#multiplayer | Unreal Source | Page 452

winged badger Apr 3, 2019, 7:07 PM

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now when there with a breakpoint hit

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you go to Debug menu -> windows -> Locals

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then you can see every variable in scope, and its value

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so you expand the PawnToPossess, you find its Controller variable, expand that down the inheritance chain till you get to UObjectBase

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and then you can see flags on it

north swan Apr 3, 2019, 7:11 PM

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📎 unknown.png

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thanks for your help mate, i'm learning something today 😄

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oh my

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I think I may have it

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(this helped me: https://stackoverflow.com/questions/25893840/how-to-avoid-unable-to-read-memory)
I didn't initialize the values in my info array with nullptrs

Stack Overflow

How to avoid "unable to read memory"

I have a struct:

struct a {
a(){};
a(int one,int two): a(one),b(two){};
int a;
int b;
int c;
}

a * b;
cout << b->c;
And sometimes when i want to read (for ex.) c and in

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now I have another error, but I'll try myself first. thanks to everyone helping!

meager spade Apr 3, 2019, 8:07 PM

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@north swan i did say you need to clear the controller from the pawn

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that normally happens when you call Detachfromcontrollerpendingdestroy

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{
    if ( Controller != NULL && Controller->GetPawn() == this )
    {
        Controller->PawnPendingDestroy(this);
        if (Controller != NULL)
        {
            Controller->UnPossess();
            Controller = NULL;
        }
    }
}```

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controller is still pointing somewhere so its not invalid (not a nullptr), but its pointing to garbage

north swan Apr 3, 2019, 9:03 PM

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@meager spade I'll try that tomorrow, thanks!

unreal pine Apr 4, 2019, 12:33 AM

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you guys mind if I ask blueprint related multiplayer questions in here? 😃

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I'm calling the same function on a bullet kill as I call from a melee kill, only thing that changes is launch velocity (for the dying character) but for some reason the server and client don't match only on a melee kill
https://gfycat.com/pinkeasygoingbrocketdeer
(Left side server, right client)

Gfycat

Desktop 2019.04.03 - 20.10.01.01 1

▶ Play video

jolly siren Apr 4, 2019, 1:24 AM

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Has anyone done something like PredictProjectilePath but for character movement?

grand kestrel Apr 4, 2019, 1:29 AM

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What for? Jumping?

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Characters change direction with input, projectiles usually are more.. predictable

jolly siren Apr 4, 2019, 1:30 AM

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I'm working on a melee that lunges at the enemy. I'm trying to make it not attempt the lunge if it is going to miss (because of collision, the target moving, etc)

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So I want to run a prediction simulation ahead of the real melee

grand kestrel Apr 4, 2019, 1:31 AM

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Trace to the enemy, where it would hit, find the distance, find how long it takes to traverse that distance (based on anim speed, I guess), tick forward the enemy, offset the trace loc by the difference between forward/current ticked enemy, see if it still hits? & tick them back after..

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Roughly

raven holly Apr 4, 2019, 1:31 AM

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MP sometimes sucks

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📎 unknown.png

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Anyone know why this would be happening when attaching to a socket on server?

grand kestrel Apr 4, 2019, 1:32 AM

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You never know if the enemy is going to change direction into something that would result in a hit, though

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But if it all goes down fast enough, you can just provide them with the hit if it was predicted to hit, if you want to be sure it never misses

jolly siren Apr 4, 2019, 1:33 AM

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Yeah, that's what I'm going for. I don't want it to ever miss if it performs the lunge

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Because it tracks the player and lunges at them per tick

grand kestrel Apr 4, 2019, 1:33 AM

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I've never tried ticking forward a character though, they're reasonably complex, you'd only ever do it on server and rewind it instantly after, definitely needs testing

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If not then just draw their hitbox based on velocity/time to hit

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Well, nevermind the part about only doing it on server

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You definitely gotta test that first 😄

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If you tick them forward then restoring their state might be troublesome

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TBH probably less complex to draw something based on velocity and time to hit

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So if you know the point in the animation when it connects, the start->that point is the time to hit

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Then take the enemy velocity (optionally factor their acceleration to predict if they'll slow/speed up later), find where that places them 'time to hit' seconds in the future, and see if they'll still be in the lunge trajectory at that time?

jolly siren Apr 4, 2019, 1:38 AM

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Right, yeah I've been trying to think about how to do the prediction

grand kestrel Apr 4, 2019, 1:39 AM

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If you want it to initiate on the client you're going to also need to factor in latency

jolly siren Apr 4, 2019, 1:39 AM

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Right, yeah I am initiating on the client

grand kestrel Apr 4, 2019, 1:39 AM

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Personally I would store each player's positions for a time

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And rewind them on the server based on the latency of the instigator

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And then predict them forward based on the lunge

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Only thing is potential error between server/client, esp. with enemy players changing direction mid-lunge

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That the local player wouldn't be aware of and the server would

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But the rewind should help with that a lot

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Just be prepared for some rare edge cases I guess 🤷

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Though those should only occur if their latency is very high and outside of whatever compensation threshold you set

jolly siren Apr 4, 2019, 1:43 AM

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Yeah that makes sense. I'll try to put something like that together

grand kestrel Apr 4, 2019, 1:44 AM

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Oh, for storing player positions look at UT

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Find All References on FSavedPosition

grizzled stirrup Apr 4, 2019, 2:52 AM

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Do players need to manually open ports or other custom work if joining a friend via steam, or does UE4 / steamworks handle that automatically?

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Peer to peer btw

gleaming niche Apr 4, 2019, 2:55 AM

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using steam sockets does it automatically.

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when you connect to a steam id

grizzled stirrup Apr 4, 2019, 2:59 AM

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Great thank you

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Is it much work to use / implement steam sockets, or can it be picked up fairly easily?

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I understand networking inside of UE4 very well but when it comes to external stuff I'm lost quite easily

grand kestrel Apr 4, 2019, 3:05 AM

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Me too somewhat. I'm fine being a gameplay dev and leaving other stuff to other people. Don't have the time to learn everything

grizzled stirrup Apr 4, 2019, 3:08 AM

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It's definitely not possible without a lot of extra effort and time

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That said I'd like to at least be able to understand it- imagine launching an MP game based on code you don't really get in order to link steam players- would be a real shame if the game kicked ass but there were issues there

grand kestrel Apr 4, 2019, 3:09 AM

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Yeah of course

thin stratus Apr 4, 2019, 5:52 AM

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@grizzled stirrup Well the whole NAT Punch Through stuff happens without any implementation of SteamSockets on your end.

gleaming niche Apr 4, 2019, 8:02 AM

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iirc wwhen you use steam subsystem, and sessions, it connects via the steam stuff.

bitter oriole Apr 4, 2019, 8:05 AM

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I suspect it does when you use the Steam net driver

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Which is required for Steam OSS

thin stratus Apr 4, 2019, 8:26 AM

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It should still need to perform the NAT Punch Through

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Cause even the Steam Socket stuff is using a Port that might not be open on the host

bitter oriole Apr 4, 2019, 8:31 AM

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Doesn't Steam handle the NAT punch ?

thin stratus Apr 4, 2019, 8:32 AM

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Yeah

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But that's why you would need to use Steam or any other subsystme that does that for you

bitter oriole Apr 4, 2019, 8:33 AM

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Yeah, I guess if you want to do your own OSS, NAT is the least of your problems

thin stratus Apr 4, 2019, 8:33 AM

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Well if you create a backend for ServerLists

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And you want to support ListenServers

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Then you need NAT PunchThrough

bitter oriole Apr 4, 2019, 8:34 AM

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Yeah

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I'm just saying most MP games use the concept of friends etc

thin stratus Apr 4, 2019, 8:35 AM

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Even that needs it?

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Every package is goin to be rejected otherwise

bitter oriole Apr 4, 2019, 8:35 AM

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Sorry, let me rephrase

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If you're making a MP game today and don't want to use Steam OSS or the upcoming Epic OSS, you probably have more work ahead of you than just NAT punch - needing server lists, friends, etc

thin stratus Apr 4, 2019, 8:36 AM

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Oh, yeah

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Totally

modest hedge Apr 4, 2019, 8:38 AM

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I got a quick question,
If I have a function that I only ever plan to call on the server, should I still mark it as a Server RPC in the UFUNCTION macro to prevent clients from calling it or should I just leave it out.

thin stratus Apr 4, 2019, 8:39 AM

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You don't use RPC macros for that

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You would do an Authority check at the start of the function

modest hedge Apr 4, 2019, 8:40 AM

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I totally forgot about that

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Thanks for reminding me

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and there is also BlueprintAuthorityOnly too isn't there

thin stratus Apr 4, 2019, 8:42 AM

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That is to mark them as Authority only in BPs

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They get that little node

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Idk if that ever stops clients from calling it

modest hedge Apr 4, 2019, 8:44 AM

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This is what I found

📎 unknown.png

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so I think it's safe

pallid mesa Apr 4, 2019, 10:58 AM

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apparently OnlineSessionAsyncServerSteam changed, and now lets you define UE4_PROJECT_STEAMPRODUCTNAME and similars on the target.cs of your project

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does anyone have a cs example for a 4.22 steam config?

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I don't want to miss anything (just in case)

scenic raven Apr 4, 2019, 12:55 PM

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When I set my Play button to Standalone and set multiple players, it won't work for me anymore

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I just get 1 player

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do you know why this could happen or if it can be a 4.22 bug?

bitter oriole Apr 4, 2019, 12:57 PM

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What happens exactly ? No second window opens ?

scenic raven Apr 4, 2019, 1:01 PM

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yep

bitter oriole Apr 4, 2019, 1:01 PM

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That does sound like a bug

jolly siren Apr 4, 2019, 1:02 PM

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Uncheck use a single process

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In the advanced play settings

bitter oriole Apr 4, 2019, 1:03 PM

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What happens if you check that and start MP ? 2nd player is spawned but no viewport ?

jolly siren Apr 4, 2019, 1:03 PM

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And then specify the Editor Multiplayer Mode

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No it only spawns one player/viewport with it checked

scenic raven Apr 4, 2019, 1:05 PM

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Will try it thx

jolly siren Apr 4, 2019, 1:05 PM

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np

ember needle Apr 4, 2019, 1:30 PM

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Back with my lobby issues. I rewrote the whole thing, and I still experience the same bug: map doesn't open when joining. I finally saw something in the logs:
Warning: UNetDriver::ProcessRemoteFunction: No owning connection for actor BP_OSA_GameState_C_0. Function ServerChangeMap will not be processed

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basically: clients do not travel, and the BeginPlay event on the level that is supposed to be loaded... doesn't.

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blank screen.

thin stratus Apr 4, 2019, 1:40 PM

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ServerChangeMap

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Is that your function?

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@ember needle

ember needle Apr 4, 2019, 1:40 PM

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Yes, let me gather some full info

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to not make you lose time.

thin stratus Apr 4, 2019, 1:41 PM

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Don't need to

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I guess this is a ServerRPC

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Inside of the GameState

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That doesn't work

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GameState isn't owned by Clients

north swan Apr 4, 2019, 1:42 PM

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is there a function I can override where a player disconnects but I can still get his old GetPlayerNetworkAddress(); ?
if I try to get it on GameMode->Logout() the playerController is valid but his network address is already gone

thin stratus Apr 4, 2019, 1:42 PM

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So ServerRPCs won't work in there, neither will ClientRPCs. Only Multicasts. @ember needle

jolly siren Apr 4, 2019, 1:44 PM

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@north swan Is it gone before the super::logout call?

north swan Apr 4, 2019, 1:44 PM

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yes

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weirdly enough

jolly siren Apr 4, 2019, 1:45 PM

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Why don't you use UniqueId instead of NetworkAddress?

north swan Apr 4, 2019, 1:45 PM

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does uniqueID persist between disconnects and reconnects?

jolly siren Apr 4, 2019, 1:46 PM

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yes

north swan Apr 4, 2019, 1:46 PM

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oh damn

jolly siren Apr 4, 2019, 1:46 PM

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In CopyProperties

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void APlayerState::CopyProperties(APlayerState* PlayerState)
{
    PlayerState->Score = Score;
    PlayerState->Ping = Ping;
    PlayerState->ExactPing = ExactPing;
    PlayerState->PlayerId = PlayerId;
    PlayerState->SetUniqueId(UniqueId.GetUniqueNetId());
    PlayerState->SetPlayerNameInternal(GetPlayerName());
    PlayerState->StartTime = StartTime;
    PlayerState->SavedNetworkAddress = SavedNetworkAddress;
}

north swan Apr 4, 2019, 1:46 PM

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🙄 huge thanks, I'll try!

