#multiplayer | Unreal Source | Page 338

ruby epoch Aug 17, 2017, 6:35 PM

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also, when I spawn emitter

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I make set only owner see

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and getting error

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but all looks fine

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that wrong?

thin stratus Aug 17, 2017, 6:57 PM

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You mean Pitch is not replicated?

ruby epoch Aug 17, 2017, 7:11 PM

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Maybe

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but if i set "Use Controller Pitch Input"

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all seems fine

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maybe I should multicast input event?

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InputAxis LookUp

lone iron Aug 17, 2017, 7:38 PM

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just trying to work out basic projectile prediction, how do I test for client? I get you can use Role < ROLE_Authority for server, but what's the client equivalent?

pallid mesa Aug 17, 2017, 7:38 PM

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gona give you a little example

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void AShooterWeapon::StartFire()
{
    if (Role < ROLE_Authority)
    {
        ServerStartFire();
    }

    if (!bWantsToFire)
    {
        bWantsToFire = true;
        DetermineWeaponState();
    }
}

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void AShooterWeapon::ServerStartFire_Implementation()
{
    StartFire();
}

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here you wanna call the server implementation when the Role < ROLE_Authority

lone iron Aug 17, 2017, 7:40 PM

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ok

pallid mesa Aug 17, 2017, 7:40 PM

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remember that the replication is always from server to clients

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NEVER from clients to servers

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if you want smt to update on the server gotta use a RPC

lone iron Aug 17, 2017, 7:41 PM

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mk

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that won't have a delay between user input and projectile being shot as affected by lag..?

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i assume not

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..wait a sec, what? what's going on there? that looks like it should be an infinite loop?

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wouldn't StartFire inside the implementation being called then call ServerStartFire and continue like that?

pallid mesa Aug 17, 2017, 7:45 PM

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no it is not an infinite loop because of networking context

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if you wanna know more about networking i recommend you taking a read to the @thin stratus networking conpemdium, it is available here http://cedric-neukirchen.net/2017/02/14/multiplayer-network-compendium/

Cedric Neukirchen

eXi

Multiplayer Network Compendium

lone iron Aug 17, 2017, 7:46 PM

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alright, wil do

pallid mesa Aug 17, 2017, 7:46 PM

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and no, currently unreal doesnt implement lag compensation

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thats something you may want to do by yourself

lone iron Aug 17, 2017, 7:47 PM

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well, that was sorta the point, i guess I can have a client authoratitive version instead

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cheating shouldn't be an issue here

pallid mesa Aug 17, 2017, 7:48 PM

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i wouldn't recommend you trust on your clients

lone iron Aug 17, 2017, 7:48 PM

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oh yeah- it's really not smart to do in general

pallid mesa Aug 17, 2017, 7:48 PM

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also unreal per definition is server authorative

lone iron Aug 17, 2017, 7:48 PM

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but if it's the only way to have lag compensated projectiles it seems that'll have to do

pallid mesa Aug 17, 2017, 7:49 PM

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you can check out last battlefield 1 patch notes to know more about lag compensation in triple A games

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they are doing something above certain ping value

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to avoid client side produced lag

lone iron Aug 17, 2017, 7:50 PM

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sounds a bit above my skill level that

inner iris Aug 17, 2017, 8:11 PM

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Yeah in BF1 it seems as though shots past a certain ping value are ran on server only. Still for normal pings, trusting the client with at least taking the shot and sending the info for the server to verify / compare seems to be standard in many games.
I currently have a solution to prevent very laggy players hitting unfair shots by having a "error tolerance" sphere collision around each player so if the client gets a player hit, the server also shoots a trace and if it hits anywhere on the error tolerance sphere, the hit is counted. This works great for me and seems to have solved most of my client hitting but server not registering issues with fast moving targets.

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It's most likely not very optimal and error prone in some cases but it has been working like a charm so far.

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My setup uses traces and not projectiles however, they are more complex since they have travel time.

vital steeple Aug 17, 2017, 8:34 PM

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@fossil spoke sorry for the late response. yeah right now i pass everythign to gamestate, then it determines which playerstate should recieve which messaged (based on message type and player team) then creates a small widget that has color coded messages and puts it into a chat box widget that can hold a max of 50 of those minor text widgets. as each new widget gets created, it removes the 50th one and scrolls to the newest message. this system allows for a really flexible notification system that will make it possible to create multiple message types (death notifications, chat, game updates, messages etc) that are scrollable but hopefully dont get too bloated

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it appears to work ok with multiple clients and a dedicated server as a test

compact gulch Aug 17, 2017, 10:11 PM

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has anyone worked closely with creating a custom OnlineSubsystem before?
I'm wondering if it's possible for your game to run steam overlay and all its feature but NOT use SteamOnlineSession to join/host game

timid pendant Aug 17, 2017, 10:40 PM

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Hello how can I get the number of players in each dedicated server that appears in my server browser. I am using a node.js master server and varest to send and recieve requests

brittle sinew Aug 17, 2017, 10:43 PM

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Are you asking how to pull players from a UE4 server or send them via a web request?

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(or both/neither? :p)

timid pendant Aug 17, 2017, 10:46 PM

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Yeah pull number of players and post it with a web request.

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It kinda sounds simple but i dont know how to get players for each server in my db list

brittle sinew Aug 17, 2017, 10:47 PM

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Okay, AFAIK the beacon system is only available for use within UE4 internally, so that presents either a setback or a separate path

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You could have custom code on the servers available to send players to the central server, or you could give enough info to the clients to find the servers and use beacons to fetch the rest on each client locally

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If you're fine with not having all info available outside of UE4, the latter might work

timid pendant Aug 17, 2017, 10:50 PM

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I want to do send the custom code on the servers to the central server but im just confused how it will know which server in my central server to send the num of players too since there is alot.

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I could do a foreachloop since each server is in a list and get num players for each and post it? < Could this work

brittle sinew Aug 17, 2017, 10:51 PM

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Not quite sure what you mean by that, is that where you're displaying the info?

timid pendant Aug 17, 2017, 10:52 PM

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The info will be displayed in a server browser

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So for each server field it has its own players text to show how much players are on that server

brittle sinew Aug 17, 2017, 11:05 PM

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Yeah, so you get that JSON is object-based, where you can have arrays of 'server' objects with all relevent fields

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You can have a global ID system that gets delegated to servers if you'd like, where a server contacts the central server and gets an ID for the game or something like that

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And relate each server object to its ID

timid pendant Aug 17, 2017, 11:10 PM

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The mongodb database has a _id for every server object so i think that might work

twin juniper Aug 17, 2017, 11:59 PM

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can a system like that be tampered with? how do other game services keep their server lists from getting clogged up with bogus entries?

pallid mesa Aug 18, 2017, 12:24 AM

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hi heyoooo idk if this is a question for #cpp or multiplayer because it has mambo

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AShooterWeapon* AShooterCharacter::GetWeapon() const
{
    return CurrentWeapon;
}

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im doing this on the animgraph and it succeed, its a function from ShooterCharacter on ShooterGame

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i defined this function on the anim ShooterWeapon

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float AShooterWeapon::GetADSAmount() const
{
    return ADSAmount;
}

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and its all fine networking wise, it works and updates the camera correctly

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but somehow

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on the animinstance which is on BP

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when i do

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Character->GetWeapon()->GetADSAmount()

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https://gyazo.com/d8f7ea7749d4de1f5d8cb321078f97a2

Gyazo

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this happens

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Blueprint Runtime Error: Accessed None trying to read property CallFunc_GetWeapon_ReturnValue from function: 'ExecuteUbergraph_HeroFPP_AnimationBlueprint' from node: Set ADSAmount in graph: EventGraph in object: HeroFPP_AnimationBlueprint with description: Accessed None trying to read property CallFunc_GetWeapon_ReturnValue

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why it doesnt work in the anim instance

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but everywhere else

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i guessed it coulde be because of the weapon->adsamount

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conection

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but im not sure

jolly siren Aug 18, 2017, 1:13 AM

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is it always None or just at the beginning?

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could just be hitting it before get weapon is valid

trail dragon Aug 18, 2017, 3:23 AM

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If a user is hosting a multiplayer session, should I load the map first and then create the session?

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It seems a little easier except you have to send the intent across the map load

wary willow Aug 18, 2017, 3:24 AM

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Why not just join the session?

trail dragon Aug 18, 2017, 3:24 AM

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They're hosting, they create, no?

wary willow Aug 18, 2017, 3:24 AM

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Your question was stating something else

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Are you asking if the player that's wanting to host, should load the map first then create session?

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If so, then no.

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Create session, then load map.

trail dragon Aug 18, 2017, 3:26 AM

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Yeah that

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Boo, that's harder to program 😦 (but thank you)

wary willow Aug 18, 2017, 3:26 AM

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@trail dragon Why hard?

trail dragon Aug 18, 2017, 3:40 AM

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Have to wait on the latent action and keep them from doing anything evil while it happens :p

trail dragon Aug 18, 2017, 5:19 AM

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So the built in "Create Session" blueprint nodes in Unreal seem to hard-code the session name to always be GameSessionName from CoreOnline.h which is simply "Game".

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However, when I write my own session code and use the same thing, whenever I try to test (via two instances of New Editor Window (PIE) I always get:
LogOnline: Warning: OSS: Cannot create session 'Game': session already exists.
When trying to create a session, and then it fails to create. Is that just because of how I'm testing? If so, what is the correct way to test session stuff, make dedicated builds and run them on different computers?

pallid mesa Aug 18, 2017, 5:38 AM

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@jolly siren just at the begining maybe? But it doednt make sense because wether begining or not, it doesnt retract the current value

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But it does work for the camera

trail dragon Aug 18, 2017, 6:26 AM

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Does Find Sessions not work if you're using two New Window instances not auto-connected to each other?

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I can't decide if I should just assume this stuff will work and only test in builds or what

wary willow Aug 18, 2017, 6:32 AM

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@trail dragon What are you talking about

trail dragon Aug 18, 2017, 6:33 AM

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@wary willow I can't figure out if my session code doesn't work or if I just can't test it the way I am testing

wary willow Aug 18, 2017, 6:33 AM

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Are you on Dedicated or just Listen Server?

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Well, first thing is to look at the basic networking tutorial stuff

trail dragon Aug 18, 2017, 6:33 AM

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Listen Server with one process

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Yes I know how the flow works, but when Create Session returns true and then Find Sessions reports zero sessions, I don't know if it's how I'm testing or if there's an issue.

wary willow Aug 18, 2017, 6:33 AM

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Even the 2014 will teach you how to do it

fossil spoke Aug 18, 2017, 6:34 AM

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@trail dragon Pretty sure PIE just uses OSSNULL, so you cant test it in PIE

trail dragon Aug 18, 2017, 6:34 AM

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OSSNULL can't do sessions? I thought it did for lan

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Since Create Session returns true

wary willow Aug 18, 2017, 6:35 AM

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Well, you can set it up

fossil spoke Aug 18, 2017, 6:35 AM

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Its kinda an special case for PIE

wary willow Aug 18, 2017, 6:35 AM

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for LAN

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But he can still get into a session

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from PIE

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Since I've done it before

fossil spoke Aug 18, 2017, 6:35 AM

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I wouldnt test any Multiplayer session creation stuff in PIE since it literally builds and connects all clients for you automatically.

wary willow Aug 18, 2017, 6:35 AM

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What he can't do is Steam from PIE

trail dragon Aug 18, 2017, 6:36 AM

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Yeah I know Steam doesn't work in-editor at all

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There.

