#multiplayer | Unreal Source | Page 605

summer tide Dec 30, 2020, 9:39 AM

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Are you using tiles for your huge world?

worthy knot Dec 30, 2020, 9:39 AM

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im using a height map landscape

summer tide Dec 30, 2020, 9:40 AM

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That's why. Use tiles and have that origin rebase checked.

worthy knot Dec 30, 2020, 9:40 AM

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what do you mean by tiles ?

summer tide Dec 30, 2020, 9:40 AM

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Devs are developing space games with that origin rebase

worthy knot Dec 30, 2020, 9:40 AM

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ohh yeah exactly like no mans sky etc

summer tide Dec 30, 2020, 9:40 AM

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Search for ue4 tiles on youtube.

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NoMansSky uses proprietary game engine.

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So your solution is tiling your landscape. When you export your heightmap you should be able to create tiles. There are other tools that you can use to create tiles from heighmap. You will find many videos on youtube.

worthy knot Dec 30, 2020, 9:43 AM

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so this should solve the "out of world bound issue"?

summer tide Dec 30, 2020, 9:45 AM

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Yes it will.

worthy knot Dec 30, 2020, 9:46 AM

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can you send me a link of tiling your height map in ue4 because when im searching all im getting is "tilling texture"

summer tide Dec 30, 2020, 9:47 AM

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https://www.youtube.com/watch?v=NO_f6uh4e_w

YouTube

Gordon Vart

Create Tiled Heightmap for Unreal Landscape

In this video I show you how to tile a height map so that it can be imported into Unreal Engine as a tiled landscape using world composition.

Gordon's Open Source GitHub
https://github.com/gordon-vart/opensource

Duke's Free Heightmaps
https://forums.unrealengine.com/development-discussion/modding/ark-survival-evolved/92497-duke-s-free-heightm...

▶ Play video

worthy knot Dec 30, 2020, 9:56 AM

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@summer tide i imported a single height map then split it into sub levels , isnt it the same thing as to what he is showing ?

rare cloud Dec 30, 2020, 11:15 AM

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Hey guys, I search an event called client side when you connect to a server

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but I guess I can just execute my code on player controller begin play and check NetMode

winged badger Dec 30, 2020, 11:41 AM

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unless its delayed, you can

faint dock Dec 30, 2020, 3:09 PM

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@summer tide @worthy knot UE5 will support 64bit precision its confirmed
https://youtu.be/RKyyuAhnqP4?t=236

YouTube

Unreal Engine

Learn How to Work With Geospatial Data in Unreal Engine | Webinar

Discover how to use GIS data to create high-quality geographic visualizations and interactive simulations in Unreal Engine.
You’ll learn how to:

Import GIS data using a terrain modeling tool such as Trian3DBuilder
Use Visual Dataprep recipes to optimize and import the data
Embellish your project with 3D trees, a water shader, and more

...

▶ Play video

fringe dove Dec 30, 2020, 5:11 PM

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is there a guaranteed order of onreps and rpcs? which happen first?

rich ridge Dec 30, 2020, 5:20 PM

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It should be serialised as per my understanding because everything happens via single game thread.

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Until you explicitly do multithreading network io

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atleast dedicated servers are 100% single threaded by default. clients have multiple threads.

fringe dove Dec 30, 2020, 8:00 PM

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I'm running into this, in debug builds as they mention, first happens with some unreliable RPCs but eventually with reliable and disconnects the pie instance client.

📎 unknown.png

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how big is the limit? I see enum { RELIABLE_BUFFER = 256 }; // Power of 2 >= 1. ; is that in packets or in bytes?

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and what are the downsides of increasing?

meager spade Dec 30, 2020, 8:13 PM

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why do you need to send so much data reliably?

fringe dove Dec 30, 2020, 8:30 PM

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inputs roughly every frame, for a lockstep and rollback scheme outside of the game framework. I will eventually change it to unreliable only with a manual resend of something that can compress the unacked inputs (based on transitions which are sparse)

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is that a packet limit though?

cursive rivet Dec 30, 2020, 8:42 PM

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Hello, I am having trouble allowing external ips to connect to my game. I have it port-forwarded on 7777. Should my blueprint open the port correctly? I can connect through 127.0.0.1 but not through my ip.

📎 unknown.png

chilly orchid Dec 30, 2020, 8:47 PM

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Been stuck on this for hours im having trouble replicating the animation states in my anim bp it seems to be replicated on the server but for whatever reason it only updates the state on the server to client what im needing is it to go from client to multicast

📎 2020-12-30_13-42-16_Trim.mp4

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i have 2 functions that get called to use the item locally but im a bit lost on how to transfer these functions so the server handles them

📎 unknown.png

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these are the bools that im using to change the state

📎 unknown.png

winged badger Dec 30, 2020, 8:51 PM

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animation blueprints aren't replicated

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you'll need to do your replication in the Pawn, then pull the variables in BlueprintUpdateAnimation

chilly orchid Dec 30, 2020, 8:51 PM

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Sorry I meant relplicating the animation state that the player is in

winged badger Dec 30, 2020, 8:51 PM

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they also can't send RPCs

chilly orchid Dec 30, 2020, 8:53 PM

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That’s what I’ve been doing trying to do the replication in the pawn aka character and setting those bools in my animation graph my issue is it’s only replicating on the server viewport

shut gyro Dec 30, 2020, 8:59 PM

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Is it possible to get the list of all client net connections on the server in a game net driver instance?

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I.E. - is it possible to get from the Gamestate or player states?

rich ridge Dec 30, 2020, 9:14 PM

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cursive rivet Hello, I am having trouble allowing external ips to connect to my game. I have i...

You are using NULL subsystem.
It is only supposed to work within the LAN.
If you want to go beyond LAN you need a good OSS provider like epic online services or steam.

dark edge Dec 30, 2020, 9:17 PM

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chilly orchid That’s what I’ve been doing trying to do the replication in the pawn aka charact...

Have your animation driven by some replicated variables on the pawn, and set those variables on the server-side of the pawn, and they'll replicate out.

kindred widget Dec 30, 2020, 9:18 PM

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@chilly orchid First of all, you're using a Client RPC on input. Input starts on the client. The only RPC you should ever be doing from input is a Server RPC.

dark edge Dec 30, 2020, 9:18 PM

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cursive rivet Hello, I am having trouble allowing external ips to connect to my game. I have i...

You aren't gonna find sessions without an online subsystem but you can just "open IPADDRESS" and it'll work if the port is forwarded for testing

dark edge Dec 30, 2020, 9:19 PM

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chilly orchid these are the bools that im using to change the state

use an enum for weapon state (none, melee, gun, etc)

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also you need to go input -> run on server -> set variable/run on all

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anything state related should use replicated variables and RepNotify if things need to happen when the state changes

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you can even just type it in the console for a quick and dirty test, just like "open 123.456.78.90"

cursive rivet Dec 30, 2020, 9:23 PM

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@dark edge So you saying that even with my current blueprint that open IP:7777 should be working? It is not working

dark edge Dec 30, 2020, 9:25 PM

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You sure you forwarded the ports correctly? You testing on 1 machine or 2?

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also is this PIE or launch game?

cursive rivet Dec 30, 2020, 9:27 PM

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I was using 2 Standalone games and hosted on 1 and tried connecting on the other. I believe i port forwarded correctly, I have port forwarded a few other things and they all worked

normal vault Dec 30, 2020, 9:29 PM

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Have you checked your net is actually cooperatively listening?

cursive rivet Dec 30, 2020, 9:29 PM

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No, how would i do that?

normal vault Dec 30, 2020, 9:31 PM

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Get your hardware info, and google for the admin page, and make sure in your settings you set up port forwarding on the device explicitly

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I cannot tell you how many times I've had things refuse to cooperate, simply because my hardware didn't wanna do it

cursive rivet Dec 30, 2020, 9:33 PM

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Yeah i think it looks good

normal vault Dec 30, 2020, 9:35 PM

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And you're for sure running at least one listen?

cursive rivet Dec 30, 2020, 9:37 PM

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yeah i think

normal vault Dec 30, 2020, 9:38 PM

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I think you can force your editor to run as a listen, and connect via standalone with the client. But, I also think I remember client needing to be built.

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I'd have to refresh my memory a bit, so don't hold anything I'm saying as law

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That may be how it had to work for the steam connection, now that I think about it

cursive rivet Dec 30, 2020, 9:43 PM

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I made it so 1 ran as a listen server and the other ran as a client and it still did not work

chilly orchid Dec 30, 2020, 9:44 PM

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@dark edge the variables are on rep notify ive set this up to run on client and then change the state on the server but i still get the same result what am i missing?

📎 unknown.png

normal vault Dec 30, 2020, 9:45 PM

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@chilly orchid Go watch that video series I shot you. It will teach you how to do all the things you need

chilly orchid Dec 30, 2020, 9:45 PM

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ok i was just trying out the things he suggested

normal vault Dec 30, 2020, 9:46 PM

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@cursive rivet Want to take it to DM and we can trip through the process together?

dark edge Dec 30, 2020, 9:54 PM

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@chilly orchid change the replicated variable on the server

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no need for an Executes on All event

chilly orchid Dec 30, 2020, 10:00 PM

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@dark edge its fixed i had a check in place that prevented the variables from being set

slim matrix Dec 30, 2020, 10:29 PM

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how can i have my UI perform a task on the server so i dont have to create a lot of functions on my player for doing things the Ui is doing

dark edge Dec 30, 2020, 10:30 PM

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@slim matrix you need to do things through something a player owns.

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@slim matrix what kind of things?

slim matrix Dec 30, 2020, 10:33 PM

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like i want a button on my Ui to spawn a actor

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and some modify a targeted actor

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i know to do this in godot you pass the owners network master to the child so you can send RPCs from that child

winged badger Dec 30, 2020, 10:38 PM

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you can only sent a RPC through an owned actor or actorcomponent

clever plinth Dec 30, 2020, 10:44 PM

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Does anyone have an issue where using a repnotify causes an engine crash?

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In v4.26

winged badger Dec 30, 2020, 10:45 PM

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it doesnt

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not by itself

clever plinth Dec 30, 2020, 10:46 PM

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It has a weird trace of unknown functions when I trigger the OnRep

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If I have the variable just replicate, everything is fine

clever plinth Dec 30, 2020, 11:02 PM

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never mind, the stack trace just sucked

unkempt tiger Dec 30, 2020, 11:43 PM

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Is there a nice way to get a player controller from a player state?

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The lack of options in the context menu and preliminary google results makes me question if I even should want to get the player from a player state

winged badger Dec 30, 2020, 11:51 PM

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getowner

harsh fiber Dec 31, 2020, 3:33 AM

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Hey there, I have been banging my head against this for days. I managed to fix the issue. Looks like OSS Steam wont end or destory sessions if you have stats/leaderboard tasks pending. I ripped out a bunch of those calls in PlayerController and that seemed to fix my issues. I can now use the correct end->destroy flow

cedar finch Dec 31, 2020, 5:50 AM

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Is it possible to use the "Set Game Paused" node to pause all players in the game? I'm trying to make it where the host can pause everyone but right now he can only pause himself. I've successfully "faked" it by disabling input for all players which works but I'm curious if it's possible to actually pause all clients. https://i.gyazo.com/bda45c431fc021c189908458fa88f40d.png

clever plinth Dec 31, 2020, 6:05 AM

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@cedar finch u would have to do it manually

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Same with something like slo mo

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Since in every game there are different things the devs will want to stop or slow down

cedar finch Dec 31, 2020, 6:08 AM

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So the node wouldn't work and I should just keep the way I have it where I manually disable all players input and create a widget on their screens?

clever plinth Dec 31, 2020, 6:15 AM

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@cedar finch for the node, I think it’s more of a state thing? I’m not completely sure but I don’t believe that the node works the way u think

cedar finch Dec 31, 2020, 6:17 AM

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It stops the "game time" but only for the host. I was trying to make it stop the game time for everyone. IDK I was just curious

rich ridge Dec 31, 2020, 6:28 AM

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To be honest pause means , pause the entire world.. like I used to pause my Mario video game.

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I don't think UE4 has that kind of capability to pause the world and that too in multiplayer world

hollow eagle Dec 31, 2020, 6:38 AM

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...it absolutely does, "Set Game Paused" is a real function. It stops ticking anything that doesn't explicitly want to be ticked when the game is paused.
It's a local concept though, it wouldn't make sense to automatically pause any connected clients because that may not be the behavior a dev wants. It's up to you to replicate the "pause state" in whatever way you want.

cedar finch Dec 31, 2020, 6:39 AM

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@hollow eagle Yea I know that it doesn't work by default for everyone, I was just curious if it could be replicated to clients somehow

hollow eagle Dec 31, 2020, 6:41 AM

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make your own "pause game" function that sets the pause state and then either:

calls a multicast RPC to pause clients OR
sets a replicated boolean to indicate the pause state, clients should have an OnRep function to react and update their local pause state

cedar finch Dec 31, 2020, 6:52 AM

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I've tried setting a replicated boolean to OnRep and setting "Set Game Paused" to true inside the OnRep function but it still only executes on the Server

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Ahhh I bet you that the host pauses first which then doesn't replicate the boolean to the clients. Let me look into that and see if that's the case

cedar finch Dec 31, 2020, 7:52 AM

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I'll just stick with faking it because I don't think the node works for clients

vital heron Dec 31, 2020, 8:11 AM

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Quick Question: When using a pawn for multiplayer, is calling a RPC each time the player calls the move function the only way of replicating movement or are there other more efficient ways? Also I'm not sure if the current conversation is done and if it's not I'm sorry.

silent valley Dec 31, 2020, 8:15 AM

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Best/easiest way is to use Character Movement Component on the pawn. Writing that yourself is a big job.

vital heron Dec 31, 2020, 8:15 AM

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silent valley Best/easiest way is to use Character Movement Component on the pawn. Writing tha...

You can't. It's a pawn

silent valley Dec 31, 2020, 8:16 AM

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Well can you use a Character instead? Look at the code for CMC - there's a lot more going on that just using RPC.

vital heron Dec 31, 2020, 8:19 AM

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silent valley Well can you use a Character instead? Look at the code for CMC - there's a lot m...

I don't really want to use a character. I like using the pawn a lot. I learnt so much from the pawn and if I used a character I wouldn't know as much as I do now. Also for looking at the code for the CMC, there is just so much going on and it's hard to see the code that I actually need to look at.

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The main part of my question was that when using a pawn, other than just using a RPC to replicate everything, are there other better options to replicate.

silent valley Dec 31, 2020, 8:24 AM

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Ok well you only have RPC or replicated variable. RPC has the least overhead.

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You have to handle throttling yourself though, calling RPC every frame will saturate the network.

vital heron Dec 31, 2020, 8:25 AM

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silent valley You have to handle throttling yourself though, calling RPC every frame will satu...

Yea I'm still thinking on how I want to replicate efficiently.

silent valley Dec 31, 2020, 8:25 AM

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Use the NetQuantize functions to reduce the amount of data you send in the RPC

vital heron Dec 31, 2020, 8:26 AM

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silent valley Use the NetQuantize functions to reduce the amount of data you send in the RPC

I'll look in to that

silent valley Dec 31, 2020, 8:26 AM

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But honestly it's quite a complex problem which is why CMC exists.

vital heron Dec 31, 2020, 8:27 AM

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Yea I know but at least for me it's worth studying and looking into

mighty zinc Dec 31, 2020, 8:27 AM

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Cmc has quite alot of code

vital heron Dec 31, 2020, 8:27 AM

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I have learnt so much so far and I don't want all my hard work to go to waste

mighty zinc Dec 31, 2020, 8:27 AM

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All the client side prediction is done there

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@SalDaPotato I've done quite some research on cmcs

vital heron Dec 31, 2020, 8:27 AM

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mighty zinc @SalDaPotato I've done quite some research on cmcs

Really?

mighty zinc Dec 31, 2020, 8:28 AM

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I can recommend u some tutorials if u want

vital heron Dec 31, 2020, 8:28 AM

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mighty zinc I can recommend u some tutorials if u want

Oh please do! All help is appreciated!

mighty zinc Dec 31, 2020, 8:29 AM

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https://youtu.be/Of8SGBa3WvU

YouTube

SabreDartStudios

UE4 Custom CharacterMovementComponent - C++

In this video I show the proper way to make movement abilities for your characters. This is done by creating a Custom CharacterMovementComponent.

