#multiplayer | Unreal Source | Page 449

fleet raven Mar 21, 2019, 5:57 PM

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are structs always replicated atomic? as in, if two properties inside a struct property marked as replicated change, the next bunch will contain updates for neither or both of them

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I'm finding conflicting information online, a test seems to show that it's always atomic, and the actual code is hidden so deep in rep layout that I can't find it

rocky badger Mar 21, 2019, 6:56 PM

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Besides the multiplayer compendium and the Udemy tutorials, are there any other resources anyone would recommend to study good cpp multiplayer practices?

thin stratus Mar 21, 2019, 7:25 PM

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You could look at the ShooterGame and the UT source code

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Not sure how "good" that is, but well

plucky horizon Mar 21, 2019, 7:30 PM

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Is there anything stopping me from having a client be authoritative and replicate to the server so that it can replicate to other clients? Or something of that sort?
Cheating isn't really a concern for what I'm developing so I'm wondering if there is something else I'd need to worry about.

thin stratus Mar 21, 2019, 7:33 PM

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UE4's default way of replication is Server->Client

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That's it

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If you want to make the Client Authoritive, you have to use a ServerRPC in a Client owned Actor

plucky horizon Mar 21, 2019, 7:39 PM

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hmm

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could you tell me what the RPC is for?

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replication protocol component?

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found it 😃

solar stirrup Mar 21, 2019, 9:20 PM

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What exactly should I put in a player's state?

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Let's say for an FPS game

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Should health go in there?

oak pond Mar 21, 2019, 9:25 PM

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guys, how is multiplayer testing generally done?

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for something like this for example https://youtu.be/0K8q8ud9uOM

YouTube

ett spel

UE4 Multiplayer Template

▶ Play video

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and how does the whole connection thing work, does it vary across machines?

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as in lag, ping

winged badger Mar 21, 2019, 11:45 PM

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@fleet raven reading NetSerialization.h might point you in the right direction

fleet raven Mar 22, 2019, 12:03 AM

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I like how these methods don't exist

📎 unknown.png

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br_animated_thinking

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so if you have a native struct with a operator==, it won't use it for comparing equality for replication unless you manually flag it as WithIdenticalViaEquality

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reading into the replayout from inside ReplicateActor, it actually looks like it will always send all modified properties at once if replication is triggered

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guess the question then is what happens when this packet is lost and the next one with a different set of modified properties arrives first

jolly siren Mar 22, 2019, 3:09 AM

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Has anyone seen characters prepended to a string when replicating?

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It only looks to happen when the string only has numeric values in it

winged badger Mar 22, 2019, 6:36 AM

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@fleet raven i believe bunches arrive timestamped

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so net driver / data channel should just ignore any replicated properties that it already received with a most recent timestamp

oak pond Mar 22, 2019, 8:00 AM

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but I mean how would I even test it out as in even joining the server

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I know a thing where you can open multiple viewports but I think I heard that doesn't work for steam

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and the thing is a great dev team of three or four guys who made Blood Party had multiplayer in it but even now it's still very laggy based on the distance irl

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you have to be at least in the same country for it to be great connection

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BP was also made in ue4 btw

real yacht Mar 22, 2019, 10:10 AM

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epic services will support sessions right? like steam subsystem?

bitter oriole Mar 22, 2019, 10:12 AM

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In the future yes

real yacht Mar 22, 2019, 10:15 AM

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cool

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that will be at the end of the year

bitter oriole Mar 22, 2019, 10:17 AM

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Yeah

safe marsh Mar 22, 2019, 10:29 AM

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hey, when I select 'run dedicated server' in the launch options, is the editor viewport the dedicated server?

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In game mode beginplay, I open a map if it is a dedicated server, but if I try PIE it opens the map on the client instances also

twin juniper Mar 22, 2019, 10:36 AM

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Hi i have a probleme that when i spawn 2 players that the ui from the other player is displayed on the other player and backwalks also does anyone know how to fix it?

scenic raven Mar 22, 2019, 11:12 AM

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        if (InputComponent)
        {
            UE_LOG(LogTemp, Warning, TEXT("I have an InputComponent"))