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i need to check the source more

jolly siren Apr 4, 2019, 1:47 PM

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yeah, it's always easier to check the source 😃

ember needle Apr 4, 2019, 1:48 PM

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@thin stratus yeah no that's not it, not an RPC. This is called on the server.

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When game start, level OSA_Menu_Level_Main is open. GameMode is BP_OSA_GameMode_Menu and has Use Seamless Travel set to true. Server starts in host:
https://gyazo.com/a7574a091ee4dce663bdae21a4fd9ff1

Gyazo

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So server is now on level OSA_Menu_Level_SlotSelection which has the same GameMode.

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Clients starts, so level OSA_Menu_Level_Main open with GameMode BP_OSA_GameMode_Menu. It finds available hosts with:
https://gyazo.com/5ce949077b928be603f179daede1d883

Gyazo

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Clients connects to host with:
https://gyazo.com/ea24e604fdfd87a953a5775d3724cb79

Gyazo

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Server can see the Client in the list of players in the Lobby. Client sees either a blank screen (BeginPlay even is never called for the OSA_Menu_Level_Main level), or it sees the level but everything is disabled.

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It's obliviously something I am doing wrong

thin stratus Apr 4, 2019, 1:50 PM

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Menu GameModes shouldn't have SeamlessTravel. OpenLevel is a HardTravel, so it makes no sense to set it to Seamless.
And "SlotSelection" should not have the same GameMode as the Menu.

ember needle Apr 4, 2019, 1:50 PM

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-> it is like this so you can travel back from a game to the lobby.

thin stratus Apr 4, 2019, 1:50 PM

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That has nothing to do with that

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I can go from Game to Lobby just fine with my GameMode setup

ember needle Apr 4, 2019, 1:50 PM

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without having players disconnecting...?

thin stratus Apr 4, 2019, 1:51 PM

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Your Menu has nothing to do with Multiplayer?

ember needle Apr 4, 2019, 1:51 PM

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it's only for multiplayer

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it's the lobby

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where players chose their role

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which is saved on the playerstate

thin stratus Apr 4, 2019, 1:51 PM

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Your MainMenu Level

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Should not share a GameMode

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With any Networked Levels

north swan Apr 4, 2019, 1:52 PM

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@jolly siren wait, can't i just override PlayerState->CopyProperties() and add the other actors I want to save? that would make my life much easier. is it usually done this way?

ember needle Apr 4, 2019, 1:52 PM

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MainMenu is both for menu and the lobby

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AH

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so I need 3 gamemodes? 1 for offline, 1 for lobby, 1 for game?

thin stratus Apr 4, 2019, 1:52 PM

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Level MainMenu: GameMode_MainMenu. No Multiplayer. No SeamlessTravel.
Level Lobby: GameMode_Lobby. Multiplayer. SeamlessTravel.
Level Game: GameMode_Game. Multiplayer. SeamlessTravel.

ember needle Apr 4, 2019, 1:52 PM

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and lobby and game should have seamless

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Got it

thin stratus Apr 4, 2019, 1:52 PM

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GameMode_Lobby and GameMode_Game can share a parent

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GameMode_Gameplay or so

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Or GameMode_Online, whatever you like

ember needle Apr 4, 2019, 1:53 PM

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you think that could be it?

jolly siren Apr 4, 2019, 1:53 PM

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yes, CopyProperties is how you persist things across disconnects. I'm not sure about pointers tho

ember needle Apr 4, 2019, 1:53 PM

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interesting

thin stratus Apr 4, 2019, 1:53 PM

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Well, it#s def not good to fight the framework

north swan Apr 4, 2019, 1:53 PM

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@jolly siren could work If I keep the objects alive after the player disconnects

thin stratus Apr 4, 2019, 1:53 PM

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So I wouldn't use a Menu GameMode for offline and online

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Neither would I mark it seamless

ember needle Apr 4, 2019, 1:54 PM

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https://gyazo.com/45d9bf2989269507c2aa3ab0cfc64ab0

Gyazo

thin stratus Apr 4, 2019, 1:54 PM

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CopyProperties if for SeamlessTravel

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To move stuff from Level A to B

jolly siren Apr 4, 2019, 1:54 PM

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@north swan Correct. Just remember that it also happens during seamless travel

ember needle Apr 4, 2019, 1:54 PM

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this is on playerstate

thin stratus Apr 4, 2019, 1:54 PM

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It has nothing to do with reconnecting

ember needle Apr 4, 2019, 1:54 PM

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understood

thin stratus Apr 4, 2019, 1:54 PM

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For players disconnecting and reconnecting, you use OverrideWith

ember needle Apr 4, 2019, 1:54 PM

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ok so still 1 playerstate

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3 gamemodes, only the lobby and game ones with seamless

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will try this

north swan Apr 4, 2019, 1:55 PM

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@thin stratus is the PlayerState->UniqueId still the property I can identify a player who's reconnecting with?

thin stratus Apr 4, 2019, 1:55 PM

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I would have the online modes share parent classes

ember needle Apr 4, 2019, 1:55 PM

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understood

thin stratus Apr 4, 2019, 1:55 PM

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Even PlayerCOntroller and PlayerStates

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Then you can easily move data between those

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PlayerControllers persist in SeamlessTravel via OnSwapPlayerControllers in the GameMode

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So everything that both PS or PC have (like selected character) goes into the parent class

ember needle Apr 4, 2019, 1:56 PM

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ok will first refactor gamemode

thin stratus Apr 4, 2019, 1:56 PM

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Right

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@north swan The UniqueID comes from the underlying subsystem

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If you use, e.g., steam, you have a uniqueID, the steamID

ember needle Apr 4, 2019, 1:56 PM

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i hope i'll make it work. otherwise i'll find a contractor to fix this. 14 months of work are blocked unfortunately.

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should be the stupidest thing ever

thin stratus Apr 4, 2019, 1:57 PM

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Hehe, I fix this stuff for a living

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If you need a kickstart, my Lobby System is on the Marketplace ;)

north swan Apr 4, 2019, 1:57 PM

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thanks erebel/exi

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!

ember needle Apr 4, 2019, 1:57 PM

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i'm not a company... probably can't afford you but will write to you an MP...

thin stratus Apr 4, 2019, 1:57 PM

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Might actually be on sale

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I don't manage our companies sales

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Let me check real quick

ember needle Apr 4, 2019, 1:58 PM

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salty?

thin stratus Apr 4, 2019, 1:58 PM

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Yeah

ember needle Apr 4, 2019, 1:58 PM

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https://www.unrealengine.com/marketplace/en-US/slug/lobby-chat-group-and-more

Multiplayer Lobby Kit by Salty Panda Studios U.G in Blueprints - ...

Multiplayer Lobby with MainMenu, Settings, Host/Find/Join Session, Lobby, Character Customization. Using SeamlessTravel (4.20+) for Steam and allows Listen- and DedicatedServers.

thin stratus Apr 4, 2019, 1:58 PM

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Yop

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4.20 upwards is the refactored version

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@north swan I'm pretty sure Epic already does exactly that to give you your old PlayerState

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PlayerStates go into inactive mode if a player leaves

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Allowing to get their stats back if they reconnect in time

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The lifeTime can probably be extended or set to 0 to be unlimited

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Think that's a setting in either the playerstate or gamemode

north swan Apr 4, 2019, 2:00 PM

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oh wow are you kidding me

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😄

thin stratus Apr 4, 2019, 2:00 PM

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That's what the OverrideWith function is

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I found that so useful that I exposed it to Blueprints for Epic

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Specially CopyProperties

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No idea why that wasn't exposed

jolly siren Apr 4, 2019, 2:03 PM

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CopyProperties can be used for persisting across disconnects too.
AGameMode::LogOut -> AddInactivePlayer -> Duplicate -> PS::DispatchCopyProperties -> PS::CopyProperties is the call stack

thin stratus Apr 4, 2019, 2:03 PM

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Or really?

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Ah I see

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It copies from old to inactive

jolly siren Apr 4, 2019, 2:04 PM

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Yes, it copies the values

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Correct

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And then restores those values on reconnection

thin stratus Apr 4, 2019, 2:04 PM

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I thought that is one and the same o.o

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Weird, how do you know if it's called from a travel or to save data?

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maybe there is data you don't want to save on travel, but on reconnect o.o

jolly siren Apr 4, 2019, 2:05 PM

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That is what Reset() is for

thin stratus Apr 4, 2019, 2:05 PM

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Guess you can also check if that PlayerState you are in is inactive

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I actually never setup a reconnect system. Just knew the OverrideWith was called

jolly siren Apr 4, 2019, 2:05 PM

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You can set the properties back to default in Reset if you don't want them to persist across travels

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but do want them to persist across disconnects

thin stratus Apr 4, 2019, 2:06 PM

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Fair enough

north swan Apr 4, 2019, 2:06 PM

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thanks guys, it's enlightening to talk to you 🙏

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or to hear both of you talk haha

jolly siren Apr 4, 2019, 2:06 PM

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It's just different approaches. Really either way will work

thin stratus Apr 4, 2019, 2:06 PM

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Yeah there is so much knowledge in our heads by now, we could never stop typing haha

jolly siren Apr 4, 2019, 2:07 PM

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haha yeah this channel is my home ❤ It's good to cross pollinate as much as we can here.

thin stratus Apr 4, 2019, 2:07 PM

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You know that I constantly picture you sitting in front of the desk with exactly that smile?

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It's really weird

jolly siren Apr 4, 2019, 2:07 PM

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ahahahahah

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That is hilarious

thin stratus Apr 4, 2019, 2:08 PM

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Imagine that person, that is always just smiling, with exactly the same face.

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No matter what happens

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Creepy, yet funny

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:D Not calling you creepy haha

jolly siren Apr 4, 2019, 2:09 PM

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lmao 🤣

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My brother would always have a huge smile on his face when we would game together growing up. I would look over and start laughing at him.

pallid mesa Apr 4, 2019, 2:09 PM

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did any of you two guys played around with steam on 4.22. Apparently (finally), we can now define things like UE4_PROJECT_STEAMPRODUCTNAME on the target.cs file. (That's what the docummentation claims). But there is not a single example out there D: ~

thin stratus Apr 4, 2019, 2:09 PM

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I only today downloaded 4.22

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Not even touched it yet

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Client is still on 4.20

pallid mesa Apr 4, 2019, 2:10 PM

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I'm on the process aswell, however I'm in that step of editing or not the source code of the engine

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haha it seems I don't need to on this version

thin stratus Apr 4, 2019, 2:10 PM

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https://i.imgur.com/Rf6lIuH.gifv

Imgur

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Ethan when typing

pallid mesa Apr 4, 2019, 2:10 PM

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rofl

thin stratus Apr 4, 2019, 2:10 PM

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Okay, enough, sorry

pallid mesa Apr 4, 2019, 2:11 PM

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😂

thin stratus Apr 4, 2019, 2:11 PM

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Yeah I read it too

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The new target.cs exposed stuff

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Did you just try doing it?