We start from scratch with a third person BP project, but here is the completed project you can copy code from: https://drive.google.com/open?id=1w9mMlKlcFhTrr8wsf1_76h_4v_k2ysei

▶ Play video

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This is like an extension of that

vital heron Dec 31, 2020, 8:29 AM

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I've always been curious about CMC but there is just so much code that it's hard to find the exact parts I want so I basically just gave up on that

mighty zinc Dec 31, 2020, 8:29 AM

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Also read about client side prediction

vital heron Dec 31, 2020, 8:30 AM

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mighty zinc Also read about client side prediction

Yea I found a GREAT article on CSP

mighty zinc Dec 31, 2020, 8:30 AM

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I was trying to make a custom cmc

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From scratch

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Didn't make much progress tho

vital heron Dec 31, 2020, 8:30 AM

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I understand the concept but I'm still trying to get my head around getting and storing other player's movement to predict

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How far did you get?

mighty zinc Dec 31, 2020, 8:31 AM

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I had to do some other stuff

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But from what i understand

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They store all the inputs and send them together on ticks

vital heron Dec 31, 2020, 8:32 AM

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mighty zinc They store all the inputs and send them together on ticks

Oh I see

mighty zinc Dec 31, 2020, 8:33 AM

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The savedmovestruct

vital heron Dec 31, 2020, 8:33 AM

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mighty zinc The savedmovestruct

?

mighty zinc Dec 31, 2020, 8:33 AM

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Contains all info

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And moves are stored in another struct

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An array of acknowledged and non acknowledged moves

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What do you mean?

vital heron Dec 31, 2020, 8:35 AM

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Explained it horribly

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Let me try to explain it better

mighty zinc Dec 31, 2020, 8:36 AM

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Server replicates the struct to all clients

vital heron Dec 31, 2020, 8:36 AM

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So the struct contains all the player's locations?

mighty zinc Dec 31, 2020, 8:36 AM

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Wait lemme just show u

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Dm?

vital heron Dec 31, 2020, 8:37 AM

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Yea I've been looking for source code to get a better idea about it

vital heron Dec 31, 2020, 8:37 AM

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mighty zinc Dm?

Sure

errant lance Dec 31, 2020, 8:55 AM

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Epic has good documentation of what cmc does, https://docs.unrealengine.com/en-US/InteractiveExperiences/Networking/CharacterMovementComponent/index.html

Character Movement Component

Detailed explanation of Character Movement Component

dull magnet Dec 31, 2020, 9:01 AM

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Anyone know if it is common for BPs to break when switching event replication method? (multicast / client etc.) Just updated to 4.26 and seems like some events gets stuck on old replication method when changed.

chrome bay Dec 31, 2020, 10:34 AM

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The Server doesn't replicate the stored moves to clients - the moves are stored on the local controlling client.

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The Server just replicates the standard actor Replicated Movement for other clients. Those clients then smooth those updates themselves locally.

blissful remnant Dec 31, 2020, 11:08 AM

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Hey! Does anyone knows how can I get the Steam nickname from the user's UniqueNetId? I'm using beacons so getting it from PlayerState is not an option.

rich ridge Dec 31, 2020, 11:12 AM

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@blissful remnant let me give you few examples on how to do it.

Whenever player joins the server , server receives the player id, use that id and let your server hit the steam backend via steam OSS and fetch player name and set it to PlayerState.
Whenever a player is about to join a server , player knows it's nickname but server doesn't, so in the join session append player's nickname as query and server will filter that query.

blissful remnant Dec 31, 2020, 11:16 AM

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@rich ridge This is exactly what I'm struggling with. How can I query the steam backend? I thought that the Identity Interface is the one I need. It has a GetPlayerNickname function but it always returns my own nickname

rich ridge Dec 31, 2020, 11:16 AM

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you need to pass the other player's id

blissful remnant Dec 31, 2020, 11:17 AM

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and that's what I did 😉

rich ridge Dec 31, 2020, 11:17 AM

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i think you need to use IOnlineUser interface and query user.

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not identity

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identity interface is for self player.

blissful remnant Dec 31, 2020, 11:18 AM

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alright, I'm gonna give it a shot, thanks for the help! 💕

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it seems like the User Interface has no Steam implementation though, only Facebook and Tencent

rich ridge Dec 31, 2020, 11:22 AM

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which plugin are you using?

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Advanced-Steam-Session?

blissful remnant Dec 31, 2020, 11:22 AM

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I'm writing my own 😅

rich ridge Dec 31, 2020, 11:23 AM

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then you need to write that

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have you tried Epic Online Services

blissful remnant Dec 31, 2020, 11:23 AM

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I'm aiming for Steam specifically

rich ridge Dec 31, 2020, 11:24 AM

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https://github.com/EpicGames/UnrealEngine/tree/master/Engine/Plugins/Online/OnlineSubsystemEOS

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ok

rich ridge Dec 31, 2020, 11:24 AM

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blissful remnant I'm aiming for Steam specifically

means you are comfortable with 30% revenue cut.

blissful remnant Dec 31, 2020, 11:26 AM

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I'd like to release this plugin on the Marketplace, Steam matchmaking and lobby system/framework

rich ridge Dec 31, 2020, 11:26 AM

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ohhh i see

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why don't to have a look on Epic EOS plugin and understand the concepts and then work on your plugin

blissful remnant Dec 31, 2020, 11:29 AM

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at this point I feel like I'm good, been working on this plugin for a while now, it's just that up until this point, the player name was always available in the PlayerState

rich ridge Dec 31, 2020, 11:30 AM

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once a player does the client Travel, a new PlayerState is created for him

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and in that the setting up of nickname is responsibility of server ... and the OSS is not responsible for this

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its the game developer who have to set name post client travel.

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and there are many ways to set the name post travel.

blissful remnant Dec 31, 2020, 11:32 AM

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I'm using beacons to create a party before starting matchmaking, that's why I don't have (direct) access to the player names

rich ridge Dec 31, 2020, 11:32 AM

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but when you do client travel the beacon connection is lost

blissful remnant Dec 31, 2020, 11:32 AM

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a workaround would be to ClientRPC to the connecting client's beacon, gather data locally and send it back to the server

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I'm not traveling anywhere, beacons handle the connection between each other, no need to open a listen server

rich ridge Dec 31, 2020, 11:34 AM

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i strongly believe you should not be worried about setting nickname in PlayerState. because most of the game developers do override the default behavior in GameMode

blissful remnant Dec 31, 2020, 11:35 AM

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i don't want to set the playername, just read it. Should we take this to private chat? I feel like we are just spamming the channel for no good reason

rich ridge Dec 31, 2020, 11:36 AM

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ok

twin juniper Dec 31, 2020, 12:30 PM

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Using c++ if I call a non rpc function inside a server rpc does it run on server too?

kindred widget Dec 31, 2020, 12:32 PM

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RPC is just to move from machine to machine. So if you called a Server RPC, and then called more functions after that, all of those functions after the server RPC will run on the server until you call another RPC.

twin juniper Dec 31, 2020, 12:39 PM

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So if I call a multicast rpc and then outside I call non rpc functions they'll all run on NetMulticast?

weary badge Dec 31, 2020, 12:41 PM

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Hey everyone,

For some reason, when I connect the Player on the top right screen, it shows a client value of -1.
Is there any further meaning behind this ?

📎 unknown.png

kindred widget Dec 31, 2020, 12:44 PM

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@twin juniper Think of RPC as a simple way to "Send Execution to this machine." So if you multicast an RPC, you're telling the logic to move from the server version of this replicated object to all versions of the replicated object.

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@weary badge Haha, that's odd. I've never seen that one. Is that the blueprint PrintString?

weary badge Dec 31, 2020, 12:46 PM

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Yeah

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I have 2 possibilities in mind

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1: The top right is the server, so technically ID 0, but since it's not hosting, but another client is, it gets -1
2: It wants to give ID4, but since there can only be up to 3, it gets -1

kindred widget Dec 31, 2020, 12:49 PM

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It should print Server if it's the server though.

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The switch for that is just this.

switch(World->GetNetMode())
{
case NM_Client:
  Prefix = FString::Printf(TEXT("Client %d: "), GPlayInEditorID - 1);
  break;
case NM_DedicatedServer:
case NM_ListenServer:
  Prefix = FString::Printf(TEXT("Server: "));
}```

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And GPlayInEditorID defaults at -1, so it has to be 0 when this is printed.

weary badge Dec 31, 2020, 12:52 PM

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mhm
Can you explain it a bit differently ?
I've only learned UE for about 2 months in total (and blueprints only)

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Sorry 😫

kindred widget Dec 31, 2020, 12:57 PM

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@weary badge How are you testing the print?

weary badge Dec 31, 2020, 12:57 PM

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📎 unknown.png

kindred widget Dec 31, 2020, 1:00 PM

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Is this a Listenserver setup?

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If it's a listenserver, then that's really odd. I've never seen that before. Even on Owning Client RPCs, server should print Server: 3 on a listenserver setup.

weary badge Dec 31, 2020, 1:05 PM

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Should be

📎 unknown.png

kindred widget Dec 31, 2020, 1:07 PM

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That's odd behavior. How are you calling the Owning Client RPC?

weary badge Dec 31, 2020, 1:11 PM

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📎 unknown.png

steel fox Dec 31, 2020, 1:37 PM

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How many games use listen servers? Is it a bad idea for games like shooters or racing?

silent valley Dec 31, 2020, 1:40 PM

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Anything competitive is usually bad idea due to potential cheating. But many games run listen servers just fine.

gloomy sedge Dec 31, 2020, 3:05 PM

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Hi, I have a very weird thing happening when using dedi servers, The character is very jittery when running, but doesn't do it when using the Stat Net command

📎 2020-12-31_15-03-45.mkv

winged badger Dec 31, 2020, 3:08 PM

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net.showcorrections

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the jitter usually comes from speed not being synced across server/clients

gloomy sedge Dec 31, 2020, 3:14 PM

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hmm, accoring to the print string, the client and server both display the same speed

winged badger Dec 31, 2020, 3:22 PM

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replicated scene components, especially skeletal mesh

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can cause trouble as well

meager spade Dec 31, 2020, 3:43 PM

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that is skeletal mesh rep issue

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or very very similar

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@gloomy sedge do you have Component Replicates ticked on your skeletal mesh of the player?

gloomy sedge Dec 31, 2020, 3:44 PM

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yeah I did, turned it off and it seems to have worked!

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thanks!

meager spade Dec 31, 2020, 3:44 PM

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yeah common mistake people make

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i could tell that was the issue 😄

winged badger Dec 31, 2020, 3:49 PM

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he did say while running, so speed mismatch was my first guess

meager spade Dec 31, 2020, 3:49 PM

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ye but i could see the skel mesh was moving back

winged badger Dec 31, 2020, 3:51 PM

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ah, i didn't watch the video 😄

meager spade Dec 31, 2020, 3:55 PM

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lol

twin juniper Dec 31, 2020, 4:28 PM

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Hi, I've started a multiplayer project but a i have a problem and i'm still stuck since few days.
I want to show steam name at top of the character for all client connected to the session, only the person who host the
session have the right name at top of the right character (player), others client have them name at top of the all player or
no name appeared. My current blueprint (cf. screen) can do this, i don't know where is the problem.
Does my event has the wrong replicate option ?
Event is called when the player is crerated on the level and send it to all client that a player just join
(Print string is just for a debug), btw, tell me if this message is in the wrong channel.
https://cdn.discordapp.com/attachments/391885524308197386/794168215085252648/unknown.png

rich ridge Dec 31, 2020, 4:45 PM

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@twin juniper if you are using listen server, host player showing its name is reasonable. but other others who joined your host actually left their system and joined the host's system. and host's system doesn't know the names of the joining players.

you overcome this problem, you can do either of two things.

let your host fetch the player name using IOnlineUser interface.
2.let your player's carry their name to the host server.

twin juniper Dec 31, 2020, 4:47 PM

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Okey, i got it i think, let me try

rich ridge Dec 31, 2020, 4:48 PM

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ideally when a player joins the session or host, host should set the player nick name in PlayerState, and that nickname variable is replicated to all clients if i remember correctly.

twin juniper Dec 31, 2020, 4:49 PM

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So I have to put steam name in PlayerState ?

rich ridge Dec 31, 2020, 4:50 PM

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yes

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for the time being this is how I m doing it

open ip:port?NickName=Player1

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and server retrieves this query and set it and its replicated to all clients.

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ohh wait

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open ip:port?Name=Player1

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this will forward the player name to host server

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{
    check(NewPlayerController);

    // The player needs a PlayerState to register successfully
    if (NewPlayerController->PlayerState == nullptr)
    {
        return FString(TEXT("PlayerState is null"));
    }

    FString ErrorMessage;

    // Register the player with the session
    GameSession->RegisterPlayer(NewPlayerController, UniqueId.GetUniqueNetId(), UGameplayStatics::HasOption(Options, TEXT("bIsFromInvite")));

    // Find a starting spot
    AActor* const StartSpot = FindPlayerStart(NewPlayerController, Portal);
    if (StartSpot != nullptr)
    {
        // Set the player controller / camera in this new location
        FRotator InitialControllerRot = StartSpot->GetActorRotation();
        InitialControllerRot.Roll = 0.f;
        NewPlayerController->SetInitialLocationAndRotation(StartSpot->GetActorLocation(), InitialControllerRot);
        NewPlayerController->StartSpot = StartSpot;
    }
    else
    {
        ErrorMessage = FString::Printf(TEXT("Failed to find PlayerStart"));
    }

    // Set up spectating
    bool bSpectator = FCString::Stricmp(*UGameplayStatics::ParseOption(Options, TEXT("SpectatorOnly")), TEXT("1")) == 0;
    if (bSpectator || MustSpectate(NewPlayerController))
    {
        NewPlayerController->StartSpectatingOnly();
    }

    // Init player's name
    FString InName = UGameplayStatics::ParseOption(Options, TEXT("Name")).Left(20);
    if (InName.IsEmpty())
    {
        InName = FString::Printf(TEXT("%s%i"), *DefaultPlayerName.ToString(), NewPlayerController->PlayerState->GetPlayerId());
    }

    ChangeName(NewPlayerController, InName, false);

    return ErrorMessage;
}```

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respective code to retrieve Name and set it in playerstate

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this is built in engine

winged badger Dec 31, 2020, 5:04 PM

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well, with steam you'll more likely want open steam.ID

rich ridge Dec 31, 2020, 5:05 PM

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ohh i see

slim matrix Dec 31, 2020, 5:06 PM

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why is it that if the server tells everyone to set an objects max draw distance it only happens to the server and all clients draw distance remains 0

winged badger Dec 31, 2020, 5:11 PM

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why is the server communicating max draw distance to clients?

slim matrix Dec 31, 2020, 5:14 PM

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I added a mesh component to an actor

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At runtime

summer tide Dec 31, 2020, 8:24 PM

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If I do this, in my player controller for client I get ERROR. BAD UNIQUE NET ID
https://gyazo.com/9accf692fc94b96b54479ef413f2aa44

Gyazo

clever plinth Dec 31, 2020, 8:25 PM

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Do delegates replicate by default?

