graph | Feature Highlight | Un...

Working on a multiplayer game? Are there many players in-game together? On this livestream, our networking team will demonstrate 4.20's new Replication Graph...

▶ Play video

#

@astral gust

astral gust Oct 8, 2018, 1:16 PM

#

Thank you!

#

How do you feel about this structure? I haven't been able to add the delegates and player controllers, but it should describe the hierarchy of the UClasses/Instances.

📎 Diagram_UENetMode_2.png

north trout Oct 8, 2018, 1:33 PM

#

uh not really qualified^^

astral gust Oct 8, 2018, 1:34 PM

#

Alright, no worries.

meager mirage Oct 8, 2018, 5:21 PM

#

i'm getting a bit stuck trying to get a bool array representing a visibility mask replicated initially, depending on the map size being used it can be big or small. replication is exploding when it gets a 40k array is thrown at it, 20k worked fine. everything afterwards is just tiny bits updating as needed.

fair oak Oct 8, 2018, 8:16 PM

#

I can't seem to figure out why projectile isn't replicating, so when I shoot it on the clinet it should show up on the server

#

but it doesn't

#

https://i.imgur.com/9plfsiv.png

Imgur

#

https://i.imgur.com/Mlb4uah.png

Imgur

#

I can copy paste code if you need

thin stratus Oct 8, 2018, 8:17 PM

#

hastebin.com

#

Is a thing :P

fair oak Oct 8, 2018, 8:18 PM

#

Thank you, I'm a new programmer

thin stratus Oct 8, 2018, 8:18 PM

#

Or any other bin you know

fair oak Oct 8, 2018, 8:18 PM

#

Self Thaught, I didn't know these existed

#

Well I never needed these before

thin stratus Oct 8, 2018, 8:18 PM

#

Also Replication is only Server to Client

#

You can't spawn something on the Client to make it show up on the Server

#

It has to be Spawned by the Server in the first place

fair oak Oct 8, 2018, 8:25 PM

#

This is my code, I will try to include your tips now

#

and thank you for help!

fair oak Oct 8, 2018, 9:13 PM

#

EDIT: I possibly made a huge mistake, no need to help anymore 😃

versed rock Oct 8, 2018, 9:52 PM

#

Hey everyone, I'm learning multiplayer and just trying to wrap my head around widget creation multiplayer. on the client, there is 2 widgets created, and on the server its 1

winged badger Oct 8, 2018, 10:07 PM

#

widgets are created locally

#

use the HUD to do it, as its unique to each playercontroller and not shared

versed rock Oct 8, 2018, 10:39 PM

#

Ahh i see, got it now thanks heaps!

#

Got another issue here, not too sure what's happening. server only detects 1 player and client has 2 players

📎 unknown.png

#

I'm using Get Game State then the Player Array off that

copper portal Oct 8, 2018, 11:56 PM

#

I have a wall sliding function and I want the player to have the ability to double jump each time the player touches the wall. I tried setting the jump count to 0 but that doesnt work, for some odd reason. I am setting this https://gyazo.com/208169b01543efa7cde13cef8a898bf1 variable to 2 in my character bp. I am using paper2d btw. The jumpcount that I set to 0 is a custom var. This is how I make the player stop jumping in my tick event: https://gyazo.com/fc1b356d4d162b2fe84d66b72da18eee and this is how I handle jumping when the player press the jump button: https://gyazo.com/faa4946c570fdd53ca56cd23c7c13464

Gyazo

next falcon Oct 9, 2018, 12:13 AM

#

if i start a multiplayer with 2 players and print for both the object name
it should be like:
ThirdPersonCharacter.C_0
ThirdPersonCharacter.C_1

Right?

copper portal Oct 9, 2018, 12:22 AM

#

looks right

next falcon Oct 9, 2018, 12:23 AM

#

jeah i expected that but both of my characters print
ThirdPersonCharacter.C_0
ThirdPersonCharacter.C_0

copper portal Oct 9, 2018, 12:30 AM

#

why do you need this information?

#

cuz if you are trying to do something with names of characters then there is probably a more efficient way of doing it

next falcon Oct 9, 2018, 12:30 AM

#

i use the Get controller on it and gives me ONE controller for two characters for diffrent players

#

oh okay nvm

#

the server knows diffrent controllers
the clients are the same

#

wait no

#

in one of my project its like that
in the other it doesn'T

#

ill watch it

#

its a component on the character..
its seems like the component is shared by all characters..