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/* Server values needed to advertise with Steam (NOTE: Steam expects UTF8)
 *
 * Specify these in your Target.cs files for your project.
 * Make sure to escape the strings!
 * If these do not match the same values on the Steam partner backend, 
 * matchmaking will not work for your dedicated server
 */
#ifndef UE4_PROJECT_STEAMPRODUCTNAME
#ifdef STEAMPRODUCTNAME
UE_DEPRECATED(4.22, "The Steam Product Name Macro has been updated to be configurable from your Target.cs file. Please change STEAMPRODUCTNAME to UE4_PROJECT_STEAMPRODUCTNAME.")
#define UE4_PROJECT_STEAMPRODUCTNAME STEAMPRODUCTNAME
#else
#define UE4_PROJECT_STEAMPRODUCTNAME "unrealdk"
#endif
#endif

pallid mesa Apr 4, 2019, 2:12 PM

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thing is I don't know how to - but don't say it out loud, I suck with cs files I always end up copying them and editing them looking at examples, it is something I really need to... hum improve

thin stratus Apr 4, 2019, 2:13 PM

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To translate that: if UE4_PROJECT_STEAMPRODUCTNAME is not defined already by you

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And you have STEAMPRODUCTNAME

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IT corrects you but still uses STEAMPRODUCTNAME

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Which I didn't even know existed

pallid mesa Apr 4, 2019, 2:13 PM

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nono I understand, thing is that you need to make it on the CS

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which is c#

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not c++

thin stratus Apr 4, 2019, 2:13 PM

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oh

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Wait a second

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Can you check if this works

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AddDefinition("UE4_PROJECT_STEAMPRODUCTNAME=YourProductName");

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Something like that

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I know it works in the Build.cs

pallid mesa Apr 4, 2019, 2:15 PM

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the answer will be delayed, but I think I can, I'll keep you guys posted in case you all want to transfer everything to 4.22

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anyways, compiling 4.22 thank you for the heads up!

north swan Apr 4, 2019, 2:21 PM

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I guess I'm doing something wrong: just to test the uniqueId stuff, I saved the playerState->UniqueId in a variable upon first connection.
when the player disconnects and reconnects, the new uniqueId is not the same as the old one

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did I forget a step between?

thin stratus Apr 4, 2019, 2:22 PM

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You are using Steam or so?

north swan Apr 4, 2019, 2:22 PM

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nope

thin stratus Apr 4, 2019, 2:23 PM

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SubsystemNull has no Unique ID

#

At least none that persists outside the game

north swan Apr 4, 2019, 2:23 PM

#

oh

thin stratus Apr 4, 2019, 2:23 PM

#

You gotta have a backend with unique users :P

north swan Apr 4, 2019, 2:23 PM

#

okay I'll implement steam and try again, see ya in a week

thin stratus Apr 4, 2019, 2:23 PM

#

hehe

north swan Apr 4, 2019, 2:23 PM

#

jk haha, i'll see 😄

ember needle Apr 4, 2019, 2:30 PM

#

@thin stratus unfortunately that wasn't it. So tired, it's been months.

#

If I record the thing with Gyazo (screen capture) then IT WORKS. If I don't, then no.

#

I start with these options (standalone mode):
https://gyazo.com/629cdd563511006e110e14cf97d14175

Gyazo

#

when I do that, then one window is blocked until I close the other one

#

that's when just OPENING THE GAME...

#

https://gyazo.com/9ae9832ace99b0b4ab8c8740f7b70aab

Gyazo

▶ Play video

thin stratus Apr 4, 2019, 2:35 PM

#

Either start htem by hand via the uproject file

#

Or stick to one process for now

#

Make sure to toggle off auto connect though

ember needle Apr 4, 2019, 2:35 PM

#

I cannot toggle it if I set Do not run in a single proc

#

So.. I start it with a script:

start "" "C:\Program Files\Epic Games\UE_4.21\Engine\Binaries\Win64\UE4Editor.exe" "D:\UNREAL\OneStepAhead\OneStepAhead.uproject" -game -NOSTEAM -windowed -ResX=1024 -ResY=768
start "" "C:\Program Files\Epic Games\UE_4.21\Engine\Binaries\Win64\UE4Editor.exe" "D:\UNREAL\OneStepAhead\OneStepAhead.uproject" -game -NOSTEAM -windowed -ResX=1024 -ResY=768

thin stratus Apr 4, 2019, 2:35 PM

#

That's why I said

#

Use single process

#

OR, rightclick the uproject file

#

And hit Launch game

ember needle Apr 4, 2019, 2:36 PM

#

and then I experience what I tell you: the blocking happens when the client tries to open the map

thin stratus Apr 4, 2019, 2:36 PM

#

So your Menu Gamemode is now not seamless travel anymore?

ember needle Apr 4, 2019, 2:36 PM

#

correct

thin stratus Apr 4, 2019, 2:36 PM

#

The right one is the client?

ember needle Apr 4, 2019, 2:37 PM

#

BP_OSA_GameMode_Menu_MASTER has two children:

BP_OSA_GameMode_Menu_Offline
BP_OSA_GameMode_Menu_Online

#

the first one is not seamless travel, second one is

thin stratus Apr 4, 2019, 2:37 PM

#

Right

#

Which of the windows is client?

ember needle Apr 4, 2019, 2:38 PM

#

both

#

no server yet

#

https://gyazo.com/f9d838e8a650d8591040d29968dbadf7

Gyazo

#

is there anything I can try. I know this will now die here, again.

#

it's the stupidest setup EVER.

thin stratus Apr 4, 2019, 2:47 PM

#

If you press play

#

You already have that blocking window?

#

Not even clicked anything in the game?

ember needle Apr 4, 2019, 2:47 PM

#

exactly.

#

and in the logs I see that they are trying to connect.

bitter oriole Apr 4, 2019, 2:49 PM

#

Which one is hanging, server or client ?

#

Client should hang at connection when connecting to the lobby at first

#

Server shouldn't hang at all

real yacht Apr 4, 2019, 2:50 PM

#

i have question: currently my client is connecting on dedicated server with ip adress, and for now, i dont want to use steam subsystem. Can i create sessions with subsystem null in ue4? i mean is that possible without using any other subsystem?

ember needle Apr 4, 2019, 2:50 PM

#

they are launched in standalone. noone is the server yet.

bitter oriole Apr 4, 2019, 2:51 PM

#

@real yacht Online subsystem null is LAN only, for debugging. If you want sessions and avoid IP addresses you need Steam, GOG, or the upcoming Epic subsystem, or your own service

real yacht Apr 4, 2019, 2:51 PM

#

okay, thnx

north swan Apr 4, 2019, 2:52 PM

#

anyone got a ue4-steam-dedicated server "guide" thing for 4.20 or newer?

cinder quartz Apr 4, 2019, 2:58 PM

#

Hello everyone. I'm learning multiplayer with UE4. Already did Tom Looman's course where we did shooting with Replicated UPROPERTY and OnRep function. Now on my own prototype I'm using RPC multicast and end result is the same. So my question is, is there a "proper" way doing this? Which one should I use, RPC multicast or OnRep ?

bitter oriole Apr 4, 2019, 3:00 PM

#

OnRep is meant to trigger on replication of values, and only works server to client

#

RPC works both ways and is easier to understand as an event

#

But overall it is up to you

meager spade Apr 4, 2019, 3:00 PM

#

so way i look at it is

#

RPC should be for instant relevant stuff

#

OnRep should be used for persistant states etc

#

say i have a chest

#

it plays particle when chest is open, that would be RPC

cinder quartz Apr 4, 2019, 3:01 PM

#

In the Tom's course, the OnRep was "triggered" by some aim values, so it didnt work if I didnt move at all, but i fixed it by replicating int32 TotalShots, so now I'm just using telling the server that I wanna shoot and it handles the rest and multicasts

meager spade Apr 4, 2019, 3:01 PM

#

but the lid being opened would be a OnRep notify

#

so clients not relevant will see the lid open, but not see the particles

#

of the chest opening

#

when they become relevant

bitter oriole Apr 4, 2019, 3:02 PM

#

I would draw the line at RPCs for "events" that happen once in a while like firing, and onrep for regular, constant flow of changes like aiming

thin stratus Apr 4, 2019, 3:02 PM

#

You can actually put it in these two categories:

Fire and Forget
Late Joiners

#

Fire and Forget are events you don't care if someone gets them

#

Late Joines are people that join late or just come into relevancy range and you still need them to see the event

#

Usually States fit into the Late Joiners category

#

Cause they need to know the new state

#

Is the door open? is the chest open? is the weapon firing? etc.

meager spade Apr 4, 2019, 3:03 PM

#

yeah, so with the chest example, Lid Being opened would be a OnRep, meaning anyone not relevant, when they become relevant will see the lid open. Playing the particle of the lid open should be a RPC as you want that instant, and if someone not relevant become relevant, you dont want to play the lid opening particles again for an already opened chest

#

i think the content example has an example of that

thin stratus Apr 4, 2019, 3:03 PM

#

Actually, this is a weird example

meager spade Apr 4, 2019, 3:03 PM

#

and is def worth checking out

thin stratus Apr 4, 2019, 3:03 PM

#

Cause you'd play the particle as part of the animation

#

Which is triggered by the OnRep

meager spade Apr 4, 2019, 3:03 PM

#

would you though?

#

i wouldnt

thin stratus Apr 4, 2019, 3:04 PM

#

Why would I send a second RPC?

#

Makes no sense

meager spade Apr 4, 2019, 3:04 PM

#

i wouldnt want the chest to play the particles when someone becomes relevant

#

if the chest is already opened

thin stratus Apr 4, 2019, 3:04 PM

#

What particles are we talking about?

meager spade Apr 4, 2019, 3:04 PM

#

like a opening effect particles

thin stratus Apr 4, 2019, 3:05 PM

#

Ah, I thought you meant activating a glow or so indicating there is something in the chest

meager spade Apr 4, 2019, 3:05 PM

#

https://docs.unrealengine.com/en-us/Resources/ContentExamples/Networking/2_4

#

@cinder quartz ^

cinder quartz Apr 4, 2019, 3:06 PM

#

Okay, thanks for the examples, it makes sense. My proto is going to be lobby -> then start match and nobody can't join during the match, only in the lobby

thin stratus Apr 4, 2019, 3:06 PM

#

If you want to make it perfect

#

You might actually use two booleans

#

One that states if it's openeing or closing for example

#

And one for the state itself that is replicated only initially

#

Cause the Opening one sets it otherwise

meager spade Apr 4, 2019, 3:06 PM

#

so i always categorise RPC vs OnRep as, OnRep is current state, RPC is instantaneous

thin stratus Apr 4, 2019, 3:06 PM

#

There is like a thousand tricks you can do

jolly siren Apr 4, 2019, 3:07 PM

#

COND_InitialOnly

thin stratus Apr 4, 2019, 3:07 PM

#

Yop that's for the open state then

cinder quartz Apr 4, 2019, 3:07 PM

#

yeah, currently I'm doing one feature at the time, first testing server+client as one player, then testing with 2 players, then testing with dedicated server and make sure it works correctly on all

meager spade Apr 4, 2019, 3:07 PM

#

thats fine if you only want to do it the once, but if you use a single bool, that would be no good

#

like bChestOpened

cinder quartz Apr 4, 2019, 3:08 PM

#

i'm coming from Unity so I must say Unreal multiplayer feels 1000x better 😄

thin stratus Apr 4, 2019, 3:08 PM

#

To be fair

#

If you are in relevancy range

#

You will get the RPC to open the thing

#

Which lets you set the boolean yourself

#

If you aren't ,you will just get that boolean, initially, and that's it

#

That way you use one RPC and a oneTime OnRep

meager spade Apr 4, 2019, 3:09 PM

#

how about if the chest can be opened or closed like a door for example?