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If you have "Use Single Process" checked in the Advanced Options it will fail

vital steeple Aug 18, 2017, 6:36 AM

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you can join your own local game in PIE yeah. i think if you want to test steam you have to build it out and test on two different computers

trail dragon Aug 18, 2017, 6:36 AM

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If you uncheck it, load two clients, do a hard "Open <map>" to disconnect them

wary willow Aug 18, 2017, 6:36 AM

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I've never used single process

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so no idea

trail dragon Aug 18, 2017, 6:36 AM

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then you can Create sessions and Find Sessions will work

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If you have Single Process (even if you have them not auto-connect) FindSessions reports no sessions, presumably because it's ignoring itself

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That was the bit of documentation I was missing is under what specific conditions can you actually test code :p

solar flower Aug 18, 2017, 6:37 AM

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It's on by default

wary willow Aug 18, 2017, 6:37 AM

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what's on?

trail dragon Aug 18, 2017, 6:37 AM

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Auto-Connect Clients to each other

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I know it's on by default, but it makes it hard to test creating and joining sessions if they're already playing together 😉

wary willow Aug 18, 2017, 6:38 AM

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What's on by default?

solar flower Aug 18, 2017, 6:38 AM

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"Use Single Process"

wary willow Aug 18, 2017, 6:38 AM

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ah

trail dragon Aug 18, 2017, 6:39 AM

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If you uncheck Single Process you can no longer force them to not auto-connect which is weird

solar flower Aug 18, 2017, 6:39 AM

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@trail dragon You try disabling Auto Connect to Server?

trail dragon Aug 18, 2017, 6:40 AM

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@solar flower I have it working now. You can test Host/Find/Join sessions under the following conditions:
Single Process is UNCHECKED
Launch two New Editor Window (PIE) instances.
Manually disconnect the clients from each other.

wary willow Aug 18, 2017, 6:41 AM

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hmm

solar flower Aug 18, 2017, 6:41 AM

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It just seems like the other option would fit what you want more closely without side effects

wary willow Aug 18, 2017, 6:41 AM

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Pretty sure I never had to do much

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To test

trail dragon Aug 18, 2017, 6:42 AM

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@solar flower If I wanted to test actual netcode I would enable single process yes since they auto-connect

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But I want to test my menus for finding and joining sessions so

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In addition, if you do not destroy your Session at the end of play, it appears to continue to consume the session by that name until you do destroy it. I assume this is not an issue if multiple separate clients are using the same session name (since that's what BP does), but if you are trying to host and haven't destroyed the last created session (even though you stopped play in the editor) it will fail

trail dragon Aug 18, 2017, 7:03 AM

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Is a Travel URL supposed to contain the map of the destination server? I call SessionInterface->GetResolvedConnectString(SessionName, TravelURL); PlayerController->ClientTravel(TravelURL, ETravelType::TRAVEL_Absolute); which gives me a TravelURL of "192.168.1.244:0", but the client doesn't change maps...? It says it joined the session successfully

trail dragon Aug 18, 2017, 7:18 AM

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^ don't forget to add ?listen to the map you open on the server :<

modern dome Aug 18, 2017, 10:17 AM

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Why don't you use UWorld->ServerTravel?

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@trail dragon

pallid mesa Aug 18, 2017, 11:05 AM

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Btw bout my problem

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It worked

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But didnt use the variable lol

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Imdumb sometimes

sterile pebble Aug 18, 2017, 12:07 PM

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anyonde made any edits to unreal replay system? Netdriver?

twin juniper Aug 18, 2017, 1:34 PM

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Anyone know how to .sav an INT so it can't be opened in WordPad and changed? Not something simple like binary or hexadecimal lol...people can just convert. Like maybe make the .sav hidden?

jolly siren Aug 18, 2017, 2:44 PM

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waaat

signal lance Aug 18, 2017, 4:16 PM

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you can't it is saved in a binary format

tribal elk Aug 18, 2017, 4:16 PM

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Maybe someone can help me here ^^' I have kinda an odd issue (like till 2 hours ago it all worked fine... and I just want to understand what went wrong) I have a singleplayer game ... and suddenly my BeginPlay get's called twice in non-dedicated mode (in dedicated mode too). Branching using IsLocallyControlled works like before. But, I don't want to clutter my code with that so ... as it is single-player. So this should mean i somehow enabled multiplayer ? But as I have no experience with multiplayer iam baffled where that couldve happen.

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I know this is pretty much guess work - but Iam out of ideas..

wary willow Aug 18, 2017, 4:18 PM

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@tribal elk So, you really haven't given us the right info yet. Where is it calling it twice at?

jolly siren Aug 18, 2017, 4:18 PM

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you are testing with one player?

tribal elk Aug 18, 2017, 4:18 PM

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In my characters pawn

wary willow Aug 18, 2017, 4:18 PM

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Pawn or Character?

tribal elk Aug 18, 2017, 4:18 PM

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Character

wary willow Aug 18, 2017, 4:18 PM

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Version?

tribal elk Aug 18, 2017, 4:19 PM

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4.16.3

wary willow Aug 18, 2017, 4:19 PM

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Do you have a custom GameMode? GameState?

tribal elk Aug 18, 2017, 4:19 PM

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Custom GameMode yeah

wary willow Aug 18, 2017, 4:19 PM

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Base or Regular?

tribal elk Aug 18, 2017, 4:20 PM

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?

jolly siren Aug 18, 2017, 4:20 PM

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are you inheriting from GameModeBase or GameMode?

tribal elk Aug 18, 2017, 4:20 PM

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GameModeBase

wary willow Aug 18, 2017, 4:29 PM

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@tribal elk can't reproduce

tribal elk Aug 18, 2017, 4:29 PM

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me neither

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like it just started to happen

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i have no idea :/

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and i just discovered it because it spawned two WidgetBlueprints

wary willow Aug 18, 2017, 4:30 PM

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Show BP?

tribal elk Aug 18, 2017, 4:30 PM

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Plus maybe that helps

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It only happens AFTER i open the same level

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like reload

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Maybe shouldve said that earlier ..

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@wary willow

📎 beginplay-00.PNG

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📎 beginplay-01.PNG

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And adding a branch with IsLocallyControlled it works like before - but I don't get why it needs it now ...

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From the Character - btw

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or did you mean GameMode @wary willow ?

wary willow Aug 18, 2017, 4:35 PM

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@tribal elk Let's move this out of multiplayer and into #blueprint

tribal elk Aug 18, 2017, 4:35 PM

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ok

pliant cypress Aug 18, 2017, 5:32 PM

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could it cause problems if I close a multiplayer map but not destroy the session?

twin juniper Aug 18, 2017, 5:34 PM

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@signal lance The .sav can be edited with as basic as WordPad, it prints the saved value in there near the bottom

trail dragon Aug 18, 2017, 5:34 PM

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@modern dome Join session indicates you should use Client Travel to connect to said session?

topaz gazelle Aug 18, 2017, 5:57 PM

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I have a map with level streaming that works totally fine in single player, can somebody help me out with making it work for multiplayer? (Listen and DC servers)

modern dome Aug 18, 2017, 6:52 PM

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LogNet: Warning: UIpNetDriver::ProcesRemoteFunction: No owning connection for actor ARPG_TravelActor_1. Function ServerInitiateTravel will not be processed.
The Actor is placed on the Map, shouldn't the Server be the Owner then?

brittle sinew Aug 18, 2017, 6:54 PM

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Ownership isn't the "client" or "server"—it's an actor, and no actors have to have an owner

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The server does have authority over that object. I do find it somewhat odd that it would throw that warning either way since you're already on the server, but ¯_(ツ)_/¯

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The docs do make things a tad more confusing since they refer to a "client-owned" or "server-owned" actor, but what those terms refer to is the owning connection to the PlayerController and whose PlayerController owns the object.

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If a client's PlayerController (or something it owns) owns an object, that's a "client-owned" object, but its owner is still simply that PlayerController

modern dome Aug 18, 2017, 6:58 PM

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Hm, I see

twin juniper Aug 18, 2017, 7:08 PM

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you can only call an actor's server RPCs on the client that owns the actor @modern dome

modern dome Aug 18, 2017, 7:09 PM

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Uhm

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I am?

twin juniper Aug 18, 2017, 7:09 PM

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Placing an actor on the map doesn't mean the actor is owned by the client.

modern dome Aug 18, 2017, 7:10 PM

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📎 unknown.png

twin juniper Aug 18, 2017, 7:11 PM

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where are you setting the owner?

modern dome Aug 18, 2017, 7:11 PM

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nowhere?

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I am just placing the actor on the map

twin juniper Aug 18, 2017, 7:11 PM

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ok well then if the actor's owner is null, then it's not owned by the client

modern dome Aug 18, 2017, 7:11 PM

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but why the client? the client has nothing to do with it?

twin juniper Aug 18, 2017, 7:12 PM

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this is a server RPC

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which is client -> server

modern dome Aug 18, 2017, 7:12 PM

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OnComponentBeginOverlap is run on the Server, isn't it?

twin juniper Aug 18, 2017, 7:12 PM

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it's run on both potentially

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depends on how the actor is setup

modern dome Aug 18, 2017, 7:13 PM

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The Server is replicated

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*actor xd

twin juniper Aug 18, 2017, 7:13 PM

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also, if this only occurs on the server, then that is a pointless RPC in the first place

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did you mean to use a client RPC?

modern dome Aug 18, 2017, 7:15 PM

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no

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wait a sec

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The Client needs to own this actor to call Server RPCs right?

thin stratus Aug 18, 2017, 7:16 PM

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yes

twin juniper Aug 18, 2017, 7:16 PM

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yep!

modern dome Aug 18, 2017, 7:16 PM

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Is there a mechanism to set the Owner automatically to the client?

thin stratus Aug 18, 2017, 7:16 PM

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There is a "SetOwner" function

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Or you set it on spawn if it's blueprint

modern dome Aug 18, 2017, 7:17 PM

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Yeah, there's the problem, the Object isn't spawned.
And changing the owner at runtime... is that really the only way?

twin juniper Aug 18, 2017, 7:17 PM

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you can only call an actor's server RPCs on the client that owns the actor @Raildex(edited)```

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pretty much! honestly though it sounds like you don't need the RPC in the first place

modern dome Aug 18, 2017, 7:18 PM

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How's that?

twin juniper Aug 18, 2017, 7:18 PM

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hey could someone checkout what i wrote in #cpp i should have wrote it here

thin stratus Aug 18, 2017, 7:18 PM

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Actors placed in the level are ServerOwned

twin juniper Aug 18, 2017, 7:18 PM

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that event OnOverlap could be bound on the server, occur on the server, etc

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and you wouldn't ever need to call the RPC in the first place

thin stratus Aug 18, 2017, 7:19 PM

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Every event that the Server also interacts with is called on him too

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Like Tick, BeginPlay, Hit, Overlap etc

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You could, if wanted, OnOverlap perform action limited to the server.
Either your stuff or setting the owner to the client who overlapped

modern dome Aug 18, 2017, 7:19 PM

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But if it's owned by the Server, why do I get this warning?

thin stratus Aug 18, 2017, 7:19 PM

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For Input I usually already go onto the server in the Controller/Character

twin juniper Aug 18, 2017, 7:20 PM

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because the client is trying to call the RPC without ownership!

thin stratus Aug 18, 2017, 7:20 PM

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And perform Trace to use something spawned in the map on the server then

modern dome Aug 18, 2017, 7:20 PM

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@twin juniper but it is owned by the server?

twin juniper Aug 18, 2017, 7:20 PM

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mhm, and not the client

modern dome Aug 18, 2017, 7:21 PM

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ay lmao. now I got it.

twin juniper Aug 18, 2017, 7:21 PM

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CuteNew

trail dragon Aug 18, 2017, 7:21 PM

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Ownership != Authority

thin stratus Aug 18, 2017, 7:21 PM

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If you check my Compendium

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You'll see that in the Ownership chapter

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the tables

twin juniper Aug 18, 2017, 7:22 PM

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shameless, non-chalant, self-plug PogChamp

trail dragon Aug 18, 2017, 7:22 PM

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It's a pinned message in this channel 😉

modern dome Aug 18, 2017, 7:22 PM

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I always get these things mixed up

twin juniper Aug 18, 2017, 7:22 PM

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@modern dome everyone does at the start, don't worry bud Cute

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How do i replicate AI movement
i noticed the collider is sitting in place
so thats how i know its not being replicated.