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@summer tide The player needs to be signed in before the Unique net id is valid

summer tide Dec 31, 2020, 8:26 PM

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I see that in lobby after client accepting host's invitation.

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Host and client both are in lobby

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I only see host's player name and net id but not clients'

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@clever plinth

clever plinth Dec 31, 2020, 8:28 PM

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From a client?

summer tide Dec 31, 2020, 8:29 PM

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What do you mean?

lost inlet Dec 31, 2020, 10:10 PM

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why would a delegate be replicated

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ESPECIALLY by default

gleaming vector Dec 31, 2020, 10:45 PM

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delegates are not replicated

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ever

summer tide Dec 31, 2020, 10:47 PM

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Ok thanks

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So to go from to lobby to game level. Should I use openLevel or server command?

gleaming vector Dec 31, 2020, 10:49 PM

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ServerTravel on the server

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that will take clients with it

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there is a documentation page about this, one sec

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

Travelling in Multiplayer

An overview of how travelling works in multiplayer.

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if you are a client trying to join a server, open <ip> to get you onto the server and into the level

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if you are a server attempting to go from one map to another, you want ServerTravel() to move to maps

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if seamless travel is enabled, it'll bring all clients with you

meager spade Dec 31, 2020, 11:05 PM

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Depends on your game, in games like batte royale, they just load you into the map, in a starting area, then transition you to the main area once the game has started, no server travelling (this is what i heard on UDN about how they do it in Fortnite)

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as there is no need to server travel, the party exists in the main menu, not in a lobby map

summer tide Dec 31, 2020, 11:16 PM

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SO I tried to use Execute Server command with "servertravel" and I have my lobby game-mode set to seamless travel. But didn't work in packaged game.

lost inlet Dec 31, 2020, 11:19 PM

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you'll have to be more precise than "didn't work"

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and if it didn't work in packaged specifically, then that can because you didn't cook the map

summer tide Dec 31, 2020, 11:36 PM

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lol - i think that's it. Since I was trying that on a test level.

kindred widget Jan 1, 2021, 12:27 AM

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I'm having some trouble... I have a very simple GameState that inherits from GameStateBase, a GameMode that inherits from GameModeBase. If I set the GameState to the default GameStateBase, everything works fine and I can see each client running around. But if I set it to the inherited GameState, suddenly clients are unable to input and cannot see server move, like it's net saturated or something.

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Oh. Dur. Nevermind... Forgetting the Super in GetLifetimeReplicatedProps again. Hurdur.

clever plinth Jan 1, 2021, 12:44 AM

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lost inlet why would a delegate be replicated

Alright, just making sure

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I meant something else, misworded it

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I found out anyway 😉

kindred widget Jan 1, 2021, 1:01 AM

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Hmm... If I have an empty AActor, do I need to do anything except set bReplicates = true; in the constructor for it to also spawn on clients? I'm used to doing this in blueprint where I just create a new class from actor and check Replicates true.

fossil spoke Jan 1, 2021, 1:02 AM

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Thats correct.

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Under the assumption your spawning it on the Server.

meager spade Jan 1, 2021, 1:02 AM

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or its pre-placed in level

kindred widget Jan 1, 2021, 1:04 AM

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Spawning it from the server side of my GameState's beginplay. Definitely working on the server, because the Beginplay of the actor is supposed to print. It's printing on the server, never on the client. I do the exact same thing in blueprint, which is leading me to believe it's not getting replicated for some reason. :/

clever plinth Jan 1, 2021, 1:06 AM

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@kindred widget if ur spawning it on the server and replicating it to the clients, the beginplay should only be called on the server

kindred widget Jan 1, 2021, 1:06 AM

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That has not been my experience. Beginplay is usually called when it's ready for play on each machine if I'm not mistaken? Does C++ handle that differently than blueprint?

fossil spoke Jan 1, 2021, 1:08 AM

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@clever plinth That is not correct.

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@kindred widget You are right.

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An Actor has BeginPlay called when it is spawned within the world, regardless of the network context.

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This behavior is also present during Network Relevancy as the Actor becomes Relevant again to a particular Client.

sonic jasper Jan 1, 2021, 1:09 AM

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Can anyone think of a reason why when a client joins the listen server (host) loses its umg display?
I am using PossessedBy (for host) and OnRep_PlayerState (clients) to add ui to playercontroller. Seems to disappear at point the client spawns.

fossil spoke Jan 1, 2021, 1:10 AM

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Why arent you initializing the UI when the HUD class is spawned?

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The HUD class is setup on Clients after the PlayerController has finished initialization.

lost inlet Jan 1, 2021, 1:11 AM

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to me the HUD class makes sense as a generic UI manager and that's what we do with our game

fossil spoke Jan 1, 2021, 1:11 AM

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Same

sonic jasper Jan 1, 2021, 1:12 AM

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yeah ok. will try moving it to there, was setting up gameplay abilities, just used the way it was done in the example project

fossil spoke Jan 1, 2021, 1:13 AM

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Most example projects are pretty terrible... lol

sonic jasper Jan 1, 2021, 1:13 AM

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well i will let UkaosSpectrum respond to that think its his lol

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so best way is to create a child of hud class and just call the widget creation in there?

meager spade Jan 1, 2021, 1:15 AM

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what's mine

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lol

sonic jasper Jan 1, 2021, 1:15 AM

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did u do GASShooter?

meager spade Jan 1, 2021, 1:16 AM

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GASShooter? i only helped on some concepts in there, the rest of it was Dan (Tranek)

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mainly regarding tasks and weapons

clever plinth Jan 1, 2021, 1:17 AM

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fossil spoke <@!578668767316410371> That is not correct.

My bad! 😬

kindred widget Jan 1, 2021, 1:17 AM

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So.. How is relevancy figured out? I've narrowed it down to the fact that my C++ actor isn't relevant to the client. I'm presuming offhand that this is because blueprint adds a default SceneComponent to their actors?

clever plinth Jan 1, 2021, 1:17 AM

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I’m still sorta a noob so I assume some things I shouldn’t

meager spade Jan 1, 2021, 1:17 AM

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relevancy is done by distance

fossil spoke Jan 1, 2021, 1:17 AM

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Relevancy is distance based.

serene berry Jan 1, 2021, 1:18 AM

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I am trying to convert the top down example to multiplayer and get movement on the client. My first thought was to use a RPC call for right-click -> SimpleMoveToLocation. The RPC doc says that I should be using RPCs for unreliable/cosmetic things. Is there something else I should be using?

kindred widget Jan 1, 2021, 1:18 AM

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🤷‍♂️ Need it all the time anyhow, so AlwaysRelevant it is.

meager spade Jan 1, 2021, 1:18 AM

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what doc's are you reading?

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cause i will shoot the creator 😄

sonic jasper Jan 1, 2021, 1:19 AM

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no worries i dont know ppls real names so assumed, either way it works in that example which i am using but mine doesnt for whatever reason

meager spade Jan 1, 2021, 1:19 AM

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loads his virtual gun...

kindred widget Jan 1, 2021, 1:19 AM

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Watsuby, or me?

meager spade Jan 1, 2021, 1:19 AM

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@sonic jasper i do all UI through AHUD derived class

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its Local only, and it makes sense

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i say all UI, in game UI

sonic jasper Jan 1, 2021, 1:20 AM

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yeah changing it up now, cheers

meager spade Jan 1, 2021, 1:20 AM

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Watsuby

serene berry Jan 1, 2021, 1:20 AM

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meager spade what doc's are you reading?

if you meant me, i was using the ue4 doc https://docs.unrealengine.com/en-US/InteractiveExperiences/Networking/Actors/RPCs/index.html

RPCs

Designating function replication across the network

meager spade Jan 1, 2021, 1:20 AM

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man that doc is terrible

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there are 2 types of RPC, Reliable and Unreliable

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now, what one to use is dependant

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Reliable is guarenteed to go through, so use that for things that MUST happen

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mostly all cosmetic non important gameplay stuff should be done via Unreliable RPC's

kindred widget Jan 1, 2021, 1:21 AM

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The table in it is nice. Helped me along a lot when I first started messing with networking.

meager spade Jan 1, 2021, 1:22 AM

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another reliable option is a Replicated property, but you have to wait for the actor to replicate, which is based on its frequency, but if something must happen quickly then a RPC is the way to go

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BTW moving a player on the server only, if its a sorta fast paced game, would be really horrible

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we had that when we first started on our top down game, i soon changed it to be local navmesh movemnt

kindred widget Jan 1, 2021, 1:24 AM

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Had to confirm just for curiosity, it was the default scene component that blueprint adds. But that's alright, AlwaysRelevant works for my needs anyhow.

serene berry Jan 1, 2021, 1:24 AM

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if you have local navmesh movement, is there more work to be done so that the server can correct things if things start to go awry?

meager spade Jan 1, 2021, 1:25 AM

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it uses the CMC

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player clicks, path following sends path to the CMC, and it works just like player pressing input keys (W-A-S-D)

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so all corrections etc work just like normal

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though we get none, cause they hardly ever go wrong

serene berry Jan 1, 2021, 1:26 AM

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okay thats pretty smart

kind ember Jan 1, 2021, 1:32 AM

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Is there a DOREPLIFETIME_CONDITION to replicates only to an array of actor's owner and can it be change in run time? Or how can this be achieve?

meager spade Jan 1, 2021, 1:34 AM

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eh?

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array of actor's owner?

kindred widget Jan 1, 2021, 1:35 AM

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I think he wants to keep a list of actors, and replicate something to the owning client of them? If I read that correctly.

meager spade Jan 1, 2021, 1:35 AM

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yeah that is not something i have ever seen nor do i think its possible if that is the case

kind ember Jan 1, 2021, 1:37 AM

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Let say I want to replicate a variable to only specific set of UNETCONNECTION that own's this actor,

kindred widget Jan 1, 2021, 1:38 AM

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Well, replicating to owner only is just a setting.

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You probably set that when you do the macro to register the property for replication.

kind ember Jan 1, 2021, 1:39 AM

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It must be replicate to other players as well but not all, for example a string for group chat

kindred widget Jan 1, 2021, 1:41 AM

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Not sure if you can selectively choose which clients to replicate to besides for things like OwnerOnly, or SkipOwner. Kaos might know better on that one.

kind ember Jan 1, 2021, 1:42 AM

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Yea I have a feeling so, I've looked at those macro already, I'm gonna use NetMultiCast unreliable to send them to specific players with timer

sonic jasper Jan 1, 2021, 1:59 AM

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where u call the widget creation in HUD class, DrawHud?

kindred widget Jan 1, 2021, 2:02 AM

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For creating a UUserWidget?

sonic jasper Jan 1, 2021, 2:03 AM

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yeah

kindred widget Jan 1, 2021, 2:05 AM

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DrawHud is a specialized tick for the HUD class to do some... drawing things. You can create it anywhere. Beginplay, etc. I tend to make specific calls for my different main widgets, which runs a macro to check if the widget has already been created, if it exists, put it on screen or remove it from screen, if it doesn't exist, create and it and add it to screen.

sonic jasper Jan 1, 2021, 2:10 AM

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i still have same issue of hud being removed on host

kindred widget Jan 1, 2021, 2:11 AM

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Networking shouldn't have any bearing on user interface.

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void ACHUD::ToggleInventoryWidget()
{
    if (CheckWidgetCreated(InventoryWidget, InventoryWidgetClass))
    {
        if (InventoryWidget->IsInViewport())
        {
            InventoryWidget->RemoveFromParent();
        }
        else
        {
            InventoryWidget->AddToViewport();
        }
    }
}

bool ACHUD::CheckWidgetCreated(UUserWidget*& Widget, TSubclassOf<UUserWidget> WidgetClass)
{
    if (Widget)
    {
        return true;
    }
    else if (WidgetClass)
    {
        Widget = CreateWidget<UUserWidget>(GetWorld(), WidgetClass);
        if (Widget)
        {
            return true;
        }
    }
    return false;
}```

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I do most of my UI opening like this. ToggleInventoryWidget() getting called from a keypress. Can also be used in Beginplay, or where ever of the HUD class.

sonic jasper Jan 1, 2021, 2:18 AM

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yeah ok so ur not creating the widget on the playercontroller, actually on the hud class

peak sentinel Jan 1, 2021, 2:19 AM

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kindred widget I do most of my UI opening like this. ToggleInventoryWidget() getting called fro...

Its off topic but, just out of curiosity, what kind of game are you working on?

kindred widget Jan 1, 2021, 2:21 AM

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@sonic jasper Usually, yeah. All of my major widgets get created through that CheckWidgetCreated macro. I use the variables like InventoryWidgetClass which would be a TSubclassOf<UUserWidget> in the header to pick the widget from the blueprint version of the HUD. Other more obscure, smaller widgets are either created inside of other widgets and used in them, or usually in WidgetComponents in actors.

sonic jasper Jan 1, 2021, 2:22 AM

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yeah thats the setup i am using was just on the PC

kindred widget Jan 1, 2021, 2:24 AM

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@peak sentinel Nothing professional unfortunately. I have a few hobby projects I bounce around. Two are RTS, the one I'm working on at the moment is a small coop game I'm trying to make for my wife. She likes Ark, and City builders, so I figured why not a city builder, in the style of a survival game. 🤷‍♂️

sonic jasper Jan 1, 2021, 2:25 AM

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how come u have InventoryWidget as a point to a reference there?

kindred widget Jan 1, 2021, 2:25 AM

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In the CheckWidgetCreated?

sonic jasper Jan 1, 2021, 2:25 AM

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yeah

kindred widget Jan 1, 2021, 2:26 AM

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So that if the pointer comes back invalid, it can set it in the Else If part.

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No need to send the pointer back out to set it.

peak sentinel Jan 1, 2021, 2:26 AM

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kindred widget <@!748517221608980631> Nothing professional unfortunately. I have a few hobby pr...

I see, good luck then, keep up the good work 👌 👍

kindred widget Jan 1, 2021, 2:28 AM

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CreateWidget returns the created widget, so passing in the pointer by ref allows you to set it inside of the function. That way the next time it's ran, the pointer would be populated. I started doing my UI like this so that if for any reason I needed to refresh the whole UI screen, I could bomb all widgets by removing them from screen, nulling out the references, and then letting my logic rebuild them. Just a precaution.

sonic jasper Jan 1, 2021, 2:28 AM

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so declared like UUserWidget*& InventoryWidget ?

kindred widget Jan 1, 2021, 2:29 AM

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Nah, Just UUserWidget* InventoryWidget, the & is only in the CheckWidgetCreated function to pass that pointer by ref.

sonic jasper Jan 1, 2021, 2:30 AM

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but you accessing InventoryWidget.RemoveFromParent() like a ref

kindred widget Jan 1, 2021, 2:30 AM

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Oh, whoops. That's what I get for writing that too fast.

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Supposed to be ->

sonic jasper Jan 1, 2021, 2:31 AM

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yeah sweet, thought i was going mad then

kindred widget Jan 1, 2021, 2:31 AM

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There, fixed that.

sonic jasper Jan 1, 2021, 2:32 AM

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typo in TSublcassOf if u really care lol, quick typing to type that out

clever plinth Jan 1, 2021, 2:33 AM

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I'm using a net multicast function, however it's only updating things on the client who called it. Is there a way to trigger a function that is called on all Clients?