#

😄

thin stratus Apr 4, 2019, 3:09 PM

#

RPC handles that if you are in range

#

InitialOnRep if you come in range

#

Initial doesn't mean ONCE

#

It shouldn't at least

meager spade Apr 4, 2019, 3:09 PM

#

it means initial in that relevancy?

thin stratus Apr 4, 2019, 3:09 PM

#

It should call whenever the actor starts replicating for you

#

Yeah if you run away and come back it should call again

#

If not then well

cinder quartz Apr 4, 2019, 3:11 PM

#

one more question about shooting.. if I have automatic weapon with really high fire rate, I propably should do it with just two RPC's? StartFire and StopFire instead of calling RPC every shot ?

meager spade Apr 4, 2019, 3:11 PM

#

depends what you do with those RPC's

#

i never rpc start fire and stop fire

#

its done locally

cinder quartz Apr 4, 2019, 3:12 PM

#

just spawn some muzzle flashs and sounds on clients, server does tracing

meager spade Apr 4, 2019, 3:12 PM

#

and the hit results sent to the server for validation

#

and i kinda hacky use a OnRep notify for the muzzle flash

#

which is basically a uint8 which increases by 1 for every shot

cinder quartz Apr 4, 2019, 3:13 PM

#

actually right now the server does all shooting logic, but that sucks when playing with high ping because you can't hit anything you want

meager spade Apr 4, 2019, 3:13 PM

#

thats bad

cinder quartz Apr 4, 2019, 3:13 PM

#

yeah, so I think im going to just make client do the tracing and then check in server if its even possible and if it is, deal dmg

meager spade Apr 4, 2019, 3:14 PM

#

i have the server and client do the trace

cinder quartz Apr 4, 2019, 3:14 PM

#

but it's going to be co-op, not pvp game so I don't need super cheat proof solution I guess, atleast not for prototype

meager spade Apr 4, 2019, 3:14 PM

#

but you also still dont want people to have delayed shots

#

cause it will ruin the experience

thin stratus Apr 4, 2019, 3:14 PM

#

Iirc I use an int for that

#

If shooting, Int+1

#

If not int = 0

#

It's onRep

#

If int > 0 spawn effect

#

If = 0 stop

meager spade Apr 4, 2019, 3:15 PM

#

yeah i increase the uint8

#

for every shot

#

and reset it to 0 and end of fire

cinder quartz Apr 4, 2019, 3:15 PM

#

thats pretty cool

thin stratus Apr 4, 2019, 3:15 PM

#

Just make sure you skip from 255 to 1 ;)

ember needle Apr 4, 2019, 3:15 PM

#

what is the best way to get a PlayerArray OnRep event (GameState)

meager spade Apr 4, 2019, 3:16 PM

#

my guns dont fire more than 255 rounds

thin stratus Apr 4, 2019, 3:16 PM

#

Fair enough

#

BUT

meager spade Apr 4, 2019, 3:16 PM

#

minigun coolsdown at 200rounds lol

#

then that resets

thin stratus Apr 4, 2019, 3:16 PM

#

We all know what happened to Gandhi!

#

(referring to civilizations game)

meager spade Apr 4, 2019, 3:17 PM

#

int is 8 byte tho, uint 8 is 2 ?

thin stratus Apr 4, 2019, 3:18 PM

#

(They had Gandhi at Conflict Level 1, which was the lowest. Unlocking Diplomaty lowered the level by 2. They didn't check any min value. Tada, Gandhi sends atom missiles)

meager spade Apr 4, 2019, 3:21 PM

#

http://interkaos.com/grabs/devenv_2019-04-04_16-21-42.png

#

my bad uint8 is 1 byte, int is 4

north swan Apr 4, 2019, 3:23 PM

#

changing the dedicated server to use steam subsystem is a ton of work.
is there a less convoluted guide or info than
https://wiki.unrealengine.com/Dedicated_Server_Guide_Steam
?

Dedicated Server Guide Steam

#

I just want some barebones stuff

meager spade Apr 4, 2019, 3:23 PM

#

uworks is a good plugin

#

to help with steam intergration

#

it exposes everything you could need 😄

#

and its on sale right now.. so

north swan Apr 4, 2019, 3:24 PM

#

which one should I get? probably not singleplayer

📎 unknown.png

meager spade Apr 4, 2019, 3:25 PM

#

i got the full version

north swan Apr 4, 2019, 3:25 PM

#

is it the one on the right?

meager spade Apr 4, 2019, 3:26 PM

#

yeah the more expensive one, but it has everything MP, SP and Subsystem

ember needle Apr 4, 2019, 3:26 PM

#

but it states it does not integrate with steam

#

or maybe i got that wrong

meager spade Apr 4, 2019, 3:26 PM

#

it doesnt use the UE4 steam subsystem

ember needle Apr 4, 2019, 3:27 PM

#

oh ok

#

not the subsystem but still uses steam

#

"In 4.20.0, Epic has hard-coded their built-in subsystems, therefore making custom subsystems impossible to register without modifying the engine. You can read more about this issue over here. Until this is fixed, only the NetDriver, the Core/Web modules and the example project will work work out of the box."

meager spade Apr 4, 2019, 3:28 PM

#

thats been fixed

#

in 4.21.2

ember needle Apr 4, 2019, 3:29 PM

#

so this allows you to use steam, however with a custom solution (not the one in UE4). correct?

meager spade Apr 4, 2019, 3:29 PM

#

yeah i mean we use UWorks for our steam game

#

and advanced sessions

ember needle Apr 4, 2019, 3:29 PM

#

what are the advantages of this other advanced sessions plugin

meager spade Apr 4, 2019, 3:29 PM

#

we use both

ember needle Apr 4, 2019, 3:32 PM

#

ok so why did you get it...

meager spade Apr 4, 2019, 3:32 PM

#

because of all the functionality it allows without having to write it all ourselves

ember needle Apr 4, 2019, 3:35 PM

#

hence my question: what advantages? is this related to stats and so on?

fleet sluice Apr 4, 2019, 4:39 PM

#

Stats, achievements, lobbies, UGC, almost everything that Steam offers can be used directly either in BPs or in a UE4-specific C++ (i.e. delegates)

#

If you find a function in the Steam API reference ( https://partner.steamgames.com/doc/api ) it's most likely accessible through UWorks.

#

And you use the API alongside the Steam guides ( https://partner.steamgames.com/doc/features ) to achieve whatever it is you want to achieve with Steam.

#

UWorks functions and structs have the same names as their Steam SDK counterparts in order to make it easy to follow Steam's guides while using the plugin.

red ledge Apr 4, 2019, 7:07 PM

#

LogNet: Warning: Travel Failure: [LoadMapFailure]: Failed to load package '/Game/Maps/ThirdPersonExampleMap/UEDPIE_1_ThirdPersonExampleMap'
LogNet: Warning: TravelFailure: LoadMapFailure, Reason for Failure: 'Failed to load package '/Game/Maps/ThirdPersonExampleMap/UEDPIE_1_ThirdPersonExampleMap''. Shutting down PIE.
PIE: Warning: TravelFailure: LoadMapFailure, Reason for Failure: 'Failed to load package '/Game/Maps/ThirdPersonExampleMap/UEDPIE_1_ThirdPersonExampleMap''. Shutting down PIE.

#

I get that error when trying to connect to a PIE listen server through another a PIE window on another PC using ip

#

it works fine with a dedicated server or a standalone

#

does PIE not support 2 PIE instances on different computers connecting?

sterile pebble Apr 4, 2019, 7:21 PM

#

play in editor does not support that kind of stuff, as far as I know

red ledge Apr 4, 2019, 8:44 PM

#

gotcha, thanks!

grizzled stirrup Apr 4, 2019, 9:34 PM

#

Is it possible to have very relaxed movement component correction? (where the movement of another player isn't extremely important to the experience and buttery smooth clientside movement is more important than accuracy?)

#

I am using the launch character node and on 0 ping it works fine with the client but when the ping starts rising it jitters quite a bit

#

Takes away the satisfying smooth feeling

#

I'd just want the server's view of the client to interpolate to where the client actually is but the client himself never being corrected

#

So instead of the client saying "server please jump, while I jump locally and interpolate me to my location on the server" it would be "server I jumped, I'm here now, don't correct me but move your view of me to where I am"

jolly siren Apr 4, 2019, 9:46 PM

#

Is ShooterGame's ClientSideHitLeeway just a poor man's lag compensation?

#

Since they don't do server rewind or anything like that

grizzled stirrup Apr 4, 2019, 9:46 PM

#

Yes

#

It just checks within a bounding box range

#

And allows it if so

jolly siren Apr 4, 2019, 9:46 PM

#

So instead of rewinding they just give a really big leeway to hope that covers the latency?

grizzled stirrup Apr 4, 2019, 9:47 PM

#

Yes

#

So within like 150 ms the server will probably hit within the box

jolly siren Apr 4, 2019, 9:47 PM

#

Okay cool, just wanted to make sure I was sane reading through this 😃

grizzled stirrup Apr 4, 2019, 9:47 PM

#

😄

jolly siren Apr 4, 2019, 9:50 PM

#

Thank you for confirming

#

That is a good question kyle

#

There is a ClientAuthorativePosition on CMC. That might be a good place to start

#

You could try flipping that on to true while doing the launch and see where that gets you

grizzled stirrup Apr 4, 2019, 9:54 PM

#

Thank you very much, I'll give that a shot

jolly siren Apr 4, 2019, 9:55 PM

#

There is also bMovementTimeDiscrepancyForceCorrectionsDuringResolution

#

big name lol

#

    /** 
     * Whether client moves should be force corrected during time discrepancy resolution, useful for projects that have lenient 
     * move error tolerance/ClientAuthorativePosition enabled.
     */
    UPROPERTY(GlobalConfig)
    bool bMovementTimeDiscrepancyForceCorrectionsDuringResolution;

#

Please let me know if you solve it, because I'm interested in the answer as well

grizzled stirrup Apr 4, 2019, 9:56 PM

#

Amazing thank you very much, will try that out now

meager spade Apr 4, 2019, 10:10 PM

#

@jolly siren i wonder if there is that much difference between leeway and rewind used in UT5

#

UT4*

jolly siren Apr 4, 2019, 10:11 PM

#

I would also love to see a comparison of the results

#

Leeway is obviously much easier to implement. But I assume rewind gives much better and controllable results, and also protects against cheating better.

meager spade Apr 4, 2019, 10:12 PM

#

yeah im still on the fence about how to handle prediction

#

tbh i am also kinda trying to work out how to reduce RPC calls during weapon fire

#

but im struggling to come up with a kinda batch RPC system

#

where a fast firing gun will batch the rpcs during frames, and then send them in one go

jolly siren Apr 4, 2019, 10:15 PM

#

What are you rpcing?

#

You said earlier that you don't rpc start/stop. So are you talking about hit/miss events?

grizzled stirrup Apr 4, 2019, 10:22 PM

#

@jolly siren maybe this is crazy (just thinking of any other options before making a custom edit to the CMC), but since the other player's accurate position REALLY doesn't matter (just needs to be generally in the right position and playing the right FX when shooting / playing the correct anim)- could I maybe just literally tell the server to update its location of the client at a fixed rate (like send and set a vector 10 times a second) and lerp between the current update to the next?

#

Then replicate all other stuff like gunshots and such from the client as usual?

grand kestrel Apr 4, 2019, 10:24 PM

#

Isn't that basically what Fortnite does for simulated proxies that are far away 😐

grizzled stirrup Apr 4, 2019, 10:24 PM

#

No clue but maybe it could work for buttery smooth client movement?

#

Disable movement replication and just update manually

#

Worth a try

grand kestrel Apr 4, 2019, 10:24 PM

#

That isn't what its for

#

It would be to avoid the computationally expensive simulated movement

grizzled stirrup Apr 4, 2019, 10:25 PM

#

Yeah for sure but in this case maybe it can work to get the smooth client gameplay I'm looking for?

grand kestrel Apr 4, 2019, 10:25 PM

#

Its only used for players that are too far away to really interact with

grizzled stirrup Apr 4, 2019, 10:25 PM

#

Yep but in Fortnite the position of the players is extremely important

#

So the server has to correct them up close

#

In my game the client should go wherever and the server just needs to visually see where he is generally

grand kestrel Apr 4, 2019, 10:26 PM

#

Also you should probably use replication not rpc

#

For this

grizzled stirrup Apr 4, 2019, 10:26 PM

#

How can I replicate from the client to the server?

grand kestrel Apr 4, 2019, 10:26 PM

#

Just in case it wasn't obvious

#

You can't

#

Why would you 😐

grizzled stirrup Apr 4, 2019, 10:26 PM

#

That's what I'm trying to do

grand kestrel Apr 4, 2019, 10:27 PM

#

Then you do need an RPC but this doesn't sound like something appropriate

grizzled stirrup Apr 4, 2019, 10:27 PM

#

I just need the server (listen server host) to get a general approximation of where the other client is while giving the other client authoritive (and therefore super smooth) movement

#

To avoid any corrections since they don't need to be corrected

#

The players are playing together against AI

#

So there's no need for their positions to be extremely accurate

#

But there is a need for clients to have smooth and satisfying movement that is often corrected under default replicated movement at pings greater than 100ms

grand kestrel Apr 4, 2019, 10:28 PM

#

So basically you want client authoritative movement

grizzled stirrup Apr 4, 2019, 10:28 PM

#

Yes

#

And have the server just see where the client is

#

Replicate everything else normally (gunshots, FX, anim state)

grand kestrel Apr 4, 2019, 10:29 PM

#

OK so turn off replicate movement. Have players send a server RPC. Server stores that as replicated with COND_SkipOwner, and OnRep updates simulated clients

#

It will send a struct containing location, rotation, anything else you need

#

That struct replicates

#

Etc

grizzled stirrup Apr 4, 2019, 10:30 PM

#

Is there a need for the struct to replicate or can I just have the client call a server RPC that sends the struct that would then (within the RPC call) update the position of the client from the perspective of the server?