Sometimes, the ai is just flying in the air, and other times it goes through the ground. Im using navigation invokers.

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I come from UE2 Unrealscript replication, so you should be glad things are easier now! Cute

trail dragon Aug 18, 2017, 7:23 PM

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I think it's also confusing with the concept of "if your role is less than x"

modern dome Aug 18, 2017, 7:23 PM

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So, I just need to make sure the Server Version executes BeginOverlap?

thin stratus Aug 18, 2017, 7:24 PM

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It does anyway

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Character or whatever you overlap with the other actor

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and the actor itself both exist on the Server

trail dragon Aug 18, 2017, 7:24 PM

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Well both will potentially execute BeginOverlap, you need to make sure the server version (the one with authority) is the only one who actually triest o call ServerTravel

twin juniper Aug 18, 2017, 7:24 PM

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^^^

thin stratus Aug 18, 2017, 7:25 PM

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@twin juniper Hm, usually AI should be replicated if the Character of that AI is replicated

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AIController is ServerOnly though

twin juniper Aug 18, 2017, 7:25 PM

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yeah, make sure you're using the proper means (character movement component for example) to propagate movement stuff

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@thin stratus https://pastebin.com/kCaU5cZ3

Pastebin

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Check this out?

trail dragon Aug 18, 2017, 7:27 PM

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Is your navigation component set to replicated

modern dome Aug 18, 2017, 7:27 PM

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Like this? @twin juniper

📎 unknown.png

twin juniper Aug 18, 2017, 7:27 PM

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that would ensure that the authority is the one calling it

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at that point, there's no point for the RPC

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since the server is already doing the logic

modern dome Aug 18, 2017, 7:28 PM

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I know, gonna change that

#

but

twin juniper Aug 18, 2017, 7:28 PM

#

so it can be a normal function

#

looks good!

modern dome Aug 18, 2017, 7:28 PM

#

movePawn() isn't executed when a client touches the Actor

twin juniper Aug 18, 2017, 7:28 PM

#

@trail dragon no, should it be?

thin stratus Aug 18, 2017, 7:29 PM

#

@Raildex#6923 Well no, it's executed on the Server Only

#

What is it doing though?

#

Aaaand can't tag offline person again

#

DISCORD

modern dome Aug 18, 2017, 7:29 PM

#

I am offline by default 😄

thin stratus Aug 18, 2017, 7:29 PM

#

Yeah it's random

modern dome Aug 18, 2017, 7:29 PM

#

oh wait. It works.

#

it's just delayed :/

thin stratus Aug 18, 2017, 7:30 PM

#

What is MovePawn doing

#

If it's a rpelicated thing, then yeah, it's delayed

trail dragon Aug 18, 2017, 7:30 PM

#

@twin juniper Well it looks like you execute on the server where to tell it to move, but if that's not replicated I don't know if the changes that it makes will filter down to the clients

thin stratus Aug 18, 2017, 7:30 PM

#

Needs to reach the client again of course

modern dome Aug 18, 2017, 7:30 PM

#

📎 unknown.png

thin stratus Aug 18, 2017, 7:30 PM

#

Yeah that can be executed on Client and Server, but only LocalClient

#

If you call it only on the Server, then the LocalClient has to wait for the Server to move it

twin juniper Aug 18, 2017, 7:31 PM

#

ok, just to clarify, your code will move the teleport object forward

thin stratus Aug 18, 2017, 7:31 PM

#

Ping-wise that can cause a delay

twin juniper Aug 18, 2017, 7:31 PM

#

not the pawn you control

#

@trail dragon ill try to set it

modern dome Aug 18, 2017, 7:31 PM

#

@thin stratus but the pawn won't move when I do it like the way it was before

twin juniper Aug 18, 2017, 7:31 PM

#

and @thin stratus if you scroll up a lil he puts a Role == ROLE_Authority around this

thin stratus Aug 18, 2017, 7:31 PM

#

He wants to move the Pawn to the passed actor

#

I guess

#

I know, I explained him the delay

twin juniper Aug 18, 2017, 7:32 PM

#

ah

#

Does

#

simplemovetolocation

thin stratus Aug 18, 2017, 7:32 PM

#

I guess you should limit it to LocalClient and Server

twin juniper Aug 18, 2017, 7:32 PM

#

not move on the ground

#

and does it not move the collider

thin stratus Aug 18, 2017, 7:32 PM

#

Well wait

#

It's a ServerOwned Pawn or?

#

nvm the Local Client thing then

twin juniper Aug 18, 2017, 7:33 PM

#

you'd hope the pawn he's controlling is owned by the controller haha

#

otherwise I'd have a lot more questions haha

thin stratus Aug 18, 2017, 7:33 PM

#

Okay, what

#

If he is controlled by the PlayerController

#

Why did the ServerRPC fail

#

Or is that a different problem now?

twin juniper Aug 18, 2017, 7:34 PM

#

because this is occuring on some random actor placed on the level

#

it's not a pawn

thin stratus Aug 18, 2017, 7:34 PM

#

Oh, other way round

#

It's called on the Actor and passes the Pawn

modern dome Aug 18, 2017, 7:34 PM

#

TravelActor (Placed on map)
Pawn touches it -> Move Pawn automatically into some void

thin stratus Aug 18, 2017, 7:34 PM

#

Got it

trail dragon Aug 18, 2017, 7:35 PM

#

Is that actor going to persist across the level transition

#

Otherwise ServerTravel would unload it all immediately anyways ?

modern dome Aug 18, 2017, 7:35 PM

#

ServerTravel has nothing to do with it. What I am struggling with is just cosmetic

twin juniper Aug 18, 2017, 7:48 PM

#

<>_<>

#

collision does not seem

#

to want to be replicated

twin juniper Aug 18, 2017, 8:57 PM

#

@twin juniper collision technically isn't replicated

#

the server does it

#

and the clients simulate it

thin stratus Aug 18, 2017, 9:01 PM

#

Yeah, if hte Client has no collision, it might lag a bit

#

Cause he will fall the whole time and the ngetting corrected :P

twin juniper Aug 18, 2017, 9:02 PM

#

^^^

twin juniper Aug 18, 2017, 9:31 PM

#

@twin juniper @thin stratus yeah but how do i fix that

#

http://i.imgur.com/MrdASkL.png

Imgur

#

Red box on the right, its hard to see but its the collider

#

and the cat is floating

#

i dont get it...

twin juniper Aug 18, 2017, 10:27 PM

#

http://i.imgur.com/2bYLAlc.png

Imgur

#

is this really

#

a 2 hour and 22 mins concept?

#

i think not.

#

http://i.imgur.com/kWW5s9j.png

Imgur

#

paid by the hour

#

im assuming

twin juniper Aug 18, 2017, 10:46 PM

#

so what ive realized now

#

is that client sided ai prediction is crap

tall grove Aug 18, 2017, 11:11 PM

#

Hi , im noob on multiplayer things , how can client replicate things? I saw tutorial videos but , here the client never interact first :https://www.youtube.com/watch?v=wutqpyDKnCQ&index=3&list=PLZlv_N0_O1gYwhBTjNLSFPRiBpwe5sTwc

YouTube

Unreal Engine

3 - Function Replication

This video shows you when to use function replication versus variable replication and discusses the concept of reliable versus unreliable function calls in B...

▶ Play video

thin stratus Aug 18, 2017, 11:11 PM

#

Clients can't replicate

#

They need to ask the Server to do so

tall grove Aug 18, 2017, 11:15 PM

#

Thanks , so for things like doors ,chest . What is the best strategy RPC or Onrep variable?

trail dragon Aug 18, 2017, 11:45 PM

#

Can anyone explain how seamless travel works

#

Do you just have to enable it on the game mode and then it'll just work (tm)?

#

I know that it loads a loading-map between the two.

twin juniper Aug 18, 2017, 11:46 PM

#

@tall grove i would tell the client to ask the server if this door can be opened (rpc), and then have a bDoorOpened (onrep) so all other clients know the door has opened

#

there is actually a content example that describes the problems and solutions for this exact problem, they use a chest for example

#

Content Examples under the Learn button in the epic games launcher

#

then just check out the Network_Features map in there

tall grove Aug 18, 2017, 11:54 PM

#

@twin juniper Thanks i just attached that video , i will try to do again

#

Downloading Content examples , thanks

tall grove Aug 19, 2017, 12:20 AM

#

Sorry but i dont understand why this is not working for me

#

📎 unknown.png

#

📎 unknown.png

#

📎 unknown.png

#

are this ok?

twin juniper Aug 19, 2017, 1:14 AM

#

Does bUseNetOwnerRelevancy also mean that the owners NetUpdateFrequency and MinNetUpdateFrequency will be used?

#

no

#

it means it will use the owners relevancy

#

Yeah I'm just making sure the NetUpdateRate stays the same, thanks

sharp wasp Aug 19, 2017, 1:22 AM

#

Are there any good examples on how to handle Multiplayer inventories properly?

civic belfry Aug 19, 2017, 1:56 AM

#

anyone ever run into a bug where a BP's root static mesh will spawn, but nothing under it in the BP? It shows all of the elements fine when dedicated server is disabled. when I enable dedicated server, only the root componant shows up

#

frustrating!

#

thinking I might have to make a video to demonstrate

twin juniper Aug 19, 2017, 1:57 AM

#

hey uh

atomic holly Aug 19, 2017, 2:32 AM

#

im having an issue, im running my game in the editor with 1-2 players and with run as dedicated server checked and everything works fine but when i build the game and the dedicated server i get warnings "access none" in the server log. Any ideas why this is happening, im thinking its a bug with 4.17?

civic belfry Aug 19, 2017, 2:36 AM

#

I see accessed none when I PIE with dedicated server on 4.16 too. haven't tried building and playing yet though

#

you using the shooter game template?

#

see it in my output log I mean

atomic holly Aug 19, 2017, 2:37 AM

#

yeah the issue is i dont get any errors or warning in the editor and the game works, but when built the dedicated server throws warnings

#

i started with the shooter game template yes

civic belfry Aug 19, 2017, 2:38 AM

#

if you search your output log when you PIE, I feel like you're going to see it buried in their somewhare

#

not sure though, still getting a grip on the project

atomic holly Aug 19, 2017, 2:38 AM

#

but the features work in the editor

#

and they dont in the build

civic belfry Aug 19, 2017, 2:39 AM

#

hmm, not sure. I'm going to try to build this evening just to see what I'm in for. I haven't modified anything that should prevent it from working so I'll let you know what happens!

atomic holly Aug 19, 2017, 2:39 AM

#

just dont update to 4.17

civic belfry Aug 19, 2017, 2:39 AM

#

lol

#

ahh I see something, our issues might be different. mine's referencing something I've added to the template

#

PIE:Error: Error Blueprint Runtime Error: Accessed None trying to read property K2Node_Event_DamageCauser from function: 'ExecuteUbergraph_BP_DENT_MASTER' from node: DENT DM Server Generic Damage in graph: EventGraph in object: BP_DENT_MASTER with description: Accessed None trying to read property K2Node_Event_DamageCauser
LogScript:Warning: Accessed None trying to read property K2Node_Event_DamageCauser

#

DENT destruction system

#

I'll still build though, just for curiosity

atomic holly Aug 19, 2017, 2:41 AM

#

you understand what that error means yeah?

civic belfry Aug 19, 2017, 2:41 AM

#

yeah, means I need to do more than just install the plugin and run it lol

#

I just added it last night

atomic holly Aug 19, 2017, 2:42 AM

#

lol

#

im getting this error with 4.17

#

as well

#

https://issues.unrealengine.com/issue/UE-47991

civic belfry Aug 19, 2017, 2:44 AM

#

ouch, definitely going to hold off on upgrading then. I'm restricted to whatever nvidia gets working with their volumetric lighting build for now anyway

#

always itching to upgrade though lol

atomic holly Aug 19, 2017, 2:45 AM

#

so was i, updated worked on the project for over a week, then built the game, but when i try and run it the game crashes on launch....