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I'm making a killfeed btw

fossil spoke Jan 1, 2021, 2:34 AM

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Your not calling it on the Server if its only being applied to the Client

sonic jasper Jan 1, 2021, 2:37 AM

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that doesnt work at all for me

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or have i not set the class

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i have not

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ok so i have a more streamlined hud creation

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back to why it disappears lol

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going to have to strip down my game mode i think

kindred widget Jan 1, 2021, 2:39 AM

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It only disappears on the Listenserver host?

sonic jasper Jan 1, 2021, 2:39 AM

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something is destroying the host display

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yeah only the listen server

kindred widget Jan 1, 2021, 2:39 AM

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What originally calls the function to add it to screen?

sonic jasper Jan 1, 2021, 2:40 AM

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what u just sent me

📎 unknown.png

kindred widget Jan 1, 2021, 2:42 AM

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Does it disappear immediately? Do you see it at all, is it just a flash, or does it happen after a second or two?

sonic jasper Jan 1, 2021, 2:42 AM

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is there when the host spawns

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as soon as a client spawns it disapears

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i have checked the host isnt restarted/reset

kindred widget Jan 1, 2021, 2:43 AM

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Is the widget itself doing any sort of checks, or removing itself from parent?

summer tide Jan 1, 2021, 2:43 AM

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I know I asked this question before but still having troublehooting it. Has anyone tried saving and loading a steam multiplayer game? My client loses connection when I try to load the game from lobby.

sonic jasper Jan 1, 2021, 2:45 AM

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i dont have any funcs to remove any ui atm

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there is some visibility stuff for sections of it but i have it all on atm

kindred widget Jan 1, 2021, 2:46 AM

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That's odd behavior. ACHud is a class inheriting from AHUD, and you've set it to that class in your GameMode?

sonic jasper Jan 1, 2021, 2:46 AM

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yep

kindred widget Jan 1, 2021, 2:46 AM

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And nothing else at all, anywhere, is spawning this widget to screen?

sonic jasper Jan 1, 2021, 2:47 AM

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has to be something intialising on the server hey

kindred widget Jan 1, 2021, 2:48 AM

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The thing is that HUD isn't networked. It's beginplay only runs once on each machine, independently. So no networking should affect this.

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Does this still happen if you play as listenserver and only 1 machine? IE just the listenserver? Does the widget go away after a bit?

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If the answer is no, then I'm willing to bet you have some sort of call to remove all widgets from screen or something, somewhere that's causing the host to lose it's widgets.

sonic jasper Jan 1, 2021, 2:50 AM

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no it stays

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yeah, has to be a removeall executing under HasAuthority somewhere

meager spade Jan 1, 2021, 4:01 AM

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@clever plinth your kill feed text should come from the server when the actor is killed, this should be done in your PlayerKilled function on your player which is run on the server, in my game i send it out via the GameState

clever plinth Jan 1, 2021, 4:10 AM

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Yeah, I got it after thinking a while

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XD

sonic jasper Jan 1, 2021, 7:37 AM

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@kindred widget i gave up in the end, ended up rolling back a couple of updates and its working again now. No idea what caused it im afraid. Thanks for ur help and the HUD setup.

summer tide Jan 1, 2021, 8:00 AM

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What's the efficient way to replicate this movement? https://gyazo.com/7c012f206f25f818fb75f175aea65658

Gyazo

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https://gyazo.com/45f2d81f26448b50c5bd0ceb0a2d5f83

Gyazo

twin juniper Jan 1, 2021, 2:08 PM

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Hi, I have a server RPC(cpp) that spawns an actor in the world and keeps its reference in a replicated variable, before spawning it I check if there is already another actor referenced, and if there is I destroy it(actor_reference->Destroy()), on Client the actor won't destroy and I can't understand why, can someone help?

dry zodiac Jan 1, 2021, 3:06 PM

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Hey guys, I am a newbie about dedicated servers. So my question can be very basic, sorry for that.
How can I send any gameplay data from client to dedicated server? With Http request or REST or etc? How can I handle this?
I am a little bit familiar with database systems with json but I'm sure gameplay side will be very different. Thanks!

rich ridge Jan 1, 2021, 3:18 PM

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@twin juniper Can you try this approach, on server -> Get all actors of class (Get the actors list which you want to spawn), if actor already exists on server you will get non-empty list and then iterate over the list and destroy on server.

twin juniper Jan 1, 2021, 3:36 PM

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rich ridge <@456226577798135808> Can you try this approach, on server -> Get all actors of ...

Why should I do this while Destroy is already running on server(I call it inside a server rpc) and I already have a reference exactly to the actor I want to destroy? What if I want to destroy the actor of only one Player in the level and multiple Player have the same actor spawned?

rich ridge Jan 1, 2021, 3:45 PM

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From server you can't destroy an actor only for one client. If you destroy actor it will be destroyed for all.

rich ridge Jan 1, 2021, 3:47 PM

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dry zodiac Hey guys, I am a newbie about dedicated servers. So my question can be very basi...

You should learn more about RPCs.

dry zodiac Jan 1, 2021, 3:52 PM

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rich ridge You should learn more about RPCs.

I'm currently totally focused to googling about everything for dedicated server systems. If you know any information with a guide / documentation / tutorial will be perfect for me. I already read all of documentation which can be found on google easily, compendium/ youtube / plugins documentations etc.

twin juniper Jan 1, 2021, 3:52 PM

#

rich ridge From server you can't destroy an actor only for one client. If you destroy actor...

That's exactly what I want, but on clients the actor won't destroy, it gets destroyed only on server, and the actor is set to replicated...

rich ridge Jan 1, 2021, 3:53 PM

#

@dry zodiac http://cedric-neukirchen.net/Downloads/Compendium/UE4_Network_Compendium_by_Cedric_eXi_Neukirchen_BW.pdf

dry zodiac Jan 1, 2021, 3:53 PM

#

rich ridge <@358122038663184384> http://cedric-neukirchen.net/Downloads/Compendium/UE4_Netw...

Already read all of pages. @thin stratus Thank you for this btw! 🙂

#

But there are not much information about dedicated servers on this documentation. 😦

silent valley Jan 1, 2021, 3:54 PM

#

@dry zodiac there's not much special about Dedicated server in Unreal, write some simple multiplayer games in UE4 and I guarantee along the way you will learn what you need for dedicated server 🙂

rich ridge Jan 1, 2021, 3:54 PM

#

twin juniper That's exactly what I want, but on clients the actor won't destroy, it gets dest...

If the actor is spawned by server, it is spawned for all. If server destroys that same actor it will be destroyed for all.

If your actor is not destroyed on client then something is wrong

rich ridge Jan 1, 2021, 3:55 PM

#

dry zodiac But there are not much information about dedicated servers on this documentation...

All the communication from client to server is handled by RPCs

dry zodiac Jan 1, 2021, 3:57 PM

#

silent valley <@!358122038663184384> there's not much special about Dedicated server in Unreal...

Actually I already created a multiplayer system with steam servers (listen server for now). And I'm pretty familiar about replication actors etc. But I'm stuck with post and get data to dedicated server. I would like to develop a game which can be play with more than 20+ players at the same time at worldwide.
To sum up, I need matchmaking and server protection. That's why I'm focusing to dedicated servers.
@rich ridge
As I said, I actually I know about replication but I don't how how can I handle with dedicated.

silent valley Jan 1, 2021, 3:58 PM

#

dry zodiac Actually I already created a multiplayer system with steam servers (listen serve...

Ok, well at this point you move beyond the capabilities of Unreal - you need to decide how you want these bits to work.

twin juniper Jan 1, 2021, 3:58 PM

#

rich ridge If the actor is spawned by server, it is spawned for all. If server destroys tha...

The server rpc practically is:
SpawnActor_Implementation(actor_class)
{
if(owned_actor not null)
{
owned_actor-> Destroy()
}
Owned_actor = spawnactorfromclass(actorclass)
}

And this doesn't work, I'm getting very confused, in blueprints this logic is working very well

silent valley Jan 1, 2021, 3:59 PM

#

For example in my game I use AWS to host my dedicated servers, and the AWS instance uses S3 SDK directly to read/write savedata. The savedata uses the built in Unreal savegame system, but AWS S3 stores the data in a persistent manner.

rich ridge Jan 1, 2021, 4:00 PM

#

@dry zodiac you don't need to write special code for dedicated server

#

@twin juniper put logs and check server logs.. where is the gap

#

@dry zodiac do you know how to build dedicated server?

dry zodiac Jan 1, 2021, 4:03 PM

#

silent valley Ok, well at this point you move beyond the capabilities of Unreal - you need to ...

Actually that's the problem. I am confused because I am moving outside of Unreal Engine as you said. I research some server providers like GCP, AWS, Photon and Playfab. And I decided to go GCP or / and Playfab. But the problem is I have no idea how to communicate with server. Which way should I use to the communicate?
@rich ridge sorry for tagging you btw 😦

dry zodiac Jan 1, 2021, 4:03 PM

#

rich ridge <@358122038663184384> do you know how to build dedicated server?

I watched few tutorials about it and I can test it locally without a problem. And after that, I lost 😄

rich ridge Jan 1, 2021, 4:03 PM

#

Ohhh I see now

#

What you want is OSS.

silent valley Jan 1, 2021, 4:04 PM

#

dry zodiac Actually that's the problem. I am confused because I am moving outside of Unreal...

Yes it's not easy - this part took me weeks of research and trial and error. But I would take it one step at a time.

Package the server using Linux (for example) and deploy to a GCP instance.
Once this is working and you can connect via IP address, then you could look at OSS for matchmaking/server discovery.

#

Where OSS is Steam or Epic Online Services, or equivalent

#

Design your infrastructure - how will you deploy/create/destroy your servers (I started with Terraform but now I ended up writing it all in Python directly)

#

Think about persistence - how will the player and world data persist. Using Unreal savegame or different system (database, etc)

#

You have many weeks of work to finish steps 1-4 🙂

rich ridge Jan 1, 2021, 4:09 PM

#

Dedicated servers are almost similar to listen server..

The dedicated server doesn't have UI(RHI THREAD) and when you run dedicated server it will MS-DOS like console...

Dedicated servers is your admin player who will only act as manager

dry zodiac Jan 1, 2021, 4:09 PM

#

silent valley Yes it's not easy - this part took me weeks of research and trial and error. But...

OSS mean online subsystem isnt it? So should I implement to dedicated server ip to Steam or Epic? As I said I already created create/invite/join session architecture. But will session works on dedicated servers?
If I need OSS as you said, GCP or AWS is just server provider for me isnt it?
Oh man my head will explode!
@rich ridge

silent valley Jan 1, 2021, 4:10 PM

#

You don't need OSS/Sessions - but you need some way of users enumerating all the available servers.

#

OSS/Sessions has some other useful stuff in though - like Users/Authentication/etc

#

Sessions work just fine on Dedicated - I use Steam and my dedicated server sessions appear in the server browser for my clients via the Steam OSS

#

although getting Steam to work on dedicated/Linux is a little tricky - feel free to DM me when you reach that point

dry zodiac Jan 1, 2021, 4:13 PM

#

silent valley You don't _need_ OSS/Sessions - but you need some way of users enumerating all t...

So do I need OSS for recieving player data according to platform? BTW I would like to create cross-play servers. But I guess this is not possible with Steam OSS isnt it?

rich ridge Jan 1, 2021, 4:14 PM

#

Let me give you simple explanation

Your server creates a session with sessionID - 1234, and you have N servers so N sessions. (OSS will store these N sessions in backend)
Now you player will want to join any one server from N servers, so player will do session search (using OSS backend), backend will pick any appropriate available server based on matchmaking rule. Player receives an available server's sessionID (1234).

Now player joins that server using sessionID, in that session ID object usually we have IP and Port, so get IP and port from sessionID object and join session.

#

does it simplify ?

#

the role of OSS here is to persist session related data and serve client's request

#

think it like a tinder, where OSS is doing match

dry zodiac Jan 1, 2021, 4:19 PM

#

Yeah it is pretty clear for now. This is like listen server as you said before. So only thing that I need, create sessions on server isnt it?

rich ridge Jan 1, 2021, 4:19 PM

#

yes server should create session.

#

ideally I do in GameMode's BeginPlay()

dry zodiac Jan 1, 2021, 4:20 PM

#

Hmm. Okay but how can I detect sessions count? If sessions are limited, I need to send a request to create a sessions, or like that I think.

#

How can I do that?

rich ridge Jan 1, 2021, 4:21 PM

#

you can't detect

#

fortnite have N servers, and each N servers create session ..... as a player playing fortnite does it matter to me how many servers are there

#

each player wants his reservation on any one server from among N servers.

rich ridge Jan 1, 2021, 4:25 PM

#

dry zodiac Hmm. Okay but how can I detect sessions count? If sessions are limited, I need t...

you can do this....
when your server creates session, it the operation is successful, and do rest API call to your backend (/start/serverId) (not OSS, as OSS doesn't support this) and increment active server count.
and when match gets over and just before server destroys itself agin hit your backend sever (/shutdown/serverId) and decrement active server count

dry zodiac Jan 1, 2021, 4:26 PM

#

Yeah it's right. But I stuck with this;
for example, I have one server on Berlin via GCP. So can I create only one session on this? I guess it will be very wrong and probably I got something wrong too 😦

rich ridge Jan 1, 2021, 4:27 PM

#

actually on one AWS or GCP instance you can run multiple dedicated servers of UE4.

#

for example your AWS instance is c5.9x -> with 18 cores and 24 GB RAM (approx) you can run 16 dedicated servers (16 sessions) of your UE4 game.

dry zodiac Jan 1, 2021, 4:29 PM

#

Hmm so I can create more than one session on one VM if requirements are okay?

rich ridge Jan 1, 2021, 4:29 PM

#

yes you can.

#

so what will happen is

on one VM if you run multiple dedicated severs. all dedicated servers will have same IP(same as that of VM) but different port

dry zodiac Jan 1, 2021, 4:32 PM

#

so basicly a server / session is a working exe of my ue4 project build. and I need to start that exe (which creating session on beginplay()) for every session. Isnt it?

rich ridge Jan 1, 2021, 4:32 PM

#

yes

#

to build a dedicated server you need source version of engine

dry zodiac Jan 1, 2021, 4:33 PM

#

hmm it is more clear for now. Appreciated! I'm very sorry for that but I have still one problem. How can I command to 'start one exe' on VM?

dry zodiac Jan 1, 2021, 4:34 PM

#

rich ridge to build a dedicated server you need source version of engine

Oh okay, I will get that on github I guess.

rich ridge Jan 1, 2021, 4:35 PM

#

ideally to automate things people make a startup script (which runs the dedicated server with if any command line parameters to pass).
and once this setup is perfect for them, they create the image of the VM and use the same image of VM to scale.

#

and whenver that VM starts, it executes the startup script and that startup script runs the dedicated server.

#

when you become very expert in this domain, have a look on this. https://agones.dev/site/

Agones

Agones is a library for hosting, running and scaling dedicated game servers on Kubernetes.

#

this tech was developed by PokemonGo and later made open

dry zodiac Jan 1, 2021, 4:41 PM

#

rich ridge and whenver that VM starts, it executes the startup script and that startup scri...

Hmm it looks okay but I guess it should be trigger from players according to search isnt it? I mean, for example, there are already 10 playing exe on VM and VM limit is 16. If any player is searching a game, or during searching a game idk, I guess we need to send a command that 'all sessions are full, and create another one on VM'. If it is correct logic, I guess players (clients) send that request to server, isnt it?

rich ridge Jan 1, 2021, 4:42 PM

#

you can do that but the problem is with the time time taken to bootup the VM, if your players can wait for 2 mins for your dedicated servers to become ready, then sure you can do that

shrewd tinsel Jan 1, 2021, 4:43 PM

#

hello, i have a question, if you call an event from client that is replicated to client , will it fire?

rich ridge Jan 1, 2021, 4:43 PM

#

ideally you should maintain pool of servers and based on the active server count you should scale up or scale down

#

@shrewd tinsel RPC is from client -> server, server -> one client, server -> all client.
client !-> client

kindred widget Jan 1, 2021, 5:12 PM

#

Question about FastArrays. Do you just need to mark the added item as dirty when you add it? Nothing else? I don't need to worry about doing extra if I remove an index, or worry about calling anything on the array itself?

silent valley Jan 1, 2021, 5:32 PM

#

dry zodiac Hmm it looks okay but I guess it should be trigger from players according to sea...