#

Oh of course it has to replicate to other clients

#

duh

#

So the struct is a Repnotify variable, it skips the owning client and via the OnRep function updates the position of the owning client to other clients and the server

#

I wonder if I limit my game to 2 players (which is the intended experience anyway), could I get away with not even having to replicate that struct and explicitly just call a single server RPC to update the other player's position on the server?

fossil spoke Apr 4, 2019, 10:35 PM

#

Your better off using a Replicated variable.

grizzled stirrup Apr 4, 2019, 10:36 PM

#

Even in the case of 2 players listen server?

fossil spoke Apr 4, 2019, 10:36 PM

#

Always favor replication over RPCs

grizzled stirrup Apr 4, 2019, 10:36 PM

#

I'd still have to call the rpc for the client to send his location (client authority over movement)

#

Thank you both very much for responding btw

fossil spoke Apr 4, 2019, 10:37 PM

#

Sure

grizzled stirrup Apr 4, 2019, 10:37 PM

#

So in the case of client sending his movement via rpc, I'm not sure how replication even fits in?

#

Since the client can't replicate to the server

#

And the server doesn't need to replicate the data back to the client

#

He just needs to update the position of the client on his screen

fossil spoke Apr 4, 2019, 10:40 PM

#

Replication is being used when the Server needs to tell the other Clients what happened, thats all.

grizzled stirrup Apr 4, 2019, 10:41 PM

#

Sure, but in this case, I just want the client to say "Hey server, I'm here, update me on your screen"

#

But he has full authority over his movement (no corrections from the server)

#

So I assume it'd be best to just send a single RPC with a struct that contains location / rotation once every second and interpolate?

fossil spoke Apr 4, 2019, 10:42 PM

#

"Update me on your Screen" is what the Server is doing when you do the RPC

#

Replication is updating the movement on other players screens

grizzled stirrup Apr 4, 2019, 10:42 PM

#

Yep, but in the case of 2 players on a listen server (one being the server), this wouldn't be necessary, correct?

#

Sorry for being difficult haha just trying to get a better understanding

fossil spoke Apr 4, 2019, 10:43 PM

#

Ah right, yes on a Listen Server correct. You would skip the RPC part for the Listen Server Client

#

However its still relevant for connected Clients

grizzled stirrup Apr 4, 2019, 10:43 PM

#

You'd skip the replication rather? The RPC would be the necessary way for the client to tell the server where he is, right?

#

And yes definitely relevant for more than 1 client

fossil spoke Apr 4, 2019, 10:44 PM

#

1 of the Clients is the Server so he doesnt need to RPC his own movements to himself.

#

He does need to Replicate the movement to other Players though.

grizzled stirrup Apr 4, 2019, 10:44 PM

#

Oh sorry got confused by "Listen Server Client"

#

So that'd be the host (server)

fossil spoke Apr 4, 2019, 10:44 PM

#

Yes

grizzled stirrup Apr 4, 2019, 10:45 PM

#

Ok yep perfect

fossil spoke Apr 4, 2019, 10:45 PM

#

The Host can skip doing an RPC because really thats not going to do anything anyway.

grizzled stirrup Apr 4, 2019, 10:45 PM

#

So he'd have to replicate his movement down to the client (either the default way or else the same way as the client is doing it, just not an rpc)

#

In that case I could probably just set bReplicatesMovement to true for the server and false for the client

#

So the client sees the server, the server gets updates on where the client is and can see him

#

Everyone is happy

grizzled stirrup Apr 4, 2019, 11:27 PM

#

Is there any reason that when I uncheck replicate movement only on the client of a listen server and not the server (host), no movement is replicated in either direction?

📎 Capture.PNG

#

When both are checked, I see movement replication of both client and server

#

I just want to see the server's position replicated down to the client but not the other way around

rotund sapphire Apr 4, 2019, 11:45 PM

#

My question is, when you step over the relevancy distance, then after a couple seconds move back, it may happens the replicated actor's components become pending kill, and won't gets recreated again - they actually will be missing. Have anybody noticed such issues with replication before? 4.20 PIE

main sentinel Apr 5, 2019, 12:12 AM

#

How do I set these macros on .Tartget.cs file? Do I also need to set them on Server.Target.cs as well?

📎 unknown.png

grizzled stirrup Apr 5, 2019, 12:31 AM

#

I'm completely stumped by my screenshot- is it really not possible to have a client not replicate movement but the server replicate down to him? I feel like there's something extremely basic I'm missing

main sentinel Apr 5, 2019, 12:33 AM

#

if you want clients to replicate movement to other clients directly, you can't do that using unreal networking. I believe you'd have to use another networking layer which is not really recommended

rotund sapphire Apr 5, 2019, 12:33 AM

#

Client does not replicate movement to server, unless you are thinking about the Character Movement Component which is a different case.

grizzled stirrup Apr 5, 2019, 12:34 AM

#

It's a 2 player game so I just want the host player (server) to replicate movement normally down to the second player (client) , but I want the client to not replicate movement at all and instead send the server updates

#

I have the client sending updates perfectly but whenever I tell authority (host) to replicate movement and the client player (remote) to not replicate, I don't see any movement from the host

#

It would make sense to me that if I'm the client and the server is replicating movement, I'd see him move?

#

And yes it's the character movement component

#

But I'm setting Replicate Movement on the actor

#

Not on the CMC

rotund sapphire Apr 5, 2019, 12:38 AM

#

I think you can individually adjust the CMC replication props. The actor's replicate movement would be a setting to sync from server to client the transform of the actor. I'm surprised that it would severe the movement of the character but maybe it does.

grizzled stirrup Apr 5, 2019, 12:38 AM

#

Ok thanks I'll try that

#

Setting any combination of replicate movement to false only on the client but not on the server either results in the client still getting corrected or the server being motionless

#

I really thought it'd be as simple as saying "Server - yes, Client - no"

rotund sapphire Apr 5, 2019, 12:47 AM

#

When you enable the replicate movement on the actor, but disable the replication of the CMC what exactly is the outcome of that?

grizzled stirrup Apr 5, 2019, 1:06 AM

#

@rotund sapphire there's no change- the movement is replicating and the client gets corrected

#

The CMC has a "component replicates" flag of false by default though

#

So I'm assuming the actor "Set Replicate Movement" is what actually causes the CMC replication

#

Also in the case of interpolating the positions of multiple remote clients on tick for smooth movement, how can you do it so that you are interpolating client X to this value but client Y to another?

#

The on rep would set the target location but I'm not sure how to then smoothly interpolate multiple different simulated proxies

#

I guess you'd have to store an array of other players and set their positions individually on tick....

rotund sapphire Apr 5, 2019, 1:12 AM

#

You can maybe try it this way, sometime after begin play. It's possible that Character class will enable this internally, but you should be able to disable it.

📎 cmcrep.png

grizzled stirrup Apr 5, 2019, 1:12 AM

#

Yep that's what I was disabling- no change

#

If you see it's actually false already

rotund sapphire Apr 5, 2019, 1:12 AM

#

But it also possible that Character class takes care of the synchronization of CMC which could be an unfortunate case for you

grizzled stirrup Apr 5, 2019, 1:12 AM

#

So it would be either all on or off for a certain actor?

rotund sapphire Apr 5, 2019, 1:13 AM

#

Character is a different case from Actors, it's a super complicated piece of code.

grizzled stirrup Apr 5, 2019, 1:13 AM

#

Thanks for your help, I'll try to find an easier alternative

rotund sapphire Apr 5, 2019, 1:13 AM

#

You can maybe try to use Pawns, that is less cluttered. And it doesnt replicate stuff, that's a good start for you.

grizzled stirrup Apr 5, 2019, 1:14 AM

#

Thanks, might have to move back to pawn and implement a basic movement system

rotund sapphire Apr 5, 2019, 1:16 AM

#

The on rep would set the target location but I'm not sure how to then smoothly interpolate multiple different simulated proxies
Either it's a server or client you want to interpolate, you can use the Tick() and simply lerp'ing the transform between current loc and target loc, on a rate of your choosing that is in sync with the timing of the replicated information.

#

For instance, if the transform is being replicated once in a second, then you can simply use the tick delta for the lerp alpha, and it will arrive at target loc at the moment the new information arrives, so it can continue move on his path. It will be a second late of course, but that may not be an issue for you. Or is it?

#

If you wish to keep them in very strict sync with server locations, then you have to think about movement predictions (extrapolated from ping/updaterate/velocity etc information)

gusty lily Apr 5, 2019, 1:26 AM

#

hey, when i test 2 players in editor, not dedicated server, both are using the same player controller (same name, not an iteration of the same name). shouldnt they be different? wondering if this has to do with my spawning weirdness.

rotund sapphire Apr 5, 2019, 1:28 AM

#

A playercontroller can only posses one pawn at a time, so i think you got confused on something else.

gusty lily Apr 5, 2019, 1:32 AM

#

makes sense. but as per this screenie, printing the player controller name of both active windows gives the same name

📎 unknown.png

#

that is the result of:

📎 unknown.png

grizzled stirrup Apr 5, 2019, 1:34 AM

#

@rotund sapphire Thank you for the detailed response! I'm a bit rusty on netcode in general but how do I know which client I'm lerping on tick if there's only one current loc and target loc var on the character? I have it lerping fine when I am interpolating a specific actor but for more than one I'm lost

#

I know that each client has a copy of each other client's properties, but I'm confused on how to nicely interpolate all other clients

#

I definitely don't need a strict sync

#

Just need all clients and the server to be generally where they are on their local screens

rotund sapphire Apr 5, 2019, 1:36 AM

#

kylekatarn, all clients have their own copies of the pawns running individually, and so the logic you implement on tick will interpolate there individually as well. They are called Remote Proxies btw.

grizzled stirrup Apr 5, 2019, 1:37 AM

#

So on tick if I do a branch to check if their local role == ROLE simulated proxy and then do the interp stuff, it'll do it for ALL other clients with their individual locs?

#

I assume the target loc and rot need to be repnotify vars?

rotund sapphire Apr 5, 2019, 1:38 AM

#

the_hack, you can perhaps try print out object name, maybe is has the instance flags in the name too. But don't worry they are individual PC's i can tell you already that much.

gusty lily Apr 5, 2019, 1:40 AM

#

yeah im printing the pc name it is unique for both

#

ok will try that thanks

rotund sapphire Apr 5, 2019, 1:40 AM

#

Yes kylekatam i think that should work. But you don't have to create a system here that will iterate all clients. Like i said these remote proxy pawns will run their own ticks, so all you have to do here is just rep the loc and rot, and just let them fly on their own.

grizzled stirrup Apr 5, 2019, 1:40 AM

#

Ok that's awesome thank you very much

gusty lily Apr 5, 2019, 1:41 AM

#

object name is the same too.