            AbilitySystem->BindAbilityActivationToInputComponent(
                InputComponent, FGameplayAbilityInputBinds("ConfirmInput", "CancelInput", "AbilityInput"));
        }
        else
        {
            UE_LOG(LogTemp, Warning, TEXT("I have no InputComponent, I am sorry."))
        }
``` I have been able to narrow it down a little. No crashes anymore, it was the reference to InputComponent, null on the server.  Problem now is that when I run this in the editor and I tick the dedicated server box it doesn't work at all. I expect it to run on the client but instead it doesn't. Any clue?

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This is an x-post from #gameplay-ability-system but maybe it's more related to networking.

keen thorn Mar 22, 2019, 11:52 AM

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Hi guys, I think I found a bug for 4.20 as well as 4.21, wondering if this is a bug or intended. I have this blueprint, which basically set velocity of a ACharacter in the level

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BP

📎 unknown.png

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when i run this on multiplayer PIE, the server version of the character stands still, while the client moves slightly according to the velocity

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My expected behaviour is that they both should either stand still or move

safe marsh Mar 22, 2019, 12:10 PM

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is there any way to set the map in an editor dedicated server

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it loads the currently open map (as the dedicated server map) when I try to change it in the gamemode, it loads an infinite loop

soft relic Mar 22, 2019, 12:35 PM

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Hello guys, I was wondering what would my approach be to creating a game with dedicated servers instead of steam. How woulld I do that and what service should I use?

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Is there something that can allow me to store user data and create session or would that be 2 seperate things?

twin vault Mar 22, 2019, 12:36 PM

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to store data you would create your own thing, or the platform storage if it has one, like steam leaderboards

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for sessions you can use steam, etc. Or create your own matchmaking

soft relic Mar 22, 2019, 12:37 PM

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Would my own thing be something like gamesparks?

safe marsh Mar 22, 2019, 12:37 PM

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well seems like the PIE multiplayer configuration is completely fucked

soft relic Mar 22, 2019, 12:37 PM

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or a hosting database?

twin vault Mar 22, 2019, 12:38 PM

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both are valid options, gamesparks are supposed to make it easier

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but you can create your own database, if you want

soft relic Mar 22, 2019, 12:40 PM

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I've read that using a simple database is bad for lets say getting player position last position whened logged off, xp etc

bitter oriole Mar 22, 2019, 12:40 PM

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@soft relic Steam has nothing to do with dedicated servers or not dedicated

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It's a distribution platform, and it can be a matchmaking / session service

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It does not do hosting

soft relic Mar 22, 2019, 12:41 PM

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What would I choose if I wanted servers that did not have someone be the server host?

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Like steam does

bitter oriole Mar 22, 2019, 12:41 PM

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Steam does not do that.

safe marsh Mar 22, 2019, 12:41 PM

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all I have to type from my entry map is "open [IP]" to connect to my remote server which is on a different map

soft relic Mar 22, 2019, 12:41 PM

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Yes, what should I go for to achieve that?

bitter oriole Mar 22, 2019, 12:41 PM

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Steam does not care or intefere with your multiplayer model

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It is absolutely unrelated

safe marsh Mar 22, 2019, 12:42 PM

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when I try it with a local dedicated one, it wont load

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"open [IP]:[Port]" loads it if it's the same map

soft relic Mar 22, 2019, 12:42 PM

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Instead of steam I mean

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Is there a service I can use?

bitter oriole Mar 22, 2019, 12:42 PM

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Steam is unrelated to game servers

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So there is no instead

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Steam has no servers

soft relic Mar 22, 2019, 12:42 PM

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Yes I got that

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What should I use to have servers though?

safe marsh Mar 22, 2019, 12:43 PM

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use some cloud VPS

twin vault Mar 22, 2019, 12:43 PM

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Google, amazon, etc.

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those are servers

soft relic Mar 22, 2019, 12:44 PM

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Okay cool, I will look into that. And for data what would you guys suggest?

twin vault Mar 22, 2019, 12:44 PM

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depends on how much data you need

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in my case i just did a cloud mysql database, cuz its like 10 bucks and i only needed a couple tables

bitter oriole Mar 22, 2019, 12:45 PM

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Realistically, the first question is how many players you think you will have

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That will define quite a few things

twin vault Mar 22, 2019, 12:45 PM

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if its not something really important, it can be even local saves

soft relic Mar 22, 2019, 12:45 PM

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Im not really developing a project that will need that, just curious for future projects

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Okay, btw does blueprints support getting data from databases?

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or is it a code only?

bitter oriole Mar 22, 2019, 12:47 PM

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Code doesn't support it either

twin vault Mar 22, 2019, 12:47 PM

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i think there are plugins for rest requests in bp (you would still have to code rest requests backend tho :P)

bitter oriole Mar 22, 2019, 12:47 PM

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You'll need to integrate some kind of connection service

soft relic Mar 22, 2019, 12:47 PM

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Okay now it makes sense

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So servers and databases would be 2 seperate things

bitter oriole Mar 22, 2019, 12:48 PM

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Hopefully database singular

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Databases support thousands of connections, few games on Earth have that many game servers

soft relic Mar 22, 2019, 12:50 PM

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correct

safe marsh Mar 22, 2019, 12:57 PM

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ok nvm Found a workaround

soft relic Mar 22, 2019, 12:58 PM

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Is SQL Database Communicator plugin a good one to use?

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I also saw that it is better to hold information in the dedicated server instead of using an online database and php

twin vault Mar 22, 2019, 1:05 PM

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database is for persistent data

soft relic Mar 22, 2019, 1:05 PM

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yeah i mean having the database

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in the dedicated server computer

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instead of using php

twin vault Mar 22, 2019, 1:06 PM

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dedicated server probably wont be a single computer, depending on your game

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you want to have instances booting each time someones want to play on a server

soft relic Mar 22, 2019, 1:07 PM

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Is there a video or a documentation that can show me a proper way to save data online from UE4?

bitter oriole Mar 22, 2019, 1:08 PM

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No

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That's way more advanced that most indies do

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It requires lots of infrastructure and different skills

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If that's what you want to do, you need to build brick by brick until you have something that works

soft relic Mar 22, 2019, 1:10 PM

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So lets say I want to make a game and have a username password etc. How would I do that simply?

bitter oriole Mar 22, 2019, 1:10 PM

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You don't

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That's the simple way

wary wyvern Mar 22, 2019, 1:10 PM

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Guys, what is the size of UObject pointer, replicated over the network?

soft relic Mar 22, 2019, 1:10 PM

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Well I mean the best way

twin vault Mar 22, 2019, 1:11 PM

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the easiest way to do that would be learning Databases > SQL > PaaS > Python > Rest > C++

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and in around 1 year you would make a login system

soft relic Mar 22, 2019, 1:11 PM

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Developing an android add and getting data from firebase is one thing you do in that field

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isnt there something equivalent here?

bitter oriole Mar 22, 2019, 1:12 PM

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What i'm saying is that

Making a game is hard
Making a multiplayer game is very hard
Making a multiplayer game with dedicated servers is very very hard
Making a multiplayer game with dedicated servers with databases and a dedicated login support is basically making a MMO

soft relic Mar 22, 2019, 1:12 PM

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I do know most of those languages

twin vault Mar 22, 2019, 1:12 PM

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if you know python, and SQL, making a rest backend should trivial

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no tutorial needed

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its just a matter of following small steps, to build whats needed for such a system

soft relic Mar 22, 2019, 1:14 PM

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But I can always go with something like gamesparks for a faster solution right?

twin vault Mar 22, 2019, 1:14 PM

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sure, thats why most people go with Steam, no login, no matchmaking, all built in

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(unrelated to your case of servers)

soft relic Mar 22, 2019, 1:14 PM

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I tried making a register/login system with that today and it took me less than 10mins to setup

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Could I use steam and gamesparks to get data from?

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so a player would use steam to connect to each other but gamespark to get all the neccessary data fom

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from*

twin vault Mar 22, 2019, 1:24 PM

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not sure what features gamesparks have but from a quick look yes

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it works with steam and has database access so ye

safe marsh Mar 22, 2019, 1:36 PM

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there is a tutorial online with how to setup a dedicated server build of UE4(you need a source version to build the server executable)

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the hard part is interfacing with a db and serializing the objects so they can be loaded in when the client reconnects

astral gust Mar 22, 2019, 2:09 PM

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Hey :), does anyone know if IOnlineFriendsPtr->SendInvite() is working? In our project the async task returns the error "SendInvite() is not supported".

fleet raven Mar 22, 2019, 2:10 PM

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probably depends on which OSS you're using then

astral gust Mar 22, 2019, 2:10 PM

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We're using Steam

fleet raven Mar 22, 2019, 2:10 PM

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📎 unknown.png

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does not appear to be a thing steam lets you do

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or at least, it is not implemented in unreals OSS

astral gust Mar 22, 2019, 2:11 PM

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Well that sucks.

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Will try one of the other delegates then. A bit strange that AdvancedSessionsPlugin seems to use it too.

bitter oriole Mar 22, 2019, 2:34 PM

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It does not exist in Steam

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Advanced Sessions has a stub for it

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IIRC Steam itself doesn't have the feature

rain coral Mar 22, 2019, 2:41 PM

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Hey. Got an issue where I send a struct to the server. If I print the values as the client before I send it to the server, they're fine. But they're wiped when the server receives them