#

cant revernt to 4.16 now and cant build my game

civic belfry Aug 19, 2017, 2:51 AM

#

if you run it from visual studio does it give you any log info?

#

I'm guessing wild shit lol

inner iris Aug 19, 2017, 11:29 AM

#

Damn just updated to source 4.17 a few days ago... will test a build today on the server, hopefully won't get any errors

modern dome Aug 19, 2017, 12:53 PM

#

void AARPG_GameStateBase::GetLifetimeReplicatedProps(TArray<FLifetimeProperty> &OutLifetimeProps) const
{
    Super::GetLifetimeReplicatedProps(OutLifetimeProps);
    DOREPLIFETIME(AARPG_GameStateBase, partyPawns);
}```

I get these errors:

```cpp(12) : error C2275: 'AARPG_GameStateBase': illegal use of this type as an expression
cpp(12) : error C3861: 'DOREPLIFETIME': identifier not found

Are the docs not up to date again?

thin stratus Aug 19, 2017, 1:00 PM

#

Seems like you didn't include everything

tropic moat Aug 19, 2017, 1:02 PM

#

for DOREPLIFETIME you need UnrealNetwork.h

modern dome Aug 19, 2017, 1:05 PM

#

Ah, thanks. Good to know it isn't mentioned anywhere 😄

modern dome Aug 19, 2017, 1:22 PM

#

When is the GameState Object spawned?
I thought it is spawned within AGameModeBase::InitGame(), but it is null within the InitGame of my class (Super:: call at the beginning tho)

#

📎 unknown.png

#

if(state) is not executed, too.

tropic moat Aug 19, 2017, 1:26 PM

#

AGameModeBase::PreInitializeComponents()

#

you have GameState = GetWorld()->SpawnActor<AGameStateBase>(GameStateClass, SpawnInfo)

modern dome Aug 19, 2017, 1:27 PM

#

to initialize parameters and spawn its helper classes.

#

no definition of "helper class" of course

#

But thanks nonetheless.

brittle sinew Aug 19, 2017, 1:35 PM

#

Read the next line down in the comment

#

That might tell you the issue :p

modern dome Aug 19, 2017, 1:37 PM

#

@brittle sinew No one said GameState gets spawned in PreInitializeComponents

#

not to mention that GameState is not a Component

brittle sinew Aug 19, 2017, 1:37 PM

#

Well, @tropic moat just did

modern dome Aug 19, 2017, 1:38 PM

#

yeah, but it's not in the Docs

brittle sinew Aug 19, 2017, 1:39 PM

#

The source is your best resource 😃

modern dome Aug 19, 2017, 1:39 PM

#

I don't wanna look up the source everytime I want to do something.

jolly siren Aug 19, 2017, 1:40 PM

#

lol

tropic moat Aug 19, 2017, 1:40 PM

#

what

brittle sinew Aug 19, 2017, 1:40 PM

#

Would you rather read the source than run into issues like this? Hehe

#

I agree you probably shouldn't have to look at the source for everything, but me agreeing doesn't change anything 😄

tropic moat Aug 19, 2017, 1:41 PM

#

like @brittle sinew said, source is your best resource, you should read it

brittle sinew Aug 19, 2017, 1:41 PM

#

The docs are the way they are, that's just the reality

tropic moat Aug 19, 2017, 1:42 PM

#

or at least learn how to look up things quickly, i didn't know where the game state is spawned

#

just looked it up

modern dome Aug 19, 2017, 1:45 PM

#

A cleaner API + Docs would help aswell 😛

brittle sinew Aug 19, 2017, 1:48 PM

#

Sure, I agree

#

But again, so what? :p

#

I'm not saying it's ideal, I'm just saying it's your best bet of understanding how things work in the current UE4 ecosystem

#

Even if the docs are perfect though, seeing exactly what a function does is a totally different realm of seeing what's going on

#

Not just what the function does, but how it does it

modern dome Aug 19, 2017, 1:52 PM

#

@brittle sinew Of course you are right.
But when InitGame says it "spawns it's helper classes", what would you expect?

#

It's the same problem I encounter way too often with UE:
The Order of Initialization / Spawning is unpredictable when you first touch the classes.

brittle sinew Aug 19, 2017, 1:59 PM

#

Well, personally I wouldn't leave it to expecting or predicting, going to the source of a function is one shortcut...I'm not trying to argue the docs are great and can't be improved, I'm just being realistic

#

The source is available for you right there, and I think if you learn to take advantage of that you'll be more productive

#

If you look at something like Unity or the win SDK the docs are really good, but you don't have the source, so they kinda really have to be 😄

modern dome Aug 19, 2017, 3:31 PM

#

Uhm, guys? Related to my problem from yesterday (Pawns not moving when touching a special actor):
It looks like the NavMesh disappears after a ServerTravel

#

Before ServerTravel (Started with PIE here)

📎 ScreenShot00000.png

#

After ServerTravel

📎 ScreenShot00001.png

#

Ok, it looks like PIE doesn't like travelling at all. It works in Standalone

mossy saddle Aug 19, 2017, 5:58 PM

#

I've got a basic LAN session multiplayer working in the 3rd person template. How do I get it to work over the internet? Should I use the Steam online subsystem for this?

timid pendant Aug 19, 2017, 6:17 PM

#

@mossy saddle You can either use the steam subsystem or the NULL subsystem to customize yourself.

mossy saddle Aug 19, 2017, 6:18 PM

#

Customize the NULL subsystem?

#

And is the Steam subsystem freely available for anyone?

tall grove Aug 19, 2017, 6:51 PM

#

Steam is freely

trail dragon Aug 19, 2017, 7:18 PM

#

You must be on Steam to use the Steam subsystem

#

If you aren't there, you will need to modify the NULL subsystem to work across the internet or you will need to write your own Subsystem

mossy saddle Aug 19, 2017, 8:14 PM

#

Alright, thanks for the help!

tall grove Aug 19, 2017, 11:11 PM

#

How can i do for clients replicate thing like open doors ? i tried with Onrep function but server dont noticed about this

rare cloud Aug 19, 2017, 11:32 PM

#

@tall grove, if you want to send information from client (client -> server) you must use RPC

#

standard replication and so OnRep, is design to replicate only from server to client

tall grove Aug 19, 2017, 11:36 PM

#

@rare cloud DOC says " If it's invoked from a client, with a target that the client owns, it will be replicated to and run on the server. "Run on Server" events are the primary method for clients to send data to the server." but my client doesnt own door or server map stuff

rare cloud Aug 19, 2017, 11:38 PM

#

depend of your game

#

but the easiest integration will be to use an Interface that you call IInteractableActorInterface

cloud ledge Aug 19, 2017, 11:38 PM

#

In our game, doors are synced by their position & target position

#

So the door component just has those two replicating variables, plus a custom logic that syncs visible position based on server reported position & target position

#

Since the doors have some physics

rare cloud Aug 19, 2017, 11:40 PM

#

when character input the key, you call an RPC to server, server make a raycast, if an actor is hitted, get it and check if it's a IInteractableActorInterface, if yes call your interact function

#

and don't forget to use an RPC

#

to update the change to all connected clients

#

or

#

use a bool for the state of your door inside your actor

#

replicate it to all

#

and simply set it on server side

#

the idea is to be more generic and work for more than door

tall grove Aug 20, 2017, 12:43 AM

#

sorry i missunderstanded . I have a interface Interact , the problem is that RPC client to server doesnt work cause client dont have ownership about stuff map

#

maybe , are you saying to have interact rpc on player character instead map stuff.... i gona try

fossil spoke Aug 20, 2017, 12:50 AM

#

@tall grove Whats the problem mate?

tall grove Aug 20, 2017, 12:52 AM

#

I dont understand how to do clients notice other clients that door is opening or things like that

fossil spoke Aug 20, 2017, 12:53 AM

#

Have you checked out Epics tutorials on Replication?

tall grove Aug 20, 2017, 12:53 AM

#

yes

fossil spoke Aug 20, 2017, 12:53 AM

#

What part are you not understanding?

tall grove Aug 20, 2017, 12:53 AM

#

https://www.youtube.com/watch?v=wutqpyDKnCQ&index=3&list=PLZlv_N0_O1gYwhBTjNLSFPRiBpwe5sTwc

YouTube

Unreal Engine

3 - Function Replication

This video shows you when to use function replication versus variable replication and discusses the concept of reliable versus unreliable function calls in B...

▶ Play video

#

why RPC on server doesnt fire

#

if client interact with door , and door summon rpc on server , this flow doesnt fire

fossil spoke Aug 20, 2017, 12:56 AM

#

So the general idea is that Clients tell the Server when they want to do something (such as "Open Door") and then the Server performs that operation and then tells every other Client about it.

tall grove Aug 20, 2017, 12:57 AM

#

soo all RPCs should be on Player controller or derivated classes?

fossil spoke Aug 20, 2017, 12:59 AM

#

Not necessarily. You can only call an RPC from an Actor that has an NetOwningConnection, the PlayerController and PlayerCharacter are examples of Actors that have an NetOwningConnection

#

I would put the RPC on the PlayerController though, like you suggested.

#

Your Door also needs to be marked for Replication

tall grove Aug 20, 2017, 1:00 AM

#

Thanks , its marked

fossil spoke Aug 20, 2017, 1:00 AM

#

📎 Capture.PNG

tall grove Aug 20, 2017, 1:00 AM

#

i will try again

fossil spoke Aug 20, 2017, 1:01 AM

#

bReplicateMovement should also be checked if your attempting to move the Door as well.

tall grove Aug 20, 2017, 1:01 AM

#

is not marked

#

oh MY GOD !!!!!!! WORKS

#

Thanks a lot @fossil spoke @rare cloud @cloud ledge

#

PD: actors reference can change form servers and clients?

fossil spoke Aug 20, 2017, 1:14 AM

#

No worries.

#

Good luck!

worthy wasp Aug 20, 2017, 1:44 AM

#

I'm activating/deactivating a UParticleComponent on my character class properly - as with any functional replication means.... i'm trying to get the particle that i'm using on this guy replicated to network clients.... by means of Local->Server->Multicast. I cannot see the particle effect on networked clients - i've set the component to replicate... still nothing. I DO have an array variable, that i'm switching out the components particle system its using - do you think i need to have that replicated too?

Local-Activates/Deactivates the Component, runs server
Server-Runs Multicast
Multicast - Activates/Deactivates the Component

#

ok i didnt notice this till now - i'm getting a "No Owning Connection" warning preceding this chain - this chain is firing off an AnimNotify in my ABP.....

fossil spoke Aug 20, 2017, 1:53 AM

#

You probably need to send the RPC through an proxy that has an net owning connection, such as the PlayerCharacter, i explained this above earlier.

#

Let me clarify, on the Client side you can only RPC to the Server with an Actor that has an NetOwningConnection.

#

IE: PlayerController, PlayerCharacter

#

@worthy wasp

worthy wasp Aug 20, 2017, 1:55 AM

#

ok to clarify this Devils - i'm using an animnotify - which is coming from the player character's ABP class..... ownership shouldnt even be an issue at this point

#

TryGetPawnOwner->Cast(CharacterCLass)->StoreAsVariable (this is in ANIMBP)

#

OnAnimNotify()->CharVariable->RunFunction

fossil spoke Aug 20, 2017, 1:56 AM

#

Is RunFunction the RPC to the Server?

worthy wasp Aug 20, 2017, 1:57 AM

#

RunFunction is a local function in the character class - described above

#

i've passed appropriate args through the RPC chain - everything LOOKS to be good (passing args wise)

#

i cant get hte VFX to display 😦

#

on NETWORKED clients that is

fossil spoke Aug 20, 2017, 1:58 AM

#

The netowningconnection issue is the problem

worthy wasp Aug 20, 2017, 1:58 AM

#

it happens locally no problem

#

i agree

#

but how to fix it - i dont understand

fossil spoke Aug 20, 2017, 1:59 AM

#

I said that you need to call the RPC that its complaining about on an Actor that has an NetOwningConnection.

#

Im not 100% sure but i doubt that an AnimBP has NetOwnership

#

What Actor does the RPC to the Server exist on?

worthy wasp Aug 20, 2017, 2:00 AM

#

http://puu.sh/xexzO/2243e1d479.jpg

#

ok hold off on that screenshot there

#

my Character class to answer your question

fossil spoke Aug 20, 2017, 2:01 AM

#

Can you paste the actual NetOwningConnection error, it should tell you which RPC is not being fired.

worthy wasp Aug 20, 2017, 2:02 AM

#

http://puu.sh/xexFE/da6c835424.jpg

#

the class that is havivn the AnimNotify call the TurnOnQDevice() - is the same class that is spawning the NETOWNERSHIP error

#

the blue arrows indicate the RPC that will be ignored

#

now....

#

i couldnt post this before because i was answering your question

#

when i interject IsLocallyControlled->Branch().....

#

i dont get ht error

#

it flies through all the code

#

HOWEVER

#

it still doesnt produce the VFX

#

the TurnOnQBeam is a C++ function that simply Activates/Deactivates on the boolean arg passed

#

it is a local function - without RPC - and due to the fact that i'm running this from RPC - it should be ran as server/not approppriately

fossil spoke Aug 20, 2017, 2:08 AM

#

LogNet:Warning: UIpNetDriver::ProcesRemoteFunction: No owning connection for actor BP_AK47_HS_C_0. Function Test will not be processed.

#

Thats the error you get yes?

worthy wasp Aug 20, 2017, 2:09 AM

#

yes

fossil spoke Aug 20, 2017, 2:09 AM

#

I find it hard to believe that your Character is actually throwing that error.

#

Can you post yours please.

worthy wasp Aug 20, 2017, 2:11 AM

#

LogNet:Warning: UIpNetDriver::ProcesRemoteFunction: No owning connection for actor BONUS_3PCharacter_Child_C_1. Function Server_TurnOnQDevice will not be processed.

brittle sinew Aug 20, 2017, 2:12 AM

#

Are you spawning your pawn manually?

fossil spoke Aug 20, 2017, 2:12 AM

#

Was about to ask that.

brittle sinew Aug 20, 2017, 2:12 AM

#

Yeah, if they're spawning their pawn manually they'd need to set the owner to the correct controller