It is exactly this problem that PlayFab / Gamelift / etc are designed to solve. Load balancing and server pool management based on your configuration.

meager spade Jan 1, 2021, 6:07 PM

#

@kindred widget if you modify the array in anyway, you need to mark it dirty

kindred widget Jan 1, 2021, 6:08 PM

#

Yeah, finally got all of that sorted out. Now I just need to understand why HISM components seem to save rotations as -1 to 1.

#

When I get the world transform from an instance, I'd expect it to return a world rotator as well. But getting the Yaw out of an instance returns me a Rotator that has a yaw of -1 to 1. :/

pure finch Jan 1, 2021, 6:35 PM

#

do you guys generally do everything in single player to test everything and then do a replicatoin pass?

kindred widget Jan 1, 2021, 6:38 PM

#

That really depends on the system.

silent valley Jan 1, 2021, 6:40 PM

#

Generally not. Any system that needs to work online needs to be built with that in mind, but generally get it working with one player then expand it.
It comes from experience though, if it's easier for you to do it single player first then do that!

kindred widget Jan 1, 2021, 6:42 PM

#

I mean, animation is a great example. Animation is all client side. It should just work by default with no networking. You should be able to change client variables and see those changes update in the animation. But in networking, your server needs to have the ability to overwrite those variables on the client to make that client update it's animations on it's own. So.. technically I guess you started with a single player mindset. The same thing applies to user interface.

eternal canyon Jan 1, 2021, 7:34 PM

#

Does anyone else have the problem where if u edit a replicated array it will crash the game of the owning client?

kindred widget Jan 1, 2021, 7:48 PM

#

Not really? Sounds like a logic error. How are you editting the array?

peak sentinel Jan 1, 2021, 7:52 PM

#

Whats the crash log is about? @eternal canyon

eternal canyon Jan 1, 2021, 7:53 PM

#

I am Adding to it

#

with the add node

#

📎 message.txt

kindred widget Jan 1, 2021, 7:56 PM

#

@eternal canyon Are you altering the array in a loop?

eternal canyon Jan 1, 2021, 7:56 PM

#

yes

#

for each loop

kindred widget Jan 1, 2021, 7:57 PM

#

Don't ever do that. Always use a reverse loop when altering the array itself.

eternal canyon Jan 1, 2021, 7:57 PM

#

why?

#

oh wait

#

this is in a function

kindred widget Jan 1, 2021, 7:57 PM

#

Arrays auto resize. So if you loop over it and delete every single entry, you'll only actually delete every other entry.

eternal canyon Jan 1, 2021, 7:57 PM

#

I alter the array outside the function

#

does that still matte?

kindred widget Jan 1, 2021, 7:57 PM

#

It won't matter where you alter it.

eternal canyon Jan 1, 2021, 7:57 PM

#

matter?

kindred widget Jan 1, 2021, 7:58 PM

#

Think of it like this.

eternal canyon Jan 1, 2021, 7:59 PM

#

?

kindred widget Jan 1, 2021, 7:59 PM

#

You have an array of ten items, right? You For Loop over them and simply do

    for (int32 i = 0; i < MyArray.Num(); i++)
    {
        MyArray.RemoveAt(i);
    }```

eternal canyon Jan 1, 2021, 8:00 PM

#

📎 message.txt

#

still crashes the server

kindred widget Jan 1, 2021, 8:01 PM

#

This deletes the first one. Skips the second, Deletes the third, Skips the fourth, Deletes the fifth, Skips the sixth, Deletes the seventh, skips the eight, removes the 9th, skips the 10th. So despite trying to delet all entries, you've now deleted half.

#

What function is altering the array?

eternal canyon Jan 1, 2021, 8:01 PM

#

wdym?

#

the function I made?

#

or the function I am using such as Add?

kindred widget Jan 1, 2021, 8:02 PM

#

The one you made, that's altering the array.

eternal canyon Jan 1, 2021, 8:02 PM

#

get all steam ID

#

basically goes through each controller

#

and gets their steam id

#

and adds to to a local array

#

and on completed

#

returns and sets the replicated array

#

in a server rpc

kindred widget Jan 1, 2021, 8:04 PM

#

But you're not altering the array of controllers that you're iterating over though?

eternal canyon Jan 1, 2021, 8:04 PM

#

no

kindred widget Jan 1, 2021, 8:05 PM

#

Okay, that was what the for loop would have fixed.

eternal canyon Jan 1, 2021, 8:05 PM

#

is it a problem if its a function in the controller and its running on each controller?

#

like the controller calls the function

kindred widget Jan 1, 2021, 8:06 PM

#

I don't think that would matter.

#

I remember there being something about PlayerState that could get SteamIDs locally. I need to double check that.

native pagoda Jan 1, 2021, 8:10 PM

#

Ekhm, sorry for interupting, but im having problem with creating PIE sessions. Code that worked for 4.24 is not working on 4.26. Net mode is Standalone and other setting are default. Have you ever had similar problem ?

twin juniper Jan 1, 2021, 8:34 PM

#

What are some good ways to go around unit ownership in multiplayer? Pretty much the units are not always controlled by the player, they are mostly independent unless possessed (or told to attack a target when the player is close, but still mostly independent), but if player B gets near player A's units then player A's units' default response would be to attack. So far I just thought to store a 'owned by' variable inside each unit with type 'controller'

silent valley Jan 1, 2021, 9:25 PM

#

twin juniper What are some good ways to go around unit ownership in multiplayer? Pretty much ...

Even simpler would be an integer TeamID and assign a TeamID to each player used when spawning units.

meager spade Jan 1, 2021, 9:41 PM

#

def feels like you need a team setup

past tiger Jan 1, 2021, 9:49 PM

#

I'm getting some weird behaviour when sending a forward vector to the server - any values that are negative are instead subtracted from 360. anyone seen this before?
might be something dumb i'm doing but not sure what.
blue value is client info, red is what the server receives

📎 downtrace.png

kindred widget Jan 1, 2021, 9:58 PM

#

@past tiger How are you sending this?

past tiger Jan 1, 2021, 10:00 PM

#

i'm sending it as part of a struct in a parameter to an RPC

#

one sec, i'll try get a quick breakdown of it

kindred widget Jan 1, 2021, 10:03 PM

#

As an FVector UPROPERTY in the struct?

past tiger Jan 1, 2021, 10:03 PM

#

yes

kindred widget Jan 1, 2021, 10:06 PM

#

You're not doing any compression or anything, just printing it, RPCing, and printing it on the other side?

past tiger Jan 1, 2021, 10:06 PM

#

📎 qserver.png

#

📎 qstruct.png

#

📎 qclient.png

#

not that i can tell, here's the server code, struct and client code

#

debug message just before calling the RPC and just at the start of the server implementation

#

clientinfo is filled in inside the hitscan method

#

running on the server is fine (as expected) but sending from the client gives a lot of garbage info

📎 qserveroutput.png

kindred widget Jan 1, 2021, 10:10 PM

#

That's... Really odd. It's like it's compressing it as an FRotator. O.o

#

I would expect those numbers from a negative valued FRotator axis after compression and uncompression.

past tiger Jan 1, 2021, 10:11 PM

#

hmm, may have to split it into floats or just check for values greater than 1 when receiving

kindred widget Jan 1, 2021, 10:14 PM

#

Actually, you might also consider using an FRotator. They have an easy compression system to 1 or 2 bytes per axis. Same thing as a forward vector in the end.

past tiger Jan 1, 2021, 10:15 PM

#

oh ok, i'm fairly new to UE but my initial thought was to send the position and rotation to the server. i just couldn't figure out how to convert those to a forward vector

#

either that or to set up a trace with position and rotation

kindred widget Jan 1, 2021, 10:18 PM

#

It's definitely odd behavior. I've never seen an FVector behave that way.

past tiger Jan 1, 2021, 10:20 PM

#

If I normalize the FRotator is that the same as a forward vector? Might solve my problem

#

ah nvm, i've just found FRotator::Vector. thanks for your help!

clever plinth Jan 1, 2021, 10:37 PM

#

Is there a way to replicate a TSharedPtr, or any smart ptr type?

#

Or is there a way to get a raw ptr to a struct?

shut gyro Jan 1, 2021, 10:43 PM

#

@clever plinth No for your first question through regular Server/Client methods. For the second question, you can get the address of the struct with &

#

How would I set the timeout of the game net driver? I think it is 45 seconds by default, but where is that set and how can I modify it?

chrome bay Jan 1, 2021, 10:49 PM

#

UNetDriver::ConnectionTimeout

#

The properties are usually set in the DefaultEngine.ini

jolly siren Jan 1, 2021, 10:50 PM

#

InitialConnectTimeout as well

#

[/Script/OnlineSubsystemUtils.IpNetDriver]
MaxInternetClientRate=15000
MaxClientRate=20000
NetServerMaxTickRate=60
ConnectionTimeout=20
InitialConnectTimeout=60

clever plinth Jan 1, 2021, 10:54 PM

#

@shut gyro After doing that, I am getting this synax error

Cannot convert rvalue of type 'FTeam const*' to return type 'FTeam*'

#

Is there a way to get the memory of an object using something other than &?

hollow eagle Jan 1, 2021, 10:57 PM

#

Read the error... you're trying to return a const pointer (err, pointer to a const value) when the return type is non-const

clever plinth Jan 1, 2021, 10:58 PM

#

I got that, I'm just confused as how to get a non const reference

#

Oh wait, I'm stupid 🤦‍♂️

peak star Jan 2, 2021, 1:22 AM

#

When gamestate beginplay, I run through an array of player states and set a repnotify variable on each one. However, it omly seems to ever run the repnotify function on the playerstates that are on the server

fossil spoke Jan 2, 2021, 1:30 AM

#

Most likely because the PlayerStates on the Clients havent been spawned yet? Try delaying your change a bit and seeing if that helps, its not a solution, but just identifying that its a race condition issue.

peak star Jan 2, 2021, 1:39 AM

#

@fossil spoke yeah I suspect a race condition. But repnotify is supposed to fire even if someone enters the server after the change to the variable occurs, isnt it?

peak star Jan 2, 2021, 2:22 AM

#

I guess if this is an exception to that then i could have each playerstate on clients notify the server when they are spawned and THEN do the repnotify on the server.

peak sentinel Jan 2, 2021, 2:54 AM

#

Whats race condition?

clever plinth Jan 2, 2021, 3:19 AM

#

@peak sentinel When a variable hasn't caught up on Clients

#

More of a "delay" issue

peak sentinel Jan 2, 2021, 3:20 AM

#

I see, thanks for informing

sharp quarry Jan 2, 2021, 5:27 AM

#

argh bargh. trying out the advanced sessions plugin. set up a find session and create session main menu with the third person template. the join game button works in editor, but then doesn't work when i package it. it specifically fails on the Join Session node. Does anyone have any ideas?

umbral trellis Jan 2, 2021, 5:37 AM

#

is there any way to ensure a physics object is 100% in sync across clients?

daring portal Jan 2, 2021, 5:57 AM

#

i use the shooter game sample as my quick reference for setting up multiplayer and replication. is there a better reference? there's nothing wrong with the shooter game, i just thought it wouldn't hurt to check 🙂

sharp quarry Jan 2, 2021, 5:59 AM

#

@rich ridge I've done the ini edits to use Steam and the overlay part of steam works and when I open it up it tells everyone I'm playing spacewar so I know it's working somewhat

rich ridge Jan 2, 2021, 5:59 AM

#

@daring portal ActionRPG

daring portal Jan 2, 2021, 6:00 AM

#

sounds good, will give it a look!

rich ridge Jan 2, 2021, 6:01 AM

#

i got zero experience with steam, so can't help more @sharp quarry

sharp quarry Jan 2, 2021, 6:01 AM

#

Hopefully I'll go to sleep and it'll be magically fixed in the morning

steel fox Jan 2, 2021, 12:22 PM

#

I'm getting very confused, apart of ue4 compiling "old code" or visual studio not compiling due to intellisense not working well, today I've tryed to modify player "MaxWalkSpeed", in blueprint sending an rpc to server to change this value works very well, both on server and client, but in cpp server rpc won't change owned player speed(even after setting Movement component to replicated), so I tryed using a NetMulticast instead and it works fine, am I missing something?

thin stratus Jan 2, 2021, 12:45 PM

#

MaxWalkSpeed is not replicated

#

Whatever you are doing in Blueprints, idk why it works

#

You need to change MaxWalkSpeed with an OnRep variable, in the Character or similar.

unkempt tiger Jan 2, 2021, 12:59 PM

#

When trying to serialize an actor pointer from the client to the server, should I be doing anything special to take care of the case where the actor on the server was destroyed by the time the packet arrives?

#

I am pretty certain that line 34 just doesn't work at all and is a good case of misuse of bOutSuccess :V

📎 unknown.png

#

The actor in question being WeaponWantedToBeEquipped

vapid magnet Jan 2, 2021, 1:29 PM

#

So, after reading through pins, is it correct that there is zero guarantee that PlayerState will replicate in any timely matter, and the only way to check for it is a crutch timer loop?

#

During tests on local machine it takes ~22 ticks to replicate.

meager spade Jan 2, 2021, 1:37 PM

#

OnRep PlayerState if your using C++

#

blueprint, your out of luck

#

might be pretty instant on local machine, over the internet could take anywhere upto half a second

#

maybe more depending on net connection

vapid magnet Jan 2, 2021, 1:40 PM

#

thats a given, Im just very surprised that controller can even tick without a state like its nothing

#

anyway, thank you, I guess I have more delegates to make...

floral crow Jan 2, 2021, 1:51 PM

#

@vapid magnet use OnRep_PlayerState as UKaosSpectrum suggests and trigger the functionality you want from there (like enabling the tick on player controller if that's what you need)

#

I assume you are using C++ if doing a multiplayer game

vapid magnet Jan 2, 2021, 1:52 PM

#

im trying to set up an widget with local player's name

#

and yes, I try to avoid blueprints as much as possible

floral crow Jan 2, 2021, 1:53 PM

#

Wrap up the widget creation in a method and call it from the OnRep

vapid magnet Jan 2, 2021, 1:53 PM

#

thats the plan now

floral crow Jan 2, 2021, 1:53 PM

#

Though I'd probably use blueprints to create the widget

#

That's a great usecase for them, it is way simpler and you are not gonna improve performance noticeably unless the widget does crazy stuff

vapid magnet Jan 2, 2021, 1:54 PM

#

I am overall disappointed with the blueprint->C++ interaction, because there is seemingly no neat way to instantiate a blueprint widget from C++

#

at least while following UE style guidelines

floral crow Jan 2, 2021, 1:55 PM

#

I'm not surprised, as you should truly be creating them on BP

bitter oriole Jan 2, 2021, 1:55 PM

#

@vapid magnet That's very easy to do

#

Create an UPROPERTY() TSubclassOf<AActor> on the C++ actor to expose a property for the class to spawn

#

In the Blueprint class for that actor, set the field (to the Blueprint to spawn)

floral crow Jan 2, 2021, 1:56 PM

#

When I said wrap up, I meant declare a BlueprintImplementable event on your PlayerController that creates the widget, and call it from the OnRep_PlayerState in C++

bitter oriole Jan 2, 2021, 1:56 PM

#

And you're done, it's that easy

vapid magnet Jan 2, 2021, 1:57 PM

#

@bitter oriole that still requires a blueprint class based on the c++ one, which still feels very crutch to me
but I've accepted that its how things are done in UE

bitter oriole Jan 2, 2021, 1:58 PM

#

Blueprint is how you handle content

#

Doing it this way is quite powerful, you can use a TSoftObjectPtr to load the asset in memory when needed, etc

#

Though you can also hardcode the asset path in C++ in constructor, if you hate Blueprint

vapid magnet Jan 2, 2021, 1:59 PM

#

it makes sense in its own way, it just differs so much from what im used to

#

and yeah, no more hardcoding paths for me

bitter oriole Jan 2, 2021, 2:00 PM

#

Yeah I definitely recommend the Blueprint approach

steel fox Jan 2, 2021, 2:36 PM

#

Why is begin play not setting my values correctly in c++? Is there a method that is like begin play but it surely sets variables correctly? After setting some variable in begin play I noticed that sometimes it's like if they were never setted

bitter oriole Jan 2, 2021, 2:38 PM

#

Show the code

#

Explain what you want to happen

#

Explain what does happen

steel fox Jan 2, 2021, 2:43 PM

#

That's the code, I noticed that FireTimeGap is 0 after printing it on screen and trying to set some Timers and seeing them not working, FireRate is not 0, it's not the issue

📎 unknown.png

#

If I set FireTimeGap with the same formula in another function the value is correct

floral crow Jan 2, 2021, 2:44 PM

#

Where did you set FireRate?

steel fox Jan 2, 2021, 2:44 PM

#

In the constructor I set a minimum value, but I also set it to be BlueprintReadWrite and EditAnywhere

vapid magnet Jan 2, 2021, 2:45 PM

#

you tried logging the values in beginplay?

steel fox Jan 2, 2021, 2:45 PM

#

logging?

vapid magnet Jan 2, 2021, 2:45 PM

#

print to log

#

using UE_LOG(...)

bitter oriole Jan 2, 2021, 2:46 PM

#

When exactly are you checking the value ?

floral crow Jan 2, 2021, 2:46 PM

#

steel fox That's the code, I noticed that FireTimeGap is 0 after printing it on screen and...