thin stratus Mar 22, 2019, 2:41 PM

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I'm half sure I already did inviting through steam

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@rain coral C++ or Blueprint?

rain coral Mar 22, 2019, 2:41 PM

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C++

thin stratus Mar 22, 2019, 2:41 PM

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Did you mark them all as UPROPERTY?

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The inner values of the struct

rain coral Mar 22, 2019, 2:42 PM

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Aaah, I think I didn't. Will do

thin stratus Mar 22, 2019, 2:42 PM

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@astral gust You should be able to invite users

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Try

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OnlineSessionInterfaceSteam.cpp Line:1105 (4.20)

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@fleet raven @bitter oriole Also tagging you two, in case you ever get such as question again

astral gust Mar 22, 2019, 2:46 PM

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Thanks for replying Exi. I've been trying to get SendSessionInviteToFriend working for some time now, but it keeps failing

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I'm not sure if there is a way to get the error message using a delegate for example.

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There's barely any documentation on this :/

thin stratus Mar 22, 2019, 2:48 PM

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Well they are printing a lot of Verbose warnings

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have you enabled them for LogOnline?

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Can't remember how you hook into it

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but you have to bind to a delegate somewhere

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Think I did that in the GameInstance

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GameLobbyJoinRequested_t

bitter oriole Mar 22, 2019, 2:50 PM

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Thanks Cedric

thin stratus Mar 22, 2019, 2:50 PM

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Steam Response Delegates DO NOT come in on the GameThread

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So if you receive that and you access the GT (e.g. add a UMG widget) you'll crash

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make sure you move whatever you want to do to the gameThread first

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//Send Blueprints Notification
AsyncTask(ENamedThreads::GameThread, [this, FriendName]() {
    BPEvent_PartyInviteReceived(FriendName);
});

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I sadly have 0 idea where the f*ck I added that to

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But I still had that laying around

void nest Mar 22, 2019, 3:01 PM

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Packaged project (shipping) crashes when using steam_appid.txt file with own appid and also 480. Anyone know why?

error message:

LowLevelFatalError [File:Unknown] [Line: 1178]
FMallocBinned2 Attempt to realloc an unrecognized block 00007FF7EA130000 canary == 0x0 != 0xe3

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when I remove the steam_appid everything works fine

astral gust Mar 22, 2019, 3:02 PM

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Did you check the config here: https://wiki.unrealengine.com/Steam,_Using_the_Steam_SDK_During_Development ?

Steam, Using the Steam SDK During Development

void nest Mar 22, 2019, 3:03 PM

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I'll check it again, but yes I have added the required entries into the defaultengine.ini

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thanks!

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It used to work fine in our previous version of the project (4.18) we migrated to 4.21 and now it gives the crash

astral gust Mar 22, 2019, 3:04 PM

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No problem. It's a bit a vague debug error though. Do all of your maps and BP's compile fine?

void nest Mar 22, 2019, 3:04 PM

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yup, no errors

astral gust Mar 22, 2019, 3:04 PM

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Are you using any plugins like substance by chance?

void nest Mar 22, 2019, 3:05 PM

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we use a houdini plugin

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and advanced sessions

astral gust Mar 22, 2019, 3:12 PM

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So I am aware of two things that could cause it.

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Make sure houdini is recognized and compiled for the project. You can see that by viewing File in the project and see if the Houdini Engine buttons are enabled. You can also see it by building your project from source and looking for the output log messages where the Unreal Build Tool will try to find and link Houdini.

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Then for shipping a build you can try to copy the plugin data into your project's plugin/engine/runtime folder

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Usually the latter will help when shipping with the Houdini plugin enabled.

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So if that helps copy the HoudiniEngine folder from C:\Program Files\Side Effects Software\Houdini XX.Y.ZZZ\engine\unreal\4.XX to X:\Path\To\YourUE4Project\Plugins\Engine\Runtime\

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That might work @void nest 😃

void nest Mar 22, 2019, 3:17 PM

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Thanks a lot for the help 😉

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I went over the ini file and saw that I forgot to add something

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I added it now, recompiling. Hope it works

astral gust Mar 22, 2019, 3:17 PM

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Alright

void nest Mar 22, 2019, 3:18 PM

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forgot to add:

[/Script/Engine.GameEngine]
+NetDriverDefinitions=(DefName="GameNetDriver",DriverClassName="OnlineSubsystemSteam.SteamNetDriver",DriverClassNameFallback="OnlineSubsystemUtils.IpNetDriver")

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so fingers crossed that that was the issue 🤞

void nest Mar 22, 2019, 3:51 PM

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It's fixed 😉

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thanks man for the help!

oak pond Mar 22, 2019, 3:56 PM

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I love scrolling through 167 messages only to find I got no replies

📎 image0.png

astral gust Mar 22, 2019, 4:06 PM

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@void nest Great to hear!

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@oak pond In our case we just test running with 2 instances using the viewports. Then when we think it's stable we request a review with 2 peer programmers from Swarm and test the changes manually. Not sure if online functionality is easy to test automatically. Maybe some Epic devs can answer this instead.

oak pond Mar 22, 2019, 4:12 PM

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ok, thanks

keen thorn Mar 22, 2019, 4:34 PM

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Hi anyone know why a character actor resist setting velocity up to around 30 on server but not client?

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is it because the AI controller is doing something to it on the server only?

thin stratus Mar 22, 2019, 4:48 PM

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When a Server corrects the Client. The Client will discard all moves PRE Timestamp of the correction, apply the correction and then replay all POST Timestamp moves, right?

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I don't quite get why the CMC shows a capsule on the client on the corrected location and the current location

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These are def quite a chunk away from each other

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LogNetHoverMovement: Warning: *** Server: Error for BP_Hoverdrone_DEV_C_1 at Time=101.491 is 1.787
LogNetHoverMovement: Warning: *** Client: Error for BP_Hoverdrone_DEV_C_1 at Time=101.491 is 37.326
LogNetHoverMovement: ClientUpdatePositionAfterServerUpdate Replaying 3 Moves, starting at Timestamp 101.507202
LogNetHoverMovement: Warning: *** Server: Error for BP_Hoverdrone_DEV_C_1 at Time=101.524 is 1.917```

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Also why is the Server always printing another error after it already found one 🤔

keen thorn Mar 22, 2019, 4:57 PM

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Im also confused :(

fleet raven Mar 22, 2019, 5:12 PM

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@winged badger right that makes sense to use the timestamp, but then a situation like this could happen:
frame 1: change property A and B, send bunch containing them
frame 2: change property B, send bunch containing it
client receives only bunch 2, so it updates B, and is now in a state that has never existed on the server

thin stratus Mar 22, 2019, 5:17 PM

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Don't you need to send the Client's EndResult then?

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Means in Frame 2, the Server would already notice that the Properties are not synced

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The double printing of the Server seems to be normal

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Comes from the 50-80 ping

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CMC does that too (just tried). Gets a lot worse when you have a higher ping

keen thorn Mar 22, 2019, 5:35 PM

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setting character movement component velocity is so weird, it desync server and client :(

thin stratus Mar 22, 2019, 5:35 PM

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You don't want to just set it

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You can use other things, like LaunchCharacter and such

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To apply some forces

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Just make sure you do that on server and client

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That stuff is not replicated by default

keen thorn Mar 22, 2019, 5:37 PM

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when i set velocity on server, the velocity gets replicated correctly. But the server pawn doesnt move for small velocities, while client keep sliding (as it try to simulare)

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simulate

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setting velocity to like 20 gives this desync

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im trying to make a kinda force push field

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thats why i set velocity

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for smoothness

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but then I encounter this issue

limber mortar Mar 22, 2019, 6:06 PM

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I have a multiplayer blueprint actor with a particle effect. 100 or so of these can be dynamically spawned in game per tick. Is it more efficient to keep the particle effect within the blueprint as a component, or spawn an emitter from the blueprint? This would spawn multiple emitters per tick in my game.

winged badger Mar 22, 2019, 6:10 PM

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the more efficient way is to pool inactive ones, then just Pop the top one and reuse it when needed

solar stirrup Mar 22, 2019, 6:12 PM

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What exactly should I put in a player's state?
Let's say for an FPS game
Should health go in there?

winged badger Mar 22, 2019, 6:12 PM

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Anything that is publicly available to all players can go there

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also, everything you need to restore the player after it disconnects, if you are supporting that

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as the PS will survive its player disconnecting

solar stirrup Mar 22, 2019, 6:14 PM

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hmm okay

winged badger Mar 22, 2019, 6:15 PM

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health can go there, but it somehow fits on a Pawn more naturally

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if you are using any teams/team display widget

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PS makes a good context for it

solar stirrup Mar 22, 2019, 6:16 PM

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aight

winged badger Mar 22, 2019, 6:17 PM

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but i think in its original design it was meant to hold stuff like score

limber mortar Mar 22, 2019, 6:18 PM

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oh so I can pool them eh, that is good to know

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This is the last actor I need working for my game, so I don't want to make any major changes, but I will look into it

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I'm a UE4 noob, first game ever

winged badger Mar 22, 2019, 6:19 PM

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@solar stirrup i am working on a co-op game, my PS mirrors the variables for Health, Armor and Ammo

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and i am using that for bindings on a list of widgets, each representing one team member

solar stirrup Mar 22, 2019, 6:20 PM

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Why not have them in the PS and have the Character/Pawn reference them?

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unless that's what you do already

winged badger Mar 22, 2019, 6:20 PM

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they just don't belong there

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Health and Armor have their own components

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on the Pawn

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PS just hooks into OnHealthChanged/OnArmorChanged delegates and updates its values as required

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i really don't want to make my PlayerState into a GodClass so i can more conveniently display 3 progress bars in the UI 😄