#

I didn't actually look back through the whole log closely...you know that the AnimBP notifies fire on all clients, right? @worthy wasp

#

I see you're using the "Is locally controlled" which would get around that, but if you're still getting that warning it's most likely a basic ownership issue

lament kettle Aug 20, 2017, 3:27 AM

#

Do i do stuff within the character or the controller?
ex. pressing the action key to pick up the item.
does the item get attempted to picked up in the character or controller?

fossil spoke Aug 20, 2017, 4:01 AM

#

@lament kettle You can handle it however you like.

lament kettle Aug 20, 2017, 4:01 AM

#

But pawns/characters are rep'd to other clients

#

so more buffer

#

but controllers are not...

#

so wouldn't that mean less data being sent to players?

fossil spoke Aug 20, 2017, 4:03 AM

#

You need to be smart about what you want other Clients to know for sure. If for example you were picking up an Weapon, thats kind of something you want other Clients to know about.

#

Eitherway, if you press an button to pick something up, you still need to tell the Server about it.

#

For example if it was something like Selling an item in your Inventory for Gold.

#

Other players dont really want to or need to know what you sold or what you got for it.

#

But the Server needs to know that.

#

So however you manage it, there is still information that needs to be passed around.

#

Being smart about what gets passed around and when is the important part.

lament kettle Aug 20, 2017, 4:05 AM

#

Hmmm, I think.. I'll leave things in the character/pawn unless it becomes necessary for the controller.

fossil spoke Aug 20, 2017, 4:07 AM

#

It might even come down to an design issue for you. Perhaps you can change Characters during the game, maybe only one type of Character can pickup Items, so it wouldnt make sense for that type of functionality to be inside the PlayerController where it would be wasted. Keeping that functionality on the Character that can pickup items would make more sense.

#

But again, there is nothing stopping you doing it how you please.

lament kettle Aug 20, 2017, 4:07 AM

#

I may have classes...

#

So i think it would make more sense to keep things within the character...

#

I'll probably clean up the inputs into the PC later...

#

when the game needs polishing

trail dragon Aug 20, 2017, 6:25 AM

#

How do I check if a player controller is the host?

#

Have a UI menu where I want to only show an option if the player is the host (ie: a settings menu)

warm pagoda Aug 20, 2017, 6:26 AM

#

Host in what sense?

#

As in, they're running the server and client in one process?

trail dragon Aug 20, 2017, 6:26 AM

#

Yeah, that they are a listen server

#

Is it just Has Authority?

warm pagoda Aug 20, 2017, 6:27 AM

#

That might do coupled with checking if you're on the server.

#

ENetMode::NM_ListenServer

#

If it's UI though, you could just check for running on a listen server and be done with it, no?

trail dragon Aug 20, 2017, 6:28 AM

#

I guess, but Has Authority is already in BP and Net Mode is not :p

#

There's "Is Server" too, "Returns whether the world this object is in is the host"

#

Sounds uh, like what I want

trail dragon Aug 20, 2017, 7:20 AM

#

@warm pagoda you're right btw, the IsServer node just returns World->GetNetMode() != NM_Client

warm pagoda Aug 20, 2017, 7:20 AM

#

👍

#

Yay, more mixing terminology between BP and C++

#

What could go wrong...

#

Well, not so much terminology, but BP API equivalents not being obviously related to C++ API

trail dragon Aug 20, 2017, 7:32 AM

#

Yeah, thank goodness for "Find in Code" orw hatever

grizzled summit Aug 20, 2017, 1:01 PM

#

Is here someone experienced with the usage of beacons?

thin stratus Aug 20, 2017, 1:02 PM

#

@rough iron

#

No idea how much time he has

grizzled summit Aug 20, 2017, 1:04 PM

#

Only need a few small hints to make it work, maybe he contacts me next time hes online or maybe answers here 🙂

pallid mesa Aug 20, 2017, 4:56 PM

#

question, if im in a UActorComponent, for replication i would use this, right? void UShooterWeapon_FiringComponent::StartFire() { if (GetOwnerRole() < ROLE_Authority) { ServerStartFire(); } ... }

#

GetOwnerRole()

sterile pebble Aug 20, 2017, 5:15 PM

#

@pallid mesa, yep. I'm not sure if GetOwnerRole() exists, but you are on the right way

pallid mesa Aug 20, 2017, 5:20 PM

#

it does

pallid mesa Aug 20, 2017, 5:38 PM

#

if you are not sure if it exists why would you tell me that im right? xD @sterile pebble

#

i want to know the good way about uactorcomponents replication

sterile pebble Aug 20, 2017, 5:39 PM

#

this is right way to do it

#

you check component network role and in case of non-authority you send server RPC

#

in other case you do what you want

pallid mesa Aug 20, 2017, 5:40 PM

#

well if there is something better than do this every time i want to check role i'm up to it ENetRole UActorComponent::GetOwnerRole() const { AActor* MyOwner = GetOwner(); return (MyOwner ? MyOwner->Role.GetValue() : ROLE_None); }

#

yeah i know networking on actors, but im virgin on uactorcomponent replication

sterile pebble Aug 20, 2017, 5:41 PM

#

its same, basically

pallid mesa Aug 20, 2017, 5:41 PM

#

maybe there is a better standarised way

sterile pebble Aug 20, 2017, 5:43 PM

#

I have made weapon system with components in released game, where I used simillar approach. It worked without any problems in terms of performance or player feelings.

pallid mesa Aug 20, 2017, 5:47 PM

#

well im all ears

calm zenith Aug 20, 2017, 6:23 PM

#

anybody knows if there's c++ steam integration tutorials apart from https://wiki.unrealengine.com/4_13%2B_Network_Guide#Steam ?

4 13+ Network Guide

brittle sinew Aug 20, 2017, 6:58 PM

#

There's this if you haven't seen it, it shows how to link the SDK https://wiki.unrealengine.com/Steam,_Using_the_Steam_SDK_During_Development

Steam, Using the Steam SDK During Development

#

If that's not what you're going for, what's the issue?

calm zenith Aug 20, 2017, 7:24 PM

#

well main resources with full on steam integration I found were mainly blueprint oriented, including all menus and so forth

#

having something to gnaw on based on c++ would make a bit more sense

#

at least how it integrates with unreal

sharp wasp Aug 20, 2017, 7:28 PM

#

Is there any good example for listing dedicated servers via steam?

calm zenith Aug 20, 2017, 7:31 PM

#

@brittle sinew I seem to have found some leads I might be able to grab onto, thanks

tropic moat Aug 20, 2017, 8:15 PM

#

i just realized i didn't read the comment for a Ping variable and was using it wrong for days ...
/** Replicated compressed ping for this player (holds ping in msec divided by 4) */
: (

#

there is ExactPing, that stores correct value

trail dragon Aug 20, 2017, 9:30 PM

#

I'm having a brain fart, by default the Player Controller is the only time a client can call a function on a server (correctly) yeah? So if I want to do something I have an object tell my PC to run a function (which is "Runs on Server") and then that will get run on the server and thus changes can be propegated to other clients?

tropic moat Aug 20, 2017, 9:31 PM

#

Server RPC should work on any actor that is 'owned' by PlayerController

#

but you can just use a PlayerController

#

how do you want to propagate changes to all clients ? replication ?

trail dragon Aug 20, 2017, 9:35 PM

#

@tropic moat short version: Player presses a key to swap between which pawn he controlls. GameMode created both pawns and keeps track of which PC they belong to.

#

So PC (client) -> PC (run on server) -> GetAuthGameMode()->RunSwapFunction

#

I marked the swap function as Server/Reliable/WithValidation, but realized that there's no where for it to... replicate to hah

tropic moat Aug 20, 2017, 9:37 PM

#

you should be able to call RPC on a character possessed by a PC

#

is that swap function NetMulticast ?

trail dragon Aug 20, 2017, 9:39 PM

#

@tropic moat it doesn't matter, the GameMode only exists on the server... so there's no where for the function to be replicated to.

#

The function just calls Posess anyways and that is already replicated so

tropic moat Aug 20, 2017, 9:39 PM

#

ah

dark kernel Aug 20, 2017, 9:39 PM

#

heya. so i'm 100% new to multiplayer stuff and I'm looking for where in the Third Person demo project the blueprint info is that spawns the player that connects as simply dragging a second playerstart into the level doesn't seem to do it.

tropic moat Aug 20, 2017, 9:39 PM

#

right, i often forget that : D

trail dragon Aug 20, 2017, 9:39 PM

#

@dark kernel it's a GameMode function

#

Probably a "PostLogin" event?

dark kernel Aug 20, 2017, 9:40 PM

#

the ThirdPersonGameMode BP is empty. maybe I need to look in the C++ project instead?

trail dragon Aug 20, 2017, 9:41 PM

#

It's probably in the default C++ class yes

dark kernel Aug 20, 2017, 9:41 PM

#

ah ok. thanks

trail dragon Aug 20, 2017, 9:41 PM

#

What exactly is your problem/goal here

dark kernel Aug 20, 2017, 9:41 PM

#

Rigth now, I'm just trying to get it so I can spawn in a second player into my own project.

trail dragon Aug 20, 2017, 9:41 PM

#

local multiplayer or online/lan

dark kernel Aug 20, 2017, 9:41 PM

#

lan

trail dragon Aug 20, 2017, 9:42 PM

#

If you just want to test with two clients connected to each other, hit the dropdown arrow next to "Play" and at the bottom set it to two

#

When you play it'll start two instances of your game and connect them to each other

dark kernel Aug 20, 2017, 9:43 PM

#

right. the second client isn't spawning a pawn which is where i got confused. and went digging in the TP demo proejct

trail dragon Aug 20, 2017, 9:43 PM

#

What do you see on the second instance's screen?

dark kernel Aug 20, 2017, 9:44 PM

#

looks like a basic default pawn. No controls or anything. The first instance spawns a player fine

trail dragon Aug 20, 2017, 9:46 PM

#

The game, by default, should spawn everyone who connects as the default pawn class set in the game mode unless you've changed code

dark kernel Aug 20, 2017, 9:47 PM

#

maybe i have something goofy there then. i'll check

#

huh it actually is spawning in the pawn, but no controller. I think I know where the problem is now. Thank you 😃

trail dragon Aug 20, 2017, 9:50 PM

#

It should spawn controllers too...

#

The server should have all player controllers, clients only have their own player controller

dark kernel Aug 20, 2017, 9:50 PM

#

not if i don't have one set >.>

#

i made a dumb and put my input in the pawn BP, not a player controller bp

trail dragon Aug 20, 2017, 9:54 PM

#

You can put input in the pawn BPs as long as you use Axis and Actions from the Input Manager and not hardcoded keyboard/button values (iirc?)

dark kernel Aug 20, 2017, 9:54 PM

#

hm

#

the second pawn definite;ly appears as if it isn't being possessed

#

yeah only one player controller is being spawned

trail dragon Aug 20, 2017, 10:04 PM

#

on the server or the client @dark kernel

dark kernel Aug 20, 2017, 10:04 PM

#

Which will be the server? The one in the editor, and the extra window the client?

#

assuming i set my clients to 2 under the play button

trail dragon Aug 20, 2017, 10:05 PM

#

It depends on your advanced settings, by default I think the editor is "listen server" (which is server and client together)

dark kernel Aug 20, 2017, 10:06 PM

#

yeah then it'd be the second window, the non-server

trail dragon Aug 20, 2017, 10:11 PM

#

Clients will only ever have one PlayerController on their machine (in multiplayer, in what you're doing)

#

PC's are not replicated to other clients, just to the server

dark kernel Aug 20, 2017, 10:11 PM

#

ah ok. so i guess that isn't the problem either oof.

#

guess i'll go fiddle some more

trail dragon Aug 20, 2017, 10:12 PM

#

Can you post a picture of your second instance + your editor view with the World Outliner showing as much as possible?

dark kernel Aug 20, 2017, 10:12 PM

#

yeah one sec

#

Editor View

📎 unknown.png

#

Client View

📎 unknown.png

trail dragon Aug 20, 2017, 10:15 PM

#

Well it does look like they are connected, there are two players spawned and two cameras which make me think it is working as expected

#

Are you sure you're not just moving both of them at the same rate at the same time so they stay ontop of each other?

dark kernel Aug 20, 2017, 10:16 PM

#

if you look in the first picture, the other one is spawned directlty in front of it. it definitely doesn't move when i move the editor version

#

I can move around it just fine with the editor version

📎 unknown.png

trail dragon Aug 20, 2017, 10:17 PM

#

Is your pawn set to replicate movement

dark kernel Aug 20, 2017, 10:18 PM

#

yeah

trail dragon Aug 20, 2017, 10:18 PM

#

🤔 Are you suuuure

dark kernel Aug 20, 2017, 10:18 PM

#

i mean, the editor could be lying to me, lol but it's checked

trail dragon Aug 20, 2017, 10:19 PM

#

So you have both Replicates and Replicates Movement checked? Because that should make at least the server's movements show up on the client...

dark kernel Aug 20, 2017, 10:19 PM

#

yeah. I genuinely don't think the pawn is being possessed on the client.

trail dragon Aug 20, 2017, 10:21 PM

#

If you move around your server pawn, do you see those changes on your client copy

dark kernel Aug 20, 2017, 10:25 PM

#

so i messed around. the client is spawning the view at exactly 0,0,0 in the world, which is nowhere near the player start point. It's spawning the second ship (the one you can see from the editor) at the player start point.

trail dragon Aug 20, 2017, 10:25 PM

#

Did you mess with how cameras work for your pawns

dark kernel Aug 20, 2017, 10:25 PM

#

i have a simple static camera on the pawn

trail dragon Aug 20, 2017, 10:26 PM