Is this the class you are instantiating from? Or are you inheriting from it on another class and that's where you are printing the values? Could you have forgotten to call Super::BeginPlay on child class?

steel fox Jan 2, 2021, 2:47 PM

#

I don't have a begin play in parent class

steel fox Jan 2, 2021, 2:47 PM

#

bitter oriole When exactly are you checking the value ?

Before setting a timer

vapid magnet Jan 2, 2021, 2:47 PM

#

or maybe its not set as the class of choice in gamemode

#

did that myself couple of times

steel fox Jan 2, 2021, 2:48 PM

#

That code is inside an actor that I attach to the player character when requested to

vapid magnet Jan 2, 2021, 2:48 PM

#

yeah, anyway, if you inherit stuff, I recommend checking the classes again

#

that was my personal bane for a bit

bitter oriole Jan 2, 2021, 2:49 PM

#

@steel fox I mean, basically, it sounds like you are using the value before BeginPlay.

floral crow Jan 2, 2021, 2:49 PM

#

steel fox Before setting a timer

When in the actor's lifecycle do you set the timer?

#

Either that, or begin play is not getting called at all (possible if you forgot to call Super::BeginPlay on child class)

steel fox Jan 2, 2021, 2:50 PM

#

I've binded a key in my character that calls a function inside that attached actor and starts a timer

steel fox Jan 2, 2021, 2:50 PM

#

floral crow Either that, or begin play is not getting called at all (possible if you forgot ...

I'm sure it gets called because the widget appears correctly on player screen

floral crow Jan 2, 2021, 2:52 PM

#

Hmm, btw why do you set the default FireRate in the constructor? Why not declare it on the .h file?

#

Constructor shenanigans in unreal could be messing you up

steel fox Jan 2, 2021, 2:53 PM

#

I set it inside the constructor just to be sure is not 0

#

📎 unknown.png

#

📎 unknown.png

#

StartFiring is called inside a Server RPC

floral crow Jan 2, 2021, 2:55 PM

#

Can you print FireRate as well?

steel fox Jan 2, 2021, 2:55 PM

#

Ok

floral crow Jan 2, 2021, 2:57 PM

#

Is there any other place where you could be setting FireTimeGap?

steel fox Jan 2, 2021, 2:57 PM

#

📎 unknown.png

#

No, begin play is the only place

floral crow Jan 2, 2021, 3:00 PM

#

How do you declare FireTimeGap?

steel fox Jan 2, 2021, 3:02 PM

#

UPROPERTY(VisibleAnywhere, BlueprintReadWrite)
float FireTimeGap;

floral crow Jan 2, 2021, 3:06 PM

#

I'm sorry dude, not sure where to go from here... What you are doing should work based on what I'm seeing. That means the problem is somewhere else

#

As a longshot I'd change setting the value in the constructor of FireRate and FireTimeGap to set default values in the .h file

#

To be extra safe the constructor is not messing things up

steel fox Jan 2, 2021, 3:10 PM

#

Thx anyway, I'm very confused but fortunately I've already discovered how to get around that, I'll try setting default values inside .h as you said

floral crow Jan 2, 2021, 3:10 PM

#

And double check FireTimeGap is not accidentally being set to Zero somewhere else (think if FireTimeGap = 0 instead of == 0)

steel fox Jan 2, 2021, 3:11 PM

#

floral crow And double check FireTimeGap is not accidentally being set to Zero somewhere els...

Yeah that error😆 , I'll check that too

meager spade Jan 2, 2021, 3:14 PM

#

@steel fox i assume this is for automatic weapons

#

FireTimeGap seems like a really bad name btw

#

normally you have a RateOfFire variable

#

oh i see, TimeBetweenShots is what i call it

steel fox Jan 2, 2021, 3:15 PM

#

meager spade FireTimeGap seems like a really bad name btw

I'm not a native english speaker so I don't have better ideas😅

steel fox Jan 2, 2021, 3:15 PM

#

meager spade <@673937209371525120> i assume this is for automatic weapons

Exactly for that

meager spade Jan 2, 2021, 3:16 PM

#

also be wary with using timers, one of the issues is its frame rate dependant, if frames speed up/down so will the rate of fire 😄

steel fox Jan 2, 2021, 3:17 PM

#

meager spade also be wary with using timers, one of the issues is its frame rate dependant, i...

Perfect, the game will be more realistic with varying fire rate😂

meager spade Jan 2, 2021, 3:18 PM

#

another thing is not adjusting for people spamming the trigger, seen many games where spamming the trigger will fire faster than the ROF 😄

steel fox Jan 2, 2021, 3:19 PM

#

😂yeah that's an issue

meager spade Jan 2, 2021, 3:19 PM

#

    const float LastShotFireTime = GetLastShotFireTime();
    const float WeaponROF = GetWeaponROF();
    const float RefireTime = (LastShotFireTime + WeaponROF);

    if (GameTime < RefireTime)
    {
        if (!FMath::IsNearlyEqual(GameTime, RefireTime, .001f))
        {
            GetWorld()->GetTimerManager().SetTimer(DelayFirstFireHandle, this, &UKaosFireMode_Automatic::StartFire, FMath::Max(.001f,RefireTime  - GameTime), false);
            UE_LOG(LogTemp, Warning, TEXT("UKaosFireMode_Automatic: StartFire failed, retrying.. %f, %f"), GameTime, RefireTime);
            return;
        }
    }

  FireShot();```

#

i handle that like this, this is my StartFire function

steel fox Jan 2, 2021, 3:20 PM

#

Thx

meager spade Jan 2, 2021, 3:20 PM

#

you also need to adjust the timer

#

    bRefiring = (GetWeaponFiring() && GetWeaponROF() > 0.0f) && bFired;

    if (bRefiring)
    {
        GetWorld()->GetTimerManager().SetTimer(ShotFireHandle, this, &UKaosFireMode_Auto::RefireWeapon, FMath::Max<float>(NextShotTime + GetTimerIntervalAdjustment(),SMALL_NUMBER), false);
        SetTimerIntervalAdjustment(0.f);
    }```

#

after each shot

#

then refire weapon does ```void UKaosFireMode_Auto::RefireWeapon()
{
const float SlackTimeThisFrame = FMath::Max(0.0f, (GetWorld()->GetTimeSeconds() - GetLastShotFireTime()) - GetWeaponROF());
SetTimerIntervalAdjustment(GetTimerIntervalAdjustment() - SlackTimeThisFrame);

    FireShot();

}```

peak sentinel Jan 2, 2021, 4:57 PM

#

When to use FVector_NetQuantize instead of normal FVector?

#

And is there any significant affects to CPU when we use it?

jolly siren Jan 2, 2021, 5:08 PM

#

NetQuantize is to reduce network bandwidth. They are smaller and less precise than their normal data type counterparts.

random verge Jan 2, 2021, 5:12 PM

#

Happy New Year all 🙂

#

Anyone happen to have some good resources on the Network Prediction plugin?

#

I can't seem to find anything other than the UE4 API docs

rich ridge Jan 2, 2021, 5:35 PM

#

@random verge it's not documented at all.. your only option is to go through source and understand .

eternal canyon Jan 2, 2021, 9:40 PM

#

Are there certain values u can adjust to have less rubberbanding in custom movement as I have looked at Blindopoly Reid's Custom Movement Example Project like 5 times and I dont see a difference
as once u play on like 80 ping and above u get really bad rubberbanding for me
?
likfe for sprinting^^

meager spade Jan 2, 2021, 9:41 PM

#

i don't get rubber banding when sprinting

timid moss Jan 2, 2021, 10:17 PM

#

Does anyone know if the network prediction plugin will replace the CMC?

eternal canyon Jan 2, 2021, 10:47 PM

#

prob not but who knows

quasi parrot Jan 2, 2021, 11:19 PM

#

Hey, quick question. Can we force to join a default map after a join session, or it will always be the server map ?

kindred widget Jan 2, 2021, 11:20 PM

#

As far as I know, clients need to be on the same map as the server.

quasi parrot Jan 2, 2021, 11:21 PM

#

yep, i was actually thinking of a client travel use. You join a empty map, and use the travel system to obtains a good loading screen

#

Right now i'm using a load streamLevel with multile level to stimulate a sort of loading screen.

quasi parrot Jan 2, 2021, 11:39 PM

#

https://dawnarc.com/2019/07/ue4networking-in-baisc-sessions/
That pretty much the only base i can work with

玄冬Wong

[UE4]Networking in Baisc - Sessions

Keywords: UE4, Networking

twin juniper Jan 2, 2021, 11:52 PM

#

hey guys where would be the best place to store a score? trying to create something similar to lets say football or basketball where there is a actor that is displaying the score, trying to find something that will show up for the client

kindred widget Jan 2, 2021, 11:54 PM

#

If it's akin to team scores, GameState. If you want individual player stats or scores, PlayerState.

twin juniper Jan 2, 2021, 11:54 PM

#

thanks so much the gamestate should be what i was looking for, for some reason i thought it was the game instance

#

let me try that real quick and see if it works. Thanks 🙂

kindred widget Jan 2, 2021, 11:56 PM

#

GameState is available for all clients, and also very easy to get a reference to for UI uses, so it's a great place to keep game wide information that all clients need to see.

sharp plover Jan 3, 2021, 12:01 AM

#

How expensive is it in terms of performance to replicate foliage actors? Looking at around 10 000 trees or more needed to get serialized only once with start location. Wondering if I should just use a bitpacker to serialize it myself and send over that blob and deserialize on each client or let unreal handle it

#

and by replicate, only position and rotation needs to be replicated, nothing else

meager spade Jan 3, 2021, 12:04 AM

#

fortnite replicates 50K actors

#

if they are placed in the level

#

set them to initially dormant

#

and voila, no cost

sharp plover Jan 3, 2021, 12:05 AM

#

Oh lovely, thank you

kindred widget Jan 3, 2021, 12:29 AM

#

@sharp plover I did mine via a manager class and using inherited versions of the FoliageHISM components. Keeps the foliage cheap on draw calls, allows you to remove instances with very little networking, and the designer to still pain foliage via the foliage painter.

sharp plover Jan 3, 2021, 12:32 AM

#

Oh so you managed to do so with the base static foliage component?

#

had a hard time tracking each instance of the trees in that regard

kindred widget Jan 3, 2021, 12:33 AM

#

📎 unknown.png

#

Basically, anything that inherits from that CInteractableFoliageComponent that gets used to pain foliage, can be used to "pick up" the foliage. I still have some work to do on animating the instances and whatnot in different ways, but you use that component to paint the foliage with painter, this allows easy level design.

#

Then I have a second class that is spawned from GameState's Server side as a replicated actor that is a simple manager. This runs a function that gets all local client's CInteractableFoliageComponents on the map to cache them for easy use.

#

The player can then trace on their client, and runs an RPC through the controller class to call a function on the manager. This function passes along the mesh pointer, and a location vector. The server version of the manager just adds this to a fast array.

#

Then the client version of the manager uses the replicated value to remove that instance at that location. After a while or whenever desired, you can remove instances from that array, which respawns them on all clients, etc.

sharp plover Jan 3, 2021, 12:38 AM

#

is it not possible to have it as a actor foliage and remain using the instancestaticmesh component with the same performance? Or is unreal super unhappy about that many foliage actors

kindred widget Jan 3, 2021, 12:39 AM

#

Not as far as I was aware. Even with the painter, I assumed that foliage actors were individual actors, and would not benefit from the HISM draw call reduction.

sharp plover Jan 3, 2021, 12:40 AM

#

Ah I see. I'll try to experiment a little regarding that. Thank you so much authaer, very detailed response 🙂

#

Static Meshes placed with Foliage Edit Mode are automatically grouped together into batches that are rendered using hardware instancing where many instances can be rendered with only a single draw call, while Actor Foliage comes at the same rendering cost as placing normal Actors into a scene.

No need to experiment, you are absolutely right

kindred widget Jan 3, 2021, 12:44 AM

#

You can test it out yourself with simple arrays at first and some functions to add/remove foliage on the clients. I did it with fast arrays to fully optimize it for future use. But all the array needs to be, or at least how I did it, was just a UStaticMesh*, FVector and a uin16 that was actually the Yaw of the Rotator ran through FRotator's CompressToShort.

sharp plover Jan 3, 2021, 12:48 AM

#

That's perfect 😄 Will play around the the component style approach instead. Thank you once more

green moat Jan 3, 2021, 1:34 AM

#

I have a server function that sets a replicated variable but when I try to access it from the client it doesn't exist. Isn't that the definition of setting a variable to replicated that it gets sent to clients when it's changed?

devout vine Jan 3, 2021, 2:08 AM

#

How client trigger new session(UE4 server instance) on dedicated server? ex: client want to create new room/lobby 🙏

#

any tutorial or plugin or something to implement that?

devout vine Jan 3, 2021, 2:45 AM

#

@green moat I believe UE just replicated variable on gamestate. playerstate, playercharacter,... by default

rapid bronze Jan 3, 2021, 2:51 AM

#

green moat I have a server function that sets a replicated variable but when I try to acces...

You need to RPC it most likely, best way is to show the code cause it's very generic said like that

green moat Jan 3, 2021, 2:53 AM

#

rapid bronze You need to RPC it most likely, best way is to show the code cause it's very gen...