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i do keep my inventory on the PS, so i can restore it if a player disconnects then reconnects

solar stirrup Mar 22, 2019, 7:21 PM

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ty

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alright so I have an event that happens every X minutes which starts a healing process for all players

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what that means is that it should activate a particle effect on a component that exists on all players

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start healing the player server side

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how should I do that? I've been thinking about have a NetMulticast RPC called from the server that broadcasts a delegate on all clients to activate the particle effect

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and then another to stop it

winged badger Mar 22, 2019, 7:23 PM

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simple bRegenerating with OnRep that triggers a particle effect as well as client side simulation of regeneration

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it will give a smoother feel on clients then just relying on health replication updates

solar stirrup Mar 22, 2019, 7:24 PM

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welp that was easier

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than expected

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dunno why I didn't think about that fml

ember needle Mar 22, 2019, 8:29 PM

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all, given the free online services from ue4 i’m thinking to convert to them for matchmaking and chat. i’m currently using steam through advanced sessions. this is probably a noob question but is my understanding correct and if so, where can i get started?

sharp pagoda Mar 22, 2019, 8:55 PM

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@ember needle https://dev.epicgames.com/en-US/services

Epic Online Services

Epic Online Services | Services

With Epic Online Services, we're making it easier and faster for developers to successfully manage and scale high-quality games. As a game developer ourselves, we've tackled numerous hard problems over the years. With Epic Online Services, we're sharing the fruits of our labo...

ember needle Mar 22, 2019, 8:58 PM

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yes but what is the subsystem

sharp pagoda Mar 22, 2019, 9:00 PM

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Mmm that's a bit too broad. It's similar to Steam, just an online player management infrastructure

fleet raven Mar 22, 2019, 9:03 PM

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you can't get started yet

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unreal integration has not been released yet

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and most of the services haven't either

meager spade Mar 22, 2019, 9:17 PM

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@fleet raven you probably could get started if you read the api and implement it in 😄

fleet raven Mar 22, 2019, 9:22 PM

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br_animated_thinking

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yeah but that seems like a lot of work when epic will do that themselves in half a year

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man confusion level over 9000 when trying to add new correctly predicted behavior to char movement

solar stirrup Mar 22, 2019, 9:36 PM

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@winged badger hey! above you told me to "predict" the health regen on the client

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if I add health on each tick on the clientside, that won't replicate server-side right?

winged badger Mar 22, 2019, 9:40 PM

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no, replication is one way only

solar stirrup Mar 22, 2019, 9:41 PM

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aight great

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which order does it happen tho? like if the server modifies the value

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and I try to edit

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is it:

- Receive value from server
- Edit client side

or

- Edit clientside
- Receive value from server

fleet raven Mar 22, 2019, 9:43 PM

#

replication processing happens before actor/component ticks on the client side

#

so the first

solar stirrup Mar 22, 2019, 9:43 PM

#

aight so I should skip one tick

#

actually that doesn't matter

fleet raven Mar 22, 2019, 9:44 PM

#

replication will take a while to arrive with a then-already-outdated value

solar stirrup Mar 22, 2019, 9:44 PM

#

there's no way the user will have the time to see the health jitter for a single tick

#

ah

#

hmm

fleet raven Mar 22, 2019, 9:44 PM

#

how much it is outdated depends on your clients latency

solar stirrup Mar 22, 2019, 9:45 PM

#

how should I proceed then?

#

I could change the heal to be by increments of X every Y seconds instead of linear

#

like 20 every 2 seconds

#

that way unless the player has a latency of 2000 ms it should be fine LUL

fleet raven Mar 22, 2019, 9:49 PM

#

whether you need to care about this depends on how important it is for the client to not see a value outdated by ~100ms

winged badger Mar 22, 2019, 10:01 PM

#

yeah, but the delay from replicating a bool that starts the simulation and first server correction will be minimal

#

after that simulation is accurate, it won't get corrected

steep grail Mar 22, 2019, 10:22 PM

#

Does anyone know a good tutorial for making a server to run a game I'm trying to make. I want to set the game server up on a spare PC and have it running all the time and then check for updates, update server then send the update to the clients.

astral gust Mar 22, 2019, 11:02 PM

#

Hey guys, since I couldn't solve the issue with the session state for Steam last week, and also couldn't find any relevant threads, I made a forum post https://answers.unrealengine.com/questions/884379/view.html.

winged badger Mar 23, 2019, 12:35 AM

#

@astral gust, are you calling StartSession synchronously right after CreateSession call?

solar stirrup Mar 23, 2019, 12:59 AM

#

Excuse me wtf

📎 unknown.png

#

📎 unknown.png

#

o

#

forgot UFUNCTION() since it's reflection nvm

#

┬─┬ ノ( ゜-゜ノ)

twin juniper Mar 23, 2019, 2:35 AM

#

yea if its got an underscore almost always needs ufunction or uproperty lol

#

i still cant get over "_Implementation"

jolly siren Mar 23, 2019, 2:59 AM

#

Does NetUpdateFrequency affect rpcs or only property replication?

winged badger Mar 23, 2019, 3:00 AM

#

i believe RPCs don't wait for Actor's scheduled update

jolly siren Mar 23, 2019, 3:01 AM

#

Even unreliable rpcs?

winged badger Mar 23, 2019, 3:02 AM

#

i know unreliable multicasts are handled differently from server/client, but don't know how

keen thorn Mar 23, 2019, 5:53 AM

#

im having this weird issue with velocity on ACharacter

#

it behaves different on server and client

astral gust Mar 23, 2019, 8:00 AM

#

@winged badger I'm calling it after CreateSession but in the delegate.

📎 unknown.png

twin juniper Mar 23, 2019, 10:00 AM

#

Hello guys I have a problem

#

with switching version when I setup my dedicated server

#

hmm

#

{
Running D:/UE 4.18/UnrealEngine-4.18/Engine/Binaries/DotNET/UnrealBuildTool.exe -projectfiles -project="D:/DISK_E/test/test.uproject" -game -engine -progress -log="D:\DISK_E\test/Saved/Logs/UnrealVersionSelector-2019.03.23-11.07.28.log"
ERROR: UnrealBuildTool Exception: System.IO.DirectoryNotFoundException: Could not find a part of the path 'd:\disk_e\test\saved\logs\unrealversionselector-2019.03.23-11.07.28.log'.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share)
at UnrealBuildTool.UnrealBuildTool.GuardedMain(String[] Arguments) in D:\UE 4.18\UnrealEngine-4.18\Engine\Source\Programs\UnrealBuildTool\UnrealBuildTool.cs:line 578
}

#

this is the error

#

what to do to fix the problem?

red sand Mar 23, 2019, 10:16 AM

#

Is there a way to check if the player is AFK?

twin juniper Mar 23, 2019, 10:24 AM

#

and in the error writes that it can't find the directory "d:\disk_e\test\saved\logs\unrealversionselector-2019.03.23-12.03.36.log'."
after d:\disk_e\test I haven't got folder saved and logs
hmm

#

📎 unknown.png

#

anyone to can help?

winged badger Mar 23, 2019, 10:44 AM

#

@red sand you could probably hook into input component and keep track of the time since last input was given

#

its where i's start, anyways

red sand Mar 23, 2019, 10:45 AM

#

great, I'll try that..

winged badger Mar 23, 2019, 10:46 AM

#

@astral gust iirc you need to create a session and start the server, and everything else is handled automagically

astral gust Mar 23, 2019, 10:55 AM

#

@winged badger Yeah the StartSession delegate also returns success, but the SessionState doesn't seem to be updated.

winged badger Mar 23, 2019, 10:56 AM

#

did you open a level with ?listen during all that?

astral gust Mar 23, 2019, 11:16 AM

#

Yeah I open a level with ?listen and absolute enabled.

meager spade Mar 23, 2019, 11:18 AM

#

@twin juniper make the folders

#

Saved/Logs

#

its that simple..

astral gust Mar 23, 2019, 11:18 AM

#

@winged badger It's also interesting to note that when you start the game the without creating a session yet, Steam will see the game as "Invite to Play". Then when you create a lobby its set to "Invite to Lobby". And after calling StartSession it should set it to "Invite to Play" again like most games, but it doesn't for some reason.

twin juniper Mar 23, 2019, 11:21 AM

#

okay

#

it works ihuu

#

but I must to have thse files after build but I haven't got them

📎 unknown.png

#

I have these:

#

📎 unknown.png

#

what to do? @meager spade

meager spade Mar 23, 2019, 11:29 AM

#

did you create a Server target?

#

and did you build the server target in vs?

twin juniper Mar 23, 2019, 11:30 AM

#

📎 unknown.png

#

I have got the servertarget.cs edited it

#

how to build the server target in vs?

#

I follow the steps in this tutorial: https://wiki.unrealengine.com/Dedicated_Server_Guide_(Windows_%26_Linux)

Dedicated_Server_Guide_(Windows_%26_Linux)

#

@meager spade

#

I am on the end of 5 step

meager spade Mar 23, 2019, 11:35 AM

#

you have VS open?

#

at the top is a drop down that says Developement Editor, select server

#

and build

twin juniper Mar 23, 2019, 11:40 AM

#

yes

#

i have open vs

#

I am idiot

#

xD

#

it says Developement Server I made it with Developement Editor and thik why it has errors

#

xD

tardy cosmos Mar 23, 2019, 1:27 PM

#

hi hi super quick question.
If I have a game mode where I call an event from a controller that is multicast, should I expect to be called on the player controller that is in the server and client ?

twin juniper Mar 23, 2019, 1:29 PM

#

Hello guys I have now problem with packaging

#

📎 unknown.png

winged badger Mar 23, 2019, 1:29 PM

#

You should expect all your clients to get disconnected @tardy cosmos

#

As soon as you call it

twin juniper Mar 23, 2019, 1:30 PM

#

anyone can help to fix the problems?

#

@meager spade

tardy cosmos Mar 23, 2019, 1:32 PM

#

@winged badger why disconnected?

winged badger Mar 23, 2019, 1:33 PM

#

You call a function on clients gamemode, or client version of a controller it doesn't have locally

tardy cosmos Mar 23, 2019, 1:33 PM

#

no no

#

on the server

winged badger Mar 23, 2019, 1:33 PM

#

It gets disconnected

tardy cosmos Mar 23, 2019, 1:33 PM

#

game mode only works on server

#

so the gfame mode grab a player controller and call a multicast event from the player controller

winged badger Mar 23, 2019, 1:33 PM

#

And if you muliticast from GM

#

All your clients drop immediately

#

8f you multicast from PC, all but the client that owns it and listen server host drop imediatelym

#

Client 1 doesnt have client2s PC

#

So you effectively call a function on null object

#

In short, you cant have multicasts in GameMode or in PlayerControllers

tardy cosmos Mar 23, 2019, 1:38 PM

#

so the server owns both PC?

winged badger Mar 23, 2019, 1:38 PM

#

No

twin juniper Mar 23, 2019, 1:39 PM

#

anyone can help me?

tardy cosmos Mar 23, 2019, 1:39 PM

#

so if I have 2 players ( one is the server and the other the client), and I sent a multicast from the server grabbing both PC, one of those shouldtn reply on the client side?

winged badger Mar 23, 2019, 1:40 PM

#

@twin juniper this is not a payed tech support, zou'll find people more willing to help when you are less insisting on it

twin juniper Mar 23, 2019, 1:40 PM

#

okay

#

I will wait and be polite

#

😃

winged badger Mar 23, 2019, 1:41 PM

#

Client doesnt have an instance of host PC

tardy cosmos Mar 23, 2019, 1:42 PM

#

but have an instance of one of the pc

winged badger Mar 23, 2019, 1:42 PM

#

So if you tell the client to call a function on it, boom

twin juniper Mar 23, 2019, 1:42 PM

#

why I have this file in the folder after the packaging?

#

📎 unknown.png

tardy cosmos Mar 23, 2019, 1:45 PM

#

ui

#

unity?

winged badger Mar 23, 2019, 1:45 PM

#

And if you multicast is inside the PC, as soon as its called you tell everyone to execute a function on it

tardy cosmos Mar 23, 2019, 1:45 PM

#

mmh I was trying to simplified to uynderstand

#

so I have made this

#

📎 unknown.png

#

on event possessed from a character, it calls a multicast event that is test

#

so what I expedcts is to see this print on client and server

winged badger Mar 23, 2019, 1:46 PM

#

That is Pawn, not PC

tardy cosmos Mar 23, 2019, 1:46 PM

#

yes, it is a simplification, the pc is harder to explain

twin juniper Mar 23, 2019, 1:46 PM

#

I used ue 4 idk why it makes unityfile-the f**k?

#

I deleted and try again to see what will happen

winged badger Mar 23, 2019, 1:47 PM

#

Possess happens immediately after the pawn is created

twin juniper Mar 23, 2019, 1:47 PM

#

📎 unknown.png

#

nothing

winged badger Mar 23, 2019, 1:47 PM

#

When using engine framework for spawning

#

It did not have time to replicate yet

tardy cosmos Mar 23, 2019, 1:48 PM

#

it make sense

#

actually I am handling the starting new player

#

📎 unknown.png

winged badger Mar 23, 2019, 1:48 PM

#

If you were to set a replicated variable

tardy cosmos Mar 23, 2019, 1:48 PM

#

maybe it does not have time to replicate and make whatever I want

winged badger Mar 23, 2019, 1:48 PM

#

Then pr8nt from onrep

#

That would work

tardy cosmos Mar 23, 2019, 1:49 PM

#

I was truying onrep, but I wanted to bind an event, and it seems I cannot bind from insdie a onrep

#

📎 unknown.png

winged badger Mar 23, 2019, 1:49 PM

#

You can, if you use CreateEvent and bind it by name

#

Also, BeginPlay executes on every machine 8ndependently

#

And all expose on spawn, as well as replicated variables set immediately after server spawns an actor, will be replicated before client calls BeginPlay