#

I assume your PlayerController has "Find Camera Component when View Target" checked

#

As well as "Auto Manage Active Camera Target"

dark kernel Aug 20, 2017, 10:27 PM

#

i'll look

sweet spire Aug 20, 2017, 10:34 PM

#

just because replicate movement is checked does not mean its gonna replicate

#

just to clarify

dark kernel Aug 20, 2017, 10:35 PM

#

think i'm in over my head here. x.x lol thanks for the help though. gonna have to do more reading

trail dragon Aug 20, 2017, 10:35 PM

#

@sweet spire If you move the actor on the server, that should...?

sweet spire Aug 20, 2017, 10:35 PM

#

well

trail dragon Aug 20, 2017, 10:35 PM

#

Assuming it's relevant/in view

sweet spire Aug 20, 2017, 10:35 PM

#

no

#

If u have the char movement component then yes it will

#

otherwise no it wont

#

it depends on setup

#

u gotta make sure your sending the info too the server

trail dragon Aug 20, 2017, 10:36 PM

#

Like I said, if the pawn moves on the server the position will be replicated to the client if that is checked.

sweet spire Aug 20, 2017, 10:36 PM

#

the only thing that has pre full network setup is the char movement component

#

yeah

#

but if hes not telling the server to move

#

its not gonna replicate

#

been here done that with spaceships around 6 months ago

#

been there(

#

there*

dark kernel Aug 20, 2017, 10:37 PM

#

TIL: Networking/mp is hard man, lol

sweet spire Aug 20, 2017, 10:37 PM

#

u could be a scumbag and cheat it phil

#

but u wont get physics based movement

dark kernel Aug 20, 2017, 10:37 PM

#

but then i owuldn't learn anything 😉

sweet spire Aug 20, 2017, 10:37 PM

#

your in over your head too start with replicating physics movement too start with

#

tldr you moving around will not move the ship on the server

#

You need too actually send the server your movement data

dark kernel Aug 20, 2017, 10:38 PM

#

I'm going to mess around with my third person demo instead I think as that seems simpler

sweet spire Aug 20, 2017, 10:38 PM

#

yeah it is

#

Char movement component handles everything

trail dragon Aug 20, 2017, 10:47 PM

#

In my (VR) game the player is represented by their head's physical location. Their pawn technically has the VR origin as the position of the pawn, however I want it so that when you spawn your head ends up over your spawn point and not your VR origin

#

Obviously the HMD data is client-side only about its position, so I need to send that to the server, ie: via the PlayerController. However, when the first player is spawned they haven't sent the data back to the server yet so it thinks their head is at 0,0,0... is there a smart way to resolve this, or do I have to make everyone a spectator until they send the data the first time?

cyan bane Aug 20, 2017, 11:48 PM

#

When you guys test what would you consider to be reasonable pktlag/pktloss/pktwhatever to use? I've been pktlag=75 with pktloss=1

#

Like in almost any game a player with a ping of 200 wouldn't expect the game to be playable. But 75 should be just fine.

tropic moat Aug 20, 2017, 11:51 PM

#

i'm not sure about correct values myself, but i'm targeting ~120ms ping, to get this i'm using PktLag=50, PktLagVariance=20 on both client and server

cyan bane Aug 20, 2017, 11:53 PM

#

Wait, so if you have PktLag set as 50 on both the clients ping is really 100?

#

Because I thought if you only set PktLag only one then nothing happens

tropic moat Aug 20, 2017, 11:55 PM

#

i just set values for PktLag and observed how the ping is changing, looks like it's more or less sum of PktLag

#

but i'm no expert so don't quote me on this

solemn moat Aug 21, 2017, 12:25 AM

#

For multiplayer on Android, should I write here, or at the mobile category?

sweet spire Aug 21, 2017, 12:47 AM

#

here

lone iron Aug 21, 2017, 1:46 AM

#

what's a sane way to do client authoritative networking? I get the feeling doing GetNetMode() == ENetMode::NM_Client and sending server events isn't the best idea

#

but i'm a little unsure what other test you could use

trail dragon Aug 21, 2017, 2:17 AM

#

@lone iron I don't think you want that, I think the client on a listen server wouldn't be able to move then 😃

#

I did IsLocallyControlled() in my pawn, though maybe it's better to use ROLE?

hasty adder Aug 21, 2017, 6:13 AM

#

Hm

#

So is it true you should try and lower the character net update frequency. And it will keep the location or what

#

Wish there was a video example of how it works. Trying to get fast moving characters to rubber band smooth instead of glitch when they take a random direction change.

rough iron Aug 21, 2017, 8:32 AM

#

@grizzled summit @thin stratus what's up? In short a beacon is just a simple socket for data interaction without creating a real game connection. I got a small guide in the wiki about it. @clever peak published a beacon lobby system on the marketplace following the idea in the wiki.

rough iron Aug 21, 2017, 9:31 AM

#

https://wiki.unrealengine.com/PartyMatchmaking

PartyMatchmaking

fossil spoke Aug 21, 2017, 9:42 AM

#

@rough iron Can really put together an good party 😉

solemn moat Aug 21, 2017, 10:25 AM

#

Is there a video tutorial for a working Android multiplayer blueprint?

#

I'm new to unreal and I want to make a game where everyone can host or join a game in one of my maps

sweet spire Aug 21, 2017, 11:27 AM

#

@solemn moat id start by actually learning basics of networking and ue4 multiplayer, theres not just a video thats going to explain it all too you
and hosting on a mobile device? im not sure if thats such a good idea

#

just so you know its not a case of enable multiplayer and thats it, replication is not so basic

rough iron Aug 21, 2017, 11:29 AM

#

@fossil spoke yeah!

solemn moat Aug 21, 2017, 11:35 AM

#

I was thinking something simple like arrow.io

#

How do these games work?

rough iron Aug 21, 2017, 11:44 AM

#

Hosting on a mobile device is a very bad idea though, mobile internet is extremely intermittent. What you want to do is to build a backend

sweet spire Aug 21, 2017, 11:44 AM

#

im not saying its impossible to host on a mobile device

rough iron Aug 21, 2017, 11:44 AM

#

and communicate with that one

sweet spire Aug 21, 2017, 11:44 AM

#

^

rough iron Aug 21, 2017, 11:44 AM

#

You can of course host on a mobile device but your players will suffer it

sweet spire Aug 21, 2017, 11:44 AM

#

and i cant stress
if your new to unreal engine 4, and dont know the basics of game networking

rough iron Aug 21, 2017, 11:44 AM

#

even for the simplest of interactions

sweet spire Aug 21, 2017, 11:44 AM

#

You cant just pick this up from a video

rough iron Aug 21, 2017, 11:54 AM

#

@solemn moat arrow.io might seam easy to build but their developer is not a small one => http://www.cmcm.com/en-us/

Cheetah Mobile - The world’s leading mobile tools provider

Cheetah Mobile, the world’s leading mobile tools provider, is dedicated to provide a faster, safer and easier mobile experience for its global users.

#

so the effort to build a high-scale mobile game is actually very hard, not to mention to aim to such a thing as your first MP experience

solemn moat Aug 21, 2017, 12:26 PM

#

So where do you think I need to start? I'm interested in Android games with unreal engine

sweet spire Aug 21, 2017, 12:26 PM

#

well you need to learn how to use the engine first

#

then uv got asset production

#

networking understanding

#

multiplayer,

#

if your planning to sell it you need to setup a legal entity, aka a ltd company

#

theres tons too it

#

so take it one step at a time

solemn moat Aug 21, 2017, 12:27 PM

#

So many things I didn't even know 😛

sweet spire Aug 21, 2017, 12:27 PM

#

well yeah

#

some stuff takes like 1mil $ to make

supple bloom Aug 21, 2017, 12:28 PM

#

So many things you'll wish you never had to learn 😛

sweet spire Aug 21, 2017, 12:28 PM

#

its not an easy process lmao

solemn moat Aug 21, 2017, 12:28 PM

#

But I want to learn them! Just don't know where to start

#

If it's an offline Android game, is it easier?

supple bloom Aug 21, 2017, 12:28 PM

#

An offline game is a good milestone I think

sweet spire Aug 21, 2017, 12:29 PM

#

well start by making a single player course

supple bloom Aug 21, 2017, 12:29 PM

#

Get the mechanics down and what makes the game fun

sweet spire Aug 21, 2017, 12:29 PM

#

obstacle course or something

solemn moat Aug 21, 2017, 12:29 PM

#

I have followed some YouTube tutorials

#

I made a survival horror game

#

Third person, first person

#

One sidescroller

sweet spire Aug 21, 2017, 12:30 PM

#

just keep practicing then

solemn moat Aug 21, 2017, 12:30 PM

#

K I'll do that

#

If I make something for pc, can I just pack it for Android and it will work?

sweet spire Aug 21, 2017, 12:30 PM

#

yes and no

#

yes u can

#

but i doubt its gonna work off the bat

#

you gotta test your stuff across multi devices

#

find issues

#

and fix em

solemn moat Aug 21, 2017, 12:31 PM

#

And u test them with emulators on pc, right?

sweet spire Aug 21, 2017, 12:31 PM

#

got no idea

#

I dont do mobile

solemn moat Aug 21, 2017, 12:32 PM

#

Ok thank you for the info. I think I'll keep practicing offline for now

#

I'll let you know how it went 👍

modern dome Aug 21, 2017, 1:20 PM

#

So, I successfully implemented a TimeOfDayUpdater and a TimeOfDayActor.
The Updater is spawned from the GameState and the Actor searches for the Updater before BeginPlay.
My Question is:

#

Should the Updater and the Actors be local (They are only cosmetic) only instead of replicated?

#

Maybe the TimeOfDay should be synced periodically. Can I do something like this?

inner iris Aug 21, 2017, 2:46 PM

#

Is there a way to play a packaged build locally with bots without having to connect to a dedicated server, but keep the logic the same? Right now my game works online and when connecting to another client's listen server but when launching locally, only the client movement works and nothing that involves the server is working (pickups/firing etc). Is there a startup command that'd launch the game / map with the player as a client, as if connecting to a real server online?

lone iron Aug 21, 2017, 2:48 PM

#

@Matt "@LordNed" Hoffman#3445 as far as I know it's the only way to do lag comp in ue4

clever peak Aug 21, 2017, 2:49 PM

#

Online beacons are pretty handy thanks to @rough iron for his wiki, very helpful.

jolly siren Aug 21, 2017, 2:50 PM

#

Is this the marketplace project Moss was referring to?

#

https://www.unrealengine.com/marketplace/steam-beacons

rough iron Aug 21, 2017, 2:57 PM

#

yep that's @clever peak s pack ^^

jolly siren Aug 21, 2017, 3:05 PM

#

awesome 😃

clever peak Aug 21, 2017, 3:13 PM

#

thx

grizzled summit Aug 21, 2017, 6:42 PM

#

@rough iron Thanks for your reply. I was reading here https://docs.unrealengine.com/latest/INT/Gameplay/Networking/OnlineBeacons/ about the beacons. They talk about the TestBeacons (Host + Client). And I was wondering if there is any short guide on how to do first steps with (test)beacons, without having to do it like trial and error
Would appreciate any help 🙂

Online Beacons

Overview of the Online Beacon system

sweet spire Aug 21, 2017, 6:50 PM

#

dam @rough iron thats really nice write up, think of adding some examples?

tall grove Aug 21, 2017, 6:54 PM

#

How can i see why player is kicked from server? im testing and when i connect it sends me to main menu

sweet spire Aug 21, 2017, 6:55 PM

#

Your not connecting then

#

if i remember correctly

#

but i might be wrong

#

things like that happen if you try and load an invalid map

#

or the server connection is lost, u load up default map i think?

#

havent had that issue in months so cant remember off the top of my head

tall grove Aug 21, 2017, 6:56 PM

#

server starts on main menu map , create session on steam and load new map , client equal

rough iron Aug 21, 2017, 6:56 PM

#

@sweet spire yeah that would be nice, time though xD

tall grove Aug 21, 2017, 6:57 PM

#

i think is cause event begin play of blueprint level is not syncronized between both

sweet spire Aug 21, 2017, 6:57 PM

#

@rough iron i can imagine your super busy haha, everyone packed with knowledge is, beacons really intrest me, can u only request server information with them? or can you send it or do anything super fancy like server too server communcation just curious*

rough iron Aug 21, 2017, 7:02 PM

#

It's just a socket, in the wiki I go through the merging of parties which is kind'a server to server

sweet spire Aug 21, 2017, 7:03 PM

#

ooo oki, ima take a proper read i skimmed through it quickly hah

rough iron Aug 21, 2017, 7:03 PM

#

While if you aim to a more backend based mmo game you might want to add a good distributed messaging queue systwm

#

Systwm*

#

Arrrr system

sweet spire Aug 21, 2017, 7:04 PM

#

oh?

#

custom system basically, instead of beacons right?

rough iron Aug 21, 2017, 7:04 PM

#

Like rabbitmq, akka.io or zeromq

sweet spire Aug 21, 2017, 7:04 PM

#

ahh

rough iron Aug 21, 2017, 7:04 PM

#

Yep

sweet spire Aug 21, 2017, 7:05 PM

#

something im going too have to take a look in too

#

iv always been wearly of using outside things, and plugins incase they ever go out of date or break and i cant get them back up and running 😂

rough iron Aug 21, 2017, 7:12 PM

#

Yeah but sometimes it just takes too long to make it all in-house

sweet spire Aug 21, 2017, 7:13 PM

#

Yeah your right thats true

tall grove Aug 21, 2017, 7:49 PM

#

Can someone bring me the strategy to manage when a player character triggers something to interact? Collision should managed only on server or all sides? Reference to pawn on server and clients are the same?

sweet spire Aug 21, 2017, 8:15 PM

#

anything major should be server

#

vfx and non important

#

client

#

thats a decent basis for it i guess?