I figured out I was trying to set a player controller that wouldn't exist on another client

rapid bronze Jan 3, 2021, 2:54 AM

#

Yeah, PlayerController is unique to you

#

Other clients can't access yours

green moat Jan 3, 2021, 2:55 AM

#

Yeah I wasn't aware of that

rapid bronze Jan 3, 2021, 2:55 AM

#

📎 unknown.png

green moat Jan 3, 2021, 2:55 AM

#

is it the same for player state?

rapid bronze Jan 3, 2021, 2:55 AM

#

http://cedric-neukirchen.net/Downloads/Compendium/UE4_Network_Compendium_by_Cedric_eXi_Neukirchen.pdf

#

PlayerState and GameState you can access

#

That graph explains it well

green moat Jan 3, 2021, 2:56 AM

#

yeah thats a nice visual thank you

#

I've stumbled upon that compendium a few times I really need to go through it.

rapid bronze Jan 3, 2021, 2:56 AM

#

Not very long of a read but useful to comprehend it all better

green moat Jan 3, 2021, 3:02 AM

#

I've set the "Killer" variable on my character to an actor, cast it to the character bp and I'm trying to access the player state but it's none

kindred widget Jan 3, 2021, 3:04 AM

#

Is the character pointer that's being replicated valid and accurate? If so, how are you trying to access the playerstate through it?

green moat Jan 3, 2021, 3:04 AM

#

This is in a widget

📎 unknown.png

kindred widget Jan 3, 2021, 3:05 AM

#

And the cast succeeds?

green moat Jan 3, 2021, 3:05 AM

#

yeah, it tells me it accessed none on player state

kindred widget Jan 3, 2021, 3:10 AM

#

Hmm. Odd. That should work. What if you check if the PlayerState is valid?

green moat Jan 3, 2021, 3:11 AM

#

says it's not valid

#

could be cause I'm using an aicontroller to posses the pawn for click to move navigation

kindred widget Jan 3, 2021, 3:12 AM

#

Ah, that would do it. AI don't get playerstates by default.

green moat Jan 3, 2021, 3:54 AM

#

@kindred widget can you change the default?

kindred widget Jan 3, 2021, 3:56 AM

#

If I recall, the AIController has a setting on it that is something like "Gets PlayerState" or something like that.

eternal canyon Jan 3, 2021, 4:50 AM

#

is there an equivalent to Launch Character in custom Movement component

#

for net prediction

rapid bronze Jan 3, 2021, 5:07 AM

#

Wait

#

I don't know if i'm totally thinking wrong now

#

But you're trying to get PlayerState in a Widget

#

Is that supposed to work or you gotta pass a PlayerState reference to the Widget from something that actually has access to it?

kindred widget Jan 3, 2021, 5:18 AM

#

@eternal canyon I believe that calling Launch Character on the server will work.

cursive rivet Jan 3, 2021, 6:46 AM

#

When i open up the exe that was made when packaging it does not load steam with it but if i go into my binaries folder and open up the exe there is does open steam with it. Not sure why my packaged exe will not load steam

#

Should i post this in the #packaging channel or here?

feral glacier Jan 3, 2021, 6:49 AM

#

So I'm working on a multiplayer lobby system. I had everything working but now for whatever reason the client joins the session but the lobby level never loads for the client. Anyone have any insight? Its been driving my crazy since the client seems to think everything works

#

📎 unknown.png

#

ok looks like the session joins but the connection times out

#

📎 unknown.png

#

works in editor just fine

sudden lagoon Jan 3, 2021, 7:07 AM

#

Hi guys , I'm new to this discord server . BTW do you know know how to make multiplayer using my own server without any services like EOS ,AWS etc . Also , do you ppl know how to code advanced matchmaking and anti - cheat in C++ unreal engine . If yes plz reply to this message .

rich ridge Jan 3, 2021, 7:46 AM

#

@sudden lagoon if you have your own server, means your IP is static. so tell you clients directly do open IP:7777

#

now you want to incorporate matchmaking into your own server, so you need to some matchmaking service .. so fork it and run it on one of your server https://open-match.dev/site/ powered by google

#

this framework do have well documented swagger docs.

#

so your forked version of matchmaking will return IPs from the list of your maintained in-house servers.

#

this is the abstract, you need to implement it

wise gazelle Jan 3, 2021, 8:57 AM

#

I am going to make multiplayer shooter game, not sure how many players the networking system can handle?

pallid mesa Jan 3, 2021, 8:58 AM

#

it depends on how hard you go on network optimisation

wise gazelle Jan 3, 2021, 9:02 AM

#

Okay, let's say I am going to make battle royale game, it will be client authoritative for character movement and shot position calculation. Inventory management, Gun purchasing, Grab guns from ground will do at server. I am going to use replication graph too.

pallid mesa Jan 3, 2021, 9:06 AM

#

if you understand how networking works and you do have the resources to hold a powerful dedicated server, you could look at fortnite as a milestone. Now, thats not very realistic for a one person game.

When I say understanding networking I really mean it:

roles
Rep graph
net culling
relevancy
dormancy

#

if you arent going to base your movement code on the cmc you might win a bit

#

there are other techniques like occluded networking based on pausing the net relevancy based on your frustrum view, that could help to alleviate your server... but again it all consists on an amalgam of contextual techniques... (ie: you wouldn't apply the same techniques in a open battlefield than in a corridor like BR)

steel fox Jan 3, 2021, 9:08 AM

#

How can I check IsLocallyControlled() on listen server? I always get false...

pallid mesa Jan 3, 2021, 9:08 AM

#

Uh?

#

That doesnt sound right

#

locality belongs to the owning client

#

so if you are not in the owning client it will return false

steel fox Jan 3, 2021, 9:12 AM

#

It the owning client is the listen server too IsLocallyControlled return false🤨, I tought that maybe there is something to check if a client is the listen server or something like this

pallid mesa Jan 3, 2021, 9:13 AM

#

IsServer() && HasAuthority()

#

😄

#

you can take a look at the implementation of the former

steel fox Jan 3, 2021, 9:14 AM

#

Mmm, yeah, I'll try this

#

It still doesn't work, plus now the code executes on all clients except on the one that's listen server

pallid mesa Jan 3, 2021, 9:19 AM

#

are you sure you are not reverting your logic somehow?

#

XD

#

that check will ensure that the code will execute in the authority role within your server instance

#

it means exclusivity for listen servers

steel fox Jan 3, 2021, 9:24 AM

#

Is GIsServer the same thing as using IsServer()?

pallid mesa Jan 3, 2021, 9:26 AM

#

I dont know right now, I dont have ue4 by hand to check out the code

#

but use GetWorld()->IsServer ()

steel fox Jan 3, 2021, 9:29 AM

#

Mmm no, it's not working, I'll generare c++ code from blueprint and check there, in bp it works...

sudden lagoon Jan 3, 2021, 11:17 AM

#

@rich ridge what about the code for advanced matchmaking and anti - cheat ?

sudden lagoon Jan 3, 2021, 11:18 AM

#

sudden lagoon <@!593363066276675584> what about the code for advanced matchmaking and anti - c...

I understood what you said about multiplayer with my servers

rich ridge Jan 3, 2021, 11:19 AM

#

open-match is your matchmaking system , so it should be advanced not client... client will only be requesting the match based on his region and level and skill. its your matchmaking backend system who should be advanced and smart not your game client

#

and about anti-cheat, you should design your code well and should expose only minimal stuff to client.

#

always have server authority, always commit critical game logic on server not on client.

sudden lagoon Jan 3, 2021, 11:26 AM

#

I need some sample code in C++ I have no idea about the code for advanced matchmaking and anti - cheat . I need code for help .

#

For Advanced Matchmaking and Anti - Cheat

rich ridge Jan 3, 2021, 11:26 AM

#

advanced matchmaking is your backend, so it will be either in Python, Java, Go,

#

matchmaking is not client side stuff

#

its backend stuff

#

https://open-match.dev/site/

Open Match

Open Match connects players from around the world.

sudden lagoon Jan 3, 2021, 11:27 AM

#

If you have a video on it plz put it a link to a reply to this message .

rich ridge Jan 3, 2021, 11:27 AM

#

so if you fork above , you will need to modify it as per your needs

rich ridge Jan 3, 2021, 11:28 AM

#

sudden lagoon If you have a video on it plz put it a link to a reply to this message .

no video i guess

sudden lagoon Jan 3, 2021, 11:28 AM

#

ok

rich ridge Jan 3, 2021, 11:28 AM

#

i just gave an example, you are free do to your own research and come to a conclusion

sudden lagoon Jan 3, 2021, 11:29 AM

#

wait open match is for unity

#

not unreal

rich ridge Jan 3, 2021, 11:29 AM

#

they say unity uses it..

#

unreal can use it too

#

i think you should try this https://heroiclabs.com/

#

this is a full package

#

it has unreal plugin

#

https://heroiclabs.com/docs/deployment-digital-ocean/

fringe sinew Jan 3, 2021, 2:22 PM

#

Did the method for connecting to SteamSubSystem change?

#

If I remember correctly,

+NetDriverDefinitions=(DefName="GameNetDriver",DriverClassName="OnlineSubsystemSteam.SteamNetDriver",DriverClassNameFallback="OnlineSubsystemUtils.IpNetDriver")

[OnlineSubsystem]
DefaultPlatformService=Steam

[OnlineSubsystemSteam]
bEnabled=true
SteamDevAppId=480
SteamAppId = 480

[/Script/OnlineSubsystemSteam.SteamNetDriver]
NetConnectionClassName="OnlineSubsystemSteam.SteamNetConnection"```

#

You paste this in the DefaultEngine.ini and enable the OnlineSubSystemSteam in the plugins and you would see the Steam Overlay when you try to PIE or Standalone.

#

I found threads that say, it's a bug in the Engine 4.25 is it still happening in 4.26?

#

For me it's just shutting down.

LogPluginManager: Mounting plugin SteamShared
LogPluginManager: Mounting plugin SteamVR
LogSteamShared: Display: Loading Steam SDK 1.47
LogSteamShared: Steam SDK Loaded!
LogOnline: OSS: Creating online subsystem instance for: Steam
LogOnline: Display: STEAM: OnlineSubsystemSteam::Shutdown()
LogOnline: OSS: Unable to create OnlineSubsystem module Steam
LogOnline: OSS: Creating online subsystem instance for: Steam
LogOnline: Display: STEAM: OnlineSubsystemSteam::Shutdown()```

silent valley Jan 3, 2021, 3:33 PM

#

Guys - I accidentally left my dedicated server running over Christmas - I think it's been up for about 2 weeks now.
I connected with my client and it's behaving a little odd - some actions are not working.
I am getting a lot of this spammed in the log - does anyone know what would cause this?
I tried reconnecting several times and it is still an issue.

LogNetPlayerMovement: Warning: ServerMove: TimeStamp expired: 0.423823, CurrentTimeStamp: 1.446915, Character: BP_TopDownCharacter_C_2147476751
LogNetPlayerMovement: Warning: ServerMove: TimeStamp expired: 0.423823, CurrentTimeStamp: 1.475317, Character: BP_TopDownCharacter_C_2147476751

#

FWIW I restarted the server and it is all working ok 😬
Guess I might need to regularly restart the server...

jolly siren Jan 3, 2021, 3:40 PM

#

Unreal dedicated servers are not meant to be long running

#

There will be issues such as clock drift

silent valley Jan 3, 2021, 3:41 PM

#

Clock drift?

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According to the log the timestamp is 969192 which equates to the length of time the server has been running. I'm a bit worried that the server cannot run for 11 days without exhibiting an engine problem.

jolly siren Jan 3, 2021, 3:48 PM

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Yes, precision errors add up the longer the server runs.

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Why do you need a server to run for 11 days?

silent valley Jan 3, 2021, 3:49 PM

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It's a persistent world game, similar to Rust.
I was hoping 30 days without a server reset...

unique wave Jan 3, 2021, 3:50 PM

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persistent world doesn't necessarily mean no restart.

silent valley Jan 3, 2021, 3:50 PM

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I know but I don't want to kick all the players every few days ideally.

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Maybe I could write something to auto rejoin if the server is rebooted... not ideal tho

unique wave Jan 3, 2021, 3:51 PM

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Even MMOs will generally have a restart once a week or so :p

silent valley Jan 3, 2021, 3:52 PM

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yeah fair enough! I can design around this for now.

jolly siren Jan 3, 2021, 4:01 PM

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The internal timer on the net driver is a 32 bit float that stores seconds. So if you have a long running server the time precision eventually breaks down. I would recommend changing this from a float to a long double to increase the amount of time until this issue comes up.

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If you are using a custom engine

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Actually looks like Epic already made this change in 4.25

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They made it a double

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/** Accumulated time for the net driver, updated by Tick */
    UE_DEPRECATED(4.25, "Time is being replaced with a double precision value, please use GetElapsedTime() instead.")
    UPROPERTY()
    float                        Time;

    double GetElapsedTime() const { return ElapsedTime; }
    void ResetElapsedTime() { ElapsedTime = 0.0; }

private:
    double                        ElapsedTime;

silent valley Jan 3, 2021, 4:03 PM

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I am using source but it's largely unmodified.
I don't know which bits were failing though - some parts of the game worked ok.
Character Movement Component definitely had some problems though.

jolly siren Jan 3, 2021, 4:04 PM

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CMC is heavily reliant on deltatime so that would make sense

edgy sedge Jan 3, 2021, 4:04 PM

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Anyone come across this error before....

Warning: STEAM: Failed to initialize game server with Steam!

silent valley Jan 3, 2021, 4:04 PM

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Timestamp in CMC is float not double

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although according to the source it gets reset periodically...

wind oasis Jan 3, 2021, 4:06 PM

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How can I use p2p without steam ?

unique wave Jan 3, 2021, 4:06 PM

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edgy sedge Anyone come across this error before.... > Warning: STEAM: Failed to initialize ...

If you are running server through steamCMD, maybe because you are also logged in on normal steam client at the same time on the same machine?

jolly siren Jan 3, 2021, 4:07 PM

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yes, it does get reset

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    /** Minimum time between client TimeStamp resets.
     !! This has to be large enough so that we don't confuse the server if the client can stall or timeout.
     We do this as we use floats for TimeStamps, and server derives DeltaTime from two TimeStamps. 
     As time goes on, accuracy decreases from those floating point numbers.
     So we trigger a TimeStamp reset at regular intervals to maintain a high level of accuracy. */
    UPROPERTY()
    float MinTimeBetweenTimeStampResets;

edgy sedge Jan 3, 2021, 4:07 PM

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@wind oasis You'll need to use an external matchmaking service e.g. EOS or GameLift FlexMatch or whatever it's called, there's quite a few options, use it to track who's currently hosting and then use the ol open [IP ADDRESS] console command

silent valley Jan 3, 2021, 4:08 PM

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anyway thanks @jolly siren - I'll try initializing Net timestamp to 1000000 instead of zero and see if the problem is repeatable.

edgy sedge Jan 3, 2021, 4:08 PM

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unique wave If you are running server through steamCMD, maybe because you are also logged in...

I'm trying to create a P2P session. I just can't even find that error in the github repo

unique wave Jan 3, 2021, 4:09 PM

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edgy sedge I'm trying to create a P2P session. I just can't even find that error in the git...