tardy cosmos Mar 23, 2019, 1:52 PM

#

ooh that is interesting

winged badger Mar 23, 2019, 1:52 PM

#

Beg8nPlay is generally a good place for event bindings

tardy cosmos Mar 23, 2019, 1:52 PM

#

I will try all that information

#

I didnt know the order

#

So prbably the pawn is already setup once the beginplay it is fired?

winged badger Mar 23, 2019, 1:53 PM

#

BeginPlay is the last step in setup

#

Note that on server only expose on spawn variables are set before BeginPlay

tardy cosmos Mar 23, 2019, 1:55 PM

#

ahh so not on clients

winged badger Mar 23, 2019, 1:55 PM

#

Unless you do deferred spawning and set them before you call FinishSpawning, but i do not think you can do that from blueprints, c++ 9nly

tardy cosmos Mar 23, 2019, 1:55 PM

#

okey

#

thanks anyway

#

I will try it this afternoon

twin juniper Mar 23, 2019, 2:13 PM

#

you can help me with the packaging problem or? @winged badger

winged badger Mar 23, 2019, 2:14 PM

#

as far as unreal errors come, that one seems pretty clear

#

i don't know what you did, or how to solve it off the top of my head, and i'm not about to do research for you 😉

twin juniper Mar 23, 2019, 2:15 PM

#

okay

#

I am following this: https://wiki.unrealengine.com/Dedicated_Server_Guide_(Windows_%26_Linux)

Dedicated_Server_Guide_(Windows_%26_Linux)

#

@winged badger

winged badger Mar 23, 2019, 2:27 PM

#

yeah, im also not reading thru a dedi tutorial for linux in order to help you 😛

twin juniper Mar 23, 2019, 2:30 PM

#

it is not only for linux

#

I make it for windows

#

it is for linux windows and all the platforms

#

@winged badger

winged badger Mar 23, 2019, 2:39 PM

#

i am not reading any tutorial in order to help you

#

do not @ me again

twin juniper Mar 23, 2019, 2:45 PM

#

okay

#

sorry

#

because you didn't answer this is the reason

ruby meteor Mar 23, 2019, 8:03 PM

#

Hey guys I am experiencing a weird issue, I have a dedicated Steam server running on Level1, but every time I "successfully" connect to it, the client just loads the default level (Level0) again, instead of loading the correct level that the server is running on. I am using Advanced Steam Sessions.

#

Create Session on the dedicated Server (Level1)

📎 adv1.PNG

#

Join Session from Level0

📎 adv3.PNG

#

This are the relevant logs:

[2019.03.23-20.06.19:987][391]LogOnlineSession: OSS: Join session: traveling to steam.90124105695555592:7777
[2019.03.23-20.06.19:987][391]LogBlueprintUserMessages: [MainMenuHUD_C_0] Session Join Success
[2019.03.23-20.06.20:001][391]LogNet: Browse: steam.90124105695555592//Game/UI/MainMenu/Level0

limber mortar Mar 23, 2019, 10:35 PM

#

Zlo, I think yesterday you were saying that 9ms was a high animation time. Is 391 calls high as well?

📎 unknown.png

meager spade Mar 24, 2019, 1:37 AM

#

@limber mortar without seeing why your animation time is so high, we cant help. also limit your scope to gamethread, as that is what you need to focus on

#

but 9ms on AnimGameThreadTime

#

geeeez

#

what ARE you doing

limber mortar Mar 24, 2019, 2:22 AM

#

Well, actually you did answer part of my question

#

I wasn't asking why, I was trying to confirm 9 ms was in fact too high

#

I have about 50 vehicles, 30 animals in idling animations, and 30 NPC in animation

meager spade Mar 24, 2019, 2:24 AM

#

thats still way to high

#

i have 150 monsters

limber mortar Mar 24, 2019, 2:24 AM

#

so knowing 9 ms is way high, the next part would be, is it because of 391 calls

meager spade Mar 24, 2019, 2:24 AM

#

and only use around 1ms

limber mortar Mar 24, 2019, 2:24 AM

#

but that doesn't sound like too many

meager spade Mar 24, 2019, 2:24 AM

#

well without seeing what you do

#

i cant say

limber mortar Mar 24, 2019, 2:24 AM

#

for sure

#

I didn't want to go deep into troubleshooting if 9ms was normal

meager spade Mar 24, 2019, 2:24 AM

#

calls is how many times its been accessed

#

no 9ms is not normal

limber mortar Mar 24, 2019, 2:25 AM

#

All vehicles, animals, and NPC are stationary

meager spade Mar 24, 2019, 2:25 AM

#

so they should use next to nothing

limber mortar Mar 24, 2019, 2:25 AM

#

and have these high times

meager spade Mar 24, 2019, 2:25 AM

#

thats what i mean, you are doing something wrong

limber mortar Mar 24, 2019, 2:25 AM

#

yeah, idling/breathing anim

meager spade Mar 24, 2019, 2:25 AM

#

with your animations

limber mortar Mar 24, 2019, 2:25 AM

#

most likely 😄

meager spade Mar 24, 2019, 2:25 AM

#

did you get my pm?

limber mortar Mar 24, 2019, 2:26 AM

#

yes thanks

#

📎 unknown.png

meager spade Mar 24, 2019, 2:27 AM

#

you might want to use animgraphs

limber mortar Mar 24, 2019, 2:27 AM

#

ok

meager spade Mar 24, 2019, 2:27 AM

#

rather than playing assets like that

limber mortar Mar 24, 2019, 2:27 AM

#

just fyi

📎 unknown.png

#

I actually spent $3 on my animal set

meager spade Mar 24, 2019, 2:27 AM

#

yeah its not the animation

limber mortar Mar 24, 2019, 2:27 AM

#

but I used adobe fuse on characters

#

so I didn't make the animals, maybe that is the problem

meager spade Mar 24, 2019, 2:28 AM

#

doesnt matter

#

the animals are probably not the issue

#

you tried to isolate

#

ie, remove the animals

#

and just have npc's

#

and then profile?

#

you need to find out what character or animation is causing the high game time

limber mortar Mar 24, 2019, 2:29 AM

#

I took the anim out of the actor

#

disabled playing and looping

#

and such

#

but still present

meager spade Mar 24, 2019, 2:29 AM

#

for all of them?

limber mortar Mar 24, 2019, 2:29 AM

#

yeah

#

I was looking at profiler is why I looked at animations

meager spade Mar 24, 2019, 2:29 AM

#

and its still 9ms?

#

on game time?

limber mortar Mar 24, 2019, 2:29 AM

#

yeah

#

I even removed from tick

#

I didn't understand why they still showed up

meager spade Mar 24, 2019, 2:30 AM

#

removed what from ftick?

limber mortar Mar 24, 2019, 2:30 AM

#

but I didn't get an answer in the channel

#

the animal actor, I tried a few different things to get the actor to stop sending animation calls during tick

#

The enable tick box

#

and enable for dedicated server

meager spade Mar 24, 2019, 2:31 AM

#

why are you sending animation calls during tick?

limber mortar Mar 24, 2019, 2:31 AM

#

The actor blueprint tick enabled

meager spade Mar 24, 2019, 2:31 AM

#

im confused

#

anyway im going bed, but per my pm, its up to you

limber mortar Mar 24, 2019, 2:31 AM

#

thanks

meager spade Mar 24, 2019, 2:31 AM

#

i can also explain the profiler better

limber mortar Mar 24, 2019, 2:31 AM

#

yeah no doubt

#

sorry for the confusion on my partt

meager spade Mar 24, 2019, 2:31 AM

#

its ok

tribal solstice Mar 24, 2019, 4:32 AM

#

hey ya'll. i'd like to make a spectator mode in multiplayer so someone connected to the server can watch a spectator cam of another play while they're in VR. what's the proper way to 'cast' this spectator view to a player?

#

is it necessary to create a spectator pawn or can I just place a camera that follow the player in VR and render that to a texture to display to the spectator client?

winged badger Mar 24, 2019, 4:38 AM

#

without the Pawn i don't think your NetRelevancy will work properly

#

but you should be able to SetViewTarget to any camera on the map

tribal solstice Mar 24, 2019, 4:39 AM

#

I see. Can it be a custom Pawn or does it have to be a 'Spectator Pawn'?

winged badger Mar 24, 2019, 4:39 AM

#

you can set a SpectatorPawn class in the GameMode ^^

#

i never used them, so i never read thru SpectatorPawn code

#

but i imagine it will have a few useful functions in it

tribal solstice Mar 24, 2019, 4:40 AM

#

Yeah can't find much info on it.

#

Blueprints-wise at least

winged badger Mar 24, 2019, 4:42 AM

#

its overriden Pawn

#

doesn't create a mesh, can't be damaged, always spawns and is on collision profile Spectator

tribal solstice Mar 24, 2019, 4:42 AM

#

I still want the 'spectator' to be able to have control input and trigger things in game

#

ah I see

#

thank you

#

probably best for me to just make a custom one

winged badger Mar 24, 2019, 4:43 AM

#

its PossessedBy is slightly altered so not to change the NetRole if it doesn't replicate

#

and thats it

tribal solstice Mar 24, 2019, 4:43 AM

#

netrole as in client or server?

winged badger Mar 24, 2019, 4:45 AM

#

as in, it doesn't get registered with NetDriver

#

so basically, nothing exposed to BP there

tribal solstice Mar 24, 2019, 4:47 AM

#

I don't know about Netdriver yet

winged badger Mar 24, 2019, 4:47 AM

#

just a few convenience/optimizations already done for you

tribal solstice Mar 24, 2019, 4:47 AM

#

I'll look into it, thank you

winged badger Mar 24, 2019, 4:48 AM

#

normal PC will make its Pawn replicate

#

unless its a Spectator

tribal solstice Mar 24, 2019, 6:07 AM

#

Copy that, thanks for your help Zlo!

keen thorn Mar 24, 2019, 6:58 AM

#

Anyone know why Server and client simulate velocity different for Character class?

#

or even a pawn

grand kestrel Mar 24, 2019, 9:06 AM

#

In UT they replicate sound + animation for weapon cosmetics, would it make sense to only replicate animations but play the sound on the animation timeline? (Can you also conditionally disable this for animations?)

#

Would cut down on a multi RPC

tardy cosmos Mar 24, 2019, 9:19 AM

#

Hi hi , good morning. Quick question. Is there anyway that the server can know the inputs of a client?

#

inputs axis*

thin stratus Mar 24, 2019, 9:19 AM

#

Only by passing them to the Server

#

@keen thorn Afaik they don't?
Pawn isn't replicated like a Character. The Character replicates Movement via the CharacterMovementComponent(CMC).
And they both calculate the Velocity the same way. Client just passes InputAcceleration to the Server.

#

@grand kestrel Sure, if that brings the desired result

grand kestrel Mar 24, 2019, 9:21 AM

#

@thin stratus Thought I might be missing something obvious

#

I wonder why UT opted for the extra replication

thin stratus Mar 24, 2019, 9:22 AM

#

UT is far from done

grand kestrel Mar 24, 2019, 9:22 AM

#

Well, yeah

thin stratus Mar 24, 2019, 9:22 AM

#

Can totally be that this was just the faster way

grand kestrel Mar 24, 2019, 9:22 AM

#

I wonder if animations lose attenuation settings

#

Or can't be conditionally disabled

#

Etc

#

Need to research/test

tardy cosmos Mar 24, 2019, 9:26 AM

#

my problem is that I am preventing a charcater to go outside of the camera view. So if a character is in the top margin, its movememnt is blocked, except that if the player tries to go down. But this logic only happens on the client. Since the CMC replicates the movement on the server, the character in the server is also blocked but does not have the info of the axis telling that the charcater should go down. So the final result is that the client tries to go down, but server blocks the movmement forever

thin stratus Mar 24, 2019, 9:28 AM

#

Either you make it client or server authoritive

tardy cosmos Mar 24, 2019, 9:28 AM

#

So or I sent the axis info to the server to unblock the character or I say the server that do not block my movement never ( so I remove the logic of blocking there). But then, the interplation of the movment make that the character on the server moves and the client tries to block

thin stratus Mar 24, 2019, 9:28 AM

#

If it's Client Authoritive, then you don't let the Server check anything.

#

It just walks and you do all the filtering before even calling "AddMovementInput"

tardy cosmos Mar 24, 2019, 9:28 AM

#

I am doing the filter after call addMovmementInput

thin stratus Mar 24, 2019, 9:29 AM

#

But why

#

Just filter before giving the movement command

#

"Can I walk left? No? Okay."

tardy cosmos Mar 24, 2019, 9:31 AM

#

I will try that

#

thanks!

thin stratus Mar 24, 2019, 9:33 AM

#

Just be aware that this allows cheating

#

As Clients can just pass by these checks if wanted

cerulean acorn Mar 24, 2019, 9:33 AM

#

Question: I'm trying to make an actor - an object - "net irrelevent" to some pawns but not others. I'm overriding the actor's IsNetReleventFor() but the break point inside it is never reached. The object is a C++ class but transformed into a blueprint with NetLoadOnClient and Replicates checked. The actor was not spawned on the fly but is set on a map when loaded on the server. Anything I should be looking into - if it is at all possible to achieve ?

tardy cosmos Mar 24, 2019, 9:56 AM

#

@thin stratus thanks, it solve my problem. I am so focused on learning the logic behind unreal that I am just losing the capability of make good logic

cerulean acorn Mar 24, 2019, 10:03 AM

#

I guess a simpler question would be: can IsNetReleventFor() be overridden for other actors besides APawn and APlayerController and if so, what do I need to enable it ? Because simply overriding it doesn't automatically make it happen as my breakpoint inside it is never reached.

meager spade Mar 24, 2019, 11:47 AM

#

@cerulean acorn youi have to turn off use owners relevancy

cerulean acorn Mar 24, 2019, 11:50 AM

#

It's already off. My only checks are NetLoadOnClient and Replicates.

winged badger Mar 24, 2019, 12:28 PM

#

your breakpoint when you are debugging server?

#

because that function is never called on clients

#

also, afaik any use of replication graph will bypass that function entirely

#

@cerulean acorn

cerulean acorn Mar 24, 2019, 12:34 PM

#

Yes, the server.

winged badger Mar 24, 2019, 12:35 PM

#

and yes, you can override AActor::IsNetRelevant for, it even has a different implementation then APawn

cerulean acorn Mar 24, 2019, 12:36 PM

#

I got it to work, actually, but only on actors spawned deliberately. I guess I'm struggling with NetLoadOnClient at the moment and how I can use that instead of spawns.

#

So much effort. 😩

#

But the damn server takes forever to compile. Something forces the recompilation of 412 files even though I touched one.

winged badger Mar 24, 2019, 12:41 PM

#

that works only for Actors in the package, bNetLoadOnClient

#

destroys them if its a client and value is false

cerulean acorn Mar 24, 2019, 12:45 PM

#

right, testing this in a few seconds (411/412) ...

#

Yep, got it now. NetLoadOnClient now works. Probably forgot a flag somewhere.

#

Thank you all.

keen thorn Mar 24, 2019, 4:32 PM

#

@thin stratus I gave tested this, is you get the movenent component of a Character, then use Set Velocity to some lower value like 10 on tick, server wont move the character but client will. More interestingly if u set t.MaxFps to something lower than 30 like 15, at certain fps server will move, and wont on other fps

thin stratus Mar 24, 2019, 4:34 PM

#

Are you using deltaseconds when doing that?

#

Cause tick without deltaseconds makes no sense

keen thorn Mar 24, 2019, 4:34 PM

#

deltaseconds only needed when u accumulate

#

but here i set to fixed 10

#

or 20

#

but the weird thing is why server and client behave dufferent

thin stratus Mar 24, 2019, 4:40 PM

#

Yeah seems to be weird