#

..._C_0 for both

rotund sapphire Apr 5, 2019, 1:43 AM

#

Maybe because playercontroller(0) is the PC of the client, so it will be _0 on client side always. You can perhaps access some different information, such as the player index from the playerstate that should be different.

gusty lily Apr 5, 2019, 1:46 AM

#

ah ok. thanks. i'm trying to work out why the focus/control switches from the server player to the client player window when the server frags the client. this is helping even if its not the reason

rotund sapphire Apr 5, 2019, 1:48 AM

#

Testing in PIE comes with some mess in window and focuses, but you can maybe run your game in standalone mode. Does that makes any difference in this issue?

grizzled stirrup Apr 5, 2019, 1:51 AM

#

Sorry Robert, one more thing- what would you put in the OnRep function in my case? Setting the target location variable even though the onrep struct with location could be directly plugged in to the interpolate?

rotund sapphire Apr 5, 2019, 1:53 AM

#

I don't think you actually have to use onrep at all. You just replicate the value, and run the tick all the time to interpolate the pawn to whatever the replciated loc/rot have at that moment. By using the delta for the lerping it can run continously. It should be easy to setup this way.

grizzled stirrup Apr 5, 2019, 1:53 AM

#

Perfect thanks a lot!

#

I have the server replicating nicely down to the client now by checking if local role == simulated proxy but finding it hard to have both server replicating to client and vice verca- might just be a combination of role checks

rotund sapphire Apr 5, 2019, 1:55 AM

#

Yeah i have a bit of a hard time comprehend what exactly you are willing to do here. But i just hope in the end your idea works out for you. :P

grizzled stirrup Apr 5, 2019, 1:55 AM

#

No problem thanks a lot for the help!

rotund sapphire Apr 5, 2019, 1:57 AM

#

So why do you want client to move on it's own freely, but also the same time receive updates from server as well?

#

Or you want to send the information to server? But then what do you wish to replicate from server to client?

grizzled stirrup Apr 5, 2019, 1:57 AM

#

I want the client to have authorative movement for ultimate smooth gameplay but I want to still see the position of the server

#

I tried disabling movement replication only on the client but it didn't work

#

So now I'm trying to manually send the data

#

And interpolate

rotund sapphire Apr 5, 2019, 1:58 AM

#

Replication only works from server to client. You have to use RPC to send the location info to the server.

grizzled stirrup Apr 5, 2019, 1:58 AM

#

Yeah it's working great with an RPC but the server doesn't move on the client

#

So now I have the server moving on the client but the client not moving on the server haha

#

I had both working at different stages but never both together (the server sees where the client is roughly, and the client sees where the server is roughly)

#

Doesn't need to be accurate they just both have to be sending updates to each other at some rate

#

Ohhhh I got it!

#

On tick check if the remote role == ROLE Autonomous Proxy (Client movement on server) OR if the local role == ROLE simulated proxy (server movement on client)

#

That's the winning combo 😄

#

Every second the server either sets his replicated loc and rot struct or the client does an rpc that sets that struct

rotund sapphire Apr 5, 2019, 2:03 AM

#

But at some point, som of these guys have to decide who is the authoritive here.

#

Because, once you introduce a bit of network latency to this equation you will see them twitching dancing around.

grizzled stirrup Apr 5, 2019, 2:03 AM

#

It's 200ms atm

#

There's no correction so and the server is still the authority

#

He just doesn't care about the client movement

#

He just needs to know roughly where it is

rotund sapphire Apr 5, 2019, 2:04 AM

#

I usually roll with this tool, never cheats on me. https://jagt.github.io/clumsy/

grizzled stirrup Apr 5, 2019, 2:04 AM

#

Oh really cool!

#

I'll check it out

#

Usually net pktlag = x works great though in PIE

rotund sapphire Apr 5, 2019, 2:04 AM

#

Ah i see what you mean. So the server won't apply the movement data, but receives it for stats only.

#

That's alright i guess

grizzled stirrup Apr 5, 2019, 2:05 AM

#

Yeah it's a giant hack really but I just want it for a game where you play together with a friend and the movement should feel great

#

Not rubberbanding and being corrected

#

Is it terrible practice to be setting the mesh positions on tick and sending a rot and location a few times a second, or is it quite ok seeing the circumstances?

rotund sapphire Apr 5, 2019, 2:05 AM

#

Rubberbanding and network latency are comes hand in hand. In my experiences.

grizzled stirrup Apr 5, 2019, 2:05 AM

#

Yep

#

And it never feels good

rotund sapphire Apr 5, 2019, 2:07 AM

#

Well. At the rate you send the updates, plus the time it require to arrive at location, the client will be a bit of a desync / late. In your case it would be 200msec + replication tick rate msec latency. So that could be an issue in certain gameplays.

#

But updating the mesh location on tick rate should be fine.

grizzled stirrup Apr 5, 2019, 2:08 AM

#

Keep in mind in this game you just fight AI with your friend so as long as he feels you are nearby and sees generally where you are, no one would be any the wiser

#

And great, that's awesome to hear

#

All other movement replication is turned off too so probably saving something there

#

Proxies are all smoke and mirrors anyway I guess

#

I'll then just run RPCs for important events like shooting or impact FX

#

And it'll feel like he is there but the client will have buttery smooth movement

rotund sapphire Apr 5, 2019, 2:10 AM

#

Character Movement Comp also takes care of packet loss and such issues, helping with synchronizing the characters and events etc. This may be a missing part, but not neccessarly required for you as i understand.

grizzled stirrup Apr 5, 2019, 2:10 AM

#

Yeah CMC is great for games where accuracy matters like PvP shooters

#

But I imagine even if you dropped packets, with my tick system it'll just interpolate when it can

rotund sapphire Apr 5, 2019, 2:10 AM

#

And melee fight too.

grizzled stirrup Apr 5, 2019, 2:10 AM

#

If it doesn't get an update it'll just stop moving

#

Yeah!

rotund sapphire Apr 5, 2019, 2:11 AM

#

Yes the tick will help the character to arrive. But it will be moving a bit faster than usual. From the perspective of the other player.

#

Like for instance, the CMC does something like, when there is no update of location, and no update in movement changes, it will allow the character to run forward, until it receives a new data to do something else. Like stopping.

#

CMC is efficient because only send updates when required.

grizzled stirrup Apr 5, 2019, 2:13 AM

#

Ah yeah that is very nice

#

Very efficient

#

It still probably updates something on tick right?

#

Like the location / rotation, even if it's using old data

#

Probably in a more clever and optimized way

#

However since there'll be max 4 players in my game I think it'll be ok my way unless I am missing something

#

4 sets of location and rotation vectors 10 times a second seems reasonable

rotund sapphire Apr 5, 2019, 2:15 AM

#

That's ok indeed.

#

CMC is much more efficient tho :)

grizzled stirrup Apr 5, 2019, 2:16 AM

#

If only I could tell it to not correct the client 😄

#

Then I'd be able to use it

#

Just let the client do whatever but tell the others where he is

#

One thing I'm noticing with my setup is that when the client sees the server moving it's buttery smooth (interpolation), but when the server sees the client moving it's quite choppy

#

Not sure why this is (almost like the proxy has a lower tick rate)

#

It's not extreme choppiness but about 1/6th the frames

fleet raven Apr 5, 2019, 2:18 AM

#

for the default character movement, this happens because the server only simulates the player when it receives inputs

rotund sapphire Apr 5, 2019, 2:22 AM

#

There are some settings for the CMC interpolations, but it is indeed going to be bit choppy here and there when the ping is fluctuating. Which is it does in real case.

grizzled stirrup Apr 5, 2019, 2:23 AM

#

Thanks again for the amazing help

#

One LAST question- if I wanted to continue the client authority trend for things like animation bools- should I be sending server RPCs with a bool such as "jumping" that is replicated but with the skip owner condition?

#

So that the client will always be the one that sets it but it'll update on the server / other clients correctly

rotund sapphire Apr 5, 2019, 2:26 AM

#

I'm not sure whether the replication conditions work properly in blueprints. Maybe they fixed it in 4.21+.

grizzled stirrup Apr 5, 2019, 2:26 AM

#

yeah I see the skip owner condition is broken in issues 😦

#

Would this be the correct approach though?

#

I can move it to C++ if needed

rotund sapphire Apr 5, 2019, 2:28 AM

#

Yes that's sounds right. You can maybe replicate the bool as a variable with a notify, and apply the jumping when the bool changes. But it will only replicate when the bool is changed.

#

You can also move the thing in c++ indeed, or just check on the event whether the modification arrived back to owner, and skip manually. In blueprints at least. That's maybe works better with multicast rpcs to avoid conflict with the bool value.

grizzled stirrup Apr 5, 2019, 2:30 AM

#

Great thank you, will experiment with it

#

Lots to understand and learn 😃

winged badger Apr 5, 2019, 5:35 AM

#

@grizzled stirrup RepNotify in BP acts more like a setter then a replication callback, if you set a RepNotify variable locally on a client, its RepNotify will fire

#

c++ does not have the same issue

solid echo Apr 5, 2019, 6:49 AM

#

Well you shouldn't be setting it locally if it's replicated...

#

lol

gusty lily Apr 5, 2019, 6:50 AM

#

regarding my issue above, in a networked (steam) game, client and server players have the same player controller names (ending in _C_0 ) 😮

solid echo Apr 5, 2019, 6:51 AM

#

C_0 is just the local name.

#

the GUID will be different

gusty lily Apr 5, 2019, 6:56 AM

#

ah. thanks.

scenic raven Apr 5, 2019, 10:26 AM

#

I have a bug that happens often, but not 100% of the time. I have two player start actors in my map, and two players. around 50% of the time I start my game, both players try to spawn on the same player start actor, with the funny effect of jumping on top of each other's head. Anyone ever saw something like this or has any clue?

chrome bay Apr 5, 2019, 10:27 AM

#

Yeah happens to me all the time. In theory it shouldn't happen but it seems the engines native code for choosing a player start doesn't check collision properly.

#

I just built my own system where each player "reserves" a player start, then it can't be used by others

scenic raven Apr 5, 2019, 10:28 AM

#

oh ok

#

I have to go and override the chooseplayerstart then

#

too bad 😭

#

I'm reading the code

#

I guess it's a problem that happens from concurrency

#

when there's zero latency

#

between clients and server

chrome bay Apr 5, 2019, 10:38 AM

#

Well in theory what should happen is one player is spawned at one player start, then when it's the next players' turn that one is occupied by a colliding actor so it shouldn't consider it - but for whatever reason that doesn't always happen

#

Been a while since I've looked at that code though

ivory portal Apr 5, 2019, 11:37 AM

#

I have a couple of buttons, when a player presses the correct one it turns green. These buttons are server-owned. How can I make the button only green for the clicking client?

#

So that the other clients can't see the button turning green?

chrome bay Apr 5, 2019, 12:23 PM

#

pointer to the playerstate/PC which should see it as green is my first guess

#

Or a bitmask of some kind if you want multiple players to see it as green

thin stratus Apr 5, 2019, 12:33 PM

#

How does one get the ViewLocation of a Client again?

#

Got a CameraActor that is spawned locally and set as ViewTarget.
Server obviously doesn't have that and struggles to perform linetraces based on the camera of the client.

jolly siren Apr 5, 2019, 12:38 PM

#

Is it managed by the camera manager? Or an entirely separate camera than the players?

thin stratus Apr 5, 2019, 12:40 PM

#

Entirely different camera

#

I could move all of the camera logic into the manager

#

But hm

#

The ControlRotation exists on the Server, so that is already okay

#

But the location offset from PC/Pawn to the ViewTarget is missing

#

The Camera is also driven my user settings for distance to pawn and and height offset.
Even if I do the math on the server too, it would be missing the differently set variables

#

Isn't there some replicated vector somewhere that can be used already?

grizzled stirrup Apr 5, 2019, 12:48 PM

#

Does switch have autority fire both the authority and remote outputs for a host of a listen server? (hosting but also playing)?