Then I'm afraid I don't have more experience with it that can be of assistance 🙂 sorry, good luck!

edgy sedge Jan 3, 2021, 4:09 PM

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Ok I have actually found it 😂 Github search is pretty bad sometimes

jolly siren Jan 3, 2021, 4:10 PM

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@silent valley No problem. Let me know if you figure it out so I can pass it along to other people trying to do long running servers.

wind oasis Jan 3, 2021, 4:13 PM

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edgy sedge <@!476401562194018304> You'll need to use an external matchmaking service e.g. E...

thanks

edgy sedge Jan 3, 2021, 4:13 PM

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Just putting this here for record incase anyone else tries to search it
Warning: STEAM: Failed to initialize game server with Steam! means you need to set bInitServerOnClient=true in Engine INI

wind oasis Jan 3, 2021, 4:14 PM

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I think I will stay with steam p2p

kindred widget Jan 3, 2021, 4:25 PM

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@jolly siren Can I ask where you found that time thing? I heard they were doing some time stuff and some precision work in 4.26, but the UWorld TimeSeconds is still a float.

jolly siren Jan 3, 2021, 4:26 PM

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I pasted the changes they made in 4.25 to the NetDriver time

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UWorld::TimeSeconds is still a float though

kindred widget Jan 3, 2021, 4:34 PM

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Yeah, no changes to that in 4.26. Had to go look. That does actually make me wonder. I know floats are heavily used in UE4 because it's traditionally a multiplayer engine for shooters, but in single player processing on one machine, are doubles that much heavier on the processing?

jolly siren Jan 3, 2021, 4:35 PM

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No, doubles are fine when used where needed

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@silent valley You may want to try changing the world times to doubles as well. But yeah CMC needs to be dug through a bit to see if there is a bug.

unkempt tiger Jan 3, 2021, 4:46 PM

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Why is it that my old UPROPERTY value lingers into newly replicated states, even if that's not what the server sent? I don't understand what's going on

📎 unknown.png

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This is where my problematic value is at, I'm fairly sure the UPROPERTY chain is intact and all setup as it should be

📎 unknown.png

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Tried to make the first picture as descriptive of the problem as I could, but the gist of it is that the WeaponEquipTarget continues to be the old value and only updates to the correct value after about 3 more OnRep calls

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I made sure to declare the structs with the Atomic specifier too

edgy sedge Jan 3, 2021, 5:48 PM

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Are you supposed to be able to find locally hosted (separate instances) Steam sessions? The FindSessions call is repeatedly returning 0 results on the client instance when the other is hosting 😕

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When I use my own steam appid I get nothing. When I use 480 I get a couple of log lines about mismatching unique build IDs, with one being zero and one being the correct build id - somehow they satisfy my search filters which is odd but oh well.

twin juniper Jan 3, 2021, 6:02 PM

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kindred widget GameState is available for all clients, and also very easy to get a reference to...

thanks for your help it worked out well

silent valley Jan 3, 2021, 6:45 PM

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edgy sedge Are you supposed to be able to find locally hosted (separate instances) Steam se...

I actually had no success with hosting a Steam session on the same network as my client. It wasn't until my instance was in the cloud that I started seeing the session appear 🤷

silent valley Jan 3, 2021, 6:47 PM

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jolly siren <@!485009514253516800> You may want to try changing the world times to doubles a...

The thought of changing World time to double and all the knock on effects is terrifying tbh 😂

edgy sedge Jan 3, 2021, 6:49 PM

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silent valley I actually had no success with hosting a Steam session on the same network as my...

Yep, I've tried so hard to trick it. I think I'll just try renting a pc on Shadow to test out my steam networking impl separately.

silent valley Jan 3, 2021, 6:50 PM

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thinking out loud but maybe a VPN would work?

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because it is a PITA to have to upload a new build everytime to test something

edgy sedge Jan 3, 2021, 6:51 PM

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The issue is that they're sharing a Steam client instance, I believe. I could use a VM and maybe that would work, with shared folder. That might work too

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VM + Steam Client + VPN would definitely work. But yeah I have really poor upload speeds (850 down / 30 up lol)

silent valley Jan 3, 2021, 6:54 PM

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idk, I have a second machine on my network and I just could not get the games to connect (different steam users logged in and everything).
Actually... I just remembered I think I DID see the game session when I used a second machine, but I could not connect to it (gave a strange steam error).

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but that was a while ago and I might have misconfigured something.
As soon as I hosted on an AWS instance everything started working tho.

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I saw a blog post about using WSL on Windows 10 to host a linux dedicated server (essentially it runs in a VM in windows)

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but beware - getting linux dedicated server build to work with Steam is also quite involved

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should be straightforward to create a windows VM using something like Virtualbox and use that tho

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wow looks like Microsoft offer a prebuilt VM :)
https://developer.microsoft.com/en-us/windows/downloads/virtual-machines/

bold wing Jan 3, 2021, 7:20 PM

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Heya, just starting out with networked multiplayer here. I have a custom pawn with custom movement (nothing fancy) and when playing it on a listen server on the same computer I see a lag of roughly 150ms or so. Is that normal?

unkempt tiger Jan 3, 2021, 7:21 PM

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if its local there should be way less lag unless you have some network emulation turned on

bold wing Jan 3, 2021, 7:22 PM

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I tried doing some tests with the standard character and don’t see that lag, but with my custom pawn I do. Does the character have some additional code built-in?

unkempt tiger Jan 3, 2021, 7:22 PM

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What is your custom pawn?

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Does it use the CMC internally?

bold wing Jan 3, 2021, 7:23 PM

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It’s just a spaceship pawn that I’ve built, so no

unkempt tiger Jan 3, 2021, 7:23 PM

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how are you networking its movement?

bold wing Jan 3, 2021, 7:23 PM

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It is moving based on ‘speed’ which gets added to its transform each tick

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I am using the smoothSync plugin right now

unkempt tiger Jan 3, 2021, 7:24 PM

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that explains it

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Smooth sync can't assume anything about what's being moved

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so the best it can do is perform interpolation over transform snapshots

bold wing Jan 3, 2021, 7:24 PM

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Assume = predict?

unkempt tiger Jan 3, 2021, 7:25 PM

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In a sense, yeah

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Anyways interpolation over transforms will always add more lag than other more involved solutions like what CMC offers

bold wing Jan 3, 2021, 7:25 PM

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I thought it was only lerping if it had to, I’m sending data 30 times/sec

unkempt tiger Jan 3, 2021, 7:26 PM

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its lerping all the time

bold wing Jan 3, 2021, 7:26 PM

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Do you have any recommendations to solve this?

unkempt tiger Jan 3, 2021, 7:26 PM

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and for it to lerp, it needs to be at least one 'snapshot' behind

bold wing Jan 3, 2021, 7:27 PM

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Right, I just thought locally it would never be behind much at all hence not lerping much... :/

unkempt tiger Jan 3, 2021, 7:27 PM

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i see two solutions: 1. hack your way using CMC to fake your character's movements as if it was a spaceship, the second is write an entire movement solution in CPP

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The local client isn't doing any prediction because smooth sync is dictating its location

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So essentially your local client becomes as good as any other observing client lag-wise

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There's also a third option of trying to hack prediction in by disabling smooth sync replication for the local client but that'll be jittery unless you somehow nail it

bold wing Jan 3, 2021, 7:29 PM

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What about the ‘replicate movement’ option? Shouldn’t that automatically replicate my pawn in a decent way?

unkempt tiger Jan 3, 2021, 7:30 PM

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The most elegant solution would be a client authority approach: the client tells the server where the ship is at, and now the SERVER is the one doing the interpolation (as well as observing clients)

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I believe it's not going to be smooth

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Replicate movement - afaik - will always be an immediate snap unless its the default Character that uses CMC

bold wing Jan 3, 2021, 7:31 PM

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My initial tests were not good with replicate movement, that’s why I went with smoothSync - but if the latter introduces lag then that’s not good either.

unkempt tiger Jan 3, 2021, 7:31 PM

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it's bound to, yeah

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in a perfect world, where there is no RTT variations and no packet loss (but still RTT > 0), smoothsync-like solutions will always have a lag of 1/UpdateRate

bold wing Jan 3, 2021, 7:33 PM

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Rebuilding my 2d ship with a character class seems hacky as fudge but I might give it a go. My ship is a ‘asteroids’ type pawn

unkempt tiger Jan 3, 2021, 7:34 PM

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I've heard of those hack like solutions being done before

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Pretty sure you could get away with making the character's capsule into a sphere and work from there

bold wing Jan 3, 2021, 7:34 PM

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What is it inside the CMC that makes it work so much better?

unkempt tiger Jan 3, 2021, 7:35 PM

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its mainly a bunch of assumptions suited for a bipedal character

bold wing Jan 3, 2021, 7:35 PM

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I mean in terms of networking?

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I’m not skilled enough to go into C++ for this but am curious

unkempt tiger Jan 3, 2021, 7:36 PM

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the networking approach is: send a position, immediately snap to that position, and - rather than interpolation (whcih is what smooth sync is doing), extrapolate (by considering the character's velocity)

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so that... by the time the next position arrives, the character will already be at that position (or close enough)

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this of course only works under the assumption that the character didn't change its velocity by the time the next position arrives

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if it did - you get a snappy jitter, because the extrapolation resulted in an incorrect position

bold wing Jan 3, 2021, 7:37 PM

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Which means I will need to work with velocity when rebuilding the ship’s movement I guess

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Thanks for all the answers by the way, extremely helpful

unkempt tiger Jan 3, 2021, 7:39 PM

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sure, good luck 👍

bold wing Jan 3, 2021, 7:40 PM

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And this all makes perfect sense, I just wish ‘replicate movement’ on a pawn would have the same network code for extrapolation etc

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K, off to try rebuilding this whole thing. Thanks again 🙂

lucid vault Jan 3, 2021, 8:49 PM

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Is there any way to build a dedicated server without source? I'm having tons of issues with source right now, and I feel like switching back

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I'm wondering if perhaps a newer version of the engine supports dedi builds and the documentation hasn't been updated to reflect that

serene berry Jan 3, 2021, 9:09 PM

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I've started noticing that a client's player controller doesn't have certain references setup in BeginPlay such as GetPawn and StartSpot. Is there a reason for this?

serene berry Jan 3, 2021, 9:54 PM

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I answered my own question, those fields are set by game mode and only the server has one
Edit: My original statement was wrong, a connecting player's controller eventually has the StartSpot setup but it is not ready by BeginPlay.

meager spade Jan 3, 2021, 10:02 PM

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@lucid vault nope

kindred widget Jan 3, 2021, 11:22 PM

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I think it's more or less assumed that if you're building a dedicated server, you're going to be needing to do some engine modifications to support your game anyhow.

bold wing Jan 3, 2021, 11:48 PM

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I'm testing out a character with its CMC in a listen server scenario - I hear the CMC is meant to have prediction built in?

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If so, how do I test this? I've tried setting my packet loss emulation to 500ms and it just lags by the same amount, seemingly no prediction? :/

unkempt tiger Jan 3, 2021, 11:50 PM

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What do you mean packet loss set to 500ms? Packet loss is measured by percentage, and trip time is measured in ms

half jewel Jan 4, 2021, 12:09 AM

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can RPC's be sent out of order in either direction?

fossil spoke Jan 4, 2021, 12:16 AM

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Order is not guaranteed in any way.

bold wing Jan 4, 2021, 12:17 AM

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unkempt tiger What do you mean packet loss set to 500ms? Packet loss is measured by percentage...

Oh sorry I meant network latency is set to 500ms.. but it just looks like a delay of that number, no prediction

unkempt tiger Jan 4, 2021, 12:18 AM

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so if you say, press W, your screen doesn't move only until 500ms pass?

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in other words, by prediction do you mean that of the (controlling owner) local client?

bold wing Jan 4, 2021, 12:22 AM

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Yes if I press W on server or client it takes 500ms for either to move across the emulated network

dark edge Jan 4, 2021, 12:24 AM

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How long the ll it moves on their own screen?

bold wing Jan 4, 2021, 12:24 AM

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Controls are responsive on each, but I can’t figure out how to use UE’s CMC prediction.. so if my client moves the char should the server extrapolate at all?

meager spade Jan 4, 2021, 12:24 AM

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the server still has to wait for the input from the client

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before it can do any movement

bold wing Jan 4, 2021, 12:25 AM

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On their own screens it’s instant.

unkempt tiger Jan 4, 2021, 12:25 AM

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bold wing Controls are responsive on each, but I can’t figure out how to use UE’s CMC pred...

wait, I thought it took 500ms for you to see a response after an input?

meager spade Jan 4, 2021, 12:25 AM

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yes on there own screen it is instant

unkempt tiger Jan 4, 2021, 12:25 AM

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Oh, that's expected, that means prediction works

meager spade Jan 4, 2021, 12:25 AM

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that is prediction

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client sends that move to the server, server then moves

bold wing Jan 4, 2021, 12:26 AM

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Aaaaah

meager spade Jan 4, 2021, 12:26 AM

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if that takes 500ms, then server wont move till 500ms

bold wing Jan 4, 2021, 12:26 AM

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I think I misunderstood what it does, but that makes sense

unkempt tiger Jan 4, 2021, 12:26 AM

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the term prediction is reserved for the local client's prediction of their future state based off of their own inputs

bold wing Jan 4, 2021, 12:27 AM

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Thought it would extrapolate onto the other player’s screen, not just handle it instantly. Got it.

meager spade Jan 4, 2021, 12:27 AM

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server can not predict if a client is going to press what keys

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that would be impossible, unless it did some learning of that player 😄

bold wing Jan 4, 2021, 12:45 AM

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Lol true. It was more if the server would see a client input and know this was pressed 200ms ago, and therefore be able to predict where it should now be.

silent frost Jan 4, 2021, 12:58 AM

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So this is just an idea, and i would like your input on if you think its possible. So i'm working on this multiplayer game, where the players mostly run around and chat, and it quickly became only playable on very strong computers, But a lot of people with worse computer became interested. Do you think it could be possible to do a completely separate build of the game, where the players still connect to the same server as the original game, but only sees the other characters and some very basic meshes. They would kind of be like the ghosts of this world, just floating around and chatting.

unkempt tiger Jan 4, 2021, 1:03 AM

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I dont see why it should be a different build, you should be able to cull computations/resource usages through the settings

silent frost Jan 4, 2021, 1:09 AM

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im trying to make it run on my small laptop, with only integrated graphics, and i don't think its getting there, even in a super optimised state.

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you mean i could make a setting where i cull everything?

hollow eagle Jan 4, 2021, 1:29 AM

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Use LODs, HLODs depending on use-case, setup FX LODs, use material quality switches, turn down resolution scale, view distance, AA level, etc.. Lots and lots of ways to make the same game scale up and down, but that isn't a question for this channel at this point.

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That assumes lower-end systems are choking on issues those settings fix, of course. If it's your own code that's slowing things down then that's something only you can fix.

silent frost Jan 4, 2021, 1:48 AM

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well all of this would definitely help. I was just wondering if it was possible, like as a thought experiment. The way the game is now, the only thing that gets replicated are the players movement, and the chat. so if i deleted everything but those components, could i have a build of the game, with only those things, and could it communicate with the other build. or would it mess everything up. It could be interesting.

hot robin Jan 4, 2021, 1:50 AM

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What is the largest Terrain possible currently in Unreal Engine without shifting the origin? Also is there some place proper to read about Origin shifting in Multiplayer?

hollow eagle Jan 4, 2021, 1:51 AM

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silent frost well all of this would definitely help. I was just wondering if it was possible,...

Theoretically... yes, but the engine already provides plenty of ways to avoid having a completely new build - I fail to see why you'd want to do that. Use scalability settings and LODs, and if you really need to cut down on disk space just make a new pak file that only includes the lower-quality assets (which is something similar to what you'd be doing to ship on multiple platforms anyway)

silent frost Jan 4, 2021, 1:53 AM

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@hollow eagle yes, that would make sense 🙂 thanks

hollow eagle Jan 4, 2021, 1:54 AM

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hot robin What is the largest Terrain possible currently in Unreal Engine without shifting...

WORLD_MAX is ~20KM

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there's no built-in way to do origin rebasing in multiplayer and is something you'd have to write yourself

split siren Jan 4, 2021, 2:24 AM

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I have read Epic is using Chaos in Fortnite, but in the documentation there is no word about networking. Does Chaos have network replication built in?

peak sentinel Jan 4, 2021, 2:53 AM

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It has, but I just know it has, nothing more, maybe #legacy-physics knows better

cursive rivet Jan 4, 2021, 4:01 AM

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I am using advanced steam sessions and am wondering how to have someone join my session that is not lan. search sessions and the joining the found session works over lan but how to i make it so i can join a session hosted on someone elses wifi

vivid prawn Jan 4, 2021, 4:07 AM

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@cursive rivet use Hamachi (https://www.vpn.net/)

feral glacier Jan 4, 2021, 4:20 AM

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Has anyone ever come across this?

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Seems like i'm getting variables from other people's games playing "Spacewar"

📎 unknown.png

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Leads to this and unable to join session

📎 unknown.png