trail dragon Aug 21, 2017, 8:16 PM

#

@tall grove how familiar with multiplayer concepts are you

tall grove Aug 21, 2017, 8:17 PM

#

this is my second day in multiplayer stuff 😂

trail dragon Aug 21, 2017, 8:18 PM

#

Okay I've got 15 minutes before a meeting, I'll do my best to crash course you

#

I assume you're talking about generic multiplayer fps like games, yeah @tall grove? (like counter strike, not like an mmo)

tall grove Aug 21, 2017, 8:20 PM

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yes

trail dragon Aug 21, 2017, 8:21 PM

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Okay so, multiplayer. The first thing to understand about multiplayer is that is that it is not actually a shared world. Everyone is in their own isolated world and your goal is to give it the apperance of a shared world between all players. What happens on one machine doesn't have to happen on another in exactly the same way (non-important vfx), etc.

tall grove Aug 21, 2017, 8:21 PM

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Yes

trail dragon Aug 21, 2017, 8:22 PM

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Unreal uses a "server client" model. This is fairly typical, which in practice here means that you have a server (who is the "authority") and clients. The clients are all connected to the server, and clients don't connect to each other. (People will argue about what exactly server/client means so I'm just outlining my understanding of Unreal's)

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Clients don't replicate any data to other clients on their own - and everything you change in your game only happens on your client unless you (or the engine) specifically sees that change and propegates it to the other clients.

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So if your character overlaps a trigger that marks them as winning and you tell your finish flag to play an animation, by default, that's only going to happen on the local client - no one else will see that you've won or see that animation.

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That being said - only UObject-derived classes (thus Actors) can be replicated across the network. If an actor is replicated then it means it has the same identifiers on the server and the client. The actor must be spawned on the server for it to be replicated though, so if you spawn an actor on the client (which you can totally do for client-side only effects that other people don't need to see) that won't show up for anyone else.

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So your server spawns an actor, a message is sent to clients and it shows up on their machines. They touch a trigger on the client and the server - they technically point to different instances of the object (again, illusion of shared world, a reference is just a pointer to local memory) but Unreal has made it so that RPC calls will match up with the correct copy on the other end (because the UObject is set to Replicated)

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So yes, a Pawn touches a trigger on the client - you can play effects like particles and sound on touch, but those by default won't necessairly get replicated down to other clients. If the server-side copy of the actor moves into a trigger, the server will send the position to the clients, so they should enter on all client's machines as well, but there's no gurantee that this will happen as the positions might be off - again, illusion of a shared world, not actually the same world.

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I need to run to my meeting, but hopefully that gives you a general idea of what multiplayer actually means, you should probably ask your question again now that you (hopefully) have a better idea

tall grove Aug 21, 2017, 8:29 PM

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Thanks a lot for your Knowledge , you are nice person

trail dragon Aug 21, 2017, 8:31 PM

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"Collision should managed only on server or all sides" <- all sides, but server should be final call in critical situations. The CharacterMovementComponent handles this for you (it's like 10k lines of code...) so hope you're making a game that can use this.
"Reference to pawn on server and clients are the same?" <- effectively, RPC's you call on the reference will match up to the same conceptual one on the other end.

tall grove Aug 21, 2017, 8:32 PM

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Thanks a lot , i will work with this . Good luck on meeting 😃

trail dragon Aug 21, 2017, 8:33 PM

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@tall grove https://docs.unrealengine.com/latest/INT/Gameplay/Networking/ this is for the C++ side, but 90% of it applies to Blueprints as well.

Networking and Multiplayer

Setting up networked games for multiplayer.

tall grove Aug 21, 2017, 8:34 PM

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i Saw exis compendium online and videotutorial of Unreal engine YT.

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are there any usefull stuff about networking?

trail dragon Aug 21, 2017, 8:35 PM

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The networking compendium is a good quick-start, and the one I linked is a good technical version of it, but I don't think either of them teach the concepts of multiplayer/what things actually get sync'd

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So you'll probably have to ask in here about what goal you're trying to accomplish at any given time and we can help advise on the best way to try to make that happen.

tall grove Aug 21, 2017, 8:37 PM

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Thanks a lot again . im really happy about your reply

twin juniper Aug 21, 2017, 9:07 PM

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Hey how do I name splitscreen players the same name as player 1, only with a (1) or a (2) or a (3) after it?

trail dragon Aug 21, 2017, 9:10 PM

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@twin juniper each one should get a PlayerState right? I think you'll have a PlayerController for each , do both of those emit OnPostLogin events?

twin juniper Aug 21, 2017, 9:11 PM

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All have a PlayerState, all have a PlayerController, all print the correct instance number

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They all spawn using OnPostLogin

trail dragon Aug 21, 2017, 9:11 PM

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You might need to map PlayerController -> underlying network connection to see which number they are, but there's no gurantee that they'll connect in the same order so the second local player may not be without the (1)

twin juniper Aug 21, 2017, 9:11 PM

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I am using AdvancedSessions too

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I'm not too concerned about the (1) .. (2) .. (3) being out of order

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😃

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So how do I go about mapping PlayerController and such?

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Some splitscreen games can have multiple splitscreen hosts

trail dragon Aug 21, 2017, 9:12 PM

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Do you know C++

twin juniper Aug 21, 2017, 9:12 PM

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so there could be 2 main players, each having 1-3 splitscreen players too

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I'm doing this just in BP ):

trail dragon Aug 21, 2017, 9:13 PM

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It looks like PlayerState has both UniqueId and PlayerId

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You could see if any of those match for the PC's that come from the same machine.

twin juniper Aug 21, 2017, 9:13 PM

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right

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I'm using PlayerName actually from PlayerState

trail dragon Aug 21, 2017, 9:14 PM

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And they end up with the same exact name yeah?

twin juniper Aug 21, 2017, 9:14 PM

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no, one is my correct name, the other is a few numbers

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I am connected to Steam

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^It's how I want it to be setup though, thru using Steam

trail dragon Aug 21, 2017, 9:15 PM

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So the Steam Subsystem automatically sets the name to your local steam account, you could look up the C++ code for that and modify how that works, but that will require C++ code again

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And probably building the engine :<

twin juniper Aug 21, 2017, 9:16 PM

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😮

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I'm setting the PlayerState's PlayerName to a visible text called "UserName"

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is there anyway before I set it to that "UserName" variable

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I can loop thru some id or name variable...

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which might return "it's the same"

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however many times it returns "the same name" I just add a new INT inside a string of "()"

trail dragon Aug 21, 2017, 9:17 PM

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I mean that's what I was suggesting earlier is possible ways to find which PlayerController/PlayerStates come from the same physical computer

twin juniper Aug 21, 2017, 9:17 PM

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not too sure about all the ID and Name variables I can pull out of Steam stuff and regular

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right

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well, I know they all have different controllers

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GetInstigator of PlayerState?

trail dragon Aug 21, 2017, 9:18 PM

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Instigator is for damage stuff, it'll probalby just report their (differing) PlayerControllers

twin juniper Aug 21, 2017, 9:19 PM

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right oops I read the tooltip lol!

trail dragon Aug 21, 2017, 9:20 PM

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Hmmn here's a different idea. In your GameInstance (since there's only one of those per client), you send a message after you get connected to the server that contains your names

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I bet GetPlayerController(0) returns the one with the proper steam name. Then you can get that name and add (int) after it and send a message from client to server that goes "Hey, these should be our names for these player controllers". Then on the server you set the PlayerState->PlayerName of those PlayerControllers. That should get replicated down to other clients.

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You won't be able to send a message from client->server until OnPostLogin has happened (which only happens on the server) heh

twin juniper Aug 21, 2017, 9:48 PM

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ForLoop the PlayerStates, GetUniqueID from AdvancedSessions plugin, if valid and the one before is valid, -- from the for index and get that player name, just set it

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if not valid, -- one more

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you'll get the base player's name eventually

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I'm sure splitscreen characters spawn all at the same time

trail dragon Aug 21, 2017, 9:52 PM

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GetUniqueID should always be valid and should always be different

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Key word there "Unique" - how are you going to tell that two unique things came from the same computer

twin juniper Aug 21, 2017, 9:57 PM

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it's not for splitscreen unfortunately

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it has an IsValid node, if you test with splitscreen it will always return ..

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uh

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No NetSession ID !!!

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all caps or something similar

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it's from AdvancedSessions plugin

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BPUnique Net Id Structure "type"

trail dragon Aug 21, 2017, 10:01 PM

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Interesting. There's no gurantee of order for PlayerStates, but maybe in practice it is ordered?

twin juniper Aug 21, 2017, 10:05 PM

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the Net Id Structure type can be taken direct from a PlayerState, or on its own from a controller. Both return invalid if it is duplicate

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no Steam user should be in a match twice, Steam is strict about that lol

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well, it prints totally correct

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"ordered PlayerStates"

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no mix-match of (1), (2), (3), etc.