#

Constant 20 on Z

#

Server only starts "flying" if you jump

#

Client does if from the start

#

Could be cause the Client shortly lags and is "in air"

#

But the Server seems to fly upwards faster

dusky willow Mar 24, 2019, 4:41 PM

#

Hello, I'm doing everything according to this instruction (https://wiki.unrealengine.com/How_To_Use_Sessions_In_C++#Creating_a_Session_.7C_CPP_file), but I just can't connect (#include "Online.h"), which I share wrong

📎 unknown.png

How To Use Sessions In C++

thin stratus Mar 24, 2019, 4:44 PM

#

Hm same stuff happens if you AddForce @keen thorn

#

Strange ¯_(ツ)_/¯

#

@dusky willow My Wiki post is rather old. Could be that some stuff is included differently by now

#

wow

#

They broke it so much that it doesn't show the warnings anymore

#

Can Epic get that freaking Wiki out

dusky willow Mar 24, 2019, 4:47 PM

#

@thin stratus I correctly understood that
tat article is not working at the moment

thin stratus Mar 24, 2019, 4:47 PM

#

I don't know if that article is still working

#

The Wiki is broken since ages

#

I can't even edit that post

#

It usually has a warning that it's only working for version 4.Something

#

But they seem to have broken the Wiki so much that these aren't even shown anymore

#

The general stuff of how the Sessions work and the functions further below are def working

#

Or maybe needing 1-2 little changes

#

But the includes could be different by now

#

Does it compile for you without the Online.h?

#

Might also be that "EngineMinimal.h" to "Engine.h" isn't required anymore

#

I would suggest you code first and then check the includes

dusky willow Mar 24, 2019, 4:49 PM

#

I'm going to try now

thin stratus Mar 24, 2019, 4:50 PM

#

Anyway, g2g, dinner and stuff. cheers

dusky willow Mar 24, 2019, 4:53 PM

#

@thin stratus No, I could not build

keen thorn Mar 24, 2019, 4:55 PM

#

@thin stratus i set constant X velocity

#

this bug is really weird, especially its fps dependent, but client isnt, should I report as hug?

#

bug

dusky willow Mar 24, 2019, 5:07 PM

#

I'm starting to study a dedicated server, but as I understand this article (https://wiki.unrealengine.com/How_To_Use_Sessions_In_C++#Creating_a_Session_.7C_CPP_file) is not up to date. Maybe someone knows more articles which describe about the same, or is it the only article.

How To Use Sessions In C++

steep grail Mar 24, 2019, 7:42 PM

#

@twin juniper try this tut

#

https://allarsblog.com/2015/11/05/support-dedicated-servers/

Allar's Blog

How To Set Up Dedicated Servers for Windows and Linux For Your UE4...

This document covers the bare basics on how to get your Unreal Engine 4 game project able to build both Windows and Linux dedicated server builds, using just a Windows machine for compiling. Requirements For 4.9.X or older, you need Visual Studio Community Edition 2013 For 4.10

tribal solstice Mar 24, 2019, 9:00 PM

#

Heyo - is it possible to replicate the Audio Capture component's input?

#

So I'd like to have audio input on a client that transmits to all players

fringe dove Mar 24, 2019, 9:19 PM

#

@tribal solstice you may want to look into voice chat and the in world VoIP thing (UVoipTalker)

tribal solstice Mar 24, 2019, 10:17 PM

#

Can't seem to find any docs for how to get that working in Blueprints. You have any insight?

tribal solstice Mar 25, 2019, 12:13 AM

#

Gonna pry open the Proteus template and see how they got it done

limber mortar Mar 25, 2019, 1:27 AM

#

I'm troubleshooting some animation times and was wondering if anyone knew what could cause the same static mech/animation combination to have such different times in the AnimGameThread

📎 unknown.png

#

Both Buck and Buck 3 are just 2 static meshes standing still using an idling animation asset

#

the red is like .059 ms and the greens are ~.25

#

they use the same actor blueprint, and hence the same mesh/animation settings

grand kestrel Mar 25, 2019, 4:43 AM

#

Has anyone looked at UT's sound replication stuff indepth? Is there some reason they went to such lengths? Looks like it wont even use net relevancy.. (Talking about anything stemming from AUTPlayerController::UTPlaySound())

#

Maybe it made sense for a game with so few players in a small space?

plush wave Mar 25, 2019, 6:21 AM

#

How do I turn off replication for a networked actor? (ie. This actor is a car and should be networked for clients and server to see in the world but I want to spawn one in the "garage" that isn't networked, so clients and server can use the same garage to edit the car)

cedar finch Mar 25, 2019, 6:38 AM

#

@plush wave https://i.gyazo.com/5caca73d3272e9c4943164bac4684836.png

red ledge Mar 25, 2019, 6:39 AM

#

what would be the best way to communicate between client and master server?

#

the communication is just play hits Play, sends a request to server which send back the ip+port of an available server

#

the server would be just a python script

#

but with nothing specific inside

#

I'm just looking for the easiest (secure) way unreal can communicate with another application over the network

plush wave Mar 25, 2019, 7:08 AM

#

@cedar finch even setting that to false, the actor still spawns on clients

cedar finch Mar 25, 2019, 7:10 AM

#

@plush wave Oh. lol I didn't read it right. So you probably only need to change the event to "run on owning client"

#

For example when I want to play a sound on every character but I only want the sound to be heard by the player it plays on I use a "run on server" event, I get all the players, run a foreachloop, then call a custom event inside the individual character's BP that is set to "run on owning client"

heavy marlin Mar 25, 2019, 8:34 AM

#

Anyone know how to quickly toggle between networking and not in the editor ?

#

I don't need it if I'm tweaking animations !

thin stratus Mar 25, 2019, 9:00 AM

#

Change the amount of players back to 1?

cedar finch Mar 25, 2019, 9:08 AM

#

https://tenor.com/view/goteem-go-team-happy-fun-sports-gif-4789485

Tenor

thin stratus Mar 25, 2019, 9:12 AM

#

So, when sending this struct over the net, how much could one improve that bandwidth wise:

USTRUCT(BlueprintType)
struct FHoverInfo
{
    GENERATED_USTRUCT_BODY()

    UPROPERTY(BlueprintReadOnly, VisibleAnywhere, Category = "Core")
        float DistanceToFloor;
    UPROPERTY(BlueprintReadOnly, VisibleAnywhere, Category = "Core")
        FVector RotationNormal;
    UPROPERTY(BlueprintReadOnly, VisibleAnywhere, Category = "Core")
        FVector HoverNormal;
    UPROPERTY(BlueprintReadOnly, VisibleAnywhere, Category = "Core")
        bool bIsTracingFloor;

    FHoverInfo()
    {
        DistanceToFloor = -1.f;
        RotationNormal = FVector::ZeroVector;
        HoverNormal = FVector::ZeroVector;
        bIsTracingFloor = false;
    }

    // Removed operator== and !=, as well as ToString function for this code paste
};

#

The whole Struct serialization stuff for Network is something I actually barely/never touched

#

Doubt that rounding the normals would be good

#

Could turn the bool into a uint32 or similar, but with a single boolean it won't really make a diff afaik

thin stratus Mar 25, 2019, 9:42 AM

#

If I NetSerialize this struct, specially things like the float value, it would lose precision, right?
Now if I fill this struct on Client side and send it via RPC to use the same struct, for the same calculation, the calculation on the client would need to also round the float first or?

lean river Mar 25, 2019, 10:07 AM

#

if you implement netserialization that would be triggered everytime you try to send with rpc, or with replication.

#

but yeah you would lose precision

#

also i suggest to serialize fvectors too if you can ^^

thin stratus Mar 25, 2019, 10:09 AM

#

Would it make sense to serialize a Normal though?

#

They are really small already cause of the Length=1

#

I mean, not small in terms of data

#

But they require a higher precision behind the comma to even make sense

lean river Mar 25, 2019, 10:10 AM

#

well if you handle deserialize it would fit into 1 byte and you can get two point precision

#

like 0.01 can be 100 = 1 byte

#

normal fvector use 24 byte or 32 byte i cant remember

thin stratus Mar 25, 2019, 10:11 AM

#

32 I think

#

I will keep it in mind

#

Right now I'm struggling with movement correction that sometimes happens if you hit a wall -_-

void nest Mar 25, 2019, 10:12 AM

#

What is the easiest way to check on client if all child actors of a spawned mesh are spawned and ready on client? Right now I check each individual child actor and see if it returns as valid, if all actors return valid -> I do pseudo beginplay on client using tick. Is this a good approach or am I like John Snow and don't I know anything?

thin stratus Mar 25, 2019, 10:14 AM

#

That's tricky. In C++ I would probably spawn them and put them into a RepNotify variable

#

And use the same RepNotify function for all of them

#

And in there check if all references are valid

#

(Yes, in C++ you can use one RepNotify function for all your RepNotify variables)

#

In BPs you can do it similar

#

You'd just need to make a second function in which you test all the references

#

And call that function in every one of the OnRep functions ue4 generates

#

So each time an Actor replicates to the Client, you can check if the rest is valid

winged badger Mar 25, 2019, 10:16 AM

#

@thin stratus you can save a little just by changing those FVectors to FVector_NetQuantizeNormal

thin stratus Mar 25, 2019, 10:17 AM

#

Ah, that's a thing?

#

Good to know

winged badger Mar 25, 2019, 10:17 AM

#

it inherits from FVector, just serializes differently

#

in this case, 16 bits per component, but the range is 0-1 inclusive

void nest Mar 25, 2019, 10:17 AM

#

@thin stratus Thanks for your advice, I'll have a look 😃

thin stratus Mar 25, 2019, 10:19 AM

#

LocDiff(X=-1.864 Y=-0.020 Z=0.001)
So that's the correction I sometimes get when hitting a wall and sliding along it.
-X direction is inside the wall. Based on the location of server and client, the client seems to be the one that goes further into the wall than he should.
Both use the same movement code and the UMovementComponent::SlideAlongWall function.
Is that normal behavior? :<

#

Both are also blocking the wall, so it's not like the client is ignoring collision

void nest Mar 25, 2019, 10:23 AM

#

Is this a good idea? or a terrible idea? 😛 https://i.gyazo.com/2736cb132cae38535e2199b86b858d37.png

#

I take it this might be dangerous to do should any of the child actors fail to spawn

#

or am I overreacting?

#

wait i've got a better idea, I'll just do a non-loop based recheck using tick so the function keeps firing per tick but isn't constrained to an internal loop

thin stratus Mar 25, 2019, 10:29 AM

#

Tick and this Loop are both a bad idea :P

#

Specially the loop that loops back

void nest Mar 25, 2019, 10:32 AM

#

https://i.gyazo.com/859a802acb39d5695c1176325be6ebe6.png

#

https://i.gyazo.com/9c3d344061dd9cb6a1ad07a6cd3c5158.png

#

beginplayclient is an overrideable function in all child classes from this blueprint

#

Hah ok nvm it doesn't work 😂 problem is that because they aren't spawned yet the child actor array returns 0 haha

void nest Mar 25, 2019, 11:41 AM

#

Is it normal that when I use "SetActorLocation" on server only the actor also moves on the clients? Even when replicate movement is turned off? I though that actor location is completely local even on server when replicate movement is not checked, but for some reason my actor is moved on clients too when setting it's location on the server only.

#

How would I be able to treat the listen server completely like another connected client? I don't wan't the listen server to be able to set actor location without calling a rpc (yes In know calling an rpc to itself may be kinda weird, but it's how my system has to be)

real yacht Mar 25, 2019, 12:06 PM

#

where can i find all arguments when i'm starting dedicated server for example -log -nosteam, etc...

thin stratus Mar 25, 2019, 12:35 PM

#

@void nest You can't

#

A ListenServer is the Host, has Authority etc.

#

If you need a standalone Server, that is no client, then only DedicatedServers work

#

You can send ServerRPCs as the Server to the Server, but they just count as normal events

#

A ListenServer will still be the authority over all that stuff

void nest Mar 25, 2019, 12:39 PM

#

@thin stratus Ok, thanks for the info 😃

#

Is there a list of functions that are always replicated?

#

Like for example attaching to component or actor is always replicated if fired from the server

#

I didn't know set actor location was a similar "forced" replicated function. It'd be nice to see a list of all the functions to be aware about when used on listen servers

fleet raven Mar 25, 2019, 12:43 PM

#

it's not a replicated function

#

but it sets a replicated variable

#

check out what variables are replicated by default on actors/components

void nest Mar 25, 2019, 1:09 PM

#

Ok I was wrong, the set actor location is NOT replicated when fired on server. I was confused because the actor was attached to another actor, and the relative location when changed on server IS replicated down to all other clients.

#

So I'm guessing there is no way to use the attach to component or actor node on a listen server without it being force replicated?

#

Any workaround suggestions would be great 😛

thin stratus Mar 25, 2019, 2:19 PM

#

    if (StartPackedMovementMode != LastAckedMove->EndPackedMovementMode)
    {
        return true;
    }

    if (EndPackedMovementMode != LastAckedMove->EndPackedMovementMode)
    {
        return true;
    }

#

IsImportantMove of the Character SaveMove sturct checks if Start != End and End != End

#

Does that make sense or is that a bug?

#

I guess it make sense somehow?

plucky horizon Mar 25, 2019, 3:27 PM

#

Does somebody have a resource for learning replication on the C++ side?

fleet raven Mar 25, 2019, 3:29 PM

#

did you check the pins

plucky horizon Mar 25, 2019, 3:29 PM

#

i am now, I assume there is something in there =/

fleet raven Mar 25, 2019, 3:29 PM

#

http://cedric-neukirchen.net/2017/02/14/multiplayer-network-compendium/ read this to get started

Cedric Neukirchen

eXi

Multiplayer Network Compendium

plucky horizon Mar 25, 2019, 3:30 PM

#

lol that was the first one I clicked

#

thanks

thin stratus Mar 25, 2019, 4:02 PM

#

So

#

If movement gets corrected

#

it is smoothing that correction or?

#

And if it smooths it, as far as I understand, it moves the Collision Shape instantly and the Mesh over time

#

Actually it does not seem to smooth that at all

fleet raven Mar 25, 2019, 4:23 PM

#

why isn't there a standard rpc setting for multicast to all except owning player

#

it seems like a commonly useful path

pure abyss Mar 25, 2019, 4:30 PM

#

is replicating too much data cause lags?

thin stratus Mar 25, 2019, 4:32 PM

#

Yop

void nest Mar 25, 2019, 4:35 PM

#

Speaking of which, what are recommended ways to replicate movement information such as vectors and rotators?