#

Okay i found my fail
i used Get Player Pawn instead of Get Controlled Pawn As Server..

subtle nymph Oct 9, 2018, 1:10 AM

#

I cannot get the first person template projectile to replicate on the Z axis for clients

#

It only fires at one vertical angle, but still moves with the player and the horizontal angle that they are looking in

thin stratus Oct 9, 2018, 6:14 AM

#

@versed rock Most likely because you never tell the Server to Refresh the List

#

The same will happen if you join with a 3rd Player, where the 2nd Player will only see two and the 3rd sees all three.

#

To make it easier for yourself, use the Tick event in your Widget.
Create a Variable called "LastNumPlayers". In tick, Compare "LastNumPlayers" with the Length of the PlayerArray.
If they are unequal it means that the number of Players changed.
So Refresh the List and set the "LastNumPlayers" to the new value (Length of the Array).

#

While I hate doing polling (so checking a value on tick), it has proven to cause much less headache in terms of syncing up the PlayerList.

#

The only other way I found was using a custom PlayerState Array (so not PlayerArray), which is marked as RepNotify.
And then updating the Array from ServerSIde and telling everyone to Refresh the List in the RepNotify funciton

#

But even that had problems iirc.

gusty lily Oct 9, 2018, 7:25 AM

#

Looking for some advice on creating Multiplayer potential for a simple pvp platformer. What would be the best way to allow players to hook up to each other via a user interface. Also, do you need to be port forwarding for remote a listen server setup?

thin stratus Oct 9, 2018, 7:26 AM

#

Easiest solution is always using a Subystem that provides a MasterServer and then letting users Host Sessions and using a simple ServerList that retrieves and shows the Sessions.
Port Forwarding should be required as long as you aren't doing any NAT PunchThrough.

#

ListenServers are however the Authority, so this is not save agianst cheating. If you don't care about cheating then that's fine.

#

Subsystem that supports Sessions (Online) and even has NatPunchThrough is for example Steam.

#

@gusty lily

warm meadow Oct 9, 2018, 8:02 AM

#

Hi, I have finaly build a dedicated server but I want to run it on different port (multiple instance on one machine that run on different port). I'm running the server with these command server.exe -log -port 7778 but port is always 7777 😦

#

ok, found the problem. Right command is:
server.exe -log -port=7778

gusty lily Oct 9, 2018, 8:13 AM

#

@thin stratus thanks for that. Using a subsystem may be easier to achieve than setting up nat punchthrouh I gather? Most people seem to recommend steam, is that a good way to go or is there a simpler way? Cheers again

celest falcon Oct 9, 2018, 8:24 AM

#

So I'm working on a multiplayer project, and it's gonna be turn based. This is the first time I'm doing something turn-based in Unreal, but I can hardly find any documentation/tutorials on this (and what's out there mostly covers grid-based movement turns with custom node functions, which my game does not use). Any good tutorials out there on the turn-based nodes and project setup?

cloud ledge Oct 9, 2018, 8:24 AM

#

There are general tutorials on multiplayer networking for turn based games, that are not UE4 specific

thin stratus Oct 9, 2018, 8:31 AM

#

@gusty lily It basically the way to go if you want online Sessions.

#

I mean sure you can do that yourself or find another sort of subsystem, but in terms of easy and features, steam is the best I guess

#

Not sure if the Turnbased Nodes even work out the box? @cloud ledge @celest falcon I've never seen one using them

#

Seems like the Turnbased nodes are Subsystem nodes

#

So I assume they only make sense if the Subsystem supports turn based stuff?

#

Might be better to code your own TurnBased solution

celest falcon Oct 9, 2018, 8:35 AM

#

Yeah, pretty much all I could find was https://api.unrealengine.com/INT/BlueprintAPI/Online/TurnBased/index.html

Turn Based

#

But I couldn't find a thing on how to use them/how they should work

thin stratus Oct 9, 2018, 8:36 AM

#

IOnlineTurnBasedPtr FOnlineSubsystemSteam::GetTurnBasedInterface() const
{
    return nullptr;
}