#

Might explain why I couldn't enable movement replication only for the listen server host and not other clients

thin stratus Apr 5, 2019, 12:48 PM

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No

#

Only Authority

grizzled stirrup Apr 5, 2019, 12:49 PM

#

Hmm I'm so confused as to why it doesn't seem to work (setting server to replicate movement to the client, but the client NOT to be corrected / have movement replication ticked)

#

Just using switch has autority as a branch on begin play

jolly siren Apr 5, 2019, 12:49 PM

#

PlayerController's send a ServerUpdateCamera rpc every tick by default, which sends the client camera location and the camera pitch and yaw to the server. But I'm not sure about non player based cameras.

thin stratus Apr 5, 2019, 12:50 PM

#

I'll see if I can hijack that, thanks!

jolly siren Apr 5, 2019, 12:50 PM

#

no problem 😃

thin stratus Apr 5, 2019, 12:50 PM

#

Where is that called though hehe

#

Ah found it

jolly siren Apr 5, 2019, 12:51 PM

#

APlayerCameraManager::UpdateCamera

grizzled stirrup Apr 5, 2019, 12:52 PM

#

I guess with the issues regarding replication conditions in BP and the repnotify issue someone mentioned above, I should use C++ for at least the networking setup?

#

It seems the conditions work in PIE but not in packaged games

#

Bit of a shame as BP is great but it is what it is

thin stratus Apr 5, 2019, 12:53 PM

#

@jolly siren This is tight into the CharacterMovementComponent

#

You gotta hate the CMC one way or another

jolly siren Apr 5, 2019, 12:54 PM

#

Yeah a lot of things are coupled to it

#

It's a Frankenstein

thin stratus Apr 5, 2019, 12:54 PM

#

Yeah I'm missing that line

#

Will add it now

jolly siren Apr 5, 2019, 1:00 PM

#

float AUTPlayerController::GetPredictionTime()
{
    // exact ping is in msec, divide by 1000 to get time in seconds
    //if (Role == ROLE_Authority) { UE_LOG(UT, Warning, TEXT("Server ExactPing %f"), PlayerState->ExactPing); }
    return (PlayerState && (GetNetMode() != NM_Standalone)) ? (0.0005f*FMath::Clamp(PlayerState->ExactPing - PredictionFudgeFactor, 0.f, MaxPredictionPing)) : 0.f;
}

lol okay UT you aren't dividing by 1000

#

magic

thin stratus Apr 5, 2019, 1:03 PM

#

o.o

jolly siren Apr 5, 2019, 1:06 PM

#

Do you use ootb ExactPing for your prediction calculations or do you roll out your own ping system like UT's ServerBouncePing, ClientReturnPing, ServerUpdatePing, etc?

#

I guess ExactPing is really an average across 4 seconds

thin stratus Apr 5, 2019, 1:07 PM

#

I use the same stuff the CMC uses atm

jolly siren Apr 5, 2019, 1:07 PM

#

So it doesn't change quickly enough

#

For server rewind prediction stuff? Like bullet fire?

#

void APlayerState::UpdatePing(float InPing)
{
    // Limit the size of the ping, to avoid overflowing PingBucket values
    InPing = FMath::Min(1.1f, InPing);

    float CurTime = GetWorld()->RealTimeSeconds;

    if ((CurTime - CurPingBucketTimestamp) >= 1.f)
    {
        // Trigger ping recalculation now, while all buckets are 'full'
        //    (misses the latest ping update, but averages a full 4 seconds data)
        RecalculateAvgPing();

        CurPingBucket = (CurPingBucket + 1) % ARRAY_COUNT(PingBucket);
        CurPingBucketTimestamp = CurTime;


        PingBucket[CurPingBucket].PingSum = FMath::FloorToInt(InPing * 1000.f);
        PingBucket[CurPingBucket].PingCount = 1;
    }
    // Limit the number of pings we accept per-bucket, to avoid overflowing PingBucket values
    else if (PingBucket[CurPingBucket].PingCount < 7)
    {
        PingBucket[CurPingBucket].PingSum += FMath::FloorToInt(InPing * 1000.f);
        PingBucket[CurPingBucket].PingCount++;
    }
}

#

This is what the engine does for ping calculation

thin stratus Apr 5, 2019, 1:11 PM

#

Currently only the pawn itself is predicted. Haven't done anything about rewinding bullets yet

jolly siren Apr 5, 2019, 1:11 PM

#

It looks like UT wanted ping values that updated more quickly for prediciton

thin stratus Apr 5, 2019, 1:11 PM

#

Wouldn't really know where to start there anyway

jolly siren Apr 5, 2019, 1:11 PM

#

Ahh okay gotcha, saw that you were talking about the same GetPredictionTime magic numbers with Moss a couple years back in the chat history

thin stratus Apr 5, 2019, 1:11 PM

#

(camera bug is solved now, thanks!)

#

Yeah Moss might know more

#

Or TheJamsh

#

I only scratched that stuff

jolly siren Apr 5, 2019, 1:12 PM

#

Did ServerUpdateCamera help?

#

With your issue

thin stratus Apr 5, 2019, 1:12 PM

#

Yeah I was missing this:

    APlayerController* PC = Cast<APlayerController>(HoverdroneOwner->GetController());
    APlayerCameraManager* PlayerCameraManager = (PC ? PC->PlayerCameraManager : NULL);
    if (PlayerCameraManager != NULL && PlayerCameraManager->bUseClientSideCameraUpdates)
    {
        PlayerCameraManager->bShouldSendClientSideCameraUpdate = true;
    }

#

In my MovementComponent

#

Right after ServerMove

jolly siren Apr 5, 2019, 1:13 PM

#

ahh awesome 😃

#

Glad you got it working

thin stratus Apr 5, 2019, 1:14 PM

#

Yeah thanks, would have never found that without the ServerUpdateCamera tip

jolly siren Apr 5, 2019, 2:00 PM

#

@chrome bay Any chance I could sneak a peek at your GetPredictionTime? 😇
UT's has a bit of magic numbers going on. I'm wondering if you have dived into prediction for things like weapon fire much.

grizzled stirrup Apr 5, 2019, 2:03 PM

#

UT Prediction / compensation code 😄

#

It's crazy

#

Tried to implement something similar a while back but it's so tricky

jolly siren Apr 5, 2019, 2:05 PM

#

The saved position bits are all pretty simple. Their prediction time though is a bit wonky. They have their own latency rpc system for tracking more accurate ExactPing. And then GetPredictionTime itself is a bit iffy. I'm tweaking values now to see what works best here.

#

float AUTPlayerController::GetPredictionTime()
{
    // exact ping is in msec, divide by 1000 to get time in seconds
    //if (Role == ROLE_Authority) { UE_LOG(UT, Warning, TEXT("Server ExactPing %f"), PlayerState->ExactPing); }
    return (PlayerState && (GetNetMode() != NM_Standalone)) ? (0.0005f*FMath::Clamp(PlayerState->ExactPing - PredictionFudgeFactor, 0.f, MaxPredictionPing)) : 0.f;
}

I don't know how they determined what PredictionFudgeFactor should be. Or .0005

chrome bay Apr 5, 2019, 2:21 PM

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yeah mine is the same but I've got rid of the fudge factor, I think that's there just to get around server-side processing time

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But.. so far it seems close enough

#

i've split off from what UT's doing a fair bit though

jolly siren Apr 5, 2019, 2:27 PM

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ahh okay that makes sense. I'm actually not including server side processing time in my ping via PingExcludeFrameTime. So that would explain why I see better results without the fudge factor

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❤

chrome bay Apr 5, 2019, 2:28 PM

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Yeah I tried to ask about it but never got a reply 😢

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That's all I can think of is processing time

jolly siren Apr 5, 2019, 2:28 PM

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I am also experimenting with .001 instead of .0005 as the magic sauce lol

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Since the comment says they are dividing by 1000

#

Where did you ask at? udn?

#

But yeah that makes since that the fudge factor would be the server side processing time

chrome bay Apr 5, 2019, 2:29 PM

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nah I tried to harrass pete on twitter but he's gone quiet since FN BR 😄

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but yeah ping is in ms so divide by 1,000 to get it in seconds for delta time

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or mult even..

jolly siren Apr 5, 2019, 2:31 PM

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Makes sense, yeah I don't know why they divide by 2,000

chrome bay Apr 5, 2019, 2:31 PM

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half ping time 😄

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ping = RTT

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for some bits you only want half of it

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e.g. from serv->client

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It is a bloody minefield though

jolly siren Apr 5, 2019, 2:32 PM

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ahhhh

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Yeah that makes sense now

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I'll try with .0005 then and without the fudge factor since I'm not including processing time in ping

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Thanks for the help James

chrome bay Apr 5, 2019, 2:33 PM

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nps!

jolly siren Apr 5, 2019, 2:39 PM

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It seems like there should be a better solution for getting client's ping on the server without having all these rpcs like UT does.
ServerBouncePing, ClientReturnPing, ServerUpdatePing, etc

humble comet Apr 5, 2019, 3:16 PM

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Good time of a day ue4 multiplayer connoisseurs. I have a pretty bad performance playing multiplayer on android. Main issue are lags whenever my characters are moving across the scene and whenever launch character is executed from server(game is heavily based on launching and throwing characters around). Characters use standard ue4 char move component. I've gathered netprofile datas from devices but didnt get much information from there. Outgoing bw is averaging at 1.5kb/s across various devices. I have very little amount of replicated variables and only 4-6 players. Also there are no other replicated actors in the map. What should I consider in order to get smooth gameplay.

📎 unknown.png

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📎 unknown.png

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Game is run on dedicated server at my home network, however I've tried different routers without any successful results

chrome bay Apr 5, 2019, 3:22 PM

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@humble comet character movement is quite pricey, but to be honest 1.5kbp/s is really not a lot

#

Otherwise, keep the net frequency of your actors as low as possible

humble comet Apr 5, 2019, 3:23 PM

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@chrome bay max seen accross devices was 2.2kb/s as on screenshot

chrome bay Apr 5, 2019, 3:23 PM

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Use ForceNetUpdate when changing properties. Useful for actors which don't change regularly

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I think 95% of our replicated objects in HLL have a net update frequency of 1

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default is 100

humble comet Apr 5, 2019, 3:24 PM

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current is default 100, what numbers should I aim

jolly siren Apr 5, 2019, 3:25 PM

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Same here, I go with 1 a lot and just use ForceNetUpdate

chrome bay Apr 5, 2019, 3:25 PM

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We also use proxy replication sometimes, e.g. only sending 30 player states at once

jolly siren Apr 5, 2019, 3:25 PM

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Event based instead of having the server spin it's tires

chrome bay Apr 5, 2019, 3:25 PM

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only for special cases though

#

yeah

#

even 2.2kbps isn't high though

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at least I don't think so anyway

jolly siren Apr 5, 2019, 3:26 PM

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yeah it's low

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But it's mobile too

humble comet Apr 5, 2019, 3:26 PM

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I've cooked same game for pc, and have played with my friends, there are no noticeable lags, but movement was little bit jittery though

jolly siren Apr 5, 2019, 3:27 PM

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Have you worked with LAN James? I've ran into an issue when using ForceNetUpdate and NetUpdateFreq of 1 with it. For some reason things are delayed with LAN listen servers. It's strange and haven't figure it out yet.

chrome bay Apr 5, 2019, 3:27 PM

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I suspect packet loss is probably high on mobile

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especially on wifi

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@jolly siren not much LAN experience with it so far!

humble comet Apr 5, 2019, 3:27 PM

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so should i test it on some online server?

jolly siren Apr 5, 2019, 3:28 PM

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okay, I'm sure I'll figure it out

void nest Apr 5, 2019, 4:16 PM

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How can I check if an actor spawned on the server is ready and spawned on the connected clients? Basically I'm sending a reference of a newly spawned actor from server to clients using multicast, but the reference returns invalid because the actor is not yet created on the clients when the multicast is called from server. Adding a delay fixes the issue but is of course not a reliable option. How can I do this in a better way?

chrome bay Apr 5, 2019, 4:17 PM

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You can't really. You can never guarantee any actor is valid on the client at any time

#

What are you trying to achieve with it?

void nest Apr 5, 2019, 4:19 PM

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I'm spawning a child mesh in an actor. I want all of the replicated copies of the parent actor to hold a valid reference to the child after the server has spawned it.

chrome bay Apr 5, 2019, 4:19 PM

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Then the parent actor should just hold the reference as a replicated var

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Not have it set via a Multicast

void nest Apr 5, 2019, 4:20 PM

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Aha, I haven't thought of that