#

knowing that the output date will be lerped

#

data*

pure abyss Mar 25, 2019, 4:35 PM

#

does too much RPC also affecting ?

thin stratus Mar 25, 2019, 4:36 PM

#

Yop

#

Everything that adds to the bandwidth usage can cause that if you do too much

pure abyss Mar 25, 2019, 4:36 PM

#

anyway to profile it in engine for dedicated server?

void nest Mar 25, 2019, 4:37 PM

#

If you call server RPC and multicast per tick then yes it will floor your bandwith especially when the rpc's are called from a client that has a high framerate, the higher the framerate the more the rpc is called (when set to reliable). Setting it to none reliable and making it update on intervals such as 0.1 seconds is better I guess?

pure abyss Mar 25, 2019, 4:37 PM

#

the only way that i know how to profile is using netprofile..which I can't find the network log

void nest Mar 25, 2019, 4:37 PM

#

But I still notice high bandwith usage

#

you have to record a profile first

pure abyss Mar 25, 2019, 4:37 PM

#

in engine?

thin stratus Mar 25, 2019, 4:37 PM

#

I think they added that a while ago

#

Specially for cloud based servers

#

When fortnite started getting bigger

#

But no idea how to use it

void nest Mar 25, 2019, 4:38 PM

#

when you play in editor or a development build you have to type netprofile enable to start recording and netprofile disable to stop recording

#

this will generate a profile that you can then open using the network profiler

#

@pure abyss yes you can record network data in-engine

#

although it's not recommended

pure abyss Mar 25, 2019, 4:40 PM

#

why is that

void nest Mar 25, 2019, 4:40 PM

#

as the result is not as reliable as in a packaged version

pure abyss Mar 25, 2019, 4:40 PM

#

I see

void nest Mar 25, 2019, 4:40 PM

#

with in-engine I mean when you simulate or play

#

not in the actual editor 😛

#

also, always record from the server, not the clients

#

client recording only show the rpc calls from that particular client

#

what you want is the actual server's data

pure abyss Mar 25, 2019, 4:42 PM

#

how do I record from the server? when i ticked "dedicated server"

void nest Mar 25, 2019, 4:42 PM

#

hmm no idea haha good question

#

I only know the command for listen server

#

but I guess you could probably use a console command node in blueprint using "is dedicated server" and has authority

#

with a delay node to disable the recording

pure abyss Mar 25, 2019, 4:44 PM

#

alright..thanks dude..let me try that out

void nest Mar 25, 2019, 4:44 PM

#

yw

thin stratus Mar 25, 2019, 4:44 PM

#

Okay so the same corrections I get, the default CMC+Character also gets

#

Only that their correction seems to be smoothed

#

.>

#

@chrome bay Do you happen to know if and where in the CMC corrections are smoothed?
SendClientAdjustment doesn't seem to do any form of smoothing. Or I just can't find it.

#

With a higher ping, the CMC also doesn't smooth anymore

#

Is there a max distance for this o.o

pure abyss Mar 25, 2019, 4:51 PM

#

how do I know when its too much?

📎 unknown.png

thin stratus Mar 25, 2019, 4:52 PM

#

When your lowed end internet players can't play your game anymore

#

e.g. check what the average or lower internet can do in terms of up and download rate

#

And make sure your games bandwidth isn#t using that

pure abyss Mar 25, 2019, 4:53 PM

#

I recorded the it on the server for 193 frames..so whatever that is replicated on tick i have to remove it?

#

I tried it with high speed connection with dedicated server hosted in AWS and the game run really really bad..which was not happening with peer to peer.

thin stratus Mar 25, 2019, 4:59 PM

#

Excuse my sorta offtopic: IT'S THE FREAKING CAMERA that causes the "lag" when getting corrected. Using a default attached one works fine.

#

@pure abyss It's really tricky to answer

#

Server running bad could be cause it's hosted across the sea?

#

Or because you took a too slow tier

#

But usually you want to remove all sort of tick based replication if possible

pure abyss Mar 25, 2019, 5:00 PM

#

im using free tier for testing

thin stratus Mar 25, 2019, 5:00 PM

#

And everything that is send via tick needs to be serialized etc. (if using C++ at least)

pure abyss Mar 25, 2019, 5:01 PM

#

serialized meaning? packed into a struct?

#

and deserialize on the server?

#

First time making an online game. and I have a 3 days deadline to solve this..pretty much doomed

#

😦

thin stratus Mar 25, 2019, 5:03 PM

#

Uff, ehm yeah it sorta means that

#

You can NetSerialize structs

#

And also use shorter, less precise vectors in RPCs

#

BLueprints also have them

#

NetQuantized

#

Something something

#

Is the vector name

#

Maybe that helps you already

#

The other way is finding out if you can't remove some tick rpcs

#

and simulate that stuff locally

maiden vine Mar 25, 2019, 5:05 PM

#

Anyone know why casting to any blueprint in an event in the Game mode setting a variable that's in game mode would cause a PHP script to give a 404 error in response? It works if I don't set the variable.

thin stratus Mar 25, 2019, 5:07 PM

#

I'm a full-time contractor

#

I work on whatever pays me well

#

Atm that is a multiplayer game, yes.

#

@maiden vine Are you doing any shenanigans with the GameMode from ClientSide?

maiden vine Mar 25, 2019, 5:08 PM

#

It's just a normal event that bugs out

thin stratus Mar 25, 2019, 5:09 PM

#

https://store.steampowered.com/app/613620/Hoverloop/

Steam

Hoverloop

In Short: Hoverloop is a Multiplayer Arcade Arena Combat game.Access an array of customizable drones with unique abilities. Use teleportation, deathrays, control jammers and super speed to carry your team, or yourself, to victory! Fight against or work together with friends i...

▶ Play video

#

Trailer is outdated. Will be replaced by someone else on the team.

#

Images are uptodate though

#

Well the trails is mainly Ui wise outdated

#

Game is still the same

maiden vine Mar 25, 2019, 5:10 PM

#

Funny thing is it use to work fine

#

Thought might be a workaround I did not know

#

It's not the casting that fails it is more of game mode is corrupted

#

Or varest plugin

#

Guess I'll just keep trying at it

chrome bay Mar 25, 2019, 6:13 PM

#

@thin stratus hey man sorry

#

It's in SmoothCorrection

#

SmoothCorrection_Interpolate does the capsule, then SmoothCorrection_Visuals does the mesh

#

When clients get an update via PostReceiveLocationAndRotation in the Character class, they apply it and notify the movement component it needs to do smoothing for the current frame (you probs know already but rep events/RPC's run before ticks are processed )

#

SendClientAdjustment is (annoyingly) called from the PlayerController would you believe so that it's sent at the last possible moment that frame

#

If your hover movement component inherits from PawnMovementComponent and implements the INetworkPredictionInterface you shouldn't have to add that call manually

twin juniper Mar 25, 2019, 6:21 PM

#

Hi i have a probleme so that the client health ín the Ui is only changed by getting demage from the server actor does any one know a fix for it

thin stratus Mar 25, 2019, 6:48 PM

#

@chrome bay The ClientAdjustment stuff is all from the interface, yeah. I have that already setup

#

I also now found out that the jitter I saw when getting a correction wasn't the pawn but my camera

#

Cause it's not attached to the pawn (rather set location)

charred crane Mar 25, 2019, 7:19 PM

#

I'm trying to create a spectator camera for my third person game. I'm using Set View Target With Blend and it works great for the server, but doesn't orient the camera correctly for clients. It does change the view target though. Any ideas?

amber plover Mar 25, 2019, 8:05 PM

#

this might have been asked before, but couldn't find anything online.
I'm semi new, so please keep the explanation grama friendly :P

How can I take all my players from one map into another map and keep them on the server, right now when i change map everyone gets disconnected and you can't host a new map server?

thanks for reading

charred crane Mar 25, 2019, 8:16 PM

#

@amber plover You have to use seamless travel. It's an editor setting i believe.

worthy perch Mar 25, 2019, 8:32 PM

#

It's a bool on the GameMode. AGameModeBase ::bUseSeamlessTravel

hoary spear Mar 25, 2019, 9:20 PM

#

How does one normally go about kicking a player from a session? I tried destroy session, but not sure if that should work if you just joined a session?

#

Originally i dont even wanna kick them, i dont want them to be able to join in the first place

#

guess i found my answer, there's not really any way of doing it from bp only

#

ill see if i can just hook up some keys and do it that way

charred crane Mar 25, 2019, 9:35 PM

#

@hoary spear Do you not want a specific player to join or do you want to limit the number of people able to join?

hoary spear Mar 25, 2019, 9:35 PM

#

I wanna refuse a player who doesnt already exist on the server after creation

#

so the idea now was using the extra settings

#

📎 unknown.png

fringe dove Mar 26, 2019, 12:50 AM

#

Is it safe to send a reliable RPC from server to client right after spawning an actor?

#

or does client have to acknowledge the actor channel has opened first with its own RPC? (seem to remember something like that with possessed pawn ack)

fringe dove Mar 26, 2019, 1:22 AM

#

on the client side I remember they will fail until after OnActorChannelOpen

fossil spoke Mar 26, 2019, 1:59 AM

#

Yeah you will have to wait for it to be valid on the Client. Can you get away with using a Replicated variable instead?

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That way state will be preserved and the Client can receive that state change (OnRep) when its version of the Actor is created.

fringe dove Mar 26, 2019, 2:07 AM

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I was using a replicated variable before but am in the process of changing to a reliable RPC because I need to order this one with other events

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so server won't queue it up until the channel opens?

safe marsh Mar 26, 2019, 3:33 AM

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is there some way to test a dedicated server (PIE) using a different map to the client

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when I play as a client with dedicated server enabled, the server map is set to the one which is currently loaded in the viewport

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If I set some levelBP logic for the dedicated server to load a different map, it loads it up, when the client tries to connect to the server, it loads into the map which was launched

gleaming vector Mar 26, 2019, 4:41 AM

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you dont have to wait actually

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the engine will send the RPC after the spawn

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there is just no reason to do it though

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you can handle everything related to on-spawn events either as a replicated variable or on BeginPlay

cedar finch Mar 26, 2019, 5:07 AM

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So I have a projectile grenade launcher and I want to deal radial damage when it hits and/or explodes but I want it to ignore friendly teammates and hurt the player who shot it as well as any enemies. nearby. I have the hit and explode logic in my projectile. I know there are a couple ways to do this but what is the best for network optimization. I was worried if somebody started shooting lots of projectiles it could lag up the game if I put a lot of logic and loops. Ideas?

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Here is the node if you guys wanna see it. It's harder with this radial damage, usually I can just get the hit actor but that doesn't work in every case with a grenade weapon. https://i.gyazo.com/239bf80775119d791de9ccff4b92240b.png

cedar finch Mar 26, 2019, 5:50 AM

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The way I did it was I already had all my player controllers stored in an array inside my Gamemode so I just got those and ran a foreach loop that cast to their controlled pawn. I then did a check to see if the pawn was the same pawn that spawned the projectile. If it wasn't then I added them into a new array. I then plugged that array into the ignored actors. It works fine I was just curious if there was another way or if this is optimal for networking?

fringe dove Mar 26, 2019, 5:56 AM

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@gleaming vector I don't particularly need it right after spawn, but it could just happen to get called there. in other cases I do need it via RPC because it needs to be ordered amongst a stream of other events or something bad could happen

gleaming vector Mar 26, 2019, 5:57 AM

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i have a similar situation

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i use a replicated variable and call some code on begin play

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also, you can't trust the order in which RPCs will play out

fringe dove Mar 26, 2019, 5:58 AM

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for reliable, in a single actor channel, you can can't you?

gleaming vector Mar 26, 2019, 5:58 AM

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if you are changing state, use a variable

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no, because they wont play when, for example, an actor becomes relevant after not being relevant

fringe dove Mar 26, 2019, 5:59 AM

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ok yeah that's a case (and I've run into that), but this one will always be relevant

gleaming vector Mar 26, 2019, 5:59 AM

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I also believe that they play in the order they are recieved

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not in the order that they are sent

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even if they are reliable

fringe dove Mar 26, 2019, 5:59 AM

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reliable is supposed to have an ordering guarantee, but only within a channel

gleaming vector Mar 26, 2019, 5:59 AM

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hmm

fringe dove Mar 26, 2019, 5:59 AM

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and a dedduplication guarantee

gleaming vector Mar 26, 2019, 6:00 AM

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yeah, i know about the de-dupe

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i dunno, I don't like client RPCs

fringe dove Mar 26, 2019, 6:00 AM

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the main thing is never trust reliable multicast

gleaming vector Mar 26, 2019, 6:00 AM

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they are often unreliable even when reliable