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I think in multiplayer games...too...it forces all players of one machine to join at the same time somehow

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or order them as they come, I think even if another player joins with their own splitscreen, it orders it up just fine with no splitscreen player joining until its host machine joins in with the rest of its players

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something along the lines, I will test juuust a little later

trail dragon Aug 21, 2017, 10:15 PM

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@twin juniper what if two players try to join at the same time

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I'm just saying there's probably not specific code that gurantees that they will always be perfectly in order. Realistically yes you can probably get away with it, but it's not likely guranteed. This means it will probably work, but if you start getting bug reports of people having the wrong names, you'll know what to suspect

twin juniper Aug 21, 2017, 10:52 PM

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well it doesn't actually assign the wrong names. It will assign a new name, the few lengths of digits, in case of any mishap in spawn order

balmy gazelle Aug 22, 2017, 9:51 AM

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Someone knows why the Shooter Game crash if you open 2 instances and try to connect from one to other in local ?

elder ravine Aug 22, 2017, 11:00 AM

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hey guys anyone know why my game is giving me this error when i'm trying to package it?:

PackagingResults:Error: Error Unknown Error

What could this be. I don't find any erros in my game file. Everything compiles just fine.

fossil spoke Aug 22, 2017, 11:32 AM

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Check the Output Log, there will be an Error there somewhere @elder ravine

sharp wasp Aug 22, 2017, 11:39 AM

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Is there anyone here with experience of dedicated servers?

past bear Aug 22, 2017, 11:48 AM

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Minimal

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what's up?

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also, I'm following this through to get to grips with networked movement components:
https://wiki.unrealengine.com/Authoritative_Networked_Character_Movement
All of a sudden, the examples start using 'ExtendedMovement' and I have no idea what's going on - can anyone clarify?

Authoritative Networked Character Movement

sharp wasp Aug 22, 2017, 11:49 AM

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How would i for instance handle having a master server that pings other servers and if they are up at em to a list

past bear Aug 22, 2017, 11:50 AM

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that's actually an entirely unrelated question, lol

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but also, shouldn't your dedicated servers contact the master server?

sharp wasp Aug 22, 2017, 11:51 AM

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Thats what im trying to figure out

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Like how to approach it

past bear Aug 22, 2017, 11:51 AM

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so your dedicated servers should reach out to the master to let the master know they exist

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then the master should periodically check all listed servers to see if they are still online and get an update to their status

sharp wasp Aug 22, 2017, 11:52 AM

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Is this blueprintable or do i need to native code it?

past bear Aug 22, 2017, 11:52 AM

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alternatively (and this is probably better actually), the dedicated servers should just keep pinging every so often with updates

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this is native code work

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when a dedicated server misses say two pings, remove it from the list until it pings again

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seems pretty simple

sharp wasp Aug 22, 2017, 11:55 AM

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Yeah

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Using the -server on the exe runs it as a dedicated server right

past bear Aug 22, 2017, 11:58 AM

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you need to build a dedicated server build

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which may change your non-server builds as I recall

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been a while since I've needed to do it

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but it's a different binary

sharp wasp Aug 22, 2017, 12:00 PM

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Ah

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I see you need to make a source build

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After making one can i import it into ue4 editor and use bp?

fossil spoke Aug 22, 2017, 12:02 PM

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You only need the Source to build the server target, once you compile the Source you dont ever need to touch it again if you dont want to

sharp wasp Aug 22, 2017, 12:07 PM

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@fossil spoke But what if you create a new server event?

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or does it automatically take that over

fossil spoke Aug 22, 2017, 12:08 PM

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You will need to compile the Server alot yes, but the actual Engine Source should only need to be compiled once.

past bear Aug 22, 2017, 12:08 PM

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yup

twin juniper Aug 22, 2017, 12:09 PM

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Hi friends how can I fix 2 bullets instead of 1 bullet while shooting a gun in my project

📎 Replication.png

past bear Aug 22, 2017, 12:09 PM

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call spawn twice (also, this is a #blueprint question)

fossil spoke Aug 22, 2017, 12:09 PM

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There is all kinds of wrong in that pic haha

past bear Aug 22, 2017, 12:09 PM

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yeah, it's a bit confused

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client left mouse and server left mouse?

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server doesn't have a left mouse

twin juniper Aug 22, 2017, 12:11 PM

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I do not know exactly what it might have been

fossil spoke Aug 22, 2017, 12:12 PM

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@twin juniper So when you tell the Server to spawn an Actor, all Clients will also spawn that Actor automatically, so there is no need for you to tell the Clients to do that manually.

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Take out the ClientLeftMouse event and you will be fine.

past bear Aug 22, 2017, 12:13 PM

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ah, now I understand the question

twin juniper Aug 22, 2017, 12:13 PM

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Google Translate 1 m

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Thank you

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It's okay, thank you

📎 calst.jpg

fossil spoke Aug 22, 2017, 12:21 PM

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That HasAuthority node is redundant as well since your calling an RPC to the server so its already Authority

eternal anchor Aug 22, 2017, 1:09 PM

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@sharp wasp ? Question. Do you plan to allow players to host their own dedicated server and then just connect them to our backend, or do you plan to host everything and have something akn to match making ?

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if the first I would let dedicated servers, register with your backend (say some database with their IP, name), when they run for first time

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and then let backend ping servers every so often to check if they are still online

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if not remove them from list

sharp wasp Aug 22, 2017, 1:12 PM

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@eternal anchor Allow users to host a server but let the master server control what servers show up

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so servers can be blacklisted etc

eternal anchor Aug 22, 2017, 1:14 PM

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actually it shouldn't really matter who ping who, I think backed maight be better place because it keeps responsibility of checking servers in one place, but servers can just as well send updateds to your backend

twin juniper Aug 22, 2017, 1:17 PM

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hi

sharp wasp Aug 22, 2017, 1:19 PM

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@twin juniper Hello

cold sparrow Aug 22, 2017, 4:19 PM

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guys, can some one help me to understand what is going on:
I have a character on a server that is controled by keyboard on a client side. I use AddMovementInput function to move the character. Everything works, BUT I see that at the end of move my character is like moving back a little bit. I printed actor's location, and I do see this (look at Y):
LogTemp: X=510.000 Y=1153.795 Z=190.150
LogTemp: X=510.000 Y=1159.226 Z=190.150
LogTemp: X=510.000 Y=1167.106 Z=190.150
LogTemp: X=510.000 Y=1174.199 Z=190.150<---------- stopped moving
LogTemp: X=510.000 Y=1171.250 Z=190.150< ---------why did it go back ?
LogTemp: X=510.000 Y=1174.188 Z=190.150
LogTemp: X=510.000 Y=1172.179 Z=190.150
LogTemp: X=510.000 Y=1172.057 Z=190.150
LogTemp: X=510.000 Y=1172.531 Z=190.150
LogTemp: X=510.000 Y=1171.610 Z=190.150 <---------- final position
LogTemp: X=510.000 Y=1171.610 Z=190.150
LogTemp: X=510.000 Y=1171.610 Z=190.150

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any ideas/remedies/solutions?

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oh, I printed the same log from the server side: postions do not match exactly, looks like on the client side it tries to adjust to what it should be. So in my case client moves a little bit faster than the server. And the end of move is adjustment happening. Any ideas if there is a way to sync positions better?

modern dome Aug 22, 2017, 4:41 PM

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@cold sparrow You can't do much about it. The Hitching is caused by the Prediction of the Client and the correction of the Server

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This is happening because of the CharacterMovementComponent.

cold sparrow Aug 22, 2017, 4:50 PM

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hm... but let's say in Foxhole game (UE4) I did not see such lag, and this is over Internet, while mine is all local PC. I wander, is there alternative solutions?

modern dome Aug 22, 2017, 4:55 PM

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Local? Do you use NetworkSimulation?

cold sparrow Aug 22, 2017, 5:35 PM

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I run it thru the editor: 1 client, 1 dedicated server

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basically, I move server character via client's pawn

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📎 unknown.png

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📎 unknown.png

tall grove Aug 22, 2017, 5:51 PM

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I think you can disable Movement component prediction , but im dont know what will happen

modern dome Aug 22, 2017, 6:10 PM

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You don't have to manually move the character on the server

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Your Character Movement Component will do this automatically @cold sparrow

cold sparrow Aug 22, 2017, 7:19 PM

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@modern dome what do you mean by manually move the character on the server? I give commands from the client to move it on the server, but I want to visually minimize snapping

modern dome Aug 22, 2017, 7:20 PM

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Simply move the Character without a RunOnServer event

cold sparrow Aug 22, 2017, 7:23 PM

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Movement snapping

📎 MovementSnapping.mp4

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hm... move on the client?

modern dome Aug 22, 2017, 7:27 PM

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what speaks against doing this?

📎 unknown.png

thin stratus Aug 22, 2017, 7:29 PM

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If you want to constantly walk towards x axis. Nothing.

cold sparrow Aug 22, 2017, 7:30 PM

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My character exists on the server, I have just a like an empty pawn that has a camera on it and I track server character. But, let's say I change it, so player will own a character, how will other player know that I moved?

thin stratus Aug 22, 2017, 7:30 PM

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What's the problem with having a client own the char?

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That's the default concept

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Possessing a pawn makes the client the owner