#

that sounds stupidly simple

chrome bay Apr 5, 2019, 4:20 PM

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You still can't guarantee that the child will be valid before the parent has replicated that change

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but reflection will match up the pointer when the child replicates

void nest Apr 5, 2019, 4:20 PM

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yeah but that's not really an issue, as the code that requires the child reference is never executed shortly after the child's creation

chrome bay Apr 5, 2019, 4:21 PM

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So the parent may resolve to a nullptr on the client initially, but it will be corrected once the child is created

void nest Apr 5, 2019, 4:21 PM

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and with an invalid check the worst that can happen is that the code doesn't fire

#

which is just a cosmetic effect

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so not an issue really

chrome bay Apr 5, 2019, 4:21 PM

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GG

void nest Apr 5, 2019, 4:21 PM

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Thanks! 😃

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works perfectly! 😉

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why didn't I think of that haha

chrome bay Apr 5, 2019, 4:25 PM

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simplest approach is sometimes the best 😄

void nest Apr 5, 2019, 4:25 PM

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Yeah but sometimes I overthink the issues way too much 😂

jolly siren Apr 5, 2019, 5:20 PM

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Hmm I wonder if that fudge factor was actually for interpolation delay

#

Anyone know how to calculate CMC interpolation delay?

winged badger Apr 5, 2019, 6:50 PM

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@humble comet your first step is to determine when does the movement feel jittery, server, client, does client see other clients smoothly, and only his pawn jittering (most likely case, CMC autocorrecting your movement, but can be something as simple as you setting and replicating rotation to server, then replicating it back to the owning client because you did not use SkipOwner replication condition)

timber anchor Apr 5, 2019, 7:51 PM

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📎 unknown.png

#

Guys how can i understand which function is braking the server?

graceful cave Apr 5, 2019, 8:05 PM

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if i use SpawnActorDeferred() and set an OnRep variable before finalizing the spawn, will the OnRep function trigger?

timber anchor Apr 5, 2019, 8:51 PM

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@graceful cave Wait, were you talking with me?

jolly siren Apr 5, 2019, 8:53 PM

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@graceful cave no

hallow turtle Apr 5, 2019, 8:53 PM

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Thats good to know

humble comet Apr 5, 2019, 9:12 PM

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Yeah I only call from server

#

But what about basic movement snapping

humble comet Apr 5, 2019, 9:52 PM

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listen server was roughly showing the same issues

twin juniper Apr 5, 2019, 9:53 PM

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Ik i dont know crap bout mp but recommendations on best hosts for game servers for my games mp

#

Self hosted cloud etc

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Dedicated

hallow turtle Apr 5, 2019, 10:00 PM

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@humble comet its a tough issue - if you do it from the server, then all get launched with the same impluse vector and server will issue movement corrections as they fly (as clients say the aren't where server wants). However.... there is going to be a startup lag. If you can gameplay-wise cover that up with a launch particle or windup - then you can hide the delay.

#

If you try and do it client launched then everyone's timing will be off and probably the launch vectors won't match. And if it is server auth for its movement - then you'll see tons of correction jitter.

humble comet Apr 5, 2019, 10:06 PM

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@hallow turtle so are you saying that I should stick with server launched version instead of multicast on all clients?

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I was hoping that launch character has lag compensation in it

hallow turtle Apr 5, 2019, 10:09 PM

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Unless it is something that you do a tearaway on (aka: Fire and forget) then server launched would be generally the way to go.

humble comet Apr 5, 2019, 10:10 PM

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ps my current setup uses only server calls of launch

hallow turtle Apr 5, 2019, 10:10 PM

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If it was for something like - "Launch this ball into space - but it doesn't affect gameplay" - then multicast of "Apply this vector to this ball" would be good.

grizzled stirrup Apr 6, 2019, 12:36 AM

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If you have a repnotify int for rolling in a direction (0,1,2,3 are different directions), in the OnRep function should you set the int to -1 after the rolling montage since if it isn't set to something new and the person rolls in the same direction, the OnRep will never be called?

jolly siren Apr 6, 2019, 3:13 AM

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yeah that's fine kyle

unreal pine Apr 6, 2019, 3:16 AM

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I'm calling the same function on a bullet kill as I call from a melee kill, only thing that changes is launch velocity (for the dying character) but for some reason the server and client don't match only on a melee kill
https://gfycat.com/pinkeasygoingbrocketdeer
Looks like the client teleports the dying player out into the ether for whatever reason. It also looks like the ragdoll might not be working also.

Gfycat

Desktop 2019.04.03 - 20.10.01.01 1

▶ Play video

#

it's weird that it would work differently for a melee kill vs bullet kill because it's all the same logic up until the part where it decides which direction the body flies

unreal pine Apr 6, 2019, 3:42 AM

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okay - closer to a solution for this ^^
When I don't multicast the "KillCharacter" event, the bullet death happens the same way

gusty lily Apr 6, 2019, 6:49 AM

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i've spent two days trying to make a working, replicating cosmetic beam for a LG (lightning gun, lazer) style weapon in an fps. for the life of me i cannt get it to work in all situations at once. how would others approach this i wonder?

winged badger Apr 6, 2019, 9:24 AM

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@gusty lily you don't replicate the cosmetics, you simulate them

gusty lily Apr 6, 2019, 9:25 AM

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right. so mirror things for player, server and other players separately. sounds good. any good resource for that?

winged badger Apr 6, 2019, 9:26 AM

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each client should run its own logic for all cosmetics

#

independently

#

you won't find a tutorial for anything so specific

#

@unreal pine you sure your instigator is good there?

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on the client

gusty lily Apr 6, 2019, 9:46 AM

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cheers

olive pawn Apr 6, 2019, 11:25 AM

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I'm stuck trying to get some custom movement abilities to replicate correctly, if someone is willing to have an extended PM convo with me to help me learn how this stuff is meant to work, it would be greatly appreciated

tropic fjord Apr 6, 2019, 11:37 AM

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Has anyone ever had an issue where they were using a Multicast and the Input on the function was null when called on the Client? It's there on the Server, but need it on Client cuz passing it into UI-related stuff.
No idea what I'm doing wrong, lol

north swan Apr 6, 2019, 12:58 PM

#

hello again, quick question:
CopyProperties() in the PlayerState. Does it only get called on seamlessTravel?

#

side question: Is there a way to browse ue4 source quickly outside of my IDE? somewhere online?

#

the API doc only lists function names and parameters iirc

worthy perch Apr 6, 2019, 12:59 PM

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Github.

north swan Apr 6, 2019, 12:59 PM

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oh yeah, I'll try that, thanks

jolly siren Apr 6, 2019, 1:00 PM

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It gets called on seamless travel and disconnection

#

Are you asking if it gets called for nonseamless travel?

north swan Apr 6, 2019, 1:01 PM

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nah, disconnection was what I was looking for. I can't UE_LOG something in my overridden function though

jolly siren Apr 6, 2019, 1:02 PM

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Yeah I already said that it did yesterday

#

And why can't you log?

north swan Apr 6, 2019, 1:03 PM

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i'm not sure yet

#

it just doesn't print the message

#

like the function doesnt get called

#

but if it does like you say, I'mprobably missing something else

jolly siren Apr 6, 2019, 1:05 PM

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It does, like i say 😛

north swan Apr 6, 2019, 1:05 PM

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yeah I trust you guys 100% 😄

#

forgot that you told me yesterday, sorry

jolly siren Apr 6, 2019, 1:05 PM

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np

unreal pine Apr 6, 2019, 1:07 PM

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sorry @winged badger I went to sleep 😄 Which instigator are you referring to here?

winged badger Apr 6, 2019, 1:08 PM

#

there was an instigator for melee in that blueprint event

#

if that is not valid on client, its forward vector can be any kind of junk value

jolly siren Apr 6, 2019, 1:09 PM

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@north swan CopyProperties gets called server side only. Just a fyi

unreal pine Apr 6, 2019, 1:09 PM

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ah yeah, right... it's good. he always moves in the proper direction, but not before getting teleported on the client

north swan Apr 6, 2019, 1:09 PM

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okay thanks

#

it just doesn't print.

📎 unknown.png

#

📎 unknown.png

#

sorry that's probably for another channel

jolly siren Apr 6, 2019, 1:27 PM

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That looks fine. It should log to your visual studio console

north swan Apr 6, 2019, 1:30 PM

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unfortunately it doesn't

north swan Apr 6, 2019, 1:52 PM

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it doesn't even hit the break point I set in the original APlayerState::CopyProperties()

winged badger Apr 6, 2019, 2:17 PM

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with what binaries @north swan ?

grizzled stirrup Apr 6, 2019, 2:21 PM

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Does anyone have any fixes to this issue? https://forums.unrealengine.com/unreal-engine/feedback-for-epic/1346282-impossible-use-ue4-for-a-coop-or-mp-listen-server-game-due-the-unfixed-network-errors-since-4-years

Unreal Engine Forums

Take me about one week to find out the problem that I see the clients in my game with teleporting/lag/jitter error. No one know or have clue and there is no docs

#

Listen server client sees the host moving smooth, listen server host sees client choppy even though both are smooth on dedicated server

#

@balmy gazelle Since this is your thread and is a bit old, did you find any solutions?

north swan Apr 6, 2019, 2:22 PM

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@winged badger both binaries in C:\UnrealProjects\PROJECTNAME\Binaries\Win64 and running via command line with -server argument dont work

winged badger Apr 6, 2019, 2:23 PM

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editor binaries or not*?

north swan Apr 6, 2019, 2:25 PM

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sorry i'm not exactly sure what you mean (my fault).
I'm using a source built ue4 version 4.21. Development Editor/Development Server for project

winged badger Apr 6, 2019, 2:26 PM

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dev editor can catch the breakpoint in the engine code

#

and CopyProperties runs every time you change the map

north swan Apr 6, 2019, 2:26 PM

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I was told it also runs when disconnecting from the server

#

maybe I misunderstood

winged badger Apr 6, 2019, 2:27 PM

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if that includes changing the level, sure

#

like going to main manu, which is on a different level

north swan Apr 6, 2019, 2:27 PM

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oh maybe it was that, I gotta check

winged badger Apr 6, 2019, 2:28 PM

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if you do not change the level, there is no reason for PlayerState to be reinitialized

#

and so, it won't call CopyProperties

north swan Apr 6, 2019, 2:29 PM

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so it wont get called when I type disconnect in the client console or simply alt-f4

#

right?

winged badger Apr 6, 2019, 2:29 PM

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probably not, i don't see a reason to

north swan Apr 6, 2019, 2:30 PM

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okay thanks, guess I misunderstood then. 😬 👍

main spindle Apr 6, 2019, 2:34 PM

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what5 does "if owning client" mean?

#

ok why can't my client use the Execute on server thingy?

#

the function doesn't go thru

jolly siren Apr 6, 2019, 2:58 PM

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What actor are you calling the server rpc from?

main spindle Apr 6, 2019, 2:59 PM

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my pawn

#

ah shit I may have realised what it is

#

One sec lemme try something

#

nope still aint working

#

donno what it is

grizzled stirrup Apr 6, 2019, 3:07 PM

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You have to make sure that the actor you are calling the server RPC on has the correct ownership

#

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

main spindle Apr 6, 2019, 3:07 PM

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how do I do that then

grizzled stirrup Apr 6, 2019, 3:07 PM

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Page 60 explains it

main spindle Apr 6, 2019, 3:07 PM

#

thanks

grizzled stirrup Apr 6, 2019, 3:08 PM

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Np

main spindle Apr 6, 2019, 3:20 PM

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yeah no I don't get it

grizzled stirrup Apr 6, 2019, 3:21 PM

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If the object is owned by the server (not your player controller), then you can't call a server RPC on it

#

If it's owned by your player controller (like a character and therefore a gun that is owned by the character) you can call the rpc

main spindle Apr 6, 2019, 3:22 PM

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It's not owned by the server, it should be owned by a pawn

#

📎 unknown.png

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This is inside my main pawn

#

it shows AUTHORITY when pressed on server and NOT when pressed on client, but the funciton doesn't go rhough on client