fringe dove Mar 26, 2019, 6:00 AM

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it doesn't work and isn't reliable

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because it has a shorter timeout than client timeout

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so you can have gaps with no way to tell unless you do your own sequence number setup within it

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it's a disaster..

gleaming vector Mar 26, 2019, 6:01 AM

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well, still... if you can get this bit working with a replicated variable... that variable is guaranteed to be set to that when the actor comes into existance

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I've noticed that too with netmulticast

fringe dove Mar 26, 2019, 6:01 AM

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in other cases I get by with a replicated variable in similar situations with a reliable stream

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by making the replicated variable a struct and putting a sequence number in it relative to the stream

gleaming vector Mar 26, 2019, 6:01 AM

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for example, the similar thing I have is with my inventory

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i replicate down the currently held item index

fringe dove Mar 26, 2019, 6:01 AM

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but here I actually need to get all of the events and replicated stuff can drop out in-betweens

gleaming vector Mar 26, 2019, 6:02 AM

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because I want the character to draw their weapon whenever they switch to a new weapon

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on BeginPlay, I check to see if that number is set

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if it is, I play the anim

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that catches the "spawns with item" case

fringe dove Mar 26, 2019, 6:05 AM

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yeah I'm not doing a typical replicate some stuff about the world, but instead replicate a bunch of exact inputs that must come in order but also must have as little latency as possible

gleaming vector Mar 26, 2019, 6:05 AM

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oh

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ok, yeah, well, try the RPC method

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I'm not sure if it will work in all cases

fringe dove Mar 26, 2019, 6:05 AM

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so I'm sending both reliable and unreliable and deduplicating the unreliable stream and merging it, and filling in gaps with it if input didn't change during packet loss

gleaming vector Mar 26, 2019, 6:05 AM

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it's very specific cases like that I wish you can open up a data channel for an actor

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and push packets yourself

fringe dove Mar 26, 2019, 6:06 AM

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yeah what I really want is to be able to peek reliable messages out of order

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if one is dropped, the next one may be able to fill in for it (I have counter telling how many frames back had the same inputs)

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on the note of a data channel, I wish you could also open a reliable one that would use tcp-like networking with a scalable window to send large data

gleaming vector Mar 26, 2019, 6:09 AM

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agreed

fringe dove Mar 26, 2019, 6:09 AM

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I think reliable rpcs aren't TCP-like and won't do backoff after packet loss etc.

gleaming vector Mar 26, 2019, 6:09 AM

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i tried to make a voxel world a long time ago

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and replicating it was the most annoying process in the entire world

fringe dove Mar 26, 2019, 6:12 AM

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yeah I can imagine that would be pretty brutal to try and do it all in engine without resorting to TCP

gleaming vector Mar 26, 2019, 6:12 AM

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yeah

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i think that's why phyronnaz did for his voxel system

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which makes total sense

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it would take an engine mod to open a data channel for world data

thin stratus Mar 26, 2019, 7:26 AM

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So, what's the general difference between an attached ChildActor and just having an Actor Set its location based on another?

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Cause when Corrections for my Pawn come in, my Attached CameraActor (via ChildActor) works fine, while the one that just follows via SetActorLocation freaks out

thin stratus Mar 26, 2019, 7:59 AM

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Ha, found the little difference

// We want to tick after the Pawn
if (PawnOwner)
{
    PrimaryActorTick.AddPrerequisite(PawnOwner, PawnOwner->PrimaryActorTick);
}

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Now the custom camera also doesn't hickup anymore when the pawn corrects

thin stratus Mar 26, 2019, 9:07 AM

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Hm, I moved my Speed Boosting code from the BP Pawn to the MovementComponent to have a flag etc. for the SavedMove.
Now I actually wonder how to replicate effects for that. Setting the SpeedBoosting Boolean in BP was done via ServerRPC and the boolean was a RepNotify.
In the MC, the SpeedBoost boolean is a flag that gets ServerRPCd. Is it valid to have a RepNotifiy boolean in a MovementComponent? 🤔

chrome bay Mar 26, 2019, 9:09 AM

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@thin stratus I replicate stuff like that to third-party clients so they can drive FX 😃

thin stratus Mar 26, 2019, 9:10 AM

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Yeah it's mainly for a sound and turning on a particle effect

chrome bay Mar 26, 2019, 9:10 AM

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For my hovertanks I replicated input via the component from the Server so TPP could drive engine sounds/FX etc.

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Update rate is usually good enough to match up to movement

thin stratus Mar 26, 2019, 9:10 AM

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I would combine the OnRep with an ImplementableEvent or a Delegate

chrome bay Mar 26, 2019, 9:10 AM

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Yeah

thin stratus Mar 26, 2019, 9:10 AM

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It feels so annoying that the MovementComp ties so much into the pawn

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I literlaly have a "canSpeedBoost" function in the Pawn that the MovementComp queries

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Cause I don't want Energy in my MovementComp

chrome bay Mar 26, 2019, 9:11 AM

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I know right. I've managed to decouple huge amounts of it in mine but there is some stuff you just can't avoid

thin stratus Mar 26, 2019, 9:12 AM

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I could probably, eventually do that too, but no time. It's working now, despite some minor corrections where I'm really not sure where they come from.
They are also not visible now that the camera is fixed

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So /shrug

chrome bay Mar 26, 2019, 9:12 AM

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haha GG

thin stratus Mar 26, 2019, 9:13 AM

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Hm, would I want to make a second variable just for the OnRep >.>

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I haven't even coded the non-local simulation for clients

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fml

chrome bay Mar 26, 2019, 9:13 AM

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See in mine I've just got it ticking, it just simulates the FX with whatever the latest version of "ReplicatedInput" is

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DW that should be fairly straightforward

thin stratus Mar 26, 2019, 9:14 AM

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Yeah, ReplicatedInput is basically that though

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A Struct with some flags

chrome bay Mar 26, 2019, 9:14 AM

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yeha

thin stratus Mar 26, 2019, 9:14 AM

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I only have the SpeedBoost atm that needs effects

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Jumping and Dashing Downwards works without effects

chrome bay Mar 26, 2019, 9:15 AM

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I guess the SpeedBoost is more of a powerup rather than an input thing then?

thin stratus Mar 26, 2019, 9:15 AM

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Na, it is pressing Shift

chrome bay Mar 26, 2019, 9:15 AM

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Ahhhhh well

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In that case I pack that into my input struct, it's gathered when I consume the movement then

thin stratus Mar 26, 2019, 9:15 AM

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To be fair, the CMC Jump is an upwards speedboost

chrome bay Mar 26, 2019, 9:15 AM

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yeah that's true

thin stratus Mar 26, 2019, 9:15 AM

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If the max hold time wasn't there, it would keep you floating

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Really weird setup

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But I guess for differently high jumps depending on hold time it's cool

gleaming niche Mar 26, 2019, 9:16 AM

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rockman jumping

chrome bay Mar 26, 2019, 9:17 AM

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Thats my hover input struct

📎 Input.JPG

thin stratus Mar 26, 2019, 9:17 AM

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Yeah for me the input works kinda like this:

Client wants to do XY -> Sets Boolean.
Move gets if Boolean is true or false and saves that.
XY Boolean is also parsed into a Flag that gets send to the Server.

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That's basically it

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Ah yeah, it's not all that complicated here

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You can really just imagine a CMC with Hover functionality

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Which.. well the CMC is probably more complicated haha

chrome bay Mar 26, 2019, 9:18 AM

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I think it's because they're looking at how long you held jump etc.. which I don't really care about for mine

thin stratus Mar 26, 2019, 9:19 AM

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Yeah me neither

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We just boost you up once

chrome bay Mar 26, 2019, 9:19 AM

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But yeah I just set the raw input flags from input bindings, then copy that to the simulation input

thin stratus Mar 26, 2019, 9:19 AM

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But we only need the default InputVector that the CMC has.
And then a couple of flags, similar to how the CMC handles jumping.

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That's all, the movement is quite simple.

chrome bay Mar 26, 2019, 9:19 AM

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I also wanted to share netcode between all my movement components so I kind of had to

thin stratus Mar 26, 2019, 9:19 AM

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The math does the hovering and that's it.

chrome bay Mar 26, 2019, 9:19 AM

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yeah

thin stratus Mar 26, 2019, 9:19 AM

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Only thing, hence the question, was how to actually replicate these states back to the clients

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Cause that's nothing the CMC does by default

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But as discussed, an OnRep in the CMC should do that

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Even if it feels somehow overcomplicated with an ImplementableEvent/Delegate combined

chrome bay Mar 26, 2019, 9:20 AM

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For me when the server receives the latest move from the client, it copies the input to the replicated input

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So it just kind of dumbly sends out the latest input (hopefully) around the same time the movement is updated then as well

thin stratus Mar 26, 2019, 9:21 AM

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Yeah in ServerMove or similar I would just use the Uncompressed flag to set the OnRep

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Tbh, if the OnRep callback takes longer for a non-local client -> who cares

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You can play the effects on the local client on button press anyway

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So the delay is kinda unimportant

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I do however find it funny that a simple OnRep->SetMovementSpeed is actually breaking a lot.
You never notice that in BPs cause of the smoothing, but you will trigger tons of corrections

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Cause the delay at a 50-80 ping

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Is high enough for the Server to trigger a correction

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When you start and stop sprinting

chrome bay Mar 26, 2019, 9:23 AM

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Yeah that makes sense

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I haven't had corrections with it being part of the input struct

thin stratus Mar 26, 2019, 9:23 AM

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Yeah I also don't have corrections anymore now that I pass a flag

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I just never noticed until I debugged the drones corrections

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And then I opened a CHaracter and did the same OnRep -> SetMaxWalkSpeed setup